winbindd: Add support for name aliasing.

* Add support user and group name aliasing by expanding
  the ws_name_replace() and ws_name_return() functions.
  The lookup path is
     aliases -> qualified name -> SID
     SID -> fully qualified name -> alias
  In other words, the name aliasing support is a thin layer
  built on top of SID/NAME translation.

* Rename the ws_name_XX() functions to normalize_name_map()
  and normalize_name_unmap().  Chaneg interface to return
  NTSTATUS rather than char *.

* Add associated cache validation functions.

6 files changed, 435 insertions, 22 deletions

diff --git a/source3/include/nss_info.h b/source3/include/nss_info.h
index 1ff9ebcd55..e756136b76 100644
--- a/source3/include/nss_info.h
+++ b/source3/include/nss_info.h
@@ -66,6 +66,10 @@ struct nss_info_methods {
 				  TALLOC_CTX *ctx, 
 				  ADS_STRUCT *ads, LDAPMessage *msg,
 				  char **homedir, char **shell, char **gecos, gid_t *p_gid);
+	NTSTATUS (*map_to_alias)( TALLOC_CTX *mem_ctx, const char *domain,
+				  const char *name, char **alias );
+	NTSTATUS (*map_from_alias)( TALLOC_CTX *mem_ctx, const char *domain,
+				    const char *alias, char **name );
 	NTSTATUS (*close_fn)( void );
 };
 
@@ -84,6 +88,12 @@ NTSTATUS nss_get_info( const char *domain, const DOM_SID *user_sid,
                        char **homedir, char **shell, char **gecos,
                        gid_t *p_gid);
 
+NTSTATUS nss_map_to_alias( TALLOC_CTX *mem_ctx, const char *domain,
+			   const char *name, char **alias );
+
+NTSTATUS nss_map_from_alias( TALLOC_CTX *mem_ctx, const char *domain,
+			     const char *alias, char **name );
+
 NTSTATUS nss_close( const char *parameters );
 
 #endif /* _IDMAP_NSS_H_ */
diff --git a/source3/winbindd/nss_info.c b/source3/winbindd/nss_info.c
index daa3dd037d..0e8cb60257 100644
--- a/source3/winbindd/nss_info.c
+++ b/source3/winbindd/nss_info.c
@@ -281,6 +281,47 @@ static struct nss_domain_entry *find_nss_domain( const char *domain )
 /********************************************************************
  *******************************************************************/
 
+ NTSTATUS nss_map_to_alias( TALLOC_CTX *mem_ctx, const char *domain,
+			    const char *name, char **alias )
+{
+	struct nss_domain_entry *p;
+	struct nss_info_methods *m;
+
+	if ( (p = find_nss_domain( domain )) == NULL ) {
+		DEBUG(4,("nss_map_to_alias: Failed to find nss domain pointer for %s\n",
+			 domain ));
+		return NT_STATUS_NOT_FOUND;
+	}
+
+	m = p->backend->methods;
+
+	return m->map_to_alias( mem_ctx, domain, name, alias );
+}
+
+
+/********************************************************************
+ *******************************************************************/
+
+ NTSTATUS nss_map_from_alias( TALLOC_CTX *mem_ctx, const char *domain,
+			      const char *alias, char **name )
+{
+	struct nss_domain_entry *p;
+	struct nss_info_methods *m;
+
+	if ( (p = find_nss_domain( domain )) == NULL ) {
+		DEBUG(4,("nss_map_from_alias: Failed to find nss domain pointer for %s\n",
+			 domain ));
+		return NT_STATUS_NOT_FOUND;
+	}
+
+	m = p->backend->methods;
+
+	return m->map_from_alias( mem_ctx, domain, alias, name );
+}
+
+/********************************************************************
+ *******************************************************************/
+
  NTSTATUS nss_close( const char *parameters )
 {
 	struct nss_domain_entry *p = nss_domain_list;
diff --git a/source3/winbindd/nss_info_template.c b/source3/winbindd/nss_info_template.c
index aaf02e4abe..d8f903ddd0 100644
--- a/source3/winbindd/nss_info_template.c
+++ b/source3/winbindd/nss_info_template.c
@@ -45,6 +45,8 @@ static NTSTATUS nss_template_get_info( struct nss_domain_entry *e,
 	if ( !homedir || !shell || !gecos )
 		return NT_STATUS_INVALID_PARAMETER;
 	
+	/* protect against home directories using whitespace in the
+	  username */
 	*homedir = talloc_strdup( ctx, lp_template_homedir() );
 	*shell   = talloc_strdup( ctx, lp_template_shell() );
 	*gecos   = NULL;
@@ -56,6 +58,28 @@ static NTSTATUS nss_template_get_info( struct nss_domain_entry *e,
 	return NT_STATUS_OK;
 }
 
+/**********************************************************************
+ *********************************************************************/
+
+static NTSTATUS nss_template_map_to_alias( TALLOC_CTX *mem_ctx,
+					   const char *domain,
+					   const char *name,
+					   char **alias )
+{
+	return NT_STATUS_NOT_IMPLEMENTED;
+}
+
+/**********************************************************************
+ *********************************************************************/
+
+static NTSTATUS nss_template_map_from_alias( TALLOC_CTX *mem_ctx,
+					     const char *domain,
+					     const char *alias,
+					     char **name )
+{
+	return NT_STATUS_NOT_IMPLEMENTED;
+}
+
 /************************************************************************
  ***********************************************************************/
 
@@ -69,9 +93,11 @@ static NTSTATUS nss_template_close( void )
  ***********************************************************************/
 
 static struct nss_info_methods nss_template_methods = {
-	.init         = nss_template_init,
-	.get_nss_info = nss_template_get_info,
-	.close_fn     = nss_template_close
+	.init           = nss_template_init,
+	.get_nss_info   = nss_template_get_info,
+	.map_to_alias   = nss_template_map_to_alias,
+	.map_from_alias = nss_template_map_from_alias,
+	.close_fn       = nss_template_close
 };
 		
 NTSTATUS nss_info_template_init( void )
diff --git a/source3/winbindd/winbindd_cache.c b/source3/winbindd/winbindd_cache.c
index 2fbb01b623..360e915bc4 100644
--- a/source3/winbindd/winbindd_cache.c
+++ b/source3/winbindd/winbindd_cache.c
@@ -934,6 +934,8 @@ static void wcache_save_lockout_policy(struct winbindd_domain *domain,
 	centry_free(centry);
 }
 
+
+
 static void wcache_save_password_policy(struct winbindd_domain *domain,
 					NTSTATUS status,
 					struct samr_DomInfo1 *policy)
@@ -957,6 +959,209 @@ static void wcache_save_password_policy(struct winbindd_domain *domain,
 	centry_free(centry);
 }
 
+/***************************************************************************
+ ***************************************************************************/
+
+static void wcache_save_username_alias(struct winbindd_domain *domain,
+				       NTSTATUS status,
+				       const char *name, const char *alias)
+{
+	struct cache_entry *centry;
+	fstring uname;
+
+	if ( (centry = centry_start(domain, status)) == NULL )
+		return;
+
+	centry_put_string( centry, alias );
+
+	fstrcpy(uname, name);
+	strupper_m(uname);
+	centry_end(centry, "NSS/NA/%s", uname);
+
+	DEBUG(10,("wcache_save_username_alias: %s -> %s\n", name, alias ));
+
+	centry_free(centry);
+}
+
+static void wcache_save_alias_username(struct winbindd_domain *domain,
+				       NTSTATUS status,
+				       const char *alias, const char *name)
+{
+	struct cache_entry *centry;
+	fstring uname;
+
+	if ( (centry = centry_start(domain, status)) == NULL )
+		return;
+
+	centry_put_string( centry, name );
+
+	fstrcpy(uname, alias);
+	strupper_m(uname);
+	centry_end(centry, "NSS/AN/%s", uname);
+
+	DEBUG(10,("wcache_save_alias_username: %s -> %s\n", alias, name ));
+
+	centry_free(centry);
+}
+
+/***************************************************************************
+ ***************************************************************************/
+
+NTSTATUS resolve_username_to_alias( TALLOC_CTX *mem_ctx,
+				    struct winbindd_domain *domain,
+				    const char *name, char **alias )
+{
+	struct winbind_cache *cache = get_cache(domain);
+	struct cache_entry *centry = NULL;
+	NTSTATUS status;
+	char *upper_name;
+
+	if ( domain->internal )
+		return NT_STATUS_NOT_SUPPORTED;
+
+	if (!cache->tdb)
+		goto do_query;
+
+	if ( (upper_name = SMB_STRDUP(name)) == NULL )
+		return NT_STATUS_NO_MEMORY;
+	strupper_m(upper_name);
+
+	centry = wcache_fetch(cache, domain, "NSS/NA/%s", upper_name);
+
+	SAFE_FREE( upper_name );
+
+	if (!centry)
+		goto do_query;
+
+	status = centry->status;
+
+	if (!NT_STATUS_IS_OK(status)) {
+		centry_free(centry);
+		return status;
+	}
+
+	*alias = centry_string( centry, mem_ctx );
+
+	centry_free(centry);
+
+	DEBUG(10,("resolve_username_to_alias: [Cached] - mapped %s to %s\n",
+		  name, *alias ? *alias : "(none)"));
+
+	return (*alias) ? NT_STATUS_OK : NT_STATUS_OBJECT_NAME_NOT_FOUND;
+
+do_query:
+
+	/* If its not in cache and we are offline, then fail */
+
+	if ( get_global_winbindd_state_offline() || !domain->online ) {
+		DEBUG(8,("resolve_username_to_alias: rejecting query "
+			 "in offline mode\n"));
+		return NT_STATUS_NOT_FOUND;
+	}
+
+	status = nss_map_to_alias( mem_ctx, domain->name, name, alias );
+
+	if ( NT_STATUS_IS_OK( status ) ) {
+		wcache_save_username_alias(domain, status, name, *alias);
+	}
+
+	if ( NT_STATUS_EQUAL( status, NT_STATUS_NONE_MAPPED ) ) {
+		wcache_save_username_alias(domain, status, name, "(NULL)");
+	}
+
+	DEBUG(5,("resolve_username_to_alias: backend query returned %s\n",
+		 nt_errstr(status)));
+
+	if ( NT_STATUS_EQUAL(status, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) ) {
+		set_domain_offline( domain );
+	}
+
+	return status;
+}
+
+/***************************************************************************
+ ***************************************************************************/
+
+NTSTATUS resolve_alias_to_username( TALLOC_CTX *mem_ctx,
+				    struct winbindd_domain *domain,
+				    const char *alias, char **name )
+{
+	struct winbind_cache *cache = get_cache(domain);
+	struct cache_entry *centry = NULL;
+	NTSTATUS status;
+	char *upper_name;
+
+	if ( domain->internal )
+		return  NT_STATUS_NOT_SUPPORTED;
+
+	if (!cache->tdb)
+		goto do_query;
+
+	if ( (upper_name = SMB_STRDUP(alias)) == NULL )
+		return NT_STATUS_NO_MEMORY;
+	strupper_m(upper_name);
+
+	centry = wcache_fetch(cache, domain, "NSS/AN/%s", upper_name);
+
+	SAFE_FREE( upper_name );
+
+	if (!centry)
+		goto do_query;
+
+	status = centry->status;
+
+	if (!NT_STATUS_IS_OK(status)) {
+		centry_free(centry);
+		return status;
+	}
+
+	*name = centry_string( centry, mem_ctx );
+
+	centry_free(centry);
+
+	DEBUG(10,("resolve_alias_to_username: [Cached] - mapped %s to %s\n",
+		  alias, *name ? *name : "(none)"));
+
+	return (*name) ? NT_STATUS_OK : NT_STATUS_OBJECT_NAME_NOT_FOUND;
+
+do_query:
+
+	/* If its not in cache and we are offline, then fail */
+
+	if ( get_global_winbindd_state_offline() || !domain->online ) {
+		DEBUG(8,("resolve_alias_to_username: rejecting query "
+			 "in offline mode\n"));
+		return NT_STATUS_NOT_FOUND;
+	}
+
+	/* an alias cannot contain a domain prefix or '@' */
+
+	if (strchr(alias, '\\') || strchr(alias, '@')) {
+		DEBUG(10,("resolve_alias_to_username: skipping fully "
+			  "qualified name %s\n", alias));
+		return NT_STATUS_OBJECT_NAME_INVALID;
+	}
+
+	status = nss_map_from_alias( mem_ctx, domain->name, alias, name );
+
+	if ( NT_STATUS_IS_OK( status ) ) {
+		wcache_save_alias_username( domain, status, alias, *name );
+	}
+
+	if (NT_STATUS_EQUAL(status, NT_STATUS_NONE_MAPPED)) {
+		wcache_save_alias_username(domain, status, alias, "(NULL)");
+	}
+
+	DEBUG(5,("resolve_alias_to_username: backend query returned %s\n",
+		 nt_errstr(status)));
+
+	if ( NT_STATUS_EQUAL(status, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) ) {
+		set_domain_offline( domain );
+	}
+
+	return status;
+}
+
 NTSTATUS wcache_cached_creds_exist(struct winbindd_domain *domain, const DOM_SID *sid)
 {
 	struct winbind_cache *cache = get_cache(domain);
@@ -3257,6 +3462,48 @@ static int validate_pwinfo(TALLOC_CTX *mem_ctx, const char *keystr,
 	return 0;
 }
 
+static int validate_nss_an(TALLOC_CTX *mem_ctx, const char *keystr,
+			   TDB_DATA dbuf,
+			   struct tdb_validation_status *state)
+{
+	struct cache_entry *centry = create_centry_validate(keystr, dbuf, state);
+
+	if (!centry) {
+		return 1;
+	}
+
+	(void)centry_string( centry, mem_ctx );
+
+	centry_free(centry);
+
+	if (!(state->success)) {
+		return 1;
+	}
+	DEBUG(10,("validate_pwinfo: %s ok\n", keystr));
+	return 0;
+}
+
+static int validate_nss_na(TALLOC_CTX *mem_ctx, const char *keystr,
+			   TDB_DATA dbuf,
+			   struct tdb_validation_status *state)
+{
+	struct cache_entry *centry = create_centry_validate(keystr, dbuf, state);
+
+	if (!centry) {
+		return 1;
+	}
+
+	(void)centry_string( centry, mem_ctx );
+
+	centry_free(centry);
+
+	if (!(state->success)) {
+		return 1;
+	}
+	DEBUG(10,("validate_pwinfo: %s ok\n", keystr));
+	return 0;
+}
+
 static int validate_trustdoms(TALLOC_CTX *mem_ctx, const char *keystr, TDB_DATA dbuf,
 			      struct tdb_validation_status *state)
 {
@@ -3358,6 +3605,8 @@ struct key_val_struct {
 	{"NSS/PWINFO/", validate_pwinfo},
 	{"TRUSTDOMS/", validate_trustdoms},
 	{"TRUSTDOMCACHE/", validate_trustdomcache},
+	{"NSS/NA/", validate_nss_na},
+	{"NSS/AN/", validate_nss_an},
 	{"WINBINDD_OFFLINE", validate_offline},
 	{WINBINDD_CACHE_VERSION_KEYSTR, validate_cache_version},
 	{NULL, NULL}
diff --git a/source3/winbindd/winbindd_proto.h b/source3/winbindd/winbindd_proto.h
index e0fc073a0a..4774bc8106 100644
--- a/source3/winbindd/winbindd_proto.h
+++ b/source3/winbindd/winbindd_proto.h
@@ -583,8 +583,22 @@ NTSTATUS lookup_usergroups_cached(struct winbindd_domain *domain,
 				  TALLOC_CTX *mem_ctx,
 				  const DOM_SID *user_sid,
 				  uint32 *p_num_groups, DOM_SID **user_sids);
-void ws_name_replace( char *name, char replace );
-void ws_name_return( char *name, char replace );
+
+NTSTATUS normalize_name_map(TALLOC_CTX *mem_ctx,
+			    struct winbindd_domain *domain,
+			    char *name,
+			    char **normalized);
+NTSTATUS normalize_name_unmap(TALLOC_CTX *mem_ctx,
+			      char *name,
+			      char **normalized);
+
+NTSTATUS resolve_username_to_alias(TALLOC_CTX *mem_ctx,
+				   struct winbindd_domain *domain,
+				   const char *name, char **alias);
+NTSTATUS resolve_alias_to_username(TALLOC_CTX *mem_ctx,
+				   struct winbindd_domain *domain,
+				   const char *alias, char **name);
+
 bool winbindd_can_contact_domain(struct winbindd_domain *domain);
 bool winbindd_internal_child(struct winbindd_child *child);
 void winbindd_set_locator_kdc_envs(const struct winbindd_domain *domain);
diff --git a/source3/winbindd/winbindd_util.c b/source3/winbindd/winbindd_util.c
index 132c96f1ee..e7b6576317 100644
--- a/source3/winbindd/winbindd_util.c
+++ b/source3/winbindd/winbindd_util.c
@@ -1378,34 +1378,107 @@ NTSTATUS lookup_usergroups_cached(struct winbindd_domain *domain,
  We use this to remove spaces from user and group names
 ********************************************************************/
 
-void ws_name_replace( char *name, char replace )
+NTSTATUS normalize_name_map(TALLOC_CTX *mem_ctx,
+			     struct winbindd_domain *domain,
+			     char *name,
+			     char **normalized)
 {
-	char replace_char[2] = { 0x0, 0x0 };
-    
-	if ( !lp_winbind_normalize_names() || (replace == '\0') ) 
-		return;
+	NTSTATUS nt_status;
 
-	replace_char[0] = replace;	
-	all_string_sub( name, " ", replace_char, 0 );
+	if (!name || !normalized) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
 
-	return;	
+	if (!lp_winbind_normalize_names()) {
+		return NT_STATUS_PROCEDURE_NOT_FOUND;
+	}
+
+	/* Alias support and whitespace replacement are mutually
+	   exclusive */
+
+	nt_status = resolve_username_to_alias(mem_ctx, domain,
+					      name, normalized );
+	if (NT_STATUS_IS_OK(nt_status)) {
+		/* special return code to let the caller know we
+		   mapped to an alias */
+		return NT_STATUS_FILE_RENAMED;
+	}
+
+	/* check for an unreachable domain */
+
+	if (NT_STATUS_EQUAL(nt_status, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND)) {
+		DEBUG(5,("normalize_name_map: Setting domain %s offline\n",
+			 domain->name));
+		set_domain_offline(domain);
+		return nt_status;
+	}
+
+	/* deal with whitespace */
+
+	*normalized = talloc_strdup(mem_ctx, name);
+	if (!(*normalized)) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	all_string_sub( *normalized, " ", "_", 0 );
+
+	return NT_STATUS_OK;
 }
 
 /*********************************************************************
- We use this to do the inverse of ws_name_replace()
+ We use this to do the inverse of normalize_name_map()
 ********************************************************************/
 
-void ws_name_return( char *name, char replace )
+NTSTATUS normalize_name_unmap(TALLOC_CTX *mem_ctx,
+			      char *name,
+			      char **normalized)
 {
-	char replace_char[2] = { 0x0, 0x0 };
-    
-	if ( !lp_winbind_normalize_names() || (replace == '\0') ) 
-		return;
+	NTSTATUS nt_status;
+	struct winbindd_domain *domain = find_our_domain();
+
+	if (!name || !normalized) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
 	
-	replace_char[0] = replace;	
-	all_string_sub( name, replace_char, " ", 0 );
+	if (!lp_winbind_normalize_names()) {
+		return NT_STATUS_PROCEDURE_NOT_FOUND;
+	}
 
-	return;	
+	/* Alias support and whitespace replacement are mutally
+	   exclusive */
+
+	/* When mapping from an alias to a username, we don't know the
+	   domain.  But we only need a domain structure to cache
+	   a successful lookup , so just our own domain structure for
+	   the seqnum. */
+
+	nt_status = resolve_alias_to_username(mem_ctx, domain,
+					      name, normalized);
+	if (NT_STATUS_IS_OK(nt_status)) {
+		/* Special return code to let the caller know we mapped
+		   from an alias */
+		return NT_STATUS_FILE_RENAMED;
+	}
+
+	/* check for an unreachable domain */
+
+	if (NT_STATUS_EQUAL(nt_status, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND)) {
+		DEBUG(5,("normalize_name_unmap: Setting domain %s offline\n",
+			 domain->name));
+		set_domain_offline(domain);
+		return nt_status;
+	}
+
+	/* deal with whitespace */
+
+	*normalized = talloc_strdup(mem_ctx, name);
+	if (!(*normalized)) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	all_string_sub(*normalized, "_", " ", 0);
+
+	return NT_STATUS_OK;
 }
 
 /*********************************************************************