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-rw-r--r--roles/MSA/etc/systemd/system/postfix-sender-login.service23
-rw-r--r--roles/MSA/etc/systemd/system/postfix-sender-login.socket8
-rwxr-xr-xroles/MSA/files/usr/local/bin/postfix-sender-login.pl171
-rw-r--r--roles/MSA/handlers/main.yml3
-rw-r--r--roles/MSA/tasks/main.yml22
-rw-r--r--roles/MSA/templates/etc/postfix/main.cf.j22
-rw-r--r--roles/common-LDAP/templates/etc/default/slapd.j22
-rw-r--r--roles/common-LDAP/templates/etc/ldap/database.ldif.j217
-rw-r--r--roles/common/templates/etc/postfix/master.cf.j27
-rw-r--r--roles/webmail/tasks/roundcube.yml7
10 files changed, 257 insertions, 5 deletions
diff --git a/roles/MSA/etc/systemd/system/postfix-sender-login.service b/roles/MSA/etc/systemd/system/postfix-sender-login.service
new file mode 100644
index 0000000..3ceb310
--- /dev/null
+++ b/roles/MSA/etc/systemd/system/postfix-sender-login.service
@@ -0,0 +1,23 @@
+[Unit]
+Description=Postfix sender login socketmap
+After=mail-transport-agent.target
+Requires=postfix-sender-login.socket
+
+[Service]
+User=postfix
+Group=postfix
+StandardInput=null
+SyslogFacility=mail
+ExecStart=/usr/local/bin/postfix-sender-login.pl
+
+# Hardening
+NoNewPrivileges=yes
+PrivateDevices=yes
+ProtectHome=yes
+ProtectSystem=full
+ReadOnlyDirectories=/
+RestrictAddressFamilies=AF_UNIX
+
+[Install]
+WantedBy=multi-user.target
+Also=postfix-sender-login.socket
diff --git a/roles/MSA/etc/systemd/system/postfix-sender-login.socket b/roles/MSA/etc/systemd/system/postfix-sender-login.socket
new file mode 100644
index 0000000..c883dc1
--- /dev/null
+++ b/roles/MSA/etc/systemd/system/postfix-sender-login.socket
@@ -0,0 +1,8 @@
+[Socket]
+SocketUser=postfix
+SocketGroup=postfix
+SocketMode=0666
+ListenStream=/var/spool/postfix-msa/private/sender-login
+
+[Install]
+WantedBy=sockets.target
diff --git a/roles/MSA/files/usr/local/bin/postfix-sender-login.pl b/roles/MSA/files/usr/local/bin/postfix-sender-login.pl
new file mode 100755
index 0000000..58cbf9d
--- /dev/null
+++ b/roles/MSA/files/usr/local/bin/postfix-sender-login.pl
@@ -0,0 +1,171 @@
+#!/usr/bin/perl -T
+
+#----------------------------------------------------------------------
+# socketmap lookup table returning the SASL login name(s) owning a given
+# sender address
+# Copyright © 2017 Guilhem Moulin <guilhem@fripost.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#----------------------------------------------------------------------
+
+use warnings;
+use strict;
+
+use Errno 'EINTR';
+use Socket qw/PF_UNIX SOCK_STREAM SHUT_RDWR/;
+
+use Net::LDAPI ();
+use Net::LDAP::Util qw/ldap_explode_dn escape_dn_value escape_filter_value/;
+use Net::LDAP::Constant qw/LDAP_NO_SUCH_OBJECT/;
+use Authen::SASL ();
+
+# clean up PATH
+$ENV{PATH} = join ':', qw{/usr/bin /bin};
+delete @ENV{qw/IFS CDPATH ENV BASH_ENV/};
+
+# returned for forbidden envelope sender addresses
+my $POSTMASTER = 'postmaster@fripost.org';
+
+# fdopen(3) the file descriptor FD
+die "This service must be socket-activated.\n"
+ unless defined $ENV{LISTEN_PID} and $ENV{LISTEN_PID} == $$
+ and defined $ENV{LISTEN_FDS} and $ENV{LISTEN_FDS} == 1;
+open my $S, '+<&=', 3 or die "fdopen: $!";
+
+my $BASEDN = 'ou=virtual,dc=fripost,dc=org';
+my $BUFSIZE = 65536; # try to read that many bytes at the time
+my $LDAPI = 'ldapi://%2Fvar%2Fspool%2Fpostfix-msa%2Fprivate%2Fldapi/';
+sub process_request($);
+
+while(1) {
+ accept(my $conn, $S) or do {
+ # try again if accept(2) was interrupted by a signal
+ next if $! == EINTR;
+ die "accept: $!";
+ };
+ my $reply = process_request($conn);
+
+ # encode the reply as a netstring and send it back
+ # https://cr.yp.to/proto/netstrings.txt
+ $reply = length($reply).':'.$reply.',';
+ my $len = length($reply);
+
+ for (my $i = 0; $i < $len;) {
+ my $n = syswrite($conn, $reply, $len-$i, $i) // do {
+ warn "Can't write: $!";
+ last;
+ };
+ $i += $n;
+ }
+ close $conn or warn "Can't close: $!";
+}
+
+#############################################################################
+
+sub process_request($) {
+ my $conn = shift;
+ my ($buf, $offset) = (undef, 0);
+
+ # keep reading until the request length is determined
+ do {
+ my $n = sysread($conn, $buf, $BUFSIZE, $offset) // return "TEMP can't read: $!";
+ return "TEMP EOF" if $n == 0;
+ $offset += $n;
+ } until ($buf =~ /\A(0|[1-9][0-9]*):/);
+
+ # keep reading until the whole request is buffered
+ my $strlen = length("$1") + 1; # [len]":"
+ my $len = $strlen + $1 + 1; # [len]":"[string]","
+ while ($offset < $len) {
+ my $n = sysread($conn, $buf, $BUFSIZE, $offset) // return "TEMP can't read: $!";
+ return "TEMP EOF" if $n == 0;
+ $offset += $n;
+ }
+
+ # requests are of the form $name <space> $key, cf. socketmap_table(5)
+ my $i = index($buf, ' ', $strlen);
+ return "TEMP invalid input: $buf" unless $i > $strlen and substr($buf,-1) eq ',';
+ my $name = substr($buf, $strlen, $i-$strlen);
+ my $key = substr($buf, $i, -1);
+ return "TEMP invalid name: $name" unless $name eq 'sender_login';
+
+ $key =~ /\A(.+)@([^\@]+)\z/ or return "NOTFOUND "; # invalid sender address
+ my ($localpart, $domainpart) = ($1, $2);
+
+ my $ldap = Net::LDAPI::->new( $LDAPI )
+ // return "TEMP couldn't create Net::LDAPI object";
+ $ldap->bind( undef, sasl => Authen::SASL::->new(mechanism => 'EXTERNAL') )
+ or return "TEMP LDAP: couldn't bind";
+
+ my $reply = lookup_sender($ldap, $localpart, $domainpart);
+ $ldap->unbind();
+ return $reply;
+}
+
+sub lookup_sender($$$) {
+ my ($ldap, $l, $d) = @_;
+
+ my $filter = '(&(objectClass=FripostVirtualDomain)(fvd='.escape_filter_value($d).'))';
+ my $mesg = $ldap->search( base => $BASEDN, scope => 'one', deref => 'never'
+ , filter => $filter
+ , attrs => [qw/objectClass fripostOwner fripostPostmaster/]
+ );
+ return "TEMP LDAP error: ".$mesg->error() if $mesg->code;
+ my $entry = $mesg->pop_entry() // return "NOTFOUND "; # not a domain we know
+ return "TEMP LDAP error: multiple entry founds" if defined $mesg->pop_entry(); # sanity check
+
+ # domain postmasters are allowed to use any sender address
+ my @logins = $entry->get_value('fripostPostmaster', asref => 0);
+ my @owners = $entry->get_value('fripostOwner', asref => 0);
+
+ if (grep { $_ eq 'FripostVirtualAliasDomain' } $entry->get_value('objectClass', asref => 0)) {
+ # so are alias domain owners
+ push @logins, @owners;
+ } else {
+ my $dn = 'fvd='.escape_dn_value($d).','.$BASEDN;
+ my $filter = '(&(|(objectClass=FripostVirtualAlias)(objectClass=FripostVirtualList)(objectClass=FripostVirtualUser))(fvl='.escape_filter_value($l).'))';
+ my $mesg = $ldap->search( base => $dn, scope => 'one', deref => 'never'
+ , filter => $filter
+ , attrs => [qw/objectClass fripostOwner/]
+ );
+ unless ($mesg->code == 0 and defined ($entry = $mesg->pop_entry())) {
+ # domains owners are allowed to use any unkwown localpart as sender address
+ push @logins, @owners;
+ } else {
+ return "TEMP LDAP error: multiple entry founds" if defined $mesg->pop_entry(); # sanity check
+ if (grep { $_ eq 'FripostVirtualUser' } $entry->get_value('objectClass', asref => 0)) {
+ push @logins, $entry->dn();
+ } else {
+ # alias/list owners can use the address as sender, and so are the domains owners
+ push @logins, @owners, $entry->get_value('fripostOwner', asref => 0);
+ }
+ }
+ }
+
+ # convert DNs to SASL login names
+ my %logins;
+ foreach my $dn (@logins) {
+ next unless defined $dn;
+ $dn = ldap_explode_dn($dn, casefold => 'lower');
+ next unless defined $dn and $#$dn == 4;
+ my $l = $dn->[0]->{fvl} // next;
+ my $d = $dn->[1]->{fvd} // next;
+ $logins{$l.'@'.$d} = 1;
+ }
+
+ # if the entry is found in LDAP but doesn't have an owner, only
+ # $POSTMASTER is allowed to use it as sender address
+ my $reply = %logins ? join(',', keys %logins) : $POSTMASTER;
+ return "OK $reply";
+}
diff --git a/roles/MSA/handlers/main.yml b/roles/MSA/handlers/main.yml
index 9edf610..a3db0f8 100644
--- a/roles/MSA/handlers/main.yml
+++ b/roles/MSA/handlers/main.yml
@@ -1,4 +1,7 @@
---
+- name: systemctl daemon-reload
+ command: /bin/systemctl daemon-reload
+
- name: Reload Postfix
service: name=postfix state=reloaded
diff --git a/roles/MSA/tasks/main.yml b/roles/MSA/tasks/main.yml
index 6eff2cf..00c205d 100644
--- a/roles/MSA/tasks/main.yml
+++ b/roles/MSA/tasks/main.yml
@@ -4,6 +4,28 @@
- postfix
- postfix-pcre
+- name: Copy Postfix sender login socketmap
+ copy: src=usr/local/bin/postfix-sender-login.pl
+ dest=/usr/local/bin/postfix-sender-login.pl
+ owner=root group=staff
+ mode=0755
+
+- name: Copy Postfix sender login socketmap systemd unit files
+ copy: src=etc/systemd/system/{{ item }}
+ dest=/etc/systemd/system/{{ item }}
+ owner=root group=root
+ mode=0644
+ with_items:
+ - postfix-sender-login.service
+ - postfix-sender-login.socket
+ notify:
+ - systemctl daemon-reload
+
+- meta: flush_handlers
+
+- name: Enable Postfix sender login socketmap
+ service: name=postfix-sender-login.socket state=started enabled=yes
+
- name: Configure Postfix
template: src=etc/postfix/{{ item }}.j2
dest=/etc/postfix-{{ postfix_instance[inst].name }}/{{ item }}
diff --git a/roles/MSA/templates/etc/postfix/main.cf.j2 b/roles/MSA/templates/etc/postfix/main.cf.j2
index f5f0834..ec6b242 100644
--- a/roles/MSA/templates/etc/postfix/main.cf.j2
+++ b/roles/MSA/templates/etc/postfix/main.cf.j2
@@ -93,10 +93,12 @@ smtpd_helo_required = yes
smtpd_helo_restrictions =
reject_invalid_helo_hostname
+smtpd_sender_login_maps = socketmap:unix:private/sender-login:sender_login
smtpd_sender_restrictions =
reject_non_fqdn_sender
reject_unknown_sender_domain
check_sender_access cdb:$config_directory/check_sender_access
+ reject_known_sender_login_mismatch
smtpd_relay_restrictions =
reject_non_fqdn_recipient
diff --git a/roles/common-LDAP/templates/etc/default/slapd.j2 b/roles/common-LDAP/templates/etc/default/slapd.j2
index 80c1be1..fdd7481 100644
--- a/roles/common-LDAP/templates/etc/default/slapd.j2
+++ b/roles/common-LDAP/templates/etc/default/slapd.j2
@@ -20,7 +20,7 @@ SLAPD_PIDFILE=
# service requests on TCP-port 636 (ldaps) and requests via unix
# sockets.
SLAPD_SERVICES="ldapi:///"
-{% for i in group_names | intersect(['MX','lists']) | sort %}
+{% for i in group_names | intersect(['MX','lists','MSA']) | sort %}
SLAPD_SERVICES="$SLAPD_SERVICES ldapi://%2Fvar%2Fspool%2Fpostfix-{{ postfix_instance[i].name }}%2Fprivate%2Fldapi/"
{% endfor %}
{% if 'LDAP-provider' in group_names %}
diff --git a/roles/common-LDAP/templates/etc/ldap/database.ldif.j2 b/roles/common-LDAP/templates/etc/ldap/database.ldif.j2
index 8310818..494888e 100644
--- a/roles/common-LDAP/templates/etc/ldap/database.ldif.j2
+++ b/roles/common-LDAP/templates/etc/ldap/database.ldif.j2
@@ -258,7 +258,7 @@ olcAccess: to dn.exact="ou=virtual,dc=fripost,dc=org"
{% if 'MDA' in group_names -%}
by dn.exact="username=dovecot,cn=peercred,cn=external,cn=auth" sockurl.regex="^ldapi://" =sd
{% endif -%}
- {% if 'MX' in group_names -%}
+ {% if 'MX' in group_names or 'MSA' in group_names -%}
by dn.exact="username=postfix,cn=peercred,cn=external,cn=auth" sockurl.regex="^ldapi://%2Fvar%2Fspool%2Fpostfix-[-[:alnum:]]+%2Fprivate%2F" =sd
{% endif -%}
by users =0 break
@@ -476,6 +476,21 @@ olcAccess: to dn.regex="^fvl=[^,]+,fvd=[^,]+,ou=virtual,dc=fripost,dc=org$"
{% endif -%}
by users =0 break
{% endif %}
+#
+# * The MSA's postfix user can read entry ownership to dermine the SASL
+# login name(s) owning a given sender address
+{% if 'MSA' in group_names %}
+olcAccess: to dn.regex="^fvd=[^,]+,ou=virtual,dc=fripost,dc=org$"
+ attrs=fripostOwner,fripostPostmaster
+ filter=(|(objectClass=FripostVirtualAliasDomain)(objectClass=FripostVirtualDomain))
+ by dn.exact="username=postfix,cn=peercred,cn=external,cn=auth" sockurl.regex="^ldapi://%2Fvar%2Fspool%2Fpostfix-[-[:alnum:]]+%2Fprivate%2F" =rsd
+ by users =0 break
+olcAccess: to dn.regex="^fvl=[^,]+,fvd=[^,]+,ou=virtual,dc=fripost,dc=org$"
+ attrs=entry,objectClass,fvl,fripostOwner
+ filter=(|(objectClass=FripostVirtualAlias)(objectClass=FripostVirtualList)(objectClass=FripostVirtualUser))
+ by dn.exact="username=postfix,cn=peercred,cn=external,cn=auth" sockurl.regex="^ldapi://%2Fvar%2Fspool%2Fpostfix-[-[:alnum:]]+%2Fprivate%2F" =rsd
+ by users =0 break
+{% endif %}
{% if 'LDAP-provider' in group_names %}
#
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
diff --git a/roles/common/templates/etc/postfix/master.cf.j2 b/roles/common/templates/etc/postfix/master.cf.j2
index c2ee395..52b2ec4 100644
--- a/roles/common/templates/etc/postfix/master.cf.j2
+++ b/roles/common/templates/etc/postfix/master.cf.j2
@@ -20,8 +20,13 @@ tlsproxy unix - - n - 0 tlsproxy
dnsblog unix - - n - 0 dnsblog
cleanup_nochroot unix n - n - 0 cleanup
{% elif inst == 'MSA' %}
-{{ postfix_instance.MSA.port }} inet n - - - - smtpd
+submission inet n - - - - smtpd
-o tls_high_cipherlist=EECDH+AESGCM:!MEDIUM:!LOW:!EXP:!aNULL:!eNULL
+{% if groups.webmail | difference([inventory_hostname]) | length > 0 %}
+[{{ postfix_instance.MSA.addr }}]:{{ postfix_instance.MSA.port }} inet n - - - - smtpd
+ -o smtpd_tls_security_level=none
+ -o smtpd_sasl_security_options=noanonymous
+{% endif %}
{% elif inst in ['IMAP', 'out', 'lists'] %}
[{{ postfix_instance[inst].addr }}]:{{ postfix_instance[inst].port }} inet n - - - - smtpd
{% endif %}
diff --git a/roles/webmail/tasks/roundcube.yml b/roles/webmail/tasks/roundcube.yml
index 4c7ac8d..5f41ba0 100644
--- a/roles/webmail/tasks/roundcube.yml
+++ b/roles/webmail/tasks/roundcube.yml
@@ -83,8 +83,11 @@
- { var: imap_force_ns, value: "true" }
- { var: messages_cache, value: "false" }
# SMTP
- - { var: smtp_server, value: "'{{ postfix_instance.out.addr | ipaddr }}'" }
- - { var: smtp_port, value: "{{ postfix_instance.out.port }}" }
+ - { var: smtp_server, value: "'{{ postfix_instance.MSA.addr | ipaddr }}'" }
+ - { var: smtp_port, value: "{{ postfix_instance.MSA.port }}" }
+ - { var: smtp_auth_type, value: "'PLAIN'" }
+ - { var: smtp_user, value: "'%u'" }
+ - { var: smtp_pass, value: "'%p'" }
# System
- { var: force_https, value: "true" }
- { var: login_autocomplete, value: "2" }
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 02:25:00 +0000