diff options
Diffstat (limited to 'security/tomoyo')
| -rw-r--r-- | security/tomoyo/Kconfig | 11 | ||||
| -rw-r--r-- | security/tomoyo/Makefile | 1 | ||||
| -rw-r--r-- | security/tomoyo/common.c | 2206 | ||||
| -rw-r--r-- | security/tomoyo/common.h | 359 | ||||
| -rw-r--r-- | security/tomoyo/domain.c | 878 | ||||
| -rw-r--r-- | security/tomoyo/file.c | 1241 | ||||
| -rw-r--r-- | security/tomoyo/realpath.c | 482 | ||||
| -rw-r--r-- | security/tomoyo/realpath.h | 66 | ||||
| -rw-r--r-- | security/tomoyo/tomoyo.c | 294 | ||||
| -rw-r--r-- | security/tomoyo/tomoyo.h | 106 |
10 files changed, 5644 insertions, 0 deletions
diff --git a/security/tomoyo/Kconfig b/security/tomoyo/Kconfig new file mode 100644 index 0000000..c8f3857 --- /dev/null +++ b/security/tomoyo/Kconfig @@ -0,0 +1,11 @@ +config SECURITY_TOMOYO + bool "TOMOYO Linux Support" + depends on SECURITY + select SECURITYFS + select SECURITY_PATH + default n + help + This selects TOMOYO Linux, pathname-based access control. + Required userspace tools and further information may be + found at <http://tomoyo.sourceforge.jp/>. + If you are unsure how to answer this question, answer N. diff --git a/security/tomoyo/Makefile b/security/tomoyo/Makefile new file mode 100644 index 0000000..10ccd68 --- /dev/null +++ b/security/tomoyo/Makefile @@ -0,0 +1 @@ +obj-y = common.o realpath.o tomoyo.o domain.o file.o diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c new file mode 100644 index 0000000..92cea65 --- /dev/null +++ b/security/tomoyo/common.c @@ -0,0 +1,2206 @@ +/* + * security/tomoyo/common.c + * + * Common functions for TOMOYO. + * + * Copyright (C) 2005-2009 NTT DATA CORPORATION + * + * Version: 2.2.0-pre 2009/02/01 + * + */ + +#include <linux/uaccess.h> +#include <linux/security.h> +#include <linux/hardirq.h> +#include "realpath.h" +#include "common.h" +#include "tomoyo.h" + +/* Has loading policy done? */ +bool tomoyo_policy_loaded; + +/* String table for functionality that takes 4 modes. */ +static const char *tomoyo_mode_4[4] = { + "disabled", "learning", "permissive", "enforcing" +}; +/* String table for functionality that takes 2 modes. */ +static const char *tomoyo_mode_2[4] = { + "disabled", "enabled", "enabled", "enabled" +}; + +/* Table for profile. */ +static struct { + const char *keyword; + unsigned int current_value; + const unsigned int max_value; +} tomoyo_control_array[TOMOYO_MAX_CONTROL_INDEX] = { + [TOMOYO_MAC_FOR_FILE] = { "MAC_FOR_FILE", 0, 3 }, + [TOMOYO_MAX_ACCEPT_ENTRY] = { "MAX_ACCEPT_ENTRY", 2048, INT_MAX }, + [TOMOYO_VERBOSE] = { "TOMOYO_VERBOSE", 1, 1 }, +}; + +/* Profile table. Memory is allocated as needed. */ +static struct tomoyo_profile { + unsigned int value[TOMOYO_MAX_CONTROL_INDEX]; + const struct tomoyo_path_info *comment; +} *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES]; + +/* Permit policy management by non-root user? */ +static bool tomoyo_manage_by_non_root; + +/* Utility functions. */ + +/* Open operation for /sys/kernel/security/tomoyo/ interface. */ +static int tomoyo_open_control(const u8 type, struct file *file); +/* Close /sys/kernel/security/tomoyo/ interface. */ +static int tomoyo_close_control(struct file *file); +/* Read operation for /sys/kernel/security/tomoyo/ interface. */ +static int tomoyo_read_control(struct file *file, char __user *buffer, + const int buffer_len); +/* Write operation for /sys/kernel/security/tomoyo/ interface. */ +static int tomoyo_write_control(struct file *file, const char __user *buffer, + const int buffer_len); + +/** + * tomoyo_is_byte_range - Check whether the string isa \ooo style octal value. + * + * @str: Pointer to the string. + * + * Returns true if @str is a \ooo style octal value, false otherwise. + * + * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF. + * This function verifies that \ooo is in valid range. + */ +static inline bool tomoyo_is_byte_range(const char *str) +{ + return *str >= '0' && *str++ <= '3' && + *str >= '0' && *str++ <= '7' && + *str >= '0' && *str <= '7'; +} + +/** + * tomoyo_is_alphabet_char - Check whether the character is an alphabet. + * + * @c: The character to check. + * + * Returns true if @c is an alphabet character, false otherwise. + */ +static inline bool tomoyo_is_alphabet_char(const char c) +{ + return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'); +} + +/** + * tomoyo_make_byte - Make byte value from three octal characters. + * + * @c1: The first character. + * @c2: The second character. + * @c3: The third character. + * + * Returns byte value. + */ +static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3) +{ + return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0'); +} + +/** + * tomoyo_str_starts - Check whether the given string starts with the given keyword. + * + * @src: Pointer to pointer to the string. + * @find: Pointer to the keyword. + * + * Returns true if @src starts with @find, false otherwise. + * + * The @src is updated to point the first character after the @find + * if @src starts with @find. + */ +static bool tomoyo_str_starts(char **src, const char *find) +{ + const int len = strlen(find); + char *tmp = *src; + + if (strncmp(tmp, find, len)) + return false; + tmp += len; + *src = tmp; + return true; +} + +/** + * tomoyo_normalize_line - Format string. + * + * @buffer: The line to normalize. + * + * Leading and trailing whitespaces are removed. + * Multiple whitespaces are packed into single space. + * + * Returns nothing. + */ +static void tomoyo_normalize_line(unsigned char *buffer) +{ + unsigned char *sp = buffer; + unsigned char *dp = buffer; + bool first = true; + + while (tomoyo_is_invalid(*sp)) + sp++; + while (*sp) { + if (!first) + *dp++ = ' '; + first = false; + while (tomoyo_is_valid(*sp)) + *dp++ = *sp++; + while (tomoyo_is_invalid(*sp)) + sp++; + } + *dp = '\0'; +} + +/** + * tomoyo_is_correct_path - Validate a pathname. + * @filename: The pathname to check. + * @start_type: Should the pathname start with '/'? + * 1 = must / -1 = must not / 0 = don't care + * @pattern_type: Can the pathname contain a wildcard? + * 1 = must / -1 = must not / 0 = don't care + * @end_type: Should the pathname end with '/'? + * 1 = must / -1 = must not / 0 = don't care + * @function: The name of function calling me. + * + * Check whether the given filename follows the naming rules. + * Returns true if @filename follows the naming rules, false otherwise. + */ +bool tomoyo_is_correct_path(const char *filename, const s8 start_type, + const s8 pattern_type, const s8 end_type, + const char *function) +{ + bool contains_pattern = false; + unsigned char c; + unsigned char d; + unsigned char e; + const char *original_filename = filename; + + if (!filename) + goto out; + c = *filename; + if (start_type == 1) { /* Must start with '/' */ + if (c != '/') + goto out; + } else if (start_type == -1) { /* Must not start with '/' */ + if (c == '/') + goto out; + } + if (c) + c = *(filename + strlen(filename) - 1); + if (end_type == 1) { /* Must end with '/' */ + if (c != '/') + goto out; + } else if (end_type == -1) { /* Must not end with '/' */ + if (c == '/') + goto out; + } + while ((c = *filename++) != '\0') { + if (c == '\\') { + switch ((c = *filename++)) { + case '\\': /* "\\" */ + continue; + case '$': /* "\$" */ + case '+': /* "\+" */ + case '?': /* "\?" */ + case '*': /* "\*" */ + case '@': /* "\@" */ + case 'x': /* "\x" */ + case 'X': /* "\X" */ + case 'a': /* "\a" */ + case 'A': /* "\A" */ + case '-': /* "\-" */ + if (pattern_type == -1) + break; /* Must not contain pattern */ + contains_pattern = true; + continue; + case '0': /* "\ooo" */ + case '1': + case '2': + case '3': + d = *filename++; + if (d < '0' || d > '7') + break; + e = *filename++; + if (e < '0' || e > '7') + break; + c = tomoyo_make_byte(c, d, e); + if (tomoyo_is_invalid(c)) + continue; /* pattern is not \000 */ + } + goto out; + } else if (tomoyo_is_invalid(c)) { + goto out; + } + } + if (pattern_type == 1) { /* Must contain pattern */ + if (!contains_pattern) + goto out; + } + return true; + out: + printk(KERN_DEBUG "%s: Invalid pathname '%s'\n", function, + original_filename); + return false; +} + +/** + * tomoyo_is_correct_domain - Check whether the given domainname follows the naming rules. + * @domainname: The domainname to check. + * @function: The name of function calling me. + * + * Returns true if @domainname follows the naming rules, false otherwise. + */ +bool tomoyo_is_correct_domain(const unsigned char *domainname, + const char *function) +{ + unsigned char c; + unsigned char d; + unsigned char e; + const char *org_domainname = domainname; + + if (!domainname || strncmp(domainname, TOMOYO_ROOT_NAME, + TOMOYO_ROOT_NAME_LEN)) + goto out; + domainname += TOMOYO_ROOT_NAME_LEN; + if (!*domainname) + return true; + do { + if (*domainname++ != ' ') + goto out; + if (*domainname++ != '/') + goto out; + while ((c = *domainname) != '\0' && c != ' ') { + domainname++; + if (c == '\\') { + c = *domainname++; + switch ((c)) { + case '\\': /* "\\" */ + continue; + case '0': /* "\ooo" */ + case '1': + case '2': + case '3': + d = *domainname++; + if (d < '0' || d > '7') + break; + e = *domainname++; + if (e < '0' || e > '7') + break; + c = tomoyo_make_byte(c, d, e); + if (tomoyo_is_invalid(c)) + /* pattern is not \000 */ + continue; + } + goto out; + } else if (tomoyo_is_invalid(c)) { + goto out; + } + } + } while (*domainname); + return true; + out: + printk(KERN_DEBUG "%s: Invalid domainname '%s'\n", function, + org_domainname); + return false; +} + +/** + * tomoyo_is_domain_def - Check whether the given token can be a domainname. + * + * @buffer: The token to check. + * + * Returns true if @buffer possibly be a domainname, false otherwise. + */ +bool tomoyo_is_domain_def(const unsigned char *buffer) +{ + return !strncmp(buffer, TOMOYO_ROOT_NAME, TOMOYO_ROOT_NAME_LEN); +} + +/** + * tomoyo_find_domain - Find a domain by the given name. + * + * @domainname: The domainname to find. + * + * Caller must call down_read(&tomoyo_domain_list_lock); or + * down_write(&tomoyo_domain_list_lock); . + * + * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise. + */ +struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname) +{ + struct tomoyo_domain_info *domain; + struct tomoyo_path_info name; + + name.name = domainname; + tomoyo_fill_path_info(&name); + list_for_each_entry(domain, &tomoyo_domain_list, list) { + if (!domain->is_deleted && + !tomoyo_pathcmp(&name, domain->domainname)) + return domain; + } + return NULL; +} + +/** + * tomoyo_path_depth - Evaluate the number of '/' in a string. + * + * @pathname: The string to evaluate. + * + * Returns path depth of the string. + * + * I score 2 for each of the '/' in the @pathname + * and score 1 if the @pathname ends with '/'. + */ +static int tomoyo_path_depth(const char *pathname) +{ + int i = 0; + + if (pathname) { + const char *ep = pathname + strlen(pathname); + if (pathname < ep--) { + if (*ep != '/') + i++; + while (pathname <= ep) + if (*ep-- == '/') + i += 2; + } + } + return i; +} + +/** + * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token. + * + * @filename: The string to evaluate. + * + * Returns the initial length without a pattern in @filename. + */ +static int tomoyo_const_part_length(const char *filename) +{ + char c; + int len = 0; + + if (!filename) + return 0; + while ((c = *filename++) != '\0') { + if (c != '\\') { + len++; + continue; + } + c = *filename++; + switch (c) { + case '\\': /* "\\" */ + len += 2; + continue; + case '0': /* "\ooo" */ + case '1': + case '2': + case '3': + c = *filename++; + if (c < '0' || c > '7') + break; + c = *filename++; + if (c < '0' || c > '7') + break; + len += 4; + continue; + } + break; + } + return len; +} + +/** + * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members. + * + * @ptr: Pointer to "struct tomoyo_path_info" to fill in. + * + * The caller sets "struct tomoyo_path_info"->name. + */ +void tomoyo_fill_path_info(struct tomoyo_path_info *ptr) +{ + const char *name = ptr->name; + const int len = strlen(name); + + ptr->total_len = len; + ptr->const_len = tomoyo_const_part_length(name); + ptr->is_dir = len && (name[len - 1] == '/'); + ptr->is_patterned = (ptr->const_len < len); + ptr->hash = full_name_hash(name, len); + ptr->depth = tomoyo_path_depth(name); +} + +/** + * tomoyo_file_matches_to_pattern2 - Pattern matching without '/' character + * and "\-" pattern. + * + * @filename: The start of string to check. + * @filename_end: The end of string to check. + * @pattern: The start of pattern to compare. + * @pattern_end: The end of pattern to compare. + * + * Returns true if @filename matches @pattern, false otherwise. + */ +static bool tomoyo_file_matches_to_pattern2(const char *filename, + const char *filename_end, + const char *pattern, + const char *pattern_end) +{ + while (filename < filename_end && pattern < pattern_end) { + char c; + if (*pattern != '\\') { + if (*filename++ != *pattern++) + return false; + continue; + } + c = *filename; + pattern++; + switch (*pattern) { + int i; + int j; + case '?': + if (c == '/') { + return false; + } else if (c == '\\') { + if (filename[1] == '\\') + filename++; + else if (tomoyo_is_byte_range(filename + 1)) + filename += 3; + else + return false; + } + break; + case '\\': + if (c != '\\') + return false; + if (*++filename != '\\') + return false; + break; + case '+': + if (!isdigit(c)) + return false; + break; + case 'x': + if (!isxdigit(c)) + return false; + break; + case 'a': + if (!tomoyo_is_alphabet_char(c)) + return false; + break; + case '0': + case '1': + case '2': + case '3': + if (c == '\\' && tomoyo_is_byte_range(filename + 1) + && strncmp(filename + 1, pattern, 3) == 0) { + filename += 3; + pattern += 2; + break; + } + return false; /* Not matched. */ + case '*': + case '@': + for (i = 0; i <= filename_end - filename; i++) { + if (tomoyo_file_matches_to_pattern2( + filename + i, filename_end, + pattern + 1, pattern_end)) + return true; + c = filename[i]; + if (c == '.' && *pattern == '@') + break; + if (c != '\\') + continue; + if (filename[i + 1] == '\\') + i++; + else if (tomoyo_is_byte_range(filename + i + 1)) + i += 3; + else + break; /* Bad pattern. */ + } + return false; /* Not matched. */ + default: + j = 0; + c = *pattern; + if (c == '$') { + while (isdigit(filename[j])) + j++; + } else if (c == 'X') { + while (isxdigit(filename[j])) + j++; + } else if (c == 'A') { + while (tomoyo_is_alphabet_char(filename[j])) + j++; + } + for (i = 1; i <= j; i++) { + if (tomoyo_file_matches_to_pattern2( + filename + i, filename_end, + pattern + 1, pattern_end)) + return true; + } + return false; /* Not matched or bad pattern. */ + } + filename++; + pattern++; + } + while (*pattern == '\\' && + (*(pattern + 1) == '*' || *(pattern + 1) == '@')) + pattern += 2; + return filename == filename_end && pattern == pattern_end; +} + +/** + * tomoyo_file_matches_to_pattern - Pattern matching without without '/' character. + * + * @filename: The start of string to check. + * @filename_end: The end of string to check. + * @pattern: The start of pattern to compare. + * @pattern_end: The end of pattern to compare. + * + * Returns true if @filename matches @pattern, false otherwise. + */ +static bool tomoyo_file_matches_to_pattern(const char *filename, + const char *filename_end, + const char *pattern, + const char *pattern_end) +{ + const char *pattern_start = pattern; + bool first = true; + bool result; + + while (pattern < pattern_end - 1) { + /* Split at "\-" pattern. */ + if (*pattern++ != '\\' || *pattern++ != '-') + continue; + result = tomoyo_file_matches_to_pattern2(filename, + filename_end, + pattern_start, + pattern - 2); + if (first) + result = !result; + if (result) + return false; + first = false; + pattern_start = pattern; + } + result = tomoyo_file_matches_to_pattern2(filename, filename_end, + pattern_start, pattern_end); + return first ? result : !result; +} + +/** + * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern. + * @filename: The filename to check. + * @pattern: The pattern to compare. + * + * Returns true if matches, false otherwise. + * + * The following patterns are available. + * \\ \ itself. + * \ooo Octal representation of a byte. + * \* More than or equals to 0 character other than '/'. + * \@ More than or equals to 0 character other than '/' or '.'. + * \? 1 byte character other than '/'. + * \$ More than or equals to 1 decimal digit. + * \+ 1 decimal digit. + * \X More than or equals to 1 hexadecimal digit. + * \x 1 hexadecimal digit. + * \A More than or equals to 1 alphabet character. + * \a 1 alphabet character. + * \- Subtraction operator. + */ +bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename, + const struct tomoyo_path_info *pattern) +{ + /* + if (!filename || !pattern) + return false; + */ + const char *f = filename->name; + const char *p = pattern->name; + const int len = pattern->const_len; + + /* If @pattern doesn't contain pattern, I can use strcmp(). */ + if (!pattern->is_patterned) + return !tomoyo_pathcmp(filename, pattern); + /* Dont compare if the number of '/' differs. */ + if (filename->depth != pattern->depth) + return false; + /* Compare the initial length without patterns. */ + if (strncmp(f, p, len)) + return false; + f += len; + p += len; + /* Main loop. Compare each directory component. */ + while (*f && *p) { + const char *f_delimiter = strchr(f, '/'); + const char *p_delimiter = strchr(p, '/'); + if (!f_delimiter) + f_delimiter = f + strlen(f); + if (!p_delimiter) + p_delimiter = p + strlen(p); + if (!tomoyo_file_matches_to_pattern(f, f_delimiter, + p, p_delimiter)) + return false; + f = f_delimiter; + if (*f) + f++; + p = p_delimiter; + if (*p) + p++; + } + /* Ignore trailing "\*" and "\@" in @pattern. */ + while (*p == '\\' && + (*(p + 1) == '*' || *(p + 1) == '@')) + p += 2; + return !*f && !*p; +} + +/** + * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * @fmt: The printf()'s format string, followed by parameters. + * + * Returns true if output was written, false otherwise. + * + * The snprintf() will truncate, but tomoyo_io_printf() won't. + */ +bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...) +{ + va_list args; + int len; + int pos = head->read_avail; + int size = head->readbuf_size - pos; + + if (size <= 0) + return false; + va_start(args, fmt); + len = vsnprintf(head->read_buf + pos, size, fmt, args); + va_end(args); + if (pos + len >= head->readbuf_size) + return false; + head->read_avail += len; + return true; +} + +/** + * tomoyo_get_exe - Get tomoyo_realpath() of current process. + * + * Returns the tomoyo_realpath() of current process on success, NULL otherwise. + * + * This function uses tomoyo_alloc(), so the caller must call tomoyo_free() + * if this function didn't return NULL. + */ +static const char *tomoyo_get_exe(void) +{ + struct mm_struct *mm = current->mm; + struct vm_area_struct *vma; + const char *cp = NULL; + + if (!mm) + return NULL; + down_read(&mm->mmap_sem); + for (vma = mm->mmap; vma; vma = vma->vm_next) { + if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) { + cp = tomoyo_realpath_from_path(&vma->vm_file->f_path); + break; + } + } + up_read(&mm->mmap_sem); + return cp; +} + +/** + * tomoyo_get_msg - Get warning message. + * + * @is_enforce: Is it enforcing mode? + * + * Returns "ERROR" or "WARNING". + */ +const char *tomoyo_get_msg(const bool is_enforce) +{ + if (is_enforce) + return "ERROR"; + else + return "WARNING"; +} + +/** + * tomoyo_check_flags - Check mode for specified functionality. + * + * @domain: Pointer to "struct tomoyo_domain_info". + * @index: The functionality to check mode. + * + * TOMOYO checks only process context. + * This code disables TOMOYO's enforcement in case the function is called from + * interrupt context. + */ +unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain, + const u8 index) +{ + const u8 profile = domain->profile; + + if (WARN_ON(in_interrupt())) + return 0; + return tomoyo_policy_loaded && index < TOMOYO_MAX_CONTROL_INDEX +#if TOMOYO_MAX_PROFILES != 256 + && profile < TOMOYO_MAX_PROFILES +#endif + && tomoyo_profile_ptr[profile] ? + tomoyo_profile_ptr[profile]->value[index] : 0; +} + +/** + * tomoyo_verbose_mode - Check whether TOMOYO is verbose mode. + * + * @domain: Pointer to "struct tomoyo_domain_info". + * + * Returns true if domain policy violation warning should be printed to + * console. + */ +bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain) +{ + return tomoyo_check_flags(domain, TOMOYO_VERBOSE) != 0; +} + +/** + * tomoyo_domain_quota_is_ok - Check for domain's quota. + * + * @domain: Pointer to "struct tomoyo_domain_info". + * + * Returns true if the domain is not exceeded quota, false otherwise. + */ +bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain) +{ + unsigned int count = 0; + struct tomoyo_acl_info *ptr; + + if (!domain) + return true; + down_read(&tomoyo_domain_acl_info_list_lock); + list_for_each_entry(ptr, &domain->acl_info_list, list) { + if (ptr->type & TOMOYO_ACL_DELETED) + continue; + switch (tomoyo_acl_type2(ptr)) { + struct tomoyo_single_path_acl_record *acl1; + struct tomoyo_double_path_acl_record *acl2; + u16 perm; + case TOMOYO_TYPE_SINGLE_PATH_ACL: + acl1 = container_of(ptr, + struct tomoyo_single_path_acl_record, + head); + perm = acl1->perm; + if (perm & (1 << TOMOYO_TYPE_EXECUTE_ACL)) + count++; + if (perm & + ((1 << TOMOYO_TYPE_READ_ACL) | + (1 << TOMOYO_TYPE_WRITE_ACL))) + count++; + if (perm & (1 << TOMOYO_TYPE_CREATE_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_UNLINK_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_MKDIR_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_RMDIR_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_MKFIFO_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_MKSOCK_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_MKBLOCK_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_MKCHAR_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_TRUNCATE_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_SYMLINK_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_REWRITE_ACL)) + count++; + break; + case TOMOYO_TYPE_DOUBLE_PATH_ACL: + acl2 = container_of(ptr, + struct tomoyo_double_path_acl_record, + head); + perm = acl2->perm; + if (perm & (1 << TOMOYO_TYPE_LINK_ACL)) + count++; + if (perm & (1 << TOMOYO_TYPE_RENAME_ACL)) + count++; + break; + } + } + up_read(&tomoyo_domain_acl_info_list_lock); + if (count < tomoyo_check_flags(domain, TOMOYO_MAX_ACCEPT_ENTRY)) + return true; + if (!domain->quota_warned) { + domain->quota_warned = true; + printk(KERN_WARNING "TOMOYO-WARNING: " + "Domain '%s' has so many ACLs to hold. " + "Stopped learning mode.\n", domain->domainname->name); + } + return false; +} + +/** + * tomoyo_find_or_assign_new_profile - Create a new profile. + * + * @profile: Profile number to create. + * + * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise. + */ +static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned + int profile) +{ + static DEFINE_MUTEX(lock); + struct tomoyo_profile *ptr = NULL; + int i; + + if (profile >= TOMOYO_MAX_PROFILES) + return NULL; + /***** EXCLUSIVE SECTION START *****/ + mutex_lock(&lock); + ptr = tomoyo_profile_ptr[profile]; + if (ptr) + goto ok; + ptr = tomoyo_alloc_element(sizeof(*ptr)); + if (!ptr) + goto ok; + for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++) + ptr->value[i] = tomoyo_control_array[i].current_value; + mb(); /* Avoid out-of-order execution. */ + tomoyo_profile_ptr[profile] = ptr; + ok: + mutex_unlock(&lock); + /***** EXCLUSIVE SECTION END *****/ + return ptr; +} + +/** + * tomoyo_write_profile - Write to profile table. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_write_profile(struct tomoyo_io_buffer *head) +{ + char *data = head->write_buf; + unsigned int i; + unsigned int value; + char *cp; + struct tomoyo_profile *profile; + unsigned long num; + + cp = strchr(data, '-'); + if (cp) + *cp = '\0'; + if (strict_strtoul(data, 10, &num)) + return -EINVAL; + if (cp) + data = cp + 1; + profile = tomoyo_find_or_assign_new_profile(num); + if (!profile) + return -EINVAL; + cp = strchr(data, '='); + if (!cp) + return -EINVAL; + *cp = '\0'; + if (!strcmp(data, "COMMENT")) { + profile->comment = tomoyo_save_name(cp + 1); + return 0; + } + for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++) { + if (strcmp(data, tomoyo_control_array[i].keyword)) + continue; + if (sscanf(cp + 1, "%u", &value) != 1) { + int j; + const char **modes; + switch (i) { + case TOMOYO_VERBOSE: + modes = tomoyo_mode_2; + break; + default: + modes = tomoyo_mode_4; + break; + } + for (j = 0; j < 4; j++) { + if (strcmp(cp + 1, modes[j])) + continue; + value = j; + break; + } + if (j == 4) + return -EINVAL; + } else if (value > tomoyo_control_array[i].max_value) { + value = tomoyo_control_array[i].max_value; + } + profile->value[i] = value; + return 0; + } + return -EINVAL; +} + +/** + * tomoyo_read_profile - Read from profile table. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0. + */ +static int tomoyo_read_profile(struct tomoyo_io_buffer *head) +{ + static const int total = TOMOYO_MAX_CONTROL_INDEX + 1; + int step; + + if (head->read_eof) + return 0; + for (step = head->read_step; step < TOMOYO_MAX_PROFILES * total; + step++) { + const u8 index = step / total; + u8 type = step % total; + const struct tomoyo_profile *profile + = tomoyo_profile_ptr[index]; + head->read_step = step; + if (!profile) + continue; + if (!type) { /* Print profile' comment tag. */ + if (!tomoyo_io_printf(head, "%u-COMMENT=%s\n", + index, profile->comment ? + profile->comment->name : "")) + break; + continue; + } + type--; + if (type < TOMOYO_MAX_CONTROL_INDEX) { + const unsigned int value = profile->value[type]; + const char **modes = NULL; + const char *keyword + = tomoyo_control_array[type].keyword; + switch (tomoyo_control_array[type].max_value) { + case 3: + modes = tomoyo_mode_4; + break; + case 1: + modes = tomoyo_mode_2; + break; + } + if (modes) { + if (!tomoyo_io_printf(head, "%u-%s=%s\n", index, + keyword, modes[value])) + break; + } else { + if (!tomoyo_io_printf(head, "%u-%s=%u\n", index, + keyword, value)) + break; + } + } + } + if (step == TOMOYO_MAX_PROFILES * total) + head->read_eof = true; + return 0; +} + +/* Structure for policy manager. */ +struct tomoyo_policy_manager_entry { + struct list_head list; + /* A path to program or a domainname. */ + const struct tomoyo_path_info *manager; + bool is_domain; /* True if manager is a domainname. */ + bool is_deleted; /* True if this entry is deleted. */ +}; + +/* The list for "struct tomoyo_policy_manager_entry". */ +static LIST_HEAD(tomoyo_policy_manager_list); +static DECLARE_RWSEM(tomoyo_policy_manager_list_lock); + +/** + * tomoyo_update_manager_entry - Add a manager entry. + * + * @manager: The path to manager or the domainnamme. + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_update_manager_entry(const char *manager, + const bool is_delete) +{ + struct tomoyo_policy_manager_entry *new_entry; + struct tomoyo_policy_manager_entry *ptr; + const struct tomoyo_path_info *saved_manager; + int error = -ENOMEM; + bool is_domain = false; + + if (tomoyo_is_domain_def(manager)) { + if (!tomoyo_is_correct_domain(manager, __func__)) + return -EINVAL; + is_domain = true; + } else { + if (!tomoyo_is_correct_path(manager, 1, -1, -1, __func__)) + return -EINVAL; + } + saved_manager = tomoyo_save_name(manager); + if (!saved_manager) + return -ENOMEM; + /***** EXCLUSIVE SECTION START *****/ + down_write(&tomoyo_policy_manager_list_lock); + list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) { + if (ptr->manager != saved_manager) + continue; + ptr->is_deleted = is_delete; + error = 0; + goto out; + } + if (is_delete) { + error = -ENOENT; + goto out; + } + new_entry = tomoyo_alloc_element(sizeof(*new_entry)); + if (!new_entry) + goto out; + new_entry->manager = saved_manager; + new_entry->is_domain = is_domain; + list_add_tail(&new_entry->list, &tomoyo_policy_manager_list); + error = 0; + out: + up_write(&tomoyo_policy_manager_list_lock); + /***** EXCLUSIVE SECTION END *****/ + return error; +} + +/** + * tomoyo_write_manager_policy - Write manager policy. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head) +{ + char *data = head->write_buf; + bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); + + if (!strcmp(data, "manage_by_non_root")) { + tomoyo_manage_by_non_root = !is_delete; + return 0; + } + return tomoyo_update_manager_entry(data, is_delete); +} + +/** + * tomoyo_read_manager_policy - Read manager policy. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0. + */ +static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head) +{ + struct list_head *pos; + bool done = true; + + if (head->read_eof) + return 0; + down_read(&tomoyo_policy_manager_list_lock); + list_for_each_cookie(pos, head->read_var2, + &tomoyo_policy_manager_list) { + struct tomoyo_policy_manager_entry *ptr; + ptr = list_entry(pos, struct tomoyo_policy_manager_entry, + list); + if (ptr->is_deleted) + continue; + if (!tomoyo_io_printf(head, "%s\n", ptr->manager->name)) { + done = false; + break; + } + } + up_read(&tomoyo_policy_manager_list_lock); + head->read_eof = done; + return 0; +} + +/** + * tomoyo_is_policy_manager - Check whether the current process is a policy manager. + * + * Returns true if the current process is permitted to modify policy + * via /sys/kernel/security/tomoyo/ interface. + */ +static bool tomoyo_is_policy_manager(void) +{ + struct tomoyo_policy_manager_entry *ptr; + const char *exe; + const struct task_struct *task = current; + const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname; + bool found = false; + + if (!tomoyo_policy_loaded) + return true; + if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid)) + return false; + down_read(&tomoyo_policy_manager_list_lock); + list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) { + if (!ptr->is_deleted && ptr->is_domain + && !tomoyo_pathcmp(domainname, ptr->manager)) { + found = true; + break; + } + } + up_read(&tomoyo_policy_manager_list_lock); + if (found) + return true; + exe = tomoyo_get_exe(); + if (!exe) + return false; + down_read(&tomoyo_policy_manager_list_lock); + list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) { + if (!ptr->is_deleted && !ptr->is_domain + && !strcmp(exe, ptr->manager->name)) { + found = true; + break; + } + } + up_read(&tomoyo_policy_manager_list_lock); + if (!found) { /* Reduce error messages. */ + static pid_t last_pid; + const pid_t pid = current->pid; + if (last_pid != pid) { + printk(KERN_WARNING "%s ( %s ) is not permitted to " + "update policies.\n", domainname->name, exe); + last_pid = pid; + } + } + tomoyo_free(exe); + return found; +} + +/** + * tomoyo_is_select_one - Parse select command. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * @data: String to parse. + * + * Returns true on success, false otherwise. + */ +static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head, + const char *data) +{ + unsigned int pid; + struct tomoyo_domain_info *domain = NULL; + + if (sscanf(data, "pid=%u", &pid) == 1) { + struct task_struct *p; + /***** CRITICAL SECTION START *****/ + read_lock(&tasklist_lock); + p = find_task_by_vpid(pid); + if (p) + domain = tomoyo_real_domain(p); + read_unlock(&tasklist_lock); + /***** CRITICAL SECTION END *****/ + } else if (!strncmp(data, "domain=", 7)) { + if (tomoyo_is_domain_def(data + 7)) { + down_read(&tomoyo_domain_list_lock); + domain = tomoyo_find_domain(data + 7); + up_read(&tomoyo_domain_list_lock); + } + } else + return false; + head->write_var1 = domain; + /* Accessing read_buf is safe because head->io_sem is held. */ + if (!head->read_buf) + return true; /* Do nothing if open(O_WRONLY). */ + head->read_avail = 0; + tomoyo_io_printf(head, "# select %s\n", data); + head->read_single_domain = true; + head->read_eof = !domain; + if (domain) { + struct tomoyo_domain_info *d; + head->read_var1 = NULL; + down_read(&tomoyo_domain_list_lock); + list_for_each_entry(d, &tomoyo_domain_list, list) { + if (d == domain) + break; + head->read_var1 = &d->list; + } + up_read(&tomoyo_domain_list_lock); + head->read_var2 = NULL; + head->read_bit = 0; + head->read_step = 0; + if (domain->is_deleted) + tomoyo_io_printf(head, "# This is a deleted domain.\n"); + } + return true; +} + +/** + * tomoyo_write_domain_policy - Write domain policy. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head) +{ + char *data = head->write_buf; + struct tomoyo_domain_info *domain = head->write_var1; + bool is_delete = false; + bool is_select = false; + bool is_undelete = false; + unsigned int profile; + + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE)) + is_delete = true; + else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT)) + is_select = true; + else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_UNDELETE)) + is_undelete = true; + if (is_select && tomoyo_is_select_one(head, data)) + return 0; + /* Don't allow updating policies by non manager programs. */ + if (!tomoyo_is_policy_manager()) + return -EPERM; + if (tomoyo_is_domain_def(data)) { + domain = NULL; + if (is_delete) + tomoyo_delete_domain(data); + else if (is_select) { + down_read(&tomoyo_domain_list_lock); + domain = tomoyo_find_domain(data); + up_read(&tomoyo_domain_list_lock); + } else if (is_undelete) + domain = tomoyo_undelete_domain(data); + else + domain = tomoyo_find_or_assign_new_domain(data, 0); + head->write_var1 = domain; + return 0; + } + if (!domain) + return -EINVAL; + + if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1 + && profile < TOMOYO_MAX_PROFILES) { + if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded) + domain->profile = (u8) profile; + return 0; + } + if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { + tomoyo_set_domain_flag(domain, is_delete, + TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ); + return 0; + } + return tomoyo_write_file_policy(data, domain, is_delete); +} + +/** + * tomoyo_print_single_path_acl - Print a single path ACL entry. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * @ptr: Pointer to "struct tomoyo_single_path_acl_record". + * + * Returns true on success, false otherwise. + */ +static bool tomoyo_print_single_path_acl(struct tomoyo_io_buffer *head, + struct tomoyo_single_path_acl_record * + ptr) +{ + int pos; + u8 bit; + const char *atmark = ""; + const char *filename; + const u16 perm = ptr->perm; + + filename = ptr->filename->name; + for (bit = head->read_bit; bit < TOMOYO_MAX_SINGLE_PATH_OPERATION; + bit++) { + const char *msg; + if (!(perm & (1 << bit))) + continue; + /* Print "read/write" instead of "read" and "write". */ + if ((bit == TOMOYO_TYPE_READ_ACL || + bit == TOMOYO_TYPE_WRITE_ACL) + && (perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL))) + continue; + msg = tomoyo_sp2keyword(bit); + pos = head->read_avail; + if (!tomoyo_io_printf(head, "allow_%s %s%s\n", msg, + atmark, filename)) + goto out; + } + head->read_bit = 0; + return true; + out: + head->read_bit = bit; + head->read_avail = pos; + return false; +} + +/** + * tomoyo_print_double_path_acl - Print a double path ACL entry. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * @ptr: Pointer to "struct tomoyo_double_path_acl_record". + * + * Returns true on success, false otherwise. + */ +static bool tomoyo_print_double_path_acl(struct tomoyo_io_buffer *head, + struct tomoyo_double_path_acl_record * + ptr) +{ + int pos; + const char *atmark1 = ""; + const char *atmark2 = ""; + const char *filename1; + const char *filename2; + const u8 perm = ptr->perm; + u8 bit; + + filename1 = ptr->filename1->name; + filename2 = ptr->filename2->name; + for (bit = head->read_bit; bit < TOMOYO_MAX_DOUBLE_PATH_OPERATION; + bit++) { + const char *msg; + if (!(perm & (1 << bit))) + continue; + msg = tomoyo_dp2keyword(bit); + pos = head->read_avail; + if (!tomoyo_io_printf(head, "allow_%s %s%s %s%s\n", msg, + atmark1, filename1, atmark2, filename2)) + goto out; + } + head->read_bit = 0; + return true; + out: + head->read_bit = bit; + head->read_avail = pos; + return false; +} + +/** + * tomoyo_print_entry - Print an ACL entry. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * @ptr: Pointer to an ACL entry. + * + * Returns true on success, false otherwise. + */ +static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, + struct tomoyo_acl_info *ptr) +{ + const u8 acl_type = tomoyo_acl_type2(ptr); + + if (acl_type & TOMOYO_ACL_DELETED) + return true; + if (acl_type == TOMOYO_TYPE_SINGLE_PATH_ACL) { + struct tomoyo_single_path_acl_record *acl + = container_of(ptr, + struct tomoyo_single_path_acl_record, + head); + return tomoyo_print_single_path_acl(head, acl); + } + if (acl_type == TOMOYO_TYPE_DOUBLE_PATH_ACL) { + struct tomoyo_double_path_acl_record *acl + = container_of(ptr, + struct tomoyo_double_path_acl_record, + head); + return tomoyo_print_double_path_acl(head, acl); + } + BUG(); /* This must not happen. */ + return false; +} + +/** + * tomoyo_read_domain_policy - Read domain policy. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0. + */ +static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head) +{ + struct list_head *dpos; + struct list_head *apos; + bool done = true; + + if (head->read_eof) + return 0; + if (head->read_step == 0) + head->read_step = 1; + down_read(&tomoyo_domain_list_lock); + list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) { + struct tomoyo_domain_info *domain; + const char *quota_exceeded = ""; + const char *transition_failed = ""; + const char *ignore_global_allow_read = ""; + domain = list_entry(dpos, struct tomoyo_domain_info, list); + if (head->read_step != 1) + goto acl_loop; + if (domain->is_deleted && !head->read_single_domain) + continue; + /* Print domainname and flags. */ + if (domain->quota_warned) + quota_exceeded = "quota_exceeded\n"; + if (domain->flags & TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED) + transition_failed = "transition_failed\n"; + if (domain->flags & + TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ) + ignore_global_allow_read + = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n"; + if (!tomoyo_io_printf(head, + "%s\n" TOMOYO_KEYWORD_USE_PROFILE "%u\n" + "%s%s%s\n", domain->domainname->name, + domain->profile, quota_exceeded, + transition_failed, + ignore_global_allow_read)) { + done = false; + break; + } + head->read_step = 2; +acl_loop: + if (head->read_step == 3) + goto tail_mark; + /* Print ACL entries in the domain. */ + down_read(&tomoyo_domain_acl_info_list_lock); + list_for_each_cookie(apos, head->read_var2, + &domain->acl_info_list) { + struct tomoyo_acl_info *ptr + = list_entry(apos, struct tomoyo_acl_info, + list); + if (!tomoyo_print_entry(head, ptr)) { + done = false; + break; + } + } + up_read(&tomoyo_domain_acl_info_list_lock); + if (!done) + break; + head->read_step = 3; +tail_mark: + if (!tomoyo_io_printf(head, "\n")) { + done = false; + break; + } + head->read_step = 1; + if (head->read_single_domain) + break; + } + up_read(&tomoyo_domain_list_lock); + head->read_eof = done; + return 0; +} + +/** + * tomoyo_write_domain_profile - Assign profile for specified domain. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0 on success, -EINVAL otherwise. + * + * This is equivalent to doing + * + * ( echo "select " $domainname; echo "use_profile " $profile ) | + * /usr/lib/ccs/loadpolicy -d + */ +static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head) +{ + char *data = head->write_buf; + char *cp = strchr(data, ' '); + struct tomoyo_domain_info *domain; + unsigned long profile; + + if (!cp) + return -EINVAL; + *cp = '\0'; + down_read(&tomoyo_domain_list_lock); + domain = tomoyo_find_domain(cp + 1); + up_read(&tomoyo_domain_list_lock); + if (strict_strtoul(data, 10, &profile)) + return -EINVAL; + if (domain && profile < TOMOYO_MAX_PROFILES + && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)) + domain->profile = (u8) profile; + return 0; +} + +/** + * tomoyo_read_domain_profile - Read only domainname and profile. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns list of profile number and domainname pairs. + * + * This is equivalent to doing + * + * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | + * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) + * domainname = $0; } else if ( $1 == "use_profile" ) { + * print $2 " " domainname; domainname = ""; } } ; ' + */ +static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head) +{ + struct list_head *pos; + bool done = true; + + if (head->read_eof) + return 0; + down_read(&tomoyo_domain_list_lock); + list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) { + struct tomoyo_domain_info *domain; + domain = list_entry(pos, struct tomoyo_domain_info, list); + if (domain->is_deleted) + continue; + if (!tomoyo_io_printf(head, "%u %s\n", domain->profile, + domain->domainname->name)) { + done = false; + break; + } + } + up_read(&tomoyo_domain_list_lock); + head->read_eof = done; + return 0; +} + +/** + * tomoyo_write_pid: Specify PID to obtain domainname. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0. + */ +static int tomoyo_write_pid(struct tomoyo_io_buffer *head) +{ + unsigned long pid; + /* No error check. */ + strict_strtoul(head->write_buf, 10, &pid); + head->read_step = (int) pid; + head->read_eof = false; + return 0; +} + +/** + * tomoyo_read_pid - Get domainname of the specified PID. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns the domainname which the specified PID is in on success, + * empty string otherwise. + * The PID is specified by tomoyo_write_pid() so that the user can obtain + * using read()/write() interface rather than sysctl() interface. + */ +static int tomoyo_read_pid(struct tomoyo_io_buffer *head) +{ + if (head->read_avail == 0 && !head->read_eof) { + const int pid = head->read_step; + struct task_struct *p; + struct tomoyo_domain_info *domain = NULL; + /***** CRITICAL SECTION START *****/ + read_lock(&tasklist_lock); + p = find_task_by_vpid(pid); + if (p) + domain = tomoyo_real_domain(p); + read_unlock(&tasklist_lock); + /***** CRITICAL SECTION END *****/ + if (domain) + tomoyo_io_printf(head, "%d %u %s", pid, domain->profile, + domain->domainname->name); + head->read_eof = true; + } + return 0; +} + +/** + * tomoyo_write_exception_policy - Write exception policy. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head) +{ + char *data = head->write_buf; + bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); + + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN)) + return tomoyo_write_domain_keeper_policy(data, false, + is_delete); + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN)) + return tomoyo_write_domain_keeper_policy(data, true, is_delete); + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN)) + return tomoyo_write_domain_initializer_policy(data, false, + is_delete); + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN)) + return tomoyo_write_domain_initializer_policy(data, true, + is_delete); + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS)) + return tomoyo_write_alias_policy(data, is_delete); + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ)) + return tomoyo_write_globally_readable_policy(data, is_delete); + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN)) + return tomoyo_write_pattern_policy(data, is_delete); + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE)) + return tomoyo_write_no_rewrite_policy(data, is_delete); + return -EINVAL; +} + +/** + * tomoyo_read_exception_policy - Read exception policy. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0 on success, -EINVAL otherwise. + */ +static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head) +{ + if (!head->read_eof) { + switch (head->read_step) { + case 0: + head->read_var2 = NULL; + head->read_step = 1; + case 1: + if (!tomoyo_read_domain_keeper_policy(head)) + break; + head->read_var2 = NULL; + head->read_step = 2; + case 2: + if (!tomoyo_read_globally_readable_policy(head)) + break; + head->read_var2 = NULL; + head->read_step = 3; + case 3: + head->read_var2 = NULL; + head->read_step = 4; + case 4: + if (!tomoyo_read_domain_initializer_policy(head)) + break; + head->read_var2 = NULL; + head->read_step = 5; + case 5: + if (!tomoyo_read_alias_policy(head)) + break; + head->read_var2 = NULL; + head->read_step = 6; + case 6: + head->read_var2 = NULL; + head->read_step = 7; + case 7: + if (!tomoyo_read_file_pattern(head)) + break; + head->read_var2 = NULL; + head->read_step = 8; + case 8: + if (!tomoyo_read_no_rewrite_policy(head)) + break; + head->read_var2 = NULL; + head->read_step = 9; + case 9: + head->read_eof = true; + break; + default: + return -EINVAL; + } + } + return 0; +} + +/* path to policy loader */ +static const char *tomoyo_loader = "/sbin/tomoyo-init"; + +/** + * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists. + * + * Returns true if /sbin/tomoyo-init exists, false otherwise. + */ +static bool tomoyo_policy_loader_exists(void) +{ + /* + * Don't activate MAC if the policy loader doesn't exist. + * If the initrd includes /sbin/init but real-root-dev has not + * mounted on / yet, activating MAC will block the system since + * policies are not loaded yet. + * Thus, let do_execve() call this function everytime. + */ + struct nameidata nd; + + if (path_lookup(tomoyo_loader, LOOKUP_FOLLOW, &nd)) { + printk(KERN_INFO "Not activating Mandatory Access Control now " + "since %s doesn't exist.\n", tomoyo_loader); + return false; + } + path_put(&nd.path); + return true; +} + +/** + * tomoyo_load_policy - Run external policy loader to load policy. + * + * @filename: The program about to start. + * + * This function checks whether @filename is /sbin/init , and if so + * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init + * and then continues invocation of /sbin/init. + * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and + * writes to /sys/kernel/security/tomoyo/ interfaces. + * + * Returns nothing. + */ +void tomoyo_load_policy(const char *filename) +{ + char *argv[2]; + char *envp[3]; + + if (tomoyo_policy_loaded) + return; + /* + * Check filename is /sbin/init or /sbin/tomoyo-start. + * /sbin/tomoyo-start is a dummy filename in case where /sbin/init can't + * be passed. + * You can create /sbin/tomoyo-start by + * "ln -s /bin/true /sbin/tomoyo-start". + */ + if (strcmp(filename, "/sbin/init") && + strcmp(filename, "/sbin/tomoyo-start")) + return; + if (!tomoyo_policy_loader_exists()) + return; + + printk(KERN_INFO "Calling %s to load policy. Please wait.\n", + tomoyo_loader); + argv[0] = (char *) tomoyo_loader; + argv[1] = NULL; + envp[0] = "HOME=/"; + envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; + envp[2] = NULL; + call_usermodehelper(argv[0], argv, envp, 1); + + printk(KERN_INFO "TOMOYO: 2.2.0-pre 2009/02/01\n"); + printk(KERN_INFO "Mandatory Access Control activated.\n"); + tomoyo_policy_loaded = true; + { /* Check all profiles currently assigned to domains are defined. */ + struct tomoyo_domain_info *domain; + down_read(&tomoyo_domain_list_lock); + list_for_each_entry(domain, &tomoyo_domain_list, list) { + const u8 profile = domain->profile; + if (tomoyo_profile_ptr[profile]) + continue; + panic("Profile %u (used by '%s') not defined.\n", + profile, domain->domainname->name); + } + up_read(&tomoyo_domain_list_lock); + } +} + +/** + * tomoyo_read_version: Get version. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns version information. + */ +static int tomoyo_read_version(struct tomoyo_io_buffer *head) +{ + if (!head->read_eof) { + tomoyo_io_printf(head, "2.2.0-pre"); + head->read_eof = true; + } + return 0; +} + +/** + * tomoyo_read_self_domain - Get the current process's domainname. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns the current process's domainname. + */ +static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head) +{ + if (!head->read_eof) { + /* + * tomoyo_domain()->domainname != NULL + * because every process belongs to a domain and + * the domain's name cannot be NULL. + */ + tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name); + head->read_eof = true; + } + return 0; +} + +/** + * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. + * + * @type: Type of interface. + * @file: Pointer to "struct file". + * + * Associates policy handler and returns 0 on success, -ENOMEM otherwise. + */ +static int tomoyo_open_control(const u8 type, struct file *file) +{ + struct tomoyo_io_buffer *head = tomoyo_alloc(sizeof(*head)); + + if (!head) + return -ENOMEM; + mutex_init(&head->io_sem); + switch (type) { + case TOMOYO_DOMAINPOLICY: + /* /sys/kernel/security/tomoyo/domain_policy */ + head->write = tomoyo_write_domain_policy; + head->read = tomoyo_read_domain_policy; + break; + case TOMOYO_EXCEPTIONPOLICY: + /* /sys/kernel/security/tomoyo/exception_policy */ + head->write = tomoyo_write_exception_policy; + head->read = tomoyo_read_exception_policy; + break; + case TOMOYO_SELFDOMAIN: + /* /sys/kernel/security/tomoyo/self_domain */ + head->read = tomoyo_read_self_domain; + break; + case TOMOYO_DOMAIN_STATUS: + /* /sys/kernel/security/tomoyo/.domain_status */ + head->write = tomoyo_write_domain_profile; + head->read = tomoyo_read_domain_profile; + break; + case TOMOYO_PROCESS_STATUS: + /* /sys/kernel/security/tomoyo/.process_status */ + head->write = tomoyo_write_pid; + head->read = tomoyo_read_pid; + break; + case TOMOYO_VERSION: + /* /sys/kernel/security/tomoyo/version */ + head->read = tomoyo_read_version; + head->readbuf_size = 128; + break; + case TOMOYO_MEMINFO: + /* /sys/kernel/security/tomoyo/meminfo */ + head->write = tomoyo_write_memory_quota; + head->read = tomoyo_read_memory_counter; + head->readbuf_size = 512; + break; + case TOMOYO_PROFILE: + /* /sys/kernel/security/tomoyo/profile */ + head->write = tomoyo_write_profile; + head->read = tomoyo_read_profile; + break; + case TOMOYO_MANAGER: + /* /sys/kernel/security/tomoyo/manager */ + head->write = tomoyo_write_manager_policy; + head->read = tomoyo_read_manager_policy; + break; + } + if (!(file->f_mode & FMODE_READ)) { + /* + * No need to allocate read_buf since it is not opened + * for reading. + */ + head->read = NULL; + } else { + if (!head->readbuf_size) + head->readbuf_size = 4096 * 2; + head->read_buf = tomoyo_alloc(head->readbuf_size); + if (!head->read_buf) { + tomoyo_free(head); + return -ENOMEM; + } + } + if (!(file->f_mode & FMODE_WRITE)) { + /* + * No need to allocate write_buf since it is not opened + * for writing. + */ + head->write = NULL; + } else if (head->write) { + head->writebuf_size = 4096 * 2; + head->write_buf = tomoyo_alloc(head->writebuf_size); + if (!head->write_buf) { + tomoyo_free(head->read_buf); + tomoyo_free(head); + return -ENOMEM; + } + } + file->private_data = head; + /* + * Call the handler now if the file is + * /sys/kernel/security/tomoyo/self_domain + * so that the user can use + * cat < /sys/kernel/security/tomoyo/self_domain" + * to know the current process's domainname. + */ + if (type == TOMOYO_SELFDOMAIN) + tomoyo_read_control(file, NULL, 0); + return 0; +} + +/** + * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. + * + * @file: Pointer to "struct file". + * @buffer: Poiner to buffer to write to. + * @buffer_len: Size of @buffer. + * + * Returns bytes read on success, negative value otherwise. + */ +static int tomoyo_read_control(struct file *file, char __user *buffer, + const int buffer_len) +{ + int len = 0; + struct tomoyo_io_buffer *head = file->private_data; + char *cp; + + if (!head->read) + return -ENOSYS; + if (mutex_lock_interruptible(&head->io_sem)) + return -EINTR; + /* Call the policy handler. */ + len = head->read(head); + if (len < 0) + goto out; + /* Write to buffer. */ + len = head->read_avail; + if (len > buffer_len) + len = buffer_len; + if (!len) + goto out; + /* head->read_buf changes by some functions. */ + cp = head->read_buf; + if (copy_to_user(buffer, cp, len)) { + len = -EFAULT; + goto out; + } + head->read_avail -= len; + memmove(cp, cp + len, head->read_avail); + out: + mutex_unlock(&head->io_sem); + return len; +} + +/** + * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. + * + * @file: Pointer to "struct file". + * @buffer: Pointer to buffer to read from. + * @buffer_len: Size of @buffer. + * + * Returns @buffer_len on success, negative value otherwise. + */ +static int tomoyo_write_control(struct file *file, const char __user *buffer, + const int buffer_len) +{ + struct tomoyo_io_buffer *head = file->private_data; + int error = buffer_len; + int avail_len = buffer_len; + char *cp0 = head->write_buf; + + if (!head->write) + return -ENOSYS; + if (!access_ok(VERIFY_READ, buffer, buffer_len)) + return -EFAULT; + /* Don't allow updating policies by non manager programs. */ + if (head->write != tomoyo_write_pid && + head->write != tomoyo_write_domain_policy && + !tomoyo_is_policy_manager()) + return -EPERM; + if (mutex_lock_interruptible(&head->io_sem)) + return -EINTR; + /* Read a line and dispatch it to the policy handler. */ + while (avail_len > 0) { + char c; + if (head->write_avail >= head->writebuf_size - 1) { + error = -ENOMEM; + break; + } else if (get_user(c, buffer)) { + error = -EFAULT; + break; + } + buffer++; + avail_len--; + cp0[head->write_avail++] = c; + if (c != '\n') + continue; + cp0[head->write_avail - 1] = '\0'; + head->write_avail = 0; + tomoyo_normalize_line(cp0); + head->write(head); + } + mutex_unlock(&head->io_sem); + return error; +} + +/** + * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. + * + * @file: Pointer to "struct file". + * + * Releases memory and returns 0. + */ +static int tomoyo_close_control(struct file *file) +{ + struct tomoyo_io_buffer *head = file->private_data; + + /* Release memory used for policy I/O. */ + tomoyo_free(head->read_buf); + head->read_buf = NULL; + tomoyo_free(head->write_buf); + head->write_buf = NULL; + tomoyo_free(head); + head = NULL; + file->private_data = NULL; + return 0; +} + +/** + * tomoyo_alloc_acl_element - Allocate permanent memory for ACL entry. + * + * @acl_type: Type of ACL entry. + * + * Returns pointer to the ACL entry on success, NULL otherwise. + */ +void *tomoyo_alloc_acl_element(const u8 acl_type) +{ + int len; + struct tomoyo_acl_info *ptr; + + switch (acl_type) { + case TOMOYO_TYPE_SINGLE_PATH_ACL: + len = sizeof(struct tomoyo_single_path_acl_record); + break; + case TOMOYO_TYPE_DOUBLE_PATH_ACL: + len = sizeof(struct tomoyo_double_path_acl_record); + break; + default: + return NULL; + } + ptr = tomoyo_alloc_element(len); + if (!ptr) + return NULL; + ptr->type = acl_type; + return ptr; +} + +/** + * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface. + * + * @inode: Pointer to "struct inode". + * @file: Pointer to "struct file". + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_open(struct inode *inode, struct file *file) +{ + const int key = ((u8 *) file->f_path.dentry->d_inode->i_private) + - ((u8 *) NULL); + return tomoyo_open_control(key, file); +} + +/** + * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface. + * + * @inode: Pointer to "struct inode". + * @file: Pointer to "struct file". + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_release(struct inode *inode, struct file *file) +{ + return tomoyo_close_control(file); +} + +/** + * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface. + * + * @file: Pointer to "struct file". + * @buf: Pointer to buffer. + * @count: Size of @buf. + * @ppos: Unused. + * + * Returns bytes read on success, negative value otherwise. + */ +static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count, + loff_t *ppos) +{ + return tomoyo_read_control(file, buf, count); +} + +/** + * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface. + * + * @file: Pointer to "struct file". + * @buf: Pointer to buffer. + * @count: Size of @buf. + * @ppos: Unused. + * + * Returns @count on success, negative value otherwise. + */ +static ssize_t tomoyo_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + return tomoyo_write_control(file, buf, count); +} + +/* Operations for /sys/kernel/security/tomoyo/ interface. */ +static const struct file_operations tomoyo_operations = { + .open = tomoyo_open, + .release = tomoyo_release, + .read = tomoyo_read, + .write = tomoyo_write, +}; + +/** + * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory. + * + * @name: The name of the interface file. + * @mode: The permission of the interface file. + * @parent: The parent directory. + * @key: Type of interface. + * + * Returns nothing. + */ +static void __init tomoyo_create_entry(const char *name, const mode_t mode, + struct dentry *parent, const u8 key) +{ + securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key, + &tomoyo_operations); +} + +/** + * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface. + * + * Returns 0. + */ +static int __init tomoyo_initerface_init(void) +{ + struct dentry *tomoyo_dir; + + /* Don't create securityfs entries unless registered. */ + if (current_cred()->security != &tomoyo_kernel_domain) + return 0; + + tomoyo_dir = securityfs_create_dir("tomoyo", NULL); + tomoyo_create_entry("domain_policy", 0600, tomoyo_dir, + TOMOYO_DOMAINPOLICY); + tomoyo_create_entry("exception_policy", 0600, tomoyo_dir, + TOMOYO_EXCEPTIONPOLICY); + tomoyo_create_entry("self_domain", 0400, tomoyo_dir, + TOMOYO_SELFDOMAIN); + tomoyo_create_entry(".domain_status", 0600, tomoyo_dir, + TOMOYO_DOMAIN_STATUS); + tomoyo_create_entry(".process_status", 0600, tomoyo_dir, + TOMOYO_PROCESS_STATUS); + tomoyo_create_entry("meminfo", 0600, tomoyo_dir, + TOMOYO_MEMINFO); + tomoyo_create_entry("profile", 0600, tomoyo_dir, + TOMOYO_PROFILE); + tomoyo_create_entry("manager", 0600, tomoyo_dir, + TOMOYO_MANAGER); + tomoyo_create_entry("version", 0400, tomoyo_dir, + TOMOYO_VERSION); + return 0; +} + +fs_initcall(tomoyo_initerface_init); diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h new file mode 100644 index 0000000..6dcb7cc --- /dev/null +++ b/security/tomoyo/common.h @@ -0,0 +1,359 @@ +/* + * security/tomoyo/common.h + * + * Common functions for TOMOYO. + * + * Copyright (C) 2005-2009 NTT DATA CORPORATION + * + * Version: 2.2.0-pre 2009/02/01 + * + */ + +#ifndef _SECURITY_TOMOYO_COMMON_H +#define _SECURITY_TOMOYO_COMMON_H + +#include <linux/ctype.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/file.h> +#include <linux/kmod.h> +#include <linux/fs.h> +#include <linux/sched.h> +#include <linux/namei.h> +#include <linux/mount.h> +#include <linux/list.h> + +struct dentry; +struct vfsmount; + +/* Temporary buffer for holding pathnames. */ +struct tomoyo_page_buffer { + char buffer[4096]; +}; + +/* Structure for holding a token. */ +struct tomoyo_path_info { + const char *name; + u32 hash; /* = full_name_hash(name, strlen(name)) */ + u16 total_len; /* = strlen(name) */ + u16 const_len; /* = tomoyo_const_part_length(name) */ + bool is_dir; /* = tomoyo_strendswith(name, "/") */ + bool is_patterned; /* = tomoyo_path_contains_pattern(name) */ + u16 depth; /* = tomoyo_path_depth(name) */ +}; + +/* + * This is the max length of a token. + * + * A token consists of only ASCII printable characters. + * Non printable characters in a token is represented in \ooo style + * octal string. Thus, \ itself is represented as \\. + */ +#define TOMOYO_MAX_PATHNAME_LEN 4000 + +/* Structure for holding requested pathname. */ +struct tomoyo_path_info_with_data { + /* Keep "head" first, for this pointer is passed to tomoyo_free(). */ + struct tomoyo_path_info head; + char bariier1[16]; /* Safeguard for overrun. */ + char body[TOMOYO_MAX_PATHNAME_LEN]; + char barrier2[16]; /* Safeguard for overrun. */ +}; + +/* + * Common header for holding ACL entries. + * + * Packing "struct tomoyo_acl_info" allows + * "struct tomoyo_single_path_acl_record" to embed "u16" and + * "struct tomoyo_double_path_acl_record" to embed "u8" + * without enlarging their structure size. + */ +struct tomoyo_acl_info { + struct list_head list; + /* + * Type of this ACL entry. + * + * MSB is is_deleted flag. + */ + u8 type; +} __packed; + +/* This ACL entry is deleted. */ +#define TOMOYO_ACL_DELETED 0x80 + +/* Structure for domain information. */ +struct tomoyo_domain_info { + struct list_head list; + struct list_head acl_info_list; + /* Name of this domain. Never NULL. */ + const struct tomoyo_path_info *domainname; + u8 profile; /* Profile number to use. */ + u8 is_deleted; /* Delete flag. + 0 = active. + 1 = deleted but undeletable. + 255 = deleted and no longer undeletable. */ + bool quota_warned; /* Quota warnning flag. */ + /* DOMAIN_FLAGS_*. Use tomoyo_set_domain_flag() to modify. */ + u8 flags; +}; + +/* Profile number is an integer between 0 and 255. */ +#define TOMOYO_MAX_PROFILES 256 + +/* Ignore "allow_read" directive in exception policy. */ +#define TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ 1 +/* + * This domain was unable to create a new domain at tomoyo_find_next_domain() + * because the name of the domain to be created was too long or + * it could not allocate memory. + * More than one process continued execve() without domain transition. + */ +#define TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED 2 + +/* + * Structure for "allow_read/write", "allow_execute", "allow_read", + * "allow_write", "allow_create", "allow_unlink", "allow_mkdir", "allow_rmdir", + * "allow_mkfifo", "allow_mksock", "allow_mkblock", "allow_mkchar", + * "allow_truncate", "allow_symlink" and "allow_rewrite" directive. + */ +struct tomoyo_single_path_acl_record { + struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_SINGLE_PATH_ACL */ + u16 perm; + /* Pointer to single pathname. */ + const struct tomoyo_path_info *filename; +}; + +/* Structure for "allow_rename" and "allow_link" directive. */ +struct tomoyo_double_path_acl_record { + struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_DOUBLE_PATH_ACL */ + u8 perm; + /* Pointer to single pathname. */ + const struct tomoyo_path_info *filename1; + /* Pointer to single pathname. */ + const struct tomoyo_path_info *filename2; +}; + +/* Keywords for ACLs. */ +#define TOMOYO_KEYWORD_ALIAS "alias " +#define TOMOYO_KEYWORD_ALLOW_READ "allow_read " +#define TOMOYO_KEYWORD_DELETE "delete " +#define TOMOYO_KEYWORD_DENY_REWRITE "deny_rewrite " +#define TOMOYO_KEYWORD_FILE_PATTERN "file_pattern " +#define TOMOYO_KEYWORD_INITIALIZE_DOMAIN "initialize_domain " +#define TOMOYO_KEYWORD_KEEP_DOMAIN "keep_domain " +#define TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN "no_initialize_domain " +#define TOMOYO_KEYWORD_NO_KEEP_DOMAIN "no_keep_domain " +#define TOMOYO_KEYWORD_SELECT "select " +#define TOMOYO_KEYWORD_UNDELETE "undelete " +#define TOMOYO_KEYWORD_USE_PROFILE "use_profile " +#define TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "ignore_global_allow_read" +/* A domain definition starts with <kernel>. */ +#define TOMOYO_ROOT_NAME "<kernel>" +#define TOMOYO_ROOT_NAME_LEN (sizeof(TOMOYO_ROOT_NAME) - 1) + +/* Index numbers for Access Controls. */ +#define TOMOYO_MAC_FOR_FILE 0 /* domain_policy.conf */ +#define TOMOYO_MAX_ACCEPT_ENTRY 1 +#define TOMOYO_VERBOSE 2 +#define TOMOYO_MAX_CONTROL_INDEX 3 + +/* Structure for reading/writing policy via securityfs interfaces. */ +struct tomoyo_io_buffer { + int (*read) (struct tomoyo_io_buffer *); + int (*write) (struct tomoyo_io_buffer *); + /* Exclusive lock for this structure. */ + struct mutex io_sem; + /* The position currently reading from. */ + struct list_head *read_var1; + /* Extra variables for reading. */ + struct list_head *read_var2; + /* The position currently writing to. */ + struct tomoyo_domain_info *write_var1; + /* The step for reading. */ + int read_step; + /* Buffer for reading. */ + char *read_buf; + /* EOF flag for reading. */ + bool read_eof; + /* Read domain ACL of specified PID? */ + bool read_single_domain; + /* Extra variable for reading. */ + u8 read_bit; + /* Bytes available for reading. */ + int read_avail; + /* Size of read buffer. */ + int readbuf_size; + /* Buffer for writing. */ + char *write_buf; + /* Bytes available for writing. */ + int write_avail; + /* Size of write buffer. */ + int writebuf_size; +}; + +/* Check whether the domain has too many ACL entries to hold. */ +bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain); +/* Transactional sprintf() for policy dump. */ +bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...) + __attribute__ ((format(printf, 2, 3))); +/* Check whether the domainname is correct. */ +bool tomoyo_is_correct_domain(const unsigned char *domainname, + const char *function); +/* Check whether the token is correct. */ +bool tomoyo_is_correct_path(const char *filename, const s8 start_type, + const s8 pattern_type, const s8 end_type, + const char *function); +/* Check whether the token can be a domainname. */ +bool tomoyo_is_domain_def(const unsigned char *buffer); +/* Check whether the given filename matches the given pattern. */ +bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename, + const struct tomoyo_path_info *pattern); +/* Read "alias" entry in exception policy. */ +bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head); +/* + * Read "initialize_domain" and "no_initialize_domain" entry + * in exception policy. + */ +bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head); +/* Read "keep_domain" and "no_keep_domain" entry in exception policy. */ +bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head); +/* Read "file_pattern" entry in exception policy. */ +bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head); +/* Read "allow_read" entry in exception policy. */ +bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head); +/* Read "deny_rewrite" entry in exception policy. */ +bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head); +/* Write domain policy violation warning message to console? */ +bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain); +/* Convert double path operation to operation name. */ +const char *tomoyo_dp2keyword(const u8 operation); +/* Get the last component of the given domainname. */ +const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain); +/* Get warning message. */ +const char *tomoyo_get_msg(const bool is_enforce); +/* Convert single path operation to operation name. */ +const char *tomoyo_sp2keyword(const u8 operation); +/* Delete a domain. */ +int tomoyo_delete_domain(char *data); +/* Create "alias" entry in exception policy. */ +int tomoyo_write_alias_policy(char *data, const bool is_delete); +/* + * Create "initialize_domain" and "no_initialize_domain" entry + * in exception policy. + */ +int tomoyo_write_domain_initializer_policy(char *data, const bool is_not, + const bool is_delete); +/* Create "keep_domain" and "no_keep_domain" entry in exception policy. */ +int tomoyo_write_domain_keeper_policy(char *data, const bool is_not, + const bool is_delete); +/* + * Create "allow_read/write", "allow_execute", "allow_read", "allow_write", + * "allow_create", "allow_unlink", "allow_mkdir", "allow_rmdir", + * "allow_mkfifo", "allow_mksock", "allow_mkblock", "allow_mkchar", + * "allow_truncate", "allow_symlink", "allow_rewrite", "allow_rename" and + * "allow_link" entry in domain policy. + */ +int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, + const bool is_delete); +/* Create "allow_read" entry in exception policy. */ +int tomoyo_write_globally_readable_policy(char *data, const bool is_delete); +/* Create "deny_rewrite" entry in exception policy. */ +int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete); +/* Create "file_pattern" entry in exception policy. */ +int tomoyo_write_pattern_policy(char *data, const bool is_delete); +/* Find a domain by the given name. */ +struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname); +/* Find or create a domain by the given name. */ +struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char * + domainname, + const u8 profile); +/* Undelete a domain. */ +struct tomoyo_domain_info *tomoyo_undelete_domain(const char *domainname); +/* Check mode for specified functionality. */ +unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain, + const u8 index); +/* Allocate memory for structures. */ +void *tomoyo_alloc_acl_element(const u8 acl_type); +/* Fill in "struct tomoyo_path_info" members. */ +void tomoyo_fill_path_info(struct tomoyo_path_info *ptr); +/* Run policy loader when /sbin/init starts. */ +void tomoyo_load_policy(const char *filename); +/* Change "struct tomoyo_domain_info"->flags. */ +void tomoyo_set_domain_flag(struct tomoyo_domain_info *domain, + const bool is_delete, const u8 flags); + +/* strcmp() for "struct tomoyo_path_info" structure. */ +static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a, + const struct tomoyo_path_info *b) +{ + return a->hash != b->hash || strcmp(a->name, b->name); +} + +/* Get type of an ACL entry. */ +static inline u8 tomoyo_acl_type1(struct tomoyo_acl_info *ptr) +{ + return ptr->type & ~TOMOYO_ACL_DELETED; +} + +/* Get type of an ACL entry. */ +static inline u8 tomoyo_acl_type2(struct tomoyo_acl_info *ptr) +{ + return ptr->type; +} + +/** + * tomoyo_is_valid - Check whether the character is a valid char. + * + * @c: The character to check. + * + * Returns true if @c is a valid character, false otherwise. + */ +static inline bool tomoyo_is_valid(const unsigned char c) +{ + return c > ' ' && c < 127; +} + +/** + * tomoyo_is_invalid - Check whether the character is an invalid char. + * + * @c: The character to check. + * + * Returns true if @c is an invalid character, false otherwise. + */ +static inline bool tomoyo_is_invalid(const unsigned char c) +{ + return c && (c <= ' ' || c >= 127); +} + +/* The list for "struct tomoyo_domain_info". */ +extern struct list_head tomoyo_domain_list; +extern struct rw_semaphore tomoyo_domain_list_lock; + +/* Lock for domain->acl_info_list. */ +extern struct rw_semaphore tomoyo_domain_acl_info_list_lock; + +/* Has /sbin/init started? */ +extern bool tomoyo_policy_loaded; + +/* The kernel's domain. */ +extern struct tomoyo_domain_info tomoyo_kernel_domain; + +/** + * list_for_each_cookie - iterate over a list with cookie. + * @pos: the &struct list_head to use as a loop cursor. + * @cookie: the &struct list_head to use as a cookie. + * @head: the head for your list. + * + * Same with list_for_each() except that this primitive uses @cookie + * so that we can continue iteration. + * @cookie must be NULL when iteration starts, and @cookie will become + * NULL when iteration finishes. + */ +#define list_for_each_cookie(pos, cookie, head) \ + for (({ if (!cookie) \ + cookie = head; }), \ + pos = (cookie)->next; \ + prefetch(pos->next), pos != (head) || ((cookie) = NULL); \ + (cookie) = pos, pos = pos->next) + +#endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */ diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c new file mode 100644 index 0000000..093a756 --- /dev/null +++ b/security/tomoyo/domain.c @@ -0,0 +1,878 @@ +/* + * security/tomoyo/domain.c + * + * Implementation of the Domain-Based Mandatory Access Control. + * + * Copyright (C) 2005-2009 NTT DATA CORPORATION + * + * Version: 2.2.0-pre 2009/02/01 + * + */ + +#include "common.h" +#include "tomoyo.h" +#include "realpath.h" +#include <linux/binfmts.h> + +/* Variables definitions.*/ + +/* The initial domain. */ +struct tomoyo_domain_info tomoyo_kernel_domain; + +/* The list for "struct tomoyo_domain_info". */ +LIST_HEAD(tomoyo_domain_list); +DECLARE_RWSEM(tomoyo_domain_list_lock); + +/* Structure for "initialize_domain" and "no_initialize_domain" keyword. */ +struct tomoyo_domain_initializer_entry { + struct list_head list; + const struct tomoyo_path_info *domainname; /* This may be NULL */ + const struct tomoyo_path_info *program; + bool is_deleted; + bool is_not; /* True if this entry is "no_initialize_domain". */ + /* True if the domainname is tomoyo_get_last_name(). */ + bool is_last_name; +}; + +/* Structure for "keep_domain" and "no_keep_domain" keyword. */ +struct tomoyo_domain_keeper_entry { + struct list_head list; + const struct tomoyo_path_info *domainname; + const struct tomoyo_path_info *program; /* This may be NULL */ + bool is_deleted; + bool is_not; /* True if this entry is "no_keep_domain". */ + /* True if the domainname is tomoyo_get_last_name(). */ + bool is_last_name; +}; + +/* Structure for "alias" keyword. */ +struct tomoyo_alias_entry { + struct list_head list; + const struct tomoyo_path_info *original_name; + const struct tomoyo_path_info *aliased_name; + bool is_deleted; +}; + +/** + * tomoyo_set_domain_flag - Set or clear domain's attribute flags. + * + * @domain: Pointer to "struct tomoyo_domain_info". + * @is_delete: True if it is a delete request. + * @flags: Flags to set or clear. + * + * Returns nothing. + */ +void tomoyo_set_domain_flag(struct tomoyo_domain_info *domain, + const bool is_delete, const u8 flags) +{ + /* We need to serialize because this is bitfield operation. */ + static DEFINE_SPINLOCK(lock); + /***** CRITICAL SECTION START *****/ + spin_lock(&lock); + if (!is_delete) + domain->flags |= flags; + else + domain->flags &= ~flags; + spin_unlock(&lock); + /***** CRITICAL SECTION END *****/ +} + +/** + * tomoyo_get_last_name - Get last component of a domainname. + * + * @domain: Pointer to "struct tomoyo_domain_info". + * + * Returns the last component of the domainname. + */ +const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain) +{ + const char *cp0 = domain->domainname->name; + const char *cp1 = strrchr(cp0, ' '); + + if (cp1) + return cp1 + 1; + return cp0; +} + +/* The list for "struct tomoyo_domain_initializer_entry". */ +static LIST_HEAD(tomoyo_domain_initializer_list); +static DECLARE_RWSEM(tomoyo_domain_initializer_list_lock); + +/** + * tomoyo_update_domain_initializer_entry - Update "struct tomoyo_domain_initializer_entry" list. + * + * @domainname: The name of domain. May be NULL. + * @program: The name of program. + * @is_not: True if it is "no_initialize_domain" entry. + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_update_domain_initializer_entry(const char *domainname, + const char *program, + const bool is_not, + const bool is_delete) +{ + struct tomoyo_domain_initializer_entry *new_entry; + struct tomoyo_domain_initializer_entry *ptr; + const struct tomoyo_path_info *saved_program; + const struct tomoyo_path_info *saved_domainname = NULL; + int error = -ENOMEM; + bool is_last_name = false; + + if (!tomoyo_is_correct_path(program, 1, -1, -1, __func__)) + return -EINVAL; /* No patterns allowed. */ + if (domainname) { + if (!tomoyo_is_domain_def(domainname) && + tomoyo_is_correct_path(domainname, 1, -1, -1, __func__)) + is_last_name = true; + else if (!tomoyo_is_correct_domain(domainname, __func__)) + return -EINVAL; + saved_domainname = tomoyo_save_name(domainname); + if (!saved_domainname) + return -ENOMEM; + } + saved_program = tomoyo_save_name(program); + if (!saved_program) + return -ENOMEM; + /***** EXCLUSIVE SECTION START *****/ + down_write(&tomoyo_domain_initializer_list_lock); + list_for_each_entry(ptr, &tomoyo_domain_initializer_list, list) { + if (ptr->is_not != is_not || + ptr->domainname != saved_domainname || + ptr->program != saved_program) + continue; + ptr->is_deleted = is_delete; + error = 0; + goto out; + } + if (is_delete) { + error = -ENOENT; + goto out; + } + new_entry = tomoyo_alloc_element(sizeof(*new_entry)); + if (!new_entry) + goto out; + new_entry->domainname = saved_domainname; + new_entry->program = saved_program; + new_entry->is_not = is_not; + new_entry->is_last_name = is_last_name; + list_add_tail(&new_entry->list, &tomoyo_domain_initializer_list); + error = 0; + out: + up_write(&tomoyo_domain_initializer_list_lock); + /***** EXCLUSIVE SECTION END *****/ + return error; +} + +/** + * tomoyo_read_domain_initializer_policy - Read "struct tomoyo_domain_initializer_entry" list. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns true on success, false otherwise. + */ +bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head) +{ + struct list_head *pos; + bool done = true; + + down_read(&tomoyo_domain_initializer_list_lock); + list_for_each_cookie(pos, head->read_var2, + &tomoyo_domain_initializer_list) { + const char *no; + const char *from = ""; + const char *domain = ""; + struct tomoyo_domain_initializer_entry *ptr; + ptr = list_entry(pos, struct tomoyo_domain_initializer_entry, + list); + if (ptr->is_deleted) + continue; + no = ptr->is_not ? "no_" : ""; + if (ptr->domainname) { + from = " from "; + domain = ptr->domainname->name; + } + if (!tomoyo_io_printf(head, + "%s" TOMOYO_KEYWORD_INITIALIZE_DOMAIN + "%s%s%s\n", no, ptr->program->name, from, + domain)) { + done = false; + break; + } + } + up_read(&tomoyo_domain_initializer_list_lock); + return done; +} + +/** + * tomoyo_write_domain_initializer_policy - Write "struct tomoyo_domain_initializer_entry" list. + * + * @data: String to parse. + * @is_not: True if it is "no_initialize_domain" entry. + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + */ +int tomoyo_write_domain_initializer_policy(char *data, const bool is_not, + const bool is_delete) +{ + char *cp = strstr(data, " from "); + + if (cp) { + *cp = '\0'; + return tomoyo_update_domain_initializer_entry(cp + 6, data, + is_not, + is_delete); + } + return tomoyo_update_domain_initializer_entry(NULL, data, is_not, + is_delete); +} + +/** + * tomoyo_is_domain_initializer - Check whether the given program causes domainname reinitialization. + * + * @domainname: The name of domain. + * @program: The name of program. + * @last_name: The last component of @domainname. + * + * Returns true if executing @program reinitializes domain transition, + * false otherwise. + */ +static bool tomoyo_is_domain_initializer(const struct tomoyo_path_info * + domainname, + const struct tomoyo_path_info *program, + const struct tomoyo_path_info * + last_name) +{ + struct tomoyo_domain_initializer_entry *ptr; + bool flag = false; + + down_read(&tomoyo_domain_initializer_list_lock); + list_for_each_entry(ptr, &tomoyo_domain_initializer_list, list) { + if (ptr->is_deleted) + continue; + if (ptr->domainname) { + if (!ptr->is_last_name) { + if (ptr->domainname != domainname) + continue; + } else { + if (tomoyo_pathcmp(ptr->domainname, last_name)) + continue; + } + } + if (tomoyo_pathcmp(ptr->program, program)) + continue; + if (ptr->is_not) { + flag = false; + break; + } + flag = true; + } + up_read(&tomoyo_domain_initializer_list_lock); + return flag; +} + +/* The list for "struct tomoyo_domain_keeper_entry". */ +static LIST_HEAD(tomoyo_domain_keeper_list); +static DECLARE_RWSEM(tomoyo_domain_keeper_list_lock); + +/** + * tomoyo_update_domain_keeper_entry - Update "struct tomoyo_domain_keeper_entry" list. + * + * @domainname: The name of domain. + * @program: The name of program. May be NULL. + * @is_not: True if it is "no_keep_domain" entry. + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_update_domain_keeper_entry(const char *domainname, + const char *program, + const bool is_not, + const bool is_delete) +{ + struct tomoyo_domain_keeper_entry *new_entry; + struct tomoyo_domain_keeper_entry *ptr; + const struct tomoyo_path_info *saved_domainname; + const struct tomoyo_path_info *saved_program = NULL; + static DEFINE_MUTEX(lock); + int error = -ENOMEM; + bool is_last_name = false; + + if (!tomoyo_is_domain_def(domainname) && + tomoyo_is_correct_path(domainname, 1, -1, -1, __func__)) + is_last_name = true; + else if (!tomoyo_is_correct_domain(domainname, __func__)) + return -EINVAL; + if (program) { + if (!tomoyo_is_correct_path(program, 1, -1, -1, __func__)) + return -EINVAL; + saved_program = tomoyo_save_name(program); + if (!saved_program) + return -ENOMEM; + } + saved_domainname = tomoyo_save_name(domainname); + if (!saved_domainname) + return -ENOMEM; + /***** EXCLUSIVE SECTION START *****/ + down_write(&tomoyo_domain_keeper_list_lock); + list_for_each_entry(ptr, &tomoyo_domain_keeper_list, list) { + if (ptr->is_not != is_not || + ptr->domainname != saved_domainname || + ptr->program != saved_program) + continue; + ptr->is_deleted = is_delete; + error = 0; + goto out; + } + if (is_delete) { + error = -ENOENT; + goto out; + } + new_entry = tomoyo_alloc_element(sizeof(*new_entry)); + if (!new_entry) + goto out; + new_entry->domainname = saved_domainname; + new_entry->program = saved_program; + new_entry->is_not = is_not; + new_entry->is_last_name = is_last_name; + list_add_tail(&new_entry->list, &tomoyo_domain_keeper_list); + error = 0; + out: + up_write(&tomoyo_domain_keeper_list_lock); + /***** EXCLUSIVE SECTION END *****/ + return error; +} + +/** + * tomoyo_write_domain_keeper_policy - Write "struct tomoyo_domain_keeper_entry" list. + * + * @data: String to parse. + * @is_not: True if it is "no_keep_domain" entry. + * @is_delete: True if it is a delete request. + * + */ +int tomoyo_write_domain_keeper_policy(char *data, const bool is_not, + const bool is_delete) +{ + char *cp = strstr(data, " from "); + + if (cp) { + *cp = '\0'; + return tomoyo_update_domain_keeper_entry(cp + 6, data, is_not, + is_delete); + } + return tomoyo_update_domain_keeper_entry(data, NULL, is_not, is_delete); +} + +/** + * tomoyo_read_domain_keeper_policy - Read "struct tomoyo_domain_keeper_entry" list. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns true on success, false otherwise. + */ +bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head) +{ + struct list_head *pos; + bool done = true; + + down_read(&tomoyo_domain_keeper_list_lock); + list_for_each_cookie(pos, head->read_var2, + &tomoyo_domain_keeper_list) { + struct tomoyo_domain_keeper_entry *ptr; + const char *no; + const char *from = ""; + const char *program = ""; + + ptr = list_entry(pos, struct tomoyo_domain_keeper_entry, list); + if (ptr->is_deleted) + continue; + no = ptr->is_not ? "no_" : ""; + if (ptr->program) { + from = " from "; + program = ptr->program->name; + } + if (!tomoyo_io_printf(head, + "%s" TOMOYO_KEYWORD_KEEP_DOMAIN + "%s%s%s\n", no, program, from, + ptr->domainname->name)) { + done = false; + break; + } + } + up_read(&tomoyo_domain_keeper_list_lock); + return done; +} + +/** + * tomoyo_is_domain_keeper - Check whether the given program causes domain transition suppression. + * + * @domainname: The name of domain. + * @program: The name of program. + * @last_name: The last component of @domainname. + * + * Returns true if executing @program supresses domain transition, + * false otherwise. + */ +static bool tomoyo_is_domain_keeper(const struct tomoyo_path_info *domainname, + const struct tomoyo_path_info *program, + const struct tomoyo_path_info *last_name) +{ + struct tomoyo_domain_keeper_entry *ptr; + bool flag = false; + + down_read(&tomoyo_domain_keeper_list_lock); + list_for_each_entry(ptr, &tomoyo_domain_keeper_list, list) { + if (ptr->is_deleted) + continue; + if (!ptr->is_last_name) { + if (ptr->domainname != domainname) + continue; + } else { + if (tomoyo_pathcmp(ptr->domainname, last_name)) + continue; + } + if (ptr->program && tomoyo_pathcmp(ptr->program, program)) + continue; + if (ptr->is_not) { + flag = false; + break; + } + flag = true; + } + up_read(&tomoyo_domain_keeper_list_lock); + return flag; +} + +/* The list for "struct tomoyo_alias_entry". */ +static LIST_HEAD(tomoyo_alias_list); +static DECLARE_RWSEM(tomoyo_alias_list_lock); + +/** + * tomoyo_update_alias_entry - Update "struct tomoyo_alias_entry" list. + * + * @original_name: The original program's real name. + * @aliased_name: The symbolic program's symbolic link's name. + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_update_alias_entry(const char *original_name, + const char *aliased_name, + const bool is_delete) +{ + struct tomoyo_alias_entry *new_entry; + struct tomoyo_alias_entry *ptr; + const struct tomoyo_path_info *saved_original_name; + const struct tomoyo_path_info *saved_aliased_name; + int error = -ENOMEM; + + if (!tomoyo_is_correct_path(original_name, 1, -1, -1, __func__) || + !tomoyo_is_correct_path(aliased_name, 1, -1, -1, __func__)) + return -EINVAL; /* No patterns allowed. */ + saved_original_name = tomoyo_save_name(original_name); + saved_aliased_name = tomoyo_save_name(aliased_name); + if (!saved_original_name || !saved_aliased_name) + return -ENOMEM; + /***** EXCLUSIVE SECTION START *****/ + down_write(&tomoyo_alias_list_lock); + list_for_each_entry(ptr, &tomoyo_alias_list, list) { + if (ptr->original_name != saved_original_name || + ptr->aliased_name != saved_aliased_name) + continue; + ptr->is_deleted = is_delete; + error = 0; + goto out; + } + if (is_delete) { + error = -ENOENT; + goto out; + } + new_entry = tomoyo_alloc_element(sizeof(*new_entry)); + if (!new_entry) + goto out; + new_entry->original_name = saved_original_name; + new_entry->aliased_name = saved_aliased_name; + list_add_tail(&new_entry->list, &tomoyo_alias_list); + error = 0; + out: + up_write(&tomoyo_alias_list_lock); + /***** EXCLUSIVE SECTION END *****/ + return error; +} + +/** + * tomoyo_read_alias_policy - Read "struct tomoyo_alias_entry" list. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns true on success, false otherwise. + */ +bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head) +{ + struct list_head *pos; + bool done = true; + + down_read(&tomoyo_alias_list_lock); + list_for_each_cookie(pos, head->read_var2, &tomoyo_alias_list) { + struct tomoyo_alias_entry *ptr; + + ptr = list_entry(pos, struct tomoyo_alias_entry, list); + if (ptr->is_deleted) + continue; + if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALIAS "%s %s\n", + ptr->original_name->name, + ptr->aliased_name->name)) { + done = false; + break; + } + } + up_read(&tomoyo_alias_list_lock); + return done; +} + +/** + * tomoyo_write_alias_policy - Write "struct tomoyo_alias_entry" list. + * + * @data: String to parse. + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + */ +int tomoyo_write_alias_policy(char *data, const bool is_delete) +{ + char *cp = strchr(data, ' '); + + if (!cp) + return -EINVAL; + *cp++ = '\0'; + return tomoyo_update_alias_entry(data, cp, is_delete); +} + +/* Domain create/delete/undelete handler. */ + +/* #define TOMOYO_DEBUG_DOMAIN_UNDELETE */ + +/** + * tomoyo_delete_domain - Delete a domain. + * + * @domainname: The name of domain. + * + * Returns 0. + */ +int tomoyo_delete_domain(char *domainname) +{ + struct tomoyo_domain_info *domain; + struct tomoyo_path_info name; + + name.name = domainname; + tomoyo_fill_path_info(&name); + /***** EXCLUSIVE SECTION START *****/ + down_write(&tomoyo_domain_list_lock); +#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE + printk(KERN_DEBUG "tomoyo_delete_domain %s\n", domainname); + list_for_each_entry(domain, &tomoyo_domain_list, list) { + if (tomoyo_pathcmp(domain->domainname, &name)) + continue; + printk(KERN_DEBUG "List: %p %u\n", domain, domain->is_deleted); + } +#endif + /* Is there an active domain? */ + list_for_each_entry(domain, &tomoyo_domain_list, list) { + struct tomoyo_domain_info *domain2; + /* Never delete tomoyo_kernel_domain */ + if (domain == &tomoyo_kernel_domain) + continue; + if (domain->is_deleted || + tomoyo_pathcmp(domain->domainname, &name)) + continue; + /* Mark already deleted domains as non undeletable. */ + list_for_each_entry(domain2, &tomoyo_domain_list, list) { + if (!domain2->is_deleted || + tomoyo_pathcmp(domain2->domainname, &name)) + continue; +#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE + if (domain2->is_deleted != 255) + printk(KERN_DEBUG + "Marked %p as non undeletable\n", + domain2); +#endif + domain2->is_deleted = 255; + } + /* Delete and mark active domain as undeletable. */ + domain->is_deleted = 1; +#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE + printk(KERN_DEBUG "Marked %p as undeletable\n", domain); +#endif + break; + } + up_write(&tomoyo_domain_list_lock); + /***** EXCLUSIVE SECTION END *****/ + return 0; +} + +/** + * tomoyo_undelete_domain - Undelete a domain. + * + * @domainname: The name of domain. + * + * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. + */ +struct tomoyo_domain_info *tomoyo_undelete_domain(const char *domainname) +{ + struct tomoyo_domain_info *domain; + struct tomoyo_domain_info *candidate_domain = NULL; + struct tomoyo_path_info name; + + name.name = domainname; + tomoyo_fill_path_info(&name); + /***** EXCLUSIVE SECTION START *****/ + down_write(&tomoyo_domain_list_lock); +#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE + printk(KERN_DEBUG "tomoyo_undelete_domain %s\n", domainname); + list_for_each_entry(domain, &tomoyo_domain_list, list) { + if (tomoyo_pathcmp(domain->domainname, &name)) + continue; + printk(KERN_DEBUG "List: %p %u\n", domain, domain->is_deleted); + } +#endif + list_for_each_entry(domain, &tomoyo_domain_list, list) { + if (tomoyo_pathcmp(&name, domain->domainname)) + continue; + if (!domain->is_deleted) { + /* This domain is active. I can't undelete. */ + candidate_domain = NULL; +#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE + printk(KERN_DEBUG "%p is active. I can't undelete.\n", + domain); +#endif + break; + } + /* Is this domain undeletable? */ + if (domain->is_deleted == 1) + candidate_domain = domain; + } + if (candidate_domain) { + candidate_domain->is_deleted = 0; +#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE + printk(KERN_DEBUG "%p was undeleted.\n", candidate_domain); +#endif + } + up_write(&tomoyo_domain_list_lock); + /***** EXCLUSIVE SECTION END *****/ + return candidate_domain; +} + +/** + * tomoyo_find_or_assign_new_domain - Create a domain. + * + * @domainname: The name of domain. + * @profile: Profile number to assign if the domain was newly created. + * + * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. + */ +struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char * + domainname, + const u8 profile) +{ + struct tomoyo_domain_info *domain = NULL; + const struct tomoyo_path_info *saved_domainname; + + /***** EXCLUSIVE SECTION START *****/ + down_write(&tomoyo_domain_list_lock); + domain = tomoyo_find_domain(domainname); + if (domain) + goto out; + if (!tomoyo_is_correct_domain(domainname, __func__)) + goto out; + saved_domainname = tomoyo_save_name(domainname); + if (!saved_domainname) + goto out; + /* Can I reuse memory of deleted domain? */ + list_for_each_entry(domain, &tomoyo_domain_list, list) { + struct task_struct *p; + struct tomoyo_acl_info *ptr; + bool flag; + if (!domain->is_deleted || + domain->domainname != saved_domainname) + continue; + flag = false; + /***** CRITICAL SECTION START *****/ + read_lock(&tasklist_lock); + for_each_process(p) { + if (tomoyo_real_domain(p) != domain) + continue; + flag = true; + break; + } + read_unlock(&tasklist_lock); + /***** CRITICAL SECTION END *****/ + if (flag) + continue; +#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE + printk(KERN_DEBUG "Reusing %p %s\n", domain, + domain->domainname->name); +#endif + list_for_each_entry(ptr, &domain->acl_info_list, list) { + ptr->type |= TOMOYO_ACL_DELETED; + } + tomoyo_set_domain_flag(domain, true, domain->flags); + domain->profile = profile; + domain->quota_warned = false; + mb(); /* Avoid out-of-order execution. */ + domain->is_deleted = 0; + goto out; + } + /* No memory reusable. Create using new memory. */ + domain = tomoyo_alloc_element(sizeof(*domain)); + if (domain) { + INIT_LIST_HEAD(&domain->acl_info_list); + domain->domainname = saved_domainname; + domain->profile = profile; + list_add_tail(&domain->list, &tomoyo_domain_list); + } + out: + up_write(&tomoyo_domain_list_lock); + /***** EXCLUSIVE SECTION END *****/ + return domain; +} + +/** + * tomoyo_find_next_domain - Find a domain. + * + * @bprm: Pointer to "struct linux_binprm". + * @next_domain: Pointer to pointer to "struct tomoyo_domain_info". + * + * Returns 0 on success, negative value otherwise. + */ +int tomoyo_find_next_domain(struct linux_binprm *bprm, + struct tomoyo_domain_info **next_domain) +{ + /* + * This function assumes that the size of buffer returned by + * tomoyo_realpath() = TOMOYO_MAX_PATHNAME_LEN. + */ + struct tomoyo_page_buffer *tmp = tomoyo_alloc(sizeof(*tmp)); + struct tomoyo_domain_info *old_domain = tomoyo_domain(); + struct tomoyo_domain_info *domain = NULL; + const char *old_domain_name = old_domain->domainname->name; + const char *original_name = bprm->filename; + char *new_domain_name = NULL; + char *real_program_name = NULL; + char *symlink_program_name = NULL; + const u8 mode = tomoyo_check_flags(old_domain, TOMOYO_MAC_FOR_FILE); + const bool is_enforce = (mode == 3); + int retval = -ENOMEM; + struct tomoyo_path_info r; /* real name */ + struct tomoyo_path_info s; /* symlink name */ + struct tomoyo_path_info l; /* last name */ + static bool initialized; + + if (!tmp) + goto out; + + if (!initialized) { + /* + * Built-in initializers. This is needed because policies are + * not loaded until starting /sbin/init. + */ + tomoyo_update_domain_initializer_entry(NULL, "/sbin/hotplug", + false, false); + tomoyo_update_domain_initializer_entry(NULL, "/sbin/modprobe", + false, false); + initialized = true; + } + + /* Get tomoyo_realpath of program. */ + retval = -ENOENT; + /* I hope tomoyo_realpath() won't fail with -ENOMEM. */ + real_program_name = tomoyo_realpath(original_name); + if (!real_program_name) + goto out; + /* Get tomoyo_realpath of symbolic link. */ + symlink_program_name = tomoyo_realpath_nofollow(original_name); + if (!symlink_program_name) + goto out; + + r.name = real_program_name; + tomoyo_fill_path_info(&r); + s.name = symlink_program_name; + tomoyo_fill_path_info(&s); + l.name = tomoyo_get_last_name(old_domain); + tomoyo_fill_path_info(&l); + + /* Check 'alias' directive. */ + if (tomoyo_pathcmp(&r, &s)) { + struct tomoyo_alias_entry *ptr; + /* Is this program allowed to be called via symbolic links? */ + down_read(&tomoyo_alias_list_lock); + list_for_each_entry(ptr, &tomoyo_alias_list, list) { + if (ptr->is_deleted || + tomoyo_pathcmp(&r, ptr->original_name) || + tomoyo_pathcmp(&s, ptr->aliased_name)) + continue; + memset(real_program_name, 0, TOMOYO_MAX_PATHNAME_LEN); + strncpy(real_program_name, ptr->aliased_name->name, + TOMOYO_MAX_PATHNAME_LEN - 1); + tomoyo_fill_path_info(&r); + break; + } + up_read(&tomoyo_alias_list_lock); + } + + /* Check execute permission. */ + retval = tomoyo_check_exec_perm(old_domain, &r, tmp); + if (retval < 0) + goto out; + + new_domain_name = tmp->buffer; + if (tomoyo_is_domain_initializer(old_domain->domainname, &r, &l)) { + /* Transit to the child of tomoyo_kernel_domain domain. */ + snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1, + TOMOYO_ROOT_NAME " " "%s", real_program_name); + } else if (old_domain == &tomoyo_kernel_domain && + !tomoyo_policy_loaded) { + /* + * Needn't to transit from kernel domain before starting + * /sbin/init. But transit from kernel domain if executing + * initializers because they might start before /sbin/init. + */ + domain = old_domain; + } else if (tomoyo_is_domain_keeper(old_domain->domainname, &r, &l)) { + /* Keep current domain. */ + domain = old_domain; + } else { + /* Normal domain transition. */ + snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1, + "%s %s", old_domain_name, real_program_name); + } + if (domain || strlen(new_domain_name) >= TOMOYO_MAX_PATHNAME_LEN) + goto done; + down_read(&tomoyo_domain_list_lock); + domain = tomoyo_find_domain(new_domain_name); + up_read(&tomoyo_domain_list_lock); + if (domain) + goto done; + if (is_enforce) + goto done; + domain = tomoyo_find_or_assign_new_domain(new_domain_name, + old_domain->profile); + done: + if (domain) + goto out; + printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", + new_domain_name); + if (is_enforce) + retval = -EPERM; + else + tomoyo_set_domain_flag(old_domain, false, + TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED); + out: + tomoyo_free(real_program_name); + tomoyo_free(symlink_program_name); + *next_domain = domain ? domain : old_domain; + tomoyo_free(tmp); + return retval; +} diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c new file mode 100644 index 0000000..65f50c1 --- /dev/null +++ b/security/tomoyo/file.c @@ -0,0 +1,1241 @@ +/* + * security/tomoyo/file.c + * + * Implementation of the Domain-Based Mandatory Access Control. + * + * Copyright (C) 2005-2009 NTT DATA CORPORATION + * + * Version: 2.2.0-pre 2009/02/01 + * + */ + +#include "common.h" +#include "tomoyo.h" +#include "realpath.h" +#define ACC_MODE(x) ("\000\004\002\006"[(x)&O_ACCMODE]) + +/* Structure for "allow_read" keyword. */ +struct tomoyo_globally_readable_file_entry { + struct list_head list; + const struct tomoyo_path_info *filename; + bool is_deleted; +}; + +/* Structure for "file_pattern" keyword. */ +struct tomoyo_pattern_entry { + struct list_head list; + const struct tomoyo_path_info *pattern; + bool is_deleted; +}; + +/* Structure for "deny_rewrite" keyword. */ +struct tomoyo_no_rewrite_entry { + struct list_head list; + const struct tomoyo_path_info *pattern; + bool is_deleted; +}; + +/* Keyword array for single path operations. */ +static const char *tomoyo_sp_keyword[TOMOYO_MAX_SINGLE_PATH_OPERATION] = { + [TOMOYO_TYPE_READ_WRITE_ACL] = "read/write", + [TOMOYO_TYPE_EXECUTE_ACL] = "execute", + [TOMOYO_TYPE_READ_ACL] = "read", + [TOMOYO_TYPE_WRITE_ACL] = "write", + [TOMOYO_TYPE_CREATE_ACL] = "create", + [TOMOYO_TYPE_UNLINK_ACL] = "unlink", + [TOMOYO_TYPE_MKDIR_ACL] = "mkdir", + [TOMOYO_TYPE_RMDIR_ACL] = "rmdir", + [TOMOYO_TYPE_MKFIFO_ACL] = "mkfifo", + [TOMOYO_TYPE_MKSOCK_ACL] = "mksock", + [TOMOYO_TYPE_MKBLOCK_ACL] = "mkblock", + [TOMOYO_TYPE_MKCHAR_ACL] = "mkchar", + [TOMOYO_TYPE_TRUNCATE_ACL] = "truncate", + [TOMOYO_TYPE_SYMLINK_ACL] = "symlink", + [TOMOYO_TYPE_REWRITE_ACL] = "rewrite", +}; + +/* Keyword array for double path operations. */ +static const char *tomoyo_dp_keyword[TOMOYO_MAX_DOUBLE_PATH_OPERATION] = { + [TOMOYO_TYPE_LINK_ACL] = "link", + [TOMOYO_TYPE_RENAME_ACL] = "rename", +}; + +/** + * tomoyo_sp2keyword - Get the name of single path operation. + * + * @operation: Type of operation. + * + * Returns the name of single path operation. + */ +const char *tomoyo_sp2keyword(const u8 operation) +{ + return (operation < TOMOYO_MAX_SINGLE_PATH_OPERATION) + ? tomoyo_sp_keyword[operation] : NULL; +} + +/** + * tomoyo_dp2keyword - Get the name of double path operation. + * + * @operation: Type of operation. + * + * Returns the name of double path operation. + */ +const char *tomoyo_dp2keyword(const u8 operation) +{ + return (operation < TOMOYO_MAX_DOUBLE_PATH_OPERATION) + ? tomoyo_dp_keyword[operation] : NULL; +} + +/** + * tomoyo_strendswith - Check whether the token ends with the given token. + * + * @name: The token to check. + * @tail: The token to find. + * + * Returns true if @name ends with @tail, false otherwise. + */ +static bool tomoyo_strendswith(const char *name, const char *tail) +{ + int len; + + if (!name || !tail) + return false; + len = strlen(name) - strlen(tail); + return len >= 0 && !strcmp(name + len, tail); +} + +/** + * tomoyo_get_path - Get realpath. + * + * @path: Pointer to "struct path". + * + * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise. + */ +static struct tomoyo_path_info *tomoyo_get_path(struct path *path) +{ + int error; + struct tomoyo_path_info_with_data *buf = tomoyo_alloc(sizeof(*buf)); + + if (!buf) + return NULL; + /* Reserve one byte for appending "/". */ + error = tomoyo_realpath_from_path2(path, buf->body, + sizeof(buf->body) - 2); + if (!error) { + buf->head.name = buf->body; + tomoyo_fill_path_info(&buf->head); + return &buf->head; + } + tomoyo_free(buf); + return NULL; +} + +/* Lock for domain->acl_info_list. */ +DECLARE_RWSEM(tomoyo_domain_acl_info_list_lock); + +static int tomoyo_update_double_path_acl(const u8 type, const char *filename1, + const char *filename2, + struct tomoyo_domain_info * + const domain, const bool is_delete); +static int tomoyo_update_single_path_acl(const u8 type, const char *filename, + struct tomoyo_domain_info * + const domain, const bool is_delete); + +/* The list for "struct tomoyo_globally_readable_file_entry". */ +static LIST_HEAD(tomoyo_globally_readable_list); +static DECLARE_RWSEM(tomoyo_globally_readable_list_lock); + +/** + * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. + * + * @filename: Filename unconditionally permitted to open() for reading. + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_update_globally_readable_entry(const char *filename, + const bool is_delete) +{ + struct tomoyo_globally_readable_file_entry *new_entry; + struct tomoyo_globally_readable_file_entry *ptr; + const struct tomoyo_path_info *saved_filename; + int error = -ENOMEM; + + if (!tomoyo_is_correct_path(filename, 1, 0, -1, __func__)) + return -EINVAL; + saved_filename = tomoyo_save_name(filename); + if (!saved_filename) + return -ENOMEM; + /***** EXCLUSIVE SECTION START *****/ + down_write(&tomoyo_globally_readable_list_lock); + list_for_each_entry(ptr, &tomoyo_globally_readable_list, list) { + if (ptr->filename != saved_filename) + continue; + ptr->is_deleted = is_delete; + error = 0; + goto out; + } + if (is_delete) { + error = -ENOENT; + goto out; + } + new_entry = tomoyo_alloc_element(sizeof(*new_entry)); + if (!new_entry) + goto out; + new_entry->filename = saved_filename; + list_add_tail(&new_entry->list, &tomoyo_globally_readable_list); + error = 0; + out: + up_write(&tomoyo_globally_readable_list_lock); + /***** EXCLUSIVE SECTION END *****/ + return error; +} + +/** + * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. + * + * @filename: The filename to check. + * + * Returns true if any domain can open @filename for reading, false otherwise. + */ +static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * + filename) +{ + struct tomoyo_globally_readable_file_entry *ptr; + bool found = false; + down_read(&tomoyo_globally_readable_list_lock); + list_for_each_entry(ptr, &tomoyo_globally_readable_list, list) { + if (!ptr->is_deleted && + tomoyo_path_matches_pattern(filename, ptr->filename)) { + found = true; + break; + } + } + up_read(&tomoyo_globally_readable_list_lock); + return found; +} + +/** + * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. + * + * @data: String to parse. + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + */ +int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) +{ + return tomoyo_update_globally_readable_entry(data, is_delete); +} + +/** + * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns true on success, false otherwise. + */ +bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) +{ + struct list_head *pos; + bool done = true; + + down_read(&tomoyo_globally_readable_list_lock); + list_for_each_cookie(pos, head->read_var2, + &tomoyo_globally_readable_list) { + struct tomoyo_globally_readable_file_entry *ptr; + ptr = list_entry(pos, + struct tomoyo_globally_readable_file_entry, + list); + if (ptr->is_deleted) + continue; + if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", + ptr->filename->name)) { + done = false; + break; + } + } + up_read(&tomoyo_globally_readable_list_lock); + return done; +} + +/* The list for "struct tomoyo_pattern_entry". */ +static LIST_HEAD(tomoyo_pattern_list); +static DECLARE_RWSEM(tomoyo_pattern_list_lock); + +/** + * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. + * + * @pattern: Pathname pattern. + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_update_file_pattern_entry(const char *pattern, + const bool is_delete) +{ + struct tomoyo_pattern_entry *new_entry; + struct tomoyo_pattern_entry *ptr; + const struct tomoyo_path_info *saved_pattern; + int error = -ENOMEM; + + if (!tomoyo_is_correct_path(pattern, 0, 1, 0, __func__)) + return -EINVAL; + saved_pattern = tomoyo_save_name(pattern); + if (!saved_pattern) + return -ENOMEM; + /***** EXCLUSIVE SECTION START *****/ + down_write(&tomoyo_pattern_list_lock); + list_for_each_entry(ptr, &tomoyo_pattern_list, list) { + if (saved_pattern != ptr->pattern) + continue; + ptr->is_deleted = is_delete; + error = 0; + goto out; + } + if (is_delete) { + error = -ENOENT; + goto out; + } + new_entry = tomoyo_alloc_element(sizeof(*new_entry)); + if (!new_entry) + goto out; + new_entry->pattern = saved_pattern; + list_add_tail(&new_entry->list, &tomoyo_pattern_list); + error = 0; + out: + up_write(&tomoyo_pattern_list_lock); + /***** EXCLUSIVE SECTION END *****/ + return error; +} + +/** + * tomoyo_get_file_pattern - Get patterned pathname. + * + * @filename: The filename to find patterned pathname. + * + * Returns pointer to pathname pattern if matched, @filename otherwise. + */ +static const struct tomoyo_path_info * +tomoyo_get_file_pattern(const struct tomoyo_path_info *filename) +{ + struct tomoyo_pattern_entry *ptr; + const struct tomoyo_path_info *pattern = NULL; + + down_read(&tomoyo_pattern_list_lock); + list_for_each_entry(ptr, &tomoyo_pattern_list, list) { + if (ptr->is_deleted) + continue; + if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) + continue; + pattern = ptr->pattern; + if (tomoyo_strendswith(pattern->name, "/\\*")) { + /* Do nothing. Try to find the better match. */ + } else { + /* This would be the better match. Use this. */ + break; + } + } + up_read(&tomoyo_pattern_list_lock); + if (pattern) + filename = pattern; + return filename; +} + +/** + * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. + * + * @data: String to parse. + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + */ +int tomoyo_write_pattern_policy(char *data, const bool is_delete) +{ + return tomoyo_update_file_pattern_entry(data, is_delete); +} + +/** + * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns true on success, false otherwise. + */ +bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) +{ + struct list_head *pos; + bool done = true; + + down_read(&tomoyo_pattern_list_lock); + list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { + struct tomoyo_pattern_entry *ptr; + ptr = list_entry(pos, struct tomoyo_pattern_entry, list); + if (ptr->is_deleted) + continue; + if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN "%s\n", + ptr->pattern->name)) { + done = false; + break; + } + } + up_read(&tomoyo_pattern_list_lock); + return done; +} + +/* The list for "struct tomoyo_no_rewrite_entry". */ +static LIST_HEAD(tomoyo_no_rewrite_list); +static DECLARE_RWSEM(tomoyo_no_rewrite_list_lock); + +/** + * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. + * + * @pattern: Pathname pattern that are not rewritable by default. + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_update_no_rewrite_entry(const char *pattern, + const bool is_delete) +{ + struct tomoyo_no_rewrite_entry *new_entry, *ptr; + const struct tomoyo_path_info *saved_pattern; + int error = -ENOMEM; + + if (!tomoyo_is_correct_path(pattern, 0, 0, 0, __func__)) + return -EINVAL; + saved_pattern = tomoyo_save_name(pattern); + if (!saved_pattern) + return -ENOMEM; + /***** EXCLUSIVE SECTION START *****/ + down_write(&tomoyo_no_rewrite_list_lock); + list_for_each_entry(ptr, &tomoyo_no_rewrite_list, list) { + if (ptr->pattern != saved_pattern) + continue; + ptr->is_deleted = is_delete; + error = 0; + goto out; + } + if (is_delete) { + error = -ENOENT; + goto out; + } + new_entry = tomoyo_alloc_element(sizeof(*new_entry)); + if (!new_entry) + goto out; + new_entry->pattern = saved_pattern; + list_add_tail(&new_entry->list, &tomoyo_no_rewrite_list); + error = 0; + out: + up_write(&tomoyo_no_rewrite_list_lock); + /***** EXCLUSIVE SECTION END *****/ + return error; +} + +/** + * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. + * + * @filename: Filename to check. + * + * Returns true if @filename is specified by "deny_rewrite" directive, + * false otherwise. + */ +static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) +{ + struct tomoyo_no_rewrite_entry *ptr; + bool found = false; + + down_read(&tomoyo_no_rewrite_list_lock); + list_for_each_entry(ptr, &tomoyo_no_rewrite_list, list) { + if (ptr->is_deleted) + continue; + if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) + continue; + found = true; + break; + } + up_read(&tomoyo_no_rewrite_list_lock); + return found; +} + +/** + * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. + * + * @data: String to parse. + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + */ +int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) +{ + return tomoyo_update_no_rewrite_entry(data, is_delete); +} + +/** + * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns true on success, false otherwise. + */ +bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) +{ + struct list_head *pos; + bool done = true; + + down_read(&tomoyo_no_rewrite_list_lock); + list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { + struct tomoyo_no_rewrite_entry *ptr; + ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list); + if (ptr->is_deleted) + continue; + if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE "%s\n", + ptr->pattern->name)) { + done = false; + break; + } + } + up_read(&tomoyo_no_rewrite_list_lock); + return done; +} + +/** + * tomoyo_update_file_acl - Update file's read/write/execute ACL. + * + * @filename: Filename. + * @perm: Permission (between 1 to 7). + * @domain: Pointer to "struct tomoyo_domain_info". + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + * + * This is legacy support interface for older policy syntax. + * Current policy syntax uses "allow_read/write" instead of "6", + * "allow_read" instead of "4", "allow_write" instead of "2", + * "allow_execute" instead of "1". + */ +static int tomoyo_update_file_acl(const char *filename, u8 perm, + struct tomoyo_domain_info * const domain, + const bool is_delete) +{ + if (perm > 7 || !perm) { + printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", + __func__, perm, filename); + return -EINVAL; + } + if (filename[0] != '@' && tomoyo_strendswith(filename, "/")) + /* + * Only 'allow_mkdir' and 'allow_rmdir' are valid for + * directory permissions. + */ + return 0; + if (perm & 4) + tomoyo_update_single_path_acl(TOMOYO_TYPE_READ_ACL, filename, + domain, is_delete); + if (perm & 2) + tomoyo_update_single_path_acl(TOMOYO_TYPE_WRITE_ACL, filename, + domain, is_delete); + if (perm & 1) + tomoyo_update_single_path_acl(TOMOYO_TYPE_EXECUTE_ACL, + filename, domain, is_delete); + return 0; +} + +/** + * tomoyo_check_single_path_acl2 - Check permission for single path operation. + * + * @domain: Pointer to "struct tomoyo_domain_info". + * @filename: Filename to check. + * @perm: Permission. + * @may_use_pattern: True if patterned ACL is permitted. + * + * Returns 0 on success, -EPERM otherwise. + */ +static int tomoyo_check_single_path_acl2(const struct tomoyo_domain_info * + domain, + const struct tomoyo_path_info * + filename, + const u16 perm, + const bool may_use_pattern) +{ + struct tomoyo_acl_info *ptr; + int error = -EPERM; + + down_read(&tomoyo_domain_acl_info_list_lock); + list_for_each_entry(ptr, &domain->acl_info_list, list) { + struct tomoyo_single_path_acl_record *acl; + if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL) + continue; + acl = container_of(ptr, struct tomoyo_single_path_acl_record, + head); + if (!(acl->perm & perm)) + continue; + if (may_use_pattern || !acl->filename->is_patterned) { + if (!tomoyo_path_matches_pattern(filename, + acl->filename)) + continue; + } else { + continue; + } + error = 0; + break; + } + up_read(&tomoyo_domain_acl_info_list_lock); + return error; +} + +/** + * tomoyo_check_file_acl - Check permission for opening files. + * + * @domain: Pointer to "struct tomoyo_domain_info". + * @filename: Filename to check. + * @operation: Mode ("read" or "write" or "read/write" or "execute"). + * + * Returns 0 on success, -EPERM otherwise. + */ +static int tomoyo_check_file_acl(const struct tomoyo_domain_info *domain, + const struct tomoyo_path_info *filename, + const u8 operation) +{ + u16 perm = 0; + + if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) + return 0; + if (operation == 6) + perm = 1 << TOMOYO_TYPE_READ_WRITE_ACL; + else if (operation == 4) + perm = 1 << TOMOYO_TYPE_READ_ACL; + else if (operation == 2) + perm = 1 << TOMOYO_TYPE_WRITE_ACL; + else if (operation == 1) + perm = 1 << TOMOYO_TYPE_EXECUTE_ACL; + else + BUG(); + return tomoyo_check_single_path_acl2(domain, filename, perm, + operation != 1); +} + +/** + * tomoyo_check_file_perm2 - Check permission for opening files. + * + * @domain: Pointer to "struct tomoyo_domain_info". + * @filename: Filename to check. + * @perm: Mode ("read" or "write" or "read/write" or "execute"). + * @operation: Operation name passed used for verbose mode. + * @mode: Access control mode. + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_check_file_perm2(struct tomoyo_domain_info * const domain, + const struct tomoyo_path_info *filename, + const u8 perm, const char *operation, + const u8 mode) +{ + const bool is_enforce = (mode == 3); + const char *msg = "<unknown>"; + int error = 0; + + if (!filename) + return 0; + error = tomoyo_check_file_acl(domain, filename, perm); + if (error && perm == 4 && + (domain->flags & TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ) == 0 + && tomoyo_is_globally_readable_file(filename)) + error = 0; + if (perm == 6) + msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_WRITE_ACL); + else if (perm == 4) + msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_ACL); + else if (perm == 2) + msg = tomoyo_sp2keyword(TOMOYO_TYPE_WRITE_ACL); + else if (perm == 1) + msg = tomoyo_sp2keyword(TOMOYO_TYPE_EXECUTE_ACL); + else + BUG(); + if (!error) + return 0; + if (tomoyo_verbose_mode(domain)) + printk(KERN_WARNING "TOMOYO-%s: Access '%s(%s) %s' denied " + "for %s\n", tomoyo_get_msg(is_enforce), msg, operation, + filename->name, tomoyo_get_last_name(domain)); + if (is_enforce) + return error; + if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { + /* Don't use patterns for execute permission. */ + const struct tomoyo_path_info *patterned_file = (perm != 1) ? + tomoyo_get_file_pattern(filename) : filename; + tomoyo_update_file_acl(patterned_file->name, perm, + domain, false); + } + return 0; +} + +/** + * tomoyo_write_file_policy - Update file related list. + * + * @data: String to parse. + * @domain: Pointer to "struct tomoyo_domain_info". + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + */ +int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, + const bool is_delete) +{ + char *filename = strchr(data, ' '); + char *filename2; + unsigned int perm; + u8 type; + + if (!filename) + return -EINVAL; + *filename++ = '\0'; + if (sscanf(data, "%u", &perm) == 1) + return tomoyo_update_file_acl(filename, (u8) perm, domain, + is_delete); + if (strncmp(data, "allow_", 6)) + goto out; + data += 6; + for (type = 0; type < TOMOYO_MAX_SINGLE_PATH_OPERATION; type++) { + if (strcmp(data, tomoyo_sp_keyword[type])) + continue; + return tomoyo_update_single_path_acl(type, filename, + domain, is_delete); + } + filename2 = strchr(filename, ' '); + if (!filename2) + goto out; + *filename2++ = '\0'; + for (type = 0; type < TOMOYO_MAX_DOUBLE_PATH_OPERATION; type++) { + if (strcmp(data, tomoyo_dp_keyword[type])) + continue; + return tomoyo_update_double_path_acl(type, filename, filename2, + domain, is_delete); + } + out: + return -EINVAL; +} + +/** + * tomoyo_update_single_path_acl - Update "struct tomoyo_single_path_acl_record" list. + * + * @type: Type of operation. + * @filename: Filename. + * @domain: Pointer to "struct tomoyo_domain_info". + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_update_single_path_acl(const u8 type, const char *filename, + struct tomoyo_domain_info * + const domain, const bool is_delete) +{ + static const u16 rw_mask = + (1 << TOMOYO_TYPE_READ_ACL) | (1 << TOMOYO_TYPE_WRITE_ACL); + const struct tomoyo_path_info *saved_filename; + struct tomoyo_acl_info *ptr; + struct tomoyo_single_path_acl_record *acl; + int error = -ENOMEM; + const u16 perm = 1 << type; + + if (!domain) + return -EINVAL; + if (!tomoyo_is_correct_path(filename, 0, 0, 0, __func__)) + return -EINVAL; + saved_filename = tomoyo_save_name(filename); + if (!saved_filename) + return -ENOMEM; + /***** EXCLUSIVE SECTION START *****/ + down_write(&tomoyo_domain_acl_info_list_lock); + if (is_delete) + goto delete; + list_for_each_entry(ptr, &domain->acl_info_list, list) { + if (tomoyo_acl_type1(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL) + continue; + acl = container_of(ptr, struct tomoyo_single_path_acl_record, + head); + if (acl->filename != saved_filename) + continue; + /* Special case. Clear all bits if marked as deleted. */ + if (ptr->type & TOMOYO_ACL_DELETED) + acl->perm = 0; + acl->perm |= perm; + if ((acl->perm & rw_mask) == rw_mask) + acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE_ACL; + else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL)) + acl->perm |= rw_mask; + ptr->type &= ~TOMOYO_ACL_DELETED; + error = 0; + goto out; + } + /* Not found. Append it to the tail. */ + acl = tomoyo_alloc_acl_element(TOMOYO_TYPE_SINGLE_PATH_ACL); + if (!acl) + goto out; + acl->perm = perm; + if (perm == (1 << TOMOYO_TYPE_READ_WRITE_ACL)) + acl->perm |= rw_mask; + acl->filename = saved_filename; + list_add_tail(&acl->head.list, &domain->acl_info_list); + error = 0; + goto out; + delete: + error = -ENOENT; + list_for_each_entry(ptr, &domain->acl_info_list, list) { + if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL) + continue; + acl = container_of(ptr, struct tomoyo_single_path_acl_record, + head); + if (acl->filename != saved_filename) + continue; + acl->perm &= ~perm; + if ((acl->perm & rw_mask) != rw_mask) + acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE_ACL); + else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL))) + acl->perm &= ~rw_mask; + if (!acl->perm) + ptr->type |= TOMOYO_ACL_DELETED; + error = 0; + break; + } + out: + up_write(&tomoyo_domain_acl_info_list_lock); + /***** EXCLUSIVE SECTION END *****/ + return error; +} + +/** + * tomoyo_update_double_path_acl - Update "struct tomoyo_double_path_acl_record" list. + * + * @type: Type of operation. + * @filename1: First filename. + * @filename2: Second filename. + * @domain: Pointer to "struct tomoyo_domain_info". + * @is_delete: True if it is a delete request. + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_update_double_path_acl(const u8 type, const char *filename1, + const char *filename2, + struct tomoyo_domain_info * + const domain, const bool is_delete) +{ + const struct tomoyo_path_info *saved_filename1; + const struct tomoyo_path_info *saved_filename2; + struct tomoyo_acl_info *ptr; + struct tomoyo_double_path_acl_record *acl; + int error = -ENOMEM; + const u8 perm = 1 << type; + + if (!domain) + return -EINVAL; + if (!tomoyo_is_correct_path(filename1, 0, 0, 0, __func__) || + !tomoyo_is_correct_path(filename2, 0, 0, 0, __func__)) + return -EINVAL; + saved_filename1 = tomoyo_save_name(filename1); + saved_filename2 = tomoyo_save_name(filename2); + if (!saved_filename1 || !saved_filename2) + return -ENOMEM; + /***** EXCLUSIVE SECTION START *****/ + down_write(&tomoyo_domain_acl_info_list_lock); + if (is_delete) + goto delete; + list_for_each_entry(ptr, &domain->acl_info_list, list) { + if (tomoyo_acl_type1(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL) + continue; + acl = container_of(ptr, struct tomoyo_double_path_acl_record, + head); + if (acl->filename1 != saved_filename1 || + acl->filename2 != saved_filename2) + continue; + /* Special case. Clear all bits if marked as deleted. */ + if (ptr->type & TOMOYO_ACL_DELETED) + acl->perm = 0; + acl->perm |= perm; + ptr->type &= ~TOMOYO_ACL_DELETED; + error = 0; + goto out; + } + /* Not found. Append it to the tail. */ + acl = tomoyo_alloc_acl_element(TOMOYO_TYPE_DOUBLE_PATH_ACL); + if (!acl) + goto out; + acl->perm = perm; + acl->filename1 = saved_filename1; + acl->filename2 = saved_filename2; + list_add_tail(&acl->head.list, &domain->acl_info_list); + error = 0; + goto out; + delete: + error = -ENOENT; + list_for_each_entry(ptr, &domain->acl_info_list, list) { + if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL) + continue; + acl = container_of(ptr, struct tomoyo_double_path_acl_record, + head); + if (acl->filename1 != saved_filename1 || + acl->filename2 != saved_filename2) + continue; + acl->perm &= ~perm; + if (!acl->perm) + ptr->type |= TOMOYO_ACL_DELETED; + error = 0; + break; + } + out: + up_write(&tomoyo_domain_acl_info_list_lock); + /***** EXCLUSIVE SECTION END *****/ + return error; +} + +/** + * tomoyo_check_single_path_acl - Check permission for single path operation. + * + * @domain: Pointer to "struct tomoyo_domain_info". + * @type: Type of operation. + * @filename: Filename to check. + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_check_single_path_acl(struct tomoyo_domain_info *domain, + const u8 type, + const struct tomoyo_path_info *filename) +{ + if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) + return 0; + return tomoyo_check_single_path_acl2(domain, filename, 1 << type, 1); +} + +/** + * tomoyo_check_double_path_acl - Check permission for double path operation. + * + * @domain: Pointer to "struct tomoyo_domain_info". + * @type: Type of operation. + * @filename1: First filename to check. + * @filename2: Second filename to check. + * + * Returns 0 on success, -EPERM otherwise. + */ +static int tomoyo_check_double_path_acl(const struct tomoyo_domain_info *domain, + const u8 type, + const struct tomoyo_path_info * + filename1, + const struct tomoyo_path_info * + filename2) +{ + struct tomoyo_acl_info *ptr; + const u8 perm = 1 << type; + int error = -EPERM; + + if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) + return 0; + down_read(&tomoyo_domain_acl_info_list_lock); + list_for_each_entry(ptr, &domain->acl_info_list, list) { + struct tomoyo_double_path_acl_record *acl; + if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL) + continue; + acl = container_of(ptr, struct tomoyo_double_path_acl_record, + head); + if (!(acl->perm & perm)) + continue; + if (!tomoyo_path_matches_pattern(filename1, acl->filename1)) + continue; + if (!tomoyo_path_matches_pattern(filename2, acl->filename2)) + continue; + error = 0; + break; + } + up_read(&tomoyo_domain_acl_info_list_lock); + return error; +} + +/** + * tomoyo_check_single_path_permission2 - Check permission for single path operation. + * + * @domain: Pointer to "struct tomoyo_domain_info". + * @operation: Type of operation. + * @filename: Filename to check. + * @mode: Access control mode. + * + * Returns 0 on success, negative value otherwise. + */ +static int tomoyo_check_single_path_permission2(struct tomoyo_domain_info * + const domain, u8 operation, + const struct tomoyo_path_info * + filename, const u8 mode) +{ + const char *msg; + int error; + const bool is_enforce = (mode == 3); + + if (!mode) + return 0; + next: + error = tomoyo_check_single_path_acl(domain, operation, filename); + msg = tomoyo_sp2keyword(operation); + if (!error) + goto ok; + if (tomoyo_verbose_mode(domain)) + printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n", + tomoyo_get_msg(is_enforce), msg, filename->name, + tomoyo_get_last_name(domain)); + if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { + const char *name = tomoyo_get_file_pattern(filename)->name; + tomoyo_update_single_path_acl(operation, name, domain, false); + } + if (!is_enforce) + error = 0; + ok: + /* + * Since "allow_truncate" doesn't imply "allow_rewrite" permission, + * we need to check "allow_rewrite" permission if the filename is + * specified by "deny_rewrite" keyword. + */ + if (!error && operation == TOMOYO_TYPE_TRUNCATE_ACL && + tomoyo_is_no_rewrite_file(filename)) { + operation = TOMOYO_TYPE_REWRITE_ACL; + goto next; + } + return error; +} + +/** + * tomoyo_check_file_perm - Check permission for sysctl()'s "read" and "write". + * + * @domain: Pointer to "struct tomoyo_domain_info". + * @filename: Filename to check. + * @perm: Mode ("read" or "write" or "read/write"). + * Returns 0 on success, negative value otherwise. + */ +int tomoyo_check_file_perm(struct tomoyo_domain_info *domain, + const char *filename, const u8 perm) +{ + struct tomoyo_path_info name; + const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); + + if (!mode) + return 0; + name.name = filename; + tomoyo_fill_path_info(&name); + return tomoyo_check_file_perm2(domain, &name, perm, "sysctl", mode); +} + +/** + * tomoyo_check_exec_perm - Check permission for "execute". + * + * @domain: Pointer to "struct tomoyo_domain_info". + * @filename: Check permission for "execute". + * @tmp: Buffer for temporary use. + * + * Returns 0 on success, negativevalue otherwise. + */ +int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, + const struct tomoyo_path_info *filename, + struct tomoyo_page_buffer *tmp) +{ + const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); + + if (!mode) + return 0; + return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode); +} + +/** + * tomoyo_check_open_permission - Check permission for "read" and "write". + * + * @domain: Pointer to "struct tomoyo_domain_info". + * @path: Pointer to "struct path". + * @flag: Flags for open(). + * + * Returns 0 on success, negative value otherwise. + */ +int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, + struct path *path, const int flag) +{ + const u8 acc_mode = ACC_MODE(flag); + int error = -ENOMEM; + struct tomoyo_path_info *buf; + const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); + const bool is_enforce = (mode == 3); + + if (!mode || !path->mnt) + return 0; + if (acc_mode == 0) + return 0; + if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) + /* + * I don't check directories here because mkdir() and rmdir() + * don't call me. + */ + return 0; + buf = tomoyo_get_path(path); + if (!buf) + goto out; + error = 0; + /* + * If the filename is specified by "deny_rewrite" keyword, + * we need to check "allow_rewrite" permission when the filename is not + * opened for append mode or the filename is truncated at open time. + */ + if ((acc_mode & MAY_WRITE) && + ((flag & O_TRUNC) || !(flag & O_APPEND)) && + (tomoyo_is_no_rewrite_file(buf))) { + error = tomoyo_check_single_path_permission2(domain, + TOMOYO_TYPE_REWRITE_ACL, + buf, mode); + } + if (!error) + error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open", + mode); + if (!error && (flag & O_TRUNC)) + error = tomoyo_check_single_path_permission2(domain, + TOMOYO_TYPE_TRUNCATE_ACL, + buf, mode); + out: + tomoyo_free(buf); + if (!is_enforce) + error = 0; + return error; +} + +/** + * tomoyo_check_1path_perm - Check permission for "create", "unlink", "mkdir", "rmdir", "mkfifo", "mksock", "mkblock", "mkchar", "truncate" and "symlink". + * + * @domain: Pointer to "struct tomoyo_domain_info". + * @operation: Type of operation. + * @path: Pointer to "struct path". + * + * Returns 0 on success, negative value otherwise. + */ +int tomoyo_check_1path_perm(struct tomoyo_domain_info *domain, + const u8 operation, struct path *path) +{ + int error = -ENOMEM; + struct tomoyo_path_info *buf; + const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); + const bool is_enforce = (mode == 3); + + if (!mode || !path->mnt) + return 0; + buf = tomoyo_get_path(path); + if (!buf) + goto out; + switch (operation) { + case TOMOYO_TYPE_MKDIR_ACL: + case TOMOYO_TYPE_RMDIR_ACL: + if (!buf->is_dir) { + /* + * tomoyo_get_path() reserves space for appending "/." + */ + strcat((char *) buf->name, "/"); + tomoyo_fill_path_info(buf); + } + } + error = tomoyo_check_single_path_permission2(domain, operation, buf, + mode); + out: + tomoyo_free(buf); + if (!is_enforce) + error = 0; + return error; +} + +/** + * tomoyo_check_rewrite_permission - Check permission for "rewrite". + * + * @domain: Pointer to "struct tomoyo_domain_info". + * @filp: Pointer to "struct file". + * + * Returns 0 on success, negative value otherwise. + */ +int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain, + struct file *filp) +{ + int error = -ENOMEM; + const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); + const bool is_enforce = (mode == 3); + struct tomoyo_path_info *buf; + + if (!mode || !filp->f_path.mnt) + return 0; + buf = tomoyo_get_path(&filp->f_path); + if (!buf) + goto out; + if (!tomoyo_is_no_rewrite_file(buf)) { + error = 0; + goto out; + } + error = tomoyo_check_single_path_permission2(domain, + TOMOYO_TYPE_REWRITE_ACL, + buf, mode); + out: + tomoyo_free(buf); + if (!is_enforce) + error = 0; + return error; +} + +/** + * tomoyo_check_2path_perm - Check permission for "rename" and "link". + * + * @domain: Pointer to "struct tomoyo_domain_info". + * @operation: Type of operation. + * @path1: Pointer to "struct path". + * @path2: Pointer to "struct path". + * + * Returns 0 on success, negative value otherwise. + */ +int tomoyo_check_2path_perm(struct tomoyo_domain_info * const domain, + const u8 operation, struct path *path1, + struct path *path2) +{ + int error = -ENOMEM; + struct tomoyo_path_info *buf1, *buf2; + const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); + const bool is_enforce = (mode == 3); + const char *msg; + + if (!mode || !path1->mnt || !path2->mnt) + return 0; + buf1 = tomoyo_get_path(path1); + buf2 = tomoyo_get_path(path2); + if (!buf1 || !buf2) + goto out; + { + struct dentry *dentry = path1->dentry; + if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { + /* + * tomoyo_get_path() reserves space for appending "/." + */ + if (!buf1->is_dir) { + strcat((char *) buf1->name, "/"); + tomoyo_fill_path_info(buf1); + } + if (!buf2->is_dir) { + strcat((char *) buf2->name, "/"); + tomoyo_fill_path_info(buf2); + } + } + } + error = tomoyo_check_double_path_acl(domain, operation, buf1, buf2); + msg = tomoyo_dp2keyword(operation); + if (!error) + goto out; + if (tomoyo_verbose_mode(domain)) + printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' " + "denied for %s\n", tomoyo_get_msg(is_enforce), + msg, buf1->name, buf2->name, + tomoyo_get_last_name(domain)); + if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { + const char *name1 = tomoyo_get_file_pattern(buf1)->name; + const char *name2 = tomoyo_get_file_pattern(buf2)->name; + tomoyo_update_double_path_acl(operation, name1, name2, domain, + false); + } + out: + tomoyo_free(buf1); + tomoyo_free(buf2); + if (!is_enforce) + error = 0; + return error; +} diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c new file mode 100644 index 0000000..d47f16b --- /dev/null +++ b/security/tomoyo/realpath.c @@ -0,0 +1,482 @@ +/* + * security/tomoyo/realpath.c + * + * Get the canonicalized absolute pathnames. The basis for TOMOYO. + * + * Copyright (C) 2005-2009 NTT DATA CORPORATION + * + * Version: 2.2.0-pre 2009/02/01 + * + */ + +#include <linux/types.h> +#include <linux/mount.h> +#include <linux/mnt_namespace.h> +#include "common.h" +#include "realpath.h" + +/** + * tomoyo_encode: Convert binary string to ascii string. + * + * @buffer: Buffer for ASCII string. + * @buflen: Size of @buffer. + * @str: Binary string. + * + * Returns 0 on success, -ENOMEM otherwise. + */ +int tomoyo_encode(char *buffer, int buflen, const char *str) +{ + while (1) { + const unsigned char c = *(unsigned char *) str++; + + if (tomoyo_is_valid(c)) { + if (--buflen <= 0) + break; + *buffer++ = (char) c; + if (c != '\\') + continue; + if (--buflen <= 0) + break; + *buffer++ = (char) c; + continue; + } + if (!c) { + if (--buflen <= 0) + break; + *buffer = '\0'; + return 0; + } + buflen -= 4; + if (buflen <= 0) + break; + *buffer++ = '\\'; + *buffer++ = (c >> 6) + '0'; + *buffer++ = ((c >> 3) & 7) + '0'; + *buffer++ = (c & 7) + '0'; + } + return -ENOMEM; +} + +/** + * tomoyo_realpath_from_path2 - Returns realpath(3) of the given dentry but ignores chroot'ed root. + * + * @path: Pointer to "struct path". + * @newname: Pointer to buffer to return value in. + * @newname_len: Size of @newname. + * + * Returns 0 on success, negative value otherwise. + * + * If dentry is a directory, trailing '/' is appended. + * Characters out of 0x20 < c < 0x7F range are converted to + * \ooo style octal string. + * Character \ is converted to \\ string. + */ +int tomoyo_realpath_from_path2(struct path *path, char *newname, + int newname_len) +{ + int error = -ENOMEM; + struct dentry *dentry = path->dentry; + char *sp; + + if (!dentry || !path->mnt || !newname || newname_len <= 2048) + return -EINVAL; + if (dentry->d_op && dentry->d_op->d_dname) { + /* For "socket:[\$]" and "pipe:[\$]". */ + static const int offset = 1536; + sp = dentry->d_op->d_dname(dentry, newname + offset, + newname_len - offset); + } else { + /* Taken from d_namespace_path(). */ + struct path root; + struct path ns_root = { }; + struct path tmp; + + read_lock(¤t->fs->lock); + root = current->fs->root; + path_get(&root); + read_unlock(¤t->fs->lock); + spin_lock(&vfsmount_lock); + if (root.mnt && root.mnt->mnt_ns) + ns_root.mnt = mntget(root.mnt->mnt_ns->root); + if (ns_root.mnt) + ns_root.dentry = dget(ns_root.mnt->mnt_root); + spin_unlock(&vfsmount_lock); + spin_lock(&dcache_lock); + tmp = ns_root; + sp = __d_path(path, &tmp, newname, newname_len); + spin_unlock(&dcache_lock); + path_put(&root); + path_put(&ns_root); + } + if (IS_ERR(sp)) + error = PTR_ERR(sp); + else + error = tomoyo_encode(newname, sp - newname, sp); + /* Append trailing '/' if dentry is a directory. */ + if (!error && dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode) + && *newname) { + sp = newname + strlen(newname); + if (*(sp - 1) != '/') { + if (sp < newname + newname_len - 4) { + *sp++ = '/'; + *sp = '\0'; + } else { + error = -ENOMEM; + } + } + } + if (error) + printk(KERN_WARNING "tomoyo_realpath: Pathname too long.\n"); + return error; +} + +/** + * tomoyo_realpath_from_path - Returns realpath(3) of the given pathname but ignores chroot'ed root. + * + * @path: Pointer to "struct path". + * + * Returns the realpath of the given @path on success, NULL otherwise. + * + * These functions use tomoyo_alloc(), so the caller must call tomoyo_free() + * if these functions didn't return NULL. + */ +char *tomoyo_realpath_from_path(struct path *path) +{ + char *buf = tomoyo_alloc(sizeof(struct tomoyo_page_buffer)); + + BUILD_BUG_ON(sizeof(struct tomoyo_page_buffer) + <= TOMOYO_MAX_PATHNAME_LEN - 1); + if (!buf) + return NULL; + if (tomoyo_realpath_from_path2(path, buf, + TOMOYO_MAX_PATHNAME_LEN - 1) == 0) + return buf; + tomoyo_free(buf); + return NULL; +} + +/** + * tomoyo_realpath - Get realpath of a pathname. + * + * @pathname: The pathname to solve. + * + * Returns the realpath of @pathname on success, NULL otherwise. + */ +char *tomoyo_realpath(const char *pathname) +{ + struct nameidata nd; + + if (pathname && path_lookup(pathname, LOOKUP_FOLLOW, &nd) == 0) { + char *buf = tomoyo_realpath_from_path(&nd.path); + path_put(&nd.path); + return buf; + } + return NULL; +} + +/** + * tomoyo_realpath_nofollow - Get realpath of a pathname. + * + * @pathname: The pathname to solve. + * + * Returns the realpath of @pathname on success, NULL otherwise. + */ +char *tomoyo_realpath_nofollow(const char *pathname) +{ + struct nameidata nd; + + if (pathname && path_lookup(pathname, 0, &nd) == 0) { + char *buf = tomoyo_realpath_from_path(&nd.path); + path_put(&nd.path); + return buf; + } + return NULL; +} + +/* Memory allocated for non-string data. */ +static unsigned int tomoyo_allocated_memory_for_elements; +/* Quota for holding non-string data. */ +static unsigned int tomoyo_quota_for_elements; + +/** + * tomoyo_alloc_element - Allocate permanent memory for structures. + * + * @size: Size in bytes. + * + * Returns pointer to allocated memory on success, NULL otherwise. + * + * Memory has to be zeroed. + * The RAM is chunked, so NEVER try to kfree() the returned pointer. + */ +void *tomoyo_alloc_element(const unsigned int size) +{ + static char *buf; + static DEFINE_MUTEX(lock); + static unsigned int buf_used_len = PATH_MAX; + char *ptr = NULL; + /*Assumes sizeof(void *) >= sizeof(long) is true. */ + const unsigned int word_aligned_size + = roundup(size, max(sizeof(void *), sizeof(long))); + if (word_aligned_size > PATH_MAX) + return NULL; + /***** EXCLUSIVE SECTION START *****/ + mutex_lock(&lock); + if (buf_used_len + word_aligned_size > PATH_MAX) { + if (!tomoyo_quota_for_elements || + tomoyo_allocated_memory_for_elements + + PATH_MAX <= tomoyo_quota_for_elements) + ptr = kzalloc(PATH_MAX, GFP_KERNEL); + if (!ptr) { + printk(KERN_WARNING "ERROR: Out of memory " + "for tomoyo_alloc_element().\n"); + if (!tomoyo_policy_loaded) + panic("MAC Initialization failed.\n"); + } else { + buf = ptr; + tomoyo_allocated_memory_for_elements += PATH_MAX; + buf_used_len = word_aligned_size; + ptr = buf; + } + } else if (word_aligned_size) { + int i; + ptr = buf + buf_used_len; + buf_used_len += word_aligned_size; + for (i = 0; i < word_aligned_size; i++) { + if (!ptr[i]) + continue; + printk(KERN_ERR "WARNING: Reserved memory was tainted! " + "The system might go wrong.\n"); + ptr[i] = '\0'; + } + } + mutex_unlock(&lock); + /***** EXCLUSIVE SECTION END *****/ + return ptr; +} + +/* Memory allocated for string data in bytes. */ +static unsigned int tomoyo_allocated_memory_for_savename; +/* Quota for holding string data in bytes. */ +static unsigned int tomoyo_quota_for_savename; + +/* + * TOMOYO uses this hash only when appending a string into the string + * table. Frequency of appending strings is very low. So we don't need + * large (e.g. 64k) hash size. 256 will be sufficient. + */ +#define TOMOYO_MAX_HASH 256 + +/* Structure for string data. */ +struct tomoyo_name_entry { + struct list_head list; + struct tomoyo_path_info entry; +}; + +/* Structure for available memory region. */ +struct tomoyo_free_memory_block_list { + struct list_head list; + char *ptr; /* Pointer to a free area. */ + int len; /* Length of the area. */ +}; + +/* + * The list for "struct tomoyo_name_entry". + * + * This list is updated only inside tomoyo_save_name(), thus + * no global mutex exists. + */ +static struct list_head tomoyo_name_list[TOMOYO_MAX_HASH]; + +/** + * tomoyo_save_name - Allocate permanent memory for string data. + * + * @name: The string to store into the permernent memory. + * + * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise. + * + * The RAM is shared, so NEVER try to modify or kfree() the returned name. + */ +const struct tomoyo_path_info *tomoyo_save_name(const char *name) +{ + static LIST_HEAD(fmb_list); + static DEFINE_MUTEX(lock); + struct tomoyo_name_entry *ptr; + unsigned int hash; + /* fmb contains available size in bytes. + fmb is removed from the fmb_list when fmb->len becomes 0. */ + struct tomoyo_free_memory_block_list *fmb; + int len; + char *cp; + + if (!name) + return NULL; + len = strlen(name) + 1; + if (len > TOMOYO_MAX_PATHNAME_LEN) { + printk(KERN_WARNING "ERROR: Name too long " + "for tomoyo_save_name().\n"); + return NULL; + } + hash = full_name_hash((const unsigned char *) name, len - 1); + /***** EXCLUSIVE SECTION START *****/ + mutex_lock(&lock); + list_for_each_entry(ptr, &tomoyo_name_list[hash % TOMOYO_MAX_HASH], + list) { + if (hash == ptr->entry.hash && !strcmp(name, ptr->entry.name)) + goto out; + } + list_for_each_entry(fmb, &fmb_list, list) { + if (len <= fmb->len) + goto ready; + } + if (!tomoyo_quota_for_savename || + tomoyo_allocated_memory_for_savename + PATH_MAX + <= tomoyo_quota_for_savename) + cp = kzalloc(PATH_MAX, GFP_KERNEL); + else + cp = NULL; + fmb = kzalloc(sizeof(*fmb), GFP_KERNEL); + if (!cp || !fmb) { + kfree(cp); + kfree(fmb); + printk(KERN_WARNING "ERROR: Out of memory " + "for tomoyo_save_name().\n"); + if (!tomoyo_policy_loaded) + panic("MAC Initialization failed.\n"); + ptr = NULL; + goto out; + } + tomoyo_allocated_memory_for_savename += PATH_MAX; + list_add(&fmb->list, &fmb_list); + fmb->ptr = cp; + fmb->len = PATH_MAX; + ready: + ptr = tomoyo_alloc_element(sizeof(*ptr)); + if (!ptr) + goto out; + ptr->entry.name = fmb->ptr; + memmove(fmb->ptr, name, len); + tomoyo_fill_path_info(&ptr->entry); + fmb->ptr += len; + fmb->len -= len; + list_add_tail(&ptr->list, &tomoyo_name_list[hash % TOMOYO_MAX_HASH]); + if (fmb->len == 0) { + list_del(&fmb->list); + kfree(fmb); + } + out: + mutex_unlock(&lock); + /***** EXCLUSIVE SECTION END *****/ + return ptr ? &ptr->entry : NULL; +} + +/** + * tomoyo_realpath_init - Initialize realpath related code. + */ +void __init tomoyo_realpath_init(void) +{ + int i; + + BUILD_BUG_ON(TOMOYO_MAX_PATHNAME_LEN > PATH_MAX); + for (i = 0; i < TOMOYO_MAX_HASH; i++) + INIT_LIST_HEAD(&tomoyo_name_list[i]); + INIT_LIST_HEAD(&tomoyo_kernel_domain.acl_info_list); + tomoyo_kernel_domain.domainname = tomoyo_save_name(TOMOYO_ROOT_NAME); + list_add_tail(&tomoyo_kernel_domain.list, &tomoyo_domain_list); + down_read(&tomoyo_domain_list_lock); + if (tomoyo_find_domain(TOMOYO_ROOT_NAME) != &tomoyo_kernel_domain) + panic("Can't register tomoyo_kernel_domain"); + up_read(&tomoyo_domain_list_lock); +} + +/* Memory allocated for temporary purpose. */ +static atomic_t tomoyo_dynamic_memory_size; + +/** + * tomoyo_alloc - Allocate memory for temporary purpose. + * + * @size: Size in bytes. + * + * Returns pointer to allocated memory on success, NULL otherwise. + */ +void *tomoyo_alloc(const size_t size) +{ + void *p = kzalloc(size, GFP_KERNEL); + if (p) + atomic_add(ksize(p), &tomoyo_dynamic_memory_size); + return p; +} + +/** + * tomoyo_free - Release memory allocated by tomoyo_alloc(). + * + * @p: Pointer returned by tomoyo_alloc(). May be NULL. + * + * Returns nothing. + */ +void tomoyo_free(const void *p) +{ + if (p) { + atomic_sub(ksize(p), &tomoyo_dynamic_memory_size); + kfree(p); + } +} + +/** + * tomoyo_read_memory_counter - Check for memory usage in bytes. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns memory usage. + */ +int tomoyo_read_memory_counter(struct tomoyo_io_buffer *head) +{ + if (!head->read_eof) { + const unsigned int shared + = tomoyo_allocated_memory_for_savename; + const unsigned int private + = tomoyo_allocated_memory_for_elements; + const unsigned int dynamic + = atomic_read(&tomoyo_dynamic_memory_size); + char buffer[64]; + + memset(buffer, 0, sizeof(buffer)); + if (tomoyo_quota_for_savename) + snprintf(buffer, sizeof(buffer) - 1, + " (Quota: %10u)", + tomoyo_quota_for_savename); + else + buffer[0] = '\0'; + tomoyo_io_printf(head, "Shared: %10u%s\n", shared, buffer); + if (tomoyo_quota_for_elements) + snprintf(buffer, sizeof(buffer) - 1, + " (Quota: %10u)", + tomoyo_quota_for_elements); + else + buffer[0] = '\0'; + tomoyo_io_printf(head, "Private: %10u%s\n", private, buffer); + tomoyo_io_printf(head, "Dynamic: %10u\n", dynamic); + tomoyo_io_printf(head, "Total: %10u\n", + shared + private + dynamic); + head->read_eof = true; + } + return 0; +} + +/** + * tomoyo_write_memory_quota - Set memory quota. + * + * @head: Pointer to "struct tomoyo_io_buffer". + * + * Returns 0. + */ +int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head) +{ + char *data = head->write_buf; + unsigned int size; + + if (sscanf(data, "Shared: %u", &size) == 1) + tomoyo_quota_for_savename = size; + else if (sscanf(data, "Private: %u", &size) == 1) + tomoyo_quota_for_elements = size; + return 0; +} diff --git a/security/tomoyo/realpath.h b/security/tomoyo/realpath.h new file mode 100644 index 0000000..7ec9fc9c --- /dev/null +++ b/security/tomoyo/realpath.h @@ -0,0 +1,66 @@ +/* + * security/tomoyo/realpath.h + * + * Get the canonicalized absolute pathnames. The basis for TOMOYO. + * + * Copyright (C) 2005-2009 NTT DATA CORPORATION + * + * Version: 2.2.0-pre 2009/02/01 + * + */ + +#ifndef _SECURITY_TOMOYO_REALPATH_H +#define _SECURITY_TOMOYO_REALPATH_H + +struct path; +struct tomoyo_path_info; +struct tomoyo_io_buffer; + +/* Convert binary string to ascii string. */ +int tomoyo_encode(char *buffer, int buflen, const char *str); + +/* Returns realpath(3) of the given pathname but ignores chroot'ed root. */ +int tomoyo_realpath_from_path2(struct path *path, char *newname, + int newname_len); + +/* + * Returns realpath(3) of the given pathname but ignores chroot'ed root. + * These functions use tomoyo_alloc(), so the caller must call tomoyo_free() + * if these functions didn't return NULL. + */ +char *tomoyo_realpath(const char *pathname); +/* + * Same with tomoyo_realpath() except that it doesn't follow the final symlink. + */ +char *tomoyo_realpath_nofollow(const char *pathname); +/* Same with tomoyo_realpath() except that the pathname is already solved. */ +char *tomoyo_realpath_from_path(struct path *path); + +/* + * Allocate memory for ACL entry. + * The RAM is chunked, so NEVER try to kfree() the returned pointer. + */ +void *tomoyo_alloc_element(const unsigned int size); + +/* + * Keep the given name on the RAM. + * The RAM is shared, so NEVER try to modify or kfree() the returned name. + */ +const struct tomoyo_path_info *tomoyo_save_name(const char *name); + +/* Allocate memory for temporary use (e.g. permission checks). */ +void *tomoyo_alloc(const size_t size); + +/* Free memory allocated by tomoyo_alloc(). */ +void tomoyo_free(const void *p); + +/* Check for memory usage. */ +int tomoyo_read_memory_counter(struct tomoyo_io_buffer *head); + +/* Set memory quota. */ +int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head); + +/* Initialize realpath related code. */ +void __init tomoyo_realpath_init(void); + +#endif /* !defined(_SECURITY_TOMOYO_REALPATH_H) */ diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c new file mode 100644 index 0000000..3eeeae1 --- /dev/null +++ b/security/tomoyo/tomoyo.c @@ -0,0 +1,294 @@ +/* + * security/tomoyo/tomoyo.c + * + * LSM hooks for TOMOYO Linux. + * + * Copyright (C) 2005-2009 NTT DATA CORPORATION + * + * Version: 2.2.0-pre 2009/02/01 + * + */ + +#include <linux/security.h> +#include "common.h" +#include "tomoyo.h" +#include "realpath.h" + +static int tomoyo_cred_prepare(struct cred *new, const struct cred *old, + gfp_t gfp) +{ + /* + * Since "struct tomoyo_domain_info *" is a sharable pointer, + * we don't need to duplicate. + */ + new->security = old->security; + return 0; +} + +static int tomoyo_bprm_set_creds(struct linux_binprm *bprm) +{ + /* + * Do only if this function is called for the first time of an execve + * operation. + */ + if (bprm->cred_prepared) + return 0; + /* + * Load policy if /sbin/tomoyo-init exists and /sbin/init is requested + * for the first time. + */ + if (!tomoyo_policy_loaded) + tomoyo_load_policy(bprm->filename); + /* + * Tell tomoyo_bprm_check_security() is called for the first time of an + * execve operation. + */ + bprm->cred->security = NULL; + return 0; +} + +static int tomoyo_bprm_check_security(struct linux_binprm *bprm) +{ + struct tomoyo_domain_info *domain = bprm->cred->security; + + /* + * Execute permission is checked against pathname passed to do_execve() + * using current domain. + */ + if (!domain) { + struct tomoyo_domain_info *next_domain = NULL; + int retval = tomoyo_find_next_domain(bprm, &next_domain); + + if (!retval) + bprm->cred->security = next_domain; + return retval; + } + /* + * Read permission is checked against interpreters using next domain. + * '1' is the result of open_to_namei_flags(O_RDONLY). + */ + return tomoyo_check_open_permission(domain, &bprm->file->f_path, 1); +} + +#ifdef CONFIG_SYSCTL + +static int tomoyo_prepend(char **buffer, int *buflen, const char *str) +{ + int namelen = strlen(str); + + if (*buflen < namelen) + return -ENOMEM; + *buflen -= namelen; + *buffer -= namelen; + memcpy(*buffer, str, namelen); + return 0; +} + +/** + * tomoyo_sysctl_path - return the realpath of a ctl_table. + * @table: pointer to "struct ctl_table". + * + * Returns realpath(3) of the @table on success. + * Returns NULL on failure. + * + * This function uses tomoyo_alloc(), so the caller must call tomoyo_free() + * if this function didn't return NULL. + */ +static char *tomoyo_sysctl_path(struct ctl_table *table) +{ + int buflen = TOMOYO_MAX_PATHNAME_LEN; + char *buf = tomoyo_alloc(buflen); + char *end = buf + buflen; + int error = -ENOMEM; + + if (!buf) + return NULL; + + *--end = '\0'; + buflen--; + while (table) { + char num[32]; + const char *sp = table->procname; + + if (!sp) { + memset(num, 0, sizeof(num)); + snprintf(num, sizeof(num) - 1, "=%d=", table->ctl_name); + sp = num; + } + if (tomoyo_prepend(&end, &buflen, sp) || + tomoyo_prepend(&end, &buflen, "/")) + goto out; + table = table->parent; + } + if (tomoyo_prepend(&end, &buflen, "/proc/sys")) + goto out; + error = tomoyo_encode(buf, end - buf, end); + out: + if (!error) + return buf; + tomoyo_free(buf); + return NULL; +} + +static int tomoyo_sysctl(struct ctl_table *table, int op) +{ + int error; + char *name; + + op &= MAY_READ | MAY_WRITE; + if (!op) + return 0; + name = tomoyo_sysctl_path(table); + if (!name) + return -ENOMEM; + error = tomoyo_check_file_perm(tomoyo_domain(), name, op); + tomoyo_free(name); + return error; +} +#endif + +static int tomoyo_path_truncate(struct path *path, loff_t length, + unsigned int time_attrs) +{ + return tomoyo_check_1path_perm(tomoyo_domain(), + TOMOYO_TYPE_TRUNCATE_ACL, + path); +} + +static int tomoyo_path_unlink(struct path *parent, struct dentry *dentry) +{ + struct path path = { parent->mnt, dentry }; + return tomoyo_check_1path_perm(tomoyo_domain(), + TOMOYO_TYPE_UNLINK_ACL, + &path); +} + +static int tomoyo_path_mkdir(struct path *parent, struct dentry *dentry, + int mode) +{ + struct path path = { parent->mnt, dentry }; + return tomoyo_check_1path_perm(tomoyo_domain(), + TOMOYO_TYPE_MKDIR_ACL, + &path); +} + +static int tomoyo_path_rmdir(struct path *parent, struct dentry *dentry) +{ + struct path path = { parent->mnt, dentry }; + return tomoyo_check_1path_perm(tomoyo_domain(), + TOMOYO_TYPE_RMDIR_ACL, + &path); +} + +static int tomoyo_path_symlink(struct path *parent, struct dentry *dentry, + const char *old_name) +{ + struct path path = { parent->mnt, dentry }; + return tomoyo_check_1path_perm(tomoyo_domain(), + TOMOYO_TYPE_SYMLINK_ACL, + &path); +} + +static int tomoyo_path_mknod(struct path *parent, struct dentry *dentry, + int mode, unsigned int dev) +{ + struct path path = { parent->mnt, dentry }; + int type = TOMOYO_TYPE_CREATE_ACL; + + switch (mode & S_IFMT) { + case S_IFCHR: + type = TOMOYO_TYPE_MKCHAR_ACL; + break; + case S_IFBLK: + type = TOMOYO_TYPE_MKBLOCK_ACL; + break; + case S_IFIFO: + type = TOMOYO_TYPE_MKFIFO_ACL; + break; + case S_IFSOCK: + type = TOMOYO_TYPE_MKSOCK_ACL; + break; + } + return tomoyo_check_1path_perm(tomoyo_domain(), + type, &path); +} + +static int tomoyo_path_link(struct dentry *old_dentry, struct path *new_dir, + struct dentry *new_dentry) +{ + struct path path1 = { new_dir->mnt, old_dentry }; + struct path path2 = { new_dir->mnt, new_dentry }; + return tomoyo_check_2path_perm(tomoyo_domain(), + TOMOYO_TYPE_LINK_ACL, + &path1, &path2); +} + +static int tomoyo_path_rename(struct path *old_parent, + struct dentry *old_dentry, + struct path *new_parent, + struct dentry *new_dentry) +{ + struct path path1 = { old_parent->mnt, old_dentry }; + struct path path2 = { new_parent->mnt, new_dentry }; + return tomoyo_check_2path_perm(tomoyo_domain(), + TOMOYO_TYPE_RENAME_ACL, + &path1, &path2); +} + +static int tomoyo_file_fcntl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + if (cmd == F_SETFL && ((arg ^ file->f_flags) & O_APPEND)) + return tomoyo_check_rewrite_permission(tomoyo_domain(), file); + return 0; +} + +static int tomoyo_dentry_open(struct file *f, const struct cred *cred) +{ + int flags = f->f_flags; + + if ((flags + 1) & O_ACCMODE) + flags++; + flags |= f->f_flags & (O_APPEND | O_TRUNC); + /* Don't check read permission here if called from do_execve(). */ + if (current->in_execve) + return 0; + return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path, flags); +} + +static struct security_operations tomoyo_security_ops = { + .name = "tomoyo", + .cred_prepare = tomoyo_cred_prepare, + .bprm_set_creds = tomoyo_bprm_set_creds, + .bprm_check_security = tomoyo_bprm_check_security, +#ifdef CONFIG_SYSCTL + .sysctl = tomoyo_sysctl, +#endif + .file_fcntl = tomoyo_file_fcntl, + .dentry_open = tomoyo_dentry_open, + .path_truncate = tomoyo_path_truncate, + .path_unlink = tomoyo_path_unlink, + .path_mkdir = tomoyo_path_mkdir, + .path_rmdir = tomoyo_path_rmdir, + .path_symlink = tomoyo_path_symlink, + .path_mknod = tomoyo_path_mknod, + .path_link = tomoyo_path_link, + .path_rename = tomoyo_path_rename, +}; + +static int __init tomoyo_init(void) +{ + struct cred *cred = (struct cred *) current_cred(); + + if (!security_module_enable(&tomoyo_security_ops)) + return 0; + /* register ourselves with the security framework */ + if (register_security(&tomoyo_security_ops)) + panic("Failure registering TOMOYO Linux"); + printk(KERN_INFO "TOMOYO Linux initialized\n"); + cred->security = &tomoyo_kernel_domain; + tomoyo_realpath_init(); + return 0; +} + +security_initcall(tomoyo_init); diff --git a/security/tomoyo/tomoyo.h b/security/tomoyo/tomoyo.h new file mode 100644 index 0000000..a0c8f6e --- /dev/null +++ b/security/tomoyo/tomoyo.h @@ -0,0 +1,106 @@ +/* + * security/tomoyo/tomoyo.h + * + * Implementation of the Domain-Based Mandatory Access Control. + * + * Copyright (C) 2005-2009 NTT DATA CORPORATION + * + * Version: 2.2.0-pre 2009/02/01 + * + */ + +#ifndef _SECURITY_TOMOYO_TOMOYO_H +#define _SECURITY_TOMOYO_TOMOYO_H + +struct tomoyo_path_info; +struct path; +struct inode; +struct linux_binprm; +struct pt_regs; +struct tomoyo_page_buffer; + +int tomoyo_check_file_perm(struct tomoyo_domain_info *domain, + const char *filename, const u8 perm); +int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, + const struct tomoyo_path_info *filename, + struct tomoyo_page_buffer *buf); +int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, + struct path *path, const int flag); +int tomoyo_check_1path_perm(struct tomoyo_domain_info *domain, + const u8 operation, struct path *path); +int tomoyo_check_2path_perm(struct tomoyo_domain_info *domain, + const u8 operation, struct path *path1, + struct path *path2); +int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain, + struct file *filp); +int tomoyo_find_next_domain(struct linux_binprm *bprm, + struct tomoyo_domain_info **next_domain); + +/* Index numbers for Access Controls. */ + +#define TOMOYO_TYPE_SINGLE_PATH_ACL 0 +#define TOMOYO_TYPE_DOUBLE_PATH_ACL 1 + +/* Index numbers for File Controls. */ + +/* + * TYPE_READ_WRITE_ACL is special. TYPE_READ_WRITE_ACL is automatically set + * if both TYPE_READ_ACL and TYPE_WRITE_ACL are set. Both TYPE_READ_ACL and + * TYPE_WRITE_ACL are automatically set if TYPE_READ_WRITE_ACL is set. + * TYPE_READ_WRITE_ACL is automatically cleared if either TYPE_READ_ACL or + * TYPE_WRITE_ACL is cleared. Both TYPE_READ_ACL and TYPE_WRITE_ACL are + * automatically cleared if TYPE_READ_WRITE_ACL is cleared. + */ + +#define TOMOYO_TYPE_READ_WRITE_ACL 0 +#define TOMOYO_TYPE_EXECUTE_ACL 1 +#define TOMOYO_TYPE_READ_ACL 2 +#define TOMOYO_TYPE_WRITE_ACL 3 +#define TOMOYO_TYPE_CREATE_ACL 4 +#define TOMOYO_TYPE_UNLINK_ACL 5 +#define TOMOYO_TYPE_MKDIR_ACL 6 +#define TOMOYO_TYPE_RMDIR_ACL 7 +#define TOMOYO_TYPE_MKFIFO_ACL 8 +#define TOMOYO_TYPE_MKSOCK_ACL 9 +#define TOMOYO_TYPE_MKBLOCK_ACL 10 +#define TOMOYO_TYPE_MKCHAR_ACL 11 +#define TOMOYO_TYPE_TRUNCATE_ACL 12 +#define TOMOYO_TYPE_SYMLINK_ACL 13 +#define TOMOYO_TYPE_REWRITE_ACL 14 +#define TOMOYO_MAX_SINGLE_PATH_OPERATION 15 + +#define TOMOYO_TYPE_LINK_ACL 0 +#define TOMOYO_TYPE_RENAME_ACL 1 +#define TOMOYO_MAX_DOUBLE_PATH_OPERATION 2 + +#define TOMOYO_DOMAINPOLICY 0 +#define TOMOYO_EXCEPTIONPOLICY 1 +#define TOMOYO_DOMAIN_STATUS 2 +#define TOMOYO_PROCESS_STATUS 3 +#define TOMOYO_MEMINFO 4 +#define TOMOYO_SELFDOMAIN 5 +#define TOMOYO_VERSION 6 +#define TOMOYO_PROFILE 7 +#define TOMOYO_MANAGER 8 + +extern struct tomoyo_domain_info tomoyo_kernel_domain; + +static inline struct tomoyo_domain_info *tomoyo_domain(void) +{ + return current_cred()->security; +} + +/* Caller holds tasklist_lock spinlock. */ +static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct + *task) +{ + /***** CRITICAL SECTION START *****/ + const struct cred *cred = get_task_cred(task); + struct tomoyo_domain_info *domain = cred->security; + + put_cred(cred); + return domain; + /***** CRITICAL SECTION END *****/ +} + +#endif /* !defined(_SECURITY_TOMOYO_TOMOYO_H) */ |
