pineapple/externals/libressl/tls/tls_client.c

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2022-04-24 22:29:35 +02:00
/* $OpenBSD: tls_client.c,v 1.48 2021/10/21 08:38:11 tb Exp $ */
2020-12-28 16:15:37 +01:00
/*
* 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 <sys/stat.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <limits.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 (tls_init() == -1)
return (NULL);
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;
}
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/* If port is NULL, try to extract a port from the specified host. */
if (port == NULL) {
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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);
}
static int
tls_client_read_session(struct tls *ctx)
{
int sfd = ctx->config->session_fd;
uint8_t *session = NULL;
size_t session_len = 0;
SSL_SESSION *ss = NULL;
BIO *bio = NULL;
struct stat sb;
ssize_t n;
int rv = -1;
if (fstat(sfd, &sb) == -1) {
tls_set_error(ctx, "failed to stat session file");
goto err;
}
if (sb.st_size < 0 || sb.st_size > INT_MAX) {
tls_set_errorx(ctx, "invalid session file size");
goto err;
}
session_len = (size_t)sb.st_size;
/* A zero size file means that we do not yet have a valid session. */
if (session_len == 0)
goto done;
if ((session = malloc(session_len)) == NULL)
goto err;
n = pread(sfd, session, session_len, 0);
if (n < 0 || (size_t)n != session_len) {
tls_set_error(ctx, "failed to read session file");
goto err;
}
if ((bio = BIO_new_mem_buf(session, session_len)) == NULL)
goto err;
if ((ss = PEM_read_bio_SSL_SESSION(bio, NULL, tls_password_cb,
NULL)) == NULL) {
tls_set_errorx(ctx, "failed to parse session");
goto err;
}
if (SSL_set_session(ctx->ssl_conn, ss) != 1) {
tls_set_errorx(ctx, "failed to set session");
goto err;
}
done:
rv = 0;
err:
freezero(session, session_len);
SSL_SESSION_free(ss);
BIO_free(bio);
return rv;
}
static int
tls_client_write_session(struct tls *ctx)
{
int sfd = ctx->config->session_fd;
SSL_SESSION *ss = NULL;
BIO *bio = NULL;
long data_len;
char *data;
off_t offset;
size_t len;
ssize_t n;
int rv = -1;
if ((ss = SSL_get1_session(ctx->ssl_conn)) == NULL) {
if (ftruncate(sfd, 0) == -1) {
tls_set_error(ctx, "failed to truncate session file");
goto err;
}
goto done;
}
if ((bio = BIO_new(BIO_s_mem())) == NULL)
goto err;
if (PEM_write_bio_SSL_SESSION(bio, ss) == 0)
goto err;
if ((data_len = BIO_get_mem_data(bio, &data)) <= 0)
goto err;
len = (size_t)data_len;
offset = 0;
if (ftruncate(sfd, len) == -1) {
tls_set_error(ctx, "failed to truncate session file");
goto err;
}
while (len > 0) {
if ((n = pwrite(sfd, data + offset, len, offset)) == -1) {
tls_set_error(ctx, "failed to write session file");
goto err;
}
offset += n;
len -= n;
}
done:
rv = 0;
err:
SSL_SESSION_free(ss);
BIO_free_all(bio);
return (rv);
}
static int
tls_connect_common(struct tls *ctx, const char *servername)
{
union tls_addr addrbuf;
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size_t servername_len;
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int rv = -1;
if ((ctx->flags & TLS_CLIENT) == 0) {
tls_set_errorx(ctx, "not a client context");
goto err;
}
if (servername != NULL) {
if ((ctx->servername = strdup(servername)) == NULL) {
tls_set_errorx(ctx, "out of memory");
goto err;
}
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/*
* If there's a trailing dot, remove it. While an FQDN includes
* the terminating dot representing the zero-length label of
* the root (RFC 8499, section 2), the SNI explicitly does not
* include it (RFC 6066, section 3).
*/
servername_len = strlen(ctx->servername);
if (servername_len > 0 &&
ctx->servername[servername_len - 1] == '.')
ctx->servername[servername_len - 1] = '\0';
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}
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, ctx->ssl_ctx) != 0)
goto err;
if (tls_configure_ssl_keypair(ctx, ctx->ssl_ctx,
ctx->config->keypair, 0) != 0)
goto err;
if (ctx->config->verify_name) {
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if (ctx->servername == NULL) {
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tls_set_errorx(ctx, "server name not specified");
goto err;
}
}
if (tls_configure_ssl_verify(ctx, ctx->ssl_ctx, SSL_VERIFY_PEER) == -1)
goto err;
if (ctx->config->ecdhecurves != NULL) {
if (SSL_CTX_set1_groups(ctx->ssl_ctx, ctx->config->ecdhecurves,
ctx->config->ecdhecurves_len) != 1) {
tls_set_errorx(ctx, "failed to set ecdhe curves");
goto err;
}
}
if (SSL_CTX_set_tlsext_status_cb(ctx->ssl_ctx, tls_ocsp_verify_cb) != 1) {
tls_set_errorx(ctx, "ssl OCSP verification setup failure");
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 (ctx->config->session_fd != -1) {
SSL_clear_options(ctx->ssl_conn, SSL_OP_NO_TICKET);
if (tls_client_read_session(ctx) == -1)
goto err;
}
if (SSL_set_tlsext_status_type(ctx->ssl_conn, TLSEXT_STATUSTYPE_ocsp) != 1) {
tls_set_errorx(ctx, "ssl OCSP extension setup failure");
goto err;
}
/*
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* RFC 6066 (SNI): Literal IPv4 and IPv6 addresses are not
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* permitted in "HostName".
*/
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if (ctx->servername != NULL &&
inet_pton(AF_INET, ctx->servername, &addrbuf) != 1 &&
inet_pton(AF_INET6, ctx->servername, &addrbuf) != 1) {
if (SSL_set_tlsext_host_name(ctx->ssl_conn,
ctx->servername) == 0) {
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tls_set_errorx(ctx, "server name indication failure");
goto err;
}
}
ctx->state |= TLS_CONNECTED;
rv = 0;
err:
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)
{
int rv = -1;
if (fd_read < 0 || fd_write < 0) {
tls_set_errorx(ctx, "invalid file descriptors");
goto err;
}
if (tls_connect_common(ctx, servername) != 0)
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;
}
rv = 0;
err:
return (rv);
}
int
tls_connect_cbs(struct tls *ctx, tls_read_cb read_cb,
tls_write_cb write_cb, void *cb_arg, const char *servername)
{
int rv = -1;
if (tls_connect_common(ctx, servername) != 0)
goto err;
if (tls_set_cbs(ctx, read_cb, write_cb, cb_arg) != 0)
goto err;
rv = 0;
err:
return (rv);
}
int
tls_handshake_client(struct tls *ctx)
{
X509 *cert = NULL;
int match, ssl_ret;
int rv = -1;
if ((ctx->flags & TLS_CLIENT) == 0) {
tls_set_errorx(ctx, "not a client context");
goto err;
}
if ((ctx->state & TLS_CONNECTED) == 0) {
tls_set_errorx(ctx, "context not connected");
goto err;
}
ctx->state |= TLS_SSL_NEEDS_SHUTDOWN;
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 (tls_check_name(ctx, cert, ctx->servername, &match) == -1)
goto err;
if (!match) {
tls_set_errorx(ctx, "name `%s' not present in"
" server certificate", ctx->servername);
goto err;
}
}
ctx->state |= TLS_HANDSHAKE_COMPLETE;
if (ctx->config->session_fd != -1) {
if (tls_client_write_session(ctx) == -1)
goto err;
}
rv = 0;
err:
X509_free(cert);
return (rv);
}