1 /*********************************************************************
3 * File : $Source: /cvsroot/ijbswa/current/openssl.c,v $
5 * Purpose : File with TLS/SSL extension. Contains methods for
6 * creating, using and closing TLS/SSL connections
7 * using OpenSSL (or LibreSSL).
9 * Copyright : Written by and Copyright (c) 2020 Maxim Antonov <mantonov@gmail.com>
10 * Copyright (C) 2017 Vaclav Svec. FIT CVUT.
11 * Copyright (C) 2018-2022 by Fabian Keil <fk@fabiankeil.de>
13 * This program is free software; you can redistribute it
14 * and/or modify it under the terms of the GNU General
15 * Public License as published by the Free Software
16 * Foundation; either version 2 of the License, or (at
17 * your option) any later version.
19 * This program is distributed in the hope that it will
20 * be useful, but WITHOUT ANY WARRANTY; without even the
21 * implied warranty of MERCHANTABILITY or FITNESS FOR A
22 * PARTICULAR PURPOSE. See the GNU General Public
23 * License for more details.
25 * The GNU General Public License should be included with
26 * this file. If not, you can view it at
27 * http://www.gnu.org/copyleft/gpl.html
28 * or write to the Free Software Foundation, Inc., 59
29 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
31 *********************************************************************/
36 #include <openssl/bn.h>
37 #include <openssl/opensslv.h>
38 #include <openssl/pem.h>
39 #include <openssl/sha.h>
40 #include <openssl/x509v3.h>
42 /* https://www.openssl.org/docs/faq.html
43 I’ve compiled a program under Windows and it crashes: Why?
44 tl,dr: because it needs this include:
46 #include <openssl/applink.c>
56 #include "ssl_common.h"
59 * Macros for openssl.c
61 #define CERTIFICATE_BASIC_CONSTRAINTS "CA:FALSE"
62 #define CERTIFICATE_SUBJECT_KEY "hash"
63 #define CERTIFICATE_AUTHORITY_KEY "keyid:always"
64 #define CERTIFICATE_ALT_NAME_PREFIX "DNS:"
65 #define CERTIFICATE_VERSION 2
66 #define VALID_DATETIME_FMT "%y%m%d%H%M%SZ"
67 #define VALID_DATETIME_BUFLEN 16
69 static int generate_host_certificate(struct client_state *csp);
70 static void free_client_ssl_structures(struct client_state *csp);
71 static void free_server_ssl_structures(struct client_state *csp);
72 static int ssl_store_cert(struct client_state *csp, X509 *crt);
73 static void log_ssl_errors(int debuglevel, const char* fmt, ...) __attribute__((format(printf, 2, 3)));
75 static int ssl_inited = 0;
77 #if OPENSSL_VERSION_NUMBER < 0x10100000L
78 #define X509_set1_notBefore X509_set_notBefore
79 #define X509_set1_notAfter X509_set_notAfter
80 #define X509_get0_serialNumber X509_get_serialNumber
81 #define X509_get0_notBefore X509_get_notBefore
82 #define X509_get0_notAfter X509_get_notAfter
85 /*********************************************************************
87 * Function : openssl_init
89 * Description : Initializes OpenSSL library once
95 *********************************************************************/
96 static void openssl_init(void)
100 privoxy_mutex_lock(&ssl_init_mutex);
103 #if OPENSSL_VERSION_NUMBER < 0x10100000L
106 OPENSSL_init_ssl(0, NULL);
108 SSL_load_error_strings();
109 OpenSSL_add_ssl_algorithms();
112 privoxy_mutex_unlock(&ssl_init_mutex);
117 /*********************************************************************
119 * Function : is_ssl_pending
121 * Description : Tests if there are some waiting data on ssl connection.
122 * Only considers data that has actually been received
123 * locally and ignores data that is still on the fly
124 * or has not yet been sent by the remote end.
127 * 1 : ssl_attr = SSL context to test
129 * Returns : 0 => No data are pending
130 * >0 => Pending data length
132 *********************************************************************/
133 extern size_t is_ssl_pending(struct ssl_attr *ssl_attr)
135 BIO *bio = ssl_attr->openssl_attr.bio;
141 return (size_t)BIO_pending(bio);
145 /*********************************************************************
147 * Function : ssl_send_data
149 * Description : Sends the content of buf (for n bytes) to given SSL
150 * connection context.
153 * 1 : ssl_attr = SSL context to send data to
154 * 2 : buf = Pointer to data to be sent
155 * 3 : len = Length of data to be sent to the SSL context
157 * Returns : Length of sent data or negative value on error.
159 *********************************************************************/
160 extern int ssl_send_data(struct ssl_attr *ssl_attr, const unsigned char *buf, size_t len)
162 BIO *bio = ssl_attr->openssl_attr.bio;
165 int pos = 0; /* Position of unsent part in buffer */
173 if (BIO_get_ssl(bio, &ssl) == 1)
175 fd = SSL_get_fd(ssl);
180 int send_len = (int)len - pos;
182 log_error(LOG_LEVEL_WRITING, "TLS on socket %d: %N",
183 fd, send_len, buf+pos);
186 * Sending one part of the buffer
188 while ((ret = BIO_write(bio,
189 (const unsigned char *)(buf + pos),
192 if (!BIO_should_retry(bio))
194 log_ssl_errors(LOG_LEVEL_ERROR,
195 "Sending data on socket %d over TLS/SSL failed", fd);
199 /* Adding count of sent bytes to position in buffer */
207 /*********************************************************************
209 * Function : ssl_recv_data
211 * Description : Receives data from given SSL context and puts
215 * 1 : ssl_attr = SSL context to receive data from
216 * 2 : buf = Pointer to buffer where data will be written
217 * 3 : max_length = Maximum number of bytes to read
219 * Returns : Number of bytes read, 0 for EOF, or -1
222 *********************************************************************/
223 extern int ssl_recv_data(struct ssl_attr *ssl_attr, unsigned char *buf, size_t max_length)
225 BIO *bio = ssl_attr->openssl_attr.bio;
230 memset(buf, 0, max_length);
233 * Receiving data from SSL context into buffer
237 ret = BIO_read(bio, buf, (int)max_length);
238 } while (ret <= 0 && BIO_should_retry(bio));
240 if (BIO_get_ssl(bio, &ssl) == 1)
242 fd = SSL_get_fd(ssl);
247 log_ssl_errors(LOG_LEVEL_ERROR,
248 "Receiving data on socket %d over TLS/SSL failed", fd);
253 log_error(LOG_LEVEL_RECEIVED, "TLS from socket %d: %N",
260 /*********************************************************************
262 * Function : ssl_store_cert
264 * Description : This function is called once for each certificate in the
265 * server's certificate trusted chain and prepares
266 * information about the certificate. The information can
267 * be used to inform the user about invalid certificates.
270 * 1 : csp = Current client state (buffers, headers, etc...)
271 * 2 : crt = certificate from trusted chain
273 * Returns : 0 on success and negative value on error
275 *********************************************************************/
276 static int ssl_store_cert(struct client_state *csp, X509 *crt)
279 struct certs_chain *last = &(csp->server_certs_chain);
281 BIO *bio = BIO_new(BIO_s_mem());
282 EVP_PKEY *pkey = NULL;
283 char *bio_mem_data = NULL;
286 const ASN1_INTEGER *bs;
287 #if OPENSSL_VERSION_NUMBER > 0x10100000L
288 const X509_ALGOR *tsig_alg;
294 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new() failed");
299 * Searching for last item in certificates linked list
301 while (last->next != NULL)
307 * Preparing next item in linked list for next certificate
309 last->next = malloc_or_die(sizeof(struct certs_chain));
310 last->next->next = NULL;
311 memset(last->next->info_buf, 0, sizeof(last->next->info_buf));
312 last->next->file_buf = NULL;
315 * Saving certificate file into buffer
317 if (!PEM_write_bio_X509(bio, crt))
319 log_ssl_errors(LOG_LEVEL_ERROR, "PEM_write_bio_X509() failed");
324 len = BIO_get_mem_data(bio, &bio_mem_data);
326 last->file_buf = malloc((size_t)len + 1);
327 if (last->file_buf == NULL)
329 log_error(LOG_LEVEL_ERROR,
330 "Failed to allocate %lu bytes to store the X509 PEM certificate",
336 strncpy(last->file_buf, bio_mem_data, (size_t)len);
337 last->file_buf[len] = '\0';
339 bio = BIO_new(BIO_s_mem());
342 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new() failed");
348 * Saving certificate information into buffer
350 l = X509_get_version(crt);
351 if (l >= 0 && l <= 2)
353 if (BIO_printf(bio, "cert. version : %ld\n", l + 1) <= 0)
355 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for version failed");
362 if (BIO_printf(bio, "cert. version : Unknown (%ld)\n", l) <= 0)
364 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for version failed");
370 if (BIO_puts(bio, "serial number : ") <= 0)
372 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for serial failed");
376 bs = X509_get0_serialNumber(crt);
377 if (bs->length <= (int)sizeof(long))
380 l = ASN1_INTEGER_get(bs);
391 if (bs->type == V_ASN1_NEG_INTEGER)
393 ul = 0 - (unsigned long)l;
398 ul = (unsigned long)l;
401 if (BIO_printf(bio, "%s%lu (%s0x%lx)\n", neg, ul, neg, ul) <= 0)
403 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for serial failed");
411 if (bs->type == V_ASN1_NEG_INTEGER)
413 if (BIO_puts(bio, " (Negative)") < 0)
415 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for serial failed");
420 for (i = 0; i < bs->length; i++)
422 if (BIO_printf(bio, "%02x%c", bs->data[i],
423 ((i + 1 == bs->length) ? '\n' : ':')) <= 0)
425 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for serial failed");
432 if (BIO_puts(bio, "issuer name : ") <= 0)
434 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for issuer failed");
438 if (X509_NAME_print_ex(bio, X509_get_issuer_name(crt), 0, 0) < 0)
440 log_ssl_errors(LOG_LEVEL_ERROR, "X509_NAME_print_ex() for issuer failed");
445 if (BIO_puts(bio, "\nsubject name : ") <= 0)
447 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for subject failed");
451 if (X509_NAME_print_ex(bio, X509_get_subject_name(crt), 0, 0) < 0) {
452 log_ssl_errors(LOG_LEVEL_ERROR, "X509_NAME_print_ex() for subject failed");
457 if (BIO_puts(bio, "\nissued on : ") <= 0)
459 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for issued on failed");
463 if (!ASN1_TIME_print(bio, X509_get0_notBefore(crt)))
465 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_TIME_print() for issued on failed");
470 if (BIO_puts(bio, "\nexpires on : ") <= 0)
472 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for expires on failed");
476 if (!ASN1_TIME_print(bio, X509_get0_notAfter(crt)))
478 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_TIME_print() for expires on failed");
483 #if OPENSSL_VERSION_NUMBER > 0x10100000L
484 if (BIO_puts(bio, "\nsigned using : ") <= 0)
486 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for signed using failed");
490 tsig_alg = X509_get0_tbs_sigalg(crt);
491 if (!i2a_ASN1_OBJECT(bio, tsig_alg->algorithm))
493 log_ssl_errors(LOG_LEVEL_ERROR, "i2a_ASN1_OBJECT() for signed using failed");
498 pkey = X509_get_pubkey(crt);
501 log_ssl_errors(LOG_LEVEL_ERROR, "X509_get_pubkey() failed");
506 switch (EVP_PKEY_base_id(pkey))
509 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "RSA key size", EVP_PKEY_bits(pkey));
512 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "DSA key size", EVP_PKEY_bits(pkey));
515 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "EC key size", EVP_PKEY_bits(pkey));
518 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "non-RSA/DSA/EC key size",
519 EVP_PKEY_bits(pkey));
524 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for key size failed");
529 loc = X509_get_ext_by_NID(crt, NID_basic_constraints, -1);
532 X509_EXTENSION *ex = X509_get_ext(crt, loc);
533 if (BIO_puts(bio, "\nbasic constraints : ") <= 0)
535 log_ssl_errors(LOG_LEVEL_ERROR,
536 "BIO_printf() for basic constraints failed");
540 if (!X509V3_EXT_print(bio, ex, 0, 0))
542 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex), ASN1_STRFLGS_RFC2253))
544 log_ssl_errors(LOG_LEVEL_ERROR,
545 "ASN1_STRING_print_ex() for basic constraints failed");
552 loc = X509_get_ext_by_NID(crt, NID_subject_alt_name, -1);
555 X509_EXTENSION *ex = X509_get_ext(crt, loc);
556 if (BIO_puts(bio, "\nsubject alt name : ") <= 0)
558 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for alt name failed");
562 if (!X509V3_EXT_print(bio, ex, 0, 0))
564 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
565 ASN1_STRFLGS_RFC2253))
567 log_ssl_errors(LOG_LEVEL_ERROR,
568 "ASN1_STRING_print_ex() for alt name failed");
575 loc = X509_get_ext_by_NID(crt, NID_netscape_cert_type, -1);
578 X509_EXTENSION *ex = X509_get_ext(crt, loc);
579 if (BIO_puts(bio, "\ncert. type : ") <= 0)
581 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for cert type failed");
585 if (!X509V3_EXT_print(bio, ex, 0, 0))
587 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
588 ASN1_STRFLGS_RFC2253))
590 log_ssl_errors(LOG_LEVEL_ERROR,
591 "ASN1_STRING_print_ex() for cert type failed");
598 loc = X509_get_ext_by_NID(crt, NID_key_usage, -1);
601 X509_EXTENSION *ex = X509_get_ext(crt, loc);
602 if (BIO_puts(bio, "\nkey usage : ") <= 0)
604 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for key usage failed");
608 if (!X509V3_EXT_print(bio, ex, 0, 0))
610 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
611 ASN1_STRFLGS_RFC2253))
613 log_ssl_errors(LOG_LEVEL_ERROR,
614 "ASN1_STRING_print_ex() for key usage failed");
621 loc = X509_get_ext_by_NID(crt, NID_ext_key_usage, -1);
623 X509_EXTENSION *ex = X509_get_ext(crt, loc);
624 if (BIO_puts(bio, "\next key usage : ") <= 0)
626 log_ssl_errors(LOG_LEVEL_ERROR,
627 "BIO_printf() for ext key usage failed");
631 if (!X509V3_EXT_print(bio, ex, 0, 0))
633 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
634 ASN1_STRFLGS_RFC2253))
636 log_ssl_errors(LOG_LEVEL_ERROR,
637 "ASN1_STRING_print_ex() for ext key usage failed");
644 loc = X509_get_ext_by_NID(crt, NID_certificate_policies, -1);
647 X509_EXTENSION *ex = X509_get_ext(crt, loc);
648 if (BIO_puts(bio, "\ncertificate policies : ") <= 0)
650 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for certificate policies failed");
654 if (!X509V3_EXT_print(bio, ex, 0, 0))
656 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
657 ASN1_STRFLGS_RFC2253))
659 log_ssl_errors(LOG_LEVEL_ERROR,
660 "ASN1_STRING_print_ex() for certificate policies failed");
667 /* make valgrind happy */
668 static const char zero = 0;
669 BIO_write(bio, &zero, 1);
671 len = BIO_get_mem_data(bio, &bio_mem_data);
674 log_error(LOG_LEVEL_ERROR, "BIO_get_mem_data() returned %ld "
675 "while gathering certificate information", len);
679 encoded_text = html_encode(bio_mem_data);
680 if (encoded_text == NULL)
682 log_error(LOG_LEVEL_ERROR,
683 "Failed to HTML-encode the certificate information");
688 strlcpy(last->info_buf, encoded_text, sizeof(last->info_buf));
705 /*********************************************************************
707 * Function : host_to_hash
709 * Description : Creates a sha256 hash from host name. The host name
710 * is taken from the csp structure and stored into it.
713 * 1 : csp = Current client state (buffers, headers, etc...)
715 * Returns : -1 => Error while creating hash
716 * 0 => Hash created successfully
718 *********************************************************************/
719 static int host_to_hash(struct client_state *csp)
721 SHA256((unsigned char *)csp->http->host, strlen(csp->http->host),
722 csp->http->hash_of_host);
724 return create_hexadecimal_hash_of_host(csp);
729 /*********************************************************************
731 * Function : create_client_ssl_connection
733 * Description : Creates TLS/SSL secured connection with client
736 * 1 : csp = Current client state (buffers, headers, etc...)
738 * Returns : 0 on success, negative value if connection wasn't created
741 *********************************************************************/
742 extern int create_client_ssl_connection(struct client_state *csp)
744 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
745 /* Paths to certificates file and key file */
746 char *key_file = NULL;
747 char *cert_file = NULL;
752 * Initializing OpenSSL structures for TLS/SSL connection
757 * Preparing hash of host for creating certificates
759 ret = host_to_hash(csp);
762 log_error(LOG_LEVEL_ERROR, "Generating hash of host failed: %d", ret);
768 * Preparing paths to certificates files and key file
770 cert_file = make_certs_path(csp->config->certificate_directory,
771 (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
772 key_file = make_certs_path(csp->config->certificate_directory,
773 (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
775 if (cert_file == NULL || key_file == NULL)
782 * Generating certificate for requested host. Mutex to prevent
783 * certificate and key inconsistence must be locked.
785 privoxy_mutex_lock(&certificate_mutex);
786 ret = generate_host_certificate(csp);
787 privoxy_mutex_unlock(&certificate_mutex);
791 log_error(LOG_LEVEL_ERROR,
792 "generate_host_certificate() failed: %d", ret);
797 if (!(ssl_attr->openssl_attr.ctx = SSL_CTX_new(SSLv23_server_method())))
799 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create SSL context");
804 /* Set the key and cert */
805 if (SSL_CTX_use_certificate_file(ssl_attr->openssl_attr.ctx,
806 cert_file, SSL_FILETYPE_PEM) != 1)
808 log_ssl_errors(LOG_LEVEL_ERROR,
809 "Loading webpage certificate %s failed", cert_file);
814 if (SSL_CTX_use_PrivateKey_file(ssl_attr->openssl_attr.ctx,
815 key_file, SSL_FILETYPE_PEM) != 1)
817 log_ssl_errors(LOG_LEVEL_ERROR,
818 "Loading webpage certificate private key %s failed", key_file);
823 SSL_CTX_set_options(ssl_attr->openssl_attr.ctx, SSL_OP_NO_SSLv3);
825 if (!(ssl_attr->openssl_attr.bio = BIO_new_ssl(ssl_attr->openssl_attr.ctx, 0)))
827 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create BIO structure");
832 if (BIO_get_ssl(ssl_attr->openssl_attr.bio, &ssl) != 1)
834 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_get_ssl failed");
839 if (!SSL_set_fd(ssl, csp->cfd))
841 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_fd failed");
846 if (csp->config->cipher_list != NULL)
848 if (!SSL_set_cipher_list(ssl, csp->config->cipher_list))
850 log_ssl_errors(LOG_LEVEL_ERROR,
851 "Setting the cipher list '%s' for the client connection failed",
852 csp->config->cipher_list);
859 * Handshake with client
861 log_error(LOG_LEVEL_CONNECT,
862 "Performing the TLS/SSL handshake with client. Hash of host: %s",
863 csp->http->hash_of_host_hex);
864 if (BIO_do_handshake(ssl_attr->openssl_attr.bio) != 1)
866 log_ssl_errors(LOG_LEVEL_ERROR,
867 "The TLS/SSL handshake with the client failed");
872 log_error(LOG_LEVEL_CONNECT, "Client successfully connected over %s (%s).",
873 SSL_get_version(ssl), SSL_get_cipher_name(ssl));
875 csp->ssl_with_client_is_opened = 1;
880 * Freeing allocated paths to files
885 /* Freeing structures if connection wasn't created successfully */
888 free_client_ssl_structures(csp);
894 /*********************************************************************
896 * Function : close_client_ssl_connection
898 * Description : Closes TLS/SSL connection with client. This function
899 * checks if this connection is already created.
902 * 1 : csp = Current client state (buffers, headers, etc...)
906 *********************************************************************/
907 extern void close_client_ssl_connection(struct client_state *csp)
909 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
912 if (csp->ssl_with_client_is_opened == 0)
918 * Notifying the peer that the connection is being closed.
920 BIO_ssl_shutdown(ssl_attr->openssl_attr.bio);
921 if (BIO_get_ssl(ssl_attr->openssl_attr.bio, &ssl) != 1)
923 log_ssl_errors(LOG_LEVEL_ERROR,
924 "BIO_get_ssl() failed in close_client_ssl_connection()");
929 * Pretend we received a shutdown alert so
930 * the BIO_free_all() call later on returns
933 SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);
935 free_client_ssl_structures(csp);
936 csp->ssl_with_client_is_opened = 0;
940 /*********************************************************************
942 * Function : free_client_ssl_structures
944 * Description : Frees structures used for SSL communication with
948 * 1 : csp = Current client state (buffers, headers, etc...)
952 *********************************************************************/
953 static void free_client_ssl_structures(struct client_state *csp)
955 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
957 if (ssl_attr->openssl_attr.bio)
959 BIO_free_all(ssl_attr->openssl_attr.bio);
961 if (ssl_attr->openssl_attr.ctx)
963 SSL_CTX_free(ssl_attr->openssl_attr.ctx);
968 /*********************************************************************
970 * Function : close_server_ssl_connection
972 * Description : Closes TLS/SSL connection with server. This function
973 * checks if this connection is already opened.
976 * 1 : csp = Current client state (buffers, headers, etc...)
980 *********************************************************************/
981 extern void close_server_ssl_connection(struct client_state *csp)
983 struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
986 if (csp->ssl_with_server_is_opened == 0)
992 * Notifying the peer that the connection is being closed.
994 BIO_ssl_shutdown(ssl_attr->openssl_attr.bio);
995 if (BIO_get_ssl(ssl_attr->openssl_attr.bio, &ssl) != 1)
997 log_ssl_errors(LOG_LEVEL_ERROR,
998 "BIO_get_ssl() failed in close_server_ssl_connection()");
1003 * Pretend we received a shutdown alert so
1004 * the BIO_free_all() call later on returns
1007 SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);
1009 free_server_ssl_structures(csp);
1010 csp->ssl_with_server_is_opened = 0;
1014 /*********************************************************************
1016 * Function : create_server_ssl_connection
1018 * Description : Creates TLS/SSL secured connection with server.
1021 * 1 : csp = Current client state (buffers, headers, etc...)
1023 * Returns : 0 on success, negative value if connection wasn't created
1026 *********************************************************************/
1027 extern int create_server_ssl_connection(struct client_state *csp)
1029 openssl_connection_attr *ssl_attrs = &csp->ssl_server_attr.openssl_attr;
1031 char *trusted_cas_file = NULL;
1032 STACK_OF(X509) *chain;
1035 csp->server_cert_verification_result = SSL_CERT_NOT_VERIFIED;
1036 csp->server_certs_chain.next = NULL;
1038 /* Setting path to file with trusted CAs */
1039 trusted_cas_file = csp->config->trusted_cas_file;
1041 ssl_attrs->ctx = SSL_CTX_new(SSLv23_method());
1042 if (!ssl_attrs->ctx)
1044 log_ssl_errors(LOG_LEVEL_ERROR, "SSL context creation failed");
1050 * Loading file with trusted CAs
1052 if (!SSL_CTX_load_verify_locations(ssl_attrs->ctx, trusted_cas_file, NULL))
1054 log_ssl_errors(LOG_LEVEL_ERROR, "Loading trusted CAs file %s failed",
1060 SSL_CTX_set_verify(ssl_attrs->ctx, SSL_VERIFY_NONE, NULL);
1061 SSL_CTX_set_options(ssl_attrs->ctx, SSL_OP_NO_SSLv3);
1063 if (!(ssl_attrs->bio = BIO_new_ssl(ssl_attrs->ctx, 1)))
1065 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create BIO structure");
1070 if (BIO_get_ssl(ssl_attrs->bio, &ssl) != 1)
1072 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_get_ssl failed");
1077 if (!SSL_set_fd(ssl, csp->server_connection.sfd))
1079 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_fd failed");
1084 if (csp->config->cipher_list != NULL)
1086 if (!SSL_set_cipher_list(ssl, csp->config->cipher_list))
1088 log_ssl_errors(LOG_LEVEL_ERROR,
1089 "Setting the cipher list '%s' for the server connection failed",
1090 csp->config->cipher_list);
1097 * Set the hostname to check against the received server certificate
1099 #if OPENSSL_VERSION_NUMBER > 0x10100000L
1100 if (!SSL_set1_host(ssl, csp->http->host))
1102 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set1_host failed");
1107 if (host_is_ip_address(csp->http->host))
1109 if (X509_VERIFY_PARAM_set1_ip_asc(ssl->param, csp->http->host) != 1)
1111 log_ssl_errors(LOG_LEVEL_ERROR,
1112 "X509_VERIFY_PARAM_set1_ip_asc() failed");
1119 if (X509_VERIFY_PARAM_set1_host(ssl->param, csp->http->host, 0) != 1)
1121 log_ssl_errors(LOG_LEVEL_ERROR,
1122 "X509_VERIFY_PARAM_set1_host() failed");
1129 if (!SSL_set_tlsext_host_name(ssl, csp->http->host))
1131 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_tlsext_host_name failed");
1137 * Handshake with server
1139 log_error(LOG_LEVEL_CONNECT,
1140 "Performing the TLS/SSL handshake with the server");
1142 if (BIO_do_handshake(ssl_attrs->bio) != 1)
1144 log_ssl_errors(LOG_LEVEL_ERROR,
1145 "The TLS/SSL handshake with the server failed");
1151 * XXX: Do we really have to do this always?
1152 * Probably it's sufficient to do if the verification fails
1153 * in which case we're sending the certificates to the client.
1155 chain = SSL_get_peer_cert_chain(ssl);
1159 for (i = 0; i < sk_X509_num(chain); i++)
1161 if (ssl_store_cert(csp, sk_X509_value(chain, i)) != 0)
1163 log_error(LOG_LEVEL_ERROR, "ssl_store_cert failed");
1170 if (!csp->dont_verify_certificate)
1172 long verify_result = SSL_get_verify_result(ssl);
1173 if (verify_result == X509_V_OK)
1176 csp->server_cert_verification_result = SSL_CERT_VALID;
1180 csp->server_cert_verification_result = verify_result;
1181 log_error(LOG_LEVEL_ERROR,
1182 "X509 certificate verification for %s failed: %s",
1183 csp->http->hostport, X509_verify_cert_error_string(verify_result));
1189 log_error(LOG_LEVEL_CONNECT, "Server successfully connected over %s (%s).",
1190 SSL_get_version(ssl), SSL_get_cipher_name(ssl));
1193 * Server certificate chain is valid, so we can clean
1194 * chain, because we will not send it to client.
1196 free_certificate_chain(csp);
1198 csp->ssl_with_server_is_opened = 1;
1200 /* Freeing structures if connection wasn't created successfully */
1203 free_server_ssl_structures(csp);
1210 /*********************************************************************
1212 * Function : free_server_ssl_structures
1214 * Description : Frees structures used for SSL communication with server
1217 * 1 : csp = Current client state (buffers, headers, etc...)
1221 *********************************************************************/
1222 static void free_server_ssl_structures(struct client_state *csp)
1224 struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
1226 if (ssl_attr->openssl_attr.bio)
1228 BIO_free_all(ssl_attr->openssl_attr.bio);
1230 if (ssl_attr->openssl_attr.ctx)
1232 SSL_CTX_free(ssl_attr->openssl_attr.ctx);
1237 /*********************************************************************
1239 * Function : log_ssl_errors
1241 * Description : Log SSL errors
1244 * 1 : debuglevel = Debug level
1245 * 2 : desc = Error description
1249 *********************************************************************/
1250 static void log_ssl_errors(int debuglevel, const char* fmt, ...)
1252 unsigned long err_code;
1253 char prefix[ERROR_BUF_SIZE];
1255 va_start(args, fmt);
1256 vsnprintf(prefix, sizeof(prefix), fmt, args);
1259 while ((err_code = ERR_get_error()))
1261 char err_buf[ERROR_BUF_SIZE];
1263 ERR_error_string_n(err_code, err_buf, sizeof(err_buf));
1264 log_error(debuglevel, "%s: %s", prefix, err_buf);
1268 * In case if called by mistake and there were
1269 * no TLS/SSL errors let's report it to the log.
1273 log_error(debuglevel, "%s: no TLS/SSL errors detected", prefix);
1278 /*********************************************************************
1280 * Function : ssl_base64_encode
1282 * Description : Encode a buffer into base64 format.
1285 * 1 : dst = Destination buffer
1286 * 2 : dlen = Destination buffer length
1287 * 3 : olen = Number of bytes written
1288 * 4 : src = Source buffer
1289 * 5 : slen = Amount of data to be encoded
1291 * Returns : 0 on success, error code othervise
1293 *********************************************************************/
1294 extern int ssl_base64_encode(unsigned char *dst, size_t dlen, size_t *olen,
1295 const unsigned char *src, size_t slen)
1297 *olen = 4 * ((slen/3) + ((slen%3) ? 1 : 0)) + 1;
1302 *olen = (size_t)EVP_EncodeBlock(dst, src, (int)slen) + 1;
1307 /*********************************************************************
1309 * Function : close_file_stream
1311 * Description : Close file stream, report error on close error
1314 * 1 : f = file stream to close
1315 * 2 : path = path for error report
1319 *********************************************************************/
1320 static void close_file_stream(FILE *f, const char *path)
1324 log_error(LOG_LEVEL_ERROR,
1325 "Error closing file %s: %s", path, strerror(errno));
1330 /*********************************************************************
1332 * Function : write_certificate
1334 * Description : Writes certificate into file.
1337 * 1 : crt = certificate to write into file
1338 * 2 : output_file = path to save certificate file
1341 * Returns : 1 on success success or negative value
1343 *********************************************************************/
1344 static int write_certificate(X509 *crt, const char *output_file)
1350 * Saving certificate into file
1352 if ((f = fopen(output_file, "w")) == NULL)
1354 log_error(LOG_LEVEL_ERROR, "Opening file %s to save certificate failed",
1359 ret = PEM_write_X509(f, crt);
1362 log_ssl_errors(LOG_LEVEL_ERROR,
1363 "Writing certificate into file %s failed", output_file);
1367 close_file_stream(f, output_file);
1372 /*********************************************************************
1374 * Function : write_private_key
1376 * Description : Writes private key into file and copies saved
1377 * content into given pointer to string. If function
1378 * returns 0 for success, this copy must be freed by
1382 * 1 : key = key to write into file
1383 * 2 : ret_buf = pointer to string with created key file content
1384 * 3 : key_file_path = path where to save key file
1386 * Returns : Length of written private key on success or negative value
1389 *********************************************************************/
1390 static int write_private_key(EVP_PKEY *key, char **ret_buf,
1391 const char *key_file_path)
1393 size_t len = 0; /* Length of created key */
1394 FILE *f = NULL; /* File to save certificate */
1396 BIO *bio_mem = BIO_new(BIO_s_mem());
1397 char *bio_mem_data = 0;
1399 if (bio_mem == NULL)
1401 log_ssl_errors(LOG_LEVEL_ERROR, "write_private_key memory allocation failure");
1406 * Writing private key into PEM string
1408 if (!PEM_write_bio_PrivateKey(bio_mem, key, NULL, NULL, 0, NULL, NULL))
1410 log_ssl_errors(LOG_LEVEL_ERROR,
1411 "Writing private key into PEM string failed");
1416 len = (size_t)BIO_get_mem_data(bio_mem, &bio_mem_data);
1418 /* Initializing buffer for key file content */
1419 *ret_buf = zalloc_or_die(len + 1);
1420 (*ret_buf)[len] = 0;
1422 strncpy(*ret_buf, bio_mem_data, len);
1425 * Saving key into file
1427 if ((f = fopen(key_file_path, "wb")) == NULL)
1429 log_error(LOG_LEVEL_ERROR,
1430 "Opening file %s to save private key failed: %E",
1436 if (fwrite(*ret_buf, 1, len, f) != len)
1438 log_error(LOG_LEVEL_ERROR,
1439 "Writing private key into file %s failed",
1441 close_file_stream(f, key_file_path);
1446 close_file_stream(f, key_file_path);
1460 /*********************************************************************
1462 * Function : generate_key
1464 * Description : Tests if private key for host saved in csp already
1465 * exists. If this file doesn't exists, a new key is
1466 * generated and saved in a file. The generated key is also
1467 * copied into given parameter key_buf, which must be then
1468 * freed by caller. If file with key exists, key_buf
1469 * contain NULL and no private key is generated.
1472 * 1 : csp = Current client state (buffers, headers, etc...)
1473 * 2 : key_buf = buffer to save new generated key
1475 * Returns : -1 => Error while generating private key
1476 * 0 => Key already exists
1477 * >0 => Length of generated private key
1479 *********************************************************************/
1480 static int generate_key(struct client_state *csp, char **key_buf)
1483 char* key_file_path;
1484 #if (OPENSSL_VERSION_NUMBER < 0x30000000L)
1490 key_file_path = make_certs_path(csp->config->certificate_directory,
1491 (char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
1492 if (key_file_path == NULL)
1498 * Test if key already exists. If so, we don't have to create it again.
1500 if (file_exists(key_file_path) == 1)
1502 freez(key_file_path);
1506 #if (OPENSSL_VERSION_NUMBER < 0x30000000L)
1509 key = EVP_PKEY_new();
1510 if (exp == NULL || rsa == NULL || key == NULL)
1512 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key memory allocation failure");
1517 if (BN_set_word(exp, RSA_KEY_PUBLIC_EXPONENT) != 1)
1519 log_ssl_errors(LOG_LEVEL_ERROR, "Setting RSA key exponent failed");
1524 ret = RSA_generate_key_ex(rsa, RSA_KEYSIZE, exp, NULL);
1527 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key generation failure");
1532 if (!EVP_PKEY_set1_RSA(key, rsa))
1534 log_ssl_errors(LOG_LEVEL_ERROR,
1535 "Error assigning RSA key pair to PKEY structure");
1540 key = EVP_RSA_gen(RSA_KEYSIZE);
1543 log_error(LOG_LEVEL_ERROR, "EVP_RSA_gen() failed");
1550 * Exporting private key into file
1552 if ((ret = write_private_key(key, key_buf, key_file_path)) < 0)
1554 log_error(LOG_LEVEL_ERROR,
1555 "Writing private key into file %s failed", key_file_path);
1562 * Freeing used variables
1564 #if (OPENSSL_VERSION_NUMBER < 0x30000000L)
1578 freez(key_file_path);
1584 /*********************************************************************
1586 * Function : ssl_certificate_load
1588 * Description : Loads certificate from file.
1591 * 1 : cert_path = The certificate path to load
1593 * Returns : NULL => error loading certificate,
1594 * pointer to certificate instance otherwise
1596 *********************************************************************/
1597 static X509 *ssl_certificate_load(const char *cert_path)
1600 FILE *cert_f = NULL;
1602 if (!(cert_f = fopen(cert_path, "r")))
1604 log_error(LOG_LEVEL_ERROR,
1605 "Error opening certificate file %s: %s", cert_path, strerror(errno));
1609 if (!(cert = PEM_read_X509(cert_f, NULL, NULL, NULL)))
1611 log_ssl_errors(LOG_LEVEL_ERROR,
1612 "Error reading certificate file %s", cert_path);
1615 close_file_stream(cert_f, cert_path);
1620 /*********************************************************************
1622 * Function : ssl_certificate_is_invalid
1624 * Description : Checks whether or not a certificate is valid.
1625 * Currently only checks that the certificate can be
1626 * parsed and that the "valid to" date is in the future.
1629 * 1 : cert_file = The certificate to check
1631 * Returns : 0 => The certificate is valid.
1632 * 1 => The certificate is invalid
1634 *********************************************************************/
1635 static int ssl_certificate_is_invalid(const char *cert_file)
1641 if (!(cert = ssl_certificate_load(cert_file)))
1646 ret = X509_cmp_current_time(X509_get_notAfter(cert));
1649 log_ssl_errors(LOG_LEVEL_ERROR,
1650 "Error checking certificate %s validity", cert_file);
1656 return ret == -1 ? 1 : 0;
1660 /*********************************************************************
1662 * Function : set_x509_ext
1664 * Description : Sets the X509V3 extension data
1667 * 1 : cert = The certificate to modify
1668 * 2 : issuer = Issuer certificate
1669 * 3 : nid = OpenSSL NID
1670 * 4 : value = extension value
1672 * Returns : 0 => Error while setting extension data
1675 *********************************************************************/
1676 static int set_x509_ext(X509 *cert, X509 *issuer, int nid, char *value)
1678 X509_EXTENSION *ext = NULL;
1682 X509V3_set_ctx(&ctx, issuer, cert, NULL, NULL, 0);
1683 ext = X509V3_EXT_conf_nid(NULL, &ctx, nid, value);
1686 log_ssl_errors(LOG_LEVEL_ERROR, "X509V3_EXT_conf_nid failure");
1690 if (!X509_add_ext(cert, ext, -1))
1692 log_ssl_errors(LOG_LEVEL_ERROR, "X509_add_ext failure");
1700 X509_EXTENSION_free(ext);
1706 /*********************************************************************
1708 * Function : set_subject_alternative_name
1710 * Description : Sets the Subject Alternative Name extension to a cert
1713 * 1 : cert = The certificate to modify
1714 * 2 : issuer = Issuer certificate
1715 * 3 : hostname = The hostname to add
1717 * Returns : 0 => Error while creating certificate.
1720 *********************************************************************/
1721 static int set_subject_alternative_name(X509 *cert, X509 *issuer, const char *hostname)
1723 size_t altname_len = strlen(hostname) + sizeof(CERTIFICATE_ALT_NAME_PREFIX);
1724 char alt_name_buf[altname_len];
1726 snprintf(alt_name_buf, sizeof(alt_name_buf),
1727 CERTIFICATE_ALT_NAME_PREFIX"%s", hostname);
1728 return set_x509_ext(cert, issuer, NID_subject_alt_name, alt_name_buf);
1732 /*********************************************************************
1734 * Function : generate_host_certificate
1736 * Description : Creates certificate file in presetted directory.
1737 * If certificate already exists, no other certificate
1738 * will be created. Subject of certificate is named
1739 * by csp->http->host from parameter. This function also
1740 * triggers generating of private key for new certificate.
1743 * 1 : csp = Current client state (buffers, headers, etc...)
1745 * Returns : -1 => Error while creating certificate.
1746 * 0 => Certificate already exists.
1747 * 1 => Certificate created
1749 *********************************************************************/
1750 static int generate_host_certificate(struct client_state *csp)
1752 char *key_buf = NULL; /* Buffer for created key */
1753 X509 *issuer_cert = NULL;
1756 EVP_PKEY *loaded_subject_key = NULL;
1757 EVP_PKEY *loaded_issuer_key = NULL;
1758 X509_NAME *issuer_name;
1759 X509_NAME *subject_name = NULL;
1760 ASN1_TIME *asn_time = NULL;
1761 ASN1_INTEGER *serial = NULL;
1762 BIGNUM *serial_num = NULL;
1765 cert_options cert_opt;
1766 char cert_valid_from[VALID_DATETIME_BUFLEN];
1767 char cert_valid_to[VALID_DATETIME_BUFLEN];
1768 const char *common_name;
1769 enum { CERT_PARAM_COMMON_NAME_MAX = 64 };
1771 /* Paths to keys and certificates needed to create certificate */
1772 cert_opt.issuer_key = NULL;
1773 cert_opt.subject_key = NULL;
1774 cert_opt.issuer_crt = NULL;
1776 cert_opt.output_file = make_certs_path(csp->config->certificate_directory,
1777 (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
1778 if (cert_opt.output_file == NULL)
1783 cert_opt.subject_key = make_certs_path(csp->config->certificate_directory,
1784 (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
1785 if (cert_opt.subject_key == NULL)
1787 freez(cert_opt.output_file);
1791 if (enforce_sane_certificate_state(cert_opt.output_file,
1792 cert_opt.subject_key))
1794 freez(cert_opt.output_file);
1795 freez(cert_opt.subject_key);
1800 if (file_exists(cert_opt.output_file) == 1)
1802 /* The file exists, but is it valid? */
1803 if (ssl_certificate_is_invalid(cert_opt.output_file))
1805 log_error(LOG_LEVEL_CONNECT,
1806 "Certificate %s is no longer valid. Removing it.",
1807 cert_opt.output_file);
1808 if (unlink(cert_opt.output_file))
1810 log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
1811 cert_opt.output_file);
1813 freez(cert_opt.output_file);
1814 freez(cert_opt.subject_key);
1818 if (unlink(cert_opt.subject_key))
1820 log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
1821 cert_opt.subject_key);
1823 freez(cert_opt.output_file);
1824 freez(cert_opt.subject_key);
1831 freez(cert_opt.output_file);
1832 freez(cert_opt.subject_key);
1839 * Create key for requested host
1841 int subject_key_len = generate_key(csp, &key_buf);
1842 if (subject_key_len < 0)
1844 freez(cert_opt.output_file);
1845 freez(cert_opt.subject_key);
1846 log_error(LOG_LEVEL_ERROR, "Key generating failed");
1851 * Converting unsigned long serial number to char * serial number.
1852 * We must compute length of serial number in string + terminating null.
1854 unsigned long certificate_serial = get_certificate_serial(csp);
1855 unsigned long certificate_serial_time = (unsigned long)time(NULL);
1856 int serial_num_size = snprintf(NULL, 0, "%lu%lu",
1857 certificate_serial_time, certificate_serial) + 1;
1858 if (serial_num_size <= 0)
1860 serial_num_size = 1;
1863 char serial_num_text[serial_num_size]; /* Buffer for serial number */
1864 ret = snprintf(serial_num_text, (size_t)serial_num_size, "%lu%lu",
1865 certificate_serial_time, certificate_serial);
1866 if (ret < 0 || ret >= serial_num_size)
1868 log_error(LOG_LEVEL_ERROR,
1869 "Converting certificate serial number into string failed");
1875 * Preparing parameters for certificate
1877 subject_name = X509_NAME_new();
1880 log_ssl_errors(LOG_LEVEL_ERROR, "X509 memory allocation failure");
1886 * Make sure OpenSSL doesn't reject the common name due to its length.
1887 * The clients should only care about the Subject Alternative Name anyway
1888 * and we always use the real host name for that.
1890 common_name = (strlen(csp->http->host) > CERT_PARAM_COMMON_NAME_MAX) ?
1891 CGI_SITE_2_HOST : csp->http->host;
1892 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_COMMON_NAME_FCODE,
1893 MBSTRING_ASC, (void *)common_name, -1, -1, 0))
1895 log_ssl_errors(LOG_LEVEL_ERROR,
1896 "X509 subject name (code: %s, val: %s) error",
1897 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1901 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_ORGANIZATION_FCODE,
1902 MBSTRING_ASC, (void *)common_name, -1, -1, 0))
1904 log_ssl_errors(LOG_LEVEL_ERROR,
1905 "X509 subject name (code: %s, val: %s) error",
1906 CERT_PARAM_ORGANIZATION_FCODE, csp->http->host);
1910 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_ORG_UNIT_FCODE,
1911 MBSTRING_ASC, (void *)common_name, -1, -1, 0))
1913 log_ssl_errors(LOG_LEVEL_ERROR,
1914 "X509 subject name (code: %s, val: %s) error",
1915 CERT_PARAM_ORG_UNIT_FCODE, csp->http->host);
1919 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_COUNTRY_FCODE,
1920 MBSTRING_ASC, (void *)CERT_PARAM_COUNTRY_CODE, -1, -1, 0))
1922 log_ssl_errors(LOG_LEVEL_ERROR,
1923 "X509 subject name (code: %s, val: %s) error",
1924 CERT_PARAM_COUNTRY_FCODE, CERT_PARAM_COUNTRY_CODE);
1929 cert_opt.issuer_crt = csp->config->ca_cert_file;
1930 cert_opt.issuer_key = csp->config->ca_key_file;
1932 if (get_certificate_valid_from_date(cert_valid_from,
1933 sizeof(cert_valid_from), VALID_DATETIME_FMT)
1934 || get_certificate_valid_to_date(cert_valid_to,
1935 sizeof(cert_valid_to), VALID_DATETIME_FMT))
1937 log_error(LOG_LEVEL_ERROR, "Generating one of the validity dates failed");
1942 cert_opt.subject_pwd = CERT_SUBJECT_PASSWORD;
1943 cert_opt.issuer_pwd = csp->config->ca_password;
1944 cert_opt.not_before = cert_valid_from;
1945 cert_opt.not_after = cert_valid_to;
1946 cert_opt.serial = serial_num_text;
1947 cert_opt.max_pathlen = -1;
1950 * Test if the private key was already created.
1951 * XXX: Can this still happen?
1953 if (subject_key_len == 0)
1955 log_error(LOG_LEVEL_ERROR, "Subject key was already created");
1961 * Parse serial to MPI
1963 serial_num = BN_new();
1966 log_error(LOG_LEVEL_ERROR, "generate_host_certificate: memory error");
1970 if (!BN_dec2bn(&serial_num, cert_opt.serial))
1972 log_ssl_errors(LOG_LEVEL_ERROR, "Failed to parse serial %s", cert_opt.serial);
1977 if (!(serial = BN_to_ASN1_INTEGER(serial_num, NULL)))
1979 log_ssl_errors(LOG_LEVEL_ERROR, "Failed to generate serial ASN1 representation");
1985 * Loading certificates
1987 if (!(issuer_cert = ssl_certificate_load(cert_opt.issuer_crt)))
1989 log_error(LOG_LEVEL_ERROR, "Loading issuer certificate %s failed",
1990 cert_opt.issuer_crt);
1995 issuer_name = X509_get_subject_name(issuer_cert);
1998 * Loading keys from file or from buffer
2000 if (key_buf != NULL && subject_key_len > 0)
2002 pk_bio = BIO_new_mem_buf(key_buf, subject_key_len);
2004 else if (!(pk_bio = BIO_new_file(cert_opt.subject_key, "r")))
2006 log_ssl_errors(LOG_LEVEL_ERROR,
2007 "Failure opening subject key %s BIO", cert_opt.subject_key);
2012 loaded_subject_key = PEM_read_bio_PrivateKey(pk_bio, NULL, NULL,
2013 (void *)cert_opt.subject_pwd);
2014 if (!loaded_subject_key)
2016 log_ssl_errors(LOG_LEVEL_ERROR, "Parsing subject key %s failed",
2017 cert_opt.subject_key);
2022 if (!BIO_free(pk_bio))
2024 log_ssl_errors(LOG_LEVEL_ERROR, "Error closing subject key BIO");
2027 if (!(pk_bio = BIO_new_file(cert_opt.issuer_key, "r")))
2029 log_ssl_errors(LOG_LEVEL_ERROR, "Failure opening issuer key %s BIO",
2030 cert_opt.issuer_key);
2035 loaded_issuer_key = PEM_read_bio_PrivateKey(pk_bio, NULL, NULL,
2036 (void *)cert_opt.issuer_pwd);
2037 if (!loaded_issuer_key)
2039 log_ssl_errors(LOG_LEVEL_ERROR, "Parsing issuer key %s failed",
2040 cert_opt.subject_key);
2048 log_ssl_errors(LOG_LEVEL_ERROR, "Certificate allocation error");
2053 if (!X509_set_version(cert, CERTIFICATE_VERSION))
2055 log_ssl_errors(LOG_LEVEL_ERROR, "X509_set_version failed");
2061 * Setting parameters of signed certificate
2063 if (!X509_set_pubkey(cert, loaded_subject_key))
2065 log_ssl_errors(LOG_LEVEL_ERROR,
2066 "Setting public key in signed certificate failed");
2071 if (!X509_set_subject_name(cert, subject_name))
2073 log_ssl_errors(LOG_LEVEL_ERROR,
2074 "Setting subject name in signed certificate failed");
2079 if (!X509_set_issuer_name(cert, issuer_name))
2081 log_ssl_errors(LOG_LEVEL_ERROR,
2082 "Setting issuer name in signed certificate failed");
2087 if (!X509_set_serialNumber(cert, serial))
2089 log_ssl_errors(LOG_LEVEL_ERROR,
2090 "Setting serial number in signed certificate failed");
2095 asn_time = ASN1_TIME_new();
2098 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time memory allocation failure");
2103 if (!ASN1_TIME_set_string(asn_time, cert_opt.not_after))
2105 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time [%s] encode error", cert_opt.not_after);
2110 if (!X509_set1_notAfter(cert, asn_time))
2112 log_ssl_errors(LOG_LEVEL_ERROR,
2113 "Setting valid not after in signed certificate failed");
2118 if (!ASN1_TIME_set_string(asn_time, cert_opt.not_before))
2120 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time encode error");
2125 if (!X509_set1_notBefore(cert, asn_time))
2127 log_ssl_errors(LOG_LEVEL_ERROR,
2128 "Setting valid not before in signed certificate failed");
2133 if (!set_x509_ext(cert, issuer_cert, NID_basic_constraints, CERTIFICATE_BASIC_CONSTRAINTS))
2135 log_ssl_errors(LOG_LEVEL_ERROR, "Setting the basicConstraints extension "
2136 "in signed certificate failed");
2141 if (!set_x509_ext(cert, issuer_cert, NID_subject_key_identifier, CERTIFICATE_SUBJECT_KEY))
2143 log_ssl_errors(LOG_LEVEL_ERROR,
2144 "Setting the Subject Key Identifier extension failed");
2149 if (!set_x509_ext(cert, issuer_cert, NID_authority_key_identifier, CERTIFICATE_AUTHORITY_KEY))
2151 log_ssl_errors(LOG_LEVEL_ERROR,
2152 "Setting the Authority Key Identifier extension failed");
2157 if (!host_is_ip_address(csp->http->host) &&
2158 !set_subject_alternative_name(cert, issuer_cert, csp->http->host))
2160 log_ssl_errors(LOG_LEVEL_ERROR,
2161 "Setting the Subject Alt Name extension failed");
2166 if (!X509_sign(cert, loaded_issuer_key, EVP_sha256()))
2168 log_ssl_errors(LOG_LEVEL_ERROR, "Signing certificate failed");
2174 * Writing certificate into file
2176 if (write_certificate(cert, cert_opt.output_file) < 0)
2178 log_error(LOG_LEVEL_ERROR, "Writing certificate into file failed");
2187 * Freeing used structures
2191 X509_free(issuer_cert);
2197 if (pk_bio && !BIO_free(pk_bio))
2199 log_ssl_errors(LOG_LEVEL_ERROR, "Error closing pk BIO");
2201 if (loaded_subject_key)
2203 EVP_PKEY_free(loaded_subject_key);
2205 if (loaded_issuer_key)
2207 EVP_PKEY_free(loaded_issuer_key);
2211 X509_NAME_free(subject_name);
2215 ASN1_TIME_free(asn_time);
2219 BN_free(serial_num);
2223 ASN1_INTEGER_free(serial);
2225 freez(cert_opt.subject_key);
2226 freez(cert_opt.output_file);
2233 /*********************************************************************
2235 * Function : ssl_crt_verify_info
2237 * Description : Returns an informational string about the verification
2238 * status of a certificate.
2241 * 1 : buf = Buffer to write to
2242 * 2 : size = Maximum size of buffer
2243 * 3 : csp = client state
2247 *********************************************************************/
2248 extern void ssl_crt_verify_info(char *buf, size_t size, struct client_state *csp)
2250 strncpy(buf, X509_verify_cert_error_string(csp->server_cert_verification_result), size);
2255 #ifdef FEATURE_GRACEFUL_TERMINATION
2256 /*********************************************************************
2258 * Function : ssl_release
2260 * Description : Release all SSL resources
2266 *********************************************************************/
2267 extern void ssl_release(void)
2269 if (ssl_inited == 1)
2271 #if OPENSSL_VERSION_NUMBER >= 0x1000200fL
2272 #ifndef LIBRESSL_VERSION_NUMBER
2273 #ifndef OPENSSL_NO_COMP
2274 SSL_COMP_free_compression_methods();
2278 CONF_modules_free();
2279 CONF_modules_unload(1);
2280 #ifndef OPENSSL_NO_COMP
2281 COMP_zlib_cleanup();
2287 CRYPTO_cleanup_all_ex_data();
2290 #endif /* def FEATURE_GRACEFUL_TERMINATION */