ykpamcfg(1)						      General Commands Manual						       ykpamcfg(1)

NAME

       ykpamcfg - Manage user settings for the Yubico PAM module.

SYNOPSIS

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

OPTIONS

       -1     use slot 1.  This is the default.

       -2     use slot 2.

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

       -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 authentica-
	      tion.  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 <http://code.google.com/p/yubico-pam/issues/list>

SEE ALSO

       The yubico-pam home page <http://code.google.com/p/yubico-pam/>

       YubiKeys can be obtained from Yubico <http://www.yubico.com/>.

yubico-pam							    March 2011							       ykpamcfg(1)