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/* $OpenBSD: key.c,v 1.6 2010/08/11 18:38:30 jasper Exp $ */
/*
* key.c
*
* Copyright (c) 2001 Dug Song <dugsong@arbor.net>
* Copyright (c) 2001 Arbor Networks, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The names of the copyright holders may not be used to endorse or
* promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Vendor: key.c,v 1.2 2005/04/01 16:47:31 dugsong Exp $
*/
#include <sys/limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <openssl/ssl.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "key.h"
#include "ssh.h"
#include "ssh2.h"
#include "util.h"
#include "x509.h"
typedef int (*key_loader)(struct key *, struct iovec *);
static key_loader pubkey_loaders[] = {
ssh_load_public,
ssh2_load_public,
x509_load_public,
NULL
};
static key_loader privkey_loaders[] = {
ssh_load_private,
x509_load_private,
NULL
};
static int
load_file(struct iovec *iov, char *filename)
{
struct stat st;
int fd;
int rval = -1;
if ((fd = open(filename, O_RDONLY)) < 0)
goto done;
if (fstat(fd, &st) < 0)
goto done;
if (st.st_size == 0 || st.st_size >= SIZE_MAX) {
errno = EINVAL;
goto done;
}
if ((iov->iov_base = malloc(st.st_size + 1)) == NULL)
goto done;
iov->iov_len = st.st_size;
((u_char *)iov->iov_base)[iov->iov_len] = '\0';
if (read(fd, iov->iov_base, iov->iov_len) != iov->iov_len) {
free(iov->iov_base);
goto done;
}
rval = 0;
done:
if (fd != -1)
close(fd);
return (rval);
}
struct key *
key_new(void)
{
return (calloc(1, sizeof(struct key)));
}
int
key_load_private(struct key *k, char *filename)
{
struct iovec iov;
int i;
if (load_file(&iov, filename) < 0)
return (-1);
for (i = 0; privkey_loaders[i] != NULL; i++) {
if (privkey_loaders[i](k, &iov) == 0)
return (0);
}
return (-1);
}
int
key_load_public(struct key *k, char *filename)
{
struct iovec iov;
int i;
if (load_file(&iov, filename) < 0)
return (-1);
for (i = 0; pubkey_loaders[i] != NULL; i++) {
if (pubkey_loaders[i](k, &iov) == 0)
return (0);
}
return (-1);
}
int
key_sign(struct key *k, u_char *msg, int mlen, u_char *sig, int slen)
{
switch (k->type) {
case KEY_RSA:
if (RSA_size((RSA *)k->data) > slen) {
fprintf(stderr, "RSA modulus too large: %d bits\n",
RSA_size((RSA *)k->data));
return (-1);
}
if (RSA_sign(NID_sha1, msg, mlen, sig, &slen,
(RSA *)k->data) <= 0) {
fprintf(stderr, "RSA signing failed\n");
return (-1);
}
break;
case KEY_DSA:
if (DSA_size((DSA *)k->data) > slen) {
fprintf(stderr, "DSA signature size too large: "
"%d bits\n", DSA_size((DSA *)k->data));
return (-1);
}
if (DSA_sign(NID_sha1, msg, mlen, sig, &slen,
(DSA *)k->data) <= 0) {
fprintf(stderr, "DSA signing failed\n");
return (-1);
}
break;
default:
fprintf(stderr, "Unknown key type: %d\n", k->type);
return (-1);
}
return (slen);
}
int
key_verify(struct key *k, u_char *msg, int mlen, u_char *sig, int slen)
{
switch (k->type) {
case KEY_RSA:
if (RSA_verify(NID_sha1, msg, mlen,
sig, slen, (RSA *)k->data) <= 0) {
fprintf(stderr, "RSA verification failed\n");
return (-1);
}
break;
case KEY_DSA:
if (DSA_verify(NID_sha1, msg, mlen,
sig, slen, (DSA *)k->data) <= 0) {
fprintf(stderr, "DSA verification failed\n");
return (-1);
}
break;
default:
fprintf(stderr, "Unknown key type: %d\n", k->type);
return (-1);
}
return (slen);
}
void
key_free(struct key *k)
{
if (k->type == KEY_RSA)
RSA_free((RSA *)k->data);
else if (k->type == KEY_DSA)
DSA_free((DSA *)k->data);
else if (k->data != NULL)
free(k->data);
free(k);
}
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