From 3b426a8b09c127941b29600271184583f2199a19 Mon Sep 17 00:00:00 2001
From: Mark Michelson <mmichelson@digium.com>
Date: Thu, 4 Feb 2016 16:17:55 -0600
Subject: [PATCH] Check for OpenSSL defines before trying to use them.
The SSL_OP_NO_TLSv1_1 and SSL_OP_NO_TLSv1_2 defines did not exist prior
to OpenSSL version 1.0.1. A recent commit attempts to, by default, set
these options, which can cause problems on systems with older OpenSSL
installations.
This commit adds a configure script check for those defines and will not
attempt to make use of those if they do not exist. We will print a
warning urging the user to upgrade their OpenSSL installation if those
defines are not present.
Change-Id: I6a2eb9a43fd0738b404d8f6f2cf4b5c22d9d752d
---
configure | 108 +++++++++++++++++++++++++++++--
configure.ac | 6 ++
include/asterisk/autoconfig.h.in | 6 ++
main/tcptls.c | 5 ++
4 files changed, 120 insertions(+), 5 deletions(-)
diff --git a/configure b/configure
index fc7613120e..c382032463 100755
--- a/configure
+++ b/configure
@@ -651,6 +651,8 @@ PBX_MSG_NOSIGNAL
PBX_IXJUSER
GMIME_LIBS
GMIME_CFLAGS
+PBX_SSL_OP_NO_TLSV1_2
+PBX_SSL_OP_NO_TLSV1_1
OPENH323_BUILD
OPENH323_SUFFIX
OPENH323_LIBDIR
@@ -13695,7 +13697,7 @@ else
We can't simply define LARGE_OFF_T to be 9223372036854775807,
since some C++ compilers masquerading as C compilers
incorrectly reject 9223372036854775807. */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
&& LARGE_OFF_T % 2147483647 == 1)
? 1 : -1];
@@ -13741,7 +13743,7 @@ else
We can't simply define LARGE_OFF_T to be 9223372036854775807,
since some C++ compilers masquerading as C compilers
incorrectly reject 9223372036854775807. */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
&& LARGE_OFF_T % 2147483647 == 1)
? 1 : -1];
@@ -13765,7 +13767,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
We can't simply define LARGE_OFF_T to be 9223372036854775807,
since some C++ compilers masquerading as C compilers
incorrectly reject 9223372036854775807. */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
&& LARGE_OFF_T % 2147483647 == 1)
? 1 : -1];
@@ -13810,7 +13812,7 @@ else
We can't simply define LARGE_OFF_T to be 9223372036854775807,
since some C++ compilers masquerading as C compilers
incorrectly reject 9223372036854775807. */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
&& LARGE_OFF_T % 2147483647 == 1)
? 1 : -1];
@@ -13834,7 +13836,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
We can't simply define LARGE_OFF_T to be 9223372036854775807,
since some C++ compilers masquerading as C compilers
incorrectly reject 9223372036854775807. */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
&& LARGE_OFF_T % 2147483647 == 1)
? 1 : -1];
@@ -30763,6 +30765,102 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
+if test "$PBX_OPENSSL" = "1";
+then
+
+ if test "x${PBX_SSL_OP_NO_TLSV1_1}" != "x1"; then
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_OP_NO_TLSv1_1 in openssl/ssl.h" >&5
+$as_echo_n "checking for SSL_OP_NO_TLSv1_1 in openssl/ssl.h... " >&6; }
+ saved_cppflags="${CPPFLAGS}"
+ if test "x${SSL_OP_NO_TLSV1_1_DIR}" != "x"; then
+ SSL_OP_NO_TLSV1_1_INCLUDE="-I${SSL_OP_NO_TLSV1_1_DIR}/include"
+ fi
+ CPPFLAGS="${CPPFLAGS} ${SSL_OP_NO_TLSV1_1_INCLUDE}"
+
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+ #include <openssl/ssl.h>
+int
+main ()
+{
+#if defined(SSL_OP_NO_TLSv1_1)
+ int foo = 0;
+ #else
+ int foo = bar;
+ #endif
+ 0
+
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+ PBX_SSL_OP_NO_TLSV1_1=1
+
+$as_echo "#define HAVE_SSL_OP_NO_TLSV1_1 1" >>confdefs.h
+
+
+
+else
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+ CPPFLAGS="${saved_cppflags}"
+ fi
+
+
+
+ if test "x${PBX_SSL_OP_NO_TLSV1_2}" != "x1"; then
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_OP_NO_TLSv1_2 in openssl/ssl.h" >&5
+$as_echo_n "checking for SSL_OP_NO_TLSv1_2 in openssl/ssl.h... " >&6; }
+ saved_cppflags="${CPPFLAGS}"
+ if test "x${SSL_OP_NO_TLSV1_2_DIR}" != "x"; then
+ SSL_OP_NO_TLSV1_2_INCLUDE="-I${SSL_OP_NO_TLSV1_2_DIR}/include"
+ fi
+ CPPFLAGS="${CPPFLAGS} ${SSL_OP_NO_TLSV1_2_INCLUDE}"
+
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+ #include <openssl/ssl.h>
+int
+main ()
+{
+#if defined(SSL_OP_NO_TLSv1_2)
+ int foo = 0;
+ #else
+ int foo = bar;
+ #endif
+ 0
+
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+ PBX_SSL_OP_NO_TLSV1_2=1
+
+$as_echo "#define HAVE_SSL_OP_NO_TLSV1_2 1" >>confdefs.h
+
+
+
+else
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+ CPPFLAGS="${saved_cppflags}"
+ fi
+
+
+fi
+
if test "x${PBX_SRTP}" != "x1" -a "${USE_SRTP}" != "no"; then
pbxlibdir=""
diff --git a/configure.ac b/configure.ac
index e7b7e57810..723b0af0f2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2302,6 +2302,12 @@ then
AST_C_DECLARE_CHECK([OPENSSL_ECDH_AUTO], [SSL_CTX_set_ecdh_auto], [openssl/ssl.h])
fi
+if test "$PBX_OPENSSL" = "1";
+then
+ AST_C_DEFINE_CHECK([SSL_OP_NO_TLSV1_1], [SSL_OP_NO_TLSv1_1], [openssl/ssl.h])
+ AST_C_DEFINE_CHECK([SSL_OP_NO_TLSV1_2], [SSL_OP_NO_TLSv1_2], [openssl/ssl.h])
+fi
+
AST_EXT_LIB_CHECK([SRTP], [srtp], [srtp_init], [srtp/srtp.h])
if test "$PBX_SRTP" = "1";
diff --git a/include/asterisk/autoconfig.h.in b/include/asterisk/autoconfig.h.in
index d86ba4a6aa..a9179bae67 100644
--- a/include/asterisk/autoconfig.h.in
+++ b/include/asterisk/autoconfig.h.in
@@ -832,6 +832,12 @@
/* Define to 1 if you have the ISDN SS7 library. */
#undef HAVE_SS7
+/* Define if your system has the SSL_OP_NO_TLSV1_1 headers. */
+#undef HAVE_SSL_OP_NO_TLSV1_1
+
+/* Define if your system has the SSL_OP_NO_TLSV1_2 headers. */
+#undef HAVE_SSL_OP_NO_TLSV1_2
+
/* Define to 1 if `stat' has the bug that it succeeds when given the
zero-length file name argument. */
#undef HAVE_STAT_EMPTY_STRING_BUG
diff --git a/main/tcptls.c b/main/tcptls.c
index 3941794630..f56e0aa70c 100644
--- a/main/tcptls.c
+++ b/main/tcptls.c
@@ -875,12 +875,17 @@ static int __ssl_setup(struct ast_tls_config *cfg, int client)
if (ast_test_flag(&cfg->flags, AST_SSL_DISABLE_TLSV1)) {
ssl_opts |= SSL_OP_NO_TLSv1;
}
+#if defined(HAVE_SSL_OP_NO_TLSV1_1) && defined(HAVE_SSL_OP_NO_TLSV1_2)
if (ast_test_flag(&cfg->flags, AST_SSL_DISABLE_TLSV11)) {
ssl_opts |= SSL_OP_NO_TLSv1_1;
}
if (ast_test_flag(&cfg->flags, AST_SSL_DISABLE_TLSV12)) {
ssl_opts |= SSL_OP_NO_TLSv1_2;
}
+#else
+ ast_log(LOG_WARNING, "Your version of OpenSSL leaves you potentially vulnerable "
+ "to the SSL BEAST attack. Please upgrade to OpenSSL 1.0.1 or later\n");
+#endif
SSL_CTX_set_options(cfg->ssl_ctx, ssl_opts);
--
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