2 Unix SMB/Netbios implementation.
4 handle NLTMSSP, client server side parsing
6 Copyright (C) Andrew Tridgell 2001
7 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
8 Copyright (C) Stefan Metzmacher 2005
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "system/network.h"
26 #include "lib/tsocket/tsocket.h"
27 #include "auth/ntlmssp/ntlmssp.h"
28 #include "../librpc/gen_ndr/ndr_ntlmssp.h"
29 #include "auth/ntlmssp/ntlmssp_ndr.h"
30 #include "auth/ntlmssp/ntlmssp_private.h"
31 #include "../libcli/auth/libcli_auth.h"
32 #include "../lib/crypto/crypto.h"
33 #include "auth/gensec/gensec.h"
34 #include "auth/gensec/gensec_proto.h"
35 #include "auth/auth.h"
36 #include "param/param.h"
37 #include "source4/auth/ntlmssp/proto.h"
40 * Next state function for the Negotiate packet (GENSEC wrapper)
42 * @param gensec_security GENSEC state
43 * @param out_mem_ctx Memory context for *out
44 * @param in The request, as a DATA_BLOB. reply.data must be NULL
45 * @param out The reply, as an allocated DATA_BLOB, caller to free.
46 * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
49 NTSTATUS gensec_ntlmssp_server_negotiate(struct gensec_security *gensec_security,
50 TALLOC_CTX *out_mem_ctx,
51 const DATA_BLOB request, DATA_BLOB *reply)
53 struct gensec_ntlmssp_context *gensec_ntlmssp =
54 talloc_get_type_abort(gensec_security->private_data,
55 struct gensec_ntlmssp_context);
56 struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
57 return ntlmssp_server_negotiate(ntlmssp_state, out_mem_ctx, request, reply);
61 * Next state function for the Authenticate packet (GENSEC wrapper)
63 * @param gensec_security GENSEC state
64 * @param out_mem_ctx Memory context for *out
65 * @param in The request, as a DATA_BLOB. reply.data must be NULL
66 * @param out The reply, as an allocated DATA_BLOB, caller to free.
67 * @return Errors or NT_STATUS_OK if authentication sucessful
70 NTSTATUS gensec_ntlmssp_server_auth(struct gensec_security *gensec_security,
71 TALLOC_CTX *out_mem_ctx,
72 const DATA_BLOB in, DATA_BLOB *out)
74 struct gensec_ntlmssp_context *gensec_ntlmssp =
75 talloc_get_type_abort(gensec_security->private_data,
76 struct gensec_ntlmssp_context);
77 struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
78 return ntlmssp_server_auth(ntlmssp_state, out_mem_ctx, in, out);
82 * Return the challenge as determined by the authentication subsystem
83 * @return an 8 byte random challenge
86 static NTSTATUS auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state,
89 struct gensec_ntlmssp_context *gensec_ntlmssp =
90 talloc_get_type_abort(ntlmssp_state->callback_private,
91 struct gensec_ntlmssp_context);
92 struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
95 status = auth_context->get_challenge(auth_context, chal);
96 if (!NT_STATUS_IS_OK(status)) {
97 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
106 * Some authentication methods 'fix' the challenge, so we may not be able to set it
108 * @return If the effective challenge used by the auth subsystem may be modified
110 static bool auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
112 struct gensec_ntlmssp_context *gensec_ntlmssp =
113 talloc_get_type_abort(ntlmssp_state->callback_private,
114 struct gensec_ntlmssp_context);
115 struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
117 return auth_context->challenge_may_be_modified(auth_context);
121 * NTLM2 authentication modifies the effective challenge,
122 * @param challenge The new challenge value
124 static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
126 struct gensec_ntlmssp_context *gensec_ntlmssp =
127 talloc_get_type_abort(ntlmssp_state->callback_private,
128 struct gensec_ntlmssp_context);
129 struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
133 if (challenge->length != 8) {
134 return NT_STATUS_INVALID_PARAMETER;
137 chal = challenge->data;
139 nt_status = auth_context->set_challenge(auth_context,
141 "NTLMSSP callback (NTLM2)");
147 * Check the password on an NTLMSSP login.
149 * Return the session keys used on the connection.
152 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state,
154 DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
156 struct gensec_ntlmssp_context *gensec_ntlmssp =
157 talloc_get_type_abort(ntlmssp_state->callback_private,
158 struct gensec_ntlmssp_context);
159 struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
161 struct auth_usersupplied_info *user_info;
163 user_info = talloc_zero(ntlmssp_state, struct auth_usersupplied_info);
165 return NT_STATUS_NO_MEMORY;
168 user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
169 user_info->flags = 0;
170 user_info->mapped_state = false;
171 user_info->client.account_name = ntlmssp_state->user;
172 user_info->client.domain_name = ntlmssp_state->domain;
173 user_info->workstation_name = ntlmssp_state->client.netbios_name;
174 user_info->remote_host = gensec_get_remote_address(gensec_ntlmssp->gensec_security);
176 user_info->password_state = AUTH_PASSWORD_RESPONSE;
177 user_info->password.response.lanman = ntlmssp_state->lm_resp;
178 user_info->password.response.lanman.data = talloc_steal(user_info, ntlmssp_state->lm_resp.data);
179 user_info->password.response.nt = ntlmssp_state->nt_resp;
180 user_info->password.response.nt.data = talloc_steal(user_info, ntlmssp_state->nt_resp.data);
182 nt_status = auth_context->check_password(auth_context,
185 &gensec_ntlmssp->user_info_dc);
186 talloc_free(user_info);
187 NT_STATUS_NOT_OK_RETURN(nt_status);
189 if (gensec_ntlmssp->user_info_dc->user_session_key.length) {
190 DEBUG(10, ("Got NT session key of length %u\n",
191 (unsigned)gensec_ntlmssp->user_info_dc->user_session_key.length));
192 *user_session_key = gensec_ntlmssp->user_info_dc->user_session_key;
193 talloc_steal(mem_ctx, user_session_key->data);
194 gensec_ntlmssp->user_info_dc->user_session_key = data_blob_null;
196 if (gensec_ntlmssp->user_info_dc->lm_session_key.length) {
197 DEBUG(10, ("Got LM session key of length %u\n",
198 (unsigned)gensec_ntlmssp->user_info_dc->lm_session_key.length));
199 *lm_session_key = gensec_ntlmssp->user_info_dc->lm_session_key;
200 talloc_steal(mem_ctx, lm_session_key->data);
201 gensec_ntlmssp->user_info_dc->lm_session_key = data_blob_null;
207 * Return the credentials of a logged on user, including session keys
210 * Only valid after a successful authentication
212 * May only be called once per authentication.
216 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
218 struct auth_session_info **session_info)
221 struct gensec_ntlmssp_context *gensec_ntlmssp =
222 talloc_get_type_abort(gensec_security->private_data,
223 struct gensec_ntlmssp_context);
225 nt_status = gensec_generate_session_info(mem_ctx,
227 gensec_ntlmssp->user_info_dc,
229 NT_STATUS_NOT_OK_RETURN(nt_status);
231 return gensec_ntlmssp_session_key(gensec_security, *session_info,
232 &(*session_info)->session_key);
236 * Start NTLMSSP on the server side
239 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
242 struct ntlmssp_state *ntlmssp_state;
243 struct gensec_ntlmssp_context *gensec_ntlmssp;
245 nt_status = gensec_ntlmssp_start(gensec_security);
246 NT_STATUS_NOT_OK_RETURN(nt_status);
248 gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
249 struct gensec_ntlmssp_context);
250 ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
252 ntlmssp_state->role = NTLMSSP_SERVER;
254 ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
256 ntlmssp_state->allow_lm_key = (lpcfg_lanman_auth(gensec_security->settings->lp_ctx)
257 && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false));
259 ntlmssp_state->neg_flags =
260 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
262 ntlmssp_state->lm_resp = data_blob(NULL, 0);
263 ntlmssp_state->nt_resp = data_blob(NULL, 0);
265 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
266 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
269 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
270 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
273 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
274 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
277 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
278 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
281 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
282 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
285 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
286 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
288 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
289 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
292 ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
293 ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
294 ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
295 ntlmssp_state->check_password = auth_ntlmssp_check_password;
296 if (lpcfg_server_role(gensec_security->settings->lp_ctx) == ROLE_STANDALONE) {
297 ntlmssp_state->server.is_standalone = true;
299 ntlmssp_state->server.is_standalone = false;
302 ntlmssp_state->server.netbios_name = lpcfg_netbios_name(gensec_security->settings->lp_ctx);
304 ntlmssp_state->server.netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
307 const char *dnsdomain = lpcfg_dnsdomain(gensec_security->settings->lp_ctx);
308 char *dnsname, *lower_netbiosname;
309 lower_netbiosname = strlower_talloc(ntlmssp_state, ntlmssp_state->server.netbios_name);
311 /* Find out the DNS host name */
312 if (dnsdomain && dnsdomain[0] != '\0') {
313 dnsname = talloc_asprintf(ntlmssp_state, "%s.%s",
316 talloc_free(lower_netbiosname);
317 ntlmssp_state->server.dns_name = dnsname;
319 ntlmssp_state->server.dns_name = lower_netbiosname;
322 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_name);
324 ntlmssp_state->server.dns_domain
325 = talloc_strdup(ntlmssp_state,
326 lpcfg_dnsdomain(gensec_security->settings->lp_ctx));
327 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_domain);