[PATCH ghak64 V1] audit: add saddr_fam filter field

[Richard Guy Briggs]

Provide a method to filter out sockaddr and bind calls by network
address family.

Existing SOCKADDR records are listed for any network activity.
Implement the AUDIT_SADDR_FAM field selector to be able to classify or
limit records to specific network address families, such as AF_INET or
AF_INET6.

An example of a network record that is unlikely to be useful and flood
the logs:

type=SOCKADDR msg=audit(07/27/2017 12:18:27.019:845) : saddr={ fam=local
path=/var/run/nscd/socket }
type=SYSCALL msg=audit(07/27/2017 12:18:27.019:845) : arch=x86_64
syscall=connect success=no exit=ENOENT(No such file or directory) a0=0x3
a1=0x7fff229c4980 a2=0x6e a3=0x6 items=1 ppid=3301 pid=6145 auid=sgrubb
uid=sgrubb gid=sgrubb euid=sgrubb suid=sgrubb fsuid=sgrubb egid=sgrubb
sgid=sgrubb fsgid=sgrubb tty=pts3 ses=4 comm=bash exe=/usr/bin/bash
subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
key=network-test

Please see the github issue
https://github.com/linux-audit/audit-kernel/issues/64
Please see the github issue for the accompanying userspace support
https://github.com/linux-audit/audit-userspace/issues/93

Signed-off-by: Richard Guy Briggs <rgb at redhat.com>
---
 include/uapi/linux/audit.h | 1 +
 kernel/auditfilter.c       | 6 ++----
 kernel/auditsc.c           | 5 +++++
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index a1280af20336..c89c6495983d 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -281,6 +281,7 @@
 #define AUDIT_OBJ_GID	110
 #define AUDIT_FIELD_COMPARE	111
 #define AUDIT_EXE	112
+#define AUDIT_SADDR_FAM	113
 
 #define AUDIT_ARG0      200
 #define AUDIT_ARG1      (AUDIT_ARG0+1)
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 2c3c2f349b23..f4bb8e61a54b 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -410,6 +410,8 @@ static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
 	/* FALL THROUGH */
 	case AUDIT_ARCH:
 	case AUDIT_FSTYPE:
+	case AUDIT_EXE:
+	case AUDIT_SADDR_FAM:
 		if (f->op != Audit_not_equal && f->op != Audit_equal)
 			return -EINVAL;
 		break;
@@ -425,10 +427,6 @@ static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
 		if (f->val > AUDIT_MAX_FIELD_COMPARE)
 			return -EINVAL;
 		break;
-	case AUDIT_EXE:
-		if (f->op != Audit_not_equal && f->op != Audit_equal)
-			return -EINVAL;
-		break;
 	}
 	return 0;
 }
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 5371b59bde36..0a830f67ca7a 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -615,6 +615,11 @@ static int audit_filter_rules(struct task_struct *tsk,
 		case AUDIT_LOGINUID_SET:
 			result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val);
 			break;
+		case AUDIT_SADDR_FAM:
+			if (ctx->sockaddr)
+				result = audit_comparator(ctx->sockaddr->ss_family,
+							  f->op, f->val);
+			break;
 		case AUDIT_SUBJ_USER:
 		case AUDIT_SUBJ_ROLE:
 		case AUDIT_SUBJ_TYPE:
-- 
1.8.3.1