source/nsswitch/winbindd_sid.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon - sid related functions
   5
   6    Copyright (C) Tim Potter 2000
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "winbindd.h"
  24
  25 #undef DBGC_CLASS
  26 #define DBGC_CLASS DBGC_WINBIND
  27
  28 /* Convert a string  */
  29
  30 enum winbindd_result winbindd_lookupsid(struct winbindd_cli_state *state)
  31 {
  32         extern DOM_SID global_sid_Builtin;
  33         enum SID_NAME_USE type;
  34         DOM_SID sid, tmp_sid;
  35         uint32 rid;
  36         fstring name;
  37         fstring dom_name;
  38
  39         /* Ensure null termination */
  40         state->request.data.sid[sizeof(state->request.data.sid)-1]='\0';
  41
  42         DEBUG(3, ("[%5lu]: lookupsid %s\n", (unsigned long)state->pid,
  43                   state->request.data.sid));
  44
  45         /* Lookup sid from PDC using lsa_lookup_sids() */
  46
  47         if (!string_to_sid(&sid, state->request.data.sid)) {
  48                 DEBUG(5, ("%s not a SID\n", state->request.data.sid));
  49                 return WINBINDD_ERROR;
  50         }
  51
  52         /* Don't look up BUILTIN sids */
  53
  54         sid_copy(&tmp_sid, &sid);
  55         sid_split_rid(&tmp_sid, &rid);
  56
  57         if (sid_equal(&tmp_sid, &global_sid_Builtin)) {
  58                 return WINBINDD_ERROR;
  59         }
  60
  61         /* Lookup the sid */
  62
  63         if (!winbindd_lookup_name_by_sid(&sid, dom_name, name, &type)) {
  64                 return WINBINDD_ERROR;
  65         }
  66
  67         fstrcpy(state->response.data.name.dom_name, dom_name);
  68         fstrcpy(state->response.data.name.name, name);
  69
  70         state->response.data.name.type = type;
  71
  72         return WINBINDD_OK;
  73 }
  74
  75
  76 /**
  77  * Look up the SID for a qualified name.
  78  **/
  79 enum winbindd_result winbindd_lookupname(struct winbindd_cli_state *state)
  80 {
  81         enum SID_NAME_USE type;
  82         fstring sid_str;
  83         char *name_domain, *name_user;
  84         DOM_SID sid;
  85         struct winbindd_domain *domain;
  86
  87         /* Ensure null termination */
  88         state->request.data.sid[sizeof(state->request.data.name.dom_name)-1]='\0';
  89
  90         /* Ensure null termination */
  91         state->request.data.sid[sizeof(state->request.data.name.name)-1]='\0';
  92
  93         DEBUG(3, ("[%5lu]: lookupname %s%s%s\n", (unsigned long)state->pid,
  94                   state->request.data.name.dom_name,
  95                   lp_winbind_separator(),
  96                   state->request.data.name.name));
  97
  98         name_domain = state->request.data.name.dom_name;
  99         name_user = state->request.data.name.name;
 100
 101         if ((domain = find_domain_from_name(name_domain)) == NULL) {
 102                 DEBUG(0, ("could not find domain entry for domain %s\n",
 103                           name_domain));
 104                 return WINBINDD_ERROR;
 105         }
 106
 107         /* Lookup name from PDC using lsa_lookup_names() */
 108         if (!winbindd_lookup_sid_by_name(domain, name_user, &sid, &type)) {
 109                 return WINBINDD_ERROR;
 110         }
 111
 112         sid_to_string(sid_str, &sid);
 113         fstrcpy(state->response.data.sid.sid, sid_str);
 114         state->response.data.sid.type = type;
 115
 116         return WINBINDD_OK;
 117 }
 118
 119 /* Convert a sid to a uid.  We assume we only have one rid attached to the
 120    sid. */
 121
 122 enum winbindd_result winbindd_sid_to_uid(struct winbindd_cli_state *state)
 123 {
 124         DOM_SID sid;
 125         uint32 flags = 0x0;
 126
 127         /* Ensure null termination */
 128         state->request.data.sid[sizeof(state->request.data.sid)-1]='\0';
 129
 130         DEBUG(3, ("[%5lu]: sid to uid %s\n", (unsigned long)state->pid,
 131                   state->request.data.sid));
 132
 133         if (!string_to_sid(&sid, state->request.data.sid)) {
 134                 DEBUG(1, ("Could not get convert sid %s from string\n", state->request.data.sid));
 135                 return WINBINDD_ERROR;
 136         }
 137
 138         /* This gets a little tricky.  If we assume that usernames are syncd between
 139            /etc/passwd and the windows domain (such as a member of a Samba domain),
 140            the we need to get the uid from the OS and not alocate one ourselves */
 141
 142         if ( lp_winbind_trusted_domains_only() ) {
 143                 struct winbindd_domain *domain = NULL;
 144                 DOM_SID sid2;
 145                 uint32 rid;
 146
 147                 domain = find_domain_from_name( lp_workgroup() );
 148                 if ( !domain ) {
 149                         DEBUG(0,("winbindd_sid_to_uid: can't find my own domain!\n"));
 150                         return WINBINDD_ERROR;
 151                 }
 152
 153                 sid_copy( &sid2, &sid );
 154                 sid_split_rid( &sid2, &rid );
 155
 156                 if ( sid_equal( &sid2, &domain->sid ) ) {
 157
 158                         fstring domain_name;
 159                         fstring user;
 160                         enum SID_NAME_USE type;
 161                         struct passwd *pw = NULL;
 162                         unid_t id;
 163
 164                         /* ok...here's we know that we are dealing with our
 165                            own domain (the one to which we are joined).  And
 166                            we know that there must be a UNIX account for this user.
 167                            So we lookup the sid and the call getpwnam().*/
 168
 169
 170                         /* But first check and see if we don't already have a mapping */
 171
 172                         flags = ID_QUERY_ONLY;
 173                         if ( NT_STATUS_IS_OK(idmap_sid_to_uid(&sid, &(state->response.data.uid), flags)) )
 174                                 return WINBINDD_OK;
 175
 176                         /* now fall back to the hard way */
 177
 178                         if ( !winbindd_lookup_name_by_sid(&sid, domain_name, user, &type) )
 179                                 return WINBINDD_ERROR;
 180
 181                         if ( !(pw = getpwnam(user)) ) {
 182                                 DEBUG(0,("winbindd_sid_to_uid: 'winbind trusted domains only' is "
 183                                         "set but this user [%s] doesn't exist!\n", user));
 184                                 return WINBINDD_ERROR;
 185                         }
 186
 187                         state->response.data.uid = pw->pw_uid;
 188
 189                         id.uid = pw->pw_uid;
 190                         idmap_set_mapping( &sid, id, ID_USERID );
 191
 192                         return WINBINDD_OK;
 193                 }
 194
 195         }
 196
 197         if ( state->request.flags & WBFLAG_QUERY_ONLY )
 198                 flags = ID_QUERY_ONLY;
 199
 200         /* Find uid for this sid and return it */
 201
 202         if ( !NT_STATUS_IS_OK(idmap_sid_to_uid(&sid, &(state->response.data.uid), flags)) ) {
 203                 DEBUG(1, ("Could not get uid for sid %s\n", state->request.data.sid));
 204                 return WINBINDD_ERROR;
 205         }
 206
 207         return WINBINDD_OK;
 208 }
 209
 210 /* Convert a sid to a gid.  We assume we only have one rid attached to the
 211    sid.*/
 212
 213 enum winbindd_result winbindd_sid_to_gid(struct winbindd_cli_state *state)
 214 {
 215         DOM_SID sid;
 216         uint32 flags = 0x0;
 217
 218         /* Ensure null termination */
 219         state->request.data.sid[sizeof(state->request.data.sid)-1]='\0';
 220
 221         DEBUG(3, ("[%5lu]: sid to gid %s\n", (unsigned long)state->pid,
 222                   state->request.data.sid));
 223
 224         if (!string_to_sid(&sid, state->request.data.sid)) {
 225                 DEBUG(1, ("Could not cvt string to sid %s\n", state->request.data.sid));
 226                 return WINBINDD_ERROR;
 227         }
 228
 229         /* This gets a little tricky.  If we assume that usernames are syncd between
 230            /etc/passwd and the windows domain (such as a member of a Samba domain),
 231            the we need to get the uid from the OS and not alocate one ourselves */
 232
 233         if ( lp_winbind_trusted_domains_only() ) {
 234                 struct winbindd_domain *domain = NULL;
 235                 DOM_SID sid2;
 236                 uint32 rid;
 237                 unid_t id;
 238
 239                 domain = find_domain_from_name( lp_workgroup() );
 240                 if ( !domain ) {
 241                         DEBUG(0,("winbindd_sid_to_uid: can't find my own domain!\n"));
 242                         return WINBINDD_ERROR;
 243                 }
 244
 245                 sid_copy( &sid2, &sid );
 246                 sid_split_rid( &sid2, &rid );
 247
 248                 if ( sid_equal( &sid2, &domain->sid ) ) {
 249
 250                         fstring domain_name;
 251                         fstring group;
 252                         enum SID_NAME_USE type;
 253                         struct group *grp = NULL;
 254
 255                         /* ok...here's we know that we are dealing with our
 256                            own domain (the one to which we are joined).  And
 257                            we know that there must be a UNIX account for this group.
 258                            So we lookup the sid and the call getpwnam().*/
 259
 260                         /* But first check and see if we don't already have a mapping */
 261
 262                         flags = ID_QUERY_ONLY;
 263                         if ( NT_STATUS_IS_OK(idmap_sid_to_gid(&sid, &(state->response.data.gid), flags)) )
 264                                 return WINBINDD_OK;
 265
 266                         /* now fall back to the hard way */
 267
 268                         if ( !winbindd_lookup_name_by_sid(&sid, domain_name, group, &type) )
 269                                 return WINBINDD_ERROR;
 270
 271                         if ( !(grp = getgrnam(group)) ) {
 272                                 DEBUG(0,("winbindd_sid_to_uid: 'winbind trusted domains only' is "
 273                                         "set but this group [%s] doesn't exist!\n", group));
 274                                 return WINBINDD_ERROR;
 275                         }
 276
 277                         state->response.data.gid = grp->gr_gid;
 278
 279                         id.gid = grp->gr_gid;
 280                         idmap_set_mapping( &sid, id, ID_GROUPID );
 281
 282                         return WINBINDD_OK;
 283                 }
 284
 285         }
 286
 287         if ( state->request.flags & WBFLAG_QUERY_ONLY )
 288                 flags = ID_QUERY_ONLY;
 289
 290         /* Find gid for this sid and return it */
 291         if ( !NT_STATUS_IS_OK(idmap_sid_to_gid(&sid, &(state->response.data.gid), flags)) ) {
 292                 DEBUG(1, ("Could not get gid for sid %s\n", state->request.data.sid));
 293                 return WINBINDD_ERROR;
 294         }
 295
 296         return WINBINDD_OK;
 297 }
 298
 299 /* Convert a uid to a sid */
 300
 301 enum winbindd_result winbindd_uid_to_sid(struct winbindd_cli_state *state)
 302 {
 303         DOM_SID sid;
 304
 305         DEBUG(3, ("[%5lu]: uid to sid %lu\n", (unsigned long)state->pid,
 306                   (unsigned long)state->request.data.uid));
 307
 308         if ( (state->request.data.uid < server_state.uid_low )
 309                 || (state->request.data.uid > server_state.uid_high) )
 310         {
 311                 struct passwd *pw = NULL;
 312                 enum SID_NAME_USE type;
 313                 unid_t id;
 314                 struct winbindd_domain *domain;
 315
 316                 /* SPECIAL CASE FOR MEMBERS OF SAMBA DOMAINS */
 317
 318                 /* if we don't trust /etc/password then when can't know
 319                    anything about this uid */
 320
 321                 if ( !lp_winbind_trusted_domains_only() )
 322                         return WINBINDD_ERROR;
 323
 324
 325                 /* look for an idmap entry first */
 326
 327                 if ( NT_STATUS_IS_OK(idmap_uid_to_sid(&sid, state->request.data.uid)) )
 328                         goto done;
 329
 330                 /* if users exist in /etc/passwd, we should try to
 331                    use that uid. Get the username and the lookup the SID */
 332
 333                 if ( !(pw = getpwuid(state->request.data.uid)) )
 334                         return WINBINDD_ERROR;
 335
 336                 if ( !(domain = find_domain_from_name(lp_workgroup())) ) {
 337                         DEBUG(0,("winbindd_uid_to_sid: can't find my own domain!\n"));
 338                         return WINBINDD_ERROR;
 339                 }
 340
 341                 if ( !winbindd_lookup_sid_by_name(domain, pw->pw_name, &sid, &type) )
 342                         return WINBINDD_ERROR;
 343
 344                 if ( type != SID_NAME_USER )
 345                         return WINBINDD_ERROR;
 346
 347                 /* don't fail if we can't store it */
 348
 349                 id.uid = pw->pw_uid;
 350                 idmap_set_mapping( &sid, id, ID_USERID );
 351
 352                 goto done;
 353         }
 354
 355         /* Lookup rid for this uid */
 356
 357         if (!NT_STATUS_IS_OK(idmap_uid_to_sid(&sid, state->request.data.uid))) {
 358                 DEBUG(1, ("Could not convert uid %lu to rid\n",
 359                           (unsigned long)state->request.data.uid));
 360                 return WINBINDD_ERROR;
 361         }
 362
 363 done:
 364         sid_to_string(state->response.data.sid.sid, &sid);
 365         state->response.data.sid.type = SID_NAME_USER;
 366
 367         return WINBINDD_OK;
 368 }
 369
 370 /* Convert a gid to a sid */
 371
 372 enum winbindd_result winbindd_gid_to_sid(struct winbindd_cli_state *state)
 373 {
 374         DOM_SID sid;
 375
 376         DEBUG(3, ("[%5lu]: gid to sid %lu\n", (unsigned long)state->pid,
 377                   (unsigned long)state->request.data.gid));
 378
 379         if ( (state->request.data.gid < server_state.gid_low)
 380                 || (state->request.data.gid > server_state.gid_high) )
 381         {
 382                 struct group *grp = NULL;
 383                 enum SID_NAME_USE type;
 384                 unid_t id;
 385                 struct winbindd_domain *domain;
 386
 387                 /* SPECIAL CASE FOR MEMBERS OF SAMBA DOMAINS */
 388
 389                 /* if we don't trust /etc/group then when can't know
 390                    anything about this gid */
 391
 392                 if ( !lp_winbind_trusted_domains_only() )
 393                         return WINBINDD_ERROR;
 394
 395                 /* look for an idmap entry first */
 396
 397                 if ( NT_STATUS_IS_OK(idmap_gid_to_sid(&sid, state->request.data.gid)) )
 398                         goto done;
 399
 400                 /* if users exist in /etc/group, we should try to
 401                    use that gid. Get the username and the lookup the SID */
 402
 403                 if ( !(grp = getgrgid(state->request.data.gid)) )
 404                         return WINBINDD_ERROR;
 405
 406                 if ( !(domain = find_domain_from_name(lp_workgroup())) ) {
 407                         DEBUG(0,("winbindd_uid_to_sid: can't find my own domain!\n"));
 408                         return WINBINDD_ERROR;
 409                 }
 410
 411                 if ( !winbindd_lookup_sid_by_name(domain, grp->gr_name, &sid, &type) )
 412                         return WINBINDD_ERROR;
 413
 414                 if ( type!=SID_NAME_DOM_GRP && type!=SID_NAME_ALIAS )
 415                         return WINBINDD_ERROR;
 416
 417                 /* don't fail if we can't store it */
 418
 419                 id.gid = grp->gr_gid;
 420                 idmap_set_mapping( &sid, id, ID_GROUPID );
 421
 422                 goto done;
 423         }
 424
 425         /* Lookup sid for this uid */
 426
 427         if (!NT_STATUS_IS_OK(idmap_gid_to_sid(&sid, state->request.data.gid))) {
 428                 DEBUG(1, ("Could not convert gid %lu to sid\n",
 429                           (unsigned long)state->request.data.gid));
 430                 return WINBINDD_ERROR;
 431         }
 432
 433 done:
 434         /* Construct sid and return it */
 435         sid_to_string(state->response.data.sid.sid, &sid);
 436         state->response.data.sid.type = SID_NAME_DOM_GRP;
 437
 438         return WINBINDD_OK;
 439 }