freeradius2: relax SSL version checks

Merge upstream commit 5ae2a70a13 to relax the
SSL library version check at runtime.

The objective is to avoid the need for rebuilding freeradius2 whenever we push
binary updates for libopenssl. See https://dev.openwrt.org/ticket/18169 for
reference.

Please backport this change to the for-14.07 branch as well.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

net/freeradius2/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=freeradius2
 PKG_VERSION:=2.2.5
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=freeradius-server-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=ftp://ftp.freeradius.org/pub/freeradius/

net/freeradius2/patches/011-upstram-relax-ssl-version-checks.patch

@@ -0,0 +1,62 @@
+From 5ae2a70a135062a025d8fabc104eeae3a2c53a7a Mon Sep 17 00:00:00 2001
+From: Arran Cudbard-Bell <a.cudbardb@freeradius.org>
+Date: Tue, 17 Jun 2014 10:09:24 +0100
+Subject: [PATCH] Relax libssl checks
+
+---
+ src/main/version.c |   35 ++++++++++++++++++++++++++++-------
+ 1 file changed, 28 insertions(+), 7 deletions(-)
+
+--- a/src/main/version.c
++++ b/src/main/version.c
+@@ -34,7 +34,12 @@ RCSID("$Id: af82d4126a65d94929c22f44da2b
+ 
+ static long ssl_built = OPENSSL_VERSION_NUMBER;
+ 
+-/** Check build and linked versions of OpenSSL match
++/** Check built and linked versions of OpenSSL match
++ *
++ * OpenSSL version number consists of:
++ * MMNNFFPPS: major minor fix patch status
++ *
++ * Where status >= 0 && < 10 means beta, and status 10 means release.
+  *
+  * Startup check for whether the linked version of OpenSSL matches the
+  * version the server was built against.
+@@ -54,14 +59,30 @@ int ssl_check_version(int allow_vulnerab
+ 
+ 	ssl_linked = SSLeay();
+ 
+-	if (ssl_linked != ssl_built) {
+-		radlog(L_ERR, "libssl version mismatch."
+-		       "  Built with: %lx\n  Linked: %lx",
+-		       (unsigned long) ssl_built,
+-		       (unsigned long) ssl_linked);
++	/*
++	 *	Status mismatch always triggers error.
++	 */
++	if ((ssl_linked & 0x00000000f) != (ssl_built & 0x00000000f)) {
++	mismatch:
++		radlog(L_ERR, "libssl version mismatch.  built: %lx linked: %lx",
++		       (unsigned long) ssl_built, (unsigned long) ssl_linked);
+ 
+ 		return -1;
+-	};
++	}
++
++	/*
++	 *	Use the OpenSSH approach and relax fix checks after version
++	 *	1.0.0 and only allow moving backwards within a patch
++	 *	series.
++	 */
++	if (ssl_built & 0xff) {
++		if ((ssl_built & 0xffff) != (ssl_linked & 0xffff) ||
++		    (ssl_built & 0x0000ff) > (ssl_linked & 0x0000ff)) goto mismatch;
++	/*
++	 *	Before 1.0.0 we require the same major minor and fix version
++	 *	and ignore the patch number.
++	 */
++	} else if ((ssl_built & 0xffffff) != (ssl_linked & 0xffffff)) goto mismatch;
+ 
+ 	if (!allow_vulnerable) {
+ 		/* Check for bad versions */