apps/passwd.c

   1 /*
   2  * Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 #include "progs.h"
  14
  15 #include <openssl/bio.h>
  16 #include <openssl/err.h>
  17 #include <openssl/evp.h>
  18 #include <openssl/rand.h>
  19 #ifndef OPENSSL_NO_DES
  20 # include <openssl/des.h>
  21 #endif
  22 #include <openssl/md5.h>
  23 #include <openssl/sha.h>
  24
  25 static unsigned const char cov_2char[64] = {
  26     /* from crypto/des/fcrypt.c */
  27     0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
  28     0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44,
  29     0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C,
  30     0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54,
  31     0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62,
  32     0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
  33     0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72,
  34     0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
  35 };
  36
  37 static const char ascii_dollar[] = { 0x24, 0x00 };
  38
  39 typedef enum {
  40     passwd_unset = 0,
  41     passwd_crypt,
  42     passwd_md5,
  43     passwd_apr1,
  44     passwd_sha256,
  45     passwd_sha512,
  46     passwd_aixmd5
  47 } passwd_modes;
  48
  49 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
  50                      char *passwd, BIO *out, int quiet, int table,
  51                      int reverse, size_t pw_maxlen, passwd_modes mode);
  52
  53 typedef enum OPTION_choice {
  54     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  55     OPT_IN,
  56     OPT_NOVERIFY, OPT_QUIET, OPT_TABLE, OPT_REVERSE, OPT_APR1,
  57     OPT_1, OPT_5, OPT_6, OPT_CRYPT, OPT_AIXMD5, OPT_SALT, OPT_STDIN,
  58     OPT_R_ENUM
  59 } OPTION_CHOICE;
  60
  61 const OPTIONS passwd_options[] = {
  62     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [password]\n"},
  63
  64     OPT_SECTION("General"),
  65     {"help", OPT_HELP, '-', "Display this summary"},
  66
  67     OPT_SECTION("Input"),
  68     {"in", OPT_IN, '<', "Read passwords from file"},
  69     {"noverify", OPT_NOVERIFY, '-',
  70      "Never verify when reading password from terminal"},
  71     {"stdin", OPT_STDIN, '-', "Read passwords from stdin"},
  72
  73     OPT_SECTION("Output"),
  74     {"quiet", OPT_QUIET, '-', "No warnings"},
  75     {"table", OPT_TABLE, '-', "Format output as table"},
  76     {"reverse", OPT_REVERSE, '-', "Switch table columns"},
  77
  78     OPT_SECTION("Cryptographic"),
  79     {"salt", OPT_SALT, 's', "Use provided salt"},
  80     {"6", OPT_6, '-', "SHA512-based password algorithm"},
  81     {"5", OPT_5, '-', "SHA256-based password algorithm"},
  82     {"apr1", OPT_APR1, '-', "MD5-based password algorithm, Apache variant"},
  83     {"1", OPT_1, '-', "MD5-based password algorithm"},
  84     {"aixmd5", OPT_AIXMD5, '-', "AIX MD5-based password algorithm"},
  85 #ifndef OPENSSL_NO_DES
  86     {"crypt", OPT_CRYPT, '-', "Standard Unix password algorithm (default)"},
  87 #endif
  88
  89     OPT_R_OPTIONS,
  90
  91     OPT_PARAMETERS(),
  92     {"password", 0, 0, "Password text to digest (optional)"},
  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_CONSOLE
 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_CONSOLE
 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 #ifndef OPENSSL_NO_DES
 172             if (mode != passwd_unset)
 173                 goto opthelp;
 174             mode = passwd_crypt;
 175 #endif
 176             break;
 177         case OPT_SALT:
 178             passed_salt = 1;
 179             salt = opt_arg();
 180             break;
 181         case OPT_STDIN:
 182             if (pw_source_defined)
 183                 goto opthelp;
 184             in_stdin = 1;
 185             pw_source_defined = 1;
 186             break;
 187         case OPT_R_CASES:
 188             if (!opt_rand(o))
 189                 goto end;
 190             break;
 191         }
 192     }
 193     argc = opt_num_rest();
 194     argv = opt_rest();
 195
 196     if (*argv != NULL) {
 197         if (pw_source_defined)
 198             goto opthelp;
 199         pw_source_defined = 1;
 200         passwds = argv;
 201     }
 202
 203     if (mode == passwd_unset) {
 204         /* use default */
 205         mode = passwd_crypt;
 206     }
 207
 208 #ifdef OPENSSL_NO_DES
 209     if (mode == passwd_crypt)
 210         goto opthelp;
 211 #endif
 212
 213     if (infile != NULL && in_stdin) {
 214         BIO_printf(bio_err, "%s: Can't combine -in and -stdin\n", prog);
 215         goto end;
 216     }
 217
 218     if (infile != NULL || in_stdin) {
 219         /*
 220          * If in_stdin is true, we know that infile is NULL, and that
 221          * bio_open_default() will give us back an alias for stdin.
 222          */
 223         in = bio_open_default(infile, 'r', FORMAT_TEXT);
 224         if (in == NULL)
 225             goto end;
 226     }
 227
 228     if (mode == passwd_crypt)
 229         pw_maxlen = 8;
 230
 231     if (passwds == NULL) {
 232         /* no passwords on the command line */
 233
 234         passwd_malloc_size = pw_maxlen + 2;
 235         /* longer than necessary so that we can warn about truncation */
 236         passwd = passwd_malloc =
 237             app_malloc(passwd_malloc_size, "password buffer");
 238     }
 239
 240     if ((in == NULL) && (passwds == NULL)) {
 241         /*
 242          * we use the following method to make sure what
 243          * in the 'else' section is always compiled, to
 244          * avoid rot of not-frequently-used code.
 245          */
 246         if (1) {
 247 #ifndef OPENSSL_NO_UI_CONSOLE
 248             /* build a null-terminated list */
 249             static char *passwds_static[2] = { NULL, NULL };
 250
 251             passwds = passwds_static;
 252             if (in == NULL) {
 253                 if (EVP_read_pw_string
 254                     (passwd_malloc, passwd_malloc_size, "Password: ",
 255                      !(passed_salt || in_noverify)) != 0)
 256                     goto end;
 257             }
 258             passwds[0] = passwd_malloc;
 259         } else {
 260 #endif
 261             BIO_printf(bio_err, "password required\n");
 262             goto end;
 263         }
 264     }
 265
 266     if (in == NULL) {
 267         assert(passwds != NULL);
 268         assert(*passwds != NULL);
 269
 270         do {                    /* loop over list of passwords */
 271             passwd = *passwds++;
 272             if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, bio_out,
 273                            quiet, table, reverse, pw_maxlen, mode))
 274                 goto end;
 275         } while (*passwds != NULL);
 276     } else {
 277         /* in != NULL */
 278         int done;
 279
 280         assert(passwd != NULL);
 281         do {
 282             int r = BIO_gets(in, passwd, pw_maxlen + 1);
 283             if (r > 0) {
 284                 char *c = (strchr(passwd, '\n'));
 285                 if (c != NULL) {
 286                     *c = 0;     /* truncate at newline */
 287                 } else {
 288                     /* ignore rest of line */
 289                     char trash[BUFSIZ];
 290                     do
 291                         r = BIO_gets(in, trash, sizeof(trash));
 292                     while ((r > 0) && (!strchr(trash, '\n')));
 293                 }
 294
 295                 if (!do_passwd
 296                     (passed_salt, &salt, &salt_malloc, passwd, bio_out, quiet,
 297                      table, reverse, pw_maxlen, mode))
 298                     goto end;
 299             }
 300             done = (r <= 0);
 301         } while (!done);
 302     }
 303     ret = 0;
 304
 305  end:
 306 #if 0
 307     ERR_print_errors(bio_err);
 308 #endif
 309     OPENSSL_free(salt_malloc);
 310     OPENSSL_free(passwd_malloc);
 311     BIO_free(in);
 312     return ret;
 313 }
 314
 315 /*
 316  * MD5-based password algorithm (should probably be available as a library
 317  * function; then the static buffer would not be acceptable). For magic
 318  * string "1", this should be compatible to the MD5-based BSD password
 319  * algorithm. For 'magic' string "apr1", this is compatible to the MD5-based
 320  * Apache password algorithm. (Apparently, the Apache password algorithm is
 321  * identical except that the 'magic' string was changed -- the laziest
 322  * application of the NIH principle I've ever encountered.)
 323  */
 324 static char *md5crypt(const char *passwd, const char *magic, const char *salt)
 325 {
 326     /* "$apr1$..salt..$.......md5hash..........\0" */
 327     static char out_buf[6 + 9 + 24 + 2];
 328     unsigned char buf[MD5_DIGEST_LENGTH];
 329     char ascii_magic[5];         /* "apr1" plus '\0' */
 330     char ascii_salt[9];          /* Max 8 chars plus '\0' */
 331     char *ascii_passwd = NULL;
 332     char *salt_out;
 333     int n;
 334     unsigned int i;
 335     EVP_MD_CTX *md = NULL, *md2 = NULL;
 336     size_t passwd_len, salt_len, magic_len;
 337
 338     passwd_len = strlen(passwd);
 339
 340     out_buf[0] = 0;
 341     magic_len = strlen(magic);
 342     OPENSSL_strlcpy(ascii_magic, magic, sizeof(ascii_magic));
 343 #ifdef CHARSET_EBCDIC
 344     if ((magic[0] & 0x80) != 0)    /* High bit is 1 in EBCDIC alnums */
 345         ebcdic2ascii(ascii_magic, ascii_magic, magic_len);
 346 #endif
 347
 348     /* The salt gets truncated to 8 chars */
 349     OPENSSL_strlcpy(ascii_salt, salt, sizeof(ascii_salt));
 350     salt_len = strlen(ascii_salt);
 351 #ifdef CHARSET_EBCDIC
 352     ebcdic2ascii(ascii_salt, ascii_salt, salt_len);
 353 #endif
 354
 355 #ifdef CHARSET_EBCDIC
 356     ascii_passwd = OPENSSL_strdup(passwd);
 357     if (ascii_passwd == NULL)
 358         return NULL;
 359     ebcdic2ascii(ascii_passwd, ascii_passwd, passwd_len);
 360     passwd = ascii_passwd;
 361 #endif
 362
 363     if (magic_len > 0) {
 364         OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));
 365
 366         if (magic_len > 4)    /* assert it's  "1" or "apr1" */
 367             goto err;
 368
 369         OPENSSL_strlcat(out_buf, ascii_magic, sizeof(out_buf));
 370         OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));
 371     }
 372
 373     OPENSSL_strlcat(out_buf, ascii_salt, sizeof(out_buf));
 374
 375     if (strlen(out_buf) > 6 + 8) /* assert "$apr1$..salt.." */
 376         goto err;
 377
 378     salt_out = out_buf;
 379     if (magic_len > 0)
 380         salt_out += 2 + magic_len;
 381
 382     if (salt_len > 8)
 383         goto err;
 384
 385     md = EVP_MD_CTX_new();
 386     if (md == NULL
 387         || !EVP_DigestInit_ex(md, EVP_md5(), NULL)
 388         || !EVP_DigestUpdate(md, passwd, passwd_len))
 389         goto err;
 390
 391     if (magic_len > 0)
 392         if (!EVP_DigestUpdate(md, ascii_dollar, 1)
 393             || !EVP_DigestUpdate(md, ascii_magic, magic_len)
 394             || !EVP_DigestUpdate(md, ascii_dollar, 1))
 395           goto err;
 396
 397     if (!EVP_DigestUpdate(md, ascii_salt, salt_len))
 398         goto err;
 399
 400     md2 = EVP_MD_CTX_new();
 401     if (md2 == NULL
 402         || !EVP_DigestInit_ex(md2, EVP_md5(), NULL)
 403         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 404         || !EVP_DigestUpdate(md2, ascii_salt, salt_len)
 405         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 406         || !EVP_DigestFinal_ex(md2, buf, NULL))
 407         goto err;
 408
 409     for (i = passwd_len; i > sizeof(buf); i -= sizeof(buf)) {
 410         if (!EVP_DigestUpdate(md, buf, sizeof(buf)))
 411             goto err;
 412     }
 413     if (!EVP_DigestUpdate(md, buf, i))
 414         goto err;
 415
 416     n = passwd_len;
 417     while (n) {
 418         if (!EVP_DigestUpdate(md, (n & 1) ? "\0" : passwd, 1))
 419             goto err;
 420         n >>= 1;
 421     }
 422     if (!EVP_DigestFinal_ex(md, buf, NULL))
 423         return NULL;
 424
 425     for (i = 0; i < 1000; i++) {
 426         if (!EVP_DigestInit_ex(md2, EVP_md5(), NULL))
 427             goto err;
 428         if (!EVP_DigestUpdate(md2,
 429                               (i & 1) ? (unsigned const char *)passwd : buf,
 430                               (i & 1) ? passwd_len : sizeof(buf)))
 431             goto err;
 432         if (i % 3) {
 433             if (!EVP_DigestUpdate(md2, ascii_salt, salt_len))
 434                 goto err;
 435         }
 436         if (i % 7) {
 437             if (!EVP_DigestUpdate(md2, passwd, passwd_len))
 438                 goto err;
 439         }
 440         if (!EVP_DigestUpdate(md2,
 441                               (i & 1) ? buf : (unsigned const char *)passwd,
 442                               (i & 1) ? sizeof(buf) : passwd_len))
 443                 goto err;
 444         if (!EVP_DigestFinal_ex(md2, buf, NULL))
 445                 goto err;
 446     }
 447     EVP_MD_CTX_free(md2);
 448     EVP_MD_CTX_free(md);
 449     md2 = NULL;
 450     md = NULL;
 451
 452     {
 453         /* transform buf into output string */
 454         unsigned char buf_perm[sizeof(buf)];
 455         int dest, source;
 456         char *output;
 457
 458         /* silly output permutation */
 459         for (dest = 0, source = 0; dest < 14;
 460              dest++, source = (source + 6) % 17)
 461             buf_perm[dest] = buf[source];
 462         buf_perm[14] = buf[5];
 463         buf_perm[15] = buf[11];
 464 # ifndef PEDANTIC              /* Unfortunately, this generates a "no
 465                                  * effect" warning */
 466         assert(16 == sizeof(buf_perm));
 467 # endif
 468
 469         output = salt_out + salt_len;
 470         assert(output == out_buf + strlen(out_buf));
 471
 472         *output++ = ascii_dollar[0];
 473
 474         for (i = 0; i < 15; i += 3) {
 475             *output++ = cov_2char[buf_perm[i + 2] & 0x3f];
 476             *output++ = cov_2char[((buf_perm[i + 1] & 0xf) << 2) |
 477                                   (buf_perm[i + 2] >> 6)];
 478             *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
 479                                   (buf_perm[i + 1] >> 4)];
 480             *output++ = cov_2char[buf_perm[i] >> 2];
 481         }
 482         assert(i == 15);
 483         *output++ = cov_2char[buf_perm[i] & 0x3f];
 484         *output++ = cov_2char[buf_perm[i] >> 6];
 485         *output = 0;
 486         assert(strlen(out_buf) < sizeof(out_buf));
 487 #ifdef CHARSET_EBCDIC
 488         ascii2ebcdic(out_buf, out_buf, strlen(out_buf));
 489 #endif
 490     }
 491
 492     return out_buf;
 493
 494  err:
 495     OPENSSL_free(ascii_passwd);
 496     EVP_MD_CTX_free(md2);
 497     EVP_MD_CTX_free(md);
 498     return NULL;
 499 }
 500
 501 /*
 502  * SHA based password algorithm, describe by Ulrich Drepper here:
 503  * https://www.akkadia.org/drepper/SHA-crypt.txt
 504  * (note that it's in the public domain)
 505  */
 506 static char *shacrypt(const char *passwd, const char *magic, const char *salt)
 507 {
 508     /* Prefix for optional rounds specification.  */
 509     static const char rounds_prefix[] = "rounds=";
 510     /* Maximum salt string length.  */
 511 # define SALT_LEN_MAX 16
 512     /* Default number of rounds if not explicitly specified.  */
 513 # define ROUNDS_DEFAULT 5000
 514     /* Minimum number of rounds.  */
 515 # define ROUNDS_MIN 1000
 516     /* Maximum number of rounds.  */
 517 # define ROUNDS_MAX 999999999
 518
 519     /* "$6$rounds=<N>$......salt......$...shahash(up to 86 chars)...\0" */
 520     static char out_buf[3 + 17 + 17 + 86 + 1];
 521     unsigned char buf[SHA512_DIGEST_LENGTH];
 522     unsigned char temp_buf[SHA512_DIGEST_LENGTH];
 523     size_t buf_size = 0;
 524     char ascii_magic[2];
 525     char ascii_salt[17];          /* Max 16 chars plus '\0' */
 526     char *ascii_passwd = NULL;
 527     size_t n;
 528     EVP_MD_CTX *md = NULL, *md2 = NULL;
 529     const EVP_MD *sha = NULL;
 530     size_t passwd_len, salt_len, magic_len;
 531     unsigned int rounds = 5000;        /* Default */
 532     char rounds_custom = 0;
 533     char *p_bytes = NULL;
 534     char *s_bytes = NULL;
 535     char *cp = NULL;
 536
 537     passwd_len = strlen(passwd);
 538     magic_len = strlen(magic);
 539
 540     /* assert it's "5" or "6" */
 541     if (magic_len != 1)
 542         return NULL;
 543
 544     switch (magic[0]) {
 545     case '5':
 546         sha = EVP_sha256();
 547         buf_size = 32;
 548         break;
 549     case '6':
 550         sha = EVP_sha512();
 551         buf_size = 64;
 552         break;
 553     default:
 554         return NULL;
 555     }
 556
 557     if (strncmp(salt, rounds_prefix, sizeof(rounds_prefix) - 1) == 0) {
 558         const char *num = salt + sizeof(rounds_prefix) - 1;
 559         char *endp;
 560         unsigned long int srounds = strtoul (num, &endp, 10);
 561         if (*endp == '$') {
 562             salt = endp + 1;
 563             if (srounds > ROUNDS_MAX)
 564                 rounds = ROUNDS_MAX;
 565             else if (srounds < ROUNDS_MIN)
 566                 rounds = ROUNDS_MIN;
 567             else
 568                 rounds = (unsigned int)srounds;
 569             rounds_custom = 1;
 570         } else {
 571             return NULL;
 572         }
 573     }
 574
 575     OPENSSL_strlcpy(ascii_magic, magic, sizeof(ascii_magic));
 576 #ifdef CHARSET_EBCDIC
 577     if ((magic[0] & 0x80) != 0)    /* High bit is 1 in EBCDIC alnums */
 578         ebcdic2ascii(ascii_magic, ascii_magic, magic_len);
 579 #endif
 580
 581     /* The salt gets truncated to 16 chars */
 582     OPENSSL_strlcpy(ascii_salt, salt, sizeof(ascii_salt));
 583     salt_len = strlen(ascii_salt);
 584 #ifdef CHARSET_EBCDIC
 585     ebcdic2ascii(ascii_salt, ascii_salt, salt_len);
 586 #endif
 587
 588 #ifdef CHARSET_EBCDIC
 589     ascii_passwd = OPENSSL_strdup(passwd);
 590     if (ascii_passwd == NULL)
 591         return NULL;
 592     ebcdic2ascii(ascii_passwd, ascii_passwd, passwd_len);
 593     passwd = ascii_passwd;
 594 #endif
 595
 596     out_buf[0] = 0;
 597     OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));
 598     OPENSSL_strlcat(out_buf, ascii_magic, sizeof(out_buf));
 599     OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));
 600     if (rounds_custom) {
 601         char tmp_buf[80]; /* "rounds=999999999" */
 602         sprintf(tmp_buf, "rounds=%u", rounds);
 603 #ifdef CHARSET_EBCDIC
 604         /* In case we're really on a ASCII based platform and just pretend */
 605         if (tmp_buf[0] != 0x72)  /* ASCII 'r' */
 606             ebcdic2ascii(tmp_buf, tmp_buf, strlen(tmp_buf));
 607 #endif
 608         OPENSSL_strlcat(out_buf, tmp_buf, sizeof(out_buf));
 609         OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));
 610     }
 611     OPENSSL_strlcat(out_buf, ascii_salt, sizeof(out_buf));
 612
 613     /* assert "$5$rounds=999999999$......salt......" */
 614     if (strlen(out_buf) > 3 + 17 * rounds_custom + salt_len )
 615         goto err;
 616
 617     md = EVP_MD_CTX_new();
 618     if (md == NULL
 619         || !EVP_DigestInit_ex(md, sha, NULL)
 620         || !EVP_DigestUpdate(md, passwd, passwd_len)
 621         || !EVP_DigestUpdate(md, ascii_salt, salt_len))
 622         goto err;
 623
 624     md2 = EVP_MD_CTX_new();
 625     if (md2 == NULL
 626         || !EVP_DigestInit_ex(md2, sha, NULL)
 627         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 628         || !EVP_DigestUpdate(md2, ascii_salt, salt_len)
 629         || !EVP_DigestUpdate(md2, passwd, passwd_len)
 630         || !EVP_DigestFinal_ex(md2, buf, NULL))
 631         goto err;
 632
 633     for (n = passwd_len; n > buf_size; n -= buf_size) {
 634         if (!EVP_DigestUpdate(md, buf, buf_size))
 635             goto err;
 636     }
 637     if (!EVP_DigestUpdate(md, buf, n))
 638         goto err;
 639
 640     n = passwd_len;
 641     while (n) {
 642         if (!EVP_DigestUpdate(md,
 643                               (n & 1) ? buf : (unsigned const char *)passwd,
 644                               (n & 1) ? buf_size : passwd_len))
 645             goto err;
 646         n >>= 1;
 647     }
 648     if (!EVP_DigestFinal_ex(md, buf, NULL))
 649         return NULL;
 650
 651     /* P sequence */
 652     if (!EVP_DigestInit_ex(md2, sha, NULL))
 653         goto err;
 654
 655     for (n = passwd_len; n > 0; n--)
 656         if (!EVP_DigestUpdate(md2, passwd, passwd_len))
 657             goto err;
 658
 659     if (!EVP_DigestFinal_ex(md2, temp_buf, NULL))
 660         return NULL;
 661
 662     if ((p_bytes = OPENSSL_zalloc(passwd_len)) == NULL)
 663         goto err;
 664     for (cp = p_bytes, n = passwd_len; n > buf_size; n -= buf_size, cp += buf_size)
 665         memcpy(cp, temp_buf, buf_size);
 666     memcpy(cp, temp_buf, n);
 667
 668     /* S sequence */
 669     if (!EVP_DigestInit_ex(md2, sha, NULL))
 670         goto err;
 671
 672     for (n = 16 + buf[0]; n > 0; n--)
 673         if (!EVP_DigestUpdate(md2, ascii_salt, salt_len))
 674             goto err;
 675
 676     if (!EVP_DigestFinal_ex(md2, temp_buf, NULL))
 677         return NULL;
 678
 679     if ((s_bytes = OPENSSL_zalloc(salt_len)) == NULL)
 680         goto err;
 681     for (cp = s_bytes, n = salt_len; n > buf_size; n -= buf_size, cp += buf_size)
 682         memcpy(cp, temp_buf, buf_size);
 683     memcpy(cp, temp_buf, n);
 684
 685     for (n = 0; n < rounds; n++) {
 686         if (!EVP_DigestInit_ex(md2, sha, NULL))
 687             goto err;
 688         if (!EVP_DigestUpdate(md2,
 689                               (n & 1) ? (unsigned const char *)p_bytes : buf,
 690                               (n & 1) ? passwd_len : buf_size))
 691             goto err;
 692         if (n % 3) {
 693             if (!EVP_DigestUpdate(md2, s_bytes, salt_len))
 694                 goto err;
 695         }
 696         if (n % 7) {
 697             if (!EVP_DigestUpdate(md2, p_bytes, passwd_len))
 698                 goto err;
 699         }
 700         if (!EVP_DigestUpdate(md2,
 701                               (n & 1) ? buf : (unsigned const char *)p_bytes,
 702                               (n & 1) ? buf_size : passwd_len))
 703                 goto err;
 704         if (!EVP_DigestFinal_ex(md2, buf, NULL))
 705                 goto err;
 706     }
 707     EVP_MD_CTX_free(md2);
 708     EVP_MD_CTX_free(md);
 709     md2 = NULL;
 710     md = NULL;
 711     OPENSSL_free(p_bytes);
 712     OPENSSL_free(s_bytes);
 713     p_bytes = NULL;
 714     s_bytes = NULL;
 715
 716     cp = out_buf + strlen(out_buf);
 717     *cp++ = ascii_dollar[0];
 718
 719 # define b64_from_24bit(B2, B1, B0, N)                                   \
 720     do {                                                                \
 721         unsigned int w = ((B2) << 16) | ((B1) << 8) | (B0);             \
 722         int i = (N);                                                    \
 723         while (i-- > 0)                                                 \
 724             {                                                           \
 725                 *cp++ = cov_2char[w & 0x3f];                            \
 726                 w >>= 6;                                                \
 727             }                                                           \
 728     } while (0)
 729
 730     switch (magic[0]) {
 731     case '5':
 732         b64_from_24bit (buf[0], buf[10], buf[20], 4);
 733         b64_from_24bit (buf[21], buf[1], buf[11], 4);
 734         b64_from_24bit (buf[12], buf[22], buf[2], 4);
 735         b64_from_24bit (buf[3], buf[13], buf[23], 4);
 736         b64_from_24bit (buf[24], buf[4], buf[14], 4);
 737         b64_from_24bit (buf[15], buf[25], buf[5], 4);
 738         b64_from_24bit (buf[6], buf[16], buf[26], 4);
 739         b64_from_24bit (buf[27], buf[7], buf[17], 4);
 740         b64_from_24bit (buf[18], buf[28], buf[8], 4);
 741         b64_from_24bit (buf[9], buf[19], buf[29], 4);
 742         b64_from_24bit (0, buf[31], buf[30], 3);
 743         break;
 744     case '6':
 745         b64_from_24bit (buf[0], buf[21], buf[42], 4);
 746         b64_from_24bit (buf[22], buf[43], buf[1], 4);
 747         b64_from_24bit (buf[44], buf[2], buf[23], 4);
 748         b64_from_24bit (buf[3], buf[24], buf[45], 4);
 749         b64_from_24bit (buf[25], buf[46], buf[4], 4);
 750         b64_from_24bit (buf[47], buf[5], buf[26], 4);
 751         b64_from_24bit (buf[6], buf[27], buf[48], 4);
 752         b64_from_24bit (buf[28], buf[49], buf[7], 4);
 753         b64_from_24bit (buf[50], buf[8], buf[29], 4);
 754         b64_from_24bit (buf[9], buf[30], buf[51], 4);
 755         b64_from_24bit (buf[31], buf[52], buf[10], 4);
 756         b64_from_24bit (buf[53], buf[11], buf[32], 4);
 757         b64_from_24bit (buf[12], buf[33], buf[54], 4);
 758         b64_from_24bit (buf[34], buf[55], buf[13], 4);
 759         b64_from_24bit (buf[56], buf[14], buf[35], 4);
 760         b64_from_24bit (buf[15], buf[36], buf[57], 4);
 761         b64_from_24bit (buf[37], buf[58], buf[16], 4);
 762         b64_from_24bit (buf[59], buf[17], buf[38], 4);
 763         b64_from_24bit (buf[18], buf[39], buf[60], 4);
 764         b64_from_24bit (buf[40], buf[61], buf[19], 4);
 765         b64_from_24bit (buf[62], buf[20], buf[41], 4);
 766         b64_from_24bit (0, 0, buf[63], 2);
 767         break;
 768     default:
 769         goto err;
 770     }
 771     *cp = '\0';
 772 #ifdef CHARSET_EBCDIC
 773     ascii2ebcdic(out_buf, out_buf, strlen(out_buf));
 774 #endif
 775
 776     return out_buf;
 777
 778  err:
 779     EVP_MD_CTX_free(md2);
 780     EVP_MD_CTX_free(md);
 781     OPENSSL_free(p_bytes);
 782     OPENSSL_free(s_bytes);
 783     OPENSSL_free(ascii_passwd);
 784     return NULL;
 785 }
 786
 787 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
 788                      char *passwd, BIO *out, int quiet, int table,
 789                      int reverse, size_t pw_maxlen, passwd_modes mode)
 790 {
 791     char *hash = NULL;
 792
 793     assert(salt_p != NULL);
 794     assert(salt_malloc_p != NULL);
 795
 796     /* first make sure we have a salt */
 797     if (!passed_salt) {
 798         size_t saltlen = 0;
 799         size_t i;
 800
 801 #ifndef OPENSSL_NO_DES
 802         if (mode == passwd_crypt)
 803             saltlen = 2;
 804 #endif                         /* !OPENSSL_NO_DES */
 805
 806         if (mode == passwd_md5 || mode == passwd_apr1 || mode == passwd_aixmd5)
 807             saltlen = 8;
 808
 809         if (mode == passwd_sha256 || mode == passwd_sha512)
 810             saltlen = 16;
 811
 812         assert(saltlen != 0);
 813
 814         if (*salt_malloc_p == NULL)
 815             *salt_p = *salt_malloc_p = app_malloc(saltlen + 1, "salt buffer");
 816         if (RAND_bytes((unsigned char *)*salt_p, saltlen) <= 0)
 817             goto end;
 818
 819         for (i = 0; i < saltlen; i++)
 820             (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 821         (*salt_p)[i] = 0;
 822 # ifdef CHARSET_EBCDIC
 823         /* The password encryption function will convert back to ASCII */
 824         ascii2ebcdic(*salt_p, *salt_p, saltlen);
 825 # endif
 826     }
 827
 828     assert(*salt_p != NULL);
 829
 830     /* truncate password if necessary */
 831     if ((strlen(passwd) > pw_maxlen)) {
 832         if (!quiet)
 833             /*
 834              * XXX: really we should know how to print a size_t, not cast it
 835              */
 836             BIO_printf(bio_err,
 837                        "Warning: truncating password to %u characters\n",
 838                        (unsigned)pw_maxlen);
 839         passwd[pw_maxlen] = 0;
 840     }
 841     assert(strlen(passwd) <= pw_maxlen);
 842
 843     /* now compute password hash */
 844 #ifndef OPENSSL_NO_DES
 845     if (mode == passwd_crypt)
 846         hash = DES_crypt(passwd, *salt_p);
 847 #endif
 848     if (mode == passwd_md5 || mode == passwd_apr1)
 849         hash = md5crypt(passwd, (mode == passwd_md5 ? "1" : "apr1"), *salt_p);
 850     if (mode == passwd_aixmd5)
 851         hash = md5crypt(passwd, "", *salt_p);
 852     if (mode == passwd_sha256 || mode == passwd_sha512)
 853         hash = shacrypt(passwd, (mode == passwd_sha256 ? "5" : "6"), *salt_p);
 854     assert(hash != NULL);
 855
 856     if (table && !reverse)
 857         BIO_printf(out, "%s\t%s\n", passwd, hash);
 858     else if (table && reverse)
 859         BIO_printf(out, "%s\t%s\n", hash, passwd);
 860     else
 861         BIO_printf(out, "%s\n", hash);
 862     return 1;
 863
 864  end:
 865     return 0;
 866 }