If an IPA client uses the SSH integration and a local user logs in with
SSH, the sss_ssh_authorizedkeys looks up their keys in the SSH
responder, which doesn't find the user and returns ENOENT. The
sss_ssh_authorizedkeys reports a failure on any error, including ENOENT
which produced a confusing error message in the logs.

This patch adds a new error code that handles users that are not found
by SSSD but exist on the system and also special cases root with the
same error code. Therefore, logging in as a local user no longer prints
an error message.

Resolves:
https://fedorahosted.org/sssd/ticket/3003

Reviewed-by: Pavel Březina <pbrezina@redhat.com>

setlocale needs some environment variables
to be set in order to work. These variables
are not present in some special cases. We
should not fail completely in these cases
but continue with the compatible C locale.

Resolves:
https://fedorahosted.org/sssd/ticket/2785

Reviewed-by: Michal Židek <mzidek@redhat.com>

Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>
Reviewed-by: Nikolai Kondrashov <Nikolai.Kondrashov@redhat.com>

https://fedorahosted.org/sssd/ticket/1697

It is safer to isolate the checked (unknown/untrusted)
value on the left hand side in the conditions
to avoid overflows/underflows.

Reviewed-by: Petr Cech <pcech@redhat.com>

Use a script to update DEBUG macro invocations to use it as a variadic
macro, supplying format string and its arguments directly, instead of
wrapping them in parens.

This script was used to update the code:

grep -rwl --include '*.[hc]' DEBUG . |
    while read f; do
        mv "$f"{,.orig}
        perl -e \
            'use strict;
             use File::Slurp;
             my $text=read_file(\*STDIN);
             $text=~s#(\bDEBUG\s*\([^(]+)\((.*?)\)\s*\)\s*;#$1$2);#gs;
             print $text;' < "$f.orig" > "$f"
        rm "$f.orig"
    done

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
Reviewed-by: Stephen Gallagher <sgallagh@redhat.com>
Reviewed-by: Simo Sorce <simo@redhat.com>

Instead of appending @domain to names when the --domain option of sss_ssh_* is
used, put domain name in a separate field in client requests.

https://fedorahosted.org/sssd/ticket/1495