// L2TPNS Radius Stuff
-char const *cvs_id_radius = "$Id: radius.c,v 1.33 2005/06/04 15:42:36 bodea Exp $";
+char const *cvs_id_radius = "$Id: radius.c,v 1.34 2005/06/28 14:48:28 bodea Exp $";
#include <time.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <netinet/in.h>
+#include <errno.h>
#include "md5.h"
#include "constants.h"
#include "l2tpns.h"
#include "plugin.h"
#include "util.h"
+#include "cluster.h"
extern radiust *radius;
extern sessiont *session;
int count;
static uint32_t next_radius_id = 0;
- for (count = MAXRADIUS; count > 0 ; --count)
+ for (count = MAXRADIUS; count > 0; --count)
{
++next_radius_id; // Find the next ID to check.
if (next_radius_id >= MAXRADIUS)
{
*p = 26; // vendor-specific
*(uint32_t *) (p + 2) = htonl(9); // Cisco
- p[6] = 1; // Cisco-Avpair
+ p[6] = 1; // Cisco-AVPair
p[7] = 2 + sprintf(p + 8, "intercept=%s:%d",
fmtaddr(session[s].snoop_ip, 0), session[s].snoop_port);
sendto(radfds[r & RADIUS_MASK], b, p - b, 0, (void *) &addr, sizeof(addr));
}
+static void handle_avpair(sessionidt s, uint8_t *avp, int len)
+{
+ char *key = avp;
+ char *value = memchr(avp, '=', len);
+ char tmp[2048] = "";
+
+ if (value)
+ {
+ *value++ = 0;
+ len -= value - key;
+ }
+ else
+ {
+ value = tmp;
+ len = 0;
+ }
+
+ // strip quotes
+ if (len > 2 && (*value == '"' || *value == '\'') && value[len - 1] == *value)
+ {
+ value++;
+ len--;
+ value[len - 1] = 0;
+ }
+ // copy and null terminate
+ else if (len < sizeof(tmp) - 1)
+ {
+ memcpy(tmp, value, len);
+ tmp[len] = 0;
+ value = tmp;
+ }
+ else
+ return;
+
+ // Run hooks
+ {
+ struct param_radius_response p = { &tunnel[session[s].tunnel], &session[s], key, value };
+ run_plugins(PLUGIN_RADIUS_RESPONSE, &p);
+ }
+}
+
// process RADIUS response
void processrad(uint8_t *buf, int len, char socket_index)
{
char *filter = p + 2;
int l = p[1] - 2;
char *suffix;
- uint8_t *f = 0;
- int i;
+ int f;
+ uint8_t *fp = 0;
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;
+ fp = &session[s].filter_in;
else if (l - b == 4 && !memcmp("out", suffix+1, 3))
- f = &session[s].filter_out;
+ fp = &session[s].filter_out;
l = b;
}
- if (!f)
+ if (!fp)
{
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
+ if ((f = find_filter(filter, l)) < 0 || !*ip_filters[f].name)
+ {
LOG(3, s, session[s].tunnel, " Unknown filter\n");
-
+ }
+ else
+ {
+ *fp = f + 1;
+ ip_filters[f].used++;
+ }
}
else if (*p == 26 && p[1] >= 7)
{
int vendor = ntohl(*(int *)(p + 2));
char attrib = *(p + 6);
int attrib_length = *(p + 7) - 2;
- 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)
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;
- }
+ if (attrib_length > 0)
+ {
+ LOG(3, s, session[s].tunnel, " Cisco-AVPair value: %.*s\n",
+ attrib_length, p + 8);
- // 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);
+ handle_avpair(s, p + 8, attrib_length);
+ }
}
else if (*p == 99)
{
break;
}
}
+
+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;
+ char username[MAXUSER] = "";
+ in_addr_t nas = 0;
+ in_addr_t ip = 0;
+ uint32_t port = 0;
+ uint32_t error = 0;
+ sessionidt s = 0;
+ tunnelidt t;
+ int fin = -1;
+ int fout = -1;
+ uint8_t *avpair[64];
+ int avpair_len[sizeof(avpair)/sizeof(*avpair)];
+ int avp = 0;
+ int auth_only = 0;
+ uint8_t *p;
+
+ LOG(3, 0, 0, "DAE request from %s\n", fmtaddr(addr->sin_addr.s_addr, 0));
+
+ // check if DAE is from RADIUS server
+ for (i = 0; i < config->numradiusservers; i++)
+ if (config->radiusserver[i] == addr -> sin_addr.s_addr)
+ break;
+
+ if (i >= config->numradiusservers)
+ {
+ LOG(1, 0, 0, "Unknown DAE client %s\n", fmtaddr(addr->sin_addr.s_addr, 0));
+ return;
+ }
+
+ LOG_HEX(5, "DAE Request", buf, len);
+
+ if (len < 20 || len < ntohs(*(uint16_t *) (buf + 2)))
+ {
+ LOG(1, 0, 0, "Duff DAE request length %d\n", len);
+ return;
+ }
+
+ r_code = buf[0]; // request type
+ r_id = buf[1]; // radius indentifier.
+
+ if (r_code != DisconnectRequest && r_code != CoARequest)
+ {
+ LOG(1, 0, 0, "Unrecognised DAE request %s\n", radius_code(r_code));
+ return;
+ }
+
+ if (!config->cluster_iam_master)
+ {
+ master_forward_dae_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
+ return;
+ }
+
+ len = ntohs(*(uint16_t *) (buf + 2));
+
+ 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;
+
+ MD5Init(&ctx);
+ MD5Update(&ctx, buf, len);
+ MD5Update(&ctx, buf, config->radiussecret, i);
+ MD5Final(hash, &ctx);
+ if (memcmp(hash, vector, 16) != 0)
+ {
+ LOG(1, 0, 0, "Incorrect vector in DAE request (wrong secret in radius config?)\n");
+ return;
+ }
+
+ // unpack attributes
+ packet = buf + 20;
+ length = len - 20;
+
+ while (length > 0)
+ {
+ attribute = *packet++;
+ attribute_length = *packet++;
+ if (attribute_length < 2)
+ break;
+
+ length -= attribute_length;
+ attribute_length -= 2;
+ switch (attribute)
+ {
+ case 1: /* username */
+ len = attribute_length < MAXUSER ? attribute_length : MAXUSER - 1;
+ memcpy(username, packet, len);
+ username[len] = 0;
+ LOG(4, 0, 0, " Received DAE User-Name: %s\n", username);
+ break;
+
+ case 4: /* nas ip address */
+ nas = *(uint32_t *) packet; // net order
+ if (nas != config->bind_address)
+ error = 403; // NAS identification mismatch
+
+ LOG(4, 0, 0, " Received DAE NAS-IP-Address: %s\n", fmtaddr(nas, 0));
+ break;
+
+ case 5: /* nas port */
+ port = ntohl(*(uint32_t *) packet);
+ if (port < 1 || port > MAXSESSION)
+ error = 404;
+
+ LOG(4, 0, 0, " Received DAE NAS-Port: %u\n", port);
+ break;
+
+ case 6: /* service type */
+ {
+ uint32_t service_type = ntohl(*(uint32_t *) packet);
+ auth_only = service_type == 8; // Authenticate only
+
+ LOG(4, 0, 0, " Received DAE Service-Type: %u\n", service_type);
+ }
+ break;
+
+ case 8: /* ip address */
+ ip = *(uint32_t *) packet; // net order
+ LOG(4, 0, 0, " Received DAE Framed-IP-Address: %s\n", fmtaddr(ip, 0));
+ break;
+
+ case 11: /* filter id */
+ LOG(4, 0, 0, " Received DAE Filter-Id: %.*s\n", attribute_length, packet);
+ if (!(p = memchr(packet, '.', attribute_length)))
+ {
+ error = 404; // invalid request
+ break;
+ }
+
+ len = p - packet;
+ i = find_filter(packet, len);
+ if (i < 0 || !*ip_filters[i].name)
+ {
+ error = 404;
+ break;
+ }
+
+ if (!memcmp(p, ".in", attribute_length - len))
+ fin = i + 1;
+ else if (!memcmp(p, ".out", attribute_length - len))
+ fout = i + 1;
+ else
+ error = 404;
+
+ break;
+
+ case 26: /* vendor specific */
+ if (attribute_length >= 6
+ && ntohl(*(uint32_t *) packet) == 9 // Cisco
+ && *(packet + 4) == 1 // Cisco-AVPair
+ && *(packet + 5) >= 2) // length
+ {
+ int len = *(packet + 5) - 2;
+ uint8_t *a = packet + 6;
+
+ LOG(4, 0, 0, " Received DAE Cisco-AVPair: %.*s\n", len, a);
+ if (avp < sizeof(avpair)/sizeof(*avpair) - 1)
+ {
+ avpair[avp] = a;
+ avpair_len[avp++] = len;
+ }
+ }
+ break;
+ }
+
+ packet += attribute_length;
+ }
+
+ if (!error && auth_only)
+ {
+ if (fin != -1 || fout != -1 || avp)
+ error = 401; // unsupported attribute
+ else
+ error = 405; // unsupported service
+ }
+
+ if (!error && !(port || ip || *username))
+ error = 402; // missing attribute
+
+ // exact match for SID if given
+ if (!error && port)
+ {
+ s = port;
+ if (!session[s].opened)
+ error = 503; // not found
+ }
+
+ if (!error && ip)
+ {
+ // find/check session by IP
+ i = sessionbyip(ip);
+ if (!i || (s && s != i)) // not found or mismatching port
+ error = 503;
+ else
+ s = i;
+ }
+
+ if (!error && *username)
+ {
+ if (s)
+ {
+ if (strcmp(session[s].user, username))
+ error = 503;
+ }
+ else if (!(s = sessionbyuser(username)))
+ error = 503;
+ }
+
+ t = session[s].tunnel;
+
+ switch (r_code)
+ {
+ case DisconnectRequest: // Packet of Disconnect/Death
+ if (error)
+ {
+ r_code = DisconnectNAK;
+ break;
+ }
+
+ 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
+ break;
+
+ case CoARequest: // Change of Authorization
+ if (error)
+ {
+ r_code = CoANAK;
+ break;
+ }
+
+ LOG(3, s, t, " DAE Change %d (%s)\n", s, session[s].user);
+ r_code = CoAACK;
+
+ // reset
+ {
+ struct param_radius_reset p = { &tunnel[session[s].tunnel], &session[s] };
+ run_plugins(PLUGIN_RADIUS_RESET, &p);
+ }
+
+ // apply filters
+ if (fin != -1 || fout != -1)
+ {
+ if (fin == -1)
+ fin = 0;
+ else
+ LOG(3, s, t, " Filter in %d (%s)\n", fin, ip_filters[fin - 1].name);
+
+ if (fout == -1)
+ fout = 0;
+ else
+ LOG(3, s, t, " Filter out %d (%s)\n", fout, ip_filters[fout - 1].name);
+
+ filter_session(s, fin, fout);
+ }
+
+ // process cisco av-pair(s)
+ for (i = 0; i < avp; i++)
+ {
+ LOG(3, s, t, " Cisco-AVPair: %.*s\n", avpair_len[i], avpair[i]);
+ handle_avpair(s, avpair[i], avpair_len[i]);
+ }
+
+ cluster_send_session(s);
+ break;
+ }
+
+ // send response
+ packet = buf;
+ *packet++ = r_code;
+ *packet++ = r_id;
+ packet += 2;
+ memset(packet, 0, 16);
+ packet += 16;
+ len = 20;
+
+ // add attributes
+ if (error)
+ {
+ // add error cause
+ *packet++ = 101;
+ *packet++ = 6;
+ *(uint32_t *) packet = htonl(error);
+ len += 6;
+ }
+
+ *((uint16_t *)(buf + 2)) = htons(len);
+
+ // make vector
+ i = strlen(config->radiussecret);
+ if (i > 16) i = 16;
+
+ MD5Init(&ctx);
+ MD5Update(&ctx, buf, len);
+ MD5Update(&ctx, config->radiussecret, i);
+ MD5Final(hash, &ctx);
+ memcpy(buf + 4, hash, 16);
+
+ 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)
+ LOG(0, 0, 0, "Error sending DAE response packet: %s\n", strerror(errno));
+}
projects / l2tpns.git / blobdiff