[PATCH ghak90 V8 10/16] audit: add containerid filtering

From: Richard Guy Briggs <rgb@redhat.com>
To: containers@lists.linux-foundation.org, linux-api@vger.kernel.org,
	Linux-Audit Mailing List <linux-audit@redhat.com>,
	linux-fsdevel@vger.kernel.org,
	LKML <linux-kernel@vger.kernel.org>,
	netdev@vger.kernel.org, netfilter-devel@vger.kernel.org
Cc: Paul Moore <paul@paul-moore.com>,
	sgrubb@redhat.com, omosnace@redhat.com, dhowells@redhat.com,
	simo@redhat.com, eparis@parisplace.org, serge@hallyn.com,
	ebiederm@xmission.com, nhorman@tuxdriver.com, dwalsh@redhat.com,
	mpatel@redhat.com, Richard Guy Briggs <rgb@redhat.com>
Subject: [PATCH ghak90 V8 10/16] audit: add containerid filtering
Date: Tue, 31 Dec 2019 14:48:23 -0500	[thread overview]
Message-ID: <91a6c8e1ba1a299fba3dc8809b76f3e828d6d63f.1577736799.git.rgb@redhat.com> (raw)
In-Reply-To: <cover.1577736799.git.rgb@redhat.com>
In-Reply-To: <cover.1577736799.git.rgb@redhat.com>

Implement audit container identifier filtering using the AUDIT_CONTID
field name to send an 8-character string representing a u64 since the
value field is only u32.

Sending it as two u32 was considered, but gathering and comparing two
fields was more complex.

The feature indicator is AUDIT_FEATURE_BITMAP_CONTAINERID.

Please see the github audit kernel issue for the contid filter feature:
  https://github.com/linux-audit/audit-kernel/issues/91
Please see the github audit userspace issue for filter additions:
  https://github.com/linux-audit/audit-userspace/issues/40
Please see the github audit testsuiite issue for the test case:
  https://github.com/linux-audit/audit-testsuite/issues/64
Please see the github audit wiki for the feature overview:
  https://github.com/linux-audit/audit-kernel/wiki/RFE-Audit-Container-ID
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Reviewed-by: Ondrej Mosnacek <omosnace@redhat.com>
---
 include/linux/audit.h      |  1 +
 include/uapi/linux/audit.h |  5 ++++-
 kernel/audit.h             |  1 +
 kernel/auditfilter.c       | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 kernel/auditsc.c           |  4 ++++
 5 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index 29b81cc43f8d..5531d37a4226 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -68,6 +68,7 @@ struct audit_field {
 	u32				type;
 	union {
 		u32			val;
+		u64			val64;
 		kuid_t			uid;
 		kgid_t			gid;
 		struct {
diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index 4f87b06f0acd..ea6638bb914b 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -269,6 +269,7 @@
 #define AUDIT_LOGINUID_SET	24
 #define AUDIT_SESSIONID	25	/* Session ID */
 #define AUDIT_FSTYPE	26	/* FileSystem Type */
+#define AUDIT_CONTID	27	/* Container ID */
 
 				/* These are ONLY useful when checking
 				 * at syscall exit time (AUDIT_AT_EXIT). */
@@ -350,6 +351,7 @@ enum {
 #define AUDIT_FEATURE_BITMAP_SESSIONID_FILTER	0x00000010
 #define AUDIT_FEATURE_BITMAP_LOST_RESET		0x00000020
 #define AUDIT_FEATURE_BITMAP_FILTER_FS		0x00000040
+#define AUDIT_FEATURE_BITMAP_CONTAINERID	0x00000080
 
 #define AUDIT_FEATURE_BITMAP_ALL (AUDIT_FEATURE_BITMAP_BACKLOG_LIMIT | \
 				  AUDIT_FEATURE_BITMAP_BACKLOG_WAIT_TIME | \
@@ -357,7 +359,8 @@ enum {
 				  AUDIT_FEATURE_BITMAP_EXCLUDE_EXTEND | \
 				  AUDIT_FEATURE_BITMAP_SESSIONID_FILTER | \
 				  AUDIT_FEATURE_BITMAP_LOST_RESET | \
-				  AUDIT_FEATURE_BITMAP_FILTER_FS)
+				  AUDIT_FEATURE_BITMAP_FILTER_FS | \
+				  AUDIT_FEATURE_BITMAP_CONTAINERID)
 
 /* deprecated: AUDIT_VERSION_* */
 #define AUDIT_VERSION_LATEST 		AUDIT_FEATURE_BITMAP_ALL
diff --git a/kernel/audit.h b/kernel/audit.h
index 000ca7c89f6d..5e2f5c9820d8 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -225,6 +225,7 @@ static inline int audit_hash_contid(u64 contid)
 
 extern int audit_match_class(int class, unsigned syscall);
 extern int audit_comparator(const u32 left, const u32 op, const u32 right);
+extern int audit_comparator64(const u64 left, const u32 op, const u64 right);
 extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
 extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
 extern int parent_len(const char *path);
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index b0126e9c0743..9606f973fe33 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -399,6 +399,7 @@ static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
 	case AUDIT_FILETYPE:
 	case AUDIT_FIELD_COMPARE:
 	case AUDIT_EXE:
+	case AUDIT_CONTID:
 		/* only equal and not equal valid ops */
 		if (f->op != Audit_not_equal && f->op != Audit_equal)
 			return -EINVAL;
@@ -586,6 +587,14 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
 			}
 			entry->rule.exe = audit_mark;
 			break;
+		case AUDIT_CONTID:
+			if (f->val != sizeof(u64))
+				goto exit_free;
+			str = audit_unpack_string(&bufp, &remain, f->val);
+			if (IS_ERR(str))
+				goto exit_free;
+			f->val64 = ((u64 *)str)[0];
+			break;
 		}
 	}
 
@@ -668,6 +677,11 @@ static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule)
 			data->buflen += data->values[i] =
 				audit_pack_string(&bufp, audit_mark_path(krule->exe));
 			break;
+		case AUDIT_CONTID:
+			data->buflen += data->values[i] = sizeof(u64);
+			memcpy(bufp, &f->val64, sizeof(u64));
+			bufp += sizeof(u64);
+			break;
 		case AUDIT_LOGINUID_SET:
 			if (krule->pflags & AUDIT_LOGINUID_LEGACY && !f->val) {
 				data->fields[i] = AUDIT_LOGINUID;
@@ -754,6 +768,10 @@ static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b)
 			if (!gid_eq(a->fields[i].gid, b->fields[i].gid))
 				return 1;
 			break;
+		case AUDIT_CONTID:
+			if (a->fields[i].val64 != b->fields[i].val64)
+				return 1;
+			break;
 		default:
 			if (a->fields[i].val != b->fields[i].val)
 				return 1;
@@ -1211,6 +1229,30 @@ int audit_comparator(u32 left, u32 op, u32 right)
 	}
 }
 
+int audit_comparator64(u64 left, u32 op, u64 right)
+{
+	switch (op) {
+	case Audit_equal:
+		return (left == right);
+	case Audit_not_equal:
+		return (left != right);
+	case Audit_lt:
+		return (left < right);
+	case Audit_le:
+		return (left <= right);
+	case Audit_gt:
+		return (left > right);
+	case Audit_ge:
+		return (left >= right);
+	case Audit_bitmask:
+		return (left & right);
+	case Audit_bittest:
+		return ((left & right) == right);
+	default:
+		return 0;
+	}
+}
+
 int audit_uid_comparator(kuid_t left, u32 op, kuid_t right)
 {
 	switch (op) {
@@ -1345,6 +1387,10 @@ int audit_filter(int msgtype, unsigned int listtype)
 				result = audit_comparator(audit_loginuid_set(current),
 							  f->op, f->val);
 				break;
+			case AUDIT_CONTID:
+				result = audit_comparator64(audit_get_contid(current),
+							    f->op, f->val64);
+				break;
 			case AUDIT_MSGTYPE:
 				result = audit_comparator(msgtype, f->op, f->val);
 				break;
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 3138c88887c7..a658fe775b86 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -629,6 +629,10 @@ static int audit_filter_rules(struct task_struct *tsk,
 				result = audit_comparator(ctx->sockaddr->ss_family,
 							  f->op, f->val);
 			break;
+		case AUDIT_CONTID:
+			result = audit_comparator64(audit_get_contid(tsk),
+						    f->op, f->val64);
+			break;
 		case AUDIT_SUBJ_USER:
 		case AUDIT_SUBJ_ROLE:
 		case AUDIT_SUBJ_TYPE:
-- 
1.8.3.1

