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https://github.com/ggrandes/bouncer

Bouncer is a network TCP port redirector/forward proxy (like rinetd) with extra features like Reverse tunneling (like ssh -R), SSL tunneling (like stunnel), connection Failover, LoadBalancing and Clustering. In pure Java (BIO)
https://github.com/ggrandes/bouncer

aes bouncer encryption java mux reverse-tunnels ssl tcp tunnel

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Bouncer is a network TCP port redirector/forward proxy (like rinetd) with extra features like Reverse tunneling (like ssh -R), SSL tunneling (like stunnel), connection Failover, LoadBalancing and Clustering. In pure Java (BIO)

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README 

        
# Bouncer (TCP)



Bouncer is an open source (Apache License, Version 2.0) Java network proxy. Do not require any external lib.



### Current Stable Version is [2.2.11](https://maven-release.s3.amazonaws.com/release/org/javastack/bouncer/2.2.11/bouncer-2.2.11-bin.zip)



---



## DOC



#### Schema about Forward / Port Redirector (you need ONE bouncer):

    

![Forward / Port Redirector](https://raw.github.com/ggrandes/bouncer/master/doc/forward_port.png "Forward / Port Redirector")



1. Machine-A (Client) init connection to Machine-B (Bouncer)

2. Machine-B init connection to Machine-C (Server)

3. Done: Machine-A is able to speak with Machine-C



###### Notes about security:



* Machine-A (Client) may be in Internal network.

* Machine-B (Bouncer) may be in DMZ.

* Machine-C (Server) may be in External network.



#### Schema about Reverse Tunneling (you need TWO bouncers):

    

![Reverse Tunneling](https://raw.github.com/ggrandes/bouncer/master/doc/reverse_tunneling.png "Reverse Tunneling")



###### Machine-A and Machine-B are Bouncers in Client-Server configuration.



1. Machine-A (MUX-OUT) init connection to Machine-B (MUX-IN)

2. Machine-D (Client) init connection to Machine-B

3. Machine-B request to Machine-A new SubChannel over MUX (Tunnel).

4. Machine-A open connection to Machine-C (Server).

5. Done: Machine-D is able to speak with Machine-C



###### Notes about security:



* Machine-B (MUX-IN) should be in DMZ.

* Machine-A (MUX-OUT) and Machine-C (Server) may be in internal network.



---



## System Properties (optional)



    # To redir stdout/stderr to (auto-daily-rotated) files you can use:

    -Dlog.stdOutFile=/var/log/bouncer.out -Dlog.stdErrFile=/var/log/bouncer.err

    # To log to stdout too:

    -Dlog.stdToo=true 



###### Filenames are a base-pattern, output files they will be: bouncer.xxx.YEAR-MONTH-DAY (bouncer.xxx.2014-12-01)



## Config (bouncer.conf)

Config file must be in class-path `${BOUNCER_HOME}/conf/`, general format is:



    # Forward / Port Redirector

    #     [opts]

    

    # Reverse Tunneling (Bouncer 2.x syntax)

    #     [opts]

    #     [opts]

    

    # Note:  can be a coma separated list of addresses, like "srv1,srv2,192.168.1.1"

    

    # Clustering Config

    #     [opts]

    #     [opts]



###### Options are comma separated:



* Options for outgoing connections

    * Loadbalancing/Failover (only one option can be used)

        * **LB=ORDER**: active failover-only in order (DNS resolved IP address are sorted, lower first)

        * **LB=RR**: active LoadBalancing in DNS order (round-robin)

        * **LB=RAND**: activate LoadBalancing in DNS random order

    * Sticky Session

        * **STICKY=MEM:bitmask:elements:ttl[:cluster-id:replication-id]**: activate Sticky session based on IP Source Address. Sessions are stored in MEMory, *bitmask* is a [CIDR](http://en.wikipedia.org/wiki/CIDR) to apply in source-ip-address (16=Class B, 24=Class C, 32=Unique host), *elements* for LRU cache, *ttl* is time to live of elements in cache (seconds), *cluster-id* and *replication-id* in cluster environment is cluster identifier and replication identifier respectively. 

* Options for inbound connections

    * **PROXY=SEND**: use PROXY protocol (v1), generate header for remote server

* Options for Forward / Port Redirector (rinetd)

    * **TUN=SSL**: activate SSL/TLS tunneling outbound (destination is SSL/TLS, like stunnel)

        * **SSL=client.crt:client.key[:server.crt]**: specify files for SSL/TLS config (client mode) (optional)

    * **TUN=ENDSSL**: activate SSL/TLS tunneling inbound (origin is SSL/TLS, like stunnel)

        * **ENDSSL=server.crt:server.key[:client.crt]**: specify files for SSL/TLS config (server mode)

* Options for Reverse Tunneling (MUX)

    * **TUN_ID=number**: When use Bouncer 2.x syntax you can create multiple Tunnels over same mux, use this ID for associate both ends.

    * Select operation of MUX (only one option can be used) in Bouncer 1.x config

        * **MUX=IN**: activate input-terminator multiplexor (Bouncer 2.x syntax: `mux-in, tun-listen`)

        * **MUX=OUT**: activate output-initiator multiplexor (Bouncer 2.x syntax: `mux-out, tun-connect`)

    * Options for encryption (optional -AES or SSL or NONE-):

        * **MUX=AES**: activate AES encryption in multiplexor (see AES=sharedsecret)

            * **AES=sharedsecret**: specify the password for AES (no white spaces, no comma sign, no equals sign)

            * **AESBITS=bits** (optional): specify the keysize for AES (default: `128`)

            * **AESALG=algorithm** (optional): specify the transformation for AES (default: `AES/CTR/NoPadding`)

        * **MUX=SSL**: activate SSL/TLS encryption in multiplexor (see SSL=xxx)

            * **SSL=server.crt:server.key:client.crt**: specify files for SSL/TLS config (server/mux-in)

            * **SSL=client.crt:client.key:server.crt**: specify files for SSL/TLS config (client/mux-out)

* Options for Clustering (TCP only)

    * Options for encryption (optional -AES or SSL or NONE-):

        * **CLUSTER=AES**: activate AES encryption in cluster (see AES=sharedsecret)

            * **AES=sharedsecret**: specify the password for AES (no white spaces, no comma sign, no equals sign)

            * **AESBITS=bits** (optional): specify the keysize for AES (default: `128`)

            * **AESALG=algorithm** (optional): specify the transformation for AES (default: `AES/CTR/NoPadding`)

        * **CLUSTER=SSL**: activate SSL/TLS encryption in cluster (see SSL=xxx)

            * **SSL=server.crt:server.key:client.crt**: specify files for SSL/TLS config (server/cluster-in)

            * **SSL=client.crt:client.key:server.crt**: specify files for SSL/TLS config (client/cluster-out)



###### Notes about LB policies:



* **LB=ORDER**: ordering of \ is preserved, but DNS resolved records are sorted numerically before create address list, Example config: srv3,srv2,10.1.1.1 (DNS query return {10.1.3.7,10.1.3.8} for srv3 and {10.1.2.**9**,10.1.2.**3**} for srv2), the resulting Address list will be: {10.1.3.7,10.1.3.8,10.1.2.**3**,10.1.2.**9**,10.1.1.1}. All connections will be always for 10.1.3.7, if down, 10.1.3.8, and so on. If Sticky is enabled this have preference over address order (no failback). 

* **LB=RR**: ordering of \ is preserved, and DNS resolved records are not sorted numerically before create address list, Example config: srv3,srv2,10.1.1.1 (DNS query return {10.1.3.7,10.1.3.8} for srv3 and {10.1.2.9,10.1.2.3} for srv2), the resulting Address list will be: {10.1.3.7,10.1.3.8,10.1.2.9,10.1.2.3,10.1.1.1}. The connections are rotative over all addresses for all clients, 10.1.3.7,10.1.3.8,...,10.1.1.1,and again 10.1.3.7,... if an address is down, picks next, and so on.... until a full turn. 

* **LB=RAND**: ordering of \ is not preserved, and DNS resolved records are not sorted numerically before create address list, instead, all addreses are agregated and shuffled on every connection, Example config: srv3,srv2,10.1.1.1 (DNS query return {10.1.3.7,10.1.3.8} for srv3 and {10.1.2.9,10.1.2.3} for srv2), the resulting Address list can be: {10.1.3.8,10.1.1.1,10.1.3.7,10.1.2.9,10.1.2.3}. The connection first try 10.1.3.8, if down, 10.1.1.1, and so on.... until 10.1.2.3. 



###### Notes about security:



* If use MUX=SSL or CLUSTER=SSL

    * Keys/Certificates are pairs, must be configured in the two ends (MUX-IN & MUX-OUT)

    * files.crt are X.509 public certificates

    * files.key are RSA Keys in PKCS#8 format (no encrypted)

    * files.crt/.key must be in class-path `${BOUNCER_HOME}/keys/`

    * be careful about permissions of "files.key" (unix permission 600 may be good)

* If use MUX=AES or CLUSTER=AES, you need to protect the "bouncer.conf" from indiscrete eyes (unix permission 600 may be good)



##### Example config of Forward / Port Redirector (rinetd style):



    #     [opts]

    0.0.0.0 1234 127.1.2.3 9876

    127.0.0.1 5678 encrypted.google.com 443 LB=RR,STICKY=MEM:24:128:300,TUN=SSL

    127.0.0.1 8443 encrypted.google.com 443 TUN=ENDSSL,ENDSSL=server.crt:server.key,TUN=SSL



##### Example config of Reverse Tunnels (equivalent ssh -p 5555 192.168.2.1 -R 127.0.0.1:8080:192.168.1.1:80)



###### Machine-A (MUX-OUT):



    ### Bouncer 1.x legacy syntax ###

    #     MUX-OUT

    192.168.1.1 80 192.168.2.1 5555 MUX=OUT

    

    ### Bouncer 2.x syntax, with support for multi-port ###

    #     [opts]

    mux-out mux1 127.0.0.1 5555

    tun-connect mux1 192.168.2.1 80 TUN_ID=1

    tun-connect mux1 192.168.2.1 22 TUN_ID=2



###### Machine-B (MUX-IN):

 

    ### Bouncer 1.x legacy syntax ###

    #     MUX-IN

    192.168.2.1 5555 127.0.0.1 8080 MUX=IN



    ### Bouncer 2.x syntax, with support for multi-port ###

    #     [opts]

    mux-in mux1 192.168.2.1 5555

    tun-listen mux1 127.0.0.1 8080 TUN_ID=1

    tun-listen mux1 127.0.0.1 2222 TUN_ID=2

 

##### Same example config of Reverse tunnels but SSL/TLS



###### Machine-A (MUX-OUT):



    ### Bouncer 1.x legacy syntax ###

    #     MUX-OUT

    192.168.1.1 80 192.168.2.1 5555 MUX=OUT,MUX=SSL,SSL=peerA.crt:peerA.key:peerB.crt

    

    ### Bouncer 2.x syntax, with support for multi-port ###

    #     [opts]

    mux-out mux1 127.0.0.1 5555 MUX=SSL,SSL=peerA.crt:peerA.key:peerB.crt

    tun-connect mux1 192.168.2.1 80 TUN_ID=1

    tun-connect mux1 192.168.2.1 22 TUN_ID=2

    tun-connect mux1 192.168.2.1 25 TUN_ID=3



###### Machine-B (MUX-IN):

 

    ### Bouncer 1.x legacy syntax ###

    #     MUX-IN

    192.168.2.1 5555 127.0.0.1 8080 MUX=IN,MUX=SSL,SSL=peerB.crt:peerB.key:peerA.crt



    ### Bouncer 2.x syntax, with support for multi-port ###

    #     [opts]

    mux-in mux1 192.168.2.1 5555 MUX=SSL,SSL=peerB.crt:peerB.key:peerA.crt

    tun-listen mux1 127.0.0.1 8080 TUN_ID=1

    tun-listen mux1 127.0.0.1 2222 TUN_ID=2

    tun-listen mux1 127.0.0.1 465 TUN_ID=3,TUN=ENDSSL,ENDSSL=server.crt:server.key



###### For Encryption Tunnels with AES (no SSL/TLS) you can use `MUX=AES,AES=sharedsecret` in both sides 



* More examples in [sampleconf](https://github.com/ggrandes/bouncer/blob/master/sampleconf/)



---



## Running (Linux)



    ./bin/bouncer.sh 



## Running (command line without config file)



    java -jar bouncer-x.x.x.jar -- "...config.line.1..." "...config.line.2..."

    

    Example:

    java -jar bouncer-x.x.x.jar -- "0.0.0.0 1234 127.1.2.3 9876" "127.0.0.1 5678 encrypted.google.com 443 TUN=SSL"



## Running (command line with remote config file)



    java -jar bouncer-x.x.x.jar https://config.acme.com/bouncer.conf

    



## RSA Key / X.509 Certificate Generation for MUX-SSL (optional)



    ./bin/bouncer.sh keygen    



## Enabling Strong Ciphers with BouncyCastleProvider



You can improve security, simply download **bcprov-jdk15on-`XXX`.jar** from [BouncyCastle](http://www.bouncycastle.org/latest_releases.html) and copy jar file to `${BOUNCER_HOME}/lib/` 



---



## TODOs



* NIO? - for [C10K problem](https://en.wikipedia.org/wiki/C10k_problem), in forward mode, try [jrinetd](https://github.com/ggrandes/jrinetd)

* Use Log4J

* Limit number of connections

* Limit absolute timeout/TTL of a connection

* Configurable retry-sleeps



## DONEs



* Reload config (v1.1)

* Thread pool/control (v1.2)

* Reverse tunnels (like ssh -R) over MUX (multiplexed channels) (v1.2)

* FlowControl in MUX (v1.3)

* Custom timeout by binding (v1.4)

* Encryption MUX/Tunnel (AES+PreSharedSecret) (v1.4)

* Encryption MUX/Tunnel (SSL/TLS) (v1.5)

* Key Generator for MUX-SSL/TLS (v1.5)

* Audit threads / connections (v1.5)

* Improved FlowControl in MUX (v1.5)

* Allow redir stdout/stderr to File, with auto daily-rotate (v1.5.1)

* Enable TLSv1.2 ciphers (v1.5.8)

* Added Elliptic Curve Diffie-Hellman Ephemeral Cipher Suites (v1.5.9)

* Zip Packaging (Maven Assembly) (v1.5.9)

* Allow AutoRegister JCE BouncyCastleProvider (v1.5.9)

* Configurable [CipherSuites](https://docs.oracle.com/javase/7/docs/technotes/guides/security/SunProviders.html#SunJSSEProvider) for SSL/TLS (v1.6.0)

    * For AES-256 you need [JCE Unlimited Strength](http://www.oracle.com/technetwork/es/java/javase/downloads/jce-7-download-432124.html) 

* Allow different tunnels over same MUX(IN/OUT) (v2.0.1)

* BufferPool for reduce GC pressure (v2.0.1)

* PROXY protocol (v1) for Outgoing connections (v2.1.0)

* Sticky sessions in LoadBalancing (v2.2.1)

* Statistics/Accounting (v2.2.2)

* JMX (v2.2.3)

* Multiple remote-addr (not only multi DNS A-record) (v2.2.4)

* Replicate Sticky Sessions over multiple Bouncers (HA) (v2.2.5)

* Allow alternative config names (v2.2.6)

* Support for End SSL (v2.2.8)

* Support client authentication in TUN=SSL (v2.2.8)

* Support basic command line config without file (scripts,containers,etc) (v2.2.9)

* Support remote config file (http/https) (v2.2.9)



## MISC

Current harcoded values:



* Buffer Pool size: 4 (per thread)

* Buffer length for I/O: 4096bytes

* IO-Buffers: 8

* TCP `SO_SNDBUF`/`SO_RCVBUF`: BufferLength * IO-Buffers 

* Connection timeout: 30seconds

* DNS cache: 2seconds

* Read timeout: 5minutes

* MUX Keep-Alive: 30seconds

* MUX-IN Error retry sleep: 0.5/1seconds

* MUX-OUT Error retry sleep: 5seconds

* Reload config check time interval: 10seconds

* For MUX-AES [Password-Based Key Derivation Function](https://docs.oracle.com/javase/7/docs/technotes/guides/security/SunProviders.html#SunJCEProvider) for 4 keys (2 for Cipher, 2 for Mac) is PBKDF2WithHmacSHA1

* For MUX-AES default [Cipher](https://docs.oracle.com/javase/7/docs/technotes/guides/security/SunProviders.html#SunJCEProvider) is AES/CTR/NoPadding (128 bits)

* For MUX-AES [Mac](https://docs.oracle.com/javase/7/docs/technotes/guides/security/SunProviders.html#SunJCEProvider) for Authenticated encryption (Encrypt-then-MAC) is HmacSHA256

* For MUX-AES Randomized IV per-message is used. 

* For MUX-AES Rekey is done every 32768 messages (2^15).

* For MUX-AES Anti-replay window for messages (time): 5minutes

* For MUX-AES Anti-replay sequence for messages: 31bits

* For MUX-SSL supported Asymmetric Keys are RSA

* For MUX-SSL enabled [Protocols](https://docs.oracle.com/javase/7/docs/technotes/guides/security/SunProviders.html#SunJSSEProvider) are:

    * `TLSv1.2`

    * `TLSv1.1`

    * `TLSv1`

    * `SSLv3` DISABLED [POODLE CVE-2014-3566](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-3566)

* Shutdown/Reload timeout: 30seconds

* Statistics print interval: 30seconds



---



## Latency Benchmark



  

    microsecs

    Direct

    Forward

    MUX

    MUX-AES

    MUX-SSL

  

  

    min

    12

    38

    110

    125

    184

  

  

    max

    1468

    1016

    1351

    51036

    21771

  

  

    avg

    19

    46

    120

    153

    213

  



## Throughput Benchmark



  

    (transfers)

    Direct (x2)

    Forward (x4)

    MUX (x6)

    MUX-AES (x6)

    MUX-SSL (x6)

  

  

    Mbytes

    256

    128

    51

    17

    19

  

  

    Mbits

    2048

    1024

    408

    136

    152

  



###### All test run on localhost on a Laptop. Values are not accurate, but orientative. Latency { EchoServer, 1 byte write/read (end-to-end, round-trip), 100K iterations } Lower Better. Throughput { Chargen, 1024bytes read & write (full-duplex), total 512MBytes } Higher better.



---

Inspired in [rinetd](http://www.boutell.com/rinetd/), [stunnel](https://www.stunnel.org/static/stunnel.html) and [openssh](http://www.openssh.org/), this bouncer is Java-minimalistic version.