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
   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 #include "auth/session_proto.h"
  32
  33 _PUBLIC_ struct auth_session_info *anonymous_session(TALLOC_CTX *mem_ctx,
  34                                             struct event_context *event_ctx,
  35                                             struct loadparm_context *lp_ctx)
  36 {
  37         NTSTATUS nt_status;
  38         struct auth_session_info *session_info = NULL;
  39         nt_status = auth_anonymous_session_info(mem_ctx, event_ctx, lp_ctx, &session_info);
  40         if (!NT_STATUS_IS_OK(nt_status)) {
  41                 return NULL;
  42         }
  43         return session_info;
  44 }
  45
  46 _PUBLIC_ NTSTATUS auth_anonymous_session_info(TALLOC_CTX *parent_ctx,
  47                                      struct event_context *event_ctx,
  48                                      struct loadparm_context *lp_ctx,
  49                                      struct auth_session_info **_session_info)
  50 {
  51         NTSTATUS nt_status;
  52         struct auth_serversupplied_info *server_info = NULL;
  53         struct auth_session_info *session_info = NULL;
  54         TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
  55
  56         nt_status = auth_anonymous_server_info(mem_ctx,
  57                                                lp_netbios_name(lp_ctx),
  58                                                &server_info);
  59         if (!NT_STATUS_IS_OK(nt_status)) {
  60                 talloc_free(mem_ctx);
  61                 return nt_status;
  62         }
  63
  64         /* references the server_info into the session_info */
  65         nt_status = auth_generate_session_info(parent_ctx, event_ctx, lp_ctx, server_info, &session_info);
  66         talloc_free(mem_ctx);
  67
  68         NT_STATUS_NOT_OK_RETURN(nt_status);
  69
  70         session_info->credentials = cli_credentials_init(session_info);
  71         if (!session_info->credentials) {
  72                 return NT_STATUS_NO_MEMORY;
  73         }
  74
  75         cli_credentials_set_conf(session_info->credentials, lp_ctx);
  76         cli_credentials_set_anonymous(session_info->credentials);
  77
  78         *_session_info = session_info;
  79
  80         return NT_STATUS_OK;
  81 }
  82
  83 _PUBLIC_ NTSTATUS auth_anonymous_server_info(TALLOC_CTX *mem_ctx,
  84                                     const char *netbios_name,
  85                                     struct auth_serversupplied_info **_server_info)
  86 {
  87         struct auth_serversupplied_info *server_info;
  88         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
  89         NT_STATUS_HAVE_NO_MEMORY(server_info);
  90
  91         server_info->account_sid = dom_sid_parse_talloc(server_info, SID_NT_ANONYMOUS);
  92         NT_STATUS_HAVE_NO_MEMORY(server_info->account_sid);
  93
  94         /* is this correct? */
  95         server_info->primary_group_sid = dom_sid_parse_talloc(server_info, SID_BUILTIN_GUESTS);
  96         NT_STATUS_HAVE_NO_MEMORY(server_info->primary_group_sid);
  97
  98         server_info->n_domain_groups = 0;
  99         server_info->domain_groups = NULL;
 100
 101         /* annoying, but the Anonymous really does have a session key,
 102            and it is all zeros! */
 103         server_info->user_session_key = data_blob_talloc(server_info, NULL, 16);
 104         NT_STATUS_HAVE_NO_MEMORY(server_info->user_session_key.data);
 105
 106         server_info->lm_session_key = data_blob_talloc(server_info, NULL, 16);
 107         NT_STATUS_HAVE_NO_MEMORY(server_info->lm_session_key.data);
 108
 109         data_blob_clear(&server_info->user_session_key);
 110         data_blob_clear(&server_info->lm_session_key);
 111
 112         server_info->account_name = talloc_strdup(server_info, "ANONYMOUS LOGON");
 113         NT_STATUS_HAVE_NO_MEMORY(server_info->account_name);
 114
 115         server_info->domain_name = talloc_strdup(server_info, "NT AUTHORITY");
 116         NT_STATUS_HAVE_NO_MEMORY(server_info->domain_name);
 117
 118         server_info->full_name = talloc_strdup(server_info, "Anonymous Logon");
 119         NT_STATUS_HAVE_NO_MEMORY(server_info->full_name);
 120
 121         server_info->logon_script = talloc_strdup(server_info, "");
 122         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
 123
 124         server_info->profile_path = talloc_strdup(server_info, "");
 125         NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
 126
 127         server_info->home_directory = talloc_strdup(server_info, "");
 128         NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
 129
 130         server_info->home_drive = talloc_strdup(server_info, "");
 131         NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
 132
 133         server_info->logon_server = talloc_strdup(server_info, netbios_name);
 134         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_server);
 135
 136         server_info->last_logon = 0;
 137         server_info->last_logoff = 0;
 138         server_info->acct_expiry = 0;
 139         server_info->last_password_change = 0;
 140         server_info->allow_password_change = 0;
 141         server_info->force_password_change = 0;
 142
 143         server_info->logon_count = 0;
 144         server_info->bad_password_count = 0;
 145
 146         server_info->acct_flags = ACB_NORMAL;
 147
 148         server_info->authenticated = false;
 149
 150         *_server_info = server_info;
 151
 152         return NT_STATUS_OK;
 153 }
 154
 155 _PUBLIC_ NTSTATUS auth_generate_session_info(TALLOC_CTX *mem_ctx,
 156                                     struct event_context *event_ctx,
 157                                     struct loadparm_context *lp_ctx,
 158                                     struct auth_serversupplied_info *server_info,
 159                                     struct auth_session_info **_session_info)
 160 {
 161         struct auth_session_info *session_info;
 162         NTSTATUS nt_status;
 163
 164         session_info = talloc(mem_ctx, struct auth_session_info);
 165         NT_STATUS_HAVE_NO_MEMORY(session_info);
 166
 167         session_info->server_info = talloc_reference(session_info, server_info);
 168
 169         /* unless set otherwise, the session key is the user session
 170          * key from the auth subsystem */
 171         session_info->session_key = server_info->user_session_key;
 172
 173         nt_status = security_token_create(session_info,
 174                                           event_ctx,
 175                                           lp_ctx,
 176                                           server_info->account_sid,
 177                                           server_info->primary_group_sid,
 178                                           server_info->n_domain_groups,
 179                                           server_info->domain_groups,
 180                                           server_info->authenticated,
 181                                           &session_info->security_token);
 182         NT_STATUS_NOT_OK_RETURN(nt_status);
 183
 184         session_info->credentials = NULL;
 185
 186         *_session_info = session_info;
 187         return NT_STATUS_OK;
 188 }
 189
 190 /**
 191  * prints a struct auth_session_info security token to debug output.
 192  */
 193 void auth_session_info_debug(int dbg_lev,
 194                              const struct auth_session_info *session_info)
 195 {
 196         if (!session_info) {
 197                 DEBUG(dbg_lev, ("Session Info: (NULL)\n"));
 198                 return;
 199         }
 200
 201         security_token_debug(dbg_lev, session_info->security_token);
 202 }
 203
 204 /**
 205  * Make a server_info struct from the info3 returned by a domain logon
 206  */
 207 _PUBLIC_ NTSTATUS make_server_info_netlogon_validation(TALLOC_CTX *mem_ctx,
 208                                               const char *account_name,
 209                                               uint16_t validation_level,
 210                                               union netr_Validation *validation,
 211                                               struct auth_serversupplied_info **_server_info)
 212 {
 213         struct auth_serversupplied_info *server_info;
 214         struct netr_SamBaseInfo *base = NULL;
 215         int i;
 216
 217         switch (validation_level) {
 218         case 2:
 219                 if (!validation || !validation->sam2) {
 220                         return NT_STATUS_INVALID_PARAMETER;
 221                 }
 222                 base = &validation->sam2->base;
 223                 break;
 224         case 3:
 225                 if (!validation || !validation->sam3) {
 226                         return NT_STATUS_INVALID_PARAMETER;
 227                 }
 228                 base = &validation->sam3->base;
 229                 break;
 230         case 6:
 231                 if (!validation || !validation->sam6) {
 232                         return NT_STATUS_INVALID_PARAMETER;
 233                 }
 234                 base = &validation->sam6->base;
 235                 break;
 236         default:
 237                 return NT_STATUS_INVALID_LEVEL;
 238         }
 239
 240         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 241         NT_STATUS_HAVE_NO_MEMORY(server_info);
 242
 243         /*
 244            Here is where we should check the list of
 245            trusted domains, and verify that the SID
 246            matches.
 247         */
 248         server_info->account_sid = dom_sid_add_rid(server_info, base->domain_sid, base->rid);
 249         NT_STATUS_HAVE_NO_MEMORY(server_info->account_sid);
 250
 251
 252         server_info->primary_group_sid = dom_sid_add_rid(server_info, base->domain_sid, base->primary_gid);
 253         NT_STATUS_HAVE_NO_MEMORY(server_info->primary_group_sid);
 254
 255         server_info->n_domain_groups = base->groups.count;
 256         if (base->groups.count) {
 257                 server_info->domain_groups = talloc_array(server_info, struct dom_sid*, base->groups.count);
 258                 NT_STATUS_HAVE_NO_MEMORY(server_info->domain_groups);
 259         } else {
 260                 server_info->domain_groups = NULL;
 261         }
 262
 263         for (i = 0; i < base->groups.count; i++) {
 264                 server_info->domain_groups[i] = dom_sid_add_rid(server_info, base->domain_sid, base->groups.rids[i].rid);
 265                 NT_STATUS_HAVE_NO_MEMORY(server_info->domain_groups[i]);
 266         }
 267
 268         /* Copy 'other' sids.  We need to do sid filtering here to
 269            prevent possible elevation of privileges.  See:
 270
 271            http://www.microsoft.com/windows2000/techinfo/administration/security/sidfilter.asp
 272          */
 273
 274         if (validation_level == 3) {
 275                 struct dom_sid **dgrps = server_info->domain_groups;
 276                 size_t sidcount = server_info->n_domain_groups + validation->sam3->sidcount;
 277                 size_t n_dgrps = server_info->n_domain_groups;
 278
 279                 if (validation->sam3->sidcount > 0) {
 280                         dgrps = talloc_realloc(server_info, dgrps, struct dom_sid*, sidcount);
 281                         NT_STATUS_HAVE_NO_MEMORY(dgrps);
 282
 283                         for (i = 0; i < validation->sam3->sidcount; i++) {
 284                                 dgrps[n_dgrps + i] = talloc_reference(dgrps, validation->sam3->sids[i].sid);
 285                         }
 286                 }
 287
 288                 server_info->n_domain_groups = sidcount;
 289                 server_info->domain_groups = dgrps;
 290
 291                 /* Where are the 'global' sids?... */
 292         }
 293
 294         if (base->account_name.string) {
 295                 server_info->account_name = talloc_reference(server_info, base->account_name.string);
 296         } else {
 297                 server_info->account_name = talloc_strdup(server_info, account_name);
 298                 NT_STATUS_HAVE_NO_MEMORY(server_info->account_name);
 299         }
 300
 301         server_info->domain_name = talloc_reference(server_info, base->domain.string);
 302         server_info->full_name = talloc_reference(server_info, base->full_name.string);
 303         server_info->logon_script = talloc_reference(server_info, base->logon_script.string);
 304         server_info->profile_path = talloc_reference(server_info, base->profile_path.string);
 305         server_info->home_directory = talloc_reference(server_info, base->home_directory.string);
 306         server_info->home_drive = talloc_reference(server_info, base->home_drive.string);
 307         server_info->logon_server = talloc_reference(server_info, base->logon_server.string);
 308         server_info->last_logon = base->last_logon;
 309         server_info->last_logoff = base->last_logoff;
 310         server_info->acct_expiry = base->acct_expiry;
 311         server_info->last_password_change = base->last_password_change;
 312         server_info->allow_password_change = base->allow_password_change;
 313         server_info->force_password_change = base->force_password_change;
 314         server_info->logon_count = base->logon_count;
 315         server_info->bad_password_count = base->bad_password_count;
 316         server_info->acct_flags = base->acct_flags;
 317
 318         server_info->authenticated = true;
 319
 320         /* ensure we are never given NULL session keys */
 321
 322         if (all_zero(base->key.key, sizeof(base->key.key))) {
 323                 server_info->user_session_key = data_blob(NULL, 0);
 324         } else {
 325                 server_info->user_session_key = data_blob_talloc(server_info, base->key.key, sizeof(base->key.key));
 326                 NT_STATUS_HAVE_NO_MEMORY(server_info->user_session_key.data);
 327         }
 328
 329         if (all_zero(base->LMSessKey.key, sizeof(base->LMSessKey.key))) {
 330                 server_info->lm_session_key = data_blob(NULL, 0);
 331         } else {
 332                 server_info->lm_session_key = data_blob_talloc(server_info, base->LMSessKey.key, sizeof(base->LMSessKey.key));
 333                 NT_STATUS_HAVE_NO_MEMORY(server_info->lm_session_key.data);
 334         }
 335
 336         *_server_info = server_info;
 337         return NT_STATUS_OK;
 338 }
 339
 340