contrib/pam_passwdqc/pam_passwdqc.c

   1 /*
   2  * Copyright (c) 2000-2003,2005 by Solar Designer.  See LICENSE.
   3  */
   4
   5 #if defined(__FreeBSD__) || defined(__DragonFly__)
   6 /* For vsnprintf(3) */
   7 #define _XOPEN_SOURCE 600
   8 #else
   9 #define _XOPEN_SOURCE 500
  10 #define _XOPEN_SOURCE_EXTENDED
  11 #define _XOPEN_VERSION 500
  12 #endif
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <stdarg.h>
  16 #include <string.h>
  17 #include <limits.h>
  18 #include <unistd.h>
  19 #include <pwd.h>
  20 #ifdef HAVE_SHADOW
  21 #include <shadow.h>
  22 #endif
  23
  24 #define PAM_SM_PASSWORD
  25 #ifndef LINUX_PAM
  26 #include <security/pam_appl.h>
  27 #endif
  28 #include <security/pam_modules.h>
  29
  30 #include "pam_macros.h"
  31
  32 #if !defined(PAM_EXTERN) && !defined(PAM_STATIC)
  33 #define PAM_EXTERN                      extern
  34 #endif
  35
  36 #if !defined(PAM_AUTHTOK_RECOVERY_ERR) && defined(PAM_AUTHTOK_RECOVER_ERR)
  37 #define PAM_AUTHTOK_RECOVERY_ERR        PAM_AUTHTOK_RECOVER_ERR
  38 #endif
  39
  40 #if (defined(__sun) || defined(__hpux)) && \
  41     !defined(LINUX_PAM) && !defined(_OPENPAM)
  42 /* Sun's PAM doesn't use const here, while Linux-PAM and OpenPAM do */
  43 #define lo_const
  44 #else
  45 #define lo_const                        const
  46 #endif
  47 #ifdef _OPENPAM
  48 /* OpenPAM doesn't use const here, while Linux-PAM does */
  49 #define l_const
  50 #else
  51 #define l_const                         lo_const
  52 #endif
  53 typedef lo_const void *pam_item_t;
  54
  55 #include "passwdqc.h"
  56
  57 #define F_ENFORCE_MASK                  0x00000003
  58 #define F_ENFORCE_USERS                 0x00000001
  59 #define F_ENFORCE_ROOT                  0x00000002
  60 #define F_ENFORCE_EVERYONE              F_ENFORCE_MASK
  61 #define F_NON_UNIX                      0x00000004
  62 #define F_ASK_OLDAUTHTOK_MASK           0x00000030
  63 #define F_ASK_OLDAUTHTOK_PRELIM         0x00000010
  64 #define F_ASK_OLDAUTHTOK_UPDATE         0x00000020
  65 #define F_CHECK_OLDAUTHTOK              0x00000040
  66 #define F_USE_FIRST_PASS                0x00000100
  67 #define F_USE_AUTHTOK                   0x00000200
  68
  69 typedef struct {
  70         passwdqc_params_t qc;
  71         int flags;
  72         int retry;
  73 } params_t;
  74
  75 static params_t defaults = {
  76         {
  77                 {INT_MAX, 24, 11, 8, 7},        /* min */
  78                 40,                             /* max */
  79                 3,                              /* passphrase_words */
  80                 4,                              /* match_length */
  81                 1,                              /* similar_deny */
  82                 42                              /* random_bits */
  83         },
  84         F_ENFORCE_EVERYONE,                     /* flags */
  85         3                                       /* retry */
  86 };
  87
  88 #define PROMPT_OLDPASS \
  89         "Enter current password: "
  90 #define PROMPT_NEWPASS1 \
  91         "Enter new password: "
  92 #define PROMPT_NEWPASS2 \
  93         "Re-type new password: "
  94
  95 #define MESSAGE_MISCONFIGURED \
  96         "System configuration error.  Please contact your administrator."
  97 #define MESSAGE_INVALID_OPTION \
  98         "pam_passwdqc: Invalid option: \"%s\"."
  99 #define MESSAGE_INTRO_PASSWORD \
 100         "\nYou can now choose the new password.\n"
 101 #define MESSAGE_INTRO_BOTH \
 102         "\nYou can now choose the new password or passphrase.\n"
 103 #define MESSAGE_EXPLAIN_PASSWORD_1CLASS \
 104         "A good password should be a mix of upper and lower case letters,\n" \
 105         "digits, and other characters.  You can use a%s %d character long\n" \
 106         "password.\n"
 107 #define MESSAGE_EXPLAIN_PASSWORD_CLASSES \
 108         "A valid password should be a mix of upper and lower case letters,\n" \
 109         "digits, and other characters.  You can use a%s %d character long\n" \
 110         "password with characters from at least %d of these 4 classes.\n" \
 111         "An upper case letter that begins the password and a digit that\n" \
 112         "ends it do not count towards the number of character classes used.\n"
 113 #define MESSAGE_EXPLAIN_PASSWORD_ALL_CLASSES \
 114         "A valid password should be a mix of upper and lower case letters,\n" \
 115         "digits, and other characters.  You can use a%s %d character long\n" \
 116         "password with characters from all of these classes.  An upper\n" \
 117         "case letter that begins the password and a digit that ends it do\n" \
 118         "not count towards the number of character classes used.\n"
 119 #define MESSAGE_EXPLAIN_PASSWORD_ALT \
 120         "A valid password should be a mix of upper and lower case letters,\n" \
 121         "digits, and other characters.  You can use a%s %d character long\n" \
 122         "password with characters from at least 3 of these 4 classes, or\n" \
 123         "a%s %d character long password containing characters from all the\n" \
 124         "classes.  An upper case letter that begins the password and a\n" \
 125         "digit that ends it do not count towards the number of character\n" \
 126         "classes used.\n"
 127 #define MESSAGE_EXPLAIN_PASSPHRASE \
 128         "A passphrase should be of at least %d words, %d to %d characters\n" \
 129         "long, and contain enough different characters.\n"
 130 #define MESSAGE_RANDOM \
 131         "Alternatively, if noone else can see your terminal now, you can\n" \
 132         "pick this as your password: \"%s\".\n"
 133 #define MESSAGE_RANDOMONLY \
 134         "This system is configured to permit randomly generated passwords\n" \
 135         "only.  If noone else can see your terminal now, you can pick this\n" \
 136         "as your password: \"%s\".  Otherwise, come back later.\n"
 137 #define MESSAGE_RANDOMFAILED \
 138         "This system is configured to use randomly generated passwords\n" \
 139         "only, but the attempt to generate a password has failed.  This\n" \
 140         "could happen for a number of reasons: you could have requested\n" \
 141         "an impossible password length, or the access to kernel random\n" \
 142         "number pool could have failed."
 143 #define MESSAGE_TOOLONG \
 144         "This password may be too long for some services.  Choose another."
 145 #define MESSAGE_TRUNCATED \
 146         "Warning: your longer password will be truncated to 8 characters."
 147 #define MESSAGE_WEAKPASS \
 148         "Weak password: %s."
 149 #define MESSAGE_NOTRANDOM \
 150         "Sorry, you've mistyped the password that was generated for you."
 151 #define MESSAGE_MISTYPED \
 152         "Sorry, passwords do not match."
 153 #define MESSAGE_RETRY \
 154         "Try again."
 155
 156 static int converse(pam_handle_t *pamh, int style, l_const char *text,
 157     struct pam_response **resp)
 158 {
 159         pam_item_t item;
 160         const struct pam_conv *conv;
 161         struct pam_message msg, *pmsg;
 162         int status;
 163
 164         *resp = NULL;
 165         status = pam_get_item(pamh, PAM_CONV, &item);
 166         if (status != PAM_SUCCESS)
 167                 return status;
 168         conv = item;
 169
 170         pmsg = &msg;
 171         msg.msg_style = style;
 172         msg.msg = (char *)text;
 173
 174         return conv->conv(1, (lo_const struct pam_message **)&pmsg, resp,
 175             conv->appdata_ptr);
 176 }
 177
 178 #ifdef __GNUC__
 179 __attribute__ ((format (printf, 3, 4)))
 180 #endif
 181 static int say(pam_handle_t *pamh, int style, const char *format, ...)
 182 {
 183         va_list args;
 184         char buffer[0x800];
 185         int needed;
 186         struct pam_response *resp;
 187         int status;
 188
 189         va_start(args, format);
 190         needed = vsnprintf(buffer, sizeof(buffer), format, args);
 191         va_end(args);
 192
 193         if ((unsigned int)needed < sizeof(buffer)) {
 194                 status = converse(pamh, style, buffer, &resp);
 195                 pwqc_overwrite_string(buffer);
 196                 pwqc_drop_pam_reply(resp, 1);
 197         } else {
 198                 status = PAM_ABORT;
 199                 memset(buffer, 0, sizeof(buffer));
 200         }
 201
 202         return status;
 203 }
 204
 205 static int check_max(params_t *params, pam_handle_t *pamh, const char *newpass)
 206 {
 207         if ((int)strlen(newpass) > params->qc.max) {
 208                 if (params->qc.max != 8) {
 209                         say(pamh, PAM_ERROR_MSG, MESSAGE_TOOLONG);
 210                         return -1;
 211                 }
 212                 say(pamh, PAM_TEXT_INFO, MESSAGE_TRUNCATED);
 213         }
 214
 215         return 0;
 216 }
 217
 218 static int check_pass(struct passwd *pw, const char *pass)
 219 {
 220 #ifdef HAVE_SHADOW
 221         struct spwd *spw;
 222         const char *hash;
 223         int retval;
 224
 225 #ifdef __hpux
 226         if (iscomsec()) {
 227 #else
 228         if (!strcmp(pw->pw_passwd, "x")) {
 229 #endif
 230                 spw = getspnam(pw->pw_name);
 231                 endspent();
 232                 if (!spw)
 233                         return -1;
 234 #ifdef __hpux
 235                 hash = bigcrypt(pass, spw->sp_pwdp);
 236 #else
 237                 hash = crypt(pass, spw->sp_pwdp);
 238 #endif
 239                 retval = strcmp(hash, spw->sp_pwdp) ? -1 : 0;
 240                 memset(spw->sp_pwdp, 0, strlen(spw->sp_pwdp));
 241                 return retval;
 242         }
 243 #endif
 244
 245         return strcmp(crypt(pass, pw->pw_passwd), pw->pw_passwd) ? -1 : 0;
 246 }
 247
 248 static int am_root(pam_handle_t *pamh)
 249 {
 250         pam_item_t item;
 251         const char *service;
 252
 253         if (getuid() != 0)
 254                 return 0;
 255
 256         if (pam_get_item(pamh, PAM_SERVICE, &item) != PAM_SUCCESS)
 257                 return 0;
 258         service = item;
 259
 260         return !strcmp(service, "passwd");
 261 }
 262
 263 static int parse(params_t *params, pam_handle_t *pamh,
 264     int argc, const char **argv)
 265 {
 266         const char *p;
 267         char *e;
 268         int i;
 269         unsigned long v;
 270
 271         while (argc) {
 272                 if (!strncmp(*argv, "min=", 4)) {
 273                         p = *argv + 4;
 274                         for (i = 0; i < 5; i++) {
 275                                 if (!strncmp(p, "disabled", 8)) {
 276                                         v = INT_MAX;
 277                                         p += 8;
 278                                 } else {
 279                                         v = strtoul(p, &e, 10);
 280                                         p = e;
 281                                 }
 282                                 if (i < 4 && *p++ != ',') break;
 283                                 if (v > INT_MAX) break;
 284                                 if (i && (int)v > params->qc.min[i - 1]) break;
 285                                 params->qc.min[i] = v;
 286                         }
 287                         if (*p) break;
 288                 } else
 289                 if (!strncmp(*argv, "max=", 4)) {
 290                         v = strtoul(*argv + 4, &e, 10);
 291                         if (*e || v < 8 || v > INT_MAX) break;
 292                         params->qc.max = v;
 293                 } else
 294                 if (!strncmp(*argv, "passphrase=", 11)) {
 295                         v = strtoul(*argv + 11, &e, 10);
 296                         if (*e || v > INT_MAX) break;
 297                         params->qc.passphrase_words = v;
 298                 } else
 299                 if (!strncmp(*argv, "match=", 6)) {
 300                         v = strtoul(*argv + 6, &e, 10);
 301                         if (*e || v > INT_MAX) break;
 302                         params->qc.match_length = v;
 303                 } else
 304                 if (!strncmp(*argv, "similar=", 8)) {
 305                         if (!strcmp(*argv + 8, "permit"))
 306                                 params->qc.similar_deny = 0;
 307                         else
 308                         if (!strcmp(*argv + 8, "deny"))
 309                                 params->qc.similar_deny = 1;
 310                         else
 311                                 break;
 312                 } else
 313                 if (!strncmp(*argv, "random=", 7)) {
 314                         v = strtoul(*argv + 7, &e, 10);
 315                         if (!strcmp(e, ",only")) {
 316                                 e += 5;
 317                                 params->qc.min[4] = INT_MAX;
 318                         }
 319                         if (*e || (v && v < 24) || v > 72) break;
 320                         params->qc.random_bits = v;
 321                 } else
 322                 if (!strncmp(*argv, "enforce=", 8)) {
 323                         params->flags &= ~F_ENFORCE_MASK;
 324                         if (!strcmp(*argv + 8, "users"))
 325                                 params->flags |= F_ENFORCE_USERS;
 326                         else
 327                         if (!strcmp(*argv + 8, "everyone"))
 328                                 params->flags |= F_ENFORCE_EVERYONE;
 329                         else
 330                         if (strcmp(*argv + 8, "none"))
 331                                 break;
 332                 } else
 333                 if (!strcmp(*argv, "non-unix")) {
 334                         if (params->flags & F_CHECK_OLDAUTHTOK) break;
 335                         params->flags |= F_NON_UNIX;
 336                 } else
 337                 if (!strncmp(*argv, "retry=", 6)) {
 338                         v = strtoul(*argv + 6, &e, 10);
 339                         if (*e || v > INT_MAX) break;
 340                         params->retry = v;
 341                 } else
 342                 if (!strncmp(*argv, "ask_oldauthtok", 14)) {
 343                         params->flags &= ~F_ASK_OLDAUTHTOK_MASK;
 344                         if (params->flags & F_USE_FIRST_PASS) break;
 345                         if (!strcmp(*argv + 14, "=update"))
 346                                 params->flags |= F_ASK_OLDAUTHTOK_UPDATE;
 347                         else
 348                         if (!(*argv)[14])
 349                                 params->flags |= F_ASK_OLDAUTHTOK_PRELIM;
 350                         else
 351                                 break;
 352                 } else
 353                 if (!strcmp(*argv, "check_oldauthtok")) {
 354                         if (params->flags & F_NON_UNIX) break;
 355                         params->flags |= F_CHECK_OLDAUTHTOK;
 356                 } else
 357                 if (!strcmp(*argv, "use_first_pass")) {
 358                         if (params->flags & F_ASK_OLDAUTHTOK_MASK) break;
 359                         params->flags |= F_USE_FIRST_PASS | F_USE_AUTHTOK;
 360                 } else
 361                 if (!strcmp(*argv, "use_authtok")) {
 362                         params->flags |= F_USE_AUTHTOK;
 363                 } else
 364                         break;
 365                 argc--; argv++;
 366         }
 367
 368         if (argc) {
 369                 say(pamh, PAM_ERROR_MSG, am_root(pamh) ?
 370                     MESSAGE_INVALID_OPTION : MESSAGE_MISCONFIGURED, *argv);
 371                 return PAM_ABORT;
 372         }
 373
 374         return PAM_SUCCESS;
 375 }
 376
 377 PAM_EXTERN int pam_sm_chauthtok(pam_handle_t *pamh, int flags,
 378     int argc, const char **argv)
 379 {
 380         params_t params;
 381         struct pam_response *resp;
 382         struct passwd *pw, fake_pw;
 383         pam_item_t item;
 384         const char *user, *oldpass, *newpass;
 385         char *trypass, *randompass;
 386         const char *reason;
 387         int ask_oldauthtok;
 388         int randomonly, enforce, retries_left, retry_wanted;
 389         int status;
 390
 391         params = defaults;
 392         status = parse(&params, pamh, argc, argv);
 393         if (status != PAM_SUCCESS)
 394                 return status;
 395
 396         ask_oldauthtok = 0;
 397         if (flags & PAM_PRELIM_CHECK) {
 398                 if (params.flags & F_ASK_OLDAUTHTOK_PRELIM)
 399                         ask_oldauthtok = 1;
 400         } else
 401         if (flags & PAM_UPDATE_AUTHTOK) {
 402                 if (params.flags & F_ASK_OLDAUTHTOK_UPDATE)
 403                         ask_oldauthtok = 1;
 404         } else
 405                 return PAM_SERVICE_ERR;
 406
 407         if (ask_oldauthtok && !am_root(pamh)) {
 408                 status = converse(pamh, PAM_PROMPT_ECHO_OFF,
 409                     PROMPT_OLDPASS, &resp);
 410
 411                 if (status == PAM_SUCCESS) {
 412                         if (resp && resp->resp) {
 413                                 status = pam_set_item(pamh,
 414                                     PAM_OLDAUTHTOK, resp->resp);
 415                                 pwqc_drop_pam_reply(resp, 1);
 416                         } else
 417                                 status = PAM_AUTHTOK_RECOVERY_ERR;
 418                 }
 419
 420                 if (status != PAM_SUCCESS)
 421                         return status;
 422         }
 423
 424         if (flags & PAM_PRELIM_CHECK)
 425                 return status;
 426
 427         status = pam_get_item(pamh, PAM_USER, &item);
 428         if (status != PAM_SUCCESS)
 429                 return status;
 430         user = item;
 431
 432         status = pam_get_item(pamh, PAM_OLDAUTHTOK, &item);
 433         if (status != PAM_SUCCESS)
 434                 return status;
 435         oldpass = item;
 436
 437         if (params.flags & F_NON_UNIX) {
 438                 pw = &fake_pw;
 439                 pw->pw_name = (char *)user;
 440                 pw->pw_gecos = "";
 441         } else {
 442                 pw = getpwnam(user);
 443                 endpwent();
 444                 if (!pw)
 445                         return PAM_USER_UNKNOWN;
 446                 if ((params.flags & F_CHECK_OLDAUTHTOK) && !am_root(pamh) &&
 447                     (!oldpass || check_pass(pw, oldpass)))
 448                         status = PAM_AUTH_ERR;
 449                 memset(pw->pw_passwd, 0, strlen(pw->pw_passwd));
 450                 if (status != PAM_SUCCESS)
 451                         return status;
 452         }
 453
 454         randomonly = params.qc.min[4] > params.qc.max;
 455
 456         if (am_root(pamh))
 457                 enforce = params.flags & F_ENFORCE_ROOT;
 458         else
 459                 enforce = params.flags & F_ENFORCE_USERS;
 460
 461         if (params.flags & F_USE_AUTHTOK) {
 462                 status = pam_get_item(pamh, PAM_AUTHTOK, &item);
 463                 if (status != PAM_SUCCESS)
 464                         return status;
 465                 newpass = item;
 466                 if (!newpass || (check_max(&params, pamh, newpass) && enforce))
 467                         return PAM_AUTHTOK_ERR;
 468                 reason = _passwdqc_check(&params.qc, newpass, oldpass, pw);
 469                 if (reason) {
 470                         say(pamh, PAM_ERROR_MSG, MESSAGE_WEAKPASS, reason);
 471                         if (enforce)
 472                                 status = PAM_AUTHTOK_ERR;
 473                 }
 474                 return status;
 475         }
 476
 477         retries_left = params.retry;
 478
 479 retry:
 480         retry_wanted = 0;
 481
 482         if (!randomonly &&
 483             params.qc.passphrase_words && params.qc.min[2] <= params.qc.max)
 484                 status = say(pamh, PAM_TEXT_INFO, MESSAGE_INTRO_BOTH);
 485         else
 486                 status = say(pamh, PAM_TEXT_INFO, MESSAGE_INTRO_PASSWORD);
 487         if (status != PAM_SUCCESS)
 488                 return status;
 489
 490         if (!randomonly && params.qc.min[0] == params.qc.min[4])
 491                 status = say(pamh, PAM_TEXT_INFO,
 492                     MESSAGE_EXPLAIN_PASSWORD_1CLASS,
 493                     params.qc.min[4] == 8 || params.qc.min[4] == 11 ? "n" : "",
 494                     params.qc.min[4]);
 495         else
 496         if (!randomonly && params.qc.min[3] == params.qc.min[4])
 497                 status = say(pamh, PAM_TEXT_INFO,
 498                     MESSAGE_EXPLAIN_PASSWORD_CLASSES,
 499                     params.qc.min[4] == 8 || params.qc.min[4] == 11 ? "n" : "",
 500                     params.qc.min[4],
 501                     params.qc.min[1] != params.qc.min[3] ? 3 : 2);
 502         else
 503         if (!randomonly && params.qc.min[3] == INT_MAX)
 504                 status = say(pamh, PAM_TEXT_INFO,
 505                     MESSAGE_EXPLAIN_PASSWORD_ALL_CLASSES,
 506                     params.qc.min[4] == 8 || params.qc.min[4] == 11 ? "n" : "",
 507                     params.qc.min[4]);
 508         else
 509         if (!randomonly)
 510                 status = say(pamh, PAM_TEXT_INFO,
 511                     MESSAGE_EXPLAIN_PASSWORD_ALT,
 512                     params.qc.min[3] == 8 || params.qc.min[3] == 11 ? "n" : "",
 513                     params.qc.min[3],
 514                     params.qc.min[4] == 8 || params.qc.min[4] == 11 ? "n" : "",
 515                     params.qc.min[4]);
 516         if (status != PAM_SUCCESS)
 517                 return status;
 518
 519         if (!randomonly &&
 520             params.qc.passphrase_words &&
 521             params.qc.min[2] <= params.qc.max) {
 522                 status = say(pamh, PAM_TEXT_INFO, MESSAGE_EXPLAIN_PASSPHRASE,
 523                     params.qc.passphrase_words,
 524                     params.qc.min[2], params.qc.max);
 525                 if (status != PAM_SUCCESS)
 526                         return status;
 527         }
 528
 529         randompass = _passwdqc_random(&params.qc);
 530         if (randompass) {
 531                 status = say(pamh, PAM_TEXT_INFO, randomonly ?
 532                     MESSAGE_RANDOMONLY : MESSAGE_RANDOM, randompass);
 533                 if (status != PAM_SUCCESS) {
 534                         pwqc_overwrite_string(randompass);
 535                         randompass = NULL;
 536                 }
 537         } else
 538         if (randomonly) {
 539                 say(pamh, PAM_ERROR_MSG, am_root(pamh) ?
 540                     MESSAGE_RANDOMFAILED : MESSAGE_MISCONFIGURED);
 541                 return PAM_AUTHTOK_ERR;
 542         }
 543
 544         status = converse(pamh, PAM_PROMPT_ECHO_OFF, PROMPT_NEWPASS1, &resp);
 545         if (status == PAM_SUCCESS && (!resp || !resp->resp))
 546                 status = PAM_AUTHTOK_ERR;
 547
 548         if (status != PAM_SUCCESS) {
 549                 pwqc_overwrite_string(randompass);
 550                 return status;
 551         }
 552
 553         trypass = strdup(resp->resp);
 554
 555         pwqc_drop_pam_reply(resp, 1);
 556
 557         if (!trypass) {
 558                 pwqc_overwrite_string(randompass);
 559                 return PAM_AUTHTOK_ERR;
 560         }
 561
 562         if (check_max(&params, pamh, trypass) && enforce) {
 563                 status = PAM_AUTHTOK_ERR;
 564                 retry_wanted = 1;
 565         }
 566
 567         reason = NULL;
 568         if (status == PAM_SUCCESS &&
 569             (!randompass || !strstr(trypass, randompass)) &&
 570             (randomonly ||
 571             (reason = _passwdqc_check(&params.qc, trypass, oldpass, pw)))) {
 572                 if (randomonly)
 573                         say(pamh, PAM_ERROR_MSG, MESSAGE_NOTRANDOM);
 574                 else
 575                         say(pamh, PAM_ERROR_MSG, MESSAGE_WEAKPASS, reason);
 576                 if (enforce) {
 577                         status = PAM_AUTHTOK_ERR;
 578                         retry_wanted = 1;
 579                 }
 580         }
 581
 582         if (status == PAM_SUCCESS)
 583                 status = converse(pamh, PAM_PROMPT_ECHO_OFF,
 584                     PROMPT_NEWPASS2, &resp);
 585         if (status == PAM_SUCCESS) {
 586                 if (resp && resp->resp) {
 587                         if (strcmp(trypass, resp->resp)) {
 588                                 status = say(pamh,
 589                                     PAM_ERROR_MSG, MESSAGE_MISTYPED);
 590                                 if (status == PAM_SUCCESS) {
 591                                         status = PAM_AUTHTOK_ERR;
 592                                         retry_wanted = 1;
 593                                 }
 594                         }
 595                         pwqc_drop_pam_reply(resp, 1);
 596                 } else
 597                         status = PAM_AUTHTOK_ERR;
 598         }
 599
 600         if (status == PAM_SUCCESS)
 601                 status = pam_set_item(pamh, PAM_AUTHTOK, trypass);
 602
 603         pwqc_overwrite_string(randompass);
 604         pwqc_overwrite_string(trypass);
 605         pwqc_drop_mem(trypass);
 606
 607         if (retry_wanted && --retries_left > 0) {
 608                 status = say(pamh, PAM_TEXT_INFO, MESSAGE_RETRY);
 609                 if (status == PAM_SUCCESS)
 610                         goto retry;
 611         }
 612
 613         return status;
 614 }
 615
 616 #ifdef PAM_MODULE_ENTRY
 617 PAM_MODULE_ENTRY("pam_passwdqc");
 618 #elif defined(PAM_STATIC)
 619 struct pam_module _pam_passwdqc_modstruct = {
 620         "pam_passwdqc",
 621         NULL,
 622         NULL,
 623         NULL,
 624         NULL,
 625         NULL,
 626         pam_sm_chauthtok
 627 };
 628 #endif