// L2TPNS Radius Stuff
-char const *cvs_id_radius = "$Id: radius.c,v 1.33 2005/06/04 15:42:36 bodea Exp $";
-
#include <time.h>
#include <stdio.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <netinet/in.h>
+#include <errno.h>
+
#include "md5.h"
#include "constants.h"
+#include "dhcp6.h"
#include "l2tpns.h"
#include "plugin.h"
#include "util.h"
+#include "cluster.h"
+
+#include "l2tplac.h"
+#include "pppoe.h"
extern radiust *radius;
extern sessiont *session;
extern int *radfds;
extern ip_filtert *ip_filters;
+static const hasht zero;
+
+static void calc_auth(const void *buf, size_t len, const uint8_t *in, uint8_t *out)
+{
+ MD5_CTX ctx;
+
+ MD5_Init(&ctx);
+ MD5_Update(&ctx, (void *)buf, 4); // code, id, length
+ MD5_Update(&ctx, (void *)in, 16); // auth
+ MD5_Update(&ctx, (void *)(buf + 20), len - 20);
+ MD5_Update(&ctx, config->radiussecret, strlen(config->radiussecret));
+ MD5_Final(out, &ctx);
+}
+
// Set up socket for radius requests
void initrad(void)
{
int i;
+ uint16_t port = 0;
+ uint16_t min = config->radius_bind_min;
+ uint16_t max = config->radius_bind_max;
+ int inc = 1;
+ struct sockaddr_in addr;
+
+ if (min)
+ {
+ port = min;
+ if (!max)
+ max = ~0 - 1;
+ }
+ else if (max) /* no minimum specified, bind from max down */
+ {
+ port = max;
+ min = 1;
+ inc = -1;
+ }
+
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++)
radfds[i] = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
flags = fcntl(radfds[i], F_GETFL, 0);
fcntl(radfds[i], F_SETFL, flags | O_NONBLOCK);
+
+ if (port)
+ {
+ int b;
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_addr.s_addr = INADDR_ANY;
+
+ do {
+ addr.sin_port = htons(port);
+ if ((b = bind(radfds[i], (struct sockaddr *) &addr, sizeof(addr))) < 0)
+ {
+ if ((port += inc) < min || port > max)
+ {
+ LOG(0, 0, 0, "Can't bind RADIUS socket in range %u-%u\n", min, max);
+ exit(1);
+ }
+ }
+ } while (b < 0);
+ }
}
}
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)
return;
}
- if (state != RADIUSAUTH && !config->radius_accounting)
+ if (state != RADIUSAUTH && state != RADIUSJUSTAUTH && !config->radius_accounting)
{
// Radius accounting is turned off
radiusclear(r, s);
{
if (s)
{
- if (state == RADIUSAUTH)
- sessionshutdown(s, "RADIUS timeout.", 3, 0);
+ if (state == RADIUSAUTH || state == RADIUSJUSTAUTH)
+ sessionshutdown(s, "RADIUS timeout.", CDN_ADMIN_DISC, TERM_REAUTHENTICATION_FAILURE);
else
{
LOG(1, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n",
switch (state)
{
case RADIUSAUTH:
+ case RADIUSJUSTAUTH:
b[0] = AccessRequest; // access request
break;
case RADIUSSTART:
}
b[1] = r >> RADIUS_SHIFT; // identifier
memcpy(b + 4, radius[r].auth, 16);
+
p = b + 20;
if (s)
{
*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)
+ if (state == RADIUSAUTH || state == RADIUSJUSTAUTH)
{
if (radius[r].chap)
{
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];
p += p[1];
}
}
- else if (state == RADIUSSTART || state == RADIUSSTOP || state == RADIUSINTERIM)
- { // accounting
+ else // accounting
+ {
*p = 40; // accounting type
p[1] = 6;
*(uint32_t *) (p + 2) = htonl(state - RADIUSSTART + 1); // start=1, stop=2, interim=3
{
*p = 44; // session ID
p[1] = 18;
- sprintf(p + 2, "%08X%08X", session[s].unique_id, session[s].opened);
+ sprintf((char *) p + 2, "%08X%08X", session[s].unique_id, session[s].opened);
p += p[1];
if (state == RADIUSSTART)
{ // start
p[1] = 6;
*(uint32_t *) (p + 2) = htonl(session[s].cout);
p += p[1];
- if (state == RADIUSSTOP)
- {
- *p = 46; // session time
- p[1] = 6;
- *(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
- p += p[1];
- }
+
+ *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[1] = 6;
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(p + 8, "intercept=%s:%d",
- fmtaddr(session[s].snoop_ip, 0), session[s].snoop_port);
+ if (state == RADIUSSTOP && radius[r].term_cause)
+ {
+ *p = 49; // acct-terminate-cause
+ p[1] = 6;
+ *(uint32_t *) (p + 2) = htonl(radius[r].term_cause);
+ p += p[1];
- p[1] = p[7] + 6;
+ if (radius[r].term_msg)
+ {
+ *p = 26; // vendor-specific
+ *(uint32_t *) (p + 2) = htonl(9); // Cisco
+ p[6] = 1; // Cisco-AVPair
+ p[7] = 2 + sprintf((char *) p + 8, "disc-cause-ext=%s", radius[r].term_msg);
+ p[1] = p[7] + 6;
+ p += p[1];
+ }
+ }
+ }
+
+ if (session[s].classlen) {
+ *p = 25; // class
+ p[1] = session[s].classlen + 2;
+ memcpy(p + 2, session[s].class, session[s].classlen);
p += p[1];
}
+
+ {
+ struct param_radius_account acct = { &tunnel[session[s].tunnel], &session[s], &p };
+ run_plugins(PLUGIN_RADIUS_ACCOUNT, &acct);
+ }
}
}
+
if (s)
{
- *p = 5; // NAS-Port
+ *p = 5; // NAS-Port
p[1] = 6;
*(uint32_t *) (p + 2) = htonl(s);
p += p[1];
- }
- if (s && session[s].ip)
- {
- *p = 8; // Framed-IP-Address
+
+ *p = 6; // Service-Type
p[1] = 6;
- *(uint32_t *) (p + 2) = htonl(session[s].ip);
- p += p[1];
- }
- if (*session[s].called)
- {
- *p = 30; // called
- p[1] = strlen(session[s].called) + 2;
- strcpy(p + 2, session[s].called);
+ *(uint32_t *) (p + 2) = htonl((state == RADIUSJUSTAUTH ? 8 : 2)); // Authenticate only or Framed-User respectevily
p += p[1];
- }
- if (*radius[r].calling)
- {
- *p = 31; // calling
- p[1] = strlen(radius[r].calling) + 2;
- strcpy(p + 2, radius[r].calling);
- p += p[1];
- }
- else if (*session[s].calling)
- {
- *p = 31; // calling
- p[1] = strlen(session[s].calling) + 2;
- strcpy(p + 2, session[s].calling);
+
+ *p = 7; // Framed-Protocol
+ p[1] = htonl((state == RADIUSJUSTAUTH ? 0 : 6));
+ *(uint32_t *) (p + 2) = htonl((state == RADIUSJUSTAUTH ? 0 : 1)); // PPP
p += p[1];
+
+ if (session[s].ip)
+ {
+ *p = 8; // Framed-IP-Address
+ p[1] = 6;
+ *(uint32_t *) (p + 2) = htonl(session[s].ip);
+ p += p[1];
+ }
+
+ if (session[s].route[0].ip)
+ {
+ int r;
+ for (r = 0; s && r < MAXROUTE && session[s].route[r].ip; r++)
+ {
+ *p = 22; // Framed-Route
+ p[1] = sprintf((char *) p + 2, "%s/%d %s 1",
+ fmtaddr(htonl(session[s].route[r].ip), 0),
+ session[s].route[r].prefixlen,
+ fmtaddr(htonl(session[s].ip), 1)) + 2;
+
+ p += p[1];
+ }
+ }
+
+ if (session[s].session_timeout)
+ {
+ *p = 27; // Session-Timeout
+ p[1] = 6;
+ *(uint32_t *) (p + 2) = htonl(session[s].session_timeout);
+ p += p[1];
+ }
+
+ if (session[s].idle_timeout)
+ {
+ *p = 28; // Idle-Timeout
+ p[1] = 6;
+ *(uint32_t *) (p + 2) = htonl(session[s].idle_timeout);
+ p += p[1];
+ }
+
+ if (*session[s].called)
+ {
+ *p = 30; // called
+ p[1] = strlen(session[s].called) + 2;
+ strcpy((char *) p + 2, session[s].called);
+ p += p[1];
+ }
+
+ if (*session[s].calling)
+ {
+ *p = 31; // calling
+ p[1] = strlen(session[s].calling) + 2;
+ strcpy((char *) p + 2, session[s].calling);
+ p += p[1];
+ }
}
+
// NAS-IP-Address
*p = 4;
p[1] = 6;
// All AVpairs added
*(uint16_t *) (b + 2) = htons(p - b);
- if (state != RADIUSAUTH)
- {
- // Build auth for accounting packet
- char z[16] = {0};
- char 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);
- memcpy(b + 4, hash, 16);
- memcpy(radius[r].auth, hash, 16);
+ if (state != RADIUSAUTH && state != RADIUSJUSTAUTH)
+ {
+ // Build auth for accounting packet
+ calc_auth(b, p - b, zero, b + 4);
+ memcpy(radius[r].auth, b + 4, 16);
}
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
// get radius port
uint16_t port = config->radiusport[(radius[r].try - 1) % config->numradiusservers];
// assume RADIUS accounting port is the authentication port +1
- addr.sin_port = htons((state == RADIUSAUTH) ? port : port+1);
+ addr.sin_port = htons((state == RADIUSAUTH || state == RADIUSJUSTAUTH) ? port : port+1);
}
LOG_HEX(5, "RADIUS Send", b, (p - b));
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)
{
- uint8_t b[MAXCONTROL];
- MD5_CTX ctx;
+ uint8_t b[MAXETHER];
uint16_t r;
sessionidt s;
tunnelidt t = 0;
hasht hash;
- uint8_t routes = 0;
+ int routes = 0;
+ int routes6 = 0;
int r_code;
int r_id;
+ int OpentunnelReq = 0;
CSTAT(processrad);
LOG(1, s, session[s].tunnel, " Unexpected RADIUS response\n");
return;
}
- if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSSTART
+ if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSJUSTAUTH && 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);
+ calc_auth(buf, len, radius[r].auth, hash);
do {
if (memcmp(hash, buf + 4, 16))
{
return; // Do nothing. On timeout, it will try the next radius server.
}
- if ((radius[r].state == RADIUSAUTH && r_code != AccessAccept && r_code != AccessReject) ||
+ if (((radius[r].state == RADIUSAUTH ||radius[r].state == RADIUSJUSTAUTH) && r_code != AccessAccept && r_code != AccessReject) ||
((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));
// care off finishing the radius session if that's really correct.
}
- if (radius[r].state == RADIUSAUTH)
+ if (radius[r].state == RADIUSAUTH || radius[r].state == RADIUSJUSTAUTH)
{
// run post-auth plugin
struct param_post_auth packet = {
run_plugins(PLUGIN_POST_AUTH, &packet);
r_code = packet.auth_allowed ? AccessAccept : AccessReject;
- // process auth response
- if (radius[r].chap)
- {
- // CHAP
- uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPCHAP);
- if (!p) return; // Abort!
-
- *p = (r_code == AccessAccept) ? 3 : 4; // ack/nak
- p[1] = radius[r].id;
- *(uint16_t *) (p + 2) = ntohs(4); // no message
- tunnelsend(b, (p - b) + 4, t); // send it
-
- LOG(3, s, session[s].tunnel, " CHAP User %s authentication %s.\n", session[s].user,
- (r_code == AccessAccept) ? "allowed" : "denied");
- }
- else
- {
- // PAP
- uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP);
- if (!p) return; // Abort!
-
- // ack/nak
- *p = r_code;
- p[1] = radius[r].id;
- *(uint16_t *) (p + 2) = ntohs(5);
- p[4] = 0; // no message
- tunnelsend(b, (p - b) + 5, t); // send it
-
- LOG(3, s, session[s].tunnel, " PAP User %s authentication %s.\n", session[s].user,
- (r_code == AccessAccept) ? "allowed" : "denied");
- }
-
if (r_code == AccessAccept)
{
// Login successful
// Extract IP, routes, etc
uint8_t *p = buf + 20;
uint8_t *e = buf + len;
+ uint8_t tag;
+ uint8_t strtemp[256];
+ lac_reset_rad_tag_tunnel_ctxt();
+
for (; p + 2 <= e && p[1] && p + p[1] <= e; p += p[1])
{
+ if (*p == 26 && p[1] >= 7)
+ {
+ // Vendor-Specific Attribute
+ uint32_t vendor = ntohl(*(int *)(p + 2));
+ uint8_t attrib = *(p + 6);
+ int attrib_length = *(p + 7) - 2;
+
+ LOG(4, s, session[s].tunnel, " Radius reply contains Vendor-Specific. Vendor=%u Attrib=%u Length=%d\n", vendor, attrib, attrib_length);
+ if (vendor == 9 && attrib == 1) // Cisco-AVPair
+ {
+ if (attrib_length < 0) continue;
+ LOG(3, s, session[s].tunnel, " Cisco-AVPair value: %.*s\n",
+ attrib_length, p + 8);
+
+ handle_avpair(s, p + 8, attrib_length);
+ continue;
+ }
+ else if (vendor == 529 && attrib >= 135 && attrib <= 136) // Ascend
+ {
+ // handle old-format ascend DNS attributes below
+ p += 6;
+ }
+ else
+ {
+ LOG(3, s, session[s].tunnel, " Unknown vendor-specific\n");
+ continue;
+ }
+ }
+
if (*p == 8)
{
// Framed-IP-Address
else if (*p == 22)
{
// Framed-Route
- in_addr_t ip = 0, mask = 0;
+ in_addr_t ip = 0;
uint8_t u = 0;
uint8_t bits = 0;
uint8_t *n = p + 2;
n++;
while (n < e && isdigit(*n))
bits = bits * 10 + *n++ - '0';
- mask = (( -1) << (32 - bits));
}
else if ((ip >> 24) < 128)
- mask = 0xFF0000;
+ bits = 8;
else if ((ip >> 24) < 192)
- mask = 0xFFFF0000;
+ bits = 16;
else
- mask = 0xFFFFFF00;
+ bits = 24;
if (routes == MAXROUTE)
{
}
else if (ip)
{
- LOG(3, s, session[s].tunnel, " Radius reply contains route for %s/%s\n",
- fmtaddr(htonl(ip), 0), fmtaddr(htonl(mask), 1));
+ LOG(3, s, session[s].tunnel, " Radius reply contains route for %s/%d\n",
+ fmtaddr(htonl(ip), 0), bits);
session[s].route[routes].ip = ip;
- session[s].route[routes].mask = mask;
+ session[s].route[routes].prefixlen = bits;
routes++;
}
}
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 if (*p == 26 && p[1] >= 7)
- {
- // Vendor-Specific Attribute
- int vendor = ntohl(*(int *)(p + 2));
- char attrib = *(p + 6);
- int attrib_length = *(p + 7) - 2;
- char *avpair, *value, *key, *newp;
-
- 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)
+ }
+ else
{
- LOG(3, s, session[s].tunnel, " Unknown vendor-specific\n");
- continue;
+ *fp = f + 1;
+ ip_filters[f].used++;
}
-
- 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;
- }
-
- // 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);
+ }
+ else if (*p == 27)
+ {
+ // Session-Timeout
+ if (p[1] < 6) continue;
+ session[s].session_timeout = ntohl(*(uint32_t *)(p + 2));
+ LOG(3, s, session[s].tunnel, " Radius reply contains Session-Timeout = %u\n", session[s].session_timeout);
+ if(!session[s].session_timeout && config->kill_timedout_sessions)
+ sessionshutdown(s, "Session timeout is zero", CDN_ADMIN_DISC, 0);
+ }
+ else if (*p == 28)
+ {
+ // Idle-Timeout
+ if (p[1] < 6) continue;
+ session[s].idle_timeout = ntohl(*(uint32_t *)(p + 2));
+ LOG(3, s, session[s].tunnel, " Radius reply contains Idle-Timeout = %u\n", session[s].idle_timeout);
}
else if (*p == 99)
{
int prefixlen;
uint8_t *n = p + 2;
uint8_t *e = p + p[1];
- uint8_t *m = strchr(n, '/');
+ uint8_t *m = memchr(n, '/', e - n);
*m++ = 0;
- inet_pton(AF_INET6, n, &r6);
+ inet_pton(AF_INET6, (char *) n, &r6);
prefixlen = 0;
while (m < e && isdigit(*m)) {
if (prefixlen)
{
- LOG(3, s, session[s].tunnel,
- " Radius reply contains route for %s/%d\n",
- n, prefixlen);
- session[s].ipv6route = r6;
- session[s].ipv6prefixlen = prefixlen;
+ if (routes6 == MAXROUTE6)
+ {
+ LOG(1, s, session[s].tunnel, " Too many IPv6 routes\n");
+ }
+ else
+ {
+ LOG(3, s, session[s].tunnel, " Radius reply contains route for %s/%d\n", n, prefixlen);
+ session[s].route6[routes6].ipv6route = r6;
+ session[s].route6[routes6].ipv6prefixlen = prefixlen;
+ routes6++;
+ }
+ }
+ }
+ else if (*p == 123)
+ {
+ // Delegated-IPv6-Prefix
+ if ((p[1] > 4) && (p[3] > 0) && (p[3] <= 128))
+ {
+ char ipv6addr[INET6_ADDRSTRLEN];
+
+ if (routes6 == MAXROUTE6)
+ {
+ LOG(1, s, session[s].tunnel, " Too many IPv6 routes\n");
+ }
+ else
+ {
+ memcpy(&session[s].route6[routes6].ipv6route, &p[4], p[1] - 4);
+ session[s].route6[routes6].ipv6prefixlen = p[3];
+ LOG(3, s, session[s].tunnel, " Radius reply contains Delegated IPv6 Prefix %s/%d\n",
+ inet_ntop(AF_INET6, &session[s].route6[routes6].ipv6route, ipv6addr, INET6_ADDRSTRLEN), session[s].route6[routes6].ipv6prefixlen);
+ routes6++;
+ }
+ }
+ }
+ else if (*p == 168)
+ {
+ // Framed-IPv6-Address
+ if (p[1] == 18)
+ {
+ char ipv6addr[INET6_ADDRSTRLEN];
+ memcpy(&session[s].ipv6address, &p[2], 16);
+ LOG(3, s, session[s].tunnel, " Radius reply contains Framed-IPv6-Address %s\n", inet_ntop(AF_INET6, &session[s].ipv6address, ipv6addr, INET6_ADDRSTRLEN));
}
}
+ else if (*p == 25)
+ {
+ // Class
+ if (p[1] < 3) continue;
+ session[s].classlen = p[1] - 2;
+ if (session[s].classlen > MAXCLASS)
+ session[s].classlen = MAXCLASS;
+ memcpy(session[s].class, p + 2, session[s].classlen);
+ }
+ else if (*p == 64)
+ {
+ // Tunnel-Type
+ if (p[1] != 6) continue;
+ tag = p[2];
+ LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Type:%d %d\n",
+ tag, ntohl(*(uint32_t *)(p + 2)) & 0xFFFFFF);
+ // Fill context
+ lac_set_rad_tag_tunnel_type(tag, ntohl(*(uint32_t *)(p + 2)) & 0xFFFFFF);
+ /* Request open tunnel to remote LNS*/
+ OpentunnelReq = 1;
+ }
+ else if (*p == 65)
+ {
+ // Tunnel-Medium-Type
+ if (p[1] < 6) continue;
+ tag = p[2];
+ LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Medium-Type:%d %d\n",
+ tag, ntohl(*(uint32_t *)(p + 2)) & 0xFFFFFF);
+ // Fill context
+ lac_set_rad_tag_tunnel_medium_type(tag, ntohl(*(uint32_t *)(p + 2)) & 0xFFFFFF);
+ }
+ else if (*p == 67)
+ {
+ // Tunnel-Server-Endpoint
+ if (p[1] < 3) continue;
+ tag = p[2];
+ //If the Tag field is greater than 0x1F,
+ // it SHOULD be interpreted as the first byte of the following String field.
+ memset(strtemp, 0, 256);
+ if (tag > 0x1F)
+ {
+ tag = 0;
+ memcpy(strtemp, (p + 2), p[1]-2);
+ }
+ else
+ memcpy(strtemp, (p + 3), p[1]-3);
+
+ LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Server-Endpoint:%d %s\n", tag, strtemp);
+ // Fill context
+ lac_set_rad_tag_tunnel_serv_endpt(tag, (char *) strtemp);
+ }
+ else if (*p == 69)
+ {
+ // Tunnel-Password
+ size_t lentemp;
+
+ if (p[1] < 5) continue;
+ tag = p[2];
+
+ memset(strtemp, 0, 256);
+ lentemp = p[1]-3;
+ memcpy(strtemp, (p + 3), lentemp);
+ if (!rad_tunnel_pwdecode(strtemp, &lentemp, config->radiussecret, radius[r].auth))
+ {
+ LOG_HEX(3, "Error Decode Tunnel-Password, Dump Radius reponse:", p, p[1]);
+ continue;
+ }
+
+ LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Password:%d %s\n", tag, strtemp);
+ if (strlen((char *) strtemp) > 63)
+ {
+ LOG(1, s, session[s].tunnel, "tunnel password is too long (>63)\n");
+ continue;
+ }
+ // Fill context
+ lac_set_rad_tag_tunnel_password(tag, (char *) strtemp);
+ }
+ else if (*p == 82)
+ {
+ // Tunnel-Assignment-Id
+ if (p[1] < 3) continue;
+ tag = p[2];
+ //If the Tag field is greater than 0x1F,
+ // it SHOULD be interpreted as the first byte of the following String field.
+ memset(strtemp, 0, 256);
+ if (tag > 0x1F)
+ {
+ tag = 0;
+ memcpy(strtemp, (p + 2), p[1]-2);
+ }
+ else
+ memcpy(strtemp, (p + 3), p[1]-3);
+
+ LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Assignment-Id:%d %s\n", tag, strtemp);
+ // Fill context
+ lac_set_rad_tag_tunnel_assignment_id(tag, (char *) strtemp);
+ }
}
}
else if (r_code == AccessReject)
break;
}
+ if ((!config->disable_lac_func) && OpentunnelReq)
+ {
+ char assignment_id[256];
+ // Save radius tag context to conf
+ lac_save_rad_tag_tunnels(s);
+
+ memset(assignment_id, 0, 256);
+ if (!lac_rad_select_assignment_id(s, assignment_id))
+ break; // Error no assignment_id
+
+ LOG(3, s, session[s].tunnel, "Select Tunnel Remote LNS for assignment_id == %s\n", assignment_id);
+
+ if (lac_rad_forwardtoremotelns(s, assignment_id, session[s].user))
+ {
+ int ro;
+ // Sanity check, no local IP to session forwarded
+ session[s].ip = 0;
+ for (ro = 0; r < MAXROUTE && session[s].route[ro].ip; r++)
+ {
+ session[s].route[ro].ip = 0;
+ }
+ break;
+ }
+ }
+
+ // process auth response
+ if (radius[r].chap)
+ {
+ // CHAP
+ uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP, 0, 0, 0);
+ if (!p) return; // Abort!
+
+ *p = (r_code == AccessAccept) ? 3 : 4; // ack/nak
+ p[1] = radius[r].id;
+ *(uint16_t *) (p + 2) = ntohs(4); // no message
+ tunnelsend(b, (p - b) + 4, t); // send it
+
+ LOG(3, s, session[s].tunnel, " CHAP User %s authentication %s.\n", session[s].user,
+ (r_code == AccessAccept) ? "allowed" : "denied");
+ }
+ else
+ {
+ // PAP
+ uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP, 0, 0, 0);
+ if (!p) return; // Abort!
+
+ // ack/nak
+ *p = r_code;
+ p[1] = radius[r].id;
+ *(uint16_t *) (p + 2) = ntohs(5);
+ p[4] = 0; // no message
+ tunnelsend(b, (p - b) + 5, t); // send it
+
+ LOG(3, s, session[s].tunnel, " PAP User %s authentication %s.\n", session[s].user,
+ (r_code == AccessAccept) ? "allowed" : "denied");
+ }
+
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));
}
// Valid Session, set it up
session[s].unique_id = 0;
- sessionsetup(t, s);
+ sessionsetup(s, t);
}
else
{
switch (radius[r].state)
{
case RADIUSCHAP: // sending CHAP down PPP
- sendchap(t, s);
- break;
- case RADIUSIPCP:
- sendipcp(t, s); // send IPCP
+ sendchap(s, t);
break;
case RADIUSAUTH: // sending auth to RADIUS server
- radiussend(r, RADIUSAUTH);
- break;
+ case RADIUSJUSTAUTH: // sending auth to RADIUS server
case RADIUSSTART: // sending start accounting to RADIUS server
- radiussend(r, RADIUSSTART);
- break;
case RADIUSSTOP: // sending stop accounting to RADIUS server
- radiussend(r, RADIUSSTOP);
- break;
case RADIUSINTERIM: // sending interim accounting to RADIUS server
- radiussend(r, RADIUSINTERIM);
+ radiussend(r, radius[r].state);
break;
default:
case RADIUSNULL: // Not in use
break;
}
}
+
+extern int daefd;
+
+void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
+{
+ int i, r_code, r_id, length, attribute_length;
+ uint8_t *packet, attribute;
+ hasht hash;
+ 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
+ calc_auth(buf, len, zero, hash);
+ if (memcmp(hash, buf + 4, 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", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // 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;
+ // skip len + auth
+ packet += 2 + 16;
+ len = packet - buf;
+
+ // 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
+ calc_auth(buf, len, hash, buf + 4);
+
+ LOG(3, 0, 0, "Sending DAE %s, id=%d\n", radius_code(r_code), r_id);
+
+ // send DAE response
+ if (sendtofrom(daefd, buf, len, MSG_DONTWAIT | MSG_NOSIGNAL, (struct sockaddr *) addr, alen, local) < 0)
+ LOG(0, 0, 0, "Error sending DAE response packet: %s\n", strerror(errno));
+}
+
+// Decrypte the encrypted Tunnel Password.
+// Defined in RFC-2868.
+// the pl2tpsecret buffer must set to 256 characters.
+// return 0 on decoding error else length of decoded l2tpsecret
+int rad_tunnel_pwdecode(uint8_t *pl2tpsecret, size_t *pl2tpsecretlen,
+ const char *radiussecret, const uint8_t * auth)
+{
+ MD5_CTX ctx, oldctx;
+ hasht hash;
+ int secretlen;
+ unsigned i, n, len, decodedlen;
+
+/* 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 6 7
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Salt | Salt | String ..........
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+*/
+
+ len = *pl2tpsecretlen;
+
+ if (len < 2)
+ {
+ LOG(1, 0, 0, "tunnel password is too short, We need at least a salt\n");
+ return 0;
+ }
+
+ if (len <= 3)
+ {
+ pl2tpsecret[0] = 0;
+ *pl2tpsecretlen = 0;
+ LOG(1, 0, 0, "tunnel passwd is empty !!!\n");
+ return 0;
+ }
+
+ len -= 2; /* discount the salt */
+
+ //Use the secret to setup the decryption
+ secretlen = strlen(radiussecret);
+
+ MD5_Init(&ctx);
+ MD5_Update(&ctx, (void *) radiussecret, secretlen);
+ oldctx = ctx; /* save intermediate work */
+
+ // Set up the initial key:
+ // b(1) = MD5(radiussecret + auth + salt)
+ MD5_Update(&ctx, (void *) auth, 16);
+ MD5_Update(&ctx, pl2tpsecret, 2);
+
+ decodedlen = 0;
+ for (n = 0; n < len; n += 16)
+ {
+ int base = 0;
+
+ if (n == 0)
+ {
+ MD5_Final(hash, &ctx);
+
+ ctx = oldctx;
+
+ // the first octet, it's the 'data_len'
+ // Check is correct
+ decodedlen = pl2tpsecret[2] ^ hash[0];
+ if (decodedlen >= len)
+ {
+ LOG(1, 0, 0, "tunnel password is too long !!!\n");
+ return 0;
+ }
+
+ MD5_Update(&ctx, pl2tpsecret + 2, 16);
+ base = 1;
+ } else
+ {
+ MD5_Final(hash, &ctx);
+
+ ctx = oldctx;
+ MD5_Update(&ctx, pl2tpsecret + n + 2, 16);
+ }
+
+ for (i = base; i < 16; i++)
+ {
+ pl2tpsecret[n + i - 1] = pl2tpsecret[n + i + 2] ^ hash[i];
+ }
+ }
+
+ if (decodedlen > 239) decodedlen = 239;
+
+ *pl2tpsecretlen = decodedlen;
+ pl2tpsecret[decodedlen] = 0;
+
+ return decodedlen;
+};
projects / l2tpns.git / blobdiff