1 /*********************************************************************
5 * Purpose : File with TLS/SSL extension. Contains methods for
6 * creating, using and closing TLS/SSL connections.
8 * Copyright : Written by and Copyright (c) 2020 Maxim Antonov <mantonov@gmail.com>
9 * Copyright (C) 2017 Vaclav Svec. FIT CVUT.
10 * Copyright (C) 2018-2020 by Fabian Keil <fk@fabiankeil.de>
12 * This program is free software; you can redistribute it
13 * and/or modify it under the terms of the GNU General
14 * Public License as published by the Free Software
15 * Foundation; either version 2 of the License, or (at
16 * your option) any later version.
18 * This program is distributed in the hope that it will
19 * be useful, but WITHOUT ANY WARRANTY; without even the
20 * implied warranty of MERCHANTABILITY or FITNESS FOR A
21 * PARTICULAR PURPOSE. See the GNU General Public
22 * License for more details.
24 * The GNU General Public License should be included with
25 * this file. If not, you can view it at
26 * http://www.gnu.org/copyleft/gpl.html
27 * or write to the Free Software Foundation, Inc., 59
28 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
30 *********************************************************************/
35 #include <openssl/bn.h>
36 #include <openssl/opensslv.h>
37 #include <openssl/pem.h>
38 #include <openssl/md5.h>
39 #include <openssl/x509v3.h>
48 #include "ssl_common.h"
51 * Macros for openssl.c
53 #define CERTIFICATE_BASIC_CONSTRAINTS "CA:FALSE"
54 #define CERTIFICATE_SUBJECT_KEY "hash"
55 #define CERTIFICATE_AUTHORITY_KEY "keyid:always"
56 #define CERTIFICATE_ALT_NAME_PREFIX "DNS:"
57 #define CERTIFICATE_VERSION 2
58 #define VALID_DATETIME_FMT "%Y%m%d%H%M%SZ"
59 #define VALID_DATETIME_BUFLEN 16
61 static int generate_webpage_certificate(struct client_state *csp);
62 static void free_client_ssl_structures(struct client_state *csp);
63 static void free_server_ssl_structures(struct client_state *csp);
64 static int ssl_store_cert(struct client_state *csp, X509* crt);
65 static void log_ssl_errors(int debuglevel, const char* fmt, ...) __attribute__((format(printf, 2, 3)));
67 static int ssl_inited = 0;
69 /*********************************************************************
71 * Function : openssl_init
73 * Description : Initializes OpenSSL library once
79 *********************************************************************/
80 static void openssl_init(void)
84 privoxy_mutex_lock(&ssl_init_mutex);
87 #if OPENSSL_VERSION_NUMBER < 0x10100000L
90 OPENSSL_init_ssl(0, NULL);
92 SSL_load_error_strings();
93 OpenSSL_add_ssl_algorithms();
96 privoxy_mutex_unlock(&ssl_init_mutex);
101 /*********************************************************************
103 * Function : is_ssl_pending
105 * Description : Tests if there are some waiting data on ssl connection.
106 * Only considers data that has actually been received
107 * locally and ignores data that is still on the fly
108 * or has not yet been sent by the remote end.
111 * 1 : ssl_attr = SSL context to test
113 * Returns : 0 => No data are pending
114 * >0 => Pending data length
116 *********************************************************************/
117 extern size_t is_ssl_pending(struct ssl_attr *ssl_attr)
119 BIO *bio = ssl_attr->openssl_attr.bio;
125 return (size_t)BIO_pending(bio);
129 /*********************************************************************
131 * Function : ssl_send_data
133 * Description : Sends the content of buf (for n bytes) to given SSL
134 * connection context.
137 * 1 : ssl_attr = SSL context to send data to
138 * 2 : buf = Pointer to data to be sent
139 * 3 : len = Length of data to be sent to the SSL context
141 * Returns : Length of sent data or negative value on error.
143 *********************************************************************/
144 extern int ssl_send_data(struct ssl_attr *ssl_attr, const unsigned char *buf, size_t len)
146 BIO *bio = ssl_attr->openssl_attr.bio;
148 int pos = 0; /* Position of unsent part in buffer */
157 int send_len = (int)len - pos;
159 log_error(LOG_LEVEL_WRITING, "TLS: %N", send_len, buf+pos);
162 * Sending one part of the buffer
164 while ((ret = BIO_write(bio,
165 (const unsigned char *)(buf + pos),
168 if (!BIO_should_retry(bio))
170 log_ssl_errors(LOG_LEVEL_ERROR,
171 "Sending data over TLS/SSL failed");
175 /* Adding count of sent bytes to position in buffer */
183 /*********************************************************************
185 * Function : ssl_recv_data
187 * Description : Receives data from given SSL context and puts
191 * 1 : ssl_attr = SSL context to receive data from
192 * 2 : buf = Pointer to buffer where data will be written
193 * 3 : max_length = Maximum number of bytes to read
195 * Returns : Number of bytes read, 0 for EOF, or -1
198 *********************************************************************/
199 extern int ssl_recv_data(struct ssl_attr *ssl_attr, unsigned char *buf, size_t max_length)
201 BIO *bio = ssl_attr->openssl_attr.bio;
203 memset(buf, 0, max_length);
206 * Receiving data from SSL context into buffer
210 ret = BIO_read(bio, buf, (int)max_length);
211 } while (ret <= 0 && BIO_should_retry(bio));
215 log_ssl_errors(LOG_LEVEL_ERROR,
216 "Receiving data over TLS/SSL failed");
221 log_error(LOG_LEVEL_RECEIVED, "TLS: %N", ret, buf);
227 /*********************************************************************
229 * Function : ssl_store_cert
231 * Description : This is a callback function for certificate verification.
232 * It's called once for each certificate in the server's
233 * certificate trusted chain and prepares information about
234 * the certificate. The information can be used to inform
235 * the user about invalid certificates.
238 * 1 : csp = Current client state (buffers, headers, etc...)
239 * 2 : crt = certificate from trusted chain
241 * Returns : 0 on success and negative value on error
243 *********************************************************************/
244 static int ssl_store_cert(struct client_state *csp, X509* crt)
247 struct certs_chain *last = &(csp->server_certs_chain);
249 BIO *bio = BIO_new(BIO_s_mem());
250 EVP_PKEY *pkey = NULL;
251 char *bio_mem_data = 0;
254 const ASN1_INTEGER *bs;
255 const X509_ALGOR *tsig_alg;
260 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new_mem_buf() failed");
265 * Searching for last item in certificates linked list
267 while (last->next != NULL)
273 * Preparing next item in linked list for next certificate
275 last->next = malloc_or_die(sizeof(struct certs_chain));
276 last->next->next = NULL;
277 memset(last->next->info_buf, 0, sizeof(last->next->info_buf));
278 memset(last->next->file_buf, 0, sizeof(last->next->file_buf));
281 * Saving certificate file into buffer
283 if (!PEM_write_bio_X509(bio, crt))
285 log_ssl_errors(LOG_LEVEL_ERROR, "PEM_write_X509() failed");
290 len = BIO_get_mem_data(bio, &bio_mem_data);
292 if (len > (sizeof(last->file_buf) - 1))
294 log_error(LOG_LEVEL_ERROR,
295 "X509 PEM cert len %d is larger then buffer len %s",
296 len, sizeof(last->file_buf) - 1);
297 len = sizeof(last->file_buf) - 1;
300 strncpy(last->file_buf, bio_mem_data, (size_t)len);
302 bio = BIO_new(BIO_s_mem());
305 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new_mem_buf() failed");
311 * Saving certificate information into buffer
313 l = X509_get_version(crt);
314 if (l >= 0 && l <= 2)
316 if (BIO_printf(bio, "cert. version : %ld\n", l + 1) <= 0)
318 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for version failed");
325 if (BIO_printf(bio, "cert. version : Unknown (%ld)\n", l) <= 0)
327 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for version failed");
333 if (BIO_puts(bio, "serial number : ") <= 0)
335 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_write() for serial failed");
339 bs = X509_get0_serialNumber(crt);
340 if (bs->length <= (int)sizeof(long))
343 l = ASN1_INTEGER_get(bs);
354 if (bs->type == V_ASN1_NEG_INTEGER)
356 ul = 0 - (unsigned long)l;
361 ul = (unsigned long)l;
364 if (BIO_printf(bio, " %s%lu (%s0x%lx)\n", neg, ul, neg, ul) <= 0)
366 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for serial failed");
373 if (bs->type == V_ASN1_NEG_INTEGER)
375 if (BIO_puts(bio, " (Negative)") < 0)
377 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for serial failed");
382 for (int i = 0; i < bs->length; i++)
384 if (BIO_printf(bio, "%02x%c", bs->data[i],
385 ((i + 1 == bs->length) ? '\n' : ':')) <= 0)
387 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for serial failed");
394 if (BIO_puts(bio, "issuer name : ") <= 0)
396 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for issuer failed");
400 if (X509_NAME_print_ex(bio, X509_get_issuer_name(crt), 0, 0) < 0)
402 log_ssl_errors(LOG_LEVEL_ERROR, "X509_NAME_print_ex() for issuer failed");
407 if (BIO_puts(bio, "\nsubject name : ") <= 0)
409 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for sublect failed");
413 if (X509_NAME_print_ex(bio, X509_get_subject_name(crt), 0, 0) < 0) {
414 log_ssl_errors(LOG_LEVEL_ERROR, "X509_NAME_print_ex() for subject failed");
419 if (BIO_puts(bio, "\nissued on : ") <= 0)
421 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for issued on failed");
425 if (!ASN1_TIME_print(bio, X509_get0_notBefore(crt)))
427 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_TIME_print() for issued on failed");
432 if (BIO_puts(bio, "\nexpires on : ") <= 0)
434 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for expires on failed");
438 if (!ASN1_TIME_print(bio, X509_get0_notAfter(crt)))
440 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_TIME_print() for expires on failed");
445 if (BIO_puts(bio, "\nsigned using : ") <= 0)
447 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for signed using failed");
451 tsig_alg = X509_get0_tbs_sigalg(crt);
452 if (!i2a_ASN1_OBJECT(bio, tsig_alg->algorithm))
454 log_ssl_errors(LOG_LEVEL_ERROR, "i2a_ASN1_OBJECT() for signed using on failed");
458 pkey = X509_get_pubkey(crt);
461 log_ssl_errors(LOG_LEVEL_ERROR, "X509_get_pubkey() failed");
466 switch (EVP_PKEY_base_id(pkey))
469 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "RSA key size", EVP_PKEY_bits(pkey));
472 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "DSA key size", EVP_PKEY_bits(pkey));
475 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "non-RSA/DSA key size", EVP_PKEY_bits(pkey));
480 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for key size failed");
485 loc = X509_get_ext_by_NID(crt, NID_basic_constraints, -1);
488 X509_EXTENSION *ex = X509_get_ext(crt, loc);
489 if (BIO_puts(bio, "\nbasic constraints : ") <= 0)
491 log_ssl_errors(LOG_LEVEL_ERROR,
492 "BIO_printf() for basic constraints failed");
496 if (!X509V3_EXT_print(bio, ex, 0, 0))
498 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex), ASN1_STRFLGS_RFC2253))
500 log_ssl_errors(LOG_LEVEL_ERROR,
501 "ASN1_STRING_print_ex() for basic constraints failed");
508 loc = X509_get_ext_by_NID(crt, NID_subject_alt_name, -1);
511 X509_EXTENSION *ex = X509_get_ext(crt, loc);
512 if (BIO_puts(bio, "\nsubject alt name : ") <= 0)
514 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for alt name failed");
518 if (!X509V3_EXT_print(bio, ex, 0, 0))
520 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
521 ASN1_STRFLGS_RFC2253))
523 log_ssl_errors(LOG_LEVEL_ERROR,
524 "ASN1_STRING_print_ex() for alt name failed");
531 loc = X509_get_ext_by_NID(crt, NID_netscape_cert_type, -1);
534 X509_EXTENSION *ex = X509_get_ext(crt, loc);
535 if (BIO_puts(bio, "\ncert. type : ") <= 0)
537 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for cert type failed");
541 if (!X509V3_EXT_print(bio, ex, 0, 0))
543 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
544 ASN1_STRFLGS_RFC2253))
546 log_ssl_errors(LOG_LEVEL_ERROR,
547 "ASN1_STRING_print_ex() for cert type failed");
554 loc = X509_get_ext_by_NID(crt, NID_key_usage, -1);
557 X509_EXTENSION *ex = X509_get_ext(crt, loc);
558 if (BIO_puts(bio, "\nkey usage : ") <= 0)
560 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for key usage failed");
564 if (!X509V3_EXT_print(bio, ex, 0, 0))
566 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
567 ASN1_STRFLGS_RFC2253))
569 log_ssl_errors(LOG_LEVEL_ERROR,
570 "ASN1_STRING_print_ex() for key usage failed");
577 loc = X509_get_ext_by_NID(crt, NID_ext_key_usage, -1);
579 X509_EXTENSION *ex = X509_get_ext(crt, loc);
580 if (BIO_puts(bio, "\next key usage : ") <= 0)
582 log_ssl_errors(LOG_LEVEL_ERROR,
583 "BIO_printf() for ext key usage failed");
587 if (!X509V3_EXT_print(bio, ex, 0, 0))
589 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
590 ASN1_STRFLGS_RFC2253))
592 log_ssl_errors(LOG_LEVEL_ERROR,
593 "ASN1_STRING_print_ex() for ext key usage failed");
600 loc = X509_get_ext_by_NID(crt, NID_certificate_policies, -1);
603 X509_EXTENSION *ex = X509_get_ext(crt, loc);
604 if (BIO_puts(bio, "\ncertificate policies : ") <= 0)
606 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for certificate policies failed");
610 if (!X509V3_EXT_print(bio, ex, 0, 0))
612 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
613 ASN1_STRFLGS_RFC2253))
615 log_ssl_errors(LOG_LEVEL_ERROR,
616 "ASN1_STRING_print_ex() for certificate policies failed");
623 /* make valgrind happy */
624 static const char zero = 0;
625 BIO_write(bio, &zero, 1);
627 len = BIO_get_mem_data(bio, &bio_mem_data);
628 encoded_text = html_encode(bio_mem_data);
629 strlcpy(last->info_buf, encoded_text, sizeof(last->info_buf));
646 /*********************************************************************
648 * Function : host_to_hash
650 * Description : Creates MD5 hash from host name. Host name is loaded
651 * from structure csp and saved again into it.
654 * 1 : csp = Current client state (buffers, headers, etc...)
656 * Returns : 1 => Error while creating hash
657 * 0 => Hash created successfully
659 *********************************************************************/
660 static int host_to_hash(struct client_state *csp)
664 memset(csp->http->hash_of_host, 0, sizeof(csp->http->hash_of_host));
665 MD5((unsigned char *)csp->http->host, strlen(csp->http->host),
666 csp->http->hash_of_host);
668 /* Converting hash into string with hex */
672 if ((ret = sprintf((char *)csp->http->hash_of_host_hex + 2 * i, "%02x",
673 csp->http->hash_of_host[i])) < 0)
675 log_error(LOG_LEVEL_ERROR, "Sprintf return value: %d", ret);
684 /*********************************************************************
686 * Function : create_client_ssl_connection
688 * Description : Creates TLS/SSL secured connection with client
691 * 1 : csp = Current client state (buffers, headers, etc...)
693 * Returns : 0 on success, negative value if connection wasn't created
696 *********************************************************************/
697 extern int create_client_ssl_connection(struct client_state *csp)
699 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
700 /* Paths to certificates file and key file */
701 char *key_file = NULL;
702 char *ca_file = NULL;
703 char *cert_file = NULL;
708 * Initializing OpenSSL structures for TLS/SSL connection
713 * Preparing hash of host for creating certificates
715 ret = host_to_hash(csp);
718 log_error(LOG_LEVEL_ERROR, "Generating hash of host failed: %d", ret);
724 * Preparing paths to certificates files and key file
726 ca_file = csp->config->ca_cert_file;
727 cert_file = make_certs_path(csp->config->certificate_directory,
728 (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
729 key_file = make_certs_path(csp->config->certificate_directory,
730 (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
732 if (cert_file == NULL || key_file == NULL)
739 * Generating certificate for requested host. Mutex to prevent
740 * certificate and key inconsistence must be locked.
742 privoxy_mutex_lock(&certificate_mutex);
744 ret = generate_webpage_certificate(csp);
747 log_error(LOG_LEVEL_ERROR,
748 "Generate_webpage_certificate failed: %d", ret);
749 privoxy_mutex_unlock(&certificate_mutex);
753 privoxy_mutex_unlock(&certificate_mutex);
755 if (!(ssl_attr->openssl_attr.ctx = SSL_CTX_new(SSLv23_server_method())))
757 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create SSL context");
762 /* Set the key and cert */
763 if (SSL_CTX_use_certificate_file(ssl_attr->openssl_attr.ctx,
764 cert_file, SSL_FILETYPE_PEM) != 1)
766 log_ssl_errors(LOG_LEVEL_ERROR,
767 "Loading webpage certificate %s failed", cert_file);
772 if (SSL_CTX_use_PrivateKey_file(ssl_attr->openssl_attr.ctx,
773 key_file, SSL_FILETYPE_PEM) != 1)
775 log_ssl_errors(LOG_LEVEL_ERROR,
776 "Loading webpage certificate private key %s failed", key_file);
781 SSL_CTX_set_options(ssl_attr->openssl_attr.ctx, SSL_OP_NO_SSLv3);
783 if (!(ssl_attr->openssl_attr.bio = BIO_new_ssl(ssl_attr->openssl_attr.ctx, 0)))
785 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create BIO structure");
790 if (BIO_get_ssl(ssl_attr->openssl_attr.bio, &ssl) != 1)
792 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_get_ssl failed");
797 if (!SSL_set_fd(ssl, csp->cfd))
799 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_fd failed");
805 * Handshake with client
807 log_error(LOG_LEVEL_CONNECT,
808 "Performing the TLS/SSL handshake with client. Hash of host: %s",
809 csp->http->hash_of_host_hex);
810 if (BIO_do_handshake(ssl_attr->openssl_attr.bio) != 1)
812 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_do_handshake failed");
817 log_error(LOG_LEVEL_CONNECT, "Client successfully connected over TLS/SSL");
818 csp->ssl_with_client_is_opened = 1;
823 * Freeing allocated paths to files
828 /* Freeing structures if connection wasn't created successfully */
831 free_client_ssl_structures(csp);
837 /*********************************************************************
839 * Function : close_client_ssl_connection
841 * Description : Closes TLS/SSL connection with client. This function
842 * checks if this connection is already created.
845 * 1 : csp = Current client state (buffers, headers, etc...)
849 *********************************************************************/
850 extern void close_client_ssl_connection(struct client_state *csp)
852 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
854 if (csp->ssl_with_client_is_opened == 0)
860 * Notifying the peer that the connection is being closed.
862 BIO_ssl_shutdown(ssl_attr->openssl_attr.bio);
863 free_client_ssl_structures(csp);
864 csp->ssl_with_client_is_opened = 0;
868 /*********************************************************************
870 * Function : free_client_ssl_structures
872 * Description : Frees structures used for SSL communication with
876 * 1 : csp = Current client state (buffers, headers, etc...)
880 *********************************************************************/
881 static void free_client_ssl_structures(struct client_state *csp)
883 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
885 if (ssl_attr->openssl_attr.bio)
887 BIO_free_all(ssl_attr->openssl_attr.bio);
889 if (ssl_attr->openssl_attr.ctx)
891 SSL_CTX_free(ssl_attr->openssl_attr.ctx);
896 /*********************************************************************
898 * Function : close_server_ssl_connection
900 * Description : Closes TLS/SSL connection with server. This function
901 * checks if this connection is already opened.
904 * 1 : csp = Current client state (buffers, headers, etc...)
908 *********************************************************************/
909 extern void close_server_ssl_connection(struct client_state *csp)
911 struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
913 if (csp->ssl_with_server_is_opened == 0)
919 * Notifying the peer that the connection is being closed.
921 BIO_ssl_shutdown(ssl_attr->openssl_attr.bio);
922 free_server_ssl_structures(csp);
923 csp->ssl_with_server_is_opened = 0;
927 /*********************************************************************
929 * Function : create_server_ssl_connection
931 * Description : Creates TLS/SSL secured connection with server.
934 * 1 : csp = Current client state (buffers, headers, etc...)
936 * Returns : 0 on success, negative value if connection wasn't created
939 *********************************************************************/
940 extern int create_server_ssl_connection(struct client_state *csp)
942 openssl_connection_attr *ssl_attrs = &csp->ssl_server_attr.openssl_attr;
944 char *trusted_cas_file = NULL;
945 STACK_OF(X509) *chain;
948 csp->server_cert_verification_result = SSL_CERT_NOT_VERIFIED;
949 csp->server_certs_chain.next = NULL;
951 /* Setting path to file with trusted CAs */
952 trusted_cas_file = csp->config->trusted_cas_file;
954 ssl_attrs->ctx = SSL_CTX_new(SSLv23_method());
957 log_ssl_errors(LOG_LEVEL_ERROR, "SSL context creation failed");
963 * Loading file with trusted CAs
965 if (!SSL_CTX_load_verify_locations(ssl_attrs->ctx, trusted_cas_file, NULL))
967 log_ssl_errors(LOG_LEVEL_ERROR, "Loading trusted CAs file %s failed",
973 SSL_CTX_set_verify(ssl_attrs->ctx, SSL_VERIFY_NONE, NULL);
974 SSL_CTX_set_options(ssl_attrs->ctx, SSL_OP_NO_SSLv3);
976 if (!(ssl_attrs->bio = BIO_new_ssl(ssl_attrs->ctx, 1)))
978 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create BIO structure");
983 if (BIO_get_ssl(ssl_attrs->bio, &ssl) != 1)
985 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_get_ssl failed");
990 if (!SSL_set_fd(ssl, csp->server_connection.sfd))
992 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_fd failed");
998 * Set the hostname to check against the received server certificate
1000 if (!SSL_set1_host(ssl, csp->http->host))
1002 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set1_host failed");
1008 if (!SSL_set_tlsext_host_name(ssl, csp->http->host))
1010 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_tlsext_host_name failed");
1016 * Handshake with server
1018 log_error(LOG_LEVEL_CONNECT,
1019 "Performing the TLS/SSL handshake with the server");
1021 if (BIO_do_handshake(ssl_attrs->bio) != 1)
1023 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_do_handshake failed");
1028 chain = SSL_get_peer_cert_chain(ssl);
1031 for (int i = 0; i < sk_X509_num(chain); i++)
1033 if (ssl_store_cert(csp, sk_X509_value(chain, i)) != 0)
1035 log_error(LOG_LEVEL_ERROR, "ssl_store_cert failed");
1042 if (!csp->dont_verify_certificate)
1044 long verify_result = SSL_get_verify_result(ssl);
1045 if (verify_result == X509_V_OK)
1048 csp->server_cert_verification_result = SSL_CERT_VALID;
1052 csp->server_cert_verification_result = verify_result;
1053 log_error(LOG_LEVEL_ERROR, "SSL_get_verify_result failed: %s",
1054 X509_verify_cert_error_string(verify_result));
1060 log_error(LOG_LEVEL_CONNECT, "Server successfully connected over TLS/SSL");
1063 * Server certificate chain is valid, so we can clean
1064 * chain, because we will not send it to client.
1066 free_certificate_chain(csp);
1068 csp->ssl_with_server_is_opened = 1;
1070 /* Freeing structures if connection wasn't created successfully */
1073 free_server_ssl_structures(csp);
1080 /*********************************************************************
1082 * Function : free_server_ssl_structures
1084 * Description : Frees structures used for SSL communication with server
1087 * 1 : csp = Current client state (buffers, headers, etc...)
1091 *********************************************************************/
1092 static void free_server_ssl_structures(struct client_state *csp)
1094 struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
1096 if (ssl_attr->openssl_attr.bio)
1098 BIO_free_all(ssl_attr->openssl_attr.bio);
1100 if (ssl_attr->openssl_attr.ctx)
1102 SSL_CTX_free(ssl_attr->openssl_attr.ctx);
1107 /*********************************************************************
1109 * Function : log_ssl_errors
1111 * Description : Log SSL errors
1114 * 1 : debuglevel = Debug level
1115 * 2 : desc = Error description
1119 *********************************************************************/
1120 static void log_ssl_errors(int debuglevel, const char* fmt, ...)
1122 unsigned long err_code;
1123 char prefix[ERROR_BUF_SIZE];
1125 va_start(args, fmt);
1126 vsnprintf(prefix, sizeof(prefix), fmt, args);
1129 while ((err_code = ERR_get_error()))
1131 char err_buf[ERROR_BUF_SIZE];
1133 ERR_error_string_n(err_code, err_buf, sizeof(err_buf));
1134 log_error(debuglevel, "%s: %s", prefix, err_buf);
1138 * In case if called by mistake and there were
1139 * no SSL errors let's report it to the log.
1143 log_error(debuglevel, "%s: no ssl errors detected", prefix);
1148 /*********************************************************************
1150 * Function : ssl_base64_encode
1152 * Description : Encode a buffer into base64 format.
1155 * 1 : dst = Destination buffer
1156 * 2 : dlen = Destination buffer length
1157 * 3 : olen = Number of bytes written
1158 * 4 : src = Source buffer
1159 * 5 : slen = Amount of data to be encoded
1161 * Returns : 0 on success, error code othervise
1163 *********************************************************************/
1164 extern int ssl_base64_encode(unsigned char *dst, size_t dlen, size_t *olen,
1165 const unsigned char *src, size_t slen)
1167 *olen = 4 * ((slen/3) + ((slen%3) ? 1 : 0)) + 1;
1172 *olen = (size_t)EVP_EncodeBlock(dst, src, (int)slen) + 1;
1177 /*********************************************************************
1179 * Function : close_file_stream
1181 * Description : Close file stream, report error on close error
1184 * 1 : f = file stream to close
1185 * 2 : path = path for error report
1189 *********************************************************************/
1190 static void close_file_stream(FILE *f, const char *path)
1194 log_error(LOG_LEVEL_ERROR,
1195 "Error closing file %s: %s", path, strerror(errno));
1200 /*********************************************************************
1202 * Function : write_certificate
1204 * Description : Writes certificate into file.
1207 * 1 : crt = certificate to write into file
1208 * 2 : output_file = path to save certificate file
1211 * Returns : 1 on success success or negative value
1213 *********************************************************************/
1214 static int write_certificate(X509 *crt, const char *output_file)
1220 * Saving certificate into file
1222 if ((f = fopen(output_file, "w")) == NULL)
1224 log_error(LOG_LEVEL_ERROR, "Opening file %s to save certificate failed",
1229 ret = PEM_write_X509(f, crt);
1232 log_ssl_errors(LOG_LEVEL_ERROR,
1233 "Writing certificate into file %s failed", output_file);
1237 close_file_stream(f, output_file);
1242 /*********************************************************************
1244 * Function : write_private_key
1246 * Description : Writes private key into file and copies saved
1247 * content into given pointer to string. If function
1248 * returns 0 for success, this copy must be freed by
1252 * 1 : key = key to write into file
1253 * 2 : ret_buf = pointer to string with created key file content
1254 * 3 : key_file_path = path where to save key file
1256 * Returns : Length of written private key on success or negative value
1259 *********************************************************************/
1260 static int write_private_key(EVP_PKEY *key, char **ret_buf,
1261 const char *key_file_path)
1263 size_t len = 0; /* Length of created key */
1264 FILE *f = NULL; /* File to save certificate */
1266 BIO *bio_mem = BIO_new(BIO_s_mem());
1267 char *bio_mem_data = 0;
1269 if (bio_mem == NULL)
1271 log_ssl_errors(LOG_LEVEL_ERROR, "write_private_key memory allocation failure");
1276 * Writing private key into PEM string
1278 if (!PEM_write_bio_PrivateKey(bio_mem, key, NULL, NULL, 0, NULL, NULL))
1280 log_ssl_errors(LOG_LEVEL_ERROR,
1281 "Writing private key into PEM string failed");
1286 len = (size_t)BIO_get_mem_data(bio_mem, &bio_mem_data);
1288 /* Initializing buffer for key file content */
1289 *ret_buf = zalloc_or_die(len + 1);
1290 (*ret_buf)[len] = 0;
1292 strncpy(*ret_buf, bio_mem_data, len);
1295 * Saving key into file
1297 if ((f = fopen(key_file_path, "wb")) == NULL)
1299 log_error(LOG_LEVEL_ERROR,
1300 "Opening file %s to save private key failed: %E",
1306 if (fwrite(*ret_buf, 1, len, f) != len)
1308 log_error(LOG_LEVEL_ERROR,
1309 "Writing private key into file %s failed",
1311 close_file_stream(f, key_file_path);
1316 close_file_stream(f, key_file_path);
1330 /*********************************************************************
1332 * Function : generate_key
1334 * Description : Tests if private key for host saved in csp already
1335 * exists. If this file doesn't exists, a new key is
1336 * generated and saved in a file. The generated key is also
1337 * copied into given parameter key_buf, which must be then
1338 * freed by caller. If file with key exists, key_buf
1339 * contain NULL and no private key is generated.
1342 * 1 : csp = Current client state (buffers, headers, etc...)
1343 * 2 : key_buf = buffer to save new generated key
1345 * Returns : -1 => Error while generating private key
1346 * 0 => Key already exists
1347 * >0 => Length of generated private key
1349 *********************************************************************/
1350 static int generate_key(struct client_state *csp, char **key_buf)
1353 char* key_file_path = NULL;
1354 BIGNUM *exp = BN_new();
1355 RSA *rsa = RSA_new();
1356 EVP_PKEY *key = EVP_PKEY_new();
1358 if (exp == NULL || rsa == NULL || key == NULL)
1360 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key memory allocation failure");
1365 BN_set_word(exp, RSA_KEY_PUBLIC_EXPONENT);
1367 key_file_path = make_certs_path(csp->config->certificate_directory,
1368 (char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
1369 if (key_file_path == NULL)
1376 * Test if key already exists. If so, we don't have to create it again.
1378 if (file_exists(key_file_path) == 1)
1384 ret = RSA_generate_key_ex(rsa, RSA_KEYSIZE, exp, NULL);
1387 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key generation failure");
1392 if (!EVP_PKEY_set1_RSA(key, rsa))
1394 log_ssl_errors(LOG_LEVEL_ERROR,
1395 "Error assigning RSA key pair to PKEY structure");
1401 * Exporting private key into file
1403 if ((ret = write_private_key(key, key_buf, key_file_path)) < 0)
1405 log_error(LOG_LEVEL_ERROR,
1406 "Writing private key into file %s failed", key_file_path);
1413 * Freeing used variables
1427 freez(key_file_path);
1433 /*********************************************************************
1435 * Function : ssl_certificate_load
1437 * Description : Loads certificate from file.
1440 * 1 : cert_path = The certificate path to load
1442 * Returns : NULL => error loading certificate,
1443 * pointer to certificate instance otherwise
1445 *********************************************************************/
1446 static X509* ssl_certificate_load(const char *cert_path)
1449 FILE *cert_f = NULL;
1451 if (!(cert_f = fopen(cert_path, "r")))
1453 log_error(LOG_LEVEL_ERROR,
1454 "Error opening certificate file %s: %s", cert_path, strerror(errno));
1458 if (!(cert = PEM_read_X509(cert_f, NULL, NULL, NULL)))
1460 log_ssl_errors(LOG_LEVEL_ERROR,
1461 "Error reading certificate file %s", cert_path);
1464 close_file_stream(cert_f, cert_path);
1469 /*********************************************************************
1471 * Function : ssl_certificate_is_invalid
1473 * Description : Checks whether or not a certificate is valid.
1474 * Currently only checks that the certificate can be
1475 * parsed and that the "valid to" date is in the future.
1478 * 1 : cert_file = The certificate to check
1480 * Returns : 0 => The certificate is valid.
1481 * 1 => The certificate is invalid
1483 *********************************************************************/
1484 static int ssl_certificate_is_invalid(const char *cert_file)
1490 if (!(cert = ssl_certificate_load(cert_file)))
1492 log_ssl_errors(LOG_LEVEL_ERROR,
1493 "Error reading certificate file %s", cert_file);
1497 ret = X509_cmp_current_time(X509_get_notAfter(cert));
1500 log_ssl_errors(LOG_LEVEL_ERROR,
1501 "Error checking certificate %s validity", cert_file);
1506 return ret == -1 ? 1 : 0;
1510 /*********************************************************************
1512 * Function : set_x509_ext
1514 * Description : Sets the X509V3 extension data
1517 * 1 : cert = The certificate to modify
1518 * 2 : issuer = Issuer certificate
1519 * 3 : nid = OpenSSL NID
1520 * 4 : value = extension value
1522 * Returns : 0 => Error while setting extensuon data
1525 *********************************************************************/
1526 static int set_x509_ext(X509 *cert, X509 *issuer, int nid, char *value)
1528 X509_EXTENSION *ext = NULL;
1532 X509V3_set_ctx(&ctx, issuer, cert, NULL, NULL, 0);
1533 ext = X509V3_EXT_conf_nid(NULL, &ctx, nid, value);
1536 log_ssl_errors(LOG_LEVEL_ERROR, "X509V3_EXT_conf_nid failure");
1540 if (!X509_add_ext(cert, ext, -1))
1542 log_ssl_errors(LOG_LEVEL_ERROR, "X509_add_ext failure");
1550 X509_EXTENSION_free(ext);
1556 /*********************************************************************
1558 * Function : set_subject_alternative_name
1560 * Description : Sets the Subject Alternative Name extension to a cert
1563 * 1 : cert = The certificate to modify
1564 * 2 : issuer = Issuer certificate
1565 * 3 : hostname = The hostname to add
1567 * Returns : 0 => Error while creating certificate.
1570 *********************************************************************/
1571 static int set_subject_alternative_name(X509 *cert, X509 *issuer, const char *hostname)
1573 size_t altname_len = strlen(hostname) + sizeof(CERTIFICATE_ALT_NAME_PREFIX);
1574 char alt_name_buf[altname_len];
1576 snprintf(alt_name_buf, sizeof(alt_name_buf),
1577 CERTIFICATE_ALT_NAME_PREFIX"%s", hostname);
1578 return set_x509_ext(cert, issuer, NID_subject_alt_name, alt_name_buf);
1582 /*********************************************************************
1584 * Function : generate_webpage_certificate
1586 * Description : Creates certificate file in presetted directory.
1587 * If certificate already exists, no other certificate
1588 * will be created. Subject of certificate is named
1589 * by csp->http->host from parameter. This function also
1590 * triggers generating of private key for new certificate.
1593 * 1 : csp = Current client state (buffers, headers, etc...)
1595 * Returns : -1 => Error while creating certificate.
1596 * 0 => Certificate already exists.
1597 * 1 => Certificate created
1599 *********************************************************************/
1600 static int generate_webpage_certificate(struct client_state *csp)
1602 char *key_buf = NULL; /* Buffer for created key */
1603 X509 *issuer_cert = NULL;
1606 EVP_PKEY *loaded_subject_key = NULL;
1607 EVP_PKEY *loaded_issuer_key = NULL;
1608 X509_NAME *issuer_name;
1609 X509_NAME *subject_name = NULL;
1610 ASN1_TIME *asn_time = NULL;
1611 ASN1_INTEGER *serial = NULL;
1612 BIGNUM *serial_num = NULL;
1615 cert_options cert_opt;
1616 char cert_valid_from[VALID_DATETIME_BUFLEN];
1617 char cert_valid_to[VALID_DATETIME_BUFLEN];
1619 /* Paths to keys and certificates needed to create certificate */
1620 cert_opt.issuer_key = NULL;
1621 cert_opt.subject_key = NULL;
1622 cert_opt.issuer_crt = NULL;
1624 cert_opt.output_file = make_certs_path(csp->config->certificate_directory,
1625 (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
1626 if (cert_opt.output_file == NULL)
1631 cert_opt.subject_key = make_certs_path(csp->config->certificate_directory,
1632 (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
1633 if (cert_opt.subject_key == NULL)
1635 freez(cert_opt.output_file);
1639 if (file_exists(cert_opt.output_file) == 1)
1641 /* The file exists, but is it valid? */
1642 if (ssl_certificate_is_invalid(cert_opt.output_file))
1644 log_error(LOG_LEVEL_CONNECT,
1645 "Certificate %s is no longer valid. Removing it.",
1646 cert_opt.output_file);
1647 if (unlink(cert_opt.output_file))
1649 log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
1650 cert_opt.output_file);
1652 freez(cert_opt.output_file);
1653 freez(cert_opt.subject_key);
1657 if (unlink(cert_opt.subject_key))
1659 log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
1660 cert_opt.subject_key);
1662 freez(cert_opt.output_file);
1663 freez(cert_opt.subject_key);
1670 freez(cert_opt.output_file);
1671 freez(cert_opt.subject_key);
1678 * Create key for requested host
1680 int subject_key_len = generate_key(csp, &key_buf);
1681 if (subject_key_len < 0)
1683 freez(cert_opt.output_file);
1684 freez(cert_opt.subject_key);
1685 log_error(LOG_LEVEL_ERROR, "Key generating failed");
1690 * Converting unsigned long serial number to char * serial number.
1691 * We must compute length of serial number in string + terminating null.
1693 unsigned long certificate_serial = get_certificate_serial(csp);
1694 unsigned long certificate_serial_time = (unsigned long)time(NULL);
1695 int serial_num_size = snprintf(NULL, 0, "%lu%lu",
1696 certificate_serial_time, certificate_serial) + 1;
1697 if (serial_num_size <= 0)
1699 serial_num_size = 1;
1702 char serial_num_text[serial_num_size]; /* Buffer for serial number */
1703 ret = snprintf(serial_num_text, (size_t)serial_num_size, "%lu%lu",
1704 certificate_serial_time, certificate_serial);
1705 if (ret < 0 || ret >= serial_num_size)
1707 log_error(LOG_LEVEL_ERROR,
1708 "Converting certificate serial number into string failed");
1714 * Preparing parameters for certificate
1716 subject_name = X509_NAME_new();
1719 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key memory allocation failure");
1724 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_COMMON_NAME_FCODE,
1725 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1727 log_ssl_errors(LOG_LEVEL_ERROR,
1728 "X509 subject name (code: %s, val: %s) error",
1729 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1733 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_ORGANIZATION_FCODE,
1734 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1736 log_ssl_errors(LOG_LEVEL_ERROR,
1737 "X509 subject name (code: %s, val: %s) error",
1738 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1742 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_ORG_UNIT_FCODE,
1743 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1745 log_ssl_errors(LOG_LEVEL_ERROR,
1746 "X509 subject name (code: %s, val: %s) error",
1747 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1751 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_COUNTRY_FCODE,
1752 MBSTRING_ASC, (void *)CERT_PARAM_COUNTRY_CODE, -1, -1, 0))
1754 log_ssl_errors(LOG_LEVEL_ERROR,
1755 "X509 subject name (code: %s, val: %s) error",
1756 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1761 cert_opt.issuer_crt = csp->config->ca_cert_file;
1762 cert_opt.issuer_key = csp->config->ca_key_file;
1764 if (get_certificate_valid_from_date(cert_valid_from,
1765 sizeof(cert_valid_from), VALID_DATETIME_FMT)
1766 || get_certificate_valid_to_date(cert_valid_to,
1767 sizeof(cert_valid_to), VALID_DATETIME_FMT))
1769 log_error(LOG_LEVEL_ERROR, "Generating one of the validity dates failed");
1774 cert_opt.subject_pwd = CERT_SUBJECT_PASSWORD;
1775 cert_opt.issuer_pwd = csp->config->ca_password;
1776 cert_opt.not_before = cert_valid_from;
1777 cert_opt.not_after = cert_valid_to;
1778 cert_opt.serial = serial_num_text;
1779 cert_opt.max_pathlen = -1;
1782 * Test if the private key was already created.
1783 * XXX: Can this still happen?
1785 if (subject_key_len == 0)
1787 log_error(LOG_LEVEL_ERROR, "Subject key was already created");
1793 * Parse serial to MPI
1795 serial_num = BN_new();
1798 log_error(LOG_LEVEL_ERROR, "generate_webpage_certificate: memory error");
1802 if (!BN_dec2bn(&serial_num, cert_opt.serial))
1804 log_ssl_errors(LOG_LEVEL_ERROR, "Failed to parse serial %s", cert_opt.serial);
1809 if (!(serial = BN_to_ASN1_INTEGER(serial_num, NULL)))
1811 log_ssl_errors(LOG_LEVEL_ERROR, "Failed to generate serial ASN1 representation");
1817 * Loading certificates
1819 if (!(issuer_cert = ssl_certificate_load(cert_opt.issuer_crt)))
1821 log_error(LOG_LEVEL_ERROR, "Loading issuer certificate %s failed",
1822 cert_opt.issuer_crt);
1827 issuer_name = X509_get_issuer_name(issuer_cert);
1830 * Loading keys from file or from buffer
1832 if (key_buf != NULL && subject_key_len > 0)
1834 pk_bio = BIO_new_mem_buf(key_buf, subject_key_len);
1836 else if (!(pk_bio = BIO_new_file(cert_opt.subject_key, "r")))
1838 log_ssl_errors(LOG_LEVEL_ERROR,
1839 "Failure opening subject key %s BIO", cert_opt.subject_key);
1844 loaded_subject_key = PEM_read_bio_PrivateKey(pk_bio, NULL, NULL,
1845 (void *)cert_opt.subject_pwd);
1846 if (!loaded_subject_key)
1848 log_ssl_errors(LOG_LEVEL_ERROR, "Parsing subject key %s failed",
1849 cert_opt.subject_key);
1854 if (!BIO_free(pk_bio))
1856 log_ssl_errors(LOG_LEVEL_ERROR, "Error closing subject key BIO");
1859 if (!(pk_bio = BIO_new_file(cert_opt.issuer_key, "r")))
1861 log_ssl_errors(LOG_LEVEL_ERROR, "Failure opening issuer key %s BIO",
1862 cert_opt.issuer_key);
1867 loaded_issuer_key = PEM_read_bio_PrivateKey(pk_bio, NULL, NULL,
1868 (void *)cert_opt.issuer_pwd);
1869 if (!loaded_issuer_key)
1871 log_ssl_errors(LOG_LEVEL_ERROR, "Parsing issuer key %s failed",
1872 cert_opt.subject_key);
1880 log_ssl_errors(LOG_LEVEL_ERROR, "Certificate allocation error");
1885 if (!X509_set_version(cert, CERTIFICATE_VERSION))
1887 log_ssl_errors(LOG_LEVEL_ERROR, "X509_set_version failed");
1893 * Setting parameters of signed certificate
1895 if (!X509_set_pubkey(cert, loaded_subject_key))
1897 log_ssl_errors(LOG_LEVEL_ERROR,
1898 "Setting issuer name in signed certificate failed");
1903 if (!X509_set_subject_name(cert, subject_name))
1905 log_ssl_errors(LOG_LEVEL_ERROR,
1906 "Setting issuer name in signed certificate failed");
1911 if (!X509_set_issuer_name(cert, issuer_name))
1913 log_ssl_errors(LOG_LEVEL_ERROR,
1914 "Setting issuer name in signed certificate failed");
1919 if (!X509_set_serialNumber(cert, serial))
1921 log_ssl_errors(LOG_LEVEL_ERROR,
1922 "Setting serial number in signed certificate failed");
1927 asn_time = ASN1_TIME_new();
1930 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time memory allocation failure");
1935 if (!ASN1_TIME_set_string(asn_time, cert_opt.not_after))
1937 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time [%s] encode error", cert_opt.not_after);
1942 if (!X509_set1_notAfter(cert, asn_time))
1944 log_ssl_errors(LOG_LEVEL_ERROR,
1945 "Setting valid not after in signed certificate failed");
1950 if (!ASN1_TIME_set_string(asn_time, cert_opt.not_before))
1952 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time encode error");
1957 if (!X509_set1_notBefore(cert, asn_time))
1959 log_ssl_errors(LOG_LEVEL_ERROR,
1960 "Setting valid not befre in signed certificate failed");
1965 if (!set_x509_ext(cert, issuer_cert, NID_basic_constraints, CERTIFICATE_BASIC_CONSTRAINTS))
1967 log_ssl_errors(LOG_LEVEL_ERROR, "Setting the basicConstraints extension "
1968 "in signed certificate failed");
1973 if (!set_x509_ext(cert, issuer_cert, NID_subject_key_identifier, CERTIFICATE_SUBJECT_KEY))
1975 log_ssl_errors(LOG_LEVEL_ERROR,
1976 "Setting the Subject Key Identifie extension failed");
1981 if (!set_x509_ext(cert, issuer_cert, NID_authority_key_identifier, CERTIFICATE_AUTHORITY_KEY))
1983 log_ssl_errors(LOG_LEVEL_ERROR,
1984 "Setting the Authority Key Identifier extension failed");
1989 if (!host_is_ip_address(csp->http->host) &&
1990 !set_subject_alternative_name(cert, issuer_cert, csp->http->host))
1992 log_ssl_errors(LOG_LEVEL_ERROR, "Setting the Subject Alt Nameextension failed");
1997 if (!X509_sign(cert, loaded_issuer_key, EVP_sha256()))
1999 log_ssl_errors(LOG_LEVEL_ERROR, "Signing certificate failed");
2005 * Writing certificate into file
2007 if (write_certificate(cert, cert_opt.output_file) < 0)
2009 log_error(LOG_LEVEL_ERROR, "Writing certificate into file failed");
2018 * Freeing used structures
2022 X509_free(issuer_cert);
2028 if (pk_bio && !BIO_free(pk_bio))
2030 log_ssl_errors(LOG_LEVEL_ERROR, "Error closing pk BIO");
2032 if (loaded_subject_key)
2034 EVP_PKEY_free(loaded_subject_key);
2036 if (loaded_issuer_key)
2038 EVP_PKEY_free(loaded_issuer_key);
2042 X509_NAME_free(subject_name);
2046 ASN1_TIME_free(asn_time);
2050 BN_free(serial_num);
2054 ASN1_INTEGER_free(serial);
2056 freez(cert_opt.subject_key);
2057 freez(cert_opt.output_file);
2064 /*********************************************************************
2066 * Function : ssl_crt_verify_info
2068 * Description : Returns an informational string about the verification
2069 * status of a certificate.
2072 * 1 : buf = Buffer to write to
2073 * 2 : size = Maximum size of buffer
2074 * 3 : csp = client state
2078 *********************************************************************/
2079 extern void ssl_crt_verify_info(char *buf, size_t size, struct client_state *csp)
2081 strncpy(buf, X509_verify_cert_error_string(csp->server_cert_verification_result), size);
2086 /*********************************************************************
2088 * Function : ssl_release
2090 * Description : Release all SSL resources
2096 *********************************************************************/
2097 extern void ssl_release(void)
2099 if (ssl_inited == 1)
2101 SSL_COMP_free_compression_methods();
2103 CONF_modules_free();
2104 CONF_modules_unload(1);
2106 COMP_zlib_cleanup();
2111 CRYPTO_cleanup_all_ex_data();