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