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l2tpns/radius.c
Brendan O'Dea 889746f11c add service-type/framed-protocol to RADIUS records
2005-12-19 06:18:13 +00:00

1068 lines
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// L2TPNS Radius Stuff
char const *cvs_id_radius = "$Id: radius.c,v 1.47 2005-12-19 06:18:13 bodea Exp $";
#include <time.h>
#include <stdio.h>
#include <sys/types.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 <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;
extern tunnelt *tunnel;
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)
{
int i;
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++)
{
int flags;
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(uint16_t r, sessionidt s)
{
if (s) sess_local[s].radius = 0;
memset(&radius[r], 0, sizeof(radius[r])); // radius[r].state = RADIUSNULL;
}
static uint16_t get_free_radius()
{
int count;
static uint32_t 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, "Can't find a free radius session! This is very bad!\n");
return 0;
}
uint16_t radiusnew(sessionidt s)
{
uint16_t r = sess_local[s].radius;
/* re-use */
if (r)
{
LOG(3, s, session[s].tunnel, "Re-used radius %d\n", r);
return r;
}
if (!(r = get_free_radius()))
{
LOG(1, s, session[s].tunnel, "No free RADIUS sessions\n");
STAT(radius_overflow);
return 0;
};
memset(&radius[r], 0, sizeof(radius[r]));
sess_local[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.
random_data(radius[r].auth, sizeof(radius[r].auth));
LOG(3, s, session[s].tunnel, "Allocated radius %d\n", r);
return r;
}
// Send a RADIUS request
void radiussend(uint16_t r, uint8_t state)
{
struct sockaddr_in addr;
uint8_t b[4096]; // RADIUS packet
char pass[129];
int pl;
uint8_t *p;
sessionidt s;
CSTAT(radiussend);
s = radius[r].session;
if (!config->numradiusservers)
{
LOG(0, s, session[s].tunnel, "No RADIUS servers\n");
return;
}
if (!*config->radiussecret)
{
LOG(0, s, session[s].tunnel, "No RADIUS secret\n");
return;
}
if (state != RADIUSAUTH && !config->radius_accounting)
{
// Radius accounting is turned off
radiusclear(r, s);
return;
}
if (radius[r].state != state)
radius[r].try = 0;
radius[r].state = state;
radius[r].retry = backoff(radius[r].try++) + 20; // 3s, 4s, 6s, 10s...
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 (state == RADIUSAUTH)
sessionshutdown(s, "RADIUS timeout.", 3, 0);
else
{
LOG(1, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n",
radius_state(state));
radiusclear(r, s);
}
STAT(radius_timeout);
}
else
{
STAT(radius_retries);
radius[r].state = RADIUSWAIT;
radius[r].retry = 100;
}
return;
}
// contruct RADIUS access request
switch (state)
{
case RADIUSAUTH:
b[0] = AccessRequest; // access request
break;
case RADIUSSTART:
case RADIUSSTOP:
case RADIUSINTERIM:
b[0] = AccountingRequest; // accounting request
break;
default:
LOG(0, 0, 0, "Unknown radius state %d\n", state);
}
b[1] = r >> RADIUS_SHIFT; // identifier
memcpy(b + 4, radius[r].auth, 16);
p = b + 20;
if (s)
{
*p = 1; // user name
p[1] = strlen(session[s].user) + 2;
strcpy((char *) p + 2, session[s].user);
p += p[1];
}
if (state == RADIUSAUTH)
{
if (radius[r].chap)
{
*p = 3; // CHAP password
p[1] = 19; // length
p[2] = radius[r].id; // ID
memcpy(p + 3, radius[r].pass, 16); // response from CHAP request
p += p[1];
*p = 60; // CHAP Challenge
p[1] = 18; // length
memcpy(p + 2, radius[r].auth, 16);
p += p[1];
}
else
{
strcpy(pass, radius[r].pass);
pl = strlen(pass);
while (pl & 15)
pass[pl++] = 0; // pad
if (pl)
{ // encrypt
hasht hash;
int p = 0;
while (p < pl)
{
MD5_CTX ctx;
MD5_Init(&ctx);
MD5_Update(&ctx, config->radiussecret, strlen(config->radiussecret));
if (p)
MD5_Update(&ctx, pass + p - 16, 16);
else
MD5_Update(&ctx, radius[r].auth, 16);
MD5_Final(hash, &ctx);
do
{
pass[p] ^= hash[p & 15];
p++;
}
while (p & 15);
}
}
*p = 2; // password
p[1] = pl + 2;
if (pl)
memcpy(p + 2, pass, pl);
p += p[1];
}
}
else if (state == RADIUSSTART || state == RADIUSSTOP || state == RADIUSINTERIM)
{ // accounting
*p = 40; // accounting type
p[1] = 6;
*(uint32_t *) (p + 2) = htonl(state - RADIUSSTART + 1); // start=1, stop=2, interim=3
p += p[1];
if (s)
{
*p = 44; // session ID
p[1] = 18;
sprintf((char *) p + 2, "%08X%08X", session[s].unique_id, session[s].opened);
p += p[1];
if (state == RADIUSSTART)
{ // start
*p = 41; // delay
p[1] = 6;
*(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
p += p[1];
sess_local[s].last_interim = time_now; // Setup "first" Interim
}
else
{ // stop, interim
*p = 42; // input octets
p[1] = 6;
*(uint32_t *) (p + 2) = htonl(session[s].cin);
p += p[1];
*p = 43; // output octets
p[1] = 6;
*(uint32_t *) (p + 2) = htonl(session[s].cout);
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;
*(uint32_t *) (p + 2) = htonl(session[s].pin);
p += p[1];
*p = 48; // output packets
p[1] = 6;
*(uint32_t *) (p + 2) = htonl(session[s].pout);
p += p[1];
*p = 52; // input gigawords
p[1] = 6;
*(uint32_t *) (p + 2) = htonl(session[s].cin_wrap);
p += p[1];
*p = 53; // output gigawords
p[1] = 6;
*(uint32_t *) (p + 2) = htonl(session[s].cout_wrap);
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[1] = 6;
*(uint32_t *) (p + 2) = htonl(s);
p += p[1];
*p = 6; // Service-Type
p[1] = 6;
*(uint32_t *) (p + 2) = htonl(2); // Framed-User
p += p[1];
*p = 7; // Framed-Protocol
p[1] = 6;
*(uint32_t *) (p + 2) = htonl(1); // PPP
p += p[1];
}
if (s && session[s].ip)
{
*p = 8; // Framed-IP-Address
p[1] = 6;
*(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
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;
*(uint32_t *)(p + 2) = config->bind_address;
p += p[1];
// All AVpairs added
*(uint16_t *) (b + 2) = htons(p - b);
if (state != RADIUSAUTH)
{
// 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;
*(uint32_t *) & addr.sin_addr = config->radiusserver[(radius[r].try - 1) % config->numradiusservers];
{
// 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);
}
LOG_HEX(5, "RADIUS Send", b, (p - b));
sendto(radfds[r & RADIUS_MASK], b, p - b, 0, (void *) &addr, sizeof(addr));
}
static void handle_avpair(sessionidt s, uint8_t *avp, int len)
{
uint8_t *key = avp;
uint8_t *value = memchr(avp, '=', len);
uint8_t 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], (char *) key, (char *) value };
run_plugins(PLUGIN_RADIUS_RESPONSE, &p);
}
}
// process RADIUS response
void processrad(uint8_t *buf, int len, char socket_index)
{
uint8_t b[MAXETHER];
uint16_t r;
sessionidt s;
tunnelidt t = 0;
hasht hash;
uint8_t routes = 0;
int r_code;
int r_id;
CSTAT(processrad);
LOG_HEX(5, "RADIUS Response", buf, len);
if (len < 20 || len < ntohs(*(uint16_t *) (buf + 2)))
{
LOG(1, 0, 0, "Duff RADIUS response length %d\n", len);
return ;
}
r_code = buf[0]; // response type
r_id = buf[1]; // radius reply indentifier.
len = ntohs(*(uint16_t *) (buf + 2));
r = socket_index | (r_id << RADIUS_SHIFT);
s = radius[r].session;
LOG(3, s, session[s].tunnel, "Received %s, radius %d response for session %u (%s, id %d)\n",
radius_state(radius[r].state), r, s, radius_code(r_code), r_id);
if (!s && radius[r].state != RADIUSSTOP)
{
LOG(1, s, session[s].tunnel, " Unexpected RADIUS response\n");
return;
}
if (radius[r].state != RADIUSAUTH && 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;
calc_auth(buf, len, radius[r].auth, hash);
do {
if (memcmp(hash, buf + 4, 16))
{
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 && 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));
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)
{
// run post-auth plugin
struct param_post_auth packet = {
&tunnel[t],
&session[s],
session[s].user,
(r_code == AccessAccept),
radius[r].chap ? PPPCHAP : PPPPAP
};
run_plugins(PLUGIN_POST_AUTH, &packet);
r_code = packet.auth_allowed ? AccessAccept : AccessReject;
// process auth response
if (radius[r].chap)
{
// CHAP
uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP);
if (!p) return; // Abort!
*p = (r_code == AccessAccept) ? 3 : 4; // ack/nak
p[1] = radius[r].id;
*(uint16_t *) (p + 2) = ntohs(4); // no message
tunnelsend(b, (p - b) + 4, t); // send it
LOG(3, s, session[s].tunnel, " CHAP User %s authentication %s.\n", session[s].user,
(r_code == AccessAccept) ? "allowed" : "denied");
}
else
{
// PAP
uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP);
if (!p) return; // Abort!
// ack/nak
*p = r_code;
p[1] = radius[r].id;
*(uint16_t *) (p + 2) = ntohs(5);
p[4] = 0; // no message
tunnelsend(b, (p - b) + 5, t); // send it
LOG(3, s, session[s].tunnel, " PAP User %s authentication %s.\n", session[s].user,
(r_code == AccessAccept) ? "allowed" : "denied");
}
if (r_code == AccessAccept)
{
// Login successful
// Extract IP, routes, etc
uint8_t *p = buf + 20;
uint8_t *e = buf + len;
for (; p + 2 <= e && p[1] && p + p[1] <= e; p += p[1])
{
if (*p == 8)
{
// Framed-IP-Address
if (p[1] < 6) continue;
session[s].ip = ntohl(*(uint32_t *) (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));
if (session[s].ip == 0xFFFFFFFE)
session[s].ip = 0; // assign from pool
}
else if (*p == 135)
{
// DNS address
if (p[1] < 6) continue;
session[s].dns1 = ntohl(*(uint32_t *) (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
if (p[1] < 6) continue;
session[s].dns2 = ntohl(*(uint32_t *) (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)
{
// Framed-Route
in_addr_t ip = 0, mask = 0;
uint8_t u = 0;
uint8_t bits = 0;
uint8_t *n = p + 2;
uint8_t *e = p + p[1];
while (n < e && (isdigit(*n) || *n == '.'))
{
if (*n == '.')
{
ip = (ip << 8) + u;
u = 0;
}
else
u = u * 10 + *n - '0';
n++;
}
ip = (ip << 8) + u;
if (*n == '/')
{
n++;
while (n < e && isdigit(*n))
bits = bits * 10 + *n++ - '0';
mask = (( -1) << (32 - bits));
}
else if ((ip >> 24) < 128)
mask = 0xFF0000;
else if ((ip >> 24) < 192)
mask = 0xFFFF0000;
else
mask = 0xFFFFFF00;
if (routes == MAXROUTE)
{
LOG(1, s, session[s].tunnel, " Too many routes\n");
}
else if (ip)
{
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++;
}
}
else if (*p == 11)
{
// Filter-Id
char *filter = (char *) p + 2;
int l = p[1] - 2;
char *suffix;
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))
fp = &session[s].filter_in;
else if (l - b == 4 && !memcmp("out", suffix+1, 3))
fp = &session[s].filter_out;
l = b;
}
if (!fp)
{
LOG(3, s, session[s].tunnel, " Invalid filter\n");
continue;
}
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)
{
// 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);
}
}
else if (*p == 99)
{
// Framed-IPv6-Route
struct in6_addr r6;
int prefixlen;
uint8_t *n = p + 2;
uint8_t *e = p + p[1];
uint8_t *m = memchr(n, '/', e - p);
*m++ = 0;
inet_pton(AF_INET6, (char *) n, &r6);
prefixlen = 0;
while (m < e && isdigit(*m)) {
prefixlen = prefixlen * 10 + *m++ - '0';
}
if (prefixlen)
{
LOG(3, s, session[s].tunnel,
" Radius reply contains route for %s/%d\n",
n, prefixlen);
session[s].ipv6route = r6;
session[s].ipv6prefixlen = prefixlen;
}
}
}
}
else if (r_code == AccessReject)
{
LOG(2, s, session[s].tunnel, " Authentication rejected for %s\n", session[s].user);
sessionkill(s, "Authentication rejected");
break;
}
if (!session[s].dns1 && config->default_dns1)
{
session[s].dns1 = ntohl(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 = ntohl(config->default_dns2);
LOG(3, s, t, " Sending dns2 = %s\n", fmtaddr(config->default_dns2, 0));
}
// Valid Session, set it up
session[s].unique_id = 0;
sessionsetup(s, t);
}
else
{
// An ack for a stop or start record.
LOG(3, s, t, " RADIUS accounting ack recv in state %s\n", radius_state(radius[r].state));
break;
}
} while (0);
// finished with RADIUS
radiusclear(r, s);
}
// Send a retry for RADIUS/CHAP message
void radiusretry(uint16_t r)
{
sessionidt s = radius[r].session;
tunnelidt t = 0;
CSTAT(radiusretry);
if (s) t = session[s].tunnel;
switch (radius[r].state)
{
case RADIUSCHAP: // sending CHAP down PPP
sendchap(s, t);
break;
case RADIUSAUTH: // 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
radiussend(r, radius[r].state);
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, s, session[s].tunnel, "Freeing up radius session %d\n", r);
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 *packet, attribute;
hasht hash;
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));
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
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;
}
// 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((char *) 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)
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;
// skip len + auth
packet += 2 + 16;
len = packet - buf;
// 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
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)
LOG(0, 0, 0, "Error sending DAE response packet: %s\n", strerror(errno));
}
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