Route SMTP traffic from the webmail through IPsec.

10 files changed, 44 insertions, 124 deletions

diff --git a/group_vars/all.yml b/group_vars/all.yml
index a9bfda9..96f723b 100644
--- a/group_vars/all.yml
+++ b/group_vars/all.yml
@@ -1,15 +1,4 @@
 ---
-postfix_instance:
-  # The keys are the group names associated with a Postfix role, and the
-  # values are the name and group (optional) of the instance dedicated
-  # to that role.
-  IMAP:    { name: mda,             port: 2526 }
-  MX:      { name: mx,  group: mta             }
-  out:     { name: out, group: mta, port: 2525 }
-  MSA:     { name: msa                         }
-  lists:   { name: lists,           port: 2527 }
-
-
 # Virtual (non-routable) IPv4 subnet for IPsec.  It is always nullrouted
 # in the absence of xfrm lookup (i.e., when there is no matching IPsec
 # Security Association) to avoid data leaks.
@@ -23,3 +12,30 @@ ipsec:
   elefant:  172.16.0.4
   giraff:   172.16.0.5
   mistral:  172.16.0.6
+
+
+postfix_instance:
+  # The keys are the group names associated with a Postfix role, and the
+  # values are the name and group (optional) of the instance dedicated
+  # to that role.
+  # For internal services, we also specify its (non-routable) IP address
+  # and port.
+  # XXX it's unfortunate that we can only specify a single address, and
+  #     therefore have to limit the number of outgoing SMTP proxy and
+  #     IMAP server to one. Since hosts(5) files cannot map and IP
+  #     address to multiple hostnames, a workaround would be to use
+  #     round-robin DNS, but we can't rely on DNS as long as our zone is
+  #     unsigned.
+  IMAP:    { name: mda
+           , addr: "{{ (groups.all | length > 1) | ternary( ipsec[ hostvars[groups.IMAP[0]].inventory_hostname_short ], '127.0.0.1') }}"
+           , port: 2526 }
+  MX:      { name: mx,  group: mta }
+  out:     { name: out, group: mta
+           , addr: "{{ (groups.all | length > 1) | ternary( ipsec[ hostvars[groups.out[0]].inventory_hostname_short ], '127.0.0.1') }}"
+           , port: 2525 }
+  MSA:     { name: msa }
+  lists:   { name: lists
+           , addr: "{{ (groups.all | length > 1) | ternary( ipsec[ hostvars[groups.lists[0]].inventory_hostname_short ], '127.0.0.1') }}"
+           , port: 2527 }
+
+imapsvr_addr: "{{ postfix_instance.IMAP.addr | ipaddr }}"
diff --git a/roles/common/tasks/main.yml b/roles/common/tasks/main.yml
index e419bf3..2fe7a0e 100644
--- a/roles/common/tasks/main.yml
+++ b/roles/common/tasks/main.yml
@@ -15,7 +15,7 @@
 
 - include: stunnel.yml
   tags: stunnel
-  when: "'webmail' in group_names and ('LDAP-provider' not in group_names or 'out' not in group_names)"
+  when: "'webmail' in group_names and 'LDAP-provider' not in group_names"
 - include: samhain.yml
   tags: samhain
 - include: auditd.yml
diff --git a/roles/out/templates/etc/postfix/main.cf.j2 b/roles/out/templates/etc/postfix/main.cf.j2
index ddd46d5..34ac84e 100644
--- a/roles/out/templates/etc/postfix/main.cf.j2
+++ b/roles/out/templates/etc/postfix/main.cf.j2
@@ -27,8 +27,11 @@ multi_instance_group  = {{ postfix_instance[inst].group | default('') }}
 multi_instance_name   = postfix-{{ postfix_instance[inst].name }}
 multi_instance_enable = yes
 
-mynetworks_style = host
-inet_interfaces  = all
+mynetworks      = 127.0.0.0/8, [::1]/128
+{%- if groups.all | length > 1 -%}
+                , {{ ipsec_subnet }}
+{% endif %}
+inet_interfaces = all
 
 # No local delivery
 mydestination        =
diff --git a/roles/webmail/handlers/main.yml b/roles/webmail/handlers/main.yml
index 17a0dc4..d02cdda 100644
--- a/roles/webmail/handlers/main.yml
+++ b/roles/webmail/handlers/main.yml
@@ -1,7 +1,4 @@
 ---
-- name: Restart stunnel@smtp
-  service: name=stunnel4@smtp state=restarted
-
 - name: Restart stunnel@ldap
   service: name=stunnel4@ldap state=restarted
 
diff --git a/roles/webmail/tasks/mail.yml b/roles/webmail/tasks/mail.yml
deleted file mode 100644
index 78eee38..0000000
--- a/roles/webmail/tasks/mail.yml
+++ /dev/null
@@ -1,32 +0,0 @@
-- name: Create /etc/stunnel/certs
-  file: path=/etc/stunnel/certs
-        state=directory
-        owner=root group=root
-        mode=0755
-
-- name: Copy the SMTP outgoing proxy's X.509 certificate
-  assemble: src=certs/postfix regexp="{{ groups.out | difference([inventory_hostname]) | join('|') }}\.pem$" remote_src=no
-            dest=/etc/stunnel/certs/smtp.pem
-            owner=root group=root
-            mode=0644
-  register: r1
-  notify:
-    - Restart stunnel@smtp
-
-- name: Configure stunnel
-  template: src=etc/stunnel/smtp.conf.j2
-            dest=/etc/stunnel/smtp.conf
-            owner=root group=root
-            mode=0644
-  register: r2
-  notify:
-    - Restart stunnel@smtp
-
-- name: Enable stunnel@smtp
-  service: name=stunnel4@smtp enabled=yes
-
-- name: Start stunnel@smtp
-  service: name=stunnel4@smtp state=started
-  when: not (r1.changed or r2.changed)
-
-- meta: flush_handlers
diff --git a/roles/webmail/tasks/main.yml b/roles/webmail/tasks/main.yml
index 9c40a34..cd9f0c7 100644
--- a/roles/webmail/tasks/main.yml
+++ b/roles/webmail/tasks/main.yml
@@ -1,9 +1,3 @@
-- include: mail.yml
-  when: "'out' not in group_names"
-  tags:
-    - postfix
-    - mail
-    - stunnel
 - include: ldap.yml
   when: "'LDAP-provider' not in group_names"
   tags:
diff --git a/roles/webmail/tasks/roundcube.yml b/roles/webmail/tasks/roundcube.yml
index 41ef907..d1fb8a2 100644
--- a/roles/webmail/tasks/roundcube.yml
+++ b/roles/webmail/tasks/roundcube.yml
@@ -49,16 +49,16 @@
     # IMAP
     #   WARNING: After hostname change update of mail_host column in users
     #   table is required to match old user data records with the new host.
-    - { var: default_host,           value: "'{{ ipsec[imapsvr.inventory_hostname_short] }}'" }
-    - { var: default_port,           value: "143"                                             }
-    - { var: imap_auth_type,         value: "'PLAIN'"                                         }
-    - { var: imap_cache,             value: "null"                                            }
-    - { var: imap_timeout,           value: "180"                                             }
-    - { var: imap_force_ns,          value: "true"                                            }
-    - { var: messages_cache,         value: "false"                                           }
+    - { var: default_host,           value: "'{{ imapsvr_addr | ipaddr }}'" }
+    - { var: default_port,           value: "143"                           }
+    - { var: imap_auth_type,         value: "'PLAIN'"                       }
+    - { var: imap_cache,             value: "null"                          }
+    - { var: imap_timeout,           value: "180"                           }
+    - { var: imap_force_ns,          value: "true"                          }
+    - { var: messages_cache,         value: "false"                         }
     # SMTP
-    - { var: smtp_server,            value: "'localhost'" }
-    - { var: smtp_port,              value: "2525"        }
+    - { var: smtp_server,            value: "'{{ postfix_instance.out.addr | ipaddr }}'" }
+    - { var: smtp_port,              value:  "{{ postfix_instance.out.port          }}"  }
     # System
     - { var: force_https,            value: "true"                       }
     - { var: login_autocomplete,     value: "2"                          }
diff --git a/roles/webmail/templates/etc/roundcube/plugins/managesieve/config.inc.php.j2 b/roles/webmail/templates/etc/roundcube/plugins/managesieve/config.inc.php.j2
index dcaca06..66af466 100644
--- a/roles/webmail/templates/etc/roundcube/plugins/managesieve/config.inc.php.j2
+++ b/roles/webmail/templates/etc/roundcube/plugins/managesieve/config.inc.php.j2
@@ -10,7 +10,7 @@ $config['managesieve_port'] = 4190;
 // %n - http hostname ($_SERVER['SERVER_NAME'])
 // %d - domain (http hostname without the first part)
 // For example %n = mail.domain.tld, %d = domain.tld
-$config['managesieve_host'] = '{{ ipsec[imapsvr.inventory_hostname_short] }}';
+$config['managesieve_host'] = '{{ imapsvr_addr | ipaddr }}';
 
 // authentication method. Can be CRAM-MD5, DIGEST-MD5, PLAIN, LOGIN, EXTERNAL
 // or none. Optional, defaults to best method supported by server.
diff --git a/roles/webmail/templates/etc/stunnel/smtp.conf.j2 b/roles/webmail/templates/etc/stunnel/smtp.conf.j2
deleted file mode 100644
index ba38bfa..0000000
--- a/roles/webmail/templates/etc/stunnel/smtp.conf.j2
+++ /dev/null
@@ -1,58 +0,0 @@
-; **************************************************************************
-; * Global options                                                         *
-; **************************************************************************
-
-; setuid()/setgid() to the specified user/group in daemon mode
-setuid = stunnel4
-setgid = stunnel4
-
-; PID is created inside the chroot jail
-pid =
-foreground = yes
-
-; Only log messages at severity warning (4) and higher
-debug = 4
-
-; **************************************************************************
-; * Service defaults may also be specified in individual service sections  *
-; **************************************************************************
-
-; Certificate/key is needed in server mode and optional in client mode
-cert = /etc/postfix/ssl/{{ ansible_fqdn }}.pem
-key  = /etc/postfix/ssl/{{ ansible_fqdn }}.key
-client = yes
-socket = a:SO_BINDTODEVICE=lo
-
-; Some performance tunings
-socket = l:TCP_NODELAY=1
-socket = r:TCP_NODELAY=1
-
-; Prevent MITM attacks
-verify = 4
-
-; Disable support for insecure protocols
-options = NO_SSLv2
-options = NO_SSLv3
-options = NO_TLSv1
-options = NO_TLSv1.1
-
-options = NO_COMPRESSION
-
-; These options provide additional security at some performance degradation
-options = SINGLE_ECDH_USE
-options = SINGLE_DH_USE
-
-; Select permitted SSL ciphers
-ciphers = EECDH+AESGCM:!MEDIUM:!LOW:!EXP:!aNULL:!eNULL
-
-; **************************************************************************
-; * Service definitions (remove all services for inetd mode)               *
-; **************************************************************************
-
-[smtp]
-accept   = localhost:2525
-connect  = outgoing.fripost.org:{{ postfix_instance.out.port }}
-CAfile   = /etc/stunnel/certs/smtp.pem
-protocol = smtp
-
-; vim:ft=dosini
diff --git a/webmail.yml b/webmail.yml
index cd5100f..0ef0487 100644
--- a/webmail.yml
+++ b/webmail.yml
@@ -2,4 +2,4 @@
 - name: Configure the webmail
   hosts: webmail
   roles:
-    - { role: webmail, imapsvr: "{{ hostvars[groups.IMAP[0]] }}" }
+    - webmail