openssl: make UCI config aware of built-in engines

Engines that are built into the main libcrypto OpenSSL library can't be
disabled through UCI.  Add a 'builtin' setting to signal that the engine
can't be disabled through UCI, and show a message explaining this in
case buitin=1 and enabled=0.

Signed-off-by: Eneas U de Queiroz <[email protected]>

package/libs/openssl/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=openssl
 PKG_VERSION:=3.0.8
-PKG_RELEASE:=5
+PKG_RELEASE:=6
 PKG_BUILD_FLAGS:=no-mips16 gc-sections
 
 PKG_BUILD_PARALLEL:=1
@@ -138,6 +138,30 @@ $(call Package/openssl/Default/description)
 This package installs the OpenSSL configuration file /etc/ssl/openssl.cnf.
 endef
 
+ifneq ($(CONFIG_OPENSSL_ENGINE_BUILTIN_PADLOCK)$(CONFIG_OPENSSL_ENGINE_BUILTIN_DEVCRYPTO),)
+define Package/libopenssl-conf/postinst
+#!/bin/sh
+OPENSSL_UCI="$${IPKG_INSTROOT}/etc/config/openssl"
+
+add_engine_config() {
+	if [ -z "$${IPKG_INSTROOT}" ] && uci -q get "openssl.$$1" >/dev/null; then
+		[ "$$(uci -q get "openssl.$$1.builtin")" = 1 ] && return
+		uci set "openssl.$$1.builtin=1" && uci commit openssl
+		return
+	fi
+	{
+		echo "engine '$$1'"
+		echo "	option enabled '1'"
+		echo "	option builtin '1'"
+		echo
+	} >>"$${OPENSSL_UCI}"
+}
+
+$(if $(CONFIG_OPENSSL_ENGINE_BUILTIN_DEVCRYPTO),add_engine_config devcrypto)
+$(if $(CONFIG_OPENSSL_ENGINE_BUILTIN_PADLOCK),add_engine_config padlock)
+endef
+endif
+
 $(eval $(call Package/openssl/add-engine,afalg))
 define Package/libopenssl-afalg
   $(call Package/openssl/Default)

package/libs/openssl/files/openssl.init

@@ -6,15 +6,26 @@ ENGINES_CNF="/var/etc/ssl/engines.cnf"
 ENGINES_DIR="%ENGINES_DIR%"
 
 config_engine() {
-	local enabled force
+	local builtin enabled force
+
+	config_get_bool builtin "$1" builtin 0
 	config_get_bool enabled "$1" enabled 1
 	config_get_bool force "$1" force 0
-	[ "$enabled" = 0 ] && return
-	if [ "$force" = 0 ] && \
-	   [ ! -f "${ENGINES_CNF_D}/$1.cnf" ] && \
-	   [ ! -f "${ENGINES_DIR}/$1.so" ]; then
-	    echo Skipping engine "$1": not installed
-	    return
+
+	if [ "$enabled" = 0 ]; then
+		[ "$builtin" != 1 ] && return 1
+		echo "Engine $1 is built into the libcrypto library and can't be disabled through UCI." && \
+		echo "If the engine was not built-in, remove 'config builtin' from /etc/config/openssl."
+	elif [ "$force" = 1 ]; then
+		printf "[Forced] "
+	elif ! grep -q "\\[ *$1 *]" "${ENGINES_CNF_D}"/*; then
+		echo "$1: Could not find section [$1] in config files."
+		return 1
+	elif [ "$builtin" = 1 ]; then
+		printf "[Builtin] "
+	elif [ ! -f "${ENGINES_DIR}/$1.so" ];then
+		echo "$1: ${ENGINES_DIR}/$1.so not found."
+		return 1
 	fi
 	echo Enabling engine "$1"
 	echo "$1=$1" >> "${ENGINES_CNF}"