X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/983b38e12f2ba4afcb8046835f3e3c158b6435c3..bda0151354ac2fbeff56ba8c934d1c3de6cc1898:/radius.c diff --git a/radius.c b/radius.c index 6a206ea..690380f 100644 --- a/radius.c +++ b/radius.c @@ -1,6 +1,6 @@ // L2TPNS Radius Stuff -char const *cvs_id_radius = "$Id: radius.c,v 1.24 2005-02-14 06:58:39 bodea Exp $"; +char const *cvs_id_radius = "$Id: radius.c,v 1.36 2005-06-30 14:31:26 bodea Exp $"; #include #include @@ -12,11 +12,13 @@ char const *cvs_id_radius = "$Id: radius.c,v 1.24 2005-02-14 06:58:39 bodea Exp #include #include #include +#include #include "md5.h" #include "constants.h" #include "l2tpns.h" #include "plugin.h" #include "util.h" +#include "cluster.h" extern radiust *radius; extern sessiont *session; @@ -29,9 +31,9 @@ extern ip_filtert *ip_filters; 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++) + 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); @@ -42,7 +44,7 @@ void initrad(void) 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 +53,7 @@ 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 +71,7 @@ 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 +88,13 @@ 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; } @@ -130,7 +134,7 @@ 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); @@ -140,7 +144,7 @@ void radiussend(uint16_t r, uint8_t state) if (s) { if (state == RADIUSAUTH) - sessionshutdown(s, "RADIUS timeout"); + sessionshutdown(s, "RADIUS timeout.", 3, 0); else { LOG(1, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n", @@ -161,11 +165,12 @@ void radiussend(uint16_t r, uint8_t state) switch (state) { case RADIUSAUTH: - b[0] = 1; // access request + 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); @@ -229,46 +234,75 @@ void radiussend(uint16_t r, uint8_t state) p += p[1]; } } - else if (state == RADIUSSTART || state == RADIUSSTOP) - { // accounting - *p = 40; // accounting type + else if (state == RADIUSSTART || state == RADIUSSTOP || state == RADIUSINTERIM) + { // 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(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(session[s].cin); + *(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened); p += p[1]; - *p = 43; // output octets + 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].cout); + *(uint32_t *) (p + 2) = htonl(session[s].cin); p += p[1]; - *p = 46; // session time + + *p = 43; // output octets p[1] = 6; - *(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened); + *(uint32_t *) (p + 2) = htonl(session[s].cout); p += p[1]; - *p = 47; // input packets + if (state == RADIUSSTOP) + { + *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[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 (session[s].snoop_ip && session[s].snoop_port) + { + *p = 26; // vendor-specific + *(uint32_t *) (p + 2) = htonl(9); // Cisco + p[6] = 1; // Cisco-AVPair + p[7] = 2 + sprintf(p + 8, "intercept=%s:%d", + fmtaddr(session[s].snoop_ip, 0), session[s].snoop_port); + + p[1] = p[7] + 6; p += p[1]; } } @@ -345,6 +379,47 @@ void radiussend(uint16_t r, uint8_t state) sendto(radfds[r & RADIUS_MASK], b, p - b, 0, (void *) &addr, sizeof(addr)); } +static void handle_avpair(sessionidt s, uint8_t *avp, int len) +{ + char *key = avp; + char *value = memchr(avp, '=', len); + char 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], key, value }; + run_plugins(PLUGIN_RADIUS_RESPONSE, &p); + } +} + // process RADIUS response void processrad(uint8_t *buf, int len, char socket_index) { @@ -381,7 +456,8 @@ 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 != RADIUSSTART + && radius[r].state != RADIUSSTOP && radius[r].state != RADIUSINTERIM) { LOG(1, s, session[s].tunnel, " Unexpected RADIUS response\n"); return; @@ -401,7 +477,7 @@ void processrad(uint8_t *buf, int len, char socket_index) } if ((radius[r].state == RADIUSAUTH && r_code != AccessAccept && r_code != AccessReject) || - ((radius[r].state == RADIUSSTART || radius[r].state == RADIUSSTOP) && r_code != AccountingResponse)) + ((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 @@ -544,45 +620,43 @@ void processrad(uint8_t *buf, int len, char socket_index) char *filter = 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 + { + *fp = f + 1; + ip_filters[f].used++; + } } 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; + int attrib_length = *(p + 7) - 2; 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) @@ -591,36 +665,13 @@ void processrad(uint8_t *buf, int len, char socket_index) continue; } - 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; - } + if (attrib_length > 0) + { + LOG(3, s, session[s].tunnel, " Cisco-AVPair value: %.*s\n", + attrib_length, p + 8); - // 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); + handle_avpair(s, p + 8, attrib_length); + } } else if (*p == 99) { @@ -694,30 +745,333 @@ 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 + case RADIUSCHAP: // sending CHAP down PPP sendchap(t, s); break; case RADIUSIPCP: - sendipcp(t, s); // send IPCP + sendipcp(t, s); // send IPCP break; - case RADIUSAUTH: // sending auth to RADIUS server + case RADIUSAUTH: // sending auth to RADIUS server radiussend(r, RADIUSAUTH); break; - case RADIUSSTART: // sending start accounting to RADIUS server + case RADIUSSTART: // sending start accounting to RADIUS server radiussend(r, RADIUSSTART); break; - case RADIUSSTOP: // sending stop accounting to RADIUS server + case RADIUSSTOP: // sending stop accounting to RADIUS server radiussend(r, RADIUSSTOP); break; + case RADIUSINTERIM: // sending interim accounting to RADIUS server + radiussend(r, RADIUSINTERIM); + 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) +{ + int i, r_code, r_id, length, attribute_length; + uint8_t vector[16], hash[16], *packet, attribute; + MD5_CTX ctx; + 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 + memcpy(vector, buf + 4, 16); + memset(buf + 4, 0, 16); + + i = strlen(config->radiussecret); + if (i > 16) i = 16; + + MD5Init(&ctx); + MD5Update(&ctx, buf, len); + MD5Update(&ctx, buf, config->radiussecret, i); + MD5Final(hash, &ctx); + if (memcmp(hash, vector, 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(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", 3, 0); // 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; + packet += 2; + memset(packet, 0, 16); + packet += 16; + len = 20; + + // 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 + i = strlen(config->radiussecret); + if (i > 16) i = 16; + + MD5Init(&ctx); + MD5Update(&ctx, buf, len); + MD5Update(&ctx, config->radiussecret, i); + MD5Final(hash, &ctx); + memcpy(buf + 4, hash, 16); + + LOG(3, 0, 0, "Sending DAE %s, id=%d\n", radius_code(r_code), r_id); + + // send DAE response + if (sendto(daefd, buf, len, MSG_DONTWAIT | MSG_NOSIGNAL, (struct sockaddr *) addr, alen) < 0) + LOG(0, 0, 0, "Error sending DAE response packet: %s\n", strerror(errno)); +}