1999-10-27 03:42:43 +00:00
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/*
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1999-11-24 13:26:21 +00:00
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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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2000-04-16 01:18:38 +00:00
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*
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2000-09-16 02:29:08 +00:00
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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) 1999 Niels Provos. 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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2000-04-16 01:18:38 +00:00
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*
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2000-09-16 02:29:08 +00:00
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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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*
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* Description of the RSA algorithm can be found e.g. from the following
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* sources:
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2000-04-16 01:18:38 +00:00
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*
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1999-11-24 13:26:21 +00:00
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* Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1994.
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2000-04-16 01:18:38 +00:00
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*
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1999-11-24 13:26:21 +00:00
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* Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to
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* Computer Security. Prentice-Hall, 1989.
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2000-04-16 01:18:38 +00:00
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*
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1999-11-24 13:26:21 +00:00
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* Man Young Rhee: Cryptography and Secure Data Communications. McGraw-Hill,
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* 1994.
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2000-04-16 01:18:38 +00:00
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*
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1999-11-24 13:26:21 +00:00
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* R. Rivest, A. Shamir, and L. M. Adleman: Cryptographic Communications
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* System and Method. US Patent 4,405,829, 1983.
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2000-04-16 01:18:38 +00:00
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*
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1999-11-24 13:26:21 +00:00
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* Hans Riesel: Prime Numbers and Computer Methods for Factorization.
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* Birkhauser, 1994.
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2000-04-16 01:18:38 +00:00
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*
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2000-09-16 02:29:08 +00:00
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* The RSA Frequently Asked Questions document by RSA Data Security,
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* Inc., 1995.
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2000-04-16 01:18:38 +00:00
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*
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2000-09-16 02:29:08 +00:00
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* RSA in 3 lines of perl by Adam Back <aba@atlax.ex.ac.uk>, 1995, as
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* included below:
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2000-04-16 01:18:38 +00:00
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*
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1999-11-24 13:26:21 +00:00
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* [gone - had to be deleted - what a pity]
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2000-09-16 02:29:08 +00:00
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*/
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1999-10-27 03:42:43 +00:00
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#include "includes.h"
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2000-09-16 02:29:08 +00:00
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RCSID("$OpenBSD: rsa.c,v 1.16 2000/09/07 20:27:53 deraadt Exp $");
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1999-10-27 03:42:43 +00:00
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#include "rsa.h"
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#include "ssh.h"
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#include "xmalloc.h"
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2000-04-03 04:50:43 +00:00
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#include "entropy.h"
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1999-10-27 03:42:43 +00:00
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int rsa_verbose = 1;
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int
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rsa_alive()
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{
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1999-11-24 13:26:21 +00:00
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RSA *key;
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1999-10-27 03:42:43 +00:00
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2000-03-05 05:10:45 +00:00
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seed_rng();
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1999-11-24 13:26:21 +00:00
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key = RSA_generate_key(32, 3, NULL, NULL);
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if (key == NULL)
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return (0);
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RSA_free(key);
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return (1);
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1999-10-27 03:42:43 +00:00
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}
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1999-12-17 03:02:47 +00:00
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/*
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* Key generation progress meter callback
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*/
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void
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keygen_progress(int p, int n, void *arg)
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{
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const char progress_chars[] = ".o+O?";
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if ((p < 0) || (p > (sizeof(progress_chars) - 2)))
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2000-01-29 09:40:22 +00:00
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p = sizeof(progress_chars) - 2;
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1999-12-17 03:02:47 +00:00
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2000-01-29 09:40:22 +00:00
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putchar(progress_chars[p]);
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1999-12-17 03:02:47 +00:00
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fflush(stdout);
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}
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1999-11-25 00:54:57 +00:00
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/*
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* Generates RSA public and private keys. This initializes the data
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* structures; they should be freed with rsa_clear_private_key and
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* rsa_clear_public_key.
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*/
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1999-10-27 03:42:43 +00:00
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void
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rsa_generate_key(RSA *prv, RSA *pub, unsigned int bits)
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{
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1999-11-24 13:26:21 +00:00
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RSA *key;
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2000-01-29 09:40:22 +00:00
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seed_rng();
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1999-11-24 13:26:21 +00:00
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if (rsa_verbose) {
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printf("Generating RSA keys: ");
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fflush(stdout);
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1999-12-17 03:02:47 +00:00
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key = RSA_generate_key(bits, 35, keygen_progress, NULL);
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printf("\n");
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} else {
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key = RSA_generate_key(bits, 35, NULL, NULL);
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1999-11-24 13:26:21 +00:00
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}
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if (key == NULL)
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fatal("rsa_generate_key: key generation failed.");
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/* Copy public key parameters */
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pub->n = BN_new();
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BN_copy(pub->n, key->n);
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pub->e = BN_new();
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BN_copy(pub->e, key->e);
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/* Copy private key parameters */
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prv->n = BN_new();
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BN_copy(prv->n, key->n);
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prv->e = BN_new();
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BN_copy(prv->e, key->e);
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prv->d = BN_new();
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BN_copy(prv->d, key->d);
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prv->p = BN_new();
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BN_copy(prv->p, key->p);
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prv->q = BN_new();
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BN_copy(prv->q, key->q);
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prv->dmp1 = BN_new();
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BN_copy(prv->dmp1, key->dmp1);
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prv->dmq1 = BN_new();
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BN_copy(prv->dmq1, key->dmq1);
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prv->iqmp = BN_new();
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BN_copy(prv->iqmp, key->iqmp);
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RSA_free(key);
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if (rsa_verbose)
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printf("Key generation complete.\n");
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1999-10-27 03:42:43 +00:00
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}
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void
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1999-11-24 13:26:21 +00:00
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rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA *key)
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1999-10-27 03:42:43 +00:00
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{
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2000-03-17 12:40:15 +00:00
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unsigned char *inbuf, *outbuf;
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1999-11-24 13:26:21 +00:00
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int len, ilen, olen;
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1999-10-27 03:42:43 +00:00
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1999-11-24 13:26:21 +00:00
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if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e))
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fatal("rsa_public_encrypt() exponent too small or not odd");
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1999-10-27 03:42:43 +00:00
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1999-11-24 13:26:21 +00:00
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olen = BN_num_bytes(key->n);
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outbuf = xmalloc(olen);
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1999-10-27 03:42:43 +00:00
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1999-11-24 13:26:21 +00:00
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ilen = BN_num_bytes(in);
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inbuf = xmalloc(ilen);
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BN_bn2bin(in, inbuf);
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1999-10-27 03:42:43 +00:00
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1999-11-24 13:26:21 +00:00
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if ((len = RSA_public_encrypt(ilen, inbuf, outbuf, key,
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- OpenBSD CVS updates to v1.2.3
[ssh.h atomicio.c]
- int atomicio -> ssize_t (for alpha). ok deraadt@
[auth-rsa.c]
- delay MD5 computation until client sends response, free() early, cleanup.
[cipher.c]
- void* -> unsigned char*, ok niels@
[hostfile.c]
- remove unused variable 'len'. fix comments.
- remove unused variable
[log-client.c log-server.c]
- rename a cpp symbol, to avoid param.h collision
[packet.c]
- missing xfree()
- getsockname() requires initialized tolen; andy@guildsoftware.com
- use getpeername() in packet_connection_is_on_socket(), fixes sshd -i;
from Holger.Trapp@Informatik.TU-Chemnitz.DE
[pty.c pty.h]
- register cleanup for pty earlier. move code for pty-owner handling to
pty.c ok provos@, dugsong@
[readconf.c]
- turn off x11-fwd for the client, too.
[rsa.c]
- PKCS#1 padding
[scp.c]
- allow '.' in usernames; from jedgar@fxp.org
[servconf.c]
- typo: ignore_user_known_hosts int->flag; naddy@mips.rhein-neckar.de
- sync with sshd_config
[ssh-keygen.c]
- enable ssh-keygen -l -f ~/.ssh/known_hosts, ok deraadt@
[ssh.1]
- Change invalid 'CHAT' loglevel to 'VERBOSE'
[ssh.c]
- suppress AAAA query host when '-4' is used; from shin@nd.net.fujitsu.co.jp
- turn off x11-fwd for the client, too.
[sshconnect.c]
- missing xfree()
- retry rresvport_af(), too. from sumikawa@ebina.hitachi.co.jp.
- read error vs. "Connection closed by remote host"
[sshd.8]
- ie. -> i.e.,
- do not link to a commercial page..
- sync with sshd_config
[sshd.c]
- no need for poll.h; from bright@wintelcom.net
- log with level log() not fatal() if peer behaves badly.
- don't panic if client behaves strange. ok deraadt@
- make no-port-forwarding for RSA keys deny both -L and -R style fwding
- delay close() of pty until the pty has been chowned back to root
- oops, fix comment, too.
- missing xfree()
- move XAUTHORITY to subdir. ok dugsong@. fixes debian bug #57907, too.
(http://cgi.debian.org/cgi-bin/bugreport.cgi?archive=no&bug=57907)
- register cleanup for pty earlier. move code for pty-owner handling to
pty.c ok provos@, dugsong@
- create x11 cookie file
- fix pr 1113, fclose() -> pclose(), todo: remote popen()
- version 1.2.3
- Cleaned up
2000-03-09 10:27:49 +00:00
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RSA_PKCS1_PADDING)) <= 0)
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1999-11-24 13:26:21 +00:00
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fatal("rsa_public_encrypt() failed");
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1999-10-27 03:42:43 +00:00
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1999-11-24 13:26:21 +00:00
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BN_bin2bn(outbuf, len, out);
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1999-10-27 03:42:43 +00:00
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1999-11-24 13:26:21 +00:00
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memset(outbuf, 0, olen);
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memset(inbuf, 0, ilen);
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xfree(outbuf);
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xfree(inbuf);
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1999-10-27 03:42:43 +00:00
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}
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void
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rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key)
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{
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2000-03-17 12:40:15 +00:00
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unsigned char *inbuf, *outbuf;
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1999-11-24 13:26:21 +00:00
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int len, ilen, olen;
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1999-10-27 03:42:43 +00:00
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1999-11-24 13:26:21 +00:00
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olen = BN_num_bytes(key->n);
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outbuf = xmalloc(olen);
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1999-10-27 03:42:43 +00:00
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1999-11-24 13:26:21 +00:00
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ilen = BN_num_bytes(in);
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inbuf = xmalloc(ilen);
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BN_bn2bin(in, inbuf);
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1999-10-27 03:42:43 +00:00
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1999-11-24 13:26:21 +00:00
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if ((len = RSA_private_decrypt(ilen, inbuf, outbuf, key,
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- OpenBSD CVS updates to v1.2.3
[ssh.h atomicio.c]
- int atomicio -> ssize_t (for alpha). ok deraadt@
[auth-rsa.c]
- delay MD5 computation until client sends response, free() early, cleanup.
[cipher.c]
- void* -> unsigned char*, ok niels@
[hostfile.c]
- remove unused variable 'len'. fix comments.
- remove unused variable
[log-client.c log-server.c]
- rename a cpp symbol, to avoid param.h collision
[packet.c]
- missing xfree()
- getsockname() requires initialized tolen; andy@guildsoftware.com
- use getpeername() in packet_connection_is_on_socket(), fixes sshd -i;
from Holger.Trapp@Informatik.TU-Chemnitz.DE
[pty.c pty.h]
- register cleanup for pty earlier. move code for pty-owner handling to
pty.c ok provos@, dugsong@
[readconf.c]
- turn off x11-fwd for the client, too.
[rsa.c]
- PKCS#1 padding
[scp.c]
- allow '.' in usernames; from jedgar@fxp.org
[servconf.c]
- typo: ignore_user_known_hosts int->flag; naddy@mips.rhein-neckar.de
- sync with sshd_config
[ssh-keygen.c]
- enable ssh-keygen -l -f ~/.ssh/known_hosts, ok deraadt@
[ssh.1]
- Change invalid 'CHAT' loglevel to 'VERBOSE'
[ssh.c]
- suppress AAAA query host when '-4' is used; from shin@nd.net.fujitsu.co.jp
- turn off x11-fwd for the client, too.
[sshconnect.c]
- missing xfree()
- retry rresvport_af(), too. from sumikawa@ebina.hitachi.co.jp.
- read error vs. "Connection closed by remote host"
[sshd.8]
- ie. -> i.e.,
- do not link to a commercial page..
- sync with sshd_config
[sshd.c]
- no need for poll.h; from bright@wintelcom.net
- log with level log() not fatal() if peer behaves badly.
- don't panic if client behaves strange. ok deraadt@
- make no-port-forwarding for RSA keys deny both -L and -R style fwding
- delay close() of pty until the pty has been chowned back to root
- oops, fix comment, too.
- missing xfree()
- move XAUTHORITY to subdir. ok dugsong@. fixes debian bug #57907, too.
(http://cgi.debian.org/cgi-bin/bugreport.cgi?archive=no&bug=57907)
- register cleanup for pty earlier. move code for pty-owner handling to
pty.c ok provos@, dugsong@
- create x11 cookie file
- fix pr 1113, fclose() -> pclose(), todo: remote popen()
- version 1.2.3
- Cleaned up
2000-03-09 10:27:49 +00:00
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RSA_PKCS1_PADDING)) <= 0)
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1999-11-24 13:26:21 +00:00
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fatal("rsa_private_decrypt() failed");
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1999-10-27 03:42:43 +00:00
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1999-11-24 13:26:21 +00:00
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BN_bin2bn(outbuf, len, out);
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1999-10-27 03:42:43 +00:00
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1999-11-24 13:26:21 +00:00
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memset(outbuf, 0, olen);
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memset(inbuf, 0, ilen);
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xfree(outbuf);
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xfree(inbuf);
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1999-10-27 03:42:43 +00:00
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}
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/* Set whether to output verbose messages during key generation. */
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void
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rsa_set_verbose(int verbose)
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{
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1999-11-24 13:26:21 +00:00
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rsa_verbose = verbose;
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1999-10-27 03:42:43 +00:00
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}
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