2 * ngIRCd -- The Next Generation IRC Daemon
3 * Copyright (c)2005-2008 Florian Westphal (fw@strlen.de).
4 * Copyright (c)2008-2014 Alexander Barton (alex@barton.de) and Contributors.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 * Please read the file COPYING, README and AUTHORS for more information.
17 * SSL wrapper functions
34 #include "conn-func.h"
40 extern struct SSLOptions Conf_SSLOptions;
43 #include <openssl/err.h>
44 #include <openssl/rand.h>
45 #include <openssl/dh.h>
47 static SSL_CTX * ssl_ctx;
50 static bool ConnSSL_LoadServerKey_openssl PARAMS(( SSL_CTX *c ));
54 #include <sys/types.h>
58 #include <gnutls/x509.h>
61 #define DH_BITS_MIN 1024
63 #define MAX_HASH_SIZE 64 /* from gnutls-int.h */
65 static gnutls_certificate_credentials_t x509_cred;
66 static gnutls_dh_params_t dh_params;
67 static gnutls_priority_t priorities_cache;
68 static bool ConnSSL_LoadServerKey_gnutls PARAMS(( void ));
71 #define SHA256_STRING_LEN (32 * 2 + 1)
73 static bool ConnSSL_Init_SSL PARAMS(( CONNECTION *c ));
74 static int ConnectAccept PARAMS(( CONNECTION *c, bool connect ));
75 static int ConnSSL_HandleError PARAMS(( CONNECTION *c, const int code, const char *fname ));
78 static char * openreadclose(const char *name, size_t *len)
83 int fd = open(name, O_RDONLY);
85 Log(LOG_ERR, "Could not open %s: %s", name, strerror(errno));
89 Log(LOG_ERR, "Could not fstat %s: %s", name, strerror(errno));
92 if (!S_ISREG(s.st_mode)) {
93 Log(LOG_ERR, "%s: Not a regular file", name);
97 Log(LOG_ERR, "%s: invalid file length (size %ld <= 0)", name, (long) s.st_size);
100 buf = malloc(s.st_size);
102 Log(LOG_ERR, "Could not malloc %lu bytes for file %s: %s", s.st_size, name, strerror(errno));
105 br = read(fd, buf, s.st_size);
106 if (br != (ssize_t)s.st_size) {
107 Log(LOG_ERR, "Could not read file %s: read returned %ld, expected %ld: %s",
108 name, (long) br, (long) s.st_size, br == -1 ? strerror(errno):"short read?!");
109 memset(buf, 0, s.st_size);
124 * Log OpenSSL error message.
126 * @param msg The error message.
127 * @param info Additional information text or NULL.
130 LogOpenSSLError(const char *error, const char *info)
132 unsigned long err = ERR_get_error();
134 ? ERR_error_string(err, NULL)
135 : "Unable to determine error";
137 assert(error != NULL);
140 Log(LOG_ERR, "%s: %s (%s)", error, info, errmsg);
142 Log(LOG_ERR, "%s: %s", error, errmsg);
147 pem_passwd_cb(char *buf, int size, int rwflag, void *password)
149 array *pass = password;
152 (void)rwflag; /* rwflag is unused if DEBUG is not set. */
153 assert(rwflag == 0); /* 0 -> callback used for decryption.
154 * See SSL_CTX_set_default_passwd_cb(3) */
156 passlen = (int) array_bytes(pass);
158 LogDebug("pem_passwd_cb buf size %d, array size %d", size, passlen);
159 assert(passlen >= 0);
161 Log(LOG_ERR, "PEM password required but not set [in pem_passwd_cb()]!");
164 size = passlen > size ? size : passlen;
165 memcpy(buf, (char *)(array_start(pass)), size);
171 Verify_openssl(UNUSED int preverify_ok, UNUSED X509_STORE_CTX *x509_ctx)
185 if (!Conf_SSLOptions.DHFile) {
186 Log(LOG_NOTICE, "Configuration option \"DHFile\" not set!");
189 fp = fopen(Conf_SSLOptions.DHFile, "r");
191 Log(LOG_ERR, "%s: %s", Conf_SSLOptions.DHFile, strerror(errno));
194 dh_params = PEM_read_DHparams(fp, NULL, NULL, NULL);
196 Log(LOG_ERR, "%s: Failed to read SSL DH parameters!",
197 Conf_SSLOptions.DHFile);
203 #ifdef HAVE_LIBGNUTLS
204 bool need_dhgenerate = true;
206 gnutls_dh_params_t tmp_dh_params;
208 err = gnutls_dh_params_init(&tmp_dh_params);
210 Log(LOG_ERR, "Failed to initialize SSL DH parameters: %s",
211 gnutls_strerror(err));
214 if (Conf_SSLOptions.DHFile) {
215 gnutls_datum_t dhparms;
217 dhparms.data = (unsigned char *) openreadclose(Conf_SSLOptions.DHFile, &size);
220 err = gnutls_dh_params_import_pkcs3(tmp_dh_params, &dhparms, GNUTLS_X509_FMT_PEM);
222 need_dhgenerate = false;
225 "Failed to initialize SSL DH parameters: %s",
226 gnutls_strerror(err));
228 memset(dhparms.data, 0, size);
232 if (need_dhgenerate) {
234 "DHFile not set, generating %u bit DH parameters. This may take a while ...",
236 err = gnutls_dh_params_generate2(tmp_dh_params, DH_BITS);
238 Log(LOG_ERR, "Failed to generate SSL DH parameters: %s",
239 gnutls_strerror(err));
243 dh_params = tmp_dh_params;
249 void ConnSSL_Free(CONNECTION *c)
252 SSL *ssl = c->ssl_state.ssl;
256 c->ssl_state.ssl = NULL;
257 if (c->ssl_state.fingerprint) {
258 free(c->ssl_state.fingerprint);
259 c->ssl_state.fingerprint = NULL;
263 #ifdef HAVE_LIBGNUTLS
264 gnutls_session_t sess = c->ssl_state.gnutls_session;
265 if (Conn_OPTION_ISSET(c, CONN_SSL)) {
266 gnutls_bye(sess, GNUTLS_SHUT_RDWR);
270 assert(Conn_OPTION_ISSET(c, CONN_SSL));
271 /* can't just set bitmask to 0 -- there are other, non-ssl related flags, e.g. CONN_ZIP. */
272 Conn_OPTION_DEL(c, CONN_SSL_FLAGS_ALL);
277 ConnSSL_InitLibrary( void )
279 if (!Conf_SSLInUse()) {
280 LogDebug("SSL not in use, skipping initialization.");
287 #if OPENSSL_API_COMPAT < 0x10100000L
290 SSL_load_error_strings();
294 if (!RAND_status()) {
295 Log(LOG_ERR, "OpenSSL PRNG not seeded: /dev/urandom missing?");
297 * it is probably best to fail and let the user install EGD or
298 * a similar program if no kernel random device is available.
299 * According to OpenSSL RAND_egd(3): "The automatic query of
300 * /var/run/egd-pool et al was added in OpenSSL 0.9.7";
301 * so it makes little sense to deal with PRNGD seeding ourselves.
303 array_free(&Conf_SSLOptions.ListenPorts);
307 newctx = SSL_CTX_new(SSLv23_method());
309 LogOpenSSLError("Failed to create SSL context", NULL);
310 array_free(&Conf_SSLOptions.ListenPorts);
314 if (!ConnSSL_LoadServerKey_openssl(newctx))
317 if (SSL_CTX_set_cipher_list(newctx, Conf_SSLOptions.CipherList) == 0) {
318 Log(LOG_ERR, "Failed to apply OpenSSL cipher list \"%s\"!",
319 Conf_SSLOptions.CipherList);
323 SSL_CTX_set_session_id_context(newctx, (unsigned char *)"ngircd", 6);
324 SSL_CTX_set_options(newctx, SSL_OP_SINGLE_DH_USE|SSL_OP_NO_SSLv2);
325 SSL_CTX_set_mode(newctx, SSL_MODE_ENABLE_PARTIAL_WRITE);
326 SSL_CTX_set_verify(newctx, SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE,
328 SSL_CTX_free(ssl_ctx);
330 Log(LOG_INFO, "%s initialized.", OpenSSL_version(OPENSSL_VERSION));
333 SSL_CTX_free(newctx);
334 array_free(&Conf_SSLOptions.ListenPorts);
337 #ifdef HAVE_LIBGNUTLS
339 static bool initialized;
342 /* TODO: cannot reload gnutls keys: can't simply free x509
343 * context -- it may still be in use */
347 err = gnutls_global_init();
349 Log(LOG_ERR, "Failed to initialize GnuTLS: %s",
350 gnutls_strerror(err));
354 if (!ConnSSL_LoadServerKey_gnutls())
357 if (gnutls_priority_init(&priorities_cache, Conf_SSLOptions.CipherList,
358 NULL) != GNUTLS_E_SUCCESS) {
360 "Failed to apply GnuTLS cipher list \"%s\"!",
361 Conf_SSLOptions.CipherList);
365 Log(LOG_INFO, "GnuTLS %s initialized.", gnutls_check_version(NULL));
369 array_free(&Conf_SSLOptions.ListenPorts);
375 #ifdef HAVE_LIBGNUTLS
377 ConnSSL_LoadServerKey_gnutls(void)
380 const char *cert_file;
382 err = gnutls_certificate_allocate_credentials(&x509_cred);
384 Log(LOG_ERR, "Failed to allocate certificate credentials: %s",
385 gnutls_strerror(err));
389 cert_file = Conf_SSLOptions.CertFile ? Conf_SSLOptions.CertFile:Conf_SSLOptions.KeyFile;
391 Log(LOG_ERR, "No SSL server key configured!");
395 if (array_bytes(&Conf_SSLOptions.KeyFilePassword))
397 "Ignoring SSL \"KeyFilePassword\": Not supported by GnuTLS.");
399 if (!Load_DH_params())
402 gnutls_certificate_set_dh_params(x509_cred, dh_params);
403 err = gnutls_certificate_set_x509_key_file(x509_cred, cert_file, Conf_SSLOptions.KeyFile, GNUTLS_X509_FMT_PEM);
406 "Failed to set certificate key file (cert %s, key %s): %s",
408 Conf_SSLOptions.KeyFile ? Conf_SSLOptions.KeyFile : "(NULL)",
409 gnutls_strerror(err));
419 ConnSSL_LoadServerKey_openssl(SSL_CTX *ctx)
424 if (!Conf_SSLOptions.KeyFile) {
425 Log(LOG_ERR, "No SSL server key configured!");
429 SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_cb);
430 SSL_CTX_set_default_passwd_cb_userdata(ctx, &Conf_SSLOptions.KeyFilePassword);
432 if (SSL_CTX_use_PrivateKey_file(ctx, Conf_SSLOptions.KeyFile, SSL_FILETYPE_PEM) != 1) {
433 array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
434 LogOpenSSLError("Failed to add private key", Conf_SSLOptions.KeyFile);
438 cert_key = Conf_SSLOptions.CertFile ? Conf_SSLOptions.CertFile:Conf_SSLOptions.KeyFile;
439 if (SSL_CTX_use_certificate_chain_file(ctx, cert_key) != 1) {
440 array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
441 LogOpenSSLError("Failed to load certificate chain", cert_key);
445 array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
447 if (!SSL_CTX_check_private_key(ctx)) {
448 LogOpenSSLError("Server private key does not match certificate", NULL);
451 if (Load_DH_params()) {
452 if (SSL_CTX_set_tmp_dh(ctx, dh_params) != 1)
453 LogOpenSSLError("Error setting DH parameters", Conf_SSLOptions.DHFile);
454 /* don't return false here: the non-DH modes will still work */
464 ConnSSL_Init_SSL(CONNECTION *c)
468 LogDebug("Initializing SSL ...");
474 "Can't initialize SSL context, OpenSSL initialization failed at startup!");
477 assert(c->ssl_state.ssl == NULL);
478 assert(c->ssl_state.fingerprint == NULL);
480 c->ssl_state.ssl = SSL_new(ssl_ctx);
481 if (!c->ssl_state.ssl) {
482 LogOpenSSLError("Failed to create SSL structure", NULL);
485 Conn_OPTION_ADD(c, CONN_SSL);
487 ret = SSL_set_fd(c->ssl_state.ssl, c->sock);
489 LogOpenSSLError("Failed to set SSL file descriptor", NULL);
494 #ifdef HAVE_LIBGNUTLS
495 Conn_OPTION_ADD(c, CONN_SSL);
496 ret = gnutls_priority_set(c->ssl_state.gnutls_session, priorities_cache);
497 if (ret != GNUTLS_E_SUCCESS) {
498 Log(LOG_ERR, "Failed to set GnuTLS session priorities: %s",
499 gnutls_strerror(ret));
504 * The intermediate (long) cast is here to avoid a warning like:
505 * "cast to pointer from integer of different size" on 64-bit platforms.
506 * There doesn't seem to be an alternate GNUTLS API we could use instead, see e.g.
507 * http://www.mail-archive.com/help-gnutls@gnu.org/msg00286.html
509 gnutls_transport_set_ptr(c->ssl_state.gnutls_session,
510 (gnutls_transport_ptr_t) (long) c->sock);
511 gnutls_certificate_server_set_request(c->ssl_state.gnutls_session,
512 GNUTLS_CERT_REQUEST);
513 ret = gnutls_credentials_set(c->ssl_state.gnutls_session,
514 GNUTLS_CRD_CERTIFICATE, x509_cred);
516 Log(LOG_ERR, "Failed to set SSL credentials: %s",
517 gnutls_strerror(ret));
521 gnutls_dh_set_prime_bits(c->ssl_state.gnutls_session, DH_BITS_MIN);
528 ConnSSL_PrepareConnect(CONNECTION *c, UNUSED CONF_SERVER *s)
531 #ifdef HAVE_LIBGNUTLS
534 err = gnutls_init(&c->ssl_state.gnutls_session, GNUTLS_CLIENT);
536 Log(LOG_ERR, "Failed to initialize new SSL session: %s",
537 gnutls_strerror(err));
541 ret = ConnSSL_Init_SSL(c);
544 Conn_OPTION_ADD(c, CONN_SSL_CONNECT);
546 assert(c->ssl_state.ssl);
547 SSL_set_verify(c->ssl_state.ssl, SSL_VERIFY_NONE, NULL);
554 * Check and handle error return codes after failed calls to SSL functions.
557 * SSL_connect(), SSL_accept(), SSL_do_handshake(), SSL_read(), SSL_peek(), or
558 * SSL_write() on ssl.
561 * gnutlsssl_read(), gnutls_write() or gnutls_handshake().
563 * @param c The connection handle.
564 * @prarm code The return code.
565 * @param fname The name of the function in which the error occurred.
566 * @return -1 on fatal errors, 0 if we can try again later.
569 ConnSSL_HandleError(CONNECTION * c, const int code, const char *fname)
572 int ret = SSL_ERROR_SYSCALL;
573 unsigned long sslerr;
574 int real_errno = errno;
576 ret = SSL_get_error(c->ssl_state.ssl, code);
579 case SSL_ERROR_WANT_READ:
580 io_event_del(c->sock, IO_WANTWRITE);
581 Conn_OPTION_ADD(c, CONN_SSL_WANT_READ);
582 return 0; /* try again later */
583 case SSL_ERROR_WANT_WRITE:
584 io_event_del(c->sock, IO_WANTREAD);
585 Conn_OPTION_ADD(c, CONN_SSL_WANT_WRITE); /* fall through */
587 return 0; /* try again later */
588 case SSL_ERROR_ZERO_RETURN:
589 LogDebug("SSL connection shut down normally.");
591 case SSL_ERROR_SYSCALL:
592 /* SSL_ERROR_WANT_CONNECT, SSL_ERROR_WANT_ACCEPT,
593 * and SSL_ERROR_WANT_X509_LOOKUP */
594 sslerr = ERR_get_error();
596 Log(LOG_ERR, "SSL error: %s [in %s()]!",
597 ERR_error_string(sslerr, NULL), fname);
599 switch (code) { /* EOF that violated protocol */
602 "SSL error, client disconnected [in %s()]!",
605 case -1: /* low level socket I/O error, check errno */
606 Log(LOG_ERR, "SSL error: %s [in %s()]!",
607 strerror(real_errno), fname);
612 LogOpenSSLError("SSL protocol error", fname);
615 Log(LOG_ERR, "Unknown SSL error %d [in %s()]!", ret, fname);
620 #ifdef HAVE_LIBGNUTLS
623 case GNUTLS_E_INTERRUPTED:
624 if (gnutls_record_get_direction(c->ssl_state.gnutls_session)) {
625 Conn_OPTION_ADD(c, CONN_SSL_WANT_WRITE);
626 io_event_del(c->sock, IO_WANTREAD);
628 Conn_OPTION_ADD(c, CONN_SSL_WANT_READ);
629 io_event_del(c->sock, IO_WANTWRITE);
634 if (gnutls_error_is_fatal(code)) {
635 Log(LOG_ERR, "SSL error: %s [%s].",
636 gnutls_strerror(code), fname);
647 ConnSSL_LogCertInfo( CONNECTION *c )
650 SSL *ssl = c->ssl_state.ssl;
654 Log(LOG_INFO, "Connection %d: initialized %s using cipher %s.",
655 c->sock, SSL_get_version(ssl), SSL_get_cipher(ssl));
657 #ifdef HAVE_LIBGNUTLS
658 gnutls_session_t sess = c->ssl_state.gnutls_session;
659 gnutls_cipher_algorithm_t cipher = gnutls_cipher_get(sess);
661 Log(LOG_INFO, "Connection %d: initialized %s using cipher %s-%s.",
663 gnutls_protocol_get_name(gnutls_protocol_get_version(sess)),
664 gnutls_cipher_get_name(cipher),
665 gnutls_mac_get_name(gnutls_mac_get(sess)));
671 Accept incoming SSL connection.
673 1: SSL Connection established
675 -1: SSL Connection not established due to fatal error.
678 ConnSSL_Accept( CONNECTION *c )
681 if (!Conn_OPTION_ISSET(c, CONN_SSL)) {
682 #ifdef HAVE_LIBGNUTLS
683 int err = gnutls_init(&c->ssl_state.gnutls_session, GNUTLS_SERVER);
685 Log(LOG_ERR, "Failed to initialize new SSL session: %s",
686 gnutls_strerror(err));
690 if (!ConnSSL_Init_SSL(c))
693 return ConnectAccept(c, false );
698 ConnSSL_Connect( CONNECTION *c )
702 assert(c->ssl_state.ssl);
704 assert(Conn_OPTION_ISSET(c, CONN_SSL));
705 return ConnectAccept(c, true);
709 ConnSSL_InitCertFp( CONNECTION *c )
711 const char hex[] = "0123456789abcdef";
715 unsigned char digest[EVP_MAX_MD_SIZE];
716 unsigned int digest_size;
719 cert = SSL_get_peer_certificate(c->ssl_state.ssl);
723 if (!X509_digest(cert, EVP_sha256(), digest, &digest_size)) {
729 #endif /* HAVE_LIBSSL */
730 #ifdef HAVE_LIBGNUTLS
731 gnutls_x509_crt_t cert;
732 unsigned int cert_list_size;
733 const gnutls_datum_t *cert_list;
734 unsigned char digest[MAX_HASH_SIZE];
737 if (gnutls_certificate_type_get(c->ssl_state.gnutls_session) !=
741 if (gnutls_x509_crt_init(&cert) != GNUTLS_E_SUCCESS)
745 cert_list = gnutls_certificate_get_peers(c->ssl_state.gnutls_session,
748 gnutls_x509_crt_deinit(cert);
752 if (gnutls_x509_crt_import(cert, &cert_list[0],
753 GNUTLS_X509_FMT_DER) != GNUTLS_E_SUCCESS) {
754 gnutls_x509_crt_deinit(cert);
758 digest_size = sizeof(digest);
759 if (gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_SHA256, digest,
761 gnutls_x509_crt_deinit(cert);
765 gnutls_x509_crt_deinit(cert);
766 #endif /* HAVE_LIBGNUTLS */
768 assert(c->ssl_state.fingerprint == NULL);
770 c->ssl_state.fingerprint = malloc(SHA256_STRING_LEN);
771 if (!c->ssl_state.fingerprint)
774 for (i = 0; i < (int)digest_size; i++) {
775 c->ssl_state.fingerprint[i * 2] = hex[digest[i] / 16];
776 c->ssl_state.fingerprint[i * 2 + 1] = hex[digest[i] % 16];
778 c->ssl_state.fingerprint[i * 2] = '\0';
783 /* accept/connect wrapper. if connect is true, connect to peer, otherwise wait for incoming connection */
785 ConnectAccept( CONNECTION *c, bool connect)
789 SSL *ssl = c->ssl_state.ssl;
792 ret = connect ? SSL_connect(ssl) : SSL_accept(ssl);
794 return ConnSSL_HandleError(c, ret, connect ? "SSL_connect": "SSL_accept");
796 #ifdef HAVE_LIBGNUTLS
798 ret = gnutls_handshake(c->ssl_state.gnutls_session);
800 return ConnSSL_HandleError(c, ret, "gnutls_handshake");
802 (void)ConnSSL_InitCertFp(c);
804 Conn_OPTION_DEL(c, (CONN_SSL_WANT_WRITE|CONN_SSL_WANT_READ|CONN_SSL_CONNECT));
805 ConnSSL_LogCertInfo(c);
807 Conn_StartLogin(CONNECTION2ID(c));
813 ConnSSL_Write(CONNECTION *c, const void *buf, size_t count)
817 Conn_OPTION_DEL(c, CONN_SSL_WANT_WRITE|CONN_SSL_WANT_READ);
821 bw = (ssize_t) SSL_write(c->ssl_state.ssl, buf, count);
823 #ifdef HAVE_LIBGNUTLS
824 bw = gnutls_write(c->ssl_state.gnutls_session, buf, count);
828 if (ConnSSL_HandleError( c, bw, "ConnSSL_Write") == 0)
829 errno = EAGAIN; /* try again */
835 ConnSSL_Read(CONNECTION *c, void * buf, size_t count)
839 Conn_OPTION_DEL(c, CONN_SSL_WANT_WRITE|CONN_SSL_WANT_READ);
841 br = (ssize_t) SSL_read(c->ssl_state.ssl, buf, count);
842 if (br > 0) /* on EOF we have to call ConnSSL_HandleError(), see SSL_read(3) */
845 #ifdef HAVE_LIBGNUTLS
846 br = gnutls_read(c->ssl_state.gnutls_session, buf, count);
847 if (br >= 0) /* on EOF we must _not_ call ConnSSL_HandleError, see gnutls_record_recv(3) */
850 /* error on read: switch ConnSSL_HandleError() return values -> 0 is "try again", so return -1 and set EAGAIN */
851 if (ConnSSL_HandleError(c, br, "ConnSSL_Read") == 0) {
860 ConnSSL_GetCipherInfo(CONNECTION *c, char *buf, size_t len)
864 SSL *ssl = c->ssl_state.ssl;
869 SSL_CIPHER_description(SSL_get_current_cipher(ssl), buf, len);
870 nl = strchr(buf, '\n');
875 #ifdef HAVE_LIBGNUTLS
876 if (Conn_OPTION_ISSET(c, CONN_SSL)) {
877 const char *name_cipher, *name_mac, *name_proto, *name_keyexchange;
880 gnutls_session_t sess = c->ssl_state.gnutls_session;
881 gnutls_cipher_algorithm_t cipher = gnutls_cipher_get(sess);
882 name_cipher = gnutls_cipher_get_name(cipher);
883 name_mac = gnutls_mac_get_name(gnutls_mac_get(sess));
884 keysize = gnutls_cipher_get_key_size(cipher) * 8;
885 name_proto = gnutls_protocol_get_name(gnutls_protocol_get_version(sess));
886 name_keyexchange = gnutls_kx_get_name(gnutls_kx_get(sess));
888 return snprintf(buf, len, "%s-%s%15s Kx=%s Enc=%s(%u) Mac=%s",
889 name_cipher, name_mac, name_proto, name_keyexchange, name_cipher, keysize, name_mac) > 0;
896 ConnSSL_GetCertFp(CONNECTION *c)
898 return c->ssl_state.fingerprint;
902 ConnSSL_SetCertFp(CONNECTION *c, const char *fingerprint)
905 c->ssl_state.fingerprint = strndup(fingerprint, SHA256_STRING_LEN - 1);
906 return c->ssl_state.fingerprint != NULL;
911 ConnSSL_InitLibrary(void)
916 #endif /* SSL_SUPPORT */