/*
* 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"
#include "auth.h"
#include "auth_negotiate.h"
#include "auth_ntlm.h"
#include "git2/sys/credential.h"
#include "net.h"
#include "stream.h"
#include "streams/socket.h"
#include "streams/tls.h"
#include "auth.h"
static git_http_auth_scheme auth_schemes[] = {
{ 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 },
};
/*
* 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)
typedef struct {
git_net_url url;
git_stream *stream;
git_vector auth_challenges;
git_http_auth_context *auth_context;
} git_http_server;
typedef enum {
PROXY = 1,
SERVER
} git_http_server_t;
typedef enum {
NONE = 0,
SENDING_REQUEST,
SENDING_BODY,
SENT_REQUEST,
HAS_EARLY_RESPONSE,
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,
PARSE_STATUS_NO_OUTPUT,
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;
/* Are we writing to the proxy or server, and state of the client. */
git_http_server_t current_server;
http_client_state state;
http_parser parser;
git_http_server server;
git_http_server proxy;
unsigned request_count;
unsigned connected : 1,
proxy_connected : 1,
keepalive : 1,
request_chunked : 1;
/* 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;
/*
* 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;
};
bool git_http_response_is_redirect(git_http_response *response)
{
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);
}
void git_http_response_dispose(git_http_response *response)
{
if (!response)
return;
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;
git_http_client *client = ctx->client;
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) {
git_error_set(GIT_ERROR_HTTP,
"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) {
git_error_set(GIT_ERROR_HTTP,
"multiple content-length headers");
return -1;
}
if (git__strntol64(&len, value->ptr, value->size,
NULL, 10) < 0 || len < 0) {
git_error_set(GIT_ERROR_HTTP,
"invalid content-length");
return -1;
}
response->content_length = (size_t)len;
} else if (!strcasecmp("Transfer-Encoding", name->ptr) &&
!strcasecmp("chunked", value->ptr)) {
ctx->response->chunked = 1;
} 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;
} else if (!strcasecmp("Location", name->ptr)) {
if (response->location) {
git_error_set(GIT_ERROR_HTTP,
"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:
git_error_set(GIT_ERROR_HTTP,
"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:
git_error_set(GIT_ERROR_HTTP,
"header value seen at unexpected time");
return ctx->parse_status = PARSE_STATUS_ERROR;
}
return 0;
}
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;
if (response->status == GIT_HTTP_STATUS_UNAUTHORIZED &&
(auth_context = client->server.auth_context) &&
auth_context->is_complete &&
!auth_context->is_complete(auth_context))
return 1;
if (response->status == GIT_HTTP_STATUS_PROXY_AUTHENTICATION_REQUIRED &&
(auth_context = client->proxy.auth_context) &&
auth_context->is_complete &&
!auth_context->is_complete(auth_context))
return 1;
return 0;
}
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:
git_error_set(GIT_ERROR_HTTP,
"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);
/* 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);
/* Stop parsing. */
http_parser_pause(parser, 1);
if (ctx->response->content_type || ctx->response->chunked)
ctx->client->state = READING_BODY;
else
ctx->client->state = DONE;
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;
/* 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;
}
GIT_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);
}
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);
}
static const char *name_for_method(git_http_method method)
{
switch (method) {
case GIT_HTTP_METHOD_GET:
return "GET";
case GIT_HTTP_METHOD_POST:
return "POST";
case GIT_HTTP_METHOD_CONNECT:
return "CONNECT";
}
return NULL;
}
/*
* 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,
git_credential *credentials)
{
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,
git_credential *credentials)
{
git_http_auth_scheme *scheme;
const char *challenge;
int error;
if (!best_scheme_and_challenge(&scheme, &challenge, challenges, credentials)) {
git_error_set(GIT_ERROR_HTTP, "could not find appropriate mechanism for credentials");
return NULL;
}
error = scheme->init_context(&server->auth_context, &server->url);
if (error == GIT_PASSTHROUGH) {
git_error_set(GIT_ERROR_HTTP, "'%s' authentication is not supported", scheme->name);
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,
git_credential *credentials)
{
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) {
git_error_set(GIT_ERROR_HTTP, "failed to respond to authentication challenge");
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);
}
static int puts_host_and_port(git_buf *buf, git_net_url *url, bool force_port)
{
bool ipv6 = git_net_url_is_ipv6(url);
if (ipv6)
git_buf_putc(buf, '[');
git_buf_puts(buf, url->host);
if (ipv6)
git_buf_putc(buf, ']');
if (force_port || !git_net_url_is_default_port(url)) {
git_buf_putc(buf, ':');
git_buf_puts(buf, url->port);
}
return git_buf_oom(buf) ? -1 : 0;
}
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_puts(buf, "CONNECT ");
puts_host_and_port(buf, &client->server.url, true);
git_buf_puts(buf, " HTTP/1.1\r\n");
git_buf_puts(buf, "User-Agent: ");
git_http__user_agent(buf);
git_buf_puts(buf, "\r\n");
git_buf_puts(buf, "Host: ");
puts_host_and_port(buf, &client->proxy.url, false);
git_buf_puts(buf, "\r\n");
if ((error = apply_proxy_credentials(buf, client, request) < 0))
return -1;
git_buf_puts(buf, "\r\n");
return git_buf_oom(buf) ? -1 : 0;
}
static int generate_request(
git_http_client *client,
git_http_request *request)
{
git_buf *buf;
size_t i;
int error;
GIT_ASSERT_ARG(client);
GIT_ASSERT_ARG(request);
git_buf_clear(&client->request_msg);
buf = &client->request_msg;
/* GET|POST path HTTP/1.1 */
git_buf_puts(buf, name_for_method(request->method));
git_buf_putc(buf, ' ');
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");
git_buf_puts(buf, "User-Agent: ");
git_http__user_agent(buf);
git_buf_puts(buf, "\r\n");
git_buf_puts(buf, "Host: ");
puts_host_and_port(buf, request->url, false);
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");
if ((error = apply_server_credentials(buf, client, request)) < 0 ||
(error = apply_proxy_credentials(buf, client, request)) < 0)
return error;
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())
git_error_set(GIT_ERROR_HTTP,
"user rejected certificate for %s", url->host);
git_error_state_free(&last_error);
return error;
}
static int server_connect_stream(
git_http_server *server,
git_transport_certificate_check_cb cert_cb,
void *cb_payload)
{
int error;
GIT_ERROR_CHECK_VERSION(server->stream, GIT_STREAM_VERSION, "git_stream");
error = git_stream_connect(server->stream);
if (error && error != GIT_ECERTIFICATE)
return error;
if (git_stream_is_encrypted(server->stream) && cert_cb != NULL)
error = check_certificate(server->stream, &server->url, !error,
cert_cb, cb_payload);
return error;
}
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);
}
/*
* 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;
}
static void reset_parser(git_http_client *client)
{
http_parser_init(&client->parser, HTTP_RESPONSE);
}
static int setup_hosts(
git_http_client *client,
git_http_request *request)
{
int ret, diff = 0;
GIT_ASSERT_ARG(client);
GIT_ASSERT_ARG(request);
GIT_ASSERT(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;
if (diff) {
free_auth_context(&client->server);
free_auth_context(&client->proxy);
client->connected = 0;
}
return 0;
}
GIT_INLINE(int) server_create_stream(git_http_server *server)
{
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);
git_error_set(GIT_ERROR_HTTP, "unknown http scheme '%s'", url->scheme);
return -1;
}
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));
}
static int proxy_connect(
git_http_client *client,
git_http_request *request)
{
git_http_response response = {0};
int error;
if (!client->proxy_connected || !client->keepalive) {
git_trace(GIT_TRACE_DEBUG, "Connecting to proxy %s port %s",
client->proxy.url.host, client->proxy.url.port);
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;
client->proxy_connected = 1;
}
client->current_server = PROXY;
client->state = SENDING_REQUEST;
if ((error = generate_connect_request(client, request)) < 0 ||
(error = client_write_request(client)) < 0)
goto done;
client->state = SENT_REQUEST;
if ((error = git_http_client_read_response(&response, client)) < 0 ||
(error = git_http_client_skip_body(client)) < 0)
goto done;
GIT_ASSERT(client->state == DONE);
if (response.status == GIT_HTTP_STATUS_PROXY_AUTHENTICATION_REQUIRED) {
save_early_response(client, &response);
error = GIT_RETRY;
goto done;
} else if (response.status != GIT_HTTP_STATUS_OK) {
git_error_set(GIT_ERROR_HTTP, "proxy returned unexpected status: %d", response.status);
error = -1;
goto done;
}
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);
if (error < 0)
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)
goto on_error;
/* 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 port %s",
client->server.url.host, client->server.url.port);
if ((error = server_connect(client)) < 0)
goto on_error;
client->connected = 1;
return error;
on_error:
if (error != GIT_RETRY)
close_stream(&client->proxy);
close_stream(&client->server);
return error;
}
GIT_INLINE(int) client_read(git_http_client *client)
{
http_parser_context *parser_context = client->parser.data;
git_stream *stream;
char *buf = client->read_buf.ptr + client->read_buf.size;
size_t max_len;
ssize_t read_len;
stream = client->current_server == PROXY ?
client->proxy.stream : client->server.stream;
/*
* 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);
if (parser_context->output_size)
max_len = min(max_len, parser_context->output_size);
if (max_len == 0) {
git_error_set(GIT_ERROR_HTTP, "no room in output buffer");
return -1;
}
read_len = git_stream_read(stream, buf, max_len);
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;
}
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;
}
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) {
git_error_set(GIT_ERROR_HTTP, "unexpectedly large parse");
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
*/
GIT_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) {
git_error_set(GIT_ERROR_HTTP, "http parser error: %s",
http_errno_description(http_errno));
return -1;
}
/* Otherwise we should have consumed the entire buffer. */
else if (parsed_len != client->read_buf.size) {
git_error_set(GIT_ERROR_HTTP,
"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) {
git_error_set(GIT_ERROR_HTTP, "unexpected EOF");
return -1;
}
git_buf_consume_bytes(&client->read_buf, parsed_len);
return (int)parsed_len;
}
/*
* 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
* 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.
*/
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;
goto done;
}
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;
}
done:
git_buf_clear(&client->read_buf);
}
int git_http_client_send_request(
git_http_client *client,
git_http_request *request)
{
git_http_response response = {0};
int error = -1;
GIT_ASSERT_ARG(client);
GIT_ASSERT_ARG(request);
/* If the client did not finish reading, clean up the stream. */
if (client->state == READING_BODY)
complete_response_body(client);
/* If we're waiting for proxy auth, don't sending more requests. */
if (client->state == HAS_EARLY_RESPONSE)
return 0;
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);
}
if ((error = http_client_connect(client, request)) < 0 ||
(error = generate_request(client, request)) < 0 ||
(error = client_write_request(client)) < 0)
goto done;
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;
if (response.status != GIT_HTTP_STATUS_CONTINUE) {
save_early_response(client, &response);
goto done;
}
}
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;
}
reset_parser(client);
done:
if (error == GIT_RETRY)
error = 0;
git_http_response_dispose(&response);
return error;
}
bool git_http_client_has_response(git_http_client *client)
{
return (client->state == HAS_EARLY_RESPONSE ||
client->state > SENT_REQUEST);
}
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;
GIT_ASSERT_ARG(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) {
git_error_set(GIT_ERROR_HTTP, "client is in invalid state");
return -1;
}
if (!buffer_len)
return 0;
server = &client->server;
if (client->request_body_len) {
GIT_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;
GIT_ASSERT_ARG(client);
GIT_ASSERT(client->state == SENDING_BODY);
if (client->request_body_len && client->request_body_remain) {
git_error_set(GIT_ERROR_HTTP, "truncated write");
error = -1;
} else if (client->request_chunked) {
error = stream_write(&client->server, "0\r\n\r\n", 5);
}
client->state = SENT_REQUEST;
return error;
}
int git_http_client_read_response(
git_http_response *response,
git_http_client *client)
{
http_parser_context parser_context = {0};
int error;
GIT_ASSERT_ARG(response);
GIT_ASSERT_ARG(client);
if (client->state == SENDING_BODY) {
if ((error = complete_request(client)) < 0)
goto done;
}
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) {
git_error_set(GIT_ERROR_HTTP, "client is in invalid state");
error = -1;
goto done;
}
git_http_response_dispose(response);
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);
}
client->state = READING_RESPONSE;
client->keepalive = 0;
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;
}
GIT_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) {
git_error_set(GIT_ERROR_HTTP, "client is in invalid state");
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;
/*
* 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).
*/
while (!parser_context.output_written) {
error = client_read_and_parse(client);
if (error <= 0)
goto done;
if (client->state == DONE)
break;
}
GIT_ASSERT(parser_context.output_written <= INT_MAX);
error = (int)parser_context.output_written;
done:
if (error < 0)
client->connected = 0;
return error;
}
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) {
git_error_set(GIT_ERROR_HTTP, "client is in invalid state");
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)) {
git_error_set(GIT_ERROR_HTTP,
"unexpected data handled in callback");
error = -1;
}
} while (!error);
if (error < 0)
client->connected = 0;
return error;
}
/*
* 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;
GIT_ASSERT_ARG(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);
git_vector_free_deep(&server->auth_challenges);
free_auth_context(server);
}
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);
}
