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 "includes.h"
  24 #include "winbindd.h"
  25
  26 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_WINBIND
  28
  29 /* Convert a string  */
  30
  31 enum winbindd_result winbindd_lookupsid(struct winbindd_cli_state *state)
  32 {
  33         enum SID_NAME_USE type;
  34         DOM_SID sid;
  35         fstring name;
  36         fstring dom_name;
  37
  38         /* Ensure null termination */
  39         state->request.data.sid[sizeof(state->request.data.sid)-1]='\0';
  40
  41         DEBUG(3, ("[%5lu]: lookupsid %s\n", (unsigned long)state->pid,
  42                   state->request.data.sid));
  43
  44         /* Lookup sid from PDC using lsa_lookup_sids() */
  45
  46         if (!string_to_sid(&sid, state->request.data.sid)) {
  47                 DEBUG(5, ("%s not a SID\n", state->request.data.sid));
  48                 return WINBINDD_ERROR;
  49         }
  50
  51         /* Lookup the sid */
  52
  53         if (!winbindd_lookup_name_by_sid(&sid, dom_name, name, &type)) {
  54                 return WINBINDD_ERROR;
  55         }
  56
  57         fstrcpy(state->response.data.name.dom_name, dom_name);
  58         fstrcpy(state->response.data.name.name, name);
  59
  60         state->response.data.name.type = type;
  61
  62         return WINBINDD_OK;
  63 }
  64
  65
  66 /**
  67  * Look up the SID for a qualified name.
  68  **/
  69 enum winbindd_result winbindd_lookupname(struct winbindd_cli_state *state)
  70 {
  71         enum SID_NAME_USE type;
  72         fstring sid_str;
  73         char *name_domain, *name_user;
  74         DOM_SID sid;
  75         struct winbindd_domain *domain;
  76         char *p;
  77
  78         /* Ensure null termination */
  79         state->request.data.sid[sizeof(state->request.data.name.dom_name)-1]='\0';
  80
  81         /* Ensure null termination */
  82         state->request.data.sid[sizeof(state->request.data.name.name)-1]='\0';
  83
  84         /* cope with the name being a fully qualified name */
  85         p = strstr(state->request.data.name.name, lp_winbind_separator());
  86         if (p) {
  87                 *p = 0;
  88                 name_domain = state->request.data.name.name;
  89                 name_user = p+1;
  90         } else {
  91                 name_domain = state->request.data.name.dom_name;
  92                 name_user = state->request.data.name.name;
  93         }
  94
  95         DEBUG(3, ("[%5lu]: lookupname %s%s%s\n", (unsigned long)state->pid,
  96                   name_domain, lp_winbind_separator(), name_user));
  97
  98         if ((domain = find_lookup_domain_from_name(name_domain)) == NULL) {
  99                 DEBUG(0, ("could not find domain entry for domain %s\n",
 100                           name_domain));
 101                 return WINBINDD_ERROR;
 102         }
 103
 104         /* Lookup name from PDC using lsa_lookup_names() */
 105         if (!winbindd_lookup_sid_by_name(domain, name_domain, name_user, &sid, &type)) {
 106                 return WINBINDD_ERROR;
 107         }
 108
 109         sid_to_string(sid_str, &sid);
 110         fstrcpy(state->response.data.sid.sid, sid_str);
 111         state->response.data.sid.type = type;
 112
 113         return WINBINDD_OK;
 114 }
 115
 116 /* Convert a sid to a uid.  We assume we only have one rid attached to the
 117    sid. */
 118
 119 enum winbindd_result winbindd_sid_to_uid(struct winbindd_cli_state *state)
 120 {
 121         DOM_SID sid;
 122         uint32 flags = 0x0;
 123
 124         /* Ensure null termination */
 125         state->request.data.sid[sizeof(state->request.data.sid)-1]='\0';
 126
 127         DEBUG(3, ("[%5lu]: sid to uid %s\n", (unsigned long)state->pid,
 128                   state->request.data.sid));
 129
 130         if (!string_to_sid(&sid, state->request.data.sid)) {
 131                 DEBUG(1, ("Could not get convert sid %s from string\n", state->request.data.sid));
 132                 return WINBINDD_ERROR;
 133         }
 134
 135         /* This gets a little tricky.  If we assume that usernames are syncd between
 136            /etc/passwd and the windows domain (such as a member of a Samba domain),
 137            the we need to get the uid from the OS and not alocate one ourselves */
 138
 139         if ( lp_winbind_trusted_domains_only() ) {
 140                 struct winbindd_domain *domain = NULL;
 141                 DOM_SID sid2;
 142                 uint32 rid;
 143
 144                 domain = find_our_domain();
 145                 if ( !domain ) {
 146                         DEBUG(0,("winbindd_sid_to_uid: can't find my own domain!\n"));
 147                         return WINBINDD_ERROR;
 148                 }
 149
 150                 sid_copy( &sid2, &sid );
 151                 sid_split_rid( &sid2, &rid );
 152
 153                 if ( sid_equal( &sid2, &domain->sid ) ) {
 154
 155                         fstring domain_name;
 156                         fstring user;
 157                         enum SID_NAME_USE type;
 158                         struct passwd *pw = NULL;
 159                         unid_t id;
 160
 161                         /* ok...here's we know that we are dealing with our
 162                            own domain (the one to which we are joined).  And
 163                            we know that there must be a UNIX account for this user.
 164                            So we lookup the sid and the call getpwnam().*/
 165
 166
 167                         /* But first check and see if we don't already have a mapping */
 168
 169                         flags = ID_QUERY_ONLY;
 170                         if ( NT_STATUS_IS_OK(idmap_sid_to_uid(&sid, &(state->response.data.uid), flags)) )
 171                                 return WINBINDD_OK;
 172
 173                         /* now fall back to the hard way */
 174
 175                         if ( !winbindd_lookup_name_by_sid(&sid, domain_name, user, &type) )
 176                                 return WINBINDD_ERROR;
 177
 178                         if ( !(pw = getpwnam(user)) ) {
 179                                 DEBUG(0,("winbindd_sid_to_uid: 'winbind trusted domains only' is "
 180                                         "set but this user [%s] doesn't exist!\n", user));
 181                                 return WINBINDD_ERROR;
 182                         }
 183
 184                         state->response.data.uid = pw->pw_uid;
 185
 186                         id.uid = pw->pw_uid;
 187                         idmap_set_mapping( &sid, id, ID_USERID );
 188
 189                         return WINBINDD_OK;
 190                 }
 191
 192         }
 193
 194         if ( state->request.flags & WBFLAG_QUERY_ONLY )
 195                 flags = ID_QUERY_ONLY;
 196
 197         /* Find uid for this sid and return it */
 198
 199         if ( !NT_STATUS_IS_OK(idmap_sid_to_uid(&sid, &(state->response.data.uid), flags)) ) {
 200                 DEBUG(1, ("Could not get uid for sid %s\n", state->request.data.sid));
 201                 return WINBINDD_ERROR;
 202         }
 203
 204         return WINBINDD_OK;
 205 }
 206
 207 /* Convert a sid to a gid.  We assume we only have one rid attached to the
 208    sid.*/
 209
 210 enum winbindd_result winbindd_sid_to_gid(struct winbindd_cli_state *state)
 211 {
 212         DOM_SID sid;
 213         uint32 flags = 0x0;
 214
 215         /* Ensure null termination */
 216         state->request.data.sid[sizeof(state->request.data.sid)-1]='\0';
 217
 218         DEBUG(3, ("[%5lu]: sid to gid %s\n", (unsigned long)state->pid,
 219                   state->request.data.sid));
 220
 221         if (!string_to_sid(&sid, state->request.data.sid)) {
 222                 DEBUG(1, ("Could not cvt string to sid %s\n", state->request.data.sid));
 223                 return WINBINDD_ERROR;
 224         }
 225
 226         /* This gets a little tricky.  If we assume that usernames are syncd between
 227            /etc/passwd and the windows domain (such as a member of a Samba domain),
 228            the we need to get the uid from the OS and not alocate one ourselves */
 229
 230         if ( lp_winbind_trusted_domains_only() ) {
 231                 struct winbindd_domain *domain = NULL;
 232                 DOM_SID sid2;
 233                 uint32 rid;
 234                 unid_t id;
 235
 236                 domain = find_our_domain();
 237                 if ( !domain ) {
 238                         DEBUG(0,("winbindd_sid_to_uid: can't find my own domain!\n"));
 239                         return WINBINDD_ERROR;
 240                 }
 241
 242                 sid_copy( &sid2, &sid );
 243                 sid_split_rid( &sid2, &rid );
 244
 245                 if ( sid_equal( &sid2, &domain->sid ) ) {
 246
 247                         fstring domain_name;
 248                         fstring group;
 249                         enum SID_NAME_USE type;
 250                         struct group *grp = NULL;
 251
 252                         /* ok...here's we know that we are dealing with our
 253                            own domain (the one to which we are joined).  And
 254                            we know that there must be a UNIX account for this group.
 255                            So we lookup the sid and the call getpwnam().*/
 256
 257                         /* But first check and see if we don't already have a mapping */
 258
 259                         flags = ID_QUERY_ONLY;
 260                         if ( NT_STATUS_IS_OK(idmap_sid_to_gid(&sid, &(state->response.data.gid), flags)) )
 261                                 return WINBINDD_OK;
 262
 263                         /* now fall back to the hard way */
 264
 265                         if ( !winbindd_lookup_name_by_sid(&sid, domain_name, group, &type) )
 266                                 return WINBINDD_ERROR;
 267
 268                         if ( !(grp = getgrnam(group)) ) {
 269                                 DEBUG(0,("winbindd_sid_to_uid: 'winbind trusted domains only' is "
 270                                         "set but this group [%s] doesn't exist!\n", group));
 271                                 return WINBINDD_ERROR;
 272                         }
 273
 274                         state->response.data.gid = grp->gr_gid;
 275
 276                         id.gid = grp->gr_gid;
 277                         idmap_set_mapping( &sid, id, ID_GROUPID );
 278
 279                         return WINBINDD_OK;
 280                 }
 281
 282         }
 283
 284         if ( state->request.flags & WBFLAG_QUERY_ONLY )
 285                 flags = ID_QUERY_ONLY;
 286
 287         /* Find gid for this sid and return it */
 288         if ( !NT_STATUS_IS_OK(idmap_sid_to_gid(&sid, &(state->response.data.gid), flags)) ) {
 289                 DEBUG(1, ("Could not get gid for sid %s\n", state->request.data.sid));
 290                 return WINBINDD_ERROR;
 291         }
 292
 293         return WINBINDD_OK;
 294 }
 295
 296 /* Convert a uid to a sid */
 297
 298 enum winbindd_result winbindd_uid_to_sid(struct winbindd_cli_state *state)
 299 {
 300         DOM_SID sid;
 301
 302         DEBUG(3, ("[%5lu]: uid to sid %lu\n", (unsigned long)state->pid,
 303                   (unsigned long)state->request.data.uid));
 304
 305         if ( (state->request.data.uid < server_state.uid_low )
 306                 || (state->request.data.uid > server_state.uid_high) )
 307         {
 308                 struct passwd *pw = NULL;
 309                 enum SID_NAME_USE type;
 310                 unid_t id;
 311                 struct winbindd_domain *domain;
 312
 313                 /* SPECIAL CASE FOR MEMBERS OF SAMBA DOMAINS */
 314
 315                 /* if we don't trust /etc/password then when can't know
 316                    anything about this uid */
 317
 318                 if ( !lp_winbind_trusted_domains_only() )
 319                         return WINBINDD_ERROR;
 320
 321
 322                 /* look for an idmap entry first */
 323
 324                 if ( NT_STATUS_IS_OK(idmap_uid_to_sid(&sid, state->request.data.uid)) )
 325                         goto done;
 326
 327                 /* if users exist in /etc/passwd, we should try to
 328                    use that uid. Get the username and the lookup the SID */
 329
 330                 if ( !(pw = getpwuid(state->request.data.uid)) )
 331                         return WINBINDD_ERROR;
 332
 333                 if ( !(domain = find_our_domain()) ) {
 334                         DEBUG(0,("winbindd_uid_to_sid: can't find my own domain!\n"));
 335                         return WINBINDD_ERROR;
 336                 }
 337
 338                 if ( !winbindd_lookup_sid_by_name(domain, domain->name, pw->pw_name, &sid, &type) )
 339                         return WINBINDD_ERROR;
 340
 341                 if ( type != SID_NAME_USER )
 342                         return WINBINDD_ERROR;
 343
 344                 /* don't fail if we can't store it */
 345
 346                 id.uid = pw->pw_uid;
 347                 idmap_set_mapping( &sid, id, ID_USERID );
 348
 349                 goto done;
 350         }
 351
 352         /* Lookup rid for this uid */
 353
 354         if (!NT_STATUS_IS_OK(idmap_uid_to_sid(&sid, state->request.data.uid))) {
 355                 DEBUG(1, ("Could not convert uid %lu to rid\n",
 356                           (unsigned long)state->request.data.uid));
 357                 return WINBINDD_ERROR;
 358         }
 359
 360 done:
 361         sid_to_string(state->response.data.sid.sid, &sid);
 362         state->response.data.sid.type = SID_NAME_USER;
 363
 364         return WINBINDD_OK;
 365 }
 366
 367 /* Convert a gid to a sid */
 368
 369 enum winbindd_result winbindd_gid_to_sid(struct winbindd_cli_state *state)
 370 {
 371         DOM_SID sid;
 372
 373         DEBUG(3, ("[%5lu]: gid to sid %lu\n", (unsigned long)state->pid,
 374                   (unsigned long)state->request.data.gid));
 375
 376         if ( (state->request.data.gid < server_state.gid_low)
 377                 || (state->request.data.gid > server_state.gid_high) )
 378         {
 379                 struct group *grp = NULL;
 380                 enum SID_NAME_USE type;
 381                 unid_t id;
 382                 struct winbindd_domain *domain;
 383
 384                 /* SPECIAL CASE FOR MEMBERS OF SAMBA DOMAINS */
 385
 386                 /* if we don't trust /etc/group then when can't know
 387                    anything about this gid */
 388
 389                 if ( !lp_winbind_trusted_domains_only() )
 390                         return WINBINDD_ERROR;
 391
 392                 /* look for an idmap entry first */
 393
 394                 if ( NT_STATUS_IS_OK(idmap_gid_to_sid(&sid, state->request.data.gid)) )
 395                         goto done;
 396
 397                 /* if users exist in /etc/group, we should try to
 398                    use that gid. Get the username and the lookup the SID */
 399
 400                 if ( !(grp = getgrgid(state->request.data.gid)) )
 401                         return WINBINDD_ERROR;
 402
 403                 if ( !(domain = find_our_domain()) ) {
 404                         DEBUG(0,("winbindd_uid_to_sid: can't find my own domain!\n"));
 405                         return WINBINDD_ERROR;
 406                 }
 407
 408                 if ( !winbindd_lookup_sid_by_name(domain, domain->name, grp->gr_name, &sid, &type) )
 409                         return WINBINDD_ERROR;
 410
 411                 if ( type!=SID_NAME_DOM_GRP && type!=SID_NAME_ALIAS )
 412                         return WINBINDD_ERROR;
 413
 414                 /* don't fail if we can't store it */
 415
 416                 id.gid = grp->gr_gid;
 417                 idmap_set_mapping( &sid, id, ID_GROUPID );
 418
 419                 goto done;
 420         }
 421
 422         /* Lookup sid for this uid */
 423
 424         if (!NT_STATUS_IS_OK(idmap_gid_to_sid(&sid, state->request.data.gid))) {
 425                 DEBUG(1, ("Could not convert gid %lu to sid\n",
 426                           (unsigned long)state->request.data.gid));
 427                 return WINBINDD_ERROR;
 428         }
 429
 430 done:
 431         /* Construct sid and return it */
 432         sid_to_string(state->response.data.sid.sid, &sid);
 433         state->response.data.sid.type = SID_NAME_DOM_GRP;
 434
 435         return WINBINDD_OK;
 436 }
 437
 438 enum winbindd_result winbindd_allocate_rid(struct winbindd_cli_state *state)
 439 {
 440         if ( !state->privileged ) {
 441                 DEBUG(2, ("winbindd_allocate_rid: non-privileged access "
 442                           "denied!\n"));
 443                 return WINBINDD_ERROR;
 444         }
 445
 446         /* We tell idmap to always allocate a user RID. There might be a good
 447          * reason to keep RID allocation for users to even and groups to
 448          * odd. This needs discussion I think. For now only allocate user
 449          * rids. */
 450
 451         if (!NT_STATUS_IS_OK(idmap_allocate_rid(&state->response.data.rid,
 452                                                 USER_RID_TYPE)))
 453                 return WINBINDD_ERROR;
 454
 455         return WINBINDD_OK;
 456 }