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