Re: [RFC PATCH 1/1] libselinux: Revise userspace AVC avc_log() for auditable events.

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On 9/15/20 10:43 AM, Stephen Smalley wrote:
On Tue, Sep 15, 2020 at 10:33 AM Chris PeBenito
<chpebeni@xxxxxxxxxxxxxxxxxxx> wrote:

On 9/15/20 9:34 AM, Stephen Smalley wrote:
On Tue, Sep 15, 2020 at 9:11 AM Chris PeBenito
<chpebeni@xxxxxxxxxxxxxxxxxxx> wrote:
diff --git a/libselinux/src/avc_internal.c b/libselinux/src/avc_internal.c
index 572b2159..35ea59b6 100644
--- a/libselinux/src/avc_internal.c
+++ b/libselinux/src/avc_internal.c
@@ -59,14 +59,14 @@ int avc_process_setenforce(int enforcing)
          int rc = 0;

          avc_log(SELINUX_SETENFORCE,
-               "%s:  received setenforce notice (enforcing=%d)\n",
+               "%s:  op=setenforce lsm=selinux_uavc enforcing=%d res=1",
                  avc_prefix, enforcing);
          if (avc_setenforce)
                  goto out;
          avc_enforcing = enforcing;
          if (avc_enforcing && (rc = avc_ss_reset(0)) < 0) {
                  avc_log(SELINUX_ERROR,
-                       "%s:  cache reset returned %d (errno %d)\n",
+                       "%s:  op=cache_reset lsm=selinux_uavc rc=%d errno=%d res=0",
                          avc_prefix, rc, errno);

If we do this at all, I would think the op= would still be setenforce
and this would just be an error for it.

At this point we already audited success for the setenforce operation.  Wouldn't
it be confusing to have a op=setenforce res=1 and then immediately op=setenforce
res=0?

Yes.  On second thought, I don't think any of the SELINUX_ERROR
messages are intended for audit and since that is already a different
type value, the callbacks can already redirect those to stderr or
syslog as appropriate instead of audit.

Are the typebounds and validatetrans in UAVC passed to the kernel for evaluation? The kernel audits failures on those as SELINUX_ERR. If the UAVC handles them itself, it seems that those failures should be audited as USER_SELINUX_ERR.


--
Chris PeBenito



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