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|
#!/usr/bin/perl -T
#----------------------------------------------------------------------
# Dovecot userdb lookup proxy table for user iteration
# Copyright © 2017,2020 Guilhem Moulin <guilhem@fripost.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#----------------------------------------------------------------------
use warnings;
use strict;
use Errno qw/EINTR/;
use Net::LDAPI;
use Net::LDAP::Constant qw/LDAP_CONTROL_PAGED LDAP_SUCCESS/;
use Net::LDAP::Control::Paged ();
use Net::LDAP::Util qw/ldap_explode_dn/;
use Authen::SASL;
my $BASE = "ou=virtual,dc=fripost,dc=org";
# clean up PATH
$ENV{PATH} = join ':', qw{/usr/bin /bin};
delete @ENV{qw/IFS CDPATH ENV BASH_ENV/};
# number of pre-forked servers and maximum requests per worker
my $nProc = 1;
my $maxRequests = 1;
sub server();
# fdopen(3) the file descriptor FD
die "This service must be socket-activated.\n"
unless defined $ENV{LISTEN_PID} and $ENV{LISTEN_PID} == $$
and defined $ENV{LISTEN_FDS} and $ENV{LISTEN_FDS} == 1;
open my $S, '+<&=', 3 or die "fdopen: $!";
my @CHILDREN;
for (my $i = 0; $i < $nProc-1; $i++) {
my $pid = fork() // die "fork: $!";
if ($pid) {
push @CHILDREN, $pid;
} else {
server(); # child, never return
exit;
}
}
server();
waitpid $_ => 0 foreach @CHILDREN;
exit $?;
#############################################################################
sub server() {
for (my $n = 0; $n < $maxRequests; $n++) {
accept(my $conn, $S) or do {
next if $! == EINTR;
die "accept: $!";
};
my $hello = $conn->getline() // '';
unless ($hello =~ /\AH(\d+)\t(\d+)\t(\d+)(?:\t.*)?\n\z/) {
warn "Invalid greeting line: $hello\n";
close $conn or warn "Can't close: $!";
next;
}
# <major-version> <minor-version> <value type>
unless ($1 == 2 and $2 == 2 and $3 == 0) {
warn "Unsupported protocol version $1.$2 (or value type $3)\n";
close $conn or warn "Can't close: $!";
next;
}
my $cmd = $conn->getline() // '';
if ($cmd =~ /\AI(\d+)\t(\d+)\t(.*)\n\z/) {
iterate($conn, $1, $2, $3);
}
else {
fail($conn => "Unknown command line: $cmd");
}
close $conn or warn "Can't close: $!";
}
}
sub fail($;$) {
my ($fh, $msg) = @_;
$fh->printflush("F\n");
print STDERR $msg, "\n" if defined $msg;
}
sub dn2user($) {
my $dn = shift;
$dn = ldap_explode_dn($dn, casefold => "lower");
if (defined $dn and $#$dn == 4
and defined (my $l = $dn->[0]->{fvl})
and defined (my $d = $dn->[1]->{fvd})) {
return $l ."@". $d;
}
}
# list all users (even the inactive ones)
sub iterate($$$$) {
my ($fh, $flags, $max_rows, $prefix) = @_;
unless ($flags == 0) {
fail($fh => "Unsupported iterate flags $flags");
return;
}
my $ldap = Net::LDAPI::->new();
$ldap->bind( undef, sasl => Authen::SASL::->new(mechanism => "EXTERNAL") )
or do { fail($fh => "Error: Couldn't bind"); return; };
my $page = Net::LDAP::Control::Paged::->new(size => 100);
my $callback = sub($$) {
my ($mesg, $entry) = @_;
return unless defined $entry;
my $dn = $entry->dn();
if (defined (my $user = dn2user($dn))) {
$fh->printf("O%s%s\t\n", $prefix, $user);
} else {
print STDERR "Couldn't extract username from dn: ", $dn, "\n";
}
$mesg->pop_entry;
};
my @search_args = (
base => $BASE,
, scope => "children"
, deref => "never"
, filter => "(objectClass=FripostVirtualUser)"
, sizelimit => $max_rows
, control => [$page]
, callback => $callback
, attrs => ["1.1"]
);
my $cookie;
while (1) {
my $mesg = $ldap->search(@search_args);
last unless $mesg->code == LDAP_SUCCESS;
my ($resp) = $mesg->control(LDAP_CONTROL_PAGED) or last;
$cookie = $resp->cookie();
goto SEARCH_DONE unless defined $cookie and length($cookie) > 0;
$page->cookie($cookie);
}
if (defined $cookie and length($cookie) > 0) {
fail($fh => "Abnormal exit from LDAP search, aborting");
$page->cookie($cookie);
$page->size(0);
$ldap->search(@search_args);
}
SEARCH_DONE:
$ldap->unbind();
$fh->printflush("\n");
}
|
