[SCM] Samba Shared Repository - branch master updated

[Karolin Seeger]

The branch, master has been updated
       via  f76a429 CVE-2016-2019: s3:selftest: add regression tests for guest logins and mandatory signing
       via  53a1248 CVE-2016-2019: s3:libsmb: add comment regarding smbXcli_session_is_guest() with mandatory signing
       via  d81bffa CVE-2016-2019: libcli/smb: don't allow guest sessions if we require signing
      from  ef1a66d testprogs: Do not use the deprecated samba-tool user add

https://git.samba.org/?p=samba.git;a=shortlog;h=master


- Log -----------------------------------------------------------------
commit f76a4296cd6701c00a7e0fed05a6bbdce4f7bb7c
Author: Stefan Metzmacher <metze at samba.org>
Date:   Thu Apr 28 02:24:52 2016 +0200

    CVE-2016-2019: s3:selftest: add regression tests for guest logins and mandatory signing
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=11860
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    
    Autobuild-User(master): Karolin Seeger <kseeger at samba.org>
    Autobuild-Date(master): Thu Jul  7 14:52:20 CEST 2016 on sn-devel-144

commit 53a1248fb3a7d1406eb18730ca3ab4d238f891f4
Author: Stefan Metzmacher <metze at samba.org>
Date:   Thu Apr 28 02:36:35 2016 +0200

    CVE-2016-2019: s3:libsmb: add comment regarding smbXcli_session_is_guest() with mandatory signing
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=11860
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>

commit d81bffa0fbae56cc399c09b04e88a739dcad88cb
Author: Stefan Metzmacher <metze at samba.org>
Date:   Wed Apr 20 11:26:57 2016 +0200

    CVE-2016-2019: libcli/smb: don't allow guest sessions if we require signing
    
    Note real anonymous sessions (with "" as username) don't hit this
    as we don't even call smb2cli_session_set_session_key() in that case.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=11860
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>

-----------------------------------------------------------------------

Summary of changes:
 libcli/smb/smbXcli_base.c                   | 19 +++++++++++++++++--
 source3/libsmb/cliconnect.c                 |  3 +++
 source3/script/tests/test_smbclient_ntlm.sh |  4 ++++
 3 files changed, 24 insertions(+), 2 deletions(-)


Changeset truncated at 500 lines:

diff --git a/libcli/smb/smbXcli_base.c b/libcli/smb/smbXcli_base.c
index 135538b..0a2473e 100644
--- a/libcli/smb/smbXcli_base.c
+++ b/libcli/smb/smbXcli_base.c
@@ -5312,6 +5312,10 @@ bool smbXcli_session_is_guest(struct smbXcli_session *session)
 		return false;
 	}
 
+	if (session->conn->mandatory_signing) {
+		return false;
+	}
+
 	if (session->conn->protocol >= PROTOCOL_SMB2_02) {
 		if (session->smb2->session_flags & SMB2_SESSION_FLAG_IS_GUEST) {
 			return true;
@@ -5571,7 +5575,7 @@ NTSTATUS smb2cli_session_set_session_key(struct smbXcli_session *session,
 					 const struct iovec *recv_iov)
 {
 	struct smbXcli_conn *conn = session->conn;
-	uint16_t no_sign_flags;
+	uint16_t no_sign_flags = 0;
 	uint8_t session_key[16];
 	bool check_signature = true;
 	uint32_t hdr_flags;
@@ -5596,7 +5600,18 @@ NTSTATUS smb2cli_session_set_session_key(struct smbXcli_session *session,
 		return NT_STATUS_INVALID_PARAMETER_MIX;
 	}
 
-	no_sign_flags = SMB2_SESSION_FLAG_IS_GUEST | SMB2_SESSION_FLAG_IS_NULL;
+	if (!conn->mandatory_signing) {
+		/*
+		 * only allow guest sessions without
+		 * mandatory signing.
+		 *
+		 * If we try an authentication with username != ""
+		 * and the server let us in without verifying the
+		 * password we don't have a negotiated session key
+		 * for signing.
+		 */
+		no_sign_flags = SMB2_SESSION_FLAG_IS_GUEST;
+	}
 
 	if (session->smb2->session_flags & no_sign_flags) {
 		session->smb2->should_sign = false;
diff --git a/source3/libsmb/cliconnect.c b/source3/libsmb/cliconnect.c
index ea92c8f..ebba8f2 100644
--- a/source3/libsmb/cliconnect.c
+++ b/source3/libsmb/cliconnect.c
@@ -1588,6 +1588,9 @@ static void cli_session_setup_gensec_remote_done(struct tevent_req *subreq)
 			 * have a negotiated session key.
 			 *
 			 * So just pretend we are completely done.
+			 *
+			 * Note that smbXcli_session_is_guest()
+			 * always returns false if we require signing.
 			 */
 			state->blob_in = data_blob_null;
 			state->local_ready = true;
diff --git a/source3/script/tests/test_smbclient_ntlm.sh b/source3/script/tests/test_smbclient_ntlm.sh
index b8fc564..33a927f 100755
--- a/source3/script/tests/test_smbclient_ntlm.sh
+++ b/source3/script/tests/test_smbclient_ntlm.sh
@@ -37,4 +37,8 @@ else
 
 	testit "smbclient baduser.badpassword.NT1NEW.guest" $SMBCLIENT //$SERVER/IPC\$ $CONFIGURATION -Ubaduser%badpassword -mNT1 -c quit $ADDARGS
 	testit "smbclient baduser.badpassword.SMB3.guest" $SMBCLIENT //$SERVER/IPC\$ $CONFIGURATION -Ubaduser%badpassword -mSMB3 -c quit $ADDARGS
+
+	testit_expect_failure "smbclient baduser.badpassword.NT1OLD.signfail" $SMBCLIENT //$SERVER/IPC\$ $CONFIGURATION -Ubaduser%badpassword -mNT1 --option=clientusespnego=no --option=clientntlmv2auth=no --signing=required -c quit $ADDARGS
+	testit_expect_failure "smbclient baduser.badpassword.NT1NEW.signfail" $SMBCLIENT //$SERVER/IPC\$ $CONFIGURATION -Ubaduser%badpassword -mNT1 --signing=required -c quit $ADDARGS
+	testit_expect_failure "smbclient baduser.badpassword.SMB3.signfail" $SMBCLIENT //$SERVER/IPC\$ $CONFIGURATION -Ubaduser%badpassword -mSMB3 --signing=required -c quit $ADDARGS
 fi


-- 
Samba Shared Repository