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