[PATCH] Add audit uid to netlink credentials
Serge E. Hallyn
serue at us.ibm.com
Fri Feb 4 16:58:40 UTC 2005
Most audit control messages are sent over netlink. In order to properly
log the identity of the sender of audit control messages, we would like
to add the loginuid to the netlink_creds structure, as per the attached
patch.
thanks,
-serge
Signed-off-by: Serge Hallyn <serue at us.ibm.com>
Index: linux-2.6.10/include/linux/audit.h
===================================================================
--- linux-2.6.10.orig/include/linux/audit.h 2005-01-27 10:46:57.887036520 -0600
+++ linux-2.6.10/include/linux/audit.h 2005-01-27 10:51:37.408542792 -0600
@@ -145,7 +145,7 @@ extern void audit_inode(const char *name
/* Private API (for audit.c only) */
extern int audit_receive_filter(int type, int pid, int uid, int seq,
- void *data);
+ void *data, uid_t loginuid);
extern void audit_get_stamp(struct audit_context *ctx,
struct timespec *t, int *serial);
extern int audit_set_loginuid(struct audit_context *ctx, uid_t loginuid);
@@ -179,10 +179,10 @@ extern void audit_log_d_path(struct
const char *prefix,
struct dentry *dentry,
struct vfsmount *vfsmnt);
-extern int audit_set_rate_limit(int limit);
-extern int audit_set_backlog_limit(int limit);
-extern int audit_set_enabled(int state);
-extern int audit_set_failure(int state);
+extern int audit_set_rate_limit(int limit, uid_t loginuid);
+extern int audit_set_backlog_limit(int limit, uid_t loginuid);
+extern int audit_set_enabled(int state, uid_t loginuid);
+extern int audit_set_failure(int state, uid_t loginuid);
/* Private API (for auditsc.c only) */
extern void audit_send_reply(int pid, int seq, int type,
Index: linux-2.6.10/include/linux/netlink.h
===================================================================
--- linux-2.6.10.orig/include/linux/netlink.h 2005-01-27 10:46:57.888036368 -0600
+++ linux-2.6.10/include/linux/netlink.h 2005-01-27 10:51:37.409542640 -0600
@@ -110,6 +110,7 @@ struct netlink_skb_parms
__u32 dst_pid;
__u32 dst_groups;
kernel_cap_t eff_cap;
+ __u32 loginuid; /* Login (audit) uid */
};
#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
Index: linux-2.6.10/kernel/audit.c
===================================================================
--- linux-2.6.10.orig/kernel/audit.c 2005-01-27 10:46:57.888036368 -0600
+++ linux-2.6.10/kernel/audit.c 2005-01-27 10:52:28.753737136 -0600
@@ -236,36 +236,36 @@ void audit_log_lost(const char *message)
}
-int audit_set_rate_limit(int limit)
+int audit_set_rate_limit(int limit, uid_t loginuid)
{
int old = audit_rate_limit;
audit_rate_limit = limit;
- audit_log(current->audit_context, "audit_rate_limit=%d old=%d",
- audit_rate_limit, old);
+ audit_log(NULL, "audit_rate_limit=%d old=%d by loginuid %u",
+ audit_rate_limit, old, loginuid);
return old;
}
-int audit_set_backlog_limit(int limit)
+int audit_set_backlog_limit(int limit, uid_t loginuid)
{
int old = audit_backlog_limit;
audit_backlog_limit = limit;
- audit_log(current->audit_context, "audit_backlog_limit=%d old=%d",
- audit_backlog_limit, old);
+ audit_log(NULL, "audit_backlog_limit=%d old=%d by loginuid %u",
+ audit_backlog_limit, old, loginuid);
return old;
}
-int audit_set_enabled(int state)
+int audit_set_enabled(int state, uid_t loginuid)
{
int old = audit_enabled;
if (state != 0 && state != 1)
return -EINVAL;
audit_enabled = state;
- audit_log(current->audit_context, "audit_enabled=%d old=%d",
- audit_enabled, old);
+ audit_log(NULL, "audit_enabled=%d old=%d by loginuid %u",
+ audit_enabled, old, loginuid);
return old;
}
-int audit_set_failure(int state)
+int audit_set_failure(int state, uid_t loginuid)
{
int old = audit_failure;
if (state != AUDIT_FAIL_SILENT
@@ -273,8 +273,8 @@ int audit_set_failure(int state)
&& state != AUDIT_FAIL_PANIC)
return -EINVAL;
audit_failure = state;
- audit_log(current->audit_context, "audit_failure=%d old=%d",
- audit_failure, old);
+ audit_log(NULL, "audit_failure=%d old=%d by loginuid %u",
+ audit_failure, old, loginuid);
return old;
}
@@ -341,6 +341,7 @@ static int audit_receive_msg(struct sk_b
int err;
struct audit_buffer *ab;
u16 msg_type = nlh->nlmsg_type;
+ uid_t loginuid; /* loginuid of sender */
err = audit_netlink_ok(NETLINK_CB(skb).eff_cap, msg_type);
if (err)
@@ -348,6 +349,7 @@ static int audit_receive_msg(struct sk_b
pid = NETLINK_CREDS(skb)->pid;
uid = NETLINK_CREDS(skb)->uid;
+ loginuid = NETLINK_CB(skb).loginuid;
seq = nlh->nlmsg_seq;
data = NLMSG_DATA(nlh);
@@ -368,31 +370,33 @@ static int audit_receive_msg(struct sk_b
return -EINVAL;
status_get = (struct audit_status *)data;
if (status_get->mask & AUDIT_STATUS_ENABLED) {
- err = audit_set_enabled(status_get->enabled);
+ err = audit_set_enabled(status_get->enabled, loginuid);
if (err < 0) return err;
}
if (status_get->mask & AUDIT_STATUS_FAILURE) {
- err = audit_set_failure(status_get->failure);
+ err = audit_set_failure(status_get->failure, loginuid);
if (err < 0) return err;
}
if (status_get->mask & AUDIT_STATUS_PID) {
int old = audit_pid;
audit_pid = status_get->pid;
- audit_log(current->audit_context,
- "audit_pid=%d old=%d", audit_pid, old);
+ audit_log(NULL, "audit_pid=%d old=%d by loginuid %u",
+ audit_pid, old, loginuid);
}
if (status_get->mask & AUDIT_STATUS_RATE_LIMIT)
- audit_set_rate_limit(status_get->rate_limit);
+ audit_set_rate_limit(status_get->rate_limit, loginuid);
if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT)
- audit_set_backlog_limit(status_get->backlog_limit);
+ audit_set_backlog_limit(status_get->backlog_limit,
+ loginuid);
break;
case AUDIT_USER:
ab = audit_log_start(NULL);
if (!ab)
break; /* audit_panic has been called */
audit_log_format(ab,
- "user pid=%d uid=%d length=%d msg='%.1024s'",
- pid, uid,
+ "user pid=%d uid=%d loginuid=%u length=%d"
+ " msg='%.1024s'",
+ pid, uid, loginuid,
(int)(nlh->nlmsg_len
- ((char *)data - (char *)nlh)),
(char *)data);
@@ -408,7 +412,7 @@ static int audit_receive_msg(struct sk_b
case AUDIT_LIST:
#ifdef CONFIG_AUDITSYSCALL
err = audit_receive_filter(nlh->nlmsg_type, pid, uid, seq,
- data);
+ data, loginuid);
#else
err = -EOPNOTSUPP;
#endif
Index: linux-2.6.10/kernel/auditsc.c
===================================================================
--- linux-2.6.10.orig/kernel/auditsc.c 2005-01-27 10:46:57.890036064 -0600
+++ linux-2.6.10/kernel/auditsc.c 2005-01-27 10:52:53.776933032 -0600
@@ -228,7 +228,8 @@ static int audit_copy_rule(struct audit_
return 0;
}
-int audit_receive_filter(int type, int pid, int uid, int seq, void *data)
+int audit_receive_filter(int type, int pid, int uid, int seq, void *data,
+ uid_t loginuid)
{
u32 flags;
struct audit_entry *entry;
@@ -263,6 +264,7 @@ int audit_receive_filter(int type, int p
err = audit_add_rule(entry, &audit_entlist);
if (!err && (flags & AUDIT_AT_EXIT))
err = audit_add_rule(entry, &audit_extlist);
+ audit_log(NULL, "loginuid %u added an audit rule\n", loginuid);
break;
case AUDIT_DEL:
flags =((struct audit_rule *)data)->flags;
@@ -272,6 +274,8 @@ int audit_receive_filter(int type, int p
err = audit_del_rule(data, &audit_entlist);
if (!err && (flags & AUDIT_AT_EXIT))
err = audit_del_rule(data, &audit_extlist);
+ audit_log(NULL, "loginuid %u removed an audit rule\n",
+ loginuid);
break;
default:
return -EINVAL;
Index: linux-2.6.10/net/netlink/af_netlink.c
===================================================================
--- linux-2.6.10.orig/net/netlink/af_netlink.c 2005-01-27 10:46:57.891035912 -0600
+++ linux-2.6.10/net/netlink/af_netlink.c 2005-01-27 10:51:37.411542336 -0600
@@ -928,6 +928,7 @@ static int netlink_sendmsg(struct kiocb
NETLINK_CB(skb).groups = nlk->groups;
NETLINK_CB(skb).dst_pid = dst_pid;
NETLINK_CB(skb).dst_groups = dst_groups;
+ NETLINK_CB(skb).loginuid = audit_get_loginuid(current->audit_context);
memcpy(NETLINK_CREDS(skb), &siocb->scm->creds, sizeof(struct ucred));
/* What can I do? Netlink is asynchronous, so that
More information about the Linux-audit
mailing list