httpclient.c 38.1 KB
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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.
 */

#include "common.h"
#include "git2.h"
#include "http_parser.h"
#include "vector.h"
#include "trace.h"
#include "httpclient.h"
#include "http.h"
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#include "auth.h"
#include "auth_negotiate.h"
#include "auth_ntlm.h"
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#include "git2/sys/credential.h"
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#include "net.h"
#include "stream.h"
#include "streams/socket.h"
#include "streams/tls.h"
#include "auth.h"

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static git_http_auth_scheme auth_schemes[] = {
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	{ GIT_HTTP_AUTH_NEGOTIATE, "Negotiate", GIT_CREDENTIAL_DEFAULT, git_http_auth_negotiate },
	{ GIT_HTTP_AUTH_NTLM, "NTLM", GIT_CREDENTIAL_USERPASS_PLAINTEXT, git_http_auth_ntlm },
	{ GIT_HTTP_AUTH_BASIC, "Basic", GIT_CREDENTIAL_USERPASS_PLAINTEXT, git_http_auth_basic },
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};

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/*
 * Use a 16kb read buffer to match the maximum size of a TLS packet.  This
 * is critical for compatibility with SecureTransport, which will always do
 * a network read on every call, even if it has data buffered to return to
 * you.  That buffered data may be the _end_ of a keep-alive response, so
 * if SecureTransport performs another network read, it will wait until the
 * server ultimately times out before it returns that buffered data to you.
 * Since SecureTransport only reads a single TLS packet at a time, by
 * calling it with a read buffer that is the maximum size of a TLS packet,
 * we ensure that it will never buffer.
 */
#define GIT_READ_BUFFER_SIZE (16 * 1024)
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typedef struct {
	git_net_url url;
	git_stream *stream;
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	git_vector auth_challenges;
	git_http_auth_context *auth_context;
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} git_http_server;

typedef enum {
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	PROXY = 1,
	SERVER
} git_http_server_t;

typedef enum {
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	NONE = 0,
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	SENDING_REQUEST,
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	SENDING_BODY,
	SENT_REQUEST,
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	HAS_EARLY_RESPONSE,
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	READING_RESPONSE,
	READING_BODY,
	DONE
} http_client_state;

/* Parser state */
typedef enum {
	PARSE_HEADER_NONE = 0,
	PARSE_HEADER_NAME,
	PARSE_HEADER_VALUE,
	PARSE_HEADER_COMPLETE
} parse_header_state;

typedef enum {
	PARSE_STATUS_OK,
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	PARSE_STATUS_NO_OUTPUT,
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	PARSE_STATUS_ERROR
} parse_status;

typedef struct {
	git_http_client *client;
	git_http_response *response;

	/* Temporary buffers to avoid extra mallocs */
	git_buf parse_header_name;
	git_buf parse_header_value;

	/* Parser state */
	int error;
	parse_status parse_status;

	/* Headers parsing */
	parse_header_state parse_header_state;

	/* Body parsing */
	char *output_buf;       /* Caller's output buffer */
	size_t output_size;     /* Size of caller's output buffer */
	size_t output_written;  /* Bytes we've written to output buffer */
} http_parser_context;

/* HTTP client connection */
struct git_http_client {
	git_http_client_options opts;

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	/* Are we writing to the proxy or server, and state of the client. */
	git_http_server_t current_server;
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	http_client_state state;

	http_parser parser;

	git_http_server server;
	git_http_server proxy;

	unsigned request_count;
	unsigned connected : 1,
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	         proxy_connected : 1,
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	         keepalive : 1,
	         request_chunked : 1;
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	/* Temporary buffers to avoid extra mallocs */
	git_buf request_msg;
	git_buf read_buf;

	/* A subset of information from the request */
	size_t request_body_len,
	       request_body_remain;
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	/*
	 * When state == HAS_EARLY_RESPONSE, the response of our proxy
	 * that we have buffered and will deliver during read_response.
	 */
	git_http_response early_response;
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};

bool git_http_response_is_redirect(git_http_response *response)
{
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	return (response->status == GIT_HTTP_MOVED_PERMANENTLY ||
	        response->status == GIT_HTTP_FOUND ||
	        response->status == GIT_HTTP_SEE_OTHER ||
		response->status == GIT_HTTP_TEMPORARY_REDIRECT ||
		response->status == GIT_HTTP_PERMANENT_REDIRECT);
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}

void git_http_response_dispose(git_http_response *response)
{
	assert(response);

	git__free(response->content_type);
	git__free(response->location);

	memset(response, 0, sizeof(git_http_response));
}

static int on_header_complete(http_parser *parser)
{
	http_parser_context *ctx = (http_parser_context *) parser->data;
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	git_http_client *client = ctx->client;
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	git_http_response *response = ctx->response;

	git_buf *name = &ctx->parse_header_name;
	git_buf *value = &ctx->parse_header_value;

	if (!strcasecmp("Content-Type", name->ptr)) {
		if (response->content_type) {
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			git_error_set(GIT_ERROR_HTTP,
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			              "multiple content-type headers");
			return -1;
		}

		response->content_type =
			git__strndup(value->ptr, value->size);
		GIT_ERROR_CHECK_ALLOC(ctx->response->content_type);
	} else if (!strcasecmp("Content-Length", name->ptr)) {
		int64_t len;

		if (response->content_length) {
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			git_error_set(GIT_ERROR_HTTP,
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			              "multiple content-length headers");
			return -1;
		}

		if (git__strntol64(&len, value->ptr, value->size,
		                   NULL, 10) < 0 || len < 0) {
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			git_error_set(GIT_ERROR_HTTP,
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			              "invalid content-length");
			return -1;
		}

		response->content_length = (size_t)len;
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	} else if (!strcasecmp("Transfer-Encoding", name->ptr) &&
	           !strcasecmp("chunked", value->ptr)) {
			ctx->response->chunked = 1;
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	} else if (!strcasecmp("Proxy-Authenticate", git_buf_cstr(name))) {
		char *dup = git__strndup(value->ptr, value->size);
		GIT_ERROR_CHECK_ALLOC(dup);

		if (git_vector_insert(&client->proxy.auth_challenges, dup) < 0)
			return -1;
	} else if (!strcasecmp("WWW-Authenticate", name->ptr)) {
		char *dup = git__strndup(value->ptr, value->size);
		GIT_ERROR_CHECK_ALLOC(dup);

		if (git_vector_insert(&client->server.auth_challenges, dup) < 0)
			return -1;
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	} else if (!strcasecmp("Location", name->ptr)) {
		if (response->location) {
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			git_error_set(GIT_ERROR_HTTP,
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				"multiple location headers");
			return -1;
		}

		response->location = git__strndup(value->ptr, value->size);
		GIT_ERROR_CHECK_ALLOC(response->location);
	}

	return 0;
}

static int on_header_field(http_parser *parser, const char *str, size_t len)
{
	http_parser_context *ctx = (http_parser_context *) parser->data;

	switch (ctx->parse_header_state) {
	/*
	 * We last saw a header value, process the name/value pair and
	 * get ready to handle this new name.
	 */
	case PARSE_HEADER_VALUE:
		if (on_header_complete(parser) < 0)
			return ctx->parse_status = PARSE_STATUS_ERROR;

		git_buf_clear(&ctx->parse_header_name);
		git_buf_clear(&ctx->parse_header_value);
		/* Fall through */

	case PARSE_HEADER_NONE:
	case PARSE_HEADER_NAME:
		ctx->parse_header_state = PARSE_HEADER_NAME;

		if (git_buf_put(&ctx->parse_header_name, str, len) < 0)
			return ctx->parse_status = PARSE_STATUS_ERROR;

		break;

	default:
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		git_error_set(GIT_ERROR_HTTP,
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		              "header name seen at unexpected time");
		return ctx->parse_status = PARSE_STATUS_ERROR;
	}

	return 0;
}

static int on_header_value(http_parser *parser, const char *str, size_t len)
{
	http_parser_context *ctx = (http_parser_context *) parser->data;

	switch (ctx->parse_header_state) {
	case PARSE_HEADER_NAME:
	case PARSE_HEADER_VALUE:
		ctx->parse_header_state = PARSE_HEADER_VALUE;

		if (git_buf_put(&ctx->parse_header_value, str, len) < 0)
			return ctx->parse_status = PARSE_STATUS_ERROR;

		break;

	default:
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		git_error_set(GIT_ERROR_HTTP,
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		              "header value seen at unexpected time");
		return ctx->parse_status = PARSE_STATUS_ERROR;
	}

	return 0;
}

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GIT_INLINE(bool) challenge_matches_scheme(
	const char *challenge,
	git_http_auth_scheme *scheme)
{
	const char *scheme_name = scheme->name;
	size_t scheme_len = strlen(scheme_name);

	if (!strncasecmp(challenge, scheme_name, scheme_len) &&
	    (challenge[scheme_len] == '\0' || challenge[scheme_len] == ' '))
		return true;

	return false;
}

static git_http_auth_scheme *scheme_for_challenge(const char *challenge)
{
	size_t i;

	for (i = 0; i < ARRAY_SIZE(auth_schemes); i++) {
		if (challenge_matches_scheme(challenge, &auth_schemes[i]))
			return &auth_schemes[i];
	}

	return NULL;
}

GIT_INLINE(void) collect_authinfo(
	unsigned int *schemetypes,
	unsigned int *credtypes,
	git_vector *challenges)
{
	git_http_auth_scheme *scheme;
	const char *challenge;
	size_t i;

	*schemetypes = 0;
	*credtypes = 0;

	git_vector_foreach(challenges, i, challenge) {
		if ((scheme = scheme_for_challenge(challenge)) != NULL) {
			*schemetypes |= scheme->type;
			*credtypes |= scheme->credtypes;
		}
	}
}

static int resend_needed(git_http_client *client, git_http_response *response)
{
	git_http_auth_context *auth_context;

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	if (response->status == GIT_HTTP_STATUS_UNAUTHORIZED &&
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	    (auth_context = client->server.auth_context) &&
	    auth_context->is_complete &&
	    !auth_context->is_complete(auth_context))
		return 1;

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	if (response->status == GIT_HTTP_STATUS_PROXY_AUTHENTICATION_REQUIRED &&
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	    (auth_context = client->proxy.auth_context) &&
	    auth_context->is_complete &&
	    !auth_context->is_complete(auth_context))
		return 1;

	return 0;
}

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static int on_headers_complete(http_parser *parser)
{
	http_parser_context *ctx = (http_parser_context *) parser->data;

	/* Finalize the last seen header */
	switch (ctx->parse_header_state) {
	case PARSE_HEADER_VALUE:
		if (on_header_complete(parser) < 0)
			return ctx->parse_status = PARSE_STATUS_ERROR;

		/* Fall through */

	case PARSE_HEADER_NONE:
		ctx->parse_header_state = PARSE_HEADER_COMPLETE;
		break;

	default:
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		git_error_set(GIT_ERROR_HTTP,
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		              "header completion at unexpected time");
		return ctx->parse_status = PARSE_STATUS_ERROR;
	}

	ctx->response->status = parser->status_code;
	ctx->client->keepalive = http_should_keep_alive(parser);

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	/* Prepare for authentication */
	collect_authinfo(&ctx->response->server_auth_schemetypes,
	                 &ctx->response->server_auth_credtypes,
	                 &ctx->client->server.auth_challenges);
	collect_authinfo(&ctx->response->proxy_auth_schemetypes,
	                 &ctx->response->proxy_auth_credtypes,
	                 &ctx->client->proxy.auth_challenges);

	ctx->response->resend_credentials = resend_needed(ctx->client,
	                                                  ctx->response);

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	/* Stop parsing. */
	http_parser_pause(parser, 1);

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	if (ctx->response->content_type || ctx->response->chunked)
		ctx->client->state = READING_BODY;
	else
		ctx->client->state = DONE;

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	return 0;
}

static int on_body(http_parser *parser, const char *buf, size_t len)
{
	http_parser_context *ctx = (http_parser_context *) parser->data;
	size_t max_len;

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	/* Saw data when we expected not to (eg, in consume_response_body) */
	if (ctx->output_buf == NULL && ctx->output_size == 0) {
		ctx->parse_status = PARSE_STATUS_NO_OUTPUT;
		return 0;
	}

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	assert(ctx->output_size >= ctx->output_written);

	max_len = min(ctx->output_size - ctx->output_written, len);
	max_len = min(max_len, INT_MAX);

	memcpy(ctx->output_buf + ctx->output_written, buf, max_len);
	ctx->output_written += max_len;

	return 0;
}

static int on_message_complete(http_parser *parser)
{
	http_parser_context *ctx = (http_parser_context *) parser->data;

	ctx->client->state = DONE;
	return 0;
}

GIT_INLINE(int) stream_write(
	git_http_server *server,
	const char *data,
	size_t len)
{
	git_trace(GIT_TRACE_TRACE,
	          "Sending request:\n%.*s", (int)len, data);

	return git_stream__write_full(server->stream, data, len, 0);
}

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GIT_INLINE(int) client_write_request(git_http_client *client)
{
	git_stream *stream = client->current_server == PROXY ?
		             client->proxy.stream : client->server.stream;

	git_trace(GIT_TRACE_TRACE,
	          "Sending request:\n%.*s",
	          (int)client->request_msg.size, client->request_msg.ptr);

	return git_stream__write_full(stream,
				      client->request_msg.ptr,
	                              client->request_msg.size,
				      0);
}

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static const char *name_for_method(git_http_method method)
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{
	switch (method) {
	case GIT_HTTP_METHOD_GET:
		return "GET";
	case GIT_HTTP_METHOD_POST:
		return "POST";
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	case GIT_HTTP_METHOD_CONNECT:
		return "CONNECT";
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	}

	return NULL;
}

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/*
 * Find the scheme that is suitable for the given credentials, based on the
 * server's auth challenges.
 */
static bool best_scheme_and_challenge(
	git_http_auth_scheme **scheme_out,
	const char **challenge_out,
	git_vector *challenges,
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	git_credential *credentials)
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{
	const char *challenge;
	size_t i, j;

	for (i = 0; i < ARRAY_SIZE(auth_schemes); i++) {
		git_vector_foreach(challenges, j, challenge) {
			git_http_auth_scheme *scheme = &auth_schemes[i];

			if (challenge_matches_scheme(challenge, scheme) &&
			    (scheme->credtypes & credentials->credtype)) {
				*scheme_out = scheme;
				*challenge_out = challenge;
				return true;
			}
		}
	}

	return false;
}

/*
 * Find the challenge from the server for our current auth context.
 */
static const char *challenge_for_context(
	git_vector *challenges,
	git_http_auth_context *auth_ctx)
{
	const char *challenge;
	size_t i, j;

	for (i = 0; i < ARRAY_SIZE(auth_schemes); i++) {
		if (auth_schemes[i].type == auth_ctx->type) {
			git_http_auth_scheme *scheme = &auth_schemes[i];

			git_vector_foreach(challenges, j, challenge) {
				if (challenge_matches_scheme(challenge, scheme))
					return challenge;
			}
		}
	}

	return NULL;
}

static const char *init_auth_context(
	git_http_server *server,
	git_vector *challenges,
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	git_credential *credentials)
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{
	git_http_auth_scheme *scheme;
	const char *challenge;
	int error;

	if (!best_scheme_and_challenge(&scheme, &challenge, challenges, credentials)) {
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		git_error_set(GIT_ERROR_HTTP, "could not find appropriate mechanism for credentials");
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		return NULL;
	}

	error = scheme->init_context(&server->auth_context, &server->url);

	if (error == GIT_PASSTHROUGH) {
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		git_error_set(GIT_ERROR_HTTP, "'%s' authentication is not supported", scheme->name);
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		return NULL;
	}

	return challenge;
}

static void free_auth_context(git_http_server *server)
{
	if (!server->auth_context)
		return;

	if (server->auth_context->free)
		server->auth_context->free(server->auth_context);

	server->auth_context = NULL;
}

static int apply_credentials(
	git_buf *buf,
	git_http_server *server,
	const char *header_name,
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	git_credential *credentials)
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{
	git_http_auth_context *auth = server->auth_context;
	git_vector *challenges = &server->auth_challenges;
	const char *challenge;
	git_buf token = GIT_BUF_INIT;
	int error = 0;

	/* We've started a new request without creds; free the context. */
	if (auth && !credentials) {
		free_auth_context(server);
		return 0;
	}

	/* We haven't authenticated, nor were we asked to.  Nothing to do. */
	if (!auth && !git_vector_length(challenges))
		return 0;

	if (!auth) {
		challenge = init_auth_context(server, challenges, credentials);
		auth = server->auth_context;

		if (!challenge || !auth) {
			error = -1;
			goto done;
		}
	} else if (auth->set_challenge) {
		challenge = challenge_for_context(challenges, auth);
	}

	if (auth->set_challenge && challenge &&
	    (error = auth->set_challenge(auth, challenge)) < 0)
		goto done;

	if ((error = auth->next_token(&token, auth, credentials)) < 0)
		goto done;

	if (auth->is_complete && auth->is_complete(auth)) {
		/*
		 * If we're done with an auth mechanism with connection affinity,
		 * we don't need to send any more headers and can dispose the context.
		 */
		if (auth->connection_affinity)
			free_auth_context(server);
	} else if (!token.size) {
Utkarsh Gupta committed
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		git_error_set(GIT_ERROR_HTTP, "failed to respond to authentication challenge");
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		error = -1;
		goto done;
	}

	if (token.size > 0)
		error = git_buf_printf(buf, "%s: %s\r\n", header_name, token.ptr);

done:
	git_buf_dispose(&token);
	return error;
}

GIT_INLINE(int) apply_server_credentials(
	git_buf *buf,
	git_http_client *client,
	git_http_request *request)
{
	return apply_credentials(buf,
	                         &client->server,
	                         "Authorization",
	                         request->credentials);
}

GIT_INLINE(int) apply_proxy_credentials(
	git_buf *buf,
	git_http_client *client,
	git_http_request *request)
{
	return apply_credentials(buf,
	                         &client->proxy,
	                         "Proxy-Authorization",
	                         request->proxy_credentials);
}

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static int generate_connect_request(
	git_http_client *client,
	git_http_request *request)
{
	git_buf *buf;
	int error;

	git_buf_clear(&client->request_msg);
	buf = &client->request_msg;

	git_buf_printf(buf, "CONNECT %s:%s HTTP/1.1\r\n",
	               client->server.url.host, client->server.url.port);

	git_buf_puts(buf, "User-Agent: ");
	git_http__user_agent(buf);
	git_buf_puts(buf, "\r\n");

	git_buf_printf(buf, "Host: %s\r\n", client->proxy.url.host);

	if ((error = apply_proxy_credentials(buf, client, request) < 0))
		return -1;

	git_buf_puts(buf, "\r\n");

	return git_buf_oom(buf) ? -1 : 0;
}

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static int generate_request(
	git_http_client *client,
	git_http_request *request)
{
	git_buf *buf;
	size_t i;
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	int error;
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	assert(client && request);

	git_buf_clear(&client->request_msg);
	buf = &client->request_msg;

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	/* GET|POST path HTTP/1.1 */
	git_buf_puts(buf, name_for_method(request->method));
	git_buf_putc(buf, ' ');
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	if (request->proxy && strcmp(request->url->scheme, "https"))
		git_net_url_fmt(buf, request->url);
	else
		git_net_url_fmt_path(buf, request->url);

	git_buf_puts(buf, " HTTP/1.1\r\n");
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	git_buf_puts(buf, "User-Agent: ");
	git_http__user_agent(buf);
	git_buf_puts(buf, "\r\n");
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	git_buf_printf(buf, "Host: %s", request->url->host);

	if (!git_net_url_is_default_port(request->url))
		git_buf_printf(buf, ":%s", request->url->port);

	git_buf_puts(buf, "\r\n");

	if (request->accept)
		git_buf_printf(buf, "Accept: %s\r\n", request->accept);
	else
		git_buf_puts(buf, "Accept: */*\r\n");

	if (request->content_type)
		git_buf_printf(buf, "Content-Type: %s\r\n",
			request->content_type);

	if (request->chunked)
		git_buf_puts(buf, "Transfer-Encoding: chunked\r\n");

	if (request->content_length > 0)
		git_buf_printf(buf, "Content-Length: %"PRIuZ "\r\n",
			request->content_length);

	if (request->expect_continue)
		git_buf_printf(buf, "Expect: 100-continue\r\n");

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	if ((error = apply_server_credentials(buf, client, request)) < 0 ||
	    (error = apply_proxy_credentials(buf, client, request)) < 0)
		return error;

718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757
	if (request->custom_headers) {
		for (i = 0; i < request->custom_headers->count; i++) {
			const char *hdr = request->custom_headers->strings[i];

			if (hdr)
				git_buf_printf(buf, "%s\r\n", hdr);
		}
	}

	git_buf_puts(buf, "\r\n");

	if (git_buf_oom(buf))
		return -1;

	return 0;
}

static int check_certificate(
	git_stream *stream,
	git_net_url *url,
	int is_valid,
	git_transport_certificate_check_cb cert_cb,
	void *cert_cb_payload)
{
	git_cert *cert;
	git_error_state last_error = {0};
	int error;

	if ((error = git_stream_certificate(&cert, stream)) < 0)
		return error;

	git_error_state_capture(&last_error, GIT_ECERTIFICATE);

	error = cert_cb(cert, is_valid, url->host, cert_cb_payload);

	if (error == GIT_PASSTHROUGH && !is_valid)
		return git_error_state_restore(&last_error);
	else if (error == GIT_PASSTHROUGH)
		error = 0;
	else if (error && !git_error_last())
758
		git_error_set(GIT_ERROR_HTTP,
759 760 761 762 763 764
		              "user rejected certificate for %s", url->host);

	git_error_state_free(&last_error);
	return error;
}

765 766
static int server_connect_stream(
	git_http_server *server,
767 768 769 770 771
	git_transport_certificate_check_cb cert_cb,
	void *cb_payload)
{
	int error;

772
	GIT_ERROR_CHECK_VERSION(server->stream, GIT_STREAM_VERSION, "git_stream");
773

774
	error = git_stream_connect(server->stream);
775 776 777 778

	if (error && error != GIT_ECERTIFICATE)
		return error;

779 780
	if (git_stream_is_encrypted(server->stream) && cert_cb != NULL)
		error = check_certificate(server->stream, &server->url, !error,
781 782 783 784 785
		                          cert_cb, cb_payload);

	return error;
}

786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803
static void reset_auth_connection(git_http_server *server)
{
	/*
	 * If we've authenticated and we're doing "normal"
	 * authentication with a request affinity (Basic, Digest)
	 * then we want to _keep_ our context, since authentication
	 * survives even through non-keep-alive connections.  If
	 * we've authenticated and we're doing connection-based
	 * authentication (NTLM, Negotiate) - indicated by the presence
	 * of an `is_complete` callback - then we need to restart
	 * authentication on a new connection.
	 */

	if (server->auth_context &&
	    server->auth_context->connection_affinity)
		free_auth_context(server);
}

804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833
/*
 * Updates the server data structure with the new URL; returns 1 if the server
 * has changed and we need to reconnect, returns 0 otherwise.
 */
GIT_INLINE(int) server_setup_from_url(
	git_http_server *server,
	git_net_url *url)
{
	if (!server->url.scheme || strcmp(server->url.scheme, url->scheme) ||
	    !server->url.host || strcmp(server->url.host, url->host) ||
	    !server->url.port || strcmp(server->url.port, url->port)) {
		git__free(server->url.scheme);
		git__free(server->url.host);
		git__free(server->url.port);

		server->url.scheme = git__strdup(url->scheme);
		GIT_ERROR_CHECK_ALLOC(server->url.scheme);

		server->url.host = git__strdup(url->host);
		GIT_ERROR_CHECK_ALLOC(server->url.host);

		server->url.port = git__strdup(url->port);
		GIT_ERROR_CHECK_ALLOC(server->url.port);

		return 1;
	}

	return 0;
}

834 835 836 837 838 839
static void reset_parser(git_http_client *client)
{
	http_parser_init(&client->parser, HTTP_RESPONSE);
}

static int setup_hosts(
840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857
	git_http_client *client,
	git_http_request *request)
{
	int ret, diff = 0;

	assert(client && request && request->url);

	if ((ret = server_setup_from_url(&client->server, request->url)) < 0)
		return ret;

	diff |= ret;

	if (request->proxy &&
	    (ret = server_setup_from_url(&client->proxy, request->proxy)) < 0)
		return ret;

	diff |= ret;

858 859 860 861
	if (diff) {
		free_auth_context(&client->server);
		free_auth_context(&client->proxy);

862
		client->connected = 0;
863
	}
864 865 866 867

	return 0;
}

868
GIT_INLINE(int) server_create_stream(git_http_server *server)
869
{
870 871 872 873 874 875 876
	git_net_url *url = &server->url;

	if (strcasecmp(url->scheme, "https") == 0)
		return git_tls_stream_new(&server->stream, url->host, url->port);
	else if (strcasecmp(url->scheme, "http") == 0)
		return git_socket_stream_new(&server->stream, url->host, url->port);

877
	git_error_set(GIT_ERROR_HTTP, "unknown http scheme '%s'", url->scheme);
878
	return -1;
879 880
}

881 882 883 884 885 886 887 888 889 890 891
GIT_INLINE(void) save_early_response(
	git_http_client *client,
	git_http_response *response)
{
	/* Buffer the response so we can return it in read_response */
	client->state = HAS_EARLY_RESPONSE;

	memcpy(&client->early_response, response, sizeof(git_http_response));
	memset(response, 0, sizeof(git_http_response));
}

892 893 894
static int proxy_connect(
	git_http_client *client,
	git_http_request *request)
895
{
896
	git_http_response response = {0};
897 898
	int error;

899 900 901
	if (!client->proxy_connected || !client->keepalive) {
		git_trace(GIT_TRACE_DEBUG, "Connecting to proxy %s:%s",
			  client->proxy.url.host, client->proxy.url.port);
902

903 904 905 906 907
		if ((error = server_create_stream(&client->proxy)) < 0 ||
		    (error = server_connect_stream(&client->proxy,
			client->opts.proxy_certificate_check_cb,
			client->opts.proxy_certificate_check_payload)) < 0)
			goto done;
908

909
		client->proxy_connected = 1;
910 911
	}

912 913
	client->current_server = PROXY;
	client->state = SENDING_REQUEST;
914

915 916 917
	if ((error = generate_connect_request(client, request)) < 0 ||
	    (error = client_write_request(client)) < 0)
		goto done;
918

919
	client->state = SENT_REQUEST;
920

921 922 923
	if ((error = git_http_client_read_response(&response, client)) < 0 ||
	    (error = git_http_client_skip_body(client)) < 0)
		goto done;
924

925
	assert(client->state == DONE);
926

927
	if (response.status == GIT_HTTP_STATUS_PROXY_AUTHENTICATION_REQUIRED) {
928
		save_early_response(client, &response);
929 930 931

		error = GIT_RETRY;
		goto done;
932
	} else if (response.status != GIT_HTTP_STATUS_OK) {
933
		git_error_set(GIT_ERROR_HTTP, "proxy returned unexpected status: %d", response.status);
934
		error = -1;
935
		goto done;
936 937
	}

938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959
	reset_parser(client);
	client->state = NONE;

done:
	git_http_response_dispose(&response);
	return error;
}

static int server_connect(git_http_client *client)
{
	git_net_url *url = &client->server.url;
	git_transport_certificate_check_cb cert_cb;
	void *cert_payload;
	int error;

	client->current_server = SERVER;

	if (client->proxy.stream)
		error = git_tls_stream_wrap(&client->server.stream, client->proxy.stream, url->host);
	else
		error = server_create_stream(&client->server);

960
	if (error < 0)
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
		goto done;

	cert_cb = client->opts.server_certificate_check_cb;
	cert_payload = client->opts.server_certificate_check_payload;

	error = server_connect_stream(&client->server, cert_cb, cert_payload);

done:
	return error;
}

GIT_INLINE(void) close_stream(git_http_server *server)
{
	if (server->stream) {
		git_stream_close(server->stream);
		git_stream_free(server->stream);
		server->stream = NULL;
	}
}

static int http_client_connect(
	git_http_client *client,
	git_http_request *request)
{
	bool use_proxy = false;
	int error;

	if ((error = setup_hosts(client, request)) < 0)
989 990
		goto on_error;

991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024
	/* We're connected to our destination server; no need to reconnect */
	if (client->connected && client->keepalive &&
	    (client->state == NONE || client->state == DONE))
		return 0;

	client->connected = 0;
	client->request_count = 0;

	close_stream(&client->server);
	reset_auth_connection(&client->server);

	reset_parser(client);

	/* Reconnect to the proxy if necessary. */
	use_proxy = client->proxy.url.host &&
	            !strcmp(client->server.url.scheme, "https");

	if (use_proxy) {
		if (!client->proxy_connected || !client->keepalive ||
		    (client->state != NONE && client->state != DONE)) {
			close_stream(&client->proxy);
			reset_auth_connection(&client->proxy);

			client->proxy_connected = 0;
		}

		if ((error = proxy_connect(client, request)) < 0)
			goto on_error;
	}

	git_trace(GIT_TRACE_DEBUG, "Connecting to remote %s:%s",
	          client->server.url.host, client->server.url.port);

	if ((error = server_connect(client)) < 0)
1025 1026 1027
		goto on_error;

	client->connected = 1;
1028
	return error;
1029 1030

on_error:
1031 1032
	if (error != GIT_RETRY)
		close_stream(&client->proxy);
1033

1034
	close_stream(&client->server);
1035 1036 1037 1038 1039
	return error;
}

GIT_INLINE(int) client_read(git_http_client *client)
{
1040
	http_parser_context *parser_context = client->parser.data;
1041
	git_stream *stream;
1042 1043 1044 1045
	char *buf = client->read_buf.ptr + client->read_buf.size;
	size_t max_len;
	ssize_t read_len;

1046 1047 1048
	stream = client->current_server == PROXY ?
		client->proxy.stream : client->server.stream;

1049 1050 1051 1052 1053 1054 1055 1056
	/*
	 * We use a git_buf for convenience, but statically allocate it and
	 * don't resize.  Limit our consumption to INT_MAX since calling
	 * functions use an int return type to return number of bytes read.
	 */
	max_len = client->read_buf.asize - client->read_buf.size;
	max_len = min(max_len, INT_MAX);

1057 1058 1059
	if (parser_context->output_size)
		max_len = min(max_len, parser_context->output_size);

1060
	if (max_len == 0) {
1061
		git_error_set(GIT_ERROR_HTTP, "no room in output buffer");
1062 1063 1064
		return -1;
	}

1065
	read_len = git_stream_read(stream, buf, max_len);
1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076

	if (read_len >= 0) {
		client->read_buf.size += read_len;

		git_trace(GIT_TRACE_TRACE, "Received:\n%.*s",
		          (int)read_len, buf);
	}

	return (int)read_len;
}

1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094
static bool parser_settings_initialized;
static http_parser_settings parser_settings;

GIT_INLINE(http_parser_settings *) http_client_parser_settings(void)
{
	if (!parser_settings_initialized) {
		parser_settings.on_header_field = on_header_field;
		parser_settings.on_header_value = on_header_value;
		parser_settings.on_headers_complete = on_headers_complete;
		parser_settings.on_body = on_body;
		parser_settings.on_message_complete = on_message_complete;

		parser_settings_initialized = true;
	}

	return &parser_settings;
}

1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117
GIT_INLINE(int) client_read_and_parse(git_http_client *client)
{
	http_parser *parser = &client->parser;
	http_parser_context *ctx = (http_parser_context *) parser->data;
	unsigned char http_errno;
	int read_len;
	size_t parsed_len;

	/*
	 * If we have data in our read buffer, that means we stopped early
	 * when parsing headers.  Use the data in the read buffer instead of
	 * reading more from the socket.
	 */
	if (!client->read_buf.size && (read_len = client_read(client)) < 0)
		return read_len;

	parsed_len = http_parser_execute(parser,
		http_client_parser_settings(),
		client->read_buf.ptr,
		client->read_buf.size);
	http_errno = client->parser.http_errno;

	if (parsed_len > INT_MAX) {
1118
		git_error_set(GIT_ERROR_HTTP, "unexpectedly large parse");
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
		return -1;
	}

	if (ctx->parse_status == PARSE_STATUS_ERROR) {
		client->connected = 0;
		return ctx->error ? ctx->error : -1;
	}

	/*
	 * If we finished reading the headers or body, we paused parsing.
	 * Otherwise the parser will start filling the body, or even parse
	 * a new response if the server pipelined us multiple responses.
	 * (This can happen in response to an expect/continue request,
	 * where the server gives you a 100 and 200 simultaneously.)
	 */
	if (http_errno == HPE_PAUSED) {
		/*
		 * http-parser has a "feature" where it will not deliver the
		 * final byte when paused in a callback.  Consume that byte.
		 * https://github.com/nodejs/http-parser/issues/97
		 */
		assert(client->read_buf.size > parsed_len);

		http_parser_pause(parser, 0);

		parsed_len += http_parser_execute(parser,
			http_client_parser_settings(),
			client->read_buf.ptr + parsed_len,
			1);
	}

	/* Most failures will be reported in http_errno */
	else if (parser->http_errno != HPE_OK) {
1152
		git_error_set(GIT_ERROR_HTTP, "http parser error: %s",
1153 1154 1155 1156 1157 1158
		              http_errno_description(http_errno));
		return -1;
	}

	/* Otherwise we should have consumed the entire buffer. */
	else if (parsed_len != client->read_buf.size) {
1159
		git_error_set(GIT_ERROR_HTTP,
1160 1161 1162 1163 1164 1165 1166
		              "http parser did not consume entire buffer: %s",
			      http_errno_description(http_errno));
		return -1;
	}

	/* recv returned 0, the server hung up on us */
	else if (!parsed_len) {
1167
		git_error_set(GIT_ERROR_HTTP, "unexpected EOF");
1168 1169 1170 1171 1172 1173 1174 1175
		return -1;
	}

	git_buf_consume_bytes(&client->read_buf, parsed_len);

	return (int)parsed_len;
}

1176 1177 1178
/*
 * See if we've consumed the entire response body.  If the client was
 * reading the body but did not consume it entirely, it's possible that
1179 1180 1181 1182 1183
 * they knew that the stream had finished (in a git response, seeing a
 * final flush) and stopped reading.  But if the response was chunked,
 * we may have not consumed the final chunk marker.  Consume it to
 * ensure that we don't have it waiting in our socket.  If there's
 * more than just a chunk marker, close the connection.
1184 1185 1186 1187 1188 1189 1190 1191
 */
static void complete_response_body(git_http_client *client)
{
	http_parser_context parser_context = {0};

	/* If we're not keeping alive, don't bother. */
	if (!client->keepalive) {
		client->connected = 0;
1192
		goto done;
1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205
	}

	parser_context.client = client;
	client->parser.data = &parser_context;

	/* If there was an error, just close the connection. */
	if (client_read_and_parse(client) < 0 ||
	    parser_context.error != HPE_OK ||
	    (parser_context.parse_status != PARSE_STATUS_OK &&
	     parser_context.parse_status != PARSE_STATUS_NO_OUTPUT)) {
		git_error_clear();
		client->connected = 0;
	}
1206 1207 1208

done:
	git_buf_clear(&client->read_buf);
1209 1210 1211 1212 1213 1214
}

int git_http_client_send_request(
	git_http_client *client,
	git_http_request *request)
{
1215
	git_http_response response = {0};
1216 1217 1218 1219 1220 1221 1222 1223
	int error = -1;

	assert(client && request);

	/* If the client did not finish reading, clean up the stream. */
	if (client->state == READING_BODY)
		complete_response_body(client);

1224 1225 1226
	/* If we're waiting for proxy auth, don't sending more requests. */
	if (client->state == HAS_EARLY_RESPONSE)
		return 0;
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236

	if (git_trace_level() >= GIT_TRACE_DEBUG) {
		git_buf url = GIT_BUF_INIT;
		git_net_url_fmt(&url, request->url);
		git_trace(GIT_TRACE_DEBUG, "Sending %s request to %s",
		          name_for_method(request->method),
		          url.ptr ? url.ptr : "<invalid>");
		git_buf_dispose(&url);
	}

1237
	if ((error = http_client_connect(client, request)) < 0 ||
1238
	    (error = generate_request(client, request)) < 0 ||
1239
	    (error = client_write_request(client)) < 0)
1240 1241
		goto done;

1242 1243 1244 1245 1246 1247 1248 1249 1250
	client->state = SENT_REQUEST;

	if (request->expect_continue) {
		if ((error = git_http_client_read_response(&response, client)) < 0 ||
		    (error = git_http_client_skip_body(client)) < 0)
			goto done;

		error = 0;

1251
		if (response.status != GIT_HTTP_STATUS_CONTINUE) {
1252 1253 1254 1255 1256
			save_early_response(client, &response);
			goto done;
		}
	}

1257 1258 1259 1260 1261 1262 1263
	if (request->content_length || request->chunked) {
		client->state = SENDING_BODY;
		client->request_body_len = request->content_length;
		client->request_body_remain = request->content_length;
		client->request_chunked = request->chunked;
	}

1264 1265
	reset_parser(client);

1266
done:
1267 1268 1269
	if (error == GIT_RETRY)
		error = 0;

1270
	git_http_response_dispose(&response);
1271 1272 1273
	return error;
}

1274 1275 1276 1277 1278 1279
bool git_http_client_has_response(git_http_client *client)
{
	return (client->state == HAS_EARLY_RESPONSE ||
	        client->state > SENT_REQUEST);
}

1280 1281 1282 1283 1284 1285 1286 1287 1288
int git_http_client_send_body(
	git_http_client *client,
	const char *buffer,
	size_t buffer_len)
{
	git_http_server *server;
	git_buf hdr = GIT_BUF_INIT;
	int error;

1289 1290 1291 1292 1293 1294 1295
	assert(client);

	/* If we're waiting for proxy auth, don't sending more requests. */
	if (client->state == HAS_EARLY_RESPONSE)
		return 0;

	if (client->state != SENDING_BODY) {
1296
		git_error_set(GIT_ERROR_HTTP, "client is in invalid state");
1297 1298
		return -1;
	}
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331

	if (!buffer_len)
		return 0;

	server = &client->server;

	if (client->request_body_len) {
		assert(buffer_len <= client->request_body_remain);

		if ((error = stream_write(server, buffer, buffer_len)) < 0)
			goto done;

		client->request_body_remain -= buffer_len;
	} else {
		if ((error = git_buf_printf(&hdr, "%" PRIxZ "\r\n", buffer_len)) < 0 ||
		    (error = stream_write(server, hdr.ptr, hdr.size)) < 0 ||
		    (error = stream_write(server, buffer, buffer_len)) < 0 ||
		    (error = stream_write(server, "\r\n", 2)) < 0)
			goto done;
	}

done:
	git_buf_dispose(&hdr);
	return error;
}

static int complete_request(git_http_client *client)
{
	int error = 0;

	assert(client && client->state == SENDING_BODY);

	if (client->request_body_len && client->request_body_remain) {
1332
		git_error_set(GIT_ERROR_HTTP, "truncated write");
1333 1334 1335 1336 1337
		error = -1;
	} else if (client->request_chunked) {
		error = stream_write(&client->server, "0\r\n\r\n", 5);
	}

1338
	client->state = SENT_REQUEST;
1339 1340 1341
	return error;
}

1342 1343 1344 1345 1346 1347 1348 1349 1350 1351
int git_http_client_read_response(
	git_http_response *response,
	git_http_client *client)
{
	http_parser_context parser_context = {0};
	int error;

	assert(response && client);

	if (client->state == SENDING_BODY) {
1352 1353
		if ((error = complete_request(client)) < 0)
			goto done;
1354 1355 1356 1357 1358 1359 1360 1361 1362 1363
	}

	if (client->state == HAS_EARLY_RESPONSE) {
		memcpy(response, &client->early_response, sizeof(git_http_response));
		memset(&client->early_response, 0, sizeof(git_http_response));
		client->state = DONE;
		return 0;
	}

	if (client->state != SENT_REQUEST) {
1364
		git_error_set(GIT_ERROR_HTTP, "client is in invalid state");
1365 1366
		error = -1;
		goto done;
1367 1368
	}

1369 1370
	git_http_response_dispose(response);

1371 1372 1373 1374 1375
	if (client->current_server == PROXY) {
		git_vector_free_deep(&client->proxy.auth_challenges);
	} else if(client->current_server == SERVER) {
		git_vector_free_deep(&client->server.auth_challenges);
	}
1376

1377
	client->state = READING_RESPONSE;
1378
	client->keepalive = 0;
1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409
	client->parser.data = &parser_context;

	parser_context.client = client;
	parser_context.response = response;

	while (client->state == READING_RESPONSE) {
		if ((error = client_read_and_parse(client)) < 0)
			goto done;
	}

	assert(client->state == READING_BODY || client->state == DONE);

done:
	git_buf_dispose(&parser_context.parse_header_name);
	git_buf_dispose(&parser_context.parse_header_value);

	return error;
}

int git_http_client_read_body(
	git_http_client *client,
	char *buffer,
	size_t buffer_size)
{
	http_parser_context parser_context = {0};
	int error = 0;

	if (client->state == DONE)
		return 0;

	if (client->state != READING_BODY) {
1410
		git_error_set(GIT_ERROR_HTTP, "client is in invalid state");
1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425
		return -1;
	}

	/*
	 * Now we'll read from the socket and http_parser will pipeline the
	 * data directly to the client.
	 */

	parser_context.client = client;
	parser_context.output_buf = buffer;
	parser_context.output_size = buffer_size;

	client->parser.data = &parser_context;

	/*
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	 * Clients expect to get a non-zero amount of data from us,
	 * so we either block until we have data to return, until we
	 * hit EOF or there's an error.  Do this in a loop, since we
	 * may end up reading only some stream metadata (like chunk
	 * information).
1431 1432 1433 1434 1435 1436
	 */
	while (!parser_context.output_written) {
		error = client_read_and_parse(client);

		if (error <= 0)
			goto done;
1437 1438 1439

		if (client->state == DONE)
			break;
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	}

	assert(parser_context.output_written <= INT_MAX);
	error = (int)parser_context.output_written;

done:
	if (error < 0)
		client->connected = 0;

	return error;
}

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int git_http_client_skip_body(git_http_client *client)
{
	http_parser_context parser_context = {0};
	int error;

	if (client->state == DONE)
		return 0;

	if (client->state != READING_BODY) {
1461
		git_error_set(GIT_ERROR_HTTP, "client is in invalid state");
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		return -1;
	}

	parser_context.client = client;
	client->parser.data = &parser_context;

	do {
		error = client_read_and_parse(client);

		if (parser_context.error != HPE_OK ||
		    (parser_context.parse_status != PARSE_STATUS_OK &&
		     parser_context.parse_status != PARSE_STATUS_NO_OUTPUT)) {
1474
			git_error_set(GIT_ERROR_HTTP,
1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485
			              "unexpected data handled in callback");
			error = -1;
		}
	} while (!error);

	if (error < 0)
		client->connected = 0;

	return error;
}

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/*
 * Create an http_client capable of communicating with the given remote
 * host.
 */
int git_http_client_new(
	git_http_client **out,
	git_http_client_options *opts)
{
	git_http_client *client;

	assert(out);

	client = git__calloc(1, sizeof(git_http_client));
	GIT_ERROR_CHECK_ALLOC(client);

	git_buf_init(&client->read_buf, GIT_READ_BUFFER_SIZE);
	GIT_ERROR_CHECK_ALLOC(client->read_buf.ptr);

	if (opts)
		memcpy(&client->opts, opts, sizeof(git_http_client_options));

	*out = client;
	return 0;
}

GIT_INLINE(void) http_server_close(git_http_server *server)
{
	if (server->stream) {
		git_stream_close(server->stream);
		git_stream_free(server->stream);
		server->stream = NULL;
	}

	git_net_url_dispose(&server->url);
1520 1521 1522

	git_vector_free_deep(&server->auth_challenges);
	free_auth_context(server);
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}

static void http_client_close(git_http_client *client)
{
	http_server_close(&client->server);
	http_server_close(&client->proxy);

	git_buf_dispose(&client->request_msg);

	client->state = 0;
	client->request_count = 0;
	client->connected = 0;
	client->keepalive = 0;
}

void git_http_client_free(git_http_client *client)
{
	if (!client)
		return;

	http_client_close(client);
	git_buf_dispose(&client->read_buf);
	git__free(client);
}