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, lp_fake_dir_create_times())
 252                     != 0) {
 253                         d_fprintf(stderr,
 254                                 _("get_share_list: can't lstat file %s. Error "
 255                                   "was %s\n"),
 256                                 path, strerror(errno) );
 257                         continue;
 258                 }
 259
 260                 if (!S_ISREG(sbuf.st_ex_mode)) {
 261                         d_fprintf(stderr,
 262                                   _("get_share_list: file %s is not a regular "
 263                                     "file. Ignoring.\n"),
 264                                 path );
 265                         continue;
 266                 }
 267
 268                 if (only_ours && sbuf.st_ex_uid != myuid) {
 269                         continue;
 270                 }
 271
 272                 if (!unix_wild_match(wcard, n)) {
 273                         continue;
 274                 }
 275
 276                 /* (Finally) - add to list. */
 277                 fl = TALLOC_P(ctx, struct file_list);
 278                 if (!fl) {
 279                         sys_closedir(dp);
 280                         return -1;
 281                 }
 282                 fl->pathname = talloc_strdup(ctx, n);
 283                 if (!fl->pathname) {
 284                         sys_closedir(dp);
 285                         return -1;
 286                 }
 287
 288                 DLIST_ADD(flist, fl);
 289         }
 290
 291         sys_closedir(dp);
 292         return 0;
 293 }
 294
 295 enum us_priv_op { US_LIST_OP, US_INFO_OP};
 296
 297 struct us_priv_info {
 298         TALLOC_CTX *ctx;
 299         enum us_priv_op op;
 300         struct net_context *c;
 301 };
 302
 303 /***************************************************************************
 304  Call a function for every share on the list.
 305 ***************************************************************************/
 306
 307 static int process_share_list(int (*fn)(struct file_list *, void *), void *priv)
 308 {
 309         struct file_list *fl;
 310         int ret = 0;
 311
 312         for (fl = flist; fl; fl = fl->next) {
 313                 ret = (*fn)(fl, priv);
 314         }
 315
 316         return ret;
 317 }
 318
 319 /***************************************************************************
 320  Info function.
 321 ***************************************************************************/
 322
 323 static int info_fn(struct file_list *fl, void *priv)
 324 {
 325         SMB_STRUCT_STAT sbuf;
 326         char **lines = NULL;
 327         struct us_priv_info *pi = (struct us_priv_info *)priv;
 328         TALLOC_CTX *ctx = pi->ctx;
 329         struct net_context *c = pi->c;
 330         int fd = -1;
 331         int numlines = 0;
 332         SEC_DESC *psd = NULL;
 333         char *basepath;
 334         char *sharepath = NULL;
 335         char *comment = NULL;
 336         char *acl_str;
 337         int num_aces;
 338         char sep_str[2];
 339         enum usershare_err us_err;
 340         bool guest_ok = false;
 341
 342         sep_str[0] = *lp_winbind_separator();
 343         sep_str[1] = '\0';
 344
 345         basepath = get_basepath(ctx);
 346         if (!basepath) {
 347                 return -1;
 348         }
 349         basepath = talloc_asprintf_append(basepath,
 350                         "/%s",
 351                         fl->pathname);
 352         if (!basepath) {
 353                 return -1;
 354         }
 355
 356 #ifdef O_NOFOLLOW
 357         fd = sys_open(basepath, O_RDONLY|O_NOFOLLOW, 0);
 358 #else
 359         fd = sys_open(basepath, O_RDONLY, 0);
 360 #endif
 361
 362         if (fd == -1) {
 363                 d_fprintf(stderr, _("info_fn: unable to open %s. %s\n"),
 364                         basepath, strerror(errno) );
 365                 return -1;
 366         }
 367
 368         /* Paranoia... */
 369         if (sys_fstat(fd, &sbuf, lp_fake_dir_create_times()) != 0) {
 370                 d_fprintf(stderr,
 371                         _("info_fn: can't fstat file %s. Error was %s\n"),
 372                         basepath, strerror(errno) );
 373                 close(fd);
 374                 return -1;
 375         }
 376
 377         if (!S_ISREG(sbuf.st_ex_mode)) {
 378                 d_fprintf(stderr,
 379                         _("info_fn: file %s is not a regular file. Ignoring.\n"),
 380                         basepath );
 381                 close(fd);
 382                 return -1;
 383         }
 384
 385         lines = fd_lines_load(fd, &numlines, 10240, NULL);
 386         close(fd);
 387
 388         if (lines == NULL) {
 389                 return -1;
 390         }
 391
 392         /* Ensure it's well formed. */
 393         us_err = parse_usershare_file(ctx, &sbuf, fl->pathname, -1, lines, numlines,
 394                                 &sharepath,
 395                                 &comment,
 396                                 &psd,
 397                                 &guest_ok);
 398
 399         TALLOC_FREE(lines);
 400
 401         if (us_err != USERSHARE_OK) {
 402                 d_fprintf(stderr,
 403                         _("info_fn: file %s is not a well formed usershare "
 404                           "file.\n"),
 405                         basepath );
 406                 d_fprintf(stderr, _("info_fn: Error was %s.\n"),
 407                         get_us_error_code(us_err) );
 408                 return -1;
 409         }
 410
 411         acl_str = talloc_strdup(ctx, "usershare_acl=");
 412         if (!acl_str) {
 413                 return -1;
 414         }
 415
 416         for (num_aces = 0; num_aces < psd->dacl->num_aces; num_aces++) {
 417                 const char *domain;
 418                 const char *name;
 419                 NTSTATUS ntstatus;
 420
 421                 ntstatus = net_lookup_name_from_sid(c, ctx,
 422                                                     &psd->dacl->aces[num_aces].trustee,
 423                                                     &domain, &name);
 424
 425                 if (NT_STATUS_IS_OK(ntstatus)) {
 426                         if (domain && *domain) {
 427                                 acl_str = talloc_asprintf_append(acl_str,
 428                                                 "%s%s",
 429                                                 domain,
 430                                                 sep_str);
 431                                 if (!acl_str) {
 432                                         return -1;
 433                                 }
 434                         }
 435                         acl_str = talloc_asprintf_append(acl_str,
 436                                                 "%s",
 437                                                 name);
 438                         if (!acl_str) {
 439                                 return -1;
 440                         }
 441
 442                 } else {
 443                         fstring sidstr;
 444                         sid_to_fstring(sidstr,
 445                                        &psd->dacl->aces[num_aces].trustee);
 446                         acl_str = talloc_asprintf_append(acl_str,
 447                                                 "%s",
 448                                                 sidstr);
 449                         if (!acl_str) {
 450                                 return -1;
 451                         }
 452                 }
 453                 acl_str = talloc_asprintf_append(acl_str, ":");
 454                 if (!acl_str) {
 455                         return -1;
 456                 }
 457
 458                 if (psd->dacl->aces[num_aces].type == SEC_ACE_TYPE_ACCESS_DENIED) {
 459                         acl_str = talloc_asprintf_append(acl_str, "D,");
 460                         if (!acl_str) {
 461                                 return -1;
 462                         }
 463                 } else {
 464                         if (psd->dacl->aces[num_aces].access_mask & GENERIC_ALL_ACCESS) {
 465                                 acl_str = talloc_asprintf_append(acl_str, "F,");
 466                         } else {
 467                                 acl_str = talloc_asprintf_append(acl_str, "R,");
 468                         }
 469                         if (!acl_str) {
 470                                 return -1;
 471                         }
 472                 }
 473         }
 474
 475         /* NOTE: This is smb.conf-like output. Do not translate. */
 476         if (pi->op == US_INFO_OP) {
 477                 d_printf("[%s]\n", fl->pathname );
 478                 d_printf("path=%s\n", sharepath );
 479                 d_printf("comment=%s\n", comment);
 480                 d_printf("%s\n", acl_str);
 481                 d_printf("guest_ok=%c\n\n", guest_ok ? 'y' : 'n');
 482         } else if (pi->op == US_LIST_OP) {
 483                 d_printf("%s\n", fl->pathname);
 484         }
 485
 486         return 0;
 487 }
 488
 489 /***************************************************************************
 490  Print out info (internal detail) on userlevel shares.
 491 ***************************************************************************/
 492
 493 static int net_usershare_info(struct net_context *c, int argc, const char **argv)
 494 {
 495         fstring wcard;
 496         bool only_ours = true;
 497         int ret = -1;
 498         struct us_priv_info pi;
 499         TALLOC_CTX *ctx;
 500
 501         fstrcpy(wcard, "*");
 502
 503         if (c->display_usage)
 504                 return net_usershare_info_usage(c, argc, argv);
 505
 506         if (c->opt_long_list_entries) {
 507                 only_ours = false;
 508         }
 509
 510         switch (argc) {
 511                 case 0:
 512                         break;
 513                 case 1:
 514                         fstrcpy(wcard, argv[0]);
 515                         break;
 516                 default:
 517                         return net_usershare_info_usage(c, argc, argv);
 518         }
 519
 520         strlower_m(wcard);
 521
 522         ctx = talloc_init("share_info");
 523         ret = get_share_list(ctx, wcard, only_ours);
 524         if (ret) {
 525                 return ret;
 526         }
 527
 528         pi.ctx = ctx;
 529         pi.op = US_INFO_OP;
 530         pi.c = c;
 531
 532         ret = process_share_list(info_fn, &pi);
 533         talloc_destroy(ctx);
 534         return ret;
 535 }
 536
 537 /***************************************************************************
 538  Count the current total number of usershares.
 539 ***************************************************************************/
 540
 541 static int count_num_usershares(void)
 542 {
 543         SMB_STRUCT_DIR *dp;
 544         SMB_STRUCT_DIRENT *de;
 545         int num_usershares = 0;
 546         TALLOC_CTX *ctx = talloc_tos();
 547         char *basepath = get_basepath(ctx);
 548
 549         if (!basepath) {
 550                 return -1;
 551         }
 552
 553         dp = sys_opendir(basepath);
 554         if (!dp) {
 555                 d_fprintf(stderr,
 556                         _("count_num_usershares: cannot open usershare "
 557                           "directory %s. Error %s\n"),
 558                         basepath, strerror(errno) );
 559                 return -1;
 560         }
 561
 562         while((de = sys_readdir(dp)) != 0) {
 563                 SMB_STRUCT_STAT sbuf;
 564                 char *path;
 565                 const char *n = de->d_name;
 566
 567                 /* Ignore . and .. */
 568                 if (*n == '.') {
 569                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 570                                 continue;
 571                         }
 572                 }
 573
 574                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 575                         d_fprintf(stderr,
 576                                   _("count_num_usershares: ignoring bad share "
 577                                     "name %s\n"), n);
 578                         continue;
 579                 }
 580                 path = talloc_asprintf(ctx,
 581                                 "%s/%s",
 582                                 basepath,
 583                                 n);
 584                 if (!path) {
 585                         sys_closedir(dp);
 586                         return -1;
 587                 }
 588
 589                 if (sys_lstat(path, &sbuf, lp_fake_dir_create_times())
 590                     != 0) {
 591                         d_fprintf(stderr,
 592                                 _("count_num_usershares: can't lstat file %s. "
 593                                   "Error was %s\n"),
 594                                 path, strerror(errno) );
 595                         continue;
 596                 }
 597
 598                 if (!S_ISREG(sbuf.st_ex_mode)) {
 599                         d_fprintf(stderr,
 600                                 _("count_num_usershares: file %s is not a "
 601                                   "regular file. Ignoring.\n"),
 602                                 path );
 603                         continue;
 604                 }
 605                 num_usershares++;
 606         }
 607
 608         sys_closedir(dp);
 609         return num_usershares;
 610 }
 611
 612 /***************************************************************************
 613  Add a single userlevel share.
 614 ***************************************************************************/
 615
 616 static int net_usershare_add(struct net_context *c, int argc, const char **argv)
 617 {
 618         TALLOC_CTX *ctx = talloc_stackframe();
 619         SMB_STRUCT_STAT sbuf;
 620         SMB_STRUCT_STAT lsbuf;
 621         char *sharename;
 622         char *full_path;
 623         char *full_path_tmp;
 624         const char *us_path;
 625         const char *us_comment;
 626         const char *arg_acl;
 627         char *us_acl;
 628         char *file_img;
 629         int num_aces = 0;
 630         int i;
 631         int tmpfd;
 632         const char *pacl;
 633         size_t to_write;
 634         uid_t myeuid = geteuid();
 635         bool guest_ok = false;
 636         int num_usershares;
 637
 638         us_comment = "";
 639         arg_acl = "S-1-1-0:R";
 640
 641         if (c->display_usage)
 642                 return net_usershare_add_usage(c, argc, argv);
 643
 644         switch (argc) {
 645                 case 0:
 646                 case 1:
 647                 default:
 648                         return net_usershare_add_usage(c, argc, argv);
 649                 case 2:
 650                         sharename = strlower_talloc(ctx, argv[0]);
 651                         us_path = argv[1];
 652                         break;
 653                 case 3:
 654                         sharename = strlower_talloc(ctx, argv[0]);
 655                         us_path = argv[1];
 656                         us_comment = argv[2];
 657                         break;
 658                 case 4:
 659                         sharename = strlower_talloc(ctx, argv[0]);
 660                         us_path = argv[1];
 661                         us_comment = argv[2];
 662                         arg_acl = argv[3];
 663                         break;
 664                 case 5:
 665                         sharename = strlower_talloc(ctx, argv[0]);
 666                         us_path = argv[1];
 667                         us_comment = argv[2];
 668                         arg_acl = argv[3];
 669                         if (strlen(arg_acl) == 0) {
 670                                 arg_acl = "S-1-1-0:R";
 671                         }
 672                         if (!strnequal(argv[4], "guest_ok=", 9)) {
 673                                 TALLOC_FREE(ctx);
 674                                 return net_usershare_add_usage(c, argc, argv);
 675                         }
 676                         switch (argv[4][9]) {
 677                                 case 'y':
 678                                 case 'Y':
 679                                         guest_ok = true;
 680                                         break;
 681                                 case 'n':
 682                                 case 'N':
 683                                         guest_ok = false;
 684                                         break;
 685                                 default:
 686                                         TALLOC_FREE(ctx);
 687                                         return net_usershare_add_usage(c, argc, argv);
 688                         }
 689                         break;
 690         }
 691
 692         /* Ensure we're under the "usershare max shares" number. Advisory only. */
 693         num_usershares = count_num_usershares();
 694         if (num_usershares >= lp_usershare_max_shares()) {
 695                 d_fprintf(stderr,
 696                         _("net usershare add: maximum number of allowed "
 697                           "usershares (%d) reached\n"),
 698                         lp_usershare_max_shares() );
 699                 TALLOC_FREE(ctx);
 700                 return -1;
 701         }
 702
 703         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 704                 d_fprintf(stderr, _("net usershare add: share name %s contains "
 705                         "invalid characters (any of %s)\n"),
 706                         sharename, INVALID_SHARENAME_CHARS);
 707                 TALLOC_FREE(ctx);
 708                 return -1;
 709         }
 710
 711         /* Disallow shares the same as users. */
 712         if (getpwnam(sharename)) {
 713                 d_fprintf(stderr,
 714                         _("net usershare add: share name %s is already a valid "
 715                           "system user name\n"),
 716                         sharename );
 717                 TALLOC_FREE(ctx);
 718                 return -1;
 719         }
 720
 721         /* Construct the full path for the usershare file. */
 722         full_path = get_basepath(ctx);
 723         if (!full_path) {
 724                 TALLOC_FREE(ctx);
 725                 return -1;
 726         }
 727         full_path_tmp = talloc_asprintf(ctx,
 728                         "%s/:tmpXXXXXX",
 729                         full_path);
 730         if (!full_path_tmp) {
 731                 TALLOC_FREE(ctx);
 732                 return -1;
 733         }
 734
 735         full_path = talloc_asprintf_append(full_path,
 736                                         "/%s",
 737                                         sharename);
 738         if (!full_path) {
 739                 TALLOC_FREE(ctx);
 740                 return -1;
 741         }
 742
 743         /* The path *must* be absolute. */
 744         if (us_path[0] != '/') {
 745                 d_fprintf(stderr,
 746                         _("net usershare add: path %s is not an absolute "
 747                           "path.\n"),
 748                         us_path);
 749                 TALLOC_FREE(ctx);
 750                 return -1;
 751         }
 752
 753         /* Check the directory to be shared exists. */
 754         if (sys_stat(us_path, &sbuf, lp_fake_dir_create_times()) != 0) {
 755                 d_fprintf(stderr,
 756                         _("net usershare add: cannot stat path %s to ensure "
 757                           "this is a directory. Error was %s\n"),
 758                         us_path, strerror(errno) );
 759                 TALLOC_FREE(ctx);
 760                 return -1;
 761         }
 762
 763         if (!S_ISDIR(sbuf.st_ex_mode)) {
 764                 d_fprintf(stderr,
 765                         _("net usershare add: path %s is not a directory.\n"),
 766                         us_path );
 767                 TALLOC_FREE(ctx);
 768                 return -1;
 769         }
 770
 771         /* If we're not root, check if we're restricted to sharing out directories
 772            that we own only. */
 773
 774         if ((myeuid != 0) && lp_usershare_owner_only() && (myeuid != sbuf.st_ex_uid)) {
 775                 d_fprintf(stderr, _("net usershare add: cannot share path %s as "
 776                         "we are restricted to only sharing directories we own.\n"
 777                         "\tAsk the administrator to add the line \"usershare owner only = false\" \n"
 778                         "\tto the [global] section of the smb.conf to allow this.\n"),
 779                         us_path );
 780                 TALLOC_FREE(ctx);
 781                 return -1;
 782         }
 783
 784         /* No validation needed on comment. Now go through and validate the
 785            acl string. Convert names to SID's as needed. Then run it through
 786            parse_usershare_acl to ensure it's valid. */
 787
 788         /* Start off the string we'll append to. */
 789         us_acl = talloc_strdup(ctx, "");
 790         if (!us_acl) {
 791                 TALLOC_FREE(ctx);
 792                 return -1;
 793         }
 794
 795         pacl = arg_acl;
 796         num_aces = 1;
 797
 798         /* Add the number of ',' characters to get the number of aces. */
 799         num_aces += count_chars(pacl,',');
 800
 801         for (i = 0; i < num_aces; i++) {
 802                 DOM_SID sid;
 803                 const char *pcolon = strchr_m(pacl, ':');
 804                 const char *name;
 805
 806                 if (pcolon == NULL) {
 807                         d_fprintf(stderr,
 808                                 _("net usershare add: malformed acl %s "
 809                                   "(missing ':').\n"),
 810                                 pacl );
 811                         TALLOC_FREE(ctx);
 812                         return -1;
 813                 }
 814
 815                 switch(pcolon[1]) {
 816                         case 'f':
 817                         case 'F':
 818                         case 'd':
 819                         case 'r':
 820                         case 'R':
 821                                 break;
 822                         default:
 823                                 d_fprintf(stderr,
 824                                         _("net usershare add: malformed acl %s "
 825                                           "(access control must be 'r', 'f', "
 826                                           "or 'd')\n"),
 827                                         pacl );
 828                                 TALLOC_FREE(ctx);
 829                                 return -1;
 830                 }
 831
 832                 if (pcolon[2] != ',' && pcolon[2] != '\0') {
 833                         d_fprintf(stderr,
 834                                 _("net usershare add: malformed terminating "
 835                                   "character for acl %s\n"),
 836                                 pacl );
 837                         TALLOC_FREE(ctx);
 838                         return -1;
 839                 }
 840
 841                 /* Get the name */
 842                 if ((name = talloc_strndup(ctx, pacl, pcolon - pacl)) == NULL) {
 843                         d_fprintf(stderr, _("talloc_strndup failed\n"));
 844                         TALLOC_FREE(ctx);
 845                         return -1;
 846                 }
 847                 if (!string_to_sid(&sid, name)) {
 848                         /* Convert to a SID */
 849                         NTSTATUS ntstatus = net_lookup_sid_from_name(c, ctx, name, &sid);
 850                         if (!NT_STATUS_IS_OK(ntstatus)) {
 851                                 d_fprintf(stderr,
 852                                         _("net usershare add: cannot convert "
 853                                           "name \"%s\" to a SID. %s."),
 854                                         name, get_friendly_nt_error_msg(ntstatus) );
 855                                 if (NT_STATUS_EQUAL(ntstatus, NT_STATUS_CONNECTION_REFUSED)) {
 856                                         d_fprintf(stderr,
 857                                             _(" Maybe smbd is not running.\n"));
 858                                 } else {
 859                                         d_fprintf(stderr, "\n");
 860                                 }
 861                                 TALLOC_FREE(ctx);
 862                                 return -1;
 863                         }
 864                 }
 865                 us_acl = talloc_asprintf_append(
 866                         us_acl, "%s:%c,", sid_string_tos(&sid), pcolon[1]);
 867
 868                 /* Move to the next ACL entry. */
 869                 if (pcolon[2] == ',') {
 870                         pacl = &pcolon[3];
 871                 }
 872         }
 873
 874         /* Remove the last ',' */
 875         us_acl[strlen(us_acl)-1] = '\0';
 876
 877         if (guest_ok && !lp_usershare_allow_guests()) {
 878                 d_fprintf(stderr, _("net usershare add: guest_ok=y requested "
 879                         "but the \"usershare allow guests\" parameter is not "
 880                         "enabled by this server.\n"));
 881                 TALLOC_FREE(ctx);
 882                 return -1;
 883         }
 884
 885         /* Create a temporary filename for this share. */
 886         tmpfd = mkstemp(full_path_tmp);
 887
 888         if (tmpfd == -1) {
 889                 d_fprintf(stderr,
 890                           _("net usershare add: cannot create tmp file %s\n"),
 891                           full_path_tmp );
 892                 TALLOC_FREE(ctx);
 893                 return -1;
 894         }
 895
 896         /* Ensure we opened the file we thought we did. */
 897         if (sys_lstat(full_path_tmp, &lsbuf, lp_fake_dir_create_times())
 898             != 0) {
 899                 d_fprintf(stderr,
 900                           _("net usershare add: cannot lstat tmp file %s\n"),
 901                           full_path_tmp );
 902                 TALLOC_FREE(ctx);
 903                 return -1;
 904         }
 905
 906         /* Check this is the same as the file we opened. */
 907         if (sys_fstat(tmpfd, &sbuf, lp_fake_dir_create_times()) != 0) {
 908                 d_fprintf(stderr,
 909                           _("net usershare add: cannot fstat tmp file %s\n"),
 910                           full_path_tmp );
 911                 TALLOC_FREE(ctx);
 912                 return -1;
 913         }
 914
 915         if (!S_ISREG(sbuf.st_ex_mode) || sbuf.st_ex_dev != lsbuf.st_ex_dev || sbuf.st_ex_ino != lsbuf.st_ex_ino) {
 916                 d_fprintf(stderr,
 917                           _("net usershare add: tmp file %s is not a regular "
 918                             "file ?\n"),
 919                           full_path_tmp );
 920                 TALLOC_FREE(ctx);
 921                 return -1;
 922         }
 923
 924         if (fchmod(tmpfd, 0644) == -1) {
 925                 d_fprintf(stderr,
 926                           _("net usershare add: failed to fchmod tmp file %s "
 927                             "to 0644n"),
 928                           full_path_tmp );
 929                 TALLOC_FREE(ctx);
 930                 return -1;
 931         }
 932
 933         /* Create the in-memory image of the file. */
 934         file_img = talloc_strdup(ctx, "#VERSION 2\npath=");
 935         file_img = talloc_asprintf_append(file_img, "%s\ncomment=%s\nusershare_acl=%s\nguest_ok=%c\n",
 936                         us_path, us_comment, us_acl, guest_ok ? 'y' : 'n');
 937
 938         to_write = strlen(file_img);
 939
 940         if (write(tmpfd, file_img, to_write) != to_write) {
 941                 d_fprintf(stderr,
 942                         _("net usershare add: failed to write %u bytes to "
 943                           "file %s. Error was %s\n"),
 944                         (unsigned int)to_write, full_path_tmp, strerror(errno));
 945                 unlink(full_path_tmp);
 946                 TALLOC_FREE(ctx);
 947                 return -1;
 948         }
 949
 950         /* Attempt to replace any existing share by this name. */
 951         if (rename(full_path_tmp, full_path) != 0) {
 952                 unlink(full_path_tmp);
 953                 d_fprintf(stderr,
 954                         _("net usershare add: failed to add share %s. Error "
 955                           "was %s\n"),
 956                         sharename, strerror(errno));
 957                 TALLOC_FREE(ctx);
 958                 close(tmpfd);
 959                 return -1;
 960         }
 961
 962         close(tmpfd);
 963
 964         if (c->opt_long_list_entries) {
 965                 const char *my_argv[2];
 966                 my_argv[0] = sharename;
 967                 my_argv[1] = NULL;
 968                 net_usershare_info(c, 1, my_argv);
 969         }
 970
 971         TALLOC_FREE(ctx);
 972         return 0;
 973 }
 974
 975 #if 0
 976 /***************************************************************************
 977  List function.
 978 ***************************************************************************/
 979
 980 static int list_fn(struct file_list *fl, void *priv)
 981 {
 982         d_printf("%s\n", fl->pathname);
 983         return 0;
 984 }
 985 #endif
 986
 987 /***************************************************************************
 988  List userlevel shares.
 989 ***************************************************************************/
 990
 991 static int net_usershare_list(struct net_context *c, int argc,
 992                               const char **argv)
 993 {
 994         fstring wcard;
 995         bool only_ours = true;
 996         int ret = -1;
 997         struct us_priv_info pi;
 998         TALLOC_CTX *ctx;
 999
1000         fstrcpy(wcard, "*");
1001
1002         if (c->display_usage)
1003                 return net_usershare_list_usage(c, argc, argv);
1004
1005         if (c->opt_long_list_entries) {
1006                 only_ours = false;
1007         }
1008
1009         switch (argc) {
1010                 case 0:
1011                         break;
1012                 case 1:
1013                         fstrcpy(wcard, argv[0]);
1014                         break;
1015                 default:
1016                         return net_usershare_list_usage(c, argc, argv);
1017         }
1018
1019         strlower_m(wcard);
1020
1021         ctx = talloc_init("share_list");
1022         ret = get_share_list(ctx, wcard, only_ours);
1023         if (ret) {
1024                 return ret;
1025         }
1026
1027         pi.ctx = ctx;
1028         pi.op = US_LIST_OP;
1029         pi.c = c;
1030
1031         ret = process_share_list(info_fn, &pi);
1032         talloc_destroy(ctx);
1033         return ret;
1034 }
1035
1036 /***************************************************************************
1037  Entry-point for all the USERSHARE functions.
1038 ***************************************************************************/
1039
1040 int net_usershare(struct net_context *c, int argc, const char **argv)
1041 {
1042         SMB_STRUCT_DIR *dp;
1043
1044         struct functable func[] = {
1045                 {
1046                         "add",
1047                         net_usershare_add,
1048                         NET_TRANSPORT_LOCAL,
1049                         N_("Add/modify user defined share"),
1050                         N_("net usershare add\n"
1051                            "    Add/modify user defined share")
1052                 },
1053                 {
1054                         "delete",
1055                         net_usershare_delete,
1056                         NET_TRANSPORT_LOCAL,
1057                         N_("Delete user defined share"),
1058                         N_("net usershare delete\n"
1059                            "    Delete user defined share")
1060                 },
1061                 {
1062                         "info",
1063                         net_usershare_info,
1064                         NET_TRANSPORT_LOCAL,
1065                         N_("Display information about a user defined share"),
1066                         N_("net usershare info\n"
1067                            "    Display information about a user defined share")
1068                 },
1069                 {
1070                         "list",
1071                         net_usershare_list,
1072                         NET_TRANSPORT_LOCAL,
1073                         N_("List user defined shares"),
1074                         N_("net usershare list\n"
1075                            "    List user defined shares")
1076                 },
1077                 {NULL, NULL, 0, NULL, NULL}
1078         };
1079
1080         if (lp_usershare_max_shares() == 0) {
1081                 d_fprintf(stderr,
1082                           _("net usershare: usershares are currently "
1083                             "disabled\n"));
1084                 return -1;
1085         }
1086
1087         dp = sys_opendir(lp_usershare_path());
1088         if (!dp) {
1089                 int err = errno;
1090                 d_fprintf(stderr,
1091                         _("net usershare: cannot open usershare directory %s. "
1092                           "Error %s\n"),
1093                         lp_usershare_path(), strerror(err) );
1094                 if (err == EACCES) {
1095                         d_fprintf(stderr,
1096                                 _("You do not have permission to create a "
1097                                 "usershare. Ask your administrator to grant "
1098                                 "you permissions to create a share.\n"));
1099                 } else if (err == ENOENT) {
1100                         d_fprintf(stderr,
1101                                 _("Please ask your system administrator to "
1102                                   "enable user sharing.\n"));
1103                 }
1104                 return -1;
1105         }
1106         sys_closedir(dp);
1107
1108         return net_run_function(c, argc, argv, "net usershare", func);
1109 }