apps/passwd.c

   1 /* apps/passwd.c */
   2
   3 #if defined NO_MD5 || defined CHARSET_EBCDIC
   4 # define NO_APR1
   5 #endif
   6
   7 #if !defined(NO_DES) || !defined(NO_APR1)
   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_APR1
  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 useapr1);
  46
  47 /* -crypt        - standard Unix password algorithm (default, only choice)
  48  * -apr1         - MD5-based password algorithm
  49  * -salt string  - salt
  50  * -in file      - read passwords from file
  51  * -stdin        - read passwords from stdin
  52  * -quiet        - no warnings
  53  * -table        - format output as table
  54  * -reverse      - switch table columns
  55  */
  56
  57 int MAIN(int argc, char **argv)
  58         {
  59         int ret = 1;
  60         char *infile = NULL;
  61         int in_stdin = 0;
  62         char *salt = NULL, *passwd = NULL, **passwds = NULL;
  63         char *salt_malloc = NULL, *passwd_malloc = NULL;
  64         int pw_source_defined = 0;
  65         BIO *in = NULL, *out = NULL;
  66         int i, badopt, opt_done;
  67         int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
  68         int usecrypt = 0, useapr1 = 0;
  69         size_t pw_maxlen = 0;
  70
  71         apps_startup();
  72
  73         if (bio_err == NULL)
  74                 if ((bio_err=BIO_new(BIO_s_file())) != NULL)
  75                         BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
  76         out = BIO_new(BIO_s_file());
  77         if (out == NULL)
  78                 goto err;
  79         BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
  80
  81         badopt = 0, opt_done = 0;
  82         i = 0;
  83         while (!badopt && !opt_done && argv[++i] != NULL)
  84                 {
  85                 if (strcmp(argv[i], "-crypt") == 0)
  86                         usecrypt = 1;
  87                 else if (strcmp(argv[i], "-apr1") == 0)
  88                         useapr1 = 1;
  89                 else if (strcmp(argv[i], "-salt") == 0)
  90                         {
  91                         if ((argv[i+1] != NULL) && (salt == NULL))
  92                                 {
  93                                 passed_salt = 1;
  94                                 salt = argv[++i];
  95                                 }
  96                         else
  97                                 badopt = 1;
  98                         }
  99                 else if (strcmp(argv[i], "-in") == 0)
 100                         {
 101                         if ((argv[i+1] != NULL) && !pw_source_defined)
 102                                 {
 103                                 pw_source_defined = 1;
 104                                 infile = argv[++i];
 105                                 }
 106                         else
 107                                 badopt = 1;
 108                         }
 109                 else if (strcmp(argv[i], "-stdin") == 0)
 110                         {
 111                         if (!pw_source_defined)
 112                                 {
 113                                 pw_source_defined = 1;
 114                                 in_stdin = 1;
 115                                 }
 116                         else
 117                                 badopt = 1;
 118                         }
 119                 else if (strcmp(argv[i], "-quiet") == 0)
 120                         quiet = 1;
 121                 else if (strcmp(argv[i], "-table") == 0)
 122                         table = 1;
 123                 else if (strcmp(argv[i], "-reverse") == 0)
 124                         reverse = 1;
 125                 else if (argv[i][0] == '-')
 126                         badopt = 1;
 127                 else if (!pw_source_defined)
 128                         /* non-option arguments, use as passwords */
 129                         {
 130                         pw_source_defined = 1;
 131                         passwds = &argv[i];
 132                         opt_done = 1;
 133                         }
 134                 else
 135                         badopt = 1;
 136                 }
 137
 138         if (!usecrypt && !useapr1) /* use default */
 139                 usecrypt = 1;
 140         if (usecrypt + useapr1 > 1) /* conflict */
 141                 badopt = 1;
 142
 143         /* reject unsupported algorithms */
 144 #ifdef NO_DES
 145         if (usecrypt) badopt = 1;
 146 #endif
 147 #ifdef NO_APR1
 148         if (useapr1) badopt = 1;
 149 #endif
 150
 151         if (badopt)
 152                 {
 153                 BIO_printf(bio_err, "Usage: passwd [options] [passwords]\n");
 154                 BIO_printf(bio_err, "where options are\n");
 155 #ifndef NO_DES
 156                 BIO_printf(bio_err, "-crypt             standard Unix password algorithm (default)\n");
 157 #endif
 158 #ifndef NO_APR1
 159                 BIO_printf(bio_err, "-apr1              MD5-based password algorithm\n");
 160 #endif
 161                 BIO_printf(bio_err, "-salt string       use provided salt\n");
 162                 BIO_printf(bio_err, "-in file           read passwords from file\n");
 163                 BIO_printf(bio_err, "-stdin             read passwords from stdin\n");
 164                 BIO_printf(bio_err, "-quiet             no warnings\n");
 165                 BIO_printf(bio_err, "-table             format output as table\n");
 166                 BIO_printf(bio_err, "-reverse           switch table columns\n");
 167
 168                 goto err;
 169                 }
 170
 171         if ((infile != NULL) || in_stdin)
 172                 {
 173                 in = BIO_new(BIO_s_file());
 174                 if (in == NULL)
 175                         goto err;
 176                 if (infile != NULL)
 177                         {
 178                         assert(in_stdin == 0);
 179                         if (BIO_read_filename(in, infile) <= 0)
 180                                 goto err;
 181                         }
 182                 else
 183                         {
 184                         assert(in_stdin);
 185                         BIO_set_fp(in, stdin, BIO_NOCLOSE);
 186                         }
 187                 }
 188
 189         if (usecrypt)
 190                 pw_maxlen = 8;
 191         else if (useapr1)
 192                 pw_maxlen = 256; /* arbitrary limit, should be enough for most passwords */
 193
 194         if (passwds == NULL)
 195                 {
 196                 /* no passwords on the command line */
 197                 passwd = passwd_malloc = Malloc(pw_maxlen + 1);
 198                 if (passwd_malloc == NULL)
 199                         goto err;
 200                 }
 201
 202         if ((in == NULL) && (passwds == NULL))
 203                 {
 204                 /* build a null-terminated list */
 205                 static char *passwds_static[2] = {NULL, NULL};
 206
 207                 passwds = passwds_static;
 208                 if (in == NULL)
 209                         if (EVP_read_pw_string(passwd_malloc, pw_maxlen + 1, "Password: ", 0) != 0)
 210                                 goto err;
 211                 passwds[0] = passwd_malloc;
 212                 }
 213
 214         if (in == NULL)
 215                 {
 216                 assert(passwds != NULL);
 217                 assert(*passwds != NULL);
 218
 219                 do /* loop over list of passwords */
 220                         {
 221                         passwd = *passwds++;
 222                         if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
 223                                 quiet, table, reverse, pw_maxlen, usecrypt, useapr1))
 224                                 goto err;
 225                         }
 226                 while (*passwds != NULL);
 227                 }
 228         else
 229                 /* in != NULL */
 230                 {
 231                 int done;
 232
 233                 assert (passwd != NULL);
 234                 do
 235                         {
 236                         int r = BIO_gets(in, passwd, pw_maxlen + 1);
 237                         if (r > 0)
 238                                 {
 239                                 char *c = (strchr(passwd, '\n')) ;
 240                                 if (c != NULL)
 241                                         *c = 0; /* truncate at newline */
 242                                 else
 243                                         {
 244                                         /* ignore rest of line */
 245                                         char trash[BUFSIZ];
 246                                         do
 247                                                 r = BIO_gets(in, trash, sizeof trash);
 248                                         while ((r > 0) && (!strchr(trash, '\n')));
 249                                         }
 250
 251                                 if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
 252                                         quiet, table, reverse, pw_maxlen, usecrypt, useapr1))
 253                                         goto err;
 254                                 }
 255                         done = (r <= 0);
 256                         }
 257                 while (!done);
 258                 }
 259
 260 err:
 261         ERR_print_errors(bio_err);
 262         if (salt_malloc)
 263                 Free(salt_malloc);
 264         if (passwd_malloc)
 265                 Free(passwd_malloc);
 266         if (in)
 267                 BIO_free(in);
 268         if (out)
 269                 BIO_free(out);
 270         EXIT(ret);
 271         }
 272
 273
 274 #ifndef NO_APR1
 275 /* MD5-based password algorithm compatible to the one found in Apache
 276  * (should probably be available as a library function;
 277  * then the static buffer would not be acceptable) */
 278 static char *apr1_crypt(const char *passwd, const char *salt)
 279         {
 280         static char out_buf[6 + 9 + 24 + 2]; /* "$apr1$..salt..$.......md5hash..........\0" */
 281         unsigned char buf[MD5_DIGEST_LENGTH];
 282         char *salt_out;
 283         int n, i;
 284         MD5_CTX md;
 285         size_t passwd_len, salt_len;
 286
 287         passwd_len = strlen(passwd);
 288         strcpy(out_buf, "$apr1$");
 289         strncat(out_buf, salt, 8);
 290         assert(strlen(out_buf) <= 6 + 8); /* "$apr1$..salt.." */
 291         salt_out = out_buf + 6;
 292         salt_len = strlen(salt_out);
 293         assert(salt_len <= 8);
 294
 295         MD5_Init(&md);
 296         MD5_Update(&md, passwd, passwd_len);
 297         MD5_Update(&md, "$apr1$", 6);
 298         MD5_Update(&md, salt_out, salt_len);
 299
 300          {
 301                 MD5_CTX md2;
 302
 303                 MD5_Init(&md2);
 304                 MD5_Update(&md2, passwd, passwd_len);
 305                 MD5_Update(&md2, salt_out, salt_len);
 306                 MD5_Update(&md2, passwd, passwd_len);
 307                 MD5_Final(buf, &md2);
 308          }
 309         for (i = passwd_len; i > sizeof buf; i -= sizeof buf)
 310                 MD5_Update(&md, buf, sizeof buf);
 311         MD5_Update(&md, buf, i);
 312
 313         n = passwd_len;
 314         while (n)
 315                 {
 316                 MD5_Update(&md, (n & 1) ? "\0" : passwd, 1);
 317                 n >>= 1;
 318                 }
 319         MD5_Final(buf, &md);
 320
 321         for (i = 0; i < 1000; i++)
 322                 {
 323                 MD5_CTX md2;
 324
 325                 MD5_Init(&md2);
 326                 MD5_Update(&md2, (i & 1) ? (unsigned char *) passwd : buf,
 327                                  (i & 1) ? passwd_len : sizeof buf);
 328                 if (i % 3)
 329                         MD5_Update(&md2, salt_out, salt_len);
 330                 if (i % 7)
 331                         MD5_Update(&md2, passwd, passwd_len);
 332                 MD5_Update(&md2, (i & 1) ? buf : (unsigned char *) passwd,
 333                                  (i & 1) ? sizeof buf : passwd_len);
 334                 MD5_Final(buf, &md2);
 335                 }
 336
 337          {
 338                 /* transform buf into output string */
 339
 340                 unsigned char buf_perm[sizeof buf];
 341                 int dest, source;
 342                 char *output;
 343
 344                 /* silly output permutation */
 345                 for (dest = 0, source = 0; dest < 14; dest++, source = (source + 6) % 17)
 346                         buf_perm[dest] = buf[source];
 347                 buf_perm[14] = buf[5];
 348                 buf_perm[15] = buf[11];
 349 #ifndef PEDANTIC /* Unfortunately, this generates a "no effect" warning */
 350                 assert(16 == sizeof buf_perm);
 351 #endif
 352
 353                 output = salt_out + salt_len;
 354                 assert(output == out_buf + strlen(out_buf));
 355
 356                 *output++ = '$';
 357
 358                 for (i = 0; i < 15; i += 3)
 359                         {
 360                         *output++ = cov_2char[buf_perm[i+2] & 0x3f];
 361                         *output++ = cov_2char[((buf_perm[i+1] & 0xf) << 2) |
 362                                                   (buf_perm[i+2] >> 6)];
 363                         *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
 364                                                   (buf_perm[i+1] >> 4)];
 365                         *output++ = cov_2char[buf_perm[i] >> 2];
 366                         }
 367                 assert(i == 15);
 368                 *output++ = cov_2char[buf_perm[i] & 0x3f];
 369                 *output++ = cov_2char[buf_perm[i] >> 6];
 370                 *output = 0;
 371                 assert(strlen(out_buf) < sizeof(out_buf));
 372          }
 373
 374         return out_buf;
 375         }
 376 #endif
 377
 378
 379 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
 380         char *passwd, BIO *out, int quiet, int table, int reverse,
 381         size_t pw_maxlen, int usecrypt, int useapr1)
 382         {
 383         char *hash = NULL;
 384
 385         assert(salt_p != NULL);
 386         assert(salt_malloc_p != NULL);
 387
 388         /* first make sure we have a salt */
 389         if (!passed_salt)
 390                 {
 391 #ifndef NO_DES
 392                 if (usecrypt)
 393                         {
 394                         if (*salt_malloc_p == NULL)
 395                                 {
 396                                 *salt_p = *salt_malloc_p = Malloc(3);
 397                                 if (*salt_malloc_p == NULL)
 398                                         goto err;
 399                                 }
 400                         if (RAND_pseudo_bytes((unsigned char *)*salt_p, 2) < 0)
 401                                 goto err;
 402                         (*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
 403                         (*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
 404                         (*salt_p)[2] = 0;
 405 #ifdef CHARSET_EBCDIC
 406                         ascii2ebcdic(*salt_p, *salt_p, 2); /* des_crypt will convert
 407                                                             * back to ASCII */
 408 #endif
 409                         }
 410 #endif /* !NO_DES */
 411
 412 #ifndef NO_APR1
 413                 if (useapr1)
 414                         {
 415                         int i;
 416
 417                         if (*salt_malloc_p == NULL)
 418                                 {
 419                                 *salt_p = *salt_malloc_p = Malloc(9);
 420                                 if (*salt_malloc_p == NULL)
 421                                         goto err;
 422                                 }
 423                         if (RAND_pseudo_bytes((unsigned char *)*salt_p, 8) < 0)
 424                                 goto err;
 425
 426                         for (i = 0; i < 8; i++)
 427                                 (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 428                         (*salt_p)[8] = 0;
 429                         }
 430 #endif /* !NO_APR1 */
 431                 }
 432
 433         assert(*salt_p != NULL);
 434
 435         /* truncate password if necessary */
 436         if ((strlen(passwd) > pw_maxlen))
 437                 {
 438                 if (!quiet)
 439                         BIO_printf(bio_err, "Warning: truncating password to %u characters\n", pw_maxlen);
 440                 passwd[pw_maxlen] = 0;
 441                 }
 442         assert(strlen(passwd) <= pw_maxlen);
 443
 444         /* now compute password hash */
 445 #ifndef NO_DES
 446         if (usecrypt)
 447                 hash = des_crypt(passwd, *salt_p);
 448 #endif
 449 #ifndef NO_APR1
 450         if (useapr1)
 451                 hash = apr1_crypt(passwd, *salt_p);
 452 #endif
 453         assert(hash != NULL);
 454
 455         if (table && !reverse)
 456                 BIO_printf(out, "%s\t%s\n", passwd, hash);
 457         else if (table && reverse)
 458                 BIO_printf(out, "%s\t%s\n", hash, passwd);
 459         else
 460                 BIO_printf(out, "%s\n", hash);
 461         return 1;
 462
 463 err:
 464         return 0;
 465         }
 466 #else
 467
 468 int MAIN(int argc, char **argv)
 469         {
 470         fputs("Program not available.\n", stderr)
 471         EXIT(1);
 472         }
 473 #endif