auth: Move the rest of the source4 gensec_ntlmssp code to the top level

The ntlmssp_server code will be in common shortly, and aside from a
symbol name or two, moving the client code causes no harm and makes
less mess.  We will also get the client code in common very soon.

Andrew Bartlett

Signed-off-by: Stefan Metzmacher <metze@samba.org>

1 files changed, 436 insertions, 0 deletions

diff --git a/auth/ntlmssp/ntlmssp_client.c b/auth/ntlmssp/ntlmssp_client.c
new file mode 100644
index 0000000000..1a2e857a58
--- /dev/null
+++ b/auth/ntlmssp/ntlmssp_client.c
@@ -0,0 +1,436 @@
+/*
+   Unix SMB/Netbios implementation.
+   Version 3.0
+   handle NLTMSSP, client server side parsing
+
+   Copyright (C) Andrew Tridgell      2001
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
+   Copyright (C) Stefan Metzmacher 2005
+
+   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/>.
+*/
+
+struct auth_session_info;
+
+#include "includes.h"
+#include "auth/ntlmssp/ntlmssp.h"
+#include "../lib/crypto/crypto.h"
+#include "../libcli/auth/libcli_auth.h"
+#include "auth/credentials/credentials.h"
+#include "auth/gensec/gensec.h"
+#include "param/param.h"
+#include "auth/ntlmssp/ntlmssp_private.h"
+#include "../librpc/gen_ndr/ndr_ntlmssp.h"
+#include "../auth/ntlmssp/ntlmssp_ndr.h"
+
+/*********************************************************************
+ Client side NTLMSSP
+*********************************************************************/
+
+/**
+ * Next state function for the Initial packet
+ *
+ * @param ntlmssp_state NTLMSSP State
+ * @param out_mem_ctx The DATA_BLOB *out will be allocated on this context
+ * @param in A NULL data blob (input ignored)
+ * @param out The initial negotiate request to the server, as an talloc()ed DATA_BLOB, on out_mem_ctx
+ * @return Errors or NT_STATUS_OK.
+ */
+
+NTSTATUS ntlmssp_client_initial(struct gensec_security *gensec_security,
+				TALLOC_CTX *out_mem_ctx,
+				DATA_BLOB in, DATA_BLOB *out)
+{
+	struct gensec_ntlmssp_context *gensec_ntlmssp =
+		talloc_get_type_abort(gensec_security->private_data,
+				      struct gensec_ntlmssp_context);
+	struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
+	const char *domain = ntlmssp_state->client.netbios_domain;
+	const char *workstation = ntlmssp_state->client.netbios_name;
+	NTSTATUS status;
+
+	/* These don't really matter in the initial packet, so don't panic if they are not set */
+	if (!domain) {
+		domain = "";
+	}
+
+	if (!workstation) {
+		workstation = "";
+	}
+
+	if (ntlmssp_state->unicode) {
+		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
+	} else {
+		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
+	}
+
+	if (ntlmssp_state->use_ntlmv2) {
+		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
+	}
+
+	/* generate the ntlmssp negotiate packet */
+	status = msrpc_gen(out_mem_ctx,
+		  out, "CddAA",
+		  "NTLMSSP",
+		  NTLMSSP_NEGOTIATE,
+		  ntlmssp_state->neg_flags,
+		  domain,
+		  workstation);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0, ("ntlmssp_client_initial: failed to generate "
+			  "ntlmssp negotiate packet\n"));
+		return status;
+	}
+
+	if (DEBUGLEVEL >= 10) {
+		struct NEGOTIATE_MESSAGE *negotiate = talloc(
+			talloc_tos(), struct NEGOTIATE_MESSAGE);
+		if (negotiate != NULL) {
+			status = ntlmssp_pull_NEGOTIATE_MESSAGE(
+				out, negotiate, negotiate);
+			if (NT_STATUS_IS_OK(status)) {
+				NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
+						negotiate);
+			}
+			TALLOC_FREE(negotiate);
+		}
+	}
+
+	ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
+
+	return NT_STATUS_MORE_PROCESSING_REQUIRED;
+}
+
+/**
+ * Next state function for the Challenge Packet.  Generate an auth packet.
+ *
+ * @param gensec_security GENSEC state
+ * @param out_mem_ctx Memory context for *out
+ * @param in The server challnege, as a DATA_BLOB.  reply.data must be NULL
+ * @param out The next request (auth packet) to the server, as an allocated DATA_BLOB, on the out_mem_ctx context
+ * @return Errors or NT_STATUS_OK.
+ */
+
+NTSTATUS ntlmssp_client_challenge(struct gensec_security *gensec_security,
+				  TALLOC_CTX *out_mem_ctx,
+				  const DATA_BLOB in, DATA_BLOB *out)
+{
+	struct gensec_ntlmssp_context *gensec_ntlmssp =
+		talloc_get_type_abort(gensec_security->private_data,
+				      struct gensec_ntlmssp_context);
+	struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
+	uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
+	DATA_BLOB server_domain_blob;
+	DATA_BLOB challenge_blob;
+	DATA_BLOB target_info = data_blob(NULL, 0);
+	char *server_domain;
+	const char *chal_parse_string;
+	const char *auth_gen_string;
+	DATA_BLOB lm_response = data_blob(NULL, 0);
+	DATA_BLOB nt_response = data_blob(NULL, 0);
+	DATA_BLOB session_key = data_blob(NULL, 0);
+	DATA_BLOB lm_session_key = data_blob(NULL, 0);
+	DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
+	NTSTATUS nt_status;
+	int flags = 0;
+	const char *user, *domain;
+
+	TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
+	if (!mem_ctx) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	if (!msrpc_parse(mem_ctx,
+			 &in, "CdBd",
+			 "NTLMSSP",
+			 &ntlmssp_command,
+			 &server_domain_blob,
+			 &chal_flags)) {
+		DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
+		dump_data(2, in.data, in.length);
+		talloc_free(mem_ctx);
+
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	data_blob_free(&server_domain_blob);
+
+	DEBUG(3, ("Got challenge flags:\n"));
+	debug_ntlmssp_flags(chal_flags);
+
+	ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, ntlmssp_state->allow_lm_key);
+
+	if (ntlmssp_state->unicode) {
+		if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
+			chal_parse_string = "CdUdbddB";
+		} else {
+			chal_parse_string = "CdUdbdd";
+		}
+		auth_gen_string = "CdBBUUUBd";
+	} else {
+		if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
+			chal_parse_string = "CdAdbddB";
+		} else {
+			chal_parse_string = "CdAdbdd";
+		}
+
+		auth_gen_string = "CdBBAAABd";
+	}
+
+	if (!msrpc_parse(mem_ctx,
+			 &in, chal_parse_string,
+			 "NTLMSSP",
+			 &ntlmssp_command,
+			 &server_domain,
+			 &chal_flags,
+			 &challenge_blob, 8,
+			 &unkn1, &unkn2,
+			 &target_info)) {
+		DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
+		dump_data(2, in.data, in.length);
+		talloc_free(mem_ctx);
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
+		ntlmssp_state->server.is_standalone = true;
+	} else {
+		ntlmssp_state->server.is_standalone = false;
+	}
+	/* TODO: parse struct_blob and fill in the rest */
+	ntlmssp_state->server.netbios_name = "";
+	ntlmssp_state->server.netbios_domain = server_domain;
+	ntlmssp_state->server.dns_name = "";
+	ntlmssp_state->server.dns_domain = "";
+
+	if (challenge_blob.length != 8) {
+		talloc_free(mem_ctx);
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	cli_credentials_get_ntlm_username_domain(gensec_security->credentials, mem_ctx,
+						 &user, &domain);
+
+	if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
+		flags |= CLI_CRED_NTLM2;
+	}
+	if (ntlmssp_state->use_ntlmv2) {
+		flags |= CLI_CRED_NTLMv2_AUTH;
+	}
+	if (ntlmssp_state->use_nt_response) {
+		flags |= CLI_CRED_NTLM_AUTH;
+	}
+	if (lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx)) {
+		flags |= CLI_CRED_LANMAN_AUTH;
+	}
+
+	nt_status = cli_credentials_get_ntlm_response(gensec_security->credentials, mem_ctx,
+						      &flags, challenge_blob, target_info,
+						      &lm_response, &nt_response,
+						      &lm_session_key, &session_key);
+
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		return nt_status;
+	}
+
+	if (!(flags & CLI_CRED_LANMAN_AUTH)) {
+		/* LM Key is still possible, just silly, so we do not
+		 * allow it. Fortunetly all LM crypto is off by
+		 * default and we require command line options to end
+		 * up here */
+		ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
+	}
+
+	if (!(flags & CLI_CRED_NTLM2)) {
+		/* NTLM2 is incompatible... */
+		ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
+	}
+
+	if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
+	    && lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx) && lm_session_key.length == 16) {
+		DATA_BLOB new_session_key = data_blob_talloc(mem_ctx, NULL, 16);
+		if (lm_response.length == 24) {
+			SMBsesskeygen_lm_sess_key(lm_session_key.data, lm_response.data,
+						  new_session_key.data);
+		} else {
+			static const uint8_t zeros[24];
+			SMBsesskeygen_lm_sess_key(lm_session_key.data, zeros,
+						  new_session_key.data);
+		}
+		session_key = new_session_key;
+		dump_data_pw("LM session key\n", session_key.data, session_key.length);
+	}
+
+
+	/* Key exchange encryptes a new client-generated session key with
+	   the password-derived key */
+	if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
+		/* Make up a new session key */
+		uint8_t client_session_key[16];
+		generate_secret_buffer(client_session_key, sizeof(client_session_key));
+
+		/* Encrypt the new session key with the old one */
+		encrypted_session_key = data_blob_talloc(ntlmssp_state,
+							 client_session_key, sizeof(client_session_key));
+		dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
+		arcfour_crypt(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
+		dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
+
+		/* Mark the new session key as the 'real' session key */
+		session_key = data_blob_talloc(mem_ctx, client_session_key, sizeof(client_session_key));
+	}
+
+	DEBUG(3, ("NTLMSSP: Set final flags:\n"));
+	debug_ntlmssp_flags(ntlmssp_state->neg_flags);
+
+	/* this generates the actual auth packet */
+	nt_status = msrpc_gen(mem_ctx,
+		       out, auth_gen_string,
+		       "NTLMSSP",
+		       NTLMSSP_AUTH,
+		       lm_response.data, lm_response.length,
+		       nt_response.data, nt_response.length,
+		       domain,
+		       user,
+		       cli_credentials_get_workstation(gensec_security->credentials),
+		       encrypted_session_key.data, encrypted_session_key.length,
+		       ntlmssp_state->neg_flags);
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		talloc_free(mem_ctx);
+		return nt_status;
+	}
+
+	ntlmssp_state->session_key = session_key;
+	talloc_steal(ntlmssp_state, session_key.data);
+
+	talloc_steal(out_mem_ctx, out->data);
+
+	ntlmssp_state->chal = challenge_blob;
+	ntlmssp_state->lm_resp = lm_response;
+	talloc_steal(ntlmssp_state->lm_resp.data, lm_response.data);
+	ntlmssp_state->nt_resp = nt_response;
+	talloc_steal(ntlmssp_state->nt_resp.data, nt_response.data);
+
+	ntlmssp_state->expected_state = NTLMSSP_DONE;
+
+	if (gensec_security->want_features & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL)) {
+		nt_status = ntlmssp_sign_init(ntlmssp_state);
+		if (!NT_STATUS_IS_OK(nt_status)) {
+			DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n",
+				  nt_errstr(nt_status)));
+			talloc_free(mem_ctx);
+			return nt_status;
+		}
+	}
+
+	talloc_free(mem_ctx);
+	return NT_STATUS_OK;
+}
+
+NTSTATUS gensec_ntlmssp_client_start(struct gensec_security *gensec_security)
+{
+	struct gensec_ntlmssp_context *gensec_ntlmssp;
+	struct ntlmssp_state *ntlmssp_state;
+	NTSTATUS nt_status;
+
+	nt_status = gensec_ntlmssp_start(gensec_security);
+	NT_STATUS_NOT_OK_RETURN(nt_status);
+
+	gensec_ntlmssp =
+		talloc_get_type_abort(gensec_security->private_data,
+				      struct gensec_ntlmssp_context);
+
+	ntlmssp_state = talloc_zero(gensec_ntlmssp,
+				    struct ntlmssp_state);
+	if (!ntlmssp_state) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	ntlmssp_state->callback_private = gensec_ntlmssp;
+
+	gensec_ntlmssp->ntlmssp_state = ntlmssp_state;
+
+	ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
+
+	ntlmssp_state->role = NTLMSSP_CLIENT;
+
+	ntlmssp_state->client.netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
+	ntlmssp_state->client.netbios_name = cli_credentials_get_workstation(gensec_security->credentials);
+
+	ntlmssp_state->unicode = gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "unicode", true);
+
+	ntlmssp_state->use_nt_response = gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "send_nt_reponse", true);
+
+	ntlmssp_state->allow_lm_key = (lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx)
+					      && (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "allow_lm_key", false)
+						  || gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "lm_key", false)));
+
+	ntlmssp_state->use_ntlmv2 = lpcfg_client_ntlmv2_auth(gensec_security->settings->lp_ctx);
+
+	ntlmssp_state->expected_state = NTLMSSP_INITIAL;
+
+	ntlmssp_state->neg_flags =
+		NTLMSSP_NEGOTIATE_NTLM |
+		NTLMSSP_REQUEST_TARGET;
+
+	if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "128bit", true)) {
+		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
+	}
+
+	if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "56bit", false)) {
+		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
+	}
+
+	if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "lm_key", false)) {
+		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
+	}
+
+	if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "keyexchange", true)) {
+		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
+	}
+
+	if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "alwayssign", true)) {
+		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
+	}
+
+	if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "ntlm2", true)) {
+		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
+	} else {
+		/* apparently we can't do ntlmv2 if we don't do ntlm2 */
+		ntlmssp_state->use_ntlmv2 = false;
+	}
+
+	if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
+		/*
+		 * We need to set this to allow a later SetPassword
+		 * via the SAMR pipe to succeed. Strange.... We could
+		 * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
+		 *
+		 * Without this, Windows will not create the master key
+		 * that it thinks is only used for NTLMSSP signing and
+		 * sealing.  (It is actually pulled out and used directly)
+		 */
+		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
+	}
+	if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
+		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
+	}
+	if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
+		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
+		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
+	}
+
+	return NT_STATUS_OK;
+}