radsecproxy.c 46.4 KB
Newer Older
venaas's avatar
 
venaas committed
1
2
3
4
5
6
7
8
9
10
11
12
13
/*
 * 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:
14
 * make our server ignore client retrans and do its own instead?
venaas's avatar
venaas committed
15
16
17
18
19
20
21
22
23
24
 * accounting
 * radius keep alives (server status)
 * tls certificate validation, see below urls
 * clean tls shutdown, see http://www.linuxjournal.com/article/4822
 *     and http://www.linuxjournal.com/article/5487
 *     SSL_shutdown() and shutdown()
 *     If shutdown() we may not need REUSEADDR
 * when tls client goes away, ensure that all related threads and state
 *          are removed
 * setsockopt(keepalive...), check if openssl has some keepalive feature
venaas's avatar
 
venaas committed
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
*/

/* 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>
venaas's avatar
venaas committed
52
#include <sys/time.h>
venaas's avatar
 
venaas committed
53
54
55
56
57
#include <pthread.h>
#include <openssl/ssl.h>
#include <openssl/rand.h>
#include <openssl/err.h>
#include <openssl/md5.h>
venaas's avatar
venaas committed
58
#include <openssl/hmac.h>
venaas's avatar
 
venaas committed
59
60
#include "radsecproxy.h"

61
62
63
64
65
static struct client clients[MAX_PEERS];
static struct server servers[MAX_PEERS];

static int client_count = 0;
static int server_count = 0;
venaas's avatar
 
venaas committed
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102

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);
}

venaas's avatar
venaas committed
103
104
105
106
107
108
109
110
void printauth(char *s, unsigned char *t) {
    int i;
    printf("%s:", s);
    for (i = 0; i < 16; i++)
	    printf("%02x ", t[i]);
    printf("\n");
}

venaas's avatar
venaas committed
111
112
int resolvepeer(struct peer *peer) {
    struct addrinfo hints, *addrinfo;
venaas's avatar
 
venaas committed
113
114
    
    memset(&hints, 0, sizeof(hints));
venaas's avatar
venaas committed
115
    hints.ai_socktype = (peer->type == 'T' ? SOCK_STREAM : SOCK_DGRAM);
venaas's avatar
 
venaas committed
116
    hints.ai_family = AF_UNSPEC;
venaas's avatar
venaas committed
117
118
    if (getaddrinfo(peer->host, peer->port, &hints, &addrinfo)) {
	err("resolvepeer: can't resolve %s port %s", peer->host, peer->port);
venaas's avatar
 
venaas committed
119
120
	return 0;
    }
121

venaas's avatar
venaas committed
122
123
124
    if (peer->addrinfo)
	freeaddrinfo(peer->addrinfo);
    peer->addrinfo = addrinfo;
venaas's avatar
 
venaas committed
125
126
127
    return 1;
}	  

128
int connecttoserver(struct addrinfo *addrinfo) {
venaas's avatar
 
venaas committed
129
130
131
    int s;
    struct addrinfo *res;
    
132
    for (res = addrinfo; res; res = res->ai_next) {
venaas's avatar
 
venaas committed
133
134
        s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
        if (s < 0) {
135
            err("connecttoserver: socket failed");
venaas's avatar
 
venaas committed
136
137
138
139
            continue;
        }
        if (connect(s, res->ai_addr, res->ai_addrlen) == 0)
            break;
140
        err("connecttoserver: connect failed");
venaas's avatar
 
venaas committed
141
142
143
144
145
146
        close(s);
        s = -1;
    }
    return s;
}	  

147
148
149
/* 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) {
venaas's avatar
 
venaas committed
150
151
    struct sockaddr_in6 *sa6;
    struct in_addr *a4 = NULL;
152
    struct client *c;
venaas's avatar
 
venaas committed
153
154
155
156
157
158
159
160
161
162
    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;

163
164
    c = (client ? client : clients);
    for (i = 0; i < client_count; i++) {
venaas's avatar
venaas committed
165
166
	if (c->peer.type == type)
	    for (res = c->peer.addrinfo; res; res = res->ai_next)
venaas's avatar
 
venaas committed
167
168
169
170
		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)))
171
172
		    return c;
	if (client)
venaas's avatar
 
venaas committed
173
	    break;
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
	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;
    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++) {
venaas's avatar
venaas committed
197
198
	if (s->peer.type == type)
	    for (res = s->peer.addrinfo; res; res = res->ai_next)
199
200
201
202
203
204
205
206
		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 s;
	if (server)
	    break;
	s++;
venaas's avatar
 
venaas committed
207
208
209
210
    }
    return NULL;
}

211
/* exactly one of client and server must be non-NULL */
venaas's avatar
 
venaas committed
212
213
/* if *peer == NULL we return who we received from, else require it to be from peer */
/* return from in sa if not NULL */
214
unsigned char *radudpget(int s, struct client **client, struct server **server, struct sockaddr_storage *sa) {
venaas's avatar
 
venaas committed
215
    int cnt, len;
216
    void *f;
venaas's avatar
 
venaas committed
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
    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);

243
244
245
	f = (client
	     ? (void *)find_client('U', (struct sockaddr *)&from, *client)
	     : (void *)find_server('U', (struct sockaddr *)&from, *server));
venaas's avatar
 
venaas committed
246
247
248
249
250
251
252
253
254
255
256
	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);
257
258
259
260
    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 */
venaas's avatar
 
venaas committed
261
262
263
264
265
    if (sa)
	*sa = from;
    return rad;
}

266
void tlsconnect(struct server *server, struct timeval *when, char *text) {
venaas's avatar
venaas committed
267
268
269
    struct timeval now;
    time_t elapsed;
    unsigned long error;
venaas's avatar
venaas committed
270

venaas's avatar
venaas committed
271
    printf("tlsconnect called from %s\n", text);
272
273
    pthread_mutex_lock(&server->lock);
    if (when && memcmp(&server->lastconnecttry, when, sizeof(struct timeval))) {
venaas's avatar
 
venaas committed
274
	/* already reconnected, nothing to do */
venaas's avatar
venaas committed
275
	printf("tlsconnect(%s): seems already reconnected\n", text);
276
	pthread_mutex_unlock(&server->lock);
venaas's avatar
 
venaas committed
277
278
279
	return;
    }

venaas's avatar
venaas committed
280
281
    printf("tlsconnect %s\n", text);

venaas's avatar
 
venaas committed
282
    for (;;) {
venaas's avatar
venaas committed
283
	gettimeofday(&now, NULL);
284
285
286
	elapsed = now.tv_sec - server->lastconnecttry.tv_sec;
	if (server->connectionok) {
	    server->connectionok = 0;
venaas's avatar
venaas committed
287
288
289
290
291
	    sleep(10);
	} else if (elapsed < 5)
	    sleep(10);
	else if (elapsed < 600)
	    sleep(elapsed * 2);
venaas's avatar
venaas committed
292
	else if (elapsed < 10000)
venaas's avatar
venaas committed
293
		sleep(900);
venaas's avatar
venaas committed
294
295
	else
	    server->lastconnecttry.tv_sec = now.tv_sec;  // no sleep at startup
venaas's avatar
venaas committed
296
	printf("tlsconnect: trying to open TLS connection to %s port %s\n", server->peer.host, server->peer.port);
297
298
	if (server->sock >= 0)
	    close(server->sock);
venaas's avatar
venaas committed
299
	if ((server->sock = connecttoserver(server->peer.addrinfo)) < 0)
venaas's avatar
venaas committed
300
	    continue;
venaas's avatar
venaas committed
301
302
303
304
	SSL_free(server->peer.ssl);
	server->peer.ssl = SSL_new(ssl_ctx_cl);
	SSL_set_fd(server->peer.ssl, server->sock);
	if (SSL_connect(server->peer.ssl) > 0)
venaas's avatar
 
venaas committed
305
	    break;
venaas's avatar
venaas committed
306
307
	while ((error = ERR_get_error()))
	    err("tlsconnect: TLS: %s", ERR_error_string(error, NULL));
venaas's avatar
 
venaas committed
308
    }
venaas's avatar
venaas committed
309
    printf("tlsconnect: TLS connection to %s port %s up\n", server->peer.host, server->peer.port);
venaas's avatar
venaas committed
310
    gettimeofday(&server->lastconnecttry, NULL);
311
    pthread_mutex_unlock(&server->lock);
venaas's avatar
 
venaas committed
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
}

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;
}

355
int clientradput(struct server *server, unsigned char *rad) {
venaas's avatar
venaas committed
356
    int cnt;
venaas's avatar
 
venaas committed
357
358
    size_t len;
    unsigned long error;
venaas's avatar
venaas committed
359
360
    struct timeval lastconnecttry;
    
venaas's avatar
 
venaas committed
361
    len = RADLEN(rad);
venaas's avatar
venaas committed
362
    if (server->peer.type == 'U') {
363
	if (send(server->sock, rad, len, 0) >= 0) {
venaas's avatar
venaas committed
364
	    printf("clienradput: sent UDP of length %d to %s port %s\n", len, server->peer.host, server->peer.port);
venaas's avatar
 
venaas committed
365
366
367
368
369
370
	    return 1;
	}
	err("clientradput: send failed");
	return 0;
    }

371
    lastconnecttry = server->lastconnecttry;
venaas's avatar
venaas committed
372
    while ((cnt = SSL_write(server->peer.ssl, rad, len)) <= 0) {
venaas's avatar
 
venaas committed
373
374
	while ((error = ERR_get_error()))
	    err("clientwr: TLS: %s", ERR_error_string(error, NULL));
375
376
	tlsconnect(server, &lastconnecttry, "clientradput");
	lastconnecttry = server->lastconnecttry;
venaas's avatar
 
venaas committed
377
    }
venaas's avatar
venaas committed
378

379
    server->connectionok = 1;
venaas's avatar
 
venaas committed
380
    printf("clientradput: Sent %d bytes, Radius packet of length %d to TLS peer %s\n",
venaas's avatar
venaas committed
381
	   cnt, len, server->peer.host);
venaas's avatar
 
venaas committed
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
    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;
}
	      
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
int checkmessageauth(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);
venaas's avatar
venaas committed
454
    memcpy(authattr, auth, 16);
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
    if (md_len != 16) {
	printf("message auth computation failed\n");
	pthread_mutex_unlock(&lock);
	return 0;
    }

    if (memcmp(auth, hash, 16)) {
	printf("message authenticator, wrong value\n");
	pthread_mutex_unlock(&lock);
	return 0;
    }	
	
    pthread_mutex_unlock(&lock);
    return 1;
}

int createmessageauth(char *rad, 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) {
	printf("message auth computation failed\n");
	pthread_mutex_unlock(&lock);
	return 0;
    }

    pthread_mutex_unlock(&lock);
    return 1;
}

501
void sendrq(struct server *to, struct client *from, struct request *rq) {
venaas's avatar
 
venaas committed
502
    int i;
503
    
venaas's avatar
 
venaas committed
504
    pthread_mutex_lock(&to->newrq_mutex);
venaas's avatar
venaas committed
505
506
    /* might simplify if only try nextid, might be ok */
    for (i = to->nextid; i < MAX_REQUESTS; i++)
venaas's avatar
 
venaas committed
507
508
509
	if (!to->requests[i].buf)
	    break;
    if (i == MAX_REQUESTS) {
venaas's avatar
venaas committed
510
511
512
513
514
515
516
517
	for (i = 0; i < to->nextid; i++)
	    if (!to->requests[i].buf)
		break;
	if (i == to->nextid) {
	    printf("No room in queue, dropping request\n");
	    pthread_mutex_unlock(&to->newrq_mutex);
	    return;
	}
venaas's avatar
 
venaas committed
518
    }
venaas's avatar
venaas committed
519
520
    
    to->nextid = i + 1;
venaas's avatar
 
venaas committed
521
    rq->buf[1] = (char)i;
venaas's avatar
venaas committed
522
    printf("sendrq: inserting packet with id %d in queue for %s\n", i, to->peer.host);
venaas's avatar
venaas committed
523
    
524
525
    if (!createmessageauth(rq->buf, rq->messageauthattrval, to->peer.secret))
	return;
venaas's avatar
venaas committed
526

527
528
    gettimeofday(&rq->expiry, NULL);
    rq->expiry.tv_sec += 30;
venaas's avatar
 
venaas committed
529
530
531
532
533
534
535
536
537
538
    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);
}

539
void sendreply(struct client *to, struct server *from, char *buf, struct sockaddr_storage *tosa) {
venaas's avatar
 
venaas committed
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
    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);
}

venaas's avatar
venaas committed
561
int pwdencrypt(uint8_t *in, uint8_t len, uint8_t *shared, uint8_t sharedlen, uint8_t *auth) {
venaas's avatar
venaas committed
562
563
564
565
566
    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;
venaas's avatar
venaas committed
567
    uint8_t i, offset = 0, out[128];
venaas's avatar
venaas committed
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
    
    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++)
	    out[offset + i] = hash[i] ^ in[offset + i];
	input = out + offset - 16;
	offset += 16;
	if (offset == len)
	    break;
    }
venaas's avatar
venaas committed
592
    memcpy(in, out, len);
venaas's avatar
venaas committed
593
594
595
596
    pthread_mutex_unlock(&lock);
    return 1;
}

venaas's avatar
venaas committed
597
int pwddecrypt(uint8_t *in, uint8_t len, uint8_t *shared, uint8_t sharedlen, uint8_t *auth) {
venaas's avatar
 
venaas committed
598
599
600
601
602
    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;
venaas's avatar
venaas committed
603
    uint8_t i, offset = 0, out[128];
venaas's avatar
 
venaas committed
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
    
    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++)
venaas's avatar
venaas committed
622
623
	    out[offset + i] = hash[i] ^ in[offset + i];
	input = in + offset;
venaas's avatar
 
venaas committed
624
	offset += 16;
venaas's avatar
venaas committed
625
	if (offset == len)
venaas's avatar
 
venaas committed
626
627
	    break;
    }
venaas's avatar
venaas committed
628
    memcpy(in, out, len);
venaas's avatar
 
venaas committed
629
630
631
632
    pthread_mutex_unlock(&lock);
    return 1;
}

venaas's avatar
venaas committed
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
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) {
venaas's avatar
venaas committed
684
#if 0	
venaas's avatar
venaas committed
685
686
687
688
	printf("text + offset - 16 c(%d): ", offset / 16);
	for (i = 0; i < 16; i++)
	    printf("%02x ", (text + offset - 16)[i]);
	printf("\n");
venaas's avatar
venaas committed
689
#endif
venaas's avatar
venaas committed
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
	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;
}

809
struct server *id2server(char *id, uint8_t len) {
venaas's avatar
venaas committed
810
    int i;
venaas's avatar
venaas committed
811
    char **realm, *idrealm;
venaas's avatar
venaas committed
812

venaas's avatar
venaas committed
813
    idrealm = strchr(id, '@');
venaas's avatar
venaas committed
814
    if (idrealm) {
venaas's avatar
venaas committed
815
	idrealm++;
venaas's avatar
venaas committed
816
817
818
819
820
	len -= idrealm - id;
    } else {
	idrealm = "-";
	len = 1;
    }
821
822
    for (i = 0; i < server_count; i++) {
	for (realm = servers[i].realms; *realm; realm++) {
venaas's avatar
venaas committed
823
824
	    if ((strlen(*realm) == 1 && **realm == '*') ||
		(strlen(*realm) == len && !memcmp(idrealm, *realm, len))) {
venaas's avatar
venaas committed
825
		printf("found matching realm: %s, host %s\n", *realm, servers[i].peer.host);
826
		return servers + i;
venaas's avatar
venaas committed
827
828
829
830
831
832
	    }
	}
    }
    return NULL;
}

833
struct server *radsrv(struct request *rq, char *buf, struct client *from) {
venaas's avatar
venaas committed
834
    uint8_t code, id, *auth, *attr, attrvallen;
venaas's avatar
   
venaas committed
835
    uint8_t *usernameattr = NULL, *userpwdattr = NULL, *tunnelpwdattr = NULL, *messageauthattr = NULL;
venaas's avatar
 
venaas committed
836
837
838
    int i;
    uint16_t len;
    int left;
839
    struct server *to;
venaas's avatar
 
venaas committed
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
    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;
venaas's avatar
   
venaas committed
870
871
872
873
874
875
	case RAD_Attr_Tunnel_Password:
	    tunnelpwdattr = attr;
	    break;
	case RAD_Attr_Message_Authenticator:
	    messageauthattr = attr;
	    break;
venaas's avatar
 
venaas committed
876
877
878
879
880
881
882
883
	}
	attr += attr[RAD_Attr_Length];
    }
    if (left)
	printf("radsrv: malformed packet? remaining byte after last attribute\n");

    if (usernameattr) {
	printf("radsrv: Username: ");
venaas's avatar
venaas committed
884
	for (i = 0; i < usernameattr[RAD_Attr_Length] - 2; i++)
venaas's avatar
 
venaas committed
885
886
887
888
	    printf("%c", usernameattr[RAD_Attr_Value + i]);
	printf("\n");
    }

889
    to = id2server(&usernameattr[RAD_Attr_Value], usernameattr[RAD_Attr_Length] - 2);
venaas's avatar
venaas committed
890
891
892
    if (!to) {
	printf("radsrv: ignoring request, don't know where to send it\n");
	return NULL;
venaas's avatar
venaas committed
893
    }
venaas's avatar
venaas committed
894
    
venaas's avatar
   
venaas committed
895
    if (messageauthattr && (messageauthattr[RAD_Attr_Length] != 18 ||
896
			    !checkmessageauth(buf, &messageauthattr[RAD_Attr_Value], from->peer.secret))) {
venaas's avatar
   
venaas committed
897
898
899
900
	printf("radsrv: message authentication failed\n");
	return NULL;
    }

venaas's avatar
venaas committed
901
902
903
904
905
906
907
908
    if (!RAND_bytes(newauth, 16)) {
	printf("radsrv: failed to generate random auth\n");
	return NULL;
    }

    printauth("auth", auth);
    printauth("newauth", newauth);
    
venaas's avatar
 
venaas committed
909
910
    if (userpwdattr) {
	printf("radsrv: found userpwdattr of length %d\n", userpwdattr[RAD_Attr_Length]);
venaas's avatar
   
venaas committed
911
912
913
914
915
916
	attrvallen = userpwdattr[RAD_Attr_Length] - 2;
	if (attrvallen < 16 || attrvallen > 128 || attrvallen % 16) {
	    printf("radsrv: invalid user password length\n");
	    return NULL;
	}
	
venaas's avatar
venaas committed
917
	if (!pwddecrypt(&userpwdattr[RAD_Attr_Value], attrvallen, from->peer.secret, strlen(from->peer.secret), auth)) {
venaas's avatar
   
venaas committed
918
919
920
921
922
	    printf("radsrv: cannot decrypt password\n");
	    return NULL;
	}
	printf("radsrv: password: ");
	for (i = 0; i < attrvallen; i++)
venaas's avatar
venaas committed
923
	    printf("%02x ", userpwdattr[RAD_Attr_Value + i]);
venaas's avatar
   
venaas committed
924
	printf("\n");
venaas's avatar
venaas committed
925
	if (!pwdencrypt(&userpwdattr[RAD_Attr_Value], attrvallen, to->peer.secret, strlen(to->peer.secret), newauth)) {
venaas's avatar
   
venaas committed
926
927
928
929
930
931
932
933
934
	    printf("radsrv: cannot encrypt password\n");
	    return NULL;
	}
    }

    if (tunnelpwdattr) {
	printf("radsrv: found tunnelpwdattr of length %d\n", tunnelpwdattr[RAD_Attr_Length]);
	attrvallen = tunnelpwdattr[RAD_Attr_Length] - 2;
	if (attrvallen < 16 || attrvallen > 128 || attrvallen % 16) {
venaas's avatar
 
venaas committed
935
936
937
938
	    printf("radsrv: invalid user password length\n");
	    return NULL;
	}
	
venaas's avatar
venaas committed
939
	if (!pwddecrypt(&tunnelpwdattr[RAD_Attr_Value], attrvallen, from->peer.secret, strlen(from->peer.secret), auth)) {
venaas's avatar
 
venaas committed
940
941
942
943
	    printf("radsrv: cannot decrypt password\n");
	    return NULL;
	}
	printf("radsrv: password: ");
venaas's avatar
   
venaas committed
944
	for (i = 0; i < attrvallen; i++)
venaas's avatar
venaas committed
945
	    printf("%02x ", tunnelpwdattr[RAD_Attr_Value + i]);
venaas's avatar
 
venaas committed
946
	printf("\n");
venaas's avatar
venaas committed
947
	if (!pwdencrypt(&tunnelpwdattr[RAD_Attr_Value], attrvallen, to->peer.secret, strlen(to->peer.secret), newauth)) {
venaas's avatar
 
venaas committed
948
949
950
951
952
953
954
955
	    printf("radsrv: cannot encrypt password\n");
	    return NULL;
	}
    }

    rq->buf = buf;
    rq->from = from;
    rq->origid = id;
956
    rq->messageauthattrval = (messageauthattr ? &messageauthattr[RAD_Attr_Value] : NULL);
venaas's avatar
 
venaas committed
957
    memcpy(rq->origauth, auth, 16);
venaas's avatar
venaas committed
958
959
960
    memcpy(auth, newauth, 16);
    printauth("rq->origauth", rq->origauth);
    printauth("auth", auth);
venaas's avatar
 
venaas committed
961
962
963
964
    return to;
}

void *clientrd(void *arg) {
965
966
    struct server *server = (struct server *)arg;
    struct client *from;
venaas's avatar
venaas committed
967
968
    int i, left, subleft;
    unsigned char *buf, *messageauthattr, *subattr, *attr;
venaas's avatar
 
venaas committed
969
    struct sockaddr_storage fromsa;
venaas's avatar
venaas committed
970
    struct timeval lastconnecttry;
venaas's avatar
venaas committed
971
    char tmp[255];
venaas's avatar
 
venaas committed
972
973
    
    for (;;) {
venaas's avatar
venaas committed
974
    getnext:
975
	lastconnecttry = server->lastconnecttry;
venaas's avatar
venaas committed
976
977
	buf = (server->peer.type == 'U' ? radudpget(server->sock, NULL, &server, NULL) : radtlsget(server->peer.ssl));
	if (!buf && server->peer.type == 'T') {
978
	    tlsconnect(server, &lastconnecttry, "clientrd");
venaas's avatar
 
venaas committed
979
980
	    continue;
	}
981
982
    
	server->connectionok = 1;
983
984
985
986
987

	if (*buf != RAD_Access_Accept && *buf != RAD_Access_Reject && *buf != RAD_Access_Challenge) {
	    printf("clientrd: discarding, only accept access accept, access reject and access challenge messages\n");
	    continue;
	}
venaas's avatar
 
venaas committed
988
989
990
	
	i = buf[1]; /* i is the id */

991
992
993
	pthread_mutex_lock(&server->newrq_mutex);
	if (!server->requests[i].buf || !server->requests[i].tries) {
	    pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
 
venaas committed
994
995
996
	    printf("clientrd: no matching request sent with this id, ignoring\n");
	    continue;
	}
997

998
999
	if (server->requests[i].received) {
	    pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
 
venaas committed
1000
1001
1002
	    printf("clientrd: already received, ignoring\n");
	    continue;
	}
1003
	
venaas's avatar
venaas committed
1004
	if (!validauth(buf, server->requests[i].buf + 4, server->peer.secret)) {
1005
	    pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
 
venaas committed
1006
1007
1008
	    printf("clientrd: invalid auth, ignoring\n");
	    continue;
	}
1009
1010
1011
	
	from = server->requests[i].from;

venaas's avatar
venaas committed
1012

1013
1014
1015
1016
1017
1018
1019
	/* messageauthattr present? */
	messageauthattr = NULL;
	left = RADLEN(buf) - 20;
	attr = buf + 20;
	while (left > 1) {
	    left -= attr[RAD_Attr_Length];
	    if (left < 0) {
venaas's avatar
venaas committed
1020
1021
		printf("clientrd: attribute length exceeds packet length, ignoring packet\n");
		goto getnext;
1022
1023
	    }
	    if (attr[RAD_Attr_Type] == RAD_Attr_Message_Authenticator) {
venaas's avatar
venaas committed
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
		if (attr[RAD_Attr_Length] != 18) {
		    printf("clientrd: illegal message auth attribute length, ignoring packet\n");
		    goto getnext;
		}
		memcpy(tmp, buf + 4, 16);
		memcpy(buf + 4, server->requests[i].buf + 4, 16);
		if (!checkmessageauth(buf, &attr[RAD_Attr_Value], server->peer.secret)) {
		    printf("clientrd: message authentication failed\n");
		    goto getnext;
		}
		memcpy(buf + 4, tmp, 16);
		printf("clientrd: message auth ok\n");
1036
1037
1038
1039
1040
		messageauthattr = attr;
		break;
	    }
	    attr += attr[RAD_Attr_Length];
	}
venaas's avatar
 
venaas committed
1041

venaas's avatar
venaas committed
1042
1043
1044
1045
1046
1047
1048
1049
	/* handle MS MPPE */
	left = RADLEN(buf) - 20;
	attr = buf + 20;
	while (left > 1) {
	    left -= attr[RAD_Attr_Length];
	    if (left < 0) {
		printf("clientrd: attribute length exceeds packet length, ignoring packet\n");
		goto getnext;
1050
	    }
venaas's avatar
venaas committed
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
	    if (attr[RAD_Attr_Type] == RAD_Attr_Vendor_Specific &&
		((uint16_t *)attr)[1] == 0 && ntohs(((uint16_t *)attr)[2]) == 311) { // 311 == MS
		subleft = attr[RAD_Attr_Length] - 6;
		subattr = attr + 6;
		while (subleft > 1) {
		    subleft -= subattr[RAD_Attr_Length];
		    if (subleft < 0)
			break;
		    if (subattr[RAD_Attr_Type] != RAD_VS_ATTR_MS_MPPE_Send_Key &&
			subattr[RAD_Attr_Type] != RAD_VS_ATTR_MS_MPPE_Recv_Key)
			continue;
		    printf("clientrd: Got MS MPPE\n");
		    if (subattr[RAD_Attr_Length] < 20)
			continue;

		    if (!msmppdecrypt(subattr + 4, subattr[RAD_Attr_Length] - 4,
			    server->peer.secret, strlen(server->peer.secret), server->requests[i].buf + 4, subattr + 2)) {
			printf("clientrd: failed to decrypt msppe key\n");
			continue;
		    }

		    if (!msmppencrypt(subattr + 4, subattr[RAD_Attr_Length] - 4,
			    from->peer.secret, strlen(from->peer.secret), server->requests[i].origauth, subattr + 2)) {
			printf("clientrd: failed to encrypt msppe key\n");
			continue;
		    }
		}
		if (subleft < 0) {
		    printf("clientrd: bad vendor specific attr or subattr length, ignoring packet\n");
		    goto getnext;
		}
	    }
	    attr += attr[RAD_Attr_Length];
1084
	}
venaas's avatar
venaas committed
1085

venaas's avatar
 
venaas committed
1086
	/* once we set received = 1, requests[i] may be reused */
1087
1088
	buf[1] = (char)server->requests[i].origid;
	memcpy(buf + 4, server->requests[i].origauth, 16);
venaas's avatar
venaas committed
1089
	printauth("origauth/buf+4", buf + 4);
1090
1091
1092
1093
1094
	if (messageauthattr) {
	    if (!createmessageauth(buf, &messageauthattr[RAD_Attr_Value], from->peer.secret))
		continue;
	    printf("clientrd: computed messageauthattr\n");
	}
venaas's avatar
venaas committed
1095

venaas's avatar
venaas committed
1096
	if (from->peer.type == 'U')
1097
1098
1099
	    fromsa = server->requests[i].fromsa;
	server->requests[i].received = 1;
	pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
 
venaas committed
1100

venaas's avatar
venaas committed
1101
	if (!radsign(buf, from->peer.secret)) {
venaas's avatar
 
venaas committed
1102
1103
1104
	    printf("clientrd: failed to sign message\n");
	    continue;
	}
venaas's avatar
venaas committed
1105
	printauth("signedorigauth/buf+4", buf + 4);		
venaas's avatar
 
venaas committed
1106
	printf("clientrd: giving packet back to where it came from\n");
venaas's avatar
venaas committed
1107
	sendreply(from, server, buf, from->peer.type == 'U' ? &fromsa : NULL);
venaas's avatar
 
venaas committed
1108
1109
1110
1111
    }
}

void *clientwr(void *arg) {
1112
    struct server *server = (struct server *)arg;
1113
    struct request *rq;
venaas's avatar
 
venaas committed
1114
1115
    pthread_t clientrdth;
    int i;
1116
1117
    struct timeval now;
    
venaas's avatar
venaas committed
1118
1119
    if (server->peer.type == 'U') {
	if ((server->sock = connecttoserver(server->peer.addrinfo)) < 0) {
1120
	    printf("clientwr: connecttoserver failed\n");
venaas's avatar
 
venaas committed
1121
1122
1123
	    exit(1);
	}
    } else
1124
	tlsconnect(server, NULL, "new client");
venaas's avatar
 
venaas committed
1125
    
1126
    if (pthread_create(&clientrdth, NULL, clientrd, (void *)server))
venaas's avatar
 
venaas committed
1127
1128
1129
	errx("clientwr: pthread_create failed");

    for (;;) {
1130
1131
	pthread_mutex_lock(&server->newrq_mutex);
	while (!server->newrq) {
venaas's avatar
 
venaas committed
1132
	    printf("clientwr: waiting for signal\n");
1133
	    pthread_cond_wait(&server->newrq_cond, &server->newrq_mutex);
venaas's avatar
 
venaas committed
1134
1135
	    printf("clientwr: got signal\n");
	}
1136
1137
	server->newrq = 0;
	pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
 
venaas committed
1138
1139
	       
	for (i = 0; i < MAX_REQUESTS; i++) {
1140
1141
	    pthread_mutex_lock(&server->newrq_mutex);
	    while (!server->requests[i].buf && i < MAX_REQUESTS)
venaas's avatar
 
venaas committed
1142
1143
		i++;
	    if (i == MAX_REQUESTS) {
1144
		pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
 
venaas committed
1145
1146
1147
		break;
	    }

1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
	    gettimeofday(&now, NULL);
	    rq = server->requests + i;

            if (rq->received) {
		printf("clientwr: removing received packet from queue\n");
                free(rq->buf);
                /* setting this to NULL means that it can be reused */
                rq->buf = NULL;
                pthread_mutex_unlock(&server->newrq_mutex);
                continue;
            }
            if (now.tv_sec > rq->expiry.tv_sec) {
		printf("clientwr: removing expired packet from queue\n");
                free(rq->buf);
venaas's avatar
 
venaas committed
1162
                /* setting this to NULL means that it can be reused */
1163
                rq->buf = NULL;
1164
                pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
 
venaas committed
1165
1166
                continue;
            }
1167
1168
1169
1170
1171

	    if (rq->tries)
		continue; // not re-sending (yet)
	    
	    rq->tries++;
1172
            pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
 
venaas committed
1173
            
1174
	    clientradput(server, server->requests[i].buf);
venaas's avatar
 
venaas committed
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
	}
    }
    /* 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;
1208
1209
    struct server *to;
    struct client *fr;
venaas's avatar
 
venaas committed
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
    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));
1224
	buf = radudpget(udp_server_sock, &fr, NULL, &rq.fromsa);
venaas's avatar
 
venaas committed
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
	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;
1237
    struct client *client = (struct client *)arg;
venaas's avatar
 
venaas committed
1238
1239
    struct replyq *replyq;
    
1240
    pthread_mutex_lock(&client->replycount_mutex);
venaas's avatar
 
venaas committed
1241
    for (;;) {
1242
	replyq = client->replyq;
venaas's avatar
 
venaas committed
1243
1244
1245
1246
1247
1248
	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);
venaas's avatar
venaas committed
1249
	cnt = SSL_write(client->peer.ssl, replyq->replies->buf, RADLEN(replyq->replies->buf));
venaas's avatar
 
venaas committed
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
	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;
1268
    struct server *to;
venaas's avatar
 
venaas committed
1269
    int s;
1270
    struct client *client = (struct client *)arg;
venaas's avatar
 
venaas committed
1271
1272
1273
    pthread_t tlsserverwrth;

    printf("tlsserverrd starting\n");
venaas's avatar
venaas committed
1274
    if (SSL_accept(client->peer.ssl) <= 0) {
venaas's avatar
 
venaas committed
1275
1276
1277
1278
1279
        while ((error = ERR_get_error()))
            err("tlsserverrd: SSL: %s", ERR_error_string(error, NULL));
        errx("accept failed, child exiting");
    }

1280
    if (pthread_create(&tlsserverwrth, NULL, tlsserverwr, (void *)client))
venaas's avatar
 
venaas committed
1281
1282
1283
	errx("pthread_create failed");
    
    for (;;) {
venaas's avatar
venaas committed
1284
	buf = radtlsget(client->peer.ssl);
venaas's avatar
 
venaas committed
1285
1286
	if (!buf) {
	    printf("tlsserverrd: connection lost\n");
venaas's avatar
venaas committed
1287
1288
1289
	    s = SSL_get_fd(client->peer.ssl);
	    SSL_free(client->peer.ssl);
	    client->peer.ssl = NULL;
venaas's avatar
 
venaas committed
1290
1291
1292
1293
	    if (s >= 0)
		close(s);
	    pthread_exit(NULL);
	}
venaas's avatar
venaas committed
1294
	printf("tlsserverrd: got Radius message from %s\n", client->peer.host);
venaas's avatar
 
venaas committed
1295
	memset(&rq, 0, sizeof(struct request));
1296
	to = radsrv(&rq, buf, client);
venaas's avatar
 
venaas committed
1297
1298
1299
1300
	if (!to) {
	    printf("ignoring request, no place to send it\n");
	    continue;
	}
1301
	sendrq(to, client, &rq);
venaas's avatar
 
venaas committed
1302
1303
1304
1305
1306
1307
1308
1309
    }
}

int tlslistener(SSL_CTX *ssl_ctx) {
    pthread_t tlsserverth;
    int s, snew;
    struct sockaddr_storage from;
    size_t fromlen = sizeof(from);
1310
    struct client *client;
venaas's avatar
 
venaas committed
1311
1312
1313
1314
1315

    if ((s = bindport(SOCK_STREAM, DEFAULT_TLS_PORT)) < 0) {
        printf("tlslistener: socket/bind failed\n");
	exit(1);
    }
venaas's avatar
venaas committed
1316
    
venaas's avatar
 
venaas committed
1317
1318
1319
1320
1321
1322
1323
1324
1325
    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));

1326
1327
1328
	client = find_client('T', (struct sockaddr *)&from, NULL);
	if (!client) {
	    printf("ignoring request, not a known TLS client\n");
venaas's avatar
 
venaas committed
1329
1330
1331
1332
	    close(snew);
	    continue;
	}

venaas's avatar
venaas committed
1333
	if (client->peer.ssl) {
1334
	    printf("Ignoring incoming connection, already have one from this client\n");
venaas's avatar
 
venaas committed
1335
1336
1337
	    close(snew);
	    continue;
	}
venaas's avatar
venaas committed
1338
1339
	client->peer.ssl = SSL_new(ssl_ctx);
	SSL_set_fd(client->peer.ssl, snew);
1340
	if (pthread_create(&tlsserverth, NULL, tlsserverrd, (void *)client))
venaas's avatar
 
venaas committed
1341
1342
1343
1344
1345
	    errx("pthread_create failed");
    }
    return 0;
}

venaas's avatar
venaas committed
1346
char *parsehostport(char *s, struct peer *peer) {
venaas's avatar
 
venaas committed
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
    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);
    }
venaas's avatar
venaas committed
1369
1370
    peer->host = malloc(p - field + 1);
    if (!peer->host)
venaas's avatar
 
venaas committed
1371
	errx("malloc failed");
venaas's avatar
venaas committed
1372
1373
    memcpy(peer->host, field, p - field);
    peer->host[p - field] = '\0';
venaas's avatar
 
venaas committed
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
    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);
	    }
venaas's avatar
venaas committed
1389
1390
	    peer->port = malloc(p - field + 1);
	    if (!peer->port)
venaas's avatar
 
venaas committed
1391
		errx("malloc failed");
venaas's avatar
venaas committed
1392
1393
	    memcpy(peer->port, field, p - field);
	    peer->port[p - field] = '\0';
venaas's avatar
 
venaas committed
1394
    } else
venaas's avatar
venaas committed
1395
        peer->port = NULL;
venaas's avatar
   
venaas committed
1396
1397
1398
1399
    return p;
}

// * is default, else longest match ... ";" used for separator
1400
char *parserealmlist(char *s, struct server *server) {
venaas's avatar
   
venaas committed
1401
1402
1403
1404
1405
1406
1407
1408
    char *p;
    int i, n, l;

    for (p = s, n = 1; *p && *p != ' ' && *p != '\t' && *p != '\n'; p++)
	if (*p == ';')
	    n++;
    l = p - s;
    if (!l) {
1409
	server->realms = NULL;
venaas's avatar
   
venaas committed
1410
1411
	return p;
    }
1412
1413
    server->realmdata = malloc(l + 1);
    if (!server->realmdata)
venaas's avatar
   
venaas committed
1414
	errx("malloc failed");
1415
1416
1417
1418
    memcpy(server->realmdata, s, l);
    server->realmdata[l] = '\0';
    server->realms = malloc((1+n) * sizeof(char *));
    if (!server->realms)
venaas's avatar
   
venaas committed
1419
	errx("malloc failed");
1420
    server->realms[0] = server->realmdata;
venaas's avatar
   
venaas committed
1421
    for (n = 1, i = 0; i < l; i++)
1422
1423
1424
	if (server->realmdata[i] == ';') {
	    server->realmdata[i] = '\0';
	    server->realms[n++] = server->realmdata + i + 1;
venaas's avatar
   
venaas committed
1425
	}	
1426
    server->realms[n] = NULL;
venaas's avatar
 
venaas committed
1427
1428
1429
    return p;
}

1430
1431
/* exactly one argument must be non-NULL */
void getconfig(const char *serverfile, const char *clientfile) {
venaas's avatar
 
venaas committed
1432
1433
    FILE *f;
    char line[1024];
venaas's avatar
   
venaas committed
1434
    char *p, *field, **r;
1435
1436
    struct client *client;
    struct server *server;