source3/utils/net_usershare.c

   1 /*
   2    Samba Unix/Linux SMB client library
   3    Distributed SMB/CIFS Server Management Utility
   4
   5    Copyright (C) Jeremy Allison (jra@samba.org) 2005
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "utils/net.h"
  23
  24 struct {
  25         const char *us_errstr;
  26         enum usershare_err us_err;
  27 } us_errs [] = {
  28         {"",USERSHARE_OK},
  29         {N_("Malformed usershare file"), USERSHARE_MALFORMED_FILE},
  30         {N_("Bad version number"), USERSHARE_BAD_VERSION},
  31         {N_("Malformed path entry"), USERSHARE_MALFORMED_PATH},
  32         {N_("Malformed comment entryfile"), USERSHARE_MALFORMED_COMMENT_DEF},
  33         {N_("Malformed acl definition"), USERSHARE_MALFORMED_ACL_DEF},
  34         {N_("Acl parse error"), USERSHARE_ACL_ERR},
  35         {N_("Path not absolute"), USERSHARE_PATH_NOT_ABSOLUTE},
  36         {N_("Path is denied"), USERSHARE_PATH_IS_DENIED},
  37         {N_("Path not allowed"), USERSHARE_PATH_NOT_ALLOWED},
  38         {N_("Path is not a directory"), USERSHARE_PATH_NOT_DIRECTORY},
  39         {N_("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 = strlower_talloc(talloc_tos(), argv[0])) == NULL) {
 158                 d_fprintf(stderr, _("strlower_talloc 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                 TALLOC_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                 TALLOC_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                 TALLOC_FREE(sharename);
 184                 return -1;
 185         }
 186         TALLOC_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,
 218                         _("get_share_list: cannot open usershare directory %s. "
 219                           "Error %s\n"),
 220                         basepath, strerror(errno) );
 221                 return -1;
 222         }
 223
 224         while((de = sys_readdir(dp)) != 0) {
 225                 SMB_STRUCT_STAT sbuf;
 226                 char *path;
 227                 const char *n = de->d_name;
 228
 229                 /* Ignore . and .. */
 230                 if (*n == '.') {
 231                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 232                                 continue;
 233                         }
 234                 }
 235
 236                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 237                         d_fprintf(stderr,
 238                                   _("get_share_list: ignoring bad share "
 239                                     "name %s\n"), n);
 240                         continue;
 241                 }
 242                 path = talloc_asprintf(ctx,
 243                                         "%s/%s",
 244                                         basepath,
 245                                         n);
 246                 if (!path) {
 247                         sys_closedir(dp);
 248                         return -1;
 249                 }
 250
 251                 if (sys_lstat(path, &sbuf, false) != 0) {
 252                         d_fprintf(stderr,
 253                                 _("get_share_list: can't lstat file %s. Error "
 254                                   "was %s\n"),
 255                                 path, strerror(errno) );
 256                         continue;
 257                 }
 258
 259                 if (!S_ISREG(sbuf.st_ex_mode)) {
 260                         d_fprintf(stderr,
 261                                   _("get_share_list: file %s is not a regular "
 262                                     "file. Ignoring.\n"),
 263                                 path );
 264                         continue;
 265                 }
 266
 267                 if (only_ours && sbuf.st_ex_uid != myuid) {
 268                         continue;
 269                 }
 270
 271                 if (!unix_wild_match(wcard, n)) {
 272                         continue;
 273                 }
 274
 275                 /* (Finally) - add to list. */
 276                 fl = TALLOC_P(ctx, struct file_list);
 277                 if (!fl) {
 278                         sys_closedir(dp);
 279                         return -1;
 280                 }
 281                 fl->pathname = talloc_strdup(ctx, n);
 282                 if (!fl->pathname) {
 283                         sys_closedir(dp);
 284                         return -1;
 285                 }
 286
 287                 DLIST_ADD(flist, fl);
 288         }
 289
 290         sys_closedir(dp);
 291         return 0;
 292 }
 293
 294 enum us_priv_op { US_LIST_OP, US_INFO_OP};
 295
 296 struct us_priv_info {
 297         TALLOC_CTX *ctx;
 298         enum us_priv_op op;
 299         struct net_context *c;
 300 };
 301
 302 /***************************************************************************
 303  Call a function for every share on the list.
 304 ***************************************************************************/
 305
 306 static int process_share_list(int (*fn)(struct file_list *, void *), void *priv)
 307 {
 308         struct file_list *fl;
 309         int ret = 0;
 310
 311         for (fl = flist; fl; fl = fl->next) {
 312                 ret = (*fn)(fl, priv);
 313         }
 314
 315         return ret;
 316 }
 317
 318 /***************************************************************************
 319  Info function.
 320 ***************************************************************************/
 321
 322 static int info_fn(struct file_list *fl, void *priv)
 323 {
 324         SMB_STRUCT_STAT sbuf;
 325         char **lines = NULL;
 326         struct us_priv_info *pi = (struct us_priv_info *)priv;
 327         TALLOC_CTX *ctx = pi->ctx;
 328         struct net_context *c = pi->c;
 329         int fd = -1;
 330         int numlines = 0;
 331         SEC_DESC *psd = NULL;
 332         char *basepath;
 333         char *sharepath = NULL;
 334         char *comment = NULL;
 335         char *acl_str;
 336         int num_aces;
 337         char sep_str[2];
 338         enum usershare_err us_err;
 339         bool guest_ok = false;
 340
 341         sep_str[0] = *lp_winbind_separator();
 342         sep_str[1] = '\0';
 343
 344         basepath = get_basepath(ctx);
 345         if (!basepath) {
 346                 return -1;
 347         }
 348         basepath = talloc_asprintf_append(basepath,
 349                         "/%s",
 350                         fl->pathname);
 351         if (!basepath) {
 352                 return -1;
 353         }
 354
 355 #ifdef O_NOFOLLOW
 356         fd = sys_open(basepath, O_RDONLY|O_NOFOLLOW, 0);
 357 #else
 358         fd = sys_open(basepath, O_RDONLY, 0);
 359 #endif
 360
 361         if (fd == -1) {
 362                 d_fprintf(stderr, _("info_fn: unable to open %s. %s\n"),
 363                         basepath, strerror(errno) );
 364                 return -1;
 365         }
 366
 367         /* Paranoia... */
 368         if (sys_fstat(fd, &sbuf, false) != 0) {
 369                 d_fprintf(stderr,
 370                         _("info_fn: can't fstat file %s. Error was %s\n"),
 371                         basepath, strerror(errno) );
 372                 close(fd);
 373                 return -1;
 374         }
 375
 376         if (!S_ISREG(sbuf.st_ex_mode)) {
 377                 d_fprintf(stderr,
 378                         _("info_fn: file %s is not a regular file. Ignoring.\n"),
 379                         basepath );
 380                 close(fd);
 381                 return -1;
 382         }
 383
 384         lines = fd_lines_load(fd, &numlines, 10240, NULL);
 385         close(fd);
 386
 387         if (lines == NULL) {
 388                 return -1;
 389         }
 390
 391         /* Ensure it's well formed. */
 392         us_err = parse_usershare_file(ctx, &sbuf, fl->pathname, -1, lines, numlines,
 393                                 &sharepath,
 394                                 &comment,
 395                                 &psd,
 396                                 &guest_ok);
 397
 398         TALLOC_FREE(lines);
 399
 400         if (us_err != USERSHARE_OK) {
 401                 d_fprintf(stderr,
 402                         _("info_fn: file %s is not a well formed usershare "
 403                           "file.\n"),
 404                         basepath );
 405                 d_fprintf(stderr, _("info_fn: Error was %s.\n"),
 406                         get_us_error_code(us_err) );
 407                 return -1;
 408         }
 409
 410         acl_str = talloc_strdup(ctx, "usershare_acl=");
 411         if (!acl_str) {
 412                 return -1;
 413         }
 414
 415         for (num_aces = 0; num_aces < psd->dacl->num_aces; num_aces++) {
 416                 const char *domain;
 417                 const char *name;
 418                 NTSTATUS ntstatus;
 419
 420                 ntstatus = net_lookup_name_from_sid(c, ctx,
 421                                                     &psd->dacl->aces[num_aces].trustee,
 422                                                     &domain, &name);
 423
 424                 if (NT_STATUS_IS_OK(ntstatus)) {
 425                         if (domain && *domain) {
 426                                 acl_str = talloc_asprintf_append(acl_str,
 427                                                 "%s%s",
 428                                                 domain,
 429                                                 sep_str);
 430                                 if (!acl_str) {
 431                                         return -1;
 432                                 }
 433                         }
 434                         acl_str = talloc_asprintf_append(acl_str,
 435                                                 "%s",
 436                                                 name);
 437                         if (!acl_str) {
 438                                 return -1;
 439                         }
 440
 441                 } else {
 442                         fstring sidstr;
 443                         sid_to_fstring(sidstr,
 444                                        &psd->dacl->aces[num_aces].trustee);
 445                         acl_str = talloc_asprintf_append(acl_str,
 446                                                 "%s",
 447                                                 sidstr);
 448                         if (!acl_str) {
 449                                 return -1;
 450                         }
 451                 }
 452                 acl_str = talloc_asprintf_append(acl_str, ":");
 453                 if (!acl_str) {
 454                         return -1;
 455                 }
 456
 457                 if (psd->dacl->aces[num_aces].type == SEC_ACE_TYPE_ACCESS_DENIED) {
 458                         acl_str = talloc_asprintf_append(acl_str, "D,");
 459                         if (!acl_str) {
 460                                 return -1;
 461                         }
 462                 } else {
 463                         if (psd->dacl->aces[num_aces].access_mask & GENERIC_ALL_ACCESS) {
 464                                 acl_str = talloc_asprintf_append(acl_str, "F,");
 465                         } else {
 466                                 acl_str = talloc_asprintf_append(acl_str, "R,");
 467                         }
 468                         if (!acl_str) {
 469                                 return -1;
 470                         }
 471                 }
 472         }
 473
 474         /* NOTE: This is smb.conf-like output. Do not translate. */
 475         if (pi->op == US_INFO_OP) {
 476                 d_printf("[%s]\n", fl->pathname );
 477                 d_printf("path=%s\n", sharepath );
 478                 d_printf("comment=%s\n", comment);
 479                 d_printf("%s\n", acl_str);
 480                 d_printf("guest_ok=%c\n\n", guest_ok ? 'y' : 'n');
 481         } else if (pi->op == US_LIST_OP) {
 482                 d_printf("%s\n", fl->pathname);
 483         }
 484
 485         return 0;
 486 }
 487
 488 /***************************************************************************
 489  Print out info (internal detail) on userlevel shares.
 490 ***************************************************************************/
 491
 492 static int net_usershare_info(struct net_context *c, int argc, const char **argv)
 493 {
 494         fstring wcard;
 495         bool only_ours = true;
 496         int ret = -1;
 497         struct us_priv_info pi;
 498         TALLOC_CTX *ctx;
 499
 500         fstrcpy(wcard, "*");
 501
 502         if (c->display_usage)
 503                 return net_usershare_info_usage(c, argc, argv);
 504
 505         if (c->opt_long_list_entries) {
 506                 only_ours = false;
 507         }
 508
 509         switch (argc) {
 510                 case 0:
 511                         break;
 512                 case 1:
 513                         fstrcpy(wcard, argv[0]);
 514                         break;
 515                 default:
 516                         return net_usershare_info_usage(c, argc, argv);
 517         }
 518
 519         strlower_m(wcard);
 520
 521         ctx = talloc_init("share_info");
 522         ret = get_share_list(ctx, wcard, only_ours);
 523         if (ret) {
 524                 return ret;
 525         }
 526
 527         pi.ctx = ctx;
 528         pi.op = US_INFO_OP;
 529         pi.c = c;
 530
 531         ret = process_share_list(info_fn, &pi);
 532         talloc_destroy(ctx);
 533         return ret;
 534 }
 535
 536 /***************************************************************************
 537  Count the current total number of usershares.
 538 ***************************************************************************/
 539
 540 static int count_num_usershares(void)
 541 {
 542         SMB_STRUCT_DIR *dp;
 543         SMB_STRUCT_DIRENT *de;
 544         int num_usershares = 0;
 545         TALLOC_CTX *ctx = talloc_tos();
 546         char *basepath = get_basepath(ctx);
 547
 548         if (!basepath) {
 549                 return -1;
 550         }
 551
 552         dp = sys_opendir(basepath);
 553         if (!dp) {
 554                 d_fprintf(stderr,
 555                         _("count_num_usershares: cannot open usershare "
 556                           "directory %s. Error %s\n"),
 557                         basepath, strerror(errno) );
 558                 return -1;
 559         }
 560
 561         while((de = sys_readdir(dp)) != 0) {
 562                 SMB_STRUCT_STAT sbuf;
 563                 char *path;
 564                 const char *n = de->d_name;
 565
 566                 /* Ignore . and .. */
 567                 if (*n == '.') {
 568                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 569                                 continue;
 570                         }
 571                 }
 572
 573                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 574                         d_fprintf(stderr,
 575                                   _("count_num_usershares: ignoring bad share "
 576                                     "name %s\n"), n);
 577                         continue;
 578                 }
 579                 path = talloc_asprintf(ctx,
 580                                 "%s/%s",
 581                                 basepath,
 582                                 n);
 583                 if (!path) {
 584                         sys_closedir(dp);
 585                         return -1;
 586                 }
 587
 588                 if (sys_lstat(path, &sbuf, false) != 0) {
 589                         d_fprintf(stderr,
 590                                 _("count_num_usershares: can't lstat file %s. "
 591                                   "Error was %s\n"),
 592                                 path, strerror(errno) );
 593                         continue;
 594                 }
 595
 596                 if (!S_ISREG(sbuf.st_ex_mode)) {
 597                         d_fprintf(stderr,
 598                                 _("count_num_usershares: file %s is not a "
 599                                   "regular file. Ignoring.\n"),
 600                                 path );
 601                         continue;
 602                 }
 603                 num_usershares++;
 604         }
 605
 606         sys_closedir(dp);
 607         return num_usershares;
 608 }
 609
 610 /***************************************************************************
 611  Add a single userlevel share.
 612 ***************************************************************************/
 613
 614 static int net_usershare_add(struct net_context *c, int argc, const char **argv)
 615 {
 616         TALLOC_CTX *ctx = talloc_stackframe();
 617         SMB_STRUCT_STAT sbuf;
 618         SMB_STRUCT_STAT lsbuf;
 619         char *sharename;
 620         char *full_path;
 621         char *full_path_tmp;
 622         const char *us_path;
 623         const char *us_comment;
 624         const char *arg_acl;
 625         char *us_acl;
 626         char *file_img;
 627         int num_aces = 0;
 628         int i;
 629         int tmpfd;
 630         const char *pacl;
 631         size_t to_write;
 632         uid_t myeuid = geteuid();
 633         bool guest_ok = false;
 634         int num_usershares;
 635
 636         us_comment = "";
 637         arg_acl = "S-1-1-0:R";
 638
 639         if (c->display_usage)
 640                 return net_usershare_add_usage(c, argc, argv);
 641
 642         switch (argc) {
 643                 case 0:
 644                 case 1:
 645                 default:
 646                         return net_usershare_add_usage(c, argc, argv);
 647                 case 2:
 648                         sharename = strlower_talloc(ctx, argv[0]);
 649                         us_path = argv[1];
 650                         break;
 651                 case 3:
 652                         sharename = strlower_talloc(ctx, argv[0]);
 653                         us_path = argv[1];
 654                         us_comment = argv[2];
 655                         break;
 656                 case 4:
 657                         sharename = strlower_talloc(ctx, argv[0]);
 658                         us_path = argv[1];
 659                         us_comment = argv[2];
 660                         arg_acl = argv[3];
 661                         break;
 662                 case 5:
 663                         sharename = strlower_talloc(ctx, argv[0]);
 664                         us_path = argv[1];
 665                         us_comment = argv[2];
 666                         arg_acl = argv[3];
 667                         if (strlen(arg_acl) == 0) {
 668                                 arg_acl = "S-1-1-0:R";
 669                         }
 670                         if (!strnequal(argv[4], "guest_ok=", 9)) {
 671                                 TALLOC_FREE(ctx);
 672                                 return net_usershare_add_usage(c, argc, argv);
 673                         }
 674                         switch (argv[4][9]) {
 675                                 case 'y':
 676                                 case 'Y':
 677                                         guest_ok = true;
 678                                         break;
 679                                 case 'n':
 680                                 case 'N':
 681                                         guest_ok = false;
 682                                         break;
 683                                 default:
 684                                         TALLOC_FREE(ctx);
 685                                         return net_usershare_add_usage(c, argc, argv);
 686                         }
 687                         break;
 688         }
 689
 690         /* Ensure we're under the "usershare max shares" number. Advisory only. */
 691         num_usershares = count_num_usershares();
 692         if (num_usershares >= lp_usershare_max_shares()) {
 693                 d_fprintf(stderr,
 694                         _("net usershare add: maximum number of allowed "
 695                           "usershares (%d) reached\n"),
 696                         lp_usershare_max_shares() );
 697                 TALLOC_FREE(ctx);
 698                 return -1;
 699         }
 700
 701         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 702                 d_fprintf(stderr, _("net usershare add: share name %s contains "
 703                         "invalid characters (any of %s)\n"),
 704                         sharename, INVALID_SHARENAME_CHARS);
 705                 TALLOC_FREE(ctx);
 706                 return -1;
 707         }
 708
 709         /* Disallow shares the same as users. */
 710         if (getpwnam(sharename)) {
 711                 d_fprintf(stderr,
 712                         _("net usershare add: share name %s is already a valid "
 713                           "system user name\n"),
 714                         sharename );
 715                 TALLOC_FREE(ctx);
 716                 return -1;
 717         }
 718
 719         /* Construct the full path for the usershare file. */
 720         full_path = get_basepath(ctx);
 721         if (!full_path) {
 722                 TALLOC_FREE(ctx);
 723                 return -1;
 724         }
 725         full_path_tmp = talloc_asprintf(ctx,
 726                         "%s/:tmpXXXXXX",
 727                         full_path);
 728         if (!full_path_tmp) {
 729                 TALLOC_FREE(ctx);
 730                 return -1;
 731         }
 732
 733         full_path = talloc_asprintf_append(full_path,
 734                                         "/%s",
 735                                         sharename);
 736         if (!full_path) {
 737                 TALLOC_FREE(ctx);
 738                 return -1;
 739         }
 740
 741         /* The path *must* be absolute. */
 742         if (us_path[0] != '/') {
 743                 d_fprintf(stderr,
 744                         _("net usershare add: path %s is not an absolute "
 745                           "path.\n"),
 746                         us_path);
 747                 TALLOC_FREE(ctx);
 748                 return -1;
 749         }
 750
 751         /* Check the directory to be shared exists. */
 752         if (sys_stat(us_path, &sbuf, false) != 0) {
 753                 d_fprintf(stderr,
 754                         _("net usershare add: cannot stat path %s to ensure "
 755                           "this is a directory. Error was %s\n"),
 756                         us_path, strerror(errno) );
 757                 TALLOC_FREE(ctx);
 758                 return -1;
 759         }
 760
 761         if (!S_ISDIR(sbuf.st_ex_mode)) {
 762                 d_fprintf(stderr,
 763                         _("net usershare add: path %s is not a directory.\n"),
 764                         us_path );
 765                 TALLOC_FREE(ctx);
 766                 return -1;
 767         }
 768
 769         /* If we're not root, check if we're restricted to sharing out directories
 770            that we own only. */
 771
 772         if ((myeuid != 0) && lp_usershare_owner_only() && (myeuid != sbuf.st_ex_uid)) {
 773                 d_fprintf(stderr, _("net usershare add: cannot share path %s as "
 774                         "we are restricted to only sharing directories we own.\n"
 775                         "\tAsk the administrator to add the line \"usershare owner only = false\" \n"
 776                         "\tto the [global] section of the smb.conf to allow this.\n"),
 777                         us_path );
 778                 TALLOC_FREE(ctx);
 779                 return -1;
 780         }
 781
 782         /* No validation needed on comment. Now go through and validate the
 783            acl string. Convert names to SID's as needed. Then run it through
 784            parse_usershare_acl to ensure it's valid. */
 785
 786         /* Start off the string we'll append to. */
 787         us_acl = talloc_strdup(ctx, "");
 788         if (!us_acl) {
 789                 TALLOC_FREE(ctx);
 790                 return -1;
 791         }
 792
 793         pacl = arg_acl;
 794         num_aces = 1;
 795
 796         /* Add the number of ',' characters to get the number of aces. */
 797         num_aces += count_chars(pacl,',');
 798
 799         for (i = 0; i < num_aces; i++) {
 800                 DOM_SID sid;
 801                 const char *pcolon = strchr_m(pacl, ':');
 802                 const char *name;
 803
 804                 if (pcolon == NULL) {
 805                         d_fprintf(stderr,
 806                                 _("net usershare add: malformed acl %s "
 807                                   "(missing ':').\n"),
 808                                 pacl );
 809                         TALLOC_FREE(ctx);
 810                         return -1;
 811                 }
 812
 813                 switch(pcolon[1]) {
 814                         case 'f':
 815                         case 'F':
 816                         case 'd':
 817                         case 'r':
 818                         case 'R':
 819                                 break;
 820                         default:
 821                                 d_fprintf(stderr,
 822                                         _("net usershare add: malformed acl %s "
 823                                           "(access control must be 'r', 'f', "
 824                                           "or 'd')\n"),
 825                                         pacl );
 826                                 TALLOC_FREE(ctx);
 827                                 return -1;
 828                 }
 829
 830                 if (pcolon[2] != ',' && pcolon[2] != '\0') {
 831                         d_fprintf(stderr,
 832                                 _("net usershare add: malformed terminating "
 833                                   "character for acl %s\n"),
 834                                 pacl );
 835                         TALLOC_FREE(ctx);
 836                         return -1;
 837                 }
 838
 839                 /* Get the name */
 840                 if ((name = talloc_strndup(ctx, pacl, pcolon - pacl)) == NULL) {
 841                         d_fprintf(stderr, _("talloc_strndup failed\n"));
 842                         TALLOC_FREE(ctx);
 843                         return -1;
 844                 }
 845                 if (!string_to_sid(&sid, name)) {
 846                         /* Convert to a SID */
 847                         NTSTATUS ntstatus = net_lookup_sid_from_name(c, ctx, name, &sid);
 848                         if (!NT_STATUS_IS_OK(ntstatus)) {
 849                                 d_fprintf(stderr,
 850                                         _("net usershare add: cannot convert "
 851                                           "name \"%s\" to a SID. %s."),
 852                                         name, get_friendly_nt_error_msg(ntstatus) );
 853                                 if (NT_STATUS_EQUAL(ntstatus, NT_STATUS_CONNECTION_REFUSED)) {
 854                                         d_fprintf(stderr,
 855                                             _(" Maybe smbd is not running.\n"));
 856                                 } else {
 857                                         d_fprintf(stderr, "\n");
 858                                 }
 859                                 TALLOC_FREE(ctx);
 860                                 return -1;
 861                         }
 862                 }
 863                 us_acl = talloc_asprintf_append(
 864                         us_acl, "%s:%c,", sid_string_tos(&sid), pcolon[1]);
 865
 866                 /* Move to the next ACL entry. */
 867                 if (pcolon[2] == ',') {
 868                         pacl = &pcolon[3];
 869                 }
 870         }
 871
 872         /* Remove the last ',' */
 873         us_acl[strlen(us_acl)-1] = '\0';
 874
 875         if (guest_ok && !lp_usershare_allow_guests()) {
 876                 d_fprintf(stderr, _("net usershare add: guest_ok=y requested "
 877                         "but the \"usershare allow guests\" parameter is not "
 878                         "enabled by this server.\n"));
 879                 TALLOC_FREE(ctx);
 880                 return -1;
 881         }
 882
 883         /* Create a temporary filename for this share. */
 884         tmpfd = mkstemp(full_path_tmp);
 885
 886         if (tmpfd == -1) {
 887                 d_fprintf(stderr,
 888                           _("net usershare add: cannot create tmp file %s\n"),
 889                           full_path_tmp );
 890                 TALLOC_FREE(ctx);
 891                 return -1;
 892         }
 893
 894         /* Ensure we opened the file we thought we did. */
 895         if (sys_lstat(full_path_tmp, &lsbuf, false) != 0) {
 896                 d_fprintf(stderr,
 897                           _("net usershare add: cannot lstat tmp file %s\n"),
 898                           full_path_tmp );
 899                 TALLOC_FREE(ctx);
 900                 return -1;
 901         }
 902
 903         /* Check this is the same as the file we opened. */
 904         if (sys_fstat(tmpfd, &sbuf, false) != 0) {
 905                 d_fprintf(stderr,
 906                           _("net usershare add: cannot fstat tmp file %s\n"),
 907                           full_path_tmp );
 908                 TALLOC_FREE(ctx);
 909                 return -1;
 910         }
 911
 912         if (!S_ISREG(sbuf.st_ex_mode) || sbuf.st_ex_dev != lsbuf.st_ex_dev || sbuf.st_ex_ino != lsbuf.st_ex_ino) {
 913                 d_fprintf(stderr,
 914                           _("net usershare add: tmp file %s is not a regular "
 915                             "file ?\n"),
 916                           full_path_tmp );
 917                 TALLOC_FREE(ctx);
 918                 return -1;
 919         }
 920
 921         if (fchmod(tmpfd, 0644) == -1) {
 922                 d_fprintf(stderr,
 923                           _("net usershare add: failed to fchmod tmp file %s "
 924                             "to 0644n"),
 925                           full_path_tmp );
 926                 TALLOC_FREE(ctx);
 927                 return -1;
 928         }
 929
 930         /* Create the in-memory image of the file. */
 931         file_img = talloc_strdup(ctx, "#VERSION 2\npath=");
 932         file_img = talloc_asprintf_append(file_img, "%s\ncomment=%s\nusershare_acl=%s\nguest_ok=%c\n",
 933                         us_path, us_comment, us_acl, guest_ok ? 'y' : 'n');
 934
 935         to_write = strlen(file_img);
 936
 937         if (write(tmpfd, file_img, to_write) != to_write) {
 938                 d_fprintf(stderr,
 939                         _("net usershare add: failed to write %u bytes to "
 940                           "file %s. Error was %s\n"),
 941                         (unsigned int)to_write, full_path_tmp, strerror(errno));
 942                 unlink(full_path_tmp);
 943                 TALLOC_FREE(ctx);
 944                 return -1;
 945         }
 946
 947         /* Attempt to replace any existing share by this name. */
 948         if (rename(full_path_tmp, full_path) != 0) {
 949                 unlink(full_path_tmp);
 950                 d_fprintf(stderr,
 951                         _("net usershare add: failed to add share %s. Error "
 952                           "was %s\n"),
 953                         sharename, strerror(errno));
 954                 TALLOC_FREE(ctx);
 955                 close(tmpfd);
 956                 return -1;
 957         }
 958
 959         close(tmpfd);
 960
 961         if (c->opt_long_list_entries) {
 962                 const char *my_argv[2];
 963                 my_argv[0] = sharename;
 964                 my_argv[1] = NULL;
 965                 net_usershare_info(c, 1, my_argv);
 966         }
 967
 968         TALLOC_FREE(ctx);
 969         return 0;
 970 }
 971
 972 #if 0
 973 /***************************************************************************
 974  List function.
 975 ***************************************************************************/
 976
 977 static int list_fn(struct file_list *fl, void *priv)
 978 {
 979         d_printf("%s\n", fl->pathname);
 980         return 0;
 981 }
 982 #endif
 983
 984 /***************************************************************************
 985  List userlevel shares.
 986 ***************************************************************************/
 987
 988 static int net_usershare_list(struct net_context *c, int argc,
 989                               const char **argv)
 990 {
 991         fstring wcard;
 992         bool only_ours = true;
 993         int ret = -1;
 994         struct us_priv_info pi;
 995         TALLOC_CTX *ctx;
 996
 997         fstrcpy(wcard, "*");
 998
 999         if (c->display_usage)
1000                 return net_usershare_list_usage(c, argc, argv);
1001
1002         if (c->opt_long_list_entries) {
1003                 only_ours = false;
1004         }
1005
1006         switch (argc) {
1007                 case 0:
1008                         break;
1009                 case 1:
1010                         fstrcpy(wcard, argv[0]);
1011                         break;
1012                 default:
1013                         return net_usershare_list_usage(c, argc, argv);
1014         }
1015
1016         strlower_m(wcard);
1017
1018         ctx = talloc_init("share_list");
1019         ret = get_share_list(ctx, wcard, only_ours);
1020         if (ret) {
1021                 return ret;
1022         }
1023
1024         pi.ctx = ctx;
1025         pi.op = US_LIST_OP;
1026         pi.c = c;
1027
1028         ret = process_share_list(info_fn, &pi);
1029         talloc_destroy(ctx);
1030         return ret;
1031 }
1032
1033 /***************************************************************************
1034  Entry-point for all the USERSHARE functions.
1035 ***************************************************************************/
1036
1037 int net_usershare(struct net_context *c, int argc, const char **argv)
1038 {
1039         SMB_STRUCT_DIR *dp;
1040
1041         struct functable func[] = {
1042                 {
1043                         "add",
1044                         net_usershare_add,
1045                         NET_TRANSPORT_LOCAL,
1046                         N_("Add/modify user defined share"),
1047                         N_("net usershare add\n"
1048                            "    Add/modify user defined share")
1049                 },
1050                 {
1051                         "delete",
1052                         net_usershare_delete,
1053                         NET_TRANSPORT_LOCAL,
1054                         N_("Delete user defined share"),
1055                         N_("net usershare delete\n"
1056                            "    Delete user defined share")
1057                 },
1058                 {
1059                         "info",
1060                         net_usershare_info,
1061                         NET_TRANSPORT_LOCAL,
1062                         N_("Display information about a user defined share"),
1063                         N_("net usershare info\n"
1064                            "    Display information about a user defined share")
1065                 },
1066                 {
1067                         "list",
1068                         net_usershare_list,
1069                         NET_TRANSPORT_LOCAL,
1070                         N_("List user defined shares"),
1071                         N_("net usershare list\n"
1072                            "    List user defined shares")
1073                 },
1074                 {NULL, NULL, 0, NULL, NULL}
1075         };
1076
1077         if (lp_usershare_max_shares() == 0) {
1078                 d_fprintf(stderr,
1079                           _("net usershare: usershares are currently "
1080                             "disabled\n"));
1081                 return -1;
1082         }
1083
1084         dp = sys_opendir(lp_usershare_path());
1085         if (!dp) {
1086                 int err = errno;
1087                 d_fprintf(stderr,
1088                         _("net usershare: cannot open usershare directory %s. "
1089                           "Error %s\n"),
1090                         lp_usershare_path(), strerror(err) );
1091                 if (err == EACCES) {
1092                         d_fprintf(stderr,
1093                                 _("You do not have permission to create a "
1094                                 "usershare. Ask your administrator to grant "
1095                                 "you permissions to create a share.\n"));
1096                 } else if (err == ENOENT) {
1097                         d_fprintf(stderr,
1098                                 _("Please ask your system administrator to "
1099                                   "enable user sharing.\n"));
1100                 }
1101                 return -1;
1102         }
1103         sys_closedir(dp);
1104
1105         return net_run_function(c, argc, argv, "net usershare", func);
1106 }