openfortivpn man page

openfortivpn ā€” Client for PPP+SSL VPN tunnel services

Synopsis

openfortivpn [<host>:<port>] [-u <user>] [-p <pass>] [--realm=<realm>] [--set-routes=<bool>] [--no-routes] [--set-dns=<bool>] [--half-internet-routes=<bool>] [--no-dns] [--ca-file=<file>] [--user-cert=<file>] [--user-key=<file>] [--use-syslog] [--trusted-cert=<digest>] [--insecure-ssl] [--cipher-list=<ciphers>] [--pppd-no-peerdns] [--pppd-log=<file>] [--pppd-plugin=<file>] [--pppd-ipparam=<string>] [--pppd-ifname=<string>] [-c <file>] [-v|-q]
openfortivpn --help
openfortivpn --version

Description

openfortivpn connects to a VPN by setting up a tunnel to the gateway at <host>:<port>.

Options

--help

Show this help message and exit.

--version

Show version and exit.

-c <file>, --config=<file>

Specify a custom config file (default: /etc/openfortivpn/config).

-u <user>, --username=<user>

VPN account username.

-p <pass>, --password=<pass>

VPN account password.

--realm=<realm>

Connect to the specified authentication realm. Defaults to empty, which is usually what you want.

--set-routes=<bool>, --no-routes

Set if we should try to configure IP routes through the VPN when tunnel is up. If used multiple times, the last one takes priority.

--no-routes is the same as --set-routes=0.

--half-internet-routes=<bool>, if set to 1, tells openfortivpn not to

replace the default route by a different one, but set up two separate /1-routes instead.

--set-dns=<bool>, --no-dns

Set if we should add VPN nameservers in /etc/resolv.conf when tunnel is up. If used multiple times, the last one takes priority.

--no-dns is the same as --set-dns=0.

--ca-file=<file>

Use specified PEM-encoded certificate bundle instead of system-wide store to verify the gateway certificate.

--user-cert=<file>

Use specified PEM-encoded certificate if the server requires authentication with a certificate.

--user-key=<file>

Use specified PEM-encoded key if the server requires authentication with a certificate.

--use-syslog

Log to syslog instead of terminal.

--trusted-cert=<digest>

Trust a given gateway. If classical SSL certificate validation fails, the gateway certificate will be matched against this value. <digest> is the X509 certificate's sha256 sum. This option can be used multiple times to trust several certificates.

--insecure-ssl

Do not disable insecure SSL protocols/ciphers. If your server requires a specific cipher, consider using --cipher-list instead.

--cipher-list=<ciphers>

Openssl ciphers to use. If default does not work, you can try alternatives such as HIGH:!MD5:!RC4 or as suggested by the Cipher: line in the output of openssl(1) (e.g. AES256-GCM-SHA384):

$ openssl s_client -connect <host:port>

(default: HIGH:!aNULL:!kRSA:!PSK:!SRP:!MD5:!RC4)

--pppd-no-peerdns

Do not ask peer ppp server for DNS addresses and do not make pppd rewrite /etc/resolv.conf.

--pppd-log=<file>

Set pppd in debug mode and save its logs into <file>.

--pppd-plugin=<file>

Use specified pppd plugin instead of configuring the resolver and routes directly.

--pppd-ipparam=<string>

Provides an extra parameter to the ip-up, ip-pre-up and ip-down scripts. See man pppd(8) for further details

--pppd-ifname=<string>

Set the ppp interface name. Only if supported by pppd. Patched versions of pppd implement this option but may not be available on your platform.

-v

Increase verbosity. Can be used multiple times to be even more verbose.

-q

Decrease verbosity. Can be used multiple times to be even less verbose.

ENVIRONMENT and proxy support

openfortivpn can be run behind a http that supports the http connect command. It checks if one of the environment variables https_proxy HTTPS_PROXY all_proxy ALL_PROXY is set which are supposed to contain a string of the format
http://[host]:[port]
where [host] is the ip or the fully qualified host name of the proxy server [port] is the tcp port number where the proxy is listening for incoming connections. If one of these variables is defined, openfortivpn tries to first establish a tcp connection to this proxy (plain http, not encrypted), and then makes a request to connect to the vpn host as given on the command line or in the config file. The proxy is supposed to forward any subsequent packets transparently to the vpn host, so that the tls layer of the connection effectively is establshed between the client and the vpn host, and the proxy just acts as a forwarding instance on the lower level of the tcp connection.

The following environment variables are set by openfortivpn and pppd(8) or its scripts can obtain information this way:
VPN_GATEWAY the ip of the gateway host
and for each route three variables are set up, where an integer number is appended to the variable names, denoting the number of the current route:
VPN_ROUTE_DEST_... the destination network of the route
VPN_ROUTE_MASK_... the network mask for this route
VPN_ROUTE_GATEWAY_... the gateway for the current route entry

Config File

Options can be taken from a configuration file. Options passed in the command line will override those from the config file, though. The default config file is /etc/openfortivpn/config, but this can be set using the -c option. An empty template for the config file is installed to /usr/share/openfortivpn/config.template

A config file looks like:

# this is a comment
host = vpn-gateway
port = 8443
username = foo
password = bar
user-cert = /etc/openfortivpn/user-cert.pem
user-key = /etc/openfortivpn/user-key.pem
# the sha256 digest of the trusted host certs obtained by
# openssl dgst -sha256 server-cert.pem:
trusted-cert = certificatedigest4daa8c5fe6c...
trusted-cert = othercertificatedigest6631bf...
# This would specify a ca bundle instead of system-wide store
# ca-file = /etc/openfortivpn/ca-bundle.pem
set-dns = 1
set-routes = 1
half-internet-routes = 0
pppd-use-peerdns = 1
# aternatively, use a specific pppd plugin instead
# pppd-plugin = /usr/lib/pppd/default/some-plugin.so
# for debugging pppd write logs here
# pppd-log = /var/log/pppd.log
# pass an ipparam string to pppd
# pppd-ipparam = somestringtopasstopppd
insecure-ssl = 0
cipher-list = HIGH:!aNULL:!kRSA:!PSK:!SRP:!MD5:!RC4

Info

October 23, 2017