X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/c5e4c2cfc092317c1e3ceb0f654f880f6a8573f4..4e0597cd50268bc57fa118f1362360a2db2ec23a:/radius.c diff --git a/radius.c b/radius.c index 3f1d541..d2e2d3b 100644 --- a/radius.c +++ b/radius.c @@ -1,5 +1,6 @@ // L2TPNS Radius Stuff -// $Id: radius.c,v 1.1 2003-12-16 07:07:39 fred_nerk Exp $ + +char const *cvs_id_radius = "$Id: radius.c,v 1.11 2004-11-05 04:55:27 bodea Exp $"; #include #include @@ -7,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -16,20 +18,12 @@ #include "plugin.h" #include "util.h" -extern char *radiussecret; extern radiust *radius; extern sessiont *session; extern tunnelt *tunnel; -extern ipt radiusserver[MAXRADSERVER]; // radius servers extern u32 sessionid; -extern u8 radiusfree; -extern int radfd; -extern u8 numradiusservers; -extern char debug; -extern unsigned long default_dns1, default_dns2; -extern struct Tstats *_statistics; -extern int radius_accounting; -extern uint32_t bind_address; +extern struct configt *config; +extern int *radfds; const char *radius_state(int state) { @@ -46,37 +40,76 @@ const char *radius_state(int state) // Set up socket for radius requests void initrad(void) { - radfd = socket(AF_INET, SOCK_DGRAM, UDP); + int i; + LOG(3, 0, 0, 0, "Creating %d sockets for RADIUS queries\n", config->num_radfds); + radfds = calloc(sizeof(int), config->num_radfds); + for (i = 0; i < config->num_radfds; i++) + { + int flags; + if (!radfds[i]) radfds[i] = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); + flags = fcntl(radfds[i], F_GETFL, 0); + fcntl(radfds[i], F_SETFL, flags | O_NONBLOCK); + } } -void radiusclear(u8 r, sessionidt s) +void radiusclear(u16 r, sessionidt s) { - radius[r].state = RADIUSNULL; if (s) session[s].radius = 0; - memset(&radius[r], 0, sizeof(radius[r])); - radius[r].next = radiusfree; - radiusfree = r; + memset(&radius[r], 0, sizeof(radius[r])); // radius[r].state = RADIUSNULL; +} + + +static u16 get_free_radius() +{ + int count; + static u32 next_radius_id = 0; + + for (count = MAXRADIUS; count > 0 ; --count) + { + ++next_radius_id; // Find the next ID to check. + if (next_radius_id >= MAXRADIUS) + next_radius_id = 1; + + if (radius[next_radius_id].state == RADIUSNULL) + { + return next_radius_id; + } + } + + LOG(0, 0, 0, 0, "Can't find a free radius session! This is very bad!\n"); + return 0; } -u8 radiusnew(sessionidt s) +u16 radiusnew(sessionidt s) { - u8 r; - if (!radiusfree) + u16 r = session[s].radius; + + /* re-use */ + if (r) { - log(1, 0, s, session[s].tunnel, "No free RADIUS sessions\n"); + LOG(3, 0, s, session[s].tunnel, "Re-used radius %d\n", r); + return r; + } + + if (!(r = get_free_radius())) + { + LOG(1, 0, s, session[s].tunnel, "No free RADIUS sessions\n"); STAT(radius_overflow); return 0; }; - r = radiusfree; - session[s].radius = r; - radiusfree = radius[r].next; + memset(&radius[r], 0, sizeof(radius[r])); + session[s].radius = r; radius[r].session = s; + radius[r].state = RADIUSWAIT; + radius[r].retry = TIME + 1200; // Wait at least 120 seconds to re-claim this. + + LOG(3,0,s, session[s].tunnel, "Allocated radius %d\n", r); return r; } // Send a RADIUS request -void radiussend(u8 r, u8 state) +void radiussend(u16 r, u8 state) { struct sockaddr_in addr; u8 b[4096]; // RADIUS packet @@ -84,22 +117,22 @@ void radiussend(u8 r, u8 state) int pl; u8 *p; sessionidt s; -#ifdef STAT_CALLS - STAT(call_radiussend); -#endif - if (!numradiusservers) + + CSTAT(call_radiussend); + + s = radius[r].session; + if (!config->numradiusservers) { - log(0, 0, 0, 0, "No RADIUS servers\n"); + LOG(0, 0, s, session[s].tunnel, "No RADIUS servers\n"); return; } - if (!radiussecret) + if (!*config->radiussecret) { - log(0, 0, 0, 0, "No RADIUS secret\n"); + LOG(0, 0, s, session[s].tunnel, "No RADIUS secret\n"); return; } - s = radius[r].session; - if (state != RADIUSAUTH && !radius_accounting) + if (state != RADIUSAUTH && !config->radius_accounting) { // Radius accounting is turned off radiusclear(r, s); @@ -110,12 +143,21 @@ void radiussend(u8 r, u8 state) radius[r].try = 0; radius[r].state = state; radius[r].retry = backoff(radius[r].try++); - log(4, 0, s, session[s].tunnel, "Send RADIUS %d state %s try %d\n", r, radius_state(radius[r].state), radius[r].try); - if (radius[r].try > numradiusservers * 2) + LOG(4, 0, s, session[s].tunnel, "Send RADIUS id %d sock %d state %s try %d\n", + r >> RADIUS_SHIFT, r & RADIUS_MASK, + radius_state(radius[r].state), radius[r].try); + if (radius[r].try > config->numradiusservers * 2) { if (s) { - sessionshutdown(s, "RADIUS timeout"); + if (state == RADIUSAUTH) + sessionshutdown(s, "RADIUS timeout"); + else + { + LOG(1, 0, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n", + radius_states[state]); + radiusclear(r, s); + } STAT(radius_timeout); } else @@ -129,17 +171,17 @@ void radiussend(u8 r, u8 state) // contruct RADIUS access request switch (state) { - case RADIUSAUTH: - b[0] = 1; // access request - break; - case RADIUSSTART: - case RADIUSSTOP: - b[0] = 4; // accounting request - break; - default: - log(0, 0, 0, 0, "Unknown radius state %d\n", state); + case RADIUSAUTH: + b[0] = 1; // access request + break; + case RADIUSSTART: + case RADIUSSTOP: + b[0] = 4; // accounting request + break; + default: + LOG(0, 0, 0, 0, "Unknown radius state %d\n", state); } - b[1] = r; // identifier + b[1] = r >> RADIUS_SHIFT; // identifier memcpy(b + 4, radius[r].auth, 16); p = b + 20; if (s) @@ -177,7 +219,7 @@ void radiussend(u8 r, u8 state) { MD5_CTX ctx; MD5Init(&ctx); - MD5Update(&ctx, radiussecret, strlen(radiussecret)); + MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret)); if (p) MD5Update(&ctx, pass + p - 16, 16); else @@ -280,7 +322,7 @@ void radiussend(u8 r, u8 state) // NAS-IP-Address *p = 4; p[1] = 6; - *(u32 *)(p + 2) = bind_address; + *(u32 *)(p + 2) = config->bind_address; p += p[1]; // All AVpairs added @@ -295,52 +337,65 @@ void radiussend(u8 r, u8 state) MD5Update(&ctx, b, 4); MD5Update(&ctx, z, 16); MD5Update(&ctx, b + 20, (p - b) - 20); - MD5Update(&ctx, radiussecret, strlen(radiussecret)); + MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret)); MD5Final(hash, &ctx); memcpy(b + 4, hash, 16); memcpy(radius[r].auth, hash, 16); } memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; - *(u32 *) & addr.sin_addr = htonl(radiusserver[(radius[r].try - 1) % numradiusservers]); - addr.sin_port = htons((state == RADIUSAUTH) ? RADPORT : RADAPORT); + *(u32 *) & addr.sin_addr = config->radiusserver[(radius[r].try - 1) % config->numradiusservers]; + { + // get radius port + u16 port = config->radiusport[(radius[r].try - 1) % config->numradiusservers]; + // no need to define the accounting port for itself: + // the accounting port is as far as I know always one more + // than the auth port JK 20040713 + addr.sin_port = htons((state == RADIUSAUTH) ? port : port+1); + } - log_hex(5, "RADIUS Send", b, (p - b)); - sendto(radfd, b, p - b, 0, (void *) &addr, sizeof(addr)); + LOG_HEX(5, "RADIUS Send", b, (p - b)); + sendto(radfds[r & RADIUS_MASK], b, p - b, 0, (void *) &addr, sizeof(addr)); } // process RADIUS response -void processrad(u8 * buf, int len) +void processrad(u8 *buf, int len, char socket_index) { u8 b[MAXCONTROL]; MD5_CTX ctx; - u8 r; + u16 r; sessionidt s; tunnelidt t = 0; hasht hash; u8 routes = 0; -#ifdef STAT_CALLS - STAT(call_processrad); -#endif - log_hex(5, "RADIUS Response", buf, len); + int r_code, r_id ; // Radius code. + + r_code = buf[0]; // First byte in radius packet. + r_id = buf[1]; // radius reply indentifier. + + + CSTAT(call_processrad); + + LOG_HEX(5, "RADIUS Response", buf, len); if (len < 20 || len < ntohs(*(u16 *) (buf + 2))) { - log(1, 0, 0, 0, "Duff RADIUS response length %d\n", len); + LOG(1, 0, 0, 0, "Duff RADIUS response length %d\n", len); return ; } len = ntohs(*(u16 *) (buf + 2)); - r = buf[1]; + r = socket_index | (r_id << RADIUS_SHIFT); s = radius[r].session; - log(3, 0, s, session[s].tunnel, "Received %s, radius %d response for session %u\n", radius_states[radius[r].state], r, s); + LOG(3, 0, s, session[s].tunnel, "Received %s, radius %d response for session %u (code %d, id %d)\n", + radius_states[radius[r].state], r, s, r_code, r_id); if (!s && radius[r].state != RADIUSSTOP) { - log(1, 0, s, session[s].tunnel, " Unexpected RADIUS response\n"); + LOG(1, 0, s, session[s].tunnel, " Unexpected RADIUS response\n"); return; } if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSSTART && radius[r].state != RADIUSSTOP) { - log(1, 0, s, session[s].tunnel, " Unexpected RADIUS response\n"); + LOG(1, 0, s, session[s].tunnel, " Unexpected RADIUS response\n"); return; } t = session[s].tunnel; @@ -348,38 +403,39 @@ void processrad(u8 * buf, int len) MD5Update(&ctx, buf, 4); MD5Update(&ctx, radius[r].auth, 16); MD5Update(&ctx, buf + 20, len - 20); - MD5Update(&ctx, radiussecret, strlen(radiussecret)); + MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret)); MD5Final(hash, &ctx); do { if (memcmp(hash, buf + 4, 16)) { - log(0, 0, s, session[s].tunnel, " Incorrect auth on RADIUS response\n"); - radius[r].state = RADIUSWAIT; - break; + LOG(0, 0, s, session[s].tunnel, " Incorrect auth on RADIUS response!! (wrong secret in radius config?)\n"); + return; // Do nothing. On timeout, it will try the next radius server. } if ((radius[r].state == RADIUSAUTH && *buf != 2 && *buf != 3) || ((radius[r].state == RADIUSSTART || radius[r].state == RADIUSSTOP) && *buf != 5)) { - log(1, 0, s, session[s].tunnel, " Unexpected RADIUS response %d\n", *buf); - radius[r].state = RADIUSWAIT; - break; + LOG(1, 0, s, session[s].tunnel, " Unexpected RADIUS response %d\n", *buf); + return; // We got something we didn't expect. Let the timeouts take + // care off finishing the radius session if that's really correct. } if (radius[r].state == RADIUSAUTH) { - log(4, 0, s, session[s].tunnel, " Original response is \"%s\"\n", (*buf == 2) ? "accept" : "reject"); + LOG(4, 0, s, session[s].tunnel, " Original response is \"%s\"\n", (*buf == 2) ? "accept" : "reject"); // process auth response if (radius[r].chap) { // CHAP - u8 *p = makeppp(b, 0, 0, t, s, PPPCHAP); - + u8 *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPCHAP); + if (!p) { + return; // Abort! + } { struct param_post_auth packet = { &tunnel[t], &session[s], session[s].user, (*buf == 2), PPPCHAP }; run_plugins(PLUGIN_POST_AUTH, &packet); *buf = packet.auth_allowed ? 2 : 3; } - log(3, 0, s, session[s].tunnel, " CHAP User %s authentication %s.\n", session[s].user, + LOG(3, 0, s, session[s].tunnel, " CHAP User %s authentication %s.\n", session[s].user, (*buf == 2) ? "allowed" : "denied"); *p = (*buf == 2) ? 3 : 4; // ack/nak p[1] = radius[r].id; @@ -389,7 +445,9 @@ void processrad(u8 * buf, int len) else { // PAP - u8 *p = makeppp(b, 0, 0, t, s, PPPPAP); + u8 *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP); + if (!p) + return; // Abort! { struct param_post_auth packet = { &tunnel[t], &session[s], session[s].user, (*buf == 2), PPPPAP }; @@ -397,7 +455,7 @@ void processrad(u8 * buf, int len) *buf = packet.auth_allowed ? 2 : 3; } - log(3, 0, s, session[s].tunnel, " PAP User %s authentication %s.\n", session[s].user, + LOG(3, 0, s, session[s].tunnel, " PAP User %s authentication %s.\n", session[s].user, (*buf == 2) ? "allowed" : "denied"); // ack/nak *p = *buf; @@ -418,19 +476,20 @@ void processrad(u8 * buf, int len) if (*p == 8) { // Statically assigned address - log(3, 0, s, session[s].tunnel, " Radius reply contains IP address %s\n", inet_toa(*(u32 *) (p + 2))); + LOG(3, 0, s, session[s].tunnel, " Radius reply contains IP address %s\n", inet_toa(*(u32 *) (p + 2))); session[s].ip = ntohl(*(u32 *) (p + 2)); + session[s].ip_pool_index = -1; } else if (*p == 135) { // DNS address - log(3, 0, s, session[s].tunnel, " Radius reply contains primary DNS address %s\n", inet_toa(ntohl(*(u32 *) (p + 2)))); + LOG(3, 0, s, session[s].tunnel, " Radius reply contains primary DNS address %s\n", inet_toa(*(u32 *) (p + 2))); session[s].dns1 = ntohl(*(u32 *) (p + 2)); } else if (*p == 136) { // DNS address - log(3, 0, s, session[s].tunnel, " Radius reply contains secondary DNS address %s\n", inet_toa(ntohl(*(u32 *) (p + 2)))); + LOG(3, 0, s, session[s].tunnel, " Radius reply contains secondary DNS address %s\n", inet_toa(*(u32 *) (p + 2))); session[s].dns2 = ntohl(*(u32 *) (p + 2)); } else if (*p == 22) @@ -468,13 +527,16 @@ void processrad(u8 * buf, int len) mask = 0xFFFFFF00; if (routes == MAXROUTE) { - log(1, 0, s, session[s].tunnel, " Too many routes\n"); + LOG(1, 0, s, session[s].tunnel, " Too many routes\n"); } - else + else if (ip) { - log(3, 0, s, session[s].tunnel, " Radius reply contains route for %d/%d\n", - inet_toa(ip), - inet_toa(mask)); + char *ips, *masks; + ips = strdup(inet_toa(htonl(ip))); + masks = strdup(inet_toa(htonl(mask))); + LOG(3, 0, s, session[s].tunnel, " Radius reply contains route for %s/%s\n", ips, masks); + free(ips); + free(masks); session[s].route[routes].ip = ip; session[s].route[routes].mask = mask; routes++; @@ -486,16 +548,16 @@ void processrad(u8 * buf, int len) int vendor = ntohl(*(int *)(p + 2)); char attrib = *(p + 6); char attrib_length = *(p + 7) - 2; - log(3, 0, s, session[s].tunnel, " Radius reply contains Vendor-Specific. Vendor=%d Attrib=%d Length=%d\n", vendor, attrib, attrib_length); + LOG(3, 0, s, session[s].tunnel, " Radius reply contains Vendor-Specific. Vendor=%d Attrib=%d Length=%d\n", vendor, attrib, attrib_length); if (attrib_length == 0) continue; if (attrib != 1) - log(3, 0, s, session[s].tunnel, " Unknown vendor-specific\n"); + LOG(3, 0, s, session[s].tunnel, " Unknown vendor-specific\n"); else { char *avpair, *value, *key, *newp; avpair = key = calloc(attrib_length + 1, 1); memcpy(avpair, p + 8, attrib_length); - log(3, 0, s, session[s].tunnel, " Cisco-Avpair value: %s\n", avpair); + LOG(3, 0, s, session[s].tunnel, " Cisco-Avpair value: %s\n", avpair); do { value = strchr(key, '='); if (!value) break; @@ -527,46 +589,31 @@ void processrad(u8 * buf, int len) } else if (*buf == 3) { - log(2, 0, s, session[s].tunnel, " Authentication denied for %s\n", session[s].user); + LOG(2, 0, s, session[s].tunnel, " Authentication denied for %s\n", session[s].user); +//FIXME: We should tear down the session here! break; } - // Check for Assign-IP-Address - if (!session[s].ip || session[s].ip == 0xFFFFFFFE) + if (!session[s].dns1 && config->default_dns1) { - session[s].ip = assign_ip_address(); - if (session[s].ip) - log(3, 0, s, t, " No IP allocated by radius. Assigned %s from pool\n", - inet_toa(htonl(session[s].ip))); - else - log(3, 0, s, t, " No IP allocated by radius. None available in pool\n"); + session[s].dns1 = htonl(config->default_dns1); + LOG(3, 0, s, t, " Sending dns1 = %s\n", inet_toa(config->default_dns1)); } - if (!session[s].dns1 && default_dns1) + if (!session[s].dns2 && config->default_dns2) { - session[s].dns1 = htonl(default_dns1); - log(3, 0, s, t, " Sending dns1 = %s\n", inet_toa(default_dns1)); - } - if (!session[s].dns2 && default_dns2) - { - session[s].dns2 = htonl(default_dns2); - log(3, 0, s, t, " Sending dns2 = %s\n", inet_toa(default_dns2)); + session[s].dns2 = htonl(config->default_dns2); + LOG(3, 0, s, t, " Sending dns2 = %s\n", inet_toa(config->default_dns2)); } - if (session[s].ip) - { - // Valid Session, set it up - session[s].sid = 0; - sessionsetup(t, s, routes); - } - else - { - log(0, 0, s, t, " End of processrad(), but no valid session exists.\n"); - sessionkill(s, "Can't create valid session"); - } + // Valid Session, set it up + session[s].unique_id = 0; + sessionsetup(t, s); } else { - log(3, 0, s, t, " RADIUS response in state %d\n", radius[r].state); + // An ack for a stop or start record. + LOG(3, 0, s, t, " RADIUS accounting ack recv in state %s\n", radius_states[radius[r].state]); + break; } } while (0); @@ -575,40 +622,55 @@ void processrad(u8 * buf, int len) } // Send a retry for RADIUS/CHAP message -void radiusretry(u8 r) +void radiusretry(u16 r) { sessionidt s = radius[r].session; tunnelidt t = 0; -#ifdef STAT_CALLS - STAT(call_radiusretry); -#endif + + CSTAT(call_radiusretry); + if (s) t = session[s].tunnel; - radius[r].retry = 0; + radius[r].retry = backoff(radius[r].try + 1); switch (radius[r].state) { - case RADIUSCHAP: // sending CHAP down PPP - sendchap(t, s); - break; - case RADIUSIPCP: - sendipcp(t, s); // send IPCP - break; - case RADIUSAUTH: // sending auth to RADIUS server - radiussend(r, RADIUSAUTH); - break; - case RADIUSSTART: // sending start accounting to RADIUS server - radiussend(r, RADIUSSTART); - break; - case RADIUSSTOP: // sending stop accounting to RADIUS server - radiussend(r, RADIUSSTOP); - break; - default: - case RADIUSNULL: // Not in use - case RADIUSWAIT: // waiting timeout before available, in case delayed reply from RADIUS server - // free up RADIUS task - radiusclear(r, s); - log(3, 0, s, session[s].tunnel, "Freeing up radius session %d\n", r); - break; + case RADIUSCHAP: // sending CHAP down PPP + sendchap(t, s); + break; + case RADIUSIPCP: + sendipcp(t, s); // send IPCP + break; + case RADIUSAUTH: // sending auth to RADIUS server + radiussend(r, RADIUSAUTH); + break; + case RADIUSSTART: // sending start accounting to RADIUS server + radiussend(r, RADIUSSTART); + break; + case RADIUSSTOP: // sending stop accounting to RADIUS server + radiussend(r, RADIUSSTOP); + break; + default: + case RADIUSNULL: // Not in use + case RADIUSWAIT: // waiting timeout before available, in case delayed reply from RADIUS server + // free up RADIUS task + radiusclear(r, s); + LOG(3, 0, s, session[s].tunnel, "Freeing up radius session %d\n", r); + break; } } +void radius_clean() +{ + int i; + + LOG(1, 0, 0, 0, "Cleaning radius session array\n"); + + for (i = 1; i < MAXRADIUS; i++) + { + if (radius[i].retry == 0 + || !session[radius[i].session].opened + || session[radius[i].session].die + || session[radius[i].session].tunnel == 0) + radiusclear(i, radius[i].session); + } +}