X-Git-Url: https://iankelling.org/git/?a=blobdiff_plain;f=vpn-mk-client-cert;h=59ddda55cc5cc5959d2d68273d85f7ae5d81e415;hb=aa9be22d2798d15580907238cfdbf8f3ffd7364d;hp=f4e5762d78c52024dfad15245960599140c813a6;hpb=dbea144f7249f9c244e748ac972fd86a54ee2086;p=vpn-setup

diff --git a/vpn-mk-client-cert b/vpn-mk-client-cert
index f4e5762..59ddda5 100755
--- a/vpn-mk-client-cert
+++ b/vpn-mk-client-cert
@@ -25,18 +25,24 @@ usage() {
   cat <<'EOF'
 usage: ${0##*/} VPN_SERVER_HOST
 
--b COMMON_NAME   By default, use $HOSTNAME or $CLIENT_HOST. If the cert
-                 already exists on the server, with the CLIENT_NAME
-                 name, we use the existing one. See comment below if we
-                 ever want to check existing common names. They must be
-                 unique per server, so you can use $(uuidgen) if
-                 needed. You used to be able to create multiple with the
-                 same name, but not connect at the same time, but now,
-                 the generator keeps track, so you can't generate.
--c CLIENT_HOST   default is localhost. Else we ssh to root@CLIENT_HOST
+-b COMMON_NAME   By default, use $CLIENT_HOST or if it is not given,
+                 $HOSTNAME. If the cert already exists on the server,
+                 with the CLIENT_NAME name, we use the existing one. See
+                 comment below if we ever want to check existing common
+                 names. They must be unique per server, so you can use
+                 $(uuidgen) if needed. You used to be able to create
+                 multiple with the same name, but not connect at the
+                 same time, but now, the generator keeps track, so you
+                 can't generate.
+
+-c CLIENT_HOST   Default is localhost. Else we ssh to root@CLIENT_HOST.
+-f               Force. Proceed even if cert already exists.
 -n CONFIG_NAME   default is client
--s SCRIPT_PATH   Use custom up/down script at SCRIPT_PATH. copied to same path
-                 on client, if client is not localhost.
+-o SERVER_CONFIG_NAME  Default is CONFIG_NAME
+-s SCRIPT_PATH   Use custom up/down script at SCRIPT_PATH. If client host is
+                 not localhost, the script is copied to it. The default
+                 script used to be /etc/openvpn/update-resolv-conf, but now
+                 that systemd-resolved is becoming popular, there is no default.
 
 Generate a client cert and config and install it on locally or on
 CLIENT_HOST if given.  Uses default config options, and expects be able
@@ -61,24 +67,29 @@ EOF
 
 shell="bash -c"
 name=client
-custom_script=false
-script=/etc/openvpn/update-resolv-conf
 client_host=$CLIENT_HOST
+force=false
 
-temp=$(getopt -l help hb:c:n:s: "$@") || usage 1
+temp=$(getopt -l help hb:c:fn:o:s: "$@") || usage 1
 eval set -- "$temp"
 while true; do
   case $1 in
     -b) common_name="$2"; shift 2 ;;
     -c) client_host=$2; shell="ssh root@$client_host"; shift 2 ;;
+    -f) force=true; shift ;;
     -n) name="$2"; shift 2 ;;
-    -s) custom_script=true; script="$2"; shift 2 ;;
+    -o) server_name="$2"; shift 2 ;;
+    -s) script="$2"; shift 2 ;;
     -h|--help) usage ;;
     --) shift; break ;;
     *) echo "$0: Internal error! unexpected args: $*" ; exit 1 ;;
   esac
 done
 
+if [[ ! $server_name ]]; then
+  server_name="$name"
+fi
+
 if [[ ! $common_name ]]; then
   if [[ $client_host ]]; then
     common_name=$client_host
@@ -93,16 +104,32 @@ host=$1
 ####### end command line parsing and checking ##############
 
 
+f=/etc/openvpn/client/$name.crt
+
+cert_to_test=$f
+if [[ $client_host ]]; then
+  cert_to_test=$(mktemp)
+  ssh root@$client_host cat $f 2>/dev/null >$cert_to_test ||:
+fi
+if ! $force && openssl x509 -checkend $(( 60 * 60 * 24 * 30 )) -noout -in $cert_to_test &>/dev/null; then
+  echo "$0: cert already exists. exiting early"
+  exit 0
+fi
+
+
 # bash or else we get motd spam. note sleep 2, sleep 1 failed.
-if ! ssh root@$host bash -s -- $name $common_name < client-cert-helper \
+$shell '[[ -e /etc/openvpn ]] || apt install openvpn'
+if ! ssh root@$host bash -s -- $server_name $common_name < client-cert-helper \
     |  $shell 'id -u | grep -xF 0 || s=sudo; $s tar xzv -C /etc/openvpn/client'; then
   echo ssh root@$host cat /tmp/vpn-mk-client-cert.log:
   ssh root@$host cat /tmp/vpn-mk-client-cert.log
+  echo EOF for root@$host:/tmp/vpn-mk-client-cert.log
   exit 1
 fi
 
+port=$(echo '/^port/ {print $2}' | ssh root@$host awk -f - /etc/openvpn/server/$name.conf | tail -n1)
+
 
-f=/etc/openvpn/client/$name.crt
 if ! $shell "test -s $f"; then
   # if common name is not unique, you get empty file. and if we didn't silence
   # build-key, you'd see an error "TXT_DB error number 2"
@@ -115,24 +142,18 @@ $shell "dd of=/etc/openvpn/client/$name.conf" <<EOF
 client
 dev tun
 proto udp
-remote $host 1194
+remote $host $port
 resolv-retry infinite
 nobind
 persist-key
 persist-tun
-ca $name-ca.crt
+ca ca-$name.crt
 cert $name.crt
 key $name.key
 # disabled for better performance
 #comp-lzo
 verb 3
 
-# This script will update local dns
-# to what the server sends, if it sends dns.
-script-security 2
-up "$script"
-down "$script"
-
 # matching server config
 cipher AES-256-CBC
 
@@ -148,12 +169,20 @@ persist-key
 # The minimum of the client & server config is what is used by openvpn.
 reneg-sec 432000
 
-tls-auth $name-ta.key 1
+tls-auth ta-$name.key 1
+EOF
+
+if [[ $script ]]; then
+  $shell "tee -a /etc/openvpn/client/$name.conf" <<EOF
+script-security 2
+up "$script"
+down "$script"
 EOF
 
-if [[ $client_host ]] && $custom_script; then
-  $shell "dd of=$script" <$script
-  $shell "chmod +x $script"
+  if [[ $client_host && $script ]]; then
+    $shell "dd of=$script" <$script
+    $shell "chmod +x $script"
+  fi
 fi
 
 $shell 'cd /etc/openvpn; for f in client/*; do ln -sf $f .; done'