source3/utils/smbpasswd.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * Copyright (C) Jeremy Allison 1995-1998
   4  * Copyright (C) Tim Potter     2001
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 3 of the License, or (at your
   9  * option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "includes.h"
  20 #include "system/passwd.h"
  21 #include "secrets.h"
  22 #include "../librpc/gen_ndr/samr.h"
  23 #include "../lib/util/util_pw.h"
  24 #include "libsmb/proto.h"
  25 #include "passdb.h"
  26 #include "cmdline_contexts.h"
  27 #include "passwd_proto.h"
  28 #include "lib/util/string_wrappers.h"
  29
  30 /*
  31  * Next two lines needed for SunOS and don't
  32  * hurt anything else...
  33  */
  34 extern char *optarg;
  35 extern int optind;
  36
  37 /* forced running in root-mode */
  38 static bool got_username = False;
  39 static bool stdin_passwd_get = False;
  40 static fstring user_name;
  41 static char *new_passwd = NULL;
  42 static const char *remote_machine = NULL;
  43
  44 static fstring ldap_secret;
  45
  46
  47 /*********************************************************
  48  Print command usage on stderr and die.
  49 **********************************************************/
  50 static void usage(void)
  51 {
  52         printf("When run by root:\n");
  53         printf("    smbpasswd [options] [username]\n");
  54         printf("otherwise:\n");
  55         printf("    smbpasswd [options]\n\n");
  56
  57         printf("options:\n");
  58         printf("  -L                   local mode (must be first option)\n");
  59         printf("  -h                   print this usage message\n");
  60         printf("  -s                   use stdin for password prompt\n");
  61         printf("  -c smb.conf file     Use the given path to the smb.conf file\n");
  62         printf("  -D LEVEL             debug level\n");
  63         printf("  -r MACHINE           remote machine\n");
  64         printf("  -U USER              remote username (e.g. SAM/user)\n");
  65
  66         printf("extra options when run by root or in local mode:\n");
  67         printf("  -a                   add user\n");
  68         printf("  -d                   disable user\n");
  69         printf("  -e                   enable user\n");
  70         printf("  -i                   interdomain trust account\n");
  71         printf("  -m                   machine trust account\n");
  72         printf("  -n                   set no password\n");
  73         printf("  -W                   use stdin ldap admin password\n");
  74         printf("  -w PASSWORD          ldap admin password\n");
  75         printf("  -x                   delete user\n");
  76         printf("  -R ORDER             name resolve order\n");
  77
  78         exit(1);
  79 }
  80
  81 static void set_line_buffering(FILE *f)
  82 {
  83         setvbuf(f, NULL, _IOLBF, 0);
  84 }
  85
  86 /*******************************************************************
  87  Process command line options
  88  ******************************************************************/
  89
  90 static int process_options(int argc, char **argv, int local_flags)
  91 {
  92         int ch;
  93         const char *configfile = get_dyn_CONFIGFILE();
  94
  95         local_flags |= LOCAL_SET_PASSWORD;
  96
  97         ZERO_STRUCT(user_name);
  98
  99         user_name[0] = '\0';
 100
 101         while ((ch = getopt(argc, argv, "c:axdehminjr:sw:R:D:U:LWS:")) != EOF) {
 102                 switch(ch) {
 103                 case 'L':
 104                         if (getuid() != 0) {
 105                                 fprintf(stderr, "smbpasswd -L can only be used by root.\n");
 106                                 exit(1);
 107                         }
 108                         local_flags |= LOCAL_AM_ROOT;
 109                         break;
 110                 case 'c':
 111                         configfile = optarg;
 112                         set_dyn_CONFIGFILE(optarg);
 113                         break;
 114                 case 'a':
 115                         local_flags |= LOCAL_ADD_USER;
 116                         break;
 117                 case 'x':
 118                         local_flags |= LOCAL_DELETE_USER;
 119                         local_flags &= ~LOCAL_SET_PASSWORD;
 120                         break;
 121                 case 'd':
 122                         local_flags |= LOCAL_DISABLE_USER;
 123                         local_flags &= ~LOCAL_SET_PASSWORD;
 124                         break;
 125                 case 'e':
 126                         local_flags |= LOCAL_ENABLE_USER;
 127                         local_flags &= ~LOCAL_SET_PASSWORD;
 128                         break;
 129                 case 'm':
 130                         local_flags |= LOCAL_TRUST_ACCOUNT;
 131                         break;
 132                 case 'i':
 133                         local_flags |= LOCAL_INTERDOM_ACCOUNT;
 134                         break;
 135                 case 'j':
 136                         d_printf("See 'net join' for this functionality\n");
 137                         exit(1);
 138                         break;
 139                 case 'n':
 140                         local_flags |= LOCAL_SET_NO_PASSWORD;
 141                         local_flags &= ~LOCAL_SET_PASSWORD;
 142                         SAFE_FREE(new_passwd);
 143                         new_passwd = smb_xstrdup("NO PASSWORD");
 144                         break;
 145                 case 'r':
 146                         remote_machine = optarg;
 147                         break;
 148                 case 's':
 149                         set_line_buffering(stdin);
 150                         set_line_buffering(stdout);
 151                         set_line_buffering(stderr);
 152                         stdin_passwd_get = True;
 153                         break;
 154                 case 'w':
 155                         local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
 156                         fstrcpy(ldap_secret, optarg);
 157                         break;
 158                 case 'R':
 159                         lp_set_cmdline("name resolve order", optarg);
 160                         break;
 161                 case 'D':
 162                         lp_set_cmdline("log level", optarg);
 163                         break;
 164                 case 'U': {
 165                         got_username = True;
 166                         fstrcpy(user_name, optarg);
 167                         break;
 168                 case 'W':
 169                         local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
 170                         *ldap_secret = '\0';
 171                         break;
 172                 }
 173                 case 'h':
 174                 default:
 175                         usage();
 176                 }
 177         }
 178
 179         argc -= optind;
 180         argv += optind;
 181
 182         switch(argc) {
 183         case 0:
 184                 if (!got_username)
 185                         fstrcpy(user_name, "");
 186                 break;
 187         case 1:
 188                 if (!(local_flags & LOCAL_AM_ROOT)) {
 189                         usage();
 190                 } else {
 191                         if (got_username) {
 192                                 usage();
 193                         } else {
 194                                 fstrcpy(user_name, argv[0]);
 195                         }
 196                 }
 197                 break;
 198         default:
 199                 usage();
 200         }
 201
 202         if (!lp_load_global(configfile)) {
 203                 fprintf(stderr, "Can't load %s - run testparm to debug it\n",
 204                         configfile);
 205                 exit(1);
 206         }
 207
 208         return local_flags;
 209 }
 210
 211 /*************************************************************
 212  Utility function to prompt for new password.
 213 *************************************************************/
 214 static char *prompt_for_new_password(bool stdin_get)
 215 {
 216         char *p;
 217         fstring new_pw;
 218
 219         ZERO_ARRAY(new_pw);
 220
 221         p = get_pass("New SMB password:", stdin_get);
 222         if (p == NULL) {
 223                 return NULL;
 224         }
 225
 226         fstrcpy(new_pw, p);
 227         SAFE_FREE(p);
 228
 229         p = get_pass("Retype new SMB password:", stdin_get);
 230         if (p == NULL) {
 231                 return NULL;
 232         }
 233
 234         if (strcmp(p, new_pw)) {
 235                 fprintf(stderr, "Mismatch - password unchanged.\n");
 236                 ZERO_ARRAY(new_pw);
 237                 SAFE_FREE(p);
 238                 return NULL;
 239         }
 240
 241         return p;
 242 }
 243
 244
 245 /*************************************************************
 246  Change a password either locally or remotely.
 247 *************************************************************/
 248
 249 static NTSTATUS password_change(const char *remote_mach,
 250                                 const char *domain, const char *username,
 251                                 const char *old_passwd, const char *new_pw,
 252                                 int local_flags)
 253 {
 254         NTSTATUS ret;
 255         char *err_str = NULL;
 256         char *msg_str = NULL;
 257
 258         if (remote_mach != NULL) {
 259                 if (local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER|
 260                                    LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|
 261                                    LOCAL_TRUST_ACCOUNT|LOCAL_SET_NO_PASSWORD)) {
 262                         /* these things can't be done remotely yet */
 263                         fprintf(stderr, "Invalid remote operation!\n");
 264                         return NT_STATUS_UNSUCCESSFUL;
 265                 }
 266                 ret = remote_password_change(remote_mach,
 267                                              domain, username,
 268                                              old_passwd, new_pw, &err_str);
 269         } else {
 270                 ret = local_password_change(username, local_flags, new_pw,
 271                                             &err_str, &msg_str);
 272         }
 273
 274         if (msg_str) {
 275                 printf("%s", msg_str);
 276         }
 277         if (err_str) {
 278                 fprintf(stderr, "%s", err_str);
 279         }
 280         if (!NT_STATUS_IS_OK(ret) && !err_str) {
 281                 fprintf(stderr, "Failed to change password!\n");
 282         }
 283
 284         SAFE_FREE(msg_str);
 285         SAFE_FREE(err_str);
 286         return ret;
 287 }
 288
 289 /*******************************************************************
 290  Store the LDAP admin password in secrets.tdb
 291  ******************************************************************/
 292 static bool store_ldap_admin_pw (char* pw)
 293 {
 294         if (!pw)
 295                 return False;
 296
 297         if (!secrets_init())
 298                 return False;
 299
 300         return secrets_store_ldap_pw(lp_ldap_admin_dn(), pw);
 301 }
 302
 303
 304 /*************************************************************
 305  Handle password changing for root.
 306 *************************************************************/
 307
 308 static int process_root(int local_flags)
 309 {
 310         struct passwd  *pwd;
 311         int result = 0;
 312         char *old_passwd = NULL;
 313
 314         if (local_flags & LOCAL_SET_LDAP_ADMIN_PW) {
 315                 const char *ldap_admin_dn = lp_ldap_admin_dn();
 316                 if ( ! *ldap_admin_dn ) {
 317                         DEBUG(0,("ERROR: 'ldap admin dn' not defined! Please check your smb.conf\n"));
 318                         goto done;
 319                 }
 320
 321                 printf("Setting stored password for \"%s\" in secrets.tdb\n", ldap_admin_dn);
 322                 if ( ! *ldap_secret ) {
 323                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 324                         if (new_passwd == NULL) {
 325                                 fprintf(stderr, "Failed to read new password!\n");
 326                                 exit(1);
 327                         }
 328                         fstrcpy(ldap_secret, new_passwd);
 329                 }
 330                 if (!store_ldap_admin_pw(ldap_secret)) {
 331                         DEBUG(0,("ERROR: Failed to store the ldap admin password!\n"));
 332                 }
 333                 goto done;
 334         }
 335
 336         /* Ensure passdb startup(). */
 337         if(!initialize_password_db(False, NULL)) {
 338                 DEBUG(0, ("Failed to open passdb!\n"));
 339                 exit(1);
 340         }
 341
 342         /* Ensure we have a SAM sid. */
 343         get_global_sam_sid();
 344
 345         /*
 346          * Ensure both add/delete user are not set
 347          * Ensure add/delete user and either remote machine or join domain are
 348          * not both set.
 349          */
 350         if(((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) == (LOCAL_ADD_USER|LOCAL_DELETE_USER)) ||
 351            ((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) &&
 352                 (remote_machine != NULL))) {
 353                 usage();
 354         }
 355
 356         /* Only load interfaces if we are doing network operations. */
 357
 358         if (remote_machine) {
 359                 load_interfaces();
 360         }
 361
 362         if (!user_name[0] && (pwd = getpwuid_alloc(talloc_tos(), geteuid()))) {
 363                 fstrcpy(user_name, pwd->pw_name);
 364                 TALLOC_FREE(pwd);
 365         }
 366
 367         if (!user_name[0]) {
 368                 fprintf(stderr,"You must specify a username\n");
 369                 exit(1);
 370         }
 371
 372         if (local_flags & LOCAL_TRUST_ACCOUNT) {
 373                 /* add the $ automatically */
 374                 size_t user_name_len = strlen(user_name);
 375
 376                 if (user_name[user_name_len - 1] == '$') {
 377                         user_name_len--;
 378                 } else {
 379                         if (user_name_len + 2 > sizeof(user_name)) {
 380                                 fprintf(stderr, "machine name too long\n");
 381                                 exit(1);
 382                         }
 383                         user_name[user_name_len] = '$';
 384                         user_name[user_name_len + 1] = '\0';
 385                 }
 386
 387                 if (local_flags & LOCAL_ADD_USER) {
 388                         SAFE_FREE(new_passwd);
 389
 390                         /*
 391                          * Remove any trailing '$' before we
 392                          * generate the initial machine password.
 393                          */
 394                         new_passwd = smb_xstrndup(user_name, user_name_len);
 395                         if (!strlower_m(new_passwd)) {
 396                                 fprintf(stderr, "strlower_m %s failed\n",
 397                                         new_passwd);
 398                                 exit(1);
 399                         }
 400                 }
 401         } else if (local_flags & LOCAL_INTERDOM_ACCOUNT) {
 402                 size_t user_name_len = strlen(user_name);
 403
 404                 if (user_name[user_name_len - 1] != '$') {
 405                         if (user_name_len + 2 > sizeof(user_name)) {
 406                                 fprintf(stderr, "machine name too long\n");
 407                                 exit(1);
 408                         }
 409                         user_name[user_name_len] = '$';
 410                         user_name[user_name_len + 1] = '\0';
 411                 }
 412
 413                 if ((local_flags & LOCAL_ADD_USER) && (new_passwd == NULL)) {
 414                         /*
 415                          * Prompt for trusting domain's account password
 416                          */
 417                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 418                         if(!new_passwd) {
 419                                 fprintf(stderr, "Unable to get newpassword.\n");
 420                                 exit(1);
 421                         }
 422                 }
 423         } else {
 424
 425                 if (remote_machine != NULL) {
 426                         old_passwd = get_pass("Old SMB password:",stdin_passwd_get);
 427                         if(!old_passwd) {
 428                                 fprintf(stderr, "Unable to get old password.\n");
 429                                 exit(1);
 430                         }
 431                 }
 432
 433                 if (!(local_flags & LOCAL_SET_PASSWORD)) {
 434
 435                         /*
 436                          * If we are trying to enable a user, first we need to find out
 437                          * if they are using a modern version of the smbpasswd file that
 438                          * disables a user by just writing a flag into the file. If so
 439                          * then we can re-enable a user without prompting for a new
 440                          * password. If not (ie. they have a no stored password in the
 441                          * smbpasswd file) then we need to prompt for a new password.
 442                          */
 443
 444                         if(local_flags & LOCAL_ENABLE_USER) {
 445                                 struct samu *sampass = NULL;
 446
 447                                 sampass = samu_new( NULL );
 448                                 if (!sampass) {
 449                                         fprintf(stderr, "talloc fail for struct samu.\n");
 450                                         exit(1);
 451                                 }
 452                                 if (!pdb_getsampwnam(sampass, user_name)) {
 453                                         fprintf(stderr, "Failed to find user %s in passdb backend.\n",
 454                                                 user_name );
 455                                         exit(1);
 456                                 }
 457
 458                                 if(pdb_get_nt_passwd(sampass) == NULL) {
 459                                         local_flags |= LOCAL_SET_PASSWORD;
 460                                 }
 461                                 TALLOC_FREE(sampass);
 462                         }
 463                 }
 464
 465                 if((local_flags & LOCAL_SET_PASSWORD) && (new_passwd == NULL)) {
 466
 467                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 468                         if(!new_passwd) {
 469                                 fprintf(stderr, "Unable to get new password.\n");
 470                                 exit(1);
 471                         }
 472                 }
 473         }
 474
 475         if (!NT_STATUS_IS_OK(password_change(remote_machine,
 476                                              NULL, user_name,
 477                                              old_passwd, new_passwd,
 478                                              local_flags))) {
 479                 result = 1;
 480                 goto done;
 481         }
 482
 483         if(remote_machine) {
 484                 printf("Password changed for user %s on %s.\n", user_name, remote_machine );
 485         } else if(!(local_flags & (LOCAL_ADD_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|LOCAL_DELETE_USER|LOCAL_SET_NO_PASSWORD|LOCAL_SET_PASSWORD))) {
 486                 struct samu *sampass = NULL;
 487
 488                 sampass = samu_new( NULL );
 489                 if (!sampass) {
 490                         fprintf(stderr, "talloc fail for struct samu.\n");
 491                         exit(1);
 492                 }
 493
 494                 if (!pdb_getsampwnam(sampass, user_name)) {
 495                         fprintf(stderr, "Failed to find user %s in passdb backend.\n",
 496                                 user_name );
 497                         exit(1);
 498                 }
 499
 500                 printf("Password changed for user %s.", user_name );
 501                 if(pdb_get_acct_ctrl(sampass)&ACB_DISABLED) {
 502                         printf(" User has disabled flag set.");
 503                 }
 504                 if(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ) {
 505                         printf(" User has no password flag set.");
 506                 }
 507                 printf("\n");
 508                 TALLOC_FREE(sampass);
 509         }
 510
 511  done:
 512         SAFE_FREE(old_passwd);
 513         SAFE_FREE(new_passwd);
 514         return result;
 515 }
 516
 517
 518 /*************************************************************
 519  Handle password changing for non-root.
 520 *************************************************************/
 521
 522 static int process_nonroot(int local_flags)
 523 {
 524         struct passwd  *pwd = NULL;
 525         int result = 0;
 526         char *old_pw = NULL;
 527         char *new_pw = NULL;
 528         const char *username = user_name;
 529         const char *domain = NULL;
 530         char *p = NULL;
 531
 532         if (local_flags & ~(LOCAL_AM_ROOT | LOCAL_SET_PASSWORD)) {
 533                 /* Extra flags that we can't honor non-root */
 534                 usage();
 535         }
 536
 537         if (!user_name[0]) {
 538                 pwd = getpwuid_alloc(talloc_tos(), getuid());
 539                 if (pwd) {
 540                         fstrcpy(user_name,pwd->pw_name);
 541                         TALLOC_FREE(pwd);
 542                 } else {
 543                         fprintf(stderr, "smbpasswd: cannot lookup user name for uid %u\n", (unsigned int)getuid());
 544                         exit(1);
 545                 }
 546         }
 547
 548         /* Allow domain as part of the username */
 549         if ((p = strchr_m(user_name, '\\')) ||
 550             (p = strchr_m(user_name, '/')) ||
 551             (p = strchr_m(user_name, *lp_winbind_separator()))) {
 552                 *p = '\0';
 553                 username = p + 1;
 554                 domain = user_name;
 555         }
 556
 557         /*
 558          * A non-root user is always setting a password
 559          * via a remote machine (even if that machine is
 560          * localhost).
 561          */
 562
 563         load_interfaces(); /* Delayed from main() */
 564
 565         if (remote_machine != NULL) {
 566                 if (!is_ipaddress(remote_machine)) {
 567                         domain = remote_machine;
 568                 }
 569         } else {
 570                 remote_machine = "127.0.0.1";
 571
 572                 /*
 573                  * If we deal with a local user, change the password for the
 574                  * user in our SAM.
 575                  */
 576                 domain = get_global_sam_name();
 577         }
 578
 579         old_pw = get_pass("Old SMB password:",stdin_passwd_get);
 580         if (old_pw == NULL) {
 581                 fprintf(stderr, "Unable to get old password.\n");
 582                 exit(1);
 583         }
 584
 585         if (!new_passwd) {
 586                 new_pw = prompt_for_new_password(stdin_passwd_get);
 587         }
 588         else
 589                 new_pw = smb_xstrdup(new_passwd);
 590
 591         if (!new_pw) {
 592                 fprintf(stderr, "Unable to get new password.\n");
 593                 exit(1);
 594         }
 595
 596         if (!NT_STATUS_IS_OK(password_change(remote_machine,
 597                                              domain, username,
 598                                              old_pw, new_pw, 0))) {
 599                 result = 1;
 600                 goto done;
 601         }
 602
 603         printf("Password changed for user %s\n", username);
 604
 605  done:
 606         SAFE_FREE(old_pw);
 607         SAFE_FREE(new_pw);
 608
 609         return result;
 610 }
 611
 612
 613
 614 /*********************************************************
 615  Start here.
 616 **********************************************************/
 617 int main(int argc, char **argv)
 618 {
 619         TALLOC_CTX *frame = talloc_stackframe();
 620         int local_flags = 0;
 621         int ret;
 622
 623 #if defined(HAVE_SET_AUTH_PARAMETERS)
 624         set_auth_parameters(argc, argv);
 625 #endif /* HAVE_SET_AUTH_PARAMETERS */
 626
 627         if (getuid() == 0) {
 628                 local_flags = LOCAL_AM_ROOT;
 629         }
 630
 631         smb_init_locale();
 632
 633         local_flags = process_options(argc, argv, local_flags);
 634
 635         setup_logging("smbpasswd", DEBUG_STDERR);
 636
 637         /* Check the effective uid - make sure we are not setuid */
 638         if (is_setuid_root()) {
 639                 fprintf(stderr, "smbpasswd must *NOT* be setuid root.\n");
 640                 exit(1);
 641         }
 642
 643         if (local_flags & LOCAL_AM_ROOT) {
 644                 bool ok;
 645
 646                 ok = secrets_init();
 647                 if (!ok) {
 648                         return 1;
 649                 }
 650                 ret = process_root(local_flags);
 651         } else {
 652                 ret = process_nonroot(local_flags);
 653         }
 654         TALLOC_FREE(frame);
 655         return ret;
 656 }