apps/passwd.c

   1 /* ====================================================================
   2  * Copyright (c) 2000-2015 The OpenSSL Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  *
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in
  13  *    the documentation and/or other materials provided with the
  14  *    distribution.
  15  *
  16  * 3. All advertising materials mentioning features or use of this
  17  *    software must display the following acknowledgment:
  18  *    "This product includes software developed by the OpenSSL Project
  19  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  20  *
  21  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  22  *    endorse or promote products derived from this software without
  23  *    prior written permission. For written permission, please contact
  24  *    licensing@OpenSSL.org.
  25  *
  26  * 5. Products derived from this software may not be called "OpenSSL"
  27  *    nor may "OpenSSL" appear in their names without prior written
  28  *    permission of the OpenSSL Project.
  29  *
  30  * 6. Redistributions of any form whatsoever must retain the following
  31  *    acknowledgment:
  32  *    "This product includes software developed by the OpenSSL Project
  33  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  36  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  38  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  41  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  42  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  44  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  45  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  46  * OF THE POSSIBILITY OF SUCH DAMAGE.
  47  * ====================================================================
  48  */
  49
  50 #if defined OPENSSL_NO_MD5 || defined CHARSET_EBCDIC
  51 # define NO_MD5CRYPT_1
  52 #endif
  53
  54 #if !defined(OPENSSL_NO_DES) || !defined(NO_MD5CRYPT_1)
  55
  56 # include <assert.h>
  57 # include <string.h>
  58
  59 # include "apps.h"
  60
  61 # include <openssl/bio.h>
  62 # include <openssl/err.h>
  63 # include <openssl/evp.h>
  64 # include <openssl/rand.h>
  65 # ifndef OPENSSL_NO_DES
  66 #  include <openssl/des.h>
  67 # endif
  68 # ifndef NO_MD5CRYPT_1
  69 #  include <openssl/md5.h>
  70 # endif
  71
  72 static unsigned const char cov_2char[64] = {
  73     /* from crypto/des/fcrypt.c */
  74     0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
  75     0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44,
  76     0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C,
  77     0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54,
  78     0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62,
  79     0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
  80     0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72,
  81     0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
  82 };
  83
  84 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
  85                      char *passwd, BIO *out, int quiet, int table,
  86                      int reverse, size_t pw_maxlen, int usecrypt, int use1,
  87                      int useapr1);
  88
  89 typedef enum OPTION_choice {
  90     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  91     OPT_IN,
  92     OPT_NOVERIFY, OPT_QUIET, OPT_TABLE, OPT_REVERSE, OPT_APR1,
  93     OPT_1, OPT_CRYPT, OPT_SALT, OPT_STDIN
  94 } OPTION_CHOICE;
  95
  96 OPTIONS passwd_options[] = {
  97     {"help", OPT_HELP, '-', "Display this summary"},
  98     {"in", OPT_IN, '<', "Pead passwords from file"},
  99     {"noverify", OPT_NOVERIFY, '-',
 100      "Never verify when reading password from terminal"},
 101     {"quiet", OPT_QUIET, '-', "No warnings"},
 102     {"table", OPT_TABLE, '-', "Format output as table"},
 103     {"reverse", OPT_REVERSE, '-', "Switch table columns"},
 104 # ifndef NO_MD5CRYPT_1
 105     {"apr1", OPT_APR1, '-', "MD5-based password algorithm, Apache variant"},
 106     {"1", OPT_1, '-', "MD5-based password algorithm"},
 107 # endif
 108 # ifndef OPENSSL_NO_DES
 109     {"crypt", OPT_CRYPT, '-', "Standard Unix password algorithm (default)"},
 110 # endif
 111     {"salt", OPT_SALT, 's', "Use provided salt"},
 112     {"stdin", OPT_STDIN, '-', "Read passwords from stdin"},
 113     {NULL}
 114 };
 115
 116 int passwd_main(int argc, char **argv)
 117 {
 118     BIO *in = NULL;
 119     char *infile = NULL, *salt = NULL, *passwd = NULL, **passwds = NULL;
 120     char *salt_malloc = NULL, *passwd_malloc = NULL, *prog;
 121     OPTION_CHOICE o;
 122     int in_stdin = 0, in_noverify = 0, pw_source_defined = 0;
 123     int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
 124     int ret = 1, usecrypt = 0, use1 = 0, useapr1 = 0;
 125     size_t passwd_malloc_size = 0, pw_maxlen = 256;
 126
 127     prog = opt_init(argc, argv, passwd_options);
 128     while ((o = opt_next()) != OPT_EOF) {
 129         switch (o) {
 130         case OPT_EOF:
 131         case OPT_ERR:
 132  opthelp:
 133             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 134             goto end;
 135         case OPT_HELP:
 136             opt_help(passwd_options);
 137             ret = 0;
 138             goto end;
 139         case OPT_IN:
 140             if (pw_source_defined)
 141                 goto opthelp;
 142             infile = opt_arg();
 143             pw_source_defined = 1;
 144             break;
 145         case OPT_NOVERIFY:
 146             in_noverify = 1;
 147             break;
 148         case OPT_QUIET:
 149             quiet = 1;
 150             break;
 151         case OPT_TABLE:
 152             table = 1;
 153             break;
 154         case OPT_REVERSE:
 155             reverse = 1;
 156             break;
 157         case OPT_1:
 158             use1 = 1;
 159             break;
 160         case OPT_APR1:
 161             useapr1 = 1;
 162             break;
 163         case OPT_CRYPT:
 164             usecrypt = 1;
 165             break;
 166         case OPT_SALT:
 167             passed_salt = 1;
 168             salt = opt_arg();
 169             break;
 170         case OPT_STDIN:
 171             if (pw_source_defined)
 172                 goto opthelp;
 173             in_stdin = 1;
 174             break;
 175         }
 176     }
 177     argc = opt_num_rest();
 178     argv = opt_rest();
 179
 180     if (*argv) {
 181         if (pw_source_defined)
 182             goto opthelp;
 183         pw_source_defined = 1;
 184         passwds = argv;
 185     }
 186
 187     if (!usecrypt && !use1 && !useapr1) {
 188         /* use default */
 189         usecrypt = 1;
 190     }
 191     if (usecrypt + use1 + useapr1 > 1) {
 192         /* conflict */
 193         goto opthelp;
 194     }
 195
 196 # ifdef OPENSSL_NO_DES
 197     if (usecrypt)
 198         goto opthelp;
 199 # endif
 200 # ifdef NO_MD5CRYPT_1
 201     if (use1 || useapr1)
 202         goto opthelp;
 203 # endif
 204
 205     if (infile && in_stdin) {
 206         BIO_printf(bio_err, "%s: Can't combine -in and -stdin\n", prog);
 207         goto end;
 208     }
 209
 210     in = bio_open_default(infile, "r");
 211     if (in == NULL)
 212         goto end;
 213
 214     if (usecrypt)
 215         pw_maxlen = 8;
 216     else if (use1 || useapr1)
 217         pw_maxlen = 256;        /* arbitrary limit, should be enough for most
 218                                  * passwords */
 219
 220     if (passwds == NULL) {
 221         /* no passwords on the command line */
 222
 223         passwd_malloc_size = pw_maxlen + 2;
 224         /* longer than necessary so that we can warn about truncation */
 225         passwd = passwd_malloc =
 226             app_malloc(passwd_malloc_size, "password buffer");
 227     }
 228
 229     if ((in == NULL) && (passwds == NULL)) {
 230         /* build a null-terminated list */
 231         static char *passwds_static[2] = { NULL, NULL };
 232
 233         passwds = passwds_static;
 234         if (in == NULL)
 235             if (EVP_read_pw_string
 236                 (passwd_malloc, passwd_malloc_size, "Password: ",
 237                  !(passed_salt || in_noverify)) != 0)
 238                 goto end;
 239         passwds[0] = passwd_malloc;
 240     }
 241
 242     if (in == NULL) {
 243         assert(passwds != NULL);
 244         assert(*passwds != NULL);
 245
 246         do {                    /* loop over list of passwords */
 247             passwd = *passwds++;
 248             if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, bio_out,
 249                            quiet, table, reverse, pw_maxlen, usecrypt, use1,
 250                            useapr1))
 251                 goto end;
 252         }
 253         while (*passwds != NULL);
 254     } else
 255         /* in != NULL */
 256     {
 257         int done;
 258
 259         assert(passwd != NULL);
 260         do {
 261             int r = BIO_gets(in, passwd, pw_maxlen + 1);
 262             if (r > 0) {
 263                 char *c = (strchr(passwd, '\n'));
 264                 if (c != NULL)
 265                     *c = 0;     /* truncate at newline */
 266                 else {
 267                     /* ignore rest of line */
 268                     char trash[BUFSIZ];
 269                     do
 270                         r = BIO_gets(in, trash, sizeof trash);
 271                     while ((r > 0) && (!strchr(trash, '\n')));
 272                 }
 273
 274                 if (!do_passwd
 275                     (passed_salt, &salt, &salt_malloc, passwd, bio_out, quiet,
 276                      table, reverse, pw_maxlen, usecrypt, use1, useapr1))
 277                     goto end;
 278             }
 279             done = (r <= 0);
 280         }
 281         while (!done);
 282     }
 283     ret = 0;
 284
 285  end:
 286     ERR_print_errors(bio_err);
 287     if (salt_malloc)
 288         OPENSSL_free(salt_malloc);
 289     if (passwd_malloc)
 290         OPENSSL_free(passwd_malloc);
 291     BIO_free(in);
 292     return (ret);
 293 }
 294
 295 # ifndef NO_MD5CRYPT_1
 296 /*
 297  * MD5-based password algorithm (should probably be available as a library
 298  * function; then the static buffer would not be acceptable). For magic
 299  * string "1", this should be compatible to the MD5-based BSD password
 300  * algorithm. For 'magic' string "apr1", this is compatible to the MD5-based
 301  * Apache password algorithm. (Apparently, the Apache password algorithm is
 302  * identical except that the 'magic' string was changed -- the laziest
 303  * application of the NIH principle I've ever encountered.)
 304  */
 305 static char *md5crypt(const char *passwd, const char *magic, const char *salt)
 306 {
 307     /* "$apr1$..salt..$.......md5hash..........\0" */
 308     static char out_buf[6 + 9 + 24 + 2];
 309     unsigned char buf[MD5_DIGEST_LENGTH];
 310     char *salt_out;
 311     int n;
 312     unsigned int i;
 313     EVP_MD_CTX md, md2;
 314     size_t passwd_len, salt_len;
 315
 316     passwd_len = strlen(passwd);
 317     out_buf[0] = '$';
 318     out_buf[1] = 0;
 319     assert(strlen(magic) <= 4); /* "1" or "apr1" */
 320     strncat(out_buf, magic, 4);
 321     strncat(out_buf, "$", 1);
 322     strncat(out_buf, salt, 8);
 323     assert(strlen(out_buf) <= 6 + 8); /* "$apr1$..salt.." */
 324     salt_out = out_buf + 2 + strlen(magic);
 325     salt_len = strlen(salt_out);
 326     assert(salt_len <= 8);
 327
 328     EVP_MD_CTX_init(&md);
 329     EVP_DigestInit_ex(&md, EVP_md5(), NULL);
 330     EVP_DigestUpdate(&md, passwd, passwd_len);
 331     EVP_DigestUpdate(&md, "$", 1);
 332     EVP_DigestUpdate(&md, magic, strlen(magic));
 333     EVP_DigestUpdate(&md, "$", 1);
 334     EVP_DigestUpdate(&md, salt_out, salt_len);
 335
 336     EVP_MD_CTX_init(&md2);
 337     EVP_DigestInit_ex(&md2, EVP_md5(), NULL);
 338     EVP_DigestUpdate(&md2, passwd, passwd_len);
 339     EVP_DigestUpdate(&md2, salt_out, salt_len);
 340     EVP_DigestUpdate(&md2, passwd, passwd_len);
 341     EVP_DigestFinal_ex(&md2, buf, NULL);
 342
 343     for (i = passwd_len; i > sizeof buf; i -= sizeof buf)
 344         EVP_DigestUpdate(&md, buf, sizeof buf);
 345     EVP_DigestUpdate(&md, buf, i);
 346
 347     n = passwd_len;
 348     while (n) {
 349         EVP_DigestUpdate(&md, (n & 1) ? "\0" : passwd, 1);
 350         n >>= 1;
 351     }
 352     EVP_DigestFinal_ex(&md, buf, NULL);
 353
 354     for (i = 0; i < 1000; i++) {
 355         EVP_DigestInit_ex(&md2, EVP_md5(), NULL);
 356         EVP_DigestUpdate(&md2, (i & 1) ? (unsigned const char *)passwd : buf,
 357                          (i & 1) ? passwd_len : sizeof buf);
 358         if (i % 3)
 359             EVP_DigestUpdate(&md2, salt_out, salt_len);
 360         if (i % 7)
 361             EVP_DigestUpdate(&md2, passwd, passwd_len);
 362         EVP_DigestUpdate(&md2, (i & 1) ? buf : (unsigned const char *)passwd,
 363                          (i & 1) ? sizeof buf : passwd_len);
 364         EVP_DigestFinal_ex(&md2, buf, NULL);
 365     }
 366     EVP_MD_CTX_cleanup(&md2);
 367
 368     {
 369         /* transform buf into output string */
 370
 371         unsigned char buf_perm[sizeof buf];
 372         int dest, source;
 373         char *output;
 374
 375         /* silly output permutation */
 376         for (dest = 0, source = 0; dest < 14;
 377              dest++, source = (source + 6) % 17)
 378             buf_perm[dest] = buf[source];
 379         buf_perm[14] = buf[5];
 380         buf_perm[15] = buf[11];
 381 #  ifndef PEDANTIC              /* Unfortunately, this generates a "no
 382                                  * effect" warning */
 383         assert(16 == sizeof buf_perm);
 384 #  endif
 385
 386         output = salt_out + salt_len;
 387         assert(output == out_buf + strlen(out_buf));
 388
 389         *output++ = '$';
 390
 391         for (i = 0; i < 15; i += 3) {
 392             *output++ = cov_2char[buf_perm[i + 2] & 0x3f];
 393             *output++ = cov_2char[((buf_perm[i + 1] & 0xf) << 2) |
 394                                   (buf_perm[i + 2] >> 6)];
 395             *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
 396                                   (buf_perm[i + 1] >> 4)];
 397             *output++ = cov_2char[buf_perm[i] >> 2];
 398         }
 399         assert(i == 15);
 400         *output++ = cov_2char[buf_perm[i] & 0x3f];
 401         *output++ = cov_2char[buf_perm[i] >> 6];
 402         *output = 0;
 403         assert(strlen(out_buf) < sizeof(out_buf));
 404     }
 405     EVP_MD_CTX_cleanup(&md);
 406
 407     return out_buf;
 408 }
 409 # endif
 410
 411 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
 412                      char *passwd, BIO *out, int quiet, int table,
 413                      int reverse, size_t pw_maxlen, int usecrypt, int use1,
 414                      int useapr1)
 415 {
 416     char *hash = NULL;
 417
 418     assert(salt_p != NULL);
 419     assert(salt_malloc_p != NULL);
 420
 421     /* first make sure we have a salt */
 422     if (!passed_salt) {
 423 # ifndef OPENSSL_NO_DES
 424         if (usecrypt) {
 425             if (*salt_malloc_p == NULL) {
 426                 *salt_p = *salt_malloc_p = app_malloc(3, "salt buffer");
 427             }
 428             if (RAND_bytes((unsigned char *)*salt_p, 2) <= 0)
 429                 goto end;
 430             (*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
 431             (*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
 432             (*salt_p)[2] = 0;
 433 #  ifdef CHARSET_EBCDIC
 434             ascii2ebcdic(*salt_p, *salt_p, 2); /* des_crypt will convert back
 435                                                 * to ASCII */
 436 #  endif
 437         }
 438 # endif                         /* !OPENSSL_NO_DES */
 439
 440 # ifndef NO_MD5CRYPT_1
 441         if (use1 || useapr1) {
 442             int i;
 443
 444             if (*salt_malloc_p == NULL) {
 445                 *salt_p = *salt_malloc_p = app_malloc(9, "salt buffer");
 446             }
 447             if (RAND_bytes((unsigned char *)*salt_p, 8) <= 0)
 448                 goto end;
 449
 450             for (i = 0; i < 8; i++)
 451                 (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 452             (*salt_p)[8] = 0;
 453         }
 454 # endif                         /* !NO_MD5CRYPT_1 */
 455     }
 456
 457     assert(*salt_p != NULL);
 458
 459     /* truncate password if necessary */
 460     if ((strlen(passwd) > pw_maxlen)) {
 461         if (!quiet)
 462             /*
 463              * XXX: really we should know how to print a size_t, not cast it
 464              */
 465             BIO_printf(bio_err,
 466                        "Warning: truncating password to %u characters\n",
 467                        (unsigned)pw_maxlen);
 468         passwd[pw_maxlen] = 0;
 469     }
 470     assert(strlen(passwd) <= pw_maxlen);
 471
 472     /* now compute password hash */
 473 # ifndef OPENSSL_NO_DES
 474     if (usecrypt)
 475         hash = DES_crypt(passwd, *salt_p);
 476 # endif
 477 # ifndef NO_MD5CRYPT_1
 478     if (use1 || useapr1)
 479         hash = md5crypt(passwd, (use1 ? "1" : "apr1"), *salt_p);
 480 # endif
 481     assert(hash != NULL);
 482
 483     if (table && !reverse)
 484         BIO_printf(out, "%s\t%s\n", passwd, hash);
 485     else if (table && reverse)
 486         BIO_printf(out, "%s\t%s\n", hash, passwd);
 487     else
 488         BIO_printf(out, "%s\n", hash);
 489     return 0;
 490
 491  end:
 492     return 1;
 493 }
 494 #else
 495
 496 int passwd_main(int argc, char **argv)
 497 {
 498     fputs("Program not available.\n", stderr)
 499         return (1);
 500 }
 501 #endif