added trusted realm support to ADS authentication

the method used for checking if a domain is a trusted domain is very
crude, we should really call a backend fn of some sort. For now I'm
using winbindd to do the dirty work.

source/auth/auth.c

@@ -29,19 +29,21 @@
 
 static BOOL check_domain_match(char *user, char *domain) 
 {
-  /*
-   * If we aren't serving to trusted domains, we must make sure that
-   * the validation request comes from an account in the same domain
-   * as the Samba server
-   */
+	/*
+	 * If we aren't serving to trusted domains, we must make sure that
+	 * the validation request comes from an account in the same domain
+	 * as the Samba server
+	 */
 
-  if (!lp_allow_trusted_domains() &&
-      !(strequal("", domain) || strequal(lp_workgroup(), domain) || is_netbios_alias_or_name(domain))) {
-      DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
-      return False;
-  } else {
-      return True;
-  }
+	if (!lp_allow_trusted_domains() &&
+	    !(strequal("", domain) || 
+	      strequal(lp_workgroup(), domain) || 
+	      is_netbios_alias_or_name(domain))) {
+		DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
+		return False;
+	} else {
+		return True;
+	}
 }
 
 /****************************************************************************

source/auth/auth_util.c

@@ -215,7 +215,26 @@ BOOL make_user_info_map(auth_usersupplied_info **user_info,
 	map_username(internal_username); 
 	
 	if (lp_allow_trusted_domains()) {
-		domain = client_domain;
+		char *user;
+		/* the client could have given us a workstation name
+		   or other crap for the workgroup - we really need a
+		   way of telling if this domain name is one of our
+		   trusted domain names 
+
+		   The way I do it here is by checking if the fully
+		   qualified username exists. This is rather reliant
+		   on winbind, but until we have a better method this
+		   will have to do 
+		*/
+		asprintf(&user, "%s%s%s", 
+			 client_domain, lp_winbind_separator(), 
+			 smb_name);
+		if (Get_Pwnam(user) != NULL) {
+			domain = client_domain;
+		} else {
+			domain = lp_workgroup();
+		}
+		free(user);
 	} else {
 		domain = lp_workgroup();
 	}

source/libsmb/clikrb5.c

@@ -60,8 +60,8 @@ static krb5_error_code krb5_mk_req2(krb5_context context,
 
 	if ((retval = krb5_get_credentials(context, 0,
 					   ccache, &creds, &credsp))) {
-		DEBUG(1,("krb5_get_credentials failed (%s)\n", 
-			 error_message(retval)));
+		DEBUG(1,("krb5_get_credentials failed for %s (%s)\n", 
+			 principal, error_message(retval)));
 		goto cleanup_creds;
 	}
 

source/nsswitch/winbindd.h

@@ -153,6 +153,7 @@ struct winbindd_methods {
 /* Structures to hold per domain information */
 struct winbindd_domain {
 	fstring name;                          /* Domain name */	
+	fstring full_name;                     /* full Domain name (realm) */	
 	DOM_SID sid;                           /* SID for this domain */
 	struct winbindd_methods *methods;      /* lookup methods for
                                                   this domain (LDAP or

source/nsswitch/winbindd_ads.c

@@ -147,6 +147,8 @@ static ADS_STRUCT *ads_cached_connection(struct winbindd_domain *domain)
 		primary_realm = strdup(ads->realm);
 	}
 
+	fstrcpy(domain->full_name, ads->server_realm);
+
 	domain->private = (void *)ads;
 	return ads;
 }

source/nsswitch/winbindd_util.c

@@ -55,7 +55,8 @@ struct winbindd_domain *find_domain_from_name(char *domain_name)
 	/* Search through list */
 
 	for (tmp = domain_list; tmp != NULL; tmp = tmp->next) {
-		if (strcasecmp(domain_name, tmp->name) == 0)
+		if (strcasecmp(domain_name, tmp->name) == 0 ||
+		    strcasecmp(domain_name, tmp->full_name) == 0)
 			return tmp;
 	}
 
@@ -164,6 +165,9 @@ BOOL get_domain_info(void)
 			DEBUG(1,("Added domain %s (%s)\n", 
 				 domain->name, 
 				 sid_string_static(&domain->sid)));
+
+			/* this primes the connection */
+			cache_methods.domain_sid(domain, &domain->sid);
 		}
 	}
 

source/smbd/sesssetup.c

@@ -107,14 +107,18 @@ static int reply_spnego_kerberos(connection_struct *conn,
 
 	*p = 0;
 	if (strcasecmp(p+1, ads->realm) != 0) {
-		DEBUG(3,("Ticket for incorrect realm %s\n", p+1));
-		ads_destroy(&ads);
-		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
+		DEBUG(3,("Ticket for foreign realm %s@%s\n", client, p+1));
+		if (!lp_allow_trusted_domains()) {
+			return ERROR_NT(NT_STATUS_LOGON_FAILURE);
+		}
+		/* this gives a fully qualified user name (ie. with full realm).
+		   that leads to very long usernames, but what else can we do? */
+		asprintf(&user, "%s%s%s", p+1, lp_winbind_separator(), client);
+	} else {
+		user = strdup(client);
 	}
 	ads_destroy(&ads);
 
-	user = client;
-
 	/* the password is good - let them in */
 	pw = smb_getpwnam(user,False);
 	if (!pw) {
@@ -129,6 +133,7 @@ static int reply_spnego_kerberos(connection_struct *conn,
 	
 	sess_vuid = register_vuid(server_info, user);
 
+	free(user);
 	free_server_info(&server_info);
 
 	if (sess_vuid == -1) {