apps/passwd.c

   1 /* apps/passwd.c */
   2
   3 #if defined NO_MD5 || defined CHARSET_EBCDIC
   4 # define NO_MD5CRYPT_1
   5 #endif
   6
   7 #if !defined(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
  19 #ifndef NO_DES
  20 # include <openssl/des.h>
  21 #endif
  22 #ifndef NO_MD5CRYPT_1
  23 # include <openssl/md5.h>
  24 #endif
  25
  26
  27 #undef PROG
  28 #define PROG passwd_main
  29
  30
  31 static unsigned const char cov_2char[64]={
  32         /* from crypto/des/fcrypt.c */
  33         0x2E,0x2F,0x30,0x31,0x32,0x33,0x34,0x35,
  34         0x36,0x37,0x38,0x39,0x41,0x42,0x43,0x44,
  35         0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,
  36         0x4D,0x4E,0x4F,0x50,0x51,0x52,0x53,0x54,
  37         0x55,0x56,0x57,0x58,0x59,0x5A,0x61,0x62,
  38         0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,
  39         0x6B,0x6C,0x6D,0x6E,0x6F,0x70,0x71,0x72,
  40         0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A
  41 };
  42
  43 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
  44         char *passwd, BIO *out, int quiet, int table, int reverse,
  45         size_t pw_maxlen, int usecrypt, int use1, int useapr1);
  46
  47 /* -crypt        - standard Unix password algorithm (default, only choice)
  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  * -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         char *salt = NULL, *passwd = NULL, **passwds = NULL;
  66         char *salt_malloc = NULL, *passwd_malloc = NULL;
  67         size_t passwd_malloc_size = 0;
  68         int pw_source_defined = 0;
  69         BIO *in = NULL, *out = NULL;
  70         int i, badopt, opt_done;
  71         int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
  72         int usecrypt = 0, use1 = 0, useapr1 = 0;
  73         size_t pw_maxlen = 0;
  74
  75         apps_startup();
  76
  77         if (bio_err == NULL)
  78                 if ((bio_err=BIO_new(BIO_s_file())) != NULL)
  79                         BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
  80         out = BIO_new(BIO_s_file());
  81         if (out == NULL)
  82                 goto err;
  83         BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
  84
  85         badopt = 0, opt_done = 0;
  86         i = 0;
  87         while (!badopt && !opt_done && argv[++i] != NULL)
  88                 {
  89                 if (strcmp(argv[i], "-crypt") == 0)
  90                         usecrypt = 1;
  91                 else if (strcmp(argv[i], "-1") == 0)
  92                         use1 = 1;
  93                 else if (strcmp(argv[i], "-apr1") == 0)
  94                         useapr1 = 1;
  95                 else if (strcmp(argv[i], "-salt") == 0)
  96                         {
  97                         if ((argv[i+1] != NULL) && (salt == NULL))
  98                                 {
  99                                 passed_salt = 1;
 100                                 salt = argv[++i];
 101                                 }
 102                         else
 103                                 badopt = 1;
 104                         }
 105                 else if (strcmp(argv[i], "-in") == 0)
 106                         {
 107                         if ((argv[i+1] != NULL) && !pw_source_defined)
 108                                 {
 109                                 pw_source_defined = 1;
 110                                 infile = argv[++i];
 111                                 }
 112                         else
 113                                 badopt = 1;
 114                         }
 115                 else if (strcmp(argv[i], "-stdin") == 0)
 116                         {
 117                         if (!pw_source_defined)
 118                                 {
 119                                 pw_source_defined = 1;
 120                                 in_stdin = 1;
 121                                 }
 122                         else
 123                                 badopt = 1;
 124                         }
 125                 else if (strcmp(argv[i], "-quiet") == 0)
 126                         quiet = 1;
 127                 else if (strcmp(argv[i], "-table") == 0)
 128                         table = 1;
 129                 else if (strcmp(argv[i], "-reverse") == 0)
 130                         reverse = 1;
 131                 else if (argv[i][0] == '-')
 132                         badopt = 1;
 133                 else if (!pw_source_defined)
 134                         /* non-option arguments, use as passwords */
 135                         {
 136                         pw_source_defined = 1;
 137                         passwds = &argv[i];
 138                         opt_done = 1;
 139                         }
 140                 else
 141                         badopt = 1;
 142                 }
 143
 144         if (!usecrypt && !use1 && !useapr1) /* use default */
 145                 usecrypt = 1;
 146         if (usecrypt + use1 + useapr1 > 1) /* conflict */
 147                 badopt = 1;
 148
 149         /* reject unsupported algorithms */
 150 #ifdef NO_DES
 151         if (usecrypt) badopt = 1;
 152 #endif
 153 #ifdef NO_MD5CRYPT_1
 154         if (use1 || useapr1) badopt = 1;
 155 #endif
 156
 157         if (badopt)
 158                 {
 159                 BIO_printf(bio_err, "Usage: passwd [options] [passwords]\n");
 160                 BIO_printf(bio_err, "where options are\n");
 161 #ifndef NO_DES
 162                 BIO_printf(bio_err, "-crypt             standard Unix password algorithm (default)\n");
 163 #endif
 164 #ifndef NO_MD5CRYPT_1
 165                 BIO_printf(bio_err, "-1                 MD5-based password algorithm\n");
 166                 BIO_printf(bio_err, "-apr1              MD5-based password algorithm, Apache variant\n");
 167 #endif
 168                 BIO_printf(bio_err, "-salt string       use provided salt\n");
 169                 BIO_printf(bio_err, "-in file           read passwords from file\n");
 170                 BIO_printf(bio_err, "-stdin             read passwords from stdin\n");
 171                 BIO_printf(bio_err, "-quiet             no warnings\n");
 172                 BIO_printf(bio_err, "-table             format output as table\n");
 173                 BIO_printf(bio_err, "-reverse           switch table columns\n");
 174
 175                 goto err;
 176                 }
 177
 178         if ((infile != NULL) || in_stdin)
 179                 {
 180                 in = BIO_new(BIO_s_file());
 181                 if (in == NULL)
 182                         goto err;
 183                 if (infile != NULL)
 184                         {
 185                         assert(in_stdin == 0);
 186                         if (BIO_read_filename(in, infile) <= 0)
 187                                 goto err;
 188                         }
 189                 else
 190                         {
 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 passwords */
 200
 201         if (passwds == NULL)
 202                 {
 203                 /* no passwords on the command line */
 204
 205                 passwd_malloc_size = pw_maxlen + 2;
 206                 /* longer than necessary so that we can warn about truncation */
 207                 passwd = passwd_malloc = OPENSSL_malloc(passwd_malloc_size);
 208                 if (passwd_malloc == NULL)
 209                         goto err;
 210                 }
 211
 212         if ((in == NULL) && (passwds == NULL))
 213                 {
 214                 /* build a null-terminated list */
 215                 static char *passwds_static[2] = {NULL, NULL};
 216
 217                 passwds = passwds_static;
 218                 if (in == NULL)
 219                         if (EVP_read_pw_string(passwd_malloc, passwd_malloc_size, "Password: ", 0) != 0)
 220                                 goto err;
 221                 passwds[0] = passwd_malloc;
 222                 }
 223
 224         if (in == NULL)
 225                 {
 226                 assert(passwds != NULL);
 227                 assert(*passwds != NULL);
 228
 229                 do /* loop over list of passwords */
 230                         {
 231                         passwd = *passwds++;
 232                         if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
 233                                 quiet, table, reverse, pw_maxlen, usecrypt, use1, useapr1))
 234                                 goto err;
 235                         }
 236                 while (*passwds != NULL);
 237                 }
 238         else
 239                 /* in != NULL */
 240                 {
 241                 int done;
 242
 243                 assert (passwd != NULL);
 244                 do
 245                         {
 246                         int r = BIO_gets(in, passwd, pw_maxlen + 1);
 247                         if (r > 0)
 248                                 {
 249                                 char *c = (strchr(passwd, '\n')) ;
 250                                 if (c != NULL)
 251                                         *c = 0; /* truncate at newline */
 252                                 else
 253                                         {
 254                                         /* ignore rest of line */
 255                                         char trash[BUFSIZ];
 256                                         do
 257                                                 r = BIO_gets(in, trash, sizeof trash);
 258                                         while ((r > 0) && (!strchr(trash, '\n')));
 259                                         }
 260
 261                                 if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
 262                                         quiet, table, reverse, pw_maxlen, usecrypt, use1, useapr1))
 263                                         goto err;
 264                                 }
 265                         done = (r <= 0);
 266                         }
 267                 while (!done);
 268                 }
 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(out);
 280         EXIT(ret);
 281         }
 282
 283
 284 #ifndef NO_MD5CRYPT_1
 285 /* MD5-based password algorithm (should probably be available as a library
 286  * function; then the static buffer would not be acceptable).
 287  * For magic string "1", this should be compatible to the MD5-based BSD
 288  * password algorithm.
 289  * For 'magic' string "apr1", this is compatible to the MD5-based Apache
 290  * password algorithm.
 291  * (Apparently, the Apache password algorithm is identical except that the
 292  * 'magic' string was changed -- the laziest application of the NIH principle
 293  * I've ever encountered.)
 294  */
 295 static char *md5crypt(const char *passwd, const char *magic, const char *salt)
 296         {
 297         static char out_buf[6 + 9 + 24 + 2]; /* "$apr1$..salt..$.......md5hash..........\0" */
 298         unsigned char buf[MD5_DIGEST_LENGTH];
 299         char *salt_out;
 300         int n, i;
 301         MD5_CTX md;
 302         size_t passwd_len, salt_len;
 303
 304         passwd_len = strlen(passwd);
 305         out_buf[0] = '$';
 306         out_buf[1] = 0;
 307         assert(strlen(magic) <= 4); /* "1" or "apr1" */
 308         strncat(out_buf, magic, 4);
 309         strncat(out_buf, "$", 1);
 310         strncat(out_buf, salt, 8);
 311         assert(strlen(out_buf) <= 6 + 8); /* "$apr1$..salt.." */
 312         salt_out = out_buf + 6;
 313         salt_len = strlen(salt_out);
 314         assert(salt_len <= 8);
 315
 316         MD5_Init(&md);
 317         MD5_Update(&md, passwd, passwd_len);
 318         MD5_Update(&md, "$", 1);
 319         MD5_Update(&md, magic, strlen(magic));
 320         MD5_Update(&md, "$", 1);
 321         MD5_Update(&md, salt_out, salt_len);
 322
 323          {
 324                 MD5_CTX md2;
 325
 326                 MD5_Init(&md2);
 327                 MD5_Update(&md2, passwd, passwd_len);
 328                 MD5_Update(&md2, salt_out, salt_len);
 329                 MD5_Update(&md2, passwd, passwd_len);
 330                 MD5_Final(buf, &md2);
 331          }
 332         for (i = passwd_len; i > sizeof buf; i -= sizeof buf)
 333                 MD5_Update(&md, buf, sizeof buf);
 334         MD5_Update(&md, buf, i);
 335
 336         n = passwd_len;
 337         while (n)
 338                 {
 339                 MD5_Update(&md, (n & 1) ? "\0" : passwd, 1);
 340                 n >>= 1;
 341                 }
 342         MD5_Final(buf, &md);
 343
 344         for (i = 0; i < 1000; i++)
 345                 {
 346                 MD5_CTX md2;
 347
 348                 MD5_Init(&md2);
 349                 MD5_Update(&md2, (i & 1) ? (unsigned char *) passwd : buf,
 350                                  (i & 1) ? passwd_len : sizeof buf);
 351                 if (i % 3)
 352                         MD5_Update(&md2, salt_out, salt_len);
 353                 if (i % 7)
 354                         MD5_Update(&md2, passwd, passwd_len);
 355                 MD5_Update(&md2, (i & 1) ? buf : (unsigned char *) passwd,
 356                                  (i & 1) ? sizeof buf : passwd_len);
 357                 MD5_Final(buf, &md2);
 358                 }
 359
 360          {
 361                 /* transform buf into output string */
 362
 363                 unsigned char buf_perm[sizeof buf];
 364                 int dest, source;
 365                 char *output;
 366
 367                 /* silly output permutation */
 368                 for (dest = 0, source = 0; dest < 14; dest++, source = (source + 6) % 17)
 369                         buf_perm[dest] = buf[source];
 370                 buf_perm[14] = buf[5];
 371                 buf_perm[15] = buf[11];
 372 #ifndef PEDANTIC /* Unfortunately, this generates a "no effect" warning */
 373                 assert(16 == sizeof buf_perm);
 374 #endif
 375
 376                 output = salt_out + salt_len;
 377                 assert(output == out_buf + strlen(out_buf));
 378
 379                 *output++ = '$';
 380
 381                 for (i = 0; i < 15; i += 3)
 382                         {
 383                         *output++ = cov_2char[buf_perm[i+2] & 0x3f];
 384                         *output++ = cov_2char[((buf_perm[i+1] & 0xf) << 2) |
 385                                                   (buf_perm[i+2] >> 6)];
 386                         *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
 387                                                   (buf_perm[i+1] >> 4)];
 388                         *output++ = cov_2char[buf_perm[i] >> 2];
 389                         }
 390                 assert(i == 15);
 391                 *output++ = cov_2char[buf_perm[i] & 0x3f];
 392                 *output++ = cov_2char[buf_perm[i] >> 6];
 393                 *output = 0;
 394                 assert(strlen(out_buf) < sizeof(out_buf));
 395          }
 396
 397         return out_buf;
 398         }
 399 #endif
 400
 401
 402 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
 403         char *passwd, BIO *out, int quiet, int table, int reverse,
 404         size_t pw_maxlen, int usecrypt, int use1, int useapr1)
 405         {
 406         char *hash = NULL;
 407
 408         assert(salt_p != NULL);
 409         assert(salt_malloc_p != NULL);
 410
 411         /* first make sure we have a salt */
 412         if (!passed_salt)
 413                 {
 414 #ifndef NO_DES
 415                 if (usecrypt)
 416                         {
 417                         if (*salt_malloc_p == NULL)
 418                                 {
 419                                 *salt_p = *salt_malloc_p = OPENSSL_malloc(3);
 420                                 if (*salt_malloc_p == NULL)
 421                                         goto err;
 422                                 }
 423                         if (RAND_pseudo_bytes((unsigned char *)*salt_p, 2) < 0)
 424                                 goto err;
 425                         (*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
 426                         (*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
 427                         (*salt_p)[2] = 0;
 428 #ifdef CHARSET_EBCDIC
 429                         ascii2ebcdic(*salt_p, *salt_p, 2); /* des_crypt will convert
 430                                                             * back to ASCII */
 431 #endif
 432                         }
 433 #endif /* !NO_DES */
 434
 435 #ifndef NO_MD5CRYPT_1
 436                 if (use1 || useapr1)
 437                         {
 438                         int i;
 439
 440                         if (*salt_malloc_p == NULL)
 441                                 {
 442                                 *salt_p = *salt_malloc_p = OPENSSL_malloc(9);
 443                                 if (*salt_malloc_p == NULL)
 444                                         goto err;
 445                                 }
 446                         if (RAND_pseudo_bytes((unsigned char *)*salt_p, 8) < 0)
 447                                 goto err;
 448
 449                         for (i = 0; i < 8; i++)
 450                                 (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 451                         (*salt_p)[8] = 0;
 452                         }
 453 #endif /* !NO_MD5CRYPT_1 */
 454                 }
 455
 456         assert(*salt_p != NULL);
 457
 458         /* truncate password if necessary */
 459         if ((strlen(passwd) > pw_maxlen))
 460                 {
 461                 if (!quiet)
 462                         BIO_printf(bio_err, "Warning: truncating password to %u characters\n", pw_maxlen);
 463                 passwd[pw_maxlen] = 0;
 464                 }
 465         assert(strlen(passwd) <= pw_maxlen);
 466
 467         /* now compute password hash */
 468 #ifndef NO_DES
 469         if (usecrypt)
 470                 hash = des_crypt(passwd, *salt_p);
 471 #endif
 472 #ifndef NO_MD5CRYPT_1
 473         if (use1 || useapr1)
 474                 hash = md5crypt(passwd, (use1 ? "1" : "apr1"), *salt_p);
 475 #endif
 476         assert(hash != NULL);
 477
 478         if (table && !reverse)
 479                 BIO_printf(out, "%s\t%s\n", passwd, hash);
 480         else if (table && reverse)
 481                 BIO_printf(out, "%s\t%s\n", hash, passwd);
 482         else
 483                 BIO_printf(out, "%s\n", hash);
 484         return 1;
 485
 486 err:
 487         return 0;
 488         }
 489 #else
 490
 491 int MAIN(int argc, char **argv)
 492         {
 493         fputs("Program not available.\n", stderr)
 494         EXIT(1);
 495         }
 496 #endif