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362 lines
11 KiB
C
362 lines
11 KiB
C
/*-
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* SSLsplit - transparent SSL/TLS interception
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* https://www.roe.ch/SSLsplit
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*
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* Copyright (c) 2009-2018, Daniel Roethlisberger <daniel@roe.ch>.
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* Copyright (c) 2018, Soner Tari <sonertari@gmail.com>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef PXYCONN_H
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#define PXYCONN_H
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#include "proxy.h"
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#include "opts.h"
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#include "attrib.h"
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#include "pxythrmgr.h"
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#include "log.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <event2/buffer.h>
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#include <event2/bufferevent.h>
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/*
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* Print helper for logging code.
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*/
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#define STRORDASH(x) (((x)&&*(x))?(x):"-")
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#define STRORNONE(x) (((x)&&*(x))?(x):"")
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#define WANT_CONNECT_LOG(ctx) ((ctx)->opts->connectlog||!(ctx)->opts->detach)
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#define WANT_CONTENT_LOG(ctx) ((ctx)->opts->contentlog&&((ctx)->proto!=PROTO_PASSTHROUGH))
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#define SSLPROXY_KEY "SSLproxy:"
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#define SSLPROXY_KEY_LEN strlen(SSLPROXY_KEY)
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typedef struct pxy_conn_child_ctx pxy_conn_child_ctx_t;
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typedef void (*fd_readcb_func_t)(evutil_socket_t, short, void *);
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typedef void (*connect_func_t)(pxy_conn_ctx_t *);
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typedef void (*callback_func_t)(struct bufferevent *, void *);
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typedef void (*eventcb_func_t)(struct bufferevent *, short, void *);
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typedef void (*bev_free_func_t)(struct bufferevent *, pxy_conn_ctx_t *);
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typedef void (*proto_free_func_t)(pxy_conn_ctx_t *);
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typedef void (*child_connect_func_t)(pxy_conn_child_ctx_t *);
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typedef void (*child_proto_free_func_t)(pxy_conn_child_ctx_t *);
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/* single socket bufferevent descriptor */
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typedef struct pxy_conn_desc {
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struct bufferevent *bev;
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SSL *ssl;
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unsigned int closed : 1;
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bev_free_func_t free;
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} pxy_conn_desc_t;
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enum conn_type {
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CONN_TYPE_PARENT = 0,
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CONN_TYPE_CHILD,
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};
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typedef enum protocol {
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PROTO_ERROR = -1,
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PROTO_PASSTHROUGH = 0,
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PROTO_HTTP,
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PROTO_HTTPS,
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PROTO_POP3,
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PROTO_POP3S,
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PROTO_SMTP,
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PROTO_SMTPS,
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PROTO_AUTOSSL,
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PROTO_TCP,
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PROTO_SSL,
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} protocol_t;
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typedef struct ssl_ctx ssl_ctx_t;
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typedef struct proto_ctx proto_ctx_t;
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typedef struct proto_child_ctx proto_child_ctx_t;
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struct ssl_ctx {
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/* log strings related to SSL */
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char *ssl_names;
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char *origcrtfpr;
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char *usedcrtfpr;
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/* ssl */
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unsigned int sni_peek_retries : 6; /* max 64 SNI parse retries */
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unsigned int immutable_cert : 1; /* 1 if the cert cannot be changed */
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unsigned int generated_cert : 1; /* 1 if we generated a new cert */
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/* server name indicated by client in SNI TLS extension */
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char *sni;
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X509 *origcrt;
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char *srvdst_ssl_version;
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char *srvdst_ssl_cipher;
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};
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struct proto_ctx {
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protocol_t proto;
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connect_func_t connectcb;
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fd_readcb_func_t fd_readcb;
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callback_func_t bev_readcb;
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callback_func_t bev_writecb;
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eventcb_func_t bev_eventcb;
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proto_free_func_t proto_free;
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// For protocol specific fields, if any
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void *arg;
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};
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struct proto_child_ctx {
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protocol_t proto;
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child_connect_func_t connectcb;
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callback_func_t bev_readcb;
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callback_func_t bev_writecb;
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eventcb_func_t bev_eventcb;
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child_proto_free_func_t proto_free;
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// For protocol specific fields, if any
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void *arg;
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};
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/* parent connection state consisting of three connection descriptors,
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* connection-wide state and the specs and options */
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struct pxy_conn_ctx {
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// Common properties
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// @attention The order of these common vars should match with their order in children
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enum conn_type type;
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pxy_conn_ctx_t *conn; /* parent's conn ctx is itself */
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protocol_t proto;
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/* per-connection state */
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struct pxy_conn_desc src;
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struct pxy_conn_desc dst;
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/* store fd and fd event while connected is 0 */
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evutil_socket_t fd;
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// End of common properties
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proto_ctx_t *protoctx;
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ssl_ctx_t *sslctx;
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/* log strings from socket */
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char *srchost_str;
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char *srcport_str;
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char *dsthost_str;
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char *dstport_str;
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/* content log context */
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log_content_ctx_t logctx;
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/* status flags */
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unsigned int connected : 1; /* 0 until both ends are connected */
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unsigned int enomem : 1; /* 1 if out of memory */
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unsigned int srvdst_connected : 1; /* 0 until server is connected */
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unsigned int dst_connected : 1; /* 0 until dst is connected */
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unsigned int term : 1; /* 0 until term requested */
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unsigned int term_requestor : 1;
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struct pxy_conn_desc srvdst;
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struct event *ev;
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/* original source and destination address, and family */
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struct sockaddr_storage srcaddr;
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socklen_t srcaddrlen;
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struct sockaddr_storage dstaddr;
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socklen_t dstaddrlen;
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int af;
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// Thread that the conn is attached to
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pxy_thr_ctx_t *thr;
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// Unique id of the conn
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long long unsigned int id;
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pxy_thrmgr_ctx_t *thrmgr;
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proxyspec_t *spec;
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opts_t *opts;
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struct event_base *evbase;
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struct evdns_base *dnsbase;
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evutil_socket_t dst_fd;
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evutil_socket_t srvdst_fd;
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// Priv sep socket to obtain a socket for children
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evutil_socket_t clisock;
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// Fd of the listener event for the children
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evutil_socket_t child_fd;
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struct evconnlistener *child_evcl;
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// SSL proxy specific info: ip:port address the children are listening on, orig client addr, and orig target addr
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char *sslproxy_header;
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size_t sslproxy_header_len;
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int sent_sslproxy_header;
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// Child list of the conn
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pxy_conn_child_ctx_t *children;
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// Number of children, active or closed
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unsigned int child_count;
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evutil_socket_t child_src_fd;
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evutil_socket_t child_dst_fd;
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// Conn create time
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time_t ctime;
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// Conn last access time, to determine expired conns
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// Updated on entry to callback functions, parent or child
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time_t atime;
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// Per-thread conn list
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pxy_conn_ctx_t *next;
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// Expired conns are link-listed using this pointer
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pxy_conn_ctx_t *next_expired;
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#ifdef HAVE_LOCAL_PROCINFO
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/* local process information */
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pxy_conn_lproc_desc_t lproc;
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#endif /* HAVE_LOCAL_PROCINFO */
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};
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/* child connection state consisting of two connection descriptors,
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* connection-wide state */
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struct pxy_conn_child_ctx {
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// Common properties
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// @attention The order of these common vars should match with their order in parent
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enum conn_type type;
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pxy_conn_ctx_t *conn; /* parent context */
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protocol_t proto;
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/* per-connection state */
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struct pxy_conn_desc src;
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struct pxy_conn_desc dst;
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/* store fd and fd event while connected is 0 */
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evutil_socket_t fd;
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// End of common properties
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proto_child_ctx_t *protoctx;
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/* status flags */
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unsigned int connected : 1; /* 0 until both ends are connected */
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unsigned int term : 1; /* 0 until term requested */
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// For max fd stats
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evutil_socket_t src_fd;
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evutil_socket_t dst_fd;
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int removed_sslproxy_header;
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// Child index
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unsigned int idx;
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// Children of the conn are link-listed using this pointer
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pxy_conn_child_ctx_t *next;
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};
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int pxy_prepare_logging(pxy_conn_ctx_t *) NONNULL(1);
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int pxy_prepare_logging_local_procinfo(pxy_conn_ctx_t *) NONNULL(1);
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void pxy_log_connect_src(pxy_conn_ctx_t *) NONNULL(1);
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void pxy_log_connect_srvdst(pxy_conn_ctx_t *) NONNULL(1);
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int pxy_log_content_inbuf(pxy_conn_ctx_t *, struct evbuffer *, int) NONNULL(1);
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int pxy_log_content_buf(pxy_conn_ctx_t *, unsigned char *, size_t, int) NONNULL(1);
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void pxy_log_connect_nonhttp(pxy_conn_ctx_t *) NONNULL(1);
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void pxy_log_dbg_evbuf_info(pxy_conn_ctx_t *, pxy_conn_desc_t *, pxy_conn_desc_t *) NONNULL(1,2,3);
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unsigned char *pxy_malloc_packet(size_t, pxy_conn_ctx_t *) MALLOC NONNULL(2);
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int pxy_set_dstaddr(pxy_conn_ctx_t *) NONNULL(1);
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void pxy_insert_sslproxy_header(pxy_conn_ctx_t *, unsigned char *, size_t *) NONNULL(1,2,3);
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void pxy_try_remove_sslproxy_header(pxy_conn_child_ctx_t *, unsigned char *, size_t *) NONNULL(1,2,3);
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void pxy_try_set_watermark(struct bufferevent *, pxy_conn_ctx_t *, struct bufferevent *) NONNULL(1,2,3);
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void pxy_try_unset_watermark(struct bufferevent *, pxy_conn_ctx_t *, pxy_conn_desc_t *) NONNULL(1,2,3);
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int pxy_try_close_conn_end(pxy_conn_desc_t *, pxy_conn_ctx_t *) NONNULL(1,2);
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void pxy_try_disconnect(pxy_conn_ctx_t *, pxy_conn_desc_t *, pxy_conn_desc_t *, int) NONNULL(1,2,3);
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void pxy_try_disconnect_child(pxy_conn_child_ctx_t *, pxy_conn_desc_t *, pxy_conn_desc_t *) NONNULL(1,2,3);
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int pxy_try_consume_last_input(struct bufferevent *, pxy_conn_ctx_t *) NONNULL(1,2);
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int pxy_try_consume_last_input_child(struct bufferevent *, pxy_conn_child_ctx_t *) NONNULL(1,2);
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void pxy_discard_inbuf(struct bufferevent *) NONNULL(1);
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void pxy_conn_ctx_free(pxy_conn_ctx_t *, int) NONNULL(1);
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void pxy_conn_free(pxy_conn_ctx_t *, int) NONNULL(1);
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void pxy_conn_term(pxy_conn_ctx_t *, int) NONNULL(1);
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void pxy_conn_term_child(pxy_conn_child_ctx_t *) NONNULL(1);
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void pxy_conn_free_children(pxy_conn_ctx_t *) NONNULL(1);
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int pxy_connect_srvdst(struct bufferevent *, pxy_conn_ctx_t *) NONNULL(1,2);
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int pxy_setup_child_listener(pxy_conn_ctx_t *) NONNULL(1);
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int pxy_bev_readcb_preexec_logging_and_stats(struct bufferevent *, pxy_conn_ctx_t *) NONNULL(1,2);
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int pxy_bev_eventcb_postexec_logging_and_stats(struct bufferevent *, short , pxy_conn_ctx_t *) NONNULL(1,3);
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void pxy_bev_readcb(struct bufferevent *, void *);
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void pxy_bev_writecb(struct bufferevent *, void *);
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void pxy_bev_eventcb(struct bufferevent *, short, void *);
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int pxy_bev_readcb_preexec_logging_and_stats_child(struct bufferevent *, pxy_conn_child_ctx_t *) NONNULL(1,2);
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void pxy_bev_eventcb_postexec_stats_child(short, pxy_conn_child_ctx_t *) NONNULL(2);
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void pxy_bev_readcb_child(struct bufferevent *, void *);
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void pxy_bev_writecb_child(struct bufferevent *, void *);
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void pxy_bev_eventcb_child(struct bufferevent *, short, void *);
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void pxy_conn_connect(pxy_conn_ctx_t *) NONNULL(1);
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void pxy_fd_readcb(evutil_socket_t, short, void *);
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void pxy_conn_setup(evutil_socket_t, struct sockaddr *, int,
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pxy_thrmgr_ctx_t *, proxyspec_t *, opts_t *,
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evutil_socket_t)
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NONNULL(2,4,5,6);
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#endif /* !PXYCONN_H */
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/* vim: set noet ft=c: */
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