blob: e02b301fdb1b92f986380dde42103775389f5050 [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11003 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * This file contains functions for reading and writing identity files, and
6 * for reading the passphrase from the user.
Damien Miller4af51302000-04-16 11:18:38 +10007 *
Damien Millere4340be2000-09-16 13:29:08 +11008 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
13 *
14 *
15 * Copyright (c) 2000 Markus Friedl. All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110036 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100037
38#include "includes.h"
Ben Lindstromc1116602001-03-29 00:28:37 +000039RCSID("$OpenBSD: authfile.c,v 1.30 2001/03/26 23:12:42 markus Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100040
Damien Miller0bc1bd82000-11-13 22:57:25 +110041#include <openssl/err.h>
Damien Millereba71ba2000-04-29 23:57:08 +100042#include <openssl/evp.h>
Ben Lindstrom226cfa02001-01-22 05:34:40 +000043#include <openssl/pem.h>
Damien Millereba71ba2000-04-29 23:57:08 +100044
Ben Lindstrom226cfa02001-01-22 05:34:40 +000045#include "cipher.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100046#include "xmalloc.h"
47#include "buffer.h"
48#include "bufaux.h"
Damien Millereba71ba2000-04-29 23:57:08 +100049#include "key.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000050#include "ssh.h"
51#include "log.h"
Ben Lindstrom31ca54a2001-02-09 02:11:24 +000052#include "authfile.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100053
Ben Lindstromd0fca422001-03-26 13:44:06 +000054/* Version identification string for SSH v1 identity files. */
Ben Lindstrom1170d712001-01-29 07:51:26 +000055static const char authfile_id_string[] =
56 "SSH PRIVATE KEY FILE FORMAT 1.1\n";
Damien Millerd4a8b7e1999-10-27 13:42:43 +100057
Damien Miller5428f641999-11-25 11:54:57 +110058/*
59 * Saves the authentication (private) key in a file, encrypting it with
60 * passphrase. The identification of the file (lowest 64 bits of n) will
61 * precede the key to provide identification of the key without needing a
62 * passphrase.
63 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100064
65int
Ben Lindstromd0fca422001-03-26 13:44:06 +000066key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
67 const char *comment)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100068{
Damien Miller95def091999-11-25 00:26:21 +110069 Buffer buffer, encrypted;
70 char buf[100], *cp;
Damien Miller037a0dc1999-12-07 15:38:31 +110071 int fd, i;
Damien Miller874d77b2000-10-14 16:23:11 +110072 CipherContext ciphercontext;
73 Cipher *cipher;
Damien Miller95def091999-11-25 00:26:21 +110074 u_int32_t rand;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100075
Damien Miller5428f641999-11-25 11:54:57 +110076 /*
77 * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
78 * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
79 */
Damien Miller95def091999-11-25 00:26:21 +110080 if (strcmp(passphrase, "") == 0)
Damien Miller874d77b2000-10-14 16:23:11 +110081 cipher = cipher_by_number(SSH_CIPHER_NONE);
Damien Miller95def091999-11-25 00:26:21 +110082 else
Damien Miller874d77b2000-10-14 16:23:11 +110083 cipher = cipher_by_number(SSH_AUTHFILE_CIPHER);
84 if (cipher == NULL)
85 fatal("save_private_key_rsa: bad cipher");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100086
Damien Miller95def091999-11-25 00:26:21 +110087 /* This buffer is used to built the secret part of the private key. */
88 buffer_init(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100089
Damien Miller95def091999-11-25 00:26:21 +110090 /* Put checkbytes for checking passphrase validity. */
91 rand = arc4random();
92 buf[0] = rand & 0xff;
93 buf[1] = (rand >> 8) & 0xff;
94 buf[2] = buf[0];
95 buf[3] = buf[1];
96 buffer_append(&buffer, buf, 4);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100097
Damien Miller5428f641999-11-25 11:54:57 +110098 /*
99 * Store the private key (n and e will not be stored because they
100 * will be stored in plain text, and storing them also in encrypted
101 * format would just give known plaintext).
102 */
Ben Lindstromd0fca422001-03-26 13:44:06 +0000103 buffer_put_bignum(&buffer, key->rsa->d);
104 buffer_put_bignum(&buffer, key->rsa->iqmp);
105 buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
106 buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000107
Damien Miller95def091999-11-25 00:26:21 +1100108 /* Pad the part to be encrypted until its size is a multiple of 8. */
109 while (buffer_len(&buffer) % 8 != 0)
110 buffer_put_char(&buffer, 0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000111
Damien Miller95def091999-11-25 00:26:21 +1100112 /* This buffer will be used to contain the data in the file. */
113 buffer_init(&encrypted);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000114
Damien Miller95def091999-11-25 00:26:21 +1100115 /* First store keyfile id string. */
Ben Lindstrom1170d712001-01-29 07:51:26 +0000116 for (i = 0; authfile_id_string[i]; i++)
117 buffer_put_char(&encrypted, authfile_id_string[i]);
Damien Miller95def091999-11-25 00:26:21 +1100118 buffer_put_char(&encrypted, 0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000119
Damien Miller95def091999-11-25 00:26:21 +1100120 /* Store cipher type. */
Damien Miller874d77b2000-10-14 16:23:11 +1100121 buffer_put_char(&encrypted, cipher->number);
Damien Miller95def091999-11-25 00:26:21 +1100122 buffer_put_int(&encrypted, 0); /* For future extension */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000123
Damien Miller95def091999-11-25 00:26:21 +1100124 /* Store public key. This will be in plain text. */
Ben Lindstromd0fca422001-03-26 13:44:06 +0000125 buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
126 buffer_put_bignum(&encrypted, key->rsa->n);
127 buffer_put_bignum(&encrypted, key->rsa->e);
Damien Miller95def091999-11-25 00:26:21 +1100128 buffer_put_string(&encrypted, comment, strlen(comment));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000129
Damien Miller95def091999-11-25 00:26:21 +1100130 /* Allocate space for the private part of the key in the buffer. */
131 buffer_append_space(&encrypted, &cp, buffer_len(&buffer));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000132
Damien Miller874d77b2000-10-14 16:23:11 +1100133 cipher_set_key_string(&ciphercontext, cipher, passphrase);
Ben Lindstrom46c16222000-12-22 01:43:59 +0000134 cipher_encrypt(&ciphercontext, (u_char *) cp,
135 (u_char *) buffer_ptr(&buffer), buffer_len(&buffer));
Damien Miller874d77b2000-10-14 16:23:11 +1100136 memset(&ciphercontext, 0, sizeof(ciphercontext));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000137
Damien Miller95def091999-11-25 00:26:21 +1100138 /* Destroy temporary data. */
139 memset(buf, 0, sizeof(buf));
140 buffer_free(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000141
Damien Miller037a0dc1999-12-07 15:38:31 +1100142 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
143 if (fd < 0)
Damien Miller95def091999-11-25 00:26:21 +1100144 return 0;
Damien Miller037a0dc1999-12-07 15:38:31 +1100145 if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
Damien Miller95def091999-11-25 00:26:21 +1100146 buffer_len(&encrypted)) {
147 debug("Write to key file %.200s failed: %.100s", filename,
148 strerror(errno));
149 buffer_free(&encrypted);
Damien Miller037a0dc1999-12-07 15:38:31 +1100150 close(fd);
Damien Miller78315eb2000-09-29 23:01:36 +1100151 unlink(filename);
Damien Miller95def091999-11-25 00:26:21 +1100152 return 0;
153 }
Damien Miller037a0dc1999-12-07 15:38:31 +1100154 close(fd);
Damien Miller95def091999-11-25 00:26:21 +1100155 buffer_free(&encrypted);
156 return 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000157}
158
Ben Lindstromd0fca422001-03-26 13:44:06 +0000159/* save SSH v2 key in OpenSSL PEM format */
Damien Millereba71ba2000-04-29 23:57:08 +1000160int
Ben Lindstromd0fca422001-03-26 13:44:06 +0000161key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
162 const char *comment)
Damien Millereba71ba2000-04-29 23:57:08 +1000163{
164 FILE *fp;
165 int fd;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100166 int success = 0;
167 int len = strlen(_passphrase);
168 char *passphrase = (len > 0) ? (char *)_passphrase : NULL;
169 EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
Damien Millereba71ba2000-04-29 23:57:08 +1000170
171 if (len > 0 && len <= 4) {
172 error("passphrase too short: %d bytes", len);
173 errno = 0;
174 return 0;
175 }
176 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
177 if (fd < 0) {
178 debug("open %s failed", filename);
179 return 0;
180 }
181 fp = fdopen(fd, "w");
182 if (fp == NULL ) {
183 debug("fdopen %s failed", filename);
184 close(fd);
185 return 0;
186 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100187 switch (key->type) {
Ben Lindstromc1116602001-03-29 00:28:37 +0000188 case KEY_DSA:
189 success = PEM_write_DSAPrivateKey(fp, key->dsa,
190 cipher, passphrase, len, NULL, NULL);
191 break;
192 case KEY_RSA:
193 success = PEM_write_RSAPrivateKey(fp, key->rsa,
194 cipher, passphrase, len, NULL, NULL);
195 break;
Damien Millereba71ba2000-04-29 23:57:08 +1000196 }
197 fclose(fp);
198 return success;
199}
200
201int
Ben Lindstromd0fca422001-03-26 13:44:06 +0000202key_save_private(Key *key, const char *filename, const char *passphrase,
Damien Millereba71ba2000-04-29 23:57:08 +1000203 const char *comment)
204{
205 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100206 case KEY_RSA1:
Ben Lindstromd0fca422001-03-26 13:44:06 +0000207 return key_save_private_rsa1(key, filename, passphrase,
208 comment);
Damien Millereba71ba2000-04-29 23:57:08 +1000209 break;
210 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100211 case KEY_RSA:
Ben Lindstromd0fca422001-03-26 13:44:06 +0000212 return key_save_private_pem(key, filename, passphrase,
213 comment);
Damien Millereba71ba2000-04-29 23:57:08 +1000214 break;
215 default:
216 break;
217 }
218 return 0;
219}
220
Damien Miller5428f641999-11-25 11:54:57 +1100221/*
Ben Lindstromd0fca422001-03-26 13:44:06 +0000222 * Loads the public part of the ssh v1 key file. Returns NULL if an error was
223 * encountered (the file does not exist or is not readable), and the key
Damien Miller5428f641999-11-25 11:54:57 +1100224 * otherwise.
225 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000226
Ben Lindstromd0fca422001-03-26 13:44:06 +0000227Key *
228key_load_public_rsa1(int fd, const char *filename, char **commentp)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000229{
Damien Miller95def091999-11-25 00:26:21 +1100230 Buffer buffer;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000231 Key *pub;
Damien Miller95def091999-11-25 00:26:21 +1100232 char *cp;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000233 int i;
234 off_t len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000235
Damien Miller037a0dc1999-12-07 15:38:31 +1100236 len = lseek(fd, (off_t) 0, SEEK_END);
237 lseek(fd, (off_t) 0, SEEK_SET);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000238
Damien Miller95def091999-11-25 00:26:21 +1100239 buffer_init(&buffer);
240 buffer_append_space(&buffer, &cp, len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000241
Damien Miller037a0dc1999-12-07 15:38:31 +1100242 if (read(fd, cp, (size_t) len) != (size_t) len) {
Damien Miller95def091999-11-25 00:26:21 +1100243 debug("Read from key file %.200s failed: %.100s", filename,
Damien Millereba71ba2000-04-29 23:57:08 +1000244 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100245 buffer_free(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000246 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100247 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000248
Ben Lindstrom1170d712001-01-29 07:51:26 +0000249 /* Check that it is at least big enough to contain the ID string. */
250 if (len < sizeof(authfile_id_string)) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100251 debug3("Bad RSA1 key file %.200s.", filename);
Damien Miller95def091999-11-25 00:26:21 +1100252 buffer_free(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000253 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100254 }
Damien Miller5428f641999-11-25 11:54:57 +1100255 /*
256 * Make sure it begins with the id string. Consume the id string
257 * from the buffer.
258 */
Ben Lindstrom1170d712001-01-29 07:51:26 +0000259 for (i = 0; i < sizeof(authfile_id_string); i++)
260 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100261 debug3("Bad RSA1 key file %.200s.", filename);
Damien Miller95def091999-11-25 00:26:21 +1100262 buffer_free(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000263 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100264 }
265 /* Skip cipher type and reserved data. */
266 (void) buffer_get_char(&buffer); /* cipher type */
267 (void) buffer_get_int(&buffer); /* reserved */
268
269 /* Read the public key from the buffer. */
270 buffer_get_int(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000271 pub = key_new(KEY_RSA1);
272 buffer_get_bignum(&buffer, pub->rsa->n);
273 buffer_get_bignum(&buffer, pub->rsa->e);
274 if (commentp)
275 *commentp = buffer_get_string(&buffer, NULL);
Damien Miller95def091999-11-25 00:26:21 +1100276 /* The encrypted private part is not parsed by this function. */
277
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000278 buffer_free(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000279 return pub;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000280}
281
Ben Lindstromd0fca422001-03-26 13:44:06 +0000282/* load public key from private-key file, works only for SSH v1 */
283Key *
284key_load_public_type(int type, const char *filename, char **commentp)
Damien Millereba71ba2000-04-29 23:57:08 +1000285{
Ben Lindstromd0fca422001-03-26 13:44:06 +0000286 Key *pub;
287 int fd;
288
289 if (type == KEY_RSA1) {
290 fd = open(filename, O_RDONLY);
291 if (fd < 0)
292 return NULL;
293 pub = key_load_public_rsa1(fd, filename, commentp);
294 close(fd);
295 return pub;
Damien Millereba71ba2000-04-29 23:57:08 +1000296 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000297 return NULL;
Damien Millereba71ba2000-04-29 23:57:08 +1000298}
299
Damien Miller5428f641999-11-25 11:54:57 +1100300/*
301 * Loads the private key from the file. Returns 0 if an error is encountered
302 * (file does not exist or is not readable, or passphrase is bad). This
303 * initializes the private key.
304 * Assumes we are called under uid of the owner of the file.
305 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000306
Ben Lindstromd0fca422001-03-26 13:44:06 +0000307Key *
308key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
309 char **commentp)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000310{
Damien Millereba71ba2000-04-29 23:57:08 +1000311 int i, check1, check2, cipher_type;
Damien Miller95def091999-11-25 00:26:21 +1100312 off_t len;
313 Buffer buffer, decrypted;
314 char *cp;
Damien Miller874d77b2000-10-14 16:23:11 +1100315 CipherContext ciphercontext;
316 Cipher *cipher;
Damien Miller95def091999-11-25 00:26:21 +1100317 BN_CTX *ctx;
318 BIGNUM *aux;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000319 Key *prv = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000320
Damien Miller037a0dc1999-12-07 15:38:31 +1100321 len = lseek(fd, (off_t) 0, SEEK_END);
322 lseek(fd, (off_t) 0, SEEK_SET);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000323
Damien Miller95def091999-11-25 00:26:21 +1100324 buffer_init(&buffer);
325 buffer_append_space(&buffer, &cp, len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000326
Damien Miller037a0dc1999-12-07 15:38:31 +1100327 if (read(fd, cp, (size_t) len) != (size_t) len) {
Damien Miller95def091999-11-25 00:26:21 +1100328 debug("Read from key file %.200s failed: %.100s", filename,
Damien Miller0bc1bd82000-11-13 22:57:25 +1100329 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100330 buffer_free(&buffer);
Damien Miller037a0dc1999-12-07 15:38:31 +1100331 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000332 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100333 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000334
Ben Lindstrom1170d712001-01-29 07:51:26 +0000335 /* Check that it is at least big enough to contain the ID string. */
336 if (len < sizeof(authfile_id_string)) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100337 debug3("Bad RSA1 key file %.200s.", filename);
Damien Miller95def091999-11-25 00:26:21 +1100338 buffer_free(&buffer);
Ben Lindstromb257cca2001-03-05 04:59:27 +0000339 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000340 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100341 }
Damien Miller5428f641999-11-25 11:54:57 +1100342 /*
343 * Make sure it begins with the id string. Consume the id string
344 * from the buffer.
345 */
Ben Lindstrom1170d712001-01-29 07:51:26 +0000346 for (i = 0; i < sizeof(authfile_id_string); i++)
347 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100348 debug3("Bad RSA1 key file %.200s.", filename);
Damien Miller95def091999-11-25 00:26:21 +1100349 buffer_free(&buffer);
Ben Lindstromb257cca2001-03-05 04:59:27 +0000350 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000351 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100352 }
Ben Lindstromb257cca2001-03-05 04:59:27 +0000353
Damien Miller95def091999-11-25 00:26:21 +1100354 /* Read cipher type. */
355 cipher_type = buffer_get_char(&buffer);
356 (void) buffer_get_int(&buffer); /* Reserved data. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000357
Damien Miller95def091999-11-25 00:26:21 +1100358 /* Read the public key from the buffer. */
359 buffer_get_int(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000360 prv = key_new_private(KEY_RSA1);
361
362 buffer_get_bignum(&buffer, prv->rsa->n);
363 buffer_get_bignum(&buffer, prv->rsa->e);
364 if (commentp)
365 *commentp = buffer_get_string(&buffer, NULL);
Damien Miller95def091999-11-25 00:26:21 +1100366 else
367 xfree(buffer_get_string(&buffer, NULL));
368
369 /* Check that it is a supported cipher. */
Damien Miller874d77b2000-10-14 16:23:11 +1100370 cipher = cipher_by_number(cipher_type);
371 if (cipher == NULL) {
372 debug("Unsupported cipher %d used in key file %.200s.",
373 cipher_type, filename);
Damien Miller95def091999-11-25 00:26:21 +1100374 buffer_free(&buffer);
375 goto fail;
376 }
377 /* Initialize space for decrypted data. */
378 buffer_init(&decrypted);
379 buffer_append_space(&decrypted, &cp, buffer_len(&buffer));
380
381 /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
Damien Miller874d77b2000-10-14 16:23:11 +1100382 cipher_set_key_string(&ciphercontext, cipher, passphrase);
Ben Lindstrom46c16222000-12-22 01:43:59 +0000383 cipher_decrypt(&ciphercontext, (u_char *) cp,
384 (u_char *) buffer_ptr(&buffer), buffer_len(&buffer));
Damien Miller874d77b2000-10-14 16:23:11 +1100385 memset(&ciphercontext, 0, sizeof(ciphercontext));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000386 buffer_free(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000387
Damien Miller95def091999-11-25 00:26:21 +1100388 check1 = buffer_get_char(&decrypted);
389 check2 = buffer_get_char(&decrypted);
390 if (check1 != buffer_get_char(&decrypted) ||
391 check2 != buffer_get_char(&decrypted)) {
392 if (strcmp(passphrase, "") != 0)
Ben Lindstromd0fca422001-03-26 13:44:06 +0000393 debug("Bad passphrase supplied for key file %.200s.",
394 filename);
Damien Miller95def091999-11-25 00:26:21 +1100395 /* Bad passphrase. */
396 buffer_free(&decrypted);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000397 goto fail;
Damien Miller95def091999-11-25 00:26:21 +1100398 }
399 /* Read the rest of the private key. */
Ben Lindstromd0fca422001-03-26 13:44:06 +0000400 buffer_get_bignum(&decrypted, prv->rsa->d);
401 buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
402 /* in SSL and SSH v1 p and q are exchanged */
403 buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
404 buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000405
Ben Lindstromd0fca422001-03-26 13:44:06 +0000406 /* calculate p-1 and q-1 */
Damien Miller95def091999-11-25 00:26:21 +1100407 ctx = BN_CTX_new();
408 aux = BN_new();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000409
Ben Lindstromd0fca422001-03-26 13:44:06 +0000410 BN_sub(aux, prv->rsa->q, BN_value_one());
411 BN_mod(prv->rsa->dmq1, prv->rsa->d, aux, ctx);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000412
Ben Lindstromd0fca422001-03-26 13:44:06 +0000413 BN_sub(aux, prv->rsa->p, BN_value_one());
414 BN_mod(prv->rsa->dmp1, prv->rsa->d, aux, ctx);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000415
Damien Miller95def091999-11-25 00:26:21 +1100416 BN_clear_free(aux);
417 BN_CTX_free(ctx);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000418
Damien Miller95def091999-11-25 00:26:21 +1100419 buffer_free(&decrypted);
Ben Lindstromb257cca2001-03-05 04:59:27 +0000420 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000421 return prv;
422
423fail:
424 if (commentp)
425 xfree(*commentp);
426 close(fd);
427 key_free(prv);
428 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000429}
Damien Millereba71ba2000-04-29 23:57:08 +1000430
Ben Lindstromd0fca422001-03-26 13:44:06 +0000431Key *
432key_load_private_pem(int fd, int type, const char *passphrase,
433 char **commentp)
Damien Millereba71ba2000-04-29 23:57:08 +1000434{
Damien Millereba71ba2000-04-29 23:57:08 +1000435 FILE *fp;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100436 EVP_PKEY *pk = NULL;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000437 Key *prv = NULL;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100438 char *name = "<no key>";
Damien Millereba71ba2000-04-29 23:57:08 +1000439
Damien Millereba71ba2000-04-29 23:57:08 +1000440 fp = fdopen(fd, "r");
441 if (fp == NULL) {
442 error("fdopen failed");
Ben Lindstromb257cca2001-03-05 04:59:27 +0000443 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000444 return NULL;
Damien Millereba71ba2000-04-29 23:57:08 +1000445 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100446 pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
447 if (pk == NULL) {
448 debug("PEM_read_PrivateKey failed");
449 (void)ERR_get_error();
Ben Lindstromd0fca422001-03-26 13:44:06 +0000450 } else if (pk->type == EVP_PKEY_RSA &&
451 (type == KEY_UNSPEC||type==KEY_RSA)) {
452 prv = key_new(KEY_UNSPEC);
453 prv->rsa = EVP_PKEY_get1_RSA(pk);
454 prv->type = KEY_RSA;
455 name = "rsa w/o comment";
Damien Miller0bc1bd82000-11-13 22:57:25 +1100456#ifdef DEBUG_PK
Ben Lindstromd0fca422001-03-26 13:44:06 +0000457 RSA_print_fp(stderr, prv->rsa, 8);
Damien Millereba71ba2000-04-29 23:57:08 +1000458#endif
Ben Lindstromd0fca422001-03-26 13:44:06 +0000459 } else if (pk->type == EVP_PKEY_DSA &&
460 (type == KEY_UNSPEC||type==KEY_DSA)) {
461 prv = key_new(KEY_UNSPEC);
462 prv->dsa = EVP_PKEY_get1_DSA(pk);
463 prv->type = KEY_DSA;
464 name = "dsa w/o comment";
Damien Miller0bc1bd82000-11-13 22:57:25 +1100465#ifdef DEBUG_PK
Ben Lindstromd0fca422001-03-26 13:44:06 +0000466 DSA_print_fp(stderr, prv->dsa, 8);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100467#endif
Damien Miller0bc1bd82000-11-13 22:57:25 +1100468 } else {
469 error("PEM_read_PrivateKey: mismatch or "
470 "unknown EVP_PKEY save_type %d", pk->save_type);
471 }
472 fclose(fp);
473 if (pk != NULL)
474 EVP_PKEY_free(pk);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000475 if (prv != NULL && commentp)
476 *commentp = xstrdup(name);
477 debug("read PEM private key done: type %s",
478 prv ? key_type(prv) : "<unknown>");
479 return prv;
Damien Millereba71ba2000-04-29 23:57:08 +1000480}
481
482int
Ben Lindstromd0fca422001-03-26 13:44:06 +0000483key_perm_ok(int fd, const char *filename)
Damien Millereba71ba2000-04-29 23:57:08 +1000484{
Damien Millereba71ba2000-04-29 23:57:08 +1000485 struct stat st;
486
Damien Millercb5e44a2000-09-29 12:12:36 +1100487 /* check owner and modes */
Damien Millerb70b61f2000-09-16 16:25:12 +1100488#ifdef HAVE_CYGWIN
Damien Millercb5e44a2000-09-29 12:12:36 +1100489 if (check_ntsec(filename))
Damien Millerb70b61f2000-09-16 16:25:12 +1100490#endif
Damien Millereba71ba2000-04-29 23:57:08 +1000491 if (fstat(fd, &st) < 0 ||
Ben Lindstrom46c16222000-12-22 01:43:59 +0000492 (st.st_uid != 0 && getuid() != 0 && st.st_uid != getuid()) ||
Damien Millereba71ba2000-04-29 23:57:08 +1000493 (st.st_mode & 077) != 0) {
494 close(fd);
495 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
496 error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
497 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
498 error("Bad ownership or mode(0%3.3o) for '%s'.",
Ben Lindstromb257cca2001-03-05 04:59:27 +0000499 st.st_mode & 0777, filename);
Damien Millereba71ba2000-04-29 23:57:08 +1000500 error("It is recommended that your private key files are NOT accessible by others.");
Ben Lindstromd0fca422001-03-26 13:44:06 +0000501 error("This private key will be ignored.");
Damien Millereba71ba2000-04-29 23:57:08 +1000502 return 0;
503 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000504 return 1;
505}
Ben Lindstromb257cca2001-03-05 04:59:27 +0000506
Ben Lindstromd0fca422001-03-26 13:44:06 +0000507Key *
508key_load_private_type(int type, const char *filename, const char *passphrase,
509 char **commentp)
510{
511 int fd;
512
513 fd = open(filename, O_RDONLY);
514 if (fd < 0)
515 return NULL;
516 if (!key_perm_ok(fd, filename)) {
517 debug("bad permissions: ignore key: %s", filename);
518 close(fd);
519 return NULL;
520 }
521 switch (type) {
522 case KEY_RSA1:
523 return key_load_private_rsa1(fd, filename, passphrase,
524 commentp);
525 /* closes fd */
Damien Millereba71ba2000-04-29 23:57:08 +1000526 break;
527 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100528 case KEY_RSA:
529 case KEY_UNSPEC:
Ben Lindstromd0fca422001-03-26 13:44:06 +0000530 return key_load_private_pem(fd, type, passphrase, commentp);
531 /* closes fd */
Ben Lindstromb257cca2001-03-05 04:59:27 +0000532 break;
Damien Millereba71ba2000-04-29 23:57:08 +1000533 default:
Ben Lindstromb257cca2001-03-05 04:59:27 +0000534 close(fd);
Damien Millereba71ba2000-04-29 23:57:08 +1000535 break;
536 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000537 return NULL;
538}
539
540Key *
541key_load_private(const char *filename, const char *passphrase,
542 char **commentp)
543{
544 Key *pub;
545 int fd;
546
547 fd = open(filename, O_RDONLY);
548 if (fd < 0)
549 return NULL;
550 if (!key_perm_ok(fd, filename)) {
551 debug("bad permissions: ignore key: %s", filename);
552 close(fd);
553 return NULL;
554 }
555 pub = key_load_public_rsa1(fd, filename, commentp);
556 lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
557 if (pub == NULL) {
558 /* closes fd */
559 return key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
560 } else {
561 /* it's a SSH v1 key if the public key part is readable */
562 key_free(pub);
563 /* closes fd */
564 return key_load_private_rsa1(fd, filename, passphrase, NULL);
565 }
Damien Millereba71ba2000-04-29 23:57:08 +1000566}
Damien Millere4340be2000-09-16 13:29:08 +1100567
568int
Ben Lindstromd0fca422001-03-26 13:44:06 +0000569key_try_load_public(Key *k, const char *filename, char **commentp)
Damien Millere4340be2000-09-16 13:29:08 +1100570{
571 FILE *f;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000572 char line[4096];
Damien Millere4340be2000-09-16 13:29:08 +1100573 char *cp;
574
575 f = fopen(filename, "r");
576 if (f != NULL) {
577 while (fgets(line, sizeof(line), f)) {
578 line[sizeof(line)-1] = '\0';
579 cp = line;
580 switch(*cp){
581 case '#':
582 case '\n':
583 case '\0':
584 continue;
585 }
586 /* Skip leading whitespace. */
587 for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
588 ;
589 if (*cp) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100590 if (key_read(k, &cp) == 1) {
Damien Millere4340be2000-09-16 13:29:08 +1100591 if (commentp)
592 *commentp=xstrdup(filename);
593 fclose(f);
594 return 1;
595 }
596 }
597 }
598 fclose(f);
599 }
600 return 0;
601}
602
Ben Lindstromd0fca422001-03-26 13:44:06 +0000603/* load public key from ssh v1 private or any pubkey file */
604Key *
605key_load_public(const char *filename, char **commentp)
Damien Millere4340be2000-09-16 13:29:08 +1100606{
Ben Lindstromd0fca422001-03-26 13:44:06 +0000607 Key *pub;
608 char file[MAXPATHLEN];
Damien Millere4340be2000-09-16 13:29:08 +1100609
Ben Lindstromd0fca422001-03-26 13:44:06 +0000610 pub = key_load_public_type(KEY_RSA1, filename, commentp);
611 if (pub != NULL)
612 return pub;
613 pub = key_new(KEY_UNSPEC);
614 if (key_try_load_public(pub, filename, commentp) == 1)
615 return pub;
616 if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
617 (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
618 (key_try_load_public(pub, file, commentp) == 1))
619 return pub;
620 key_free(pub);
621 return NULL;
Damien Millere4340be2000-09-16 13:29:08 +1100622}