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 | * |
| 3 | * authfile.c |
| 4 | * |
| 5 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 6 | * |
| 7 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 8 | * All rights reserved |
| 9 | * |
| 10 | * Created: Mon Mar 27 03:52:05 1995 ylo |
| 11 | * |
| 12 | * This file contains functions for reading and writing identity files, and |
| 13 | * for reading the passphrase from the user. |
| 14 | * |
| 15 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 16 | |
| 17 | #include "includes.h" |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 18 | RCSID("$Id: authfile.c,v 1.6 1999/12/07 04:38:32 damien Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 19 | |
Damien Miller | 7f6ea02 | 1999-10-28 13:25:17 +1000 | [diff] [blame] | 20 | #ifdef HAVE_OPENSSL |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 21 | #include <openssl/bn.h> |
Damien Miller | 7f6ea02 | 1999-10-28 13:25:17 +1000 | [diff] [blame] | 22 | #endif |
| 23 | #ifdef HAVE_SSL |
| 24 | #include <ssl/bn.h> |
| 25 | #endif |
| 26 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 27 | #include "xmalloc.h" |
| 28 | #include "buffer.h" |
| 29 | #include "bufaux.h" |
| 30 | #include "cipher.h" |
| 31 | #include "ssh.h" |
| 32 | |
| 33 | /* Version identification string for identity files. */ |
| 34 | #define AUTHFILE_ID_STRING "SSH PRIVATE KEY FILE FORMAT 1.1\n" |
| 35 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 36 | /* |
| 37 | * Saves the authentication (private) key in a file, encrypting it with |
| 38 | * passphrase. The identification of the file (lowest 64 bits of n) will |
| 39 | * precede the key to provide identification of the key without needing a |
| 40 | * passphrase. |
| 41 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 42 | |
| 43 | int |
| 44 | save_private_key(const char *filename, const char *passphrase, |
| 45 | RSA *key, const char *comment) |
| 46 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 47 | Buffer buffer, encrypted; |
| 48 | char buf[100], *cp; |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 49 | int fd, i; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 50 | CipherContext cipher; |
| 51 | int cipher_type; |
| 52 | u_int32_t rand; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 53 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 54 | /* |
| 55 | * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting |
| 56 | * to another cipher; otherwise use SSH_AUTHFILE_CIPHER. |
| 57 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 58 | if (strcmp(passphrase, "") == 0) |
| 59 | cipher_type = SSH_CIPHER_NONE; |
| 60 | else |
| 61 | cipher_type = SSH_AUTHFILE_CIPHER; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 62 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 63 | /* This buffer is used to built the secret part of the private key. */ |
| 64 | buffer_init(&buffer); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 65 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 66 | /* Put checkbytes for checking passphrase validity. */ |
| 67 | rand = arc4random(); |
| 68 | buf[0] = rand & 0xff; |
| 69 | buf[1] = (rand >> 8) & 0xff; |
| 70 | buf[2] = buf[0]; |
| 71 | buf[3] = buf[1]; |
| 72 | buffer_append(&buffer, buf, 4); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 73 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 74 | /* |
| 75 | * Store the private key (n and e will not be stored because they |
| 76 | * will be stored in plain text, and storing them also in encrypted |
| 77 | * format would just give known plaintext). |
| 78 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 79 | buffer_put_bignum(&buffer, key->d); |
| 80 | buffer_put_bignum(&buffer, key->iqmp); |
| 81 | buffer_put_bignum(&buffer, key->q); /* reverse from SSL p */ |
| 82 | buffer_put_bignum(&buffer, key->p); /* reverse from SSL q */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 83 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 84 | /* Pad the part to be encrypted until its size is a multiple of 8. */ |
| 85 | while (buffer_len(&buffer) % 8 != 0) |
| 86 | buffer_put_char(&buffer, 0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 87 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 88 | /* This buffer will be used to contain the data in the file. */ |
| 89 | buffer_init(&encrypted); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 90 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 91 | /* First store keyfile id string. */ |
| 92 | cp = AUTHFILE_ID_STRING; |
| 93 | for (i = 0; cp[i]; i++) |
| 94 | buffer_put_char(&encrypted, cp[i]); |
| 95 | buffer_put_char(&encrypted, 0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 96 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 97 | /* Store cipher type. */ |
| 98 | buffer_put_char(&encrypted, cipher_type); |
| 99 | buffer_put_int(&encrypted, 0); /* For future extension */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 100 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 101 | /* Store public key. This will be in plain text. */ |
| 102 | buffer_put_int(&encrypted, BN_num_bits(key->n)); |
| 103 | buffer_put_bignum(&encrypted, key->n); |
| 104 | buffer_put_bignum(&encrypted, key->e); |
| 105 | buffer_put_string(&encrypted, comment, strlen(comment)); |
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 | /* Allocate space for the private part of the key in the buffer. */ |
| 108 | buffer_append_space(&encrypted, &cp, buffer_len(&buffer)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 109 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 110 | cipher_set_key_string(&cipher, cipher_type, passphrase, 1); |
| 111 | cipher_encrypt(&cipher, (unsigned char *) cp, |
| 112 | (unsigned char *) buffer_ptr(&buffer), |
| 113 | buffer_len(&buffer)); |
| 114 | memset(&cipher, 0, sizeof(cipher)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 115 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 116 | /* Destroy temporary data. */ |
| 117 | memset(buf, 0, sizeof(buf)); |
| 118 | buffer_free(&buffer); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 119 | |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 120 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); |
| 121 | if (fd < 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 122 | return 0; |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 123 | if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) != |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 124 | buffer_len(&encrypted)) { |
| 125 | debug("Write to key file %.200s failed: %.100s", filename, |
| 126 | strerror(errno)); |
| 127 | buffer_free(&encrypted); |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 128 | close(fd); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 129 | remove(filename); |
| 130 | return 0; |
| 131 | } |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 132 | close(fd); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 133 | buffer_free(&encrypted); |
| 134 | return 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 135 | } |
| 136 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 137 | /* |
| 138 | * Loads the public part of the key file. Returns 0 if an error was |
| 139 | * encountered (the file does not exist or is not readable), and non-zero |
| 140 | * otherwise. |
| 141 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 142 | |
| 143 | int |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 144 | load_public_key(const char *filename, RSA * pub, |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 145 | char **comment_return) |
| 146 | { |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 147 | int fd, i; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 148 | off_t len; |
| 149 | Buffer buffer; |
| 150 | char *cp; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 151 | |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 152 | fd = open(filename, O_RDONLY); |
| 153 | if (fd < 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 154 | return 0; |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 155 | len = lseek(fd, (off_t) 0, SEEK_END); |
| 156 | lseek(fd, (off_t) 0, SEEK_SET); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 157 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 158 | buffer_init(&buffer); |
| 159 | buffer_append_space(&buffer, &cp, len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 160 | |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 161 | if (read(fd, cp, (size_t) len) != (size_t) len) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 162 | debug("Read from key file %.200s failed: %.100s", filename, |
| 163 | strerror(errno)); |
| 164 | buffer_free(&buffer); |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 165 | close(fd); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 166 | return 0; |
| 167 | } |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 168 | close(fd); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 169 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 170 | /* Check that it is at least big enought to contain the ID string. */ |
| 171 | if (len < strlen(AUTHFILE_ID_STRING) + 1) { |
| 172 | debug("Bad key file %.200s.", filename); |
| 173 | buffer_free(&buffer); |
| 174 | return 0; |
| 175 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 176 | /* |
| 177 | * Make sure it begins with the id string. Consume the id string |
| 178 | * from the buffer. |
| 179 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 180 | for (i = 0; i < (unsigned int) strlen(AUTHFILE_ID_STRING) + 1; i++) |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 181 | if (buffer_get_char(&buffer) != (u_char) AUTHFILE_ID_STRING[i]) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 182 | debug("Bad key file %.200s.", filename); |
| 183 | buffer_free(&buffer); |
| 184 | return 0; |
| 185 | } |
| 186 | /* Skip cipher type and reserved data. */ |
| 187 | (void) buffer_get_char(&buffer); /* cipher type */ |
| 188 | (void) buffer_get_int(&buffer); /* reserved */ |
| 189 | |
| 190 | /* Read the public key from the buffer. */ |
| 191 | buffer_get_int(&buffer); |
| 192 | pub->n = BN_new(); |
| 193 | buffer_get_bignum(&buffer, pub->n); |
| 194 | pub->e = BN_new(); |
| 195 | buffer_get_bignum(&buffer, pub->e); |
| 196 | if (comment_return) |
| 197 | *comment_return = buffer_get_string(&buffer, NULL); |
| 198 | /* The encrypted private part is not parsed by this function. */ |
| 199 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 200 | buffer_free(&buffer); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 201 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 202 | return 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 203 | } |
| 204 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 205 | /* |
| 206 | * Loads the private key from the file. Returns 0 if an error is encountered |
| 207 | * (file does not exist or is not readable, or passphrase is bad). This |
| 208 | * initializes the private key. |
| 209 | * Assumes we are called under uid of the owner of the file. |
| 210 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 211 | |
| 212 | int |
| 213 | load_private_key(const char *filename, const char *passphrase, |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 214 | RSA * prv, char **comment_return) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 215 | { |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 216 | int fd, i, check1, check2, cipher_type; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 217 | off_t len; |
| 218 | Buffer buffer, decrypted; |
| 219 | char *cp; |
| 220 | CipherContext cipher; |
| 221 | BN_CTX *ctx; |
| 222 | BIGNUM *aux; |
| 223 | struct stat st; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 224 | |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 225 | fd = open(filename, O_RDONLY); |
| 226 | if (fd < 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 227 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 228 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 229 | /* check owner and modes */ |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 230 | if (fstat(fd, &st) < 0 || |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 231 | (st.st_uid != 0 && st.st_uid != getuid()) || |
| 232 | (st.st_mode & 077) != 0) { |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 233 | close(fd); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 234 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| 235 | error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); |
| 236 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
| 237 | error("Bad ownership or mode(0%3.3o) for '%s'.", |
| 238 | st.st_mode & 0777, filename); |
| 239 | error("It is recommended that your private key files are NOT accessible by others."); |
| 240 | return 0; |
| 241 | } |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 242 | len = lseek(fd, (off_t) 0, SEEK_END); |
| 243 | lseek(fd, (off_t) 0, SEEK_SET); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 244 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 245 | buffer_init(&buffer); |
| 246 | buffer_append_space(&buffer, &cp, len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 247 | |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 248 | if (read(fd, cp, (size_t) len) != (size_t) len) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 249 | debug("Read from key file %.200s failed: %.100s", filename, |
| 250 | strerror(errno)); |
| 251 | buffer_free(&buffer); |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 252 | close(fd); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 253 | return 0; |
| 254 | } |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 255 | close(fd); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 256 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 257 | /* Check that it is at least big enought to contain the ID string. */ |
| 258 | if (len < strlen(AUTHFILE_ID_STRING) + 1) { |
| 259 | debug("Bad key file %.200s.", filename); |
| 260 | buffer_free(&buffer); |
| 261 | return 0; |
| 262 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 263 | /* |
| 264 | * Make sure it begins with the id string. Consume the id string |
| 265 | * from the buffer. |
| 266 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 267 | for (i = 0; i < (unsigned int) strlen(AUTHFILE_ID_STRING) + 1; i++) |
| 268 | if (buffer_get_char(&buffer) != (unsigned char) AUTHFILE_ID_STRING[i]) { |
| 269 | debug("Bad key file %.200s.", filename); |
| 270 | buffer_free(&buffer); |
| 271 | return 0; |
| 272 | } |
| 273 | /* Read cipher type. */ |
| 274 | cipher_type = buffer_get_char(&buffer); |
| 275 | (void) buffer_get_int(&buffer); /* Reserved data. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 276 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 277 | /* Read the public key from the buffer. */ |
| 278 | buffer_get_int(&buffer); |
| 279 | prv->n = BN_new(); |
| 280 | buffer_get_bignum(&buffer, prv->n); |
| 281 | prv->e = BN_new(); |
| 282 | buffer_get_bignum(&buffer, prv->e); |
| 283 | if (comment_return) |
| 284 | *comment_return = buffer_get_string(&buffer, NULL); |
| 285 | else |
| 286 | xfree(buffer_get_string(&buffer, NULL)); |
| 287 | |
| 288 | /* Check that it is a supported cipher. */ |
| 289 | if (((cipher_mask() | SSH_CIPHER_NONE | SSH_AUTHFILE_CIPHER) & |
| 290 | (1 << cipher_type)) == 0) { |
| 291 | debug("Unsupported cipher %.100s used in key file %.200s.", |
| 292 | cipher_name(cipher_type), filename); |
| 293 | buffer_free(&buffer); |
| 294 | goto fail; |
| 295 | } |
| 296 | /* Initialize space for decrypted data. */ |
| 297 | buffer_init(&decrypted); |
| 298 | buffer_append_space(&decrypted, &cp, buffer_len(&buffer)); |
| 299 | |
| 300 | /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ |
| 301 | cipher_set_key_string(&cipher, cipher_type, passphrase, 0); |
| 302 | cipher_decrypt(&cipher, (unsigned char *) cp, |
| 303 | (unsigned char *) buffer_ptr(&buffer), |
| 304 | buffer_len(&buffer)); |
| 305 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 306 | buffer_free(&buffer); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 307 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 308 | check1 = buffer_get_char(&decrypted); |
| 309 | check2 = buffer_get_char(&decrypted); |
| 310 | if (check1 != buffer_get_char(&decrypted) || |
| 311 | check2 != buffer_get_char(&decrypted)) { |
| 312 | if (strcmp(passphrase, "") != 0) |
| 313 | debug("Bad passphrase supplied for key file %.200s.", filename); |
| 314 | /* Bad passphrase. */ |
| 315 | buffer_free(&decrypted); |
| 316 | fail: |
| 317 | BN_clear_free(prv->n); |
| 318 | BN_clear_free(prv->e); |
| 319 | if (comment_return) |
| 320 | xfree(*comment_return); |
| 321 | return 0; |
| 322 | } |
| 323 | /* Read the rest of the private key. */ |
| 324 | prv->d = BN_new(); |
| 325 | buffer_get_bignum(&decrypted, prv->d); |
| 326 | prv->iqmp = BN_new(); |
| 327 | buffer_get_bignum(&decrypted, prv->iqmp); /* u */ |
| 328 | /* in SSL and SSH p and q are exchanged */ |
| 329 | prv->q = BN_new(); |
| 330 | buffer_get_bignum(&decrypted, prv->q); /* p */ |
| 331 | prv->p = BN_new(); |
| 332 | buffer_get_bignum(&decrypted, prv->p); /* q */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 333 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 334 | ctx = BN_CTX_new(); |
| 335 | aux = BN_new(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 336 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 337 | BN_sub(aux, prv->q, BN_value_one()); |
| 338 | prv->dmq1 = BN_new(); |
| 339 | BN_mod(prv->dmq1, prv->d, aux, ctx); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 340 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 341 | BN_sub(aux, prv->p, BN_value_one()); |
| 342 | prv->dmp1 = BN_new(); |
| 343 | BN_mod(prv->dmp1, prv->d, aux, ctx); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 344 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 345 | BN_clear_free(aux); |
| 346 | BN_CTX_free(ctx); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 347 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 348 | buffer_free(&decrypted); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 349 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 350 | return 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 351 | } |