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