622 lines
17 KiB
C
622 lines
17 KiB
C
/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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* This file contains functions for reading and writing identity files, and
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* for reading the passphrase from the user.
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*
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*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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RCSID("$OpenBSD: authfile.c,v 1.32 2001/04/18 23:44:51 markus Exp $");
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/pem.h>
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#include "cipher.h"
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#include "xmalloc.h"
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#include "buffer.h"
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#include "bufaux.h"
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#include "key.h"
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#include "ssh.h"
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#include "log.h"
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#include "authfile.h"
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/* Version identification string for SSH v1 identity files. */
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static const char authfile_id_string[] =
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"SSH PRIVATE KEY FILE FORMAT 1.1\n";
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/*
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* Saves the authentication (private) key in a file, encrypting it with
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* passphrase. The identification of the file (lowest 64 bits of n) will
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* precede the key to provide identification of the key without needing a
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* passphrase.
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*/
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int
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key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
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const char *comment)
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{
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Buffer buffer, encrypted;
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char buf[100], *cp;
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int fd, i;
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CipherContext ciphercontext;
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Cipher *cipher;
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u_int32_t rand;
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/*
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* If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
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* to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
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*/
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if (strcmp(passphrase, "") == 0)
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cipher = cipher_by_number(SSH_CIPHER_NONE);
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else
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cipher = cipher_by_number(SSH_AUTHFILE_CIPHER);
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if (cipher == NULL)
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fatal("save_private_key_rsa: bad cipher");
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/* This buffer is used to built the secret part of the private key. */
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buffer_init(&buffer);
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/* Put checkbytes for checking passphrase validity. */
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rand = arc4random();
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buf[0] = rand & 0xff;
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buf[1] = (rand >> 8) & 0xff;
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buf[2] = buf[0];
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buf[3] = buf[1];
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buffer_append(&buffer, buf, 4);
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/*
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* Store the private key (n and e will not be stored because they
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* will be stored in plain text, and storing them also in encrypted
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* format would just give known plaintext).
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*/
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buffer_put_bignum(&buffer, key->rsa->d);
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buffer_put_bignum(&buffer, key->rsa->iqmp);
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buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
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buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
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/* Pad the part to be encrypted until its size is a multiple of 8. */
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while (buffer_len(&buffer) % 8 != 0)
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buffer_put_char(&buffer, 0);
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/* This buffer will be used to contain the data in the file. */
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buffer_init(&encrypted);
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/* First store keyfile id string. */
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for (i = 0; authfile_id_string[i]; i++)
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buffer_put_char(&encrypted, authfile_id_string[i]);
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buffer_put_char(&encrypted, 0);
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/* Store cipher type. */
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buffer_put_char(&encrypted, cipher->number);
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buffer_put_int(&encrypted, 0); /* For future extension */
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/* Store public key. This will be in plain text. */
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buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
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buffer_put_bignum(&encrypted, key->rsa->n);
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buffer_put_bignum(&encrypted, key->rsa->e);
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buffer_put_string(&encrypted, comment, strlen(comment));
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/* Allocate space for the private part of the key in the buffer. */
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buffer_append_space(&encrypted, &cp, buffer_len(&buffer));
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cipher_set_key_string(&ciphercontext, cipher, passphrase);
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cipher_encrypt(&ciphercontext, (u_char *) cp,
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(u_char *) buffer_ptr(&buffer), buffer_len(&buffer));
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memset(&ciphercontext, 0, sizeof(ciphercontext));
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/* Destroy temporary data. */
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memset(buf, 0, sizeof(buf));
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buffer_free(&buffer);
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fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
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if (fd < 0) {
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error("open %s failed: %s.", filename, strerror(errno));
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return 0;
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}
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if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
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buffer_len(&encrypted)) {
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error("write to key file %s failed: %s", filename,
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strerror(errno));
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buffer_free(&encrypted);
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close(fd);
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unlink(filename);
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return 0;
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}
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close(fd);
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buffer_free(&encrypted);
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return 1;
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}
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/* save SSH v2 key in OpenSSL PEM format */
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int
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key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
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const char *comment)
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{
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FILE *fp;
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int fd;
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int success = 0;
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int len = strlen(_passphrase);
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char *passphrase = (len > 0) ? (char *)_passphrase : NULL;
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EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
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if (len > 0 && len <= 4) {
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error("passphrase too short: have %d bytes, need > 4", len);
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return 0;
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}
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fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
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if (fd < 0) {
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error("open %s failed: %s.", filename, strerror(errno));
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return 0;
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}
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fp = fdopen(fd, "w");
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if (fp == NULL ) {
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error("fdopen %s failed: %s.", filename, strerror(errno));
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close(fd);
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return 0;
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}
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switch (key->type) {
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case KEY_DSA:
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success = PEM_write_DSAPrivateKey(fp, key->dsa,
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cipher, passphrase, len, NULL, NULL);
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break;
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case KEY_RSA:
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success = PEM_write_RSAPrivateKey(fp, key->rsa,
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cipher, passphrase, len, NULL, NULL);
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break;
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}
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fclose(fp);
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return success;
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}
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int
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key_save_private(Key *key, const char *filename, const char *passphrase,
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const char *comment)
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{
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switch (key->type) {
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case KEY_RSA1:
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return key_save_private_rsa1(key, filename, passphrase,
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comment);
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break;
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case KEY_DSA:
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case KEY_RSA:
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return key_save_private_pem(key, filename, passphrase,
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comment);
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break;
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default:
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break;
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}
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error("key_save_private: cannot save key type %d", key->type);
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return 0;
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}
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/*
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* Loads the public part of the ssh v1 key file. Returns NULL if an error was
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* encountered (the file does not exist or is not readable), and the key
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* otherwise.
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*/
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Key *
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key_load_public_rsa1(int fd, const char *filename, char **commentp)
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{
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Buffer buffer;
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Key *pub;
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char *cp;
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int i;
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off_t len;
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len = lseek(fd, (off_t) 0, SEEK_END);
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lseek(fd, (off_t) 0, SEEK_SET);
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buffer_init(&buffer);
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buffer_append_space(&buffer, &cp, len);
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if (read(fd, cp, (size_t) len) != (size_t) len) {
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debug("Read from key file %.200s failed: %.100s", filename,
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strerror(errno));
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buffer_free(&buffer);
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return NULL;
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}
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/* Check that it is at least big enough to contain the ID string. */
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if (len < sizeof(authfile_id_string)) {
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debug3("No RSA1 key file %.200s.", filename);
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buffer_free(&buffer);
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return NULL;
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}
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/*
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* Make sure it begins with the id string. Consume the id string
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* from the buffer.
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*/
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for (i = 0; i < sizeof(authfile_id_string); i++)
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if (buffer_get_char(&buffer) != authfile_id_string[i]) {
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debug3("No RSA1 key file %.200s.", filename);
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buffer_free(&buffer);
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return NULL;
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}
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/* Skip cipher type and reserved data. */
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(void) buffer_get_char(&buffer); /* cipher type */
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(void) buffer_get_int(&buffer); /* reserved */
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/* Read the public key from the buffer. */
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buffer_get_int(&buffer);
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pub = key_new(KEY_RSA1);
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buffer_get_bignum(&buffer, pub->rsa->n);
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buffer_get_bignum(&buffer, pub->rsa->e);
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if (commentp)
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*commentp = buffer_get_string(&buffer, NULL);
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/* The encrypted private part is not parsed by this function. */
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buffer_free(&buffer);
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return pub;
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}
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/* load public key from private-key file, works only for SSH v1 */
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Key *
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key_load_public_type(int type, const char *filename, char **commentp)
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{
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Key *pub;
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int fd;
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if (type == KEY_RSA1) {
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fd = open(filename, O_RDONLY);
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if (fd < 0)
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return NULL;
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pub = key_load_public_rsa1(fd, filename, commentp);
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close(fd);
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return pub;
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}
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return NULL;
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}
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/*
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* Loads the private key from the file. Returns 0 if an error is encountered
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* (file does not exist or is not readable, or passphrase is bad). This
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* initializes the private key.
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* Assumes we are called under uid of the owner of the file.
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*/
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Key *
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key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
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char **commentp)
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{
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int i, check1, check2, cipher_type;
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off_t len;
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Buffer buffer, decrypted;
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char *cp;
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CipherContext ciphercontext;
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Cipher *cipher;
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BN_CTX *ctx;
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BIGNUM *aux;
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Key *prv = NULL;
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len = lseek(fd, (off_t) 0, SEEK_END);
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lseek(fd, (off_t) 0, SEEK_SET);
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buffer_init(&buffer);
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buffer_append_space(&buffer, &cp, len);
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if (read(fd, cp, (size_t) len) != (size_t) len) {
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debug("Read from key file %.200s failed: %.100s", filename,
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strerror(errno));
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buffer_free(&buffer);
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close(fd);
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return NULL;
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}
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/* Check that it is at least big enough to contain the ID string. */
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if (len < sizeof(authfile_id_string)) {
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debug3("No RSA1 key file %.200s.", filename);
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buffer_free(&buffer);
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close(fd);
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return NULL;
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}
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/*
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* Make sure it begins with the id string. Consume the id string
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* from the buffer.
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*/
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for (i = 0; i < sizeof(authfile_id_string); i++)
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if (buffer_get_char(&buffer) != authfile_id_string[i]) {
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debug3("No RSA1 key file %.200s.", filename);
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buffer_free(&buffer);
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close(fd);
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return NULL;
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}
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/* Read cipher type. */
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cipher_type = buffer_get_char(&buffer);
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(void) buffer_get_int(&buffer); /* Reserved data. */
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/* Read the public key from the buffer. */
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buffer_get_int(&buffer);
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prv = key_new_private(KEY_RSA1);
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buffer_get_bignum(&buffer, prv->rsa->n);
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buffer_get_bignum(&buffer, prv->rsa->e);
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if (commentp)
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*commentp = buffer_get_string(&buffer, NULL);
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else
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xfree(buffer_get_string(&buffer, NULL));
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/* Check that it is a supported cipher. */
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cipher = cipher_by_number(cipher_type);
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if (cipher == NULL) {
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debug("Unsupported cipher %d used in key file %.200s.",
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cipher_type, filename);
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buffer_free(&buffer);
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goto fail;
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}
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/* Initialize space for decrypted data. */
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buffer_init(&decrypted);
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buffer_append_space(&decrypted, &cp, buffer_len(&buffer));
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/* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
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cipher_set_key_string(&ciphercontext, cipher, passphrase);
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cipher_decrypt(&ciphercontext, (u_char *) cp,
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(u_char *) buffer_ptr(&buffer), buffer_len(&buffer));
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memset(&ciphercontext, 0, sizeof(ciphercontext));
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buffer_free(&buffer);
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check1 = buffer_get_char(&decrypted);
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check2 = buffer_get_char(&decrypted);
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if (check1 != buffer_get_char(&decrypted) ||
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check2 != buffer_get_char(&decrypted)) {
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if (strcmp(passphrase, "") != 0)
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debug("Bad passphrase supplied for key file %.200s.",
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filename);
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/* Bad passphrase. */
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buffer_free(&decrypted);
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goto fail;
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}
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/* Read the rest of the private key. */
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buffer_get_bignum(&decrypted, prv->rsa->d);
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buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
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/* in SSL and SSH v1 p and q are exchanged */
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buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
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buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
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/* calculate p-1 and q-1 */
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ctx = BN_CTX_new();
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aux = BN_new();
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BN_sub(aux, prv->rsa->q, BN_value_one());
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BN_mod(prv->rsa->dmq1, prv->rsa->d, aux, ctx);
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BN_sub(aux, prv->rsa->p, BN_value_one());
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BN_mod(prv->rsa->dmp1, prv->rsa->d, aux, ctx);
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BN_clear_free(aux);
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BN_CTX_free(ctx);
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buffer_free(&decrypted);
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close(fd);
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return prv;
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fail:
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if (commentp)
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xfree(*commentp);
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close(fd);
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key_free(prv);
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return NULL;
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}
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Key *
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key_load_private_pem(int fd, int type, const char *passphrase,
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char **commentp)
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{
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FILE *fp;
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EVP_PKEY *pk = NULL;
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Key *prv = NULL;
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char *name = "<no key>";
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fp = fdopen(fd, "r");
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if (fp == NULL) {
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error("fdopen failed: %s", strerror(errno));
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close(fd);
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return NULL;
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}
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pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
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if (pk == NULL) {
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debug("PEM_read_PrivateKey failed");
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(void)ERR_get_error();
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} else if (pk->type == EVP_PKEY_RSA &&
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(type == KEY_UNSPEC||type==KEY_RSA)) {
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prv = key_new(KEY_UNSPEC);
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prv->rsa = EVP_PKEY_get1_RSA(pk);
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prv->type = KEY_RSA;
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name = "rsa w/o comment";
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#ifdef DEBUG_PK
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RSA_print_fp(stderr, prv->rsa, 8);
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#endif
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} else if (pk->type == EVP_PKEY_DSA &&
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(type == KEY_UNSPEC||type==KEY_DSA)) {
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prv = key_new(KEY_UNSPEC);
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prv->dsa = EVP_PKEY_get1_DSA(pk);
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prv->type = KEY_DSA;
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name = "dsa w/o comment";
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#ifdef DEBUG_PK
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DSA_print_fp(stderr, prv->dsa, 8);
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#endif
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} else {
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error("PEM_read_PrivateKey: mismatch or "
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"unknown EVP_PKEY save_type %d", pk->save_type);
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}
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fclose(fp);
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if (pk != NULL)
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EVP_PKEY_free(pk);
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if (prv != NULL && commentp)
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*commentp = xstrdup(name);
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debug("read PEM private key done: type %s",
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prv ? key_type(prv) : "<unknown>");
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return prv;
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}
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int
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key_perm_ok(int fd, const char *filename)
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{
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struct stat st;
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/* check owner and modes */
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if (fstat(fd, &st) < 0 ||
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(st.st_uid != 0 && getuid() != 0 && st.st_uid != getuid()) ||
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(st.st_mode & 077) != 0) {
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close(fd);
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error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
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error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
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error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
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|
error("Bad ownership or mode(0%3.3o) for '%s'.",
|
|
st.st_mode & 0777, filename);
|
|
error("It is recommended that your private key files are NOT accessible by others.");
|
|
error("This private key will be ignored.");
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
Key *
|
|
key_load_private_type(int type, const char *filename, const char *passphrase,
|
|
char **commentp)
|
|
{
|
|
int fd;
|
|
|
|
fd = open(filename, O_RDONLY);
|
|
if (fd < 0)
|
|
return NULL;
|
|
if (!key_perm_ok(fd, filename)) {
|
|
error("bad permissions: ignore key: %s", filename);
|
|
close(fd);
|
|
return NULL;
|
|
}
|
|
switch (type) {
|
|
case KEY_RSA1:
|
|
return key_load_private_rsa1(fd, filename, passphrase,
|
|
commentp);
|
|
/* closes fd */
|
|
break;
|
|
case KEY_DSA:
|
|
case KEY_RSA:
|
|
case KEY_UNSPEC:
|
|
return key_load_private_pem(fd, type, passphrase, commentp);
|
|
/* closes fd */
|
|
break;
|
|
default:
|
|
close(fd);
|
|
break;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
Key *
|
|
key_load_private(const char *filename, const char *passphrase,
|
|
char **commentp)
|
|
{
|
|
Key *pub;
|
|
int fd;
|
|
|
|
fd = open(filename, O_RDONLY);
|
|
if (fd < 0)
|
|
return NULL;
|
|
if (!key_perm_ok(fd, filename)) {
|
|
error("bad permissions: ignore key: %s", filename);
|
|
close(fd);
|
|
return NULL;
|
|
}
|
|
pub = key_load_public_rsa1(fd, filename, commentp);
|
|
lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
|
|
if (pub == NULL) {
|
|
/* closes fd */
|
|
return key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
|
|
} else {
|
|
/* it's a SSH v1 key if the public key part is readable */
|
|
key_free(pub);
|
|
/* closes fd */
|
|
return key_load_private_rsa1(fd, filename, passphrase, NULL);
|
|
}
|
|
}
|
|
|
|
int
|
|
key_try_load_public(Key *k, const char *filename, char **commentp)
|
|
{
|
|
FILE *f;
|
|
char line[4096];
|
|
char *cp;
|
|
|
|
f = fopen(filename, "r");
|
|
if (f != NULL) {
|
|
while (fgets(line, sizeof(line), f)) {
|
|
line[sizeof(line)-1] = '\0';
|
|
cp = line;
|
|
switch(*cp){
|
|
case '#':
|
|
case '\n':
|
|
case '\0':
|
|
continue;
|
|
}
|
|
/* Skip leading whitespace. */
|
|
for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
|
|
;
|
|
if (*cp) {
|
|
if (key_read(k, &cp) == 1) {
|
|
if (commentp)
|
|
*commentp=xstrdup(filename);
|
|
fclose(f);
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
fclose(f);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* load public key from ssh v1 private or any pubkey file */
|
|
Key *
|
|
key_load_public(const char *filename, char **commentp)
|
|
{
|
|
Key *pub;
|
|
char file[MAXPATHLEN];
|
|
|
|
pub = key_load_public_type(KEY_RSA1, filename, commentp);
|
|
if (pub != NULL)
|
|
return pub;
|
|
pub = key_new(KEY_UNSPEC);
|
|
if (key_try_load_public(pub, filename, commentp) == 1)
|
|
return pub;
|
|
if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
|
|
(strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
|
|
(key_try_load_public(pub, file, commentp) == 1))
|
|
return pub;
|
|
key_free(pub);
|
|
return NULL;
|
|
}
|