radsecproxy.c 64.8 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
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
 *
 * 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.
 */

/* 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
32
33
#include <sys/socket.h>
#include <netinet/in.h>
venaas's avatar
 
venaas committed
34
#include <netdb.h>
venaas's avatar
venaas committed
35
#include <string.h>
venaas's avatar
 
venaas committed
36
#include <unistd.h>
venaas's avatar
venaas committed
37
#include <sys/time.h>
venaas's avatar
venaas committed
38
#include <regex.h>
venaas's avatar
venaas committed
39
#include <libgen.h>
venaas's avatar
 
venaas committed
40
41
42
43
44
#include <pthread.h>
#include <openssl/ssl.h>
#include <openssl/rand.h>
#include <openssl/err.h>
#include <openssl/md5.h>
venaas's avatar
venaas committed
45
#include <openssl/hmac.h>
venaas's avatar
venaas committed
46
#include "debug.h"
venaas's avatar
venaas committed
47
#include "radsecproxy.h"
venaas's avatar
 
venaas committed
48

49
static struct options options;
venaas's avatar
venaas committed
50
51
static struct client *clients = NULL;
static struct server *servers = NULL;
52
static struct realm *realms = NULL;
53

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

venaas's avatar
venaas committed
62
63
static struct peer *tcp_server_listen;
static struct peer *udp_server_listen;
venaas's avatar
 
venaas committed
64
65
66
67
static struct replyq udp_server_replyq;
static int udp_server_sock = -1;
static pthread_mutex_t *ssl_locks;
static long *ssl_lock_count;
68
static SSL_CTX *ssl_ctx = NULL;
venaas's avatar
 
venaas committed
69
70
71
72
73
74
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
75
}
venaas's avatar
 
venaas committed
76
77
78
79
80
81
82
83
84

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
85
86
87
88
89
90
91
92
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;
}

93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
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);
110
      debug(DBG_WARN, "verify error: num=%d:%s:depth=%d:%s", err, X509_verify_cert_error_string(err), depth, buf);
111
112
113
114

      switch (err) {
      case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
	  X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), buf, 256);
115
	  debug(DBG_WARN, "\tIssuer=%s", buf);
116
117
118
	  break;
      case X509_V_ERR_CERT_NOT_YET_VALID:
      case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
119
	  debug(DBG_WARN, "\tCertificate not yet valid");
120
121
	  break;
      case X509_V_ERR_CERT_HAS_EXPIRED:
122
	  debug(DBG_WARN, "Certificate has expired");
123
124
	  break;
      case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
125
	  debug(DBG_WARN, "Certificate no longer valid (after notAfter)");
126
127
128
	  break;
      }
  }
129
130
131
#ifdef DEBUG  
  printf("certificate verify returns %d\n", ok);
#endif  
132
133
134
  return ok;
}

135
136
SSL_CTX *ssl_init() {
    SSL_CTX *ctx;
venaas's avatar
 
venaas committed
137
    int i;
138
139
    unsigned long error;
    
venaas's avatar
venaas committed
140
    if (!options.tlscertificatefile || !options.tlscertificatekeyfile)
141
	debugx(1, DBG_ERR, "TLSCertificateFile and TLSCertificateKeyFile must be specified for TLS");
venaas's avatar
venaas committed
142
143

    if (!options.tlscacertificatefile && !options.tlscacertificatepath)
144
	debugx(1, DBG_ERR, "CA Certificate file/path need to be configured");
venaas's avatar
 
venaas committed
145
146
147
148
149
150
151
152
153

    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);
154
155
156
157
158
159
160
161
162
163
164

    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));
    }

165
    ctx = SSL_CTX_new(TLSv1_method());
venaas's avatar
venaas committed
166
167
168
169
    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
170
171
172
173
174
175
176
177
178
    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;
    }

179
    while ((error = ERR_get_error()))
180
	debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
venaas's avatar
venaas committed
181
    debug(DBG_ERR, "Error initialising SSL/TLS");
182
    exit(1);
183
}    
venaas's avatar
 
venaas committed
184

185
#ifdef DEBUG
venaas's avatar
venaas committed
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");
}
193
#endif
venaas's avatar
venaas committed
194

venaas's avatar
venaas committed
195
int resolvepeer(struct peer *peer, int ai_flags) {
venaas's avatar
venaas committed
196
    struct addrinfo hints, *addrinfo;
venaas's avatar
 
venaas committed
197
198
    
    memset(&hints, 0, sizeof(hints));
venaas's avatar
venaas committed
199
    hints.ai_socktype = (peer->type == 'T' ? SOCK_STREAM : SOCK_DGRAM);
venaas's avatar
 
venaas committed
200
    hints.ai_family = AF_UNSPEC;
venaas's avatar
venaas committed
201
    hints.ai_flags = ai_flags;
venaas's avatar
venaas committed
202
    if (getaddrinfo(peer->host, peer->port, &hints, &addrinfo)) {
venaas's avatar
venaas committed
203
	debug(DBG_WARN, "resolvepeer: can't resolve %s port %s", peer->host, peer->port);
venaas's avatar
 
venaas committed
204
205
	return 0;
    }
206

venaas's avatar
venaas committed
207
208
209
    if (peer->addrinfo)
	freeaddrinfo(peer->addrinfo);
    peer->addrinfo = addrinfo;
venaas's avatar
 
venaas committed
210
211
212
    return 1;
}	  

213
int connecttoserver(struct addrinfo *addrinfo) {
venaas's avatar
 
venaas committed
214
215
    int s;
    struct addrinfo *res;
216
217

    s = -1;
218
    for (res = addrinfo; res; res = res->ai_next) {
venaas's avatar
 
venaas committed
219
220
        s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
        if (s < 0) {
221
            debug(DBG_WARN, "connecttoserver: socket failed");
venaas's avatar
 
venaas committed
222
223
224
225
            continue;
        }
        if (connect(s, res->ai_addr, res->ai_addrlen) == 0)
            break;
226
        debug(DBG_WARN, "connecttoserver: connect failed");
venaas's avatar
 
venaas committed
227
228
229
230
231
232
        close(s);
        s = -1;
    }
    return s;
}	  

venaas's avatar
venaas committed
233
234
235
236
237
238
239
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) {
240
            debug(DBG_WARN, "bindtoaddr: socket failed");
venaas's avatar
venaas committed
241
242
243
244
245
            continue;
        }
	setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
	if (!bind(s, res->ai_addr, res->ai_addrlen))
	    return s;
246
	debug(DBG_WARN, "bindtoaddr: bind failed");
venaas's avatar
venaas committed
247
248
249
250
251
        close(s);
    }
    return -1;
}	  

252
253
254
/* 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) {
255
    struct sockaddr_in6 *sa6 = NULL;
venaas's avatar
 
venaas committed
256
    struct in_addr *a4 = NULL;
257
    struct client *c;
venaas's avatar
 
venaas committed
258
259
260
261
262
263
264
265
266
267
    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;

268
269
    c = (client ? client : clients);
    for (i = 0; i < client_count; i++) {
venaas's avatar
venaas committed
270
271
	if (c->peer.type == type)
	    for (res = c->peer.addrinfo; res; res = res->ai_next)
venaas's avatar
 
venaas committed
272
273
274
275
		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)))
276
277
		    return c;
	if (client)
venaas's avatar
 
venaas committed
278
	    break;
279
280
281
282
283
284
285
286
	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) {
287
    struct sockaddr_in6 *sa6 = NULL;
288
289
290
291
292
293
294
295
296
297
298
299
300
301
    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
302
303
	if (s->peer.type == type)
	    for (res = s->peer.addrinfo; res; res = res->ai_next)
304
305
306
307
308
309
310
311
		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
312
313
314
315
    }
    return NULL;
}

316
/* exactly one of client and server must be non-NULL */
venaas's avatar
 
venaas committed
317
318
/* if *peer == NULL we return who we received from, else require it to be from peer */
/* return from in sa if not NULL */
319
unsigned char *radudpget(int s, struct client **client, struct server **server, struct sockaddr_storage *sa) {
venaas's avatar
 
venaas committed
320
    int cnt, len;
321
    void *f;
venaas's avatar
 
venaas committed
322
323
324
325
326
327
328
    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) {
329
	    debug(DBG_WARN, "radudpget: recv failed");
venaas's avatar
 
venaas committed
330
331
	    continue;
	}
venaas's avatar
venaas committed
332
	debug(DBG_DBG, "radudpget: got %d bytes from %s", cnt, addr2string((struct sockaddr *)&from, fromlen));
venaas's avatar
 
venaas committed
333
334

	if (cnt < 20) {
335
	    debug(DBG_WARN, "radudpget: packet too small");
venaas's avatar
 
venaas committed
336
337
338
339
	    continue;
	}
    
	len = RADLEN(buf);
340
341
342
343
	if (len < 20) {
	    debug(DBG_WARN, "radudpget: length too small");
	    continue;
	}
venaas's avatar
 
venaas committed
344
345

	if (cnt < len) {
346
	    debug(DBG_WARN, "radudpget: packet smaller than length field in radius header");
venaas's avatar
 
venaas committed
347
348
349
	    continue;
	}
	if (cnt > len)
venaas's avatar
venaas committed
350
	    debug(DBG_DBG, "radudpget: packet was padded with %d bytes", cnt - len);
venaas's avatar
 
venaas committed
351

352
353
354
	f = (client
	     ? (void *)find_client('U', (struct sockaddr *)&from, *client)
	     : (void *)find_server('U', (struct sockaddr *)&from, *server));
venaas's avatar
 
venaas committed
355
	if (!f) {
356
	    debug(DBG_WARN, "radudpget: got packet from wrong or unknown UDP peer, ignoring");
venaas's avatar
 
venaas committed
357
358
359
360
361
362
	    continue;
	}

	rad = malloc(len);
	if (rad)
	    break;
363
	debug(DBG_ERR, "radudpget: malloc failed");
venaas's avatar
 
venaas committed
364
365
    }
    memcpy(rad, buf, len);
366
367
368
369
    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
370
371
372
373
374
    if (sa)
	*sa = from;
    return rad;
}

375
int tlsverifycert(struct peer *peer) {
376
    int l, loc;
377
378
379
380
381
382
383
    X509 *cert;
    X509_NAME *nm;
    X509_NAME_ENTRY *e;
    unsigned char *v;
    unsigned long error;

    if (SSL_get_verify_result(peer->ssl) != X509_V_OK) {
384
	debug(DBG_ERR, "tlsverifycert: basic validation failed");
385
	while ((error = ERR_get_error()))
386
	    debug(DBG_ERR, "tlsverifycert: TLS: %s", ERR_error_string(error, NULL));
387
388
	return 0;
    }
389

390
391
    cert = SSL_get_peer_certificate(peer->ssl);
    if (!cert) {
392
	debug(DBG_ERR, "tlsverifycert: failed to obtain certificate");
393
394
395
396
397
398
399
400
401
402
403
404
	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;
405
406
407
408
409
410
411
412
413
#ifdef DEBUG
	{
	    int i;
	    printf("cn: ");
	    for (i = 0; i < l; i++)
		printf("%c", v[i]);
	    printf("\n");
	}
#endif	
venaas's avatar
venaas committed
414
	if (l == strlen(peer->host) && !strncasecmp(peer->host, (char *)v, l)) {
venaas's avatar
venaas committed
415
	    debug(DBG_DBG, "tlsverifycert: Found cn matching host %s, All OK", peer->host);
416
417
	    return 1;
	}
418
	debug(DBG_ERR, "tlsverifycert: cn not matching host %s", peer->host);
419
420
421
422
423
    }
    X509_free(cert);
    return 0;
}

424
void tlsconnect(struct server *server, struct timeval *when, char *text) {
venaas's avatar
venaas committed
425
426
    struct timeval now;
    time_t elapsed;
venaas's avatar
venaas committed
427

venaas's avatar
venaas committed
428
    debug(DBG_DBG, "tlsconnect called from %s", text);
429
430
    pthread_mutex_lock(&server->lock);
    if (when && memcmp(&server->lastconnecttry, when, sizeof(struct timeval))) {
venaas's avatar
 
venaas committed
431
	/* already reconnected, nothing to do */
venaas's avatar
venaas committed
432
	debug(DBG_DBG, "tlsconnect(%s): seems already reconnected", text);
433
	pthread_mutex_unlock(&server->lock);
venaas's avatar
 
venaas committed
434
435
436
	return;
    }

venaas's avatar
venaas committed
437
    debug(DBG_DBG, "tlsconnect %s", text);
venaas's avatar
venaas committed
438

venaas's avatar
 
venaas committed
439
    for (;;) {
venaas's avatar
venaas committed
440
	gettimeofday(&now, NULL);
441
442
443
	elapsed = now.tv_sec - server->lastconnecttry.tv_sec;
	if (server->connectionok) {
	    server->connectionok = 0;
venaas's avatar
venaas committed
444
445
446
	    sleep(10);
	} else if (elapsed < 5)
	    sleep(10);
venaas's avatar
venaas committed
447
	else if (elapsed < 300) {
venaas's avatar
venaas committed
448
	    debug(DBG_INFO, "tlsconnect: sleeping %lds", elapsed);
venaas's avatar
venaas committed
449
	    sleep(elapsed);
venaas's avatar
venaas committed
450
451
452
	} else if (elapsed < 100000) {
	    debug(DBG_INFO, "tlsconnect: sleeping %ds", 600);
	    sleep(600);
venaas's avatar
venaas committed
453
	} else
venaas's avatar
venaas committed
454
	    server->lastconnecttry.tv_sec = now.tv_sec;  /* no sleep at startup */
455
	debug(DBG_WARN, "tlsconnect: trying to open TLS connection to %s port %s", server->peer.host, server->peer.port);
456
457
	if (server->sock >= 0)
	    close(server->sock);
458
459
	if ((server->sock = connecttoserver(server->peer.addrinfo)) < 0) {
	    debug(DBG_ERR, "tlsconnect: connecttoserver failed");
venaas's avatar
venaas committed
460
	    continue;
461
462
	}
	
venaas's avatar
venaas committed
463
	SSL_free(server->peer.ssl);
464
	server->peer.ssl = SSL_new(ssl_ctx);
venaas's avatar
venaas committed
465
	SSL_set_fd(server->peer.ssl, server->sock);
466
	if (SSL_connect(server->peer.ssl) > 0 && tlsverifycert(&server->peer))
venaas's avatar
 
venaas committed
467
468
	    break;
    }
469
    debug(DBG_WARN, "tlsconnect: TLS connection to %s port %s up", server->peer.host, server->peer.port);
venaas's avatar
venaas committed
470
    gettimeofday(&server->lastconnecttry, NULL);
471
    pthread_mutex_unlock(&server->lock);
venaas's avatar
 
venaas committed
472
473
474
475
476
477
478
479
480
481
}

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) {
482
		debug(DBG_ERR, "radtlsget: connection lost");
483
		if (SSL_get_error(ssl, cnt) == SSL_ERROR_ZERO_RETURN) {
venaas's avatar
venaas committed
484
		    /* remote end sent close_notify, send one back */
485
486
		    SSL_shutdown(ssl);
		}
venaas's avatar
 
venaas committed
487
488
489
490
491
492
493
		return NULL;
	    }
	}

	len = RADLEN(buf);
	rad = malloc(len);
	if (!rad) {
494
	    debug(DBG_ERR, "radtlsget: malloc failed");
venaas's avatar
 
venaas committed
495
496
497
498
499
500
501
	    continue;
	}
	memcpy(rad, buf, 4);

	for (; total < len; total += cnt) {
	    cnt = SSL_read(ssl, rad + total, len - total);
	    if (cnt <= 0) {
502
		debug(DBG_ERR, "radtlsget: connection lost");
503
		if (SSL_get_error(ssl, cnt) == SSL_ERROR_ZERO_RETURN) {
venaas's avatar
venaas committed
504
		    /* remote end sent close_notify, send one back */
505
506
		    SSL_shutdown(ssl);
		}
venaas's avatar
 
venaas committed
507
508
509
510
511
512
513
514
515
		free(rad);
		return NULL;
	    }
	}
    
	if (total >= 20)
	    break;
	
	free(rad);
516
	debug(DBG_WARN, "radtlsget: packet smaller than minimum radius size");
venaas's avatar
 
venaas committed
517
518
    }
    
venaas's avatar
venaas committed
519
    debug(DBG_DBG, "radtlsget: got %d bytes", total);
venaas's avatar
 
venaas committed
520
521
522
    return rad;
}

523
int clientradput(struct server *server, unsigned char *rad) {
venaas's avatar
venaas committed
524
    int cnt;
venaas's avatar
 
venaas committed
525
526
    size_t len;
    unsigned long error;
venaas's avatar
venaas committed
527
528
    struct timeval lastconnecttry;
    
venaas's avatar
 
venaas committed
529
    len = RADLEN(rad);
venaas's avatar
venaas committed
530
    if (server->peer.type == 'U') {
531
	if (send(server->sock, rad, len, 0) >= 0) {
venaas's avatar
venaas committed
532
	    debug(DBG_DBG, "clienradput: sent UDP of length %d to %s port %s", len, server->peer.host, server->peer.port);
venaas's avatar
 
venaas committed
533
534
	    return 1;
	}
535
	debug(DBG_WARN, "clientradput: send failed");
venaas's avatar
 
venaas committed
536
537
538
	return 0;
    }

539
    lastconnecttry = server->lastconnecttry;
venaas's avatar
venaas committed
540
    while ((cnt = SSL_write(server->peer.ssl, rad, len)) <= 0) {
venaas's avatar
 
venaas committed
541
	while ((error = ERR_get_error()))
542
	    debug(DBG_ERR, "clientradput: TLS: %s", ERR_error_string(error, NULL));
543
544
	tlsconnect(server, &lastconnecttry, "clientradput");
	lastconnecttry = server->lastconnecttry;
venaas's avatar
 
venaas committed
545
    }
venaas's avatar
venaas committed
546

547
    server->connectionok = 1;
venaas's avatar
venaas committed
548
    debug(DBG_DBG, "clientradput: Sent %d bytes, Radius packet of length %d to TLS peer %s",
venaas's avatar
venaas committed
549
	   cnt, len, server->peer.host);
venaas's avatar
 
venaas committed
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
    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
568
	EVP_DigestUpdate(&mdctx, sec, strlen((char *)sec)) &&
venaas's avatar
 
venaas committed
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
	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
595
	      EVP_DigestUpdate(&mdctx, sec, strlen((char *)sec)) &&
venaas's avatar
 
venaas committed
596
597
598
599
600
601
602
	      EVP_DigestFinal_ex(&mdctx, hash, &len) &&
	      len == 16 &&
	      !memcmp(hash, rad + 4, 16));
    pthread_mutex_unlock(&lock);
    return result;
}
	      
venaas's avatar
venaas committed
603
int checkmessageauth(unsigned char *rad, uint8_t *authattr, char *secret) {
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
    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
622
    memcpy(authattr, auth, 16);
623
    if (md_len != 16) {
624
	debug(DBG_WARN, "message auth computation failed");
625
626
627
628
629
	pthread_mutex_unlock(&lock);
	return 0;
    }

    if (memcmp(auth, hash, 16)) {
630
	debug(DBG_WARN, "message authenticator, wrong value");
631
632
633
634
635
636
637
638
	pthread_mutex_unlock(&lock);
	return 0;
    }	
	
    pthread_mutex_unlock(&lock);
    return 1;
}

venaas's avatar
venaas committed
639
int createmessageauth(unsigned char *rad, unsigned char *authattrval, char *secret) {
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
    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) {
660
	debug(DBG_WARN, "message auth computation failed");
661
662
663
664
665
666
667
668
	pthread_mutex_unlock(&lock);
	return 0;
    }

    pthread_mutex_unlock(&lock);
    return 1;
}

669
unsigned char *attrget(unsigned char *attrs, int length, uint8_t type) {
670
    while (length > 1) {
venaas's avatar
venaas committed
671
	if (ATTRTYPE(attrs) == type)
672
	    return attrs;
venaas's avatar
venaas committed
673
674
	length -= ATTRLEN(attrs);
	attrs += ATTRLEN(attrs);
675
676
677
678
    }
    return NULL;
}

venaas's avatar
venaas committed
679
void sendrq(struct server *to, struct request *rq) {
venaas's avatar
 
venaas committed
680
    int i;
681
    uint8_t *attr;
682

venaas's avatar
 
venaas committed
683
    pthread_mutex_lock(&to->newrq_mutex);
venaas's avatar
venaas committed
684
685
    /* might simplify if only try nextid, might be ok */
    for (i = to->nextid; i < MAX_REQUESTS; i++)
venaas's avatar
 
venaas committed
686
687
688
	if (!to->requests[i].buf)
	    break;
    if (i == MAX_REQUESTS) {
venaas's avatar
venaas committed
689
690
691
692
	for (i = 0; i < to->nextid; i++)
	    if (!to->requests[i].buf)
		break;
	if (i == to->nextid) {
693
	    debug(DBG_WARN, "No room in queue, dropping request");
694
	    free(rq->buf);
venaas's avatar
venaas committed
695
696
697
	    pthread_mutex_unlock(&to->newrq_mutex);
	    return;
	}
venaas's avatar
 
venaas committed
698
    }
venaas's avatar
venaas committed
699
    
venaas's avatar
 
venaas committed
700
    rq->buf[1] = (char)i;
701

702
    attr = attrget(rq->buf + 20, RADLEN(rq->buf) - 20, RAD_Attr_Message_Authenticator);
703
704
705
    if (attr && !createmessageauth(rq->buf, ATTRVAL(attr), to->peer.secret)) {
	free(rq->buf);
	pthread_mutex_unlock(&to->newrq_mutex);
706
	return;
707
    }
venaas's avatar
venaas committed
708

709
    debug(DBG_DBG, "sendrq: inserting packet with id %d in queue for %s", i, to->peer.host);
venaas's avatar
 
venaas committed
710
    to->requests[i] = *rq;
711
    to->nextid = i + 1;
venaas's avatar
 
venaas committed
712
713
714

    if (!to->newrq) {
	to->newrq = 1;
venaas's avatar
venaas committed
715
	debug(DBG_DBG, "signalling client writer");
venaas's avatar
 
venaas committed
716
717
718
719
720
	pthread_cond_signal(&to->newrq_cond);
    }
    pthread_mutex_unlock(&to->newrq_mutex);
}

venaas's avatar
venaas committed
721
void sendreply(struct client *to, unsigned char *buf, struct sockaddr_storage *tosa) {
venaas's avatar
 
venaas committed
722
723
    struct replyq *replyq = to->replyq;
    
venaas's avatar
venaas committed
724
725
726
727
728
729
    if (!radsign(buf, (unsigned char *)to->peer.secret)) {
	free(buf);
	debug(DBG_WARN, "sendreply: failed to sign message");
	return;
    }
	
venaas's avatar
 
venaas committed
730
731
    pthread_mutex_lock(&replyq->count_mutex);
    if (replyq->count == replyq->size) {
732
	debug(DBG_WARN, "No room in queue, dropping request");
venaas's avatar
 
venaas committed
733
	pthread_mutex_unlock(&replyq->count_mutex);
734
	free(buf);
venaas's avatar
 
venaas committed
735
736
737
738
739
740
741
742
743
	return;
    }

    replyq->replies[replyq->count].buf = buf;
    if (tosa)
	replyq->replies[replyq->count].tosa = *tosa;
    replyq->count++;

    if (replyq->count == 1) {
744
	debug(DBG_DBG, "signalling server writer");
venaas's avatar
 
venaas committed
745
746
747
748
749
	pthread_cond_signal(&replyq->count_cond);
    }
    pthread_mutex_unlock(&replyq->count_mutex);
}

venaas's avatar
venaas committed
750
int pwdencrypt(uint8_t *in, uint8_t len, char *shared, uint8_t sharedlen, uint8_t *auth) {
venaas's avatar
venaas committed
751
752
753
754
755
    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
756
    uint8_t i, offset = 0, out[128];
venaas's avatar
venaas committed
757
758
759
760
761
762
763
764
765
766
    
    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
767
	    !EVP_DigestUpdate(&mdctx, (uint8_t *)shared, sharedlen) ||
venaas's avatar
venaas committed
768
769
770
771
772
773
774
775
776
777
778
779
780
	    !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
781
    memcpy(in, out, len);
venaas's avatar
venaas committed
782
783
784
785
    pthread_mutex_unlock(&lock);
    return 1;
}

venaas's avatar
venaas committed
786
int pwddecrypt(uint8_t *in, uint8_t len, char *shared, uint8_t sharedlen, uint8_t *auth) {
venaas's avatar
 
venaas committed
787
788
789
790
791
    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
792
    uint8_t i, offset = 0, out[128];
venaas's avatar
 
venaas committed
793
794
795
796
797
798
799
800
801
802
    
    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
803
	    !EVP_DigestUpdate(&mdctx, (uint8_t *)shared, sharedlen) ||
venaas's avatar
 
venaas committed
804
805
806
807
808
809
810
	    !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
811
812
	    out[offset + i] = hash[i] ^ in[offset + i];
	input = in + offset;
venaas's avatar
 
venaas committed
813
	offset += 16;
venaas's avatar
venaas committed
814
	if (offset == len)
venaas's avatar
 
venaas committed
815
816
	    break;
    }
venaas's avatar
venaas committed
817
    memcpy(in, out, len);
venaas's avatar
 
venaas committed
818
819
820
821
    pthread_mutex_unlock(&lock);
    return 1;
}

venaas's avatar
venaas committed
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
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
873
#if 0	
venaas's avatar
venaas committed
874
875
876
877
	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
878
#endif
venaas's avatar
venaas committed
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
961
962
963
964
965
966
967
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
	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;
}

998
int id2server(struct server **server, char *id, uint8_t len) {
999
    int i;
venaas's avatar
venaas committed
1000
    for (i = 0; i < realm_count; i++)