source/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
   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 "libcli/security/security.h"
  27 #include "libcli/auth/libcli_auth.h"
  28 #include "dsdb/samdb/samdb.h"
  29 #include "auth/credentials/credentials.h"
  30 #include "param/param.h"
  31
  32 struct auth_session_info *anonymous_session(TALLOC_CTX *mem_ctx,
  33                                             struct loadparm_context *lp_ctx)
  34 {
  35         NTSTATUS nt_status;
  36         struct auth_session_info *session_info = NULL;
  37         nt_status = auth_anonymous_session_info(mem_ctx, lp_ctx, &session_info);
  38         if (!NT_STATUS_IS_OK(nt_status)) {
  39                 return NULL;
  40         }
  41         return session_info;
  42 }
  43
  44 NTSTATUS auth_anonymous_session_info(TALLOC_CTX *parent_ctx,
  45                                      struct loadparm_context *lp_ctx,
  46                                      struct auth_session_info **_session_info)
  47 {
  48         NTSTATUS nt_status;
  49         struct auth_serversupplied_info *server_info = NULL;
  50         struct auth_session_info *session_info = NULL;
  51         TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
  52
  53         nt_status = auth_anonymous_server_info(mem_ctx,
  54                                                lp_netbios_name(lp_ctx),
  55                                                &server_info);
  56         if (!NT_STATUS_IS_OK(nt_status)) {
  57                 talloc_free(mem_ctx);
  58                 return nt_status;
  59         }
  60
  61         /* references the server_info into the session_info */
  62         nt_status = auth_generate_session_info(parent_ctx, server_info, &session_info);
  63         talloc_free(mem_ctx);
  64
  65         NT_STATUS_NOT_OK_RETURN(nt_status);
  66
  67         session_info->credentials = cli_credentials_init(session_info);
  68         if (!session_info->credentials) {
  69                 return NT_STATUS_NO_MEMORY;
  70         }
  71
  72         cli_credentials_set_conf(session_info->credentials, lp_ctx);
  73         cli_credentials_set_anonymous(session_info->credentials);
  74
  75         *_session_info = session_info;
  76
  77         return NT_STATUS_OK;
  78 }
  79
  80 NTSTATUS auth_anonymous_server_info(TALLOC_CTX *mem_ctx,
  81                                     const char *netbios_name,
  82                                     struct auth_serversupplied_info **_server_info)
  83 {
  84         struct auth_serversupplied_info *server_info;
  85         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
  86         NT_STATUS_HAVE_NO_MEMORY(server_info);
  87
  88         server_info->account_sid = dom_sid_parse_talloc(server_info, SID_NT_ANONYMOUS);
  89         NT_STATUS_HAVE_NO_MEMORY(server_info->account_sid);
  90
  91         /* is this correct? */
  92         server_info->primary_group_sid = dom_sid_parse_talloc(server_info, SID_BUILTIN_GUESTS);
  93         NT_STATUS_HAVE_NO_MEMORY(server_info->primary_group_sid);
  94
  95         server_info->n_domain_groups = 0;
  96         server_info->domain_groups = NULL;
  97
  98         /* annoying, but the Anonymous really does have a session key,
  99            and it is all zeros! */
 100         server_info->user_session_key = data_blob_talloc(server_info, NULL, 16);
 101         NT_STATUS_HAVE_NO_MEMORY(server_info->user_session_key.data);
 102
 103         server_info->lm_session_key = data_blob_talloc(server_info, NULL, 16);
 104         NT_STATUS_HAVE_NO_MEMORY(server_info->lm_session_key.data);
 105
 106         data_blob_clear(&server_info->user_session_key);
 107         data_blob_clear(&server_info->lm_session_key);
 108
 109         server_info->account_name = talloc_strdup(server_info, "ANONYMOUS LOGON");
 110         NT_STATUS_HAVE_NO_MEMORY(server_info->account_name);
 111
 112         server_info->domain_name = talloc_strdup(server_info, "NT AUTHORITY");
 113         NT_STATUS_HAVE_NO_MEMORY(server_info->domain_name);
 114
 115         server_info->full_name = talloc_strdup(server_info, "Anonymous Logon");
 116         NT_STATUS_HAVE_NO_MEMORY(server_info->full_name);
 117
 118         server_info->logon_script = talloc_strdup(server_info, "");
 119         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
 120
 121         server_info->profile_path = talloc_strdup(server_info, "");
 122         NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
 123
 124         server_info->home_directory = talloc_strdup(server_info, "");
 125         NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
 126
 127         server_info->home_drive = talloc_strdup(server_info, "");
 128         NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
 129
 130         server_info->logon_server = talloc_strdup(server_info, netbios_name);
 131         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_server);
 132
 133         server_info->last_logon = 0;
 134         server_info->last_logoff = 0;
 135         server_info->acct_expiry = 0;
 136         server_info->last_password_change = 0;
 137         server_info->allow_password_change = 0;
 138         server_info->force_password_change = 0;
 139
 140         server_info->logon_count = 0;
 141         server_info->bad_password_count = 0;
 142
 143         server_info->acct_flags = ACB_NORMAL;
 144
 145         server_info->authenticated = false;
 146
 147         *_server_info = server_info;
 148
 149         return NT_STATUS_OK;
 150 }
 151
 152 NTSTATUS auth_generate_session_info(TALLOC_CTX *mem_ctx,
 153                                     struct auth_serversupplied_info *server_info,
 154                                     struct auth_session_info **_session_info)
 155 {
 156         struct auth_session_info *session_info;
 157         NTSTATUS nt_status;
 158
 159         session_info = talloc(mem_ctx, struct auth_session_info);
 160         NT_STATUS_HAVE_NO_MEMORY(session_info);
 161
 162         session_info->server_info = talloc_reference(session_info, server_info);
 163
 164         /* unless set otherwise, the session key is the user session
 165          * key from the auth subsystem */
 166         session_info->session_key = server_info->user_session_key;
 167
 168         nt_status = security_token_create(session_info,
 169                                           global_loadparm,
 170                                           server_info->account_sid,
 171                                           server_info->primary_group_sid,
 172                                           server_info->n_domain_groups,
 173                                           server_info->domain_groups,
 174                                           server_info->authenticated,
 175                                           &session_info->security_token);
 176         NT_STATUS_NOT_OK_RETURN(nt_status);
 177
 178         session_info->credentials = NULL;
 179
 180         *_session_info = session_info;
 181         return NT_STATUS_OK;
 182 }
 183
 184 /**
 185  * prints a struct auth_session_info security token to debug output.
 186  */
 187 void auth_session_info_debug(int dbg_lev,
 188                              const struct auth_session_info *session_info)
 189 {
 190         if (!session_info) {
 191                 DEBUG(dbg_lev, ("Session Info: (NULL)\n"));
 192                 return;
 193         }
 194
 195         security_token_debug(dbg_lev, session_info->security_token);
 196 }
 197
 198 /**
 199  * Make a server_info struct from the info3 returned by a domain logon
 200  */
 201 NTSTATUS make_server_info_netlogon_validation(TALLOC_CTX *mem_ctx,
 202                                               const char *account_name,
 203                                               uint16_t validation_level,
 204                                               union netr_Validation *validation,
 205                                               struct auth_serversupplied_info **_server_info)
 206 {
 207         struct auth_serversupplied_info *server_info;
 208         struct netr_SamBaseInfo *base = NULL;
 209         int i;
 210
 211         switch (validation_level) {
 212         case 2:
 213                 if (!validation || !validation->sam2) {
 214                         return NT_STATUS_INVALID_PARAMETER;
 215                 }
 216                 base = &validation->sam2->base;
 217                 break;
 218         case 3:
 219                 if (!validation || !validation->sam3) {
 220                         return NT_STATUS_INVALID_PARAMETER;
 221                 }
 222                 base = &validation->sam3->base;
 223                 break;
 224         case 6:
 225                 if (!validation || !validation->sam6) {
 226                         return NT_STATUS_INVALID_PARAMETER;
 227                 }
 228                 base = &validation->sam6->base;
 229                 break;
 230         default:
 231                 return NT_STATUS_INVALID_LEVEL;
 232         }
 233
 234         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 235         NT_STATUS_HAVE_NO_MEMORY(server_info);
 236
 237         /*
 238            Here is where we should check the list of
 239            trusted domains, and verify that the SID
 240            matches.
 241         */
 242         server_info->account_sid = dom_sid_add_rid(server_info, base->domain_sid, base->rid);
 243         NT_STATUS_HAVE_NO_MEMORY(server_info->account_sid);
 244
 245
 246         server_info->primary_group_sid = dom_sid_add_rid(server_info, base->domain_sid, base->primary_gid);
 247         NT_STATUS_HAVE_NO_MEMORY(server_info->primary_group_sid);
 248
 249         server_info->n_domain_groups = base->groups.count;
 250         if (base->groups.count) {
 251                 server_info->domain_groups = talloc_array(server_info, struct dom_sid*, base->groups.count);
 252                 NT_STATUS_HAVE_NO_MEMORY(server_info->domain_groups);
 253         } else {
 254                 server_info->domain_groups = NULL;
 255         }
 256
 257         for (i = 0; i < base->groups.count; i++) {
 258                 server_info->domain_groups[i] = dom_sid_add_rid(server_info, base->domain_sid, base->groups.rids[i].rid);
 259                 NT_STATUS_HAVE_NO_MEMORY(server_info->domain_groups[i]);
 260         }
 261
 262         /* Copy 'other' sids.  We need to do sid filtering here to
 263            prevent possible elevation of privileges.  See:
 264
 265            http://www.microsoft.com/windows2000/techinfo/administration/security/sidfilter.asp
 266          */
 267
 268         if (validation_level == 3) {
 269                 struct dom_sid **dgrps = server_info->domain_groups;
 270                 size_t sidcount = server_info->n_domain_groups + validation->sam3->sidcount;
 271                 size_t n_dgrps = server_info->n_domain_groups;
 272
 273                 if (validation->sam3->sidcount > 0) {
 274                         dgrps = talloc_realloc(server_info, dgrps, struct dom_sid*, sidcount);
 275                         NT_STATUS_HAVE_NO_MEMORY(dgrps);
 276
 277                         for (i = 0; i < validation->sam3->sidcount; i++) {
 278                                 dgrps[n_dgrps + i] = talloc_reference(dgrps, validation->sam3->sids[i].sid);
 279                         }
 280                 }
 281
 282                 server_info->n_domain_groups = sidcount;
 283                 server_info->domain_groups = dgrps;
 284
 285                 /* Where are the 'global' sids?... */
 286         }
 287
 288         if (base->account_name.string) {
 289                 server_info->account_name = talloc_reference(server_info, base->account_name.string);
 290         } else {
 291                 server_info->account_name = talloc_strdup(server_info, account_name);
 292                 NT_STATUS_HAVE_NO_MEMORY(server_info->account_name);
 293         }
 294
 295         server_info->domain_name = talloc_reference(server_info, base->domain.string);
 296         server_info->full_name = talloc_reference(server_info, base->full_name.string);
 297         server_info->logon_script = talloc_reference(server_info, base->logon_script.string);
 298         server_info->profile_path = talloc_reference(server_info, base->profile_path.string);
 299         server_info->home_directory = talloc_reference(server_info, base->home_directory.string);
 300         server_info->home_drive = talloc_reference(server_info, base->home_drive.string);
 301         server_info->logon_server = talloc_reference(server_info, base->logon_server.string);
 302         server_info->last_logon = base->last_logon;
 303         server_info->last_logoff = base->last_logoff;
 304         server_info->acct_expiry = base->acct_expiry;
 305         server_info->last_password_change = base->last_password_change;
 306         server_info->allow_password_change = base->allow_password_change;
 307         server_info->force_password_change = base->force_password_change;
 308         server_info->logon_count = base->logon_count;
 309         server_info->bad_password_count = base->bad_password_count;
 310         server_info->acct_flags = base->acct_flags;
 311
 312         server_info->authenticated = true;
 313
 314         /* ensure we are never given NULL session keys */
 315
 316         if (all_zero(base->key.key, sizeof(base->key.key))) {
 317                 server_info->user_session_key = data_blob(NULL, 0);
 318         } else {
 319                 server_info->user_session_key = data_blob_talloc(server_info, base->key.key, sizeof(base->key.key));
 320                 NT_STATUS_HAVE_NO_MEMORY(server_info->user_session_key.data);
 321         }
 322
 323         if (all_zero(base->LMSessKey.key, sizeof(base->LMSessKey.key))) {
 324                 server_info->lm_session_key = data_blob(NULL, 0);
 325         } else {
 326                 server_info->lm_session_key = data_blob_talloc(server_info, base->LMSessKey.key, sizeof(base->LMSessKey.key));
 327                 NT_STATUS_HAVE_NO_MEMORY(server_info->lm_session_key.data);
 328         }
 329
 330         *_server_info = server_info;
 331         return NT_STATUS_OK;
 332 }
 333
 334