aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--include/linux/ima.h23
-rw-r--r--security/integrity/ima/ima.h10
-rw-r--r--security/integrity/ima/ima_appraise.c2
-rw-r--r--security/integrity/ima/ima_asymmetric_keys.c2
-rw-r--r--security/integrity/ima/ima_init.c3
-rw-r--r--security/integrity/ima/ima_main.c69
-rw-r--r--security/integrity/ima/ima_queue_keys.c2
-rw-r--r--security/selinux/ima.c6
8 files changed, 79 insertions, 38 deletions
diff --git a/include/linux/ima.h b/include/linux/ima.h
index 61d5723ec303..b6ab66a546ae 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -11,9 +11,11 @@
#include <linux/fs.h>
#include <linux/security.h>
#include <linux/kexec.h>
+#include <crypto/hash_info.h>
struct linux_binprm;
#ifdef CONFIG_IMA
+extern enum hash_algo ima_get_current_hash_algo(void);
extern int ima_bprm_check(struct linux_binprm *bprm);
extern int ima_file_check(struct file *file, int mask);
extern void ima_post_create_tmpfile(struct user_namespace *mnt_userns,
@@ -33,10 +35,10 @@ extern void ima_post_path_mknod(struct user_namespace *mnt_userns,
extern int ima_file_hash(struct file *file, char *buf, size_t buf_size);
extern int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size);
extern void ima_kexec_cmdline(int kernel_fd, const void *buf, int size);
-extern void ima_measure_critical_data(const char *event_label,
- const char *event_name,
- const void *buf, size_t buf_len,
- bool hash);
+extern int ima_measure_critical_data(const char *event_label,
+ const char *event_name,
+ const void *buf, size_t buf_len,
+ bool hash, u8 *digest, size_t digest_len);
#ifdef CONFIG_IMA_APPRAISE_BOOTPARAM
extern void ima_appraise_parse_cmdline(void);
@@ -64,6 +66,11 @@ static inline const char * const *arch_get_ima_policy(void)
#endif
#else
+static inline enum hash_algo ima_get_current_hash_algo(void)
+{
+ return HASH_ALGO__LAST;
+}
+
static inline int ima_bprm_check(struct linux_binprm *bprm)
{
return 0;
@@ -137,10 +144,14 @@ static inline int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size
static inline void ima_kexec_cmdline(int kernel_fd, const void *buf, int size) {}
-static inline void ima_measure_critical_data(const char *event_label,
+static inline int ima_measure_critical_data(const char *event_label,
const char *event_name,
const void *buf, size_t buf_len,
- bool hash) {}
+ bool hash, u8 *digest,
+ size_t digest_len)
+{
+ return -ENOENT;
+}
#endif /* CONFIG_IMA */
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index f0e448ed1f9f..2f4c20b16ad7 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -264,11 +264,11 @@ void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
struct evm_ima_xattr_data *xattr_value,
int xattr_len, const struct modsig *modsig, int pcr,
struct ima_template_desc *template_desc);
-void process_buffer_measurement(struct user_namespace *mnt_userns,
- struct inode *inode, const void *buf, int size,
- const char *eventname, enum ima_hooks func,
- int pcr, const char *func_data,
- bool buf_hash);
+int process_buffer_measurement(struct user_namespace *mnt_userns,
+ struct inode *inode, const void *buf, int size,
+ const char *eventname, enum ima_hooks func,
+ int pcr, const char *func_data,
+ bool buf_hash, u8 *digest, size_t digest_len);
void ima_audit_measurement(struct integrity_iint_cache *iint,
const unsigned char *filename);
int ima_alloc_init_template(struct ima_event_data *event_data,
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index ef9dcfce45d4..63bec42c353f 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -357,7 +357,7 @@ int ima_check_blacklist(struct integrity_iint_cache *iint,
if ((rc == -EPERM) && (iint->flags & IMA_MEASURE))
process_buffer_measurement(&init_user_ns, NULL, digest, digestsize,
"blacklisted-hash", NONE,
- pcr, NULL, false);
+ pcr, NULL, false, NULL, 0);
}
return rc;
diff --git a/security/integrity/ima/ima_asymmetric_keys.c b/security/integrity/ima/ima_asymmetric_keys.c
index c985418698a4..f6aa0b47a772 100644
--- a/security/integrity/ima/ima_asymmetric_keys.c
+++ b/security/integrity/ima/ima_asymmetric_keys.c
@@ -62,5 +62,5 @@ void ima_post_key_create_or_update(struct key *keyring, struct key *key,
*/
process_buffer_measurement(&init_user_ns, NULL, payload, payload_len,
keyring->description, KEY_CHECK, 0,
- keyring->description, false);
+ keyring->description, false, NULL, 0);
}
diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c
index 5076a7d9d23e..b26fa67476b4 100644
--- a/security/integrity/ima/ima_init.c
+++ b/security/integrity/ima/ima_init.c
@@ -154,7 +154,8 @@ int __init ima_init(void)
ima_init_key_queue();
ima_measure_critical_data("kernel_info", "kernel_version",
- UTS_RELEASE, strlen(UTS_RELEASE), false);
+ UTS_RELEASE, strlen(UTS_RELEASE), false,
+ NULL, 0);
return rc;
}
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 287b90509006..1cba6beb5a60 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -35,7 +35,7 @@ int ima_appraise = IMA_APPRAISE_ENFORCE;
int ima_appraise;
#endif
-int ima_hash_algo = HASH_ALGO_SHA1;
+int __ro_after_init ima_hash_algo = HASH_ALGO_SHA1;
static int hash_setup_done;
static struct notifier_block ima_lsm_policy_notifier = {
@@ -76,6 +76,11 @@ out:
}
__setup("ima_hash=", hash_setup);
+enum hash_algo ima_get_current_hash_algo(void)
+{
+ return ima_hash_algo;
+}
+
/* Prevent mmap'ing a file execute that is already mmap'ed write */
static int mmap_violation_check(enum ima_hooks func, struct file *file,
char **pathbuf, const char **pathname,
@@ -822,7 +827,7 @@ int ima_post_load_data(char *buf, loff_t size,
return 0;
}
-/*
+/**
* process_buffer_measurement - Measure the buffer or the buffer data hash
* @mnt_userns: user namespace of the mount the inode was found from
* @inode: inode associated with the object being measured (NULL for KEY_CHECK)
@@ -833,14 +838,20 @@ int ima_post_load_data(char *buf, loff_t size,
* @pcr: pcr to extend the measurement
* @func_data: func specific data, may be NULL
* @buf_hash: measure buffer data hash
+ * @digest: buffer digest will be written to
+ * @digest_len: buffer length
*
* Based on policy, either the buffer data or buffer data hash is measured
+ *
+ * Return: 0 if the buffer has been successfully measured, 1 if the digest
+ * has been written to the passed location but not added to a measurement entry,
+ * a negative value otherwise.
*/
-void process_buffer_measurement(struct user_namespace *mnt_userns,
- struct inode *inode, const void *buf, int size,
- const char *eventname, enum ima_hooks func,
- int pcr, const char *func_data,
- bool buf_hash)
+int process_buffer_measurement(struct user_namespace *mnt_userns,
+ struct inode *inode, const void *buf, int size,
+ const char *eventname, enum ima_hooks func,
+ int pcr, const char *func_data,
+ bool buf_hash, u8 *digest, size_t digest_len)
{
int ret = 0;
const char *audit_cause = "ENOMEM";
@@ -861,8 +872,11 @@ void process_buffer_measurement(struct user_namespace *mnt_userns,
int action = 0;
u32 secid;
- if (!ima_policy_flag)
- return;
+ if (digest && digest_len < digest_hash_len)
+ return -EINVAL;
+
+ if (!ima_policy_flag && !digest)
+ return -ENOENT;
template = ima_template_desc_buf();
if (!template) {
@@ -883,8 +897,8 @@ void process_buffer_measurement(struct user_namespace *mnt_userns,
action = ima_get_action(mnt_userns, inode, current_cred(),
secid, 0, func, &pcr, &template,
func_data);
- if (!(action & IMA_MEASURE))
- return;
+ if (!(action & IMA_MEASURE) && !digest)
+ return -ENOENT;
}
if (!pcr)
@@ -914,6 +928,12 @@ void process_buffer_measurement(struct user_namespace *mnt_userns,
event_data.buf_len = digest_hash_len;
}
+ if (digest)
+ memcpy(digest, iint.ima_hash->digest, digest_hash_len);
+
+ if (!ima_policy_flag || (func && !(action & IMA_MEASURE)))
+ return 1;
+
ret = ima_alloc_init_template(&event_data, &entry, template);
if (ret < 0) {
audit_cause = "alloc_entry";
@@ -932,7 +952,7 @@ out:
func_measure_str(func),
audit_cause, ret, 0, ret);
- return;
+ return ret;
}
/**
@@ -956,7 +976,7 @@ void ima_kexec_cmdline(int kernel_fd, const void *buf, int size)
process_buffer_measurement(file_mnt_user_ns(f.file), file_inode(f.file),
buf, size, "kexec-cmdline", KEXEC_CMDLINE, 0,
- NULL, false);
+ NULL, false, NULL, 0);
fdput(f);
}
@@ -967,23 +987,30 @@ void ima_kexec_cmdline(int kernel_fd, const void *buf, int size)
* @buf: pointer to buffer data
* @buf_len: length of buffer data (in bytes)
* @hash: measure buffer data hash
+ * @digest: buffer digest will be written to
+ * @digest_len: buffer length
*
* Measure data critical to the integrity of the kernel into the IMA log
* and extend the pcr. Examples of critical data could be various data
* structures, policies, and states stored in kernel memory that can
* impact the integrity of the system.
+ *
+ * Return: 0 if the buffer has been successfully measured, 1 if the digest
+ * has been written to the passed location but not added to a measurement entry,
+ * a negative value otherwise.
*/
-void ima_measure_critical_data(const char *event_label,
- const char *event_name,
- const void *buf, size_t buf_len,
- bool hash)
+int ima_measure_critical_data(const char *event_label,
+ const char *event_name,
+ const void *buf, size_t buf_len,
+ bool hash, u8 *digest, size_t digest_len)
{
if (!event_name || !event_label || !buf || !buf_len)
- return;
+ return -ENOPARAM;
- process_buffer_measurement(&init_user_ns, NULL, buf, buf_len, event_name,
- CRITICAL_DATA, 0, event_label,
- hash);
+ return process_buffer_measurement(&init_user_ns, NULL, buf, buf_len,
+ event_name, CRITICAL_DATA, 0,
+ event_label, hash, digest,
+ digest_len);
}
static int __init init_ima(void)
diff --git a/security/integrity/ima/ima_queue_keys.c b/security/integrity/ima/ima_queue_keys.c
index 979ef6c71f3d..93056c03bf5a 100644
--- a/security/integrity/ima/ima_queue_keys.c
+++ b/security/integrity/ima/ima_queue_keys.c
@@ -165,7 +165,7 @@ void ima_process_queued_keys(void)
entry->keyring_name,
KEY_CHECK, 0,
entry->keyring_name,
- false);
+ false, NULL, 0);
list_del(&entry->list);
ima_free_key_entry(entry);
}
diff --git a/security/selinux/ima.c b/security/selinux/ima.c
index 34d421861bfc..727c4e43219d 100644
--- a/security/selinux/ima.c
+++ b/security/selinux/ima.c
@@ -86,7 +86,8 @@ void selinux_ima_measure_state_locked(struct selinux_state *state)
}
ima_measure_critical_data("selinux", "selinux-state",
- state_str, strlen(state_str), false);
+ state_str, strlen(state_str), false,
+ NULL, 0);
kfree(state_str);
@@ -103,7 +104,8 @@ void selinux_ima_measure_state_locked(struct selinux_state *state)
}
ima_measure_critical_data("selinux", "selinux-policy-hash",
- policy, policy_len, true);
+ policy, policy_len, true,
+ NULL, 0);
vfree(policy);
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.