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param: remove FN_LOCAL_STRING
[Samba.git] / source3 / auth / auth_generic.c
blob167d4e00367fb007d2fea15034d3b4477bc85b7c
1 /*
2 Unix SMB/Netbios implementation.
3 Version 3.0
4 handle GENSEC authentication, server side
5
6 Copyright (C) Andrew Tridgell 2001
7 Copyright (C) Andrew Bartlett 2001-2003,2011
8 Copyright (C) Simo Sorce 2010.
9
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.
14
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.
19
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/>.
22 */
23
24 #include "includes.h"
25 #include <tevent.h>
26 #include "../lib/util/tevent_ntstatus.h"
27 #include "auth.h"
28 #include "../lib/tsocket/tsocket.h"
29 #include "auth/gensec/gensec.h"
30 #include "lib/param/param.h"
31 #ifdef HAVE_KRB5
32 #include "auth/kerberos/pac_utils.h"
33 #include "nsswitch/libwbclient/wbclient.h"
34 #endif
35 #include "librpc/crypto/gse.h"
36 #include "auth/credentials/credentials.h"
37 #include "lib/param/loadparm.h"
38 #include "librpc/gen_ndr/dcerpc.h"
39
40 static NTSTATUS auth3_generate_session_info_pac(struct auth4_context *auth_ctx,
41 TALLOC_CTX *mem_ctx,
42 struct smb_krb5_context *smb_krb5_context,
43 DATA_BLOB *pac_blob,
44 const char *princ_name,
45 const struct tsocket_address *remote_address,
46 uint32_t session_info_flags,
47 struct auth_session_info **session_info)
48 {
49 TALLOC_CTX *tmp_ctx;
50 struct PAC_LOGON_INFO *logon_info = NULL;
51 struct netr_SamInfo3 *info3_copy = NULL;
52 bool is_mapped;
53 bool is_guest;
54 char *ntuser;
55 char *ntdomain;
56 char *username;
57 char *rhost;
58 struct passwd *pw;
59 NTSTATUS status;
60 int rc;
61
62 tmp_ctx = talloc_new(mem_ctx);
63 if (!tmp_ctx) {
64 return NT_STATUS_NO_MEMORY;
65 }
66
67 if (pac_blob) {
68 #ifdef HAVE_KRB5
69 struct wbcAuthUserParams params = {};
70 struct wbcAuthUserInfo *info = NULL;
71 struct wbcAuthErrorInfo *err = NULL;
72 wbcErr wbc_err;
73
74 /*
75 * Let winbind decode the PAC.
76 * This will also store the user
77 * data in the netsamlogon cache.
78 *
79 * We need to do this *before* we
80 * call get_user_from_kerberos_info()
81 * as that does a user lookup that
82 * expects info in the netsamlogon cache.
83 *
84 * See BUG: https://bugzilla.samba.org/show_bug.cgi?id=11259
85 */
86 params.level = WBC_AUTH_USER_LEVEL_PAC;
87 params.password.pac.data = pac_blob->data;
88 params.password.pac.length = pac_blob->length;
89
90 become_root();
91 wbc_err = wbcAuthenticateUserEx(&params, &info, &err);
92 unbecome_root();
93
94 /*
95 * As this is merely a cache prime
96 * WBC_ERR_WINBIND_NOT_AVAILABLE
97 * is not a fatal error, treat it
98 * as success.
99 */
100
101 switch (wbc_err) {
102 case WBC_ERR_WINBIND_NOT_AVAILABLE:
103 case WBC_ERR_SUCCESS:
104 break;
105 case WBC_ERR_AUTH_ERROR:
106 status = NT_STATUS(err->nt_status);
107 wbcFreeMemory(err);
108 goto done;
109 default:
110 status = NT_STATUS_LOGON_FAILURE;
111 goto done;
112 }
113
114 status = kerberos_pac_logon_info(tmp_ctx, *pac_blob, NULL, NULL,
115 NULL, NULL, 0, &logon_info);
116 #else
117 status = NT_STATUS_ACCESS_DENIED;
118 #endif
119 if (!NT_STATUS_IS_OK(status)) {
120 goto done;
121 }
122 }
123
124 rc = get_remote_hostname(remote_address,
125 &rhost,
126 tmp_ctx);
127 if (rc < 0) {
128 status = NT_STATUS_NO_MEMORY;
129 goto done;
130 }
131 if (strequal(rhost, "UNKNOWN")) {
132 rhost = tsocket_address_inet_addr_string(remote_address,
133 tmp_ctx);
134 if (rhost == NULL) {
135 status = NT_STATUS_NO_MEMORY;
136 goto done;
137 }
138 }
139
140 status = get_user_from_kerberos_info(tmp_ctx, rhost,
141 princ_name, logon_info,
142 &is_mapped, &is_guest,
143 &ntuser, &ntdomain,
144 &username, &pw);
145 if (!NT_STATUS_IS_OK(status)) {
146 DBG_NOTICE("Failed to map kerberos principal to system user "
147 "(%s)\n", nt_errstr(status));
148 status = NT_STATUS_ACCESS_DENIED;
149 goto done;
150 }
151
152 /* Get the info3 from the PAC data if we have it */
153 if (logon_info) {
154 status = create_info3_from_pac_logon_info(tmp_ctx,
155 logon_info,
156 &info3_copy);
157 if (!NT_STATUS_IS_OK(status)) {
158 goto done;
159 }
160 }
161
162 /* setup the string used by %U */
163 sub_set_smb_name(username);
164
165 /* reload services so that the new %U is taken into account */
166 lp_load_with_shares(get_dyn_CONFIGFILE());
167
168 status = make_session_info_krb5(mem_ctx,
169 ntuser, ntdomain, username, pw,
170 info3_copy, is_guest, is_mapped, NULL /* No session key for now, caller will sort it out */,
171 session_info);
172 if (!NT_STATUS_IS_OK(status)) {
173 DEBUG(1, ("Failed to map kerberos pac to server info (%s)\n",
174 nt_errstr(status)));
175 status = NT_STATUS_ACCESS_DENIED;
176 goto done;
177 }
178
179 DEBUG(5, (__location__ "OK: user: %s domain: %s client: %s\n",
180 ntuser, ntdomain, rhost));
181
182 status = NT_STATUS_OK;
183
184 done:
185 TALLOC_FREE(tmp_ctx);
186 return status;
187 }
188
189 static struct auth4_context *make_auth4_context_s3(TALLOC_CTX *mem_ctx, struct auth_context *auth_context)
190 {
191 struct auth4_context *auth4_context = talloc_zero(mem_ctx, struct auth4_context);
192 if (auth4_context == NULL) {
193 DEBUG(10, ("failed to allocate auth4_context failed\n"));
194 return NULL;
195 }
196 auth4_context->generate_session_info_pac = auth3_generate_session_info_pac;
197 auth4_context->generate_session_info = auth3_generate_session_info;
198 auth4_context->get_ntlm_challenge = auth3_get_challenge;
199 auth4_context->set_ntlm_challenge = auth3_set_challenge;
200 auth4_context->check_ntlm_password = auth3_check_password;
201 auth4_context->private_data = talloc_steal(auth4_context, auth_context);
202 return auth4_context;
203 }
204
205 NTSTATUS make_auth4_context(TALLOC_CTX *mem_ctx, struct auth4_context **auth4_context_out)
206 {
207 struct auth_context *auth_context;
208 NTSTATUS nt_status;
209
210 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
211 NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
212
213 nt_status = make_auth3_context_for_ntlm(tmp_ctx, &auth_context);
214 if (!NT_STATUS_IS_OK(nt_status)) {
215 TALLOC_FREE(tmp_ctx);
216 return nt_status;
217 }
218
219 if (auth_context->make_auth4_context) {
220 nt_status = auth_context->make_auth4_context(auth_context, mem_ctx, auth4_context_out);
221 TALLOC_FREE(tmp_ctx);
222 return nt_status;
223
224 } else {
225 struct auth4_context *auth4_context = make_auth4_context_s3(tmp_ctx, auth_context);
226 if (auth4_context == NULL) {
227 TALLOC_FREE(tmp_ctx);
228 return NT_STATUS_NO_MEMORY;
229 }
230 *auth4_context_out = talloc_steal(mem_ctx, auth4_context);
231 TALLOC_FREE(tmp_ctx);
232 return NT_STATUS_OK;
233 }
234 }
235
236 NTSTATUS auth_generic_prepare(TALLOC_CTX *mem_ctx,
237 const struct tsocket_address *remote_address,
238 const struct tsocket_address *local_address,
239 const char *service_description,
240 struct gensec_security **gensec_security_out)
241 {
242 struct gensec_security *gensec_security;
243 struct auth_context *auth_context;
244 NTSTATUS nt_status;
245
246 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
247 NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
248
249 nt_status = make_auth3_context_for_ntlm(tmp_ctx, &auth_context);
250 if (!NT_STATUS_IS_OK(nt_status)) {
251 TALLOC_FREE(tmp_ctx);
252 return nt_status;
253 }
254
255 if (auth_context->prepare_gensec) {
256 nt_status = auth_context->prepare_gensec(auth_context, tmp_ctx,
257 &gensec_security);
258 if (!NT_STATUS_IS_OK(nt_status)) {
259 TALLOC_FREE(tmp_ctx);
260 return nt_status;
261 }
262 } else {
263 const struct gensec_security_ops **backends = NULL;
264 struct gensec_settings *gensec_settings;
265 struct loadparm_context *lp_ctx;
266 size_t idx = 0;
267 struct cli_credentials *server_credentials;
268 const char *dns_name;
269 const char *dns_domain;
270 struct auth4_context *auth4_context = make_auth4_context_s3(tmp_ctx, auth_context);
271 if (auth4_context == NULL) {
272 TALLOC_FREE(tmp_ctx);
273 return NT_STATUS_NO_MEMORY;
274 }
275
276 lp_ctx = loadparm_init_s3(tmp_ctx, loadparm_s3_helpers());
277 if (lp_ctx == NULL) {
278 DEBUG(10, ("loadparm_init_s3 failed\n"));
279 TALLOC_FREE(tmp_ctx);
280 return NT_STATUS_INVALID_SERVER_STATE;
281 }
282
283 gensec_settings = lpcfg_gensec_settings(tmp_ctx, lp_ctx);
284 if (lp_ctx == NULL) {
285 DEBUG(10, ("lpcfg_gensec_settings failed\n"));
286 TALLOC_FREE(tmp_ctx);
287 return NT_STATUS_NO_MEMORY;
288 }
289
290 /*
291 * This should be a 'netbios domain -> DNS domain'
292 * mapping, and can currently validly return NULL on
293 * poorly configured systems.
294 *
295 * This is used for the NTLMSSP server
296 *
297 */
298 dns_name = get_mydnsfullname();
299 if (dns_name == NULL) {
300 dns_name = "";
301 }
302
303 dns_domain = get_mydnsdomname(tmp_ctx);
304 if (dns_domain == NULL) {
305 dns_domain = "";
306 }
307
308 gensec_settings->server_dns_name = strlower_talloc(gensec_settings, dns_name);
309 if (gensec_settings->server_dns_name == NULL) {
310 TALLOC_FREE(tmp_ctx);
311 return NT_STATUS_NO_MEMORY;
312 }
313
314 gensec_settings->server_dns_domain = strlower_talloc(gensec_settings, dns_domain);
315 if (gensec_settings->server_dns_domain == NULL) {
316 TALLOC_FREE(tmp_ctx);
317 return NT_STATUS_NO_MEMORY;
318 }
319
320 backends = talloc_zero_array(gensec_settings,
321 const struct gensec_security_ops *, 6);
322 if (backends == NULL) {
323 TALLOC_FREE(tmp_ctx);
324 return NT_STATUS_NO_MEMORY;
325 }
326 gensec_settings->backends = backends;
327
328 gensec_init();
329
330 /* These need to be in priority order, krb5 before NTLMSSP */
331 #if defined(HAVE_KRB5)
332 backends[idx++] = &gensec_gse_krb5_security_ops;
333 #endif
334
335 backends[idx++] = gensec_security_by_oid(NULL, GENSEC_OID_NTLMSSP);
336
337 backends[idx++] = gensec_security_by_oid(NULL, GENSEC_OID_SPNEGO);
338
339 backends[idx++] = gensec_security_by_auth_type(NULL, DCERPC_AUTH_TYPE_SCHANNEL);
340
341 backends[idx++] = gensec_security_by_auth_type(NULL, DCERPC_AUTH_TYPE_NCALRPC_AS_SYSTEM);
342
343 /*
344 * This is anonymous for now, because we just use it
345 * to set the kerberos state at the moment
346 */
347 server_credentials = cli_credentials_init_anon(tmp_ctx);
348 if (!server_credentials) {
349 DEBUG(0, ("auth_generic_prepare: Failed to init server credentials\n"));
350 return NT_STATUS_NO_MEMORY;
351 }
352
353 cli_credentials_set_conf(server_credentials, lp_ctx);
354
355 if (lp_security() == SEC_ADS || USE_KERBEROS_KEYTAB) {
356 cli_credentials_set_kerberos_state(server_credentials, CRED_AUTO_USE_KERBEROS);
357 } else {
358 cli_credentials_set_kerberos_state(server_credentials, CRED_DONT_USE_KERBEROS);
359 }
360
361 nt_status = gensec_server_start(tmp_ctx, gensec_settings,
362 auth4_context, &gensec_security);
363
364 if (!NT_STATUS_IS_OK(nt_status)) {
365 TALLOC_FREE(tmp_ctx);
366 return nt_status;
367 }
368
369 gensec_set_credentials(gensec_security, server_credentials);
370
371 talloc_unlink(tmp_ctx, lp_ctx);
372 talloc_unlink(tmp_ctx, server_credentials);
373 talloc_unlink(tmp_ctx, gensec_settings);
374 talloc_unlink(tmp_ctx, auth4_context);
375 }
376
377 nt_status = gensec_set_remote_address(gensec_security,
378 remote_address);
379 if (!NT_STATUS_IS_OK(nt_status)) {
380 TALLOC_FREE(tmp_ctx);
381 return nt_status;
382 }
383
384 nt_status = gensec_set_local_address(gensec_security,
385 local_address);
386 if (!NT_STATUS_IS_OK(nt_status)) {
387 TALLOC_FREE(tmp_ctx);
388 return nt_status;
389 }
390
391 nt_status = gensec_set_target_service_description(gensec_security,
392 service_description);
393
394 if (!NT_STATUS_IS_OK(nt_status)) {
395 TALLOC_FREE(tmp_ctx);
396 return nt_status;
397 }
398
399 *gensec_security_out = talloc_steal(mem_ctx, gensec_security);
400 TALLOC_FREE(tmp_ctx);
401 return NT_STATUS_OK;
402 }
403
404 /*
405 * Check a username and password, and return the final session_info.
406 * We also log the authorization of the session here, just as
407 * gensec_session_info() does.
408 */
409 NTSTATUS auth_check_password_session_info(struct auth4_context *auth_context,
410 TALLOC_CTX *mem_ctx,
411 struct auth_usersupplied_info *user_info,
412 struct auth_session_info **session_info)
413 {
414 NTSTATUS nt_status;
415 void *server_info;
416 uint8_t authoritative = 0;
417
418 if (auth_context->check_ntlm_password_send != NULL) {
419 struct tevent_context *ev = NULL;
420 struct tevent_req *subreq = NULL;
421 bool ok;
422
423 ev = samba_tevent_context_init(talloc_tos());
424 if (ev == NULL) {
425 return NT_STATUS_NO_MEMORY;
426 }
427
428 subreq = auth_context->check_ntlm_password_send(ev, ev,
429 auth_context,
430 user_info);
431 if (subreq == NULL) {
432 TALLOC_FREE(ev);
433 return NT_STATUS_NO_MEMORY;
434 }
435 ok = tevent_req_poll_ntstatus(subreq, ev, &nt_status);
436 if (!ok) {
437 TALLOC_FREE(ev);
438 return nt_status;
439 }
440 nt_status = auth_context->check_ntlm_password_recv(subreq,
441 talloc_tos(),
442 &authoritative,
443 &server_info,
444 NULL, NULL);
445 TALLOC_FREE(ev);
446 if (!NT_STATUS_IS_OK(nt_status)) {
447 return nt_status;
448 }
449 } else {
450 nt_status = auth_context->check_ntlm_password(auth_context,
451 talloc_tos(),
452 user_info,
453 &authoritative,
454 &server_info,
455 NULL, NULL);
456 if (!NT_STATUS_IS_OK(nt_status)) {
457 return nt_status;
458 }
459 }
460
461 nt_status = auth_context->generate_session_info(auth_context,
462 mem_ctx,
463 server_info,
464 user_info->client.account_name,
465 AUTH_SESSION_INFO_UNIX_TOKEN |
466 AUTH_SESSION_INFO_DEFAULT_GROUPS |
467 AUTH_SESSION_INFO_NTLM,
468 session_info);
469 TALLOC_FREE(server_info);
470
471 if (!NT_STATUS_IS_OK(nt_status)) {
472 return nt_status;
473 }
474
475 /*
476 * This is rather redundant (the authentication has just been
477 * logged, with much the same details), but because we want to
478 * log all authorizations consistently (be they NLTM, NTLMSSP
479 * or krb5) we log this info again as an authorization.
480 */
481 log_successful_authz_event(auth_context->msg_ctx,
482 auth_context->lp_ctx,
483 user_info->remote_host,
484 user_info->local_host,
485 user_info->service_description,
486 user_info->auth_description,
487 AUTHZ_TRANSPORT_PROTECTION_SMB,
488 *session_info);
489
490 return nt_status;
491 }
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