Add support for ed25519 host keys

dropbear_install

@@ -1,45 +1,46 @@
 #!/bin/sh
 
+set -e
+
+KEY_TYPES="ed25519 ecdsa rsa"
+
 get_fingerprint() {
-    keyfile="$1"
-    dropbearkey -y -f "${keyfile}" | sed -n '/^Fingerprint:/ {s/Fingerprint: *//; p}'
+    kf="$1"
+    dropbearkey -y -f "${kf}" | sed -n '/^Fingerprint:/ {s/Fingerprint: *//; p}'
 }
 
 display_fingerprints() {
-    for keyfile in "/etc/dropbear/dropbear_rsa_host_key" "/etc/dropbear/dropbear_ecdsa_host_key"; do
-        if [ -s "${keyfile}" ]; then
-            echo "$(basename "${keyfile}") : $(get_fingerprint "${keyfile}")"
+    for kt in $KEY_TYPES; do
+        kf="/etc/dropbear/dropbear_${kt}_host_key"
+        if [ -s "${kf}" ]; then
+            echo "$(basename "${kf}") : $(get_fingerprint "${kf}")"
         fi
     done
 }
 
 copy_openssh_keys() {
-    osshrsa="/etc/ssh/ssh_host_rsa_key"
-    osshecdsa="/etc/ssh/ssh_host_ecdsa_key"
-
-    dbpre="/etc/dropbear/dropbear_"
-
     return_code=1
 
-    if [ -s "$osshrsa" ]; then
-        dropbearconvert openssh dropbear $osshrsa ${dbpre}rsa_host_key
-        return_code=0
-    fi
-
-    if [ -s "$osshecdsa" ]; then
-        dropbearconvert openssh dropbear $osshecdsa ${dbpre}ecdsa_host_key
-        return_code=0
-    fi
+    for kt in $KEY_TYPES; do
+        osshkey="/etc/ssh/ssh_host_$kt"
+        if [ -s "$osshkey" ]; then
+            dropbearconvert \
+                openssh dropbear \
+                "$osshkey" \
+                "/etc/dropbear/dropbear_${kt}_host_key"
+            return_code=0
+        fi
+    done
 
     return $return_code
 }
 
 generate_keys() {
-    for keytype in rsa ecdsa; do
-        keyfile="/etc/dropbear/dropbear_${keytype}_host_key"
-        if [ ! -s "$keyfile" ]; then
-            echo "Generating ${keytype} host key for dropbear ..."
-            dropbearkey -t "${keytype}" -f "${keyfile}"
+    for kt in $KEY_TYPES; do
+        kf="/etc/dropbear/dropbear_${kt}_host_key"
+        if [ ! -s "$kf" ]; then
+            echo "Generating ${kt} host key for dropbear ..."
+            dropbearkey -t "${kt}" -f "${kf}"
         fi
     done
 }