pam_tty_audit icanon log switch

[Miloslav Trmač]

----- Original Message -----
> On Thu, Apr 18, 2013 at 04:07:08PM -0400, Richard Guy Briggs wrote:
> > On Thu, Apr 18, 2013 at 03:31:36PM -0400, Miloslav Trmač wrote:
> > > > diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
> > > > index 9f096f1..a863669 100644
> > > > --- a/include/uapi/linux/audit.h
> > > > +++ b/include/uapi/linux/audit.h
> > > > @@ -369,7 +369,8 @@ struct audit_status {
> > > >  };
> > > >  
> > > >  struct audit_tty_status {
> > > > -	__u32		enabled; /* 1 = enabled, 0 = disabled */
> > > > +	__u32		enabled;	/* 1 = enabled, 0 = disabled */
> > > > +	__u32		log_icanon;	/* 1 = enabled, 0 = disabled */
> > > >  };
> > > 
> > > Also, would it make sense for the user-space API to be more general
> > > about expressing the intent ("log passwords")?  I don't know, being
> > > precise about the exact effect of the option is also beneficial.
> > 
> > Hmmm, I'll have to ponder that...
> 
> I am inclined to leave it named as is for precision.

I suggested it might be better to change the name because with (icanon & !echo) being the discriminator, "log_icanon" is no longer precise.  I can't think of an identifier that is both precise and understandable - neither log_icanon_noecho or log_passwords are the obvious possibilities, neither makes me enthusiastic.

Perhaps it doesn't matter that much what the audit_tty_status member is called - that's an implementation aspect and anybody touching this needs to understand the precise effects regardless of the name of the member.  The pam_tty_audit option name is user-visible and should be easy to understand and use.  (I'm not sure changing the topic like this is an improvement - it seems natural to use the same name for both, and even the users may need to understand the implications of icanon & !echo; I'm just hoping this might lead to better suggestions.)
    Mirek