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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)