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It is a good idea to write pam configurations specifically for quickshell if you want to do anything other than match the default login flow.
A good example of this is having a configuration that allows entering a password or fingerprint in any order.
Pam configuration files are a list of rules, each on a new line in the following form:
<type> <control_flag> <module_path> [options]
Each line runs in order.
PamContext currently only works with the auth type, as other types require root
access to check.
The control flags you’re likely to use are required and sufficient.
required rules must pass for authentication to succeed.sufficient rules will bypass any remaining rules and return on success.Note that you should have at least one required rule or pam will fail with an undocumented error.
Pam works with a set of modules that handle various authentication mechanisms.
Some common ones include pam_unix.so which handles passwords and pam_fprintd.so
which handles fingerprints.
These modules have options but none are required for basic functionality.
Authenticate with only a password:
auth required pam_unix.so
Authenticate with only a fingerprint:
auth required pam_fprintd.so
Try to authenticate with a fingerprint first, but if that fails fall back to a password:
auth sufficient pam_fprintd.so
auth required pam_unix.so
Require both a fingerprint and a password:
auth required pam_fprintd.so
auth required pam_unix.so
See also: Oracle: PAM configuration file