blob: 69e0da03b7b5fac2a8b2b66067ae9fc82730aba3 [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11003 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * This file contains functions for reading and writing identity files, and
6 * for reading the passphrase from the user.
Damien Miller4af51302000-04-16 11:18:38 +10007 *
Damien Millere4340be2000-09-16 13:29:08 +11008 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
13 *
14 *
15 * Copyright (c) 2000 Markus Friedl. All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110036 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100037
38#include "includes.h"
Damien Miller708d21c2002-01-22 23:18:15 +110039RCSID("$OpenBSD: authfile.c,v 1.45 2001/12/29 21:56:01 stevesk 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 Miller037a0dc1999-12-07 15:38:31 +110072 int fd, i;
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 Miller95def091999-11-25 00:26:21 +110081 if (strcmp(passphrase, "") == 0)
Damien Miller874d77b2000-10-14 16:23:11 +110082 cipher = cipher_by_number(SSH_CIPHER_NONE);
Damien Miller95def091999-11-25 00:26:21 +110083 else
Damien Miller874d77b2000-10-14 16:23:11 +110084 cipher = cipher_by_number(SSH_AUTHFILE_CIPHER);
85 if (cipher == NULL)
86 fatal("save_private_key_rsa: bad cipher");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100087
Damien Miller95def091999-11-25 00:26:21 +110088 /* This buffer is used to built the secret part of the private key. */
89 buffer_init(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100090
Damien Miller95def091999-11-25 00:26:21 +110091 /* Put checkbytes for checking passphrase validity. */
92 rand = arc4random();
93 buf[0] = rand & 0xff;
94 buf[1] = (rand >> 8) & 0xff;
95 buf[2] = buf[0];
96 buf[3] = buf[1];
97 buffer_append(&buffer, buf, 4);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100098
Damien Miller5428f641999-11-25 11:54:57 +110099 /*
100 * Store the private key (n and e will not be stored because they
101 * will be stored in plain text, and storing them also in encrypted
102 * format would just give known plaintext).
103 */
Ben Lindstromd0fca422001-03-26 13:44:06 +0000104 buffer_put_bignum(&buffer, key->rsa->d);
105 buffer_put_bignum(&buffer, key->rsa->iqmp);
106 buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
107 buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000108
Damien Miller95def091999-11-25 00:26:21 +1100109 /* Pad the part to be encrypted until its size is a multiple of 8. */
110 while (buffer_len(&buffer) % 8 != 0)
111 buffer_put_char(&buffer, 0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000112
Damien Miller95def091999-11-25 00:26:21 +1100113 /* This buffer will be used to contain the data in the file. */
114 buffer_init(&encrypted);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000115
Damien Miller95def091999-11-25 00:26:21 +1100116 /* First store keyfile id string. */
Ben Lindstrom1170d712001-01-29 07:51:26 +0000117 for (i = 0; authfile_id_string[i]; i++)
118 buffer_put_char(&encrypted, authfile_id_string[i]);
Damien Miller95def091999-11-25 00:26:21 +1100119 buffer_put_char(&encrypted, 0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000120
Damien Miller95def091999-11-25 00:26:21 +1100121 /* Store cipher type. */
Damien Miller874d77b2000-10-14 16:23:11 +1100122 buffer_put_char(&encrypted, cipher->number);
Damien Miller95def091999-11-25 00:26:21 +1100123 buffer_put_int(&encrypted, 0); /* For future extension */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000124
Damien Miller95def091999-11-25 00:26:21 +1100125 /* Store public key. This will be in plain text. */
Ben Lindstromd0fca422001-03-26 13:44:06 +0000126 buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
127 buffer_put_bignum(&encrypted, key->rsa->n);
128 buffer_put_bignum(&encrypted, key->rsa->e);
Ben Lindstrom664408d2001-06-09 01:42:01 +0000129 buffer_put_cstring(&encrypted, comment);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000130
Damien Miller95def091999-11-25 00:26:21 +1100131 /* Allocate space for the private part of the key in the buffer. */
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100132 cp = buffer_append_space(&encrypted, buffer_len(&buffer));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000133
Damien Miller874d77b2000-10-14 16:23:11 +1100134 cipher_set_key_string(&ciphercontext, cipher, passphrase);
Damien Miller708d21c2002-01-22 23:18:15 +1100135 cipher_encrypt(&ciphercontext, cp,
136 buffer_ptr(&buffer), buffer_len(&buffer));
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);
171 char *passphrase = (len > 0) ? (char *)_passphrase : NULL;
172 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. */
273 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. */
360 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 Miller874d77b2000-10-14 16:23:11 +1100383 cipher_set_key_string(&ciphercontext, cipher, passphrase);
Damien Miller708d21c2002-01-22 23:18:15 +1100384 cipher_decrypt(&ciphercontext, cp,
385 buffer_ptr(&buffer), buffer_len(&buffer));
Damien Miller874d77b2000-10-14 16:23:11 +1100386 memset(&ciphercontext, 0, sizeof(ciphercontext));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000387 buffer_free(&buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000388
Damien Miller95def091999-11-25 00:26:21 +1100389 check1 = buffer_get_char(&decrypted);
390 check2 = buffer_get_char(&decrypted);
391 if (check1 != buffer_get_char(&decrypted) ||
392 check2 != buffer_get_char(&decrypted)) {
393 if (strcmp(passphrase, "") != 0)
Ben Lindstromd0fca422001-03-26 13:44:06 +0000394 debug("Bad passphrase supplied for key file %.200s.",
395 filename);
Damien Miller95def091999-11-25 00:26:21 +1100396 /* Bad passphrase. */
397 buffer_free(&decrypted);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000398 goto fail;
Damien Miller95def091999-11-25 00:26:21 +1100399 }
400 /* Read the rest of the private key. */
Ben Lindstromd0fca422001-03-26 13:44:06 +0000401 buffer_get_bignum(&decrypted, prv->rsa->d);
402 buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
403 /* in SSL and SSH v1 p and q are exchanged */
404 buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
405 buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000406
Ben Lindstromd0fca422001-03-26 13:44:06 +0000407 /* calculate p-1 and q-1 */
Damien Millerda755162002-01-22 23:09:22 +1100408 rsa_generate_additional_parameters(prv->rsa);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000409
Damien Miller95def091999-11-25 00:26:21 +1100410 buffer_free(&decrypted);
Ben Lindstromb257cca2001-03-05 04:59:27 +0000411 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000412 return prv;
413
414fail:
415 if (commentp)
416 xfree(*commentp);
417 close(fd);
418 key_free(prv);
419 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000420}
Damien Millereba71ba2000-04-29 23:57:08 +1000421
Ben Lindstrombba81212001-06-25 05:01:22 +0000422static Key *
Ben Lindstromd0fca422001-03-26 13:44:06 +0000423key_load_private_pem(int fd, int type, const char *passphrase,
424 char **commentp)
Damien Millereba71ba2000-04-29 23:57:08 +1000425{
Damien Millereba71ba2000-04-29 23:57:08 +1000426 FILE *fp;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100427 EVP_PKEY *pk = NULL;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000428 Key *prv = NULL;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100429 char *name = "<no key>";
Damien Millereba71ba2000-04-29 23:57:08 +1000430
Damien Millereba71ba2000-04-29 23:57:08 +1000431 fp = fdopen(fd, "r");
432 if (fp == NULL) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000433 error("fdopen failed: %s", strerror(errno));
Ben Lindstromb257cca2001-03-05 04:59:27 +0000434 close(fd);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000435 return NULL;
Damien Millereba71ba2000-04-29 23:57:08 +1000436 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100437 pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
438 if (pk == NULL) {
Ben Lindstrom648772f2001-04-19 20:47:10 +0000439 debug("PEM_read_PrivateKey failed");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100440 (void)ERR_get_error();
Ben Lindstromd0fca422001-03-26 13:44:06 +0000441 } else if (pk->type == EVP_PKEY_RSA &&
Damien Miller9f0f5c62001-12-21 14:45:46 +1100442 (type == KEY_UNSPEC||type==KEY_RSA)) {
Ben Lindstromd0fca422001-03-26 13:44:06 +0000443 prv = key_new(KEY_UNSPEC);
444 prv->rsa = EVP_PKEY_get1_RSA(pk);
445 prv->type = KEY_RSA;
446 name = "rsa w/o comment";
Damien Miller0bc1bd82000-11-13 22:57:25 +1100447#ifdef DEBUG_PK
Ben Lindstromd0fca422001-03-26 13:44:06 +0000448 RSA_print_fp(stderr, prv->rsa, 8);
Damien Millereba71ba2000-04-29 23:57:08 +1000449#endif
Ben Lindstromd0fca422001-03-26 13:44:06 +0000450 } else if (pk->type == EVP_PKEY_DSA &&
Damien Miller9f0f5c62001-12-21 14:45:46 +1100451 (type == KEY_UNSPEC||type==KEY_DSA)) {
Ben Lindstromd0fca422001-03-26 13:44:06 +0000452 prv = key_new(KEY_UNSPEC);
453 prv->dsa = EVP_PKEY_get1_DSA(pk);
454 prv->type = KEY_DSA;
455 name = "dsa w/o comment";
Damien Miller0bc1bd82000-11-13 22:57:25 +1100456#ifdef DEBUG_PK
Ben Lindstromd0fca422001-03-26 13:44:06 +0000457 DSA_print_fp(stderr, prv->dsa, 8);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100458#endif
Damien Miller0bc1bd82000-11-13 22:57:25 +1100459 } else {
460 error("PEM_read_PrivateKey: mismatch or "
461 "unknown EVP_PKEY save_type %d", pk->save_type);
462 }
463 fclose(fp);
464 if (pk != NULL)
465 EVP_PKEY_free(pk);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000466 if (prv != NULL && commentp)
467 *commentp = xstrdup(name);
468 debug("read PEM private key done: type %s",
469 prv ? key_type(prv) : "<unknown>");
470 return prv;
Damien Millereba71ba2000-04-29 23:57:08 +1000471}
472
Ben Lindstrombba81212001-06-25 05:01:22 +0000473static int
Ben Lindstromd0fca422001-03-26 13:44:06 +0000474key_perm_ok(int fd, const char *filename)
Damien Millereba71ba2000-04-29 23:57:08 +1000475{
Damien Millereba71ba2000-04-29 23:57:08 +1000476 struct stat st;
477
Ben Lindstrom7aff2612001-09-23 13:53:22 +0000478 if (fstat(fd, &st) < 0)
479 return 0;
480 /*
481 * if a key owned by the user is accessed, then we check the
482 * permissions of the file. if the key owned by a different user,
483 * then we don't care.
484 */
Damien Millerb70b61f2000-09-16 16:25:12 +1100485#ifdef HAVE_CYGWIN
Damien Millercb5e44a2000-09-29 12:12:36 +1100486 if (check_ntsec(filename))
Damien Millerb70b61f2000-09-16 16:25:12 +1100487#endif
Ben Lindstrom7aff2612001-09-23 13:53:22 +0000488 if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
Damien Millereba71ba2000-04-29 23:57:08 +1000489 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
490 error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
491 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
Ben Lindstrom7aff2612001-09-23 13:53:22 +0000492 error("Permissions 0%3.3o for '%s' are too open.",
Ben Lindstromb257cca2001-03-05 04:59:27 +0000493 st.st_mode & 0777, filename);
Damien Millereba71ba2000-04-29 23:57:08 +1000494 error("It is recommended that your private key files are NOT accessible by others.");
Ben Lindstromd0fca422001-03-26 13:44:06 +0000495 error("This private key will be ignored.");
Damien Millereba71ba2000-04-29 23:57:08 +1000496 return 0;
497 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000498 return 1;
499}
Ben Lindstromb257cca2001-03-05 04:59:27 +0000500
Ben Lindstromd0fca422001-03-26 13:44:06 +0000501Key *
502key_load_private_type(int type, const char *filename, const char *passphrase,
503 char **commentp)
504{
505 int fd;
506
507 fd = open(filename, O_RDONLY);
508 if (fd < 0)
509 return NULL;
510 if (!key_perm_ok(fd, filename)) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000511 error("bad permissions: ignore key: %s", filename);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000512 close(fd);
513 return NULL;
514 }
515 switch (type) {
516 case KEY_RSA1:
517 return key_load_private_rsa1(fd, filename, passphrase,
518 commentp);
519 /* closes fd */
Damien Millereba71ba2000-04-29 23:57:08 +1000520 break;
521 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100522 case KEY_RSA:
523 case KEY_UNSPEC:
Ben Lindstromd0fca422001-03-26 13:44:06 +0000524 return key_load_private_pem(fd, type, passphrase, commentp);
525 /* closes fd */
Ben Lindstromb257cca2001-03-05 04:59:27 +0000526 break;
Damien Millereba71ba2000-04-29 23:57:08 +1000527 default:
Ben Lindstromb257cca2001-03-05 04:59:27 +0000528 close(fd);
Damien Millereba71ba2000-04-29 23:57:08 +1000529 break;
530 }
Ben Lindstromd0fca422001-03-26 13:44:06 +0000531 return NULL;
532}
533
534Key *
535key_load_private(const char *filename, const char *passphrase,
536 char **commentp)
537{
Ben Lindstrom322915d2001-06-05 20:46:32 +0000538 Key *pub, *prv;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000539 int fd;
540
541 fd = open(filename, O_RDONLY);
542 if (fd < 0)
543 return NULL;
544 if (!key_perm_ok(fd, filename)) {
Ben Lindstrom15f33862001-04-16 02:00:02 +0000545 error("bad permissions: ignore key: %s", filename);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000546 close(fd);
547 return NULL;
548 }
549 pub = key_load_public_rsa1(fd, filename, commentp);
550 lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
551 if (pub == NULL) {
552 /* closes fd */
Ben Lindstrom322915d2001-06-05 20:46:32 +0000553 prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
554 /* use the filename as a comment for PEM */
555 if (commentp && prv)
Ben Lindstrom2d0356f2001-06-05 21:13:57 +0000556 *commentp = xstrdup(filename);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000557 } else {
558 /* it's a SSH v1 key if the public key part is readable */
559 key_free(pub);
560 /* closes fd */
Ben Lindstrom322915d2001-06-05 20:46:32 +0000561 prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
Ben Lindstromd0fca422001-03-26 13:44:06 +0000562 }
Ben Lindstrom322915d2001-06-05 20:46:32 +0000563 return prv;
Damien Millereba71ba2000-04-29 23:57:08 +1000564}
Damien Millere4340be2000-09-16 13:29:08 +1100565
Ben Lindstrombba81212001-06-25 05:01:22 +0000566static int
Ben Lindstromd0fca422001-03-26 13:44:06 +0000567key_try_load_public(Key *k, const char *filename, char **commentp)
Damien Millere4340be2000-09-16 13:29:08 +1100568{
569 FILE *f;
Ben Lindstromd0fca422001-03-26 13:44:06 +0000570 char line[4096];
Damien Millere4340be2000-09-16 13:29:08 +1100571 char *cp;
572
573 f = fopen(filename, "r");
574 if (f != NULL) {
575 while (fgets(line, sizeof(line), f)) {
576 line[sizeof(line)-1] = '\0';
577 cp = line;
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000578 switch (*cp) {
Damien Millere4340be2000-09-16 13:29:08 +1100579 case '#':
580 case '\n':
581 case '\0':
582 continue;
583 }
584 /* Skip leading whitespace. */
585 for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
586 ;
587 if (*cp) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100588 if (key_read(k, &cp) == 1) {
Damien Millere4340be2000-09-16 13:29:08 +1100589 if (commentp)
590 *commentp=xstrdup(filename);
591 fclose(f);
592 return 1;
593 }
594 }
595 }
596 fclose(f);
597 }
598 return 0;
599}
600
Ben Lindstromd0fca422001-03-26 13:44:06 +0000601/* load public key from ssh v1 private or any pubkey file */
602Key *
603key_load_public(const char *filename, char **commentp)
Damien Millere4340be2000-09-16 13:29:08 +1100604{
Ben Lindstromd0fca422001-03-26 13:44:06 +0000605 Key *pub;
606 char file[MAXPATHLEN];
Damien Millere4340be2000-09-16 13:29:08 +1100607
Ben Lindstromd0fca422001-03-26 13:44:06 +0000608 pub = key_load_public_type(KEY_RSA1, filename, commentp);
609 if (pub != NULL)
610 return pub;
611 pub = key_new(KEY_UNSPEC);
612 if (key_try_load_public(pub, filename, commentp) == 1)
613 return pub;
614 if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
615 (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
616 (key_try_load_public(pub, file, commentp) == 1))
617 return pub;
618 key_free(pub);
619 return NULL;
Damien Millere4340be2000-09-16 13:29:08 +1100620}