apps/passwd.c

   1 /*
   2  * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #if defined OPENSSL_NO_MD5 || defined CHARSET_EBCDIC
  11 # define NO_MD5CRYPT_1
  12 #endif
  13
  14 #if defined OPENSSL_NO_SHA || defined CHARSET_EBCDIC
  15 # define NO_SHACRYPT
  16 #endif
  17
  18 #if !defined(OPENSSL_NO_DES) || !defined(NO_MD5CRYPT_1) || !defined(NO_SHACRYPT)
  19
  20 # include <string.h>
  21
  22 # include "apps.h"
  23
  24 # include <openssl/bio.h>
  25 # include <openssl/err.h>
  26 # include <openssl/evp.h>
  27 # include <openssl/rand.h>
  28 # ifndef OPENSSL_NO_DES
  29 #  include <openssl/des.h>
  30 # endif
  31 # ifndef NO_MD5CRYPT_1
  32 #  include <openssl/md5.h>
  33 # endif
  34 # ifndef NO_SHACRYPT
  35 #  include <openssl/sha.h>
  36 # endif
  37
  38 static unsigned const char cov_2char[64] = {
  39     /* from crypto/des/fcrypt.c */
  40     0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
  41     0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44,
  42     0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C,
  43     0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54,
  44     0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62,
  45     0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
  46     0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72,
  47     0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
  48 };
  49
  50 typedef enum {
  51     passwd_unset = 0,
  52     passwd_crypt,
  53     passwd_md5,
  54     passwd_apr1,
  55     passwd_sha256,
  56     passwd_sha512
  57 } passwd_modes;
  58
  59 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
  60                      char *passwd, BIO *out, int quiet, int table,
  61                      int reverse, size_t pw_maxlen, passwd_modes mode);
  62
  63 typedef enum OPTION_choice {
  64     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  65     OPT_IN,
  66     OPT_NOVERIFY, OPT_QUIET, OPT_TABLE, OPT_REVERSE, OPT_APR1,
  67     OPT_1, OPT_5, OPT_6, OPT_CRYPT, OPT_SALT, OPT_STDIN
  68 } OPTION_CHOICE;
  69
  70 OPTIONS passwd_options[] = {
  71     {"help", OPT_HELP, '-', "Display this summary"},
  72     {"in", OPT_IN, '<', "Pead passwords from file"},
  73     {"noverify", OPT_NOVERIFY, '-',
  74      "Never verify when reading password from terminal"},
  75     {"quiet", OPT_QUIET, '-', "No warnings"},
  76     {"table", OPT_TABLE, '-', "Format output as table"},
  77     {"reverse", OPT_REVERSE, '-', "Switch table columns"},
  78     {"salt", OPT_SALT, 's', "Use provided salt"},
  79     {"stdin", OPT_STDIN, '-', "Read passwords from stdin"},
  80 # ifndef NO_SHACRYPT
  81     {"6", OPT_6, '-', "SHA512-based password algorithm"},
  82     {"5", OPT_5, '-', "SHA256-based password algorithm"},
  83 # endif
  84 # ifndef NO_MD5CRYPT_1
  85     {"apr1", OPT_APR1, '-', "MD5-based password algorithm, Apache variant"},
  86     {"1", OPT_1, '-', "MD5-based password algorithm"},
  87 # endif
  88 # ifndef OPENSSL_NO_DES
  89     {"crypt", OPT_CRYPT, '-', "Standard Unix password algorithm (default)"},
  90 # endif
  91     {NULL}
  92 };
  93
  94 int passwd_main(int argc, char **argv)
  95 {
  96     BIO *in = NULL;
  97     char *infile = NULL, *salt = NULL, *passwd = NULL, **passwds = NULL;
  98     char *salt_malloc = NULL, *passwd_malloc = NULL, *prog;
  99     OPTION_CHOICE o;
 100     int in_stdin = 0, pw_source_defined = 0;
 101 #ifndef OPENSSL_NO_UI
 102     int in_noverify = 0;
 103 #endif
 104     int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
 105     int ret = 1;
 106     passwd_modes mode = passwd_unset;
 107     size_t passwd_malloc_size = 0;
 108     size_t pw_maxlen = 256; /* arbitrary limit, should be enough for most
 109                              * passwords */
 110
 111     prog = opt_init(argc, argv, passwd_options);
 112     while ((o = opt_next()) != OPT_EOF) {
 113         switch (o) {
 114         case OPT_EOF:
 115         case OPT_ERR:
 116  opthelp:
 117             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 118             goto end;
 119         case OPT_HELP:
 120             opt_help(passwd_options);
 121             ret = 0;
 122             goto end;
 123         case OPT_IN:
 124             if (pw_source_defined)
 125                 goto opthelp;
 126             infile = opt_arg();
 127             pw_source_defined = 1;
 128             break;
 129         case OPT_NOVERIFY:
 130 #ifndef OPENSSL_NO_UI
 131             in_noverify = 1;
 132 #endif
 133             break;
 134         case OPT_QUIET:
 135             quiet = 1;
 136             break;
 137         case OPT_TABLE:
 138             table = 1;
 139             break;
 140         case OPT_REVERSE:
 141             reverse = 1;
 142             break;
 143         case OPT_1:
 144             if (mode != passwd_unset)
 145                 goto opthelp;
 146             mode = passwd_md5;
 147             break;
 148         case OPT_5:
 149             if (mode != passwd_unset)
 150                 goto opthelp;
 151             mode = passwd_sha256;
 152             break;
 153         case OPT_6:
 154             if (mode != passwd_unset)
 155                 goto opthelp;
 156             mode = passwd_sha512;
 157             break;
 158         case OPT_APR1:
 159             if (mode != passwd_unset)
 160                 goto opthelp;
 161             mode = passwd_apr1;
 162             break;
 163         case OPT_CRYPT:
 164             if (mode != passwd_unset)
 165                 goto opthelp;
 166             mode = passwd_crypt;
 167             break;
 168         case OPT_SALT:
 169             passed_salt = 1;
 170             salt = opt_arg();
 171             break;
 172         case OPT_STDIN:
 173             if (pw_source_defined)
 174                 goto opthelp;
 175             in_stdin = 1;
 176             pw_source_defined = 1;
 177             break;
 178         }
 179     }
 180     argc = opt_num_rest();
 181     argv = opt_rest();
 182
 183     if (*argv) {
 184         if (pw_source_defined)
 185             goto opthelp;
 186         pw_source_defined = 1;
 187         passwds = argv;
 188     }
 189
 190     if (mode == passwd_unset) {
 191         /* use default */
 192         mode = passwd_crypt;
 193     }
 194
 195 # ifdef OPENSSL_NO_DES
 196     if (mode == passwd_crypt)
 197         goto opthelp;
 198 # endif
 199 # ifdef NO_MD5CRYPT_1
 200     if (mode == passwd_md5 || mode == passwd_apr1)
 201         goto opthelp;
 202 # endif
 203 # ifdef NO_SHACRYPT
 204     if (mode == passwd_sha256 || mode == passwd_sha512)
 205         goto opthelp;
 206 # endif
 207
 208     if (infile != NULL && in_stdin) {
 209         BIO_printf(bio_err, "%s: Can't combine -in and -stdin\n", prog);
 210         goto end;
 211     }
 212
 213     if (infile != NULL || in_stdin) {
 214         /*
 215          * If in_stdin is true, we know that infile is NULL, and that
 216          * bio_open_default() will give us back an alias for stdin.
 217          */
 218         in = bio_open_default(infile, 'r', FORMAT_TEXT);
 219         if (in == NULL)
 220             goto end;
 221     }
 222
 223     if (mode == passwd_crypt)
 224         pw_maxlen = 8;
 225
 226     if (passwds == NULL) {
 227         /* no passwords on the command line */
 228
 229         passwd_malloc_size = pw_maxlen + 2;
 230         /* longer than necessary so that we can warn about truncation */
 231         passwd = passwd_malloc =
 232             app_malloc(passwd_malloc_size, "password buffer");
 233     }
 234
 235     if ((in == NULL) && (passwds == NULL)) {
 236         if (1) {
 237 #ifndef OPENSSL_NO_UI
 238             /* build a null-terminated list */
 239             static char *passwds_static[2] = { NULL, NULL };
 240
 241             passwds = passwds_static;
 242             if (in == NULL)
 243                 if (EVP_read_pw_string
 244                     (passwd_malloc, passwd_malloc_size, "Password: ",
 245                      !(passed_salt || in_noverify)) != 0)
 246                     goto end;
 247             passwds[0] = passwd_malloc;
 248         } else {
 249 #endif
 250             BIO_printf(bio_err, "password required\n");
 251             goto end;
 252         }
 253     }
 254
 255
 256     if (in == NULL) {
 257         assert(passwds != NULL);
 258         assert(*passwds != NULL);
 259
 260         do {                    /* loop over list of passwords */
 261             passwd = *passwds++;
 262             if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, bio_out,
 263                            quiet, table, reverse, pw_maxlen, mode))
 264                 goto end;
 265         }
 266         while (*passwds != NULL);
 267     } else
 268         /* in != NULL */
 269     {
 270         int done;
 271
 272         assert(passwd != NULL);
 273         do {
 274             int r = BIO_gets(in, passwd, pw_maxlen + 1);
 275             if (r > 0) {
 276                 char *c = (strchr(passwd, '\n'));
 277                 if (c != NULL)
 278                     *c = 0;     /* truncate at newline */
 279                 else {
 280                     /* ignore rest of line */
 281                     char trash[BUFSIZ];
 282                     do
 283                         r = BIO_gets(in, trash, sizeof trash);
 284                     while ((r > 0) && (!strchr(trash, '\n')));
 285                 }
 286
 287                 if (!do_passwd
 288                     (passed_salt, &salt, &salt_malloc, passwd, bio_out, quiet,
 289                      table, reverse, pw_maxlen, mode))
 290                     goto end;
 291             }
 292             done = (r <= 0);
 293         }
 294         while (!done);
 295     }
 296     ret = 0;
 297
 298  end:
 299     ERR_print_errors(bio_err);
 300     OPENSSL_free(salt_malloc);
 301     OPENSSL_free(passwd_malloc);
 302     BIO_free(in);
 303     return (ret);
 304 }
 305
 306 # ifndef NO_MD5CRYPT_1
 307 /*
 308  * MD5-based password algorithm (should probably be available as a library
 309  * function; then the static buffer would not be acceptable). For magic
 310  * string "1", this should be compatible to the MD5-based BSD password
 311  * algorithm. For 'magic' string "apr1", this is compatible to the MD5-based
 312  * Apache password algorithm. (Apparently, the Apache password algorithm is
 313  * identical except that the 'magic' string was changed -- the laziest
 314  * application of the NIH principle I've ever encountered.)
 315  */
 316 static char *md5crypt(const char *passwd, const char *magic, const char *salt)
 317 {
 318     /* "$apr1$..salt..$.......md5hash..........\0" */
 319     static char out_buf[6 + 9 + 24 + 2];
 320     unsigned char buf[MD5_DIGEST_LENGTH];
 321     char *salt_out;
 322     int n;
 323     unsigned int i;
 324     EVP_MD_CTX *md = NULL, *md2 = NULL;
 325     size_t passwd_len, salt_len, magic_len;
 326
 327     passwd_len = strlen(passwd);
 328     out_buf[0] = '$';
 329     out_buf[1] = 0;
 330     magic_len = strlen(magic);
 331
 332     if (magic_len > 4)    /* assert it's  "1" or "apr1" */
 333         return NULL;
 334
 335     OPENSSL_strlcat(out_buf, magic, sizeof out_buf);
 336     OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 337     OPENSSL_strlcat(out_buf, salt, sizeof out_buf);
 338
 339     if (strlen(out_buf) > 6 + 8) /* assert "$apr1$..salt.." */
 340         return NULL;
 341
 342     salt_out = out_buf + 2 + magic_len;
 343     salt_len = strlen(salt_out);
 344
 345     if (salt_len > 8)
 346         return NULL;
 347
 348     md = EVP_MD_CTX_new();
 349     if (md == NULL
 350         || !EVP_DigestInit_ex(md, EVP_md5(), NULL)
 351         || !EVP_DigestUpdate(md, passwd, passwd_len)
 352         || !EVP_DigestUpdate(md, "$", 1)
 353         || !EVP_DigestUpdate(md, magic, magic_len)
 354         || !EVP_DigestUpdate(md, "$", 1)
 355         || !EVP_DigestUpdate(md, salt_out, salt_len))
 356         goto err;
 357
 358     md2 = EVP_MD_CTX_new();
 359     if (md2 == NULL
 360         || !EVP_DigestInit_ex(md2, EVP_md5(), NULL)
 361         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 362         || !EVP_DigestUpdate(md2, salt_out, salt_len)
 363         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 364         || !EVP_DigestFinal_ex(md2, buf, NULL))
 365         goto err;
 366
 367     for (i = passwd_len; i > sizeof buf; i -= sizeof buf) {
 368         if (!EVP_DigestUpdate(md, buf, sizeof buf))
 369             goto err;
 370     }
 371     if (!EVP_DigestUpdate(md, buf, i))
 372         goto err;
 373
 374     n = passwd_len;
 375     while (n) {
 376         if (!EVP_DigestUpdate(md, (n & 1) ? "\0" : passwd, 1))
 377             goto err;
 378         n >>= 1;
 379     }
 380     if (!EVP_DigestFinal_ex(md, buf, NULL))
 381         return NULL;
 382
 383     for (i = 0; i < 1000; i++) {
 384         if (!EVP_DigestInit_ex(md2, EVP_md5(), NULL))
 385             goto err;
 386         if (!EVP_DigestUpdate(md2,
 387                               (i & 1) ? (unsigned const char *)passwd : buf,
 388                               (i & 1) ? passwd_len : sizeof buf))
 389             goto err;
 390         if (i % 3) {
 391             if (!EVP_DigestUpdate(md2, salt_out, salt_len))
 392                 goto err;
 393         }
 394         if (i % 7) {
 395             if (!EVP_DigestUpdate(md2, passwd, passwd_len))
 396                 goto err;
 397         }
 398         if (!EVP_DigestUpdate(md2,
 399                               (i & 1) ? buf : (unsigned const char *)passwd,
 400                               (i & 1) ? sizeof buf : passwd_len))
 401                 goto err;
 402         if (!EVP_DigestFinal_ex(md2, buf, NULL))
 403                 goto err;
 404     }
 405     EVP_MD_CTX_free(md2);
 406     EVP_MD_CTX_free(md);
 407     md2 = NULL;
 408     md = NULL;
 409
 410     {
 411         /* transform buf into output string */
 412         unsigned char buf_perm[sizeof buf];
 413         int dest, source;
 414         char *output;
 415
 416         /* silly output permutation */
 417         for (dest = 0, source = 0; dest < 14;
 418              dest++, source = (source + 6) % 17)
 419             buf_perm[dest] = buf[source];
 420         buf_perm[14] = buf[5];
 421         buf_perm[15] = buf[11];
 422 #  ifndef PEDANTIC              /* Unfortunately, this generates a "no
 423                                  * effect" warning */
 424         assert(16 == sizeof buf_perm);
 425 #  endif
 426
 427         output = salt_out + salt_len;
 428         assert(output == out_buf + strlen(out_buf));
 429
 430         *output++ = '$';
 431
 432         for (i = 0; i < 15; i += 3) {
 433             *output++ = cov_2char[buf_perm[i + 2] & 0x3f];
 434             *output++ = cov_2char[((buf_perm[i + 1] & 0xf) << 2) |
 435                                   (buf_perm[i + 2] >> 6)];
 436             *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
 437                                   (buf_perm[i + 1] >> 4)];
 438             *output++ = cov_2char[buf_perm[i] >> 2];
 439         }
 440         assert(i == 15);
 441         *output++ = cov_2char[buf_perm[i] & 0x3f];
 442         *output++ = cov_2char[buf_perm[i] >> 6];
 443         *output = 0;
 444         assert(strlen(out_buf) < sizeof(out_buf));
 445     }
 446
 447     return out_buf;
 448
 449  err:
 450     EVP_MD_CTX_free(md2);
 451     EVP_MD_CTX_free(md);
 452     return NULL;
 453 }
 454 # endif
 455
 456 # ifndef NO_SHACRYPT
 457 /*
 458  * SHA based password algorithm, describe by Ulrich Drepper here:
 459  * https://www.akkadia.org/drepper/SHA-crypt.txt
 460  * (note that it's in the public domain)
 461  */
 462 static char *shacrypt(const char *passwd, const char *magic, const char *salt)
 463 {
 464     /* Prefix for optional rounds specification.  */
 465     static const char rounds_prefix[] = "rounds=";
 466     /* Maximum salt string length.  */
 467 #define SALT_LEN_MAX 16
 468     /* Default number of rounds if not explicitly specified.  */
 469 #define ROUNDS_DEFAULT 5000
 470     /* Minimum number of rounds.  */
 471 #define ROUNDS_MIN 1000
 472     /* Maximum number of rounds.  */
 473 #define ROUNDS_MAX 999999999
 474
 475     /* "$6$rounds=<N>$......salt......$...shahash(up to 86 chars)...\0" */
 476     static char out_buf[3 + 17 + 17 + 86 + 1];
 477     unsigned char buf[SHA512_DIGEST_LENGTH];
 478     unsigned char temp_buf[SHA512_DIGEST_LENGTH];
 479     size_t buf_size = 0;
 480     char salt_copy[17];          /* Max 16 chars plus '\0' */
 481     size_t n;
 482     EVP_MD_CTX *md = NULL, *md2 = NULL;
 483     const EVP_MD *sha = NULL;
 484     size_t passwd_len, salt_len, magic_len;
 485     size_t rounds = 5000;        /* Default */
 486     char rounds_custom = 0;
 487     char *p_bytes = NULL;
 488     char *s_bytes = NULL;
 489     char *cp = NULL;
 490
 491     passwd_len = strlen(passwd);
 492     magic_len = strlen(magic);
 493
 494     /* assert it's "5" or "6" */
 495     if (magic_len != 1)
 496         return NULL;
 497
 498     switch (magic[0]) {
 499     case '5':
 500         sha = EVP_sha256();
 501         buf_size = 32;
 502         break;
 503     case '6':
 504         sha = EVP_sha512();
 505         buf_size = 64;
 506         break;
 507     default:
 508         return NULL;
 509     }
 510
 511     if (strncmp(salt, rounds_prefix, sizeof(rounds_prefix) - 1) == 0) {
 512         const char *num = salt + sizeof(rounds_prefix) - 1;
 513         char *endp;
 514         unsigned long int srounds = strtoul (num, &endp, 10);
 515         if (*endp == '$') {
 516             salt = endp + 1;
 517             if (srounds > ROUNDS_MAX)
 518                 rounds = ROUNDS_MAX;
 519             else if (srounds < ROUNDS_MIN)
 520                 rounds = ROUNDS_MIN;
 521             else
 522                 rounds = srounds;
 523             rounds_custom = 1;
 524         } else {
 525             return NULL;
 526         }
 527     }
 528
 529     /* The salt gets truncated to 16 chars */
 530     OPENSSL_strlcpy(salt_copy, salt, sizeof salt_copy);
 531     salt_len = strlen(salt_copy);
 532
 533     out_buf[0] = 0;
 534     OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 535     OPENSSL_strlcat(out_buf, magic, sizeof out_buf);
 536     OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 537     if (rounds_custom) {
 538         char tmp_buf[7 + 9 + 1]; /* "rounds=999999999" */
 539         sprintf(tmp_buf, "rounds=%lu", rounds);
 540         OPENSSL_strlcat(out_buf, tmp_buf, sizeof out_buf);
 541         OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 542     }
 543     OPENSSL_strlcat(out_buf, salt_copy, sizeof out_buf);
 544
 545     /* assert "$5$rounds=999999999$......salt......" */
 546     if (strlen(out_buf) > 3 + 17 * rounds_custom + salt_len )
 547         return NULL;
 548
 549     md = EVP_MD_CTX_new();
 550     if (md == NULL
 551         || !EVP_DigestInit_ex(md, sha, NULL)
 552         || !EVP_DigestUpdate(md, passwd, passwd_len)
 553         || !EVP_DigestUpdate(md, salt_copy, salt_len))
 554         goto err;
 555
 556     md2 = EVP_MD_CTX_new();
 557     if (md2 == NULL
 558         || !EVP_DigestInit_ex(md2, sha, NULL)
 559         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 560         || !EVP_DigestUpdate(md2, salt_copy, salt_len)
 561         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 562         || !EVP_DigestFinal_ex(md2, buf, NULL))
 563         goto err;
 564
 565     for (n = passwd_len; n > buf_size; n -= buf_size) {
 566         if (!EVP_DigestUpdate(md, buf, buf_size))
 567             goto err;
 568     }
 569     if (!EVP_DigestUpdate(md, buf, n))
 570         goto err;
 571
 572     n = passwd_len;
 573     while (n) {
 574         if (!EVP_DigestUpdate(md,
 575                               (n & 1) ? buf : (unsigned const char *)passwd,
 576                               (n & 1) ? buf_size : passwd_len))
 577             goto err;
 578         n >>= 1;
 579     }
 580     if (!EVP_DigestFinal_ex(md, buf, NULL))
 581         return NULL;
 582
 583     /* P sequence */
 584     if (!EVP_DigestInit_ex(md2, sha, NULL))
 585         goto err;
 586
 587     for (n = passwd_len; n > 0; n--)
 588         if (!EVP_DigestUpdate(md2, passwd, passwd_len))
 589             goto err;
 590
 591     if (!EVP_DigestFinal_ex(md2, temp_buf, NULL))
 592         return NULL;
 593
 594     if ((p_bytes = OPENSSL_zalloc(passwd_len)) == NULL)
 595         goto err;
 596     for (cp = p_bytes, n = passwd_len; n > buf_size; n -= buf_size, cp += buf_size)
 597         memcpy(cp, temp_buf, buf_size);
 598     memcpy(cp, temp_buf, n);
 599
 600     /* S sequence */
 601     if (!EVP_DigestInit_ex(md2, sha, NULL))
 602         goto err;
 603
 604     for (n = 16 + buf[0]; n > 0; n--)
 605         if (!EVP_DigestUpdate(md2, salt, salt_len))
 606             goto err;
 607
 608     if (!EVP_DigestFinal_ex(md2, temp_buf, NULL))
 609         return NULL;
 610
 611     if ((s_bytes = OPENSSL_zalloc(salt_len)) == NULL)
 612         goto err;
 613     for (cp = s_bytes, n = salt_len; n > buf_size; n -= buf_size, cp += buf_size)
 614         memcpy(cp, temp_buf, buf_size);
 615     memcpy(cp, temp_buf, n);
 616
 617     for (n = 0; n < rounds; n++) {
 618         if (!EVP_DigestInit_ex(md2, sha, NULL))
 619             goto err;
 620         if (!EVP_DigestUpdate(md2,
 621                               (n & 1) ? (unsigned const char *)p_bytes : buf,
 622                               (n & 1) ? passwd_len : buf_size))
 623             goto err;
 624         if (n % 3) {
 625             if (!EVP_DigestUpdate(md2, s_bytes, salt_len))
 626                 goto err;
 627         }
 628         if (n % 7) {
 629             if (!EVP_DigestUpdate(md2, p_bytes, passwd_len))
 630                 goto err;
 631         }
 632         if (!EVP_DigestUpdate(md2,
 633                               (n & 1) ? buf : (unsigned const char *)p_bytes,
 634                               (n & 1) ? buf_size : passwd_len))
 635                 goto err;
 636         if (!EVP_DigestFinal_ex(md2, buf, NULL))
 637                 goto err;
 638     }
 639     EVP_MD_CTX_free(md2);
 640     EVP_MD_CTX_free(md);
 641     md2 = NULL;
 642     md = NULL;
 643     OPENSSL_free(p_bytes);
 644     OPENSSL_free(s_bytes);
 645     p_bytes = NULL;
 646     s_bytes = NULL;
 647
 648     cp = out_buf + strlen(out_buf);
 649     *cp++ = '$';
 650
 651 #define b64_from_24bit(B2, B1, B0, N)                                   \
 652     do {                                                                \
 653         unsigned int w = ((B2) << 16) | ((B1) << 8) | (B0);             \
 654         int i = (N);                                                    \
 655         while (i-- > 0)                                                 \
 656             {                                                           \
 657                 *cp++ = cov_2char[w & 0x3f];                            \
 658                 w >>= 6;                                                \
 659             }                                                           \
 660     } while (0)
 661
 662     switch (*magic) {
 663     case '5':
 664         b64_from_24bit (buf[0], buf[10], buf[20], 4);
 665         b64_from_24bit (buf[21], buf[1], buf[11], 4);
 666         b64_from_24bit (buf[12], buf[22], buf[2], 4);
 667         b64_from_24bit (buf[3], buf[13], buf[23], 4);
 668         b64_from_24bit (buf[24], buf[4], buf[14], 4);
 669         b64_from_24bit (buf[15], buf[25], buf[5], 4);
 670         b64_from_24bit (buf[6], buf[16], buf[26], 4);
 671         b64_from_24bit (buf[27], buf[7], buf[17], 4);
 672         b64_from_24bit (buf[18], buf[28], buf[8], 4);
 673         b64_from_24bit (buf[9], buf[19], buf[29], 4);
 674         b64_from_24bit (0, buf[31], buf[30], 3);
 675         break;
 676     case '6':
 677         b64_from_24bit (buf[0], buf[21], buf[42], 4);
 678         b64_from_24bit (buf[22], buf[43], buf[1], 4);
 679         b64_from_24bit (buf[44], buf[2], buf[23], 4);
 680         b64_from_24bit (buf[3], buf[24], buf[45], 4);
 681         b64_from_24bit (buf[25], buf[46], buf[4], 4);
 682         b64_from_24bit (buf[47], buf[5], buf[26], 4);
 683         b64_from_24bit (buf[6], buf[27], buf[48], 4);
 684         b64_from_24bit (buf[28], buf[49], buf[7], 4);
 685         b64_from_24bit (buf[50], buf[8], buf[29], 4);
 686         b64_from_24bit (buf[9], buf[30], buf[51], 4);
 687         b64_from_24bit (buf[31], buf[52], buf[10], 4);
 688         b64_from_24bit (buf[53], buf[11], buf[32], 4);
 689         b64_from_24bit (buf[12], buf[33], buf[54], 4);
 690         b64_from_24bit (buf[34], buf[55], buf[13], 4);
 691         b64_from_24bit (buf[56], buf[14], buf[35], 4);
 692         b64_from_24bit (buf[15], buf[36], buf[57], 4);
 693         b64_from_24bit (buf[37], buf[58], buf[16], 4);
 694         b64_from_24bit (buf[59], buf[17], buf[38], 4);
 695         b64_from_24bit (buf[18], buf[39], buf[60], 4);
 696         b64_from_24bit (buf[40], buf[61], buf[19], 4);
 697         b64_from_24bit (buf[62], buf[20], buf[41], 4);
 698         b64_from_24bit (0, 0, buf[63], 2);
 699         break;
 700     default:
 701         goto err;
 702     }
 703     *cp = '\0';
 704
 705     return out_buf;
 706
 707  err:
 708     EVP_MD_CTX_free(md2);
 709     EVP_MD_CTX_free(md);
 710     OPENSSL_free(p_bytes);
 711     OPENSSL_free(s_bytes);
 712     return NULL;
 713 }
 714 # endif
 715
 716 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
 717                      char *passwd, BIO *out, int quiet, int table,
 718                      int reverse, size_t pw_maxlen, passwd_modes mode)
 719 {
 720     char *hash = NULL;
 721
 722     assert(salt_p != NULL);
 723     assert(salt_malloc_p != NULL);
 724
 725     /* first make sure we have a salt */
 726     if (!passed_salt) {
 727 # ifndef OPENSSL_NO_DES
 728         if (mode == passwd_crypt) {
 729             if (*salt_malloc_p == NULL) {
 730                 *salt_p = *salt_malloc_p = app_malloc(3, "salt buffer");
 731             }
 732             if (RAND_bytes((unsigned char *)*salt_p, 2) <= 0)
 733                 goto end;
 734             (*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
 735             (*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
 736             (*salt_p)[2] = 0;
 737 #  ifdef CHARSET_EBCDIC
 738             ascii2ebcdic(*salt_p, *salt_p, 2); /* des_crypt will convert back
 739                                                 * to ASCII */
 740 #  endif
 741         }
 742 # endif                         /* !OPENSSL_NO_DES */
 743
 744 # ifndef NO_MD5CRYPT_1
 745         if (mode == passwd_md5 || mode == passwd_apr1) {
 746             int i;
 747
 748             if (*salt_malloc_p == NULL) {
 749                 *salt_p = *salt_malloc_p = app_malloc(9, "salt buffer");
 750             }
 751             if (RAND_bytes((unsigned char *)*salt_p, 8) <= 0)
 752                 goto end;
 753
 754             for (i = 0; i < 8; i++)
 755                 (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 756             (*salt_p)[8] = 0;
 757         }
 758 # endif                         /* !NO_MD5CRYPT_1 */
 759
 760 # ifndef NO_SHACRYPT
 761         if (mode == passwd_sha256 || mode == passwd_sha512) {
 762             int i;
 763
 764             if (*salt_malloc_p == NULL) {
 765                 *salt_p = *salt_malloc_p = app_malloc(17, "salt buffer");
 766             }
 767             if (RAND_bytes((unsigned char *)*salt_p, 16) <= 0)
 768                 goto end;
 769
 770             for (i = 0; i < 16; i++)
 771                 (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 772             (*salt_p)[16] = 0;
 773         }
 774 # endif                         /* !NO_SHACRYPT */
 775     }
 776
 777     assert(*salt_p != NULL);
 778
 779     /* truncate password if necessary */
 780     if ((strlen(passwd) > pw_maxlen)) {
 781         if (!quiet)
 782             /*
 783              * XXX: really we should know how to print a size_t, not cast it
 784              */
 785             BIO_printf(bio_err,
 786                        "Warning: truncating password to %u characters\n",
 787                        (unsigned)pw_maxlen);
 788         passwd[pw_maxlen] = 0;
 789     }
 790     assert(strlen(passwd) <= pw_maxlen);
 791
 792     /* now compute password hash */
 793 # ifndef OPENSSL_NO_DES
 794     if (mode == passwd_crypt)
 795         hash = DES_crypt(passwd, *salt_p);
 796 # endif
 797 # ifndef NO_MD5CRYPT_1
 798     if (mode == passwd_md5 || mode == passwd_apr1)
 799         hash = md5crypt(passwd, (mode == passwd_md5 ? "1" : "apr1"), *salt_p);
 800 # endif
 801 # ifndef NO_SHACRYPT
 802     if (mode == passwd_sha256 || mode == passwd_sha512)
 803         hash = shacrypt(passwd, (mode == passwd_sha256 ? "5" : "6"), *salt_p);
 804 # endif
 805     assert(hash != NULL);
 806
 807     if (table && !reverse)
 808         BIO_printf(out, "%s\t%s\n", passwd, hash);
 809     else if (table && reverse)
 810         BIO_printf(out, "%s\t%s\n", hash, passwd);
 811     else
 812         BIO_printf(out, "%s\n", hash);
 813     return 1;
 814
 815  end:
 816     return 0;
 817 }
 818 #else
 819
 820 int passwd_main(int argc, char **argv)
 821 {
 822     BIO_printf(bio_err, "Program not available.\n");
 823     return (1);
 824 }
 825 #endif