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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 Lindstromc5a7f4f2002-06-25 23:19:13 +000039RCSID("$OpenBSD: authfile.c,v 1.50 2002/06/24 14:55:38 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 Miller040b64f2002-01-22 23:10:04 +110053#include "rsa.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100054
Ben Lindstromd0fca422001-03-26 13:44:06 +000055/* Version identification string for SSH v1 identity files. */
Ben Lindstrom1170d712001-01-29 07:51:26 +000056static const char authfile_id_string[] =
57 "SSH PRIVATE KEY FILE FORMAT 1.1\n";
Damien Millerd4a8b7e1999-10-27 13:42:43 +100058
Damien Miller5428f641999-11-25 11:54:57 +110059/*
60 * Saves the authentication (private) key in a file, encrypting it with
61 * passphrase. The identification of the file (lowest 64 bits of n) will
62 * precede the key to provide identification of the key without needing a
63 * passphrase.
64 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100065
Ben Lindstrombba81212001-06-25 05:01:22 +000066static int
Ben Lindstromd0fca422001-03-26 13:44:06 +000067key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
68 const char *comment)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100069{
Damien Miller95def091999-11-25 00:26:21 +110070 Buffer buffer, encrypted;
Damien Miller708d21c2002-01-22 23:18:15 +110071 u_char buf[100], *cp;
Damien Miller963f6b22002-02-19 15:21:23 +110072 int fd, i, cipher_num;
Damien Miller874d77b2000-10-14 16:23:11 +110073 CipherContext ciphercontext;
74 Cipher *cipher;
Damien Miller95def091999-11-25 00:26:21 +110075 u_int32_t rand;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100076
Damien Miller5428f641999-11-25 11:54:57 +110077 /*
78 * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
79 * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
80 */
Damien Miller963f6b22002-02-19 15:21:23 +110081 cipher_num = (strcmp(passphrase, "") == 0) ?
82 SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
83 if ((cipher = cipher_by_number(cipher_num)) == NULL)
Damien Miller874d77b2000-10-14 16:23:11 +110084 fatal("save_private_key_rsa: bad cipher");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100085
Damien Miller95def091999-11-25 00:26:21 +110086 /* This buffer is used to built the secret part of the private key. */
87 buffer_init(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100088
Damien Miller95def091999-11-25 00:26:21 +110089 /* Put checkbytes for checking passphrase validity. */
90 rand = arc4random();
91 buf[0] = rand & 0xff;
92 buf[1] = (rand >> 8) & 0xff;
93 buf[2] = buf[0];
94 buf[3] = buf[1];
95 buffer_append(&buffer, buf, 4);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100096
Damien Miller5428f641999-11-25 11:54:57 +110097 /*
98 * Store the private key (n and e will not be stored because they
99 * will be stored in plain text, and storing them also in encrypted
100 * format would just give known plaintext).
101 */
Ben Lindstromd0fca422001-03-26 13:44:06 +0000102 buffer_put_bignum(&buffer, key->rsa->d);
103 buffer_put_bignum(&buffer, key->rsa->iqmp);
104 buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
105 buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000106
Damien Miller95def091999-11-25 00:26:21 +1100107 /* Pad the part to be encrypted until its size is a multiple of 8. */
108 while (buffer_len(&buffer) % 8 != 0)
109 buffer_put_char(&buffer, 0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000110
Damien Miller95def091999-11-25 00:26:21 +1100111 /* This buffer will be used to contain the data in the file. */
112 buffer_init(&encrypted);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000113
Damien Miller95def091999-11-25 00:26:21 +1100114 /* First store keyfile id string. */
Ben Lindstrom1170d712001-01-29 07:51:26 +0000115 for (i = 0; authfile_id_string[i]; i++)
116 buffer_put_char(&encrypted, authfile_id_string[i]);
Damien Miller95def091999-11-25 00:26:21 +1100117 buffer_put_char(&encrypted, 0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000118
Damien Miller95def091999-11-25 00:26:21 +1100119 /* Store cipher type. */
Damien Miller963f6b22002-02-19 15:21:23 +1100120 buffer_put_char(&encrypted, cipher_num);
Damien Miller95def091999-11-25 00:26:21 +1100121 buffer_put_int(&encrypted, 0); /* For future extension */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000122
Damien Miller95def091999-11-25 00:26:21 +1100123 /* Store public key. This will be in plain text. */
Ben Lindstromd0fca422001-03-26 13:44:06 +0000124 buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
125 buffer_put_bignum(&encrypted, key->rsa->n);
126 buffer_put_bignum(&encrypted, key->rsa->e);
Ben Lindstrom664408d2001-06-09 01:42:01 +0000127 buffer_put_cstring(&encrypted, comment);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000128
Damien Miller95def091999-11-25 00:26:21 +1100129 /* Allocate space for the private part of the key in the buffer. */
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100130 cp = buffer_append_space(&encrypted, buffer_len(&buffer));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000131
Damien Miller963f6b22002-02-19 15:21:23 +1100132 cipher_set_key_string(&ciphercontext, cipher, passphrase,
133 CIPHER_ENCRYPT);
134 cipher_crypt(&ciphercontext, cp,
Damien Miller708d21c2002-01-22 23:18:15 +1100135 buffer_ptr(&buffer), buffer_len(&buffer));
Damien Miller963f6b22002-02-19 15:21:23 +1100136 cipher_cleanup(&ciphercontext);
Damien Miller874d77b2000-10-14 16:23:11 +1100137 memset(&ciphercontext, 0, sizeof(ciphercontext));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000138
Damien Miller95def091999-11-25 00:26:21 +1100139 /* Destroy temporary data. */
140 memset(buf, 0, sizeof(buf));
141 buffer_free(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000142
Damien Miller037a0dc1999-12-07 15:38:31 +1100143 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
Ben Lindstrom15f33862001-04-16 02:00:02 +0000144 if (fd < 0) {
145 error("open %s failed: %s.", filename, strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100146 return 0;
Ben Lindstrom15f33862001-04-16 02:00:02 +0000147 }
Damien Miller037a0dc1999-12-07 15:38:31 +1100148 if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
Damien Miller95def091999-11-25 00:26:21 +1100149 buffer_len(&encrypted)) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000150 error("write to key file %s failed: %s", filename,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100151 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100152 buffer_free(&encrypted);
Damien Miller037a0dc1999-12-07 15:38:31 +1100153 close(fd);
Damien Miller78315eb2000-09-29 23:01:36 +1100154 unlink(filename);
Damien Miller95def091999-11-25 00:26:21 +1100155 return 0;
156 }
Damien Miller037a0dc1999-12-07 15:38:31 +1100157 close(fd);
Damien Miller95def091999-11-25 00:26:21 +1100158 buffer_free(&encrypted);
159 return 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000160}
161
Ben Lindstromd0fca422001-03-26 13:44:06 +0000162/* save SSH v2 key in OpenSSL PEM format */
Ben Lindstrombba81212001-06-25 05:01:22 +0000163static int
Ben Lindstromd0fca422001-03-26 13:44:06 +0000164key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
165 const char *comment)
Damien Millereba71ba2000-04-29 23:57:08 +1000166{
167 FILE *fp;
168 int fd;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100169 int success = 0;
170 int len = strlen(_passphrase);
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000171 u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
Ben Lindstrom80cb27d2002-03-05 01:33:36 +0000172 const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
Damien Millereba71ba2000-04-29 23:57:08 +1000173
174 if (len > 0 && len <= 4) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000175 error("passphrase too short: have %d bytes, need > 4", len);
Damien Millereba71ba2000-04-29 23:57:08 +1000176 return 0;
177 }
178 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
179 if (fd < 0) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000180 error("open %s failed: %s.", filename, strerror(errno));
Damien Millereba71ba2000-04-29 23:57:08 +1000181 return 0;
182 }
183 fp = fdopen(fd, "w");
184 if (fp == NULL ) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000185 error("fdopen %s failed: %s.", filename, strerror(errno));
Damien Millereba71ba2000-04-29 23:57:08 +1000186 close(fd);
187 return 0;
188 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100189 switch (key->type) {
Ben Lindstromc1116602001-03-29 00:28:37 +0000190 case KEY_DSA:
191 success = PEM_write_DSAPrivateKey(fp, key->dsa,
192 cipher, passphrase, len, NULL, NULL);
193 break;
194 case KEY_RSA:
195 success = PEM_write_RSAPrivateKey(fp, key->rsa,
196 cipher, passphrase, len, NULL, NULL);
197 break;
Damien Millereba71ba2000-04-29 23:57:08 +1000198 }
199 fclose(fp);
200 return success;
201}
202
203int
Ben Lindstromd0fca422001-03-26 13:44:06 +0000204key_save_private(Key *key, const char *filename, const char *passphrase,
Damien Millereba71ba2000-04-29 23:57:08 +1000205 const char *comment)
206{
207 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100208 case KEY_RSA1:
Ben Lindstromd0fca422001-03-26 13:44:06 +0000209 return key_save_private_rsa1(key, filename, passphrase,
210 comment);
Damien Millereba71ba2000-04-29 23:57:08 +1000211 break;
212 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100213 case KEY_RSA:
Ben Lindstromd0fca422001-03-26 13:44:06 +0000214 return key_save_private_pem(key, filename, passphrase,
215 comment);
Damien Millereba71ba2000-04-29 23:57:08 +1000216 break;
217 default:
218 break;
219 }
Ben Lindstrom15f33862001-04-16 02:00:02 +0000220 error("key_save_private: cannot save key type %d", key->type);
Damien Millereba71ba2000-04-29 23:57:08 +1000221 return 0;
222}
223
Damien Miller5428f641999-11-25 11:54:57 +1100224/*
Ben Lindstromd0fca422001-03-26 13:44:06 +0000225 * Loads the public part of the ssh v1 key file. Returns NULL if an error was
226 * encountered (the file does not exist or is not readable), and the key
Damien Miller5428f641999-11-25 11:54:57 +1100227 * otherwise.
228 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000229
Ben Lindstrombba81212001-06-25 05:01:22 +0000230static Key *
Ben Lindstromd0fca422001-03-26 13:44:06 +0000231key_load_public_rsa1(int fd, const char *filename, char **commentp)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000232{
Damien Miller95def091999-11-25 00:26:21 +1100233 Buffer buffer;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000234 Key *pub;
Damien Miller95def091999-11-25 00:26:21 +1100235 char *cp;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000236 int i;
237 off_t len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000238
Damien Miller037a0dc1999-12-07 15:38:31 +1100239 len = lseek(fd, (off_t) 0, SEEK_END);
240 lseek(fd, (off_t) 0, SEEK_SET);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000241
Damien Miller95def091999-11-25 00:26:21 +1100242 buffer_init(&buffer);
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100243 cp = buffer_append_space(&buffer, len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000244
Damien Miller037a0dc1999-12-07 15:38:31 +1100245 if (read(fd, cp, (size_t) len) != (size_t) len) {
Damien Miller95def091999-11-25 00:26:21 +1100246 debug("Read from key file %.200s failed: %.100s", filename,
Damien Millereba71ba2000-04-29 23:57:08 +1000247 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100248 buffer_free(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000249 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100250 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000251
Ben Lindstrom1170d712001-01-29 07:51:26 +0000252 /* Check that it is at least big enough to contain the ID string. */
253 if (len < sizeof(authfile_id_string)) {
Damien Miller058655c2001-10-10 15:03:36 +1000254 debug3("Not a RSA1 key file %.200s.", filename);
Damien Miller95def091999-11-25 00:26:21 +1100255 buffer_free(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000256 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100257 }
Damien Miller5428f641999-11-25 11:54:57 +1100258 /*
259 * Make sure it begins with the id string. Consume the id string
260 * from the buffer.
261 */
Ben Lindstrom1170d712001-01-29 07:51:26 +0000262 for (i = 0; i < sizeof(authfile_id_string); i++)
263 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
Damien Miller058655c2001-10-10 15:03:36 +1000264 debug3("Not a RSA1 key file %.200s.", filename);
Damien Miller95def091999-11-25 00:26:21 +1100265 buffer_free(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000266 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100267 }
268 /* Skip cipher type and reserved data. */
269 (void) buffer_get_char(&buffer); /* cipher type */
270 (void) buffer_get_int(&buffer); /* reserved */
271
272 /* Read the public key from the buffer. */
Ben Lindstromc5a7f4f2002-06-25 23:19:13 +0000273 (void) buffer_get_int(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000274 pub = key_new(KEY_RSA1);
275 buffer_get_bignum(&buffer, pub->rsa->n);
276 buffer_get_bignum(&buffer, pub->rsa->e);
277 if (commentp)
278 *commentp = buffer_get_string(&buffer, NULL);
Damien Miller95def091999-11-25 00:26:21 +1100279 /* The encrypted private part is not parsed by this function. */
280
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000281 buffer_free(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000282 return pub;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000283}
284
Ben Lindstromd0fca422001-03-26 13:44:06 +0000285/* load public key from private-key file, works only for SSH v1 */
286Key *
287key_load_public_type(int type, const char *filename, char **commentp)
Damien Millereba71ba2000-04-29 23:57:08 +1000288{
Ben Lindstromd0fca422001-03-26 13:44:06 +0000289 Key *pub;
290 int fd;
291
292 if (type == KEY_RSA1) {
293 fd = open(filename, O_RDONLY);
294 if (fd < 0)
295 return NULL;
296 pub = key_load_public_rsa1(fd, filename, commentp);
297 close(fd);
298 return pub;
Damien Millereba71ba2000-04-29 23:57:08 +1000299 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000300 return NULL;
Damien Millereba71ba2000-04-29 23:57:08 +1000301}
302
Damien Miller5428f641999-11-25 11:54:57 +1100303/*
304 * Loads the private key from the file. Returns 0 if an error is encountered
305 * (file does not exist or is not readable, or passphrase is bad). This
306 * initializes the private key.
307 * Assumes we are called under uid of the owner of the file.
308 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000309
Ben Lindstrombba81212001-06-25 05:01:22 +0000310static Key *
Ben Lindstromd0fca422001-03-26 13:44:06 +0000311key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
312 char **commentp)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000313{
Damien Millereba71ba2000-04-29 23:57:08 +1000314 int i, check1, check2, cipher_type;
Damien Miller95def091999-11-25 00:26:21 +1100315 off_t len;
316 Buffer buffer, decrypted;
Damien Miller708d21c2002-01-22 23:18:15 +1100317 u_char *cp;
Damien Miller874d77b2000-10-14 16:23:11 +1100318 CipherContext ciphercontext;
319 Cipher *cipher;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000320 Key *prv = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000321
Damien Miller037a0dc1999-12-07 15:38:31 +1100322 len = lseek(fd, (off_t) 0, SEEK_END);
323 lseek(fd, (off_t) 0, SEEK_SET);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000324
Damien Miller95def091999-11-25 00:26:21 +1100325 buffer_init(&buffer);
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100326 cp = buffer_append_space(&buffer, len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000327
Damien Miller037a0dc1999-12-07 15:38:31 +1100328 if (read(fd, cp, (size_t) len) != (size_t) len) {
Damien Miller95def091999-11-25 00:26:21 +1100329 debug("Read from key file %.200s failed: %.100s", filename,
Damien Miller0bc1bd82000-11-13 22:57:25 +1100330 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100331 buffer_free(&buffer);
Damien Miller037a0dc1999-12-07 15:38:31 +1100332 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000333 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100334 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000335
Ben Lindstrom1170d712001-01-29 07:51:26 +0000336 /* Check that it is at least big enough to contain the ID string. */
337 if (len < sizeof(authfile_id_string)) {
Damien Miller058655c2001-10-10 15:03:36 +1000338 debug3("Not a RSA1 key file %.200s.", filename);
Damien Miller95def091999-11-25 00:26:21 +1100339 buffer_free(&buffer);
Ben Lindstromb257cca2001-03-05 04:59:27 +0000340 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000341 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100342 }
Damien Miller5428f641999-11-25 11:54:57 +1100343 /*
344 * Make sure it begins with the id string. Consume the id string
345 * from the buffer.
346 */
Ben Lindstrom1170d712001-01-29 07:51:26 +0000347 for (i = 0; i < sizeof(authfile_id_string); i++)
348 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
Damien Miller058655c2001-10-10 15:03:36 +1000349 debug3("Not a RSA1 key file %.200s.", filename);
Damien Miller95def091999-11-25 00:26:21 +1100350 buffer_free(&buffer);
Ben Lindstromb257cca2001-03-05 04:59:27 +0000351 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000352 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100353 }
Ben Lindstromb257cca2001-03-05 04:59:27 +0000354
Damien Miller95def091999-11-25 00:26:21 +1100355 /* Read cipher type. */
356 cipher_type = buffer_get_char(&buffer);
357 (void) buffer_get_int(&buffer); /* Reserved data. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000358
Damien Miller95def091999-11-25 00:26:21 +1100359 /* Read the public key from the buffer. */
Ben Lindstromc5a7f4f2002-06-25 23:19:13 +0000360 (void) buffer_get_int(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000361 prv = key_new_private(KEY_RSA1);
362
363 buffer_get_bignum(&buffer, prv->rsa->n);
364 buffer_get_bignum(&buffer, prv->rsa->e);
365 if (commentp)
366 *commentp = buffer_get_string(&buffer, NULL);
Damien Miller95def091999-11-25 00:26:21 +1100367 else
368 xfree(buffer_get_string(&buffer, NULL));
369
370 /* Check that it is a supported cipher. */
Damien Miller874d77b2000-10-14 16:23:11 +1100371 cipher = cipher_by_number(cipher_type);
372 if (cipher == NULL) {
373 debug("Unsupported cipher %d used in key file %.200s.",
374 cipher_type, filename);
Damien Miller95def091999-11-25 00:26:21 +1100375 buffer_free(&buffer);
376 goto fail;
377 }
378 /* Initialize space for decrypted data. */
379 buffer_init(&decrypted);
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100380 cp = buffer_append_space(&decrypted, buffer_len(&buffer));
Damien Miller95def091999-11-25 00:26:21 +1100381
382 /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
Damien Miller963f6b22002-02-19 15:21:23 +1100383 cipher_set_key_string(&ciphercontext, cipher, passphrase,
384 CIPHER_DECRYPT);
385 cipher_crypt(&ciphercontext, cp,
Damien Miller708d21c2002-01-22 23:18:15 +1100386 buffer_ptr(&buffer), buffer_len(&buffer));
Damien Miller963f6b22002-02-19 15:21:23 +1100387 cipher_cleanup(&ciphercontext);
Damien Miller874d77b2000-10-14 16:23:11 +1100388 memset(&ciphercontext, 0, sizeof(ciphercontext));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000389 buffer_free(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000390
Damien Miller95def091999-11-25 00:26:21 +1100391 check1 = buffer_get_char(&decrypted);
392 check2 = buffer_get_char(&decrypted);
393 if (check1 != buffer_get_char(&decrypted) ||
394 check2 != buffer_get_char(&decrypted)) {
395 if (strcmp(passphrase, "") != 0)
Ben Lindstromd0fca422001-03-26 13:44:06 +0000396 debug("Bad passphrase supplied for key file %.200s.",
397 filename);
Damien Miller95def091999-11-25 00:26:21 +1100398 /* Bad passphrase. */
399 buffer_free(&decrypted);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000400 goto fail;
Damien Miller95def091999-11-25 00:26:21 +1100401 }
402 /* Read the rest of the private key. */
Ben Lindstromd0fca422001-03-26 13:44:06 +0000403 buffer_get_bignum(&decrypted, prv->rsa->d);
404 buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
405 /* in SSL and SSH v1 p and q are exchanged */
406 buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
407 buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000408
Ben Lindstromd0fca422001-03-26 13:44:06 +0000409 /* calculate p-1 and q-1 */
Damien Millerda755162002-01-22 23:09:22 +1100410 rsa_generate_additional_parameters(prv->rsa);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000411
Damien Miller95def091999-11-25 00:26:21 +1100412 buffer_free(&decrypted);
Ben Lindstromb257cca2001-03-05 04:59:27 +0000413 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000414 return prv;
415
416fail:
417 if (commentp)
418 xfree(*commentp);
419 close(fd);
420 key_free(prv);
421 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000422}
Damien Millereba71ba2000-04-29 23:57:08 +1000423
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000424Key *
Ben Lindstromd0fca422001-03-26 13:44:06 +0000425key_load_private_pem(int fd, int type, const char *passphrase,
426 char **commentp)
Damien Millereba71ba2000-04-29 23:57:08 +1000427{
Damien Millereba71ba2000-04-29 23:57:08 +1000428 FILE *fp;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100429 EVP_PKEY *pk = NULL;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000430 Key *prv = NULL;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100431 char *name = "<no key>";
Damien Millereba71ba2000-04-29 23:57:08 +1000432
Damien Millereba71ba2000-04-29 23:57:08 +1000433 fp = fdopen(fd, "r");
434 if (fp == NULL) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000435 error("fdopen failed: %s", strerror(errno));
Ben Lindstromb257cca2001-03-05 04:59:27 +0000436 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000437 return NULL;
Damien Millereba71ba2000-04-29 23:57:08 +1000438 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100439 pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
440 if (pk == NULL) {
Ben Lindstrom648772f2001-04-19 20:47:10 +0000441 debug("PEM_read_PrivateKey failed");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100442 (void)ERR_get_error();
Ben Lindstromd0fca422001-03-26 13:44:06 +0000443 } else if (pk->type == EVP_PKEY_RSA &&
Damien Miller9f0f5c62001-12-21 14:45:46 +1100444 (type == KEY_UNSPEC||type==KEY_RSA)) {
Ben Lindstromd0fca422001-03-26 13:44:06 +0000445 prv = key_new(KEY_UNSPEC);
446 prv->rsa = EVP_PKEY_get1_RSA(pk);
447 prv->type = KEY_RSA;
448 name = "rsa w/o comment";
Damien Miller0bc1bd82000-11-13 22:57:25 +1100449#ifdef DEBUG_PK
Ben Lindstromd0fca422001-03-26 13:44:06 +0000450 RSA_print_fp(stderr, prv->rsa, 8);
Damien Millereba71ba2000-04-29 23:57:08 +1000451#endif
Ben Lindstromd0fca422001-03-26 13:44:06 +0000452 } else if (pk->type == EVP_PKEY_DSA &&
Damien Miller9f0f5c62001-12-21 14:45:46 +1100453 (type == KEY_UNSPEC||type==KEY_DSA)) {
Ben Lindstromd0fca422001-03-26 13:44:06 +0000454 prv = key_new(KEY_UNSPEC);
455 prv->dsa = EVP_PKEY_get1_DSA(pk);
456 prv->type = KEY_DSA;
457 name = "dsa w/o comment";
Damien Miller0bc1bd82000-11-13 22:57:25 +1100458#ifdef DEBUG_PK
Ben Lindstromd0fca422001-03-26 13:44:06 +0000459 DSA_print_fp(stderr, prv->dsa, 8);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100460#endif
Damien Miller0bc1bd82000-11-13 22:57:25 +1100461 } else {
462 error("PEM_read_PrivateKey: mismatch or "
463 "unknown EVP_PKEY save_type %d", pk->save_type);
464 }
465 fclose(fp);
466 if (pk != NULL)
467 EVP_PKEY_free(pk);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000468 if (prv != NULL && commentp)
469 *commentp = xstrdup(name);
470 debug("read PEM private key done: type %s",
471 prv ? key_type(prv) : "<unknown>");
472 return prv;
Damien Millereba71ba2000-04-29 23:57:08 +1000473}
474
Ben Lindstrombba81212001-06-25 05:01:22 +0000475static int
Ben Lindstromd0fca422001-03-26 13:44:06 +0000476key_perm_ok(int fd, const char *filename)
Damien Millereba71ba2000-04-29 23:57:08 +1000477{
Damien Millereba71ba2000-04-29 23:57:08 +1000478 struct stat st;
479
Ben Lindstrom7aff2612001-09-23 13:53:22 +0000480 if (fstat(fd, &st) < 0)
481 return 0;
482 /*
483 * if a key owned by the user is accessed, then we check the
484 * permissions of the file. if the key owned by a different user,
485 * then we don't care.
486 */
Damien Millerb70b61f2000-09-16 16:25:12 +1100487#ifdef HAVE_CYGWIN
Damien Millercb5e44a2000-09-29 12:12:36 +1100488 if (check_ntsec(filename))
Damien Millerb70b61f2000-09-16 16:25:12 +1100489#endif
Ben Lindstrom7aff2612001-09-23 13:53:22 +0000490 if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
Damien Millereba71ba2000-04-29 23:57:08 +1000491 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
492 error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
493 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
Ben Lindstrom7aff2612001-09-23 13:53:22 +0000494 error("Permissions 0%3.3o for '%s' are too open.",
Ben Lindstromb257cca2001-03-05 04:59:27 +0000495 st.st_mode & 0777, filename);
Damien Millereba71ba2000-04-29 23:57:08 +1000496 error("It is recommended that your private key files are NOT accessible by others.");
Ben Lindstromd0fca422001-03-26 13:44:06 +0000497 error("This private key will be ignored.");
Damien Millereba71ba2000-04-29 23:57:08 +1000498 return 0;
499 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000500 return 1;
501}
Ben Lindstromb257cca2001-03-05 04:59:27 +0000502
Ben Lindstromd0fca422001-03-26 13:44:06 +0000503Key *
504key_load_private_type(int type, const char *filename, const char *passphrase,
505 char **commentp)
506{
507 int fd;
508
509 fd = open(filename, O_RDONLY);
510 if (fd < 0)
511 return NULL;
512 if (!key_perm_ok(fd, filename)) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000513 error("bad permissions: ignore key: %s", filename);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000514 close(fd);
515 return NULL;
516 }
517 switch (type) {
518 case KEY_RSA1:
519 return key_load_private_rsa1(fd, filename, passphrase,
520 commentp);
521 /* closes fd */
Damien Millereba71ba2000-04-29 23:57:08 +1000522 break;
523 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100524 case KEY_RSA:
525 case KEY_UNSPEC:
Ben Lindstromd0fca422001-03-26 13:44:06 +0000526 return key_load_private_pem(fd, type, passphrase, commentp);
527 /* closes fd */
Ben Lindstromb257cca2001-03-05 04:59:27 +0000528 break;
Damien Millereba71ba2000-04-29 23:57:08 +1000529 default:
Ben Lindstromb257cca2001-03-05 04:59:27 +0000530 close(fd);
Damien Millereba71ba2000-04-29 23:57:08 +1000531 break;
532 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000533 return NULL;
534}
535
536Key *
537key_load_private(const char *filename, const char *passphrase,
538 char **commentp)
539{
Ben Lindstrom322915d2001-06-05 20:46:32 +0000540 Key *pub, *prv;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000541 int fd;
542
543 fd = open(filename, O_RDONLY);
544 if (fd < 0)
545 return NULL;
546 if (!key_perm_ok(fd, filename)) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000547 error("bad permissions: ignore key: %s", filename);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000548 close(fd);
549 return NULL;
550 }
551 pub = key_load_public_rsa1(fd, filename, commentp);
552 lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
553 if (pub == NULL) {
554 /* closes fd */
Ben Lindstrom322915d2001-06-05 20:46:32 +0000555 prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
556 /* use the filename as a comment for PEM */
557 if (commentp && prv)
Ben Lindstrom2d0356f2001-06-05 21:13:57 +0000558 *commentp = xstrdup(filename);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000559 } else {
560 /* it's a SSH v1 key if the public key part is readable */
561 key_free(pub);
562 /* closes fd */
Ben Lindstrom322915d2001-06-05 20:46:32 +0000563 prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000564 }
Ben Lindstrom322915d2001-06-05 20:46:32 +0000565 return prv;
Damien Millereba71ba2000-04-29 23:57:08 +1000566}
Damien Millere4340be2000-09-16 13:29:08 +1100567
Ben Lindstrombba81212001-06-25 05:01:22 +0000568static int
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;
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000580 switch (*cp) {
Damien Millere4340be2000-09-16 13:29:08 +1100581 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}