[PATCH v28 04/25] IMA: avoid label collisions with stacked LSMs

[Casey Schaufler <casey@schaufler-ca.com>]

Integrity measurement may filter on security module information
and needs to be clear in the case of multiple active security
modules which applies. Provide a boot option ima_rules_lsm= to
allow the user to specify an active securty module to apply
filters to. If not specified, use the first registered module
that supports the audit_rule_match() LSM hook. Allow the user
to specify in the IMA policy an lsm= option to specify the
security module to use for a particular rule.

Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
To: Mimi Zohar <zohar@linux.ibm.com>
To: linux-integrity@vger.kernel.org
---
 Documentation/ABI/testing/ima_policy |  8 ++-
 security/integrity/ima/ima_policy.c  | 79 ++++++++++++++++++++--------
 2 files changed, 64 insertions(+), 23 deletions(-)

diff --git a/Documentation/ABI/testing/ima_policy b/Documentation/ABI/testing/ima_policy
index 070779e8d836..84dd19bc4344 100644
--- a/Documentation/ABI/testing/ima_policy
+++ b/Documentation/ABI/testing/ima_policy
@@ -25,7 +25,7 @@ Description:
 			base:	[[func=] [mask=] [fsmagic=] [fsuuid=] [uid=]
 				[euid=] [fowner=] [fsname=]]
 			lsm:	[[subj_user=] [subj_role=] [subj_type=]
-				 [obj_user=] [obj_role=] [obj_type=]]
+				 [obj_user=] [obj_role=] [obj_type=] [lsm=]]
 			option:	[[appraise_type=]] [template=] [permit_directio]
 				[appraise_flag=] [keyrings=]
 		  base:
@@ -117,6 +117,12 @@ Description:
 
 			measure subj_user=_ func=FILE_CHECK mask=MAY_READ
 
+		It is possible to explicitly specify which security
+		module a rule applies to using lsm=.  If the security
+		modules specified is not active on the system the rule
+		will be rejected.  If lsm= is not specified the first
+		security module registered on the system will be assumed.
+
 		Example of measure rules using alternate PCRs::
 
 			measure func=KEXEC_KERNEL_CHECK pcr=4
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 5c40677e881c..008a043335d4 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -79,8 +79,9 @@ struct ima_rule_entry {
 	bool (*uid_op)(kuid_t, kuid_t);    /* Handlers for operators       */
 	bool (*fowner_op)(kuid_t, kuid_t); /* uid_eq(), uid_gt(), uid_lt() */
 	int pcr;
+	int which_lsm; /* which of the rules to use */
 	struct {
-		void *rules[LSMBLOB_ENTRIES]; /* LSM file metadata specific */
+		void *rule;	/* LSM file metadata specific */
 		char *args_p;	/* audit value */
 		int type;	/* audit type */
 	} lsm[MAX_LSM_RULES];
@@ -92,17 +93,17 @@ struct ima_rule_entry {
 
 /**
  * ima_lsm_isset - Is a rule set for any of the active security modules
- * @rules: The set of IMA rules to check
+ * @entry: the rule entry to examine
+ * @lsm_rule: the specific rule type in question
  *
- * If a rule is set for any LSM return true, otherwise return false.
+ * If a rule is set return true, otherwise return false.
  */
-static inline bool ima_lsm_isset(void *rules[])
+static inline bool ima_lsm_isset(struct ima_rule_entry *entry, int lsm_rule)
 {
-	int i;
-
-	for (i = 0; i < LSMBLOB_ENTRIES; i++)
-		if (rules[i])
-			return true;
+	if (lsm_rule < 0 || lsm_rule > MAX_LSM_RULES)
+		return false;
+	if (entry->lsm[lsm_rule].rule)
+		return true;
 	return false;
 }
 
@@ -282,6 +283,20 @@ static int __init default_appraise_policy_setup(char *str)
 }
 __setup("ima_appraise_tcb", default_appraise_policy_setup);
 
+static int ima_rules_lsm __ro_after_init;
+
+static int __init ima_rules_lsm_init(char *str)
+{
+	ima_rules_lsm = lsm_name_to_slot(str);
+	if (ima_rules_lsm < 0) {
+		ima_rules_lsm = 0;
+		pr_err("rule lsm \"%s\" not registered", str);
+	}
+
+	return 1;
+}
+__setup("ima_rules_lsm=", ima_rules_lsm_init);
+
 static struct ima_rule_opt_list *ima_alloc_rule_opt_list(const substring_t *src)
 {
 	struct ima_rule_opt_list *opt_list;
@@ -351,11 +366,10 @@ static void ima_free_rule_opt_list(struct ima_rule_opt_list *opt_list)
 static void ima_lsm_free_rule(struct ima_rule_entry *entry)
 {
 	int i;
-	int r;
 
 	for (i = 0; i < MAX_LSM_RULES; i++) {
-		for (r = 0; r < LSMBLOB_ENTRIES; r++)
-			ima_filter_rule_free(entry->lsm[i].rules[r]);
+		if (entry->lsm[i].rule)
+			ima_filter_rule_free(entry->lsm[i].rule);
 		kfree(entry->lsm[i].args_p);
 	}
 }
@@ -406,8 +420,8 @@ static struct ima_rule_entry *ima_lsm_copy_rule(struct ima_rule_entry *entry)
 
 		ima_filter_rule_init(nentry->lsm[i].type, Audit_equal,
 				     nentry->lsm[i].args_p,
-				     &nentry->lsm[i].rules[0]);
-		if (!ima_lsm_isset(nentry->lsm[i].rules))
+				     &nentry->lsm[i].rule);
+		if (!ima_lsm_isset(nentry, i))
 			pr_warn("rule for LSM \'%s\' is undefined\n",
 				nentry->lsm[i].args_p);
 	}
@@ -596,7 +610,7 @@ static bool ima_match_rules(struct ima_rule_entry *rule,
 		int rc = 0;
 		u32 osid;
 
-		if (!ima_lsm_isset(rule->lsm[i].rules)) {
+		if (!ima_lsm_isset(rule, i)) {
 			if (!rule->lsm[i].args_p)
 				continue;
 			else
@@ -609,14 +623,14 @@ static bool ima_match_rules(struct ima_rule_entry *rule,
 			security_inode_getsecid(inode, &osid);
 			rc = ima_filter_rule_match(osid, rule->lsm[i].type,
 						   Audit_equal,
-						   rule->lsm[i].rules);
+						   rule->lsm[i].rule);
 			break;
 		case LSM_SUBJ_USER:
 		case LSM_SUBJ_ROLE:
 		case LSM_SUBJ_TYPE:
 			rc = ima_filter_rule_match(secid, rule->lsm[i].type,
 						   Audit_equal,
-						   rule->lsm[i].rules);
+						   rule->lsm[i].rule);
 			break;
 		default:
 			break;
@@ -966,7 +980,7 @@ enum {
 	Opt_uid_lt, Opt_euid_lt, Opt_fowner_lt,
 	Opt_appraise_type, Opt_appraise_flag,
 	Opt_permit_directio, Opt_pcr, Opt_template, Opt_keyrings,
-	Opt_label, Opt_err
+	Opt_lsm, Opt_label, Opt_err
 };
 
 static const match_table_t policy_tokens = {
@@ -1004,6 +1018,7 @@ static const match_table_t policy_tokens = {
 	{Opt_template, "template=%s"},
 	{Opt_keyrings, "keyrings=%s"},
 	{Opt_label, "label=%s"},
+	{Opt_lsm, "lsm=%s"},
 	{Opt_err, NULL}
 };
 
@@ -1012,7 +1027,7 @@ static int ima_lsm_rule_init(struct ima_rule_entry *entry,
 {
 	int result;
 
-	if (ima_lsm_isset(entry->lsm[lsm_rule].rules))
+	if (ima_lsm_isset(entry, lsm_rule))
 		return -EINVAL;
 
 	entry->lsm[lsm_rule].args_p = match_strdup(args);
@@ -1022,8 +1037,8 @@ static int ima_lsm_rule_init(struct ima_rule_entry *entry,
 	entry->lsm[lsm_rule].type = audit_type;
 	result = ima_filter_rule_init(entry->lsm[lsm_rule].type, Audit_equal,
 				      entry->lsm[lsm_rule].args_p,
-				      &entry->lsm[lsm_rule].rules[0]);
-	if (!ima_lsm_isset(entry->lsm[lsm_rule].rules)) {
+				      &entry->lsm[lsm_rule].rule);
+	if (!ima_lsm_isset(entry, lsm_rule)) {
 		pr_warn("rule for LSM \'%s\' is undefined\n",
 			entry->lsm[lsm_rule].args_p);
 
@@ -1561,6 +1576,19 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
 						 &(template_desc->num_fields));
 			entry->template = template_desc;
 			break;
+		case Opt_lsm:
+			result = lsm_name_to_slot(args[0].from);
+			if (result == LSMBLOB_INVALID) {
+				int i;
+
+				for (i = 0; i < MAX_LSM_RULES; i++)
+					entry->lsm[i].args_p = NULL;
+				result = -EINVAL;
+				break;
+			}
+			entry->which_lsm = result;
+			result = 0;
+			break;
 		case Opt_err:
 			ima_log_string(ab, "UNKNOWN", p);
 			result = -EINVAL;
@@ -1597,6 +1625,7 @@ ssize_t ima_parse_add_rule(char *rule)
 	struct ima_rule_entry *entry;
 	ssize_t result, len;
 	int audit_info = 0;
+	int i;
 
 	p = strsep(&rule, "\n");
 	len = strlen(p) + 1;
@@ -1614,6 +1643,9 @@ ssize_t ima_parse_add_rule(char *rule)
 
 	INIT_LIST_HEAD(&entry->list);
 
+	for (i = 0; i < MAX_LSM_RULES; i++)
+		entry->which_lsm = ima_rules_lsm;
+
 	result = ima_parse_rule(p, entry);
 	if (result) {
 		ima_free_rule(entry);
@@ -1830,7 +1862,7 @@ int ima_policy_show(struct seq_file *m, void *v)
 	}
 
 	for (i = 0; i < MAX_LSM_RULES; i++) {
-		if (ima_lsm_isset(entry->lsm[i].rules)) {
+		if (ima_lsm_isset(entry, i)) {
 			switch (i) {
 			case LSM_OBJ_USER:
 				seq_printf(m, pt(Opt_obj_user),
@@ -1872,6 +1904,9 @@ int ima_policy_show(struct seq_file *m, void *v)
 		seq_puts(m, "appraise_flag=check_blacklist ");
 	if (entry->flags & IMA_PERMIT_DIRECTIO)
 		seq_puts(m, "permit_directio ");
+	if (entry->which_lsm >= 0)
+		seq_printf(m, pt(Opt_lsm),
+			   lsm_slot_to_name(entry->which_lsm));
 	rcu_read_unlock();
 	seq_puts(m, "\n");
 	return 0;
-- 
2.31.1