Example kiki script samizdat-init-key.sh

1 files changed, 50 insertions, 0 deletions

diff --git a/examples/samizdat-init-key.sh b/examples/samizdat-init-key.sh
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+++ b/examples/samizdat-init-key.sh
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+#!/bin/sh
+
+pem_to_onion_url()
+{
+  perl -MMIME::Base64 -MDigest::SHA=sha1 -MMIME::Base32=RFC -e '
+  $key=decode_base64(join "", grep {!/[-:]/} qx(ssh-keygen -m PEM -e -f $ARGV[0]));
+  printf "%s.onion\n", lc MIME::Base32::encode(substr(sha1($key), 0, 10))' "$1"
+}
+
+makepub () {
+  tag="$1"
+  path="$2"
+  [ -f $path ] || {
+    mkdir -p "$(dirname $path)"
+    kiki --show-pem "$tag" | ssh-keygen -f /dev/stdin -i -m PKCS8 > "$path"
+    echo "$path": exported >&2
+  }
+}
+
+# External commands invoked by kiki in order to generate keys.
+# Notice that $file will not be interpolated until kiki runs the command.
+ssh='mkdir -p "$(dirname $file)" && ssh-keygen -P "" -q -f $file -b 2048'
+ssl='mkdir -p "$(dirname $file)" && openssl genrsa -out $file 1024'
+
+tty -s && echo -n 'Passphrase: '
+read passphrase
+
+# First, we ensure that the tor key exists and is imported
+# so that we know where to put the strongswan key.
+torkey="$ROOT"/var/lib/tor/samizdat/private_key
+echo "$passphrase" | \
+  kiki --keypairs tor="$torkey{$ssl}" \
+       --passphrase-fd 0  || exit
+onion_url=$(pem_to_onion_url "$torkey") || exit
+
+# Now import, export, or generate the remaining secret keys.
+echo "$passphrase" | \
+  kiki --keypairs                                                         \
+          strongswan="$ROOT"/etc/ipsec.d/private/"$onion_url".pem{"$ssl"} \
+          ssh-client="$ROOT$HOME"/.ssh/id_rsa{"$ssh"}                     \
+          ssh-host="$ROOT"/etc/ssh/ssh_host_rsa_key{"$ssh"}               \
+       --passphrase-fd 0  || exit
+
+# Finally, export public keys if they do not exist.
+makepub ssh-client "$ROOT$HOME/.ssh/id_rsa.pub"
+makepub ssh-host   "$ROOT/etc/ssh/ssh_host_rsa_key.pub"
+
+# TODO: makepub can be made obsolete by implementing something like this:
+# kiki --public ssh-client=$ROOT$HOME/.ssh/id_rsa.pub          \
+#               ssh-host="$ROOT"/etc/ssh/ssh_host_rsa_key.pub