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1.6 ! semarie 1: /* $OpenBSD: passwd.c,v 1.5 2015/10/10 22:28:51 doug Exp $ */
1.1 jsing 2:
3: #if defined OPENSSL_NO_MD5
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:
18: #ifndef OPENSSL_NO_DES
19: #include <openssl/des.h>
20: #endif
21:
22: #ifndef NO_MD5CRYPT_1
23: #include <openssl/md5.h>
24: #endif
25:
26: static unsigned const char cov_2char[64] = {
27: /* from crypto/des/fcrypt.c */
28: 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
29: 0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44,
30: 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C,
31: 0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54,
32: 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62,
33: 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
34: 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72,
35: 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
36: };
37:
38: static int
39: do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
40: char *passwd, BIO * out, int quiet, int table, int reverse,
41: size_t pw_maxlen, int usecrypt, int use1, int useapr1);
42:
1.3 jsing 43: static struct {
44: char *infile;
45: int in_stdin;
46: int noverify;
47: int quiet;
48: int reverse;
49: char *salt;
50: int table;
51: int use1;
52: int useapr1;
53: int usecrypt;
54: } passwd_config;
55:
56: static struct option passwd_options[] = {
57: #ifndef NO_MD5CRYPT_1
58: {
59: .name = "1",
60: .desc = "Use MD5 based BSD password algorithm 1",
61: .type = OPTION_FLAG,
62: .opt.flag = &passwd_config.use1,
63: },
64: {
65: .name = "apr1",
66: .desc = "Use apr1 algorithm (Apache variant of BSD algorithm)",
67: .type = OPTION_FLAG,
68: .opt.flag = &passwd_config.useapr1,
69: },
70: #endif
71: #ifndef OPENSSL_NO_DES
72: {
73: .name = "crypt",
74: .desc = "Use crypt algorithm (default)",
75: .type = OPTION_FLAG,
76: .opt.flag = &passwd_config.usecrypt,
77: },
78: #endif
79: {
80: .name = "in",
81: .argname = "file",
82: .desc = "Read passwords from specified file",
83: .type = OPTION_ARG,
84: .opt.arg = &passwd_config.infile,
85: },
86: {
87: .name = "noverify",
88: .desc = "Do not verify password",
89: .type = OPTION_FLAG,
90: .opt.flag = &passwd_config.noverify,
91: },
92: {
93: .name = "quiet",
94: .desc = "Do not output warnings",
95: .type = OPTION_FLAG,
96: .opt.flag = &passwd_config.quiet,
97: },
98: {
99: .name = "reverse",
100: .desc = "Reverse table columns (requires -table)",
101: .type = OPTION_FLAG,
102: .opt.flag = &passwd_config.reverse,
103: },
104: {
105: .name = "salt",
106: .argname = "string",
107: .desc = "Use specified salt",
108: .type = OPTION_ARG,
109: .opt.arg = &passwd_config.salt,
110: },
111: {
112: .name = "stdin",
113: .desc = "Read passwords from stdin",
114: .type = OPTION_FLAG,
115: .opt.flag = &passwd_config.in_stdin,
116: },
117: {
118: .name = "table",
119: .desc = "Output cleartext and hashed passwords (tab separated)",
120: .type = OPTION_FLAG,
121: .opt.flag = &passwd_config.table,
122: },
123: { NULL },
124: };
125:
126: static void
127: passwd_usage(void)
128: {
129: fprintf(stderr, "usage: passwd [-1 | -apr1 | -crypt] [-in file] "
130: "[-noverify] [-quiet]\n"
131: " [-reverse] [-salt string] [-stdin] [-table] [password]\n\n");
132: options_usage(passwd_options);
133: }
1.1 jsing 134:
135: int
136: passwd_main(int argc, char **argv)
137: {
1.3 jsing 138: char *passwd = NULL, **passwds = NULL;
1.1 jsing 139: char *salt_malloc = NULL, *passwd_malloc = NULL;
140: size_t passwd_malloc_size = 0;
141: BIO *in = NULL, *out = NULL;
1.3 jsing 142: int badopt = 0;
143: int passed_salt = 0;
1.1 jsing 144: size_t pw_maxlen = 0;
1.3 jsing 145: int argsused;
146: int ret = 1;
1.5 doug 147:
148: if (single_execution) {
1.6 ! semarie 149: if (pledge("stdio rpath wpath cpath tty", NULL) == -1)
1.5 doug 150: perror("pledge");
151: }
1.1 jsing 152:
1.3 jsing 153: memset(&passwd_config, 0, sizeof(passwd_config));
154:
155: if (options_parse(argc, argv, passwd_options, NULL, &argsused) != 0) {
156: passwd_usage();
1.1 jsing 157: goto err;
1.3 jsing 158: }
1.1 jsing 159:
1.3 jsing 160: if (argsused < argc)
161: passwds = &argv[argsused];
162: if (passwd_config.salt != NULL)
163: passed_salt = 1;
164:
165: if (!passwd_config.usecrypt && !passwd_config.use1 &&
166: !passwd_config.useapr1)
167: passwd_config.usecrypt = 1; /* use default */
168: if (passwd_config.usecrypt + passwd_config.use1 +
169: passwd_config.useapr1 > 1)
170: badopt = 1; /* conflicting options */
1.1 jsing 171:
1.3 jsing 172: /* Reject unsupported algorithms */
1.1 jsing 173: #ifdef OPENSSL_NO_DES
1.3 jsing 174: if (passwd_config.usecrypt)
1.1 jsing 175: badopt = 1;
176: #endif
177: #ifdef NO_MD5CRYPT_1
1.3 jsing 178: if (passwd_config.use1 || passwd_config.useapr1)
1.1 jsing 179: badopt = 1;
180: #endif
181:
182: if (badopt) {
1.3 jsing 183: passwd_usage();
184: goto err;
185: }
1.1 jsing 186:
1.3 jsing 187: if ((out = BIO_new(BIO_s_file())) == NULL)
1.1 jsing 188: goto err;
1.3 jsing 189: BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
190:
191: if (passwd_config.infile != NULL || passwd_config.in_stdin) {
192: if ((in = BIO_new(BIO_s_file())) == NULL)
1.1 jsing 193: goto err;
1.3 jsing 194: if (passwd_config.infile != NULL) {
195: assert(passwd_config.in_stdin == 0);
196: if (BIO_read_filename(in, passwd_config.infile) <= 0)
1.1 jsing 197: goto err;
198: } else {
1.3 jsing 199: assert(passwd_config.in_stdin);
1.1 jsing 200: BIO_set_fp(in, stdin, BIO_NOCLOSE);
201: }
202: }
1.3 jsing 203: if (passwd_config.usecrypt)
1.1 jsing 204: pw_maxlen = 8;
1.3 jsing 205: else if (passwd_config.use1 || passwd_config.useapr1)
1.1 jsing 206: pw_maxlen = 256;/* arbitrary limit, should be enough for most
207: * passwords */
208:
209: if (passwds == NULL) {
210: /* no passwords on the command line */
211:
212: passwd_malloc_size = pw_maxlen + 2;
213: /* longer than necessary so that we can warn about truncation */
214: passwd = passwd_malloc = malloc(passwd_malloc_size);
215: if (passwd_malloc == NULL)
216: goto err;
217: }
1.3 jsing 218: if (in == NULL && passwds == NULL) {
1.1 jsing 219: /* build a null-terminated list */
220: static char *passwds_static[2] = {NULL, NULL};
221:
222: passwds = passwds_static;
223: if (in == NULL)
1.3 jsing 224: if (EVP_read_pw_string(passwd_malloc,
225: passwd_malloc_size, "Password: ",
226: !(passed_salt || passwd_config.noverify)) != 0)
1.1 jsing 227: goto err;
228: passwds[0] = passwd_malloc;
229: }
230: if (in == NULL) {
231: assert(passwds != NULL);
232: assert(*passwds != NULL);
233:
1.3 jsing 234: do { /* loop over list of passwords */
1.1 jsing 235: passwd = *passwds++;
1.3 jsing 236: if (!do_passwd(passed_salt, &passwd_config.salt,
237: &salt_malloc, passwd, out, passwd_config.quiet,
238: passwd_config.table, passwd_config.reverse,
239: pw_maxlen, passwd_config.usecrypt,
240: passwd_config.use1, passwd_config.useapr1))
1.1 jsing 241: goto err;
1.3 jsing 242: } while (*passwds != NULL);
243: } else {
1.1 jsing 244: int done;
245:
246: assert(passwd != NULL);
247: do {
248: int r = BIO_gets(in, passwd, pw_maxlen + 1);
249: if (r > 0) {
250: char *c = (strchr(passwd, '\n'));
251: if (c != NULL)
252: *c = 0; /* truncate at newline */
253: else {
254: /* ignore rest of line */
255: char trash[BUFSIZ];
256: do
257: r = BIO_gets(in, trash, sizeof trash);
258: while ((r > 0) && (!strchr(trash, '\n')));
259: }
260:
1.3 jsing 261: if (!do_passwd(passed_salt, &passwd_config.salt,
262: &salt_malloc, passwd, out,
263: passwd_config.quiet, passwd_config.table,
264: passwd_config.reverse, pw_maxlen,
265: passwd_config.usecrypt, passwd_config.use1,
266: passwd_config.useapr1))
1.1 jsing 267: goto err;
268: }
269: done = (r <= 0);
1.3 jsing 270: } while (!done);
1.1 jsing 271: }
272: ret = 0;
273:
274: err:
275: ERR_print_errors(bio_err);
1.3 jsing 276:
1.1 jsing 277: free(salt_malloc);
278: free(passwd_malloc);
1.3 jsing 279:
1.1 jsing 280: BIO_free(in);
1.3 jsing 281: BIO_free_all(out);
1.1 jsing 282:
283: return (ret);
284: }
285:
286:
287: #ifndef NO_MD5CRYPT_1
288: /* MD5-based password algorithm (should probably be available as a library
289: * function; then the static buffer would not be acceptable).
290: * For magic string "1", this should be compatible to the MD5-based BSD
291: * password algorithm.
292: * For 'magic' string "apr1", this is compatible to the MD5-based Apache
293: * password algorithm.
294: * (Apparently, the Apache password algorithm is identical except that the
295: * 'magic' string was changed -- the laziest application of the NIH principle
296: * I've ever encountered.)
297: */
298: static char *
299: md5crypt(const char *passwd, const char *magic, const char *salt)
300: {
301: static char out_buf[6 + 9 + 24 + 2]; /* "$apr1$..salt..$.......md5h
302: * ash..........\0" */
303: unsigned char buf[MD5_DIGEST_LENGTH];
304: char *salt_out;
305: int n;
306: unsigned int i;
307: EVP_MD_CTX md, md2;
308: size_t passwd_len, salt_len;
309:
310: passwd_len = strlen(passwd);
311: out_buf[0] = '$';
312: out_buf[1] = 0;
313: assert(strlen(magic) <= 4); /* "1" or "apr1" */
314: strlcat(out_buf, magic, sizeof(out_buf));
315: strlcat(out_buf, "$", sizeof(out_buf));
316: strlcat(out_buf, salt, sizeof(out_buf));
317: assert(strlen(out_buf) <= 6 + 8); /* "$apr1$..salt.." */
318: salt_out = out_buf + 2 + strlen(magic);
319: salt_len = strlen(salt_out);
320: assert(salt_len <= 8);
321:
322: EVP_MD_CTX_init(&md);
323: EVP_DigestInit_ex(&md, EVP_md5(), NULL);
324: EVP_DigestUpdate(&md, passwd, passwd_len);
325: EVP_DigestUpdate(&md, "$", 1);
326: EVP_DigestUpdate(&md, magic, strlen(magic));
327: EVP_DigestUpdate(&md, "$", 1);
328: EVP_DigestUpdate(&md, salt_out, salt_len);
329:
330: EVP_MD_CTX_init(&md2);
331: EVP_DigestInit_ex(&md2, EVP_md5(), NULL);
332: EVP_DigestUpdate(&md2, passwd, passwd_len);
333: EVP_DigestUpdate(&md2, salt_out, salt_len);
334: EVP_DigestUpdate(&md2, passwd, passwd_len);
335: EVP_DigestFinal_ex(&md2, buf, NULL);
336:
337: for (i = passwd_len; i > sizeof buf; i -= sizeof buf)
338: EVP_DigestUpdate(&md, buf, sizeof buf);
339: EVP_DigestUpdate(&md, buf, i);
340:
341: n = passwd_len;
342: while (n) {
343: EVP_DigestUpdate(&md, (n & 1) ? "\0" : passwd, 1);
344: n >>= 1;
345: }
346: EVP_DigestFinal_ex(&md, buf, NULL);
347:
348: for (i = 0; i < 1000; i++) {
349: EVP_DigestInit_ex(&md2, EVP_md5(), NULL);
350: EVP_DigestUpdate(&md2, (i & 1) ? (unsigned const char *) passwd : buf,
351: (i & 1) ? passwd_len : sizeof buf);
352: if (i % 3)
353: EVP_DigestUpdate(&md2, salt_out, salt_len);
354: if (i % 7)
355: EVP_DigestUpdate(&md2, passwd, passwd_len);
356: EVP_DigestUpdate(&md2, (i & 1) ? buf : (unsigned const char *) passwd,
357: (i & 1) ? sizeof buf : passwd_len);
358: EVP_DigestFinal_ex(&md2, buf, NULL);
359: }
360: EVP_MD_CTX_cleanup(&md2);
361:
362: {
363: /* transform buf into output string */
364:
365: unsigned char buf_perm[sizeof buf];
366: int dest, source;
367: char *output;
368:
369: /* silly output permutation */
370: for (dest = 0, source = 0; dest < 14; dest++, source = (source + 6) % 17)
371: buf_perm[dest] = buf[source];
372: buf_perm[14] = buf[5];
373: buf_perm[15] = buf[11];
374: assert(16 == sizeof buf_perm);
375:
376: output = salt_out + salt_len;
377: assert(output == out_buf + strlen(out_buf));
378:
379: *output++ = '$';
380:
381: for (i = 0; i < 15; i += 3) {
382: *output++ = cov_2char[buf_perm[i + 2] & 0x3f];
383: *output++ = cov_2char[((buf_perm[i + 1] & 0xf) << 2) |
384: (buf_perm[i + 2] >> 6)];
385: *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
386: (buf_perm[i + 1] >> 4)];
387: *output++ = cov_2char[buf_perm[i] >> 2];
388: }
389: assert(i == 15);
390: *output++ = cov_2char[buf_perm[i] & 0x3f];
391: *output++ = cov_2char[buf_perm[i] >> 6];
392: *output = 0;
393: assert(strlen(out_buf) < sizeof(out_buf));
394: }
395: EVP_MD_CTX_cleanup(&md);
396:
397: return out_buf;
398: }
399: #endif
400:
401:
402: static int
403: do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
404: char *passwd, BIO * out, int quiet, int table, int reverse,
405: size_t pw_maxlen, int usecrypt, int use1, int useapr1)
406: {
407: char *hash = NULL;
408:
409: assert(salt_p != NULL);
410: assert(salt_malloc_p != NULL);
411:
412: /* first make sure we have a salt */
413: if (!passed_salt) {
414: #ifndef OPENSSL_NO_DES
415: if (usecrypt) {
416: if (*salt_malloc_p == NULL) {
417: *salt_p = *salt_malloc_p = malloc(3);
418: if (*salt_malloc_p == NULL)
419: goto err;
420: }
1.2 jsing 421: arc4random_buf(*salt_p, 2);
1.1 jsing 422: (*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
423: (*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
424: (*salt_p)[2] = 0;
425: }
426: #endif /* !OPENSSL_NO_DES */
427:
428: #ifndef NO_MD5CRYPT_1
429: if (use1 || useapr1) {
430: int i;
431:
432: if (*salt_malloc_p == NULL) {
433: *salt_p = *salt_malloc_p = malloc(9);
434: if (*salt_malloc_p == NULL)
435: goto err;
436: }
1.2 jsing 437: arc4random_buf(*salt_p, 8);
1.1 jsing 438:
439: for (i = 0; i < 8; i++)
440: (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
441: (*salt_p)[8] = 0;
442: }
443: #endif /* !NO_MD5CRYPT_1 */
444: }
445: assert(*salt_p != NULL);
446:
447: /* truncate password if necessary */
448: if ((strlen(passwd) > pw_maxlen)) {
449: if (!quiet)
450: /*
451: * XXX: really we should know how to print a size_t,
452: * not cast it
453: */
454: BIO_printf(bio_err, "Warning: truncating password to %u characters\n", (unsigned) pw_maxlen);
455: passwd[pw_maxlen] = 0;
456: }
457: assert(strlen(passwd) <= pw_maxlen);
458:
459: /* now compute password hash */
460: #ifndef OPENSSL_NO_DES
461: if (usecrypt)
462: hash = DES_crypt(passwd, *salt_p);
463: #endif
464: #ifndef NO_MD5CRYPT_1
465: if (use1 || useapr1)
466: hash = md5crypt(passwd, (use1 ? "1" : "apr1"), *salt_p);
467: #endif
468: assert(hash != NULL);
469:
470: if (table && !reverse)
471: BIO_printf(out, "%s\t%s\n", passwd, hash);
472: else if (table && reverse)
473: BIO_printf(out, "%s\t%s\n", hash, passwd);
474: else
475: BIO_printf(out, "%s\n", hash);
476: return 1;
477:
478: err:
479: return 0;
480: }
481: #else
482:
483: int
484: passwd_main(int argc, char **argv)
485: {
486: fputs("Program not available.\n", stderr)
487: return (1);
488: }
489: #endif