openssl: add legacy provider

This adapts the engine build infrastructure to allow building providers,
and packages the legacy provider.  Providers are the successors of
engines, which have been deprecated.

The legacy provider supplies OpenSSL implementations of algorithms that
have been deemed legacy, including DES, IDEA, MDC2, SEED, and Whirlpool.

Even though these algorithms are implemented in a separate package,
their removal makes the regular library smaller by 3%, so the build
options will remain to allow lean custom builds.  Their defaults will
change to 'y' if not bulding for a small flash, so that the regular
legacy package will contain a complete set of algorithms.

The engine build and configuration structure was changed to accomodate
providers, and adapt to the new style of openssl.cnf in version 3.0.

There is not a clean upgrade path for the /etc/ssl/openssl.cnf file,
installed by the openssl-conf package.  It is recommended to rename or
remove the old config file when flashing an image with the updated
openssl-conf package, then apply the changes manually.

An old openssl.cnf file will silently work, but new engine or provider
packages will not be enabled.  Any remaining engine config files under
/etc/ssl/engines.cnf.d can be removed.

On the build side, the include file used by engine packages was renamed
to openssl-module.mk, so the engine packages in other feeds need to
adapt.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

10 files changed, 202 insertions, 95 deletions

diff --git a/include/openssl-engine.mk b/include/openssl-engine.mk
deleted file mode 100644
index 891d284f12..0000000000
--- a/include/openssl-engine.mk
+++ /dev/null
@@ -1,50 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-#
-# Copyright (C) 2022-2023 Enéas Ulir de Queiroz
-
-ENGINES_DIR=engines-3
-
-define Package/openssl/engine/Default
-  SECTION:=libs
-  CATEGORY:=Libraries
-  SUBMENU:=SSL
-  DEPENDS:=libopenssl @OPENSSL_ENGINE +libopenssl-conf
-endef
-
-# 1 = engine name
-# 2 - package name, defaults to libopenssl-$(1)
-define Package/openssl/add-engine
-  OSSL_ENG_PKG:=$(if $(2),$(2),libopenssl-$(1))
-  Package/$$(OSSL_ENG_PKG)/conffiles:=/etc/ssl/engines.cnf.d/$(1).cnf
-
-  define Package/$$(OSSL_ENG_PKG)/install
-	$$(INSTALL_DIR)  $$(1)/usr/lib/$(ENGINES_DIR)
-	$$(INSTALL_BIN)  $$(PKG_INSTALL_DIR)/usr/lib/$(ENGINES_DIR)/$(1).so \
-			 $$(1)/usr/lib/$(ENGINES_DIR)
-	$$(INSTALL_DIR)  $$(1)/etc/ssl/engines.cnf.d
-	$$(INSTALL_DATA) ./files/$(1).cnf $$(1)/etc/ssl/engines.cnf.d/
-  endef
-
-  define Package/$$(OSSL_ENG_PKG)/postinst :=
-#!/bin/sh
-OPENSSL_UCI="$$$${IPKG_INSTROOT}/etc/config/openssl"
-
-[ -z "$$$${IPKG_INSTROOT}" ] && uci -q get openssl.$(1) >/dev/null && exit 0
-
-cat << EOF >> "$$$${OPENSSL_UCI}"
-
-config engine '$(1)'
-	option enabled '1'
-EOF
-
-[ -n "$$$${IPKG_INSTROOT}" ] || /etc/init.d/openssl reload
-  endef
-
-  define Package/$$(OSSL_ENG_PKG)/postrm :=
-#!/bin/sh
-[ -n "$$$${IPKG_INSTROOT}" ] && exit 0
-uci delete openssl.$(1)
-uci commit openssl
-/etc/init.d/openssl reload
-  endef
-endef
diff --git a/include/openssl-module.mk b/include/openssl-module.mk
new file mode 100644
index 0000000000..7348a10dbc
--- /dev/null
+++ b/include/openssl-module.mk
@@ -0,0 +1,79 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Copyright (C) 2022-2023 Enéas Ulir de Queiroz
+
+ENGINES_DIR=engines-3
+
+define Package/openssl/module/Default
+  SECTION:=libs
+  CATEGORY:=Libraries
+  SUBMENU:=SSL
+  DEPENDS:=libopenssl +libopenssl-conf
+endef
+
+define Package/openssl/engine/Default
+  $(Package/openssl/module/Default)
+  DEPENDS+=@OPENSSL_ENGINE
+endef
+
+
+# 1 = moudule type (engine|provider)
+# 2 = module name
+# 3 = directory to save .so file
+# 4 = [ package name, defaults to libopenssl-$(2) ]
+define Package/openssl/add-module
+  $(eval MOD_TYPE:=$(1))
+  $(eval MOD_NAME:=$(2))
+  $(eval MOD_DIR:=$(3))
+  $(eval OSSL_PKG:=$(if $(4),$(4),libopenssl-$(MOD_NAME)))
+  $(info Package/openssl/add-module 1='$(1)'; 2='$(2)'; 3='$(3)' 4='$(4)')
+  $(info MOD_TYPE='$(MOD_TYPE)'; MOD_NAME='$(MOD_NAME)'; MOD_DIR='$(MOD_DIR)' OSSL_PKG='$(OSSL_PKG)')
+  Package/$(OSSL_PKG)/conffiles:=/etc/ssl/modules.cnf.d/$(MOD_NAME).cnf
+
+  define Package/$(OSSL_PKG)/install
+	$$(INSTALL_DIR)  $$(1)/$(MOD_DIR)
+	$$(INSTALL_BIN)  $$(PKG_INSTALL_DIR)/$(MOD_DIR)/$(MOD_NAME).so \
+			 $$(1)/$(MOD_DIR)
+	$$(INSTALL_DIR)  $$(1)/etc/ssl/modules.cnf.d
+	$$(INSTALL_DATA) ./files/$(MOD_NAME).cnf $$(1)/etc/ssl/modules.cnf.d/
+  endef
+
+  define Package/$(OSSL_PKG)/postinst
+#!/bin/sh
+OPENSSL_UCI="$$$${IPKG_INSTROOT}/etc/config/openssl"
+
+[ -z "$$$${IPKG_INSTROOT}" ] \
+	&& uci -q get openssl.$(MOD_NAME) >/dev/null \
+	&& exit 0
+
+cat << EOF >> "$$$${OPENSSL_UCI}"
+
+config $(MOD_TYPE) '$(MOD_NAME)'
+	option enabled '1'
+EOF
+
+[ -n "$$$${IPKG_INSTROOT}" ] || /etc/init.d/openssl reload
+exit 0
+  endef
+
+  define Package/$(OSSL_PKG)/postrm
+#!/bin/sh
+[ -n "$$$${IPKG_INSTROOT}" ] && exit 0
+uci -q delete openssl.$(MOD_NAME) && uci commit openssl
+/etc/init.d/openssl reload
+exit 0
+  endef
+endef
+
+# 1 = engine name
+# 2 - package name, defaults to libopenssl-$(1)
+define Package/openssl/add-engine
+  $(call Package/openssl/add-module,engine,$(1),/usr/lib/$(ENGINES_DIR),$(2))
+endef
+
+# 1 = provider name
+# 2 = [ package name, defaults to libopenssl-$(1) ]
+define Package/openssl/add-provider
+  $(call Package/openssl/add-module,provider,$(1),/usr/lib/ossl-modules,$(2))
+endef
+
diff --git a/package/libs/openssl/Config.in b/package/libs/openssl/Config.in
index b948aab709..871080a4cb 100644
--- a/package/libs/openssl/Config.in
+++ b/package/libs/openssl/Config.in
@@ -167,16 +167,24 @@ config OPENSSL_WITH_CAMELLIA
 
 config OPENSSL_WITH_IDEA
 	bool
-	prompt "Enable IDEA cipher support"
+	default y if !SMALL_FLASH
+	prompt "Enable IDEA cipher support (needs legacy provider)"
 	help
 		IDEA is a block cipher with 128-bit keys.
+		To use the cipher, one must install the libopenssl-legacy
+		package, using a main libopenssl package compiled with this
+		option enabled as well.
 
 config OPENSSL_WITH_SEED
 	bool
-	prompt "Enable SEED cipher support"
+	default y if !SMALL_FLASH
+	prompt "Enable SEED cipher support (needs legacy provider)"
 	help
 		SEED is a block cipher with 128-bit keys broadly used in
 		South Korea, but seldom found elsewhere.
+		To use the cipher, one must install the libopenssl-legacy
+		package, using a main libopenssl package compiled with this
+		option enabled as well.
 
 config OPENSSL_WITH_SM234
 	bool
@@ -197,11 +205,21 @@ config OPENSSL_WITH_BLAKE2
 
 config OPENSSL_WITH_MDC2
 	bool
-	prompt "Enable MDC2 digest support"
+	default y if !SMALL_FLASH
+	prompt "Enable MDC2 digest support (needs legacy provider)"
+	help
+		To use the digest, one must install the libopenssl-legacy
+		package, using a main libopenssl package compiled with this
+		option enabled as well.
 
 config OPENSSL_WITH_WHIRLPOOL
 	bool
-	prompt "Enable Whirlpool digest support"
+	default y if !SMALL_FLASH
+	prompt "Enable Whirlpool digest support (needs legacy provider)"
+	help
+		To use the digest, one must install the libopenssl-legacy
+		package, using a main libopenssl package compiled with this
+		option enabled as well.
 
 config OPENSSL_WITH_COMPRESSION
 	bool
diff --git a/package/libs/openssl/Makefile b/package/libs/openssl/Makefile
index 66872d5436..add3eb7db6 100644
--- a/package/libs/openssl/Makefile
+++ b/package/libs/openssl/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=openssl
 PKG_VERSION:=3.0.8
-PKG_RELEASE:=6
+PKG_RELEASE:=7
 PKG_BUILD_FLAGS:=no-mips16 gc-sections
 
 PKG_BUILD_PARALLEL:=1
@@ -64,7 +64,7 @@ PKG_CONFIG_DEPENDS:= \
 	CONFIG_OPENSSL_WITH_WHIRLPOOL
 
 include $(INCLUDE_DIR)/package.mk
-include $(INCLUDE_DIR)/openssl-engine.mk
+include $(INCLUDE_DIR)/openssl-module.mk
 
 ifneq ($(CONFIG_CCACHE),)
 HOSTCC=$(HOSTCC_NOCACHE)
@@ -129,8 +129,8 @@ endef
 
 define Package/libopenssl-conf/conffiles
 /etc/ssl/openssl.cnf
-$(if $(CONFIG_OPENSSL_ENGINE_BUILTIN_DEVCRYPTO),/etc/ssl/engines.cnf.d/devcrypto.cnf)
-$(if $(CONFIG_OPENSSL_ENGINE_BUILTIN_PADLOCK),/etc/ssl/engines.cnf.d/padlock.cnf)
+$(if $(CONFIG_OPENSSL_ENGINE_BUILTIN_DEVCRYPTO),/etc/ssl/modules.cnf.d/devcrypto.cnf)
+$(if $(CONFIG_OPENSSL_ENGINE_BUILTIN_PADLOCK),/etc/ssl/modules.cnf.d/padlock.cnf)
 endef
 
 define Package/libopenssl-conf/description
@@ -162,6 +162,20 @@ $(if $(CONFIG_OPENSSL_ENGINE_BUILTIN_PADLOCK),add_engine_config padlock)
 endef
 endif
 
+$(eval $(call Package/openssl/add-provider,legacy))
+define Package/libopenssl-legacy
+  $(call Package/openssl/Default)
+  $(call Package/openssl/module/Default)
+  TITLE:=OpenSSL legacy provider
+endef
+
+define Package/libopenssl-legacy/description
+The OpenSSL legacy provider supplies OpenSSL implementations of algorithms that
+have been deemed legacy. Such algorithms have commonly fallen out of use, have
+been deemed insecure by the cryptography community, or something similar.  See
+https://www.openssl.org/docs/man3.0/man7/OSSL_PROVIDER-legacy.html
+endef
+
 $(eval $(call Package/openssl/add-engine,afalg))
 define Package/libopenssl-afalg
   $(call Package/openssl/Default)
@@ -174,7 +188,7 @@ endef
 define Package/libopenssl-afalg/description
 This package adds an engine that enables hardware acceleration
 through the AF_ALG kernel interface.
-See https://www.openssl.org/docs/man1.1.1/man5/config.html#Engine-Configuration-Module
+See https://www.openssl.org/docs/man3.0/man5/config.html#Engine-Configuration
 and https://openwrt.org/docs/techref/hardware/cryptographic.hardware.accelerators
 The engine_id is "afalg"
 endef
@@ -190,7 +204,7 @@ endef
 define Package/libopenssl-devcrypto/description
 This package adds an engine that enables hardware acceleration
 through the /dev/crypto kernel interface.
-See https://www.openssl.org/docs/man1.1.1/man5/config.html#Engine-Configuration-Module
+See https://www.openssl.org/docs/man3.0/man5/config.html#Engine-Configuration
 and https://openwrt.org/docs/techref/hardware/cryptographic.hardware.accelerators
 The engine_id is "devcrypto"
 endef
@@ -206,7 +220,7 @@ endef
 
 define Package/libopenssl-padlock/description
 This package adds an engine that enables VIA Padlock hardware acceleration.
-See https://www.openssl.org/docs/man1.1.1/man5/config.html#Engine-Configuration-Module
+See https://www.openssl.org/docs/man3.0/man5/config.html#Engine-Configuration
 and https://openwrt.org/docs/techref/hardware/cryptographic.hardware.accelerators
 The engine_id is "padlock"
 endef
@@ -403,16 +417,16 @@ define Package/libopenssl/install
 endef
 
 define Package/libopenssl-conf/install
-	$(INSTALL_DIR) $(1)/etc/ssl/engines.cnf.d $(1)/etc/config $(1)/etc/init.d
+	$(INSTALL_DIR) $(1)/etc/ssl/modules.cnf.d $(1)/etc/config $(1)/etc/init.d
 	$(CP) $(PKG_INSTALL_DIR)/etc/ssl/openssl.cnf $(1)/etc/ssl/
 	$(INSTALL_BIN) ./files/openssl.init $(1)/etc/init.d/openssl
 	$(SED) 's!%ENGINES_DIR%!/usr/lib/$(ENGINES_DIR)!' $(1)/etc/init.d/openssl
 	touch $(1)/etc/config/openssl
 	$(if $(CONFIG_OPENSSL_ENGINE_BUILTIN_DEVCRYPTO),
-		$(CP) ./files/devcrypto.cnf $(1)/etc/ssl/engines.cnf.d/
+		$(CP) ./files/devcrypto.cnf $(1)/etc/ssl/modules.cnf.d/
 		echo -e "config engine 'devcrypto'\n\toption enabled '1'" >> $(1)/etc/config/openssl)
 	$(if $(CONFIG_OPENSSL_ENGINE_BUILTIN_PADLOCK),
-		$(CP) ./files/padlock.cnf $(1)/etc/ssl/engines.cnf.d/
+		$(CP) ./files/padlock.cnf $(1)/etc/ssl/modules.cnf.d/
 		echo -e "\nconfig engine 'padlock'\n\toption enabled '1'" >> $(1)/etc/config/openssl)
 endef
 
@@ -425,5 +439,6 @@ $(eval $(call BuildPackage,libopenssl))
 $(eval $(call BuildPackage,libopenssl-conf))
 $(eval $(call BuildPackage,libopenssl-afalg))
 $(eval $(call BuildPackage,libopenssl-devcrypto))
+$(eval $(call BuildPackage,libopenssl-legacy))
 $(eval $(call BuildPackage,libopenssl-padlock))
 $(eval $(call BuildPackage,openssl-util))
diff --git a/package/libs/openssl/files/afalg.cnf b/package/libs/openssl/files/afalg.cnf
index 4f573d757c..fd206361bf 100644
--- a/package/libs/openssl/files/afalg.cnf
+++ b/package/libs/openssl/files/afalg.cnf
@@ -1,3 +1,3 @@
-[afalg]
+[afalg_sect]
 default_algorithms = ALL
 
diff --git a/package/libs/openssl/files/devcrypto.cnf b/package/libs/openssl/files/devcrypto.cnf
index 8afd9b1b00..91d0eee17f 100644
--- a/package/libs/openssl/files/devcrypto.cnf
+++ b/package/libs/openssl/files/devcrypto.cnf
@@ -1,4 +1,4 @@
-[devcrypto]
+[devcrypto_sect]
 # Leave this alone and configure algorithms with CIPERS/DIGESTS below
 default_algorithms = ALL
 
diff --git a/package/libs/openssl/files/legacy.cnf b/package/libs/openssl/files/legacy.cnf
new file mode 100644
index 0000000000..4c20617444
--- /dev/null
+++ b/package/libs/openssl/files/legacy.cnf
@@ -0,0 +1,3 @@
+[legacy_sect]
+activate = 1
+
diff --git a/package/libs/openssl/files/openssl.init b/package/libs/openssl/files/openssl.init
index f895b9878c..1c1e8745ff 100755
--- a/package/libs/openssl/files/openssl.init
+++ b/package/libs/openssl/files/openssl.init
@@ -1,11 +1,25 @@
 #!/bin/sh /etc/rc.common
 
 START=13
-ENGINES_CNF_D="/etc/ssl/engines.cnf.d"
-ENGINES_CNF="/var/etc/ssl/engines.cnf"
-ENGINES_DIR="%ENGINES_DIR%"
+ENGINES_CNF=/var/etc/ssl/engines.cnf
+ENGINES_DIR=%ENGINES_DIR%
+MODULES_DIR=/usr/lib/ossl-modules
+PROVIDERS_CNF=/var/etc/ssl/providers.cnf
 
-config_engine() {
+#1: cnf file
+write_cnf_header() {
+	mkdir -p "$(dirname "$1")" && \
+	echo "# This file is automatically generated from /etc/config/openssl." >"$1" || {
+		echo "Error writing to $1."
+		return 1
+	}
+}
+
+
+#1: module name
+#2: output cnf file
+#3: module.so
+enable_module() {
 	local builtin enabled force
 
 	config_get_bool builtin "$1" builtin 0
@@ -13,30 +27,46 @@ config_engine() {
 	config_get_bool force "$1" force 0
 
 	if [ "$enabled" = 0 ]; then
-		[ "$builtin" != 1 ] && return 1
-		echo "Engine $1 is built into the libcrypto library and can't be disabled through UCI." && \
+		[ "$builtin" = 0 ] && 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
+	elif ! grep -q "\\[ *$1_sect *]" /etc/ssl/modules.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."
+	elif [ ! -f "$3" ];then
+		echo "Skipping $1: $3 not found."
 		return 1
 	fi
-	echo Enabling engine "$1"
-	echo "$1=$1" >> "${ENGINES_CNF}"
+	echo "Enabling $1"
+	echo "$1=$1_sect" >>"$2"
+}
+
+config_engine() {
+	enable_module "$1" "$ENGINES_CNF" \
+		      "${ENGINES_DIR}/${1}.so"
+}
+
+config_provider() {
+	enable_module "$1" "$PROVIDERS_CNF" \
+		      "${MODULES_DIR}/${1}.so"
 }
 
 start() {
-	mkdir -p "$(dirname "${ENGINES_CNF}")" || exit 1
-	echo Generating engines.cnf
-	echo "# This file is automatically generated from /etc/config/openssl." \
-	      > "${ENGINES_CNF}" || \
-	      { echo Error writing ${ENGINES_CNF} >&2; exit 1; }
+	local ret=0
+
         config_load openssl
-	config_foreach config_engine engine
+
+	echo Generating engines.cnf
+	write_cnf_header "${ENGINES_CNF}" && \
+	config_foreach config_engine engine || ret=$?
+
+	echo Generating providers.cnf
+	write_cnf_header "${PROVIDERS_CNF}" && \
+	config_foreach config_provider provider || ret=$?
+
+	return $ret
 }
diff --git a/package/libs/openssl/files/padlock.cnf b/package/libs/openssl/files/padlock.cnf
index ef91079e5d..f4085d907b 100644
--- a/package/libs/openssl/files/padlock.cnf
+++ b/package/libs/openssl/files/padlock.cnf
@@ -1,3 +1,3 @@
-[padlock]
+[padlock_sect]
 default_algorithms = ALL
 
diff --git a/package/libs/openssl/patches/150-openssl.cnf-add-engines-conf.patch b/package/libs/openssl/patches/150-openssl.cnf-add-engines-conf.patch
index b1ec0cae71..9fe9cdf590 100644
--- a/package/libs/openssl/patches/150-openssl.cnf-add-engines-conf.patch
+++ b/package/libs/openssl/patches/150-openssl.cnf-add-engines-conf.patch
@@ -10,20 +10,32 @@ Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>
 
 --- a/apps/openssl.cnf
 +++ b/apps/openssl.cnf
-@@ -30,6 +30,16 @@ oid_section = new_oids
- # (Alternatively, use a configuration file that has only
- # X.509v3 extensions in its main [= default] section.)
+@@ -52,10 +52,13 @@ tsa_policy3 = 1.2.3.4.5.7
  
-+openssl_conf=openssl_conf
+ [openssl_init]
+ providers = provider_sect
++engines = engines_sect
+ 
+ # List of providers to load
+ [provider_sect]
+ default = default_sect
++.include /var/etc/ssl/providers.cnf
 +
-+[openssl_conf]
-+engines=engines
+ # The fips section name should match the section name inside the
+ # included fipsmodule.cnf.
+ # fips = fips_sect
+@@ -69,7 +72,13 @@ default = default_sect
+ # OpenSSL may not work correctly which could lead to significant system
+ # problems including inability to remotely access the system.
+ [default_sect]
+-# activate = 1
++activate = 1
 +
-+[engines]
++[engines_sect]
 +.include /var/etc/ssl/engines.cnf
 +
-+.include /etc/ssl/engines.cnf.d
++.include /etc/ssl/modules.cnf.d
 +
- [ new_oids ]
- # We can add new OIDs in here for use by 'ca', 'req' and 'ts'.
- # Add a simple OID like this:
+ 
+ 
+ ####################################################################