// L2TPNS PPP Stuff
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.21 2004/11/05 04:55:27 bodea Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.59 2005/05/10 10:54:34 jonmcd Exp $";
#include <stdio.h>
#include <string.h>
extern radiust *radius;
extern int tunfd;
extern char hostname[];
-extern u32 eth_tx;
+extern uint32_t eth_tx;
extern time_t time_now;
-extern struct configt *config;
+extern configt *config;
-void sendccp(tunnelidt t, sessionidt s);
+static void initccp(tunnelidt t, sessionidt s);
+static uint8_t *add_lcp_auth(uint8_t *b, int size, int authtype);
// Process PAP messages
-void processpap(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
{
- char user[129];
- char pass[129];
- u16 hl;
+ char user[MAXUSER];
+ char pass[MAXPASS];
+ uint16_t hl;
- CSTAT(call_processpap);
+ CSTAT(processpap);
LOG_HEX(5, "PAP", p, l);
if (l < 4)
{
- LOG(1, 0, s, t, "Short PAP %u bytes\n", l);
+ LOG(1, s, t, "Short PAP %u bytes\n", l);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "Short PAP packet.", 3, 0);
+ return;
}
- if ((hl = ntohs(*(u16 *) (p + 2))) > l)
+ if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
{
- LOG(1, 0, s, t, "Length mismatch PAP %u/%u\n", hl, l);
+ LOG(1, s, t, "Length mismatch PAP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "PAP length mismatch.", 3, 0);
+ return;
}
l = hl;
if (*p != 1)
{
- LOG(1, 0, s, t, "Unexpected PAP code %d\n", *p);
+ LOG(1, s, t, "Unexpected PAP code %d\n", *p);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "Unexpected PAP code.", 3, 0);
+ return;
}
{
- u8 *b = p;
+ uint8_t *b = p;
b += 4;
+ user[0] = pass[0] = 0;
if (*b && *b < sizeof(user))
+ {
memcpy(user, b + 1, *b);
- user[*b] = 0;
- b += 1 + *b;
- if (*b && *b < sizeof(pass))
- memcpy(pass, b + 1, *b);
- pass[*b] = 0;
- LOG(3, 0, s, t, "PAP login %s/%s\n", user, pass);
+ user[*b] = 0;
+ b += 1 + *b;
+ if (*b && *b < sizeof(pass))
+ {
+ memcpy(pass, b + 1, *b);
+ pass[*b] = 0;
+ }
+ }
+ LOG(3, s, t, "PAP login %s/%s\n", user, pass);
}
- if (session[s].ip || !session[s].radius)
+ if (session[s].ip || !sess_local[s].radius)
{
// respond now, either no RADIUS available or already authenticated
- u8 b[MAXCONTROL];
- u8 id = p[1];
- u8 *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP);
- if (!p) { // Failed to make ppp header!
- LOG(1,0,0,0, "Failed to make PPP header in process pap!\n");
- return;
- }
+ uint8_t b[MAXCONTROL];
+ uint8_t id = p[1];
+ uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP);
+ if (!p) return;
+
if (session[s].ip)
- *p = 2; // ACK
+ *p = 2; // ACK
else
- *p = 3; // cant authorise
+ *p = 3; // cant authorise
p[1] = id;
- *(u16 *) (p + 2) = htons(5); // length
- p[4] = 0; // no message
+ *(uint16_t *) (p + 2) = htons(5); // length
+ p[4] = 0; // no message
if (session[s].ip)
{
- LOG(3, session[s].ip, s, t, "Already an IP allocated: %s (%d)\n", inet_toa(htonl(session[s].ip)), session[s].ip_pool_index);
+ LOG(3, s, t, "Already an IP allocated: %s (%d)\n",
+ fmtaddr(htonl(session[s].ip), 0), session[s].ip_pool_index);
+
session[s].flags &= ~SF_IPCP_ACKED;
}
else
{
- LOG(1, 0, s, t, "No radius session available to authenticate session...\n");
+ LOG(1, s, t, "No radius session available to authenticate session...\n");
}
- LOG(3, 0, s, t, "Fallback response to PAP (%s)\n", (session[s].ip) ? "ACK" : "NAK");
+ LOG(3, s, t, "Fallback response to PAP (%s)\n", (session[s].ip) ? "ACK" : "NAK");
tunnelsend(b, 5 + (p - b), t); // send it
+ sessionshutdown(s, "PAP authentication failed.", 3, 0);
}
else
{
// set up RADIUS request
- u16 r = session[s].radius;
+ uint16_t r = sess_local[s].radius;
// Run PRE_AUTH plugins
struct param_pre_auth packet = { &tunnel[t], &session[s], strdup(user), strdup(pass), PPPPAP, 1 };
run_plugins(PLUGIN_PRE_AUTH, &packet);
if (!packet.continue_auth)
{
- LOG(3, 0, s, t, "A plugin rejected PRE_AUTH\n");
+ LOG(3, s, t, "A plugin rejected PRE_AUTH\n");
if (packet.username) free(packet.username);
if (packet.password) free(packet.password);
return;
free(packet.password);
radius[r].id = p[1];
- LOG(3, 0, s, t, "Sending login for %s/%s to radius\n", user, pass);
+ LOG(3, s, t, "Sending login for %s/%s to radius\n", user, pass);
radiussend(r, RADIUSAUTH);
}
}
// Process CHAP messages
-void processchap(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
{
- u16 r;
- u16 hl;
+ uint16_t r;
+ uint16_t hl;
- CSTAT(call_processchap);
+ CSTAT(processchap);
LOG_HEX(5, "CHAP", p, l);
- r = session[s].radius;
+ r = sess_local[s].radius;
if (!r)
{
- LOG(1, 0, s, t, "Unexpected CHAP message\n");
-
-// FIXME: Need to drop the session here.
-
+ LOG(1, s, t, "Unexpected CHAP message\n");
STAT(tunnel_rx_errors);
+ sessionshutdown(s, "Unexpected CHAP message.", 3, 0);
return;
}
if (l < 4)
{
- LOG(1, 0, s, t, "Short CHAP %u bytes\n", l);
+ LOG(1, s, t, "Short CHAP %u bytes\n", l);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "Short CHAP packet.", 3, 0);
+ return;
}
- if ((hl = ntohs(*(u16 *) (p + 2))) > l)
+ if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
{
- LOG(1, 0, s, t, "Length mismatch CHAP %u/%u\n", hl, l);
+ LOG(1, s, t, "Length mismatch CHAP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "CHAP length mismatch.", 3, 0);
+ return;
}
l = hl;
if (*p != 2)
{
- LOG(1, 0, s, t, "Unexpected CHAP response code %d\n", *p);
+ LOG(1, s, t, "Unexpected CHAP response code %d\n", *p);
STAT(tunnel_rx_errors);
+ sessionshutdown(s, "CHAP length mismatch.", 3, 0);
return;
}
if (p[1] != radius[r].id)
{
- LOG(1, 0, s, t, "Wrong CHAP response ID %d (should be %d) (%d)\n", p[1], radius[r].id, r);
+ LOG(1, s, t, "Wrong CHAP response ID %d (should be %d) (%d)\n", p[1], radius[r].id, r);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "Unexpected CHAP response ID.", 3, 0);
+ return;
}
if (l < 5 || p[4] != 16)
{
- LOG(1, 0, s, t, "Bad CHAP response length %d\n", l < 5 ? -1 : p[4]);
+ LOG(1, s, t, "Bad CHAP response length %d\n", l < 5 ? -1 : p[4]);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "Bad CHAP response length.", 3, 0);
+ return;
}
l -= 5;
p += 5;
if (l < 16 || l - 16 >= sizeof(session[s].user))
{
- LOG(1, 0, s, t, "CHAP user too long %d\n", l - 16);
+ LOG(1, s, t, "CHAP user too long %d\n", l - 16);
STAT(tunnel_rx_errors);
- return ;
+ sessionshutdown(s, "CHAP username too long.", 3, 0);
+ return;
}
// Run PRE_AUTH plugins
run_plugins(PLUGIN_PRE_AUTH, &packet);
if (!packet.continue_auth)
{
- LOG(3, 0, s, t, "A plugin rejected PRE_AUTH\n");
+ LOG(3, s, t, "A plugin rejected PRE_AUTH\n");
if (packet.username) free(packet.username);
if (packet.password) free(packet.password);
return;
}
radius[r].chap = 1;
- LOG(3, 0, s, t, "CHAP login %s\n", session[s].user);
+ LOG(3, s, t, "CHAP login %s\n", session[s].user);
radiussend(r, RADIUSAUTH);
}
-char *ppp_lcp_types[] = {
- NULL,
- "ConfigReq",
- "ConfigAck",
- "ConfigNak",
- "ConfigRej",
- "TerminateReq",
- "TerminateAck",
- "CodeRej",
- "ProtocolRej",
- "EchoReq",
- "EchoReply",
- "DiscardRequest",
- "IdentRequest",
-};
-
-void dumplcp(u8 *p, int l)
+static void dumplcp(uint8_t *p, int l)
{
int x = l - 4;
- u8 *o = (p + 4);
+ uint8_t *o = (p + 4);
LOG_HEX(5, "PPP LCP Packet", p, l);
- LOG(4, 0, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_lcp_types[(int)*p], ntohs( ((u16 *) p)[1]) );
- LOG(4, 0, 0, 0, "Length: %d\n", l);
+ LOG(4, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_lcp_type((int)*p), ntohs( ((uint16_t *) p)[1]) );
+ LOG(4, 0, 0, "Length: %d\n", l);
if (*p != ConfigReq && *p != ConfigRej && *p != ConfigAck)
return;
int length = o[1];
if (length < 2)
{
- LOG(4, 0, 0, 0, " Option length is %d...\n", length);
+ LOG(4, 0, 0, " Option length is %d...\n", length);
break;
}
if (type == 0)
{
- LOG(4, 0, 0, 0, " Option type is 0...\n");
+ LOG(4, 0, 0, " Option type is 0...\n");
x -= length;
o += length;
continue;
{
case 1: // Maximum-Receive-Unit
if (length == 4)
- LOG(4, 0, 0, 0, " %s %d\n", lcp_types[type], ntohs(*(u16 *)(o + 2)));
+ LOG(4, 0, 0, " %s %d\n", lcp_type(type), ntohs(*(uint16_t *)(o + 2)));
else
- LOG(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length);
+ LOG(4, 0, 0, " %s odd length %d\n", lcp_type(type), length);
+ break;
+ case 2: // Async-Control-Character-Map
+ if (length == 6)
+ {
+ uint32_t asyncmap = ntohl(*(uint32_t *)(o + 2));
+ LOG(4, 0, 0, " %s %x\n", lcp_type(type), asyncmap);
+ }
+ else
+ LOG(4, 0, 0, " %s odd length %d\n", lcp_type(type), length);
break;
case 3: // Authentication-Protocol
+ if (length == 4)
{
- if (length == 4)
- {
- int proto = ntohs(*(u16 *)(o + 2));
- LOG(4, 0, 0, 0, " %s 0x%x (%s)\n", lcp_types[type], proto,
- proto == PPPCHAP ? "CHAP" :
- proto == PPPPAP ? "PAP" : "UNKNOWN");
- }
- else
- LOG(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length);
- break;
+ int proto = ntohs(*(uint16_t *)(o + 2));
+ LOG(4, 0, 0, " %s 0x%x (%s)\n", lcp_type(type), proto,
+ proto == PPPPAP ? "PAP" : "UNSUPPORTED");
+ }
+ else if (length == 5)
+ {
+ int proto = ntohs(*(uint16_t *)(o + 2));
+ int algo = *(uint8_t *)(o + 4);
+ LOG(4, 0, 0, " %s 0x%x 0x%x (%s)\n", lcp_type(type), proto, algo,
+ (proto == PPPCHAP && algo == 5) ? "CHAP MD5" : "UNSUPPORTED");
}
+ else
+ LOG(4, 0, 0, " %s odd length %d\n", lcp_type(type), length);
+ break;
case 4: // Quality-Protocol
{
- u32 qp = ntohl(*(u32 *)(o + 2));
- LOG(4, 0, 0, 0, " %s %x\n", lcp_types[type], qp);
- break;
+ uint32_t qp = ntohl(*(uint32_t *)(o + 2));
+ LOG(4, 0, 0, " %s %x\n", lcp_type(type), qp);
}
+ break;
case 5: // Magic-Number
+ if (length == 6)
{
- if (length == 6)
- {
- u32 magicno = ntohl(*(u32 *)(o + 2));
- LOG(4, 0, 0, 0, " %s %x\n", lcp_types[type], magicno);
- }
- else
- LOG(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length);
- break;
+ uint32_t magicno = ntohl(*(uint32_t *)(o + 2));
+ LOG(4, 0, 0, " %s %x\n", lcp_type(type), magicno);
}
+ else
+ LOG(4, 0, 0, " %s odd length %d\n", lcp_type(type), length);
+ break;
case 7: // Protocol-Field-Compression
- {
- LOG(4, 0, 0, 0, " %s\n", lcp_types[type]);
- break;
- }
case 8: // Address-And-Control-Field-Compression
- {
- LOG(4, 0, 0, 0, " %s\n", lcp_types[type]);
- break;
- }
+ LOG(4, 0, 0, " %s\n", lcp_type(type));
+ break;
default:
- LOG(2, 0, 0, 0, " Unknown PPP LCP Option type %d\n", type);
+ LOG(2, 0, 0, " Unknown PPP LCP Option type %d\n", type);
break;
}
x -= length;
}
// Process LCP messages
-void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
{
- u8 b[MAXCONTROL];
- u8 *q = NULL;
- u32 magicno = 0;
- u16 hl;
+ uint8_t b[MAXCONTROL];
+ uint8_t *q = NULL;
+ uint32_t magicno = 0;
+ uint16_t hl;
- CSTAT(call_processlcp);
+ CSTAT(processlcp);
LOG_HEX(5, "LCP", p, l);
if (l < 4)
{
- LOG(1, session[s].ip, s, t, "Short LCP %d bytes\n", l);
+ LOG(1, s, t, "Short LCP %d bytes\n", l);
STAT(tunnel_rx_errors);
return ;
}
- if ((hl = ntohs(*(u16 *) (p + 2))) > l)
+ if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
{
- LOG(1, 0, s, t, "Length mismatch LCP %u/%u\n", hl, l);
+ LOG(1, s, t, "Length mismatch LCP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
return ;
}
if (*p == ConfigAck)
{
- LOG(3, session[s].ip, s, t, "LCP: Discarding ConfigAck\n");
+ int x = l - 4;
+ uint8_t *o = (p + 4);
+
+ LOG(3, s, t, "LCP: ConfigAck (%d bytes)...\n", l);
+ if (config->debug > 3) dumplcp(p, l);
+
+ while (x > 2)
+ {
+ int type = o[0];
+ int length = o[1];
+
+ if (length == 0 || type == 0 || x < length) break;
+ switch (type)
+ {
+ case 3: // Authentication-Protocol
+ {
+ int proto = ntohs(*(uint16_t *)(o + 2));
+ if (proto == PPPCHAP && *(o + 4) == 5)
+ sendchap(t, s);
+ }
+
+ break;
+ }
+ x -= length;
+ o += length;
+ }
+
session[s].flags |= SF_LCP_ACKED;
}
else if (*p == ConfigReq)
{
int x = l - 4;
- u8 *o = (p + 4);
+ uint8_t *o = (p + 4);
+ uint8_t *response = 0;
- LOG(3, session[s].ip, s, t, "LCP: ConfigReq (%d bytes)...\n", l);
+ LOG(3, s, t, "LCP: ConfigReq (%d bytes)...\n", l);
if (config->debug > 3) dumplcp(p, l);
while (x > 2)
{
int type = o[0];
int length = o[1];
- if (length == 0 || type == 0) break;
+
+ if (length == 0 || type == 0 || x < length) break;
switch (type)
{
case 1: // Maximum-Receive-Unit
- session[s].mru = ntohs(*(u16 *)(o + 2));
+ session[s].mru = ntohs(*(uint16_t *)(o + 2));
break;
- case 2: // asyncmap
- LOG_HEX(2, "PPP LCP Packet", p, l);
- LOG(2, 0, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_lcp_types[(int)*p], ntohs( ((u16 *) p)[1]) );
+
+ case 2: // Async-Control-Character-Map
+ if (!ntohl(*(uint32_t *)(o + 2))) // all bits zero is OK
+ break;
+
+ if (response && *response != ConfigNak) // rej already queued
+ break;
+
+ LOG(2, s, t, " Remote requesting asyncmap. Rejecting.\n");
+ if (!response)
+ {
+ q = response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP);
+ if (!q) break;
+ *q = ConfigNak;
+ q += 4;
+ }
+
+ if ((q - b + 11) > sizeof(b))
+ {
+ LOG(2, s, t, "LCP overflow for asyncmap ConfigNak.\n");
+ break;
+ }
+
+ *q++ = type;
+ *q++ = 6;
+ memset(q, 0, 4); // asyncmap 0
+ q += 4;
break;
+
case 3: // Authentication-Protocol
{
- int proto = ntohs(*(u16 *)(o + 2));
- if (proto == PPPCHAP)
+ int proto = ntohs(*(uint16_t *)(o + 2));
+ char proto_name[] = "0x0000";
+ uint8_t *a;
+
+ if (proto == PPPPAP)
+ {
+ if (config->radius_authtypes & AUTHPAP)
+ break;
+
+ strcpy(proto_name, "PAP");
+ }
+ else if (proto == PPPCHAP)
{
- LOG(2, session[s].ip, s, t, " Remote end is trying to do CHAP. Rejecting it.\n");
+ if (config->radius_authtypes & AUTHCHAP
+ && *(o + 4) == 5) // MD5
+ break;
+
+ strcpy(proto_name, "CHAP");
+ }
+ else
+ sprintf(proto_name, "%#4.4x", proto);
+
+ if (response && *response != ConfigNak) // rej already queued
+ break;
- if (!q)
+ LOG(2, s, t, " Remote requesting %s authentication. Rejecting.\n", proto_name);
+
+ if (!response)
+ {
+ q = response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP);
+ if (!q) break;
+ *q = ConfigNak;
+ q += 4;
+ }
+
+ a = add_lcp_auth(q, sizeof(b) - (q - b), config->radius_authprefer);
+ if (!a)
+ {
+ LOG(2, s, t, "LCP overflow for %s ConfigNak.\n", proto_name);
+ break;
+ }
+
+ q = a;
+
+ if (config->radius_authtypes != config->radius_authprefer)
+ {
+ a = add_lcp_auth(q, sizeof(b) - (q - b), config->radius_authtypes & ~config->radius_authprefer);
+ if (!a)
{
- q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
- if (!q) {
- LOG(2, session[s].ip, s, t, " Failed to send packet.\n");
- break;
- }
- *q++ = ConfigNak;
+ LOG(2, s, t, "LCP overflow for %s ConfigNak.\n", proto_name);
+ break;
}
- memcpy(q, o, length);
- *(u16 *)(q += 2) = htons(PPPPAP); // NAK -> Use PAP instead
- q += length;
+
+ q = a;
}
+
break;
}
+ break;
+
case 5: // Magic-Number
- {
- magicno = ntohl(*(u32 *)(o + 2));
- break;
- }
+ magicno = ntohl(*(uint32_t *)(o + 2));
+ break;
+
case 4: // Quality-Protocol
case 7: // Protocol-Field-Compression
case 8: // Address-And-Control-Field-Compression
+ break;
+
+ default: // Reject any unknown options
+ LOG(2, s, t, " Rejecting PPP LCP Option type %d\n", type);
+ if (!response || *response != ConfigRej) // drop nak in favour of rej
+ {
+ q = response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP);
+ if (!q) break;
+ *q = ConfigRej;
+ q += 4;
+ }
+
+ if ((q - b + length) > sizeof(b))
+ {
+ LOG(2, s, t, "LCP overflow for ConfigRej (type=%d).\n", type);
break;
- case 13: // CallBack option for LCP extention of win2000/routers L2TP client
- case 17:
- case 18:
- {
- // Reject LCP CallBack
- LOG(2, session[s].ip, s, t, " PPP LCP Option type %d, len=%d\n", type, length);
- memcpy(p + 4, o, length);
- *(u16 *)(p + 2) = htons(length + 4);
- *p = ConfigRej;
- q = makeppp(b,sizeof(b), p, length + 4, t, s, PPPLCP);
- tunnelsend(b, 12 + length + 4, t);
- return;
}
- default:
- // Reject Unknown LCP Option to stop to send it again
- LOG(2, session[s].ip, s, t, " Unknown PPP LCP Option type %d\n", type);
- memcpy(p + 4, o, length);
- *(u16 *)(p + 2) = htons(length + 4);
- *p = ConfigRej;
- q = makeppp(b,sizeof(b), p, length + 4, t, s, PPPLCP);
- tunnelsend(b, 12 + length + 4, t);
- return;
+ memcpy(q, o, length);
+ q += length;
}
x -= length;
o += length;
}
- if (!(session[s].flags & SF_LCP_ACKED))
- initlcp(t, s);
-
- if (!q)
+ if (response)
{
- // Send back a ConfigAck
- LOG(3, session[s].ip, s, t, "ConfigReq accepted, sending as Ack\n");
- q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
- if (!q)
- {
- LOG(3, session[s].ip, s, t, " failed to create packet.\n");
- return;
- }
- *q = ConfigAck;
- tunnelsend(b, l + (q - b), t);
+ l = q - response; // LCP packet length
+ *((uint16_t *) (response + 2)) = htons(l); // update header
}
else
{
- // Already built a ConfigNak... send it
- LOG(3, session[s].ip, s, t, "Sending ConfigNak\n");
- tunnelsend(b, l + (q - b), t);
+ // Send packet back as ConfigAck
+ response = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
+ if (!response) return;
+ *response = ConfigAck;
}
+
+ LOG(3, s, t, "Sending %s\n", ppp_lcp_type(*response));
+ tunnelsend(b, l + response - b, t);
+
+ if (!(session[s].flags & SF_LCP_ACKED))
+ sendlcp(t, s, config->radius_authprefer);
}
else if (*p == ConfigNak)
{
- LOG(1, session[s].ip, s, t, "Remote end sent a ConfigNak. Ignoring\n");
+ int x = l - 4;
+ uint8_t *o = (p + 4);
+ int authtype = 0;
+
+ LOG(3, s, t, "LCP: ConfigNak (%d bytes)...\n", l);
if (config->debug > 3) dumplcp(p, l);
- return ;
+
+ while (x > 2)
+ {
+ int type = o[0];
+ int length = o[1];
+
+ if (length == 0 || type == 0 || x < length) break;
+ switch (type)
+ {
+ case 1: // Maximum-Receive-Unit
+ session[s].mru = ntohs(*(uint16_t *)(o + 2));
+ LOG(3, s, t, " Remote requested MRU of %u\n", session[s].mru);
+ break;
+
+ case 3: // Authentication-Protocol
+ if (authtype)
+ break;
+
+ {
+ int proto = ntohs(*(uint16_t *)(o + 2));
+ if (proto == PPPPAP)
+ {
+ authtype = config->radius_authtypes & AUTHPAP;
+ LOG(3, s, t, " Remote requested PAP authentication...%sing\n",
+ authtype ? "accept" : "reject");
+ }
+ else if (proto == PPPCHAP && *(o + 4) == 5)
+ {
+ authtype = config->radius_authtypes & AUTHCHAP;
+ LOG(3, s, t, " Remote requested CHAP authentication...%sing\n",
+ authtype ? "accept" : "reject");
+ }
+ else
+ {
+ LOG(3, s, t, " Rejecting unsupported authentication %#4x\n",
+ proto);
+ }
+ }
+
+ if (!authtype)
+ {
+ sessionshutdown(s, "Unsupported authentication.", 3, 0);
+ return;
+ }
+
+ break;
+
+ default:
+ LOG(2, s, t, " Remote NAKed LCP type %u?\n", type);
+ break;
+ }
+ x -= length;
+ o += length;
+ }
+
+ if (!authtype)
+ authtype = config->radius_authprefer;
+
+ sendlcp(t, s, authtype);
}
else if (*p == TerminateReq)
{
+ LOG(3, s, t, "LCP: Received TerminateReq. Sending TerminateAck\n");
*p = TerminateAck; // close
q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
- if (!q) {
- LOG(3, session[s].ip, s, t, "Failed to create PPP packet in processlcp.\n");
- return;
- }
- LOG(3, session[s].ip, s, t, "LCP: Received TerminateReq. Sending TerminateAck\n");
- sessionshutdown(s, "Remote end closed connection.");
+ if (!q) return;
tunnelsend(b, l + (q - b), t); // send it
+ sessionshutdown(s, "Remote end closed connection.", 3, 0);
}
else if (*p == TerminateAck)
{
- sessionshutdown(s, "Connection closed.");
+ sessionshutdown(s, "Connection closed.", 3, 0);
+ }
+ else if (*p == ProtocolRej)
+ {
+ if (*(uint16_t *) (p+4) == htons(PPPIPV6CP))
+ {
+ LOG(3, s, t, "IPv6 rejected\n");
+ session[s].flags |= SF_IPV6_NACKED;
+ }
+ else
+ {
+ LOG(1, s, t, "Unexpected LCP protocol reject 0x%X\n",
+ ntohs(*(uint16_t *) (p+4)));
+ STAT(tunnel_rx_errors);
+ }
}
else if (*p == EchoReq)
{
+ LOG(5, s, t, "LCP: Received EchoReq. Sending EchoReply\n");
*p = EchoReply; // reply
- *(u32 *) (p + 4) = htonl(session[s].magic); // our magic number
+ *(uint32_t *) (p + 4) = htonl(session[s].magic); // our magic number
q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
- if (!q) {
- LOG(3, session[s].ip, s, t, " failed to send EchoReply.\n");
- return;
- }
- LOG(5, session[s].ip, s, t, "LCP: Received EchoReq. Sending EchoReply\n");
+ if (!q) return;
tunnelsend(b, l + (q - b), t); // send it
}
else if (*p == EchoReply)
*p = CodeRej;
if (l > MAXCONTROL)
{
- LOG(1, 0, s, t, "Truncated Ident Packet (length=%d) to 1400 bytes\n", l);
+ LOG(1, s, t, "Truncated Ident Packet (length=%d) to 1400 bytes\n", l);
l = 1400;
}
q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
- if (!q)
- {
- LOG(3, session[s].ip, s, t, "Failed to create IdentRej.\n");
- return;
- }
+ if (!q) return;
LOG_HEX(5, "LCPIdentRej", q, l + 4);
tunnelsend(b, 12 + 4 + l, t);
}
else
{
- LOG(1, session[s].ip, s, t, "Unexpected LCP code %d\n", *p);
+ LOG(1, s, t, "Unexpected LCP code %d\n", *p);
STAT(tunnel_rx_errors);
- return ;
}
}
+// find a PPP option, returns point to option, or 0 if not found
+static uint8_t *findppp(uint8_t *b, uint8_t mtype)
+{
+ uint16_t l = ntohs(*(uint16_t *) (b + 2));
+ if (l < 4)
+ return 0;
+ b += 4;
+ l -= 4;
+ while (l)
+ {
+ if (l < b[1] || !b[1])
+ return 0; // faulty
+ if (*b == mtype)
+ return b;
+ l -= b[1];
+ b += b[1];
+ }
+ return 0;
+}
+
// Process IPCP messages
-void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
{
- u16 hl;
+ uint16_t hl;
- CSTAT(call_processipcp);
+ CSTAT(processipcp);
LOG_HEX(5, "IPCP", p, l);
if (l < 5)
{
- LOG(1, 0, s, t, "Short IPCP %d bytes\n", l);
+ LOG(1, s, t, "Short IPCP %d bytes\n", l);
STAT(tunnel_rx_errors);
return ;
}
- if ((hl = ntohs(*(u16 *) (p + 2))) > l)
+ if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
{
- LOG(1, 0, s, t, "Length mismatch IPCP %u/%u\n", hl, l);
+ LOG(1, s, t, "Length mismatch IPCP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
return ;
}
if (*p == ConfigAck)
{
// happy with our IPCP
- u16 r = session[s].radius;
+ uint16_t r = sess_local[s].radius;
if ((!r || radius[r].state == RADIUSIPCP) && !session[s].walled_garden)
{
if (!r)
}
session[s].flags |= SF_IPCP_ACKED;
- LOG(3, session[s].ip, s, t, "IPCP Acked, session is now active\n");
+ LOG(3, s, t, "IPCP Acked, session is now active\n");
+
+ // clear LCP_ACKED/CCP_ACKED flag for possible fast renegotiaion for routers
+ session[s].flags &= ~(SF_LCP_ACKED|SF_CCP_ACKED);
+
return;
}
if (*p != ConfigReq)
{
- LOG(1, 0, s, t, "Unexpected IPCP code %d\n", *p);
+ LOG(1, s, t, "Unexpected IPCP code %d\n", *p);
STAT(tunnel_rx_errors);
return ;
}
- LOG(4, session[s].ip, s, t, "IPCP ConfigReq received\n");
+ LOG(4, s, t, "IPCP ConfigReq received\n");
if (!session[s].ip)
{
- LOG(3, 0, s, t, "Waiting on radius reply\n");
+ LOG(3, s, t, "Waiting on radius reply\n");
return; // have to wait on RADIUS reply
}
// form a config reply quoting the IP in the session
{
- u8 b[MAXCONTROL];
- u8 *i,
- *q;
+ uint8_t b[MAXCONTROL];
+ uint8_t *i, *q;
q = p + 4;
i = p + l;
if (q < i)
{
// reject
- u16 n = 4;
+ uint16_t n = 4;
i = p + l;
if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP)))
- {
- LOG(2, 0, s, t, "Failed to send IPCP ConfigRej\n");
return;
- }
+
*q = ConfigRej;
p += 4;
while (p < i && p[1])
{
if (*p != 0x81 && *p != 0x83 && *p != 3)
{
- LOG(2, 0, s, t, "IPCP reject %d\n", *p);
+ LOG(2, s, t, "IPCP reject %d\n", *p);
memcpy(q + n, p, p[1]);
n += p[1];
}
p += p[1];
}
- *(u16 *) (q + 2) = htons(n);
- LOG(4, session[s].ip, s, t, "Sending ConfigRej\n");
+ *(uint16_t *) (q + 2) = htons(n);
+ LOG(4, s, t, "Sending ConfigRej\n");
tunnelsend(b, n + (q - b), t); // send it
}
else
{
- LOG(4, session[s].ip, s, t, "Sending ConfigAck\n");
+ LOG(4, s, t, "Sending ConfigAck\n");
*p = ConfigAck;
if ((i = findppp(p, 0x81))) // Primary DNS address
{
- if (*(u32 *) (i + 2) != htonl(session[s].dns1))
+ if (*(uint32_t *) (i + 2) != htonl(session[s].dns1))
{
- *(u32 *) (i + 2) = htonl(session[s].dns1);
+ *(uint32_t *) (i + 2) = htonl(session[s].dns1);
*p = ConfigNak;
- LOG(5, session[s].ip, s, t, " DNS1 = %s\n", inet_toa(session[s].dns1));
+ LOG(5, s, t, " DNS1 = %s\n",
+ fmtaddr(htonl(session[s].dns1), 0));
}
}
if ((i = findppp(p, 0x83))) // Secondary DNS address (TBA, is it)
{
- if (*(u32 *) (i + 2) != htonl(session[s].dns2))
+ if (*(uint32_t *) (i + 2) != htonl(session[s].dns2))
{
- *(u32 *) (i + 2) = htonl(session[s].dns2);
+ *(uint32_t *) (i + 2) = htonl(session[s].dns2);
*p = ConfigNak;
- LOG(5, session[s].ip, s, t, " DNS2 = %s\n", inet_toa(session[s].dns2));
+ LOG(5, s, t, " DNS2 = %s\n",
+ fmtaddr(htonl(session[s].dns2), 0));
}
}
i = findppp(p, 3); // IP address
if (!i || i[1] != 6)
{
- LOG(1, 0, s, t, "No IP in IPCP request\n");
+ LOG(1, s, t, "No IP in IPCP request\n");
STAT(tunnel_rx_errors);
return ;
}
- if (*(u32 *) (i + 2) != htonl(session[s].ip))
+ if (*(uint32_t *) (i + 2) != htonl(session[s].ip))
{
- *(u32 *) (i + 2) = htonl(session[s].ip);
+ *(uint32_t *) (i + 2) = htonl(session[s].ip);
*p = ConfigNak;
- LOG(4, session[s].ip, s, t, " No, a ConfigNak, client is requesting IP - sending %s\n",
- inet_toa(htonl(session[s].ip)));
+ LOG(4, s, t, " No, a ConfigNak, client is requesting IP - sending %s\n",
+ fmtaddr(htonl(session[s].ip), 0));
}
if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP)))
+ return;
+
+ tunnelsend(b, l + (q - b), t); // send it
+ }
+ }
+}
+
+// Process IPV6CP messages
+void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+{
+
+ CSTAT(processipv6cp);
+
+ LOG_HEX(5, "IPV6CP", p, l);
+ if (l < 4)
+ {
+ LOG(1, s, t, "Short IPV6CP %d bytes\n", l);
+ STAT(tunnel_rx_errors);
+ return ;
+ }
+ if (*p == ConfigAck)
+ {
+ // happy with our IPV6CP
+ session[s].flags |= SF_IPV6CP_ACKED;
+
+ LOG(3, s, t, "IPV6CP Acked, IPv6 is now active\n");
+ // Add a routed block if configured.
+ if (session[s].ipv6prefixlen)
+ {
+ route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 1);
+ session[s].flags |= SF_IPV6_ROUTED;
+ }
+
+ // Send an initial RA (TODO: Should we send these regularly?)
+ send_ipv6_ra(t, s, NULL);
+ return;
+ }
+ if (*p != ConfigReq)
+ {
+ LOG(1, s, t, "Unexpected IPV6CP code %d\n", *p);
+ STAT(tunnel_rx_errors);
+ return;
+ }
+
+ LOG(4, s, t, "IPV6CP ConfigReq received\n");
+ if (ntohs(*(uint16_t *) (p + 2)) > l)
+ {
+ LOG(1, s, t, "Length mismatch IPV6CP %d/%d\n", ntohs(*(uint16_t *) (p + 2)), l);
+ STAT(tunnel_rx_errors);
+ return ;
+ }
+ if (!session[s].ip)
+ {
+ LOG(3, s, t, "Waiting on radius reply\n");
+ return; // have to wait on RADIUS reply
+ }
+ // form a config reply quoting the IP in the session
+ {
+ uint8_t b[MAXCONTROL];
+ uint8_t *i,
+ *q;
+
+ l = ntohs(*(uint16_t *) (p + 2)); // We must use length from IPV6CP len field
+ q = p + 4;
+ i = p + l;
+ while (q < i && q[1])
+ {
+ if (*q != 1)
+ break;
+ q += q[1];
+ }
+ if (q < i)
+ {
+ // reject
+ uint16_t n = 4;
+ i = p + l;
+ if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPV6CP)))
{
- LOG(2, 0, s, t, " Failed to send IPCP packet.\n");
+ LOG(2, s, t, "Failed to send IPV6CP ConfigRej\n");
+ return;
+ }
+ *q = ConfigRej;
+ p += 4;
+ while (p < i && p[1])
+ {
+ if (*p != 1)
+ {
+ LOG(2, s, t, "IPV6CP reject %d\n", *p);
+ memcpy(q + n, p, p[1]);
+ n += p[1];
+ }
+ p += p[1];
+ }
+ *(uint16_t *) (q + 2) = htons(n);
+ LOG(4, s, t, "Sending ConfigRej\n");
+ tunnelsend(b, n + (q - b), t); // send it
+ }
+ else
+ {
+ LOG(4, s, t, "Sending ConfigAck\n");
+ *p = ConfigAck;
+ i = findppp(p, 1); // IP address
+ if (!i || i[1] != 10)
+ {
+ LOG(1, s, t, "No IP in IPV6CP request\n");
+ STAT(tunnel_rx_errors);
+ return ;
+ }
+ if ((*(uint32_t *) (i + 2) != htonl(session[s].ip)) ||
+ (*(uint32_t *) (i + 6) != 0))
+ {
+ *(uint32_t *) (i + 2) = htonl(session[s].ip);
+ *(uint32_t *) (i + 6) = 0;
+ *p = ConfigNak;
+ LOG(4, s, t,
+ " No, a ConfigNak, client is "
+ "requesting IP - sending %s\n",
+ fmtaddr(htonl(session[s].ip), 0));
+ }
+ if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPV6CP)))
+ {
+ LOG(2, s, t, " Failed to send IPV6CP packet.\n");
return;
}
tunnelsend(b, l + (q - b), t); // send it
//
// This MUST be called with at least 4 byte behind 'p'.
// (i.e. this routine writes to p[-4]).
-void processipin(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
{
- ipt ip;
+ in_addr_t ip;
- CSTAT(call_processipin);
+ CSTAT(processipin);
LOG_HEX(5, "IP", p, l);
- ip = ntohl(*(u32 *)(p + 12));
+ ip = ntohl(*(uint32_t *)(p + 12));
if (l > MAXETHER)
{
- LOG(1, ip, s, t, "IP packet too long %d\n", l);
+ LOG(1, s, t, "IP packet too long %d\n", l);
STAT(tunnel_rx_errors);
return ;
}
// no spoof (do sessionbyip to handled statically routed subnets)
if (ip != session[s].ip && sessionbyip(htonl(ip)) != s)
{
- LOG(5, ip, s, t, "Dropping packet with spoofed IP %s\n", inet_toa(htonl(ip)));
+ LOG(5, s, t, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip), 0));
return;
}
- if (session[s].snoop_ip && session[s].snoop_port)
- {
- // Snooping this session
- snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port);
- }
+ // run access-list if any
+ if (session[s].filter_in && !ip_filter(p, l, session[s].filter_in - 1))
+ return;
// Add on the tun header
p -= 4;
- *(u32 *)p = htonl(0x00000800);
+ *(uint32_t *) p = htonl(PKTIP);
l += 4;
- if (session[s].tbf_in && !config->cluster_iam_master) { // Are we throttled and a slave?
- master_throttle_packet(session[s].tbf_in, p, l); // Pass it to the master for handling.
+ // Are we throttled and a slave?
+ if (session[s].tbf_in && !config->cluster_iam_master) {
+ // Pass it to the master for handling.
+ master_throttle_packet(session[s].tbf_in, p, l);
+ return;
+ }
+
+ // Are we throttled and a master??
+ if (session[s].tbf_in && config->cluster_iam_master) {
+ // Actually handle the throttled packets.
+ tbf_queue_packet(session[s].tbf_in, p, l);
+ return;
+ }
+
+ // send to ethernet
+ if (tun_write(p, l) < 0)
+ {
+ STAT(tun_tx_errors);
+ LOG(0, s, t, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
+ l, strerror(errno), tunfd, p);
+
return;
}
+ if (session[s].snoop_ip && session[s].snoop_port)
+ {
+ // Snooping this session
+ snoop_send_packet(p + 4, l - 4, session[s].snoop_ip, session[s].snoop_port);
+ }
+
session[s].cin += l - 4;
session[s].total_cin += l - 4;
- sess_count[s].cin += l - 4;
+ sess_local[s].cin += l - 4;
session[s].pin++;
eth_tx += l - 4;
STAT(tun_tx_packets);
- INC_STAT(tun_tx_bytes, l);
+ INC_STAT(tun_tx_bytes, l - 4);
+}
+
+// process IPv6 packet received
+//
+// This MUST be called with at least 4 byte behind 'p'.
+// (i.e. this routine writes to p[-4]).
+void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
+{
+ struct in6_addr ip;
+ in_addr_t ipv4;
+
+ CSTAT(processipv6in);
+
+ LOG_HEX(5, "IPv6", p, l);
+
+ ip = *(struct in6_addr *) (p + 8);
+ ipv4 = ntohl(*(uint32_t *)(p + 16));
+
+ if (l > MAXETHER)
+ {
+ LOG(1, s, t, "IP packet too long %d\n", l);
+ STAT(tunnel_rx_errors);
+ return ;
+ }
+
+ // no spoof
+ if (ipv4 != session[s].ip && memcmp(&config->ipv6_prefix, &ip, 8) && sessionbyipv6(ip) != s)
+ {
+ char str[INET6_ADDRSTRLEN];
+ LOG(5, s, t, "Dropping packet with spoofed IP %s\n",
+ inet_ntop(AF_INET6, &ip, str, INET6_ADDRSTRLEN));
+ return;
+ }
+
+ // Check if it's a Router Solicition message.
+ if (*(p + 6) == 58 && *(p + 7) == 255 && *(p + 24) == 0xFF && *(p + 25) == 2 &&
+ *(uint32_t *)(p + 26) == 0 && *(uint32_t *)(p + 30) == 0 &&
+ *(uint32_t *)(p + 34) == 0 &&
+ *(p + 38) == 0 && *(p + 39) == 2 && *(p + 40) == 133) {
+ LOG(3, s, t, "Got IPv6 RS\n");
+ send_ipv6_ra(t, s, &ip);
+ return;
+ }
- if (session[s].tbf_in && config->cluster_iam_master) { // Are we throttled and a master?? actually handle the throttled packets.
+ // Add on the tun header
+ p -= 4;
+ *(uint32_t *) p = htonl(PKTIPV6);
+ l += 4;
+
+ // Are we throttled and a slave?
+ if (session[s].tbf_in && !config->cluster_iam_master) {
+ // Pass it to the master for handling.
+ master_throttle_packet(session[s].tbf_in, p, l);
+ return;
+ }
+
+ // Are we throttled and a master??
+ if (session[s].tbf_in && config->cluster_iam_master) {
+ // Actually handle the throttled packets.
tbf_queue_packet(session[s].tbf_in, p, l);
return;
}
if (tun_write(p, l) < 0)
{
STAT(tun_tx_errors);
- LOG(0, 0, s, t, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
+ LOG(0, s, t, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
l, strerror(errno), tunfd, p);
+
+ return;
+ }
+
+ if (session[s].snoop_ip && session[s].snoop_port)
+ {
+ // Snooping this session
+ snoop_send_packet(p + 4, l - 4, session[s].snoop_ip, session[s].snoop_port);
}
+ session[s].cin += l - 4;
+ session[s].total_cin += l - 4;
+ sess_local[s].cin += l - 4;
+
+ session[s].pin++;
+ eth_tx += l - 4;
+
+ STAT(tun_tx_packets);
+ INC_STAT(tun_tx_bytes, l - 4);
}
//
// Helper routine for the TBF filters.
// Used to send queued data in from the user.
//
-void send_ipin(sessionidt s, u8 *buf, int len)
+void send_ipin(sessionidt s, uint8_t *buf, int len)
{
LOG_HEX(5, "IP in throttled", buf, len);
+
if (write(tunfd, buf, len) < 0)
{
STAT(tun_tx_errors);
- LOG(0, 0, 0, 0, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
+ LOG(0, 0, 0, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
len, strerror(errno), tunfd, buf);
+
+ return;
+ }
+
+ if (session[s].snoop_ip && session[s].snoop_port)
+ {
+ // Snooping this session
+ snoop_send_packet(buf + 4, len - 4, session[s].snoop_ip, session[s].snoop_port);
}
// Increment packet counters
session[s].cin += len - 4;
session[s].total_cin += len - 4;
- sess_count[s].cin += len - 4;
+ sess_local[s].cin += len - 4;
session[s].pin++;
eth_tx += len - 4;
+
+ STAT(tun_tx_packets);
+ INC_STAT(tun_tx_bytes, len - 4);
}
// Process CCP messages
-void processccp(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
{
+ uint8_t b[MAXCONTROL];
+ uint8_t *q;
- CSTAT(call_processccp);
+ CSTAT(processccp);
LOG_HEX(5, "CCP", p, l);
- if (l < 2 || (*p != ConfigReq && *p != TerminateReq))
- {
- LOG(1, 0, s, t, "Unexpected CCP request code %d\n", *p);
- STAT(tunnel_rx_errors);
- return ;
- }
- // reject
+ switch (l > 1 ? *p : 0)
{
- u8 b[MAXCONTROL];
- u8 *q;
- if (*p == ConfigReq)
+ case ConfigAck:
+ session[s].flags |= SF_CCP_ACKED;
+ return;
+
+ case ConfigReq:
+ if (l < 6) // accept no compression
{
- if (l < 6)
- {
- *p = ConfigAck; // accept no compression
- }
- else
- {
- *p = ConfigRej; // reject
- sendccp(t, s);
- }
+ *p = ConfigAck;
+ break;
}
+
+ // compression requested--reject
+ *p = ConfigRej;
+
+ // send CCP request for no compression for our end if not negotiated
+ if (!(session[s].flags & SF_CCP_ACKED))
+ initccp(t, s);
+
+ break;
+
+ case TerminateReq:
+ *p = TerminateAck;
+ break;
+
+ default:
+ if (l > 1)
+ LOG(1, s, t, "Unexpected CCP request code %d\n", *p);
else
- *p = TerminateAck; // close
- if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP)))
- {
- LOG(1,0,0,0, "Failed to send CCP packet.\n");
- return;
- }
- tunnelsend(b, l + (q - b), t); // send it
+ LOG(1, s, t, "Short CCP packet\n");
+
+ STAT(tunnel_rx_errors);
+ return;
}
+
+ if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP)))
+ return;
+
+ tunnelsend(b, l + (q - b), t); // send it
}
-// send a CHAP PP packet
+// send a CHAP challenge
void sendchap(tunnelidt t, sessionidt s)
{
- u8 b[MAXCONTROL];
- u16 r = session[s].radius;
- u8 *q;
+ uint8_t b[MAXCONTROL];
+ uint16_t r = sess_local[s].radius;
+ uint8_t *q;
- CSTAT(call_sendchap);
+ CSTAT(sendchap);
if (!r)
{
- LOG(1, 0, s, t, "No RADIUS to send challenge\n");
+ LOG(1, s, t, "No RADIUS to send challenge\n");
STAT(tunnel_tx_errors);
- return ;
- }
- LOG(1, 0, s, t, "Send CHAP challenge\n");
- {
- // new challenge
- int n;
- for (n = 0; n < 15; n++)
- radius[r].auth[n] = rand();
+ return;
}
+
+ LOG(1, s, t, "Send CHAP challenge\n");
+
radius[r].chap = 1; // CHAP not PAP
radius[r].id++;
if (radius[r].state != RADIUSCHAP)
radius[r].try = 0;
+
radius[r].state = RADIUSCHAP;
radius[r].retry = backoff(radius[r].try++);
if (radius[r].try > 5)
{
- sessionshutdown(s, "Timeout CHAP");
+ sessionshutdown(s, "CHAP timeout.", 3, 0);
STAT(tunnel_tx_errors);
return ;
}
q = makeppp(b, sizeof(b), 0, 0, t, s, PPPCHAP);
- if (!q) {
- LOG(1, 0, s, t, "failed to send CHAP challenge.\n");
- return;
- }
+ if (!q) return;
+
*q = 1; // challenge
q[1] = radius[r].id; // ID
- q[4] = 16; // length
+ q[4] = 16; // value size (size of challenge)
memcpy(q + 5, radius[r].auth, 16); // challenge
strcpy(q + 21, hostname); // our name
- *(u16 *) (q + 2) = htons(strlen(hostname) + 21); // length
+ *(uint16_t *) (q + 2) = htons(strlen(hostname) + 21); // length
tunnelsend(b, strlen(hostname) + 21 + (q - b), t); // send it
}
// fill in a L2TP message with a PPP frame,
// copies existing PPP message and changes magic number if seen
// returns start of PPP frame
-u8 *makeppp(u8 *b, int size, u8 *p, int l, tunnelidt t, sessionidt s, u16 mtype)
+uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype)
{
- if (size < 12)
- return NULL; // Need more space than this!!
+ if (size < 12) // Need more space than this!!
+ {
+ static int backtrace_count = 0;
+ LOG(0, s, t, "makeppp buffer too small for L2TP header (size=%d)\n", size);
+ log_backtrace(backtrace_count, 5)
+ return NULL;
+ }
- *(u16 *) (b + 0) = htons(0x0002); // L2TP with no options
- *(u16 *) (b + 2) = htons(tunnel[t].far); // tunnel
- *(u16 *) (b + 4) = htons(session[s].far); // session
+ *(uint16_t *) (b + 0) = htons(0x0002); // L2TP with no options
+ *(uint16_t *) (b + 2) = htons(tunnel[t].far); // tunnel
+ *(uint16_t *) (b + 4) = htons(session[s].far); // session
b += 6;
if (mtype == PPPLCP || !(session[s].l2tp_flags & SESSIONACFC))
{
- *(u16 *) b = htons(0xFF03); // HDLC header
+ *(uint16_t *) b = htons(0xFF03); // HDLC header
b += 2;
}
if (mtype < 0x100 && session[s].l2tp_flags & SESSIONPFC)
*b++ = mtype;
else
{
- *(u16 *) b = htons(mtype);
+ *(uint16_t *) b = htons(mtype);
b += 2;
}
- if (l + 12 > size) {
- LOG(3,0,0,0, "Would have overflowed the buffer in makeppp: size %d, len %d.\n", size, l);
- return NULL; // Run out of room to hold the packet!
+ if (l + 12 > size)
+ {
+ static int backtrace_count = 0;
+ LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%d)\n", size, l + 12);
+ log_backtrace(backtrace_count, 5)
+ return NULL;
}
+
if (p && l)
memcpy(b, p, l);
+
return b;
}
-// find a PPP option, returns point to option, or 0 if not found
-u8 *findppp(u8 *b, u8 mtype)
+static uint8_t *add_lcp_auth(uint8_t *b, int size, int authtype)
{
- u16 l = ntohs(*(u16 *) (b + 2));
- if (l < 4)
+ if ((authtype == AUTHCHAP && size < 5) || size < 4)
return 0;
- b += 4;
- l -= 4;
- while (l)
+
+ *b++ = 3; // Authentication-Protocol
+ if (authtype == AUTHCHAP)
{
- if (l < b[1] || !b[1])
- return 0; // faulty
- if (*b == mtype)
- return b;
- l -= b[1];
- b += b[1];
+ *b++ = 5; // length
+ *(uint16_t *) b = htons(PPPCHAP); b += 2;
+ *b++ = 5; // MD5
}
- return 0;
+ else if (authtype == AUTHPAP)
+ {
+ *b++ = 4; // length
+ *(uint16_t *) b = htons(PPPPAP); b += 2;
+ }
+ else
+ {
+ LOG(0, 0, 0, "add_lcp_auth called with unsupported auth type %d\n", authtype);
+ }
+
+ return b;
}
-// Send initial LCP ConfigReq
-void initlcp(tunnelidt t, sessionidt s)
+// Send initial LCP ConfigReq for MRU, authentication type and magic no
+void sendlcp(tunnelidt t, sessionidt s, int authtype)
{
- char b[500] = {0}, *q;
+ char b[500], *q, *l;
- q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP);
- if (!q) {
- LOG(1, 0, s, t, "Failed to send LCP ConfigReq.\n");
+ if (!(q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP)))
return;
- }
- LOG(4, 0, s, t, "Sending LCP ConfigReq for PAP\n");
- *q = ConfigReq;
- *(u8 *)(q + 1) = (time_now % 255) + 1; // ID
- *(u16 *)(q + 2) = htons(14); // Length
- *(u8 *)(q + 4) = 5;
- *(u8 *)(q + 5) = 6;
- *(u32 *)(q + 6) = htonl(session[s].magic);
- *(u8 *)(q + 10) = 3;
- *(u8 *)(q + 11) = 4;
- *(u16 *)(q + 12) = htons(PPPPAP); // PAP
- tunnelsend(b, 12 + 14, t);
+
+ LOG(4, s, t, "Sending LCP ConfigReq for %s\n",
+ authtype == AUTHCHAP ? "CHAP" : "PAP");
+
+ if (!session[s].mru)
+ session[s].mru = DEFAULT_MRU;
+
+ l = q;
+ *l++ = ConfigReq;
+ *l++ = (time_now % 255) + 1; // ID
+
+ l += 2; //Save space for length
+
+ *l++ = 1; *l++ = 4; // Maximum-Receive-Unit (length 4)
+ *(uint16_t *) l = htons(session[s].mru); l += 2;
+
+ l = add_lcp_auth(l, sizeof(b) - (l - b), authtype);
+
+ *l++ = 5; *l++ = 6; // Magic-Number (length 6)
+ *(uint32_t *) l = htonl(session[s].magic);
+ l += 4;
+
+ *(uint16_t *)(q + 2) = htons(l - q); // Length
+
+ LOG_HEX(5, "PPPLCP", q, l - q);
+ tunnelsend(b, (l - b), t);
}
-// Send CCP reply
-void sendccp(tunnelidt t, sessionidt s)
+// Send CCP request for no compression
+static void initccp(tunnelidt t, sessionidt s)
{
- char *q, b[500] = {0};
+ char b[500], *q;
+
+ if (!(q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPCCP)))
+ return;
- q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPCCP);
+ LOG(4, s, t, "Sending CCP ConfigReq for no compression\n");
*q = ConfigReq;
- *(u8 *)(q + 1) = (time_now % 255) + 1; // ID
- *(u16 *)(q + 2) = htons(4); // Length
+ *(uint8_t *)(q + 1) = (time_now % 255) + 1; // ID
+ *(uint16_t *)(q + 2) = htons(4); // Length
+
LOG_HEX(5, "PPPCCP", q, 4);
tunnelsend(b, (q - b) + 4 , t);
}
-
projects / l2tpns.git / blobdiff