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
  26 #undef PROG
  27 #define PROG passwd_main
  28
  29
  30 static unsigned const char cov_2char[64]={
  31         /* from crypto/des/fcrypt.c */
  32         0x2E,0x2F,0x30,0x31,0x32,0x33,0x34,0x35,
  33         0x36,0x37,0x38,0x39,0x41,0x42,0x43,0x44,
  34         0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,
  35         0x4D,0x4E,0x4F,0x50,0x51,0x52,0x53,0x54,
  36         0x55,0x56,0x57,0x58,0x59,0x5A,0x61,0x62,
  37         0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,
  38         0x6B,0x6C,0x6D,0x6E,0x6F,0x70,0x71,0x72,
  39         0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A
  40 };
  41
  42 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
  43         char *passwd, BIO *out, int quiet, int table, int reverse,
  44         size_t pw_maxlen, int usecrypt, int use1, int useapr1);
  45
  46 /*-
  47  * -crypt        - standard Unix password algorithm (default)
  48  * -1            - MD5-based password algorithm
  49  * -apr1         - MD5-based password algorithm, Apache variant
  50  * -salt string  - salt
  51  * -in file      - read passwords from file
  52  * -stdin        - read passwords from stdin
  53  * -noverify     - never verify when reading password from terminal
  54  * -quiet        - no warnings
  55  * -table        - format output as table
  56  * -reverse      - switch table columns
  57  */
  58
  59 int MAIN(int, char **);
  60
  61 int MAIN(int argc, char **argv)
  62         {
  63         int ret = 1;
  64         char *infile = NULL;
  65         int in_stdin = 0;
  66         int in_noverify = 0;
  67         char *salt = NULL, *passwd = NULL, **passwds = NULL;
  68         char *salt_malloc = NULL, *passwd_malloc = NULL;
  69         size_t passwd_malloc_size = 0;
  70         int pw_source_defined = 0;
  71         BIO *in = NULL, *out = NULL;
  72         int i, badopt, opt_done;
  73         int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
  74         int usecrypt = 0, use1 = 0, useapr1 = 0;
  75         size_t pw_maxlen = 0;
  76
  77         apps_startup();
  78
  79         if (bio_err == NULL)
  80                 if ((bio_err=BIO_new(BIO_s_file())) != NULL)
  81                         BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
  82
  83         if (!load_config(bio_err, NULL))
  84                 goto err;
  85         out = BIO_new(BIO_s_file());
  86         if (out == NULL)
  87                 goto err;
  88         BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
  89 #ifdef OPENSSL_SYS_VMS
  90         {
  91         BIO *tmpbio = BIO_new(BIO_f_linebuffer());
  92         out = BIO_push(tmpbio, out);
  93         }
  94 #endif
  95
  96         badopt = 0, opt_done = 0;
  97         i = 0;
  98         while (!badopt && !opt_done && argv[++i] != NULL)
  99                 {
 100                 if (strcmp(argv[i], "-crypt") == 0)
 101                         usecrypt = 1;
 102                 else if (strcmp(argv[i], "-1") == 0)
 103                         use1 = 1;
 104                 else if (strcmp(argv[i], "-apr1") == 0)
 105                         useapr1 = 1;
 106                 else if (strcmp(argv[i], "-salt") == 0)
 107                         {
 108                         if ((argv[i+1] != NULL) && (salt == NULL))
 109                                 {
 110                                 passed_salt = 1;
 111                                 salt = argv[++i];
 112                                 }
 113                         else
 114                                 badopt = 1;
 115                         }
 116                 else if (strcmp(argv[i], "-in") == 0)
 117                         {
 118                         if ((argv[i+1] != NULL) && !pw_source_defined)
 119                                 {
 120                                 pw_source_defined = 1;
 121                                 infile = argv[++i];
 122                                 }
 123                         else
 124                                 badopt = 1;
 125                         }
 126                 else if (strcmp(argv[i], "-stdin") == 0)
 127                         {
 128                         if (!pw_source_defined)
 129                                 {
 130                                 pw_source_defined = 1;
 131                                 in_stdin = 1;
 132                                 }
 133                         else
 134                                 badopt = 1;
 135                         }
 136                 else if (strcmp(argv[i], "-noverify") == 0)
 137                         in_noverify = 1;
 138                 else if (strcmp(argv[i], "-quiet") == 0)
 139                         quiet = 1;
 140                 else if (strcmp(argv[i], "-table") == 0)
 141                         table = 1;
 142                 else if (strcmp(argv[i], "-reverse") == 0)
 143                         reverse = 1;
 144                 else if (argv[i][0] == '-')
 145                         badopt = 1;
 146                 else if (!pw_source_defined)
 147                         /* non-option arguments, use as passwords */
 148                         {
 149                         pw_source_defined = 1;
 150                         passwds = &argv[i];
 151                         opt_done = 1;
 152                         }
 153                 else
 154                         badopt = 1;
 155                 }
 156
 157         if (!usecrypt && !use1 && !useapr1) /* use default */
 158                 usecrypt = 1;
 159         if (usecrypt + use1 + useapr1 > 1) /* conflict */
 160                 badopt = 1;
 161
 162         /* reject unsupported algorithms */
 163 #ifdef OPENSSL_NO_DES
 164         if (usecrypt) badopt = 1;
 165 #endif
 166 #ifdef NO_MD5CRYPT_1
 167         if (use1 || useapr1) badopt = 1;
 168 #endif
 169
 170         if (badopt)
 171                 {
 172                 BIO_printf(bio_err, "Usage: passwd [options] [passwords]\n");
 173                 BIO_printf(bio_err, "where options are\n");
 174 #ifndef OPENSSL_NO_DES
 175                 BIO_printf(bio_err, "-crypt             standard Unix password algorithm (default)\n");
 176 #endif
 177 #ifndef NO_MD5CRYPT_1
 178                 BIO_printf(bio_err, "-1                 MD5-based password algorithm\n");
 179                 BIO_printf(bio_err, "-apr1              MD5-based password algorithm, Apache variant\n");
 180 #endif
 181                 BIO_printf(bio_err, "-salt string       use provided salt\n");
 182                 BIO_printf(bio_err, "-in file           read passwords from file\n");
 183                 BIO_printf(bio_err, "-stdin             read passwords from stdin\n");
 184                 BIO_printf(bio_err, "-noverify          never verify when reading password from terminal\n");
 185                 BIO_printf(bio_err, "-quiet             no warnings\n");
 186                 BIO_printf(bio_err, "-table             format output as table\n");
 187                 BIO_printf(bio_err, "-reverse           switch table columns\n");
 188
 189                 goto err;
 190                 }
 191
 192         if ((infile != NULL) || in_stdin)
 193                 {
 194                 in = BIO_new(BIO_s_file());
 195                 if (in == NULL)
 196                         goto err;
 197                 if (infile != NULL)
 198                         {
 199                         assert(in_stdin == 0);
 200                         if (BIO_read_filename(in, infile) <= 0)
 201                                 goto err;
 202                         }
 203                 else
 204                         {
 205                         assert(in_stdin);
 206                         BIO_set_fp(in, stdin, BIO_NOCLOSE);
 207                         }
 208                 }
 209
 210         if (usecrypt)
 211                 pw_maxlen = 8;
 212         else if (use1 || useapr1)
 213                 pw_maxlen = 256; /* arbitrary limit, should be enough for most passwords */
 214
 215         if (passwds == NULL)
 216                 {
 217                 /* no passwords on the command line */
 218
 219                 passwd_malloc_size = pw_maxlen + 2;
 220                 /* longer than necessary so that we can warn about truncation */
 221                 passwd = passwd_malloc = OPENSSL_malloc(passwd_malloc_size);
 222                 if (passwd_malloc == NULL)
 223                         goto err;
 224                 }
 225
 226         if ((in == NULL) && (passwds == NULL))
 227                 {
 228                 /* build a null-terminated list */
 229                 static char *passwds_static[2] = {NULL, NULL};
 230
 231                 passwds = passwds_static;
 232                 if (in == NULL)
 233                         if (EVP_read_pw_string(passwd_malloc, passwd_malloc_size, "Password: ", !(passed_salt || in_noverify)) != 0)
 234                                 goto err;
 235                 passwds[0] = passwd_malloc;
 236                 }
 237
 238         if (in == NULL)
 239                 {
 240                 assert(passwds != NULL);
 241                 assert(*passwds != NULL);
 242
 243                 do /* loop over list of passwords */
 244                         {
 245                         passwd = *passwds++;
 246                         if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
 247                                 quiet, table, reverse, pw_maxlen, usecrypt, use1, useapr1))
 248                                 goto err;
 249                         }
 250                 while (*passwds != NULL);
 251                 }
 252         else
 253                 /* in != NULL */
 254                 {
 255                 int done;
 256
 257                 assert (passwd != NULL);
 258                 do
 259                         {
 260                         int r = BIO_gets(in, passwd, pw_maxlen + 1);
 261                         if (r > 0)
 262                                 {
 263                                 char *c = (strchr(passwd, '\n')) ;
 264                                 if (c != NULL)
 265                                         *c = 0; /* truncate at newline */
 266                                 else
 267                                         {
 268                                         /* ignore rest of line */
 269                                         char trash[BUFSIZ];
 270                                         do
 271                                                 r = BIO_gets(in, trash, sizeof trash);
 272                                         while ((r > 0) && (!strchr(trash, '\n')));
 273                                         }
 274
 275                                 if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
 276                                         quiet, table, reverse, pw_maxlen, usecrypt, use1, useapr1))
 277                                         goto err;
 278                                 }
 279                         done = (r <= 0);
 280                         }
 281                 while (!done);
 282                 }
 283         ret = 0;
 284
 285 err:
 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         if (in)
 292                 BIO_free(in);
 293         if (out)
 294                 BIO_free_all(out);
 295         apps_shutdown();
 296         OPENSSL_EXIT(ret);
 297         }
 298
 299
 300 #ifndef NO_MD5CRYPT_1
 301 /* MD5-based password algorithm (should probably be available as a library
 302  * function; then the static buffer would not be acceptable).
 303  * For magic string "1", this should be compatible to the MD5-based BSD
 304  * password algorithm.
 305  * For 'magic' string "apr1", this is compatible to the MD5-based Apache
 306  * password algorithm.
 307  * (Apparently, the Apache password algorithm is identical except that the
 308  * 'magic' string was changed -- the laziest application of the NIH principle
 309  * I've ever encountered.)
 310  */
 311 static char *md5crypt(const char *passwd, const char *magic, const char *salt)
 312         {
 313         static char out_buf[6 + 9 + 24 + 2]; /* "$apr1$..salt..$.......md5hash..........\0" */
 314         unsigned char buf[MD5_DIGEST_LENGTH];
 315         char *salt_out;
 316         int n;
 317         unsigned int i;
 318         EVP_MD_CTX md,md2;
 319         size_t passwd_len, salt_len;
 320
 321         passwd_len = strlen(passwd);
 322         out_buf[0] = '$';
 323         out_buf[1] = 0;
 324         assert(strlen(magic) <= 4); /* "1" or "apr1" */
 325         strncat(out_buf, magic, 4);
 326         strncat(out_buf, "$", 1);
 327         strncat(out_buf, salt, 8);
 328         assert(strlen(out_buf) <= 6 + 8); /* "$apr1$..salt.." */
 329         salt_out = out_buf + 2 + strlen(magic);
 330         salt_len = strlen(salt_out);
 331         assert(salt_len <= 8);
 332
 333         EVP_MD_CTX_init(&md);
 334         EVP_DigestInit_ex(&md,EVP_md5(), NULL);
 335         EVP_DigestUpdate(&md, passwd, passwd_len);
 336         EVP_DigestUpdate(&md, "$", 1);
 337         EVP_DigestUpdate(&md, magic, strlen(magic));
 338         EVP_DigestUpdate(&md, "$", 1);
 339         EVP_DigestUpdate(&md, salt_out, salt_len);
 340
 341         EVP_MD_CTX_init(&md2);
 342         EVP_DigestInit_ex(&md2,EVP_md5(), NULL);
 343         EVP_DigestUpdate(&md2, passwd, passwd_len);
 344         EVP_DigestUpdate(&md2, salt_out, salt_len);
 345         EVP_DigestUpdate(&md2, passwd, passwd_len);
 346         EVP_DigestFinal_ex(&md2, buf, NULL);
 347
 348         for (i = passwd_len; i > sizeof buf; i -= sizeof buf)
 349                 EVP_DigestUpdate(&md, buf, sizeof buf);
 350         EVP_DigestUpdate(&md, buf, i);
 351
 352         n = passwd_len;
 353         while (n)
 354                 {
 355                 EVP_DigestUpdate(&md, (n & 1) ? "\0" : passwd, 1);
 356                 n >>= 1;
 357                 }
 358         EVP_DigestFinal_ex(&md, buf, NULL);
 359
 360         for (i = 0; i < 1000; i++)
 361                 {
 362                 EVP_DigestInit_ex(&md2,EVP_md5(), NULL);
 363                 EVP_DigestUpdate(&md2, (i & 1) ? (unsigned const char *) passwd : buf,
 364                                        (i & 1) ? passwd_len : sizeof buf);
 365                 if (i % 3)
 366                         EVP_DigestUpdate(&md2, salt_out, salt_len);
 367                 if (i % 7)
 368                         EVP_DigestUpdate(&md2, passwd, passwd_len);
 369                 EVP_DigestUpdate(&md2, (i & 1) ? buf : (unsigned const char *) passwd,
 370                                        (i & 1) ? sizeof buf : passwd_len);
 371                 EVP_DigestFinal_ex(&md2, buf, NULL);
 372                 }
 373         EVP_MD_CTX_cleanup(&md2);
 374
 375          {
 376                 /* transform buf into output string */
 377
 378                 unsigned char buf_perm[sizeof buf];
 379                 int dest, source;
 380                 char *output;
 381
 382                 /* silly output permutation */
 383                 for (dest = 0, source = 0; dest < 14; dest++, source = (source + 6) % 17)
 384                         buf_perm[dest] = buf[source];
 385                 buf_perm[14] = buf[5];
 386                 buf_perm[15] = buf[11];
 387 #ifndef PEDANTIC /* Unfortunately, this generates a "no effect" warning */
 388                 assert(16 == sizeof buf_perm);
 389 #endif
 390
 391                 output = salt_out + salt_len;
 392                 assert(output == out_buf + strlen(out_buf));
 393
 394                 *output++ = '$';
 395
 396                 for (i = 0; i < 15; i += 3)
 397                         {
 398                         *output++ = cov_2char[buf_perm[i+2] & 0x3f];
 399                         *output++ = cov_2char[((buf_perm[i+1] & 0xf) << 2) |
 400                                                   (buf_perm[i+2] >> 6)];
 401                         *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
 402                                                   (buf_perm[i+1] >> 4)];
 403                         *output++ = cov_2char[buf_perm[i] >> 2];
 404                         }
 405                 assert(i == 15);
 406                 *output++ = cov_2char[buf_perm[i] & 0x3f];
 407                 *output++ = cov_2char[buf_perm[i] >> 6];
 408                 *output = 0;
 409                 assert(strlen(out_buf) < sizeof(out_buf));
 410          }
 411         EVP_MD_CTX_cleanup(&md);
 412
 413         return out_buf;
 414         }
 415 #endif
 416
 417
 418 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
 419         char *passwd, BIO *out, int quiet, int table, int reverse,
 420         size_t pw_maxlen, int usecrypt, int use1, int useapr1)
 421         {
 422         char *hash = NULL;
 423
 424         assert(salt_p != NULL);
 425         assert(salt_malloc_p != NULL);
 426
 427         /* first make sure we have a salt */
 428         if (!passed_salt)
 429                 {
 430 #ifndef OPENSSL_NO_DES
 431                 if (usecrypt)
 432                         {
 433                         if (*salt_malloc_p == NULL)
 434                                 {
 435                                 *salt_p = *salt_malloc_p = OPENSSL_malloc(3);
 436                                 if (*salt_malloc_p == NULL)
 437                                         goto err;
 438                                 }
 439                         if (RAND_pseudo_bytes((unsigned char *)*salt_p, 2) < 0)
 440                                 goto err;
 441                         (*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
 442                         (*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
 443                         (*salt_p)[2] = 0;
 444 #ifdef CHARSET_EBCDIC
 445                         ascii2ebcdic(*salt_p, *salt_p, 2); /* des_crypt will convert
 446                                                             * back to ASCII */
 447 #endif
 448                         }
 449 #endif /* !OPENSSL_NO_DES */
 450
 451 #ifndef NO_MD5CRYPT_1
 452                 if (use1 || useapr1)
 453                         {
 454                         int i;
 455
 456                         if (*salt_malloc_p == NULL)
 457                                 {
 458                                 *salt_p = *salt_malloc_p = OPENSSL_malloc(9);
 459                                 if (*salt_malloc_p == NULL)
 460                                         goto err;
 461                                 }
 462                         if (RAND_pseudo_bytes((unsigned char *)*salt_p, 8) < 0)
 463                                 goto err;
 464
 465                         for (i = 0; i < 8; i++)
 466                                 (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 467                         (*salt_p)[8] = 0;
 468                         }
 469 #endif /* !NO_MD5CRYPT_1 */
 470                 }
 471
 472         assert(*salt_p != NULL);
 473
 474         /* truncate password if necessary */
 475         if ((strlen(passwd) > pw_maxlen))
 476                 {
 477                 if (!quiet)
 478                         /* XXX: really we should know how to print a size_t, not cast it */
 479                         BIO_printf(bio_err, "Warning: truncating password to %u characters\n", (unsigned)pw_maxlen);
 480                 passwd[pw_maxlen] = 0;
 481                 }
 482         assert(strlen(passwd) <= pw_maxlen);
 483
 484         /* now compute password hash */
 485 #ifndef OPENSSL_NO_DES
 486         if (usecrypt)
 487                 hash = DES_crypt(passwd, *salt_p);
 488 #endif
 489 #ifndef NO_MD5CRYPT_1
 490         if (use1 || useapr1)
 491                 hash = md5crypt(passwd, (use1 ? "1" : "apr1"), *salt_p);
 492 #endif
 493         assert(hash != NULL);
 494
 495         if (table && !reverse)
 496                 BIO_printf(out, "%s\t%s\n", passwd, hash);
 497         else if (table && reverse)
 498                 BIO_printf(out, "%s\t%s\n", hash, passwd);
 499         else
 500                 BIO_printf(out, "%s\n", hash);
 501         return 1;
 502
 503 err:
 504         return 0;
 505         }
 506 #else
 507
 508 int MAIN(int argc, char **argv)
 509         {
 510         fputs("Program not available.\n", stderr)
 511         OPENSSL_EXIT(1);
 512         }
 513 #endif