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 #if OPENSSL_VERSION_NUMBER < 0x10100000L
70 #define X509_set1_notBefore X509_set_notBefore
71 #define X509_set1_notAfter X509_set_notAfter
72 #define X509_get0_serialNumber X509_get_serialNumber
73 #define X509_get0_notBefore X509_get_notBefore
74 #define X509_get0_notAfter X509_get_notAfter
77 /*********************************************************************
79 * Function : openssl_init
81 * Description : Initializes OpenSSL library once
87 *********************************************************************/
88 static void openssl_init(void)
92 privoxy_mutex_lock(&ssl_init_mutex);
95 #if OPENSSL_VERSION_NUMBER < 0x10100000L
98 OPENSSL_init_ssl(0, NULL);
100 SSL_load_error_strings();
101 OpenSSL_add_ssl_algorithms();
104 privoxy_mutex_unlock(&ssl_init_mutex);
109 /*********************************************************************
111 * Function : is_ssl_pending
113 * Description : Tests if there are some waiting data on ssl connection.
114 * Only considers data that has actually been received
115 * locally and ignores data that is still on the fly
116 * or has not yet been sent by the remote end.
119 * 1 : ssl_attr = SSL context to test
121 * Returns : 0 => No data are pending
122 * >0 => Pending data length
124 *********************************************************************/
125 extern size_t is_ssl_pending(struct ssl_attr *ssl_attr)
127 BIO *bio = ssl_attr->openssl_attr.bio;
133 return (size_t)BIO_pending(bio);
137 /*********************************************************************
139 * Function : ssl_send_data
141 * Description : Sends the content of buf (for n bytes) to given SSL
142 * connection context.
145 * 1 : ssl_attr = SSL context to send data to
146 * 2 : buf = Pointer to data to be sent
147 * 3 : len = Length of data to be sent to the SSL context
149 * Returns : Length of sent data or negative value on error.
151 *********************************************************************/
152 extern int ssl_send_data(struct ssl_attr *ssl_attr, const unsigned char *buf, size_t len)
154 BIO *bio = ssl_attr->openssl_attr.bio;
156 int pos = 0; /* Position of unsent part in buffer */
165 int send_len = (int)len - pos;
167 log_error(LOG_LEVEL_WRITING, "TLS: %N", send_len, buf+pos);
170 * Sending one part of the buffer
172 while ((ret = BIO_write(bio,
173 (const unsigned char *)(buf + pos),
176 if (!BIO_should_retry(bio))
178 log_ssl_errors(LOG_LEVEL_ERROR,
179 "Sending data over TLS/SSL failed");
183 /* Adding count of sent bytes to position in buffer */
191 /*********************************************************************
193 * Function : ssl_recv_data
195 * Description : Receives data from given SSL context and puts
199 * 1 : ssl_attr = SSL context to receive data from
200 * 2 : buf = Pointer to buffer where data will be written
201 * 3 : max_length = Maximum number of bytes to read
203 * Returns : Number of bytes read, 0 for EOF, or -1
206 *********************************************************************/
207 extern int ssl_recv_data(struct ssl_attr *ssl_attr, unsigned char *buf, size_t max_length)
209 BIO *bio = ssl_attr->openssl_attr.bio;
211 memset(buf, 0, max_length);
214 * Receiving data from SSL context into buffer
218 ret = BIO_read(bio, buf, (int)max_length);
219 } while (ret <= 0 && BIO_should_retry(bio));
223 log_ssl_errors(LOG_LEVEL_ERROR,
224 "Receiving data over TLS/SSL failed");
229 log_error(LOG_LEVEL_RECEIVED, "TLS: %N", ret, buf);
235 /*********************************************************************
237 * Function : ssl_store_cert
239 * Description : This is a callback function for certificate verification.
240 * It's called once for each certificate in the server's
241 * certificate trusted chain and prepares information about
242 * the certificate. The information can be used to inform
243 * the user about invalid certificates.
246 * 1 : csp = Current client state (buffers, headers, etc...)
247 * 2 : crt = certificate from trusted chain
249 * Returns : 0 on success and negative value on error
251 *********************************************************************/
252 static int ssl_store_cert(struct client_state *csp, X509* crt)
255 struct certs_chain *last = &(csp->server_certs_chain);
257 BIO *bio = BIO_new(BIO_s_mem());
258 EVP_PKEY *pkey = NULL;
259 char *bio_mem_data = 0;
262 const ASN1_INTEGER *bs;
263 #if OPENSSL_VERSION_NUMBER > 0x10100000L
264 const X509_ALGOR *tsig_alg;
270 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new_mem_buf() failed");
275 * Searching for last item in certificates linked list
277 while (last->next != NULL)
283 * Preparing next item in linked list for next certificate
285 last->next = malloc_or_die(sizeof(struct certs_chain));
286 last->next->next = NULL;
287 memset(last->next->info_buf, 0, sizeof(last->next->info_buf));
288 memset(last->next->file_buf, 0, sizeof(last->next->file_buf));
291 * Saving certificate file into buffer
293 if (!PEM_write_bio_X509(bio, crt))
295 log_ssl_errors(LOG_LEVEL_ERROR, "PEM_write_X509() failed");
300 len = BIO_get_mem_data(bio, &bio_mem_data);
302 if (len > (sizeof(last->file_buf) - 1))
304 log_error(LOG_LEVEL_ERROR,
305 "X509 PEM cert len %d is larger then buffer len %s",
306 len, sizeof(last->file_buf) - 1);
307 len = sizeof(last->file_buf) - 1;
310 strncpy(last->file_buf, bio_mem_data, (size_t)len);
312 bio = BIO_new(BIO_s_mem());
315 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new_mem_buf() failed");
321 * Saving certificate information into buffer
323 l = X509_get_version(crt);
324 if (l >= 0 && l <= 2)
326 if (BIO_printf(bio, "cert. version : %ld\n", l + 1) <= 0)
328 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for version failed");
335 if (BIO_printf(bio, "cert. version : Unknown (%ld)\n", l) <= 0)
337 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for version failed");
343 if (BIO_puts(bio, "serial number : ") <= 0)
345 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_write() for serial failed");
349 bs = X509_get0_serialNumber(crt);
350 if (bs->length <= (int)sizeof(long))
353 l = ASN1_INTEGER_get(bs);
364 if (bs->type == V_ASN1_NEG_INTEGER)
366 ul = 0 - (unsigned long)l;
371 ul = (unsigned long)l;
374 if (BIO_printf(bio, " %s%lu (%s0x%lx)\n", neg, ul, neg, ul) <= 0)
376 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for serial failed");
383 if (bs->type == V_ASN1_NEG_INTEGER)
385 if (BIO_puts(bio, " (Negative)") < 0)
387 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for serial failed");
392 for (int i = 0; i < bs->length; i++)
394 if (BIO_printf(bio, "%02x%c", bs->data[i],
395 ((i + 1 == bs->length) ? '\n' : ':')) <= 0)
397 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for serial failed");
404 if (BIO_puts(bio, "issuer name : ") <= 0)
406 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for issuer failed");
410 if (X509_NAME_print_ex(bio, X509_get_issuer_name(crt), 0, 0) < 0)
412 log_ssl_errors(LOG_LEVEL_ERROR, "X509_NAME_print_ex() for issuer failed");
417 if (BIO_puts(bio, "\nsubject name : ") <= 0)
419 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for subject failed");
423 if (X509_NAME_print_ex(bio, X509_get_subject_name(crt), 0, 0) < 0) {
424 log_ssl_errors(LOG_LEVEL_ERROR, "X509_NAME_print_ex() for subject failed");
429 if (BIO_puts(bio, "\nissued on : ") <= 0)
431 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for issued on failed");
435 if (!ASN1_TIME_print(bio, X509_get0_notBefore(crt)))
437 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_TIME_print() for issued on failed");
442 if (BIO_puts(bio, "\nexpires on : ") <= 0)
444 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for expires on failed");
448 if (!ASN1_TIME_print(bio, X509_get0_notAfter(crt)))
450 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_TIME_print() for expires on failed");
455 #if OPENSSL_VERSION_NUMBER > 0x10100000L
456 if (BIO_puts(bio, "\nsigned using : ") <= 0)
458 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for signed using failed");
462 tsig_alg = X509_get0_tbs_sigalg(crt);
463 if (!i2a_ASN1_OBJECT(bio, tsig_alg->algorithm))
465 log_ssl_errors(LOG_LEVEL_ERROR, "i2a_ASN1_OBJECT() for signed using on failed");
470 pkey = X509_get_pubkey(crt);
473 log_ssl_errors(LOG_LEVEL_ERROR, "X509_get_pubkey() failed");
478 switch (EVP_PKEY_base_id(pkey))
481 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "RSA key size", EVP_PKEY_bits(pkey));
484 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "DSA key size", EVP_PKEY_bits(pkey));
487 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "non-RSA/DSA key size", EVP_PKEY_bits(pkey));
492 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for key size failed");
497 loc = X509_get_ext_by_NID(crt, NID_basic_constraints, -1);
500 X509_EXTENSION *ex = X509_get_ext(crt, loc);
501 if (BIO_puts(bio, "\nbasic constraints : ") <= 0)
503 log_ssl_errors(LOG_LEVEL_ERROR,
504 "BIO_printf() for basic constraints failed");
508 if (!X509V3_EXT_print(bio, ex, 0, 0))
510 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex), ASN1_STRFLGS_RFC2253))
512 log_ssl_errors(LOG_LEVEL_ERROR,
513 "ASN1_STRING_print_ex() for basic constraints failed");
520 loc = X509_get_ext_by_NID(crt, NID_subject_alt_name, -1);
523 X509_EXTENSION *ex = X509_get_ext(crt, loc);
524 if (BIO_puts(bio, "\nsubject alt name : ") <= 0)
526 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for alt name failed");
530 if (!X509V3_EXT_print(bio, ex, 0, 0))
532 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
533 ASN1_STRFLGS_RFC2253))
535 log_ssl_errors(LOG_LEVEL_ERROR,
536 "ASN1_STRING_print_ex() for alt name failed");
543 loc = X509_get_ext_by_NID(crt, NID_netscape_cert_type, -1);
546 X509_EXTENSION *ex = X509_get_ext(crt, loc);
547 if (BIO_puts(bio, "\ncert. type : ") <= 0)
549 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for cert type failed");
553 if (!X509V3_EXT_print(bio, ex, 0, 0))
555 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
556 ASN1_STRFLGS_RFC2253))
558 log_ssl_errors(LOG_LEVEL_ERROR,
559 "ASN1_STRING_print_ex() for cert type failed");
566 loc = X509_get_ext_by_NID(crt, NID_key_usage, -1);
569 X509_EXTENSION *ex = X509_get_ext(crt, loc);
570 if (BIO_puts(bio, "\nkey usage : ") <= 0)
572 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for key usage failed");
576 if (!X509V3_EXT_print(bio, ex, 0, 0))
578 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
579 ASN1_STRFLGS_RFC2253))
581 log_ssl_errors(LOG_LEVEL_ERROR,
582 "ASN1_STRING_print_ex() for key usage failed");
589 loc = X509_get_ext_by_NID(crt, NID_ext_key_usage, -1);
591 X509_EXTENSION *ex = X509_get_ext(crt, loc);
592 if (BIO_puts(bio, "\next key usage : ") <= 0)
594 log_ssl_errors(LOG_LEVEL_ERROR,
595 "BIO_printf() for ext key usage failed");
599 if (!X509V3_EXT_print(bio, ex, 0, 0))
601 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
602 ASN1_STRFLGS_RFC2253))
604 log_ssl_errors(LOG_LEVEL_ERROR,
605 "ASN1_STRING_print_ex() for ext key usage failed");
612 loc = X509_get_ext_by_NID(crt, NID_certificate_policies, -1);
615 X509_EXTENSION *ex = X509_get_ext(crt, loc);
616 if (BIO_puts(bio, "\ncertificate policies : ") <= 0)
618 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for certificate policies failed");
622 if (!X509V3_EXT_print(bio, ex, 0, 0))
624 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
625 ASN1_STRFLGS_RFC2253))
627 log_ssl_errors(LOG_LEVEL_ERROR,
628 "ASN1_STRING_print_ex() for certificate policies failed");
635 /* make valgrind happy */
636 static const char zero = 0;
637 BIO_write(bio, &zero, 1);
639 len = BIO_get_mem_data(bio, &bio_mem_data);
640 encoded_text = html_encode(bio_mem_data);
641 strlcpy(last->info_buf, encoded_text, sizeof(last->info_buf));
658 /*********************************************************************
660 * Function : host_to_hash
662 * Description : Creates MD5 hash from host name. Host name is loaded
663 * from structure csp and saved again into it.
666 * 1 : csp = Current client state (buffers, headers, etc...)
668 * Returns : 1 => Error while creating hash
669 * 0 => Hash created successfully
671 *********************************************************************/
672 static int host_to_hash(struct client_state *csp)
676 memset(csp->http->hash_of_host, 0, sizeof(csp->http->hash_of_host));
677 MD5((unsigned char *)csp->http->host, strlen(csp->http->host),
678 csp->http->hash_of_host);
680 /* Converting hash into string with hex */
684 if ((ret = sprintf((char *)csp->http->hash_of_host_hex + 2 * i, "%02x",
685 csp->http->hash_of_host[i])) < 0)
687 log_error(LOG_LEVEL_ERROR, "Sprintf return value: %d", ret);
696 /*********************************************************************
698 * Function : create_client_ssl_connection
700 * Description : Creates TLS/SSL secured connection with client
703 * 1 : csp = Current client state (buffers, headers, etc...)
705 * Returns : 0 on success, negative value if connection wasn't created
708 *********************************************************************/
709 extern int create_client_ssl_connection(struct client_state *csp)
711 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
712 /* Paths to certificates file and key file */
713 char *key_file = NULL;
714 char *ca_file = NULL;
715 char *cert_file = NULL;
720 * Initializing OpenSSL structures for TLS/SSL connection
725 * Preparing hash of host for creating certificates
727 ret = host_to_hash(csp);
730 log_error(LOG_LEVEL_ERROR, "Generating hash of host failed: %d", ret);
736 * Preparing paths to certificates files and key file
738 ca_file = csp->config->ca_cert_file;
739 cert_file = make_certs_path(csp->config->certificate_directory,
740 (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
741 key_file = make_certs_path(csp->config->certificate_directory,
742 (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
744 if (cert_file == NULL || key_file == NULL)
751 * Generating certificate for requested host. Mutex to prevent
752 * certificate and key inconsistence must be locked.
754 privoxy_mutex_lock(&certificate_mutex);
756 ret = generate_webpage_certificate(csp);
759 log_error(LOG_LEVEL_ERROR,
760 "Generate_webpage_certificate failed: %d", ret);
761 privoxy_mutex_unlock(&certificate_mutex);
765 privoxy_mutex_unlock(&certificate_mutex);
767 if (!(ssl_attr->openssl_attr.ctx = SSL_CTX_new(SSLv23_server_method())))
769 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create SSL context");
774 /* Set the key and cert */
775 if (SSL_CTX_use_certificate_file(ssl_attr->openssl_attr.ctx,
776 cert_file, SSL_FILETYPE_PEM) != 1)
778 log_ssl_errors(LOG_LEVEL_ERROR,
779 "Loading webpage certificate %s failed", cert_file);
784 if (SSL_CTX_use_PrivateKey_file(ssl_attr->openssl_attr.ctx,
785 key_file, SSL_FILETYPE_PEM) != 1)
787 log_ssl_errors(LOG_LEVEL_ERROR,
788 "Loading webpage certificate private key %s failed", key_file);
793 SSL_CTX_set_options(ssl_attr->openssl_attr.ctx, SSL_OP_NO_SSLv3);
795 if (!(ssl_attr->openssl_attr.bio = BIO_new_ssl(ssl_attr->openssl_attr.ctx, 0)))
797 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create BIO structure");
802 if (BIO_get_ssl(ssl_attr->openssl_attr.bio, &ssl) != 1)
804 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_get_ssl failed");
809 if (!SSL_set_fd(ssl, csp->cfd))
811 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_fd failed");
817 * Handshake with client
819 log_error(LOG_LEVEL_CONNECT,
820 "Performing the TLS/SSL handshake with client. Hash of host: %s",
821 csp->http->hash_of_host_hex);
822 if (BIO_do_handshake(ssl_attr->openssl_attr.bio) != 1)
824 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_do_handshake failed");
829 log_error(LOG_LEVEL_CONNECT, "Client successfully connected over TLS/SSL");
830 csp->ssl_with_client_is_opened = 1;
835 * Freeing allocated paths to files
840 /* Freeing structures if connection wasn't created successfully */
843 free_client_ssl_structures(csp);
849 /*********************************************************************
851 * Function : close_client_ssl_connection
853 * Description : Closes TLS/SSL connection with client. This function
854 * checks if this connection is already created.
857 * 1 : csp = Current client state (buffers, headers, etc...)
861 *********************************************************************/
862 extern void close_client_ssl_connection(struct client_state *csp)
864 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
866 if (csp->ssl_with_client_is_opened == 0)
872 * Notifying the peer that the connection is being closed.
874 BIO_ssl_shutdown(ssl_attr->openssl_attr.bio);
875 free_client_ssl_structures(csp);
876 csp->ssl_with_client_is_opened = 0;
880 /*********************************************************************
882 * Function : free_client_ssl_structures
884 * Description : Frees structures used for SSL communication with
888 * 1 : csp = Current client state (buffers, headers, etc...)
892 *********************************************************************/
893 static void free_client_ssl_structures(struct client_state *csp)
895 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
897 if (ssl_attr->openssl_attr.bio)
899 BIO_free_all(ssl_attr->openssl_attr.bio);
901 if (ssl_attr->openssl_attr.ctx)
903 SSL_CTX_free(ssl_attr->openssl_attr.ctx);
908 /*********************************************************************
910 * Function : close_server_ssl_connection
912 * Description : Closes TLS/SSL connection with server. This function
913 * checks if this connection is already opened.
916 * 1 : csp = Current client state (buffers, headers, etc...)
920 *********************************************************************/
921 extern void close_server_ssl_connection(struct client_state *csp)
923 struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
925 if (csp->ssl_with_server_is_opened == 0)
931 * Notifying the peer that the connection is being closed.
933 BIO_ssl_shutdown(ssl_attr->openssl_attr.bio);
934 free_server_ssl_structures(csp);
935 csp->ssl_with_server_is_opened = 0;
939 /*********************************************************************
941 * Function : create_server_ssl_connection
943 * Description : Creates TLS/SSL secured connection with server.
946 * 1 : csp = Current client state (buffers, headers, etc...)
948 * Returns : 0 on success, negative value if connection wasn't created
951 *********************************************************************/
952 extern int create_server_ssl_connection(struct client_state *csp)
954 openssl_connection_attr *ssl_attrs = &csp->ssl_server_attr.openssl_attr;
956 char *trusted_cas_file = NULL;
957 STACK_OF(X509) *chain;
960 csp->server_cert_verification_result = SSL_CERT_NOT_VERIFIED;
961 csp->server_certs_chain.next = NULL;
963 /* Setting path to file with trusted CAs */
964 trusted_cas_file = csp->config->trusted_cas_file;
966 ssl_attrs->ctx = SSL_CTX_new(SSLv23_method());
969 log_ssl_errors(LOG_LEVEL_ERROR, "SSL context creation failed");
975 * Loading file with trusted CAs
977 if (!SSL_CTX_load_verify_locations(ssl_attrs->ctx, trusted_cas_file, NULL))
979 log_ssl_errors(LOG_LEVEL_ERROR, "Loading trusted CAs file %s failed",
985 SSL_CTX_set_verify(ssl_attrs->ctx, SSL_VERIFY_NONE, NULL);
986 SSL_CTX_set_options(ssl_attrs->ctx, SSL_OP_NO_SSLv3);
988 if (!(ssl_attrs->bio = BIO_new_ssl(ssl_attrs->ctx, 1)))
990 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create BIO structure");
995 if (BIO_get_ssl(ssl_attrs->bio, &ssl) != 1)
997 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_get_ssl failed");
1002 if (!SSL_set_fd(ssl, csp->server_connection.sfd))
1004 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_fd failed");
1010 * Set the hostname to check against the received server certificate
1012 #if OPENSSL_VERSION_NUMBER > 0x10100000L
1013 if (!SSL_set1_host(ssl, csp->http->host))
1015 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set1_host failed");
1020 if (host_is_ip_address(csp->http->host))
1022 if (X509_VERIFY_PARAM_set1_ip_asc(ssl->param, csp->http->host) != 1)
1024 log_ssl_errors(LOG_LEVEL_ERROR,
1025 "X509_VERIFY_PARAM_set1_ip_asc() failed");
1032 if (X509_VERIFY_PARAM_set1_host(ssl->param, csp->http->host, 0) != 1)
1034 log_ssl_errors(LOG_LEVEL_ERROR,
1035 "X509_VERIFY_PARAM_set1_host() failed");
1042 if (!SSL_set_tlsext_host_name(ssl, csp->http->host))
1044 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_tlsext_host_name failed");
1050 * Handshake with server
1052 log_error(LOG_LEVEL_CONNECT,
1053 "Performing the TLS/SSL handshake with the server");
1055 if (BIO_do_handshake(ssl_attrs->bio) != 1)
1057 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_do_handshake failed");
1062 chain = SSL_get_peer_cert_chain(ssl);
1065 for (int i = 0; i < sk_X509_num(chain); i++)
1067 if (ssl_store_cert(csp, sk_X509_value(chain, i)) != 0)
1069 log_error(LOG_LEVEL_ERROR, "ssl_store_cert failed");
1076 if (!csp->dont_verify_certificate)
1078 long verify_result = SSL_get_verify_result(ssl);
1079 if (verify_result == X509_V_OK)
1082 csp->server_cert_verification_result = SSL_CERT_VALID;
1086 csp->server_cert_verification_result = verify_result;
1087 log_error(LOG_LEVEL_ERROR, "SSL_get_verify_result failed: %s",
1088 X509_verify_cert_error_string(verify_result));
1094 log_error(LOG_LEVEL_CONNECT, "Server successfully connected over TLS/SSL");
1097 * Server certificate chain is valid, so we can clean
1098 * chain, because we will not send it to client.
1100 free_certificate_chain(csp);
1102 csp->ssl_with_server_is_opened = 1;
1104 /* Freeing structures if connection wasn't created successfully */
1107 free_server_ssl_structures(csp);
1114 /*********************************************************************
1116 * Function : free_server_ssl_structures
1118 * Description : Frees structures used for SSL communication with server
1121 * 1 : csp = Current client state (buffers, headers, etc...)
1125 *********************************************************************/
1126 static void free_server_ssl_structures(struct client_state *csp)
1128 struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
1130 if (ssl_attr->openssl_attr.bio)
1132 BIO_free_all(ssl_attr->openssl_attr.bio);
1134 if (ssl_attr->openssl_attr.ctx)
1136 SSL_CTX_free(ssl_attr->openssl_attr.ctx);
1141 /*********************************************************************
1143 * Function : log_ssl_errors
1145 * Description : Log SSL errors
1148 * 1 : debuglevel = Debug level
1149 * 2 : desc = Error description
1153 *********************************************************************/
1154 static void log_ssl_errors(int debuglevel, const char* fmt, ...)
1156 unsigned long err_code;
1157 char prefix[ERROR_BUF_SIZE];
1159 va_start(args, fmt);
1160 vsnprintf(prefix, sizeof(prefix), fmt, args);
1163 while ((err_code = ERR_get_error()))
1165 char err_buf[ERROR_BUF_SIZE];
1167 ERR_error_string_n(err_code, err_buf, sizeof(err_buf));
1168 log_error(debuglevel, "%s: %s", prefix, err_buf);
1172 * In case if called by mistake and there were
1173 * no SSL errors let's report it to the log.
1177 log_error(debuglevel, "%s: no ssl errors detected", prefix);
1182 /*********************************************************************
1184 * Function : ssl_base64_encode
1186 * Description : Encode a buffer into base64 format.
1189 * 1 : dst = Destination buffer
1190 * 2 : dlen = Destination buffer length
1191 * 3 : olen = Number of bytes written
1192 * 4 : src = Source buffer
1193 * 5 : slen = Amount of data to be encoded
1195 * Returns : 0 on success, error code othervise
1197 *********************************************************************/
1198 extern int ssl_base64_encode(unsigned char *dst, size_t dlen, size_t *olen,
1199 const unsigned char *src, size_t slen)
1201 *olen = 4 * ((slen/3) + ((slen%3) ? 1 : 0)) + 1;
1206 *olen = (size_t)EVP_EncodeBlock(dst, src, (int)slen) + 1;
1211 /*********************************************************************
1213 * Function : close_file_stream
1215 * Description : Close file stream, report error on close error
1218 * 1 : f = file stream to close
1219 * 2 : path = path for error report
1223 *********************************************************************/
1224 static void close_file_stream(FILE *f, const char *path)
1228 log_error(LOG_LEVEL_ERROR,
1229 "Error closing file %s: %s", path, strerror(errno));
1234 /*********************************************************************
1236 * Function : write_certificate
1238 * Description : Writes certificate into file.
1241 * 1 : crt = certificate to write into file
1242 * 2 : output_file = path to save certificate file
1245 * Returns : 1 on success success or negative value
1247 *********************************************************************/
1248 static int write_certificate(X509 *crt, const char *output_file)
1254 * Saving certificate into file
1256 if ((f = fopen(output_file, "w")) == NULL)
1258 log_error(LOG_LEVEL_ERROR, "Opening file %s to save certificate failed",
1263 ret = PEM_write_X509(f, crt);
1266 log_ssl_errors(LOG_LEVEL_ERROR,
1267 "Writing certificate into file %s failed", output_file);
1271 close_file_stream(f, output_file);
1276 /*********************************************************************
1278 * Function : write_private_key
1280 * Description : Writes private key into file and copies saved
1281 * content into given pointer to string. If function
1282 * returns 0 for success, this copy must be freed by
1286 * 1 : key = key to write into file
1287 * 2 : ret_buf = pointer to string with created key file content
1288 * 3 : key_file_path = path where to save key file
1290 * Returns : Length of written private key on success or negative value
1293 *********************************************************************/
1294 static int write_private_key(EVP_PKEY *key, char **ret_buf,
1295 const char *key_file_path)
1297 size_t len = 0; /* Length of created key */
1298 FILE *f = NULL; /* File to save certificate */
1300 BIO *bio_mem = BIO_new(BIO_s_mem());
1301 char *bio_mem_data = 0;
1303 if (bio_mem == NULL)
1305 log_ssl_errors(LOG_LEVEL_ERROR, "write_private_key memory allocation failure");
1310 * Writing private key into PEM string
1312 if (!PEM_write_bio_PrivateKey(bio_mem, key, NULL, NULL, 0, NULL, NULL))
1314 log_ssl_errors(LOG_LEVEL_ERROR,
1315 "Writing private key into PEM string failed");
1320 len = (size_t)BIO_get_mem_data(bio_mem, &bio_mem_data);
1322 /* Initializing buffer for key file content */
1323 *ret_buf = zalloc_or_die(len + 1);
1324 (*ret_buf)[len] = 0;
1326 strncpy(*ret_buf, bio_mem_data, len);
1329 * Saving key into file
1331 if ((f = fopen(key_file_path, "wb")) == NULL)
1333 log_error(LOG_LEVEL_ERROR,
1334 "Opening file %s to save private key failed: %E",
1340 if (fwrite(*ret_buf, 1, len, f) != len)
1342 log_error(LOG_LEVEL_ERROR,
1343 "Writing private key into file %s failed",
1345 close_file_stream(f, key_file_path);
1350 close_file_stream(f, key_file_path);
1364 /*********************************************************************
1366 * Function : generate_key
1368 * Description : Tests if private key for host saved in csp already
1369 * exists. If this file doesn't exists, a new key is
1370 * generated and saved in a file. The generated key is also
1371 * copied into given parameter key_buf, which must be then
1372 * freed by caller. If file with key exists, key_buf
1373 * contain NULL and no private key is generated.
1376 * 1 : csp = Current client state (buffers, headers, etc...)
1377 * 2 : key_buf = buffer to save new generated key
1379 * Returns : -1 => Error while generating private key
1380 * 0 => Key already exists
1381 * >0 => Length of generated private key
1383 *********************************************************************/
1384 static int generate_key(struct client_state *csp, char **key_buf)
1387 char* key_file_path = NULL;
1388 BIGNUM *exp = BN_new();
1389 RSA *rsa = RSA_new();
1390 EVP_PKEY *key = EVP_PKEY_new();
1392 if (exp == NULL || rsa == NULL || key == NULL)
1394 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key memory allocation failure");
1399 BN_set_word(exp, RSA_KEY_PUBLIC_EXPONENT);
1401 key_file_path = make_certs_path(csp->config->certificate_directory,
1402 (char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
1403 if (key_file_path == NULL)
1410 * Test if key already exists. If so, we don't have to create it again.
1412 if (file_exists(key_file_path) == 1)
1418 ret = RSA_generate_key_ex(rsa, RSA_KEYSIZE, exp, NULL);
1421 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key generation failure");
1426 if (!EVP_PKEY_set1_RSA(key, rsa))
1428 log_ssl_errors(LOG_LEVEL_ERROR,
1429 "Error assigning RSA key pair to PKEY structure");
1435 * Exporting private key into file
1437 if ((ret = write_private_key(key, key_buf, key_file_path)) < 0)
1439 log_error(LOG_LEVEL_ERROR,
1440 "Writing private key into file %s failed", key_file_path);
1447 * Freeing used variables
1461 freez(key_file_path);
1467 /*********************************************************************
1469 * Function : ssl_certificate_load
1471 * Description : Loads certificate from file.
1474 * 1 : cert_path = The certificate path to load
1476 * Returns : NULL => error loading certificate,
1477 * pointer to certificate instance otherwise
1479 *********************************************************************/
1480 static X509* ssl_certificate_load(const char *cert_path)
1483 FILE *cert_f = NULL;
1485 if (!(cert_f = fopen(cert_path, "r")))
1487 log_error(LOG_LEVEL_ERROR,
1488 "Error opening certificate file %s: %s", cert_path, strerror(errno));
1492 if (!(cert = PEM_read_X509(cert_f, NULL, NULL, NULL)))
1494 log_ssl_errors(LOG_LEVEL_ERROR,
1495 "Error reading certificate file %s", cert_path);
1498 close_file_stream(cert_f, cert_path);
1503 /*********************************************************************
1505 * Function : ssl_certificate_is_invalid
1507 * Description : Checks whether or not a certificate is valid.
1508 * Currently only checks that the certificate can be
1509 * parsed and that the "valid to" date is in the future.
1512 * 1 : cert_file = The certificate to check
1514 * Returns : 0 => The certificate is valid.
1515 * 1 => The certificate is invalid
1517 *********************************************************************/
1518 static int ssl_certificate_is_invalid(const char *cert_file)
1524 if (!(cert = ssl_certificate_load(cert_file)))
1526 log_ssl_errors(LOG_LEVEL_ERROR,
1527 "Error reading certificate file %s", cert_file);
1531 ret = X509_cmp_current_time(X509_get_notAfter(cert));
1534 log_ssl_errors(LOG_LEVEL_ERROR,
1535 "Error checking certificate %s validity", cert_file);
1540 return ret == -1 ? 1 : 0;
1544 /*********************************************************************
1546 * Function : set_x509_ext
1548 * Description : Sets the X509V3 extension data
1551 * 1 : cert = The certificate to modify
1552 * 2 : issuer = Issuer certificate
1553 * 3 : nid = OpenSSL NID
1554 * 4 : value = extension value
1556 * Returns : 0 => Error while setting extensuon data
1559 *********************************************************************/
1560 static int set_x509_ext(X509 *cert, X509 *issuer, int nid, char *value)
1562 X509_EXTENSION *ext = NULL;
1566 X509V3_set_ctx(&ctx, issuer, cert, NULL, NULL, 0);
1567 ext = X509V3_EXT_conf_nid(NULL, &ctx, nid, value);
1570 log_ssl_errors(LOG_LEVEL_ERROR, "X509V3_EXT_conf_nid failure");
1574 if (!X509_add_ext(cert, ext, -1))
1576 log_ssl_errors(LOG_LEVEL_ERROR, "X509_add_ext failure");
1584 X509_EXTENSION_free(ext);
1590 /*********************************************************************
1592 * Function : set_subject_alternative_name
1594 * Description : Sets the Subject Alternative Name extension to a cert
1597 * 1 : cert = The certificate to modify
1598 * 2 : issuer = Issuer certificate
1599 * 3 : hostname = The hostname to add
1601 * Returns : 0 => Error while creating certificate.
1604 *********************************************************************/
1605 static int set_subject_alternative_name(X509 *cert, X509 *issuer, const char *hostname)
1607 size_t altname_len = strlen(hostname) + sizeof(CERTIFICATE_ALT_NAME_PREFIX);
1608 char alt_name_buf[altname_len];
1610 snprintf(alt_name_buf, sizeof(alt_name_buf),
1611 CERTIFICATE_ALT_NAME_PREFIX"%s", hostname);
1612 return set_x509_ext(cert, issuer, NID_subject_alt_name, alt_name_buf);
1616 /*********************************************************************
1618 * Function : generate_webpage_certificate
1620 * Description : Creates certificate file in presetted directory.
1621 * If certificate already exists, no other certificate
1622 * will be created. Subject of certificate is named
1623 * by csp->http->host from parameter. This function also
1624 * triggers generating of private key for new certificate.
1627 * 1 : csp = Current client state (buffers, headers, etc...)
1629 * Returns : -1 => Error while creating certificate.
1630 * 0 => Certificate already exists.
1631 * 1 => Certificate created
1633 *********************************************************************/
1634 static int generate_webpage_certificate(struct client_state *csp)
1636 char *key_buf = NULL; /* Buffer for created key */
1637 X509 *issuer_cert = NULL;
1640 EVP_PKEY *loaded_subject_key = NULL;
1641 EVP_PKEY *loaded_issuer_key = NULL;
1642 X509_NAME *issuer_name;
1643 X509_NAME *subject_name = NULL;
1644 ASN1_TIME *asn_time = NULL;
1645 ASN1_INTEGER *serial = NULL;
1646 BIGNUM *serial_num = NULL;
1649 cert_options cert_opt;
1650 char cert_valid_from[VALID_DATETIME_BUFLEN];
1651 char cert_valid_to[VALID_DATETIME_BUFLEN];
1653 /* Paths to keys and certificates needed to create certificate */
1654 cert_opt.issuer_key = NULL;
1655 cert_opt.subject_key = NULL;
1656 cert_opt.issuer_crt = NULL;
1658 cert_opt.output_file = make_certs_path(csp->config->certificate_directory,
1659 (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
1660 if (cert_opt.output_file == NULL)
1665 cert_opt.subject_key = make_certs_path(csp->config->certificate_directory,
1666 (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
1667 if (cert_opt.subject_key == NULL)
1669 freez(cert_opt.output_file);
1673 if (file_exists(cert_opt.output_file) == 1)
1675 /* The file exists, but is it valid? */
1676 if (ssl_certificate_is_invalid(cert_opt.output_file))
1678 log_error(LOG_LEVEL_CONNECT,
1679 "Certificate %s is no longer valid. Removing it.",
1680 cert_opt.output_file);
1681 if (unlink(cert_opt.output_file))
1683 log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
1684 cert_opt.output_file);
1686 freez(cert_opt.output_file);
1687 freez(cert_opt.subject_key);
1691 if (unlink(cert_opt.subject_key))
1693 log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
1694 cert_opt.subject_key);
1696 freez(cert_opt.output_file);
1697 freez(cert_opt.subject_key);
1704 freez(cert_opt.output_file);
1705 freez(cert_opt.subject_key);
1712 * Create key for requested host
1714 int subject_key_len = generate_key(csp, &key_buf);
1715 if (subject_key_len < 0)
1717 freez(cert_opt.output_file);
1718 freez(cert_opt.subject_key);
1719 log_error(LOG_LEVEL_ERROR, "Key generating failed");
1724 * Converting unsigned long serial number to char * serial number.
1725 * We must compute length of serial number in string + terminating null.
1727 unsigned long certificate_serial = get_certificate_serial(csp);
1728 unsigned long certificate_serial_time = (unsigned long)time(NULL);
1729 int serial_num_size = snprintf(NULL, 0, "%lu%lu",
1730 certificate_serial_time, certificate_serial) + 1;
1731 if (serial_num_size <= 0)
1733 serial_num_size = 1;
1736 char serial_num_text[serial_num_size]; /* Buffer for serial number */
1737 ret = snprintf(serial_num_text, (size_t)serial_num_size, "%lu%lu",
1738 certificate_serial_time, certificate_serial);
1739 if (ret < 0 || ret >= serial_num_size)
1741 log_error(LOG_LEVEL_ERROR,
1742 "Converting certificate serial number into string failed");
1748 * Preparing parameters for certificate
1750 subject_name = X509_NAME_new();
1753 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key memory allocation failure");
1758 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_COMMON_NAME_FCODE,
1759 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1761 log_ssl_errors(LOG_LEVEL_ERROR,
1762 "X509 subject name (code: %s, val: %s) error",
1763 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1767 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_ORGANIZATION_FCODE,
1768 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1770 log_ssl_errors(LOG_LEVEL_ERROR,
1771 "X509 subject name (code: %s, val: %s) error",
1772 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1776 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_ORG_UNIT_FCODE,
1777 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1779 log_ssl_errors(LOG_LEVEL_ERROR,
1780 "X509 subject name (code: %s, val: %s) error",
1781 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1785 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_COUNTRY_FCODE,
1786 MBSTRING_ASC, (void *)CERT_PARAM_COUNTRY_CODE, -1, -1, 0))
1788 log_ssl_errors(LOG_LEVEL_ERROR,
1789 "X509 subject name (code: %s, val: %s) error",
1790 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1795 cert_opt.issuer_crt = csp->config->ca_cert_file;
1796 cert_opt.issuer_key = csp->config->ca_key_file;
1798 if (get_certificate_valid_from_date(cert_valid_from,
1799 sizeof(cert_valid_from), VALID_DATETIME_FMT)
1800 || get_certificate_valid_to_date(cert_valid_to,
1801 sizeof(cert_valid_to), VALID_DATETIME_FMT))
1803 log_error(LOG_LEVEL_ERROR, "Generating one of the validity dates failed");
1808 cert_opt.subject_pwd = CERT_SUBJECT_PASSWORD;
1809 cert_opt.issuer_pwd = csp->config->ca_password;
1810 cert_opt.not_before = cert_valid_from;
1811 cert_opt.not_after = cert_valid_to;
1812 cert_opt.serial = serial_num_text;
1813 cert_opt.max_pathlen = -1;
1816 * Test if the private key was already created.
1817 * XXX: Can this still happen?
1819 if (subject_key_len == 0)
1821 log_error(LOG_LEVEL_ERROR, "Subject key was already created");
1827 * Parse serial to MPI
1829 serial_num = BN_new();
1832 log_error(LOG_LEVEL_ERROR, "generate_webpage_certificate: memory error");
1836 if (!BN_dec2bn(&serial_num, cert_opt.serial))
1838 log_ssl_errors(LOG_LEVEL_ERROR, "Failed to parse serial %s", cert_opt.serial);
1843 if (!(serial = BN_to_ASN1_INTEGER(serial_num, NULL)))
1845 log_ssl_errors(LOG_LEVEL_ERROR, "Failed to generate serial ASN1 representation");
1851 * Loading certificates
1853 if (!(issuer_cert = ssl_certificate_load(cert_opt.issuer_crt)))
1855 log_error(LOG_LEVEL_ERROR, "Loading issuer certificate %s failed",
1856 cert_opt.issuer_crt);
1861 issuer_name = X509_get_issuer_name(issuer_cert);
1864 * Loading keys from file or from buffer
1866 if (key_buf != NULL && subject_key_len > 0)
1868 pk_bio = BIO_new_mem_buf(key_buf, subject_key_len);
1870 else if (!(pk_bio = BIO_new_file(cert_opt.subject_key, "r")))
1872 log_ssl_errors(LOG_LEVEL_ERROR,
1873 "Failure opening subject key %s BIO", cert_opt.subject_key);
1878 loaded_subject_key = PEM_read_bio_PrivateKey(pk_bio, NULL, NULL,
1879 (void *)cert_opt.subject_pwd);
1880 if (!loaded_subject_key)
1882 log_ssl_errors(LOG_LEVEL_ERROR, "Parsing subject key %s failed",
1883 cert_opt.subject_key);
1888 if (!BIO_free(pk_bio))
1890 log_ssl_errors(LOG_LEVEL_ERROR, "Error closing subject key BIO");
1893 if (!(pk_bio = BIO_new_file(cert_opt.issuer_key, "r")))
1895 log_ssl_errors(LOG_LEVEL_ERROR, "Failure opening issuer key %s BIO",
1896 cert_opt.issuer_key);
1901 loaded_issuer_key = PEM_read_bio_PrivateKey(pk_bio, NULL, NULL,
1902 (void *)cert_opt.issuer_pwd);
1903 if (!loaded_issuer_key)
1905 log_ssl_errors(LOG_LEVEL_ERROR, "Parsing issuer key %s failed",
1906 cert_opt.subject_key);
1914 log_ssl_errors(LOG_LEVEL_ERROR, "Certificate allocation error");
1919 if (!X509_set_version(cert, CERTIFICATE_VERSION))
1921 log_ssl_errors(LOG_LEVEL_ERROR, "X509_set_version failed");
1927 * Setting parameters of signed certificate
1929 if (!X509_set_pubkey(cert, loaded_subject_key))
1931 log_ssl_errors(LOG_LEVEL_ERROR,
1932 "Setting issuer name in signed certificate failed");
1937 if (!X509_set_subject_name(cert, subject_name))
1939 log_ssl_errors(LOG_LEVEL_ERROR,
1940 "Setting issuer name in signed certificate failed");
1945 if (!X509_set_issuer_name(cert, issuer_name))
1947 log_ssl_errors(LOG_LEVEL_ERROR,
1948 "Setting issuer name in signed certificate failed");
1953 if (!X509_set_serialNumber(cert, serial))
1955 log_ssl_errors(LOG_LEVEL_ERROR,
1956 "Setting serial number in signed certificate failed");
1961 asn_time = ASN1_TIME_new();
1964 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time memory allocation failure");
1969 if (!ASN1_TIME_set_string(asn_time, cert_opt.not_after))
1971 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time [%s] encode error", cert_opt.not_after);
1976 if (!X509_set1_notAfter(cert, asn_time))
1978 log_ssl_errors(LOG_LEVEL_ERROR,
1979 "Setting valid not after in signed certificate failed");
1984 if (!ASN1_TIME_set_string(asn_time, cert_opt.not_before))
1986 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time encode error");
1991 if (!X509_set1_notBefore(cert, asn_time))
1993 log_ssl_errors(LOG_LEVEL_ERROR,
1994 "Setting valid not befre in signed certificate failed");
1999 if (!set_x509_ext(cert, issuer_cert, NID_basic_constraints, CERTIFICATE_BASIC_CONSTRAINTS))
2001 log_ssl_errors(LOG_LEVEL_ERROR, "Setting the basicConstraints extension "
2002 "in signed certificate failed");
2007 if (!set_x509_ext(cert, issuer_cert, NID_subject_key_identifier, CERTIFICATE_SUBJECT_KEY))
2009 log_ssl_errors(LOG_LEVEL_ERROR,
2010 "Setting the Subject Key Identifie extension failed");
2015 if (!set_x509_ext(cert, issuer_cert, NID_authority_key_identifier, CERTIFICATE_AUTHORITY_KEY))
2017 log_ssl_errors(LOG_LEVEL_ERROR,
2018 "Setting the Authority Key Identifier extension failed");
2023 if (!host_is_ip_address(csp->http->host) &&
2024 !set_subject_alternative_name(cert, issuer_cert, csp->http->host))
2026 log_ssl_errors(LOG_LEVEL_ERROR, "Setting the Subject Alt Nameextension failed");
2031 if (!X509_sign(cert, loaded_issuer_key, EVP_sha256()))
2033 log_ssl_errors(LOG_LEVEL_ERROR, "Signing certificate failed");
2039 * Writing certificate into file
2041 if (write_certificate(cert, cert_opt.output_file) < 0)
2043 log_error(LOG_LEVEL_ERROR, "Writing certificate into file failed");
2052 * Freeing used structures
2056 X509_free(issuer_cert);
2062 if (pk_bio && !BIO_free(pk_bio))
2064 log_ssl_errors(LOG_LEVEL_ERROR, "Error closing pk BIO");
2066 if (loaded_subject_key)
2068 EVP_PKEY_free(loaded_subject_key);
2070 if (loaded_issuer_key)
2072 EVP_PKEY_free(loaded_issuer_key);
2076 X509_NAME_free(subject_name);
2080 ASN1_TIME_free(asn_time);
2084 BN_free(serial_num);
2088 ASN1_INTEGER_free(serial);
2090 freez(cert_opt.subject_key);
2091 freez(cert_opt.output_file);
2098 /*********************************************************************
2100 * Function : ssl_crt_verify_info
2102 * Description : Returns an informational string about the verification
2103 * status of a certificate.
2106 * 1 : buf = Buffer to write to
2107 * 2 : size = Maximum size of buffer
2108 * 3 : csp = client state
2112 *********************************************************************/
2113 extern void ssl_crt_verify_info(char *buf, size_t size, struct client_state *csp)
2115 strncpy(buf, X509_verify_cert_error_string(csp->server_cert_verification_result), size);
2120 /*********************************************************************
2122 * Function : ssl_release
2124 * Description : Release all SSL resources
2130 *********************************************************************/
2131 extern void ssl_release(void)
2133 if (ssl_inited == 1)
2135 SSL_COMP_free_compression_methods();
2137 CONF_modules_free();
2138 CONF_modules_unload(1);
2140 COMP_zlib_cleanup();
2145 CRYPTO_cleanup_all_ex_data();