1 files changed, 127 insertions, 0 deletions
diff --git a/src/share/m/gen_subkey b/src/share/m/gen_subkey
new file mode 100644
index 0000000..cbefaa3
--- /dev/null
+++ b/src/share/m/gen_subkey
@@ -0,0 +1,127 @@
+# -*-shell-script-*-
+# This should be sourced by bash (though we welcome changes to make it POSIX sh compliant)
+
+# Monkeysphere gen-subkey subcommand
+#
+# The monkeysphere scripts are written by:
+# Jameson Rollins <jrollins@finestructure.net>
+# Jamie McClelland <jm@mayfirst.org>
+# Daniel Kahn Gillmor <dkg@fifthhorseman.net>
+#
+# They are Copyright 2008-2009, and are all released under the GPL,
+# version 3 or later.
+
+# generate a subkey with the 'a' usage flags set
+
+gen_subkey(){
+    local keyLength
+    local keyExpire
+    local keyID
+    local gpgOut
+    local userID
+
+    # get options
+    while true ; do
+	case "$1" in
+	    -l|--length)
+		keyLength="$2"
+		shift 2
+		;;
+	    -e|--expire)
+		keyExpire="$2"
+		shift 2
+		;;
+	    *)
+		if [ "$(echo "$1" | cut -c 1)" = '-' ] ; then
+		    failure "Unknown option '$1'.
+Type '$PGRM help' for usage."
+		fi
+		break
+		;;
+	esac
+    done
+
+    case "$#" in
+	0)
+	    gpgSecOut=$(gpg --quiet --fixed-list-mode --list-secret-keys --with-colons 2>/dev/null | egrep '^sec:')
+	    ;;
+	1)
+	    gpgSecOut=$(gpg --quiet --fixed-list-mode --list-secret-keys --with-colons "$1" | egrep '^sec:') || failure
+	    ;;
+	*)
+	    failure "You must specify only a single primary key ID."
+	    ;;
+    esac
+
+    # check that only a single secret key was found
+    case $(echo "$gpgSecOut" | grep -c '^sec:') in
+	0)
+	    failure "No secret keys found.  Create an OpenPGP key with the following command:
+ gpg --gen-key"
+	    ;;
+	1)
+	    keyID=$(echo "$gpgSecOut" | cut -d: -f5)
+	    ;;
+	*)
+	    echo "Multiple primary secret keys found:"
+	    echo "$gpgSecOut" | cut -d: -f5
+	    failure "Please specify which primary key to use."
+	    ;;
+    esac
+
+    # check that a valid authentication key does not already exist
+    IFS=$'\n'
+    for line in $(gpg --quiet --fixed-list-mode --list-keys --with-colons "$keyID") ; do
+	type=$(echo "$line" | cut -d: -f1)
+	validity=$(echo "$line" | cut -d: -f2)
+	usage=$(echo "$line" | cut -d: -f12)
+
+	# look at keys only
+	if [ "$type" != 'pub' -a "$type" != 'sub' ] ; then
+	    continue
+	fi
+	# check for authentication capability
+	if ! check_capability "$usage" 'a' ; then
+	    continue
+	fi
+	# if authentication key is valid, prompt to continue
+	if [ "$validity" = 'u' ] ; then
+	    echo "A valid authentication key already exists for primary key '$keyID'."
+	    read -p "Are you sure you would like to generate another one? (y/N) " OK; OK=${OK:N}
+	    if [ "${OK/y/Y}" != 'Y' ] ; then
+		failure "aborting."
+	    fi
+	    break
+	fi
+    done
+
+    # set subkey defaults
+    # prompt about key expiration if not specified
+    keyExpire=$(get_gpg_expiration "$keyExpire")
+
+    # generate the list of commands that will be passed to edit-key
+    editCommands=$(cat <<EOF
+addkey
+7
+S
+E
+A
+Q
+$keyLength
+$keyExpire
+save
+EOF
+)
+
+    log verbose "generating subkey..."
+    fifoDir=$(mktemp -d ${TMPDIR:-/tmp}/tmp.XXXXXXXXXX)
+    (umask 077 && mkfifo "$fifoDir/pass")
+    echo "$editCommands" | gpg --passphrase-fd 3 3< "$fifoDir/pass" --expert --command-fd 0 --edit-key "$keyID" &
+
+    # FIXME: this needs to fail more gracefully if the passphrase is incorrect
+    passphrase_prompt  "Please enter your passphrase for $keyID: " "$fifoDir/pass"
+
+    rm -rf "$fifoDir"
+    wait
+    log verbose "done."
+}