diff options
Diffstat (limited to 'roles/common/files')
| -rwxr-xr-x | roles/common/files/usr/local/bin/genkeypair.sh | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/roles/common/files/usr/local/bin/genkeypair.sh b/roles/common/files/usr/local/bin/genkeypair.sh new file mode 100755 index 0000000..2af24cf --- /dev/null +++ b/roles/common/files/usr/local/bin/genkeypair.sh @@ -0,0 +1,128 @@ +#!/bin/sh + +# Generate self-signed server certificates. Inspired from +# make-ssl-cert(8). +# XXX: add support for DKIM and OpenSSH +# +# Copyright © 2014 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/>. + +set -ue +PATH=/usr/bin:/bin + +# Default values +type=rsa +bits= +hash=sha1 + +force= +pubkey=pubkey.pem +privkey=privkey.pem + +usage() { + cat >&2 <<- EOF + Usage: $0 [OPTIONS] + Generate self-signed server certificates + + Options: + -t type: key type (default: rsa) + -b bits: key length or EC curve (default: 2048 for RSA, 1024 for DSA, secp224r1 for ECDSA) + -h digest: digest algorithm (default: sha1) + -n CN: common name (default: \$(hostname --fqdn) + -f force: overwrite key files if they exist + --pubkey: public key file (default: pubkey.pem) + --privkey: private key file (default: privkey.pem; created with og-rwx) + + Return values: + 0 The key pair was successfully generated + 1 The public or private key file exists, and -f is not set + 2 The key generation failed + EOF +} + +name=$(hostname --fqdn) +while [ $# -gt 0 ]; do + case "$1" in + -t) shift; type="$1";; + -t*) type="${1#-t}";; + + -b) shift; bits="$1";; + -b*) bits="${1#-b}";; + + -h) shift; hash="$1";; + -h*) hash="${1#-h}";; + + -n) shift; name="$1";; + -n*) name="${1#-n}";; + + -f) force=1;; + --pubkey=*) pubkey="${1#--pubkey=}";; + --privkey=*) privkey="${1#--privkey=}";; + + --help) usage; exit;; + *) echo "Unrecognized argument: $1" >&2; exit 2 + esac + shift; +done + +rand=/dev/urandom +case "$type" in + rsa) genkey=genrsa; genkeyargs="-f4 ${bits:-2048}";; + dsa) genkey=dsaparam; genkeyargs="-noout -genkey ${bits:-1024}";; + # See 'openssl ecparam -list_curves' for the list of supported + # curves. StrongSwan doesn't support explicit curve parameters + # (however explicit parameters might be required to make exotic + # curves work with some clients.) + ecdsa) genkey=ecparam + genkeyargs="-noout -name ${bits:-secp224r1} -param_enc named_curve -genkey";; + *) echo "Unrecognized key type: $type" >&2; exit 2 +esac + +case "$hash" in + md5|rmd160|sha1|sha224|sha256|sha384|sha512) ;; + *) echo "Invalid digest algorithm: $hash" >&2; exit 2; +esac + +[ ${#name} -le 64 ] || { echo "Hostname too long: $name" >&2; exit 2; } +for file in "$pubkey" "$privkey"; do + [ -z "$force" -a -s "$file" ] || continue + echo "Error: File exists: $file" >&2 + exit 1 +done + +config=$(mktemp) || exit 2 +trap 'rm -f "$config"' EXIT +# see /usr/share/ssl-cert/ssleay.cnf +cat >"$config" <<- EOF + [ req ] + distinguished_name = req_distinguished_name + prompt = no + policy = policy_anything + req_extensions = v3_req + x509_extensions = v3_req + + [ req_distinguished_name ] + commonName = $name + + [ v3_req ] + basicConstraints = critical, CA:FALSE +EOF + +# Ensure "$privkey" is created with umask 0077 +mv "$(mktemp)" "$privkey" || exit 2 +chmod og-rwx "$privkey" || exit 2 + +openssl $genkey -rand /dev/urandom $genkeyargs >"$privkey" || exit 2 +openssl req -config "$config" -new -x509 -days 3650 -"$hash" -key "$privkey" >"$pubkey" || exit 2 |