Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 5 | * This file contains functions for reading and writing identity files, and |
| 6 | * for reading the passphrase from the user. |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 7 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 8 | * 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 Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 36 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 37 | |
| 38 | #include "includes.h" |
Ben Lindstrom | 80cb27d | 2002-03-05 01:33:36 +0000 | [diff] [blame^] | 39 | RCSID("$OpenBSD: authfile.c,v 1.48 2002/02/28 15:46:33 markus Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 40 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 41 | #include <openssl/err.h> |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 42 | #include <openssl/evp.h> |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 43 | #include <openssl/pem.h> |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 44 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 45 | #include "cipher.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 46 | #include "xmalloc.h" |
| 47 | #include "buffer.h" |
| 48 | #include "bufaux.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 49 | #include "key.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 50 | #include "ssh.h" |
| 51 | #include "log.h" |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 52 | #include "authfile.h" |
Damien Miller | 040b64f | 2002-01-22 23:10:04 +1100 | [diff] [blame] | 53 | #include "rsa.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 54 | |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 55 | /* Version identification string for SSH v1 identity files. */ |
Ben Lindstrom | 1170d71 | 2001-01-29 07:51:26 +0000 | [diff] [blame] | 56 | static const char authfile_id_string[] = |
| 57 | "SSH PRIVATE KEY FILE FORMAT 1.1\n"; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 58 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 59 | /* |
| 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 Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 65 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 66 | static int |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 67 | key_save_private_rsa1(Key *key, const char *filename, const char *passphrase, |
| 68 | const char *comment) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 69 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 70 | Buffer buffer, encrypted; |
Damien Miller | 708d21c | 2002-01-22 23:18:15 +1100 | [diff] [blame] | 71 | u_char buf[100], *cp; |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 72 | int fd, i, cipher_num; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 73 | CipherContext ciphercontext; |
| 74 | Cipher *cipher; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 75 | u_int32_t rand; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 76 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 77 | /* |
| 78 | * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting |
| 79 | * to another cipher; otherwise use SSH_AUTHFILE_CIPHER. |
| 80 | */ |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 81 | cipher_num = (strcmp(passphrase, "") == 0) ? |
| 82 | SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER; |
| 83 | if ((cipher = cipher_by_number(cipher_num)) == NULL) |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 84 | fatal("save_private_key_rsa: bad cipher"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 85 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 86 | /* This buffer is used to built the secret part of the private key. */ |
| 87 | buffer_init(&buffer); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 88 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 89 | /* 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 Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 96 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 97 | /* |
| 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 Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 102 | 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 Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 106 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 107 | /* 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 Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 110 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 111 | /* This buffer will be used to contain the data in the file. */ |
| 112 | buffer_init(&encrypted); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 113 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 114 | /* First store keyfile id string. */ |
Ben Lindstrom | 1170d71 | 2001-01-29 07:51:26 +0000 | [diff] [blame] | 115 | for (i = 0; authfile_id_string[i]; i++) |
| 116 | buffer_put_char(&encrypted, authfile_id_string[i]); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 117 | buffer_put_char(&encrypted, 0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 118 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 119 | /* Store cipher type. */ |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 120 | buffer_put_char(&encrypted, cipher_num); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 121 | buffer_put_int(&encrypted, 0); /* For future extension */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 122 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 123 | /* Store public key. This will be in plain text. */ |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 124 | 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 Lindstrom | 664408d | 2001-06-09 01:42:01 +0000 | [diff] [blame] | 127 | buffer_put_cstring(&encrypted, comment); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 128 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 129 | /* Allocate space for the private part of the key in the buffer. */ |
Damien Miller | 5a6b4fe | 2001-12-21 14:56:54 +1100 | [diff] [blame] | 130 | cp = buffer_append_space(&encrypted, buffer_len(&buffer)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 131 | |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 132 | cipher_set_key_string(&ciphercontext, cipher, passphrase, |
| 133 | CIPHER_ENCRYPT); |
| 134 | cipher_crypt(&ciphercontext, cp, |
Damien Miller | 708d21c | 2002-01-22 23:18:15 +1100 | [diff] [blame] | 135 | buffer_ptr(&buffer), buffer_len(&buffer)); |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 136 | cipher_cleanup(&ciphercontext); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 137 | memset(&ciphercontext, 0, sizeof(ciphercontext)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 138 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 139 | /* Destroy temporary data. */ |
| 140 | memset(buf, 0, sizeof(buf)); |
| 141 | buffer_free(&buffer); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 142 | |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 143 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); |
Ben Lindstrom | 15f3386 | 2001-04-16 02:00:02 +0000 | [diff] [blame] | 144 | if (fd < 0) { |
| 145 | error("open %s failed: %s.", filename, strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 146 | return 0; |
Ben Lindstrom | 15f3386 | 2001-04-16 02:00:02 +0000 | [diff] [blame] | 147 | } |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 148 | if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) != |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 149 | buffer_len(&encrypted)) { |
Ben Lindstrom | 15f3386 | 2001-04-16 02:00:02 +0000 | [diff] [blame] | 150 | error("write to key file %s failed: %s", filename, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 151 | strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 152 | buffer_free(&encrypted); |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 153 | close(fd); |
Damien Miller | 78315eb | 2000-09-29 23:01:36 +1100 | [diff] [blame] | 154 | unlink(filename); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 155 | return 0; |
| 156 | } |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 157 | close(fd); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 158 | buffer_free(&encrypted); |
| 159 | return 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 160 | } |
| 161 | |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 162 | /* save SSH v2 key in OpenSSL PEM format */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 163 | static int |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 164 | key_save_private_pem(Key *key, const char *filename, const char *_passphrase, |
| 165 | const char *comment) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 166 | { |
| 167 | FILE *fp; |
| 168 | int fd; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 169 | int success = 0; |
| 170 | int len = strlen(_passphrase); |
Ben Lindstrom | 90fd814 | 2002-02-26 18:09:42 +0000 | [diff] [blame] | 171 | u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL; |
Ben Lindstrom | 80cb27d | 2002-03-05 01:33:36 +0000 | [diff] [blame^] | 172 | const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 173 | |
| 174 | if (len > 0 && len <= 4) { |
Ben Lindstrom | 15f3386 | 2001-04-16 02:00:02 +0000 | [diff] [blame] | 175 | error("passphrase too short: have %d bytes, need > 4", len); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 176 | return 0; |
| 177 | } |
| 178 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); |
| 179 | if (fd < 0) { |
Ben Lindstrom | 15f3386 | 2001-04-16 02:00:02 +0000 | [diff] [blame] | 180 | error("open %s failed: %s.", filename, strerror(errno)); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 181 | return 0; |
| 182 | } |
| 183 | fp = fdopen(fd, "w"); |
| 184 | if (fp == NULL ) { |
Ben Lindstrom | 15f3386 | 2001-04-16 02:00:02 +0000 | [diff] [blame] | 185 | error("fdopen %s failed: %s.", filename, strerror(errno)); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 186 | close(fd); |
| 187 | return 0; |
| 188 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 189 | switch (key->type) { |
Ben Lindstrom | c111660 | 2001-03-29 00:28:37 +0000 | [diff] [blame] | 190 | 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 Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 198 | } |
| 199 | fclose(fp); |
| 200 | return success; |
| 201 | } |
| 202 | |
| 203 | int |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 204 | key_save_private(Key *key, const char *filename, const char *passphrase, |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 205 | const char *comment) |
| 206 | { |
| 207 | switch (key->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 208 | case KEY_RSA1: |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 209 | return key_save_private_rsa1(key, filename, passphrase, |
| 210 | comment); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 211 | break; |
| 212 | case KEY_DSA: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 213 | case KEY_RSA: |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 214 | return key_save_private_pem(key, filename, passphrase, |
| 215 | comment); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 216 | break; |
| 217 | default: |
| 218 | break; |
| 219 | } |
Ben Lindstrom | 15f3386 | 2001-04-16 02:00:02 +0000 | [diff] [blame] | 220 | error("key_save_private: cannot save key type %d", key->type); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 221 | return 0; |
| 222 | } |
| 223 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 224 | /* |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 225 | * 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 Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 227 | * otherwise. |
| 228 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 229 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 230 | static Key * |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 231 | key_load_public_rsa1(int fd, const char *filename, char **commentp) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 232 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 233 | Buffer buffer; |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 234 | Key *pub; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 235 | char *cp; |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 236 | int i; |
| 237 | off_t len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 238 | |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 239 | len = lseek(fd, (off_t) 0, SEEK_END); |
| 240 | lseek(fd, (off_t) 0, SEEK_SET); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 241 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 242 | buffer_init(&buffer); |
Damien Miller | 5a6b4fe | 2001-12-21 14:56:54 +1100 | [diff] [blame] | 243 | cp = buffer_append_space(&buffer, len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 244 | |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 245 | if (read(fd, cp, (size_t) len) != (size_t) len) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 246 | debug("Read from key file %.200s failed: %.100s", filename, |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 247 | strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 248 | buffer_free(&buffer); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 249 | return NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 250 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 251 | |
Ben Lindstrom | 1170d71 | 2001-01-29 07:51:26 +0000 | [diff] [blame] | 252 | /* Check that it is at least big enough to contain the ID string. */ |
| 253 | if (len < sizeof(authfile_id_string)) { |
Damien Miller | 058655c | 2001-10-10 15:03:36 +1000 | [diff] [blame] | 254 | debug3("Not a RSA1 key file %.200s.", filename); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 255 | buffer_free(&buffer); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 256 | return NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 257 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 258 | /* |
| 259 | * Make sure it begins with the id string. Consume the id string |
| 260 | * from the buffer. |
| 261 | */ |
Ben Lindstrom | 1170d71 | 2001-01-29 07:51:26 +0000 | [diff] [blame] | 262 | for (i = 0; i < sizeof(authfile_id_string); i++) |
| 263 | if (buffer_get_char(&buffer) != authfile_id_string[i]) { |
Damien Miller | 058655c | 2001-10-10 15:03:36 +1000 | [diff] [blame] | 264 | debug3("Not a RSA1 key file %.200s.", filename); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 265 | buffer_free(&buffer); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 266 | return NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 267 | } |
| 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 Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 274 | 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 Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 279 | /* The encrypted private part is not parsed by this function. */ |
| 280 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 281 | buffer_free(&buffer); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 282 | return pub; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 283 | } |
| 284 | |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 285 | /* load public key from private-key file, works only for SSH v1 */ |
| 286 | Key * |
| 287 | key_load_public_type(int type, const char *filename, char **commentp) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 288 | { |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 289 | 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 Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 299 | } |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 300 | return NULL; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 301 | } |
| 302 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 303 | /* |
| 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 Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 309 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 310 | static Key * |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 311 | key_load_private_rsa1(int fd, const char *filename, const char *passphrase, |
| 312 | char **commentp) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 313 | { |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 314 | int i, check1, check2, cipher_type; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 315 | off_t len; |
| 316 | Buffer buffer, decrypted; |
Damien Miller | 708d21c | 2002-01-22 23:18:15 +1100 | [diff] [blame] | 317 | u_char *cp; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 318 | CipherContext ciphercontext; |
| 319 | Cipher *cipher; |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 320 | Key *prv = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 321 | |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 322 | len = lseek(fd, (off_t) 0, SEEK_END); |
| 323 | lseek(fd, (off_t) 0, SEEK_SET); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 324 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 325 | buffer_init(&buffer); |
Damien Miller | 5a6b4fe | 2001-12-21 14:56:54 +1100 | [diff] [blame] | 326 | cp = buffer_append_space(&buffer, len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 327 | |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 328 | if (read(fd, cp, (size_t) len) != (size_t) len) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 329 | debug("Read from key file %.200s failed: %.100s", filename, |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 330 | strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 331 | buffer_free(&buffer); |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 332 | close(fd); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 333 | return NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 334 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 335 | |
Ben Lindstrom | 1170d71 | 2001-01-29 07:51:26 +0000 | [diff] [blame] | 336 | /* Check that it is at least big enough to contain the ID string. */ |
| 337 | if (len < sizeof(authfile_id_string)) { |
Damien Miller | 058655c | 2001-10-10 15:03:36 +1000 | [diff] [blame] | 338 | debug3("Not a RSA1 key file %.200s.", filename); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 339 | buffer_free(&buffer); |
Ben Lindstrom | b257cca | 2001-03-05 04:59:27 +0000 | [diff] [blame] | 340 | close(fd); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 341 | return NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 342 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 343 | /* |
| 344 | * Make sure it begins with the id string. Consume the id string |
| 345 | * from the buffer. |
| 346 | */ |
Ben Lindstrom | 1170d71 | 2001-01-29 07:51:26 +0000 | [diff] [blame] | 347 | for (i = 0; i < sizeof(authfile_id_string); i++) |
| 348 | if (buffer_get_char(&buffer) != authfile_id_string[i]) { |
Damien Miller | 058655c | 2001-10-10 15:03:36 +1000 | [diff] [blame] | 349 | debug3("Not a RSA1 key file %.200s.", filename); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 350 | buffer_free(&buffer); |
Ben Lindstrom | b257cca | 2001-03-05 04:59:27 +0000 | [diff] [blame] | 351 | close(fd); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 352 | return NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 353 | } |
Ben Lindstrom | b257cca | 2001-03-05 04:59:27 +0000 | [diff] [blame] | 354 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 355 | /* Read cipher type. */ |
| 356 | cipher_type = buffer_get_char(&buffer); |
| 357 | (void) buffer_get_int(&buffer); /* Reserved data. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 358 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 359 | /* Read the public key from the buffer. */ |
| 360 | buffer_get_int(&buffer); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 361 | 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 Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 367 | else |
| 368 | xfree(buffer_get_string(&buffer, NULL)); |
| 369 | |
| 370 | /* Check that it is a supported cipher. */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 371 | 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 Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 375 | buffer_free(&buffer); |
| 376 | goto fail; |
| 377 | } |
| 378 | /* Initialize space for decrypted data. */ |
| 379 | buffer_init(&decrypted); |
Damien Miller | 5a6b4fe | 2001-12-21 14:56:54 +1100 | [diff] [blame] | 380 | cp = buffer_append_space(&decrypted, buffer_len(&buffer)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 381 | |
| 382 | /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 383 | cipher_set_key_string(&ciphercontext, cipher, passphrase, |
| 384 | CIPHER_DECRYPT); |
| 385 | cipher_crypt(&ciphercontext, cp, |
Damien Miller | 708d21c | 2002-01-22 23:18:15 +1100 | [diff] [blame] | 386 | buffer_ptr(&buffer), buffer_len(&buffer)); |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 387 | cipher_cleanup(&ciphercontext); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 388 | memset(&ciphercontext, 0, sizeof(ciphercontext)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 389 | buffer_free(&buffer); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 390 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 391 | check1 = buffer_get_char(&decrypted); |
| 392 | check2 = buffer_get_char(&decrypted); |
| 393 | if (check1 != buffer_get_char(&decrypted) || |
| 394 | check2 != buffer_get_char(&decrypted)) { |
| 395 | if (strcmp(passphrase, "") != 0) |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 396 | debug("Bad passphrase supplied for key file %.200s.", |
| 397 | filename); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 398 | /* Bad passphrase. */ |
| 399 | buffer_free(&decrypted); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 400 | goto fail; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 401 | } |
| 402 | /* Read the rest of the private key. */ |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 403 | buffer_get_bignum(&decrypted, prv->rsa->d); |
| 404 | buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */ |
| 405 | /* in SSL and SSH v1 p and q are exchanged */ |
| 406 | buffer_get_bignum(&decrypted, prv->rsa->q); /* p */ |
| 407 | buffer_get_bignum(&decrypted, prv->rsa->p); /* q */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 408 | |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 409 | /* calculate p-1 and q-1 */ |
Damien Miller | da75516 | 2002-01-22 23:09:22 +1100 | [diff] [blame] | 410 | rsa_generate_additional_parameters(prv->rsa); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 411 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 412 | buffer_free(&decrypted); |
Ben Lindstrom | b257cca | 2001-03-05 04:59:27 +0000 | [diff] [blame] | 413 | close(fd); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 414 | return prv; |
| 415 | |
| 416 | fail: |
| 417 | if (commentp) |
| 418 | xfree(*commentp); |
| 419 | close(fd); |
| 420 | key_free(prv); |
| 421 | return NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 422 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 423 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 424 | static Key * |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 425 | key_load_private_pem(int fd, int type, const char *passphrase, |
| 426 | char **commentp) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 427 | { |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 428 | FILE *fp; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 429 | EVP_PKEY *pk = NULL; |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 430 | Key *prv = NULL; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 431 | char *name = "<no key>"; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 432 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 433 | fp = fdopen(fd, "r"); |
| 434 | if (fp == NULL) { |
Ben Lindstrom | 15f3386 | 2001-04-16 02:00:02 +0000 | [diff] [blame] | 435 | error("fdopen failed: %s", strerror(errno)); |
Ben Lindstrom | b257cca | 2001-03-05 04:59:27 +0000 | [diff] [blame] | 436 | close(fd); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 437 | return NULL; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 438 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 439 | pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase); |
| 440 | if (pk == NULL) { |
Ben Lindstrom | 648772f | 2001-04-19 20:47:10 +0000 | [diff] [blame] | 441 | debug("PEM_read_PrivateKey failed"); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 442 | (void)ERR_get_error(); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 443 | } else if (pk->type == EVP_PKEY_RSA && |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 444 | (type == KEY_UNSPEC||type==KEY_RSA)) { |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 445 | prv = key_new(KEY_UNSPEC); |
| 446 | prv->rsa = EVP_PKEY_get1_RSA(pk); |
| 447 | prv->type = KEY_RSA; |
| 448 | name = "rsa w/o comment"; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 449 | #ifdef DEBUG_PK |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 450 | RSA_print_fp(stderr, prv->rsa, 8); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 451 | #endif |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 452 | } else if (pk->type == EVP_PKEY_DSA && |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 453 | (type == KEY_UNSPEC||type==KEY_DSA)) { |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 454 | prv = key_new(KEY_UNSPEC); |
| 455 | prv->dsa = EVP_PKEY_get1_DSA(pk); |
| 456 | prv->type = KEY_DSA; |
| 457 | name = "dsa w/o comment"; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 458 | #ifdef DEBUG_PK |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 459 | DSA_print_fp(stderr, prv->dsa, 8); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 460 | #endif |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 461 | } else { |
| 462 | error("PEM_read_PrivateKey: mismatch or " |
| 463 | "unknown EVP_PKEY save_type %d", pk->save_type); |
| 464 | } |
| 465 | fclose(fp); |
| 466 | if (pk != NULL) |
| 467 | EVP_PKEY_free(pk); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 468 | if (prv != NULL && commentp) |
| 469 | *commentp = xstrdup(name); |
| 470 | debug("read PEM private key done: type %s", |
| 471 | prv ? key_type(prv) : "<unknown>"); |
| 472 | return prv; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 473 | } |
| 474 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 475 | static int |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 476 | key_perm_ok(int fd, const char *filename) |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 477 | { |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 478 | struct stat st; |
| 479 | |
Ben Lindstrom | 7aff261 | 2001-09-23 13:53:22 +0000 | [diff] [blame] | 480 | if (fstat(fd, &st) < 0) |
| 481 | return 0; |
| 482 | /* |
| 483 | * if a key owned by the user is accessed, then we check the |
| 484 | * permissions of the file. if the key owned by a different user, |
| 485 | * then we don't care. |
| 486 | */ |
Damien Miller | b70b61f | 2000-09-16 16:25:12 +1100 | [diff] [blame] | 487 | #ifdef HAVE_CYGWIN |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 488 | if (check_ntsec(filename)) |
Damien Miller | b70b61f | 2000-09-16 16:25:12 +1100 | [diff] [blame] | 489 | #endif |
Ben Lindstrom | 7aff261 | 2001-09-23 13:53:22 +0000 | [diff] [blame] | 490 | if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) { |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 491 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| 492 | error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); |
| 493 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
Ben Lindstrom | 7aff261 | 2001-09-23 13:53:22 +0000 | [diff] [blame] | 494 | error("Permissions 0%3.3o for '%s' are too open.", |
Ben Lindstrom | b257cca | 2001-03-05 04:59:27 +0000 | [diff] [blame] | 495 | st.st_mode & 0777, filename); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 496 | error("It is recommended that your private key files are NOT accessible by others."); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 497 | error("This private key will be ignored."); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 498 | return 0; |
| 499 | } |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 500 | return 1; |
| 501 | } |
Ben Lindstrom | b257cca | 2001-03-05 04:59:27 +0000 | [diff] [blame] | 502 | |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 503 | Key * |
| 504 | key_load_private_type(int type, const char *filename, const char *passphrase, |
| 505 | char **commentp) |
| 506 | { |
| 507 | int fd; |
| 508 | |
| 509 | fd = open(filename, O_RDONLY); |
| 510 | if (fd < 0) |
| 511 | return NULL; |
| 512 | if (!key_perm_ok(fd, filename)) { |
Ben Lindstrom | 15f3386 | 2001-04-16 02:00:02 +0000 | [diff] [blame] | 513 | error("bad permissions: ignore key: %s", filename); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 514 | close(fd); |
| 515 | return NULL; |
| 516 | } |
| 517 | switch (type) { |
| 518 | case KEY_RSA1: |
| 519 | return key_load_private_rsa1(fd, filename, passphrase, |
| 520 | commentp); |
| 521 | /* closes fd */ |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 522 | break; |
| 523 | case KEY_DSA: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 524 | case KEY_RSA: |
| 525 | case KEY_UNSPEC: |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 526 | return key_load_private_pem(fd, type, passphrase, commentp); |
| 527 | /* closes fd */ |
Ben Lindstrom | b257cca | 2001-03-05 04:59:27 +0000 | [diff] [blame] | 528 | break; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 529 | default: |
Ben Lindstrom | b257cca | 2001-03-05 04:59:27 +0000 | [diff] [blame] | 530 | close(fd); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 531 | break; |
| 532 | } |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 533 | return NULL; |
| 534 | } |
| 535 | |
| 536 | Key * |
| 537 | key_load_private(const char *filename, const char *passphrase, |
| 538 | char **commentp) |
| 539 | { |
Ben Lindstrom | 322915d | 2001-06-05 20:46:32 +0000 | [diff] [blame] | 540 | Key *pub, *prv; |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 541 | int fd; |
| 542 | |
| 543 | fd = open(filename, O_RDONLY); |
| 544 | if (fd < 0) |
| 545 | return NULL; |
| 546 | if (!key_perm_ok(fd, filename)) { |
Ben Lindstrom | 15f3386 | 2001-04-16 02:00:02 +0000 | [diff] [blame] | 547 | error("bad permissions: ignore key: %s", filename); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 548 | close(fd); |
| 549 | return NULL; |
| 550 | } |
| 551 | pub = key_load_public_rsa1(fd, filename, commentp); |
| 552 | lseek(fd, (off_t) 0, SEEK_SET); /* rewind */ |
| 553 | if (pub == NULL) { |
| 554 | /* closes fd */ |
Ben Lindstrom | 322915d | 2001-06-05 20:46:32 +0000 | [diff] [blame] | 555 | prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL); |
| 556 | /* use the filename as a comment for PEM */ |
| 557 | if (commentp && prv) |
Ben Lindstrom | 2d0356f | 2001-06-05 21:13:57 +0000 | [diff] [blame] | 558 | *commentp = xstrdup(filename); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 559 | } else { |
| 560 | /* it's a SSH v1 key if the public key part is readable */ |
| 561 | key_free(pub); |
| 562 | /* closes fd */ |
Ben Lindstrom | 322915d | 2001-06-05 20:46:32 +0000 | [diff] [blame] | 563 | prv = key_load_private_rsa1(fd, filename, passphrase, NULL); |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 564 | } |
Ben Lindstrom | 322915d | 2001-06-05 20:46:32 +0000 | [diff] [blame] | 565 | return prv; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 566 | } |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 567 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 568 | static int |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 569 | key_try_load_public(Key *k, const char *filename, char **commentp) |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 570 | { |
| 571 | FILE *f; |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 572 | char line[4096]; |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 573 | char *cp; |
| 574 | |
| 575 | f = fopen(filename, "r"); |
| 576 | if (f != NULL) { |
| 577 | while (fgets(line, sizeof(line), f)) { |
| 578 | line[sizeof(line)-1] = '\0'; |
| 579 | cp = line; |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 580 | switch (*cp) { |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 581 | case '#': |
| 582 | case '\n': |
| 583 | case '\0': |
| 584 | continue; |
| 585 | } |
| 586 | /* Skip leading whitespace. */ |
| 587 | for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) |
| 588 | ; |
| 589 | if (*cp) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 590 | if (key_read(k, &cp) == 1) { |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 591 | if (commentp) |
| 592 | *commentp=xstrdup(filename); |
| 593 | fclose(f); |
| 594 | return 1; |
| 595 | } |
| 596 | } |
| 597 | } |
| 598 | fclose(f); |
| 599 | } |
| 600 | return 0; |
| 601 | } |
| 602 | |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 603 | /* load public key from ssh v1 private or any pubkey file */ |
| 604 | Key * |
| 605 | key_load_public(const char *filename, char **commentp) |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 606 | { |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 607 | Key *pub; |
| 608 | char file[MAXPATHLEN]; |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 609 | |
Ben Lindstrom | d0fca42 | 2001-03-26 13:44:06 +0000 | [diff] [blame] | 610 | pub = key_load_public_type(KEY_RSA1, filename, commentp); |
| 611 | if (pub != NULL) |
| 612 | return pub; |
| 613 | pub = key_new(KEY_UNSPEC); |
| 614 | if (key_try_load_public(pub, filename, commentp) == 1) |
| 615 | return pub; |
| 616 | if ((strlcpy(file, filename, sizeof file) < sizeof(file)) && |
| 617 | (strlcat(file, ".pub", sizeof file) < sizeof(file)) && |
| 618 | (key_try_load_public(pub, file, commentp) == 1)) |
| 619 | return pub; |
| 620 | key_free(pub); |
| 621 | return NULL; |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 622 | } |