static int on_headers_complete(http_parser *parser)
{
parser_context *ctx = (parser_context *) parser->data;
http_subtransport *t = ctx->t;
http_stream *s = ctx->s;
git_buf buf = GIT_BUF_INIT;
/* Both parse_header_name and parse_header_value are populated
* and ready for consumption. */
if (VALUE == t->last_cb)
if (on_header_ready(t) < 0)
return t->parse_error = PARSE_ERROR_GENERIC;
/* Check for an authentication failure. */
if (parser->status_code == 401 &&
get_verb == s->verb &&
t->owner->cred_acquire_cb) {
int allowed_types = 0;
if (parse_unauthorized_response(&t->www_authenticate,
&allowed_types, &t->auth_mechanism) < 0)
return t->parse_error = PARSE_ERROR_GENERIC;
if (allowed_types &&
(!t->cred || 0 == (t->cred->credtype & allowed_types))) {
if (t->owner->cred_acquire_cb(&t->cred,
t->owner->url,
t->connection_data.user,
allowed_types,
t->owner->cred_acquire_payload) < 0)
return PARSE_ERROR_GENERIC;
assert(t->cred);
/* Successfully acquired a credential. */
return t->parse_error = PARSE_ERROR_REPLAY;
}
}
/* Check for a redirect.
* Right now we only permit a redirect to the same hostname. */
if ((parser->status_code == 301 ||
parser->status_code == 302 ||
(parser->status_code == 303 && get_verb == s->verb) ||
parser->status_code == 307) &&
t->location) {
if (s->redirect_count >= 7) {
giterr_set(GITERR_NET, "Too many redirects");
return t->parse_error = PARSE_ERROR_GENERIC;
}
if (gitno_connection_data_from_url(&t->connection_data, t->location, s->service_url) < 0)
return t->parse_error = PARSE_ERROR_GENERIC;
/* Set the redirect URL on the stream. This is a transfer of
* ownership of the memory. */
if (s->redirect_url)
git__free(s->redirect_url);
s->redirect_url = t->location;
t->location = NULL;
t->connected = 0;
s->redirect_count++;
return t->parse_error = PARSE_ERROR_REPLAY;
}
/* Check for a 200 HTTP status code. */
if (parser->status_code != 200) {
giterr_set(GITERR_NET,
"Unexpected HTTP status code: %d",
parser->status_code);
return t->parse_error = PARSE_ERROR_GENERIC;
}
/* The response must contain a Content-Type header. */
if (!t->content_type) {
giterr_set(GITERR_NET, "No Content-Type header in response");
return t->parse_error = PARSE_ERROR_GENERIC;
}
/* The Content-Type header must match our expectation. */
if (get_verb == s->verb)
git_buf_printf(&buf,
"application/x-git-%s-advertisement",
ctx->s->service);
else
git_buf_printf(&buf,
"application/x-git-%s-result",
ctx->s->service);
if (git_buf_oom(&buf))
return t->parse_error = PARSE_ERROR_GENERIC;
if (strcmp(t->content_type, git_buf_cstr(&buf))) {
git_buf_free(&buf);
giterr_set(GITERR_NET,
"Invalid Content-Type: %s",
t->content_type);
return t->parse_error = PARSE_ERROR_GENERIC;
}
git_buf_free(&buf);
return 0;
}
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 on_headers_complete(http_parser *parser)
{
parser_context *ctx = (parser_context *) parser->data;
http_subtransport *t = ctx->t;
http_stream *s = ctx->s;
git_buf buf = GIT_BUF_INIT;
/* Both parse_header_name and parse_header_value are populated
* and ready for consumption. */
if (VALUE == t->last_cb)
if (on_header_ready(t) < 0)
return t->parse_error = PARSE_ERROR_GENERIC;
/* Check for an authentication failure. */
if (parser->status_code == 401 &&
get_verb == s->verb &&
t->owner->cred_acquire_cb) {
int allowed_types = 0;
if (parse_unauthorized_response(&t->www_authenticate,
&allowed_types, &t->auth_mechanism) < 0)
return t->parse_error = PARSE_ERROR_GENERIC;
if (allowed_types &&
(!t->cred || 0 == (t->cred->credtype & allowed_types))) {
if (t->owner->cred_acquire_cb(&t->cred,
t->owner->url,
allowed_types,
t->owner->cred_acquire_payload) < 0)
return PARSE_ERROR_GENERIC;
assert(t->cred);
/* Successfully acquired a credential. */
return t->parse_error = PARSE_ERROR_REPLAY;
}
}
/* Check for a 200 HTTP status code. */
if (parser->status_code != 200) {
giterr_set(GITERR_NET,
"Unexpected HTTP status code: %d",
parser->status_code);
return t->parse_error = PARSE_ERROR_GENERIC;
}
/* The response must contain a Content-Type header. */
if (!t->content_type) {
giterr_set(GITERR_NET, "No Content-Type header in response");
return t->parse_error = PARSE_ERROR_GENERIC;
}
/* The Content-Type header must match our expectation. */
if (get_verb == s->verb)
git_buf_printf(&buf,
"application/x-git-%s-advertisement",
ctx->s->service);
else
git_buf_printf(&buf,
"application/x-git-%s-result",
ctx->s->service);
if (git_buf_oom(&buf))
return t->parse_error = PARSE_ERROR_GENERIC;
if (strcmp(t->content_type, git_buf_cstr(&buf))) {
git_buf_free(&buf);
giterr_set(GITERR_NET,
"Invalid Content-Type: %s",
t->content_type);
return t->parse_error = PARSE_ERROR_GENERIC;
}
git_buf_free(&buf);
return 0;
}
