source/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 || c->display_usage) {
 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->display_usage)
 490                 return net_usershare_info_usage(c, argc, argv);
 491
 492         if (c->opt_long_list_entries) {
 493                 only_ours = false;
 494         }
 495
 496         switch (argc) {
 497                 case 0:
 498                         break;
 499                 case 1:
 500                         fstrcpy(wcard, argv[0]);
 501                         break;
 502                 default:
 503                         return net_usershare_info_usage(c, argc, argv);
 504         }
 505
 506         strlower_m(wcard);
 507
 508         ctx = talloc_init("share_info");
 509         ret = get_share_list(ctx, wcard, only_ours);
 510         if (ret) {
 511                 return ret;
 512         }
 513
 514         pi.ctx = ctx;
 515         pi.op = US_INFO_OP;
 516         pi.c = c;
 517
 518         ret = process_share_list(info_fn, &pi);
 519         talloc_destroy(ctx);
 520         return ret;
 521 }
 522
 523 /***************************************************************************
 524  Count the current total number of usershares.
 525 ***************************************************************************/
 526
 527 static int count_num_usershares(void)
 528 {
 529         SMB_STRUCT_DIR *dp;
 530         SMB_STRUCT_DIRENT *de;
 531         int num_usershares = 0;
 532         TALLOC_CTX *ctx = talloc_tos();
 533         char *basepath = get_basepath(ctx);
 534
 535         if (!basepath) {
 536                 return -1;
 537         }
 538
 539         dp = sys_opendir(basepath);
 540         if (!dp) {
 541                 d_fprintf(stderr, "count_num_usershares: cannot open usershare directory %s. Error %s\n",
 542                         basepath, strerror(errno) );
 543                 return -1;
 544         }
 545
 546         while((de = sys_readdir(dp)) != 0) {
 547                 SMB_STRUCT_STAT sbuf;
 548                 char *path;
 549                 const char *n = de->d_name;
 550
 551                 /* Ignore . and .. */
 552                 if (*n == '.') {
 553                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 554                                 continue;
 555                         }
 556                 }
 557
 558                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 559                         d_fprintf(stderr, "count_num_usershares: ignoring bad share name %s\n",n);
 560                         continue;
 561                 }
 562                 path = talloc_asprintf(ctx,
 563                                 "%s/%s",
 564                                 basepath,
 565                                 n);
 566                 if (!path) {
 567                         sys_closedir(dp);
 568                         return -1;
 569                 }
 570
 571                 if (sys_lstat(path, &sbuf) != 0) {
 572                         d_fprintf(stderr, "count_num_usershares: can't lstat file %s. Error was %s\n",
 573                                 path, strerror(errno) );
 574                         continue;
 575                 }
 576
 577                 if (!S_ISREG(sbuf.st_mode)) {
 578                         d_fprintf(stderr, "count_num_usershares: file %s is not a regular file. Ignoring.\n",
 579                                 path );
 580                         continue;
 581                 }
 582                 num_usershares++;
 583         }
 584
 585         sys_closedir(dp);
 586         return num_usershares;
 587 }
 588
 589 /***************************************************************************
 590  Add a single userlevel share.
 591 ***************************************************************************/
 592
 593 static int net_usershare_add(struct net_context *c, int argc, const char **argv)
 594 {
 595         TALLOC_CTX *ctx = talloc_stackframe();
 596         SMB_STRUCT_STAT sbuf;
 597         SMB_STRUCT_STAT lsbuf;
 598         char *sharename;
 599         char *full_path;
 600         char *full_path_tmp;
 601         const char *us_path;
 602         const char *us_comment;
 603         const char *arg_acl;
 604         char *us_acl;
 605         char *file_img;
 606         int num_aces = 0;
 607         int i;
 608         int tmpfd;
 609         const char *pacl;
 610         size_t to_write;
 611         uid_t myeuid = geteuid();
 612         bool guest_ok = false;
 613         int num_usershares;
 614
 615         us_comment = "";
 616         arg_acl = "S-1-1-0:R";
 617
 618         if (c->display_usage)
 619                 return net_usershare_add_usage(c, argc, argv);
 620
 621         switch (argc) {
 622                 case 0:
 623                 case 1:
 624                 default:
 625                         return net_usershare_add_usage(c, argc, argv);
 626                 case 2:
 627                         sharename = strdup_lower(argv[0]);
 628                         us_path = argv[1];
 629                         break;
 630                 case 3:
 631                         sharename = strdup_lower(argv[0]);
 632                         us_path = argv[1];
 633                         us_comment = argv[2];
 634                         break;
 635                 case 4:
 636                         sharename = strdup_lower(argv[0]);
 637                         us_path = argv[1];
 638                         us_comment = argv[2];
 639                         arg_acl = argv[3];
 640                         break;
 641                 case 5:
 642                         sharename = strdup_lower(argv[0]);
 643                         us_path = argv[1];
 644                         us_comment = argv[2];
 645                         arg_acl = argv[3];
 646                         if (strlen(arg_acl) == 0) {
 647                                 arg_acl = "S-1-1-0:R";
 648                         }
 649                         if (!strnequal(argv[4], "guest_ok=", 9)) {
 650                                 TALLOC_FREE(ctx);
 651                                 return net_usershare_add_usage(c, argc, argv);
 652                         }
 653                         switch (argv[4][9]) {
 654                                 case 'y':
 655                                 case 'Y':
 656                                         guest_ok = true;
 657                                         break;
 658                                 case 'n':
 659                                 case 'N':
 660                                         guest_ok = false;
 661                                         break;
 662                                 default:
 663                                         TALLOC_FREE(ctx);
 664                                         return net_usershare_add_usage(c, argc, argv);
 665                         }
 666                         break;
 667         }
 668
 669         /* Ensure we're under the "usershare max shares" number. Advisory only. */
 670         num_usershares = count_num_usershares();
 671         if (num_usershares >= lp_usershare_max_shares()) {
 672                 d_fprintf(stderr, "net usershare add: maximum number of allowed usershares (%d) reached\n",
 673                         lp_usershare_max_shares() );
 674                 TALLOC_FREE(ctx);
 675                 SAFE_FREE(sharename);
 676                 return -1;
 677         }
 678
 679         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 680                 d_fprintf(stderr, "net usershare add: share name %s contains "
 681                         "invalid characters (any of %s)\n",
 682                         sharename, INVALID_SHARENAME_CHARS);
 683                 TALLOC_FREE(ctx);
 684                 SAFE_FREE(sharename);
 685                 return -1;
 686         }
 687
 688         /* Disallow shares the same as users. */
 689         if (getpwnam(sharename)) {
 690                 d_fprintf(stderr, "net usershare add: share name %s is already a valid system user name\n",
 691                         sharename );
 692                 TALLOC_FREE(ctx);
 693                 SAFE_FREE(sharename);
 694                 return -1;
 695         }
 696
 697         /* Construct the full path for the usershare file. */
 698         full_path = get_basepath(ctx);
 699         if (!full_path) {
 700                 TALLOC_FREE(ctx);
 701                 SAFE_FREE(sharename);
 702                 return -1;
 703         }
 704         full_path_tmp = talloc_asprintf(ctx,
 705                         "%s/:tmpXXXXXX",
 706                         full_path);
 707         if (!full_path_tmp) {
 708                 TALLOC_FREE(ctx);
 709                 SAFE_FREE(sharename);
 710                 return -1;
 711         }
 712
 713         full_path = talloc_asprintf_append(full_path,
 714                                         "/%s",
 715                                         sharename);
 716         if (!full_path) {
 717                 TALLOC_FREE(ctx);
 718                 SAFE_FREE(sharename);
 719                 return -1;
 720         }
 721
 722         /* The path *must* be absolute. */
 723         if (us_path[0] != '/') {
 724                 d_fprintf(stderr,"net usershare add: path %s is not an absolute path.\n",
 725                         us_path);
 726                 TALLOC_FREE(ctx);
 727                 SAFE_FREE(sharename);
 728                 return -1;
 729         }
 730
 731         /* Check the directory to be shared exists. */
 732         if (sys_stat(us_path, &sbuf) != 0) {
 733                 d_fprintf(stderr, "net usershare add: cannot stat path %s to ensure "
 734                         "this is a directory. Error was %s\n",
 735                         us_path, strerror(errno) );
 736                 TALLOC_FREE(ctx);
 737                 SAFE_FREE(sharename);
 738                 return -1;
 739         }
 740
 741         if (!S_ISDIR(sbuf.st_mode)) {
 742                 d_fprintf(stderr, "net usershare add: path %s is not a directory.\n",
 743                         us_path );
 744                 TALLOC_FREE(ctx);
 745                 SAFE_FREE(sharename);
 746                 return -1;
 747         }
 748
 749         /* If we're not root, check if we're restricted to sharing out directories
 750            that we own only. */
 751
 752         if ((myeuid != 0) && lp_usershare_owner_only() && (myeuid != sbuf.st_uid)) {
 753                 d_fprintf(stderr, "net usershare add: cannot share path %s as "
 754                         "we are restricted to only sharing directories we own.\n"
 755                         "\tAsk the administrator to add the line \"usershare owner only = false\" \n"
 756                         "\tto the [global] section of the smb.conf to allow this.\n",
 757                         us_path );
 758                 TALLOC_FREE(ctx);
 759                 SAFE_FREE(sharename);
 760                 return -1;
 761         }
 762
 763         /* No validation needed on comment. Now go through and validate the
 764            acl string. Convert names to SID's as needed. Then run it through
 765            parse_usershare_acl to ensure it's valid. */
 766
 767         /* Start off the string we'll append to. */
 768         us_acl = talloc_strdup(ctx, "");
 769         if (!us_acl) {
 770                 TALLOC_FREE(ctx);
 771                 return -1;
 772         }
 773
 774         pacl = arg_acl;
 775         num_aces = 1;
 776
 777         /* Add the number of ',' characters to get the number of aces. */
 778         num_aces += count_chars(pacl,',');
 779
 780         for (i = 0; i < num_aces; i++) {
 781                 DOM_SID sid;
 782                 const char *pcolon = strchr_m(pacl, ':');
 783                 const char *name;
 784
 785                 if (pcolon == NULL) {
 786                         d_fprintf(stderr, "net usershare add: malformed acl %s (missing ':').\n",
 787                                 pacl );
 788                         TALLOC_FREE(ctx);
 789                         SAFE_FREE(sharename);
 790                         return -1;
 791                 }
 792
 793                 switch(pcolon[1]) {
 794                         case 'f':
 795                         case 'F':
 796                         case 'd':
 797                         case 'r':
 798                         case 'R':
 799                                 break;
 800                         default:
 801                                 d_fprintf(stderr, "net usershare add: malformed acl %s "
 802                                         "(access control must be 'r', 'f', or 'd')\n",
 803                                         pacl );
 804                                 TALLOC_FREE(ctx);
 805                                 SAFE_FREE(sharename);
 806                                 return -1;
 807                 }
 808
 809                 if (pcolon[2] != ',' && pcolon[2] != '\0') {
 810                         d_fprintf(stderr, "net usershare add: malformed terminating character for acl %s\n",
 811                                 pacl );
 812                         TALLOC_FREE(ctx);
 813                         SAFE_FREE(sharename);
 814                         return -1;
 815                 }
 816
 817                 /* Get the name */
 818                 if ((name = talloc_strndup(ctx, pacl, pcolon - pacl)) == NULL) {
 819                         d_fprintf(stderr, "talloc_strndup failed\n");
 820                         TALLOC_FREE(ctx);
 821                         SAFE_FREE(sharename);
 822                         return -1;
 823                 }
 824                 if (!string_to_sid(&sid, name)) {
 825                         /* Convert to a SID */
 826                         NTSTATUS ntstatus = net_lookup_sid_from_name(c, ctx, name, &sid);
 827                         if (!NT_STATUS_IS_OK(ntstatus)) {
 828                                 d_fprintf(stderr, "net usershare add: cannot convert name \"%s\" to a SID. %s.",
 829                                         name, get_friendly_nt_error_msg(ntstatus) );
 830                                 if (NT_STATUS_EQUAL(ntstatus, NT_STATUS_CONNECTION_REFUSED)) {
 831                                         d_fprintf(stderr,  " Maybe smbd is not running.\n");
 832                                 } else {
 833                                         d_fprintf(stderr, "\n");
 834                                 }
 835                                 TALLOC_FREE(ctx);
 836                                 SAFE_FREE(sharename);
 837                                 return -1;
 838                         }
 839                 }
 840                 us_acl = talloc_asprintf_append(
 841                         us_acl, "%s:%c,", sid_string_tos(&sid), pcolon[1]);
 842
 843                 /* Move to the next ACL entry. */
 844                 if (pcolon[2] == ',') {
 845                         pacl = &pcolon[3];
 846                 }
 847         }
 848
 849         /* Remove the last ',' */
 850         us_acl[strlen(us_acl)-1] = '\0';
 851
 852         if (guest_ok && !lp_usershare_allow_guests()) {
 853                 d_fprintf(stderr, "net usershare add: guest_ok=y requested "
 854                         "but the \"usershare allow guests\" parameter is not enabled "
 855                         "by this server.\n");
 856                 TALLOC_FREE(ctx);
 857                 SAFE_FREE(sharename);
 858                 return -1;
 859         }
 860
 861         /* Create a temporary filename for this share. */
 862         tmpfd = smb_mkstemp(full_path_tmp);
 863
 864         if (tmpfd == -1) {
 865                 d_fprintf(stderr, "net usershare add: cannot create tmp file %s\n",
 866                                 full_path_tmp );
 867                 TALLOC_FREE(ctx);
 868                 SAFE_FREE(sharename);
 869                 return -1;
 870         }
 871
 872         /* Ensure we opened the file we thought we did. */
 873         if (sys_lstat(full_path_tmp, &lsbuf) != 0) {
 874                 d_fprintf(stderr, "net usershare add: cannot lstat tmp file %s\n",
 875                                 full_path_tmp );
 876                 TALLOC_FREE(ctx);
 877                 SAFE_FREE(sharename);
 878                 return -1;
 879         }
 880
 881         /* Check this is the same as the file we opened. */
 882         if (sys_fstat(tmpfd, &sbuf) != 0) {
 883                 d_fprintf(stderr, "net usershare add: cannot fstat tmp file %s\n",
 884                                 full_path_tmp );
 885                 TALLOC_FREE(ctx);
 886                 SAFE_FREE(sharename);
 887                 return -1;
 888         }
 889
 890         if (!S_ISREG(sbuf.st_mode) || sbuf.st_dev != lsbuf.st_dev || sbuf.st_ino != lsbuf.st_ino) {
 891                 d_fprintf(stderr, "net usershare add: tmp file %s is not a regular file ?\n",
 892                                 full_path_tmp );
 893                 TALLOC_FREE(ctx);
 894                 SAFE_FREE(sharename);
 895                 return -1;
 896         }
 897
 898         if (fchmod(tmpfd, 0644) == -1) {
 899                 d_fprintf(stderr, "net usershare add: failed to fchmod tmp file %s to 0644n",
 900                                 full_path_tmp );
 901                 TALLOC_FREE(ctx);
 902                 SAFE_FREE(sharename);
 903                 return -1;
 904         }
 905
 906         /* Create the in-memory image of the file. */
 907         file_img = talloc_strdup(ctx, "#VERSION 2\npath=");
 908         file_img = talloc_asprintf_append(file_img, "%s\ncomment=%s\nusershare_acl=%s\nguest_ok=%c\n",
 909                         us_path, us_comment, us_acl, guest_ok ? 'y' : 'n');
 910
 911         to_write = strlen(file_img);
 912
 913         if (write(tmpfd, file_img, to_write) != to_write) {
 914                 d_fprintf(stderr, "net usershare add: failed to write %u bytes to file %s. Error was %s\n",
 915                         (unsigned int)to_write, full_path_tmp, strerror(errno));
 916                 unlink(full_path_tmp);
 917                 TALLOC_FREE(ctx);
 918                 SAFE_FREE(sharename);
 919                 return -1;
 920         }
 921
 922         /* Attempt to replace any existing share by this name. */
 923         if (rename(full_path_tmp, full_path) != 0) {
 924                 unlink(full_path_tmp);
 925                 d_fprintf(stderr, "net usershare add: failed to add share %s. Error was %s\n",
 926                         sharename, strerror(errno));
 927                 TALLOC_FREE(ctx);
 928                 close(tmpfd);
 929                 SAFE_FREE(sharename);
 930                 return -1;
 931         }
 932
 933         close(tmpfd);
 934
 935         if (c->opt_long_list_entries) {
 936                 const char *my_argv[2];
 937                 my_argv[0] = sharename;
 938                 my_argv[1] = NULL;
 939                 net_usershare_info(c, 1, my_argv);
 940         }
 941
 942         SAFE_FREE(sharename);
 943         TALLOC_FREE(ctx);
 944         return 0;
 945 }
 946
 947 #if 0
 948 /***************************************************************************
 949  List function.
 950 ***************************************************************************/
 951
 952 static int list_fn(struct file_list *fl, void *priv)
 953 {
 954         d_printf("%s\n", fl->pathname);
 955         return 0;
 956 }
 957 #endif
 958
 959 /***************************************************************************
 960  List userlevel shares.
 961 ***************************************************************************/
 962
 963 static int net_usershare_list(struct net_context *c, int argc,
 964                               const char **argv)
 965 {
 966         fstring wcard;
 967         bool only_ours = true;
 968         int ret = -1;
 969         struct us_priv_info pi;
 970         TALLOC_CTX *ctx;
 971
 972         fstrcpy(wcard, "*");
 973
 974         if (c->display_usage)
 975                 return net_usershare_list_usage(c, argc, argv);
 976
 977         if (c->opt_long_list_entries) {
 978                 only_ours = false;
 979         }
 980
 981         switch (argc) {
 982                 case 0:
 983                         break;
 984                 case 1:
 985                         fstrcpy(wcard, argv[0]);
 986                         break;
 987                 default:
 988                         return net_usershare_list_usage(c, argc, argv);
 989         }
 990
 991         strlower_m(wcard);
 992
 993         ctx = talloc_init("share_list");
 994         ret = get_share_list(ctx, wcard, only_ours);
 995         if (ret) {
 996                 return ret;
 997         }
 998
 999         pi.ctx = ctx;
1000         pi.op = US_LIST_OP;
1001
1002         ret = process_share_list(info_fn, &pi);
1003         talloc_destroy(ctx);
1004         return ret;
1005 }
1006
1007 /***************************************************************************
1008  Entry-point for all the USERSHARE functions.
1009 ***************************************************************************/
1010
1011 int net_usershare(struct net_context *c, int argc, const char **argv)
1012 {
1013         SMB_STRUCT_DIR *dp;
1014
1015         struct functable func[] = {
1016                 {
1017                         "add",
1018                         net_usershare_add,
1019                         NET_TRANSPORT_LOCAL,
1020                         "Add/modify user defined share",
1021                         "net usershare add\n"
1022                         "    Add/modify user defined share"
1023                 },
1024                 {
1025                         "delete",
1026                         net_usershare_delete,
1027                         NET_TRANSPORT_LOCAL,
1028                         "Delete user defined share",
1029                         "net usershare delete\n"
1030                         "    Delete user defined share"
1031                 },
1032                 {
1033                         "info",
1034                         net_usershare_info,
1035                         NET_TRANSPORT_LOCAL,
1036                         "Display information about a user defined share",
1037                         "net usershare info\n"
1038                         "    Display information about a user defined share"
1039                 },
1040                 {
1041                         "list",
1042                         net_usershare_list,
1043                         NET_TRANSPORT_LOCAL,
1044                         "List user defined shares",
1045                         "net usershare list\n"
1046                         "    List user defined shares"
1047                 },
1048                 {NULL, NULL, 0, NULL, NULL}
1049         };
1050
1051         if (lp_usershare_max_shares() == 0) {
1052                 d_fprintf(stderr, "net usershare: usershares are currently disabled\n");
1053                 return -1;
1054         }
1055
1056         dp = sys_opendir(lp_usershare_path());
1057         if (!dp) {
1058                 int err = errno;
1059                 d_fprintf(stderr, "net usershare: cannot open usershare directory %s. Error %s\n",
1060                         lp_usershare_path(), strerror(err) );
1061                 if (err == EACCES) {
1062                         d_fprintf(stderr, "You do not have permission to create a usershare. Ask your "
1063                                 "administrator to grant you permissions to create a share.\n");
1064                 } else if (err == ENOENT) {
1065                         d_fprintf(stderr, "Please ask your system administrator to "
1066                                 "enable user sharing.\n");
1067                 }
1068                 return -1;
1069         }
1070         sys_closedir(dp);
1071
1072         return net_run_function(c, argc, argv, "net usershare", func);
1073 }