SYNOPSIS
ykmapcfg [-1 | -2] [-A] [-p] [-i] [-v] [-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.
-V
- display version and exit
-h
- display help and exit
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.
EXAMPLES
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