libcli/security/dom_sid.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba utility functions
   4
   5    Copyright (C) Stefan (metze) Metzmacher      2002-2004
   6    Copyright (C) Andrew Tridgell                1992-2004
   7    Copyright (C) Jeremy Allison                 1999
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "librpc/gen_ndr/security.h"
  25 #include "dom_sid.h"
  26
  27 /*****************************************************************
  28  Compare the auth portion of two sids.
  29 *****************************************************************/
  30
  31 static int dom_sid_compare_auth(const struct dom_sid *sid1,
  32                                 const struct dom_sid *sid2)
  33 {
  34         int i;
  35
  36         if (sid1 == sid2)
  37                 return 0;
  38         if (!sid1)
  39                 return -1;
  40         if (!sid2)
  41                 return 1;
  42
  43         if (sid1->sid_rev_num != sid2->sid_rev_num)
  44                 return sid1->sid_rev_num - sid2->sid_rev_num;
  45
  46         for (i = 0; i < 6; i++)
  47                 if (sid1->id_auth[i] != sid2->id_auth[i])
  48                         return sid1->id_auth[i] - sid2->id_auth[i];
  49
  50         return 0;
  51 }
  52
  53 /*****************************************************************
  54  Compare two sids.
  55 *****************************************************************/
  56
  57 int dom_sid_compare(const struct dom_sid *sid1, const struct dom_sid *sid2)
  58 {
  59         int i;
  60
  61         if (sid1 == sid2)
  62                 return 0;
  63         if (!sid1)
  64                 return -1;
  65         if (!sid2)
  66                 return 1;
  67
  68         /* Compare most likely different rids, first: i.e start at end */
  69         if (sid1->num_auths != sid2->num_auths)
  70                 return sid1->num_auths - sid2->num_auths;
  71
  72         for (i = sid1->num_auths-1; i >= 0; --i)
  73                 if (sid1->sub_auths[i] != sid2->sub_auths[i])
  74                         return sid1->sub_auths[i] - sid2->sub_auths[i];
  75
  76         return dom_sid_compare_auth(sid1, sid2);
  77 }
  78
  79 /*****************************************************************
  80  Compare two sids.
  81 *****************************************************************/
  82
  83 bool dom_sid_equal(const struct dom_sid *sid1, const struct dom_sid *sid2)
  84 {
  85         return dom_sid_compare(sid1, sid2) == 0;
  86 }
  87
  88 /*****************************************************************
  89  Add a rid to the end of a sid
  90 *****************************************************************/
  91
  92 bool sid_append_rid(struct dom_sid *sid, uint32_t rid)
  93 {
  94         if (sid->num_auths < ARRAY_SIZE(sid->sub_auths)) {
  95                 sid->sub_auths[sid->num_auths++] = rid;
  96                 return true;
  97         }
  98         return false;
  99 }
 100
 101 /*****************************************************************
 102  Convert a string to a SID. Returns True on success, False on fail.
 103 *****************************************************************/
 104
 105 bool string_to_sid(struct dom_sid *sidout, const char *sidstr)
 106 {
 107         const char *p;
 108         char *q;
 109         /* BIG NOTE: this function only does SIDS where the identauth is not >= 2^32 */
 110         uint32_t conv;
 111
 112         ZERO_STRUCTP(sidout);
 113
 114         if ((sidstr[0] != 'S' && sidstr[0] != 's') || sidstr[1] != '-') {
 115                 goto format_error;
 116         }
 117
 118         /* Get the revision number. */
 119         p = sidstr + 2;
 120
 121         if (!isdigit(*p)) {
 122                 goto format_error;
 123         }
 124
 125         conv = (uint32_t) strtoul(p, &q, 10);
 126         if (!q || (*q != '-')) {
 127                 goto format_error;
 128         }
 129         sidout->sid_rev_num = (uint8_t) conv;
 130         q++;
 131
 132         if (!isdigit(*q)) {
 133                 goto format_error;
 134         }
 135
 136         /* get identauth */
 137         conv = (uint32_t) strtoul(q, &q, 10);
 138         if (!q) {
 139                 goto format_error;
 140         }
 141
 142         /* identauth in decimal should be <  2^32 */
 143         /* NOTE - the conv value is in big-endian format. */
 144         sidout->id_auth[0] = 0;
 145         sidout->id_auth[1] = 0;
 146         sidout->id_auth[2] = (conv & 0xff000000) >> 24;
 147         sidout->id_auth[3] = (conv & 0x00ff0000) >> 16;
 148         sidout->id_auth[4] = (conv & 0x0000ff00) >> 8;
 149         sidout->id_auth[5] = (conv & 0x000000ff);
 150
 151         sidout->num_auths = 0;
 152         if (*q != '-') {
 153                 /* Just id_auth, no subauths */
 154                 return true;
 155         }
 156
 157         q++;
 158
 159         while (true) {
 160                 char *end;
 161
 162                 if (!isdigit(*q)) {
 163                         goto format_error;
 164                 }
 165
 166                 conv = strtoul(q, &end, 10);
 167                 if (end == q) {
 168                         goto format_error;
 169                 }
 170
 171                 if (!sid_append_rid(sidout, conv)) {
 172                         DEBUG(3, ("Too many sid auths in %s\n", sidstr));
 173                         return false;
 174                 }
 175
 176                 q = end;
 177                 if (*q != '-') {
 178                         break;
 179                 }
 180                 q += 1;
 181         }
 182         return true;
 183
 184 format_error:
 185         DEBUG(3, ("string_to_sid: SID %s is not in a valid format\n", sidstr));
 186         return false;
 187 }
 188
 189 bool dom_sid_parse(const char *sidstr, struct dom_sid *ret)
 190 {
 191         return string_to_sid(ret, sidstr);
 192 }
 193
 194 /*
 195   convert a string to a dom_sid, returning a talloc'd dom_sid
 196 */
 197 struct dom_sid *dom_sid_parse_talloc(TALLOC_CTX *mem_ctx, const char *sidstr)
 198 {
 199         struct dom_sid *ret;
 200         ret = talloc(mem_ctx, struct dom_sid);
 201         if (!ret) {
 202                 return NULL;
 203         }
 204         if (!dom_sid_parse(sidstr, ret)) {
 205                 talloc_free(ret);
 206                 return NULL;
 207         }
 208
 209         return ret;
 210 }
 211
 212 /*
 213   convert a string to a dom_sid, returning a talloc'd dom_sid
 214 */
 215 struct dom_sid *dom_sid_parse_length(TALLOC_CTX *mem_ctx, const DATA_BLOB *sid)
 216 {
 217         struct dom_sid *ret;
 218         char *p = talloc_strndup(mem_ctx, (char *)sid->data, sid->length);
 219         if (!p) {
 220                 return NULL;
 221         }
 222         ret = dom_sid_parse_talloc(mem_ctx, p);
 223         talloc_free(p);
 224         return ret;
 225 }
 226
 227 /*
 228   copy a dom_sid structure
 229 */
 230 struct dom_sid *dom_sid_dup(TALLOC_CTX *mem_ctx, const struct dom_sid *dom_sid)
 231 {
 232         struct dom_sid *ret;
 233         int i;
 234
 235         if (!dom_sid) {
 236                 return NULL;
 237         }
 238
 239         ret = talloc(mem_ctx, struct dom_sid);
 240         if (!ret) {
 241                 return NULL;
 242         }
 243
 244         ret->sid_rev_num = dom_sid->sid_rev_num;
 245         ret->id_auth[0] = dom_sid->id_auth[0];
 246         ret->id_auth[1] = dom_sid->id_auth[1];
 247         ret->id_auth[2] = dom_sid->id_auth[2];
 248         ret->id_auth[3] = dom_sid->id_auth[3];
 249         ret->id_auth[4] = dom_sid->id_auth[4];
 250         ret->id_auth[5] = dom_sid->id_auth[5];
 251         ret->num_auths = dom_sid->num_auths;
 252
 253         for (i=0;i<dom_sid->num_auths;i++) {
 254                 ret->sub_auths[i] = dom_sid->sub_auths[i];
 255         }
 256
 257         return ret;
 258 }
 259
 260 /*
 261   add a rid to a domain dom_sid to make a full dom_sid. This function
 262   returns a new sid in the supplied memory context
 263 */
 264 struct dom_sid *dom_sid_add_rid(TALLOC_CTX *mem_ctx,
 265                                 const struct dom_sid *domain_sid,
 266                                 uint32_t rid)
 267 {
 268         struct dom_sid *sid;
 269
 270         sid = dom_sid_dup(mem_ctx, domain_sid);
 271         if (!sid) return NULL;
 272
 273         if (!sid_append_rid(sid, rid)) {
 274                 talloc_free(sid);
 275                 return NULL;
 276         }
 277
 278         return sid;
 279 }
 280
 281 /*
 282   Split up a SID into its domain and RID part
 283 */
 284 NTSTATUS dom_sid_split_rid(TALLOC_CTX *mem_ctx, const struct dom_sid *sid,
 285                            struct dom_sid **domain, uint32_t *rid)
 286 {
 287         if (sid->num_auths == 0) {
 288                 return NT_STATUS_INVALID_PARAMETER;
 289         }
 290
 291         if (domain) {
 292                 if (!(*domain = dom_sid_dup(mem_ctx, sid))) {
 293                         return NT_STATUS_NO_MEMORY;
 294                 }
 295
 296                 (*domain)->num_auths -= 1;
 297         }
 298
 299         if (rid) {
 300                 *rid = sid->sub_auths[sid->num_auths - 1];
 301         }
 302
 303         return NT_STATUS_OK;
 304 }
 305
 306 /*
 307   return true if the 2nd sid is in the domain given by the first sid
 308 */
 309 bool dom_sid_in_domain(const struct dom_sid *domain_sid,
 310                        const struct dom_sid *sid)
 311 {
 312         int i;
 313
 314         if (!domain_sid || !sid) {
 315                 return false;
 316         }
 317
 318         if (domain_sid->num_auths > sid->num_auths) {
 319                 return false;
 320         }
 321
 322         for (i = domain_sid->num_auths-1; i >= 0; --i) {
 323                 if (domain_sid->sub_auths[i] != sid->sub_auths[i]) {
 324                         return false;
 325                 }
 326         }
 327
 328         return dom_sid_compare_auth(domain_sid, sid) == 0;
 329 }
 330
 331 /*
 332   convert a dom_sid to a string
 333 */
 334 char *dom_sid_string(TALLOC_CTX *mem_ctx, const struct dom_sid *sid)
 335 {
 336         int i, ofs, maxlen;
 337         uint32_t ia;
 338         char *ret;
 339
 340         if (!sid) {
 341                 return talloc_strdup(mem_ctx, "(NULL SID)");
 342         }
 343
 344         maxlen = sid->num_auths * 11 + 25;
 345         ret = talloc_array(mem_ctx, char, maxlen);
 346         if (!ret) return talloc_strdup(mem_ctx, "(SID ERR)");
 347
 348         ia = (sid->id_auth[5]) +
 349                 (sid->id_auth[4] << 8 ) +
 350                 (sid->id_auth[3] << 16) +
 351                 (sid->id_auth[2] << 24);
 352
 353         ofs = snprintf(ret, maxlen, "S-%u-%lu",
 354                        (unsigned int)sid->sid_rev_num, (unsigned long)ia);
 355
 356         for (i = 0; i < sid->num_auths; i++) {
 357                 ofs += snprintf(ret + ofs, maxlen - ofs, "-%lu",
 358                                 (unsigned long)sid->sub_auths[i]);
 359         }
 360
 361         return ret;
 362 }