AUDIT: Add message types to audit records

This patch adds more messages types to the audit subsystem so that audit 
analysis is quicker, intuitive, and more useful.

Signed-off-by: Steve Grubb <sgrubb@redhat.com>
---
I forgot one type in the big patch. I need to add one for user space 
originating SE Linux avc messages. This is used by dbus and nscd.

-Steve
---
Updated to 2.6.12-rc4-mm1.
-dwmw2

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 55 insertions, 23 deletions

diff --git a/kernel/audit.c b/kernel/audit.c
index 187164572bd0..4e940c05ede8 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -140,6 +140,12 @@ struct audit_buffer {
         struct audit_context *ctx;      /* NULL or associated context */
 };
 
+static void audit_set_pid(struct audit_buffer *ab, pid_t pid)
+{
+        struct nlmsghdr *nlh = (struct nlmsghdr *)ab->skb->data;
+        nlh->nlmsg_pid = pid;
+}
+
 struct audit_entry {
         struct list_head  list;
         struct audit_rule rule;
@@ -233,7 +239,8 @@ static int audit_set_rate_limit(int limit, uid_t loginuid)
 {
         int old          = audit_rate_limit;
         audit_rate_limit = limit;
-        audit_log(NULL, "audit_rate_limit=%d old=%d by auid %u",
+        audit_log(NULL, AUDIT_CONFIG_CHANGE, 
+                        "audit_rate_limit=%d old=%d by auid %u",
                         audit_rate_limit, old, loginuid);
         return old;
 }
@@ -242,7 +249,8 @@ static int audit_set_backlog_limit(int limit, uid_t loginuid)
 {
         int old          = audit_backlog_limit;
         audit_backlog_limit = limit;
-        audit_log(NULL, "audit_backlog_limit=%d old=%d by auid %u",
+        audit_log(NULL, AUDIT_CONFIG_CHANGE,
+                        "audit_backlog_limit=%d old=%d by auid %u",
                         audit_backlog_limit, old, loginuid);
         return old;
 }
@@ -253,8 +261,9 @@ static int audit_set_enabled(int state, uid_t loginuid)
         if (state != 0 && state != 1)
                 return -EINVAL;
         audit_enabled = state;
-        audit_log(NULL, "audit_enabled=%d old=%d by auid %u",
-                  audit_enabled, old, loginuid);
+        audit_log(NULL, AUDIT_CONFIG_CHANGE,
+                        "audit_enabled=%d old=%d by auid %u",
+                        audit_enabled, old, loginuid);
         return old;
 }
 
@@ -266,8 +275,9 @@ static int audit_set_failure(int state, uid_t loginuid)
             && state != AUDIT_FAIL_PANIC)
                 return -EINVAL;
         audit_failure = state;
-        audit_log(NULL, "audit_failure=%d old=%d by auid %u",
-                  audit_failure, old, loginuid);
+        audit_log(NULL, AUDIT_CONFIG_CHANGE,
+                        "audit_failure=%d old=%d by auid %u",
+                        audit_failure, old, loginuid);
         return old;
 }
 
@@ -316,6 +326,14 @@ static int audit_netlink_ok(kernel_cap_t eff_cap, u16 msg_type)
                         err = -EPERM;
                 break;
         case AUDIT_USER:
+        case AUDIT_USER_AUTH:
+        case AUDIT_USER_ACCT:
+        case AUDIT_USER_MGMT:
+        case AUDIT_CRED_ACQ:
+        case AUDIT_CRED_DISP:
+        case AUDIT_USER_START:
+        case AUDIT_USER_END:
+        case AUDIT_USER_AVC:
                 if (!cap_raised(eff_cap, CAP_AUDIT_WRITE))
                         err = -EPERM;
                 break;
@@ -332,6 +350,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
         void                    *data;
         struct audit_status     *status_get, status_set;
         int                     err;
+        struct audit_buffer     *ab;
         u16                     msg_type = nlh->nlmsg_type;
         uid_t                   loginuid; /* loginuid of sender */
         struct audit_sig_info   sig_data;
@@ -373,7 +392,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
                 if (status_get->mask & AUDIT_STATUS_PID) {
                         int old   = audit_pid;
                         audit_pid = status_get->pid;
-                        audit_log(NULL, "audit_pid=%d old=%d by auid %u",
+                        audit_log(NULL, AUDIT_CONFIG_CHANGE,
+                                "audit_pid=%d old=%d by auid %u",
                                   audit_pid, old, loginuid);
                 }
                 if (status_get->mask & AUDIT_STATUS_RATE_LIMIT)
@@ -383,13 +403,26 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
                                                         loginuid);
                 break;
         case AUDIT_USER:
-                audit_log_type(NULL, AUDIT_USER, pid,
+        case AUDIT_USER_AUTH:
+        case AUDIT_USER_ACCT:
+        case AUDIT_USER_MGMT:
+        case AUDIT_CRED_ACQ:
+        case AUDIT_CRED_DISP:
+        case AUDIT_USER_START:
+        case AUDIT_USER_END:
+        case AUDIT_USER_AVC:
+                ab = audit_log_start(NULL, msg_type);
+                if (!ab)
+                        break;  /* audit_panic has been called */
+                audit_log_format(ab,
                                  "user pid=%d uid=%d length=%d loginuid=%u"
                                  " msg='%.1024s'",
                                  pid, uid,
                                  (int)(nlh->nlmsg_len
                                        - ((char *)data - (char *)nlh)),
                                  loginuid, (char *)data);
+                audit_set_pid(ab, pid);
+                audit_log_end(ab);
                 break;
         case AUDIT_ADD:
         case AUDIT_DEL:
@@ -504,7 +537,7 @@ static int __init audit_init(void)
 
         audit_initialized = 1;
         audit_enabled = audit_default;
-        audit_log(NULL, "initialized");
+        audit_log(NULL, AUDIT_KERNEL, "initialized");
         return 0;
 }
 __initcall(audit_init);
@@ -541,10 +574,12 @@ static void audit_buffer_free(struct audit_buffer *ab)
         spin_unlock_irqrestore(&audit_freelist_lock, flags);
 }
 
-static struct audit_buffer * audit_buffer_alloc(int gfp_mask)
+static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
+                                                int gfp_mask, int type)
 {
         unsigned long flags;
         struct audit_buffer *ab = NULL;
+        struct nlmsghdr *nlh;
 
         spin_lock_irqsave(&audit_freelist_lock, flags);
         if (!list_empty(&audit_freelist)) {
@@ -566,6 +601,12 @@ static struct audit_buffer * audit_buffer_alloc(int gfp_mask)
         if (!ab->skb)
                 goto err;
 
+        ab->ctx   = ctx;
+        nlh = (struct nlmsghdr *)skb_put(ab->skb, NLMSG_SPACE(0));
+        nlh->nlmsg_type = type;
+        nlh->nlmsg_flags = 0;
+        nlh->nlmsg_pid = 0;
+        nlh->nlmsg_seq = 0;
         return ab;
 err:
         audit_buffer_free(ab);
@@ -578,12 +619,11 @@ err:
  * syscall, then the syscall is marked as auditable and an audit record
  * will be written at syscall exit.  If there is no associated task, tsk
  * should be NULL. */
-struct audit_buffer *audit_log_start(struct audit_context *ctx, int type, int pid)
+struct audit_buffer *audit_log_start(struct audit_context *ctx, int type)
 {
         struct audit_buffer     *ab     = NULL;
         struct timespec         t;
         unsigned int            serial;
-        struct nlmsghdr *nlh;
 
         if (!audit_initialized)
                 return NULL;
@@ -600,19 +640,12 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, int type, int pi
                 return NULL;
         }
 
-        ab = audit_buffer_alloc(GFP_ATOMIC);
+        ab = audit_buffer_alloc(ctx, GFP_ATOMIC, type);
         if (!ab) {
                 audit_log_lost("out of memory in audit_log_start");
                 return NULL;
         }
 
-        ab->ctx   = ctx;
-        nlh = (struct nlmsghdr *)skb_put(ab->skb, NLMSG_SPACE(0));
-        nlh->nlmsg_type = type;
-        nlh->nlmsg_flags = 0;
-        nlh->nlmsg_pid = pid;
-        nlh->nlmsg_seq = 0;
-
         if (!audit_get_stamp(ab->ctx, &t, &serial)) {
                 t = CURRENT_TIME;
                 serial = 0;
@@ -809,13 +842,12 @@ void audit_log_end(struct audit_buffer *ab)
 /* Log an audit record.  This is a convenience function that calls
  * audit_log_start, audit_log_vformat, and audit_log_end.  It may be
  * called in any context. */
-void audit_log_type(struct audit_context *ctx, int type, int pid,
-                    const char *fmt, ...)
+void audit_log(struct audit_context *ctx, int type, const char *fmt, ...)
 {
         struct audit_buffer *ab;
         va_list args;
 
-        ab = audit_log_start(ctx, type, pid);
+        ab = audit_log_start(ctx, type);
         if (ab) {
                 va_start(args, fmt);
                 audit_log_vformat(ab, fmt, args);