1 files changed, 79 insertions, 0 deletions
diff --git a/meta/recipes-connectivity/openssh/openssh/sshd_check_keys b/meta/recipes-connectivity/openssh/openssh/sshd_check_keys
new file mode 100644
index 0000000000..ef117de897
--- /dev/null
+++ b/meta/recipes-connectivity/openssh/openssh/sshd_check_keys
@@ -0,0 +1,79 @@
+#! /bin/sh
+
+generate_key() {
+    local FILE=$1
+    local TYPE=$2
+    local DIR="$(dirname "$FILE")"
+
+    mkdir -p "$DIR"
+    rm -f ${FILE}.tmp
+    ssh-keygen -q -f "${FILE}.tmp" -N '' -t $TYPE
+
+    # Atomically rename file public key
+    mv -f "${FILE}.tmp.pub" "${FILE}.pub"
+
+    # This sync does double duty: Ensuring that the data in the temporary
+    # private key file is on disk before the rename, and ensuring that the
+    # public key rename is completed before the private key rename, since we
+    # switch on the existence of the private key to trigger key generation.
+    # This does mean it is possible for the public key to exist, but be garbage
+    # but this is OK because in that case the private key won't exist and the
+    # keys will be regenerated.
+    #
+    # In the event that sync understands arguments that limit what it tries to
+    # fsync(), we provided them. If it does not, it will simply call sync()
+    # which is just as well
+    sync "${FILE}.pub" "$DIR" "${FILE}.tmp"
+
+    mv "${FILE}.tmp" "$FILE"
+
+    # sync to ensure the atomic rename is committed
+    sync "$DIR"
+}
+
+# /etc/default/ssh may set SYSCONFDIR and SSHD_OPTS
+if test -f /etc/default/ssh; then
+    . /etc/default/ssh
+fi
+
+[ -z "$SYSCONFDIR" ] && SYSCONFDIR=/etc/ssh
+mkdir -p $SYSCONFDIR
+
+# parse sshd options
+set -- ${SSHD_OPTS} --
+sshd_config=/etc/ssh/sshd_config
+while true ; do
+    case "$1" in
+    -f*) if [ "$1" = "-f" ] ; then
+            sshd_config="$2"
+            shift
+        else
+            sshd_config="${1#-f}"
+        fi
+        shift
+        ;;
+    --) shift; break;;
+    *) shift;;
+    esac
+done
+
+HOST_KEYS=$(sed -n 's/^[ \t]*HostKey[ \t]\+\(.*\)/\1/p' "${sshd_config}")
+[ -z "${HOST_KEYS}" ] && HOST_KEYS="$SYSCONFDIR/ssh_host_rsa_key $SYSCONFDIR/ssh_host_ecdsa_key $SYSCONFDIR/ssh_host_ed25519_key"
+
+for key in ${HOST_KEYS} ; do
+    [ -f $key ] && continue
+    case $key in
+    *_rsa_key)
+        echo "  generating ssh RSA host key..."
+        generate_key $key rsa
+        ;;
+    *_ecdsa_key)
+        echo "  generating ssh ECDSA host key..."
+        generate_key $key ecdsa
+        ;;
+    *_ed25519_key)
+        echo "  generating ssh ED25519 host key..."
+        generate_key $key ed25519
+        ;;
+    esac
+done