summaryrefslogtreecommitdiff
path: root/usr.bin/openssl/passwd.c
blob: af5360448c5220b5ebe1e07997165cdc50f4b7c7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
/* $OpenBSD: passwd.c,v 1.8 2017/01/20 08:57:12 deraadt Exp $ */

#if defined OPENSSL_NO_MD5
#define NO_MD5CRYPT_1
#endif

#if !defined(OPENSSL_NO_DES) || !defined(NO_MD5CRYPT_1)

#include <assert.h>
#include <string.h>

#include "apps.h"

#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/evp.h>

#ifndef OPENSSL_NO_DES
#include <openssl/des.h>
#endif

#ifndef NO_MD5CRYPT_1
#include <openssl/md5.h>
#endif

static unsigned const char cov_2char[64] = {
	/* from crypto/des/fcrypt.c */
	0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
	0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44,
	0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C,
	0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54,
	0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62,
	0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
	0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72,
	0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
};

static int
do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
    char *passwd, BIO * out, int quiet, int table, int reverse,
    size_t pw_maxlen, int usecrypt, int use1, int useapr1);

static struct {
	char *infile;
	int in_stdin;
	int noverify;
	int quiet;
	int reverse;
	char *salt;
	int table;
	int use1;
	int useapr1;
	int usecrypt;
} passwd_config;

static struct option passwd_options[] = {
#ifndef NO_MD5CRYPT_1
	{
		.name = "1",
		.desc = "Use MD5 based BSD password algorithm 1",
		.type = OPTION_FLAG,
		.opt.flag = &passwd_config.use1,
	},
	{
		.name = "apr1",
		.desc = "Use apr1 algorithm (Apache variant of BSD algorithm)",
		.type = OPTION_FLAG,
		.opt.flag = &passwd_config.useapr1,
	},
#endif
#ifndef OPENSSL_NO_DES
	{
		.name = "crypt",
		.desc = "Use crypt algorithm (default)",
		.type = OPTION_FLAG,
		.opt.flag = &passwd_config.usecrypt,
	},
#endif
	{
		.name = "in",
		.argname = "file",
		.desc = "Read passwords from specified file",
		.type = OPTION_ARG,
		.opt.arg = &passwd_config.infile,
	},
	{
		.name = "noverify",
		.desc = "Do not verify password",
		.type = OPTION_FLAG,
		.opt.flag = &passwd_config.noverify,
	},
	{
		.name = "quiet",
		.desc = "Do not output warnings",
		.type = OPTION_FLAG,
		.opt.flag = &passwd_config.quiet,
	},
	{
		.name = "reverse",
		.desc = "Reverse table columns (requires -table)",
		.type = OPTION_FLAG,
		.opt.flag = &passwd_config.reverse,
	},
	{
		.name = "salt",
		.argname = "string",
		.desc = "Use specified salt",
		.type = OPTION_ARG,
		.opt.arg = &passwd_config.salt,
	},
	{
		.name = "stdin",
		.desc = "Read passwords from stdin",
		.type = OPTION_FLAG,
		.opt.flag = &passwd_config.in_stdin,
	},
	{
		.name = "table",
		.desc = "Output cleartext and hashed passwords (tab separated)",
		.type = OPTION_FLAG,
		.opt.flag = &passwd_config.table,
	},
	{ NULL },
};

static void
passwd_usage(void)
{
        fprintf(stderr, "usage: passwd [-1 | -apr1 | -crypt] [-in file] "
	    "[-noverify] [-quiet]\n"
	    "    [-reverse] [-salt string] [-stdin] [-table] [password]\n\n");
        options_usage(passwd_options);
}

int
passwd_main(int argc, char **argv)
{
	char *passwd = NULL, **passwds = NULL;
	char *salt_malloc = NULL, *passwd_malloc = NULL;
	size_t passwd_malloc_size = 0;
	BIO *in = NULL, *out = NULL;
	int badopt = 0;
	int passed_salt = 0;
	size_t pw_maxlen = 0;
	int argsused;
	int ret = 1;

	if (single_execution) {
		if (pledge("stdio cpath wpath rpath tty", NULL) == -1) {
			perror("pledge");
			exit(1);
		}
	}

	memset(&passwd_config, 0, sizeof(passwd_config));

	if (options_parse(argc, argv, passwd_options, NULL, &argsused) != 0) {
		passwd_usage();
		goto err;
	}

	if (argsused < argc)
		passwds = &argv[argsused];
	if (passwd_config.salt != NULL)
		passed_salt = 1;

	if (!passwd_config.usecrypt && !passwd_config.use1 &&
	    !passwd_config.useapr1)
		passwd_config.usecrypt = 1;	/* use default */
	if (passwd_config.usecrypt + passwd_config.use1 +
	    passwd_config.useapr1 > 1)
		badopt = 1;	/* conflicting options */

	/* Reject unsupported algorithms */
#ifdef OPENSSL_NO_DES
	if (passwd_config.usecrypt)
		badopt = 1;
#endif
#ifdef NO_MD5CRYPT_1
	if (passwd_config.use1 || passwd_config.useapr1)
		badopt = 1;
#endif

	if (badopt) {
		passwd_usage();
		goto err;
	}

	if ((out = BIO_new(BIO_s_file())) == NULL)
		goto err;
	BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);

	if (passwd_config.infile != NULL || passwd_config.in_stdin) {
		if ((in = BIO_new(BIO_s_file())) == NULL)
			goto err;
		if (passwd_config.infile != NULL) {
			assert(passwd_config.in_stdin == 0);
			if (BIO_read_filename(in, passwd_config.infile) <= 0)
				goto err;
		} else {
			assert(passwd_config.in_stdin);
			BIO_set_fp(in, stdin, BIO_NOCLOSE);
		}
	}
	if (passwd_config.usecrypt)
		pw_maxlen = 8;
	else if (passwd_config.use1 || passwd_config.useapr1)
		pw_maxlen = 256;/* arbitrary limit, should be enough for most
				 * passwords */

	if (passwds == NULL) {
		/* no passwords on the command line */

		passwd_malloc_size = pw_maxlen + 2;
		/* longer than necessary so that we can warn about truncation */
		passwd = passwd_malloc = malloc(passwd_malloc_size);
		if (passwd_malloc == NULL)
			goto err;
	}
	if (in == NULL && passwds == NULL) {
		/* build a null-terminated list */
		static char *passwds_static[2] = {NULL, NULL};

		passwds = passwds_static;
		if (in == NULL)
			if (EVP_read_pw_string(passwd_malloc,
			    passwd_malloc_size, "Password: ",
			    !(passed_salt || passwd_config.noverify)) != 0)
				goto err;
		passwds[0] = passwd_malloc;
	}
	if (in == NULL) {
		assert(passwds != NULL);
		assert(*passwds != NULL);

		do {	/* loop over list of passwords */
			passwd = *passwds++;
			if (!do_passwd(passed_salt, &passwd_config.salt,
			    &salt_malloc, passwd, out, passwd_config.quiet,
			    passwd_config.table, passwd_config.reverse,
			    pw_maxlen, passwd_config.usecrypt,
			    passwd_config.use1, passwd_config.useapr1))
				goto err;
		} while (*passwds != NULL);
	} else {
		int done;

		assert(passwd != NULL);
		do {
			int r = BIO_gets(in, passwd, pw_maxlen + 1);
			if (r > 0) {
				char *c = (strchr(passwd, '\n'));
				if (c != NULL)
					*c = 0;	/* truncate at newline */
				else {
					/* ignore rest of line */
					char trash[BUFSIZ];
					do
						r = BIO_gets(in, trash, sizeof trash);
					while ((r > 0) && (!strchr(trash, '\n')));
				}

				if (!do_passwd(passed_salt, &passwd_config.salt,
				    &salt_malloc, passwd, out,
				    passwd_config.quiet, passwd_config.table,
				    passwd_config.reverse, pw_maxlen,
				    passwd_config.usecrypt, passwd_config.use1,
				    passwd_config.useapr1))
					goto err;
			}
			done = (r <= 0);
		} while (!done);
	}
	ret = 0;

err:
	ERR_print_errors(bio_err);

	free(salt_malloc);
	free(passwd_malloc);

	BIO_free(in);
	BIO_free_all(out);

	return (ret);
}


#ifndef NO_MD5CRYPT_1
/* MD5-based password algorithm (should probably be available as a library
 * function; then the static buffer would not be acceptable).
 * For magic string "1", this should be compatible to the MD5-based BSD
 * password algorithm.
 * For 'magic' string "apr1", this is compatible to the MD5-based Apache
 * password algorithm.
 * (Apparently, the Apache password algorithm is identical except that the
 * 'magic' string was changed -- the laziest application of the NIH principle
 * I've ever encountered.)
 */
static char *
md5crypt(const char *passwd, const char *magic, const char *salt)
{
	static char out_buf[6 + 9 + 24 + 2];	/* "$apr1$..salt..$.......md5h
						 * ash..........\0" */
	unsigned char buf[MD5_DIGEST_LENGTH];
	char *salt_out;
	int n;
	unsigned int i;
	EVP_MD_CTX md, md2;
	size_t passwd_len, salt_len;

	passwd_len = strlen(passwd);
	out_buf[0] = '$';
	out_buf[1] = 0;
	assert(strlen(magic) <= 4);	/* "1" or "apr1" */
	strlcat(out_buf, magic, sizeof(out_buf));
	strlcat(out_buf, "$", sizeof(out_buf));
	strlcat(out_buf, salt, sizeof(out_buf));
	assert(strlen(out_buf) <= 6 + 8);	/* "$apr1$..salt.." */
	salt_out = out_buf + 2 + strlen(magic);
	salt_len = strlen(salt_out);
	assert(salt_len <= 8);

	EVP_MD_CTX_init(&md);
	EVP_DigestInit_ex(&md, EVP_md5(), NULL);
	EVP_DigestUpdate(&md, passwd, passwd_len);
	EVP_DigestUpdate(&md, "$", 1);
	EVP_DigestUpdate(&md, magic, strlen(magic));
	EVP_DigestUpdate(&md, "$", 1);
	EVP_DigestUpdate(&md, salt_out, salt_len);

	EVP_MD_CTX_init(&md2);
	EVP_DigestInit_ex(&md2, EVP_md5(), NULL);
	EVP_DigestUpdate(&md2, passwd, passwd_len);
	EVP_DigestUpdate(&md2, salt_out, salt_len);
	EVP_DigestUpdate(&md2, passwd, passwd_len);
	EVP_DigestFinal_ex(&md2, buf, NULL);

	for (i = passwd_len; i > sizeof buf; i -= sizeof buf)
		EVP_DigestUpdate(&md, buf, sizeof buf);
	EVP_DigestUpdate(&md, buf, i);

	n = passwd_len;
	while (n) {
		EVP_DigestUpdate(&md, (n & 1) ? "\0" : passwd, 1);
		n >>= 1;
	}
	EVP_DigestFinal_ex(&md, buf, NULL);

	for (i = 0; i < 1000; i++) {
		EVP_DigestInit_ex(&md2, EVP_md5(), NULL);
		EVP_DigestUpdate(&md2, (i & 1) ? (unsigned const char *) passwd : buf,
		    (i & 1) ? passwd_len : sizeof buf);
		if (i % 3)
			EVP_DigestUpdate(&md2, salt_out, salt_len);
		if (i % 7)
			EVP_DigestUpdate(&md2, passwd, passwd_len);
		EVP_DigestUpdate(&md2, (i & 1) ? buf : (unsigned const char *) passwd,
		    (i & 1) ? sizeof buf : passwd_len);
		EVP_DigestFinal_ex(&md2, buf, NULL);
	}
	EVP_MD_CTX_cleanup(&md2);

	{
		/* transform buf into output string */

		unsigned char buf_perm[sizeof buf];
		int dest, source;
		char *output;

		/* silly output permutation */
		for (dest = 0, source = 0; dest < 14; dest++, source = (source + 6) % 17)
			buf_perm[dest] = buf[source];
		buf_perm[14] = buf[5];
		buf_perm[15] = buf[11];
		assert(16 == sizeof buf_perm);

		output = salt_out + salt_len;
		assert(output == out_buf + strlen(out_buf));

		*output++ = '$';

		for (i = 0; i < 15; i += 3) {
			*output++ = cov_2char[buf_perm[i + 2] & 0x3f];
			*output++ = cov_2char[((buf_perm[i + 1] & 0xf) << 2) |
			    (buf_perm[i + 2] >> 6)];
			*output++ = cov_2char[((buf_perm[i] & 3) << 4) |
			    (buf_perm[i + 1] >> 4)];
			*output++ = cov_2char[buf_perm[i] >> 2];
		}
		assert(i == 15);
		*output++ = cov_2char[buf_perm[i] & 0x3f];
		*output++ = cov_2char[buf_perm[i] >> 6];
		*output = 0;
		assert(strlen(out_buf) < sizeof(out_buf));
	}
	EVP_MD_CTX_cleanup(&md);

	return out_buf;
}
#endif


static int
do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
    char *passwd, BIO * out, int quiet, int table, int reverse,
    size_t pw_maxlen, int usecrypt, int use1, int useapr1)
{
	char *hash = NULL;

	assert(salt_p != NULL);
	assert(salt_malloc_p != NULL);

	/* first make sure we have a salt */
	if (!passed_salt) {
#ifndef OPENSSL_NO_DES
		if (usecrypt) {
			if (*salt_malloc_p == NULL) {
				*salt_p = *salt_malloc_p = malloc(3);
				if (*salt_malloc_p == NULL)
					goto err;
			}
			arc4random_buf(*salt_p, 2);
			(*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f];	/* 6 bits */
			(*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f];	/* 6 bits */
			(*salt_p)[2] = 0;
		}
#endif				/* !OPENSSL_NO_DES */

#ifndef NO_MD5CRYPT_1
		if (use1 || useapr1) {
			int i;

			if (*salt_malloc_p == NULL) {
				*salt_p = *salt_malloc_p = malloc(9);
				if (*salt_malloc_p == NULL)
					goto err;
			}
			arc4random_buf(*salt_p, 8);

			for (i = 0; i < 8; i++)
				(*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f];	/* 6 bits */
			(*salt_p)[8] = 0;
		}
#endif				/* !NO_MD5CRYPT_1 */
	}
	assert(*salt_p != NULL);

	/* truncate password if necessary */
	if ((strlen(passwd) > pw_maxlen)) {
		if (!quiet)
			/*
			 * XXX: really we should know how to print a size_t,
			 * not cast it
			 */
			BIO_printf(bio_err, "Warning: truncating password to %u characters\n", (unsigned) pw_maxlen);
		passwd[pw_maxlen] = 0;
	}
	assert(strlen(passwd) <= pw_maxlen);

	/* now compute password hash */
#ifndef OPENSSL_NO_DES
	if (usecrypt)
		hash = DES_crypt(passwd, *salt_p);
#endif
#ifndef NO_MD5CRYPT_1
	if (use1 || useapr1)
		hash = md5crypt(passwd, (use1 ? "1" : "apr1"), *salt_p);
#endif
	assert(hash != NULL);

	if (table && !reverse)
		BIO_printf(out, "%s\t%s\n", passwd, hash);
	else if (table && reverse)
		BIO_printf(out, "%s\t%s\n", hash, passwd);
	else
		BIO_printf(out, "%s\n", hash);
	return 1;

err:
	return 0;
}
#else

int
passwd_main(int argc, char **argv)
{
	fputs("Program not available.\n", stderr)
	return (1);
}
#endif