From 2407b1edccc2f2d426333bd7cc1743c8e4da8dbd Mon Sep 17 00:00:00 2001 From: Eneas U de Queiroz Date: Tue, 12 Mar 2019 13:16:01 +0000 Subject: [PATCH] openssl: disable digests by default, misc fixes Openssh uses digest contexts across forks, which is not supported by the /dev/crypto engine. The speed of digests is usually not worth enabling them anyway. This changes the default of the DIGESTS option to NONE, so the user still has the option to enable them. Added another patch related to the use of encryption contexts across forks, that ignores a failure to close a previous open session when reinitializing a context, instead of failing the reinitialization. Added a link to the Cryptographic Hardware Accelerators document to the engine pacakges description, to provide more detailed instructions to configure the engines. Revert the removal of the OPENSSL_ENGINE_CRYPTO symbol, currently used by openssh. There is an open PR to update openssh; when merged, this symbol can be safely removed. Signed-off-by: Eneas U de Queiroz Signed-off-by: Hans Dedecker [refresh patches] --- package/libs/openssl/Config.in | 11 ++++- package/libs/openssl/Makefile | 5 ++- ...default-to-not-use-digests-in-engine.patch | 41 +++++++++++++++++++ ...to-ignore-error-when-closing-session.patch | 24 +++++++++++ 4 files changed, 79 insertions(+), 2 deletions(-) create mode 100644 package/libs/openssl/patches/500-e_devcrypto-default-to-not-use-digests-in-engine.patch create mode 100644 package/libs/openssl/patches/510-e_devcrypto-ignore-error-when-closing-session.patch diff --git a/package/libs/openssl/Config.in b/package/libs/openssl/Config.in index 235f38e787..ecb9eea389 100644 --- a/package/libs/openssl/Config.in +++ b/package/libs/openssl/Config.in @@ -269,7 +269,13 @@ config OPENSSL_ENGINE_BUILTIN_AFALG select PACKAGE_libopenssl-conf help This enables use of hardware acceleration through the - AF_ALG kenrel interface. + AF_ALG kernel interface. + +config OPENSSL_ENGINE_CRYPTO + # This symbol is deprecated. Currently it is used by the openssh package. + # Once openwrt/packages#8272 is merged, this can be safely removed. + bool + default OPENSSL_ENGINE_BUILTIN_DEVCRYPTO || PACKAGE_libopenssl-devcrypto config OPENSSL_ENGINE_BUILTIN_DEVCRYPTO bool @@ -279,6 +285,9 @@ config OPENSSL_ENGINE_BUILTIN_DEVCRYPTO help This enables use of hardware acceleration through OpenBSD Cryptodev API (/dev/crypto) interface. + Even though configuration is not strictly needed, it is worth seeing + https://openwrt.org/docs/techref/hardware/cryptographic.hardware.accelerators + for information on how to configure the engine. config OPENSSL_ENGINE_BUILTIN_PADLOCK bool diff --git a/package/libs/openssl/Makefile b/package/libs/openssl/Makefile index a9dd16f3e7..56e95af793 100644 --- a/package/libs/openssl/Makefile +++ b/package/libs/openssl/Makefile @@ -11,7 +11,7 @@ PKG_NAME:=openssl PKG_BASE:=1.1.1 PKG_BUGFIX:=b PKG_VERSION:=$(PKG_BASE)$(PKG_BUGFIX) -PKG_RELEASE:=2 +PKG_RELEASE:=3 PKG_USE_MIPS16:=0 ENGINES_DIR=engines-1.1 @@ -147,6 +147,7 @@ This package adds an engine that enables hardware acceleration through the AF_ALG kernel interface. To use it, you need to configure the engine in /etc/ssl/openssl.cnf See https://www.openssl.org/docs/man1.1.1/man5/config.html#Engine-Configuration-Module +and https://openwrt.org/docs/techref/hardware/cryptographic.hardware.accelerators The engine_id is "afalg" endef @@ -163,6 +164,7 @@ This package adds an engine that enables hardware acceleration through the /dev/crypto kernel interface. To use it, you need to configure the engine in /etc/ssl/openssl.cnf See https://www.openssl.org/docs/man1.1.1/man5/config.html#Engine-Configuration-Module +and https://openwrt.org/docs/techref/hardware/cryptographic.hardware.accelerators The engine_id is "devcrypto" endef @@ -178,6 +180,7 @@ define Package/libopenssl-padlock/description This package adds an engine that enables VIA Padlock hardware acceleration. To use it, you need to configure it in /etc/ssl/openssl.cnf. See https://www.openssl.org/docs/man1.1.1/man5/config.html#Engine-Configuration-Module +and https://openwrt.org/docs/techref/hardware/cryptographic.hardware.accelerators The engine_id is "padlock" endef diff --git a/package/libs/openssl/patches/500-e_devcrypto-default-to-not-use-digests-in-engine.patch b/package/libs/openssl/patches/500-e_devcrypto-default-to-not-use-digests-in-engine.patch new file mode 100644 index 0000000000..bca198eb34 --- /dev/null +++ b/package/libs/openssl/patches/500-e_devcrypto-default-to-not-use-digests-in-engine.patch @@ -0,0 +1,41 @@ +From 5d3be6bc8ed7d73ab2c4d389fb0f0a03dacd04b1 Mon Sep 17 00:00:00 2001 +From: Eneas U de Queiroz +Date: Mon, 11 Mar 2019 09:29:13 -0300 +Subject: [PATCH] e_devcrypto: default to not use digests in engine + +Digests are almost always slower when using /dev/crypto because of the +cost of the context switches. Only for large blocks it is worth it. + +Also, when forking, the open context structures are duplicated, but the +internal kernel sessions are still shared between forks, which means an +update/close operation in one fork affects all processes using that +session. + +This affects digests, especially for HMAC, where the session with the +key hash is used as a source for subsequent operations. At least one +popular application does this across a fork. Disabling digests by +default will mitigate the problem, while still allowing the user to +turn them on if it is safe and fast enough. + +Signed-off-by: Eneas U de Queiroz + +--- a/engines/e_devcrypto.c ++++ b/engines/e_devcrypto.c +@@ -854,7 +854,7 @@ static void prepare_digest_methods(void) + for (i = 0, known_digest_nids_amount = 0; i < OSSL_NELEM(digest_data); + i++) { + +- selected_digests[i] = 1; ++ selected_digests[i] = 0; + + /* + * Check that the digest is usable +@@ -1074,7 +1074,7 @@ static const ENGINE_CMD_DEFN devcrypto_c + #ifdef IMPLEMENT_DIGEST + {DEVCRYPTO_CMD_DIGESTS, + "DIGESTS", +- "either ALL, NONE, or a comma-separated list of digests to enable [default=ALL]", ++ "either ALL, NONE, or a comma-separated list of digests to enable [default=NONE]", + ENGINE_CMD_FLAG_STRING}, + #endif + diff --git a/package/libs/openssl/patches/510-e_devcrypto-ignore-error-when-closing-session.patch b/package/libs/openssl/patches/510-e_devcrypto-ignore-error-when-closing-session.patch new file mode 100644 index 0000000000..fb69599aeb --- /dev/null +++ b/package/libs/openssl/patches/510-e_devcrypto-ignore-error-when-closing-session.patch @@ -0,0 +1,24 @@ +From b6e6d157367bae91a8015434769572e430257d40 Mon Sep 17 00:00:00 2001 +From: Eneas U de Queiroz +Date: Mon, 11 Mar 2019 10:15:14 -0300 +Subject: [PATCH] e_devcrypto: ignore error when closing session + +In cipher_init, ignore an eventual error when closing the previous +session. It may have been closed by another process after a fork. + +Signed-off-by: Eneas U de Queiroz + +--- a/engines/e_devcrypto.c ++++ b/engines/e_devcrypto.c +@@ -197,9 +197,8 @@ static int cipher_init(EVP_CIPHER_CTX *c + get_cipher_data(EVP_CIPHER_CTX_nid(ctx)); + + /* cleanup a previous session */ +- if (cipher_ctx->sess.ses != 0 && +- clean_devcrypto_session(&cipher_ctx->sess) == 0) +- return 0; ++ if (cipher_ctx->sess.ses != 0) ++ clean_devcrypto_session(&cipher_ctx->sess); + + cipher_ctx->sess.cipher = cipher_d->devcryptoid; + cipher_ctx->sess.keylen = cipher_d->keylen; -- 2.30.2