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SSLproxy/protohttp.c

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/*-
* SSLsplit - transparent SSL/TLS interception
* https://www.roe.ch/SSLsplit
*
* Copyright (c) 2009-2019, Daniel Roethlisberger <daniel@roe.ch>.
* Copyright (c) 2017-2019, Soner Tari <sonertari@gmail.com>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "protohttp.h"
#include "protossl.h"
#include "util.h"
#include "base64.h"
#include "url.h"
#include <string.h>
#include <event2/bufferevent.h>
typedef struct protohttp_ctx protohttp_ctx_t;
struct protohttp_ctx {
unsigned int seen_req_header : 1; /* 0 until request header complete */
unsigned int seen_resp_header : 1; /* 0 until response hdr complete */
unsigned int sent_http_conn_close : 1; /* 0 until Conn: close sent */
unsigned int ocsp_denied : 1; /* 1 if OCSP was denied */
/* log strings from HTTP request */
char *http_method;
char *http_uri;
char *http_host;
char *http_content_type;
/* log strings from HTTP response */
char *http_status_code;
char *http_status_text;
char *http_content_length;
unsigned int not_valid : 1; /* 1 if cannot find HTTP on first line */
unsigned int seen_keyword_count;
long long unsigned int seen_bytes;
};
static void NONNULL(1)
protohttp_log_connect(pxy_conn_ctx_t *ctx)
{
protohttp_ctx_t *http_ctx = ctx->protoctx->arg;
char *msg;
#ifdef HAVE_LOCAL_PROCINFO
char *lpi = NULL;
#endif /* HAVE_LOCAL_PROCINFO */
int rv;
#ifdef HAVE_LOCAL_PROCINFO
if (ctx->global->lprocinfo) {
rv = asprintf(&lpi, "lproc:%i:%s:%s:%s",
ctx->lproc.pid,
STRORDASH(ctx->lproc.user),
STRORDASH(ctx->lproc.group),
STRORDASH(ctx->lproc.exec_path));
if ((rv < 0) || !lpi) {
ctx->enomem = 1;
goto out;
}
}
#endif /* HAVE_LOCAL_PROCINFO */
/*
* The following ifdef's within asprintf arguments list generates
* warnings with -Wembedded-directive on some compilers.
* Not fixing the code in order to avoid more code duplication.
*/
if (!ctx->spec->ssl) {
rv = asprintf(&msg, "CONN: http %s %s %s %s %s %s %s %s %s"
#ifdef HAVE_LOCAL_PROCINFO
" %s"
#endif /* HAVE_LOCAL_PROCINFO */
"%s user:%s\n",
STRORDASH(ctx->srchost_str),
STRORDASH(ctx->srcport_str),
STRORDASH(ctx->dsthost_str),
STRORDASH(ctx->dstport_str),
STRORDASH(http_ctx->http_host),
STRORDASH(http_ctx->http_method),
STRORDASH(http_ctx->http_uri),
STRORDASH(http_ctx->http_status_code),
STRORDASH(http_ctx->http_content_length),
#ifdef HAVE_LOCAL_PROCINFO
lpi,
#endif /* HAVE_LOCAL_PROCINFO */
http_ctx->ocsp_denied ? " ocsp:denied" : "",
STRORDASH(ctx->user));
} else {
rv = asprintf(&msg, "CONN: https %s %s %s %s %s %s %s %s %s "
"sni:%s names:%s "
"sproto:%s:%s dproto:%s:%s "
"origcrt:%s usedcrt:%s"
#ifdef HAVE_LOCAL_PROCINFO
" %s"
#endif /* HAVE_LOCAL_PROCINFO */
"%s user:%s\n",
STRORDASH(ctx->srchost_str),
STRORDASH(ctx->srcport_str),
STRORDASH(ctx->dsthost_str),
STRORDASH(ctx->dstport_str),
STRORDASH(http_ctx->http_host),
STRORDASH(http_ctx->http_method),
STRORDASH(http_ctx->http_uri),
STRORDASH(http_ctx->http_status_code),
STRORDASH(http_ctx->http_content_length),
STRORDASH(ctx->sslctx->sni),
STRORDASH(ctx->sslctx->ssl_names),
SSL_get_version(ctx->src.ssl),
SSL_get_cipher(ctx->src.ssl),
STRORDASH(ctx->sslctx->srvdst_ssl_version),
STRORDASH(ctx->sslctx->srvdst_ssl_cipher),
STRORDASH(ctx->sslctx->origcrtfpr),
STRORDASH(ctx->sslctx->usedcrtfpr),
#ifdef HAVE_LOCAL_PROCINFO
lpi,
#endif /* HAVE_LOCAL_PROCINFO */
http_ctx->ocsp_denied ? " ocsp:denied" : "",
STRORDASH(ctx->user));
}
if ((rv < 0 ) || !msg) {
ctx->enomem = 1;
goto out;
}
if (!ctx->global->detach) {
log_err_printf("%s", msg);
} else if (ctx->global->statslog) {
if (log_conn(msg) == -1) {
log_err_level_printf(LOG_WARNING, "Conn logging failed\n");
}
}
if (ctx->global->connectlog) {
if (log_connect_print_free(msg) == -1) {
free(msg);
log_err_level_printf(LOG_WARNING, "Connection logging failed\n");
}
} else {
free(msg);
}
out:
#ifdef HAVE_LOCAL_PROCINFO
if (lpi) {
free(lpi);
}
#endif /* HAVE_LOCAL_PROCINFO */
return;
}
/*
* Return 1 if uri is an OCSP GET URI, 0 if not.
*/
static int NONNULL(1,2)
protohttp_ocsp_is_valid_uri(const char *uri, pxy_conn_ctx_t *ctx)
{
char *buf_url;
size_t sz_url;
char *buf_b64;
size_t sz_b64;
unsigned char *buf_asn1;
size_t sz_asn1;
int ret;
buf_url = strrchr(uri, '/');
if (!buf_url)
return 0;
buf_url++;
/*
* Do some quick checks to avoid unnecessary buffer allocations and
* decoding URL, Base64 and ASN.1:
* - OCSP requests begin with a SEQUENCE (0x30), so the first Base64
* byte is 'M' or, unlikely but legal, the URL encoding thereof.
* - There should be no query string in OCSP GET requests.
* - Encoded OCSP request ASN.1 blobs are longer than 32 bytes.
*/
if (buf_url[0] != 'M' && buf_url[0] != '%')
return 0;
if (strchr(uri, '?'))
return 0;
sz_url = strlen(buf_url);
if (sz_url < 32)
return 0;
buf_b64 = url_dec(buf_url, sz_url, &sz_b64);
if (!buf_b64) {
ctx->enomem = 1;
return 0;
}
buf_asn1 = base64_dec(buf_b64, sz_b64, &sz_asn1);
if (!buf_asn1) {
ctx->enomem = 1;
free(buf_b64);
return 0;
}
ret = ssl_is_ocspreq(buf_asn1, sz_asn1);
free(buf_asn1);
free(buf_b64);
return ret;
}
/*
* Called after a request header was completely read.
* If the request is an OCSP request, deny the request by sending an
* OCSP response of type tryLater and close the connection to the server.
*
* Reference:
* RFC 2560: X.509 Internet PKI Online Certificate Status Protocol (OCSP)
*/
static void NONNULL(1,2)
protohttp_ocsp_deny(pxy_conn_ctx_t *ctx, protohttp_ctx_t *http_ctx)
{
struct evbuffer *inbuf, *outbuf;
static const char ocspresp[] =
"HTTP/1.0 200 OK\r\n"
"Content-Type: application/ocsp-response\r\n"
"Content-Length: 5\r\n"
"Connection: close\r\n"
"\r\n"
"\x30\x03" /* OCSPResponse: SEQUENCE */
"\x0a\x01" /* OCSPResponseStatus: ENUMERATED */
"\x03"; /* tryLater (3) */
if (!http_ctx->http_method)
return;
if (!strncasecmp(http_ctx->http_method, "GET", 3) &&
protohttp_ocsp_is_valid_uri(http_ctx->http_uri, ctx))
goto deny;
if (!strncasecmp(http_ctx->http_method, "POST", 4) &&
http_ctx->http_content_type &&
!strncasecmp(http_ctx->http_content_type,
"application/ocsp-request", 24))
goto deny;
return;
deny:
inbuf = bufferevent_get_input(ctx->src.bev);
outbuf = bufferevent_get_output(ctx->src.bev);
if (evbuffer_get_length(inbuf) > 0) {
evbuffer_drain(inbuf, evbuffer_get_length(inbuf));
}
// Do not send anything to the child conns
struct evbuffer *dst_outbuf = bufferevent_get_output(ctx->dst.bev);
if (evbuffer_get_length(dst_outbuf) > 0) {
evbuffer_drain(dst_outbuf, evbuffer_get_length(dst_outbuf));
}
// Do not send duplicate OCSP denied responses (child conns may call this function too)
if (http_ctx->ocsp_denied)
return;
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINER, "protohttp_ocsp_deny: Sending OCSP denied response, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
// @todo Wait until ocsp denied msg is sent and then close the conn (in a new http src w cb perhaps)
evbuffer_add_printf(outbuf, ocspresp);
http_ctx->ocsp_denied = 1;
}
/*
* Filter a single line of HTTP request headers.
* Also fills in some context fields for logging.
*
* Returns NULL if the current line should be deleted from the request.
* Returns a newly allocated string if the current line should be replaced.
* Returns 'line' if the line should be kept.
*/
static char * NONNULL(1,2,4)
protohttp_filter_request_header_line(const char *line, protohttp_ctx_t *http_ctx, enum conn_type type, pxy_conn_ctx_t *ctx)
{
/* parse information for connect log */
if (!http_ctx->http_method) {
/* first line */
char *space1, *space2;
space1 = strchr(line, ' ');
space2 = space1 ? strchr(space1 + 1, ' ') : NULL;
if (!space1) {
/* not HTTP */
http_ctx->seen_req_header = 1;
http_ctx->not_valid = 1;
} else {
http_ctx->http_method = malloc(space1 - line + 1);
if (http_ctx->http_method) {
memcpy(http_ctx->http_method, line, space1 - line);
http_ctx->http_method[space1 - line] = '\0';
} else {
ctx->enomem = 1;
return NULL;
}
space1++;
if (!space2) {
/* HTTP/0.9 */
http_ctx->seen_req_header = 1;
space2 = space1 + strlen(space1);
}
http_ctx->http_uri = malloc(space2 - space1 + 1);
if (http_ctx->http_uri) {
memcpy(http_ctx->http_uri, space1, space2 - space1);
http_ctx->http_uri[space2 - space1] = '\0';
} else {
ctx->enomem = 1;
return NULL;
}
}
} else {
/* not first line */
char *newhdr;
if (!http_ctx->http_host && !strncasecmp(line, "Host:", 5)) {
http_ctx->http_host = strdup(util_skipws(line + 5));
if (!http_ctx->http_host) {
ctx->enomem = 1;
return NULL;
}
http_ctx->seen_keyword_count++;
} else if (!strncasecmp(line, "Content-Type:", 13)) {
http_ctx->http_content_type = strdup(util_skipws(line + 13));
if (!http_ctx->http_content_type) {
ctx->enomem = 1;
return NULL;
}
http_ctx->seen_keyword_count++;
/* Override Connection: keepalive and Connection: upgrade */
} else if (!strncasecmp(line, "Connection:", 11)) {
http_ctx->sent_http_conn_close = 1;
if (!(newhdr = strdup("Connection: close"))) {
ctx->enomem = 1;
return NULL;
}
http_ctx->seen_keyword_count++;
return newhdr;
// @attention Always use conn ctx for opts, child ctx does not have opts, see the comments in pxy_conn_child_ctx
} else if (ctx->spec->opts->remove_http_accept_encoding && !strncasecmp(line, "Accept-Encoding:", 16)) {
http_ctx->seen_keyword_count++;
return NULL;
} else if (ctx->spec->opts->remove_http_referer && !strncasecmp(line, "Referer:", 8)) {
http_ctx->seen_keyword_count++;
return NULL;
/* Suppress upgrading to SSL/TLS, WebSockets or HTTP/2 and keep-alive */
} else if (!strncasecmp(line, "Upgrade:", 8) || !strncasecmp(line, "Keep-Alive:", 11)) {
http_ctx->seen_keyword_count++;
return NULL;
} else if ((type == CONN_TYPE_CHILD) && (
// @attention flickr keeps redirecting to https with 301 unless we remove the Via line of squid
// Apparently flickr assumes the existence of Via header field or squid keyword a sign of plain http, even if we are using https
!strncasecmp(line, "Via:", 4) ||
// Also do not send the loopback address to the Internet
!strncasecmp(line, "X-Forwarded-For:", 16))) {
http_ctx->seen_keyword_count++;
return NULL;
} else if (!strncasecmp(line, SSLPROXY_KEY, SSLPROXY_KEY_LEN)) {
// Remove any SSLproxy line, parent or child
return NULL;
} else if (line[0] == '\0') {
http_ctx->seen_req_header = 1;
if (!http_ctx->sent_http_conn_close) {
newhdr = strdup("Connection: close\r\n");
if (!newhdr) {
ctx->enomem = 1;
return NULL;
}
return newhdr;
}
}
}
return (char*)line;
}
static void NONNULL(1,2,3,5)
protohttp_filter_request_header(struct evbuffer *inbuf, struct evbuffer *outbuf, protohttp_ctx_t *http_ctx, enum conn_type type, pxy_conn_ctx_t *ctx)
{
char *line;
while (!http_ctx->seen_req_header && (line = evbuffer_readln(inbuf, NULL, EVBUFFER_EOL_CRLF))) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_filter_request_header: %s, fd=%d\n", line, ctx->fd);
#endif /* DEBUG_PROXY */
char *replace = protohttp_filter_request_header_line(line, http_ctx, type, ctx);
if (replace == line) {
evbuffer_add_printf(outbuf, "%s\r\n", line);
} else if (replace) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINER, "protohttp_filter_request_header: REPLACE= %s, fd=%d\n", replace, ctx->fd);
#endif /* DEBUG_PROXY */
evbuffer_add_printf(outbuf, "%s\r\n", replace);
free(replace);
} else {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINER, "protohttp_filter_request_header: REMOVE= %s, fd=%d\n", line, ctx->fd);
#endif /* DEBUG_PROXY */
if (ctx->enomem) {
return;
}
}
free(line);
if ((type == CONN_TYPE_PARENT) && !ctx->sent_sslproxy_header) {
ctx->sent_sslproxy_header = 1;
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINER, "protohttp_filter_request_header: INSERT= %s, fd=%d\n", ctx->sslproxy_header, ctx->fd);
#endif /* DEBUG_PROXY */
evbuffer_add_printf(outbuf, "%s\r\n", ctx->sslproxy_header);
}
}
if (http_ctx->seen_req_header) {
/* request header complete */
if ((type == CONN_TYPE_PARENT) && ctx->spec->opts->deny_ocsp) {
protohttp_ocsp_deny(ctx, http_ctx);
}
if (ctx->enomem) {
return;
}
/* no data left after parsing headers? */
if (evbuffer_get_length(inbuf) == 0) {
return;
}
evbuffer_add_buffer(outbuf, inbuf);
}
}
static char * NONNULL(1,2)
protohttp_get_url(struct evbuffer *inbuf, pxy_conn_ctx_t *ctx)
{
char *line;
char *path = NULL;
char *host = NULL;
char *url = NULL;
while ((!host || !path) && (line = evbuffer_readln(inbuf, NULL, EVBUFFER_EOL_CRLF))) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_get_url: %s, fd=%d\n", line, ctx->fd);
#endif /* DEBUG_PROXY */
//GET / HTTP/1.1
if (!path && !strncasecmp(line, "GET ", 4)) {
path = strdup(util_skipws(line + 4));
if (!path) {
ctx->enomem = 1;
free(line);
goto memout;
}
path = strsep(&path, " \t");
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_get_url: path=%s, fd=%d\n", path, ctx->fd);
#endif /* DEBUG_PROXY */
//Host: example.com
} else if (!host && !strncasecmp(line, "Host:", 5)) {
host = strdup(util_skipws(line + 5));
if (!host) {
ctx->enomem = 1;
free(line);
goto memout;
}
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_get_url: host=%s, fd=%d\n", host, ctx->fd);
#endif /* DEBUG_PROXY */
}
free(line);
}
if (host && path) {
// Assume that path will always have a leading /, so do not insert an extra / in between host and path
// Don't care about computing the exact url size for plain or secure http (http or https)
// http s :// example.com + / + NULL
// 4 + 1 + 3 + strlen(host) + strlen(path) + 1
size_t url_size = strlen(host) + strlen(path) + 9;
url = malloc(url_size);
if (!url) {
ctx->enomem = 1;
goto memout;
}
snprintf(url, url_size, "http%s://%s%s", ctx->spec->ssl ? "s": "", host, path);
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_get_url: url=%s, fd=%d\n", url, ctx->fd);
#endif /* DEBUG_PROXY */
}
memout:
if (host)
free(host);
if (path)
free(path);
return url;
}
// Size = 39
static char *http_methods[] = { "GET", "PUT", "ICY", "COPY", "HEAD", "LOCK", "MOVE", "POLL", "POST", "BCOPY", "BMOVE", "MKCOL", "TRACE", "LABEL", "MERGE", "DELETE",
"SEARCH", "UNLOCK", "REPORT", "UPDATE", "NOTIFY", "BDELETE", "CONNECT", "OPTIONS", "CHECKIN", "PROPFIND", "CHECKOUT", "CCM_POST", "SUBSCRIBE",
"PROPPATCH", "BPROPFIND", "BPROPPATCH", "UNCHECKOUT", "MKACTIVITY", "MKWORKSPACE", "UNSUBSCRIBE", "RPC_CONNECT", "VERSION-CONTROL", "BASELINE-CONTROL" };
static int NONNULL(1)
protohttp_validate_method(char *method)
{
char *m;
unsigned int i;
for (i = 0; i < sizeof(http_methods)/sizeof(char *); i++) {
m = http_methods[i];
// Compare 1 byte longer than m's len, so that GET1 is not validated as GET
if (!strncasecmp(method, m, strlen(m) + 1)) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_validate_method: Passed method validation: %s\n", method);
#endif /* DEBUG_PROXY */
return 0;
}
}
return -1;
}
static int NONNULL(1,2)
protohttp_validate(protohttp_ctx_t *http_ctx, pxy_conn_ctx_t *ctx)
{
if (http_ctx->not_valid) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_validate: Not http, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
return -1;
}
if (http_ctx->http_method) {
if (protohttp_validate_method(http_ctx->http_method) == -1) {
http_ctx->not_valid = 1;
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_validate: Failed method validation: %s, fd=%d\n", http_ctx->http_method, ctx->fd);
#endif /* DEBUG_PROXY */
return -1;
}
}
if (http_ctx->seen_keyword_count) {
// The first line has been processed successfully
// Pass validation if we have seen at least one http keyword
ctx->protoctx->is_valid = 1;
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_validate: Passed validation, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
return 0;
}
if (http_ctx->seen_bytes > ctx->spec->opts->max_http_header_size) {
// Fail validation if still cannot pass as http after reaching max header size
http_ctx->not_valid = 1;
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_validate: Reached max header size, size=%llu, fd=%d\n", http_ctx->seen_bytes, ctx->fd);
#endif /* DEBUG_PROXY */
return -1;
}
return 0;
}
static void NONNULL(1,2)
protohttp_bev_readcb_src(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
{
static const char redirect[] =
"HTTP/1.1 302 Found\r\n"
"Location: %s\r\n"
"\r\n";
static const char redirect_url[] =
"HTTP/1.1 302 Found\r\n"
"Location: %s?SSLproxy=%s\r\n"
"\r\n";
static const char proto_error[] =
"HTTP/1.1 400 Bad request\r\n"
"Cache-Control: no-cache\r\n"
"Connection: close\r\n"
"Content-Type: text/html\r\n"
"\r\n";
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_bev_readcb_src: ENTER, size=%zu, fd=%d\n",
evbuffer_get_length(bufferevent_get_input(bev)), ctx->fd);
#endif /* DEBUG_PROXY */
if (ctx->dst.closed) {
pxy_discard_inbuf(bev);
return;
}
protohttp_ctx_t *http_ctx = ctx->protoctx->arg;
struct evbuffer *inbuf = bufferevent_get_input(bev);
struct evbuffer *outbuf = bufferevent_get_output(ctx->dst.bev);
if (ctx->spec->opts->user_auth && !ctx->user) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_bev_readcb_src: Redirecting conn, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
char *url = protohttp_get_url(inbuf, ctx);
pxy_discard_inbuf(bev);
if (url) {
evbuffer_add_printf(bufferevent_get_output(bev), redirect_url, ctx->spec->opts->user_auth_url, url);
free(url);
} else {
evbuffer_add_printf(bufferevent_get_output(bev), redirect, ctx->spec->opts->user_auth_url);
}
ctx->sent_userauth_msg = 1;
return;
}
if (ctx->spec->opts->validate_proto && !ctx->protoctx->is_valid) {
http_ctx->seen_bytes += evbuffer_get_length(inbuf);
}
// We insert our special header line to the first packet we get, e.g. right after the first \r\n in the case of http
// @todo Should we look for GET/POST or Host header lines to detect the first packet?
// But there is no guarantee that they will exist, due to fragmentation.
// @attention We cannot append the ssl proxy address at the end of the packet or in between the header and the content,
// because (1) the packet may be just the first fragment split somewhere not appropriate for appending a header,
// and (2) there may not be any content.
// And we are dealing with pop3 and smtp also, not just http.
/* request header munging */
if (!http_ctx->seen_req_header) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_bev_readcb_src: HTTP Request Header, size=%zu, fd=%d\n", evbuffer_get_length(inbuf), ctx->fd);
#endif /* DEBUG_PROXY */
protohttp_filter_request_header(inbuf, outbuf, http_ctx, ctx->type, ctx);
if (ctx->enomem) {
return;
}
} else {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_bev_readcb_src: HTTP Request Body, size=%zu, fd=%d\n", evbuffer_get_length(inbuf), ctx->fd);
#endif /* DEBUG_PROXY */
evbuffer_add_buffer(outbuf, inbuf);
}
if (ctx->spec->opts->validate_proto && !ctx->protoctx->is_valid) {
if (protohttp_validate(http_ctx, ctx) == -1) {
evbuffer_add(bufferevent_get_output(bev), proto_error, strlen(proto_error));
ctx->sent_protoerror_msg = 1;
pxy_discard_inbuf(bev);
evbuffer_drain(outbuf, evbuffer_get_length(outbuf));
return;
}
}
pxy_try_set_watermark(bev, ctx, ctx->dst.bev);
}
/*
* Filter a single line of HTTP response headers.
*
* Returns NULL if the current line should be deleted from the response.
* Returns a newly allocated string if the current line should be replaced.
* Returns `line' if the line should be kept.
*/
static char * NONNULL(1,2,3)
protohttp_filter_response_header_line(const char *line, protohttp_ctx_t *http_ctx, pxy_conn_ctx_t *ctx)
{
/* parse information for connect log */
if (!http_ctx->http_status_code) {
/* first line */
char *space1, *space2;
space1 = strchr(line, ' ');
space2 = space1 ? strchr(space1 + 1, ' ') : NULL;
if (!space1 || !!strncmp(line, "HTTP", 4)) {
/* not HTTP or HTTP/0.9 */
http_ctx->seen_resp_header = 1;
} else {
size_t len_code, len_text;
if (space2) {
len_code = space2 - space1 - 1;
len_text = strlen(space2 + 1);
} else {
len_code = strlen(space1 + 1);
len_text = 0;
}
http_ctx->http_status_code = malloc(len_code + 1);
http_ctx->http_status_text = malloc(len_text + 1);
if (!http_ctx->http_status_code || !http_ctx->http_status_text) {
ctx->enomem = 1;
return NULL;
}
memcpy(http_ctx->http_status_code, space1 + 1, len_code);
http_ctx->http_status_code[len_code] = '\0';
if (space2) {
memcpy(http_ctx->http_status_text,
space2 + 1, len_text);
}
http_ctx->http_status_text[len_text] = '\0';
}
} else {
/* not first line */
if (!http_ctx->http_content_length &&
!strncasecmp(line, "Content-Length:", 15)) {
http_ctx->http_content_length =
strdup(util_skipws(line + 15));
if (!http_ctx->http_content_length) {
ctx->enomem = 1;
return NULL;
}
} else if (
/* HPKP: Public Key Pinning Extension for HTTP
* (draft-ietf-websec-key-pinning)
* remove to prevent public key pinning */
!strncasecmp(line, "Public-Key-Pins:", 16) ||
!strncasecmp(line, "Public-Key-Pins-Report-Only:", 28) ||
/* HSTS: HTTP Strict Transport Security (RFC 6797)
* remove to allow users to accept bad certs */
!strncasecmp(line, "Strict-Transport-Security:", 26) ||
/* Expect-CT: Expect Certificate Transparency
* (draft-ietf-httpbis-expect-ct-latest)
* remove to prevent failed CT log lookups */
!strncasecmp(line, "Expect-CT:", 10) ||
/* Alternate Protocol
* remove to prevent switching to QUIC, SPDY et al */
!strncasecmp(line, "Alternate-Protocol:", 19) ||
/* Upgrade header
* remove to prevent upgrading to HTTPS in unhandled ways,
* and more importantly, WebSockets and HTTP/2 */
!strncasecmp(line, "Upgrade:", 8)) {
return NULL;
} else if (line[0] == '\0') {
http_ctx->seen_resp_header = 1;
}
}
return (char*)line;
}
static void NONNULL(1,2,3,4)
protohttp_filter_response_header(struct evbuffer *inbuf, struct evbuffer *outbuf, protohttp_ctx_t *http_ctx, pxy_conn_ctx_t *ctx)
{
char *line;
while (!http_ctx->seen_resp_header && (line = evbuffer_readln(inbuf, NULL, EVBUFFER_EOL_CRLF))) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_filter_response_header: %s, fd=%d\n", line, ctx->fd);
#endif /* DEBUG_PROXY */
char *replace = protohttp_filter_response_header_line(line, http_ctx, ctx);
if (replace == line) {
evbuffer_add_printf(outbuf, "%s\r\n", line);
} else if (replace) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINER, "protohttp_filter_response_header: REPLACE= %s, fd=%d\n", replace, ctx->fd);
#endif /* DEBUG_PROXY */
evbuffer_add_printf(outbuf, "%s\r\n", replace);
free(replace);
} else {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINER, "protohttp_filter_response_header: REMOVE= %s, fd=%d\n", line, ctx->fd);
#endif /* DEBUG_PROXY */
if (ctx->enomem) {
return;
}
}
free(line);
}
if (http_ctx->seen_resp_header) {
/* no data left after parsing headers? */
if (evbuffer_get_length(inbuf) == 0) {
return;
}
evbuffer_add_buffer(outbuf, inbuf);
}
}
static void NONNULL(1)
protohttp_bev_readcb_dst(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
{
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_bev_readcb_dst: ENTER, size=%zu, fd=%d\n",
evbuffer_get_length(bufferevent_get_input(bev)), ctx->fd);
#endif /* DEBUG_PROXY */
if (ctx->src.closed) {
pxy_discard_inbuf(bev);
return;
}
protohttp_ctx_t *http_ctx = ctx->protoctx->arg;
struct evbuffer *inbuf = bufferevent_get_input(bev);
struct evbuffer *outbuf = bufferevent_get_output(ctx->src.bev);
if (!http_ctx->seen_resp_header) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_bev_readcb_dst: HTTP Response Header, size=%zu, fd=%d\n", evbuffer_get_length(inbuf), ctx->fd);
#endif /* DEBUG_PROXY */
protohttp_filter_response_header(inbuf, outbuf, http_ctx, ctx);
if (ctx->enomem) {
return;
}
} else {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_bev_readcb_dst: HTTP Response Body, size=%zu, fd=%d\n", evbuffer_get_length(inbuf), ctx->fd);
#endif /* DEBUG_PROXY */
evbuffer_add_buffer(outbuf, inbuf);
}
pxy_try_set_watermark(bev, ctx, ctx->src.bev);
}
static void NONNULL(1)
protohttp_bev_readcb_srvdst(UNUSED struct bufferevent *bev, UNUSED pxy_conn_ctx_t *ctx)
{
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINE, "protohttp_bev_readcb_srvdst: readcb called on srvdst, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
log_err_printf("protohttp_bev_readcb_srvdst: readcb called on srvdst\n");
}
static void NONNULL(1)
protohttp_bev_readcb_src_child(struct bufferevent *bev, pxy_conn_child_ctx_t *ctx)
{
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_bev_readcb_src_child: ENTER, size=%zu, child fd=%d, fd=%d\n",
evbuffer_get_length(bufferevent_get_input(bev)), ctx->fd, ctx->conn->fd);
#endif /* DEBUG_PROXY */
if (ctx->dst.closed) {
pxy_discard_inbuf(bev);
return;
}
protohttp_ctx_t *http_ctx = ctx->protoctx->arg;
struct evbuffer *inbuf = bufferevent_get_input(bev);
struct evbuffer *outbuf = bufferevent_get_output(ctx->dst.bev);
if (!http_ctx->seen_req_header) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_bev_readcb_src_child: HTTP Request Header, size=%zu, child fd=%d, fd=%d\n",
evbuffer_get_length(inbuf), ctx->fd, ctx->conn->fd);
#endif /* DEBUG_PROXY */
// @todo Just remove SSLproxy line, do not filter request on the server side?
protohttp_filter_request_header(inbuf, outbuf, http_ctx, ctx->type, ctx->conn);
if (ctx->conn->enomem) {
return;
}
} else {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_bev_readcb_src_child: HTTP Request Body, size=%zu, child fd=%d, fd=%d\n",
evbuffer_get_length(inbuf), ctx->fd, ctx->conn->fd);
#endif /* DEBUG_PROXY */
evbuffer_add_buffer(outbuf, inbuf);
}
pxy_try_set_watermark(bev, ctx->conn, ctx->dst.bev);
}
static void NONNULL(1)
protohttp_bev_readcb_dst_child(struct bufferevent *bev, pxy_conn_child_ctx_t *ctx)
{
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_bev_readcb_dst_child: ENTER, size=%zu, child fd=%d, fd=%d\n",
evbuffer_get_length(bufferevent_get_input(bev)), ctx->fd, ctx->conn->fd);
#endif /* DEBUG_PROXY */
if (ctx->src.closed) {
pxy_discard_inbuf(bev);
return;
}
protohttp_ctx_t *http_ctx = ctx->protoctx->arg;
struct evbuffer *inbuf = bufferevent_get_input(bev);
struct evbuffer *outbuf = bufferevent_get_output(ctx->src.bev);
if (!http_ctx->seen_resp_header) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_bev_readcb_dst_child: HTTP Response Header, size=%zu, child fd=%d, fd=%d\n",
evbuffer_get_length(inbuf), ctx->fd, ctx->conn->fd);
#endif /* DEBUG_PROXY */
// @todo Do not filter response on the server side?
protohttp_filter_response_header(inbuf, outbuf, http_ctx, ctx->conn);
if (ctx->conn->enomem) {
return;
}
} else {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protohttp_bev_readcb_dst_child: HTTP Response Body, size=%zu, child fd=%d, fd=%d\n",
evbuffer_get_length(inbuf), ctx->fd, ctx->conn->fd);
#endif /* DEBUG_PROXY */
evbuffer_add_buffer(outbuf, inbuf);
}
pxy_try_set_watermark(bev, ctx->conn, ctx->src.bev);
}
static void NONNULL(1)
protohttp_bev_readcb(struct bufferevent *bev, void *arg)
{
pxy_conn_ctx_t *ctx = arg;
protohttp_ctx_t *http_ctx = ctx->protoctx->arg;
int seen_resp_header_on_entry = http_ctx->seen_resp_header;
if (bev == ctx->src.bev) {
protohttp_bev_readcb_src(bev, ctx);
} else if (bev == ctx->dst.bev) {
protohttp_bev_readcb_dst(bev, ctx);
} else if (bev == ctx->srvdst.bev) {
protohttp_bev_readcb_srvdst(bev, ctx);
} else {
log_err_printf("protohttp_bev_readcb: UNKWN conn end\n");
return;
}
if (ctx->enomem) {
return;
}
if (!seen_resp_header_on_entry && http_ctx->seen_resp_header) {
/* response header complete: log connection */
if (WANT_CONNECT_LOG(ctx->conn)) {
protohttp_log_connect(ctx);
}
}
}
static void NONNULL(1)
protohttp_bev_readcb_child(struct bufferevent *bev, void *arg)
{
pxy_conn_child_ctx_t *ctx = arg;
if (bev == ctx->src.bev) {
protohttp_bev_readcb_src_child(bev, ctx);
} else if (bev == ctx->dst.bev) {
protohttp_bev_readcb_dst_child(bev, ctx);
} else {
log_err_printf("protohttp_bev_readcb_child: UNKWN conn end\n");
}
}
static void NONNULL(1)
protohttp_free_ctx(protohttp_ctx_t *http_ctx)
{
if (http_ctx->http_method) {
free(http_ctx->http_method);
}
if (http_ctx->http_uri) {
free(http_ctx->http_uri);
}
if (http_ctx->http_host) {
free(http_ctx->http_host);
}
if (http_ctx->http_content_type) {
free(http_ctx->http_content_type);
}
if (http_ctx->http_status_code) {
free(http_ctx->http_status_code);
}
if (http_ctx->http_status_text) {
free(http_ctx->http_status_text);
}
if (http_ctx->http_content_length) {
free(http_ctx->http_content_length);
}
free(http_ctx);
}
static void NONNULL(1)
protohttp_free(pxy_conn_ctx_t *ctx)
{
protohttp_ctx_t *http_ctx = ctx->protoctx->arg;
protohttp_free_ctx(http_ctx);
}
static void NONNULL(1)
protohttps_free(pxy_conn_ctx_t *ctx)
{
protohttp_ctx_t *http_ctx = ctx->protoctx->arg;
protohttp_free_ctx(http_ctx);
protossl_free(ctx);
}
static void NONNULL(1)
protohttp_free_child(pxy_conn_child_ctx_t *ctx)
{
protohttp_ctx_t *http_ctx = ctx->protoctx->arg;
protohttp_free_ctx(http_ctx);
}
protocol_t
protohttp_setup(pxy_conn_ctx_t *ctx)
{
ctx->protoctx->proto = PROTO_HTTP;
ctx->protoctx->bev_readcb = protohttp_bev_readcb;
ctx->protoctx->proto_free = protohttp_free;
ctx->protoctx->arg = malloc(sizeof(protohttp_ctx_t));
if (!ctx->protoctx->arg) {
return PROTO_ERROR;
}
memset(ctx->protoctx->arg, 0, sizeof(protohttp_ctx_t));
return PROTO_HTTP;
}
protocol_t
protohttps_setup(pxy_conn_ctx_t *ctx)
{
ctx->protoctx->proto = PROTO_HTTPS;
ctx->protoctx->connectcb = protossl_conn_connect;
ctx->protoctx->fd_readcb = protossl_fd_readcb;
ctx->protoctx->bev_readcb = protohttp_bev_readcb;
ctx->protoctx->bev_eventcb = protossl_bev_eventcb;
ctx->protoctx->proto_free = protohttps_free;
ctx->protoctx->arg = malloc(sizeof(protohttp_ctx_t));
if (!ctx->protoctx->arg) {
return PROTO_ERROR;
}
memset(ctx->protoctx->arg, 0, sizeof(protohttp_ctx_t));
ctx->sslctx = malloc(sizeof(ssl_ctx_t));
if (!ctx->sslctx) {
free(ctx->protoctx->arg);
return PROTO_ERROR;
}
memset(ctx->sslctx, 0, sizeof(ssl_ctx_t));
return PROTO_HTTPS;
}
protocol_t
protohttp_setup_child(pxy_conn_child_ctx_t *ctx)
{
ctx->protoctx->proto = PROTO_HTTP;
// @todo Should HTTP child conns do any http related processing, so use tcp defaults instead?
ctx->protoctx->bev_readcb = protohttp_bev_readcb_child;
ctx->protoctx->proto_free = protohttp_free_child;
ctx->protoctx->arg = malloc(sizeof(protohttp_ctx_t));
if (!ctx->protoctx->arg) {
return PROTO_ERROR;
}
memset(ctx->protoctx->arg, 0, sizeof(protohttp_ctx_t));
return PROTO_HTTP;
}
protocol_t
protohttps_setup_child(pxy_conn_child_ctx_t *ctx)
{
ctx->protoctx->proto = PROTO_HTTPS;
ctx->protoctx->connectcb = protossl_connect_child;
ctx->protoctx->bev_readcb = protohttp_bev_readcb_child;
ctx->protoctx->bev_eventcb = protossl_bev_eventcb_child;
ctx->protoctx->proto_free = protohttp_free_child;
ctx->protoctx->arg = malloc(sizeof(protohttp_ctx_t));
if (!ctx->protoctx->arg) {
return PROTO_ERROR;
}
memset(ctx->protoctx->arg, 0, sizeof(protohttp_ctx_t));
return PROTO_HTTPS;
}
/* vim: set noet ft=c: */
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