source3/utils/net_usershare.c

   1 /*
   2    Samba Unix/Linux SMB client library
   3    Distributed SMB/CIFS Server Management Utility
   4
   5    Copyright (C) Jeremy Allison (jra@samba.org) 2005
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "utils/net.h"
  23
  24 struct {
  25         const char *us_errstr;
  26         enum usershare_err us_err;
  27 } us_errs [] = {
  28         {"",USERSHARE_OK},
  29         {"Malformed usershare file", USERSHARE_MALFORMED_FILE},
  30         {"Bad version number", USERSHARE_BAD_VERSION},
  31         {"Malformed path entry", USERSHARE_MALFORMED_PATH},
  32         {"Malformed comment entryfile", USERSHARE_MALFORMED_COMMENT_DEF},
  33         {"Malformed acl definition", USERSHARE_MALFORMED_ACL_DEF},
  34         {"Acl parse error", USERSHARE_ACL_ERR},
  35         {"Path not absolute", USERSHARE_PATH_NOT_ABSOLUTE},
  36         {"Path is denied", USERSHARE_PATH_IS_DENIED},
  37         {"Path not allowed", USERSHARE_PATH_NOT_ALLOWED},
  38         {"Path is not a directory", USERSHARE_PATH_NOT_DIRECTORY},
  39         {"System error", USERSHARE_POSIX_ERR},
  40         {NULL,(enum usershare_err)-1}
  41 };
  42
  43 static const char *get_us_error_code(enum usershare_err us_err)
  44 {
  45         char *result;
  46         int idx = 0;
  47
  48         while (us_errs[idx].us_errstr != NULL) {
  49                 if (us_errs[idx].us_err == us_err) {
  50                         return us_errs[idx].us_errstr;
  51                 }
  52                 idx++;
  53         }
  54
  55         result = talloc_asprintf(talloc_tos(), "Usershare error code (0x%x)",
  56                                  (unsigned int)us_err);
  57         SMB_ASSERT(result != NULL);
  58         return result;
  59 }
  60
  61 /* The help subsystem for the USERSHARE subcommand */
  62
  63 static int net_usershare_add_usage(struct net_context *c, int argc, const char **argv)
  64 {
  65         char chr = *lp_winbind_separator();
  66         d_printf(
  67                 "net usershare add [-l|--long] <sharename> <path> [<comment>] [<acl>] [<guest_ok=[y|n]>]\n"
  68                 "\tAdds the specified share name for this user.\n"
  69                 "\t<sharename> is the new share name.\n"
  70                 "\t<path> is the path on the filesystem to export.\n"
  71                 "\t<comment> is the optional comment for the new share.\n"
  72                 "\t<acl> is an optional share acl in the format \"DOMAIN%cname:X,DOMAIN%cname:X,....\"\n"
  73                 "\t<guest_ok=y> if present sets \"guest ok = yes\" on this usershare.\n"
  74                 "\t\t\"X\" represents a permission and can be any one of the characters f, r or d\n"
  75                 "\t\twhere \"f\" means full control, \"r\" means read-only, \"d\" means deny access.\n"
  76                 "\t\tname may be a domain user or group. For local users use the local server name "
  77                 "instead of \"DOMAIN\"\n"
  78                 "\t\tThe default acl is \"Everyone:r\" which allows everyone read-only access.\n"
  79                 "\tAdd -l or --long to print the info on the newly added share.\n",
  80                 chr, chr );
  81         return -1;
  82 }
  83
  84 static int net_usershare_delete_usage(struct net_context *c, int argc, const char **argv)
  85 {
  86         d_printf(
  87                 "net usershare delete <sharename>\n"\
  88                 "\tdeletes the specified share name for this user.\n");
  89         return -1;
  90 }
  91
  92 static int net_usershare_info_usage(struct net_context *c, int argc, const char **argv)
  93 {
  94         d_printf(
  95                 "net usershare info [-l|--long] [wildcard sharename]\n"\
  96                 "\tPrints out the path, comment and acl elements of shares that match the wildcard.\n"
  97                 "\tBy default only gives info on shares owned by the current user\n"
  98                 "\tAdd -l or --long to apply this to all shares\n"
  99                 "\tOmit the sharename or use a wildcard of '*' to see all shares\n");
 100         return -1;
 101 }
 102
 103 static int net_usershare_list_usage(struct net_context *c, int argc, const char **argv)
 104 {
 105         d_printf(
 106                 "net usershare list [-l|--long] [wildcard sharename]\n"\
 107                 "\tLists the names of all shares that match the wildcard.\n"
 108                 "\tBy default only lists shares owned by the current user\n"
 109                 "\tAdd -l or --long to apply this to all shares\n"
 110                 "\tOmit the sharename or use a wildcard of '*' to see all shares\n");
 111         return -1;
 112 }
 113
 114 int net_usershare_usage(struct net_context *c, int argc, const char **argv)
 115 {
 116         d_printf("net usershare add <sharename> <path> [<comment>] [<acl>] [<guest_ok=[y|n]>] to "
 117                                 "add or change a user defined share.\n"
 118                 "net usershare delete <sharename> to delete a user defined share.\n"
 119                 "net usershare info [-l|--long] [wildcard sharename] to print info about a user defined share.\n"
 120                 "net usershare list [-l|--long] [wildcard sharename] to list user defined shares.\n"
 121                 "net usershare help\n"\
 122                 "\nType \"net usershare help <option>\" to get more information on that option\n\n");
 123
 124         net_common_flags_usage(c, argc, argv);
 125         return -1;
 126 }
 127
 128 /***************************************************************************
 129 ***************************************************************************/
 130
 131 static char *get_basepath(TALLOC_CTX *ctx)
 132 {
 133         char *basepath = talloc_strdup(ctx, lp_usershare_path());
 134
 135         if (!basepath) {
 136                 return NULL;
 137         }
 138         if ((basepath[0] != '\0') && (basepath[strlen(basepath)-1] == '/')) {
 139                 basepath[strlen(basepath)-1] = '\0';
 140         }
 141         return basepath;
 142 }
 143
 144 /***************************************************************************
 145  Delete a single userlevel share.
 146 ***************************************************************************/
 147
 148 static int net_usershare_delete(struct net_context *c, int argc, const char **argv)
 149 {
 150         char *us_path;
 151         char *sharename;
 152
 153         if (argc != 1) {
 154                 return net_usershare_delete_usage(c, argc, argv);
 155         }
 156
 157         if ((sharename = strdup_lower(argv[0])) == NULL) {
 158                 d_fprintf(stderr, "strdup failed\n");
 159                 return -1;
 160         }
 161
 162         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 163                 d_fprintf(stderr, "net usershare delete: share name %s contains "
 164                         "invalid characters (any of %s)\n",
 165                         sharename, INVALID_SHARENAME_CHARS);
 166                 SAFE_FREE(sharename);
 167                 return -1;
 168         }
 169
 170         us_path = talloc_asprintf(talloc_tos(),
 171                                 "%s/%s",
 172                                 lp_usershare_path(),
 173                                 sharename);
 174         if (!us_path) {
 175                 SAFE_FREE(sharename);
 176                 return -1;
 177         }
 178
 179         if (unlink(us_path) != 0) {
 180                 d_fprintf(stderr, "net usershare delete: unable to remove usershare %s. "
 181                         "Error was %s\n",
 182                         us_path, strerror(errno));
 183                 SAFE_FREE(sharename);
 184                 return -1;
 185         }
 186         SAFE_FREE(sharename);
 187         return 0;
 188 }
 189
 190 /***************************************************************************
 191  Data structures to handle a list of usershare files.
 192 ***************************************************************************/
 193
 194 struct file_list {
 195         struct file_list *next, *prev;
 196         const char *pathname;
 197 };
 198
 199 static struct file_list *flist;
 200
 201 /***************************************************************************
 202 ***************************************************************************/
 203
 204 static int get_share_list(TALLOC_CTX *ctx, const char *wcard, bool only_ours)
 205 {
 206         SMB_STRUCT_DIR *dp;
 207         SMB_STRUCT_DIRENT *de;
 208         uid_t myuid = geteuid();
 209         struct file_list *fl = NULL;
 210         char *basepath = get_basepath(ctx);
 211
 212         if (!basepath) {
 213                 return -1;
 214         }
 215         dp = sys_opendir(basepath);
 216         if (!dp) {
 217                 d_fprintf(stderr, "get_share_list: cannot open usershare directory %s. Error %s\n",
 218                         basepath, strerror(errno) );
 219                 return -1;
 220         }
 221
 222         while((de = sys_readdir(dp)) != 0) {
 223                 SMB_STRUCT_STAT sbuf;
 224                 char *path;
 225                 const char *n = de->d_name;
 226
 227                 /* Ignore . and .. */
 228                 if (*n == '.') {
 229                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 230                                 continue;
 231                         }
 232                 }
 233
 234                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 235                         d_fprintf(stderr, "get_share_list: ignoring bad share name %s\n",n);
 236                         continue;
 237                 }
 238                 path = talloc_asprintf(ctx,
 239                                         "%s/%s",
 240                                         basepath,
 241                                         n);
 242                 if (!path) {
 243                         sys_closedir(dp);
 244                         return -1;
 245                 }
 246
 247                 if (sys_lstat(path, &sbuf) != 0) {
 248                         d_fprintf(stderr, "get_share_list: can't lstat file %s. Error was %s\n",
 249                                 path, strerror(errno) );
 250                         continue;
 251                 }
 252
 253                 if (!S_ISREG(sbuf.st_mode)) {
 254                         d_fprintf(stderr, "get_share_list: file %s is not a regular file. Ignoring.\n",
 255                                 path );
 256                         continue;
 257                 }
 258
 259                 if (only_ours && sbuf.st_uid != myuid) {
 260                         continue;
 261                 }
 262
 263                 if (!unix_wild_match(wcard, n)) {
 264                         continue;
 265                 }
 266
 267                 /* (Finally) - add to list. */
 268                 fl = TALLOC_P(ctx, struct file_list);
 269                 if (!fl) {
 270                         sys_closedir(dp);
 271                         return -1;
 272                 }
 273                 fl->pathname = talloc_strdup(ctx, n);
 274                 if (!fl->pathname) {
 275                         sys_closedir(dp);
 276                         return -1;
 277                 }
 278
 279                 DLIST_ADD(flist, fl);
 280         }
 281
 282         sys_closedir(dp);
 283         return 0;
 284 }
 285
 286 enum us_priv_op { US_LIST_OP, US_INFO_OP};
 287
 288 struct us_priv_info {
 289         TALLOC_CTX *ctx;
 290         enum us_priv_op op;
 291         struct net_context *c;
 292 };
 293
 294 /***************************************************************************
 295  Call a function for every share on the list.
 296 ***************************************************************************/
 297
 298 static int process_share_list(int (*fn)(struct file_list *, void *), void *priv)
 299 {
 300         struct file_list *fl;
 301         int ret = 0;
 302
 303         for (fl = flist; fl; fl = fl->next) {
 304                 ret = (*fn)(fl, priv);
 305         }
 306
 307         return ret;
 308 }
 309
 310 /***************************************************************************
 311  Info function.
 312 ***************************************************************************/
 313
 314 static int info_fn(struct file_list *fl, void *priv)
 315 {
 316         SMB_STRUCT_STAT sbuf;
 317         char **lines = NULL;
 318         struct us_priv_info *pi = (struct us_priv_info *)priv;
 319         TALLOC_CTX *ctx = pi->ctx;
 320         struct net_context *c = pi->c;
 321         int fd = -1;
 322         int numlines = 0;
 323         SEC_DESC *psd = NULL;
 324         char *basepath;
 325         char *sharepath = NULL;
 326         char *comment = NULL;
 327         char *acl_str;
 328         int num_aces;
 329         char sep_str[2];
 330         enum usershare_err us_err;
 331         bool guest_ok = False;
 332
 333         sep_str[0] = *lp_winbind_separator();
 334         sep_str[1] = '\0';
 335
 336         basepath = get_basepath(ctx);
 337         if (!basepath) {
 338                 return -1;
 339         }
 340         basepath = talloc_asprintf_append(basepath,
 341                         "/%s",
 342                         fl->pathname);
 343         if (!basepath) {
 344                 return -1;
 345         }
 346
 347 #ifdef O_NOFOLLOW
 348         fd = sys_open(basepath, O_RDONLY|O_NOFOLLOW, 0);
 349 #else
 350         fd = sys_open(basepath, O_RDONLY, 0);
 351 #endif
 352
 353         if (fd == -1) {
 354                 d_fprintf(stderr, "info_fn: unable to open %s. %s\n",
 355                         basepath, strerror(errno) );
 356                 return -1;
 357         }
 358
 359         /* Paranoia... */
 360         if (sys_fstat(fd, &sbuf) != 0) {
 361                 d_fprintf(stderr, "info_fn: can't fstat file %s. Error was %s\n",
 362                         basepath, strerror(errno) );
 363                 close(fd);
 364                 return -1;
 365         }
 366
 367         if (!S_ISREG(sbuf.st_mode)) {
 368                 d_fprintf(stderr, "info_fn: file %s is not a regular file. Ignoring.\n",
 369                         basepath );
 370                 close(fd);
 371                 return -1;
 372         }
 373
 374         lines = fd_lines_load(fd, &numlines, 10240);
 375         close(fd);
 376
 377         if (lines == NULL) {
 378                 return -1;
 379         }
 380
 381         /* Ensure it's well formed. */
 382         us_err = parse_usershare_file(ctx, &sbuf, fl->pathname, -1, lines, numlines,
 383                                 &sharepath,
 384                                 &comment,
 385                                 &psd,
 386                                 &guest_ok);
 387
 388         file_lines_free(lines);
 389
 390         if (us_err != USERSHARE_OK) {
 391                 d_fprintf(stderr, "info_fn: file %s is not a well formed usershare file.\n",
 392                         basepath );
 393                 d_fprintf(stderr, "info_fn: Error was %s.\n",
 394                         get_us_error_code(us_err) );
 395                 return -1;
 396         }
 397
 398         acl_str = talloc_strdup(ctx, "usershare_acl=");
 399         if (!acl_str) {
 400                 return -1;
 401         }
 402
 403         for (num_aces = 0; num_aces < psd->dacl->num_aces; num_aces++) {
 404                 const char *domain;
 405                 const char *name;
 406                 NTSTATUS ntstatus;
 407
 408                 ntstatus = net_lookup_name_from_sid(c, ctx,
 409                                                     &psd->dacl->aces[num_aces].trustee,
 410                                                     &domain, &name);
 411
 412                 if (NT_STATUS_IS_OK(ntstatus)) {
 413                         if (domain && *domain) {
 414                                 acl_str = talloc_asprintf_append(acl_str,
 415                                                 "%s%s",
 416                                                 domain,
 417                                                 sep_str);
 418                                 if (!acl_str) {
 419                                         return -1;
 420                                 }
 421                         }
 422                         acl_str = talloc_asprintf_append(acl_str,
 423                                                 "%s",
 424                                                 name);
 425                         if (!acl_str) {
 426                                 return -1;
 427                         }
 428
 429                 } else {
 430                         fstring sidstr;
 431                         sid_to_fstring(sidstr,
 432                                        &psd->dacl->aces[num_aces].trustee);
 433                         acl_str = talloc_asprintf_append(acl_str,
 434                                                 "%s",
 435                                                 sidstr);
 436                         if (!acl_str) {
 437                                 return -1;
 438                         }
 439                 }
 440                 acl_str = talloc_asprintf_append(acl_str, ":");
 441                 if (!acl_str) {
 442                         return -1;
 443                 }
 444
 445                 if (psd->dacl->aces[num_aces].type == SEC_ACE_TYPE_ACCESS_DENIED) {
 446                         acl_str = talloc_asprintf_append(acl_str, "D,");
 447                         if (!acl_str) {
 448                                 return -1;
 449                         }
 450                 } else {
 451                         if (psd->dacl->aces[num_aces].access_mask & GENERIC_ALL_ACCESS) {
 452                                 acl_str = talloc_asprintf_append(acl_str, "F,");
 453                         } else {
 454                                 acl_str = talloc_asprintf_append(acl_str, "R,");
 455                         }
 456                         if (!acl_str) {
 457                                 return -1;
 458                         }
 459                 }
 460         }
 461
 462         if (pi->op == US_INFO_OP) {
 463                 d_printf("[%s]\n", fl->pathname );
 464                 d_printf("path=%s\n", sharepath );
 465                 d_printf("comment=%s\n", comment);
 466                 d_printf("%s\n", acl_str);
 467                 d_printf("guest_ok=%c\n\n", guest_ok ? 'y' : 'n');
 468         } else if (pi->op == US_LIST_OP) {
 469                 d_printf("%s\n", fl->pathname);
 470         }
 471
 472         return 0;
 473 }
 474
 475 /***************************************************************************
 476  Print out info (internal detail) on userlevel shares.
 477 ***************************************************************************/
 478
 479 static int net_usershare_info(struct net_context *c, int argc, const char **argv)
 480 {
 481         fstring wcard;
 482         bool only_ours = True;
 483         int ret = -1;
 484         struct us_priv_info pi;
 485         TALLOC_CTX *ctx;
 486
 487         fstrcpy(wcard, "*");
 488
 489         if (c->opt_long_list_entries) {
 490                 only_ours = False;
 491         }
 492
 493         switch (argc) {
 494                 case 0:
 495                         break;
 496                 case 1:
 497                         fstrcpy(wcard, argv[0]);
 498                         break;
 499                 default:
 500                         return net_usershare_info_usage(c, argc, argv);
 501         }
 502
 503         strlower_m(wcard);
 504
 505         ctx = talloc_init("share_info");
 506         ret = get_share_list(ctx, wcard, only_ours);
 507         if (ret) {
 508                 return ret;
 509         }
 510
 511         pi.ctx = ctx;
 512         pi.op = US_INFO_OP;
 513         pi.c = c;
 514
 515         ret = process_share_list(info_fn, &pi);
 516         talloc_destroy(ctx);
 517         return ret;
 518 }
 519
 520 /***************************************************************************
 521  Count the current total number of usershares.
 522 ***************************************************************************/
 523
 524 static int count_num_usershares(void)
 525 {
 526         SMB_STRUCT_DIR *dp;
 527         SMB_STRUCT_DIRENT *de;
 528         int num_usershares = 0;
 529         TALLOC_CTX *ctx = talloc_tos();
 530         char *basepath = get_basepath(ctx);
 531
 532         if (!basepath) {
 533                 return -1;
 534         }
 535
 536         dp = sys_opendir(basepath);
 537         if (!dp) {
 538                 d_fprintf(stderr, "count_num_usershares: cannot open usershare directory %s. Error %s\n",
 539                         basepath, strerror(errno) );
 540                 return -1;
 541         }
 542
 543         while((de = sys_readdir(dp)) != 0) {
 544                 SMB_STRUCT_STAT sbuf;
 545                 char *path;
 546                 const char *n = de->d_name;
 547
 548                 /* Ignore . and .. */
 549                 if (*n == '.') {
 550                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 551                                 continue;
 552                         }
 553                 }
 554
 555                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 556                         d_fprintf(stderr, "count_num_usershares: ignoring bad share name %s\n",n);
 557                         continue;
 558                 }
 559                 path = talloc_asprintf(ctx,
 560                                 "%s/%s",
 561                                 basepath,
 562                                 n);
 563                 if (!path) {
 564                         sys_closedir(dp);
 565                         return -1;
 566                 }
 567
 568                 if (sys_lstat(path, &sbuf) != 0) {
 569                         d_fprintf(stderr, "count_num_usershares: can't lstat file %s. Error was %s\n",
 570                                 path, strerror(errno) );
 571                         continue;
 572                 }
 573
 574                 if (!S_ISREG(sbuf.st_mode)) {
 575                         d_fprintf(stderr, "count_num_usershares: file %s is not a regular file. Ignoring.\n",
 576                                 path );
 577                         continue;
 578                 }
 579                 num_usershares++;
 580         }
 581
 582         sys_closedir(dp);
 583         return num_usershares;
 584 }
 585
 586 /***************************************************************************
 587  Add a single userlevel share.
 588 ***************************************************************************/
 589
 590 static int net_usershare_add(struct net_context *c, int argc, const char **argv)
 591 {
 592         TALLOC_CTX *ctx = talloc_stackframe();
 593         SMB_STRUCT_STAT sbuf;
 594         SMB_STRUCT_STAT lsbuf;
 595         char *sharename;
 596         char *full_path;
 597         char *full_path_tmp;
 598         const char *us_path;
 599         const char *us_comment;
 600         const char *arg_acl;
 601         char *us_acl;
 602         char *file_img;
 603         int num_aces = 0;
 604         int i;
 605         int tmpfd;
 606         const char *pacl;
 607         size_t to_write;
 608         uid_t myeuid = geteuid();
 609         bool guest_ok = False;
 610         int num_usershares;
 611
 612         us_comment = "";
 613         arg_acl = "S-1-1-0:R";
 614
 615         switch (argc) {
 616                 case 0:
 617                 case 1:
 618                 default:
 619                         return net_usershare_add_usage(c, argc, argv);
 620                 case 2:
 621                         sharename = strdup_lower(argv[0]);
 622                         us_path = argv[1];
 623                         break;
 624                 case 3:
 625                         sharename = strdup_lower(argv[0]);
 626                         us_path = argv[1];
 627                         us_comment = argv[2];
 628                         break;
 629                 case 4:
 630                         sharename = strdup_lower(argv[0]);
 631                         us_path = argv[1];
 632                         us_comment = argv[2];
 633                         arg_acl = argv[3];
 634                         break;
 635                 case 5:
 636                         sharename = strdup_lower(argv[0]);
 637                         us_path = argv[1];
 638                         us_comment = argv[2];
 639                         arg_acl = argv[3];
 640                         if (strlen(arg_acl) == 0) {
 641                                 arg_acl = "S-1-1-0:R";
 642                         }
 643                         if (!strnequal(argv[4], "guest_ok=", 9)) {
 644                                 TALLOC_FREE(ctx);
 645                                 return net_usershare_add_usage(c, argc, argv);
 646                         }
 647                         switch (argv[4][9]) {
 648                                 case 'y':
 649                                 case 'Y':
 650                                         guest_ok = True;
 651                                         break;
 652                                 case 'n':
 653                                 case 'N':
 654                                         guest_ok = False;
 655                                         break;
 656                                 default:
 657                                         TALLOC_FREE(ctx);
 658                                         return net_usershare_add_usage(c, argc, argv);
 659                         }
 660                         break;
 661         }
 662
 663         /* Ensure we're under the "usershare max shares" number. Advisory only. */
 664         num_usershares = count_num_usershares();
 665         if (num_usershares >= lp_usershare_max_shares()) {
 666                 d_fprintf(stderr, "net usershare add: maximum number of allowed usershares (%d) reached\n",
 667                         lp_usershare_max_shares() );
 668                 TALLOC_FREE(ctx);
 669                 SAFE_FREE(sharename);
 670                 return -1;
 671         }
 672
 673         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 674                 d_fprintf(stderr, "net usershare add: share name %s contains "
 675                         "invalid characters (any of %s)\n",
 676                         sharename, INVALID_SHARENAME_CHARS);
 677                 TALLOC_FREE(ctx);
 678                 SAFE_FREE(sharename);
 679                 return -1;
 680         }
 681
 682         /* Disallow shares the same as users. */
 683         if (getpwnam(sharename)) {
 684                 d_fprintf(stderr, "net usershare add: share name %s is already a valid system user name\n",
 685                         sharename );
 686                 TALLOC_FREE(ctx);
 687                 SAFE_FREE(sharename);
 688                 return -1;
 689         }
 690
 691         /* Construct the full path for the usershare file. */
 692         full_path = get_basepath(ctx);
 693         if (!full_path) {
 694                 TALLOC_FREE(ctx);
 695                 SAFE_FREE(sharename);
 696                 return -1;
 697         }
 698         full_path_tmp = talloc_asprintf(ctx,
 699                         "%s/:tmpXXXXXX",
 700                         full_path);
 701         if (!full_path_tmp) {
 702                 TALLOC_FREE(ctx);
 703                 SAFE_FREE(sharename);
 704                 return -1;
 705         }
 706
 707         full_path = talloc_asprintf_append(full_path,
 708                                         "/%s",
 709                                         sharename);
 710         if (!full_path) {
 711                 TALLOC_FREE(ctx);
 712                 SAFE_FREE(sharename);
 713                 return -1;
 714         }
 715
 716         /* The path *must* be absolute. */
 717         if (us_path[0] != '/') {
 718                 d_fprintf(stderr,"net usershare add: path %s is not an absolute path.\n",
 719                         us_path);
 720                 TALLOC_FREE(ctx);
 721                 SAFE_FREE(sharename);
 722                 return -1;
 723         }
 724
 725         /* Check the directory to be shared exists. */
 726         if (sys_stat(us_path, &sbuf) != 0) {
 727                 d_fprintf(stderr, "net usershare add: cannot stat path %s to ensure "
 728                         "this is a directory. Error was %s\n",
 729                         us_path, strerror(errno) );
 730                 TALLOC_FREE(ctx);
 731                 SAFE_FREE(sharename);
 732                 return -1;
 733         }
 734
 735         if (!S_ISDIR(sbuf.st_mode)) {
 736                 d_fprintf(stderr, "net usershare add: path %s is not a directory.\n",
 737                         us_path );
 738                 TALLOC_FREE(ctx);
 739                 SAFE_FREE(sharename);
 740                 return -1;
 741         }
 742
 743         /* If we're not root, check if we're restricted to sharing out directories
 744            that we own only. */
 745
 746         if ((myeuid != 0) && lp_usershare_owner_only() && (myeuid != sbuf.st_uid)) {
 747                 d_fprintf(stderr, "net usershare add: cannot share path %s as "
 748                         "we are restricted to only sharing directories we own.\n"
 749                         "\tAsk the administrator to add the line \"usershare owner only = False\" \n"
 750                         "\tto the [global] section of the smb.conf to allow this.\n",
 751                         us_path );
 752                 TALLOC_FREE(ctx);
 753                 SAFE_FREE(sharename);
 754                 return -1;
 755         }
 756
 757         /* No validation needed on comment. Now go through and validate the
 758            acl string. Convert names to SID's as needed. Then run it through
 759            parse_usershare_acl to ensure it's valid. */
 760
 761         /* Start off the string we'll append to. */
 762         us_acl = talloc_strdup(ctx, "");
 763         if (!us_acl) {
 764                 TALLOC_FREE(ctx);
 765                 return -1;
 766         }
 767
 768         pacl = arg_acl;
 769         num_aces = 1;
 770
 771         /* Add the number of ',' characters to get the number of aces. */
 772         num_aces += count_chars(pacl,',');
 773
 774         for (i = 0; i < num_aces; i++) {
 775                 DOM_SID sid;
 776                 const char *pcolon = strchr_m(pacl, ':');
 777                 const char *name;
 778
 779                 if (pcolon == NULL) {
 780                         d_fprintf(stderr, "net usershare add: malformed acl %s (missing ':').\n",
 781                                 pacl );
 782                         TALLOC_FREE(ctx);
 783                         SAFE_FREE(sharename);
 784                         return -1;
 785                 }
 786
 787                 switch(pcolon[1]) {
 788                         case 'f':
 789                         case 'F':
 790                         case 'd':
 791                         case 'r':
 792                         case 'R':
 793                                 break;
 794                         default:
 795                                 d_fprintf(stderr, "net usershare add: malformed acl %s "
 796                                         "(access control must be 'r', 'f', or 'd')\n",
 797                                         pacl );
 798                                 TALLOC_FREE(ctx);
 799                                 SAFE_FREE(sharename);
 800                                 return -1;
 801                 }
 802
 803                 if (pcolon[2] != ',' && pcolon[2] != '\0') {
 804                         d_fprintf(stderr, "net usershare add: malformed terminating character for acl %s\n",
 805                                 pacl );
 806                         TALLOC_FREE(ctx);
 807                         SAFE_FREE(sharename);
 808                         return -1;
 809                 }
 810
 811                 /* Get the name */
 812                 if ((name = talloc_strndup(ctx, pacl, pcolon - pacl)) == NULL) {
 813                         d_fprintf(stderr, "talloc_strndup failed\n");
 814                         TALLOC_FREE(ctx);
 815                         SAFE_FREE(sharename);
 816                         return -1;
 817                 }
 818                 if (!string_to_sid(&sid, name)) {
 819                         /* Convert to a SID */
 820                         NTSTATUS ntstatus = net_lookup_sid_from_name(c, ctx, name, &sid);
 821                         if (!NT_STATUS_IS_OK(ntstatus)) {
 822                                 d_fprintf(stderr, "net usershare add: cannot convert name \"%s\" to a SID. %s.",
 823                                         name, get_friendly_nt_error_msg(ntstatus) );
 824                                 if (NT_STATUS_EQUAL(ntstatus, NT_STATUS_CONNECTION_REFUSED)) {
 825                                         d_fprintf(stderr,  " Maybe smbd is not running.\n");
 826                                 } else {
 827                                         d_fprintf(stderr, "\n");
 828                                 }
 829                                 TALLOC_FREE(ctx);
 830                                 SAFE_FREE(sharename);
 831                                 return -1;
 832                         }
 833                 }
 834                 us_acl = talloc_asprintf_append(
 835                         us_acl, "%s:%c,", sid_string_tos(&sid), pcolon[1]);
 836
 837                 /* Move to the next ACL entry. */
 838                 if (pcolon[2] == ',') {
 839                         pacl = &pcolon[3];
 840                 }
 841         }
 842
 843         /* Remove the last ',' */
 844         us_acl[strlen(us_acl)-1] = '\0';
 845
 846         if (guest_ok && !lp_usershare_allow_guests()) {
 847                 d_fprintf(stderr, "net usershare add: guest_ok=y requested "
 848                         "but the \"usershare allow guests\" parameter is not enabled "
 849                         "by this server.\n");
 850                 TALLOC_FREE(ctx);
 851                 SAFE_FREE(sharename);
 852                 return -1;
 853         }
 854
 855         /* Create a temporary filename for this share. */
 856         tmpfd = smb_mkstemp(full_path_tmp);
 857
 858         if (tmpfd == -1) {
 859                 d_fprintf(stderr, "net usershare add: cannot create tmp file %s\n",
 860                                 full_path_tmp );
 861                 TALLOC_FREE(ctx);
 862                 SAFE_FREE(sharename);
 863                 return -1;
 864         }
 865
 866         /* Ensure we opened the file we thought we did. */
 867         if (sys_lstat(full_path_tmp, &lsbuf) != 0) {
 868                 d_fprintf(stderr, "net usershare add: cannot lstat tmp file %s\n",
 869                                 full_path_tmp );
 870                 TALLOC_FREE(ctx);
 871                 SAFE_FREE(sharename);
 872                 return -1;
 873         }
 874
 875         /* Check this is the same as the file we opened. */
 876         if (sys_fstat(tmpfd, &sbuf) != 0) {
 877                 d_fprintf(stderr, "net usershare add: cannot fstat tmp file %s\n",
 878                                 full_path_tmp );
 879                 TALLOC_FREE(ctx);
 880                 SAFE_FREE(sharename);
 881                 return -1;
 882         }
 883
 884         if (!S_ISREG(sbuf.st_mode) || sbuf.st_dev != lsbuf.st_dev || sbuf.st_ino != lsbuf.st_ino) {
 885                 d_fprintf(stderr, "net usershare add: tmp file %s is not a regular file ?\n",
 886                                 full_path_tmp );
 887                 TALLOC_FREE(ctx);
 888                 SAFE_FREE(sharename);
 889                 return -1;
 890         }
 891
 892         if (fchmod(tmpfd, 0644) == -1) {
 893                 d_fprintf(stderr, "net usershare add: failed to fchmod tmp file %s to 0644n",
 894                                 full_path_tmp );
 895                 TALLOC_FREE(ctx);
 896                 SAFE_FREE(sharename);
 897                 return -1;
 898         }
 899
 900         /* Create the in-memory image of the file. */
 901         file_img = talloc_strdup(ctx, "#VERSION 2\npath=");
 902         file_img = talloc_asprintf_append(file_img, "%s\ncomment=%s\nusershare_acl=%s\nguest_ok=%c\n",
 903                         us_path, us_comment, us_acl, guest_ok ? 'y' : 'n');
 904
 905         to_write = strlen(file_img);
 906
 907         if (write(tmpfd, file_img, to_write) != to_write) {
 908                 d_fprintf(stderr, "net usershare add: failed to write %u bytes to file %s. Error was %s\n",
 909                         (unsigned int)to_write, full_path_tmp, strerror(errno));
 910                 unlink(full_path_tmp);
 911                 TALLOC_FREE(ctx);
 912                 SAFE_FREE(sharename);
 913                 return -1;
 914         }
 915
 916         /* Attempt to replace any existing share by this name. */
 917         if (rename(full_path_tmp, full_path) != 0) {
 918                 unlink(full_path_tmp);
 919                 d_fprintf(stderr, "net usershare add: failed to add share %s. Error was %s\n",
 920                         sharename, strerror(errno));
 921                 TALLOC_FREE(ctx);
 922                 close(tmpfd);
 923                 SAFE_FREE(sharename);
 924                 return -1;
 925         }
 926
 927         close(tmpfd);
 928
 929         if (c->opt_long_list_entries) {
 930                 const char *my_argv[2];
 931                 my_argv[0] = sharename;
 932                 my_argv[1] = NULL;
 933                 net_usershare_info(c, 1, my_argv);
 934         }
 935
 936         SAFE_FREE(sharename);
 937         TALLOC_FREE(ctx);
 938         return 0;
 939 }
 940
 941 #if 0
 942 /***************************************************************************
 943  List function.
 944 ***************************************************************************/
 945
 946 static int list_fn(struct file_list *fl, void *priv)
 947 {
 948         d_printf("%s\n", fl->pathname);
 949         return 0;
 950 }
 951 #endif
 952
 953 /***************************************************************************
 954  List userlevel shares.
 955 ***************************************************************************/
 956
 957 static int net_usershare_list(struct net_context *c, int argc,
 958                               const char **argv)
 959 {
 960         fstring wcard;
 961         bool only_ours = True;
 962         int ret = -1;
 963         struct us_priv_info pi;
 964         TALLOC_CTX *ctx;
 965
 966         fstrcpy(wcard, "*");
 967
 968         if (c->opt_long_list_entries) {
 969                 only_ours = False;
 970         }
 971
 972         switch (argc) {
 973                 case 0:
 974                         break;
 975                 case 1:
 976                         fstrcpy(wcard, argv[0]);
 977                         break;
 978                 default:
 979                         return net_usershare_list_usage(c, argc, argv);
 980         }
 981
 982         strlower_m(wcard);
 983
 984         ctx = talloc_init("share_list");
 985         ret = get_share_list(ctx, wcard, only_ours);
 986         if (ret) {
 987                 return ret;
 988         }
 989
 990         pi.ctx = ctx;
 991         pi.op = US_LIST_OP;
 992
 993         ret = process_share_list(info_fn, &pi);
 994         talloc_destroy(ctx);
 995         return ret;
 996 }
 997
 998 /***************************************************************************
 999  Handle "net usershare help *" subcommands.
1000 ***************************************************************************/
1001
1002 int net_usershare_help(struct net_context *c, int argc, const char **argv)
1003 {
1004         struct functable func[] = {
1005                 {"ADD", net_usershare_add_usage},
1006                 {"DELETE", net_usershare_delete_usage},
1007                 {"INFO", net_usershare_info_usage},
1008                 {"LIST", net_usershare_list_usage},
1009                 {NULL, NULL}};
1010
1011         return net_run_function(c, argc, argv, func, net_usershare_usage);
1012 }
1013
1014 /***************************************************************************
1015  Entry-point for all the USERSHARE functions.
1016 ***************************************************************************/
1017
1018 int net_usershare(struct net_context *c, int argc, const char **argv)
1019 {
1020         SMB_STRUCT_DIR *dp;
1021
1022         struct functable func[] = {
1023                 {"ADD", net_usershare_add},
1024                 {"DELETE", net_usershare_delete},
1025                 {"INFO", net_usershare_info},
1026                 {"LIST", net_usershare_list},
1027                 {"HELP", net_usershare_help},
1028                 {NULL, NULL}
1029         };
1030
1031         if (lp_usershare_max_shares() == 0) {
1032                 d_fprintf(stderr, "net usershare: usershares are currently disabled\n");
1033                 return -1;
1034         }
1035
1036         dp = sys_opendir(lp_usershare_path());
1037         if (!dp) {
1038                 int err = errno;
1039                 d_fprintf(stderr, "net usershare: cannot open usershare directory %s. Error %s\n",
1040                         lp_usershare_path(), strerror(err) );
1041                 if (err == EACCES) {
1042                         d_fprintf(stderr, "You do not have permission to create a usershare. Ask your "
1043                                 "administrator to grant you permissions to create a share.\n");
1044                 } else if (err == ENOENT) {
1045                         d_fprintf(stderr, "Please ask your system administrator to "
1046                                 "enable user sharing.\n");
1047                 }
1048                 return -1;
1049         }
1050         sys_closedir(dp);
1051
1052         return net_run_function(c, argc, argv, func, net_usershare_usage);
1053 }