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About

This program is openconnect VPN server (ocserv), a server for the openconnect VPN client. It follows the openconnect protocol and is believed to be compatible with CISCO's AnyConnect SSL VPN.

The program consists of:

1. ocserv, the main server application
2. occtl, the server's control tool. A tool which allows one to query the server for information.
3. ocpasswd, a tool to administer simple password files.

Build dependencies

Required dependencies (Debian pkg/Fedora pkg):

libgnutls28-dev      / gnutls-devel
libev-dev            / libev-devel

Optional dependencies that enable specific functionality:

TCP wrappers: libwrap0-dev       / tcp_wrappers-devel
PAM:          libpam0g-dev       / pam-devel
LZ4:          liblz4-dev         / lz4-devel
seccomp:      libseccomp-dev     / libseccomp-devel
occtl:        libreadline-dev    / readline-devel
              libnl-route-3-dev  / libnl3-devel
GSSAPI:       libkrb5-dev        / krb5-devel
OATH:         liboath-dev        / liboath-devel
Radius:       libradcli-dev      / radcli-devel

Dependencies for development, testing, or dependencies that can be skipped in an embedded system (e.g., because a replacement library is included):

libprotobuf-c0-dev / protobuf-c-devel
libtalloc-dev      / libtalloc-devel
libhttp-parser-dev / http-parser-devel
libpcl1-dev        / pcllib-devel
libopts25-dev      / autogen-libopts-devel
autogen            / autogen
protobuf-c-compiler/ protobuf-c
gperf              / gperf
liblockfile-bin    / lockfile-progs
nuttcp             / nuttcp
lcov               / lcov
libuid-wrapper     / uid_wrapper
libpam-wrapper     / pam_wrapper
libnss-wrapper     / nss_wrapper
libsocket-wrapper  / socket_wrapper
gss-ntlmssp        / gssntlmssp
libpam-oath        / pam_oath

See README-radius for more information on Radius dependencies and its configuration.

Build instructions

To build from a distributed release use:

$ ./configure && make && make check

When cross compiling it may be useful to add the --enable-local-libopts option to configure.

To test the code coverage of the test suite use the following:

$ ./configure --enable-code-coverage
$ make && make check && make code-coverage-capture

Note that the code coverage reported does not currently include tests which are run within docker.

In addition to the prerequisites listed above, building from git requires the following packages: autoconf, automake, autogen, git2cl, and xz.

To build from the git repository use:

$ autoreconf -fvi
$ ./configure && make

Note that the system's autogen version must match the included libopts version on the development system, if the included libopts library is to be used.

Basic installation instructions

Now you need to generate a certificate. E.g.

$ certtool --generate-privkey > ./test-key.pem
$ certtool --generate-self-signed --load-privkey test-key.pem --outfile test-cert.pem

(make sure you enable encryption or signing)

To run the server on the foreground edit the sample.config and then run:

# cd doc && ../src/ocserv -f -c sample.config

Configuration

Several configuration instruction are available in the recipes repository.

Profiling

If you use ocserv on a server with significant load and you'd like to help improve it, you may help by sending profiling information. That includes the bottlenecks in software, so future optimizations could be spent on the real needs.

In a Linux system you can profile ocserv using the following command.

# perf record -g ocserv

After the server is terminated, the output is placed in perf.data. You may examine the output using:

# perf report

How the VPN works

Please see the technical description page.