diff options
| -rw-r--r-- | Makefile | 9 | ||||
| -rw-r--r-- | radsecproxy.c | 1091 | ||||
| -rw-r--r-- | radsecproxy.h | 90 | ||||
| -rw-r--r-- | util.c | 125 |
4 files changed, 1315 insertions, 0 deletions
diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..a7982bd --- /dev/null +++ b/Makefile @@ -0,0 +1,9 @@ +CFLAGS = -g -Wall -pthread +LDFLAGS = -lssl + +all: radsecproxy + +radsecproxy: util.o + +clean: + rm -f util.o radsecproxy diff --git a/radsecproxy.c b/radsecproxy.c new file mode 100644 index 0000000..8bf77bf --- /dev/null +++ b/radsecproxy.c @@ -0,0 +1,1091 @@ +/* + * Copyright (C) 2006 Stig Venaas <venaas@uninett.no> + * + * 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. + */ + +/* BUGS: + * peers can not yet be specified with literal IPv6 addresses due to port syntax + */ + +/* TODO: + * Among other things: + * timer based client retrans or maybe no retrans and just a timer... + * make our server ignore client retrans? + * tls keep alives + * routing based on id.... + * tls certificate validation +*/ + +/* 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 <netdb.h> +#include <unistd.h> +#include <pthread.h> +#include <openssl/ssl.h> +#include <openssl/rand.h> +#include <openssl/err.h> +#include <openssl/md5.h> +#include "radsecproxy.h" + +static struct peer peers[MAX_PEERS]; +static int peer_count = 0; + +static struct replyq udp_server_replyq; +static int udp_server_sock = -1; +static char *udp_server_port = DEFAULT_UDP_PORT; +static pthread_mutex_t *ssl_locks; +static long *ssl_lock_count; +static SSL_CTX *ssl_ctx_cl; +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]); +} + +void ssl_locks_setup() { + int i; + + 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); +} + +int resolvepeer(struct peer *peer) { + struct addrinfo hints; + + pthread_mutex_lock(&peer->lock); + if (peer->addrinfo) { + /* assume we should re-resolve */ + freeaddrinfo(peer->addrinfo); + peer->addrinfo = NULL; + } + + memset(&hints, 0, sizeof(hints)); + hints.ai_socktype = (peer->type == 'T' ? SOCK_STREAM : SOCK_DGRAM); + hints.ai_family = AF_UNSPEC; + if (getaddrinfo(peer->host, peer->port, &hints, &peer->addrinfo)) { + err("resolvepeer: can't resolve %s port %s", peer->host, peer->port); + peer->addrinfo = NULL; /* probably don't need this */ + pthread_mutex_unlock(&peer->lock); + return 0; + } + pthread_mutex_unlock(&peer->lock); + return 1; +} + +int connecttopeer(struct peer *peer) { + int s; + struct addrinfo *res; + + if (!peer->addrinfo) { + resolvepeer(peer); + if (!peer->addrinfo) { + printf("connecttopeer: can't resolve %s into address to connect to\n", peer->host); + return -1; + } + } + + for (res = peer->addrinfo; res; res = res->ai_next) { + s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); + if (s < 0) { + err("connecttopeer: socket failed"); + continue; + } + if (connect(s, res->ai_addr, res->ai_addrlen) == 0) + break; + err("connecttopeer: connect failed"); + close(s); + s = -1; + } + return s; +} + +/* returns the peer with matching address, or NULL */ +/* if peer argument is not NULL, we only check that one peer */ +struct peer *find_peer(char type, struct sockaddr *addr, struct peer *peer) { + struct sockaddr_in6 *sa6; + struct in_addr *a4 = NULL; + struct peer *p; + 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; + + p = (peer ? peer : peers); + for (i = 0; i < peer_count; i++) { + if (p->type == type) + for (res = p->addrinfo; res; res = res->ai_next) + if ((a4 && res->ai_family == AF_INET && + !memcmp(a4, &((struct sockaddr_in *)res->ai_addr)->sin_addr, 4)) || + (res->ai_family == AF_INET6 && + !memcmp(&sa6->sin6_addr, &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr, 16))) + return p; + if (peer) + break; + p++; + } + return 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 peer **peer, struct sockaddr_storage *sa) { + int cnt, len; + struct peer *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) { + err("radudpget: recv failed"); + continue; + } + printf("radudpget: got %d bytes from %s\n", cnt, addr2string((struct sockaddr *)&from, fromlen)); + + if (cnt < 20) { + printf("radudpget: packet too small\n"); + continue; + } + + len = RADLEN(buf); + + if (cnt < len) { + printf("radudpget: packet smaller than length field in radius header\n"); + continue; + } + if (cnt > len) + printf("radudpget: packet was padded with %d bytes\n", cnt - len); + + f = find_peer('U', (struct sockaddr *)&from, *peer); + if (!f) { + printf("radudpget: got packet from wrong or unknown UDP peer, ignoring\n"); + continue; + } + + rad = malloc(len); + if (rad) + break; + err("radudpget: malloc failed"); + } + memcpy(rad, buf, len); + *peer = f; /* only need this if *peer == NULL, but if not NULL *peer == f here */ + if (sa) + *sa = from; + return rad; +} + +void tlsconnect(struct peer *peer, int oldsock, char *text) { + unsigned int sleeptime, try = 0; + + pthread_mutex_lock(&peer->lock); + if (peer->sockcl != oldsock) { + /* already reconnected, nothing to do */ + printf("reconnect: seems already reconnected\n"); + pthread_mutex_unlock(&peer->lock); + return; + } + + printf("tlsconnect %d %s\n", oldsock, text); + sleep(1); + for (;;) { + printf("tlsconnect: trying to open TLS connection to %s port %s\n", peer->host, peer->port); + if ((peer->sockcl = connecttopeer(peer)) >= 0) + break; + try++; + if (try < 6) + sleeptime = 10; + else if (try < 20) + sleeptime = 60; + else + sleeptime = 900; + /* should possibly re-resolve host addresses at some point */ + printf("tlsconnect: can't connect, retry #%d in %ds\n", try, sleeptime); + sleep(sleeptime); + } + + SSL_free(peer->sslcl); + peer->sslcl = SSL_new(ssl_ctx_cl); + SSL_set_fd(peer->sslcl, peer->sockcl); + /* must close oldsock after get new socket so that they are always different */ + if (oldsock >= 0) + close(oldsock); + SSL_connect(peer->sslcl); + printf("tlsconnect: TLS connection to %s port %s up\n", peer->host, peer->port); + pthread_mutex_unlock(&peer->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) { + printf("radtlsget: connection lost\n"); + return NULL; + } + } + + len = RADLEN(buf); + rad = malloc(len); + if (!rad) { + 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) { + printf("radtlsget: connection lost\n"); + free(rad); + return NULL; + } + } + + if (total >= 20) + break; + + free(rad); + printf("radtlsget: packet smaller than minimum radius size\n"); + } + + printf("radtlsget: got %d bytes\n", total); + return rad; +} + +int clientradput(struct peer *peer, unsigned char *rad) { + int cnt, s; + size_t len; + unsigned long error; + + len = RADLEN(rad); + if (peer->type == 'U') { + if (send(peer->sockcl, rad, len, 0) >= 0) { + printf("clienradput: sent UDP of length %d to %s port %s\n", len, peer->host, peer->port); + return 1; + } + err("clientradput: send failed"); + return 0; + } + + s = peer->sockcl; + while ((cnt = SSL_write(peer->sslcl, rad, len)) <= 0) { + while ((error = ERR_get_error())) + err("clientwr: TLS: %s", ERR_error_string(error, NULL)); + tlsconnect(peer, s, "clientradput"); + s = peer->sockcl; + } + + printf("clientradput: Sent %d bytes, Radius packet of length %d to TLS peer %s\n", + cnt, len, 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(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(sec)) && + EVP_DigestFinal_ex(&mdctx, hash, &len) && + len == 16 && + !memcmp(hash, rad + 4, 16)); + pthread_mutex_unlock(&lock); + return result; +} + +void sendrq(struct peer *to, struct peer *from, struct request *rq) { + int i; + + pthread_mutex_lock(&to->newrq_mutex); + for (i = 0; i < MAX_REQUESTS; i++) + if (!to->requests[i].buf) + break; + if (i == MAX_REQUESTS) { + printf("No room in queue, dropping request\n"); + pthread_mutex_unlock(&to->newrq_mutex); + return; + } + + rq->buf[1] = (char)i; + to->requests[i] = *rq; + + if (!to->newrq) { + to->newrq = 1; + printf("signalling client writer\n"); + pthread_cond_signal(&to->newrq_cond); + } + pthread_mutex_unlock(&to->newrq_mutex); +} + +void sendreply(struct peer *to, struct peer *from, char *buf, struct sockaddr_storage *tosa) { + struct replyq *replyq = to->replyq; + + pthread_mutex_lock(&replyq->count_mutex); + if (replyq->count == replyq->size) { + printf("No room in queue, dropping request\n"); + pthread_mutex_unlock(&replyq->count_mutex); + return; + } + + replyq->replies[replyq->count].buf = buf; + if (tosa) + replyq->replies[replyq->count].tosa = *tosa; + replyq->count++; + + if (replyq->count == 1) { + printf("signalling client writer\n"); + pthread_cond_signal(&replyq->count_cond); + } + pthread_mutex_unlock(&replyq->count_mutex); +} + +int pwdcrypt(uint8_t *plain, uint8_t *enc, uint8_t enclen, uint8_t *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; + + 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, 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++) + plain[offset + i] = hash[i] ^ enc[offset + i]; + offset += 16; + if (offset == enclen) + break; + input = enc + offset - 16; + } + pthread_mutex_unlock(&lock); + return 1; +} + +struct peer *radsrv(struct request *rq, char *buf, struct peer *from) { + uint8_t code, id, *auth, *attr, *usernameattr = NULL, *userpwdattr = NULL, pwd[128], pwdlen; + int i; + uint16_t len; + int left; + struct peer *to; + unsigned char newauth[16]; + + code = *(uint8_t *)buf; + id = *(uint8_t *)(buf + 1); + len = RADLEN(buf); + auth = (uint8_t *)(buf + 4); + + printf("radsrv: code %d, id %d, length %d\n", code, id, len); + + if (code != RAD_Access_Request) { + printf("radsrv: server currently accepts only access-requests, ignoring\n"); + return NULL; + } + + left = len - 20; + attr = buf + 20; + + while (left > 1) { + left -= attr[RAD_Attr_Length]; + if (left < 0) { + printf("radsrv: attribute length exceeds packet length, ignoring packet\n"); + return NULL; + } + switch (attr[RAD_Attr_Type]) { + case RAD_Attr_User_Name: + usernameattr = attr; + break; + case RAD_Attr_User_Password: + userpwdattr = attr; + break; + } + attr += attr[RAD_Attr_Length]; + } + if (left) + printf("radsrv: malformed packet? remaining byte after last attribute\n"); + + if (usernameattr) { + printf("radsrv: Username: "); + for (i = 0; i < usernameattr[RAD_Attr_Length]; i++) + printf("%c", usernameattr[RAD_Attr_Value + i]); + printf("\n"); + } + + /* find out where to send the packet, for now we send to first connected + TLS peer if UDP, and first UDP peer if TLS */ + + i = peer_count; + switch (from->type) { + case 'U': + for (i = 0; i < peer_count; i++) + if (peers[i].type == 'T' && peers[i].sockcl >= 0) + break; + break; + case 'T': + for (i = 0; i < peer_count; i++) + if (peers[i].type == 'U') + break; + break; + } + + if (i == peer_count) { + printf("radsrv: ignoring request, don't know where to send it\n"); + return NULL; + } + + to = &peers[i]; + + if (!RAND_bytes(newauth, 16)) { + printf("radsrv: failed to generate random auth\n"); + return NULL; + } + + if (userpwdattr) { + printf("radsrv: found userpwdattr of length %d\n", userpwdattr[RAD_Attr_Length]); + pwdlen = userpwdattr[RAD_Attr_Length] - 2; + if (pwdlen < 16 || pwdlen > 128 || pwdlen % 16) { + printf("radsrv: invalid user password length\n"); + return NULL; + } + + if (!pwdcrypt(pwd, &userpwdattr[RAD_Attr_Value], pwdlen, from->secret, strlen(from->secret), auth)) { + printf("radsrv: cannot decrypt password\n"); + return NULL; + } + printf("radsrv: password: "); + for (i = 0; i < pwdlen; i++) + printf("%02x ", pwd[i]); + printf("\n"); + if (!pwdcrypt(&userpwdattr[RAD_Attr_Value], pwd, pwdlen, to->secret, strlen(to->secret), newauth)) { + printf("radsrv: cannot encrypt password\n"); + return NULL; + } + } + + rq->buf = buf; + rq->from = from; + rq->origid = id; + memcpy(rq->origauth, auth, 16); + memcpy(rq->buf + 4, newauth, 16); + return to; +} + +void *clientrd(void *arg) { + struct peer *from, *peer = (struct peer *)arg; + int i, s; + unsigned char *buf; + struct sockaddr_storage fromsa; + + for (;;) { + s = peer->sockcl; + buf = (peer->type == 'U' ? radudpget(s, &peer, NULL) : radtlsget(peer->sslcl)); + if (!buf && peer->type == 'T') { + printf("retry in 60s\n"); + sleep(60); /* should have exponential backoff perhaps, better do it inside radtlsget */ + tlsconnect(peer, s, "clientrd"); + continue; + } + + i = buf[1]; /* i is the id */ + + pthread_mutex_lock(&peer->newrq_mutex); + if (!peer->requests[i].buf || !peer->requests[i].tries) { + pthread_mutex_unlock(&peer->newrq_mutex); + printf("clientrd: no matching request sent with this id, ignoring\n"); + continue; + } + + if (peer->requests[i].received) { + pthread_mutex_unlock(&peer->newrq_mutex); + printf("clientrd: already received, ignoring\n"); + continue; + } + + if (!validauth(buf, peer->requests[i].buf + 4, peer->secret)) { + pthread_mutex_unlock(&peer->newrq_mutex); + printf("clientrd: invalid auth, ignoring\n"); + continue; + } + + /* once we set received = 1, requests[i] may be reused */ + buf[1] = (char)peer->requests[i].origid; + memcpy(buf + 4, peer->requests[i].origauth, 16); + from = peer->requests[i].from; + if (from->type == 'U') + fromsa = peer->requests[i].fromsa; + peer->requests[i].received = 1; + pthread_mutex_unlock(&peer->newrq_mutex); + + if (!radsign(buf, from->secret)) { + printf("clientrd: failed to sign message\n"); + continue; + } + + printf("clientrd: giving packet back to where it came from\n"); + sendreply(from, peer, buf, from->type == 'U' ? &fromsa : NULL); + } +} + +void *clientwr(void *arg) { + struct peer *peer = (struct peer *)arg; + pthread_t clientrdth; + int i; + + if (peer->type == 'U') { + if ((peer->sockcl = connecttopeer(peer)) < 0) { + printf("clientwr: connecttopeer failed\n"); + exit(1); + } + } else + tlsconnect(peer, -1, "new client"); + + if (pthread_create(&clientrdth, NULL, clientrd, (void *)peer)) + errx("clientwr: pthread_create failed"); + + for (;;) { + pthread_mutex_lock(&peer->newrq_mutex); + while (!peer->newrq) { + printf("clientwr: waiting for signal\n"); + pthread_cond_wait(&peer->newrq_cond, &peer->newrq_mutex); + printf("clientwr: got signal\n"); + } + peer->newrq = 0; + pthread_mutex_unlock(&peer->newrq_mutex); + + for (i = 0; i < MAX_REQUESTS; i++) { + pthread_mutex_lock(&peer->newrq_mutex); + while (!peer->requests[i].buf && i < MAX_REQUESTS) + i++; + if (i == MAX_REQUESTS) { + pthread_mutex_unlock(&peer->newrq_mutex); + break; + } + + /* already received or too many tries */ + if (peer->requests[i].received || peer->requests[i].tries > 2) { + free(peer->requests[i].buf); + /* setting this to NULL means that it can be reused */ + peer->requests[i].buf = NULL; + pthread_mutex_unlock(&peer->newrq_mutex); + continue; + } + pthread_mutex_unlock(&peer->newrq_mutex); + + peer->requests[i].tries++; + clientradput(peer, peer->requests[i].buf); + } + } + /* should do more work to maintain TLS connections, keepalives etc */ +} + +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) { + printf("udp server writer, waiting for signal\n"); + pthread_cond_wait(&replyq->count_cond, &replyq->count_mutex); + printf("udp server writer, got signal\n"); + } + 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) + err("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; + unsigned char *buf; + struct peer *to, *fr; + pthread_t udpserverwrth; + + if ((udp_server_sock = bindport(SOCK_DGRAM, udp_server_port)) < 0) { + printf("udpserverrd: socket/bind failed\n"); + exit(1); + } + printf("udpserverrd: listening on UDP port %s\n", udp_server_port); + + if (pthread_create(&udpserverwrth, NULL, udpserverwr, NULL)) + errx("pthread_create failed"); + + for (;;) { + fr = NULL; + memset(&rq, 0, sizeof(struct request)); + buf = radudpget(udp_server_sock, &fr, &rq.fromsa); + to = radsrv(&rq, buf, fr); + if (!to) { + printf("udpserverrd: ignoring request, no place to send it\n"); + continue; + } + sendrq(to, fr, &rq); + } +} + +void *tlsserverwr(void *arg) { + int cnt; + unsigned long error; + struct peer *peer = (struct peer *)arg; + struct replyq *replyq; + + pthread_mutex_lock(&peer->replycount_mutex); + for (;;) { + replyq = peer->replyq; + while (!replyq->count) { + printf("tls server writer, waiting for signal\n"); + pthread_cond_wait(&replyq->count_cond, &replyq->count_mutex); + printf("tls server writer, got signal\n"); + } + pthread_mutex_unlock(&replyq->count_mutex); + cnt = SSL_write(peer->sslsrv, replyq->replies->buf, RADLEN(replyq->replies->buf)); + if (cnt > 0) + printf("tlsserverwr: Sent %d bytes, Radius packet of length %d\n", + cnt, RADLEN(replyq->replies->buf)); + else + while ((error = ERR_get_error())) + 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; + char unsigned *buf; + unsigned long error; + struct peer *to; + int s; + struct peer *peer = (struct peer *)arg; + pthread_t tlsserverwrth; + + printf("tlsserverrd starting\n"); + if (SSL_accept(peer->sslsrv) <= 0) { + while ((error = ERR_get_error())) + err("tlsserverrd: SSL: %s", ERR_error_string(error, NULL)); + errx("accept failed, child exiting"); + } + + if (pthread_create(&tlsserverwrth, NULL, tlsserverwr, (void *)peer)) + errx("pthread_create failed"); + + for (;;) { + buf = radtlsget(peer->sslsrv); + if (!buf) { + printf("tlsserverrd: connection lost\n"); + s = SSL_get_fd(peer->sslsrv); + SSL_free(peer->sslsrv); + peer->sslsrv = NULL; + if (s >= 0) + close(s); + pthread_exit(NULL); + } + printf("tlsserverrd: got Radius message from %s\n", peer->host); + memset(&rq, 0, sizeof(struct request)); + to = radsrv(&rq, buf, peer); + if (!to) { + printf("ignoring request, no place to send it\n"); + continue; + } + sendrq(to, peer, &rq); + } +} + +int tlslistener(SSL_CTX *ssl_ctx) { + pthread_t tlsserverth; + int s, snew; + struct sockaddr_storage from; + size_t fromlen = sizeof(from); + struct peer *peer; + + if ((s = bindport(SOCK_STREAM, DEFAULT_TLS_PORT)) < 0) { + printf("tlslistener: socket/bind failed\n"); + exit(1); + } + + listen(s, 0); + printf("listening for incoming TLS on port %s\n", DEFAULT_TLS_PORT); + + for (;;) { + snew = accept(s, (struct sockaddr *)&from, &fromlen); + if (snew < 0) + errx("accept failed"); + printf("incoming TLS connection from %s\n", addr2string((struct sockaddr *)&from, fromlen)); + + peer = find_peer('T', (struct sockaddr *)&from, NULL); + if (!peer) { + printf("ignoring request, not a known TLS peer\n"); + close(snew); + continue; + } + + if (peer->sslsrv) { + printf("Ignoring incoming connection, already have one from this peer\n"); + close(snew); + continue; + } + peer->sslsrv = SSL_new(ssl_ctx); + SSL_set_fd(peer->sslsrv, snew); + if (pthread_create(&tlsserverth, NULL, tlsserverrd, (void *)peer)) + errx("pthread_create failed"); + + for (;;) { + /* currently only one server thread, so just halt here */ + sleep(1000); + } + } + return 0; +} + +char *parsehostport(char *s, char **host, char **port) { + 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 != ']') { + printf("no ] matching initial [\n"); + exit(1); + } + ipv6 = 1; + } else { + field = p; + for (; *p && *p != ':' && *p != ' ' && *p != '\t' && *p != '\n'; p++); + } + if (field == p) { + printf("missing host/address\n"); + exit(1); + } + *host = malloc(p - field + 1); + if (!*host) + errx("malloc failed"); + memcpy(*host, field, p - field); + (*host)[p - field] = '\0'; + if (ipv6) { + p++; + if (*p && *p != ':' && *p != ' ' && *p != '\t' && *p != '\n') { + printf("unexpected character after ]\n"); + exit(1); + } + } + if (*p == ':') { + /* port number or service name is specified */; + field = p++; + for (; *p && *p != ' ' && *p != '\t' && *p != '\n'; p++); + if (field == p) { + printf("syntax error, : but no following port\n"); + exit(1); + } + *port = malloc(p - field + 1); + if (!*port) + errx("malloc failed"); + memcpy(*port, field, p - field); + (*port)[p - field ] = '\0'; + } else + *port = NULL; + return p; +} + +void getconfig(const char *filename) { + FILE *f; + char line[1024]; + char *p, *field; + struct peer *peer; + + peer_count = 0; + + udp_server_replyq.replies = malloc(4 * MAX_REQUESTS * sizeof(struct reply)); + if (!udp_server_replyq.replies) + errx("malloc failed"); + udp_server_replyq.size = 4 * 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); + + f = fopen(filename, "r"); + if (!f) + errx("getconfig failed to open %s for reading", filename); + + while (fgets(line, 1024, f) && peer_count < MAX_PEERS) { + peer = &peers[peer_count]; + memset(peer, 0, sizeof(struct peer)); + + for (p = line; *p == ' ' || *p == '\t'; p++); + if (*p == '#' || *p == '\n') + continue; + if (*p != 'U' && *p != 'T') { + printf("server type must be U or T, got %c\n", *p); + exit(1); + } + peer->type = *p; + for (p++; *p == ' ' || *p == '\t'; p++); + p = parsehostport(p, &peer->host, &peer->port); + if (!peer->port) + peer->port = (peer->type == 'U' ? DEFAULT_UDP_PORT : DEFAULT_TLS_PORT); + for (; *p == ' ' || *p == '\t'; p++); + field = p; + for (; *p && *p != ' ' && *p != '\t' && *p != '\n'; p++); + if (field == p) { + /* no secret set and end of line, line is complete if TLS */ + if (peer->type == 'U') { + printf("secret must be specified for UDP\n"); + exit(1); + } + peer->secret = DEFAULT_TLS_SECRET; + } else { + peer->secret = malloc(p - field + 1); + if (!peer->secret) + errx("malloc failed"); + memcpy(peer->secret, field, p - field); + peer->secret[p - field] = '\0'; + /* check that rest of line only white space */ + for (; *p == ' ' || *p == '\t'; p++); + if (*p && *p != '\n') { + printf("max 3 fields per line, found a 4th\n"); + exit(1); + } + } + peer->sockcl = -1; + peer->sslsrv = NULL; + peer->sslcl = NULL; + pthread_mutex_init(&peer->lock, NULL); + if (!resolvepeer(peer)) { + printf("failed to resolve host %s port %s, exiting\n", peer->host, peer->port); + exit(1); + } + peer->requests = malloc(MAX_REQUESTS * sizeof(struct request)); + if (!peer->requests) + errx("malloc failed"); + memset(peer->requests, 0, MAX_REQUESTS * sizeof(struct request)); + peer->newrq = 0; + pthread_mutex_init(&peer->newrq_mutex, NULL); + pthread_cond_init(&peer->newrq_cond, NULL); + + if (peer->type == 'U') + peer->replyq = &udp_server_replyq; + else { + peer->replyq = malloc(sizeof(struct replyq)); + if (!peer->replyq) + errx("malloc failed"); + peer->replyq->replies = malloc(MAX_REQUESTS * sizeof(struct reply)); + if (!peer->replyq->replies) + errx("malloc failed"); + peer->replyq->size = MAX_REQUESTS; + peer->replyq->count = 0; + pthread_mutex_init(&peer->replyq->count_mutex, NULL); + pthread_cond_init(&peer->replyq->count_cond, NULL); + } + printf("got type %c, host %s, port %s, secret %s\n", peers[peer_count].type, + peers[peer_count].host, peers[peer_count].port, peers[peer_count].secret); + peer_count++; + } + fclose(f); +} + +void parseargs(int argc, char **argv) { + int c; + + while ((c = getopt(argc, argv, "p:")) != -1) { + switch (c) { + case 'p': + udp_server_port = optarg; + break; + default: + goto usage; + } + } + + return; + + usage: + printf("radsecproxy [ -p UDP-port ]\n"); + exit(1); +} + +int main(int argc, char **argv) { + SSL_CTX *ssl_ctx_srv; + unsigned long error; + pthread_t udpserverth; + pthread_attr_t joinable; + int i; + + parseargs(argc, argv); + getconfig("radsecproxy.conf"); + + ssl_locks_setup(); + + pthread_attr_init(&joinable); + pthread_attr_setdetachstate(&joinable, PTHREAD_CREATE_JOINABLE); + + /* listen on UDP if at least one UDP peer */ + + for (i = 0; i < peer_count; i++) + if (peers[i].type == 'U') { + if (pthread_create(&udpserverth, &joinable, udpserverrd, NULL)) + errx("pthread_create failed"); + break; + } + + for (i = 0; i < peer_count; i++) + if (peers[i].type == 'T') + break; + + if (i == peer_count) { + printf("No TLS peers defined, just doing UDP proxying\n"); + /* just hang around doing nothing, anything to do here? */ + pthread_join(udpserverth, NULL); + return 0; + } + + /* SSL setup */ + 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)); + } + + /* initialise client part and start clients */ + ssl_ctx_cl = SSL_CTX_new(TLSv1_client_method()); + if (!ssl_ctx_cl) + errx("no ssl ctx"); + + for (i = 0; i < peer_count; i++) { + if (pthread_create(&peers[i].clientth, NULL, clientwr, (void *)&peers[i])) + errx("pthread_create failed"); + } + + /* setting up server/daemon part */ + ssl_ctx_srv = SSL_CTX_new(TLSv1_server_method()); + if (!ssl_ctx_srv) + errx("no ssl ctx"); + if (!SSL_CTX_use_certificate_file(ssl_ctx_srv, "/tmp/server.pem", SSL_FILETYPE_PEM)) { + while ((error = ERR_get_error())) + err("SSL: %s", ERR_error_string(error, NULL)); + errx("Failed to load certificate"); + } + if (!SSL_CTX_use_PrivateKey_file(ssl_ctx_srv, "/tmp/server.key", SSL_FILETYPE_PEM)) { + while ((error = ERR_get_error())) + err("SSL: %s", ERR_error_string(error, NULL)); + errx("Failed to load private key"); + } + return tlslistener(ssl_ctx_srv); +} diff --git a/radsecproxy.h b/radsecproxy.h new file mode 100644 index 0000000..27cb1d4 --- /dev/null +++ b/radsecproxy.h @@ -0,0 +1,90 @@ +/* + * Copyright (C) 2006 Stig Venaas <venaas@uninett.no> + * + * 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. + */ + +#define RADLEN(x) ntohs(((uint16_t *)(x))[1]) + +#define SOCKADDR_SIZE(addr) ((addr).ss_family == AF_INET ? \ + sizeof(struct sockaddr_in) : \ + sizeof(struct sockaddr_in6)) + +#define MAX_PEERS 256 +/* MAX_REQUESTS is 256 due to Radius' 8 bit ID field */ +#define MAX_REQUESTS 256 +#define DEFAULT_TLS_SECRET "mysecret" +#define DEFAULT_UDP_PORT "1812" +#define DEFAULT_TLS_PORT "2083" + +#define RAD_Access_Request 1 +#define RAD_Access_Accept 2 +#define RAD_Access_Reject 3 +#define RAD_Accounting_Request 4 +#define RAD_Accounting_Response 5 +#define RAD_Access_Challenge 11 +#define RAD_Status_Server 12 +#define RAD_Status_Client 13 + +#define RAD_Attr_User_Name 1 +#define RAD_Attr_User_Password 2 + +#define RAD_Attr_Type 0 +#define RAD_Attr_Length 1 +#define RAD_Attr_Value 2 + +/* requests that a client will send */ +struct request { + unsigned char *buf; + uint8_t tries; + uint8_t received; + struct timeval timeout; + struct peer *from; + uint8_t origid; /* used by servwr */ + char origauth[16]; /* used by servwr */ + struct sockaddr_storage fromsa; /* used by udpservwr */ +}; + +/* replies that a server will send */ +struct reply { + unsigned char *buf; + struct sockaddr_storage tosa; /* used by udpservwr */ +}; + +struct replyq { + struct reply *replies; + int count; + int size; + pthread_mutex_t count_mutex; + pthread_cond_t count_cond; +}; + +struct peer { + char type; /* U for UDP, T for TLS */ + char *host; + char *port; + char *secret; + SSL *sslcl, *sslsrv; + pthread_mutex_t lock; + pthread_t clientth; + int sockcl; + struct addrinfo *addrinfo; + /* requests and newrq* are requests passed from servers to clients */ + struct request *requests; + uint8_t newrq; + pthread_mutex_t newrq_mutex; + pthread_cond_t newrq_cond; + /* repl* are replies passed from clients to tls servers */ + struct replyq *replyq; + int replycount; + pthread_mutex_t replycount_mutex; + pthread_cond_t replycount_cond; +}; + +void errx(char *format, ...); +void err(char *format, ...); +char *addr2string(struct sockaddr *addr, socklen_t len); +int bindport(int type, char *port); +int connectport(int type, char *host, char *port); @@ -0,0 +1,125 @@ +/* + * Copyright (C) 2006 Stig Venaas <venaas@uninett.no> + * + * 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. + */ + +#include <netdb.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <errno.h> +#include <stdarg.h> + +void errx(char *format, ...) { + extern int errno; + + va_list ap; + va_start(ap, format); + vfprintf(stderr, format, ap); + va_end(ap); + if (errno) { + fprintf(stderr, ": "); + perror(NULL); + fprintf(stderr, "errno=%d\n", errno); + } else + fprintf(stderr, "\n"); + exit(1); +} + +void err(char *format, ...) { + extern int errno; + + va_list ap; + va_start(ap, format); + vfprintf(stderr, format, ap); + va_end(ap); + if (errno) { + fprintf(stderr, ": "); + perror(NULL); + fprintf(stderr, "errno=%d\n", errno); + } else + fprintf(stderr, "\n"); +} + +char *addr2string(struct sockaddr *addr, socklen_t len) { + struct sockaddr_in6 *sa6; + struct sockaddr_in sa4; + static char addr_buf[2][INET6_ADDRSTRLEN]; + static int i = 0; + i = !i; + if (addr->sa_family == AF_INET6) { + sa6 = (struct sockaddr_in6 *)addr; + if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { + memset(&sa4, 0, sizeof(sa4)); + sa4.sin_family = AF_INET; + sa4.sin_port = sa6->sin6_port; + memcpy(&sa4.sin_addr, &sa6->sin6_addr.s6_addr[12], 4); + addr = (struct sockaddr *)&sa4; + } + } + if (getnameinfo(addr, len, addr_buf[i], sizeof(addr_buf[i]), + NULL, 0, NI_NUMERICHOST)) { + err("getnameinfo"); + return NULL; + } + return addr_buf[i]; +} + +int bindport(int type, char *port) { + struct addrinfo hints, *res0, *res; + int s; + + memset(&hints, 0, sizeof(hints)); + hints.ai_socktype = type; + hints.ai_family = AF_UNSPEC; + hints.ai_flags = AI_PASSIVE; + + if (getaddrinfo(NULL, port, &hints, &res0) != 0) { + err("bindport: can't resolve port %s", port); + return -1; + } + for (res = res0; res; res = res->ai_next) { + s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); + if (s >= 0) { + if (bind(s, res->ai_addr, res->ai_addrlen) == 0) + break; + close(s); + s = -1; + } + } + freeaddrinfo(res0); + return s; +} + +int connectport(int type, char *host, char *port) { + struct addrinfo hints, *res0, *res; + int s; + + memset(&hints, 0, sizeof(hints)); + hints.ai_socktype = type; + hints.ai_family = AF_UNSPEC; + + if (getaddrinfo(host, port, &hints, &res0) != 0) { + err("connectport: can't resolve host %s port %s", host, port); + return -1; + } + + for (res = res0; res; res = res->ai_next) { + s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); + if (s < 0) { + err("connectport: socket failed"); + continue; + } + if (connect(s, res->ai_addr, res->ai_addrlen) == 0) + break; + err("connectport: connect failed"); + close(s); + s = -1; + } + freeaddrinfo(res0); + return s; +} |