Ubuntu Manpage: pam_yubico - Module for YubiKey authentication

NAME

       pam_yubico - Module for YubiKey authentication

SYNOPSIS

       pam_yubico [...]

DESCRIPTION

       The module is for authentication of YubiKeys, either with online validation of OTP, or
       offline validation with HMAC-SHA1 challenge-response.

OPTIONS

debug
Turns on debugging to STDOUT

mode=[client|challenge-response]
Set the mode of operation, client for OTP validation and challenge-response for
challenge-response validation, client is the default.

authfile=file
Set the location of the file that holds the mappings of Yubikey token IDs to user
names. The format is username:first_public_id:second_public_id:... default location of
the file is $HOME/.yubico/authorized_yubikeys.

id=id
Set to your client identity.

key=key
Set to your client key in base64 format. The client key is also known as API key, and
provides integrity in the communication between the client (you) and the validation
server. If you want to get one for use with the default YubiCloud service, please go
to https://upgrade.yubico.com/getapikey/

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

try_first_pass
Before prompting the user for their password, the module first tries the previous
stacked module´s password in case that satisfies this module as well.

use_first_pass
The argument use_first_pass forces the module to use a previous stacked modules
password and will never prompt the user - if no password is available or the password
is not appropriate, the user will be denied access.

urllist=list
List of URL templates to be used. This is set by calling ykclient_set_url_bases. The
list should be in the format:
https://api1.example.com/wsapi/2.0/verify;https://api2.example.com/wsapi/2.0/verify

url=url
This option should not be used, please use the urllist option instead. Set the URL
template to use, this is set by calling ykclient_set_url_template. The URL should be
set in the format https://api.example.com/wsapi/2.0/verify?id=%d&otp=%s

capath=path
Specify the path where X509 certificates are stored. This is required if https or
ldaps are used in url and ldap_uri respectively.

verbose_otp
This argument is used to show the OTP (One Time Password) when it is entered, i.e. to
enable terminal echo of entered characters. You are advised to not use this, if you
are using two factor authentication because that will display your password on the
screen. This requires the service using the PAM module to display custom fields. For
example, OpenSSH requires you to configure "ChallengeResponseAuthentication no".

ldap_uri=uri
Specify the LDAP server URI (e.g. ldap://localhost).

ldap_server=server
Specify the LDAP server host (default LDAP port is used). Deprecated. Use ldap_uri
instead.

ldapdn=dn
The dn where the users are stored (eg: ou=users,dc=domain,dc=com). If ldap_filter is
used this is the base from which the subtree search will be performed.

user_attr=attr
The LDAP attribute used to store user names (eg:cn).

yubi_attr=attr
The LDAP attribute used to store the Yubikey id.

yubi_attr_prefix=prefix
The prefix of the LDAP attribute’s value, in case of a generic attribute, used to
store several types of ids.

token_id_length=length
Length of ID prefixing the OTP (this is 12 if using the YubiCloud).

ldap_bind_user=user
The user to attempt a LDAP bind as.

ldap_bind_password=password
The password to use on LDAP bind.

ldap_filter=filter
An ldap filter to use for attempting to find the correct object in LDAP. In this
string %u will be replaced with the username.

ldap_cacertfile=cacertfile
Ca certfile for the LDAP connection.

chalresp_path=path
Path of a system wide directory where challenge response files can be found for users.
Default location is $HOME/.yubico/

EXAMPLES

           auth sufficient pam_yubico.so id=16 debug

           auth required pam_yubico.so mode=challenge-response

           auth required pam_yubico.so id=16 ldap_uri=ldaps://ldap.example.com ldap_filter=(uid=%u) yubi_attr=yubiKeyId

FILES

       $HOME/.yubico/authorized_yubikeys
           If authfile is not set this file is used for the mapping between YubiKey public id and
           in client mode.

       $HOME/.yubico/challenge, $HOME/.yubico/challenge-serial_number
           If chalresp_path is not set these files are used to hold next challenge and expected
           response for the user in challenge-response mode. If chalresp_path is set the filename
           will be username instead of challenge.

BUGS

       Report yubico-pam bugs in the issue tracker: https://github.com/Yubico/yubico-pam/issues