source/sam/idmap_rid.c

   1 /*
   2  *  idmap_rid: static map between Active Directory/NT RIDs and RFC 2307 accounts
   3  *  Copyright (C) Guenther Deschner, 2004
   4  *  Copyright (C) Sumit Bose, 2004
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  */
  21
  22 #include "includes.h"
  23
  24 #undef DBGC_CLASS
  25 #define DBGC_CLASS DBGC_IDMAP
  26
  27 NTSTATUS init_module(void);
  28
  29 struct dom_entry {
  30         fstring name;
  31         fstring sid;
  32         uint32 min_id;
  33         uint32 max_id;
  34 };
  35
  36 typedef struct trust_dom_array {
  37         int number;
  38         struct dom_entry *dom;
  39 } trust_dom_array;
  40
  41 static trust_dom_array trust;
  42
  43 static NTSTATUS rid_idmap_parse(const char *init_param,
  44                                 uint32 num_domains,
  45                                 fstring *domain_names,
  46                                 DOM_SID *domain_sids,
  47                                 uid_t u_low,
  48                                 uid_t u_high)
  49 {
  50         const char *p;
  51         int i;
  52         fstring sid_str;
  53         BOOL known_domain = False;
  54         fstring tok;
  55
  56         p = init_param;
  57         trust.number = 0;
  58
  59         /* falling back to automatic mapping when there were no options given */
  60         if (!*init_param) {
  61
  62                 DEBUG(3,("rid_idmap_parse: no domain list given or trusted domain-support deactivated, falling back to automatic mapping for own domain:\n"));
  63
  64                 sid_to_string(sid_str, &domain_sids[0]);
  65
  66                 fstrcpy(trust.dom[0].name, domain_names[0]);
  67                 fstrcpy(trust.dom[0].sid, sid_str);
  68                 trust.dom[0].min_id = u_low;
  69                 trust.dom[0].max_id = u_high;
  70                 trust.number = 1;
  71
  72                 DEBUGADD(3,("rid_idmap_parse:\tdomain: [%s], sid: [%s], range=[%d-%d]\n",
  73                                 trust.dom[0].name, trust.dom[0].sid, trust.dom[0].min_id, trust.dom[0].max_id));
  74                 return NT_STATUS_OK;
  75         }
  76
  77         /* scan through the init_param-list */
  78         while (next_token(&init_param, tok, LIST_SEP, sizeof(tok))) {
  79
  80                 p = tok;
  81                 DEBUG(3,("rid_idmap_parse: parsing entry: %d\n", trust.number));
  82
  83                 /* reinit sizes */
  84                 trust.dom = (struct dom_entry *) realloc(trust.dom, sizeof(struct dom_entry)*(trust.number+1));
  85
  86                 if ( trust.dom == NULL ) {
  87                         return NT_STATUS_NO_MEMORY;
  88                 }
  89
  90                 if (!next_token(&p, tok, "=", sizeof(tok))) {
  91                         DEBUG(0, ("rid_idmap_parse: no '=' sign found in domain list [%s]\n", init_param));
  92                         return NT_STATUS_UNSUCCESSFUL;
  93                 }
  94
  95                 /* add the name */
  96                 fstrcpy(trust.dom[trust.number].name, tok);
  97                 DEBUGADD(3,("rid_idmap_parse:\tentry %d has name: [%s]\n", trust.number, trust.dom[trust.number].name));
  98
  99                 /* add the domain-sid */
 100                 for (i=0; i<num_domains; i++) {
 101
 102                         known_domain = False;
 103
 104                         if (strequal(domain_names[i], trust.dom[trust.number].name)) {
 105
 106                                 sid_to_string(sid_str, &domain_sids[i]);
 107                                 fstrcpy(trust.dom[trust.number].sid, sid_str);
 108
 109                                 DEBUGADD(3,("rid_idmap_parse:\tentry %d has sid: [%s]\n", trust.number, trust.dom[trust.number].sid));
 110                                 known_domain = True;
 111                                 break;
 112                         }
 113                 }
 114
 115                 if (!known_domain) {
 116                         DEBUG(0,("rid_idmap_parse: your DC does not know anything about domain: [%s]\n", trust.dom[trust.number].name));
 117                         return NT_STATUS_INVALID_PARAMETER;
 118                 }
 119
 120                 if (!next_token(&p, tok, "-", sizeof(tok))) {
 121                         DEBUG(0,("rid_idmap_parse: no mapping-range defined\n"));
 122                         return NT_STATUS_INVALID_PARAMETER;
 123                 }
 124
 125                 /* add min_id */
 126                 trust.dom[trust.number].min_id = atoi(tok);
 127                 DEBUGADD(3,("rid_idmap_parse:\tentry %d has min_id: [%d]\n", trust.number, trust.dom[trust.number].min_id));
 128
 129                 /* add max_id */
 130                 trust.dom[trust.number].max_id = atoi(p);
 131                 DEBUGADD(3,("rid_idmap_parse:\tentry %d has max_id: [%d]\n", trust.number, trust.dom[trust.number].max_id));
 132
 133                 trust.number++;
 134         }
 135
 136         return NT_STATUS_OK;
 137
 138 }
 139
 140 static NTSTATUS rid_idmap_get_domains(uint32 *num_domains, fstring **domain_names, DOM_SID **domain_sids)
 141 {
 142         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 143         struct cli_state *cli;
 144         TALLOC_CTX *mem_ctx;
 145         POLICY_HND pol;
 146         uint32 des_access = SEC_RIGHTS_MAXIMUM_ALLOWED;
 147         fstring dc_name;
 148         struct in_addr dc_ip;
 149         char *password = NULL;
 150         char *username = NULL;
 151         char *domain = NULL;
 152         uint32 info_class = 5;
 153         char *domain_name = NULL;
 154         DOM_SID *domain_sid, sid;
 155         fstring sid_str;
 156         int i;
 157         uint32 trusted_num_domains = 0;
 158         char **trusted_domain_names;
 159         DOM_SID *trusted_domain_sids;
 160         uint32 enum_ctx = 0;
 161         DOM_SID builtin_sid;
 162
 163         /* put the results together */
 164         *num_domains = 1;
 165         *domain_names = (fstring *) malloc(sizeof(fstring) * *num_domains);
 166         *domain_sids = (DOM_SID *) malloc(sizeof(DOM_SID) * *num_domains);
 167
 168         /* avoid calling a DC when trusted domains are not allowed anyway */
 169         if (!lp_allow_trusted_domains()) {
 170
 171                 fstrcpy((*domain_names)[0], lp_workgroup());
 172                 if (!secrets_fetch_domain_sid(lp_workgroup(), &sid)) {
 173                         DEBUG(0,("rid_idmap_get_domains: failed to retrieve domain sid\n"));
 174                         return status;
 175                 }
 176                 sid_copy(&(*domain_sids)[0], &sid);
 177
 178                 return NT_STATUS_OK;
 179         }
 180
 181         /* create mem_ctx */
 182         if (!(mem_ctx = talloc_init("rid_idmap_get_trusted_domains"))) {
 183                 DEBUG(0, ("rid_idmap_get_domains: talloc_init() failed\n"));
 184                 return NT_STATUS_NO_MEMORY;
 185         }
 186
 187         if (!get_dc_name(lp_workgroup(), 0, dc_name, &dc_ip)) {
 188                 DEBUG(1, ("rid_idmap_get_domains: could not get dc-name\n"));
 189                 return NT_STATUS_UNSUCCESSFUL;
 190         }
 191
 192         /* open a connection to the dc */
 193         username = secrets_fetch(SECRETS_AUTH_USER, NULL);
 194         password = secrets_fetch(SECRETS_AUTH_PASSWORD, NULL);
 195         domain =   secrets_fetch(SECRETS_AUTH_DOMAIN, NULL);
 196
 197         if (username) {
 198
 199                 if (!domain)
 200                         domain = smb_xstrdup(lp_workgroup());
 201
 202                 if (!password)
 203                         password = smb_xstrdup("");
 204
 205                 DEBUG(3, ("rid_idmap_get_domains: IPC$ connections done by user %s\\%s\n", domain, username));
 206
 207         } else {
 208
 209                 DEBUG(3, ("rid_idmap_get_domains: IPC$ connections done anonymously\n"));
 210                 username = "";
 211                 domain = "";
 212                 password = "";
 213         }
 214
 215         DEBUG(10, ("rid_idmap_get_domains: opening connection to [%s]\n", dc_name));
 216
 217         status = cli_full_connection(&cli, global_myname(), dc_name,
 218                         NULL, 0,
 219                         "IPC$", "IPC",
 220                         username,
 221                         lp_workgroup(),
 222                         password,
 223                         CLI_FULL_CONNECTION_ANNONYMOUS_FALLBACK, True, NULL);
 224
 225         if (!NT_STATUS_IS_OK(status)) {
 226                 DEBUG(1, ("rid_idmap_get_domains: could not setup connection to dc\n"));
 227                 return status;
 228         }
 229
 230         /* query the lsa-pipe */
 231         if (!cli_nt_session_open (cli, PI_LSARPC)) {
 232                 DEBUG(1, ("rid_idmap_get_domains: could not setup connection to dc\n"));
 233                 goto out;
 234         }
 235
 236         /* query policies */
 237         status = cli_lsa_open_policy(cli, mem_ctx, False, des_access, &pol);
 238         if (!NT_STATUS_IS_OK(status)) {
 239                 goto out;
 240         }
 241
 242         status = cli_lsa_query_info_policy(cli, mem_ctx, &pol, info_class, &domain_name, &domain_sid);
 243         if (!NT_STATUS_IS_OK(status)) {
 244                 DEBUG(1, ("rid_idmap_get_domains: cannot retrieve domain-info\n"));
 245                 goto out;
 246         }
 247
 248         sid_to_string(sid_str, domain_sid);
 249         DEBUG(10,("rid_idmap_get_domains: my domain: [%s], sid: [%s]\n", domain_name, sid_str));
 250
 251         /* scan trusted domains */
 252         DEBUG(10, ("rid_idmap_get_domains: enumerating trusted domains\n"));
 253         status = cli_lsa_enum_trust_dom(cli, mem_ctx, &pol, &enum_ctx,
 254                         &trusted_num_domains,
 255                         &trusted_domain_names,
 256                         &trusted_domain_sids);
 257
 258         if (!NT_STATUS_IS_OK(status) &&
 259             !NT_STATUS_EQUAL(status, NT_STATUS_NO_MORE_ENTRIES) &&
 260             !NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
 261                 DEBUG(1, ("rid_idmap_get_domains: could not enumerate trusted domains\n"));
 262                 goto out;
 263         }
 264
 265         /* show trusted domains */
 266         DEBUG(10,("rid_idmap_get_domains: scan for trusted domains gave %d results:\n", trusted_num_domains));
 267         for (i=0; i<trusted_num_domains; i++) {
 268                 sid_to_string(sid_str, &trusted_domain_sids[i]);
 269                 DEBUGADD(10,("rid_idmap_get_domains:\t#%d\tDOMAIN: [%s], SID: [%s]\n",
 270                                         i, trusted_domain_names[i], sid_str));
 271         }
 272
 273         int own_domains = 2;
 274         if (!sid_equal(domain_sid, get_global_sam_sid()))
 275                 ++own_domains;
 276
 277         /* put the results together */
 278         *num_domains = trusted_num_domains + own_domains;
 279         *domain_names = (fstring *) realloc(*domain_names, sizeof(fstring) * *num_domains);
 280         *domain_sids = (DOM_SID *) realloc(*domain_sids, sizeof(DOM_SID) * *num_domains);
 281
 282         /* first add mydomain */
 283         fstrcpy((*domain_names)[0], domain_name);
 284         sid_copy(&(*domain_sids)[0], domain_sid);
 285
 286         /* then add BUILTIN */
 287         string_to_sid(&builtin_sid, "S-1-5-32");
 288         fstrcpy((*domain_names)[1], "BUILTIN");
 289         sid_copy(&(*domain_sids)[1], &builtin_sid);
 290
 291         /* then add my local sid */
 292         if (!sid_equal(domain_sid, get_global_sam_sid())) {
 293                 fstrcpy((*domain_names)[2], global_myname());
 294                 sid_copy(&(*domain_sids)[2], get_global_sam_sid());
 295         }
 296
 297         /* add trusted domains */
 298         for (i=0; i<trusted_num_domains; i++) {
 299                 fstrcpy((*domain_names)[i+own_domains], trusted_domain_names[i]);
 300                 sid_copy(&((*domain_sids)[i+own_domains]), &(trusted_domain_sids[i]));
 301         }
 302
 303         /* show complete domain list */
 304         DEBUG(5,("rid_idmap_get_domains: complete domain-list has %d entries:\n", *num_domains));
 305         for (i=0; i<*num_domains; i++) {
 306                 sid_to_string(sid_str, &((*domain_sids)[i]));
 307                 DEBUGADD(5,("rid_idmap_get_domains:\t#%d\tdomain: [%s], sid: [%s]\n",
 308                                         i, (*domain_names)[i], sid_str ));
 309         }
 310
 311         status = NT_STATUS_OK;
 312
 313 out:
 314         cli_lsa_close(cli, mem_ctx, &pol);
 315         cli_nt_session_close(cli);
 316         talloc_destroy(mem_ctx);
 317         cli_shutdown(cli);
 318
 319         return status;
 320 }
 321
 322 static NTSTATUS rid_idmap_init(char *init_param)
 323 {
 324         int i, j;
 325         uid_t u_low, u_high;
 326         gid_t g_low, g_high;
 327         uint32 num_domains = 0;
 328         fstring *domain_names;
 329         DOM_SID *domain_sids;
 330         NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
 331         trust.dom = NULL;
 332
 333         /* basic sanity checks */
 334         if (!lp_idmap_uid(&u_low, &u_high) || !lp_idmap_gid(&g_low, &g_high)) {
 335                 DEBUG(0, ("rid_idmap_init: cannot get required global idmap-ranges.\n"));
 336                 return nt_status;
 337         }
 338
 339         if (u_low != g_low || u_high != g_high) {
 340                 DEBUG(0, ("rid_idmap_init: range defined in \"idmap uid\" must match range of \"idmap gid\".\n"));
 341                 return nt_status;
 342         }
 343
 344         if (lp_allow_trusted_domains()) {
 345 #if IDMAP_RID_SUPPORT_TRUSTED_DOMAINS
 346                 DEBUG(3,("rid_idmap_init: enabling trusted-domain-mapping\n"));
 347 #else
 348                 DEBUG(0,("rid_idmap_init: idmap_rid does not work with trusted domains\n"));
 349                 DEBUGADD(0,("rid_idmap_init: please set \"allow trusted domains\" to \"no\" when using idmap_rid\n"));
 350                 return nt_status;
 351 #endif
 352         }
 353
 354         /* init sizes */
 355         trust.dom = (struct dom_entry *) malloc(sizeof(struct dom_entry));
 356         if (trust.dom == NULL) {
 357                 return NT_STATUS_NO_MEMORY;
 358         }
 359
 360         /* retrieve full domain list */
 361         nt_status = rid_idmap_get_domains(&num_domains, &domain_names, &domain_sids);
 362         if (!NT_STATUS_IS_OK(nt_status) &&
 363             !NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MORE_ENTRIES) &&
 364             !NT_STATUS_EQUAL(nt_status, STATUS_MORE_ENTRIES)) {
 365                 DEBUG(0, ("rid_idmap_init: cannot fetch sids for domain and/or trusted-domains from domain-controller.\n"));
 366                 return nt_status;
 367         }
 368
 369         /* parse the init string */
 370         nt_status = rid_idmap_parse(init_param, num_domains, domain_names, domain_sids, u_low, u_high);
 371         if (!NT_STATUS_IS_OK(nt_status)) {
 372                 DEBUG(0, ("rid_idmap_init: cannot parse module-configuration\n"));
 373                 goto out;
 374         }
 375
 376         nt_status = NT_STATUS_INVALID_PARAMETER;
 377
 378         /* some basic sanity checks */
 379         for (i=0; i<trust.number; i++) {
 380
 381                 if (trust.dom[i].min_id > trust.dom[i].max_id) {
 382                         DEBUG(0, ("rid_idmap_init: min_id (%d) has to be smaller than max_id (%d) for domain [%s]\n",
 383                                                 trust.dom[i].min_id, trust.dom[i].max_id, trust.dom[i].name));
 384                         goto out;
 385                 }
 386
 387                 if (trust.dom[i].min_id < u_low || trust.dom[i].max_id > u_high) {
 388                         DEBUG(0, ("rid_idmap_init: mapping of domain [%s] (%d-%d) has to fit into global idmap range (%d-%d).\n",
 389                                                 trust.dom[i].name, trust.dom[i].min_id, trust.dom[i].max_id, u_low, u_high));
 390                         goto out;
 391                 }
 392         }
 393
 394         /* check for overlaps */
 395         for (i=0; i<trust.number-1; i++) {
 396                 for (j=i+1; j<trust.number; j++) {
 397                         if (trust.dom[i].min_id <= trust.dom[j].max_id && trust.dom[j].min_id <= trust.dom[i].max_id) {
 398                                 DEBUG(0, ("rid_idmap_init: the ranges of domain [%s] and [%s] overlap\n",
 399                                                         trust.dom[i+1].name, trust.dom[i].name));
 400                                 goto out;
 401                         }
 402                 }
 403         }
 404
 405         DEBUG(3, ("rid_idmap_init: using %d mappings:\n", trust.number));
 406         for (i=0; i<trust.number; i++) {
 407                 DEBUGADD(3, ("rid_idmap_init:\tdomain: [%s], sid: [%s], min_id: [%d], max_id: [%d]\n",
 408                                 trust.dom[i].name, trust.dom[i].sid, trust.dom[i].min_id, trust.dom[i].max_id));
 409         }
 410
 411         nt_status = NT_STATUS_OK;
 412
 413 out:
 414         SAFE_FREE(domain_names);
 415         SAFE_FREE(domain_sids);
 416
 417         return nt_status;
 418 }
 419
 420 static NTSTATUS rid_idmap_get_sid_from_id(DOM_SID *sid, unid_t unid, int id_type)
 421 {
 422         fstring sid_string;
 423         int i;
 424         DOM_SID sidstr;
 425
 426         /* find range */
 427         for (i=0; i<trust.number; i++) {
 428                 if (trust.dom[i].min_id <= unid.uid && trust.dom[i].max_id >= unid.uid )
 429                         break;
 430         }
 431
 432         if (i == trust.number) {
 433                 DEBUG(0,("rid_idmap_get_sid_from_id: no suitable range available for id: %d\n", unid.uid));
 434                 return NT_STATUS_INVALID_PARAMETER;
 435         }
 436
 437         /* use lower-end of idmap-range as offset for users and groups*/
 438         unid.uid -= trust.dom[i].min_id;
 439
 440         if (!trust.dom[i].sid)
 441                 return NT_STATUS_INVALID_PARAMETER;
 442
 443         string_to_sid(&sidstr, trust.dom[i].sid);
 444         sid_copy(sid, &sidstr);
 445         if (!sid_append_rid( sid, (unsigned long)unid.uid )) {
 446                 DEBUG(0,("rid_idmap_get_sid_from_id: could not append rid to domain sid\n"));
 447                 return NT_STATUS_NO_MEMORY;
 448         }
 449
 450         DEBUG(3, ("rid_idmap_get_sid_from_id: mapped POSIX %s %d to SID [%s]\n",
 451                 (id_type == ID_GROUPID) ? "GID" : "UID", unid.uid,
 452                 sid_to_string(sid_string, sid)));
 453
 454         return NT_STATUS_OK;
 455 }
 456
 457 static NTSTATUS rid_idmap_get_id_from_sid(unid_t *unid, int *id_type, const DOM_SID *sid)
 458 {
 459         fstring sid_string;
 460         int i;
 461         uint32 rid;
 462         DOM_SID sidstr;
 463
 464         /* check if we have a mapping for the sid */
 465         for (i=0; i<trust.number; i++) {
 466                 if (!trust.dom[i].sid) {
 467                         return NT_STATUS_INVALID_PARAMETER;
 468                 }
 469                 string_to_sid(&sidstr, trust.dom[i].sid);
 470                 if ( sid_compare_domain(sid, &sidstr) == 0 )
 471                         break;
 472         }
 473
 474         if (i == trust.number) {
 475                 DEBUG(0,("rid_idmap_get_id_from_sid: no suitable range available for sid: %s\n",
 476                         sid_string_static(sid)));
 477                 return NT_STATUS_INVALID_PARAMETER;
 478         }
 479
 480         if (!sid_peek_rid(sid, &rid)) {
 481                 DEBUG(0,("rid_idmap_get_id_from_sid: could not peek rid\n"));
 482                 return NT_STATUS_INVALID_PARAMETER;
 483         }
 484
 485         /* use lower-end of idmap-range as offset for users and groups */
 486         unid->uid = rid + trust.dom[i].min_id;
 487
 488         if (unid->uid > trust.dom[i].max_id) {
 489                 DEBUG(0,("rid_idmap_get_id_from_sid: rid: %d (%s: %d) too high for mapping of domain: %s (%d-%d)\n",
 490                         rid, (*id_type == ID_GROUPID) ? "GID" : "UID", unid->uid, trust.dom[i].name,
 491                         trust.dom[i].min_id, trust.dom[i].max_id));
 492                 return NT_STATUS_INVALID_PARAMETER;
 493         }
 494         if (unid->uid < trust.dom[i].min_id) {
 495                 DEBUG(0,("rid_idmap_get_id_from_sid: rid: %d (%s: %d) too low for mapping of domain: %s (%d-%d)\n",
 496                         rid, (*id_type == ID_GROUPID) ? "GID" : "UID", unid->uid,
 497                         trust.dom[i].name, trust.dom[i].min_id, trust.dom[i].max_id));
 498                 return NT_STATUS_INVALID_PARAMETER;
 499         }
 500
 501         DEBUG(3,("rid_idmap_get_id_from_sid: mapped SID [%s] to POSIX %s %d\n",
 502                 sid_to_string(sid_string, sid),
 503                 (*id_type == ID_GROUPID) ? "GID" : "UID", unid->uid));
 504
 505         return NT_STATUS_OK;
 506
 507 }
 508
 509 static NTSTATUS rid_idmap_set_mapping(const DOM_SID *sid, unid_t id, int id_type)
 510 {
 511         return NT_STATUS_NOT_IMPLEMENTED;
 512 }
 513
 514 static NTSTATUS rid_idmap_close(void)
 515 {
 516         SAFE_FREE(trust.dom);
 517
 518         return NT_STATUS_OK;
 519 }
 520
 521 static NTSTATUS rid_idmap_allocate_rid(uint32 *rid, int rid_type)
 522 {
 523         return NT_STATUS_NOT_IMPLEMENTED;
 524 }
 525
 526 static NTSTATUS rid_idmap_allocate_id(unid_t *id, int id_type)
 527 {
 528         return NT_STATUS_NOT_IMPLEMENTED;
 529 }
 530
 531 static void rid_idmap_status(void)
 532 {
 533         DEBUG(0, ("RID IDMAP Status not available\n"));
 534 }
 535
 536 static struct idmap_methods rid_methods = {
 537         rid_idmap_init,
 538         rid_idmap_allocate_rid,
 539         rid_idmap_allocate_id,
 540         rid_idmap_get_sid_from_id,
 541         rid_idmap_get_id_from_sid,
 542         rid_idmap_set_mapping,
 543         rid_idmap_close,
 544         rid_idmap_status
 545 };
 546
 547 NTSTATUS init_module(void)
 548 {
 549         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "idmap_rid", &rid_methods);
 550 }
 551