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more DoS prevention: add packet_limit option to apply a hard limit to downstream...
[l2tpns.git] / radius.c
diff --git a/radius.c b/radius.c
index 76c8a2e..ff52cdc 100644 (file)
--- a/radius.c
+++ b/radius.c
@@ -1,6 +1,6 @@
 // L2TPNS Radius Stuff
 
 // L2TPNS Radius Stuff
 
-char const *cvs_id_radius = "$Id: radius.c,v 1.20 2004/12/16 08:49:53 bodea Exp $";
+char const *cvs_id_radius = "$Id: radius.c,v 1.22 2005/01/05 14:35:01 bodea Exp $";
 
 #include <time.h>
 #include <stdio.h>
 
 #include <time.h>
 #include <stdio.h>
@@ -25,18 +25,6 @@ extern configt *config;
 extern int *radfds;
 extern ip_filtert *ip_filters;
 
 extern int *radfds;
 extern ip_filtert *ip_filters;
 
-static 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;
-}
-
 // Set up socket for radius requests
 void initrad(void)
 {
 // Set up socket for radius requests
 void initrad(void)
 {
@@ -58,7 +46,6 @@ void radiusclear(uint16_t r, sessionidt s)
        memset(&radius[r], 0, sizeof(radius[r])); // radius[r].state = RADIUSNULL;
 }
 
        memset(&radius[r], 0, sizeof(radius[r])); // radius[r].state = RADIUSNULL;
 }
 
-
 static uint16_t get_free_radius()
 {
        int count;
 static uint16_t get_free_radius()
 {
        int count;
@@ -118,7 +105,7 @@ void radiussend(uint16_t r, uint8_t state)
        uint8_t *p;
        sessionidt s;
 
        uint8_t *p;
        sessionidt s;
 
-       CSTAT(call_radiussend);
+       CSTAT(radiussend);
 
        s = radius[r].session;
        if (!config->numradiusservers)
 
        s = radius[r].session;
        if (!config->numradiusservers)
@@ -141,6 +128,7 @@ void radiussend(uint16_t r, uint8_t state)
 
        if (radius[r].state != state)
                radius[r].try = 0;
 
        if (radius[r].state != state)
                radius[r].try = 0;
+
        radius[r].state = state;
        radius[r].retry = backoff(radius[r].try++);
        LOG(4, s, session[s].tunnel, "Send RADIUS id %d sock %d state %s try %d\n",
        radius[r].state = state;
        radius[r].retry = backoff(radius[r].try++);
        LOG(4, s, session[s].tunnel, "Send RADIUS id %d sock %d state %s try %d\n",
@@ -156,7 +144,7 @@ void radiussend(uint16_t r, uint8_t state)
                        else
                        {
                                LOG(1, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n",
                        else
                        {
                                LOG(1, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n",
-                                       radius_states[state]);
+                                       radius_state(state));
                                radiusclear(r, s);
                        }
                        STAT(radius_timeout);
                                radiusclear(r, s);
                        }
                        STAT(radius_timeout);
@@ -167,7 +155,7 @@ void radiussend(uint16_t r, uint8_t state)
                        radius[r].state = RADIUSWAIT;
                        radius[r].retry = 100;
                }
                        radius[r].state = RADIUSWAIT;
                        radius[r].retry = 100;
                }
-               return ;
+               return;
        }
        // contruct RADIUS access request
        switch (state)
        }
        // contruct RADIUS access request
        switch (state)
@@ -349,9 +337,7 @@ void radiussend(uint16_t r, uint8_t state)
        {
                // get radius port
                uint16_t port = config->radiusport[(radius[r].try - 1) % config->numradiusservers];
        {
                // get radius port
                uint16_t port = config->radiusport[(radius[r].try - 1) % config->numradiusservers];
-               // no need to define the accounting port for itself:
-               //  the accounting port is as far as I know always one more
-               //  than the auth port    JK 20040713
+               // assume RADIUS accounting port is the authentication port +1
                addr.sin_port = htons((state == RADIUSAUTH) ? port : port+1);
        }
 
                addr.sin_port = htons((state == RADIUSAUTH) ? port : port+1);
        }
 
@@ -369,14 +355,10 @@ void processrad(uint8_t *buf, int len, char socket_index)
        tunnelidt t = 0;
        hasht hash;
        uint8_t routes = 0;
        tunnelidt t = 0;
        hasht hash;
        uint8_t routes = 0;
+       int r_code;
+       int r_id;
 
 
-       int r_code, r_id ; // Radius code.
-
-       r_code = buf[0]; // First byte in radius packet.
-       r_id = buf[1]; // radius reply indentifier.
-
-
-       CSTAT(call_processrad);
+       CSTAT(processrad);
 
        LOG_HEX(5, "RADIUS Response", buf, len);
        if (len < 20 || len < ntohs(*(uint16_t *) (buf + 2)))
 
        LOG_HEX(5, "RADIUS Response", buf, len);
        if (len < 20 || len < ntohs(*(uint16_t *) (buf + 2)))
@@ -384,11 +366,16 @@ void processrad(uint8_t *buf, int len, char socket_index)
                LOG(1, 0, 0, "Duff RADIUS response length %d\n", len);
                return ;
        }
                LOG(1, 0, 0, "Duff RADIUS response length %d\n", len);
                return ;
        }
+
+       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;
        len = ntohs(*(uint16_t *) (buf + 2));
        r = socket_index | (r_id << RADIUS_SHIFT);
        s = radius[r].session;
-       LOG(3, s, session[s].tunnel, "Received %s, radius %d response for session %u (code %d, id %d)\n",
-                       radius_states[radius[r].state], r, s, r_code, r_id);
+       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, s, session[s].tunnel, "   Unexpected RADIUS response\n");
        if (!s && radius[r].state != RADIUSSTOP)
        {
                LOG(1, s, session[s].tunnel, "   Unexpected RADIUS response\n");
@@ -412,16 +399,29 @@ void processrad(uint8_t *buf, int len, char socket_index)
                        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.
                }
                        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) && r_code != AccountingResponse))
                {
                {
-                       LOG(1, s, session[s].tunnel, "   Unexpected RADIUS response %d\n", *buf);
+                       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.
                }
                        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)
                {
                if (radius[r].state == RADIUSAUTH)
                {
-                       LOG(4, 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)
                        {
                        // process auth response
                        if (radius[r].chap)
                        {
@@ -429,18 +429,13 @@ void processrad(uint8_t *buf, int len, char socket_index)
                                uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPCHAP);
                                if (!p) return; // Abort!
 
                                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, 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;
                                *(uint16_t *) (p + 2) = ntohs(4); // no message
                                tunnelsend(b, (p - b) + 4, t); // send it
                                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
                        {
                        }
                        else
                        {
@@ -448,23 +443,18 @@ void processrad(uint8_t *buf, int len, char socket_index)
                                uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP);
                                if (!p) return;         // Abort!
 
                                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, s, session[s].tunnel, "   PAP User %s authentication %s.\n", session[s].user,
-                                               (*buf == 2) ? "allowed" : "denied");
                                // ack/nak
                                // ack/nak
-                               *p = *buf;
+                               *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
                                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 (*buf == 2)
+                       if (r_code == AccessAccept)
                        {
                                // Login successful
                                // Extract IP, routes, etc
                        {
                                // Login successful
                                // Extract IP, routes, etc
@@ -631,7 +621,7 @@ void processrad(uint8_t *buf, int len, char socket_index)
                                        }
                                }
                        }
                                        }
                                }
                        }
-                       else if (*buf == 3)
+                       else if (r_code == AccessReject)
                        {
                                LOG(2, s, session[s].tunnel, "   Authentication denied for %s\n", session[s].user);
 //FIXME: We should tear down the session here!
                        {
                                LOG(2, s, session[s].tunnel, "   Authentication denied for %s\n", session[s].user);
 //FIXME: We should tear down the session here!
@@ -656,7 +646,7 @@ void processrad(uint8_t *buf, int len, char socket_index)
                else
                {
                                // An ack for a stop or start record.
                else
                {
                                // An ack for a stop or start record.
-                       LOG(3, s, t, "   RADIUS accounting ack recv in state %s\n", radius_states[radius[r].state]);
+                       LOG(3, s, t, "   RADIUS accounting ack recv in state %s\n", radius_state(radius[r].state));
                        break;
                }
        } while (0);
                        break;
                }
        } while (0);
@@ -671,10 +661,10 @@ void radiusretry(uint16_t r)
        sessionidt s = radius[r].session;
        tunnelidt t = 0;
 
        sessionidt s = radius[r].session;
        tunnelidt t = 0;
 
-       CSTAT(call_radiusretry);
+       CSTAT(radiusretry);
+
+       if (s) t = session[s].tunnel;
 
 
-       if (s)
-               t = session[s].tunnel;
        radius[r].retry = backoff(radius[r].try + 1);
        switch (radius[r].state)
        {
        radius[r].retry = backoff(radius[r].try + 1);
        switch (radius[r].state)
        {
for cloning use: "git clone git://git.sameswireless.fr/l2tpns.git" ; For add to your sources.list: "deb http://package.sameswifi.fr/ jessie main"