From 5d1a02eb41025020b8c25ab927baca978fb733a9 Mon Sep 17 00:00:00 2001
From: Linus Nordberg <linus@nordu.net>
Date: Sun, 10 Oct 2010 11:47:43 +0200
Subject: Rename rs_req_* --> rs_request_.

Contributed by Luke Howard.
---
 lib/examples/client-blocking.c | 4 ++--
 lib/include/radsec/request.h   | 6 +++---
 lib/request.c                  | 8 ++++++--
 3 files changed, 11 insertions(+), 7 deletions(-)

(limited to 'lib')

diff --git a/lib/examples/client-blocking.c b/lib/examples/client-blocking.c
index bb9e653..66f4859 100644
--- a/lib/examples/client-blocking.c
+++ b/lib/examples/client-blocking.c
@@ -63,9 +63,9 @@ blocking_client (const char *av1, const char *av2)
   {
     struct rs_request *request;
 
-    if (rs_request_new (conn, &request))
+    if (rs_request_create (conn, &request))
       return rs_err_conn_pop (conn);
-    if (rs_req_send (request, req, &resp))
+    if (rs_request_send (request, req, &resp))
       return rs_err_conn_pop (conn);
     rs_request_destroy (request);
   }
diff --git a/lib/include/radsec/request.h b/lib/include/radsec/request.h
index 3827da5..939345e 100644
--- a/lib/include/radsec/request.h
+++ b/lib/include/radsec/request.h
@@ -2,6 +2,6 @@
 
 struct rs_request;
 
-int rs_req_create(struct rs_connection *conn, struct rs_request **req_out);
-void rs_req_destroy(struct rs_request *request);
-int rs_req_send(struct rs_request *request, struct rs_packet *req, struct rs_packet **resp);
+int rs_request_create(struct rs_connection *conn, struct rs_request **req_out);
+void rs_request_destroy(struct rs_request *request);
+int rs_request_send(struct rs_request *request, struct rs_packet *req, struct rs_packet **resp);
diff --git a/lib/request.c b/lib/request.c
index 3d4b096..f0b15e0 100644
--- a/lib/request.c
+++ b/lib/request.c
@@ -1,14 +1,18 @@
 /* See the file COPYING for licensing information.  */
 
 #include <time.h>
+#include <assert.h>
 #include <event2/event.h>
 #include <radsec/radsec.h>
 #include <radsec/radsec-impl.h>
 #include <radsec/request.h>
 #include <radsec/request-impl.h>
 
+static int
+_rs_decrypt_mppe(struct rs_request *request, VALUE_PAIR *vp);
+
 int
-rs_req_create (struct rs_connection *conn, struct rs_request **req_out)
+rs_request_create (struct rs_connection *conn, struct rs_request **req_out)
 {
   struct rs_request *req = rs_malloc (conn->ctx, sizeof(*req));
   if (!req)
@@ -20,7 +24,7 @@ rs_req_create (struct rs_connection *conn, struct rs_request **req_out)
 }
 
 void
-rs_req_destroy(struct rs_request *request)
+rs_request_destroy (struct rs_request *request)
 {
   rs_packet_destroy (request->req);
   rs_packet_destroy (request->resp);
-- 
cgit v1.1


From 8a676ab2d88022aea68a2a31ac83dfe25d64e175 Mon Sep 17 00:00:00 2001
From: Linus Nordberg <linus@nordu.net>
Date: Sun, 10 Oct 2010 15:53:37 +0200
Subject: Robustness fixes (and some callback invocation) by Luke Howard.

* lib/packet.c (_packet_create): Set packet identity properly.
(_do_send): Return an int.
(_do_send): Don't ignore rad_encode() errors.
(_do_send): Do invoke rad_sign().
(_event_cb): Invoke callbacks.
(_event_cb): Honour _do_send() return code.
(_read_cb): Check packet (by invoking rad_packet_ok()).
(_read_cb): Don't ignore rad_decode() errors.
(_read_cb): Invoke callbacks.
---
 lib/include/radsec/radsec-impl.h |  2 ++
 lib/packet.c                     | 39 +++++++++++++++++++++++++++++++--------
 2 files changed, 33 insertions(+), 8 deletions(-)

(limited to 'lib')

diff --git a/lib/include/radsec/radsec-impl.h b/lib/include/radsec/radsec-impl.h
index b46bc47..d2ea095 100644
--- a/lib/include/radsec/radsec-impl.h
+++ b/lib/include/radsec/radsec-impl.h
@@ -63,9 +63,11 @@ struct rs_connection {
     enum rs_conn_type type;
     struct rs_credentials transport_credentials;
     struct rs_conn_callbacks callbacks;
+    void *user_data;
     struct rs_peer *peers;
     struct rs_peer *active_peer;
     struct rs_error *err;
+    int nextid;
 };
 
 struct rs_packet {
diff --git a/lib/packet.c b/lib/packet.c
index 54bfc01..6b95b73 100644
--- a/lib/packet.c
+++ b/lib/packet.c
@@ -24,7 +24,7 @@ _packet_create (struct rs_connection *conn, struct rs_packet **pkt_out)
   rpkt = rad_alloc (1);
   if (!rpkt)
     return rs_err_conn_push (conn, RSE_NOMEM, __func__);
-  rpkt->id = -1;
+  rpkt->id = conn->nextid++;
 
   p = (struct rs_packet *) malloc (sizeof (struct rs_packet));
   if (!p)
@@ -40,12 +40,17 @@ _packet_create (struct rs_connection *conn, struct rs_packet **pkt_out)
   return RSE_OK;
 }
 
-static void
+static int
 _do_send (struct rs_packet *pkt)
 {
   int err;
 
-  rad_encode (pkt->rpkt, NULL, pkt->conn->active_peer->secret);
+  if (rad_encode (pkt->rpkt, NULL, pkt->conn->active_peer->secret))
+    return rs_err_conn_push_fl (pkg->conn, RSE_FR, __FILE__, __LINE__,
+				"rad_encode: %s", fr_strerror ());
+  if (rad_sign (pkt->rpkt, NULL, pkt->conn->active_peer->secret))
+    return rs_err_conn_push_fl (pkg->conn, RSE_FR, __FILE__, __LINE__,
+				"rad_sign: %s", fr_strerror ());
   assert (pkt->rpkt);
 #if defined (DEBUG)
   {
@@ -63,16 +68,19 @@ _do_send (struct rs_packet *pkt)
   err = bufferevent_write (pkt->conn->bev, pkt->rpkt->data,
 			   pkt->rpkt->data_len);
   if (err < 0)
-    rs_err_conn_push_fl (pkt->conn, RSE_EVENT, __FILE__, __LINE__,
-			 "bufferevent_write: %s", evutil_gai_strerror(err));
+    return rs_err_conn_push_fl (pkt->conn, RSE_EVENT, __FILE__, __LINE__,
+				"bufferevent_write: %s",
+				evutil_gai_strerror(err));
+  return RSE_OK;
 }
 
 static void
 _event_cb (struct bufferevent *bev, short events, void *ctx)
 {
-  struct rs_packet *pkt = (struct rs_packet *) ctx;
+  struct rs_packet *pkt = (struct rs_packet *)ctx;
   struct rs_connection *conn;
   struct rs_peer *p;
+  int err;
 
   assert (pkt);
   assert (pkt->conn);
@@ -84,10 +92,17 @@ _event_cb (struct bufferevent *bev, short events, void *ctx)
   if (events & BEV_EVENT_CONNECTED)
     {
       p->is_connected = 1;
+      if (conn->callbacks.connected_cb)
+	conn->callbacks.connected_cb (conn->user_data);
+
 #if defined (DEBUG)
       fprintf (stderr, "%s: connected\n", __func__);
 #endif
-      _do_send (pkt);
+      err = _do_send (pkt);
+      if (err)
+	return err;
+      if (conn->callbacks.sent_cb)
+	conn->callbacks.sent_cb (conn->user_data);
       /* Packet will be freed in write callback.  */
     }
   else if (events & BEV_EVENT_ERROR)
@@ -162,7 +177,14 @@ _read_cb (struct bufferevent *bev, void *ctx)
 #if defined (DEBUG)
       fprintf (stderr, "%s: complete packet read\n", __func__);
 #endif
-      rad_decode (pkt->rpkt, NULL, pkt->conn->active_peer->secret);
+      if (!rad_packet_ok (pkt->rpkt, 0) != 0)
+	return;
+      if (rad_decode (pkt->rpkt, NULL, pkt->conn->active_peer->secret) != 0)
+        return;
+
+      if (pkt->conn->callbacks.received_cb)
+	pkt->conn->callbacks.received_cb(pkt, pkt->conn->user_data);
+
       if (event_base_loopbreak (pkt->conn->evb) < 0)
 	abort ();		/* FIXME */
     }
@@ -335,6 +357,7 @@ int
 rs_packet_send (struct rs_packet *pkt, void *user_data)
 {
   struct rs_connection *conn;
+
   assert (pkt);
   conn = pkt->conn;
 
-- 
cgit v1.1


From 735f0808c02e705e7649c58471d36ca367c50017 Mon Sep 17 00:00:00 2001
From: Linus Nordberg <linus@nordu.net>
Date: Sun, 10 Oct 2010 15:56:01 +0200
Subject: Cosmetics.

---
 lib/attr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lib')

diff --git a/lib/attr.c b/lib/attr.c
index 49735d9..4e66235 100644
--- a/lib/attr.c
+++ b/lib/attr.c
@@ -21,7 +21,7 @@ rs_attr_create(struct rs_connection *conn, struct rs_attr **attr, const char *ty
     {
       rs_attr_destroy (a);
       return rs_err_conn_push_fl (conn, RSE_FR, __FILE__, __LINE__,
-				  "pairmake: %s", fr_strerror());
+				  "pairmake: %s", fr_strerror ());
     }
 
   a->vp = vp;
-- 
cgit v1.1


From 391369cb26363980cbe37d30c41d48a03dd46ef5 Mon Sep 17 00:00:00 2001
From: Linus Nordberg <linus@nordu.net>
Date: Sun, 10 Oct 2010 16:00:11 +0200
Subject: Compile again after bad fixes.

---
 lib/packet.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

(limited to 'lib')

diff --git a/lib/packet.c b/lib/packet.c
index 6b95b73..6f2088d 100644
--- a/lib/packet.c
+++ b/lib/packet.c
@@ -46,10 +46,10 @@ _do_send (struct rs_packet *pkt)
   int err;
 
   if (rad_encode (pkt->rpkt, NULL, pkt->conn->active_peer->secret))
-    return rs_err_conn_push_fl (pkg->conn, RSE_FR, __FILE__, __LINE__,
+    return rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
 				"rad_encode: %s", fr_strerror ());
   if (rad_sign (pkt->rpkt, NULL, pkt->conn->active_peer->secret))
-    return rs_err_conn_push_fl (pkg->conn, RSE_FR, __FILE__, __LINE__,
+    return rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
 				"rad_sign: %s", fr_strerror ());
   assert (pkt->rpkt);
 #if defined (DEBUG)
@@ -98,9 +98,8 @@ _event_cb (struct bufferevent *bev, short events, void *ctx)
 #if defined (DEBUG)
       fprintf (stderr, "%s: connected\n", __func__);
 #endif
-      err = _do_send (pkt);
-      if (err)
-	return err;
+      if (_do_send (pkt))
+	return;
       if (conn->callbacks.sent_cb)
 	conn->callbacks.sent_cb (conn->user_data);
       /* Packet will be freed in write callback.  */
-- 
cgit v1.1


From ff55882798b6c482faec920d30a4ffdc10b306f7 Mon Sep 17 00:00:00 2001
From: Linus Nordberg <linus@nordu.net>
Date: Mon, 11 Oct 2010 10:41:58 +0200
Subject: Request object implementation and bug fixes by Luke Howard.

---
 lib/err.c                         |   2 +-
 lib/include/radsec/radsec-impl.h  |   1 +
 lib/include/radsec/radsec.h       |   2 +
 lib/include/radsec/request-impl.h |   6 ++
 lib/packet.c                      |  64 ++++++++------
 lib/request.c                     | 177 ++++++++++++++++++++++++++++++++++++--
 6 files changed, 220 insertions(+), 32 deletions(-)

(limited to 'lib')

diff --git a/lib/err.c b/lib/err.c
index 116c995..51e4421 100644
--- a/lib/err.c
+++ b/lib/err.c
@@ -19,7 +19,7 @@ const char *_errtxt[] = {
   "libevent error"		/* 9 RSE_EVENT */
   "connection error"		/* 10 RSE_CONNERR */
   "invalid configuration file"	/* 11 RSE_CONFIG */
-  "ERR 12"			/*  RSE_ */
+  "authentication failed"	/*  RSE_BADAUTH */
   "ERR 13"			/*  RSE_ */
   "ERR 14"			/*  RSE_ */
   "ERR 15"			/*  RSE_ */
diff --git a/lib/include/radsec/radsec-impl.h b/lib/include/radsec/radsec-impl.h
index d2ea095..3ce01d0 100644
--- a/lib/include/radsec/radsec-impl.h
+++ b/lib/include/radsec/radsec-impl.h
@@ -68,6 +68,7 @@ struct rs_connection {
     struct rs_peer *active_peer;
     struct rs_error *err;
     int nextid;
+    int user_dispatch_flag : 1;	/* User does the dispatching.  */
 };
 
 struct rs_packet {
diff --git a/lib/include/radsec/radsec.h b/lib/include/radsec/radsec.h
index c8b43bf..db1e1a7 100644
--- a/lib/include/radsec/radsec.h
+++ b/lib/include/radsec/radsec.h
@@ -17,6 +17,7 @@ enum rs_err_code {
     RSE_EVENT = 9,
     RSE_CONNERR = 10,
     RSE_CONFIG = 11,
+    RSE_BADAUTH = 12,
     RSE_SOME_ERROR = 21,
 };
 
@@ -118,6 +119,7 @@ int rs_packet_send(struct rs_packet *pkt, void *data);
 struct radius_packet *rs_packet_frpkt(struct rs_packet *pkt);
 
 /* Attribute.  */
+/* FIXME: Replace (or complement) with a wrapper for paircreate().  */
 int rs_attr_create(struct rs_connection *conn, struct rs_attr **attr,
 		   const char *type, const char *val);
 void rs_attr_destroy(struct rs_attr *attr);
diff --git a/lib/include/radsec/request-impl.h b/lib/include/radsec/request-impl.h
index 339dfea..4fa0ca9 100644
--- a/lib/include/radsec/request-impl.h
+++ b/lib/include/radsec/request-impl.h
@@ -7,4 +7,10 @@ struct rs_request
   struct rs_packet *req;
   struct rs_packet *resp;
   struct rs_conn_callbacks saved_cb;
+  int verified;
 };
+
+#define VENDORPEC_MS                        311 /* RFC 2548 */
+
+#define PW_MS_MPPE_SEND_KEY                 16
+#define PW_MS_MPPE_RECV_KEY                 17
diff --git a/lib/packet.c b/lib/packet.c
index 6f2088d..9abd698 100644
--- a/lib/packet.c
+++ b/lib/packet.c
@@ -120,17 +120,22 @@ _write_cb (struct bufferevent *bev, void *ctx)
 #endif
   if (event_base_loopbreak (pkt->conn->evb) < 0)
     abort ();			/* FIXME */
-  rs_packet_destroy (pkt);
+  if (!pkt->conn->callbacks.sent_cb) /* Callback owns the packet now.  */
+    rs_packet_destroy (pkt);
 }
 
 static void
 _read_cb (struct bufferevent *bev, void *ctx)
 {
-  struct rs_packet *pkt = (struct rs_packet *) ctx;
+  struct rs_packet *pkt = (struct rs_packet *)ctx;
   size_t n;
 
   assert (pkt);
   assert (pkt->conn);
+
+  pkt->rpkt->sockfd = pkt->conn->active_peer->fd; /* FIXME: Why?  */
+  pkt->rpkt->vps = NULL;			  /* FIXME: Why?  */
+
   if (!pkt->hdr_read_flag)
     {
       n = bufferevent_read (pkt->conn->bev, pkt->hdr, RS_HEADER_LEN);
@@ -340,14 +345,20 @@ rs_packet_create_acc_request (struct rs_connection *conn,
   pkt = *pkt_out;
   pkt->rpkt->code = PW_AUTHENTICATION_REQUEST;
 
-  if (rs_attr_create (conn, &attr, "User-Name", user_name))
-    return -1;
-  rs_packet_add_attr (pkt, attr);
+  if (user_name)
+    {
+      if (rs_attr_create (conn, &attr, "User-Name", user_name))
+	return -1;
+      rs_packet_add_attr (pkt, attr);
 
-  if (rs_attr_create (conn, &attr, "User-Password", user_pw))
-    return -1;
-  /* FIXME: need this too? rad_pwencode(user_pw, &pwlen, SECRET, reqauth) */
-  rs_packet_add_attr (pkt, attr);
+      if (user_pw)
+	{
+	  if (rs_attr_create (conn, &attr, "User-Password", user_pw))
+	    return -1;
+	  /* FIXME: need this too? rad_pwencode(user_pw, &pwlen, SECRET, reqauth) */
+	  rs_packet_add_attr (pkt, attr);
+	}
+    }
 
   return RSE_OK;
 }
@@ -371,14 +382,10 @@ rs_packet_send (struct rs_packet *pkt, void *user_data)
   assert (conn->active_peer);
   assert (conn->active_peer->fd >= 0);
 
-  if (conn->callbacks.connected_cb || conn->callbacks.disconnected_cb
-      || conn->callbacks.received_cb || conn->callbacks.sent_cb)
-    ;		/* FIXME: install event callbacks, other than below */
-  else
-    {
-      bufferevent_setcb (conn->bev, _read_cb, _write_cb, _event_cb, pkt);
-      event_base_dispatch (conn->evb);
-    }
+  conn->user_data = user_data;
+  bufferevent_setcb (conn->bev, _read_cb, _write_cb, _event_cb, pkt);
+  if (!conn->user_dispatch_flag)
+    event_base_dispatch (conn->evb);
 
 #if defined (DEBUG)
   fprintf (stderr, "%s: event loop done\n", __func__);
@@ -409,17 +416,22 @@ rs_conn_receive_packet (struct rs_connection *conn, struct rs_packet **pkt_out)
 
   bufferevent_setwatermark (conn->bev, EV_READ, RS_HEADER_LEN, 0);
   bufferevent_enable (conn->bev, EV_READ);
-  event_base_dispatch (conn->evb);
-#if defined (DEBUG)
-  fprintf (stderr, "%s: event loop done", __func__);
-  if (event_base_got_break(conn->evb))
+  bufferevent_setcb (conn->bev, _read_cb, _write_cb, _event_cb, pkt);
+
+  if (!conn->user_dispatch_flag)
     {
-      fprintf (stderr, ", got this:\n");
-      rs_dump_packet (pkt);
-    }
-  else
-    fprintf (stderr, ", no reply\n");
+      event_base_dispatch (conn->evb);
+#if defined (DEBUG)
+      fprintf (stderr, "%s: event loop done", __func__);
+      if (event_base_got_break(conn->evb))
+	{
+	  fprintf (stderr, ", got this:\n");
+	  rs_dump_packet (pkt);
+	}
+      else
+	fprintf (stderr, ", no reply\n");
 #endif
+    }
 
   return RSE_OK;
 }
diff --git a/lib/request.c b/lib/request.c
index f0b15e0..85278f3 100644
--- a/lib/request.c
+++ b/lib/request.c
@@ -39,12 +39,179 @@ _timer_cb(evutil_socket_t fd, short what, void *arg)
 }
 #endif
 
+static void
+_rs_req_connected(void *user_data)
+{
+  struct rs_request *request = (struct rs_request *)user_data;
+}
+
+static void
+_rs_req_disconnected(void *user_data)
+{
+  struct rs_request *request = (struct rs_request *)user_data;
+}
+
+static void
+_rs_req_packet_received(const struct rs_packet *pkt, void *user_data)
+{
+  struct rs_request *request = (struct rs_request *)user_data;
+  int err;
+  VALUE_PAIR *vp;
+
+  assert (request);
+  assert (request->conn);
+  assert (request->req);
+
+  err = rad_verify(pkt->rpkt, request->req->rpkt,
+		   pkt->conn->active_peer->secret);
+  if (err)
+    return;
+
+  for (vp = pkt->rpkt->vps; vp != NULL; vp = vp->next)
+    {
+      if (VENDOR(vp->attribute) != VENDORPEC_MS)
+	continue;
+
+      switch (vp->attribute & 0xffff)
+	{
+	  case PW_MS_MPPE_SEND_KEY:
+	  case PW_MS_MPPE_RECV_KEY:
+	    err = _rs_decrypt_mppe (request, vp);
+	    if (err)
+	      return;
+	    break;
+	  default:
+	    break;
+	}
+    }
+
+  request->verified = 1;
+}
+
+static void
+_rs_req_packet_sent(void *user_data)
+{
+  struct rs_request *request = (struct rs_request *)user_data;
+}
+
 int
-rs_req_send(struct rs_request *request, struct rs_packet *req,
-	    struct rs_packet **resp)
+rs_request_send(struct rs_request *request, struct rs_packet *req,
+	        struct rs_packet **resp)
 {
-  /* install our own callback, backing up any user provided one in
-     req->saved_cb*/
+  int err;
+  VALUE_PAIR *vp;
+  struct rs_connection *conn;
+
+  assert (request);
+  assert (request->conn);
+  conn = request->conn;
+
+  request->req = req;		/* take ownership */
+  request->saved_cb = conn->callbacks;
+
+  conn->callbacks.connected_cb = _rs_req_connected;
+  conn->callbacks.disconnected_cb = _rs_req_disconnected;
+  conn->callbacks.received_cb = _rs_req_packet_received;
+  conn->callbacks.sent_cb = _rs_req_packet_sent;
 
-  return -1;
+  assert(request->verified == 0);
+
+  vp = paircreate(PW_MESSAGE_AUTHENTICATOR, PW_TYPE_OCTETS);
+  pairadd(&request->req->rpkt->vps, vp);
+
+  err = rs_packet_send(request->req, request);
+  if (err)
+    goto cleanup;
+
+  err = rs_conn_receive_packet(request->conn, resp);
+  if (err)
+    goto cleanup;
+
+  if (!request->verified)
+    {
+      err = rs_err_conn_push_fl (conn, RSE_BADAUTH, __FILE__, __LINE__, NULL);
+      goto cleanup;
+    }
+
+cleanup:
+  conn->callbacks = request->saved_cb;
+  return err;
+}
+
+/*
+ * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+#include <openssl/md5.h>
+
+static int
+_rs_decrypt_mppe(struct rs_request *request, VALUE_PAIR *vp)
+{
+  unsigned char *key = vp->vp_octets;
+  size_t len = vp->length;
+  unsigned char plain[1 + MAX_STRING_LEN], *ppos = plain, *res;
+  const unsigned char *pos;
+  size_t left, plen;
+  unsigned char hash[MD5_DIGEST_LENGTH];
+  int i, first = 1;
+  const unsigned char *addr[3];
+  struct rs_connection *conn;
+
+  assert (request);
+  assert (request->conn);
+  conn = request->conn;
+
+  if (vp->type != PW_TYPE_OCTETS)
+    return rs_err_conn_push_fl (conn, RSE_BADAUTH, __FILE__, __LINE__, NULL);
+
+  pos = key + 2;
+  left = len - 2;
+  if (left % 16)
+    return rs_err_conn_push_fl (conn, RSE_BADAUTH, __FILE__, __LINE__, NULL);
+
+  plen = left;
+  if (plen > MAX_STRING_LEN)
+    return rs_err_conn_push_fl (conn, RSE_BADAUTH, __FILE__, __LINE__, NULL);
+
+  plain[0] = 0;
+
+  while (left)
+    {
+      MD5_CTX md5;
+
+      MD5_Init (&md5);
+      MD5_Update (&md5, conn->active_peer->secret,
+	          strlen (conn->active_peer->secret));
+      if (first)
+	{
+	  MD5_Update (&md5, request->req->rpkt->vector, MD5_DIGEST_LENGTH);
+	  MD5_Update (&md5, key, 2);
+	  first = 0;
+	}
+      else
+	{
+	  MD5_Update (&md5, pos - MD5_DIGEST_LENGTH, MD5_DIGEST_LENGTH);
+	}
+      MD5_Final (hash, &md5);
+
+      for (i = 0; i < MD5_DIGEST_LENGTH; i++)
+	*ppos++ = *pos++ ^ hash[i];
+      left -= MD5_DIGEST_LENGTH;
+    }
+
+  if (plain[0] == 0 || plain[0] > plen - 1)
+    return rs_err_conn_push_fl (conn, RSE_NOMEM, __FILE__, __LINE__, NULL);
+
+  memcpy (vp->vp_octets, plain + 1, plain[0]);
+  vp->length = plain[0];
+
+  return RSE_OK;
 }
-- 
cgit v1.1


From 06936d1f263c456017e20ea6c74d2756e1e30fcc Mon Sep 17 00:00:00 2001
From: Luke Howard <lukeh@padl.com>
Date: Sat, 9 Oct 2010 11:54:37 +0200
Subject: Have rad_decode() verify responses.

---
 lib/examples/client-blocking.c    |  14 +++--
 lib/include/radsec/radsec-impl.h  |   1 +
 lib/include/radsec/radsec.h       |   1 +
 lib/include/radsec/request-impl.h |   6 --
 lib/packet.c                      |  41 +++++++++++--
 lib/request.c                     | 126 +-------------------------------------
 6 files changed, 49 insertions(+), 140 deletions(-)

(limited to 'lib')

diff --git a/lib/examples/client-blocking.c b/lib/examples/client-blocking.c
index 66f4859..365b3b0 100644
--- a/lib/examples/client-blocking.c
+++ b/lib/examples/client-blocking.c
@@ -55,10 +55,16 @@ blocking_client (const char *av1, const char *av2)
 
 #if !defined(USE_REQUEST_OBJECT)
   if (rs_packet_send (req, NULL))
-    return rs_err_conn_pop (conn);
-  req = NULL;
-  if (rs_conn_receive_packet (conn, &resp))
-    return rs_err_conn_pop (conn);
+    {
+      rs_packet_destroy (req);
+      return rs_err_conn_pop (conn);
+    }
+  if (rs_conn_receive_packet (conn, req, &resp))
+    {
+      rs_packet_destroy (req);
+      return rs_err_conn_pop (conn);
+    }
+  rs_packet_destroy (req);
 #else
   {
     struct rs_request *request;
diff --git a/lib/include/radsec/radsec-impl.h b/lib/include/radsec/radsec-impl.h
index 3ce01d0..6e5ee83 100644
--- a/lib/include/radsec/radsec-impl.h
+++ b/lib/include/radsec/radsec-impl.h
@@ -76,6 +76,7 @@ struct rs_packet {
     char hdr_read_flag;
     uint8_t hdr[4];
     RADIUS_PACKET *rpkt;
+    struct rs_packet *original;
 };
 
 struct rs_attr {
diff --git a/lib/include/radsec/radsec.h b/lib/include/radsec/radsec.h
index db1e1a7..dd784cc 100644
--- a/lib/include/radsec/radsec.h
+++ b/lib/include/radsec/radsec.h
@@ -97,6 +97,7 @@ int rs_conn_select_server(struct rs_connection *conn, const char *name);
 int rs_conn_get_current_server(struct rs_connection *conn,
 			       const char *name, size_t buflen);
 int rs_conn_receive_packet(struct rs_connection *conn,
+			   struct rs_packet *request,
 			   struct rs_packet **pkt_out);
 int rs_conn_fd(struct rs_connection *conn);
 
diff --git a/lib/include/radsec/request-impl.h b/lib/include/radsec/request-impl.h
index 4fa0ca9..339dfea 100644
--- a/lib/include/radsec/request-impl.h
+++ b/lib/include/radsec/request-impl.h
@@ -7,10 +7,4 @@ struct rs_request
   struct rs_packet *req;
   struct rs_packet *resp;
   struct rs_conn_callbacks saved_cb;
-  int verified;
 };
-
-#define VENDORPEC_MS                        311 /* RFC 2548 */
-
-#define PW_MS_MPPE_SEND_KEY                 16
-#define PW_MS_MPPE_RECV_KEY                 17
diff --git a/lib/packet.c b/lib/packet.c
index 9abd698..7872a5a 100644
--- a/lib/packet.c
+++ b/lib/packet.c
@@ -44,6 +44,16 @@ static int
 _do_send (struct rs_packet *pkt)
 {
   int err;
+  VALUE_PAIR *vp;
+
+  assert (pkt->rpkt);
+  assert (!pkt->original);
+
+  vp = paircreate (PW_MESSAGE_AUTHENTICATOR, PW_TYPE_OCTETS);
+  if (!vp)
+    return rs_err_conn_push_fl (pkt->conn, RSE_NOMEM, __FILE__, __LINE__,
+				"rad_encode: %s", fr_strerror ());
+  pairadd (&pkt->rpkt->vps, vp);
 
   if (rad_encode (pkt->rpkt, NULL, pkt->conn->active_peer->secret))
     return rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
@@ -51,7 +61,6 @@ _do_send (struct rs_packet *pkt)
   if (rad_sign (pkt->rpkt, NULL, pkt->conn->active_peer->secret))
     return rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
 				"rad_sign: %s", fr_strerror ());
-  assert (pkt->rpkt);
 #if defined (DEBUG)
   {
     char host[80], serv[80];
@@ -183,11 +192,28 @@ _read_cb (struct bufferevent *bev, void *ctx)
 #endif
       if (!rad_packet_ok (pkt->rpkt, 0) != 0)
 	return;
-      if (rad_decode (pkt->rpkt, NULL, pkt->conn->active_peer->secret) != 0)
-        return;
+      assert (pkt->original);
+
+      /* Verify header and message authenticator.  */
+      if (rad_verify (pkt->rpkt, pkt->original->rpkt,
+		      pkt->conn->active_peer->secret))
+	{
+	  rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
+			       "rad_verify: %s", fr_strerror ());
+	  return;
+	}
+
+      /* decode and decrypt */
+      if (rad_decode (pkt->rpkt, pkt->original->rpkt,
+		      pkt->conn->active_peer->secret))
+	{
+	  rs_err_conn_push_fl (pkt->conn, RSE_FR, __FILE__, __LINE__,
+			       "rad_decode: %s", fr_strerror ());
+	  return;
+	}
 
       if (pkt->conn->callbacks.received_cb)
-	pkt->conn->callbacks.received_cb(pkt, pkt->conn->user_data);
+	pkt->conn->callbacks.received_cb (pkt, pkt->conn->user_data);
 
       if (event_base_loopbreak (pkt->conn->evb) < 0)
 	abort ();		/* FIXME */
@@ -396,7 +422,9 @@ rs_packet_send (struct rs_packet *pkt, void *user_data)
 }
 
 int
-rs_conn_receive_packet (struct rs_connection *conn, struct rs_packet **pkt_out)
+rs_conn_receive_packet (struct rs_connection *conn,
+		        struct rs_packet *request,
+		        struct rs_packet **pkt_out)
 {
   struct rs_packet *pkt;
 
@@ -406,6 +434,7 @@ rs_conn_receive_packet (struct rs_connection *conn, struct rs_packet **pkt_out)
     return -1;
   pkt = *pkt_out;
   pkt->conn = conn;
+  pkt->original = request;
 
   if (_conn_open (conn, pkt))
     return -1;
@@ -433,6 +462,8 @@ rs_conn_receive_packet (struct rs_connection *conn, struct rs_packet **pkt_out)
 #endif
     }
 
+  pkt->original = NULL;
+
   return RSE_OK;
 }
 
diff --git a/lib/request.c b/lib/request.c
index 85278f3..5cb87bb 100644
--- a/lib/request.c
+++ b/lib/request.c
@@ -8,9 +8,6 @@
 #include <radsec/request.h>
 #include <radsec/request-impl.h>
 
-static int
-_rs_decrypt_mppe(struct rs_request *request, VALUE_PAIR *vp);
-
 int
 rs_request_create (struct rs_connection *conn, struct rs_request **req_out)
 {
@@ -55,37 +52,6 @@ static void
 _rs_req_packet_received(const struct rs_packet *pkt, void *user_data)
 {
   struct rs_request *request = (struct rs_request *)user_data;
-  int err;
-  VALUE_PAIR *vp;
-
-  assert (request);
-  assert (request->conn);
-  assert (request->req);
-
-  err = rad_verify(pkt->rpkt, request->req->rpkt,
-		   pkt->conn->active_peer->secret);
-  if (err)
-    return;
-
-  for (vp = pkt->rpkt->vps; vp != NULL; vp = vp->next)
-    {
-      if (VENDOR(vp->attribute) != VENDORPEC_MS)
-	continue;
-
-      switch (vp->attribute & 0xffff)
-	{
-	  case PW_MS_MPPE_SEND_KEY:
-	  case PW_MS_MPPE_RECV_KEY:
-	    err = _rs_decrypt_mppe (request, vp);
-	    if (err)
-	      return;
-	    break;
-	  default:
-	    break;
-	}
-    }
-
-  request->verified = 1;
 }
 
 static void
@@ -99,7 +65,6 @@ rs_request_send(struct rs_request *request, struct rs_packet *req,
 	        struct rs_packet **resp)
 {
   int err;
-  VALUE_PAIR *vp;
   struct rs_connection *conn;
 
   assert (request);
@@ -114,104 +79,15 @@ rs_request_send(struct rs_request *request, struct rs_packet *req,
   conn->callbacks.received_cb = _rs_req_packet_received;
   conn->callbacks.sent_cb = _rs_req_packet_sent;
 
-  assert(request->verified == 0);
-
-  vp = paircreate(PW_MESSAGE_AUTHENTICATOR, PW_TYPE_OCTETS);
-  pairadd(&request->req->rpkt->vps, vp);
-
   err = rs_packet_send(request->req, request);
   if (err)
     goto cleanup;
 
-  err = rs_conn_receive_packet(request->conn, resp);
+  err = rs_conn_receive_packet(request->conn, request->req, resp);
   if (err)
     goto cleanup;
 
-  if (!request->verified)
-    {
-      err = rs_err_conn_push_fl (conn, RSE_BADAUTH, __FILE__, __LINE__, NULL);
-      goto cleanup;
-    }
-
 cleanup:
   conn->callbacks = request->saved_cb;
   return err;
 }
-
-/*
- * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
- */
-#include <openssl/md5.h>
-
-static int
-_rs_decrypt_mppe(struct rs_request *request, VALUE_PAIR *vp)
-{
-  unsigned char *key = vp->vp_octets;
-  size_t len = vp->length;
-  unsigned char plain[1 + MAX_STRING_LEN], *ppos = plain, *res;
-  const unsigned char *pos;
-  size_t left, plen;
-  unsigned char hash[MD5_DIGEST_LENGTH];
-  int i, first = 1;
-  const unsigned char *addr[3];
-  struct rs_connection *conn;
-
-  assert (request);
-  assert (request->conn);
-  conn = request->conn;
-
-  if (vp->type != PW_TYPE_OCTETS)
-    return rs_err_conn_push_fl (conn, RSE_BADAUTH, __FILE__, __LINE__, NULL);
-
-  pos = key + 2;
-  left = len - 2;
-  if (left % 16)
-    return rs_err_conn_push_fl (conn, RSE_BADAUTH, __FILE__, __LINE__, NULL);
-
-  plen = left;
-  if (plen > MAX_STRING_LEN)
-    return rs_err_conn_push_fl (conn, RSE_BADAUTH, __FILE__, __LINE__, NULL);
-
-  plain[0] = 0;
-
-  while (left)
-    {
-      MD5_CTX md5;
-
-      MD5_Init (&md5);
-      MD5_Update (&md5, conn->active_peer->secret,
-	          strlen (conn->active_peer->secret));
-      if (first)
-	{
-	  MD5_Update (&md5, request->req->rpkt->vector, MD5_DIGEST_LENGTH);
-	  MD5_Update (&md5, key, 2);
-	  first = 0;
-	}
-      else
-	{
-	  MD5_Update (&md5, pos - MD5_DIGEST_LENGTH, MD5_DIGEST_LENGTH);
-	}
-      MD5_Final (hash, &md5);
-
-      for (i = 0; i < MD5_DIGEST_LENGTH; i++)
-	*ppos++ = *pos++ ^ hash[i];
-      left -= MD5_DIGEST_LENGTH;
-    }
-
-  if (plain[0] == 0 || plain[0] > plen - 1)
-    return rs_err_conn_push_fl (conn, RSE_NOMEM, __FILE__, __LINE__, NULL);
-
-  memcpy (vp->vp_octets, plain + 1, plain[0]);
-  vp->length = plain[0];
-
-  return RSE_OK;
-}
-- 
cgit v1.1