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PAM_USERDB(8)                            Linux-PAM Manual                           PAM_USERDB(8)

NAME
       pam_userdb - PAM module to authenticate against a db database

SYNOPSIS
       pam_userdb.so db=/path/database [debug] [crypt=[crypt|none]] [icase] [dump]
                     [try_first_pass] [use_first_pass] [unknown_ok] [key_only]

DESCRIPTION
       The pam_userdb module is used to verify a username/password pair against values stored in
       a Berkeley DB database. The database is indexed by the username, and the data fields
       corresponding to the username keys are the passwords.

OPTIONS
       crypt=[crypt|none]
           Indicates whether encrypted or plaintext passwords are stored in the database. If it
           is crypt, passwords should be stored in the database in crypt(3) form. If none is
           selected, passwords should be stored in the database as plaintext.

       db=/path/database
           Use the /path/database database for performing lookup. There is no default; the module
           will return PAM_IGNORE if no database is provided.

       debug
           Print debug information.

       dump
           Dump all the entries in the database to the log. Don't do this by default!

       icase
           Make the password verification to be case insensitive (ie when working with
           registration numbers and such). Only works with plaintext password storage.

       try_first_pass
           Use the authentication token previously obtained by another module that did the
           conversation with the application. If this token can not be obtained then the module
           will try to converse. This option can be used for stacking different modules that need
           to deal with the authentication tokens.

       use_first_pass
           Use the authentication token previously obtained by another module that did the
           conversation with the application. If this token can not be obtained then the module
           will fail. This option can be used for stacking different modules that need to deal
           with the authentication tokens.

       unknown_ok
           Do not return error when checking for a user that is not in the database. This can be
           used to stack more than one pam_userdb module that will check a username/password pair
           in more than a database.

       key_only
           The username and password are concatenated together in the database hash as
           'username-password' with a random value. if the concatenation of the username and
           password with a dash in the middle returns any result, the user is valid. this is
           useful in cases where the username may not be unique but the username and password
           pair are.

MODULE TYPES PROVIDED
       The auth and account module types are provided.

RETURN VALUES
       PAM_AUTH_ERR
           Authentication failure.

       PAM_AUTHTOK_RECOVERY_ERR
           Authentication information cannot be recovered.

       PAM_BUF_ERR
           Memory buffer error.

       PAM_CONV_ERR
           Conversation failure.

       PAM_SERVICE_ERR
           Error in service module.

       PAM_SUCCESS
           Success.

       PAM_USER_UNKNOWN
           User not known to the underlying authentication module.

EXAMPLES
           auth  sufficient pam_userdb.so icase db=/etc/dbtest.db

SEE ALSO
       crypt(3), pam.conf(5), pam.d(5), pam(7)

AUTHOR
       pam_userdb was written by Cristian Gafton >gafton@redhat.com<.

Linux-PAM Manual                            06/18/2013                              PAM_USERDB(8)

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