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/* $OpenBSD: ssl_smtpd.c,v 1.7 2014/04/29 19:13:14 reyk Exp $ */
/*
* Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
* Copyright (c) 2008 Reyk Floeter <reyk@openbsd.org>
* Copyright (c) 2012 Gilles Chehade <gilles@poolp.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <ctype.h>
#include <event.h>
#include <fcntl.h>
#include <imsg.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <openssl/ssl.h>
#include <openssl/engine.h>
#include <openssl/err.h>
#include "smtpd.h"
#include "log.h"
#include "ssl.h"
void *
ssl_mta_init(void *pkiname, char *cert, off_t cert_len)
{
SSL_CTX *ctx = NULL;
SSL *ssl = NULL;
ctx = ssl_ctx_create(pkiname, cert, cert_len);
if ((ssl = SSL_new(ctx)) == NULL)
goto err;
if (!SSL_set_ssl_method(ssl, SSLv23_client_method()))
goto err;
SSL_CTX_free(ctx);
return (void *)(ssl);
err:
if (ssl != NULL)
SSL_free(ssl);
if (ctx != NULL)
SSL_CTX_free(ctx);
ssl_error("ssl_mta_init");
return (NULL);
}
/* dummy_verify */
static int
dummy_verify(int ok, X509_STORE_CTX *store)
{
/*
* We *want* SMTP to request an optional client certificate, however we don't want the
* verification to take place in the SMTP process. This dummy verify will allow us to
* asynchronously verify in the lookup process.
*/
return 1;
}
void *
ssl_smtp_init(void *ssl_ctx, void *sni, void *arg)
{
SSL *ssl = NULL;
int (*cb)(SSL *,int *,void *) = sni;
log_debug("debug: session_start_ssl: switching to SSL");
SSL_CTX_set_verify(ssl_ctx, SSL_VERIFY_PEER, dummy_verify);
if (cb) {
SSL_CTX_set_tlsext_servername_callback(ssl_ctx, cb);
SSL_CTX_set_tlsext_servername_arg(ssl_ctx, arg);
}
if ((ssl = SSL_new(ssl_ctx)) == NULL)
goto err;
if (!SSL_set_ssl_method(ssl, SSLv23_server_method()))
goto err;
return (void *)(ssl);
err:
if (ssl != NULL)
SSL_free(ssl);
ssl_error("ssl_smtp_init");
return (NULL);
}
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