radsecproxy.c 101 KB
Newer Older
venaas's avatar
 
venaas committed
1
/*
2
 * Copyright (C) 2006-2008 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
/* Bugs:
33
 * TCP accounting not yet supported
venaas's avatar
venaas committed
34
35
36
 * We are not removing client requests from dynamic servers, see removeclientrqs()
 */

venaas's avatar
venaas committed
37
#include <signal.h>
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 <limits.h>
venaas's avatar
venaas committed
44
45
46
#ifdef SYS_SOLARIS9
#include <fcntl.h>
#endif
venaas's avatar
venaas committed
47
#include <sys/time.h>
48
#include <sys/types.h>
49
#include <sys/select.h>
50
#include <ctype.h>
51
#include <sys/wait.h>
52
#include <arpa/inet.h>
venaas's avatar
venaas committed
53
#include <regex.h>
venaas's avatar
venaas committed
54
#include <libgen.h>
venaas's avatar
 
venaas committed
55
56
57
58
59
#include <pthread.h>
#include <openssl/ssl.h>
#include <openssl/rand.h>
#include <openssl/err.h>
#include <openssl/md5.h>
venaas's avatar
venaas committed
60
#include <openssl/hmac.h>
61
#include <openssl/x509v3.h>
venaas's avatar
venaas committed
62
#include "debug.h"
venaas's avatar
venaas committed
63
#include "list.h"
64
65
#include "util.h"
#include "gconfig.h"
venaas's avatar
venaas committed
66
#include "radsecproxy.h"
venaas's avatar
venaas committed
67
#include "udp.h"
venaas's avatar
venaas committed
68
69
#include "tcp.h"
#include "tls.h"
venaas's avatar
venaas committed
70
#include "dtls.h"
venaas's avatar
 
venaas committed
71

72
static struct options options;
venaas's avatar
venaas committed
73
74
static struct list *clconfs, *srvconfs;
struct list *realms, *tlsconfs, *rewriteconfs;
75

76
static struct addrinfo *srcprotores[4] = { NULL, NULL, NULL, NULL };
77

78
static struct queue *udp_server_replyq = NULL;
79
80
static int udp_client4_sock = -1;
static int udp_client6_sock = -1;
81
82
static int dtls_client4_sock = -1;
static int dtls_client6_sock = -1;
venaas's avatar
venaas committed
83
84
static pthread_mutex_t tlsconfs_lock;
static pthread_mutex_t *ssl_locks = NULL;
venaas's avatar
 
venaas committed
85
86
87
88
static long *ssl_lock_count;
extern int optind;
extern char *optarg;

venaas's avatar
venaas committed
89
90
/* minimum required declarations to avoid reordering code */
void adddynamicrealmserver(struct realm *realm, struct clsrvconf *conf, char *id);
91
int dynamicconfig(struct server *server);
92
int confserver_cb(struct gconffile **cf, void *arg, char *block, char *opt, char *val);
93
94
void freerealm(struct realm *realm);
void freeclsrvconf(struct clsrvconf *conf);
95
void freerqdata(struct request *rq);
96

97
static const struct protodefs protodefs[] = {
venaas's avatar
venaas committed
98
99
    {   "udp", /* UDP, assuming RAD_UDP defined as 0 */
	NULL, /* secretdefault */
venaas's avatar
venaas committed
100
101
	SOCK_DGRAM, /* socktype */
	"1812", /* portdefault */
102
103
104
	REQUEST_RETRY_COUNT, /* retrycountdefault */
	10, /* retrycountmax */
	REQUEST_RETRY_INTERVAL, /* retryintervaldefault */
105
	60, /* retryintervalmax */
venaas's avatar
venaas committed
106
107
108
109
110
	udpserverrd, /* listener */
	&options.sourceudp, /* srcaddrport */
	NULL, /* connecter */
	udpclientrd, /* clientreader */
	clientradputudp /* clientradput */
111
    },
venaas's avatar
venaas committed
112
113
    {   "tls", /* TLS, assuming RAD_TLS defined as 1 */
	"mysecret", /* secretdefault */
venaas's avatar
venaas committed
114
115
	SOCK_STREAM, /* socktype */
	"2083", /* portdefault */
venaas's avatar
venaas committed
116
117
118
	0, /* retrycountdefault */
	0, /* retrycountmax */
	REQUEST_RETRY_INTERVAL * REQUEST_RETRY_COUNT, /* retryintervaldefault */
119
	60, /* retryintervalmax */
venaas's avatar
venaas committed
120
121
122
123
124
	tlslistener, /* listener */
	&options.sourcetls, /* srcaddrport */
	tlsconnect, /* connecter */
	tlsclientrd, /* clientreader */
	clientradputtls /* clientradput */
venaas's avatar
venaas committed
125
126
127
    },
    {   "tcp", /* TCP, assuming RAD_TCP defined as 2 */
	NULL, /* secretdefault */
venaas's avatar
venaas committed
128
129
	SOCK_STREAM, /* socktype */
	"1812", /* portdefault */
130
131
132
	0, /* retrycountdefault */
	0, /* retrycountmax */
	REQUEST_RETRY_INTERVAL * REQUEST_RETRY_COUNT, /* retryintervaldefault */
133
	60, /* retryintervalmax */
venaas's avatar
venaas committed
134
135
136
137
138
	tcplistener, /* listener */
	&options.sourcetcp, /* srcaddrport */
	tcpconnect, /* connecter */
	tcpclientrd, /* clientreader */
	clientradputtcp /* clientradput */
venaas's avatar
venaas committed
139
    },
venaas's avatar
venaas committed
140
    {   "dtls", /* DTLS, assuming RAD_DTLS defined as 3 */
141
	"mysecret", /* secretdefault */
venaas's avatar
venaas committed
142
	SOCK_DGRAM, /* socktype */
143
	"2083", /* portdefault */
venaas's avatar
venaas committed
144
145
146
147
	REQUEST_RETRY_COUNT, /* retrycountdefault */
	10, /* retrycountmax */
	REQUEST_RETRY_INTERVAL, /* retryintervaldefault */
	60, /* retryintervalmax */
148
149
	udpdtlsserverrd, /* listener */
	&options.sourcedtls, /* srcaddrport */
150
	dtlsconnect, /* connecter */
151
152
	dtlsclientrd, /* clientreader */
	clientradputdtls /* clientradput */
venaas's avatar
venaas committed
153
    },
venaas's avatar
venaas committed
154
    {   NULL
155
156
157
    }
};

venaas's avatar
venaas committed
158
159
160
161
162
163
164
uint8_t protoname2int(const char *name) {
    int i;

    for (i = 0; protodefs[i].name && strcasecmp(protodefs[i].name, name); i++);
    return i;
}
    
venaas's avatar
 
venaas committed
165
166
167
/* callbacks for making OpenSSL thread safe */
unsigned long ssl_thread_id() {
        return (unsigned long)pthread_self();
venaas's avatar
venaas committed
168
}
venaas's avatar
 
venaas committed
169
170
171
172
173
174
175
176
177

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
178
179
180
181
182
183
184
185
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;
}

186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
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);
203
      debug(DBG_WARN, "verify error: num=%d:%s:depth=%d:%s", err, X509_verify_cert_error_string(err), depth, buf);
204
205
206
207

      switch (err) {
      case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
	  X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), buf, 256);
208
	  debug(DBG_WARN, "\tIssuer=%s", buf);
209
210
211
	  break;
      case X509_V_ERR_CERT_NOT_YET_VALID:
      case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
212
	  debug(DBG_WARN, "\tCertificate not yet valid");
213
214
	  break;
      case X509_V_ERR_CERT_HAS_EXPIRED:
215
	  debug(DBG_WARN, "Certificate has expired");
216
217
	  break;
      case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
218
	  debug(DBG_WARN, "Certificate no longer valid (after notAfter)");
219
220
221
	  break;
      }
  }
222
223
224
#ifdef DEBUG  
  printf("certificate verify returns %d\n", ok);
#endif  
225
226
227
  return ok;
}

venaas's avatar
venaas committed
228
229
230
231
struct addrinfo *getsrcprotores(uint8_t type) {
    return srcprotores[type];
}

venaas's avatar
venaas committed
232
int resolvepeer(struct clsrvconf *conf, int ai_flags) {
233
    struct addrinfo hints, *addrinfo, *res;
234
    char *slash, *s;
venaas's avatar
venaas committed
235
    int plen = 0;
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255

    slash = conf->host ? strchr(conf->host, '/') : NULL;
    if (slash) {
	s = slash + 1;
	if (!*s) {
	    debug(DBG_WARN, "resolvepeer: prefix length must be specified after the / in %s", conf->host);
	    return 0;
	}
	for (; *s; s++)
	    if (*s < '0' || *s > '9') {
		debug(DBG_WARN, "resolvepeer: %s in %s is not a valid prefix length", slash + 1, conf->host);
		return 0;
	    }
	plen = atoi(slash + 1);
	if (plen < 0 || plen > 128) {
	    debug(DBG_WARN, "resolvepeer: %s in %s is not a valid prefix length", slash + 1, conf->host);
	    return 0;
	}
	*slash = '\0';
    }
venaas's avatar
 
venaas committed
256
    memset(&hints, 0, sizeof(hints));
venaas's avatar
venaas committed
257
    hints.ai_socktype = conf->pdef->socktype;
venaas's avatar
 
venaas committed
258
    hints.ai_family = AF_UNSPEC;
venaas's avatar
venaas committed
259
    hints.ai_flags = ai_flags;
260
261
    if (!conf->host && !conf->port) {
	/* getaddrinfo() doesn't like host and port to be NULL */
venaas's avatar
venaas committed
262
	if (getaddrinfo(conf->host, conf->pdef->portdefault, &hints, &addrinfo)) {
263
264
265
266
267
268
269
270
271
272
273
	    debug(DBG_WARN, "resolvepeer: can't resolve (null) port (null)");
	    return 0;
	}
	for (res = addrinfo; res; res = res->ai_next) {
	    switch (res->ai_family) {
	    case AF_INET:
		((struct sockaddr_in *)res->ai_addr)->sin_port = 0;
		break;
	    case AF_INET6:
		((struct sockaddr_in6 *)res->ai_addr)->sin6_port = 0;
		break;
274
	    }
275
276
277
278
279
	}
    } else {
	if (slash)
	    hints.ai_flags |= AI_NUMERICHOST;
	if (getaddrinfo(conf->host, conf->port, &hints, &addrinfo)) {
280
	    debug(DBG_WARN, "resolvepeer: can't resolve %s port %s", conf->host ? conf->host : "(null)", conf->port ? conf->port : "(null)");
281
282
	    return 0;
	}
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
	if (slash) {
	    *slash = '/';
	    switch (addrinfo->ai_family) {
	    case AF_INET:
		if (plen > 32) {
		    debug(DBG_WARN, "resolvepeer: prefix length must be <= 32 in %s", conf->host);
		    freeaddrinfo(addrinfo);
		    return 0;
		}
		break;
	    case AF_INET6:
		break;
	    default:
		debug(DBG_WARN, "resolvepeer: prefix must be IPv4 or IPv6 in %s", conf->host);
		freeaddrinfo(addrinfo);
		return 0;
	    }
	    conf->prefixlen = plen;
	} else
	    conf->prefixlen = 255;
    }
venaas's avatar
venaas committed
304
305
306
    if (conf->addrinfo)
	freeaddrinfo(conf->addrinfo);
    conf->addrinfo = addrinfo;
venaas's avatar
 
venaas committed
307
308
309
    return 1;
}	  

310
311
int bindtoaddr(struct addrinfo *addrinfo, int family, int reuse, int v6only) {
    int s, on = 1;
venaas's avatar
 
venaas committed
312
    struct addrinfo *res;
313
    
314
    for (res = addrinfo; res; res = res->ai_next) {
315
316
	if (family != AF_UNSPEC && family != res->ai_family)
	    continue;
venaas's avatar
 
venaas committed
317
318
        s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
        if (s < 0) {
319
            debug(DBG_WARN, "bindtoaddr: socket failed");
venaas's avatar
 
venaas committed
320
321
            continue;
        }
322
323
324
325
326
327
328
329
330
331
	if (reuse)
	    setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
#ifdef IPV6_V6ONLY
	if (v6only)
	    setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on));
#endif		

	if (!bind(s, res->ai_addr, res->ai_addrlen))
	    return s;
	debug(DBG_WARN, "bindtoaddr: bind failed");
venaas's avatar
 
venaas committed
332
333
        close(s);
    }
334
    return -1;
venaas's avatar
 
venaas committed
335
336
}	  

337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
char *parsehostport(char *s, struct clsrvconf *conf, char *default_port) {
    char *p, *field;
    int ipv6 = 0;

    p = s;
    /* allow literal addresses and port, e.g. [2001:db8::1]:1812 */
    if (*p == '[') {
	p++;
	field = p;
	for (; *p && *p != ']' && *p != ' ' && *p != '\t' && *p != '\n'; p++);
	if (*p != ']')
	    debugx(1, DBG_ERR, "no ] matching initial [");
	ipv6 = 1;
    } else {
	field = p;
	for (; *p && *p != ':' && *p != ' ' && *p != '\t' && *p != '\n'; p++);
    }
    if (field == p)
	debugx(1, DBG_ERR, "missing host/address");

    conf->host = stringcopy(field, p - field);
    if (ipv6) {
	p++;
	if (*p && *p != ':' && *p != ' ' && *p != '\t' && *p != '\n')
	    debugx(1, DBG_ERR, "unexpected character after ]");
    }
    if (*p == ':') {
	    /* port number or service name is specified */;
	    field = ++p;
	    for (; *p && *p != ' ' && *p != '\t' && *p != '\n'; p++);
	    if (field == p)
		debugx(1, DBG_ERR, "syntax error, : but no following port");
	    conf->port = stringcopy(field, p - field);
    } else
	conf->port = default_port ? stringcopy(default_port, 0) : NULL;
    return p;
}

venaas's avatar
venaas committed
375
struct clsrvconf *resolve_hostport(uint8_t type, char *lconf, char *default_port) {
376
377
378
379
380
381
382
    struct clsrvconf *conf;

    conf = malloc(sizeof(struct clsrvconf));
    if (!conf)
	debugx(1, DBG_ERR, "malloc failed");
    memset(conf, 0, sizeof(struct clsrvconf));
    conf->type = type;
venaas's avatar
venaas committed
383
    conf->pdef = &protodefs[conf->type];
384
385
386
387
388
389
390
391
392
    if (lconf) {
	parsehostport(lconf, conf, default_port);
	if (!strcmp(conf->host, "*")) {
	    free(conf->host);
	    conf->host = NULL;
	}
    } else
	conf->port = default_port ? stringcopy(default_port, 0) : NULL;
    if (!resolvepeer(conf, AI_PASSIVE))
393
	debugx(1, DBG_ERR, "failed to resolve host %s port %s, exiting", conf->host ? conf->host : "(null)", conf->port ? conf->port : "(null)");
394
395
396
    return conf;
}

397
398
399
400
401
402
403
404
void freeclsrvres(struct clsrvconf *res) {
    free(res->host);
    free(res->port);
    if (res->addrinfo)
	freeaddrinfo(res->addrinfo);
    free(res);
}

venaas's avatar
venaas committed
405
int connecttcp(struct addrinfo *addrinfo, struct addrinfo *src) {
406
    int s;
venaas's avatar
venaas committed
407
    struct addrinfo *res;
408
409

    s = -1;
venaas's avatar
venaas committed
410
    for (res = addrinfo; res; res = res->ai_next) {
venaas's avatar
venaas committed
411
	s = bindtoaddr(src, res->ai_family, 1, 1);
venaas's avatar
venaas committed
412
        if (s < 0) {
413
            debug(DBG_WARN, "connecttoserver: socket failed");
venaas's avatar
venaas committed
414
415
            continue;
        }
416
417
418
        if (connect(s, res->ai_addr, res->ai_addrlen) == 0)
            break;
        debug(DBG_WARN, "connecttoserver: connect failed");
venaas's avatar
venaas committed
419
        close(s);
420
        s = -1;
venaas's avatar
venaas committed
421
    }
422
    return s;
venaas's avatar
venaas committed
423
424
}	  

425
426
427
428
429
430
431
432
433
434
435
436
/* returns 1 if the len first bits are equal, else 0 */
int prefixmatch(void *a1, void *a2, uint8_t len) {
    static uint8_t mask[] = { 0, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe };
    int r, l = len / 8;
    if (l && memcmp(a1, a2, l))
	return 0;
    r = len % 8;
    if (!r)
	return 1;
    return (((uint8_t *)a1)[l] & mask[r]) == (((uint8_t *)a2)[l] & mask[r]);
}

437
/* returns next config with matching address, or NULL */
venaas's avatar
venaas committed
438
struct clsrvconf *find_conf(uint8_t type, struct sockaddr *addr, struct list *confs, struct list_node **cur) {
439
440
441
442
443
444
445
446
447
448
449
450
451
452
    struct sockaddr_in6 *sa6 = NULL;
    struct in_addr *a4 = NULL;
    struct addrinfo *res;
    struct list_node *entry;
    struct clsrvconf *conf;
    
    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];
	    sa6 = NULL;
	}
    } else
	a4 = &((struct sockaddr_in *)addr)->sin_addr;
venaas's avatar
venaas committed
453

venaas's avatar
venaas committed
454
    for (entry = (cur && *cur ? list_next(*cur) : list_first(confs)); entry; entry = list_next(entry)) {
venaas's avatar
venaas committed
455
	conf = (struct clsrvconf *)entry->data;
456
457
458
459
460
461
	if (conf->type == type) {
	    if (conf->prefixlen == 255) {
		for (res = conf->addrinfo; res; res = res->ai_next)
		    if ((a4 && res->ai_family == AF_INET &&
			 !memcmp(a4, &((struct sockaddr_in *)res->ai_addr)->sin_addr, 4)) ||
			(sa6 && res->ai_family == AF_INET6 &&
462
463
464
			 !memcmp(&sa6->sin6_addr, &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr, 16))) {
			if (cur)
			    *cur = entry;
465
			return conf;
466
		    }
467
468
469
470
471
472
	    } else {
		res = conf->addrinfo;
		if (res &&
		    ((a4 && res->ai_family == AF_INET &&
		      prefixmatch(a4, &((struct sockaddr_in *)res->ai_addr)->sin_addr, conf->prefixlen)) ||
		     (sa6 && res->ai_family == AF_INET6 &&
473
474
475
		      prefixmatch(&sa6->sin6_addr, &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr, conf->prefixlen)))) {
		    if (cur)
			*cur = entry;
venaas's avatar
venaas committed
476
		    return conf;
477
		}
478
479
	    }
	}
venaas's avatar
venaas committed
480
    }    
venaas's avatar
venaas committed
481
482
483
    return NULL;
}

venaas's avatar
venaas committed
484
485
486
487
488
489
490
491
struct clsrvconf *find_clconf(uint8_t type, struct sockaddr *addr, struct list_node **cur) {
    return find_conf(type, addr, clconfs, cur);
}

struct clsrvconf *find_srvconf(uint8_t type, struct sockaddr *addr, struct list_node **cur) {
    return find_conf(type, addr, srvconfs, cur);
}

venaas's avatar
venaas committed
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
/* returns next config of given type, or NULL */
struct clsrvconf *find_conf_type(uint8_t type, struct list *confs, struct list_node **cur) {
    struct list_node *entry;
    struct clsrvconf *conf;
    
    for (entry = (cur && *cur ? list_next(*cur) : list_first(confs)); entry; entry = list_next(entry)) {
	conf = (struct clsrvconf *)entry->data;
	if (conf->type == type) {
	    if (cur)
		*cur = entry;
	    return conf;
	}
    }    
    return NULL;
}

508
509
struct queue *newqueue() {
    struct queue *q;
510
    
511
512
    q = malloc(sizeof(struct queue));
    if (!q)
513
	debugx(1, DBG_ERR, "malloc failed");
514
515
    q->entries = list_create();
    if (!q->entries)
516
	debugx(1, DBG_ERR, "malloc failed");
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
    pthread_mutex_init(&q->mutex, NULL);
    pthread_cond_init(&q->cond, NULL);
    return q;
}

void removequeue(struct queue *q) {
    struct list_node *entry;
    
    pthread_mutex_lock(&q->mutex);
    for (entry = list_first(q->entries); entry; entry = list_next(entry))
	free(((struct reply *)entry)->buf);
    list_destroy(q->entries);
    pthread_cond_destroy(&q->cond);
    pthread_mutex_unlock(&q->mutex);
    pthread_mutex_destroy(&q->mutex);
}

void freebios(struct queue *q) {
    BIO *bio;
    
    pthread_mutex_lock(&q->mutex);
    while ((bio = (BIO *)list_shift(q->entries)))
	BIO_free(bio);
    pthread_mutex_unlock(&q->mutex);
    removequeue(q);
542
543
}

544
545
546
547
548
549
struct client *addclient(struct clsrvconf *conf) {
    struct client *new = malloc(sizeof(struct client));
    
    if (!new) {
	debug(DBG_ERR, "malloc failed");
	return NULL;
550
551
    }
    if (!conf->clients) {
552
553
554
555
556
	conf->clients = list_create();
	if (!conf->clients) {
	    debug(DBG_ERR, "malloc failed");
	    return NULL;
	}
557
    }
558
559
560
    
    memset(new, 0, sizeof(struct client));
    new->conf = conf;
561
562
563
    new->replyq = conf->type == RAD_UDP ? udp_server_replyq : newqueue();
    if (conf->type == RAD_DTLS)
	new->rbios = newqueue();
564
565
566
567
568
569
570
    list_push(conf->clients, new);
    return new;
}

void removeclient(struct client *client) {
    if (!client || !client->conf->clients)
	return;
571
572
573
    removequeue(client->replyq);
    if (client->rbios)
	freebios(client->rbios);
574
575
    list_removedata(client->conf->clients, client);
    free(client);
576
577
}

578
579
580
581
582
583
584
585
void removeclientrqs(struct client *client) {
    struct list_node *entry;
    struct server *server;
    struct request *rq;
    int i;
    
    for (entry = list_first(srvconfs); entry; entry = list_next(entry)) {
	server = ((struct clsrvconf *)entry->data)->servers;
586
587
	if (!server)
	    continue;
588
589
590
591
592
593
594
595
596
	pthread_mutex_lock(&server->newrq_mutex);
	for (i = 0; i < MAX_REQUESTS; i++) {
	    rq = server->requests + i;
	    if (rq->from == client)
		rq->from = NULL;
	}
	pthread_mutex_unlock(&server->newrq_mutex);
    }
}
venaas's avatar
venaas committed
597
598

void freeserver(struct server *server, uint8_t destroymutex) {
599
600
    struct request *rq, *end;

venaas's avatar
venaas committed
601
602
    if (!server)
	return;
603

604
    if (server->requests) {
605
606
607
608
609
	rq = server->requests;
	for (end = rq + MAX_REQUESTS; rq < end; rq++)
	    freerqdata(rq);
	free(server->requests);
    }
610
611
    if (server->rbios)
	freebios(server->rbios);
612
    free(server->dynamiclookuparg);
venaas's avatar
venaas committed
613
614
615
616
617
618
619
620
621
622
    if (destroymutex) {
	pthread_mutex_destroy(&server->lock);
	pthread_cond_destroy(&server->newrq_cond);
	pthread_mutex_destroy(&server->newrq_mutex);
    }
    free(server);
}

int addserver(struct clsrvconf *conf) {
    struct clsrvconf *res;
venaas's avatar
venaas committed
623
    uint8_t type;
624
    
venaas's avatar
venaas committed
625
626
627
628
    if (conf->servers) {
	debug(DBG_ERR, "addserver: currently works with just one server per conf");
	return 0;
    }
629
    conf->servers = malloc(sizeof(struct server));
venaas's avatar
venaas committed
630
631
632
633
    if (!conf->servers) {
	debug(DBG_ERR, "malloc failed");
	return 0;
    }
634
635
636
    memset(conf->servers, 0, sizeof(struct server));
    conf->servers->conf = conf;

venaas's avatar
venaas committed
637
    type = conf->type;
638
    if (type == RAD_DTLS)
639
	conf->servers->rbios = newqueue();
venaas's avatar
venaas committed
640
641
642
643
    
    if (!srcprotores[type]) {
	res = resolve_hostport(type, *conf->pdef->srcaddrport, NULL);
	srcprotores[type] = res->addrinfo;
venaas's avatar
venaas committed
644
645
646
647
	res->addrinfo = NULL;
	freeclsrvres(res);
    }

648
649
    switch (type) {
    case RAD_UDP:
650
651
652
	switch (conf->addrinfo->ai_family) {
	case AF_INET:
	    if (udp_client4_sock < 0) {
venaas's avatar
venaas committed
653
		udp_client4_sock = bindtoaddr(srcprotores[RAD_UDP], AF_INET, 0, 1);
654
655
656
657
		if (udp_client4_sock < 0)
		    debugx(1, DBG_ERR, "addserver: failed to create client socket for server %s", conf->host);
	    }
	    conf->servers->sock = udp_client4_sock;
658
	    break;
659
660
	case AF_INET6:
	    if (udp_client6_sock < 0) {
venaas's avatar
venaas committed
661
		udp_client6_sock = bindtoaddr(srcprotores[RAD_UDP], AF_INET6, 0, 1);
662
663
664
665
		if (udp_client6_sock < 0)
		    debugx(1, DBG_ERR, "addserver: failed to create client socket for server %s", conf->host);
	    }
	    conf->servers->sock = udp_client6_sock;
666
	    break;
667
668
669
	default:
	    debugx(1, DBG_ERR, "addserver: unsupported address family");
	}
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
	break;
    case RAD_DTLS:
	switch (conf->addrinfo->ai_family) {
	case AF_INET:
	    if (dtls_client4_sock < 0) {
		dtls_client4_sock = bindtoaddr(srcprotores[RAD_DTLS], AF_INET, 0, 1);
		if (dtls_client4_sock < 0)
		    debugx(1, DBG_ERR, "addserver: failed to create client socket for server %s", conf->host);
	    }
	    conf->servers->sock = dtls_client4_sock;
	    break;
	case AF_INET6:
	    if (dtls_client6_sock < 0) {
		dtls_client6_sock = bindtoaddr(srcprotores[RAD_DTLS], AF_INET6, 0, 1);
		if (dtls_client6_sock < 0)
		    debugx(1, DBG_ERR, "addserver: failed to create client socket for server %s", conf->host);
	    }
	    conf->servers->sock = dtls_client6_sock;
	    break;
	default:
	    debugx(1, DBG_ERR, "addserver: unsupported address family");
	}
	break;
    default:
694
	conf->servers->sock = -1;
695
    }
696
    
697
    conf->servers->requests = calloc(MAX_REQUESTS, sizeof(struct request));
venaas's avatar
venaas committed
698
699
700
701
702
703
704
705
    if (!conf->servers->requests) {
	debug(DBG_ERR, "malloc failed");
	goto errexit;
    }
    if (pthread_mutex_init(&conf->servers->lock, NULL)) {
	debug(DBG_ERR, "mutex init failed");
	goto errexit;
    }
706
    conf->servers->newrq = 0;
venaas's avatar
venaas committed
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
    if (pthread_mutex_init(&conf->servers->newrq_mutex, NULL)) {
	debug(DBG_ERR, "mutex init failed");
	pthread_mutex_destroy(&conf->servers->lock);
	goto errexit;
    }
    if (pthread_cond_init(&conf->servers->newrq_cond, NULL)) {
	debug(DBG_ERR, "mutex init failed");
	pthread_mutex_destroy(&conf->servers->newrq_mutex);
	pthread_mutex_destroy(&conf->servers->lock);
	goto errexit;
    }

    return 1;
    
 errexit:
    freeserver(conf->servers, 0);
    conf->servers = NULL;
    return 0;
725
726
}

727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
int subjectaltnameaddr(X509 *cert, int family, struct in6_addr *addr) {
    int loc, i, l, n, r = 0;
    char *v;
    X509_EXTENSION *ex;
    STACK_OF(GENERAL_NAME) *alt;
    GENERAL_NAME *gn;
    
    debug(DBG_DBG, "subjectaltnameaddr");
    
    loc = X509_get_ext_by_NID(cert, NID_subject_alt_name, -1);
    if (loc < 0)
	return r;
    
    ex = X509_get_ext(cert, loc);
    alt = X509V3_EXT_d2i(ex);
    if (!alt)
	return r;
    
    n = sk_GENERAL_NAME_num(alt);
    for (i = 0; i < n; i++) {
	gn = sk_GENERAL_NAME_value(alt, i);
	if (gn->type != GEN_IPADD)
	    continue;
	r = -1;
	v = (char *)ASN1_STRING_data(gn->d.ia5);
	l = ASN1_STRING_length(gn->d.ia5);
	if (((family == AF_INET && l == sizeof(struct in_addr)) || (family == AF_INET6 && l == sizeof(struct in6_addr)))
	    && !memcmp(v, &addr, l)) {
	    r = 1;
	    break;
	}
    }
    GENERAL_NAMES_free(alt);
    return r;
}

venaas's avatar
venaas committed
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
int cnregexp(X509 *cert, char *exact, regex_t *regex) {
    int loc, l;
    char *v, *s;
    X509_NAME *nm;
    X509_NAME_ENTRY *e;
    ASN1_STRING *t;

    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);
	t = X509_NAME_ENTRY_get_data(e);
	v = (char *) ASN1_STRING_data(t);
	l = ASN1_STRING_length(t);
	if (l < 0)
	    continue;
	if (exact) {
	    if (l == strlen(exact) && !strncasecmp(exact, v, l))
		return 1;
	} else {
	    s = stringcopy((char *)v, l);
	    if (!s) {
		debug(DBG_ERR, "malloc failed");
		continue;
	    }
	    if (regexec(regex, s, 0, NULL, 0)) {
		free(s);
		continue;
	    }
	    free(s);
	    return 1;
	}
    }
    return 0;
}

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
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
int subjectaltnameregexp(X509 *cert, int type, char *exact,  regex_t *regex) {
    int loc, i, l, n, r = 0;
    char *s, *v;
    X509_EXTENSION *ex;
    STACK_OF(GENERAL_NAME) *alt;
    GENERAL_NAME *gn;
    
    debug(DBG_DBG, "subjectaltnameregexp");
    
    loc = X509_get_ext_by_NID(cert, NID_subject_alt_name, -1);
    if (loc < 0)
	return r;
    
    ex = X509_get_ext(cert, loc);
    alt = X509V3_EXT_d2i(ex);
    if (!alt)
	return r;
    
    n = sk_GENERAL_NAME_num(alt);
    for (i = 0; i < n; i++) {
	gn = sk_GENERAL_NAME_value(alt, i);
	if (gn->type != type)
	    continue;
	r = -1;
	v = (char *)ASN1_STRING_data(gn->d.ia5);
	l = ASN1_STRING_length(gn->d.ia5);
	if (l <= 0)
	    continue;
#ifdef DEBUG
	printfchars(NULL, gn->type == GEN_DNS ? "dns" : "uri", NULL, v, l);
#endif	
	if (exact) {
	    if (memcmp(v, exact, l))
		continue;
	} else {
	    s = stringcopy((char *)v, l);
	    if (!s) {
		debug(DBG_ERR, "malloc failed");
		continue;
	    }
	    if (regexec(regex, s, 0, NULL, 0)) {
		free(s);
		continue;
	    }
	    free(s);
	}
	r = 1;
	break;
    }
    GENERAL_NAMES_free(alt);
    return r;
}

venaas's avatar
venaas committed
855
X509 *verifytlscert(SSL *ssl) {
856
857
    X509 *cert;
    unsigned long error;
858
    
venaas's avatar
venaas committed
859
    if (SSL_get_verify_result(ssl) != X509_V_OK) {
venaas's avatar
venaas committed
860
	debug(DBG_ERR, "verifytlscert: basic validation failed");
861
	while ((error = ERR_get_error()))
venaas's avatar
venaas committed
862
863
	    debug(DBG_ERR, "verifytlscert: TLS: %s", ERR_error_string(error, NULL));
	return NULL;
864
    }
865

venaas's avatar
venaas committed
866
    cert = SSL_get_peer_certificate(ssl);
venaas's avatar
venaas committed
867
868
869
870
871
872
873
874
875
876
    if (!cert)
	debug(DBG_ERR, "verifytlscert: failed to obtain certificate");
    return cert;
}
    
int verifyconfcert(X509 *cert, struct clsrvconf *conf) {
    int r;
    uint8_t type = 0; /* 0 for DNS, AF_INET for IPv4, AF_INET6 for IPv6 */
    struct in6_addr addr;
    
877
    if (conf->certnamecheck && conf->prefixlen == 255) {
878
879
880
881
882
883
884
885
	if (inet_pton(AF_INET, conf->host, &addr))
	    type = AF_INET;
	else if (inet_pton(AF_INET6, conf->host, &addr))
	    type = AF_INET6;

	r = type ? subjectaltnameaddr(cert, type, &addr) : subjectaltnameregexp(cert, GEN_DNS, conf->host, NULL);
	if (r) {
	    if (r < 0) {
venaas's avatar
venaas committed
886
		debug(DBG_WARN, "verifyconfcert: No subjectaltname matching %s %s", type ? "address" : "host", conf->host);
venaas's avatar
venaas committed
887
		return 0;
888
	    }
venaas's avatar
venaas committed
889
	    debug(DBG_DBG, "verifyconfcert: Found subjectaltname matching %s %s", type ? "address" : "host", conf->host);
890
	} else {
venaas's avatar
venaas committed
891
	    if (!cnregexp(cert, conf->host, NULL)) {
venaas's avatar
venaas committed
892
		debug(DBG_WARN, "verifyconfcert: cn not matching host %s", conf->host);
venaas's avatar
venaas committed
893
		return 0;
venaas's avatar
venaas committed
894
	    }		
venaas's avatar
venaas committed
895
	    debug(DBG_DBG, "verifyconfcert: Found cn matching host %s", conf->host);
venaas's avatar
venaas committed
896
897
898
899
	}
    }
    if (conf->certcnregex) {
	if (cnregexp(cert, NULL, conf->certcnregex) < 1) {
venaas's avatar
venaas committed
900
	    debug(DBG_WARN, "verifyconfcert: CN not matching regex");
venaas's avatar
venaas committed
901
	    return 0;
902
	}
venaas's avatar
venaas committed
903
	debug(DBG_DBG, "verifyconfcert: CN matching regex");
904
905
    }
    if (conf->certuriregex) {
venaas's avatar
venaas committed
906
	if (subjectaltnameregexp(cert, GEN_URI, NULL, conf->certuriregex) < 1) {
venaas's avatar
venaas committed
907
	    debug(DBG_WARN, "verifyconfcert: subjectaltname URI not matching regex");
venaas's avatar
venaas committed
908
	    return 0;
909
	}
venaas's avatar
venaas committed
910
	debug(DBG_DBG, "verifyconfcert: subjectaltname URI matching regex");
911
    }
912
    return 1;
913
914
}

venaas's avatar
 
venaas committed
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
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
930
	EVP_DigestUpdate(&mdctx, sec, strlen((char *)sec)) &&
venaas's avatar
 
venaas committed
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
	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
957
	      EVP_DigestUpdate(&mdctx, sec, strlen((char *)sec)) &&
venaas's avatar
 
venaas committed
958
959
960
961
962
963
964
	      EVP_DigestFinal_ex(&mdctx, hash, &len) &&
	      len == 16 &&
	      !memcmp(hash, rad + 4, 16));
    pthread_mutex_unlock(&lock);
    return result;
}
	      
venaas's avatar
venaas committed
965
int checkmessageauth(unsigned char *rad, uint8_t *authattr, char *secret) {
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
    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
984
    memcpy(authattr, auth, 16);
985
    if (md_len != 16) {
986
	debug(DBG_WARN, "message auth computation failed");
987
988
989
990
991
	pthread_mutex_unlock(&lock);
	return 0;
    }

    if (memcmp(auth, hash, 16)) {
992
	debug(DBG_WARN, "message authenticator, wrong value");
993
994
995
996
997
998
999
1000
	pthread_mutex_unlock(&lock);
	return 0;
    }	
	
    pthread_mutex_unlock(&lock);
    return 1;
}