pam_unix

provides standard Unix authentication

Standard Unix authentication

$ auth required pam_unix.so

Password management

$ password required pam_unix.so sha512 shadow

Session management

$ session required pam_unix.so

Null password check

$ auth required pam_unix.so nullok

pam_unix.so [options]

pam_unix provides standard Unix authentication. Uses /etc/passwd and shadow.
The module handles basic auth. Core PAM component.

nullok

Allow empty passwords.

sha512

Use SHA-512 hashing.

shadow

Use shadow passwords.

remember=N

Remember N passwords.

try_first_pass

Use previous password.

Core PAM module. Configuration critical. Hash algorithm choice.

pam_unix provides traditional Unix authentication via passwd/shadow.