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 const X509_ALGOR *tsig_alg;
268 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new_mem_buf() failed");
273 * Searching for last item in certificates linked list
275 while (last->next != NULL)
281 * Preparing next item in linked list for next certificate
283 last->next = malloc_or_die(sizeof(struct certs_chain));
284 last->next->next = NULL;
285 memset(last->next->info_buf, 0, sizeof(last->next->info_buf));
286 memset(last->next->file_buf, 0, sizeof(last->next->file_buf));
289 * Saving certificate file into buffer
291 if (!PEM_write_bio_X509(bio, crt))
293 log_ssl_errors(LOG_LEVEL_ERROR, "PEM_write_X509() failed");
298 len = BIO_get_mem_data(bio, &bio_mem_data);
300 if (len > (sizeof(last->file_buf) - 1))
302 log_error(LOG_LEVEL_ERROR,
303 "X509 PEM cert len %d is larger then buffer len %s",
304 len, sizeof(last->file_buf) - 1);
305 len = sizeof(last->file_buf) - 1;
308 strncpy(last->file_buf, bio_mem_data, (size_t)len);
310 bio = BIO_new(BIO_s_mem());
313 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new_mem_buf() failed");
319 * Saving certificate information into buffer
321 l = X509_get_version(crt);
322 if (l >= 0 && l <= 2)
324 if (BIO_printf(bio, "cert. version : %ld\n", l + 1) <= 0)
326 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for version failed");
333 if (BIO_printf(bio, "cert. version : Unknown (%ld)\n", l) <= 0)
335 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for version failed");
341 if (BIO_puts(bio, "serial number : ") <= 0)
343 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_write() for serial failed");
347 bs = X509_get0_serialNumber(crt);
348 if (bs->length <= (int)sizeof(long))
351 l = ASN1_INTEGER_get(bs);
362 if (bs->type == V_ASN1_NEG_INTEGER)
364 ul = 0 - (unsigned long)l;
369 ul = (unsigned long)l;
372 if (BIO_printf(bio, " %s%lu (%s0x%lx)\n", neg, ul, neg, ul) <= 0)
374 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for serial failed");
381 if (bs->type == V_ASN1_NEG_INTEGER)
383 if (BIO_puts(bio, " (Negative)") < 0)
385 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for serial failed");
390 for (int i = 0; i < bs->length; i++)
392 if (BIO_printf(bio, "%02x%c", bs->data[i],
393 ((i + 1 == bs->length) ? '\n' : ':')) <= 0)
395 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for serial failed");
402 if (BIO_puts(bio, "issuer name : ") <= 0)
404 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for issuer failed");
408 if (X509_NAME_print_ex(bio, X509_get_issuer_name(crt), 0, 0) < 0)
410 log_ssl_errors(LOG_LEVEL_ERROR, "X509_NAME_print_ex() for issuer failed");
415 if (BIO_puts(bio, "\nsubject name : ") <= 0)
417 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for sublect failed");
421 if (X509_NAME_print_ex(bio, X509_get_subject_name(crt), 0, 0) < 0) {
422 log_ssl_errors(LOG_LEVEL_ERROR, "X509_NAME_print_ex() for subject failed");
427 if (BIO_puts(bio, "\nissued on : ") <= 0)
429 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for issued on failed");
433 if (!ASN1_TIME_print(bio, X509_get0_notBefore(crt)))
435 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_TIME_print() for issued on failed");
440 if (BIO_puts(bio, "\nexpires on : ") <= 0)
442 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for expires on failed");
446 if (!ASN1_TIME_print(bio, X509_get0_notAfter(crt)))
448 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_TIME_print() for expires on failed");
453 if (BIO_puts(bio, "\nsigned using : ") <= 0)
455 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for signed using failed");
459 tsig_alg = X509_get0_tbs_sigalg(crt);
460 if (!i2a_ASN1_OBJECT(bio, tsig_alg->algorithm))
462 log_ssl_errors(LOG_LEVEL_ERROR, "i2a_ASN1_OBJECT() for signed using on failed");
466 pkey = X509_get_pubkey(crt);
469 log_ssl_errors(LOG_LEVEL_ERROR, "X509_get_pubkey() failed");
474 switch (EVP_PKEY_base_id(pkey))
477 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "RSA key size", EVP_PKEY_bits(pkey));
480 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "DSA key size", EVP_PKEY_bits(pkey));
483 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "non-RSA/DSA key size", EVP_PKEY_bits(pkey));
488 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for key size failed");
493 loc = X509_get_ext_by_NID(crt, NID_basic_constraints, -1);
496 X509_EXTENSION *ex = X509_get_ext(crt, loc);
497 if (BIO_puts(bio, "\nbasic constraints : ") <= 0)
499 log_ssl_errors(LOG_LEVEL_ERROR,
500 "BIO_printf() for basic constraints failed");
504 if (!X509V3_EXT_print(bio, ex, 0, 0))
506 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex), ASN1_STRFLGS_RFC2253))
508 log_ssl_errors(LOG_LEVEL_ERROR,
509 "ASN1_STRING_print_ex() for basic constraints failed");
516 loc = X509_get_ext_by_NID(crt, NID_subject_alt_name, -1);
519 X509_EXTENSION *ex = X509_get_ext(crt, loc);
520 if (BIO_puts(bio, "\nsubject alt name : ") <= 0)
522 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for alt name failed");
526 if (!X509V3_EXT_print(bio, ex, 0, 0))
528 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
529 ASN1_STRFLGS_RFC2253))
531 log_ssl_errors(LOG_LEVEL_ERROR,
532 "ASN1_STRING_print_ex() for alt name failed");
539 loc = X509_get_ext_by_NID(crt, NID_netscape_cert_type, -1);
542 X509_EXTENSION *ex = X509_get_ext(crt, loc);
543 if (BIO_puts(bio, "\ncert. type : ") <= 0)
545 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for cert type failed");
549 if (!X509V3_EXT_print(bio, ex, 0, 0))
551 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
552 ASN1_STRFLGS_RFC2253))
554 log_ssl_errors(LOG_LEVEL_ERROR,
555 "ASN1_STRING_print_ex() for cert type failed");
562 loc = X509_get_ext_by_NID(crt, NID_key_usage, -1);
565 X509_EXTENSION *ex = X509_get_ext(crt, loc);
566 if (BIO_puts(bio, "\nkey usage : ") <= 0)
568 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for key usage failed");
572 if (!X509V3_EXT_print(bio, ex, 0, 0))
574 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
575 ASN1_STRFLGS_RFC2253))
577 log_ssl_errors(LOG_LEVEL_ERROR,
578 "ASN1_STRING_print_ex() for key usage failed");
585 loc = X509_get_ext_by_NID(crt, NID_ext_key_usage, -1);
587 X509_EXTENSION *ex = X509_get_ext(crt, loc);
588 if (BIO_puts(bio, "\next key usage : ") <= 0)
590 log_ssl_errors(LOG_LEVEL_ERROR,
591 "BIO_printf() for ext key usage failed");
595 if (!X509V3_EXT_print(bio, ex, 0, 0))
597 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
598 ASN1_STRFLGS_RFC2253))
600 log_ssl_errors(LOG_LEVEL_ERROR,
601 "ASN1_STRING_print_ex() for ext key usage failed");
608 loc = X509_get_ext_by_NID(crt, NID_certificate_policies, -1);
611 X509_EXTENSION *ex = X509_get_ext(crt, loc);
612 if (BIO_puts(bio, "\ncertificate policies : ") <= 0)
614 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for certificate policies failed");
618 if (!X509V3_EXT_print(bio, ex, 0, 0))
620 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
621 ASN1_STRFLGS_RFC2253))
623 log_ssl_errors(LOG_LEVEL_ERROR,
624 "ASN1_STRING_print_ex() for certificate policies failed");
631 /* make valgrind happy */
632 static const char zero = 0;
633 BIO_write(bio, &zero, 1);
635 len = BIO_get_mem_data(bio, &bio_mem_data);
636 encoded_text = html_encode(bio_mem_data);
637 strlcpy(last->info_buf, encoded_text, sizeof(last->info_buf));
654 /*********************************************************************
656 * Function : host_to_hash
658 * Description : Creates MD5 hash from host name. Host name is loaded
659 * from structure csp and saved again into it.
662 * 1 : csp = Current client state (buffers, headers, etc...)
664 * Returns : 1 => Error while creating hash
665 * 0 => Hash created successfully
667 *********************************************************************/
668 static int host_to_hash(struct client_state *csp)
672 memset(csp->http->hash_of_host, 0, sizeof(csp->http->hash_of_host));
673 MD5((unsigned char *)csp->http->host, strlen(csp->http->host),
674 csp->http->hash_of_host);
676 /* Converting hash into string with hex */
680 if ((ret = sprintf((char *)csp->http->hash_of_host_hex + 2 * i, "%02x",
681 csp->http->hash_of_host[i])) < 0)
683 log_error(LOG_LEVEL_ERROR, "Sprintf return value: %d", ret);
692 /*********************************************************************
694 * Function : create_client_ssl_connection
696 * Description : Creates TLS/SSL secured connection with client
699 * 1 : csp = Current client state (buffers, headers, etc...)
701 * Returns : 0 on success, negative value if connection wasn't created
704 *********************************************************************/
705 extern int create_client_ssl_connection(struct client_state *csp)
707 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
708 /* Paths to certificates file and key file */
709 char *key_file = NULL;
710 char *ca_file = NULL;
711 char *cert_file = NULL;
716 * Initializing OpenSSL structures for TLS/SSL connection
721 * Preparing hash of host for creating certificates
723 ret = host_to_hash(csp);
726 log_error(LOG_LEVEL_ERROR, "Generating hash of host failed: %d", ret);
732 * Preparing paths to certificates files and key file
734 ca_file = csp->config->ca_cert_file;
735 cert_file = make_certs_path(csp->config->certificate_directory,
736 (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
737 key_file = make_certs_path(csp->config->certificate_directory,
738 (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
740 if (cert_file == NULL || key_file == NULL)
747 * Generating certificate for requested host. Mutex to prevent
748 * certificate and key inconsistence must be locked.
750 privoxy_mutex_lock(&certificate_mutex);
752 ret = generate_webpage_certificate(csp);
755 log_error(LOG_LEVEL_ERROR,
756 "Generate_webpage_certificate failed: %d", ret);
757 privoxy_mutex_unlock(&certificate_mutex);
761 privoxy_mutex_unlock(&certificate_mutex);
763 if (!(ssl_attr->openssl_attr.ctx = SSL_CTX_new(SSLv23_server_method())))
765 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create SSL context");
770 /* Set the key and cert */
771 if (SSL_CTX_use_certificate_file(ssl_attr->openssl_attr.ctx,
772 cert_file, SSL_FILETYPE_PEM) != 1)
774 log_ssl_errors(LOG_LEVEL_ERROR,
775 "Loading webpage certificate %s failed", cert_file);
780 if (SSL_CTX_use_PrivateKey_file(ssl_attr->openssl_attr.ctx,
781 key_file, SSL_FILETYPE_PEM) != 1)
783 log_ssl_errors(LOG_LEVEL_ERROR,
784 "Loading webpage certificate private key %s failed", key_file);
789 SSL_CTX_set_options(ssl_attr->openssl_attr.ctx, SSL_OP_NO_SSLv3);
791 if (!(ssl_attr->openssl_attr.bio = BIO_new_ssl(ssl_attr->openssl_attr.ctx, 0)))
793 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create BIO structure");
798 if (BIO_get_ssl(ssl_attr->openssl_attr.bio, &ssl) != 1)
800 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_get_ssl failed");
805 if (!SSL_set_fd(ssl, csp->cfd))
807 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_fd failed");
813 * Handshake with client
815 log_error(LOG_LEVEL_CONNECT,
816 "Performing the TLS/SSL handshake with client. Hash of host: %s",
817 csp->http->hash_of_host_hex);
818 if (BIO_do_handshake(ssl_attr->openssl_attr.bio) != 1)
820 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_do_handshake failed");
825 log_error(LOG_LEVEL_CONNECT, "Client successfully connected over TLS/SSL");
826 csp->ssl_with_client_is_opened = 1;
831 * Freeing allocated paths to files
836 /* Freeing structures if connection wasn't created successfully */
839 free_client_ssl_structures(csp);
845 /*********************************************************************
847 * Function : close_client_ssl_connection
849 * Description : Closes TLS/SSL connection with client. This function
850 * checks if this connection is already created.
853 * 1 : csp = Current client state (buffers, headers, etc...)
857 *********************************************************************/
858 extern void close_client_ssl_connection(struct client_state *csp)
860 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
862 if (csp->ssl_with_client_is_opened == 0)
868 * Notifying the peer that the connection is being closed.
870 BIO_ssl_shutdown(ssl_attr->openssl_attr.bio);
871 free_client_ssl_structures(csp);
872 csp->ssl_with_client_is_opened = 0;
876 /*********************************************************************
878 * Function : free_client_ssl_structures
880 * Description : Frees structures used for SSL communication with
884 * 1 : csp = Current client state (buffers, headers, etc...)
888 *********************************************************************/
889 static void free_client_ssl_structures(struct client_state *csp)
891 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
893 if (ssl_attr->openssl_attr.bio)
895 BIO_free_all(ssl_attr->openssl_attr.bio);
897 if (ssl_attr->openssl_attr.ctx)
899 SSL_CTX_free(ssl_attr->openssl_attr.ctx);
904 /*********************************************************************
906 * Function : close_server_ssl_connection
908 * Description : Closes TLS/SSL connection with server. This function
909 * checks if this connection is already opened.
912 * 1 : csp = Current client state (buffers, headers, etc...)
916 *********************************************************************/
917 extern void close_server_ssl_connection(struct client_state *csp)
919 struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
921 if (csp->ssl_with_server_is_opened == 0)
927 * Notifying the peer that the connection is being closed.
929 BIO_ssl_shutdown(ssl_attr->openssl_attr.bio);
930 free_server_ssl_structures(csp);
931 csp->ssl_with_server_is_opened = 0;
935 /*********************************************************************
937 * Function : create_server_ssl_connection
939 * Description : Creates TLS/SSL secured connection with server.
942 * 1 : csp = Current client state (buffers, headers, etc...)
944 * Returns : 0 on success, negative value if connection wasn't created
947 *********************************************************************/
948 extern int create_server_ssl_connection(struct client_state *csp)
950 openssl_connection_attr *ssl_attrs = &csp->ssl_server_attr.openssl_attr;
952 char *trusted_cas_file = NULL;
953 STACK_OF(X509) *chain;
956 csp->server_cert_verification_result = SSL_CERT_NOT_VERIFIED;
957 csp->server_certs_chain.next = NULL;
959 /* Setting path to file with trusted CAs */
960 trusted_cas_file = csp->config->trusted_cas_file;
962 ssl_attrs->ctx = SSL_CTX_new(SSLv23_method());
965 log_ssl_errors(LOG_LEVEL_ERROR, "SSL context creation failed");
971 * Loading file with trusted CAs
973 if (!SSL_CTX_load_verify_locations(ssl_attrs->ctx, trusted_cas_file, NULL))
975 log_ssl_errors(LOG_LEVEL_ERROR, "Loading trusted CAs file %s failed",
981 SSL_CTX_set_verify(ssl_attrs->ctx, SSL_VERIFY_NONE, NULL);
982 SSL_CTX_set_options(ssl_attrs->ctx, SSL_OP_NO_SSLv3);
984 if (!(ssl_attrs->bio = BIO_new_ssl(ssl_attrs->ctx, 1)))
986 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create BIO structure");
991 if (BIO_get_ssl(ssl_attrs->bio, &ssl) != 1)
993 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_get_ssl failed");
998 if (!SSL_set_fd(ssl, csp->server_connection.sfd))
1000 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_fd failed");
1006 * Set the hostname to check against the received server certificate
1008 if (!SSL_set1_host(ssl, csp->http->host))
1010 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set1_host failed");
1016 if (!SSL_set_tlsext_host_name(ssl, csp->http->host))
1018 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_tlsext_host_name failed");
1024 * Handshake with server
1026 log_error(LOG_LEVEL_CONNECT,
1027 "Performing the TLS/SSL handshake with the server");
1029 if (BIO_do_handshake(ssl_attrs->bio) != 1)
1031 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_do_handshake failed");
1036 chain = SSL_get_peer_cert_chain(ssl);
1039 for (int i = 0; i < sk_X509_num(chain); i++)
1041 if (ssl_store_cert(csp, sk_X509_value(chain, i)) != 0)
1043 log_error(LOG_LEVEL_ERROR, "ssl_store_cert failed");
1050 if (!csp->dont_verify_certificate)
1052 long verify_result = SSL_get_verify_result(ssl);
1053 if (verify_result == X509_V_OK)
1056 csp->server_cert_verification_result = SSL_CERT_VALID;
1060 csp->server_cert_verification_result = verify_result;
1061 log_error(LOG_LEVEL_ERROR, "SSL_get_verify_result failed: %s",
1062 X509_verify_cert_error_string(verify_result));
1068 log_error(LOG_LEVEL_CONNECT, "Server successfully connected over TLS/SSL");
1071 * Server certificate chain is valid, so we can clean
1072 * chain, because we will not send it to client.
1074 free_certificate_chain(csp);
1076 csp->ssl_with_server_is_opened = 1;
1078 /* Freeing structures if connection wasn't created successfully */
1081 free_server_ssl_structures(csp);
1088 /*********************************************************************
1090 * Function : free_server_ssl_structures
1092 * Description : Frees structures used for SSL communication with server
1095 * 1 : csp = Current client state (buffers, headers, etc...)
1099 *********************************************************************/
1100 static void free_server_ssl_structures(struct client_state *csp)
1102 struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
1104 if (ssl_attr->openssl_attr.bio)
1106 BIO_free_all(ssl_attr->openssl_attr.bio);
1108 if (ssl_attr->openssl_attr.ctx)
1110 SSL_CTX_free(ssl_attr->openssl_attr.ctx);
1115 /*********************************************************************
1117 * Function : log_ssl_errors
1119 * Description : Log SSL errors
1122 * 1 : debuglevel = Debug level
1123 * 2 : desc = Error description
1127 *********************************************************************/
1128 static void log_ssl_errors(int debuglevel, const char* fmt, ...)
1130 unsigned long err_code;
1131 char prefix[ERROR_BUF_SIZE];
1133 va_start(args, fmt);
1134 vsnprintf(prefix, sizeof(prefix), fmt, args);
1137 while ((err_code = ERR_get_error()))
1139 char err_buf[ERROR_BUF_SIZE];
1141 ERR_error_string_n(err_code, err_buf, sizeof(err_buf));
1142 log_error(debuglevel, "%s: %s", prefix, err_buf);
1146 * In case if called by mistake and there were
1147 * no SSL errors let's report it to the log.
1151 log_error(debuglevel, "%s: no ssl errors detected", prefix);
1156 /*********************************************************************
1158 * Function : ssl_base64_encode
1160 * Description : Encode a buffer into base64 format.
1163 * 1 : dst = Destination buffer
1164 * 2 : dlen = Destination buffer length
1165 * 3 : olen = Number of bytes written
1166 * 4 : src = Source buffer
1167 * 5 : slen = Amount of data to be encoded
1169 * Returns : 0 on success, error code othervise
1171 *********************************************************************/
1172 extern int ssl_base64_encode(unsigned char *dst, size_t dlen, size_t *olen,
1173 const unsigned char *src, size_t slen)
1175 *olen = 4 * ((slen/3) + ((slen%3) ? 1 : 0)) + 1;
1180 *olen = (size_t)EVP_EncodeBlock(dst, src, (int)slen) + 1;
1185 /*********************************************************************
1187 * Function : close_file_stream
1189 * Description : Close file stream, report error on close error
1192 * 1 : f = file stream to close
1193 * 2 : path = path for error report
1197 *********************************************************************/
1198 static void close_file_stream(FILE *f, const char *path)
1202 log_error(LOG_LEVEL_ERROR,
1203 "Error closing file %s: %s", path, strerror(errno));
1208 /*********************************************************************
1210 * Function : write_certificate
1212 * Description : Writes certificate into file.
1215 * 1 : crt = certificate to write into file
1216 * 2 : output_file = path to save certificate file
1219 * Returns : 1 on success success or negative value
1221 *********************************************************************/
1222 static int write_certificate(X509 *crt, const char *output_file)
1228 * Saving certificate into file
1230 if ((f = fopen(output_file, "w")) == NULL)
1232 log_error(LOG_LEVEL_ERROR, "Opening file %s to save certificate failed",
1237 ret = PEM_write_X509(f, crt);
1240 log_ssl_errors(LOG_LEVEL_ERROR,
1241 "Writing certificate into file %s failed", output_file);
1245 close_file_stream(f, output_file);
1250 /*********************************************************************
1252 * Function : write_private_key
1254 * Description : Writes private key into file and copies saved
1255 * content into given pointer to string. If function
1256 * returns 0 for success, this copy must be freed by
1260 * 1 : key = key to write into file
1261 * 2 : ret_buf = pointer to string with created key file content
1262 * 3 : key_file_path = path where to save key file
1264 * Returns : Length of written private key on success or negative value
1267 *********************************************************************/
1268 static int write_private_key(EVP_PKEY *key, char **ret_buf,
1269 const char *key_file_path)
1271 size_t len = 0; /* Length of created key */
1272 FILE *f = NULL; /* File to save certificate */
1274 BIO *bio_mem = BIO_new(BIO_s_mem());
1275 char *bio_mem_data = 0;
1277 if (bio_mem == NULL)
1279 log_ssl_errors(LOG_LEVEL_ERROR, "write_private_key memory allocation failure");
1284 * Writing private key into PEM string
1286 if (!PEM_write_bio_PrivateKey(bio_mem, key, NULL, NULL, 0, NULL, NULL))
1288 log_ssl_errors(LOG_LEVEL_ERROR,
1289 "Writing private key into PEM string failed");
1294 len = (size_t)BIO_get_mem_data(bio_mem, &bio_mem_data);
1296 /* Initializing buffer for key file content */
1297 *ret_buf = zalloc_or_die(len + 1);
1298 (*ret_buf)[len] = 0;
1300 strncpy(*ret_buf, bio_mem_data, len);
1303 * Saving key into file
1305 if ((f = fopen(key_file_path, "wb")) == NULL)
1307 log_error(LOG_LEVEL_ERROR,
1308 "Opening file %s to save private key failed: %E",
1314 if (fwrite(*ret_buf, 1, len, f) != len)
1316 log_error(LOG_LEVEL_ERROR,
1317 "Writing private key into file %s failed",
1319 close_file_stream(f, key_file_path);
1324 close_file_stream(f, key_file_path);
1338 /*********************************************************************
1340 * Function : generate_key
1342 * Description : Tests if private key for host saved in csp already
1343 * exists. If this file doesn't exists, a new key is
1344 * generated and saved in a file. The generated key is also
1345 * copied into given parameter key_buf, which must be then
1346 * freed by caller. If file with key exists, key_buf
1347 * contain NULL and no private key is generated.
1350 * 1 : csp = Current client state (buffers, headers, etc...)
1351 * 2 : key_buf = buffer to save new generated key
1353 * Returns : -1 => Error while generating private key
1354 * 0 => Key already exists
1355 * >0 => Length of generated private key
1357 *********************************************************************/
1358 static int generate_key(struct client_state *csp, char **key_buf)
1361 char* key_file_path = NULL;
1362 BIGNUM *exp = BN_new();
1363 RSA *rsa = RSA_new();
1364 EVP_PKEY *key = EVP_PKEY_new();
1366 if (exp == NULL || rsa == NULL || key == NULL)
1368 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key memory allocation failure");
1373 BN_set_word(exp, RSA_KEY_PUBLIC_EXPONENT);
1375 key_file_path = make_certs_path(csp->config->certificate_directory,
1376 (char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
1377 if (key_file_path == NULL)
1384 * Test if key already exists. If so, we don't have to create it again.
1386 if (file_exists(key_file_path) == 1)
1392 ret = RSA_generate_key_ex(rsa, RSA_KEYSIZE, exp, NULL);
1395 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key generation failure");
1400 if (!EVP_PKEY_set1_RSA(key, rsa))
1402 log_ssl_errors(LOG_LEVEL_ERROR,
1403 "Error assigning RSA key pair to PKEY structure");
1409 * Exporting private key into file
1411 if ((ret = write_private_key(key, key_buf, key_file_path)) < 0)
1413 log_error(LOG_LEVEL_ERROR,
1414 "Writing private key into file %s failed", key_file_path);
1421 * Freeing used variables
1435 freez(key_file_path);
1441 /*********************************************************************
1443 * Function : ssl_certificate_load
1445 * Description : Loads certificate from file.
1448 * 1 : cert_path = The certificate path to load
1450 * Returns : NULL => error loading certificate,
1451 * pointer to certificate instance otherwise
1453 *********************************************************************/
1454 static X509* ssl_certificate_load(const char *cert_path)
1457 FILE *cert_f = NULL;
1459 if (!(cert_f = fopen(cert_path, "r")))
1461 log_error(LOG_LEVEL_ERROR,
1462 "Error opening certificate file %s: %s", cert_path, strerror(errno));
1466 if (!(cert = PEM_read_X509(cert_f, NULL, NULL, NULL)))
1468 log_ssl_errors(LOG_LEVEL_ERROR,
1469 "Error reading certificate file %s", cert_path);
1472 close_file_stream(cert_f, cert_path);
1477 /*********************************************************************
1479 * Function : ssl_certificate_is_invalid
1481 * Description : Checks whether or not a certificate is valid.
1482 * Currently only checks that the certificate can be
1483 * parsed and that the "valid to" date is in the future.
1486 * 1 : cert_file = The certificate to check
1488 * Returns : 0 => The certificate is valid.
1489 * 1 => The certificate is invalid
1491 *********************************************************************/
1492 static int ssl_certificate_is_invalid(const char *cert_file)
1498 if (!(cert = ssl_certificate_load(cert_file)))
1500 log_ssl_errors(LOG_LEVEL_ERROR,
1501 "Error reading certificate file %s", cert_file);
1505 ret = X509_cmp_current_time(X509_get_notAfter(cert));
1508 log_ssl_errors(LOG_LEVEL_ERROR,
1509 "Error checking certificate %s validity", cert_file);
1514 return ret == -1 ? 1 : 0;
1518 /*********************************************************************
1520 * Function : set_x509_ext
1522 * Description : Sets the X509V3 extension data
1525 * 1 : cert = The certificate to modify
1526 * 2 : issuer = Issuer certificate
1527 * 3 : nid = OpenSSL NID
1528 * 4 : value = extension value
1530 * Returns : 0 => Error while setting extensuon data
1533 *********************************************************************/
1534 static int set_x509_ext(X509 *cert, X509 *issuer, int nid, char *value)
1536 X509_EXTENSION *ext = NULL;
1540 X509V3_set_ctx(&ctx, issuer, cert, NULL, NULL, 0);
1541 ext = X509V3_EXT_conf_nid(NULL, &ctx, nid, value);
1544 log_ssl_errors(LOG_LEVEL_ERROR, "X509V3_EXT_conf_nid failure");
1548 if (!X509_add_ext(cert, ext, -1))
1550 log_ssl_errors(LOG_LEVEL_ERROR, "X509_add_ext failure");
1558 X509_EXTENSION_free(ext);
1564 /*********************************************************************
1566 * Function : set_subject_alternative_name
1568 * Description : Sets the Subject Alternative Name extension to a cert
1571 * 1 : cert = The certificate to modify
1572 * 2 : issuer = Issuer certificate
1573 * 3 : hostname = The hostname to add
1575 * Returns : 0 => Error while creating certificate.
1578 *********************************************************************/
1579 static int set_subject_alternative_name(X509 *cert, X509 *issuer, const char *hostname)
1581 size_t altname_len = strlen(hostname) + sizeof(CERTIFICATE_ALT_NAME_PREFIX);
1582 char alt_name_buf[altname_len];
1584 snprintf(alt_name_buf, sizeof(alt_name_buf),
1585 CERTIFICATE_ALT_NAME_PREFIX"%s", hostname);
1586 return set_x509_ext(cert, issuer, NID_subject_alt_name, alt_name_buf);
1590 /*********************************************************************
1592 * Function : generate_webpage_certificate
1594 * Description : Creates certificate file in presetted directory.
1595 * If certificate already exists, no other certificate
1596 * will be created. Subject of certificate is named
1597 * by csp->http->host from parameter. This function also
1598 * triggers generating of private key for new certificate.
1601 * 1 : csp = Current client state (buffers, headers, etc...)
1603 * Returns : -1 => Error while creating certificate.
1604 * 0 => Certificate already exists.
1605 * 1 => Certificate created
1607 *********************************************************************/
1608 static int generate_webpage_certificate(struct client_state *csp)
1610 char *key_buf = NULL; /* Buffer for created key */
1611 X509 *issuer_cert = NULL;
1614 EVP_PKEY *loaded_subject_key = NULL;
1615 EVP_PKEY *loaded_issuer_key = NULL;
1616 X509_NAME *issuer_name;
1617 X509_NAME *subject_name = NULL;
1618 ASN1_TIME *asn_time = NULL;
1619 ASN1_INTEGER *serial = NULL;
1620 BIGNUM *serial_num = NULL;
1623 cert_options cert_opt;
1624 char cert_valid_from[VALID_DATETIME_BUFLEN];
1625 char cert_valid_to[VALID_DATETIME_BUFLEN];
1627 /* Paths to keys and certificates needed to create certificate */
1628 cert_opt.issuer_key = NULL;
1629 cert_opt.subject_key = NULL;
1630 cert_opt.issuer_crt = NULL;
1632 cert_opt.output_file = make_certs_path(csp->config->certificate_directory,
1633 (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
1634 if (cert_opt.output_file == NULL)
1639 cert_opt.subject_key = make_certs_path(csp->config->certificate_directory,
1640 (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
1641 if (cert_opt.subject_key == NULL)
1643 freez(cert_opt.output_file);
1647 if (file_exists(cert_opt.output_file) == 1)
1649 /* The file exists, but is it valid? */
1650 if (ssl_certificate_is_invalid(cert_opt.output_file))
1652 log_error(LOG_LEVEL_CONNECT,
1653 "Certificate %s is no longer valid. Removing it.",
1654 cert_opt.output_file);
1655 if (unlink(cert_opt.output_file))
1657 log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
1658 cert_opt.output_file);
1660 freez(cert_opt.output_file);
1661 freez(cert_opt.subject_key);
1665 if (unlink(cert_opt.subject_key))
1667 log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
1668 cert_opt.subject_key);
1670 freez(cert_opt.output_file);
1671 freez(cert_opt.subject_key);
1678 freez(cert_opt.output_file);
1679 freez(cert_opt.subject_key);
1686 * Create key for requested host
1688 int subject_key_len = generate_key(csp, &key_buf);
1689 if (subject_key_len < 0)
1691 freez(cert_opt.output_file);
1692 freez(cert_opt.subject_key);
1693 log_error(LOG_LEVEL_ERROR, "Key generating failed");
1698 * Converting unsigned long serial number to char * serial number.
1699 * We must compute length of serial number in string + terminating null.
1701 unsigned long certificate_serial = get_certificate_serial(csp);
1702 unsigned long certificate_serial_time = (unsigned long)time(NULL);
1703 int serial_num_size = snprintf(NULL, 0, "%lu%lu",
1704 certificate_serial_time, certificate_serial) + 1;
1705 if (serial_num_size <= 0)
1707 serial_num_size = 1;
1710 char serial_num_text[serial_num_size]; /* Buffer for serial number */
1711 ret = snprintf(serial_num_text, (size_t)serial_num_size, "%lu%lu",
1712 certificate_serial_time, certificate_serial);
1713 if (ret < 0 || ret >= serial_num_size)
1715 log_error(LOG_LEVEL_ERROR,
1716 "Converting certificate serial number into string failed");
1722 * Preparing parameters for certificate
1724 subject_name = X509_NAME_new();
1727 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key memory allocation failure");
1732 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_COMMON_NAME_FCODE,
1733 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1735 log_ssl_errors(LOG_LEVEL_ERROR,
1736 "X509 subject name (code: %s, val: %s) error",
1737 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1741 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_ORGANIZATION_FCODE,
1742 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1744 log_ssl_errors(LOG_LEVEL_ERROR,
1745 "X509 subject name (code: %s, val: %s) error",
1746 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1750 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_ORG_UNIT_FCODE,
1751 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1753 log_ssl_errors(LOG_LEVEL_ERROR,
1754 "X509 subject name (code: %s, val: %s) error",
1755 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1759 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_COUNTRY_FCODE,
1760 MBSTRING_ASC, (void *)CERT_PARAM_COUNTRY_CODE, -1, -1, 0))
1762 log_ssl_errors(LOG_LEVEL_ERROR,
1763 "X509 subject name (code: %s, val: %s) error",
1764 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1769 cert_opt.issuer_crt = csp->config->ca_cert_file;
1770 cert_opt.issuer_key = csp->config->ca_key_file;
1772 if (get_certificate_valid_from_date(cert_valid_from,
1773 sizeof(cert_valid_from), VALID_DATETIME_FMT)
1774 || get_certificate_valid_to_date(cert_valid_to,
1775 sizeof(cert_valid_to), VALID_DATETIME_FMT))
1777 log_error(LOG_LEVEL_ERROR, "Generating one of the validity dates failed");
1782 cert_opt.subject_pwd = CERT_SUBJECT_PASSWORD;
1783 cert_opt.issuer_pwd = csp->config->ca_password;
1784 cert_opt.not_before = cert_valid_from;
1785 cert_opt.not_after = cert_valid_to;
1786 cert_opt.serial = serial_num_text;
1787 cert_opt.max_pathlen = -1;
1790 * Test if the private key was already created.
1791 * XXX: Can this still happen?
1793 if (subject_key_len == 0)
1795 log_error(LOG_LEVEL_ERROR, "Subject key was already created");
1801 * Parse serial to MPI
1803 serial_num = BN_new();
1806 log_error(LOG_LEVEL_ERROR, "generate_webpage_certificate: memory error");
1810 if (!BN_dec2bn(&serial_num, cert_opt.serial))
1812 log_ssl_errors(LOG_LEVEL_ERROR, "Failed to parse serial %s", cert_opt.serial);
1817 if (!(serial = BN_to_ASN1_INTEGER(serial_num, NULL)))
1819 log_ssl_errors(LOG_LEVEL_ERROR, "Failed to generate serial ASN1 representation");
1825 * Loading certificates
1827 if (!(issuer_cert = ssl_certificate_load(cert_opt.issuer_crt)))
1829 log_error(LOG_LEVEL_ERROR, "Loading issuer certificate %s failed",
1830 cert_opt.issuer_crt);
1835 issuer_name = X509_get_issuer_name(issuer_cert);
1838 * Loading keys from file or from buffer
1840 if (key_buf != NULL && subject_key_len > 0)
1842 pk_bio = BIO_new_mem_buf(key_buf, subject_key_len);
1844 else if (!(pk_bio = BIO_new_file(cert_opt.subject_key, "r")))
1846 log_ssl_errors(LOG_LEVEL_ERROR,
1847 "Failure opening subject key %s BIO", cert_opt.subject_key);
1852 loaded_subject_key = PEM_read_bio_PrivateKey(pk_bio, NULL, NULL,
1853 (void *)cert_opt.subject_pwd);
1854 if (!loaded_subject_key)
1856 log_ssl_errors(LOG_LEVEL_ERROR, "Parsing subject key %s failed",
1857 cert_opt.subject_key);
1862 if (!BIO_free(pk_bio))
1864 log_ssl_errors(LOG_LEVEL_ERROR, "Error closing subject key BIO");
1867 if (!(pk_bio = BIO_new_file(cert_opt.issuer_key, "r")))
1869 log_ssl_errors(LOG_LEVEL_ERROR, "Failure opening issuer key %s BIO",
1870 cert_opt.issuer_key);
1875 loaded_issuer_key = PEM_read_bio_PrivateKey(pk_bio, NULL, NULL,
1876 (void *)cert_opt.issuer_pwd);
1877 if (!loaded_issuer_key)
1879 log_ssl_errors(LOG_LEVEL_ERROR, "Parsing issuer key %s failed",
1880 cert_opt.subject_key);
1888 log_ssl_errors(LOG_LEVEL_ERROR, "Certificate allocation error");
1893 if (!X509_set_version(cert, CERTIFICATE_VERSION))
1895 log_ssl_errors(LOG_LEVEL_ERROR, "X509_set_version failed");
1901 * Setting parameters of signed certificate
1903 if (!X509_set_pubkey(cert, loaded_subject_key))
1905 log_ssl_errors(LOG_LEVEL_ERROR,
1906 "Setting issuer name in signed certificate failed");
1911 if (!X509_set_subject_name(cert, subject_name))
1913 log_ssl_errors(LOG_LEVEL_ERROR,
1914 "Setting issuer name in signed certificate failed");
1919 if (!X509_set_issuer_name(cert, issuer_name))
1921 log_ssl_errors(LOG_LEVEL_ERROR,
1922 "Setting issuer name in signed certificate failed");
1927 if (!X509_set_serialNumber(cert, serial))
1929 log_ssl_errors(LOG_LEVEL_ERROR,
1930 "Setting serial number in signed certificate failed");
1935 asn_time = ASN1_TIME_new();
1938 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time memory allocation failure");
1943 if (!ASN1_TIME_set_string(asn_time, cert_opt.not_after))
1945 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time [%s] encode error", cert_opt.not_after);
1950 if (!X509_set1_notAfter(cert, asn_time))
1952 log_ssl_errors(LOG_LEVEL_ERROR,
1953 "Setting valid not after in signed certificate failed");
1958 if (!ASN1_TIME_set_string(asn_time, cert_opt.not_before))
1960 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time encode error");
1965 if (!X509_set1_notBefore(cert, asn_time))
1967 log_ssl_errors(LOG_LEVEL_ERROR,
1968 "Setting valid not befre in signed certificate failed");
1973 if (!set_x509_ext(cert, issuer_cert, NID_basic_constraints, CERTIFICATE_BASIC_CONSTRAINTS))
1975 log_ssl_errors(LOG_LEVEL_ERROR, "Setting the basicConstraints extension "
1976 "in signed certificate failed");
1981 if (!set_x509_ext(cert, issuer_cert, NID_subject_key_identifier, CERTIFICATE_SUBJECT_KEY))
1983 log_ssl_errors(LOG_LEVEL_ERROR,
1984 "Setting the Subject Key Identifie extension failed");
1989 if (!set_x509_ext(cert, issuer_cert, NID_authority_key_identifier, CERTIFICATE_AUTHORITY_KEY))
1991 log_ssl_errors(LOG_LEVEL_ERROR,
1992 "Setting the Authority Key Identifier extension failed");
1997 if (!host_is_ip_address(csp->http->host) &&
1998 !set_subject_alternative_name(cert, issuer_cert, csp->http->host))
2000 log_ssl_errors(LOG_LEVEL_ERROR, "Setting the Subject Alt Nameextension failed");
2005 if (!X509_sign(cert, loaded_issuer_key, EVP_sha256()))
2007 log_ssl_errors(LOG_LEVEL_ERROR, "Signing certificate failed");
2013 * Writing certificate into file
2015 if (write_certificate(cert, cert_opt.output_file) < 0)
2017 log_error(LOG_LEVEL_ERROR, "Writing certificate into file failed");
2026 * Freeing used structures
2030 X509_free(issuer_cert);
2036 if (pk_bio && !BIO_free(pk_bio))
2038 log_ssl_errors(LOG_LEVEL_ERROR, "Error closing pk BIO");
2040 if (loaded_subject_key)
2042 EVP_PKEY_free(loaded_subject_key);
2044 if (loaded_issuer_key)
2046 EVP_PKEY_free(loaded_issuer_key);
2050 X509_NAME_free(subject_name);
2054 ASN1_TIME_free(asn_time);
2058 BN_free(serial_num);
2062 ASN1_INTEGER_free(serial);
2064 freez(cert_opt.subject_key);
2065 freez(cert_opt.output_file);
2072 /*********************************************************************
2074 * Function : ssl_crt_verify_info
2076 * Description : Returns an informational string about the verification
2077 * status of a certificate.
2080 * 1 : buf = Buffer to write to
2081 * 2 : size = Maximum size of buffer
2082 * 3 : csp = client state
2086 *********************************************************************/
2087 extern void ssl_crt_verify_info(char *buf, size_t size, struct client_state *csp)
2089 strncpy(buf, X509_verify_cert_error_string(csp->server_cert_verification_result), size);
2094 /*********************************************************************
2096 * Function : ssl_release
2098 * Description : Release all SSL resources
2104 *********************************************************************/
2105 extern void ssl_release(void)
2107 if (ssl_inited == 1)
2109 SSL_COMP_free_compression_methods();
2111 CONF_modules_free();
2112 CONF_modules_unload(1);
2114 COMP_zlib_cleanup();
2119 CRYPTO_cleanup_all_ex_data();