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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 Lindstrom44adb8f2002-12-23 02:00:23 +000039RCSID("$OpenBSD: authfile.c,v 1.51 2002/11/15 10:03:09 fgsch 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;
Ben Lindstrom44adb8f2002-12-23 02:00:23 +0000235 struct stat st;
Damien Miller95def091999-11-25 00:26:21 +1100236 char *cp;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000237 int i;
238 off_t len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000239
Ben Lindstrom44adb8f2002-12-23 02:00:23 +0000240 if (fstat(fd, &st) < 0) {
241 error("fstat for key file %.200s failed: %.100s",
242 filename, strerror(errno));
243 return NULL;
244 }
245 len = st.st_size;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000246
Damien Miller95def091999-11-25 00:26:21 +1100247 buffer_init(&buffer);
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100248 cp = buffer_append_space(&buffer, len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000249
Damien Miller037a0dc1999-12-07 15:38:31 +1100250 if (read(fd, cp, (size_t) len) != (size_t) len) {
Damien Miller95def091999-11-25 00:26:21 +1100251 debug("Read from key file %.200s failed: %.100s", filename,
Damien Millereba71ba2000-04-29 23:57:08 +1000252 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100253 buffer_free(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000254 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100255 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000256
Ben Lindstrom1170d712001-01-29 07:51:26 +0000257 /* Check that it is at least big enough to contain the ID string. */
258 if (len < sizeof(authfile_id_string)) {
Damien Miller058655c2001-10-10 15:03:36 +1000259 debug3("Not a RSA1 key file %.200s.", filename);
Damien Miller95def091999-11-25 00:26:21 +1100260 buffer_free(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000261 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100262 }
Damien Miller5428f641999-11-25 11:54:57 +1100263 /*
264 * Make sure it begins with the id string. Consume the id string
265 * from the buffer.
266 */
Ben Lindstrom1170d712001-01-29 07:51:26 +0000267 for (i = 0; i < sizeof(authfile_id_string); i++)
268 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
Damien Miller058655c2001-10-10 15:03:36 +1000269 debug3("Not a RSA1 key file %.200s.", filename);
Damien Miller95def091999-11-25 00:26:21 +1100270 buffer_free(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000271 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100272 }
273 /* Skip cipher type and reserved data. */
274 (void) buffer_get_char(&buffer); /* cipher type */
275 (void) buffer_get_int(&buffer); /* reserved */
276
277 /* Read the public key from the buffer. */
Ben Lindstromc5a7f4f2002-06-25 23:19:13 +0000278 (void) buffer_get_int(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000279 pub = key_new(KEY_RSA1);
280 buffer_get_bignum(&buffer, pub->rsa->n);
281 buffer_get_bignum(&buffer, pub->rsa->e);
282 if (commentp)
283 *commentp = buffer_get_string(&buffer, NULL);
Damien Miller95def091999-11-25 00:26:21 +1100284 /* The encrypted private part is not parsed by this function. */
285
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000286 buffer_free(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000287 return pub;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000288}
289
Ben Lindstromd0fca422001-03-26 13:44:06 +0000290/* load public key from private-key file, works only for SSH v1 */
291Key *
292key_load_public_type(int type, const char *filename, char **commentp)
Damien Millereba71ba2000-04-29 23:57:08 +1000293{
Ben Lindstromd0fca422001-03-26 13:44:06 +0000294 Key *pub;
295 int fd;
296
297 if (type == KEY_RSA1) {
298 fd = open(filename, O_RDONLY);
299 if (fd < 0)
300 return NULL;
301 pub = key_load_public_rsa1(fd, filename, commentp);
302 close(fd);
303 return pub;
Damien Millereba71ba2000-04-29 23:57:08 +1000304 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000305 return NULL;
Damien Millereba71ba2000-04-29 23:57:08 +1000306}
307
Damien Miller5428f641999-11-25 11:54:57 +1100308/*
309 * Loads the private key from the file. Returns 0 if an error is encountered
310 * (file does not exist or is not readable, or passphrase is bad). This
311 * initializes the private key.
312 * Assumes we are called under uid of the owner of the file.
313 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000314
Ben Lindstrombba81212001-06-25 05:01:22 +0000315static Key *
Ben Lindstromd0fca422001-03-26 13:44:06 +0000316key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
317 char **commentp)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000318{
Damien Millereba71ba2000-04-29 23:57:08 +1000319 int i, check1, check2, cipher_type;
Damien Miller95def091999-11-25 00:26:21 +1100320 off_t len;
321 Buffer buffer, decrypted;
Damien Miller708d21c2002-01-22 23:18:15 +1100322 u_char *cp;
Damien Miller874d77b2000-10-14 16:23:11 +1100323 CipherContext ciphercontext;
324 Cipher *cipher;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000325 Key *prv = NULL;
Ben Lindstrom44adb8f2002-12-23 02:00:23 +0000326 struct stat st;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000327
Ben Lindstrom44adb8f2002-12-23 02:00:23 +0000328 if (fstat(fd, &st) < 0) {
329 error("fstat for key file %.200s failed: %.100s",
330 filename, strerror(errno));
331 close(fd);
332 return NULL;
333 }
334 len = st.st_size;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000335
Damien Miller95def091999-11-25 00:26:21 +1100336 buffer_init(&buffer);
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100337 cp = buffer_append_space(&buffer, len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000338
Damien Miller037a0dc1999-12-07 15:38:31 +1100339 if (read(fd, cp, (size_t) len) != (size_t) len) {
Damien Miller95def091999-11-25 00:26:21 +1100340 debug("Read from key file %.200s failed: %.100s", filename,
Damien Miller0bc1bd82000-11-13 22:57:25 +1100341 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100342 buffer_free(&buffer);
Damien Miller037a0dc1999-12-07 15:38:31 +1100343 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000344 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100345 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000346
Ben Lindstrom1170d712001-01-29 07:51:26 +0000347 /* Check that it is at least big enough to contain the ID string. */
348 if (len < sizeof(authfile_id_string)) {
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 }
Damien Miller5428f641999-11-25 11:54:57 +1100354 /*
355 * Make sure it begins with the id string. Consume the id string
356 * from the buffer.
357 */
Ben Lindstrom1170d712001-01-29 07:51:26 +0000358 for (i = 0; i < sizeof(authfile_id_string); i++)
359 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
Damien Miller058655c2001-10-10 15:03:36 +1000360 debug3("Not a RSA1 key file %.200s.", filename);
Damien Miller95def091999-11-25 00:26:21 +1100361 buffer_free(&buffer);
Ben Lindstromb257cca2001-03-05 04:59:27 +0000362 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000363 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100364 }
Ben Lindstromb257cca2001-03-05 04:59:27 +0000365
Damien Miller95def091999-11-25 00:26:21 +1100366 /* Read cipher type. */
367 cipher_type = buffer_get_char(&buffer);
368 (void) buffer_get_int(&buffer); /* Reserved data. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000369
Damien Miller95def091999-11-25 00:26:21 +1100370 /* Read the public key from the buffer. */
Ben Lindstromc5a7f4f2002-06-25 23:19:13 +0000371 (void) buffer_get_int(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000372 prv = key_new_private(KEY_RSA1);
373
374 buffer_get_bignum(&buffer, prv->rsa->n);
375 buffer_get_bignum(&buffer, prv->rsa->e);
376 if (commentp)
377 *commentp = buffer_get_string(&buffer, NULL);
Damien Miller95def091999-11-25 00:26:21 +1100378 else
379 xfree(buffer_get_string(&buffer, NULL));
380
381 /* Check that it is a supported cipher. */
Damien Miller874d77b2000-10-14 16:23:11 +1100382 cipher = cipher_by_number(cipher_type);
383 if (cipher == NULL) {
384 debug("Unsupported cipher %d used in key file %.200s.",
385 cipher_type, filename);
Damien Miller95def091999-11-25 00:26:21 +1100386 buffer_free(&buffer);
387 goto fail;
388 }
389 /* Initialize space for decrypted data. */
390 buffer_init(&decrypted);
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100391 cp = buffer_append_space(&decrypted, buffer_len(&buffer));
Damien Miller95def091999-11-25 00:26:21 +1100392
393 /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
Damien Miller963f6b22002-02-19 15:21:23 +1100394 cipher_set_key_string(&ciphercontext, cipher, passphrase,
395 CIPHER_DECRYPT);
396 cipher_crypt(&ciphercontext, cp,
Damien Miller708d21c2002-01-22 23:18:15 +1100397 buffer_ptr(&buffer), buffer_len(&buffer));
Damien Miller963f6b22002-02-19 15:21:23 +1100398 cipher_cleanup(&ciphercontext);
Damien Miller874d77b2000-10-14 16:23:11 +1100399 memset(&ciphercontext, 0, sizeof(ciphercontext));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000400 buffer_free(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000401
Damien Miller95def091999-11-25 00:26:21 +1100402 check1 = buffer_get_char(&decrypted);
403 check2 = buffer_get_char(&decrypted);
404 if (check1 != buffer_get_char(&decrypted) ||
405 check2 != buffer_get_char(&decrypted)) {
406 if (strcmp(passphrase, "") != 0)
Ben Lindstromd0fca422001-03-26 13:44:06 +0000407 debug("Bad passphrase supplied for key file %.200s.",
408 filename);
Damien Miller95def091999-11-25 00:26:21 +1100409 /* Bad passphrase. */
410 buffer_free(&decrypted);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000411 goto fail;
Damien Miller95def091999-11-25 00:26:21 +1100412 }
413 /* Read the rest of the private key. */
Ben Lindstromd0fca422001-03-26 13:44:06 +0000414 buffer_get_bignum(&decrypted, prv->rsa->d);
415 buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
416 /* in SSL and SSH v1 p and q are exchanged */
417 buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
418 buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000419
Ben Lindstromd0fca422001-03-26 13:44:06 +0000420 /* calculate p-1 and q-1 */
Damien Millerda755162002-01-22 23:09:22 +1100421 rsa_generate_additional_parameters(prv->rsa);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000422
Damien Miller95def091999-11-25 00:26:21 +1100423 buffer_free(&decrypted);
Ben Lindstromb257cca2001-03-05 04:59:27 +0000424 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000425 return prv;
426
427fail:
428 if (commentp)
429 xfree(*commentp);
430 close(fd);
431 key_free(prv);
432 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000433}
Damien Millereba71ba2000-04-29 23:57:08 +1000434
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000435Key *
Ben Lindstromd0fca422001-03-26 13:44:06 +0000436key_load_private_pem(int fd, int type, const char *passphrase,
437 char **commentp)
Damien Millereba71ba2000-04-29 23:57:08 +1000438{
Damien Millereba71ba2000-04-29 23:57:08 +1000439 FILE *fp;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100440 EVP_PKEY *pk = NULL;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000441 Key *prv = NULL;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100442 char *name = "<no key>";
Damien Millereba71ba2000-04-29 23:57:08 +1000443
Damien Millereba71ba2000-04-29 23:57:08 +1000444 fp = fdopen(fd, "r");
445 if (fp == NULL) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000446 error("fdopen failed: %s", strerror(errno));
Ben Lindstromb257cca2001-03-05 04:59:27 +0000447 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000448 return NULL;
Damien Millereba71ba2000-04-29 23:57:08 +1000449 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100450 pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
451 if (pk == NULL) {
Ben Lindstrom648772f2001-04-19 20:47:10 +0000452 debug("PEM_read_PrivateKey failed");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100453 (void)ERR_get_error();
Ben Lindstromd0fca422001-03-26 13:44:06 +0000454 } else if (pk->type == EVP_PKEY_RSA &&
Damien Miller9f0f5c62001-12-21 14:45:46 +1100455 (type == KEY_UNSPEC||type==KEY_RSA)) {
Ben Lindstromd0fca422001-03-26 13:44:06 +0000456 prv = key_new(KEY_UNSPEC);
457 prv->rsa = EVP_PKEY_get1_RSA(pk);
458 prv->type = KEY_RSA;
459 name = "rsa w/o comment";
Damien Miller0bc1bd82000-11-13 22:57:25 +1100460#ifdef DEBUG_PK
Ben Lindstromd0fca422001-03-26 13:44:06 +0000461 RSA_print_fp(stderr, prv->rsa, 8);
Damien Millereba71ba2000-04-29 23:57:08 +1000462#endif
Ben Lindstromd0fca422001-03-26 13:44:06 +0000463 } else if (pk->type == EVP_PKEY_DSA &&
Damien Miller9f0f5c62001-12-21 14:45:46 +1100464 (type == KEY_UNSPEC||type==KEY_DSA)) {
Ben Lindstromd0fca422001-03-26 13:44:06 +0000465 prv = key_new(KEY_UNSPEC);
466 prv->dsa = EVP_PKEY_get1_DSA(pk);
467 prv->type = KEY_DSA;
468 name = "dsa w/o comment";
Damien Miller0bc1bd82000-11-13 22:57:25 +1100469#ifdef DEBUG_PK
Ben Lindstromd0fca422001-03-26 13:44:06 +0000470 DSA_print_fp(stderr, prv->dsa, 8);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100471#endif
Damien Miller0bc1bd82000-11-13 22:57:25 +1100472 } else {
473 error("PEM_read_PrivateKey: mismatch or "
474 "unknown EVP_PKEY save_type %d", pk->save_type);
475 }
476 fclose(fp);
477 if (pk != NULL)
478 EVP_PKEY_free(pk);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000479 if (prv != NULL && commentp)
480 *commentp = xstrdup(name);
481 debug("read PEM private key done: type %s",
482 prv ? key_type(prv) : "<unknown>");
483 return prv;
Damien Millereba71ba2000-04-29 23:57:08 +1000484}
485
Ben Lindstrombba81212001-06-25 05:01:22 +0000486static int
Ben Lindstromd0fca422001-03-26 13:44:06 +0000487key_perm_ok(int fd, const char *filename)
Damien Millereba71ba2000-04-29 23:57:08 +1000488{
Damien Millereba71ba2000-04-29 23:57:08 +1000489 struct stat st;
490
Ben Lindstrom7aff2612001-09-23 13:53:22 +0000491 if (fstat(fd, &st) < 0)
492 return 0;
493 /*
494 * if a key owned by the user is accessed, then we check the
495 * permissions of the file. if the key owned by a different user,
496 * then we don't care.
497 */
Damien Millerb70b61f2000-09-16 16:25:12 +1100498#ifdef HAVE_CYGWIN
Damien Millercb5e44a2000-09-29 12:12:36 +1100499 if (check_ntsec(filename))
Damien Millerb70b61f2000-09-16 16:25:12 +1100500#endif
Ben Lindstrom7aff2612001-09-23 13:53:22 +0000501 if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
Damien Millereba71ba2000-04-29 23:57:08 +1000502 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
503 error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
504 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
Ben Lindstrom7aff2612001-09-23 13:53:22 +0000505 error("Permissions 0%3.3o for '%s' are too open.",
Ben Lindstromb257cca2001-03-05 04:59:27 +0000506 st.st_mode & 0777, filename);
Damien Millereba71ba2000-04-29 23:57:08 +1000507 error("It is recommended that your private key files are NOT accessible by others.");
Ben Lindstromd0fca422001-03-26 13:44:06 +0000508 error("This private key will be ignored.");
Damien Millereba71ba2000-04-29 23:57:08 +1000509 return 0;
510 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000511 return 1;
512}
Ben Lindstromb257cca2001-03-05 04:59:27 +0000513
Ben Lindstromd0fca422001-03-26 13:44:06 +0000514Key *
515key_load_private_type(int type, const char *filename, const char *passphrase,
516 char **commentp)
517{
518 int fd;
519
520 fd = open(filename, O_RDONLY);
521 if (fd < 0)
522 return NULL;
523 if (!key_perm_ok(fd, filename)) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000524 error("bad permissions: ignore key: %s", filename);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000525 close(fd);
526 return NULL;
527 }
528 switch (type) {
529 case KEY_RSA1:
530 return key_load_private_rsa1(fd, filename, passphrase,
531 commentp);
532 /* closes fd */
Damien Millereba71ba2000-04-29 23:57:08 +1000533 break;
534 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100535 case KEY_RSA:
536 case KEY_UNSPEC:
Ben Lindstromd0fca422001-03-26 13:44:06 +0000537 return key_load_private_pem(fd, type, passphrase, commentp);
538 /* closes fd */
Ben Lindstromb257cca2001-03-05 04:59:27 +0000539 break;
Damien Millereba71ba2000-04-29 23:57:08 +1000540 default:
Ben Lindstromb257cca2001-03-05 04:59:27 +0000541 close(fd);
Damien Millereba71ba2000-04-29 23:57:08 +1000542 break;
543 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000544 return NULL;
545}
546
547Key *
548key_load_private(const char *filename, const char *passphrase,
549 char **commentp)
550{
Ben Lindstrom322915d2001-06-05 20:46:32 +0000551 Key *pub, *prv;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000552 int fd;
553
554 fd = open(filename, O_RDONLY);
555 if (fd < 0)
556 return NULL;
557 if (!key_perm_ok(fd, filename)) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000558 error("bad permissions: ignore key: %s", filename);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000559 close(fd);
560 return NULL;
561 }
562 pub = key_load_public_rsa1(fd, filename, commentp);
563 lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
564 if (pub == NULL) {
565 /* closes fd */
Ben Lindstrom322915d2001-06-05 20:46:32 +0000566 prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
567 /* use the filename as a comment for PEM */
568 if (commentp && prv)
Ben Lindstrom2d0356f2001-06-05 21:13:57 +0000569 *commentp = xstrdup(filename);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000570 } else {
571 /* it's a SSH v1 key if the public key part is readable */
572 key_free(pub);
573 /* closes fd */
Ben Lindstrom322915d2001-06-05 20:46:32 +0000574 prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000575 }
Ben Lindstrom322915d2001-06-05 20:46:32 +0000576 return prv;
Damien Millereba71ba2000-04-29 23:57:08 +1000577}
Damien Millere4340be2000-09-16 13:29:08 +1100578
Ben Lindstrombba81212001-06-25 05:01:22 +0000579static int
Ben Lindstromd0fca422001-03-26 13:44:06 +0000580key_try_load_public(Key *k, const char *filename, char **commentp)
Damien Millere4340be2000-09-16 13:29:08 +1100581{
582 FILE *f;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000583 char line[4096];
Damien Millere4340be2000-09-16 13:29:08 +1100584 char *cp;
585
586 f = fopen(filename, "r");
587 if (f != NULL) {
588 while (fgets(line, sizeof(line), f)) {
589 line[sizeof(line)-1] = '\0';
590 cp = line;
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000591 switch (*cp) {
Damien Millere4340be2000-09-16 13:29:08 +1100592 case '#':
593 case '\n':
594 case '\0':
595 continue;
596 }
597 /* Skip leading whitespace. */
598 for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
599 ;
600 if (*cp) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100601 if (key_read(k, &cp) == 1) {
Damien Millere4340be2000-09-16 13:29:08 +1100602 if (commentp)
603 *commentp=xstrdup(filename);
604 fclose(f);
605 return 1;
606 }
607 }
608 }
609 fclose(f);
610 }
611 return 0;
612}
613
Ben Lindstromd0fca422001-03-26 13:44:06 +0000614/* load public key from ssh v1 private or any pubkey file */
615Key *
616key_load_public(const char *filename, char **commentp)
Damien Millere4340be2000-09-16 13:29:08 +1100617{
Ben Lindstromd0fca422001-03-26 13:44:06 +0000618 Key *pub;
619 char file[MAXPATHLEN];
Damien Millere4340be2000-09-16 13:29:08 +1100620
Ben Lindstromd0fca422001-03-26 13:44:06 +0000621 pub = key_load_public_type(KEY_RSA1, filename, commentp);
622 if (pub != NULL)
623 return pub;
624 pub = key_new(KEY_UNSPEC);
625 if (key_try_load_public(pub, filename, commentp) == 1)
626 return pub;
627 if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
628 (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
629 (key_try_load_public(pub, file, commentp) == 1))
630 return pub;
631 key_free(pub);
632 return NULL;
Damien Millere4340be2000-09-16 13:29:08 +1100633}