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/* $OpenBSD: tls_client.c,v 1.32 2015/10/09 04:13:34 deraadt Exp $ */
/*
* Copyright (c) 2014 Joel Sing <jsing@openbsd.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/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdlib.h>
#include <unistd.h>
#include <openssl/err.h>
#include <openssl/x509.h>
#include <tls.h>
#include "tls_internal.h"
struct tls *
tls_client(void)
{
struct tls *ctx;
if ((ctx = tls_new()) == NULL)
return (NULL);
ctx->flags |= TLS_CLIENT;
return (ctx);
}
int
tls_connect(struct tls *ctx, const char *host, const char *port)
{
return tls_connect_servername(ctx, host, port, NULL);
}
int
tls_connect_servername(struct tls *ctx, const char *host, const char *port,
const char *servername)
{
struct addrinfo hints, *res, *res0;
const char *h = NULL, *p = NULL;
char *hs = NULL, *ps = NULL;
int rv = -1, s = -1, ret;
if ((ctx->flags & TLS_CLIENT) == 0) {
tls_set_errorx(ctx, "not a client context");
goto err;
}
if (host == NULL) {
tls_set_errorx(ctx, "host not specified");
goto err;
}
/*
* If port is NULL try to extract a port from the specified host,
* otherwise use the default.
*/
if ((p = (char *)port) == NULL) {
ret = tls_host_port(host, &hs, &ps);
if (ret == -1) {
tls_set_errorx(ctx, "memory allocation failure");
goto err;
}
if (ret != 0) {
tls_set_errorx(ctx, "no port provided");
goto err;
}
}
h = (hs != NULL) ? hs : host;
p = (ps != NULL) ? ps : port;
/*
* First check if the host is specified as a numeric IP address,
* either IPv4 or IPv6, before trying to resolve the host.
* The AI_ADDRCONFIG resolver option will not return IPv4 or IPv6
* records if it is not configured on an interface; not considering
* loopback addresses. Checking the numeric addresses first makes
* sure that connection attempts to numeric addresses and especially
* 127.0.0.1 or ::1 loopback addresses are always possible.
*/
memset(&hints, 0, sizeof(hints));
hints.ai_socktype = SOCK_STREAM;
/* try as an IPv4 literal */
hints.ai_family = AF_INET;
hints.ai_flags = AI_NUMERICHOST;
if (getaddrinfo(h, p, &hints, &res0) != 0) {
/* try again as an IPv6 literal */
hints.ai_family = AF_INET6;
if (getaddrinfo(h, p, &hints, &res0) != 0) {
/* last try, with name resolution and save the error */
hints.ai_family = AF_UNSPEC;
hints.ai_flags = AI_ADDRCONFIG;
if ((s = getaddrinfo(h, p, &hints, &res0)) != 0) {
tls_set_error(ctx, "%s", gai_strerror(s));
goto err;
}
}
}
/* It was resolved somehow; now try connecting to what we got */
s = -1;
for (res = res0; res; res = res->ai_next) {
s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (s == -1) {
tls_set_error(ctx, "socket");
continue;
}
if (connect(s, res->ai_addr, res->ai_addrlen) == -1) {
tls_set_error(ctx, "connect");
close(s);
s = -1;
continue;
}
break; /* Connected. */
}
freeaddrinfo(res0);
if (s == -1)
goto err;
if (servername == NULL)
servername = h;
if (tls_connect_socket(ctx, s, servername) != 0) {
close(s);
goto err;
}
ctx->socket = s;
rv = 0;
err:
free(hs);
free(ps);
return (rv);
}
int
tls_connect_socket(struct tls *ctx, int s, const char *servername)
{
return tls_connect_fds(ctx, s, s, servername);
}
int
tls_connect_fds(struct tls *ctx, int fd_read, int fd_write,
const char *servername)
{
union tls_addr addrbuf;
int rv = -1;
if ((ctx->flags & TLS_CLIENT) == 0) {
tls_set_errorx(ctx, "not a client context");
goto err;
}
if (fd_read < 0 || fd_write < 0) {
tls_set_errorx(ctx, "invalid file descriptors");
goto err;
}
if (servername != NULL) {
if ((ctx->servername = strdup(servername)) == NULL) {
tls_set_errorx(ctx, "out of memory");
goto err;
}
}
if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_client_method())) == NULL) {
tls_set_errorx(ctx, "ssl context failure");
goto err;
}
if (tls_configure_ssl(ctx) != 0)
goto err;
if (tls_configure_keypair(ctx, 0) != 0)
goto err;
if (ctx->config->verify_name) {
if (servername == NULL) {
tls_set_errorx(ctx, "server name not specified");
goto err;
}
}
if (ctx->config->verify_cert &&
(tls_configure_ssl_verify(ctx, SSL_VERIFY_PEER) == -1))
goto err;
if ((ctx->ssl_conn = SSL_new(ctx->ssl_ctx)) == NULL) {
tls_set_errorx(ctx, "ssl connection failure");
goto err;
}
if (SSL_set_app_data(ctx->ssl_conn, ctx) != 1) {
tls_set_errorx(ctx, "ssl application data failure");
goto err;
}
if (SSL_set_rfd(ctx->ssl_conn, fd_read) != 1 ||
SSL_set_wfd(ctx->ssl_conn, fd_write) != 1) {
tls_set_errorx(ctx, "ssl file descriptor failure");
goto err;
}
/*
* RFC4366 (SNI): Literal IPv4 and IPv6 addresses are not
* permitted in "HostName".
*/
if (servername != NULL &&
inet_pton(AF_INET, servername, &addrbuf) != 1 &&
inet_pton(AF_INET6, servername, &addrbuf) != 1) {
if (SSL_set_tlsext_host_name(ctx->ssl_conn, servername) == 0) {
tls_set_errorx(ctx, "server name indication failure");
goto err;
}
}
rv = 0;
err:
return (rv);
}
int
tls_handshake_client(struct tls *ctx)
{
X509 *cert = NULL;
int ssl_ret;
int rv = -1;
if ((ctx->flags & TLS_CLIENT) == 0) {
tls_set_errorx(ctx, "not a client context");
goto err;
}
ERR_clear_error();
if ((ssl_ret = SSL_connect(ctx->ssl_conn)) != 1) {
rv = tls_ssl_error(ctx, ctx->ssl_conn, ssl_ret, "handshake");
goto err;
}
if (ctx->config->verify_name) {
cert = SSL_get_peer_certificate(ctx->ssl_conn);
if (cert == NULL) {
tls_set_errorx(ctx, "no server certificate");
goto err;
}
if ((rv = tls_check_name(ctx, cert,
ctx->servername)) != 0) {
if (rv != -2)
tls_set_errorx(ctx, "name `%s' not present in"
" server certificate", ctx->servername);
goto err;
}
}
ctx->state |= TLS_HANDSHAKE_COMPLETE;
rv = 0;
err:
X509_free(cert);
return (rv);
}
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