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pam_limits: PAM module to limit resources


pam_limits - PAM module to limit resources


pam_limits.so [change_uid] [conf=/path/to/limits.conf] [debug] [utmp_early] [noaudit]


The pam_limits PAM module sets limits on the system resources that can be obtained in a user-session. Users of uid=0 are affected by this limits, too. By default limits are taken from the /etc/security/limits.conf config file. Then individual *.conf files from the /etc/security/limits.d/ directory are read. The files are parsed one after another in the order of "C" locale. The effect of the individual files is the same as if all the files were concatenated together in the order of parsing. If a config file is explicitly specified with a module option then the files in the above directory are not parsed. The module must not be called by a multithreaded application. If Linux PAM is compiled with audit support the module will report when it denies access based on limit of maximum number of concurrent login sessions.


change_uid Change real uid to the user for who the limits are set up. Use this option if you have problems like login not forking a shell for user who has no processes. Be warned that something else may break when you do this. conf=/path/to/limits.conf Indicate an alternative limits.conf style configuration file to override the default. debug Print debug information. utmp_early Some broken applications actually allocate a utmp entry for the user before the user is admitted to the system. If some of the services you are configuring PAM for do this, you can selectively use this module argument to compensate for this behavior and at the same time maintain system-wide consistency with a single limits.conf file. noaudit Do not report exceeded maximum logins count to the audit subsystem.
Only the session module type is provided.
PAM_ABORT Cannot get current limits. PAM_IGNORE No limits found for this user. PAM_PERM_DENIED New limits could not be set. PAM_SERVICE_ERR Cannot read config file. PAM_SESSION_ERR Error recovering account name. PAM_SUCCESS Limits were changed. PAM_USER_UNKNOWN The user is not known to the system.


/etc/security/limits.conf Default configuration file


For the services you need resources limits (login for example) put a the following line in /etc/pam.d/login as the last line for that service (usually after the pam_unix session line): #%PAM-1.0 # # Resource limits imposed on login sessions via pam_limits # session required pam_limits.so Replace "login" for each service you are using this module.


limits.conf(5), pam.d(5), pam(7).


pam_limits was initially written by Cristian Gafton <gafton@redhat.com> PAM_LIMITS(8)

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