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