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From: Casey Schaufler <casey@schaufler-ca.com>
To: casey.schaufler@intel.com, jmorris@namei.org,
	linux-security-module@vger.kernel.org, selinux@vger.kernel.org
Cc: john.johansen@canonical.com, linux-kernel@vger.kernel.org,
	linux-audit@redhat.com, linux-integrity@vger.kernel.org,
	sds@tycho.nsa.gov
Subject: [PATCH v29 13/28] IMA: Change internal interfaces to use lsmblobs
Date: Fri, 24 Sep 2021 10:54:26 -0700	[thread overview]
Message-ID: <20210924175441.7943-14-casey@schaufler-ca.com> (raw)
In-Reply-To: <20210924175441.7943-1-casey@schaufler-ca.com>

The IMA interfaces ima_get_action() and ima_match_policy()
call LSM functions that use lsmblobs. Change the IMA functions
to pass the lsmblob to be compatible with the LSM functions.

Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Acked-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Cc: linux-integrity@vger.kernel.org
To: Mimi Zohar <zohar@linux.ibm.com>
---
 security/integrity/ima/ima.h          |  6 ++---
 security/integrity/ima/ima_api.c      |  6 ++---
 security/integrity/ima/ima_appraise.c |  3 +--
 security/integrity/ima/ima_main.c     | 38 +++++++++++----------------
 security/integrity/ima/ima_policy.c   | 17 ++++++------
 5 files changed, 31 insertions(+), 39 deletions(-)

diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 1f025ff1f011..dfa6cf5115c3 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -255,7 +255,7 @@ static inline void ima_process_queued_keys(void) {}
 
 /* LIM API function definitions */
 int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode,
-		   const struct cred *cred, u32 secid, int mask,
+		   const struct cred *cred, struct lsmblob *blob, int mask,
 		   enum ima_hooks func, int *pcr,
 		   struct ima_template_desc **template_desc,
 		   const char *func_data, unsigned int *allowed_algos);
@@ -286,8 +286,8 @@ const char *ima_d_path(const struct path *path, char **pathbuf, char *filename);
 
 /* IMA policy related functions */
 int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode,
-		     const struct cred *cred, u32 secid, enum ima_hooks func,
-		     int mask, int flags, int *pcr,
+		     const struct cred *cred, struct lsmblob *blob,
+		     enum ima_hooks func, int mask, int flags, int *pcr,
 		     struct ima_template_desc **template_desc,
 		     const char *func_data, unsigned int *allowed_algos);
 void ima_init_policy(void);
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index 2c6c3a5228b5..aa27f2144476 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -165,7 +165,7 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
  * @mnt_userns:	user namespace of the mount the inode was found from
  * @inode: pointer to the inode associated with the object being validated
  * @cred: pointer to credentials structure to validate
- * @secid: secid of the task being validated
+ * @blob: LSM data of the task being validated
  * @mask: contains the permission mask (MAY_READ, MAY_WRITE, MAY_EXEC,
  *        MAY_APPEND)
  * @func: caller identifier
@@ -186,7 +186,7 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
  *
  */
 int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode,
-		   const struct cred *cred, u32 secid, int mask,
+		   const struct cred *cred, struct lsmblob *blob, int mask,
 		   enum ima_hooks func, int *pcr,
 		   struct ima_template_desc **template_desc,
 		   const char *func_data, unsigned int *allowed_algos)
@@ -195,7 +195,7 @@ int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode,
 
 	flags &= ima_policy_flag;
 
-	return ima_match_policy(mnt_userns, inode, cred, secid, func, mask,
+	return ima_match_policy(mnt_userns, inode, cred, blob, func, mask,
 				flags, pcr, template_desc, func_data,
 				allowed_algos);
 }
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index 2fedda131a39..d7244a5eb69d 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -77,9 +77,8 @@ int ima_must_appraise(struct user_namespace *mnt_userns, struct inode *inode,
 		return 0;
 
 	security_task_getsecid_subj(current, &blob);
-	/* scaffolding the .secid[0] */
 	return ima_match_policy(mnt_userns, inode, current_cred(),
-				blob.secid[0], func, mask,
+				&blob, func, mask,
 				IMA_APPRAISE | IMA_HASH, NULL, NULL, NULL,
 				NULL);
 }
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 1a4f7b00253b..4789d5256693 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -199,8 +199,8 @@ void ima_file_free(struct file *file)
 }
 
 static int process_measurement(struct file *file, const struct cred *cred,
-			       u32 secid, char *buf, loff_t size, int mask,
-			       enum ima_hooks func)
+			       struct lsmblob *blob, char *buf, loff_t size,
+			       int mask, enum ima_hooks func)
 {
 	struct inode *inode = file_inode(file);
 	struct integrity_iint_cache *iint = NULL;
@@ -224,7 +224,7 @@ static int process_measurement(struct file *file, const struct cred *cred,
 	 * bitmask based on the appraise/audit/measurement policy.
 	 * Included is the appraise submask.
 	 */
-	action = ima_get_action(file_mnt_user_ns(file), inode, cred, secid,
+	action = ima_get_action(file_mnt_user_ns(file), inode, cred, blob,
 				mask, func, &pcr, &template_desc, NULL,
 				&allowed_algos);
 	violation_check = ((func == FILE_CHECK || func == MMAP_CHECK) &&
@@ -409,8 +409,7 @@ int ima_file_mmap(struct file *file, unsigned long prot)
 
 	if (file && (prot & PROT_EXEC)) {
 		security_task_getsecid_subj(current, &blob);
-		/* scaffolding - until process_measurement changes */
-		return process_measurement(file, current_cred(), blob.secid[0],
+		return process_measurement(file, current_cred(), &blob,
 					   NULL, 0, MAY_EXEC, MMAP_CHECK);
 	}
 
@@ -450,8 +449,8 @@ int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot)
 	security_task_getsecid_subj(current, &blob);
 	inode = file_inode(vma->vm_file);
 	action = ima_get_action(file_mnt_user_ns(vma->vm_file), inode,
-				current_cred(), blob.secid[0], MAY_EXEC,
-				MMAP_CHECK, &pcr, &template, NULL, NULL);
+				current_cred(), &blob, MAY_EXEC, MMAP_CHECK,
+				&pcr, &template, NULL, NULL);
 
 	/* Is the mmap'ed file in policy? */
 	if (!(action & (IMA_MEASURE | IMA_APPRAISE_SUBMASK)))
@@ -489,16 +488,14 @@ int ima_bprm_check(struct linux_binprm *bprm)
 	struct lsmblob blob;
 
 	security_task_getsecid_subj(current, &blob);
-	/* scaffolding until process_measurement changes */
-	ret = process_measurement(bprm->file, current_cred(), blob.secid[0],
-				  NULL, 0, MAY_EXEC, BPRM_CHECK);
+	ret = process_measurement(bprm->file, current_cred(), &blob, NULL, 0,
+				  MAY_EXEC, BPRM_CHECK);
 	if (ret)
 		return ret;
 
 	security_cred_getsecid(bprm->cred, &blob);
-	/* scaffolding until process_measurement changes */
-	return process_measurement(bprm->file, bprm->cred, blob.secid[0],
-				   NULL, 0, MAY_EXEC, CREDS_CHECK);
+	return process_measurement(bprm->file, bprm->cred, &blob, NULL, 0,
+				   MAY_EXEC, CREDS_CHECK);
 }
 
 /**
@@ -516,8 +513,7 @@ int ima_file_check(struct file *file, int mask)
 	struct lsmblob blob;
 
 	security_task_getsecid_subj(current, &blob);
-	/* scaffolding until process_measurement changes */
-	return process_measurement(file, current_cred(), blob.secid[0], NULL, 0,
+	return process_measurement(file, current_cred(), &blob, NULL, 0,
 				   mask & (MAY_READ | MAY_WRITE | MAY_EXEC |
 					   MAY_APPEND), FILE_CHECK);
 }
@@ -714,9 +710,8 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id,
 	/* Read entire file for all partial reads. */
 	func = read_idmap[read_id] ?: FILE_CHECK;
 	security_task_getsecid_subj(current, &blob);
-	/* scaffolding - until process_measurement changes */
-	return process_measurement(file, current_cred(), blob.secid[0], NULL,
-				   0, MAY_READ, func);
+	return process_measurement(file, current_cred(), &blob, NULL, 0,
+				   MAY_READ, func);
 }
 
 const int read_idmap[READING_MAX_ID] = {
@@ -758,9 +753,8 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
 
 	func = read_idmap[read_id] ?: FILE_CHECK;
 	security_task_getsecid_subj(current, &blob);
-	/* scaffolding until process_measurement changes */
-	return process_measurement(file, current_cred(), blob.secid[0], buf,
-				   size, MAY_READ, func);
+	return process_measurement(file, current_cred(), &blob, buf, size,
+				   MAY_READ, func);
 }
 
 /**
@@ -914,7 +908,7 @@ int process_buffer_measurement(struct user_namespace *mnt_userns,
 		security_task_getsecid_subj(current, &blob);
 		/* scaffolding */
 		action = ima_get_action(mnt_userns, inode, current_cred(),
-					blob.secid[0], 0, func, &pcr, &template,
+					&blob, 0, func, &pcr, &template,
 					func_data, NULL);
 		if (!(action & IMA_MEASURE) && !digest)
 			return -ENOENT;
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 67c7762b2533..99d6f6499094 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -560,7 +560,7 @@ static bool ima_match_rule_data(struct ima_rule_entry *rule,
  * @mnt_userns:	user namespace of the mount the inode was found from
  * @inode: a pointer to an inode
  * @cred: a pointer to a credentials structure for user validation
- * @secid: the secid of the task to be validated
+ * @blob: the lsm data of the task to be validated
  * @func: LIM hook identifier
  * @mask: requested action (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
  * @func_data: func specific data, may be NULL
@@ -570,8 +570,8 @@ static bool ima_match_rule_data(struct ima_rule_entry *rule,
 static bool ima_match_rules(struct ima_rule_entry *rule,
 			    struct user_namespace *mnt_userns,
 			    struct inode *inode, const struct cred *cred,
-			    u32 secid, enum ima_hooks func, int mask,
-			    const char *func_data)
+			    struct lsmblob *blob, enum ima_hooks func,
+			    int mask, const char *func_data)
 {
 	int i;
 
@@ -640,8 +640,7 @@ static bool ima_match_rules(struct ima_rule_entry *rule,
 		case LSM_SUBJ_USER:
 		case LSM_SUBJ_ROLE:
 		case LSM_SUBJ_TYPE:
-			lsmblob_init(&lsmdata, secid);
-			rc = ima_filter_rule_match(&lsmdata, rule->lsm[i].type,
+			rc = ima_filter_rule_match(blob, rule->lsm[i].type,
 						   Audit_equal,
 						   rule->lsm[i].rule);
 			break;
@@ -685,7 +684,7 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
  * @inode: pointer to an inode for which the policy decision is being made
  * @cred: pointer to a credentials structure for which the policy decision is
  *        being made
- * @secid: LSM secid of the task to be validated
+ * @blob: LSM data of the task to be validated
  * @func: IMA hook identifier
  * @mask: requested action (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
  * @pcr: set the pcr to extend
@@ -701,8 +700,8 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
  * than writes so ima_match_policy() is classical RCU candidate.
  */
 int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode,
-		     const struct cred *cred, u32 secid, enum ima_hooks func,
-		     int mask, int flags, int *pcr,
+		     const struct cred *cred, struct lsmblob *blob,
+		     enum ima_hooks func, int mask, int flags, int *pcr,
 		     struct ima_template_desc **template_desc,
 		     const char *func_data, unsigned int *allowed_algos)
 {
@@ -718,7 +717,7 @@ int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode,
 		if (!(entry->action & actmask))
 			continue;
 
-		if (!ima_match_rules(entry, mnt_userns, inode, cred, secid,
+		if (!ima_match_rules(entry, mnt_userns, inode, cred, blob,
 				     func, mask, func_data))
 			continue;
 
-- 
2.31.1

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  parent reply	other threads:[~2021-09-24 18:09 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20210924175441.7943-1-casey.ref@schaufler-ca.com>
2021-09-24 17:54 ` [PATCH v29 00/28] LSM: Module stacking for AppArmor Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 01/28] LSM: Infrastructure management of the sock security Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 02/28] LSM: Add the lsmblob data structure Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 03/28] LSM: provide lsm name and id slot mappings Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 04/28] IMA: avoid label collisions with stacked LSMs Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 05/28] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 06/28] LSM: Use lsmblob in security_kernel_act_as Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 07/28] LSM: Use lsmblob in security_secctx_to_secid Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 08/28] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 09/28] LSM: Use lsmblob in security_ipc_getsecid Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 10/28] LSM: Use lsmblob in security_task_getsecid Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 11/28] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 12/28] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler
2021-09-24 17:54   ` Casey Schaufler [this message]
2021-09-24 17:54   ` [PATCH v29 14/28] LSM: Specify which LSM to display Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 15/28] LSM: Ensure the correct LSM context releaser Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 16/28] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 17/28] LSM: Use lsmcontext in security_inode_getsecctx Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 18/28] LSM: security_secid_to_secctx in netlink netfilter Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 19/28] NET: Store LSM netlabel data in a lsmblob Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 20/28] LSM: Verify LSM display sanity in binder Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 21/28] LSM: Extend security_secid_to_secctx to include module selection Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 22/28] Audit: Keep multiple LSM data in audit_names Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 23/28] Audit: Create audit_stamp structure Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 24/28] Audit: Add framework for auxiliary records Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 25/28] Audit: Add record for multiple task security contexts Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 26/28] Audit: Add record for multiple object " Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 27/28] LSM: Add /proc attr entry for full LSM context Casey Schaufler
2021-09-24 17:54   ` [PATCH v29 28/28] AppArmor: Remove the exclusive flag Casey Schaufler

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