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