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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#ifdef GIT_GNUTLS
#include <gnutls/gnutls.h>
#include "stream.h"
#include "socket_stream.h"
#include "git2/transport.h"
void set_gnutls_error(int error)
{
giterr_set(GITERR_SSL, "gnutls: %s", gnutls_strerror(error));
}
typedef struct {
git_stream parent;
git_socket_stream *socket;
gnutls_session_t session;
git_cert_x509 cert_info;
} gnutls_stream;
static int verify_server_cert(gnutls_session_t session, const char *host)
{
int error;
unsigned int status = 0;
if ((error = gnutls_certificate_verify_peers3(session, host, &status)) < 0) {
set_gnutls_error(error);
return -1;
}
if (!status)
return 0;
else
return GIT_ECERTIFICATE;
}
static ssize_t gnutls_stream_write(git_stream *stream, void *data, size_t len, int flags)
{
ssize_t ret;
size_t off;
gnutls_stream *st = (gnutls_stream *) stream;
GIT_UNUSED(flags);
while (off < len) {
ret = gnutls_record_send(st->session, data + off, len - off);
if (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN)
continue; /* try again with the same params */
if (ret < 0) {
set_gnutls_error(ret);
return -1;
}
off += ret;
}
return ret;
}
static ssize_t gnutls_stream_read(git_stream *stream, void *data, size_t len)
{
ssize_t ret;
gnutls_stream *st = (gnutls_stream *) stream;
do {
ret = gnutls_record_recv(st->session, data, len);
} while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
if (ret < 0) {
set_gnutls_error(ret);
return -1;
}
return ret;
}
static int gnutls_connect(git_stream *stream)
{
int error;
gnutls_stream *st = (gnutls_stream *) stream;
if ((error = git_stream_connect((git_stream *)st->socket)) < 0)
return error;
/* ideally we'd have functions that talk to the socket, but for now */
gnutls_transport_set_int(st->session, st->socket->s);
do {
error = gnutls_handshake(st->session);
} while (!gnutls_error_is_fatal(error));
if (error < 0) {
set_gnutls_error(error);
return -1;
}
return verify_server_cert(st->session, st->socket->host);
}
static int gnutls_stream_close(git_stream *stream)
{
gnutls_stream *st = (gnutls_stream *) stream;
int error;
do {
error = gnutls_bye(st->session, GNUTLS_SHUT_RDWR);
} while (error == GNUTLS_E_INTERRUPTED || error == GNUTLS_E_AGAIN);
return git_stream_close((git_stream *)st->socket);
}
static void gnutls_stream_free(git_stream *stream)
{
gnutls_stream *st = (gnutls_stream *) stream;
gnutls_deinit(st->session);
git__free(st);
}
int git_gnutls_stream_new(git_stream **out, const char *host, const char *port)
{
gnutls_stream *st;
int error;
st = git__calloc(1, sizeof(gnutls_stream));
GITERR_CHECK_ALLOC(st);
if (git_socket_stream_new((git_stream **) &st->socket, host, port))
return -1;
if ((error = gnutls_init(&st->session, GNUTLS_CLIENT)) < 0) {
git_stream_free((git_stream *) st->socket);
git__free(st);
return -1;
}
st->parent.encrypted = 1;
st->parent.connect = gnutls_connect;
st->parent.certificate = gnutls_certificate;
st->parent.read = gnutls_stream_read;
st->parent.write = gnutls_stream_write;
st->parent.close = gnutls_stream_close;
st->parent.free = gnutls_stream_free;
*out = (git_stream *) st;
return 0;
}
#else
int git_gnutls_stream_new(git_stream **out, const char *host, const char *port)
{
giterr_set(GITERR_SSL, "GnuTLS is not supported in this version");
return -1;
}
#endif
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