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 #define AUTHORITY_MASK (~(0xffffffffffffULL))
 124
 125 bool dom_sid_parse_endp(const char *sidstr,struct dom_sid *sidout,
 126                         const char **endp)
 127 {
 128         const char *p;
 129         char *q;
 130         /* BIG NOTE: this function only does SIDS where the identauth is not >= 2^32 */
 131         uint64_t conv;
 132
 133         ZERO_STRUCTP(sidout);
 134
 135         if ((sidstr[0] != 'S' && sidstr[0] != 's') || sidstr[1] != '-') {
 136                 goto format_error;
 137         }
 138
 139         /* Get the revision number. */
 140         p = sidstr + 2;
 141
 142         if (!isdigit(*p)) {
 143                 goto format_error;
 144         }
 145
 146         conv = strtoul(p, &q, 10);
 147         if (!q || (*q != '-') || conv > UINT8_MAX) {
 148                 goto format_error;
 149         }
 150         sidout->sid_rev_num = (uint8_t) conv;
 151         q++;
 152
 153         if (!isdigit(*q)) {
 154                 goto format_error;
 155         }
 156
 157         /* get identauth */
 158         conv = strtoull(q, &q, 0);
 159         if (!q || conv & AUTHORITY_MASK) {
 160                 goto format_error;
 161         }
 162
 163         /* When identauth >= UINT32_MAX, it's in hex with a leading 0x */
 164         /* NOTE - the conv value is in big-endian format. */
 165         sidout->id_auth[0] = (conv & 0xff0000000000ULL) >> 40;
 166         sidout->id_auth[1] = (conv & 0x00ff00000000ULL) >> 32;
 167         sidout->id_auth[2] = (conv & 0x0000ff000000ULL) >> 24;
 168         sidout->id_auth[3] = (conv & 0x000000ff0000ULL) >> 16;
 169         sidout->id_auth[4] = (conv & 0x00000000ff00ULL) >> 8;
 170         sidout->id_auth[5] = (conv & 0x0000000000ffULL);
 171
 172         sidout->num_auths = 0;
 173         if (*q != '-') {
 174                 /* Just id_auth, no subauths */
 175                 return true;
 176         }
 177
 178         q++;
 179
 180         while (true) {
 181                 char *end;
 182
 183                 if (!isdigit(*q)) {
 184                         goto format_error;
 185                 }
 186
 187                 conv = strtoull(q, &end, 10);
 188                 if (end == q || conv > UINT32_MAX) {
 189                         goto format_error;
 190                 }
 191
 192                 if (!sid_append_rid(sidout, conv)) {
 193                         DEBUG(3, ("Too many sid auths in %s\n", sidstr));
 194                         return false;
 195                 }
 196
 197                 q = end;
 198                 if (*q != '-') {
 199                         break;
 200                 }
 201                 q += 1;
 202         }
 203         if (endp != NULL) {
 204                 *endp = q;
 205         }
 206         return true;
 207
 208 format_error:
 209         DEBUG(3, ("string_to_sid: SID %s is not in a valid format\n", sidstr));
 210         return false;
 211 }
 212
 213 bool string_to_sid(struct dom_sid *sidout, const char *sidstr)
 214 {
 215         return dom_sid_parse(sidstr, sidout);
 216 }
 217
 218 bool dom_sid_parse(const char *sidstr, struct dom_sid *ret)
 219 {
 220         return dom_sid_parse_endp(sidstr, ret, NULL);
 221 }
 222
 223 /*
 224   convert a string to a dom_sid, returning a talloc'd dom_sid
 225 */
 226 struct dom_sid *dom_sid_parse_talloc(TALLOC_CTX *mem_ctx, const char *sidstr)
 227 {
 228         struct dom_sid *ret;
 229         ret = talloc(mem_ctx, struct dom_sid);
 230         if (!ret) {
 231                 return NULL;
 232         }
 233         if (!dom_sid_parse(sidstr, ret)) {
 234                 talloc_free(ret);
 235                 return NULL;
 236         }
 237
 238         return ret;
 239 }
 240
 241 /*
 242   convert a string to a dom_sid, returning a talloc'd dom_sid
 243 */
 244 struct dom_sid *dom_sid_parse_length(TALLOC_CTX *mem_ctx, const DATA_BLOB *sid)
 245 {
 246         struct dom_sid *ret;
 247         char *p = talloc_strndup(mem_ctx, (char *)sid->data, sid->length);
 248         if (!p) {
 249                 return NULL;
 250         }
 251         ret = dom_sid_parse_talloc(mem_ctx, p);
 252         talloc_free(p);
 253         return ret;
 254 }
 255
 256 /*
 257   copy a dom_sid structure
 258 */
 259 struct dom_sid *dom_sid_dup(TALLOC_CTX *mem_ctx, const struct dom_sid *dom_sid)
 260 {
 261         struct dom_sid *ret;
 262         int i;
 263
 264         if (!dom_sid) {
 265                 return NULL;
 266         }
 267
 268         ret = talloc(mem_ctx, struct dom_sid);
 269         if (!ret) {
 270                 return NULL;
 271         }
 272
 273         ret->sid_rev_num = dom_sid->sid_rev_num;
 274         ret->id_auth[0] = dom_sid->id_auth[0];
 275         ret->id_auth[1] = dom_sid->id_auth[1];
 276         ret->id_auth[2] = dom_sid->id_auth[2];
 277         ret->id_auth[3] = dom_sid->id_auth[3];
 278         ret->id_auth[4] = dom_sid->id_auth[4];
 279         ret->id_auth[5] = dom_sid->id_auth[5];
 280         ret->num_auths = dom_sid->num_auths;
 281
 282         for (i=0;i<dom_sid->num_auths;i++) {
 283                 ret->sub_auths[i] = dom_sid->sub_auths[i];
 284         }
 285
 286         return ret;
 287 }
 288
 289 /*
 290   add a rid to a domain dom_sid to make a full dom_sid. This function
 291   returns a new sid in the supplied memory context
 292 */
 293 struct dom_sid *dom_sid_add_rid(TALLOC_CTX *mem_ctx,
 294                                 const struct dom_sid *domain_sid,
 295                                 uint32_t rid)
 296 {
 297         struct dom_sid *sid;
 298
 299         sid = dom_sid_dup(mem_ctx, domain_sid);
 300         if (!sid) return NULL;
 301
 302         if (!sid_append_rid(sid, rid)) {
 303                 talloc_free(sid);
 304                 return NULL;
 305         }
 306
 307         return sid;
 308 }
 309
 310 /*
 311   Split up a SID into its domain and RID part
 312 */
 313 NTSTATUS dom_sid_split_rid(TALLOC_CTX *mem_ctx, const struct dom_sid *sid,
 314                            struct dom_sid **domain, uint32_t *rid)
 315 {
 316         if (sid->num_auths == 0) {
 317                 return NT_STATUS_INVALID_PARAMETER;
 318         }
 319
 320         if (domain) {
 321                 if (!(*domain = dom_sid_dup(mem_ctx, sid))) {
 322                         return NT_STATUS_NO_MEMORY;
 323                 }
 324
 325                 (*domain)->num_auths -= 1;
 326         }
 327
 328         if (rid) {
 329                 *rid = sid->sub_auths[sid->num_auths - 1];
 330         }
 331
 332         return NT_STATUS_OK;
 333 }
 334
 335 /*
 336   return true if the 2nd sid is in the domain given by the first sid
 337 */
 338 bool dom_sid_in_domain(const struct dom_sid *domain_sid,
 339                        const struct dom_sid *sid)
 340 {
 341         int i;
 342
 343         if (!domain_sid || !sid) {
 344                 return false;
 345         }
 346
 347         if (domain_sid->num_auths > sid->num_auths) {
 348                 return false;
 349         }
 350
 351         for (i = domain_sid->num_auths-1; i >= 0; --i) {
 352                 if (domain_sid->sub_auths[i] != sid->sub_auths[i]) {
 353                         return false;
 354                 }
 355         }
 356
 357         return dom_sid_compare_auth(domain_sid, sid) == 0;
 358 }
 359
 360 /*
 361   Convert a dom_sid to a string, printing into a buffer. Return the
 362   string length. If it overflows, return the string length that would
 363   result (buflen needs to be +1 for the terminating 0).
 364 */
 365 int dom_sid_string_buf(const struct dom_sid *sid, char *buf, int buflen)
 366 {
 367         int i, ofs;
 368         uint64_t ia;
 369
 370         if (!sid) {
 371                 return strlcpy(buf, "(NULL SID)", buflen);
 372         }
 373
 374         ia = ((uint64_t)sid->id_auth[5]) +
 375                 ((uint64_t)sid->id_auth[4] << 8 ) +
 376                 ((uint64_t)sid->id_auth[3] << 16) +
 377                 ((uint64_t)sid->id_auth[2] << 24) +
 378                 ((uint64_t)sid->id_auth[1] << 32) +
 379                 ((uint64_t)sid->id_auth[0] << 40);
 380
 381         ofs = snprintf(buf, buflen, "S-%hhu-", (unsigned char)sid->sid_rev_num);
 382         if (ia >= UINT32_MAX) {
 383                 ofs += snprintf(buf + ofs, MAX(buflen - ofs, 0), "0x%llx",
 384                                 (unsigned long long)ia);
 385         } else {
 386                 ofs += snprintf(buf + ofs, MAX(buflen - ofs, 0), "%llu",
 387                                 (unsigned long long)ia);
 388         }
 389
 390         for (i = 0; i < sid->num_auths; i++) {
 391                 ofs += snprintf(buf + ofs, MAX(buflen - ofs, 0), "-%u",
 392                                 (unsigned int)sid->sub_auths[i]);
 393         }
 394         return ofs;
 395 }
 396
 397 /*
 398   convert a dom_sid to a string
 399 */
 400 char *dom_sid_string(TALLOC_CTX *mem_ctx, const struct dom_sid *sid)
 401 {
 402         char buf[DOM_SID_STR_BUFLEN];
 403         char *result;
 404         int len;
 405
 406         len = dom_sid_string_buf(sid, buf, sizeof(buf));
 407
 408         if (len+1 > sizeof(buf)) {
 409                 return talloc_strdup(mem_ctx, "(SID ERR)");
 410         }
 411
 412         /*
 413          * Avoid calling strlen (via talloc_strdup), we already have
 414          * the length
 415          */
 416         result = (char *)talloc_memdup(mem_ctx, buf, len+1);
 417         if (result == NULL) {
 418                 return NULL;
 419         }
 420
 421         /*
 422          * beautify the talloc_report output
 423          */
 424         talloc_set_name_const(result, result);
 425         return result;
 426 }