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/* $OpenBSD: net_ssl.c,v 1.1 2005/03/30 18:44:49 ho Exp $ */
/*
* Copyright (c) 2005 Håkan Olsson. All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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.
*/
/*
* This code was written under funding by Multicom Security AB.
*/
#include <sys/types.h>
#include <openssl/ssl.h>
#include <openssl/tls1.h>
#include <openssl/err.h>
#include <string.h>
#include "sasyncd.h"
#include "net.h"
/* Global SSL context. */
SSL_CTX *ctx;
static void net_SSL_dump_stack(int);
static void net_SSL_print_error(int, int);
int
net_SSL_init(void)
{
SSL_library_init();
SSL_load_error_strings();
ctx = SSL_CTX_new(TLSv1_method());
if (!ctx)
return -1;
(void)SSL_CTX_set_options(ctx, SSL_OP_SINGLE_DH_USE | SSL_OP_NO_SSLv2);
/* Load CA cert. */
if (!SSL_CTX_load_verify_locations(ctx, cfgstate.cafile, NULL)) {
net_SSL_dump_stack(0);
fprintf(stderr, "cannot read \"%s\": %s\n", cfgstate.cafile,
strerror(errno));
return -1;
}
/* Load our certificate. */
if (!SSL_CTX_use_certificate_chain_file(ctx, cfgstate.certfile)) {
net_SSL_dump_stack(0);
fprintf(stderr, "cannot read \"%s\": %s\n", cfgstate.certfile,
strerror(errno));
return -1;
}
/* Load and check private key. */
if (!SSL_CTX_use_PrivateKey_file(ctx, cfgstate.privkeyfile,
SSL_FILETYPE_PEM)) {
net_SSL_dump_stack(0);
if (ERR_GET_REASON(ERR_peek_error() == EVP_R_BAD_DECRYPT)) {
fprintf(stderr, "bad pass phrase\n");
return -1;
} else {
fprintf(stderr, "cannot read \"%s\": %s\n",
cfgstate.privkeyfile, strerror(errno));
return -1;
}
}
if (!SSL_CTX_check_private_key(ctx)) {
net_SSL_dump_stack(0);
fprintf(stderr, "Private key does not match certificate\n");
return -1;
}
return 0;
}
int
net_SSL_connect(struct syncpeer *p)
{
int r, err;
p->ssl = SSL_new(ctx);
if (!p->ssl)
return -1;
SSL_set_fd(p->ssl, p->socket);
r = SSL_connect(p->ssl);
if (r != 1) {
err = SSL_get_error(p->ssl, r);
net_SSL_print_error(err, r);
return -1;
}
log_msg(2, "TLS connection established with peer "
"\"%s\"", p->name);
return 0;
}
void
net_SSL_disconnect(struct syncpeer *p)
{
if (p->ssl) {
SSL_shutdown(p->ssl);
SSL_free(p->ssl);
}
p->ssl = NULL;
}
static void
net_SSL_dump_stack(int level)
{
int err;
while ((err = ERR_get_error()) != 0)
log_msg(level, "%s", ERR_error_string(err, NULL));
}
static void
net_SSL_print_error(int r, int prev)
{
char *msg;
switch (r) {
case SSL_ERROR_NONE:
msg = "SSL_ERROR_NONE";
break;
case SSL_ERROR_ZERO_RETURN:
msg = "SSL_ERROR_ZERO_RETURN";
break;
case SSL_ERROR_WANT_READ:
msg = "SSL_ERROR_WANT_READ";
break;
case SSL_ERROR_WANT_WRITE:
msg = "SSL_ERROR_WANT_WRITE";
break;
case SSL_ERROR_WANT_CONNECT:
msg = "SSL_ERROR_WANT_CONNECT";
break;
case SSL_ERROR_WANT_ACCEPT:
msg = "SSL_ERROR_WANT_ACCEPT";
break;
case SSL_ERROR_WANT_X509_LOOKUP:
msg = "SSL_ERROR_WANT_X509_LOOKUP";
break;
case SSL_ERROR_SYSCALL:
msg = "SSL_ERROR_SYSCALL";
break;
case SSL_ERROR_SSL:
msg = "SSL_ERROR_SSL";
break;
default:
msg = "<unknown error>";
break;
}
log_msg(3, "SSL: \"%s\" original code = %d", msg, prev);
net_SSL_dump_stack(3);
}
static int
net_SSL_io(struct syncpeer *p, void *buf, u_int32_t len, int writeflag)
{
int ret, e;
retry:
if (writeflag)
ret = SSL_write(p->ssl, buf, len);
else
ret = SSL_read(p->ssl, buf, len);
if (ret == (int)len)
return 0;
e = SSL_get_error(p->ssl, ret);
net_SSL_print_error(e, ret);
if (e == SSL_ERROR_WANT_READ || e == SSL_ERROR_WANT_WRITE)
goto retry; /* Enough to just retry here? XXX */
log_msg(1, "peer \"%s\" disconnected", p->name);
net_disconnect_peer(p);
return 1;
}
int
net_SSL_read(struct syncpeer *p, void *buf, u_int32_t len)
{
int r, err;
if (!p->ssl) {
p->ssl = SSL_new(ctx);
if (!p->ssl) {
log_msg(0, "SSL_new() failed");
return NULL;
}
SSL_set_fd(p->ssl, p->socket);
r = SSL_accept(p->ssl);
if (r != 1) {
err = SSL_get_error(p->ssl, r);
net_SSL_print_error(err, r);
return NULL;
}
}
return net_SSL_io(p, buf, len, 0);
}
int
net_SSL_write(struct syncpeer *p, void *buf, u_int32_t len)
{
return net_SSL_io(p, buf, len, 1);
}
void
net_SSL_shutdown(void)
{
ERR_free_strings();
SSL_CTX_free(ctx);
}
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