+++ /dev/null
-/*
- 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 "source4/auth/ntlmssp/proto.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;
-}
-
git.samba.org / ira / wip.git / blobdiff