audit: add saddr_fam filter field

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 audit-testsuite PR at
https://github.com/linux-audit/audit-testsuite/pull/87
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@redhat.com>
[PM: merge fuzz in auditfilter.c]
Signed-off-by: Paul Moore <paul@paul-moore.com>

3 files changed, 11 insertions, 0 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 d5e54e944f72..e69d136eeaf6 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -391,6 +391,7 @@ static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
         case AUDIT_SUBJ_CLR:
         case AUDIT_OBJ_LEV_LOW:
         case AUDIT_OBJ_LEV_HIGH:
+        case AUDIT_SADDR_FAM:
                 /* bit ops are only useful on syscall args */
                 if (f->op == Audit_bitmask || f->op == Audit_bittest)
                         return -EINVAL;
@@ -438,6 +439,10 @@ 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_SADDR_FAM:
+                if (f->val >= AF_MAX)
+                        return -EINVAL;
+                break;
         default:
                 break;
         }
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 30aa07b0115f..9134fe11ff6c 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: