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|
/* $OpenBSD: tls_client.c,v 1.1 2014/10/31 13:46:17 jsing 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 <netdb.h>
#include <stdlib.h>
#include <unistd.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)
{
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_error(ctx, "not a client context");
goto err;
}
if (host == NULL) {
tls_set_error(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_error(ctx, "memory allocation failure");
goto err;
}
if (ret != 0)
port = HTTPS_PORT;
}
h = (hs != NULL) ? hs : host;
p = (ps != NULL) ? ps : port;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
if ((ret = getaddrinfo(h, p, &hints, &res0)) != 0) {
tls_set_error(ctx, "%s", gai_strerror(ret));
goto err;
}
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 (tls_connect_socket(ctx, s, h) != 0) {
close(s);
goto err;
}
rv = 0;
err:
free(hs);
free(ps);
return (rv);
}
int
tls_connect_socket(struct tls *ctx, int socket, const char *hostname)
{
union { struct in_addr ip4; struct in6_addr ip6; } addrbuf;
X509 *cert = NULL;
int ret;
if ((ctx->flags & TLS_CLIENT) == 0) {
tls_set_error(ctx, "not a client context");
goto err;
}
ctx->socket = socket;
if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_client_method())) == NULL) {
tls_set_error(ctx, "ssl context failure");
goto err;
}
if (tls_configure_ssl(ctx) != 0)
goto err;
if (ctx->config->verify_host) {
if (hostname == NULL) {
tls_set_error(ctx, "server name not specified");
goto err;
}
}
if (ctx->config->verify_cert) {
SSL_CTX_set_verify(ctx->ssl_ctx, SSL_VERIFY_PEER, NULL);
if (SSL_CTX_load_verify_locations(ctx->ssl_ctx,
ctx->config->ca_file, ctx->config->ca_path) != 1) {
tls_set_error(ctx, "ssl verify setup failure");
goto err;
}
if (ctx->config->verify_depth >= 0)
SSL_CTX_set_verify_depth(ctx->ssl_ctx,
ctx->config->verify_depth);
}
if ((ctx->ssl_conn = SSL_new(ctx->ssl_ctx)) == NULL) {
tls_set_error(ctx, "ssl connection failure");
goto err;
}
if (SSL_set_fd(ctx->ssl_conn, ctx->socket) != 1) {
tls_set_error(ctx, "ssl file descriptor failure");
goto err;
}
/*
* RFC4366 (SNI): Literal IPv4 and IPv6 addresses are not
* permitted in "HostName".
*/
if (hostname != NULL &&
inet_pton(AF_INET, hostname, &addrbuf) != 1 &&
inet_pton(AF_INET6, hostname, &addrbuf) != 1) {
if (SSL_set_tlsext_host_name(ctx->ssl_conn, hostname) == 0) {
tls_set_error(ctx, "SNI host name failed");
goto err;
}
}
if ((ret = SSL_connect(ctx->ssl_conn)) != 1) {
tls_set_error(ctx, "SSL connect failed: %i",
SSL_get_error(ctx->ssl_conn, ret));
goto err;
}
if (ctx->config->verify_host) {
cert = SSL_get_peer_certificate(ctx->ssl_conn);
if (cert == NULL) {
tls_set_error(ctx, "no server certificate");
goto err;
}
if (tls_check_hostname(cert, hostname) != 0) {
tls_set_error(ctx, "host `%s' not present in"
" server certificate", hostname);
goto err;
}
}
return (0);
err:
X509_free(cert);
return (-1);
}
|
