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 = talloc_strdup(ctx, lp_usershare_path());
 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(),
 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         strlower_m(wcard);
 527
 528         ctx = talloc_init("share_info");
 529         ret = get_share_list(ctx, wcard, only_ours);
 530         if (ret) {
 531                 return ret;
 532         }
 533
 534         pi.ctx = ctx;
 535         pi.op = US_INFO_OP;
 536         pi.c = c;
 537
 538         ret = process_share_list(info_fn, &pi);
 539         talloc_destroy(ctx);
 540         return ret;
 541 }
 542
 543 /***************************************************************************
 544  Count the current total number of usershares.
 545 ***************************************************************************/
 546
 547 static int count_num_usershares(void)
 548 {
 549         DIR *dp;
 550         struct dirent *de;
 551         int num_usershares = 0;
 552         TALLOC_CTX *ctx = talloc_tos();
 553         char *basepath = get_basepath(ctx);
 554
 555         if (!basepath) {
 556                 return -1;
 557         }
 558
 559         dp = opendir(basepath);
 560         if (!dp) {
 561                 d_fprintf(stderr,
 562                         _("count_num_usershares: cannot open usershare "
 563                           "directory %s. Error %s\n"),
 564                         basepath, strerror(errno) );
 565                 return -1;
 566         }
 567
 568         while((de = readdir(dp)) != 0) {
 569                 SMB_STRUCT_STAT sbuf;
 570                 char *path;
 571                 const char *n = de->d_name;
 572
 573                 /* Ignore . and .. */
 574                 if (*n == '.') {
 575                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
 576                                 continue;
 577                         }
 578                 }
 579
 580                 if (!validate_net_name(n, INVALID_SHARENAME_CHARS, strlen(n))) {
 581                         d_fprintf(stderr,
 582                                   _("count_num_usershares: ignoring bad share "
 583                                     "name %s\n"), n);
 584                         continue;
 585                 }
 586                 path = talloc_asprintf(ctx,
 587                                 "%s/%s",
 588                                 basepath,
 589                                 n);
 590                 if (!path) {
 591                         closedir(dp);
 592                         return -1;
 593                 }
 594
 595                 if (sys_lstat(path, &sbuf, false) != 0) {
 596                         d_fprintf(stderr,
 597                                 _("count_num_usershares: can't lstat file %s. "
 598                                   "Error was %s\n"),
 599                                 path, strerror(errno) );
 600                         continue;
 601                 }
 602
 603                 if (!S_ISREG(sbuf.st_ex_mode)) {
 604                         d_fprintf(stderr,
 605                                 _("count_num_usershares: file %s is not a "
 606                                   "regular file. Ignoring.\n"),
 607                                 path );
 608                         continue;
 609                 }
 610                 num_usershares++;
 611         }
 612
 613         closedir(dp);
 614         return num_usershares;
 615 }
 616
 617 /***************************************************************************
 618  Add a single userlevel share.
 619 ***************************************************************************/
 620
 621 static int net_usershare_add(struct net_context *c, int argc, const char **argv)
 622 {
 623         TALLOC_CTX *ctx = talloc_stackframe();
 624         SMB_STRUCT_STAT sbuf;
 625         SMB_STRUCT_STAT lsbuf;
 626         char *sharename;
 627         const char *cp_sharename;
 628         char *full_path;
 629         char *full_path_tmp;
 630         const char *us_path;
 631         const char *us_comment;
 632         const char *arg_acl;
 633         char *us_acl;
 634         char *file_img;
 635         int num_aces = 0;
 636         int i;
 637         int tmpfd;
 638         const char *pacl;
 639         size_t to_write;
 640         uid_t myeuid = geteuid();
 641         bool guest_ok = false;
 642         int num_usershares;
 643
 644         us_comment = "";
 645         arg_acl = "S-1-1-0:R";
 646
 647         if (c->display_usage)
 648                 return net_usershare_add_usage(c, argc, argv);
 649
 650         switch (argc) {
 651                 case 0:
 652                 case 1:
 653                 default:
 654                         return net_usershare_add_usage(c, argc, argv);
 655                 case 2:
 656                         cp_sharename = argv[0];
 657                         sharename = strlower_talloc(ctx, argv[0]);
 658                         us_path = argv[1];
 659                         break;
 660                 case 3:
 661                         cp_sharename = argv[0];
 662                         sharename = strlower_talloc(ctx, argv[0]);
 663                         us_path = argv[1];
 664                         us_comment = argv[2];
 665                         break;
 666                 case 4:
 667                         cp_sharename = argv[0];
 668                         sharename = strlower_talloc(ctx, argv[0]);
 669                         us_path = argv[1];
 670                         us_comment = argv[2];
 671                         arg_acl = argv[3];
 672                         break;
 673                 case 5:
 674                         cp_sharename = argv[0];
 675                         sharename = strlower_talloc(ctx, argv[0]);
 676                         us_path = argv[1];
 677                         us_comment = argv[2];
 678                         arg_acl = argv[3];
 679                         if (strlen(arg_acl) == 0) {
 680                                 arg_acl = "S-1-1-0:R";
 681                         }
 682                         if (!strnequal(argv[4], "guest_ok=", 9)) {
 683                                 TALLOC_FREE(ctx);
 684                                 return net_usershare_add_usage(c, argc, argv);
 685                         }
 686                         switch (argv[4][9]) {
 687                                 case 'y':
 688                                 case 'Y':
 689                                         guest_ok = true;
 690                                         break;
 691                                 case 'n':
 692                                 case 'N':
 693                                         guest_ok = false;
 694                                         break;
 695                                 default:
 696                                         TALLOC_FREE(ctx);
 697                                         return net_usershare_add_usage(c, argc, argv);
 698                         }
 699                         break;
 700         }
 701
 702         /* Ensure we're under the "usershare max shares" number. Advisory only. */
 703         num_usershares = count_num_usershares();
 704         if (num_usershares >= lp_usershare_max_shares()) {
 705                 d_fprintf(stderr,
 706                         _("net usershare add: maximum number of allowed "
 707                           "usershares (%d) reached\n"),
 708                         lp_usershare_max_shares() );
 709                 TALLOC_FREE(ctx);
 710                 return -1;
 711         }
 712
 713         if (!validate_net_name(sharename, INVALID_SHARENAME_CHARS, strlen(sharename))) {
 714                 d_fprintf(stderr, _("net usershare add: share name %s contains "
 715                         "invalid characters (any of %s)\n"),
 716                         sharename, INVALID_SHARENAME_CHARS);
 717                 TALLOC_FREE(ctx);
 718                 return -1;
 719         }
 720
 721         /* Disallow shares the same as users. */
 722         if (getpwnam(sharename)) {
 723                 d_fprintf(stderr,
 724                         _("net usershare add: share name %s is already a valid "
 725                           "system user name\n"),
 726                         sharename );
 727                 TALLOC_FREE(ctx);
 728                 return -1;
 729         }
 730
 731         /* Construct the full path for the usershare file. */
 732         full_path = get_basepath(ctx);
 733         if (!full_path) {
 734                 TALLOC_FREE(ctx);
 735                 return -1;
 736         }
 737         full_path_tmp = talloc_asprintf(ctx,
 738                         "%s/:tmpXXXXXX",
 739                         full_path);
 740         if (!full_path_tmp) {
 741                 TALLOC_FREE(ctx);
 742                 return -1;
 743         }
 744
 745         full_path = talloc_asprintf_append(full_path,
 746                                         "/%s",
 747                                         sharename);
 748         if (!full_path) {
 749                 TALLOC_FREE(ctx);
 750                 return -1;
 751         }
 752
 753         /* The path *must* be absolute. */
 754         if (us_path[0] != '/') {
 755                 d_fprintf(stderr,
 756                         _("net usershare add: path %s is not an absolute "
 757                           "path.\n"),
 758                         us_path);
 759                 TALLOC_FREE(ctx);
 760                 return -1;
 761         }
 762
 763         /* Check the directory to be shared exists. */
 764         if (sys_stat(us_path, &sbuf, false) != 0) {
 765                 d_fprintf(stderr,
 766                         _("net usershare add: cannot stat path %s to ensure "
 767                           "this is a directory. Error was %s\n"),
 768                         us_path, strerror(errno) );
 769                 TALLOC_FREE(ctx);
 770                 return -1;
 771         }
 772
 773         if (!S_ISDIR(sbuf.st_ex_mode)) {
 774                 d_fprintf(stderr,
 775                         _("net usershare add: path %s is not a directory.\n"),
 776                         us_path );
 777                 TALLOC_FREE(ctx);
 778                 return -1;
 779         }
 780
 781         /* If we're not root, check if we're restricted to sharing out directories
 782            that we own only. */
 783
 784         if ((myeuid != 0) && lp_usershare_owner_only() && (myeuid != sbuf.st_ex_uid)) {
 785                 d_fprintf(stderr, _("net usershare add: cannot share path %s as "
 786                         "we are restricted to only sharing directories we own.\n"
 787                         "\tAsk the administrator to add the line \"usershare owner only = false\" \n"
 788                         "\tto the [global] section of the smb.conf to allow this.\n"),
 789                         us_path );
 790                 TALLOC_FREE(ctx);
 791                 return -1;
 792         }
 793
 794         /* No validation needed on comment. Now go through and validate the
 795            acl string. Convert names to SID's as needed. Then run it through
 796            parse_usershare_acl to ensure it's valid. */
 797
 798         /* Start off the string we'll append to. */
 799         us_acl = talloc_strdup(ctx, "");
 800         if (!us_acl) {
 801                 TALLOC_FREE(ctx);
 802                 return -1;
 803         }
 804
 805         pacl = arg_acl;
 806         num_aces = 1;
 807
 808         /* Add the number of ',' characters to get the number of aces. */
 809         num_aces += count_chars(pacl,',');
 810
 811         for (i = 0; i < num_aces; i++) {
 812                 struct dom_sid sid;
 813                 const char *pcolon = strchr_m(pacl, ':');
 814                 const char *name;
 815
 816                 if (pcolon == NULL) {
 817                         d_fprintf(stderr,
 818                                 _("net usershare add: malformed acl %s "
 819                                   "(missing ':').\n"),
 820                                 pacl );
 821                         TALLOC_FREE(ctx);
 822                         return -1;
 823                 }
 824
 825                 switch(pcolon[1]) {
 826                         case 'f':
 827                         case 'F':
 828                         case 'd':
 829                         case 'r':
 830                         case 'R':
 831                                 break;
 832                         default:
 833                                 d_fprintf(stderr,
 834                                         _("net usershare add: malformed acl %s "
 835                                           "(access control must be 'r', 'f', "
 836                                           "or 'd')\n"),
 837                                         pacl );
 838                                 TALLOC_FREE(ctx);
 839                                 return -1;
 840                 }
 841
 842                 if (pcolon[2] != ',' && pcolon[2] != '\0') {
 843                         d_fprintf(stderr,
 844                                 _("net usershare add: malformed terminating "
 845                                   "character for acl %s\n"),
 846                                 pacl );
 847                         TALLOC_FREE(ctx);
 848                         return -1;
 849                 }
 850
 851                 /* Get the name */
 852                 if ((name = talloc_strndup(ctx, pacl, pcolon - pacl)) == NULL) {
 853                         d_fprintf(stderr, _("talloc_strndup failed\n"));
 854                         TALLOC_FREE(ctx);
 855                         return -1;
 856                 }
 857                 if (!string_to_sid(&sid, name)) {
 858                         /* Convert to a SID */
 859                         NTSTATUS ntstatus = net_lookup_sid_from_name(c, ctx, name, &sid);
 860                         if (!NT_STATUS_IS_OK(ntstatus)) {
 861                                 d_fprintf(stderr,
 862                                         _("net usershare add: cannot convert "
 863                                           "name \"%s\" to a SID. %s."),
 864                                         name, get_friendly_nt_error_msg(ntstatus) );
 865                                 if (NT_STATUS_EQUAL(ntstatus, NT_STATUS_CONNECTION_REFUSED)) {
 866                                         d_fprintf(stderr,
 867                                             _(" Maybe smbd is not running.\n"));
 868                                 } else {
 869                                         d_fprintf(stderr, "\n");
 870                                 }
 871                                 TALLOC_FREE(ctx);
 872                                 return -1;
 873                         }
 874                 }
 875                 us_acl = talloc_asprintf_append(
 876                         us_acl, "%s:%c,", sid_string_tos(&sid), pcolon[1]);
 877
 878                 /* Move to the next ACL entry. */
 879                 if (pcolon[2] == ',') {
 880                         pacl = &pcolon[3];
 881                 }
 882         }
 883
 884         /* Remove the last ',' */
 885         us_acl[strlen(us_acl)-1] = '\0';
 886
 887         if (guest_ok && !lp_usershare_allow_guests()) {
 888                 d_fprintf(stderr, _("net usershare add: guest_ok=y requested "
 889                         "but the \"usershare allow guests\" parameter is not "
 890                         "enabled by this server.\n"));
 891                 TALLOC_FREE(ctx);
 892                 return -1;
 893         }
 894
 895         /* Create a temporary filename for this share. */
 896         tmpfd = mkstemp(full_path_tmp);
 897
 898         if (tmpfd == -1) {
 899                 d_fprintf(stderr,
 900                           _("net usershare add: cannot create tmp file %s\n"),
 901                           full_path_tmp );
 902                 TALLOC_FREE(ctx);
 903                 return -1;
 904         }
 905
 906         /* Ensure we opened the file we thought we did. */
 907         if (sys_lstat(full_path_tmp, &lsbuf, false) != 0) {
 908                 d_fprintf(stderr,
 909                           _("net usershare add: cannot lstat tmp file %s\n"),
 910                           full_path_tmp );
 911                 TALLOC_FREE(ctx);
 912                 close(tmpfd);
 913                 return -1;
 914         }
 915
 916         /* Check this is the same as the file we opened. */
 917         if (sys_fstat(tmpfd, &sbuf, false) != 0) {
 918                 d_fprintf(stderr,
 919                           _("net usershare add: cannot fstat tmp file %s\n"),
 920                           full_path_tmp );
 921                 TALLOC_FREE(ctx);
 922                 close(tmpfd);
 923                 return -1;
 924         }
 925
 926         if (!S_ISREG(sbuf.st_ex_mode) || sbuf.st_ex_dev != lsbuf.st_ex_dev || sbuf.st_ex_ino != lsbuf.st_ex_ino) {
 927                 d_fprintf(stderr,
 928                           _("net usershare add: tmp file %s is not a regular "
 929                             "file ?\n"),
 930                           full_path_tmp );
 931                 TALLOC_FREE(ctx);
 932                 close(tmpfd);
 933                 return -1;
 934         }
 935
 936         if (fchmod(tmpfd, 0644) == -1) {
 937                 d_fprintf(stderr,
 938                           _("net usershare add: failed to fchmod tmp file %s "
 939                             "to 0644n"),
 940                           full_path_tmp );
 941                 TALLOC_FREE(ctx);
 942                 close(tmpfd);
 943                 return -1;
 944         }
 945
 946         /* Create the in-memory image of the file. */
 947         file_img = talloc_strdup(ctx, "#VERSION 2\npath=");
 948         file_img = talloc_asprintf_append(file_img,
 949                         "%s\ncomment=%s\nusershare_acl=%s\n"
 950                         "guest_ok=%c\nsharename=%s\n",
 951                         us_path,
 952                         us_comment,
 953                         us_acl,
 954                         guest_ok ? 'y' : 'n',
 955                         cp_sharename);
 956
 957         to_write = strlen(file_img);
 958
 959         if (write(tmpfd, file_img, to_write) != to_write) {
 960                 d_fprintf(stderr,
 961                         _("net usershare add: failed to write %u bytes to "
 962                           "file %s. Error was %s\n"),
 963                         (unsigned int)to_write, full_path_tmp, strerror(errno));
 964                 unlink(full_path_tmp);
 965                 TALLOC_FREE(ctx);
 966                 close(tmpfd);
 967                 return -1;
 968         }
 969
 970         /* Attempt to replace any existing share by this name. */
 971         if (rename(full_path_tmp, full_path) != 0) {
 972                 unlink(full_path_tmp);
 973                 d_fprintf(stderr,
 974                         _("net usershare add: failed to add share %s. Error "
 975                           "was %s\n"),
 976                         sharename, strerror(errno));
 977                 TALLOC_FREE(ctx);
 978                 close(tmpfd);
 979                 return -1;
 980         }
 981
 982         close(tmpfd);
 983
 984         if (c->opt_long_list_entries) {
 985                 const char *my_argv[2];
 986                 my_argv[0] = sharename;
 987                 my_argv[1] = NULL;
 988                 net_usershare_info(c, 1, my_argv);
 989         }
 990
 991         TALLOC_FREE(ctx);
 992         return 0;
 993 }
 994
 995 #if 0
 996 /***************************************************************************
 997  List function.
 998 ***************************************************************************/
 999
1000 static int list_fn(struct file_list *fl, void *priv)
1001 {
1002         d_printf("%s\n", fl->pathname);
1003         return 0;
1004 }
1005 #endif
1006
1007 /***************************************************************************
1008  List userlevel shares.
1009 ***************************************************************************/
1010
1011 static int net_usershare_list(struct net_context *c, int argc,
1012                               const char **argv)
1013 {
1014         fstring wcard;
1015         bool only_ours = true;
1016         int ret = -1;
1017         struct us_priv_info pi;
1018         TALLOC_CTX *ctx;
1019
1020         fstrcpy(wcard, "*");
1021
1022         if (c->display_usage)
1023                 return net_usershare_list_usage(c, argc, argv);
1024
1025         if (c->opt_long_list_entries) {
1026                 only_ours = false;
1027         }
1028
1029         switch (argc) {
1030                 case 0:
1031                         break;
1032                 case 1:
1033                         fstrcpy(wcard, argv[0]);
1034                         break;
1035                 default:
1036                         return net_usershare_list_usage(c, argc, argv);
1037         }
1038
1039         strlower_m(wcard);
1040
1041         ctx = talloc_init("share_list");
1042         ret = get_share_list(ctx, wcard, only_ours);
1043         if (ret) {
1044                 return ret;
1045         }
1046
1047         pi.ctx = ctx;
1048         pi.op = US_LIST_OP;
1049         pi.c = c;
1050
1051         ret = process_share_list(info_fn, &pi);
1052         talloc_destroy(ctx);
1053         return ret;
1054 }
1055
1056 /***************************************************************************
1057  Entry-point for all the USERSHARE functions.
1058 ***************************************************************************/
1059
1060 int net_usershare(struct net_context *c, int argc, const char **argv)
1061 {
1062         DIR *dp;
1063
1064         struct functable func[] = {
1065                 {
1066                         "add",
1067                         net_usershare_add,
1068                         NET_TRANSPORT_LOCAL,
1069                         N_("Add/modify user defined share"),
1070                         N_("net usershare add\n"
1071                            "    Add/modify user defined share")
1072                 },
1073                 {
1074                         "delete",
1075                         net_usershare_delete,
1076                         NET_TRANSPORT_LOCAL,
1077                         N_("Delete user defined share"),
1078                         N_("net usershare delete\n"
1079                            "    Delete user defined share")
1080                 },
1081                 {
1082                         "info",
1083                         net_usershare_info,
1084                         NET_TRANSPORT_LOCAL,
1085                         N_("Display information about a user defined share"),
1086                         N_("net usershare info\n"
1087                            "    Display information about a user defined share")
1088                 },
1089                 {
1090                         "list",
1091                         net_usershare_list,
1092                         NET_TRANSPORT_LOCAL,
1093                         N_("List user defined shares"),
1094                         N_("net usershare list\n"
1095                            "    List user defined shares")
1096                 },
1097                 {NULL, NULL, 0, NULL, NULL}
1098         };
1099
1100         if (lp_usershare_max_shares() == 0) {
1101                 d_fprintf(stderr,
1102                           _("net usershare: usershares are currently "
1103                             "disabled\n"));
1104                 return -1;
1105         }
1106
1107         dp = opendir(lp_usershare_path());
1108         if (!dp) {
1109                 int err = errno;
1110                 d_fprintf(stderr,
1111                         _("net usershare: cannot open usershare directory %s. "
1112                           "Error %s\n"),
1113                         lp_usershare_path(), strerror(err) );
1114                 if (err == EACCES) {
1115                         d_fprintf(stderr,
1116                                 _("You do not have permission to create a "
1117                                 "usershare. Ask your administrator to grant "
1118                                 "you permissions to create a share.\n"));
1119                 } else if (err == ENOENT) {
1120                         d_fprintf(stderr,
1121                                 _("Please ask your system administrator to "
1122                                   "enable user sharing.\n"));
1123                 }
1124                 return -1;
1125         }
1126         closedir(dp);
1127
1128         return net_run_function(c, argc, argv, "net usershare", func);
1129 }