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>

include/linux/audit.h

@@ -27,15 +27,53 @@
 #include <linux/sched.h>
 #include <linux/elf.h>
 
-/* Request and reply types */
+/* The netlink messages for the audit system is divided into blocks:
+ * 1000 - 1099 are for commanding the audit system
+ * 1100 - 1199 user space trusted application messages
+ * 1200 - 1299 messages internal to the audit daemon
+ * 1300 - 1399 audit event messages
+ * 1400 - 1499 SE Linux use
+ * 1500 - 1999 future use
+ * 2000 is for otherwise unclassified kernel audit messages
+ *
+ * Messages from 1000-1199 are bi-directional. 1200-1299 are exclusively user
+ * space. Anything over that is kernel --> user space communication.
+ */
 #define AUDIT_GET		1000	/* Get status */
 #define AUDIT_SET		1001	/* Set status (enable/disable/auditd) */
-#define AUDIT_LIST		1002	/* List filtering rules */
-#define AUDIT_ADD		1003	/* Add filtering rule */
-#define AUDIT_DEL		1004	/* Delete filtering rule */
-#define AUDIT_USER		1005	/* Send a message from user-space */
+#define AUDIT_LIST		1002	/* List syscall filtering rules */
+#define AUDIT_ADD		1003	/* Add syscall filtering rule */
+#define AUDIT_DEL		1004	/* Delete syscall filtering rule */
+#define AUDIT_USER		1005	/* Message from userspace -- deprecated */
 #define AUDIT_LOGIN		1006	/* Define the login id and information */
-#define AUDIT_SIGNAL_INFO	1010	/* Get information about sender of signal*/
+#define AUDIT_WATCH_INS		1007	/* Insert file/dir watch entry */
+#define AUDIT_WATCH_REM		1008	/* Remove file/dir watch entry */
+#define AUDIT_WATCH_LIST	1009	/* List all file/dir watches */
+#define AUDIT_SIGNAL_INFO	1010	/* Get info about sender of signal to auditd */
+
+#define AUDIT_USER_AUTH		1100	/* User space authentication */
+#define AUDIT_USER_ACCT		1101	/* User space acct change */
+#define AUDIT_USER_MGMT		1102	/* User space acct management */
+#define AUDIT_CRED_ACQ		1103	/* User space credential acquired */
+#define AUDIT_CRED_DISP		1104	/* User space credential disposed */
+#define AUDIT_USER_START	1105	/* User space session start */ 
+#define AUDIT_USER_END		1106	/* User space session end */
+#define AUDIT_USER_AVC		1107	/* User space avc message */
+ 
+#define AUDIT_DAEMON_START      1200    /* Daemon startup record */
+#define AUDIT_DAEMON_END        1201    /* Daemon normal stop record */
+#define AUDIT_DAEMON_ABORT      1202    /* Daemon error stop record */
+#define AUDIT_DAEMON_CONFIG     1203    /* Daemon config change */
+
+#define AUDIT_SYSCALL		1300	/* Syscall event */
+#define AUDIT_FS_WATCH		1301	/* Filesystem watch event */
+#define AUDIT_PATH		1302	/* Filname path information */
+#define AUDIT_IPC		1303	/* IPC record */
+#define AUDIT_SOCKET		1304	/* Socket record */
+#define AUDIT_CONFIG_CHANGE	1305	/* Audit system configuration change */
+
+#define AUDIT_AVC		1400	/* SE Linux avc denial or grant */
+#define AUDIT_SELINUX_ERR	1401	/* Internal SE Linux Errors */
 
 #define AUDIT_KERNEL		2000	/* Asynchronous audit record. NOT A REQUEST. */
 
@@ -216,14 +254,11 @@ extern void audit_signal_info(int sig, struct task_struct *t);
 #ifdef CONFIG_AUDIT
 /* These are defined in audit.c */
 				/* Public API */
-#define audit_log(ctx, fmt, args...) \
-	audit_log_type(ctx, AUDIT_KERNEL, 0, fmt, ##args)
-extern void		    audit_log_type(struct audit_context *ctx, int type,
-				      int pid, const char *fmt, ...)
-			    __attribute__((format(printf,4,5)));
+extern void		    audit_log(struct audit_context *ctx, int type,
+				      const char *fmt, ...)
+			    __attribute__((format(printf,3,4)));
 
-extern struct audit_buffer *audit_log_start(struct audit_context *ctx, int type,
-					    int pid);
+extern struct audit_buffer *audit_log_start(struct audit_context *ctx,int type);
 extern void		    audit_log_format(struct audit_buffer *ab,
 					     const char *fmt, ...)
 			    __attribute__((format(printf,2,3)));
@@ -243,9 +278,8 @@ extern void		    audit_send_reply(int pid, int seq, int type,
 					     void *payload, int size);
 extern void		    audit_log_lost(const char *message);
 #else
-#define audit_log(c,f,...) do { ; } while (0)
-#define audit_log_type(c,t,p,f,...) do { ; } while (0)
-#define audit_log_start(c,t,p) ({ NULL; })
+#define audit_log(c,t,f,...) do { ; } while (0)
+#define audit_log_start(c,t) ({ NULL; })
 #define audit_log_vformat(b,f,a) do { ; } while (0)
 #define audit_log_format(b,f,...) do { ; } while (0)
 #define audit_log_end(b) do { ; } while (0)

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);

kernel/auditsc.c

@@ -286,7 +286,8 @@ int audit_receive_filter(int type, int pid, int uid, int seq, void *data,
 			err = audit_add_rule(entry, &audit_entlist);
 		if (!err && (flags & AUDIT_AT_EXIT))
 			err = audit_add_rule(entry, &audit_extlist);
-		audit_log(NULL, "auid %u added an audit rule\n", loginuid);
+		audit_log(NULL, AUDIT_CONFIG_CHANGE, 
+				"auid %u added an audit rule\n", loginuid);
 		break;
 	case AUDIT_DEL:
 		flags =((struct audit_rule *)data)->flags;
@@ -296,7 +297,8 @@ int audit_receive_filter(int type, int pid, int uid, int seq, void *data,
 			err = audit_del_rule(data, &audit_entlist);
 		if (!err && (flags & AUDIT_AT_EXIT))
 			err = audit_del_rule(data, &audit_extlist);
-		audit_log(NULL, "auid %u removed an audit rule\n", loginuid);
+		audit_log(NULL, AUDIT_CONFIG_CHANGE,
+				"auid %u removed an audit rule\n", loginuid);
 		break;
 	default:
 		return -EINVAL;
@@ -648,7 +650,7 @@ static void audit_log_exit(struct audit_context *context)
 	int i;
 	struct audit_buffer *ab;
 
-	ab = audit_log_start(context, AUDIT_KERNEL, 0);
+	ab = audit_log_start(context, AUDIT_SYSCALL);
 	if (!ab)
 		return;		/* audit_panic has been called */
 	audit_log_format(ab, "syscall=%d", context->major);
@@ -680,28 +682,28 @@ static void audit_log_exit(struct audit_context *context)
 	while (context->aux) {
 		struct audit_aux_data *aux;
 
-		ab = audit_log_start(context, AUDIT_KERNEL, 0);
+		aux = context->aux;
+
+		ab = audit_log_start(context, aux->type);
 		if (!ab)
 			continue; /* audit_panic has been called */
 
-		aux = context->aux;
-		context->aux = aux->next;
-
-		audit_log_format(ab, "auxitem=%d", aux->type);
 		switch (aux->type) {
-		case AUDIT_AUX_IPCPERM: {
+		case AUDIT_IPC: {
 			struct audit_aux_data_ipcctl *axi = (void *)aux;
 			audit_log_format(ab, 
-					 " qbytes=%lx uid=%d gid=%d mode=%x",
+					 " qbytes=%lx iuid=%d igid=%d mode=%x",
 					 axi->qbytes, axi->uid, axi->gid, axi->mode);
 			}
 		}
 		audit_log_end(ab);
+
+		context->aux = aux->next;
 		kfree(aux);
 	}
 
 	for (i = 0; i < context->name_count; i++) {
-		ab = audit_log_start(context, AUDIT_KERNEL, 0);
+		ab = audit_log_start(context, AUDIT_PATH);
 		if (!ab)
 			continue; /* audit_panic has been called */
 		audit_log_format(ab, "item=%d", i);
@@ -711,7 +713,7 @@ static void audit_log_exit(struct audit_context *context)
 		}
 		if (context->names[i].ino != (unsigned long)-1)
 			audit_log_format(ab, " inode=%lu dev=%02x:%02x mode=%#o"
-					     " uid=%d gid=%d rdev=%02x:%02x",
+					     " ouid=%d ogid=%d rdev=%02x:%02x",
 					 context->names[i].ino,
 					 MAJOR(context->names[i].dev),
 					 MINOR(context->names[i].dev),
@@ -1008,10 +1010,16 @@ int audit_get_stamp(struct audit_context *ctx,
 int audit_set_loginuid(struct task_struct *task, uid_t loginuid)
 {
 	if (task->audit_context) {
-		audit_log_type(NULL, AUDIT_LOGIN, 0,
-			  "login pid=%d uid=%u old loginuid=%u new loginuid=%u",
-			  task->pid, task->uid, task->audit_context->loginuid,
-			  loginuid);
+		struct audit_buffer *ab;
+
+		ab = audit_log_start(NULL, AUDIT_LOGIN);
+		if (ab) {
+			audit_log_format(ab, "login pid=%d uid=%u "
+				"old loginuid=%u new loginuid=%u",
+				task->pid, task->uid, 
+				task->audit_context->loginuid, loginuid);
+			audit_log_end(ab);
+		}
 		task->audit_context->loginuid = loginuid;
 	}
 	return 0;
@@ -1039,7 +1047,7 @@ int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode)
 	ax->gid = gid;
 	ax->mode = mode;
 
-	ax->d.type = AUDIT_AUX_IPCPERM;
+	ax->d.type = AUDIT_IPC;
 	ax->d.next = context->aux;
 	context->aux = (void *)ax;
 	return 0;

security/selinux/avc.c

@@ -242,7 +242,7 @@ void __init avc_init(void)
 	avc_node_cachep = kmem_cache_create("avc_node", sizeof(struct avc_node),
 					     0, SLAB_PANIC, NULL, NULL);
 
-	audit_log(current->audit_context, "AVC INITIALIZED\n");
+	audit_log(current->audit_context, AUDIT_KERNEL, "AVC INITIALIZED\n");
 }
 
 int avc_get_hash_stats(char *page)
@@ -549,7 +549,7 @@ void avc_audit(u32 ssid, u32 tsid,
 			return;
 	}
 
-	ab = audit_log_start(current->audit_context, AUDIT_KERNEL, 0);
+	ab = audit_log_start(current->audit_context, AUDIT_AVC);
 	if (!ab)
 		return;		/* audit_panic has been called */
 	audit_log_format(ab, "avc:  %s ", denied ? "denied" : "granted");

security/selinux/hooks.c

@@ -3419,7 +3419,7 @@ static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
 	err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm);
 	if (err) {
 		if (err == -EINVAL) {
-			audit_log(current->audit_context,
+			audit_log(current->audit_context, AUDIT_SELINUX_ERR,
 				  "SELinux:  unrecognized netlink message"
 				  " type=%hu for sclass=%hu\n",
 				  nlh->nlmsg_type, isec->sclass);

security/selinux/nlmsgtab.c

@@ -98,6 +98,14 @@ static struct nlmsg_perm nlmsg_audit_perms[] =
 	{ AUDIT_DEL,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 	{ AUDIT_USER,		NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
 	{ AUDIT_SIGNAL_INFO,	NETLINK_AUDIT_SOCKET__NLMSG_READ     },
+	{ AUDIT_USER_AUTH,	NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
+	{ AUDIT_USER_ACCT,	NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
+	{ AUDIT_USER_MGMT,	NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
+	{ AUDIT_CRED_ACQ,	NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
+	{ AUDIT_CRED_DISP,	NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
+	{ AUDIT_USER_START,	NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
+	{ AUDIT_USER_END,	NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
+	{ AUDIT_USER_AVC,	NETLINK_AUDIT_SOCKET__NLMSG_RELAY    },
 };
 
 

security/selinux/ss/services.c

@@ -365,7 +365,7 @@ static int security_validtrans_handle_fail(struct context *ocontext,
 		goto out;
 	if (context_struct_to_string(tcontext, &t, &tlen) < 0)
 		goto out;
-	audit_log(current->audit_context,
+	audit_log(current->audit_context, AUDIT_SELINUX_ERR,
 	          "security_validate_transition:  denied for"
 	          " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s",
 	          o, n, t, policydb.p_class_val_to_name[tclass-1]);
@@ -742,7 +742,7 @@ static int compute_sid_handle_invalid_context(
 		goto out;
 	if (context_struct_to_string(newcontext, &n, &nlen) < 0)
 		goto out;
-	audit_log(current->audit_context,
+	audit_log(current->audit_context, AUDIT_SELINUX_ERR,
 		  "security_compute_sid:  invalid context %s"
 		  " for scontext=%s"
 		  " tcontext=%s"