// L2TPNS Radius Stuff
-// $Id: radius.c,v 1.1 2003-12-16 07:07:39 fred_nerk Exp $
+
+char const *cvs_id_radius = "$Id: radius.c,v 1.10 2004-09-02 04:18:07 fred_nerk 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 "plugin.h"
#include "util.h"
-extern char *radiussecret;
extern radiust *radius;
extern sessiont *session;
extern tunnelt *tunnel;
-extern ipt radiusserver[MAXRADSERVER]; // radius servers
extern u32 sessionid;
-extern u8 radiusfree;
-extern int radfd;
-extern u8 numradiusservers;
-extern char debug;
-extern unsigned long default_dns1, default_dns2;
-extern struct Tstats *_statistics;
-extern int radius_accounting;
-extern uint32_t bind_address;
+extern struct configt *config;
+extern int *radfds;
const char *radius_state(int state)
{
// Set up socket for radius requests
void initrad(void)
{
- radfd = socket(AF_INET, SOCK_DGRAM, UDP);
+ int i;
+ log(3, 0, 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++)
+ {
+ int flags;
+ if (!radfds[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);
+ }
}
-void radiusclear(u8 r, sessionidt s)
+void radiusclear(u16 r, sessionidt s)
{
- radius[r].state = RADIUSNULL;
if (s) session[s].radius = 0;
- memset(&radius[r], 0, sizeof(radius[r]));
- radius[r].next = radiusfree;
- radiusfree = r;
+ memset(&radius[r], 0, sizeof(radius[r])); // radius[r].state = RADIUSNULL;
+}
+
+
+static u16 get_free_radius()
+{
+ int count;
+ static u32 next_radius_id = 0;
+
+ for (count = MAXRADIUS; count > 0 ; --count)
+ {
+ ++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 is very bad!\n");
+ return 0;
}
-u8 radiusnew(sessionidt s)
+u16 radiusnew(sessionidt s)
{
- u8 r;
- if (!radiusfree)
+ u16 r = session[s].radius;
+
+ /* re-use */
+ if (r)
+ {
+ log(3, 0, 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");
STAT(radius_overflow);
return 0;
};
- r = radiusfree;
- session[s].radius = r;
- radiusfree = radius[r].next;
+
memset(&radius[r], 0, sizeof(radius[r]));
+ session[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.
+
+ log(3,0,s, session[s].tunnel, "Allocated radius %d\n", r);
return r;
}
// Send a RADIUS request
-void radiussend(u8 r, u8 state)
+void radiussend(u16 r, u8 state)
{
struct sockaddr_in addr;
u8 b[4096]; // RADIUS packet
int pl;
u8 *p;
sessionidt s;
-#ifdef STAT_CALLS
- STAT(call_radiussend);
-#endif
- if (!numradiusservers)
+
+ CSTAT(call_radiussend);
+
+ s = radius[r].session;
+ if (!config->numradiusservers)
{
- log(0, 0, 0, 0, "No RADIUS servers\n");
+ log(0, 0, s, session[s].tunnel, "No RADIUS servers\n");
return;
}
- if (!radiussecret)
+ if (!*config->radiussecret)
{
- log(0, 0, 0, 0, "No RADIUS secret\n");
+ log(0, 0, s, session[s].tunnel, "No RADIUS secret\n");
return;
}
- s = radius[r].session;
- if (state != RADIUSAUTH && !radius_accounting)
+ if (state != RADIUSAUTH && !config->radius_accounting)
{
// Radius accounting is turned off
radiusclear(r, s);
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);
- if (radius[r].try > numradiusservers * 2)
+ 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);
+ if (radius[r].try > config->numradiusservers * 2)
{
if (s)
{
- sessionshutdown(s, "RADIUS timeout");
+ if (state == RADIUSAUTH)
+ sessionshutdown(s, "RADIUS timeout");
+ else
+ {
+ log(1, 0, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n",
+ radius_states[state]);
+ radiusclear(r, s);
+ }
STAT(radius_timeout);
}
else
// 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] = 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);
}
- b[1] = r; // identifier
+ b[1] = r >> RADIUS_SHIFT; // identifier
memcpy(b + 4, radius[r].auth, 16);
p = b + 20;
if (s)
{
MD5_CTX ctx;
MD5Init(&ctx);
- MD5Update(&ctx, radiussecret, strlen(radiussecret));
+ MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret));
if (p)
MD5Update(&ctx, pass + p - 16, 16);
else
// NAS-IP-Address
*p = 4;
p[1] = 6;
- *(u32 *)(p + 2) = bind_address;
+ *(u32 *)(p + 2) = config->bind_address;
p += p[1];
// All AVpairs added
MD5Update(&ctx, b, 4);
MD5Update(&ctx, z, 16);
MD5Update(&ctx, b + 20, (p - b) - 20);
- MD5Update(&ctx, radiussecret, strlen(radiussecret));
+ MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret));
MD5Final(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 = htonl(radiusserver[(radius[r].try - 1) % numradiusservers]);
- addr.sin_port = htons((state == RADIUSAUTH) ? RADPORT : RADAPORT);
+ *(u32 *) & addr.sin_addr = config->radiusserver[(radius[r].try - 1) % config->numradiusservers];
+ {
+ // get radius port
+ u16 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
+ addr.sin_port = htons((state == RADIUSAUTH) ? port : port+1);
+ }
log_hex(5, "RADIUS Send", b, (p - b));
- sendto(radfd, b, p - b, 0, (void *) &addr, sizeof(addr));
+ sendto(radfds[r & RADIUS_MASK], b, p - b, 0, (void *) &addr, sizeof(addr));
}
// process RADIUS response
-void processrad(u8 * buf, int len)
+void processrad(u8 *buf, int len, char socket_index)
{
u8 b[MAXCONTROL];
MD5_CTX ctx;
- u8 r;
+ u16 r;
sessionidt s;
tunnelidt t = 0;
hasht hash;
u8 routes = 0;
-#ifdef STAT_CALLS
- STAT(call_processrad);
-#endif
+ 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);
+
log_hex(5, "RADIUS Response", buf, len);
if (len < 20 || len < ntohs(*(u16 *) (buf + 2)))
{
return ;
}
len = ntohs(*(u16 *) (buf + 2));
- r = buf[1];
+ 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, 0, 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)
{
log(1, 0, s, session[s].tunnel, " Unexpected RADIUS response\n");
MD5Update(&ctx, buf, 4);
MD5Update(&ctx, radius[r].auth, 16);
MD5Update(&ctx, buf + 20, len - 20);
- MD5Update(&ctx, radiussecret, strlen(radiussecret));
+ MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret));
MD5Final(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, 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))
{
log(1, 0, s, session[s].tunnel, " Unexpected RADIUS response %d\n", *buf);
- radius[r].state = RADIUSWAIT;
- break;
+ 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].chap)
{
// CHAP
- u8 *p = makeppp(b, 0, 0, t, s, PPPCHAP);
-
+ u8 *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);
else
{
// PAP
- u8 *p = makeppp(b, 0, 0, t, s, PPPPAP);
+ u8 *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 };
// 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));
+ session[s].ip_pool_index = -1;
}
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))));
+ log(3, 0, s, session[s].tunnel, " Radius reply contains primary DNS address %s\n", inet_toa(*(u32 *) (p + 2)));
session[s].dns1 = ntohl(*(u32 *) (p + 2));
}
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))));
+ log(3, 0, s, session[s].tunnel, " Radius reply contains secondary DNS address %s\n", inet_toa(*(u32 *) (p + 2)));
session[s].dns2 = ntohl(*(u32 *) (p + 2));
}
else if (*p == 22)
{
log(1, 0, 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));
+ 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);
session[s].route[routes].ip = ip;
session[s].route[routes].mask = mask;
routes++;
else if (*buf == 3)
{
log(2, 0, s, session[s].tunnel, " Authentication denied for %s\n", session[s].user);
+//FIXME: We should tear down the session here!
break;
}
- // Check for Assign-IP-Address
- if (!session[s].ip || session[s].ip == 0xFFFFFFFE)
+ if (!session[s].dns1 && config->default_dns1)
{
- session[s].ip = assign_ip_address();
- 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");
+ session[s].dns1 = htonl(config->default_dns1);
+ log(3, 0, s, t, " Sending dns1 = %s\n", inet_toa(config->default_dns1));
}
- if (!session[s].dns1 && default_dns1)
+ if (!session[s].dns2 && config->default_dns2)
{
- session[s].dns1 = htonl(default_dns1);
- log(3, 0, s, t, " Sending dns1 = %s\n", inet_toa(default_dns1));
- }
- if (!session[s].dns2 && default_dns2)
- {
- session[s].dns2 = htonl(default_dns2);
- log(3, 0, s, t, " Sending dns2 = %s\n", inet_toa(default_dns2));
+ session[s].dns2 = htonl(config->default_dns2);
+ log(3, 0, s, t, " Sending dns2 = %s\n", inet_toa(config->default_dns2));
}
- 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, 0, s, t, " RADIUS accounting ack recv in state %s\n", radius_states[radius[r].state]);
+ break;
}
} while (0);
}
// Send a retry for RADIUS/CHAP message
-void radiusretry(u8 r)
+void radiusretry(u16 r)
{
sessionidt s = radius[r].session;
tunnelidt t = 0;
-#ifdef STAT_CALLS
- STAT(call_radiusretry);
-#endif
+
+ CSTAT(call_radiusretry);
+
if (s)
t = session[s].tunnel;
- radius[r].retry = 0;
+ radius[r].retry = backoff(radius[r].try + 1);
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 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;
}
}
+void radius_clean()
+{
+ int i;
+
+ log(1, 0, 0, 0, "Cleaning radius session array\n");
+
+ for (i = 1; i < MAXRADIUS; i++)
+ {
+ if (radius[i].retry == 0
+ || !session[radius[i].session].opened
+ || session[radius[i].session].die
+ || session[radius[i].session].tunnel == 0)
+ radiusclear(i, radius[i].session);
+ }
+}
projects / l2tpns.git / blobdiff