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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | MODULE TYPES PROVIDED | RETURN VALUES | EXAMPLES | SEE ALSO | AUTHOR | COLOPHON |
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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. Note that password hashes, both from
db and computed, will be printed to syslog.
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 >[email protected]<.
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 project's upstream Git repository
⟨https://github.com/linux-pam/linux-pam.git⟩ on 2023-12-22. (At
that time, the date of the most recent commit that was found in
the repository was 2023-12-18.) 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
[email protected]
Linux-PAM Manual 12/22/2023 PAM_USERDB(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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