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Diffstat (limited to 'security/integrity/ima/ima_policy.c')
-rw-r--r--security/integrity/ima/ima_policy.c115
1 files changed, 78 insertions, 37 deletions
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 0a3b781f18e5..be09e2cacf82 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -12,6 +12,7 @@
*/
#include <linux/module.h>
#include <linux/list.h>
+#include <linux/fs.h>
#include <linux/security.h>
#include <linux/magic.h>
#include <linux/parser.h>
@@ -113,6 +114,7 @@ static struct ima_rule_entry default_measurement_rules[] = {
.uid = GLOBAL_ROOT_UID, .flags = IMA_FUNC | IMA_INMASK | IMA_UID},
{.action = MEASURE, .func = MODULE_CHECK, .flags = IMA_FUNC},
{.action = MEASURE, .func = FIRMWARE_CHECK, .flags = IMA_FUNC},
+ {.action = MEASURE, .func = POLICY_CHECK, .flags = IMA_FUNC},
};
static struct ima_rule_entry default_appraise_rules[] = {
@@ -127,6 +129,10 @@ static struct ima_rule_entry default_appraise_rules[] = {
{.action = DONT_APPRAISE, .fsmagic = SELINUX_MAGIC, .flags = IMA_FSMAGIC},
{.action = DONT_APPRAISE, .fsmagic = NSFS_MAGIC, .flags = IMA_FSMAGIC},
{.action = DONT_APPRAISE, .fsmagic = CGROUP_SUPER_MAGIC, .flags = IMA_FSMAGIC},
+#ifdef CONFIG_IMA_WRITE_POLICY
+ {.action = APPRAISE, .func = POLICY_CHECK,
+ .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED},
+#endif
#ifndef CONFIG_IMA_APPRAISE_SIGNED_INIT
{.action = APPRAISE, .fowner = GLOBAL_ROOT_UID, .flags = IMA_FOWNER},
#else
@@ -207,8 +213,8 @@ static void ima_lsm_update_rules(void)
*
* Returns true on rule match, false on failure.
*/
-static bool ima_match_rules(struct ima_rule_entry *rule,
- struct inode *inode, enum ima_hooks func, int mask)
+static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
+ enum ima_hooks func, int mask)
{
struct task_struct *tsk = current;
const struct cred *cred = current_cred();
@@ -289,7 +295,7 @@ retry:
* In addition to knowing that we need to appraise the file in general,
* we need to differentiate between calling hooks, for hook specific rules.
*/
-static int get_subaction(struct ima_rule_entry *rule, int func)
+static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
{
if (!(rule->flags & IMA_FUNC))
return IMA_FILE_APPRAISE;
@@ -299,13 +305,12 @@ static int get_subaction(struct ima_rule_entry *rule, int func)
return IMA_MMAP_APPRAISE;
case BPRM_CHECK:
return IMA_BPRM_APPRAISE;
- case MODULE_CHECK:
- return IMA_MODULE_APPRAISE;
- case FIRMWARE_CHECK:
- return IMA_FIRMWARE_APPRAISE;
case FILE_CHECK:
- default:
+ case POST_SETATTR:
return IMA_FILE_APPRAISE;
+ case MODULE_CHECK ... MAX_CHECK - 1:
+ default:
+ return IMA_READ_APPRAISE;
}
}
@@ -411,13 +416,16 @@ void __init ima_init_policy(void)
for (i = 0; i < appraise_entries; i++) {
list_add_tail(&default_appraise_rules[i].list,
&ima_default_rules);
+ if (default_appraise_rules[i].func == POLICY_CHECK)
+ temp_ima_appraise |= IMA_APPRAISE_POLICY;
}
ima_rules = &ima_default_rules;
+ ima_update_policy_flag();
}
/* Make sure we have a valid policy, at least containing some rules. */
-int ima_check_policy()
+int ima_check_policy(void)
{
if (list_empty(&ima_temp_rules))
return -EINVAL;
@@ -612,6 +620,14 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
entry->func = MMAP_CHECK;
else if (strcmp(args[0].from, "BPRM_CHECK") == 0)
entry->func = BPRM_CHECK;
+ else if (strcmp(args[0].from, "KEXEC_KERNEL_CHECK") ==
+ 0)
+ entry->func = KEXEC_KERNEL_CHECK;
+ else if (strcmp(args[0].from, "KEXEC_INITRAMFS_CHECK")
+ == 0)
+ entry->func = KEXEC_INITRAMFS_CHECK;
+ else if (strcmp(args[0].from, "POLICY_CHECK") == 0)
+ entry->func = POLICY_CHECK;
else
result = -EINVAL;
if (!result)
@@ -770,6 +786,8 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
temp_ima_appraise |= IMA_APPRAISE_MODULES;
else if (entry->func == FIRMWARE_CHECK)
temp_ima_appraise |= IMA_APPRAISE_FIRMWARE;
+ else if (entry->func == POLICY_CHECK)
+ temp_ima_appraise |= IMA_APPRAISE_POLICY;
audit_log_format(ab, "res=%d", !result);
audit_log_end(ab);
return result;
@@ -855,7 +873,9 @@ static char *mask_tokens[] = {
enum {
func_file = 0, func_mmap, func_bprm,
- func_module, func_firmware, func_post
+ func_module, func_firmware, func_post,
+ func_kexec_kernel, func_kexec_initramfs,
+ func_policy
};
static char *func_tokens[] = {
@@ -864,6 +884,9 @@ static char *func_tokens[] = {
"BPRM_CHECK",
"MODULE_CHECK",
"FIRMWARE_CHECK",
+ "KEXEC_KERNEL_CHECK",
+ "KEXEC_INITRAMFS_CHECK",
+ "POLICY_CHECK",
"POST_SETATTR"
};
@@ -903,6 +926,49 @@ void ima_policy_stop(struct seq_file *m, void *v)
#define mt(token) mask_tokens[token]
#define ft(token) func_tokens[token]
+/*
+ * policy_func_show - display the ima_hooks policy rule
+ */
+static void policy_func_show(struct seq_file *m, enum ima_hooks func)
+{
+ char tbuf[64] = {0,};
+
+ switch (func) {
+ case FILE_CHECK:
+ seq_printf(m, pt(Opt_func), ft(func_file));
+ break;
+ case MMAP_CHECK:
+ seq_printf(m, pt(Opt_func), ft(func_mmap));
+ break;
+ case BPRM_CHECK:
+ seq_printf(m, pt(Opt_func), ft(func_bprm));
+ break;
+ case MODULE_CHECK:
+ seq_printf(m, pt(Opt_func), ft(func_module));
+ break;
+ case FIRMWARE_CHECK:
+ seq_printf(m, pt(Opt_func), ft(func_firmware));
+ break;
+ case POST_SETATTR:
+ seq_printf(m, pt(Opt_func), ft(func_post));
+ break;
+ case KEXEC_KERNEL_CHECK:
+ seq_printf(m, pt(Opt_func), ft(func_kexec_kernel));
+ break;
+ case KEXEC_INITRAMFS_CHECK:
+ seq_printf(m, pt(Opt_func), ft(func_kexec_initramfs));
+ break;
+ case POLICY_CHECK:
+ seq_printf(m, pt(Opt_func), ft(func_policy));
+ break;
+ default:
+ snprintf(tbuf, sizeof(tbuf), "%d", func);
+ seq_printf(m, pt(Opt_func), tbuf);
+ break;
+ }
+ seq_puts(m, " ");
+}
+
int ima_policy_show(struct seq_file *m, void *v)
{
struct ima_rule_entry *entry = v;
@@ -924,33 +990,8 @@ int ima_policy_show(struct seq_file *m, void *v)
seq_puts(m, " ");
- if (entry->flags & IMA_FUNC) {
- switch (entry->func) {
- case FILE_CHECK:
- seq_printf(m, pt(Opt_func), ft(func_file));
- break;
- case MMAP_CHECK:
- seq_printf(m, pt(Opt_func), ft(func_mmap));
- break;
- case BPRM_CHECK:
- seq_printf(m, pt(Opt_func), ft(func_bprm));
- break;
- case MODULE_CHECK:
- seq_printf(m, pt(Opt_func), ft(func_module));
- break;
- case FIRMWARE_CHECK:
- seq_printf(m, pt(Opt_func), ft(func_firmware));
- break;
- case POST_SETATTR:
- seq_printf(m, pt(Opt_func), ft(func_post));
- break;
- default:
- snprintf(tbuf, sizeof(tbuf), "%d", entry->func);
- seq_printf(m, pt(Opt_func), tbuf);
- break;
- }
- seq_puts(m, " ");
- }
+ if (entry->flags & IMA_FUNC)
+ policy_func_show(m, entry->func);
if (entry->flags & IMA_MASK) {
if (entry->mask & MAY_EXEC)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.