/* audit -- definition of audit_context structure and supporting types * * Copyright 2003-2004 Red Hat, Inc. * Copyright 2005 Hewlett-Packard Development Company, L.P. * Copyright 2005 IBM Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/fs.h> #include <linux/audit.h> #include <linux/skbuff.h> #include <uapi/linux/mqueue.h> /* 0 = no checking 1 = put_count checking 2 = verbose put_count checking */ #define AUDIT_DEBUG 0 /* AUDIT_NAMES is the number of slots we reserve in the audit_context * for saving names from getname(). If we get more names we will allocate * a name dynamically and also add those to the list anchored by names_list. */ #define AUDIT_NAMES 5 /* At task start time, the audit_state is set in the audit_context using a per-task filter. At syscall entry, the audit_state is augmented by the syscall filter. */ enum audit_state { AUDIT_DISABLED, /* Do not create per-task audit_context. * No syscall-specific audit records can * be generated. */ AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context, * and fill it in at syscall * entry time. This makes a full * syscall record available if some * other part of the kernel decides it * should be recorded. */ AUDIT_RECORD_CONTEXT /* Create the per-task audit_context, * always fill it in at syscall entry * time, and always write out the audit * record at syscall exit time. */ }; /* Rule lists */ struct audit_watch; struct audit_tree; struct audit_chunk; struct audit_entry { struct list_head list; struct rcu_head rcu; struct audit_krule rule; }; struct audit_cap_data { kernel_cap_t permitted; kernel_cap_t inheritable; union { unsigned int fE; /* effective bit of file cap */ kernel_cap_t effective; /* effective set of process */ }; }; /* When fs/namei.c:getname() is called, we store the pointer in name and * we don't let putname() free it (instead we free all of the saved * pointers at syscall exit time). * * Further, in fs/namei.c:path_lookup() we store the inode and device. */ struct audit_names { struct list_head list; /* audit_context->names_list */ struct filename *name; int name_len; /* number of chars to log */ bool hidden; /* don't log this record */ bool name_put; /* call __putname()? */ unsigned long ino; dev_t dev; umode_t mode; kuid_t uid; kgid_t gid; dev_t rdev; u32 osid; struct audit_cap_data fcap; unsigned int fcap_ver; unsigned char type; /* record type */ /* * This was an allocated audit_names and not from the array of * names allocated in the task audit context. Thus this name * should be freed on syscall exit. */ bool should_free; }; /* The per-task audit context. */ struct audit_context { int dummy; /* must be the first element */ int in_syscall; /* 1 if task is in a syscall */ enum audit_state state, current_state; unsigned int serial; /* serial number for record */ int major; /* syscall number */ struct timespec ctime; /* time of syscall entry */ unsigned long argv[4]; /* syscall arguments */ long return_code;/* syscall return code */ u64 prio; int return_valid; /* return code is valid */ /* * The names_list is the list of all audit_names collected during this * syscall. The first AUDIT_NAMES entries in the names_list will * actually be from the preallocated_names array for performance * reasons. Except during allocation they should never be referenced * through the preallocated_names array and should only be found/used * by running the names_list. */ struct audit_names preallocated_names[AUDIT_NAMES]; int name_count; /* total records in names_list */ struct list_head names_list; /* struct audit_names->list anchor */ char *filterkey; /* key for rule that triggered record */ struct path pwd; struct audit_aux_data *aux; struct audit_aux_data *aux_pids; struct sockaddr_storage *sockaddr; size_t sockaddr_len; /* Save things to print about task_struct */ pid_t pid, ppid; kuid_t uid, euid, suid, fsuid; kgid_t gid, egid, sgid, fsgid; unsigned long personality; int arch; pid_t target_pid; kuid_t target_auid; kuid_t target_uid; unsigned int target_sessionid; u32 target_sid; char target_comm[TASK_COMM_LEN]; struct audit_tree_refs *trees, *first_trees; struct list_head killed_trees; int tree_count; int type; union { struct { int nargs; long args[6]; } socketcall; struct { kuid_t uid; kgid_t gid; umode_t mode; u32 osid; int has_perm; uid_t perm_uid; gid_t perm_gid; umode_t perm_mode; unsigned long qbytes; } ipc; struct { mqd_t mqdes; struct mq_attr mqstat; } mq_getsetattr; struct { mqd_t mqdes; int sigev_signo; } mq_notify; struct { mqd_t mqdes; size_t msg_len; unsigned int msg_prio; struct timespec abs_timeout; } mq_sendrecv; struct { int oflag; umode_t mode; struct mq_attr attr; } mq_open; struct { pid_t pid; struct audit_cap_data cap; } capset; struct { int fd; int flags; } mmap; }; int fds[2]; #if AUDIT_DEBUG int put_count; int ino_count; #endif }; extern int audit_ever_enabled; extern void audit_copy_inode(struct audit_names *name, const struct dentry *dentry, const struct inode *inode); extern void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap); extern void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name); extern void audit_log_name(struct audit_context *context, struct audit_names *n, struct path *path, int record_num, int *call_panic); extern int audit_pid; #define AUDIT_INODE_BUCKETS 32 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; static inline int audit_hash_ino(u32 ino) { return (ino & (AUDIT_INODE_BUCKETS-1)); } /* Indicates that audit should log the full pathname. */ #define AUDIT_NAME_FULL -1 extern int audit_match_class(int class, unsigned syscall); extern int audit_comparator(const u32 left, const u32 op, const u32 right); extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right); extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right); extern int parent_len(const char *path); extern int audit_compare_dname_path(const char *dname, const char *path, int plen); extern struct sk_buff * audit_make_reply(int pid, int seq, int type, int done, int multi, const void *payload, int size); extern void audit_panic(const char *message); struct audit_netlink_list { int pid; struct sk_buff_head q; }; int audit_send_list(void *); extern int selinux_audit_rule_update(void); extern struct mutex audit_filter_mutex; extern void audit_free_rule_rcu(struct rcu_head *); extern struct list_head audit_filter_list[]; extern struct audit_entry *audit_dupe_rule(struct audit_krule *old); /* audit watch functions */ #ifdef CONFIG_AUDIT_WATCH extern void audit_put_watch(struct audit_watch *watch); extern void audit_get_watch(struct audit_watch *watch); extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op); extern int audit_add_watch(struct audit_krule *krule, struct list_head **list); extern void audit_remove_watch_rule(struct audit_krule *krule); extern char *audit_watch_path(struct audit_watch *watch); extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev); #else #define audit_put_watch(w) {} #define audit_get_watch(w) {} #define audit_to_watch(k, p, l, o) (-EINVAL) #define audit_add_watch(k, l) (-EINVAL) #define audit_remove_watch_rule(k) BUG() #define audit_watch_path(w) "" #define audit_watch_compare(w, i, d) 0 #endif /* CONFIG_AUDIT_WATCH */ #ifdef CONFIG_AUDIT_TREE extern struct audit_chunk *audit_tree_lookup(const struct inode *); extern void audit_put_chunk(struct audit_chunk *); extern int audit_tree_match(struct audit_chunk *, struct audit_tree *); extern int audit_make_tree(struct audit_krule *, char *, u32); extern int audit_add_tree_rule(struct audit_krule *); extern int audit_remove_tree_rule(struct audit_krule *); extern void audit_trim_trees(void); extern int audit_tag_tree(char *old, char *new); extern const char *audit_tree_path(struct audit_tree *); extern void audit_put_tree(struct audit_tree *); extern void audit_kill_trees(struct list_head *); #else #define audit_remove_tree_rule(rule) BUG() #define audit_add_tree_rule(rule) -EINVAL #define audit_make_tree(rule, str, op) -EINVAL #define audit_trim_trees() (void)0 #define audit_put_tree(tree) (void)0 #define audit_tag_tree(old, new) -EINVAL #define audit_tree_path(rule) "" /* never called */ #define audit_kill_trees(list) BUG() #endif extern char *audit_unpack_string(void **, size_t *, size_t); extern pid_t audit_sig_pid; extern kuid_t audit_sig_uid; extern u32 audit_sig_sid; #ifdef CONFIG_AUDITSYSCALL extern int __audit_signal_info(int sig, struct task_struct *t); static inline int audit_signal_info(int sig, struct task_struct *t) { if (unlikely((audit_pid && t->tgid == audit_pid) || (audit_signals && !audit_dummy_context()))) return __audit_signal_info(sig, t); return 0; } extern void audit_filter_inodes(struct task_struct *, struct audit_context *); extern struct list_head *audit_killed_trees(void); #else #define audit_signal_info(s,t) AUDIT_DISABLED #define audit_filter_inodes(t,c) AUDIT_DISABLED #endif extern struct mutex audit_cmd_mutex;