source3/utils/sharesec.c

   1 /*
   2  *  Unix SMB/Netbios implementation.
   3  *  Utility for managing share permissions
   4  *
   5  *  Copyright (C) Tim Potter                    2000
   6  *  Copyright (C) Jeremy Allison                2000
   7  *  Copyright (C) Jelmer Vernooij               2003
   8  *  Copyright (C) Gerald (Jerry) Carter         2005.
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 3 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 struct cli_state;
  25
  26 #include "includes.h"
  27 #include "popt_common.h"
  28 #include "../libcli/security/security.h"
  29 #include "passdb/machine_sid.h"
  30 #include "util_sd.h"
  31 #include "cmdline_contexts.h"
  32
  33 static TALLOC_CTX *ctx;
  34
  35 enum acl_mode { SMB_ACL_DELETE,
  36                 SMB_ACL_MODIFY,
  37                 SMB_ACL_ADD,
  38                 SMB_ACL_SET,
  39                 SMB_SD_DELETE,
  40                 SMB_SD_SETSDDL,
  41                 SMB_SD_VIEWSDDL,
  42                 SMB_ACL_VIEW,
  43                 SMB_ACL_VIEW_ALL };
  44
  45 /********************************************************************
  46 ********************************************************************/
  47
  48 static struct security_descriptor* parse_acl_string(TALLOC_CTX *mem_ctx, const char *szACL, size_t *sd_size )
  49 {
  50         struct security_descriptor *sd = NULL;
  51         struct security_ace *ace;
  52         struct security_acl *theacl;
  53         int num_ace;
  54         const char *pacl;
  55         int i;
  56
  57         if ( !szACL )
  58                 return NULL;
  59
  60         pacl = szACL;
  61         num_ace = count_chars( pacl, ',' ) + 1;
  62
  63         if ( !(ace = talloc_zero_array( mem_ctx, struct security_ace, num_ace )) )
  64                 return NULL;
  65
  66         for ( i=0; i<num_ace; i++ ) {
  67                 char *end_acl = strchr_m( pacl, ',' );
  68                 fstring acl_string;
  69
  70                 strncpy( acl_string, pacl, MIN( PTR_DIFF( end_acl, pacl ), sizeof(fstring)-1) );
  71                 acl_string[MIN( PTR_DIFF( end_acl, pacl ), sizeof(fstring)-1)] = '\0';
  72
  73                 if ( !parse_ace(NULL, &ace[i], acl_string ) )
  74                         return NULL;
  75
  76                 pacl = end_acl;
  77                 pacl++;
  78         }
  79
  80         if ( !(theacl = make_sec_acl( mem_ctx, NT4_ACL_REVISION, num_ace, ace )) )
  81                 return NULL;
  82
  83         sd = make_sec_desc( mem_ctx, SD_REVISION, SEC_DESC_SELF_RELATIVE,
  84                 NULL, NULL, NULL, theacl, sd_size);
  85
  86         return sd;
  87 }
  88
  89 /* add an ACE to a list of ACEs in a struct security_acl */
  90 static bool add_ace(TALLOC_CTX *mem_ctx, struct security_acl **the_acl, struct security_ace *ace)
  91 {
  92         struct security_acl *new_ace;
  93         struct security_ace *aces;
  94         if (! *the_acl) {
  95                 return (((*the_acl) = make_sec_acl(mem_ctx, 3, 1, ace)) != NULL);
  96         }
  97
  98         if (!(aces = SMB_CALLOC_ARRAY(struct security_ace, 1+(*the_acl)->num_aces))) {
  99                 return False;
 100         }
 101         memcpy(aces, (*the_acl)->aces, (*the_acl)->num_aces * sizeof(struct
 102         security_ace));
 103         memcpy(aces+(*the_acl)->num_aces, ace, sizeof(struct security_ace));
 104         new_ace = make_sec_acl(mem_ctx,(*the_acl)->revision,1+(*the_acl)->num_aces, aces);
 105         SAFE_FREE(aces);
 106         (*the_acl) = new_ace;
 107         return True;
 108 }
 109
 110 /* The MSDN is contradictory over the ordering of ACE entries in an ACL.
 111    However NT4 gives a "The information may have been modified by a
 112    computer running Windows NT 5.0" if denied ACEs do not appear before
 113    allowed ACEs. */
 114
 115 static int ace_compare(struct security_ace *ace1, struct security_ace *ace2)
 116 {
 117         if (security_ace_equal(ace1, ace2))
 118                 return 0;
 119
 120         if (ace1->type != ace2->type)
 121                 return ace2->type - ace1->type;
 122
 123         if (dom_sid_compare(&ace1->trustee, &ace2->trustee))
 124                 return dom_sid_compare(&ace1->trustee, &ace2->trustee);
 125
 126         if (ace1->flags != ace2->flags)
 127                 return ace1->flags - ace2->flags;
 128
 129         if (ace1->access_mask != ace2->access_mask)
 130                 return ace1->access_mask - ace2->access_mask;
 131
 132         if (ace1->size != ace2->size)
 133                 return ace1->size - ace2->size;
 134
 135         return memcmp(ace1, ace2, sizeof(struct security_ace));
 136 }
 137
 138 static void sort_acl(struct security_acl *the_acl)
 139 {
 140         uint32_t i;
 141         if (!the_acl) return;
 142
 143         TYPESAFE_QSORT(the_acl->aces, the_acl->num_aces, ace_compare);
 144
 145         for (i=1;i<the_acl->num_aces;) {
 146                 if (security_ace_equal(&the_acl->aces[i-1],
 147                                        &the_acl->aces[i])) {
 148                         int j;
 149                         for (j=i; j<the_acl->num_aces-1; j++) {
 150                                 the_acl->aces[j] = the_acl->aces[j+1];
 151                         }
 152                         the_acl->num_aces--;
 153                 } else {
 154                         i++;
 155                 }
 156         }
 157 }
 158
 159
 160 static int change_share_sec(TALLOC_CTX *mem_ctx, const char *sharename, char *the_acl, enum acl_mode mode)
 161 {
 162         struct security_descriptor *sd = NULL;
 163         struct security_descriptor *old = NULL;
 164         size_t sd_size = 0;
 165         uint32_t i, j;
 166
 167         if (mode != SMB_ACL_SET && mode != SMB_SD_DELETE) {
 168             if (!(old = get_share_security( mem_ctx, sharename, &sd_size )) ) {
 169                 fprintf(stderr, "Unable to retrieve permissions for share "
 170                         "[%s]\n", sharename);
 171                 return -1;
 172             }
 173         }
 174
 175         if ( (mode != SMB_ACL_VIEW && mode != SMB_SD_DELETE) &&
 176             !(sd = parse_acl_string(mem_ctx, the_acl, &sd_size )) ) {
 177                 fprintf( stderr, "Failed to parse acl\n");
 178                 return -1;
 179         }
 180
 181         switch (mode) {
 182         case SMB_ACL_VIEW_ALL:
 183                 /* should not happen */
 184                 return 0;
 185         case SMB_ACL_VIEW:
 186                 sec_desc_print(NULL, stdout, old, false);
 187                 return 0;
 188         case SMB_ACL_DELETE:
 189             for (i=0;sd->dacl && i<sd->dacl->num_aces;i++) {
 190                 bool found = False;
 191
 192                 for (j=0;old->dacl && j<old->dacl->num_aces;j++) {
 193                     if (security_ace_equal(&sd->dacl->aces[i],
 194                                            &old->dacl->aces[j])) {
 195                         uint32_t k;
 196                         for (k=j; k<old->dacl->num_aces-1;k++) {
 197                             old->dacl->aces[k] = old->dacl->aces[k+1];
 198                         }
 199                         old->dacl->num_aces--;
 200                         found = True;
 201                         break;
 202                     }
 203                 }
 204
 205                 if (!found) {
 206                         printf("ACL for ACE:");
 207                         print_ace(NULL, stdout, &sd->dacl->aces[i], false);
 208                         printf(" not found\n");
 209                 }
 210             }
 211             break;
 212         case SMB_ACL_MODIFY:
 213             for (i=0;sd->dacl && i<sd->dacl->num_aces;i++) {
 214                 bool found = False;
 215
 216                 for (j=0;old->dacl && j<old->dacl->num_aces;j++) {
 217                     if (dom_sid_equal(&sd->dacl->aces[i].trustee,
 218                         &old->dacl->aces[j].trustee)) {
 219                         old->dacl->aces[j] = sd->dacl->aces[i];
 220                         found = True;
 221                     }
 222                 }
 223
 224                 if (!found) {
 225                     struct dom_sid_buf buf;
 226                     printf("ACL for SID %s not found\n",
 227                            dom_sid_str_buf(&sd->dacl->aces[i].trustee, &buf));
 228                 }
 229             }
 230
 231             if (sd->owner_sid) {
 232                 old->owner_sid = sd->owner_sid;
 233             }
 234
 235             if (sd->group_sid) {
 236                 old->group_sid = sd->group_sid;
 237             }
 238             break;
 239         case SMB_ACL_ADD:
 240             for (i=0;sd->dacl && i<sd->dacl->num_aces;i++) {
 241                 add_ace(mem_ctx, &old->dacl, &sd->dacl->aces[i]);
 242             }
 243             break;
 244         case SMB_ACL_SET:
 245             old = sd;
 246             break;
 247         case SMB_SD_DELETE:
 248             if (!delete_share_security(sharename)) {
 249                 fprintf( stderr, "Failed to delete security descriptor for "
 250                          "share [%s]\n", sharename );
 251                 return -1;
 252             }
 253             return 0;
 254         default:
 255                 fprintf(stderr, "invalid command\n");
 256                 return -1;
 257         }
 258
 259         /* Denied ACE entries must come before allowed ones */
 260         sort_acl(old->dacl);
 261
 262         if ( !set_share_security( sharename, old ) ) {
 263             fprintf( stderr, "Failed to store acl for share [%s]\n", sharename );
 264             return 2;
 265         }
 266         return 0;
 267 }
 268
 269 static int set_sharesec_sddl(const char *sharename, const char *sddl)
 270 {
 271         struct security_descriptor *sd;
 272         bool ret;
 273
 274         sd = sddl_decode(talloc_tos(), sddl, get_global_sam_sid());
 275         if (sd == NULL) {
 276                 fprintf(stderr, "Failed to parse acl\n");
 277                 return -1;
 278         }
 279
 280         ret = set_share_security(sharename, sd);
 281         TALLOC_FREE(sd);
 282         if (!ret) {
 283                 fprintf(stderr, "Failed to store acl for share [%s]\n",
 284                         sharename);
 285                 return -1;
 286         }
 287
 288         return 0;
 289 }
 290
 291 static int view_sharesec_sddl(const char *sharename)
 292 {
 293         struct security_descriptor *sd;
 294         size_t sd_size;
 295         char *acl;
 296
 297         sd = get_share_security(talloc_tos(), sharename, &sd_size);
 298         if (sd == NULL) {
 299                 fprintf(stderr, "Unable to retrieve permissions for share "
 300                         "[%s]\n", sharename);
 301                 return -1;
 302         }
 303
 304         acl = sddl_encode(talloc_tos(), sd, get_global_sam_sid());
 305         TALLOC_FREE(sd);
 306         if (acl == NULL) {
 307                 fprintf(stderr, "Unable to sddl-encode permissions for share "
 308                         "[%s]\n", sharename);
 309                 return -1;
 310         }
 311         printf("%s\n", acl);
 312         TALLOC_FREE(acl);
 313         return 0;
 314 }
 315
 316 /********************************************************************
 317   main program
 318 ********************************************************************/
 319
 320 enum {
 321         OPT_VIEW_ALL = 1000,
 322 };
 323
 324 int main(int argc, const char *argv[])
 325 {
 326         int opt;
 327         int retval = 0;
 328         enum acl_mode mode = SMB_ACL_SET;
 329         static char *the_acl = NULL;
 330         fstring sharename;
 331         bool force_acl = False;
 332         int snum;
 333         poptContext pc;
 334         bool initialize_sid = False;
 335         struct poptOption long_options[] = {
 336                 POPT_AUTOHELP
 337                 { "remove", 'r', POPT_ARG_STRING, &the_acl, 'r', "Remove ACEs", "ACL" },
 338                 { "modify", 'm', POPT_ARG_STRING, &the_acl, 'm', "Modify existing ACEs", "ACL" },
 339                 { "add", 'a', POPT_ARG_STRING, &the_acl, 'a', "Add ACEs", "ACL" },
 340                 { "replace", 'R', POPT_ARG_STRING, &the_acl, 'R', "Overwrite share permission ACL", "ACLS" },
 341                 { "delete", 'D', POPT_ARG_NONE, NULL, 'D', "Delete the entire security descriptor" },
 342                 { "setsddl", 'S', POPT_ARG_STRING, the_acl, 'S',
 343                   "Set the SD in sddl format" },
 344                 { "viewsddl", 'V', POPT_ARG_NONE, the_acl, 'V',
 345                   "View the SD in sddl format" },
 346                 { "view", 'v', POPT_ARG_NONE, NULL, 'v', "View current share permissions" },
 347                 { "view-all", 0, POPT_ARG_NONE, NULL, OPT_VIEW_ALL,
 348                   "View all current share permissions" },
 349                 { "machine-sid", 'M', POPT_ARG_NONE, NULL, 'M', "Initialize the machine SID" },
 350                 { "force", 'F', POPT_ARG_NONE, NULL, 'F', "Force storing the ACL", "ACLS" },
 351                 POPT_COMMON_SAMBA
 352                 { NULL }
 353         };
 354
 355         if ( !(ctx = talloc_stackframe()) ) {
 356                 fprintf( stderr, "Failed to initialize talloc context!\n");
 357                 return -1;
 358         }
 359
 360         /* set default debug level to 1 regardless of what smb.conf sets */
 361         setup_logging( "sharesec", DEBUG_STDERR);
 362
 363         smb_init_locale();
 364
 365         lp_set_cmdline("log level", "1");
 366
 367         pc = poptGetContext("sharesec", argc, argv, long_options, 0);
 368
 369         poptSetOtherOptionHelp(pc, "sharename\n");
 370
 371         while ((opt = poptGetNextOpt(pc)) != -1) {
 372                 switch (opt) {
 373                 case 'r':
 374                         the_acl = smb_xstrdup(poptGetOptArg(pc));
 375                         mode = SMB_ACL_DELETE;
 376                         break;
 377
 378                 case 'm':
 379                         the_acl = smb_xstrdup(poptGetOptArg(pc));
 380                         mode = SMB_ACL_MODIFY;
 381                         break;
 382
 383                 case 'a':
 384                         the_acl = smb_xstrdup(poptGetOptArg(pc));
 385                         mode = SMB_ACL_ADD;
 386                         break;
 387
 388                 case 'R':
 389                         the_acl = smb_xstrdup(poptGetOptArg(pc));
 390                         mode = SMB_ACL_SET;
 391                         break;
 392
 393                 case 'D':
 394                         mode = SMB_SD_DELETE;
 395                         break;
 396
 397                 case 'S':
 398                         mode = SMB_SD_SETSDDL;
 399                         the_acl = smb_xstrdup(poptGetOptArg(pc));
 400                         break;
 401
 402                 case 'V':
 403                         mode = SMB_SD_VIEWSDDL;
 404                         break;
 405
 406                 case 'v':
 407                         mode = SMB_ACL_VIEW;
 408                         break;
 409
 410                 case 'F':
 411                         force_acl = True;
 412                         break;
 413
 414                 case 'M':
 415                         initialize_sid = True;
 416                         break;
 417                 case OPT_VIEW_ALL:
 418                         mode = SMB_ACL_VIEW_ALL;
 419                         break;
 420                 }
 421         }
 422
 423         setlinebuf(stdout);
 424
 425         cmdline_messaging_context(get_dyn_CONFIGFILE());
 426         lp_load_with_registry_shares(get_dyn_CONFIGFILE());
 427
 428         /* check for initializing secrets.tdb first */
 429
 430         if ( initialize_sid ) {
 431                 struct dom_sid *sid = get_global_sam_sid();
 432                 struct dom_sid_buf buf;
 433
 434                 if ( !sid ) {
 435                         fprintf( stderr, "Failed to retrieve Machine SID!\n");
 436                         return 3;
 437                 }
 438
 439                 printf ("%s\n", dom_sid_str_buf(sid, &buf) );
 440                 return 0;
 441         }
 442
 443         if ( mode == SMB_ACL_VIEW && force_acl ) {
 444                 fprintf( stderr, "Invalid combination of -F and -v\n");
 445                 return -1;
 446         }
 447
 448         if (mode == SMB_ACL_VIEW_ALL) {
 449                 int i;
 450
 451                 for (i=0; i<lp_numservices(); i++) {
 452                         TALLOC_CTX *frame = talloc_stackframe();
 453                         const char *service = lp_servicename(frame, i);
 454
 455                         if (service == NULL) {
 456                                 continue;
 457                         }
 458
 459                         printf("[%s]\n", service);
 460                         change_share_sec(frame, service, NULL, SMB_ACL_VIEW);
 461                         printf("\n");
 462                         TALLOC_FREE(frame);
 463                 }
 464                 goto done;
 465         }
 466
 467         /* get the sharename */
 468
 469         if(!poptPeekArg(pc)) {
 470                 poptPrintUsage(pc, stderr, 0);
 471                 return -1;
 472         }
 473
 474         fstrcpy(sharename, poptGetArg(pc));
 475
 476         snum = lp_servicenumber( sharename );
 477
 478         if ( snum == -1 && !force_acl ) {
 479                 fprintf( stderr, "Invalid sharename: %s\n", sharename);
 480                 return -1;
 481         }
 482
 483         switch (mode) {
 484         case SMB_SD_SETSDDL:
 485                 retval = set_sharesec_sddl(sharename, the_acl);
 486                 break;
 487         case SMB_SD_VIEWSDDL:
 488                 retval = view_sharesec_sddl(sharename);
 489                 break;
 490         default:
 491                 retval = change_share_sec(ctx, sharename, the_acl, mode);
 492                 break;
 493         }
 494
 495 done:
 496         talloc_destroy(ctx);
 497
 498         return retval;
 499 }