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 2 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, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 #include "includes.h"
  22 #include "utils/net.h"
  23
  24 struct {
  25         const char *us_errstr;
  26         enum usershare_err us_err;
  27 } us_errs [] = {
  28         {"",USERSHARE_OK},
  29         {"Malformed usershare file", USERSHARE_MALFORMED_FILE},
  30         {"Bad version number", USERSHARE_BAD_VERSION},
  31         {"Malformed path entry", USERSHARE_MALFORMED_PATH},
  32         {"Malformed comment entryfile", USERSHARE_MALFORMED_COMMENT_DEF},
  33         {"Malformed acl definition", USERSHARE_MALFORMED_ACL_DEF},
  34         {"Acl parse error", USERSHARE_ACL_ERR},
  35         {"Path not absolute", USERSHARE_PATH_NOT_ABSOLUTE},
  36         {"Path is denied", USERSHARE_PATH_IS_DENIED},
  37         {"Path not allowed", USERSHARE_PATH_NOT_ALLOWED},
  38         {"Path is not a directory", USERSHARE_PATH_NOT_DIRECTORY},
  39         {"System error", USERSHARE_POSIX_ERR},
  40         {NULL,(enum usershare_err)-1}
  41 };
  42
  43 static const char *get_us_error_code(enum usershare_err us_err)
  44 {
  45         static pstring out;
  46         int idx = 0;
  47
  48         while (us_errs[idx].us_errstr != NULL) {
  49                 if (us_errs[idx].us_err == us_err) {
  50                         return us_errs[idx].us_errstr;
  51                 }
  52                 idx++;
  53         }
  54
  55         slprintf(out, sizeof(out), "Usershare error code (0x%x)", (unsigned int)us_err);
  56         return out;
  57 }
  58
  59 /* The help subsystem for the USERSHARE subcommand */
  60
  61 static int net_usershare_add_usage(int argc, const char **argv)
  62 {
  63         char c = *lp_winbind_separator();
  64         d_printf(
  65                 "net usershare add [-l|--long] <sharename> <path> [<comment>] [<acl>] [<guest_ok=[y|n]>]\n"
  66                 "\tAdds the specified share name for this user.\n"
  67                 "\t<sharename> is the new share name.\n"
  68                 "\t<path> is the path on the filesystem to export.\n"
  69                 "\t<comment> is the optional comment for the new share.\n"
  70                 "\t<acl> is an optional share acl in the format \"DOMAIN%cname:X,DOMAIN%cname:X,....\"\n"
  71                 "\t<guest_ok=y> if present sets \"guest ok = yes\" on this usershare.\n"
  72                 "\t\t\"X\" represents a permission and can be any one of the characters f, r or d\n"
  73                 "\t\twhere \"f\" means full control, \"r\" means read-only, \"d\" means deny access.\n"
  74                 "\t\tname may be a domain user or group. For local users use the local server name "
  75                 "instead of \"DOMAIN\"\n"
  76                 "\t\tThe default acl is \"Everyone:r\" which allows everyone read-only access.\n"
  77                 "\tAdd -l or --long to print the info on the newly added share.\n",
  78                 c, c );
  79         return -1;
  80 }
  81
  82 static int net_usershare_delete_usage(int argc, const char **argv)
  83 {
  84         d_printf(
  85                 "net usershare delete <sharename>\n"\
  86                 "\tdeletes the specified share name for this user.\n");
  87         return -1;
  88 }
  89
  90 static int net_usershare_info_usage(int argc, const char **argv)
  91 {
  92         d_printf(
  93                 "net usershare info [-l|--long] [wildcard sharename]\n"\
  94                 "\tPrints out the path, comment and acl elements of shares that match the wildcard.\n"
  95                 "\tBy default only gives info on shares owned by the current user\n"
  96                 "\tAdd -l or --long to apply this to all shares\n"
  97                 "\tOmit the sharename or use a wildcard of '*' to see all shares\n");
  98         return -1;
  99 }
 100
 101 static int net_usershare_list_usage(int argc, const char **argv)
 102 {
 103         d_printf(
 104                 "net usershare list [-l|--long] [wildcard sharename]\n"\
 105                 "\tLists the names of all shares that match the wildcard.\n"
 106                 "\tBy default only lists shares owned by the current user\n"
 107                 "\tAdd -l or --long to apply this to all shares\n"
 108                 "\tOmit the sharename or use a wildcard of '*' to see all shares\n");
 109         return -1;
 110 }
 111
 112 int net_usershare_usage(int argc, const char **argv)
 113 {
 114         d_printf("net usershare add <sharename> <path> [<comment>] [<acl>] [<guest_ok=[y|n]>] to "
 115                                 "add or change a user defined share.\n"
 116                 "net usershare delete <sharename> to delete a user defined share.\n"
 117                 "net usershare info [-l|--long] [wildcard sharename] to print info about a user defined share.\n"
 118                 "net usershare list [-l|--long] [wildcard sharename] to list user defined shares.\n"
 119                 "net usershare help\n"\
 120                 "\nType \"net usershare help <option>\" to get more information on that option\n\n");
 121
 122         net_common_flags_usage(argc, argv);
 123         return -1;
 124 }
 125
 126 /***************************************************************************
 127 ***************************************************************************/
 128
 129 static void get_basepath(pstring basepath)
 130 {
 131         pstrcpy(basepath, lp_usershare_path());
 132         if ((basepath[0] != '\0') && (basepath[strlen(basepath)-1] == '/')) {
 133                 basepath[strlen(basepath)-1] = '\0';
 134         }
 135 }
 136
 137 /***************************************************************************
 138  Delete a single userlevel share.
 139 ***************************************************************************/
 140
 141 static int net_usershare_delete(int argc, const char **argv)
 142 {
 143         pstring us_path;
 144         char *sharename;
 145
 146         if (argc != 1) {
 147                 return net_usershare_delete_usage(argc, argv);
 148         }
 149
 150         if ((sharename = strdup_lower(argv[0])) == NULL) {
 151                 d_fprintf(stderr, "strdup failed\n");
 152                 return -1;
 153         }
 154
 155         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 156                 d_fprintf(stderr, "net usershare delete: share name %s contains "
 157                         "invalid characters (any of %s)\n",
 158                         sharename, INVALID_SHARENAME_CHARS);
 159                 SAFE_FREE(sharename);
 160                 return -1;
 161         }
 162
 163         pstrcpy(us_path, lp_usershare_path());
 164         pstrcat(us_path, "/");
 165         pstrcat(us_path, sharename);
 166
 167         if (unlink(us_path) != 0) {
 168                 d_fprintf(stderr, "net usershare delete: unable to remove usershare %s. "
 169                         "Error was %s\n",
 170                         us_path, strerror(errno));
 171                 SAFE_FREE(sharename);
 172                 return -1;
 173         }
 174         SAFE_FREE(sharename);
 175         return 0;
 176 }
 177
 178 /***************************************************************************
 179  Data structures to handle a list of usershare files.
 180 ***************************************************************************/
 181
 182 struct file_list {
 183         struct file_list *next, *prev;
 184         const char *pathname;
 185 };
 186
 187 static struct file_list *flist;
 188
 189 /***************************************************************************
 190 ***************************************************************************/
 191
 192 static int get_share_list(TALLOC_CTX *ctx, const char *wcard, BOOL only_ours)
 193 {
 194         SMB_STRUCT_DIR *dp;
 195         SMB_STRUCT_DIRENT *de;
 196         uid_t myuid = geteuid();
 197         struct file_list *fl = NULL;
 198         pstring basepath;
 199
 200         get_basepath(basepath);
 201         dp = sys_opendir(basepath);
 202         if (!dp) {
 203                 d_fprintf(stderr, "get_share_list: cannot open usershare directory %s. Error %s\n",
 204                         basepath, strerror(errno) );
 205                 return -1;
 206         }
 207
 208         while((de = sys_readdir(dp)) != 0) {
 209                 SMB_STRUCT_STAT sbuf;
 210                 pstring path;
 211                 const char *n = de->d_name;
 212
 213                 /* Ignore . and .. */
 214                 if (*n == '.') {
 215                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 216                                 continue;
 217                         }
 218                 }
 219
 220                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 221                         d_fprintf(stderr, "get_share_list: ignoring bad share name %s\n",n);
 222                         continue;
 223                 }
 224                 pstrcpy(path, basepath);
 225                 pstrcat(path, "/");
 226                 pstrcat(path, n);
 227
 228                 if (sys_lstat(path, &sbuf) != 0) {
 229                         d_fprintf(stderr, "get_share_list: can't lstat file %s. Error was %s\n",
 230                                 path, strerror(errno) );
 231                         continue;
 232                 }
 233
 234                 if (!S_ISREG(sbuf.st_mode)) {
 235                         d_fprintf(stderr, "get_share_list: file %s is not a regular file. Ignoring.\n",
 236                                 path );
 237                         continue;
 238                 }
 239
 240                 if (only_ours && sbuf.st_uid != myuid) {
 241                         continue;
 242                 }
 243
 244                 if (!unix_wild_match(wcard, n)) {
 245                         continue;
 246                 }
 247
 248                 /* (Finally) - add to list. */
 249                 fl = TALLOC_P(ctx, struct file_list);
 250                 if (!fl) {
 251                         return -1;
 252                 }
 253                 fl->pathname = talloc_strdup(ctx, n);
 254                 if (!fl->pathname) {
 255                         return -1;
 256                 }
 257
 258                 DLIST_ADD(flist, fl);
 259         }
 260
 261         sys_closedir(dp);
 262         return 0;
 263 }
 264
 265 enum us_priv_op { US_LIST_OP, US_INFO_OP};
 266
 267 struct us_priv_info {
 268         TALLOC_CTX *ctx;
 269         enum us_priv_op op;
 270 };
 271
 272 /***************************************************************************
 273  Call a function for every share on the list.
 274 ***************************************************************************/
 275
 276 static int process_share_list(int (*fn)(struct file_list *, void *), void *priv)
 277 {
 278         struct file_list *fl;
 279         int ret = 0;
 280
 281         for (fl = flist; fl; fl = fl->next) {
 282                 ret = (*fn)(fl, priv);
 283         }
 284
 285         return ret;
 286 }
 287
 288 /***************************************************************************
 289  Info function.
 290 ***************************************************************************/
 291
 292 static int info_fn(struct file_list *fl, void *priv)
 293 {
 294         SMB_STRUCT_STAT sbuf;
 295         char **lines = NULL;
 296         struct us_priv_info *pi = (struct us_priv_info *)priv;
 297         TALLOC_CTX *ctx = pi->ctx;
 298         int fd = -1;
 299         int numlines = 0;
 300         SEC_DESC *psd = NULL;
 301         pstring basepath;
 302         pstring sharepath;
 303         pstring comment;
 304         pstring acl_str;
 305         int num_aces;
 306         char sep_str[2];
 307         enum usershare_err us_err;
 308         BOOL guest_ok = False;
 309
 310         sep_str[0] = *lp_winbind_separator();
 311         sep_str[1] = '\0';
 312
 313         get_basepath(basepath);
 314         pstrcat(basepath, "/");
 315         pstrcat(basepath, fl->pathname);
 316
 317 #ifdef O_NOFOLLOW
 318         fd = sys_open(basepath, O_RDONLY|O_NOFOLLOW, 0);
 319 #else
 320         fd = sys_open(basepath, O_RDONLY, 0);
 321 #endif
 322
 323         if (fd == -1) {
 324                 d_fprintf(stderr, "info_fn: unable to open %s. %s\n",
 325                         basepath, strerror(errno) );
 326                 return -1;
 327         }
 328
 329         /* Paranoia... */
 330         if (sys_fstat(fd, &sbuf) != 0) {
 331                 d_fprintf(stderr, "info_fn: can't fstat file %s. Error was %s\n",
 332                         basepath, strerror(errno) );
 333                 close(fd);
 334                 return -1;
 335         }
 336
 337         if (!S_ISREG(sbuf.st_mode)) {
 338                 d_fprintf(stderr, "info_fn: file %s is not a regular file. Ignoring.\n",
 339                         basepath );
 340                 close(fd);
 341                 return -1;
 342         }
 343
 344         lines = fd_lines_load(fd, &numlines, 10240);
 345         close(fd);
 346
 347         if (lines == NULL) {
 348                 return -1;
 349         }
 350
 351         /* Ensure it's well formed. */
 352         us_err = parse_usershare_file(ctx, &sbuf, fl->pathname, -1, lines, numlines,
 353                                 sharepath,
 354                                 comment,
 355                                 &psd,
 356                                 &guest_ok);
 357
 358         file_lines_free(lines);
 359
 360         if (us_err != USERSHARE_OK) {
 361                 d_fprintf(stderr, "info_fn: file %s is not a well formed usershare file.\n",
 362                         basepath );
 363                 d_fprintf(stderr, "info_fn: Error was %s.\n",
 364                         get_us_error_code(us_err) );
 365                 return -1;
 366         }
 367
 368         pstrcpy(acl_str, "usershare_acl=");
 369
 370         for (num_aces = 0; num_aces < psd->dacl->num_aces; num_aces++) {
 371                 const char *domain;
 372                 const char *name;
 373                 NTSTATUS ntstatus;
 374
 375                 ntstatus = net_lookup_name_from_sid(ctx, &psd->dacl->ace[num_aces].trustee, &domain, &name);
 376
 377                 if (NT_STATUS_IS_OK(ntstatus)) {
 378                         if (domain && *domain) {
 379                                 pstrcat(acl_str, domain);
 380                                 pstrcat(acl_str, sep_str);
 381                         }
 382                         pstrcat(acl_str,name);
 383                 } else {
 384                         fstring sidstr;
 385                         sid_to_string(sidstr, &psd->dacl->ace[num_aces].trustee);
 386                         pstrcat(acl_str,sidstr);
 387                 }
 388                 pstrcat(acl_str, ":");
 389
 390                 if (psd->dacl->ace[num_aces].type == SEC_ACE_TYPE_ACCESS_DENIED) {
 391                         pstrcat(acl_str, "D,");
 392                 } else {
 393                         if (psd->dacl->ace[num_aces].info.mask & GENERIC_ALL_ACCESS) {
 394                                 pstrcat(acl_str, "F,");
 395                         } else {
 396                                 pstrcat(acl_str, "R,");
 397                         }
 398                 }
 399         }
 400
 401         acl_str[strlen(acl_str)-1] = '\0';
 402
 403         if (pi->op == US_INFO_OP) {
 404                 d_printf("[%s]\n", fl->pathname );
 405                 d_printf("path=%s\n", sharepath );
 406                 d_printf("comment=%s\n", comment);
 407                 d_printf("%s\n", acl_str);
 408                 d_printf("guest_ok=%c\n\n", guest_ok ? 'y' : 'n');
 409         } else if (pi->op == US_LIST_OP) {
 410                 d_printf("%s\n", fl->pathname);
 411         }
 412
 413         return 0;
 414 }
 415
 416 /***************************************************************************
 417  Print out info (internal detail) on userlevel shares.
 418 ***************************************************************************/
 419
 420 static int net_usershare_info(int argc, const char **argv)
 421 {
 422         fstring wcard;
 423         BOOL only_ours = True;
 424         int ret = -1;
 425         struct us_priv_info pi;
 426         TALLOC_CTX *ctx;
 427
 428         fstrcpy(wcard, "*");
 429
 430         if (opt_long_list_entries) {
 431                 only_ours = False;
 432         }
 433
 434         switch (argc) {
 435                 case 0:
 436                         break;
 437                 case 1:
 438                         fstrcpy(wcard, argv[0]);
 439                         break;
 440                 default:
 441                         return net_usershare_info_usage(argc, argv);
 442         }
 443
 444         strlower_m(wcard);
 445
 446         ctx = talloc_init("share_info");
 447         ret = get_share_list(ctx, wcard, only_ours);
 448         if (ret) {
 449                 return ret;
 450         }
 451
 452         pi.ctx = ctx;
 453         pi.op = US_INFO_OP;
 454
 455         ret = process_share_list(info_fn, &pi);
 456         talloc_destroy(ctx);
 457         return ret;
 458 }
 459
 460 /***************************************************************************
 461  Count the current total number of usershares.
 462 ***************************************************************************/
 463
 464 static int count_num_usershares(void)
 465 {
 466         SMB_STRUCT_DIR *dp;
 467         SMB_STRUCT_DIRENT *de;
 468         pstring basepath;
 469         int num_usershares = 0;
 470
 471         get_basepath(basepath);
 472         dp = sys_opendir(basepath);
 473         if (!dp) {
 474                 d_fprintf(stderr, "count_num_usershares: cannot open usershare directory %s. Error %s\n",
 475                         basepath, strerror(errno) );
 476                 return -1;
 477         }
 478
 479         while((de = sys_readdir(dp)) != 0) {
 480                 SMB_STRUCT_STAT sbuf;
 481                 pstring path;
 482                 const char *n = de->d_name;
 483
 484                 /* Ignore . and .. */
 485                 if (*n == '.') {
 486                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 487                                 continue;
 488                         }
 489                 }
 490
 491                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 492                         d_fprintf(stderr, "count_num_usershares: ignoring bad share name %s\n",n);
 493                         continue;
 494                 }
 495                 pstrcpy(path, basepath);
 496                 pstrcat(path, "/");
 497                 pstrcat(path, n);
 498
 499                 if (sys_lstat(path, &sbuf) != 0) {
 500                         d_fprintf(stderr, "count_num_usershares: can't lstat file %s. Error was %s\n",
 501                                 path, strerror(errno) );
 502                         continue;
 503                 }
 504
 505                 if (!S_ISREG(sbuf.st_mode)) {
 506                         d_fprintf(stderr, "count_num_usershares: file %s is not a regular file. Ignoring.\n",
 507                                 path );
 508                         continue;
 509                 }
 510                 num_usershares++;
 511         }
 512
 513         sys_closedir(dp);
 514         return num_usershares;
 515 }
 516
 517 /***************************************************************************
 518  Add a single userlevel share.
 519 ***************************************************************************/
 520
 521 static int net_usershare_add(int argc, const char **argv)
 522 {
 523         TALLOC_CTX *ctx = NULL;
 524         SMB_STRUCT_STAT sbuf;
 525         SMB_STRUCT_STAT lsbuf;
 526         char *sharename;
 527         pstring full_path;
 528         pstring full_path_tmp;
 529         const char *us_path;
 530         const char *us_comment;
 531         const char *arg_acl;
 532         char *us_acl;
 533         char *file_img;
 534         int num_aces = 0;
 535         int i;
 536         int tmpfd;
 537         const char *pacl;
 538         size_t to_write;
 539         uid_t myeuid = geteuid();
 540         BOOL guest_ok = False;
 541         int num_usershares;
 542
 543         us_comment = "";
 544         arg_acl = "S-1-1-0:R";
 545
 546         switch (argc) {
 547                 case 0:
 548                 case 1:
 549                 default:
 550                         return net_usershare_add_usage(argc, argv);
 551                 case 2:
 552                         sharename = strdup_lower(argv[0]);
 553                         us_path = argv[1];
 554                         break;
 555                 case 3:
 556                         sharename = strdup_lower(argv[0]);
 557                         us_path = argv[1];
 558                         us_comment = argv[2];
 559                         break;
 560                 case 4:
 561                         sharename = strdup_lower(argv[0]);
 562                         us_path = argv[1];
 563                         us_comment = argv[2];
 564                         arg_acl = argv[3];
 565                         break;
 566                 case 5:
 567                         sharename = strdup_lower(argv[0]);
 568                         us_path = argv[1];
 569                         us_comment = argv[2];
 570                         arg_acl = argv[3];
 571                         if (!strnequal(argv[4], "guest_ok=", 9)) {
 572                                 return net_usershare_add_usage(argc, argv);
 573                         }
 574                         switch (argv[4][9]) {
 575                                 case 'y':
 576                                 case 'Y':
 577                                         guest_ok = True;
 578                                         break;
 579                                 case 'n':
 580                                 case 'N':
 581                                         guest_ok = False;
 582                                         break;
 583                                 default:
 584                                         return net_usershare_add_usage(argc, argv);
 585                         }
 586                         break;
 587         }
 588
 589         /* Ensure we're under the "usershare max shares" number. Advisory only. */
 590         num_usershares = count_num_usershares();
 591         if (num_usershares > lp_usershare_max_shares()) {
 592                 d_fprintf(stderr, "net usershare add: too many usershares already defined (%d), "
 593                         "maximum number allowed is %d.\n",
 594                         num_usershares, lp_usershare_max_shares() );
 595                 SAFE_FREE(sharename);
 596                 return -1;
 597         }
 598
 599         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 600                 d_fprintf(stderr, "net usershare add: share name %s contains "
 601                         "invalid characters (any of %s)\n",
 602                         sharename, INVALID_SHARENAME_CHARS);
 603                 SAFE_FREE(sharename);
 604                 return -1;
 605         }
 606
 607         /* Disallow shares the same as users. */
 608         if (getpwnam(sharename)) {
 609                 d_fprintf(stderr, "net usershare add: share name %s is already a valid system user name\n",
 610                         sharename );
 611                 SAFE_FREE(sharename);
 612                 return -1;
 613         }
 614
 615         /* Construct the full path for the usershare file. */
 616         get_basepath(full_path);
 617         pstrcat(full_path, "/");
 618         pstrcpy(full_path_tmp, full_path);
 619         pstrcat(full_path, sharename);
 620         pstrcat(full_path_tmp, ":tmpXXXXXX");
 621
 622         /* The path *must* be absolute. */
 623         if (us_path[0] != '/') {
 624                 d_fprintf(stderr,"net usershare add: path %s is not an absolute path.\n",
 625                         us_path);
 626                 SAFE_FREE(sharename);
 627                 return -1;
 628         }
 629
 630         /* Check the directory to be shared exists. */
 631         if (sys_stat(us_path, &sbuf) != 0) {
 632                 d_fprintf(stderr, "net usershare add: cannot stat path %s to ensure "
 633                         "this is a directory. Error was %s\n",
 634                         us_path, strerror(errno) );
 635                 SAFE_FREE(sharename);
 636                 return -1;
 637         }
 638
 639         if (!S_ISDIR(sbuf.st_mode)) {
 640                 d_fprintf(stderr, "net usershare add: path %s is not a directory.\n",
 641                         us_path );
 642                 SAFE_FREE(sharename);
 643                 return -1;
 644         }
 645
 646         /* If we're not root, check if we're restricted to sharing out directories
 647            that we own only. */
 648
 649         if ((myeuid != 0) && lp_usershare_owner_only() && (myeuid != sbuf.st_uid)) {
 650                 d_fprintf(stderr, "net usershare add: cannot share path %s as "
 651                         "we are restricted to only sharing directories we own.\n"
 652                         "\tAsk the administrator to add the line \"usershare owner only = False\" \n"
 653                         "\tto the [global] section of the smb.conf to allow this.\n",
 654                         us_path );
 655                 SAFE_FREE(sharename);
 656                 return -1;
 657         }
 658
 659         /* No validation needed on comment. Now go through and validate the
 660            acl string. Convert names to SID's as needed. Then run it through
 661            parse_usershare_acl to ensure it's valid. */
 662
 663         ctx = talloc_init("share_info");
 664
 665         /* Start off the string we'll append to. */
 666         us_acl = talloc_strdup(ctx, "");
 667
 668         pacl = arg_acl;
 669         num_aces = 1;
 670
 671         /* Add the number of ',' characters to get the number of aces. */
 672         num_aces += count_chars(pacl,',');
 673
 674         for (i = 0; i < num_aces; i++) {
 675                 DOM_SID sid;
 676                 const char *pcolon = strchr_m(pacl, ':');
 677                 const char *name;
 678
 679                 if (pcolon == NULL) {
 680                         d_fprintf(stderr, "net usershare add: malformed acl %s (missing ':').\n",
 681                                 pacl );
 682                         talloc_destroy(ctx);
 683                         SAFE_FREE(sharename);
 684                         return -1;
 685                 }
 686
 687                 switch(pcolon[1]) {
 688                         case 'f':
 689                         case 'F':
 690                         case 'd':
 691                         case 'r':
 692                         case 'R':
 693                                 break;
 694                         default:
 695                                 d_fprintf(stderr, "net usershare add: malformed acl %s "
 696                                         "(access control must be 'r', 'f', or 'd')\n",
 697                                         pacl );
 698                                 talloc_destroy(ctx);
 699                                 SAFE_FREE(sharename);
 700                                 return -1;
 701                 }
 702
 703                 if (pcolon[2] != ',' && pcolon[2] != '\0') {
 704                         d_fprintf(stderr, "net usershare add: malformed terminating character for acl %s\n",
 705                                 pacl );
 706                         talloc_destroy(ctx);
 707                         SAFE_FREE(sharename);
 708                         return -1;
 709                 }
 710
 711                 /* Get the name */
 712                 if ((name = talloc_strndup(ctx, pacl, pcolon - pacl)) == NULL) {
 713                         d_fprintf(stderr, "talloc_strndup failed\n");
 714                         talloc_destroy(ctx);
 715                         SAFE_FREE(sharename);
 716                         return -1;
 717                 }
 718                 if (!string_to_sid(&sid, name)) {
 719                         /* Convert to a SID */
 720                         NTSTATUS ntstatus = net_lookup_sid_from_name(ctx, name, &sid);
 721                         if (!NT_STATUS_IS_OK(ntstatus)) {
 722                                 d_fprintf(stderr, "net usershare add: cannot convert name \"%s\" to a SID. %s.",
 723                                         name, get_friendly_nt_error_msg(ntstatus) );
 724                                 if (NT_STATUS_EQUAL(ntstatus, NT_STATUS_CONNECTION_REFUSED)) {
 725                                         d_fprintf(stderr,  " Maybe smbd is not running.\n");
 726                                 } else {
 727                                         d_fprintf(stderr, "\n");
 728                                 }
 729                                 talloc_destroy(ctx);
 730                                 SAFE_FREE(sharename);
 731                                 return -1;
 732                         }
 733                 }
 734                 us_acl = talloc_asprintf_append(us_acl, "%s:%c,", sid_string_static(&sid), pcolon[1]);
 735
 736                 /* Move to the next ACL entry. */
 737                 if (pcolon[2] == ',') {
 738                         pacl = &pcolon[3];
 739                 }
 740         }
 741
 742         /* Remove the last ',' */
 743         us_acl[strlen(us_acl)-1] = '\0';
 744
 745         if (guest_ok && !lp_usershare_allow_guests()) {
 746                 d_fprintf(stderr, "net usershare add: guest_ok=y requested "
 747                         "but the \"usershare allow guests\" parameter is not enabled "
 748                         "by this server.\n");
 749                 talloc_destroy(ctx);
 750                 SAFE_FREE(sharename);
 751                 return -1;
 752         }
 753
 754         /* Create a temporary filename for this share. */
 755         tmpfd = smb_mkstemp(full_path_tmp);
 756
 757         if (tmpfd == -1) {
 758                 d_fprintf(stderr, "net usershare add: cannot create tmp file %s\n",
 759                                 full_path_tmp );
 760                 talloc_destroy(ctx);
 761                 SAFE_FREE(sharename);
 762                 return -1;
 763         }
 764
 765         /* Ensure we opened the file we thought we did. */
 766         if (sys_lstat(full_path_tmp, &lsbuf) != 0) {
 767                 d_fprintf(stderr, "net usershare add: cannot lstat tmp file %s\n",
 768                                 full_path_tmp );
 769                 talloc_destroy(ctx);
 770                 SAFE_FREE(sharename);
 771                 return -1;
 772         }
 773
 774         /* Check this is the same as the file we opened. */
 775         if (sys_fstat(tmpfd, &sbuf) != 0) {
 776                 d_fprintf(stderr, "net usershare add: cannot fstat tmp file %s\n",
 777                                 full_path_tmp );
 778                 talloc_destroy(ctx);
 779                 SAFE_FREE(sharename);
 780                 return -1;
 781         }
 782
 783         if (!S_ISREG(sbuf.st_mode) || sbuf.st_dev != lsbuf.st_dev || sbuf.st_ino != lsbuf.st_ino) {
 784                 d_fprintf(stderr, "net usershare add: tmp file %s is not a regular file ?\n",
 785                                 full_path_tmp );
 786                 talloc_destroy(ctx);
 787                 SAFE_FREE(sharename);
 788                 return -1;
 789         }
 790
 791         if (fchmod(tmpfd, 0644) == -1) {
 792                 d_fprintf(stderr, "net usershare add: failed to fchmod tmp file %s to 0644n",
 793                                 full_path_tmp );
 794                 talloc_destroy(ctx);
 795                 SAFE_FREE(sharename);
 796                 return -1;
 797         }
 798
 799         /* Create the in-memory image of the file. */
 800         file_img = talloc_strdup(ctx, "#VERSION 2\npath=");
 801         file_img = talloc_asprintf_append(file_img, "%s\ncomment=%s\nusershare_acl=%s\nguest_ok=%c\n",
 802                         us_path, us_comment, us_acl, guest_ok ? 'y' : 'n');
 803
 804         to_write = strlen(file_img);
 805
 806         if (write(tmpfd, file_img, to_write) != to_write) {
 807                 d_fprintf(stderr, "net usershare add: failed to write %u bytes to file %s. Error was %s\n",
 808                         (unsigned int)to_write, full_path_tmp, strerror(errno));
 809                 unlink(full_path_tmp);
 810                 talloc_destroy(ctx);
 811                 SAFE_FREE(sharename);
 812                 return -1;
 813         }
 814
 815         /* Attempt to replace any existing share by this name. */
 816         if (rename(full_path_tmp, full_path) != 0) {
 817                 unlink(full_path_tmp);
 818                 d_fprintf(stderr, "net usershare add: failed to add share %s. Error was %s\n",
 819                         sharename, strerror(errno));
 820                 talloc_destroy(ctx);
 821                 close(tmpfd);
 822                 SAFE_FREE(sharename);
 823                 return -1;
 824         }
 825
 826         close(tmpfd);
 827         talloc_destroy(ctx);
 828
 829         if (opt_long_list_entries) {
 830                 const char *my_argv[2];
 831                 my_argv[0] = sharename;
 832                 my_argv[1] = NULL;
 833                 net_usershare_info(1, my_argv);
 834         }
 835
 836         SAFE_FREE(sharename);
 837         return 0;
 838 }
 839
 840 #if 0
 841 /***************************************************************************
 842  List function.
 843 ***************************************************************************/
 844
 845 static int list_fn(struct file_list *fl, void *priv)
 846 {
 847         d_printf("%s\n", fl->pathname);
 848         return 0;
 849 }
 850 #endif
 851
 852 /***************************************************************************
 853  List userlevel shares.
 854 ***************************************************************************/
 855
 856 static int net_usershare_list(int argc, const char **argv)
 857 {
 858         fstring wcard;
 859         BOOL only_ours = True;
 860         int ret = -1;
 861         struct us_priv_info pi;
 862         TALLOC_CTX *ctx;
 863
 864         fstrcpy(wcard, "*");
 865
 866         if (opt_long_list_entries) {
 867                 only_ours = False;
 868         }
 869
 870         switch (argc) {
 871                 case 0:
 872                         break;
 873                 case 1:
 874                         fstrcpy(wcard, argv[0]);
 875                         break;
 876                 default:
 877                         return net_usershare_list_usage(argc, argv);
 878         }
 879
 880         strlower_m(wcard);
 881
 882         ctx = talloc_init("share_list");
 883         ret = get_share_list(ctx, wcard, only_ours);
 884         if (ret) {
 885                 return ret;
 886         }
 887
 888         pi.ctx = ctx;
 889         pi.op = US_LIST_OP;
 890
 891         ret = process_share_list(info_fn, &pi);
 892         talloc_destroy(ctx);
 893         return ret;
 894 }
 895
 896 /***************************************************************************
 897  Handle "net usershare help *" subcommands.
 898 ***************************************************************************/
 899
 900 int net_usershare_help(int argc, const char **argv)
 901 {
 902         struct functable func[] = {
 903                 {"ADD", net_usershare_add_usage},
 904                 {"DELETE", net_usershare_delete_usage},
 905                 {"INFO", net_usershare_info_usage},
 906                 {"LIST", net_usershare_list_usage},
 907                 {NULL, NULL}};
 908
 909         return net_run_function(argc, argv, func, net_usershare_usage);
 910 }
 911
 912 /***************************************************************************
 913  Entry-point for all the USERSHARE functions.
 914 ***************************************************************************/
 915
 916 int net_usershare(int argc, const char **argv)
 917 {
 918         SMB_STRUCT_DIR *dp;
 919
 920         struct functable func[] = {
 921                 {"ADD", net_usershare_add},
 922                 {"DELETE", net_usershare_delete},
 923                 {"INFO", net_usershare_info},
 924                 {"LIST", net_usershare_list},
 925                 {"HELP", net_usershare_help},
 926                 {NULL, NULL}
 927         };
 928
 929         if (lp_usershare_max_shares() == 0) {
 930                 d_fprintf(stderr, "net usershare: usershares are currently disabled\n");
 931                 return -1;
 932         }
 933
 934         dp = sys_opendir(lp_usershare_path());
 935         if (!dp) {
 936                 int err = errno;
 937                 d_fprintf(stderr, "net usershare: cannot open usershare directory %s. Error %s\n",
 938                         lp_usershare_path(), strerror(err) );
 939                 if (err == EACCES) {
 940                         d_fprintf(stderr, "You do not have permission to create a usershare. Ask your "
 941                                 "administrator to grant you permissions to create a share.\n");
 942                 } else if (err == ENOENT) {
 943                         d_fprintf(stderr, "Please ask your system administrator to "
 944                                 "enable user sharing.\n");
 945                 }
 946                 return -1;
 947         }
 948         sys_closedir(dp);
 949
 950         return net_run_function(argc, argv, func, net_usershare_usage);
 951 }