sio2jail

Building in Docker

Available commands:

• make release-docker - build sio2jail binary and .deb package.

• make install-docker - build sio2jail binary.

• make deb-docker - build sio2jail .deb package.

• make clean-docker - clean up all temporary files.

The output files are placed in ./out/ directory.

For further reference and configuration see ./Makefile.

Building manually

You need a CMake, a C/C++ compiler with multilib support and python2. Any external libraries that sio2jail uses (see below) can be either installed system-wide, or downloaded and built during the process. To build sio2jail and install files to ~/local directory run:

mkdir build && cd build

cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$HOME/local ..
make && make install

For building with default configuration, see scripts in ./Makefile.

Our sio2jail uses some external libraries and programs:

• libcap
• libseccomp (>= 2.3.0)
• libtclap
• scdoc (for generating man pages)
• g++-multilib

some of which you can install (e.g. on Debian) with:

apt-get install libcap-dev libtclap-dev libseccomp-dev g++-multilib

By default sio2jail searches for this libraries in system paths and in case they aren't found their sources are downloaded and libraries are built in working directory. You can tune this behaviour with cmake options:

-D<DEPENDENCY>_PREFIX=<PATH>
-D<DEPENDENCY>_BUILD_OWN=YES|NO

where DEPENDENCY is one of

• LIBCAP
• LIBSECCOMP
• LIBTCLAP
• SCDOC

You can also control whether to generate man pages with option (YES by default):

-DWITH_DOCS=YES|NO

and whether to install boxes scripts (NO by default):

-DWITH_BOXES=YES|NO

To control whether sio2jail binary is statically or dynamically linked use option (STATIC by default):

-DLINK=STATIC|DYNAMIC

There is also a possibility to control whether output binary should run on other architecture than the default one (or force given architecture):

-DARCH=i386|amd64

Note, that when using ARCH other than build host architecture it may be necessary (depending on libraries installation) to build sio2jail with custom libseccomp (more precisely with flag -DLIBSECCOMP_BUILD_OWN=YES).

For example, to skip man pages, use libtclap from /opt/tclap directory and ignore system libseccomp run:

cmake -DWITH_DOCS=NO -DLIBTCLAP_PREFIX=/opt/tclap -DLIBSECCOMP_BUILD_OWN=YES ..

Running

You may need to run

sysctl -w kernel.perf_event_paranoid=-1

Additionally, if you want to use sandboxing on older Debian kernels, you'll need to run

sysctl -w kernel.unprivileged_userns_clone=1

For both settings, you may also put these options in your /etc/sysctl.conf. This will make the settings persist across reboots.

Running tests

To run test suit use 'check' target, e.g in build directory run:

make check

Notes for developers

To manually run clang-format on each file run:

make clang-format

inside build directory.

To manually run clang-tidy on each source file run:

make clang-tidy

or to use automatically fix errors:

make clang-tidy-fix

inside build directory.

There is possibility to enable running clang-tidy automatically during compilation on each file (can significantly slow down compilation):

-DWITH_CLANG_TIDY=YES