From 1af3c572eedb0eaddcdc5c9c41d98ff59bb7b2c9 Mon Sep 17 00:00:00 2001
From: Guilhem Moulin <guilhem@fripost.org>
Date: Tue, 24 May 2016 17:11:11 +0200
Subject: IPSec: replace (self-signed) X.509 certs by their raw pubkey for
 authentication.

There is no need to bother with X.509 cruft here.
---
 roles/common/files/usr/local/bin/genkeypair.sh |  5 ++++-
 roles/common/tasks/ipsec.yml                   | 17 ++++++++---------
 roles/common/templates/etc/ipsec.conf.j2       |  5 +++--
 3 files changed, 15 insertions(+), 12 deletions(-)

(limited to 'roles/common')

diff --git a/roles/common/files/usr/local/bin/genkeypair.sh b/roles/common/files/usr/local/bin/genkeypair.sh
index 45e2181..01b279a 100755
--- a/roles/common/files/usr/local/bin/genkeypair.sh
+++ b/roles/common/files/usr/local/bin/genkeypair.sh
@@ -47,6 +47,7 @@ usage() {
 		    x509:       generate a self-signed X.509 server certificate
 		    csr:        generate a Certificate Signing Request
 		    dkim:       generate a private key (to use for DKIM signing)
+		    keypair:    generate a key pair
 
 		Options:
 		    -t type:    key type (default: rsa)
@@ -88,7 +89,7 @@ dkiminfo() {
 [ $# -gt 0 ] || { usage; exit 2; }
 cmd="$1"; shift
 case "$cmd" in
-    x509|csr|dkim) ;;
+    x509|csr|dkim|keypair) ;;
     *) echo "Unrecognized command: $cmd" >&2; exit 2
 esac
 
@@ -201,4 +202,6 @@ elif [ "$cmd" = x509 -o "$cmd" = csr ]; then
         [ "$cmd" = x509 ] && x509=-x509 || x509=
         openssl req -config "$config" -new $x509 ${hash:+-$hash} -days 3650 -key "$privkey" >"$pubkey" || exit 2
     fi
+elif [ "$cmd" = keypair -a "$pubkey" ]; then
+    openssl pkey -pubout <"$privkey" >"$pubkey"
 fi
diff --git a/roles/common/tasks/ipsec.yml b/roles/common/tasks/ipsec.yml
index b82c281..ca03c98 100644
--- a/roles/common/tasks/ipsec.yml
+++ b/roles/common/tasks/ipsec.yml
@@ -54,12 +54,11 @@
   notify:
     - Restart IPSec
 
-- name: Generate a private key and a X.509 certificate for IPSec
-  command: genkeypair.sh x509
+- name: Generate a key pair for IPSec public key authentication
+  command: genkeypair.sh keypair
                          --pubkey=/etc/ipsec.d/certs/{{ inventory_hostname_short }}.pem
                          --privkey=/etc/ipsec.d/private/{{ inventory_hostname_short }}.key
-                         --ou=IPSec --cn={{ inventory_hostname_short }}
-                         -t rsa -b 4096 -h sha512
+                         -t rsa -b 4096
   register: r4
   changed_when: r4.rc == 0
   failed_when: r4.rc > 1
@@ -68,18 +67,18 @@
   tags:
     - genkey
 
-- name: Fetch IPSec X.509 certificate
+- name: Fetch the public part of IPSec host key
   # Ensure we don't fetch private data
   become: False
-  fetch_cmd: cmd="openssl x509"
-             stdin=/etc/ipsec.d/certs/{{ inventory_hostname_short }}.pem
-             dest=certs/ipsec/{{ inventory_hostname_short }}.pem
+  fetch: src=/etc/ipsec.d/certs/{{ inventory_hostname_short }}.pem
+         dest=certs/ipsec/{{ inventory_hostname_short }}.pem
+         fail_on_missing=yes flat=yes
   tags:
     - genkey
 
 # Don't copy our pubkey due to a possible race condition.  Only the
 # remote machine has authority regarding its key.
-- name: Copy IPSec X.509 certificates (except ours)
+- name: Copy the public part of IPSec peers' key
   copy: src=certs/ipsec/{{ hostvars[item].inventory_hostname_short }}.pem
         dest=/etc/ipsec.d/certs/{{ hostvars[item].inventory_hostname_short }}.pem
         owner=root group=root
diff --git a/roles/common/templates/etc/ipsec.conf.j2 b/roles/common/templates/etc/ipsec.conf.j2
index 4d6aa68..938f6b8 100644
--- a/roles/common/templates/etc/ipsec.conf.j2
+++ b/roles/common/templates/etc/ipsec.conf.j2
@@ -18,7 +18,8 @@ conn %default
     leftauth       = pubkey
     left           = %defaultroute
     leftsubnet     = {{ ipsec[inventory_hostname_short] | ipv4 }}/32
-    leftcert       = {{ inventory_hostname_short }}.pem
+    leftid         = {{ inventory_hostname }}
+    leftsigkey     = {{ inventory_hostname_short }}.pem
     leftfirewall   = yes
     lefthostaccess = yes
     rightauth      = pubkey
@@ -34,7 +35,7 @@ conn {{ hostvars[host].inventory_hostname_short }}
 {% if 'DynDNS' in hostvars[host].group_names %}
     rightallowany = yes
 {% endif %}
-    rightcert     = {{ hostvars[host].inventory_hostname_short }}.pem
+    rightsigkey   = {{ hostvars[host].inventory_hostname_short }}.pem
     rightsubnet   = {{ ipsec[ hostvars[host].inventory_hostname_short ] | ipv4 }}/32
 {% if 'NATed' not in group_names and 'NATed' in hostvars[host].group_names %}
     mobike        = yes
-- 
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