NAME
   Passwd::Keyring::PWSafe3 - Password storage based on Password Safe
   encrypted files

VERSION
   Version 0.2003

SYNOPSIS
   Password Safe implementation of Passwd::Keyring. Passwords are stored in
   the Password Safe (http://passwordsafe.sourceforge.net) encrypted file.

   This module does not require Password Safe to be installed, and can be
   used as generic "store many passwords in file encrypted with single
   master password" storage. Password Safe GUI, if installed, may help the
   user to review, modify, or delete saved passwords.

   Note: actual handling of Password Safe format is based on Crypt::PWSafe3
   module. Passwd::Keyring::PWSafe3 just wraps it into the interface
   compatible with other Passwd::Keyring backends.

       use Passwd::Keyring::PWSafe3;

       my $keyring = Passwd::Keyring::PWSafe3->new(
            app=>"blahblah scraper",
            group=>"Johnny web scrapers",
            file=>"/home/joe/secrets.pwsafe3",        # HOME / passwd-keyring.pwsafe3 by default
            master_password=>"very secret password",  # Or callback. See ->new docs below
       );

       my $username = "John";  # or get from .ini, or from .argv...

       my $password = $keyring->get_password($username, "blahblah.com");
       unless( $password ) {
           $password = <somehow interactively prompt for password>;

           # securely save password for future use
           $keyring->set_password($username, $password, "blahblah.com");
       }

       login_somewhere_using($username, $password);
       if( password_was_wrong ) {
           $keyring->clear_password($username, "blahblah.com");
       }

   Note: see Passwd::Keyring::Auto::KeyringAPI for detailed comments on
   keyring method semantics (this document is installed with
   `Passwd::Keyring::Auto' package).

CAVEATS
   Underlying module (Crypt::PWSafe3) in fact rewrites the whole file on
   every save (with the complete password list as read on init). This means
   that any attempts to use the file paralelly from a few programs, or from
   a few objects within one program, are doomed to cause lost updates.
   Also, all passwords from the file are kept in (unprotected) memory while
   keyring object is active. Therefore, it is recommended to use separate
   .psafe3 file for Passwd::Keyring::PWSafe3, not mixing it with possibly
   used normal Password Safe database, and to keep keyring object for a
   short time only, especially if modifications happen.

   There are some limitations in Crypt::PWSafe3 handling of Password Safe
   format. Passwords are read and saved properly and it is possible to
   alternate using them from perl, and via Password Safe GUI, but some less
   important aspects of the format, like password expiraton policy, may be
   ignored. Refer to Crypt::PWSafe3 docs for more details.

DATA MAPPING
   Group name is mapped to Password Safe folder.

   Realm is mapped as password title.

   Username and password are ... well, used as username and password.

SUBROUTINES/METHODS
 new(app=>'app name', group=>'passwords folder', file=>'pwsafe3 file', master_password=>'secret or callback', lazy_save=>1)
   Initializes the processing. Croaks if Crypt::PWSafe3 is not installed or
   master password is invalid. May create password file if it is missing.

   Handled named parameters:

   - app - symbolic application name (used in password notes)

   - group - name for the password group (used as folder name)

   - file - location of .pwsafe3 file. If not given,
   `passwd-keyring.pwsafe3' in user home directory is used. Will be created
   if does not exist. Note: absolute path is required, relative paths are
   very error prone.

   - master_password - password required to unlock the file. Can be
   specified as string, or as callback returning a string (usually some way
   of interactively asking user for the password). The callback gets two
   parameters: app and file.

     If this param is missing, module will prompt interactively for this
     password using console prompt.

   - lazy_save - if given, asks not to save the file after every change
   (saving is fairly time consuming), but only when $keyring->save is
   called or when keyring is destroyed.

   Note: it of course does not make much sense to keep app passwords in
   encrypted storage if master password is saved in plain text. The module
   most natural usage is to interactively ask for master password (and use
   it to protect noticeable number of application-specific passwords).

 set_password(username, password, realm)
   Sets (stores) password identified by given realm for given user

 get_password($user_name, $realm)
   Reads previously stored password for given user in given app. If such
   password can not be found, returns undef.

 clear_password($user_name, $realm)
   Removes given password (if present)

 save
   Saves unsaved changes, if any are present.

   Important only when lazy_save was given in constructor.

 is_persistent
   Returns info, whether this keyring actually saves passwords
   persistently.

   (true in this case)

AUTHOR
   Marcin Kasperski

BUGS
   Please report any bugs or feature requests to issue tracker at
   https://bitbucket.org/Mekk/perl-keyring-pwsafe3.

SUPPORT
   You can find documentation for this module with the perldoc command.

       perldoc Passwd::Keyring::PWSafe3

   You can also look for information at:

   http://search.cpan.org/~mekk/Passwd-Keyring-PWSafe3/

   Source code is tracked at:

   https://bitbucket.org/Mekk/perl-keyring-pwsafe3

LICENSE AND COPYRIGHT
   Copyright 2012 Marcin Kasperski.

   This program is free software; you can redistribute it and/or modify it
   under the terms of either: the GNU General Public License as published
   by the Free Software Foundation; or the Artistic License.

   See http://dev.perl.org/licenses/ for more information.

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