X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/10ac4633cdf32b79934b17e21b0c1fb373e98d5f..52cb7687d356002adccc46d0f5d690267442bc99:/l2tpns.c diff --git a/l2tpns.c b/l2tpns.c index d1de108..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 1.95 2005/05/06 23:31:50 bodea Exp $"; +char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.103 2005/05/13 01:29:40 bodea Exp $"; #include #include @@ -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 @@ -1458,20 +1458,16 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error) // RADIUS Stop message 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) @@ -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; @@ -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) { @@ -1621,12 +1634,7 @@ void sessionkill(sessionidt s, char *reason) 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); @@ -2177,13 +2186,18 @@ 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; @@ -2204,21 +2218,19 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) 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 @@ -2265,7 +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; @@ -2293,16 +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\n"); - return; - } - else + if (sessionfree) { uint16_t r; - controlt *c; s = sessionfree; sessionfree = session[s].next; @@ -2312,30 +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].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; @@ -2345,9 +2360,12 @@ 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 @@ -2748,8 +2766,6 @@ static int regular_cleanups(void) continue; } - random_data(radius[r].auth, sizeof(radius[r].auth)); - LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n", session[s].user, session[s].unique_id); @@ -3980,7 +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; @@ -3994,7 +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; @@ -4019,6 +4035,8 @@ static void update_config() config->radius_authtypes |= type; if (!config->radius_authprefer) config->radius_authprefer = type; + + p = s; } if (!config->radius_authtypes) @@ -4418,6 +4436,7 @@ static int add_plugin(char *plugin_name) radiusnew, radiussend, getconfig, + sessionshutdown, sessionkill, throttle_session, cluster_send_session,