X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/b830a899ca4587707123482c5dbb8c14edb8fd9c..f22a9cebbe6a3a99c6c5bd5e9fd410274a8562b9:/l2tpns.c diff --git a/l2tpns.c b/l2tpns.c index b0b51a2..af21f2f 100644 --- a/l2tpns.c +++ b/l2tpns.c @@ -4,7 +4,7 @@ // 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 1.108 2005-06-04 15:42:35 bodea Exp $"; +char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.119 2005-08-10 11:25:56 bodea Exp $"; #include #include @@ -60,6 +60,7 @@ int tunfd = -1; // tun interface file handle. (network device) int udpfd = -1; // UDP file handle int controlfd = -1; // Control signal handle int clifd = -1; // Socket listening for CLI connections. +int daefd = -1; // Socket listening for DAE connections. int snoopfd = -1; // UDP file handle for sending out intercept data int *radfds = NULL; // RADIUS requests file handles int ifrfd = -1; // File descriptor for routing, etc @@ -104,6 +105,9 @@ config_descriptt config_values[] = { CONFIG("pid_file", pid_file, STRING), CONFIG("random_device", random_device, STRING), CONFIG("l2tp_secret", l2tpsecret, STRING), + CONFIG("ppp_restart_time", ppp_restart_time, INT), + CONFIG("ppp_max_configure", ppp_max_configure, INT), + CONFIG("ppp_max_failure", ppp_max_failure, INT), CONFIG("primary_dns", default_dns1, IPv4), CONFIG("secondary_dns", default_dns2, IPv4), CONFIG("primary_radius", radiusserver[0], IPv4), @@ -114,6 +118,7 @@ config_descriptt config_values[] = { CONFIG("radius_interim", radius_interim, INT), CONFIG("radius_secret", radiussecret, STRING), CONFIG("radius_authtypes", radius_authtypes_s, STRING), + CONFIG("radius_dae_port", radius_dae_port, SHORT), CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL), CONFIG("bind_address", bind_address, IPv4), CONFIG("peer_address", peer_address, IPv4), @@ -148,6 +153,7 @@ static char *plugin_functions[] = { "plugin_kill_session", "plugin_control", "plugin_radius_response", + "plugin_radius_reset", "plugin_become_master", "plugin_new_session_master", }; @@ -163,7 +169,7 @@ sessiont *session = NULL; // Array of session structures. sessionlocalt *sess_local = NULL; // Array of local per-session counters. radiust *radius = NULL; // Array of radius structures. ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses. -ip_filtert *ip_filters = NULL; // Array of named filters. +ip_filtert *ip_filters = NULL; // Array of named filters. static controlt *controlfree = 0; struct Tstats *_statistics = NULL; #ifdef RINGBUFFER @@ -177,10 +183,9 @@ static void free_ip_address(sessionidt s); static void dump_acct_info(int all); static void sighup_handler(int sig); static void sigalrm_handler(int sig); -static void sigterm_handler(int sig); -static void sigquit_handler(int sig); +static void shutdown_handler(int sig); static void sigchild_handler(int sig); -static void build_chap_response(char *challenge, uint8_t id, uint16_t challenge_length, char **challenge_response); +static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response); static void update_config(void); static void read_config_file(void); static void initplugins(void); @@ -194,6 +199,10 @@ static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vec // on slaves, alow BGP to withdraw cleanly before exiting #define QUIT_DELAY 5 +// quit actions (master) +#define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover) +#define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections + // return internal time (10ths since process startup), set f if given static clockt now(double *f) { @@ -252,10 +261,10 @@ void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) va_end(ap); } -void _log_hex(int level, const char *title, const char *data, int maxsize) +void _log_hex(int level, const char *title, const uint8_t *data, int maxsize) { int i, j; - const uint8_t *d = (const uint8_t *) data; + const uint8_t *d = data; if (config->debug < level) return; @@ -323,7 +332,8 @@ static void initrandom(char *source) return; // close previous source, if any - if (rand_fd >= 0) close(rand_fd); + if (rand_fd >= 0) + close(rand_fd); rand_fd = -1; @@ -340,13 +350,6 @@ static void initrandom(char *source) path, strerror(errno)); } } - - // no source: seed prng - { - unsigned seed = time_now ^ getpid(); - LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed); - srand(seed); - } } // fill buffer with random data @@ -367,7 +370,7 @@ void random_data(uint8_t *buf, int len) strerror(errno)); // fall back to rand() - initrandom(0); + initrandom(NULL); } n = 0; @@ -551,7 +554,7 @@ static void inittun(void) tunidx = ifr.ifr_ifindex; // Only setup IPv6 on the tun device if we have a configured prefix - if (config->ipv6_prefix.s6_addr[0] > 0) { + if (config->ipv6_prefix.s6_addr[0]) { ifr6fd = socket(PF_INET6, SOCK_DGRAM, 0); // Link local address is FE80::1 @@ -581,7 +584,7 @@ static void inittun(void) } } -// set up UDP port +// set up UDP ports static void initudp(void) { int on = 1; @@ -603,7 +606,6 @@ static void initudp(void) LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno)); exit(1); } - snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); // Control memset(&addr, 0, sizeof(addr)); @@ -616,6 +618,21 @@ static void initudp(void) LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno)); exit(1); } + + // Dynamic Authorization Extensions to RADIUS + memset(&addr, 0, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_port = htons(config->radius_dae_port); + daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); + setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); + if (bind(daefd, (void *) &addr, sizeof(addr)) < 0) + { + LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno)); + exit(1); + } + + // Intercept + snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); } // @@ -688,8 +705,11 @@ sessionidt sessionbyipv6(struct in6_addr ip) CSTAT(sessionbyipv6); if (!memcmp(&config->ipv6_prefix, &ip, 8) || - (ip.s6_addr[0] == 0xFE && ip.s6_addr[1] == 0x80 && - (ip.s6_addr16[1] == ip.s6_addr16[2] == ip.s6_addr16[3] == 0))) { + (ip.s6_addr[0] == 0xFE && + ip.s6_addr[1] == 0x80 && + ip.s6_addr16[1] == 0 && + ip.s6_addr16[2] == 0 && + ip.s6_addr16[3] == 0)) { s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]); } else { s = lookup_ipv6map(ip); @@ -959,14 +979,14 @@ int tun_write(uint8_t * data, int size) // process outgoing (to tunnel) IP // -static void processipout(uint8_t * buf, int len) +static void processipout(uint8_t *buf, int len) { sessionidt s; sessiont *sp; tunnelidt t; in_addr_t ip; - char *data = buf; // Keep a copy of the originals. + uint8_t *data = buf; // Keep a copy of the originals. int size = len; uint8_t b[MAXETHER + 20]; @@ -1084,7 +1104,7 @@ static void processipout(uint8_t * buf, int len) // Add on L2TP header { - uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP); + uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP); if (!p) return; tunnelsend(b, len + (p-b), t); // send it... } @@ -1112,7 +1132,7 @@ static void processipv6out(uint8_t * buf, int len) in_addr_t ip; struct in6_addr ip6; - char *data = buf; // Keep a copy of the originals. + uint8_t *data = buf; // Keep a copy of the originals. int size = len; uint8_t b[MAXETHER + 20]; @@ -1195,7 +1215,7 @@ static void processipv6out(uint8_t * buf, int len) // Add on L2TP header { - uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIPV6); + uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6); if (!p) return; tunnelsend(b, len + (p-b), t); // send it... } @@ -1247,7 +1267,7 @@ static void send_ipout(sessionidt s, uint8_t *buf, int len) // Add on L2TP header { - uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP); + uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP); if (!p) return; tunnelsend(b, len + (p-b), t); // send it... } @@ -1299,7 +1319,7 @@ static void controls(controlt * c, uint16_t avp, char *val, uint8_t m) } // add a binary AVP -static void controlb(controlt * c, uint16_t avp, char *val, unsigned int len, uint8_t m) +static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m) { uint16_t l = ((m ? 0x8000 : 0) + len + 6); *(uint16_t *) (c->buf + c->length + 0) = htons(l); @@ -1346,7 +1366,7 @@ static void controlnull(tunnelidt t) } // add a control message to a tunnel, and send if within window -static void controladd(controlt * c, tunnelidt t, sessionidt far) +static void controladd(controlt *c, sessionidt far, tunnelidt t) { *(uint16_t *) (c->buf + 2) = htons(c->length); // length *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel @@ -1418,7 +1438,7 @@ void throttle_session(sessionidt s, int rate_in, int rate_out) } // add/remove filters from session (-1 = no change) -static void filter_session(sessionidt s, int filter_in, int filter_out) +void filter_session(sessionidt s, int filter_in, int filter_out) { if (!session[s].opened) return; // No-one home. @@ -1479,10 +1499,7 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error) if (session[s].ip && !walled_garden && !session[s].die) { // RADIUS Stop message - uint16_t r = sess_local[s].radius; - if (!r) - r = radiusnew(s); - + uint16_t r = radiusnew(s); if (r) { // stop, if not already trying @@ -1520,7 +1537,7 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error) free_ip_address(s); // unroute IPv6, if setup - if (session[s].flags & SF_IPV6_ROUTED) + if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen) route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0); } @@ -1532,7 +1549,7 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error) controlt *c = controlnew(14); // sending CDN if (error) { - char buf[4]; + uint8_t buf[4]; *(uint16_t *) buf = htons(result); *(uint16_t *) (buf+2) = htons(error); controlb(c, 1, buf, 4, 1); @@ -1541,7 +1558,7 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error) control16(c, 1, result, 1); control16(c, 14, s, 1); // assigned session (our end) - controladd(c, session[s].tunnel, session[s].far); // send the message + controladd(c, session[s].far, session[s].tunnel); // send the message } if (!session[s].die) @@ -1551,78 +1568,66 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error) if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--; if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--; + // clear PPP state + memset(&session[s].ppp, 0, sizeof(session[s].ppp)); + sess_local[s].lcp.restart = 0; + sess_local[s].ipcp.restart = 0; + sess_local[s].ipv6cp.restart = 0; + sess_local[s].ccp.restart = 0; + cluster_send_session(s); } -void sendipcp(tunnelidt t, sessionidt s) +void sendipcp(sessionidt s, tunnelidt t) { uint8_t buf[MAXCONTROL]; - uint16_t r = sess_local[s].radius; uint8_t *q; CSTAT(sendipcp); - if (!r) - r = radiusnew(s); - - if (!r) - { - sessionshutdown(s, "No free RADIUS sessions for IPCP", 3, 0); - return; - } - - if (radius[r].state != RADIUSIPCP) - { - radius[r].state = RADIUSIPCP; - radius[r].try = 0; - } - - radius[r].retry = backoff(radius[r].try++); - if (radius[r].try > 10) + if (!session[s].unique_id) { - radiusclear(r, s); // Clear radius session. - sessionshutdown(s, "No reply to IPCP.", 3, 0); - return; + if (!++last_id) ++last_id; // skip zero + session[s].unique_id = last_id; } - q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPCP); + q = makeppp(buf,sizeof(buf), 0, 0, s, t, PPPIPCP); if (!q) return; *q = ConfigReq; - q[1] = r >> RADIUS_SHIFT; // ID, dont care, we only send one type of request - *(uint16_t *) (q + 2) = htons(10); - q[4] = 3; - q[5] = 6; + q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request + *(uint16_t *) (q + 2) = htons(10); // packet length + q[4] = 3; // ip address option + q[5] = 6; // option length *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address : config->bind_address ? config->bind_address : my_address; // send my IP tunnelsend(buf, 10 + (q - buf), t); // send it - session[s].flags &= ~SF_IPCP_ACKED; // Clear flag. - - // If we have an IPv6 prefix length configured, assume we should - // try to negotiate an IPv6 session as well. Unless we've had a - // (N)ACK for IPV6CP. - if (config->ipv6_prefix.s6_addr[0] > 0 && - !(session[s].flags & SF_IPV6CP_ACKED) && - !(session[s].flags & SF_IPV6_NACKED)) - { - q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPV6CP); - if (!q) return; - - *q = ConfigReq; - q[1] = r >> RADIUS_SHIFT; // ID, don't care, we - // only send one type - // of request - *(uint16_t *) (q + 2) = htons(14); - q[4] = 1; - q[5] = 10; - *(uint32_t *) (q + 6) = 0; // We'll be prefix::1 - *(uint32_t *) (q + 10) = 0; - q[13] = 1; - - tunnelsend(buf, 14 + (q - buf), t); // send it - } +} + +void sendipv6cp(sessionidt s, tunnelidt t) +{ + uint8_t buf[MAXCONTROL]; + uint8_t *q; + + CSTAT(sendipv6cp); + + q = makeppp(buf,sizeof(buf), 0, 0, s, t, PPPIPV6CP); + if (!q) return; + + *q = ConfigReq; + q[1] = session[s].unique_id & 0xf; // ID, don't care, we + // only send one type + // of request + *(uint16_t *) (q + 2) = htons(14); + q[4] = 1; // interface identifier option + q[5] = 10; // option length + *(uint32_t *) (q + 6) = 0; // We'll be prefix::1 + *(uint32_t *) (q + 10) = 0; + q[13] = 1; + + tunnelsend(buf, 14 + (q - buf), t); // send it } static void sessionclear(sessionidt s) @@ -1717,7 +1722,7 @@ static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, cha // close session for (s = 1; s <= config->cluster_highest_sessionid ; ++s) if (session[s].tunnel == t) - sessionshutdown(s, reason, 3, 0); + sessionshutdown(s, reason, 0, 0); tunnel[t].state = TUNNELDIE; tunnel[t].die = TIME + 700; // Clean up in 70 seconds @@ -1728,7 +1733,7 @@ static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, cha controlt *c = controlnew(4); // sending StopCCN if (error) { - char buf[64]; + uint8_t buf[64]; int l = 4; *(uint16_t *) buf = htons(result); *(uint16_t *) (buf+2) = htons(error); @@ -1748,14 +1753,14 @@ static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, cha control16(c, 1, result, 1); control16(c, 9, t, 1); // assigned tunnel (our end) - controladd(c, t, 0); // send the message + controladd(c, 0, t); // send the message } } // read and process packet on tunnel (UDP) -void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) +void processudp(uint8_t *buf, int len, struct sockaddr_in *addr) { - char *chapresponse = NULL; + uint8_t *chapresponse = NULL; uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0; uint8_t *p = buf + 2; @@ -2027,8 +2032,6 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) continue; } - LOG(4, s, t, "Hidden AVP\n"); - // Unhide the AVP unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length); @@ -2049,13 +2052,15 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) n = orig_len; } - LOG(4, s, t, " AVP %d (%s) len %d\n", mtype, avp_name(mtype), n); + LOG(4, s, t, " AVP %d (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n, + flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : ""); + switch (mtype) { case 0: // message type message = ntohs(*(uint16_t *) b); mandatory = flags & 0x80; - LOG(4, s, t, " Message type = %d (%s)\n", *b, l2tp_message_type(message)); + LOG(4, s, t, " Message type = %d (%s)\n", *b, l2tp_code(message)); break; case 1: // result code { @@ -2063,18 +2068,18 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) const char* resdesc = "(unknown)"; if (message == 4) { /* StopCCN */ - resdesc = stopccn_result_code(rescode); + resdesc = l2tp_stopccn_result_code(rescode); } else if (message == 14) { /* CDN */ - resdesc = cdn_result_code(rescode); + resdesc = l2tp_cdn_result_code(rescode); } 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, error_code(errcode)); + LOG(4, s, t, " Error Code %d: %s\n", errcode, l2tp_error_code(errcode)); } if (n > 4) LOG(4, s, t, " Error String: %.*s\n", n-4, b+4); @@ -2208,7 +2213,7 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) case 29: // Proxy Authentication Type { uint16_t atype = ntohs(*(uint16_t *)b); - LOG(4, s, t, " Proxy Auth Type %d (%s)\n", atype, auth_type(atype)); + LOG(4, s, t, " Proxy Auth Type %d (%s)\n", atype, ppp_auth_type(atype)); if (atype == 2) authtype = AUTHCHAP; else if (atype == 3) @@ -2228,16 +2233,12 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) case 31: // Proxy Authentication Challenge { LOG(4, s, t, " Proxy Auth Challenge\n"); - if (sess_local[s].radius) - memcpy(radius[sess_local[s].radius].auth, b, 16); break; } case 32: // Proxy Authentication ID { uint16_t authid = ntohs(*(uint16_t *)(b)); LOG(4, s, t, " Proxy Auth ID (%d)\n", authid); - if (sess_local[s].radius) - radius[sess_local[s].radius].id = authid; break; } case 33: // Proxy Authentication Response @@ -2271,6 +2272,8 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) case 36: // Random Vector LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n"); memset(session[s].random_vector, 0, sizeof(session[s].random_vector)); + if (n > sizeof(session[s].random_vector)) + n = sizeof(session[s].random_vector); memcpy(session[s].random_vector, b, n); session[s].random_vector_length = n; break; @@ -2293,6 +2296,8 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) switch (message) { case 1: // SCCRQ - Start Control Connection Request + tunnel[t].state = TUNNELOPENING; + if (main_quit != QUIT_SHUTDOWN) { controlt *c = controlnew(2); // sending SCCRP control16(c, 2, version, 1); // protocol version @@ -2300,9 +2305,12 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) controls(c, 7, tunnel[t].hostname, 1); // host name (TBA) if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response control16(c, 9, t, 1); // assigned tunnel - controladd(c, t, 0); // send the resply + controladd(c, 0, t); // send the resply + } + else + { + tunnelshutdown(t, "Shutting down", 6, 0, 0); } - tunnel[t].state = TUNNELOPENING; break; case 2: // SCCRP tunnel[t].state = TUNNELOPEN; @@ -2328,9 +2336,9 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) // TBA break; case 10: // ICRQ - if (sessionfree) + if (sessionfree && main_quit != QUIT_SHUTDOWN) { - uint16_t r; + controlt *c = controlnew(11); // ICRP s = sessionfree; sessionfree = session[s].next; @@ -2339,39 +2347,36 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) if (s > config->cluster_highest_sessionid) config->cluster_highest_sessionid = s; - // make a RADIUS session - if ((r = radiusnew(s))) - { - controlt *c = controlnew(11); // sending ICRP - session[s].opened = time_now; - session[s].tunnel = t; - session[s].far = asession; - session[s].last_packet = time_now; - LOG(3, s, t, "New session (%d/%d)\n", tunnel[t].far, session[s].far); - control16(c, 14, s, 1); // assigned session - controladd(c, t, asession); // send the reply - - strncpy(radius[r].calling, calling, sizeof(radius[r].calling) - 1); - strncpy(session[s].called, called, sizeof(session[s].called) - 1); - strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1); - STAT(session_created); - break; - } + session[s].opened = time_now; + session[s].tunnel = t; + session[s].far = asession; + session[s].last_packet = time_now; + LOG(3, s, t, "New session (%d/%d)\n", tunnel[t].far, session[s].far); + control16(c, 14, s, 1); // assigned session + controladd(c, asession, t); // send the reply + strncpy(session[s].called, called, sizeof(session[s].called) - 1); + strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1); - LOG(1, s, t, "No free RADIUS sessions for ICRQ\n"); - sessionclear(s); - } - else - { - STAT(session_overflow); - LOG(1, 0, t, "No free sessions\n"); + session[s].ppp.phase = Establish; + session[s].ppp.lcp = Starting; + + STAT(session_created); + break; } { controlt *c = controlnew(14); // CDN - control16(c, 1, 4, 1); // temporary lack of resources - controladd(c, session[s].tunnel, asession); // send the message + if (!sessionfree) + { + STAT(session_overflow); + LOG(1, 0, t, "No free sessions\n"); + control16(c, 1, 4, 0); // temporary lack of resources + } + else + control16(c, 1, 2, 7); // shutting down, try another + + controladd(c, asession, t); // send the message } return; case 11: // ICRP @@ -2383,12 +2388,19 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) session[s].l2tp_flags = aflags; // set flags received LOG(3, s, t, "Magic %X Flags %X\n", amagic, aflags); controlnull(t); // ack + // proxy authentication type is not supported if (!(config->radius_authtypes & authtype)) authtype = config->radius_authprefer; // start LCP - sendlcp(t, s, authtype); + sendlcp(s, t, authtype); + sess_local[s].lcp.restart = time_now + config->ppp_restart_time; + sess_local[s].lcp.conf_sent = 1; + sess_local[s].lcp.nak_sent = 0; + sess_local[s].lcp_authtype = authtype; + session[s].ppp.lcp = RequestSent; + break; case 14: // CDN controlnull(t); // ack @@ -2460,44 +2472,37 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) { session[s].last_packet = time_now; if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } - processpap(t, s, p, l); + processpap(s, t, p, l); } else if (prot == PPPCHAP) { session[s].last_packet = time_now; if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } - processchap(t, s, p, l); + processchap(s, t, p, l); } else if (prot == PPPLCP) { session[s].last_packet = time_now; if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } - processlcp(t, s, p, l); + processlcp(s, t, p, l); } else if (prot == PPPIPCP) { session[s].last_packet = time_now; if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } - processipcp(t, s, p, l); + processipcp(s, t, p, l); } else if (prot == PPPIPV6CP) { - if (config->ipv6_prefix.s6_addr[0] > 0) - { - session[s].last_packet = time_now; - if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } - processipv6cp(t, s, p, l); - } - else - { - LOG(1, s, t, "IPv6 not configured; ignoring IPv6CP\n"); - } + session[s].last_packet = time_now; + if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } + processipv6cp(s, t, p, l); } else if (prot == PPPCCP) { session[s].last_packet = time_now; if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } - processccp(t, s, p, l); + processccp(s, t, p, l); } else if (prot == PPPIP) { @@ -2514,11 +2519,11 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) return; } - processipin(t, s, p, l); + processipin(s, t, p, l); } else if (prot == PPPIPV6) { - if (!config->ipv6_prefix.s6_addr[0] > 0) + if (!config->ipv6_prefix.s6_addr[0]) { LOG(1, s, t, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n"); return; @@ -2536,7 +2541,7 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) return; } - processipv6in(t, s, p, l); + processipv6in(s, t, p, l); } else { @@ -2567,7 +2572,7 @@ static void processtun(uint8_t * buf, int len) if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4 processipout(buf, len); else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6 - && config->ipv6_prefix.s6_addr[0] > 0) + && config->ipv6_prefix.s6_addr[0]) processipv6out(buf, len); // Else discard. @@ -2655,7 +2660,7 @@ static void regular_cleanups(double period) if (tunnel[t].state == TUNNELOPEN && tunnel[t].lastrec < TIME + 600) { controlt *c = controlnew(6); // sending HELLO - controladd(c, t, 0); // send the message + controladd(c, 0, t); // send the message LOG(3, 0, t, "Sending HELLO message\n"); t_actions++; } @@ -2709,12 +2714,123 @@ static void regular_cleanups(double period) continue; } - if (session[s].ip && !(session[s].flags & SF_IPCP_ACKED)) + // PPP timeouts + if (sess_local[s].lcp.restart <= time_now) { - // IPCP has not completed yet. Resend - LOG(3, s, session[s].tunnel, "No ACK for initial IPCP ConfigReq... resending\n"); - sendipcp(session[s].tunnel, s); - s_actions++; + int next_state = session[s].ppp.lcp; + switch (session[s].ppp.lcp) + { + case RequestSent: + case AckReceived: + next_state = RequestSent; + + case AckSent: + if (sess_local[s].lcp.conf_sent < config->ppp_max_configure) + { + LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n"); + sess_local[s].lcp.restart = time_now + config->ppp_restart_time; + sess_local[s].lcp.conf_sent++; + sendlcp(s, t, sess_local[s].lcp_authtype); + change_state(s, lcp, next_state); + } + else + { + sessionshutdown(s, "No response to LCP ConfigReq.", 3, 0); + STAT(session_timeout); + } + + s_actions++; + } + + if (session[s].die) + continue; + } + + if (sess_local[s].ipcp.restart <= time_now) + { + int next_state = session[s].ppp.ipcp; + switch (session[s].ppp.ipcp) + { + case RequestSent: + case AckReceived: + next_state = RequestSent; + + case AckSent: + if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure) + { + LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n"); + sess_local[s].ipcp.restart = time_now + config->ppp_restart_time; + sess_local[s].ipcp.conf_sent++; + sendipcp(s, t); + change_state(s, ipcp, next_state); + } + else + { + sessionshutdown(s, "No response to IPCP ConfigReq.", 3, 0); + STAT(session_timeout); + } + + s_actions++; + } + + if (session[s].die) + continue; + } + + if (sess_local[s].ipv6cp.restart <= time_now) + { + int next_state = session[s].ppp.ipv6cp; + switch (session[s].ppp.ipv6cp) + { + case RequestSent: + case AckReceived: + next_state = RequestSent; + + case AckSent: + if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure) + { + LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n"); + sess_local[s].ipv6cp.restart = time_now + config->ppp_restart_time; + sess_local[s].ipv6cp.conf_sent++; + sendipv6cp(s, t); + change_state(s, ipv6cp, next_state); + } + else + { + LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n"); + change_state(s, ipv6cp, Stopped); + } + + s_actions++; + } + } + + if (sess_local[s].ccp.restart <= time_now) + { + int next_state = session[s].ppp.ccp; + switch (session[s].ppp.ccp) + { + case RequestSent: + case AckReceived: + next_state = RequestSent; + + case AckSent: + if (sess_local[s].ccp.conf_sent < config->ppp_max_configure) + { + LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n"); + sess_local[s].ccp.restart = time_now + config->ppp_restart_time; + sess_local[s].ccp.conf_sent++; + sendccp(s, t); + change_state(s, ccp, next_state); + } + else + { + LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n"); + change_state(s, ccp, Stopped); + } + + s_actions++; + } } // Drop sessions who have not responded within IDLE_TIMEOUT seconds @@ -2727,11 +2843,11 @@ static void regular_cleanups(double period) } // No data in ECHO_TIMEOUT seconds, send LCP ECHO - if (session[s].user[0] && (time_now - session[s].last_packet >= ECHO_TIMEOUT)) + if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= ECHO_TIMEOUT)) { uint8_t b[MAXCONTROL] = {0}; - uint8_t *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP); + uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP); if (!q) continue; *q = EchoReq; @@ -2825,7 +2941,8 @@ static void regular_cleanups(double period) && !sess_local[s].radius // RADIUS already in progress && time_now - sess_local[s].last_interim >= config->radius_interim) { - if (!(r = radiusnew(s))) + int rad = radiusnew(s); + if (!rad) { LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n"); STAT(radius_overflow); @@ -2835,7 +2952,7 @@ static void regular_cleanups(double period) LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n", session[s].user, session[s].unique_id); - radiussend(r, RADIUSINTERIM); + radiussend(rad, RADIUSINTERIM); sess_local[s].last_interim = time_now; s_actions++; } @@ -2885,6 +3002,22 @@ static int still_busy(void) return 0; } + if (main_quit == QUIT_SHUTDOWN) + { + static int dropped = 0; + if (!dropped) + { + int i; + + LOG(1, 0, 0, "Dropping sessions and tunnels\n"); + for (i = 1; i < MAXTUNNEL; i++) + if (tunnel[i].ip || tunnel[i].state) + tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0); + + dropped = 1; + } + } + if (start_busy_wait == 0) start_busy_wait = TIME; @@ -2933,8 +3066,8 @@ static int still_busy(void) # include "fake_epoll.h" #endif -// the base set of fds polled: control, cli, udp, tun, cluster -#define BASE_FDS 5 +// the base set of fds polled: cli, cluster, tun, udp, control, dae +#define BASE_FDS 6 // additional polled fds #ifdef BGP @@ -2958,8 +3091,8 @@ static void mainloop(void) exit(1); } - LOG(4, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n", - udpfd, tunfd, cluster_sockfd, controlfd); + LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d\n", + clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd); /* setup our fds to poll for input */ { @@ -2969,25 +3102,29 @@ static void mainloop(void) e.events = EPOLLIN; i = 0; - d[i].type = FD_TYPE_CONTROL; - e.data.ptr = &d[i++]; - epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &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_UDP; + d[i].type = FD_TYPE_CLUSTER; e.data.ptr = &d[i++]; - epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e); + epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e); d[i].type = FD_TYPE_TUN; e.data.ptr = &d[i++]; epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e); - d[i].type = FD_TYPE_CLUSTER; + d[i].type = FD_TYPE_UDP; e.data.ptr = &d[i++]; - epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e); + epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e); + + d[i].type = FD_TYPE_CONTROL; + e.data.ptr = &d[i++]; + epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e); + + d[i].type = FD_TYPE_DAE; + e.data.ptr = &d[i++]; + epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e); } #ifdef BGP @@ -3031,14 +3168,14 @@ static void mainloop(void) continue; LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno)); - main_quit++; - break; + break; // exit } if (n) { struct sockaddr_in addr; - int alen, c, s; + socklen_t alen; + int c, s; int udp_ready = 0; int tun_ready = 0; int cluster_ready = 0; @@ -3055,12 +3192,6 @@ static void mainloop(void) struct event_data *d = events[i].data.ptr; switch (d->type) { - case FD_TYPE_CONTROL: // nsctl commands - alen = sizeof(addr); - processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen); - n--; - break; - case FD_TYPE_CLI: // CLI connections { int cli; @@ -3079,9 +3210,21 @@ static void mainloop(void) } // these are handled below, with multiple interleaved reads - case FD_TYPE_UDP: udp_ready++; break; - case FD_TYPE_TUN: tun_ready++; break; case FD_TYPE_CLUSTER: cluster_ready++; break; + case FD_TYPE_TUN: tun_ready++; break; + case FD_TYPE_UDP: udp_ready++; break; + + case FD_TYPE_CONTROL: // nsctl commands + alen = sizeof(addr); + processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen); + n--; + break; + + case FD_TYPE_DAE: // DAE requests + alen = sizeof(addr); + processdae(buf, recvfrom(daefd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen); + n--; + break; case FD_TYPE_RADIUS: // RADIUS response s = recv(radfds[d->index], buf, sizeof(buf), 0); @@ -3253,7 +3396,7 @@ static void mainloop(void) // // Important!!! We MUST not process any packets past this point! - LOG(1, 0, 0, "Clean shutdown complete\n"); + LOG(1, 0, 0, "Shutdown complete\n"); } static void stripdomain(char *host) @@ -3339,6 +3482,9 @@ static void initdata(int optdebug, char *optconfig) config->num_tbfs = MAXTBFS; config->rl_rate = 28; // 28kbps config->cluster_master_min_adv = 1; + config->ppp_restart_time = 3; + config->ppp_max_configure = 10; + config->ppp_max_failure = 5; strcpy(config->random_device, RANDOMDEVICE); log_stream = stderr; @@ -3706,7 +3852,7 @@ static void initippool() LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1); } -void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port) +void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port) { struct sockaddr_in snoop_addr = {0}; if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet) @@ -3902,11 +4048,18 @@ int main(int argc, char *argv[]) initrad(); initippool(); - signal(SIGHUP, sighup_handler); - signal(SIGTERM, sigterm_handler); - signal(SIGINT, sigterm_handler); - signal(SIGQUIT, sigquit_handler); + // seed prng + { + unsigned seed = time_now ^ getpid(); + LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed); + srand(seed); + } + + signal(SIGHUP, sighup_handler); signal(SIGCHLD, sigchild_handler); + signal(SIGTERM, shutdown_handler); + signal(SIGINT, shutdown_handler); + signal(SIGQUIT, shutdown_handler); // Prevent us from getting paged out if (config->lock_pages) @@ -3984,33 +4137,10 @@ static void sigalrm_handler(int sig) } -static void sigterm_handler(int sig) +static void shutdown_handler(int sig) { - LOG(1, 0, 0, "Shutting down cleanly\n"); - main_quit++; -} - -static void sigquit_handler(int sig) -{ - int i; - - LOG(1, 0, 0, "Shutting down without saving sessions\n"); - - if (config->cluster_iam_master) - { - for (i = 1; i < MAXSESSION; i++) - { - if (session[i].opened) - sessionkill(i, "L2TPNS Closing"); - } - for (i = 1; i < MAXTUNNEL; i++) - { - if (tunnel[i].ip || tunnel[i].state) - tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0); - } - } - - main_quit++; + LOG(1, 0, 0, "Shutting down\n"); + main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER; } static void sigchild_handler(int sig) @@ -4019,7 +4149,7 @@ static void sigchild_handler(int sig) ; } -static void build_chap_response(char *challenge, uint8_t id, uint16_t challenge_length, char **challenge_response) +static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response) { MD5_CTX ctx; *challenge_response = NULL; @@ -4032,13 +4162,13 @@ static void build_chap_response(char *challenge, uint8_t id, uint16_t challenge_ LOG(4, 0, 0, " Building challenge response for CHAP request\n"); - *challenge_response = (char *)calloc(17, 1); + *challenge_response = calloc(17, 1); - MD5Init(&ctx); - MD5Update(&ctx, &id, 1); - MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); - MD5Update(&ctx, challenge, challenge_length); - MD5Final(*challenge_response, &ctx); + MD5_Init(&ctx); + MD5_Update(&ctx, &id, 1); + MD5_Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); + MD5_Update(&ctx, challenge, challenge_length); + MD5_Final(*challenge_response, &ctx); return; } @@ -4177,6 +4307,9 @@ static void update_config() strcat(config->radius_authtypes_s, ", pap"); } + if (!config->radius_dae_port) + config->radius_dae_port = DAEPORT; + // re-initialise the random number source initrandom(config->random_device); @@ -4267,7 +4400,7 @@ static void read_config_file() update_config(); } -int sessionsetup(tunnelidt t, sessionidt s) +int sessionsetup(sessionidt s, tunnelidt t) { // A session now exists, set it up in_addr_t ip; @@ -4285,7 +4418,7 @@ int sessionsetup(tunnelidt t, sessionidt s) if (!session[s].ip) { LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n"); - sessionshutdown(s, "No IP addresses available.", 2, 7); + sessionshutdown(s, "No IP addresses available.", 2, 7); // try another return 0; } LOG(3, s, t, " No IP allocated. Assigned %s from pool\n", @@ -4345,13 +4478,8 @@ int sessionsetup(tunnelidt t, sessionidt s) cache_ipmap(session[s].ip, s); } - if (!session[s].unique_id) - { - // did this session just finish radius? - LOG(3, s, t, "Sending initial IPCP to client\n"); - sendipcp(t, s); - session[s].unique_id = ++last_id; - } + sess_local[s].lcp_authtype = 0; // RADIUS authentication complete + lcp_open(s, t); // transition to Network phase and send initial IPCP // Run the plugin's against this new session. { @@ -4460,7 +4588,7 @@ int load_session(sessionidt s, sessiont *new) } // check v6 routing - if (new->flags & SF_IPV6_ROUTED && !(session[s].flags & SF_IPV6_ROUTED)) + if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened) route6set(s, new->ipv6route, new->ipv6prefixlen, 1); // check filters @@ -4492,12 +4620,6 @@ int load_session(sessionidt s, sessiont *new) // for walking the sessions to forward byte counts to the master. config->cluster_highest_sessionid = s; - // TEMP: old session struct used a uint32_t to define the throttle - // speed for both up/down, new uses a uint16_t for each. Deal with - // sessions from an old master for migration. - if (new->throttle_out == 0 && new->tbf_out) - new->throttle_out = new->throttle_in; - memcpy(&session[s], new, sizeof(session[s])); // Copy over.. // Do fixups into address pool. @@ -4683,7 +4805,7 @@ static void plugins_done() run_plugin_done(p); } -static void processcontrol(uint8_t * buf, int len, struct sockaddr_in *addr, int alen) +static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen) { struct nsctl request; struct nsctl response; @@ -5004,14 +5126,14 @@ static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vec uint8_t digest[16]; uint8_t *last; size_t d = 0; + uint16_t m = htons(type); // Compute initial pad - MD5Init(&ctx); - MD5Update(&ctx, (uint8_t) (type >> 8) & 0xff, 1); - MD5Update(&ctx, (uint8_t) type & 0xff, 1); - MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); - MD5Update(&ctx, vector, vec_len); - MD5Final(digest, &ctx); + MD5_Init(&ctx); + MD5_Update(&ctx, (unsigned char *) &m, 2); + MD5_Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); + MD5_Update(&ctx, vector, vec_len); + MD5_Final(digest, &ctx); // pointer to last decoded 16 octets last = value; @@ -5021,10 +5143,10 @@ static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vec // calculate a new pad based on the last decoded block if (d >= sizeof(digest)) { - MD5Init(&ctx); - MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); - MD5Update(&ctx, last, sizeof(digest)); - MD5Final(digest, &ctx); + MD5_Init(&ctx); + MD5_Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); + MD5_Update(&ctx, last, sizeof(digest)); + MD5_Final(digest, &ctx); d = 0; last = value; @@ -5035,6 +5157,31 @@ static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vec } } +int find_filter(char const *name, size_t len) +{ + int free = -1; + int i; + + for (i = 0; i < MAXFILTER; i++) + { + if (!*ip_filters[i].name) + { + if (free < 0) + free = i; + + continue; + } + + if (strlen(ip_filters[i].name) != len) + continue; + + if (!strncmp(ip_filters[i].name, name, len)) + return i; + } + + return free; +} + static int ip_filter_port(ip_filter_portt *p, uint16_t port) { switch (p->op)