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, char **);
  58
  59 int MAIN(int argc, char **argv)
  60         {
  61         int ret = 1;
  62         char *infile = NULL;
  63         int in_stdin = 0;
  64         char *salt = NULL, *passwd = NULL, **passwds = NULL;
  65         char *salt_malloc = NULL, *passwd_malloc = NULL;
  66         size_t passwd_malloc_size = 0;
  67         int pw_source_defined = 0;
  68         BIO *in = NULL, *out = NULL;
  69         int i, badopt, opt_done;
  70         int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
  71         int usecrypt = 0, useapr1 = 0;
  72         size_t pw_maxlen = 0;
  73
  74         apps_startup();
  75
  76         if (bio_err == NULL)
  77                 if ((bio_err=BIO_new(BIO_s_file())) != NULL)
  78                         BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
  79         out = BIO_new(BIO_s_file());
  80         if (out == NULL)
  81                 goto err;
  82         BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
  83
  84         badopt = 0, opt_done = 0;
  85         i = 0;
  86         while (!badopt && !opt_done && argv[++i] != NULL)
  87                 {
  88                 if (strcmp(argv[i], "-crypt") == 0)
  89                         usecrypt = 1;
  90                 else if (strcmp(argv[i], "-apr1") == 0)
  91                         useapr1 = 1;
  92                 else if (strcmp(argv[i], "-salt") == 0)
  93                         {
  94                         if ((argv[i+1] != NULL) && (salt == NULL))
  95                                 {
  96                                 passed_salt = 1;
  97                                 salt = argv[++i];
  98                                 }
  99                         else
 100                                 badopt = 1;
 101                         }
 102                 else if (strcmp(argv[i], "-in") == 0)
 103                         {
 104                         if ((argv[i+1] != NULL) && !pw_source_defined)
 105                                 {
 106                                 pw_source_defined = 1;
 107                                 infile = argv[++i];
 108                                 }
 109                         else
 110                                 badopt = 1;
 111                         }
 112                 else if (strcmp(argv[i], "-stdin") == 0)
 113                         {
 114                         if (!pw_source_defined)
 115                                 {
 116                                 pw_source_defined = 1;
 117                                 in_stdin = 1;
 118                                 }
 119                         else
 120                                 badopt = 1;
 121                         }
 122                 else if (strcmp(argv[i], "-quiet") == 0)
 123                         quiet = 1;
 124                 else if (strcmp(argv[i], "-table") == 0)
 125                         table = 1;
 126                 else if (strcmp(argv[i], "-reverse") == 0)
 127                         reverse = 1;
 128                 else if (argv[i][0] == '-')
 129                         badopt = 1;
 130                 else if (!pw_source_defined)
 131                         /* non-option arguments, use as passwords */
 132                         {
 133                         pw_source_defined = 1;
 134                         passwds = &argv[i];
 135                         opt_done = 1;
 136                         }
 137                 else
 138                         badopt = 1;
 139                 }
 140
 141         if (!usecrypt && !useapr1) /* use default */
 142                 usecrypt = 1;
 143         if (usecrypt + useapr1 > 1) /* conflict */
 144                 badopt = 1;
 145
 146         /* reject unsupported algorithms */
 147 #ifdef NO_DES
 148         if (usecrypt) badopt = 1;
 149 #endif
 150 #ifdef NO_APR1
 151         if (useapr1) badopt = 1;
 152 #endif
 153
 154         if (badopt)
 155                 {
 156                 BIO_printf(bio_err, "Usage: passwd [options] [passwords]\n");
 157                 BIO_printf(bio_err, "where options are\n");
 158 #ifndef NO_DES
 159                 BIO_printf(bio_err, "-crypt             standard Unix password algorithm (default)\n");
 160 #endif
 161 #ifndef NO_APR1
 162                 BIO_printf(bio_err, "-apr1              MD5-based password algorithm\n");
 163 #endif
 164                 BIO_printf(bio_err, "-salt string       use provided salt\n");
 165                 BIO_printf(bio_err, "-in file           read passwords from file\n");
 166                 BIO_printf(bio_err, "-stdin             read passwords from stdin\n");
 167                 BIO_printf(bio_err, "-quiet             no warnings\n");
 168                 BIO_printf(bio_err, "-table             format output as table\n");
 169                 BIO_printf(bio_err, "-reverse           switch table columns\n");
 170
 171                 goto err;
 172                 }
 173
 174         if ((infile != NULL) || in_stdin)
 175                 {
 176                 in = BIO_new(BIO_s_file());
 177                 if (in == NULL)
 178                         goto err;
 179                 if (infile != NULL)
 180                         {
 181                         assert(in_stdin == 0);
 182                         if (BIO_read_filename(in, infile) <= 0)
 183                                 goto err;
 184                         }
 185                 else
 186                         {
 187                         assert(in_stdin);
 188                         BIO_set_fp(in, stdin, BIO_NOCLOSE);
 189                         }
 190                 }
 191
 192         if (usecrypt)
 193                 pw_maxlen = 8;
 194         else if (useapr1)
 195                 pw_maxlen = 256; /* arbitrary limit, should be enough for most passwords */
 196
 197         if (passwds == NULL)
 198                 {
 199                 /* no passwords on the command line */
 200
 201                 passwd_malloc_size = pw_maxlen + 2;
 202                 /* longer than necessary so that we can warn about truncation */
 203                 passwd = passwd_malloc = OPENSSL_malloc(passwd_malloc_size);
 204                 if (passwd_malloc == NULL)
 205                         goto err;
 206                 }
 207
 208         if ((in == NULL) && (passwds == NULL))
 209                 {
 210                 /* build a null-terminated list */
 211                 static char *passwds_static[2] = {NULL, NULL};
 212
 213                 passwds = passwds_static;
 214                 if (in == NULL)
 215                         if (EVP_read_pw_string(passwd_malloc, passwd_malloc_size, "Password: ", 0) != 0)
 216                                 goto err;
 217                 passwds[0] = passwd_malloc;
 218                 }
 219
 220         if (in == NULL)
 221                 {
 222                 assert(passwds != NULL);
 223                 assert(*passwds != NULL);
 224
 225                 do /* loop over list of passwords */
 226                         {
 227                         passwd = *passwds++;
 228                         if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
 229                                 quiet, table, reverse, pw_maxlen, usecrypt, useapr1))
 230                                 goto err;
 231                         }
 232                 while (*passwds != NULL);
 233                 }
 234         else
 235                 /* in != NULL */
 236                 {
 237                 int done;
 238
 239                 assert (passwd != NULL);
 240                 do
 241                         {
 242                         int r = BIO_gets(in, passwd, pw_maxlen + 1);
 243                         if (r > 0)
 244                                 {
 245                                 char *c = (strchr(passwd, '\n')) ;
 246                                 if (c != NULL)
 247                                         *c = 0; /* truncate at newline */
 248                                 else
 249                                         {
 250                                         /* ignore rest of line */
 251                                         char trash[BUFSIZ];
 252                                         do
 253                                                 r = BIO_gets(in, trash, sizeof trash);
 254                                         while ((r > 0) && (!strchr(trash, '\n')));
 255                                         }
 256
 257                                 if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
 258                                         quiet, table, reverse, pw_maxlen, usecrypt, useapr1))
 259                                         goto err;
 260                                 }
 261                         done = (r <= 0);
 262                         }
 263                 while (!done);
 264                 }
 265
 266 err:
 267         ERR_print_errors(bio_err);
 268         if (salt_malloc)
 269                 OPENSSL_free(salt_malloc);
 270         if (passwd_malloc)
 271                 OPENSSL_free(passwd_malloc);
 272         if (in)
 273                 BIO_free(in);
 274         if (out)
 275                 BIO_free(out);
 276         EXIT(ret);
 277         }
 278
 279
 280 #ifndef NO_APR1
 281 /* MD5-based password algorithm compatible to the one found in Apache
 282  * (should probably be available as a library function;
 283  * then the static buffer would not be acceptable) */
 284 static char *apr1_crypt(const char *passwd, const char *salt)
 285         {
 286         static char out_buf[6 + 9 + 24 + 2]; /* "$apr1$..salt..$.......md5hash..........\0" */
 287         unsigned char buf[MD5_DIGEST_LENGTH];
 288         char *salt_out;
 289         int n, i;
 290         MD5_CTX md;
 291         size_t passwd_len, salt_len;
 292
 293         passwd_len = strlen(passwd);
 294         strcpy(out_buf, "$apr1$");
 295         strncat(out_buf, salt, 8);
 296         assert(strlen(out_buf) <= 6 + 8); /* "$apr1$..salt.." */
 297         salt_out = out_buf + 6;
 298         salt_len = strlen(salt_out);
 299         assert(salt_len <= 8);
 300
 301         MD5_Init(&md);
 302         MD5_Update(&md, passwd, passwd_len);
 303         MD5_Update(&md, "$apr1$", 6);
 304         MD5_Update(&md, salt_out, salt_len);
 305
 306          {
 307                 MD5_CTX md2;
 308
 309                 MD5_Init(&md2);
 310                 MD5_Update(&md2, passwd, passwd_len);
 311                 MD5_Update(&md2, salt_out, salt_len);
 312                 MD5_Update(&md2, passwd, passwd_len);
 313                 MD5_Final(buf, &md2);
 314          }
 315         for (i = passwd_len; i > sizeof buf; i -= sizeof buf)
 316                 MD5_Update(&md, buf, sizeof buf);
 317         MD5_Update(&md, buf, i);
 318
 319         n = passwd_len;
 320         while (n)
 321                 {
 322                 MD5_Update(&md, (n & 1) ? "\0" : passwd, 1);
 323                 n >>= 1;
 324                 }
 325         MD5_Final(buf, &md);
 326
 327         for (i = 0; i < 1000; i++)
 328                 {
 329                 MD5_CTX md2;
 330
 331                 MD5_Init(&md2);
 332                 MD5_Update(&md2, (i & 1) ? (unsigned char *) passwd : buf,
 333                                  (i & 1) ? passwd_len : sizeof buf);
 334                 if (i % 3)
 335                         MD5_Update(&md2, salt_out, salt_len);
 336                 if (i % 7)
 337                         MD5_Update(&md2, passwd, passwd_len);
 338                 MD5_Update(&md2, (i & 1) ? buf : (unsigned char *) passwd,
 339                                  (i & 1) ? sizeof buf : passwd_len);
 340                 MD5_Final(buf, &md2);
 341                 }
 342
 343          {
 344                 /* transform buf into output string */
 345
 346                 unsigned char buf_perm[sizeof buf];
 347                 int dest, source;
 348                 char *output;
 349
 350                 /* silly output permutation */
 351                 for (dest = 0, source = 0; dest < 14; dest++, source = (source + 6) % 17)
 352                         buf_perm[dest] = buf[source];
 353                 buf_perm[14] = buf[5];
 354                 buf_perm[15] = buf[11];
 355 #ifndef PEDANTIC /* Unfortunately, this generates a "no effect" warning */
 356                 assert(16 == sizeof buf_perm);
 357 #endif
 358
 359                 output = salt_out + salt_len;
 360                 assert(output == out_buf + strlen(out_buf));
 361
 362                 *output++ = '$';
 363
 364                 for (i = 0; i < 15; i += 3)
 365                         {
 366                         *output++ = cov_2char[buf_perm[i+2] & 0x3f];
 367                         *output++ = cov_2char[((buf_perm[i+1] & 0xf) << 2) |
 368                                                   (buf_perm[i+2] >> 6)];
 369                         *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
 370                                                   (buf_perm[i+1] >> 4)];
 371                         *output++ = cov_2char[buf_perm[i] >> 2];
 372                         }
 373                 assert(i == 15);
 374                 *output++ = cov_2char[buf_perm[i] & 0x3f];
 375                 *output++ = cov_2char[buf_perm[i] >> 6];
 376                 *output = 0;
 377                 assert(strlen(out_buf) < sizeof(out_buf));
 378          }
 379
 380         return out_buf;
 381         }
 382 #endif
 383
 384
 385 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
 386         char *passwd, BIO *out, int quiet, int table, int reverse,
 387         size_t pw_maxlen, int usecrypt, int useapr1)
 388         {
 389         char *hash = NULL;
 390
 391         assert(salt_p != NULL);
 392         assert(salt_malloc_p != NULL);
 393
 394         /* first make sure we have a salt */
 395         if (!passed_salt)
 396                 {
 397 #ifndef NO_DES
 398                 if (usecrypt)
 399                         {
 400                         if (*salt_malloc_p == NULL)
 401                                 {
 402                                 *salt_p = *salt_malloc_p = OPENSSL_malloc(3);
 403                                 if (*salt_malloc_p == NULL)
 404                                         goto err;
 405                                 }
 406                         if (RAND_pseudo_bytes((unsigned char *)*salt_p, 2) < 0)
 407                                 goto err;
 408                         (*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
 409                         (*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
 410                         (*salt_p)[2] = 0;
 411 #ifdef CHARSET_EBCDIC
 412                         ascii2ebcdic(*salt_p, *salt_p, 2); /* des_crypt will convert
 413                                                             * back to ASCII */
 414 #endif
 415                         }
 416 #endif /* !NO_DES */
 417
 418 #ifndef NO_APR1
 419                 if (useapr1)
 420                         {
 421                         int i;
 422
 423                         if (*salt_malloc_p == NULL)
 424                                 {
 425                                 *salt_p = *salt_malloc_p = OPENSSL_malloc(9);
 426                                 if (*salt_malloc_p == NULL)
 427                                         goto err;
 428                                 }
 429                         if (RAND_pseudo_bytes((unsigned char *)*salt_p, 8) < 0)
 430                                 goto err;
 431
 432                         for (i = 0; i < 8; i++)
 433                                 (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 434                         (*salt_p)[8] = 0;
 435                         }
 436 #endif /* !NO_APR1 */
 437                 }
 438
 439         assert(*salt_p != NULL);
 440
 441         /* truncate password if necessary */
 442         if ((strlen(passwd) > pw_maxlen))
 443                 {
 444                 if (!quiet)
 445                         BIO_printf(bio_err, "Warning: truncating password to %u characters\n", pw_maxlen);
 446                 passwd[pw_maxlen] = 0;
 447                 }
 448         assert(strlen(passwd) <= pw_maxlen);
 449
 450         /* now compute password hash */
 451 #ifndef NO_DES
 452         if (usecrypt)
 453                 hash = des_crypt(passwd, *salt_p);
 454 #endif
 455 #ifndef NO_APR1
 456         if (useapr1)
 457                 hash = apr1_crypt(passwd, *salt_p);
 458 #endif
 459         assert(hash != NULL);
 460
 461         if (table && !reverse)
 462                 BIO_printf(out, "%s\t%s\n", passwd, hash);
 463         else if (table && reverse)
 464                 BIO_printf(out, "%s\t%s\n", hash, passwd);
 465         else
 466                 BIO_printf(out, "%s\n", hash);
 467         return 1;
 468
 469 err:
 470         return 0;
 471         }
 472 #else
 473
 474 int MAIN(int argc, char **argv)
 475         {
 476         fputs("Program not available.\n", stderr)
 477         EXIT(1);
 478         }
 479 #endif