s4-auth Move conversion of security_token to unix_token to auth
[amitay/samba.git] / source4 / auth / session.c
1 /* 
2    Unix SMB/CIFS implementation.
3    Authentication utility functions
4    Copyright (C) Andrew Tridgell 1992-1998
5    Copyright (C) Andrew Bartlett 2001-2010
6    Copyright (C) Jeremy Allison 2000-2001
7    Copyright (C) Rafal Szczesniak 2002
8    Copyright (C) Stefan Metzmacher 2005
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 "auth/auth.h"
26 #include "auth/auth_sam.h"
27 #include "auth/credentials/credentials.h"
28 #include "auth/credentials/credentials_krb5.h"
29 #include "libcli/security/security.h"
30 #include "libcli/auth/libcli_auth.h"
31 #include "dsdb/samdb/samdb.h"
32 #include "auth/session_proto.h"
33 #include "system/kerberos.h"
34 #include <gssapi/gssapi.h>
35 #include "libcli/wbclient/wbclient.h"
36
37 _PUBLIC_ struct auth_session_info *anonymous_session(TALLOC_CTX *mem_ctx, 
38                                             struct loadparm_context *lp_ctx)
39 {
40         NTSTATUS nt_status;
41         struct auth_session_info *session_info = NULL;
42         nt_status = auth_anonymous_session_info(mem_ctx, lp_ctx, &session_info);
43         if (!NT_STATUS_IS_OK(nt_status)) {
44                 return NULL;
45         }
46         return session_info;
47 }
48
49 _PUBLIC_ NTSTATUS auth_generate_session_info(TALLOC_CTX *mem_ctx,
50                                              struct loadparm_context *lp_ctx, /* Optional, if you don't want privilages */
51                                              struct ldb_context *sam_ctx, /* Optional, if you don't want local groups */
52                                              struct auth_user_info_dc *user_info_dc,
53                                              uint32_t session_info_flags,
54                                              struct auth_session_info **_session_info)
55 {
56         struct auth_session_info *session_info;
57         NTSTATUS nt_status;
58         unsigned int i, num_sids = 0;
59
60         const char *filter;
61
62         struct dom_sid *sids = NULL;
63         const struct dom_sid *anonymous_sid, *system_sid;
64
65         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
66         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
67
68         session_info = talloc_zero(tmp_ctx, struct auth_session_info);
69         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(session_info, tmp_ctx);
70
71         session_info->info = talloc_reference(session_info, user_info_dc->info);
72
73         session_info->torture = talloc_zero(session_info, struct auth_user_info_torture);
74         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(session_info->torture, tmp_ctx);
75         session_info->torture->num_dc_sids = user_info_dc->num_sids;
76         session_info->torture->dc_sids = talloc_reference(session_info, user_info_dc->sids);
77         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(session_info->torture->dc_sids, tmp_ctx);
78
79         /* unless set otherwise, the session key is the user session
80          * key from the auth subsystem */ 
81         session_info->session_key = data_blob_talloc(session_info, user_info_dc->user_session_key.data, user_info_dc->user_session_key.length);
82         if (!session_info->session_key.data && session_info->session_key.length) {
83                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(session_info->session_key.data, tmp_ctx);
84         }
85
86         anonymous_sid = dom_sid_parse_talloc(tmp_ctx, SID_NT_ANONYMOUS);
87         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(anonymous_sid, tmp_ctx);
88
89         system_sid = dom_sid_parse_talloc(tmp_ctx, SID_NT_SYSTEM);
90         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(system_sid, tmp_ctx);
91
92         sids = talloc_array(tmp_ctx, struct dom_sid, user_info_dc->num_sids);
93         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(sids, tmp_ctx);
94         if (!sids) {
95                 talloc_free(tmp_ctx);
96                 return NT_STATUS_NO_MEMORY;
97         }
98
99         num_sids = user_info_dc->num_sids;
100
101         for (i=0; i < user_info_dc->num_sids; i++) {
102                 sids[i] = user_info_dc->sids[i];
103         }
104
105         if (user_info_dc->num_sids > PRIMARY_USER_SID_INDEX && dom_sid_equal(anonymous_sid, &user_info_dc->sids[PRIMARY_USER_SID_INDEX])) {
106                 /* Don't expand nested groups of system, anonymous etc*/
107         } else if (user_info_dc->num_sids > PRIMARY_USER_SID_INDEX && dom_sid_equal(system_sid, &user_info_dc->sids[PRIMARY_USER_SID_INDEX])) {
108                 /* Don't expand nested groups of system, anonymous etc*/
109         } else if (sam_ctx) {
110                 filter = talloc_asprintf(tmp_ctx, "(&(objectClass=group)(groupType:1.2.840.113556.1.4.803:=%u))",
111                                          GROUP_TYPE_BUILTIN_LOCAL_GROUP);
112
113                 /* Search for each group in the token */
114                 for (i = 0; i < user_info_dc->num_sids; i++) {
115                         char *sid_string;
116                         const char *sid_dn;
117                         DATA_BLOB sid_blob;
118                         
119                         sid_string = dom_sid_string(tmp_ctx,
120                                                       &user_info_dc->sids[i]);
121                         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(sid_string, user_info_dc);
122                         
123                         sid_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", sid_string);
124                         talloc_free(sid_string);
125                         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(sid_dn, user_info_dc);
126                         sid_blob = data_blob_string_const(sid_dn);
127                         
128                         /* This function takes in memberOf values and expands
129                          * them, as long as they meet the filter - so only
130                          * builtin groups
131                          *
132                          * We already have the SID in the token, so set
133                          * 'only childs' flag to true */
134                         nt_status = dsdb_expand_nested_groups(sam_ctx, &sid_blob, true, filter,
135                                                               tmp_ctx, &sids, &num_sids);
136                         if (!NT_STATUS_IS_OK(nt_status)) {
137                                 talloc_free(tmp_ctx);
138                                 return nt_status;
139                         }
140                 }
141         }
142
143         nt_status = security_token_create(session_info,
144                                           lp_ctx,
145                                           num_sids,
146                                           sids,
147                                           session_info_flags,
148                                           &session_info->security_token);
149         NT_STATUS_NOT_OK_RETURN_AND_FREE(nt_status, tmp_ctx);
150
151         session_info->credentials = NULL;
152
153         talloc_steal(mem_ctx, session_info);
154         *_session_info = session_info;
155         talloc_free(tmp_ctx);
156         return NT_STATUS_OK;
157 }
158
159 /* Fill out the auth_session_info with a cli_credentials based on the
160  * auth_session_info we were forwarded over named pipe forwarding.
161  *
162  * NOTE: The stucture members of session_info_transport are stolen
163  * with talloc_move() into auth_session_info for long term use
164  */
165 struct auth_session_info *auth_session_info_from_transport(TALLOC_CTX *mem_ctx,
166                                                            struct auth_session_info_transport *session_info_transport,
167                                                            struct loadparm_context *lp_ctx,
168                                                            const char **reason)
169 {
170         struct auth_session_info *session_info;
171         session_info = talloc_steal(mem_ctx, session_info_transport->session_info);
172
173         if (session_info_transport->exported_gssapi_credentials.length) {
174                 struct cli_credentials *creds;
175                 OM_uint32 minor_status;
176                 gss_buffer_desc cred_token;
177                 gss_cred_id_t cred_handle;
178                 const char *error_string;
179                 int ret;
180
181                 DEBUG(10, ("Delegated credentials supplied by client\n"));
182
183                 cred_token.value = session_info_transport->exported_gssapi_credentials.data;
184                 cred_token.length = session_info_transport->exported_gssapi_credentials.length;
185
186                 ret = gss_import_cred(&minor_status,
187                                       &cred_token,
188                                       &cred_handle);
189                 if (ret != GSS_S_COMPLETE) {
190                         *reason = "Internal error in gss_import_cred()";
191                         return NULL;
192                 }
193
194                 creds = cli_credentials_init(session_info);
195                 if (!creds) {
196                         *reason = "Out of memory in cli_credentials_init()";
197                         return NULL;
198                 }
199                 session_info->credentials = creds;
200
201                 cli_credentials_set_conf(creds, lp_ctx);
202                 /* Just so we don't segfault trying to get at a username */
203                 cli_credentials_set_anonymous(creds);
204
205                 ret = cli_credentials_set_client_gss_creds(creds,
206                                                            lp_ctx,
207                                                            cred_handle,
208                                                            CRED_SPECIFIED,
209                                                            &error_string);
210                 if (ret) {
211                         *reason = talloc_asprintf(mem_ctx,
212                                                   "Failed to set pipe forwarded"
213                                                   "creds: %s\n", error_string);
214                         return NULL;
215                 }
216
217                 /* This credential handle isn't useful for password
218                  * authentication, so ensure nobody tries to do that */
219                 cli_credentials_set_kerberos_state(creds,
220                                                    CRED_MUST_USE_KERBEROS);
221
222         }
223
224         return session_info;
225 }
226
227
228 /* Create a auth_session_info_transport from an auth_session_info.
229  *
230  * NOTE: Members of the auth_session_info_transport structure are
231  * talloc_referenced() into this structure, and should not be changed.
232  */
233 NTSTATUS auth_session_info_transport_from_session(TALLOC_CTX *mem_ctx,
234                                                   struct auth_session_info *session_info,
235                                                   struct tevent_context *event_ctx,
236                                                   struct loadparm_context *lp_ctx,
237                                                   struct auth_session_info_transport **transport_out)
238 {
239
240         struct auth_session_info_transport *session_info_transport
241                 = talloc_zero(mem_ctx, struct auth_session_info_transport);
242         if (!session_info_transport) {
243                 return NT_STATUS_NO_MEMORY;
244         };
245         session_info_transport->session_info = talloc_reference(session_info_transport, session_info);
246         if (!session_info_transport->session_info) {
247                 return NT_STATUS_NO_MEMORY;
248         };
249
250         if (session_info->credentials) {
251                 struct gssapi_creds_container *gcc;
252                 OM_uint32 gret;
253                 OM_uint32 minor_status;
254                 gss_buffer_desc cred_token;
255                 const char *error_string;
256                 int ret;
257
258                 ret = cli_credentials_get_client_gss_creds(session_info->credentials,
259                                                            event_ctx,
260                                                            lp_ctx,
261                                                            &gcc, &error_string);
262                 if (ret != 0) {
263                         *transport_out = session_info_transport;
264                         return NT_STATUS_OK;
265                 }
266
267                 gret = gss_export_cred(&minor_status,
268                                        gcc->creds,
269                                        &cred_token);
270                 if (gret != GSS_S_COMPLETE) {
271                         return NT_STATUS_INTERNAL_ERROR;
272                 }
273
274                 if (cred_token.length) {
275                         session_info_transport->exported_gssapi_credentials
276                                 = data_blob_talloc(session_info_transport,
277                                                    cred_token.value,
278                                                    cred_token.length);
279                         gss_release_buffer(&minor_status, &cred_token);
280                         NT_STATUS_HAVE_NO_MEMORY(session_info_transport->exported_gssapi_credentials.data);
281                 }
282         }
283         *transport_out = session_info_transport;
284         return NT_STATUS_OK;
285 }
286
287
288 /* Produce a session_info for an arbitary DN or principal in the local
289  * DB, assuming the local DB holds all the groups
290  *
291  * Supply either a principal or a DN
292  */
293 NTSTATUS authsam_get_session_info_principal(TALLOC_CTX *mem_ctx,
294                                             struct loadparm_context *lp_ctx,
295                                             struct ldb_context *sam_ctx,
296                                             const char *principal,
297                                             struct ldb_dn *user_dn,
298                                             uint32_t session_info_flags,
299                                             struct auth_session_info **session_info)
300 {
301         NTSTATUS nt_status;
302         struct auth_user_info_dc *user_info_dc;
303         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
304         if (!tmp_ctx) {
305                 return NT_STATUS_NO_MEMORY;
306         }
307         nt_status = authsam_get_user_info_dc_principal(tmp_ctx, lp_ctx, sam_ctx,
308                                                       principal, user_dn,
309                                                       &user_info_dc);
310         if (!NT_STATUS_IS_OK(nt_status)) {
311                 talloc_free(tmp_ctx);
312                 return nt_status;
313         }
314
315         nt_status = auth_generate_session_info(tmp_ctx, lp_ctx, sam_ctx,
316                                                user_info_dc, session_info_flags,
317                                                session_info);
318
319         if (NT_STATUS_IS_OK(nt_status)) {
320                 talloc_steal(mem_ctx, *session_info);
321         }
322         talloc_free(tmp_ctx);
323         return nt_status;
324 }
325
326 /**
327  * prints a struct auth_session_info security token to debug output.
328  */
329 void auth_session_info_debug(int dbg_lev, 
330                              const struct auth_session_info *session_info)
331 {
332         if (!session_info) {
333                 DEBUG(dbg_lev, ("Session Info: (NULL)\n"));
334                 return; 
335         }
336
337         security_token_debug(0, dbg_lev, session_info->security_token);
338 }