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#!/usr/bin/perl -T # SPDX-License-Identifier: BSD-2-Clause #------------------------------------------------------------------------------ # This is amavisd-signer, a DKIM signing service daemon for amavisd. # It uses an AM.PDP protocol lookalike to receive a request from amavisd # and provides two services: choosing a signing key, and signing a # message digest with a chosen DKIM private key. # # Author: Mark Martinec <Mark.Martinec@ijs.si> # # Copyright (c) 2010-2014, Mark Martinec # All rights reserved. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions # are met: # 1. Redistributions of source code must retain the above copyright notice, # this list of conditions and the following disclaimer. # 2. Redistributions in binary form must reproduce the above copyright notice, # this list of conditions and the following disclaimer in the documentation # and/or other materials provided with the distribution. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE # POSSIBILITY OF SUCH DAMAGE. # # The views and conclusions contained in the software and documentation are # those of the authors and should not be interpreted as representing official # policies, either expressed or implied, of the Jozef Stefan Institute. # (the above license is the 2-clause BSD license, also known as # a "Simplified BSD License", and pertains to this program only) # # Patches and problem reports are welcome. # The latest version of this program is available at: # http://www.ijs.si/software/amavisd/ #------------------------------------------------------------------------------ # Using a separate signing service (which may run under a dedicated UID or # GID or as root, having exclusive access to private keys) releaves amavisd # process from needing to have access to private keys. Separating roles can # provide improved protection for DKIM private keys, and/or can provide more # flexibility in choosing a signing key. # # Usage: # amavisd-signer & package AmavisSigner; use strict; use re 'taint'; use warnings FATAL => 'utf8'; no warnings 'uninitialized'; use Sys::Syslog; # used by Net::Server for logging use MIME::Base64; use Mail::DKIM; use Mail::DKIM::PrivateKey; use Net::Server 0.91; use Net::Server::Multiplex; use Amavis::Util; use vars qw(@ISA); @ISA = qw(Net::Server::Multiplex); use vars qw( $VERSION $log_level %dkim_signing_keys_by_domain @dkim_signing_keys_list @dkim_signing_keys_storage @dkim_signature_options_bysender_maps $daemon_chroot_dir $daemon_user @daemon_groups $pid_file $daemonize $inet_socket_bind @listen_sockets $listen_queue_size $syslog_ident $syslog_facility ); $VERSION = 1.001; # 20100730 # # Please adjust the following settings as necessary: # $daemon_user = 'amavis'; @daemon_groups = 'amavis'; # $daemon_chroot_dir = '/var/lib/amavis'; # chroot directory or undef # $daemonize = 1; $log_level = 2; # 0..5 $syslog_facility = 'mail'; $syslog_ident = 'amavisd-signer'; # the $inet_socket_bind and @listen_sockets should correspond to a # setting $dkim_signing_service in amavisd.conf : $inet_socket_bind = '127.0.0.1'; @listen_sockets = ( 20203 ); $listen_queue_size = undef; # uses a default # Load all available private keys and supply their public key RR constraints. # Arguments are a domain, a selector, a key (a file name of a private key in # PEM format), followed by optional attributes/constraints (tags, represented # here as Perl hash key/value pairs) which are allowed by RFC 4871 in a public # key resource record (v, g, h, k, n, s, t), of which only g, h, k, s and t # are considered to be constraints limiting the choice of a signing key. # # signing domain selector private key options # ------------- -------- ---------------------- ---------- # dkim_key('example.org', 'abc', '/var/db/dkim/a.key.pem'); # dkim_key('example.org', 'yyy', '/var/db/dkim/b.key.pem', t=>'s'); # dkim_key('example.org', 'zzz', '/var/db/dkim/b.key.pem', h=>'sha256'); # dkim_key('example.com', 'sel-2008', '/var/db/dkim/sel-example-com.key.pem', # t=>'s:y', g=>'*', k=>'rsa', h=>'sha256:sha1', s=>'email', # n=>'testing; 1, 2'); # dkim_key('guest.example.com', 'g', '/var/db/dkim/g-guest-ex-com.key.pem'); # dkim_key('mail.example.com', 'notif', '/var/db/dkim/notif-mail.key.pem'); # @dkim_signature_options_bysender_maps maps author/sender addresses or # domains to signature tags/requirements; possible signature tags according # to RFC 4871 are: (v), a, (b), (bh), c, d, (h), i, l, q, s, (t), x, z; # of which the following are determined implicitly: v, b, bh, h, t # (tag h is controlled by %signed_header_fields); currently ignored tags # are l and z; instead of an absolute expiration time (tag x) one may use # a pseudo tag 'ttl' to specify a relative expiration time in seconds, which # is converted to an absolute expiration time prior to signing: x = t + ttl; # a built-in default is provided for each tag if no better match is found # # @dkim_signature_options_bysender_maps = ( { # 'postmaster@mail.example.com' => { a => 'rsa-sha1', ttl => 7*24*3600 }, # 'spam-reporter@example.com' => { a => 'rsa-sha1', ttl => 7*24*3600 }, # 'mail.example.com' => { a => 'rsa-sha1', ttl => 10*24*3600 }, # # explicit 'd' forces a third-party signature on foreign (hosted) domains # 'guest.example' => { d => 'guest.example.com' }, # '.example.com' => { d => 'example.com' }, # # catchall defaults # '.' => { a => 'rsa-sha256', c => 'relaxed/simple', ttl => 30*24*3600 }, # # 'd' defaults to a domain of an author/sender address, # # 's' defaults to whatever selector is offered by a matching key # } ); # # No further user-configurable settings below (but feel free # to customize code in choose_key_request() or replace it altogether. # sub ll($) { my($level) = @_; $level <= $log_level; } my($server); # a Net::Server object sub do_log($$;@) { my($level, $errmsg, @args) = @_; $errmsg = sprintf($errmsg,@args) if @args; if ($level <= $log_level) { my($prio); # Net::Server logging priority # 0=err, 1=warning, 2=notice, 3=info, 4=debug if ($level >= 3) { $prio = 4 } elsif ($level >= 0) { $prio = 2 } elsif ($level >= -1) { $prio = 1 } else { $prio = 0 } $server->log($prio, sanitize_str($errmsg)); # Net::Server directs STDERR to the log_file # print STDERR sanitize_str($errmsg)."\n"; } } sub sanitize_str { my($str, $keep_eol) = @_; my(%map) = ("\r" => '\\r', "\n" => '\\n', "\f" => '\\f', "\t" => '\\t', "\b" => '\\b', "\e" => '\\e', "\\" => '\\\\'); if ($keep_eol) { $str =~ s/([^\012\040-\133\135-\176])/ # and \240-\376 ? exists($map{$1}) ? $map{$1} : sprintf(ord($1)>255 ? '\\x{%04x}' : '\\%03o', ord($1))/eg; } else { $str =~ s/([^\040-\133\135-\176])/ # and \240-\376 ? exists($map{$1}) ? $map{$1} : sprintf(ord($1)>255 ? '\\x{%04x}' : '\\%03o', ord($1))/eg; } $str; } sub split_address($) { my($mailbox) = @_; local($1,$2); $mailbox =~ /^ (.*?) ( \@ (?: \[ (?: \\. | [^\]\\] ){0,999} (?: \] | \z) | [^\[\@] )* ) \z/xs ? ($1, $2) : ($mailbox, ''); } # THE dkim_key IS A DIRECT COPY OF THE SAME ROUTINE FROM amavisd # # Store a private DKIM signing key for a given domain and selector. # The argument $key can be a Mail::DKIM::PrivateKey object or a file # name containing a key in a PEM format (e.g. as generated by openssl). # For compatibility with dkim_milter the signing domain can include a '*' # as a wildcard - this is not recommended as this way amavisd could produce # signatures which have no corresponding public key published in DNS. # The proper way is to have one dkim_key entry for each published DNS RR. # Optional arguments can provide additional information about the resource # record (RR) of a public key, i.e. its options according to RFC 4871. # The subroutine is typically called from a configuration file, once for # each signing key available. # sub dkim_key($$$;@) { my($domain,$selector,$key) = @_; shift; shift; shift; @_%2 == 0 or die "dkim_key: a list of key/value pairs expected as options\n"; my(%key_options) = @_; # remaining args are options from a public key RR defined $domain && $domain ne '' or die "dkim_key: domain must not be empty: ($domain,$selector,$key)"; defined $selector && $selector ne '' or die "dkim_key: selector must not be empty: ($domain,$selector,$key)"; my($key_storage_ind); if (ref $key) { # key already preprocessed and provided as an object push(@dkim_signing_keys_storage, [$key]); $key_storage_ind = $#dkim_signing_keys_storage; } else { # assume a name of a file containing a private key in PEM format my($fname) = $key; my($pem_fh) = IO::File->new; # open a file with a private key $pem_fh->open($fname,'<') or die "Can't open PEM file $fname: $!"; my(@stat_list) = stat($pem_fh); # soft-link friendly @stat_list or warn "Error on accessing $fname: $!"; my($dev,$inode) = @stat_list; if ($dev && $inode) { for my $j (0..$#dkim_signing_keys_storage) { # same file reused? my($k,$dv,$in,$fn) = @{$dkim_signing_keys_storage[$j]}; if ($dv == $dev && $in == $inode) { $key_storage_ind = $j; last } } } if (!defined($key_storage_ind)) { # read file and store its contents as a new entry my($nbytes,$buff); $key = ''; while (($nbytes=$pem_fh->read($buff,16384)) > 0) { $key .= $buff } defined $nbytes or die "Error reading key from file $fname: $!"; push(@dkim_signing_keys_storage, [$key,$dev,$inode,$fname]); $key_storage_ind = $#dkim_signing_keys_storage; } $pem_fh->close or die "Error closing file $fname: $!"; $key_options{k} = 'rsa' if defined $key_options{k}; # force RSA } $domain = lc($domain) if !ref($domain); # possibly a regexp $selector = lc($selector); $key_options{domain} = $domain; $key_options{selector} = $selector; $key_options{key_storage_ind} = $key_storage_ind; if (@dkim_signing_keys_list > 100) { # sorry, skip the test to avoid slow O(n^2) searches } else { !(grep { $_->{domain} eq $domain && $_->{selector} eq $selector } @dkim_signing_keys_list) or die "dkim_key: selector $selector for domain $domain already in use\n"; } $key_options{key_ind} = $#dkim_signing_keys_list + 1; push(@dkim_signing_keys_list, \%key_options); # using a list preserves order } # THE dkim_key_postprocess IS A DIRECT COPY OF THE SAME ROUTINE FROM amavisd # # Convert private keys (as strings in PEM format) into RSA objects # and do some pre-processing on @dkim_signing_keys_list entries # (may run unprivileged) # sub dkim_key_postprocess() { # convert private keys (as strings in PEM format) into RSA objects for my $ks (@dkim_signing_keys_storage) { my($pkcs1,$dev,$inode,$fname) = @$ks; if (ref($pkcs1) && UNIVERSAL::isa($pkcs1,'Crypt::OpenSSL::RSA')) { # it is already a Crypt::OpenSSL::RSA object } else { # assume a string is a private key in PEM format, convert it to RSA obj $ks->[0] = Crypt::OpenSSL::RSA->new_private_key($pkcs1); } } for my $ent (@dkim_signing_keys_list) { my($domain) = $ent->{domain}; $dkim_signing_keys_by_domain{$domain} = [] if !$dkim_signing_keys_by_domain{$domain}; } my($any_wild); my($j) = 0; for my $ent (@dkim_signing_keys_list) { $ent->{v} = 'DKIM1' if !defined $ent->{v}; # provide a default if (defined $ent->{n}) { # encode n as qp-section (rfc4871, rfc2047) $ent->{n} =~ s{([\000-\037\177=;"])}{sprintf('=%02X',ord($1))}egs; } my($domain) = $ent->{domain}; if (ref($domain) eq 'Regexp') { $ent->{domain_re} = $domain; $any_wild = sprintf("key#%d, %s", $j+1, $domain) if !defined $any_wild; } elsif ($domain =~ /\*/) { # wildcarded signing domain in a key declaration, evil, asks for trouble! # support wildcards in signing domain for compatibility with dkim_milter my($regexp) = $domain; $regexp =~ s/\*{2,}/*/gs; # collapse successive wildcards # '*' is a wildcard, quote the rest $regexp =~ s{ ([@#/.^$|*+?(){}\[\]\\]) }{$1 eq '*' ? '.*' : '\\'.$1}gex; $regexp = '^' . $regexp . '\\z'; # implicit anchors $regexp =~ s/^\^\.\*//s; # remove leading anchor if redundant $regexp =~ s/\.\*\\z\z//s; # remove trailing anchor if redundant $regexp = '(?:)' if $regexp eq ''; # just in case, non-empty regexp # presence of {'domain_re'} entry lets get_dkim_key use this regexp # instead of a direct string comparision with {'domain'} $ent->{domain_re} = qr{$regexp}; # compiled regexp object $any_wild = sprintf("key#%d, %s", $j+1, $domain) if !defined $any_wild; } # %dkim_signing_keys_by_domain entries contain lists of indices into # the @dkim_signing_keys_list of all potentially applicable signing keys. # This hash (keyed by domain name) avoids linear searching for signing # keys for all fully-specified domains in @dkim_signing_keys_list. # Wildcarded entries must still be looked up sequentially at run-time # to preserve the declared order and the 'first match wins' paradigm. # Such entries are only supported for compatibility with dkim_milter # and are evil because amavisd has no quick way of verifying that DNS RR # really exists, so signatures generated by amavisd can fail when not all # possible DNS resource records exist for wildcarded signing domains. # if (!defined($ent->{domain_re})) { # no regexp, just plain match on domain push(@{$dkim_signing_keys_by_domain{$domain}}, $j); } else { # a wildcard in a signing domain, compatibility with dkim_milter # wildcarded signing domain potentially matches any _by_domain entry for my $d (keys %dkim_signing_keys_by_domain) { push(@{$dkim_signing_keys_by_domain{$d}}, $j); } # the '*' entry collects only wildcarded signing keys $dkim_signing_keys_by_domain{'*'} = [] if !$dkim_signing_keys_by_domain{'*'}; push(@{$dkim_signing_keys_by_domain{'*'}}, $j); } $j++; } do_log(0,"dkim: wildcard in signing domain (%s), may produce unverifiable ". "signatures with no published public key, avoid!", $any_wild) if $any_wild; } # THE get_dkim_key IS A DIRECT COPY OF THE SAME ROUTINE FROM amavisd # # Fetch a private DKIM signing key for a given signing domain, with its # resource-record (RR) constraints compatible with proposed signature options. # The first such key is returned as a hash; if no key is found an empty hash # is returned. When a selector (s) is given it must match the selector of # a key; when algorithm (a) is given, the key type and a hash algorithm must # match the desired use too; the service type (s) must be 'email' or '*'; # when identity (i) is given it must match the granularity (g) of a key; # # sign.opts. key options # ---------- ----------- # d => domain # s => selector # a => k, h(list) # i => g, t=s # sub get_dkim_key(@) { @_ % 2 == 0 or die "get_dkim_key: a list of pairs is expected as query opts"; my(%options) = @_; # signature options (v, a, c, d, h, i, l, q, s, t, x, z), # of which d is required, while s, a and t are optional but taken into # account in searching for a compatible key - the rest are ignored my(%key_options); my($domain) = $options{d}; defined $domain && $domain ne '' or die "get_dkim_key: domain is required, but tag 'd' is missing"; $domain = lc($domain); my(@indices) = $dkim_signing_keys_by_domain{$domain} ? @{$dkim_signing_keys_by_domain{$domain}} : $dkim_signing_keys_by_domain{'*'} ? @{$dkim_signing_keys_by_domain{'*'}} : (); if (@indices) { my($selector) = $options{s}; $selector = $selector eq '' ? undef : lc($selector) if defined $selector; local($1,$2); my($keytype,$hashalg) = defined $options{a} && $options{a} =~ /^([a-z0-9]+)-(.*)\z/is ? ($1,$2) : ('rsa',undef); my($identity_localpart,$identity_domain) = !defined($options{i}) ? () : split_address($options{i}); $identity_localpart = '' if !defined $identity_localpart; $identity_domain = '' if !defined $identity_domain; # find the first key (associated with a domain) with compatible options for my $j (@indices) { my($ent) = $dkim_signing_keys_list[$j]; next unless defined $ent->{domain_re} ? $domain =~ $ent->{domain_re} : $domain eq $ent->{domain}; next if defined $selector && $ent->{selector} ne $selector; next if $keytype ne (exists $ent->{k} ? $ent->{k} : 'rsa'); next if exists $ent->{s} && !(grep { $_ eq '*' || $_ eq 'email' } split(/:/, $ent->{s}) ); next if defined $hashalg && exists $ent->{'h'} && !(grep { $_ eq $hashalg } split(/:/, $ent->{'h'}) ); if (defined($options{i})) { if (lc($identity_domain) eq $domain) { # ok } elsif (exists $ent->{t} && (grep {$_ eq 's'} split(/:/,$ent->{t}))) { next; # no subdomains allowed } if (!exists($ent->{g}) || $ent->{g} eq '*') { # ok } elsif ($ent->{g} =~ /^ ([^*]*) \* (.*) \z/xs) { next if $identity_localpart !~ /^ \Q$1\E .* \Q$2\E \z/xs; } else { next if $identity_localpart ne $ent->{g}; } } %key_options = %$ent; last; # found a suitable match } } if (defined $key_options{key_storage_ind}) { # obtain actual key from @dkim_signing_keys_storage ($key_options{key}) = @{$dkim_signing_keys_storage[$key_options{key_storage_ind}]}; } %key_options; } sub proto_encode($@) { my($attribute_name,@strings) = @_; local($1); for ($attribute_name,@strings) { # just in case, handle non-octet characters: s/([^\000-\377])/sprintf('\\x{%04x}',ord($1))/eg and do_log(-1,"proto_encode: non-octet character encountered: %s", $_); } $attribute_name =~ # encode all but alfanumerics, . _ + - s/([^0-9a-zA-Z._+-])/sprintf("%%%02x",ord($1))/eg; for (@strings) { # encode % and nonprintables s/([^\041-\044\046-\176])/sprintf("%%%02x",ord($1))/eg; } $attribute_name . '=' . join(' ',@strings); } sub proto_decode($) { my($str) = @_; local($1); $str =~ s/%([0-9a-fA-F]{2})/pack("C",hex($1))/egs; $str; } sub split_localpart($$) { my($localpart, $delimiter) = @_; my($owner_request_special) = 1; # configurable ??? my($extension); local($1,$2); if ($localpart =~ /^(postmaster|mailer-daemon|double-bounce)\z/i) { # do not split these, regardless of what the delimiter is } elsif ($delimiter eq '-' && $owner_request_special && $localpart =~ /^owner-.|.-request\z/si) { # don't split owner-foo or foo-request } elsif ($localpart =~ /^(.+?)(\Q$delimiter\E.*)\z/s) { ($localpart, $extension) = ($1, $2); # extension includes a delimiter # do not split the address if the result would have a null localpart } ($localpart, $extension); } sub unique_ref(@) { my($r) = @_ == 1 && ref($_[0]) ? $_[0] : \@_; # accept list, or a list ref my(%seen); my(@result) = grep { defined($_) && !$seen{$_}++ } @$r; \@result; } sub make_query_keys($$$;$) { my($addr,$at_with_user,$include_bare_user,$append_string) = @_; my($localpart,$domain) = split_address($addr); $domain = lc($domain); my($saved_full_localpart) = $localpart; $localpart = lc($localpart); ### if !c('localpart_is_case_sensitive'); # chop off leading @, and trailing dots local($1); $domain = $1 if $domain =~ /^\@?(.*?)\.*\z/s; my($extension); my($delim) = '+'; ### c('recipient_delimiter'); if ($delim ne '') { ($localpart,$extension) = split_localpart($localpart,$delim); # extension includes a delimiter since amavisd-new-2.5.0! } $extension = '' if !defined $extension; # mute warnings my($append_to_user,$prepend_to_domain) = $at_with_user ? ('@','') : ('','@'); my(@keys); # a list of query keys push(@keys, $addr); # as is push(@keys, $localpart.$extension.'@'.$domain) if $extension ne ''; # user+foo@example.com push(@keys, $localpart.'@'.$domain); # user@example.com if ($include_bare_user) { # typically enabled for local users only push(@keys, $localpart.$extension.$append_to_user) if $extension ne ''; # user+foo(@) push(@keys, $localpart.$append_to_user); # user(@) } push(@keys, $prepend_to_domain.$domain); # (@)sub.example.com if ($domain =~ /\[/) { # don't split address literals push(@keys, $prepend_to_domain.'.'); # (@). } else { my(@dkeys); my($d) = $domain; for (;;) { # (@).sub.example.com (@).example.com (@).com (@). push(@dkeys, $prepend_to_domain.'.'.$d); last if $d eq ''; $d = ($d =~ /^([^.]*)\.(.*)\z/s) ? $2 : ''; } if (@dkeys > 10) { @dkeys = @dkeys[$#dkeys-9 .. $#dkeys] } # sanity limit push(@keys,@dkeys); } if (defined $append_string && $append_string ne '') { $_ .= $append_string for @keys; } my($keys_ref) = unique_ref(\@keys); # remove duplicates ll(5) && do_log(5,"query_keys: %s", join(', ',@$keys_ref)); # the rhs replacement strings are similar to what would be obtained # by lookup_re() given the following regular expression: # /^( ( ( [^\@]*? ) ( \Q$delim\E [^\@]* )? ) (?: \@ (.*) ) )$/xs my($rhs) = [ # a list of right-hand side replacement strings $addr, # $1 = User+Foo@Sub.Example.COM $saved_full_localpart, # $2 = User+Foo $localpart, # $3 = user $extension, # $4 = +foo $domain, # $5 = sub.example.com ]; ($keys_ref, $rhs); } sub lookup_hash($$;$%) { my($addr, $hash_ref,$get_all,%options) = @_; ref($hash_ref) eq 'HASH' or die "lookup_hash: arg2 must be a hash ref: $hash_ref"; local($1,$2,$3,$4); my(@matchingkey,@result); my($append_string); $append_string = $options{AppendStr} if defined $options{AppendStr}; my($keys_ref,$rhs_ref) = make_query_keys($addr,1,1,$append_string); for my $key (@$keys_ref) { # do the search if (exists $$hash_ref{$key}) { # got it push(@result,$$hash_ref{$key}); push(@matchingkey,$key); last if !$get_all; } } # do the right-hand side replacements if any $n, ${n} or $(n) is specified for my $r (@result) { # remember that $r is just an alias to array elements if (defined($r) && !ref($r) && index($r,'$') >= 0) { # plain string with $ my($any) = $r =~ s{ \$ ( (\d+) | \{ (\d+) \} | \( (\d+) \) ) } { my($j)=$2+$3+$4; $j<1 ? '' : $rhs_ref->[$j-1] }gxse; # bring taintedness of input to the result $r .= substr($addr,0,0) if $any; } } if (!$get_all) { ($result[0], $matchingkey[0]) } else { (\@result, \@matchingkey) } } sub lookup2($$$%) { my($get_all, $addr, $tables_ref, %options) = @_; (@_ - 3) % 2 == 0 or die "lookup2: options argument not in pairs (not hash)"; my($label, @result,@matchingkey); for my $tb (!$tables_ref ? () : @$tables_ref) { my($t) = ref($tb) eq 'REF' ? $$tb : $tb; # allow one level of indirection if (!ref($t) || ref($t) eq 'SCALAR') { # a scalar always matches my($r) = ref($t) ? $$t : $t; # allow direct or indirect reference if (defined $r) { do_log(5,'lookup: (scalar) matches, result="%s"', $r); push(@result,$r); push(@matchingkey,"(constant:$r)"); } } elsif (ref($t) eq 'HASH') { my($r,$mk); ($r,$mk) = lookup_hash($addr,$t,$get_all,%options) if %$t; if (!defined $r) {} elsif (!$get_all) { push(@result,$r); push(@matchingkey,$mk) } elsif (@$r) { push(@result,@$r); push(@matchingkey,@$mk) } } else { die "TROUBLE: lookup table not implemented for object: " . ref($t); } last if @result && !$get_all; } if (!$get_all) { ($result[0], $matchingkey[0]) } else { (\@result, \@matchingkey) } } sub parse_quoted_rfc2821($$) { my($addr,$unquote) = @_; # the angle-bracket stripping is not really a duty of this subroutine, # as it should have been already done elsewhere, but we allow it here anyway: $addr =~ s/^\s*<//s; $addr =~ s/>\s*\z//s; # tolerate unmatched angle brkts local($1,$2); my($source_route,$localpart,$domain) = ('','',''); # RFC 2821: so-called "source route" MUST BE accepted, # SHOULD NOT be generated, and SHOULD be ignored. # Path = "<" [ A-d-l ":" ] Mailbox ">" # A-d-l = At-domain *( "," A-d-l ) # At-domain = "@" domain if (index($addr,':') >= 0 && # triage before more testing for source route $addr =~ m{^ ( [ \t]* \@ (?: [0-9A-Za-z.!\#\$%&*/^{}=_+-]* | \[ (?: \\. | [^\]\\] ){0,999} \] ) [ \t]* (?: , [ \t]* \@ (?: [0-9A-Za-z.!\#\$%&*/^{}=_+-]* | \[ (?: \\. | [^\]\\] ){0,999} \] ) [ \t]* )* : [ \t]* ) (.*) \z }xs) { # NOTE: we are quite liberal on allowing whitespace around , and : here, # and liberal in allowed character set and syntax of domain names, # we mainly avoid stop-characters in the domain names of source route $source_route = $1; $addr = $2; } if ($addr =~ m{^ ( .*? ) ( \@ (?: [^\@\[\]]+ | \[ (?: \\. | [^\]\\] ){0,999} \] | [^\@] )* ) \z}xs) { ($localpart,$domain) = ($1,$2); } else { ($localpart,$domain) = ($addr,''); } $localpart =~ s/ " | \\ (.) | \\ \z /$1/xsg if $unquote; # undo quoted-pairs ($source_route, $localpart, $domain); } sub unquote_rfc2821_local($) { my($mailbox) = @_; my($source_route,$localpart,$domain) = parse_quoted_rfc2821($mailbox,1); # make address with '@' in the localpart but no domain (like <"aa@bb.com"> ) # distinguishable from <aa@bb.com> by representing it as aa@bb.com@ in # unquoted form; (it still obeys all regular rules, it is not a dirty trick) $domain = '@' if $domain eq '' && $localpart ne '' && $localpart =~ /\@/; $localpart . $domain; } # # ====================================================================== # Code above is copied from amavisd; some day it should be factored out. # Code from here on is specific to amavisd-signer. # ====================================================================== # # process a request to choose a signing key; # sub choose_key_request($) { my($attr) = @_; my(@results); my(%sig_options); # signature options, and constraints for choosing a key my(%key_options); # options associated with a signing key my(@tried_domains); # used for logging a failure my($chosen_addr,$chosen_addr_src); my($cand) = $attr->{candidate}; my(@candidates) = !defined $cand ? () : !ref $cand ? $cand : @$cand; my($sobm) = \@dkim_signature_options_bysender_maps; for my $pair (@candidates) { my($addr_src,$addr) = split(' ',$pair,2); $addr = unquote_rfc2821_local($addr); my($addr_localpart,$addr_domain) = split_address($addr); $addr_domain = lc($addr_domain); my($dkim_options_ref,$mk_ref) = lookup2(1,$addr,$sobm); $dkim_options_ref = [] if !defined $dkim_options_ref; #***? # place catchall default(s) at the end of the list of options; push(@$dkim_options_ref, { c => 'relaxed/simple', a => 'rsa-sha256' }); %sig_options = (); # signature options: # (v), a, (b), (bh), c, d, (h), i, (l), q, s, (t), x, (z) # traverse from specific to general, first match wins for my $opts_hash_ref (@$dkim_options_ref) { while (my($k,$v) = each(%$opts_hash_ref)) { $sig_options{$k} = $v if !exists($sig_options{$k}) } } # a default for a signing domain is a domain of each tried address if (!exists($sig_options{d})) { my($d) = $addr_domain; $d =~ s/^\@//; $sig_options{d} = $d } push(@tried_domains, $sig_options{d}); ll(5) && do_log(5, "signature options for %s(%s): %s", $addr,$addr_src, join('; ', map { $_.'='.$sig_options{$_} } keys %sig_options)); # find a private key associated with a signing domain and selector, # and meeting constraints %key_options = get_dkim_key(%sig_options) if defined $sig_options{d} && $sig_options{d} ne ''; my($key) = $key_options{key}; if (defined $key && $key ne '') { # found; copy the key and its options $sig_options{key} = $key; $sig_options{s} = $key_options{selector}; $chosen_addr = $addr; $chosen_addr_src = $addr_src; last; } } # if any signature options were specified in the request and not overruled # by more specific ones here, copy them to the resulting set of sig options for my $opt (keys %$attr) { if ($opt =~ /^sig\.(.+)\z/) { $sig_options{$1} = $attr->{$opt} if !exists($sig_options{$1}); } } ll(5) && do_log(5, "sig options: %s", join('; ', map { $_.'='.$sig_options{$_} } keys %sig_options)); my(%key_options); if (defined $sig_options{d} && $sig_options{d} ne '') { %key_options = get_dkim_key(%sig_options); } do_log(5, "key options: %s is %s", $_, $key_options{$_}) for keys %key_options; my($s) = $key_options{'selector'}; my($d) = $key_options{'domain'}; $sig_options{'s'} = $s; $sig_options{'d'} = $d; delete $sig_options{'key'}; # no use of key ref in the protocol for my $opt (sort keys %sig_options) { if (defined $sig_options{$opt}) { push(@results, proto_encode('sig.'.$opt, $sig_options{$opt})); } } # optional information if available: client may log it, or use for debugging if (defined $chosen_addr_src && defined $chosen_addr) { push(@results, proto_encode('chosen_candidate', $chosen_addr_src, $chosen_addr)); } \@results; } # sign a digest code using the specified algorithm and a private signing key # sub dkim_rsa_sign($$$) { my($digest,$alg_name,$key) = @_; my($result); $digest = '' if !defined $digest; $alg_name = '' if !defined $alg_name; if (defined $key && $key ne '') { my($key) = Mail::DKIM::PrivateKey->load(Cork => $key); $key or die "no key available\n"; $result = $key->sign_digest($alg_name,$digest); } $result; } # process a request to sign the supplied digest with a selected key # # presence of the 'b' attribute in the result indicates success, # otherwise the result is treated as signature unavailable # sub sign_request($) { my($attr) = @_; my(@results, $reason, $sig); my($digest, $digest_alg, $selector, $domain) = @$attr{qw(digest digest_alg s d)}; if (!defined $digest || $digest eq '') { $reason = 'cannot sign, digest not provided, nothing to sign'; } elsif (!defined $digest_alg || $digest_alg eq '') { $reason = 'cannot sign, digest algorithm name not provided'; } elsif (!defined $domain || $domain eq '') { $reason = 'cannot sign, signing domain not provided'; } elsif (!defined $selector || $selector eq '') { $reason = 'cannot sign, selector not provided'; } else { my(%sig_options); # signature options: v, a, c, d, h, i, l, q, s, t, x, z $sig_options{s} = $selector; $sig_options{d} = $domain; my(%key_options) = get_dkim_key(%sig_options); if (!defined $key_options{key}) { $reason = 'cannot sign, signing key not available'; } else { do_log(5, "key options: %s is %s", $_, $key_options{$_}) for keys %key_options; eval { $sig = dkim_rsa_sign(decode_base64($digest), $digest_alg, $key_options{key}); 1; } or do { my($eval_stat) = $@ ne '' ? $@ : "errno=$!"; chomp $eval_stat; do_log(0, "signing failed: %s", $eval_stat); $reason = 'cannot sign: ' . $eval_stat; }; push(@results, proto_encode('d', $key_options{'domain'})); push(@results, proto_encode('s', $key_options{'selector'})); } } if (defined $sig && $sig ne '') { push(@results, proto_encode('b', encode_base64($sig,''))); } else { $reason = 'cannot sign: signing failed' if !defined $reason; push(@results, proto_encode('reason', $reason)); } \@results; } # process the request received from amavisd # sub do_the_request($) { my($attr) = @_; ll(2) && do_log(2, "got: %s", join('; ', map { my($k) = $_; my($v) = $attr->{$k}; map { $k.'='.$_ } (!ref $v ? $v : @$v) } keys %$attr)); my(@results); my($req_id) = $attr->{request_id}; my($log_id) = $attr->{log_id}; push(@results, proto_encode('request_id', $req_id)) if defined $req_id; push(@results, proto_encode('log_id', $log_id)) if defined $log_id; my($request_type) = $attr->{request}; $request_type = '' if !defined $request_type; if ($request_type eq 'choose_key') { push(@results, @{choose_key_request($attr)}); } elsif ($request_type eq 'sign') { push(@results, @{sign_request($attr)}); } else { push(@results, proto_encode('reason', 'unknown request type')); do_log(2, "got: ignoring request: %s", $request_type); } ll(1) && do_log(1, "response: %s", join('; ', @results)); do_log(5, ""); \@results; } # IO::Multiplex -style callback hook # sub mux_connection { my($self,$mux,$fh) = @_; do_log(3, "client %s just connected", $self->{peeraddr}); $self->{attr} = {}; } # the mux_connection callback is guaranteed to have already been run once # sub mux_input { my($self,$mux,$fh,$in_ref) = @_; my $attr = $self->{attr}; do_log(5, "input from %s ready", $self->{peeraddr}); # process each line in the input, leaving partial lines in the input buffer local($1,$2); my($quit) = 0; while ($$in_ref =~ s/^(.*?)\015?\012//) { my($ln) = $1; if ($ln eq '') { # empty line indicates end of a request my($results_ref) = do_the_request($attr); print(join('', map { $_."\015\012" } (@$results_ref,''))) or do_log(0,"mux_input: error writing a response to socket" ); %$attr = (); # reset, awaiting next request in the same session } elsif ($ln =~ /^ ([^=\000\012]*?) (?: = | : [ \t]* ) (.*) \z/xsi) { my($attr_name) = proto_decode($1); my($attr_val) = proto_decode($2); if (!exists $attr->{$attr_name}) { $attr->{$attr_name} = $attr_val; # simple scalar for one-time attrs } elsif (!ref($attr->{$attr_name})) { # multiple, convert to a list $attr->{$attr_name} = [ $attr->{$attr_name}, $attr_val ]; } else { # append to a list of same-name attributes push(@{$attr->{$attr_name}}, $attr_val); } } else { do_log(0, "mux_input: ignored line: %s", $ln); } } close(STDOUT) if $quit; } # # Main program starts here (after initializations near the top of this file) # @daemon_groups = Amavis::Util::get_user_groups($daemon_user) if not @daemon_groups; dkim_key_postprocess(); # set up a Net::Server configuration $server = AmavisSigner->new({ # limit socket bind (e.g. to the loopback interface) host => (!defined $inet_socket_bind || $inet_socket_bind eq '' ? '*' : $inet_socket_bind), port => \@listen_sockets, # listen on these sockets (Unix or inet) listen => $listen_queue_size, # undef for a default user => ($> == 0 || $< == 0) ? $daemon_user : undef, group => (($> == 0 || $< == 0) && @daemon_groups) ? "@daemon_groups" : undef, background => $daemonize ? 1 : undef, setsid => $daemonize ? 1 : undef, chroot => $daemon_chroot_dir ne '' ? $daemon_chroot_dir : undef, pid_file => $pid_file, log_file => $daemonize ? 'Sys::Syslog' : undef, syslog_ident => $syslog_ident, syslog_facility => $syslog_facility, syslog_logsock => 'native', # 0=err, 1=warning, 2=notice, 3=info, 4=debug log_level => $log_level >= 5 ? 4 : 2, }); $server->run; # transferring control to Net::Server exit 1; # shouldn't get here # TODO: pkcs11 URI # In order to use a key an application needs the path to the PKCS11 lib, # the key ID, username, pin and the slot number # # http://blogs.sun.com/janp/entry/pkcs_11_engine_patch_including # pkcs11:[object=<label>] # object (key) label, eg. "mykey" # [;token=<label>] # token label # [;manuf=<label>] # manufacturer ID # [;serial=<label>] # serial number of the token # [;model=<label>] # token model # [;objecttype=(public|private|cert|data)] # [;passphrasedialog=(builtin|exec:<file>)] # # alternative: # pkcs11:///path/to/pkcs11/lib?slot=0&id=123 # file:///path/to/pem/file # # SEE: http://blog.nominet.org.uk/tech/category/crypto/