X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/97ad99cc23c5f0007de461afb200fd83c3d20481..a222a373d7b01b08f7cb2979d8a0c4c04f0c8e3d:/radius.c diff --git a/radius.c b/radius.c index 567cd72..4eda15f 100644 --- a/radius.c +++ b/radius.c @@ -1,7 +1,5 @@ // L2TPNS Radius Stuff -char const *cvs_id_radius = "$Id: radius.c,v 1.23 2005/01/25 04:19:06 bodea Exp $"; - #include #include #include @@ -12,11 +10,18 @@ char const *cvs_id_radius = "$Id: radius.c,v 1.23 2005/01/25 04:19:06 bodea Exp #include #include #include +#include + #include "md5.h" #include "constants.h" +#include "dhcp6.h" #include "l2tpns.h" #include "plugin.h" #include "util.h" +#include "cluster.h" + +#include "l2tplac.h" +#include "pppoe.h" extern radiust *radius; extern sessiont *session; @@ -25,24 +30,78 @@ extern configt *config; extern int *radfds; extern ip_filtert *ip_filters; +static const hasht zero; + +static void calc_auth(const void *buf, size_t len, const uint8_t *in, uint8_t *out) +{ + MD5_CTX ctx; + + MD5_Init(&ctx); + MD5_Update(&ctx, (void *)buf, 4); // code, id, length + MD5_Update(&ctx, (void *)in, 16); // auth + MD5_Update(&ctx, (void *)(buf + 20), len - 20); + MD5_Update(&ctx, config->radiussecret, strlen(config->radiussecret)); + MD5_Final(out, &ctx); +} + // Set up socket for radius requests void initrad(void) { int i; - LOG(3, 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++) + uint16_t port = 0; + uint16_t min = config->radius_bind_min; + uint16_t max = config->radius_bind_max; + int inc = 1; + struct sockaddr_in addr; + + if (min) + { + port = min; + if (!max) + max = ~0 - 1; + } + else if (max) /* no minimum specified, bind from max down */ + { + port = max; + min = 1; + inc = -1; + } + + LOG(3, 0, 0, "Creating %d sockets for RADIUS queries\n", RADIUS_FDS); + radfds = calloc(sizeof(int), RADIUS_FDS); + for (i = 0; i < RADIUS_FDS; i++) { int flags; radfds[i] = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); flags = fcntl(radfds[i], F_GETFL, 0); fcntl(radfds[i], F_SETFL, flags | O_NONBLOCK); + + if (port) + { + int b; + + memset(&addr, 0, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_addr.s_addr = INADDR_ANY; + + do { + addr.sin_port = htons(port); + if ((b = bind(radfds[i], (struct sockaddr *) &addr, sizeof(addr))) < 0) + { + if ((port += inc) < min || port > max) + { + LOG(0, 0, 0, "Can't bind RADIUS socket in range %u-%u\n", min, max); + exit(1); + } + } + } while (b < 0); + } } } void radiusclear(uint16_t r, sessionidt s) { - if (s) session[s].radius = 0; + if (s) sess_local[s].radius = 0; memset(&radius[r], 0, sizeof(radius[r])); // radius[r].state = RADIUSNULL; } @@ -51,7 +110,7 @@ static uint16_t get_free_radius() int count; static uint32_t next_radius_id = 0; - for (count = MAXRADIUS; count > 0 ; --count) + for (count = MAXRADIUS; count > 0; --count) { ++next_radius_id; // Find the next ID to check. if (next_radius_id >= MAXRADIUS) @@ -69,7 +128,7 @@ static uint16_t get_free_radius() uint16_t radiusnew(sessionidt s) { - uint16_t r = session[s].radius; + uint16_t r = sess_local[s].radius; /* re-use */ if (r) @@ -86,11 +145,13 @@ uint16_t radiusnew(sessionidt s) }; memset(&radius[r], 0, sizeof(radius[r])); - session[s].radius = r; + sess_local[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. + random_data(radius[r].auth, sizeof(radius[r].auth)); + LOG(3, s, session[s].tunnel, "Allocated radius %d\n", r); return r; } @@ -119,7 +180,7 @@ void radiussend(uint16_t r, uint8_t state) return; } - if (state != RADIUSAUTH && !config->radius_accounting) + if (state != RADIUSAUTH && state != RADIUSJUSTAUTH && !config->radius_accounting) { // Radius accounting is turned off radiusclear(r, s); @@ -130,7 +191,7 @@ void radiussend(uint16_t r, uint8_t state) radius[r].try = 0; radius[r].state = state; - radius[r].retry = backoff(radius[r].try++); + radius[r].retry = backoff(radius[r].try++) + 20; // 3s, 4s, 6s, 10s... LOG(4, 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); @@ -139,8 +200,8 @@ void radiussend(uint16_t r, uint8_t state) { if (s) { - if (state == RADIUSAUTH) - sessionshutdown(s, "RADIUS timeout"); + if (state == RADIUSAUTH || state == RADIUSJUSTAUTH) + sessionshutdown(s, "RADIUS timeout.", CDN_ADMIN_DISC, TERM_REAUTHENTICATION_FAILURE); else { LOG(1, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n", @@ -161,26 +222,29 @@ void radiussend(uint16_t r, uint8_t state) switch (state) { case RADIUSAUTH: - b[0] = 1; // access request + case RADIUSJUSTAUTH: + b[0] = AccessRequest; // access request break; case RADIUSSTART: case RADIUSSTOP: - b[0] = 4; // accounting request + case RADIUSINTERIM: + b[0] = AccountingRequest; // accounting request break; default: LOG(0, 0, 0, "Unknown radius state %d\n", state); } b[1] = r >> RADIUS_SHIFT; // identifier memcpy(b + 4, radius[r].auth, 16); + p = b + 20; if (s) { *p = 1; // user name p[1] = strlen(session[s].user) + 2; - strcpy(p + 2, session[s].user); + strcpy((char *) p + 2, session[s].user); p += p[1]; } - if (state == RADIUSAUTH) + if (state == RADIUSAUTH || state == RADIUSJUSTAUTH) { if (radius[r].chap) { @@ -207,13 +271,13 @@ void radiussend(uint16_t r, uint8_t state) while (p < pl) { MD5_CTX ctx; - MD5Init(&ctx); - MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret)); + MD5_Init(&ctx); + MD5_Update(&ctx, config->radiussecret, strlen(config->radiussecret)); if (p) - MD5Update(&ctx, pass + p - 16, 16); + MD5_Update(&ctx, pass + p - 16, 16); else - MD5Update(&ctx, radius[r].auth, 16); - MD5Final(hash, &ctx); + MD5_Update(&ctx, radius[r].auth, 16); + MD5_Final(hash, &ctx); do { pass[p] ^= hash[p & 15]; @@ -229,85 +293,169 @@ void radiussend(uint16_t r, uint8_t state) p += p[1]; } } - else if (state == RADIUSSTART || state == RADIUSSTOP) - { // accounting - *p = 40; // accounting type + else // accounting + { + *p = 40; // accounting type p[1] = 6; - *(uint32_t *) (p + 2) = htonl((state == RADIUSSTART) ? 1 : 2); + *(uint32_t *) (p + 2) = htonl(state - RADIUSSTART + 1); // start=1, stop=2, interim=3 p += p[1]; if (s) { - *p = 44; // session ID + *p = 44; // session ID p[1] = 18; - sprintf(p + 2, "%08X%08X", session[s].id, session[s].opened); + sprintf((char *) p + 2, "%08X%08X", session[s].unique_id, session[s].opened); p += p[1]; - if (state == RADIUSSTOP) - { // stop - *p = 42; // input octets + if (state == RADIUSSTART) + { // start + *p = 41; // delay + p[1] = 6; + *(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened); + p += p[1]; + sess_local[s].last_interim = time_now; // Setup "first" Interim + } + else + { // stop, interim + *p = 42; // input octets p[1] = 6; *(uint32_t *) (p + 2) = htonl(session[s].cin); p += p[1]; - *p = 43; // output octets + + *p = 43; // output octets p[1] = 6; *(uint32_t *) (p + 2) = htonl(session[s].cout); p += p[1]; - *p = 46; // session time + + *p = 46; // session time p[1] = 6; *(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened); p += p[1]; - *p = 47; // input packets + + *p = 47; // input packets p[1] = 6; *(uint32_t *) (p + 2) = htonl(session[s].pin); p += p[1]; - *p = 48; // output spackets + + *p = 48; // output packets p[1] = 6; *(uint32_t *) (p + 2) = htonl(session[s].pout); p += p[1]; - } - else - { // start - *p = 41; // delay + + *p = 52; // input gigawords p[1] = 6; - *(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened); + *(uint32_t *) (p + 2) = htonl(session[s].cin_wrap); p += p[1]; + + *p = 53; // output gigawords + p[1] = 6; + *(uint32_t *) (p + 2) = htonl(session[s].cout_wrap); + p += p[1]; + + if (state == RADIUSSTOP && radius[r].term_cause) + { + *p = 49; // acct-terminate-cause + p[1] = 6; + *(uint32_t *) (p + 2) = htonl(radius[r].term_cause); + p += p[1]; + + if (radius[r].term_msg) + { + *p = 26; // vendor-specific + *(uint32_t *) (p + 2) = htonl(9); // Cisco + p[6] = 1; // Cisco-AVPair + p[7] = 2 + sprintf((char *) p + 8, "disc-cause-ext=%s", radius[r].term_msg); + p[1] = p[7] + 6; + p += p[1]; + } + } + } + + if (session[s].classlen) { + *p = 25; // class + p[1] = session[s].classlen + 2; + memcpy(p + 2, session[s].class, session[s].classlen); + p += p[1]; + } + + { + struct param_radius_account acct = { &tunnel[session[s].tunnel], &session[s], &p }; + run_plugins(PLUGIN_RADIUS_ACCOUNT, &acct); } } } + if (s) { - *p = 5; // NAS-Port + *p = 5; // NAS-Port p[1] = 6; *(uint32_t *) (p + 2) = htonl(s); p += p[1]; - } - if (s && session[s].ip) - { - *p = 8; // Framed-IP-Address + + *p = 6; // Service-Type p[1] = 6; - *(uint32_t *) (p + 2) = htonl(session[s].ip); - p += p[1]; - } - if (*session[s].called) - { - *p = 30; // called - p[1] = strlen(session[s].called) + 2; - strcpy(p + 2, session[s].called); + *(uint32_t *) (p + 2) = htonl((state == RADIUSJUSTAUTH ? 8 : 2)); // Authenticate only or Framed-User respectevily p += p[1]; - } - if (*radius[r].calling) - { - *p = 31; // calling - p[1] = strlen(radius[r].calling) + 2; - strcpy(p + 2, radius[r].calling); - p += p[1]; - } - else if (*session[s].calling) - { - *p = 31; // calling - p[1] = strlen(session[s].calling) + 2; - strcpy(p + 2, session[s].calling); + + *p = 7; // Framed-Protocol + p[1] = htonl((state == RADIUSJUSTAUTH ? 0 : 6)); + *(uint32_t *) (p + 2) = htonl((state == RADIUSJUSTAUTH ? 0 : 1)); // PPP p += p[1]; + + if (session[s].ip) + { + *p = 8; // Framed-IP-Address + p[1] = 6; + *(uint32_t *) (p + 2) = htonl(session[s].ip); + p += p[1]; + } + + if (session[s].route[0].ip) + { + int r; + for (r = 0; s && r < MAXROUTE && session[s].route[r].ip; r++) + { + *p = 22; // Framed-Route + p[1] = sprintf((char *) p + 2, "%s/%d %s 1", + fmtaddr(htonl(session[s].route[r].ip), 0), + session[s].route[r].prefixlen, + fmtaddr(htonl(session[s].ip), 1)) + 2; + + p += p[1]; + } + } + + if (session[s].session_timeout) + { + *p = 27; // Session-Timeout + p[1] = 6; + *(uint32_t *) (p + 2) = htonl(session[s].session_timeout); + p += p[1]; + } + + if (session[s].idle_timeout) + { + *p = 28; // Idle-Timeout + p[1] = 6; + *(uint32_t *) (p + 2) = htonl(session[s].idle_timeout); + p += p[1]; + } + + if (*session[s].called) + { + *p = 30; // called + p[1] = strlen(session[s].called) + 2; + strcpy((char *) p + 2, session[s].called); + p += p[1]; + } + + if (*session[s].calling) + { + *p = 31; // calling + p[1] = strlen(session[s].calling) + 2; + strcpy((char *) p + 2, session[s].calling); + p += p[1]; + } } + // NAS-IP-Address *p = 4; p[1] = 6; @@ -316,20 +464,11 @@ void radiussend(uint16_t r, uint8_t state) // All AVpairs added *(uint16_t *) (b + 2) = htons(p - b); - if (state != RADIUSAUTH) - { - // Build auth for accounting packet - char z[16] = {0}; - char hash[16] = {0}; - MD5_CTX ctx; - MD5Init(&ctx); - MD5Update(&ctx, b, 4); - MD5Update(&ctx, z, 16); - MD5Update(&ctx, b + 20, (p - b) - 20); - MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret)); - MD5Final(hash, &ctx); - memcpy(b + 4, hash, 16); - memcpy(radius[r].auth, hash, 16); + if (state != RADIUSAUTH && state != RADIUSJUSTAUTH) + { + // Build auth for accounting packet + calc_auth(b, p - b, zero, b + 4); + memcpy(radius[r].auth, b + 4, 16); } memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; @@ -338,25 +477,67 @@ void radiussend(uint16_t r, uint8_t state) // get radius port uint16_t port = config->radiusport[(radius[r].try - 1) % config->numradiusservers]; // assume RADIUS accounting port is the authentication port +1 - addr.sin_port = htons((state == RADIUSAUTH) ? port : port+1); + addr.sin_port = htons((state == RADIUSAUTH || state == RADIUSJUSTAUTH) ? port : port+1); } LOG_HEX(5, "RADIUS Send", b, (p - b)); sendto(radfds[r & RADIUS_MASK], b, p - b, 0, (void *) &addr, sizeof(addr)); } +static void handle_avpair(sessionidt s, uint8_t *avp, int len) +{ + uint8_t *key = avp; + uint8_t *value = memchr(avp, '=', len); + uint8_t tmp[2048] = ""; + + if (value) + { + *value++ = 0; + len -= value - key; + } + else + { + value = tmp; + len = 0; + } + + // strip quotes + if (len > 2 && (*value == '"' || *value == '\'') && value[len - 1] == *value) + { + value++; + len--; + value[len - 1] = 0; + } + // copy and null terminate + else if (len < sizeof(tmp) - 1) + { + memcpy(tmp, value, len); + tmp[len] = 0; + value = tmp; + } + else + return; + + // Run hooks + { + struct param_radius_response p = { &tunnel[session[s].tunnel], &session[s], (char *) key, (char *) value }; + run_plugins(PLUGIN_RADIUS_RESPONSE, &p); + } +} + // process RADIUS response void processrad(uint8_t *buf, int len, char socket_index) { - uint8_t b[MAXCONTROL]; - MD5_CTX ctx; + uint8_t b[MAXETHER]; uint16_t r; sessionidt s; tunnelidt t = 0; hasht hash; - uint8_t routes = 0; + int routes = 0; + int routes6 = 0; int r_code; int r_id; + int OpentunnelReq = 0; CSTAT(processrad); @@ -381,18 +562,14 @@ void processrad(uint8_t *buf, int len, char socket_index) LOG(1, s, session[s].tunnel, " Unexpected RADIUS response\n"); return; } - if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSSTART && radius[r].state != RADIUSSTOP) + if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSJUSTAUTH && radius[r].state != RADIUSSTART + && radius[r].state != RADIUSSTOP && radius[r].state != RADIUSINTERIM) { LOG(1, s, session[s].tunnel, " Unexpected RADIUS response\n"); return; } t = session[s].tunnel; - MD5Init(&ctx); - MD5Update(&ctx, buf, 4); - MD5Update(&ctx, radius[r].auth, 16); - MD5Update(&ctx, buf + 20, len - 20); - MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret)); - MD5Final(hash, &ctx); + calc_auth(buf, len, radius[r].auth, hash); do { if (memcmp(hash, buf + 4, 16)) { @@ -400,15 +577,15 @@ void processrad(uint8_t *buf, int len, char socket_index) return; // Do nothing. On timeout, it will try the next radius server. } - if ((radius[r].state == RADIUSAUTH && r_code != AccessAccept && r_code != AccessReject) || - ((radius[r].state == RADIUSSTART || radius[r].state == RADIUSSTOP) && r_code != AccountingResponse)) + if (((radius[r].state == RADIUSAUTH ||radius[r].state == RADIUSJUSTAUTH) && r_code != AccessAccept && r_code != AccessReject) || + ((radius[r].state == RADIUSSTART || radius[r].state == RADIUSSTOP || radius[r].state == RADIUSINTERIM) && r_code != AccountingResponse)) { LOG(1, s, session[s].tunnel, " Unexpected RADIUS response %s\n", radius_code(r_code)); 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) + if (radius[r].state == RADIUSAUTH || radius[r].state == RADIUSJUSTAUTH) { // run post-auth plugin struct param_post_auth packet = { @@ -422,46 +599,47 @@ void processrad(uint8_t *buf, int len, char socket_index) run_plugins(PLUGIN_POST_AUTH, &packet); r_code = packet.auth_allowed ? AccessAccept : AccessReject; - // process auth response - if (radius[r].chap) - { - // CHAP - uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPCHAP); - if (!p) return; // Abort! - - *p = (r_code == AccessAccept) ? 3 : 4; // ack/nak - p[1] = radius[r].id; - *(uint16_t *) (p + 2) = ntohs(4); // no message - tunnelsend(b, (p - b) + 4, t); // send it - - LOG(3, s, session[s].tunnel, " CHAP User %s authentication %s.\n", session[s].user, - (r_code == AccessAccept) ? "allowed" : "denied"); - } - else - { - // PAP - uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP); - if (!p) return; // Abort! - - // ack/nak - *p = r_code; - p[1] = radius[r].id; - *(uint16_t *) (p + 2) = ntohs(5); - p[4] = 0; // no message - tunnelsend(b, (p - b) + 5, t); // send it - - LOG(3, s, session[s].tunnel, " PAP User %s authentication %s.\n", session[s].user, - (r_code == AccessAccept) ? "allowed" : "denied"); - } - if (r_code == AccessAccept) { // Login successful // Extract IP, routes, etc uint8_t *p = buf + 20; uint8_t *e = buf + len; + uint8_t tag; + uint8_t strtemp[256]; + lac_reset_rad_tag_tunnel_ctxt(); + for (; p + 2 <= e && p[1] && p + p[1] <= e; p += p[1]) { + if (*p == 26 && p[1] >= 7) + { + // Vendor-Specific Attribute + uint32_t vendor = ntohl(*(int *)(p + 2)); + uint8_t attrib = *(p + 6); + int attrib_length = *(p + 7) - 2; + + LOG(4, s, session[s].tunnel, " Radius reply contains Vendor-Specific. Vendor=%u Attrib=%u Length=%d\n", vendor, attrib, attrib_length); + if (vendor == 9 && attrib == 1) // Cisco-AVPair + { + if (attrib_length < 0) continue; + LOG(3, s, session[s].tunnel, " Cisco-AVPair value: %.*s\n", + attrib_length, p + 8); + + handle_avpair(s, p + 8, attrib_length); + continue; + } + else if (vendor == 529 && attrib >= 135 && attrib <= 136) // Ascend + { + // handle old-format ascend DNS attributes below + p += 6; + } + else + { + LOG(3, s, session[s].tunnel, " Unknown vendor-specific\n"); + continue; + } + } + if (*p == 8) { // Framed-IP-Address @@ -470,6 +648,9 @@ void processrad(uint8_t *buf, int len, char socket_index) session[s].ip_pool_index = -1; LOG(3, s, session[s].tunnel, " Radius reply contains IP address %s\n", fmtaddr(htonl(session[s].ip), 0)); + + if (session[s].ip == 0xFFFFFFFE) + session[s].ip = 0; // assign from pool } else if (*p == 135) { @@ -490,7 +671,7 @@ void processrad(uint8_t *buf, int len, char socket_index) else if (*p == 22) { // Framed-Route - in_addr_t ip = 0, mask = 0; + in_addr_t ip = 0; uint8_t u = 0; uint8_t bits = 0; uint8_t *n = p + 2; @@ -512,14 +693,13 @@ void processrad(uint8_t *buf, int len, char socket_index) n++; while (n < e && isdigit(*n)) bits = bits * 10 + *n++ - '0'; - mask = (( -1) << (32 - bits)); } else if ((ip >> 24) < 128) - mask = 0xFF0000; + bits = 8; else if ((ip >> 24) < 192) - mask = 0xFFFF0000; + bits = 16; else - mask = 0xFFFFFF00; + bits = 24; if (routes == MAXROUTE) { @@ -527,97 +707,66 @@ void processrad(uint8_t *buf, int len, char socket_index) } else if (ip) { - LOG(3, s, session[s].tunnel, " Radius reply contains route for %s/%s\n", - fmtaddr(htonl(ip), 0), fmtaddr(htonl(mask), 1)); + LOG(3, s, session[s].tunnel, " Radius reply contains route for %s/%d\n", + fmtaddr(htonl(ip), 0), bits); session[s].route[routes].ip = ip; - session[s].route[routes].mask = mask; + session[s].route[routes].prefixlen = bits; routes++; } } else if (*p == 11) { // Filter-Id - char *filter = p + 2; + char *filter = (char *) p + 2; int l = p[1] - 2; char *suffix; - uint8_t *f = 0; - int i; + int f; + uint8_t *fp = 0; LOG(3, s, session[s].tunnel, " Radius reply contains Filter-Id \"%.*s\"\n", l, filter); if ((suffix = memchr(filter, '.', l))) { int b = suffix - filter; if (l - b == 3 && !memcmp("in", suffix+1, 2)) - f = &session[s].filter_in; + fp = &session[s].filter_in; else if (l - b == 4 && !memcmp("out", suffix+1, 3)) - f = &session[s].filter_out; + fp = &session[s].filter_out; l = b; } - if (!f) + if (!fp) { LOG(3, s, session[s].tunnel, " Invalid filter\n"); continue; } - for (*f = 0, i = 0; !*f && i < MAXFILTER; i++) - if (strlen(ip_filters[i].name) == l && - !strncmp(ip_filters[i].name, filter, l)) - *f = i + 1; - - if (*f) - ip_filters[*f - 1].used++; - else + if ((f = find_filter(filter, l)) < 0 || !*ip_filters[f].name) + { LOG(3, s, session[s].tunnel, " Unknown filter\n"); - - } - else if (*p == 26 && p[1] >= 7) - { - // Vendor-Specific Attribute - int vendor = ntohl(*(int *)(p + 2)); - char attrib = *(p + 6); - char attrib_length = *(p + 7) - 2; - char *avpair, *value, *key, *newp; - - LOG(3, s, session[s].tunnel, " Radius reply contains Vendor-Specific. Vendor=%d Attrib=%d Length=%d\n", vendor, attrib, attrib_length); - if (vendor != 9 || attrib != 1) + } + else { - LOG(3, s, session[s].tunnel, " Unknown vendor-specific\n"); - continue; + *fp = f + 1; + ip_filters[f].used++; } - - if (attrib_length < 0) continue; - - avpair = key = calloc(attrib_length + 1, 1); - memcpy(avpair, p + 8, attrib_length); - LOG(3, s, session[s].tunnel, " Cisco-Avpair value: %s\n", avpair); - do { - value = strchr(key, '='); - if (!value) break; - *value++ = 0; - - // Trim quotes off reply string - if (*value == '\'' || *value == '\"') - { - char *x; - value++; - x = value + strlen(value) - 1; - if (*x == '\'' || *x == '\"') - *x = 0; - } - - // Run hooks - newp = strchr(value, ','); - if (newp) *newp++ = 0; - { - struct param_radius_response p = { &tunnel[session[s].tunnel], &session[s], key, value }; - run_plugins(PLUGIN_RADIUS_RESPONSE, &p); - } - key = newp; - } while (newp); - free(avpair); + } + else if (*p == 27) + { + // Session-Timeout + if (p[1] < 6) continue; + session[s].session_timeout = ntohl(*(uint32_t *)(p + 2)); + LOG(3, s, session[s].tunnel, " Radius reply contains Session-Timeout = %u\n", session[s].session_timeout); + if(!session[s].session_timeout && config->kill_timedout_sessions) + sessionshutdown(s, "Session timeout is zero", CDN_ADMIN_DISC, 0); + } + else if (*p == 28) + { + // Idle-Timeout + if (p[1] < 6) continue; + session[s].idle_timeout = ntohl(*(uint32_t *)(p + 2)); + LOG(3, s, session[s].tunnel, " Radius reply contains Idle-Timeout = %u\n", session[s].idle_timeout); } else if (*p == 99) { @@ -626,10 +775,10 @@ void processrad(uint8_t *buf, int len, char socket_index) int prefixlen; uint8_t *n = p + 2; uint8_t *e = p + p[1]; - uint8_t *m = strchr(n, '/'); + uint8_t *m = memchr(n, '/', e - n); *m++ = 0; - inet_pton(AF_INET6, n, &r6); + inet_pton(AF_INET6, (char *) n, &r6); prefixlen = 0; while (m < e && isdigit(*m)) { @@ -638,36 +787,227 @@ void processrad(uint8_t *buf, int len, char socket_index) if (prefixlen) { - LOG(3, s, session[s].tunnel, - " Radius reply contains route for %s/%d\n", - n, prefixlen); - session[s].ipv6route = r6; - session[s].ipv6prefixlen = prefixlen; + if (routes6 == MAXROUTE6) + { + LOG(1, s, session[s].tunnel, " Too many IPv6 routes\n"); + } + else + { + LOG(3, s, session[s].tunnel, " Radius reply contains route for %s/%d\n", n, prefixlen); + session[s].route6[routes6].ipv6route = r6; + session[s].route6[routes6].ipv6prefixlen = prefixlen; + routes6++; + } + } + } + else if (*p == 123) + { + // Delegated-IPv6-Prefix + if ((p[1] > 4) && (p[3] > 0) && (p[3] <= 128)) + { + char ipv6addr[INET6_ADDRSTRLEN]; + + if (routes6 == MAXROUTE6) + { + LOG(1, s, session[s].tunnel, " Too many IPv6 routes\n"); + } + else + { + memcpy(&session[s].route6[routes6].ipv6route, &p[4], p[1] - 4); + session[s].route6[routes6].ipv6prefixlen = p[3]; + LOG(3, s, session[s].tunnel, " Radius reply contains Delegated IPv6 Prefix %s/%d\n", + inet_ntop(AF_INET6, &session[s].route6[routes6].ipv6route, ipv6addr, INET6_ADDRSTRLEN), session[s].route6[routes6].ipv6prefixlen); + routes6++; + } } } + else if (*p == 168) + { + // Framed-IPv6-Address + if (p[1] == 18) + { + char ipv6addr[INET6_ADDRSTRLEN]; + memcpy(&session[s].ipv6address, &p[2], 16); + LOG(3, s, session[s].tunnel, " Radius reply contains Framed-IPv6-Address %s\n", inet_ntop(AF_INET6, &session[s].ipv6address, ipv6addr, INET6_ADDRSTRLEN)); + } + } + else if (*p == 25) + { + // Class + if (p[1] < 3) continue; + session[s].classlen = p[1] - 2; + if (session[s].classlen > MAXCLASS) + session[s].classlen = MAXCLASS; + memcpy(session[s].class, p + 2, session[s].classlen); + } + else if (*p == 64) + { + // Tunnel-Type + if (p[1] != 6) continue; + tag = p[2]; + LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Type:%d %d\n", + tag, ntohl(*(uint32_t *)(p + 2)) & 0xFFFFFF); + // Fill context + lac_set_rad_tag_tunnel_type(tag, ntohl(*(uint32_t *)(p + 2)) & 0xFFFFFF); + /* Request open tunnel to remote LNS*/ + OpentunnelReq = 1; + } + else if (*p == 65) + { + // Tunnel-Medium-Type + if (p[1] < 6) continue; + tag = p[2]; + LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Medium-Type:%d %d\n", + tag, ntohl(*(uint32_t *)(p + 2)) & 0xFFFFFF); + // Fill context + lac_set_rad_tag_tunnel_medium_type(tag, ntohl(*(uint32_t *)(p + 2)) & 0xFFFFFF); + } + else if (*p == 67) + { + // Tunnel-Server-Endpoint + if (p[1] < 3) continue; + tag = p[2]; + //If the Tag field is greater than 0x1F, + // it SHOULD be interpreted as the first byte of the following String field. + memset(strtemp, 0, 256); + if (tag > 0x1F) + { + tag = 0; + memcpy(strtemp, (p + 2), p[1]-2); + } + else + memcpy(strtemp, (p + 3), p[1]-3); + + LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Server-Endpoint:%d %s\n", tag, strtemp); + // Fill context + lac_set_rad_tag_tunnel_serv_endpt(tag, (char *) strtemp); + } + else if (*p == 69) + { + // Tunnel-Password + size_t lentemp; + + if (p[1] < 5) continue; + tag = p[2]; + + memset(strtemp, 0, 256); + lentemp = p[1]-3; + memcpy(strtemp, (p + 3), lentemp); + if (!rad_tunnel_pwdecode(strtemp, &lentemp, config->radiussecret, radius[r].auth)) + { + LOG_HEX(3, "Error Decode Tunnel-Password, Dump Radius reponse:", p, p[1]); + continue; + } + + LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Password:%d %s\n", tag, strtemp); + if (strlen((char *) strtemp) > 63) + { + LOG(1, s, session[s].tunnel, "tunnel password is too long (>63)\n"); + continue; + } + // Fill context + lac_set_rad_tag_tunnel_password(tag, (char *) strtemp); + } + else if (*p == 82) + { + // Tunnel-Assignment-Id + if (p[1] < 3) continue; + tag = p[2]; + //If the Tag field is greater than 0x1F, + // it SHOULD be interpreted as the first byte of the following String field. + memset(strtemp, 0, 256); + if (tag > 0x1F) + { + tag = 0; + memcpy(strtemp, (p + 2), p[1]-2); + } + else + memcpy(strtemp, (p + 3), p[1]-3); + + LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Assignment-Id:%d %s\n", tag, strtemp); + // Fill context + lac_set_rad_tag_tunnel_assignment_id(tag, (char *) strtemp); + } } } else if (r_code == AccessReject) { - LOG(2, s, session[s].tunnel, " Authentication denied for %s\n", session[s].user); - sessionshutdown(s, "Authentication denied"); + LOG(2, s, session[s].tunnel, " Authentication rejected for %s\n", session[s].user); + sessionkill(s, "Authentication rejected"); break; } + if ((!config->disable_lac_func) && OpentunnelReq) + { + char assignment_id[256]; + // Save radius tag context to conf + lac_save_rad_tag_tunnels(s); + + memset(assignment_id, 0, 256); + if (!lac_rad_select_assignment_id(s, assignment_id)) + break; // Error no assignment_id + + LOG(3, s, session[s].tunnel, "Select Tunnel Remote LNS for assignment_id == %s\n", assignment_id); + + if (lac_rad_forwardtoremotelns(s, assignment_id, session[s].user)) + { + int ro; + // Sanity check, no local IP to session forwarded + session[s].ip = 0; + for (ro = 0; r < MAXROUTE && session[s].route[ro].ip; r++) + { + session[s].route[ro].ip = 0; + } + break; + } + } + + // process auth response + if (radius[r].chap) + { + // CHAP + uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP, 0, 0, 0); + if (!p) return; // Abort! + + *p = (r_code == AccessAccept) ? 3 : 4; // ack/nak + p[1] = radius[r].id; + *(uint16_t *) (p + 2) = ntohs(4); // no message + tunnelsend(b, (p - b) + 4, t); // send it + + LOG(3, s, session[s].tunnel, " CHAP User %s authentication %s.\n", session[s].user, + (r_code == AccessAccept) ? "allowed" : "denied"); + } + else + { + // PAP + uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP, 0, 0, 0); + if (!p) return; // Abort! + + // ack/nak + *p = r_code; + p[1] = radius[r].id; + *(uint16_t *) (p + 2) = ntohs(5); + p[4] = 0; // no message + tunnelsend(b, (p - b) + 5, t); // send it + + LOG(3, s, session[s].tunnel, " PAP User %s authentication %s.\n", session[s].user, + (r_code == AccessAccept) ? "allowed" : "denied"); + } + if (!session[s].dns1 && config->default_dns1) { - session[s].dns1 = htonl(config->default_dns1); + session[s].dns1 = ntohl(config->default_dns1); LOG(3, s, t, " Sending dns1 = %s\n", fmtaddr(config->default_dns1, 0)); } if (!session[s].dns2 && config->default_dns2) { - session[s].dns2 = htonl(config->default_dns2); + session[s].dns2 = ntohl(config->default_dns2); LOG(3, s, t, " Sending dns2 = %s\n", fmtaddr(config->default_dns2, 0)); } // Valid Session, set it up session[s].unique_id = 0; - sessionsetup(t, s); + sessionsetup(s, t); } else { @@ -691,30 +1031,399 @@ void radiusretry(uint16_t r) if (s) t = session[s].tunnel; - 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); + case RADIUSCHAP: // sending CHAP down PPP + sendchap(s, t); break; - case RADIUSSTART: // sending start accounting to RADIUS server - radiussend(r, RADIUSSTART); - break; - case RADIUSSTOP: // sending stop accounting to RADIUS server - radiussend(r, RADIUSSTOP); + case RADIUSAUTH: // sending auth to RADIUS server + case RADIUSJUSTAUTH: // sending auth to RADIUS server + case RADIUSSTART: // sending start accounting to RADIUS server + case RADIUSSTOP: // sending stop accounting to RADIUS server + case RADIUSINTERIM: // sending interim accounting to RADIUS server + radiussend(r, radius[r].state); break; default: - case RADIUSNULL: // Not in use - case RADIUSWAIT: // waiting timeout before available, in case delayed reply from RADIUS server + 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, s, session[s].tunnel, "Freeing up radius session %d\n", r); break; } } + +extern int daefd; + +void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local) +{ + int i, r_code, r_id, length, attribute_length; + uint8_t *packet, attribute; + hasht hash; + char username[MAXUSER] = ""; + in_addr_t nas = 0; + in_addr_t ip = 0; + uint32_t port = 0; + uint32_t error = 0; + sessionidt s = 0; + tunnelidt t; + int fin = -1; + int fout = -1; + uint8_t *avpair[64]; + int avpair_len[sizeof(avpair)/sizeof(*avpair)]; + int avp = 0; + int auth_only = 0; + uint8_t *p; + + LOG(3, 0, 0, "DAE request from %s\n", fmtaddr(addr->sin_addr.s_addr, 0)); + LOG_HEX(5, "DAE Request", buf, len); + + if (len < 20 || len < ntohs(*(uint16_t *) (buf + 2))) + { + LOG(1, 0, 0, "Duff DAE request length %d\n", len); + return; + } + + r_code = buf[0]; // request type + r_id = buf[1]; // radius indentifier. + + if (r_code != DisconnectRequest && r_code != CoARequest) + { + LOG(1, 0, 0, "Unrecognised DAE request %s\n", radius_code(r_code)); + return; + } + + if (!config->cluster_iam_master) + { + master_forward_dae_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); + return; + } + + len = ntohs(*(uint16_t *) (buf + 2)); + + LOG(3, 0, 0, "Received DAE %s, id %d\n", radius_code(r_code), r_id); + + // check authenticator + calc_auth(buf, len, zero, hash); + if (memcmp(hash, buf + 4, 16) != 0) + { + LOG(1, 0, 0, "Incorrect vector in DAE request (wrong secret in radius config?)\n"); + return; + } + + // unpack attributes + packet = buf + 20; + length = len - 20; + + while (length > 0) + { + attribute = *packet++; + attribute_length = *packet++; + if (attribute_length < 2) + break; + + length -= attribute_length; + attribute_length -= 2; + switch (attribute) + { + case 1: /* username */ + len = attribute_length < MAXUSER ? attribute_length : MAXUSER - 1; + memcpy(username, packet, len); + username[len] = 0; + LOG(4, 0, 0, " Received DAE User-Name: %s\n", username); + break; + + case 4: /* nas ip address */ + nas = *(uint32_t *) packet; // net order + if (nas != config->bind_address) + error = 403; // NAS identification mismatch + + LOG(4, 0, 0, " Received DAE NAS-IP-Address: %s\n", fmtaddr(nas, 0)); + break; + + case 5: /* nas port */ + port = ntohl(*(uint32_t *) packet); + if (port < 1 || port > MAXSESSION) + error = 404; + + LOG(4, 0, 0, " Received DAE NAS-Port: %u\n", port); + break; + + case 6: /* service type */ + { + uint32_t service_type = ntohl(*(uint32_t *) packet); + auth_only = service_type == 8; // Authenticate only + + LOG(4, 0, 0, " Received DAE Service-Type: %u\n", service_type); + } + break; + + case 8: /* ip address */ + ip = *(uint32_t *) packet; // net order + LOG(4, 0, 0, " Received DAE Framed-IP-Address: %s\n", fmtaddr(ip, 0)); + break; + + case 11: /* filter id */ + LOG(4, 0, 0, " Received DAE Filter-Id: %.*s\n", attribute_length, packet); + if (!(p = memchr(packet, '.', attribute_length))) + { + error = 404; // invalid request + break; + } + + len = p - packet; + i = find_filter((char *) packet, len); + if (i < 0 || !*ip_filters[i].name) + { + error = 404; + break; + } + + if (!memcmp(p, ".in", attribute_length - len)) + fin = i + 1; + else if (!memcmp(p, ".out", attribute_length - len)) + fout = i + 1; + else + error = 404; + + break; + + case 26: /* vendor specific */ + if (attribute_length >= 6 + && ntohl(*(uint32_t *) packet) == 9 // Cisco + && *(packet + 4) == 1 // Cisco-AVPair + && *(packet + 5) >= 2) // length + { + int len = *(packet + 5) - 2; + uint8_t *a = packet + 6; + + LOG(4, 0, 0, " Received DAE Cisco-AVPair: %.*s\n", len, a); + if (avp < sizeof(avpair)/sizeof(*avpair) - 1) + { + avpair[avp] = a; + avpair_len[avp++] = len; + } + } + break; + } + + packet += attribute_length; + } + + if (!error && auth_only) + { + if (fin != -1 || fout != -1 || avp) + error = 401; // unsupported attribute + else + error = 405; // unsupported service + } + + if (!error && !(port || ip || *username)) + error = 402; // missing attribute + + // exact match for SID if given + if (!error && port) + { + s = port; + if (!session[s].opened) + error = 503; // not found + } + + if (!error && ip) + { + // find/check session by IP + i = sessionbyip(ip); + if (!i || (s && s != i)) // not found or mismatching port + error = 503; + else + s = i; + } + + if (!error && *username) + { + if (s) + { + if (strcmp(session[s].user, username)) + error = 503; + } + else if (!(s = sessionbyuser(username))) + error = 503; + } + + t = session[s].tunnel; + + switch (r_code) + { + case DisconnectRequest: // Packet of Disconnect/Death + if (error) + { + r_code = DisconnectNAK; + break; + } + + LOG(3, s, t, " DAE Disconnect %d (%s)\n", s, session[s].user); + r_code = DisconnectACK; + + sessionshutdown(s, "Requested by PoD", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // disconnect session + break; + + case CoARequest: // Change of Authorization + if (error) + { + r_code = CoANAK; + break; + } + + LOG(3, s, t, " DAE Change %d (%s)\n", s, session[s].user); + r_code = CoAACK; + + // reset + { + struct param_radius_reset p = { &tunnel[session[s].tunnel], &session[s] }; + run_plugins(PLUGIN_RADIUS_RESET, &p); + } + + // apply filters + if (fin == -1) + fin = 0; + else + LOG(3, s, t, " Filter in %d (%s)\n", fin, ip_filters[fin - 1].name); + + if (fout == -1) + fout = 0; + else + LOG(3, s, t, " Filter out %d (%s)\n", fout, ip_filters[fout - 1].name); + + filter_session(s, fin, fout); + + // process cisco av-pair(s) + for (i = 0; i < avp; i++) + { + LOG(3, s, t, " Cisco-AVPair: %.*s\n", avpair_len[i], avpair[i]); + handle_avpair(s, avpair[i], avpair_len[i]); + } + + cluster_send_session(s); + break; + } + + // send response + packet = buf; + *packet++ = r_code; + *packet++ = r_id; + // skip len + auth + packet += 2 + 16; + len = packet - buf; + + // add attributes + if (error) + { + // add error cause + *packet++ = 101; + *packet++ = 6; + *(uint32_t *) packet = htonl(error); + len += 6; + } + + *((uint16_t *)(buf + 2)) = htons(len); + + // make vector + calc_auth(buf, len, hash, buf + 4); + + LOG(3, 0, 0, "Sending DAE %s, id=%d\n", radius_code(r_code), r_id); + + // send DAE response + if (sendtofrom(daefd, buf, len, MSG_DONTWAIT | MSG_NOSIGNAL, (struct sockaddr *) addr, alen, local) < 0) + LOG(0, 0, 0, "Error sending DAE response packet: %s\n", strerror(errno)); +} + +// Decrypte the encrypted Tunnel Password. +// Defined in RFC-2868. +// the pl2tpsecret buffer must set to 256 characters. +// return 0 on decoding error else length of decoded l2tpsecret +int rad_tunnel_pwdecode(uint8_t *pl2tpsecret, size_t *pl2tpsecretlen, + const char *radiussecret, const uint8_t * auth) +{ + MD5_CTX ctx, oldctx; + hasht hash; + int secretlen; + unsigned i, n, len, decodedlen; + +/* 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 6 7 +* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Salt | Salt | String .......... + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+*/ + + len = *pl2tpsecretlen; + + if (len < 2) + { + LOG(1, 0, 0, "tunnel password is too short, We need at least a salt\n"); + return 0; + } + + if (len <= 3) + { + pl2tpsecret[0] = 0; + *pl2tpsecretlen = 0; + LOG(1, 0, 0, "tunnel passwd is empty !!!\n"); + return 0; + } + + len -= 2; /* discount the salt */ + + //Use the secret to setup the decryption + secretlen = strlen(radiussecret); + + MD5_Init(&ctx); + MD5_Update(&ctx, (void *) radiussecret, secretlen); + oldctx = ctx; /* save intermediate work */ + + // Set up the initial key: + // b(1) = MD5(radiussecret + auth + salt) + MD5_Update(&ctx, (void *) auth, 16); + MD5_Update(&ctx, pl2tpsecret, 2); + + decodedlen = 0; + for (n = 0; n < len; n += 16) + { + int base = 0; + + if (n == 0) + { + MD5_Final(hash, &ctx); + + ctx = oldctx; + + // the first octet, it's the 'data_len' + // Check is correct + decodedlen = pl2tpsecret[2] ^ hash[0]; + if (decodedlen >= len) + { + LOG(1, 0, 0, "tunnel password is too long !!!\n"); + return 0; + } + + MD5_Update(&ctx, pl2tpsecret + 2, 16); + base = 1; + } else + { + MD5_Final(hash, &ctx); + + ctx = oldctx; + MD5_Update(&ctx, pl2tpsecret + n + 2, 16); + } + + for (i = base; i < 16; i++) + { + pl2tpsecret[n + i - 1] = pl2tpsecret[n + i + 2] ^ hash[i]; + } + } + + if (decodedlen > 239) decodedlen = 239; + + *pl2tpsecretlen = decodedlen; + pl2tpsecret[decodedlen] = 0; + + return decodedlen; +};