set MTU on tunnel interface so the kernel will re-fragment large packets to within MRU

[l2tpns.git] / radius.c

diff --git a/radius.c b/radius.c
index 9c8d444..a2b2339 100644 (file)
--- a/radius.c
+++ b/radius.c
@@ -1,6 +1,6 @@
 // L2TPNS Radius Stuff
 
-char const *cvs_id_radius = "$Id: radius.c,v 1.38 2005/07/31 10:35:39 bodea Exp $";
+char const *cvs_id_radius = "$Id: radius.c,v 1.45 2005/10/19 03:09:30 bodea Exp $";
 
 #include <time.h>
 #include <stdio.h>
@@ -13,7 +13,7 @@ char const *cvs_id_radius = "$Id: radius.c,v 1.38 2005/07/31 10:35:39 bodea Exp
 #include <ctype.h>
 #include <netinet/in.h>
 #include <errno.h>
-#include <openssl/md5.h>
+#include "md5.h"
 #include "constants.h"
 #include "l2tpns.h"
 #include "plugin.h"
@@ -27,6 +27,20 @@ extern configt *config;
 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)
 {
@@ -290,18 +304,11 @@ void radiussend(uint16_t r, uint8_t state)
                                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];
+                               {
+                                       struct param_radius_account acct = { &tunnel[session[s].tunnel], &session[s], &p };
+                                       run_plugins(PLUGIN_RADIUS_ACCOUNT, &acct);
+                               }
                        }
                }
        }
@@ -319,6 +326,30 @@ void radiussend(uint16_t r, uint8_t state)
                *(uint32_t *) (p + 2) = htonl(session[s].ip);
                p += p[1];
        }
+       if (s && session[s].route[0].ip)
+       {
+               int r;
+               for (r = 0; s && r < MAXROUTE && session[s].route[r].ip; r++)
+               {
+                       int width = 32;
+                       if (session[s].route[r].mask)
+                       {
+                           int mask = session[s].route[r].mask;
+                           while (!(mask & 1))
+                           {
+                               width--;
+                               mask >>= 1;
+                           }
+                       }
+
+                       *p = 22;        // Framed-Route
+                       p[1] = sprintf((char *) p + 2, "%s/%d %s 1",
+                               fmtaddr(htonl(session[s].route[r].ip), 0),
+                               width, fmtaddr(htonl(session[s].ip), 1)) + 2;
+
+                       p += p[1];
+               }
+       }
        if (*session[s].called)
        {
                *p = 30;                // called
@@ -326,7 +357,7 @@ void radiussend(uint16_t r, uint8_t state)
                strcpy((char *) p + 2, session[s].called);
                p += p[1];
        }
-       else if (*session[s].calling)
+       if (*session[s].calling)
        {
                *p = 31;                // calling
                p[1] = strlen(session[s].calling) + 2;
@@ -343,18 +374,9 @@ void radiussend(uint16_t r, uint8_t state)
        *(uint16_t *) (b + 2) = htons(p - b);
        if (state != RADIUSAUTH)
        {
-           // Build auth for accounting packet
-           uint8_t z[16] = {0};
-           uint8_t hash[16] = {0};
-           MD5_CTX 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);
+               // 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;
@@ -414,8 +436,7 @@ static void handle_avpair(sessionidt s, uint8_t *avp, int len)
 // 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;
@@ -454,12 +475,7 @@ void processrad(uint8_t *buf, int len, char socket_index)
                return;
        }
        t = session[s].tunnel;
-       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);
+       calc_auth(buf, len, radius[r].auth, hash);
        do {
                if (memcmp(hash, buf + 4, 16))
                {
@@ -493,7 +509,7 @@ void processrad(uint8_t *buf, int len, char socket_index)
                        if (radius[r].chap)
                        {
                                // CHAP
-                               uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPCHAP);
+                               uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP);
                                if (!p) return; // Abort!
 
                                *p = (r_code == AccessAccept) ? 3 : 4;     // ack/nak
@@ -507,7 +523,7 @@ void processrad(uint8_t *buf, int len, char socket_index)
                        else
                        {
                                // PAP
-                               uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP);
+                               uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP);
                                if (!p) return;         // Abort!
 
                                // ack/nak
@@ -712,7 +728,7 @@ void processrad(uint8_t *buf, int len, char socket_index)
 
                        // Valid Session, set it up
                        session[s].unique_id = 0;
-                       sessionsetup(t, s);
+                       sessionsetup(s, t);
                }
                else
                {
@@ -739,7 +755,7 @@ void radiusretry(uint16_t r)
        switch (radius[r].state)
        {
                case RADIUSCHAP:        // sending CHAP down PPP
-                       sendchap(t, s);
+                       sendchap(s, t);
                        break;
                case RADIUSAUTH:        // sending auth to RADIUS server
                case RADIUSSTART:       // sending start accounting to RADIUS server
@@ -762,8 +778,8 @@ extern int daefd;
 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen)
 {
        int i, r_code, r_id, length, attribute_length;
-       uint8_t vector[16], hash[16], *packet, attribute;
-       MD5_CTX ctx;
+       uint8_t *packet, attribute;
+       hasht hash;
        char username[MAXUSER] = "";
        in_addr_t nas = 0;
        in_addr_t ip = 0;
@@ -808,17 +824,8 @@ void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen)
        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)
+       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;
@@ -1024,10 +1031,9 @@ void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen)
        packet = buf;
        *packet++ = r_code;
        *packet++ = r_id;
-       packet += 2;
-       memset(packet, 0, 16);
-       packet += 16;
-       len = 20;
+       // skip len + auth
+       packet += 2 + 16;
+       len = packet - buf;
 
        // add attributes
        if (error)
@@ -1042,14 +1048,7 @@ void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen)
        *((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);
+       calc_auth(buf, len, hash, buf + 4);
 
        LOG(3, 0, 0, "Sending DAE %s, id=%d\n", radius_code(r_code), r_id);