source3/utils/net_usershare.c

   1 /*
   2    Samba Unix/Linux SMB client library
   3    Distributed SMB/CIFS Server Management Utility
   4
   5    Copyright (C) Jeremy Allison (jra@samba.org) 2005
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "system/passwd.h"
  23 #include "system/filesys.h"
  24 #include "utils/net.h"
  25 #include "../libcli/security/security.h"
  26
  27 struct {
  28         const char *us_errstr;
  29         enum usershare_err us_err;
  30 } us_errs [] = {
  31         {"",USERSHARE_OK},
  32         {N_("Malformed usershare file"), USERSHARE_MALFORMED_FILE},
  33         {N_("Bad version number"), USERSHARE_BAD_VERSION},
  34         {N_("Malformed path entry"), USERSHARE_MALFORMED_PATH},
  35         {N_("Malformed comment entryfile"), USERSHARE_MALFORMED_COMMENT_DEF},
  36         {N_("Malformed acl definition"), USERSHARE_MALFORMED_ACL_DEF},
  37         {N_("Acl parse error"), USERSHARE_ACL_ERR},
  38         {N_("Path not absolute"), USERSHARE_PATH_NOT_ABSOLUTE},
  39         {N_("Path is denied"), USERSHARE_PATH_IS_DENIED},
  40         {N_("Path not allowed"), USERSHARE_PATH_NOT_ALLOWED},
  41         {N_("Path is not a directory"), USERSHARE_PATH_NOT_DIRECTORY},
  42         {N_("System error"), USERSHARE_POSIX_ERR},
  43         {N_("Malformed sharename definition"), USERSHARE_MALFORMED_SHARENAME_DEF},
  44         {N_("Bad sharename (doesn't match filename)"), USERSHARE_BAD_SHARENAME},
  45         {NULL,(enum usershare_err)-1}
  46 };
  47
  48 static const char *get_us_error_code(enum usershare_err us_err)
  49 {
  50         char *result;
  51         int idx = 0;
  52
  53         while (us_errs[idx].us_errstr != NULL) {
  54                 if (us_errs[idx].us_err == us_err) {
  55                         return us_errs[idx].us_errstr;
  56                 }
  57                 idx++;
  58         }
  59
  60         result = talloc_asprintf(talloc_tos(), _("Usershare error code (0x%x)"),
  61                                  (unsigned int)us_err);
  62         SMB_ASSERT(result != NULL);
  63         return result;
  64 }
  65
  66 /* The help subsystem for the USERSHARE subcommand */
  67
  68 static int net_usershare_add_usage(struct net_context *c, int argc, const char **argv)
  69 {
  70         char chr = *lp_winbind_separator();
  71         d_printf(_(
  72                 "net usershare add [-l|--long] <sharename> <path> [<comment>] [<acl>] [<guest_ok=[y|n]>]\n"
  73                 "\tAdds the specified share name for this user.\n"
  74                 "\t<sharename> is the new share name.\n"
  75                 "\t<path> is the path on the filesystem to export.\n"
  76                 "\t<comment> is the optional comment for the new share.\n"
  77                 "\t<acl> is an optional share acl in the format \"DOMAIN%cname:X,DOMAIN%cname:X,....\"\n"
  78                 "\t<guest_ok=y> if present sets \"guest ok = yes\" on this usershare.\n"
  79                 "\t\t\"X\" represents a permission and can be any one of the characters f, r or d\n"
  80                 "\t\twhere \"f\" means full control, \"r\" means read-only, \"d\" means deny access.\n"
  81                 "\t\tname may be a domain user or group. For local users use the local server name "
  82                 "instead of \"DOMAIN\"\n"
  83                 "\t\tThe default acl is \"Everyone:r\" which allows everyone read-only access.\n"
  84                 "\tAdd -l or --long to print the info on the newly added share.\n"),
  85                 chr, chr );
  86         return -1;
  87 }
  88
  89 static int net_usershare_delete_usage(struct net_context *c, int argc, const char **argv)
  90 {
  91         d_printf(_(
  92                 "net usershare delete <sharename>\n"
  93                 "\tdeletes the specified share name for this user.\n"));
  94         return -1;
  95 }
  96
  97 static int net_usershare_info_usage(struct net_context *c, int argc, const char **argv)
  98 {
  99         d_printf(_(
 100                 "net usershare info [-l|--long] [wildcard sharename]\n"
 101                 "\tPrints out the path, comment and acl elements of shares that match the wildcard.\n"
 102                 "\tBy default only gives info on shares owned by the current user\n"
 103                 "\tAdd -l or --long to apply this to all shares\n"
 104                 "\tOmit the sharename or use a wildcard of '*' to see all shares\n"));
 105         return -1;
 106 }
 107
 108 static int net_usershare_list_usage(struct net_context *c, int argc, const char **argv)
 109 {
 110         d_printf(_(
 111                 "net usershare list [-l|--long] [wildcard sharename]\n"
 112                 "\tLists the names of all shares that match the wildcard.\n"
 113                 "\tBy default only lists shares owned by the current user\n"
 114                 "\tAdd -l or --long to apply this to all shares\n"
 115                 "\tOmit the sharename or use a wildcard of '*' to see all shares\n"));
 116         return -1;
 117 }
 118
 119 int net_usershare_usage(struct net_context *c, int argc, const char **argv)
 120 {
 121         d_printf(_("net usershare add <sharename> <path> [<comment>] [<acl>] [<guest_ok=[y|n]>] to "
 122                                 "add or change a user defined share.\n"
 123                 "net usershare delete <sharename> to delete a user defined share.\n"
 124                 "net usershare info [-l|--long] [wildcard sharename] to print info about a user defined share.\n"
 125                 "net usershare list [-l|--long] [wildcard sharename] to list user defined shares.\n"
 126                 "net usershare help\n"
 127                 "\nType \"net usershare help <option>\" to get more information on that option\n\n"));
 128
 129         net_common_flags_usage(c, argc, argv);
 130         return -1;
 131 }
 132
 133 /***************************************************************************
 134 ***************************************************************************/
 135
 136 static char *get_basepath(TALLOC_CTX *ctx)
 137 {
 138         char *basepath = lp_usershare_path(ctx);
 139
 140         if (!basepath) {
 141                 return NULL;
 142         }
 143         if ((basepath[0] != '\0') && (basepath[strlen(basepath)-1] == '/')) {
 144                 basepath[strlen(basepath)-1] = '\0';
 145         }
 146         return basepath;
 147 }
 148
 149 /***************************************************************************
 150  Delete a single userlevel share.
 151 ***************************************************************************/
 152
 153 static int net_usershare_delete(struct net_context *c, int argc, const char **argv)
 154 {
 155         char *us_path;
 156         char *sharename;
 157
 158         if (argc != 1 || c->display_usage) {
 159                 return net_usershare_delete_usage(c, argc, argv);
 160         }
 161
 162         if ((sharename = strlower_talloc(talloc_tos(), argv[0])) == NULL) {
 163                 d_fprintf(stderr, _("strlower_talloc failed\n"));
 164                 return -1;
 165         }
 166
 167         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 168                 d_fprintf(stderr, _("net usershare delete: share name %s contains "
 169                         "invalid characters (any of %s)\n"),
 170                         sharename, INVALID_SHARENAME_CHARS);
 171                 TALLOC_FREE(sharename);
 172                 return -1;
 173         }
 174
 175         us_path = talloc_asprintf(talloc_tos(),
 176                                 "%s/%s",
 177                                 lp_usershare_path(talloc_tos()),
 178                                 sharename);
 179         if (!us_path) {
 180                 TALLOC_FREE(sharename);
 181                 return -1;
 182         }
 183
 184         if (unlink(us_path) != 0) {
 185                 d_fprintf(stderr, _("net usershare delete: unable to remove usershare %s. "
 186                         "Error was %s\n"),
 187                         us_path, strerror(errno));
 188                 TALLOC_FREE(sharename);
 189                 return -1;
 190         }
 191         TALLOC_FREE(sharename);
 192         return 0;
 193 }
 194
 195 /***************************************************************************
 196  Data structures to handle a list of usershare files.
 197 ***************************************************************************/
 198
 199 struct file_list {
 200         struct file_list *next, *prev;
 201         const char *pathname;
 202 };
 203
 204 static struct file_list *flist;
 205
 206 /***************************************************************************
 207 ***************************************************************************/
 208
 209 static int get_share_list(TALLOC_CTX *ctx, const char *wcard, bool only_ours)
 210 {
 211         DIR *dp;
 212         struct dirent *de;
 213         uid_t myuid = geteuid();
 214         struct file_list *fl = NULL;
 215         char *basepath = get_basepath(ctx);
 216
 217         if (!basepath) {
 218                 return -1;
 219         }
 220         dp = opendir(basepath);
 221         if (!dp) {
 222                 d_fprintf(stderr,
 223                         _("get_share_list: cannot open usershare directory %s. "
 224                           "Error %s\n"),
 225                         basepath, strerror(errno) );
 226                 return -1;
 227         }
 228
 229         while((de = readdir(dp)) != 0) {
 230                 SMB_STRUCT_STAT sbuf;
 231                 char *path;
 232                 const char *n = de->d_name;
 233
 234                 /* Ignore . and .. */
 235                 if (*n == '.') {
 236                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 237                                 continue;
 238                         }
 239                 }
 240
 241                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 242                         d_fprintf(stderr,
 243                                   _("get_share_list: ignoring bad share "
 244                                     "name %s\n"), n);
 245                         continue;
 246                 }
 247                 path = talloc_asprintf(ctx,
 248                                         "%s/%s",
 249                                         basepath,
 250                                         n);
 251                 if (!path) {
 252                         closedir(dp);
 253                         return -1;
 254                 }
 255
 256                 if (sys_lstat(path, &sbuf, false) != 0) {
 257                         d_fprintf(stderr,
 258                                 _("get_share_list: can't lstat file %s. Error "
 259                                   "was %s\n"),
 260                                 path, strerror(errno) );
 261                         continue;
 262                 }
 263
 264                 if (!S_ISREG(sbuf.st_ex_mode)) {
 265                         d_fprintf(stderr,
 266                                   _("get_share_list: file %s is not a regular "
 267                                     "file. Ignoring.\n"),
 268                                 path );
 269                         continue;
 270                 }
 271
 272                 if (only_ours && sbuf.st_ex_uid != myuid) {
 273                         continue;
 274                 }
 275
 276                 if (!unix_wild_match(wcard, n)) {
 277                         continue;
 278                 }
 279
 280                 /* (Finally) - add to list. */
 281                 fl = talloc(ctx, struct file_list);
 282                 if (!fl) {
 283                         closedir(dp);
 284                         return -1;
 285                 }
 286                 fl->pathname = talloc_strdup(ctx, n);
 287                 if (!fl->pathname) {
 288                         closedir(dp);
 289                         return -1;
 290                 }
 291
 292                 DLIST_ADD(flist, fl);
 293         }
 294
 295         closedir(dp);
 296         return 0;
 297 }
 298
 299 enum us_priv_op { US_LIST_OP, US_INFO_OP};
 300
 301 struct us_priv_info {
 302         TALLOC_CTX *ctx;
 303         enum us_priv_op op;
 304         struct net_context *c;
 305 };
 306
 307 /***************************************************************************
 308  Call a function for every share on the list.
 309 ***************************************************************************/
 310
 311 static int process_share_list(int (*fn)(struct file_list *, void *), void *priv)
 312 {
 313         struct file_list *fl;
 314         int ret = 0;
 315
 316         for (fl = flist; fl; fl = fl->next) {
 317                 ret = (*fn)(fl, priv);
 318         }
 319
 320         return ret;
 321 }
 322
 323 /***************************************************************************
 324  Info function.
 325 ***************************************************************************/
 326
 327 static int info_fn(struct file_list *fl, void *priv)
 328 {
 329         SMB_STRUCT_STAT sbuf;
 330         char **lines = NULL;
 331         struct us_priv_info *pi = (struct us_priv_info *)priv;
 332         TALLOC_CTX *ctx = pi->ctx;
 333         struct net_context *c = pi->c;
 334         int fd = -1;
 335         int numlines = 0;
 336         struct security_descriptor *psd = NULL;
 337         char *basepath;
 338         char *sharepath = NULL;
 339         char *comment = NULL;
 340         char *cp_sharename = NULL;
 341         char *acl_str;
 342         int num_aces;
 343         char sep_str[2];
 344         enum usershare_err us_err;
 345         bool guest_ok = false;
 346
 347         sep_str[0] = *lp_winbind_separator();
 348         sep_str[1] = '\0';
 349
 350         basepath = get_basepath(ctx);
 351         if (!basepath) {
 352                 return -1;
 353         }
 354         basepath = talloc_asprintf_append(basepath,
 355                         "/%s",
 356                         fl->pathname);
 357         if (!basepath) {
 358                 return -1;
 359         }
 360
 361 #ifdef O_NOFOLLOW
 362         fd = open(basepath, O_RDONLY|O_NOFOLLOW, 0);
 363 #else
 364         fd = open(basepath, O_RDONLY, 0);
 365 #endif
 366
 367         if (fd == -1) {
 368                 d_fprintf(stderr, _("info_fn: unable to open %s. %s\n"),
 369                         basepath, strerror(errno) );
 370                 return -1;
 371         }
 372
 373         /* Paranoia... */
 374         if (sys_fstat(fd, &sbuf, false) != 0) {
 375                 d_fprintf(stderr,
 376                         _("info_fn: can't fstat file %s. Error was %s\n"),
 377                         basepath, strerror(errno) );
 378                 close(fd);
 379                 return -1;
 380         }
 381
 382         if (!S_ISREG(sbuf.st_ex_mode)) {
 383                 d_fprintf(stderr,
 384                         _("info_fn: file %s is not a regular file. Ignoring.\n"),
 385                         basepath );
 386                 close(fd);
 387                 return -1;
 388         }
 389
 390         lines = fd_lines_load(fd, &numlines, 10240, NULL);
 391         close(fd);
 392
 393         if (lines == NULL) {
 394                 return -1;
 395         }
 396
 397         /* Ensure it's well formed. */
 398         us_err = parse_usershare_file(ctx, &sbuf, fl->pathname, -1, lines, numlines,
 399                                 &sharepath,
 400                                 &comment,
 401                                 &cp_sharename,
 402                                 &psd,
 403                                 &guest_ok);
 404
 405         TALLOC_FREE(lines);
 406
 407         if (us_err != USERSHARE_OK) {
 408                 d_fprintf(stderr,
 409                         _("info_fn: file %s is not a well formed usershare "
 410                           "file.\n"),
 411                         basepath );
 412                 d_fprintf(stderr, _("info_fn: Error was %s.\n"),
 413                         get_us_error_code(us_err) );
 414                 return -1;
 415         }
 416
 417         acl_str = talloc_strdup(ctx, "usershare_acl=");
 418         if (!acl_str) {
 419                 return -1;
 420         }
 421
 422         for (num_aces = 0; num_aces < psd->dacl->num_aces; num_aces++) {
 423                 const char *domain;
 424                 const char *name;
 425                 NTSTATUS ntstatus;
 426
 427                 ntstatus = net_lookup_name_from_sid(c, ctx,
 428                                                     &psd->dacl->aces[num_aces].trustee,
 429                                                     &domain, &name);
 430
 431                 if (NT_STATUS_IS_OK(ntstatus)) {
 432                         if (domain && *domain) {
 433                                 acl_str = talloc_asprintf_append(acl_str,
 434                                                 "%s%s",
 435                                                 domain,
 436                                                 sep_str);
 437                                 if (!acl_str) {
 438                                         return -1;
 439                                 }
 440                         }
 441                         acl_str = talloc_asprintf_append(acl_str,
 442                                                 "%s",
 443                                                 name);
 444                         if (!acl_str) {
 445                                 return -1;
 446                         }
 447
 448                 } else {
 449                         fstring sidstr;
 450                         sid_to_fstring(sidstr,
 451                                        &psd->dacl->aces[num_aces].trustee);
 452                         acl_str = talloc_asprintf_append(acl_str,
 453                                                 "%s",
 454                                                 sidstr);
 455                         if (!acl_str) {
 456                                 return -1;
 457                         }
 458                 }
 459                 acl_str = talloc_asprintf_append(acl_str, ":");
 460                 if (!acl_str) {
 461                         return -1;
 462                 }
 463
 464                 if (psd->dacl->aces[num_aces].type == SEC_ACE_TYPE_ACCESS_DENIED) {
 465                         acl_str = talloc_asprintf_append(acl_str, "D,");
 466                         if (!acl_str) {
 467                                 return -1;
 468                         }
 469                 } else {
 470                         if (psd->dacl->aces[num_aces].access_mask & GENERIC_ALL_ACCESS) {
 471                                 acl_str = talloc_asprintf_append(acl_str, "F,");
 472                         } else {
 473                                 acl_str = talloc_asprintf_append(acl_str, "R,");
 474                         }
 475                         if (!acl_str) {
 476                                 return -1;
 477                         }
 478                 }
 479         }
 480
 481         /* NOTE: This is smb.conf-like output. Do not translate. */
 482         if (pi->op == US_INFO_OP) {
 483                 d_printf("[%s]\n", cp_sharename );
 484                 d_printf("path=%s\n", sharepath );
 485                 d_printf("comment=%s\n", comment);
 486                 d_printf("%s\n", acl_str);
 487                 d_printf("guest_ok=%c\n\n", guest_ok ? 'y' : 'n');
 488         } else if (pi->op == US_LIST_OP) {
 489                 d_printf("%s\n", cp_sharename);
 490         }
 491
 492         return 0;
 493 }
 494
 495 /***************************************************************************
 496  Print out info (internal detail) on userlevel shares.
 497 ***************************************************************************/
 498
 499 static int net_usershare_info(struct net_context *c, int argc, const char **argv)
 500 {
 501         fstring wcard;
 502         bool only_ours = true;
 503         int ret = -1;
 504         struct us_priv_info pi;
 505         TALLOC_CTX *ctx;
 506
 507         fstrcpy(wcard, "*");
 508
 509         if (c->display_usage)
 510                 return net_usershare_info_usage(c, argc, argv);
 511
 512         if (c->opt_long_list_entries) {
 513                 only_ours = false;
 514         }
 515
 516         switch (argc) {
 517                 case 0:
 518                         break;
 519                 case 1:
 520                         fstrcpy(wcard, argv[0]);
 521                         break;
 522                 default:
 523                         return net_usershare_info_usage(c, argc, argv);
 524         }
 525
 526         if (!strlower_m(wcard)) {
 527                 return -1;
 528         }
 529
 530         ctx = talloc_init("share_info");
 531         ret = get_share_list(ctx, wcard, only_ours);
 532         if (ret) {
 533                 return ret;
 534         }
 535
 536         pi.ctx = ctx;
 537         pi.op = US_INFO_OP;
 538         pi.c = c;
 539
 540         ret = process_share_list(info_fn, &pi);
 541         talloc_destroy(ctx);
 542         return ret;
 543 }
 544
 545 /***************************************************************************
 546  Count the current total number of usershares.
 547 ***************************************************************************/
 548
 549 static int count_num_usershares(void)
 550 {
 551         DIR *dp;
 552         struct dirent *de;
 553         int num_usershares = 0;
 554         TALLOC_CTX *ctx = talloc_tos();
 555         char *basepath = get_basepath(ctx);
 556
 557         if (!basepath) {
 558                 return -1;
 559         }
 560
 561         dp = opendir(basepath);
 562         if (!dp) {
 563                 d_fprintf(stderr,
 564                         _("count_num_usershares: cannot open usershare "
 565                           "directory %s. Error %s\n"),
 566                         basepath, strerror(errno) );
 567                 return -1;
 568         }
 569
 570         while((de = readdir(dp)) != 0) {
 571                 SMB_STRUCT_STAT sbuf;
 572                 char *path;
 573                 const char *n = de->d_name;
 574
 575                 /* Ignore . and .. */
 576                 if (*n == '.') {
 577                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 578                                 continue;
 579                         }
 580                 }
 581
 582                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 583                         d_fprintf(stderr,
 584                                   _("count_num_usershares: ignoring bad share "
 585                                     "name %s\n"), n);
 586                         continue;
 587                 }
 588                 path = talloc_asprintf(ctx,
 589                                 "%s/%s",
 590                                 basepath,
 591                                 n);
 592                 if (!path) {
 593                         closedir(dp);
 594                         return -1;
 595                 }
 596
 597                 if (sys_lstat(path, &sbuf, false) != 0) {
 598                         d_fprintf(stderr,
 599                                 _("count_num_usershares: can't lstat file %s. "
 600                                   "Error was %s\n"),
 601                                 path, strerror(errno) );
 602                         continue;
 603                 }
 604
 605                 if (!S_ISREG(sbuf.st_ex_mode)) {
 606                         d_fprintf(stderr,
 607                                 _("count_num_usershares: file %s is not a "
 608                                   "regular file. Ignoring.\n"),
 609                                 path );
 610                         continue;
 611                 }
 612                 num_usershares++;
 613         }
 614
 615         closedir(dp);
 616         return num_usershares;
 617 }
 618
 619 /***************************************************************************
 620  Add a single userlevel share.
 621 ***************************************************************************/
 622
 623 static int net_usershare_add(struct net_context *c, int argc, const char **argv)
 624 {
 625         TALLOC_CTX *ctx = talloc_stackframe();
 626         SMB_STRUCT_STAT sbuf;
 627         SMB_STRUCT_STAT lsbuf;
 628         char *sharename;
 629         const char *cp_sharename;
 630         char *full_path;
 631         char *full_path_tmp;
 632         const char *us_path;
 633         const char *us_comment;
 634         const char *arg_acl;
 635         char *us_acl;
 636         char *file_img;
 637         int num_aces = 0;
 638         int i;
 639         int tmpfd;
 640         const char *pacl;
 641         size_t to_write;
 642         uid_t myeuid = geteuid();
 643         bool guest_ok = false;
 644         int num_usershares;
 645         mode_t mask;
 646
 647         us_comment = "";
 648         arg_acl = "S-1-1-0:R";
 649
 650         if (c->display_usage)
 651                 return net_usershare_add_usage(c, argc, argv);
 652
 653         switch (argc) {
 654                 case 0:
 655                 case 1:
 656                 default:
 657                         return net_usershare_add_usage(c, argc, argv);
 658                 case 2:
 659                         cp_sharename = argv[0];
 660                         sharename = strlower_talloc(ctx, argv[0]);
 661                         us_path = argv[1];
 662                         break;
 663                 case 3:
 664                         cp_sharename = argv[0];
 665                         sharename = strlower_talloc(ctx, argv[0]);
 666                         us_path = argv[1];
 667                         us_comment = argv[2];
 668                         break;
 669                 case 4:
 670                         cp_sharename = argv[0];
 671                         sharename = strlower_talloc(ctx, argv[0]);
 672                         us_path = argv[1];
 673                         us_comment = argv[2];
 674                         arg_acl = argv[3];
 675                         break;
 676                 case 5:
 677                         cp_sharename = argv[0];
 678                         sharename = strlower_talloc(ctx, argv[0]);
 679                         us_path = argv[1];
 680                         us_comment = argv[2];
 681                         arg_acl = argv[3];
 682                         if (strlen(arg_acl) == 0) {
 683                                 arg_acl = "S-1-1-0:R";
 684                         }
 685                         if (!strnequal(argv[4], "guest_ok=", 9)) {
 686                                 TALLOC_FREE(ctx);
 687                                 return net_usershare_add_usage(c, argc, argv);
 688                         }
 689                         switch (argv[4][9]) {
 690                                 case 'y':
 691                                 case 'Y':
 692                                         guest_ok = true;
 693                                         break;
 694                                 case 'n':
 695                                 case 'N':
 696                                         guest_ok = false;
 697                                         break;
 698                                 default:
 699                                         TALLOC_FREE(ctx);
 700                                         return net_usershare_add_usage(c, argc, argv);
 701                         }
 702                         break;
 703         }
 704
 705         /* Ensure we're under the "usershare max shares" number. Advisory only. */
 706         num_usershares = count_num_usershares();
 707         if (num_usershares >= lp_usershare_max_shares()) {
 708                 d_fprintf(stderr,
 709                         _("net usershare add: maximum number of allowed "
 710                           "usershares (%d) reached\n"),
 711                         lp_usershare_max_shares() );
 712                 TALLOC_FREE(ctx);
 713                 return -1;
 714         }
 715
 716         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 717                 d_fprintf(stderr, _("net usershare add: share name %s contains "
 718                         "invalid characters (any of %s)\n"),
 719                         sharename, INVALID_SHARENAME_CHARS);
 720                 TALLOC_FREE(ctx);
 721                 return -1;
 722         }
 723
 724         /* Disallow shares the same as users. */
 725         if (getpwnam(sharename)) {
 726                 d_fprintf(stderr,
 727                         _("net usershare add: share name %s is already a valid "
 728                           "system user name\n"),
 729                         sharename );
 730                 TALLOC_FREE(ctx);
 731                 return -1;
 732         }
 733
 734         /* Construct the full path for the usershare file. */
 735         full_path = get_basepath(ctx);
 736         if (!full_path) {
 737                 TALLOC_FREE(ctx);
 738                 return -1;
 739         }
 740         full_path_tmp = talloc_asprintf(ctx,
 741                         "%s/:tmpXXXXXX",
 742                         full_path);
 743         if (!full_path_tmp) {
 744                 TALLOC_FREE(ctx);
 745                 return -1;
 746         }
 747
 748         full_path = talloc_asprintf_append(full_path,
 749                                         "/%s",
 750                                         sharename);
 751         if (!full_path) {
 752                 TALLOC_FREE(ctx);
 753                 return -1;
 754         }
 755
 756         /* The path *must* be absolute. */
 757         if (us_path[0] != '/') {
 758                 d_fprintf(stderr,
 759                         _("net usershare add: path %s is not an absolute "
 760                           "path.\n"),
 761                         us_path);
 762                 TALLOC_FREE(ctx);
 763                 return -1;
 764         }
 765
 766         /* Check the directory to be shared exists. */
 767         if (sys_stat(us_path, &sbuf, false) != 0) {
 768                 d_fprintf(stderr,
 769                         _("net usershare add: cannot stat path %s to ensure "
 770                           "this is a directory. Error was %s\n"),
 771                         us_path, strerror(errno) );
 772                 TALLOC_FREE(ctx);
 773                 return -1;
 774         }
 775
 776         if (!S_ISDIR(sbuf.st_ex_mode)) {
 777                 d_fprintf(stderr,
 778                         _("net usershare add: path %s is not a directory.\n"),
 779                         us_path );
 780                 TALLOC_FREE(ctx);
 781                 return -1;
 782         }
 783
 784         /* If we're not root, check if we're restricted to sharing out directories
 785            that we own only. */
 786
 787         if ((myeuid != 0) && lp_usershare_owner_only() && (myeuid != sbuf.st_ex_uid)) {
 788                 d_fprintf(stderr, _("net usershare add: cannot share path %s as "
 789                         "we are restricted to only sharing directories we own.\n"
 790                         "\tAsk the administrator to add the line \"usershare owner only = false\" \n"
 791                         "\tto the [global] section of the smb.conf to allow this.\n"),
 792                         us_path );
 793                 TALLOC_FREE(ctx);
 794                 return -1;
 795         }
 796
 797         /* No validation needed on comment. Now go through and validate the
 798            acl string. Convert names to SID's as needed. Then run it through
 799            parse_usershare_acl to ensure it's valid. */
 800
 801         /* Start off the string we'll append to. */
 802         us_acl = talloc_strdup(ctx, "");
 803         if (!us_acl) {
 804                 TALLOC_FREE(ctx);
 805                 return -1;
 806         }
 807
 808         pacl = arg_acl;
 809         num_aces = 1;
 810
 811         /* Add the number of ',' characters to get the number of aces. */
 812         num_aces += count_chars(pacl,',');
 813
 814         for (i = 0; i < num_aces; i++) {
 815                 struct dom_sid sid;
 816                 const char *pcolon = strchr_m(pacl, ':');
 817                 const char *name;
 818
 819                 if (pcolon == NULL) {
 820                         d_fprintf(stderr,
 821                                 _("net usershare add: malformed acl %s "
 822                                   "(missing ':').\n"),
 823                                 pacl );
 824                         TALLOC_FREE(ctx);
 825                         return -1;
 826                 }
 827
 828                 switch(pcolon[1]) {
 829                         case 'f':
 830                         case 'F':
 831                         case 'd':
 832                         case 'r':
 833                         case 'R':
 834                                 break;
 835                         default:
 836                                 d_fprintf(stderr,
 837                                         _("net usershare add: malformed acl %s "
 838                                           "(access control must be 'r', 'f', "
 839                                           "or 'd')\n"),
 840                                         pacl );
 841                                 TALLOC_FREE(ctx);
 842                                 return -1;
 843                 }
 844
 845                 if (pcolon[2] != ',' && pcolon[2] != '\0') {
 846                         d_fprintf(stderr,
 847                                 _("net usershare add: malformed terminating "
 848                                   "character for acl %s\n"),
 849                                 pacl );
 850                         TALLOC_FREE(ctx);
 851                         return -1;
 852                 }
 853
 854                 /* Get the name */
 855                 if ((name = talloc_strndup(ctx, pacl, pcolon - pacl)) == NULL) {
 856                         d_fprintf(stderr, _("talloc_strndup failed\n"));
 857                         TALLOC_FREE(ctx);
 858                         return -1;
 859                 }
 860                 if (!string_to_sid(&sid, name)) {
 861                         /* Convert to a SID */
 862                         NTSTATUS ntstatus = net_lookup_sid_from_name(c, ctx, name, &sid);
 863                         if (!NT_STATUS_IS_OK(ntstatus)) {
 864                                 d_fprintf(stderr,
 865                                         _("net usershare add: cannot convert "
 866                                           "name \"%s\" to a SID. %s."),
 867                                         name, get_friendly_nt_error_msg(ntstatus) );
 868                                 if (NT_STATUS_EQUAL(ntstatus, NT_STATUS_CONNECTION_REFUSED)) {
 869                                         d_fprintf(stderr,
 870                                             _(" Maybe smbd is not running.\n"));
 871                                 } else {
 872                                         d_fprintf(stderr, "\n");
 873                                 }
 874                                 TALLOC_FREE(ctx);
 875                                 return -1;
 876                         }
 877                 }
 878                 us_acl = talloc_asprintf_append(
 879                         us_acl, "%s:%c,", sid_string_tos(&sid), pcolon[1]);
 880
 881                 /* Move to the next ACL entry. */
 882                 if (pcolon[2] == ',') {
 883                         pacl = &pcolon[3];
 884                 }
 885         }
 886
 887         /* Remove the last ',' */
 888         us_acl[strlen(us_acl)-1] = '\0';
 889
 890         if (guest_ok && !lp_usershare_allow_guests()) {
 891                 d_fprintf(stderr, _("net usershare add: guest_ok=y requested "
 892                         "but the \"usershare allow guests\" parameter is not "
 893                         "enabled by this server.\n"));
 894                 TALLOC_FREE(ctx);
 895                 return -1;
 896         }
 897
 898         /* Create a temporary filename for this share. */
 899         mask = umask(S_IRWXO | S_IRWXG);
 900         tmpfd = mkstemp(full_path_tmp);
 901         umask(mask);
 902
 903         if (tmpfd == -1) {
 904                 d_fprintf(stderr,
 905                           _("net usershare add: cannot create tmp file %s\n"),
 906                           full_path_tmp );
 907                 TALLOC_FREE(ctx);
 908                 return -1;
 909         }
 910
 911         /* Ensure we opened the file we thought we did. */
 912         if (sys_lstat(full_path_tmp, &lsbuf, false) != 0) {
 913                 d_fprintf(stderr,
 914                           _("net usershare add: cannot lstat tmp file %s\n"),
 915                           full_path_tmp );
 916                 TALLOC_FREE(ctx);
 917                 close(tmpfd);
 918                 return -1;
 919         }
 920
 921         /* Check this is the same as the file we opened. */
 922         if (sys_fstat(tmpfd, &sbuf, false) != 0) {
 923                 d_fprintf(stderr,
 924                           _("net usershare add: cannot fstat tmp file %s\n"),
 925                           full_path_tmp );
 926                 TALLOC_FREE(ctx);
 927                 close(tmpfd);
 928                 return -1;
 929         }
 930
 931         if (!S_ISREG(sbuf.st_ex_mode) || sbuf.st_ex_dev != lsbuf.st_ex_dev || sbuf.st_ex_ino != lsbuf.st_ex_ino) {
 932                 d_fprintf(stderr,
 933                           _("net usershare add: tmp file %s is not a regular "
 934                             "file ?\n"),
 935                           full_path_tmp );
 936                 TALLOC_FREE(ctx);
 937                 close(tmpfd);
 938                 return -1;
 939         }
 940
 941         if (fchmod(tmpfd, 0644) == -1) {
 942                 d_fprintf(stderr,
 943                           _("net usershare add: failed to fchmod tmp file %s "
 944                             "to 0644n"),
 945                           full_path_tmp );
 946                 TALLOC_FREE(ctx);
 947                 close(tmpfd);
 948                 return -1;
 949         }
 950
 951         /* Create the in-memory image of the file. */
 952         file_img = talloc_strdup(ctx, "#VERSION 2\npath=");
 953         file_img = talloc_asprintf_append(file_img,
 954                         "%s\ncomment=%s\nusershare_acl=%s\n"
 955                         "guest_ok=%c\nsharename=%s\n",
 956                         us_path,
 957                         us_comment,
 958                         us_acl,
 959                         guest_ok ? 'y' : 'n',
 960                         cp_sharename);
 961
 962         to_write = strlen(file_img);
 963
 964         if (write(tmpfd, file_img, to_write) != to_write) {
 965                 d_fprintf(stderr,
 966                         _("net usershare add: failed to write %u bytes to "
 967                           "file %s. Error was %s\n"),
 968                         (unsigned int)to_write, full_path_tmp, strerror(errno));
 969                 unlink(full_path_tmp);
 970                 TALLOC_FREE(ctx);
 971                 close(tmpfd);
 972                 return -1;
 973         }
 974
 975         /* Attempt to replace any existing share by this name. */
 976         if (rename(full_path_tmp, full_path) != 0) {
 977                 unlink(full_path_tmp);
 978                 d_fprintf(stderr,
 979                         _("net usershare add: failed to add share %s. Error "
 980                           "was %s\n"),
 981                         sharename, strerror(errno));
 982                 TALLOC_FREE(ctx);
 983                 close(tmpfd);
 984                 return -1;
 985         }
 986
 987         close(tmpfd);
 988
 989         if (c->opt_long_list_entries) {
 990                 const char *my_argv[2];
 991                 my_argv[0] = sharename;
 992                 my_argv[1] = NULL;
 993                 net_usershare_info(c, 1, my_argv);
 994         }
 995
 996         TALLOC_FREE(ctx);
 997         return 0;
 998 }
 999
1000 #if 0
1001 /***************************************************************************
1002  List function.
1003 ***************************************************************************/
1004
1005 static int list_fn(struct file_list *fl, void *priv)
1006 {
1007         d_printf("%s\n", fl->pathname);
1008         return 0;
1009 }
1010 #endif
1011
1012 /***************************************************************************
1013  List userlevel shares.
1014 ***************************************************************************/
1015
1016 static int net_usershare_list(struct net_context *c, int argc,
1017                               const char **argv)
1018 {
1019         fstring wcard;
1020         bool only_ours = true;
1021         int ret = -1;
1022         struct us_priv_info pi;
1023         TALLOC_CTX *ctx;
1024
1025         fstrcpy(wcard, "*");
1026
1027         if (c->display_usage)
1028                 return net_usershare_list_usage(c, argc, argv);
1029
1030         if (c->opt_long_list_entries) {
1031                 only_ours = false;
1032         }
1033
1034         switch (argc) {
1035                 case 0:
1036                         break;
1037                 case 1:
1038                         fstrcpy(wcard, argv[0]);
1039                         break;
1040                 default:
1041                         return net_usershare_list_usage(c, argc, argv);
1042         }
1043
1044         if (!strlower_m(wcard)) {
1045                 return -1;
1046         }
1047
1048         ctx = talloc_init("share_list");
1049         ret = get_share_list(ctx, wcard, only_ours);
1050         if (ret) {
1051                 return ret;
1052         }
1053
1054         pi.ctx = ctx;
1055         pi.op = US_LIST_OP;
1056         pi.c = c;
1057
1058         ret = process_share_list(info_fn, &pi);
1059         talloc_destroy(ctx);
1060         return ret;
1061 }
1062
1063 /***************************************************************************
1064  Entry-point for all the USERSHARE functions.
1065 ***************************************************************************/
1066
1067 int net_usershare(struct net_context *c, int argc, const char **argv)
1068 {
1069         DIR *dp;
1070
1071         struct functable func[] = {
1072                 {
1073                         "add",
1074                         net_usershare_add,
1075                         NET_TRANSPORT_LOCAL,
1076                         N_("Add/modify user defined share"),
1077                         N_("net usershare add\n"
1078                            "    Add/modify user defined share")
1079                 },
1080                 {
1081                         "delete",
1082                         net_usershare_delete,
1083                         NET_TRANSPORT_LOCAL,
1084                         N_("Delete user defined share"),
1085                         N_("net usershare delete\n"
1086                            "    Delete user defined share")
1087                 },
1088                 {
1089                         "info",
1090                         net_usershare_info,
1091                         NET_TRANSPORT_LOCAL,
1092                         N_("Display information about a user defined share"),
1093                         N_("net usershare info\n"
1094                            "    Display information about a user defined share")
1095                 },
1096                 {
1097                         "list",
1098                         net_usershare_list,
1099                         NET_TRANSPORT_LOCAL,
1100                         N_("List user defined shares"),
1101                         N_("net usershare list\n"
1102                            "    List user defined shares")
1103                 },
1104                 {NULL, NULL, 0, NULL, NULL}
1105         };
1106
1107         if (lp_usershare_max_shares() == 0) {
1108                 d_fprintf(stderr,
1109                           _("net usershare: usershares are currently "
1110                             "disabled\n"));
1111                 return -1;
1112         }
1113
1114         dp = opendir(lp_usershare_path(talloc_tos()));
1115         if (!dp) {
1116                 int err = errno;
1117                 d_fprintf(stderr,
1118                         _("net usershare: cannot open usershare directory %s. "
1119                           "Error %s\n"),
1120                         lp_usershare_path(talloc_tos()), strerror(err) );
1121                 if (err == EACCES) {
1122                         d_fprintf(stderr,
1123                                 _("You do not have permission to create a "
1124                                 "usershare. Ask your administrator to grant "
1125                                 "you permissions to create a share.\n"));
1126                 } else if (err == ENOENT) {
1127                         d_fprintf(stderr,
1128                                 _("Please ask your system administrator to "
1129                                   "enable user sharing.\n"));
1130                 }
1131                 return -1;
1132         }
1133         closedir(dp);
1134
1135         return net_run_function(c, argc, argv, "net usershare", func);
1136 }