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1.6 ! jsing 1: /* $OpenBSD: s_cb.c,v 1.5 2015/09/10 06:36:45 bcook Exp $ */
1.1 jsing 2: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3: * All rights reserved.
4: *
5: * This package is an SSL implementation written
6: * by Eric Young (eay@cryptsoft.com).
7: * The implementation was written so as to conform with Netscapes SSL.
8: *
9: * This library is free for commercial and non-commercial use as long as
10: * the following conditions are aheared to. The following conditions
11: * apply to all code found in this distribution, be it the RC4, RSA,
12: * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13: * included with this distribution is covered by the same copyright terms
14: * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15: *
16: * Copyright remains Eric Young's, and as such any Copyright notices in
17: * the code are not to be removed.
18: * If this package is used in a product, Eric Young should be given attribution
19: * as the author of the parts of the library used.
20: * This can be in the form of a textual message at program startup or
21: * in documentation (online or textual) provided with the package.
22: *
23: * Redistribution and use in source and binary forms, with or without
24: * modification, are permitted provided that the following conditions
25: * are met:
26: * 1. Redistributions of source code must retain the copyright
27: * notice, this list of conditions and the following disclaimer.
28: * 2. Redistributions in binary form must reproduce the above copyright
29: * notice, this list of conditions and the following disclaimer in the
30: * documentation and/or other materials provided with the distribution.
31: * 3. All advertising materials mentioning features or use of this software
32: * must display the following acknowledgement:
33: * "This product includes cryptographic software written by
34: * Eric Young (eay@cryptsoft.com)"
35: * The word 'cryptographic' can be left out if the rouines from the library
36: * being used are not cryptographic related :-).
37: * 4. If you include any Windows specific code (or a derivative thereof) from
38: * the apps directory (application code) you must include an acknowledgement:
39: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40: *
41: * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51: * SUCH DAMAGE.
52: *
53: * The licence and distribution terms for any publically available version or
54: * derivative of this code cannot be changed. i.e. this code cannot simply be
55: * copied and put under another distribution licence
56: * [including the GNU Public Licence.]
57: */
58: /* ====================================================================
59: * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
60: *
61: * Redistribution and use in source and binary forms, with or without
62: * modification, are permitted provided that the following conditions
63: * are met:
64: *
65: * 1. Redistributions of source code must retain the above copyright
66: * notice, this list of conditions and the following disclaimer.
67: *
68: * 2. Redistributions in binary form must reproduce the above copyright
69: * notice, this list of conditions and the following disclaimer in
70: * the documentation and/or other materials provided with the
71: * distribution.
72: *
73: * 3. All advertising materials mentioning features or use of this
74: * software must display the following acknowledgment:
75: * "This product includes software developed by the OpenSSL Project
76: * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77: *
78: * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79: * endorse or promote products derived from this software without
80: * prior written permission. For written permission, please contact
81: * openssl-core@openssl.org.
82: *
83: * 5. Products derived from this software may not be called "OpenSSL"
84: * nor may "OpenSSL" appear in their names without prior written
85: * permission of the OpenSSL Project.
86: *
87: * 6. Redistributions of any form whatsoever must retain the following
88: * acknowledgment:
89: * "This product includes software developed by the OpenSSL Project
90: * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91: *
92: * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93: * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99: * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101: * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103: * OF THE POSSIBILITY OF SUCH DAMAGE.
104: * ====================================================================
105: *
106: * This product includes cryptographic software written by Eric Young
107: * (eay@cryptsoft.com). This product includes software written by Tim
108: * Hudson (tjh@cryptsoft.com).
109: *
110: */
111:
112: #include <sys/socket.h>
113:
114: #include <netinet/in.h>
115:
116: #include <netdb.h>
117: #include <stdio.h>
118: #include <stdlib.h>
119: #include <string.h>
120:
121: #include "apps.h"
122:
123: #include <openssl/err.h>
124: #include <openssl/ssl.h>
125: #include <openssl/x509.h>
126:
127: #include "s_apps.h"
128:
129: #define COOKIE_SECRET_LENGTH 16
130:
131: int verify_depth = 0;
132: int verify_return_error = 0;
133: unsigned char cookie_secret[COOKIE_SECRET_LENGTH];
134: int cookie_initialized = 0;
135:
136: int
137: verify_callback(int ok, X509_STORE_CTX * ctx)
138: {
139: X509 *err_cert;
140: int err, depth;
141:
142: err_cert = X509_STORE_CTX_get_current_cert(ctx);
143: err = X509_STORE_CTX_get_error(ctx);
144: depth = X509_STORE_CTX_get_error_depth(ctx);
145:
146: BIO_printf(bio_err, "depth=%d ", depth);
147: if (err_cert) {
148: X509_NAME_print_ex(bio_err, X509_get_subject_name(err_cert),
149: 0, XN_FLAG_ONELINE);
150: BIO_puts(bio_err, "\n");
151: } else
152: BIO_puts(bio_err, "<no cert>\n");
153: if (!ok) {
154: BIO_printf(bio_err, "verify error:num=%d:%s\n", err,
155: X509_verify_cert_error_string(err));
156: if (verify_depth >= depth) {
157: if (!verify_return_error)
158: ok = 1;
159: } else {
160: ok = 0;
161: }
162: }
163: switch (err) {
164: case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
165: BIO_puts(bio_err, "issuer= ");
1.4 doug 166: if (err_cert == NULL)
167: BIO_puts(bio_err, "<error getting cert>");
168: else
169: X509_NAME_print_ex(bio_err,
170: X509_get_issuer_name(err_cert), 0, XN_FLAG_ONELINE);
1.1 jsing 171: BIO_puts(bio_err, "\n");
172: break;
173: case X509_V_ERR_CERT_NOT_YET_VALID:
174: case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
175: BIO_printf(bio_err, "notBefore=");
1.4 doug 176: if (err_cert == NULL)
177: BIO_printf(bio_err, " <error getting cert>");
178: else
179: ASN1_TIME_print(bio_err, X509_get_notBefore(err_cert));
1.1 jsing 180: BIO_printf(bio_err, "\n");
181: break;
182: case X509_V_ERR_CERT_HAS_EXPIRED:
183: case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
184: BIO_printf(bio_err, "notAfter=");
1.4 doug 185: if (err_cert == NULL)
186: BIO_printf(bio_err, " <error getting cert>");
187: else
188: ASN1_TIME_print(bio_err, X509_get_notAfter(err_cert));
1.1 jsing 189: BIO_printf(bio_err, "\n");
190: break;
191: case X509_V_ERR_NO_EXPLICIT_POLICY:
192: policies_print(bio_err, ctx);
193: break;
194: }
195: if (err == X509_V_OK && ok == 2)
196: policies_print(bio_err, ctx);
197:
198: BIO_printf(bio_err, "verify return:%d\n", ok);
199: return (ok);
200: }
201:
202: int
203: set_cert_stuff(SSL_CTX * ctx, char *cert_file, char *key_file)
204: {
205: if (cert_file != NULL) {
206: /*
207: SSL *ssl;
208: X509 *x509;
209: */
210:
211: if (SSL_CTX_use_certificate_file(ctx, cert_file,
212: SSL_FILETYPE_PEM) <= 0) {
213: BIO_printf(bio_err,
214: "unable to get certificate from '%s'\n", cert_file);
215: ERR_print_errors(bio_err);
216: return (0);
217: }
218: if (key_file == NULL)
219: key_file = cert_file;
220: if (SSL_CTX_use_PrivateKey_file(ctx, key_file,
221: SSL_FILETYPE_PEM) <= 0) {
222: BIO_printf(bio_err,
223: "unable to get private key from '%s'\n", key_file);
224: ERR_print_errors(bio_err);
225: return (0);
226: }
227: /*
228: In theory this is no longer needed
229: ssl=SSL_new(ctx);
230: x509=SSL_get_certificate(ssl);
231:
232: if (x509 != NULL) {
233: EVP_PKEY *pktmp;
234: pktmp = X509_get_pubkey(x509);
235: EVP_PKEY_copy_parameters(pktmp,
236: SSL_get_privatekey(ssl));
237: EVP_PKEY_free(pktmp);
238: }
239: SSL_free(ssl);
240: */
241:
242: /*
243: * If we are using DSA, we can copy the parameters from the
244: * private key
245: */
246:
247:
248: /*
249: * Now we know that a key and cert have been set against the
250: * SSL context
251: */
252: if (!SSL_CTX_check_private_key(ctx)) {
253: BIO_printf(bio_err,
254: "Private key does not match the certificate public key\n");
255: return (0);
256: }
257: }
258: return (1);
259: }
260:
261: int
262: set_cert_key_stuff(SSL_CTX * ctx, X509 * cert, EVP_PKEY * key)
263: {
264: if (cert == NULL)
265: return 1;
266: if (SSL_CTX_use_certificate(ctx, cert) <= 0) {
267: BIO_printf(bio_err, "error setting certificate\n");
268: ERR_print_errors(bio_err);
269: return 0;
270: }
271: if (SSL_CTX_use_PrivateKey(ctx, key) <= 0) {
272: BIO_printf(bio_err, "error setting private key\n");
273: ERR_print_errors(bio_err);
274: return 0;
275: }
276: /*
277: * Now we know that a key and cert have been set against the SSL
278: * context
279: */
280: if (!SSL_CTX_check_private_key(ctx)) {
281: BIO_printf(bio_err,
282: "Private key does not match the certificate public key\n");
283: return 0;
284: }
285: return 1;
286: }
287:
288: long
289: bio_dump_callback(BIO * bio, int cmd, const char *argp,
290: int argi, long argl, long ret)
291: {
292: BIO *out;
293:
294: out = (BIO *) BIO_get_callback_arg(bio);
295: if (out == NULL)
296: return (ret);
297:
298: if (cmd == (BIO_CB_READ | BIO_CB_RETURN)) {
299: BIO_printf(out,
300: "read from %p [%p] (%lu bytes => %ld (0x%lX))\n",
301: (void *) bio, argp, (unsigned long) argi, ret, ret);
302: BIO_dump(out, argp, (int) ret);
303: return (ret);
304: } else if (cmd == (BIO_CB_WRITE | BIO_CB_RETURN)) {
305: BIO_printf(out,
306: "write to %p [%p] (%lu bytes => %ld (0x%lX))\n",
307: (void *) bio, argp, (unsigned long) argi, ret, ret);
308: BIO_dump(out, argp, (int) ret);
309: }
310: return (ret);
311: }
312:
313: void
314: apps_ssl_info_callback(const SSL * s, int where, int ret)
315: {
316: const char *str;
317: int w;
318:
319: w = where & ~SSL_ST_MASK;
320:
321: if (w & SSL_ST_CONNECT)
322: str = "SSL_connect";
323: else if (w & SSL_ST_ACCEPT)
324: str = "SSL_accept";
325: else
326: str = "undefined";
327:
328: if (where & SSL_CB_LOOP) {
329: BIO_printf(bio_err, "%s:%s\n", str, SSL_state_string_long(s));
330: } else if (where & SSL_CB_ALERT) {
331: str = (where & SSL_CB_READ) ? "read" : "write";
332: BIO_printf(bio_err, "SSL3 alert %s:%s:%s\n", str,
333: SSL_alert_type_string_long(ret),
334: SSL_alert_desc_string_long(ret));
335: } else if (where & SSL_CB_EXIT) {
336: if (ret == 0)
337: BIO_printf(bio_err, "%s:failed in %s\n",
338: str, SSL_state_string_long(s));
339: else if (ret < 0) {
340: BIO_printf(bio_err, "%s:error in %s\n",
341: str, SSL_state_string_long(s));
342: }
343: }
344: }
345:
346:
347: void
348: msg_cb(int write_p, int version, int content_type, const void *buf, size_t len, SSL * ssl, void *arg)
349: {
350: BIO *bio = arg;
351: const char *str_write_p, *str_version, *str_content_type = "",
352: *str_details1 = "", *str_details2 = "";
353:
354: str_write_p = write_p ? ">>>" : "<<<";
355:
356: switch (version) {
357: case SSL2_VERSION:
358: str_version = "SSL 2.0";
359: break;
360: case SSL3_VERSION:
361: str_version = "SSL 3.0 ";
362: break;
363: case TLS1_VERSION:
364: str_version = "TLS 1.0 ";
365: break;
366: case TLS1_1_VERSION:
367: str_version = "TLS 1.1 ";
368: break;
369: case TLS1_2_VERSION:
370: str_version = "TLS 1.2 ";
371: break;
372: case DTLS1_VERSION:
373: str_version = "DTLS 1.0 ";
374: break;
375: default:
376: str_version = "???";
377: }
378:
379: if (version == SSL2_VERSION) {
380: str_details1 = "???";
381:
382: if (len > 0) {
383: switch (((const unsigned char *) buf)[0]) {
384: case 0:
385: str_details1 = ", ERROR:";
386: str_details2 = " ???";
387: if (len >= 3) {
388: unsigned err = (((const unsigned char *) buf)[1] << 8) + ((const unsigned char *) buf)[2];
389:
390: switch (err) {
391: case 0x0001:
392: str_details2 = " NO-CIPHER-ERROR";
393: break;
394: case 0x0002:
395: str_details2 = " NO-CERTIFICATE-ERROR";
396: break;
397: case 0x0004:
398: str_details2 = " BAD-CERTIFICATE-ERROR";
399: break;
400: case 0x0006:
401: str_details2 = " UNSUPPORTED-CERTIFICATE-TYPE-ERROR";
402: break;
403: }
404: }
405: break;
406: case 1:
407: str_details1 = ", CLIENT-HELLO";
408: break;
409: case 2:
410: str_details1 = ", CLIENT-MASTER-KEY";
411: break;
412: case 3:
413: str_details1 = ", CLIENT-FINISHED";
414: break;
415: case 4:
416: str_details1 = ", SERVER-HELLO";
417: break;
418: case 5:
419: str_details1 = ", SERVER-VERIFY";
420: break;
421: case 6:
422: str_details1 = ", SERVER-FINISHED";
423: break;
424: case 7:
425: str_details1 = ", REQUEST-CERTIFICATE";
426: break;
427: case 8:
428: str_details1 = ", CLIENT-CERTIFICATE";
429: break;
430: }
431: }
432: }
433: if (version == SSL3_VERSION || version == TLS1_VERSION ||
434: version == TLS1_1_VERSION || version == TLS1_2_VERSION ||
1.6 ! jsing 435: version == DTLS1_VERSION) {
1.1 jsing 436: switch (content_type) {
437: case 20:
438: str_content_type = "ChangeCipherSpec";
439: break;
440: case 21:
441: str_content_type = "Alert";
442: break;
443: case 22:
444: str_content_type = "Handshake";
445: break;
446: }
447:
448: if (content_type == 21) { /* Alert */
449: str_details1 = ", ???";
450:
451: if (len == 2) {
452: switch (((const unsigned char *) buf)[0]) {
453: case 1:
454: str_details1 = ", warning";
455: break;
456: case 2:
457: str_details1 = ", fatal";
458: break;
459: }
460:
461: str_details2 = " ???";
462: switch (((const unsigned char *) buf)[1]) {
463: case 0:
464: str_details2 = " close_notify";
465: break;
466: case 10:
467: str_details2 = " unexpected_message";
468: break;
469: case 20:
470: str_details2 = " bad_record_mac";
471: break;
472: case 21:
473: str_details2 = " decryption_failed";
474: break;
475: case 22:
476: str_details2 = " record_overflow";
477: break;
478: case 30:
479: str_details2 = " decompression_failure";
480: break;
481: case 40:
482: str_details2 = " handshake_failure";
483: break;
484: case 42:
485: str_details2 = " bad_certificate";
486: break;
487: case 43:
488: str_details2 = " unsupported_certificate";
489: break;
490: case 44:
491: str_details2 = " certificate_revoked";
492: break;
493: case 45:
494: str_details2 = " certificate_expired";
495: break;
496: case 46:
497: str_details2 = " certificate_unknown";
498: break;
499: case 47:
500: str_details2 = " illegal_parameter";
501: break;
502: case 48:
503: str_details2 = " unknown_ca";
504: break;
505: case 49:
506: str_details2 = " access_denied";
507: break;
508: case 50:
509: str_details2 = " decode_error";
510: break;
511: case 51:
512: str_details2 = " decrypt_error";
513: break;
514: case 60:
515: str_details2 = " export_restriction";
516: break;
517: case 70:
518: str_details2 = " protocol_version";
519: break;
520: case 71:
521: str_details2 = " insufficient_security";
522: break;
523: case 80:
524: str_details2 = " internal_error";
525: break;
526: case 90:
527: str_details2 = " user_canceled";
528: break;
529: case 100:
530: str_details2 = " no_renegotiation";
531: break;
532: case 110:
533: str_details2 = " unsupported_extension";
534: break;
535: case 111:
536: str_details2 = " certificate_unobtainable";
537: break;
538: case 112:
539: str_details2 = " unrecognized_name";
540: break;
541: case 113:
542: str_details2 = " bad_certificate_status_response";
543: break;
544: case 114:
545: str_details2 = " bad_certificate_hash_value";
546: break;
547: case 115:
548: str_details2 = " unknown_psk_identity";
549: break;
550: }
551: }
552: }
553: if (content_type == 22) { /* Handshake */
554: str_details1 = "???";
555:
556: if (len > 0) {
557: switch (((const unsigned char *) buf)[0]) {
558: case 0:
559: str_details1 = ", HelloRequest";
560: break;
561: case 1:
562: str_details1 = ", ClientHello";
563: break;
564: case 2:
565: str_details1 = ", ServerHello";
566: break;
567: case 3:
568: str_details1 = ", HelloVerifyRequest";
569: break;
570: case 11:
571: str_details1 = ", Certificate";
572: break;
573: case 12:
574: str_details1 = ", ServerKeyExchange";
575: break;
576: case 13:
577: str_details1 = ", CertificateRequest";
578: break;
579: case 14:
580: str_details1 = ", ServerHelloDone";
581: break;
582: case 15:
583: str_details1 = ", CertificateVerify";
584: break;
585: case 16:
586: str_details1 = ", ClientKeyExchange";
587: break;
588: case 20:
589: str_details1 = ", Finished";
590: break;
591: }
592: }
593: }
594: }
595: BIO_printf(bio, "%s %s%s [length %04lx]%s%s\n", str_write_p,
596: str_version, str_content_type, (unsigned long) len,
597: str_details1, str_details2);
598:
599: if (len > 0) {
600: size_t num, i;
601:
602: BIO_printf(bio, " ");
603: num = len;
1.3 doug 604:
1.1 jsing 605: for (i = 0; i < num; i++) {
606: if (i % 16 == 0 && i > 0)
607: BIO_printf(bio, "\n ");
608: BIO_printf(bio, " %02x",
609: ((const unsigned char *) buf)[i]);
610: }
611: if (i < len)
612: BIO_printf(bio, " ...");
613: BIO_printf(bio, "\n");
614: }
615: (void) BIO_flush(bio);
616: }
617:
618: void
619: tlsext_cb(SSL * s, int client_server, int type, unsigned char *data, int len,
620: void *arg)
621: {
622: BIO *bio = arg;
623: char *extname;
624:
625: switch (type) {
626: case TLSEXT_TYPE_server_name:
627: extname = "server name";
628: break;
629:
630: case TLSEXT_TYPE_max_fragment_length:
631: extname = "max fragment length";
632: break;
633:
634: case TLSEXT_TYPE_client_certificate_url:
635: extname = "client certificate URL";
636: break;
637:
638: case TLSEXT_TYPE_trusted_ca_keys:
639: extname = "trusted CA keys";
640: break;
641:
642: case TLSEXT_TYPE_truncated_hmac:
643: extname = "truncated HMAC";
644: break;
645:
646: case TLSEXT_TYPE_status_request:
647: extname = "status request";
648: break;
649:
650: case TLSEXT_TYPE_user_mapping:
651: extname = "user mapping";
652: break;
653:
654: case TLSEXT_TYPE_client_authz:
655: extname = "client authz";
656: break;
657:
658: case TLSEXT_TYPE_server_authz:
659: extname = "server authz";
660: break;
661:
662: case TLSEXT_TYPE_cert_type:
663: extname = "cert type";
664: break;
665:
666: case TLSEXT_TYPE_elliptic_curves:
667: extname = "elliptic curves";
668: break;
669:
670: case TLSEXT_TYPE_ec_point_formats:
671: extname = "EC point formats";
672: break;
673:
674: case TLSEXT_TYPE_srp:
675: extname = "SRP";
676: break;
677:
678: case TLSEXT_TYPE_signature_algorithms:
679: extname = "signature algorithms";
680: break;
681:
682: case TLSEXT_TYPE_use_srtp:
683: extname = "use SRTP";
684: break;
685:
686: case TLSEXT_TYPE_heartbeat:
687: extname = "heartbeat";
688: break;
689:
690: case TLSEXT_TYPE_session_ticket:
691: extname = "session ticket";
692: break;
693:
694: case TLSEXT_TYPE_renegotiate:
695: extname = "renegotiation info";
696: break;
697:
698: #ifdef TLSEXT_TYPE_next_proto_neg
699: case TLSEXT_TYPE_next_proto_neg:
700: extname = "next protocol";
701: break;
702: #endif
703:
704: default:
705: extname = "unknown";
706: break;
707:
708: }
709:
710: BIO_printf(bio, "TLS %s extension \"%s\" (id=%d), len=%d\n",
711: client_server ? "server" : "client", extname, type, len);
712: BIO_dump(bio, (char *) data, len);
713: (void) BIO_flush(bio);
714: }
715:
716: int
717: generate_cookie_callback(SSL * ssl, unsigned char *cookie,
718: unsigned int *cookie_len)
719: {
720: unsigned char *buffer, result[EVP_MAX_MD_SIZE];
721: unsigned int length, resultlength;
722: union {
723: struct sockaddr sa;
724: struct sockaddr_in s4;
725: struct sockaddr_in6 s6;
726: } peer;
727:
728: /* Initialize a random secret */
729: if (!cookie_initialized) {
1.2 jsing 730: arc4random_buf(cookie_secret, COOKIE_SECRET_LENGTH);
1.1 jsing 731: cookie_initialized = 1;
732: }
733: /* Read peer information */
734: (void) BIO_dgram_get_peer(SSL_get_rbio(ssl), &peer);
735:
736: /* Create buffer with peer's address and port */
737: length = 0;
738: switch (peer.sa.sa_family) {
739: case AF_INET:
740: length += sizeof(struct in_addr);
741: length += sizeof(peer.s4.sin_port);
742: break;
743: case AF_INET6:
744: length += sizeof(struct in6_addr);
745: length += sizeof(peer.s6.sin6_port);
746: break;
747: default:
748: OPENSSL_assert(0);
749: break;
750: }
751: buffer = malloc(length);
752:
753: if (buffer == NULL) {
754: BIO_printf(bio_err, "out of memory\n");
755: return 0;
756: }
757: switch (peer.sa.sa_family) {
758: case AF_INET:
759: memcpy(buffer, &peer.s4.sin_port, sizeof(peer.s4.sin_port));
760: memcpy(buffer + sizeof(peer.s4.sin_port),
761: &peer.s4.sin_addr, sizeof(struct in_addr));
762: break;
763: case AF_INET6:
764: memcpy(buffer, &peer.s6.sin6_port, sizeof(peer.s6.sin6_port));
765: memcpy(buffer + sizeof(peer.s6.sin6_port),
766: &peer.s6.sin6_addr, sizeof(struct in6_addr));
767: break;
768: default:
769: OPENSSL_assert(0);
770: break;
771: }
772:
773: /* Calculate HMAC of buffer using the secret */
774: HMAC(EVP_sha1(), cookie_secret, COOKIE_SECRET_LENGTH,
775: buffer, length, result, &resultlength);
776: free(buffer);
777:
778: memcpy(cookie, result, resultlength);
779: *cookie_len = resultlength;
780:
781: return 1;
782: }
783:
784: int
785: verify_cookie_callback(SSL * ssl, unsigned char *cookie, unsigned int cookie_len)
786: {
787: unsigned char *buffer, result[EVP_MAX_MD_SIZE];
788: unsigned int length, resultlength;
789: union {
790: struct sockaddr sa;
791: struct sockaddr_in s4;
792: struct sockaddr_in6 s6;
793: } peer;
794:
795: /* If secret isn't initialized yet, the cookie can't be valid */
796: if (!cookie_initialized)
797: return 0;
798:
799: /* Read peer information */
800: (void) BIO_dgram_get_peer(SSL_get_rbio(ssl), &peer);
801:
802: /* Create buffer with peer's address and port */
803: length = 0;
804: switch (peer.sa.sa_family) {
805: case AF_INET:
806: length += sizeof(struct in_addr);
807: length += sizeof(peer.s4.sin_port);
808: break;
809: case AF_INET6:
810: length += sizeof(struct in6_addr);
811: length += sizeof(peer.s6.sin6_port);
812: break;
813: default:
814: OPENSSL_assert(0);
815: break;
816: }
817: buffer = malloc(length);
818:
819: if (buffer == NULL) {
820: BIO_printf(bio_err, "out of memory\n");
821: return 0;
822: }
823: switch (peer.sa.sa_family) {
824: case AF_INET:
825: memcpy(buffer, &peer.s4.sin_port, sizeof(peer.s4.sin_port));
826: memcpy(buffer + sizeof(peer.s4.sin_port),
827: &peer.s4.sin_addr, sizeof(struct in_addr));
828: break;
829: case AF_INET6:
830: memcpy(buffer, &peer.s6.sin6_port, sizeof(peer.s6.sin6_port));
831: memcpy(buffer + sizeof(peer.s6.sin6_port),
832: &peer.s6.sin6_addr, sizeof(struct in6_addr));
833: break;
834: default:
835: OPENSSL_assert(0);
836: break;
837: }
838:
839: /* Calculate HMAC of buffer using the secret */
840: HMAC(EVP_sha1(), cookie_secret, COOKIE_SECRET_LENGTH,
841: buffer, length, result, &resultlength);
842: free(buffer);
843:
844: if (cookie_len == resultlength &&
845: memcmp(result, cookie, resultlength) == 0)
846: return 1;
847:
848: return 0;
849: }