static void winhttp_stream_free(git_smart_subtransport_stream *stream)
{
winhttp_stream *s = (winhttp_stream *)stream;
winhttp_stream_close(s);
git__free(s);
}
static int winhttp_stream_read(
git_smart_subtransport_stream *stream,
char *buffer,
size_t buf_size,
size_t *bytes_read)
{
winhttp_stream *s = (winhttp_stream *)stream;
winhttp_subtransport *t = OWNING_SUBTRANSPORT(s);
DWORD dw_bytes_read;
char replay_count = 0;
int error;
replay:
/* Enforce a reasonable cap on the number of replays */
if (++replay_count >= 7) {
giterr_set(GITERR_NET, "Too many redirects or authentication replays");
return -1;
}
/* Connect if necessary */
if (!s->request && winhttp_stream_connect(s) < 0)
return -1;
if (!s->received_response) {
DWORD status_code, status_code_length, content_type_length, bytes_written;
char expected_content_type_8[MAX_CONTENT_TYPE_LEN];
wchar_t expected_content_type[MAX_CONTENT_TYPE_LEN], content_type[MAX_CONTENT_TYPE_LEN];
if (!s->sent_request) {
if ((error = send_request(s, s->post_body_len, 0)) < 0)
return error;
s->sent_request = 1;
}
if (s->chunked) {
assert(s->verb == post_verb);
/* Flush, if necessary */
if (s->chunk_buffer_len > 0 &&
write_chunk(s->request, s->chunk_buffer, s->chunk_buffer_len) < 0)
return -1;
s->chunk_buffer_len = 0;
/* Write the final chunk. */
if (!WinHttpWriteData(s->request,
"0\r\n\r\n", 5,
&bytes_written)) {
giterr_set(GITERR_OS, "Failed to write final chunk");
return -1;
}
}
else if (s->post_body) {
char *buffer;
DWORD len = s->post_body_len, bytes_read;
if (INVALID_SET_FILE_POINTER == SetFilePointer(s->post_body,
0, 0, FILE_BEGIN) &&
NO_ERROR != GetLastError()) {
giterr_set(GITERR_OS, "Failed to reset file pointer");
return -1;
}
buffer = git__malloc(CACHED_POST_BODY_BUF_SIZE);
while (len > 0) {
DWORD bytes_written;
if (!ReadFile(s->post_body, buffer,
min(CACHED_POST_BODY_BUF_SIZE, len),
&bytes_read, NULL) ||
!bytes_read) {
git__free(buffer);
giterr_set(GITERR_OS, "Failed to read from temp file");
return -1;
}
if (!WinHttpWriteData(s->request, buffer,
bytes_read, &bytes_written)) {
git__free(buffer);
giterr_set(GITERR_OS, "Failed to write data");
return -1;
}
len -= bytes_read;
assert(bytes_read == bytes_written);
}
git__free(buffer);
/* Eagerly close the temp file */
CloseHandle(s->post_body);
s->post_body = NULL;
}
if (!WinHttpReceiveResponse(s->request, 0)) {
giterr_set(GITERR_OS, "Failed to receive response");
return -1;
}
/* Verify that we got a 200 back */
status_code_length = sizeof(status_code);
if (!WinHttpQueryHeaders(s->request,
WINHTTP_QUERY_STATUS_CODE | WINHTTP_QUERY_FLAG_NUMBER,
WINHTTP_HEADER_NAME_BY_INDEX,
&status_code, &status_code_length,
WINHTTP_NO_HEADER_INDEX)) {
giterr_set(GITERR_OS, "Failed to retrieve status code");
return -1;
}
/* The implementation of WinHTTP prior to Windows 7 will not
* redirect to an identical URI. Some Git hosters use self-redirects
* as part of their DoS mitigation strategy. Check first to see if we
* have a redirect status code, and that we haven't already streamed
* a post body. (We can't replay a streamed POST.) */
if (!s->chunked &&
(HTTP_STATUS_MOVED == status_code ||
HTTP_STATUS_REDIRECT == status_code ||
(HTTP_STATUS_REDIRECT_METHOD == status_code &&
get_verb == s->verb) ||
HTTP_STATUS_REDIRECT_KEEP_VERB == status_code)) {
/* Check for Windows 7. This workaround is only necessary on
* Windows Vista and earlier. Windows 7 is version 6.1. */
wchar_t *location;
DWORD location_length;
char *location8;
/* OK, fetch the Location header from the redirect. */
if (WinHttpQueryHeaders(s->request,
WINHTTP_QUERY_LOCATION,
WINHTTP_HEADER_NAME_BY_INDEX,
WINHTTP_NO_OUTPUT_BUFFER,
&location_length,
WINHTTP_NO_HEADER_INDEX) ||
GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
giterr_set(GITERR_OS, "Failed to read Location header");
return -1;
}
location = git__malloc(location_length);
GITERR_CHECK_ALLOC(location);
if (!WinHttpQueryHeaders(s->request,
WINHTTP_QUERY_LOCATION,
WINHTTP_HEADER_NAME_BY_INDEX,
location,
&location_length,
WINHTTP_NO_HEADER_INDEX)) {
giterr_set(GITERR_OS, "Failed to read Location header");
git__free(location);
return -1;
}
/* Convert the Location header to UTF-8 */
if (git__utf16_to_8_alloc(&location8, location) < 0) {
giterr_set(GITERR_OS, "Failed to convert Location header to UTF-8");
git__free(location);
return -1;
}
git__free(location);
/* Replay the request */
winhttp_stream_close(s);
if (!git__prefixcmp_icase(location8, prefix_https)) {
/* Upgrade to secure connection; disconnect and start over */
if (gitno_connection_data_from_url(&t->connection_data, location8, s->service_url) < 0) {
git__free(location8);
return -1;
}
winhttp_close_connection(t);
if (winhttp_connect(t) < 0)
return -1;
}
git__free(location8);
goto replay;
}
/* Handle authentication failures */
if (HTTP_STATUS_DENIED == status_code && get_verb == s->verb) {
int allowed_types;
if (parse_unauthorized_response(s->request, &allowed_types, &t->auth_mechanism) < 0)
return -1;
if (allowed_types &&
(!t->cred || 0 == (t->cred->credtype & allowed_types))) {
int cred_error = 1;
/* Start with the user-supplied credential callback, if present */
if (t->owner->cred_acquire_cb) {
cred_error = t->owner->cred_acquire_cb(&t->cred, t->owner->url,
t->connection_data.user, allowed_types, t->owner->cred_acquire_payload);
if (cred_error < 0)
return cred_error;
}
/* Invoke the fallback credentials acquisition callback if necessary */
if (cred_error > 0) {
cred_error = fallback_cred_acquire_cb(&t->cred, t->owner->url,
t->connection_data.user, allowed_types, NULL);
if (cred_error < 0)
return cred_error;
}
if (!cred_error) {
assert(t->cred);
winhttp_stream_close(s);
/* Successfully acquired a credential */
goto replay;
}
}
}
if (HTTP_STATUS_OK != status_code) {
giterr_set(GITERR_NET, "Request failed with status code: %d", status_code);
return -1;
}
/* Verify that we got the correct content-type back */
if (post_verb == s->verb)
p_snprintf(expected_content_type_8, MAX_CONTENT_TYPE_LEN, "application/x-git-%s-result", s->service);
else
p_snprintf(expected_content_type_8, MAX_CONTENT_TYPE_LEN, "application/x-git-%s-advertisement", s->service);
if (git__utf8_to_16(expected_content_type, MAX_CONTENT_TYPE_LEN, expected_content_type_8) < 0) {
giterr_set(GITERR_OS, "Failed to convert expected content-type to wide characters");
return -1;
}
content_type_length = sizeof(content_type);
if (!WinHttpQueryHeaders(s->request,
WINHTTP_QUERY_CONTENT_TYPE,
WINHTTP_HEADER_NAME_BY_INDEX,
&content_type, &content_type_length,
WINHTTP_NO_HEADER_INDEX)) {
giterr_set(GITERR_OS, "Failed to retrieve response content-type");
return -1;
}
if (wcscmp(expected_content_type, content_type)) {
giterr_set(GITERR_NET, "Received unexpected content-type");
return -1;
}
s->received_response = 1;
}
if (!WinHttpReadData(s->request,
(LPVOID)buffer,
(DWORD)buf_size,
&dw_bytes_read))
{
giterr_set(GITERR_OS, "Failed to read data");
return -1;
}
*bytes_read = dw_bytes_read;
return 0;
}
static int winhttp_stream_connect(winhttp_stream *s)
{
winhttp_subtransport *t = OWNING_SUBTRANSPORT(s);
git_buf buf = GIT_BUF_INIT;
char *proxy_url = NULL;
wchar_t ct[MAX_CONTENT_TYPE_LEN];
LPCWSTR types[] = { L"*/*", NULL };
BOOL peerdist = FALSE;
int error = -1;
unsigned long disable_redirects = WINHTTP_DISABLE_REDIRECTS;
int default_timeout = TIMEOUT_INFINITE;
int default_connect_timeout = DEFAULT_CONNECT_TIMEOUT;
/* Prepare URL */
git_buf_printf(&buf, "%s%s", t->connection_data.path, s->service_url);
if (git_buf_oom(&buf))
return -1;
/* Convert URL to wide characters */
if (git__utf8_to_16_alloc(&s->request_uri, git_buf_cstr(&buf)) < 0) {
giterr_set(GITERR_OS, "Failed to convert string to wide form");
goto on_error;
}
/* Establish request */
s->request = WinHttpOpenRequest(
t->connection,
s->verb,
s->request_uri,
NULL,
WINHTTP_NO_REFERER,
types,
t->connection_data.use_ssl ? WINHTTP_FLAG_SECURE : 0);
if (!s->request) {
giterr_set(GITERR_OS, "Failed to open request");
goto on_error;
}
if (!WinHttpSetTimeouts(s->request, default_timeout, default_connect_timeout, default_timeout, default_timeout)) {
giterr_set(GITERR_OS, "Failed to set timeouts for WinHTTP");
goto on_error;
}
/* Set proxy if necessary */
if (git_remote__get_http_proxy(t->owner->owner, !!t->connection_data.use_ssl, &proxy_url) < 0)
goto on_error;
if (proxy_url) {
WINHTTP_PROXY_INFO proxy_info;
wchar_t *proxy_wide;
/* Convert URL to wide characters */
int proxy_wide_len = git__utf8_to_16_alloc(&proxy_wide, proxy_url);
if (proxy_wide_len < 0) {
giterr_set(GITERR_OS, "Failed to convert string to wide form");
goto on_error;
}
/* Strip any trailing forward slash on the proxy URL;
* WinHTTP doesn't like it if one is present */
if (proxy_wide_len > 1 && L'/' == proxy_wide[proxy_wide_len - 2])
proxy_wide[proxy_wide_len - 2] = L'\0';
proxy_info.dwAccessType = WINHTTP_ACCESS_TYPE_NAMED_PROXY;
proxy_info.lpszProxy = proxy_wide;
proxy_info.lpszProxyBypass = NULL;
if (!WinHttpSetOption(s->request,
WINHTTP_OPTION_PROXY,
&proxy_info,
sizeof(WINHTTP_PROXY_INFO))) {
giterr_set(GITERR_OS, "Failed to set proxy");
git__free(proxy_wide);
goto on_error;
}
git__free(proxy_wide);
}
/* Disable WinHTTP redirects so we can handle them manually. Why, you ask?
* http://social.msdn.microsoft.com/Forums/windowsdesktop/en-US/b2ff8879-ab9f-4218-8f09-16d25dff87ae
*/
if (!WinHttpSetOption(s->request,
WINHTTP_OPTION_DISABLE_FEATURE,
&disable_redirects,
sizeof(disable_redirects))) {
giterr_set(GITERR_OS, "Failed to disable redirects");
goto on_error;
}
/* Strip unwanted headers (X-P2P-PeerDist, X-P2P-PeerDistEx) that WinHTTP
* adds itself. This option may not be supported by the underlying
* platform, so we do not error-check it */
WinHttpSetOption(s->request,
WINHTTP_OPTION_PEERDIST_EXTENSION_STATE,
&peerdist,
sizeof(peerdist));
/* Send Pragma: no-cache header */
if (!WinHttpAddRequestHeaders(s->request, pragma_nocache, (ULONG) -1L, WINHTTP_ADDREQ_FLAG_ADD)) {
giterr_set(GITERR_OS, "Failed to add a header to the request");
goto on_error;
}
if (post_verb == s->verb) {
/* Send Content-Type and Accept headers -- only necessary on a POST */
git_buf_clear(&buf);
if (git_buf_printf(&buf,
"Content-Type: application/x-git-%s-request",
s->service) < 0)
goto on_error;
if (git__utf8_to_16(ct, MAX_CONTENT_TYPE_LEN, git_buf_cstr(&buf)) < 0) {
giterr_set(GITERR_OS, "Failed to convert content-type to wide characters");
goto on_error;
}
if (!WinHttpAddRequestHeaders(s->request, ct, (ULONG)-1L,
WINHTTP_ADDREQ_FLAG_ADD | WINHTTP_ADDREQ_FLAG_REPLACE)) {
giterr_set(GITERR_OS, "Failed to add a header to the request");
goto on_error;
}
git_buf_clear(&buf);
if (git_buf_printf(&buf,
"Accept: application/x-git-%s-result",
s->service) < 0)
goto on_error;
if (git__utf8_to_16(ct, MAX_CONTENT_TYPE_LEN, git_buf_cstr(&buf)) < 0) {
giterr_set(GITERR_OS, "Failed to convert accept header to wide characters");
goto on_error;
}
if (!WinHttpAddRequestHeaders(s->request, ct, (ULONG)-1L,
WINHTTP_ADDREQ_FLAG_ADD | WINHTTP_ADDREQ_FLAG_REPLACE)) {
giterr_set(GITERR_OS, "Failed to add a header to the request");
goto on_error;
}
}
/* If requested, disable certificate validation */
if (t->connection_data.use_ssl) {
int flags;
if (t->owner->parent.read_flags(&t->owner->parent, &flags) < 0)
goto on_error;
}
/* If we have a credential on the subtransport, apply it to the request */
if (t->cred &&
t->cred->credtype == GIT_CREDTYPE_USERPASS_PLAINTEXT &&
t->auth_mechanism == GIT_WINHTTP_AUTH_BASIC &&
apply_basic_credential(s->request, t->cred) < 0)
goto on_error;
else if (t->cred &&
t->cred->credtype == GIT_CREDTYPE_DEFAULT &&
t->auth_mechanism == GIT_WINHTTP_AUTH_NEGOTIATE &&
apply_default_credentials(s->request) < 0)
goto on_error;
/* If no other credentials have been applied and the URL has username and
* password, use those */
if (!t->cred && t->connection_data.user && t->connection_data.pass) {
if (!t->url_cred &&
git_cred_userpass_plaintext_new(&t->url_cred, t->connection_data.user, t->connection_data.pass) < 0)
goto on_error;
if (apply_basic_credential(s->request, t->url_cred) < 0)
goto on_error;
}
/* We've done everything up to calling WinHttpSendRequest. */
error = 0;
on_error:
if (error < 0)
winhttp_stream_close(s);
git__free(proxy_url);
git_buf_free(&buf);
return error;
}
static int winhttp_stream_connect(winhttp_stream *s)
{
winhttp_subtransport *t = OWNING_SUBTRANSPORT(s);
git_buf buf = GIT_BUF_INIT;
char *proxy_url = NULL;
wchar_t ct[MAX_CONTENT_TYPE_LEN];
LPCWSTR types[] = { L"*/*", NULL };
BOOL peerdist = FALSE;
int error = -1;
unsigned long disable_redirects = WINHTTP_DISABLE_REDIRECTS;
int default_timeout = TIMEOUT_INFINITE;
int default_connect_timeout = DEFAULT_CONNECT_TIMEOUT;
size_t i;
const git_proxy_options *proxy_opts;
/* Prepare URL */
git_buf_printf(&buf, "%s%s", t->connection_data.path, s->service_url);
if (git_buf_oom(&buf))
return -1;
/* Convert URL to wide characters */
if (git__utf8_to_16_alloc(&s->request_uri, git_buf_cstr(&buf)) < 0) {
giterr_set(GITERR_OS, "failed to convert string to wide form");
goto on_error;
}
/* Establish request */
s->request = WinHttpOpenRequest(
t->connection,
s->verb,
s->request_uri,
NULL,
WINHTTP_NO_REFERER,
types,
t->connection_data.use_ssl ? WINHTTP_FLAG_SECURE : 0);
if (!s->request) {
giterr_set(GITERR_OS, "failed to open request");
goto on_error;
}
if (!WinHttpSetTimeouts(s->request, default_timeout, default_connect_timeout, default_timeout, default_timeout)) {
giterr_set(GITERR_OS, "failed to set timeouts for WinHTTP");
goto on_error;
}
proxy_opts = &t->owner->proxy;
if (proxy_opts->type == GIT_PROXY_AUTO) {
/* Set proxy if necessary */
if (git_remote__get_http_proxy(t->owner->owner, !!t->connection_data.use_ssl, &proxy_url) < 0)
goto on_error;
}
else if (proxy_opts->type == GIT_PROXY_SPECIFIED) {
proxy_url = git__strdup(proxy_opts->url);
GITERR_CHECK_ALLOC(proxy_url);
}
if (proxy_url) {
git_buf processed_url = GIT_BUF_INIT;
WINHTTP_PROXY_INFO proxy_info;
wchar_t *proxy_wide;
if (!git__prefixcmp(proxy_url, SCHEME_HTTP)) {
t->proxy_connection_data.use_ssl = false;
} else if (!git__prefixcmp(proxy_url, SCHEME_HTTPS)) {
t->proxy_connection_data.use_ssl = true;
} else {
giterr_set(GITERR_NET, "invalid URL: '%s'", proxy_url);
return -1;
}
gitno_connection_data_free_ptrs(&t->proxy_connection_data);
if ((error = gitno_extract_url_parts(&t->proxy_connection_data.host, &t->proxy_connection_data.port, NULL,
&t->proxy_connection_data.user, &t->proxy_connection_data.pass, proxy_url, NULL)) < 0)
goto on_error;
if (t->proxy_connection_data.user && t->proxy_connection_data.pass) {
if (t->proxy_cred) {
t->proxy_cred->free(t->proxy_cred);
}
if ((error = git_cred_userpass_plaintext_new(&t->proxy_cred, t->proxy_connection_data.user, t->proxy_connection_data.pass)) < 0)
goto on_error;
}
if (t->proxy_connection_data.use_ssl)
git_buf_PUTS(&processed_url, SCHEME_HTTPS);
else
git_buf_PUTS(&processed_url, SCHEME_HTTP);
git_buf_puts(&processed_url, t->proxy_connection_data.host);
if (t->proxy_connection_data.port)
git_buf_printf(&processed_url, ":%s", t->proxy_connection_data.port);
if (git_buf_oom(&processed_url)) {
giterr_set_oom();
error = -1;
goto on_error;
}
/* Convert URL to wide characters */
error = git__utf8_to_16_alloc(&proxy_wide, processed_url.ptr);
git_buf_free(&processed_url);
if (error < 0)
goto on_error;
proxy_info.dwAccessType = WINHTTP_ACCESS_TYPE_NAMED_PROXY;
proxy_info.lpszProxy = proxy_wide;
proxy_info.lpszProxyBypass = NULL;
if (!WinHttpSetOption(s->request,
WINHTTP_OPTION_PROXY,
&proxy_info,
sizeof(WINHTTP_PROXY_INFO))) {
giterr_set(GITERR_OS, "failed to set proxy");
git__free(proxy_wide);
goto on_error;
}
git__free(proxy_wide);
if (t->proxy_cred) {
if (t->proxy_cred->credtype == GIT_CREDTYPE_USERPASS_PLAINTEXT) {
if ((error = apply_userpass_credential_proxy(s->request, t->proxy_cred)) < 0)
goto on_error;
}
}
}
/* Disable WinHTTP redirects so we can handle them manually. Why, you ask?
* http://social.msdn.microsoft.com/Forums/windowsdesktop/en-US/b2ff8879-ab9f-4218-8f09-16d25dff87ae
*/
if (!WinHttpSetOption(s->request,
WINHTTP_OPTION_DISABLE_FEATURE,
&disable_redirects,
sizeof(disable_redirects))) {
giterr_set(GITERR_OS, "failed to disable redirects");
goto on_error;
}
/* Strip unwanted headers (X-P2P-PeerDist, X-P2P-PeerDistEx) that WinHTTP
* adds itself. This option may not be supported by the underlying
* platform, so we do not error-check it */
WinHttpSetOption(s->request,
WINHTTP_OPTION_PEERDIST_EXTENSION_STATE,
&peerdist,
sizeof(peerdist));
/* Send Pragma: no-cache header */
if (!WinHttpAddRequestHeaders(s->request, pragma_nocache, (ULONG) -1L, WINHTTP_ADDREQ_FLAG_ADD)) {
giterr_set(GITERR_OS, "failed to add a header to the request");
goto on_error;
}
if (post_verb == s->verb) {
/* Send Content-Type and Accept headers -- only necessary on a POST */
git_buf_clear(&buf);
if (git_buf_printf(&buf,
"Content-Type: application/x-git-%s-request",
s->service) < 0)
goto on_error;
if (git__utf8_to_16(ct, MAX_CONTENT_TYPE_LEN, git_buf_cstr(&buf)) < 0) {
giterr_set(GITERR_OS, "failed to convert content-type to wide characters");
goto on_error;
}
if (!WinHttpAddRequestHeaders(s->request, ct, (ULONG)-1L,
WINHTTP_ADDREQ_FLAG_ADD | WINHTTP_ADDREQ_FLAG_REPLACE)) {
giterr_set(GITERR_OS, "failed to add a header to the request");
goto on_error;
}
git_buf_clear(&buf);
if (git_buf_printf(&buf,
"Accept: application/x-git-%s-result",
s->service) < 0)
goto on_error;
if (git__utf8_to_16(ct, MAX_CONTENT_TYPE_LEN, git_buf_cstr(&buf)) < 0) {
giterr_set(GITERR_OS, "failed to convert accept header to wide characters");
goto on_error;
}
if (!WinHttpAddRequestHeaders(s->request, ct, (ULONG)-1L,
WINHTTP_ADDREQ_FLAG_ADD | WINHTTP_ADDREQ_FLAG_REPLACE)) {
giterr_set(GITERR_OS, "failed to add a header to the request");
goto on_error;
}
}
for (i = 0; i < t->owner->custom_headers.count; i++) {
if (t->owner->custom_headers.strings[i]) {
git_buf_clear(&buf);
git_buf_puts(&buf, t->owner->custom_headers.strings[i]);
if (git__utf8_to_16(ct, MAX_CONTENT_TYPE_LEN, git_buf_cstr(&buf)) < 0) {
giterr_set(GITERR_OS, "failed to convert custom header to wide characters");
goto on_error;
}
if (!WinHttpAddRequestHeaders(s->request, ct, (ULONG)-1L,
WINHTTP_ADDREQ_FLAG_ADD | WINHTTP_ADDREQ_FLAG_REPLACE)) {
giterr_set(GITERR_OS, "failed to add a header to the request");
goto on_error;
}
}
}
/* If requested, disable certificate validation */
if (t->connection_data.use_ssl) {
int flags;
if (t->owner->parent.read_flags(&t->owner->parent, &flags) < 0)
goto on_error;
}
/* If we have a credential on the subtransport, apply it to the request */
if (t->cred &&
t->cred->credtype == GIT_CREDTYPE_USERPASS_PLAINTEXT &&
apply_userpass_credential(s->request, t->auth_mechanisms, t->cred) < 0)
goto on_error;
else if (t->cred &&
t->cred->credtype == GIT_CREDTYPE_DEFAULT &&
apply_default_credentials(s->request, t->auth_mechanisms) < 0)
goto on_error;
/* If no other credentials have been applied and the URL has username and
* password, use those */
if (!t->cred && t->connection_data.user && t->connection_data.pass) {
if (!t->url_cred &&
git_cred_userpass_plaintext_new(&t->url_cred, t->connection_data.user, t->connection_data.pass) < 0)
goto on_error;
if (apply_userpass_credential(s->request, GIT_WINHTTP_AUTH_BASIC, t->url_cred) < 0)
goto on_error;
}
/* We've done everything up to calling WinHttpSendRequest. */
error = 0;
on_error:
if (error < 0)
winhttp_stream_close(s);
git__free(proxy_url);
git_buf_free(&buf);
return error;
}
