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 #include "lib/util/string_wrappers.h"
  27 #include "lib/util/util_file.h"
  28
  29 struct {
  30         const char *us_errstr;
  31         enum usershare_err us_err;
  32 } us_errs [] = {
  33         {"",USERSHARE_OK},
  34         {N_("Malformed usershare file"), USERSHARE_MALFORMED_FILE},
  35         {N_("Bad version number"), USERSHARE_BAD_VERSION},
  36         {N_("Malformed path entry"), USERSHARE_MALFORMED_PATH},
  37         {N_("Malformed comment entryfile"), USERSHARE_MALFORMED_COMMENT_DEF},
  38         {N_("Malformed acl definition"), USERSHARE_MALFORMED_ACL_DEF},
  39         {N_("Acl parse error"), USERSHARE_ACL_ERR},
  40         {N_("Path not absolute"), USERSHARE_PATH_NOT_ABSOLUTE},
  41         {N_("Path is denied"), USERSHARE_PATH_IS_DENIED},
  42         {N_("Path not allowed"), USERSHARE_PATH_NOT_ALLOWED},
  43         {N_("Path is not a directory"), USERSHARE_PATH_NOT_DIRECTORY},
  44         {N_("System error"), USERSHARE_POSIX_ERR},
  45         {N_("Malformed sharename definition"), USERSHARE_MALFORMED_SHARENAME_DEF},
  46         {N_("Bad sharename (doesn't match filename)"), USERSHARE_BAD_SHARENAME},
  47         {NULL,(enum usershare_err)-1}
  48 };
  49
  50 static const char *get_us_error_code(enum usershare_err us_err)
  51 {
  52         char *result;
  53         int idx = 0;
  54
  55         while (us_errs[idx].us_errstr != NULL) {
  56                 if (us_errs[idx].us_err == us_err) {
  57                         return us_errs[idx].us_errstr;
  58                 }
  59                 idx++;
  60         }
  61
  62         result = talloc_asprintf(talloc_tos(), _("Usershare error code (0x%x)"),
  63                                  (unsigned int)us_err);
  64         SMB_ASSERT(result != NULL);
  65         return result;
  66 }
  67
  68 /* The help subsystem for the USERSHARE subcommand */
  69
  70 static int net_usershare_add_usage(struct net_context *c, int argc, const char **argv)
  71 {
  72         char chr = *lp_winbind_separator();
  73         d_printf(_(
  74                 "net usershare add [--long] <sharename> <path> [<comment>] [<acl>] [<guest_ok=[y|n]>]\n"
  75                 "\tAdds the specified share name for this user.\n"
  76                 "\t<sharename> is the new share name.\n"
  77                 "\t<path> is the path on the filesystem to export.\n"
  78                 "\t<comment> is the optional comment for the new share.\n"
  79                 "\t<acl> is an optional share acl in the format \"DOMAIN%cname:X,DOMAIN%cname:X,....\"\n"
  80                 "\t<guest_ok=y> if present sets \"guest ok = yes\" on this usershare.\n"
  81                 "\t\t\"X\" represents a permission and can be any one of the characters f, r or d\n"
  82                 "\t\twhere \"f\" means full control, \"r\" means read-only, \"d\" means deny access.\n"
  83                 "\t\tname may be a domain user or group. For local users use the local server name "
  84                 "instead of \"DOMAIN\"\n"
  85                 "\t\tThe default acl is \"Everyone:r\" which allows everyone read-only access.\n"
  86                 "\tAdd --long to print the info on the newly added share.\n"),
  87                 chr, chr );
  88         return -1;
  89 }
  90
  91 static int net_usershare_delete_usage(struct net_context *c, int argc, const char **argv)
  92 {
  93         d_printf(_(
  94                 "net usershare delete <sharename>\n"
  95                 "\tdeletes the specified share name for this user.\n"));
  96         return -1;
  97 }
  98
  99 static int net_usershare_info_usage(struct net_context *c, int argc, const char **argv)
 100 {
 101         d_printf(_(
 102                 "net usershare info [--long] [wildcard sharename]\n"
 103                 "\tPrints out the path, comment and acl elements of shares that match the wildcard.\n"
 104                 "\tBy default only gives info on shares owned by the current user\n"
 105                 "\tAdd --long to apply this to all shares\n"
 106                 "\tOmit the sharename or use a wildcard of '*' to see all shares\n"));
 107         return -1;
 108 }
 109
 110 static int net_usershare_list_usage(struct net_context *c, int argc, const char **argv)
 111 {
 112         d_printf(_(
 113                 "net usershare list [--long] [wildcard sharename]\n"
 114                 "\tLists the names of all shares that match the wildcard.\n"
 115                 "\tBy default only lists shares owned by the current user\n"
 116                 "\tAdd --long to apply this to all shares\n"
 117                 "\tOmit the sharename or use a wildcard of '*' to see all shares\n"));
 118         return -1;
 119 }
 120
 121 int net_usershare_usage(struct net_context *c, int argc, const char **argv)
 122 {
 123         d_printf(_("net usershare add <sharename> <path> [<comment>] [<acl>] [<guest_ok=[y|n]>] to "
 124                                 "add or change a user defined share.\n"
 125                 "net usershare delete <sharename> to delete a user defined share.\n"
 126                 "net usershare info [--long] [wildcard sharename] to print info about a user defined share.\n"
 127                 "net usershare list [--long] [wildcard sharename] to list user defined shares.\n"
 128                 "net usershare help\n"
 129                 "\nType \"net usershare help <option>\" to get more information on that option\n\n"));
 130
 131         net_common_flags_usage(c, argc, argv);
 132         return -1;
 133 }
 134
 135 /***************************************************************************
 136 ***************************************************************************/
 137
 138 static char *get_basepath(TALLOC_CTX *ctx)
 139 {
 140         const struct loadparm_substitution *lp_sub =
 141                 loadparm_s3_global_substitution();
 142         char *basepath = lp_usershare_path(ctx, lp_sub);
 143
 144         if (!basepath) {
 145                 return NULL;
 146         }
 147         if ((basepath[0] != '\0') && (basepath[strlen(basepath)-1] == '/')) {
 148                 basepath[strlen(basepath)-1] = '\0';
 149         }
 150         return basepath;
 151 }
 152
 153 /***************************************************************************
 154  Delete a single userlevel share.
 155 ***************************************************************************/
 156
 157 static int net_usershare_delete(struct net_context *c, int argc, const char **argv)
 158 {
 159         const struct loadparm_substitution *lp_sub =
 160                 loadparm_s3_global_substitution();
 161         char *us_path;
 162         char *sharename;
 163
 164         if (argc != 1 || c->display_usage) {
 165                 return net_usershare_delete_usage(c, argc, argv);
 166         }
 167
 168         if ((sharename = strlower_talloc(talloc_tos(), argv[0])) == NULL) {
 169                 d_fprintf(stderr, _("strlower_talloc failed\n"));
 170                 return -1;
 171         }
 172
 173         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 174                 d_fprintf(stderr, _("net usershare delete: share name %s contains "
 175                         "invalid characters (any of %s)\n"),
 176                         sharename, INVALID_SHARENAME_CHARS);
 177                 TALLOC_FREE(sharename);
 178                 return -1;
 179         }
 180
 181         us_path = talloc_asprintf(talloc_tos(),
 182                                 "%s/%s",
 183                                 lp_usershare_path(talloc_tos(), lp_sub),
 184                                 sharename);
 185         if (!us_path) {
 186                 TALLOC_FREE(sharename);
 187                 return -1;
 188         }
 189
 190         if (unlink(us_path) != 0) {
 191                 d_fprintf(stderr, _("net usershare delete: unable to remove usershare %s. "
 192                         "Error was %s\n"),
 193                         us_path, strerror(errno));
 194                 TALLOC_FREE(sharename);
 195                 return -1;
 196         }
 197         TALLOC_FREE(sharename);
 198         return 0;
 199 }
 200
 201 /***************************************************************************
 202  Data structures to handle a list of usershare files.
 203 ***************************************************************************/
 204
 205 struct file_list {
 206         struct file_list *next, *prev;
 207         const char *pathname;
 208 };
 209
 210 static struct file_list *flist;
 211
 212 /***************************************************************************
 213 ***************************************************************************/
 214
 215 static int get_share_list(TALLOC_CTX *ctx, const char *wcard, bool only_ours)
 216 {
 217         DIR *dp;
 218         struct dirent *de;
 219         uid_t myuid = geteuid();
 220         struct file_list *fl = NULL;
 221         char *basepath = get_basepath(ctx);
 222
 223         if (!basepath) {
 224                 return -1;
 225         }
 226         dp = opendir(basepath);
 227         if (!dp) {
 228                 d_fprintf(stderr,
 229                         _("get_share_list: cannot open usershare directory %s. "
 230                           "Error %s\n"),
 231                         basepath, strerror(errno) );
 232                 return -1;
 233         }
 234
 235         while((de = readdir(dp)) != 0) {
 236                 SMB_STRUCT_STAT sbuf;
 237                 char *path;
 238                 const char *n = de->d_name;
 239
 240                 /* Ignore . and .. */
 241                 if (*n == '.') {
 242                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 243                                 continue;
 244                         }
 245                 }
 246
 247                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 248                         d_fprintf(stderr,
 249                                   _("get_share_list: ignoring bad share "
 250                                     "name %s\n"), n);
 251                         continue;
 252                 }
 253                 path = talloc_asprintf(ctx,
 254                                         "%s/%s",
 255                                         basepath,
 256                                         n);
 257                 if (!path) {
 258                         closedir(dp);
 259                         return -1;
 260                 }
 261
 262                 if (sys_lstat(path, &sbuf, false) != 0) {
 263                         d_fprintf(stderr,
 264                                 _("get_share_list: can't lstat file %s. Error "
 265                                   "was %s\n"),
 266                                 path, strerror(errno) );
 267                         continue;
 268                 }
 269
 270                 if (!S_ISREG(sbuf.st_ex_mode)) {
 271                         d_fprintf(stderr,
 272                                   _("get_share_list: file %s is not a regular "
 273                                     "file. Ignoring.\n"),
 274                                 path );
 275                         continue;
 276                 }
 277
 278                 if (only_ours && sbuf.st_ex_uid != myuid) {
 279                         continue;
 280                 }
 281
 282                 if (!unix_wild_match(wcard, n)) {
 283                         continue;
 284                 }
 285
 286                 /* (Finally) - add to list. */
 287                 fl = talloc(ctx, struct file_list);
 288                 if (!fl) {
 289                         closedir(dp);
 290                         return -1;
 291                 }
 292                 fl->pathname = talloc_strdup(ctx, n);
 293                 if (!fl->pathname) {
 294                         closedir(dp);
 295                         return -1;
 296                 }
 297
 298                 DLIST_ADD(flist, fl);
 299         }
 300
 301         closedir(dp);
 302         return 0;
 303 }
 304
 305 enum us_priv_op { US_LIST_OP, US_INFO_OP};
 306
 307 struct us_priv_info {
 308         TALLOC_CTX *ctx;
 309         enum us_priv_op op;
 310         struct net_context *c;
 311 };
 312
 313 /***************************************************************************
 314  Call a function for every share on the list.
 315 ***************************************************************************/
 316
 317 static int process_share_list(int (*fn)(struct file_list *, void *), void *priv)
 318 {
 319         struct file_list *fl;
 320         int ret = 0;
 321
 322         for (fl = flist; fl; fl = fl->next) {
 323                 ret = (*fn)(fl, priv);
 324         }
 325
 326         return ret;
 327 }
 328
 329 /***************************************************************************
 330  Info function.
 331 ***************************************************************************/
 332
 333 static int info_fn(struct file_list *fl, void *priv)
 334 {
 335         SMB_STRUCT_STAT sbuf;
 336         char **lines = NULL;
 337         struct us_priv_info *pi = (struct us_priv_info *)priv;
 338         TALLOC_CTX *ctx = pi->ctx;
 339         struct net_context *c = pi->c;
 340         int fd = -1;
 341         int numlines = 0;
 342         struct security_descriptor *psd = NULL;
 343         char *basepath;
 344         char *sharepath = NULL;
 345         char *comment = NULL;
 346         char *cp_sharename = NULL;
 347         char *acl_str;
 348         int num_aces;
 349         char sep_str[2];
 350         enum usershare_err us_err;
 351         bool guest_ok = false;
 352
 353         sep_str[0] = *lp_winbind_separator();
 354         sep_str[1] = '\0';
 355
 356         basepath = get_basepath(ctx);
 357         if (!basepath) {
 358                 return -1;
 359         }
 360         basepath = talloc_asprintf_append(basepath,
 361                         "/%s",
 362                         fl->pathname);
 363         if (!basepath) {
 364                 return -1;
 365         }
 366
 367 #ifdef O_NOFOLLOW
 368         fd = open(basepath, O_RDONLY|O_NOFOLLOW, 0);
 369 #else
 370         fd = open(basepath, O_RDONLY, 0);
 371 #endif
 372
 373         if (fd == -1) {
 374                 d_fprintf(stderr, _("info_fn: unable to open %s. %s\n"),
 375                         basepath, strerror(errno) );
 376                 return -1;
 377         }
 378
 379         /* Paranoia... */
 380         if (sys_fstat(fd, &sbuf, false) != 0) {
 381                 d_fprintf(stderr,
 382                         _("info_fn: can't fstat file %s. Error was %s\n"),
 383                         basepath, strerror(errno) );
 384                 close(fd);
 385                 return -1;
 386         }
 387
 388         if (!S_ISREG(sbuf.st_ex_mode)) {
 389                 d_fprintf(stderr,
 390                         _("info_fn: file %s is not a regular file. Ignoring.\n"),
 391                         basepath );
 392                 close(fd);
 393                 return -1;
 394         }
 395
 396         lines = fd_lines_load(fd, &numlines, 10240, NULL);
 397         close(fd);
 398
 399         if (lines == NULL) {
 400                 return -1;
 401         }
 402
 403         /* Ensure it's well formed. */
 404         us_err = parse_usershare_file(ctx, &sbuf, fl->pathname, -1, lines, numlines,
 405                                 &sharepath,
 406                                 &comment,
 407                                 &cp_sharename,
 408                                 &psd,
 409                                 &guest_ok);
 410
 411         TALLOC_FREE(lines);
 412
 413         if (us_err != USERSHARE_OK) {
 414                 d_fprintf(stderr,
 415                         _("info_fn: file %s is not a well formed usershare "
 416                           "file.\n"),
 417                         basepath );
 418                 d_fprintf(stderr, _("info_fn: Error was %s.\n"),
 419                         get_us_error_code(us_err) );
 420                 return -1;
 421         }
 422
 423         acl_str = talloc_strdup(ctx, "usershare_acl=");
 424         if (!acl_str) {
 425                 return -1;
 426         }
 427
 428         for (num_aces = 0; num_aces < psd->dacl->num_aces; num_aces++) {
 429                 const char *domain;
 430                 const char *name;
 431                 NTSTATUS ntstatus;
 432
 433                 ntstatus = net_lookup_name_from_sid(c, ctx,
 434                                                     &psd->dacl->aces[num_aces].trustee,
 435                                                     &domain, &name);
 436
 437                 if (NT_STATUS_IS_OK(ntstatus)) {
 438                         if (domain && *domain) {
 439                                 acl_str = talloc_asprintf_append(acl_str,
 440                                                 "%s%s",
 441                                                 domain,
 442                                                 sep_str);
 443                                 if (!acl_str) {
 444                                         return -1;
 445                                 }
 446                         }
 447                         acl_str = talloc_asprintf_append(acl_str,
 448                                                 "%s",
 449                                                 name);
 450                         if (!acl_str) {
 451                                 return -1;
 452                         }
 453
 454                 } else {
 455                         struct dom_sid_buf sidstr;
 456
 457                         acl_str = talloc_asprintf_append(
 458                                 acl_str,
 459                                 "%s",
 460                                 dom_sid_str_buf(
 461                                         &psd->dacl->aces[num_aces].trustee,
 462                                         &sidstr));
 463                         if (!acl_str) {
 464                                 return -1;
 465                         }
 466                 }
 467                 acl_str = talloc_asprintf_append(acl_str, ":");
 468                 if (!acl_str) {
 469                         return -1;
 470                 }
 471
 472                 if (psd->dacl->aces[num_aces].type == SEC_ACE_TYPE_ACCESS_DENIED) {
 473                         acl_str = talloc_asprintf_append(acl_str, "D,");
 474                         if (!acl_str) {
 475                                 return -1;
 476                         }
 477                 } else {
 478                         if (psd->dacl->aces[num_aces].access_mask & GENERIC_ALL_ACCESS) {
 479                                 acl_str = talloc_asprintf_append(acl_str, "F,");
 480                         } else {
 481                                 acl_str = talloc_asprintf_append(acl_str, "R,");
 482                         }
 483                         if (!acl_str) {
 484                                 return -1;
 485                         }
 486                 }
 487         }
 488
 489         /* NOTE: This is smb.conf-like output. Do not translate. */
 490         if (pi->op == US_INFO_OP) {
 491                 d_printf("[%s]\n", cp_sharename );
 492                 d_printf("path=%s\n", sharepath );
 493                 d_printf("comment=%s\n", comment);
 494                 d_printf("%s\n", acl_str);
 495                 d_printf("guest_ok=%c\n\n", guest_ok ? 'y' : 'n');
 496         } else if (pi->op == US_LIST_OP) {
 497                 d_printf("%s\n", cp_sharename);
 498         }
 499
 500         return 0;
 501 }
 502
 503 /***************************************************************************
 504  Print out info (internal detail) on userlevel shares.
 505 ***************************************************************************/
 506
 507 static int net_usershare_info(struct net_context *c, int argc, const char **argv)
 508 {
 509         fstring wcard;
 510         bool only_ours = true;
 511         int ret = -1;
 512         struct us_priv_info pi;
 513         TALLOC_CTX *ctx;
 514
 515         fstrcpy(wcard, "*");
 516
 517         if (c->display_usage)
 518                 return net_usershare_info_usage(c, argc, argv);
 519
 520         if (c->opt_long_list_entries) {
 521                 only_ours = false;
 522         }
 523
 524         switch (argc) {
 525                 case 0:
 526                         break;
 527                 case 1:
 528                         fstrcpy(wcard, argv[0]);
 529                         break;
 530                 default:
 531                         return net_usershare_info_usage(c, argc, argv);
 532         }
 533
 534         if (!strlower_m(wcard)) {
 535                 return -1;
 536         }
 537
 538         ctx = talloc_init("share_info");
 539         ret = get_share_list(ctx, wcard, only_ours);
 540         if (ret) {
 541                 return ret;
 542         }
 543
 544         pi.ctx = ctx;
 545         pi.op = US_INFO_OP;
 546         pi.c = c;
 547
 548         ret = process_share_list(info_fn, &pi);
 549         talloc_destroy(ctx);
 550         return ret;
 551 }
 552
 553 /***************************************************************************
 554  Count the current total number of usershares.
 555 ***************************************************************************/
 556
 557 static int count_num_usershares(void)
 558 {
 559         DIR *dp;
 560         struct dirent *de;
 561         int num_usershares = 0;
 562         TALLOC_CTX *ctx = talloc_tos();
 563         char *basepath = get_basepath(ctx);
 564
 565         if (!basepath) {
 566                 return -1;
 567         }
 568
 569         dp = opendir(basepath);
 570         if (!dp) {
 571                 d_fprintf(stderr,
 572                         _("count_num_usershares: cannot open usershare "
 573                           "directory %s. Error %s\n"),
 574                         basepath, strerror(errno) );
 575                 return -1;
 576         }
 577
 578         while((de = readdir(dp)) != 0) {
 579                 SMB_STRUCT_STAT sbuf;
 580                 char *path;
 581                 const char *n = de->d_name;
 582
 583                 /* Ignore . and .. */
 584                 if (*n == '.') {
 585                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 586                                 continue;
 587                         }
 588                 }
 589
 590                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 591                         d_fprintf(stderr,
 592                                   _("count_num_usershares: ignoring bad share "
 593                                     "name %s\n"), n);
 594                         continue;
 595                 }
 596                 path = talloc_asprintf(ctx,
 597                                 "%s/%s",
 598                                 basepath,
 599                                 n);
 600                 if (!path) {
 601                         closedir(dp);
 602                         return -1;
 603                 }
 604
 605                 if (sys_lstat(path, &sbuf, false) != 0) {
 606                         d_fprintf(stderr,
 607                                 _("count_num_usershares: can't lstat file %s. "
 608                                   "Error was %s\n"),
 609                                 path, strerror(errno) );
 610                         continue;
 611                 }
 612
 613                 if (!S_ISREG(sbuf.st_ex_mode)) {
 614                         d_fprintf(stderr,
 615                                 _("count_num_usershares: file %s is not a "
 616                                   "regular file. Ignoring.\n"),
 617                                 path );
 618                         continue;
 619                 }
 620                 num_usershares++;
 621         }
 622
 623         closedir(dp);
 624         return num_usershares;
 625 }
 626
 627 /***************************************************************************
 628  Add a single userlevel share.
 629 ***************************************************************************/
 630
 631 static int net_usershare_add(struct net_context *c, int argc, const char **argv)
 632 {
 633         TALLOC_CTX *ctx = talloc_stackframe();
 634         SMB_STRUCT_STAT sbuf;
 635         SMB_STRUCT_STAT lsbuf;
 636         char *sharename;
 637         const char *cp_sharename;
 638         char *full_path;
 639         char *full_path_tmp;
 640         const char *us_path;
 641         const char *us_comment;
 642         const char *arg_acl;
 643         char *us_acl;
 644         char *file_img;
 645         int num_aces = 0;
 646         int i;
 647         int tmpfd;
 648         const char *pacl;
 649         size_t to_write;
 650         uid_t myeuid = geteuid();
 651         bool guest_ok = false;
 652         int num_usershares;
 653         mode_t mask;
 654
 655         us_comment = "";
 656         arg_acl = "S-1-1-0:R";
 657
 658         if (c->display_usage) {
 659                 TALLOC_FREE(ctx);
 660                 return net_usershare_add_usage(c, argc, argv);
 661         }
 662
 663         switch (argc) {
 664                 case 0:
 665                 case 1:
 666                 default:
 667                         TALLOC_FREE(ctx);
 668                         return net_usershare_add_usage(c, argc, argv);
 669                 case 2:
 670                         cp_sharename = argv[0];
 671                         sharename = strlower_talloc(ctx, argv[0]);
 672                         us_path = argv[1];
 673                         break;
 674                 case 3:
 675                         cp_sharename = argv[0];
 676                         sharename = strlower_talloc(ctx, argv[0]);
 677                         us_path = argv[1];
 678                         us_comment = argv[2];
 679                         break;
 680                 case 4:
 681                         cp_sharename = argv[0];
 682                         sharename = strlower_talloc(ctx, argv[0]);
 683                         us_path = argv[1];
 684                         us_comment = argv[2];
 685                         arg_acl = argv[3];
 686                         break;
 687                 case 5:
 688                         cp_sharename = argv[0];
 689                         sharename = strlower_talloc(ctx, argv[0]);
 690                         us_path = argv[1];
 691                         us_comment = argv[2];
 692                         arg_acl = argv[3];
 693                         if (strlen(arg_acl) == 0) {
 694                                 arg_acl = "S-1-1-0:R";
 695                         }
 696                         if (!strnequal(argv[4], "guest_ok=", 9)) {
 697                                 TALLOC_FREE(ctx);
 698                                 return net_usershare_add_usage(c, argc, argv);
 699                         }
 700                         switch (argv[4][9]) {
 701                                 case 'y':
 702                                 case 'Y':
 703                                         guest_ok = true;
 704                                         break;
 705                                 case 'n':
 706                                 case 'N':
 707                                         guest_ok = false;
 708                                         break;
 709                                 default:
 710                                         TALLOC_FREE(ctx);
 711                                         return net_usershare_add_usage(c, argc, argv);
 712                         }
 713                         break;
 714         }
 715
 716         /* Ensure we're under the "usershare max shares" number. Advisory only. */
 717         num_usershares = count_num_usershares();
 718         if (num_usershares >= lp_usershare_max_shares()) {
 719                 d_fprintf(stderr,
 720                         _("net usershare add: maximum number of allowed "
 721                           "usershares (%d) reached\n"),
 722                         lp_usershare_max_shares() );
 723                 TALLOC_FREE(ctx);
 724                 return -1;
 725         }
 726
 727         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 728                 d_fprintf(stderr, _("net usershare add: share name %s contains "
 729                         "invalid characters (any of %s)\n"),
 730                         sharename, INVALID_SHARENAME_CHARS);
 731                 TALLOC_FREE(ctx);
 732                 return -1;
 733         }
 734
 735         /* Disallow shares the same as users. */
 736         if (getpwnam(sharename)) {
 737                 d_fprintf(stderr,
 738                         _("net usershare add: share name %s is already a valid "
 739                           "system user name\n"),
 740                         sharename );
 741                 TALLOC_FREE(ctx);
 742                 return -1;
 743         }
 744
 745         /* Construct the full path for the usershare file. */
 746         full_path = get_basepath(ctx);
 747         if (!full_path) {
 748                 TALLOC_FREE(ctx);
 749                 return -1;
 750         }
 751         full_path_tmp = talloc_asprintf(ctx,
 752                         "%s/:tmpXXXXXX",
 753                         full_path);
 754         if (!full_path_tmp) {
 755                 TALLOC_FREE(ctx);
 756                 return -1;
 757         }
 758
 759         full_path = talloc_asprintf_append(full_path,
 760                                         "/%s",
 761                                         sharename);
 762         if (!full_path) {
 763                 TALLOC_FREE(ctx);
 764                 return -1;
 765         }
 766
 767         /* The path *must* be absolute. */
 768         if (us_path[0] != '/') {
 769                 d_fprintf(stderr,
 770                         _("net usershare add: path %s is not an absolute "
 771                           "path.\n"),
 772                         us_path);
 773                 TALLOC_FREE(ctx);
 774                 return -1;
 775         }
 776
 777         /* Check the directory to be shared exists. */
 778         if (sys_stat(us_path, &sbuf, false) != 0) {
 779                 d_fprintf(stderr,
 780                         _("net usershare add: cannot stat path %s to ensure "
 781                           "this is a directory. Error was %s\n"),
 782                         us_path, strerror(errno) );
 783                 TALLOC_FREE(ctx);
 784                 return -1;
 785         }
 786
 787         if (!S_ISDIR(sbuf.st_ex_mode)) {
 788                 d_fprintf(stderr,
 789                         _("net usershare add: path %s is not a directory.\n"),
 790                         us_path );
 791                 TALLOC_FREE(ctx);
 792                 return -1;
 793         }
 794
 795         /* If we're not root, check if we're restricted to sharing out directories
 796            that we own only. */
 797
 798         if ((myeuid != 0) && lp_usershare_owner_only() && (myeuid != sbuf.st_ex_uid)) {
 799                 d_fprintf(stderr, _("net usershare add: cannot share path %s as "
 800                         "we are restricted to only sharing directories we own.\n"
 801                         "\tAsk the administrator to add the line \"usershare owner only = false\" \n"
 802                         "\tto the [global] section of the smb.conf to allow this.\n"),
 803                         us_path );
 804                 TALLOC_FREE(ctx);
 805                 return -1;
 806         }
 807
 808         /* No validation needed on comment. Now go through and validate the
 809            acl string. Convert names to SID's as needed. Then run it through
 810            parse_usershare_acl to ensure it's valid. */
 811
 812         /* Start off the string we'll append to. */
 813         us_acl = talloc_strdup(ctx, "");
 814         if (!us_acl) {
 815                 TALLOC_FREE(ctx);
 816                 return -1;
 817         }
 818
 819         pacl = arg_acl;
 820         num_aces = 1;
 821
 822         /* Add the number of ',' characters to get the number of aces. */
 823         num_aces += count_chars(pacl,',');
 824
 825         for (i = 0; i < num_aces; i++) {
 826                 struct dom_sid sid;
 827                 struct dom_sid_buf buf;
 828                 const char *pcolon = strchr_m(pacl, ':');
 829                 const char *name;
 830
 831                 if (pcolon == NULL) {
 832                         d_fprintf(stderr,
 833                                 _("net usershare add: malformed acl %s "
 834                                   "(missing ':').\n"),
 835                                 pacl );
 836                         TALLOC_FREE(ctx);
 837                         return -1;
 838                 }
 839
 840                 switch(pcolon[1]) {
 841                         case 'f':
 842                         case 'F':
 843                         case 'd':
 844                         case 'r':
 845                         case 'R':
 846                                 break;
 847                         default:
 848                                 d_fprintf(stderr,
 849                                         _("net usershare add: malformed acl %s "
 850                                           "(access control must be 'r', 'f', "
 851                                           "or 'd')\n"),
 852                                         pacl );
 853                                 TALLOC_FREE(ctx);
 854                                 return -1;
 855                 }
 856
 857                 if (pcolon[2] != ',' && pcolon[2] != '\0') {
 858                         d_fprintf(stderr,
 859                                 _("net usershare add: malformed terminating "
 860                                   "character for acl %s\n"),
 861                                 pacl );
 862                         TALLOC_FREE(ctx);
 863                         return -1;
 864                 }
 865
 866                 /* Get the name */
 867                 if ((name = talloc_strndup(ctx, pacl, pcolon - pacl)) == NULL) {
 868                         d_fprintf(stderr, _("talloc_strndup failed\n"));
 869                         TALLOC_FREE(ctx);
 870                         return -1;
 871                 }
 872                 if (!string_to_sid(&sid, name)) {
 873                         /* Convert to a SID */
 874                         NTSTATUS ntstatus = net_lookup_sid_from_name(c, ctx, name, &sid);
 875                         if (!NT_STATUS_IS_OK(ntstatus)) {
 876                                 d_fprintf(stderr,
 877                                         _("net usershare add: cannot convert "
 878                                           "name \"%s\" to a SID. %s."),
 879                                         name, get_friendly_nt_error_msg(ntstatus) );
 880                                 if (NT_STATUS_EQUAL(ntstatus, NT_STATUS_CONNECTION_REFUSED)) {
 881                                         d_fprintf(stderr,
 882                                             _(" Maybe smbd is not running.\n"));
 883                                 } else {
 884                                         d_fprintf(stderr, "\n");
 885                                 }
 886                                 TALLOC_FREE(ctx);
 887                                 return -1;
 888                         }
 889                 }
 890                 us_acl = talloc_asprintf_append(
 891                         us_acl,
 892                         "%s:%c,",
 893                         dom_sid_str_buf(&sid, &buf),
 894                         pcolon[1]);
 895                 if (us_acl == NULL) {
 896                         d_fprintf(stderr,
 897                                   _("net usershare add: talloc_asprintf_append() failed\n"));
 898                         TALLOC_FREE(ctx);
 899                         return -1;
 900                 }
 901
 902                 /* Move to the next ACL entry. */
 903                 if (pcolon[2] == ',') {
 904                         pacl = &pcolon[3];
 905                 }
 906         }
 907
 908         /* Remove the last ',' */
 909         us_acl[strlen(us_acl)-1] = '\0';
 910
 911         if (guest_ok && !lp_usershare_allow_guests()) {
 912                 d_fprintf(stderr, _("net usershare add: guest_ok=y requested "
 913                         "but the \"usershare allow guests\" parameter is not "
 914                         "enabled by this server.\n"));
 915                 TALLOC_FREE(ctx);
 916                 return -1;
 917         }
 918
 919         /* Create a temporary filename for this share. */
 920         mask = umask(S_IRWXO | S_IRWXG);
 921         tmpfd = mkstemp(full_path_tmp);
 922         umask(mask);
 923
 924         if (tmpfd == -1) {
 925                 d_fprintf(stderr,
 926                           _("net usershare add: cannot create tmp file %s\n"),
 927                           full_path_tmp );
 928                 TALLOC_FREE(ctx);
 929                 return -1;
 930         }
 931
 932         /* Ensure we opened the file we thought we did. */
 933         if (sys_lstat(full_path_tmp, &lsbuf, false) != 0) {
 934                 d_fprintf(stderr,
 935                           _("net usershare add: cannot lstat tmp file %s\n"),
 936                           full_path_tmp );
 937                 TALLOC_FREE(ctx);
 938                 close(tmpfd);
 939                 return -1;
 940         }
 941
 942         /* Check this is the same as the file we opened. */
 943         if (sys_fstat(tmpfd, &sbuf, false) != 0) {
 944                 d_fprintf(stderr,
 945                           _("net usershare add: cannot fstat tmp file %s\n"),
 946                           full_path_tmp );
 947                 TALLOC_FREE(ctx);
 948                 close(tmpfd);
 949                 return -1;
 950         }
 951
 952         if (!S_ISREG(sbuf.st_ex_mode) || sbuf.st_ex_dev != lsbuf.st_ex_dev || sbuf.st_ex_ino != lsbuf.st_ex_ino) {
 953                 d_fprintf(stderr,
 954                           _("net usershare add: tmp file %s is not a regular "
 955                             "file ?\n"),
 956                           full_path_tmp );
 957                 TALLOC_FREE(ctx);
 958                 close(tmpfd);
 959                 return -1;
 960         }
 961
 962         if (fchmod(tmpfd, 0644) == -1) {
 963                 d_fprintf(stderr,
 964                           _("net usershare add: failed to fchmod tmp file %s "
 965                             "to 0644\n"),
 966                           full_path_tmp );
 967                 TALLOC_FREE(ctx);
 968                 close(tmpfd);
 969                 return -1;
 970         }
 971
 972         /* Create the in-memory image of the file. */
 973         file_img = talloc_strdup(ctx, "#VERSION 2\npath=");
 974         if (file_img == NULL) {
 975                 d_fprintf(stderr,
 976                           _("net usershare add: talloc_strdup() failed\n"));
 977                 TALLOC_FREE(ctx);
 978                 close(tmpfd);
 979                 return -1;
 980         }
 981         file_img = talloc_asprintf_append(file_img,
 982                         "%s\ncomment=%s\nusershare_acl=%s\n"
 983                         "guest_ok=%c\nsharename=%s\n",
 984                         us_path,
 985                         us_comment,
 986                         us_acl,
 987                         guest_ok ? 'y' : 'n',
 988                         cp_sharename);
 989         if (file_img == NULL) {
 990                 d_fprintf(stderr,
 991                           _("net usershare add: talloc_asprintf_append() failed\n"));
 992                 TALLOC_FREE(ctx);
 993                 close(tmpfd);
 994                 return -1;
 995         }
 996
 997         to_write = strlen(file_img);
 998
 999         if (write(tmpfd, file_img, to_write) != to_write) {
1000                 d_fprintf(stderr,
1001                         _("net usershare add: failed to write %u bytes to "
1002                           "file %s. Error was %s\n"),
1003                         (unsigned int)to_write, full_path_tmp, strerror(errno));
1004                 unlink(full_path_tmp);
1005                 TALLOC_FREE(ctx);
1006                 close(tmpfd);
1007                 return -1;
1008         }
1009
1010         /* Attempt to replace any existing share by this name. */
1011         if (rename(full_path_tmp, full_path) != 0) {
1012                 unlink(full_path_tmp);
1013                 d_fprintf(stderr,
1014                         _("net usershare add: failed to add share %s. Error "
1015                           "was %s\n"),
1016                         sharename, strerror(errno));
1017                 TALLOC_FREE(ctx);
1018                 close(tmpfd);
1019                 return -1;
1020         }
1021
1022         close(tmpfd);
1023
1024         if (c->opt_long_list_entries) {
1025                 const char *my_argv[2];
1026                 my_argv[0] = sharename;
1027                 my_argv[1] = NULL;
1028                 net_usershare_info(c, 1, my_argv);
1029         }
1030
1031         TALLOC_FREE(ctx);
1032         return 0;
1033 }
1034
1035 #if 0
1036 /***************************************************************************
1037  List function.
1038 ***************************************************************************/
1039
1040 static int list_fn(struct file_list *fl, void *priv)
1041 {
1042         d_printf("%s\n", fl->pathname);
1043         return 0;
1044 }
1045 #endif
1046
1047 /***************************************************************************
1048  List userlevel shares.
1049 ***************************************************************************/
1050
1051 static int net_usershare_list(struct net_context *c, int argc,
1052                               const char **argv)
1053 {
1054         fstring wcard;
1055         bool only_ours = true;
1056         int ret = -1;
1057         struct us_priv_info pi;
1058         TALLOC_CTX *ctx;
1059
1060         fstrcpy(wcard, "*");
1061
1062         if (c->display_usage)
1063                 return net_usershare_list_usage(c, argc, argv);
1064
1065         if (c->opt_long_list_entries) {
1066                 only_ours = false;
1067         }
1068
1069         switch (argc) {
1070                 case 0:
1071                         break;
1072                 case 1:
1073                         fstrcpy(wcard, argv[0]);
1074                         break;
1075                 default:
1076                         return net_usershare_list_usage(c, argc, argv);
1077         }
1078
1079         if (!strlower_m(wcard)) {
1080                 return -1;
1081         }
1082
1083         ctx = talloc_init("share_list");
1084         ret = get_share_list(ctx, wcard, only_ours);
1085         if (ret) {
1086                 return ret;
1087         }
1088
1089         pi.ctx = ctx;
1090         pi.op = US_LIST_OP;
1091         pi.c = c;
1092
1093         ret = process_share_list(info_fn, &pi);
1094         talloc_destroy(ctx);
1095         return ret;
1096 }
1097
1098 /***************************************************************************
1099  Entry-point for all the USERSHARE functions.
1100 ***************************************************************************/
1101
1102 int net_usershare(struct net_context *c, int argc, const char **argv)
1103 {
1104         const struct loadparm_substitution *lp_sub =
1105                 loadparm_s3_global_substitution();
1106         DIR *dp;
1107
1108         struct functable func[] = {
1109                 {
1110                         "add",
1111                         net_usershare_add,
1112                         NET_TRANSPORT_LOCAL,
1113                         N_("Add/modify user defined share"),
1114                         N_("net usershare add\n"
1115                            "    Add/modify user defined share")
1116                 },
1117                 {
1118                         "delete",
1119                         net_usershare_delete,
1120                         NET_TRANSPORT_LOCAL,
1121                         N_("Delete user defined share"),
1122                         N_("net usershare delete\n"
1123                            "    Delete user defined share")
1124                 },
1125                 {
1126                         "info",
1127                         net_usershare_info,
1128                         NET_TRANSPORT_LOCAL,
1129                         N_("Display information about a user defined share"),
1130                         N_("net usershare info\n"
1131                            "    Display information about a user defined share")
1132                 },
1133                 {
1134                         "list",
1135                         net_usershare_list,
1136                         NET_TRANSPORT_LOCAL,
1137                         N_("List user defined shares"),
1138                         N_("net usershare list\n"
1139                            "    List user defined shares")
1140                 },
1141                 {NULL, NULL, 0, NULL, NULL}
1142         };
1143
1144         if (lp_usershare_max_shares() == 0) {
1145                 d_fprintf(stderr,
1146                           _("net usershare: usershares are currently "
1147                             "disabled\n"));
1148                 return -1;
1149         }
1150
1151         dp = opendir(lp_usershare_path(talloc_tos(), lp_sub));
1152         if (!dp) {
1153                 int err = errno;
1154                 d_fprintf(stderr,
1155                         _("net usershare: cannot open usershare directory %s. "
1156                           "Error %s\n"),
1157                         lp_usershare_path(talloc_tos(), lp_sub), strerror(err) );
1158                 if (err == EACCES) {
1159                         d_fprintf(stderr,
1160                                 _("You do not have permission to create a "
1161                                 "usershare. Ask your administrator to grant "
1162                                 "you permissions to create a share.\n"));
1163                 } else if (err == ENOENT) {
1164                         d_fprintf(stderr,
1165                                 _("Please ask your system administrator to "
1166                                   "enable user sharing.\n"));
1167                 }
1168                 return -1;
1169         }
1170         closedir(dp);
1171
1172         return net_run_function(c, argc, argv, "net usershare", func);
1173 }