more paranoid length checking for RADIUS replies

[l2tpns.git] / radius.c

diff --git a/radius.c b/radius.c
index 33f8bcb..735ae07 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 1.14 2004/11/27 05:19:53 bodea Exp $";
+char const *cvs_id_radius = "$Id: radius.c,v 1.19 2004/11/30 06:50:26 bodea Exp $";

 
 #include <time.h>
 #include <stdio.h>
 
 #include <time.h>
 #include <stdio.h>


@@ -24,6 +24,7 @@ extern tunnelt *tunnel;
 extern u32 sessionid;
 extern configt *config;
 extern int *radfds;
 extern u32 sessionid;
 extern configt *config;
 extern int *radfds;

+extern ip_filtert *ip_filters;

 
 static const char *radius_state(int state)
 {
 
 static const char *radius_state(int state)
 {


@@ -41,7 +42,7 @@ static const char *radius_state(int state)
 void initrad(void)
 {
        int i;
 void initrad(void)
 {
        int i;

-       LOG(3, 0, 0, 0, "Creating %d sockets for RADIUS queries\n", config->num_radfds);
+       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++)
        {
        radfds = calloc(sizeof(int), config->num_radfds);
        for (i = 0; i < config->num_radfds; i++)
        {


@@ -76,7 +77,7 @@ static u16 get_free_radius()
                }
        }
 
                }
        }
 

-       LOG(0, 0, 0, 0, "Can't find a free radius session! This is very bad!\n");
+       LOG(0, 0, 0, "Can't find a free radius session! This is very bad!\n");

        return 0;
 }
 
        return 0;
 }
 


@@ -87,13 +88,13 @@ u16 radiusnew(sessionidt s)
        /* re-use */
        if (r)
        {
        /* re-use */
        if (r)
        {

-               LOG(3, 0, s, session[s].tunnel, "Re-used radius %d\n", r);
+               LOG(3, s, session[s].tunnel, "Re-used radius %d\n", r);

                return r;
        }
 
        if (!(r = get_free_radius()))
        {
                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;
        };
                STAT(radius_overflow);
                return 0;
        };


@@ -104,7 +105,7 @@ u16 radiusnew(sessionidt s)
        radius[r].state = RADIUSWAIT;
        radius[r].retry = TIME + 1200; // Wait at least 120 seconds to re-claim this.
 
        radius[r].state = RADIUSWAIT;
        radius[r].retry = TIME + 1200; // Wait at least 120 seconds to re-claim this.
 

-       LOG(3,0,s, session[s].tunnel, "Allocated radius %d\n", r);
+       LOG(3, s, session[s].tunnel, "Allocated radius %d\n", r);

        return r;
 }
 
        return r;
 }
 


@@ -123,12 +124,12 @@ void radiussend(u16 r, u8 state)
        s = radius[r].session;
        if (!config->numradiusservers)
        {
        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)
        {
                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;
        }
 
                return;
        }
 


@@ -143,9 +144,10 @@ void radiussend(u16 r, u8 state)
                radius[r].try = 0;
        radius[r].state = state;
        radius[r].retry = backoff(radius[r].try++);
                radius[r].try = 0;
        radius[r].state = state;
        radius[r].retry = backoff(radius[r].try++);

-       LOG(4, 0, 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);
+       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)
        if (radius[r].try > config->numradiusservers * 2)
        {
                if (s)


@@ -154,7 +156,7 @@ void radiussend(u16 r, u8 state)
                                sessionshutdown(s, "RADIUS timeout");
                        else
                        {
                                sessionshutdown(s, "RADIUS timeout");
                        else
                        {

-                               LOG(1, 0, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n",
+                               LOG(1, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n",

                                        radius_states[state]);
                                radiusclear(r, s);
                        }
                                        radius_states[state]);
                                radiusclear(r, s);
                        }


@@ -179,7 +181,7 @@ void radiussend(u16 r, u8 state)
                        b[0] = 4;               // accounting request
                        break;
                default:
                        b[0] = 4;               // accounting request
                        break;
                default:

-                       LOG(0, 0, 0, 0, "Unknown radius state %d\n", state);
+                       LOG(0, 0, 0, "Unknown radius state %d\n", state);

        }
        b[1] = r >> RADIUS_SHIFT;       // identifier
        memcpy(b + 4, radius[r].auth, 16);
        }
        b[1] = r >> RADIUS_SHIFT;       // identifier
        memcpy(b + 4, radius[r].auth, 16);


@@ -380,22 +382,22 @@ void processrad(u8 *buf, int len, char socket_index)
        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(*(u16 *) (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 = socket_index | (r_id << RADIUS_SHIFT);
        s = radius[r].session;
                return ;
        }
        len = ntohs(*(u16 *) (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 (code %d, id %d)\n",
+       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);
        if (!s && radius[r].state != RADIUSSTOP)
        {
                        radius_states[radius[r].state], r, s, 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)
        {
                return;
        }
        if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSSTART && 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;
        }
        t = session[s].tunnel;
                return;
        }
        t = session[s].tunnel;


@@ -408,19 +410,19 @@ void processrad(u8 *buf, int len, char socket_index)
        do {
                if (memcmp(hash, buf + 4, 16))
                {
        do {
                if (memcmp(hash, buf + 4, 16))
                {

-                       LOG(0, 0, s, session[s].tunnel, "   Incorrect auth on RADIUS response!! (wrong secret in radius config?)\n");
+                       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))
                {
                        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))
                {

-                       LOG(1, 0, s, session[s].tunnel, "   Unexpected RADIUS response %d\n", *buf);
+                       LOG(1, s, session[s].tunnel, "   Unexpected RADIUS response %d\n", *buf);

                        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)
                {
                        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");
+                       LOG(4, s, session[s].tunnel, "   Original response is \"%s\"\n", (*buf == 2) ? "accept" : "reject");

                        // process auth response
                        if (radius[r].chap)
                        {
                        // process auth response
                        if (radius[r].chap)
                        {


@@ -434,7 +436,7 @@ void processrad(u8 *buf, int len, char socket_index)
                                        *buf = packet.auth_allowed ? 2 : 3;
                                }
 
                                        *buf = packet.auth_allowed ? 2 : 3;
                                }
 

-                               LOG(3, 0, s, session[s].tunnel, "   CHAP User %s authentication %s.\n", session[s].user,
+                               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[1] = radius[r].id;
                                                (*buf == 2) ? "allowed" : "denied");
                                *p = (*buf == 2) ? 3 : 4;     // ack/nak
                                p[1] = radius[r].id;


@@ -453,7 +455,7 @@ void processrad(u8 *buf, int len, char socket_index)
                                        *buf = packet.auth_allowed ? 2 : 3;
                                }
 
                                        *buf = packet.auth_allowed ? 2 : 3;
                                }
 

-                               LOG(3, 0, s, session[s].tunnel, "   PAP User %s authentication %s.\n", session[s].user,
+                               LOG(3, s, session[s].tunnel, "   PAP User %s authentication %s.\n", session[s].user,

                                                (*buf == 2) ? "allowed" : "denied");
                                // ack/nak
                                *p = *buf;
                                                (*buf == 2) ? "allowed" : "denied");
                                // ack/nak
                                *p = *buf;


@@ -469,30 +471,36 @@ void processrad(u8 *buf, int len, char socket_index)
                                // Extract IP, routes, etc
                                u8 *p = buf + 20;
                                u8 *e = buf + len;
                                // Extract IP, routes, etc
                                u8 *p = buf + 20;
                                u8 *e = buf + len;

-                               for (p = buf + 20; p < e && p[1]; p += p[1])
+                               for (; p + 2 <= e && p[1] && p + p[1] <= e; p += p[1])

                                {
                                        if (*p == 8)
                                        {
                                {
                                        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)));
+                                               // Framed-IP-Address
+                                               if (p[1] < 6) continue;

                                                session[s].ip = ntohl(*(u32 *) (p + 2));
                                                session[s].ip_pool_index = -1;
                                                session[s].ip = ntohl(*(u32 *) (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));

                                        }
                                        else if (*p == 135)
                                        {
                                                // DNS address
                                        }
                                        else if (*p == 135)
                                        {
                                                // DNS address

-                                               LOG(3, 0, s, session[s].tunnel, "   Radius reply contains primary DNS address %s\n", inet_toa(*(u32 *) (p + 2)));
+                                               if (p[1] < 6) continue;

                                                session[s].dns1 = ntohl(*(u32 *) (p + 2));
                                                session[s].dns1 = ntohl(*(u32 *) (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
                                        }
                                        else if (*p == 136)
                                        {
                                                // DNS address

-                                               LOG(3, 0, s, session[s].tunnel, "   Radius reply contains secondary DNS address %s\n", inet_toa(*(u32 *) (p + 2)));
+                                               if (p[1] < 6) continue;

                                                session[s].dns2 = ntohl(*(u32 *) (p + 2));
                                                session[s].dns2 = ntohl(*(u32 *) (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)
                                        {
                                        }
                                        else if (*p == 22)
                                        {

-                                               // framed-route
+                                               // Framed-Route

                                                ipt ip = 0, mask = 0;
                                                u8 u = 0;
                                                u8 bits = 0;
                                                ipt ip = 0, mask = 0;
                                                u8 u = 0;
                                                u8 bits = 0;


@@ -523,71 +531,110 @@ void processrad(u8 *buf, int len, char socket_index)
                                                        mask = 0xFFFF0000;
                                                else
                                                        mask = 0xFFFFFF00;
                                                        mask = 0xFFFF0000;
                                                else
                                                        mask = 0xFFFFFF00;

+

                                                if (routes == MAXROUTE)
                                                {
                                                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 if (ip)
                                                {
                                                }
                                                else if (ip)
                                                {

-                                                       char *ips, *masks;
-                                                       ips = strdup(inet_toa(htonl(ip)));
-                                                       masks = strdup(inet_toa(htonl(mask)));
-                                                       LOG(3, 0, s, session[s].tunnel, "   Radius reply contains route for %s/%s\n", ips, masks);
-                                                       free(ips);
-                                                       free(masks);
+                                                       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++;
                                                }
                                        }
                                                        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 = p + 2;
+                                               int l = p[1] - 2;
+                                               char *suffix;
+                                               u8 *f = 0;
+                                               int i;
+
+                                               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;
+                                                       else if (l - b == 4 && !memcmp("out", suffix+1, 3))
+                                                               f = &session[s].filter_out;
+
+                                                       l = b;
+                                               }
+
+                                               if (!f)
+                                               {
+                                                       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
+                                                       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);
                                                char attrib_length = *(p + 7) - 2;
                                        {
                                                // 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
+                                               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)

                                                {
                                                {

-                                                       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) 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 (*buf == 3)
                        {
                                        }
                                }
                        }
                        else if (*buf == 3)
                        {

-                               LOG(2, 0, s, session[s].tunnel, "   Authentication denied for %s\n", session[s].user);
+                               LOG(2, s, session[s].tunnel, "   Authentication denied for %s\n", session[s].user);

 //FIXME: We should tear down the session here!
                                break;
                        }
 //FIXME: We should tear down the session here!
                                break;
                        }


@@ -595,12 +642,12 @@ void processrad(u8 *buf, int len, char socket_index)
                        if (!session[s].dns1 && config->default_dns1)
                        {
                                session[s].dns1 = htonl(config->default_dns1);
                        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));
+                               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);
                        }
                        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));
+                               LOG(3, s, t, "   Sending dns2 = %s\n", fmtaddr(config->default_dns2, 0));

                        }
 
                        // Valid Session, set it up
                        }
 
                        // Valid Session, set it up


@@ -610,7 +657,7 @@ void processrad(u8 *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, 0, 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_states[radius[r].state]);

                        break;
                }
        } while (0);
                        break;
                }
        } while (0);


@@ -652,7 +699,7 @@ void radiusretry(u16 r)
                case RADIUSWAIT:           // waiting timeout before available, in case delayed reply from RADIUS server
                        // free up RADIUS task
                        radiusclear(r, s);
                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);
+                       LOG(3, s, session[s].tunnel, "Freeing up radius session %d\n", r);

                        break;
        }
 }
                        break;
        }
 }