From: Casey Schaufler <casey@schaufler-ca.com>
To: linux-integrity@vger.kernel.org, zohar@linux.ibm.com
Subject: [v11-ima PATCH 12/25] IMA: Change internal interfaces to use lsmblobs
Date: Wed, 27 Nov 2019 13:37:05 -0800 [thread overview]
Message-ID: <20191127213718.18267-13-casey@schaufler-ca.com> (raw)
In-Reply-To: <20191127213718.18267-1-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>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
cc: linux-integrity@vger.kernel.org
---
security/integrity/ima/ima.h | 11 +++++-----
security/integrity/ima/ima_api.c | 10 ++++-----
security/integrity/ima/ima_appraise.c | 4 +---
security/integrity/ima/ima_main.c | 29 +++++++++++----------------
security/integrity/ima/ima_policy.c | 12 +++++------
5 files changed, 30 insertions(+), 36 deletions(-)
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index d95b0ece7434..96b6662ea39f 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -205,9 +205,9 @@ extern const char *const func_tokens[];
struct modsig;
/* LIM API function definitions */
-int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid,
- int mask, enum ima_hooks func, int *pcr,
- struct ima_template_desc **template_desc);
+int ima_get_action(struct inode *inode, const struct cred *cred,
+ struct lsmblob *blob, int mask, enum ima_hooks func,
+ int *pcr, struct ima_template_desc **template_desc);
int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func);
int ima_collect_measurement(struct integrity_iint_cache *iint,
struct file *file, void *buf, loff_t size,
@@ -232,8 +232,9 @@ void ima_free_template_entry(struct ima_template_entry *entry);
const char *ima_d_path(const struct path *path, char **pathbuf, char *filename);
/* IMA policy related functions */
-int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
- enum ima_hooks func, int mask, int flags, int *pcr,
+int ima_match_policy(struct inode *inode, const struct cred *cred,
+ struct lsmblob *blob, enum ima_hooks func, int mask,
+ int flags, int *pcr,
struct ima_template_desc **template_desc);
void ima_init_policy(void);
void ima_update_policy(void);
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index 610759fe63b8..1ab769fa7df6 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -163,7 +163,7 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
* ima_get_action - appraise & measure decision based on policy.
* @inode: pointer to inode to measure
* @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
@@ -181,15 +181,15 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
* Returns IMA_MEASURE, IMA_APPRAISE mask.
*
*/
-int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid,
- int mask, enum ima_hooks func, int *pcr,
- struct ima_template_desc **template_desc)
+int ima_get_action(struct inode *inode, const struct cred *cred,
+ struct lsmblob *blob, int mask, enum ima_hooks func,
+ int *pcr, struct ima_template_desc **template_desc)
{
int flags = IMA_MEASURE | IMA_AUDIT | IMA_APPRAISE | IMA_HASH;
flags &= ima_policy_flag;
- return ima_match_policy(inode, cred, secid, func, mask, flags, pcr,
+ return ima_match_policy(inode, cred, blob, func, mask, flags, pcr,
template_desc);
}
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index 69e549164949..01c755a242ac 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -48,15 +48,13 @@ bool is_ima_appraise_enabled(void)
*/
int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func)
{
- u32 secid;
struct lsmblob blob;
if (!ima_appraise)
return 0;
security_task_getsecid(current, &blob);
- lsmblob_secid(&blob, &secid);
- return ima_match_policy(inode, current_cred(), secid, func, mask,
+ return ima_match_policy(inode, current_cred(), &blob, func, mask,
IMA_APPRAISE | IMA_HASH, NULL, NULL);
}
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 4f55d1bcf3fb..86cc1419587e 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -190,8 +190,8 @@ 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;
@@ -214,7 +214,7 @@ 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(inode, cred, secid, mask, func, &pcr,
+ action = ima_get_action(inode, cred, blob, mask, func, &pcr,
&template_desc);
violation_check = ((func == FILE_CHECK || func == MMAP_CHECK) &&
(ima_policy_flag & IMA_MEASURE));
@@ -388,8 +388,7 @@ int ima_file_mmap(struct file *file, unsigned long prot)
if (file && (prot & PROT_EXEC)) {
security_task_getsecid(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);
}
@@ -415,16 +414,14 @@ int ima_bprm_check(struct linux_binprm *bprm)
struct lsmblob blob;
security_task_getsecid(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);
}
/**
@@ -442,8 +439,7 @@ int ima_file_check(struct file *file, int mask)
struct lsmblob blob;
security_task_getsecid(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);
}
@@ -575,9 +571,8 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
func = read_idmap[read_id] ?: FILE_CHECK;
security_task_getsecid(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);
}
/**
@@ -669,7 +664,7 @@ void process_buffer_measurement(const void *buf, int size,
*/
if (func) {
security_task_getsecid(current, &blob);
- action = ima_get_action(NULL, current_cred(), blob.secid[0], 0, func,
+ action = ima_get_action(NULL, current_cred(), &blob, 0, func,
&pcr, &template);
if (!(action & IMA_MEASURE))
return;
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index c7d2ea47a326..b089d4a8b27b 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -368,7 +368,7 @@ int ima_lsm_policy_change(struct notifier_block *nb, unsigned long event,
* Returns true on rule match, false on failure.
*/
static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
- const struct cred *cred, u32 secid,
+ const struct cred *cred, struct lsmblob *blob,
enum ima_hooks func, int mask)
{
int i;
@@ -431,7 +431,6 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
case LSM_SUBJ_USER:
case LSM_SUBJ_ROLE:
case LSM_SUBJ_TYPE:
- lsmblob_init(&blob, secid);
rc = security_filter_rule_match(&blob,
rule->lsm[i].type,
Audit_equal,
@@ -475,7 +474,7 @@ 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
@@ -488,8 +487,9 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
* list when walking it. Reads are many orders of magnitude more numerous
* than writes so ima_match_policy() is classical RCU candidate.
*/
-int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
- enum ima_hooks func, int mask, int flags, int *pcr,
+int ima_match_policy(struct inode *inode, const struct cred *cred,
+ struct lsmblob *blob, enum ima_hooks func, int mask,
+ int flags, int *pcr,
struct ima_template_desc **template_desc)
{
struct ima_rule_entry *entry;
@@ -504,7 +504,7 @@ int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
if (!(entry->action & actmask))
continue;
- if (!ima_match_rules(entry, inode, cred, secid, func, mask))
+ if (!ima_match_rules(entry, inode, cred, blob, func, mask))
continue;
action |= entry->flags & IMA_ACTION_FLAGS;
--
2.20.1
next prev parent reply other threads:[~2019-11-27 21:38 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191127213718.18267-1-casey.ref@schaufler-ca.com>
2019-11-27 21:36 ` [v11-ima PATCH 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-11-27 21:36 ` [v11-ima PATCH 01/25] LSM: Infrastructure management of the sock security Casey Schaufler
2019-11-27 21:36 ` [v11-ima PATCH 02/25] LSM: Create and manage the lsmblob data structure Casey Schaufler
2019-11-27 21:36 ` [v11-ima PATCH 03/25] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler
2019-11-27 21:36 ` [v11-ima PATCH 04/25] LSM: Use lsmblob in security_kernel_act_as Casey Schaufler
2019-11-27 21:36 ` [v11-ima PATCH 05/25] net: Prepare UDS for security module stacking Casey Schaufler
2019-11-27 21:36 ` [v11-ima PATCH 06/25] LSM: Use lsmblob in security_secctx_to_secid Casey Schaufler
2019-11-27 21:37 ` [v11-ima PATCH 07/25] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler
2019-11-27 21:37 ` [v11-ima PATCH 08/25] LSM: Use lsmblob in security_ipc_getsecid Casey Schaufler
2019-11-27 21:37 ` [v11-ima PATCH 09/25] LSM: Use lsmblob in security_task_getsecid Casey Schaufler
2019-11-27 21:37 ` [v11-ima PATCH 10/25] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler
2019-11-27 21:37 ` [v11-ima PATCH 11/25] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler
2019-11-27 21:37 ` Casey Schaufler [this message]
2019-11-27 21:37 ` [v11-ima PATCH 13/25] LSM: Specify which LSM to display Casey Schaufler
2019-11-27 21:37 ` [v11-ima PATCH 14/25] LSM: Ensure the correct LSM context releaser Casey Schaufler
2019-11-27 21:37 ` [v11-ima PATCH 15/25] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
2019-11-27 21:37 ` [v11-ima PATCH 16/25] LSM: Use lsmcontext in security_dentry_init_security Casey Schaufler
2019-11-27 21:37 ` [v11-ima PATCH 17/25] LSM: Use lsmcontext in security_inode_getsecctx Casey Schaufler
2019-11-27 21:37 ` [v11-ima PATCH 18/25] LSM: security_secid_to_secctx in netlink netfilter Casey Schaufler
2019-11-27 21:37 ` [v11-ima PATCH 19/25] NET: Store LSM netlabel data in a lsmblob Casey Schaufler
2019-11-27 21:37 ` [v11-ima PATCH 20/25] LSM: Verify LSM display sanity in binder Casey Schaufler
2019-12-02 19:56 ` Serge E. Hallyn
2019-11-27 21:37 ` [v11-ima PATCH 21/25] Audit: Add subj_LSM fields when necessary Casey Schaufler
2019-11-27 21:37 ` [v11-ima PATCH 22/25] Audit: Include object data for all security modules Casey Schaufler
2019-11-27 21:37 ` [v11-ima PATCH 23/25] NET: Add SO_PEERCONTEXT for multiple LSMs Casey Schaufler
2019-11-27 21:37 ` [v11-ima PATCH 24/25] LSM: Add /proc attr entry for full LSM context Casey Schaufler
2019-11-27 21:37 ` [v11-ima PATCH 25/25] AppArmor: Remove the exclusive flag Casey Schaufler
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