Annotation of src/usr.bin/ssh/authfile.c, Revision 1.100
1.100 ! markus 1: /* $OpenBSD: authfile.c,v 1.99 2013/12/06 13:34:54 markus 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);
127: memset(key, 0, keylen + ivlen);
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:
139: memset(cp, 0, len);
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;
200: char *comment = NULL, *ciphername = NULL, *kdfname = NULL, *kdfp;
201: u_int keylen = 0, ivlen, blocksize, slen, klen, len, rounds, nkeys;
202: u_int check1, check2, m1len, m2len;
203: size_t authlen;
204: const Cipher *c;
205: Buffer b, encoded, copy, kdf;
206: CipherContext ctx;
207: Key *k = NULL;
208: int dlen, ret, i;
209:
210: buffer_init(&b);
211: buffer_init(&kdf);
212: buffer_init(&encoded);
213: buffer_init(©);
214:
215: /* uudecode */
216: m1len = sizeof(MARK_BEGIN) - 1;
217: m2len = sizeof(MARK_END) - 1;
218: cp = buffer_ptr(blob);
219: len = buffer_len(blob);
220: if (len < m1len || memcmp(cp, MARK_BEGIN, m1len)) {
221: debug("%s: missing begin marker", __func__);
222: goto out;
223: }
224: cp += m1len;
225: len -= m1len;
226: while (len) {
227: if (*cp != '\n' && *cp != '\r')
228: buffer_put_char(&encoded, *cp);
229: last = *cp;
230: len--;
231: cp++;
232: if (last == '\n') {
233: if (len >= m2len && !memcmp(cp, MARK_END, m2len)) {
234: buffer_put_char(&encoded, '\0');
235: break;
236: }
237: }
238: }
239: if (!len) {
240: debug("%s: no end marker", __func__);
241: goto out;
242: }
243: len = buffer_len(&encoded);
244: if ((cp = buffer_append_space(©, len)) == NULL) {
245: error("%s: buffer_append_space", __func__);
246: goto out;
247: }
248: if ((dlen = uudecode(buffer_ptr(&encoded), cp, len)) < 0) {
249: error("%s: uudecode failed", __func__);
250: goto out;
251: }
252: if ((u_int)dlen > len) {
253: error("%s: crazy uudecode length %d > %u", __func__, dlen, len);
254: goto out;
255: }
256: buffer_consume_end(©, len - dlen);
257: if (buffer_len(©) < sizeof(AUTH_MAGIC) ||
258: memcmp(buffer_ptr(©), AUTH_MAGIC, sizeof(AUTH_MAGIC))) {
259: error("%s: bad magic", __func__);
260: goto out;
261: }
262: buffer_consume(©, sizeof(AUTH_MAGIC));
263:
264: ciphername = buffer_get_cstring_ret(©, NULL);
265: if (ciphername == NULL ||
266: (c = cipher_by_name(ciphername)) == NULL) {
267: error("%s: unknown cipher name", __func__);
268: goto out;
269: }
270: if ((passphrase == NULL || !strlen(passphrase)) &&
271: strcmp(ciphername, "none") != 0) {
272: /* passphrase required */
273: goto out;
274: }
275: kdfname = buffer_get_cstring_ret(©, NULL);
276: if (kdfname == NULL ||
277: (!strcmp(kdfname, "none") && !strcmp(kdfname, "bcrypt"))) {
278: error("%s: unknown kdf name", __func__);
279: goto out;
280: }
281: if (!strcmp(kdfname, "none") && strcmp(ciphername, "none") != 0) {
282: error("%s: cipher %s requires kdf", __func__, ciphername);
283: goto out;
284: }
285: /* kdf options */
286: kdfp = buffer_get_string_ptr_ret(©, &klen);
287: if (kdfp == NULL) {
288: error("%s: kdf options not set", __func__);
289: goto out;
290: }
291: if (klen > 0) {
292: if ((cp = buffer_append_space(&kdf, klen)) == NULL) {
293: error("%s: kdf alloc failed", __func__);
294: goto out;
295: }
296: memcpy(cp, kdfp, klen);
297: }
298: /* number of keys */
299: if (buffer_get_int_ret(&nkeys, ©) < 0) {
300: error("%s: key counter missing", __func__);
301: goto out;
302: }
303: if (nkeys != 1) {
304: error("%s: only one key supported", __func__);
305: goto out;
306: }
307: /* pubkey */
308: if ((cp = buffer_get_string_ret(©, &len)) == NULL) {
309: error("%s: pubkey not found", __func__);
310: goto out;
311: }
312: free(cp); /* XXX check pubkey against decrypted private key */
313:
314: /* size of encrypted key blob */
315: len = buffer_get_int(©);
316: blocksize = cipher_blocksize(c);
317: authlen = cipher_authlen(c);
318: if (len < blocksize) {
319: error("%s: encrypted data too small", __func__);
320: goto out;
321: }
322: if (len % blocksize) {
323: error("%s: length not multiple of blocksize", __func__);
324: goto out;
325: }
326:
327: /* setup key */
328: keylen = cipher_keylen(c);
329: ivlen = cipher_ivlen(c);
330: key = xcalloc(1, keylen + ivlen);
331: if (!strcmp(kdfname, "bcrypt")) {
332: if ((salt = buffer_get_string_ret(&kdf, &slen)) == NULL) {
333: error("%s: salt not set", __func__);
334: goto out;
335: }
336: if (buffer_get_int_ret(&rounds, &kdf) < 0) {
337: error("%s: rounds not set", __func__);
338: goto out;
339: }
340: if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
341: key, keylen + ivlen, rounds) < 0) {
342: error("%s: bcrypt_pbkdf failed", __func__);
343: goto out;
344: }
345: }
346:
347: cp = buffer_append_space(&b, len);
348: cipher_init(&ctx, c, key, keylen, key + keylen, ivlen, 0);
349: ret = cipher_crypt(&ctx, 0, cp, buffer_ptr(©), len, 0, authlen);
350: cipher_cleanup(&ctx);
351: buffer_consume(©, len);
352:
353: /* fail silently on decryption errors */
354: if (ret != 0) {
355: debug("%s: decrypt failed", __func__);
356: goto out;
357: }
358:
359: if (buffer_len(©) != 0) {
360: error("%s: key blob has trailing data (len = %u)", __func__,
361: buffer_len(©));
362: goto out;
363: }
364:
365: /* check bytes */
366: if (buffer_get_int_ret(&check1, &b) < 0 ||
367: buffer_get_int_ret(&check2, &b) < 0) {
368: error("check bytes missing");
369: goto out;
370: }
371: if (check1 != check2) {
372: debug("%s: decrypt failed: 0x%08x != 0x%08x", __func__,
373: check1, check2);
374: goto out;
375: }
376:
377: k = key_private_deserialize(&b);
378:
379: /* comment */
380: comment = buffer_get_cstring_ret(&b, NULL);
381:
382: i = 0;
383: while (buffer_len(&b)) {
384: if (buffer_get_char_ret(&pad, &b) == -1 ||
385: pad != (++i & 0xff)) {
386: error("%s: bad padding", __func__);
387: key_free(k);
388: k = NULL;
389: goto out;
390: }
391: }
392:
393: if (k && commentp) {
394: *commentp = comment;
395: comment = NULL;
396: }
397:
398: /* XXX decode pubkey and check against private */
399: out:
400: free(ciphername);
401: free(kdfname);
402: free(salt);
403: free(comment);
404: if (key)
405: memset(key, 0, keylen + ivlen);
406: free(key);
407: buffer_free(&encoded);
408: buffer_free(©);
409: buffer_free(&kdf);
410: buffer_free(&b);
411: return k;
412: }
413:
1.10 markus 414: /*
1.86 djm 415: * Serialises the authentication (private) key to a blob, encrypting it with
416: * passphrase. The identification of the blob (lowest 64 bits of n) will
1.10 markus 417: * precede the key to provide identification of the key without needing a
418: * passphrase.
419: */
1.37 itojun 420: static int
1.86 djm 421: key_private_rsa1_to_blob(Key *key, Buffer *blob, const char *passphrase,
1.29 markus 422: const char *comment)
1.1 deraadt 423: {
1.8 markus 424: Buffer buffer, encrypted;
1.45 stevesk 425: u_char buf[100], *cp;
1.86 djm 426: int i, cipher_num;
1.20 markus 427: CipherContext ciphercontext;
1.96 djm 428: const Cipher *cipher;
1.57 avsm 429: u_int32_t rnd;
1.8 markus 430:
1.10 markus 431: /*
432: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
433: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
434: */
1.46 markus 435: cipher_num = (strcmp(passphrase, "") == 0) ?
436: SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
437: if ((cipher = cipher_by_number(cipher_num)) == NULL)
1.20 markus 438: fatal("save_private_key_rsa: bad cipher");
1.8 markus 439:
440: /* This buffer is used to built the secret part of the private key. */
441: buffer_init(&buffer);
442:
443: /* Put checkbytes for checking passphrase validity. */
1.57 avsm 444: rnd = arc4random();
445: buf[0] = rnd & 0xff;
446: buf[1] = (rnd >> 8) & 0xff;
1.8 markus 447: buf[2] = buf[0];
448: buf[3] = buf[1];
449: buffer_append(&buffer, buf, 4);
450:
1.10 markus 451: /*
452: * Store the private key (n and e will not be stored because they
453: * will be stored in plain text, and storing them also in encrypted
454: * format would just give known plaintext).
455: */
1.29 markus 456: buffer_put_bignum(&buffer, key->rsa->d);
457: buffer_put_bignum(&buffer, key->rsa->iqmp);
458: buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
459: buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
1.8 markus 460:
461: /* Pad the part to be encrypted until its size is a multiple of 8. */
462: while (buffer_len(&buffer) % 8 != 0)
463: buffer_put_char(&buffer, 0);
464:
465: /* This buffer will be used to contain the data in the file. */
466: buffer_init(&encrypted);
467:
468: /* First store keyfile id string. */
1.26 stevesk 469: for (i = 0; authfile_id_string[i]; i++)
470: buffer_put_char(&encrypted, authfile_id_string[i]);
1.8 markus 471: buffer_put_char(&encrypted, 0);
472:
473: /* Store cipher type. */
1.46 markus 474: buffer_put_char(&encrypted, cipher_num);
1.8 markus 475: buffer_put_int(&encrypted, 0); /* For future extension */
476:
477: /* Store public key. This will be in plain text. */
1.29 markus 478: buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
479: buffer_put_bignum(&encrypted, key->rsa->n);
480: buffer_put_bignum(&encrypted, key->rsa->e);
1.36 markus 481: buffer_put_cstring(&encrypted, comment);
1.8 markus 482:
483: /* Allocate space for the private part of the key in the buffer. */
1.42 stevesk 484: cp = buffer_append_space(&encrypted, buffer_len(&buffer));
1.8 markus 485:
1.46 markus 486: cipher_set_key_string(&ciphercontext, cipher, passphrase,
487: CIPHER_ENCRYPT);
1.99 markus 488: if (cipher_crypt(&ciphercontext, 0, cp,
489: buffer_ptr(&buffer), buffer_len(&buffer), 0, 0) != 0)
490: fatal("%s: cipher_crypt failed", __func__);
1.46 markus 491: cipher_cleanup(&ciphercontext);
1.20 markus 492: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.8 markus 493:
494: /* Destroy temporary data. */
495: memset(buf, 0, sizeof(buf));
496: buffer_free(&buffer);
497:
1.86 djm 498: buffer_append(blob, buffer_ptr(&encrypted), buffer_len(&encrypted));
1.8 markus 499: buffer_free(&encrypted);
1.86 djm 500:
1.8 markus 501: return 1;
1.1 deraadt 502: }
503:
1.86 djm 504: /* convert SSH v2 key in OpenSSL PEM format */
1.37 itojun 505: static int
1.86 djm 506: key_private_pem_to_blob(Key *key, Buffer *blob, const char *_passphrase,
1.29 markus 507: const char *comment)
1.15 markus 508: {
1.21 markus 509: int success = 0;
1.86 djm 510: int blen, len = strlen(_passphrase);
1.47 markus 511: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
1.77 djm 512: const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
1.86 djm 513: const u_char *bptr;
514: BIO *bio;
1.15 markus 515:
516: if (len > 0 && len <= 4) {
1.31 markus 517: error("passphrase too short: have %d bytes, need > 4", len);
1.15 markus 518: return 0;
519: }
1.86 djm 520: if ((bio = BIO_new(BIO_s_mem())) == NULL) {
521: error("%s: BIO_new failed", __func__);
1.15 markus 522: return 0;
523: }
1.21 markus 524: switch (key->type) {
1.30 markus 525: case KEY_DSA:
1.86 djm 526: success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
1.30 markus 527: cipher, passphrase, len, NULL, NULL);
528: break;
1.83 djm 529: case KEY_ECDSA:
1.86 djm 530: success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
1.83 djm 531: cipher, passphrase, len, NULL, NULL);
532: break;
1.30 markus 533: case KEY_RSA:
1.86 djm 534: success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
1.30 markus 535: cipher, passphrase, len, NULL, NULL);
536: break;
1.15 markus 537: }
1.86 djm 538: if (success) {
539: if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0)
540: success = 0;
541: else
542: buffer_append(blob, bptr, blen);
543: }
544: BIO_free(bio);
1.15 markus 545: return success;
546: }
547:
1.86 djm 548: /* Save a key blob to a file */
549: static int
550: key_save_private_blob(Buffer *keybuf, const char *filename)
551: {
552: int fd;
553:
554: if ((fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600)) < 0) {
555: error("open %s failed: %s.", filename, strerror(errno));
556: return 0;
557: }
558: if (atomicio(vwrite, fd, buffer_ptr(keybuf),
559: buffer_len(keybuf)) != buffer_len(keybuf)) {
560: error("write to key file %s failed: %s", filename,
561: strerror(errno));
562: close(fd);
563: unlink(filename);
564: return 0;
565: }
566: close(fd);
567: return 1;
568: }
569:
570: /* Serialise "key" to buffer "blob" */
571: static int
572: key_private_to_blob(Key *key, Buffer *blob, const char *passphrase,
1.99 markus 573: const char *comment, int force_new_format, const char *new_format_cipher,
574: int new_format_rounds)
1.15 markus 575: {
576: switch (key->type) {
1.21 markus 577: case KEY_RSA1:
1.86 djm 578: return key_private_rsa1_to_blob(key, blob, passphrase, comment);
1.15 markus 579: case KEY_DSA:
1.83 djm 580: case KEY_ECDSA:
1.21 markus 581: case KEY_RSA:
1.99 markus 582: if (force_new_format) {
583: return key_private_to_blob2(key, blob, passphrase,
584: comment, new_format_cipher, new_format_rounds);
585: }
1.86 djm 586: return key_private_pem_to_blob(key, blob, passphrase, comment);
1.100 ! markus 587: case KEY_ED25519:
! 588: return key_private_to_blob2(key, blob, passphrase,
! 589: comment, new_format_cipher, new_format_rounds);
1.15 markus 590: default:
1.86 djm 591: error("%s: cannot save key type %d", __func__, key->type);
592: return 0;
1.15 markus 593: }
1.86 djm 594: }
595:
596: int
597: key_save_private(Key *key, const char *filename, const char *passphrase,
1.99 markus 598: const char *comment, int force_new_format, const char *new_format_cipher,
599: int new_format_rounds)
1.86 djm 600: {
601: Buffer keyblob;
602: int success = 0;
603:
604: buffer_init(&keyblob);
1.99 markus 605: if (!key_private_to_blob(key, &keyblob, passphrase, comment,
606: force_new_format, new_format_cipher, new_format_rounds))
1.86 djm 607: goto out;
608: if (!key_save_private_blob(&keyblob, filename))
609: goto out;
610: success = 1;
611: out:
612: buffer_free(&keyblob);
613: return success;
1.15 markus 614: }
615:
1.10 markus 616: /*
1.86 djm 617: * Parse the public, unencrypted portion of a RSA1 key.
1.10 markus 618: */
1.37 itojun 619: static Key *
1.86 djm 620: key_parse_public_rsa1(Buffer *blob, char **commentp)
1.1 deraadt 621: {
1.29 markus 622: Key *pub;
1.92 markus 623: Buffer copy;
1.86 djm 624:
625: /* Check that it is at least big enough to contain the ID string. */
626: if (buffer_len(blob) < sizeof(authfile_id_string)) {
627: debug3("Truncated RSA1 identifier");
628: return NULL;
629: }
630:
631: /*
632: * Make sure it begins with the id string. Consume the id string
633: * from the buffer.
634: */
635: if (memcmp(buffer_ptr(blob), authfile_id_string,
636: sizeof(authfile_id_string)) != 0) {
637: debug3("Incorrect RSA1 identifier");
638: return NULL;
639: }
1.92 markus 640: buffer_init(©);
641: buffer_append(©, buffer_ptr(blob), buffer_len(blob));
642: buffer_consume(©, sizeof(authfile_id_string));
1.86 djm 643:
644: /* Skip cipher type and reserved data. */
1.92 markus 645: (void) buffer_get_char(©); /* cipher type */
646: (void) buffer_get_int(©); /* reserved */
1.86 djm 647:
648: /* Read the public key from the buffer. */
1.92 markus 649: (void) buffer_get_int(©);
1.86 djm 650: pub = key_new(KEY_RSA1);
1.92 markus 651: buffer_get_bignum(©, pub->rsa->n);
652: buffer_get_bignum(©, pub->rsa->e);
1.86 djm 653: if (commentp)
1.92 markus 654: *commentp = buffer_get_string(©, NULL);
1.86 djm 655: /* The encrypted private part is not parsed by this function. */
1.92 markus 656: buffer_free(©);
1.86 djm 657:
658: return pub;
659: }
660:
1.88 djm 661: /* Load a key from a fd into a buffer */
662: int
1.86 djm 663: key_load_file(int fd, const char *filename, Buffer *blob)
664: {
1.88 djm 665: u_char buf[1024];
1.86 djm 666: size_t len;
1.51 fgsch 667: struct stat st;
1.8 markus 668:
1.51 fgsch 669: if (fstat(fd, &st) < 0) {
1.86 djm 670: error("%s: fstat of key file %.200s%sfailed: %.100s", __func__,
671: filename == NULL ? "" : filename,
672: filename == NULL ? "" : " ",
673: strerror(errno));
674: return 0;
1.51 fgsch 675: }
1.88 djm 676: if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 &&
677: st.st_size > MAX_KEY_FILE_SIZE) {
678: toobig:
1.86 djm 679: error("%s: key file %.200s%stoo large", __func__,
680: filename == NULL ? "" : filename,
681: filename == NULL ? "" : " ");
682: return 0;
1.58 djm 683: }
1.93 markus 684: buffer_clear(blob);
1.88 djm 685: for (;;) {
686: if ((len = atomicio(read, fd, buf, sizeof(buf))) == 0) {
687: if (errno == EPIPE)
688: break;
689: debug("%s: read from key file %.200s%sfailed: %.100s",
690: __func__, filename == NULL ? "" : filename,
691: filename == NULL ? "" : " ", strerror(errno));
692: buffer_clear(blob);
693: bzero(buf, sizeof(buf));
694: return 0;
695: }
696: buffer_append(blob, buf, len);
697: if (buffer_len(blob) > MAX_KEY_FILE_SIZE) {
698: buffer_clear(blob);
699: bzero(buf, sizeof(buf));
700: goto toobig;
701: }
702: }
703: bzero(buf, sizeof(buf));
704: if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 &&
705: st.st_size != buffer_len(blob)) {
706: debug("%s: key file %.200s%schanged size while reading",
707: __func__, filename == NULL ? "" : filename,
708: filename == NULL ? "" : " ");
1.86 djm 709: buffer_clear(blob);
710: return 0;
1.8 markus 711: }
1.88 djm 712:
1.86 djm 713: return 1;
714: }
1.8 markus 715:
1.86 djm 716: /*
717: * Loads the public part of the ssh v1 key file. Returns NULL if an error was
718: * encountered (the file does not exist or is not readable), and the key
719: * otherwise.
720: */
721: static Key *
722: key_load_public_rsa1(int fd, const char *filename, char **commentp)
723: {
724: Buffer buffer;
725: Key *pub;
726:
727: buffer_init(&buffer);
728: if (!key_load_file(fd, filename, &buffer)) {
1.8 markus 729: buffer_free(&buffer);
1.29 markus 730: return NULL;
1.8 markus 731: }
732:
1.86 djm 733: pub = key_parse_public_rsa1(&buffer, commentp);
734: if (pub == NULL)
735: debug3("Could not load \"%s\" as a RSA1 public key", filename);
1.1 deraadt 736: buffer_free(&buffer);
1.29 markus 737: return pub;
1.1 deraadt 738: }
739:
1.29 markus 740: /* load public key from private-key file, works only for SSH v1 */
741: Key *
742: key_load_public_type(int type, const char *filename, char **commentp)
1.15 markus 743: {
1.29 markus 744: Key *pub;
745: int fd;
746:
747: if (type == KEY_RSA1) {
748: fd = open(filename, O_RDONLY);
749: if (fd < 0)
750: return NULL;
751: pub = key_load_public_rsa1(fd, filename, commentp);
752: close(fd);
753: return pub;
1.15 markus 754: }
1.29 markus 755: return NULL;
1.15 markus 756: }
757:
1.37 itojun 758: static Key *
1.86 djm 759: key_parse_private_rsa1(Buffer *blob, const char *passphrase, char **commentp)
1.1 deraadt 760: {
1.61 djm 761: int check1, check2, cipher_type;
1.86 djm 762: Buffer decrypted;
1.45 stevesk 763: u_char *cp;
1.20 markus 764: CipherContext ciphercontext;
1.96 djm 765: const Cipher *cipher;
1.29 markus 766: Key *prv = NULL;
1.92 markus 767: Buffer copy;
1.8 markus 768:
1.86 djm 769: /* Check that it is at least big enough to contain the ID string. */
770: if (buffer_len(blob) < sizeof(authfile_id_string)) {
771: debug3("Truncated RSA1 identifier");
1.51 fgsch 772: return NULL;
773: }
1.8 markus 774:
1.10 markus 775: /*
776: * Make sure it begins with the id string. Consume the id string
777: * from the buffer.
778: */
1.86 djm 779: if (memcmp(buffer_ptr(blob), authfile_id_string,
780: sizeof(authfile_id_string)) != 0) {
781: debug3("Incorrect RSA1 identifier");
782: return NULL;
783: }
1.92 markus 784: buffer_init(©);
785: buffer_append(©, buffer_ptr(blob), buffer_len(blob));
786: buffer_consume(©, sizeof(authfile_id_string));
1.28 deraadt 787:
1.8 markus 788: /* Read cipher type. */
1.92 markus 789: cipher_type = buffer_get_char(©);
790: (void) buffer_get_int(©); /* Reserved data. */
1.8 markus 791:
792: /* Read the public key from the buffer. */
1.92 markus 793: (void) buffer_get_int(©);
1.29 markus 794: prv = key_new_private(KEY_RSA1);
795:
1.92 markus 796: buffer_get_bignum(©, prv->rsa->n);
797: buffer_get_bignum(©, prv->rsa->e);
1.29 markus 798: if (commentp)
1.92 markus 799: *commentp = buffer_get_string(©, NULL);
1.8 markus 800: else
1.92 markus 801: (void)buffer_get_string_ptr(©, NULL);
1.8 markus 802:
803: /* Check that it is a supported cipher. */
1.20 markus 804: cipher = cipher_by_number(cipher_type);
805: if (cipher == NULL) {
1.86 djm 806: debug("Unsupported RSA1 cipher %d", cipher_type);
1.92 markus 807: buffer_free(©);
1.8 markus 808: goto fail;
809: }
810: /* Initialize space for decrypted data. */
811: buffer_init(&decrypted);
1.92 markus 812: cp = buffer_append_space(&decrypted, buffer_len(©));
1.8 markus 813:
814: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
1.46 markus 815: cipher_set_key_string(&ciphercontext, cipher, passphrase,
816: CIPHER_DECRYPT);
1.99 markus 817: if (cipher_crypt(&ciphercontext, 0, cp,
818: buffer_ptr(©), buffer_len(©), 0, 0) != 0)
819: fatal("%s: cipher_crypt failed", __func__);
1.46 markus 820: cipher_cleanup(&ciphercontext);
1.20 markus 821: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.92 markus 822: buffer_free(©);
1.1 deraadt 823:
1.8 markus 824: check1 = buffer_get_char(&decrypted);
825: check2 = buffer_get_char(&decrypted);
826: if (check1 != buffer_get_char(&decrypted) ||
827: check2 != buffer_get_char(&decrypted)) {
828: if (strcmp(passphrase, "") != 0)
1.86 djm 829: debug("Bad passphrase supplied for RSA1 key");
1.8 markus 830: /* Bad passphrase. */
831: buffer_free(&decrypted);
1.29 markus 832: goto fail;
1.8 markus 833: }
834: /* Read the rest of the private key. */
1.29 markus 835: buffer_get_bignum(&decrypted, prv->rsa->d);
836: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
837: /* in SSL and SSH v1 p and q are exchanged */
838: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
839: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 840:
1.29 markus 841: /* calculate p-1 and q-1 */
1.43 markus 842: rsa_generate_additional_parameters(prv->rsa);
1.8 markus 843:
844: buffer_free(&decrypted);
1.52 markus 845:
846: /* enable blinding */
847: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
1.86 djm 848: error("%s: RSA_blinding_on failed", __func__);
1.52 markus 849: goto fail;
850: }
1.29 markus 851: return prv;
852:
853: fail:
1.97 djm 854: if (commentp != NULL)
855: free(*commentp);
1.29 markus 856: key_free(prv);
857: return NULL;
1.15 markus 858: }
859:
1.86 djm 860: static Key *
861: key_parse_private_pem(Buffer *blob, int type, const char *passphrase,
1.29 markus 862: char **commentp)
1.15 markus 863: {
1.21 markus 864: EVP_PKEY *pk = NULL;
1.29 markus 865: Key *prv = NULL;
1.21 markus 866: char *name = "<no key>";
1.86 djm 867: BIO *bio;
1.15 markus 868:
1.86 djm 869: if ((bio = BIO_new_mem_buf(buffer_ptr(blob),
870: buffer_len(blob))) == NULL) {
871: error("%s: BIO_new_mem_buf failed", __func__);
1.29 markus 872: return NULL;
1.15 markus 873: }
1.86 djm 874:
875: pk = PEM_read_bio_PrivateKey(bio, NULL, NULL, (char *)passphrase);
876: BIO_free(bio);
1.21 markus 877: if (pk == NULL) {
1.86 djm 878: debug("%s: PEM_read_PrivateKey failed", __func__);
1.21 markus 879: (void)ERR_get_error();
1.29 markus 880: } else if (pk->type == EVP_PKEY_RSA &&
1.41 deraadt 881: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 882: prv = key_new(KEY_UNSPEC);
883: prv->rsa = EVP_PKEY_get1_RSA(pk);
884: prv->type = KEY_RSA;
885: name = "rsa w/o comment";
1.21 markus 886: #ifdef DEBUG_PK
1.29 markus 887: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 888: #endif
1.52 markus 889: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
1.86 djm 890: error("%s: RSA_blinding_on failed", __func__);
1.52 markus 891: key_free(prv);
892: prv = NULL;
893: }
1.29 markus 894: } else if (pk->type == EVP_PKEY_DSA &&
1.41 deraadt 895: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 896: prv = key_new(KEY_UNSPEC);
897: prv->dsa = EVP_PKEY_get1_DSA(pk);
898: prv->type = KEY_DSA;
899: name = "dsa w/o comment";
1.21 markus 900: #ifdef DEBUG_PK
1.29 markus 901: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 902: #endif
1.83 djm 903: } else if (pk->type == EVP_PKEY_EC &&
904: (type == KEY_UNSPEC||type==KEY_ECDSA)) {
905: prv = key_new(KEY_UNSPEC);
906: prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
907: prv->type = KEY_ECDSA;
1.85 djm 908: if ((prv->ecdsa_nid = key_ecdsa_key_to_nid(prv->ecdsa)) == -1 ||
909: key_curve_nid_to_name(prv->ecdsa_nid) == NULL ||
910: key_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
1.83 djm 911: EC_KEY_get0_public_key(prv->ecdsa)) != 0 ||
912: key_ec_validate_private(prv->ecdsa) != 0) {
913: error("%s: bad ECDSA key", __func__);
914: key_free(prv);
915: prv = NULL;
916: }
1.84 djm 917: name = "ecdsa w/o comment";
1.83 djm 918: #ifdef DEBUG_PK
1.85 djm 919: if (prv != NULL && prv->ecdsa != NULL)
1.83 djm 920: key_dump_ec_key(prv->ecdsa);
921: #endif
1.15 markus 922: } else {
1.86 djm 923: error("%s: PEM_read_PrivateKey: mismatch or "
924: "unknown EVP_PKEY save_type %d", __func__, pk->save_type);
1.15 markus 925: }
1.21 markus 926: if (pk != NULL)
927: EVP_PKEY_free(pk);
1.29 markus 928: if (prv != NULL && commentp)
929: *commentp = xstrdup(name);
930: debug("read PEM private key done: type %s",
931: prv ? key_type(prv) : "<unknown>");
932: return prv;
1.15 markus 933: }
934:
1.86 djm 935: Key *
936: key_load_private_pem(int fd, int type, const char *passphrase,
937: char **commentp)
938: {
939: Buffer buffer;
940: Key *prv;
941:
942: buffer_init(&buffer);
943: if (!key_load_file(fd, NULL, &buffer)) {
944: buffer_free(&buffer);
945: return NULL;
946: }
947: prv = key_parse_private_pem(&buffer, type, passphrase, commentp);
948: buffer_free(&buffer);
949: return prv;
950: }
951:
1.63 dtucker 952: int
1.29 markus 953: key_perm_ok(int fd, const char *filename)
1.15 markus 954: {
955: struct stat st;
956:
1.38 markus 957: if (fstat(fd, &st) < 0)
958: return 0;
959: /*
960: * if a key owned by the user is accessed, then we check the
961: * permissions of the file. if the key owned by a different user,
962: * then we don't care.
963: */
964: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 965: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
966: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
967: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.38 markus 968: error("Permissions 0%3.3o for '%s' are too open.",
1.54 djm 969: (u_int)st.st_mode & 0777, filename);
1.15 markus 970: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 971: error("This private key will be ignored.");
1.15 markus 972: return 0;
973: }
1.29 markus 974: return 1;
975: }
976:
1.86 djm 977: static Key *
978: key_parse_private_type(Buffer *blob, int type, const char *passphrase,
979: char **commentp)
980: {
1.99 markus 981: Key *k;
982:
1.86 djm 983: switch (type) {
984: case KEY_RSA1:
985: return key_parse_private_rsa1(blob, passphrase, commentp);
986: case KEY_DSA:
987: case KEY_ECDSA:
988: case KEY_RSA:
1.100 ! markus 989: return key_parse_private_pem(blob, type, passphrase, commentp);
! 990: case KEY_ED25519:
! 991: return key_parse_private2(blob, type, passphrase, commentp);
1.86 djm 992: case KEY_UNSPEC:
1.99 markus 993: if ((k = key_parse_private2(blob, type, passphrase, commentp)))
994: return k;
1.86 djm 995: return key_parse_private_pem(blob, type, passphrase, commentp);
996: default:
1.90 djm 997: error("%s: cannot parse key type %d", __func__, type);
1.86 djm 998: break;
999: }
1000: return NULL;
1001: }
1002:
1.29 markus 1003: Key *
1004: key_load_private_type(int type, const char *filename, const char *passphrase,
1.67 dtucker 1005: char **commentp, int *perm_ok)
1.29 markus 1006: {
1007: int fd;
1.86 djm 1008: Key *ret;
1009: Buffer buffer;
1.29 markus 1010:
1011: fd = open(filename, O_RDONLY);
1.78 dtucker 1012: if (fd < 0) {
1013: debug("could not open key file '%s': %s", filename,
1014: strerror(errno));
1015: if (perm_ok != NULL)
1016: *perm_ok = 0;
1.79 dtucker 1017: return NULL;
1.78 dtucker 1018: }
1.29 markus 1019: if (!key_perm_ok(fd, filename)) {
1.67 dtucker 1020: if (perm_ok != NULL)
1021: *perm_ok = 0;
1.31 markus 1022: error("bad permissions: ignore key: %s", filename);
1.29 markus 1023: close(fd);
1024: return NULL;
1025: }
1.67 dtucker 1026: if (perm_ok != NULL)
1027: *perm_ok = 1;
1.86 djm 1028:
1029: buffer_init(&buffer);
1030: if (!key_load_file(fd, filename, &buffer)) {
1031: buffer_free(&buffer);
1.28 deraadt 1032: close(fd);
1.86 djm 1033: return NULL;
1.15 markus 1034: }
1.86 djm 1035: close(fd);
1036: ret = key_parse_private_type(&buffer, type, passphrase, commentp);
1037: buffer_free(&buffer);
1038: return ret;
1.29 markus 1039: }
1040:
1041: Key *
1.88 djm 1042: key_parse_private(Buffer *buffer, const char *filename,
1043: const char *passphrase, char **commentp)
1044: {
1045: Key *pub, *prv;
1046:
1047: /* it's a SSH v1 key if the public key part is readable */
1.92 markus 1048: pub = key_parse_public_rsa1(buffer, commentp);
1.88 djm 1049: if (pub == NULL) {
1050: prv = key_parse_private_type(buffer, KEY_UNSPEC,
1051: passphrase, NULL);
1052: /* use the filename as a comment for PEM */
1053: if (commentp && prv)
1054: *commentp = xstrdup(filename);
1055: } else {
1056: key_free(pub);
1057: /* key_parse_public_rsa1() has already loaded the comment */
1058: prv = key_parse_private_type(buffer, KEY_RSA1, passphrase,
1059: NULL);
1060: }
1061: return prv;
1062: }
1063:
1064: Key *
1.29 markus 1065: key_load_private(const char *filename, const char *passphrase,
1066: char **commentp)
1067: {
1.88 djm 1068: Key *prv;
1069: Buffer buffer;
1.29 markus 1070: int fd;
1071:
1072: fd = open(filename, O_RDONLY);
1.78 dtucker 1073: if (fd < 0) {
1074: debug("could not open key file '%s': %s", filename,
1075: strerror(errno));
1.29 markus 1076: return NULL;
1.78 dtucker 1077: }
1.29 markus 1078: if (!key_perm_ok(fd, filename)) {
1.31 markus 1079: error("bad permissions: ignore key: %s", filename);
1.29 markus 1080: close(fd);
1081: return NULL;
1082: }
1.86 djm 1083:
1084: buffer_init(&buffer);
1085: if (!key_load_file(fd, filename, &buffer)) {
1086: buffer_free(&buffer);
1087: close(fd);
1088: return NULL;
1089: }
1090: close(fd);
1091:
1.88 djm 1092: prv = key_parse_private(&buffer, filename, passphrase, commentp);
1.86 djm 1093: buffer_free(&buffer);
1.34 markus 1094: return prv;
1.18 markus 1095: }
1096:
1.37 itojun 1097: static int
1.29 markus 1098: key_try_load_public(Key *k, const char *filename, char **commentp)
1.18 markus 1099: {
1100: FILE *f;
1.59 dtucker 1101: char line[SSH_MAX_PUBKEY_BYTES];
1.18 markus 1102: char *cp;
1.60 dtucker 1103: u_long linenum = 0;
1.18 markus 1104:
1105: f = fopen(filename, "r");
1106: if (f != NULL) {
1.59 dtucker 1107: while (read_keyfile_line(f, filename, line, sizeof(line),
1108: &linenum) != -1) {
1.18 markus 1109: cp = line;
1.40 deraadt 1110: switch (*cp) {
1.18 markus 1111: case '#':
1112: case '\n':
1113: case '\0':
1114: continue;
1115: }
1.89 djm 1116: /* Abort loading if this looks like a private key */
1117: if (strncmp(cp, "-----BEGIN", 10) == 0)
1118: break;
1.18 markus 1119: /* Skip leading whitespace. */
1120: for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
1121: ;
1122: if (*cp) {
1.21 markus 1123: if (key_read(k, &cp) == 1) {
1.91 djm 1124: cp[strcspn(cp, "\r\n")] = '\0';
1125: if (commentp) {
1126: *commentp = xstrdup(*cp ?
1127: cp : filename);
1128: }
1.18 markus 1129: fclose(f);
1130: return 1;
1131: }
1132: }
1133: }
1134: fclose(f);
1135: }
1136: return 0;
1137: }
1138:
1.29 markus 1139: /* load public key from ssh v1 private or any pubkey file */
1140: Key *
1141: key_load_public(const char *filename, char **commentp)
1.18 markus 1142: {
1.29 markus 1143: Key *pub;
1144: char file[MAXPATHLEN];
1.18 markus 1145:
1.53 markus 1146: /* try rsa1 private key */
1.29 markus 1147: pub = key_load_public_type(KEY_RSA1, filename, commentp);
1148: if (pub != NULL)
1149: return pub;
1.53 markus 1150:
1151: /* try rsa1 public key */
1152: pub = key_new(KEY_RSA1);
1153: if (key_try_load_public(pub, filename, commentp) == 1)
1154: return pub;
1155: key_free(pub);
1156:
1157: /* try ssh2 public key */
1.29 markus 1158: pub = key_new(KEY_UNSPEC);
1159: if (key_try_load_public(pub, filename, commentp) == 1)
1160: return pub;
1161: if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
1162: (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
1163: (key_try_load_public(pub, file, commentp) == 1))
1164: return pub;
1.81 djm 1165: key_free(pub);
1166: return NULL;
1167: }
1168:
1169: /* Load the certificate associated with the named private key */
1170: Key *
1171: key_load_cert(const char *filename)
1172: {
1173: Key *pub;
1.82 djm 1174: char *file;
1.81 djm 1175:
1176: pub = key_new(KEY_UNSPEC);
1.82 djm 1177: xasprintf(&file, "%s-cert.pub", filename);
1178: if (key_try_load_public(pub, file, NULL) == 1) {
1.97 djm 1179: free(file);
1.81 djm 1180: return pub;
1.82 djm 1181: }
1.97 djm 1182: free(file);
1.81 djm 1183: key_free(pub);
1184: return NULL;
1185: }
1186:
1187: /* Load private key and certificate */
1188: Key *
1189: key_load_private_cert(int type, const char *filename, const char *passphrase,
1190: int *perm_ok)
1191: {
1192: Key *key, *pub;
1193:
1194: switch (type) {
1195: case KEY_RSA:
1196: case KEY_DSA:
1.83 djm 1197: case KEY_ECDSA:
1.81 djm 1198: break;
1199: default:
1200: error("%s: unsupported key type", __func__);
1201: return NULL;
1202: }
1203:
1204: if ((key = key_load_private_type(type, filename,
1205: passphrase, NULL, perm_ok)) == NULL)
1206: return NULL;
1207:
1208: if ((pub = key_load_cert(filename)) == NULL) {
1209: key_free(key);
1210: return NULL;
1211: }
1212:
1213: /* Make sure the private key matches the certificate */
1214: if (key_equal_public(key, pub) == 0) {
1215: error("%s: certificate does not match private key %s",
1216: __func__, filename);
1217: } else if (key_to_certified(key, key_cert_is_legacy(pub)) != 0) {
1218: error("%s: key_to_certified failed", __func__);
1219: } else {
1220: key_cert_copy(pub, key);
1221: key_free(pub);
1222: return key;
1223: }
1224:
1225: key_free(key);
1.29 markus 1226: key_free(pub);
1227: return NULL;
1.1 deraadt 1228: }
1.80 djm 1229:
1230: /*
1231: * Returns 1 if the specified "key" is listed in the file "filename",
1232: * 0 if the key is not listed or -1 on error.
1233: * If strict_type is set then the key type must match exactly,
1234: * otherwise a comparison that ignores certficiate data is performed.
1235: */
1236: int
1237: key_in_file(Key *key, const char *filename, int strict_type)
1238: {
1239: FILE *f;
1240: char line[SSH_MAX_PUBKEY_BYTES];
1241: char *cp;
1242: u_long linenum = 0;
1243: int ret = 0;
1244: Key *pub;
1245: int (*key_compare)(const Key *, const Key *) = strict_type ?
1246: key_equal : key_equal_public;
1247:
1248: if ((f = fopen(filename, "r")) == NULL) {
1249: if (errno == ENOENT) {
1250: debug("%s: keyfile \"%s\" missing", __func__, filename);
1251: return 0;
1252: } else {
1253: error("%s: could not open keyfile \"%s\": %s", __func__,
1254: filename, strerror(errno));
1255: return -1;
1256: }
1257: }
1258:
1259: while (read_keyfile_line(f, filename, line, sizeof(line),
1260: &linenum) != -1) {
1261: cp = line;
1262:
1263: /* Skip leading whitespace. */
1264: for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
1265: ;
1266:
1267: /* Skip comments and empty lines */
1268: switch (*cp) {
1269: case '#':
1270: case '\n':
1271: case '\0':
1272: continue;
1273: }
1274:
1275: pub = key_new(KEY_UNSPEC);
1276: if (key_read(pub, &cp) != 1) {
1277: key_free(pub);
1278: continue;
1279: }
1280: if (key_compare(key, pub)) {
1281: ret = 1;
1282: key_free(pub);
1283: break;
1284: }
1285: key_free(pub);
1286: }
1287: fclose(f);
1288: return ret;
1289: }
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