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 "utils/net.h"
  24 #include "../libcli/security/security.h"
  25
  26 struct {
  27         const char *us_errstr;
  28         enum usershare_err us_err;
  29 } us_errs [] = {
  30         {"",USERSHARE_OK},
  31         {N_("Malformed usershare file"), USERSHARE_MALFORMED_FILE},
  32         {N_("Bad version number"), USERSHARE_BAD_VERSION},
  33         {N_("Malformed path entry"), USERSHARE_MALFORMED_PATH},
  34         {N_("Malformed comment entryfile"), USERSHARE_MALFORMED_COMMENT_DEF},
  35         {N_("Malformed acl definition"), USERSHARE_MALFORMED_ACL_DEF},
  36         {N_("Acl parse error"), USERSHARE_ACL_ERR},
  37         {N_("Path not absolute"), USERSHARE_PATH_NOT_ABSOLUTE},
  38         {N_("Path is denied"), USERSHARE_PATH_IS_DENIED},
  39         {N_("Path not allowed"), USERSHARE_PATH_NOT_ALLOWED},
  40         {N_("Path is not a directory"), USERSHARE_PATH_NOT_DIRECTORY},
  41         {N_("System error"), USERSHARE_POSIX_ERR},
  42         {N_("Malformed sharename definition"), USERSHARE_MALFORMED_SHARENAME_DEF},
  43         {N_("Bad sharename (doesn't match filename)"), USERSHARE_BAD_SHARENAME},
  44         {NULL,(enum usershare_err)-1}
  45 };
  46
  47 static const char *get_us_error_code(enum usershare_err us_err)
  48 {
  49         char *result;
  50         int idx = 0;
  51
  52         while (us_errs[idx].us_errstr != NULL) {
  53                 if (us_errs[idx].us_err == us_err) {
  54                         return us_errs[idx].us_errstr;
  55                 }
  56                 idx++;
  57         }
  58
  59         result = talloc_asprintf(talloc_tos(), _("Usershare error code (0x%x)"),
  60                                  (unsigned int)us_err);
  61         SMB_ASSERT(result != NULL);
  62         return result;
  63 }
  64
  65 /* The help subsystem for the USERSHARE subcommand */
  66
  67 static int net_usershare_add_usage(struct net_context *c, int argc, const char **argv)
  68 {
  69         char chr = *lp_winbind_separator();
  70         d_printf(_(
  71                 "net usershare add [-l|--long] <sharename> <path> [<comment>] [<acl>] [<guest_ok=[y|n]>]\n"
  72                 "\tAdds the specified share name for this user.\n"
  73                 "\t<sharename> is the new share name.\n"
  74                 "\t<path> is the path on the filesystem to export.\n"
  75                 "\t<comment> is the optional comment for the new share.\n"
  76                 "\t<acl> is an optional share acl in the format \"DOMAIN%cname:X,DOMAIN%cname:X,....\"\n"
  77                 "\t<guest_ok=y> if present sets \"guest ok = yes\" on this usershare.\n"
  78                 "\t\t\"X\" represents a permission and can be any one of the characters f, r or d\n"
  79                 "\t\twhere \"f\" means full control, \"r\" means read-only, \"d\" means deny access.\n"
  80                 "\t\tname may be a domain user or group. For local users use the local server name "
  81                 "instead of \"DOMAIN\"\n"
  82                 "\t\tThe default acl is \"Everyone:r\" which allows everyone read-only access.\n"
  83                 "\tAdd -l or --long to print the info on the newly added share.\n"),
  84                 chr, chr );
  85         return -1;
  86 }
  87
  88 static int net_usershare_delete_usage(struct net_context *c, int argc, const char **argv)
  89 {
  90         d_printf(_(
  91                 "net usershare delete <sharename>\n"
  92                 "\tdeletes the specified share name for this user.\n"));
  93         return -1;
  94 }
  95
  96 static int net_usershare_info_usage(struct net_context *c, int argc, const char **argv)
  97 {
  98         d_printf(_(
  99                 "net usershare info [-l|--long] [wildcard sharename]\n"
 100                 "\tPrints out the path, comment and acl elements of shares that match the wildcard.\n"
 101                 "\tBy default only gives info on shares owned by the current user\n"
 102                 "\tAdd -l or --long to apply this to all shares\n"
 103                 "\tOmit the sharename or use a wildcard of '*' to see all shares\n"));
 104         return -1;
 105 }
 106
 107 static int net_usershare_list_usage(struct net_context *c, int argc, const char **argv)
 108 {
 109         d_printf(_(
 110                 "net usershare list [-l|--long] [wildcard sharename]\n"
 111                 "\tLists the names of all shares that match the wildcard.\n"
 112                 "\tBy default only lists shares owned by the current user\n"
 113                 "\tAdd -l or --long to apply this to all shares\n"
 114                 "\tOmit the sharename or use a wildcard of '*' to see all shares\n"));
 115         return -1;
 116 }
 117
 118 int net_usershare_usage(struct net_context *c, int argc, const char **argv)
 119 {
 120         d_printf(_("net usershare add <sharename> <path> [<comment>] [<acl>] [<guest_ok=[y|n]>] to "
 121                                 "add or change a user defined share.\n"
 122                 "net usershare delete <sharename> to delete a user defined share.\n"
 123                 "net usershare info [-l|--long] [wildcard sharename] to print info about a user defined share.\n"
 124                 "net usershare list [-l|--long] [wildcard sharename] to list user defined shares.\n"
 125                 "net usershare help\n"
 126                 "\nType \"net usershare help <option>\" to get more information on that option\n\n"));
 127
 128         net_common_flags_usage(c, argc, argv);
 129         return -1;
 130 }
 131
 132 /***************************************************************************
 133 ***************************************************************************/
 134
 135 static char *get_basepath(TALLOC_CTX *ctx)
 136 {
 137         char *basepath = talloc_strdup(ctx, lp_usershare_path());
 138
 139         if (!basepath) {
 140                 return NULL;
 141         }
 142         if ((basepath[0] != '\0') && (basepath[strlen(basepath)-1] == '/')) {
 143                 basepath[strlen(basepath)-1] = '\0';
 144         }
 145         return basepath;
 146 }
 147
 148 /***************************************************************************
 149  Delete a single userlevel share.
 150 ***************************************************************************/
 151
 152 static int net_usershare_delete(struct net_context *c, int argc, const char **argv)
 153 {
 154         char *us_path;
 155         char *sharename;
 156
 157         if (argc != 1 || c->display_usage) {
 158                 return net_usershare_delete_usage(c, argc, argv);
 159         }
 160
 161         if ((sharename = strlower_talloc(talloc_tos(), argv[0])) == NULL) {
 162                 d_fprintf(stderr, _("strlower_talloc failed\n"));
 163                 return -1;
 164         }
 165
 166         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 167                 d_fprintf(stderr, _("net usershare delete: share name %s contains "
 168                         "invalid characters (any of %s)\n"),
 169                         sharename, INVALID_SHARENAME_CHARS);
 170                 TALLOC_FREE(sharename);
 171                 return -1;
 172         }
 173
 174         us_path = talloc_asprintf(talloc_tos(),
 175                                 "%s/%s",
 176                                 lp_usershare_path(),
 177                                 sharename);
 178         if (!us_path) {
 179                 TALLOC_FREE(sharename);
 180                 return -1;
 181         }
 182
 183         if (unlink(us_path) != 0) {
 184                 d_fprintf(stderr, _("net usershare delete: unable to remove usershare %s. "
 185                         "Error was %s\n"),
 186                         us_path, strerror(errno));
 187                 TALLOC_FREE(sharename);
 188                 return -1;
 189         }
 190         TALLOC_FREE(sharename);
 191         return 0;
 192 }
 193
 194 /***************************************************************************
 195  Data structures to handle a list of usershare files.
 196 ***************************************************************************/
 197
 198 struct file_list {
 199         struct file_list *next, *prev;
 200         const char *pathname;
 201 };
 202
 203 static struct file_list *flist;
 204
 205 /***************************************************************************
 206 ***************************************************************************/
 207
 208 static int get_share_list(TALLOC_CTX *ctx, const char *wcard, bool only_ours)
 209 {
 210         SMB_STRUCT_DIR *dp;
 211         SMB_STRUCT_DIRENT *de;
 212         uid_t myuid = geteuid();
 213         struct file_list *fl = NULL;
 214         char *basepath = get_basepath(ctx);
 215
 216         if (!basepath) {
 217                 return -1;
 218         }
 219         dp = sys_opendir(basepath);
 220         if (!dp) {
 221                 d_fprintf(stderr,
 222                         _("get_share_list: cannot open usershare directory %s. "
 223                           "Error %s\n"),
 224                         basepath, strerror(errno) );
 225                 return -1;
 226         }
 227
 228         while((de = sys_readdir(dp)) != 0) {
 229                 SMB_STRUCT_STAT sbuf;
 230                 char *path;
 231                 const char *n = de->d_name;
 232
 233                 /* Ignore . and .. */
 234                 if (*n == '.') {
 235                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 236                                 continue;
 237                         }
 238                 }
 239
 240                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 241                         d_fprintf(stderr,
 242                                   _("get_share_list: ignoring bad share "
 243                                     "name %s\n"), n);
 244                         continue;
 245                 }
 246                 path = talloc_asprintf(ctx,
 247                                         "%s/%s",
 248                                         basepath,
 249                                         n);
 250                 if (!path) {
 251                         sys_closedir(dp);
 252                         return -1;
 253                 }
 254
 255                 if (sys_lstat(path, &sbuf, false) != 0) {
 256                         d_fprintf(stderr,
 257                                 _("get_share_list: can't lstat file %s. Error "
 258                                   "was %s\n"),
 259                                 path, strerror(errno) );
 260                         continue;
 261                 }
 262
 263                 if (!S_ISREG(sbuf.st_ex_mode)) {
 264                         d_fprintf(stderr,
 265                                   _("get_share_list: file %s is not a regular "
 266                                     "file. Ignoring.\n"),
 267                                 path );
 268                         continue;
 269                 }
 270
 271                 if (only_ours && sbuf.st_ex_uid != myuid) {
 272                         continue;
 273                 }
 274
 275                 if (!unix_wild_match(wcard, n)) {
 276                         continue;
 277                 }
 278
 279                 /* (Finally) - add to list. */
 280                 fl = TALLOC_P(ctx, struct file_list);
 281                 if (!fl) {
 282                         sys_closedir(dp);
 283                         return -1;
 284                 }
 285                 fl->pathname = talloc_strdup(ctx, n);
 286                 if (!fl->pathname) {
 287                         sys_closedir(dp);
 288                         return -1;
 289                 }
 290
 291                 DLIST_ADD(flist, fl);
 292         }
 293
 294         sys_closedir(dp);
 295         return 0;
 296 }
 297
 298 enum us_priv_op { US_LIST_OP, US_INFO_OP};
 299
 300 struct us_priv_info {
 301         TALLOC_CTX *ctx;
 302         enum us_priv_op op;
 303         struct net_context *c;
 304 };
 305
 306 /***************************************************************************
 307  Call a function for every share on the list.
 308 ***************************************************************************/
 309
 310 static int process_share_list(int (*fn)(struct file_list *, void *), void *priv)
 311 {
 312         struct file_list *fl;
 313         int ret = 0;
 314
 315         for (fl = flist; fl; fl = fl->next) {
 316                 ret = (*fn)(fl, priv);
 317         }
 318
 319         return ret;
 320 }
 321
 322 /***************************************************************************
 323  Info function.
 324 ***************************************************************************/
 325
 326 static int info_fn(struct file_list *fl, void *priv)
 327 {
 328         SMB_STRUCT_STAT sbuf;
 329         char **lines = NULL;
 330         struct us_priv_info *pi = (struct us_priv_info *)priv;
 331         TALLOC_CTX *ctx = pi->ctx;
 332         struct net_context *c = pi->c;
 333         int fd = -1;
 334         int numlines = 0;
 335         struct security_descriptor *psd = NULL;
 336         char *basepath;
 337         char *sharepath = NULL;
 338         char *comment = NULL;
 339         char *cp_sharename = NULL;
 340         char *acl_str;
 341         int num_aces;
 342         char sep_str[2];
 343         enum usershare_err us_err;
 344         bool guest_ok = false;
 345
 346         sep_str[0] = *lp_winbind_separator();
 347         sep_str[1] = '\0';
 348
 349         basepath = get_basepath(ctx);
 350         if (!basepath) {
 351                 return -1;
 352         }
 353         basepath = talloc_asprintf_append(basepath,
 354                         "/%s",
 355                         fl->pathname);
 356         if (!basepath) {
 357                 return -1;
 358         }
 359
 360 #ifdef O_NOFOLLOW
 361         fd = sys_open(basepath, O_RDONLY|O_NOFOLLOW, 0);
 362 #else
 363         fd = sys_open(basepath, O_RDONLY, 0);
 364 #endif
 365
 366         if (fd == -1) {
 367                 d_fprintf(stderr, _("info_fn: unable to open %s. %s\n"),
 368                         basepath, strerror(errno) );
 369                 return -1;
 370         }
 371
 372         /* Paranoia... */
 373         if (sys_fstat(fd, &sbuf, false) != 0) {
 374                 d_fprintf(stderr,
 375                         _("info_fn: can't fstat file %s. Error was %s\n"),
 376                         basepath, strerror(errno) );
 377                 close(fd);
 378                 return -1;
 379         }
 380
 381         if (!S_ISREG(sbuf.st_ex_mode)) {
 382                 d_fprintf(stderr,
 383                         _("info_fn: file %s is not a regular file. Ignoring.\n"),
 384                         basepath );
 385                 close(fd);
 386                 return -1;
 387         }
 388
 389         lines = fd_lines_load(fd, &numlines, 10240, NULL);
 390         close(fd);
 391
 392         if (lines == NULL) {
 393                 return -1;
 394         }
 395
 396         /* Ensure it's well formed. */
 397         us_err = parse_usershare_file(ctx, &sbuf, fl->pathname, -1, lines, numlines,
 398                                 &sharepath,
 399                                 &comment,
 400                                 &cp_sharename,
 401                                 &psd,
 402                                 &guest_ok);
 403
 404         TALLOC_FREE(lines);
 405
 406         if (us_err != USERSHARE_OK) {
 407                 d_fprintf(stderr,
 408                         _("info_fn: file %s is not a well formed usershare "
 409                           "file.\n"),
 410                         basepath );
 411                 d_fprintf(stderr, _("info_fn: Error was %s.\n"),
 412                         get_us_error_code(us_err) );
 413                 return -1;
 414         }
 415
 416         acl_str = talloc_strdup(ctx, "usershare_acl=");
 417         if (!acl_str) {
 418                 return -1;
 419         }
 420
 421         for (num_aces = 0; num_aces < psd->dacl->num_aces; num_aces++) {
 422                 const char *domain;
 423                 const char *name;
 424                 NTSTATUS ntstatus;
 425
 426                 ntstatus = net_lookup_name_from_sid(c, ctx,
 427                                                     &psd->dacl->aces[num_aces].trustee,
 428                                                     &domain, &name);
 429
 430                 if (NT_STATUS_IS_OK(ntstatus)) {
 431                         if (domain && *domain) {
 432                                 acl_str = talloc_asprintf_append(acl_str,
 433                                                 "%s%s",
 434                                                 domain,
 435                                                 sep_str);
 436                                 if (!acl_str) {
 437                                         return -1;
 438                                 }
 439                         }
 440                         acl_str = talloc_asprintf_append(acl_str,
 441                                                 "%s",
 442                                                 name);
 443                         if (!acl_str) {
 444                                 return -1;
 445                         }
 446
 447                 } else {
 448                         fstring sidstr;
 449                         sid_to_fstring(sidstr,
 450                                        &psd->dacl->aces[num_aces].trustee);
 451                         acl_str = talloc_asprintf_append(acl_str,
 452                                                 "%s",
 453                                                 sidstr);
 454                         if (!acl_str) {
 455                                 return -1;
 456                         }
 457                 }
 458                 acl_str = talloc_asprintf_append(acl_str, ":");
 459                 if (!acl_str) {
 460                         return -1;
 461                 }
 462
 463                 if (psd->dacl->aces[num_aces].type == SEC_ACE_TYPE_ACCESS_DENIED) {
 464                         acl_str = talloc_asprintf_append(acl_str, "D,");
 465                         if (!acl_str) {
 466                                 return -1;
 467                         }
 468                 } else {
 469                         if (psd->dacl->aces[num_aces].access_mask & GENERIC_ALL_ACCESS) {
 470                                 acl_str = talloc_asprintf_append(acl_str, "F,");
 471                         } else {
 472                                 acl_str = talloc_asprintf_append(acl_str, "R,");
 473                         }
 474                         if (!acl_str) {
 475                                 return -1;
 476                         }
 477                 }
 478         }
 479
 480         /* NOTE: This is smb.conf-like output. Do not translate. */
 481         if (pi->op == US_INFO_OP) {
 482                 d_printf("[%s]\n", cp_sharename );
 483                 d_printf("path=%s\n", sharepath );
 484                 d_printf("comment=%s\n", comment);
 485                 d_printf("%s\n", acl_str);
 486                 d_printf("guest_ok=%c\n\n", guest_ok ? 'y' : 'n');
 487         } else if (pi->op == US_LIST_OP) {
 488                 d_printf("%s\n", cp_sharename);
 489         }
 490
 491         return 0;
 492 }
 493
 494 /***************************************************************************
 495  Print out info (internal detail) on userlevel shares.
 496 ***************************************************************************/
 497
 498 static int net_usershare_info(struct net_context *c, int argc, const char **argv)
 499 {
 500         fstring wcard;
 501         bool only_ours = true;
 502         int ret = -1;
 503         struct us_priv_info pi;
 504         TALLOC_CTX *ctx;
 505
 506         fstrcpy(wcard, "*");
 507
 508         if (c->display_usage)
 509                 return net_usershare_info_usage(c, argc, argv);
 510
 511         if (c->opt_long_list_entries) {
 512                 only_ours = false;
 513         }
 514
 515         switch (argc) {
 516                 case 0:
 517                         break;
 518                 case 1:
 519                         fstrcpy(wcard, argv[0]);
 520                         break;
 521                 default:
 522                         return net_usershare_info_usage(c, argc, argv);
 523         }
 524
 525         strlower_m(wcard);
 526
 527         ctx = talloc_init("share_info");
 528         ret = get_share_list(ctx, wcard, only_ours);
 529         if (ret) {
 530                 return ret;
 531         }
 532
 533         pi.ctx = ctx;
 534         pi.op = US_INFO_OP;
 535         pi.c = c;
 536
 537         ret = process_share_list(info_fn, &pi);
 538         talloc_destroy(ctx);
 539         return ret;
 540 }
 541
 542 /***************************************************************************
 543  Count the current total number of usershares.
 544 ***************************************************************************/
 545
 546 static int count_num_usershares(void)
 547 {
 548         SMB_STRUCT_DIR *dp;
 549         SMB_STRUCT_DIRENT *de;
 550         int num_usershares = 0;
 551         TALLOC_CTX *ctx = talloc_tos();
 552         char *basepath = get_basepath(ctx);
 553
 554         if (!basepath) {
 555                 return -1;
 556         }
 557
 558         dp = sys_opendir(basepath);
 559         if (!dp) {
 560                 d_fprintf(stderr,
 561                         _("count_num_usershares: cannot open usershare "
 562                           "directory %s. Error %s\n"),
 563                         basepath, strerror(errno) );
 564                 return -1;
 565         }
 566
 567         while((de = sys_readdir(dp)) != 0) {
 568                 SMB_STRUCT_STAT sbuf;
 569                 char *path;
 570                 const char *n = de->d_name;
 571
 572                 /* Ignore . and .. */
 573                 if (*n == '.') {
 574                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 575                                 continue;
 576                         }
 577                 }
 578
 579                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 580                         d_fprintf(stderr,
 581                                   _("count_num_usershares: ignoring bad share "
 582                                     "name %s\n"), n);
 583                         continue;
 584                 }
 585                 path = talloc_asprintf(ctx,
 586                                 "%s/%s",
 587                                 basepath,
 588                                 n);
 589                 if (!path) {
 590                         sys_closedir(dp);
 591                         return -1;
 592                 }
 593
 594                 if (sys_lstat(path, &sbuf, false) != 0) {
 595                         d_fprintf(stderr,
 596                                 _("count_num_usershares: can't lstat file %s. "
 597                                   "Error was %s\n"),
 598                                 path, strerror(errno) );
 599                         continue;
 600                 }
 601
 602                 if (!S_ISREG(sbuf.st_ex_mode)) {
 603                         d_fprintf(stderr,
 604                                 _("count_num_usershares: file %s is not a "
 605                                   "regular file. Ignoring.\n"),
 606                                 path );
 607                         continue;
 608                 }
 609                 num_usershares++;
 610         }
 611
 612         sys_closedir(dp);
 613         return num_usershares;
 614 }
 615
 616 /***************************************************************************
 617  Add a single userlevel share.
 618 ***************************************************************************/
 619
 620 static int net_usershare_add(struct net_context *c, int argc, const char **argv)
 621 {
 622         TALLOC_CTX *ctx = talloc_stackframe();
 623         SMB_STRUCT_STAT sbuf;
 624         SMB_STRUCT_STAT lsbuf;
 625         char *sharename;
 626         const char *cp_sharename;
 627         char *full_path;
 628         char *full_path_tmp;
 629         const char *us_path;
 630         const char *us_comment;
 631         const char *arg_acl;
 632         char *us_acl;
 633         char *file_img;
 634         int num_aces = 0;
 635         int i;
 636         int tmpfd;
 637         const char *pacl;
 638         size_t to_write;
 639         uid_t myeuid = geteuid();
 640         bool guest_ok = false;
 641         int num_usershares;
 642
 643         us_comment = "";
 644         arg_acl = "S-1-1-0:R";
 645
 646         if (c->display_usage)
 647                 return net_usershare_add_usage(c, argc, argv);
 648
 649         switch (argc) {
 650                 case 0:
 651                 case 1:
 652                 default:
 653                         return net_usershare_add_usage(c, argc, argv);
 654                 case 2:
 655                         cp_sharename = argv[0];
 656                         sharename = strlower_talloc(ctx, argv[0]);
 657                         us_path = argv[1];
 658                         break;
 659                 case 3:
 660                         cp_sharename = argv[0];
 661                         sharename = strlower_talloc(ctx, argv[0]);
 662                         us_path = argv[1];
 663                         us_comment = argv[2];
 664                         break;
 665                 case 4:
 666                         cp_sharename = argv[0];
 667                         sharename = strlower_talloc(ctx, argv[0]);
 668                         us_path = argv[1];
 669                         us_comment = argv[2];
 670                         arg_acl = argv[3];
 671                         break;
 672                 case 5:
 673                         cp_sharename = argv[0];
 674                         sharename = strlower_talloc(ctx, argv[0]);
 675                         us_path = argv[1];
 676                         us_comment = argv[2];
 677                         arg_acl = argv[3];
 678                         if (strlen(arg_acl) == 0) {
 679                                 arg_acl = "S-1-1-0:R";
 680                         }
 681                         if (!strnequal(argv[4], "guest_ok=", 9)) {
 682                                 TALLOC_FREE(ctx);
 683                                 return net_usershare_add_usage(c, argc, argv);
 684                         }
 685                         switch (argv[4][9]) {
 686                                 case 'y':
 687                                 case 'Y':
 688                                         guest_ok = true;
 689                                         break;
 690                                 case 'n':
 691                                 case 'N':
 692                                         guest_ok = false;
 693                                         break;
 694                                 default:
 695                                         TALLOC_FREE(ctx);
 696                                         return net_usershare_add_usage(c, argc, argv);
 697                         }
 698                         break;
 699         }
 700
 701         /* Ensure we're under the "usershare max shares" number. Advisory only. */
 702         num_usershares = count_num_usershares();
 703         if (num_usershares >= lp_usershare_max_shares()) {
 704                 d_fprintf(stderr,
 705                         _("net usershare add: maximum number of allowed "
 706                           "usershares (%d) reached\n"),
 707                         lp_usershare_max_shares() );
 708                 TALLOC_FREE(ctx);
 709                 return -1;
 710         }
 711
 712         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 713                 d_fprintf(stderr, _("net usershare add: share name %s contains "
 714                         "invalid characters (any of %s)\n"),
 715                         sharename, INVALID_SHARENAME_CHARS);
 716                 TALLOC_FREE(ctx);
 717                 return -1;
 718         }
 719
 720         /* Disallow shares the same as users. */
 721         if (getpwnam(sharename)) {
 722                 d_fprintf(stderr,
 723                         _("net usershare add: share name %s is already a valid "
 724                           "system user name\n"),
 725                         sharename );
 726                 TALLOC_FREE(ctx);
 727                 return -1;
 728         }
 729
 730         /* Construct the full path for the usershare file. */
 731         full_path = get_basepath(ctx);
 732         if (!full_path) {
 733                 TALLOC_FREE(ctx);
 734                 return -1;
 735         }
 736         full_path_tmp = talloc_asprintf(ctx,
 737                         "%s/:tmpXXXXXX",
 738                         full_path);
 739         if (!full_path_tmp) {
 740                 TALLOC_FREE(ctx);
 741                 return -1;
 742         }
 743
 744         full_path = talloc_asprintf_append(full_path,
 745                                         "/%s",
 746                                         sharename);
 747         if (!full_path) {
 748                 TALLOC_FREE(ctx);
 749                 return -1;
 750         }
 751
 752         /* The path *must* be absolute. */
 753         if (us_path[0] != '/') {
 754                 d_fprintf(stderr,
 755                         _("net usershare add: path %s is not an absolute "
 756                           "path.\n"),
 757                         us_path);
 758                 TALLOC_FREE(ctx);
 759                 return -1;
 760         }
 761
 762         /* Check the directory to be shared exists. */
 763         if (sys_stat(us_path, &sbuf, false) != 0) {
 764                 d_fprintf(stderr,
 765                         _("net usershare add: cannot stat path %s to ensure "
 766                           "this is a directory. Error was %s\n"),
 767                         us_path, strerror(errno) );
 768                 TALLOC_FREE(ctx);
 769                 return -1;
 770         }
 771
 772         if (!S_ISDIR(sbuf.st_ex_mode)) {
 773                 d_fprintf(stderr,
 774                         _("net usershare add: path %s is not a directory.\n"),
 775                         us_path );
 776                 TALLOC_FREE(ctx);
 777                 return -1;
 778         }
 779
 780         /* If we're not root, check if we're restricted to sharing out directories
 781            that we own only. */
 782
 783         if ((myeuid != 0) && lp_usershare_owner_only() && (myeuid != sbuf.st_ex_uid)) {
 784                 d_fprintf(stderr, _("net usershare add: cannot share path %s as "
 785                         "we are restricted to only sharing directories we own.\n"
 786                         "\tAsk the administrator to add the line \"usershare owner only = false\" \n"
 787                         "\tto the [global] section of the smb.conf to allow this.\n"),
 788                         us_path );
 789                 TALLOC_FREE(ctx);
 790                 return -1;
 791         }
 792
 793         /* No validation needed on comment. Now go through and validate the
 794            acl string. Convert names to SID's as needed. Then run it through
 795            parse_usershare_acl to ensure it's valid. */
 796
 797         /* Start off the string we'll append to. */
 798         us_acl = talloc_strdup(ctx, "");
 799         if (!us_acl) {
 800                 TALLOC_FREE(ctx);
 801                 return -1;
 802         }
 803
 804         pacl = arg_acl;
 805         num_aces = 1;
 806
 807         /* Add the number of ',' characters to get the number of aces. */
 808         num_aces += count_chars(pacl,',');
 809
 810         for (i = 0; i < num_aces; i++) {
 811                 struct dom_sid sid;
 812                 const char *pcolon = strchr_m(pacl, ':');
 813                 const char *name;
 814
 815                 if (pcolon == NULL) {
 816                         d_fprintf(stderr,
 817                                 _("net usershare add: malformed acl %s "
 818                                   "(missing ':').\n"),
 819                                 pacl );
 820                         TALLOC_FREE(ctx);
 821                         return -1;
 822                 }
 823
 824                 switch(pcolon[1]) {
 825                         case 'f':
 826                         case 'F':
 827                         case 'd':
 828                         case 'r':
 829                         case 'R':
 830                                 break;
 831                         default:
 832                                 d_fprintf(stderr,
 833                                         _("net usershare add: malformed acl %s "
 834                                           "(access control must be 'r', 'f', "
 835                                           "or 'd')\n"),
 836                                         pacl );
 837                                 TALLOC_FREE(ctx);
 838                                 return -1;
 839                 }
 840
 841                 if (pcolon[2] != ',' && pcolon[2] != '\0') {
 842                         d_fprintf(stderr,
 843                                 _("net usershare add: malformed terminating "
 844                                   "character for acl %s\n"),
 845                                 pacl );
 846                         TALLOC_FREE(ctx);
 847                         return -1;
 848                 }
 849
 850                 /* Get the name */
 851                 if ((name = talloc_strndup(ctx, pacl, pcolon - pacl)) == NULL) {
 852                         d_fprintf(stderr, _("talloc_strndup failed\n"));
 853                         TALLOC_FREE(ctx);
 854                         return -1;
 855                 }
 856                 if (!string_to_sid(&sid, name)) {
 857                         /* Convert to a SID */
 858                         NTSTATUS ntstatus = net_lookup_sid_from_name(c, ctx, name, &sid);
 859                         if (!NT_STATUS_IS_OK(ntstatus)) {
 860                                 d_fprintf(stderr,
 861                                         _("net usershare add: cannot convert "
 862                                           "name \"%s\" to a SID. %s."),
 863                                         name, get_friendly_nt_error_msg(ntstatus) );
 864                                 if (NT_STATUS_EQUAL(ntstatus, NT_STATUS_CONNECTION_REFUSED)) {
 865                                         d_fprintf(stderr,
 866                                             _(" Maybe smbd is not running.\n"));
 867                                 } else {
 868                                         d_fprintf(stderr, "\n");
 869                                 }
 870                                 TALLOC_FREE(ctx);
 871                                 return -1;
 872                         }
 873                 }
 874                 us_acl = talloc_asprintf_append(
 875                         us_acl, "%s:%c,", sid_string_tos(&sid), pcolon[1]);
 876
 877                 /* Move to the next ACL entry. */
 878                 if (pcolon[2] == ',') {
 879                         pacl = &pcolon[3];
 880                 }
 881         }
 882
 883         /* Remove the last ',' */
 884         us_acl[strlen(us_acl)-1] = '\0';
 885
 886         if (guest_ok && !lp_usershare_allow_guests()) {
 887                 d_fprintf(stderr, _("net usershare add: guest_ok=y requested "
 888                         "but the \"usershare allow guests\" parameter is not "
 889                         "enabled by this server.\n"));
 890                 TALLOC_FREE(ctx);
 891                 return -1;
 892         }
 893
 894         /* Create a temporary filename for this share. */
 895         tmpfd = mkstemp(full_path_tmp);
 896
 897         if (tmpfd == -1) {
 898                 d_fprintf(stderr,
 899                           _("net usershare add: cannot create tmp file %s\n"),
 900                           full_path_tmp );
 901                 TALLOC_FREE(ctx);
 902                 return -1;
 903         }
 904
 905         /* Ensure we opened the file we thought we did. */
 906         if (sys_lstat(full_path_tmp, &lsbuf, false) != 0) {
 907                 d_fprintf(stderr,
 908                           _("net usershare add: cannot lstat tmp file %s\n"),
 909                           full_path_tmp );
 910                 TALLOC_FREE(ctx);
 911                 close(tmpfd);
 912                 return -1;
 913         }
 914
 915         /* Check this is the same as the file we opened. */
 916         if (sys_fstat(tmpfd, &sbuf, false) != 0) {
 917                 d_fprintf(stderr,
 918                           _("net usershare add: cannot fstat tmp file %s\n"),
 919                           full_path_tmp );
 920                 TALLOC_FREE(ctx);
 921                 close(tmpfd);
 922                 return -1;
 923         }
 924
 925         if (!S_ISREG(sbuf.st_ex_mode) || sbuf.st_ex_dev != lsbuf.st_ex_dev || sbuf.st_ex_ino != lsbuf.st_ex_ino) {
 926                 d_fprintf(stderr,
 927                           _("net usershare add: tmp file %s is not a regular "
 928                             "file ?\n"),
 929                           full_path_tmp );
 930                 TALLOC_FREE(ctx);
 931                 close(tmpfd);
 932                 return -1;
 933         }
 934
 935         if (fchmod(tmpfd, 0644) == -1) {
 936                 d_fprintf(stderr,
 937                           _("net usershare add: failed to fchmod tmp file %s "
 938                             "to 0644n"),
 939                           full_path_tmp );
 940                 TALLOC_FREE(ctx);
 941                 close(tmpfd);
 942                 return -1;
 943         }
 944
 945         /* Create the in-memory image of the file. */
 946         file_img = talloc_strdup(ctx, "#VERSION 2\npath=");
 947         file_img = talloc_asprintf_append(file_img,
 948                         "%s\ncomment=%s\nusershare_acl=%s\n"
 949                         "guest_ok=%c\nsharename=%s\n",
 950                         us_path,
 951                         us_comment,
 952                         us_acl,
 953                         guest_ok ? 'y' : 'n',
 954                         cp_sharename);
 955
 956         to_write = strlen(file_img);
 957
 958         if (write(tmpfd, file_img, to_write) != to_write) {
 959                 d_fprintf(stderr,
 960                         _("net usershare add: failed to write %u bytes to "
 961                           "file %s. Error was %s\n"),
 962                         (unsigned int)to_write, full_path_tmp, strerror(errno));
 963                 unlink(full_path_tmp);
 964                 TALLOC_FREE(ctx);
 965                 close(tmpfd);
 966                 return -1;
 967         }
 968
 969         /* Attempt to replace any existing share by this name. */
 970         if (rename(full_path_tmp, full_path) != 0) {
 971                 unlink(full_path_tmp);
 972                 d_fprintf(stderr,
 973                         _("net usershare add: failed to add share %s. Error "
 974                           "was %s\n"),
 975                         sharename, strerror(errno));
 976                 TALLOC_FREE(ctx);
 977                 close(tmpfd);
 978                 return -1;
 979         }
 980
 981         close(tmpfd);
 982
 983         if (c->opt_long_list_entries) {
 984                 const char *my_argv[2];
 985                 my_argv[0] = sharename;
 986                 my_argv[1] = NULL;
 987                 net_usershare_info(c, 1, my_argv);
 988         }
 989
 990         TALLOC_FREE(ctx);
 991         return 0;
 992 }
 993
 994 #if 0
 995 /***************************************************************************
 996  List function.
 997 ***************************************************************************/
 998
 999 static int list_fn(struct file_list *fl, void *priv)
1000 {
1001         d_printf("%s\n", fl->pathname);
1002         return 0;
1003 }
1004 #endif
1005
1006 /***************************************************************************
1007  List userlevel shares.
1008 ***************************************************************************/
1009
1010 static int net_usershare_list(struct net_context *c, int argc,
1011                               const char **argv)
1012 {
1013         fstring wcard;
1014         bool only_ours = true;
1015         int ret = -1;
1016         struct us_priv_info pi;
1017         TALLOC_CTX *ctx;
1018
1019         fstrcpy(wcard, "*");
1020
1021         if (c->display_usage)
1022                 return net_usershare_list_usage(c, argc, argv);
1023
1024         if (c->opt_long_list_entries) {
1025                 only_ours = false;
1026         }
1027
1028         switch (argc) {
1029                 case 0:
1030                         break;
1031                 case 1:
1032                         fstrcpy(wcard, argv[0]);
1033                         break;
1034                 default:
1035                         return net_usershare_list_usage(c, argc, argv);
1036         }
1037
1038         strlower_m(wcard);
1039
1040         ctx = talloc_init("share_list");
1041         ret = get_share_list(ctx, wcard, only_ours);
1042         if (ret) {
1043                 return ret;
1044         }
1045
1046         pi.ctx = ctx;
1047         pi.op = US_LIST_OP;
1048         pi.c = c;
1049
1050         ret = process_share_list(info_fn, &pi);
1051         talloc_destroy(ctx);
1052         return ret;
1053 }
1054
1055 /***************************************************************************
1056  Entry-point for all the USERSHARE functions.
1057 ***************************************************************************/
1058
1059 int net_usershare(struct net_context *c, int argc, const char **argv)
1060 {
1061         SMB_STRUCT_DIR *dp;
1062
1063         struct functable func[] = {
1064                 {
1065                         "add",
1066                         net_usershare_add,
1067                         NET_TRANSPORT_LOCAL,
1068                         N_("Add/modify user defined share"),
1069                         N_("net usershare add\n"
1070                            "    Add/modify user defined share")
1071                 },
1072                 {
1073                         "delete",
1074                         net_usershare_delete,
1075                         NET_TRANSPORT_LOCAL,
1076                         N_("Delete user defined share"),
1077                         N_("net usershare delete\n"
1078                            "    Delete user defined share")
1079                 },
1080                 {
1081                         "info",
1082                         net_usershare_info,
1083                         NET_TRANSPORT_LOCAL,
1084                         N_("Display information about a user defined share"),
1085                         N_("net usershare info\n"
1086                            "    Display information about a user defined share")
1087                 },
1088                 {
1089                         "list",
1090                         net_usershare_list,
1091                         NET_TRANSPORT_LOCAL,
1092                         N_("List user defined shares"),
1093                         N_("net usershare list\n"
1094                            "    List user defined shares")
1095                 },
1096                 {NULL, NULL, 0, NULL, NULL}
1097         };
1098
1099         if (lp_usershare_max_shares() == 0) {
1100                 d_fprintf(stderr,
1101                           _("net usershare: usershares are currently "
1102                             "disabled\n"));
1103                 return -1;
1104         }
1105
1106         dp = sys_opendir(lp_usershare_path());
1107         if (!dp) {
1108                 int err = errno;
1109                 d_fprintf(stderr,
1110                         _("net usershare: cannot open usershare directory %s. "
1111                           "Error %s\n"),
1112                         lp_usershare_path(), strerror(err) );
1113                 if (err == EACCES) {
1114                         d_fprintf(stderr,
1115                                 _("You do not have permission to create a "
1116                                 "usershare. Ask your administrator to grant "
1117                                 "you permissions to create a share.\n"));
1118                 } else if (err == ENOENT) {
1119                         d_fprintf(stderr,
1120                                 _("Please ask your system administrator to "
1121                                   "enable user sharing.\n"));
1122                 }
1123                 return -1;
1124         }
1125         sys_closedir(dp);
1126
1127         return net_run_function(c, argc, argv, "net usershare", func);
1128 }