CVE-2018-1139 libcli/auth: Add initial tests for ntlm_password_check()

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13360

Signed-off-by: Andrew Bartlett <abartlet@samba.org>

2 files changed, 426 insertions, 0 deletions

diff --git a/libcli/auth/tests/ntlm_check.c b/libcli/auth/tests/ntlm_check.c
new file mode 100644
index 00000000000..e87a0a276d4
--- /dev/null
+++ b/libcli/auth/tests/ntlm_check.c
@@ -0,0 +1,413 @@
+/*
+ * Unit tests for the ntlm_check password hash check library.
+ *
+ *  Copyright (C) Andrew Bartlett <abartlet@samba.org> 2018
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/*
+ * from cmocka.c:
+ * These headers or their equivalents should be included prior to
+ * including
+ * this header file.
+ *
+ * #include <stdarg.h>
+ * #include <stddef.h>
+ * #include <setjmp.h>
+ *
+ * This allows test applications to use custom definitions of C standard
+ * library functions and types.
+ *
+ */
+
+/*
+ * Note that the messaging routines (audit_message_send and get_event_server)
+ * are not tested by these unit tests.  Currently they are for integration
+ * test support, and as such are exercised by the integration tests.
+ */
+#include <stdarg.h>
+#include <stddef.h>
+#include <setjmp.h>
+#include <cmocka.h>
+
+#include "includes.h"
+#include "../lib/crypto/crypto.h"
+#include "librpc/gen_ndr/netlogon.h"
+#include "libcli/auth/libcli_auth.h"
+#include "auth/credentials/credentials.h"
+
+struct ntlm_state {
+	const char *username;
+	const char *domain;
+	DATA_BLOB challenge;
+	DATA_BLOB ntlm;
+	DATA_BLOB lm;
+	DATA_BLOB ntlm_key;
+	DATA_BLOB lm_key;
+	const struct samr_Password *nt_hash;
+};
+
+static int test_ntlm_setup_with_options(void **state,
+					int flags, bool upn)
+{
+	NTSTATUS status;
+	DATA_BLOB challenge = {
+		.data = discard_const_p(uint8_t, "I am a teapot"),
+		.length = 8
+	};
+	struct ntlm_state *ntlm_state = talloc(NULL, struct ntlm_state);
+	DATA_BLOB target_info = NTLMv2_generate_names_blob(ntlm_state,
+							   NULL,
+							   "serverdom");
+	struct cli_credentials *creds = cli_credentials_init(ntlm_state);
+	cli_credentials_set_username(creds,
+				     "testuser",
+				     CRED_SPECIFIED);
+	cli_credentials_set_domain(creds,
+				   "testdom",
+				   CRED_SPECIFIED);
+	cli_credentials_set_workstation(creds,
+					"testwksta",
+					CRED_SPECIFIED);
+	cli_credentials_set_password(creds,
+				     "testpass",
+				     CRED_SPECIFIED);
+
+	if (upn) {
+		cli_credentials_set_principal(creds,
+					      "testuser@samba.org",
+					      CRED_SPECIFIED);
+	}
+
+	cli_credentials_get_ntlm_username_domain(creds,
+						 ntlm_state,
+						 &ntlm_state->username,
+						 &ntlm_state->domain);
+
+	status = cli_credentials_get_ntlm_response(creds,
+						   ntlm_state,
+						   &flags,
+						   challenge,
+						   NULL,
+						   target_info,
+						   &ntlm_state->lm,
+						   &ntlm_state->ntlm,
+						   &ntlm_state->lm_key,
+						   &ntlm_state->ntlm_key);
+	ntlm_state->challenge = challenge;
+
+	ntlm_state->nt_hash = cli_credentials_get_nt_hash(creds,
+							  ntlm_state);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		return -1;
+	}
+
+	*state = ntlm_state;
+	return 0;
+}
+
+static int test_ntlm_setup(void **state) {
+	return test_ntlm_setup_with_options(state, 0, false);
+}
+
+static int test_ntlm_and_lm_setup(void **state) {
+	return test_ntlm_setup_with_options(state,
+					    CLI_CRED_LANMAN_AUTH,
+					    false);
+}
+
+static int test_ntlm2_setup(void **state) {
+	return test_ntlm_setup_with_options(state,
+					    CLI_CRED_NTLM2,
+					    false);
+}
+
+static int test_ntlmv2_setup(void **state) {
+	return test_ntlm_setup_with_options(state,
+					    CLI_CRED_NTLMv2_AUTH,
+					    false);
+}
+
+static int test_ntlm_teardown(void **state)
+{
+	struct ntlm_state *ntlm_state
+		= talloc_get_type_abort(*state,
+					struct ntlm_state);
+	TALLOC_FREE(ntlm_state);
+	*state = NULL;
+	return 0;
+}
+
+static void test_ntlm_allowed(void **state)
+{
+	DATA_BLOB user_sess_key, lm_sess_key;
+	struct ntlm_state *ntlm_state
+		= talloc_get_type_abort(*state,
+					struct ntlm_state);
+	NTSTATUS status;
+	status = ntlm_password_check(ntlm_state,
+				     false,
+				     NTLM_AUTH_ON,
+				     0,
+				     &ntlm_state->challenge,
+				     &ntlm_state->lm,
+				     &ntlm_state->ntlm,
+				     ntlm_state->username,
+				     ntlm_state->username,
+				     ntlm_state->domain,
+				     NULL,
+				     ntlm_state->nt_hash,
+				     &user_sess_key,
+				     &lm_sess_key);
+
+	assert_int_equal(NT_STATUS_V(status), NT_STATUS_V(NT_STATUS_OK));
+}
+
+static void test_ntlm_allowed_lm_supplied(void **state)
+{
+	return test_ntlm_allowed(state);
+}
+
+static void test_ntlm_disabled(void **state)
+{
+	DATA_BLOB user_sess_key, lm_sess_key;
+	struct ntlm_state *ntlm_state
+		= talloc_get_type_abort(*state,
+					struct ntlm_state);
+	NTSTATUS status;
+	status = ntlm_password_check(ntlm_state,
+				     false,
+				     NTLM_AUTH_DISABLED,
+				     0,
+				     &ntlm_state->challenge,
+				     &ntlm_state->lm,
+				     &ntlm_state->ntlm,
+				     ntlm_state->username,
+				     ntlm_state->username,
+				     ntlm_state->domain,
+				     NULL,
+				     ntlm_state->nt_hash,
+				     &user_sess_key,
+				     &lm_sess_key);
+
+	assert_int_equal(NT_STATUS_V(status), NT_STATUS_V(NT_STATUS_NTLM_BLOCKED));
+}
+
+static void test_ntlm2(void **state)
+{
+	DATA_BLOB user_sess_key, lm_sess_key;
+	struct ntlm_state *ntlm_state
+		= talloc_get_type_abort(*state,
+					struct ntlm_state);
+	NTSTATUS status;
+	status = ntlm_password_check(ntlm_state,
+				     false,
+				     NTLM_AUTH_ON,
+				     0,
+				     &ntlm_state->challenge,
+				     &ntlm_state->lm,
+				     &ntlm_state->ntlm,
+				     ntlm_state->username,
+				     ntlm_state->username,
+				     ntlm_state->domain,
+				     NULL,
+				     ntlm_state->nt_hash,
+				     &user_sess_key,
+				     &lm_sess_key);
+
+	/*
+	 * NTLM2 session security (where the real challenge is the
+	 * MD5(challenge, client-challenge) (in the first 8 bytes of
+	 * the lm) isn't decoded by ntlm_password_check(), it must
+	 * first be converted back into normal NTLM by the NTLMSSP
+	 * layer
+	 */
+	assert_int_equal(NT_STATUS_V(status),
+			 NT_STATUS_V(NT_STATUS_WRONG_PASSWORD));
+}
+
+static void test_ntlm_mschapv2_only_allowed(void **state)
+{
+	DATA_BLOB user_sess_key, lm_sess_key;
+	struct ntlm_state *ntlm_state
+		= talloc_get_type_abort(*state,
+					struct ntlm_state);
+	NTSTATUS status;
+	status = ntlm_password_check(ntlm_state,
+				     false,
+				     NTLM_AUTH_MSCHAPv2_NTLMV2_ONLY,
+				     MSV1_0_ALLOW_MSVCHAPV2,
+				     &ntlm_state->challenge,
+				     &ntlm_state->lm,
+				     &ntlm_state->ntlm,
+				     ntlm_state->username,
+				     ntlm_state->username,
+				     ntlm_state->domain,
+				     NULL,
+				     ntlm_state->nt_hash,
+				     &user_sess_key,
+				     &lm_sess_key);
+
+	assert_int_equal(NT_STATUS_V(status), NT_STATUS_V(NT_STATUS_OK));
+}
+
+static void test_ntlm_mschapv2_only_denied(void **state)
+{
+	DATA_BLOB user_sess_key, lm_sess_key;
+	struct ntlm_state *ntlm_state
+		= talloc_get_type_abort(*state,
+					struct ntlm_state);
+	NTSTATUS status;
+	status = ntlm_password_check(ntlm_state,
+				     false,
+				     NTLM_AUTH_MSCHAPv2_NTLMV2_ONLY,
+				     0,
+				     &ntlm_state->challenge,
+				     &ntlm_state->lm,
+				     &ntlm_state->ntlm,
+				     ntlm_state->username,
+				     ntlm_state->username,
+				     ntlm_state->domain,
+				     NULL,
+				     ntlm_state->nt_hash,
+				     &user_sess_key,
+				     &lm_sess_key);
+
+	assert_int_equal(NT_STATUS_V(status),
+			 NT_STATUS_V(NT_STATUS_WRONG_PASSWORD));
+}
+
+static void test_ntlmv2_only_ntlmv2(void **state)
+{
+	DATA_BLOB user_sess_key, lm_sess_key;
+	struct ntlm_state *ntlm_state
+		= talloc_get_type_abort(*state,
+					struct ntlm_state);
+	NTSTATUS status;
+	status = ntlm_password_check(ntlm_state,
+				     false,
+				     NTLM_AUTH_NTLMV2_ONLY,
+				     0,
+				     &ntlm_state->challenge,
+				     &ntlm_state->lm,
+				     &ntlm_state->ntlm,
+				     ntlm_state->username,
+				     ntlm_state->username,
+				     ntlm_state->domain,
+				     NULL,
+				     ntlm_state->nt_hash,
+				     &user_sess_key,
+				     &lm_sess_key);
+
+	assert_int_equal(NT_STATUS_V(status), NT_STATUS_V(NT_STATUS_OK));
+}
+
+static void test_ntlmv2_only_ntlm(void **state)
+{
+	DATA_BLOB user_sess_key, lm_sess_key;
+	struct ntlm_state *ntlm_state
+		= talloc_get_type_abort(*state,
+					struct ntlm_state);
+	NTSTATUS status;
+	status = ntlm_password_check(ntlm_state,
+				     false,
+				     NTLM_AUTH_NTLMV2_ONLY,
+				     0,
+				     &ntlm_state->challenge,
+				     &ntlm_state->lm,
+				     &ntlm_state->ntlm,
+				     ntlm_state->username,
+				     ntlm_state->username,
+				     ntlm_state->domain,
+				     NULL,
+				     ntlm_state->nt_hash,
+				     &user_sess_key,
+				     &lm_sess_key);
+
+	assert_int_equal(NT_STATUS_V(status),
+			 NT_STATUS_V(NT_STATUS_WRONG_PASSWORD));
+}
+
+static void test_ntlmv2_only_ntlm_and_lanman(void **state)
+{
+	return test_ntlmv2_only_ntlm(state);
+}
+
+static void test_ntlmv2_only_ntlm_once(void **state)
+{
+	DATA_BLOB user_sess_key, lm_sess_key;
+	struct ntlm_state *ntlm_state
+		= talloc_get_type_abort(*state,
+					struct ntlm_state);
+	NTSTATUS status;
+	status = ntlm_password_check(ntlm_state,
+				     false,
+				     NTLM_AUTH_NTLMV2_ONLY,
+				     0,
+				     &ntlm_state->challenge,
+				     &data_blob_null,
+				     &ntlm_state->ntlm,
+				     ntlm_state->username,
+				     ntlm_state->username,
+				     ntlm_state->domain,
+				     NULL,
+				     ntlm_state->nt_hash,
+				     &user_sess_key,
+				     &lm_sess_key);
+
+	assert_int_equal(NT_STATUS_V(status),
+			 NT_STATUS_V(NT_STATUS_WRONG_PASSWORD));
+}
+
+int main(int argc, const char **argv)
+{
+	const struct CMUnitTest tests[] = {
+		cmocka_unit_test_setup_teardown(test_ntlm_allowed,
+						test_ntlm_setup,
+						test_ntlm_teardown),
+		cmocka_unit_test_setup_teardown(test_ntlm_allowed_lm_supplied,
+						test_ntlm_and_lm_setup,
+						test_ntlm_teardown),
+		cmocka_unit_test_setup_teardown(test_ntlm_disabled,
+						test_ntlm_setup,
+						test_ntlm_teardown),
+		cmocka_unit_test_setup_teardown(test_ntlm2,
+						test_ntlm2_setup,
+						test_ntlm_teardown),
+		cmocka_unit_test_setup_teardown(test_ntlm_mschapv2_only_allowed,
+						test_ntlm_setup,
+						test_ntlm_teardown),
+		cmocka_unit_test_setup_teardown(test_ntlm_mschapv2_only_denied,
+						test_ntlm_setup,
+						test_ntlm_teardown),
+		cmocka_unit_test_setup_teardown(test_ntlmv2_only_ntlm,
+						test_ntlm_setup,
+						test_ntlm_teardown),
+		cmocka_unit_test_setup_teardown(test_ntlmv2_only_ntlm_and_lanman,
+						test_ntlm_and_lm_setup,
+						test_ntlm_teardown),
+		cmocka_unit_test_setup_teardown(test_ntlmv2_only_ntlm_once,
+						test_ntlm_setup,
+						test_ntlm_teardown),
+		cmocka_unit_test_setup_teardown(test_ntlmv2_only_ntlmv2,
+						test_ntlmv2_setup,
+						test_ntlm_teardown)
+	};
+
+	cmocka_set_message_output(CM_OUTPUT_SUBUNIT);
+	return cmocka_run_group_tests(tests, NULL, NULL);
+}
diff --git a/libcli/auth/wscript_build b/libcli/auth/wscript_build
index 475b7d69406..d319d9b879e 100644
--- a/libcli/auth/wscript_build
+++ b/libcli/auth/wscript_build
@@ -41,3 +41,16 @@ bld.SAMBA_SUBSYSTEM('PAM_ERRORS',
 bld.SAMBA_SUBSYSTEM('SPNEGO_PARSE',
                     source='spnego_parse.c',
                     deps='asn1util')
+
+bld.SAMBA_BINARY(
+        'test_ntlm_check',
+        source='tests/ntlm_check.c',
+        deps='''
+             NTLM_CHECK
+             CREDENTIALS_NTLM
+             samba-credentials
+             cmocka
+             talloc
+        ''',
+        install=False
+    )