diff options
| author | Richard Guy Briggs <rgb@redhat.com> | 2019-05-09 20:01:36 -0400 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2019-05-23 21:07:30 -0400 |
| commit | bf361231c295d92a28ca283ea713f56e93e55796 (patch) | |
| tree | 9a986adb29ff2eb417798e1e27262da8830a2ccc | |
| parent | ecc68904a3e5efb07cb4f0b97d15c7e0e4623d13 (diff) | |
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>
| -rw-r--r-- | include/uapi/linux/audit.h | 1 | ||||
| -rw-r--r-- | kernel/auditfilter.c | 5 | ||||
| -rw-r--r-- | kernel/auditsc.c | 5 |
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: |