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PAMOTPW(8) System Manager's Manual PAMOTPW(8) NAME pam_otpw - verify one-time passwords SYNOPSIS pam_otpw [ arguments ] DESCRIPTION OTPW is a one-time password authentication system. It compares entered passwords with hash values stored in the user's home directory in the file ~/.otpw. Once a password was entered correctly, its hash value in ~/.otpw will be overwritten with hyphens, which disables its use in fu- ture authentication. A lock file ~/.otpw.lock prevents that the same password challenge is issued on several concurrent authentication ses- sions. This helps to prevent an eavesdropper from copying a one-time password as it is entered instantly into a second session, in the hope to get access by sending the final newline character faster than the user could. Both an authentication management and a session management function are offered by this module. The authentication function asks for and veri- fies one-time passwords. The session function prints a message after login that reminds the user of the remaining number of one-time pass- words. ARGUMENTS debug Turn on debugging via syslog(3). nolock Disable locking. This option tells the authentication function of pam_otpw.so to ignore any existing ~/.otpw.lock lock file and not to generate any. With this option, pam_otpw.so will never ask for several passwords simultaneously. PSEUDO-USER INSTALLATION If a system pseudo user otpw exists in the user database (with UID < 1000), then the password hash files will not be stored in the user's home directory. Instead of looking for ~john/.otpw.lock the file has to be located in the home directory of the pseudo user otpw, and be named after the user (e.g. /var/lib/otpw/john). It will be accessed with the effective UID and GID of that pseudo user. AUTHOR The OTPW package, which includes the otpw-gen progam, has been devel- oped by Markus Kuhn. The most recent version is available from <http://www.cl.cam.ac.uk/~mgk25/otpw.html>. SEE ALSO otpw-gen(1), pam(8) 2014-08-07 PAMOTPW(8)
NAME | SYNOPSIS | DESCRIPTION | ARGUMENTS | PSEUDO-USER INSTALLATION | AUTHOR | SEE ALSO
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