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authorGuilhem Moulin <guilhem@fripost.org>2014-06-28 22:37:14 +0200
committerGuilhem Moulin <guilhem@fripost.org>2015-06-07 02:52:05 +0200
commit9692d409658ce552ab3e0d9f41aadca1c7bcb407 (patch)
treec4bbed5b3f7023c7fcdc464e11d571668dc5290c /roles/common/files
parenta0b0b6de279d37641dd1eeb374e52d6fce73ab1d (diff)
Make genkeypair.sh able to display TXT record for DKIM signatures.
Diffstat (limited to 'roles/common/files')
-rwxr-xr-xroles/common/files/usr/local/bin/genkeypair.sh82
1 files changed, 56 insertions, 26 deletions
diff --git a/roles/common/files/usr/local/bin/genkeypair.sh b/roles/common/files/usr/local/bin/genkeypair.sh
index 6c75fa4..16f9658 100755
--- a/roles/common/files/usr/local/bin/genkeypair.sh
+++ b/roles/common/files/usr/local/bin/genkeypair.sh
@@ -1,8 +1,8 @@
#!/bin/sh
-# Generate self-signed server certificates. Inspired from
-# make-ssl-cert(8).
-# XXX: add support for DKIM and OpenSSH
+# Wrapper around openssl to generate self-signed X.509 server
+# certificates or Certificate Signing Requests, or DKIM private keys.
+# Inspired from make-ssl-cert(8) and opendkim-genkey(8).
#
# Copyright © 2014 Guilhem Moulin <guilhem@fripost.org>
#
@@ -28,7 +28,6 @@ bits=
hash=
force=
-x509=-x509
config=
pubkey=pubkey.pem
privkey=privkey.pem
@@ -36,8 +35,12 @@ dns=
usage() {
cat >&2 <<- EOF
- Usage: $0 [OPTIONS]
- Generate self-signed server certificates
+ Usage: $0 command [OPTIONS]
+
+ Command:
+ x509: generate a self-signed X.509 server certificate
+ csr: generate a Certificate Signing Request
+ dkim: generate a DKIM private key
Options:
-t type: key type (default: rsa)
@@ -45,7 +48,6 @@ usage() {
-h digest: digest algorithm
--dns CN: common name (default: \$(hostname --fqdn); can be repeated
-f force: overwrite key files if they exist
- --csr: generate a Certificate Signing Request instead
--config: configuration file
--pubkey: public key file (default: pubkey.pem)
--privkey: private key file (default: privkey.pem; created with og-rwx)
@@ -57,6 +59,13 @@ usage() {
EOF
}
+[ $# -gt 0 ] || { usage; exit 2; }
+cmd="$1"; shift
+case "$cmd" in
+ x509|csr|dkim) ;;
+ *) echo "Unrecognized command: $cmd" >&2; exit 2
+esac
+
while [ $# -gt 0 ]; do
case "$1" in
-t) shift; type="$1";;
@@ -73,7 +82,6 @@ while [ $# -gt 0 ]; do
--pubkey=?*) pubkey="${1#--pubkey=}";;
--privkey=?*) privkey="${1#--privkey=}";;
- --csr) x509=;;
--dns=?*) dns="${dns:+$dns,}${1#--dns=}";;
--config=?*) dns="${1#--config=}";;
@@ -98,22 +106,28 @@ case "$type" in
*) echo "Unrecognized key type: $type" >&2; exit 2
esac
-case "$hash" in
- md5|rmd160|sha1|sha224|sha256|sha384|sha512|'') ;;
- *) echo "Invalid digest algorithm: $hash" >&2; exit 2;
-esac
+cn=
+if [ "$cmd" = x509 -o "$cmd" = csr ]; then
+ case "$hash" in
+ md5|rmd160|sha1|sha224|sha256|sha384|sha512|'') ;;
+ *) echo "Invalid digest algorithm: $hash" >&2; exit 2;
+ esac
-[ "$dns" ] || dns="$(hostname --fqdn)"
-cn="${dns%%,*}"
-[ ${#cn} -le 64 ] || { echo "CommonName too long: $cn" >&2; exit 2; }
+ [ "$dns" ] || dns="$(hostname --fqdn)"
+ cn="${dns%%,*}"
+ [ ${#cn} -le 64 ] || { echo "CommonName too long: $cn" >&2; exit 2; }
+fi
-for file in "$pubkey" "$privkey"; do
- [ -z "$force" -a -s "$file" ] || continue
- echo "Error: File exists: $file" >&2
- exit 1
-done
+[ -s "$privkey" -a -z "$force" ] && force=0
+if [ "$cmd" != dkim ]; then
+ for file in "$pubkey" "$privkey"; do
+ [ "$force" != 1 -a -s "$file" ] || continue
+ echo "Error: File exists: $file" >&2
+ exit 1
+ done
+fi
-if [ -z "$config" ]; then
+if [ -z "$config" -a \( "$cmd" = x509 -o "$cmd" = csr \) ]; then
config=$(mktemp) || exit 2
trap 'rm -f "$config"' EXIT
@@ -144,9 +158,25 @@ if [ -z "$config" ]; then
EOF
fi
-# Ensure "$privkey" is created with umask 0077
-mv "$(mktemp)" "$privkey" || exit 2
-chmod og-rwx "$privkey" || exit 2
+if [ "$force" != 0 ]; then
+ # 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
+fi
-openssl $genkey -rand /dev/urandom $genkeyargs >"$privkey" || exit 2
-openssl req -config "$config" -new $x509 ${hash:+-$hash} -key "$privkey" >"$pubkey" || exit 2
+if [ "$cmd" = x509 -o "$cmd" = csr ]; then
+ [ "$cmd" = x509 ] && x509=-x509 || x509=
+ openssl req -config "$config" -new $x509 ${hash:+-$hash} -key "$privkey" >"$pubkey" || exit 2
+elif [ "$cmd" = dkim ]; then
+ echo "Add the following TXT record to your DNS zone:" >&2
+ echo "${dns:-$(date +%Y%m%d)}._domainkey\tIN\tTXT ( "
+ # See https://tools.ietf.org/html/rfc4871#section-3.6.1
+ # t=s: the "i=" domain in signature headers MUST NOT be a subdomain of "d="
+ # s=email: limit DKIM signing to email
+ openssl pkey -pubout <"$privkey" | sed '/^--.*--$/d' \
+ | { echo -n "v=DKIM1; k=$type; t=s; s=email; p="; tr -d '\n'; } \
+ | fold -w 250 \
+ | { sed 's/.*/\t"&"/'; echo ' )'; }
+ [ "$force" != 0 ] || exit 1
+fi