apps/passwd.c

   1 /*
   2  * Copyright 2000-2017 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 #include <string.h>
  11
  12 #include "apps.h"
  13
  14 #include <openssl/bio.h>
  15 #include <openssl/err.h>
  16 #include <openssl/evp.h>
  17 #include <openssl/rand.h>
  18 #ifndef OPENSSL_NO_DES
  19 # include <openssl/des.h>
  20 #endif
  21 #include <openssl/md5.h>
  22 #include <openssl/sha.h>
  23
  24 static unsigned const char cov_2char[64] = {
  25     /* from crypto/des/fcrypt.c */
  26     0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
  27     0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44,
  28     0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C,
  29     0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54,
  30     0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62,
  31     0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
  32     0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72,
  33     0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
  34 };
  35
  36 typedef enum {
  37     passwd_unset = 0,
  38     passwd_crypt,
  39     passwd_md5,
  40     passwd_apr1,
  41     passwd_sha256,
  42     passwd_sha512,
  43     passwd_aixmd5
  44 } passwd_modes;
  45
  46 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
  47                      char *passwd, BIO *out, int quiet, int table,
  48                      int reverse, size_t pw_maxlen, passwd_modes mode);
  49
  50 typedef enum OPTION_choice {
  51     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  52     OPT_IN,
  53     OPT_NOVERIFY, OPT_QUIET, OPT_TABLE, OPT_REVERSE, OPT_APR1,
  54     OPT_1, OPT_5, OPT_6, OPT_CRYPT, OPT_AIXMD5, OPT_SALT, OPT_STDIN,
  55     OPT_R_ENUM
  56 } OPTION_CHOICE;
  57
  58 const OPTIONS passwd_options[] = {
  59     {"help", OPT_HELP, '-', "Display this summary"},
  60     {"in", OPT_IN, '<', "Read passwords from file"},
  61     {"noverify", OPT_NOVERIFY, '-',
  62      "Never verify when reading password from terminal"},
  63     {"quiet", OPT_QUIET, '-', "No warnings"},
  64     {"table", OPT_TABLE, '-', "Format output as table"},
  65     {"reverse", OPT_REVERSE, '-', "Switch table columns"},
  66     {"salt", OPT_SALT, 's', "Use provided salt"},
  67     {"stdin", OPT_STDIN, '-', "Read passwords from stdin"},
  68     {"6", OPT_6, '-', "SHA512-based password algorithm"},
  69     {"5", OPT_5, '-', "SHA256-based password algorithm"},
  70     {"apr1", OPT_APR1, '-', "MD5-based password algorithm, Apache variant"},
  71     {"1", OPT_1, '-', "MD5-based password algorithm"},
  72     {"aixmd5", OPT_AIXMD5, '-', "AIX MD5-based password algorithm"},
  73 #ifndef OPENSSL_NO_DES
  74     {"crypt", OPT_CRYPT, '-', "Standard Unix password algorithm (default)"},
  75 #endif
  76     OPT_R_OPTIONS,
  77     {NULL}
  78 };
  79
  80 int passwd_main(int argc, char **argv)
  81 {
  82     BIO *in = NULL;
  83     char *infile = NULL, *salt = NULL, *passwd = NULL, **passwds = NULL;
  84     char *salt_malloc = NULL, *passwd_malloc = NULL, *prog;
  85     OPTION_CHOICE o;
  86     int in_stdin = 0, pw_source_defined = 0;
  87 #ifndef OPENSSL_NO_UI_CONSOLE
  88     int in_noverify = 0;
  89 #endif
  90     int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
  91     int ret = 1;
  92     passwd_modes mode = passwd_unset;
  93     size_t passwd_malloc_size = 0;
  94     size_t pw_maxlen = 256; /* arbitrary limit, should be enough for most
  95                              * passwords */
  96
  97     prog = opt_init(argc, argv, passwd_options);
  98     while ((o = opt_next()) != OPT_EOF) {
  99         switch (o) {
 100         case OPT_EOF:
 101         case OPT_ERR:
 102  opthelp:
 103             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 104             goto end;
 105         case OPT_HELP:
 106             opt_help(passwd_options);
 107             ret = 0;
 108             goto end;
 109         case OPT_IN:
 110             if (pw_source_defined)
 111                 goto opthelp;
 112             infile = opt_arg();
 113             pw_source_defined = 1;
 114             break;
 115         case OPT_NOVERIFY:
 116 #ifndef OPENSSL_NO_UI_CONSOLE
 117             in_noverify = 1;
 118 #endif
 119             break;
 120         case OPT_QUIET:
 121             quiet = 1;
 122             break;
 123         case OPT_TABLE:
 124             table = 1;
 125             break;
 126         case OPT_REVERSE:
 127             reverse = 1;
 128             break;
 129         case OPT_1:
 130             if (mode != passwd_unset)
 131                 goto opthelp;
 132             mode = passwd_md5;
 133             break;
 134         case OPT_5:
 135             if (mode != passwd_unset)
 136                 goto opthelp;
 137             mode = passwd_sha256;
 138             break;
 139         case OPT_6:
 140             if (mode != passwd_unset)
 141                 goto opthelp;
 142             mode = passwd_sha512;
 143             break;
 144         case OPT_APR1:
 145             if (mode != passwd_unset)
 146                 goto opthelp;
 147             mode = passwd_apr1;
 148             break;
 149         case OPT_AIXMD5:
 150             if (mode != passwd_unset)
 151                 goto opthelp;
 152             mode = passwd_aixmd5;
 153             break;
 154         case OPT_CRYPT:
 155 #ifndef OPENSSL_NO_DES
 156             if (mode != passwd_unset)
 157                 goto opthelp;
 158             mode = passwd_crypt;
 159 #endif
 160             break;
 161         case OPT_SALT:
 162             passed_salt = 1;
 163             salt = opt_arg();
 164             break;
 165         case OPT_STDIN:
 166             if (pw_source_defined)
 167                 goto opthelp;
 168             in_stdin = 1;
 169             pw_source_defined = 1;
 170             break;
 171         case OPT_R_CASES:
 172             if (!opt_rand(o))
 173                 goto end;
 174             break;
 175         }
 176     }
 177     argc = opt_num_rest();
 178     argv = opt_rest();
 179
 180     if (*argv != NULL) {
 181         if (pw_source_defined)
 182             goto opthelp;
 183         pw_source_defined = 1;
 184         passwds = argv;
 185     }
 186
 187     if (mode == passwd_unset) {
 188         /* use default */
 189         mode = passwd_crypt;
 190     }
 191
 192 #ifdef OPENSSL_NO_DES
 193     if (mode == passwd_crypt)
 194         goto opthelp;
 195 #endif
 196
 197     if (infile != NULL && in_stdin) {
 198         BIO_printf(bio_err, "%s: Can't combine -in and -stdin\n", prog);
 199         goto end;
 200     }
 201
 202     if (infile != NULL || in_stdin) {
 203         /*
 204          * If in_stdin is true, we know that infile is NULL, and that
 205          * bio_open_default() will give us back an alias for stdin.
 206          */
 207         in = bio_open_default(infile, 'r', FORMAT_TEXT);
 208         if (in == NULL)
 209             goto end;
 210     }
 211
 212     if (mode == passwd_crypt)
 213         pw_maxlen = 8;
 214
 215     if (passwds == NULL) {
 216         /* no passwords on the command line */
 217
 218         passwd_malloc_size = pw_maxlen + 2;
 219         /* longer than necessary so that we can warn about truncation */
 220         passwd = passwd_malloc =
 221             app_malloc(passwd_malloc_size, "password buffer");
 222     }
 223
 224     if ((in == NULL) && (passwds == NULL)) {
 225         /*
 226          * we use the following method to make sure what
 227          * in the 'else' section is always compiled, to
 228          * avoid rot of not-frequently-used code.
 229          */
 230         if (1) {
 231 #ifndef OPENSSL_NO_UI_CONSOLE
 232             /* build a null-terminated list */
 233             static char *passwds_static[2] = { NULL, NULL };
 234
 235             passwds = passwds_static;
 236             if (in == NULL) {
 237                 if (EVP_read_pw_string
 238                     (passwd_malloc, passwd_malloc_size, "Password: ",
 239                      !(passed_salt || in_noverify)) != 0)
 240                     goto end;
 241             }
 242             passwds[0] = passwd_malloc;
 243         } else {
 244 #endif
 245             BIO_printf(bio_err, "password required\n");
 246             goto end;
 247         }
 248     }
 249
 250     if (in == NULL) {
 251         assert(passwds != NULL);
 252         assert(*passwds != NULL);
 253
 254         do {                    /* loop over list of passwords */
 255             passwd = *passwds++;
 256             if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, bio_out,
 257                            quiet, table, reverse, pw_maxlen, mode))
 258                 goto end;
 259         } while (*passwds != NULL);
 260     } else {
 261         /* in != NULL */
 262         int done;
 263
 264         assert(passwd != NULL);
 265         do {
 266             int r = BIO_gets(in, passwd, pw_maxlen + 1);
 267             if (r > 0) {
 268                 char *c = (strchr(passwd, '\n'));
 269                 if (c != NULL) {
 270                     *c = 0;     /* truncate at newline */
 271                 } else {
 272                     /* ignore rest of line */
 273                     char trash[BUFSIZ];
 274                     do
 275                         r = BIO_gets(in, trash, sizeof trash);
 276                     while ((r > 0) && (!strchr(trash, '\n')));
 277                 }
 278
 279                 if (!do_passwd
 280                     (passed_salt, &salt, &salt_malloc, passwd, bio_out, quiet,
 281                      table, reverse, pw_maxlen, mode))
 282                     goto end;
 283             }
 284             done = (r <= 0);
 285         } while (!done);
 286     }
 287     ret = 0;
 288
 289  end:
 290     ERR_print_errors(bio_err);
 291     OPENSSL_free(salt_malloc);
 292     OPENSSL_free(passwd_malloc);
 293     BIO_free(in);
 294     return (ret);
 295 }
 296
 297 /*
 298  * MD5-based password algorithm (should probably be available as a library
 299  * function; then the static buffer would not be acceptable). For magic
 300  * string "1", this should be compatible to the MD5-based BSD password
 301  * algorithm. For 'magic' string "apr1", this is compatible to the MD5-based
 302  * Apache password algorithm. (Apparently, the Apache password algorithm is
 303  * identical except that the 'magic' string was changed -- the laziest
 304  * application of the NIH principle I've ever encountered.)
 305  */
 306 static char *md5crypt(const char *passwd, const char *magic, const char *salt)
 307 {
 308     /* "$apr1$..salt..$.......md5hash..........\0" */
 309     static char out_buf[6 + 9 + 24 + 2];
 310     unsigned char buf[MD5_DIGEST_LENGTH];
 311     char *salt_out;
 312     int n;
 313     unsigned int i;
 314     EVP_MD_CTX *md = NULL, *md2 = NULL;
 315     size_t passwd_len, salt_len, magic_len;
 316
 317     passwd_len = strlen(passwd);
 318
 319     out_buf[0] = 0;
 320     magic_len = strlen(magic);
 321
 322     if (magic_len > 0) {
 323         out_buf[0] = '$';
 324         out_buf[1] = 0;
 325
 326         if (magic_len > 4)    /* assert it's  "1" or "apr1" */
 327             return NULL;
 328
 329         OPENSSL_strlcat(out_buf, magic, sizeof out_buf);
 330         OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 331     }
 332
 333     OPENSSL_strlcat(out_buf, salt, sizeof out_buf);
 334
 335     if (strlen(out_buf) > 6 + 8) /* assert "$apr1$..salt.." */
 336         return NULL;
 337
 338     salt_out = out_buf;
 339     if (magic_len > 0)
 340         salt_out += 2 + magic_len;
 341     salt_len = strlen(salt_out);
 342
 343     if (salt_len > 8)
 344         return NULL;
 345
 346     md = EVP_MD_CTX_new();
 347     if (md == NULL
 348         || !EVP_DigestInit_ex(md, EVP_md5(), NULL)
 349         || !EVP_DigestUpdate(md, passwd, passwd_len))
 350         goto err;
 351
 352     if (magic_len > 0)
 353         if (!EVP_DigestUpdate(md, "$", 1)
 354             || !EVP_DigestUpdate(md, magic, magic_len)
 355             || !EVP_DigestUpdate(md, "$", 1))
 356           goto err;
 357
 358     if (!EVP_DigestUpdate(md, salt_out, salt_len))
 359         goto err;
 360
 361     md2 = EVP_MD_CTX_new();
 362     if (md2 == NULL
 363         || !EVP_DigestInit_ex(md2, EVP_md5(), NULL)
 364         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 365         || !EVP_DigestUpdate(md2, salt_out, salt_len)
 366         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 367         || !EVP_DigestFinal_ex(md2, buf, NULL))
 368         goto err;
 369
 370     for (i = passwd_len; i > sizeof buf; i -= sizeof buf) {
 371         if (!EVP_DigestUpdate(md, buf, sizeof buf))
 372             goto err;
 373     }
 374     if (!EVP_DigestUpdate(md, buf, i))
 375         goto err;
 376
 377     n = passwd_len;
 378     while (n) {
 379         if (!EVP_DigestUpdate(md, (n & 1) ? "\0" : passwd, 1))
 380             goto err;
 381         n >>= 1;
 382     }
 383     if (!EVP_DigestFinal_ex(md, buf, NULL))
 384         return NULL;
 385
 386     for (i = 0; i < 1000; i++) {
 387         if (!EVP_DigestInit_ex(md2, EVP_md5(), NULL))
 388             goto err;
 389         if (!EVP_DigestUpdate(md2,
 390                               (i & 1) ? (unsigned const char *)passwd : buf,
 391                               (i & 1) ? passwd_len : sizeof buf))
 392             goto err;
 393         if (i % 3) {
 394             if (!EVP_DigestUpdate(md2, salt_out, salt_len))
 395                 goto err;
 396         }
 397         if (i % 7) {
 398             if (!EVP_DigestUpdate(md2, passwd, passwd_len))
 399                 goto err;
 400         }
 401         if (!EVP_DigestUpdate(md2,
 402                               (i & 1) ? buf : (unsigned const char *)passwd,
 403                               (i & 1) ? sizeof buf : passwd_len))
 404                 goto err;
 405         if (!EVP_DigestFinal_ex(md2, buf, NULL))
 406                 goto err;
 407     }
 408     EVP_MD_CTX_free(md2);
 409     EVP_MD_CTX_free(md);
 410     md2 = NULL;
 411     md = NULL;
 412
 413     {
 414         /* transform buf into output string */
 415         unsigned char buf_perm[sizeof buf];
 416         int dest, source;
 417         char *output;
 418
 419         /* silly output permutation */
 420         for (dest = 0, source = 0; dest < 14;
 421              dest++, source = (source + 6) % 17)
 422             buf_perm[dest] = buf[source];
 423         buf_perm[14] = buf[5];
 424         buf_perm[15] = buf[11];
 425 # ifndef PEDANTIC              /* Unfortunately, this generates a "no
 426                                  * effect" warning */
 427         assert(16 == sizeof buf_perm);
 428 # endif
 429
 430         output = salt_out + salt_len;
 431         assert(output == out_buf + strlen(out_buf));
 432
 433         *output++ = '$';
 434
 435         for (i = 0; i < 15; i += 3) {
 436             *output++ = cov_2char[buf_perm[i + 2] & 0x3f];
 437             *output++ = cov_2char[((buf_perm[i + 1] & 0xf) << 2) |
 438                                   (buf_perm[i + 2] >> 6)];
 439             *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
 440                                   (buf_perm[i + 1] >> 4)];
 441             *output++ = cov_2char[buf_perm[i] >> 2];
 442         }
 443         assert(i == 15);
 444         *output++ = cov_2char[buf_perm[i] & 0x3f];
 445         *output++ = cov_2char[buf_perm[i] >> 6];
 446         *output = 0;
 447         assert(strlen(out_buf) < sizeof(out_buf));
 448     }
 449
 450     return out_buf;
 451
 452  err:
 453     EVP_MD_CTX_free(md2);
 454     EVP_MD_CTX_free(md);
 455     return NULL;
 456 }
 457
 458 /*
 459  * SHA based password algorithm, describe by Ulrich Drepper here:
 460  * https://www.akkadia.org/drepper/SHA-crypt.txt
 461  * (note that it's in the public domain)
 462  */
 463 static char *shacrypt(const char *passwd, const char *magic, const char *salt)
 464 {
 465     /* Prefix for optional rounds specification.  */
 466     static const char rounds_prefix[] = "rounds=";
 467     /* Maximum salt string length.  */
 468 # define SALT_LEN_MAX 16
 469     /* Default number of rounds if not explicitly specified.  */
 470 # define ROUNDS_DEFAULT 5000
 471     /* Minimum number of rounds.  */
 472 # define ROUNDS_MIN 1000
 473     /* Maximum number of rounds.  */
 474 # define ROUNDS_MAX 999999999
 475
 476     /* "$6$rounds=<N>$......salt......$...shahash(up to 86 chars)...\0" */
 477     static char out_buf[3 + 17 + 17 + 86 + 1];
 478     unsigned char buf[SHA512_DIGEST_LENGTH];
 479     unsigned char temp_buf[SHA512_DIGEST_LENGTH];
 480     size_t buf_size = 0;
 481     char salt_copy[17];          /* Max 16 chars plus '\0' */
 482     size_t n;
 483     EVP_MD_CTX *md = NULL, *md2 = NULL;
 484     const EVP_MD *sha = NULL;
 485     size_t passwd_len, salt_len, magic_len;
 486     unsigned int rounds = 5000;        /* Default */
 487     char rounds_custom = 0;
 488     char *p_bytes = NULL;
 489     char *s_bytes = NULL;
 490     char *cp = NULL;
 491
 492     passwd_len = strlen(passwd);
 493     magic_len = strlen(magic);
 494
 495     /* assert it's "5" or "6" */
 496     if (magic_len != 1)
 497         return NULL;
 498
 499     switch (magic[0]) {
 500     case '5':
 501         sha = EVP_sha256();
 502         buf_size = 32;
 503         break;
 504     case '6':
 505         sha = EVP_sha512();
 506         buf_size = 64;
 507         break;
 508     default:
 509         return NULL;
 510     }
 511
 512     if (strncmp(salt, rounds_prefix, sizeof(rounds_prefix) - 1) == 0) {
 513         const char *num = salt + sizeof(rounds_prefix) - 1;
 514         char *endp;
 515         unsigned long int srounds = strtoul (num, &endp, 10);
 516         if (*endp == '$') {
 517             salt = endp + 1;
 518             if (srounds > ROUNDS_MAX)
 519                 rounds = ROUNDS_MAX;
 520             else if (srounds < ROUNDS_MIN)
 521                 rounds = ROUNDS_MIN;
 522             else
 523                 rounds = (unsigned int)srounds;
 524             rounds_custom = 1;
 525         } else {
 526             return NULL;
 527         }
 528     }
 529
 530     /* The salt gets truncated to 16 chars */
 531     OPENSSL_strlcpy(salt_copy, salt, sizeof salt_copy);
 532     salt_len = strlen(salt_copy);
 533
 534     out_buf[0] = 0;
 535     OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 536     OPENSSL_strlcat(out_buf, magic, sizeof out_buf);
 537     OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 538     if (rounds_custom) {
 539         char tmp_buf[80]; /* "rounds=999999999" */
 540         sprintf(tmp_buf, "rounds=%u", rounds);
 541         OPENSSL_strlcat(out_buf, tmp_buf, sizeof out_buf);
 542         OPENSSL_strlcat(out_buf, "$", sizeof out_buf);
 543     }
 544     OPENSSL_strlcat(out_buf, salt_copy, sizeof out_buf);
 545
 546     /* assert "$5$rounds=999999999$......salt......" */
 547     if (strlen(out_buf) > 3 + 17 * rounds_custom + salt_len )
 548         return NULL;
 549
 550     md = EVP_MD_CTX_new();
 551     if (md == NULL
 552         || !EVP_DigestInit_ex(md, sha, NULL)
 553         || !EVP_DigestUpdate(md, passwd, passwd_len)
 554         || !EVP_DigestUpdate(md, salt_copy, salt_len))
 555         goto err;
 556
 557     md2 = EVP_MD_CTX_new();
 558     if (md2 == NULL
 559         || !EVP_DigestInit_ex(md2, sha, NULL)
 560         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 561         || !EVP_DigestUpdate(md2, salt_copy, salt_len)
 562         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 563         || !EVP_DigestFinal_ex(md2, buf, NULL))
 564         goto err;
 565
 566     for (n = passwd_len; n > buf_size; n -= buf_size) {
 567         if (!EVP_DigestUpdate(md, buf, buf_size))
 568             goto err;
 569     }
 570     if (!EVP_DigestUpdate(md, buf, n))
 571         goto err;
 572
 573     n = passwd_len;
 574     while (n) {
 575         if (!EVP_DigestUpdate(md,
 576                               (n & 1) ? buf : (unsigned const char *)passwd,
 577                               (n & 1) ? buf_size : passwd_len))
 578             goto err;
 579         n >>= 1;
 580     }
 581     if (!EVP_DigestFinal_ex(md, buf, NULL))
 582         return NULL;
 583
 584     /* P sequence */
 585     if (!EVP_DigestInit_ex(md2, sha, NULL))
 586         goto err;
 587
 588     for (n = passwd_len; n > 0; n--)
 589         if (!EVP_DigestUpdate(md2, passwd, passwd_len))
 590             goto err;
 591
 592     if (!EVP_DigestFinal_ex(md2, temp_buf, NULL))
 593         return NULL;
 594
 595     if ((p_bytes = OPENSSL_zalloc(passwd_len)) == NULL)
 596         goto err;
 597     for (cp = p_bytes, n = passwd_len; n > buf_size; n -= buf_size, cp += buf_size)
 598         memcpy(cp, temp_buf, buf_size);
 599     memcpy(cp, temp_buf, n);
 600
 601     /* S sequence */
 602     if (!EVP_DigestInit_ex(md2, sha, NULL))
 603         goto err;
 604
 605     for (n = 16 + buf[0]; n > 0; n--)
 606         if (!EVP_DigestUpdate(md2, salt, salt_len))
 607             goto err;
 608
 609     if (!EVP_DigestFinal_ex(md2, temp_buf, NULL))
 610         return NULL;
 611
 612     if ((s_bytes = OPENSSL_zalloc(salt_len)) == NULL)
 613         goto err;
 614     for (cp = s_bytes, n = salt_len; n > buf_size; n -= buf_size, cp += buf_size)
 615         memcpy(cp, temp_buf, buf_size);
 616     memcpy(cp, temp_buf, n);
 617
 618     for (n = 0; n < rounds; n++) {
 619         if (!EVP_DigestInit_ex(md2, sha, NULL))
 620             goto err;
 621         if (!EVP_DigestUpdate(md2,
 622                               (n & 1) ? (unsigned const char *)p_bytes : buf,
 623                               (n & 1) ? passwd_len : buf_size))
 624             goto err;
 625         if (n % 3) {
 626             if (!EVP_DigestUpdate(md2, s_bytes, salt_len))
 627                 goto err;
 628         }
 629         if (n % 7) {
 630             if (!EVP_DigestUpdate(md2, p_bytes, passwd_len))
 631                 goto err;
 632         }
 633         if (!EVP_DigestUpdate(md2,
 634                               (n & 1) ? buf : (unsigned const char *)p_bytes,
 635                               (n & 1) ? buf_size : passwd_len))
 636                 goto err;
 637         if (!EVP_DigestFinal_ex(md2, buf, NULL))
 638                 goto err;
 639     }
 640     EVP_MD_CTX_free(md2);
 641     EVP_MD_CTX_free(md);
 642     md2 = NULL;
 643     md = NULL;
 644     OPENSSL_free(p_bytes);
 645     OPENSSL_free(s_bytes);
 646     p_bytes = NULL;
 647     s_bytes = NULL;
 648
 649     cp = out_buf + strlen(out_buf);
 650     *cp++ = '$';
 651
 652 # define b64_from_24bit(B2, B1, B0, N)                                   \
 653     do {                                                                \
 654         unsigned int w = ((B2) << 16) | ((B1) << 8) | (B0);             \
 655         int i = (N);                                                    \
 656         while (i-- > 0)                                                 \
 657             {                                                           \
 658                 *cp++ = cov_2char[w & 0x3f];                            \
 659                 w >>= 6;                                                \
 660             }                                                           \
 661     } while (0)
 662
 663     switch (*magic) {
 664     case '5':
 665         b64_from_24bit (buf[0], buf[10], buf[20], 4);
 666         b64_from_24bit (buf[21], buf[1], buf[11], 4);
 667         b64_from_24bit (buf[12], buf[22], buf[2], 4);
 668         b64_from_24bit (buf[3], buf[13], buf[23], 4);
 669         b64_from_24bit (buf[24], buf[4], buf[14], 4);
 670         b64_from_24bit (buf[15], buf[25], buf[5], 4);
 671         b64_from_24bit (buf[6], buf[16], buf[26], 4);
 672         b64_from_24bit (buf[27], buf[7], buf[17], 4);
 673         b64_from_24bit (buf[18], buf[28], buf[8], 4);
 674         b64_from_24bit (buf[9], buf[19], buf[29], 4);
 675         b64_from_24bit (0, buf[31], buf[30], 3);
 676         break;
 677     case '6':
 678         b64_from_24bit (buf[0], buf[21], buf[42], 4);
 679         b64_from_24bit (buf[22], buf[43], buf[1], 4);
 680         b64_from_24bit (buf[44], buf[2], buf[23], 4);
 681         b64_from_24bit (buf[3], buf[24], buf[45], 4);
 682         b64_from_24bit (buf[25], buf[46], buf[4], 4);
 683         b64_from_24bit (buf[47], buf[5], buf[26], 4);
 684         b64_from_24bit (buf[6], buf[27], buf[48], 4);
 685         b64_from_24bit (buf[28], buf[49], buf[7], 4);
 686         b64_from_24bit (buf[50], buf[8], buf[29], 4);
 687         b64_from_24bit (buf[9], buf[30], buf[51], 4);
 688         b64_from_24bit (buf[31], buf[52], buf[10], 4);
 689         b64_from_24bit (buf[53], buf[11], buf[32], 4);
 690         b64_from_24bit (buf[12], buf[33], buf[54], 4);
 691         b64_from_24bit (buf[34], buf[55], buf[13], 4);
 692         b64_from_24bit (buf[56], buf[14], buf[35], 4);
 693         b64_from_24bit (buf[15], buf[36], buf[57], 4);
 694         b64_from_24bit (buf[37], buf[58], buf[16], 4);
 695         b64_from_24bit (buf[59], buf[17], buf[38], 4);
 696         b64_from_24bit (buf[18], buf[39], buf[60], 4);
 697         b64_from_24bit (buf[40], buf[61], buf[19], 4);
 698         b64_from_24bit (buf[62], buf[20], buf[41], 4);
 699         b64_from_24bit (0, 0, buf[63], 2);
 700         break;
 701     default:
 702         goto err;
 703     }
 704     *cp = '\0';
 705
 706     return out_buf;
 707
 708  err:
 709     EVP_MD_CTX_free(md2);
 710     EVP_MD_CTX_free(md);
 711     OPENSSL_free(p_bytes);
 712     OPENSSL_free(s_bytes);
 713     return NULL;
 714 }
 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             if (RAND_bytes((unsigned char *)*salt_p, 2) <= 0)
 732                 goto end;
 733             (*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
 734             (*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
 735             (*salt_p)[2] = 0;
 736 # ifdef CHARSET_EBCDIC
 737             ascii2ebcdic(*salt_p, *salt_p, 2); /* des_crypt will convert back
 738                                                 * to ASCII */
 739 # endif
 740         }
 741 #endif                         /* !OPENSSL_NO_DES */
 742
 743         if (mode == passwd_md5 || mode == passwd_apr1 || mode == passwd_aixmd5) {
 744             int i;
 745
 746             if (*salt_malloc_p == NULL)
 747                 *salt_p = *salt_malloc_p = app_malloc(9, "salt buffer");
 748             if (RAND_bytes((unsigned char *)*salt_p, 8) <= 0)
 749                 goto end;
 750
 751             for (i = 0; i < 8; i++)
 752                 (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 753             (*salt_p)[8] = 0;
 754         }
 755
 756         if (mode == passwd_sha256 || mode == passwd_sha512) {
 757             int i;
 758
 759             if (*salt_malloc_p == NULL)
 760                 *salt_p = *salt_malloc_p = app_malloc(17, "salt buffer");
 761             if (RAND_bytes((unsigned char *)*salt_p, 16) <= 0)
 762                 goto end;
 763
 764             for (i = 0; i < 16; i++)
 765                 (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 766             (*salt_p)[16] = 0;
 767         }
 768     }
 769
 770     assert(*salt_p != NULL);
 771
 772     /* truncate password if necessary */
 773     if ((strlen(passwd) > pw_maxlen)) {
 774         if (!quiet)
 775             /*
 776              * XXX: really we should know how to print a size_t, not cast it
 777              */
 778             BIO_printf(bio_err,
 779                        "Warning: truncating password to %u characters\n",
 780                        (unsigned)pw_maxlen);
 781         passwd[pw_maxlen] = 0;
 782     }
 783     assert(strlen(passwd) <= pw_maxlen);
 784
 785     /* now compute password hash */
 786 #ifndef OPENSSL_NO_DES
 787     if (mode == passwd_crypt)
 788         hash = DES_crypt(passwd, *salt_p);
 789 #endif
 790     if (mode == passwd_md5 || mode == passwd_apr1)
 791         hash = md5crypt(passwd, (mode == passwd_md5 ? "1" : "apr1"), *salt_p);
 792     if (mode == passwd_aixmd5)
 793         hash = md5crypt(passwd, "", *salt_p);
 794     if (mode == passwd_sha256 || mode == passwd_sha512)
 795         hash = shacrypt(passwd, (mode == passwd_sha256 ? "5" : "6"), *salt_p);
 796     assert(hash != NULL);
 797
 798     if (table && !reverse)
 799         BIO_printf(out, "%s\t%s\n", passwd, hash);
 800     else if (table && reverse)
 801         BIO_printf(out, "%s\t%s\n", hash, passwd);
 802     else
 803         BIO_printf(out, "%s\n", hash);
 804     return 1;
 805
 806  end:
 807     return 0;
 808 }