NAME

       ykpamcfg - Manage user settings for the Yubico PAM module.

SYNOPSIS

       ykpamcfg [-1 | -2] [-A] [-p] [-i] [-v] [-h]

OPTIONS

       -1     use slot 1.  This is the default.

       -2     use slot 2.

       -A action
              choose action to perform. See ACTIONS below.

       -p path
              specify output file for, default is ~/.yubico/challenge

       -i iterations
              number of iterations to use for pbkdf2 of expected response

       -v     enable verbose mode.

ACTIONS

       add_hmac_chalresp
              The  PAM module can utilize the HMAC-SHA1 Challenge-Response mode found in YubiKeys
              starting with version 2.2 for offline  authentication.   This  action  creates  the
              initial state information with the C/R to be issued at the next logon.

              The utility currently outputs the state information to a file in the current user's
              home directory (~/.yubico/challenge-123456 for a YubiKey  with  serial  number  API
              readout enabled, and ~/.yubico/challenge for one without).

              The  PAM module supports a system wide directory for these state files (in case the
              user's home directories are  encrypted),  but  in  a  system  wide  directory,  the
              'challenge'    part   should   be   replaced   with   the   username.   Example   :
              /var/yubico/challenges/alice-123456.

              To use the system-wide mode, you currently have to move the generated  state  files
              manually and configure the PAM module accordingly.

EXAMPLE

       First, program a YubiKey for challenge response on Slot 2 :

              $ ykpersonalize -2 -ochal-resp -ochal-hmac -ohmac-lt64 -oserial-api-visible
               ...
              Commit? (y/n) [n]: y
              $

       Now, set the current user to require this YubiKey for logon :

              $ ykpamcfg -2 -v
               ...
              Stored initial challenge and expected response in '/home/alice/.yubico/challenge-123456'.
              $

       Then, configure authentication with PAM for example like this (make a backup first) :

       /etc/pam.d/common-auth (from Ubuntu 10.10) :

              auth required  pam_unix.so nullok_secure try_first_pass
              auth [success=1 new_authtok_reqd=ok ignore=ignore default=die]   pam_yubico.so mode=challenge-response
              auth requisite pam_deny.so
              auth required  pam_permit.so
              auth optional  pam_ecryptfs.so unwrap

BUGS

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

SEE ALSO

       The yubico-pam home page ⟨http://opensource.yubico.com/yubico-pam/⟩

       YubiKeys can be obtained from Yubico ⟨http://www.yubico.com/⟩.