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- markus@cvs.openbsd.org 2000/09/05 02:59:57 [session.c] print hostname (not hushlogin) - markus@cvs.openbsd.org 2000/09/05 13:18:48 [authfile.c ssh-add.c] enable ssh-add -d for DSA keys - markus@cvs.openbsd.org 2000/09/05 13:20:49 [sftp-server.c] cleanup - markus@cvs.openbsd.org 2000/09/06 03:46:41 [authfile.h] prototype - deraadt@cvs.openbsd.org 2000/09/07 14:27:56 [ALL] cleanup copyright notices on all files. I have attempted to be accurate with the details. everything is now under Tatu's licence (which I copied from his readme), and/or the core-sdi bsd-ish thing for deattack, or various openbsd developers under a 2-term bsd licence. We're not changing any rules, just being accurate. - markus@cvs.openbsd.org 2000/09/07 14:40:30 [channels.c channels.h clientloop.c serverloop.c ssh.c] cleanup window and packet sizes for ssh2 flow control; ok niels - markus@cvs.openbsd.org 2000/09/07 14:53:00 [scp.c] typo - markus@cvs.openbsd.org 2000/09/07 15:13:37 [auth-options.c auth-options.h auth-rh-rsa.c auth-rsa.c auth.c] [authfile.h canohost.c channels.h compat.c hostfile.h log.c match.h] [pty.c readconf.c] some more Copyright fixes - markus@cvs.openbsd.org 2000/09/08 03:02:51 [README.openssh2] bye bye - deraadt@cvs.openbsd.org 2000/09/11 18:38:33 [LICENCE cipher.c] a few more comments about it being ARC4 not RC4 - markus@cvs.openbsd.org 2000/09/12 14:53:11 [log-client.c log-server.c log.c ssh.1 ssh.c ssh.h sshd.8 sshd.c] multiple debug levels - markus@cvs.openbsd.org 2000/09/14 14:25:15 [clientloop.c] typo - deraadt@cvs.openbsd.org 2000/09/15 01:13:51 [ssh-agent.c] check return value for setenv(3) for failure, and deal appropriately
576 lines
15 KiB
C
576 lines
15 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 1.19 2000/09/07 20:27:49 deraadt Exp $");
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#include <openssl/bn.h>
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#include <openssl/dsa.h>
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#include <openssl/rsa.h>
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#include <openssl/pem.h>
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#include <openssl/evp.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 "cipher.h"
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#include "ssh.h"
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#include "key.h"
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/* Version identification string for identity files. */
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#define AUTHFILE_ID_STRING "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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save_private_key_rsa(const char *filename, const char *passphrase,
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RSA *key, 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 cipher;
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int cipher_type;
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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_type = SSH_CIPHER_NONE;
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else
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cipher_type = SSH_AUTHFILE_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->d);
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buffer_put_bignum(&buffer, key->iqmp);
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buffer_put_bignum(&buffer, key->q); /* reverse from SSL p */
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buffer_put_bignum(&buffer, key->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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cp = AUTHFILE_ID_STRING;
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for (i = 0; cp[i]; i++)
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buffer_put_char(&encrypted, cp[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_type);
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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->n));
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buffer_put_bignum(&encrypted, key->n);
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buffer_put_bignum(&encrypted, key->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(&cipher, cipher_type, passphrase);
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cipher_encrypt(&cipher, (unsigned char *) cp,
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(unsigned char *) buffer_ptr(&buffer),
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buffer_len(&buffer));
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memset(&cipher, 0, sizeof(cipher));
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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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return 0;
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if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
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buffer_len(&encrypted)) {
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debug("Write to key file %.200s failed: %.100s", filename,
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strerror(errno));
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buffer_free(&encrypted);
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close(fd);
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remove(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 DSA key in OpenSSL PEM format */
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int
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save_private_key_dsa(const char *filename, const char *passphrase,
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DSA *dsa, 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 = 1;
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int len = strlen(passphrase);
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if (len > 0 && len <= 4) {
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error("passphrase too short: %d bytes", len);
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errno = 0;
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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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debug("open %s failed", filename);
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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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debug("fdopen %s failed", filename);
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close(fd);
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return 0;
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}
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if (len > 0) {
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if (!PEM_write_DSAPrivateKey(fp, dsa, EVP_des_ede3_cbc(),
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(char *)passphrase, strlen(passphrase), NULL, NULL))
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success = 0;
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} else {
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if (!PEM_write_DSAPrivateKey(fp, dsa, NULL,
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NULL, 0, NULL, NULL))
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success = 0;
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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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save_private_key(const char *filename, const char *passphrase, Key *key,
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const char *comment)
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{
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switch (key->type) {
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case KEY_RSA:
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return save_private_key_rsa(filename, passphrase, key->rsa, comment);
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break;
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case KEY_DSA:
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return save_private_key_dsa(filename, passphrase, key->dsa, comment);
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break;
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default:
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break;
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}
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return 0;
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}
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/*
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* Loads the public part of the key file. Returns 0 if an error was
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* encountered (the file does not exist or is not readable), and non-zero
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* otherwise.
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*/
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int
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load_public_key_rsa(const char *filename, RSA * pub, char **comment_return)
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{
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int fd, i;
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off_t len;
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Buffer buffer;
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char *cp;
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fd = open(filename, O_RDONLY);
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if (fd < 0)
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return 0;
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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 0;
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}
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close(fd);
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/* Check that it is at least big enought to contain the ID string. */
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if (len < strlen(AUTHFILE_ID_STRING) + 1) {
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debug("Bad key file %.200s.", filename);
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buffer_free(&buffer);
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return 0;
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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 < (unsigned int) strlen(AUTHFILE_ID_STRING) + 1; i++)
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if (buffer_get_char(&buffer) != (u_char) AUTHFILE_ID_STRING[i]) {
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debug("Bad key file %.200s.", filename);
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buffer_free(&buffer);
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return 0;
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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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/* XXX alloc */
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if (pub->n == NULL)
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pub->n = BN_new();
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buffer_get_bignum(&buffer, pub->n);
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/* XXX alloc */
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if (pub->e == NULL)
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pub->e = BN_new();
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buffer_get_bignum(&buffer, pub->e);
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if (comment_return)
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*comment_return = 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 1;
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}
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/* load public key from private-key file */
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int
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load_public_key(const char *filename, Key * key, char **comment_return)
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{
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switch (key->type) {
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case KEY_RSA:
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return load_public_key_rsa(filename, key->rsa, comment_return);
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break;
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case KEY_DSA:
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default:
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break;
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}
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return 0;
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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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int
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load_private_key_rsa(int fd, const char *filename,
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const char *passphrase, RSA * prv, char **comment_return)
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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 cipher;
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BN_CTX *ctx;
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BIGNUM *aux;
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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 0;
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}
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close(fd);
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/* Check that it is at least big enought to contain the ID string. */
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if (len < strlen(AUTHFILE_ID_STRING) + 1) {
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debug("Bad key file %.200s.", filename);
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buffer_free(&buffer);
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return 0;
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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 < (unsigned int) strlen(AUTHFILE_ID_STRING) + 1; i++)
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if (buffer_get_char(&buffer) != (unsigned char) AUTHFILE_ID_STRING[i]) {
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debug("Bad key file %.200s.", filename);
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buffer_free(&buffer);
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return 0;
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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->n = BN_new();
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buffer_get_bignum(&buffer, prv->n);
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prv->e = BN_new();
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buffer_get_bignum(&buffer, prv->e);
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if (comment_return)
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*comment_return = 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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if (((cipher_mask1() | SSH_CIPHER_NONE | SSH_AUTHFILE_CIPHER) &
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(1 << cipher_type)) == 0) {
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debug("Unsupported cipher %.100s used in key file %.200s.",
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cipher_name(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(&cipher, cipher_type, passphrase);
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cipher_decrypt(&cipher, (unsigned char *) cp,
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(unsigned char *) buffer_ptr(&buffer),
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buffer_len(&buffer));
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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.", filename);
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/* Bad passphrase. */
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buffer_free(&decrypted);
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fail:
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BN_clear_free(prv->n);
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prv->n = NULL;
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BN_clear_free(prv->e);
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prv->e = NULL;
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if (comment_return)
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xfree(*comment_return);
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return 0;
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}
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/* Read the rest of the private key. */
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prv->d = BN_new();
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buffer_get_bignum(&decrypted, prv->d);
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prv->iqmp = BN_new();
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buffer_get_bignum(&decrypted, prv->iqmp); /* u */
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/* in SSL and SSH p and q are exchanged */
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prv->q = BN_new();
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buffer_get_bignum(&decrypted, prv->q); /* p */
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prv->p = BN_new();
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buffer_get_bignum(&decrypted, prv->p); /* q */
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ctx = BN_CTX_new();
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aux = BN_new();
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BN_sub(aux, prv->q, BN_value_one());
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prv->dmq1 = BN_new();
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BN_mod(prv->dmq1, prv->d, aux, ctx);
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BN_sub(aux, prv->p, BN_value_one());
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prv->dmp1 = BN_new();
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BN_mod(prv->dmp1, prv->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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return 1;
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}
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int
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load_private_key_dsa(int fd, const char *passphrase, Key *k, char **comment_return)
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{
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DSA *dsa;
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BIO *in;
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FILE *fp;
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in = BIO_new(BIO_s_file());
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if (in == NULL) {
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error("BIO_new failed");
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return 0;
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}
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fp = fdopen(fd, "r");
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if (fp == NULL) {
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error("fdopen failed");
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return 0;
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}
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BIO_set_fp(in, fp, BIO_NOCLOSE);
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dsa = PEM_read_bio_DSAPrivateKey(in, NULL, NULL, (char *)passphrase);
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if (dsa == NULL) {
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debug("PEM_read_bio_DSAPrivateKey failed");
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} else {
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/* replace k->dsa with loaded key */
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DSA_free(k->dsa);
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k->dsa = dsa;
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}
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BIO_free(in);
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fclose(fp);
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if (comment_return)
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*comment_return = xstrdup("dsa w/o comment");
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debug("read DSA private key done");
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#ifdef DEBUG_DSS
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DSA_print_fp(stderr, dsa, 8);
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#endif
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return dsa != NULL ? 1 : 0;
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}
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|
|
|
int
|
|
load_private_key(const char *filename, const char *passphrase, Key *key,
|
|
char **comment_return)
|
|
{
|
|
int fd;
|
|
int ret = 0;
|
|
struct stat st;
|
|
|
|
fd = open(filename, O_RDONLY);
|
|
if (fd < 0)
|
|
return 0;
|
|
|
|
#ifndef HAVE_CYGWIN
|
|
/*
|
|
* check owner and modes.
|
|
* This won't work on Windows under all circumstances so we drop
|
|
* that check for now.
|
|
*/
|
|
if (fstat(fd, &st) < 0 ||
|
|
(st.st_uid != 0 && st.st_uid != getuid()) ||
|
|
(st.st_mode & 077) != 0) {
|
|
close(fd);
|
|
error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
|
|
error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
|
|
error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
|
|
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.");
|
|
return 0;
|
|
}
|
|
#endif
|
|
switch (key->type) {
|
|
case KEY_RSA:
|
|
if (key->rsa->e != NULL) {
|
|
BN_clear_free(key->rsa->e);
|
|
key->rsa->e = NULL;
|
|
}
|
|
if (key->rsa->n != NULL) {
|
|
BN_clear_free(key->rsa->n);
|
|
key->rsa->n = NULL;
|
|
}
|
|
ret = load_private_key_rsa(fd, filename, passphrase,
|
|
key->rsa, comment_return);
|
|
break;
|
|
case KEY_DSA:
|
|
ret = load_private_key_dsa(fd, passphrase, key, comment_return);
|
|
default:
|
|
break;
|
|
}
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
do_load_public_key(const char *filename, Key *k, char **commentp)
|
|
{
|
|
FILE *f;
|
|
unsigned int bits;
|
|
char line[1024];
|
|
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) {
|
|
bits = key_read(k, &cp);
|
|
if (bits != 0) {
|
|
if (commentp)
|
|
*commentp=xstrdup(filename);
|
|
fclose(f);
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
fclose(f);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* load public key from pubkey file */
|
|
int
|
|
try_load_public_key(const char *filename, Key *k, char **commentp)
|
|
{
|
|
char pub[MAXPATHLEN];
|
|
|
|
if (do_load_public_key(filename, k, commentp) == 1)
|
|
return 1;
|
|
if (strlcpy(pub, filename, sizeof pub) >= MAXPATHLEN)
|
|
return 0;
|
|
if (strlcat(pub, ".pub", sizeof pub) >= MAXPATHLEN)
|
|
return 0;
|
|
if (do_load_public_key(pub, k, commentp) == 1)
|
|
return 1;
|
|
return 0;
|
|
}
|