/* * Copyright (C) 2006, 2007 Stig Venaas * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. */ /* For UDP there is one server instance consisting of udpserverrd and udpserverth * rd is responsible for init and launching wr * For TLS there is a server instance that launches tlsserverrd for each TLS peer * each tlsserverrd launches tlsserverwr * For each UDP/TLS peer there is clientrd and clientwr, clientwr is responsible * for init and launching rd * * serverrd will receive a request, processes it and puts it in the requestq of * the appropriate clientwr * clientwr monitors its requestq and sends requests * clientrd looks for responses, processes them and puts them in the replyq of * the peer the request came from * serverwr monitors its reply and sends replies * * In addition to the main thread, we have: * If UDP peers are configured, there will be 2 + 2 * #peers UDP threads * If TLS peers are configured, there will initially be 2 * #peers TLS threads * For each TLS peer connecting to us there will be 2 more TLS threads * This is only for connected peers * Example: With 3 UDP peer and 30 TLS peers, there will be a max of * 1 + (2 + 2 * 3) + (2 * 30) + (2 * 30) = 129 threads */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "debug.h" #include "radsecproxy.h" static struct options options; static struct client *clients = NULL; static struct server *servers = NULL; static struct realm *realms = NULL; static struct tls *tls = NULL; static int client_udp_count = 0; static int client_tls_count = 0; static int client_count = 0; static int server_udp_count = 0; static int server_tls_count = 0; static int server_count = 0; static int realm_count = 0; static int tls_count = 0; static struct peer *tcp_server_listen; static struct peer *udp_server_listen; static struct replyq udp_server_replyq; static int udp_server_sock = -1; static pthread_mutex_t *ssl_locks; static long *ssl_lock_count; extern int optind; extern char *optarg; /* callbacks for making OpenSSL thread safe */ unsigned long ssl_thread_id() { return (unsigned long)pthread_self(); } void ssl_locking_callback(int mode, int type, const char *file, int line) { if (mode & CRYPTO_LOCK) { pthread_mutex_lock(&ssl_locks[type]); ssl_lock_count[type]++; } else pthread_mutex_unlock(&ssl_locks[type]); } static int pem_passwd_cb(char *buf, int size, int rwflag, void *userdata) { int pwdlen = strlen(userdata); if (rwflag != 0 || pwdlen > size) /* not for decryption or too large */ return 0; memcpy(buf, userdata, pwdlen); return pwdlen; } static int verify_cb(int ok, X509_STORE_CTX *ctx) { char buf[256]; X509 *err_cert; int err, depth; err_cert = X509_STORE_CTX_get_current_cert(ctx); err = X509_STORE_CTX_get_error(ctx); depth = X509_STORE_CTX_get_error_depth(ctx); if (depth > MAX_CERT_DEPTH) { ok = 0; err = X509_V_ERR_CERT_CHAIN_TOO_LONG; X509_STORE_CTX_set_error(ctx, err); } if (!ok) { X509_NAME_oneline(X509_get_subject_name(err_cert), buf, 256); debug(DBG_WARN, "verify error: num=%d:%s:depth=%d:%s", err, X509_verify_cert_error_string(err), depth, buf); switch (err) { case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), buf, 256); debug(DBG_WARN, "\tIssuer=%s", buf); break; case X509_V_ERR_CERT_NOT_YET_VALID: case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: debug(DBG_WARN, "\tCertificate not yet valid"); break; case X509_V_ERR_CERT_HAS_EXPIRED: debug(DBG_WARN, "Certificate has expired"); break; case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: debug(DBG_WARN, "Certificate no longer valid (after notAfter)"); break; } } #ifdef DEBUG printf("certificate verify returns %d\n", ok); #endif return ok; } #ifdef DEBUG void printauth(char *s, unsigned char *t) { int i; printf("%s:", s); for (i = 0; i < 16; i++) printf("%02x ", t[i]); printf("\n"); } #endif int resolvepeer(struct peer *peer, int ai_flags) { struct addrinfo hints, *addrinfo; memset(&hints, 0, sizeof(hints)); hints.ai_socktype = (peer->type == 'T' ? SOCK_STREAM : SOCK_DGRAM); hints.ai_family = AF_UNSPEC; hints.ai_flags = ai_flags; if (getaddrinfo(peer->host, peer->port, &hints, &addrinfo)) { debug(DBG_WARN, "resolvepeer: can't resolve %s port %s", peer->host, peer->port); return 0; } if (peer->addrinfo) freeaddrinfo(peer->addrinfo); peer->addrinfo = addrinfo; return 1; } int connecttoserver(struct addrinfo *addrinfo) { int s; struct addrinfo *res; s = -1; for (res = addrinfo; res; res = res->ai_next) { s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); if (s < 0) { debug(DBG_WARN, "connecttoserver: socket failed"); continue; } if (connect(s, res->ai_addr, res->ai_addrlen) == 0) break; debug(DBG_WARN, "connecttoserver: connect failed"); close(s); s = -1; } return s; } int bindtoaddr(struct addrinfo *addrinfo) { int s, on = 1; struct addrinfo *res; for (res = addrinfo; res; res = res->ai_next) { s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); if (s < 0) { debug(DBG_WARN, "bindtoaddr: socket failed"); continue; } setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); if (!bind(s, res->ai_addr, res->ai_addrlen)) return s; debug(DBG_WARN, "bindtoaddr: bind failed"); close(s); } return -1; } /* returns the client with matching address, or NULL */ /* if client argument is not NULL, we only check that one client */ struct client *find_client(char type, struct sockaddr *addr, struct client *client) { struct sockaddr_in6 *sa6 = NULL; struct in_addr *a4 = NULL; struct client *c; int i; struct addrinfo *res; if (addr->sa_family == AF_INET6) { sa6 = (struct sockaddr_in6 *)addr; if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) a4 = (struct in_addr *)&sa6->sin6_addr.s6_addr[12]; } else a4 = &((struct sockaddr_in *)addr)->sin_addr; c = (client ? client : clients); for (i = 0; i < client_count; i++) { if (c->peer.type == type) for (res = c->peer.addrinfo; res; res = res->ai_next) if ((a4 && res->ai_family == AF_INET && !memcmp(a4, &((struct sockaddr_in *)res->ai_addr)->sin_addr, 4)) || (sa6 && res->ai_family == AF_INET6 && !memcmp(&sa6->sin6_addr, &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr, 16))) return c; if (client) break; c++; } return NULL; } /* returns the server with matching address, or NULL */ /* if server argument is not NULL, we only check that one server */ struct server *find_server(char type, struct sockaddr *addr, struct server *server) { struct sockaddr_in6 *sa6 = NULL; struct in_addr *a4 = NULL; struct server *s; int i; struct addrinfo *res; if (addr->sa_family == AF_INET6) { sa6 = (struct sockaddr_in6 *)addr; if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) a4 = (struct in_addr *)&sa6->sin6_addr.s6_addr[12]; } else a4 = &((struct sockaddr_in *)addr)->sin_addr; s = (server ? server : servers); for (i = 0; i < server_count; i++) { if (s->peer.type == type) for (res = s->peer.addrinfo; res; res = res->ai_next) if ((a4 && res->ai_family == AF_INET && !memcmp(a4, &((struct sockaddr_in *)res->ai_addr)->sin_addr, 4)) || (sa6 && res->ai_family == AF_INET6 && !memcmp(&sa6->sin6_addr, &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr, 16))) return s; if (server) break; s++; } return NULL; } /* exactly one of client and server must be non-NULL */ /* if *peer == NULL we return who we received from, else require it to be from peer */ /* return from in sa if not NULL */ unsigned char *radudpget(int s, struct client **client, struct server **server, struct sockaddr_storage *sa) { int cnt, len; void *f; unsigned char buf[65536], *rad; struct sockaddr_storage from; socklen_t fromlen = sizeof(from); for (;;) { cnt = recvfrom(s, buf, sizeof(buf), 0, (struct sockaddr *)&from, &fromlen); if (cnt == -1) { debug(DBG_WARN, "radudpget: recv failed"); continue; } debug(DBG_DBG, "radudpget: got %d bytes from %s", cnt, addr2string((struct sockaddr *)&from, fromlen)); if (cnt < 20) { debug(DBG_WARN, "radudpget: packet too small"); continue; } len = RADLEN(buf); if (len < 20) { debug(DBG_WARN, "radudpget: length too small"); continue; } if (cnt < len) { debug(DBG_WARN, "radudpget: packet smaller than length field in radius header"); continue; } if (cnt > len) debug(DBG_DBG, "radudpget: packet was padded with %d bytes", cnt - len); f = (client ? (void *)find_client('U', (struct sockaddr *)&from, *client) : (void *)find_server('U', (struct sockaddr *)&from, *server)); if (!f) { debug(DBG_WARN, "radudpget: got packet from wrong or unknown UDP peer, ignoring"); continue; } rad = malloc(len); if (rad) break; debug(DBG_ERR, "radudpget: malloc failed"); } memcpy(rad, buf, len); if (client) *client = (struct client *)f; /* only need this if *client == NULL, but if not NULL *client == f here */ else *server = (struct server *)f; /* only need this if *server == NULL, but if not NULL *server == f here */ if (sa) *sa = from; return rad; } int tlsverifycert(struct peer *peer) { int l, loc; X509 *cert; X509_NAME *nm; X509_NAME_ENTRY *e; unsigned char *v; unsigned long error; if (SSL_get_verify_result(peer->ssl) != X509_V_OK) { debug(DBG_ERR, "tlsverifycert: basic validation failed"); while ((error = ERR_get_error())) debug(DBG_ERR, "tlsverifycert: TLS: %s", ERR_error_string(error, NULL)); return 0; } cert = SSL_get_peer_certificate(peer->ssl); if (!cert) { debug(DBG_ERR, "tlsverifycert: failed to obtain certificate"); return 0; } nm = X509_get_subject_name(cert); loc = -1; for (;;) { loc = X509_NAME_get_index_by_NID(nm, NID_commonName, loc); if (loc == -1) break; e = X509_NAME_get_entry(nm, loc); l = ASN1_STRING_to_UTF8(&v, X509_NAME_ENTRY_get_data(e)); if (l < 0) continue; #ifdef DEBUG { int i; printf("cn: "); for (i = 0; i < l; i++) printf("%c", v[i]); printf("\n"); } #endif if (l == strlen(peer->host) && !strncasecmp(peer->host, (char *)v, l)) { debug(DBG_DBG, "tlsverifycert: Found cn matching host %s, All OK", peer->host); return 1; } debug(DBG_ERR, "tlsverifycert: cn not matching host %s", peer->host); } X509_free(cert); return 0; } void tlsconnect(struct server *server, struct timeval *when, char *text) { struct timeval now; time_t elapsed; debug(DBG_DBG, "tlsconnect called from %s", text); pthread_mutex_lock(&server->lock); if (when && memcmp(&server->lastconnecttry, when, sizeof(struct timeval))) { /* already reconnected, nothing to do */ debug(DBG_DBG, "tlsconnect(%s): seems already reconnected", text); pthread_mutex_unlock(&server->lock); return; } debug(DBG_DBG, "tlsconnect %s", text); for (;;) { gettimeofday(&now, NULL); elapsed = now.tv_sec - server->lastconnecttry.tv_sec; if (server->connectionok) { server->connectionok = 0; sleep(10); } else if (elapsed < 5) sleep(10); else if (elapsed < 300) { debug(DBG_INFO, "tlsconnect: sleeping %lds", elapsed); sleep(elapsed); } else if (elapsed < 100000) { debug(DBG_INFO, "tlsconnect: sleeping %ds", 600); sleep(600); } else server->lastconnecttry.tv_sec = now.tv_sec; /* no sleep at startup */ debug(DBG_WARN, "tlsconnect: trying to open TLS connection to %s port %s", server->peer.host, server->peer.port); if (server->sock >= 0) close(server->sock); if ((server->sock = connecttoserver(server->peer.addrinfo)) < 0) { debug(DBG_ERR, "tlsconnect: connecttoserver failed"); continue; } SSL_free(server->peer.ssl); server->peer.ssl = SSL_new(server->peer.ssl_ctx); SSL_set_fd(server->peer.ssl, server->sock); if (SSL_connect(server->peer.ssl) > 0 && tlsverifycert(&server->peer)) break; } debug(DBG_WARN, "tlsconnect: TLS connection to %s port %s up", server->peer.host, server->peer.port); gettimeofday(&server->lastconnecttry, NULL); pthread_mutex_unlock(&server->lock); } unsigned char *radtlsget(SSL *ssl) { int cnt, total, len; unsigned char buf[4], *rad; for (;;) { for (total = 0; total < 4; total += cnt) { cnt = SSL_read(ssl, buf + total, 4 - total); if (cnt <= 0) { debug(DBG_ERR, "radtlsget: connection lost"); if (SSL_get_error(ssl, cnt) == SSL_ERROR_ZERO_RETURN) { /* remote end sent close_notify, send one back */ SSL_shutdown(ssl); } return NULL; } } len = RADLEN(buf); rad = malloc(len); if (!rad) { debug(DBG_ERR, "radtlsget: malloc failed"); continue; } memcpy(rad, buf, 4); for (; total < len; total += cnt) { cnt = SSL_read(ssl, rad + total, len - total); if (cnt <= 0) { debug(DBG_ERR, "radtlsget: connection lost"); if (SSL_get_error(ssl, cnt) == SSL_ERROR_ZERO_RETURN) { /* remote end sent close_notify, send one back */ SSL_shutdown(ssl); } free(rad); return NULL; } } if (total >= 20) break; free(rad); debug(DBG_WARN, "radtlsget: packet smaller than minimum radius size"); } debug(DBG_DBG, "radtlsget: got %d bytes", total); return rad; } int clientradput(struct server *server, unsigned char *rad) { int cnt; size_t len; unsigned long error; struct timeval lastconnecttry; len = RADLEN(rad); if (server->peer.type == 'U') { if (send(server->sock, rad, len, 0) >= 0) { debug(DBG_DBG, "clienradput: sent UDP of length %d to %s port %s", len, server->peer.host, server->peer.port); return 1; } debug(DBG_WARN, "clientradput: send failed"); return 0; } lastconnecttry = server->lastconnecttry; while ((cnt = SSL_write(server->peer.ssl, rad, len)) <= 0) { while ((error = ERR_get_error())) debug(DBG_ERR, "clientradput: TLS: %s", ERR_error_string(error, NULL)); tlsconnect(server, &lastconnecttry, "clientradput"); lastconnecttry = server->lastconnecttry; } server->connectionok = 1; debug(DBG_DBG, "clientradput: Sent %d bytes, Radius packet of length %d to TLS peer %s", cnt, len, server->peer.host); return 1; } int radsign(unsigned char *rad, unsigned char *sec) { static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; static unsigned char first = 1; static EVP_MD_CTX mdctx; unsigned int md_len; int result; pthread_mutex_lock(&lock); if (first) { EVP_MD_CTX_init(&mdctx); first = 0; } result = (EVP_DigestInit_ex(&mdctx, EVP_md5(), NULL) && EVP_DigestUpdate(&mdctx, rad, RADLEN(rad)) && EVP_DigestUpdate(&mdctx, sec, strlen((char *)sec)) && EVP_DigestFinal_ex(&mdctx, rad + 4, &md_len) && md_len == 16); pthread_mutex_unlock(&lock); return result; } int validauth(unsigned char *rad, unsigned char *reqauth, unsigned char *sec) { static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; static unsigned char first = 1; static EVP_MD_CTX mdctx; unsigned char hash[EVP_MAX_MD_SIZE]; unsigned int len; int result; pthread_mutex_lock(&lock); if (first) { EVP_MD_CTX_init(&mdctx); first = 0; } len = RADLEN(rad); result = (EVP_DigestInit_ex(&mdctx, EVP_md5(), NULL) && EVP_DigestUpdate(&mdctx, rad, 4) && EVP_DigestUpdate(&mdctx, reqauth, 16) && (len <= 20 || EVP_DigestUpdate(&mdctx, rad + 20, len - 20)) && EVP_DigestUpdate(&mdctx, sec, strlen((char *)sec)) && EVP_DigestFinal_ex(&mdctx, hash, &len) && len == 16 && !memcmp(hash, rad + 4, 16)); pthread_mutex_unlock(&lock); return result; } int checkmessageauth(unsigned char *rad, uint8_t *authattr, char *secret) { static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; static unsigned char first = 1; static HMAC_CTX hmacctx; unsigned int md_len; uint8_t auth[16], hash[EVP_MAX_MD_SIZE]; pthread_mutex_lock(&lock); if (first) { HMAC_CTX_init(&hmacctx); first = 0; } memcpy(auth, authattr, 16); memset(authattr, 0, 16); md_len = 0; HMAC_Init_ex(&hmacctx, secret, strlen(secret), EVP_md5(), NULL); HMAC_Update(&hmacctx, rad, RADLEN(rad)); HMAC_Final(&hmacctx, hash, &md_len); memcpy(authattr, auth, 16); if (md_len != 16) { debug(DBG_WARN, "message auth computation failed"); pthread_mutex_unlock(&lock); return 0; } if (memcmp(auth, hash, 16)) { debug(DBG_WARN, "message authenticator, wrong value"); pthread_mutex_unlock(&lock); return 0; } pthread_mutex_unlock(&lock); return 1; } int createmessageauth(unsigned char *rad, unsigned char *authattrval, char *secret) { static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; static unsigned char first = 1; static HMAC_CTX hmacctx; unsigned int md_len; if (!authattrval) return 1; pthread_mutex_lock(&lock); if (first) { HMAC_CTX_init(&hmacctx); first = 0; } memset(authattrval, 0, 16); md_len = 0; HMAC_Init_ex(&hmacctx, secret, strlen(secret), EVP_md5(), NULL); HMAC_Update(&hmacctx, rad, RADLEN(rad)); HMAC_Final(&hmacctx, authattrval, &md_len); if (md_len != 16) { debug(DBG_WARN, "message auth computation failed"); pthread_mutex_unlock(&lock); return 0; } pthread_mutex_unlock(&lock); return 1; } unsigned char *attrget(unsigned char *attrs, int length, uint8_t type) { while (length > 1) { if (ATTRTYPE(attrs) == type) return attrs; length -= ATTRLEN(attrs); attrs += ATTRLEN(attrs); } return NULL; } void sendrq(struct server *to, struct request *rq) { int i; uint8_t *attr; pthread_mutex_lock(&to->newrq_mutex); /* might simplify if only try nextid, might be ok */ for (i = to->nextid; i < MAX_REQUESTS; i++) if (!to->requests[i].buf) break; if (i == MAX_REQUESTS) { for (i = 0; i < to->nextid; i++) if (!to->requests[i].buf) break; if (i == to->nextid) { debug(DBG_WARN, "No room in queue, dropping request"); free(rq->buf); pthread_mutex_unlock(&to->newrq_mutex); return; } } rq->buf[1] = (char)i; attr = attrget(rq->buf + 20, RADLEN(rq->buf) - 20, RAD_Attr_Message_Authenticator); if (attr && !createmessageauth(rq->buf, ATTRVAL(attr), to->peer.secret)) { free(rq->buf); pthread_mutex_unlock(&to->newrq_mutex); return; } debug(DBG_DBG, "sendrq: inserting packet with id %d in queue for %s", i, to->peer.host); to->requests[i] = *rq; to->nextid = i + 1; if (!to->newrq) { to->newrq = 1; debug(DBG_DBG, "signalling client writer"); pthread_cond_signal(&to->newrq_cond); } pthread_mutex_unlock(&to->newrq_mutex); } void sendreply(struct client *to, unsigned char *buf, struct sockaddr_storage *tosa) { struct replyq *replyq = to->replyq; if (!radsign(buf, (unsigned char *)to->peer.secret)) { free(buf); debug(DBG_WARN, "sendreply: failed to sign message"); return; } pthread_mutex_lock(&replyq->count_mutex); if (replyq->count == replyq->size) { debug(DBG_WARN, "No room in queue, dropping request"); pthread_mutex_unlock(&replyq->count_mutex); free(buf); return; } replyq->replies[replyq->count].buf = buf; if (tosa) replyq->replies[replyq->count].tosa = *tosa; replyq->count++; if (replyq->count == 1) { debug(DBG_DBG, "signalling server writer"); pthread_cond_signal(&replyq->count_cond); } pthread_mutex_unlock(&replyq->count_mutex); } int pwdencrypt(uint8_t *in, uint8_t len, char *shared, uint8_t sharedlen, uint8_t *auth) { static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; static unsigned char first = 1; static EVP_MD_CTX mdctx; unsigned char hash[EVP_MAX_MD_SIZE], *input; unsigned int md_len; uint8_t i, offset = 0, out[128]; pthread_mutex_lock(&lock); if (first) { EVP_MD_CTX_init(&mdctx); first = 0; } input = auth; for (;;) { if (!EVP_DigestInit_ex(&mdctx, EVP_md5(), NULL) || !EVP_DigestUpdate(&mdctx, (uint8_t *)shared, sharedlen) || !EVP_DigestUpdate(&mdctx, input, 16) || !EVP_DigestFinal_ex(&mdctx, hash, &md_len) || md_len != 16) { pthread_mutex_unlock(&lock); return 0; } for (i = 0; i < 16; i++) out[offset + i] = hash[i] ^ in[offset + i]; input = out + offset - 16; offset += 16; if (offset == len) break; } memcpy(in, out, len); pthread_mutex_unlock(&lock); return 1; } int pwddecrypt(uint8_t *in, uint8_t len, char *shared, uint8_t sharedlen, uint8_t *auth) { static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; static unsigned char first = 1; static EVP_MD_CTX mdctx; unsigned char hash[EVP_MAX_MD_SIZE], *input; unsigned int md_len; uint8_t i, offset = 0, out[128]; pthread_mutex_lock(&lock); if (first) { EVP_MD_CTX_init(&mdctx); first = 0; } input = auth; for (;;) { if (!EVP_DigestInit_ex(&mdctx, EVP_md5(), NULL) || !EVP_DigestUpdate(&mdctx, (uint8_t *)shared, sharedlen) || !EVP_DigestUpdate(&mdctx, input, 16) || !EVP_DigestFinal_ex(&mdctx, hash, &md_len) || md_len != 16) { pthread_mutex_unlock(&lock); return 0; } for (i = 0; i < 16; i++) out[offset + i] = hash[i] ^ in[offset + i]; input = in + offset; offset += 16; if (offset == len) break; } memcpy(in, out, len); pthread_mutex_unlock(&lock); return 1; } int msmppencrypt(uint8_t *text, uint8_t len, uint8_t *shared, uint8_t sharedlen, uint8_t *auth, uint8_t *salt) { static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; static unsigned char first = 1; static EVP_MD_CTX mdctx; unsigned char hash[EVP_MAX_MD_SIZE]; unsigned int md_len; uint8_t i, offset; pthread_mutex_lock(&lock); if (first) { EVP_MD_CTX_init(&mdctx); first = 0; } #if 0 printf("msppencrypt auth in: "); for (i = 0; i < 16; i++) printf("%02x ", auth[i]); printf("\n"); printf("msppencrypt salt in: "); for (i = 0; i < 2; i++) printf("%02x ", salt[i]); printf("\n"); printf("msppencrypt in: "); for (i = 0; i < len; i++) printf("%02x ", text[i]); printf("\n"); #endif if (!EVP_DigestInit_ex(&mdctx, EVP_md5(), NULL) || !EVP_DigestUpdate(&mdctx, shared, sharedlen) || !EVP_DigestUpdate(&mdctx, auth, 16) || !EVP_DigestUpdate(&mdctx, salt, 2) || !EVP_DigestFinal_ex(&mdctx, hash, &md_len)) { pthread_mutex_unlock(&lock); return 0; } #if 0 printf("msppencrypt hash: "); for (i = 0; i < 16; i++) printf("%02x ", hash[i]); printf("\n"); #endif for (i = 0; i < 16; i++) text[i] ^= hash[i]; for (offset = 16; offset < len; offset += 16) { #if 0 printf("text + offset - 16 c(%d): ", offset / 16); for (i = 0; i < 16; i++) printf("%02x ", (text + offset - 16)[i]); printf("\n"); #endif if (!EVP_DigestInit_ex(&mdctx, EVP_md5(), NULL) || !EVP_DigestUpdate(&mdctx, shared, sharedlen) || !EVP_DigestUpdate(&mdctx, text + offset - 16, 16) || !EVP_DigestFinal_ex(&mdctx, hash, &md_len) || md_len != 16) { pthread_mutex_unlock(&lock); return 0; } #if 0 printf("msppencrypt hash: "); for (i = 0; i < 16; i++) printf("%02x ", hash[i]); printf("\n"); #endif for (i = 0; i < 16; i++) text[offset + i] ^= hash[i]; } #if 0 printf("msppencrypt out: "); for (i = 0; i < len; i++) printf("%02x ", text[i]); printf("\n"); #endif pthread_mutex_unlock(&lock); return 1; } int msmppdecrypt(uint8_t *text, uint8_t len, uint8_t *shared, uint8_t sharedlen, uint8_t *auth, uint8_t *salt) { static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; static unsigned char first = 1; static EVP_MD_CTX mdctx; unsigned char hash[EVP_MAX_MD_SIZE]; unsigned int md_len; uint8_t i, offset; char plain[255]; pthread_mutex_lock(&lock); if (first) { EVP_MD_CTX_init(&mdctx); first = 0; } #if 0 printf("msppdecrypt auth in: "); for (i = 0; i < 16; i++) printf("%02x ", auth[i]); printf("\n"); printf("msppedecrypt salt in: "); for (i = 0; i < 2; i++) printf("%02x ", salt[i]); printf("\n"); printf("msppedecrypt in: "); for (i = 0; i < len; i++) printf("%02x ", text[i]); printf("\n"); #endif if (!EVP_DigestInit_ex(&mdctx, EVP_md5(), NULL) || !EVP_DigestUpdate(&mdctx, shared, sharedlen) || !EVP_DigestUpdate(&mdctx, auth, 16) || !EVP_DigestUpdate(&mdctx, salt, 2) || !EVP_DigestFinal_ex(&mdctx, hash, &md_len)) { pthread_mutex_unlock(&lock); return 0; } #if 0 printf("msppedecrypt hash: "); for (i = 0; i < 16; i++) printf("%02x ", hash[i]); printf("\n"); #endif for (i = 0; i < 16; i++) plain[i] = text[i] ^ hash[i]; for (offset = 16; offset < len; offset += 16) { #if 0 printf("text + offset - 16 c(%d): ", offset / 16); for (i = 0; i < 16; i++) printf("%02x ", (text + offset - 16)[i]); printf("\n"); #endif if (!EVP_DigestInit_ex(&mdctx, EVP_md5(), NULL) || !EVP_DigestUpdate(&mdctx, shared, sharedlen) || !EVP_DigestUpdate(&mdctx, text + offset - 16, 16) || !EVP_DigestFinal_ex(&mdctx, hash, &md_len) || md_len != 16) { pthread_mutex_unlock(&lock); return 0; } #if 0 printf("msppedecrypt hash: "); for (i = 0; i < 16; i++) printf("%02x ", hash[i]); printf("\n"); #endif for (i = 0; i < 16; i++) plain[offset + i] = text[offset + i] ^ hash[i]; } memcpy(text, plain, len); #if 0 printf("msppedecrypt out: "); for (i = 0; i < len; i++) printf("%02x ", text[i]); printf("\n"); #endif pthread_mutex_unlock(&lock); return 1; } struct realm *id2realm(char *id, uint8_t len) { int i; for (i = 0; i < realm_count; i++) if (!regexec(&realms[i].regex, id, 0, NULL, 0)) { debug(DBG_DBG, "found matching realm: %s", realms[i].name); return realms + i; } return NULL; } int rqinqueue(struct server *to, struct client *from, uint8_t id) { int i; pthread_mutex_lock(&to->newrq_mutex); for (i = 0; i < MAX_REQUESTS; i++) if (to->requests[i].buf && to->requests[i].origid == id && to->requests[i].from == from) break; pthread_mutex_unlock(&to->newrq_mutex); return i < MAX_REQUESTS; } int attrvalidate(unsigned char *attrs, int length) { while (length > 1) { if (ATTRLEN(attrs) < 2) { debug(DBG_WARN, "attrvalidate: invalid attribute length %d", ATTRLEN(attrs)); return 0; } length -= ATTRLEN(attrs); if (length < 0) { debug(DBG_WARN, "attrvalidate: attribute length %d exceeds packet length", ATTRLEN(attrs)); return 0; } attrs += ATTRLEN(attrs); } if (length) debug(DBG_WARN, "attrvalidate: malformed packet? remaining byte after last attribute"); return 1; } int pwdrecrypt(uint8_t *pwd, uint8_t len, char *oldsecret, char *newsecret, uint8_t *oldauth, uint8_t *newauth) { #ifdef DEBUG int i; #endif if (len < 16 || len > 128 || len % 16) { debug(DBG_WARN, "pwdrecrypt: invalid password length"); return 0; } if (!pwddecrypt(pwd, len, oldsecret, strlen(oldsecret), oldauth)) { debug(DBG_WARN, "pwdrecrypt: cannot decrypt password"); return 0; } #ifdef DEBUG printf("pwdrecrypt: password: "); for (i = 0; i < len; i++) printf("%02x ", pwd[i]); printf("\n"); #endif if (!pwdencrypt(pwd, len, newsecret, strlen(newsecret), newauth)) { debug(DBG_WARN, "pwdrecrypt: cannot encrypt password"); return 0; } return 1; } int msmpprecrypt(uint8_t *msmpp, uint8_t len, char *oldsecret, char *newsecret, unsigned char *oldauth, char *newauth) { if (len < 18) return 0; if (!msmppdecrypt(msmpp + 2, len - 2, (unsigned char *)oldsecret, strlen(oldsecret), oldauth, msmpp)) { debug(DBG_WARN, "msmpprecrypt: failed to decrypt msppe key"); return 0; } if (!msmppencrypt(msmpp + 2, len - 2, (unsigned char *)newsecret, strlen(newsecret), (unsigned char *)newauth, msmpp)) { debug(DBG_WARN, "msmpprecrypt: failed to encrypt msppe key"); return 0; } return 1; } int msmppe(unsigned char *attrs, int length, uint8_t type, char *attrtxt, struct request *rq, char *oldsecret, char *newsecret) { unsigned char *attr; for (attr = attrs; (attr = attrget(attr, length - (attr - attrs), type)); attr += ATTRLEN(attr)) { debug(DBG_DBG, "msmppe: Got %s", attrtxt); if (!msmpprecrypt(ATTRVAL(attr), ATTRVALLEN(attr), oldsecret, newsecret, rq->buf + 4, rq->origauth)) return 0; } return 1; } void respondstatusserver(struct request *rq) { unsigned char *resp; resp = malloc(20); if (!resp) { debug(DBG_ERR, "respondstatusserver: malloc failed"); return; } memcpy(resp, rq->buf, 20); resp[0] = RAD_Access_Accept; resp[2] = 0; resp[3] = 20; debug(DBG_DBG, "respondstatusserver: responding to %s", rq->from->peer.host); sendreply(rq->from, resp, rq->from->peer.type == 'U' ? &rq->fromsa : NULL); } void respondreject(struct request *rq, char *message) { unsigned char *resp; int len = 20; if (message) len += 2 + strlen(message); resp = malloc(len); if (!resp) { debug(DBG_ERR, "respondreject: malloc failed"); return; } memcpy(resp, rq->buf, 20); resp[0] = RAD_Access_Reject; *(uint16_t *)(resp + 2) = htons(len); if (message) { resp[20] = RAD_Attr_Reply_Message; resp[21] = len - 20; memcpy(resp + 22, message, len - 22); } sendreply(rq->from, resp, rq->from->peer.type == 'U' ? &rq->fromsa : NULL); } void radsrv(struct request *rq) { uint8_t code, id, *auth, *attrs, *attr; uint16_t len; struct server *to = NULL; char username[256]; unsigned char *buf, newauth[16]; struct realm *realm = NULL; buf = rq->buf; code = *(uint8_t *)buf; id = *(uint8_t *)(buf + 1); len = RADLEN(buf); auth = (uint8_t *)(buf + 4); debug(DBG_DBG, "radsrv: code %d, id %d, length %d", code, id, len); if (code != RAD_Access_Request && code != RAD_Status_Server) { debug(DBG_INFO, "radsrv: server currently accepts only access-requests and status-server, ignoring"); free(buf); return; } len -= 20; attrs = buf + 20; if (!attrvalidate(attrs, len)) { debug(DBG_WARN, "radsrv: attribute validation failed, ignoring packet"); free(buf); return; } if (code == RAD_Access_Request) { attr = attrget(attrs, len, RAD_Attr_User_Name); if (!attr) { debug(DBG_WARN, "radsrv: ignoring request, no username attribute"); free(buf); return; } memcpy(username, ATTRVAL(attr), ATTRVALLEN(attr)); username[ATTRVALLEN(attr)] = '\0'; debug(DBG_DBG, "Access Request with username: %s", username); realm = id2realm(username, strlen(username)); if (!realm) { debug(DBG_INFO, "radsrv: ignoring request, don't know where to send it"); free(buf); return; } to = realm->server; if (to && rqinqueue(to, rq->from, id)) { debug(DBG_INFO, "radsrv: already got request from host %s with id %d, ignoring", rq->from->peer.host, id); free(buf); return; } } attr = attrget(attrs, len, RAD_Attr_Message_Authenticator); if (attr && (ATTRVALLEN(attr) != 16 || !checkmessageauth(buf, ATTRVAL(attr), rq->from->peer.secret))) { debug(DBG_WARN, "radsrv: message authentication failed"); free(buf); return; } if (code == RAD_Status_Server) { respondstatusserver(rq); return; } if (!to) { debug(DBG_INFO, "radsrv: sending reject to %s for %s", rq->from->peer.host, username); respondreject(rq, realm->message); return; } if (!RAND_bytes(newauth, 16)) { debug(DBG_WARN, "radsrv: failed to generate random auth"); free(buf); return; } #ifdef DEBUG printauth("auth", auth); #endif attr = attrget(attrs, len, RAD_Attr_User_Password); if (attr) { debug(DBG_DBG, "radsrv: found userpwdattr with value length %d", ATTRVALLEN(attr)); if (!pwdrecrypt(ATTRVAL(attr), ATTRVALLEN(attr), rq->from->peer.secret, to->peer.secret, auth, newauth)) { free(buf); return; } } attr = attrget(attrs, len, RAD_Attr_Tunnel_Password); if (attr) { debug(DBG_DBG, "radsrv: found tunnelpwdattr with value length %d", ATTRVALLEN(attr)); if (!pwdrecrypt(ATTRVAL(attr), ATTRVALLEN(attr), rq->from->peer.secret, to->peer.secret, auth, newauth)) { free(buf); return; } } rq->origid = id; memcpy(rq->origauth, auth, 16); memcpy(auth, newauth, 16); sendrq(to, rq); } void *clientrd(void *arg) { struct server *server = (struct server *)arg; struct client *from; int i, len, sublen; unsigned char *buf, *messageauth, *subattrs, *attrs, *attr; struct sockaddr_storage fromsa; struct timeval lastconnecttry; char tmp[256]; for (;;) { lastconnecttry = server->lastconnecttry; buf = (server->peer.type == 'U' ? radudpget(server->sock, NULL, &server, NULL) : radtlsget(server->peer.ssl)); if (!buf && server->peer.type == 'T') { tlsconnect(server, &lastconnecttry, "clientrd"); continue; } server->connectionok = 1; i = buf[1]; /* i is the id */ switch (*buf) { case RAD_Access_Accept: debug(DBG_DBG, "got Access Accept with id %d", i); break; case RAD_Access_Reject: debug(DBG_DBG, "got Access Reject with id %d", i); break; case RAD_Access_Challenge: debug(DBG_DBG, "got Access Challenge with id %d", i); break; default: free(buf); debug(DBG_INFO, "clientrd: discarding, only accept access accept, access reject and access challenge messages"); continue; } pthread_mutex_lock(&server->newrq_mutex); if (!server->requests[i].buf || !server->requests[i].tries) { pthread_mutex_unlock(&server->newrq_mutex); free(buf); debug(DBG_INFO, "clientrd: no matching request sent with this id, ignoring"); continue; } if (server->requests[i].received) { pthread_mutex_unlock(&server->newrq_mutex); free(buf); debug(DBG_INFO, "clientrd: already received, ignoring"); continue; } if (!validauth(buf, server->requests[i].buf + 4, (unsigned char *)server->peer.secret)) { pthread_mutex_unlock(&server->newrq_mutex); free(buf); debug(DBG_WARN, "clientrd: invalid auth, ignoring"); continue; } from = server->requests[i].from; len = RADLEN(buf) - 20; attrs = buf + 20; if (!attrvalidate(attrs, len)) { pthread_mutex_unlock(&server->newrq_mutex); free(buf); debug(DBG_WARN, "clientrd: attribute validation failed, ignoring packet"); continue; } /* Message Authenticator */ messageauth = attrget(attrs, len, RAD_Attr_Message_Authenticator); if (messageauth) { if (ATTRVALLEN(messageauth) != 16) { pthread_mutex_unlock(&server->newrq_mutex); free(buf); debug(DBG_WARN, "clientrd: illegal message auth attribute length, ignoring packet"); continue; } memcpy(tmp, buf + 4, 16); memcpy(buf + 4, server->requests[i].buf + 4, 16); if (!checkmessageauth(buf, ATTRVAL(messageauth), server->peer.secret)) { pthread_mutex_unlock(&server->newrq_mutex); free(buf); debug(DBG_WARN, "clientrd: message authentication failed"); continue; } memcpy(buf + 4, tmp, 16); debug(DBG_DBG, "clientrd: message auth ok"); } if (*server->requests[i].buf == RAD_Status_Server) { server->requests[i].received = 1; pthread_mutex_unlock(&server->newrq_mutex); free(buf); debug(DBG_INFO, "clientrd: got status server response from %s", server->peer.host); continue; } /* MS MPPE */ for (attr = attrs; (attr = attrget(attr, len - (attr - attrs), RAD_Attr_Vendor_Specific)); attr += ATTRLEN(attr)) { if (ATTRVALLEN(attr) <= 4) break; if (((uint16_t *)attr)[1] != 0 || ntohs(((uint16_t *)attr)[2]) != 311) /* 311 == MS */ continue; sublen = ATTRVALLEN(attr) - 4; subattrs = ATTRVAL(attr) + 4; if (!attrvalidate(subattrs, sublen) || !msmppe(subattrs, sublen, RAD_VS_ATTR_MS_MPPE_Send_Key, "MS MPPE Send Key", server->requests + i, server->peer.secret, from->peer.secret) || !msmppe(subattrs, sublen, RAD_VS_ATTR_MS_MPPE_Recv_Key, "MS MPPE Recv Key", server->requests + i, server->peer.secret, from->peer.secret)) break; } if (attr) { pthread_mutex_unlock(&server->newrq_mutex); free(buf); debug(DBG_WARN, "clientrd: MS attribute handling failed, ignoring packet"); continue; } if (*buf == RAD_Access_Accept || *buf == RAD_Access_Reject) { attr = attrget(server->requests[i].buf + 20, RADLEN(server->requests[i].buf) - 20, RAD_Attr_User_Name); /* we know the attribute exists */ memcpy(tmp, ATTRVAL(attr), ATTRVALLEN(attr)); tmp[ATTRVALLEN(attr)] = '\0'; switch (*buf) { case RAD_Access_Accept: debug(DBG_INFO, "Access Accept for %s from %s", tmp, server->peer.host); break; case RAD_Access_Reject: debug(DBG_INFO, "Access Reject for %s from %s", tmp, server->peer.host); break; } } /* once we set received = 1, requests[i] may be reused */ buf[1] = (char)server->requests[i].origid; memcpy(buf + 4, server->requests[i].origauth, 16); #ifdef DEBUG printauth("origauth/buf+4", buf + 4); #endif if (messageauth) { if (!createmessageauth(buf, ATTRVAL(messageauth), from->peer.secret)) { pthread_mutex_unlock(&server->newrq_mutex); free(buf); continue; } debug(DBG_DBG, "clientrd: computed messageauthattr"); } if (from->peer.type == 'U') fromsa = server->requests[i].fromsa; server->requests[i].received = 1; pthread_mutex_unlock(&server->newrq_mutex); debug(DBG_DBG, "clientrd: giving packet back to where it came from"); sendreply(from, buf, from->peer.type == 'U' ? &fromsa : NULL); } } void *clientwr(void *arg) { struct server *server = (struct server *)arg; struct request *rq; pthread_t clientrdth; int i; uint8_t rnd; struct timeval now, lastsend; struct timespec timeout; struct request statsrvrq; unsigned char statsrvbuf[38]; memset(&timeout, 0, sizeof(struct timespec)); if (server->statusserver) { memset(&statsrvrq, 0, sizeof(struct request)); memset(statsrvbuf, 0, sizeof(statsrvbuf)); statsrvbuf[0] = RAD_Status_Server; statsrvbuf[3] = 38; statsrvbuf[20] = RAD_Attr_Message_Authenticator; statsrvbuf[21] = 18; gettimeofday(&lastsend, NULL); } if (server->peer.type == 'U') { if ((server->sock = connecttoserver(server->peer.addrinfo)) < 0) debugx(1, DBG_ERR, "clientwr: connecttoserver failed"); } else tlsconnect(server, NULL, "new client"); if (pthread_create(&clientrdth, NULL, clientrd, (void *)server)) debugx(1, DBG_ERR, "clientwr: pthread_create failed"); for (;;) { pthread_mutex_lock(&server->newrq_mutex); if (!server->newrq) { gettimeofday(&now, NULL); if (server->statusserver) { /* random 0-7 seconds */ RAND_bytes(&rnd, 1); rnd /= 32; if (!timeout.tv_sec || timeout.tv_sec - now.tv_sec > lastsend.tv_sec + STATUS_SERVER_PERIOD + rnd) timeout.tv_sec = lastsend.tv_sec + STATUS_SERVER_PERIOD + rnd; } if (timeout.tv_sec) { debug(DBG_DBG, "clientwr: waiting up to %ld secs for new request", timeout.tv_sec - now.tv_sec); pthread_cond_timedwait(&server->newrq_cond, &server->newrq_mutex, &timeout); timeout.tv_sec = 0; } else { debug(DBG_DBG, "clientwr: waiting for new request"); pthread_cond_wait(&server->newrq_cond, &server->newrq_mutex); } } if (server->newrq) { debug(DBG_DBG, "clientwr: got new request"); server->newrq = 0; } else debug(DBG_DBG, "clientwr: request timer expired, processing request queue"); pthread_mutex_unlock(&server->newrq_mutex); for (i = 0; i < MAX_REQUESTS; i++) { pthread_mutex_lock(&server->newrq_mutex); while (!server->requests[i].buf && i < MAX_REQUESTS) i++; if (i == MAX_REQUESTS) { pthread_mutex_unlock(&server->newrq_mutex); break; } rq = server->requests + i; if (rq->received) { debug(DBG_DBG, "clientwr: packet %d in queue is marked as received", i); if (rq->buf) { debug(DBG_DBG, "clientwr: freeing received packet %d from queue", i); free(rq->buf); /* setting this to NULL means that it can be reused */ rq->buf = NULL; } pthread_mutex_unlock(&server->newrq_mutex); continue; } gettimeofday(&now, NULL); if (now.tv_sec < rq->expiry.tv_sec) { if (!timeout.tv_sec || rq->expiry.tv_sec < timeout.tv_sec) timeout.tv_sec = rq->expiry.tv_sec; pthread_mutex_unlock(&server->newrq_mutex); continue; } if (rq->tries == (*rq->buf == RAD_Status_Server || server->peer.type == 'T' ? 1 : REQUEST_RETRIES)) { debug(DBG_DBG, "clientwr: removing expired packet from queue"); if (*rq->buf == RAD_Status_Server) debug(DBG_WARN, "clientwr: no status server response, %s dead?", server->peer.host); free(rq->buf); /* setting this to NULL means that it can be reused */ rq->buf = NULL; pthread_mutex_unlock(&server->newrq_mutex); continue; } pthread_mutex_unlock(&server->newrq_mutex); rq->expiry.tv_sec = now.tv_sec + (*rq->buf == RAD_Status_Server || server->peer.type == 'T' ? REQUEST_EXPIRY : REQUEST_EXPIRY / REQUEST_RETRIES); if (!timeout.tv_sec || rq->expiry.tv_sec < timeout.tv_sec) timeout.tv_sec = rq->expiry.tv_sec; rq->tries++; clientradput(server, server->requests[i].buf); gettimeofday(&lastsend, NULL); } if (server->statusserver) { gettimeofday(&now, NULL); if (now.tv_sec - lastsend.tv_sec >= STATUS_SERVER_PERIOD) { if (!RAND_bytes(statsrvbuf + 4, 16)) { debug(DBG_WARN, "clientwr: failed to generate random auth"); continue; } statsrvrq.buf = malloc(sizeof(statsrvbuf)); if (!statsrvrq.buf) { debug(DBG_ERR, "clientwr: malloc failed"); continue; } memcpy(statsrvrq.buf, statsrvbuf, sizeof(statsrvbuf)); debug(DBG_DBG, "clientwr: sending status server to %s", server->peer.host); lastsend.tv_sec = now.tv_sec; sendrq(server, &statsrvrq); } } } } void *udpserverwr(void *arg) { struct replyq *replyq = &udp_server_replyq; struct reply *reply = replyq->replies; pthread_mutex_lock(&replyq->count_mutex); for (;;) { while (!replyq->count) { debug(DBG_DBG, "udp server writer, waiting for signal"); pthread_cond_wait(&replyq->count_cond, &replyq->count_mutex); debug(DBG_DBG, "udp server writer, got signal"); } pthread_mutex_unlock(&replyq->count_mutex); if (sendto(udp_server_sock, reply->buf, RADLEN(reply->buf), 0, (struct sockaddr *)&reply->tosa, SOCKADDR_SIZE(reply->tosa)) < 0) debug(DBG_WARN, "sendudp: send failed"); free(reply->buf); pthread_mutex_lock(&replyq->count_mutex); replyq->count--; memmove(replyq->replies, replyq->replies + 1, replyq->count * sizeof(struct reply)); } } void *udpserverrd(void *arg) { struct request rq; pthread_t udpserverwrth; if ((udp_server_sock = bindtoaddr(udp_server_listen->addrinfo)) < 0) debugx(1, DBG_ERR, "udpserverrd: socket/bind failed"); debug(DBG_WARN, "udpserverrd: listening for UDP on %s:%s", udp_server_listen->host ? udp_server_listen->host : "*", udp_server_listen->port); if (pthread_create(&udpserverwrth, NULL, udpserverwr, NULL)) debugx(1, DBG_ERR, "pthread_create failed"); for (;;) { memset(&rq, 0, sizeof(struct request)); rq.buf = radudpget(udp_server_sock, &rq.from, NULL, &rq.fromsa); radsrv(&rq); } } void *tlsserverwr(void *arg) { int cnt; unsigned long error; struct client *client = (struct client *)arg; struct replyq *replyq; debug(DBG_DBG, "tlsserverwr starting for %s", client->peer.host); replyq = client->replyq; pthread_mutex_lock(&replyq->count_mutex); for (;;) { while (!replyq->count) { if (client->peer.ssl) { debug(DBG_DBG, "tls server writer, waiting for signal"); pthread_cond_wait(&replyq->count_cond, &replyq->count_mutex); debug(DBG_DBG, "tls server writer, got signal"); } if (!client->peer.ssl) { /* ssl might have changed while waiting */ pthread_mutex_unlock(&replyq->count_mutex); debug(DBG_DBG, "tlsserverwr: exiting as requested"); pthread_exit(NULL); } } pthread_mutex_unlock(&replyq->count_mutex); cnt = SSL_write(client->peer.ssl, replyq->replies->buf, RADLEN(replyq->replies->buf)); if (cnt > 0) debug(DBG_DBG, "tlsserverwr: Sent %d bytes, Radius packet of length %d", cnt, RADLEN(replyq->replies->buf)); else while ((error = ERR_get_error())) debug(DBG_ERR, "tlsserverwr: SSL: %s", ERR_error_string(error, NULL)); free(replyq->replies->buf); pthread_mutex_lock(&replyq->count_mutex); replyq->count--; memmove(replyq->replies, replyq->replies + 1, replyq->count * sizeof(struct reply)); } } void *tlsserverrd(void *arg) { struct request rq; unsigned long error; int s; struct client *client = (struct client *)arg; pthread_t tlsserverwrth; SSL *ssl; debug(DBG_DBG, "tlsserverrd starting for %s", client->peer.host); ssl = client->peer.ssl; if (SSL_accept(ssl) <= 0) { while ((error = ERR_get_error())) debug(DBG_ERR, "tlsserverrd: SSL: %s", ERR_error_string(error, NULL)); debug(DBG_ERR, "SSL_accept failed"); goto errexit; } if (tlsverifycert(&client->peer)) { if (pthread_create(&tlsserverwrth, NULL, tlsserverwr, (void *)client)) { debug(DBG_ERR, "tlsserverrd: pthread_create failed"); goto errexit; } for (;;) { memset(&rq, 0, sizeof(struct request)); rq.buf = radtlsget(client->peer.ssl); if (!rq.buf) break; debug(DBG_DBG, "tlsserverrd: got Radius message from %s", client->peer.host); rq.from = client; radsrv(&rq); } debug(DBG_ERR, "tlsserverrd: connection lost"); /* stop writer by setting peer.ssl to NULL and give signal in case waiting for data */ client->peer.ssl = NULL; pthread_mutex_lock(&client->replyq->count_mutex); pthread_cond_signal(&client->replyq->count_cond); pthread_mutex_unlock(&client->replyq->count_mutex); debug(DBG_DBG, "tlsserverrd: waiting for writer to end"); pthread_join(tlsserverwrth, NULL); } errexit: s = SSL_get_fd(ssl); SSL_free(ssl); shutdown(s, SHUT_RDWR); close(s); debug(DBG_DBG, "tlsserverrd thread for %s exiting", client->peer.host); client->peer.ssl = NULL; pthread_exit(NULL); } int tlslistener() { pthread_t tlsserverth; int s, snew; struct sockaddr_storage from; size_t fromlen = sizeof(from); struct client *client; if ((s = bindtoaddr(tcp_server_listen->addrinfo)) < 0) debugx(1, DBG_ERR, "tlslistener: socket/bind failed"); listen(s, 0); debug(DBG_WARN, "listening for incoming TCP on %s:%s", tcp_server_listen->host ? tcp_server_listen->host : "*", tcp_server_listen->port); for (;;) { snew = accept(s, (struct sockaddr *)&from, &fromlen); if (snew < 0) { debug(DBG_WARN, "accept failed"); continue; } debug(DBG_WARN, "incoming TLS connection from %s", addr2string((struct sockaddr *)&from, fromlen)); client = find_client('T', (struct sockaddr *)&from, NULL); if (!client) { debug(DBG_WARN, "ignoring request, not a known TLS client"); shutdown(snew, SHUT_RDWR); close(snew); continue; } if (client->peer.ssl) { debug(DBG_WARN, "Ignoring incoming TLS connection, already have one from this client"); shutdown(snew, SHUT_RDWR); close(snew); continue; } client->peer.ssl = SSL_new(client->peer.ssl_ctx); SSL_set_fd(client->peer.ssl, snew); if (pthread_create(&tlsserverth, NULL, tlsserverrd, (void *)client)) { debug(DBG_ERR, "tlslistener: pthread_create failed"); SSL_free(client->peer.ssl); shutdown(snew, SHUT_RDWR); close(snew); client->peer.ssl = NULL; continue; } pthread_detach(tlsserverth); } return 0; } void tlsadd(char *value, char *cacertfile, char *cacertpath, char *certfile, char *certkeyfile, char *certkeypwd) { struct tls *new; SSL_CTX *ctx; int i; unsigned long error; if (!certfile || !certkeyfile) debugx(1, DBG_ERR, "TLSCertificateFile and TLSCertificateKeyFile must be specified in TLS context %s", value); if (!cacertfile && !cacertpath) debugx(1, DBG_ERR, "CA Certificate file or path need to be specified in TLS context %s", value); if (!ssl_locks) { ssl_locks = malloc(CRYPTO_num_locks() * sizeof(pthread_mutex_t)); ssl_lock_count = OPENSSL_malloc(CRYPTO_num_locks() * sizeof(long)); for (i = 0; i < CRYPTO_num_locks(); i++) { ssl_lock_count[i] = 0; pthread_mutex_init(&ssl_locks[i], NULL); } CRYPTO_set_id_callback(ssl_thread_id); CRYPTO_set_locking_callback(ssl_locking_callback); SSL_load_error_strings(); SSL_library_init(); while (!RAND_status()) { time_t t = time(NULL); pid_t pid = getpid(); RAND_seed((unsigned char *)&t, sizeof(time_t)); RAND_seed((unsigned char *)&pid, sizeof(pid)); } } ctx = SSL_CTX_new(TLSv1_method()); if (certkeypwd) { SSL_CTX_set_default_passwd_cb_userdata(ctx, certkeypwd); SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_cb); } if (!SSL_CTX_use_certificate_chain_file(ctx, certfile) || !SSL_CTX_use_PrivateKey_file(ctx, certkeyfile, SSL_FILETYPE_PEM) || !SSL_CTX_check_private_key(ctx) || !SSL_CTX_load_verify_locations(ctx, cacertfile, cacertpath)) { while ((error = ERR_get_error())) debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL)); debugx(1, DBG_ERR, "Error initialising SSL/TLS in TLS context %s", value); } SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, verify_cb); SSL_CTX_set_verify_depth(ctx, MAX_CERT_DEPTH + 1); tls_count++; tls = realloc(tls, tls_count * sizeof(struct tls)); if (!tls) debugx(1, DBG_ERR, "malloc failed"); new = tls + tls_count - 1; memset(new, 0, sizeof(struct tls)); new->name = stringcopy(value, 0); if (!new->name) debugx(1, DBG_ERR, "malloc failed"); new->ctx = ctx; new->count = 0; debug(DBG_DBG, "tlsadd: added TLS context %s", value); } void tlsfree() { int i; for (i = 0; i < tls_count; i++) if (!tls[i].count) SSL_CTX_free(tls[i].ctx); tls_count = 0; free(tls); tls = NULL; } SSL_CTX *tlsgetctx(char *alt1, char *alt2) { int i, c1 = -1, c2 = -1; for (i = 0; i < tls_count; i++) { if (!strcasecmp(tls[i].name, alt1)) { c1 = i; break; } if (c2 == -1 && alt2 && !strcasecmp(tls[i].name, alt2)) c2 = i; } i = (c1 == -1 ? c2 : c1); if (i == -1) return NULL; tls[i].count++; return tls[i].ctx; } void addrealm(char *value, char *server, char *message) { int i, n; struct realm *realm; char *s, *regex = NULL; if (server) { for (i = 0; i < server_count; i++) if (!strcasecmp(server, servers[i].peer.host)) break; if (i == server_count) debugx(1, DBG_ERR, "addrealm failed, no server %s", server); } if (*value == '/') { /* regexp, remove optional trailing / if present */ if (value[strlen(value) - 1] == '/') value[strlen(value) - 1] = '\0'; } else { /* not a regexp, let us make it one */ if (*value == '*' && !value[1]) regex = stringcopy(".*", 0); else { for (n = 0, s = value; *s;) if (*s++ == '.') n++; regex = malloc(strlen(value) + n + 3); if (regex) { regex[0] = '@'; for (n = 1, s = value; *s; s++) { if (*s == '.') regex[n++] = '\\'; regex[n++] = *s; } regex[n++] = '$'; regex[n] = '\0'; } } if (!regex) debugx(1, DBG_ERR, "malloc failed"); debug(DBG_DBG, "addrealm: constructed regexp %s from %s", regex, value); } realm_count++; realms = realloc(realms, realm_count * sizeof(struct realm)); if (!realms) debugx(1, DBG_ERR, "malloc failed"); realm = realms + realm_count - 1; memset(realm, 0, sizeof(struct realm)); realm->name = stringcopy(value, 0); if (!realm->name) debugx(1, DBG_ERR, "malloc failed"); if (message && strlen(message) > 253) debugx(1, DBG_ERR, "ReplyMessage can be at most 253 bytes"); realm->message = message; if (server) realm->server = servers + i; if (regcomp(&realm->regex, regex ? regex : value + 1, REG_ICASE | REG_NOSUB)) debugx(1, DBG_ERR, "addrealm: failed to compile regular expression %s", regex ? regex : value + 1); if (regex) free(regex); debug(DBG_DBG, "addrealm: added realm %s for server %s", value, server); } char *parsehostport(char *s, struct peer *peer) { char *p, *field; int ipv6 = 0; p = s; /* allow literal addresses and port, e.g. [2001:db8::1]:1812 */ if (*p == '[') { p++; field = p; for (; *p && *p != ']' && *p != ' ' && *p != '\t' && *p != '\n'; p++); if (*p != ']') debugx(1, DBG_ERR, "no ] matching initial ["); ipv6 = 1; } else { field = p; for (; *p && *p != ':' && *p != ' ' && *p != '\t' && *p != '\n'; p++); } if (field == p) debugx(1, DBG_ERR, "missing host/address"); peer->host = stringcopy(field, p - field); if (ipv6) { p++; if (*p && *p != ':' && *p != ' ' && *p != '\t' && *p != '\n') debugx(1, DBG_ERR, "unexpected character after ]"); } if (*p == ':') { /* port number or service name is specified */; field = ++p; for (; *p && *p != ' ' && *p != '\t' && *p != '\n'; p++); if (field == p) debugx(1, DBG_ERR, "syntax error, : but no following port"); peer->port = stringcopy(field, p - field); } else peer->port = stringcopy(peer->type == 'U' ? DEFAULT_UDP_PORT : DEFAULT_TLS_PORT, 0); return p; } FILE *openconfigfile(const char *filename) { FILE *f; char pathname[100], *base = NULL; f = fopen(filename, "r"); if (f) { debug(DBG_DBG, "reading config file %s", filename); return f; } if (strlen(filename) + 1 <= sizeof(pathname)) { /* basename() might modify the string */ strcpy(pathname, filename); base = basename(pathname); f = fopen(base, "r"); } if (!f) debugx(1, DBG_ERR, "could not read config file %s nor %s\n%s", filename, base, strerror(errno)); debug(DBG_DBG, "reading config file %s", base); return f; } struct peer *server_create(char type) { struct peer *server; char *conf; server = malloc(sizeof(struct peer)); if (!server) debugx(1, DBG_ERR, "malloc failed"); memset(server, 0, sizeof(struct peer)); server->type = type; conf = (type == 'T' ? options.listentcp : options.listenudp); if (conf) { parsehostport(conf, server); if (!strcmp(server->host, "*")) { free(server->host); server->host = NULL; } } else server->port = stringcopy(type == 'T' ? DEFAULT_TLS_PORT : DEFAULT_UDP_PORT, 0); if (!resolvepeer(server, AI_PASSIVE)) debugx(1, DBG_ERR, "failed to resolve host %s port %s, exiting", server->host, server->port); return server; } /* returns NULL on error, where to continue parsing if token and ok. E.g. "" will return token with empty string */ char *strtokenquote(char *s, char **token, char *del, char *quote, char *comment) { char *t = s, *q, *r; if (!t || !token || !del) return NULL; while (*t && strchr(del, *t)) t++; if (!*t || (comment && strchr(comment, *t))) { *token = NULL; return t + 1; /* needs to be non-NULL, but value doesn't matter */ } if (quote && (q = strchr(quote, *t))) { t++; r = t; while (*t && *t != *q) t++; if (!*t || (t[1] && !strchr(del, t[1]))) return NULL; *t = '\0'; *token = r; return t + 1; } *token = t; t++; while (*t && !strchr(del, *t)) t++; *t = '\0'; return t + 1; } /* Parses config with following syntax: * One of these: * option-name value * option-name = value * Or: * option-name value { * option-name [=] value * ... * } */ void getgeneralconfig(FILE *f, char *block, ...) { va_list ap; char line[1024]; /* initialise lots of stuff to avoid stupid compiler warnings */ char *tokens[3], *s, *opt = NULL, *val = NULL, *word, *optval, **str = NULL; int type = 0, tcount, conftype = 0; void (*cbk)(FILE *, char *, char *, char *) = NULL; while (fgets(line, 1024, f)) { s = line; for (tcount = 0; tcount < 3; tcount++) { s = strtokenquote(s, &tokens[tcount], " \t\n", "\"'", tcount ? NULL : "#"); if (!s) debugx(1, DBG_ERR, "Syntax error in line starting with: %s", line); if (!tokens[tcount]) break; } if (!tcount || **tokens == '#') continue; if (**tokens == '}') { if (block) return; debugx(1, DBG_ERR, "configuration error, found } with no matching {"); } switch (tcount) { case 2: opt = tokens[0]; val = tokens[1]; conftype = CONF_STR; break; case 3: if (tokens[1][0] == '=' && tokens[1][1] == '\0') { opt = tokens[0]; val = tokens[2]; conftype = CONF_STR; break; } if (tokens[2][0] == '{' && tokens[2][1] == '\0') { opt = tokens[0]; val = tokens[1]; conftype = CONF_CBK; break; } /* fall through */ default: if (block) debugx(1, DBG_ERR, "configuration error in block %s, line starting with %s", block, tokens[0]); debugx(1, DBG_ERR, "configuration error, syntax error in line starting with %s", tokens[0]); } if (!*val) debugx(1, DBG_ERR, "configuration error, option %s needs a non-empty value", opt); va_start(ap, block); while ((word = va_arg(ap, char *))) { type = va_arg(ap, int); switch (type) { case CONF_STR: str = va_arg(ap, char **); if (!str) debugx(1, DBG_ERR, "getgeneralconfig: internal parameter error"); break; case CONF_CBK: cbk = va_arg(ap, void (*)(FILE *, char *, char *, char *)); break; default: debugx(1, DBG_ERR, "getgeneralconfig: internal parameter error"); } if (!strcasecmp(opt, word)) break; } va_end(ap); if (!word) { if (block) debugx(1, DBG_ERR, "configuration error in block %s, unknown option %s", block, opt); debugx(1, DBG_ERR, "configuration error, unknown option %s", opt); } if (type != conftype) { if (block) debugx(1, DBG_ERR, "configuration error in block %s, wrong syntax for option %s", block, opt); debugx(1, DBG_ERR, "configuration error, wrong syntax for option %s", opt); } switch (type) { case CONF_STR: if (block) debug(DBG_DBG, "getgeneralconfig: block %s: %s = %s", block, opt, val); else debug(DBG_DBG, "getgeneralconfig: %s = %s", opt, val); *str = stringcopy(val, 0); break; case CONF_CBK: optval = malloc(strlen(opt) + strlen(val) + 2); if (!optval) debugx(1, DBG_ERR, "malloc failed"); sprintf(optval, "%s %s", opt, val); cbk(f, optval, opt, val); free(optval); break; default: debugx(1, DBG_ERR, "getgeneralconfig: internal parameter error"); } } } void confclsrv_cb(FILE *f, char *block, char *opt, char *val) { char *type = NULL, *secret = NULL, *port = NULL, *tls = NULL, *statusserver = NULL; struct client *client = NULL; struct server *server = NULL; struct peer *peer; debug(DBG_DBG, "confclsrv_cb called for %s", block); if (!strcasecmp(opt, "client")) { getgeneralconfig(f, block, "type", CONF_STR, &type, "secret", CONF_STR, &secret, "tls", CONF_STR, &tls, NULL ); client_count++; clients = realloc(clients, client_count * sizeof(struct client)); if (!clients) debugx(1, DBG_ERR, "malloc failed"); client = clients + client_count - 1; memset(client, 0, sizeof(struct client)); peer = &client->peer; } else { getgeneralconfig(f, block, "type", CONF_STR, &type, "secret", CONF_STR, &secret, "port", CONF_STR, &port, "tls", CONF_STR, &tls, "StatusServer", CONF_STR, &statusserver, NULL ); server_count++; servers = realloc(servers, server_count * sizeof(struct server)); if (!servers) debugx(1, DBG_ERR, "malloc failed"); server = servers + server_count - 1; memset(server, 0, sizeof(struct server)); peer = &server->peer; peer->port = port; if (statusserver) { if (!strcasecmp(statusserver, "on")) server->statusserver = 1; else if (strcasecmp(statusserver, "off")) debugx(1, DBG_ERR, "error in block %s, StatusServer is %s, must be on or off", block, statusserver); free(statusserver); } } peer->host = stringcopy(val, 0); if (type && !strcasecmp(type, "udp")) { peer->type = 'U'; if (client) client_udp_count++; else { server_udp_count++; if (!port) peer->port = stringcopy(DEFAULT_UDP_PORT, 0); } } else if (type && !strcasecmp(type, "tls")) { if (client) { peer->ssl_ctx = tls ? tlsgetctx(tls, NULL) : tlsgetctx("defaultclient", "default"); client_tls_count++; } else { peer->ssl_ctx = tls ? tlsgetctx(tls, NULL) : tlsgetctx("defaultserver", "default"); server_tls_count++; if (!port) peer->port = stringcopy(DEFAULT_TLS_PORT, 0); } if (!peer->ssl_ctx) debugx(1, DBG_ERR, "error in block %s, no tls context defined", block); peer->type = 'T'; } else debugx(1, DBG_ERR, "error in block %s, type must be set to UDP or TLS", block); free(type); if (!resolvepeer(peer, 0)) debugx(1, DBG_ERR, "failed to resolve host %s port %s, exiting", peer->host, peer->port); if (!secret) { if (peer->type == 'U') debugx(1, DBG_ERR, "error in block %s, secret must be specified for UDP", block); peer->secret = stringcopy(DEFAULT_TLS_SECRET, 0); } else { peer->secret = secret; } if (client) { if (peer->type == 'U') client->replyq = &udp_server_replyq; else { client->replyq = malloc(sizeof(struct replyq)); if (!client->replyq) debugx(1, DBG_ERR, "malloc failed"); client->replyq->replies = calloc(MAX_REQUESTS, sizeof(struct reply)); if (!client->replyq->replies) debugx(1, DBG_ERR, "malloc failed"); client->replyq->size = MAX_REQUESTS; client->replyq->count = 0; pthread_mutex_init(&client->replyq->count_mutex, NULL); pthread_cond_init(&client->replyq->count_cond, NULL); } } else { pthread_mutex_init(&server->lock, NULL); server->sock = -1; server->requests = calloc(MAX_REQUESTS, sizeof(struct request)); if (!server->requests) debugx(1, DBG_ERR, "malloc failed"); server->newrq = 0; pthread_mutex_init(&server->newrq_mutex, NULL); pthread_cond_init(&server->newrq_cond, NULL); } } void confrealm_cb(FILE *f, char *block, char *opt, char *val) { char *server = NULL, *msg = NULL; debug(DBG_DBG, "confrealm_cb called for %s", block); getgeneralconfig(f, block, "server", CONF_STR, &server, "ReplyMessage", CONF_STR, &msg, NULL ); addrealm(val, server, msg); free(server); } void conftls_cb(FILE *f, char *block, char *opt, char *val) { char *cacertfile = NULL, *cacertpath = NULL, *certfile = NULL, *certkeyfile = NULL, *certkeypwd = NULL; debug(DBG_DBG, "conftls_cb called for %s", block); getgeneralconfig(f, block, "CACertificateFile", CONF_STR, &cacertfile, "CACertificatePath", CONF_STR, &cacertpath, "CertificateFile", CONF_STR, &certfile, "CertificateKeyFile", CONF_STR, &certkeyfile, "CertificateKeyPassword", CONF_STR, &certkeypwd, NULL ); tlsadd(val, cacertfile, cacertpath, certfile, certkeyfile, certkeypwd); free(cacertfile); free(cacertpath); free(certfile); free(certkeyfile); free(certkeypwd); } void getmainconfig(const char *configfile) { FILE *f; char *loglevel = NULL; f = openconfigfile(configfile); memset(&options, 0, sizeof(options)); getgeneralconfig(f, NULL, "ListenUDP", CONF_STR, &options.listenudp, "ListenTCP", CONF_STR, &options.listentcp, "LogLevel", CONF_STR, &loglevel, "LogDestination", CONF_STR, &options.logdestination, "Client", CONF_CBK, confclsrv_cb, "Server", CONF_CBK, confclsrv_cb, "Realm", CONF_CBK, confrealm_cb, "TLS", CONF_CBK, conftls_cb, NULL ); fclose(f); tlsfree(); if (loglevel) { if (strlen(loglevel) != 1 || *loglevel < '1' || *loglevel > '4') debugx(1, DBG_ERR, "error in %s, value of option LogLevel is %s, must be 1, 2, 3 or 4", configfile, loglevel); options.loglevel = *loglevel - '0'; free(loglevel); } if (client_udp_count) { udp_server_replyq.replies = malloc(client_udp_count * MAX_REQUESTS * sizeof(struct reply)); if (!udp_server_replyq.replies) debugx(1, DBG_ERR, "malloc failed"); udp_server_replyq.size = client_udp_count * MAX_REQUESTS; udp_server_replyq.count = 0; pthread_mutex_init(&udp_server_replyq.count_mutex, NULL); pthread_cond_init(&udp_server_replyq.count_cond, NULL); } } void getargs(int argc, char **argv, uint8_t *foreground, uint8_t *loglevel, char **configfile) { int c; while ((c = getopt(argc, argv, "c:d:fv")) != -1) { switch (c) { case 'c': *configfile = optarg; break; case 'd': if (strlen(optarg) != 1 || *optarg < '1' || *optarg > '4') debugx(1, DBG_ERR, "Debug level must be 1, 2, 3 or 4, not %s", optarg); *loglevel = *optarg - '0'; break; case 'f': *foreground = 1; break; case 'v': debugx(0, DBG_ERR, "radsecproxy 1.0-alpha-p1"); default: goto usage; } } if (!(argc - optind)) return; usage: debug(DBG_ERR, "Usage:\n%s [ -c configfile ] [ -d debuglevel ] [ -f ] [ -v ]", argv[0]); exit(1); } int main(int argc, char **argv) { pthread_t udpserverth; int i; uint8_t foreground = 0, loglevel = 0; char *configfile = NULL; debug_init("radsecproxy"); debug_set_level(DEBUG_LEVEL); getargs(argc, argv, &foreground, &loglevel, &configfile); if (loglevel) debug_set_level(loglevel); debug(DBG_INFO, "radsecproxy 1.0-alpha-p1 starting"); getmainconfig(configfile ? configfile : CONFIG_MAIN); if (loglevel) options.loglevel = loglevel; else if (options.loglevel) debug_set_level(options.loglevel); if (foreground) options.logdestination = NULL; else { if (!options.logdestination) options.logdestination = "x-syslog:///"; debug_set_destination(options.logdestination); } if (!server_count) debugx(1, DBG_ERR, "No servers configured, nothing to do, exiting"); if (!client_count) debugx(1, DBG_ERR, "No clients configured, nothing to do, exiting"); if (!realm_count) debugx(1, DBG_ERR, "No realms configured, nothing to do, exiting"); if (!foreground && (daemon(0, 0) < 0)) debugx(1, DBG_ERR, "daemon() failed: %s", strerror(errno)); if (client_udp_count) { udp_server_listen = server_create('U'); if (pthread_create(&udpserverth, NULL, udpserverrd, NULL)) debugx(1, DBG_ERR, "pthread_create failed"); } for (i = 0; i < server_count; i++) if (pthread_create(&servers[i].clientth, NULL, clientwr, (void *)&servers[i])) debugx(1, DBG_ERR, "pthread_create failed"); if (client_tls_count) { tcp_server_listen = server_create('T'); return tlslistener(); } /* just hang around doing nothing, anything to do here? */ for (;;) sleep(1000); }