radsecproxy.c 52.1 KB
Newer Older
venaas's avatar
   
venaas committed
1
2
3
4
5
6
7
8
9
/*
 * 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.
 */

/* TODO:
venaas's avatar
venaas committed
10
11
12
 * accounting
 * radius keep alives (server status)
 * setsockopt(keepalive...), check if openssl has some keepalive feature
venaas's avatar
   
venaas committed
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
*/

/* 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
40
#include <sys/time.h>
venaas's avatar
   
venaas committed
41
42
43
44
45
#include <pthread.h>
#include <openssl/ssl.h>
#include <openssl/rand.h>
#include <openssl/err.h>
#include <openssl/md5.h>
venaas's avatar
venaas committed
46
#include <openssl/hmac.h>
venaas's avatar
   
venaas committed
47
48
#include "radsecproxy.h"

49
static struct options options;
50
51
static struct client *clients;
static struct server *servers;
52

53
54
static int client_udp_count = 0;
static int client_tls_count = 0;
55
static int client_count = 0;
56
57
static int server_udp_count = 0;
static int server_tls_count = 0;
58
static int server_count = 0;
venaas's avatar
   
venaas committed
59
60
61
62
63

static struct replyq udp_server_replyq;
static int udp_server_sock = -1;
static pthread_mutex_t *ssl_locks;
static long *ssl_lock_count;
64
static SSL_CTX *ssl_ctx = NULL;
venaas's avatar
   
venaas committed
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
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]);
}

81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
static int verify_cb(int ok, X509_STORE_CTX *ctx) {
  char buf[256];
  X509 *err_cert;
  int err, depth;

  err_cert = X509_STORE_CTX_get_current_cert(ctx);
  err = X509_STORE_CTX_get_error(ctx);
  depth = X509_STORE_CTX_get_error_depth(ctx);

  if (depth > MAX_CERT_DEPTH) {
      ok = 0;
      err = X509_V_ERR_CERT_CHAIN_TOO_LONG;
      X509_STORE_CTX_set_error(ctx, err);
  }

  if (!ok) {
      X509_NAME_oneline(X509_get_subject_name(err_cert), buf, 256);
      printf("verify error: num=%d:%s:depth=%d:%s\n", err, X509_verify_cert_error_string(err), depth, buf);

      switch (err) {
      case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
	  X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), buf, 256);
	  printf("issuer=%s\n", buf);
	  break;
      case X509_V_ERR_CERT_NOT_YET_VALID:
      case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
	  printf("Certificate not yet valid\n");
	  break;
      case X509_V_ERR_CERT_HAS_EXPIRED:
	  printf("Certificate has expired\n");
	  break;
      case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
	  printf("Certificate no longer valid (after notAfter)\n");
	  break;
      }
  }
venaas's avatar
venaas committed
117
  //  printf("certificate verify returns %d\n", ok);
118
119
120
  return ok;
}

121
122
SSL_CTX *ssl_init() {
    SSL_CTX *ctx;
venaas's avatar
   
venaas committed
123
    int i;
124
125
126
127
128
129
    unsigned long error;
    
    if (!options.tlscertificatefile || !options.tlscertificatekeyfile) {
	printf("TLSCertificateFile and TLSCertificateKeyFile must be specified for TLS\n");
	exit(1);
    }
venaas's avatar
venaas committed
130
131
132
133
    if (!options.tlscacertificatefile && !options.tlscacertificatepath) {
	printf("CA Certificate file/path need to be configured\n");
	exit(1);
    }
venaas's avatar
   
venaas committed
134
135
136
137
138
139
140
141
142

    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);
143
144
145
146
147
148
149
150
151
152
153

    SSL_load_error_strings();
    SSL_library_init();

    while (!RAND_status()) {
	time_t t = time(NULL);
	pid_t pid = getpid();
	RAND_seed((unsigned char *)&t, sizeof(time_t));
        RAND_seed((unsigned char *)&pid, sizeof(pid));
    }

154
    ctx = SSL_CTX_new(TLSv1_method());
venaas's avatar
venaas committed
155
156
157
158
159
160
161
162
163
    if (SSL_CTX_use_certificate_chain_file(ctx, options.tlscertificatefile) &&
	SSL_CTX_use_PrivateKey_file(ctx, options.tlscertificatekeyfile, SSL_FILETYPE_PEM) &&
	SSL_CTX_check_private_key(ctx) &&
	SSL_CTX_load_verify_locations(ctx, options.tlscacertificatefile, options.tlscacertificatepath)) {
	SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, verify_cb);
	SSL_CTX_set_verify_depth(ctx, MAX_CERT_DEPTH + 1);
	return ctx;
    }

164
165
166
    while ((error = ERR_get_error()))
	err("SSL: %s", ERR_error_string(error, NULL));
    exit(1);
167
}    
venaas's avatar
   
venaas committed
168

venaas's avatar
venaas committed
169
170
171
172
173
174
175
176
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
177
178
int resolvepeer(struct peer *peer) {
    struct addrinfo hints, *addrinfo;
venaas's avatar
   
venaas committed
179
180
    
    memset(&hints, 0, sizeof(hints));
venaas's avatar
venaas committed
181
    hints.ai_socktype = (peer->type == 'T' ? SOCK_STREAM : SOCK_DGRAM);
venaas's avatar
   
venaas committed
182
    hints.ai_family = AF_UNSPEC;
venaas's avatar
venaas committed
183
184
    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
185
186
	return 0;
    }
187

venaas's avatar
venaas committed
188
189
190
    if (peer->addrinfo)
	freeaddrinfo(peer->addrinfo);
    peer->addrinfo = addrinfo;
venaas's avatar
   
venaas committed
191
192
193
    return 1;
}	  

194
int connecttoserver(struct addrinfo *addrinfo) {
venaas's avatar
   
venaas committed
195
196
197
    int s;
    struct addrinfo *res;
    
198
    for (res = addrinfo; res; res = res->ai_next) {
venaas's avatar
   
venaas committed
199
200
        s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
        if (s < 0) {
201
            err("connecttoserver: socket failed");
venaas's avatar
   
venaas committed
202
203
204
205
            continue;
        }
        if (connect(s, res->ai_addr, res->ai_addrlen) == 0)
            break;
206
        err("connecttoserver: connect failed");
venaas's avatar
   
venaas committed
207
208
209
210
211
212
        close(s);
        s = -1;
    }
    return s;
}	  

213
214
215
/* 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
216
217
    struct sockaddr_in6 *sa6;
    struct in_addr *a4 = NULL;
218
    struct client *c;
venaas's avatar
   
venaas committed
219
220
221
222
223
224
225
226
227
228
    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;

229
230
    c = (client ? client : clients);
    for (i = 0; i < client_count; i++) {
venaas's avatar
venaas committed
231
232
	if (c->peer.type == type)
	    for (res = c->peer.addrinfo; res; res = res->ai_next)
venaas's avatar
   
venaas committed
233
234
235
236
		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)))
237
238
		    return c;
	if (client)
venaas's avatar
   
venaas committed
239
	    break;
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
	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
263
264
	if (s->peer.type == type)
	    for (res = s->peer.addrinfo; res; res = res->ai_next)
265
266
267
268
269
270
271
272
		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
273
274
275
276
    }
    return NULL;
}

277
/* exactly one of client and server must be non-NULL */
venaas's avatar
   
venaas committed
278
279
/* if *peer == NULL we return who we received from, else require it to be from peer */
/* return from in sa if not NULL */
280
unsigned char *radudpget(int s, struct client **client, struct server **server, struct sockaddr_storage *sa) {
venaas's avatar
   
venaas committed
281
    int cnt, len;
282
    void *f;
venaas's avatar
   
venaas committed
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
    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);

309
310
311
	f = (client
	     ? (void *)find_client('U', (struct sockaddr *)&from, *client)
	     : (void *)find_server('U', (struct sockaddr *)&from, *server));
venaas's avatar
   
venaas committed
312
313
314
315
316
317
318
319
320
321
322
	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);
323
324
325
326
    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
327
328
329
330
331
    if (sa)
	*sa = from;
    return rad;
}

332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
int tlsverifycert(struct peer *peer) {
    int i, l, loc;
    X509 *cert;
    X509_NAME *nm;
    X509_NAME_ENTRY *e;
    unsigned char *v;
    unsigned long error;

#if 1
    if (SSL_get_verify_result(peer->ssl) != X509_V_OK) {
	printf("tlsverifycert: basic validation failed\n");
	while ((error = ERR_get_error()))
	    err("clientwr: TLS: %s", ERR_error_string(error, NULL));
	return 0;
    }
#endif    
    cert = SSL_get_peer_certificate(peer->ssl);
    if (!cert) {
	printf("tlsverifycert: failed to obtain certificate\n");
	return 0;
    }
    nm = X509_get_subject_name(cert);
    loc = -1;
    for (;;) {
	loc = X509_NAME_get_index_by_NID(nm, NID_commonName, loc);
	if (loc == -1)
	    break;
	e = X509_NAME_get_entry(nm, loc);
	l = ASN1_STRING_to_UTF8(&v, X509_NAME_ENTRY_get_data(e));
	if (l < 0)
	    continue;
	printf("cn: ");
	for (i = 0; i < l; i++)
	    printf("%c", v[i]);
	printf("\n");
	if (l == strlen(peer->host) && !strncasecmp(peer->host, v, l)) {
	    printf("tlsverifycert: Found cn matching host %s, All OK\n", peer->host);
	    return 1;
	}
	printf("tlsverifycert: cn not matching host %s\n", peer->host);
    }
    X509_free(cert);
    return 0;
}

377
void tlsconnect(struct server *server, struct timeval *when, char *text) {
venaas's avatar
venaas committed
378
379
    struct timeval now;
    time_t elapsed;
venaas's avatar
venaas committed
380

venaas's avatar
venaas committed
381
    printf("tlsconnect called from %s\n", text);
382
383
    pthread_mutex_lock(&server->lock);
    if (when && memcmp(&server->lastconnecttry, when, sizeof(struct timeval))) {
venaas's avatar
   
venaas committed
384
	/* already reconnected, nothing to do */
venaas's avatar
venaas committed
385
	printf("tlsconnect(%s): seems already reconnected\n", text);
386
	pthread_mutex_unlock(&server->lock);
venaas's avatar
   
venaas committed
387
388
389
	return;
    }

venaas's avatar
venaas committed
390
391
    printf("tlsconnect %s\n", text);

venaas's avatar
   
venaas committed
392
    for (;;) {
venaas's avatar
venaas committed
393
	gettimeofday(&now, NULL);
394
395
396
	elapsed = now.tv_sec - server->lastconnecttry.tv_sec;
	if (server->connectionok) {
	    server->connectionok = 0;
venaas's avatar
venaas committed
397
398
399
	    sleep(10);
	} else if (elapsed < 5)
	    sleep(10);
venaas's avatar
venaas committed
400
401
402
403
404
405
406
	else if (elapsed < 600) {
	    printf("tlsconnect: sleeping %lds\n", elapsed);
	    sleep(elapsed);
	} else if (elapsed < 1000) {
	    printf("tlsconnect: sleeping %ds\n", 900);
	    sleep(900);
	} else
venaas's avatar
venaas committed
407
	    server->lastconnecttry.tv_sec = now.tv_sec;  // no sleep at startup
venaas's avatar
venaas committed
408
	printf("tlsconnect: trying to open TLS connection to %s port %s\n", server->peer.host, server->peer.port);
409
410
	if (server->sock >= 0)
	    close(server->sock);
venaas's avatar
venaas committed
411
	if ((server->sock = connecttoserver(server->peer.addrinfo)) < 0)
venaas's avatar
venaas committed
412
	    continue;
venaas's avatar
venaas committed
413
	SSL_free(server->peer.ssl);
414
	server->peer.ssl = SSL_new(ssl_ctx);
venaas's avatar
venaas committed
415
	SSL_set_fd(server->peer.ssl, server->sock);
416
	if (SSL_connect(server->peer.ssl) > 0 && tlsverifycert(&server->peer))
venaas's avatar
   
venaas committed
417
418
	    break;
    }
venaas's avatar
venaas committed
419
    printf("tlsconnect: TLS connection to %s port %s up\n", server->peer.host, server->peer.port);
venaas's avatar
venaas committed
420
    gettimeofday(&server->lastconnecttry, NULL);
421
    pthread_mutex_unlock(&server->lock);
venaas's avatar
   
venaas committed
422
423
424
425
426
427
428
429
430
431
432
}

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");
433
434
435
436
		if (SSL_get_error(ssl, cnt) == SSL_ERROR_ZERO_RETURN) {
		    //remote end sent close_notify, send one back
		    SSL_shutdown(ssl);
		}
venaas's avatar
   
venaas committed
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
		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");
453
454
455
456
		if (SSL_get_error(ssl, cnt) == SSL_ERROR_ZERO_RETURN) {
		    //remote end sent close_notify, send one back
		    SSL_shutdown(ssl);
		}
venaas's avatar
   
venaas committed
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
		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;
}

473
int clientradput(struct server *server, unsigned char *rad) {
venaas's avatar
venaas committed
474
    int cnt;
venaas's avatar
   
venaas committed
475
476
    size_t len;
    unsigned long error;
venaas's avatar
venaas committed
477
478
    struct timeval lastconnecttry;
    
venaas's avatar
   
venaas committed
479
    len = RADLEN(rad);
venaas's avatar
venaas committed
480
    if (server->peer.type == 'U') {
481
	if (send(server->sock, rad, len, 0) >= 0) {
venaas's avatar
venaas committed
482
	    printf("clienradput: sent UDP of length %d to %s port %s\n", len, server->peer.host, server->peer.port);
venaas's avatar
   
venaas committed
483
484
485
486
487
488
	    return 1;
	}
	err("clientradput: send failed");
	return 0;
    }

489
    lastconnecttry = server->lastconnecttry;
venaas's avatar
venaas committed
490
    while ((cnt = SSL_write(server->peer.ssl, rad, len)) <= 0) {
venaas's avatar
   
venaas committed
491
492
	while ((error = ERR_get_error()))
	    err("clientwr: TLS: %s", ERR_error_string(error, NULL));
493
494
	tlsconnect(server, &lastconnecttry, "clientradput");
	lastconnecttry = server->lastconnecttry;
venaas's avatar
   
venaas committed
495
    }
venaas's avatar
venaas committed
496

497
    server->connectionok = 1;
venaas's avatar
   
venaas committed
498
    printf("clientradput: Sent %d bytes, Radius packet of length %d to TLS peer %s\n",
venaas's avatar
venaas committed
499
	   cnt, len, server->peer.host);
venaas's avatar
   
venaas committed
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
    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;
}
	      
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
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
572
    memcpy(authattr, auth, 16);
573
574
575
576
577
578
579
580
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
606
607
608
609
610
611
612
613
614
615
616
617
618
    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;
}

619
void sendrq(struct server *to, struct client *from, struct request *rq) {
venaas's avatar
   
venaas committed
620
    int i;
621
    
venaas's avatar
   
venaas committed
622
    pthread_mutex_lock(&to->newrq_mutex);
venaas's avatar
venaas committed
623
624
    /* might simplify if only try nextid, might be ok */
    for (i = to->nextid; i < MAX_REQUESTS; i++)
venaas's avatar
   
venaas committed
625
626
627
	if (!to->requests[i].buf)
	    break;
    if (i == MAX_REQUESTS) {
venaas's avatar
venaas committed
628
629
630
631
632
633
634
635
	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
636
    }
venaas's avatar
venaas committed
637
638
    
    to->nextid = i + 1;
venaas's avatar
   
venaas committed
639
    rq->buf[1] = (char)i;
venaas's avatar
venaas committed
640
    printf("sendrq: inserting packet with id %d in queue for %s\n", i, to->peer.host);
venaas's avatar
venaas committed
641
    
642
643
    if (!createmessageauth(rq->buf, rq->messageauthattrval, to->peer.secret))
	return;
venaas's avatar
venaas committed
644

venaas's avatar
   
venaas committed
645
646
647
648
649
650
651
652
653
654
    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);
}

655
void sendreply(struct client *to, struct server *from, char *buf, struct sockaddr_storage *tosa) {
venaas's avatar
   
venaas committed
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
    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
677
int pwdencrypt(uint8_t *in, uint8_t len, uint8_t *shared, uint8_t sharedlen, uint8_t *auth) {
venaas's avatar
venaas committed
678
679
680
681
682
    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
683
    uint8_t i, offset = 0, out[128];
venaas's avatar
venaas committed
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
    
    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
708
    memcpy(in, out, len);
venaas's avatar
venaas committed
709
710
711
712
    pthread_mutex_unlock(&lock);
    return 1;
}

venaas's avatar
venaas committed
713
int pwddecrypt(uint8_t *in, uint8_t len, uint8_t *shared, uint8_t sharedlen, uint8_t *auth) {
venaas's avatar
   
venaas committed
714
715
716
717
718
    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
719
    uint8_t i, offset = 0, out[128];
venaas's avatar
   
venaas committed
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
    
    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
738
739
	    out[offset + i] = hash[i] ^ in[offset + i];
	input = in + offset;
venaas's avatar
   
venaas committed
740
	offset += 16;
venaas's avatar
venaas committed
741
	if (offset == len)
venaas's avatar
   
venaas committed
742
743
	    break;
    }
venaas's avatar
venaas committed
744
    memcpy(in, out, len);
venaas's avatar
   
venaas committed
745
746
747
748
    pthread_mutex_unlock(&lock);
    return 1;
}

venaas's avatar
venaas committed
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
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
800
#if 0	
venaas's avatar
venaas committed
801
802
803
804
	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
805
#endif
venaas's avatar
venaas committed
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
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
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
	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;
}

925
struct server *id2server(char *id, uint8_t len) {
venaas's avatar
venaas committed
926
    int i;
venaas's avatar
venaas committed
927
    char **realm, *idrealm;
venaas's avatar
venaas committed
928

venaas's avatar
venaas committed
929
    idrealm = strchr(id, '@');
venaas's avatar
venaas committed
930
    if (idrealm) {
venaas's avatar
venaas committed
931
	idrealm++;
venaas's avatar
venaas committed
932
933
934
935
936
	len -= idrealm - id;
    } else {
	idrealm = "-";
	len = 1;
    }
937
938
    for (i = 0; i < server_count; i++) {
	for (realm = servers[i].realms; *realm; realm++) {
venaas's avatar
venaas committed
939
940
	    if ((strlen(*realm) == 1 && **realm == '*') ||
		(strlen(*realm) == len && !memcmp(idrealm, *realm, len))) {
venaas's avatar
venaas committed
941
		printf("found matching realm: %s, host %s\n", *realm, servers[i].peer.host);
942
		return servers + i;
venaas's avatar
venaas committed
943
944
945
946
947
948
	    }
	}
    }
    return NULL;
}

venaas's avatar
venaas committed
949
950
951
952
953
954
955
956
957
958
959
960
int rqinqueue(struct server *to, struct client *from, uint8_t id) {
    int i;
    
    pthread_mutex_lock(&to->newrq_mutex);
    for (i = 0; i < MAX_REQUESTS; i++)
	if (to->requests[i].buf && to->requests[i].origid == id && to->requests[i].from == from)
	    break;
    pthread_mutex_unlock(&to->newrq_mutex);
    
    return i < MAX_REQUESTS;
}
	
961
struct server *radsrv(struct request *rq, char *buf, struct client *from) {
venaas's avatar
venaas committed
962
    uint8_t code, id, *auth, *attr, attrvallen;
venaas's avatar
   
venaas committed
963
    uint8_t *usernameattr = NULL, *userpwdattr = NULL, *tunnelpwdattr = NULL, *messageauthattr = NULL;
venaas's avatar
   
venaas committed
964
965
966
    int i;
    uint16_t len;
    int left;
967
    struct server *to;
venaas's avatar
   
venaas committed
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
    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
998
999
1000
1001
1002
1003
	case RAD_Attr_Tunnel_Password:
	    tunnelpwdattr = attr;
	    break;
	case RAD_Attr_Message_Authenticator:
	    messageauthattr = attr;
	    break;
venaas's avatar
   
venaas committed
1004
1005
1006
1007
1008
1009
1010
1011
	}
	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
1012
	for (i = 0; i < usernameattr[RAD_Attr_Length] - 2; i++)
venaas's avatar
   
venaas committed
1013
1014
1015
1016
	    printf("%c", usernameattr[RAD_Attr_Value + i]);
	printf("\n");
    }

1017
    to = id2server(&usernameattr[RAD_Attr_Value], usernameattr[RAD_Attr_Length] - 2);
venaas's avatar
venaas committed
1018
1019
1020
    if (!to) {
	printf("radsrv: ignoring request, don't know where to send it\n");
	return NULL;
venaas's avatar
venaas committed
1021
    }
venaas's avatar
venaas committed
1022
1023
1024
1025
1026

    if (rqinqueue(to, from, id)) {
	printf("radsrv: ignoring request from host %s with id %d, already got one\n", from->peer.host, id);
	return NULL;
    }
venaas's avatar
venaas committed
1027
    
venaas's avatar
   
venaas committed
1028
    if (messageauthattr && (messageauthattr[RAD_Attr_Length] != 18 ||
1029
			    !checkmessageauth(buf, &messageauthattr[RAD_Attr_Value], from->peer.secret))) {
venaas's avatar
   
venaas committed
1030
1031
1032
1033
	printf("radsrv: message authentication failed\n");
	return NULL;
    }

venaas's avatar
venaas committed
1034
1035
1036
1037
1038
1039
1040
1041
    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
1042
1043
    if (userpwdattr) {
	printf("radsrv: found userpwdattr of length %d\n", userpwdattr[RAD_Attr_Length]);
venaas's avatar
   
venaas committed
1044
1045
1046
1047
1048
1049
	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
1050
	if (!pwddecrypt(&userpwdattr[RAD_Attr_Value], attrvallen, from->peer.secret, strlen(from->peer.secret), auth)) {
venaas's avatar
   
venaas committed
1051
1052
1053
1054
1055
	    printf("radsrv: cannot decrypt password\n");
	    return NULL;
	}
	printf("radsrv: password: ");
	for (i = 0; i < attrvallen; i++)
venaas's avatar
venaas committed
1056
	    printf("%02x ", userpwdattr[RAD_Attr_Value + i]);
venaas's avatar
   
venaas committed
1057
	printf("\n");
venaas's avatar
venaas committed
1058
	if (!pwdencrypt(&userpwdattr[RAD_Attr_Value], attrvallen, to->peer.secret, strlen(to->peer.secret), newauth)) {
venaas's avatar
   
venaas committed
1059
1060
1061
1062
1063
1064
1065
1066
1067
	    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
1068
1069
1070
1071
	    printf("radsrv: invalid user password length\n");
	    return NULL;
	}
	
venaas's avatar
venaas committed
1072
	if (!pwddecrypt(&tunnelpwdattr[RAD_Attr_Value], attrvallen, from->peer.secret, strlen(from->peer.secret), auth)) {
venaas's avatar
   
venaas committed
1073
1074
1075
1076
	    printf("radsrv: cannot decrypt password\n");
	    return NULL;
	}
	printf("radsrv: password: ");
venaas's avatar
   
venaas committed
1077
	for (i = 0; i < attrvallen; i++)
venaas's avatar
venaas committed
1078
	    printf("%02x ", tunnelpwdattr[RAD_Attr_Value + i]);
venaas's avatar
   
venaas committed
1079
	printf("\n");
venaas's avatar
venaas committed
1080
	if (!pwdencrypt(&tunnelpwdattr[RAD_Attr_Value], attrvallen, to->peer.secret, strlen(to->peer.secret), newauth)) {
venaas's avatar
   
venaas committed
1081
1082
1083
1084
1085
1086
1087
1088
	    printf("radsrv: cannot encrypt password\n");
	    return NULL;
	}
    }

    rq->buf = buf;
    rq->from = from;
    rq->origid = id;
1089
    rq->messageauthattrval = (messageauthattr ? &messageauthattr[RAD_Attr_Value] : NULL);
venaas's avatar
   
venaas committed
1090
    memcpy(rq->origauth, auth, 16);
venaas's avatar
venaas committed
1091
1092
1093
    memcpy(auth, newauth, 16);
    printauth("rq->origauth", rq->origauth);
    printauth("auth", auth);
venaas's avatar
   
venaas committed
1094
1095
1096
1097
    return to;
}

void *clientrd(void *arg) {
1098
1099
    struct server *server = (struct server *)arg;
    struct client *from;
venaas's avatar
venaas committed
1100
1101
    int i, left, subleft;
    unsigned char *buf, *messageauthattr, *subattr, *attr;
venaas's avatar
   
venaas committed
1102
    struct sockaddr_storage fromsa;
venaas's avatar
venaas committed
1103
    struct timeval lastconnecttry;
venaas's avatar
venaas committed
1104
    char tmp[255];
venaas's avatar
   
venaas committed
1105
1106
    
    for (;;) {
venaas's avatar
venaas committed
1107
    getnext:
1108
	lastconnecttry = server->lastconnecttry;
venaas's avatar
venaas committed
1109
1110
	buf = (server->peer.type == 'U' ? radudpget(server->sock, NULL, &server, NULL) : radtlsget(server->peer.ssl));
	if (!buf && server->peer.type == 'T') {
1111
	    tlsconnect(server, &lastconnecttry, "clientrd");
venaas's avatar
   
venaas committed
1112
1113
	    continue;
	}
1114
1115
    
	server->connectionok = 1;
1116
1117
1118
1119
1120

	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
1121
1122

	printf("got message type: %d, id: %d\n", buf[0], buf[1]);
venaas's avatar
   
venaas committed
1123
1124
1125
	
	i = buf[1]; /* i is the id */

1126
1127
1128
	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
1129
1130
1131
	    printf("clientrd: no matching request sent with this id, ignoring\n");
	    continue;
	}
1132

1133
1134
	if (server->requests[i].received) {
	    pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
   
venaas committed
1135
1136
1137
	    printf("clientrd: already received, ignoring\n");
	    continue;
	}
1138
	
venaas's avatar
venaas committed
1139
	if (!validauth(buf, server->requests[i].buf + 4, server->peer.secret)) {
1140
	    pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
   
venaas committed
1141
1142
1143
	    printf("clientrd: invalid auth, ignoring\n");
	    continue;
	}
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
	
	from = server->requests[i].from;

	/* 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
1154
1155
		printf("clientrd: attribute length exceeds packet length, ignoring packet\n");
		goto getnext;
1156
1157
	    }
	    if (attr[RAD_Attr_Type] == RAD_Attr_Message_Authenticator) {
venaas's avatar
venaas committed
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
		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");
1170
1171
1172
1173
1174
		messageauthattr = attr;
		break;
	    }
	    attr += attr[RAD_Attr_Length];
	}
venaas's avatar
   
venaas committed
1175

venaas's avatar
venaas committed
1176
1177
1178
1179
1180
1181
1182
1183
	/* 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;
1184
	    }
venaas's avatar
venaas committed
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
	    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];
1218
	}
venaas's avatar
venaas committed
1219

venaas's avatar
   
venaas committed
1220
	/* once we set received = 1, requests[i] may be reused */
1221
1222
	buf[1] = (char)server->requests[i].origid;
	memcpy(buf + 4, server->requests[i].origauth, 16);
venaas's avatar
venaas committed
1223
	printauth("origauth/buf+4", buf + 4);
1224
1225
1226
1227
1228
	if (messageauthattr) {
	    if (!createmessageauth(buf, &messageauthattr[RAD_Attr_Value], from->peer.secret))
		continue;
	    printf("clientrd: computed messageauthattr\n");
	}
venaas's avatar
venaas committed
1229

venaas's avatar
venaas committed
1230
	if (from->peer.type == 'U')
1231
1232
1233
	    fromsa = server->requests[i].fromsa;
	server->requests[i].received = 1;
	pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
   
venaas committed
1234

venaas's avatar
venaas committed
1235
	if (!radsign(buf, from->peer.secret)) {
venaas's avatar
   
venaas committed
1236
1237
1238
	    printf("clientrd: failed to sign message\n");
	    continue;
	}
venaas's avatar
venaas committed
1239
	printauth("signedorigauth/buf+4", buf + 4);		
venaas's avatar
   
venaas committed
1240
	printf("clientrd: giving packet back to where it came from\n");
venaas's avatar
venaas committed
1241
	sendreply(from, server, buf, from->peer.type == 'U' ? &fromsa : NULL);
venaas's avatar
   
venaas committed
1242
1243
1244
1245
    }
}

void *clientwr(void *arg) {
1246
    struct server *server = (struct server *)arg;
1247
    struct request *rq;
venaas's avatar
   
venaas committed
1248
1249
    pthread_t clientrdth;
    int i;
1250
    struct timeval now;
venaas's avatar
venaas committed
1251
    struct timespec timeout;
1252
1253

    memset(&timeout, 0, sizeof(struct timespec));
1254
    
venaas's avatar
venaas committed
1255
1256
    if (server->peer.type == 'U') {
	if ((server->sock = connecttoserver(server->peer.addrinfo)) < 0) {
1257
	    printf("clientwr: connecttoserver failed\n");
venaas's avatar
   
venaas committed
1258
1259
1260
	    exit(1);
	}
    } else
1261
	tlsconnect(server, NULL, "new client");
venaas's avatar
   
venaas committed
1262
    
1263
    if (pthread_create(&clientrdth, NULL, clientrd, (void *)server))
venaas's avatar
   
venaas committed
1264
1265
1266
	errx("clientwr: pthread_create failed");

    for (;;) {
1267
	pthread_mutex_lock(&server->newrq_mutex);
venaas's avatar
venaas committed
1268
	if (!server->newrq) {
1269
1270
1271
1272
1273
1274
1275
1276
	    if (timeout.tv_nsec) {
		printf("clientwr: waiting up to %ld secs for new request\n", timeout.tv_nsec);
		pthread_cond_timedwait(&server->newrq_cond, &server->newrq_mutex, &timeout);
		timeout.tv_nsec = 0;
	    } else {
		printf("clientwr: waiting for new request\n");
		pthread_cond_wait(&server->newrq_cond, &server->newrq_mutex);
	    }
venaas's avatar
venaas committed
1277
1278
1279
1280
	    if (server->newrq) {
		printf("clientwr: got new request\n");
		server->newrq = 0;
	    }
venaas's avatar
   
venaas committed
1281
	}
1282
	pthread_mutex_unlock(&server->newrq_mutex);
1283
	
venaas's avatar
   
venaas committed
1284
	for (i = 0; i < MAX_REQUESTS; i++) {
1285
1286
	    pthread_mutex_lock(&server->newrq_mutex);
	    while (!server->requests[i].buf && i < MAX_REQUESTS)
venaas's avatar
   
venaas committed
1287
1288
		i++;
	    if (i == MAX_REQUESTS) {
1289
		pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
   
venaas committed
1290
1291
		break;
	    }
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
	    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;
            }
venaas's avatar
venaas committed
1302
1303
1304
	    
	    gettimeofday(&now, NULL);
            if (now.tv_sec <= rq->expiry.tv_sec) {
1305
1306
		if (!timeout.tv_sec || rq->expiry.tv_sec < timeout.tv_sec)
		    timeout.tv_sec = rq->expiry.tv_sec;
venaas's avatar
venaas committed
1307
1308
1309
1310
1311
		pthread_mutex_unlock(&server->newrq_mutex);
		continue;
	    }

	    if (rq->tries == (server->peer.type == 'T' ? 1 : REQUEST_RETRIES)) {
1312
		printf("clientwr: removing expired packet from queue\n");
venaas's avatar
venaas committed
1313
1314
1315
1316
1317
1318
1319
		free(rq->buf);
		/* setting this to NULL means that it can be reused */
		rq->buf = NULL;
		pthread_mutex_unlock(&server->newrq_mutex);
		continue;
	    }
            pthread_mutex_unlock(&server->newrq_mutex);
1320

1321
1322
1323
1324
	    rq->expiry.tv_sec = now.tv_sec +
		(server->peer.type == 'T' ? REQUEST_EXPIRY : REQUEST_EXPIRY / REQUEST_RETRIES);
	    if (!timeout.tv_sec || rq->expiry.tv_sec < timeout.tv_sec)
		timeout.tv_sec = rq->expiry.tv_sec;
1325
	    rq->tries++;
1326
	    clientradput(server, server->requests[i].buf);
venaas's avatar
venaas committed
1327
	    usleep(200000);
venaas's avatar
   
venaas committed
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
	}
    }
    /* 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;
1361
1362
    struct server *to;
    struct client *fr;
venaas's avatar
   
venaas committed
1363
1364
    pthread_t udpserverwrth;
    
1365
    if ((udp_server_sock = bindport(SOCK_DGRAM, options.udpserverport)) < 0) {
venaas's avatar
   
venaas committed
1366
1367
1368
        printf("udpserverrd: socket/bind failed\n");
	exit(1);
    }
1369
    printf("udpserverrd: listening on UDP port %s\n", options.udpserverport);
venaas's avatar
   
venaas committed
1370
1371
1372
1373
1374
1375
1376

    if (pthread_create(&udpserverwrth, NULL, udpserverwr, NULL))
	errx("pthread_create failed");
    
    for (;;) {
	fr = NULL;
	memset(&rq, 0, sizeof(struct request));
1377
	buf = radudpget(udp_server_sock, &fr, NULL, &rq.fromsa);
venaas's avatar
   
venaas committed
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
	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;
1390
    struct client *client = (struct client *)arg;
venaas's avatar
   
venaas committed
1391
1392
    struct replyq *replyq;
    
1393
1394
1395
    printf("tlsserverwr starting for %s\n", client->peer.host);
    replyq = client->replyq;
    pthread_mutex_lock(&replyq->count_mutex);
venaas's avatar
   
venaas committed
1396
1397
    for (;;) {
	while (!replyq->count) {
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
	    if (client->peer.ssl) {	    
		printf("tls server writer, waiting for signal\n");
		pthread_cond_wait(&replyq->count_cond, &replyq->count_mutex);
		printf("tls server writer, got signal\n");
	    }
	    if (!client->peer.ssl) {
		//ssl might have changed while waiting
		pthread_mutex_unlock(&replyq->count_mutex);
		printf("tlsserverwr: exiting as requested\n");
		pthread_exit(NULL);
	    }
venaas's avatar
   
venaas committed
1409
1410
	}
	pthread_mutex_unlock(&replyq->count_mutex);
venaas's avatar
venaas committed
1411
	cnt = SSL_write(client->peer.ssl, replyq->replies->buf, RADLEN(replyq->replies->buf));
venaas's avatar
   
venaas committed
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
	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;
1430
    struct server *to;
venaas's avatar
   
venaas committed
1431
    int s;