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)
  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 #ifdef VMS
  85         {
  86         BIO *tmpbio = BIO_new(BIO_f_linebuffer());
  87         out = BIO_push(tmpbio, out);
  88         }
  89 #endif
  90
  91         badopt = 0, opt_done = 0;
  92         i = 0;
  93         while (!badopt && !opt_done && argv[++i] != NULL)
  94                 {
  95                 if (strcmp(argv[i], "-crypt") == 0)
  96                         usecrypt = 1;
  97                 else if (strcmp(argv[i], "-1") == 0)
  98                         use1 = 1;
  99                 else if (strcmp(argv[i], "-apr1") == 0)
 100                         useapr1 = 1;
 101                 else if (strcmp(argv[i], "-salt") == 0)
 102                         {
 103                         if ((argv[i+1] != NULL) && (salt == NULL))
 104                                 {
 105                                 passed_salt = 1;
 106                                 salt = argv[++i];
 107                                 }
 108                         else
 109                                 badopt = 1;
 110                         }
 111                 else if (strcmp(argv[i], "-in") == 0)
 112                         {
 113                         if ((argv[i+1] != NULL) && !pw_source_defined)
 114                                 {
 115                                 pw_source_defined = 1;
 116                                 infile = argv[++i];
 117                                 }
 118                         else
 119                                 badopt = 1;
 120                         }
 121                 else if (strcmp(argv[i], "-stdin") == 0)
 122                         {
 123                         if (!pw_source_defined)
 124                                 {
 125                                 pw_source_defined = 1;
 126                                 in_stdin = 1;
 127                                 }
 128                         else
 129                                 badopt = 1;
 130                         }
 131                 else if (strcmp(argv[i], "-quiet") == 0)
 132                         quiet = 1;
 133                 else if (strcmp(argv[i], "-table") == 0)
 134                         table = 1;
 135                 else if (strcmp(argv[i], "-reverse") == 0)
 136                         reverse = 1;
 137                 else if (argv[i][0] == '-')
 138                         badopt = 1;
 139                 else if (!pw_source_defined)
 140                         /* non-option arguments, use as passwords */
 141                         {
 142                         pw_source_defined = 1;
 143                         passwds = &argv[i];
 144                         opt_done = 1;
 145                         }
 146                 else
 147                         badopt = 1;
 148                 }
 149
 150         if (!usecrypt && !use1 && !useapr1) /* use default */
 151                 usecrypt = 1;
 152         if (usecrypt + use1 + useapr1 > 1) /* conflict */
 153                 badopt = 1;
 154
 155         /* reject unsupported algorithms */
 156 #ifdef NO_DES
 157         if (usecrypt) badopt = 1;
 158 #endif
 159 #ifdef NO_MD5CRYPT_1
 160         if (use1 || useapr1) badopt = 1;
 161 #endif
 162
 163         if (badopt)
 164                 {
 165                 BIO_printf(bio_err, "Usage: passwd [options] [passwords]\n");
 166                 BIO_printf(bio_err, "where options are\n");
 167 #ifndef NO_DES
 168                 BIO_printf(bio_err, "-crypt             standard Unix password algorithm (default)\n");
 169 #endif
 170 #ifndef NO_MD5CRYPT_1
 171                 BIO_printf(bio_err, "-1                 MD5-based password algorithm\n");
 172                 BIO_printf(bio_err, "-apr1              MD5-based password algorithm, Apache variant\n");
 173 #endif
 174                 BIO_printf(bio_err, "-salt string       use provided salt\n");
 175                 BIO_printf(bio_err, "-in file           read passwords from file\n");
 176                 BIO_printf(bio_err, "-stdin             read passwords from stdin\n");
 177                 BIO_printf(bio_err, "-quiet             no warnings\n");
 178                 BIO_printf(bio_err, "-table             format output as table\n");
 179                 BIO_printf(bio_err, "-reverse           switch table columns\n");
 180
 181                 goto err;
 182                 }
 183
 184         if ((infile != NULL) || in_stdin)
 185                 {
 186                 in = BIO_new(BIO_s_file());
 187                 if (in == NULL)
 188                         goto err;
 189                 if (infile != NULL)
 190                         {
 191                         assert(in_stdin == 0);
 192                         if (BIO_read_filename(in, infile) <= 0)
 193                                 goto err;
 194                         }
 195                 else
 196                         {
 197                         assert(in_stdin);
 198                         BIO_set_fp(in, stdin, BIO_NOCLOSE);
 199                         }
 200                 }
 201
 202         if (usecrypt)
 203                 pw_maxlen = 8;
 204         else if (use1 || useapr1)
 205                 pw_maxlen = 256; /* arbitrary limit, should be enough for most passwords */
 206
 207         if (passwds == NULL)
 208                 {
 209                 /* no passwords on the command line */
 210
 211                 passwd_malloc_size = pw_maxlen + 2;
 212                 /* longer than necessary so that we can warn about truncation */
 213                 passwd = passwd_malloc = OPENSSL_malloc(passwd_malloc_size);
 214                 if (passwd_malloc == NULL)
 215                         goto err;
 216                 }
 217
 218         if ((in == NULL) && (passwds == NULL))
 219                 {
 220                 /* build a null-terminated list */
 221                 static char *passwds_static[2] = {NULL, NULL};
 222
 223                 passwds = passwds_static;
 224                 if (in == NULL)
 225                         if (EVP_read_pw_string(passwd_malloc, passwd_malloc_size, "Password: ", 0) != 0)
 226                                 goto err;
 227                 passwds[0] = passwd_malloc;
 228                 }
 229
 230         if (in == NULL)
 231                 {
 232                 assert(passwds != NULL);
 233                 assert(*passwds != NULL);
 234
 235                 do /* loop over list of passwords */
 236                         {
 237                         passwd = *passwds++;
 238                         if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
 239                                 quiet, table, reverse, pw_maxlen, usecrypt, use1, useapr1))
 240                                 goto err;
 241                         }
 242                 while (*passwds != NULL);
 243                 }
 244         else
 245                 /* in != NULL */
 246                 {
 247                 int done;
 248
 249                 assert (passwd != NULL);
 250                 do
 251                         {
 252                         int r = BIO_gets(in, passwd, pw_maxlen + 1);
 253                         if (r > 0)
 254                                 {
 255                                 char *c = (strchr(passwd, '\n')) ;
 256                                 if (c != NULL)
 257                                         *c = 0; /* truncate at newline */
 258                                 else
 259                                         {
 260                                         /* ignore rest of line */
 261                                         char trash[BUFSIZ];
 262                                         do
 263                                                 r = BIO_gets(in, trash, sizeof trash);
 264                                         while ((r > 0) && (!strchr(trash, '\n')));
 265                                         }
 266
 267                                 if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
 268                                         quiet, table, reverse, pw_maxlen, usecrypt, use1, useapr1))
 269                                         goto err;
 270                                 }
 271                         done = (r <= 0);
 272                         }
 273                 while (!done);
 274                 }
 275
 276 err:
 277         ERR_print_errors(bio_err);
 278         if (salt_malloc)
 279                 OPENSSL_free(salt_malloc);
 280         if (passwd_malloc)
 281                 OPENSSL_free(passwd_malloc);
 282         if (in)
 283                 BIO_free(in);
 284         if (out)
 285                 BIO_free_all(out);
 286         EXIT(ret);
 287         }
 288
 289
 290 #ifndef NO_MD5CRYPT_1
 291 /* MD5-based password algorithm (should probably be available as a library
 292  * function; then the static buffer would not be acceptable).
 293  * For magic string "1", this should be compatible to the MD5-based BSD
 294  * password algorithm.
 295  * For 'magic' string "apr1", this is compatible to the MD5-based Apache
 296  * password algorithm.
 297  * (Apparently, the Apache password algorithm is identical except that the
 298  * 'magic' string was changed -- the laziest application of the NIH principle
 299  * I've ever encountered.)
 300  */
 301 static char *md5crypt(const char *passwd, const char *magic, const char *salt)
 302         {
 303         static char out_buf[6 + 9 + 24 + 2]; /* "$apr1$..salt..$.......md5hash..........\0" */
 304         unsigned char buf[MD5_DIGEST_LENGTH];
 305         char *salt_out;
 306         int n, i;
 307         MD5_CTX md;
 308         size_t passwd_len, salt_len;
 309
 310         passwd_len = strlen(passwd);
 311         out_buf[0] = '$';
 312         out_buf[1] = 0;
 313         assert(strlen(magic) <= 4); /* "1" or "apr1" */
 314         strncat(out_buf, magic, 4);
 315         strncat(out_buf, "$", 1);
 316         strncat(out_buf, salt, 8);
 317         assert(strlen(out_buf) <= 6 + 8); /* "$apr1$..salt.." */
 318         salt_out = out_buf + 6;
 319         salt_len = strlen(salt_out);
 320         assert(salt_len <= 8);
 321
 322         MD5_Init(&md);
 323         MD5_Update(&md, passwd, passwd_len);
 324         MD5_Update(&md, "$", 1);
 325         MD5_Update(&md, magic, strlen(magic));
 326         MD5_Update(&md, "$", 1);
 327         MD5_Update(&md, salt_out, salt_len);
 328
 329          {
 330                 MD5_CTX md2;
 331
 332                 MD5_Init(&md2);
 333                 MD5_Update(&md2, passwd, passwd_len);
 334                 MD5_Update(&md2, salt_out, salt_len);
 335                 MD5_Update(&md2, passwd, passwd_len);
 336                 MD5_Final(buf, &md2);
 337          }
 338         for (i = passwd_len; i > sizeof buf; i -= sizeof buf)
 339                 MD5_Update(&md, buf, sizeof buf);
 340         MD5_Update(&md, buf, i);
 341
 342         n = passwd_len;
 343         while (n)
 344                 {
 345                 MD5_Update(&md, (n & 1) ? "\0" : passwd, 1);
 346                 n >>= 1;
 347                 }
 348         MD5_Final(buf, &md);
 349
 350         for (i = 0; i < 1000; i++)
 351                 {
 352                 MD5_CTX md2;
 353
 354                 MD5_Init(&md2);
 355                 MD5_Update(&md2, (i & 1) ? (unsigned char *) passwd : buf,
 356                                  (i & 1) ? passwd_len : sizeof buf);
 357                 if (i % 3)
 358                         MD5_Update(&md2, salt_out, salt_len);
 359                 if (i % 7)
 360                         MD5_Update(&md2, passwd, passwd_len);
 361                 MD5_Update(&md2, (i & 1) ? buf : (unsigned char *) passwd,
 362                                  (i & 1) ? sizeof buf : passwd_len);
 363                 MD5_Final(buf, &md2);
 364                 }
 365
 366          {
 367                 /* transform buf into output string */
 368
 369                 unsigned char buf_perm[sizeof buf];
 370                 int dest, source;
 371                 char *output;
 372
 373                 /* silly output permutation */
 374                 for (dest = 0, source = 0; dest < 14; dest++, source = (source + 6) % 17)
 375                         buf_perm[dest] = buf[source];
 376                 buf_perm[14] = buf[5];
 377                 buf_perm[15] = buf[11];
 378 #ifndef PEDANTIC /* Unfortunately, this generates a "no effect" warning */
 379                 assert(16 == sizeof buf_perm);
 380 #endif
 381
 382                 output = salt_out + salt_len;
 383                 assert(output == out_buf + strlen(out_buf));
 384
 385                 *output++ = '$';
 386
 387                 for (i = 0; i < 15; i += 3)
 388                         {
 389                         *output++ = cov_2char[buf_perm[i+2] & 0x3f];
 390                         *output++ = cov_2char[((buf_perm[i+1] & 0xf) << 2) |
 391                                                   (buf_perm[i+2] >> 6)];
 392                         *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
 393                                                   (buf_perm[i+1] >> 4)];
 394                         *output++ = cov_2char[buf_perm[i] >> 2];
 395                         }
 396                 assert(i == 15);
 397                 *output++ = cov_2char[buf_perm[i] & 0x3f];
 398                 *output++ = cov_2char[buf_perm[i] >> 6];
 399                 *output = 0;
 400                 assert(strlen(out_buf) < sizeof(out_buf));
 401          }
 402
 403         return out_buf;
 404         }
 405 #endif
 406
 407
 408 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
 409         char *passwd, BIO *out, int quiet, int table, int reverse,
 410         size_t pw_maxlen, int usecrypt, int use1, int useapr1)
 411         {
 412         char *hash = NULL;
 413
 414         assert(salt_p != NULL);
 415         assert(salt_malloc_p != NULL);
 416
 417         /* first make sure we have a salt */
 418         if (!passed_salt)
 419                 {
 420 #ifndef NO_DES
 421                 if (usecrypt)
 422                         {
 423                         if (*salt_malloc_p == NULL)
 424                                 {
 425                                 *salt_p = *salt_malloc_p = OPENSSL_malloc(3);
 426                                 if (*salt_malloc_p == NULL)
 427                                         goto err;
 428                                 }
 429                         if (RAND_pseudo_bytes((unsigned char *)*salt_p, 2) < 0)
 430                                 goto err;
 431                         (*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
 432                         (*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
 433                         (*salt_p)[2] = 0;
 434 #ifdef CHARSET_EBCDIC
 435                         ascii2ebcdic(*salt_p, *salt_p, 2); /* des_crypt will convert
 436                                                             * back to ASCII */
 437 #endif
 438                         }
 439 #endif /* !NO_DES */
 440
 441 #ifndef NO_MD5CRYPT_1
 442                 if (use1 || useapr1)
 443                         {
 444                         int i;
 445
 446                         if (*salt_malloc_p == NULL)
 447                                 {
 448                                 *salt_p = *salt_malloc_p = OPENSSL_malloc(9);
 449                                 if (*salt_malloc_p == NULL)
 450                                         goto err;
 451                                 }
 452                         if (RAND_pseudo_bytes((unsigned char *)*salt_p, 8) < 0)
 453                                 goto err;
 454
 455                         for (i = 0; i < 8; i++)
 456                                 (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
 457                         (*salt_p)[8] = 0;
 458                         }
 459 #endif /* !NO_MD5CRYPT_1 */
 460                 }
 461
 462         assert(*salt_p != NULL);
 463
 464         /* truncate password if necessary */
 465         if ((strlen(passwd) > pw_maxlen))
 466                 {
 467                 if (!quiet)
 468                         BIO_printf(bio_err, "Warning: truncating password to %u characters\n", pw_maxlen);
 469                 passwd[pw_maxlen] = 0;
 470                 }
 471         assert(strlen(passwd) <= pw_maxlen);
 472
 473         /* now compute password hash */
 474 #ifndef NO_DES
 475         if (usecrypt)
 476                 hash = des_crypt(passwd, *salt_p);
 477 #endif
 478 #ifndef NO_MD5CRYPT_1
 479         if (use1 || useapr1)
 480                 hash = md5crypt(passwd, (use1 ? "1" : "apr1"), *salt_p);
 481 #endif
 482         assert(hash != NULL);
 483
 484         if (table && !reverse)
 485                 BIO_printf(out, "%s\t%s\n", passwd, hash);
 486         else if (table && reverse)
 487                 BIO_printf(out, "%s\t%s\n", hash, passwd);
 488         else
 489                 BIO_printf(out, "%s\n", hash);
 490         return 1;
 491
 492 err:
 493         return 0;
 494         }
 495 #else
 496
 497 int MAIN(int argc, char **argv)
 498         {
 499         fputs("Program not available.\n", stderr)
 500         EXIT(1);
 501         }
 502 #endif