libcli/security/util_sid.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba utility functions
   4    Copyright (C) Andrew Tridgell                1992-1998
   5    Copyright (C) Luke Kenneth Caseson Leighton  1998-1999
   6    Copyright (C) Jeremy Allison                 1999
   7    Copyright (C) Stefan (metze) Metzmacher      2002
   8    Copyright (C) Simo Sorce                     2002
   9    Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2005
  10    Copyright (C) Andrew Bartlett                2010
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 #include "includes.h"
  27 #include "../librpc/gen_ndr/ndr_security.h"
  28 #include "../librpc/gen_ndr/netlogon.h"
  29 #include "../libcli/security/security.h"
  30
  31 /*
  32  * Some useful sids, more well known sids can be found at
  33  * http://support.microsoft.com/kb/243330/EN-US/
  34  */
  35
  36
  37 const struct dom_sid global_sid_World_Domain =               /* Everyone domain */
  38 { 1, 0, {0,0,0,0,0,1}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  39 const struct dom_sid global_sid_World =                      /* Everyone */
  40 { 1, 1, {0,0,0,0,0,1}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  41 const struct dom_sid global_sid_Creator_Owner_Domain =       /* Creator Owner domain */
  42 { 1, 0, {0,0,0,0,0,3}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  43 const struct dom_sid global_sid_NT_Authority =                  /* NT Authority */
  44 { 1, 0, {0,0,0,0,0,5}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  45 const struct dom_sid global_sid_System =                        /* System */
  46 { 1, 1, {0,0,0,0,0,5}, {18,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  47 const struct dom_sid global_sid_NULL =                          /* NULL sid */
  48 { 1, 1, {0,0,0,0,0,0}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  49 const struct dom_sid global_sid_Authenticated_Users =   /* All authenticated rids */
  50 { 1, 1, {0,0,0,0,0,5}, {11,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  51 #if 0
  52 /* for documentation */
  53 const struct dom_sid global_sid_Restriced =                     /* Restriced Code */
  54 { 1, 1, {0,0,0,0,0,5}, {12,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  55 #endif
  56 const struct dom_sid global_sid_Network =                       /* Network rids */
  57 { 1, 1, {0,0,0,0,0,5}, {2,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  58
  59 const struct dom_sid global_sid_Creator_Owner =         /* Creator Owner */
  60 { 1, 1, {0,0,0,0,0,3}, {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  61 const struct dom_sid global_sid_Creator_Group =         /* Creator Group */
  62 { 1, 1, {0,0,0,0,0,3}, {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  63 const struct dom_sid global_sid_Anonymous =                     /* Anonymous login */
  64 { 1, 1, {0,0,0,0,0,5}, {7,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  65 const struct dom_sid global_sid_Enterprise_DCs =                /* Enterprise DCs */
  66 { 1, 1, {0,0,0,0,0,5}, {9,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  67 const struct dom_sid global_sid_Builtin =                       /* Local well-known domain */
  68 { 1, 1, {0,0,0,0,0,5}, {32,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  69 const struct dom_sid global_sid_Builtin_Administrators =        /* Builtin administrators */
  70 { 1, 2, {0,0,0,0,0,5}, {32,544,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  71 const struct dom_sid global_sid_Builtin_Users =         /* Builtin users */
  72 { 1, 2, {0,0,0,0,0,5}, {32,545,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  73 const struct dom_sid global_sid_Builtin_Guests =                /* Builtin guest users */
  74 { 1, 2, {0,0,0,0,0,5}, {32,546,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  75 const struct dom_sid global_sid_Builtin_Power_Users =   /* Builtin power users */
  76 { 1, 2, {0,0,0,0,0,5}, {32,547,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  77 const struct dom_sid global_sid_Builtin_Account_Operators =     /* Builtin account operators */
  78 { 1, 2, {0,0,0,0,0,5}, {32,548,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  79 const struct dom_sid global_sid_Builtin_Server_Operators =      /* Builtin server operators */
  80 { 1, 2, {0,0,0,0,0,5}, {32,549,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  81 const struct dom_sid global_sid_Builtin_Print_Operators =       /* Builtin print operators */
  82 { 1, 2, {0,0,0,0,0,5}, {32,550,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  83 const struct dom_sid global_sid_Builtin_Backup_Operators =      /* Builtin backup operators */
  84 { 1, 2, {0,0,0,0,0,5}, {32,551,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  85 const struct dom_sid global_sid_Builtin_Replicator =            /* Builtin replicator */
  86 { 1, 2, {0,0,0,0,0,5}, {32,552,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  87 const struct dom_sid global_sid_Builtin_PreWin2kAccess =        /* Builtin pre win2k access */
  88 { 1, 2, {0,0,0,0,0,5}, {32,554,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  89
  90 const struct dom_sid global_sid_Unix_Users =                    /* Unmapped Unix users */
  91 { 1, 1, {0,0,0,0,0,22}, {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  92 const struct dom_sid global_sid_Unix_Groups =                   /* Unmapped Unix groups */
  93 { 1, 1, {0,0,0,0,0,22}, {2,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  94
  95 /* Unused, left here for documentary purposes */
  96 #if 0
  97 #define SECURITY_NULL_SID_AUTHORITY    0
  98 #define SECURITY_WORLD_SID_AUTHORITY   1
  99 #define SECURITY_LOCAL_SID_AUTHORITY   2
 100 #define SECURITY_CREATOR_SID_AUTHORITY 3
 101 #define SECURITY_NT_AUTHORITY          5
 102 #endif
 103
 104 static struct dom_sid system_sid_array[1] =
 105 { { 1, 1, {0,0,0,0,0,5}, {18,0,0,0,0,0,0,0,0,0,0,0,0,0,0}} };
 106 static const struct security_token system_token = {
 107         .num_sids       = ARRAY_SIZE(system_sid_array),
 108         .sids           = system_sid_array,
 109         .privilege_mask = SE_ALL_PRIVS
 110 };
 111
 112 /****************************************************************************
 113  Lookup string names for SID types.
 114 ****************************************************************************/
 115
 116 static const struct {
 117         enum lsa_SidType sid_type;
 118         const char *string;
 119 } sid_name_type[] = {
 120         {SID_NAME_USE_NONE, "None"},
 121         {SID_NAME_USER, "User"},
 122         {SID_NAME_DOM_GRP, "Domain Group"},
 123         {SID_NAME_DOMAIN, "Domain"},
 124         {SID_NAME_ALIAS, "Local Group"},
 125         {SID_NAME_WKN_GRP, "Well-known Group"},
 126         {SID_NAME_DELETED, "Deleted Account"},
 127         {SID_NAME_INVALID, "Invalid Account"},
 128         {SID_NAME_UNKNOWN, "UNKNOWN"},
 129         {SID_NAME_COMPUTER, "Computer"},
 130
 131         {(enum lsa_SidType)0, NULL}
 132 };
 133
 134 const char *sid_type_lookup(uint32_t sid_type)
 135 {
 136         int i = 0;
 137
 138         /* Look through list */
 139         while(sid_name_type[i].sid_type != 0) {
 140                 if (sid_name_type[i].sid_type == sid_type)
 141                         return sid_name_type[i].string;
 142                 i++;
 143         }
 144
 145         /* Default return */
 146         return "SID *TYPE* is INVALID";
 147 }
 148
 149 /**************************************************************************
 150  Create the SYSTEM token.
 151 ***************************************************************************/
 152
 153 const struct security_token *get_system_token(void)
 154 {
 155         return &system_token;
 156 }
 157
 158 bool sid_compose(struct dom_sid *dst, const struct dom_sid *domain_sid, uint32_t rid)
 159 {
 160         sid_copy(dst, domain_sid);
 161         return sid_append_rid(dst, rid);
 162 }
 163
 164 /*****************************************************************
 165  Removes the last rid from the end of a sid
 166 *****************************************************************/
 167
 168 bool sid_split_rid(struct dom_sid *sid, uint32_t *rid)
 169 {
 170         if (sid->num_auths > 0) {
 171                 sid->num_auths--;
 172                 *rid = sid->sub_auths[sid->num_auths];
 173                 return true;
 174         }
 175         return false;
 176 }
 177
 178 /*****************************************************************
 179  Return the last rid from the end of a sid
 180 *****************************************************************/
 181
 182 bool sid_peek_rid(const struct dom_sid *sid, uint32_t *rid)
 183 {
 184         if (!sid || !rid)
 185                 return false;
 186
 187         if (sid->num_auths > 0) {
 188                 *rid = sid->sub_auths[sid->num_auths - 1];
 189                 return true;
 190         }
 191         return false;
 192 }
 193
 194 /*****************************************************************
 195  Return the last rid from the end of a sid
 196  and check the sid against the exp_dom_sid
 197 *****************************************************************/
 198
 199 bool sid_peek_check_rid(const struct dom_sid *exp_dom_sid, const struct dom_sid *sid, uint32_t *rid)
 200 {
 201         if (!exp_dom_sid || !sid || !rid)
 202                 return false;
 203
 204         if (sid->num_auths != (exp_dom_sid->num_auths+1)) {
 205                 return false;
 206         }
 207
 208         if (sid_compare_domain(exp_dom_sid, sid)!=0){
 209                 *rid=(-1);
 210                 return false;
 211         }
 212
 213         return sid_peek_rid(sid, rid);
 214 }
 215
 216 /*****************************************************************
 217  Copies a sid
 218 *****************************************************************/
 219
 220 void sid_copy(struct dom_sid *dst, const struct dom_sid *src)
 221 {
 222         int i;
 223
 224         ZERO_STRUCTP(dst);
 225
 226         dst->sid_rev_num = src->sid_rev_num;
 227         dst->num_auths = src->num_auths;
 228
 229         memcpy(&dst->id_auth[0], &src->id_auth[0], sizeof(src->id_auth));
 230
 231         for (i = 0; i < src->num_auths; i++)
 232                 dst->sub_auths[i] = src->sub_auths[i];
 233 }
 234
 235 /*****************************************************************
 236  Parse a on-the-wire SID to a struct dom_sid.
 237 *****************************************************************/
 238
 239 bool sid_parse(const char *inbuf, size_t len, struct dom_sid *sid)
 240 {
 241         enum ndr_err_code ndr_err;
 242         DATA_BLOB in = data_blob_const(inbuf, len);
 243         ndr_err = ndr_pull_struct_blob_all(&in, NULL, sid,
 244                                            (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
 245         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 246                 return false;
 247         }
 248         return true;
 249 }
 250
 251 /*****************************************************************
 252  See if 2 SIDs are in the same domain
 253  this just compares the leading sub-auths
 254 *****************************************************************/
 255
 256 int sid_compare_domain(const struct dom_sid *sid1, const struct dom_sid *sid2)
 257 {
 258         int n, i;
 259
 260         n = MIN(sid1->num_auths, sid2->num_auths);
 261
 262         for (i = n-1; i >= 0; --i)
 263                 if (sid1->sub_auths[i] != sid2->sub_auths[i])
 264                         return sid1->sub_auths[i] - sid2->sub_auths[i];
 265
 266         return dom_sid_compare_auth(sid1, sid2);
 267 }
 268
 269 /*****************************************************************
 270  Compare two sids.
 271 *****************************************************************/
 272
 273 bool sid_equal(const struct dom_sid *sid1, const struct dom_sid *sid2)
 274 {
 275         return dom_sid_compare(sid1, sid2) == 0;
 276 }
 277
 278 /********************************************************************
 279  Add SID to an array SIDs
 280 ********************************************************************/
 281
 282 NTSTATUS add_sid_to_array(TALLOC_CTX *mem_ctx, const struct dom_sid *sid,
 283                           struct dom_sid **sids, uint32_t *num)
 284 {
 285         *sids = talloc_realloc(mem_ctx, *sids, struct dom_sid,
 286                                (*num)+1);
 287         if (*sids == NULL) {
 288                 *num = 0;
 289                 return NT_STATUS_NO_MEMORY;
 290         }
 291
 292         sid_copy(&((*sids)[*num]), sid);
 293         *num += 1;
 294
 295         return NT_STATUS_OK;
 296 }
 297
 298
 299 /********************************************************************
 300  Add SID to an array SIDs ensuring that it is not already there
 301 ********************************************************************/
 302
 303 NTSTATUS add_sid_to_array_unique(TALLOC_CTX *mem_ctx, const struct dom_sid *sid,
 304                                  struct dom_sid **sids, uint32_t *num_sids)
 305 {
 306         size_t i;
 307
 308         for (i=0; i<(*num_sids); i++) {
 309                 if (dom_sid_compare(sid, &(*sids)[i]) == 0)
 310                         return NT_STATUS_OK;
 311         }
 312
 313         return add_sid_to_array(mem_ctx, sid, sids, num_sids);
 314 }
 315
 316 /********************************************************************
 317  Remove SID from an array
 318 ********************************************************************/
 319
 320 void del_sid_from_array(const struct dom_sid *sid, struct dom_sid **sids, size_t *num)
 321 {
 322         struct dom_sid *sid_list = *sids;
 323         size_t i;
 324
 325         for ( i=0; i<*num; i++ ) {
 326
 327                 /* if we find the SID, then decrement the count
 328                    and break out of the loop */
 329
 330                 if ( sid_equal(sid, &sid_list[i]) ) {
 331                         *num -= 1;
 332                         break;
 333                 }
 334         }
 335
 336         /* This loop will copy the remainder of the array
 337            if i < num of sids ni the array */
 338
 339         for ( ; i<*num; i++ )
 340                 sid_copy( &sid_list[i], &sid_list[i+1] );
 341
 342         return;
 343 }
 344
 345 bool add_rid_to_array_unique(TALLOC_CTX *mem_ctx,
 346                              uint32_t rid, uint32_t **pp_rids, size_t *p_num)
 347 {
 348         size_t i;
 349
 350         for (i=0; i<*p_num; i++) {
 351                 if ((*pp_rids)[i] == rid)
 352                         return true;
 353         }
 354
 355         *pp_rids = talloc_realloc(mem_ctx, *pp_rids, uint32_t, *p_num+1);
 356
 357         if (*pp_rids == NULL) {
 358                 *p_num = 0;
 359                 return false;
 360         }
 361
 362         (*pp_rids)[*p_num] = rid;
 363         *p_num += 1;
 364         return true;
 365 }
 366
 367 bool is_null_sid(const struct dom_sid *sid)
 368 {
 369         static const struct dom_sid null_sid = {0};
 370         return sid_equal(sid, &null_sid);
 371 }