radsecproxy.c 45.7 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
15
 * make our server ignore client retrans and do its own instead?
 * tls keep alives (server status)
venaas's avatar
 
venaas committed
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
 * 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>
venaas's avatar
venaas committed
44
#include <sys/time.h>
venaas's avatar
 
venaas committed
45
46
47
48
49
#include <pthread.h>
#include <openssl/ssl.h>
#include <openssl/rand.h>
#include <openssl/err.h>
#include <openssl/md5.h>
venaas's avatar
venaas committed
50
#include <openssl/hmac.h>
venaas's avatar
 
venaas committed
51
52
#include "radsecproxy.h"

53
54
55
56
57
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
58
59
60
61
62
63
64
65
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

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
95
96
97
98
99
100
101
102
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
103
104
int resolvepeer(struct peer *peer) {
    struct addrinfo hints, *addrinfo;
venaas's avatar
 
venaas committed
105
106
    
    memset(&hints, 0, sizeof(hints));
venaas's avatar
venaas committed
107
    hints.ai_socktype = (peer->type == 'T' ? SOCK_STREAM : SOCK_DGRAM);
venaas's avatar
 
venaas committed
108
    hints.ai_family = AF_UNSPEC;
venaas's avatar
venaas committed
109
110
    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
111
112
	return 0;
    }
113

venaas's avatar
venaas committed
114
115
116
    if (peer->addrinfo)
	freeaddrinfo(peer->addrinfo);
    peer->addrinfo = addrinfo;
venaas's avatar
 
venaas committed
117
118
119
    return 1;
}	  

120
int connecttoserver(struct addrinfo *addrinfo) {
venaas's avatar
 
venaas committed
121
122
123
    int s;
    struct addrinfo *res;
    
124
    for (res = addrinfo; res; res = res->ai_next) {
venaas's avatar
 
venaas committed
125
126
        s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
        if (s < 0) {
127
            err("connecttoserver: socket failed");
venaas's avatar
 
venaas committed
128
129
130
131
            continue;
        }
        if (connect(s, res->ai_addr, res->ai_addrlen) == 0)
            break;
132
        err("connecttoserver: connect failed");
venaas's avatar
 
venaas committed
133
134
135
136
137
138
        close(s);
        s = -1;
    }
    return s;
}	  

139
140
141
/* 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
142
143
    struct sockaddr_in6 *sa6;
    struct in_addr *a4 = NULL;
144
    struct client *c;
venaas's avatar
 
venaas committed
145
146
147
148
149
150
151
152
153
154
    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;

155
156
    c = (client ? client : clients);
    for (i = 0; i < client_count; i++) {
venaas's avatar
venaas committed
157
158
	if (c->peer.type == type)
	    for (res = c->peer.addrinfo; res; res = res->ai_next)
venaas's avatar
 
venaas committed
159
160
161
162
		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)))
163
164
		    return c;
	if (client)
venaas's avatar
 
venaas committed
165
	    break;
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
	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
189
190
	if (s->peer.type == type)
	    for (res = s->peer.addrinfo; res; res = res->ai_next)
191
192
193
194
195
196
197
198
		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
199
200
201
202
    }
    return NULL;
}

203
/* exactly one of client and server must be non-NULL */
venaas's avatar
 
venaas committed
204
205
/* if *peer == NULL we return who we received from, else require it to be from peer */
/* return from in sa if not NULL */
206
unsigned char *radudpget(int s, struct client **client, struct server **server, struct sockaddr_storage *sa) {
venaas's avatar
 
venaas committed
207
    int cnt, len;
208
    void *f;
venaas's avatar
 
venaas committed
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
    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);

235
236
237
	f = (client
	     ? (void *)find_client('U', (struct sockaddr *)&from, *client)
	     : (void *)find_server('U', (struct sockaddr *)&from, *server));
venaas's avatar
 
venaas committed
238
239
240
241
242
243
244
245
246
247
248
	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);
249
250
251
252
    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
253
254
255
256
257
    if (sa)
	*sa = from;
    return rad;
}

258
void tlsconnect(struct server *server, struct timeval *when, char *text) {
venaas's avatar
venaas committed
259
260
261
    struct timeval now;
    time_t elapsed;
    unsigned long error;
venaas's avatar
venaas committed
262

venaas's avatar
venaas committed
263
    printf("tlsconnect called from %s\n", text);
264
265
    pthread_mutex_lock(&server->lock);
    if (when && memcmp(&server->lastconnecttry, when, sizeof(struct timeval))) {
venaas's avatar
 
venaas committed
266
	/* already reconnected, nothing to do */
venaas's avatar
venaas committed
267
	printf("tlsconnect(%s): seems already reconnected\n", text);
268
	pthread_mutex_unlock(&server->lock);
venaas's avatar
 
venaas committed
269
270
271
	return;
    }

venaas's avatar
venaas committed
272
273
    printf("tlsconnect %s\n", text);

venaas's avatar
 
venaas committed
274
    for (;;) {
venaas's avatar
venaas committed
275
	gettimeofday(&now, NULL);
276
277
278
	elapsed = now.tv_sec - server->lastconnecttry.tv_sec;
	if (server->connectionok) {
	    server->connectionok = 0;
venaas's avatar
venaas committed
279
280
281
282
283
284
	    sleep(10);
	} else if (elapsed < 5)
	    sleep(10);
	else if (elapsed < 600)
	    sleep(elapsed * 2);
	else if (elapsed < 10000) /* no sleep at startup */
venaas's avatar
venaas committed
285
		sleep(900);
venaas's avatar
venaas committed
286
	printf("tlsconnect: trying to open TLS connection to %s port %s\n", server->peer.host, server->peer.port);
287
288
	if (server->sock >= 0)
	    close(server->sock);
venaas's avatar
venaas committed
289
	if ((server->sock = connecttoserver(server->peer.addrinfo)) < 0)
venaas's avatar
venaas committed
290
	    continue;
venaas's avatar
venaas committed
291
292
293
294
	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
295
	    break;
venaas's avatar
venaas committed
296
297
	while ((error = ERR_get_error()))
	    err("tlsconnect: TLS: %s", ERR_error_string(error, NULL));
venaas's avatar
 
venaas committed
298
    }
venaas's avatar
venaas committed
299
    printf("tlsconnect: TLS connection to %s port %s up\n", server->peer.host, server->peer.port);
venaas's avatar
venaas committed
300
    gettimeofday(&server->lastconnecttry, NULL);
301
    pthread_mutex_unlock(&server->lock);
venaas's avatar
 
venaas committed
302
303
304
305
306
307
308
309
310
311
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
}

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;
}

345
int clientradput(struct server *server, unsigned char *rad) {
venaas's avatar
venaas committed
346
    int cnt;
venaas's avatar
 
venaas committed
347
348
    size_t len;
    unsigned long error;
venaas's avatar
venaas committed
349
350
    struct timeval lastconnecttry;
    
venaas's avatar
 
venaas committed
351
    len = RADLEN(rad);
venaas's avatar
venaas committed
352
    if (server->peer.type == 'U') {
353
	if (send(server->sock, rad, len, 0) >= 0) {
venaas's avatar
venaas committed
354
	    printf("clienradput: sent UDP of length %d to %s port %s\n", len, server->peer.host, server->peer.port);
venaas's avatar
 
venaas committed
355
356
357
358
359
360
	    return 1;
	}
	err("clientradput: send failed");
	return 0;
    }

361
    lastconnecttry = server->lastconnecttry;
venaas's avatar
venaas committed
362
    while ((cnt = SSL_write(server->peer.ssl, rad, len)) <= 0) {
venaas's avatar
 
venaas committed
363
364
	while ((error = ERR_get_error()))
	    err("clientwr: TLS: %s", ERR_error_string(error, NULL));
365
366
	tlsconnect(server, &lastconnecttry, "clientradput");
	lastconnecttry = server->lastconnecttry;
venaas's avatar
 
venaas committed
367
    }
venaas's avatar
venaas committed
368

369
    server->connectionok = 1;
venaas's avatar
 
venaas committed
370
    printf("clientradput: Sent %d bytes, Radius packet of length %d to TLS peer %s\n",
venaas's avatar
venaas committed
371
	   cnt, len, server->peer.host);
venaas's avatar
 
venaas committed
372
373
374
375
376
377
378
379
380
381
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
    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;
}
	      
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
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
444
    memcpy(authattr, auth, 16);
445
446
447
448
449
450
451
452
453
454
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
    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;
}

491
void sendrq(struct server *to, struct client *from, struct request *rq) {
venaas's avatar
 
venaas committed
492
    int i;
493
    
venaas's avatar
 
venaas committed
494
    pthread_mutex_lock(&to->newrq_mutex);
venaas's avatar
venaas committed
495
496

    /* should search from where inserted last */
venaas's avatar
 
venaas committed
497
498
499
500
501
502
503
504
505
    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;
venaas's avatar
venaas committed
506
    
507
508
    if (!createmessageauth(rq->buf, rq->messageauthattrval, to->peer.secret))
	return;
venaas's avatar
venaas committed
509

510
511
    gettimeofday(&rq->expiry, NULL);
    rq->expiry.tv_sec += 30;
venaas's avatar
 
venaas committed
512
513
514
515
516
517
518
519
520
521
    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);
}

522
void sendreply(struct client *to, struct server *from, char *buf, struct sockaddr_storage *tosa) {
venaas's avatar
 
venaas committed
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
    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
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
int pwdencrypt(uint8_t *out, uint8_t *in, uint8_t len, 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++)
	    out[offset + i] = hash[i] ^ in[offset + i];
	input = out + offset - 16;
	offset += 16;
	if (offset == len)
	    break;
    }
    pthread_mutex_unlock(&lock);
    return 1;
}

int pwddecrypt(uint8_t *out, uint8_t *in, uint8_t len, uint8_t *shared, uint8_t sharedlen,
venaas's avatar
 
venaas committed
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
		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++)
venaas's avatar
venaas committed
606
607
	    out[offset + i] = hash[i] ^ in[offset + i];
	input = in + offset;
venaas's avatar
 
venaas committed
608
	offset += 16;
venaas's avatar
venaas committed
609
	if (offset == len)
venaas's avatar
 
venaas committed
610
611
612
613
614
615
	    break;
    }
    pthread_mutex_unlock(&lock);
    return 1;
}

venaas's avatar
venaas committed
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
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
684
685
686
687
688
689
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
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) {
	printf("text + offset - 16 c(%d): ", offset / 16);
	for (i = 0; i < 16; i++)
	    printf("%02x ", (text + offset - 16)[i]);
	printf("\n");

	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;
}

791
struct server *id2server(char *id, uint8_t len) {
venaas's avatar
venaas committed
792
    int i;
venaas's avatar
venaas committed
793
    char **realm, *idrealm;
venaas's avatar
venaas committed
794

venaas's avatar
venaas committed
795
    idrealm = strchr(id, '@');
venaas's avatar
venaas committed
796
    if (idrealm) {
venaas's avatar
venaas committed
797
	idrealm++;
venaas's avatar
venaas committed
798
799
800
801
802
	len -= idrealm - id;
    } else {
	idrealm = "-";
	len = 1;
    }
803
804
    for (i = 0; i < server_count; i++) {
	for (realm = servers[i].realms; *realm; realm++) {
venaas's avatar
venaas committed
805
806
	    if ((strlen(*realm) == 1 && **realm == '*') ||
		(strlen(*realm) == len && !memcmp(idrealm, *realm, len))) {
venaas's avatar
venaas committed
807
		printf("found matching realm: %s, host %s\n", *realm, servers[i].peer.host);
808
		return servers + i;
venaas's avatar
venaas committed
809
810
811
812
813
814
	    }
	}
    }
    return NULL;
}

815
struct server *radsrv(struct request *rq, char *buf, struct client *from) {
venaas's avatar
   
venaas committed
816
817
    uint8_t code, id, *auth, *attr, pwd[128], attrvallen;
    uint8_t *usernameattr = NULL, *userpwdattr = NULL, *tunnelpwdattr = NULL, *messageauthattr = NULL;
venaas's avatar
 
venaas committed
818
819
820
    int i;
    uint16_t len;
    int left;
821
    struct server *to;
venaas's avatar
 
venaas committed
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
    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
852
853
854
855
856
857
	case RAD_Attr_Tunnel_Password:
	    tunnelpwdattr = attr;
	    break;
	case RAD_Attr_Message_Authenticator:
	    messageauthattr = attr;
	    break;
venaas's avatar
 
venaas committed
858
859
860
861
862
863
864
865
	}
	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
866
	for (i = 0; i < usernameattr[RAD_Attr_Length] - 2; i++)
venaas's avatar
 
venaas committed
867
868
869
870
	    printf("%c", usernameattr[RAD_Attr_Value + i]);
	printf("\n");
    }

871
    to = id2server(&usernameattr[RAD_Attr_Value], usernameattr[RAD_Attr_Length] - 2);
venaas's avatar
venaas committed
872
873
874
    if (!to) {
	printf("radsrv: ignoring request, don't know where to send it\n");
	return NULL;
venaas's avatar
venaas committed
875
    }
venaas's avatar
venaas committed
876
    
venaas's avatar
   
venaas committed
877
    if (messageauthattr && (messageauthattr[RAD_Attr_Length] != 18 ||
878
			    !checkmessageauth(buf, &messageauthattr[RAD_Attr_Value], from->peer.secret))) {
venaas's avatar
   
venaas committed
879
880
881
882
	printf("radsrv: message authentication failed\n");
	return NULL;
    }

venaas's avatar
venaas committed
883
884
885
886
887
888
889
890
    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
891
892
    if (userpwdattr) {
	printf("radsrv: found userpwdattr of length %d\n", userpwdattr[RAD_Attr_Length]);
venaas's avatar
   
venaas committed
893
894
895
896
897
898
	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
899
	if (!pwddecrypt(pwd, &userpwdattr[RAD_Attr_Value], attrvallen, from->peer.secret, strlen(from->peer.secret), auth)) {
venaas's avatar
   
venaas committed
900
901
902
903
904
905
906
	    printf("radsrv: cannot decrypt password\n");
	    return NULL;
	}
	printf("radsrv: password: ");
	for (i = 0; i < attrvallen; i++)
	    printf("%02x ", pwd[i]);
	printf("\n");
venaas's avatar
venaas committed
907
	if (!pwdencrypt(&userpwdattr[RAD_Attr_Value], pwd, attrvallen, to->peer.secret, strlen(to->peer.secret), newauth)) {
venaas's avatar
   
venaas committed
908
909
910
911
912
913
914
915
916
	    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
917
918
919
920
	    printf("radsrv: invalid user password length\n");
	    return NULL;
	}
	
venaas's avatar
venaas committed
921
	if (!pwddecrypt(pwd, &tunnelpwdattr[RAD_Attr_Value], attrvallen, from->peer.secret, strlen(from->peer.secret), auth)) {
venaas's avatar
 
venaas committed
922
923
924
925
	    printf("radsrv: cannot decrypt password\n");
	    return NULL;
	}
	printf("radsrv: password: ");
venaas's avatar
   
venaas committed
926
	for (i = 0; i < attrvallen; i++)
venaas's avatar
 
venaas committed
927
928
	    printf("%02x ", pwd[i]);
	printf("\n");
venaas's avatar
venaas committed
929
	if (!pwdencrypt(&tunnelpwdattr[RAD_Attr_Value], pwd, attrvallen, to->peer.secret, strlen(to->peer.secret), newauth)) {
venaas's avatar
 
venaas committed
930
931
932
933
934
935
936
937
	    printf("radsrv: cannot encrypt password\n");
	    return NULL;
	}
    }

    rq->buf = buf;
    rq->from = from;
    rq->origid = id;
938
    rq->messageauthattrval = (messageauthattr ? &messageauthattr[RAD_Attr_Value] : NULL);
venaas's avatar
 
venaas committed
939
    memcpy(rq->origauth, auth, 16);
venaas's avatar
venaas committed
940
941
942
    memcpy(auth, newauth, 16);
    printauth("rq->origauth", rq->origauth);
    printauth("auth", auth);
venaas's avatar
 
venaas committed
943
944
945
946
    return to;
}

void *clientrd(void *arg) {
947
948
    struct server *server = (struct server *)arg;
    struct client *from;
venaas's avatar
venaas committed
949
950
    int i, left, subleft;
    unsigned char *buf, *messageauthattr, *subattr, *attr;
venaas's avatar
 
venaas committed
951
    struct sockaddr_storage fromsa;
venaas's avatar
venaas committed
952
    struct timeval lastconnecttry;
venaas's avatar
venaas committed
953
    char tmp[255];
venaas's avatar
 
venaas committed
954
955
    
    for (;;) {
venaas's avatar
venaas committed
956
    getnext:
957
	lastconnecttry = server->lastconnecttry;
venaas's avatar
venaas committed
958
959
	buf = (server->peer.type == 'U' ? radudpget(server->sock, NULL, &server, NULL) : radtlsget(server->peer.ssl));
	if (!buf && server->peer.type == 'T') {
960
	    tlsconnect(server, &lastconnecttry, "clientrd");
venaas's avatar
 
venaas committed
961
962
	    continue;
	}
963
964
    
	server->connectionok = 1;
965
966
967
968
969

	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
970
971
972
	
	i = buf[1]; /* i is the id */

973
974
975
	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
976
977
978
	    printf("clientrd: no matching request sent with this id, ignoring\n");
	    continue;
	}
979

980
981
	if (server->requests[i].received) {
	    pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
 
venaas committed
982
983
984
	    printf("clientrd: already received, ignoring\n");
	    continue;
	}
985
	
venaas's avatar
venaas committed
986
	if (!validauth(buf, server->requests[i].buf + 4, server->peer.secret)) {
987
	    pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
 
venaas committed
988
989
990
	    printf("clientrd: invalid auth, ignoring\n");
	    continue;
	}
991
992
993
	
	from = server->requests[i].from;

venaas's avatar
venaas committed
994

995
996
997
998
999
1000
	/* messageauthattr present? */
	messageauthattr = NULL;
	left = RADLEN(buf) - 20;
	attr = buf + 20;
	while (left > 1) {
	    left -= attr[RAD_Attr_Length];