Mix Installation (FreeBSD Jail)

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JonDos GmbH thanks www.secure-internet.org for the right to publish the following article. We made some changes in it but the original text was provided www.secure-internet.org

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HowTo install the mix server software for FreeBSD/Jail

This HowTo describes the installation of the mix server and related software for FreeBSD using Jails. We prefer the installation of related software from ports (not packages), because compilation does not take much time and ports are sometimes more up to date than packages. The software for mix servers for FreeBSD is distributed as source code.


To compile the mix sources the libraries OpenSSL (at least v.0.9.7) and Xerces-C++ are required. Additionally a C++ compiler, automake and subversion are required, too. It may be useful to install subversion from ports, to disable BDB.

cd /usr/ports/security/openssl && make install clean
cd /usr/ports/textproc/xerces-c2-devel && make install clean
cd /usr/ports/devel/automake19 && make install clean
cd /usr/ports/devel/subversion && make install WITHOUT_BDB=YES && make clean

For premium mixes PostgreSQL database server, client and C-libraries for PostgreSQL clients are required, too.

cd /usr/ports/databases/postgresql84-client && make install clean
cd /usr/ports/databases/postgresql84-server && make install clean
cd /usr/ports/databases/postgresql-libpq++ && make install clean  

Compile the source code

Checkout the latest stable version from our subversion repository. We recommend the use of the directory /home/mix for sources.

mkdir /home/mix
cd /home/mix
svn checkout https://svn.jondos.de/svn/proxytest/proxytest/branches/stable

Afterwards compile and install the mix software:

cd /home/mix/stable
./configure --enable-new-channel-encryption --enable-new-flow-control
make install

Enable additional features

Depending on the features needed by your mix, you can enable some more features for your mix:

 ./configure --enable-new-channel-encryption --enable-new-flow-control --enable-payment .... ....

Mandatory feature for premium services:

  • --enable-payment Specifies to build with payment support.

Monitoring your mix:

  • --enable-server_monitoring Specifies to build with state tracking for server monitoring. You can specify a monitor port in the mix configuration (usually port 8080) and fetch a XML file from this IP:port time by time to check your mix. A plug-in for Nagios, which is using the monitoring port, will be found in the mix source tree misc/nagios.

Additional Logging features:

  • --enable-crime-detection Enable crime detection mode. Crime detection parameters can be specified in the mix configuration file. Do ONLY use it, if you are under constraint by authorities and law. For working properly, all mixes of a cascade have to enable this feature.
  • --enable-dataretentionlog Enable log messages according to data retention law.

Other features:

  • --enable-bandwidth-limitation Specifies to build with last mix bandwidth limitation. The limitation parameters can be specified in the mix configuration file. (only exit mixes)

Create a system user account

It is not a good solution to run the mix server with root privileges. Create a new system user account (recommended name: mix) and specify this user account in the mix configuration file. After startup, the mix server will switch to this UID.

Create a system user account with useradd:

adduser --quiet --system --disabled-password --shell=/bin/false --group mix

Create a log directory

The directory and file for log messages will be specified in the mix configuration file. You have to create the directory and set safe permissions:

mkdir /var/log/mix
chown mix:adm /var/log/mix
chmod 0750 /var/log/mix

No logrotate configuration is necessary. The mix server creates a new file, if the log file size exceeded the configured limit.

Start the mix server

You have to create a mix configuration, become root, raise the number of max. open descriptors to the value specified in the mix configuration file and you can start the mix.

For Csh (FreeBSD default) use:

limit descriptors 32768
mix -c /path/to/config.xml

If Bash is installed and preferred, use:

ulimit -HSn 32768
mix -c /path/to/config.xml

After startup the mix server will switch to the sytem UID specified in the mix configuration file.

Update the mix software

Like other software the mix is updated time by time. New features will be added, bugs will be fixed ... and so on. Join the operator mailing list to stay up-to-date about software updates. If an update is announced, run the following steps.

cd /home/mix/stable
make distclean
svn update
./configure  --enable-new-channel-encryption --enable-new-flow-control --enable-server_monitoring --enable-payment .... ....
make install

After successful update restart the mix.

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