X-Git-Url: https://iankelling.org/git/?p=vpn-setup;a=blobdiff_plain;f=vpn-mk-client-cert;h=f4e5762d78c52024dfad15245960599140c813a6;hp=4e41bacf8297ba31f032d70c5e31ecafbec1e444;hb=e4c2b65e04673dc12575e4c1a182fe86e3dc219a;hpb=e1e49f58b89db5ea637f2671bf8c1ce35af68e5f

diff --git a/vpn-mk-client-cert b/vpn-mk-client-cert
index 4e41bac..f4e5762 100755
--- a/vpn-mk-client-cert
+++ b/vpn-mk-client-cert
@@ -13,66 +13,105 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# usage: $0 SERVER_HOST [DEST_HOST]
-# ssh to SERVER_HOST, create a cert & client config, put it on
-# DEST_HOST, or localhost by default. Assumes server was setup
-# by the other script in this dir.
-
 set -eE -o pipefail
 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
 
 [[ $EUID == 0 ]] || exec sudo -E "$BASH_SOURCE" "$@"
 
+readonly this_file="$(readlink -f -- "${BASH_SOURCE[0]}")"; cd "${this_file%/*}"
+
+
 usage() {
-    cat <<EOF
+  cat <<'EOF'
 usage: ${0##*/} VPN_SERVER_HOST
 
--c CLIENT_HOST   default is localhost
+-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
 -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.
 
 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
-to ssh to VPN_SERVER_HOST and CLIENT_HOST.
+to ssh to VPN_SERVER_HOST and CLIENT_HOST as root, or if CLIENT_HOST is
+localhost, just to sudo this script as root.
+
+
+
+
+Note: Uses GNU getopt options parsing style
 EOF
-    exit ${1:-0}
+  exit ${1:-0}
 }
 
+# to get the common name
+# cn=$(s openssl x509 -noout -nameopt multiline -subject \
+  #        -in /etc/openvpn/client/mail.crt | \
+  #          sed -rn 's/^\s*commonName\s*=\s*(.*)/\1/p')
+
+
+####### begin command line parsing and checking ##############
+
 shell="bash -c"
 name=client
+custom_script=false
+script=/etc/openvpn/update-resolv-conf
+client_host=$CLIENT_HOST
 
-temp=$(getopt -l help hc:n: "$@") || usage 1
+temp=$(getopt -l help hb:c:n:s: "$@") || usage 1
 eval set -- "$temp"
 while true; do
-    case $1 in
-        -c) shell="ssh $2"; shift 2 ;;
-        -n) name="$2"; shift 2 ;;
-        -h|--help) usage ;;
-        --) shift; break ;;
-        *) echo "$0: Internal error! unexpected args: $*" ; exit 1 ;;
-    esac
+  case $1 in
+    -b) common_name="$2"; shift 2 ;;
+    -c) client_host=$2; shell="ssh root@$client_host"; shift 2 ;;
+    -n) name="$2"; shift 2 ;;
+    -s) custom_script=true; script="$2"; shift 2 ;;
+    -h|--help) usage ;;
+    --) shift; break ;;
+    *) echo "$0: Internal error! unexpected args: $*" ; exit 1 ;;
+  esac
 done
-host=$1
-[[ $host ]] || usage 1
 
-# bash or else we get motd spam. note sleep 2, sleep 1 failed.
-ssh $host bash <<EOF | $shell 'id -u | grep -xF 0 || s=sudo; $s tar xzv -C /etc/openvpn/client'
-set -eE -o pipefail
-cd /etc/openvpn/easy-rsa
-source vars >/dev/null
+if [[ ! $common_name ]]; then
+  if [[ $client_host ]]; then
+    common_name=$client_host
+  else
+    common_name=$HOSTNAME
+  fi
+fi
 
-# uuidgen because common name must be unique
-{ echo -e '\n\n\n\n\n'\$(uuidgen)'\n\n\n\n\n'; sleep 2; echo -e 'y\ny\n'; } | ./build-key $name &>/dev/null
+host=$1
+[[ $host ]] || usage 1
 
-d=\$(mktemp -d)
-cp /etc/openvpn/easy-rsa/keys/ca.crt \$d/$name-ca.crt
-mv /etc/openvpn/easy-rsa/keys/$name.{crt,key} \$d
+####### end command line parsing and checking ##############
 
-tar cz -C \$d .
-rm -rf \$d
-EOF
 
-cat > /etc/openvpn/client/$name.conf <<EOF
-# From example config, from debian stretch as of 1-2017
+# bash or else we get motd spam. note sleep 2, sleep 1 failed.
+if ! ssh root@$host bash -s -- $name $common_name < client-cert-helper \
+    |  $shell '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@$host cat /tmp/vpn-mk-client-cert.log
+  exit 1
+fi
+
+
+f=/etc/openvpn/client/$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"
+  echo "$0: error: $f is empty or otherwise bad. is this common name unique?"
+  exit 1
+fi
+
+$shell "dd of=/etc/openvpn/client/$name.conf" <<EOF
+# From example config, from debian stretch to buster
 client
 dev tun
 proto udp
@@ -91,12 +130,11 @@ verb 3
 # This script will update local dns
 # to what the server sends, if it sends dns.
 script-security 2
-up /etc/openvpn/update-resolv-conf
-down /etc/openvpn/update-resolv-conf
+up "$script"
+down "$script"
 
 # matching server config
-cipher aes-256-cbc
-
+cipher AES-256-CBC
 
 # example config has the commented line, but this other thing looks stronger,
 # and I've seen it in a vpn provider I trust
@@ -105,4 +143,17 @@ remote-cert-tls server
 
 # more resilient when running as nonroot
 persist-key
+
+# See comments in server side configuration.
+# The minimum of the client & server config is what is used by openvpn.
+reneg-sec 432000
+
+tls-auth $name-ta.key 1
 EOF
+
+if [[ $client_host ]] && $custom_script; then
+  $shell "dd of=$script" <$script
+  $shell "chmod +x $script"
+fi
+
+$shell 'cd /etc/openvpn; for f in client/*; do ln -sf $f .; done'