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