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 "system/passwd.h"
  23 #include "system/filesys.h"
  24 #include "utils/net.h"
  25 #include "../libcli/security/security.h"
  26
  27 struct {
  28         const char *us_errstr;
  29         enum usershare_err us_err;
  30 } us_errs [] = {
  31         {"",USERSHARE_OK},
  32         {N_("Malformed usershare file"), USERSHARE_MALFORMED_FILE},
  33         {N_("Bad version number"), USERSHARE_BAD_VERSION},
  34         {N_("Malformed path entry"), USERSHARE_MALFORMED_PATH},
  35         {N_("Malformed comment entryfile"), USERSHARE_MALFORMED_COMMENT_DEF},
  36         {N_("Malformed acl definition"), USERSHARE_MALFORMED_ACL_DEF},
  37         {N_("Acl parse error"), USERSHARE_ACL_ERR},
  38         {N_("Path not absolute"), USERSHARE_PATH_NOT_ABSOLUTE},
  39         {N_("Path is denied"), USERSHARE_PATH_IS_DENIED},
  40         {N_("Path not allowed"), USERSHARE_PATH_NOT_ALLOWED},
  41         {N_("Path is not a directory"), USERSHARE_PATH_NOT_DIRECTORY},
  42         {N_("System error"), USERSHARE_POSIX_ERR},
  43         {N_("Malformed sharename definition"), USERSHARE_MALFORMED_SHARENAME_DEF},
  44         {N_("Bad sharename (doesn't match filename)"), USERSHARE_BAD_SHARENAME},
  45         {NULL,(enum usershare_err)-1}
  46 };
  47
  48 static const char *get_us_error_code(enum usershare_err us_err)
  49 {
  50         char *result;
  51         int idx = 0;
  52
  53         while (us_errs[idx].us_errstr != NULL) {
  54                 if (us_errs[idx].us_err == us_err) {
  55                         return us_errs[idx].us_errstr;
  56                 }
  57                 idx++;
  58         }
  59
  60         result = talloc_asprintf(talloc_tos(), _("Usershare error code (0x%x)"),
  61                                  (unsigned int)us_err);
  62         SMB_ASSERT(result != NULL);
  63         return result;
  64 }
  65
  66 /* The help subsystem for the USERSHARE subcommand */
  67
  68 static int net_usershare_add_usage(struct net_context *c, int argc, const char **argv)
  69 {
  70         char chr = *lp_winbind_separator();
  71         d_printf(_(
  72                 "net usershare add [-l|--long] <sharename> <path> [<comment>] [<acl>] [<guest_ok=[y|n]>]\n"
  73                 "\tAdds the specified share name for this user.\n"
  74                 "\t<sharename> is the new share name.\n"
  75                 "\t<path> is the path on the filesystem to export.\n"
  76                 "\t<comment> is the optional comment for the new share.\n"
  77                 "\t<acl> is an optional share acl in the format \"DOMAIN%cname:X,DOMAIN%cname:X,....\"\n"
  78                 "\t<guest_ok=y> if present sets \"guest ok = yes\" on this usershare.\n"
  79                 "\t\t\"X\" represents a permission and can be any one of the characters f, r or d\n"
  80                 "\t\twhere \"f\" means full control, \"r\" means read-only, \"d\" means deny access.\n"
  81                 "\t\tname may be a domain user or group. For local users use the local server name "
  82                 "instead of \"DOMAIN\"\n"
  83                 "\t\tThe default acl is \"Everyone:r\" which allows everyone read-only access.\n"
  84                 "\tAdd -l or --long to print the info on the newly added share.\n"),
  85                 chr, chr );
  86         return -1;
  87 }
  88
  89 static int net_usershare_delete_usage(struct net_context *c, int argc, const char **argv)
  90 {
  91         d_printf(_(
  92                 "net usershare delete <sharename>\n"
  93                 "\tdeletes the specified share name for this user.\n"));
  94         return -1;
  95 }
  96
  97 static int net_usershare_info_usage(struct net_context *c, int argc, const char **argv)
  98 {
  99         d_printf(_(
 100                 "net usershare info [-l|--long] [wildcard sharename]\n"
 101                 "\tPrints out the path, comment and acl elements of shares that match the wildcard.\n"
 102                 "\tBy default only gives info on shares owned by the current user\n"
 103                 "\tAdd -l or --long to apply this to all shares\n"
 104                 "\tOmit the sharename or use a wildcard of '*' to see all shares\n"));
 105         return -1;
 106 }
 107
 108 static int net_usershare_list_usage(struct net_context *c, int argc, const char **argv)
 109 {
 110         d_printf(_(
 111                 "net usershare list [-l|--long] [wildcard sharename]\n"
 112                 "\tLists the names of all shares that match the wildcard.\n"
 113                 "\tBy default only lists shares owned by the current user\n"
 114                 "\tAdd -l or --long to apply this to all shares\n"
 115                 "\tOmit the sharename or use a wildcard of '*' to see all shares\n"));
 116         return -1;
 117 }
 118
 119 int net_usershare_usage(struct net_context *c, int argc, const char **argv)
 120 {
 121         d_printf(_("net usershare add <sharename> <path> [<comment>] [<acl>] [<guest_ok=[y|n]>] to "
 122                                 "add or change a user defined share.\n"
 123                 "net usershare delete <sharename> to delete a user defined share.\n"
 124                 "net usershare info [-l|--long] [wildcard sharename] to print info about a user defined share.\n"
 125                 "net usershare list [-l|--long] [wildcard sharename] to list user defined shares.\n"
 126                 "net usershare help\n"
 127                 "\nType \"net usershare help <option>\" to get more information on that option\n\n"));
 128
 129         net_common_flags_usage(c, argc, argv);
 130         return -1;
 131 }
 132
 133 /***************************************************************************
 134 ***************************************************************************/
 135
 136 static char *get_basepath(TALLOC_CTX *ctx)
 137 {
 138         const struct loadparm_substitution *lp_sub =
 139                 loadparm_s3_global_substitution();
 140         char *basepath = lp_usershare_path(ctx, lp_sub);
 141
 142         if (!basepath) {
 143                 return NULL;
 144         }
 145         if ((basepath[0] != '\0') && (basepath[strlen(basepath)-1] == '/')) {
 146                 basepath[strlen(basepath)-1] = '\0';
 147         }
 148         return basepath;
 149 }
 150
 151 /***************************************************************************
 152  Delete a single userlevel share.
 153 ***************************************************************************/
 154
 155 static int net_usershare_delete(struct net_context *c, int argc, const char **argv)
 156 {
 157         const struct loadparm_substitution *lp_sub =
 158                 loadparm_s3_global_substitution();
 159         char *us_path;
 160         char *sharename;
 161
 162         if (argc != 1 || c->display_usage) {
 163                 return net_usershare_delete_usage(c, argc, argv);
 164         }
 165
 166         if ((sharename = strlower_talloc(talloc_tos(), argv[0])) == NULL) {
 167                 d_fprintf(stderr, _("strlower_talloc failed\n"));
 168                 return -1;
 169         }
 170
 171         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 172                 d_fprintf(stderr, _("net usershare delete: share name %s contains "
 173                         "invalid characters (any of %s)\n"),
 174                         sharename, INVALID_SHARENAME_CHARS);
 175                 TALLOC_FREE(sharename);
 176                 return -1;
 177         }
 178
 179         us_path = talloc_asprintf(talloc_tos(),
 180                                 "%s/%s",
 181                                 lp_usershare_path(talloc_tos(), lp_sub),
 182                                 sharename);
 183         if (!us_path) {
 184                 TALLOC_FREE(sharename);
 185                 return -1;
 186         }
 187
 188         if (unlink(us_path) != 0) {
 189                 d_fprintf(stderr, _("net usershare delete: unable to remove usershare %s. "
 190                         "Error was %s\n"),
 191                         us_path, strerror(errno));
 192                 TALLOC_FREE(sharename);
 193                 return -1;
 194         }
 195         TALLOC_FREE(sharename);
 196         return 0;
 197 }
 198
 199 /***************************************************************************
 200  Data structures to handle a list of usershare files.
 201 ***************************************************************************/
 202
 203 struct file_list {
 204         struct file_list *next, *prev;
 205         const char *pathname;
 206 };
 207
 208 static struct file_list *flist;
 209
 210 /***************************************************************************
 211 ***************************************************************************/
 212
 213 static int get_share_list(TALLOC_CTX *ctx, const char *wcard, bool only_ours)
 214 {
 215         DIR *dp;
 216         struct dirent *de;
 217         uid_t myuid = geteuid();
 218         struct file_list *fl = NULL;
 219         char *basepath = get_basepath(ctx);
 220
 221         if (!basepath) {
 222                 return -1;
 223         }
 224         dp = opendir(basepath);
 225         if (!dp) {
 226                 d_fprintf(stderr,
 227                         _("get_share_list: cannot open usershare directory %s. "
 228                           "Error %s\n"),
 229                         basepath, strerror(errno) );
 230                 return -1;
 231         }
 232
 233         while((de = readdir(dp)) != 0) {
 234                 SMB_STRUCT_STAT sbuf;
 235                 char *path;
 236                 const char *n = de->d_name;
 237
 238                 /* Ignore . and .. */
 239                 if (*n == '.') {
 240                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 241                                 continue;
 242                         }
 243                 }
 244
 245                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 246                         d_fprintf(stderr,
 247                                   _("get_share_list: ignoring bad share "
 248                                     "name %s\n"), n);
 249                         continue;
 250                 }
 251                 path = talloc_asprintf(ctx,
 252                                         "%s/%s",
 253                                         basepath,
 254                                         n);
 255                 if (!path) {
 256                         closedir(dp);
 257                         return -1;
 258                 }
 259
 260                 if (sys_lstat(path, &sbuf, false) != 0) {
 261                         d_fprintf(stderr,
 262                                 _("get_share_list: can't lstat file %s. Error "
 263                                   "was %s\n"),
 264                                 path, strerror(errno) );
 265                         continue;
 266                 }
 267
 268                 if (!S_ISREG(sbuf.st_ex_mode)) {
 269                         d_fprintf(stderr,
 270                                   _("get_share_list: file %s is not a regular "
 271                                     "file. Ignoring.\n"),
 272                                 path );
 273                         continue;
 274                 }
 275
 276                 if (only_ours && sbuf.st_ex_uid != myuid) {
 277                         continue;
 278                 }
 279
 280                 if (!unix_wild_match(wcard, n)) {
 281                         continue;
 282                 }
 283
 284                 /* (Finally) - add to list. */
 285                 fl = talloc(ctx, struct file_list);
 286                 if (!fl) {
 287                         closedir(dp);
 288                         return -1;
 289                 }
 290                 fl->pathname = talloc_strdup(ctx, n);
 291                 if (!fl->pathname) {
 292                         closedir(dp);
 293                         return -1;
 294                 }
 295
 296                 DLIST_ADD(flist, fl);
 297         }
 298
 299         closedir(dp);
 300         return 0;
 301 }
 302
 303 enum us_priv_op { US_LIST_OP, US_INFO_OP};
 304
 305 struct us_priv_info {
 306         TALLOC_CTX *ctx;
 307         enum us_priv_op op;
 308         struct net_context *c;
 309 };
 310
 311 /***************************************************************************
 312  Call a function for every share on the list.
 313 ***************************************************************************/
 314
 315 static int process_share_list(int (*fn)(struct file_list *, void *), void *priv)
 316 {
 317         struct file_list *fl;
 318         int ret = 0;
 319
 320         for (fl = flist; fl; fl = fl->next) {
 321                 ret = (*fn)(fl, priv);
 322         }
 323
 324         return ret;
 325 }
 326
 327 /***************************************************************************
 328  Info function.
 329 ***************************************************************************/
 330
 331 static int info_fn(struct file_list *fl, void *priv)
 332 {
 333         SMB_STRUCT_STAT sbuf;
 334         char **lines = NULL;
 335         struct us_priv_info *pi = (struct us_priv_info *)priv;
 336         TALLOC_CTX *ctx = pi->ctx;
 337         struct net_context *c = pi->c;
 338         int fd = -1;
 339         int numlines = 0;
 340         struct security_descriptor *psd = NULL;
 341         char *basepath;
 342         char *sharepath = NULL;
 343         char *comment = NULL;
 344         char *cp_sharename = NULL;
 345         char *acl_str;
 346         int num_aces;
 347         char sep_str[2];
 348         enum usershare_err us_err;
 349         bool guest_ok = false;
 350
 351         sep_str[0] = *lp_winbind_separator();
 352         sep_str[1] = '\0';
 353
 354         basepath = get_basepath(ctx);
 355         if (!basepath) {
 356                 return -1;
 357         }
 358         basepath = talloc_asprintf_append(basepath,
 359                         "/%s",
 360                         fl->pathname);
 361         if (!basepath) {
 362                 return -1;
 363         }
 364
 365 #ifdef O_NOFOLLOW
 366         fd = open(basepath, O_RDONLY|O_NOFOLLOW, 0);
 367 #else
 368         fd = open(basepath, O_RDONLY, 0);
 369 #endif
 370
 371         if (fd == -1) {
 372                 d_fprintf(stderr, _("info_fn: unable to open %s. %s\n"),
 373                         basepath, strerror(errno) );
 374                 return -1;
 375         }
 376
 377         /* Paranoia... */
 378         if (sys_fstat(fd, &sbuf, false) != 0) {
 379                 d_fprintf(stderr,
 380                         _("info_fn: can't fstat file %s. Error was %s\n"),
 381                         basepath, strerror(errno) );
 382                 close(fd);
 383                 return -1;
 384         }
 385
 386         if (!S_ISREG(sbuf.st_ex_mode)) {
 387                 d_fprintf(stderr,
 388                         _("info_fn: file %s is not a regular file. Ignoring.\n"),
 389                         basepath );
 390                 close(fd);
 391                 return -1;
 392         }
 393
 394         lines = fd_lines_load(fd, &numlines, 10240, NULL);
 395         close(fd);
 396
 397         if (lines == NULL) {
 398                 return -1;
 399         }
 400
 401         /* Ensure it's well formed. */
 402         us_err = parse_usershare_file(ctx, &sbuf, fl->pathname, -1, lines, numlines,
 403                                 &sharepath,
 404                                 &comment,
 405                                 &cp_sharename,
 406                                 &psd,
 407                                 &guest_ok);
 408
 409         TALLOC_FREE(lines);
 410
 411         if (us_err != USERSHARE_OK) {
 412                 d_fprintf(stderr,
 413                         _("info_fn: file %s is not a well formed usershare "
 414                           "file.\n"),
 415                         basepath );
 416                 d_fprintf(stderr, _("info_fn: Error was %s.\n"),
 417                         get_us_error_code(us_err) );
 418                 return -1;
 419         }
 420
 421         acl_str = talloc_strdup(ctx, "usershare_acl=");
 422         if (!acl_str) {
 423                 return -1;
 424         }
 425
 426         for (num_aces = 0; num_aces < psd->dacl->num_aces; num_aces++) {
 427                 const char *domain;
 428                 const char *name;
 429                 NTSTATUS ntstatus;
 430
 431                 ntstatus = net_lookup_name_from_sid(c, ctx,
 432                                                     &psd->dacl->aces[num_aces].trustee,
 433                                                     &domain, &name);
 434
 435                 if (NT_STATUS_IS_OK(ntstatus)) {
 436                         if (domain && *domain) {
 437                                 acl_str = talloc_asprintf_append(acl_str,
 438                                                 "%s%s",
 439                                                 domain,
 440                                                 sep_str);
 441                                 if (!acl_str) {
 442                                         return -1;
 443                                 }
 444                         }
 445                         acl_str = talloc_asprintf_append(acl_str,
 446                                                 "%s",
 447                                                 name);
 448                         if (!acl_str) {
 449                                 return -1;
 450                         }
 451
 452                 } else {
 453                         struct dom_sid_buf sidstr;
 454
 455                         acl_str = talloc_asprintf_append(
 456                                 acl_str,
 457                                 "%s",
 458                                 dom_sid_str_buf(
 459                                         &psd->dacl->aces[num_aces].trustee,
 460                                         &sidstr));
 461                         if (!acl_str) {
 462                                 return -1;
 463                         }
 464                 }
 465                 acl_str = talloc_asprintf_append(acl_str, ":");
 466                 if (!acl_str) {
 467                         return -1;
 468                 }
 469
 470                 if (psd->dacl->aces[num_aces].type == SEC_ACE_TYPE_ACCESS_DENIED) {
 471                         acl_str = talloc_asprintf_append(acl_str, "D,");
 472                         if (!acl_str) {
 473                                 return -1;
 474                         }
 475                 } else {
 476                         if (psd->dacl->aces[num_aces].access_mask & GENERIC_ALL_ACCESS) {
 477                                 acl_str = talloc_asprintf_append(acl_str, "F,");
 478                         } else {
 479                                 acl_str = talloc_asprintf_append(acl_str, "R,");
 480                         }
 481                         if (!acl_str) {
 482                                 return -1;
 483                         }
 484                 }
 485         }
 486
 487         /* NOTE: This is smb.conf-like output. Do not translate. */
 488         if (pi->op == US_INFO_OP) {
 489                 d_printf("[%s]\n", cp_sharename );
 490                 d_printf("path=%s\n", sharepath );
 491                 d_printf("comment=%s\n", comment);
 492                 d_printf("%s\n", acl_str);
 493                 d_printf("guest_ok=%c\n\n", guest_ok ? 'y' : 'n');
 494         } else if (pi->op == US_LIST_OP) {
 495                 d_printf("%s\n", cp_sharename);
 496         }
 497
 498         return 0;
 499 }
 500
 501 /***************************************************************************
 502  Print out info (internal detail) on userlevel shares.
 503 ***************************************************************************/
 504
 505 static int net_usershare_info(struct net_context *c, int argc, const char **argv)
 506 {
 507         fstring wcard;
 508         bool only_ours = true;
 509         int ret = -1;
 510         struct us_priv_info pi;
 511         TALLOC_CTX *ctx;
 512
 513         fstrcpy(wcard, "*");
 514
 515         if (c->display_usage)
 516                 return net_usershare_info_usage(c, argc, argv);
 517
 518         if (c->opt_long_list_entries) {
 519                 only_ours = false;
 520         }
 521
 522         switch (argc) {
 523                 case 0:
 524                         break;
 525                 case 1:
 526                         fstrcpy(wcard, argv[0]);
 527                         break;
 528                 default:
 529                         return net_usershare_info_usage(c, argc, argv);
 530         }
 531
 532         if (!strlower_m(wcard)) {
 533                 return -1;
 534         }
 535
 536         ctx = talloc_init("share_info");
 537         ret = get_share_list(ctx, wcard, only_ours);
 538         if (ret) {
 539                 return ret;
 540         }
 541
 542         pi.ctx = ctx;
 543         pi.op = US_INFO_OP;
 544         pi.c = c;
 545
 546         ret = process_share_list(info_fn, &pi);
 547         talloc_destroy(ctx);
 548         return ret;
 549 }
 550
 551 /***************************************************************************
 552  Count the current total number of usershares.
 553 ***************************************************************************/
 554
 555 static int count_num_usershares(void)
 556 {
 557         DIR *dp;
 558         struct dirent *de;
 559         int num_usershares = 0;
 560         TALLOC_CTX *ctx = talloc_tos();
 561         char *basepath = get_basepath(ctx);
 562
 563         if (!basepath) {
 564                 return -1;
 565         }
 566
 567         dp = opendir(basepath);
 568         if (!dp) {
 569                 d_fprintf(stderr,
 570                         _("count_num_usershares: cannot open usershare "
 571                           "directory %s. Error %s\n"),
 572                         basepath, strerror(errno) );
 573                 return -1;
 574         }
 575
 576         while((de = readdir(dp)) != 0) {
 577                 SMB_STRUCT_STAT sbuf;
 578                 char *path;
 579                 const char *n = de->d_name;
 580
 581                 /* Ignore . and .. */
 582                 if (*n == '.') {
 583                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 584                                 continue;
 585                         }
 586                 }
 587
 588                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 589                         d_fprintf(stderr,
 590                                   _("count_num_usershares: ignoring bad share "
 591                                     "name %s\n"), n);
 592                         continue;
 593                 }
 594                 path = talloc_asprintf(ctx,
 595                                 "%s/%s",
 596                                 basepath,
 597                                 n);
 598                 if (!path) {
 599                         closedir(dp);
 600                         return -1;
 601                 }
 602
 603                 if (sys_lstat(path, &sbuf, false) != 0) {
 604                         d_fprintf(stderr,
 605                                 _("count_num_usershares: can't lstat file %s. "
 606                                   "Error was %s\n"),
 607                                 path, strerror(errno) );
 608                         continue;
 609                 }
 610
 611                 if (!S_ISREG(sbuf.st_ex_mode)) {
 612                         d_fprintf(stderr,
 613                                 _("count_num_usershares: file %s is not a "
 614                                   "regular file. Ignoring.\n"),
 615                                 path );
 616                         continue;
 617                 }
 618                 num_usershares++;
 619         }
 620
 621         closedir(dp);
 622         return num_usershares;
 623 }
 624
 625 /***************************************************************************
 626  Add a single userlevel share.
 627 ***************************************************************************/
 628
 629 static int net_usershare_add(struct net_context *c, int argc, const char **argv)
 630 {
 631         TALLOC_CTX *ctx = talloc_stackframe();
 632         SMB_STRUCT_STAT sbuf;
 633         SMB_STRUCT_STAT lsbuf;
 634         char *sharename;
 635         const char *cp_sharename;
 636         char *full_path;
 637         char *full_path_tmp;
 638         const char *us_path;
 639         const char *us_comment;
 640         const char *arg_acl;
 641         char *us_acl;
 642         char *file_img;
 643         int num_aces = 0;
 644         int i;
 645         int tmpfd;
 646         const char *pacl;
 647         size_t to_write;
 648         uid_t myeuid = geteuid();
 649         bool guest_ok = false;
 650         int num_usershares;
 651         mode_t mask;
 652
 653         us_comment = "";
 654         arg_acl = "S-1-1-0:R";
 655
 656         if (c->display_usage) {
 657                 TALLOC_FREE(ctx);
 658                 return net_usershare_add_usage(c, argc, argv);
 659         }
 660
 661         switch (argc) {
 662                 case 0:
 663                 case 1:
 664                 default:
 665                         TALLOC_FREE(ctx);
 666                         return net_usershare_add_usage(c, argc, argv);
 667                 case 2:
 668                         cp_sharename = argv[0];
 669                         sharename = strlower_talloc(ctx, argv[0]);
 670                         us_path = argv[1];
 671                         break;
 672                 case 3:
 673                         cp_sharename = argv[0];
 674                         sharename = strlower_talloc(ctx, argv[0]);
 675                         us_path = argv[1];
 676                         us_comment = argv[2];
 677                         break;
 678                 case 4:
 679                         cp_sharename = argv[0];
 680                         sharename = strlower_talloc(ctx, argv[0]);
 681                         us_path = argv[1];
 682                         us_comment = argv[2];
 683                         arg_acl = argv[3];
 684                         break;
 685                 case 5:
 686                         cp_sharename = argv[0];
 687                         sharename = strlower_talloc(ctx, argv[0]);
 688                         us_path = argv[1];
 689                         us_comment = argv[2];
 690                         arg_acl = argv[3];
 691                         if (strlen(arg_acl) == 0) {
 692                                 arg_acl = "S-1-1-0:R";
 693                         }
 694                         if (!strnequal(argv[4], "guest_ok=", 9)) {
 695                                 TALLOC_FREE(ctx);
 696                                 return net_usershare_add_usage(c, argc, argv);
 697                         }
 698                         switch (argv[4][9]) {
 699                                 case 'y':
 700                                 case 'Y':
 701                                         guest_ok = true;
 702                                         break;
 703                                 case 'n':
 704                                 case 'N':
 705                                         guest_ok = false;
 706                                         break;
 707                                 default:
 708                                         TALLOC_FREE(ctx);
 709                                         return net_usershare_add_usage(c, argc, argv);
 710                         }
 711                         break;
 712         }
 713
 714         /* Ensure we're under the "usershare max shares" number. Advisory only. */
 715         num_usershares = count_num_usershares();
 716         if (num_usershares >= lp_usershare_max_shares()) {
 717                 d_fprintf(stderr,
 718                         _("net usershare add: maximum number of allowed "
 719                           "usershares (%d) reached\n"),
 720                         lp_usershare_max_shares() );
 721                 TALLOC_FREE(ctx);
 722                 return -1;
 723         }
 724
 725         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 726                 d_fprintf(stderr, _("net usershare add: share name %s contains "
 727                         "invalid characters (any of %s)\n"),
 728                         sharename, INVALID_SHARENAME_CHARS);
 729                 TALLOC_FREE(ctx);
 730                 return -1;
 731         }
 732
 733         /* Disallow shares the same as users. */
 734         if (getpwnam(sharename)) {
 735                 d_fprintf(stderr,
 736                         _("net usershare add: share name %s is already a valid "
 737                           "system user name\n"),
 738                         sharename );
 739                 TALLOC_FREE(ctx);
 740                 return -1;
 741         }
 742
 743         /* Construct the full path for the usershare file. */
 744         full_path = get_basepath(ctx);
 745         if (!full_path) {
 746                 TALLOC_FREE(ctx);
 747                 return -1;
 748         }
 749         full_path_tmp = talloc_asprintf(ctx,
 750                         "%s/:tmpXXXXXX",
 751                         full_path);
 752         if (!full_path_tmp) {
 753                 TALLOC_FREE(ctx);
 754                 return -1;
 755         }
 756
 757         full_path = talloc_asprintf_append(full_path,
 758                                         "/%s",
 759                                         sharename);
 760         if (!full_path) {
 761                 TALLOC_FREE(ctx);
 762                 return -1;
 763         }
 764
 765         /* The path *must* be absolute. */
 766         if (us_path[0] != '/') {
 767                 d_fprintf(stderr,
 768                         _("net usershare add: path %s is not an absolute "
 769                           "path.\n"),
 770                         us_path);
 771                 TALLOC_FREE(ctx);
 772                 return -1;
 773         }
 774
 775         /* Check the directory to be shared exists. */
 776         if (sys_stat(us_path, &sbuf, false) != 0) {
 777                 d_fprintf(stderr,
 778                         _("net usershare add: cannot stat path %s to ensure "
 779                           "this is a directory. Error was %s\n"),
 780                         us_path, strerror(errno) );
 781                 TALLOC_FREE(ctx);
 782                 return -1;
 783         }
 784
 785         if (!S_ISDIR(sbuf.st_ex_mode)) {
 786                 d_fprintf(stderr,
 787                         _("net usershare add: path %s is not a directory.\n"),
 788                         us_path );
 789                 TALLOC_FREE(ctx);
 790                 return -1;
 791         }
 792
 793         /* If we're not root, check if we're restricted to sharing out directories
 794            that we own only. */
 795
 796         if ((myeuid != 0) && lp_usershare_owner_only() && (myeuid != sbuf.st_ex_uid)) {
 797                 d_fprintf(stderr, _("net usershare add: cannot share path %s as "
 798                         "we are restricted to only sharing directories we own.\n"
 799                         "\tAsk the administrator to add the line \"usershare owner only = false\" \n"
 800                         "\tto the [global] section of the smb.conf to allow this.\n"),
 801                         us_path );
 802                 TALLOC_FREE(ctx);
 803                 return -1;
 804         }
 805
 806         /* No validation needed on comment. Now go through and validate the
 807            acl string. Convert names to SID's as needed. Then run it through
 808            parse_usershare_acl to ensure it's valid. */
 809
 810         /* Start off the string we'll append to. */
 811         us_acl = talloc_strdup(ctx, "");
 812         if (!us_acl) {
 813                 TALLOC_FREE(ctx);
 814                 return -1;
 815         }
 816
 817         pacl = arg_acl;
 818         num_aces = 1;
 819
 820         /* Add the number of ',' characters to get the number of aces. */
 821         num_aces += count_chars(pacl,',');
 822
 823         for (i = 0; i < num_aces; i++) {
 824                 struct dom_sid sid;
 825                 struct dom_sid_buf buf;
 826                 const char *pcolon = strchr_m(pacl, ':');
 827                 const char *name;
 828
 829                 if (pcolon == NULL) {
 830                         d_fprintf(stderr,
 831                                 _("net usershare add: malformed acl %s "
 832                                   "(missing ':').\n"),
 833                                 pacl );
 834                         TALLOC_FREE(ctx);
 835                         return -1;
 836                 }
 837
 838                 switch(pcolon[1]) {
 839                         case 'f':
 840                         case 'F':
 841                         case 'd':
 842                         case 'r':
 843                         case 'R':
 844                                 break;
 845                         default:
 846                                 d_fprintf(stderr,
 847                                         _("net usershare add: malformed acl %s "
 848                                           "(access control must be 'r', 'f', "
 849                                           "or 'd')\n"),
 850                                         pacl );
 851                                 TALLOC_FREE(ctx);
 852                                 return -1;
 853                 }
 854
 855                 if (pcolon[2] != ',' && pcolon[2] != '\0') {
 856                         d_fprintf(stderr,
 857                                 _("net usershare add: malformed terminating "
 858                                   "character for acl %s\n"),
 859                                 pacl );
 860                         TALLOC_FREE(ctx);
 861                         return -1;
 862                 }
 863
 864                 /* Get the name */
 865                 if ((name = talloc_strndup(ctx, pacl, pcolon - pacl)) == NULL) {
 866                         d_fprintf(stderr, _("talloc_strndup failed\n"));
 867                         TALLOC_FREE(ctx);
 868                         return -1;
 869                 }
 870                 if (!string_to_sid(&sid, name)) {
 871                         /* Convert to a SID */
 872                         NTSTATUS ntstatus = net_lookup_sid_from_name(c, ctx, name, &sid);
 873                         if (!NT_STATUS_IS_OK(ntstatus)) {
 874                                 d_fprintf(stderr,
 875                                         _("net usershare add: cannot convert "
 876                                           "name \"%s\" to a SID. %s."),
 877                                         name, get_friendly_nt_error_msg(ntstatus) );
 878                                 if (NT_STATUS_EQUAL(ntstatus, NT_STATUS_CONNECTION_REFUSED)) {
 879                                         d_fprintf(stderr,
 880                                             _(" Maybe smbd is not running.\n"));
 881                                 } else {
 882                                         d_fprintf(stderr, "\n");
 883                                 }
 884                                 TALLOC_FREE(ctx);
 885                                 return -1;
 886                         }
 887                 }
 888                 us_acl = talloc_asprintf_append(
 889                         us_acl,
 890                         "%s:%c,",
 891                         dom_sid_str_buf(&sid, &buf),
 892                         pcolon[1]);
 893
 894                 /* Move to the next ACL entry. */
 895                 if (pcolon[2] == ',') {
 896                         pacl = &pcolon[3];
 897                 }
 898         }
 899
 900         /* Remove the last ',' */
 901         us_acl[strlen(us_acl)-1] = '\0';
 902
 903         if (guest_ok && !lp_usershare_allow_guests()) {
 904                 d_fprintf(stderr, _("net usershare add: guest_ok=y requested "
 905                         "but the \"usershare allow guests\" parameter is not "
 906                         "enabled by this server.\n"));
 907                 TALLOC_FREE(ctx);
 908                 return -1;
 909         }
 910
 911         /* Create a temporary filename for this share. */
 912         mask = umask(S_IRWXO | S_IRWXG);
 913         tmpfd = mkstemp(full_path_tmp);
 914         umask(mask);
 915
 916         if (tmpfd == -1) {
 917                 d_fprintf(stderr,
 918                           _("net usershare add: cannot create tmp file %s\n"),
 919                           full_path_tmp );
 920                 TALLOC_FREE(ctx);
 921                 return -1;
 922         }
 923
 924         /* Ensure we opened the file we thought we did. */
 925         if (sys_lstat(full_path_tmp, &lsbuf, false) != 0) {
 926                 d_fprintf(stderr,
 927                           _("net usershare add: cannot lstat tmp file %s\n"),
 928                           full_path_tmp );
 929                 TALLOC_FREE(ctx);
 930                 close(tmpfd);
 931                 return -1;
 932         }
 933
 934         /* Check this is the same as the file we opened. */
 935         if (sys_fstat(tmpfd, &sbuf, false) != 0) {
 936                 d_fprintf(stderr,
 937                           _("net usershare add: cannot fstat tmp file %s\n"),
 938                           full_path_tmp );
 939                 TALLOC_FREE(ctx);
 940                 close(tmpfd);
 941                 return -1;
 942         }
 943
 944         if (!S_ISREG(sbuf.st_ex_mode) || sbuf.st_ex_dev != lsbuf.st_ex_dev || sbuf.st_ex_ino != lsbuf.st_ex_ino) {
 945                 d_fprintf(stderr,
 946                           _("net usershare add: tmp file %s is not a regular "
 947                             "file ?\n"),
 948                           full_path_tmp );
 949                 TALLOC_FREE(ctx);
 950                 close(tmpfd);
 951                 return -1;
 952         }
 953
 954         if (fchmod(tmpfd, 0644) == -1) {
 955                 d_fprintf(stderr,
 956                           _("net usershare add: failed to fchmod tmp file %s "
 957                             "to 0644n"),
 958                           full_path_tmp );
 959                 TALLOC_FREE(ctx);
 960                 close(tmpfd);
 961                 return -1;
 962         }
 963
 964         /* Create the in-memory image of the file. */
 965         file_img = talloc_strdup(ctx, "#VERSION 2\npath=");
 966         file_img = talloc_asprintf_append(file_img,
 967                         "%s\ncomment=%s\nusershare_acl=%s\n"
 968                         "guest_ok=%c\nsharename=%s\n",
 969                         us_path,
 970                         us_comment,
 971                         us_acl,
 972                         guest_ok ? 'y' : 'n',
 973                         cp_sharename);
 974
 975         to_write = strlen(file_img);
 976
 977         if (write(tmpfd, file_img, to_write) != to_write) {
 978                 d_fprintf(stderr,
 979                         _("net usershare add: failed to write %u bytes to "
 980                           "file %s. Error was %s\n"),
 981                         (unsigned int)to_write, full_path_tmp, strerror(errno));
 982                 unlink(full_path_tmp);
 983                 TALLOC_FREE(ctx);
 984                 close(tmpfd);
 985                 return -1;
 986         }
 987
 988         /* Attempt to replace any existing share by this name. */
 989         if (rename(full_path_tmp, full_path) != 0) {
 990                 unlink(full_path_tmp);
 991                 d_fprintf(stderr,
 992                         _("net usershare add: failed to add share %s. Error "
 993                           "was %s\n"),
 994                         sharename, strerror(errno));
 995                 TALLOC_FREE(ctx);
 996                 close(tmpfd);
 997                 return -1;
 998         }
 999
1000         close(tmpfd);
1001
1002         if (c->opt_long_list_entries) {
1003                 const char *my_argv[2];
1004                 my_argv[0] = sharename;
1005                 my_argv[1] = NULL;
1006                 net_usershare_info(c, 1, my_argv);
1007         }
1008
1009         TALLOC_FREE(ctx);
1010         return 0;
1011 }
1012
1013 #if 0
1014 /***************************************************************************
1015  List function.
1016 ***************************************************************************/
1017
1018 static int list_fn(struct file_list *fl, void *priv)
1019 {
1020         d_printf("%s\n", fl->pathname);
1021         return 0;
1022 }
1023 #endif
1024
1025 /***************************************************************************
1026  List userlevel shares.
1027 ***************************************************************************/
1028
1029 static int net_usershare_list(struct net_context *c, int argc,
1030                               const char **argv)
1031 {
1032         fstring wcard;
1033         bool only_ours = true;
1034         int ret = -1;
1035         struct us_priv_info pi;
1036         TALLOC_CTX *ctx;
1037
1038         fstrcpy(wcard, "*");
1039
1040         if (c->display_usage)
1041                 return net_usershare_list_usage(c, argc, argv);
1042
1043         if (c->opt_long_list_entries) {
1044                 only_ours = false;
1045         }
1046
1047         switch (argc) {
1048                 case 0:
1049                         break;
1050                 case 1:
1051                         fstrcpy(wcard, argv[0]);
1052                         break;
1053                 default:
1054                         return net_usershare_list_usage(c, argc, argv);
1055         }
1056
1057         if (!strlower_m(wcard)) {
1058                 return -1;
1059         }
1060
1061         ctx = talloc_init("share_list");
1062         ret = get_share_list(ctx, wcard, only_ours);
1063         if (ret) {
1064                 return ret;
1065         }
1066
1067         pi.ctx = ctx;
1068         pi.op = US_LIST_OP;
1069         pi.c = c;
1070
1071         ret = process_share_list(info_fn, &pi);
1072         talloc_destroy(ctx);
1073         return ret;
1074 }
1075
1076 /***************************************************************************
1077  Entry-point for all the USERSHARE functions.
1078 ***************************************************************************/
1079
1080 int net_usershare(struct net_context *c, int argc, const char **argv)
1081 {
1082         const struct loadparm_substitution *lp_sub =
1083                 loadparm_s3_global_substitution();
1084         DIR *dp;
1085
1086         struct functable func[] = {
1087                 {
1088                         "add",
1089                         net_usershare_add,
1090                         NET_TRANSPORT_LOCAL,
1091                         N_("Add/modify user defined share"),
1092                         N_("net usershare add\n"
1093                            "    Add/modify user defined share")
1094                 },
1095                 {
1096                         "delete",
1097                         net_usershare_delete,
1098                         NET_TRANSPORT_LOCAL,
1099                         N_("Delete user defined share"),
1100                         N_("net usershare delete\n"
1101                            "    Delete user defined share")
1102                 },
1103                 {
1104                         "info",
1105                         net_usershare_info,
1106                         NET_TRANSPORT_LOCAL,
1107                         N_("Display information about a user defined share"),
1108                         N_("net usershare info\n"
1109                            "    Display information about a user defined share")
1110                 },
1111                 {
1112                         "list",
1113                         net_usershare_list,
1114                         NET_TRANSPORT_LOCAL,
1115                         N_("List user defined shares"),
1116                         N_("net usershare list\n"
1117                            "    List user defined shares")
1118                 },
1119                 {NULL, NULL, 0, NULL, NULL}
1120         };
1121
1122         if (lp_usershare_max_shares() == 0) {
1123                 d_fprintf(stderr,
1124                           _("net usershare: usershares are currently "
1125                             "disabled\n"));
1126                 return -1;
1127         }
1128
1129         dp = opendir(lp_usershare_path(talloc_tos(), lp_sub));
1130         if (!dp) {
1131                 int err = errno;
1132                 d_fprintf(stderr,
1133                         _("net usershare: cannot open usershare directory %s. "
1134                           "Error %s\n"),
1135                         lp_usershare_path(talloc_tos(), lp_sub), strerror(err) );
1136                 if (err == EACCES) {
1137                         d_fprintf(stderr,
1138                                 _("You do not have permission to create a "
1139                                 "usershare. Ask your administrator to grant "
1140                                 "you permissions to create a share.\n"));
1141                 } else if (err == ENOENT) {
1142                         d_fprintf(stderr,
1143                                 _("Please ask your system administrator to "
1144                                   "enable user sharing.\n"));
1145                 }
1146                 return -1;
1147         }
1148         closedir(dp);
1149
1150         return net_run_function(c, argc, argv, "net usershare", func);
1151 }