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passwd.c
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1 /* apps/passwd.c */
2 
3 #if defined OPENSSL_NO_MD5 || defined CHARSET_EBCDIC
4 # define NO_MD5CRYPT_1
5 #endif
6 
7 #if !defined(OPENSSL_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 #ifndef OPENSSL_NO_DES
19 # include <openssl/des.h>
20 #endif
21 #ifndef NO_MD5CRYPT_1
22 # include <openssl/md5.h>
23 #endif
24 
25 
26 #undef PROG
27 #define PROG passwd_main
28 
29 
30 static unsigned const char cov_2char[64]={
31  /* from crypto/des/fcrypt.c */
32  0x2E,0x2F,0x30,0x31,0x32,0x33,0x34,0x35,
33  0x36,0x37,0x38,0x39,0x41,0x42,0x43,0x44,
34  0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,
35  0x4D,0x4E,0x4F,0x50,0x51,0x52,0x53,0x54,
36  0x55,0x56,0x57,0x58,0x59,0x5A,0x61,0x62,
37  0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,
38  0x6B,0x6C,0x6D,0x6E,0x6F,0x70,0x71,0x72,
39  0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A
40 };
41 
42 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
43  char *passwd, BIO *out, int quiet, int table, int reverse,
44  size_t pw_maxlen, int usecrypt, int use1, int useapr1);
45 
46 /* -crypt - standard Unix password algorithm (default)
47  * -1 - MD5-based password algorithm
48  * -apr1 - MD5-based password algorithm, Apache variant
49  * -salt string - salt
50  * -in file - read passwords from file
51  * -stdin - read passwords from stdin
52  * -noverify - never verify when reading password from terminal
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  int in_noverify = 0;
66  char *salt = NULL, *passwd = NULL, **passwds = NULL;
67  char *salt_malloc = NULL, *passwd_malloc = NULL;
68  size_t passwd_malloc_size = 0;
69  int pw_source_defined = 0;
70  BIO *in = NULL, *out = NULL;
71  int i, badopt, opt_done;
72  int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
73  int usecrypt = 0, use1 = 0, useapr1 = 0;
74  size_t pw_maxlen = 0;
75 
76  apps_startup();
77 
78  if (bio_err == NULL)
79  if ((bio_err=BIO_new(BIO_s_file())) != NULL)
80  BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
81 
82  if (!load_config(bio_err, NULL))
83  goto err;
84  out = BIO_new(BIO_s_file());
85  if (out == NULL)
86  goto err;
87  BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
88 #ifdef OPENSSL_SYS_VMS
89  {
90  BIO *tmpbio = BIO_new(BIO_f_linebuffer());
91  out = BIO_push(tmpbio, out);
92  }
93 #endif
94 
95  badopt = 0, opt_done = 0;
96  i = 0;
97  while (!badopt && !opt_done && argv[++i] != NULL)
98  {
99  if (strcmp(argv[i], "-crypt") == 0)
100  usecrypt = 1;
101  else if (strcmp(argv[i], "-1") == 0)
102  use1 = 1;
103  else if (strcmp(argv[i], "-apr1") == 0)
104  useapr1 = 1;
105  else if (strcmp(argv[i], "-salt") == 0)
106  {
107  if ((argv[i+1] != NULL) && (salt == NULL))
108  {
109  passed_salt = 1;
110  salt = argv[++i];
111  }
112  else
113  badopt = 1;
114  }
115  else if (strcmp(argv[i], "-in") == 0)
116  {
117  if ((argv[i+1] != NULL) && !pw_source_defined)
118  {
119  pw_source_defined = 1;
120  infile = argv[++i];
121  }
122  else
123  badopt = 1;
124  }
125  else if (strcmp(argv[i], "-stdin") == 0)
126  {
127  if (!pw_source_defined)
128  {
129  pw_source_defined = 1;
130  in_stdin = 1;
131  }
132  else
133  badopt = 1;
134  }
135  else if (strcmp(argv[i], "-noverify") == 0)
136  in_noverify = 1;
137  else if (strcmp(argv[i], "-quiet") == 0)
138  quiet = 1;
139  else if (strcmp(argv[i], "-table") == 0)
140  table = 1;
141  else if (strcmp(argv[i], "-reverse") == 0)
142  reverse = 1;
143  else if (argv[i][0] == '-')
144  badopt = 1;
145  else if (!pw_source_defined)
146  /* non-option arguments, use as passwords */
147  {
148  pw_source_defined = 1;
149  passwds = &argv[i];
150  opt_done = 1;
151  }
152  else
153  badopt = 1;
154  }
155 
156  if (!usecrypt && !use1 && !useapr1) /* use default */
157  usecrypt = 1;
158  if (usecrypt + use1 + useapr1 > 1) /* conflict */
159  badopt = 1;
160 
161  /* reject unsupported algorithms */
162 #ifdef OPENSSL_NO_DES
163  if (usecrypt) badopt = 1;
164 #endif
165 #ifdef NO_MD5CRYPT_1
166  if (use1 || useapr1) badopt = 1;
167 #endif
168 
169  if (badopt)
170  {
171  BIO_printf(bio_err, "Usage: passwd [options] [passwords]\n");
172  BIO_printf(bio_err, "where options are\n");
173 #ifndef OPENSSL_NO_DES
174  BIO_printf(bio_err, "-crypt standard Unix password algorithm (default)\n");
175 #endif
176 #ifndef NO_MD5CRYPT_1
177  BIO_printf(bio_err, "-1 MD5-based password algorithm\n");
178  BIO_printf(bio_err, "-apr1 MD5-based password algorithm, Apache variant\n");
179 #endif
180  BIO_printf(bio_err, "-salt string use provided salt\n");
181  BIO_printf(bio_err, "-in file read passwords from file\n");
182  BIO_printf(bio_err, "-stdin read passwords from stdin\n");
183  BIO_printf(bio_err, "-noverify never verify when reading password from terminal\n");
184  BIO_printf(bio_err, "-quiet no warnings\n");
185  BIO_printf(bio_err, "-table format output as table\n");
186  BIO_printf(bio_err, "-reverse switch table columns\n");
187 
188  goto err;
189  }
190 
191  if ((infile != NULL) || in_stdin)
192  {
193  in = BIO_new(BIO_s_file());
194  if (in == NULL)
195  goto err;
196  if (infile != NULL)
197  {
198  assert(in_stdin == 0);
199  if (BIO_read_filename(in, infile) <= 0)
200  goto err;
201  }
202  else
203  {
204  assert(in_stdin);
205  BIO_set_fp(in, stdin, BIO_NOCLOSE);
206  }
207  }
208 
209  if (usecrypt)
210  pw_maxlen = 8;
211  else if (use1 || useapr1)
212  pw_maxlen = 256; /* arbitrary limit, should be enough for most passwords */
213 
214  if (passwds == NULL)
215  {
216  /* no passwords on the command line */
217 
218  passwd_malloc_size = pw_maxlen + 2;
219  /* longer than necessary so that we can warn about truncation */
220  passwd = passwd_malloc = OPENSSL_malloc(passwd_malloc_size);
221  if (passwd_malloc == NULL)
222  goto err;
223  }
224 
225  if ((in == NULL) && (passwds == NULL))
226  {
227  /* build a null-terminated list */
228  static char *passwds_static[2] = {NULL, NULL};
229 
230  passwds = passwds_static;
231  if (in == NULL)
232  if (EVP_read_pw_string(passwd_malloc, passwd_malloc_size, "Password: ", !(passed_salt || in_noverify)) != 0)
233  goto err;
234  passwds[0] = passwd_malloc;
235  }
236 
237  if (in == NULL)
238  {
239  assert(passwds != NULL);
240  assert(*passwds != NULL);
241 
242  do /* loop over list of passwords */
243  {
244  passwd = *passwds++;
245  if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
246  quiet, table, reverse, pw_maxlen, usecrypt, use1, useapr1))
247  goto err;
248  }
249  while (*passwds != NULL);
250  }
251  else
252  /* in != NULL */
253  {
254  int done;
255 
256  assert (passwd != NULL);
257  do
258  {
259  int r = BIO_gets(in, passwd, pw_maxlen + 1);
260  if (r > 0)
261  {
262  char *c = (strchr(passwd, '\n')) ;
263  if (c != NULL)
264  *c = 0; /* truncate at newline */
265  else
266  {
267  /* ignore rest of line */
268  char trash[BUFSIZ];
269  do
270  r = BIO_gets(in, trash, sizeof trash);
271  while ((r > 0) && (!strchr(trash, '\n')));
272  }
273 
274  if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
275  quiet, table, reverse, pw_maxlen, usecrypt, use1, useapr1))
276  goto err;
277  }
278  done = (r <= 0);
279  }
280  while (!done);
281  }
282  ret = 0;
283 
284 err:
285  ERR_print_errors(bio_err);
286  if (salt_malloc)
287  OPENSSL_free(salt_malloc);
288  if (passwd_malloc)
289  OPENSSL_free(passwd_malloc);
290  if (in)
291  BIO_free(in);
292  if (out)
293  BIO_free_all(out);
294  apps_shutdown();
295  OPENSSL_EXIT(ret);
296  }
297 
298 
299 #ifndef NO_MD5CRYPT_1
300 /* MD5-based password algorithm (should probably be available as a library
301  * function; then the static buffer would not be acceptable).
302  * For magic string "1", this should be compatible to the MD5-based BSD
303  * password algorithm.
304  * For 'magic' string "apr1", this is compatible to the MD5-based Apache
305  * password algorithm.
306  * (Apparently, the Apache password algorithm is identical except that the
307  * 'magic' string was changed -- the laziest application of the NIH principle
308  * I've ever encountered.)
309  */
310 static char *md5crypt(const char *passwd, const char *magic, const char *salt)
311  {
312  static char out_buf[6 + 9 + 24 + 2]; /* "$apr1$..salt..$.......md5hash..........\0" */
313  unsigned char buf[MD5_DIGEST_LENGTH];
314  char *salt_out;
315  int n;
316  unsigned int i;
317  EVP_MD_CTX md,md2;
318  size_t passwd_len, salt_len;
319 
320  passwd_len = strlen(passwd);
321  out_buf[0] = '$';
322  out_buf[1] = 0;
323  assert(strlen(magic) <= 4); /* "1" or "apr1" */
324  strncat(out_buf, magic, 4);
325  strncat(out_buf, "$", 1);
326  strncat(out_buf, salt, 8);
327  assert(strlen(out_buf) <= 6 + 8); /* "$apr1$..salt.." */
328  salt_out = out_buf + 2 + strlen(magic);
329  salt_len = strlen(salt_out);
330  assert(salt_len <= 8);
331 
332  EVP_MD_CTX_init(&md);
333  EVP_DigestInit_ex(&md,EVP_md5(), NULL);
334  EVP_DigestUpdate(&md, passwd, passwd_len);
335  EVP_DigestUpdate(&md, "$", 1);
336  EVP_DigestUpdate(&md, magic, strlen(magic));
337  EVP_DigestUpdate(&md, "$", 1);
338  EVP_DigestUpdate(&md, salt_out, salt_len);
339 
340  EVP_MD_CTX_init(&md2);
341  EVP_DigestInit_ex(&md2,EVP_md5(), NULL);
342  EVP_DigestUpdate(&md2, passwd, passwd_len);
343  EVP_DigestUpdate(&md2, salt_out, salt_len);
344  EVP_DigestUpdate(&md2, passwd, passwd_len);
345  EVP_DigestFinal_ex(&md2, buf, NULL);
346 
347  for (i = passwd_len; i > sizeof buf; i -= sizeof buf)
348  EVP_DigestUpdate(&md, buf, sizeof buf);
349  EVP_DigestUpdate(&md, buf, i);
350 
351  n = passwd_len;
352  while (n)
353  {
354  EVP_DigestUpdate(&md, (n & 1) ? "\0" : passwd, 1);
355  n >>= 1;
356  }
357  EVP_DigestFinal_ex(&md, buf, NULL);
358 
359  for (i = 0; i < 1000; i++)
360  {
361  EVP_DigestInit_ex(&md2,EVP_md5(), NULL);
362  EVP_DigestUpdate(&md2, (i & 1) ? (unsigned const char *) passwd : buf,
363  (i & 1) ? passwd_len : sizeof buf);
364  if (i % 3)
365  EVP_DigestUpdate(&md2, salt_out, salt_len);
366  if (i % 7)
367  EVP_DigestUpdate(&md2, passwd, passwd_len);
368  EVP_DigestUpdate(&md2, (i & 1) ? buf : (unsigned const char *) passwd,
369  (i & 1) ? sizeof buf : passwd_len);
370  EVP_DigestFinal_ex(&md2, buf, NULL);
371  }
372  EVP_MD_CTX_cleanup(&md2);
373 
374  {
375  /* transform buf into output string */
376 
377  unsigned char buf_perm[sizeof buf];
378  int dest, source;
379  char *output;
380 
381  /* silly output permutation */
382  for (dest = 0, source = 0; dest < 14; dest++, source = (source + 6) % 17)
383  buf_perm[dest] = buf[source];
384  buf_perm[14] = buf[5];
385  buf_perm[15] = buf[11];
386 #ifndef PEDANTIC /* Unfortunately, this generates a "no effect" warning */
387  assert(16 == sizeof buf_perm);
388 #endif
389 
390  output = salt_out + salt_len;
391  assert(output == out_buf + strlen(out_buf));
392 
393  *output++ = '$';
394 
395  for (i = 0; i < 15; i += 3)
396  {
397  *output++ = cov_2char[buf_perm[i+2] & 0x3f];
398  *output++ = cov_2char[((buf_perm[i+1] & 0xf) << 2) |
399  (buf_perm[i+2] >> 6)];
400  *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
401  (buf_perm[i+1] >> 4)];
402  *output++ = cov_2char[buf_perm[i] >> 2];
403  }
404  assert(i == 15);
405  *output++ = cov_2char[buf_perm[i] & 0x3f];
406  *output++ = cov_2char[buf_perm[i] >> 6];
407  *output = 0;
408  assert(strlen(out_buf) < sizeof(out_buf));
409  }
410  EVP_MD_CTX_cleanup(&md);
411 
412  return out_buf;
413  }
414 #endif
415 
416 
417 static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
418  char *passwd, BIO *out, int quiet, int table, int reverse,
419  size_t pw_maxlen, int usecrypt, int use1, int useapr1)
420  {
421  char *hash = NULL;
422 
423  assert(salt_p != NULL);
424  assert(salt_malloc_p != NULL);
425 
426  /* first make sure we have a salt */
427  if (!passed_salt)
428  {
429 #ifndef OPENSSL_NO_DES
430  if (usecrypt)
431  {
432  if (*salt_malloc_p == NULL)
433  {
434  *salt_p = *salt_malloc_p = OPENSSL_malloc(3);
435  if (*salt_malloc_p == NULL)
436  goto err;
437  }
438  if (RAND_pseudo_bytes((unsigned char *)*salt_p, 2) < 0)
439  goto err;
440  (*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
441  (*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
442  (*salt_p)[2] = 0;
443 #ifdef CHARSET_EBCDIC
444  ascii2ebcdic(*salt_p, *salt_p, 2); /* des_crypt will convert
445  * back to ASCII */
446 #endif
447  }
448 #endif /* !OPENSSL_NO_DES */
449 
450 #ifndef NO_MD5CRYPT_1
451  if (use1 || useapr1)
452  {
453  int i;
454 
455  if (*salt_malloc_p == NULL)
456  {
457  *salt_p = *salt_malloc_p = OPENSSL_malloc(9);
458  if (*salt_malloc_p == NULL)
459  goto err;
460  }
461  if (RAND_pseudo_bytes((unsigned char *)*salt_p, 8) < 0)
462  goto err;
463 
464  for (i = 0; i < 8; i++)
465  (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
466  (*salt_p)[8] = 0;
467  }
468 #endif /* !NO_MD5CRYPT_1 */
469  }
470 
471  assert(*salt_p != NULL);
472 
473  /* truncate password if necessary */
474  if ((strlen(passwd) > pw_maxlen))
475  {
476  if (!quiet)
477  /* XXX: really we should know how to print a size_t, not cast it */
478  BIO_printf(bio_err, "Warning: truncating password to %u characters\n", (unsigned)pw_maxlen);
479  passwd[pw_maxlen] = 0;
480  }
481  assert(strlen(passwd) <= pw_maxlen);
482 
483  /* now compute password hash */
484 #ifndef OPENSSL_NO_DES
485  if (usecrypt)
486  hash = DES_crypt(passwd, *salt_p);
487 #endif
488 #ifndef NO_MD5CRYPT_1
489  if (use1 || useapr1)
490  hash = md5crypt(passwd, (use1 ? "1" : "apr1"), *salt_p);
491 #endif
492  assert(hash != NULL);
493 
494  if (table && !reverse)
495  BIO_printf(out, "%s\t%s\n", passwd, hash);
496  else if (table && reverse)
497  BIO_printf(out, "%s\t%s\n", hash, passwd);
498  else
499  BIO_printf(out, "%s\n", hash);
500  return 1;
501 
502 err:
503  return 0;
504  }
505 #else
506 
507 int MAIN(int argc, char **argv)
508  {
509  fputs("Program not available.\n", stderr)
510  OPENSSL_EXIT(1);
511  }
512 #endif
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