apps/passwd.c

   1 /* apps/passwd.c */
   2
   3 #if defined OPENSSL_NO_MD5 || defined CHARSET_EBCDIC
   4 # define NO_MD5CRYPT_1
   5 #endif
   6
   7 #if !defined(OPENSSL_NO_DES) || !defined(NO_MD5CRYPT_1)
   8
   9 # include <assert.h>
  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 # ifndef NO_MD5CRYPT_1
  22 #  include <openssl/md5.h>
  23 # endif
  24
  25 # undef PROG
  26 # define PROG passwd_main
  27
  28 static unsigned const char cov_2char[64] = {
  29     /* from crypto/des/fcrypt.c */
  30     0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
  31     0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44,
  32     0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C,
  33     0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54,
  34     0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62,
  35     0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
  36     0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72,
  37     0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
  38 };
  39
  40 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
  41                      char *passwd, BIO *out, int quiet, int table,
  42                      int reverse, size_t pw_maxlen, int usecrypt, int use1,
  43                      int useapr1);
  44
  45 /*-
  46  * -crypt        - standard Unix password algorithm (default)
  47  * -1            - MD5-based password algorithm
  48  * -apr1         - MD5-based password algorithm, Apache variant
  49  * -salt string  - salt
  50  * -in file      - read passwords from file
  51  * -stdin        - read passwords from stdin
  52  * -noverify     - never verify when reading password from terminal
  53  * -quiet        - no warnings
  54  * -table        - format output as table
  55  * -reverse      - switch table columns
  56  */
  57
  58 int MAIN(int, char **);
  59
  60 int MAIN(int argc, char **argv)
  61 {
  62     int ret = 1;
  63     char *infile = NULL;
  64     int in_stdin = 0;
  65     int in_noverify = 0;
  66     char *salt = NULL, *passwd = NULL, **passwds = NULL;
  67     char *salt_malloc = NULL, *passwd_malloc = NULL;
  68     size_t passwd_malloc_size = 0;
  69     int pw_source_defined = 0;
  70     BIO *in = NULL, *out = NULL;
  71     int i, badopt, opt_done;
  72     int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
  73     int usecrypt = 0, use1 = 0, useapr1 = 0;
  74     size_t pw_maxlen = 0;
  75
  76     apps_startup();
  77
  78     if (bio_err == NULL)
  79         if ((bio_err = BIO_new(BIO_s_file())) != NULL)
  80             BIO_set_fp(bio_err, stderr, BIO_NOCLOSE | BIO_FP_TEXT);
  81
  82     if (!load_config(bio_err, NULL))
  83         goto err;
  84     out = BIO_new(BIO_s_file());
  85     if (out == NULL)
  86         goto err;
  87     BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
  88 # ifdef OPENSSL_SYS_VMS
  89     {
  90         BIO *tmpbio = BIO_new(BIO_f_linebuffer());
  91         out = BIO_push(tmpbio, out);
  92     }
  93 # endif
  94
  95     badopt = 0, opt_done = 0;
  96     i = 0;
  97     while (!badopt && !opt_done && argv[++i] != NULL) {
  98         if (strcmp(argv[i], "-crypt") == 0)
  99             usecrypt = 1;
 100         else if (strcmp(argv[i], "-1") == 0)
 101             use1 = 1;
 102         else if (strcmp(argv[i], "-apr1") == 0)
 103             useapr1 = 1;
 104         else if (strcmp(argv[i], "-salt") == 0) {
 105             if ((argv[i + 1] != NULL) && (salt == NULL)) {
 106                 passed_salt = 1;
 107                 salt = argv[++i];
 108             } else
 109                 badopt = 1;
 110         } else if (strcmp(argv[i], "-in") == 0) {
 111             if ((argv[i + 1] != NULL) && !pw_source_defined) {
 112                 pw_source_defined = 1;
 113                 infile = argv[++i];
 114             } else
 115                 badopt = 1;
 116         } else if (strcmp(argv[i], "-stdin") == 0) {
 117             if (!pw_source_defined) {
 118                 pw_source_defined = 1;
 119                 in_stdin = 1;
 120             } else
 121                 badopt = 1;
 122         } else if (strcmp(argv[i], "-noverify") == 0)
 123             in_noverify = 1;
 124         else if (strcmp(argv[i], "-quiet") == 0)
 125             quiet = 1;
 126         else if (strcmp(argv[i], "-table") == 0)
 127             table = 1;
 128         else if (strcmp(argv[i], "-reverse") == 0)
 129             reverse = 1;
 130         else if (argv[i][0] == '-')
 131             badopt = 1;
 132         else if (!pw_source_defined)
 133             /* non-option arguments, use as passwords */
 134         {
 135             pw_source_defined = 1;
 136             passwds = &argv[i];
 137             opt_done = 1;
 138         } else
 139             badopt = 1;
 140     }
 141
 142     if (!usecrypt && !use1 && !useapr1) /* use default */
 143         usecrypt = 1;
 144     if (usecrypt + use1 + useapr1 > 1) /* conflict */
 145         badopt = 1;
 146
 147     /* reject unsupported algorithms */
 148 # ifdef OPENSSL_NO_DES
 149     if (usecrypt)
 150         badopt = 1;
 151 # endif
 152 # ifdef NO_MD5CRYPT_1
 153     if (use1 || useapr1)
 154         badopt = 1;
 155 # endif
 156
 157     if (badopt) {
 158         BIO_printf(bio_err, "Usage: passwd [options] [passwords]\n");
 159         BIO_printf(bio_err, "where options are\n");
 160 # ifndef OPENSSL_NO_DES
 161         BIO_printf(bio_err,
 162                    "-crypt             standard Unix password algorithm (default)\n");
 163 # endif
 164 # ifndef NO_MD5CRYPT_1
 165         BIO_printf(bio_err,
 166                    "-1                 MD5-based password algorithm\n");
 167         BIO_printf(bio_err,
 168                    "-apr1              MD5-based password algorithm, Apache variant\n");
 169 # endif
 170         BIO_printf(bio_err, "-salt string       use provided salt\n");
 171         BIO_printf(bio_err, "-in file           read passwords from file\n");
 172         BIO_printf(bio_err, "-stdin             read passwords from stdin\n");
 173         BIO_printf(bio_err,
 174                    "-noverify          never verify when reading password from terminal\n");
 175         BIO_printf(bio_err, "-quiet             no warnings\n");
 176         BIO_printf(bio_err, "-table             format output as table\n");
 177         BIO_printf(bio_err, "-reverse           switch table columns\n");
 178
 179         goto err;
 180     }
 181
 182     if ((infile != NULL) || in_stdin) {
 183         in = BIO_new(BIO_s_file());
 184         if (in == NULL)
 185             goto err;
 186         if (infile != NULL) {
 187             assert(in_stdin == 0);
 188             if (BIO_read_filename(in, infile) <= 0)
 189                 goto err;
 190         } else {
 191             assert(in_stdin);
 192             BIO_set_fp(in, stdin, BIO_NOCLOSE);
 193         }
 194     }
 195
 196     if (usecrypt)
 197         pw_maxlen = 8;
 198     else if (use1 || useapr1)
 199         pw_maxlen = 256;        /* arbitrary limit, should be enough for most
 200                                  * passwords */
 201
 202     if (passwds == NULL) {
 203         /* no passwords on the command line */
 204
 205         passwd_malloc_size = pw_maxlen + 2;
 206         /*
 207          * longer than necessary so that we can warn about truncation
 208          */
 209         passwd = passwd_malloc = OPENSSL_malloc(passwd_malloc_size);
 210         if (passwd_malloc == NULL)
 211             goto err;
 212     }
 213
 214     if ((in == NULL) && (passwds == NULL)) {
 215         /* build a null-terminated list */
 216         static char *passwds_static[2] = { NULL, NULL };
 217
 218         passwds = passwds_static;
 219         if (in == NULL)
 220             if (EVP_read_pw_string
 221                 (passwd_malloc, passwd_malloc_size, "Password: ",
 222                  !(passed_salt || in_noverify)) != 0)
 223                 goto err;
 224         passwds[0] = passwd_malloc;
 225     }
 226
 227     if (in == NULL) {
 228         assert(passwds != NULL);
 229         assert(*passwds != NULL);
 230
 231         do {                    /* loop over list of passwords */
 232             passwd = *passwds++;
 233             if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
 234                            quiet, table, reverse, pw_maxlen, usecrypt, use1,
 235                            useapr1))
 236                 goto err;
 237         }
 238         while (*passwds != NULL);
 239     } else
 240         /* in != NULL */
 241     {
 242         int done;
 243
 244         assert(passwd != NULL);
 245         do {
 246             int r = BIO_gets(in, passwd, pw_maxlen + 1);
 247             if (r > 0) {
 248                 char *c = (strchr(passwd, '\n'));
 249                 if (c != NULL)
 250                     *c = 0;     /* truncate at newline */
 251                 else {
 252                     /* ignore rest of line */
 253                     char trash[BUFSIZ];
 254                     do
 255                         r = BIO_gets(in, trash, sizeof trash);
 256                     while ((r > 0) && (!strchr(trash, '\n')));
 257                 }
 258
 259                 if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
 260                                quiet, table, reverse, pw_maxlen, usecrypt,
 261                                use1, useapr1))
 262                     goto err;
 263             }
 264             done = (r <= 0);
 265         }
 266         while (!done);
 267     }
 268     ret = 0;
 269
 270  err:
 271     ERR_print_errors(bio_err);
 272     if (salt_malloc)
 273         OPENSSL_free(salt_malloc);
 274     if (passwd_malloc)
 275         OPENSSL_free(passwd_malloc);
 276     if (in)
 277         BIO_free(in);
 278     if (out)
 279         BIO_free_all(out);
 280     apps_shutdown();
 281     OPENSSL_EXIT(ret);
 282 }
 283
 284 # ifndef NO_MD5CRYPT_1
 285 /*
 286  * MD5-based password algorithm (should probably be available as a library
 287  * function; then the static buffer would not be acceptable). For magic
 288  * string "1", this should be compatible to the MD5-based BSD password
 289  * algorithm. For 'magic' string "apr1", this is compatible to the MD5-based
 290  * Apache password algorithm. (Apparently, the Apache password algorithm is
 291  * identical except that the 'magic' string was changed -- the laziest
 292  * application of the NIH principle I've ever encountered.)
 293  */
 294 static char *md5crypt(const char *passwd, const char *magic, const char *salt)
 295 {
 296     /* "$apr1$..salt..$.......md5hash..........\0" */
 297     static char out_buf[6 + 9 + 24 + 2];
 298     unsigned char buf[MD5_DIGEST_LENGTH];
 299     char *salt_out;
 300     int n;
 301     unsigned int i;
 302     EVP_MD_CTX md, md2;
 303     size_t passwd_len, salt_len;
 304
 305     passwd_len = strlen(passwd);
 306     out_buf[0] = '$';
 307     out_buf[1] = 0;
 308     assert(strlen(magic) <= 4); /* "1" or "apr1" */
 309     strncat(out_buf, magic, 4);
 310     strncat(out_buf, "$", 1);
 311     strncat(out_buf, salt, 8);
 312     assert(strlen(out_buf) <= 6 + 8); /* "$apr1$..salt.." */
 313     salt_out = out_buf + 2 + strlen(magic);
 314     salt_len = strlen(salt_out);
 315     assert(salt_len <= 8);
 316
 317     EVP_MD_CTX_init(&md);
 318     EVP_DigestInit_ex(&md, EVP_md5(), NULL);
 319     EVP_DigestUpdate(&md, passwd, passwd_len);
 320     EVP_DigestUpdate(&md, "$", 1);
 321     EVP_DigestUpdate(&md, magic, strlen(magic));
 322     EVP_DigestUpdate(&md, "$", 1);
 323     EVP_DigestUpdate(&md, salt_out, salt_len);
 324
 325     EVP_MD_CTX_init(&md2);
 326     EVP_DigestInit_ex(&md2, EVP_md5(), NULL);
 327     EVP_DigestUpdate(&md2, passwd, passwd_len);
 328     EVP_DigestUpdate(&md2, salt_out, salt_len);
 329     EVP_DigestUpdate(&md2, passwd, passwd_len);
 330     EVP_DigestFinal_ex(&md2, buf, NULL);
 331
 332     for (i = passwd_len; i > sizeof buf; i -= sizeof buf)
 333         EVP_DigestUpdate(&md, buf, sizeof buf);
 334     EVP_DigestUpdate(&md, buf, i);
 335
 336     n = passwd_len;
 337     while (n) {
 338         EVP_DigestUpdate(&md, (n & 1) ? "\0" : passwd, 1);
 339         n >>= 1;
 340     }
 341     EVP_DigestFinal_ex(&md, buf, NULL);
 342
 343     for (i = 0; i < 1000; i++) {
 344         EVP_DigestInit_ex(&md2, EVP_md5(), NULL);
 345         EVP_DigestUpdate(&md2, (i & 1) ? (unsigned const char *)passwd : buf,
 346                          (i & 1) ? passwd_len : sizeof buf);
 347         if (i % 3)
 348             EVP_DigestUpdate(&md2, salt_out, salt_len);
 349         if (i % 7)
 350             EVP_DigestUpdate(&md2, passwd, passwd_len);
 351         EVP_DigestUpdate(&md2, (i & 1) ? buf : (unsigned const char *)passwd,
 352                          (i & 1) ? sizeof buf : passwd_len);
 353         EVP_DigestFinal_ex(&md2, buf, NULL);
 354     }
 355     EVP_MD_CTX_cleanup(&md2);
 356
 357     {
 358         /* transform buf into output string */
 359
 360         unsigned char buf_perm[sizeof buf];
 361         int dest, source;
 362         char *output;
 363
 364         /* silly output permutation */
 365         for (dest = 0, source = 0; dest < 14;
 366              dest++, source = (source + 6) % 17)
 367             buf_perm[dest] = buf[source];
 368         buf_perm[14] = buf[5];
 369         buf_perm[15] = buf[11];
 370 #  ifndef PEDANTIC              /* Unfortunately, this generates a "no
 371                                  * effect" warning */
 372         assert(16 == sizeof buf_perm);
 373 #  endif
 374
 375         output = salt_out + salt_len;
 376         assert(output == out_buf + strlen(out_buf));
 377
 378         *output++ = '$';
 379
 380         for (i = 0; i < 15; i += 3) {
 381             *output++ = cov_2char[buf_perm[i + 2] & 0x3f];
 382             *output++ = cov_2char[((buf_perm[i + 1] & 0xf) << 2) |
 383                                   (buf_perm[i + 2] >> 6)];
 384             *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
 385                                   (buf_perm[i + 1] >> 4)];
 386             *output++ = cov_2char[buf_perm[i] >> 2];
 387         }
 388         assert(i == 15);
 389         *output++ = cov_2char[buf_perm[i] & 0x3f];
 390         *output++ = cov_2char[buf_perm[i] >> 6];
 391         *output = 0;
 392         assert(strlen(out_buf) < sizeof(out_buf));
 393     }
 394     EVP_MD_CTX_cleanup(&md);
 395
 396     return out_buf;
 397 }
 398 # endif
 399
 400 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
 401                      char *passwd, BIO *out, int quiet, int table,
 402                      int reverse, size_t pw_maxlen, int usecrypt, int use1,
 403                      int useapr1)
 404 {
 405     char *hash = NULL;
 406
 407     assert(salt_p != NULL);
 408     assert(salt_malloc_p != NULL);
 409
 410     /* first make sure we have a salt */
 411     if (!passed_salt) {
 412 # ifndef OPENSSL_NO_DES
 413         if (usecrypt) {
 414             if (*salt_malloc_p == NULL) {
 415                 *salt_p = *salt_malloc_p = OPENSSL_malloc(3);
 416                 if (*salt_malloc_p == NULL)
 417                     goto err;
 418             }
 419             if (RAND_bytes((unsigned char *)*salt_p, 2) <= 0)
 420                 goto err;
 421             (*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
 422             (*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
 423             (*salt_p)[2] = 0;
 424 #  ifdef CHARSET_EBCDIC
 425             ascii2ebcdic(*salt_p, *salt_p, 2); /* des_crypt will convert back
 426                                                 * to ASCII */
 427 #  endif
 428         }
 429 # endif                         /* !OPENSSL_NO_DES */
 430
 431 # ifndef NO_MD5CRYPT_1
 432         if (use1 || useapr1) {
 433             int i;
 434
 435             if (*salt_malloc_p == NULL) {
 436                 *salt_p = *salt_malloc_p = OPENSSL_malloc(9);
 437                 if (*salt_malloc_p == NULL)
 438                     goto err;
 439             }
 440             if (RAND_bytes((unsigned char *)*salt_p, 8) <= 0)
 441                 goto err;
 442
 443             for (i = 0; i < 8; i++)
 444                 (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 445             (*salt_p)[8] = 0;
 446         }
 447 # endif                         /* !NO_MD5CRYPT_1 */
 448     }
 449
 450     assert(*salt_p != NULL);
 451
 452     /* truncate password if necessary */
 453     if ((strlen(passwd) > pw_maxlen)) {
 454         if (!quiet)
 455             /*
 456              * XXX: really we should know how to print a size_t, not cast it
 457              */
 458             BIO_printf(bio_err,
 459                        "Warning: truncating password to %u characters\n",
 460                        (unsigned)pw_maxlen);
 461         passwd[pw_maxlen] = 0;
 462     }
 463     assert(strlen(passwd) <= pw_maxlen);
 464
 465     /* now compute password hash */
 466 # ifndef OPENSSL_NO_DES
 467     if (usecrypt)
 468         hash = DES_crypt(passwd, *salt_p);
 469 # endif
 470 # ifndef NO_MD5CRYPT_1
 471     if (use1 || useapr1)
 472         hash = md5crypt(passwd, (use1 ? "1" : "apr1"), *salt_p);
 473 # endif
 474     assert(hash != NULL);
 475
 476     if (table && !reverse)
 477         BIO_printf(out, "%s\t%s\n", passwd, hash);
 478     else if (table && reverse)
 479         BIO_printf(out, "%s\t%s\n", hash, passwd);
 480     else
 481         BIO_printf(out, "%s\n", hash);
 482     return 1;
 483
 484  err:
 485     return 0;
 486 }
 487 #else
 488
 489 int MAIN(int argc, char **argv)
 490 {
 491     fputs("Program not available.\n", stderr)
 492         OPENSSL_EXIT(1);
 493 }
 494 #endif