1 /*********************************************************************
3 * File : $Source: /cvsroot/ijbswa/current/wolfssl.c,v $
5 * Purpose : File with TLS/SSL extension. Contains methods for
6 * creating, using and closing TLS/SSL connections
9 * Copyright : Copyright (C) 2018-2021 by Fabian Keil <fk@fabiankeil.de>
10 * Copyright (C) 2020 Maxim Antonov <mantonov@gmail.com>
11 * Copyright (C) 2017 Vaclav Svec. FIT CVUT.
13 * This program is free software; you can redistribute it
14 * and/or modify it under the terms of the GNU General
15 * Public License as published by the Free Software
16 * Foundation; either version 2 of the License, or (at
17 * your option) any later version.
19 * This program is distributed in the hope that it will
20 * be useful, but WITHOUT ANY WARRANTY; without even the
21 * implied warranty of MERCHANTABILITY or FITNESS FOR A
22 * PARTICULAR PURPOSE. See the GNU General Public
23 * License for more details.
25 * The GNU General Public License should be included with
26 * this file. If not, you can view it at
27 * http://www.gnu.org/copyleft/gpl.html
28 * or write to the Free Software Foundation, Inc., 59
29 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
31 *********************************************************************/
38 #include <wolfssl/options.h>
39 #include <wolfssl/openssl/x509v3.h>
40 #include <wolfssl/openssl/pem.h>
41 #include <wolfssl/ssl.h>
42 #include <wolfssl/wolfcrypt/coding.h>
43 #include <wolfssl/wolfcrypt/rsa.h>
50 #include "jbsockets.h"
52 #include "ssl_common.h"
54 static int ssl_certificate_is_invalid(const char *cert_file);
55 static int generate_host_certificate(struct client_state *csp,
56 const char *certificate_path, const char *key_path);
57 static void free_client_ssl_structures(struct client_state *csp);
58 static void free_server_ssl_structures(struct client_state *csp);
59 static int ssl_store_cert(struct client_state *csp, X509 *crt);
60 static void log_ssl_errors(int debuglevel, const char* fmt, ...) __attribute__((format(printf, 2, 3)));
62 static int wolfssl_initialized = 0;
65 * Whether or not sharing the RNG is thread-safe
66 * doesn't matter because we only use it with
67 * the certificate_mutex locked.
69 static WC_RNG wolfssl_rng;
71 #ifndef WOLFSSL_ALT_CERT_CHAINS
73 * Without WOLFSSL_ALT_CERT_CHAINS wolfSSL will reject valid
74 * certificates if the certificate chain contains CA certificates
75 * that are "only" signed by trusted CA certificates but aren't
76 * trusted CAs themselves.
78 #warning wolfSSL has been compiled without WOLFSSL_ALT_CERT_CHAINS
81 /*********************************************************************
83 * Function : wolfssl_init
85 * Description : Initializes wolfSSL library once
91 *********************************************************************/
92 static void wolfssl_init(void)
94 if (wolfssl_initialized == 0)
96 privoxy_mutex_lock(&ssl_init_mutex);
97 if (wolfssl_initialized == 0)
99 if (wolfSSL_Init() != WOLFSSL_SUCCESS)
101 log_error(LOG_LEVEL_FATAL, "Failed to initialize wolfSSL");
103 wc_InitRng(&wolfssl_rng);
104 wolfssl_initialized = 1;
106 privoxy_mutex_unlock(&ssl_init_mutex);
111 /*********************************************************************
113 * Function : is_ssl_pending
115 * Description : Tests if there are some waiting data on ssl connection.
116 * Only considers data that has actually been received
117 * locally and ignores data that is still on the fly
118 * or has not yet been sent by the remote end.
121 * 1 : ssl_attr = SSL context to test
123 * Returns : 0 => No data are pending
124 * >0 => Pending data length. XXX: really?
126 *********************************************************************/
127 extern size_t is_ssl_pending(struct ssl_attr *ssl_attr)
129 return (size_t)wolfSSL_pending(ssl_attr->wolfssl_attr.ssl);
133 /*********************************************************************
135 * Function : ssl_send_data
137 * Description : Sends the content of buf (for n bytes) to given SSL
138 * connection context.
141 * 1 : ssl_attr = SSL context to send data to
142 * 2 : buf = Pointer to data to be sent
143 * 3 : len = Length of data to be sent to the SSL context
145 * Returns : Length of sent data or negative value on error.
147 *********************************************************************/
148 extern int ssl_send_data(struct ssl_attr *ssl_attr, const unsigned char *buf, size_t len)
152 int pos = 0; /* Position of unsent part in buffer */
160 ssl = ssl_attr->wolfssl_attr.ssl;
161 fd = wolfSSL_get_fd(ssl);
165 int send_len = (int)len - pos;
167 log_error(LOG_LEVEL_WRITING, "TLS on socket %d: %N",
168 fd, send_len, buf+pos);
170 ret = wolfSSL_write(ssl, buf+pos, send_len);
173 log_ssl_errors(LOG_LEVEL_ERROR,
174 "Sending data on socket %d over TLS failed", fd);
178 /* Adding count of sent bytes to position in buffer */
186 /*********************************************************************
188 * Function : ssl_recv_data
190 * Description : Receives data from given SSL context and puts
194 * 1 : ssl_attr = SSL context to receive data from
195 * 2 : buf = Pointer to buffer where data will be written
196 * 3 : max_length = Maximum number of bytes to read
198 * Returns : Number of bytes read, 0 for EOF, or -1
201 *********************************************************************/
202 extern int ssl_recv_data(struct ssl_attr *ssl_attr, unsigned char *buf, size_t max_length)
208 memset(buf, 0, max_length);
211 * Receiving data from SSL context into buffer
213 ssl = ssl_attr->wolfssl_attr.ssl;
214 ret = wolfSSL_read(ssl, buf, (int)max_length);
215 fd = wolfSSL_get_fd(ssl);
219 log_ssl_errors(LOG_LEVEL_ERROR,
220 "Receiving data on socket %d over TLS failed", fd);
225 log_error(LOG_LEVEL_RECEIVED, "TLS from socket %d: %N",
232 /*********************************************************************
234 * Function : get_public_key_size_string
236 * Description : Translates a public key type to a string.
239 * 1 : key_type = The public key type.
241 * Returns : String containing the translated key size.
243 *********************************************************************/
244 static const char *get_public_key_size_string(int key_type)
249 return "RSA key size";
251 return "DSA key size";
253 return "EC key size";
255 return "non-RSA/DSA/EC key size";
260 /*********************************************************************
262 * Function : ssl_store_cert
264 * Description : This function is called once for each certificate in the
265 * server's certificate trusted chain and prepares
266 * information about the certificate. The information can
267 * be used to inform the user about invalid certificates.
270 * 1 : csp = Current client state (buffers, headers, etc...)
271 * 2 : cert = certificate from trusted chain
273 * Returns : 0 on success and negative value on error
275 *********************************************************************/
276 static int ssl_store_cert(struct client_state *csp, X509 *cert)
279 struct certs_chain *last = &(csp->server_certs_chain);
281 WOLFSSL_BIO *bio = BIO_new(BIO_s_mem());
282 WOLFSSL_EVP_PKEY *pkey = NULL;
283 char *bio_mem_data = NULL;
286 unsigned char serial_number[32];
287 int serial_number_size = sizeof(serial_number);
288 WOLFSSL_X509_NAME *issuer_name;
289 WOLFSSL_X509_NAME *subject_name;
290 char *subject_alternative_name;
292 int san_prefix_printed = 0;
296 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new() failed");
301 * Searching for last item in certificates linked list
303 while (last->next != NULL)
309 * Preparing next item in linked list for next certificate
311 last->next = zalloc_or_die(sizeof(struct certs_chain));
314 * Saving certificate file into buffer
316 if (wolfSSL_PEM_write_bio_X509(bio, cert) != WOLFSSL_SUCCESS)
318 log_ssl_errors(LOG_LEVEL_ERROR, "wolfSSL_PEM_write_bio_X509() failed");
323 len = wolfSSL_BIO_get_mem_data(bio, &bio_mem_data);
324 last->file_buf = malloc((size_t)len + 1);
325 if (last->file_buf == NULL)
327 log_error(LOG_LEVEL_ERROR,
328 "Failed to allocate %lu bytes to store the X509 PEM certificate",
334 strncpy(last->file_buf, bio_mem_data, (size_t)len);
335 last->file_buf[len] = '\0';
336 wolfSSL_BIO_free(bio);
337 bio = wolfSSL_BIO_new(wolfSSL_BIO_s_mem());
340 log_ssl_errors(LOG_LEVEL_ERROR, "wolfSSL_BIO_new() failed");
346 * Saving certificate information into buffer
348 l = wolfSSL_X509_get_version(cert);
349 if (l >= 0 && l <= 2)
351 if (wolfSSL_BIO_printf(bio, "cert. version : %ld\n", l + 1) <= 0)
353 log_ssl_errors(LOG_LEVEL_ERROR,
354 "wolfSSL_BIO_printf() for version failed");
361 if (wolfSSL_BIO_printf(bio, "cert. version : Unknown (%ld)\n", l) <= 0)
363 log_ssl_errors(LOG_LEVEL_ERROR,
364 "wolfSSL_BIO_printf() for version failed");
370 if (wolfSSL_BIO_puts(bio, "serial number : ") <= 0)
372 log_ssl_errors(LOG_LEVEL_ERROR,
373 "wolfSSL_BIO_puts() for serial number failed");
377 if (wolfSSL_X509_get_serial_number(cert, serial_number, &serial_number_size)
380 log_error(LOG_LEVEL_ERROR, "wolfSSL_X509_get_serial_number() failed");
385 if (serial_number_size <= (int)sizeof(char))
387 if (wolfSSL_BIO_printf(bio, "%lu (0x%lx)\n", serial_number[0],
388 serial_number[0]) <= 0)
390 log_ssl_errors(LOG_LEVEL_ERROR,
391 "wolfSSL_BIO_printf() for serial number as single byte failed");
399 for (i = 0; i < serial_number_size; i++)
401 if (wolfSSL_BIO_printf(bio, "%02x%c", serial_number[i],
402 ((i + 1 == serial_number_size) ? '\n' : ':')) <= 0)
404 log_ssl_errors(LOG_LEVEL_ERROR,
405 "wolfSSL_BIO_printf() for serial number bytes failed");
412 if (wolfSSL_BIO_puts(bio, "issuer name : ") <= 0)
414 log_ssl_errors(LOG_LEVEL_ERROR, "wolfSSL_BIO_puts() for issuer failed");
418 issuer_name = wolfSSL_X509_get_issuer_name(cert);
419 if (wolfSSL_X509_NAME_get_sz(issuer_name) <= 0)
421 if (wolfSSL_BIO_puts(bio, "none") <= 0)
423 log_ssl_errors(LOG_LEVEL_ERROR,
424 "wolfSSL_BIO_puts() for issuer name failed");
429 else if (wolfSSL_X509_NAME_print_ex(bio, issuer_name, 0, 0) < 0)
431 log_ssl_errors(LOG_LEVEL_ERROR,
432 "wolfSSL_X509_NAME_print_ex() for issuer failed");
437 if (wolfSSL_BIO_puts(bio, "\nsubject name : ") <= 0)
439 log_ssl_errors(LOG_LEVEL_ERROR,
440 "wolfSSL_BIO_puts() for subject name failed");
444 subject_name = wolfSSL_X509_get_subject_name(cert);
445 if (wolfSSL_X509_NAME_get_sz(subject_name) <= 0)
447 if (wolfSSL_BIO_puts(bio, "none") <= 0)
449 log_ssl_errors(LOG_LEVEL_ERROR,
450 "wolfSSL_BIO_puts() for subject name failed");
455 else if (wolfSSL_X509_NAME_print_ex(bio, subject_name, 0, 0) < 0)
457 log_ssl_errors(LOG_LEVEL_ERROR,
458 "wolfSSL_X509_NAME_print_ex() for subject name failed");
463 if (wolfSSL_BIO_puts(bio, "\nissued on : ") <= 0)
465 log_ssl_errors(LOG_LEVEL_ERROR,
466 "wolfSSL_BIO_puts() for issued on failed");
470 if (!wolfSSL_ASN1_TIME_print(bio, wolfSSL_X509_get_notBefore(cert)))
472 log_ssl_errors(LOG_LEVEL_ERROR,
473 "wolfSSL_ASN1_TIME_print() for issued on failed");
478 if (wolfSSL_BIO_puts(bio, "\nexpires on : ") <= 0)
480 log_ssl_errors(LOG_LEVEL_ERROR,
481 "wolfSSL_BIO_puts() for expires on failed");
485 if (!wolfSSL_ASN1_TIME_print(bio, wolfSSL_X509_get_notAfter(cert)))
487 log_ssl_errors(LOG_LEVEL_ERROR,
488 "wolfSSL_ASN1_TIME_print() for expires on failed");
493 /* XXX: Show signature algorithm */
495 pkey = wolfSSL_X509_get_pubkey(cert);
498 log_ssl_errors(LOG_LEVEL_ERROR, "wolfSSL_X509_get_pubkey() failed");
502 ret = wolfSSL_BIO_printf(bio, "\n%-18s: %d bits",
503 get_public_key_size_string(wolfSSL_EVP_PKEY_base_id(pkey)),
504 wolfSSL_EVP_PKEY_bits(pkey));
507 log_ssl_errors(LOG_LEVEL_ERROR,
508 "wolfSSL_BIO_printf() for key size failed");
514 * XXX: Show cert usage, etc.
516 loc = wolfSSL_X509_get_ext_by_NID(cert, NID_basic_constraints, -1);
519 WOLFSSL_X509_EXTENSION *ex = wolfSSL_X509_get_ext(cert, loc);
520 if (BIO_puts(bio, "\nbasic constraints : ") <= 0)
522 log_ssl_errors(LOG_LEVEL_ERROR,
523 "BIO_printf() for basic constraints failed");
527 if (!wolfSSL_X509V3_EXT_print(bio, ex, 0, 0))
529 if (!wolfSSL_ASN1_STRING_print_ex(bio,
530 wolfSSL_X509_EXTENSION_get_data(ex),
531 ASN1_STRFLGS_RFC2253))
533 log_ssl_errors(LOG_LEVEL_ERROR,
534 "wolfSSL_ASN1_STRING_print_ex() for basic constraints failed");
541 while ((subject_alternative_name = wolfSSL_X509_get_next_altname(cert))
544 if (san_prefix_printed == 0)
546 ret = wolfSSL_BIO_printf(bio, "\nsubject alt name : ");
547 san_prefix_printed = 1;
551 ret = wolfSSL_BIO_printf(bio, "%s ", subject_alternative_name);
555 log_ssl_errors(LOG_LEVEL_ERROR,
556 "wolfSSL_BIO_printf() for Subject Alternative Name failed");
564 * This code compiles but does not work because wolfSSL
565 * sets NID_netscape_cert_type to NID_undef.
567 loc = wolfSSL_X509_get_ext_by_NID(cert, NID_netscape_cert_type, -1);
570 WOLFSSL_X509_EXTENSION *ex = wolfSSL_X509_get_ext(cert, loc);
571 if (wolfSSL_BIO_puts(bio, "\ncert. type : ") <= 0)
573 log_ssl_errors(LOG_LEVEL_ERROR,
574 "wolfSSL_BIO_printf() for cert type failed");
578 if (!wolfSSL_X509V3_EXT_print(bio, ex, 0, 0))
580 if (!wolfSSL_ASN1_STRING_print_ex(bio,
581 wolfSSL_X509_EXTENSION_get_data(ex),
582 ASN1_STRFLGS_RFC2253))
584 log_ssl_errors(LOG_LEVEL_ERROR,
585 "wolfSSL_ASN1_STRING_print_ex() for cert type failed");
595 * This code compiles but does not work. wolfSSL_OBJ_obj2nid()
596 * triggers a 'X509V3_EXT_print not yet implemented for ext type' message.
598 loc = wolfSSL_X509_get_ext_by_NID(cert, NID_key_usage, -1);
601 WOLFSSL_X509_EXTENSION *extension = wolfSSL_X509_get_ext(cert, loc);
602 if (BIO_puts(bio, "\nkey usage : ") <= 0)
604 log_ssl_errors(LOG_LEVEL_ERROR,
605 "wolfSSL_BIO_printf() for key usage failed");
609 if (!wolfSSL_X509V3_EXT_print(bio, extension, 0, 0))
611 if (!wolfSSL_ASN1_STRING_print_ex(bio,
612 wolfSSL_X509_EXTENSION_get_data(extension),
613 ASN1_STRFLGS_RFC2253))
615 log_ssl_errors(LOG_LEVEL_ERROR,
616 "wolfSSL_ASN1_STRING_print_ex() for key usage failed");
626 * This compiles but doesn't work. wolfSSL_X509_ext_isSet_by_NID()
627 * complains about "NID not in table".
629 loc = wolfSSL_X509_get_ext_by_NID(cert, NID_ext_key_usage, -1);
631 WOLFSSL_X509_EXTENSION *ex = wolfSSL_X509_get_ext(cert, loc);
632 if (wolfSSL_BIO_puts(bio, "\next key usage : ") <= 0)
634 log_ssl_errors(LOG_LEVEL_ERROR,
635 "wolfSSL_BIO_printf() for ext key usage failed");
639 if (!wolfSSL_X509V3_EXT_print(bio, ex, 0, 0))
641 if (!wolfSSL_ASN1_STRING_print_ex(bio,
642 wolfSSL_X509_EXTENSION_get_data(ex),
643 ASN1_STRFLGS_RFC2253))
645 log_ssl_errors(LOG_LEVEL_ERROR,
646 "wolfSSL_ASN1_STRING_print_ex() for ext key usage failed");
656 * This compiles but doesn't work. wolfSSL_X509_ext_isSet_by_NID()
657 * complains about "NID not in table". XXX: again?
659 loc = wolfSSL_X509_get_ext_by_NID(cert, NID_certificate_policies, -1);
662 WOLFSSL_X509_EXTENSION *ex = wolfSSL_X509_get_ext(cert, loc);
663 if (wolfSSL_BIO_puts(bio, "\ncertificate policies : ") <= 0)
665 log_ssl_errors(LOG_LEVEL_ERROR,
666 "wolfSSL_BIO_printf() for certificate policies failed");
670 if (!wolfSSL_X509V3_EXT_print(bio, ex, 0, 0))
672 if (!wolfSSL_ASN1_STRING_print_ex(bio,
673 wolfSSL_X509_EXTENSION_get_data(ex),
674 ASN1_STRFLGS_RFC2253))
676 log_ssl_errors(LOG_LEVEL_ERROR,
677 "wolfSSL_ASN1_STRING_print_ex() for certificate policies failed");
685 /* make valgrind happy */
686 static const char zero = 0;
687 wolfSSL_BIO_write(bio, &zero, 1);
689 len = wolfSSL_BIO_get_mem_data(bio, &bio_mem_data);
692 log_error(LOG_LEVEL_ERROR, "BIO_get_mem_data() returned %ld "
693 "while gathering certificate information", len);
697 encoded_text = html_encode(bio_mem_data);
698 if (encoded_text == NULL)
700 log_error(LOG_LEVEL_ERROR,
701 "Failed to HTML-encode the certificate information");
706 strlcpy(last->info_buf, encoded_text, sizeof(last->info_buf));
713 wolfSSL_BIO_free(bio);
717 wolfSSL_EVP_PKEY_free(pkey);
723 /*********************************************************************
725 * Function : host_to_hash
727 * Description : Creates MD5 hash from host name. Host name is loaded
728 * from structure csp and saved again into it.
731 * 1 : csp = Current client state (buffers, headers, etc...)
733 * Returns : -1 => Error while creating hash
734 * 0 => Hash created successfully
736 *********************************************************************/
737 static int host_to_hash(struct client_state *csp)
743 ret = wc_InitMd5(&md5);
749 ret = wc_Md5Update(&md5, (const byte *)csp->http->host,
750 (word32)strlen(csp->http->host));
756 ret = wc_Md5Final(&md5, csp->http->hash_of_host);
764 /* Converting hash into string with hex */
765 for (i = 0; i < 16; i++)
767 ret = snprintf((char *)csp->http->hash_of_host_hex + 2 * i,
768 sizeof(csp->http->hash_of_host_hex) - 2 * i,
769 "%02x", csp->http->hash_of_host[i]);
772 log_error(LOG_LEVEL_ERROR, "sprintf() failed. Return value: %d", ret);
781 /*********************************************************************
783 * Function : create_client_ssl_connection
785 * Description : Creates a TLS-secured connection with the client.
788 * 1 : csp = Current client state (buffers, headers, etc...)
790 * Returns : 0 on success, negative value if connection wasn't created
793 *********************************************************************/
794 extern int create_client_ssl_connection(struct client_state *csp)
796 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
797 /* Paths to certificates file and key file */
798 char *key_file = NULL;
799 char *cert_file = NULL;
803 /* Should probably be called from somewhere else. */
807 * Preparing hash of host for creating certificates
809 ret = host_to_hash(csp);
812 log_error(LOG_LEVEL_ERROR, "Generating hash of host failed: %d", ret);
818 * Preparing paths to certificates files and key file
820 cert_file = make_certs_path(csp->config->certificate_directory,
821 (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
822 key_file = make_certs_path(csp->config->certificate_directory,
823 (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
825 if (cert_file == NULL || key_file == NULL)
831 /* Do we need to generate a new host certificate and key? */
832 if (!file_exists(cert_file) || !file_exists(key_file) ||
833 ssl_certificate_is_invalid(cert_file))
836 * Yes we do. Lock mutex to prevent certificate and
837 * key inconsistencies.
839 privoxy_mutex_lock(&certificate_mutex);
840 ret = generate_host_certificate(csp, cert_file, key_file);
841 privoxy_mutex_unlock(&certificate_mutex);
845 * No need to log something, generate_host_certificate()
852 ssl_attr->wolfssl_attr.ctx = wolfSSL_CTX_new(wolfSSLv23_method());
853 if (ssl_attr->wolfssl_attr.ctx == NULL)
855 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create TLS context");
860 /* Set the key and cert */
861 if (wolfSSL_CTX_use_certificate_file(ssl_attr->wolfssl_attr.ctx,
862 cert_file, SSL_FILETYPE_PEM) != WOLFSSL_SUCCESS)
864 log_ssl_errors(LOG_LEVEL_ERROR,
865 "Loading host certificate %s failed", cert_file);
870 if (wolfSSL_CTX_use_PrivateKey_file(ssl_attr->wolfssl_attr.ctx,
871 key_file, SSL_FILETYPE_PEM) != WOLFSSL_SUCCESS)
873 log_ssl_errors(LOG_LEVEL_ERROR,
874 "Loading host certificate private key %s failed", key_file);
879 wolfSSL_CTX_set_options(ssl_attr->wolfssl_attr.ctx, WOLFSSL_OP_NO_SSLv3);
881 ssl = ssl_attr->wolfssl_attr.ssl = wolfSSL_new(ssl_attr->wolfssl_attr.ctx);
883 if (wolfSSL_set_fd(ssl, csp->cfd) != WOLFSSL_SUCCESS)
885 log_ssl_errors(LOG_LEVEL_ERROR,
886 "wolfSSL_set_fd() failed to set the client socket");
891 if (csp->config->cipher_list != NULL)
893 if (!wolfSSL_set_cipher_list(ssl, csp->config->cipher_list))
895 log_ssl_errors(LOG_LEVEL_ERROR,
896 "Setting the cipher list '%s' for the client connection failed",
897 csp->config->cipher_list);
904 * Handshake with client
906 log_error(LOG_LEVEL_CONNECT,
907 "Performing the TLS/SSL handshake with client. Hash of host: %s",
908 csp->http->hash_of_host_hex);
910 ret = wolfSSL_accept(ssl);
911 if (ret == WOLFSSL_SUCCESS)
913 log_error(LOG_LEVEL_CONNECT,
914 "Client successfully connected over %s (%s).",
915 wolfSSL_get_version(ssl), wolfSSL_get_cipher_name(ssl));
916 csp->ssl_with_client_is_opened = 1;
922 int error = wolfSSL_get_error(ssl, ret);
923 log_error(LOG_LEVEL_ERROR,
924 "The TLS handshake with the client failed. error = %d, %s",
925 error, wolfSSL_ERR_error_string((unsigned long)error, buffer));
931 * Freeing allocated paths to files
936 /* Freeing structures if connection wasn't created successfully */
939 free_client_ssl_structures(csp);
945 /*********************************************************************
947 * Function : shutdown_connection
949 * Description : Shuts down a TLS connection if the socket is still
953 * 1 : csp = Current client state (buffers, headers, etc...)
957 *********************************************************************/
958 static void shutdown_connection(WOLFSSL *ssl, const char *type)
960 int shutdown_attempts = 0;
963 enum { MAX_SHUTDOWN_ATTEMPTS = 2 };
965 fd = wolfSSL_get_fd(ssl);
969 if (!socket_is_still_alive(fd))
971 log_error(LOG_LEVEL_CONNECT, "Not shutting down %s connection "
972 "on socket %d. The socket is no longer alive.", type, fd);
975 ret = wolfSSL_shutdown(ssl);
976 if (WOLFSSL_SUCCESS != ret)
979 log_error(LOG_LEVEL_CONNECT, "Failed to shutdown %s connection "
980 "on socket %d. Attempts so far: %d, ret: %d", type, fd,
981 shutdown_attempts, ret);
983 } while (ret == WOLFSSL_SHUTDOWN_NOT_DONE &&
984 shutdown_attempts < MAX_SHUTDOWN_ATTEMPTS);
985 if (WOLFSSL_SUCCESS != ret)
988 int error = wolfSSL_get_error(ssl, ret);
989 log_error(LOG_LEVEL_ERROR, "Failed to shutdown %s connection "
990 "on socket %d after %d attempts. ret: %d, error: %d, %s",
991 type, fd, shutdown_attempts, ret, error,
992 wolfSSL_ERR_error_string((unsigned long)error, buffer));
997 /*********************************************************************
999 * Function : close_client_ssl_connection
1001 * Description : Closes TLS connection with client. This function
1002 * checks if this connection is already created.
1005 * 1 : csp = Current client state (buffers, headers, etc...)
1009 *********************************************************************/
1010 extern void close_client_ssl_connection(struct client_state *csp)
1012 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
1014 if (csp->ssl_with_client_is_opened == 0)
1020 * Notify the peer that the connection is being closed.
1022 shutdown_connection(ssl_attr->wolfssl_attr.ssl, "client");
1024 free_client_ssl_structures(csp);
1025 csp->ssl_with_client_is_opened = 0;
1029 /*********************************************************************
1031 * Function : free_client_ssl_structures
1033 * Description : Frees structures used for SSL communication with
1037 * 1 : csp = Current client state (buffers, headers, etc...)
1041 *********************************************************************/
1042 static void free_client_ssl_structures(struct client_state *csp)
1044 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
1046 if (ssl_attr->wolfssl_attr.ssl)
1048 wolfSSL_free(ssl_attr->wolfssl_attr.ssl);
1050 if (ssl_attr->wolfssl_attr.ctx)
1052 wolfSSL_CTX_free(ssl_attr->wolfssl_attr.ctx);
1057 /*********************************************************************
1059 * Function : close_server_ssl_connection
1061 * Description : Closes TLS connection with server. This function
1062 * checks if this connection is already opened.
1065 * 1 : csp = Current client state (buffers, headers, etc...)
1069 *********************************************************************/
1070 extern void close_server_ssl_connection(struct client_state *csp)
1072 struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
1074 if (csp->ssl_with_server_is_opened == 0)
1080 * Notify the peer that the connection is being closed.
1082 shutdown_connection(ssl_attr->wolfssl_attr.ssl, "server");
1084 free_server_ssl_structures(csp);
1085 csp->ssl_with_server_is_opened = 0;
1089 /*********************************************************************
1091 * Function : create_server_ssl_connection
1093 * Description : Creates TLS-secured connection with the server.
1096 * 1 : csp = Current client state (buffers, headers, etc...)
1098 * Returns : 0 on success, negative value if connection wasn't created
1101 *********************************************************************/
1102 extern int create_server_ssl_connection(struct client_state *csp)
1104 wolfssl_connection_attr *ssl_attrs = &csp->ssl_server_attr.wolfssl_attr;
1107 int connect_ret = 0;
1109 csp->server_cert_verification_result = SSL_CERT_NOT_VERIFIED;
1110 csp->server_certs_chain.next = NULL;
1112 ssl_attrs->ctx = wolfSSL_CTX_new(wolfSSLv23_method());
1113 if (ssl_attrs->ctx == NULL)
1115 log_ssl_errors(LOG_LEVEL_ERROR, "TLS context creation failed");
1120 if (csp->dont_verify_certificate)
1122 wolfSSL_CTX_set_verify(ssl_attrs->ctx, WOLFSSL_VERIFY_NONE, NULL);
1124 else if (wolfSSL_CTX_load_verify_locations(ssl_attrs->ctx,
1125 csp->config->trusted_cas_file, NULL) != WOLFSSL_SUCCESS)
1127 log_ssl_errors(LOG_LEVEL_ERROR, "Loading trusted CAs file %s failed",
1128 csp->config->trusted_cas_file);
1133 wolfSSL_CTX_set_options(ssl_attrs->ctx, WOLFSSL_OP_NO_SSLv3);
1135 ssl = ssl_attrs->ssl = wolfSSL_new(ssl_attrs->ctx);
1137 if (wolfSSL_set_fd(ssl, csp->server_connection.sfd) != WOLFSSL_SUCCESS)
1139 log_ssl_errors(LOG_LEVEL_ERROR,
1140 "wolfSSL_set_fd() failed to set the server socket");
1145 if (csp->config->cipher_list != NULL)
1147 if (wolfSSL_set_cipher_list(ssl, csp->config->cipher_list) != WOLFSSL_SUCCESS)
1149 log_ssl_errors(LOG_LEVEL_ERROR,
1150 "Setting the cipher list '%s' for the server connection failed",
1151 csp->config->cipher_list);
1157 ret = wolfSSL_UseSNI(ssl, WOLFSSL_SNI_HOST_NAME,
1158 csp->http->host, (unsigned short)strlen(csp->http->host));
1159 if (ret != WOLFSSL_SUCCESS)
1161 log_ssl_errors(LOG_LEVEL_ERROR, "Failed to set use of SNI");
1166 ret = wolfSSL_check_domain_name(ssl, csp->http->host);
1167 if (ret != WOLFSSL_SUCCESS)
1170 int error = wolfSSL_get_error(ssl, ret);
1171 log_error(LOG_LEVEL_FATAL,
1172 "Failed to set check domain name. error = %d, %s",
1173 error, wolfSSL_ERR_error_string((unsigned long)error, buffer));
1178 #ifdef HAVE_SECURE_RENEGOTIATION
1179 #warning wolfssl has been compiled with HAVE_SECURE_RENEGOTIATION while you probably want HAVE_RENEGOTIATION_INDICATION
1180 if(wolfSSL_UseSecureRenegotiation(ssl) != WOLFSSL_SUCCESS)
1182 log_ssl_errors(LOG_LEVEL_ERROR,
1183 "Failed to enable 'Secure' Renegotiation. Continuing anyway.");
1186 #ifndef HAVE_RENEGOTIATION_INDICATION
1187 #warning Looks like wolfssl has been compiled without HAVE_RENEGOTIATION_INDICATION
1190 log_error(LOG_LEVEL_CONNECT,
1191 "Performing the TLS/SSL handshake with the server");
1193 /* wolfSSL_Debugging_ON(); */
1194 connect_ret = wolfSSL_connect(ssl);
1195 /* wolfSSL_Debugging_OFF(); */
1198 wolfSSL_Debugging_ON();
1200 if (!csp->dont_verify_certificate)
1202 long verify_result = wolfSSL_get_error(ssl, connect_ret);
1204 if (verify_result == WOLFSSL_X509_V_OK)
1207 csp->server_cert_verification_result = SSL_CERT_VALID;
1211 WOLF_STACK_OF(WOLFSSL_X509) *chain;
1213 csp->server_cert_verification_result = verify_result;
1214 log_error(LOG_LEVEL_ERROR,
1215 "X509 certificate verification for %s failed with error %ld: %s",
1216 csp->http->hostport, verify_result,
1217 wolfSSL_X509_verify_cert_error_string(verify_result));
1219 chain = wolfSSL_get_peer_cert_chain(ssl);
1223 for (i = 0; i < wolfSSL_sk_X509_num(chain); i++)
1225 if (ssl_store_cert(csp, wolfSSL_sk_X509_value(chain, i)) != 0)
1227 log_error(LOG_LEVEL_ERROR,
1228 "ssl_store_cert() failed for cert %d", i);
1230 * ssl_send_certificate_error() wil not be able to show
1231 * the certificate but the user will stil get the error
1243 wolfSSL_Debugging_OFF();
1245 if (connect_ret == WOLFSSL_SUCCESS)
1247 log_error(LOG_LEVEL_CONNECT,
1248 "Server successfully connected over %s (%s).",
1249 wolfSSL_get_version(ssl), wolfSSL_get_cipher_name(ssl));
1250 csp->ssl_with_server_is_opened = 1;
1256 int error = wolfSSL_get_error(ssl, ret);
1257 log_error(LOG_LEVEL_ERROR,
1258 "The TLS handshake with the server %s failed. error = %d, %s",
1259 csp->http->hostport,
1260 error, wolfSSL_ERR_error_string((unsigned long)error, buffer));
1265 /* Freeing structures if connection wasn't created successfully */
1268 free_server_ssl_structures(csp);
1275 /*********************************************************************
1277 * Function : free_server_ssl_structures
1279 * Description : Frees structures used for SSL communication with server
1282 * 1 : csp = Current client state (buffers, headers, etc...)
1286 *********************************************************************/
1287 static void free_server_ssl_structures(struct client_state *csp)
1289 struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
1291 if (ssl_attr->wolfssl_attr.ssl)
1293 wolfSSL_free(ssl_attr->wolfssl_attr.ssl);
1295 if (ssl_attr->wolfssl_attr.ctx)
1297 wolfSSL_CTX_free(ssl_attr->wolfssl_attr.ctx);
1302 /*********************************************************************
1304 * Function : log_ssl_errors
1306 * Description : Log SSL errors
1309 * 1 : debuglevel = Debug level
1310 * 2 : desc = Error description
1314 *********************************************************************/
1315 static void log_ssl_errors(int debuglevel, const char* fmt, ...)
1317 unsigned long err_code;
1318 char prefix[ERROR_BUF_SIZE];
1320 va_start(args, fmt);
1321 vsnprintf(prefix, sizeof(prefix), fmt, args);
1324 while ((err_code = wolfSSL_ERR_get_error()))
1326 char err_buf[ERROR_BUF_SIZE];
1328 wolfSSL_ERR_error_string_n(err_code, err_buf, sizeof(err_buf));
1329 log_error(debuglevel, "%s: %s", prefix, err_buf);
1333 * In case if called by mistake and there were
1334 * no TLS errors let's report it to the log.
1338 log_error(debuglevel, "%s: no TLS errors detected", prefix);
1343 /*********************************************************************
1345 * Function : ssl_base64_encode
1347 * Description : Encode a buffer into base64 format.
1350 * 1 : dst = Destination buffer
1351 * 2 : dlen = Destination buffer length
1352 * 3 : olen = Number of bytes written
1353 * 4 : src = Source buffer
1354 * 5 : slen = Amount of data to be encoded
1356 * Returns : 0 on success, error code othervise
1358 *********************************************************************/
1359 extern int ssl_base64_encode(unsigned char *dst, size_t dlen, size_t *olen,
1360 const unsigned char *src, size_t slen)
1362 word32 output_length;
1365 *olen = 4 * ((slen/3) + ((slen%3) ? 1 : 0)) + 1;
1371 output_length = (word32)dlen;
1372 ret = Base64_Encode_NoNl(src, (word32)slen, dst, &output_length);
1375 log_error(LOG_LEVEL_ERROR, "base64 encoding failed with %d", ret);
1378 *olen = output_length;
1385 /*********************************************************************
1387 * Function : close_file_stream
1389 * Description : Close file stream, report error on close error
1392 * 1 : f = file stream to close
1393 * 2 : path = path for error report
1397 *********************************************************************/
1398 static void close_file_stream(FILE *f, const char *path)
1402 log_error(LOG_LEVEL_ERROR,
1403 "Error closing file %s: %s", path, strerror(errno));
1408 /*********************************************************************
1410 * Function : write_certificate
1412 * Description : Writes a PEM-encoded certificate to a file.
1415 * 1 : certificate_path = Path to the file to create
1416 * 2 : certificate = PEM-encoded certificate to write.
1418 * Returns : NULL => Error. Otherwise a key;
1420 *********************************************************************/
1421 static int write_certificate(const char *certificate_path, const char *certificate)
1425 assert(certificate_path != NULL);
1426 assert(certificate != NULL);
1428 fp = fopen(certificate_path, "wb");
1431 log_error(LOG_LEVEL_ERROR,
1432 "Failed to open %s to write the certificate: %E",
1436 if (fputs(certificate, fp) < 0)
1438 log_error(LOG_LEVEL_ERROR, "Failed to write certificate to %s: %E",
1450 /*********************************************************************
1452 * Function : generate_rsa_key
1454 * Description : Generates a new RSA key and saves it in a file.
1457 * 1 : rsa_key_path = Path to the key that should be written.
1459 * Returns : -1 => Error while generating private key
1462 *********************************************************************/
1463 static int generate_rsa_key(const char *rsa_key_path)
1466 byte rsa_key_der[4096];
1473 assert(file_exists(rsa_key_path) != 1);
1475 wc_InitRsaKey(&rsa_key, NULL);
1477 log_error(LOG_LEVEL_CONNECT, "Making RSA key %s ...", rsa_key_path);
1478 ret = wc_MakeRsaKey(&rsa_key, RSA_KEYSIZE, RSA_KEY_PUBLIC_EXPONENT,
1482 log_error(LOG_LEVEL_ERROR, "RSA key generation failed");
1486 log_error(LOG_LEVEL_CONNECT, "Done making RSA key %s", rsa_key_path);
1488 der_key_size = wc_RsaKeyToDer(&rsa_key, rsa_key_der, sizeof(rsa_key_der));
1489 wc_FreeRsaKey(&rsa_key);
1490 if (der_key_size < 0)
1492 log_error(LOG_LEVEL_ERROR, "RSA key conversion to DER format failed");
1496 pem_key_size = wc_DerToPem(rsa_key_der, (word32)der_key_size,
1497 key_pem, sizeof(key_pem), PRIVATEKEY_TYPE);
1498 if (pem_key_size < 0)
1500 log_error(LOG_LEVEL_ERROR, "RSA key conversion to PEM format failed");
1506 * Saving key into file
1508 if ((f = fopen(rsa_key_path, "wb")) == NULL)
1510 log_error(LOG_LEVEL_ERROR,
1511 "Opening file %s to save private key failed: %E",
1517 if (fwrite(key_pem, 1, (size_t)pem_key_size, f) != pem_key_size)
1519 log_error(LOG_LEVEL_ERROR,
1520 "Writing private key into file %s failed",
1522 close_file_stream(f, rsa_key_path);
1527 close_file_stream(f, rsa_key_path);
1536 /*********************************************************************
1538 * Function : ssl_certificate_load
1540 * Description : Loads certificate from file.
1543 * 1 : cert_path = The certificate path to load
1545 * Returns : NULL => error loading certificate,
1546 * pointer to certificate instance otherwise
1548 *********************************************************************/
1549 static X509 *ssl_certificate_load(const char *cert_path)
1552 FILE *cert_f = NULL;
1554 if (!(cert_f = fopen(cert_path, "r")))
1556 log_error(LOG_LEVEL_ERROR,
1557 "Error opening certificate file %s: %s", cert_path, strerror(errno));
1561 if (!(cert = PEM_read_X509(cert_f, NULL, NULL, NULL)))
1563 log_ssl_errors(LOG_LEVEL_ERROR,
1564 "Error reading certificate file %s", cert_path);
1567 close_file_stream(cert_f, cert_path);
1572 /*********************************************************************
1574 * Function : ssl_certificate_is_invalid
1576 * Description : Checks whether or not a certificate is valid.
1577 * Currently only checks that the certificate can be
1578 * parsed and that the "valid to" date is in the future.
1581 * 1 : cert_file = The certificate to check
1583 * Returns : 0 => The certificate is valid.
1584 * 1 => The certificate is invalid
1586 *********************************************************************/
1587 static int ssl_certificate_is_invalid(const char *cert_file)
1593 if (!(cert = ssl_certificate_load(cert_file)))
1598 ret = wolfSSL_X509_cmp_current_time(wolfSSL_X509_get_notAfter(cert));
1601 log_ssl_errors(LOG_LEVEL_ERROR,
1602 "Error checking certificate %s validity", cert_file);
1606 wolfSSL_X509_free(cert);
1608 return ret == -1 ? 1 : 0;
1612 /*********************************************************************
1614 * Function : load_rsa_key
1616 * Description : Load a PEM-encoded RSA file into memory.
1619 * 1 : rsa_key_path = Path to the file that holds the key.
1620 * 2 : password = Password to unlock the key. NULL if no
1621 * password is required.
1622 * 3 : rsa_key = Initialized RSA key storage.
1624 * Returns : 0 => Error while creating the key.
1627 *********************************************************************/
1628 static int load_rsa_key(const char *rsa_key_path, const char *password, RsaKey *rsa_key)
1633 unsigned char *key_pem;
1634 DerBuffer *der_buffer;
1635 word32 der_index = 0;
1636 DerBuffer decrypted_der_buffer;
1637 unsigned char der_data[4096];
1639 fp = fopen(rsa_key_path, "rb");
1642 log_error(LOG_LEVEL_ERROR, "Failed to open %s: %E", rsa_key_path);
1646 /* Get file length */
1647 if (fseek(fp, 0, SEEK_END))
1649 log_error(LOG_LEVEL_ERROR,
1650 "Unexpected error while fseek()ing to the end of %s: %E",
1658 log_error(LOG_LEVEL_ERROR,
1659 "Unexpected ftell() error while loading %s: %E",
1664 length = (size_t)ret;
1666 /* Go back to the beginning. */
1667 if (fseek(fp, 0, SEEK_SET))
1669 log_error(LOG_LEVEL_ERROR,
1670 "Unexpected error while fseek()ing to the beginning of %s: %E",
1676 key_pem = malloc_or_die(length);
1678 if (1 != fread(key_pem, length, 1, fp))
1680 log_error(LOG_LEVEL_ERROR,
1681 "Couldn't completely read file %s.", rsa_key_path);
1689 if (password == NULL)
1691 ret = wc_PemToDer(key_pem, (long)length, PRIVATEKEY_TYPE,
1692 &der_buffer, NULL, NULL, NULL);
1696 der_buffer = &decrypted_der_buffer;
1697 der_buffer->buffer = der_data;
1698 ret = wc_KeyPemToDer(key_pem, (int)length, der_buffer->buffer,
1699 sizeof(der_data), password);
1702 log_error(LOG_LEVEL_ERROR,
1703 "Failed to convert PEM key %s into DER format. Error: %ld",
1708 der_buffer->length = (word32)ret;
1715 log_error(LOG_LEVEL_ERROR,
1716 "Failed to convert buffer into DER format for file %s. Error = %ld",
1721 ret = wc_RsaPrivateKeyDecode(der_buffer->buffer, &der_index, rsa_key,
1722 der_buffer->length);
1723 if (password == NULL)
1729 log_error(LOG_LEVEL_ERROR,
1730 "Failed to decode DER buffer into RSA key structure for %s",
1738 #ifndef WOLFSSL_ALT_NAMES
1739 #error wolfSSL lacks Subject Alternative Name support (WOLFSSL_ALT_NAMES) which is mandatory
1741 /*********************************************************************
1743 * Function : set_subject_alternative_name
1745 * Description : Sets the Subject Alternative Name extension to
1746 * a cert using the awesome "API" provided by wolfSSL.
1749 * 1 : cert = The certificate to modify
1750 * 2 : hostname = The hostname to add
1752 * Returns : <0 => Error.
1755 *********************************************************************/
1756 static int set_subject_alternative_name(struct Cert *certificate, const char *hostname)
1758 const size_t hostname_length = strlen(hostname);
1760 if (hostname_length >= 253)
1763 * We apparently only have a byte to represent the length
1766 log_error(LOG_LEVEL_ERROR,
1767 "Hostname '%s' is too long to set Subject Alternative Name",
1771 certificate->altNames[0] = 0x30; /* Sequence */
1772 certificate->altNames[1] = (unsigned char)hostname_length + 2;
1774 certificate->altNames[2] = 0x82; /* DNS name */
1775 certificate->altNames[3] = (unsigned char)hostname_length;
1776 memcpy(&certificate->altNames[4], hostname, hostname_length);
1778 certificate->altNamesSz = (int)hostname_length + 4;
1784 /*********************************************************************
1786 * Function : generate_host_certificate
1788 * Description : Creates certificate file in presetted directory.
1789 * If certificate already exists, no other certificate
1790 * will be created. Subject of certificate is named
1791 * by csp->http->host from parameter. This function also
1792 * triggers generating of private key for new certificate.
1795 * 1 : csp = Current client state (buffers, headers, etc...)
1796 * 2 : certificate_path = Path to the certficate to generate.
1797 * 3 : rsa_key_path = Path to the key to generate for the
1800 * Returns : -1 => Error while creating certificate.
1801 * 0 => Certificate already exists.
1802 * 1 => Certificate created
1804 *********************************************************************/
1805 static int generate_host_certificate(struct client_state *csp,
1806 const char *certificate_path, const char *rsa_key_path)
1808 struct Cert certificate;
1812 byte certificate_der[4096];
1813 int der_certificate_length;
1814 byte certificate_pem[4096];
1815 int pem_certificate_length;
1817 if (file_exists(certificate_path) == 1)
1819 /* The file exists, but is it valid? */
1820 if (ssl_certificate_is_invalid(certificate_path))
1822 log_error(LOG_LEVEL_CONNECT,
1823 "Certificate %s is no longer valid. Removing it.",
1825 if (unlink(certificate_path))
1827 log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
1831 if (unlink(rsa_key_path))
1833 log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
1845 log_error(LOG_LEVEL_CONNECT, "Creating new certificate %s",
1848 if (enforce_sane_certificate_state(certificate_path, rsa_key_path))
1853 wc_InitRsaKey(&rsa_key, NULL);
1854 wc_InitRsaKey(&ca_key, NULL);
1856 if (generate_rsa_key(rsa_key_path) == -1)
1861 wc_InitCert(&certificate);
1863 strncpy(certificate.subject.country, CERT_PARAM_COUNTRY_CODE, CTC_NAME_SIZE);
1864 strncpy(certificate.subject.org, "Privoxy", CTC_NAME_SIZE);
1865 strncpy(certificate.subject.unit, "Development", CTC_NAME_SIZE);
1866 strncpy(certificate.subject.commonName, csp->http->host, CTC_NAME_SIZE);
1867 certificate.daysValid = 90;
1868 certificate.selfSigned = 0;
1869 certificate.sigType = CTC_SHA256wRSA;
1870 if (!host_is_ip_address(csp->http->host) &&
1871 set_subject_alternative_name(&certificate, csp->http->host))
1877 ret = wc_SetIssuer(&certificate, csp->config->ca_cert_file);
1880 log_error(LOG_LEVEL_ERROR,
1881 "Failed to set Issuer file %s", csp->config->ca_cert_file);
1886 if (load_rsa_key(rsa_key_path, NULL, &rsa_key) != 1)
1888 log_error(LOG_LEVEL_ERROR,
1889 "Failed to load RSA key %s", rsa_key_path);
1894 /* wolfSSL_Debugging_ON(); */
1895 der_certificate_length = wc_MakeCert(&certificate, certificate_der,
1896 sizeof(certificate_der), &rsa_key, NULL, &wolfssl_rng);
1897 /* wolfSSL_Debugging_OFF(); */
1899 if (der_certificate_length < 0)
1901 log_error(LOG_LEVEL_ERROR, "Failed to make certificate");
1906 if (load_rsa_key(csp->config->ca_key_file, csp->config->ca_password,
1909 log_error(LOG_LEVEL_ERROR,
1910 "Failed to load CA key %s", csp->config->ca_key_file);
1915 der_certificate_length = wc_SignCert(certificate.bodySz, certificate.sigType,
1916 certificate_der, sizeof(certificate_der), &ca_key, NULL, &wolfssl_rng);
1917 wc_FreeRsaKey(&ca_key);
1918 if (der_certificate_length < 0)
1920 log_error(LOG_LEVEL_ERROR, "Failed to sign certificate");
1925 pem_certificate_length = wc_DerToPem(certificate_der,
1926 (word32)der_certificate_length, certificate_pem,
1927 sizeof(certificate_pem), CERT_TYPE);
1928 if (pem_certificate_length < 0)
1930 log_error(LOG_LEVEL_ERROR,
1931 "Failed to convert certificate from DER to PEM");
1935 certificate_pem[pem_certificate_length] = '\0';
1937 if (write_certificate(certificate_path, (const char*)certificate_pem))
1946 wc_FreeRsaKey(&rsa_key);
1947 wc_FreeRsaKey(&ca_key);
1954 /*********************************************************************
1956 * Function : ssl_crt_verify_info
1958 * Description : Returns an informational string about the verification
1959 * status of a certificate.
1962 * 1 : buf = Buffer to write to
1963 * 2 : size = Maximum size of buffer
1964 * 3 : csp = client state
1968 *********************************************************************/
1969 extern void ssl_crt_verify_info(char *buf, size_t size, struct client_state *csp)
1971 strncpy(buf, wolfSSL_X509_verify_cert_error_string(
1972 csp->server_cert_verification_result), size);
1977 #ifdef FEATURE_GRACEFUL_TERMINATION
1978 /*********************************************************************
1980 * Function : ssl_release
1982 * Description : Release all SSL resources
1988 *********************************************************************/
1989 extern void ssl_release(void)
1991 if (wolfssl_initialized == 1)
1993 wc_FreeRng(&wolfssl_rng);
1997 #endif /* def FEATURE_GRACEFUL_TERMINATION */