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