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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"
Darren Tucker3f9fdc72004-06-22 12:56:01 +100039RCSID("$OpenBSD: authfile.c,v 1.57 2004/06/21 17:36:31 avsm 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;
Darren Tucker3f9fdc72004-06-22 12:56:01 +100075 u_int32_t rnd;
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. */
Darren Tucker3f9fdc72004-06-22 12:56:01 +100090 rnd = arc4random();
91 buf[0] = rnd & 0xff;
92 buf[1] = (rnd >> 8) & 0xff;
Damien Miller95def091999-11-25 00:26:21 +110093 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));
Darren Tuckerd1d41b32003-09-22 21:01:27 +1000146 buffer_free(&encrypted);
Damien Miller95def091999-11-25 00:26:21 +1100147 return 0;
Ben Lindstrom15f33862001-04-16 02:00:02 +0000148 }
Damien Miller037a0dc1999-12-07 15:38:31 +1100149 if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
Damien Miller95def091999-11-25 00:26:21 +1100150 buffer_len(&encrypted)) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000151 error("write to key file %s failed: %s", filename,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100152 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100153 buffer_free(&encrypted);
Damien Miller037a0dc1999-12-07 15:38:31 +1100154 close(fd);
Damien Miller78315eb2000-09-29 23:01:36 +1100155 unlink(filename);
Damien Miller95def091999-11-25 00:26:21 +1100156 return 0;
157 }
Damien Miller037a0dc1999-12-07 15:38:31 +1100158 close(fd);
Damien Miller95def091999-11-25 00:26:21 +1100159 buffer_free(&encrypted);
160 return 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000161}
162
Ben Lindstromd0fca422001-03-26 13:44:06 +0000163/* save SSH v2 key in OpenSSL PEM format */
Ben Lindstrombba81212001-06-25 05:01:22 +0000164static int
Ben Lindstromd0fca422001-03-26 13:44:06 +0000165key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
166 const char *comment)
Damien Millereba71ba2000-04-29 23:57:08 +1000167{
168 FILE *fp;
169 int fd;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100170 int success = 0;
171 int len = strlen(_passphrase);
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000172 u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
Ben Lindstrom80cb27d2002-03-05 01:33:36 +0000173 const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
Damien Millereba71ba2000-04-29 23:57:08 +1000174
175 if (len > 0 && len <= 4) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000176 error("passphrase too short: have %d bytes, need > 4", len);
Damien Millereba71ba2000-04-29 23:57:08 +1000177 return 0;
178 }
179 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
180 if (fd < 0) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000181 error("open %s failed: %s.", filename, strerror(errno));
Damien Millereba71ba2000-04-29 23:57:08 +1000182 return 0;
183 }
184 fp = fdopen(fd, "w");
185 if (fp == NULL ) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000186 error("fdopen %s failed: %s.", filename, strerror(errno));
Damien Millereba71ba2000-04-29 23:57:08 +1000187 close(fd);
188 return 0;
189 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100190 switch (key->type) {
Ben Lindstromc1116602001-03-29 00:28:37 +0000191 case KEY_DSA:
192 success = PEM_write_DSAPrivateKey(fp, key->dsa,
193 cipher, passphrase, len, NULL, NULL);
194 break;
195 case KEY_RSA:
196 success = PEM_write_RSAPrivateKey(fp, key->rsa,
197 cipher, passphrase, len, NULL, NULL);
198 break;
Damien Millereba71ba2000-04-29 23:57:08 +1000199 }
200 fclose(fp);
201 return success;
202}
203
204int
Ben Lindstromd0fca422001-03-26 13:44:06 +0000205key_save_private(Key *key, const char *filename, const char *passphrase,
Damien Millereba71ba2000-04-29 23:57:08 +1000206 const char *comment)
207{
208 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100209 case KEY_RSA1:
Ben Lindstromd0fca422001-03-26 13:44:06 +0000210 return key_save_private_rsa1(key, filename, passphrase,
211 comment);
Damien Millereba71ba2000-04-29 23:57:08 +1000212 break;
213 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100214 case KEY_RSA:
Ben Lindstromd0fca422001-03-26 13:44:06 +0000215 return key_save_private_pem(key, filename, passphrase,
216 comment);
Damien Millereba71ba2000-04-29 23:57:08 +1000217 break;
218 default:
219 break;
220 }
Ben Lindstrom15f33862001-04-16 02:00:02 +0000221 error("key_save_private: cannot save key type %d", key->type);
Damien Millereba71ba2000-04-29 23:57:08 +1000222 return 0;
223}
224
Damien Miller5428f641999-11-25 11:54:57 +1100225/*
Ben Lindstromd0fca422001-03-26 13:44:06 +0000226 * Loads the public part of the ssh v1 key file. Returns NULL if an error was
227 * encountered (the file does not exist or is not readable), and the key
Damien Miller5428f641999-11-25 11:54:57 +1100228 * otherwise.
229 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000230
Ben Lindstrombba81212001-06-25 05:01:22 +0000231static Key *
Ben Lindstromd0fca422001-03-26 13:44:06 +0000232key_load_public_rsa1(int fd, const char *filename, char **commentp)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000233{
Damien Miller95def091999-11-25 00:26:21 +1100234 Buffer buffer;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000235 Key *pub;
Ben Lindstrom44adb8f2002-12-23 02:00:23 +0000236 struct stat st;
Damien Miller95def091999-11-25 00:26:21 +1100237 char *cp;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000238 int i;
Darren Tucker1f8311c2004-05-13 16:39:33 +1000239 size_t len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000240
Ben Lindstrom44adb8f2002-12-23 02:00:23 +0000241 if (fstat(fd, &st) < 0) {
242 error("fstat for key file %.200s failed: %.100s",
243 filename, strerror(errno));
244 return NULL;
245 }
Darren Tucker1f8311c2004-05-13 16:39:33 +1000246 if (st.st_size > 1*1024*1024)
247 close(fd);
248 len = (size_t)st.st_size; /* truncated */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000249
Damien Miller95def091999-11-25 00:26:21 +1100250 buffer_init(&buffer);
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100251 cp = buffer_append_space(&buffer, len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000252
Damien Miller037a0dc1999-12-07 15:38:31 +1100253 if (read(fd, cp, (size_t) len) != (size_t) len) {
Damien Miller95def091999-11-25 00:26:21 +1100254 debug("Read from key file %.200s failed: %.100s", filename,
Damien Millereba71ba2000-04-29 23:57:08 +1000255 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100256 buffer_free(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000257 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100258 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000259
Ben Lindstrom1170d712001-01-29 07:51:26 +0000260 /* Check that it is at least big enough to contain the ID string. */
261 if (len < sizeof(authfile_id_string)) {
Damien Miller058655c2001-10-10 15:03:36 +1000262 debug3("Not a RSA1 key file %.200s.", filename);
Damien Miller95def091999-11-25 00:26:21 +1100263 buffer_free(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000264 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100265 }
Damien Miller5428f641999-11-25 11:54:57 +1100266 /*
267 * Make sure it begins with the id string. Consume the id string
268 * from the buffer.
269 */
Ben Lindstrom1170d712001-01-29 07:51:26 +0000270 for (i = 0; i < sizeof(authfile_id_string); i++)
271 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
Damien Miller058655c2001-10-10 15:03:36 +1000272 debug3("Not a RSA1 key file %.200s.", filename);
Damien Miller95def091999-11-25 00:26:21 +1100273 buffer_free(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000274 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100275 }
276 /* Skip cipher type and reserved data. */
277 (void) buffer_get_char(&buffer); /* cipher type */
278 (void) buffer_get_int(&buffer); /* reserved */
279
280 /* Read the public key from the buffer. */
Ben Lindstromc5a7f4f2002-06-25 23:19:13 +0000281 (void) buffer_get_int(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000282 pub = key_new(KEY_RSA1);
283 buffer_get_bignum(&buffer, pub->rsa->n);
284 buffer_get_bignum(&buffer, pub->rsa->e);
285 if (commentp)
286 *commentp = buffer_get_string(&buffer, NULL);
Damien Miller95def091999-11-25 00:26:21 +1100287 /* The encrypted private part is not parsed by this function. */
288
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000289 buffer_free(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000290 return pub;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000291}
292
Ben Lindstromd0fca422001-03-26 13:44:06 +0000293/* load public key from private-key file, works only for SSH v1 */
294Key *
295key_load_public_type(int type, const char *filename, char **commentp)
Damien Millereba71ba2000-04-29 23:57:08 +1000296{
Ben Lindstromd0fca422001-03-26 13:44:06 +0000297 Key *pub;
298 int fd;
299
300 if (type == KEY_RSA1) {
301 fd = open(filename, O_RDONLY);
302 if (fd < 0)
303 return NULL;
304 pub = key_load_public_rsa1(fd, filename, commentp);
305 close(fd);
306 return pub;
Damien Millereba71ba2000-04-29 23:57:08 +1000307 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000308 return NULL;
Damien Millereba71ba2000-04-29 23:57:08 +1000309}
310
Damien Miller5428f641999-11-25 11:54:57 +1100311/*
312 * Loads the private key from the file. Returns 0 if an error is encountered
313 * (file does not exist or is not readable, or passphrase is bad). This
314 * initializes the private key.
315 * Assumes we are called under uid of the owner of the file.
316 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000317
Ben Lindstrombba81212001-06-25 05:01:22 +0000318static Key *
Ben Lindstromd0fca422001-03-26 13:44:06 +0000319key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
320 char **commentp)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000321{
Damien Millereba71ba2000-04-29 23:57:08 +1000322 int i, check1, check2, cipher_type;
Darren Tucker1f8311c2004-05-13 16:39:33 +1000323 size_t len;
Damien Miller95def091999-11-25 00:26:21 +1100324 Buffer buffer, decrypted;
Damien Miller708d21c2002-01-22 23:18:15 +1100325 u_char *cp;
Damien Miller874d77b2000-10-14 16:23:11 +1100326 CipherContext ciphercontext;
327 Cipher *cipher;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000328 Key *prv = NULL;
Ben Lindstrom44adb8f2002-12-23 02:00:23 +0000329 struct stat st;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000330
Ben Lindstrom44adb8f2002-12-23 02:00:23 +0000331 if (fstat(fd, &st) < 0) {
332 error("fstat for key file %.200s failed: %.100s",
333 filename, strerror(errno));
334 close(fd);
335 return NULL;
336 }
Darren Tucker1f8311c2004-05-13 16:39:33 +1000337 if (st.st_size > 1*1024*1024) {
338 close(fd);
339 return (NULL);
340 }
341 len = (size_t)st.st_size; /* truncated */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000342
Damien Miller95def091999-11-25 00:26:21 +1100343 buffer_init(&buffer);
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100344 cp = buffer_append_space(&buffer, len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000345
Damien Miller037a0dc1999-12-07 15:38:31 +1100346 if (read(fd, cp, (size_t) len) != (size_t) len) {
Damien Miller95def091999-11-25 00:26:21 +1100347 debug("Read from key file %.200s failed: %.100s", filename,
Damien Miller0bc1bd82000-11-13 22:57:25 +1100348 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100349 buffer_free(&buffer);
Damien Miller037a0dc1999-12-07 15:38:31 +1100350 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000351 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100352 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000353
Ben Lindstrom1170d712001-01-29 07:51:26 +0000354 /* Check that it is at least big enough to contain the ID string. */
355 if (len < sizeof(authfile_id_string)) {
Damien Miller058655c2001-10-10 15:03:36 +1000356 debug3("Not a RSA1 key file %.200s.", filename);
Damien Miller95def091999-11-25 00:26:21 +1100357 buffer_free(&buffer);
Ben Lindstromb257cca2001-03-05 04:59:27 +0000358 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000359 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100360 }
Damien Miller5428f641999-11-25 11:54:57 +1100361 /*
362 * Make sure it begins with the id string. Consume the id string
363 * from the buffer.
364 */
Ben Lindstrom1170d712001-01-29 07:51:26 +0000365 for (i = 0; i < sizeof(authfile_id_string); i++)
366 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
Damien Miller058655c2001-10-10 15:03:36 +1000367 debug3("Not a RSA1 key file %.200s.", filename);
Damien Miller95def091999-11-25 00:26:21 +1100368 buffer_free(&buffer);
Ben Lindstromb257cca2001-03-05 04:59:27 +0000369 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000370 return NULL;
Damien Miller95def091999-11-25 00:26:21 +1100371 }
Ben Lindstromb257cca2001-03-05 04:59:27 +0000372
Damien Miller95def091999-11-25 00:26:21 +1100373 /* Read cipher type. */
374 cipher_type = buffer_get_char(&buffer);
375 (void) buffer_get_int(&buffer); /* Reserved data. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000376
Damien Miller95def091999-11-25 00:26:21 +1100377 /* Read the public key from the buffer. */
Ben Lindstromc5a7f4f2002-06-25 23:19:13 +0000378 (void) buffer_get_int(&buffer);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000379 prv = key_new_private(KEY_RSA1);
380
381 buffer_get_bignum(&buffer, prv->rsa->n);
382 buffer_get_bignum(&buffer, prv->rsa->e);
383 if (commentp)
384 *commentp = buffer_get_string(&buffer, NULL);
Damien Miller95def091999-11-25 00:26:21 +1100385 else
386 xfree(buffer_get_string(&buffer, NULL));
387
388 /* Check that it is a supported cipher. */
Damien Miller874d77b2000-10-14 16:23:11 +1100389 cipher = cipher_by_number(cipher_type);
390 if (cipher == NULL) {
391 debug("Unsupported cipher %d used in key file %.200s.",
392 cipher_type, filename);
Damien Miller95def091999-11-25 00:26:21 +1100393 buffer_free(&buffer);
394 goto fail;
395 }
396 /* Initialize space for decrypted data. */
397 buffer_init(&decrypted);
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100398 cp = buffer_append_space(&decrypted, buffer_len(&buffer));
Damien Miller95def091999-11-25 00:26:21 +1100399
400 /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
Damien Miller963f6b22002-02-19 15:21:23 +1100401 cipher_set_key_string(&ciphercontext, cipher, passphrase,
402 CIPHER_DECRYPT);
403 cipher_crypt(&ciphercontext, cp,
Damien Miller708d21c2002-01-22 23:18:15 +1100404 buffer_ptr(&buffer), buffer_len(&buffer));
Damien Miller963f6b22002-02-19 15:21:23 +1100405 cipher_cleanup(&ciphercontext);
Damien Miller874d77b2000-10-14 16:23:11 +1100406 memset(&ciphercontext, 0, sizeof(ciphercontext));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000407 buffer_free(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000408
Damien Miller95def091999-11-25 00:26:21 +1100409 check1 = buffer_get_char(&decrypted);
410 check2 = buffer_get_char(&decrypted);
411 if (check1 != buffer_get_char(&decrypted) ||
412 check2 != buffer_get_char(&decrypted)) {
413 if (strcmp(passphrase, "") != 0)
Ben Lindstromd0fca422001-03-26 13:44:06 +0000414 debug("Bad passphrase supplied for key file %.200s.",
415 filename);
Damien Miller95def091999-11-25 00:26:21 +1100416 /* Bad passphrase. */
417 buffer_free(&decrypted);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000418 goto fail;
Damien Miller95def091999-11-25 00:26:21 +1100419 }
420 /* Read the rest of the private key. */
Ben Lindstromd0fca422001-03-26 13:44:06 +0000421 buffer_get_bignum(&decrypted, prv->rsa->d);
422 buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
423 /* in SSL and SSH v1 p and q are exchanged */
424 buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
425 buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000426
Ben Lindstromd0fca422001-03-26 13:44:06 +0000427 /* calculate p-1 and q-1 */
Damien Millerda755162002-01-22 23:09:22 +1100428 rsa_generate_additional_parameters(prv->rsa);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000429
Damien Miller95def091999-11-25 00:26:21 +1100430 buffer_free(&decrypted);
Damien Millered33d3b2003-03-15 11:36:18 +1100431
432 /* enable blinding */
433 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
434 error("key_load_private_rsa1: RSA_blinding_on failed");
435 goto fail;
436 }
Ben Lindstromb257cca2001-03-05 04:59:27 +0000437 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000438 return prv;
439
440fail:
441 if (commentp)
442 xfree(*commentp);
443 close(fd);
444 key_free(prv);
445 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000446}
Damien Millereba71ba2000-04-29 23:57:08 +1000447
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000448Key *
Ben Lindstromd0fca422001-03-26 13:44:06 +0000449key_load_private_pem(int fd, int type, const char *passphrase,
450 char **commentp)
Damien Millereba71ba2000-04-29 23:57:08 +1000451{
Damien Millereba71ba2000-04-29 23:57:08 +1000452 FILE *fp;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100453 EVP_PKEY *pk = NULL;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000454 Key *prv = NULL;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100455 char *name = "<no key>";
Damien Millereba71ba2000-04-29 23:57:08 +1000456
Damien Millereba71ba2000-04-29 23:57:08 +1000457 fp = fdopen(fd, "r");
458 if (fp == NULL) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000459 error("fdopen failed: %s", strerror(errno));
Ben Lindstromb257cca2001-03-05 04:59:27 +0000460 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000461 return NULL;
Damien Millereba71ba2000-04-29 23:57:08 +1000462 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100463 pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
464 if (pk == NULL) {
Ben Lindstrom648772f2001-04-19 20:47:10 +0000465 debug("PEM_read_PrivateKey failed");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100466 (void)ERR_get_error();
Ben Lindstromd0fca422001-03-26 13:44:06 +0000467 } else if (pk->type == EVP_PKEY_RSA &&
Damien Miller9f0f5c62001-12-21 14:45:46 +1100468 (type == KEY_UNSPEC||type==KEY_RSA)) {
Ben Lindstromd0fca422001-03-26 13:44:06 +0000469 prv = key_new(KEY_UNSPEC);
470 prv->rsa = EVP_PKEY_get1_RSA(pk);
471 prv->type = KEY_RSA;
472 name = "rsa w/o comment";
Damien Miller0bc1bd82000-11-13 22:57:25 +1100473#ifdef DEBUG_PK
Ben Lindstromd0fca422001-03-26 13:44:06 +0000474 RSA_print_fp(stderr, prv->rsa, 8);
Damien Millereba71ba2000-04-29 23:57:08 +1000475#endif
Damien Millered33d3b2003-03-15 11:36:18 +1100476 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
477 error("key_load_private_pem: RSA_blinding_on failed");
478 key_free(prv);
479 prv = NULL;
480 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000481 } else if (pk->type == EVP_PKEY_DSA &&
Damien Miller9f0f5c62001-12-21 14:45:46 +1100482 (type == KEY_UNSPEC||type==KEY_DSA)) {
Ben Lindstromd0fca422001-03-26 13:44:06 +0000483 prv = key_new(KEY_UNSPEC);
484 prv->dsa = EVP_PKEY_get1_DSA(pk);
485 prv->type = KEY_DSA;
486 name = "dsa w/o comment";
Damien Miller0bc1bd82000-11-13 22:57:25 +1100487#ifdef DEBUG_PK
Ben Lindstromd0fca422001-03-26 13:44:06 +0000488 DSA_print_fp(stderr, prv->dsa, 8);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100489#endif
Damien Miller0bc1bd82000-11-13 22:57:25 +1100490 } else {
491 error("PEM_read_PrivateKey: mismatch or "
492 "unknown EVP_PKEY save_type %d", pk->save_type);
493 }
494 fclose(fp);
495 if (pk != NULL)
496 EVP_PKEY_free(pk);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000497 if (prv != NULL && commentp)
498 *commentp = xstrdup(name);
499 debug("read PEM private key done: type %s",
500 prv ? key_type(prv) : "<unknown>");
501 return prv;
Damien Millereba71ba2000-04-29 23:57:08 +1000502}
503
Ben Lindstrombba81212001-06-25 05:01:22 +0000504static int
Ben Lindstromd0fca422001-03-26 13:44:06 +0000505key_perm_ok(int fd, const char *filename)
Damien Millereba71ba2000-04-29 23:57:08 +1000506{
Damien Millereba71ba2000-04-29 23:57:08 +1000507 struct stat st;
508
Ben Lindstrom7aff2612001-09-23 13:53:22 +0000509 if (fstat(fd, &st) < 0)
510 return 0;
511 /*
512 * if a key owned by the user is accessed, then we check the
513 * permissions of the file. if the key owned by a different user,
514 * then we don't care.
515 */
Damien Millerb70b61f2000-09-16 16:25:12 +1100516#ifdef HAVE_CYGWIN
Damien Millercb5e44a2000-09-29 12:12:36 +1100517 if (check_ntsec(filename))
Damien Millerb70b61f2000-09-16 16:25:12 +1100518#endif
Ben Lindstrom7aff2612001-09-23 13:53:22 +0000519 if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
Damien Millereba71ba2000-04-29 23:57:08 +1000520 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
521 error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
522 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
Ben Lindstrom7aff2612001-09-23 13:53:22 +0000523 error("Permissions 0%3.3o for '%s' are too open.",
Damien Miller04bd8b02003-05-25 14:38:33 +1000524 (u_int)st.st_mode & 0777, filename);
Damien Millereba71ba2000-04-29 23:57:08 +1000525 error("It is recommended that your private key files are NOT accessible by others.");
Ben Lindstromd0fca422001-03-26 13:44:06 +0000526 error("This private key will be ignored.");
Damien Millereba71ba2000-04-29 23:57:08 +1000527 return 0;
528 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000529 return 1;
530}
Ben Lindstromb257cca2001-03-05 04:59:27 +0000531
Ben Lindstromd0fca422001-03-26 13:44:06 +0000532Key *
533key_load_private_type(int type, const char *filename, const char *passphrase,
534 char **commentp)
535{
536 int fd;
537
538 fd = open(filename, O_RDONLY);
539 if (fd < 0)
540 return NULL;
541 if (!key_perm_ok(fd, filename)) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000542 error("bad permissions: ignore key: %s", filename);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000543 close(fd);
544 return NULL;
545 }
546 switch (type) {
547 case KEY_RSA1:
548 return key_load_private_rsa1(fd, filename, passphrase,
549 commentp);
550 /* closes fd */
Damien Millereba71ba2000-04-29 23:57:08 +1000551 break;
552 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100553 case KEY_RSA:
554 case KEY_UNSPEC:
Ben Lindstromd0fca422001-03-26 13:44:06 +0000555 return key_load_private_pem(fd, type, passphrase, commentp);
556 /* closes fd */
Ben Lindstromb257cca2001-03-05 04:59:27 +0000557 break;
Damien Millereba71ba2000-04-29 23:57:08 +1000558 default:
Ben Lindstromb257cca2001-03-05 04:59:27 +0000559 close(fd);
Damien Millereba71ba2000-04-29 23:57:08 +1000560 break;
561 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000562 return NULL;
563}
564
565Key *
566key_load_private(const char *filename, const char *passphrase,
567 char **commentp)
568{
Ben Lindstrom322915d2001-06-05 20:46:32 +0000569 Key *pub, *prv;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000570 int fd;
571
572 fd = open(filename, O_RDONLY);
573 if (fd < 0)
574 return NULL;
575 if (!key_perm_ok(fd, filename)) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000576 error("bad permissions: ignore key: %s", filename);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000577 close(fd);
578 return NULL;
579 }
580 pub = key_load_public_rsa1(fd, filename, commentp);
581 lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
582 if (pub == NULL) {
583 /* closes fd */
Ben Lindstrom322915d2001-06-05 20:46:32 +0000584 prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
585 /* use the filename as a comment for PEM */
586 if (commentp && prv)
Ben Lindstrom2d0356f2001-06-05 21:13:57 +0000587 *commentp = xstrdup(filename);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000588 } else {
589 /* it's a SSH v1 key if the public key part is readable */
590 key_free(pub);
591 /* closes fd */
Ben Lindstrom322915d2001-06-05 20:46:32 +0000592 prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000593 }
Ben Lindstrom322915d2001-06-05 20:46:32 +0000594 return prv;
Damien Millereba71ba2000-04-29 23:57:08 +1000595}
Damien Millere4340be2000-09-16 13:29:08 +1100596
Ben Lindstrombba81212001-06-25 05:01:22 +0000597static int
Ben Lindstromd0fca422001-03-26 13:44:06 +0000598key_try_load_public(Key *k, const char *filename, char **commentp)
Damien Millere4340be2000-09-16 13:29:08 +1100599{
600 FILE *f;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000601 char line[4096];
Damien Millere4340be2000-09-16 13:29:08 +1100602 char *cp;
603
604 f = fopen(filename, "r");
605 if (f != NULL) {
606 while (fgets(line, sizeof(line), f)) {
607 line[sizeof(line)-1] = '\0';
608 cp = line;
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000609 switch (*cp) {
Damien Millere4340be2000-09-16 13:29:08 +1100610 case '#':
611 case '\n':
612 case '\0':
613 continue;
614 }
615 /* Skip leading whitespace. */
616 for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
617 ;
618 if (*cp) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100619 if (key_read(k, &cp) == 1) {
Damien Millere4340be2000-09-16 13:29:08 +1100620 if (commentp)
621 *commentp=xstrdup(filename);
622 fclose(f);
623 return 1;
624 }
625 }
626 }
627 fclose(f);
628 }
629 return 0;
630}
631
Ben Lindstromd0fca422001-03-26 13:44:06 +0000632/* load public key from ssh v1 private or any pubkey file */
633Key *
634key_load_public(const char *filename, char **commentp)
Damien Millere4340be2000-09-16 13:29:08 +1100635{
Ben Lindstromd0fca422001-03-26 13:44:06 +0000636 Key *pub;
637 char file[MAXPATHLEN];
Damien Millere4340be2000-09-16 13:29:08 +1100638
Damien Millerdb274722003-05-14 13:45:22 +1000639 /* try rsa1 private key */
Ben Lindstromd0fca422001-03-26 13:44:06 +0000640 pub = key_load_public_type(KEY_RSA1, filename, commentp);
641 if (pub != NULL)
642 return pub;
Damien Millerdb274722003-05-14 13:45:22 +1000643
644 /* try rsa1 public key */
645 pub = key_new(KEY_RSA1);
646 if (key_try_load_public(pub, filename, commentp) == 1)
647 return pub;
648 key_free(pub);
649
650 /* try ssh2 public key */
Ben Lindstromd0fca422001-03-26 13:44:06 +0000651 pub = key_new(KEY_UNSPEC);
652 if (key_try_load_public(pub, filename, commentp) == 1)
653 return pub;
654 if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
655 (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
656 (key_try_load_public(pub, file, commentp) == 1))
657 return pub;
658 key_free(pub);
659 return NULL;
Damien Millere4340be2000-09-16 13:29:08 +1100660}