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 #include "includes.h"
  21 #include "utils/net.h"
  22
  23 struct {
  24         const char *us_errstr;
  25         enum usershare_err us_err;
  26 } us_errs [] = {
  27         {"",USERSHARE_OK},
  28         {"Malformed usershare file", USERSHARE_MALFORMED_FILE},
  29         {"Bad version number", USERSHARE_BAD_VERSION},
  30         {"Malformed path entry", USERSHARE_MALFORMED_PATH},
  31         {"Malformed comment entryfile", USERSHARE_MALFORMED_COMMENT_DEF},
  32         {"Malformed acl definition", USERSHARE_MALFORMED_ACL_DEF},
  33         {"Acl parse error", USERSHARE_ACL_ERR},
  34         {"Path not absolute", USERSHARE_PATH_NOT_ABSOLUTE},
  35         {"Path is denied", USERSHARE_PATH_IS_DENIED},
  36         {"Path not allowed", USERSHARE_PATH_NOT_ALLOWED},
  37         {"Path is not a directory", USERSHARE_PATH_NOT_DIRECTORY},
  38         {"System error", USERSHARE_POSIX_ERR},
  39         {NULL,(enum usershare_err)-1}
  40 };
  41
  42 static const char *get_us_error_code(enum usershare_err us_err)
  43 {
  44         static pstring out;
  45         int idx = 0;
  46
  47         while (us_errs[idx].us_errstr != NULL) {
  48                 if (us_errs[idx].us_err == us_err) {
  49                         return us_errs[idx].us_errstr;
  50                 }
  51                 idx++;
  52         }
  53
  54         slprintf(out, sizeof(out), "Usershare error code (0x%x)", (unsigned int)us_err);
  55         return out;
  56 }
  57
  58 /* The help subsystem for the USERSHARE subcommand */
  59
  60 static int net_usershare_add_usage(int argc, const char **argv)
  61 {
  62         char c = *lp_winbind_separator();
  63         d_printf(
  64                 "net usershare add [-l|--long] <sharename> <path> [<comment>] [<acl>] [<guest_ok=[y|n]>]\n"
  65                 "\tAdds the specified share name for this user.\n"
  66                 "\t<sharename> is the new share name.\n"
  67                 "\t<path> is the path on the filesystem to export.\n"
  68                 "\t<comment> is the optional comment for the new share.\n"
  69                 "\t<acl> is an optional share acl in the format \"DOMAIN%cname:X,DOMAIN%cname:X,....\"\n"
  70                 "\t<guest_ok=y> if present sets \"guest ok = yes\" on this usershare.\n"
  71                 "\t\t\"X\" represents a permission and can be any one of the characters f, r or d\n"
  72                 "\t\twhere \"f\" means full control, \"r\" means read-only, \"d\" means deny access.\n"
  73                 "\t\tname may be a domain user or group. For local users use the local server name "
  74                 "instead of \"DOMAIN\"\n"
  75                 "\t\tThe default acl is \"Everyone:r\" which allows everyone read-only access.\n"
  76                 "\tAdd -l or --long to print the info on the newly added share.\n",
  77                 c, c );
  78         return -1;
  79 }
  80
  81 static int net_usershare_delete_usage(int argc, const char **argv)
  82 {
  83         d_printf(
  84                 "net usershare delete <sharename>\n"\
  85                 "\tdeletes the specified share name for this user.\n");
  86         return -1;
  87 }
  88
  89 static int net_usershare_info_usage(int argc, const char **argv)
  90 {
  91         d_printf(
  92                 "net usershare info [-l|--long] [wildcard sharename]\n"\
  93                 "\tPrints out the path, comment and acl elements of shares that match the wildcard.\n"
  94                 "\tBy default only gives info on shares owned by the current user\n"
  95                 "\tAdd -l or --long to apply this to all shares\n"
  96                 "\tOmit the sharename or use a wildcard of '*' to see all shares\n");
  97         return -1;
  98 }
  99
 100 static int net_usershare_list_usage(int argc, const char **argv)
 101 {
 102         d_printf(
 103                 "net usershare list [-l|--long] [wildcard sharename]\n"\
 104                 "\tLists the names of all shares that match the wildcard.\n"
 105                 "\tBy default only lists shares owned by the current user\n"
 106                 "\tAdd -l or --long to apply this to all shares\n"
 107                 "\tOmit the sharename or use a wildcard of '*' to see all shares\n");
 108         return -1;
 109 }
 110
 111 int net_usershare_usage(int argc, const char **argv)
 112 {
 113         d_printf("net usershare add <sharename> <path> [<comment>] [<acl>] [<guest_ok=[y|n]>] to "
 114                                 "add or change a user defined share.\n"
 115                 "net usershare delete <sharename> to delete a user defined share.\n"
 116                 "net usershare info [-l|--long] [wildcard sharename] to print info about a user defined share.\n"
 117                 "net usershare list [-l|--long] [wildcard sharename] to list user defined shares.\n"
 118                 "net usershare help\n"\
 119                 "\nType \"net usershare help <option>\" to get more information on that option\n\n");
 120
 121         net_common_flags_usage(argc, argv);
 122         return -1;
 123 }
 124
 125 /***************************************************************************
 126 ***************************************************************************/
 127
 128 static void get_basepath(pstring basepath)
 129 {
 130         pstrcpy(basepath, lp_usershare_path());
 131         if ((basepath[0] != '\0') && (basepath[strlen(basepath)-1] == '/')) {
 132                 basepath[strlen(basepath)-1] = '\0';
 133         }
 134 }
 135
 136 /***************************************************************************
 137  Delete a single userlevel share.
 138 ***************************************************************************/
 139
 140 static int net_usershare_delete(int argc, const char **argv)
 141 {
 142         pstring us_path;
 143         char *sharename;
 144
 145         if (argc != 1) {
 146                 return net_usershare_delete_usage(argc, argv);
 147         }
 148
 149         if ((sharename = strdup_lower(argv[0])) == NULL) {
 150                 d_fprintf(stderr, "strdup failed\n");
 151                 return -1;
 152         }
 153
 154         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 155                 d_fprintf(stderr, "net usershare delete: share name %s contains "
 156                         "invalid characters (any of %s)\n",
 157                         sharename, INVALID_SHARENAME_CHARS);
 158                 SAFE_FREE(sharename);
 159                 return -1;
 160         }
 161
 162         pstrcpy(us_path, lp_usershare_path());
 163         pstrcat(us_path, "/");
 164         pstrcat(us_path, sharename);
 165
 166         if (unlink(us_path) != 0) {
 167                 d_fprintf(stderr, "net usershare delete: unable to remove usershare %s. "
 168                         "Error was %s\n",
 169                         us_path, strerror(errno));
 170                 SAFE_FREE(sharename);
 171                 return -1;
 172         }
 173         SAFE_FREE(sharename);
 174         return 0;
 175 }
 176
 177 /***************************************************************************
 178  Data structures to handle a list of usershare files.
 179 ***************************************************************************/
 180
 181 struct file_list {
 182         struct file_list *next, *prev;
 183         const char *pathname;
 184 };
 185
 186 static struct file_list *flist;
 187
 188 /***************************************************************************
 189 ***************************************************************************/
 190
 191 static int get_share_list(TALLOC_CTX *ctx, const char *wcard, bool only_ours)
 192 {
 193         SMB_STRUCT_DIR *dp;
 194         SMB_STRUCT_DIRENT *de;
 195         uid_t myuid = geteuid();
 196         struct file_list *fl = NULL;
 197         pstring basepath;
 198
 199         get_basepath(basepath);
 200         dp = sys_opendir(basepath);
 201         if (!dp) {
 202                 d_fprintf(stderr, "get_share_list: cannot open usershare directory %s. Error %s\n",
 203                         basepath, strerror(errno) );
 204                 return -1;
 205         }
 206
 207         while((de = sys_readdir(dp)) != 0) {
 208                 SMB_STRUCT_STAT sbuf;
 209                 pstring path;
 210                 const char *n = de->d_name;
 211
 212                 /* Ignore . and .. */
 213                 if (*n == '.') {
 214                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 215                                 continue;
 216                         }
 217                 }
 218
 219                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 220                         d_fprintf(stderr, "get_share_list: ignoring bad share name %s\n",n);
 221                         continue;
 222                 }
 223                 pstrcpy(path, basepath);
 224                 pstrcat(path, "/");
 225                 pstrcat(path, n);
 226
 227                 if (sys_lstat(path, &sbuf) != 0) {
 228                         d_fprintf(stderr, "get_share_list: can't lstat file %s. Error was %s\n",
 229                                 path, strerror(errno) );
 230                         continue;
 231                 }
 232
 233                 if (!S_ISREG(sbuf.st_mode)) {
 234                         d_fprintf(stderr, "get_share_list: file %s is not a regular file. Ignoring.\n",
 235                                 path );
 236                         continue;
 237                 }
 238
 239                 if (only_ours && sbuf.st_uid != myuid) {
 240                         continue;
 241                 }
 242
 243                 if (!unix_wild_match(wcard, n)) {
 244                         continue;
 245                 }
 246
 247                 /* (Finally) - add to list. */
 248                 fl = TALLOC_P(ctx, struct file_list);
 249                 if (!fl) {
 250                         return -1;
 251                 }
 252                 fl->pathname = talloc_strdup(ctx, n);
 253                 if (!fl->pathname) {
 254                         return -1;
 255                 }
 256
 257                 DLIST_ADD(flist, fl);
 258         }
 259
 260         sys_closedir(dp);
 261         return 0;
 262 }
 263
 264 enum us_priv_op { US_LIST_OP, US_INFO_OP};
 265
 266 struct us_priv_info {
 267         TALLOC_CTX *ctx;
 268         enum us_priv_op op;
 269 };
 270
 271 /***************************************************************************
 272  Call a function for every share on the list.
 273 ***************************************************************************/
 274
 275 static int process_share_list(int (*fn)(struct file_list *, void *), void *priv)
 276 {
 277         struct file_list *fl;
 278         int ret = 0;
 279
 280         for (fl = flist; fl; fl = fl->next) {
 281                 ret = (*fn)(fl, priv);
 282         }
 283
 284         return ret;
 285 }
 286
 287 /***************************************************************************
 288  Info function.
 289 ***************************************************************************/
 290
 291 static int info_fn(struct file_list *fl, void *priv)
 292 {
 293         SMB_STRUCT_STAT sbuf;
 294         char **lines = NULL;
 295         struct us_priv_info *pi = (struct us_priv_info *)priv;
 296         TALLOC_CTX *ctx = pi->ctx;
 297         int fd = -1;
 298         int numlines = 0;
 299         SEC_DESC *psd = NULL;
 300         pstring basepath;
 301         pstring sharepath;
 302         pstring comment;
 303         pstring acl_str;
 304         int num_aces;
 305         char sep_str[2];
 306         enum usershare_err us_err;
 307         bool guest_ok = False;
 308
 309         sep_str[0] = *lp_winbind_separator();
 310         sep_str[1] = '\0';
 311
 312         get_basepath(basepath);
 313         pstrcat(basepath, "/");
 314         pstrcat(basepath, fl->pathname);
 315
 316 #ifdef O_NOFOLLOW
 317         fd = sys_open(basepath, O_RDONLY|O_NOFOLLOW, 0);
 318 #else
 319         fd = sys_open(basepath, O_RDONLY, 0);
 320 #endif
 321
 322         if (fd == -1) {
 323                 d_fprintf(stderr, "info_fn: unable to open %s. %s\n",
 324                         basepath, strerror(errno) );
 325                 return -1;
 326         }
 327
 328         /* Paranoia... */
 329         if (sys_fstat(fd, &sbuf) != 0) {
 330                 d_fprintf(stderr, "info_fn: can't fstat file %s. Error was %s\n",
 331                         basepath, strerror(errno) );
 332                 close(fd);
 333                 return -1;
 334         }
 335
 336         if (!S_ISREG(sbuf.st_mode)) {
 337                 d_fprintf(stderr, "info_fn: file %s is not a regular file. Ignoring.\n",
 338                         basepath );
 339                 close(fd);
 340                 return -1;
 341         }
 342
 343         lines = fd_lines_load(fd, &numlines, 10240);
 344         close(fd);
 345
 346         if (lines == NULL) {
 347                 return -1;
 348         }
 349
 350         /* Ensure it's well formed. */
 351         us_err = parse_usershare_file(ctx, &sbuf, fl->pathname, -1, lines, numlines,
 352                                 sharepath,
 353                                 comment,
 354                                 &psd,
 355                                 &guest_ok);
 356
 357         file_lines_free(lines);
 358
 359         if (us_err != USERSHARE_OK) {
 360                 d_fprintf(stderr, "info_fn: file %s is not a well formed usershare file.\n",
 361                         basepath );
 362                 d_fprintf(stderr, "info_fn: Error was %s.\n",
 363                         get_us_error_code(us_err) );
 364                 return -1;
 365         }
 366
 367         pstrcpy(acl_str, "usershare_acl=");
 368
 369         for (num_aces = 0; num_aces < psd->dacl->num_aces; num_aces++) {
 370                 const char *domain;
 371                 const char *name;
 372                 NTSTATUS ntstatus;
 373
 374                 ntstatus = net_lookup_name_from_sid(ctx, &psd->dacl->aces[num_aces].trustee, &domain, &name);
 375
 376                 if (NT_STATUS_IS_OK(ntstatus)) {
 377                         if (domain && *domain) {
 378                                 pstrcat(acl_str, domain);
 379                                 pstrcat(acl_str, sep_str);
 380                         }
 381                         pstrcat(acl_str,name);
 382                 } else {
 383                         fstring sidstr;
 384                         sid_to_string(sidstr, &psd->dacl->aces[num_aces].trustee);
 385                         pstrcat(acl_str,sidstr);
 386                 }
 387                 pstrcat(acl_str, ":");
 388
 389                 if (psd->dacl->aces[num_aces].type == SEC_ACE_TYPE_ACCESS_DENIED) {
 390                         pstrcat(acl_str, "D,");
 391                 } else {
 392                         if (psd->dacl->aces[num_aces].access_mask & GENERIC_ALL_ACCESS) {
 393                                 pstrcat(acl_str, "F,");
 394                         } else {
 395                                 pstrcat(acl_str, "R,");
 396                         }
 397                 }
 398         }
 399
 400         acl_str[strlen(acl_str)-1] = '\0';
 401
 402         if (pi->op == US_INFO_OP) {
 403                 d_printf("[%s]\n", fl->pathname );
 404                 d_printf("path=%s\n", sharepath );
 405                 d_printf("comment=%s\n", comment);
 406                 d_printf("%s\n", acl_str);
 407                 d_printf("guest_ok=%c\n\n", guest_ok ? 'y' : 'n');
 408         } else if (pi->op == US_LIST_OP) {
 409                 d_printf("%s\n", fl->pathname);
 410         }
 411
 412         return 0;
 413 }
 414
 415 /***************************************************************************
 416  Print out info (internal detail) on userlevel shares.
 417 ***************************************************************************/
 418
 419 static int net_usershare_info(int argc, const char **argv)
 420 {
 421         fstring wcard;
 422         bool only_ours = True;
 423         int ret = -1;
 424         struct us_priv_info pi;
 425         TALLOC_CTX *ctx;
 426
 427         fstrcpy(wcard, "*");
 428
 429         if (opt_long_list_entries) {
 430                 only_ours = False;
 431         }
 432
 433         switch (argc) {
 434                 case 0:
 435                         break;
 436                 case 1:
 437                         fstrcpy(wcard, argv[0]);
 438                         break;
 439                 default:
 440                         return net_usershare_info_usage(argc, argv);
 441         }
 442
 443         strlower_m(wcard);
 444
 445         ctx = talloc_init("share_info");
 446         ret = get_share_list(ctx, wcard, only_ours);
 447         if (ret) {
 448                 return ret;
 449         }
 450
 451         pi.ctx = ctx;
 452         pi.op = US_INFO_OP;
 453
 454         ret = process_share_list(info_fn, &pi);
 455         talloc_destroy(ctx);
 456         return ret;
 457 }
 458
 459 /***************************************************************************
 460  Count the current total number of usershares.
 461 ***************************************************************************/
 462
 463 static int count_num_usershares(void)
 464 {
 465         SMB_STRUCT_DIR *dp;
 466         SMB_STRUCT_DIRENT *de;
 467         pstring basepath;
 468         int num_usershares = 0;
 469
 470         get_basepath(basepath);
 471         dp = sys_opendir(basepath);
 472         if (!dp) {
 473                 d_fprintf(stderr, "count_num_usershares: cannot open usershare directory %s. Error %s\n",
 474                         basepath, strerror(errno) );
 475                 return -1;
 476         }
 477
 478         while((de = sys_readdir(dp)) != 0) {
 479                 SMB_STRUCT_STAT sbuf;
 480                 pstring path;
 481                 const char *n = de->d_name;
 482
 483                 /* Ignore . and .. */
 484                 if (*n == '.') {
 485                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 486                                 continue;
 487                         }
 488                 }
 489
 490                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 491                         d_fprintf(stderr, "count_num_usershares: ignoring bad share name %s\n",n);
 492                         continue;
 493                 }
 494                 pstrcpy(path, basepath);
 495                 pstrcat(path, "/");
 496                 pstrcat(path, n);
 497
 498                 if (sys_lstat(path, &sbuf) != 0) {
 499                         d_fprintf(stderr, "count_num_usershares: can't lstat file %s. Error was %s\n",
 500                                 path, strerror(errno) );
 501                         continue;
 502                 }
 503
 504                 if (!S_ISREG(sbuf.st_mode)) {
 505                         d_fprintf(stderr, "count_num_usershares: file %s is not a regular file. Ignoring.\n",
 506                                 path );
 507                         continue;
 508                 }
 509                 num_usershares++;
 510         }
 511
 512         sys_closedir(dp);
 513         return num_usershares;
 514 }
 515
 516 /***************************************************************************
 517  Add a single userlevel share.
 518 ***************************************************************************/
 519
 520 static int net_usershare_add(int argc, const char **argv)
 521 {
 522         TALLOC_CTX *ctx = NULL;
 523         SMB_STRUCT_STAT sbuf;
 524         SMB_STRUCT_STAT lsbuf;
 525         char *sharename;
 526         pstring full_path;
 527         pstring full_path_tmp;
 528         const char *us_path;
 529         const char *us_comment;
 530         const char *arg_acl;
 531         char *us_acl;
 532         char *file_img;
 533         int num_aces = 0;
 534         int i;
 535         int tmpfd;
 536         const char *pacl;
 537         size_t to_write;
 538         uid_t myeuid = geteuid();
 539         bool guest_ok = False;
 540         int num_usershares;
 541
 542         us_comment = "";
 543         arg_acl = "S-1-1-0:R";
 544
 545         switch (argc) {
 546                 case 0:
 547                 case 1:
 548                 default:
 549                         return net_usershare_add_usage(argc, argv);
 550                 case 2:
 551                         sharename = strdup_lower(argv[0]);
 552                         us_path = argv[1];
 553                         break;
 554                 case 3:
 555                         sharename = strdup_lower(argv[0]);
 556                         us_path = argv[1];
 557                         us_comment = argv[2];
 558                         break;
 559                 case 4:
 560                         sharename = strdup_lower(argv[0]);
 561                         us_path = argv[1];
 562                         us_comment = argv[2];
 563                         arg_acl = argv[3];
 564                         break;
 565                 case 5:
 566                         sharename = strdup_lower(argv[0]);
 567                         us_path = argv[1];
 568                         us_comment = argv[2];
 569                         arg_acl = argv[3];
 570                         if (strlen(arg_acl) == 0) {
 571                                 arg_acl = "S-1-1-0:R";
 572                         }
 573                         if (!strnequal(argv[4], "guest_ok=", 9)) {
 574                                 return net_usershare_add_usage(argc, argv);
 575                         }
 576                         switch (argv[4][9]) {
 577                                 case 'y':
 578                                 case 'Y':
 579                                         guest_ok = True;
 580                                         break;
 581                                 case 'n':
 582                                 case 'N':
 583                                         guest_ok = False;
 584                                         break;
 585                                 default:
 586                                         return net_usershare_add_usage(argc, argv);
 587                         }
 588                         break;
 589         }
 590
 591         /* Ensure we're under the "usershare max shares" number. Advisory only. */
 592         num_usershares = count_num_usershares();
 593         if (num_usershares >= lp_usershare_max_shares()) {
 594                 d_fprintf(stderr, "net usershare add: maximum number of allowed usershares (%d) reached\n",
 595                         lp_usershare_max_shares() );
 596                 SAFE_FREE(sharename);
 597                 return -1;
 598         }
 599
 600         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 601                 d_fprintf(stderr, "net usershare add: share name %s contains "
 602                         "invalid characters (any of %s)\n",
 603                         sharename, INVALID_SHARENAME_CHARS);
 604                 SAFE_FREE(sharename);
 605                 return -1;
 606         }
 607
 608         /* Disallow shares the same as users. */
 609         if (getpwnam(sharename)) {
 610                 d_fprintf(stderr, "net usershare add: share name %s is already a valid system user name\n",
 611                         sharename );
 612                 SAFE_FREE(sharename);
 613                 return -1;
 614         }
 615
 616         /* Construct the full path for the usershare file. */
 617         get_basepath(full_path);
 618         pstrcat(full_path, "/");
 619         pstrcpy(full_path_tmp, full_path);
 620         pstrcat(full_path, sharename);
 621         pstrcat(full_path_tmp, ":tmpXXXXXX");
 622
 623         /* The path *must* be absolute. */
 624         if (us_path[0] != '/') {
 625                 d_fprintf(stderr,"net usershare add: path %s is not an absolute path.\n",
 626                         us_path);
 627                 SAFE_FREE(sharename);
 628                 return -1;
 629         }
 630
 631         /* Check the directory to be shared exists. */
 632         if (sys_stat(us_path, &sbuf) != 0) {
 633                 d_fprintf(stderr, "net usershare add: cannot stat path %s to ensure "
 634                         "this is a directory. Error was %s\n",
 635                         us_path, strerror(errno) );
 636                 SAFE_FREE(sharename);
 637                 return -1;
 638         }
 639
 640         if (!S_ISDIR(sbuf.st_mode)) {
 641                 d_fprintf(stderr, "net usershare add: path %s is not a directory.\n",
 642                         us_path );
 643                 SAFE_FREE(sharename);
 644                 return -1;
 645         }
 646
 647         /* If we're not root, check if we're restricted to sharing out directories
 648            that we own only. */
 649
 650         if ((myeuid != 0) && lp_usershare_owner_only() && (myeuid != sbuf.st_uid)) {
 651                 d_fprintf(stderr, "net usershare add: cannot share path %s as "
 652                         "we are restricted to only sharing directories we own.\n"
 653                         "\tAsk the administrator to add the line \"usershare owner only = False\" \n"
 654                         "\tto the [global] section of the smb.conf to allow this.\n",
 655                         us_path );
 656                 SAFE_FREE(sharename);
 657                 return -1;
 658         }
 659
 660         /* No validation needed on comment. Now go through and validate the
 661            acl string. Convert names to SID's as needed. Then run it through
 662            parse_usershare_acl to ensure it's valid. */
 663
 664         ctx = talloc_init("share_info");
 665
 666         /* Start off the string we'll append to. */
 667         us_acl = talloc_strdup(ctx, "");
 668
 669         pacl = arg_acl;
 670         num_aces = 1;
 671
 672         /* Add the number of ',' characters to get the number of aces. */
 673         num_aces += count_chars(pacl,',');
 674
 675         for (i = 0; i < num_aces; i++) {
 676                 DOM_SID sid;
 677                 const char *pcolon = strchr_m(pacl, ':');
 678                 const char *name;
 679
 680                 if (pcolon == NULL) {
 681                         d_fprintf(stderr, "net usershare add: malformed acl %s (missing ':').\n",
 682                                 pacl );
 683                         talloc_destroy(ctx);
 684                         SAFE_FREE(sharename);
 685                         return -1;
 686                 }
 687
 688                 switch(pcolon[1]) {
 689                         case 'f':
 690                         case 'F':
 691                         case 'd':
 692                         case 'r':
 693                         case 'R':
 694                                 break;
 695                         default:
 696                                 d_fprintf(stderr, "net usershare add: malformed acl %s "
 697                                         "(access control must be 'r', 'f', or 'd')\n",
 698                                         pacl );
 699                                 talloc_destroy(ctx);
 700                                 SAFE_FREE(sharename);
 701                                 return -1;
 702                 }
 703
 704                 if (pcolon[2] != ',' && pcolon[2] != '\0') {
 705                         d_fprintf(stderr, "net usershare add: malformed terminating character for acl %s\n",
 706                                 pacl );
 707                         talloc_destroy(ctx);
 708                         SAFE_FREE(sharename);
 709                         return -1;
 710                 }
 711
 712                 /* Get the name */
 713                 if ((name = talloc_strndup(ctx, pacl, pcolon - pacl)) == NULL) {
 714                         d_fprintf(stderr, "talloc_strndup failed\n");
 715                         talloc_destroy(ctx);
 716                         SAFE_FREE(sharename);
 717                         return -1;
 718                 }
 719                 if (!string_to_sid(&sid, name)) {
 720                         /* Convert to a SID */
 721                         NTSTATUS ntstatus = net_lookup_sid_from_name(ctx, name, &sid);
 722                         if (!NT_STATUS_IS_OK(ntstatus)) {
 723                                 d_fprintf(stderr, "net usershare add: cannot convert name \"%s\" to a SID. %s.",
 724                                         name, get_friendly_nt_error_msg(ntstatus) );
 725                                 if (NT_STATUS_EQUAL(ntstatus, NT_STATUS_CONNECTION_REFUSED)) {
 726                                         d_fprintf(stderr,  " Maybe smbd is not running.\n");
 727                                 } else {
 728                                         d_fprintf(stderr, "\n");
 729                                 }
 730                                 talloc_destroy(ctx);
 731                                 SAFE_FREE(sharename);
 732                                 return -1;
 733                         }
 734                 }
 735                 us_acl = talloc_asprintf_append(us_acl, "%s:%c,", sid_string_static(&sid), pcolon[1]);
 736
 737                 /* Move to the next ACL entry. */
 738                 if (pcolon[2] == ',') {
 739                         pacl = &pcolon[3];
 740                 }
 741         }
 742
 743         /* Remove the last ',' */
 744         us_acl[strlen(us_acl)-1] = '\0';
 745
 746         if (guest_ok && !lp_usershare_allow_guests()) {
 747                 d_fprintf(stderr, "net usershare add: guest_ok=y requested "
 748                         "but the \"usershare allow guests\" parameter is not enabled "
 749                         "by this server.\n");
 750                 talloc_destroy(ctx);
 751                 SAFE_FREE(sharename);
 752                 return -1;
 753         }
 754
 755         /* Create a temporary filename for this share. */
 756         tmpfd = smb_mkstemp(full_path_tmp);
 757
 758         if (tmpfd == -1) {
 759                 d_fprintf(stderr, "net usershare add: cannot create tmp file %s\n",
 760                                 full_path_tmp );
 761                 talloc_destroy(ctx);
 762                 SAFE_FREE(sharename);
 763                 return -1;
 764         }
 765
 766         /* Ensure we opened the file we thought we did. */
 767         if (sys_lstat(full_path_tmp, &lsbuf) != 0) {
 768                 d_fprintf(stderr, "net usershare add: cannot lstat tmp file %s\n",
 769                                 full_path_tmp );
 770                 talloc_destroy(ctx);
 771                 SAFE_FREE(sharename);
 772                 return -1;
 773         }
 774
 775         /* Check this is the same as the file we opened. */
 776         if (sys_fstat(tmpfd, &sbuf) != 0) {
 777                 d_fprintf(stderr, "net usershare add: cannot fstat tmp file %s\n",
 778                                 full_path_tmp );
 779                 talloc_destroy(ctx);
 780                 SAFE_FREE(sharename);
 781                 return -1;
 782         }
 783
 784         if (!S_ISREG(sbuf.st_mode) || sbuf.st_dev != lsbuf.st_dev || sbuf.st_ino != lsbuf.st_ino) {
 785                 d_fprintf(stderr, "net usershare add: tmp file %s is not a regular file ?\n",
 786                                 full_path_tmp );
 787                 talloc_destroy(ctx);
 788                 SAFE_FREE(sharename);
 789                 return -1;
 790         }
 791
 792         if (fchmod(tmpfd, 0644) == -1) {
 793                 d_fprintf(stderr, "net usershare add: failed to fchmod tmp file %s to 0644n",
 794                                 full_path_tmp );
 795                 talloc_destroy(ctx);
 796                 SAFE_FREE(sharename);
 797                 return -1;
 798         }
 799
 800         /* Create the in-memory image of the file. */
 801         file_img = talloc_strdup(ctx, "#VERSION 2\npath=");
 802         file_img = talloc_asprintf_append(file_img, "%s\ncomment=%s\nusershare_acl=%s\nguest_ok=%c\n",
 803                         us_path, us_comment, us_acl, guest_ok ? 'y' : 'n');
 804
 805         to_write = strlen(file_img);
 806
 807         if (write(tmpfd, file_img, to_write) != to_write) {
 808                 d_fprintf(stderr, "net usershare add: failed to write %u bytes to file %s. Error was %s\n",
 809                         (unsigned int)to_write, full_path_tmp, strerror(errno));
 810                 unlink(full_path_tmp);
 811                 talloc_destroy(ctx);
 812                 SAFE_FREE(sharename);
 813                 return -1;
 814         }
 815
 816         /* Attempt to replace any existing share by this name. */
 817         if (rename(full_path_tmp, full_path) != 0) {
 818                 unlink(full_path_tmp);
 819                 d_fprintf(stderr, "net usershare add: failed to add share %s. Error was %s\n",
 820                         sharename, strerror(errno));
 821                 talloc_destroy(ctx);
 822                 close(tmpfd);
 823                 SAFE_FREE(sharename);
 824                 return -1;
 825         }
 826
 827         close(tmpfd);
 828         talloc_destroy(ctx);
 829
 830         if (opt_long_list_entries) {
 831                 const char *my_argv[2];
 832                 my_argv[0] = sharename;
 833                 my_argv[1] = NULL;
 834                 net_usershare_info(1, my_argv);
 835         }
 836
 837         SAFE_FREE(sharename);
 838         return 0;
 839 }
 840
 841 #if 0
 842 /***************************************************************************
 843  List function.
 844 ***************************************************************************/
 845
 846 static int list_fn(struct file_list *fl, void *priv)
 847 {
 848         d_printf("%s\n", fl->pathname);
 849         return 0;
 850 }
 851 #endif
 852
 853 /***************************************************************************
 854  List userlevel shares.
 855 ***************************************************************************/
 856
 857 static int net_usershare_list(int argc, const char **argv)
 858 {
 859         fstring wcard;
 860         bool only_ours = True;
 861         int ret = -1;
 862         struct us_priv_info pi;
 863         TALLOC_CTX *ctx;
 864
 865         fstrcpy(wcard, "*");
 866
 867         if (opt_long_list_entries) {
 868                 only_ours = False;
 869         }
 870
 871         switch (argc) {
 872                 case 0:
 873                         break;
 874                 case 1:
 875                         fstrcpy(wcard, argv[0]);
 876                         break;
 877                 default:
 878                         return net_usershare_list_usage(argc, argv);
 879         }
 880
 881         strlower_m(wcard);
 882
 883         ctx = talloc_init("share_list");
 884         ret = get_share_list(ctx, wcard, only_ours);
 885         if (ret) {
 886                 return ret;
 887         }
 888
 889         pi.ctx = ctx;
 890         pi.op = US_LIST_OP;
 891
 892         ret = process_share_list(info_fn, &pi);
 893         talloc_destroy(ctx);
 894         return ret;
 895 }
 896
 897 /***************************************************************************
 898  Handle "net usershare help *" subcommands.
 899 ***************************************************************************/
 900
 901 int net_usershare_help(int argc, const char **argv)
 902 {
 903         struct functable func[] = {
 904                 {"ADD", net_usershare_add_usage},
 905                 {"DELETE", net_usershare_delete_usage},
 906                 {"INFO", net_usershare_info_usage},
 907                 {"LIST", net_usershare_list_usage},
 908                 {NULL, NULL}};
 909
 910         return net_run_function(argc, argv, func, net_usershare_usage);
 911 }
 912
 913 /***************************************************************************
 914  Entry-point for all the USERSHARE functions.
 915 ***************************************************************************/
 916
 917 int net_usershare(int argc, const char **argv)
 918 {
 919         SMB_STRUCT_DIR *dp;
 920
 921         struct functable func[] = {
 922                 {"ADD", net_usershare_add},
 923                 {"DELETE", net_usershare_delete},
 924                 {"INFO", net_usershare_info},
 925                 {"LIST", net_usershare_list},
 926                 {"HELP", net_usershare_help},
 927                 {NULL, NULL}
 928         };
 929
 930         if (lp_usershare_max_shares() == 0) {
 931                 d_fprintf(stderr, "net usershare: usershares are currently disabled\n");
 932                 return -1;
 933         }
 934
 935         dp = sys_opendir(lp_usershare_path());
 936         if (!dp) {
 937                 int err = errno;
 938                 d_fprintf(stderr, "net usershare: cannot open usershare directory %s. Error %s\n",
 939                         lp_usershare_path(), strerror(err) );
 940                 if (err == EACCES) {
 941                         d_fprintf(stderr, "You do not have permission to create a usershare. Ask your "
 942                                 "administrator to grant you permissions to create a share.\n");
 943                 } else if (err == ENOENT) {
 944                         d_fprintf(stderr, "Please ask your system administrator to "
 945                                 "enable user sharing.\n");
 946                 }
 947                 return -1;
 948         }
 949         sys_closedir(dp);
 950
 951         return net_run_function(argc, argv, func, net_usershare_usage);
 952 }