X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/3141b86973b160bd51aa16c60e4437f7c25758df..52cb7687d356002adccc46d0f5d690267442bc99:/l2tpns.c diff --git a/l2tpns.c b/l2tpns.c index 10ab3a5..9e9b34a 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 1.89 2005/04/01 06:39:00 bodea Exp $"; +char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.103 2005/05/13 01:29:40 bodea Exp $"; #include #include @@ -68,11 +68,10 @@ static int rand_fd = -1; // Random data source time_t basetime = 0; // base clock char hostname[1000] = ""; // us. static int tunidx; // ifr_ifindex of tun device -static uint32_t sessionid = 0; // session id for radius accounting static int syslog_log = 0; // are we logging to syslog -static FILE *log_stream = NULL; // file handle for direct logging (i.e. direct into file, not via syslog). +static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog). extern int cluster_sockfd; // Intra-cluster communications socket. -uint32_t last_id = 0; // Last used PPP SID. Can I kill this?? -- mo +uint32_t last_id = 0; // Unique ID for radius accounting struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI @@ -111,6 +110,7 @@ config_descriptt config_values[] = { CONFIG("primary_radius_port", radiusport[0], SHORT), CONFIG("secondary_radius_port", radiusport[1], SHORT), CONFIG("radius_accounting", radius_accounting, BOOL), + CONFIG("radius_interim", radius_interim, INT), CONFIG("radius_secret", radiussecret, STRING), CONFIG("radius_authtypes", radius_authtypes_s, STRING), CONFIG("bind_address", bind_address, IPv4), @@ -1323,11 +1323,11 @@ 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 s) +static void controladd(controlt * c, tunnelidt t, sessionidt far) { *(uint16_t *) (c->buf + 2) = htons(c->length); // length *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel - *(uint16_t *) (c->buf + 6) = htons(s ? session[s].far : 0); // session + *(uint16_t *) (c->buf + 6) = htons(far); // session *(uint16_t *) (c->buf + 8) = htons(tunnel[t].ns); // sequence tunnel[t].ns++; // advance sequence // link in message in to queue @@ -1456,22 +1456,18 @@ 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 = session[s].radius; + uint16_t r = sess_local[s].radius; if (!r) + r = radiusnew(s); + + if (r) { - if (!(r = radiusnew(s))) - { - LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n"); - STAT(radius_overflow); - } - else - { - random_data(radius[r].auth, sizeof(radius[r].auth)); - } + // stop, if not already trying + if (radius[r].state != RADIUSSTOP) + radiussend(r, RADIUSSTOP); } - - if (r && radius[r].state != RADIUSSTOP) - radiussend(r, RADIUSSTOP); // stop, if not already trying + else + LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n"); // Save counters to dump to accounting file if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct)) @@ -1522,7 +1518,7 @@ 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, s); // send the message + controladd(c, session[s].tunnel, session[s].far); // send the message } if (!session[s].die) @@ -1538,7 +1534,7 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error) void sendipcp(tunnelidt t, sessionidt s) { uint8_t buf[MAXCONTROL]; - uint16_t r = session[s].radius; + uint16_t r = sess_local[s].radius; uint8_t *q; CSTAT(sendipcp); @@ -1546,6 +1542,12 @@ void sendipcp(tunnelidt t, sessionidt s) 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; @@ -1556,7 +1558,7 @@ void sendipcp(tunnelidt t, sessionidt s) if (radius[r].try > 10) { radiusclear(r, s); // Clear radius session. - sessionshutdown(s, "No reply on IPCP", 3, 0); + sessionshutdown(s, "No reply to IPCP.", 3, 0); return; } @@ -1600,6 +1602,17 @@ void sendipcp(tunnelidt t, sessionidt s) } } +static void sessionclear(sessionidt s) +{ + memset(&session[s], 0, sizeof(session[s])); + memset(&sess_local[s], 0, sizeof(sess_local[s])); + memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s])); + + session[s].tunnel = T_FREE; // Mark it as free. + session[s].next = sessionfree; + sessionfree = s; +} + // kill a session now void sessionkill(sessionidt s, char *reason) { @@ -1617,16 +1630,11 @@ void sessionkill(sessionidt s, char *reason) session[s].die = TIME; sessionshutdown(s, reason, 3, 0); // close radius/routes, etc. - if (session[s].radius) - radiusclear(session[s].radius, s); // cant send clean accounting data, session is killed + if (sess_local[s].radius) + 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); - - memset(&session[s], 0, sizeof(session[s])); - session[s].tunnel = T_FREE; // Mark it as free. - session[s].next = sessionfree; - sessionfree = s; - cli_session_actions[s].action = 0; + sessionclear(s); cluster_send_session(s); } @@ -1793,12 +1801,11 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) uint16_t message = 0xFFFF; // message type uint8_t fatal = 0; uint8_t mandatory = 0; - uint8_t chap = 0; // if CHAP being used + uint8_t authtype = 0; // proxy auth type uint16_t asession = 0; // assigned session uint32_t amagic = 0; // magic number uint8_t aflags = 0; // flags from last LCF uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case) - int requestchap = 0; // do we request PAP instead of original CHAP request? char called[MAXTEL] = ""; // called number char calling[MAXTEL] = ""; // calling number @@ -2081,14 +2088,14 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) // LOG(4, s, t, "Firmware revision\n"); break; case 7: // host name - memset(tunnel[t].hostname, 0, 128); - memcpy(tunnel[t].hostname, b, (n >= 127) ? 127 : n); + memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname)); + memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1); LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname); // TBA - to send to RADIUS break; case 8: // vendor name memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor)); - memcpy(tunnel[t].vendor, b, (n >= sizeof(tunnel[t].vendor) - 1) ? sizeof(tunnel[t].vendor) - 1 : n); + memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1); LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor); break; case 9: // assigned tunnel @@ -2128,13 +2135,13 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) // TBA break; case 21: // called number - memset(called, 0, MAXTEL); - memcpy(called, b, (n >= MAXTEL) ? (MAXTEL-1) : n); + memset(called, 0, sizeof(called)); + memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1); LOG(4, s, t, " Called <%s>\n", called); break; case 22: // calling number - memset(calling, 0, MAXTEL); - memcpy(calling, b, (n >= MAXTEL) ? (MAXTEL-1) : n); + memset(calling, 0, sizeof(calling)); + memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1); LOG(4, s, t, " Calling <%s>\n", calling); break; case 23: // subtype @@ -2147,8 +2154,9 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) else { // AS5300s send connect speed as a string - char tmp[30] = {0}; - memcpy(tmp, b, (n >= 30) ? 30 : n); + char tmp[30]; + memset(tmp, 0, sizeof(tmp)); + memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1); session[s].tx_connect_speed = atol(tmp); } LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed); @@ -2161,8 +2169,9 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) else { // AS5300s send connect speed as a string - char tmp[30] = {0}; - memcpy(tmp, b, (n >= 30) ? 30 : n); + char tmp[30]; + memset(tmp, 0, sizeof(tmp)); + memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1); session[s].rx_connect_speed = atol(tmp); } LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed); @@ -2177,47 +2186,51 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) { uint16_t atype = ntohs(*(uint16_t *)b); LOG(4, s, t, " Proxy Auth Type %d (%s)\n", atype, auth_type(atype)); - requestchap = (atype == 2); + if (atype == 2) + authtype = AUTHCHAP; + else if (atype == 3) + authtype = AUTHPAP; + break; } case 30: // Proxy Authentication Name { - char authname[64] = {0}; - memcpy(authname, b, (n > 63) ? 63 : n); + char authname[64]; + memset(authname, 0, sizeof(authname)); + memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1); LOG(4, s, t, " Proxy Auth Name (%s)\n", authname); break; } case 31: // Proxy Authentication Challenge { - memcpy(radius[session[s].radius].auth, b, 16); 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 (session[s].radius) - radius[session[s].radius].id = authid; + if (sess_local[s].radius) + radius[sess_local[s].radius].id = authid; break; } case 33: // Proxy Authentication Response - { - char authresp[64] = {0}; - memcpy(authresp, b, (n > 63) ? 63 : n); - LOG(4, s, t, " Proxy Auth Response\n"); - break; - } - case 27: // last send lcp + LOG(4, s, t, " Proxy Auth Response\n"); + break; + case 27: // last sent lcp { // find magic number uint8_t *p = b, *e = p + n; while (p + 1 < e && p[1] && p + p[1] <= e) { if (*p == 5 && p[1] == 6) // Magic-Number amagic = ntohl(*(uint32_t *) (p + 2)); - else if (*p == 3 && p[1] == 5 && *(uint16_t *) (p + 2) == htons(PPPCHAP) && p[4] == 5) // Authentication-Protocol - chap = 1; + else if (*p == 3 && p[1] == 4 && *(uint16_t *) (p + 2) == htons(PPPPAP)) // Authentication-Protocol (PAP) + authtype = AUTHPAP; + else if (*p == 3 && p[1] == 5 && *(uint16_t *) (p + 2) == htons(PPPCHAP) && p[4] == 5) // Authentication-Protocol (CHAP) + authtype = AUTHCHAP; else if (*p == 7) // Protocol-Field-Compression aflags |= SESSIONPFC; else if (*p == 8) // Address-and-Control-Field-Compression @@ -2264,7 +2277,7 @@ 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, s); // send the resply + controladd(c, t, 0); // send the resply } tunnel[t].state = TUNNELOPENING; break; @@ -2292,16 +2305,9 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) // TBA break; case 10: // ICRQ - if (!sessionfree) - { - STAT(session_overflow); - LOG(1, 0, t, "No free sessions"); - return; - } - else + if (sessionfree) { uint16_t r; - controlt *c; s = sessionfree; sessionfree = session[s].next; @@ -2311,31 +2317,40 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) config->cluster_highest_sessionid = s; // make a RADIUS session - if (!(r = radiusnew(s))) + if ((r = radiusnew(s))) { - LOG(1, s, t, "No free RADIUS sessions for ICRQ\n"); - sessionkill(s, "no free RADIUS sesions"); - return; + 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; } - c = controlnew(11); // sending ICRP - session[s].id = sessionid++; - 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, s); // send the reply - - // Generate a random challenge - random_data(radius[r].auth, sizeof(radius[r].auth)); - 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); + + LOG(1, s, t, "No free RADIUS sessions for ICRQ\n"); + sessionclear(s); } - break; + else + { + STAT(session_overflow); + LOG(1, 0, t, "No free sessions\n"); + } + + { + controlt *c = controlnew(14); // CDN + control16(c, 1, 4, 1); // temporary lack of resources + controladd(c, session[s].tunnel, asession); // send the message + } + return; case 11: // ICRP // TBA break; @@ -2345,13 +2360,16 @@ 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 - // In CHAP state, request PAP instead - if (requestchap) - initlcp(t, s); + // proxy authentication type is not supported + if (!(config->radius_authtypes & authtype)) + authtype = config->radius_authprefer; + + // start LCP + sendlcp(t, s, authtype); break; case 14: // CDN controlnull(t); // ack - sessionshutdown(s, "Closed (Received CDN)", 0, 0); + sessionshutdown(s, "Closed (Received CDN).", 0, 0); break; case 0xFFFF: LOG(1, s, t, "Missing message type\n"); @@ -2620,25 +2638,28 @@ static int regular_cleanups(void) if (!session[s].opened) // Session isn't in use continue; - if (!session[s].die && session[s].ip && !(session[s].flags & SF_IPCP_ACKED)) + // check for expired sessions + if (session[s].die) { - // 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); + if (session[s].die <= TIME) + { + sessionkill(s, "Expired"); + if (++count >= MAX_ACTIONS) break; + } + continue; } - // check for expired sessions - if (session[s].die && session[s].die <= TIME) + if (session[s].ip && !(session[s].flags & SF_IPCP_ACKED)) { - sessionkill(s, "Expired"); - if (++count >= MAX_ACTIONS) break; - continue; + // 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); } // Drop sessions who have not responded within IDLE_TIMEOUT seconds if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT)) { - sessionshutdown(s, "No response to LCP ECHO requests", 3, 0); + sessionshutdown(s, "No response to LCP ECHO requests.", 3, 0); STAT(session_timeout); if (++count >= MAX_ACTIONS) break; continue; @@ -2672,7 +2693,7 @@ static int regular_cleanups(void) if (a & CLI_SESS_KILL) { LOG(2, s, session[s].tunnel, "Dropping session by CLI\n"); - sessionshutdown(s, "Requested by administrator", 3, 0); + sessionshutdown(s, "Requested by administrator.", 3, 0); a = 0; // dead, no need to check for other actions } @@ -2731,6 +2752,29 @@ static int regular_cleanups(void) if (++count >= MAX_ACTIONS) break; } + + // RADIUS interim accounting + if (config->radius_accounting && config->radius_interim > 0 + && session[s].ip && !session[s].walled_garden + && !sess_local[s].radius // RADIUS already in progress + && time_now - sess_local[s].last_interim >= config->radius_interim) + { + if (!(r = radiusnew(s))) + { + LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n"); + STAT(radius_overflow); + continue; + } + + LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n", + session[s].user, session[s].unique_id); + + radiussend(r, RADIUSINTERIM); + sess_local[s].last_interim = time_now; + + if (++count >= MAX_ACTIONS) + break; + } } if (*config->accounting_dir) @@ -3143,16 +3187,12 @@ static void initdata(int optdebug, char *optconfig) { int i; - if (!(_statistics = shared_malloc(sizeof(struct Tstats)))) - { - LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno)); - exit(1); - } if (!(config = shared_malloc(sizeof(configt)))) { - LOG(0, 0, 0, "Error doing malloc for configuration: %s\n", strerror(errno)); + fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno)); exit(1); } + memset(config, 0, sizeof(configt)); time(&config->start_time); strncpy(config->config_file, optconfig, strlen(optconfig)); @@ -3161,6 +3201,22 @@ static void initdata(int optdebug, char *optconfig) config->rl_rate = 28; // 28kbps strcpy(config->random_device, RANDOMDEVICE); + log_stream = stderr; + +#ifdef RINGBUFFER + if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer)))) + { + LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno)); + exit(1); + } + memset(ringbuffer, 0, sizeof(struct Tringbuffer)); +#endif + + if (!(_statistics = shared_malloc(sizeof(struct Tstats)))) + { + LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno)); + exit(1); + } if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL))) { LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno)); @@ -3197,15 +3253,6 @@ static void initdata(int optdebug, char *optconfig) } memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER); -#ifdef RINGBUFFER - if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer)))) - { - LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno)); - exit(1); - } - memset(ringbuffer, 0, sizeof(struct Tringbuffer)); -#endif - if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION))) { LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno)); @@ -3773,9 +3820,11 @@ int main(int argc, char *argv[]) static void sighup_handler(int sig) { - if (log_stream && log_stream != stderr) + if (log_stream) { - fclose(log_stream); + if (log_stream != stderr) + fclose(log_stream); + log_stream = NULL; } @@ -3897,7 +3946,9 @@ static void update_config() syslog_log = 0; if (log_stream) { - fclose(log_stream); + if (log_stream != stderr) + fclose(log_stream); + log_stream = NULL; } @@ -3945,7 +3996,7 @@ static void update_config() // test twice, In case someone works with // a secondary radius server without defining // a primary one, this will work even then. - if (i>0 && !config->radiusport[i]) + if (i > 0 && !config->radiusport[i]) config->radiusport[i] = config->radiusport[i-1]; if (!config->radiusport[i]) config->radiusport[i] = RADPORT; @@ -3959,7 +4010,7 @@ static void update_config() // parse radius_authtypes_s config->radius_authtypes = config->radius_authprefer = 0; p = config->radius_authtypes_s; - while (*p) + while (p && *p) { char *s = strpbrk(p, " \t,"); int type = 0; @@ -3979,11 +4030,13 @@ static void update_config() else if (!strncasecmp("pap", p, strlen(p))) type = AUTHPAP; else - LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"", p); + LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p); config->radius_authtypes |= type; if (!config->radius_authprefer) config->radius_authprefer = type; + + p = s; } if (!config->radius_authtypes) @@ -4115,7 +4168,7 @@ 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); return 0; } LOG(3, s, t, " No IP allocated. Assigned %s from pool\n", @@ -4383,6 +4436,7 @@ static int add_plugin(char *plugin_name) radiusnew, radiussend, getconfig, + sessionshutdown, sessionkill, throttle_session, cluster_send_session,