Annotation of src/usr.bin/ssh/authfile.c, Revision 1.105
1.105 ! djm 1: /* $OpenBSD: authfile.c,v 1.104 2014/03/12 04:51:12 djm Exp $ */
1.1 deraadt 2: /*
1.9 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * This file contains functions for reading and writing identity files, and
7: * for reading the passphrase from the user.
1.14 markus 8: *
1.19 deraadt 9: * As far as I am concerned, the code I have written for this software
10: * can be used freely for any purpose. Any derived versions of this
11: * software must be clearly marked as such, and if the derived work is
12: * incompatible with the protocol description in the RFC file, it must be
13: * called by a name other than "ssh" or "Secure Shell".
14: *
15: *
1.99 markus 16: * Copyright (c) 2000, 2013 Markus Friedl. All rights reserved.
1.19 deraadt 17: *
18: * Redistribution and use in source and binary forms, with or without
19: * modification, are permitted provided that the following conditions
20: * are met:
21: * 1. Redistributions of source code must retain the above copyright
22: * notice, this list of conditions and the following disclaimer.
23: * 2. Redistributions in binary form must reproduce the above copyright
24: * notice, this list of conditions and the following disclaimer in the
25: * documentation and/or other materials provided with the distribution.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
28: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
29: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
30: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
31: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
32: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
33: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
34: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
35: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
36: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.9 deraadt 37: */
1.1 deraadt 38:
1.62 stevesk 39:
40: #include <sys/types.h>
41: #include <sys/stat.h>
1.72 stevesk 42: #include <sys/param.h>
1.76 deraadt 43: #include <sys/uio.h>
1.1 deraadt 44:
1.21 markus 45: #include <openssl/err.h>
1.25 markus 46: #include <openssl/evp.h>
1.15 markus 47: #include <openssl/pem.h>
1.68 stevesk 48:
1.100 markus 49: #include "crypto_api.h"
50:
1.69 stevesk 51: #include <errno.h>
1.68 stevesk 52: #include <fcntl.h>
1.74 stevesk 53: #include <stdio.h>
1.73 stevesk 54: #include <stdlib.h>
1.71 stevesk 55: #include <string.h>
1.70 stevesk 56: #include <unistd.h>
1.15 markus 57:
1.99 markus 58: #include <util.h>
59:
1.76 deraadt 60: #include "xmalloc.h"
1.25 markus 61: #include "cipher.h"
1.1 deraadt 62: #include "buffer.h"
1.25 markus 63: #include "key.h"
1.1 deraadt 64: #include "ssh.h"
1.25 markus 65: #include "log.h"
1.27 itojun 66: #include "authfile.h"
1.44 markus 67: #include "rsa.h"
1.60 dtucker 68: #include "misc.h"
1.61 djm 69: #include "atomicio.h"
1.99 markus 70: #include "uuencode.h"
71:
72: /* openssh private key file format */
73: #define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
74: #define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
75: #define KDFNAME "bcrypt"
76: #define AUTH_MAGIC "openssh-key-v1"
77: #define SALT_LEN 16
78: #define DEFAULT_CIPHERNAME "aes256-cbc"
79: #define DEFAULT_ROUNDS 16
1.1 deraadt 80:
1.88 djm 81: #define MAX_KEY_FILE_SIZE (1024 * 1024)
82:
1.29 markus 83: /* Version identification string for SSH v1 identity files. */
1.26 stevesk 84: static const char authfile_id_string[] =
85: "SSH PRIVATE KEY FILE FORMAT 1.1\n";
1.1 deraadt 86:
1.99 markus 87: static int
88: key_private_to_blob2(Key *prv, Buffer *blob, const char *passphrase,
89: const char *comment, const char *ciphername, int rounds)
90: {
91: u_char *key, *cp, salt[SALT_LEN];
92: size_t keylen, ivlen, blocksize, authlen;
93: u_int len, check;
94: int i, n;
95: const Cipher *c;
96: Buffer encoded, b, kdf;
97: CipherContext ctx;
98: const char *kdfname = KDFNAME;
99:
100: if (rounds <= 0)
101: rounds = DEFAULT_ROUNDS;
102: if (passphrase == NULL || !strlen(passphrase)) {
103: ciphername = "none";
104: kdfname = "none";
105: } else if (ciphername == NULL)
106: ciphername = DEFAULT_CIPHERNAME;
107: else if (cipher_number(ciphername) != SSH_CIPHER_SSH2)
108: fatal("invalid cipher");
109:
110: if ((c = cipher_by_name(ciphername)) == NULL)
111: fatal("unknown cipher name");
112: buffer_init(&kdf);
113: blocksize = cipher_blocksize(c);
114: keylen = cipher_keylen(c);
115: ivlen = cipher_ivlen(c);
116: authlen = cipher_authlen(c);
117: key = xcalloc(1, keylen + ivlen);
118: if (strcmp(kdfname, "none") != 0) {
119: arc4random_buf(salt, SALT_LEN);
120: if (bcrypt_pbkdf(passphrase, strlen(passphrase),
121: salt, SALT_LEN, key, keylen + ivlen, rounds) < 0)
122: fatal("bcrypt_pbkdf failed");
123: buffer_put_string(&kdf, salt, SALT_LEN);
124: buffer_put_int(&kdf, rounds);
125: }
126: cipher_init(&ctx, c, key, keylen, key + keylen , ivlen, 1);
1.103 djm 127: explicit_bzero(key, keylen + ivlen);
1.99 markus 128: free(key);
129:
130: buffer_init(&encoded);
131: buffer_append(&encoded, AUTH_MAGIC, sizeof(AUTH_MAGIC));
132: buffer_put_cstring(&encoded, ciphername);
133: buffer_put_cstring(&encoded, kdfname);
134: buffer_put_string(&encoded, buffer_ptr(&kdf), buffer_len(&kdf));
135: buffer_put_int(&encoded, 1); /* number of keys */
136: key_to_blob(prv, &cp, &len); /* public key */
137: buffer_put_string(&encoded, cp, len);
138:
1.103 djm 139: explicit_bzero(cp, len);
1.99 markus 140: free(cp);
141:
142: buffer_free(&kdf);
143:
144: /* set up the buffer that will be encrypted */
145: buffer_init(&b);
146:
147: /* Random check bytes */
148: check = arc4random();
149: buffer_put_int(&b, check);
150: buffer_put_int(&b, check);
151:
152: /* append private key and comment*/
153: key_private_serialize(prv, &b);
154: buffer_put_cstring(&b, comment);
155:
156: /* padding */
157: i = 0;
158: while (buffer_len(&b) % blocksize)
159: buffer_put_char(&b, ++i & 0xff);
160:
161: /* length */
162: buffer_put_int(&encoded, buffer_len(&b));
163:
164: /* encrypt */
165: cp = buffer_append_space(&encoded, buffer_len(&b) + authlen);
166: if (cipher_crypt(&ctx, 0, cp, buffer_ptr(&b), buffer_len(&b), 0,
167: authlen) != 0)
168: fatal("%s: cipher_crypt failed", __func__);
169: buffer_free(&b);
170: cipher_cleanup(&ctx);
171:
172: /* uuencode */
173: len = 2 * buffer_len(&encoded);
174: cp = xmalloc(len);
175: n = uuencode(buffer_ptr(&encoded), buffer_len(&encoded),
176: (char *)cp, len);
177: if (n < 0)
178: fatal("%s: uuencode", __func__);
179:
180: buffer_clear(blob);
181: buffer_append(blob, MARK_BEGIN, sizeof(MARK_BEGIN) - 1);
182: for (i = 0; i < n; i++) {
183: buffer_put_char(blob, cp[i]);
184: if (i % 70 == 69)
185: buffer_put_char(blob, '\n');
186: }
187: if (i % 70 != 69)
188: buffer_put_char(blob, '\n');
189: buffer_append(blob, MARK_END, sizeof(MARK_END) - 1);
190: free(cp);
191:
192: return buffer_len(blob);
193: }
194:
195: static Key *
196: key_parse_private2(Buffer *blob, int type, const char *passphrase,
197: char **commentp)
198: {
199: u_char *key = NULL, *cp, *salt = NULL, pad, last;
1.105 ! djm 200: char *comment = NULL, *ciphername = NULL, *kdfname = NULL;
! 201: const u_char *kdfp;
1.99 markus 202: u_int keylen = 0, ivlen, blocksize, slen, klen, len, rounds, nkeys;
203: u_int check1, check2, m1len, m2len;
204: size_t authlen;
205: const Cipher *c;
206: Buffer b, encoded, copy, kdf;
207: CipherContext ctx;
208: Key *k = NULL;
209: int dlen, ret, i;
210:
211: buffer_init(&b);
212: buffer_init(&kdf);
213: buffer_init(&encoded);
214: buffer_init(©);
215:
216: /* uudecode */
217: m1len = sizeof(MARK_BEGIN) - 1;
218: m2len = sizeof(MARK_END) - 1;
219: cp = buffer_ptr(blob);
220: len = buffer_len(blob);
221: if (len < m1len || memcmp(cp, MARK_BEGIN, m1len)) {
222: debug("%s: missing begin marker", __func__);
223: goto out;
224: }
225: cp += m1len;
226: len -= m1len;
227: while (len) {
228: if (*cp != '\n' && *cp != '\r')
229: buffer_put_char(&encoded, *cp);
230: last = *cp;
231: len--;
232: cp++;
233: if (last == '\n') {
234: if (len >= m2len && !memcmp(cp, MARK_END, m2len)) {
235: buffer_put_char(&encoded, '\0');
236: break;
237: }
238: }
239: }
240: if (!len) {
241: debug("%s: no end marker", __func__);
242: goto out;
243: }
244: len = buffer_len(&encoded);
245: if ((cp = buffer_append_space(©, len)) == NULL) {
246: error("%s: buffer_append_space", __func__);
247: goto out;
248: }
249: if ((dlen = uudecode(buffer_ptr(&encoded), cp, len)) < 0) {
250: error("%s: uudecode failed", __func__);
251: goto out;
252: }
253: if ((u_int)dlen > len) {
254: error("%s: crazy uudecode length %d > %u", __func__, dlen, len);
255: goto out;
256: }
257: buffer_consume_end(©, len - dlen);
258: if (buffer_len(©) < sizeof(AUTH_MAGIC) ||
259: memcmp(buffer_ptr(©), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
260: error("%s: bad magic", __func__);
261: goto out;
262: }
263: buffer_consume(©, sizeof(AUTH_MAGIC));
264:
265: ciphername = buffer_get_cstring_ret(©, NULL);
266: if (ciphername == NULL ||
267: (c = cipher_by_name(ciphername)) == NULL) {
268: error("%s: unknown cipher name", __func__);
269: goto out;
270: }
271: if ((passphrase == NULL || !strlen(passphrase)) &&
272: strcmp(ciphername, "none") != 0) {
273: /* passphrase required */
274: goto out;
275: }
276: kdfname = buffer_get_cstring_ret(©, NULL);
277: if (kdfname == NULL ||
1.104 djm 278: (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0)) {
1.99 markus 279: error("%s: unknown kdf name", __func__);
280: goto out;
281: }
282: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
283: error("%s: cipher %s requires kdf", __func__, ciphername);
284: goto out;
285: }
286: /* kdf options */
287: kdfp = buffer_get_string_ptr_ret(©, &klen);
288: if (kdfp == NULL) {
289: error("%s: kdf options not set", __func__);
290: goto out;
291: }
292: if (klen > 0) {
293: if ((cp = buffer_append_space(&kdf, klen)) == NULL) {
294: error("%s: kdf alloc failed", __func__);
295: goto out;
296: }
297: memcpy(cp, kdfp, klen);
298: }
299: /* number of keys */
300: if (buffer_get_int_ret(&nkeys, ©) < 0) {
301: error("%s: key counter missing", __func__);
302: goto out;
303: }
304: if (nkeys != 1) {
305: error("%s: only one key supported", __func__);
306: goto out;
307: }
308: /* pubkey */
309: if ((cp = buffer_get_string_ret(©, &len)) == NULL) {
310: error("%s: pubkey not found", __func__);
311: goto out;
312: }
313: free(cp); /* XXX check pubkey against decrypted private key */
314:
315: /* size of encrypted key blob */
316: len = buffer_get_int(©);
317: blocksize = cipher_blocksize(c);
318: authlen = cipher_authlen(c);
319: if (len < blocksize) {
320: error("%s: encrypted data too small", __func__);
321: goto out;
322: }
323: if (len % blocksize) {
324: error("%s: length not multiple of blocksize", __func__);
325: goto out;
326: }
327:
328: /* setup key */
329: keylen = cipher_keylen(c);
330: ivlen = cipher_ivlen(c);
331: key = xcalloc(1, keylen + ivlen);
332: if (!strcmp(kdfname, "bcrypt")) {
333: if ((salt = buffer_get_string_ret(&kdf, &slen)) == NULL) {
334: error("%s: salt not set", __func__);
335: goto out;
336: }
337: if (buffer_get_int_ret(&rounds, &kdf) < 0) {
338: error("%s: rounds not set", __func__);
339: goto out;
340: }
341: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
342: key, keylen + ivlen, rounds) < 0) {
343: error("%s: bcrypt_pbkdf failed", __func__);
344: goto out;
345: }
346: }
347:
348: cp = buffer_append_space(&b, len);
349: cipher_init(&ctx, c, key, keylen, key + keylen, ivlen, 0);
350: ret = cipher_crypt(&ctx, 0, cp, buffer_ptr(©), len, 0, authlen);
351: cipher_cleanup(&ctx);
352: buffer_consume(©, len);
353:
354: /* fail silently on decryption errors */
355: if (ret != 0) {
356: debug("%s: decrypt failed", __func__);
357: goto out;
358: }
359:
360: if (buffer_len(©) != 0) {
361: error("%s: key blob has trailing data (len = %u)", __func__,
362: buffer_len(©));
363: goto out;
364: }
365:
366: /* check bytes */
367: if (buffer_get_int_ret(&check1, &b) < 0 ||
368: buffer_get_int_ret(&check2, &b) < 0) {
369: error("check bytes missing");
370: goto out;
371: }
372: if (check1 != check2) {
373: debug("%s: decrypt failed: 0x%08x != 0x%08x", __func__,
374: check1, check2);
375: goto out;
376: }
377:
378: k = key_private_deserialize(&b);
379:
380: /* comment */
381: comment = buffer_get_cstring_ret(&b, NULL);
382:
383: i = 0;
384: while (buffer_len(&b)) {
385: if (buffer_get_char_ret(&pad, &b) == -1 ||
386: pad != (++i & 0xff)) {
387: error("%s: bad padding", __func__);
388: key_free(k);
389: k = NULL;
390: goto out;
391: }
392: }
393:
394: if (k && commentp) {
395: *commentp = comment;
396: comment = NULL;
397: }
398:
399: /* XXX decode pubkey and check against private */
400: out:
401: free(ciphername);
402: free(kdfname);
403: free(salt);
404: free(comment);
405: if (key)
1.103 djm 406: explicit_bzero(key, keylen + ivlen);
1.99 markus 407: free(key);
408: buffer_free(&encoded);
409: buffer_free(©);
410: buffer_free(&kdf);
411: buffer_free(&b);
412: return k;
413: }
414:
1.10 markus 415: /*
1.86 djm 416: * Serialises the authentication (private) key to a blob, encrypting it with
417: * passphrase. The identification of the blob (lowest 64 bits of n) will
1.10 markus 418: * precede the key to provide identification of the key without needing a
419: * passphrase.
420: */
1.37 itojun 421: static int
1.86 djm 422: key_private_rsa1_to_blob(Key *key, Buffer *blob, const char *passphrase,
1.29 markus 423: const char *comment)
1.1 deraadt 424: {
1.8 markus 425: Buffer buffer, encrypted;
1.45 stevesk 426: u_char buf[100], *cp;
1.86 djm 427: int i, cipher_num;
1.20 markus 428: CipherContext ciphercontext;
1.96 djm 429: const Cipher *cipher;
1.57 avsm 430: u_int32_t rnd;
1.8 markus 431:
1.10 markus 432: /*
433: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
434: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
435: */
1.46 markus 436: cipher_num = (strcmp(passphrase, "") == 0) ?
437: SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
438: if ((cipher = cipher_by_number(cipher_num)) == NULL)
1.20 markus 439: fatal("save_private_key_rsa: bad cipher");
1.8 markus 440:
441: /* This buffer is used to built the secret part of the private key. */
442: buffer_init(&buffer);
443:
444: /* Put checkbytes for checking passphrase validity. */
1.57 avsm 445: rnd = arc4random();
446: buf[0] = rnd & 0xff;
447: buf[1] = (rnd >> 8) & 0xff;
1.8 markus 448: buf[2] = buf[0];
449: buf[3] = buf[1];
450: buffer_append(&buffer, buf, 4);
451:
1.10 markus 452: /*
453: * Store the private key (n and e will not be stored because they
454: * will be stored in plain text, and storing them also in encrypted
455: * format would just give known plaintext).
456: */
1.29 markus 457: buffer_put_bignum(&buffer, key->rsa->d);
458: buffer_put_bignum(&buffer, key->rsa->iqmp);
459: buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
460: buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
1.8 markus 461:
462: /* Pad the part to be encrypted until its size is a multiple of 8. */
463: while (buffer_len(&buffer) % 8 != 0)
464: buffer_put_char(&buffer, 0);
465:
466: /* This buffer will be used to contain the data in the file. */
467: buffer_init(&encrypted);
468:
469: /* First store keyfile id string. */
1.26 stevesk 470: for (i = 0; authfile_id_string[i]; i++)
471: buffer_put_char(&encrypted, authfile_id_string[i]);
1.8 markus 472: buffer_put_char(&encrypted, 0);
473:
474: /* Store cipher type. */
1.46 markus 475: buffer_put_char(&encrypted, cipher_num);
1.8 markus 476: buffer_put_int(&encrypted, 0); /* For future extension */
477:
478: /* Store public key. This will be in plain text. */
1.29 markus 479: buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
480: buffer_put_bignum(&encrypted, key->rsa->n);
481: buffer_put_bignum(&encrypted, key->rsa->e);
1.36 markus 482: buffer_put_cstring(&encrypted, comment);
1.8 markus 483:
484: /* Allocate space for the private part of the key in the buffer. */
1.42 stevesk 485: cp = buffer_append_space(&encrypted, buffer_len(&buffer));
1.8 markus 486:
1.46 markus 487: cipher_set_key_string(&ciphercontext, cipher, passphrase,
488: CIPHER_ENCRYPT);
1.99 markus 489: if (cipher_crypt(&ciphercontext, 0, cp,
490: buffer_ptr(&buffer), buffer_len(&buffer), 0, 0) != 0)
491: fatal("%s: cipher_crypt failed", __func__);
1.46 markus 492: cipher_cleanup(&ciphercontext);
1.103 djm 493: explicit_bzero(&ciphercontext, sizeof(ciphercontext));
1.8 markus 494:
495: /* Destroy temporary data. */
1.103 djm 496: explicit_bzero(buf, sizeof(buf));
1.8 markus 497: buffer_free(&buffer);
498:
1.86 djm 499: buffer_append(blob, buffer_ptr(&encrypted), buffer_len(&encrypted));
1.8 markus 500: buffer_free(&encrypted);
1.86 djm 501:
1.8 markus 502: return 1;
1.1 deraadt 503: }
504:
1.86 djm 505: /* convert SSH v2 key in OpenSSL PEM format */
1.37 itojun 506: static int
1.86 djm 507: key_private_pem_to_blob(Key *key, Buffer *blob, const char *_passphrase,
1.29 markus 508: const char *comment)
1.15 markus 509: {
1.21 markus 510: int success = 0;
1.86 djm 511: int blen, len = strlen(_passphrase);
1.47 markus 512: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
1.77 djm 513: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.86 djm 514: const u_char *bptr;
515: BIO *bio;
1.15 markus 516:
517: if (len > 0 && len <= 4) {
1.31 markus 518: error("passphrase too short: have %d bytes, need > 4", len);
1.15 markus 519: return 0;
520: }
1.86 djm 521: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
522: error("%s: BIO_new failed", __func__);
1.15 markus 523: return 0;
524: }
1.21 markus 525: switch (key->type) {
1.30 markus 526: case KEY_DSA:
1.86 djm 527: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
1.30 markus 528: cipher, passphrase, len, NULL, NULL);
529: break;
1.83 djm 530: case KEY_ECDSA:
1.86 djm 531: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
1.83 djm 532: cipher, passphrase, len, NULL, NULL);
533: break;
1.30 markus 534: case KEY_RSA:
1.86 djm 535: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
1.30 markus 536: cipher, passphrase, len, NULL, NULL);
537: break;
1.15 markus 538: }
1.86 djm 539: if (success) {
540: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0)
541: success = 0;
542: else
543: buffer_append(blob, bptr, blen);
544: }
545: BIO_free(bio);
1.15 markus 546: return success;
547: }
548:
1.86 djm 549: /* Save a key blob to a file */
550: static int
551: key_save_private_blob(Buffer *keybuf, const char *filename)
552: {
553: int fd;
554:
555: if ((fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600)) < 0) {
556: error("open %s failed: %s.", filename, strerror(errno));
557: return 0;
558: }
559: if (atomicio(vwrite, fd, buffer_ptr(keybuf),
560: buffer_len(keybuf)) != buffer_len(keybuf)) {
561: error("write to key file %s failed: %s", filename,
562: strerror(errno));
563: close(fd);
564: unlink(filename);
565: return 0;
566: }
567: close(fd);
568: return 1;
569: }
570:
571: /* Serialise "key" to buffer "blob" */
572: static int
573: key_private_to_blob(Key *key, Buffer *blob, const char *passphrase,
1.99 markus 574: const char *comment, int force_new_format, const char *new_format_cipher,
575: int new_format_rounds)
1.15 markus 576: {
577: switch (key->type) {
1.21 markus 578: case KEY_RSA1:
1.86 djm 579: return key_private_rsa1_to_blob(key, blob, passphrase, comment);
1.15 markus 580: case KEY_DSA:
1.83 djm 581: case KEY_ECDSA:
1.21 markus 582: case KEY_RSA:
1.99 markus 583: if (force_new_format) {
584: return key_private_to_blob2(key, blob, passphrase,
585: comment, new_format_cipher, new_format_rounds);
586: }
1.86 djm 587: return key_private_pem_to_blob(key, blob, passphrase, comment);
1.100 markus 588: case KEY_ED25519:
589: return key_private_to_blob2(key, blob, passphrase,
590: comment, new_format_cipher, new_format_rounds);
1.15 markus 591: default:
1.86 djm 592: error("%s: cannot save key type %d", __func__, key->type);
593: return 0;
1.15 markus 594: }
1.86 djm 595: }
596:
597: int
598: key_save_private(Key *key, const char *filename, const char *passphrase,
1.99 markus 599: const char *comment, int force_new_format, const char *new_format_cipher,
600: int new_format_rounds)
1.86 djm 601: {
602: Buffer keyblob;
603: int success = 0;
604:
605: buffer_init(&keyblob);
1.99 markus 606: if (!key_private_to_blob(key, &keyblob, passphrase, comment,
607: force_new_format, new_format_cipher, new_format_rounds))
1.86 djm 608: goto out;
609: if (!key_save_private_blob(&keyblob, filename))
610: goto out;
611: success = 1;
612: out:
613: buffer_free(&keyblob);
614: return success;
1.15 markus 615: }
616:
1.10 markus 617: /*
1.86 djm 618: * Parse the public, unencrypted portion of a RSA1 key.
1.10 markus 619: */
1.37 itojun 620: static Key *
1.86 djm 621: key_parse_public_rsa1(Buffer *blob, char **commentp)
1.1 deraadt 622: {
1.29 markus 623: Key *pub;
1.92 markus 624: Buffer copy;
1.86 djm 625:
626: /* Check that it is at least big enough to contain the ID string. */
627: if (buffer_len(blob) < sizeof(authfile_id_string)) {
628: debug3("Truncated RSA1 identifier");
629: return NULL;
630: }
631:
632: /*
633: * Make sure it begins with the id string. Consume the id string
634: * from the buffer.
635: */
636: if (memcmp(buffer_ptr(blob), authfile_id_string,
637: sizeof(authfile_id_string)) != 0) {
638: debug3("Incorrect RSA1 identifier");
639: return NULL;
640: }
1.92 markus 641: buffer_init(©);
642: buffer_append(©, buffer_ptr(blob), buffer_len(blob));
643: buffer_consume(©, sizeof(authfile_id_string));
1.86 djm 644:
645: /* Skip cipher type and reserved data. */
1.92 markus 646: (void) buffer_get_char(©); /* cipher type */
647: (void) buffer_get_int(©); /* reserved */
1.86 djm 648:
649: /* Read the public key from the buffer. */
1.92 markus 650: (void) buffer_get_int(©);
1.86 djm 651: pub = key_new(KEY_RSA1);
1.92 markus 652: buffer_get_bignum(©, pub->rsa->n);
653: buffer_get_bignum(©, pub->rsa->e);
1.86 djm 654: if (commentp)
1.92 markus 655: *commentp = buffer_get_string(©, NULL);
1.86 djm 656: /* The encrypted private part is not parsed by this function. */
1.92 markus 657: buffer_free(©);
1.86 djm 658:
659: return pub;
660: }
661:
1.88 djm 662: /* Load a key from a fd into a buffer */
663: int
1.86 djm 664: key_load_file(int fd, const char *filename, Buffer *blob)
665: {
1.88 djm 666: u_char buf[1024];
1.86 djm 667: size_t len;
1.51 fgsch 668: struct stat st;
1.8 markus 669:
1.51 fgsch 670: if (fstat(fd, &st) < 0) {
1.86 djm 671: error("%s: fstat of key file %.200s%sfailed: %.100s", __func__,
672: filename == NULL ? "" : filename,
673: filename == NULL ? "" : " ",
674: strerror(errno));
675: return 0;
1.51 fgsch 676: }
1.88 djm 677: if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 &&
678: st.st_size > MAX_KEY_FILE_SIZE) {
679: toobig:
1.86 djm 680: error("%s: key file %.200s%stoo large", __func__,
681: filename == NULL ? "" : filename,
682: filename == NULL ? "" : " ");
683: return 0;
1.58 djm 684: }
1.93 markus 685: buffer_clear(blob);
1.88 djm 686: for (;;) {
687: if ((len = atomicio(read, fd, buf, sizeof(buf))) == 0) {
688: if (errno == EPIPE)
689: break;
690: debug("%s: read from key file %.200s%sfailed: %.100s",
691: __func__, filename == NULL ? "" : filename,
692: filename == NULL ? "" : " ", strerror(errno));
693: buffer_clear(blob);
1.102 tedu 694: explicit_bzero(buf, sizeof(buf));
1.88 djm 695: return 0;
696: }
697: buffer_append(blob, buf, len);
698: if (buffer_len(blob) > MAX_KEY_FILE_SIZE) {
699: buffer_clear(blob);
1.102 tedu 700: explicit_bzero(buf, sizeof(buf));
1.88 djm 701: goto toobig;
702: }
703: }
1.102 tedu 704: explicit_bzero(buf, sizeof(buf));
1.88 djm 705: if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 &&
706: st.st_size != buffer_len(blob)) {
707: debug("%s: key file %.200s%schanged size while reading",
708: __func__, filename == NULL ? "" : filename,
709: filename == NULL ? "" : " ");
1.86 djm 710: buffer_clear(blob);
711: return 0;
1.8 markus 712: }
1.88 djm 713:
1.86 djm 714: return 1;
715: }
1.8 markus 716:
1.86 djm 717: /*
718: * Loads the public part of the ssh v1 key file. Returns NULL if an error was
719: * encountered (the file does not exist or is not readable), and the key
720: * otherwise.
721: */
722: static Key *
723: key_load_public_rsa1(int fd, const char *filename, char **commentp)
724: {
725: Buffer buffer;
726: Key *pub;
727:
728: buffer_init(&buffer);
729: if (!key_load_file(fd, filename, &buffer)) {
1.8 markus 730: buffer_free(&buffer);
1.29 markus 731: return NULL;
1.8 markus 732: }
733:
1.86 djm 734: pub = key_parse_public_rsa1(&buffer, commentp);
735: if (pub == NULL)
736: debug3("Could not load \"%s\" as a RSA1 public key", filename);
1.1 deraadt 737: buffer_free(&buffer);
1.29 markus 738: return pub;
1.1 deraadt 739: }
740:
1.29 markus 741: /* load public key from private-key file, works only for SSH v1 */
742: Key *
743: key_load_public_type(int type, const char *filename, char **commentp)
1.15 markus 744: {
1.29 markus 745: Key *pub;
746: int fd;
747:
748: if (type == KEY_RSA1) {
749: fd = open(filename, O_RDONLY);
750: if (fd < 0)
751: return NULL;
752: pub = key_load_public_rsa1(fd, filename, commentp);
753: close(fd);
754: return pub;
1.15 markus 755: }
1.29 markus 756: return NULL;
1.15 markus 757: }
758:
1.37 itojun 759: static Key *
1.86 djm 760: key_parse_private_rsa1(Buffer *blob, const char *passphrase, char **commentp)
1.1 deraadt 761: {
1.61 djm 762: int check1, check2, cipher_type;
1.86 djm 763: Buffer decrypted;
1.45 stevesk 764: u_char *cp;
1.20 markus 765: CipherContext ciphercontext;
1.96 djm 766: const Cipher *cipher;
1.29 markus 767: Key *prv = NULL;
1.92 markus 768: Buffer copy;
1.8 markus 769:
1.86 djm 770: /* Check that it is at least big enough to contain the ID string. */
771: if (buffer_len(blob) < sizeof(authfile_id_string)) {
772: debug3("Truncated RSA1 identifier");
1.51 fgsch 773: return NULL;
774: }
1.8 markus 775:
1.10 markus 776: /*
777: * Make sure it begins with the id string. Consume the id string
778: * from the buffer.
779: */
1.86 djm 780: if (memcmp(buffer_ptr(blob), authfile_id_string,
781: sizeof(authfile_id_string)) != 0) {
782: debug3("Incorrect RSA1 identifier");
783: return NULL;
784: }
1.92 markus 785: buffer_init(©);
786: buffer_append(©, buffer_ptr(blob), buffer_len(blob));
787: buffer_consume(©, sizeof(authfile_id_string));
1.28 deraadt 788:
1.8 markus 789: /* Read cipher type. */
1.92 markus 790: cipher_type = buffer_get_char(©);
791: (void) buffer_get_int(©); /* Reserved data. */
1.8 markus 792:
793: /* Read the public key from the buffer. */
1.92 markus 794: (void) buffer_get_int(©);
1.29 markus 795: prv = key_new_private(KEY_RSA1);
796:
1.92 markus 797: buffer_get_bignum(©, prv->rsa->n);
798: buffer_get_bignum(©, prv->rsa->e);
1.29 markus 799: if (commentp)
1.92 markus 800: *commentp = buffer_get_string(©, NULL);
1.8 markus 801: else
1.92 markus 802: (void)buffer_get_string_ptr(©, NULL);
1.8 markus 803:
804: /* Check that it is a supported cipher. */
1.20 markus 805: cipher = cipher_by_number(cipher_type);
806: if (cipher == NULL) {
1.86 djm 807: debug("Unsupported RSA1 cipher %d", cipher_type);
1.92 markus 808: buffer_free(©);
1.8 markus 809: goto fail;
810: }
811: /* Initialize space for decrypted data. */
812: buffer_init(&decrypted);
1.92 markus 813: cp = buffer_append_space(&decrypted, buffer_len(©));
1.8 markus 814:
815: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
1.46 markus 816: cipher_set_key_string(&ciphercontext, cipher, passphrase,
817: CIPHER_DECRYPT);
1.99 markus 818: if (cipher_crypt(&ciphercontext, 0, cp,
819: buffer_ptr(©), buffer_len(©), 0, 0) != 0)
820: fatal("%s: cipher_crypt failed", __func__);
1.46 markus 821: cipher_cleanup(&ciphercontext);
1.103 djm 822: explicit_bzero(&ciphercontext, sizeof(ciphercontext));
1.92 markus 823: buffer_free(©);
1.1 deraadt 824:
1.8 markus 825: check1 = buffer_get_char(&decrypted);
826: check2 = buffer_get_char(&decrypted);
827: if (check1 != buffer_get_char(&decrypted) ||
828: check2 != buffer_get_char(&decrypted)) {
829: if (strcmp(passphrase, "") != 0)
1.86 djm 830: debug("Bad passphrase supplied for RSA1 key");
1.8 markus 831: /* Bad passphrase. */
832: buffer_free(&decrypted);
1.29 markus 833: goto fail;
1.8 markus 834: }
835: /* Read the rest of the private key. */
1.29 markus 836: buffer_get_bignum(&decrypted, prv->rsa->d);
837: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
838: /* in SSL and SSH v1 p and q are exchanged */
839: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
840: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 841:
1.29 markus 842: /* calculate p-1 and q-1 */
1.43 markus 843: rsa_generate_additional_parameters(prv->rsa);
1.8 markus 844:
845: buffer_free(&decrypted);
1.52 markus 846:
847: /* enable blinding */
848: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
1.86 djm 849: error("%s: RSA_blinding_on failed", __func__);
1.52 markus 850: goto fail;
851: }
1.29 markus 852: return prv;
853:
854: fail:
1.97 djm 855: if (commentp != NULL)
856: free(*commentp);
1.29 markus 857: key_free(prv);
858: return NULL;
1.15 markus 859: }
860:
1.86 djm 861: static Key *
862: key_parse_private_pem(Buffer *blob, int type, const char *passphrase,
1.29 markus 863: char **commentp)
1.15 markus 864: {
1.21 markus 865: EVP_PKEY *pk = NULL;
1.29 markus 866: Key *prv = NULL;
1.21 markus 867: char *name = "<no key>";
1.86 djm 868: BIO *bio;
1.15 markus 869:
1.86 djm 870: if ((bio = BIO_new_mem_buf(buffer_ptr(blob),
871: buffer_len(blob))) == NULL) {
872: error("%s: BIO_new_mem_buf failed", __func__);
1.29 markus 873: return NULL;
1.15 markus 874: }
1.86 djm 875:
876: pk = PEM_read_bio_PrivateKey(bio, NULL, NULL, (char *)passphrase);
877: BIO_free(bio);
1.21 markus 878: if (pk == NULL) {
1.86 djm 879: debug("%s: PEM_read_PrivateKey failed", __func__);
1.21 markus 880: (void)ERR_get_error();
1.29 markus 881: } else if (pk->type == EVP_PKEY_RSA &&
1.41 deraadt 882: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 883: prv = key_new(KEY_UNSPEC);
884: prv->rsa = EVP_PKEY_get1_RSA(pk);
885: prv->type = KEY_RSA;
886: name = "rsa w/o comment";
1.21 markus 887: #ifdef DEBUG_PK
1.29 markus 888: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 889: #endif
1.52 markus 890: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
1.86 djm 891: error("%s: RSA_blinding_on failed", __func__);
1.52 markus 892: key_free(prv);
893: prv = NULL;
894: }
1.29 markus 895: } else if (pk->type == EVP_PKEY_DSA &&
1.41 deraadt 896: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 897: prv = key_new(KEY_UNSPEC);
898: prv->dsa = EVP_PKEY_get1_DSA(pk);
899: prv->type = KEY_DSA;
900: name = "dsa w/o comment";
1.21 markus 901: #ifdef DEBUG_PK
1.29 markus 902: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 903: #endif
1.83 djm 904: } else if (pk->type == EVP_PKEY_EC &&
905: (type == KEY_UNSPEC||type==KEY_ECDSA)) {
906: prv = key_new(KEY_UNSPEC);
907: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
908: prv->type = KEY_ECDSA;
1.85 djm 909: if ((prv->ecdsa_nid = key_ecdsa_key_to_nid(prv->ecdsa)) == -1 ||
910: key_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
911: key_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
1.83 djm 912: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
913: key_ec_validate_private(prv->ecdsa) != 0) {
914: error("%s: bad ECDSA key", __func__);
915: key_free(prv);
916: prv = NULL;
917: }
1.84 djm 918: name = "ecdsa w/o comment";
1.83 djm 919: #ifdef DEBUG_PK
1.85 djm 920: if (prv != NULL && prv->ecdsa != NULL)
1.83 djm 921: key_dump_ec_key(prv->ecdsa);
922: #endif
1.15 markus 923: } else {
1.86 djm 924: error("%s: PEM_read_PrivateKey: mismatch or "
925: "unknown EVP_PKEY save_type %d", __func__, pk->save_type);
1.15 markus 926: }
1.21 markus 927: if (pk != NULL)
928: EVP_PKEY_free(pk);
1.29 markus 929: if (prv != NULL && commentp)
930: *commentp = xstrdup(name);
931: debug("read PEM private key done: type %s",
932: prv ? key_type(prv) : "<unknown>");
933: return prv;
1.15 markus 934: }
935:
1.86 djm 936: Key *
937: key_load_private_pem(int fd, int type, const char *passphrase,
938: char **commentp)
939: {
940: Buffer buffer;
941: Key *prv;
942:
943: buffer_init(&buffer);
944: if (!key_load_file(fd, NULL, &buffer)) {
945: buffer_free(&buffer);
946: return NULL;
947: }
948: prv = key_parse_private_pem(&buffer, type, passphrase, commentp);
949: buffer_free(&buffer);
950: return prv;
951: }
952:
1.63 dtucker 953: int
1.29 markus 954: key_perm_ok(int fd, const char *filename)
1.15 markus 955: {
956: struct stat st;
957:
1.38 markus 958: if (fstat(fd, &st) < 0)
959: return 0;
960: /*
961: * if a key owned by the user is accessed, then we check the
962: * permissions of the file. if the key owned by a different user,
963: * then we don't care.
964: */
965: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 966: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
967: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
968: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.38 markus 969: error("Permissions 0%3.3o for '%s' are too open.",
1.54 djm 970: (u_int)st.st_mode & 0777, filename);
1.15 markus 971: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 972: error("This private key will be ignored.");
1.15 markus 973: return 0;
974: }
1.29 markus 975: return 1;
976: }
977:
1.86 djm 978: static Key *
979: key_parse_private_type(Buffer *blob, int type, const char *passphrase,
980: char **commentp)
981: {
1.99 markus 982: Key *k;
983:
1.86 djm 984: switch (type) {
985: case KEY_RSA1:
986: return key_parse_private_rsa1(blob, passphrase, commentp);
987: case KEY_DSA:
988: case KEY_ECDSA:
989: case KEY_RSA:
1.100 markus 990: return key_parse_private_pem(blob, type, passphrase, commentp);
991: case KEY_ED25519:
992: return key_parse_private2(blob, type, passphrase, commentp);
1.86 djm 993: case KEY_UNSPEC:
1.99 markus 994: if ((k = key_parse_private2(blob, type, passphrase, commentp)))
995: return k;
1.86 djm 996: return key_parse_private_pem(blob, type, passphrase, commentp);
997: default:
1.90 djm 998: error("%s: cannot parse key type %d", __func__, type);
1.86 djm 999: break;
1000: }
1001: return NULL;
1002: }
1003:
1.29 markus 1004: Key *
1005: key_load_private_type(int type, const char *filename, const char *passphrase,
1.67 dtucker 1006: char **commentp, int *perm_ok)
1.29 markus 1007: {
1008: int fd;
1.86 djm 1009: Key *ret;
1010: Buffer buffer;
1.29 markus 1011:
1012: fd = open(filename, O_RDONLY);
1.78 dtucker 1013: if (fd < 0) {
1014: debug("could not open key file '%s': %s", filename,
1015: strerror(errno));
1016: if (perm_ok != NULL)
1017: *perm_ok = 0;
1.79 dtucker 1018: return NULL;
1.78 dtucker 1019: }
1.29 markus 1020: if (!key_perm_ok(fd, filename)) {
1.67 dtucker 1021: if (perm_ok != NULL)
1022: *perm_ok = 0;
1.31 markus 1023: error("bad permissions: ignore key: %s", filename);
1.29 markus 1024: close(fd);
1025: return NULL;
1026: }
1.67 dtucker 1027: if (perm_ok != NULL)
1028: *perm_ok = 1;
1.86 djm 1029:
1030: buffer_init(&buffer);
1031: if (!key_load_file(fd, filename, &buffer)) {
1032: buffer_free(&buffer);
1.28 deraadt 1033: close(fd);
1.86 djm 1034: return NULL;
1.15 markus 1035: }
1.86 djm 1036: close(fd);
1037: ret = key_parse_private_type(&buffer, type, passphrase, commentp);
1038: buffer_free(&buffer);
1039: return ret;
1.29 markus 1040: }
1041:
1042: Key *
1.88 djm 1043: key_parse_private(Buffer *buffer, const char *filename,
1044: const char *passphrase, char **commentp)
1045: {
1046: Key *pub, *prv;
1047:
1048: /* it's a SSH v1 key if the public key part is readable */
1.92 markus 1049: pub = key_parse_public_rsa1(buffer, commentp);
1.88 djm 1050: if (pub == NULL) {
1051: prv = key_parse_private_type(buffer, KEY_UNSPEC,
1052: passphrase, NULL);
1053: /* use the filename as a comment for PEM */
1054: if (commentp && prv)
1055: *commentp = xstrdup(filename);
1056: } else {
1057: key_free(pub);
1058: /* key_parse_public_rsa1() has already loaded the comment */
1059: prv = key_parse_private_type(buffer, KEY_RSA1, passphrase,
1060: NULL);
1061: }
1062: return prv;
1063: }
1064:
1065: Key *
1.29 markus 1066: key_load_private(const char *filename, const char *passphrase,
1067: char **commentp)
1068: {
1.88 djm 1069: Key *prv;
1070: Buffer buffer;
1.29 markus 1071: int fd;
1072:
1073: fd = open(filename, O_RDONLY);
1.78 dtucker 1074: if (fd < 0) {
1075: debug("could not open key file '%s': %s", filename,
1076: strerror(errno));
1.29 markus 1077: return NULL;
1.78 dtucker 1078: }
1.29 markus 1079: if (!key_perm_ok(fd, filename)) {
1.31 markus 1080: error("bad permissions: ignore key: %s", filename);
1.29 markus 1081: close(fd);
1082: return NULL;
1083: }
1.86 djm 1084:
1085: buffer_init(&buffer);
1086: if (!key_load_file(fd, filename, &buffer)) {
1087: buffer_free(&buffer);
1088: close(fd);
1089: return NULL;
1090: }
1091: close(fd);
1092:
1.88 djm 1093: prv = key_parse_private(&buffer, filename, passphrase, commentp);
1.86 djm 1094: buffer_free(&buffer);
1.34 markus 1095: return prv;
1.18 markus 1096: }
1097:
1.37 itojun 1098: static int
1.29 markus 1099: key_try_load_public(Key *k, const char *filename, char **commentp)
1.18 markus 1100: {
1101: FILE *f;
1.59 dtucker 1102: char line[SSH_MAX_PUBKEY_BYTES];
1.18 markus 1103: char *cp;
1.60 dtucker 1104: u_long linenum = 0;
1.18 markus 1105:
1106: f = fopen(filename, "r");
1107: if (f != NULL) {
1.59 dtucker 1108: while (read_keyfile_line(f, filename, line, sizeof(line),
1109: &linenum) != -1) {
1.18 markus 1110: cp = line;
1.40 deraadt 1111: switch (*cp) {
1.18 markus 1112: case '#':
1113: case '\n':
1114: case '\0':
1115: continue;
1116: }
1.89 djm 1117: /* Abort loading if this looks like a private key */
1118: if (strncmp(cp, "-----BEGIN", 10) == 0)
1119: break;
1.18 markus 1120: /* Skip leading whitespace. */
1121: for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
1122: ;
1123: if (*cp) {
1.21 markus 1124: if (key_read(k, &cp) == 1) {
1.91 djm 1125: cp[strcspn(cp, "\r\n")] = '\0';
1126: if (commentp) {
1127: *commentp = xstrdup(*cp ?
1128: cp : filename);
1129: }
1.18 markus 1130: fclose(f);
1131: return 1;
1132: }
1133: }
1134: }
1135: fclose(f);
1136: }
1137: return 0;
1138: }
1139:
1.29 markus 1140: /* load public key from ssh v1 private or any pubkey file */
1141: Key *
1142: key_load_public(const char *filename, char **commentp)
1.18 markus 1143: {
1.29 markus 1144: Key *pub;
1145: char file[MAXPATHLEN];
1.18 markus 1146:
1.53 markus 1147: /* try rsa1 private key */
1.29 markus 1148: pub = key_load_public_type(KEY_RSA1, filename, commentp);
1149: if (pub != NULL)
1150: return pub;
1.53 markus 1151:
1152: /* try rsa1 public key */
1153: pub = key_new(KEY_RSA1);
1154: if (key_try_load_public(pub, filename, commentp) == 1)
1155: return pub;
1156: key_free(pub);
1157:
1158: /* try ssh2 public key */
1.29 markus 1159: pub = key_new(KEY_UNSPEC);
1160: if (key_try_load_public(pub, filename, commentp) == 1)
1161: return pub;
1162: if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
1163: (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
1164: (key_try_load_public(pub, file, commentp) == 1))
1165: return pub;
1.81 djm 1166: key_free(pub);
1167: return NULL;
1168: }
1169:
1170: /* Load the certificate associated with the named private key */
1171: Key *
1172: key_load_cert(const char *filename)
1173: {
1174: Key *pub;
1.82 djm 1175: char *file;
1.81 djm 1176:
1177: pub = key_new(KEY_UNSPEC);
1.82 djm 1178: xasprintf(&file, "%s-cert.pub", filename);
1179: if (key_try_load_public(pub, file, NULL) == 1) {
1.97 djm 1180: free(file);
1.81 djm 1181: return pub;
1.82 djm 1182: }
1.97 djm 1183: free(file);
1.81 djm 1184: key_free(pub);
1185: return NULL;
1186: }
1187:
1188: /* Load private key and certificate */
1189: Key *
1190: key_load_private_cert(int type, const char *filename, const char *passphrase,
1191: int *perm_ok)
1192: {
1193: Key *key, *pub;
1194:
1195: switch (type) {
1196: case KEY_RSA:
1197: case KEY_DSA:
1.83 djm 1198: case KEY_ECDSA:
1.101 djm 1199: case KEY_ED25519:
1.81 djm 1200: break;
1201: default:
1202: error("%s: unsupported key type", __func__);
1203: return NULL;
1204: }
1205:
1206: if ((key = key_load_private_type(type, filename,
1207: passphrase, NULL, perm_ok)) == NULL)
1208: return NULL;
1209:
1210: if ((pub = key_load_cert(filename)) == NULL) {
1211: key_free(key);
1212: return NULL;
1213: }
1214:
1215: /* Make sure the private key matches the certificate */
1216: if (key_equal_public(key, pub) == 0) {
1217: error("%s: certificate does not match private key %s",
1218: __func__, filename);
1219: } else if (key_to_certified(key, key_cert_is_legacy(pub)) != 0) {
1220: error("%s: key_to_certified failed", __func__);
1221: } else {
1222: key_cert_copy(pub, key);
1223: key_free(pub);
1224: return key;
1225: }
1226:
1227: key_free(key);
1.29 markus 1228: key_free(pub);
1229: return NULL;
1.1 deraadt 1230: }
1.80 djm 1231:
1232: /*
1233: * Returns 1 if the specified "key" is listed in the file "filename",
1234: * 0 if the key is not listed or -1 on error.
1235: * If strict_type is set then the key type must match exactly,
1236: * otherwise a comparison that ignores certficiate data is performed.
1237: */
1238: int
1239: key_in_file(Key *key, const char *filename, int strict_type)
1240: {
1241: FILE *f;
1242: char line[SSH_MAX_PUBKEY_BYTES];
1243: char *cp;
1244: u_long linenum = 0;
1245: int ret = 0;
1246: Key *pub;
1247: int (*key_compare)(const Key *, const Key *) = strict_type ?
1248: key_equal : key_equal_public;
1249:
1250: if ((f = fopen(filename, "r")) == NULL) {
1251: if (errno == ENOENT) {
1252: debug("%s: keyfile \"%s\" missing", __func__, filename);
1253: return 0;
1254: } else {
1255: error("%s: could not open keyfile \"%s\": %s", __func__,
1256: filename, strerror(errno));
1257: return -1;
1258: }
1259: }
1260:
1261: while (read_keyfile_line(f, filename, line, sizeof(line),
1262: &linenum) != -1) {
1263: cp = line;
1264:
1265: /* Skip leading whitespace. */
1266: for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
1267: ;
1268:
1269: /* Skip comments and empty lines */
1270: switch (*cp) {
1271: case '#':
1272: case '\n':
1273: case '\0':
1274: continue;
1275: }
1276:
1277: pub = key_new(KEY_UNSPEC);
1278: if (key_read(pub, &cp) != 1) {
1279: key_free(pub);
1280: continue;
1281: }
1282: if (key_compare(key, pub)) {
1283: ret = 1;
1284: key_free(pub);
1285: break;
1286: }
1287: key_free(pub);
1288: }
1289: fclose(f);
1290: return ret;
1291: }
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