// L2TPNS Radius Stuff
-char const *cvs_id_radius = "$Id: radius.c,v 1.37 2005/07/31 10:04:10 bodea Exp $";
-
#include <time.h>
#include <stdio.h>
#include <sys/types.h>
#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"
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)
{
int i;
+ uint16_t port = 0;
+ uint16_t min = config->radius_bind_min;
+ uint16_t max = config->radius_bind_max;
+ int inc = 1;
+ struct sockaddr_in addr;
+
+ if (min)
+ {
+ port = min;
+ if (!max)
+ max = ~0 - 1;
+ }
+ else if (max) /* no minimum specified, bind from max down */
+ {
+ port = max;
+ min = 1;
+ inc = -1;
+ }
+
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++)
radfds[i] = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
flags = fcntl(radfds[i], F_GETFL, 0);
fcntl(radfds[i], F_SETFL, flags | O_NONBLOCK);
+
+ if (port)
+ {
+ int b;
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_addr.s_addr = INADDR_ANY;
+
+ do {
+ addr.sin_port = htons(port);
+ if ((b = bind(radfds[i], (struct sockaddr *) &addr, sizeof(addr))) < 0)
+ {
+ if ((port += inc) < min || port > max)
+ {
+ LOG(0, 0, 0, "Can't bind RADIUS socket in range %u-%u\n", min, max);
+ exit(1);
+ }
+ }
+ } while (b < 0);
+ }
}
}
return;
}
- if (state != RADIUSAUTH && !config->radius_accounting)
+ if (state != RADIUSAUTH && state != RADIUSJUSTAUTH && !config->radius_accounting)
{
// Radius accounting is turned off
radiusclear(r, s);
{
if (s)
{
- if (state == RADIUSAUTH)
- sessionshutdown(s, "RADIUS timeout.", 3, 0);
+ if (state == RADIUSAUTH || state == RADIUSJUSTAUTH)
+ sessionshutdown(s, "RADIUS timeout.", CDN_ADMIN_DISC, TERM_REAUTHENTICATION_FAILURE);
else
{
LOG(1, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n",
switch (state)
{
case RADIUSAUTH:
+ case RADIUSJUSTAUTH:
b[0] = AccessRequest; // access request
break;
case RADIUSSTART:
strcpy((char *) p + 2, session[s].user);
p += p[1];
}
- if (state == RADIUSAUTH)
+ if (state == RADIUSAUTH || state == RADIUSJUSTAUTH)
{
if (radius[r].chap)
{
p += p[1];
}
}
- else if (state == RADIUSSTART || state == RADIUSSTOP || state == RADIUSINTERIM)
- { // accounting
+ else // accounting
+ {
*p = 40; // accounting type
p[1] = 6;
*(uint32_t *) (p + 2) = htonl(state - RADIUSSTART + 1); // start=1, stop=2, interim=3
p[1] = 6;
*(uint32_t *) (p + 2) = htonl(session[s].cout);
p += p[1];
- if (state == RADIUSSTOP)
- {
- *p = 46; // session time
- p[1] = 6;
- *(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
- p += p[1];
- }
+
+ *p = 46; // session time
+ p[1] = 6;
+ *(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
+ p += p[1];
*p = 47; // input packets
p[1] = 6;
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);
+ if (state == RADIUSSTOP && radius[r].term_cause)
+ {
+ *p = 49; // acct-terminate-cause
+ p[1] = 6;
+ *(uint32_t *) (p + 2) = htonl(radius[r].term_cause);
+ p += p[1];
+
+ if (radius[r].term_msg)
+ {
+ *p = 26; // vendor-specific
+ *(uint32_t *) (p + 2) = htonl(9); // Cisco
+ p[6] = 1; // Cisco-AVPair
+ p[7] = 2 + sprintf((char *) p + 8, "disc-cause-ext=%s", radius[r].term_msg);
+ p[1] = p[7] + 6;
+ p += p[1];
+ }
+ }
+ }
- p[1] = p[7] + 6;
+ if (session[s].classlen) {
+ *p = 25; // class
+ p[1] = session[s].classlen + 2;
+ memcpy(p + 2, session[s].class, session[s].classlen);
p += p[1];
}
+
+ {
+ struct param_radius_account acct = { &tunnel[session[s].tunnel], &session[s], &p };
+ run_plugins(PLUGIN_RADIUS_ACCOUNT, &acct);
+ }
}
}
+
if (s)
{
- *p = 5; // NAS-Port
+ *p = 5; // NAS-Port
p[1] = 6;
*(uint32_t *) (p + 2) = htonl(s);
p += p[1];
- }
- if (s && session[s].ip)
- {
- *p = 8; // Framed-IP-Address
+
+ *p = 6; // Service-Type
p[1] = 6;
- *(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((char *) p + 2, session[s].called);
+ *(uint32_t *) (p + 2) = htonl((state == RADIUSJUSTAUTH ? 8 : 2)); // Authenticate only or Framed-User respectevily
p += p[1];
- }
- else if (*session[s].calling)
- {
- *p = 31; // calling
- p[1] = strlen(session[s].calling) + 2;
- strcpy((char *) p + 2, session[s].calling);
+
+ *p = 7; // Framed-Protocol
+ p[1] = htonl((state == RADIUSJUSTAUTH ? 0 : 6));
+ *(uint32_t *) (p + 2) = htonl((state == RADIUSJUSTAUTH ? 0 : 1)); // PPP
p += p[1];
+
+ if (session[s].ip)
+ {
+ *p = 8; // Framed-IP-Address
+ p[1] = 6;
+ *(uint32_t *) (p + 2) = htonl(session[s].ip);
+ p += p[1];
+ }
+
+ if (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].session_timeout)
+ {
+ *p = 27; // Session-Timeout
+ p[1] = 6;
+ *(uint32_t *) (p + 2) = htonl(session[s].session_timeout);
+ p += p[1];
+ }
+
+ if (session[s].idle_timeout)
+ {
+ *p = 28; // Idle-Timeout
+ p[1] = 6;
+ *(uint32_t *) (p + 2) = htonl(session[s].idle_timeout);
+ p += p[1];
+ }
+
+ if (*session[s].called)
+ {
+ *p = 30; // called
+ p[1] = strlen(session[s].called) + 2;
+ strcpy((char *) p + 2, session[s].called);
+ p += p[1];
+ }
+
+ if (*session[s].calling)
+ {
+ *p = 31; // calling
+ p[1] = strlen(session[s].calling) + 2;
+ strcpy((char *) p + 2, session[s].calling);
+ p += p[1];
+ }
}
+
// NAS-IP-Address
*p = 4;
p[1] = 6;
// All AVpairs added
*(uint16_t *) (b + 2) = htons(p - b);
- if (state != RADIUSAUTH)
+ if (state != RADIUSAUTH && state != RADIUSJUSTAUTH)
{
- // 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;
// 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);
+ addr.sin_port = htons((state == RADIUSAUTH || state == RADIUSJUSTAUTH) ? port : port+1);
}
LOG_HEX(5, "RADIUS Send", b, (p - b));
// 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;
LOG(1, s, session[s].tunnel, " Unexpected RADIUS response\n");
return;
}
- if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSSTART
+ if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSJUSTAUTH && radius[r].state != RADIUSSTART
&& radius[r].state != RADIUSSTOP && radius[r].state != RADIUSINTERIM)
{
LOG(1, s, session[s].tunnel, " Unexpected RADIUS response\n");
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))
{
return; // Do nothing. On timeout, it will try the next radius server.
}
- if ((radius[r].state == RADIUSAUTH && r_code != AccessAccept && r_code != AccessReject) ||
+ if (((radius[r].state == RADIUSAUTH ||radius[r].state == RADIUSJUSTAUTH) && r_code != AccessAccept && r_code != AccessReject) ||
((radius[r].state == RADIUSSTART || radius[r].state == RADIUSSTOP || radius[r].state == RADIUSINTERIM) && r_code != AccountingResponse))
{
LOG(1, s, session[s].tunnel, " Unexpected RADIUS response %s\n", radius_code(r_code));
// care off finishing the radius session if that's really correct.
}
- if (radius[r].state == RADIUSAUTH)
+ if (radius[r].state == RADIUSAUTH || radius[r].state == RADIUSJUSTAUTH)
{
// run post-auth plugin
struct param_post_auth packet = {
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, 0, 0, 0);
if (!p) return; // Abort!
*p = (r_code == AccessAccept) ? 3 : 4; // ack/nak
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, 0, 0, 0);
if (!p) return; // Abort!
// ack/nak
uint8_t *e = buf + len;
for (; p + 2 <= e && p[1] && p + p[1] <= e; p += p[1])
{
+ if (*p == 26 && p[1] >= 7)
+ {
+ // Vendor-Specific Attribute
+ uint32_t vendor = ntohl(*(int *)(p + 2));
+ uint8_t attrib = *(p + 6);
+ int attrib_length = *(p + 7) - 2;
+
+ LOG(4, s, session[s].tunnel, " Radius reply contains Vendor-Specific. Vendor=%u Attrib=%u Length=%d\n", vendor, attrib, attrib_length);
+ if (vendor == 9 && attrib == 1) // Cisco-AVPair
+ {
+ if (attrib_length < 0) continue;
+ LOG(3, s, session[s].tunnel, " Cisco-AVPair value: %.*s\n",
+ attrib_length, p + 8);
+
+ handle_avpair(s, p + 8, attrib_length);
+ continue;
+ }
+ else if (vendor == 529 && attrib >= 135 && attrib <= 136) // Ascend
+ {
+ // handle old-format ascend DNS attributes below
+ p += 6;
+ }
+ else
+ {
+ LOG(3, s, session[s].tunnel, " Unknown vendor-specific\n");
+ continue;
+ }
+ }
+
if (*p == 8)
{
// Framed-IP-Address
ip_filters[f].used++;
}
}
- else if (*p == 26 && p[1] >= 7)
+ else if (*p == 27)
{
- // Vendor-Specific Attribute
- int vendor = ntohl(*(int *)(p + 2));
- char attrib = *(p + 6);
- 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)
- {
- 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);
- }
+ // Session-Timeout
+ if (p[1] < 6) continue;
+ session[s].session_timeout = ntohl(*(uint32_t *)(p + 2));
+ LOG(3, s, session[s].tunnel, " Radius reply contains Session-Timeout = %u\n", session[s].session_timeout);
+ if(!session[s].session_timeout && config->kill_timedout_sessions)
+ sessionshutdown(s, "Session timeout is zero", CDN_ADMIN_DISC, 0);
+ }
+ else if (*p == 28)
+ {
+ // Idle-Timeout
+ if (p[1] < 6) continue;
+ session[s].idle_timeout = ntohl(*(uint32_t *)(p + 2));
+ LOG(3, s, session[s].tunnel, " Radius reply contains Idle-Timeout = %u\n", session[s].idle_timeout);
}
else if (*p == 99)
{
session[s].ipv6prefixlen = prefixlen;
}
}
+ else if (*p == 25)
+ {
+ // Class
+ if (p[1] < 3) continue;
+ session[s].classlen = p[1] - 2;
+ if (session[s].classlen > MAXCLASS)
+ session[s].classlen = MAXCLASS;
+ memcpy(session[s].class, p + 2, session[s].classlen);
+ }
}
}
else if (r_code == AccessReject)
// Valid Session, set it up
session[s].unique_id = 0;
- sessionsetup(t, s);
+ sessionsetup(s, t);
}
else
{
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 RADIUSJUSTAUTH: // 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
extern int daefd;
-void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen)
+void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
{
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;
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;
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
+ sessionshutdown(s, "Requested by PoD", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // disconnect session
break;
case CoARequest: // Change of Authorization
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)
*((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);
// send DAE response
- if (sendto(daefd, buf, len, MSG_DONTWAIT | MSG_NOSIGNAL, (struct sockaddr *) addr, alen) < 0)
+ if (sendtofrom(daefd, buf, len, MSG_DONTWAIT | MSG_NOSIGNAL, (struct sockaddr *) addr, alen, local) < 0)
LOG(0, 0, 0, "Error sending DAE response packet: %s\n", strerror(errno));
}
projects / l2tpns.git / blobdiff