X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/983b38e12f2ba4afcb8046835f3e3c158b6435c3..895d679e8ea7f092d6710dfa16bea8aec211d881:/radius.c?ds=sidebyside

diff --git a/radius.c b/radius.c
index 6a206ea..6b2e955 100644
--- a/radius.c
+++ b/radius.c
@@ -1,6 +1,6 @@
 // L2TPNS Radius Stuff
 
-char const *cvs_id_radius = "$Id: radius.c,v 1.24 2005-02-14 06:58:39 bodea Exp $";
+char const *cvs_id_radius = "$Id: radius.c,v 1.38 2005-07-31 10:35:39 bodea Exp $";
 
 #include <time.h>
 #include <stdio.h>
@@ -12,11 +12,13 @@ char const *cvs_id_radius = "$Id: radius.c,v 1.24 2005-02-14 06:58:39 bodea Exp
 #include <arpa/inet.h>
 #include <ctype.h>
 #include <netinet/in.h>
-#include "md5.h"
+#include <errno.h>
+#include <openssl/md5.h>
 #include "constants.h"
 #include "l2tpns.h"
 #include "plugin.h"
 #include "util.h"
+#include "cluster.h"
 
 extern radiust *radius;
 extern sessiont *session;
@@ -29,9 +31,9 @@ extern ip_filtert *ip_filters;
 void initrad(void)
 {
 	int i;
-	LOG(3, 0, 0, "Creating %d sockets for RADIUS queries\n", config->num_radfds);
-	radfds = calloc(sizeof(int), config->num_radfds);
-	for (i = 0; i < config->num_radfds; i++)
+	LOG(3, 0, 0, "Creating %d sockets for RADIUS queries\n", RADIUS_FDS);
+	radfds = calloc(sizeof(int), RADIUS_FDS);
+	for (i = 0; i < RADIUS_FDS; i++)
 	{
 		int flags;
 		radfds[i] = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
@@ -42,7 +44,7 @@ void initrad(void)
 
 void radiusclear(uint16_t r, sessionidt s)
 {
-	if (s) session[s].radius = 0;
+	if (s) sess_local[s].radius = 0;
 	memset(&radius[r], 0, sizeof(radius[r])); // radius[r].state = RADIUSNULL;
 }
 
@@ -51,7 +53,7 @@ static uint16_t get_free_radius()
 	int count;
 	static uint32_t next_radius_id = 0;
 
-	for (count = MAXRADIUS; count > 0 ; --count)
+	for (count = MAXRADIUS; count > 0; --count)
 	{
 		++next_radius_id;		// Find the next ID to check.
 		if (next_radius_id >= MAXRADIUS)
@@ -69,7 +71,7 @@ static uint16_t get_free_radius()
 
 uint16_t radiusnew(sessionidt s)
 {
-	uint16_t r = session[s].radius;
+	uint16_t r = sess_local[s].radius;
 
 	/* re-use */
 	if (r)
@@ -86,11 +88,13 @@ uint16_t radiusnew(sessionidt s)
 	};
 
 	memset(&radius[r], 0, sizeof(radius[r]));
-	session[s].radius = r;
+	sess_local[s].radius = r;
 	radius[r].session = s;
 	radius[r].state = RADIUSWAIT;
 	radius[r].retry = TIME + 1200; // Wait at least 120 seconds to re-claim this.
 
+	random_data(radius[r].auth, sizeof(radius[r].auth));
+
 	LOG(3, s, session[s].tunnel, "Allocated radius %d\n", r);
 	return r;
 }
@@ -130,7 +134,7 @@ void radiussend(uint16_t r, uint8_t state)
 		radius[r].try = 0;
 
 	radius[r].state = state;
-	radius[r].retry = backoff(radius[r].try++);
+	radius[r].retry = backoff(radius[r].try++) + 20; // 3s, 4s, 6s, 10s...
 	LOG(4, s, session[s].tunnel, "Send RADIUS id %d sock %d state %s try %d\n",
 		r >> RADIUS_SHIFT, r & RADIUS_MASK,
 		radius_state(radius[r].state), radius[r].try);
@@ -140,7 +144,7 @@ void radiussend(uint16_t r, uint8_t state)
 		if (s)
 		{
 			if (state == RADIUSAUTH)
-				sessionshutdown(s, "RADIUS timeout");
+				sessionshutdown(s, "RADIUS timeout.", 3, 0);
 			else
 			{
 				LOG(1, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n",
@@ -161,11 +165,12 @@ void radiussend(uint16_t r, uint8_t state)
 	switch (state)
 	{
 		case RADIUSAUTH:
-			b[0] = 1;               // access request
+			b[0] = AccessRequest;               // access request
 			break;
 		case RADIUSSTART:
 		case RADIUSSTOP:
-			b[0] = 4;               // accounting request
+		case RADIUSINTERIM:
+			b[0] = AccountingRequest;               // accounting request
 			break;
 		default:
 			LOG(0, 0, 0, "Unknown radius state %d\n", state);
@@ -177,7 +182,7 @@ void radiussend(uint16_t r, uint8_t state)
 	{
 		*p = 1;                 // user name
 		p[1] = strlen(session[s].user) + 2;
-		strcpy(p + 2, session[s].user);
+		strcpy((char *) p + 2, session[s].user);
 		p += p[1];
 	}
 	if (state == RADIUSAUTH)
@@ -207,13 +212,13 @@ void radiussend(uint16_t r, uint8_t state)
 				while (p < pl)
 				{
 					MD5_CTX ctx;
-					MD5Init(&ctx);
-					MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret));
+					MD5_Init(&ctx);
+					MD5_Update(&ctx, config->radiussecret, strlen(config->radiussecret));
 					if (p)
-						MD5Update(&ctx, pass + p - 16, 16);
+						MD5_Update(&ctx, pass + p - 16, 16);
 					else
-						MD5Update(&ctx, radius[r].auth, 16);
-					MD5Final(hash, &ctx);
+						MD5_Update(&ctx, radius[r].auth, 16);
+					MD5_Final(hash, &ctx);
 					do
 					{
 						pass[p] ^= hash[p & 15];
@@ -229,46 +234,73 @@ void radiussend(uint16_t r, uint8_t state)
 			p += p[1];
 		}
 	}
-	else if (state == RADIUSSTART || state == RADIUSSTOP)
-	{                          // accounting
-		*p = 40;                // accounting type
+	else if (state == RADIUSSTART || state == RADIUSSTOP || state == RADIUSINTERIM)
+	{			// accounting
+		*p = 40;	// accounting type
 		p[1] = 6;
-		*(uint32_t *) (p + 2) = htonl((state == RADIUSSTART) ? 1 : 2);
+		*(uint32_t *) (p + 2) = htonl(state - RADIUSSTART + 1); // start=1, stop=2, interim=3
 		p += p[1];
 		if (s)
 		{
-			*p = 44;           // session ID
+			*p = 44;	// session ID
 			p[1] = 18;
-			sprintf(p + 2, "%08X%08X", session[s].id, session[s].opened);
+			sprintf((char *) p + 2, "%08X%08X", session[s].unique_id, session[s].opened);
 			p += p[1];
-			if (state == RADIUSSTOP)
-			{                // stop
-				*p = 42;      // input octets
+			if (state == RADIUSSTART)
+			{			// start
+				*p = 41;	// delay
+				p[1] = 6;
+				*(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
+				p += p[1];
+				sess_local[s].last_interim = time_now; // Setup "first" Interim
+			}
+			else
+			{			// stop, interim
+				*p = 42;	// input octets
 				p[1] = 6;
 				*(uint32_t *) (p + 2) = htonl(session[s].cin);
 				p += p[1];
-				*p = 43;      // output octets
+
+				*p = 43;	// output octets
 				p[1] = 6;
 				*(uint32_t *) (p + 2) = htonl(session[s].cout);
 				p += p[1];
-				*p = 46;      // session time
+
+				*p = 46;	// session time
 				p[1] = 6;
 				*(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
 				p += p[1];
-				*p = 47;      // input packets
+
+				*p = 47;	// input packets
 				p[1] = 6;
 				*(uint32_t *) (p + 2) = htonl(session[s].pin);
 				p += p[1];
-				*p = 48;      // output spackets
+
+				*p = 48;	// output packets
 				p[1] = 6;
 				*(uint32_t *) (p + 2) = htonl(session[s].pout);
 				p += p[1];
-			}
-			else
-			{                // start
-				*p = 41;      // delay
+
+				*p = 52;	// input gigawords
 				p[1] = 6;
-				*(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
+				*(uint32_t *) (p + 2) = htonl(session[s].cin_wrap);
+				p += p[1];
+
+				*p = 53;	// output gigawords
+				p[1] = 6;
+				*(uint32_t *) (p + 2) = htonl(session[s].cout_wrap);
+				p += p[1];
+			}
+
+			if (session[s].snoop_ip && session[s].snoop_port)
+			{
+				*p = 26;				// vendor-specific
+				*(uint32_t *) (p + 2) = htonl(9);	// Cisco
+				p[6] = 1;				// Cisco-AVPair
+				p[7] = 2 + sprintf((char *) p + 8, "intercept=%s:%d",
+					fmtaddr(session[s].snoop_ip, 0), session[s].snoop_port);
+
+				p[1] = p[7] + 6;
 				p += p[1];
 			}
 		}
@@ -291,21 +323,14 @@ void radiussend(uint16_t r, uint8_t state)
 	{
 		*p = 30;                // called
 		p[1] = strlen(session[s].called) + 2;
-		strcpy(p + 2, session[s].called);
-		p += p[1];
-	}
-	if (*radius[r].calling)
-	{
-		*p = 31;                // calling
-		p[1] = strlen(radius[r].calling) + 2;
-		strcpy(p + 2, radius[r].calling);
+		strcpy((char *) p + 2, session[s].called);
 		p += p[1];
 	}
 	else if (*session[s].calling)
 	{
 		*p = 31;                // calling
 		p[1] = strlen(session[s].calling) + 2;
-		strcpy(p + 2, session[s].calling);
+		strcpy((char *) p + 2, session[s].calling);
 		p += p[1];
 	}
 	// NAS-IP-Address
@@ -319,15 +344,15 @@ void radiussend(uint16_t r, uint8_t state)
 	if (state != RADIUSAUTH)
 	{
 	    // Build auth for accounting packet
-	    char z[16] = {0};
-	    char hash[16] = {0};
+	    uint8_t z[16] = {0};
+	    uint8_t hash[16] = {0};
 	    MD5_CTX ctx;
-	    MD5Init(&ctx);
-	    MD5Update(&ctx, b, 4);
-	    MD5Update(&ctx, z, 16);
-	    MD5Update(&ctx, b + 20, (p - b) - 20);
-	    MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret));
-	    MD5Final(hash, &ctx);
+	    MD5_Init(&ctx);
+	    MD5_Update(&ctx, b, 4);
+	    MD5_Update(&ctx, z, 16);
+	    MD5_Update(&ctx, b + 20, (p - b) - 20);
+	    MD5_Update(&ctx, config->radiussecret, strlen(config->radiussecret));
+	    MD5_Final(hash, &ctx);
 	    memcpy(b + 4, hash, 16);
 	    memcpy(radius[r].auth, hash, 16);
 	}
@@ -345,6 +370,47 @@ void radiussend(uint16_t r, uint8_t state)
 	sendto(radfds[r & RADIUS_MASK], b, p - b, 0, (void *) &addr, sizeof(addr));
 }
 
+static void handle_avpair(sessionidt s, uint8_t *avp, int len)
+{
+	uint8_t *key = avp;
+	uint8_t *value = memchr(avp, '=', len);
+	uint8_t tmp[2048] = "";
+
+	if (value)
+	{
+		*value++ = 0;
+		len -= value - key;
+	}
+	else
+	{
+	    	value = tmp;
+		len = 0;
+	}
+
+	// strip quotes
+	if (len > 2 && (*value == '"' || *value == '\'') && value[len - 1] == *value)
+	{
+		value++;
+		len--;
+		value[len - 1] = 0;
+	}
+	// copy and null terminate
+	else if (len < sizeof(tmp) - 1)
+	{
+		memcpy(tmp, value, len);
+		tmp[len] = 0;
+		value = tmp;
+	}
+	else
+		return;
+	
+	// Run hooks
+	{
+		struct param_radius_response p = { &tunnel[session[s].tunnel], &session[s], (char *) key, (char *) value };
+		run_plugins(PLUGIN_RADIUS_RESPONSE, &p);
+	}
+}
+
 // process RADIUS response
 void processrad(uint8_t *buf, int len, char socket_index)
 {
@@ -381,18 +447,19 @@ void processrad(uint8_t *buf, int len, char socket_index)
 		LOG(1, s, session[s].tunnel, "   Unexpected RADIUS response\n");
 		return;
 	}
-	if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSSTART && radius[r].state != RADIUSSTOP)
+	if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSSTART
+	    && radius[r].state != RADIUSSTOP && radius[r].state != RADIUSINTERIM)
 	{
 		LOG(1, s, session[s].tunnel, "   Unexpected RADIUS response\n");
 		return;
 	}
 	t = session[s].tunnel;
-	MD5Init(&ctx);
-	MD5Update(&ctx, buf, 4);
-	MD5Update(&ctx, radius[r].auth, 16);
-	MD5Update(&ctx, buf + 20, len - 20);
-	MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret));
-	MD5Final(hash, &ctx);
+	MD5_Init(&ctx);
+	MD5_Update(&ctx, buf, 4);
+	MD5_Update(&ctx, radius[r].auth, 16);
+	MD5_Update(&ctx, buf + 20, len - 20);
+	MD5_Update(&ctx, config->radiussecret, strlen(config->radiussecret));
+	MD5_Final(hash, &ctx);
 	do {
 		if (memcmp(hash, buf + 4, 16))
 		{
@@ -401,7 +468,7 @@ void processrad(uint8_t *buf, int len, char socket_index)
 		}
 
 		if ((radius[r].state == RADIUSAUTH && r_code != AccessAccept && r_code != AccessReject) ||
-			((radius[r].state == RADIUSSTART || radius[r].state == RADIUSSTOP) && r_code != AccountingResponse))
+			((radius[r].state == RADIUSSTART || radius[r].state == RADIUSSTOP || radius[r].state == RADIUSINTERIM) && r_code != AccountingResponse))
 		{
 			LOG(1, s, session[s].tunnel, "   Unexpected RADIUS response %s\n", radius_code(r_code));
 			return; // We got something we didn't expect. Let the timeouts take
@@ -541,48 +608,46 @@ void processrad(uint8_t *buf, int len, char socket_index)
 					else if (*p == 11)
 					{
 					    	// Filter-Id
-					    	char *filter = p + 2;
+					    	char *filter = (char *) p + 2;
 						int l = p[1] - 2;
 						char *suffix;
-						uint8_t *f = 0;
-						int i;
+						int f;
+						uint8_t *fp = 0;
 
 						LOG(3, s, session[s].tunnel, "   Radius reply contains Filter-Id \"%.*s\"\n", l, filter);
 						if ((suffix = memchr(filter, '.', l)))
 						{
 							int b = suffix - filter;
 							if (l - b == 3 && !memcmp("in", suffix+1, 2))
-								f = &session[s].filter_in;
+								fp = &session[s].filter_in;
 							else if (l - b == 4 && !memcmp("out", suffix+1, 3))
-								f = &session[s].filter_out;
+								fp = &session[s].filter_out;
 
 							l = b;
 						}
 
-						if (!f)
+						if (!fp)
 						{
 							LOG(3, s, session[s].tunnel, "    Invalid filter\n");
 							continue;
 						}
 
-						for (*f = 0, i = 0; !*f && i < MAXFILTER; i++)
-							if (strlen(ip_filters[i].name) == l &&
-							    !strncmp(ip_filters[i].name, filter, l))
-								*f = i + 1;
-
-						if (*f)
-							ip_filters[*f - 1].used++;
-						else
+						if ((f = find_filter(filter, l)) < 0 || !*ip_filters[f].name)
+						{
 							LOG(3, s, session[s].tunnel, "    Unknown filter\n");
-
+						}
+						else
+						{
+							*fp = f + 1;
+							ip_filters[f].used++;
+						}
 					}
 					else if (*p == 26 && p[1] >= 7)
 					{
 						// Vendor-Specific Attribute
 						int vendor = ntohl(*(int *)(p + 2));
 						char attrib = *(p + 6);
-						char attrib_length = *(p + 7) - 2;
-						char *avpair, *value, *key, *newp;
+						int attrib_length = *(p + 7) - 2;
 
 						LOG(3, s, session[s].tunnel, "   Radius reply contains Vendor-Specific.  Vendor=%d Attrib=%d Length=%d\n", vendor, attrib, attrib_length);
 						if (vendor != 9 || attrib != 1)
@@ -591,36 +656,13 @@ void processrad(uint8_t *buf, int len, char socket_index)
 							continue;
 						}
 
-						if (attrib_length < 0) continue;
-
-						avpair = key = calloc(attrib_length + 1, 1);
-						memcpy(avpair, p + 8, attrib_length);
-						LOG(3, s, session[s].tunnel, "      Cisco-Avpair value: %s\n", avpair);
-						do {
-							value = strchr(key, '=');
-							if (!value) break;
-							*value++ = 0;
-
-							// Trim quotes off reply string
-							if (*value == '\'' || *value == '\"')
-							{
-								char *x;
-								value++;
-								x = value + strlen(value) - 1;
-								if (*x == '\'' || *x == '\"')
-									*x = 0;
-							}
+						if (attrib_length > 0)
+						{
+							LOG(3, s, session[s].tunnel, "      Cisco-AVPair value: %.*s\n",
+								attrib_length, p + 8);
 
-							// Run hooks
-							newp = strchr(value, ',');
-							if (newp) *newp++ = 0;
-							{
-								struct param_radius_response p = { &tunnel[session[s].tunnel], &session[s], key, value };
-								run_plugins(PLUGIN_RADIUS_RESPONSE, &p);
-							}
-							key = newp;
-						} while (newp);
-						free(avpair);
+							handle_avpair(s, p + 8, attrib_length);
+						}
 					}
 					else if (*p == 99)
 					{
@@ -629,10 +671,10 @@ void processrad(uint8_t *buf, int len, char socket_index)
 						int prefixlen;
 						uint8_t *n = p + 2;
 						uint8_t *e = p + p[1];
-						uint8_t *m = strchr(n, '/');
+						uint8_t *m = memchr(n, '/', e - p);
 
 						*m++ = 0;
-						inet_pton(AF_INET6, n, &r6);
+						inet_pton(AF_INET6, (char *) n, &r6);
 
 						prefixlen = 0;
 						while (m < e && isdigit(*m)) {
@@ -659,12 +701,12 @@ void processrad(uint8_t *buf, int len, char socket_index)
 
 			if (!session[s].dns1 && config->default_dns1)
 			{
-				session[s].dns1 = htonl(config->default_dns1);
+				session[s].dns1 = ntohl(config->default_dns1);
 				LOG(3, s, t, "   Sending dns1 = %s\n", fmtaddr(config->default_dns1, 0));
 			}
 			if (!session[s].dns2 && config->default_dns2)
 			{
-				session[s].dns2 = htonl(config->default_dns2);
+				session[s].dns2 = ntohl(config->default_dns2);
 				LOG(3, s, t, "   Sending dns2 = %s\n", fmtaddr(config->default_dns2, 0));
 			}
 
@@ -694,30 +736,324 @@ void radiusretry(uint16_t r)
 
 	if (s) t = session[s].tunnel;
 
-	radius[r].retry = backoff(radius[r].try + 1);
 	switch (radius[r].state)
 	{
-		case RADIUSCHAP:           // sending CHAP down PPP
+		case RADIUSCHAP:	// sending CHAP down PPP
 			sendchap(t, s);
 			break;
-		case RADIUSIPCP:
-			sendipcp(t, s);         // send IPCP
-			break;
-		case RADIUSAUTH:           // sending auth to RADIUS server
-			radiussend(r, RADIUSAUTH);
-			break;
-		case RADIUSSTART:          // sending start accounting to RADIUS server
-			radiussend(r, RADIUSSTART);
-			break;
-		case RADIUSSTOP:           // sending stop accounting to RADIUS server
-			radiussend(r, RADIUSSTOP);
+		case RADIUSAUTH:	// sending auth to RADIUS server
+		case RADIUSSTART:	// sending start accounting to RADIUS server
+		case RADIUSSTOP:	// sending stop accounting to RADIUS server
+		case RADIUSINTERIM:	// sending interim accounting to RADIUS server
+			radiussend(r, radius[r].state);
 			break;
 		default:
-		case RADIUSNULL:           // Not in use
-		case RADIUSWAIT:           // waiting timeout before available, in case delayed reply from RADIUS server
+		case RADIUSNULL:	// Not in use
+		case RADIUSWAIT:	// waiting timeout before available, in case delayed reply from RADIUS server
 			// free up RADIUS task
 			radiusclear(r, s);
 			LOG(3, s, session[s].tunnel, "Freeing up radius session %d\n", r);
 			break;
 	}
 }
+
+extern int daefd;
+
+void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen)
+{
+	int i, r_code, r_id, length, attribute_length;
+	uint8_t vector[16], hash[16], *packet, attribute;
+	MD5_CTX ctx;
+	char username[MAXUSER] = "";
+	in_addr_t nas = 0;
+	in_addr_t ip = 0;
+	uint32_t port = 0;
+	uint32_t error = 0;
+	sessionidt s = 0;
+	tunnelidt t;
+	int fin = -1;
+	int fout = -1;
+	uint8_t *avpair[64];
+	int avpair_len[sizeof(avpair)/sizeof(*avpair)];
+	int avp = 0;
+	int auth_only = 0;
+	uint8_t *p;
+
+	LOG(3, 0, 0, "DAE request from %s\n", fmtaddr(addr->sin_addr.s_addr, 0));
+	LOG_HEX(5, "DAE Request", buf, len);
+
+	if (len < 20 || len < ntohs(*(uint16_t *) (buf + 2)))
+	{
+		LOG(1, 0, 0, "Duff DAE request length %d\n", len);
+		return;
+	}
+
+	r_code = buf[0]; // request type
+	r_id = buf[1]; // radius indentifier.
+
+	if (r_code != DisconnectRequest && r_code != CoARequest)
+	{
+		LOG(1, 0, 0, "Unrecognised DAE request %s\n", radius_code(r_code));
+		return;
+	}
+
+	if (!config->cluster_iam_master)
+	{
+		master_forward_dae_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
+		return;
+	}
+
+	len = ntohs(*(uint16_t *) (buf + 2));
+
+	LOG(3, 0, 0, "Received DAE %s, id %d\n", radius_code(r_code), r_id);
+
+	// check authenticator
+	memcpy(vector, buf + 4, 16);
+	memset(buf + 4, 0, 16);
+
+	i = strlen(config->radiussecret);
+	if (i > 16) i = 16;
+
+	MD5_Init(&ctx);
+	MD5_Update(&ctx, buf, len);
+	MD5_Update(&ctx, config->radiussecret, i);
+	MD5_Final(hash, &ctx);
+	if (memcmp(hash, vector, 16) != 0)
+	{
+		LOG(1, 0, 0, "Incorrect vector in DAE request (wrong secret in radius config?)\n");
+		return;
+	}
+
+	// unpack attributes
+	packet = buf + 20;
+	length = len - 20;
+
+	while (length > 0)
+	{
+		attribute = *packet++;
+		attribute_length = *packet++;
+		if (attribute_length < 2)
+			break;
+
+		length -= attribute_length;
+		attribute_length -= 2;
+		switch (attribute)
+		{
+		case 1: /* username */
+			len = attribute_length < MAXUSER ? attribute_length : MAXUSER - 1;
+			memcpy(username, packet, len);
+			username[len] = 0;
+			LOG(4, 0, 0, "    Received DAE User-Name: %s\n", username);
+			break;
+
+		case 4: /* nas ip address */
+			nas = *(uint32_t *) packet; // net order
+			if (nas != config->bind_address)
+				error = 403; // NAS identification mismatch
+
+			LOG(4, 0, 0, "    Received DAE NAS-IP-Address: %s\n", fmtaddr(nas, 0));
+			break;
+
+		case 5: /* nas port */
+			port = ntohl(*(uint32_t *) packet);
+			if (port < 1 || port > MAXSESSION)
+				error = 404;
+
+			LOG(4, 0, 0, "    Received DAE NAS-Port: %u\n", port);
+			break;
+
+		case 6: /* service type */
+			{
+				uint32_t service_type = ntohl(*(uint32_t *) packet);
+				auth_only = service_type == 8; // Authenticate only
+
+				LOG(4, 0, 0, "    Received DAE Service-Type: %u\n", service_type);
+			}
+			break;
+
+		case 8: /* ip address */
+			ip = *(uint32_t *) packet; // net order
+			LOG(4, 0, 0, "    Received DAE Framed-IP-Address: %s\n", fmtaddr(ip, 0));
+			break;
+
+		case 11: /* filter id */
+			LOG(4, 0, 0, "    Received DAE Filter-Id: %.*s\n", attribute_length, packet);
+			if (!(p = memchr(packet, '.', attribute_length)))
+			{
+				error = 404; // invalid request
+				break;
+			}
+
+			len = p - packet;
+			i = find_filter((char *) packet, len);
+			if (i < 0 || !*ip_filters[i].name)
+			{
+				error = 404;
+				break;
+			}
+
+			if (!memcmp(p, ".in", attribute_length - len))
+				fin = i + 1;
+			else if (!memcmp(p, ".out", attribute_length - len))
+				fout = i + 1;
+			else
+				error = 404;
+
+			break;
+
+		case 26: /* vendor specific */
+			if (attribute_length >= 6
+			    && ntohl(*(uint32_t *) packet) == 9	// Cisco
+			    && *(packet + 4) == 1		// Cisco-AVPair
+			    && *(packet + 5) >= 2)		// length
+			{
+				int len = *(packet + 5) - 2;
+				uint8_t *a = packet + 6;
+
+				LOG(4, 0, 0, "    Received DAE Cisco-AVPair: %.*s\n", len, a);
+				if (avp < sizeof(avpair)/sizeof(*avpair) - 1)
+				{
+					avpair[avp] = a;
+					avpair_len[avp++] = len;
+				}
+			}
+			break;
+		}
+
+		packet += attribute_length;
+	}
+
+	if (!error && auth_only)
+	{
+		if (fin != -1 || fout != -1 || avp)
+			error = 401; // unsupported attribute
+		else
+			error = 405; // unsupported service
+	}
+
+	if (!error && !(port || ip || *username))
+		error = 402; // missing attribute
+
+	// exact match for SID if given
+	if (!error && port)
+	{
+		s = port;
+		if (!session[s].opened)
+			error = 503; // not found
+	}
+
+	if (!error && ip)
+	{
+		// find/check session by IP
+		i = sessionbyip(ip);
+		if (!i || (s && s != i)) // not found or mismatching port
+			error = 503;
+		else
+			s = i;
+	}
+
+	if (!error && *username)
+	{
+		if (s)
+		{
+			if (strcmp(session[s].user, username))
+				error = 503;
+		}
+		else if (!(s = sessionbyuser(username)))
+			error = 503;
+	}
+
+	t = session[s].tunnel;
+
+	switch (r_code)
+	{
+	case DisconnectRequest: // Packet of Disconnect/Death
+		if (error)
+		{
+			r_code = DisconnectNAK;
+			break;
+		}
+
+		LOG(3, s, t, "    DAE Disconnect %d (%s)\n", s, session[s].user);
+		r_code = DisconnectACK;
+
+		sessionshutdown(s, "Requested by PoD", 3, 0); // disconnect session
+		break;
+
+	case CoARequest: // Change of Authorization
+		if (error)
+		{
+		    	r_code = CoANAK;
+			break;
+		}
+
+		LOG(3, s, t, "    DAE Change %d (%s)\n", s, session[s].user);
+		r_code = CoAACK;
+	
+		// reset
+		{
+			struct param_radius_reset p = { &tunnel[session[s].tunnel], &session[s] };
+			run_plugins(PLUGIN_RADIUS_RESET, &p);
+		}
+
+		// apply filters
+		if (fin == -1)
+			fin = 0;
+		else
+			LOG(3, s, t, "        Filter in %d (%s)\n", fin, ip_filters[fin - 1].name);
+
+		if (fout == -1)
+			fout = 0;
+		else
+			LOG(3, s, t, "        Filter out %d (%s)\n", fout, ip_filters[fout - 1].name);
+
+		filter_session(s, fin, fout);
+
+		// process cisco av-pair(s)
+		for (i = 0; i < avp; i++)
+		{
+			LOG(3, s, t, "        Cisco-AVPair: %.*s\n", avpair_len[i], avpair[i]);
+			handle_avpair(s, avpair[i], avpair_len[i]);
+		}
+
+		cluster_send_session(s);
+		break;
+	}
+
+	// send response
+	packet = buf;
+	*packet++ = r_code;
+	*packet++ = r_id;
+	packet += 2;
+	memset(packet, 0, 16);
+	packet += 16;
+	len = 20;
+
+	// add attributes
+	if (error)
+	{
+		// add error cause
+		*packet++ = 101;
+		*packet++ = 6;
+		*(uint32_t *) packet = htonl(error);
+		len += 6;
+	}
+
+	*((uint16_t *)(buf + 2)) = htons(len);
+
+	// make vector
+	i = strlen(config->radiussecret);
+	if (i > 16) i = 16;
+
+	MD5_Init(&ctx);
+	MD5_Update(&ctx, buf, len);
+	MD5_Update(&ctx, config->radiussecret, i);
+	MD5_Final(hash, &ctx);
+	memcpy(buf + 4, hash, 16);
+
+	LOG(3, 0, 0, "Sending DAE %s, id=%d\n", radius_code(r_code), r_id);
+
+	// send DAE response
+	if (sendto(daefd, buf, len, MSG_DONTWAIT | MSG_NOSIGNAL, (struct sockaddr *) addr, alen) < 0)
+		LOG(0, 0, 0, "Error sending DAE response packet: %s\n", strerror(errno));
+}