openconnect: Fix DTLS with OpenSSL
Backported upstream patches that fix this. Removed local patch that fixes libp11 with version 0.4.7, which is not used anymore. Upstream has a different solution. License fixes and Makefile cleanups. Signed-off-by: Rosen Penev <rosenp@gmail.com>
This commit is contained in:
Rosen Penev
parent
b4015743ce
commit
6dbbc17b1f
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@ -9,18 +9,20 @@ include $(TOPDIR)/rules.mk
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PKG_NAME:=openconnect
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PKG_VERSION:=8.03
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PKG_RELEASE:=1
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PKG_USE_MIPS16:=0
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PKG_RELEASE:=2
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PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
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PKG_SOURCE_URL:=ftp://ftp.infradead.org/pub/openconnect/
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PKG_HASH:=908cff9b1ce266b6bb7f969a7f62723543ab94719ba3c95a150fe3894cbc9ef2
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PKG_LICENSE:=LGPLv2.1+
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PKG_LICENSE:=LGPL-2.1-or-later
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PKG_LICENSE_FILES:=COPYING.LGPL
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PKG_CONFIG_DEPENDS:= \
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CONFIG_OPENCONNECT_GNUTLS \
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CONFIG_OPENCONNECT_OPENSSL \
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PKG_USE_MIPS16:=0
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include $(INCLUDE_DIR)/package.mk
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@ -34,7 +36,7 @@ define Package/openconnect
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DEPENDS:=+libxml2 +kmod-tun +resolveip +vpnc-scripts +OPENCONNECT_OPENSSL:libopenssl +OPENCONNECT_OPENSSL:p11-kit +OPENCONNECT_OPENSSL:libp11 +OPENCONNECT_GNUTLS:libgnutls +OPENCONNECT_GNUTLS:libtasn1 +OPENCONNECT_STOKEN:libstoken
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TITLE:=OpenConnect VPN client (Cisco AnyConnect and Juniper/Pulse compatible)
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MAINTAINER:=Nikos Mavrogiannopoulos <n.mavrogiannopoulos@gmail.com>
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URL:=http://www.infradead.org/openconnect/
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URL:=https://www.infradead.org/openconnect/
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SUBMENU:=VPN
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endef
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@ -1,50 +0,0 @@
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From 03ecd34e0137b3f0bf0d2fc3ab7f7d8b3682785e Mon Sep 17 00:00:00 2001
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From: Yousong Zhou <yszhou4tech@gmail.com>
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Date: Thu, 14 Dec 2017 18:03:35 +0800
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Subject: [PATCH] Fix compilation with libp11 version >= 0.4.7
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libp11 0.4.7 renamed then dropped macro definition in commits
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4f0fce4: Error reporting fixes
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e4c641b: PKCS11 errors separated into P11 and CKR
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This change assumes that libp11 will restore compatibility by bringing
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back old forms of macro definition
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Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
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---
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openssl-pkcs11.c | 18 ++++++++++++++++++
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1 file changed, 18 insertions(+)
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diff --git a/openssl-pkcs11.c b/openssl-pkcs11.c
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index 61da123..ba7e491 100644
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--- a/openssl-pkcs11.c
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+++ b/openssl-pkcs11.c
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@@ -30,6 +30,24 @@
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#include <libp11.h>
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#include <p11-kit/pkcs11.h>
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+#ifndef ERR_LIB_PKCS11
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+# if defined(ERR_LIB_CKR)
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+# define ERR_LIB_PKCS11 ERR_LIB_CKR
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+# elif defined(ERR_LIB_USER)
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+# define ERR_LIB_PKCS11 ERR_LIB_USER
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+# else
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+# error undefined macro ERR_LIB_PKCS11
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+# endif
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+#endif
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+
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+#ifndef PKCS11_F_PKCS11_LOGIN
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+# if defined(CKR_F_PKCS11_LOGIN)
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+# define PKCS11_F_PKCS11_LOGIN CKR_F_PKCS11_LOGIN
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+# else
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+# error undefined macro PKCS11_F_PKCS11_LOGIN
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+# endif
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+#endif
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+
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static PKCS11_CTX *pkcs11_ctx(struct openconnect_info *vpninfo)
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{
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PKCS11_CTX *ctx;
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--
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1.8.3.1
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@ -0,0 +1,75 @@
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From 460c060dda115bc8066bb4b955453c673459b6cc Mon Sep 17 00:00:00 2001
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From: Rosen Penev <rosenp@gmail.com>
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Date: Sun, 9 Jun 2019 23:36:53 -0700
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Subject: [PATCH] Fix compilation without deprecated OpenSSL 1.1 APIs
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Initialization and deinitialization is deprecated.
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Signed-off-by: Rosen Penev <rosenp@gmail.com>
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---
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library.c | 4 ++++
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openssl.c | 2 ++
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tests/bad_dtls_test.c | 4 ++++
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3 files changed, 10 insertions(+)
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diff --git a/library.c b/library.c
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index 0e3d05e6..e45e93a2 100644
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--- a/library.c
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+++ b/library.c
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@@ -38,6 +38,10 @@
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#include "gnutls.h"
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#endif
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+#if defined(OPENCONNECT_OPENSSL)
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+#include <openssl/bio.h>
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+#endif
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+
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struct openconnect_info *openconnect_vpninfo_new(const char *useragent,
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openconnect_validate_peer_cert_vfn validate_peer_cert,
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openconnect_write_new_config_vfn write_new_config,
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diff --git a/openssl.c b/openssl.c
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index 2b1f07bd..e505f49a 100644
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--- a/openssl.c
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+++ b/openssl.c
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@@ -1879,10 +1879,12 @@ int openconnect_init_ssl(void)
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if (ret)
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return ret;
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#endif
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+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
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SSL_library_init();
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ERR_clear_error();
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SSL_load_error_strings();
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OpenSSL_add_all_algorithms();
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+#endif
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return 0;
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}
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diff --git a/tests/bad_dtls_test.c b/tests/bad_dtls_test.c
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index ac8d3f1e..c123c8f8 100644
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--- a/tests/bad_dtls_test.c
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+++ b/tests/bad_dtls_test.c
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@@ -752,8 +752,10 @@ int main(int argc, char *argv[])
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int ret;
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int i;
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+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
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SSL_library_init();
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SSL_load_error_strings();
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+#endif
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RAND_bytes(session_id, sizeof(session_id));
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RAND_bytes(master_secret, sizeof(master_secret));
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@@ -910,8 +912,10 @@ int main(int argc, char *argv[])
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printf("Cisco BadDTLS test: FAILED\n");
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}
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+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
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ERR_free_strings();
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EVP_cleanup();
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+#endif
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return testresult?0:1;
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}
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--
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2.17.1
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@ -0,0 +1,139 @@
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From afb6442533dc7475ed61642c3f5b295db1e6f561 Mon Sep 17 00:00:00 2001
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From: Rosen Penev <rosenp@gmail.com>
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Date: Sun, 9 Jun 2019 23:40:21 -0700
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Subject: [PATCH] Fix DTLS bug when lacking deprecated APIs
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HAVE_DTLS12 is for DTLSv1_method. This causes dtls_method to be NULL and
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crash.
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[dwmw2: Rework it quite a bit more]
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Signed-off-by: Rosen Penev <rosenp@gmail.com>
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Signed-off-by: David Woodhouse <dwmw2@infradead.org>
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---
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configure.ac | 17 ++++++++++++++---
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openssl-dtls.c | 49 ++++++++++++++++++++++++++-----------------------
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2 files changed, 40 insertions(+), 26 deletions(-)
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diff --git a/configure.ac b/configure.ac
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index 02096c51..f7557933 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -455,11 +455,22 @@ case "$ssl_library" in
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AC_DEFINE(HAVE_DTLS1_STOP_TIMER, [1], [OpenSSL has dtls1_stop_timer() function])],
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[AC_MSG_RESULT(no)])
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- AC_MSG_CHECKING([for DTLSv1_2_client_method() in OpenSSL])
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+ # DTLS_client_method() and DTLSv1_2_client_method() were both added between
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+ # OpenSSL v1.0.1 and v1.0.2. DTLSV1.2_client_method() was later deprecated
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+ # in v1.1.0 so we use DTLS_client_method() as our check for DTLSv1.2 support
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+ # and that's what we actually use in openssl-dtls.c too.
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+ AC_MSG_CHECKING([for DTLS_client_method() in OpenSSL])
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AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <openssl/ssl.h>],
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- [DTLSv1_2_client_method();])],
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+ [DTLS_client_method();])],
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[AC_MSG_RESULT(yes)
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- AC_DEFINE(HAVE_DTLS12, [1], [OpenSSL has DTLSv1_2_client_method() function])],
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+ AC_DEFINE(HAVE_DTLS12, [1], [OpenSSL has DTLS_client_method() function])],
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+ [AC_MSG_RESULT(no)])
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+
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+ AC_MSG_CHECKING([for SSL_CTX_set_min_proto_version() in OpenSSL])
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+ AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <openssl/ssl.h>],
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+ [SSL_CTX_set_min_proto_version((void *)0, 0);])],
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+ [AC_MSG_RESULT(yes)
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+ AC_DEFINE(HAVE_SSL_CTX_PROTOVER, [1], [OpenSSL has SSL_CTX_set_min_proto_version() function])],
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[AC_MSG_RESULT(no)])
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AC_CHECK_FUNC(HMAC_CTX_copy,
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diff --git a/openssl-dtls.c b/openssl-dtls.c
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index 5086440f..9e3c5d46 100644
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--- a/openssl-dtls.c
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+++ b/openssl-dtls.c
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@@ -332,6 +332,7 @@ int start_dtls_handshake(struct openconnect_info *vpninfo, int dtls_fd)
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const char *cipher = vpninfo->dtls_cipher;
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#ifdef HAVE_DTLS12
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+ /* These things should never happen unless they're supported */
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if (vpninfo->cisco_dtls12) {
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dtlsver = DTLS1_2_VERSION;
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} else if (!strcmp(cipher, "OC-DTLS1_2-AES128-GCM")) {
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@@ -349,16 +350,16 @@ int start_dtls_handshake(struct openconnect_info *vpninfo, int dtls_fd)
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if (!vpninfo->dtls_ctx) {
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#ifdef HAVE_DTLS12
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+ /* If we can use SSL_CTX_set_min_proto_version, do so. */
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dtls_method = DTLS_client_method();
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#endif
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-#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
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+#ifndef HAVE_SSL_CTX_PROTOVER
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+ /* If !HAVE_DTLS12, dtlsver *MUST* be DTLS1_BAD_VER because it's set
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+ * at the top of the function and nothing can change it. */
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if (dtlsver == DTLS1_BAD_VER)
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dtls_method = DTLSv1_client_method();
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-#ifdef HAVE_DTLS12
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- else if (dtlsver == DTLS1_2_VERSION)
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- dtls_method = DTLSv1_2_client_method();
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-#endif
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#endif
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+
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vpninfo->dtls_ctx = SSL_CTX_new(dtls_method);
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if (!vpninfo->dtls_ctx) {
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vpn_progress(vpninfo, PRG_ERR,
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@@ -367,24 +368,26 @@ int start_dtls_handshake(struct openconnect_info *vpninfo, int dtls_fd)
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vpninfo->dtls_attempt_period = 0;
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return -EINVAL;
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}
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- if (dtlsver) {
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-#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
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- if (dtlsver == DTLS1_BAD_VER)
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- SSL_CTX_set_options(vpninfo->dtls_ctx, SSL_OP_CISCO_ANYCONNECT);
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-#else
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- if (!SSL_CTX_set_min_proto_version(vpninfo->dtls_ctx, dtlsver) ||
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- !SSL_CTX_set_max_proto_version(vpninfo->dtls_ctx, dtlsver)) {
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- vpn_progress(vpninfo, PRG_ERR,
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- _("Set DTLS CTX version failed\n"));
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- openconnect_report_ssl_errors(vpninfo);
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- SSL_CTX_free(vpninfo->dtls_ctx);
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- vpninfo->dtls_ctx = NULL;
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- vpninfo->dtls_attempt_period = 0;
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- return -EINVAL;
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- }
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+#ifdef HAVE_SSL_CTX_PROTOVER
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+ if (dtlsver &&
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+ (!SSL_CTX_set_min_proto_version(vpninfo->dtls_ctx, dtlsver) ||
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+ !SSL_CTX_set_max_proto_version(vpninfo->dtls_ctx, dtlsver))) {
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+ vpn_progress(vpninfo, PRG_ERR,
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+ _("Set DTLS CTX version failed\n"));
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+ openconnect_report_ssl_errors(vpninfo);
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+ SSL_CTX_free(vpninfo->dtls_ctx);
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+ vpninfo->dtls_ctx = NULL;
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+ vpninfo->dtls_attempt_period = 0;
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+ return -EINVAL;
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+ }
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+#else /* !HAVE_SSL_CTX_PROTOVER */
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+ /* If we used the legacy version-specific methods, we need the special
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+ * way to make TLSv1_client_method() do DTLS1_BAD_VER. */
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+ if (dtlsver == DTLS1_BAD_VER)
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+ SSL_CTX_set_options(vpninfo->dtls_ctx, SSL_OP_CISCO_ANYCONNECT);
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#endif
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#if defined (HAVE_DTLS12) && !defined(OPENSSL_NO_PSK)
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- } else {
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+ if (!dtlsver) {
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SSL_CTX_set_psk_client_callback(vpninfo->dtls_ctx, psk_callback);
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/* For PSK we override the DTLS master secret with one derived
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* from the HTTPS session. */
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@@ -401,9 +404,9 @@ int start_dtls_handshake(struct openconnect_info *vpninfo, int dtls_fd)
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}
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/* For SSL_CTX_set_cipher_list() */
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cipher = "PSK";
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-
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-#endif
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}
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+#endif /* OPENSSL_NO_PSK */
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+
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/* If we don't readahead, then we do short reads and throw
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away the tail of data packets. */
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SSL_CTX_set_read_ahead(vpninfo->dtls_ctx, 1);
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--
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2.17.1
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@ -0,0 +1,38 @@
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From 97cafd182f5a5c2d13f57d7faeac8432aea9bbf8 Mon Sep 17 00:00:00 2001
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From: David Woodhouse <dwmw2@infradead.org>
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Date: Mon, 10 Jun 2019 12:34:43 +0100
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Subject: [PATCH] Disable encrypt-then-mac where possible with DTLS and OpenSSL
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There is pain here. Just don't bother.
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Signed-off-by: David Woodhouse <dwmw2@infradead.org>
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---
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openssl-dtls.c | 12 +++++++++++-
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1 file changed, 11 insertions(+), 1 deletion(-)
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diff --git a/openssl-dtls.c b/openssl-dtls.c
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index 9e3c5d46..646bf71c 100644
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--- a/openssl-dtls.c
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+++ b/openssl-dtls.c
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@@ -406,7 +406,17 @@ int start_dtls_handshake(struct openconnect_info *vpninfo, int dtls_fd)
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cipher = "PSK";
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}
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#endif /* OPENSSL_NO_PSK */
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-
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+#ifdef SSL_OP_NO_ENCRYPT_THEN_MAC
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+ /* I'm fairly sure I wasn't lying when I said I had tested
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+ * https://github.com/openssl/openssl/commit/e23d5071ec4c7aa6bb2b
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+ * against GnuTLS both with and without EtM in 2016.
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+ * Nevertheless, in 2019 it seems to be failing to negotiate
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+ * at least for DTLS1_BAD_VER against ocserv with GnuTLS 3.6.7.
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+ * Just turn it off. Real Cisco servers don't do it for
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+ * DTLS1_BAD_VER, and we should be using GCM ciphersuites in
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+ * newer versions of DTLS anyway so it's irrelevant. */
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+ SSL_CTX_set_options(vpninfo->dtls_ctx, SSL_OP_NO_ENCRYPT_THEN_MAC);
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+#endif
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/* If we don't readahead, then we do short reads and throw
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away the tail of data packets. */
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SSL_CTX_set_read_ahead(vpninfo->dtls_ctx, 1);
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--
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2.17.1
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Reference in New Issue