r22020: Make it more clear that both the vuser struct and it's contents are

talloc_free()'ed at the end of a session.

Rework the passwd cache code to use talloc_unlink and
talloc_reference, to more carefully manage the cache.

Andrew Bartlett
(This used to be commit e3e0ec25e67308de314aa61852905ee42aa2c8fe)

1 files changed, 25 insertions, 39 deletions

diff --git a/source3/smbd/password.c b/source3/smbd/password.c
index bf4e9258ff..b7945bd7ea 100644
--- a/source3/smbd/password.c
+++ b/source3/smbd/password.c
@@ -92,14 +92,7 @@ void invalidate_vuid(uint16 vuid)
 	if (vuser == NULL)
 		return;
 	
-	SAFE_FREE(vuser->homedir);
-	SAFE_FREE(vuser->unix_homedir);
-	SAFE_FREE(vuser->logon_script);
-	
 	session_yield(vuser);
-	SAFE_FREE(vuser->session_keystr);
-
-	TALLOC_FREE(vuser->server_info);
 
 	data_blob_free(&vuser->session_key);
 
@@ -109,10 +102,7 @@ void invalidate_vuid(uint16 vuid)
 	   from the vuid 'owner' of connections */
 	conn_clear_vuid_cache(vuid);
 
-	SAFE_FREE(vuser->groups);
-	TALLOC_FREE(vuser->nt_user_token);
-
-	SAFE_FREE(vuser);
+	TALLOC_FREE(vuser);
 	num_validated_vuids--;
 }
 
@@ -153,7 +143,7 @@ int register_vuid(auth_serversupplied_info *server_info,
 		  DATA_BLOB session_key, DATA_BLOB response_blob,
 		  const char *smb_name)
 {
-	user_struct *vuser = NULL;
+	user_struct *vuser;
 
 	/* Paranoia check. */
 	if(lp_security() == SEC_SHARE) {
@@ -166,14 +156,12 @@ int register_vuid(auth_serversupplied_info *server_info,
 		return UID_FIELD_INVALID;
 	}
 
-	if((vuser = SMB_MALLOC_P(user_struct)) == NULL) {
-		DEBUG(0,("Failed to malloc users struct!\n"));
+	if((vuser = talloc_zero(NULL, user_struct)) == NULL) {
+		DEBUG(0,("Failed to talloc users struct!\n"));
 		data_blob_free(&session_key);
 		return UID_FIELD_INVALID;
 	}
 
-	ZERO_STRUCTP(vuser);
-
 	/* Allocate a free vuid. Yes this is a linear search... :-) */
 	while( get_valid_user_struct(next_vuid) != NULL ) {
 		next_vuid++;
@@ -203,6 +191,11 @@ int register_vuid(auth_serversupplied_info *server_info,
 		return vuser->vuid;
 	}
 
+	/* use this to keep tabs on all our info from the authentication */
+	vuser->server_info = server_info;
+	/* Ensure that the server_info will dissapear with the vuser it is now attached to */
+	talloc_steal(vuser, vuser->server_info);
+
 	/* the next functions should be done by a SID mapping system (SMS) as
 	 * the new real sam db won't have reference to unix uids or gids
 	 */
@@ -212,14 +205,13 @@ int register_vuid(auth_serversupplied_info *server_info,
 	
 	vuser->n_groups = server_info->n_groups;
 	if (vuser->n_groups) {
-		if (!(vuser->groups = (gid_t *)memdup(server_info->groups,
-						      sizeof(gid_t) *
-						      vuser->n_groups))) {
-			DEBUG(0,("register_vuid: failed to memdup "
+		if (!(vuser->groups = (gid_t *)talloc_memdup(vuser, server_info->groups,
+							     sizeof(gid_t) *
+							     vuser->n_groups))) {
+			DEBUG(0,("register_vuid: failed to talloc_memdup "
 				 "vuser->groups\n"));
 			data_blob_free(&session_key);
-			free(vuser);
-			TALLOC_FREE(server_info);
+			TALLOC_FREE(vuser);
 			return UID_FIELD_INVALID;
 		}
 	}
@@ -247,24 +239,26 @@ int register_vuid(auth_serversupplied_info *server_info,
 			const char *unix_homedir =
 				pdb_get_unix_homedir(server_info->sam_account);
 			if (unix_homedir) {
-				vuser->unix_homedir =
-					smb_xstrdup(unix_homedir);
+				vuser->unix_homedir = unix_homedir;
 			}
 		} else {
 			struct passwd *passwd =
-				getpwnam_alloc(NULL, vuser->user.unix_name);
+				getpwnam_alloc(vuser, vuser->user.unix_name);
 			if (passwd) {
-				vuser->unix_homedir =
-					smb_xstrdup(passwd->pw_dir);
+				vuser->unix_homedir = passwd->pw_dir;
+				/* Ensure that the unix_homedir now
+				 * belongs to vuser, so it goes away
+				 * with it, not with passwd below: */
+				talloc_steal(vuser, vuser->unix_homedir);
 				TALLOC_FREE(passwd);
 			}
 		}
 		
 		if (homedir) {
-			vuser->homedir = smb_xstrdup(homedir);
+			vuser->homedir = homedir;
 		}
 		if (logon_script) {
-			vuser->logon_script = smb_xstrdup(logon_script);
+			vuser->logon_script = logon_script;
 		}
 	}
 
@@ -280,23 +274,15 @@ int register_vuid(auth_serversupplied_info *server_info,
 		  vuser->user.full_name));	
 
  	if (server_info->ptok) {
-		vuser->nt_user_token = dup_nt_token(NULL, server_info->ptok);
+		vuser->nt_user_token = dup_nt_token(vuser, server_info->ptok);
 	} else {
 		DEBUG(1, ("server_info does not contain a user_token - "
 			  "cannot continue\n"));
-		TALLOC_FREE(server_info);
+		TALLOC_FREE(vuser);
 		data_blob_free(&session_key);
-		SAFE_FREE(vuser->homedir);
-		SAFE_FREE(vuser->unix_homedir);
-		SAFE_FREE(vuser->logon_script);
-
-		SAFE_FREE(vuser);
 		return UID_FIELD_INVALID;
 	}
 
-	/* use this to keep tabs on all our info from the authentication */
-	vuser->server_info = server_info;
-
 	DEBUG(3,("UNIX uid %d is UNIX user %s, and will be vuid %u\n",
 		 (int)vuser->uid,vuser->user.unix_name, vuser->vuid));