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_aixmd5
  58 } passwd_modes;
  59
  60 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
  61                      char *passwd, BIO *out, int quiet, int table,
  62                      int reverse, size_t pw_maxlen, passwd_modes mode);
  63
  64 typedef enum OPTION_choice {
  65     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  66     OPT_IN,
  67     OPT_NOVERIFY, OPT_QUIET, OPT_TABLE, OPT_REVERSE, OPT_APR1,
  68     OPT_1, OPT_5, OPT_6, OPT_CRYPT, OPT_AIXMD5, OPT_SALT, OPT_STDIN
  69 } OPTION_CHOICE;
  70
  71 const OPTIONS passwd_options[] = {
  72     {"help", OPT_HELP, '-', "Display this summary"},
  73     {"in", OPT_IN, '<', "Pead passwords from file"},
  74     {"noverify", OPT_NOVERIFY, '-',
  75      "Never verify when reading password from terminal"},
  76     {"quiet", OPT_QUIET, '-', "No warnings"},
  77     {"table", OPT_TABLE, '-', "Format output as table"},
  78     {"reverse", OPT_REVERSE, '-', "Switch table columns"},
  79     {"salt", OPT_SALT, 's', "Use provided salt"},
  80     {"stdin", OPT_STDIN, '-', "Read passwords from stdin"},
  81 # ifndef NO_SHACRYPT
  82     {"6", OPT_6, '-', "SHA512-based password algorithm"},
  83     {"5", OPT_5, '-', "SHA256-based password algorithm"},
  84 # endif
  85 # ifndef NO_MD5CRYPT_1
  86     {"apr1", OPT_APR1, '-', "MD5-based password algorithm, Apache variant"},
  87     {"1", OPT_1, '-', "MD5-based password algorithm"},
  88     {"aixmd5", OPT_AIXMD5, '-', "AIX MD5-based password algorithm"},
  89 # endif
  90 # ifndef OPENSSL_NO_DES
  91     {"crypt", OPT_CRYPT, '-', "Standard Unix password algorithm (default)"},
  92 # endif
  93     {NULL}
  94 };
  95
  96 int passwd_main(int argc, char **argv)
  97 {
  98     BIO *in = NULL;
  99     char *infile = NULL, *salt = NULL, *passwd = NULL, **passwds = NULL;
 100     char *salt_malloc = NULL, *passwd_malloc = NULL, *prog;
 101     OPTION_CHOICE o;
 102     int in_stdin = 0, pw_source_defined = 0;
 103 #ifndef OPENSSL_NO_UI
 104     int in_noverify = 0;
 105 #endif
 106     int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
 107     int ret = 1;
 108     passwd_modes mode = passwd_unset;
 109     size_t passwd_malloc_size = 0;
 110     size_t pw_maxlen = 256; /* arbitrary limit, should be enough for most
 111                              * passwords */
 112
 113     prog = opt_init(argc, argv, passwd_options);
 114     while ((o = opt_next()) != OPT_EOF) {
 115         switch (o) {
 116         case OPT_EOF:
 117         case OPT_ERR:
 118  opthelp:
 119             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 120             goto end;
 121         case OPT_HELP:
 122             opt_help(passwd_options);
 123             ret = 0;
 124             goto end;
 125         case OPT_IN:
 126             if (pw_source_defined)
 127                 goto opthelp;
 128             infile = opt_arg();
 129             pw_source_defined = 1;
 130             break;
 131         case OPT_NOVERIFY:
 132 #ifndef OPENSSL_NO_UI
 133             in_noverify = 1;
 134 #endif
 135             break;
 136         case OPT_QUIET:
 137             quiet = 1;
 138             break;
 139         case OPT_TABLE:
 140             table = 1;
 141             break;
 142         case OPT_REVERSE:
 143             reverse = 1;
 144             break;
 145         case OPT_1:
 146             if (mode != passwd_unset)
 147                 goto opthelp;
 148             mode = passwd_md5;
 149             break;
 150         case OPT_5:
 151             if (mode != passwd_unset)
 152                 goto opthelp;
 153             mode = passwd_sha256;
 154             break;
 155         case OPT_6:
 156             if (mode != passwd_unset)
 157                 goto opthelp;
 158             mode = passwd_sha512;
 159             break;
 160         case OPT_APR1:
 161             if (mode != passwd_unset)
 162                 goto opthelp;
 163             mode = passwd_apr1;
 164             break;
 165         case OPT_AIXMD5:
 166             if (mode != passwd_unset)
 167                 goto opthelp;
 168             mode = passwd_aixmd5;
 169             break;
 170         case OPT_CRYPT:
 171             if (mode != passwd_unset)
 172                 goto opthelp;
 173             mode = passwd_crypt;
 174             break;
 175         case OPT_SALT:
 176             passed_salt = 1;
 177             salt = opt_arg();
 178             break;
 179         case OPT_STDIN:
 180             if (pw_source_defined)
 181                 goto opthelp;
 182             in_stdin = 1;
 183             pw_source_defined = 1;
 184             break;
 185         }
 186     }
 187     argc = opt_num_rest();
 188     argv = opt_rest();
 189
 190     if (*argv) {
 191         if (pw_source_defined)
 192             goto opthelp;
 193         pw_source_defined = 1;
 194         passwds = argv;
 195     }
 196
 197     if (mode == passwd_unset) {
 198         /* use default */
 199         mode = passwd_crypt;
 200     }
 201
 202 # ifdef OPENSSL_NO_DES
 203     if (mode == passwd_crypt)
 204         goto opthelp;
 205 # endif
 206 # ifdef NO_MD5CRYPT_1
 207     if (mode == passwd_md5 || mode == passwd_apr1 || mode == passwd_aixmd5)
 208         goto opthelp;
 209 # endif
 210 # ifdef NO_SHACRYPT
 211     if (mode == passwd_sha256 || mode == passwd_sha512)
 212         goto opthelp;
 213 # endif
 214
 215     if (infile != NULL && in_stdin) {
 216         BIO_printf(bio_err, "%s: Can't combine -in and -stdin\n", prog);
 217         goto end;
 218     }
 219
 220     if (infile != NULL || in_stdin) {
 221         /*
 222          * If in_stdin is true, we know that infile is NULL, and that
 223          * bio_open_default() will give us back an alias for stdin.
 224          */
 225         in = bio_open_default(infile, 'r', FORMAT_TEXT);
 226         if (in == NULL)
 227             goto end;
 228     }
 229
 230     if (mode == passwd_crypt)
 231         pw_maxlen = 8;
 232
 233     if (passwds == NULL) {
 234         /* no passwords on the command line */
 235
 236         passwd_malloc_size = pw_maxlen + 2;
 237         /* longer than necessary so that we can warn about truncation */
 238         passwd = passwd_malloc =
 239             app_malloc(passwd_malloc_size, "password buffer");
 240     }
 241
 242     if ((in == NULL) && (passwds == NULL)) {
 243         if (1) {
 244 #ifndef OPENSSL_NO_UI
 245             /* build a null-terminated list */
 246             static char *passwds_static[2] = { NULL, NULL };
 247
 248             passwds = passwds_static;
 249             if (in == NULL)
 250                 if (EVP_read_pw_string
 251                     (passwd_malloc, passwd_malloc_size, "Password: ",
 252                      !(passed_salt || in_noverify)) != 0)
 253                     goto end;
 254             passwds[0] = passwd_malloc;
 255         } else {
 256 #endif
 257             BIO_printf(bio_err, "password required\n");
 258             goto end;
 259         }
 260     }
 261
 262
 263     if (in == NULL) {
 264         assert(passwds != NULL);
 265         assert(*passwds != NULL);
 266
 267         do {                    /* loop over list of passwords */
 268             passwd = *passwds++;
 269             if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, bio_out,
 270                            quiet, table, reverse, pw_maxlen, mode))
 271                 goto end;
 272         }
 273         while (*passwds != NULL);
 274     } else
 275         /* in != NULL */
 276     {
 277         int done;
 278
 279         assert(passwd != NULL);
 280         do {
 281             int r = BIO_gets(in, passwd, pw_maxlen + 1);
 282             if (r > 0) {
 283                 char *c = (strchr(passwd, '\n'));
 284                 if (c != NULL)
 285                     *c = 0;     /* truncate at newline */
 286                 else {
 287                     /* ignore rest of line */
 288                     char trash[BUFSIZ];
 289                     do
 290                         r = BIO_gets(in, trash, sizeof trash);
 291                     while ((r > 0) && (!strchr(trash, '\n')));
 292                 }
 293
 294                 if (!do_passwd
 295                     (passed_salt, &salt, &salt_malloc, passwd, bio_out, quiet,
 296                      table, reverse, pw_maxlen, mode))
 297                     goto end;
 298             }
 299             done = (r <= 0);
 300         }
 301         while (!done);
 302     }
 303     ret = 0;
 304
 305  end:
 306     ERR_print_errors(bio_err);
 307     OPENSSL_free(salt_malloc);
 308     OPENSSL_free(passwd_malloc);
 309     BIO_free(in);
 310     return (ret);
 311 }
 312
 313 # ifndef NO_MD5CRYPT_1
 314 /*
 315  * MD5-based password algorithm (should probably be available as a library
 316  * function; then the static buffer would not be acceptable). For magic
 317  * string "1", this should be compatible to the MD5-based BSD password
 318  * algorithm. For 'magic' string "apr1", this is compatible to the MD5-based
 319  * Apache password algorithm. (Apparently, the Apache password algorithm is
 320  * identical except that the 'magic' string was changed -- the laziest
 321  * application of the NIH principle I've ever encountered.)
 322  */
 323 static char *md5crypt(const char *passwd, const char *magic, const char *salt)
 324 {
 325     /* "$apr1$..salt..$.......md5hash..........\0" */
 326     static char out_buf[6 + 9 + 24 + 2];
 327     unsigned char buf[MD5_DIGEST_LENGTH];
 328     char *salt_out;
 329     int n;
 330     unsigned int i;
 331     EVP_MD_CTX *md = NULL, *md2 = NULL;
 332     size_t passwd_len, salt_len, magic_len;
 333
 334     passwd_len = strlen(passwd);
 335
 336     out_buf[0] = 0;
 337     magic_len = strlen(magic);
 338
 339     if (magic_len > 0) {
 340         out_buf[0] = '$';
 341         out_buf[1] = 0;
 342
 343         if (magic_len > 4)    /* assert it's  "1" or "apr1" */
 344             return NULL;
 345
 346         OPENSSL_strlcat(out_buf, magic, sizeof out_buf);
 347         OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 348     }
 349
 350     OPENSSL_strlcat(out_buf, salt, sizeof out_buf);
 351
 352     if (strlen(out_buf) > 6 + 8) /* assert "$apr1$..salt.." */
 353         return NULL;
 354
 355     salt_out = out_buf;
 356     if (magic_len > 0)
 357         salt_out += 2 + magic_len;
 358     salt_len = strlen(salt_out);
 359
 360     if (salt_len > 8)
 361         return NULL;
 362
 363     md = EVP_MD_CTX_new();
 364     if (md == NULL
 365         || !EVP_DigestInit_ex(md, EVP_md5(), NULL)
 366         || !EVP_DigestUpdate(md, passwd, passwd_len))
 367         goto err;
 368
 369     if (magic_len > 0)
 370         if (!EVP_DigestUpdate(md, "$", 1)
 371             || !EVP_DigestUpdate(md, magic, magic_len)
 372             || !EVP_DigestUpdate(md, "$", 1))
 373           goto err;
 374
 375     if (!EVP_DigestUpdate(md, salt_out, salt_len))
 376         goto err;
 377
 378     md2 = EVP_MD_CTX_new();
 379     if (md2 == NULL
 380         || !EVP_DigestInit_ex(md2, EVP_md5(), NULL)
 381         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 382         || !EVP_DigestUpdate(md2, salt_out, salt_len)
 383         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 384         || !EVP_DigestFinal_ex(md2, buf, NULL))
 385         goto err;
 386
 387     for (i = passwd_len; i > sizeof buf; i -= sizeof buf) {
 388         if (!EVP_DigestUpdate(md, buf, sizeof buf))
 389             goto err;
 390     }
 391     if (!EVP_DigestUpdate(md, buf, i))
 392         goto err;
 393
 394     n = passwd_len;
 395     while (n) {
 396         if (!EVP_DigestUpdate(md, (n & 1) ? "\0" : passwd, 1))
 397             goto err;
 398         n >>= 1;
 399     }
 400     if (!EVP_DigestFinal_ex(md, buf, NULL))
 401         return NULL;
 402
 403     for (i = 0; i < 1000; i++) {
 404         if (!EVP_DigestInit_ex(md2, EVP_md5(), NULL))
 405             goto err;
 406         if (!EVP_DigestUpdate(md2,
 407                               (i & 1) ? (unsigned const char *)passwd : buf,
 408                               (i & 1) ? passwd_len : sizeof buf))
 409             goto err;
 410         if (i % 3) {
 411             if (!EVP_DigestUpdate(md2, salt_out, salt_len))
 412                 goto err;
 413         }
 414         if (i % 7) {
 415             if (!EVP_DigestUpdate(md2, passwd, passwd_len))
 416                 goto err;
 417         }
 418         if (!EVP_DigestUpdate(md2,
 419                               (i & 1) ? buf : (unsigned const char *)passwd,
 420                               (i & 1) ? sizeof buf : passwd_len))
 421                 goto err;
 422         if (!EVP_DigestFinal_ex(md2, buf, NULL))
 423                 goto err;
 424     }
 425     EVP_MD_CTX_free(md2);
 426     EVP_MD_CTX_free(md);
 427     md2 = NULL;
 428     md = NULL;
 429
 430     {
 431         /* transform buf into output string */
 432         unsigned char buf_perm[sizeof buf];
 433         int dest, source;
 434         char *output;
 435
 436         /* silly output permutation */
 437         for (dest = 0, source = 0; dest < 14;
 438              dest++, source = (source + 6) % 17)
 439             buf_perm[dest] = buf[source];
 440         buf_perm[14] = buf[5];
 441         buf_perm[15] = buf[11];
 442 #  ifndef PEDANTIC              /* Unfortunately, this generates a "no
 443                                  * effect" warning */
 444         assert(16 == sizeof buf_perm);
 445 #  endif
 446
 447         output = salt_out + salt_len;
 448         assert(output == out_buf + strlen(out_buf));
 449
 450         *output++ = '$';
 451
 452         for (i = 0; i < 15; i += 3) {
 453             *output++ = cov_2char[buf_perm[i + 2] & 0x3f];
 454             *output++ = cov_2char[((buf_perm[i + 1] & 0xf) << 2) |
 455                                   (buf_perm[i + 2] >> 6)];
 456             *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
 457                                   (buf_perm[i + 1] >> 4)];
 458             *output++ = cov_2char[buf_perm[i] >> 2];
 459         }
 460         assert(i == 15);
 461         *output++ = cov_2char[buf_perm[i] & 0x3f];
 462         *output++ = cov_2char[buf_perm[i] >> 6];
 463         *output = 0;
 464         assert(strlen(out_buf) < sizeof(out_buf));
 465     }
 466
 467     return out_buf;
 468
 469  err:
 470     EVP_MD_CTX_free(md2);
 471     EVP_MD_CTX_free(md);
 472     return NULL;
 473 }
 474 # endif
 475
 476 # ifndef NO_SHACRYPT
 477 /*
 478  * SHA based password algorithm, describe by Ulrich Drepper here:
 479  * https://www.akkadia.org/drepper/SHA-crypt.txt
 480  * (note that it's in the public domain)
 481  */
 482 static char *shacrypt(const char *passwd, const char *magic, const char *salt)
 483 {
 484     /* Prefix for optional rounds specification.  */
 485     static const char rounds_prefix[] = "rounds=";
 486     /* Maximum salt string length.  */
 487 #define SALT_LEN_MAX 16
 488     /* Default number of rounds if not explicitly specified.  */
 489 #define ROUNDS_DEFAULT 5000
 490     /* Minimum number of rounds.  */
 491 #define ROUNDS_MIN 1000
 492     /* Maximum number of rounds.  */
 493 #define ROUNDS_MAX 999999999
 494
 495     /* "$6$rounds=<N>$......salt......$...shahash(up to 86 chars)...\0" */
 496     static char out_buf[3 + 17 + 17 + 86 + 1];
 497     unsigned char buf[SHA512_DIGEST_LENGTH];
 498     unsigned char temp_buf[SHA512_DIGEST_LENGTH];
 499     size_t buf_size = 0;
 500     char salt_copy[17];          /* Max 16 chars plus '\0' */
 501     size_t n;
 502     EVP_MD_CTX *md = NULL, *md2 = NULL;
 503     const EVP_MD *sha = NULL;
 504     size_t passwd_len, salt_len, magic_len;
 505     size_t rounds = 5000;        /* Default */
 506     char rounds_custom = 0;
 507     char *p_bytes = NULL;
 508     char *s_bytes = NULL;
 509     char *cp = NULL;
 510
 511     passwd_len = strlen(passwd);
 512     magic_len = strlen(magic);
 513
 514     /* assert it's "5" or "6" */
 515     if (magic_len != 1)
 516         return NULL;
 517
 518     switch (magic[0]) {
 519     case '5':
 520         sha = EVP_sha256();
 521         buf_size = 32;
 522         break;
 523     case '6':
 524         sha = EVP_sha512();
 525         buf_size = 64;
 526         break;
 527     default:
 528         return NULL;
 529     }
 530
 531     if (strncmp(salt, rounds_prefix, sizeof(rounds_prefix) - 1) == 0) {
 532         const char *num = salt + sizeof(rounds_prefix) - 1;
 533         char *endp;
 534         unsigned long int srounds = strtoul (num, &endp, 10);
 535         if (*endp == '$') {
 536             salt = endp + 1;
 537             if (srounds > ROUNDS_MAX)
 538                 rounds = ROUNDS_MAX;
 539             else if (srounds < ROUNDS_MIN)
 540                 rounds = ROUNDS_MIN;
 541             else
 542                 rounds = srounds;
 543             rounds_custom = 1;
 544         } else {
 545             return NULL;
 546         }
 547     }
 548
 549     /* The salt gets truncated to 16 chars */
 550     OPENSSL_strlcpy(salt_copy, salt, sizeof salt_copy);
 551     salt_len = strlen(salt_copy);
 552
 553     out_buf[0] = 0;
 554     OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 555     OPENSSL_strlcat(out_buf, magic, sizeof out_buf);
 556     OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 557     if (rounds_custom) {
 558         char tmp_buf[7 + 9 + 1]; /* "rounds=999999999" */
 559         sprintf(tmp_buf, "rounds=%lu", rounds);
 560         OPENSSL_strlcat(out_buf, tmp_buf, sizeof out_buf);
 561         OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 562     }
 563     OPENSSL_strlcat(out_buf, salt_copy, sizeof out_buf);
 564
 565     /* assert "$5$rounds=999999999$......salt......" */
 566     if (strlen(out_buf) > 3 + 17 * rounds_custom + salt_len )
 567         return NULL;
 568
 569     md = EVP_MD_CTX_new();
 570     if (md == NULL
 571         || !EVP_DigestInit_ex(md, sha, NULL)
 572         || !EVP_DigestUpdate(md, passwd, passwd_len)
 573         || !EVP_DigestUpdate(md, salt_copy, salt_len))
 574         goto err;
 575
 576     md2 = EVP_MD_CTX_new();
 577     if (md2 == NULL
 578         || !EVP_DigestInit_ex(md2, sha, NULL)
 579         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 580         || !EVP_DigestUpdate(md2, salt_copy, salt_len)
 581         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 582         || !EVP_DigestFinal_ex(md2, buf, NULL))
 583         goto err;
 584
 585     for (n = passwd_len; n > buf_size; n -= buf_size) {
 586         if (!EVP_DigestUpdate(md, buf, buf_size))
 587             goto err;
 588     }
 589     if (!EVP_DigestUpdate(md, buf, n))
 590         goto err;
 591
 592     n = passwd_len;
 593     while (n) {
 594         if (!EVP_DigestUpdate(md,
 595                               (n & 1) ? buf : (unsigned const char *)passwd,
 596                               (n & 1) ? buf_size : passwd_len))
 597             goto err;
 598         n >>= 1;
 599     }
 600     if (!EVP_DigestFinal_ex(md, buf, NULL))
 601         return NULL;
 602
 603     /* P sequence */
 604     if (!EVP_DigestInit_ex(md2, sha, NULL))
 605         goto err;
 606
 607     for (n = passwd_len; n > 0; n--)
 608         if (!EVP_DigestUpdate(md2, passwd, passwd_len))
 609             goto err;
 610
 611     if (!EVP_DigestFinal_ex(md2, temp_buf, NULL))
 612         return NULL;
 613
 614     if ((p_bytes = OPENSSL_zalloc(passwd_len)) == NULL)
 615         goto err;
 616     for (cp = p_bytes, n = passwd_len; n > buf_size; n -= buf_size, cp += buf_size)
 617         memcpy(cp, temp_buf, buf_size);
 618     memcpy(cp, temp_buf, n);
 619
 620     /* S sequence */
 621     if (!EVP_DigestInit_ex(md2, sha, NULL))
 622         goto err;
 623
 624     for (n = 16 + buf[0]; n > 0; n--)
 625         if (!EVP_DigestUpdate(md2, salt, salt_len))
 626             goto err;
 627
 628     if (!EVP_DigestFinal_ex(md2, temp_buf, NULL))
 629         return NULL;
 630
 631     if ((s_bytes = OPENSSL_zalloc(salt_len)) == NULL)
 632         goto err;
 633     for (cp = s_bytes, n = salt_len; n > buf_size; n -= buf_size, cp += buf_size)
 634         memcpy(cp, temp_buf, buf_size);
 635     memcpy(cp, temp_buf, n);
 636
 637     for (n = 0; n < rounds; n++) {
 638         if (!EVP_DigestInit_ex(md2, sha, NULL))
 639             goto err;
 640         if (!EVP_DigestUpdate(md2,
 641                               (n & 1) ? (unsigned const char *)p_bytes : buf,
 642                               (n & 1) ? passwd_len : buf_size))
 643             goto err;
 644         if (n % 3) {
 645             if (!EVP_DigestUpdate(md2, s_bytes, salt_len))
 646                 goto err;
 647         }
 648         if (n % 7) {
 649             if (!EVP_DigestUpdate(md2, p_bytes, passwd_len))
 650                 goto err;
 651         }
 652         if (!EVP_DigestUpdate(md2,
 653                               (n & 1) ? buf : (unsigned const char *)p_bytes,
 654                               (n & 1) ? buf_size : passwd_len))
 655                 goto err;
 656         if (!EVP_DigestFinal_ex(md2, buf, NULL))
 657                 goto err;
 658     }
 659     EVP_MD_CTX_free(md2);
 660     EVP_MD_CTX_free(md);
 661     md2 = NULL;
 662     md = NULL;
 663     OPENSSL_free(p_bytes);
 664     OPENSSL_free(s_bytes);
 665     p_bytes = NULL;
 666     s_bytes = NULL;
 667
 668     cp = out_buf + strlen(out_buf);
 669     *cp++ = '$';
 670
 671 #define b64_from_24bit(B2, B1, B0, N)                                   \
 672     do {                                                                \
 673         unsigned int w = ((B2) << 16) | ((B1) << 8) | (B0);             \
 674         int i = (N);                                                    \
 675         while (i-- > 0)                                                 \
 676             {                                                           \
 677                 *cp++ = cov_2char[w & 0x3f];                            \
 678                 w >>= 6;                                                \
 679             }                                                           \
 680     } while (0)
 681
 682     switch (*magic) {
 683     case '5':
 684         b64_from_24bit (buf[0], buf[10], buf[20], 4);
 685         b64_from_24bit (buf[21], buf[1], buf[11], 4);
 686         b64_from_24bit (buf[12], buf[22], buf[2], 4);
 687         b64_from_24bit (buf[3], buf[13], buf[23], 4);
 688         b64_from_24bit (buf[24], buf[4], buf[14], 4);
 689         b64_from_24bit (buf[15], buf[25], buf[5], 4);
 690         b64_from_24bit (buf[6], buf[16], buf[26], 4);
 691         b64_from_24bit (buf[27], buf[7], buf[17], 4);
 692         b64_from_24bit (buf[18], buf[28], buf[8], 4);
 693         b64_from_24bit (buf[9], buf[19], buf[29], 4);
 694         b64_from_24bit (0, buf[31], buf[30], 3);
 695         break;
 696     case '6':
 697         b64_from_24bit (buf[0], buf[21], buf[42], 4);
 698         b64_from_24bit (buf[22], buf[43], buf[1], 4);
 699         b64_from_24bit (buf[44], buf[2], buf[23], 4);
 700         b64_from_24bit (buf[3], buf[24], buf[45], 4);
 701         b64_from_24bit (buf[25], buf[46], buf[4], 4);
 702         b64_from_24bit (buf[47], buf[5], buf[26], 4);
 703         b64_from_24bit (buf[6], buf[27], buf[48], 4);
 704         b64_from_24bit (buf[28], buf[49], buf[7], 4);
 705         b64_from_24bit (buf[50], buf[8], buf[29], 4);
 706         b64_from_24bit (buf[9], buf[30], buf[51], 4);
 707         b64_from_24bit (buf[31], buf[52], buf[10], 4);
 708         b64_from_24bit (buf[53], buf[11], buf[32], 4);
 709         b64_from_24bit (buf[12], buf[33], buf[54], 4);
 710         b64_from_24bit (buf[34], buf[55], buf[13], 4);
 711         b64_from_24bit (buf[56], buf[14], buf[35], 4);
 712         b64_from_24bit (buf[15], buf[36], buf[57], 4);
 713         b64_from_24bit (buf[37], buf[58], buf[16], 4);
 714         b64_from_24bit (buf[59], buf[17], buf[38], 4);
 715         b64_from_24bit (buf[18], buf[39], buf[60], 4);
 716         b64_from_24bit (buf[40], buf[61], buf[19], 4);
 717         b64_from_24bit (buf[62], buf[20], buf[41], 4);
 718         b64_from_24bit (0, 0, buf[63], 2);
 719         break;
 720     default:
 721         goto err;
 722     }
 723     *cp = '\0';
 724
 725     return out_buf;
 726
 727  err:
 728     EVP_MD_CTX_free(md2);
 729     EVP_MD_CTX_free(md);
 730     OPENSSL_free(p_bytes);
 731     OPENSSL_free(s_bytes);
 732     return NULL;
 733 }
 734 # endif
 735
 736 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
 737                      char *passwd, BIO *out, int quiet, int table,
 738                      int reverse, size_t pw_maxlen, passwd_modes mode)
 739 {
 740     char *hash = NULL;
 741
 742     assert(salt_p != NULL);
 743     assert(salt_malloc_p != NULL);
 744
 745     /* first make sure we have a salt */
 746     if (!passed_salt) {
 747 # ifndef OPENSSL_NO_DES
 748         if (mode == passwd_crypt) {
 749             if (*salt_malloc_p == NULL) {
 750                 *salt_p = *salt_malloc_p = app_malloc(3, "salt buffer");
 751             }
 752             if (RAND_bytes((unsigned char *)*salt_p, 2) <= 0)
 753                 goto end;
 754             (*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
 755             (*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
 756             (*salt_p)[2] = 0;
 757 #  ifdef CHARSET_EBCDIC
 758             ascii2ebcdic(*salt_p, *salt_p, 2); /* des_crypt will convert back
 759                                                 * to ASCII */
 760 #  endif
 761         }
 762 # endif                         /* !OPENSSL_NO_DES */
 763
 764 # ifndef NO_MD5CRYPT_1
 765         if (mode == passwd_md5 || mode == passwd_apr1 || mode == passwd_aixmd5) {
 766             int i;
 767
 768             if (*salt_malloc_p == NULL) {
 769                 *salt_p = *salt_malloc_p = app_malloc(9, "salt buffer");
 770             }
 771             if (RAND_bytes((unsigned char *)*salt_p, 8) <= 0)
 772                 goto end;
 773
 774             for (i = 0; i < 8; i++)
 775                 (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 776             (*salt_p)[8] = 0;
 777         }
 778 # endif                         /* !NO_MD5CRYPT_1 */
 779
 780 # ifndef NO_SHACRYPT
 781         if (mode == passwd_sha256 || mode == passwd_sha512) {
 782             int i;
 783
 784             if (*salt_malloc_p == NULL) {
 785                 *salt_p = *salt_malloc_p = app_malloc(17, "salt buffer");
 786             }
 787             if (RAND_bytes((unsigned char *)*salt_p, 16) <= 0)
 788                 goto end;
 789
 790             for (i = 0; i < 16; i++)
 791                 (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 792             (*salt_p)[16] = 0;
 793         }
 794 # endif                         /* !NO_SHACRYPT */
 795     }
 796
 797     assert(*salt_p != NULL);
 798
 799     /* truncate password if necessary */
 800     if ((strlen(passwd) > pw_maxlen)) {
 801         if (!quiet)
 802             /*
 803              * XXX: really we should know how to print a size_t, not cast it
 804              */
 805             BIO_printf(bio_err,
 806                        "Warning: truncating password to %u characters\n",
 807                        (unsigned)pw_maxlen);
 808         passwd[pw_maxlen] = 0;
 809     }
 810     assert(strlen(passwd) <= pw_maxlen);
 811
 812     /* now compute password hash */
 813 # ifndef OPENSSL_NO_DES
 814     if (mode == passwd_crypt)
 815         hash = DES_crypt(passwd, *salt_p);
 816 # endif
 817 # ifndef NO_MD5CRYPT_1
 818     if (mode == passwd_md5 || mode == passwd_apr1)
 819         hash = md5crypt(passwd, (mode == passwd_md5 ? "1" : "apr1"), *salt_p);
 820     if (mode == passwd_aixmd5)
 821         hash = md5crypt(passwd, "", *salt_p);
 822 # endif
 823 # ifndef NO_SHACRYPT
 824     if (mode == passwd_sha256 || mode == passwd_sha512)
 825         hash = shacrypt(passwd, (mode == passwd_sha256 ? "5" : "6"), *salt_p);
 826 # endif
 827     assert(hash != NULL);
 828
 829     if (table && !reverse)
 830         BIO_printf(out, "%s\t%s\n", passwd, hash);
 831     else if (table && reverse)
 832         BIO_printf(out, "%s\t%s\n", hash, passwd);
 833     else
 834         BIO_printf(out, "%s\n", hash);
 835     return 1;
 836
 837  end:
 838     return 0;
 839 }
 840 #else
 841
 842 int passwd_main(int argc, char **argv)
 843 {
 844     BIO_printf(bio_err, "Program not available.\n");
 845     return (1);
 846 }
 847 #endif