Hash :
e0aed4bd
Author :
Date :
2016-04-21T11:01:09
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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_SECURE_TRANSPORT
#include <CoreFoundation/CoreFoundation.h>
#include <Security/SecureTransport.h>
#include <Security/SecCertificate.h>
#include "git2/transport.h"
#include "socket_stream.h"
#include "curl_stream.h"
int stransport_error(OSStatus ret)
{
CFStringRef message;
if (ret == noErr || ret == errSSLClosedGraceful) {
giterr_clear();
return 0;
}
#if !TARGET_OS_IPHONE
message = SecCopyErrorMessageString(ret, NULL);
GITERR_CHECK_ALLOC(message);
giterr_set(GITERR_NET, "SecureTransport error: %s", CFStringGetCStringPtr(message, kCFStringEncodingUTF8));
CFRelease(message);
#else
giterr_set(GITERR_NET, "SecureTransport error: OSStatus %d", (unsigned int)ret);
#endif
return -1;
}
typedef struct {
git_stream parent;
git_stream *io;
SSLContextRef ctx;
CFDataRef der_data;
git_cert_x509 cert_info;
} stransport_stream;
int stransport_connect(git_stream *stream)
{
stransport_stream *st = (stransport_stream *) stream;
int error;
SecTrustRef trust = NULL;
SecTrustResultType sec_res;
OSStatus ret;
if ((error = git_stream_connect(st->io)) < 0)
return error;
ret = SSLHandshake(st->ctx);
if (ret != errSSLServerAuthCompleted) {
giterr_set(GITERR_SSL, "unexpected return value from ssl handshake %d", ret);
return -1;
}
if ((ret = SSLCopyPeerTrust(st->ctx, &trust)) != noErr)
goto on_error;
if ((ret = SecTrustEvaluate(trust, &sec_res)) != noErr)
goto on_error;
CFRelease(trust);
if (sec_res == kSecTrustResultInvalid || sec_res == kSecTrustResultOtherError) {
giterr_set(GITERR_SSL, "internal security trust error");
return -1;
}
if (sec_res == kSecTrustResultDeny || sec_res == kSecTrustResultRecoverableTrustFailure ||
sec_res == kSecTrustResultFatalTrustFailure)
return GIT_ECERTIFICATE;
return 0;
on_error:
if (trust)
CFRelease(trust);
return stransport_error(ret);
}
int stransport_certificate(git_cert **out, git_stream *stream)
{
stransport_stream *st = (stransport_stream *) stream;
SecTrustRef trust = NULL;
SecCertificateRef sec_cert;
OSStatus ret;
if ((ret = SSLCopyPeerTrust(st->ctx, &trust)) != noErr)
return stransport_error(ret);
sec_cert = SecTrustGetCertificateAtIndex(trust, 0);
st->der_data = SecCertificateCopyData(sec_cert);
CFRelease(trust);
if (st->der_data == NULL) {
giterr_set(GITERR_SSL, "retrieved invalid certificate data");
return -1;
}
st->cert_info.parent.cert_type = GIT_CERT_X509;
st->cert_info.data = (void *) CFDataGetBytePtr(st->der_data);
st->cert_info.len = CFDataGetLength(st->der_data);
*out = (git_cert *)&st->cert_info;
return 0;
}
int stransport_set_proxy(
git_stream *stream,
const git_proxy_options *proxy_opts)
{
stransport_stream *st = (stransport_stream *) stream;
return git_stream_set_proxy(st->io, proxy_opts);
}
/*
* Contrary to typical network IO callbacks, Secure Transport write callback is
* expected to write *all* passed data, not just as much as it can, and any
* other case would be considered a failure.
*
* This behavior is actually not specified in the Apple documentation, but is
* required for things to work correctly (and incidentally, that's also how
* Apple implements it in its projects at opensource.apple.com).
*
* Libgit2 streams happen to already have this very behavior so this is just
* passthrough.
*/
static OSStatus write_cb(SSLConnectionRef conn, const void *data, size_t *len)
{
git_stream *io = (git_stream *) conn;
if (git_stream_write(io, data, *len, 0) < 0) {
return -36; /* "ioErr" from MacErrors.h which is not available on iOS */
}
return noErr;
}
ssize_t stransport_write(git_stream *stream, const char *data, size_t len, int flags)
{
stransport_stream *st = (stransport_stream *) stream;
size_t data_len, processed;
OSStatus ret;
GIT_UNUSED(flags);
data_len = len;
if ((ret = SSLWrite(st->ctx, data, data_len, &processed)) != noErr)
return stransport_error(ret);
return processed;
}
/*
* Contrary to typical network IO callbacks, Secure Transport read callback is
* expected to read *exactly* the requested number of bytes, not just as much
* as it can, and any other case would be considered a failure.
*
* This behavior is actually not specified in the Apple documentation, but is
* required for things to work correctly (and incidentally, that's also how
* Apple implements it in its projects at opensource.apple.com).
*/
static OSStatus read_cb(SSLConnectionRef conn, void *data, size_t *len)
{
git_stream *io = (git_stream *) conn;
OSStatus error = noErr;
size_t off = 0;
ssize_t ret;
do {
ret = git_stream_read(io, data + off, *len - off);
if (ret < 0) {
error = -36; /* "ioErr" from MacErrors.h which is not available on iOS */
break;
}
if (ret == 0) {
error = errSSLClosedGraceful;
break;
}
off += ret;
} while (off < *len);
*len = off;
return error;
}
ssize_t stransport_read(git_stream *stream, void *data, size_t len)
{
stransport_stream *st = (stransport_stream *) stream;
size_t processed;
OSStatus ret;
if ((ret = SSLRead(st->ctx, data, len, &processed)) != noErr)
return stransport_error(ret);
return processed;
}
int stransport_close(git_stream *stream)
{
stransport_stream *st = (stransport_stream *) stream;
OSStatus ret;
ret = SSLClose(st->ctx);
if (ret != noErr && ret != errSSLClosedGraceful)
return stransport_error(ret);
return git_stream_close(st->io);
}
void stransport_free(git_stream *stream)
{
stransport_stream *st = (stransport_stream *) stream;
git_stream_free(st->io);
CFRelease(st->ctx);
if (st->der_data)
CFRelease(st->der_data);
git__free(st);
}
int git_stransport_stream_new(git_stream **out, const char *host, const char *port)
{
stransport_stream *st;
int error;
OSStatus ret;
assert(out && host);
st = git__calloc(1, sizeof(stransport_stream));
GITERR_CHECK_ALLOC(st);
#ifdef GIT_CURL
error = git_curl_stream_new(&st->io, host, port);
#else
error = git_socket_stream_new(&st->io, host, port);
#endif
if (error < 0){
git__free(st);
return error;
}
st->ctx = SSLCreateContext(NULL, kSSLClientSide, kSSLStreamType);
if (!st->ctx) {
giterr_set(GITERR_NET, "failed to create SSL context");
return -1;
}
if ((ret = SSLSetIOFuncs(st->ctx, read_cb, write_cb)) != noErr ||
(ret = SSLSetConnection(st->ctx, st->io)) != noErr ||
(ret = SSLSetSessionOption(st->ctx, kSSLSessionOptionBreakOnServerAuth, true)) != noErr ||
(ret = SSLSetProtocolVersionMin(st->ctx, kTLSProtocol1)) != noErr ||
(ret = SSLSetProtocolVersionMax(st->ctx, kTLSProtocol12)) != noErr ||
(ret = SSLSetPeerDomainName(st->ctx, host, strlen(host))) != noErr) {
git_stream_free((git_stream *)st);
return stransport_error(ret);
}
st->parent.version = GIT_STREAM_VERSION;
st->parent.encrypted = 1;
st->parent.proxy_support = git_stream_supports_proxy(st->io);
st->parent.connect = stransport_connect;
st->parent.certificate = stransport_certificate;
st->parent.set_proxy = stransport_set_proxy;
st->parent.read = stransport_read;
st->parent.write = stransport_write;
st->parent.close = stransport_close;
st->parent.free = stransport_free;
*out = (git_stream *) st;
return 0;
}
#endif