winhttp.c 30.8 KB
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/*
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 * Copyright (C) the libgit2 contributors. All rights reserved.
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 *
 * 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_WINHTTP

#include "git2.h"
#include "git2/transport.h"
#include "buffer.h"
#include "posix.h"
#include "netops.h"
#include "smart.h"
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#include "remote.h"
#include "repository.h"
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#include <winhttp.h>
#pragma comment(lib, "winhttp")

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#include <strsafe.h>

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/* For IInternetSecurityManager zone check */
#include <objbase.h>
#include <urlmon.h>

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/* For UuidCreate */
#pragma comment(lib, "rpcrt4")

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#define WIDEN2(s) L ## s
#define WIDEN(s) WIDEN2(s)

#define MAX_CONTENT_TYPE_LEN	100
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#define WINHTTP_OPTION_PEERDIST_EXTENSION_STATE	109
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#define CACHED_POST_BODY_BUF_SIZE	4096
#define UUID_LENGTH_CCH	32

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static const char *prefix_http = "http://";
static const char *prefix_https = "https://";
static const char *upload_pack_service = "upload-pack";
static const char *upload_pack_ls_service_url = "/info/refs?service=git-upload-pack";
static const char *upload_pack_service_url = "/git-upload-pack";
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static const char *receive_pack_service = "receive-pack";
static const char *receive_pack_ls_service_url = "/info/refs?service=git-receive-pack";
static const char *receive_pack_service_url = "/git-receive-pack";
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static const wchar_t *get_verb = L"GET";
static const wchar_t *post_verb = L"POST";
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static const wchar_t *pragma_nocache = L"Pragma: no-cache";
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static const wchar_t *transfer_encoding = L"Transfer-Encoding: chunked";
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static const int no_check_cert_flags = SECURITY_FLAG_IGNORE_CERT_CN_INVALID |
	SECURITY_FLAG_IGNORE_CERT_DATE_INVALID |
	SECURITY_FLAG_IGNORE_UNKNOWN_CA;

#define OWNING_SUBTRANSPORT(s) ((winhttp_subtransport *)(s)->parent.subtransport)

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typedef enum {
	GIT_WINHTTP_AUTH_BASIC = 1,
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	GIT_WINHTTP_AUTH_NEGOTIATE = 2,
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} winhttp_authmechanism_t;

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typedef struct {
	git_smart_subtransport_stream parent;
	const char *service;
	const char *service_url;
	const wchar_t *verb;
	HINTERNET request;
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	wchar_t *request_uri;
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	char *chunk_buffer;
	unsigned chunk_buffer_len;
	HANDLE post_body;
	DWORD post_body_len;
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	unsigned sent_request : 1,
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		received_response : 1,
		chunked : 1;
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} winhttp_stream;

typedef struct {
	git_smart_subtransport parent;
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	transport_smart *owner;
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	gitno_connection_data connection_data;
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	git_cred *cred;
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	git_cred *url_cred;
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	int auth_mechanism;
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	HINTERNET session;
	HINTERNET connection;
} winhttp_subtransport;

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static int apply_basic_credential(HINTERNET request, git_cred *cred)
{
	git_cred_userpass_plaintext *c = (git_cred_userpass_plaintext *)cred;
	git_buf buf = GIT_BUF_INIT, raw = GIT_BUF_INIT;
	wchar_t *wide = NULL;
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	int error = -1, wide_len = 0;
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	git_buf_printf(&raw, "%s:%s", c->username, c->password);

	if (git_buf_oom(&raw) ||
		git_buf_puts(&buf, "Authorization: Basic ") < 0 ||
		git_buf_put_base64(&buf, git_buf_cstr(&raw), raw.size) < 0)
		goto on_error;

	wide_len = MultiByteToWideChar(CP_UTF8,	MB_ERR_INVALID_CHARS,
		git_buf_cstr(&buf),	-1, NULL, 0);

	if (!wide_len) {
		giterr_set(GITERR_OS, "Failed to measure string for wide conversion");
		goto on_error;
	}

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	wide = git__malloc(wide_len * sizeof(wchar_t));
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	if (!wide)
		goto on_error;

	if (!MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
		git_buf_cstr(&buf), -1, wide, wide_len)) {
		giterr_set(GITERR_OS, "Failed to convert string to wide form");
		goto on_error;
	}

	if (!WinHttpAddRequestHeaders(request, wide, (ULONG) -1L, WINHTTP_ADDREQ_FLAG_ADD)) {
		giterr_set(GITERR_OS, "Failed to add a header to the request");
		goto on_error;
	}

	error = 0;

on_error:
	/* We were dealing with plaintext passwords, so clean up after ourselves a bit. */
	if (wide)
		memset(wide, 0x0, wide_len * sizeof(wchar_t));

	if (buf.size)
		memset(buf.ptr, 0x0, buf.size);

	if (raw.size)
		memset(raw.ptr, 0x0, raw.size);

	git__free(wide);
	git_buf_free(&buf);
	git_buf_free(&raw);
	return error;
}

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static int apply_default_credentials(HINTERNET request)
{
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	/* Either the caller explicitly requested that default credentials be passed,
	 * or our fallback credential callback was invoked and checked that the target
	 * URI was in the appropriate Internet Explorer security zone. By setting this
	 * flag, we guarantee that the credentials are delivered by WinHTTP. The default
	 * is "medium" which applies to the intranet and sounds like it would correspond
	 * to Internet Explorer security zones, but in fact does not. */
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	DWORD data = WINHTTP_AUTOLOGON_SECURITY_LEVEL_LOW;

	if (!WinHttpSetOption(request, WINHTTP_OPTION_AUTOLOGON_POLICY, &data, sizeof(DWORD)))
		return -1;

	return 0;
}

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static int fallback_cred_acquire_cb(
	git_cred **cred,
	const char *url,
	const char *username_from_url,
	unsigned int allowed_types,
	void *payload)
{
	int error = 1;

	/* If the target URI supports integrated Windows authentication
	 * as an authentication mechanism */
	if (GIT_CREDTYPE_DEFAULT & allowed_types) {
		LPWSTR wide_url;
		DWORD wide_len;

		/* Convert URL to wide characters */
		wide_len = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, url, -1, NULL, 0);

		if (!wide_len) {
			giterr_set(GITERR_OS, "Failed to measure string for wide conversion");
			return -1;
		}

		wide_url = git__malloc(wide_len * sizeof(WCHAR));
		GITERR_CHECK_ALLOC(wide_url);

		if (!MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, url, -1, wide_url, wide_len)) {
			giterr_set(GITERR_OS, "Failed to convert string to wide form");
			git__free(wide_url);
			return -1;
		}

		if (SUCCEEDED(CoInitializeEx(NULL, COINIT_MULTITHREADED))) {
			IInternetSecurityManager* pISM;

			/* And if the target URI is in the My Computer, Intranet, or Trusted zones */
			if (SUCCEEDED(CoCreateInstance(&CLSID_InternetSecurityManager, NULL,
				CLSCTX_ALL, &IID_IInternetSecurityManager, (void **)&pISM))) {
				DWORD dwZone;

				if (SUCCEEDED(pISM->lpVtbl->MapUrlToZone(pISM, wide_url, &dwZone, 0)) &&
					(URLZONE_LOCAL_MACHINE == dwZone ||
					URLZONE_INTRANET == dwZone ||
					URLZONE_TRUSTED == dwZone)) {
					git_cred *existing = *cred;

					if (existing)
						existing->free(existing);

					/* Then use default Windows credentials to authenticate this request */
					error = git_cred_default_new(cred);
				}

				pISM->lpVtbl->Release(pISM);
			}

			CoUninitialize();
		}

		git__free(wide_url);
	}

	return error;
}

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static int winhttp_stream_connect(winhttp_stream *s)
{
	winhttp_subtransport *t = OWNING_SUBTRANSPORT(s);
	git_buf buf = GIT_BUF_INIT;
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	char *proxy_url = NULL;
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	wchar_t ct[MAX_CONTENT_TYPE_LEN];
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	wchar_t *types[] = { L"*/*", NULL };
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	BOOL peerdist = FALSE;
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	int error = -1, wide_len;
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	unsigned long disable_redirects = WINHTTP_DISABLE_REDIRECTS;
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	/* Prepare URL */
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	git_buf_printf(&buf, "%s%s", t->connection_data.path, s->service_url);
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	if (git_buf_oom(&buf))
		return -1;

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	/* Convert URL to wide characters */
	wide_len = MultiByteToWideChar(CP_UTF8,	MB_ERR_INVALID_CHARS,
		git_buf_cstr(&buf),	-1, NULL, 0);

	if (!wide_len) {
		giterr_set(GITERR_OS, "Failed to measure string for wide conversion");
		goto on_error;
	}

	s->request_uri = git__malloc(wide_len * sizeof(wchar_t));

	if (!s->request_uri)
		goto on_error;

	if (!MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
		git_buf_cstr(&buf), -1, s->request_uri, wide_len)) {
		giterr_set(GITERR_OS, "Failed to convert string to wide form");
		goto on_error;
	}
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	/* Establish request */
	s->request = WinHttpOpenRequest(
			t->connection,
			s->verb,
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			s->request_uri,
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			NULL,
			WINHTTP_NO_REFERER,
			types,
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			t->connection_data.use_ssl ? WINHTTP_FLAG_SECURE : 0);
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	if (!s->request) {
		giterr_set(GITERR_OS, "Failed to open request");
		goto on_error;
	}

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	/* Set proxy if necessary */
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	if (git_remote__get_http_proxy(t->owner->owner, !!t->connection_data.use_ssl, &proxy_url) < 0)
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		goto on_error;

	if (proxy_url) {
		WINHTTP_PROXY_INFO proxy_info;
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		wchar_t *proxy_wide;

		/* Convert URL to wide characters */
		wide_len = MultiByteToWideChar(CP_UTF8,	MB_ERR_INVALID_CHARS,
			proxy_url, -1, NULL, 0);
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		if (!wide_len) {
			giterr_set(GITERR_OS, "Failed to measure string for wide conversion");
			goto on_error;
		}
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		proxy_wide = git__malloc(wide_len * sizeof(wchar_t));

		if (!proxy_wide)
			goto on_error;

		if (!MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
			proxy_url, -1, proxy_wide, wide_len)) {
			giterr_set(GITERR_OS, "Failed to convert string to wide form");
			git__free(proxy_wide);
			goto on_error;
		}
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		/* Strip any trailing forward slash on the proxy URL;
		 * WinHTTP doesn't like it if one is present */
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		if (wide_len > 1 && L'/' == proxy_wide[wide_len - 2])
			proxy_wide[wide_len - 2] = L'\0';
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		proxy_info.dwAccessType = WINHTTP_ACCESS_TYPE_NAMED_PROXY;
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		proxy_info.lpszProxy = proxy_wide;
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		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");
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			git__free(proxy_wide);
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			goto on_error;
		}
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		git__free(proxy_wide);
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	}

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	/* 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
	 */
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	if (!WinHttpSetOption(s->request,
		WINHTTP_OPTION_DISABLE_FEATURE,
		&disable_redirects,
		sizeof(disable_redirects))) {
			giterr_set(GITERR_OS, "Failed to disable redirects");
			goto on_error;
	}

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	/* 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;
	}

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	if (post_verb == s->verb) {
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		/* Send Content-Type and Accept headers -- only necessary on a POST */
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		git_buf_clear(&buf);
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		if (git_buf_printf(&buf,
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			"Content-Type: application/x-git-%s-request",
			s->service) < 0)
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			goto on_error;

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		git__utf8_to_16(ct, MAX_CONTENT_TYPE_LEN, git_buf_cstr(&buf));
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		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;

		git__utf8_to_16(ct, MAX_CONTENT_TYPE_LEN, git_buf_cstr(&buf));

		if (!WinHttpAddRequestHeaders(s->request, ct, (ULONG)-1L,
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			WINHTTP_ADDREQ_FLAG_ADD | WINHTTP_ADDREQ_FLAG_REPLACE)) {
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			giterr_set(GITERR_OS, "Failed to add a header to the request");
			goto on_error;
		}
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	}

	/* If requested, disable certificate validation */
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	if (t->connection_data.use_ssl) {
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		int flags;

		if (t->owner->parent.read_flags(&t->owner->parent, &flags) < 0)
			goto on_error;

		if ((GIT_TRANSPORTFLAGS_NO_CHECK_CERT & flags) &&
			!WinHttpSetOption(s->request, WINHTTP_OPTION_SECURITY_FLAGS,
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			(LPVOID)&no_check_cert_flags, sizeof(no_check_cert_flags))) {
			giterr_set(GITERR_OS, "Failed to set options to ignore cert errors");
			goto on_error;
		}
	}

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	/* 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;
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	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;
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	/* If no other credentials have been applied and the URL has username and
	 * password, use those */
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	if (!t->cred && t->connection_data.user && t->connection_data.pass) {
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		if (!t->url_cred &&
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			git_cred_userpass_plaintext_new(&t->url_cred, t->connection_data.user, t->connection_data.pass) < 0)
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			goto on_error;
		if (apply_basic_credential(s->request, t->url_cred) < 0)
			goto on_error;
	}

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	/* We've done everything up to calling WinHttpSendRequest. */

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	error = 0;
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on_error:
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	git__free(proxy_url);
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	git_buf_free(&buf);
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	return error;
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}

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static int parse_unauthorized_response(
	HINTERNET request,
	int *allowed_types,
	int *auth_mechanism)
{
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	DWORD supported, first, target;
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	*allowed_types = 0;
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	*auth_mechanism = 0;
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	/* WinHttpQueryHeaders() must be called before WinHttpQueryAuthSchemes(). 
	 * We can assume this was already done, since we know we are unauthorized. 
	 */
	if (!WinHttpQueryAuthSchemes(request, &supported, &first, &target)) {
		giterr_set(GITERR_OS, "Failed to parse supported auth schemes"); 
		return -1;
	}
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	if (WINHTTP_AUTH_SCHEME_BASIC & supported) {
		*allowed_types |= GIT_CREDTYPE_USERPASS_PLAINTEXT;
		*auth_mechanism = GIT_WINHTTP_AUTH_BASIC;
	}
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	if ((WINHTTP_AUTH_SCHEME_NTLM & supported) ||
		(WINHTTP_AUTH_SCHEME_NEGOTIATE & supported)) {
		*allowed_types |= GIT_CREDTYPE_DEFAULT;
		*auth_mechanism = GIT_WINHTTP_AUTH_NEGOTIATE;
	}

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	return 0;
}

static int write_chunk(HINTERNET request, const char *buffer, size_t len)
{
	DWORD bytes_written;
	git_buf buf = GIT_BUF_INIT;

	/* Chunk header */
	git_buf_printf(&buf, "%X\r\n", len);

	if (git_buf_oom(&buf))
		return -1;

	if (!WinHttpWriteData(request,
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		git_buf_cstr(&buf),	(DWORD)git_buf_len(&buf),
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		&bytes_written)) {
		git_buf_free(&buf);
		giterr_set(GITERR_OS, "Failed to write chunk header");
		return -1;
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	}

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	git_buf_free(&buf);

	/* Chunk body */
	if (!WinHttpWriteData(request,
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		buffer, (DWORD)len,
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		&bytes_written)) {
		giterr_set(GITERR_OS, "Failed to write chunk");
		return -1;
	}

	/* Chunk footer */
	if (!WinHttpWriteData(request,
		"\r\n", 2,
		&bytes_written)) {
		giterr_set(GITERR_OS, "Failed to write chunk footer");
		return -1;
	}

	return 0;
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}

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static int winhttp_connect(
	winhttp_subtransport *t,
	const char *url)
{
	wchar_t *ua = L"git/1.0 (libgit2 " WIDEN(LIBGIT2_VERSION) L")";
	git_win32_path host;
	int32_t port;
	const char *default_port = "80";

	/* Prepare port */
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	if (git__strtol32(&port, t->connection_data.port, NULL, 10) < 0)
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		return -1;

	/* Prepare host */
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	git_win32_path_from_c(host, t->connection_data.host);
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	/* Establish session */
	t->session = WinHttpOpen(
		ua,
		WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
		WINHTTP_NO_PROXY_NAME,
		WINHTTP_NO_PROXY_BYPASS,
		0);

	if (!t->session) {
		giterr_set(GITERR_OS, "Failed to init WinHTTP");
		return -1;
	}

	/* Establish connection */
	t->connection = WinHttpConnect(
		t->session,
		host,
		(INTERNET_PORT) port,
		0);

	if (!t->connection) {
		giterr_set(GITERR_OS, "Failed to connect to host");
		return -1;
	}

	return 0;
}

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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);
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	DWORD dw_bytes_read;
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	char replay_count = 0;
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replay:
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	/* 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;
	}

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	/* Connect if necessary */
	if (!s->request && winhttp_stream_connect(s) < 0)
		return -1;

	if (!s->received_response) {
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		DWORD status_code, status_code_length, content_type_length, bytes_written;
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		char expected_content_type_8[MAX_CONTENT_TYPE_LEN];
		wchar_t expected_content_type[MAX_CONTENT_TYPE_LEN], content_type[MAX_CONTENT_TYPE_LEN];

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		if (!s->sent_request) {
			if (!WinHttpSendRequest(s->request,
				WINHTTP_NO_ADDITIONAL_HEADERS, 0,
				WINHTTP_NO_REQUEST_DATA, 0,
				s->post_body_len, 0)) {
				giterr_set(GITERR_OS, "Failed to send request");
				return -1;
			}

			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;
			}

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			buffer = git__malloc(CACHED_POST_BODY_BUF_SIZE);
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			while (len > 0) {
				DWORD bytes_written;

				if (!ReadFile(s->post_body, buffer,
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					min(CACHED_POST_BODY_BUF_SIZE, len),
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					&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;
		}

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		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)) {
661
				giterr_set(GITERR_OS, "Failed to retrieve status code");
662 663 664
				return -1;
		}

665 666 667 668 669 670 671 672 673 674 675 676 677 678
		/* 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. */
679 680 681 682 683 684 685 686 687 688 689 690 691 692 693
			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;
			}
694

695 696 697 698 699 700 701 702 703 704 705
			location = git__malloc(location_length);
			location8 = 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");
706
				git__free(location);
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				return -1;
			}
			git__utf16_to_8(location8, location_length, location);
			git__free(location);

			/* Replay the request */
			WinHttpCloseHandle(s->request);
			s->request = NULL;
			s->sent_request = 0;

			if (!git__prefixcmp_icase(location8, prefix_https)) {
				/* Upgrade to secure connection; disconnect and start over */
Ben Straub committed
719
				if (gitno_connection_data_from_url(&t->connection_data, location8, s->service_url) < 0)
720
					return -1;
721
				winhttp_connect(t, location8);
722
			}
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			git__free(location8);
			goto replay;
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		}

728
		/* Handle authentication failures */
729
		if (HTTP_STATUS_DENIED == status_code && get_verb == s->verb) {
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			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))) {
737
				int cred_error = 1;
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				/* 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);
743

744 745 746
					if (cred_error < 0)
						return cred_error;
				}
747

748 749 750 751
				/* 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);
752

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					if (cred_error < 0)
						return cred_error;
				}

				if (!cred_error) {
					assert(t->cred);

					WinHttpCloseHandle(s->request);
					s->request = NULL;
					s->sent_request = 0;

					/* Successfully acquired a credential */
					goto replay;
				}
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			}
		}

770 771 772 773 774 775 776 777 778 779 780
		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)
			snprintf(expected_content_type_8, MAX_CONTENT_TYPE_LEN, "application/x-git-%s-result", s->service);
		else
			snprintf(expected_content_type_8, MAX_CONTENT_TYPE_LEN, "application/x-git-%s-advertisement", s->service);

781
		git__utf8_to_16(expected_content_type, MAX_CONTENT_TYPE_LEN, expected_content_type_8);
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		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,
803
		(DWORD)buf_size,
804
		&dw_bytes_read))
805 806 807 808 809
	{
		giterr_set(GITERR_OS, "Failed to read data");
		return -1;
	}

810 811
	*bytes_read = dw_bytes_read;

812 813 814
	return 0;
}

815
static int winhttp_stream_write_single(
816 817 818 819 820 821 822 823 824 825 826
	git_smart_subtransport_stream *stream,
	const char *buffer,
	size_t len)
{
	winhttp_stream *s = (winhttp_stream *)stream;
	winhttp_subtransport *t = OWNING_SUBTRANSPORT(s);
	DWORD bytes_written;

	if (!s->request && winhttp_stream_connect(s) < 0)
		return -1;

827 828 829 830 831 832 833
	/* This implementation of write permits only a single call. */
	if (s->sent_request) {
		giterr_set(GITERR_NET, "Subtransport configured for only one write");
		return -1;
	}

	if (!WinHttpSendRequest(s->request,
834 835 836 837 838 839 840 841 842 843 844 845 846
			WINHTTP_NO_ADDITIONAL_HEADERS, 0,
			WINHTTP_NO_REQUEST_DATA, 0,
			(DWORD)len, 0)) {
		giterr_set(GITERR_OS, "Failed to send request");
		return -1;
	}

	s->sent_request = 1;

	if (!WinHttpWriteData(s->request,
			(LPCVOID)buffer,
			(DWORD)len,
			&bytes_written)) {
847 848 849 850 851 852 853 854 855
		giterr_set(GITERR_OS, "Failed to write data");
		return -1;
	}

	assert((DWORD)len == bytes_written);

	return 0;
}

856
static int put_uuid_string(LPWSTR buffer, size_t buffer_len_cch)
857 858 859
{
	UUID uuid;
	RPC_STATUS status = UuidCreate(&uuid);
860
	HRESULT result;
861 862 863 864 865 866 867 868

	if (RPC_S_OK != status &&
		RPC_S_UUID_LOCAL_ONLY != status &&
		RPC_S_UUID_NO_ADDRESS != status) {
		giterr_set(GITERR_NET, "Unable to generate name for temp file");
		return -1;
	}

869 870
	if (buffer_len_cch < UUID_LENGTH_CCH + 1) {
		giterr_set(GITERR_NET, "Buffer too small for name of temp file");
871 872 873
		return -1;
	}

874 875 876
	result = StringCbPrintfW(
		buffer, buffer_len_cch,
		L"%08x%04x%04x%02x%02x%02x%02x%02x%02x%02x%02x",
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		uuid.Data1, uuid.Data2, uuid.Data3,
		uuid.Data4[0], uuid.Data4[1], uuid.Data4[2], uuid.Data4[3],
		uuid.Data4[4], uuid.Data4[5], uuid.Data4[6], uuid.Data4[7]);

881
	if (FAILED(result)) {
882 883 884 885 886 887 888 889 890
		giterr_set(GITERR_OS, "Unable to generate name for temp file");
		return -1;
	}

	return 0;
}

static int get_temp_file(LPWSTR buffer, DWORD buffer_len_cch)
{
891
	size_t len;
892 893 894 895 896 897 898 899

	if (!GetTempPathW(buffer_len_cch, buffer)) {
		giterr_set(GITERR_OS, "Failed to get temp path");
		return -1;
	}

	len = wcslen(buffer);

900
	if (buffer[len - 1] != '\\' && len < buffer_len_cch)
901 902
		buffer[len++] = '\\';

903
	if (put_uuid_string(&buffer[len], (size_t)buffer_len_cch - len) < 0)
904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942
		return -1;

	return 0;
}

static int winhttp_stream_write_buffered(
	git_smart_subtransport_stream *stream,
	const char *buffer,
	size_t len)
{
	winhttp_stream *s = (winhttp_stream *)stream;
	winhttp_subtransport *t = OWNING_SUBTRANSPORT(s);
	DWORD bytes_written;

	if (!s->request && winhttp_stream_connect(s) < 0)
		return -1;

	/* Buffer the payload, using a temporary file so we delegate
	 * memory management of the data to the operating system. */
	if (!s->post_body) {
		wchar_t temp_path[MAX_PATH + 1];

		if (get_temp_file(temp_path, MAX_PATH + 1) < 0)
			return -1;

		s->post_body = CreateFileW(temp_path,
			GENERIC_READ | GENERIC_WRITE,
			FILE_SHARE_DELETE, NULL,
			CREATE_NEW,
			FILE_ATTRIBUTE_TEMPORARY | FILE_FLAG_DELETE_ON_CLOSE | FILE_FLAG_SEQUENTIAL_SCAN,
			NULL);

		if (INVALID_HANDLE_VALUE == s->post_body) {
			s->post_body = NULL;
			giterr_set(GITERR_OS, "Failed to create temporary file");
			return -1;
		}
	}

943
	if (!WriteFile(s->post_body, buffer, (DWORD)len, &bytes_written, NULL)) {
944
		giterr_set(GITERR_OS, "Failed to write to temporary file");
945 946 947 948 949
		return -1;
	}

	assert((DWORD)len == bytes_written);

950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000
	s->post_body_len += bytes_written;

	return 0;
}

static int winhttp_stream_write_chunked(
	git_smart_subtransport_stream *stream,
	const char *buffer,
	size_t len)
{
	winhttp_stream *s = (winhttp_stream *)stream;
	winhttp_subtransport *t = OWNING_SUBTRANSPORT(s);

	if (!s->request && winhttp_stream_connect(s) < 0)
		return -1;

	if (!s->sent_request) {
		/* Send Transfer-Encoding: chunked header */
		if (!WinHttpAddRequestHeaders(s->request,
			transfer_encoding, (ULONG) -1L,
			WINHTTP_ADDREQ_FLAG_ADD)) {
			giterr_set(GITERR_OS, "Failed to add a header to the request");
			return -1;
		}

		if (!WinHttpSendRequest(s->request,
			WINHTTP_NO_ADDITIONAL_HEADERS, 0,
			WINHTTP_NO_REQUEST_DATA, 0,
			WINHTTP_IGNORE_REQUEST_TOTAL_LENGTH, 0)) {
			giterr_set(GITERR_OS, "Failed to send request");
			return -1;
		}

		s->sent_request = 1;
	}

	if (len > CACHED_POST_BODY_BUF_SIZE) {
		/* Flush, if necessary */
		if (s->chunk_buffer_len > 0) {
			if (write_chunk(s->request, s->chunk_buffer, s->chunk_buffer_len) < 0)
				return -1;

			s->chunk_buffer_len = 0;
		}

		/* Write chunk directly */
		if (write_chunk(s->request, buffer, len) < 0)
			return -1;
	}
	else {
		/* Append as much to the buffer as we can */
1001
		int count = min(CACHED_POST_BODY_BUF_SIZE - s->chunk_buffer_len, (int)len);
1002 1003

		if (!s->chunk_buffer)
1004
			s->chunk_buffer = git__malloc(CACHED_POST_BODY_BUF_SIZE);
1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020

		memcpy(s->chunk_buffer + s->chunk_buffer_len, buffer, count);
		s->chunk_buffer_len += count;
		buffer += count;
		len -= count;

		/* Is the buffer full? If so, then flush */
		if (CACHED_POST_BODY_BUF_SIZE == s->chunk_buffer_len) {
			if (write_chunk(s->request, s->chunk_buffer, s->chunk_buffer_len) < 0)
				return -1;

			s->chunk_buffer_len = 0;

			/* Is there any remaining data from the source? */
			if (len > 0) {
				memcpy(s->chunk_buffer, buffer, len);
1021
				s->chunk_buffer_len = (unsigned int)len;
1022 1023 1024 1025
			}
		}
	}

1026 1027 1028 1029 1030 1031 1032
	return 0;
}

static void winhttp_stream_free(git_smart_subtransport_stream *stream)
{
	winhttp_stream *s = (winhttp_stream *)stream;

1033 1034 1035 1036 1037 1038 1039 1040 1041 1042
	if (s->chunk_buffer) {
		git__free(s->chunk_buffer);
		s->chunk_buffer = NULL;
	}

	if (s->post_body) {
		CloseHandle(s->post_body);
		s->post_body = NULL;
	}

1043 1044 1045 1046 1047
	if (s->request_uri) {
		git__free(s->request_uri);
		s->request_uri = NULL;
	}

1048 1049 1050 1051 1052 1053 1054 1055
	if (s->request) {
		WinHttpCloseHandle(s->request);
		s->request = NULL;
	}

	git__free(s);
}

1056
static int winhttp_stream_alloc(winhttp_subtransport *t, winhttp_stream **stream)
1057 1058 1059 1060 1061 1062
{
	winhttp_stream *s;

	if (!stream)
		return -1;

1063
	s = git__calloc(sizeof(winhttp_stream), 1);
1064 1065 1066 1067
	GITERR_CHECK_ALLOC(s);

	s->parent.subtransport = &t->parent;
	s->parent.read = winhttp_stream_read;
1068
	s->parent.write = winhttp_stream_write_single;
1069 1070
	s->parent.free = winhttp_stream_free;

1071 1072
	*stream = s;

1073 1074 1075 1076 1077
	return 0;
}

static int winhttp_uploadpack_ls(
	winhttp_subtransport *t,
1078
	winhttp_stream *s)
1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
{
	s->service = upload_pack_service;
	s->service_url = upload_pack_ls_service_url;
	s->verb = get_verb;

	return 0;
}

static int winhttp_uploadpack(
	winhttp_subtransport *t,
1089
	winhttp_stream *s)
1090
{
1091 1092 1093
	s->service = upload_pack_service;
	s->service_url = upload_pack_service_url;
	s->verb = post_verb;
1094

1095 1096
	return 0;
}
1097

1098 1099 1100 1101 1102 1103 1104
static int winhttp_receivepack_ls(
	winhttp_subtransport *t,
	winhttp_stream *s)
{
	s->service = receive_pack_service;
	s->service_url = receive_pack_ls_service_url;
	s->verb = get_verb;
1105

1106 1107
	return 0;
}
1108

1109 1110 1111 1112 1113 1114
static int winhttp_receivepack(
	winhttp_subtransport *t,
	winhttp_stream *s)
{
	/* WinHTTP only supports Transfer-Encoding: chunked
	 * on Windows Vista (NT 6.0) and higher. */
1115
	s->chunked = git_has_win32_version(6, 0, 0);
1116 1117 1118 1119 1120 1121 1122 1123

	if (s->chunked)
		s->parent.write = winhttp_stream_write_chunked;
	else
		s->parent.write = winhttp_stream_write_buffered;

	s->service = receive_pack_service;
	s->service_url = receive_pack_service_url;
1124 1125 1126 1127 1128 1129 1130
	s->verb = post_verb;

	return 0;
}

static int winhttp_action(
	git_smart_subtransport_stream **stream,
1131
	git_smart_subtransport *subtransport,
1132 1133 1134
	const char *url,
	git_smart_service_t action)
{
1135 1136 1137 1138
	winhttp_subtransport *t = (winhttp_subtransport *)subtransport;
	winhttp_stream *s;
	int ret = -1;

1139 1140 1141
	if (!t->connection)
		if (gitno_connection_data_from_url(&t->connection_data, url, NULL) < 0 ||
			 winhttp_connect(t, url) < 0)
1142
			return -1;
1143 1144 1145

	if (winhttp_stream_alloc(t, &s) < 0)
		return -1;
1146 1147 1148 1149 1150 1151 1152

	if (!stream)
		return -1;

	switch (action)
	{
		case GIT_SERVICE_UPLOADPACK_LS:
1153 1154
			ret = winhttp_uploadpack_ls(t, s);
			break;
1155 1156

		case GIT_SERVICE_UPLOADPACK:
1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169
			ret = winhttp_uploadpack(t, s);
			break;

		case GIT_SERVICE_RECEIVEPACK_LS:
			ret = winhttp_receivepack_ls(t, s);
			break;

		case GIT_SERVICE_RECEIVEPACK:
			ret = winhttp_receivepack(t, s);
			break;

		default:
			assert(0);
1170 1171
	}

1172 1173 1174 1175
	if (!ret)
		*stream = &s->parent;

	return ret;
1176 1177
}

1178
static int winhttp_close(git_smart_subtransport *subtransport)
1179
{
1180 1181 1182
	winhttp_subtransport *t = (winhttp_subtransport *)subtransport;
	int ret = 0;

1183
	gitno_connection_data_free_ptrs(&t->connection_data);
1184

1185 1186 1187 1188 1189
	if (t->cred) {
		t->cred->free(t->cred);
		t->cred = NULL;
	}

1190 1191 1192 1193 1194
	if (t->url_cred) {
		t->url_cred->free(t->url_cred);
		t->url_cred = NULL;
	}

1195
	if (t->connection) {
1196 1197 1198 1199 1200
		if (!WinHttpCloseHandle(t->connection)) {
			giterr_set(GITERR_OS, "Unable to close connection");
			ret = -1;
		}

1201 1202 1203 1204
		t->connection = NULL;
	}

	if (t->session) {
1205 1206 1207 1208 1209
		if (!WinHttpCloseHandle(t->session)) {
			giterr_set(GITERR_OS, "Unable to close session");
			ret = -1;
		}

1210 1211 1212
		t->session = NULL;
	}

1213 1214 1215 1216 1217 1218 1219 1220 1221
	return ret;
}

static void winhttp_free(git_smart_subtransport *subtransport)
{
	winhttp_subtransport *t = (winhttp_subtransport *)subtransport;

	winhttp_close(subtransport);

1222 1223 1224 1225 1226 1227 1228 1229 1230 1231
	git__free(t);
}

int git_smart_subtransport_http(git_smart_subtransport **out, git_transport *owner)
{
	winhttp_subtransport *t;

	if (!out)
		return -1;

1232
	t = git__calloc(sizeof(winhttp_subtransport), 1);
1233 1234
	GITERR_CHECK_ALLOC(t);

1235
	t->owner = (transport_smart *)owner;
1236
	t->parent.action = winhttp_action;
1237
	t->parent.close = winhttp_close;
1238 1239 1240 1241 1242 1243 1244
	t->parent.free = winhttp_free;

	*out = (git_smart_subtransport *) t;
	return 0;
}

#endif /* GIT_WINHTTP */