validate source of RADIUS packets

diff --git a/Changes b/Changes
index df49e0d..d4c668c 100644 (file)
--- a/Changes
+++ b/Changes
@@ -1,8 +1,9 @@
-* Fri Jan 20 2006 Brendan O'Dea <bod@optus.net> 2.1.16
+* Sat Feb 18 2006 Brendan O'Dea <bod@optus.net> 2.1.16
 - Send configured magic-no in LCP EchoReq when LCP is opened.
 - Correct addition of single IP to pool (Jonathan Yarden).
 - Handle LCP NAK of magic-number.
 - Ensure session changes from LCP ConfigReq/ConfigNak are sent to cluster.
+- Verify that RADIUS packets come from a configured server (Jonathan Yarden).
 
 * Mon Dec 19 2005 Brendan O'Dea <bod@optus.net> 2.1.15
 - Drop backtrace.

diff --git a/l2tpns.c b/l2tpns.c
index ecae249..804e1ad 100644 (file)
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -4,7 +4,7 @@
 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
 // vim: sw=8 ts=8
 
-char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.155 2006/01/19 20:55:03 bodea Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.156 2006/02/17 13:27:07 bodea Exp $";
 
 #include <arpa/inet.h>
 #include <assert.h>
@@ -3301,9 +3301,17 @@ static void mainloop(void)
                                        break;
 
                                case FD_TYPE_RADIUS: // RADIUS response
-                                       s = recv(radfds[d->index], buf, sizeof(buf), 0);
+                                       alen = sizeof(addr);
+                                       s = recvfrom(radfds[d->index], buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen);
                                        if (s >= 0 && config->cluster_iam_master)
-                                               processrad(buf, s, d->index);
+                                       {
+                                               if (addr.sin_addr.s_addr == config->radiusserver[0] ||
+                                                   addr.sin_addr.s_addr == config->radiusserver[1])
+                                                       processrad(buf, s, d->index);
+                                               else
+                                                       LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
+                                                               fmtaddr(addr.sin_addr.s_addr, 0));
+                                       }
 
                                        n--;
                                        break;

diff --git a/l2tpns.spec b/l2tpns.spec
index eff1e7c..9ddfa9d 100644 (file)
--- a/l2tpns.spec
+++ b/l2tpns.spec
@@ -43,5 +43,5 @@ rm -rf %{buildroot}
 %attr(644,root,root) /usr/share/man/man[58]/*
 
 %changelog
-* Fri Jan 20 2006 Brendan O'Dea <bod@optus.net> 2.1.16-1
+* Sat Feb 18 2006 Brendan O'Dea <bod@optus.net> 2.1.16-1
 - 2.1.16 release, see /usr/share/doc/l2tpns-2.1.16/Changes