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 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   See if 2 SIDs are in the same domain
 103   this just compares the leading sub-auths
 104 */
 105 int dom_sid_compare_domain(const struct dom_sid *sid1,
 106                            const struct dom_sid *sid2)
 107 {
 108         int n, i;
 109
 110         n = MIN(sid1->num_auths, sid2->num_auths);
 111
 112         for (i = n-1; i >= 0; --i)
 113                 if (sid1->sub_auths[i] != sid2->sub_auths[i])
 114                         return sid1->sub_auths[i] - sid2->sub_auths[i];
 115
 116         return dom_sid_compare_auth(sid1, sid2);
 117 }
 118
 119 /*****************************************************************
 120  Convert a string to a SID. Returns True on success, False on fail.
 121  Return the first character not parsed in endp.
 122 *****************************************************************/
 123
 124 bool dom_sid_parse_endp(const char *sidstr,struct dom_sid *sidout,
 125                         const char **endp)
 126 {
 127         const char *p;
 128         char *q;
 129         /* BIG NOTE: this function only does SIDS where the identauth is not >= 2^32 */
 130         uint32_t conv;
 131
 132         ZERO_STRUCTP(sidout);
 133
 134         if ((sidstr[0] != 'S' && sidstr[0] != 's') || sidstr[1] != '-') {
 135                 goto format_error;
 136         }
 137
 138         /* Get the revision number. */
 139         p = sidstr + 2;
 140
 141         if (!isdigit(*p)) {
 142                 goto format_error;
 143         }
 144
 145         conv = (uint32_t) strtoul(p, &q, 10);
 146         if (!q || (*q != '-')) {
 147                 goto format_error;
 148         }
 149         sidout->sid_rev_num = (uint8_t) conv;
 150         q++;
 151
 152         if (!isdigit(*q)) {
 153                 goto format_error;
 154         }
 155
 156         /* get identauth */
 157         conv = (uint32_t) strtoul(q, &q, 10);
 158         if (!q) {
 159                 goto format_error;
 160         }
 161
 162         /* identauth in decimal should be <  2^32 */
 163         /* NOTE - the conv value is in big-endian format. */
 164         sidout->id_auth[0] = 0;
 165         sidout->id_auth[1] = 0;
 166         sidout->id_auth[2] = (conv & 0xff000000) >> 24;
 167         sidout->id_auth[3] = (conv & 0x00ff0000) >> 16;
 168         sidout->id_auth[4] = (conv & 0x0000ff00) >> 8;
 169         sidout->id_auth[5] = (conv & 0x000000ff);
 170
 171         sidout->num_auths = 0;
 172         if (*q != '-') {
 173                 /* Just id_auth, no subauths */
 174                 return true;
 175         }
 176
 177         q++;
 178
 179         while (true) {
 180                 char *end;
 181
 182                 if (!isdigit(*q)) {
 183                         goto format_error;
 184                 }
 185
 186                 conv = strtoul(q, &end, 10);
 187                 if (end == q) {
 188                         goto format_error;
 189                 }
 190
 191                 if (!sid_append_rid(sidout, conv)) {
 192                         DEBUG(3, ("Too many sid auths in %s\n", sidstr));
 193                         return false;
 194                 }
 195
 196                 q = end;
 197                 if (*q != '-') {
 198                         break;
 199                 }
 200                 q += 1;
 201         }
 202         if (endp != NULL) {
 203                 *endp = q;
 204         }
 205         return true;
 206
 207 format_error:
 208         DEBUG(3, ("string_to_sid: SID %s is not in a valid format\n", sidstr));
 209         return false;
 210 }
 211
 212 bool string_to_sid(struct dom_sid *sidout, const char *sidstr)
 213 {
 214         return dom_sid_parse(sidstr, sidout);
 215 }
 216
 217 bool dom_sid_parse(const char *sidstr, struct dom_sid *ret)
 218 {
 219         return dom_sid_parse_endp(sidstr, ret, NULL);
 220 }
 221
 222 /*
 223   convert a string to a dom_sid, returning a talloc'd dom_sid
 224 */
 225 struct dom_sid *dom_sid_parse_talloc(TALLOC_CTX *mem_ctx, const char *sidstr)
 226 {
 227         struct dom_sid *ret;
 228         ret = talloc(mem_ctx, struct dom_sid);
 229         if (!ret) {
 230                 return NULL;
 231         }
 232         if (!dom_sid_parse(sidstr, ret)) {
 233                 talloc_free(ret);
 234                 return NULL;
 235         }
 236
 237         return ret;
 238 }
 239
 240 /*
 241   convert a string to a dom_sid, returning a talloc'd dom_sid
 242 */
 243 struct dom_sid *dom_sid_parse_length(TALLOC_CTX *mem_ctx, const DATA_BLOB *sid)
 244 {
 245         struct dom_sid *ret;
 246         char *p = talloc_strndup(mem_ctx, (char *)sid->data, sid->length);
 247         if (!p) {
 248                 return NULL;
 249         }
 250         ret = dom_sid_parse_talloc(mem_ctx, p);
 251         talloc_free(p);
 252         return ret;
 253 }
 254
 255 /*
 256   copy a dom_sid structure
 257 */
 258 struct dom_sid *dom_sid_dup(TALLOC_CTX *mem_ctx, const struct dom_sid *dom_sid)
 259 {
 260         struct dom_sid *ret;
 261         int i;
 262
 263         if (!dom_sid) {
 264                 return NULL;
 265         }
 266
 267         ret = talloc(mem_ctx, struct dom_sid);
 268         if (!ret) {
 269                 return NULL;
 270         }
 271
 272         ret->sid_rev_num = dom_sid->sid_rev_num;
 273         ret->id_auth[0] = dom_sid->id_auth[0];
 274         ret->id_auth[1] = dom_sid->id_auth[1];
 275         ret->id_auth[2] = dom_sid->id_auth[2];
 276         ret->id_auth[3] = dom_sid->id_auth[3];
 277         ret->id_auth[4] = dom_sid->id_auth[4];
 278         ret->id_auth[5] = dom_sid->id_auth[5];
 279         ret->num_auths = dom_sid->num_auths;
 280
 281         for (i=0;i<dom_sid->num_auths;i++) {
 282                 ret->sub_auths[i] = dom_sid->sub_auths[i];
 283         }
 284
 285         return ret;
 286 }
 287
 288 /*
 289   add a rid to a domain dom_sid to make a full dom_sid. This function
 290   returns a new sid in the supplied memory context
 291 */
 292 struct dom_sid *dom_sid_add_rid(TALLOC_CTX *mem_ctx,
 293                                 const struct dom_sid *domain_sid,
 294                                 uint32_t rid)
 295 {
 296         struct dom_sid *sid;
 297
 298         sid = dom_sid_dup(mem_ctx, domain_sid);
 299         if (!sid) return NULL;
 300
 301         if (!sid_append_rid(sid, rid)) {
 302                 talloc_free(sid);
 303                 return NULL;
 304         }
 305
 306         return sid;
 307 }
 308
 309 /*
 310   Split up a SID into its domain and RID part
 311 */
 312 NTSTATUS dom_sid_split_rid(TALLOC_CTX *mem_ctx, const struct dom_sid *sid,
 313                            struct dom_sid **domain, uint32_t *rid)
 314 {
 315         if (sid->num_auths == 0) {
 316                 return NT_STATUS_INVALID_PARAMETER;
 317         }
 318
 319         if (domain) {
 320                 if (!(*domain = dom_sid_dup(mem_ctx, sid))) {
 321                         return NT_STATUS_NO_MEMORY;
 322                 }
 323
 324                 (*domain)->num_auths -= 1;
 325         }
 326
 327         if (rid) {
 328                 *rid = sid->sub_auths[sid->num_auths - 1];
 329         }
 330
 331         return NT_STATUS_OK;
 332 }
 333
 334 /*
 335   return true if the 2nd sid is in the domain given by the first sid
 336 */
 337 bool dom_sid_in_domain(const struct dom_sid *domain_sid,
 338                        const struct dom_sid *sid)
 339 {
 340         int i;
 341
 342         if (!domain_sid || !sid) {
 343                 return false;
 344         }
 345
 346         if (domain_sid->num_auths > sid->num_auths) {
 347                 return false;
 348         }
 349
 350         for (i = domain_sid->num_auths-1; i >= 0; --i) {
 351                 if (domain_sid->sub_auths[i] != sid->sub_auths[i]) {
 352                         return false;
 353                 }
 354         }
 355
 356         return dom_sid_compare_auth(domain_sid, sid) == 0;
 357 }
 358
 359 /*
 360   Convert a dom_sid to a string, printing into a buffer. Return the
 361   string length. If it overflows, return the string length that would
 362   result (buflen needs to be +1 for the terminating 0).
 363 */
 364 int dom_sid_string_buf(const struct dom_sid *sid, char *buf, int buflen)
 365 {
 366         int i, ofs;
 367         uint32_t ia;
 368
 369         if (!sid) {
 370                 return strlcpy(buf, "(NULL SID)", buflen);
 371         }
 372
 373         ia = (sid->id_auth[5]) +
 374                 (sid->id_auth[4] << 8 ) +
 375                 (sid->id_auth[3] << 16) +
 376                 (sid->id_auth[2] << 24);
 377
 378         ofs = snprintf(buf, buflen, "S-%u-%lu",
 379                        (unsigned int)sid->sid_rev_num, (unsigned long)ia);
 380
 381         for (i = 0; i < sid->num_auths; i++) {
 382                 ofs += snprintf(buf + ofs, MAX(buflen - ofs, 0), "-%lu",
 383                                 (unsigned long)sid->sub_auths[i]);
 384         }
 385         return ofs;
 386 }
 387
 388 /*
 389   convert a dom_sid to a string
 390 */
 391 char *dom_sid_string(TALLOC_CTX *mem_ctx, const struct dom_sid *sid)
 392 {
 393         char buf[DOM_SID_STR_BUFLEN];
 394         char *result;
 395         int len;
 396
 397         len = dom_sid_string_buf(sid, buf, sizeof(buf));
 398
 399         if (len+1 > sizeof(buf)) {
 400                 return talloc_strdup(mem_ctx, "(SID ERR)");
 401         }
 402
 403         /*
 404          * Avoid calling strlen (via talloc_strdup), we already have
 405          * the length
 406          */
 407         result = (char *)talloc_memdup(mem_ctx, buf, len+1);
 408
 409         /*
 410          * beautify the talloc_report output
 411          */
 412         talloc_set_name_const(result, result);
 413         return result;
 414 }