Audit: add support to match lsm labels on user audit messages

From: Miloslav Trmac <mitr(a)redhat.com&gt; Add support for matching by security label (e.g. SELinux context) of the sender of an user-space audit record. The audit filter code already allows user space to configure such filters, but they were ignored during evaluation. This patch implements evaluation of these filters. For example, after application of this patch, PAM authentication logs caused by cron can be disabled using auditctl -a user,never -F subj_type=crond_t Signed-off-by: Miloslav Trmac <mitr(a)redhat.com&gt; Acked-by: Eric Paris <eparis(a)redhat.com&gt; --- This patch was actually sent to list back on Nov 9, 2009 but accidentally got dropped on the floor. I am resending the patch in hopes that it will not get lost for the next merge window. kernel/auditfilter.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c index a706040..50307c1 100644 --- a/kernel/auditfilter.c +++ b/kernel/auditfilter.c @@ -1259,6 +1259,18 @@ static int audit_filter_user_rules(struct netlink_skb_parms *cb, case AUDIT_LOGINUID: result = audit_comparator(cb->loginuid, f->op, f->val); break; + case AUDIT_SUBJ_USER: + case AUDIT_SUBJ_ROLE: + case AUDIT_SUBJ_TYPE: + case AUDIT_SUBJ_SEN: + case AUDIT_SUBJ_CLR: + if (f->lsm_rule) + result = security_audit_rule_match(cb->sid, + f->type, + f->op, + f->lsm_rule, + NULL); + break; } if (!result)