openfortivpn is a client for PPP+SSL VPN tunnel services.
It spawns a pppd process and operates the communication between the gateway and this process.

It is compatible with Fortinet VPNs.

• Simply connect to a VPN:

  openfortivpn vpn-gateway:8443 --username=foo
  

• Connect to a VPN using an authentication realm:

  openfortivpn vpn-gateway:8443 --username=foo --realm=bar
  

• Don't set IP routes and don't add VPN nameservers to /etc/resolv.conf:

  openfortivpn vpn-gateway:8443 -u foo -p bar --no-routes --no-dns --pppd-no-peerdns
  

• Using a config file:

  openfortivpn -c /etc/openfortivpn/my-config
  

  With /etc/openfortivpn/my-config containing:

  host = vpn-gateway
  port = 8443
  username = foo
  password = bar
  set-routes = 0
  set-dns = 0
  pppd-use-peerdns = 0
  # X509 certificate sha256 sum, trust only this one!
  trusted-cert = e46d4aff08ba6914e64daa85bc6112a422fa7ce16631bff0b592a28556f993db
  

Some Linux distibutions provide openfortivpn packages:

• Fedora
• openSUSE / SLE
• Gentoo
• NixOS
• Arch Linux
• Debian (testing)
• Solus

On macOS both Homebrew and MacPorts provide an openfortivpn package. Either install Homebrew then install openfortivpn:

# Install 'Homebrew'
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

# Install 'openfortivpn'
brew install openfortivpn

or install MacPorts then install openfortivpn:

# Install 'openfortivpn'
sudo port install openfortivpn

For other distros, you'll need to build and install from source:

1. Install build dependencies.

   • RHEL/CentOS/Fedora: gcc automake autoconf openssl-devel pkg-config
   • Debian/Ubuntu: gcc automake autoconf libssl-dev pkg-config
   • Arch Linux: gcc automake autoconf openssl pkg-config
   • Gentoo Linux: net-dialup/ppp pkg-config
   • openSUSE: gcc automake autoconf libopenssl-devel pkg-config
   • macOS(Homebrew): automake autoconf openssl@1.0 pkg-config

   On Linux, if you manage your kernel yourself, ensure to compile those modules:

   CONFIG_PPP=m
   CONFIG_PPP_ASYNC=m
   

   On macOS, install 'Homebrew' to install the build dependencies:

   # Install 'Homebrew'
   /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
   
   # Install Dependencies
   brew install automake autoconf openssl@1.0 pkg-config
   
   # You may need to make this openssl available to compilers
   export LDFLAGS="-L/usr/local/opt/openssl/lib $LDFLAGS"
   export CPPFLAGS="-I/usr/local/opt/openssl/include $CPPFLAGS"

2. Build and install.

   ./autogen.sh
   ./configure --prefix=/usr/local --sysconfdir=/etc
   make
   sudo make install

   If you need to specify the openssl location you can set the $PKG_CONFIG_PATH environment variable.

openfortivpn needs elevated privileges at three steps during tunnel set up:

• when spawning a /usr/sbin/pppd process;
• when setting IP routes through VPN (when the tunnel is up);
• when adding nameservers to /etc/resolv.conf (when the tunnel is up).

For these reasons, you may need to use sudo openfortivpn.
If you need it to be usable by non-sudoer users, you might consider adding an entry in /etc/sudoers.

For example: visudo -f /etc/sudoers.d/openfortivpn

Cmnd_Alias  OPENFORTIVPN = /usr/bin/openfortivpn

%adm       ALL = (ALL) OPENFORTIVPN

Warning: Make sure only trusted users can run openfortivpn as root!
As described in #54, a malicious user could use --pppd-plugin and --pppd-log options to divert the program's behaviour.

Feel free to make pull requests!

C coding style should follow the Linux kernel Documentation/CodingStyle.