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