715 lines
19 KiB
Perl
Executable File
715 lines
19 KiB
Perl
Executable File
#!/usr/bin/perl -w
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# pam-auth-update: update /etc/pam.d/common-* from /usr/share/pam-configs
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#
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# Update the /etc/pam.d/common-* files based on the per-package profiles
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# provided in /usr/share/pam-configs/ taking into consideration user's
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# preferences (as determined via debconf prompting).
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#
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# Written by Steve Langasek <steve.langasek@canonical.com>
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#
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# Copyright (C) 2008 Canonical Ltd.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of version 3 of the GNU General Public License as
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# published by the Free Software Foundation.
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#
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# # This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
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# USA.
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use strict;
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use Debconf::Client::ConfModule ':all';
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use IPC::Open2 'open2';
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version('2.0');
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my $capb=capb('backup escape');
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my $inputdir = '/usr/share/pam-configs';
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my $template = 'libpam-runtime/profiles';
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my $errtemplate = 'libpam-runtime/conflicts';
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my $overridetemplate = 'libpam-runtime/override';
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my $blanktemplate = 'libpam-runtime/no_profiles_chosen';
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my $titletemplate = 'libpam-runtime/title';
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my $confdir = '/etc/pam.d';
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my $savedir = '/var/lib/pam';
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my (%profiles, @sorted, @enabled, @conflicts, @new, %removals, %to_enable);
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my $force = 0;
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my $package = 0;
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my $priority = 'high';
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my %md5sums = (
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'auth' => ['8d4fe17e66ba25de16a117035d1396aa'],
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'account' => ['3c0c362eaf3421848b679d63fd48c3fa'],
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'password' => [
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'50fce2113dfda83ac8bdd5a6e706caec',
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'4bd7610f2e85f8ddaef79c7db7cb49eb',
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'9ba753d0824276b44bcadfee1f87b6bc',
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],
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'session' => [
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'240fb92986c885b327cdb21dd641da8c',
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'4a25673e8b36f1805219027d3be02cd2',
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'73144a2f4e609a922a51e301cd66a57e',
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],
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'session-noninteractive' => [
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'ad2b78ce1498dd637ef36469430b6ac6',
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'a20e8df3469bfe25c13a3b39161b30f0',
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],
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);
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opendir(DIR, $inputdir) || die "could not open config directory: $!";
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while (my $profile = readdir(DIR)) {
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next if ($profile eq '.' || $profile eq '..');
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%{$profiles{$profile}} = parse_pam_profile($inputdir . '/' . $profile);
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}
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closedir DIR;
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# use a '--force' arg to specify that /etc/pam.d should be overwritten;
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# used only on upgrades where the postinst has already determined that the
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# checksums match. Module packages other than libpam-runtime itself must
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# NEVER use this option! Document with big skullses and crossboneses! It
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# needs to be exposed for libpam-runtime because that's the package that
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# decides whether we have a pristine config to be converted, and knows
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# whether the version being upgraded from is one for which the conversion
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# should be done.
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while ($#ARGV >= 0) {
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my $opt = shift;
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if ($opt eq '--force') {
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$force = 1;
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} elsif ($opt eq '--package') {
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$package = 1;
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} elsif ($opt eq '--remove') {
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while ($#ARGV >= 0) {
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last if ($ARGV[0] =~ /^--/);
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$removals{shift @ARGV} = 1;
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}
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# --remove implies --package
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$package = 1 if (keys(%removals));
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} elsif ($opt eq '--enable') {
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while ($#ARGV >= 0) {
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last if ($ARGV[0] =~ /^--/);
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$to_enable{shift @ARGV} = 1;
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}
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# --enable implies --package
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$package = 1 if (keys(%to_enable));
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}
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}
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$priority = 'medium' if ($package);
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x_loadtemplatefile('/var/lib/dpkg/info/libpam-runtime.templates','libpam-runtime');
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# always sort by priority, so we have consistency and don't have to
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# shuffle later
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@sorted = sort { $profiles{$b}->{'Priority'} <=> $profiles{$a}->{'Priority'}
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|| $b cmp $a }
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keys(%profiles);
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# If we're being called for package removal, filter out those options here
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@sorted = grep { !$removals{$_} } @sorted;
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subst($template, 'profile_names', join(', ',@sorted));
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subst($template, 'profiles',
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join(', ', map { $profiles{$_}->{'Name'} } @sorted));
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my $diff = diff_profiles($confdir,$savedir);
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if ($diff) {
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@enabled = grep { !$removals{$_} } @{$diff->{'mods'}};
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} else {
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@enabled = split(/, /,get($template));
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}
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# find out what we've seen, so we can ignore those defaults
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my %seen;
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if (-e $savedir . '/seen') {
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open(SEEN,$savedir . '/seen');
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while (<SEEN>) {
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chomp;
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$seen{$_} = 1;
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}
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close(SEEN);
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}
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# filter out any options that are no longer available for any reason
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@enabled = grep { $profiles{$_} } @enabled;
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# an empty module set is an error, so in that case grab all the defaults
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if (!@enabled) {
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%seen = ();
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$priority = 'high' unless ($force);
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}
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# add configs to enable
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push(@enabled,
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grep { $to_enable{$_} } @sorted);
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# add any previously-unseen configs
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push(@enabled,
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grep { $profiles{$_}->{'Default'} eq 'yes' && !$seen{$_} } @sorted);
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@enabled = sort { $profiles{$b}->{'Priority'} <=> $profiles{$a}->{'Priority'}
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|| $b cmp $a }
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@enabled;
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my $prev = '';
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@enabled = grep { $_ ne $prev && (($prev) = $_) } @enabled;
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# Do we have any new options to show? If not, we shouldn't reprompt the
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# user, at any priority level, unless explicitly called.
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@new = grep { !$seen{$_} } @sorted;
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settitle($titletemplate);
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# if diff_profiles() fails, and we weren't passed a 'force' argument
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# (because this isn't an upgrade from an old version, or the checksum
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# didn't match, or we're being called by some other module package), prompt
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# the user whether to override. If the user declines (the default), we
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# never again manage this config unless manually called with '--force'.
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if (!$diff && !$force) {
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input('high',$overridetemplate);
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go();
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$force = 1 if (get($overridetemplate) eq 'true');
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}
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if (!$diff && !$force) {
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print STDERR <<EOF;
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pam-auth-update: Local modifications to /etc/pam.d/common-*, not updating.
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pam-auth-update: Run pam-auth-update --force to override.
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EOF
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exit;
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}
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umask(0022);
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do {
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@conflicts = ();
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if (@new || !$package) {
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fset($template,'seen','false');
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}
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set($template,join(', ', @enabled));
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input($priority,$template);
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go();
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@enabled = split(/, /, get($template));
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# in case of conflicts, automatically unset the lower priority
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# item of each pair
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foreach my $elem (@enabled)
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{
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for (my $i=$#enabled; $i >= 0; $i--)
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{
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my $conflict = $enabled[$i];
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if ($profiles{$elem}->{'Conflicts'}->{$conflict}) {
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splice(@enabled,$i,1);
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my $desc = $profiles{$elem}->{'Name'}
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. ', ' . $profiles{$conflict}->{'Name'};
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push(@conflicts,$desc);
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}
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}
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}
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if (@conflicts) {
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subst($errtemplate, 'conflicts', join("\\n", @conflicts));
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input('high',$errtemplate);
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}
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set($template, join(', ', @enabled));
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if (!@enabled) {
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input('high',$blanktemplate);
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# we can only end up here by user error, but give them another
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# shot at selecting a correct config anyway.
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fset($template,'seen','false');
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}
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} while (@conflicts || !@enabled);
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# the decision has been made about what configs to use, so even if
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# something fails after this, we shouldn't go munging the default
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# options again. Save the list of known configs to /var/lib/pam.
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open(SEEN,"> $savedir/seen");
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for my $i (@sorted) {
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print SEEN "$i\n";
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}
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close(SEEN);
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# @enabled now contains our list of profiles to use for piecing together
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# a config
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# we have:
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# - templates into which we insert the specialness
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# - magic comments denoting the beginning and end of our managed block;
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# looking at only the functional config lines would potentially let us
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# handle more cases, at the expense of much greater complexity, so
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# pass on this at least for the first round
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# - a representation of the autogenerated config stored in /var/lib/pam,
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# that we can diff against in order to account for changed options or
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# manually dropped modules
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# - a hash describing the local modifications the user has made to the
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# config; these are always preserved unless manually overridden with
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# the --force option
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write_profiles(\%profiles, \@enabled, $confdir, $savedir, $diff, $force);
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# take a single line from a stock config, and merge it with the
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# information about local admin edits
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sub merge_one_line
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{
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my ($line,$diff,$count) = @_;
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my (@opts,$modline);
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my ($adds,$removes);
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$line =~ /^((\[[^]]+\]|\w+)\s+\S+)\s*(.*)/;
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@opts = split(/\s+/,$3);
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$modline = $1;
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$modline =~ s/end/$count/g;
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if ($diff) {
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my $mod = $modline;
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$mod =~ s/(\[[^0-9]*)[0-9]+(.*\])/$1$2/g;
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$adds = \%{$diff->{'add'}{$mod}};
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$removes = \%{$diff->{'remove'}{$mod}};
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} else {
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$adds = $removes = undef;
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}
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for (my $i = 0; $i <= $#opts; $i++) {
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if ($adds->{$opts[$i]}) {
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delete $adds->{$opts[$i]};
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}
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if ($removes->{$opts[$i]}) {
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splice(@opts,$i,1);
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$i--;
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}
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}
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return $modline . " " . join(' ',@opts,sort keys(%{$adds})) . "\n";
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}
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# return the lines for a given config name, type, and position in the stack
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sub lines_for_module_and_type
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{
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my ($profiles, $mod, $type, $modpos) = @_;
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if ($modpos == 0 && $profiles->{$mod}{$type . '-Initial'}) {
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return $profiles->{$mod}{$type . '-Initial'};
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}
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return $profiles->{$mod}{$type};
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}
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# create a single PAM config from the indicated template and selections,
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# writing to a new file
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sub create_from_template
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{
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my($template,$dest,$profiles,$enabled,$diff,$type) = @_;
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my $state = 0;
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my $uctype = ucfirst($type);
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$type =~ s/-noninteractive//;
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open(INPUT,$template) || return 0;
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open(OUTPUT,">$dest") || return 0;
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while (<INPUT>) {
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if ($state == 1) {
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if (/^# here's the fallback if no module succeeds/) {
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print OUTPUT;
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$state++;
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}
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next;
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}
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if ($state == 3) {
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if (/^# end of pam-auth-update config/) {
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print OUTPUT;
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$state++;
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}
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next;
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}
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print OUTPUT;
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my ($pattern,$val);
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if ($state == 0) {
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$pattern = '^# here are the per-package modules \(the "Primary" block\)';
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$val = 'Primary';
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} elsif ($state == 2) {
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$pattern = '^# and here are more per-package modules \(the "Additional" block\)';
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$val = 'Additional';
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} else {
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next;
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}
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if (/$pattern/) {
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my $i = 0;
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my $count = 0;
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# first we need to get a count of lines that we're
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# going to output, so we can fix up the jumps correctly
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for my $mod (@{$enabled}) {
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my $output;
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next if (!$profiles->{$mod}{$uctype . '-Type'});
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next if $profiles->{$mod}{$uctype . '-Type'} ne $val;
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$output = lines_for_module_and_type($profiles, $mod, $uctype, $i++);
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# bypasses a perl warning about @_, sigh
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my @tmparr = split("\n+",$output);
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$count += @tmparr;
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}
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# in case anything tries to jump in the 'additional'
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# block, let's try not to jump off the stack...
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$count-- if ($val eq 'Additional');
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# no primary block, so output a stock pam_permit line
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# to keep the stack intact
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if ($val eq 'Primary' && $count == 0)
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{
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print OUTPUT "$type\t[default=1]\t\t\tpam_permit.so\n";
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}
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$i = 0;
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for my $mod (@{$enabled}) {
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my $output;
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my @output;
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next if (!$profiles->{$mod}{$uctype . '-Type'});
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next if $profiles->{$mod}{$uctype . '-Type'} ne $val;
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$output = lines_for_module_and_type($profiles, $mod, $uctype, $i++);
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for my $line (split("\n",$output)) {
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$line = merge_one_line($line,$diff,
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$count);
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print OUTPUT "$type\t$line";
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$count--;
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}
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}
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$state++;
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}
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}
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close(INPUT);
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close(OUTPUT);
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if ($state < 4) {
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unlink($dest);
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return 0;
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}
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return 1;
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}
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# take a template file, strip out everything between the markers, and
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# return the md5sum of the remaining contents. Used for testing for
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# local modifications of the boilerplate.
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sub get_template_md5sum
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{
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my($template) = @_;
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my $state = 0;
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open(INPUT,$template) || return '';
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my($md5sum_fd,$output_fd);
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my $pid = open2($md5sum_fd, $output_fd, 'md5sum');
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return '' if (!$pid);
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while (<INPUT>) {
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if ($state == 1) {
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if (/^# here's the fallback if no module succeeds/) {
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print $output_fd $_;
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$state++;
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}
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next;
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}
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if ($state == 3) {
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if (/^# end of pam-auth-update config/) {
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print $output_fd $_;
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$state++;
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}
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next;
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}
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print $output_fd $_;
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my ($pattern,$val);
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if ($state == 0) {
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$pattern = '^# here are the per-package modules \(the "Primary" block\)';
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} elsif ($state == 2) {
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$pattern = '^# and here are more per-package modules \(the "Additional" block\)';
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} else {
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next;
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}
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if (/$pattern/) {
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$state++;
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}
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}
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close(INPUT);
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close($output_fd);
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my $md5sum = <$md5sum_fd>;
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close($md5sum_fd);
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waitpid $pid, 0;
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$md5sum = (split(/\s+/,$md5sum))[0];
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return $md5sum;
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}
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# merge a set of module declarations into a set of new config files,
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# using the information returned from diff_profiles().
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sub write_profiles
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{
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my($profiles,$enabled,$confdir,$savedir,$diff,$force) = @_;
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if (! -d $savedir) {
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mkdir($savedir);
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}
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# because we can't atomically replace both /var/lib/pam/$foo and
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# /etc/pam.d/common-$foo at the same time, take steps to make this
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# somewhat robust
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for my $type ('auth','account','password','session',
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'session-noninteractive')
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{
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my $target = $confdir . '/common-' . $type;
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my $template = $target;
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my $dest = $template . '.pam-new';
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my $diff = $diff;
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if ($diff) {
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$diff = \%{$diff->{$type}};
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}
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# Detect if the template is unmodified, and if so, use
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# the version from /usr/share. Depends on knowing the
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# md5sums of the originals.
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my $md5sum = get_template_md5sum($template);
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for my $i (@{$md5sums{$type}}) {
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if ($md5sum eq $i) {
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$template = '/usr/share/pam/common-' . $type;
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last;
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}
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}
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# first, write out the new config
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if (!create_from_template($template,$dest,$profiles,$enabled,
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$diff,$type))
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{
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if (!$force) {
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return 0;
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}
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$template = '/usr/share/pam/common-' . $type;
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if (!create_from_template($template,$dest,$profiles,
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$enabled,$diff,$type))
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{
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return 0;
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}
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}
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# then write out the saved config
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if (!open(OUTPUT, "> $savedir/$type.new")) {
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unlink($dest);
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return 0;
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}
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my $i = 0;
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my $uctype = ucfirst($type);
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for my $mod (@{$enabled}) {
|
|
my $output;
|
|
next if (!$profiles->{$mod}{$uctype . '-Type'});
|
|
next if ($profiles->{$mod}{$uctype . '-Type'} eq 'Additional');
|
|
|
|
$output = lines_for_module_and_type($profiles, $mod, $uctype, $i++);
|
|
if ($output) {
|
|
print OUTPUT "Module: $mod\n";
|
|
print OUTPUT $output . "\n";
|
|
}
|
|
}
|
|
|
|
# no primary block, so output a stock pam_permit line
|
|
if ($i == 0)
|
|
{
|
|
print OUTPUT "Module: null\n";
|
|
print OUTPUT "[default=1]\t\t\tpam_permit.so\n";
|
|
}
|
|
|
|
$i = 0;
|
|
for my $mod (@{$enabled}) {
|
|
my $output;
|
|
next if (!$profiles->{$mod}{$uctype . '-Type'});
|
|
next if ($profiles->{$mod}{$uctype . '-Type'} eq 'Primary');
|
|
|
|
$output = lines_for_module_and_type($profiles, $mod, $uctype, $i++);
|
|
if ($output) {
|
|
print OUTPUT "Module: $mod\n";
|
|
print OUTPUT $output . "\n";
|
|
}
|
|
}
|
|
|
|
close(OUTPUT);
|
|
|
|
# then do the renames, back-to-back
|
|
# we have to use system because File::Copy is in
|
|
# perl-modules, not perl-base
|
|
if (-e "$target" && $force) {
|
|
system('cp','-f',$target,$target . '.pam-old');
|
|
}
|
|
rename($dest,$target);
|
|
rename("$savedir/$type.new","$savedir/$type");
|
|
}
|
|
|
|
# at the end of a successful write, reset the 'seen' flag and the
|
|
# value of the debconf override question.
|
|
fset($overridetemplate,'seen','false');
|
|
set($overridetemplate,'false');
|
|
}
|
|
|
|
# reconcile the current config in /etc/pam.d with the saved ones in
|
|
# /var/lib/pam; returns a hash of profile names and the corresponding
|
|
# options that should be added/removed relative to the stock config.
|
|
# returns false if any of the markers are missing that permit a merge,
|
|
# or on any other failure.
|
|
sub diff_profiles
|
|
{
|
|
my ($sourcedir,$savedir) = @_;
|
|
my (%diff);
|
|
|
|
@{$diff{'mods'}} = ();
|
|
# Load the saved config from /var/lib/pam, then iterate through all
|
|
# lines in the current config that are in the managed block.
|
|
# If anything fails here, just return immediately since we then
|
|
# have nothing to merge; instead, the caller will decide later
|
|
# whether to force an overwrite.
|
|
for my $type ('auth','account','password','session',
|
|
'session-noninteractive')
|
|
{
|
|
my (@saved,$modname);
|
|
|
|
open(SAVED,$savedir . '/' . $type) || return 0;
|
|
while (<SAVED>) {
|
|
if (/^Module: (.*)/) {
|
|
$modname = $1;
|
|
next;
|
|
}
|
|
chomp;
|
|
# trim out the destination of any jumps; this saves
|
|
# us from having to re-parse everything just to fix
|
|
# up the jump lengths, when changes to these will
|
|
# already show up as inconsistencies elsewhere
|
|
s/(\[[^0-9]*)[0-9]+(.*\])/$1$2/g;
|
|
s/(\[.*)end(.*\])/$1$2/g;
|
|
my (@temp) = ($modname,$_);
|
|
push(@saved,\@temp);
|
|
}
|
|
close(SAVED);
|
|
|
|
my $state = 0;
|
|
my (@prev_opts,$curmod);
|
|
my $realtype = $type;
|
|
$realtype =~ s/-noninteractive//;
|
|
|
|
open(CURRENT,$sourcedir . '/common-' . $type) || return 0;
|
|
while (<CURRENT>) {
|
|
if ($state == 0) {
|
|
$state = 1
|
|
if (/^# here are the per-package modules \(the "Primary" block\)/);
|
|
next;
|
|
}
|
|
if ($state == 1) {
|
|
s/^$realtype\s+//;
|
|
if (/^# here's the fallback if no module succeeds/) {
|
|
$state = 2;
|
|
next;
|
|
}
|
|
}
|
|
if ($state == 2) {
|
|
$state = 3
|
|
if (/^# and here are more per-package modules \(the "Additional" block\)/);
|
|
next;
|
|
}
|
|
if ($state == 3) {
|
|
last if (/^# end of pam-auth-update config/);
|
|
s/^$realtype\s+//;
|
|
}
|
|
|
|
my $found = 0;
|
|
my $curopts;
|
|
while (!$found && $#saved >= 0) {
|
|
my $line;
|
|
($modname,$line) = @{$saved[0]};
|
|
shift(@saved);
|
|
$line =~ /^((\[[^]]+\]|\w+)\s+\S+)\s*(.*)/;
|
|
@prev_opts = split(/\s+/,$3);
|
|
$curmod = $1;
|
|
# FIXME: the key isn't derived from the config
|
|
# name, so collisions are possible if more
|
|
# than one config references the same module
|
|
|
|
$_ =~ s/(\[[^0-9]*)[0-9]+(.*\])/$1$2/g;
|
|
# check if this is a match for the current line
|
|
if ($_ =~ /^\Q$curmod\E\s*(.*)$/) {
|
|
$found = 1;
|
|
$curopts = $1;
|
|
push(@{$diff{'mods'}},$modname);
|
|
}
|
|
}
|
|
|
|
# there's a line in the live config that doesn't
|
|
# correspond to anything from the saved config.
|
|
# treat this as a failure; it's very error-prone
|
|
# to decide what to do with an added line that
|
|
# didn't come from a package.
|
|
return 0 if (!$found);
|
|
|
|
for my $opt (split(/\s+/,$curopts)) {
|
|
my $found = 0;
|
|
for (my $i = 0; $i <= $#prev_opts; $i++) {
|
|
if ($prev_opts[$i] eq $opt) {
|
|
$found = 1;
|
|
splice(@prev_opts,$i,1);
|
|
}
|
|
}
|
|
$diff{$type}{'add'}{$curmod}{$opt} = 1 if (!$found);
|
|
}
|
|
for my $opt (@prev_opts) {
|
|
$diff{$type}{'remove'}{$curmod}{$opt} = 1;
|
|
}
|
|
}
|
|
close(CURRENT);
|
|
|
|
# we couldn't parse the config, so the merge fails
|
|
return 0 if ($state < 3);
|
|
}
|
|
return \%diff;
|
|
}
|
|
|
|
# simple function to parse a provided config file, in pseudo-RFC822
|
|
# format,
|
|
sub parse_pam_profile
|
|
{
|
|
my ($profile) = $_[0];
|
|
my $fieldname;
|
|
my %profile;
|
|
open(PROFILE, $profile) || die "could not read profile $profile: $!";
|
|
while (<PROFILE>) {
|
|
if (/^(\S+):\s+(.*)\s*$/) {
|
|
$fieldname = $1;
|
|
# compatibility with the first implementation round;
|
|
# "Auth-Final" is now just called "Auth"
|
|
$fieldname =~ s/-Final$//;
|
|
if ($fieldname eq 'Conflicts') {
|
|
foreach my $elem (split(/, /, $2)) {
|
|
$profile{'Conflicts'}->{$elem} = 1;
|
|
}
|
|
} else {
|
|
$profile{$fieldname} = $2;
|
|
}
|
|
} else {
|
|
chomp;
|
|
s/^\s+//;
|
|
s/\s+$//;
|
|
$profile{$fieldname} .= "\n$_" if ($_);
|
|
$profile{$fieldname} =~ s/^[\n\s]+//;
|
|
}
|
|
}
|
|
close(PROFILE);
|
|
if (!defined($profile{'Session-Interactive-Only'})) {
|
|
$profile{'Session-noninteractive-Type'} = $profile{'Session-Type'};
|
|
$profile{'Session-noninteractive'} = $profile{'Session'};
|
|
$profile{'Session-noninteractive-Initial'} = $profile{'Session-Initial'};
|
|
}
|
|
return %profile;
|
|
}
|