// Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
// vim: sw=8 ts=8
-char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.164 2006/04/27 14:37:27 bodea Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.161.2.1 2006/06/22 15:30:50 bodea Exp $";
#include <arpa/inet.h>
#include <assert.h>
CONFIG("radius_authtypes", radius_authtypes_s, STRING),
CONFIG("radius_dae_port", radius_dae_port, SHORT),
CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
- CONFIG("guest_account", guest_user, STRING),
CONFIG("bind_address", bind_address, IPv4),
CONFIG("peer_address", peer_address, IPv4),
CONFIG("send_garp", send_garp, BOOL),
CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
CONFIG("throttle_buckets", num_tbfs, INT),
CONFIG("accounting_dir", accounting_dir, STRING),
+ CONFIG("setuid", target_uid, INT),
CONFIG("dump_speed", dump_speed, BOOL),
CONFIG("multi_read_count", multi_read_count, INT),
CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
static sessionidt shut_acct_n = 0;
tunnelt *tunnel = NULL; // Array of tunnel structures.
-bundlet *bundle = NULL; // Array of bundle structures.
-fragmentationt *frag = NULL; // Array of fragmentation structures.
sessiont *session = NULL; // Array of session structures.
sessionlocalt *sess_local = NULL; // Array of local per-session counters.
radiust *radius = NULL; // Array of radius structures.
static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
static tunnelidt new_tunnel(void);
static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
-static void bundleclear(bundleidt b);
// on slaves, alow BGP to withdraw cleanly before exiting
#define QUIT_DELAY 5
*(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
}
-void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
-{
- uint16_t proto;
- if (extra) {
- // Skip the four extra bytes
- p += 4;
- l -= 4;
- }
-
- // Process this frame
- if (*p & 1)
- {
- proto = *p++;
- l--;
- }
- else
- {
- proto = ntohs(*(uint16_t *) p);
- p += 2;
- l -= 2;
- }
- if (proto == PPPIP)
- {
- if (session[s].die)
- {
- LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
- return; // closing session, PPP not processed
- }
- session[s].last_packet = time_now;
- processipin(s, t, p, l);
- }
- else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
- {
- if (session[s].die)
- {
- LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
- return; // closing session, PPP not processed
- }
-
- session[s].last_packet = time_now;
- processipv6in(s, t, p, l);
- }
- else
- {
- LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
- }
-}
-
// process outgoing (to tunnel) IP
//
static void processipout(uint8_t *buf, int len)
uint8_t *data = buf; // Keep a copy of the originals.
int size = len;
- uint8_t b1[MAXETHER + 20];
- uint8_t b2[MAXETHER + 20];
+ uint8_t b[MAXETHER + 20];
CSTAT(processipout);
return;
}
+ LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
+
// Add on L2TP header
{
- bundleidt bid = 0;
- if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
- {
- bid = session[s].bundle;
- s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
- LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
- if (len > 256)
- {
- // Partition the packet to 2 fragments
- uint32_t frag1len = len / 2;
- uint32_t frag2len = len - frag1len;
- uint8_t *p = makeppp(b1, sizeof(b1), buf, frag1len, s, t, PPPIP, 0, bid, MP_BEGIN);
- uint8_t *q;
-
- if (!p) return;
- tunnelsend(b1, frag1len + (p-b1), t); // send it...
- s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
- LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
- q = makeppp(b2, sizeof(b2), buf+frag1len, frag2len, s, t, PPPIP, 0, bid, MP_END);
- if (!q) return;
- tunnelsend(b2, frag2len + (q-b2), t); // send it...
- }
- else {
- // Send it as one frame
- uint8_t *p = makeppp(b1, sizeof(b1), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
- if (!p) return;
- tunnelsend(b1, len + (p-b1), t); // send it...
- }
- }
- else
- {
- uint8_t *p = makeppp(b1, sizeof(b1), buf, len, s, t, PPPIP, 0, 0, 0);
- if (!p) return;
- tunnelsend(b1, len + (p-b1), t); // send it...
- }
+ uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP);
+ if (!p) return;
+ tunnelsend(b, len + (p-b), t); // send it...
}
// Snooping this session, send it to intercept box
}
return;
}
- if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
- {
- bundleidt bid = session[s].bundle;
- s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
- LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %d\n", s);
- }
t = session[s].tunnel;
sp = &session[s];
// Add on L2TP header
{
- uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
+ uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6);
if (!p) return;
tunnelsend(b, len + (p-b), t); // send it...
}
// Add on L2TP header
{
- uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
+ uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP);
if (!p) return;
tunnelsend(b, len + (p-b), t); // send it...
}
session[s].unique_id = last_id;
}
- q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
+ q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP);
if (!q) return;
*q = ConfigReq;
CSTAT(sendipv6cp);
LOG(3, s, t, "IPV6CP: send ConfigReq\n");
- q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
+ q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP);
if (!q) return;
*q = ConfigReq;
// kill a session now
void sessionkill(sessionidt s, char *reason)
{
- bundleidt b;
CSTAT(sessionkill);
radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
- if ((b = session[s].bundle))
- {
- // This session was part of a bundle
- bundle[b].num_of_links--;
- LOG(3, s, 0, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
- if (bundle[b].num_of_links == 0)
- {
- bundleclear(b);
- LOG(3, s, 0, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
- }
- else
- {
- // Adjust the members array to accomodate the new change
- uint8_t mem_num = 0;
- // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
- if (bundle[b].members[bundle[b].num_of_links] != s)
- {
- uint8_t ml;
- for (ml = 0; ml<bundle[b].num_of_links; ml++)
- {
- if (bundle[b].members[ml] == s)
- {
- mem_num = ml;
- break;
- }
- }
- bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
- LOG(3, s, 0, "MPPP: Adjusted member links array\n");
- }
- }
- cluster_send_bundle(b);
- }
sessionclear(s);
cluster_send_session(s);
}
tunnel[t].state = TUNNELFREE;
}
-static void bundleclear(bundleidt b)
-{
- if (!b) return;
- memset(&bundle[b], 0, sizeof(bundle[b]));
- bundle[b].state = BUNDLEFREE;
-}
-
// kill a tunnel now
static void tunnelkill(tunnelidt t, char *reason)
{
int error = 0;
char *msg = 0;
- // default disconnect cause/message on receipt
- // of CDN (set to more specific value from
- // attribute 46 if present below).
+ // Default disconnect cause/message on receipt of CDN. Set to
+ // more specific value from attribute 1 (result code) or 46
+ // (disconnect cause) if present below.
+ int disc_cause_set = 0;
int disc_cause = TERM_NAS_REQUEST;
char const *disc_reason = "Closed (Received CDN).";
case 1: // result code
{
uint16_t rescode = ntohs(*(uint16_t *) b);
- const char* resdesc = "(unknown)";
+ char const *resdesc = "(unknown)";
+ char const *errdesc = NULL;
+ int cause = 0;
+
if (message == 4)
{ /* StopCCN */
resdesc = l2tp_stopccn_result_code(rescode);
+ cause = TERM_LOST_SERVICE;
}
else if (message == 14)
{ /* CDN */
resdesc = l2tp_cdn_result_code(rescode);
+ if (rescode == 1)
+ cause = TERM_LOST_CARRIER;
+ else
+ cause = TERM_ADMIN_RESET;
}
LOG(4, s, t, " Result Code %d: %s\n", rescode, resdesc);
if (n >= 4)
{
uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
- LOG(4, s, t, " Error Code %d: %s\n", errcode, l2tp_error_code(errcode));
+ errdesc = l2tp_error_code(errcode);
+ LOG(4, s, t, " Error Code %d: %s\n", errcode, errdesc);
}
if (n > 4)
LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
+ if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
+ {
+ disc_cause_set = mtype;
+ disc_reason = errdesc ? errdesc : resdesc;
+ disc_cause = cause;
+ }
+
break;
}
break;
"(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
code, proto, dir, n - 5, b + 5);
+ disc_cause_set = mtype;
+
switch (code)
{
case 1: // admin disconnect
// start LCP
sess_local[s].lcp_authtype = config->radius_authprefer;
sess_local[s].ppp_mru = MRU;
-
- // Set multilink options before sending initial LCP packet
- sess_local[s].mp_mrru = 1614;
- sess_local[s].mp_epdis = config->bind_address ? config->bind_address : my_address;
-
sendlcp(s, t);
change_state(s, lcp, RequestSent);
break;
processipin(s, t, p, l);
}
- else if (proto == PPPMP)
- {
- if (session[s].die)
- {
- LOG(4, s, t, "Session %d is closing. Don't process PPP packets\n", s);
- return; // closing session, PPP not processed
- }
-
- session[s].last_packet = time_now;
- if (session[s].walled_garden && !config->cluster_iam_master)
- {
- master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
- return;
- }
-
- processmpin(s, t, p, l);
- }
else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
{
if (session[s].die)
continue;
}
- // check for timed out sessions
- if (session[s].timeout)
- {
- bundleidt bid = session[s].bundle;
- if (bid)
- {
- clockt curr_time = time_now;
- if (curr_time - bundle[bid].last_check >= 1)
- {
- bundle[bid].online_time += (curr_time-bundle[bid].last_check)*bundle[bid].num_of_links;
- bundle[bid].last_check = curr_time;
- if (bundle[bid].online_time >= session[s].timeout)
- {
- int ses;
- for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
- {
- sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
- s_actions++;
- continue;
- }
- }
- }
- }
- else if (session[s].timeout <= time_now - session[s].opened)
- {
- sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
- s_actions++;
- continue;
- }
- }
-
// PPP timeouts
if (sess_local[s].lcp.restart <= time_now)
{
{
uint8_t b[MAXETHER];
- uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
+ uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP);
if (!q) continue;
*q = EchoReq;
e.events = EPOLLIN;
i = 0;
- if (clifd >= 0)
- {
- d[i].type = FD_TYPE_CLI;
- e.data.ptr = &d[i++];
- epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
- }
+ d[i].type = FD_TYPE_CLI;
+ e.data.ptr = &d[i++];
+ epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
d[i].type = FD_TYPE_CLUSTER;
e.data.ptr = &d[i++];
LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
exit(1);
}
- if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
- {
- LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
- exit(1);
- }
- if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
- {
- LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
- exit(1);
- }
if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
{
LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
- memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
memset(session, 0, sizeof(sessiont) * MAXSESSION);
memset(radius, 0, sizeof(radiust) * MAXRADIUS);
memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
for (i = 1; i < MAXTUNNEL; i++)
tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
- for (i = 1; i < MAXBUNDLE; i++) {
- bundle[i].state = BUNDLEUNDEF;
- }
-
if (!*hostname)
{
// Grab my hostname unless it's been specified
LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
}
+ // Drop privileges here
+ if (config->target_uid > 0 && geteuid() == 0)
+ setuid(config->target_uid);
+
mainloop();
/* remove plugins (so cleanup code gets run) */
// Make sure this is right
session[s].tunnel = t;
- // Join a bundle if the MRRU option is accepted
- if (session[s].mrru > 0 && !session[s].bundle)
- {
- LOG(3, s, t, "This session can be part of multilink bundle\n");
- if (join_bundle(s))
- cluster_send_bundle(session[s].bundle);
- }
-
// zap old sessions with same IP and/or username
// Don't kill gardened sessions - doing so leads to a DoS
// from someone who doesn't need to know the password
continue;
}
- if (config->allow_duplicate_users)
- continue;
-
- if (session[s].walled_garden || session[i].walled_garden)
- continue;
-
- // Allow duplicate sessions for guest account.
- if (*config->guest_user && !strcasecmp(user, config->guest_user))
- continue;
-
- // Allow duplicate sessions for multilink ones of the same bundle.
- if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle)
- continue;
-
- // Drop the new session in case of duplicate sessionss, not the old one.
+ if (config->allow_duplicate_users) continue;
+ if (session[s].walled_garden || session[i].walled_garden) continue;
if (!strcasecmp(user, session[i].user))
sessionkill(i, "Duplicate session for users");
}
projects / l2tpns.git / blobdiff