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
74 /*********************************************************************
76 * Function : openssl_init
78 * Description : Initializes OpenSSL library once
84 *********************************************************************/
85 static void openssl_init(void)
89 privoxy_mutex_lock(&ssl_init_mutex);
92 #if OPENSSL_VERSION_NUMBER < 0x10100000L
95 OPENSSL_init_ssl(0, NULL);
97 SSL_load_error_strings();
98 OpenSSL_add_ssl_algorithms();
101 privoxy_mutex_unlock(&ssl_init_mutex);
106 /*********************************************************************
108 * Function : is_ssl_pending
110 * Description : Tests if there are some waiting data on ssl connection.
111 * Only considers data that has actually been received
112 * locally and ignores data that is still on the fly
113 * or has not yet been sent by the remote end.
116 * 1 : ssl_attr = SSL context to test
118 * Returns : 0 => No data are pending
119 * >0 => Pending data length
121 *********************************************************************/
122 extern size_t is_ssl_pending(struct ssl_attr *ssl_attr)
124 BIO *bio = ssl_attr->openssl_attr.bio;
130 return (size_t)BIO_pending(bio);
134 /*********************************************************************
136 * Function : ssl_send_data
138 * Description : Sends the content of buf (for n bytes) to given SSL
139 * connection context.
142 * 1 : ssl_attr = SSL context to send data to
143 * 2 : buf = Pointer to data to be sent
144 * 3 : len = Length of data to be sent to the SSL context
146 * Returns : Length of sent data or negative value on error.
148 *********************************************************************/
149 extern int ssl_send_data(struct ssl_attr *ssl_attr, const unsigned char *buf, size_t len)
151 BIO *bio = ssl_attr->openssl_attr.bio;
153 int pos = 0; /* Position of unsent part in buffer */
162 int send_len = (int)len - pos;
164 log_error(LOG_LEVEL_WRITING, "TLS: %N", send_len, buf+pos);
167 * Sending one part of the buffer
169 while ((ret = BIO_write(bio,
170 (const unsigned char *)(buf + pos),
173 if (!BIO_should_retry(bio))
175 log_ssl_errors(LOG_LEVEL_ERROR,
176 "Sending data over TLS/SSL failed");
180 /* Adding count of sent bytes to position in buffer */
188 /*********************************************************************
190 * Function : ssl_recv_data
192 * Description : Receives data from given SSL context and puts
196 * 1 : ssl_attr = SSL context to receive data from
197 * 2 : buf = Pointer to buffer where data will be written
198 * 3 : max_length = Maximum number of bytes to read
200 * Returns : Number of bytes read, 0 for EOF, or -1
203 *********************************************************************/
204 extern int ssl_recv_data(struct ssl_attr *ssl_attr, unsigned char *buf, size_t max_length)
206 BIO *bio = ssl_attr->openssl_attr.bio;
208 memset(buf, 0, max_length);
211 * Receiving data from SSL context into buffer
215 ret = BIO_read(bio, buf, (int)max_length);
216 } while (ret <= 0 && BIO_should_retry(bio));
220 log_ssl_errors(LOG_LEVEL_ERROR,
221 "Receiving data over TLS/SSL failed");
226 log_error(LOG_LEVEL_RECEIVED, "TLS: %N", ret, buf);
232 /*********************************************************************
234 * Function : ssl_store_cert
236 * Description : This is a callback function for certificate verification.
237 * It's called once for each certificate in the server's
238 * certificate trusted chain and prepares information about
239 * the certificate. The information can be used to inform
240 * the user about invalid certificates.
243 * 1 : csp = Current client state (buffers, headers, etc...)
244 * 2 : crt = certificate from trusted chain
246 * Returns : 0 on success and negative value on error
248 *********************************************************************/
249 static int ssl_store_cert(struct client_state *csp, X509* crt)
252 struct certs_chain *last = &(csp->server_certs_chain);
254 BIO *bio = BIO_new(BIO_s_mem());
255 EVP_PKEY *pkey = NULL;
256 char *bio_mem_data = 0;
259 const ASN1_INTEGER *bs;
260 const X509_ALGOR *tsig_alg;
265 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new_mem_buf() failed");
270 * Searching for last item in certificates linked list
272 while (last->next != NULL)
278 * Preparing next item in linked list for next certificate
280 last->next = malloc_or_die(sizeof(struct certs_chain));
281 last->next->next = NULL;
282 memset(last->next->info_buf, 0, sizeof(last->next->info_buf));
283 memset(last->next->file_buf, 0, sizeof(last->next->file_buf));
286 * Saving certificate file into buffer
288 if (!PEM_write_bio_X509(bio, crt))
290 log_ssl_errors(LOG_LEVEL_ERROR, "PEM_write_X509() failed");
295 len = BIO_get_mem_data(bio, &bio_mem_data);
297 if (len > (sizeof(last->file_buf) - 1))
299 log_error(LOG_LEVEL_ERROR,
300 "X509 PEM cert len %d is larger then buffer len %s",
301 len, sizeof(last->file_buf) - 1);
302 len = sizeof(last->file_buf) - 1;
305 strncpy(last->file_buf, bio_mem_data, (size_t)len);
307 bio = BIO_new(BIO_s_mem());
310 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new_mem_buf() failed");
316 * Saving certificate information into buffer
318 l = X509_get_version(crt);
319 if (l >= 0 && l <= 2)
321 if (BIO_printf(bio, "cert. version : %ld\n", l + 1) <= 0)
323 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for version failed");
330 if (BIO_printf(bio, "cert. version : Unknown (%ld)\n", l) <= 0)
332 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for version failed");
338 if (BIO_puts(bio, "serial number : ") <= 0)
340 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_write() for serial failed");
344 bs = X509_get0_serialNumber(crt);
345 if (bs->length <= (int)sizeof(long))
348 l = ASN1_INTEGER_get(bs);
359 if (bs->type == V_ASN1_NEG_INTEGER)
361 ul = 0 - (unsigned long)l;
366 ul = (unsigned long)l;
369 if (BIO_printf(bio, " %s%lu (%s0x%lx)\n", neg, ul, neg, ul) <= 0)
371 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for serial failed");
378 if (bs->type == V_ASN1_NEG_INTEGER)
380 if (BIO_puts(bio, " (Negative)") < 0)
382 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for serial failed");
387 for (int i = 0; i < bs->length; i++)
389 if (BIO_printf(bio, "%02x%c", bs->data[i],
390 ((i + 1 == bs->length) ? '\n' : ':')) <= 0)
392 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for serial failed");
399 if (BIO_puts(bio, "issuer name : ") <= 0)
401 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for issuer failed");
405 if (X509_NAME_print_ex(bio, X509_get_issuer_name(crt), 0, 0) < 0)
407 log_ssl_errors(LOG_LEVEL_ERROR, "X509_NAME_print_ex() for issuer failed");
412 if (BIO_puts(bio, "\nsubject name : ") <= 0)
414 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for sublect failed");
418 if (X509_NAME_print_ex(bio, X509_get_subject_name(crt), 0, 0) < 0) {
419 log_ssl_errors(LOG_LEVEL_ERROR, "X509_NAME_print_ex() for subject failed");
424 if (BIO_puts(bio, "\nissued on : ") <= 0)
426 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for issued on failed");
430 if (!ASN1_TIME_print(bio, X509_get0_notBefore(crt)))
432 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_TIME_print() for issued on failed");
437 if (BIO_puts(bio, "\nexpires on : ") <= 0)
439 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for expires on failed");
443 if (!ASN1_TIME_print(bio, X509_get0_notAfter(crt)))
445 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_TIME_print() for expires on failed");
450 if (BIO_puts(bio, "\nsigned using : ") <= 0)
452 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for signed using failed");
456 tsig_alg = X509_get0_tbs_sigalg(crt);
457 if (!i2a_ASN1_OBJECT(bio, tsig_alg->algorithm))
459 log_ssl_errors(LOG_LEVEL_ERROR, "i2a_ASN1_OBJECT() for signed using on failed");
463 pkey = X509_get_pubkey(crt);
466 log_ssl_errors(LOG_LEVEL_ERROR, "X509_get_pubkey() failed");
471 switch (EVP_PKEY_base_id(pkey))
474 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "RSA key size", EVP_PKEY_bits(pkey));
477 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "DSA key size", EVP_PKEY_bits(pkey));
480 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "non-RSA/DSA key size", EVP_PKEY_bits(pkey));
485 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for key size failed");
490 loc = X509_get_ext_by_NID(crt, NID_basic_constraints, -1);
493 X509_EXTENSION *ex = X509_get_ext(crt, loc);
494 if (BIO_puts(bio, "\nbasic constraints : ") <= 0)
496 log_ssl_errors(LOG_LEVEL_ERROR,
497 "BIO_printf() for basic constraints failed");
501 if (!X509V3_EXT_print(bio, ex, 0, 0))
503 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex), ASN1_STRFLGS_RFC2253))
505 log_ssl_errors(LOG_LEVEL_ERROR,
506 "ASN1_STRING_print_ex() for basic constraints failed");
513 loc = X509_get_ext_by_NID(crt, NID_subject_alt_name, -1);
516 X509_EXTENSION *ex = X509_get_ext(crt, loc);
517 if (BIO_puts(bio, "\nsubject alt name : ") <= 0)
519 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for alt name failed");
523 if (!X509V3_EXT_print(bio, ex, 0, 0))
525 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
526 ASN1_STRFLGS_RFC2253))
528 log_ssl_errors(LOG_LEVEL_ERROR,
529 "ASN1_STRING_print_ex() for alt name failed");
536 loc = X509_get_ext_by_NID(crt, NID_netscape_cert_type, -1);
539 X509_EXTENSION *ex = X509_get_ext(crt, loc);
540 if (BIO_puts(bio, "\ncert. type : ") <= 0)
542 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for cert type failed");
546 if (!X509V3_EXT_print(bio, ex, 0, 0))
548 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
549 ASN1_STRFLGS_RFC2253))
551 log_ssl_errors(LOG_LEVEL_ERROR,
552 "ASN1_STRING_print_ex() for cert type failed");
559 loc = X509_get_ext_by_NID(crt, NID_key_usage, -1);
562 X509_EXTENSION *ex = X509_get_ext(crt, loc);
563 if (BIO_puts(bio, "\nkey usage : ") <= 0)
565 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for key usage failed");
569 if (!X509V3_EXT_print(bio, ex, 0, 0))
571 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
572 ASN1_STRFLGS_RFC2253))
574 log_ssl_errors(LOG_LEVEL_ERROR,
575 "ASN1_STRING_print_ex() for key usage failed");
582 loc = X509_get_ext_by_NID(crt, NID_ext_key_usage, -1);
584 X509_EXTENSION *ex = X509_get_ext(crt, loc);
585 if (BIO_puts(bio, "\next key usage : ") <= 0)
587 log_ssl_errors(LOG_LEVEL_ERROR,
588 "BIO_printf() for ext key usage failed");
592 if (!X509V3_EXT_print(bio, ex, 0, 0))
594 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
595 ASN1_STRFLGS_RFC2253))
597 log_ssl_errors(LOG_LEVEL_ERROR,
598 "ASN1_STRING_print_ex() for ext key usage failed");
605 loc = X509_get_ext_by_NID(crt, NID_certificate_policies, -1);
608 X509_EXTENSION *ex = X509_get_ext(crt, loc);
609 if (BIO_puts(bio, "\ncertificate policies : ") <= 0)
611 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for certificate policies failed");
615 if (!X509V3_EXT_print(bio, ex, 0, 0))
617 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
618 ASN1_STRFLGS_RFC2253))
620 log_ssl_errors(LOG_LEVEL_ERROR,
621 "ASN1_STRING_print_ex() for certificate policies failed");
628 /* make valgrind happy */
629 static const char zero = 0;
630 BIO_write(bio, &zero, 1);
632 len = BIO_get_mem_data(bio, &bio_mem_data);
633 encoded_text = html_encode(bio_mem_data);
634 strlcpy(last->info_buf, encoded_text, sizeof(last->info_buf));
651 /*********************************************************************
653 * Function : host_to_hash
655 * Description : Creates MD5 hash from host name. Host name is loaded
656 * from structure csp and saved again into it.
659 * 1 : csp = Current client state (buffers, headers, etc...)
661 * Returns : 1 => Error while creating hash
662 * 0 => Hash created successfully
664 *********************************************************************/
665 static int host_to_hash(struct client_state *csp)
669 memset(csp->http->hash_of_host, 0, sizeof(csp->http->hash_of_host));
670 MD5((unsigned char *)csp->http->host, strlen(csp->http->host),
671 csp->http->hash_of_host);
673 /* Converting hash into string with hex */
677 if ((ret = sprintf((char *)csp->http->hash_of_host_hex + 2 * i, "%02x",
678 csp->http->hash_of_host[i])) < 0)
680 log_error(LOG_LEVEL_ERROR, "Sprintf return value: %d", ret);
689 /*********************************************************************
691 * Function : create_client_ssl_connection
693 * Description : Creates TLS/SSL secured connection with client
696 * 1 : csp = Current client state (buffers, headers, etc...)
698 * Returns : 0 on success, negative value if connection wasn't created
701 *********************************************************************/
702 extern int create_client_ssl_connection(struct client_state *csp)
704 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
705 /* Paths to certificates file and key file */
706 char *key_file = NULL;
707 char *ca_file = NULL;
708 char *cert_file = NULL;
713 * Initializing OpenSSL structures for TLS/SSL connection
718 * Preparing hash of host for creating certificates
720 ret = host_to_hash(csp);
723 log_error(LOG_LEVEL_ERROR, "Generating hash of host failed: %d", ret);
729 * Preparing paths to certificates files and key file
731 ca_file = csp->config->ca_cert_file;
732 cert_file = make_certs_path(csp->config->certificate_directory,
733 (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
734 key_file = make_certs_path(csp->config->certificate_directory,
735 (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
737 if (cert_file == NULL || key_file == NULL)
744 * Generating certificate for requested host. Mutex to prevent
745 * certificate and key inconsistence must be locked.
747 privoxy_mutex_lock(&certificate_mutex);
749 ret = generate_webpage_certificate(csp);
752 log_error(LOG_LEVEL_ERROR,
753 "Generate_webpage_certificate failed: %d", ret);
754 privoxy_mutex_unlock(&certificate_mutex);
758 privoxy_mutex_unlock(&certificate_mutex);
760 if (!(ssl_attr->openssl_attr.ctx = SSL_CTX_new(SSLv23_server_method())))
762 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create SSL context");
767 /* Set the key and cert */
768 if (SSL_CTX_use_certificate_file(ssl_attr->openssl_attr.ctx,
769 cert_file, SSL_FILETYPE_PEM) != 1)
771 log_ssl_errors(LOG_LEVEL_ERROR,
772 "Loading webpage certificate %s failed", cert_file);
777 if (SSL_CTX_use_PrivateKey_file(ssl_attr->openssl_attr.ctx,
778 key_file, SSL_FILETYPE_PEM) != 1)
780 log_ssl_errors(LOG_LEVEL_ERROR,
781 "Loading webpage certificate private key %s failed", key_file);
786 SSL_CTX_set_options(ssl_attr->openssl_attr.ctx, SSL_OP_NO_SSLv3);
788 if (!(ssl_attr->openssl_attr.bio = BIO_new_ssl(ssl_attr->openssl_attr.ctx, 0)))
790 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create BIO structure");
795 if (BIO_get_ssl(ssl_attr->openssl_attr.bio, &ssl) != 1)
797 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_get_ssl failed");
802 if (!SSL_set_fd(ssl, csp->cfd))
804 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_fd failed");
810 * Handshake with client
812 log_error(LOG_LEVEL_CONNECT,
813 "Performing the TLS/SSL handshake with client. Hash of host: %s",
814 csp->http->hash_of_host_hex);
815 if (BIO_do_handshake(ssl_attr->openssl_attr.bio) != 1)
817 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_do_handshake failed");
822 log_error(LOG_LEVEL_CONNECT, "Client successfully connected over TLS/SSL");
823 csp->ssl_with_client_is_opened = 1;
828 * Freeing allocated paths to files
833 /* Freeing structures if connection wasn't created successfully */
836 free_client_ssl_structures(csp);
842 /*********************************************************************
844 * Function : close_client_ssl_connection
846 * Description : Closes TLS/SSL connection with client. This function
847 * checks if this connection is already created.
850 * 1 : csp = Current client state (buffers, headers, etc...)
854 *********************************************************************/
855 extern void close_client_ssl_connection(struct client_state *csp)
857 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
859 if (csp->ssl_with_client_is_opened == 0)
865 * Notifying the peer that the connection is being closed.
867 BIO_ssl_shutdown(ssl_attr->openssl_attr.bio);
868 free_client_ssl_structures(csp);
869 csp->ssl_with_client_is_opened = 0;
873 /*********************************************************************
875 * Function : free_client_ssl_structures
877 * Description : Frees structures used for SSL communication with
881 * 1 : csp = Current client state (buffers, headers, etc...)
885 *********************************************************************/
886 static void free_client_ssl_structures(struct client_state *csp)
888 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
890 if (ssl_attr->openssl_attr.bio)
892 BIO_free_all(ssl_attr->openssl_attr.bio);
894 if (ssl_attr->openssl_attr.ctx)
896 SSL_CTX_free(ssl_attr->openssl_attr.ctx);
901 /*********************************************************************
903 * Function : close_server_ssl_connection
905 * Description : Closes TLS/SSL connection with server. This function
906 * checks if this connection is already opened.
909 * 1 : csp = Current client state (buffers, headers, etc...)
913 *********************************************************************/
914 extern void close_server_ssl_connection(struct client_state *csp)
916 struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
918 if (csp->ssl_with_server_is_opened == 0)
924 * Notifying the peer that the connection is being closed.
926 BIO_ssl_shutdown(ssl_attr->openssl_attr.bio);
927 free_server_ssl_structures(csp);
928 csp->ssl_with_server_is_opened = 0;
932 /*********************************************************************
934 * Function : create_server_ssl_connection
936 * Description : Creates TLS/SSL secured connection with server.
939 * 1 : csp = Current client state (buffers, headers, etc...)
941 * Returns : 0 on success, negative value if connection wasn't created
944 *********************************************************************/
945 extern int create_server_ssl_connection(struct client_state *csp)
947 openssl_connection_attr *ssl_attrs = &csp->ssl_server_attr.openssl_attr;
949 char *trusted_cas_file = NULL;
950 STACK_OF(X509) *chain;
953 csp->server_cert_verification_result = SSL_CERT_NOT_VERIFIED;
954 csp->server_certs_chain.next = NULL;
956 /* Setting path to file with trusted CAs */
957 trusted_cas_file = csp->config->trusted_cas_file;
959 ssl_attrs->ctx = SSL_CTX_new(SSLv23_method());
962 log_ssl_errors(LOG_LEVEL_ERROR, "SSL context creation failed");
968 * Loading file with trusted CAs
970 if (!SSL_CTX_load_verify_locations(ssl_attrs->ctx, trusted_cas_file, NULL))
972 log_ssl_errors(LOG_LEVEL_ERROR, "Loading trusted CAs file %s failed",
978 SSL_CTX_set_verify(ssl_attrs->ctx, SSL_VERIFY_NONE, NULL);
979 SSL_CTX_set_options(ssl_attrs->ctx, SSL_OP_NO_SSLv3);
981 if (!(ssl_attrs->bio = BIO_new_ssl(ssl_attrs->ctx, 1)))
983 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create BIO structure");
988 if (BIO_get_ssl(ssl_attrs->bio, &ssl) != 1)
990 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_get_ssl failed");
995 if (!SSL_set_fd(ssl, csp->server_connection.sfd))
997 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_fd failed");
1003 * Set the hostname to check against the received server certificate
1005 if (!SSL_set1_host(ssl, csp->http->host))
1007 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set1_host failed");
1013 if (!SSL_set_tlsext_host_name(ssl, csp->http->host))
1015 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_tlsext_host_name failed");
1021 * Handshake with server
1023 log_error(LOG_LEVEL_CONNECT,
1024 "Performing the TLS/SSL handshake with the server");
1026 if (BIO_do_handshake(ssl_attrs->bio) != 1)
1028 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_do_handshake failed");
1033 chain = SSL_get_peer_cert_chain(ssl);
1036 for (int i = 0; i < sk_X509_num(chain); i++)
1038 if (ssl_store_cert(csp, sk_X509_value(chain, i)) != 0)
1040 log_error(LOG_LEVEL_ERROR, "ssl_store_cert failed");
1047 if (!csp->dont_verify_certificate)
1049 long verify_result = SSL_get_verify_result(ssl);
1050 if (verify_result == X509_V_OK)
1053 csp->server_cert_verification_result = SSL_CERT_VALID;
1057 csp->server_cert_verification_result = verify_result;
1058 log_error(LOG_LEVEL_ERROR, "SSL_get_verify_result failed: %s",
1059 X509_verify_cert_error_string(verify_result));
1065 log_error(LOG_LEVEL_CONNECT, "Server successfully connected over TLS/SSL");
1068 * Server certificate chain is valid, so we can clean
1069 * chain, because we will not send it to client.
1071 free_certificate_chain(csp);
1073 csp->ssl_with_server_is_opened = 1;
1075 /* Freeing structures if connection wasn't created successfully */
1078 free_server_ssl_structures(csp);
1085 /*********************************************************************
1087 * Function : free_server_ssl_structures
1089 * Description : Frees structures used for SSL communication with server
1092 * 1 : csp = Current client state (buffers, headers, etc...)
1096 *********************************************************************/
1097 static void free_server_ssl_structures(struct client_state *csp)
1099 struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
1101 if (ssl_attr->openssl_attr.bio)
1103 BIO_free_all(ssl_attr->openssl_attr.bio);
1105 if (ssl_attr->openssl_attr.ctx)
1107 SSL_CTX_free(ssl_attr->openssl_attr.ctx);
1112 /*********************************************************************
1114 * Function : log_ssl_errors
1116 * Description : Log SSL errors
1119 * 1 : debuglevel = Debug level
1120 * 2 : desc = Error description
1124 *********************************************************************/
1125 static void log_ssl_errors(int debuglevel, const char* fmt, ...)
1127 unsigned long err_code;
1128 char prefix[ERROR_BUF_SIZE];
1130 va_start(args, fmt);
1131 vsnprintf(prefix, sizeof(prefix), fmt, args);
1134 while ((err_code = ERR_get_error()))
1136 char err_buf[ERROR_BUF_SIZE];
1138 ERR_error_string_n(err_code, err_buf, sizeof(err_buf));
1139 log_error(debuglevel, "%s: %s", prefix, err_buf);
1143 * In case if called by mistake and there were
1144 * no SSL errors let's report it to the log.
1148 log_error(debuglevel, "%s: no ssl errors detected", prefix);
1153 /*********************************************************************
1155 * Function : ssl_base64_encode
1157 * Description : Encode a buffer into base64 format.
1160 * 1 : dst = Destination buffer
1161 * 2 : dlen = Destination buffer length
1162 * 3 : olen = Number of bytes written
1163 * 4 : src = Source buffer
1164 * 5 : slen = Amount of data to be encoded
1166 * Returns : 0 on success, error code othervise
1168 *********************************************************************/
1169 extern int ssl_base64_encode(unsigned char *dst, size_t dlen, size_t *olen,
1170 const unsigned char *src, size_t slen)
1172 *olen = 4 * ((slen/3) + ((slen%3) ? 1 : 0)) + 1;
1177 *olen = (size_t)EVP_EncodeBlock(dst, src, (int)slen) + 1;
1182 /*********************************************************************
1184 * Function : close_file_stream
1186 * Description : Close file stream, report error on close error
1189 * 1 : f = file stream to close
1190 * 2 : path = path for error report
1194 *********************************************************************/
1195 static void close_file_stream(FILE *f, const char *path)
1199 log_error(LOG_LEVEL_ERROR,
1200 "Error closing file %s: %s", path, strerror(errno));
1205 /*********************************************************************
1207 * Function : write_certificate
1209 * Description : Writes certificate into file.
1212 * 1 : crt = certificate to write into file
1213 * 2 : output_file = path to save certificate file
1216 * Returns : 1 on success success or negative value
1218 *********************************************************************/
1219 static int write_certificate(X509 *crt, const char *output_file)
1225 * Saving certificate into file
1227 if ((f = fopen(output_file, "w")) == NULL)
1229 log_error(LOG_LEVEL_ERROR, "Opening file %s to save certificate failed",
1234 ret = PEM_write_X509(f, crt);
1237 log_ssl_errors(LOG_LEVEL_ERROR,
1238 "Writing certificate into file %s failed", output_file);
1242 close_file_stream(f, output_file);
1247 /*********************************************************************
1249 * Function : write_private_key
1251 * Description : Writes private key into file and copies saved
1252 * content into given pointer to string. If function
1253 * returns 0 for success, this copy must be freed by
1257 * 1 : key = key to write into file
1258 * 2 : ret_buf = pointer to string with created key file content
1259 * 3 : key_file_path = path where to save key file
1261 * Returns : Length of written private key on success or negative value
1264 *********************************************************************/
1265 static int write_private_key(EVP_PKEY *key, char **ret_buf,
1266 const char *key_file_path)
1268 size_t len = 0; /* Length of created key */
1269 FILE *f = NULL; /* File to save certificate */
1271 BIO *bio_mem = BIO_new(BIO_s_mem());
1272 char *bio_mem_data = 0;
1274 if (bio_mem == NULL)
1276 log_ssl_errors(LOG_LEVEL_ERROR, "write_private_key memory allocation failure");
1281 * Writing private key into PEM string
1283 if (!PEM_write_bio_PrivateKey(bio_mem, key, NULL, NULL, 0, NULL, NULL))
1285 log_ssl_errors(LOG_LEVEL_ERROR,
1286 "Writing private key into PEM string failed");
1291 len = (size_t)BIO_get_mem_data(bio_mem, &bio_mem_data);
1293 /* Initializing buffer for key file content */
1294 *ret_buf = zalloc_or_die(len + 1);
1295 (*ret_buf)[len] = 0;
1297 strncpy(*ret_buf, bio_mem_data, len);
1300 * Saving key into file
1302 if ((f = fopen(key_file_path, "wb")) == NULL)
1304 log_error(LOG_LEVEL_ERROR,
1305 "Opening file %s to save private key failed: %E",
1311 if (fwrite(*ret_buf, 1, len, f) != len)
1313 log_error(LOG_LEVEL_ERROR,
1314 "Writing private key into file %s failed",
1316 close_file_stream(f, key_file_path);
1321 close_file_stream(f, key_file_path);
1335 /*********************************************************************
1337 * Function : generate_key
1339 * Description : Tests if private key for host saved in csp already
1340 * exists. If this file doesn't exists, a new key is
1341 * generated and saved in a file. The generated key is also
1342 * copied into given parameter key_buf, which must be then
1343 * freed by caller. If file with key exists, key_buf
1344 * contain NULL and no private key is generated.
1347 * 1 : csp = Current client state (buffers, headers, etc...)
1348 * 2 : key_buf = buffer to save new generated key
1350 * Returns : -1 => Error while generating private key
1351 * 0 => Key already exists
1352 * >0 => Length of generated private key
1354 *********************************************************************/
1355 static int generate_key(struct client_state *csp, char **key_buf)
1358 char* key_file_path = NULL;
1359 BIGNUM *exp = BN_new();
1360 RSA *rsa = RSA_new();
1361 EVP_PKEY *key = EVP_PKEY_new();
1363 if (exp == NULL || rsa == NULL || key == NULL)
1365 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key memory allocation failure");
1370 BN_set_word(exp, RSA_KEY_PUBLIC_EXPONENT);
1372 key_file_path = make_certs_path(csp->config->certificate_directory,
1373 (char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
1374 if (key_file_path == NULL)
1381 * Test if key already exists. If so, we don't have to create it again.
1383 if (file_exists(key_file_path) == 1)
1389 ret = RSA_generate_key_ex(rsa, RSA_KEYSIZE, exp, NULL);
1392 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key generation failure");
1397 if (!EVP_PKEY_set1_RSA(key, rsa))
1399 log_ssl_errors(LOG_LEVEL_ERROR,
1400 "Error assigning RSA key pair to PKEY structure");
1406 * Exporting private key into file
1408 if ((ret = write_private_key(key, key_buf, key_file_path)) < 0)
1410 log_error(LOG_LEVEL_ERROR,
1411 "Writing private key into file %s failed", key_file_path);
1418 * Freeing used variables
1432 freez(key_file_path);
1438 /*********************************************************************
1440 * Function : ssl_certificate_load
1442 * Description : Loads certificate from file.
1445 * 1 : cert_path = The certificate path to load
1447 * Returns : NULL => error loading certificate,
1448 * pointer to certificate instance otherwise
1450 *********************************************************************/
1451 static X509* ssl_certificate_load(const char *cert_path)
1454 FILE *cert_f = NULL;
1456 if (!(cert_f = fopen(cert_path, "r")))
1458 log_error(LOG_LEVEL_ERROR,
1459 "Error opening certificate file %s: %s", cert_path, strerror(errno));
1463 if (!(cert = PEM_read_X509(cert_f, NULL, NULL, NULL)))
1465 log_ssl_errors(LOG_LEVEL_ERROR,
1466 "Error reading certificate file %s", cert_path);
1469 close_file_stream(cert_f, cert_path);
1474 /*********************************************************************
1476 * Function : ssl_certificate_is_invalid
1478 * Description : Checks whether or not a certificate is valid.
1479 * Currently only checks that the certificate can be
1480 * parsed and that the "valid to" date is in the future.
1483 * 1 : cert_file = The certificate to check
1485 * Returns : 0 => The certificate is valid.
1486 * 1 => The certificate is invalid
1488 *********************************************************************/
1489 static int ssl_certificate_is_invalid(const char *cert_file)
1495 if (!(cert = ssl_certificate_load(cert_file)))
1497 log_ssl_errors(LOG_LEVEL_ERROR,
1498 "Error reading certificate file %s", cert_file);
1502 ret = X509_cmp_current_time(X509_get_notAfter(cert));
1505 log_ssl_errors(LOG_LEVEL_ERROR,
1506 "Error checking certificate %s validity", cert_file);
1511 return ret == -1 ? 1 : 0;
1515 /*********************************************************************
1517 * Function : set_x509_ext
1519 * Description : Sets the X509V3 extension data
1522 * 1 : cert = The certificate to modify
1523 * 2 : issuer = Issuer certificate
1524 * 3 : nid = OpenSSL NID
1525 * 4 : value = extension value
1527 * Returns : 0 => Error while setting extensuon data
1530 *********************************************************************/
1531 static int set_x509_ext(X509 *cert, X509 *issuer, int nid, char *value)
1533 X509_EXTENSION *ext = NULL;
1537 X509V3_set_ctx(&ctx, issuer, cert, NULL, NULL, 0);
1538 ext = X509V3_EXT_conf_nid(NULL, &ctx, nid, value);
1541 log_ssl_errors(LOG_LEVEL_ERROR, "X509V3_EXT_conf_nid failure");
1545 if (!X509_add_ext(cert, ext, -1))
1547 log_ssl_errors(LOG_LEVEL_ERROR, "X509_add_ext failure");
1555 X509_EXTENSION_free(ext);
1561 /*********************************************************************
1563 * Function : set_subject_alternative_name
1565 * Description : Sets the Subject Alternative Name extension to a cert
1568 * 1 : cert = The certificate to modify
1569 * 2 : issuer = Issuer certificate
1570 * 3 : hostname = The hostname to add
1572 * Returns : 0 => Error while creating certificate.
1575 *********************************************************************/
1576 static int set_subject_alternative_name(X509 *cert, X509 *issuer, const char *hostname)
1578 size_t altname_len = strlen(hostname) + sizeof(CERTIFICATE_ALT_NAME_PREFIX);
1579 char alt_name_buf[altname_len];
1581 snprintf(alt_name_buf, sizeof(alt_name_buf),
1582 CERTIFICATE_ALT_NAME_PREFIX"%s", hostname);
1583 return set_x509_ext(cert, issuer, NID_subject_alt_name, alt_name_buf);
1587 /*********************************************************************
1589 * Function : generate_webpage_certificate
1591 * Description : Creates certificate file in presetted directory.
1592 * If certificate already exists, no other certificate
1593 * will be created. Subject of certificate is named
1594 * by csp->http->host from parameter. This function also
1595 * triggers generating of private key for new certificate.
1598 * 1 : csp = Current client state (buffers, headers, etc...)
1600 * Returns : -1 => Error while creating certificate.
1601 * 0 => Certificate already exists.
1602 * 1 => Certificate created
1604 *********************************************************************/
1605 static int generate_webpage_certificate(struct client_state *csp)
1607 char *key_buf = NULL; /* Buffer for created key */
1608 X509 *issuer_cert = NULL;
1611 EVP_PKEY *loaded_subject_key = NULL;
1612 EVP_PKEY *loaded_issuer_key = NULL;
1613 X509_NAME *issuer_name;
1614 X509_NAME *subject_name = NULL;
1615 ASN1_TIME *asn_time = NULL;
1616 ASN1_INTEGER *serial = NULL;
1617 BIGNUM *serial_num = NULL;
1620 cert_options cert_opt;
1621 char cert_valid_from[VALID_DATETIME_BUFLEN];
1622 char cert_valid_to[VALID_DATETIME_BUFLEN];
1624 /* Paths to keys and certificates needed to create certificate */
1625 cert_opt.issuer_key = NULL;
1626 cert_opt.subject_key = NULL;
1627 cert_opt.issuer_crt = NULL;
1629 cert_opt.output_file = make_certs_path(csp->config->certificate_directory,
1630 (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
1631 if (cert_opt.output_file == NULL)
1636 cert_opt.subject_key = make_certs_path(csp->config->certificate_directory,
1637 (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
1638 if (cert_opt.subject_key == NULL)
1640 freez(cert_opt.output_file);
1644 if (file_exists(cert_opt.output_file) == 1)
1646 /* The file exists, but is it valid? */
1647 if (ssl_certificate_is_invalid(cert_opt.output_file))
1649 log_error(LOG_LEVEL_CONNECT,
1650 "Certificate %s is no longer valid. Removing it.",
1651 cert_opt.output_file);
1652 if (unlink(cert_opt.output_file))
1654 log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
1655 cert_opt.output_file);
1657 freez(cert_opt.output_file);
1658 freez(cert_opt.subject_key);
1662 if (unlink(cert_opt.subject_key))
1664 log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
1665 cert_opt.subject_key);
1667 freez(cert_opt.output_file);
1668 freez(cert_opt.subject_key);
1675 freez(cert_opt.output_file);
1676 freez(cert_opt.subject_key);
1683 * Create key for requested host
1685 int subject_key_len = generate_key(csp, &key_buf);
1686 if (subject_key_len < 0)
1688 freez(cert_opt.output_file);
1689 freez(cert_opt.subject_key);
1690 log_error(LOG_LEVEL_ERROR, "Key generating failed");
1695 * Converting unsigned long serial number to char * serial number.
1696 * We must compute length of serial number in string + terminating null.
1698 unsigned long certificate_serial = get_certificate_serial(csp);
1699 unsigned long certificate_serial_time = (unsigned long)time(NULL);
1700 int serial_num_size = snprintf(NULL, 0, "%lu%lu",
1701 certificate_serial_time, certificate_serial) + 1;
1702 if (serial_num_size <= 0)
1704 serial_num_size = 1;
1707 char serial_num_text[serial_num_size]; /* Buffer for serial number */
1708 ret = snprintf(serial_num_text, (size_t)serial_num_size, "%lu%lu",
1709 certificate_serial_time, certificate_serial);
1710 if (ret < 0 || ret >= serial_num_size)
1712 log_error(LOG_LEVEL_ERROR,
1713 "Converting certificate serial number into string failed");
1719 * Preparing parameters for certificate
1721 subject_name = X509_NAME_new();
1724 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key memory allocation failure");
1729 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_COMMON_NAME_FCODE,
1730 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1732 log_ssl_errors(LOG_LEVEL_ERROR,
1733 "X509 subject name (code: %s, val: %s) error",
1734 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1738 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_ORGANIZATION_FCODE,
1739 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1741 log_ssl_errors(LOG_LEVEL_ERROR,
1742 "X509 subject name (code: %s, val: %s) error",
1743 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1747 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_ORG_UNIT_FCODE,
1748 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1750 log_ssl_errors(LOG_LEVEL_ERROR,
1751 "X509 subject name (code: %s, val: %s) error",
1752 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1756 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_COUNTRY_FCODE,
1757 MBSTRING_ASC, (void *)CERT_PARAM_COUNTRY_CODE, -1, -1, 0))
1759 log_ssl_errors(LOG_LEVEL_ERROR,
1760 "X509 subject name (code: %s, val: %s) error",
1761 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1766 cert_opt.issuer_crt = csp->config->ca_cert_file;
1767 cert_opt.issuer_key = csp->config->ca_key_file;
1769 if (get_certificate_valid_from_date(cert_valid_from,
1770 sizeof(cert_valid_from), VALID_DATETIME_FMT)
1771 || get_certificate_valid_to_date(cert_valid_to,
1772 sizeof(cert_valid_to), VALID_DATETIME_FMT))
1774 log_error(LOG_LEVEL_ERROR, "Generating one of the validity dates failed");
1779 cert_opt.subject_pwd = CERT_SUBJECT_PASSWORD;
1780 cert_opt.issuer_pwd = csp->config->ca_password;
1781 cert_opt.not_before = cert_valid_from;
1782 cert_opt.not_after = cert_valid_to;
1783 cert_opt.serial = serial_num_text;
1784 cert_opt.max_pathlen = -1;
1787 * Test if the private key was already created.
1788 * XXX: Can this still happen?
1790 if (subject_key_len == 0)
1792 log_error(LOG_LEVEL_ERROR, "Subject key was already created");
1798 * Parse serial to MPI
1800 serial_num = BN_new();
1803 log_error(LOG_LEVEL_ERROR, "generate_webpage_certificate: memory error");
1807 if (!BN_dec2bn(&serial_num, cert_opt.serial))
1809 log_ssl_errors(LOG_LEVEL_ERROR, "Failed to parse serial %s", cert_opt.serial);
1814 if (!(serial = BN_to_ASN1_INTEGER(serial_num, NULL)))
1816 log_ssl_errors(LOG_LEVEL_ERROR, "Failed to generate serial ASN1 representation");
1822 * Loading certificates
1824 if (!(issuer_cert = ssl_certificate_load(cert_opt.issuer_crt)))
1826 log_error(LOG_LEVEL_ERROR, "Loading issuer certificate %s failed",
1827 cert_opt.issuer_crt);
1832 issuer_name = X509_get_issuer_name(issuer_cert);
1835 * Loading keys from file or from buffer
1837 if (key_buf != NULL && subject_key_len > 0)
1839 pk_bio = BIO_new_mem_buf(key_buf, subject_key_len);
1841 else if (!(pk_bio = BIO_new_file(cert_opt.subject_key, "r")))
1843 log_ssl_errors(LOG_LEVEL_ERROR,
1844 "Failure opening subject key %s BIO", cert_opt.subject_key);
1849 loaded_subject_key = PEM_read_bio_PrivateKey(pk_bio, NULL, NULL,
1850 (void *)cert_opt.subject_pwd);
1851 if (!loaded_subject_key)
1853 log_ssl_errors(LOG_LEVEL_ERROR, "Parsing subject key %s failed",
1854 cert_opt.subject_key);
1859 if (!BIO_free(pk_bio))
1861 log_ssl_errors(LOG_LEVEL_ERROR, "Error closing subject key BIO");
1864 if (!(pk_bio = BIO_new_file(cert_opt.issuer_key, "r")))
1866 log_ssl_errors(LOG_LEVEL_ERROR, "Failure opening issuer key %s BIO",
1867 cert_opt.issuer_key);
1872 loaded_issuer_key = PEM_read_bio_PrivateKey(pk_bio, NULL, NULL,
1873 (void *)cert_opt.issuer_pwd);
1874 if (!loaded_issuer_key)
1876 log_ssl_errors(LOG_LEVEL_ERROR, "Parsing issuer key %s failed",
1877 cert_opt.subject_key);
1885 log_ssl_errors(LOG_LEVEL_ERROR, "Certificate allocation error");
1890 if (!X509_set_version(cert, CERTIFICATE_VERSION))
1892 log_ssl_errors(LOG_LEVEL_ERROR, "X509_set_version failed");
1898 * Setting parameters of signed certificate
1900 if (!X509_set_pubkey(cert, loaded_subject_key))
1902 log_ssl_errors(LOG_LEVEL_ERROR,
1903 "Setting issuer name in signed certificate failed");
1908 if (!X509_set_subject_name(cert, subject_name))
1910 log_ssl_errors(LOG_LEVEL_ERROR,
1911 "Setting issuer name in signed certificate failed");
1916 if (!X509_set_issuer_name(cert, issuer_name))
1918 log_ssl_errors(LOG_LEVEL_ERROR,
1919 "Setting issuer name in signed certificate failed");
1924 if (!X509_set_serialNumber(cert, serial))
1926 log_ssl_errors(LOG_LEVEL_ERROR,
1927 "Setting serial number in signed certificate failed");
1932 asn_time = ASN1_TIME_new();
1935 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time memory allocation failure");
1940 if (!ASN1_TIME_set_string(asn_time, cert_opt.not_after))
1942 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time [%s] encode error", cert_opt.not_after);
1947 if (!X509_set1_notAfter(cert, asn_time))
1949 log_ssl_errors(LOG_LEVEL_ERROR,
1950 "Setting valid not after in signed certificate failed");
1955 if (!ASN1_TIME_set_string(asn_time, cert_opt.not_before))
1957 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time encode error");
1962 if (!X509_set1_notBefore(cert, asn_time))
1964 log_ssl_errors(LOG_LEVEL_ERROR,
1965 "Setting valid not befre in signed certificate failed");
1970 if (!set_x509_ext(cert, issuer_cert, NID_basic_constraints, CERTIFICATE_BASIC_CONSTRAINTS))
1972 log_ssl_errors(LOG_LEVEL_ERROR, "Setting the basicConstraints extension "
1973 "in signed certificate failed");
1978 if (!set_x509_ext(cert, issuer_cert, NID_subject_key_identifier, CERTIFICATE_SUBJECT_KEY))
1980 log_ssl_errors(LOG_LEVEL_ERROR,
1981 "Setting the Subject Key Identifie extension failed");
1986 if (!set_x509_ext(cert, issuer_cert, NID_authority_key_identifier, CERTIFICATE_AUTHORITY_KEY))
1988 log_ssl_errors(LOG_LEVEL_ERROR,
1989 "Setting the Authority Key Identifier extension failed");
1994 if (!host_is_ip_address(csp->http->host) &&
1995 !set_subject_alternative_name(cert, issuer_cert, csp->http->host))
1997 log_ssl_errors(LOG_LEVEL_ERROR, "Setting the Subject Alt Nameextension failed");
2002 if (!X509_sign(cert, loaded_issuer_key, EVP_sha256()))
2004 log_ssl_errors(LOG_LEVEL_ERROR, "Signing certificate failed");
2010 * Writing certificate into file
2012 if (write_certificate(cert, cert_opt.output_file) < 0)
2014 log_error(LOG_LEVEL_ERROR, "Writing certificate into file failed");
2023 * Freeing used structures
2027 X509_free(issuer_cert);
2033 if (pk_bio && !BIO_free(pk_bio))
2035 log_ssl_errors(LOG_LEVEL_ERROR, "Error closing pk BIO");
2037 if (loaded_subject_key)
2039 EVP_PKEY_free(loaded_subject_key);
2041 if (loaded_issuer_key)
2043 EVP_PKEY_free(loaded_issuer_key);
2047 X509_NAME_free(subject_name);
2051 ASN1_TIME_free(asn_time);
2055 BN_free(serial_num);
2059 ASN1_INTEGER_free(serial);
2061 freez(cert_opt.subject_key);
2062 freez(cert_opt.output_file);
2069 /*********************************************************************
2071 * Function : ssl_crt_verify_info
2073 * Description : Returns an informational string about the verification
2074 * status of a certificate.
2077 * 1 : buf = Buffer to write to
2078 * 2 : size = Maximum size of buffer
2079 * 3 : csp = client state
2083 *********************************************************************/
2084 extern void ssl_crt_verify_info(char *buf, size_t size, struct client_state *csp)
2086 strncpy(buf, X509_verify_cert_error_string(csp->server_cert_verification_result), size);
2091 /*********************************************************************
2093 * Function : ssl_release
2095 * Description : Release all SSL resources
2101 *********************************************************************/
2102 extern void ssl_release(void)
2104 if (ssl_inited == 1)
2106 SSL_COMP_free_compression_methods();
2108 CONF_modules_free();
2109 CONF_modules_unload(1);
2111 COMP_zlib_cleanup();
2116 CRYPTO_cleanup_all_ex_data();