s3:auth_sam: map an empty domain or '.' to the local SAM name

When a domain member gets an empty domain name or '.', it should
not forward the authentication to domain controllers of
the primary domain.

But we need to keep passing UPN account names with
an empty domain to the DCs as a domain member.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14247

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
(cherry picked from commit 590df382bea44eec2dbfd2a28c659b0a29188bca)

3 files changed, 41 insertions, 3 deletions

diff --git a/python/samba/tests/auth_log_winbind.py b/python/samba/tests/auth_log_winbind.py
index a390197fe7f..6ba8795ae1e 100644
--- a/python/samba/tests/auth_log_winbind.py
+++ b/python/samba/tests/auth_log_winbind.py
@@ -322,7 +322,7 @@ class AuthLogTestsWinbind(AuthLogTestBase, BlackboxTestCase):
         self.assertEquals("unix:", msg["Authentication"]["localAddress"])
         self.assertEquals('', msg["Authentication"]["clientDomain"])
         # This is what the existing winbind implementation returns.
-        self.assertEquals("NT_STATUS_INVALID_HANDLE",
+        self.assertEquals("NT_STATUS_NO_SUCH_USER",
                           msg["Authentication"]["status"])
         self.assertEquals(self.credentials.get_username(),
                           msg["Authentication"]["clientAccount"])
@@ -425,7 +425,7 @@ class AuthLogTestsWinbind(AuthLogTestBase, BlackboxTestCase):
         self.assertEquals("unix:", msg["Authentication"]["localAddress"])
         self.assertEquals('', msg["Authentication"]["clientDomain"])
         # This is what the existing winbind implementation returns.
-        self.assertEquals("NT_STATUS_INVALID_HANDLE",
+        self.assertEquals("NT_STATUS_NO_SUCH_USER",
                           msg["Authentication"]["status"])
         self.assertEquals(self.credentials.get_username(),
                           msg["Authentication"]["clientAccount"])
diff --git a/selftest/knownfail.d/empty-domain-name b/selftest/knownfail.d/empty-domain-name
index 9855e4d58c2..a1ffcaf7e3c 100644
--- a/selftest/knownfail.d/empty-domain-name
+++ b/selftest/knownfail.d/empty-domain-name
@@ -1,5 +1,5 @@
 ^samba3.blackbox.smbclient_auth.empty_domain.domain_creds.smbclient.*as.user.*nt4_member
-^samba3.blackbox.smbclient_auth.empty_domain.member_creds.smbclient.*as.user.*ad_member
+^samba3.blackbox.smbclient_auth.empty_domain.domain_creds.smbclient.*as.user.*ad_member
 ^samba3.blackbox.smbclient_auth.dot_domain.domain_creds.smbclient.*as.user.*nt4_member
 ^samba3.blackbox.smbclient_auth.dot_domain.domain_creds.smbclient.*as.user.*ad_member
 ^samba3.blackbox.smbclient_auth.upn.domain_creds.smbclient.*as.*user.*nt4_member
diff --git a/source3/auth/auth_sam.c b/source3/auth/auth_sam.c
index 2948c18df0c..cdb8453b311 100644
--- a/source3/auth/auth_sam.c
+++ b/source3/auth/auth_sam.c
@@ -90,10 +90,36 @@ static NTSTATUS auth_samstrict_auth(const struct auth_context *auth_context,
 		return NT_STATUS_NOT_IMPLEMENTED;
 	}
 
+	if (lp_server_role() == ROLE_DOMAIN_MEMBER) {
+		const char *p = NULL;
+
+		p = strchr_m(user_info->mapped.account_name, '@');
+		if (p != NULL) {
+			/*
+			 * This needs to go to the DC,
+			 * even if @ is the last character
+			 */
+			return NT_STATUS_NOT_IMPLEMENTED;
+		}
+	}
+
+	if (effective_domain == NULL) {
+		effective_domain = "";
+	}
+
 	DBG_DEBUG("Check auth for: [%s]\\[%s]\n",
 		  effective_domain,
 		  user_info->mapped.account_name);
 
+
+	if (strequal(effective_domain, "") || strequal(effective_domain, ".")) {
+		/*
+		 * An empty domain name or '.' should be handled
+		 * as the local SAM name.
+		 */
+		effective_domain = lp_netbios_name();
+	}
+
 	is_local_name = is_myname(effective_domain);
 	is_my_domain  = strequal(effective_domain, lp_workgroup());
 
@@ -168,6 +194,10 @@ static NTSTATUS auth_sam_netlogon3_auth(const struct auth_context *auth_context,
 		return NT_STATUS_NOT_IMPLEMENTED;
 	}
 
+	if (effective_domain == NULL) {
+		effective_domain = "";
+	}
+
 	DBG_DEBUG("Check auth for: [%s]\\[%s]\n",
 		  effective_domain,
 		  user_info->mapped.account_name);
@@ -183,6 +213,14 @@ static NTSTATUS auth_sam_netlogon3_auth(const struct auth_context *auth_context,
 		return NT_STATUS_INVALID_SERVER_STATE;
 	}
 
+	if (strequal(effective_domain, "") || strequal(effective_domain, ".")) {
+		/*
+		 * An empty domain name or '.' should be handled
+		 * as the local SAM name.
+		 */
+		effective_domain = lp_workgroup();
+	}
+
 	is_my_domain = strequal(user_info->mapped.domain_name, lp_workgroup());
 	if (!is_my_domain) {
 		DBG_INFO("%s is not our domain name (DC for %s)\n",