[PATCH] audit=0 appears not to completely disable auditing
by Steve Grubb
Hi,
There was a bz, 231371, reporting that current upstream kernels do not completely
disable auditing when boot with audit=0 and the audit daemon not configured to
run. You can reproduce the problem by:
service auditd stop
auditctl -e 0
auditctl -w /etc/passwd
and you'd get an event in syslog:
Mar 9 15:43:04 localhost kernel: audit(1173472984.321:982): auid=4294967295
subj=user_u:system_r:auditctl_t:s0 op=add rule key=(null) list=4 res=1
The patch below solves this problem by checking audit_enabled before creating
an audit event.
Signed-off-by: Steve Grubb <sgrubb(a)redhat.com>
diff -urp linux-2.6.18.x86_64.orig/kernel/audit.c linux-2.6.18.x86_64/kernel/audit.c
--- linux-2.6.18.x86_64.orig/kernel/audit.c 2007-03-09 14:08:18.000000000 -0500
+++ linux-2.6.18.x86_64/kernel/audit.c 2007-03-09 14:06:59.000000000 -0500
@@ -238,46 +238,50 @@ void audit_log_lost(const char *message)
static int audit_set_rate_limit(int limit, uid_t loginuid, u32 sid)
{
- int old = audit_rate_limit;
+ if (audit_enabled) {
+ int old = audit_rate_limit;
- if (sid) {
- char *ctx = NULL;
- u32 len;
- int rc;
- if ((rc = selinux_ctxid_to_string(sid, &ctx, &len)))
- return rc;
- else
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
+ if (sid) {
+ char *ctx = NULL;
+ u32 len;
+ int rc;
+ if ((rc = selinux_ctxid_to_string(sid, &ctx, &len)))
+ return rc;
+ else
+ audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
"audit_rate_limit=%d old=%d by auid=%u subj=%s",
- limit, old, loginuid, ctx);
- kfree(ctx);
- } else
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
- "audit_rate_limit=%d old=%d by auid=%u",
- limit, old, loginuid);
+ limit, old, loginuid, ctx);
+ kfree(ctx);
+ } else
+ audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
+ "audit_rate_limit=%d old=%d by auid=%u",
+ limit, old, loginuid);
+ }
audit_rate_limit = limit;
return 0;
}
static int audit_set_backlog_limit(int limit, uid_t loginuid, u32 sid)
{
- int old = audit_backlog_limit;
+ if (audit_enabled) {
+ int old = audit_backlog_limit;
- if (sid) {
- char *ctx = NULL;
- u32 len;
- int rc;
- if ((rc = selinux_ctxid_to_string(sid, &ctx, &len)))
- return rc;
- else
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
+ if (sid) {
+ char *ctx = NULL;
+ u32 len;
+ int rc;
+ if ((rc = selinux_ctxid_to_string(sid, &ctx, &len)))
+ return rc;
+ else
+ audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
"audit_backlog_limit=%d old=%d by auid=%u subj=%s",
- limit, old, loginuid, ctx);
- kfree(ctx);
- } else
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
- "audit_backlog_limit=%d old=%d by auid=%u",
- limit, old, loginuid);
+ limit, old, loginuid, ctx);
+ kfree(ctx);
+ } else
+ audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
+ "audit_backlog_limit=%d old=%d by auid=%u",
+ limit, old, loginuid);
+ }
audit_backlog_limit = limit;
return 0;
}
@@ -289,21 +293,23 @@ static int audit_set_enabled(int state,
if (state != 0 && state != 1)
return -EINVAL;
- if (sid) {
- char *ctx = NULL;
- u32 len;
- int rc;
- if ((rc = selinux_ctxid_to_string(sid, &ctx, &len)))
- return rc;
- else
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
+ if (audit_enabled || state) {
+ if (sid) {
+ char *ctx = NULL;
+ u32 len;
+ int rc;
+ if ((rc = selinux_ctxid_to_string(sid, &ctx, &len)))
+ return rc;
+ else
+ audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
"audit_enabled=%d old=%d by auid=%u subj=%s",
- state, old, loginuid, ctx);
- kfree(ctx);
- } else
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
- "audit_enabled=%d old=%d by auid=%u",
- state, old, loginuid);
+ state, old, loginuid, ctx);
+ kfree(ctx);
+ } else
+ audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
+ "audit_enabled=%d old=%d by auid=%u",
+ state, old, loginuid);
+ }
audit_enabled = state;
return 0;
}
@@ -317,21 +323,23 @@ static int audit_set_failure(int state,
&& state != AUDIT_FAIL_PANIC)
return -EINVAL;
- if (sid) {
- char *ctx = NULL;
- u32 len;
- int rc;
- if ((rc = selinux_ctxid_to_string(sid, &ctx, &len)))
- return rc;
- else
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
+ if (audit_enabled) {
+ if (sid) {
+ char *ctx = NULL;
+ u32 len;
+ int rc;
+ if ((rc = selinux_ctxid_to_string(sid, &ctx, &len)))
+ return rc;
+ else
+ audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
"audit_failure=%d old=%d by auid=%u subj=%s",
- state, old, loginuid, ctx);
- kfree(ctx);
- } else
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
- "audit_failure=%d old=%d by auid=%u",
- state, old, loginuid);
+ state, old, loginuid, ctx);
+ kfree(ctx);
+ } else
+ audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
+ "audit_failure=%d old=%d by auid=%u",
+ state, old, loginuid);
+ }
audit_failure = state;
return 0;
}
@@ -536,22 +544,26 @@ static int audit_receive_msg(struct sk_b
if (err < 0) return err;
}
if (status_get->mask & AUDIT_STATUS_PID) {
- int old = audit_pid;
- if (sid) {
- if ((err = selinux_ctxid_to_string(
- sid, &ctx, &len)))
- return err;
- else
+ if (audit_enabled) {
+ int old = audit_pid;
+ if (sid) {
+ if ((err = selinux_ctxid_to_string(
+ sid, &ctx, &len)))
+ return err;
+ else
+ audit_log(NULL, GFP_KERNEL,
+ AUDIT_CONFIG_CHANGE,
+ "audit_pid=%d old=%d by auid=%u subj=%s",
+ status_get->pid, old,
+ loginuid, ctx);
+ kfree(ctx);
+ } else
audit_log(NULL, GFP_KERNEL,
AUDIT_CONFIG_CHANGE,
- "audit_pid=%d old=%d by auid=%u subj=%s",
- status_get->pid, old,
- loginuid, ctx);
- kfree(ctx);
- } else
- audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
"audit_pid=%d old=%d by auid=%u",
- status_get->pid, old, loginuid);
+ status_get->pid, old,
+ loginuid);
+ }
audit_pid = status_get->pid;
}
if (status_get->mask & AUDIT_STATUS_RATE_LIMIT)
diff -urp linux-2.6.18.x86_64.orig/kernel/auditfilter.c linux-2.6.18.x86_64/kernel/auditfilter.c
--- linux-2.6.18.x86_64.orig/kernel/auditfilter.c 2007-03-09 14:08:18.000000000 -0500
+++ linux-2.6.18.x86_64/kernel/auditfilter.c 2007-03-09 14:05:54.000000000 -0500
@@ -95,6 +95,8 @@ extern struct inotify_handle *audit_ih;
/* Inotify events we care about. */
#define AUDIT_IN_WATCH IN_MOVE|IN_CREATE|IN_DELETE|IN_DELETE_SELF|IN_MOVE_SELF
+extern int audit_enabled;
+
void audit_free_parent(struct inotify_watch *i_watch)
{
struct audit_parent *parent;
@@ -897,7 +899,6 @@ static void audit_update_watch(struct au
struct audit_watch *owatch, *nwatch, *nextw;
struct audit_krule *r, *nextr;
struct audit_entry *oentry, *nentry;
- struct audit_buffer *ab;
mutex_lock(&audit_filter_mutex);
list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) {
@@ -937,13 +938,18 @@ static void audit_update_watch(struct au
call_rcu(&oentry->rcu, audit_free_rule_rcu);
}
- ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
- audit_log_format(ab, "op=updated rules specifying path=");
- audit_log_untrustedstring(ab, owatch->path);
- audit_log_format(ab, " with dev=%u ino=%lu\n", dev, ino);
- audit_log_format(ab, " list=%d res=1", r->listnr);
- audit_log_end(ab);
-
+ if (audit_enabled) {
+ struct audit_buffer *ab;
+ ab = audit_log_start(NULL, GFP_KERNEL,
+ AUDIT_CONFIG_CHANGE);
+ audit_log_format(ab,
+ "op=updated rules specifying path=");
+ audit_log_untrustedstring(ab, owatch->path);
+ audit_log_format(ab, " with dev=%u ino=%lu\n",
+ dev, ino);
+ audit_log_format(ab, " list=%d res=1", r->listnr);
+ audit_log_end(ab);
+ }
audit_remove_watch(owatch);
goto add_watch_to_parent; /* event applies to a single watch */
}
@@ -962,25 +968,28 @@ static void audit_remove_parent_watches(
struct audit_watch *w, *nextw;
struct audit_krule *r, *nextr;
struct audit_entry *e;
- struct audit_buffer *ab;
mutex_lock(&audit_filter_mutex);
parent->flags |= AUDIT_PARENT_INVALID;
list_for_each_entry_safe(w, nextw, &parent->watches, wlist) {
list_for_each_entry_safe(r, nextr, &w->rules, rlist) {
e = container_of(r, struct audit_entry, rule);
-
- ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
- audit_log_format(ab, "op=remove rule path=");
- audit_log_untrustedstring(ab, w->path);
- if (r->filterkey) {
- audit_log_format(ab, " key=");
- audit_log_untrustedstring(ab, r->filterkey);
- } else
- audit_log_format(ab, " key=(null)");
- audit_log_format(ab, " list=%d res=1", r->listnr);
- audit_log_end(ab);
-
+ if (audit_enabled) {
+ struct audit_buffer *ab;
+ ab = audit_log_start(NULL, GFP_KERNEL,
+ AUDIT_CONFIG_CHANGE);
+ audit_log_format(ab, "op=remove rule path=");
+ audit_log_untrustedstring(ab, w->path);
+ if (r->filterkey) {
+ audit_log_format(ab, " key=");
+ audit_log_untrustedstring(ab,
+ r->filterkey);
+ } else
+ audit_log_format(ab, " key=(null)");
+ audit_log_format(ab, " list=%d res=1",
+ r->listnr);
+ audit_log_end(ab);
+ }
list_del(&r->rlist);
list_del_rcu(&e->list);
call_rcu(&e->rcu, audit_free_rule_rcu);
@@ -1409,6 +1418,9 @@ static void audit_log_rule_change(uid_t
{
struct audit_buffer *ab;
+ if (!audit_enabled)
+ return;
+
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
if (!ab)
return;
17 years, 8 months
[PATCH] Make IPC mode consistent
by Steve Grubb
Hi,
The mode fields for IPC records are not consistent. Some are hex, others are
octal. This patch makes them all octal.
Signed-off-by: Steve Grubb <sgrubb(a)redhat.com>
diff -urp linux-2.6.18.i686.orig/kernel/auditsc.c linux-2.6.18.i686/kernel/auditsc.c
--- linux-2.6.18.i686.orig/kernel/auditsc.c 2007-05-29 10:27:13.000000000 -0400
+++ linux-2.6.18.i686/kernel/auditsc.c 2007-05-29 10:33:07.000000000 -0400
@@ -941,7 +941,7 @@ static void audit_log_exit(struct audit_
case AUDIT_IPC: {
struct audit_aux_data_ipcctl *axi = (void *)aux;
audit_log_format(ab,
- "ouid=%u ogid=%u mode=%x",
+ "ouid=%u ogid=%u mode=%#o",
axi->uid, axi->gid, axi->mode);
if (axi->osid != 0) {
char *ctx = NULL;
@@ -960,7 +960,7 @@ static void audit_log_exit(struct audit_
case AUDIT_IPC_SET_PERM: {
struct audit_aux_data_ipcctl *axi = (void *)aux;
audit_log_format(ab,
- "qbytes=%lx ouid=%u ogid=%u mode=%x",
+ "qbytes=%lx ouid=%u ogid=%u mode=%#o",
axi->qbytes, axi->uid, axi->gid, axi->mode);
break; }
17 years, 11 months
Re: ssh in SLES10 SP1 RC2
by Michael Folsom
Folks:
Thanks!
Checked and SLES10/SLED10 SP1 rc2 and rc3 are both running openssh 4.2p1-18.
Looks like monitoring logouts won't happen in Suse Enterprise land
till SSH get reved to a newer version!
Be well,
Michael
On 5/25/07, Wieprecht, Karen M. <Karen.Wieprecht(a)jhuapl.edu> wrote:
> Yep, based on some earlier emails I saved, I think Steve said that
> ssh needs to be at version 4.3p2-13 or later to generate logout
> (USER_END) audit records correctly.
>
> Karen Wieprecht
>
>
18 years
Identifying writes to NFS
by Matthew Booth
I'd like to be able to reliably recognise a PATH record which refers to
an NFS mount. It seems that dev=00:xx would be related to the answer.
However, each mount seems to have its own value of xx, and other mounts
not backed by a block device, eg /proc and /dev, also have dev=00:xx.
The answer can't be related to a single system, as the solution has to
be rolled out across a large estate with a variety of nfs mounts on
particular servers.
Any ideas? Thanks,
Matt
--
Matthew Booth, RHCA, RHCSS
Red Hat, Global Professional Services
M: +44 (0)7977 267231
GPG ID: D33C3490
GPG FPR: 3733 612D 2D05 5458 8A8A 1600 3441 EA19 D33C 3490
18 years
AUDIT_AVC_PATH problems
by Alexander Viro
Selinux folks had been complaining about the lack of AVC_PATH
records when audit is disabled. I must admit my stupidity - I assumed
that avc_audit() really couldn't use audit_log_d_path() because of
deadlocks (== could be called with dcache_lock or vfsmount_lock held).
Shouldn't have made that assumption - it never gets called that way.
It _is_ called under spinlocks, but not those.
Since audit_log_d_path() uses ab->gfp_mask for allocations, kmalloc()
in there is not a problem. IOW, the simple fix should be sufficient: let's
rip AUDIT_AVC_PATH out and simply generate pathname as part of main record.
It's trivial to do. Patch below is against the mainline, rhel5 variant
is also trivial.
Comments?
diff --git a/include/linux/audit.h b/include/linux/audit.h
index fccc6e5..f3d6e5f 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -399,7 +399,6 @@ extern int audit_bprm(struct linux_binprm *bprm);
extern int audit_socketcall(int nargs, unsigned long *args);
extern int audit_sockaddr(int len, void *addr);
extern int __audit_fd_pair(int fd1, int fd2);
-extern int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt);
extern int audit_set_macxattr(const char *name);
extern int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr);
extern int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec __user *u_abs_timeout);
@@ -479,7 +478,6 @@ extern int audit_signals;
#define audit_socketcall(n,a) ({ 0; })
#define audit_fd_pair(n,a) ({ 0; })
#define audit_sockaddr(len, addr) ({ 0; })
-#define audit_avc_path(dentry, mnt) ({ 0; })
#define audit_set_macxattr(n) do { ; } while (0)
#define audit_mq_open(o,m,a) ({ 0; })
#define audit_mq_timedsend(d,l,p,t) ({ 0; })
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index e36481e..10e0e6e 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -176,12 +176,6 @@ struct audit_aux_data_fd_pair {
int fd[2];
};
-struct audit_aux_data_path {
- struct audit_aux_data d;
- struct dentry *dentry;
- struct vfsmount *mnt;
-};
-
struct audit_aux_data_pids {
struct audit_aux_data d;
pid_t target_pid[AUDIT_AUX_PIDS];
@@ -657,12 +651,6 @@ static inline void audit_free_aux(struct audit_context *context)
struct audit_aux_data *aux;
while ((aux = context->aux)) {
- if (aux->type == AUDIT_AVC_PATH) {
- struct audit_aux_data_path *axi = (void *)aux;
- dput(axi->dentry);
- mntput(axi->mnt);
- }
-
context->aux = aux->next;
kfree(aux);
}
@@ -998,11 +986,6 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
audit_log_hex(ab, axs->a, axs->len);
break; }
- case AUDIT_AVC_PATH: {
- struct audit_aux_data_path *axi = (void *)aux;
- audit_log_d_path(ab, "path=", axi->dentry, axi->mnt);
- break; }
-
case AUDIT_FD_PAIR: {
struct audit_aux_data_fd_pair *axs = (void *)aux;
audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]);
@@ -1952,36 +1935,6 @@ void __audit_ptrace(struct task_struct *t)
}
/**
- * audit_avc_path - record the granting or denial of permissions
- * @dentry: dentry to record
- * @mnt: mnt to record
- *
- * Returns 0 for success or NULL context or < 0 on error.
- *
- * Called from security/selinux/avc.c::avc_audit()
- */
-int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt)
-{
- struct audit_aux_data_path *ax;
- struct audit_context *context = current->audit_context;
-
- if (likely(!context))
- return 0;
-
- ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
- if (!ax)
- return -ENOMEM;
-
- ax->dentry = dget(dentry);
- ax->mnt = mntget(mnt);
-
- ax->d.type = AUDIT_AVC_PATH;
- ax->d.next = context->aux;
- context->aux = (void *)ax;
- return 0;
-}
-
-/**
* audit_signal_info - record signal info for shutting down audit subsystem
* @sig: signal value
* @t: task being signaled
diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index e4396a8..2f4c2bb 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -570,10 +570,12 @@ void avc_audit(u32 ssid, u32 tsid,
case AVC_AUDIT_DATA_FS:
if (a->u.fs.dentry) {
struct dentry *dentry = a->u.fs.dentry;
- if (a->u.fs.mnt)
- audit_avc_path(dentry, a->u.fs.mnt);
- audit_log_format(ab, " name=");
- audit_log_untrustedstring(ab, dentry->d_name.name);
+ if (a->u.fs.mnt) {
+ audit_log_d_path(ab, "path=", dentry, a->u.fs.mnt);
+ } else {
+ audit_log_format(ab, " name=");
+ audit_log_untrustedstring(ab, dentry->d_name.name);
+ }
inode = dentry->d_inode;
} else if (a->u.fs.inode) {
struct dentry *dentry;
@@ -624,9 +626,8 @@ void avc_audit(u32 ssid, u32 tsid,
case AF_UNIX:
u = unix_sk(sk);
if (u->dentry) {
- audit_avc_path(u->dentry, u->mnt);
- audit_log_format(ab, " name=");
- audit_log_untrustedstring(ab, u->dentry->d_name.name);
+ audit_log_d_path(ab, "path=",
+ u->dentry, u->mnt);
break;
}
if (!u->addr)
18 years
Offline configuration
by Robert Evans
Hi,
Now that I've got auditing to work on Fedora Core, I have a few more questions.
First, the boxes I've got it working on are connected to the internet and have
the latest updates. Now I need to make stuff work on boxes that are *not*
connected to the internet and are built off of the base CD/DVD.
I know I need the latest versions of the following packages on a system
audit
audit-lib
glibc-kernheaders
openssh
openssh-server
openssh-client
openssh-askpass
openssh-askpass-gnome
Do I need the latest of
audit-libs-devel
kernel
as well?
Also, what other packages are critical to get NISPOM compliance? Even when I
updated the above packages, it didn't look like failed logins on the gnome
desktop were generating events. I realize this may be particular to RHEL_64,
but I also figured I could just have an outdated package.
I'm asking this because when I set up my audit rules on RHEL4_64 with the base
auditing installed (none of the above updates). I wasn't getting any
login/logout events at all, based on my initial experience with the initial
Fedora configurations, I assume that I need to install updated packages.
I'm not using watches right now, only syscalls, which seem to catch everything I
need. It seems like Steve has put enough information in the event logs that it
is possible to build a GUI that parses, combines, and then displays the event
logs to the user. Each displayed event is on a single line and contains the
pertinent information about the event.
The only gotcha I had with FC5 was that I needed the updated openssh packages to
generate the events that indicated a logout event for ssh.
Bob Evans
JHU/APL
18 years
Re: monitoring both logins and logouts via ssh in SLES10 SP1 RC2
by Michael Folsom
Steve:
Thanks for the quick response -
Did a little test on a X86-64 SLES10 SP1 RC2 system - sshed into in
and did see the USER_LOGIN line then got out via either an exit or
logout and never see an USER_END statement. Here's the relevant lines
from /var/log/audit/audit.log:
type=USER_AUTH msg=audit(1180108586.633:1292): user pid=31247 uid=0
auid=4294967295 msg='PAM: authentication acct=mwfolsom :
exe="/usr/sbin/sshd" (hostname=X.X.X, addr=X.X.X.X, terminal=ssh
res=success)'
type=USER_ACCT msg=audit(1180108586.633:1293): user pid=31247 uid=0
auid=4294967295 msg='PAM: accounting acct=mwfolsom :
exe="/usr/sbin/sshd" (hostname=X.X.X, addr=X.X.X.X,, terminal=ssh
res=success)'
type=LOGIN msg=audit(1180108586.637:1294): login pid=31248 uid=0 old
auid=4294967295 new auid=6122
type=USER_START msg=audit(1180108586.637:1295): user pid=31248 uid=0
auid=6122 msg='PAM: session open acct=mwfolsom : exe="/usr/sbin/sshd"
(hostname=X.X.X, addr=X.X.X.X, terminal=ssh res=success)'
type=CRED_REFR msg=audit(1180108586.637:1296): user pid=31248 uid=0
auid=6122 msg='PAM: setcred acct=mwfolsom : exe="/usr/sbin/sshd"
(hostname=X.X.X, addr=X.X.X.X, terminal=ssh res=success)'
type=USER_LOGIN msg=audit(1180108586.641:1297): user pid=31245 uid=0
auid=4294967295 msg='uid=6122: exe="/usr/sbin/sshd" (hostname=X.X.X,
addr=X.X.X.X, terminal=/dev/pts/1 res=success)
>From playing with logging in and our via different means - the gdm
gui, the console, and ssh and then using grep on the log file it
appears that the other two routes record both login's and logout's but
ssh only records logins.
Could this be an issue in Suse's implementation of audit?
Thanks!
Michael
On 5/25/07, Steve Grubb <sgrubb(a)redhat.com> wrote:
> On Thursday 24 May 2007 19:07:21 Michael Folsom wrote:
> > Working with audit (ver=1.2.9) on SLES10 sp1 rc2 and wonder if it was
> > possible to monitor both logins and logouts.
>
> Logins are denoted by a USER_LOGIN event. There should also be a USER_START
> event from the same tty/pty or host, auid, and pid. This marks the beginning
> of a session. You should be able to look for a corresponding USER_END to
> denote the end of a session. If USER_START results indicates a failure, there
> will not be a USER_END.
>
> > Currently my system is recording when a user logs in but not when they log
> > out of a ssh session. Is this even possible?
>
> With a little inference, its possible. I started to put in a USER_LOGOUT
> event, but I decided its redundant when it can be inferred by the session
> events.
>
> -Steve
>
18 years
monitoring both logins and logouts via ssh
by Michael Folsom
Hi:
Working with audit (ver=1.2.9) on SLES10 sp1 rc2 and wonder if it was
possible to monitor both logins and logouts. Currently my system is
recording when a user logs in but not when they log out of a ssh
session. Is this even possible?
Thanks -
Michael
18 years
AUDIT Rules
by Paul Whitney
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Can someone tell me what is the correct syntax for successfully or failing
to modify a file using the chmod command? I have :
- -a exit,possible -S chmod -F success=0 -F success!=0
- -a exit,possible -S fchmod -F success=0 -F success!=0
But I am not able to audit the event. As a regular user I try to change the
permissions of /etc/shadow. The action fails (as expected) but does not get
audited.
Any suggestions is greatly appreciated.
Paul Whitney
Information Systems Solutions
paul.whitney(a)mac.com
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18 years
Auditd and Watches
by Simmons Jr,Felix
All,
This is my first post to the list so...be gentle ;) Anyway, I'm trying
to get some monitoring going where I plan on using auditd to monitor
changes to files I deem important. Currently I have a watch on one file
(called important_file), I've given a key so I can find events related
to my one important file. Below is my watch:
[root@XXXX-22 ~]# auditctl -l
No rules
AUDIT_WATCH_LIST: dev=104:2, path=/var/tmp/important_test,
filterkey=test-file, perms=wa, valid=0
I've got no rules in my audit.rules (except -D and the -b 256 default).
My question is this (about time eh?) even though the only rule I have in
my rules is a single watch on a file, I'm getting all sorts of other
events in my /var/log/audit/audit.log. A lot of it are don't care items
at this phase and would only aid in growing my log files. Is there
something I'm missing that can turn off the additional chatter in the
logs? Below are some examples:
type=USER_ACCT msg=audit(05/24/2007 08:44:27.341:8311) : user pid=5633
uid=root auid=unknown(4294967295) msg='PAM accounting:
user=scrubbeduserid exe="/usr/sbin/sshd"
(hostname=cnu448f4g2.edwardjones.com, addr=XXX.XXX.XXX.146, terminal=ssh
result=Success)'
----
type=LOGIN msg=audit(05/24/2007 08:44:27.368:8312) : login pid=5640
uid=root old auid=unknown(4294967295) new auid=scrubbeduserid
----
type=USER_START msg=audit(05/24/2007 08:44:27.370:8313) : user pid=5640
uid=root auid=scrubbeduserid msg='PAM session open: user=scrubbeduserid
exe="/usr/sbin/sshd" (hostname=cnu448f4g2.edwardjones.com,
addr=XXX.XXX.XXX.146, terminal=ssh result=Success)'
----
type=CRED_REFR msg=audit(05/24/2007 08:44:27.373:8314) : user pid=5640
uid=root auid=scrubbeduserid msg='PAM setcred: user=scrubbeduserid
exe="/usr/sbin/sshd" (hostname=cnu448f4g2.edwardjones.com,
addr=XXX.XXX.XXX.146, terminal=ssh result=Success)'
----
type=USER_LOGIN msg=audit(05/24/2007 08:44:27.382:8315) : user pid=5633
uid=root auid=unknown(4294967295) msg='uid=7532: exe="/usr/sbin/sshd"
(hostname=cnu448f4g2.edwardjones.com, addr=XXX.XXX.XXX.146,
terminal=/dev/pts/1 res=success)'
----
type=USER_AUTH msg=audit(05/24/2007 08:44:37.379:8316) : user pid=5698
uid=scrubbeduserid auid=scrubbeduserid msg='PAM authentication:
user=scrubbeduserid exe="/usr/local/bin/priv-escalator"
(hostname=nldg-22.appl.devjones.com, addr=XXX.XXX.XXX.186,
terminal=/dev/pts/1 result=Success)'
----
type=USER_ACCT msg=audit(05/24/2007 08:44:37.384:8317) : user pid=5698
uid=scrubbeduserid auid=scrubbeduserid msg='PAM accounting:
user=scrubbeduserid exe="/usr/local/bin/priv-escalator"
(hostname=nldg-22.appl.devjones.com, addr=XXX.XXX.XXX.186,
terminal=/dev/pts/1 result=Success)'
----
type=USER_AUTH msg=audit(05/24/2007 08:44:41.884:8318) : user pid=5728
uid=root auid=unknown(4294967295) msg='PAM authentication: user=root
exe="/bin/su" (hostname=?, addr=?, terminal=pts/3 result=Success)'
----
type=USER_ACCT msg=audit(05/24/2007 08:44:41.889:8319) : user pid=5728
uid=root auid=unknown(4294967295) msg='PAM accounting: user=root
exe="/bin/su" (hostname=?, addr=?, terminal=pts/3 result=Success)'
----
type=USER_START msg=audit(05/24/2007 08:44:41.890:8320) : user pid=5728
uid=root auid=unknown(4294967295) msg='PAM session open: user=root
exe="/bin/su" (hostname=?, addr=?, terminal=pts/3 result=Success)'
----
type=CRED_ACQ msg=audit(05/24/2007 08:44:41.890:8321) : user pid=5728
uid=root auid=unknown(4294967295) msg='PAM setcred: user=root
exe="/bin/su" (hostname=?, addr=?, terminal=pts/3 result=Success)'
Basically I'm trying to chunk the logs down so my host based ids can
snag the events and alert accordingly. I'm pretty new to linux auditd
and I'm coming from the Solaris BSM Audit school of thought. Steve if
you're reading this, thanks for your time and effort keeping linux
auditd going.
-Felix
18 years
