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[monkeysphere.git] / src / seckey2sshagent

diff --git a/src/seckey2sshagent b/src/seckey2sshagent
index d8e9b79ac2e86da91cf156de986a8434135e7b37..4b765dc1aae94f16eb42b2654935a751bee98a1e 100755 (executable)
--- a/src/seckey2sshagent
+++ b/src/seckey2sshagent
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # seckey2sshagent: this is a hack of a script to cope with the fact
 # that openpgp2ssh currently cannot support encrypted secret keys.
@@ -16,25 +16,98 @@
 
 
 cleanup() {
-    echo -n "removing temp gpg home... "
-    rm -rf $FOO
-    echo "done."
+    echo -n "removing temp gpg home... " 1>&2
+    rm -rf "$TMPPRIVATE"
+    echo "done." 1>&2
 }
 
+explanation() {
+
+    echo -n "The basic strategy of seckey2sshagent is to dump your
+OpenPGP authentication key(s) into your agent.
+
+This script is a gross hack at the moment.  It is done by creating a
+new, temporary private keyring, letting the user remove the
+passphrases from the keys, and then exporting them.  The temporary
+private keyring is purged from the system.
+
+When you use this command, you'll find yourself dropped into a GPG
+'edit-key' dialog relevant *only* to the temporary private keyring.
+
+At that point, you should clear the password from your key, with:
+
+ passwd
+ <enter your current password>
+
+followed by the empty string for the new password.  GPG will ask you
+if you're really sure.  Answer yes, because this is only relevant to
+the temporary keyring.  Then, do:
+
+ save
+
+At this point, your key will be added to your running ssh-agent with
+the alias 'monkeysphere-key' and seckey2sshagent should terminate.
+You can check on it with:
+
+ ssh-add -l
+
+" 
+    
+}
+
+# if no hex string is supplied, just print an explanation.
+# this covers seckey2sshagent --help, --usage, -h, etc...
+if [  "$(echo "$1" | tr -d '0-9a-fA-F')" ]; then
+    explanation
+    exit
+fi
+
 trap cleanup EXIT
 
-GPGID="$1"
+GPGIDS="$1"
 
-idchars=$(echo $GPGID | wc -m)
-if [ "$idchars" -ne 17 ] ; then
-    echo "GPGID is not 16 characters ($idchars)."
-    exit 1
+if [ -z "$GPGIDS" ]; then
+    # hack: we need to get the list of secret keys, because if you
+    # --list-secret-keys with no arguments, GPG fails to print the
+    # capability flags (i've just filed this as
+    # https://bugs.g10code.com/gnupg/issue945)
+    KEYIDS=$(gpg2 --with-colons --list-secret-keys | grep ^sec | cut -f5 -d:)
+    # default to using all fingerprints of authentication-enabled keys 
+    GPGIDS=$(gpg  --with-colons --fingerprint --fingerprint --list-secret-keys $KEYIDS | egrep -A1 '^(ssb|sec):.*:[^:]*a[^:]*:$' | grep ^fpr: | cut -d: -f10)
 fi
 
-FOO=$(mktemp -d)
+for GPGID in $GPGIDS; do
+
+    TMPPRIVATE=$(mktemp -d)
+    
+    gpg --export-secret-key "$GPGID" | GNUPGHOME="$TMPPRIVATE" gpg --import
+    
+# idea to script the password stuff.  not working.
+# read -s -p "enter gpg password: " PASSWD; echo
+# cmd=$(cat <<EOF
+# passwd
+# $PASSWD
+# \n
+# \n
+# \n
+# yes
+# save
+# EOF
+# )
+# echo -e "$cmd" | GNUPGHOME="$TMPPRIVATE" gpg --command-fd 0 --edit-key $GPGID
+    
+    GNUPGHOME="$TMPPRIVATE" gpg --edit-key "$GPGID"
+
+    KEYNAME='MonkeySphere Key '$(echo "$GPGID" | tr -c -d '0-9a-fA-F')''
+# creating this alias so the key is named "monkeysphere-key" in the
+# comment stored by the agent, while never being written to disk in
+# SSH form:
+    ln -s /dev/stdin "$TMPPRIVATE/$KEYNAME"
+    
+    GNUPGHOME="$TMPPRIVATE" gpg --export-secret-keys "$GPGID" | \
+       openpgp2ssh $GPGID | (cd "$TMPPRIVATE" && ssh-add -c "$KEYNAME")
 
-gpg --export-secret-key --export-options export-reset-subkey-passwd $GPGID | GNUPGHOME=$FOO gpg --import
+    cleanup
+done
 
-GNUPGHOME=$FOO gpg --edit-key $GPGID
 
-GNUPGHOME=$FOO gpg --export-secret-key $GPGID | openpgp2ssh $GPGID | ssh-add -c /dev/stdin