SYNOPSIS

pam_u2f [...]

DESCRIPTION

The module provides U2F authentication against Yubikeys and other compliant authenticators.

OPTIONS

debug

Turns on debugging to STDOUT

origin=origin

Set the origin for the U2F authentication procedure. If no value is specified, the origin "pam://$HOSTNAME" is used.

appid=appid

Set the application ID for the U2F authentication procedure. If no value is specified, the same value used for origin is taken ("pam://$HOSTNAME" if also origin is not specified).

authfile=file

Set the location of the file that holds the mappings of user names to keyHandles and user keys. The format is username:keyHandle1,public_key1:keyHandle2,public_key2:... the default location of the file is $XDG_CONFIG_HOME/Yubico/u2f_keys. If the environment variable is not set, $HOME/.config/Yubico/u2f_keys is used.

nouserok

Set to enable authentication attempts to succeed even if the user trying to authenticate is not found inside authfile.

alwaysok

Set to enable all authentication attempts to succeed (aka presentation mode).

max_devices=n_devices

Maximum number of devices allowed per user (default is 24). Devices specified in the authentication file that exceed this value will be ignored.

interactive

Set to prompt a message and wait before testing the presence of a U2F device. Recommended if your device doesn't have tactile trigger.

manual

Set to drop to a manual console where challenges are printed on screen and response read from standard input. Useful for debugging and SSH sessions without U2F-support from the SSH client/server. If enabled, interactive mode becomes redundant and has no effect.

cue

Set to prompt a message to remind to touch the device.

EXAMPLES

auth sufficient pam_u2f.so debug origin=pam://$HOSTNAME appid=pam://$HOSTNAME

auth required pam_u2f.so origin=http://example.com appid=http://example.com authfile=/etc/yubikey_mappings