radsecproxy.c 55.5 KB
Newer Older
venaas's avatar
 
venaas committed
1
/*
venaas's avatar
venaas committed
2
 * Copyright (C) 2006, 2007 Stig Venaas <venaas@uninett.no>
venaas's avatar
 
venaas committed
3
4
5
6
7
8
9
 *
 * 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
*/

/* 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
*/

venaas's avatar
venaas committed
38
39
#include <sys/socket.h>
#include <netinet/in.h>
venaas's avatar
 
venaas committed
40
#include <netdb.h>
venaas's avatar
venaas committed
41
#include <string.h>
venaas's avatar
 
venaas committed
42
#include <unistd.h>
venaas's avatar
venaas committed
43
#include <sys/time.h>
venaas's avatar
venaas committed
44
#include <libgen.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
#include "debug.h"
venaas's avatar
venaas committed
52
#include "radsecproxy.h"
venaas's avatar
 
venaas committed
53

54
static struct options options;
55
56
static struct client *clients;
static struct server *servers;
57

58
59
static int client_udp_count = 0;
static int client_tls_count = 0;
60
static int client_count = 0;
61
62
static int server_udp_count = 0;
static int server_tls_count = 0;
63
static int server_count = 0;
venaas's avatar
 
venaas committed
64

venaas's avatar
venaas committed
65
66
static struct peer *tcp_server_listen;
static struct peer *udp_server_listen;
venaas's avatar
 
venaas committed
67
68
69
70
static struct replyq udp_server_replyq;
static int udp_server_sock = -1;
static pthread_mutex_t *ssl_locks;
static long *ssl_lock_count;
71
static SSL_CTX *ssl_ctx = NULL;
venaas's avatar
 
venaas committed
72
73
74
75
76
77
extern int optind;
extern char *optarg;

/* callbacks for making OpenSSL thread safe */
unsigned long ssl_thread_id() {
        return (unsigned long)pthread_self();
venaas's avatar
venaas committed
78
}
venaas's avatar
 
venaas committed
79
80
81
82
83
84
85
86
87

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]);
}

venaas's avatar
venaas committed
88
89
90
91
92
93
94
95
static int pem_passwd_cb(char *buf, int size, int rwflag, void *userdata) {
    int pwdlen = strlen(userdata);
    if (rwflag != 0 || pwdlen > size) /* not for decryption or too large */
	return 0;
    memcpy(buf, userdata, pwdlen);
    return pwdlen;
}

96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
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
132
  /* printf("certificate verify returns %d\n", ok); */
133
134
135
  return ok;
}

136
137
SSL_CTX *ssl_init() {
    SSL_CTX *ctx;
venaas's avatar
 
venaas committed
138
    int i;
139
140
    unsigned long error;
    
venaas's avatar
venaas committed
141
142
143
144
145
    if (!options.tlscertificatefile || !options.tlscertificatekeyfile)
	debug(DBG_ERR, "TLSCertificateFile and TLSCertificateKeyFile must be specified for TLS");

    if (!options.tlscacertificatefile && !options.tlscacertificatepath)
	debug(DBG_ERR, "CA Certificate file/path need to be configured");
venaas's avatar
 
venaas committed
146
147
148
149
150
151
152
153
154

    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);
155
156
157
158
159
160
161
162
163
164
165

    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));
    }

166
    ctx = SSL_CTX_new(TLSv1_method());
venaas's avatar
venaas committed
167
168
169
170
    if (options.tlscertificatekeypassword) {
	SSL_CTX_set_default_passwd_cb_userdata(ctx, options.tlscertificatekeypassword);
	SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_cb);
    }
venaas's avatar
venaas committed
171
172
173
174
175
176
177
178
179
    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;
    }

180
    while ((error = ERR_get_error()))
venaas's avatar
venaas committed
181
182
	debug(DBG_WARN, "SSL: %s", ERR_error_string(error, NULL));
    debug(DBG_ERR, "Error initialising SSL/TLS");
183
}    
venaas's avatar
 
venaas committed
184

venaas's avatar
venaas committed
185
186
187
188
189
190
191
192
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
193
int resolvepeer(struct peer *peer, int ai_flags) {
venaas's avatar
venaas committed
194
    struct addrinfo hints, *addrinfo;
venaas's avatar
 
venaas committed
195
196
    
    memset(&hints, 0, sizeof(hints));
venaas's avatar
venaas committed
197
    hints.ai_socktype = (peer->type == 'T' ? SOCK_STREAM : SOCK_DGRAM);
venaas's avatar
 
venaas committed
198
    hints.ai_family = AF_UNSPEC;
venaas's avatar
venaas committed
199
    hints.ai_flags = ai_flags;
venaas's avatar
venaas committed
200
    if (getaddrinfo(peer->host, peer->port, &hints, &addrinfo)) {
venaas's avatar
venaas committed
201
	debug(DBG_WARN, "resolvepeer: can't resolve %s port %s", peer->host, peer->port);
venaas's avatar
 
venaas committed
202
203
	return 0;
    }
204

venaas's avatar
venaas committed
205
206
207
    if (peer->addrinfo)
	freeaddrinfo(peer->addrinfo);
    peer->addrinfo = addrinfo;
venaas's avatar
 
venaas committed
208
209
210
    return 1;
}	  

211
int connecttoserver(struct addrinfo *addrinfo) {
venaas's avatar
 
venaas committed
212
213
214
    int s;
    struct addrinfo *res;
    
215
    for (res = addrinfo; res; res = res->ai_next) {
venaas's avatar
 
venaas committed
216
217
        s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
        if (s < 0) {
218
            err("connecttoserver: socket failed");
venaas's avatar
 
venaas committed
219
220
221
222
            continue;
        }
        if (connect(s, res->ai_addr, res->ai_addrlen) == 0)
            break;
223
        err("connecttoserver: connect failed");
venaas's avatar
 
venaas committed
224
225
226
227
228
229
        close(s);
        s = -1;
    }
    return s;
}	  

venaas's avatar
venaas committed
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
int bindtoaddr(struct addrinfo *addrinfo) {
    int s, on = 1;
    struct addrinfo *res;
    
    for (res = addrinfo; res; res = res->ai_next) {
        s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
        if (s < 0) {
            err("bindtoaddr: socket failed");
            continue;
        }
	setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
	if (!bind(s, res->ai_addr, res->ai_addrlen))
	    return s;
	err("bindtoaddr: bind failed");
        close(s);
    }
    return -1;
}	  

249
250
251
/* 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
252
253
    struct sockaddr_in6 *sa6;
    struct in_addr *a4 = NULL;
254
    struct client *c;
venaas's avatar
 
venaas committed
255
256
257
258
259
260
261
262
263
264
    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;

265
266
    c = (client ? client : clients);
    for (i = 0; i < client_count; i++) {
venaas's avatar
venaas committed
267
268
	if (c->peer.type == type)
	    for (res = c->peer.addrinfo; res; res = res->ai_next)
venaas's avatar
 
venaas committed
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)))
273
274
		    return c;
	if (client)
venaas's avatar
 
venaas committed
275
	    break;
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
	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
299
300
	if (s->peer.type == type)
	    for (res = s->peer.addrinfo; res; res = res->ai_next)
301
302
303
304
305
306
307
308
		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
309
310
311
312
    }
    return NULL;
}

313
/* exactly one of client and server must be non-NULL */
venaas's avatar
 
venaas committed
314
315
/* if *peer == NULL we return who we received from, else require it to be from peer */
/* return from in sa if not NULL */
316
unsigned char *radudpget(int s, struct client **client, struct server **server, struct sockaddr_storage *sa) {
venaas's avatar
 
venaas committed
317
    int cnt, len;
318
    void *f;
venaas's avatar
 
venaas committed
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 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);

345
346
347
	f = (client
	     ? (void *)find_client('U', (struct sockaddr *)&from, *client)
	     : (void *)find_server('U', (struct sockaddr *)&from, *server));
venaas's avatar
 
venaas committed
348
349
350
351
352
353
354
355
356
357
358
	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);
359
360
361
362
    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
363
364
365
366
367
    if (sa)
	*sa = from;
    return rad;
}

368
369
370
371
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
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");
venaas's avatar
venaas committed
403
	if (l == strlen(peer->host) && !strncasecmp(peer->host, (char *)v, l)) {
404
405
406
407
408
409
410
411
412
	    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;
}

413
void tlsconnect(struct server *server, struct timeval *when, char *text) {
venaas's avatar
venaas committed
414
415
    struct timeval now;
    time_t elapsed;
venaas's avatar
venaas committed
416

venaas's avatar
venaas committed
417
    printf("tlsconnect called from %s\n", text);
418
419
    pthread_mutex_lock(&server->lock);
    if (when && memcmp(&server->lastconnecttry, when, sizeof(struct timeval))) {
venaas's avatar
 
venaas committed
420
	/* already reconnected, nothing to do */
venaas's avatar
venaas committed
421
	printf("tlsconnect(%s): seems already reconnected\n", text);
422
	pthread_mutex_unlock(&server->lock);
venaas's avatar
 
venaas committed
423
424
425
	return;
    }

venaas's avatar
venaas committed
426
427
    printf("tlsconnect %s\n", text);

venaas's avatar
 
venaas committed
428
    for (;;) {
venaas's avatar
venaas committed
429
	gettimeofday(&now, NULL);
430
431
432
	elapsed = now.tv_sec - server->lastconnecttry.tv_sec;
	if (server->connectionok) {
	    server->connectionok = 0;
venaas's avatar
venaas committed
433
434
435
	    sleep(10);
	} else if (elapsed < 5)
	    sleep(10);
venaas's avatar
venaas committed
436
437
438
439
440
441
442
	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
443
	    server->lastconnecttry.tv_sec = now.tv_sec;  /* no sleep at startup */
venaas's avatar
venaas committed
444
	printf("tlsconnect: trying to open TLS connection to %s port %s\n", server->peer.host, server->peer.port);
445
446
	if (server->sock >= 0)
	    close(server->sock);
venaas's avatar
venaas committed
447
	if ((server->sock = connecttoserver(server->peer.addrinfo)) < 0)
venaas's avatar
venaas committed
448
	    continue;
venaas's avatar
venaas committed
449
	SSL_free(server->peer.ssl);
450
	server->peer.ssl = SSL_new(ssl_ctx);
venaas's avatar
venaas committed
451
	SSL_set_fd(server->peer.ssl, server->sock);
452
	if (SSL_connect(server->peer.ssl) > 0 && tlsverifycert(&server->peer))
venaas's avatar
 
venaas committed
453
454
	    break;
    }
venaas's avatar
venaas committed
455
    printf("tlsconnect: TLS connection to %s port %s up\n", server->peer.host, server->peer.port);
venaas's avatar
venaas committed
456
    gettimeofday(&server->lastconnecttry, NULL);
457
    pthread_mutex_unlock(&server->lock);
venaas's avatar
 
venaas committed
458
459
460
461
462
463
464
465
466
467
468
}

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");
469
		if (SSL_get_error(ssl, cnt) == SSL_ERROR_ZERO_RETURN) {
venaas's avatar
venaas committed
470
		    /* remote end sent close_notify, send one back */
471
472
		    SSL_shutdown(ssl);
		}
venaas's avatar
 
venaas committed
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
		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");
489
		if (SSL_get_error(ssl, cnt) == SSL_ERROR_ZERO_RETURN) {
venaas's avatar
venaas committed
490
		    /* remote end sent close_notify, send one back */
491
492
		    SSL_shutdown(ssl);
		}
venaas's avatar
 
venaas committed
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
		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;
}

509
int clientradput(struct server *server, unsigned char *rad) {
venaas's avatar
venaas committed
510
    int cnt;
venaas's avatar
 
venaas committed
511
512
    size_t len;
    unsigned long error;
venaas's avatar
venaas committed
513
514
    struct timeval lastconnecttry;
    
venaas's avatar
 
venaas committed
515
    len = RADLEN(rad);
venaas's avatar
venaas committed
516
    if (server->peer.type == 'U') {
517
	if (send(server->sock, rad, len, 0) >= 0) {
venaas's avatar
venaas committed
518
	    printf("clienradput: sent UDP of length %d to %s port %s\n", len, server->peer.host, server->peer.port);
venaas's avatar
 
venaas committed
519
520
521
522
523
524
	    return 1;
	}
	err("clientradput: send failed");
	return 0;
    }

525
    lastconnecttry = server->lastconnecttry;
venaas's avatar
venaas committed
526
    while ((cnt = SSL_write(server->peer.ssl, rad, len)) <= 0) {
venaas's avatar
 
venaas committed
527
	while ((error = ERR_get_error()))
528
	    err("clientradput: TLS: %s", ERR_error_string(error, NULL));
529
530
	tlsconnect(server, &lastconnecttry, "clientradput");
	lastconnecttry = server->lastconnecttry;
venaas's avatar
 
venaas committed
531
    }
venaas's avatar
venaas committed
532

533
    server->connectionok = 1;
venaas's avatar
 
venaas committed
534
    printf("clientradput: Sent %d bytes, Radius packet of length %d to TLS peer %s\n",
venaas's avatar
venaas committed
535
	   cnt, len, server->peer.host);
venaas's avatar
 
venaas committed
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
    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)) &&
venaas's avatar
venaas committed
554
	EVP_DigestUpdate(&mdctx, sec, strlen((char *)sec)) &&
venaas's avatar
 
venaas committed
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
	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)) &&
venaas's avatar
venaas committed
581
	      EVP_DigestUpdate(&mdctx, sec, strlen((char *)sec)) &&
venaas's avatar
 
venaas committed
582
583
584
585
586
587
588
	      EVP_DigestFinal_ex(&mdctx, hash, &len) &&
	      len == 16 &&
	      !memcmp(hash, rad + 4, 16));
    pthread_mutex_unlock(&lock);
    return result;
}
	      
venaas's avatar
venaas committed
589
int checkmessageauth(unsigned char *rad, uint8_t *authattr, char *secret) {
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
    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
608
    memcpy(authattr, auth, 16);
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
    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;
}

venaas's avatar
venaas committed
625
int createmessageauth(unsigned char *rad, unsigned char *authattrval, char *secret) {
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
    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;
}

655
void sendrq(struct server *to, struct client *from, struct request *rq) {
venaas's avatar
 
venaas committed
656
    int i;
657
    
venaas's avatar
 
venaas committed
658
    pthread_mutex_lock(&to->newrq_mutex);
venaas's avatar
venaas committed
659
660
    /* might simplify if only try nextid, might be ok */
    for (i = to->nextid; i < MAX_REQUESTS; i++)
venaas's avatar
 
venaas committed
661
662
663
	if (!to->requests[i].buf)
	    break;
    if (i == MAX_REQUESTS) {
venaas's avatar
venaas committed
664
665
666
667
668
669
670
671
	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
672
    }
venaas's avatar
venaas committed
673
674
    
    to->nextid = i + 1;
venaas's avatar
 
venaas committed
675
    rq->buf[1] = (char)i;
venaas's avatar
venaas committed
676
    printf("sendrq: inserting packet with id %d in queue for %s\n", i, to->peer.host);
venaas's avatar
venaas committed
677
    
678
679
    if (!createmessageauth(rq->buf, rq->messageauthattrval, to->peer.secret))
	return;
venaas's avatar
venaas committed
680

venaas's avatar
 
venaas committed
681
682
683
684
685
686
687
688
689
690
    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);
}

venaas's avatar
venaas committed
691
void sendreply(struct client *to, struct server *from, unsigned char *buf, struct sockaddr_storage *tosa) {
venaas's avatar
 
venaas committed
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
    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
713
int pwdencrypt(uint8_t *in, uint8_t len, char *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
    
    pthread_mutex_lock(&lock);
    if (first) {
	EVP_MD_CTX_init(&mdctx);
	first = 0;
    }

    input = auth;
    for (;;) {
	if (!EVP_DigestInit_ex(&mdctx, EVP_md5(), NULL) ||
venaas's avatar
venaas committed
730
	    !EVP_DigestUpdate(&mdctx, (uint8_t *)shared, sharedlen) ||
venaas's avatar
venaas committed
731
732
733
734
735
736
737
738
739
740
741
742
743
	    !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
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
int pwddecrypt(uint8_t *in, uint8_t len, char *shared, uint8_t sharedlen, uint8_t *auth) {
venaas's avatar
 
venaas committed
750
751
752
753
754
    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
755
    uint8_t i, offset = 0, out[128];
venaas's avatar
 
venaas committed
756
757
758
759
760
761
762
763
764
765
    
    pthread_mutex_lock(&lock);
    if (first) {
	EVP_MD_CTX_init(&mdctx);
	first = 0;
    }

    input = auth;
    for (;;) {
	if (!EVP_DigestInit_ex(&mdctx, EVP_md5(), NULL) ||
venaas's avatar
venaas committed
766
	    !EVP_DigestUpdate(&mdctx, (uint8_t *)shared, sharedlen) ||
venaas's avatar
 
venaas committed
767
768
769
770
771
772
773
	    !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
774
775
	    out[offset + i] = hash[i] ^ in[offset + i];
	input = in + offset;
venaas's avatar
 
venaas committed
776
	offset += 16;
venaas's avatar
venaas committed
777
	if (offset == len)
venaas's avatar
 
venaas committed
778
779
	    break;
    }
venaas's avatar
venaas committed
780
    memcpy(in, out, len);
venaas's avatar
 
venaas committed
781
782
783
784
    pthread_mutex_unlock(&lock);
    return 1;
}

venaas's avatar
venaas committed
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
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
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
836
#if 0	
venaas's avatar
venaas committed
837
838
839
840
	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
841
#endif
venaas's avatar
venaas committed
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
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
	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;
}

961
struct server *id2server(char *id, uint8_t len) {
venaas's avatar
venaas committed
962
    int i;
venaas's avatar
venaas committed
963
    char **realm, *idrealm;
venaas's avatar
venaas committed
964

venaas's avatar
venaas committed
965
    idrealm = strchr(id, '@');
venaas's avatar
venaas committed
966
    if (idrealm) {
venaas's avatar
venaas committed
967
	idrealm++;
venaas's avatar
venaas committed
968
969
970
971
972
	len -= idrealm - id;
    } else {
	idrealm = "-";
	len = 1;
    }
973
974
    for (i = 0; i < server_count; i++) {
	for (realm = servers[i].realms; *realm; realm++) {
venaas's avatar
venaas committed
975
976
	    if ((strlen(*realm) == 1 && **realm == '*') ||
		(strlen(*realm) == len && !memcmp(idrealm, *realm, len))) {
venaas's avatar
venaas committed
977
		printf("found matching realm: %s, host %s\n", *realm, servers[i].peer.host);
978
		return servers + i;
venaas's avatar
venaas committed
979
980
981
982
983
984
	    }
	}
    }
    return NULL;
}

venaas's avatar
venaas committed
985
986
987
988
989
990
991
992
993
994
995
996
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;
}
	
venaas's avatar
venaas committed
997
struct server *radsrv(struct request *rq, unsigned char *buf, struct client *from) {
venaas's avatar
venaas committed
998
    uint8_t code, id, *auth, *attr, attrvallen;
venaas's avatar
   
venaas committed
999
    uint8_t *usernameattr = NULL, *userpwdattr = NULL, *tunnelpwdattr = NULL, *messageauthattr = NULL;
venaas's avatar
 
venaas committed
1000
1001
1002
    int i;
    uint16_t len;
    int left;
1003
    struct server *to;
venaas's avatar
 
venaas committed
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
    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
1034
1035
1036
1037
1038
1039
	case RAD_Attr_Tunnel_Password:
	    tunnelpwdattr = attr;
	    break;
	case RAD_Attr_Message_Authenticator:
	    messageauthattr = attr;
	    break;
venaas's avatar
 
venaas committed
1040
1041
1042
1043
1044
1045
1046
1047
	}
	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
1048
	for (i = 0; i < usernameattr[RAD_Attr_Length] - 2; i++)
venaas's avatar
 
venaas committed
1049
1050
1051
1052
	    printf("%c", usernameattr[RAD_Attr_Value + i]);
	printf("\n");
    }

venaas's avatar
venaas committed
1053
    to = id2server((char *)&usernameattr[RAD_Attr_Value], usernameattr[RAD_Attr_Length] - 2);
venaas's avatar
venaas committed
1054
1055
1056
    if (!to) {
	printf("radsrv: ignoring request, don't know where to send it\n");
	return NULL;
venaas's avatar
venaas committed
1057
    }
venaas's avatar
venaas committed
1058
1059
1060
1061
1062

    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
1063
    
venaas's avatar
   
venaas committed
1064
    if (messageauthattr && (messageauthattr[RAD_Attr_Length] != 18 ||
1065
			    !checkmessageauth(buf, &messageauthattr[RAD_Attr_Value], from->peer.secret))) {
venaas's avatar
   
venaas committed
1066
1067
1068
1069
	printf("radsrv: message authentication failed\n");
	return NULL;
    }

venaas's avatar
venaas committed
1070
1071
1072
1073
1074
1075
1076
1077
    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
1078
1079
    if (userpwdattr) {
	printf("radsrv: found userpwdattr of length %d\n", userpwdattr[RAD_Attr_Length]);
venaas's avatar
   
venaas committed
1080
1081
1082
1083
1084
1085
	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
1086
	if (!pwddecrypt(&userpwdattr[RAD_Attr_Value], attrvallen, from->peer.secret, strlen(from->peer.secret), auth)) {
venaas's avatar
   
venaas committed
1087
1088
1089
1090
1091
	    printf("radsrv: cannot decrypt password\n");
	    return NULL;
	}
	printf("radsrv: password: ");
	for (i = 0; i < attrvallen; i++)
venaas's avatar
venaas committed
1092
	    printf("%02x ", userpwdattr[RAD_Attr_Value + i]);
venaas's avatar
   
venaas committed
1093
	printf("\n");
venaas's avatar
venaas committed
1094
	if (!pwdencrypt(&userpwdattr[RAD_Attr_Value], attrvallen, to->peer.secret, strlen(to->peer.secret), newauth)) {
venaas's avatar
   
venaas committed
1095
1096
1097
1098
1099
1100
1101
1102
1103
	    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
1104
1105
1106
1107
	    printf("radsrv: invalid user password length\n");
	    return NULL;
	}
	
venaas's avatar
venaas committed
1108
	if (!pwddecrypt(&tunnelpwdattr[RAD_Attr_Value], attrvallen, from->peer.secret, strlen(from->peer.secret), auth)) {
venaas's avatar
 
venaas committed
1109
1110
1111
1112
	    printf("radsrv: cannot decrypt password\n");
	    return NULL;
	}
	printf("radsrv: password: ");
venaas's avatar
   
venaas committed
1113
	for (i = 0; i < attrvallen; i++)
venaas's avatar
venaas committed
1114
	    printf("%02x ", tunnelpwdattr[RAD_Attr_Value + i]);
venaas's avatar
 
venaas committed
1115
	printf("\n");
venaas's avatar
venaas committed
1116
	if (!pwdencrypt(&tunnelpwdattr[RAD_Attr_Value], attrvallen, to->peer.secret, strlen(to->peer.secret), newauth)) {
venaas's avatar
 
venaas committed
1117
1118
1119
1120
1121
1122
1123
1124
	    printf("radsrv: cannot encrypt password\n");
	    return NULL;
	}
    }

    rq->buf = buf;
    rq->from = from;
    rq->origid = id;
1125
    rq->messageauthattrval = (messageauthattr ? &messageauthattr[RAD_Attr_Value] : NULL);
venaas's avatar
 
venaas committed
1126
    memcpy(rq->origauth, auth, 16);
venaas's avatar
venaas committed
1127
    memcpy(auth, newauth, 16);
venaas's avatar
venaas committed
1128
    printauth("rq->origauth", (unsigned char *)rq->origauth);
venaas's avatar
venaas committed
1129
    printauth("auth", auth);
venaas's avatar
 
venaas committed
1130
1131
1132
1133
    return to;
}

void *clientrd(void *arg) {
1134
1135
    struct server *server = (struct server *)arg;
    struct client *from;
venaas's avatar
venaas committed
1136
1137
    int i, left, subleft;
    unsigned char *buf, *messageauthattr, *subattr, *attr;
venaas's avatar
 
venaas committed
1138
    struct sockaddr_storage fromsa;
venaas's avatar
venaas committed
1139
    struct timeval lastconnecttry;
venaas's avatar
venaas committed
1140
    char tmp[255];
venaas's avatar
 
venaas committed
1141
1142
    
    for (;;) {
venaas's avatar
venaas committed
1143
    getnext:
1144
	lastconnecttry = server->lastconnecttry;
venaas's avatar
venaas committed
1145
1146
	buf = (server->peer.type == 'U' ? radudpget(server->sock, NULL, &server, NULL) : radtlsget(server->peer.ssl));
	if (!buf && server->peer.type == 'T') {
1147
	    tlsconnect(server, &lastconnecttry, "clientrd");
venaas's avatar
 
venaas committed
1148
1149
	    continue;
	}
1150
1151
    
	server->connectionok = 1;
1152
1153
1154
1155
1156

	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
1157
1158

	printf("got message type: %d, id: %d\n", buf[0], buf[1]);
venaas's avatar
 
venaas committed
1159
1160
1161
	
	i = buf[1]; /* i is the id */

1162
1163
1164
	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
1165
1166
1167
	    printf("clientrd: no matching request sent with this id, ignoring\n");
	    continue;
	}
1168

1169
1170
	if (server->requests[i].received) {
	    pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
 
venaas committed
1171
1172
1173
	    printf("clientrd: already received, ignoring\n");
	    continue;
	}
1174
	
venaas's avatar
venaas committed
1175
	if (!validauth(buf, server->requests[i].buf + 4, (unsigned char *)server->peer.secret)) {
1176
	    pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
 
venaas committed
1177
1178
1179
	    printf("clientrd: invalid auth, ignoring\n");
	    continue;
	}
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
	
	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
1190
1191
		printf("clientrd: attribute length exceeds packet length, ignoring packet\n");
		goto getnext;
1192
1193
	    }
	    if (attr[RAD_Attr_Type] == RAD_Attr_Message_Authenticator) {
venaas's avatar
venaas committed
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
		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");
1206
1207
1208
1209
1210
		messageauthattr = attr;
		break;
	    }
	    attr += attr[RAD_Attr_Length];
	}
venaas's avatar
 
venaas committed
1211

venaas's avatar
venaas committed
1212
1213
1214
1215
1216
1217
1218
1219
	/* 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;
1220
	    }
venaas's avatar
venaas committed
1221
	    if (attr[RAD_Attr_Type] == RAD_Attr_Vendor_Specific &&
venaas's avatar
venaas committed
1222
		((uint16_t *)attr)[1] == 0 && ntohs(((uint16_t *)attr)[2]) == 311) { /* 311 == MS */
venaas's avatar
venaas committed
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
		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;

venaas's avatar
venaas committed
1236
1237
		    if (!msmppdecrypt(subattr + 4, subattr[RAD_Attr_Length] - 4, (unsigned char *)server->peer.secret,
				      strlen(server->peer.secret), server->requests[i].buf + 4, subattr + 2)) {
venaas's avatar
venaas committed
1238
1239
1240
1241
			printf("clientrd: failed to decrypt msppe key\n");
			continue;
		    }

venaas's avatar
venaas committed
1242
1243
		    if (!msmppencrypt(subattr + 4, subattr[RAD_Attr_Length] - 4, (unsigned char *)from->peer.secret,
				      strlen(from->peer.secret), (unsigned char *)server->requests[i].origauth, subattr + 2)) {
venaas's avatar
venaas committed
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
			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];
1254
	}
venaas's avatar
venaas committed
1255

venaas's avatar
 
venaas committed
1256
	/* once we set received = 1, requests[i] may be reused */
1257
1258
	buf[1] = (char)server->requests[i].origid;
	memcpy(buf + 4, server->requests[i].origauth, 16);
venaas's avatar
venaas committed
1259
	printauth("origauth/buf+4", buf + 4);
1260
1261
1262
1263
1264
	if (messageauthattr) {
	    if (!createmessageauth(buf, &messageauthattr[RAD_Attr_Value], from->peer.secret))
		continue;
	    printf("clientrd: computed messageauthattr\n");
	}
venaas's avatar
venaas committed
1265

venaas's avatar
venaas committed
1266
	if (from->peer.type == 'U')
1267
1268
1269
	    fromsa = server->requests[i].fromsa;
	server->requests[i].received = 1;
	pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
 
venaas committed
1270

venaas's avatar
venaas committed
1271
	if (!radsign(buf, (unsigned char *)from->peer.secret)) {
venaas's avatar
 
venaas committed
1272
1273
1274
	    printf("clientrd: failed to sign message\n");
	    continue;
	}
venaas's avatar
venaas committed
1275
	printauth("signedorigauth/buf+4", buf + 4);		
venaas's avatar
 
venaas committed
1276
	printf("clientrd: giving packet back to where it came from\n");
venaas's avatar
venaas committed
1277
	sendreply(from, server, buf, from->peer.type == 'U' ? &fromsa : NULL);
venaas's avatar
 
venaas committed
1278
1279
1280
1281
    }
}

void *clientwr(void *arg) {
1282
    struct server *server = (struct server *)arg;
1283
    struct request *rq;
venaas's avatar
 
venaas committed
1284
1285
    pthread_t clientrdth;
    int i;
1286
1287
    uint8_t rnd;
    struct timeval now, lastsend;
venaas's avatar
venaas committed
1288
    struct timespec timeout;
1289

1290
    memset(&lastsend, 0, sizeof(struct timeval));
1291
    memset(&timeout, 0, sizeof(struct timespec));
1292

venaas's avatar
venaas committed
1293
1294
    if (server->peer.type == 'U') {
	if ((server->sock = connecttoserver(server->peer.addrinfo)) < 0) {
1295
	    printf("clientwr: connecttoserver failed\n");
venaas's avatar
 
venaas committed
1296
1297
1298
	    exit(1);
	}
    } else
1299
	tlsconnect(server, NULL, "new client");
venaas's avatar
 
venaas committed
1300
    
1301
    if (pthread_create(&clientrdth, NULL, clientrd, (void *)server))
venaas's avatar
 
venaas committed
1302
1303
1304
	errx("clientwr: pthread_create failed");

    for (;;) {
1305
	pthread_mutex_lock(&server->newrq_mutex);
venaas's avatar
venaas committed
1306
	if (!server->newrq) {
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
	    gettimeofday(&now, NULL);
	    if (timeout.tv_sec) {
		printf("clientwr: waiting up to %ld secs for new request\n", timeout.tv_sec - now.tv_sec);
		pthread_cond_timedwait(&server->newrq_cond, &server->newrq_mutex, &timeout);
		timeout.tv_sec = 0;
	    } else if (options.statusserver) {
		timeout.tv_sec = now.tv_sec + STATUS_SERVER_PERIOD;
		/* add random 0-7 seconds to timeout */
		RAND_bytes(&rnd, 1);
		timeout.tv_sec += rnd / 32;
1317
		pthread_cond_timedwait(&server->newrq_cond, &server->newrq_mutex, &timeout);
1318
		timeout.tv_sec = 0;
1319
1320
1321
1322
	    } else {
		printf("clientwr: waiting for new request\n");
		pthread_cond_wait(&server->newrq_cond, &server->newrq_mutex);
	    }
1323
1324
1325
	}
	if (server->newrq) {
	    printf("clientwr: got new request\n");
1326
	    server->newrq = 0;
1327
1328
	} else
	    printf("clientwr: request timer expired, processing request queue\n");
1329
	pthread_mutex_unlock(&server->newrq_mutex);
1330

venaas's avatar
 
venaas committed
1331
	for (i = 0; i < MAX_REQUESTS; i++) {
1332
1333
	    pthread_mutex_lock(&server->newrq_mutex);
	    while (!server->requests[i].buf && i < MAX_REQUESTS)
venaas's avatar
 
venaas committed
1334
1335
		i++;
	    if (i == MAX_REQUESTS) {
1336
		pthread_mutex_unlock(&server->newrq_mutex);
venaas's avatar
 
venaas committed
1337
1338
		break;
	    }
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
	    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
1349
1350
1351
	    
	    gettimeofday(&now, NULL);
            if (now.tv_sec <= rq->expiry.tv_sec) {
1352
1353
		if (!timeout.tv_sec || rq->expiry.tv_sec < timeout.tv_sec)
		    timeout.tv_sec = rq->expiry.tv_sec;
venaas's avatar
venaas committed
1354
1355
1356
1357
1358
		pthread_mutex_unlock(&server->newrq_mutex);
		continue;
	    }

	    if (rq->tries == (server->peer.type == 'T' ? 1 : REQUEST_RETRIES)) {
1359
		printf("clientwr: removing expired packet from queue\n");
venaas's avatar
venaas committed
1360
1361
1362
1363
1364
1365
1366
		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);
1367

1368
1369
1370
1371
	    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;
1372
	    rq->tries++;
venaas's avatar