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