I am using apache2 with mod_authnz_external and pwauth for authentication. pwauth itself works (I verified by calling it from the command line), however when used by apache, I always get error code 2 back (password mismatch). By using a wrapper around pwauth and calling strace on it, I narrowed the problem down: it seems like apache is not piping the password to pwauth.
In my trace I get
read(0, "user\n\n", 1024)
while I would expect
read(0, "user\npassword\n", 1024)
(which I DO get on another system where it's working).
Does anybody have a clue what's causing this?
Apache version on broken system: 2.4.46,
Apache version on working system: 2.4.18.
Config is nearly identical on both systems.
