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