689 lines
20 KiB
Perl
689 lines
20 KiB
Perl
package Qpsmtpd;
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use strict;
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#use warnings;
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use vars qw($TraceLevel $Spool_dir $Size_threshold);
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use Sys::Hostname;
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use Qpsmtpd::Constants;
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our $VERSION = "0.94";
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my $git;
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if (-e ".git") {
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local $ENV{PATH} = "/usr/bin:/usr/local/bin:/opt/local/bin/";
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$git = `git describe`;
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$git && chomp $git;
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}
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our $hooks = {};
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my %defaults = (
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me => hostname,
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timeout => 1200,
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);
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my $_config_cache = {};
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our %config_dir_memo;
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our $LOGGING_LOADED = 0;
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sub _restart {
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my $self = shift;
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my %args = @_;
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if ($args{restart}) {
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# reset all global vars to defaults
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$self->clear_config_cache;
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$hooks = {};
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$LOGGING_LOADED = 0;
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%config_dir_memo = ();
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$TraceLevel = LOGWARN;
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$Spool_dir = undef;
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$Size_threshold = undef;
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}
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}
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sub version { $VERSION . ($git ? "/$git" : "") }
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sub TRACE_LEVEL { $TraceLevel }; # leave for plugin compatibility
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sub hooks { $hooks; }
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sub load_logging {
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my $self = shift;
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# avoid triggering log activity
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return if ($LOGGING_LOADED || $hooks->{'logging'});
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my $configdir = $self->config_dir("logging");
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my $configfile = "$configdir/logging";
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my @loggers = $self->_config_from_file($configfile, 'logging');
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$configdir = $self->config_dir('plugin_dirs');
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$configfile = "$configdir/plugin_dirs";
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my @plugin_dirs = $self->_config_from_file($configfile, 'plugin_dirs');
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unless (@plugin_dirs) {
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my ($name) = ($0 =~ m!(.*?)/([^/]+)$!);
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@plugin_dirs = ("$name/plugins");
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}
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my @loaded;
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for my $logger (@loggers) {
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push @loaded, $self->_load_plugin($logger, @plugin_dirs);
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}
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foreach my $logger (@loaded) {
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$self->log(LOGINFO, "Loaded $logger");
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}
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$configdir = $self->config_dir("loglevel");
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$configfile = "$configdir/loglevel";
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$TraceLevel = $self->_config_from_file($configfile, 'loglevel');
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unless (defined($TraceLevel) and $TraceLevel =~ /^\d+$/) {
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$TraceLevel = LOGWARN; # Default if no loglevel file found.
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}
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$LOGGING_LOADED = 1;
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return @loggers;
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}
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sub trace_level { return $TraceLevel; }
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sub init_logger { # needed for compatibility purposes
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shift->trace_level();
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}
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sub log {
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my ($self, $trace, @log) = @_;
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$self->varlog($trace, join(" ", @log));
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}
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sub varlog {
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my ($self, $trace) = (shift, shift);
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my ($hook, $plugin, @log);
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if ($#_ == 0) { # log itself
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(@log) = @_;
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}
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elsif ($#_ == 1) { # plus the hook
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($hook, @log) = @_;
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}
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else { # called from plugin
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($hook, $plugin, @log) = @_;
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}
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$self->load_logging; # in case we don't have this loaded yet
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my ($rc) =
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$self->run_hooks_no_respond("logging", $trace, $hook, $plugin, @log)
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or return;
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return if $rc == DECLINED || $rc == OK; # plugin success
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return if $trace > $TraceLevel;
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# no logging plugins registered, fall back to STDERR
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my $prefix =
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defined $plugin && defined $hook ? " ($hook) $plugin:"
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: defined $plugin ? " $plugin:"
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: defined $hook ? " ($hook) running plugin:"
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: '';
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warn join(' ', $$ . $prefix, @log), "\n";
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}
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sub clear_config_cache {
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$_config_cache = {};
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}
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#
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# method to get the configuration. It just calls get_qmail_config by
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# default, but it could be overwritten to look configuration up in a
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# database or whatever.
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#
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sub config {
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my ($self, $c, $type) = @_;
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$self->log(LOGDEBUG, "in config($c)");
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# first try the cache
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# XXX - is this always the right thing to do? what if a config hook
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# can return different values on subsequent calls?
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if ($_config_cache->{$c}) {
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$self->log(LOGDEBUG,
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"config($c) returning (@{$_config_cache->{$c}}) from cache");
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return wantarray ? @{$_config_cache->{$c}} : $_config_cache->{$c}->[0];
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}
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# then run the hooks
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my ($rc, @config) = $self->run_hooks_no_respond("config", $c);
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$self->log(LOGDEBUG, "config($c): hook returned ($rc, @config) ");
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if ($rc == OK) {
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$self->log(LOGDEBUG,
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"setting _config_cache for $c to [@config] from hooks and returning it"
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);
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$_config_cache->{$c} = \@config;
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return wantarray ? @{$_config_cache->{$c}} : $_config_cache->{$c}->[0];
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}
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# and then get_qmail_config
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@config = $self->get_qmail_config($c, $type);
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if (@config) {
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$self->log(LOGDEBUG,
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"setting _config_cache for $c to [@config] from get_qmail_config and returning it"
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);
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$_config_cache->{$c} = \@config;
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return wantarray ? @{$_config_cache->{$c}} : $_config_cache->{$c}->[0];
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}
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# finally we use the default if there is any:
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if (exists($defaults{$c})) {
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$self->log(LOGDEBUG,
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"setting _config_cache for $c to @{[$defaults{$c}]} from defaults and returning it"
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);
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$_config_cache->{$c} = [$defaults{$c}];
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return wantarray ? @{$_config_cache->{$c}} : $_config_cache->{$c}->[0];
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}
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return;
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}
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sub config_dir {
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my ($self, $config) = @_;
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if (exists $config_dir_memo{$config}) {
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return $config_dir_memo{$config};
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}
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my $configdir = ($ENV{QMAIL} || '/var/qmail') . '/control';
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my ($path) = ($ENV{PROCESS} ? $ENV{PROCESS} : $0) =~ m!(.*?)/([^/]+)$!;
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$configdir = "$path/config" if -e "$path/config/$config";
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if (exists $ENV{QPSMTPD_CONFIG}) {
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$ENV{QPSMTPD_CONFIG} =~ /^(.*)$/; # detaint
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$configdir = $1 if -e "$1/$config";
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}
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return $config_dir_memo{$config} = $configdir;
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}
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sub plugin_dirs {
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my $self = shift;
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my @plugin_dirs = $self->config('plugin_dirs');
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unless (@plugin_dirs) {
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my ($path) = ($ENV{PROCESS} ? $ENV{PROCESS} : $0) =~ m!(.*?)/([^/]+)$!;
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@plugin_dirs = ("$path/plugins");
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}
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return @plugin_dirs;
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}
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sub get_qmail_config {
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my ($self, $config, $type) = @_;
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$self->log(LOGDEBUG, "trying to get config for $config");
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my $configdir = $self->config_dir($config);
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my $configfile = "$configdir/$config";
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# CDB config support really should be moved to a plugin
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if ($type and $type eq "map") {
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return $self->get_qmail_config_map($config, $configfile);
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};
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return $self->_config_from_file($configfile, $config);
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}
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sub get_qmail_config_map {
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my ($self, $config, $configfile) = @_;
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unless (-e $configfile . ".cdb") {
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$_config_cache->{$config} ||= [];
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return +{};
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}
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eval { require CDB_File };
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if ($@) {
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$self->log(LOGERROR,
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"No CDB Support! Did NOT read $configfile.cdb, could not load CDB_File module: $@"
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);
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return +{};
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}
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my %h;
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unless (tie(%h, 'CDB_File', "$configfile.cdb")) {
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$self->log(LOGERROR, "tie of $configfile.cdb failed: $!");
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return +{};
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}
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# We explicitly don't cache cdb entries. The assumption is that
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# the data is in a CDB file in the first place because there's
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# lots of data and the cache hit ratio would be low.
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return \%h;
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};
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sub _config_from_file {
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my ($self, $configfile, $config, $visited) = @_;
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unless (-e $configfile) {
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$_config_cache->{$config} ||= [];
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return;
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}
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$visited ||= [];
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push @$visited, $configfile;
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open my $CF, '<', $configfile or do {
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warn "$$ could not open configfile $configfile: $!";
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return;
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};
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my @config = <$CF>;
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chomp @config;
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@config = grep { length($_) and $_ !~ m/^\s*#/ and $_ =~ m/\S/ }
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map { s/^\s+//; s/\s+$//; $_; } # trim leading/trailing whitespace
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@config;
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close $CF;
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my $pos = 0;
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while ($pos < @config) {
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# recursively pursue an $include reference, if found. An inclusion which
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# begins with a leading slash is interpreted as a path to a file and will
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# supercede the usual config path resolution. Otherwise, the normal
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# config_dir() lookup is employed (the location in which the inclusion
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# appeared receives no special precedence; possibly it should, but it'd
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# be complicated beyond justifiability for so simple a config system.
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if ($config[$pos] =~ /^\s*\$include\s+(\S+)\s*$/) {
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my ($includedir, $inclusion) = ('', $1);
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splice @config, $pos, 1; # remove the $include line
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if ($inclusion !~ /^\//) {
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$includedir = $self->config_dir($inclusion);
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$inclusion = "$includedir/$inclusion";
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}
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if (grep($_ eq $inclusion, @{$visited})) {
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$self->log(LOGERROR,
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"Circular \$include reference in config $config:");
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$self->log(LOGERROR, "From $visited->[0]:");
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$self->log(LOGERROR, " includes $_")
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for (@{$visited}[1 .. $#{$visited}], $inclusion);
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return wantarray ? () : undef;
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}
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push @{$visited}, $inclusion;
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for my $inc ($self->expand_inclusion_($inclusion, $configfile)) {
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my @insertion =
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$self->_config_from_file($inc, $config, $visited);
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splice @config, $pos, 0, @insertion; # insert the inclusion
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$pos += @insertion;
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}
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}
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else {
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$pos++;
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}
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}
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$_config_cache->{$config} = \@config;
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return wantarray ? @config : $config[0];
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}
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sub expand_inclusion_ {
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my $self = shift;
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my $inclusion = shift;
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my $context = shift;
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my @includes;
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if (-d $inclusion) {
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$self->log(LOGDEBUG, "inclusion of directory $inclusion from $context");
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if (opendir(INCD, $inclusion)) {
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@includes = map { "$inclusion/$_" }
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(grep { -f "$inclusion/$_" and !/^\./ } sort readdir INCD);
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closedir INCD;
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}
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else {
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$self->log(LOGERROR,
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"Couldn't open directory $inclusion,"
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. " referenced from $context ($!)"
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);
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}
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}
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else {
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$self->log(LOGDEBUG, "inclusion of file $inclusion from $context");
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@includes = ($inclusion);
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}
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return @includes;
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}
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sub load_plugins {
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my $self = shift;
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my @plugins = $self->config('plugins');
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my @loaded;
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if ($hooks->{queue}) {
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#$self->log(LOGWARN, "Plugins already loaded");
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return @plugins;
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}
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for my $plugin_line (@plugins) {
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my $this_plugin = $self->_load_plugin($plugin_line, $self->plugin_dirs);
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push @loaded, $this_plugin if $this_plugin;
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}
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return @loaded;
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}
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sub _load_plugin {
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my $self = shift;
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my ($plugin_line, @plugin_dirs) = @_;
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# untaint the config data before passing it to plugins
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my ($safe_line) = $plugin_line =~ /^([ -~]+)$/ # all ascii printable
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or die "unsafe characters in config line: $plugin_line\n";
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my ($plugin, @args) = split /\s+/, $safe_line;
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if ($plugin =~ m/::/) {
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return $self->_load_package_plugin($plugin, $safe_line, \@args);
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};
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# regular plugins/$plugin plugin
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my $plugin_name = $plugin;
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$plugin =~ s/:\d+$//; # after this point, only used for filename
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# Escape everything into valid perl identifiers
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$plugin_name =~ s/([^A-Za-z0-9_\/])/sprintf("_%2x",unpack("C",$1))/eg;
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# second pass cares for slashes and words starting with a digit
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$plugin_name =~ s{
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(/+) # directory
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(\d?) # package's first character
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}[
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"::" . (length $2 ? sprintf("_%2x",unpack("C",$2)) : "")
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]egx;
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my $package = "Qpsmtpd::Plugin::$plugin_name";
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# don't reload plugins if they are already loaded
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unless (defined &{"${package}::plugin_name"}) {
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PLUGIN_DIR: for my $dir (@plugin_dirs) {
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if (-e "$dir/$plugin") {
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Qpsmtpd::Plugin->compile($plugin_name, $package,
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"$dir/$plugin", $self->{_test_mode}, $plugin);
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$self->log(LOGDEBUG, "Loading $safe_line from $dir/$plugin")
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unless $safe_line =~ /logging/;
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last PLUGIN_DIR;
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}
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}
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die "Plugin $plugin_name not found in our plugin dirs (",
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join(", ", @plugin_dirs), ")"
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unless defined &{"${package}::plugin_name"};
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}
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my $plug = $package->new();
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$plug->_register($self, @args);
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return $plug;
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}
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sub _load_package_plugin {
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my ($self, $plugin, $plugin_line, $args) = @_;
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# "full" package plugin (My::Plugin)
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my $package = $plugin;
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$package =~ s/[^_a-z0-9:]+//gi;
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my $eval = qq[require $package;\n]
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. qq[sub ${plugin}::plugin_name { '$plugin' }];
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$eval =~ m/(.*)/s;
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$eval = $1;
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eval $eval;
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die "Failed loading $package - eval $@" if $@;
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$self->log(LOGDEBUG, "Loading $package ($plugin_line)")
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unless $plugin_line =~ /logging/;
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my $plug = $package->new();
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$plug->_register($self, @$args);
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return $plug;
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};
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sub transaction { return {}; } # base class implements empty transaction
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sub run_hooks {
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my ($self, $hook) = (shift, shift);
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if ($hooks->{$hook}) {
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my @r;
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my @local_hooks = @{$hooks->{$hook}};
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$self->{_continuation} = [$hook, [@_], @local_hooks];
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return $self->run_continuation();
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}
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return $self->hook_responder($hook, [0, ''], [@_]);
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}
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sub run_hooks_no_respond {
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my ($self, $hook) = (shift, shift);
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if ($hooks->{$hook}) {
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my @r;
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for my $code (@{$hooks->{$hook}}) {
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eval { (@r) = $code->{code}->($self, $self->transaction, @_); };
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$@
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and warn("FATAL PLUGIN ERROR [" . $code->{name} . "]: ", $@)
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and next;
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if ($r[0] == YIELD) {
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die "YIELD not valid from $hook hook";
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}
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last unless $r[0] == DECLINED;
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}
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$r[0] = DECLINED if not defined $r[0];
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return @r;
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}
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return (0, '');
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}
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sub continue_read { } # subclassed in -async
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sub pause_read { die "Continuations only work in qpsmtpd-async" }
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sub run_continuation {
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my $self = shift;
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#my $t1 = $SAMPLER->("run_hooks", undef, 1);
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die "No continuation in progress" unless $self->{_continuation};
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$self->continue_read();
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my $todo = $self->{_continuation};
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$self->{_continuation} = undef;
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my $hook = shift @$todo || die "No hook in the continuation";
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my $args = shift @$todo || die "No hook args in the continuation";
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my @r;
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while (@$todo) {
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my $code = shift @$todo;
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#my $t2 = $SAMPLER->($hook . "_" . $code->{name}, undef, 1);
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#warn("Got sampler called: ${hook}_$code->{name}\n");
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$self->varlog(LOGDEBUG, $hook, $code->{name});
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my $tran = $self->transaction;
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eval { (@r) = $code->{code}->($self, $tran, @$args); };
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$@
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and
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$self->log(LOGCRIT, "FATAL PLUGIN ERROR [" . $code->{name} . "]: ",
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$@)
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and next;
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!defined $r[0]
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and $self->log(LOGERROR,
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"plugin "
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. $code->{name}
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. " running the $hook hook returned undef!"
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)
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and next;
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# note this is wrong as $tran is always true in the
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# current code...
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if ($tran) {
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my $tnotes = $tran->notes($code->{name});
|
|
$tnotes->{"hook_$hook"}->{'return'} = $r[0]
|
|
if (!defined $tnotes || ref $tnotes eq "HASH");
|
|
}
|
|
else {
|
|
my $cnotes = $self->connection->notes($code->{name});
|
|
$cnotes->{"hook_$hook"}->{'return'} = $r[0]
|
|
if (!defined $cnotes || ref $cnotes eq "HASH");
|
|
}
|
|
|
|
if ($r[0] == YIELD) {
|
|
$self->pause_read();
|
|
$self->{_continuation} = [$hook, $args, @$todo];
|
|
return @r;
|
|
}
|
|
elsif ( $r[0] == DENY
|
|
or $r[0] == DENYSOFT
|
|
or $r[0] == DENY_DISCONNECT
|
|
or $r[0] == DENYSOFT_DISCONNECT)
|
|
{
|
|
$r[1] = "" if not defined $r[1];
|
|
$self->log(LOGDEBUG,
|
|
"Plugin "
|
|
. $code->{name}
|
|
. ", hook $hook returned "
|
|
. return_code($r[0])
|
|
. ", $r[1]"
|
|
);
|
|
$self->run_hooks_no_respond("deny", $code->{name}, $r[0], $r[1])
|
|
unless ($hook eq "deny");
|
|
}
|
|
else {
|
|
$r[1] = "" if not defined $r[1];
|
|
$self->log(LOGDEBUG,
|
|
"Plugin "
|
|
. $code->{name}
|
|
. ", hook $hook returned "
|
|
. return_code($r[0])
|
|
. ", $r[1]"
|
|
);
|
|
$self->run_hooks_no_respond("ok", $code->{name}, $r[0], $r[1])
|
|
unless ($hook eq "ok");
|
|
}
|
|
|
|
last unless $r[0] == DECLINED;
|
|
}
|
|
$r[0] = DECLINED if not defined $r[0];
|
|
|
|
# hook_*_parse() may return a CODE ref..
|
|
# ... which breaks when splitting as string:
|
|
@r = map { split /\n/ } @r unless (ref($r[1]) eq "CODE");
|
|
return $self->hook_responder($hook, \@r, $args);
|
|
}
|
|
|
|
sub hook_responder {
|
|
my ($self, $hook, $msg, $args) = @_;
|
|
|
|
#my $t1 = $SAMPLER->("hook_responder", undef, 1);
|
|
my $code = shift @$msg;
|
|
|
|
my $responder = $hook . '_respond';
|
|
if (my $meth = $self->can($responder)) {
|
|
return $meth->($self, $code, $msg, $args);
|
|
}
|
|
return $code, @$msg;
|
|
}
|
|
|
|
sub _register_hook {
|
|
my $self = shift;
|
|
my ($hook, $code, $unshift) = @_;
|
|
|
|
if ($unshift) {
|
|
unshift @{$hooks->{$hook}}, $code;
|
|
}
|
|
else {
|
|
push @{$hooks->{$hook}}, $code;
|
|
}
|
|
}
|
|
|
|
sub spool_dir {
|
|
my $self = shift;
|
|
|
|
unless ($Spool_dir) { # first time through
|
|
$self->log(LOGDEBUG, "Initializing spool_dir");
|
|
$Spool_dir = $self->config('spool_dir')
|
|
|| Qpsmtpd::Utils->tildeexp('~/tmp/');
|
|
|
|
$Spool_dir .= "/" unless ($Spool_dir =~ m!/$!);
|
|
|
|
$Spool_dir =~ /^(.+)$/ or die "spool_dir not configured properly";
|
|
$Spool_dir = $1; # cleanse the taint
|
|
my $Spool_perms = $self->config('spool_perms') || '0700';
|
|
|
|
if (!-d $Spool_dir) { # create it if it doesn't exist
|
|
mkdir($Spool_dir, oct($Spool_perms))
|
|
or die "Could not create spool_dir $Spool_dir: $!";
|
|
}
|
|
|
|
# Make sure the spool dir has appropriate rights
|
|
$self->log(LOGWARN,
|
|
"Permissions on spool_dir $Spool_dir are not $Spool_perms")
|
|
unless ((stat $Spool_dir)[2] & 07777) == oct($Spool_perms);
|
|
}
|
|
|
|
return $Spool_dir;
|
|
}
|
|
|
|
# For unique filenames. We write to a local tmp dir so we don't need
|
|
# to make them unpredictable.
|
|
my $transaction_counter = 0;
|
|
|
|
sub temp_file {
|
|
my $self = shift;
|
|
my $filename =
|
|
$self->spool_dir() . join(":", time, $$, $transaction_counter++);
|
|
return $filename;
|
|
}
|
|
|
|
sub temp_dir {
|
|
my $self = shift;
|
|
my $mask = shift || 0700;
|
|
my $dirname = $self->temp_file();
|
|
-d $dirname
|
|
or mkdir($dirname, $mask)
|
|
or die "Could not create temporary directory $dirname: $!";
|
|
return $dirname;
|
|
}
|
|
|
|
sub size_threshold {
|
|
my $self = shift;
|
|
unless (defined $Size_threshold) {
|
|
$Size_threshold = $self->config('size_threshold') || 0;
|
|
$self->log(LOGDEBUG, "size_threshold set to $Size_threshold");
|
|
}
|
|
return $Size_threshold;
|
|
}
|
|
|
|
sub authenticated {
|
|
my $self = shift;
|
|
return (defined $self->{_auth} ? $self->{_auth} : "");
|
|
}
|
|
|
|
sub auth_user {
|
|
my $self = shift;
|
|
return (defined $self->{_auth_user} ? $self->{_auth_user} : "");
|
|
}
|
|
|
|
sub auth_mechanism {
|
|
my $self = shift;
|
|
return (defined $self->{_auth_mechanism} ? $self->{_auth_mechanism} : "");
|
|
}
|
|
|
|
1;
|
|
|
|
__END__
|
|
|
|
=head1 NAME
|
|
|
|
Qpsmtpd - base class for the qpsmtpd mail server
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
This is the base class for the qpsmtpd mail server. See
|
|
L<http://smtpd.develooper.com/> and the I<README> file for more information.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2001-2012 Ask Bjørn Hansen, Develooper LLC. See the
|
|
LICENSE file for more information.
|
|
|
|
=cut
|
|
|