On Tue, Jun 8, 2021 at 10:51 AM Tom Hughes <t...@compton.nu> wrote:
>
> On 08/06/2021 14:51, Stephen Gallagher wrote:
>
> > I was thinking about suggesting a similar PAM module to convert
> > existing hashes, but I suspect that we'd be coming up against some
> > issues with security policy and separation of actions. Right now, I
> > expect that SELinux permits PAM processes to have read-only access to
> > /etc/shadow, but such a change would necessitate read/write access,
> > which is riskier. It's also why PAM has separate activities for
> > authentication, authorization and password-change.
>
> Surely it has to allow write as well because any authentication can
> already prompt for a password change if the password is expired?
>

It's been a while, but I *think* I remember that PAM sends back an
"expired password" message and the client application (eg. `login`)
then calls the pam_chpass() stack.
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