// L2TPNS Radius Stuff
-// $Id: radius.c,v 1.2 2004-03-05 00:09:03 fred_nerk 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>
#include <sys/socket.h>
#include <malloc.h>
#include <string.h>
+#include <fcntl.h>
#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;
extern tunnelt *tunnel;
-extern u32 sessionid;
-extern int radfd;
-extern struct Tstats *_statistics;
-extern struct configt *config;
-
-const char *radius_state(int state)
-{
- static char *tmp = NULL;
- int i;
- for (i = 0; radius_states[i]; i++)
- if (i == state) return radius_states[i];
-
- if (tmp == NULL) tmp = (char *)calloc(64, 1);
- sprintf(tmp, "%d", state);
- return tmp;
-}
+extern configt *config;
+extern int *radfds;
+extern ip_filtert *ip_filters;
// Set up socket for radius requests
void initrad(void)
{
- radfd = socket(AF_INET, SOCK_DGRAM, UDP);
+ int 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);
+ flags = fcntl(radfds[i], F_GETFL, 0);
+ fcntl(radfds[i], F_SETFL, flags | O_NONBLOCK);
+ }
}
-void radiusclear(u8 r, sessionidt s)
+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;
}
-static u8 new_radius()
+static uint16_t get_free_radius()
{
- u8 i;
- for (i = 1; i < MAXRADIUS; i++)
+ int count;
+ static uint32_t next_radius_id = 0;
+
+ for (count = MAXRADIUS; count > 0; --count)
{
- if (radius[i].state == RADIUSNULL)
- return i;
+ ++next_radius_id; // Find the next ID to check.
+ if (next_radius_id >= MAXRADIUS)
+ next_radius_id = 1;
+
+ if (radius[next_radius_id].state == RADIUSNULL)
+ {
+ return next_radius_id;
+ }
}
- log(0, 0, 0, 0, "Can't find a free radius session! This could be bad!\n");
+
+ LOG(0, 0, 0, "Can't find a free radius session! This is very bad!\n");
return 0;
}
-u8 radiusnew(sessionidt s)
+uint16_t radiusnew(sessionidt s)
{
- u8 r;
- if (!(r = new_radius()))
+ uint16_t r = sess_local[s].radius;
+
+ /* re-use */
+ if (r)
+ {
+ LOG(3, s, session[s].tunnel, "Re-used radius %d\n", r);
+ return r;
+ }
+
+ if (!(r = get_free_radius()))
{
- log(1, 0, s, session[s].tunnel, "No free RADIUS sessions\n");
+ LOG(1, s, session[s].tunnel, "No free RADIUS sessions\n");
STAT(radius_overflow);
return 0;
};
+
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;
}
// Send a RADIUS request
-void radiussend(u8 r, u8 state)
+void radiussend(uint16_t r, uint8_t state)
{
struct sockaddr_in addr;
- u8 b[4096]; // RADIUS packet
+ uint8_t b[4096]; // RADIUS packet
char pass[129];
int pl;
- u8 *p;
+ uint8_t *p;
sessionidt s;
-#ifdef STAT_CALLS
- STAT(call_radiussend);
-#endif
+
+ CSTAT(radiussend);
+
s = radius[r].session;
if (!config->numradiusservers)
{
- log(0, 0, s, session[s].tunnel, "No RADIUS servers\n");
+ LOG(0, s, session[s].tunnel, "No RADIUS servers\n");
return;
}
if (!*config->radiussecret)
{
- log(0, 0, s, session[s].tunnel, "No RADIUS secret\n");
+ LOG(0, s, session[s].tunnel, "No RADIUS secret\n");
return;
}
if (radius[r].state != state)
radius[r].try = 0;
+
radius[r].state = state;
- radius[r].retry = backoff(radius[r].try++);
- log(4, 0, s, session[s].tunnel, "Send RADIUS %d state %s try %d\n", r, radius_state(radius[r].state), 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);
+
if (radius[r].try > config->numradiusservers * 2)
{
if (s)
{
- sessionshutdown(s, "RADIUS timeout");
+ if (state == RADIUSAUTH)
+ 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",
+ radius_state(state));
+ radiusclear(r, s);
+ }
STAT(radius_timeout);
}
else
radius[r].state = RADIUSWAIT;
radius[r].retry = 100;
}
- return ;
+ return;
}
// contruct RADIUS access request
switch (state)
{
- case RADIUSAUTH:
- b[0] = 1; // access request
- break;
- case RADIUSSTART:
- case RADIUSSTOP:
- b[0] = 4; // accounting request
- break;
- default:
- log(0, 0, 0, 0, "Unknown radius state %d\n", state);
+ case RADIUSAUTH:
+ b[0] = AccessRequest; // access request
+ break;
+ case RADIUSSTART:
+ case RADIUSSTOP:
+ case RADIUSINTERIM:
+ b[0] = AccountingRequest; // accounting request
+ break;
+ default:
+ LOG(0, 0, 0, "Unknown radius state %d\n", state);
}
- b[1] = r; // identifier
+ 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)
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)
- { // accounting
- *p = 40; // accounting type
+ else if (state == RADIUSSTART || state == RADIUSSTOP || state == RADIUSINTERIM)
+ { // accounting
+ *p = 40; // accounting type
p[1] = 6;
- *(u32 *) (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;
- *(u32 *) (p + 2) = htonl(session[s].cin);
+ *(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
p += p[1];
- *p = 43; // output octets
+ sess_local[s].last_interim = time_now; // Setup "first" Interim
+ }
+ else
+ { // stop, interim
+ *p = 42; // input octets
p[1] = 6;
- *(u32 *) (p + 2) = htonl(session[s].cout);
+ *(uint32_t *) (p + 2) = htonl(session[s].cin);
p += p[1];
- *p = 46; // session time
+
+ *p = 43; // output octets
p[1] = 6;
- *(u32 *) (p + 2) = htonl(time(NULL) - session[s].opened);
+ *(uint32_t *) (p + 2) = htonl(session[s].cout);
p += p[1];
- *p = 47; // input packets
+
+ *p = 46; // session time
p[1] = 6;
- *(u32 *) (p + 2) = htonl(session[s].pin);
+ *(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
p += p[1];
- *p = 48; // output spackets
+
+ *p = 47; // input packets
p[1] = 6;
- *(u32 *) (p + 2) = htonl(session[s].pout);
+ *(uint32_t *) (p + 2) = htonl(session[s].pin);
p += p[1];
- }
- else
- { // start
- *p = 41; // delay
+
+ *p = 48; // output packets
p[1] = 6;
- *(u32 *) (p + 2) = htonl(time(NULL) - session[s].opened);
+ *(uint32_t *) (p + 2) = htonl(session[s].pout);
+ p += p[1];
+
+ *p = 52; // input gigawords
+ p[1] = 6;
+ *(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];
}
}
{
*p = 5; // NAS-Port
p[1] = 6;
- *(u32 *) (p + 2) = htonl(s);
+ *(uint32_t *) (p + 2) = htonl(s);
p += p[1];
}
if (s && session[s].ip)
{
*p = 8; // Framed-IP-Address
p[1] = 6;
- *(u32 *) (p + 2) = htonl(session[s].ip);
+ *(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);
- 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
*p = 4;
p[1] = 6;
- *(u32 *)(p + 2) = config->bind_address;
+ *(uint32_t *)(p + 2) = config->bind_address;
p += p[1];
// All AVpairs added
- *(u16 *) (b + 2) = htons(p - b);
+ *(uint16_t *) (b + 2) = htons(p - b);
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);
}
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
- *(u32 *) & addr.sin_addr = config->radiusserver[(radius[r].try - 1) % config->numradiusservers];
- addr.sin_port = htons((state == RADIUSAUTH) ? RADPORT : RADAPORT);
+ *(uint32_t *) & addr.sin_addr = config->radiusserver[(radius[r].try - 1) % config->numradiusservers];
+ {
+ // 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);
+ }
+
+ 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;
+ }
- log_hex(5, "RADIUS Send", b, (p - b));
- sendto(radfd, b, p - b, 0, (void *) &addr, sizeof(addr));
+ // 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(u8 * buf, int len)
+void processrad(uint8_t *buf, int len, char socket_index)
{
- u8 b[MAXCONTROL];
+ uint8_t b[MAXCONTROL];
MD5_CTX ctx;
- u8 r;
+ uint16_t r;
sessionidt s;
tunnelidt t = 0;
hasht hash;
- u8 routes = 0;
+ uint8_t routes = 0;
+ int r_code;
+ int r_id;
+
+ CSTAT(processrad);
-#ifdef STAT_CALLS
- STAT(call_processrad);
-#endif
- log_hex(5, "RADIUS Response", buf, len);
- if (len < 20 || len < ntohs(*(u16 *) (buf + 2)))
+ LOG_HEX(5, "RADIUS Response", buf, len);
+ if (len < 20 || len < ntohs(*(uint16_t *) (buf + 2)))
{
- log(1, 0, 0, 0, "Duff RADIUS response length %d\n", len);
+ LOG(1, 0, 0, "Duff RADIUS response length %d\n", len);
return ;
}
- len = ntohs(*(u16 *) (buf + 2));
- r = buf[1];
+
+ r_code = buf[0]; // response type
+ r_id = buf[1]; // radius reply indentifier.
+
+ len = ntohs(*(uint16_t *) (buf + 2));
+ r = socket_index | (r_id << RADIUS_SHIFT);
s = radius[r].session;
- log(3, 0, s, session[s].tunnel, "Received %s, radius %d response for session %u\n", radius_states[radius[r].state], r, s);
+ LOG(3, s, session[s].tunnel, "Received %s, radius %d response for session %u (%s, id %d)\n",
+ radius_state(radius[r].state), r, s, radius_code(r_code), r_id);
+
if (!s && radius[r].state != RADIUSSTOP)
{
- log(1, 0, s, session[s].tunnel, " Unexpected RADIUS response\n");
+ 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, 0, s, session[s].tunnel, " Unexpected RADIUS response\n");
+ 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))
{
- log(0, 0, s, session[s].tunnel, " Incorrect auth on RADIUS response\n");
- radius[r].state = RADIUSWAIT;
- break;
+ LOG(0, s, session[s].tunnel, " Incorrect auth on RADIUS response!! (wrong secret in radius config?)\n");
+ return; // Do nothing. On timeout, it will try the next radius server.
}
- if ((radius[r].state == RADIUSAUTH && *buf != 2 && *buf != 3) ||
- ((radius[r].state == RADIUSSTART || radius[r].state == RADIUSSTOP) && *buf != 5))
+
+ if ((radius[r].state == RADIUSAUTH && r_code != AccessAccept && r_code != AccessReject) ||
+ ((radius[r].state == RADIUSSTART || radius[r].state == RADIUSSTOP || radius[r].state == RADIUSINTERIM) && r_code != AccountingResponse))
{
- log(1, 0, s, session[s].tunnel, " Unexpected RADIUS response %d\n", *buf);
- radius[r].state = RADIUSWAIT;
- break;
+ 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
+ // care off finishing the radius session if that's really correct.
}
+
if (radius[r].state == RADIUSAUTH)
{
- log(4, 0, s, session[s].tunnel, " Original response is \"%s\"\n", (*buf == 2) ? "accept" : "reject");
+ // run post-auth plugin
+ struct param_post_auth packet = {
+ &tunnel[t],
+ &session[s],
+ session[s].user,
+ (r_code == AccessAccept),
+ radius[r].chap ? PPPCHAP : PPPPAP
+ };
+
+ run_plugins(PLUGIN_POST_AUTH, &packet);
+ r_code = packet.auth_allowed ? AccessAccept : AccessReject;
+
// process auth response
if (radius[r].chap)
{
// CHAP
- u8 *p = makeppp(b, 0, 0, t, s, PPPCHAP);
+ uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPCHAP);
+ if (!p) return; // Abort!
- {
- struct param_post_auth packet = { &tunnel[t], &session[s], session[s].user, (*buf == 2), PPPCHAP };
- run_plugins(PLUGIN_POST_AUTH, &packet);
- *buf = packet.auth_allowed ? 2 : 3;
- }
-
- log(3, 0, s, session[s].tunnel, " CHAP User %s authentication %s.\n", session[s].user,
- (*buf == 2) ? "allowed" : "denied");
- *p = (*buf == 2) ? 3 : 4; // ack/nak
+ *p = (r_code == AccessAccept) ? 3 : 4; // ack/nak
p[1] = radius[r].id;
- *(u16 *) (p + 2) = ntohs(4); // no message
+ *(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
- u8 *p = makeppp(b, 0, 0, t, s, PPPPAP);
+ uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP);
+ if (!p) return; // Abort!
- {
- struct param_post_auth packet = { &tunnel[t], &session[s], session[s].user, (*buf == 2), PPPPAP };
- run_plugins(PLUGIN_POST_AUTH, &packet);
- *buf = packet.auth_allowed ? 2 : 3;
- }
-
- log(3, 0, s, session[s].tunnel, " PAP User %s authentication %s.\n", session[s].user,
- (*buf == 2) ? "allowed" : "denied");
// ack/nak
- *p = *buf;
+ *p = r_code;
p[1] = radius[r].id;
- *(u16 *) (p + 2) = ntohs(5);
+ *(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 (*buf == 2)
+ if (r_code == AccessAccept)
{
// Login successful
// Extract IP, routes, etc
- u8 *p = buf + 20;
- u8 *e = buf + len;
- for (p = buf + 20; p < e && p[1]; p += p[1])
+ uint8_t *p = buf + 20;
+ uint8_t *e = buf + len;
+ for (; p + 2 <= e && p[1] && p + p[1] <= e; p += p[1])
{
if (*p == 8)
{
- // Statically assigned address
- log(3, 0, s, session[s].tunnel, " Radius reply contains IP address %s\n", inet_toa(*(u32 *) (p + 2)));
- session[s].ip = ntohl(*(u32 *) (p + 2));
+ // Framed-IP-Address
+ if (p[1] < 6) continue;
+ session[s].ip = ntohl(*(uint32_t *) (p + 2));
+ session[s].ip_pool_index = -1;
+ LOG(3, s, session[s].tunnel, " Radius reply contains IP address %s\n",
+ fmtaddr(htonl(session[s].ip), 0));
+
+ if (session[s].ip == 0xFFFFFFFE)
+ session[s].ip = 0; // assign from pool
}
else if (*p == 135)
{
// DNS address
- log(3, 0, s, session[s].tunnel, " Radius reply contains primary DNS address %s\n", inet_toa(ntohl(*(u32 *) (p + 2))));
- session[s].dns1 = ntohl(*(u32 *) (p + 2));
+ if (p[1] < 6) continue;
+ session[s].dns1 = ntohl(*(uint32_t *) (p + 2));
+ LOG(3, s, session[s].tunnel, " Radius reply contains primary DNS address %s\n",
+ fmtaddr(htonl(session[s].dns1), 0));
}
else if (*p == 136)
{
// DNS address
- log(3, 0, s, session[s].tunnel, " Radius reply contains secondary DNS address %s\n", inet_toa(ntohl(*(u32 *) (p + 2))));
- session[s].dns2 = ntohl(*(u32 *) (p + 2));
+ if (p[1] < 6) continue;
+ session[s].dns2 = ntohl(*(uint32_t *) (p + 2));
+ LOG(3, s, session[s].tunnel, " Radius reply contains secondary DNS address %s\n",
+ fmtaddr(htonl(session[s].dns2), 0));
}
else if (*p == 22)
{
- // framed-route
- ipt ip = 0, mask = 0;
- u8 u = 0;
- u8 bits = 0;
- u8 *n = p + 2;
- u8 *e = p + p[1];
+ // Framed-Route
+ in_addr_t ip = 0, mask = 0;
+ uint8_t u = 0;
+ uint8_t bits = 0;
+ uint8_t *n = p + 2;
+ uint8_t *e = p + p[1];
while (n < e && (isdigit(*n) || *n == '.'))
{
if (*n == '.')
mask = 0xFFFF0000;
else
mask = 0xFFFFFF00;
+
if (routes == MAXROUTE)
{
- log(1, 0, s, session[s].tunnel, " Too many routes\n");
+ LOG(1, s, session[s].tunnel, " Too many routes\n");
}
- else
+ else if (ip)
{
- log(3, 0, s, session[s].tunnel, " Radius reply contains route for %d/%d\n",
- inet_toa(ip),
- inet_toa(mask));
+ LOG(3, s, session[s].tunnel, " Radius reply contains route for %s/%s\n",
+ fmtaddr(htonl(ip), 0), fmtaddr(htonl(mask), 1));
+
session[s].route[routes].ip = ip;
session[s].route[routes].mask = mask;
routes++;
}
}
- else if (*p == 26)
+ else if (*p == 11)
+ {
+ // Filter-Id
+ char *filter = (char *) p + 2;
+ int l = p[1] - 2;
+ char *suffix;
+ 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))
+ fp = &session[s].filter_in;
+ else if (l - b == 4 && !memcmp("out", suffix+1, 3))
+ fp = &session[s].filter_out;
+
+ l = b;
+ }
+
+ if (!fp)
+ {
+ LOG(3, s, session[s].tunnel, " Invalid filter\n");
+ continue;
+ }
+
+ 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;
- log(3, 0, s, session[s].tunnel, " Radius reply contains Vendor-Specific. Vendor=%d Attrib=%d Length=%d\n", vendor, attrib, attrib_length);
- if (attrib_length == 0) continue;
- if (attrib != 1)
- log(3, 0, s, session[s].tunnel, " Unknown vendor-specific\n");
- else
+ 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)
{
- char *avpair, *value, *key, *newp;
- avpair = key = calloc(attrib_length + 1, 1);
- memcpy(avpair, p + 8, attrib_length);
- log(3, 0, 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);
+ LOG(3, s, session[s].tunnel, " Unknown vendor-specific\n");
+ continue;
+ }
+
+ if (attrib_length > 0)
+ {
+ LOG(3, s, session[s].tunnel, " Cisco-AVPair value: %.*s\n",
+ attrib_length, p + 8);
+
+ handle_avpair(s, p + 8, attrib_length);
+ }
+ }
+ else if (*p == 99)
+ {
+ // Framed-IPv6-Route
+ struct in6_addr r6;
+ int prefixlen;
+ uint8_t *n = p + 2;
+ uint8_t *e = p + p[1];
+ uint8_t *m = memchr(n, '/', e - p);
+
+ *m++ = 0;
+ inet_pton(AF_INET6, (char *) n, &r6);
+
+ prefixlen = 0;
+ while (m < e && isdigit(*m)) {
+ prefixlen = prefixlen * 10 + *m++ - '0';
+ }
+
+ 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;
}
}
}
}
- else if (*buf == 3)
+ else if (r_code == AccessReject)
{
- log(2, 0, s, session[s].tunnel, " Authentication denied for %s\n", session[s].user);
+ LOG(2, s, session[s].tunnel, " Authentication rejected for %s\n", session[s].user);
+ sessionkill(s, "Authentication rejected");
break;
}
- // Check for Assign-IP-Address
- if (!session[s].ip || session[s].ip == 0xFFFFFFFE)
- {
- assign_ip_address(s);
- if (session[s].ip)
- log(3, 0, s, t, " No IP allocated by radius. Assigned %s from pool\n",
- inet_toa(htonl(session[s].ip)));
- else
- log(3, 0, s, t, " No IP allocated by radius. None available in pool\n");
- }
if (!session[s].dns1 && config->default_dns1)
{
- session[s].dns1 = htonl(config->default_dns1);
- log(3, 0, s, t, " Sending dns1 = %s\n", inet_toa(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);
- log(3, 0, s, t, " Sending dns2 = %s\n", inet_toa(config->default_dns2));
+ session[s].dns2 = ntohl(config->default_dns2);
+ LOG(3, s, t, " Sending dns2 = %s\n", fmtaddr(config->default_dns2, 0));
}
- if (session[s].ip)
- {
- // Valid Session, set it up
- session[s].sid = 0;
- sessionsetup(t, s, routes);
- }
- else
- {
- log(0, 0, s, t, " End of processrad(), but no valid session exists.\n");
- sessionkill(s, "Can't create valid session");
- }
+ // Valid Session, set it up
+ session[s].unique_id = 0;
+ sessionsetup(t, s);
}
else
{
- log(3, 0, s, t, " RADIUS response in state %d\n", radius[r].state);
+ // An ack for a stop or start record.
+ LOG(3, s, t, " RADIUS accounting ack recv in state %s\n", radius_state(radius[r].state));
+ break;
}
} while (0);
}
// Send a retry for RADIUS/CHAP message
-void radiusretry(u8 r)
+void radiusretry(uint16_t r)
{
sessionidt s = radius[r].session;
tunnelidt t = 0;
-#ifdef STAT_CALLS
- STAT(call_radiusretry);
-#endif
- if (s)
- t = session[s].tunnel;
- radius[r].retry = 0;
+
+ CSTAT(radiusretry);
+
+ if (s) t = session[s].tunnel;
+
switch (radius[r].state)
{
- 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);
- break;
- default:
- 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, 0, s, session[s].tunnel, "Freeing up radius session %d\n", r);
- break;
+ case RADIUSCHAP: // sending CHAP down PPP
+ sendchap(t, s);
+ break;
+ 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
+ // free up RADIUS task
+ radiusclear(r, s);
+ LOG(3, s, session[s].tunnel, "Freeing up radius session %d\n", r);
+ break;
}
}
-void radius_clean()
+extern int daefd;
+
+void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen)
{
- int i;
+ 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(1, 0, 0, 0, "Cleaning radius session array\n");
+ LOG(3, 0, 0, "DAE request from %s\n", fmtaddr(addr->sin_addr.s_addr, 0));
+ LOG_HEX(5, "DAE Request", buf, len);
- for (i = 1; i < MAXRADIUS; i++)
+ if (len < 20 || len < ntohs(*(uint16_t *) (buf + 2)))
{
- if (radius[i].retry == 0
- || !session[radius[i].session].opened
- || session[radius[i].session].die
- || session[radius[i].session].tunnel == 0)
- radiusclear(i, 0);
+ 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));
}
projects / l2tpns.git / blobdiff