By default rules for (un)setting of variables are taken from the config file /etc/security/pam_env.conf. If this file does not exist /usr/share/pam/security/pam_env.conf is used. An alternate file can be specified with the conffile option, which overrules all other files.

Second a file (/etc/environment by default) with simple KEY=VAL pairs on separate lines will be read. If this file does not exist, /usr/share/pam/etc/environment is used. With the envfile option an alternate file can be specified, which overrules all other files. And with the readenv option this can be completely disabled.

Third it will read a user configuration file ($HOME/.pam_environment by default). The default file can be changed with the user_envfile option and it can be turned on and off with the user_readenv option.

Since setting of PAM environment variables can have side effects to other modules, this module should be the last one on the stack.

This module is only executed if the main application calls pam_setcred(3) or pam_open_session(3). The module does nothing and returns PAM_IGNORE if called by pam_authenticate(3).  

OPTIONS

conffile=/path/to/pam_env.conf

Indicate an alternative pam_env.conf style configuration file to override the default. This can be useful when different services need different environments.

debug

A lot of debug information is printed with syslog(3).

envfile=/path/to/environment

Indicate an alternative environment file to override the default. The syntax are simple KEY=VAL pairs on separate lines. The export instruction can be specified for bash compatibility, but will be ignored. This can be useful when different services need different environments.

readenv=0|1

Turns on or off the reading of the file specified by envfile (0 is off, 1 is on). By default this option is on.

user_envfile=filename

Indicate an alternative .pam_environment file to override the default. The syntax is the same as for /etc/security/pam_env.conf. The filename is relative to the user home directory. This can be useful when different services need different environments.

user_readenv=0|1

Turns on or off the reading of the user specific environment file. 0 is off, 1 is on. By default this option is off as user supplied environment variables in the PAM environment could affect behavior of subsequent modules in the stack without the consent of the system administrator.

Due to problematic security this functionality is deprecated since the 1.5.0 version and will be removed completely at some point in the future.

MODULE TYPES PROVIDED

The auth and session module types are provided.  

RETURN VALUES

PAM_ABORT

Not all relevant data or options could be gotten.

PAM_BUF_ERR

Memory buffer error.

PAM_IGNORE

No pam_env.conf and environment file was found or the module got called by pam_authenticate(3).

PAM_SUCCESS

Environment variables were set.

FILES

/usr/share/pam/security/pam_env.conf, /etc/security/pam_env.conf

Default configuration file

/usr/share/pam/environment, /etc/environment

Default environment file

$HOME/.pam_environment

User specific environment file

SEE ALSO

pam_env.conf(5), pam.d(5), pam(8), environ(7).  

AUTHOR

pam_env was written by Dave Kinchlea <kinch@kinch.ark.com>.

Index

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

MODULE TYPES PROVIDED

RETURN VALUES

FILES

SEE ALSO

AUTHOR