[NetLabel]: audit fixups due to delayed feedback

Fix some issues Steve Grubb had with the way NetLabel was using the audit
subsystem.  This should make NetLabel more consistent with other kernel
generated audit messages specifying configuration changes.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Acked-by: Steve Grubb <sgrubb@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 141 insertions, 140 deletions

diff --git a/net/netlabel/netlabel_cipso_v4.c b/net/netlabel/netlabel_cipso_v4.c
index 09986ca..a6ce1d6 100644
--- a/net/netlabel/netlabel_cipso_v4.c
+++ b/net/netlabel/netlabel_cipso_v4.c
@@ -384,11 +384,15 @@ static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
 	u32 doi;
 	const char *type_str = "(unknown)";
 	struct audit_buffer *audit_buf;
+	struct netlbl_audit audit_info;
 
 	if (!info->attrs[NLBL_CIPSOV4_A_DOI] ||
 	    !info->attrs[NLBL_CIPSOV4_A_MTYPE])
 		return -EINVAL;
 
+	doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
+	netlbl_netlink_auditinfo(skb, &audit_info);
+
 	type = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_MTYPE]);
 	switch (type) {
 	case CIPSO_V4_MAP_STD:
@@ -401,13 +405,14 @@ static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
 		break;
 	}
 
-	if (ret_val == 0) {
-		doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
-		audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_ADD,
-						      NETLINK_CB(skb).sid);
-		audit_log_format(audit_buf, " doi=%u type=%s", doi, type_str);
-		audit_log_end(audit_buf);
-	}
+	audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_ADD,
+					      &audit_info);
+	audit_log_format(audit_buf,
+			 " cipso_doi=%u cipso_type=%s res=%u",
+			 doi,
+			 type_str,
+			 ret_val == 0 ? 1 : 0);
+	audit_log_end(audit_buf);
 
 	return ret_val;
 }
@@ -668,20 +673,25 @@ static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
 	int ret_val = -EINVAL;
 	u32 doi = 0;
 	struct audit_buffer *audit_buf;
+	struct netlbl_audit audit_info;
 
-	if (info->attrs[NLBL_CIPSOV4_A_DOI]) {
-		doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
-		ret_val = cipso_v4_doi_remove(doi,
-					      NETLINK_CB(skb).sid,
-					      netlbl_cipsov4_doi_free);
-	}
+	if (!info->attrs[NLBL_CIPSOV4_A_DOI])
+		return -EINVAL;
 
-	if (ret_val == 0) {
-		audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_DEL,
-						      NETLINK_CB(skb).sid);
-		audit_log_format(audit_buf, " doi=%u", doi);
-		audit_log_end(audit_buf);
-	}
+	doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
+	netlbl_netlink_auditinfo(skb, &audit_info);
+
+	ret_val = cipso_v4_doi_remove(doi,
+				      &audit_info,
+				      netlbl_cipsov4_doi_free);
+
+	audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_DEL,
+					      &audit_info);
+	audit_log_format(audit_buf,
+			 " cipso_doi=%u res=%u",
+			 doi,
+			 ret_val == 0 ? 1 : 0);
+	audit_log_end(audit_buf);
 
 	return ret_val;
 }
diff --git a/net/netlabel/netlabel_domainhash.c b/net/netlabel/netlabel_domainhash.c
index d64e2ae..af4371d 100644
--- a/net/netlabel/netlabel_domainhash.c
+++ b/net/netlabel/netlabel_domainhash.c
@@ -188,7 +188,7 @@ int netlbl_domhsh_init(u32 size)
 /**
  * netlbl_domhsh_add - Adds a entry to the domain hash table
  * @entry: the entry to add
- * @audit_secid: the LSM secid to use in the audit message
+ * @audit_info: NetLabel audit information
  *
  * Description:
  * Adds a new entry to the domain hash table and handles any updates to the
@@ -196,7 +196,8 @@ int netlbl_domhsh_init(u32 size)
  * negative on failure.
  *
  */
-int netlbl_domhsh_add(struct netlbl_dom_map *entry, u32 audit_secid)
+int netlbl_domhsh_add(struct netlbl_dom_map *entry,
+		      struct netlbl_audit *audit_info)
 {
 	int ret_val;
 	u32 bkt;
@@ -241,26 +242,26 @@ int netlbl_domhsh_add(struct netlbl_dom_map *entry, u32 audit_secid)
 		spin_unlock(&netlbl_domhsh_def_lock);
 	} else
 		ret_val = -EINVAL;
-	if (ret_val == 0) {
-		if (entry->domain != NULL)
-			audit_domain = entry->domain;
-		else
-			audit_domain = "(default)";
-		audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_ADD,
-						      audit_secid);
-		audit_log_format(audit_buf, " domain=%s", audit_domain);
-		switch (entry->type) {
-		case NETLBL_NLTYPE_UNLABELED:
-			audit_log_format(audit_buf, " protocol=unlbl");
-			break;
-		case NETLBL_NLTYPE_CIPSOV4:
-			audit_log_format(audit_buf,
-					 " protocol=cipsov4 doi=%u",
-					 entry->type_def.cipsov4->doi);
-			break;
-		}
-		audit_log_end(audit_buf);
+
+	if (entry->domain != NULL)
+		audit_domain = entry->domain;
+	else
+		audit_domain = "(default)";
+	audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_ADD, audit_info);
+	audit_log_format(audit_buf, " nlbl_domain=%s", audit_domain);
+	switch (entry->type) {
+	case NETLBL_NLTYPE_UNLABELED:
+		audit_log_format(audit_buf, " nlbl_protocol=unlbl");
+		break;
+	case NETLBL_NLTYPE_CIPSOV4:
+		audit_log_format(audit_buf,
+				 " nlbl_protocol=cipsov4 cipso_doi=%u",
+				 entry->type_def.cipsov4->doi);
+		break;
 	}
+	audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
+	audit_log_end(audit_buf);
+
 	rcu_read_unlock();
 
 	if (ret_val != 0) {
@@ -279,7 +280,7 @@ int netlbl_domhsh_add(struct netlbl_dom_map *entry, u32 audit_secid)
 /**
  * netlbl_domhsh_add_default - Adds the default entry to the domain hash table
  * @entry: the entry to add
- * @audit_secid: the LSM secid to use in the audit message
+ * @audit_info: NetLabel audit information
  *
  * Description:
  * Adds a new default entry to the domain hash table and handles any updates
@@ -287,15 +288,16 @@ int netlbl_domhsh_add(struct netlbl_dom_map *entry, u32 audit_secid)
  * negative on failure.
  *
  */
-int netlbl_domhsh_add_default(struct netlbl_dom_map *entry, u32 audit_secid)
+int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
+			      struct netlbl_audit *audit_info)
 {
-	return netlbl_domhsh_add(entry, audit_secid);
+	return netlbl_domhsh_add(entry, audit_info);
 }
 
 /**
  * netlbl_domhsh_remove - Removes an entry from the domain hash table
  * @domain: the domain to remove
- * @audit_secid: the LSM secid to use in the audit message
+ * @audit_info: NetLabel audit information
  *
  * Description:
  * Removes an entry from the domain hash table and handles any updates to the
@@ -303,7 +305,7 @@ int netlbl_domhsh_add_default(struct netlbl_dom_map *entry, u32 audit_secid)
  * negative on failure.
  *
  */
-int netlbl_domhsh_remove(const char *domain, u32 audit_secid)
+int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info)
 {
 	int ret_val = -ENOENT;
 	struct netlbl_dom_map *entry;
@@ -345,18 +347,20 @@ int netlbl_domhsh_remove(const char *domain, u32 audit_secid)
 			ret_val = -ENOENT;
 		spin_unlock(&netlbl_domhsh_def_lock);
 	}
-	if (ret_val == 0) {
-		if (entry->domain != NULL)
-			audit_domain = entry->domain;
-		else
-			audit_domain = "(default)";
-		audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL,
-						      audit_secid);
-		audit_log_format(audit_buf, " domain=%s", audit_domain);
-		audit_log_end(audit_buf);
 
+	if (entry->domain != NULL)
+		audit_domain = entry->domain;
+	else
+		audit_domain = "(default)";
+	audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info);
+	audit_log_format(audit_buf,
+			 " nlbl_domain=%s res=%u",
+			 audit_domain,
+			 ret_val == 0 ? 1 : 0);
+	audit_log_end(audit_buf);
+
+	if (ret_val == 0)
 		call_rcu(&entry->rcu, netlbl_domhsh_free_entry);
-	}
 
 remove_return:
 	rcu_read_unlock();
@@ -365,7 +369,7 @@ remove_return:
 
 /**
  * netlbl_domhsh_remove_default - Removes the default entry from the table
- * @audit_secid: the LSM secid to use in the audit message
+ * @audit_info: NetLabel audit information
  *
  * Description:
  * Removes/resets the default entry for the domain hash table and handles any
@@ -373,9 +377,9 @@ remove_return:
  * success, non-zero on failure.
  *
  */
-int netlbl_domhsh_remove_default(u32 audit_secid)
+int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info)
 {
-	return netlbl_domhsh_remove(NULL, audit_secid);
+	return netlbl_domhsh_remove(NULL, audit_info);
 }
 
 /**
diff --git a/net/netlabel/netlabel_domainhash.h b/net/netlabel/netlabel_domainhash.h
index d50f13c..3689956 100644
--- a/net/netlabel/netlabel_domainhash.h
+++ b/net/netlabel/netlabel_domainhash.h
@@ -57,9 +57,11 @@ struct netlbl_dom_map {
 int netlbl_domhsh_init(u32 size);
 
 /* Manipulate the domain hash table */
-int netlbl_domhsh_add(struct netlbl_dom_map *entry, u32 audit_secid);
-int netlbl_domhsh_add_default(struct netlbl_dom_map *entry, u32 audit_secid);
-int netlbl_domhsh_remove_default(u32 audit_secid);
+int netlbl_domhsh_add(struct netlbl_dom_map *entry,
+		      struct netlbl_audit *audit_info);
+int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
+			      struct netlbl_audit *audit_info);
+int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info);
 struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain);
 int netlbl_domhsh_walk(u32 *skip_bkt,
 		     u32 *skip_chain,
diff --git a/net/netlabel/netlabel_mgmt.c b/net/netlabel/netlabel_mgmt.c
index 0ac314f..53c9079a 100644
--- a/net/netlabel/netlabel_mgmt.c
+++ b/net/netlabel/netlabel_mgmt.c
@@ -87,11 +87,14 @@ static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
 	struct netlbl_dom_map *entry = NULL;
 	size_t tmp_size;
 	u32 tmp_val;
+	struct netlbl_audit audit_info;
 
 	if (!info->attrs[NLBL_MGMT_A_DOMAIN] ||
 	    !info->attrs[NLBL_MGMT_A_PROTOCOL])
 		goto add_failure;
 
+	netlbl_netlink_auditinfo(skb, &audit_info);
+
 	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 	if (entry == NULL) {
 		ret_val = -ENOMEM;
@@ -108,7 +111,7 @@ static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
 
 	switch (entry->type) {
 	case NETLBL_NLTYPE_UNLABELED:
-		ret_val = netlbl_domhsh_add(entry, NETLINK_CB(skb).sid);
+		ret_val = netlbl_domhsh_add(entry, &audit_info);
 		break;
 	case NETLBL_NLTYPE_CIPSOV4:
 		if (!info->attrs[NLBL_MGMT_A_CV4DOI])
@@ -125,7 +128,7 @@ static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
 			rcu_read_unlock();
 			goto add_failure;
 		}
-		ret_val = netlbl_domhsh_add(entry, NETLINK_CB(skb).sid);
+		ret_val = netlbl_domhsh_add(entry, &audit_info);
 		rcu_read_unlock();
 		break;
 	default:
@@ -156,12 +159,15 @@ add_failure:
 static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
 {
 	char *domain;
+	struct netlbl_audit audit_info;
 
 	if (!info->attrs[NLBL_MGMT_A_DOMAIN])
 		return -EINVAL;
 
+	netlbl_netlink_auditinfo(skb, &audit_info);
+
 	domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
-	return netlbl_domhsh_remove(domain, NETLINK_CB(skb).sid);
+	return netlbl_domhsh_remove(domain, &audit_info);
 }
 
 /**
@@ -264,10 +270,13 @@ static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
 	int ret_val = -EINVAL;
 	struct netlbl_dom_map *entry = NULL;
 	u32 tmp_val;
+	struct netlbl_audit audit_info;
 
 	if (!info->attrs[NLBL_MGMT_A_PROTOCOL])
 		goto adddef_failure;
 
+	netlbl_netlink_auditinfo(skb, &audit_info);
+
 	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 	if (entry == NULL) {
 		ret_val = -ENOMEM;
@@ -277,8 +286,7 @@ static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
 
 	switch (entry->type) {
 	case NETLBL_NLTYPE_UNLABELED:
-		ret_val = netlbl_domhsh_add_default(entry,
-						    NETLINK_CB(skb).sid);
+		ret_val = netlbl_domhsh_add_default(entry, &audit_info);
 		break;
 	case NETLBL_NLTYPE_CIPSOV4:
 		if (!info->attrs[NLBL_MGMT_A_CV4DOI])
@@ -295,8 +303,7 @@ static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
 			rcu_read_unlock();
 			goto adddef_failure;
 		}
-		ret_val = netlbl_domhsh_add_default(entry,
-						    NETLINK_CB(skb).sid);
+		ret_val = netlbl_domhsh_add_default(entry, &audit_info);
 		rcu_read_unlock();
 		break;
 	default:
@@ -324,7 +331,11 @@ adddef_failure:
  */
 static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
 {
-	return netlbl_domhsh_remove_default(NETLINK_CB(skb).sid);
+	struct netlbl_audit audit_info;
+
+	netlbl_netlink_auditinfo(skb, &audit_info);
+
+	return netlbl_domhsh_remove_default(&audit_info);
 }
 
 /**
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index ab36675..1833ad2 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -70,18 +70,25 @@ static struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = {
 /**
  * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
  * @value: desired value
- * @audit_secid: the LSM secid to use in the audit message
+ * @audit_info: NetLabel audit information
  *
  * Description:
  * Set the value of the unlabeled accept flag to @value.
  *
  */
-static void netlbl_unlabel_acceptflg_set(u8 value, u32 audit_secid)
+static void netlbl_unlabel_acceptflg_set(u8 value,
+					 struct netlbl_audit *audit_info)
 {
+	struct audit_buffer *audit_buf;
+	u8 old_val;
+
+	old_val = atomic_read(&netlabel_unlabel_accept_flg);
 	atomic_set(&netlabel_unlabel_accept_flg, value);
-	netlbl_audit_nomsg((value ?
-			    AUDIT_MAC_UNLBL_ACCEPT : AUDIT_MAC_UNLBL_DENY),
-			   audit_secid);
+
+	audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
+					      audit_info);
+	audit_log_format(audit_buf, " unlbl_accept=%u old=%u", value, old_val);
+	audit_log_end(audit_buf);
 }
 
 /*
@@ -101,12 +108,13 @@ static void netlbl_unlabel_acceptflg_set(u8 value, u32 audit_secid)
 static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
 {
 	u8 value;
+	struct netlbl_audit audit_info;
 
 	if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) {
 		value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]);
 		if (value == 1 || value == 0) {
-			netlbl_unlabel_acceptflg_set(value,
-						     NETLINK_CB(skb).sid);
+			netlbl_netlink_auditinfo(skb, &audit_info);
+			netlbl_unlabel_acceptflg_set(value, &audit_info);
 			return 0;
 		}
 	}
@@ -250,19 +258,23 @@ int netlbl_unlabel_defconf(void)
 {
 	int ret_val;
 	struct netlbl_dom_map *entry;
-	u32 secid;
+	struct netlbl_audit audit_info;
 
-	security_task_getsecid(current, &secid);
+	/* Only the kernel is allowed to call this function and the only time
+	 * it is called is at bootup before the audit subsystem is reporting
+	 * messages so don't worry to much about these values. */
+	security_task_getsecid(current, &audit_info.secid);
+	audit_info.loginuid = 0;
 
 	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 	if (entry == NULL)
 		return -ENOMEM;
 	entry->type = NETLBL_NLTYPE_UNLABELED;
-	ret_val = netlbl_domhsh_add_default(entry, secid);
+	ret_val = netlbl_domhsh_add_default(entry, &audit_info);
 	if (ret_val != 0)
 		return ret_val;
 
-	netlbl_unlabel_acceptflg_set(1, secid);
+	netlbl_unlabel_acceptflg_set(1, &audit_info);
 
 	return 0;
 }
diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c
index c2343af..98a4163 100644
--- a/net/netlabel/netlabel_user.c
+++ b/net/netlabel/netlabel_user.c
@@ -85,7 +85,7 @@ int netlbl_netlink_init(void)
 /**
  * netlbl_audit_start_common - Start an audit message
  * @type: audit message type
- * @secid: LSM context ID
+ * @audit_info: NetLabel audit information
  *
  * Description:
  * Start an audit message using the type specified in @type and fill the audit
@@ -93,14 +93,11 @@ int netlbl_netlink_init(void)
  * a pointer to the audit buffer on success, NULL on failure.
  *
  */
-struct audit_buffer *netlbl_audit_start_common(int type, u32 secid)
+struct audit_buffer *netlbl_audit_start_common(int type,
+					       struct netlbl_audit *audit_info)
 {
 	struct audit_context *audit_ctx = current->audit_context;
 	struct audit_buffer *audit_buf;
-	uid_t audit_loginuid;
-	const char *audit_tty;
-	char audit_comm[sizeof(current->comm)];
-	struct vm_area_struct *vma;
 	char *secctx;
 	u32 secctx_len;
 
@@ -108,60 +105,13 @@ struct audit_buffer *netlbl_audit_start_common(int type, u32 secid)
 	if (audit_buf == NULL)
 		return NULL;
 
-	audit_loginuid = audit_get_loginuid(audit_ctx);
-	if (current->signal &&
-	    current->signal->tty &&
-	    current->signal->tty->name)
-		audit_tty = current->signal->tty->name;
-	else
-		audit_tty = "(none)";
-	get_task_comm(audit_comm, current);
+	audit_log_format(audit_buf, "netlabel: auid=%u", audit_info->loginuid);
 
-	audit_log_format(audit_buf,
-			 "netlabel: auid=%u uid=%u tty=%s pid=%d",
-			 audit_loginuid,
-			 current->uid,
-			 audit_tty,
-			 current->pid);
-	audit_log_format(audit_buf, " comm=");
-	audit_log_untrustedstring(audit_buf, audit_comm);
-	if (current->mm) {
-		down_read(&current->mm->mmap_sem);
-		vma = current->mm->mmap;
-		while (vma) {
-			if ((vma->vm_flags & VM_EXECUTABLE) &&
-			    vma->vm_file) {
-				audit_log_d_path(audit_buf,
-						 " exe=",
-						 vma->vm_file->f_dentry,
-						 vma->vm_file->f_vfsmnt);
-				break;
-			}
-			vma = vma->vm_next;
-		}
-		up_read(&current->mm->mmap_sem);
-	}
-
-	if (secid != 0 &&
-	    security_secid_to_secctx(secid, &secctx, &secctx_len) == 0)
+	if (audit_info->secid != 0 &&
+	    security_secid_to_secctx(audit_info->secid,
+				     &secctx,
+				     &secctx_len) == 0)
 		audit_log_format(audit_buf, " subj=%s", secctx);
 
 	return audit_buf;
 }
-
-/**
- * netlbl_audit_nomsg - Send an audit message without additional text
- * @type: audit message type
- * @secid: LSM context ID
- *
- * Description:
- * Send an audit message with only the common NetLabel audit fields.
- *
- */
-void netlbl_audit_nomsg(int type, u32 secid)
-{
-	struct audit_buffer *audit_buf;
-
-	audit_buf = netlbl_audit_start_common(type, secid);
-	audit_log_end(audit_buf);
-}
diff --git a/net/netlabel/netlabel_user.h b/net/netlabel/netlabel_user.h
index ab840ac..47967ef 100644
--- a/net/netlabel/netlabel_user.h
+++ b/net/netlabel/netlabel_user.h
@@ -72,13 +72,25 @@ static inline void *netlbl_netlink_hdr_put(struct sk_buff *skb,
 			   NETLBL_PROTO_VERSION);
 }
 
+/**
+ * netlbl_netlink_auditinfo - Fetch the audit information from a NETLINK msg
+ * @skb: the packet
+ * @audit_info: NetLabel audit information
+ */
+static inline void netlbl_netlink_auditinfo(struct sk_buff *skb,
+					    struct netlbl_audit *audit_info)
+{
+	audit_info->secid = NETLINK_CB(skb).sid;
+	audit_info->loginuid = NETLINK_CB(skb).loginuid;
+}
+
 /* NetLabel NETLINK I/O functions */
 
 int netlbl_netlink_init(void);
 
 /* NetLabel Audit Functions */
 
-struct audit_buffer *netlbl_audit_start_common(int type, u32 secid);
-void netlbl_audit_nomsg(int type, u32 secid);
+struct audit_buffer *netlbl_audit_start_common(int type,
+					      struct netlbl_audit *audit_info);
 
 #endif