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: casey@schaufler-ca.com, linux-audit@redhat.com,
keescook@chromium.org, john.johansen@canonical.com,
penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com,
sds@tycho.nsa.gov, linux-kernel@vger.kernel.org
Subject: [PATCH v29 26/28] Audit: Add record for multiple object security contexts
Date: Fri, 24 Sep 2021 10:54:39 -0700 [thread overview]
Message-ID: <20210924175441.7943-27-casey@schaufler-ca.com> (raw)
In-Reply-To: <20210924175441.7943-1-casey@schaufler-ca.com>
Create a new audit record AUDIT_MAC_OBJ_CONTEXTS.
An example of the MAC_OBJ_CONTEXTS (1421) record is:
type=UNKNOWN[1421]
msg=audit(1601152467.009:1050):
obj_selinux="unconfined_u:object_r:user_home_t:s0"
When an audit event includes a AUDIT_MAC_OBJ_CONTEXTS record
the "obj=" field in other records in the event will be "obj=?".
A AUDIT_MAC_OBJ_CONTEXTS record is supplied when the system has
multiple security modules that may make access decisions based
on an object security context.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
include/linux/audit.h | 5 ++++
include/uapi/linux/audit.h | 1 +
kernel/audit.c | 59 ++++++++++++++++++++++++++++++++++++++
kernel/auditsc.c | 37 ++++--------------------
4 files changed, 70 insertions(+), 32 deletions(-)
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 418a485af114..fe7a7c9ea05a 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -187,6 +187,8 @@ extern void audit_log_path_denied(int type,
extern void audit_log_lost(const char *message);
extern int audit_log_task_context(struct audit_buffer *ab);
+extern void audit_log_object_context(struct audit_buffer *ab,
+ struct lsmblob *blob);
extern void audit_log_task_info(struct audit_buffer *ab);
extern int audit_update_lsm_rules(void);
@@ -250,6 +252,9 @@ static inline int audit_log_task_context(struct audit_buffer *ab)
{
return 0;
}
+static inline void audit_log_object_context(struct audit_buffer *ab,
+ struct lsmblob *blob);
+{ }
static inline void audit_log_task_info(struct audit_buffer *ab)
{ }
diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index 6a0ac60688b1..4be22169840c 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -140,6 +140,7 @@
#define AUDIT_MAC_CALIPSO_ADD 1418 /* NetLabel: add CALIPSO DOI entry */
#define AUDIT_MAC_CALIPSO_DEL 1419 /* NetLabel: del CALIPSO DOI entry */
#define AUDIT_MAC_TASK_CONTEXTS 1420 /* Multiple LSM task contexts */
+#define AUDIT_MAC_OBJ_CONTEXTS 1421 /* Multiple LSM objext contexts */
#define AUDIT_FIRST_KERN_ANOM_MSG 1700
#define AUDIT_LAST_KERN_ANOM_MSG 1799
diff --git a/kernel/audit.c b/kernel/audit.c
index 707689605791..1d11a47b6a2b 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -199,6 +199,7 @@ struct audit_context_entry {
int type; /* Audit record type */
union {
struct lsmblob mac_task_context;
+ struct lsmblob mac_obj_context;
};
};
@@ -2190,6 +2191,44 @@ int audit_log_task_context(struct audit_buffer *ab)
}
EXPORT_SYMBOL(audit_log_task_context);
+void audit_log_object_context(struct audit_buffer *ab, struct lsmblob *blob)
+{
+ struct audit_context_entry *ace;
+ struct lsmcontext context;
+ int error;
+
+ if (!lsm_multiple_contexts()) {
+ error = security_secid_to_secctx(blob, &context, LSMBLOB_FIRST);
+ if (error) {
+ if (error != -EINVAL)
+ goto error_path;
+ return;
+ }
+ audit_log_format(ab, " obj=%s", context.context);
+ security_release_secctx(&context);
+ return;
+ }
+ /*
+ * If there is more than one security module that has a
+ * object "context" it's necessary to put the object data
+ * into a separate record to maintain compatibility.
+ */
+ audit_log_format(ab, " obj=?");
+ ace = kzalloc(sizeof(*ace), GFP_KERNEL);
+ if (ace) {
+ INIT_LIST_HEAD(&ace->list);
+ ace->type = AUDIT_MAC_OBJ_CONTEXTS;
+ ace->mac_obj_context = *blob;
+ list_add(&ace->list, &ab->aux_records);
+ return;
+ }
+ error = -ENOMEM;
+
+error_path:
+ audit_panic("error in audit_log_object_context");
+}
+EXPORT_SYMBOL(audit_log_object_context);
+
void audit_log_d_path_exe(struct audit_buffer *ab,
struct mm_struct *mm)
{
@@ -2495,6 +2534,26 @@ void audit_log_end(struct audit_buffer *ab)
}
}
break;
+ case AUDIT_MAC_OBJ_CONTEXTS:
+ for (i = 0; i < LSMBLOB_ENTRIES; i++) {
+ if (entry->mac_obj_context.secid[i] == 0)
+ continue;
+ rc = security_secid_to_secctx(
+ &entry->mac_obj_context,
+ &lcontext, i);
+ if (rc) {
+ if (rc != -EINVAL)
+ audit_panic("error in audit_log_end");
+ audit_log_format(mab, "obj_%s=?",
+ lsm_slot_to_name(0));
+ } else {
+ audit_log_format(mab, "obj_%s=%s",
+ lsm_slot_to_name(0),
+ lcontext.context);
+ security_release_secctx(&lcontext);
+ }
+ }
+ break;
default:
audit_panic("Unknown type in audit_log_end");
break;
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 0fef12638d8a..7cfd0877747a 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1000,7 +1000,6 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
struct lsmblob *blob, char *comm)
{
struct audit_buffer *ab;
- struct lsmcontext lsmctx;
int rc = 0;
ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
@@ -1010,15 +1009,8 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid,
from_kuid(&init_user_ns, auid),
from_kuid(&init_user_ns, uid), sessionid);
- if (lsmblob_is_set(blob)) {
- if (security_secid_to_secctx(blob, &lsmctx, LSMBLOB_FIRST)) {
- audit_log_format(ab, " obj=(none)");
- rc = 1;
- } else {
- audit_log_format(ab, " obj=%s", lsmctx.context);
- security_release_secctx(&lsmctx);
- }
- }
+ if (lsmblob_is_set(blob))
+ audit_log_object_context(ab, blob);
audit_log_format(ab, " ocomm=");
audit_log_untrustedstring(ab, comm);
audit_log_end(ab);
@@ -1253,18 +1245,10 @@ static void show_special(struct audit_context *context, int *call_panic)
from_kgid(&init_user_ns, context->ipc.gid),
context->ipc.mode);
if (osid) {
- struct lsmcontext lsmcxt;
struct lsmblob blob;
lsmblob_init(&blob, osid);
- if (security_secid_to_secctx(&blob, &lsmcxt,
- LSMBLOB_FIRST)) {
- audit_log_format(ab, " osid=%u", osid);
- *call_panic = 1;
- } else {
- audit_log_format(ab, " obj=%s", lsmcxt.context);
- security_release_secctx(&lsmcxt);
- }
+ audit_log_object_context(ab, &blob);
}
if (context->ipc.has_perm) {
audit_log_end(ab);
@@ -1410,19 +1394,8 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
from_kgid(&init_user_ns, n->gid),
MAJOR(n->rdev),
MINOR(n->rdev));
- if (lsmblob_is_set(&n->lsmblob)) {
- struct lsmcontext lsmctx;
-
- if (security_secid_to_secctx(&n->lsmblob, &lsmctx,
- LSMBLOB_FIRST)) {
- audit_log_format(ab, " osid=?");
- if (call_panic)
- *call_panic = 2;
- } else {
- audit_log_format(ab, " obj=%s", lsmctx.context);
- security_release_secctx(&lsmctx);
- }
- }
+ if (lsmblob_is_set(&n->lsmblob))
+ audit_log_object_context(ab, &n->lsmblob);
/* log the audit_names record type */
switch (n->type) {
--
2.31.1
next prev parent reply other threads:[~2021-09-24 18:23 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 ` [PATCH v29 13/28] IMA: Change internal interfaces to use lsmblobs Casey Schaufler
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 ` Casey Schaufler [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210924175441.7943-27-casey@schaufler-ca.com \
--to=casey@schaufler-ca.com \
--cc=casey.schaufler@intel.com \
--cc=jmorris@namei.org \
--cc=john.johansen@canonical.com \
--cc=keescook@chromium.org \
--cc=linux-audit@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
--cc=paul@paul-moore.com \
--cc=penguin-kernel@i-love.sakura.ne.jp \
--cc=sds@tycho.nsa.gov \
--cc=selinux@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).