From d51aa2819005a03e4cfb6f62333be6ccadfb3c06 Mon Sep 17 00:00:00 2001
From: Ondrej Zajicek <santiago@crfreenet.org>
Date: Sun, 26 Oct 2008 22:42:39 +0100
Subject: Implementation of MD5 authentication of BGP sessions.

---
 proto/bgp/bgp.c    | 19 ++++++++++++++++++-
 proto/bgp/bgp.h    |  1 +
 proto/bgp/config.Y |  4 +++-
 3 files changed, 22 insertions(+), 2 deletions(-)

(limited to 'proto/bgp')

diff --git a/proto/bgp/bgp.c b/proto/bgp/bgp.c
index ed2524c..e1f5ec0 100644
--- a/proto/bgp/bgp.c
+++ b/proto/bgp/bgp.c
@@ -78,10 +78,14 @@ static void bgp_setup_listen_sk(void);
 
 
 static void
-bgp_close(struct bgp_proto *p UNUSED)
+bgp_close(struct bgp_proto *p)
 {
   ASSERT(bgp_counter);
   bgp_counter--;
+
+  if (p->cf->password)
+    sk_set_md5_auth(bgp_listen_sk, p->cf->remote_ip, NULL);
+
   if (!bgp_counter)
     {
       rfree(bgp_listen_sk);
@@ -330,6 +334,7 @@ bgp_connect(struct bgp_proto *p)	/* Enter Connect state and start establishing c
   bgp_setup_conn(p, conn);
   bgp_setup_sk(p, conn, s);
   s->tx_hook = bgp_connected;
+  s->password = p->cf->password;
   conn->state = BS_CONNECT;
   if (sk_open(s))
     {
@@ -506,6 +511,7 @@ bgp_start(struct proto *P)
 
   bgp_counter++;
   bgp_setup_listen_sk();
+
   if (!bgp_linpool)
     bgp_linpool = lp_new(&root_pool, 4080);
 
@@ -523,6 +529,17 @@ bgp_start(struct proto *P)
   lock->hook = bgp_start_locked;
   lock->data = p;
   olock_acquire(lock);
+
+  /* We should create security association after we get a lock not to 
+   * break existing connections.
+   */
+  if (p->cf->password)
+    {
+      int rv = sk_set_md5_auth(bgp_listen_sk, p->cf->remote_ip, p->cf->password);
+      if (rv < 0)
+	return PS_STOP;
+    }
+
   return PS_START;
 }
 
diff --git a/proto/bgp/bgp.h b/proto/bgp/bgp.h
index aa1bd10..9338324 100644
--- a/proto/bgp/bgp.h
+++ b/proto/bgp/bgp.h
@@ -33,6 +33,7 @@ struct bgp_config {
   unsigned error_delay_time_min;	/* Time to wait after an error is detected */
   unsigned error_delay_time_max;
   unsigned disable_after_error;		/* Disable the protocol when error is detected */
+  char *password;			/* Password used for MD5 authentication */
 };
 
 struct bgp_conn {
diff --git a/proto/bgp/config.Y b/proto/bgp/config.Y
index 63dfb61..580c008 100644
--- a/proto/bgp/config.Y
+++ b/proto/bgp/config.Y
@@ -20,7 +20,7 @@ CF_KEYWORDS(BGP, LOCAL, NEIGHBOR, AS, HOLD, TIME, CONNECT, RETRY, KEEPALIVE,
 	MULTIHOP, STARTUP, VIA, NEXT, HOP, SELF, DEFAULT, PATH, METRIC,
 	ERROR, START, DELAY, FORGET, WAIT, DISABLE, AFTER,
 	BGP_PATH, BGP_LOCAL_PREF, BGP_MED, BGP_ORIGIN, BGP_NEXT_HOP,
-	BGP_ATOMIC_AGGR, BGP_AGGREGATOR, BGP_COMMUNITY, SOURCE, ADDRESS)
+	BGP_ATOMIC_AGGR, BGP_AGGREGATOR, BGP_COMMUNITY, SOURCE, ADDRESS, PASSWORD)
 
 CF_GRAMMAR
 
@@ -38,6 +38,7 @@ bgp_proto_start: proto_start BGP {
      BGP_CFG->error_amnesia_time = 300;
      BGP_CFG->error_delay_time_min = 60;
      BGP_CFG->error_delay_time_max = 300;
+     BGP_CFG->password = NULL;
  }
  ;
 
@@ -65,6 +66,7 @@ bgp_proto:
  | bgp_proto ERROR FORGET TIME expr ';' { BGP_CFG->error_amnesia_time = $5; } 
  | bgp_proto ERROR WAIT TIME expr ',' expr ';' { BGP_CFG->error_delay_time_min = $5; BGP_CFG->error_delay_time_max = $7; }
  | bgp_proto DISABLE AFTER ERROR bool ';' { BGP_CFG->disable_after_error = $5; }
+ | bgp_proto PASSWORD TEXT ';' { BGP_CFG->password = $3; }
  ;
 
 CF_ADDTO(dynamic_attr, BGP_PATH
-- 
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