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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | MODULE TYPES PROVIDED | RETURN VALUES | EXAMPLES | SEE ALSO | AUTHOR | COLOPHON |
PAM_USERDB(8) Linux-PAM Manual PAM_USERDB(8)
pam_userdb - PAM module to authenticate against a db database
pam_userdb.so db=/path/database [debug] [crypt=[crypt|none]] [icase]
[dump] [try_first_pass] [use_first_pass] [unknown_ok]
[key_only]
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.
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. Note that the path to the database file should be
specified without the .db suffix.
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.
The auth and account module types are provided.
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.
auth sufficient pam_userdb.so icase db=/etc/dbtest
crypt(3), pam.conf(5), pam.d(5), pam(8)
pam_userdb was written by Cristian Gafton >gafton@redhat.com<.
This page is part of the linux-pam (Pluggable Authentication Modules
for Linux) project. Information about the project can be found at
⟨http://www.linux-pam.org/⟩. If you have a bug report for this manual
page, see ⟨//www.linux-pam.org/⟩. This page was obtained from the
tarball Linux-PAM-1.3.0.tar.gz fetched from
⟨http://www.linux-pam.org/library/⟩ on 2017-07-05. If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page, or
you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a mail
to man-pages@man7.org
Linux-PAM Manual 04/01/2016 PAM_USERDB(8)