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-rw-r--r--security/integrity/ima/Kconfig25
-rw-r--r--security/integrity/ima/ima_api.c7
-rw-r--r--security/integrity/ima/ima_crypto.c35
-rw-r--r--security/integrity/ima/ima_fs.c37
-rw-r--r--security/integrity/ima/ima_init.c17
-rw-r--r--security/integrity/ima/ima_main.c5
-rw-r--r--security/integrity/ima/ima_policy.c42
-rw-r--r--security/integrity/ima/ima_template.c103
8 files changed, 164 insertions, 107 deletions
diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig
index e099875..b80a93e 100644
--- a/security/integrity/ima/Kconfig
+++ b/security/integrity/ima/Kconfig
@@ -131,3 +131,28 @@ config IMA_TRUSTED_KEYRING
help
This option requires that all keys added to the .ima
keyring be signed by a key on the system trusted keyring.
+
+config IMA_LOAD_X509
+ bool "Load X509 certificate onto the '.ima' trusted keyring"
+ depends on IMA_TRUSTED_KEYRING
+ default n
+ help
+ File signature verification is based on the public keys
+ loaded on the .ima trusted keyring. These public keys are
+ X509 certificates signed by a trusted key on the
+ .system keyring. This option enables X509 certificate
+ loading from the kernel onto the '.ima' trusted keyring.
+
+config IMA_X509_PATH
+ string "IMA X509 certificate path"
+ depends on IMA_LOAD_X509
+ default "/etc/keys/x509_ima.der"
+ help
+ This option defines IMA X509 certificate path.
+
+config IMA_APPRAISE_SIGNED_INIT
+ bool "Require signed user-space initialization"
+ depends on IMA_LOAD_X509
+ default n
+ help
+ This option requires user-space init to be signed.
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index f92be1b..b8a27c5 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -173,8 +173,7 @@ int ima_get_action(struct inode *inode, int mask, int function)
{
int flags = IMA_MEASURE | IMA_AUDIT | IMA_APPRAISE;
- if (!ima_appraise)
- flags &= ~IMA_APPRAISE;
+ flags &= ima_policy_flag;
return ima_match_policy(inode, function, mask, flags);
}
@@ -325,11 +324,11 @@ const char *ima_d_path(struct path *path, char **pathbuf)
{
char *pathname = NULL;
- *pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
+ *pathbuf = __getname();
if (*pathbuf) {
pathname = d_absolute_path(path, *pathbuf, PATH_MAX);
if (IS_ERR(pathname)) {
- kfree(*pathbuf);
+ __putname(*pathbuf);
*pathbuf = NULL;
pathname = NULL;
}
diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c
index 78d66da..686355f 100644
--- a/security/integrity/ima/ima_crypto.c
+++ b/security/integrity/ima/ima_crypto.c
@@ -67,36 +67,6 @@ MODULE_PARM_DESC(ahash_bufsize, "Maximum ahash buffer size");
static struct crypto_shash *ima_shash_tfm;
static struct crypto_ahash *ima_ahash_tfm;
-/**
- * ima_kernel_read - read file content
- *
- * This is a function for reading file content instead of kernel_read().
- * It does not perform locking checks to ensure it cannot be blocked.
- * It does not perform security checks because it is irrelevant for IMA.
- *
- */
-static int ima_kernel_read(struct file *file, loff_t offset,
- char *addr, unsigned long count)
-{
- mm_segment_t old_fs;
- char __user *buf = addr;
- ssize_t ret = -EINVAL;
-
- if (!(file->f_mode & FMODE_READ))
- return -EBADF;
-
- old_fs = get_fs();
- set_fs(get_ds());
- if (file->f_op->read)
- ret = file->f_op->read(file, buf, count, &offset);
- else if (file->f_op->aio_read)
- ret = do_sync_read(file, buf, count, &offset);
- else if (file->f_op->read_iter)
- ret = new_sync_read(file, buf, count, &offset);
- set_fs(old_fs);
- return ret;
-}
-
int __init ima_init_crypto(void)
{
long rc;
@@ -324,7 +294,8 @@ static int ima_calc_file_hash_atfm(struct file *file,
}
/* read buffer */
rbuf_len = min_t(loff_t, i_size - offset, rbuf_size[active]);
- rc = ima_kernel_read(file, offset, rbuf[active], rbuf_len);
+ rc = integrity_kernel_read(file, offset, rbuf[active],
+ rbuf_len);
if (rc != rbuf_len)
goto out3;
@@ -414,7 +385,7 @@ static int ima_calc_file_hash_tfm(struct file *file,
while (offset < i_size) {
int rbuf_len;
- rbuf_len = ima_kernel_read(file, offset, rbuf, PAGE_SIZE);
+ rbuf_len = integrity_kernel_read(file, offset, rbuf, PAGE_SIZE);
if (rbuf_len < 0) {
rc = rbuf_len;
break;
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index da92fcc..461215e 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -118,6 +118,7 @@ static int ima_measurements_show(struct seq_file *m, void *v)
/* the list never shrinks, so we don't need a lock here */
struct ima_queue_entry *qe = v;
struct ima_template_entry *e;
+ char *template_name;
int namelen;
u32 pcr = CONFIG_IMA_MEASURE_PCR_IDX;
bool is_ima_template = false;
@@ -128,6 +129,9 @@ static int ima_measurements_show(struct seq_file *m, void *v)
if (e == NULL)
return -1;
+ template_name = (e->template_desc->name[0] != '\0') ?
+ e->template_desc->name : e->template_desc->fmt;
+
/*
* 1st: PCRIndex
* PCR used is always the same (config option) in
@@ -139,14 +143,14 @@ static int ima_measurements_show(struct seq_file *m, void *v)
ima_putc(m, e->digest, TPM_DIGEST_SIZE);
/* 3rd: template name size */
- namelen = strlen(e->template_desc->name);
+ namelen = strlen(template_name);
ima_putc(m, &namelen, sizeof(namelen));
/* 4th: template name */
- ima_putc(m, e->template_desc->name, namelen);
+ ima_putc(m, template_name, namelen);
/* 5th: template length (except for 'ima' template) */
- if (strcmp(e->template_desc->name, IMA_TEMPLATE_IMA_NAME) == 0)
+ if (strcmp(template_name, IMA_TEMPLATE_IMA_NAME) == 0)
is_ima_template = true;
if (!is_ima_template)
@@ -200,6 +204,7 @@ static int ima_ascii_measurements_show(struct seq_file *m, void *v)
/* the list never shrinks, so we don't need a lock here */
struct ima_queue_entry *qe = v;
struct ima_template_entry *e;
+ char *template_name;
int i;
/* get entry */
@@ -207,6 +212,9 @@ static int ima_ascii_measurements_show(struct seq_file *m, void *v)
if (e == NULL)
return -1;
+ template_name = (e->template_desc->name[0] != '\0') ?
+ e->template_desc->name : e->template_desc->fmt;
+
/* 1st: PCR used (config option) */
seq_printf(m, "%2d ", CONFIG_IMA_MEASURE_PCR_IDX);
@@ -214,7 +222,7 @@ static int ima_ascii_measurements_show(struct seq_file *m, void *v)
ima_print_digest(m, e->digest, TPM_DIGEST_SIZE);
/* 3th: template name */
- seq_printf(m, " %s", e->template_desc->name);
+ seq_printf(m, " %s", template_name);
/* 4th: template specific data */
for (i = 0; i < e->template_desc->num_fields; i++) {
@@ -288,7 +296,12 @@ static struct dentry *runtime_measurements_count;
static struct dentry *violations;
static struct dentry *ima_policy;
-static atomic_t policy_opencount = ATOMIC_INIT(1);
+enum ima_fs_flags {
+ IMA_FS_BUSY,
+};
+
+static unsigned long ima_fs_flags;
+
/*
* ima_open_policy: sequentialize access to the policy file
*/
@@ -297,9 +310,9 @@ static int ima_open_policy(struct inode *inode, struct file *filp)
/* No point in being allowed to open it if you aren't going to write */
if (!(filp->f_flags & O_WRONLY))
return -EACCES;
- if (atomic_dec_and_test(&policy_opencount))
- return 0;
- return -EBUSY;
+ if (test_and_set_bit(IMA_FS_BUSY, &ima_fs_flags))
+ return -EBUSY;
+ return 0;
}
/*
@@ -311,10 +324,16 @@ static int ima_open_policy(struct inode *inode, struct file *filp)
*/
static int ima_release_policy(struct inode *inode, struct file *file)
{
+ const char *cause = valid_policy ? "completed" : "failed";
+
+ pr_info("IMA: policy update %s\n", cause);
+ integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL,
+ "policy_update", cause, !valid_policy, 0);
+
if (!valid_policy) {
ima_delete_rules();
valid_policy = 1;
- atomic_set(&policy_opencount, 1);
+ clear_bit(IMA_FS_BUSY, &ima_fs_flags);
return 0;
}
ima_update_policy();
diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c
index 9164fc8..5e4c29d 100644
--- a/security/integrity/ima/ima_init.c
+++ b/security/integrity/ima/ima_init.c
@@ -24,6 +24,12 @@
#include <crypto/hash_info.h>
#include "ima.h"
+#ifdef CONFIG_IMA_X509_PATH
+#define IMA_X509_PATH CONFIG_IMA_X509_PATH
+#else
+#define IMA_X509_PATH "/etc/keys/x509_ima.der"
+#endif
+
/* name for boot aggregate entry */
static const char *boot_aggregate_name = "boot_aggregate";
int ima_used_chip;
@@ -91,6 +97,17 @@ err_out:
return result;
}
+#ifdef CONFIG_IMA_LOAD_X509
+void __init ima_load_x509(void)
+{
+ int unset_flags = ima_policy_flag & IMA_APPRAISE;
+
+ ima_policy_flag &= ~unset_flags;
+ integrity_load_x509(INTEGRITY_KEYRING_IMA, IMA_X509_PATH);
+ ima_policy_flag |= unset_flags;
+}
+#endif
+
int __init ima_init(void)
{
u8 pcr_i[TPM_DIGEST_SIZE];
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 62f59ec..eeee00dc 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -143,7 +143,7 @@ void ima_file_free(struct file *file)
struct inode *inode = file_inode(file);
struct integrity_iint_cache *iint;
- if (!iint_initialized || !S_ISREG(inode->i_mode))
+ if (!ima_policy_flag || !S_ISREG(inode->i_mode))
return;
iint = integrity_iint_find(inode);
@@ -246,7 +246,8 @@ out_digsig:
rc = -EACCES;
kfree(xattr_value);
out_free:
- kfree(pathbuf);
+ if (pathbuf)
+ __putname(pathbuf);
out:
mutex_unlock(&inode->i_mutex);
if ((rc && must_appraise) && (ima_appraise & IMA_APPRAISE_ENFORCE))
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index cdc620b..d1eefb9 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -100,7 +100,13 @@ static struct ima_rule_entry default_appraise_rules[] = {
{.action = DONT_APPRAISE, .fsmagic = SECURITYFS_MAGIC, .flags = IMA_FSMAGIC},
{.action = DONT_APPRAISE, .fsmagic = SELINUX_MAGIC, .flags = IMA_FSMAGIC},
{.action = DONT_APPRAISE, .fsmagic = CGROUP_SUPER_MAGIC, .flags = IMA_FSMAGIC},
+#ifndef CONFIG_IMA_APPRAISE_SIGNED_INIT
{.action = APPRAISE, .fowner = GLOBAL_ROOT_UID, .flags = IMA_FOWNER},
+#else
+ /* force signature */
+ {.action = APPRAISE, .fowner = GLOBAL_ROOT_UID,
+ .flags = IMA_FOWNER | IMA_DIGSIG_REQUIRED},
+#endif
};
static LIST_HEAD(ima_default_rules);
@@ -356,19 +362,8 @@ void __init ima_init_policy(void)
*/
void ima_update_policy(void)
{
- static const char op[] = "policy_update";
- const char *cause = "already-exists";
- int result = 1;
- int audit_info = 0;
-
- if (ima_rules == &ima_default_rules) {
- ima_rules = &ima_policy_rules;
- ima_update_policy_flag();
- cause = "complete";
- result = 0;
- }
- integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL,
- NULL, op, cause, result, audit_info);
+ ima_rules = &ima_policy_rules;
+ ima_update_policy_flag();
}
enum {
@@ -686,13 +681,12 @@ ssize_t ima_parse_add_rule(char *rule)
ssize_t result, len;
int audit_info = 0;
- /* Prevent installed policy from changing */
- if (ima_rules != &ima_default_rules) {
- integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL,
- NULL, op, "already-exists",
- -EACCES, audit_info);
- return -EACCES;
- }
+ p = strsep(&rule, "\n");
+ len = strlen(p) + 1;
+ p += strspn(p, " \t");
+
+ if (*p == '#' || *p == '\0')
+ return len;
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry) {
@@ -703,14 +697,6 @@ ssize_t ima_parse_add_rule(char *rule)
INIT_LIST_HEAD(&entry->list);
- p = strsep(&rule, "\n");
- len = strlen(p) + 1;
-
- if (*p == '#') {
- kfree(entry);
- return len;
- }
-
result = ima_parse_rule(p, entry);
if (result) {
kfree(entry);
diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c
index e854862..0b7404e 100644
--- a/security/integrity/ima/ima_template.c
+++ b/security/integrity/ima/ima_template.c
@@ -24,6 +24,7 @@ static struct ima_template_desc defined_templates[] = {
{.name = IMA_TEMPLATE_IMA_NAME, .fmt = IMA_TEMPLATE_IMA_FMT},
{.name = "ima-ng", .fmt = "d-ng|n-ng"},
{.name = "ima-sig", .fmt = "d-ng|n-ng|sig"},
+ {.name = "", .fmt = ""}, /* placeholder for a custom format */
};
static struct ima_template_field supported_fields[] = {
@@ -41,19 +42,28 @@ static struct ima_template_field supported_fields[] = {
static struct ima_template_desc *ima_template;
static struct ima_template_desc *lookup_template_desc(const char *name);
+static int template_desc_init_fields(const char *template_fmt,
+ struct ima_template_field ***fields,
+ int *num_fields);
static int __init ima_template_setup(char *str)
{
struct ima_template_desc *template_desc;
int template_len = strlen(str);
+ if (ima_template)
+ return 1;
+
/*
* Verify that a template with the supplied name exists.
* If not, use CONFIG_IMA_DEFAULT_TEMPLATE.
*/
template_desc = lookup_template_desc(str);
- if (!template_desc)
+ if (!template_desc) {
+ pr_err("template %s not found, using %s\n",
+ str, CONFIG_IMA_DEFAULT_TEMPLATE);
return 1;
+ }
/*
* Verify whether the current hash algorithm is supported
@@ -70,6 +80,25 @@ static int __init ima_template_setup(char *str)
}
__setup("ima_template=", ima_template_setup);
+static int __init ima_template_fmt_setup(char *str)
+{
+ int num_templates = ARRAY_SIZE(defined_templates);
+
+ if (ima_template)
+ return 1;
+
+ if (template_desc_init_fields(str, NULL, NULL) < 0) {
+ pr_err("format string '%s' not valid, using template %s\n",
+ str, CONFIG_IMA_DEFAULT_TEMPLATE);
+ return 1;
+ }
+
+ defined_templates[num_templates - 1].fmt = str;
+ ima_template = defined_templates + num_templates - 1;
+ return 1;
+}
+__setup("ima_template_fmt=", ima_template_fmt_setup);
+
static struct ima_template_desc *lookup_template_desc(const char *name)
{
int i;
@@ -113,43 +142,46 @@ static int template_desc_init_fields(const char *template_fmt,
struct ima_template_field ***fields,
int *num_fields)
{
- char *c, *template_fmt_copy, *template_fmt_ptr;
+ const char *template_fmt_ptr;
+ struct ima_template_field *found_fields[IMA_TEMPLATE_NUM_FIELDS_MAX];
int template_num_fields = template_fmt_size(template_fmt);
- int i, result = 0;
+ int i, len;
- if (template_num_fields > IMA_TEMPLATE_NUM_FIELDS_MAX)
+ if (template_num_fields > IMA_TEMPLATE_NUM_FIELDS_MAX) {
+ pr_err("format string '%s' contains too many fields\n",
+ template_fmt);
return -EINVAL;
-
- /* copying is needed as strsep() modifies the original buffer */
- template_fmt_copy = kstrdup(template_fmt, GFP_KERNEL);
- if (template_fmt_copy == NULL)
- return -ENOMEM;
-
- *fields = kzalloc(template_num_fields * sizeof(*fields), GFP_KERNEL);
- if (*fields == NULL) {
- result = -ENOMEM;
- goto out;
}
- template_fmt_ptr = template_fmt_copy;
- for (i = 0; (c = strsep(&template_fmt_ptr, "|")) != NULL &&
- i < template_num_fields; i++) {
- struct ima_template_field *f = lookup_template_field(c);
+ for (i = 0, template_fmt_ptr = template_fmt; i < template_num_fields;
+ i++, template_fmt_ptr += len + 1) {
+ char tmp_field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN + 1];
+
+ len = strchrnul(template_fmt_ptr, '|') - template_fmt_ptr;
+ if (len == 0 || len > IMA_TEMPLATE_FIELD_ID_MAX_LEN) {
+ pr_err("Invalid field with length %d\n", len);
+ return -EINVAL;
+ }
- if (!f) {
- result = -ENOENT;
- goto out;
+ memcpy(tmp_field_id, template_fmt_ptr, len);
+ tmp_field_id[len] = '\0';
+ found_fields[i] = lookup_template_field(tmp_field_id);
+ if (!found_fields[i]) {
+ pr_err("field '%s' not found\n", tmp_field_id);
+ return -ENOENT;
}
- (*fields)[i] = f;
}
- *num_fields = i;
-out:
- if (result < 0) {
- kfree(*fields);
- *fields = NULL;
+
+ if (fields && num_fields) {
+ *fields = kmalloc_array(i, sizeof(*fields), GFP_KERNEL);
+ if (*fields == NULL)
+ return -ENOMEM;
+
+ memcpy(*fields, found_fields, i * sizeof(*fields));
+ *num_fields = i;
}
- kfree(template_fmt_copy);
- return result;
+
+ return 0;
}
struct ima_template_desc *ima_template_desc_current(void)
@@ -163,8 +195,15 @@ struct ima_template_desc *ima_template_desc_current(void)
int __init ima_init_template(void)
{
struct ima_template_desc *template = ima_template_desc_current();
+ int result;
+
+ result = template_desc_init_fields(template->fmt,
+ &(template->fields),
+ &(template->num_fields));
+ if (result < 0)
+ pr_err("template %s init failed, result: %d\n",
+ (strlen(template->name) ?
+ template->name : template->fmt), result);
- return template_desc_init_fields(template->fmt,
- &(template->fields),
- &(template->num_fields));
+ return result;
}
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