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) 2018-2020 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/md5.h>
40 #include <openssl/x509v3.h>
49 #include "ssl_common.h"
52 * Macros for openssl.c
54 #define CERTIFICATE_BASIC_CONSTRAINTS "CA:FALSE"
55 #define CERTIFICATE_SUBJECT_KEY "hash"
56 #define CERTIFICATE_AUTHORITY_KEY "keyid:always"
57 #define CERTIFICATE_ALT_NAME_PREFIX "DNS:"
58 #define CERTIFICATE_VERSION 2
59 #define VALID_DATETIME_FMT "%y%m%d%H%M%SZ"
60 #define VALID_DATETIME_BUFLEN 16
62 static int generate_host_certificate(struct client_state *csp);
63 static void free_client_ssl_structures(struct client_state *csp);
64 static void free_server_ssl_structures(struct client_state *csp);
65 static int ssl_store_cert(struct client_state *csp, X509 *crt);
66 static void log_ssl_errors(int debuglevel, const char* fmt, ...) __attribute__((format(printf, 2, 3)));
68 static int ssl_inited = 0;
70 #if OPENSSL_VERSION_NUMBER < 0x10100000L
71 #define X509_set1_notBefore X509_set_notBefore
72 #define X509_set1_notAfter X509_set_notAfter
73 #define X509_get0_serialNumber X509_get_serialNumber
74 #define X509_get0_notBefore X509_get_notBefore
75 #define X509_get0_notAfter X509_get_notAfter
78 /*********************************************************************
80 * Function : openssl_init
82 * Description : Initializes OpenSSL library once
88 *********************************************************************/
89 static void openssl_init(void)
93 privoxy_mutex_lock(&ssl_init_mutex);
96 #if OPENSSL_VERSION_NUMBER < 0x10100000L
99 OPENSSL_init_ssl(0, NULL);
101 SSL_load_error_strings();
102 OpenSSL_add_ssl_algorithms();
105 privoxy_mutex_unlock(&ssl_init_mutex);
110 /*********************************************************************
112 * Function : is_ssl_pending
114 * Description : Tests if there are some waiting data on ssl connection.
115 * Only considers data that has actually been received
116 * locally and ignores data that is still on the fly
117 * or has not yet been sent by the remote end.
120 * 1 : ssl_attr = SSL context to test
122 * Returns : 0 => No data are pending
123 * >0 => Pending data length
125 *********************************************************************/
126 extern size_t is_ssl_pending(struct ssl_attr *ssl_attr)
128 BIO *bio = ssl_attr->openssl_attr.bio;
134 return (size_t)BIO_pending(bio);
138 /*********************************************************************
140 * Function : ssl_send_data
142 * Description : Sends the content of buf (for n bytes) to given SSL
143 * connection context.
146 * 1 : ssl_attr = SSL context to send data to
147 * 2 : buf = Pointer to data to be sent
148 * 3 : len = Length of data to be sent to the SSL context
150 * Returns : Length of sent data or negative value on error.
152 *********************************************************************/
153 extern int ssl_send_data(struct ssl_attr *ssl_attr, const unsigned char *buf, size_t len)
155 BIO *bio = ssl_attr->openssl_attr.bio;
158 int pos = 0; /* Position of unsent part in buffer */
166 if (BIO_get_ssl(bio, &ssl) == 1)
168 fd = SSL_get_fd(ssl);
173 int send_len = (int)len - pos;
175 log_error(LOG_LEVEL_WRITING, "TLS on socket %d: %N",
176 fd, send_len, buf+pos);
179 * Sending one part of the buffer
181 while ((ret = BIO_write(bio,
182 (const unsigned char *)(buf + pos),
185 if (!BIO_should_retry(bio))
187 log_ssl_errors(LOG_LEVEL_ERROR,
188 "Sending data on socket %d over TLS/SSL failed", fd);
192 /* Adding count of sent bytes to position in buffer */
200 /*********************************************************************
202 * Function : ssl_recv_data
204 * Description : Receives data from given SSL context and puts
208 * 1 : ssl_attr = SSL context to receive data from
209 * 2 : buf = Pointer to buffer where data will be written
210 * 3 : max_length = Maximum number of bytes to read
212 * Returns : Number of bytes read, 0 for EOF, or -1
215 *********************************************************************/
216 extern int ssl_recv_data(struct ssl_attr *ssl_attr, unsigned char *buf, size_t max_length)
218 BIO *bio = ssl_attr->openssl_attr.bio;
223 memset(buf, 0, max_length);
226 * Receiving data from SSL context into buffer
230 ret = BIO_read(bio, buf, (int)max_length);
231 } while (ret <= 0 && BIO_should_retry(bio));
233 if (BIO_get_ssl(bio, &ssl) == 1)
235 fd = SSL_get_fd(ssl);
240 log_ssl_errors(LOG_LEVEL_ERROR,
241 "Receiving data on socket %d over TLS/SSL failed", fd);
246 log_error(LOG_LEVEL_RECEIVED, "TLS from socket %d: %N",
253 /*********************************************************************
255 * Function : ssl_store_cert
257 * Description : This function is called once for each certificate in the
258 * server's certificate trusted chain and prepares
259 * information about the certificate. The information can
260 * be used to inform the user about invalid certificates.
263 * 1 : csp = Current client state (buffers, headers, etc...)
264 * 2 : crt = certificate from trusted chain
266 * Returns : 0 on success and negative value on error
268 *********************************************************************/
269 static int ssl_store_cert(struct client_state *csp, X509 *crt)
272 struct certs_chain *last = &(csp->server_certs_chain);
274 BIO *bio = BIO_new(BIO_s_mem());
275 EVP_PKEY *pkey = NULL;
276 char *bio_mem_data = NULL;
279 const ASN1_INTEGER *bs;
280 #if OPENSSL_VERSION_NUMBER > 0x10100000L
281 const X509_ALGOR *tsig_alg;
287 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new() failed");
292 * Searching for last item in certificates linked list
294 while (last->next != NULL)
300 * Preparing next item in linked list for next certificate
302 last->next = malloc_or_die(sizeof(struct certs_chain));
303 last->next->next = NULL;
304 memset(last->next->info_buf, 0, sizeof(last->next->info_buf));
305 memset(last->next->file_buf, 0, sizeof(last->next->file_buf));
308 * Saving certificate file into buffer
310 if (!PEM_write_bio_X509(bio, crt))
312 log_ssl_errors(LOG_LEVEL_ERROR, "PEM_write_bio_X509() failed");
317 len = BIO_get_mem_data(bio, &bio_mem_data);
319 if (len > (sizeof(last->file_buf) - 1))
321 log_error(LOG_LEVEL_ERROR,
322 "X509 PEM cert len %ld is larger than buffer len %lu",
323 len, sizeof(last->file_buf) - 1);
324 len = sizeof(last->file_buf) - 1;
327 strncpy(last->file_buf, bio_mem_data, (size_t)len);
329 bio = BIO_new(BIO_s_mem());
332 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new() failed");
338 * Saving certificate information into buffer
340 l = X509_get_version(crt);
341 if (l >= 0 && l <= 2)
343 if (BIO_printf(bio, "cert. version : %ld\n", l + 1) <= 0)
345 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for version failed");
352 if (BIO_printf(bio, "cert. version : Unknown (%ld)\n", l) <= 0)
354 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for version failed");
360 if (BIO_puts(bio, "serial number : ") <= 0)
362 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for serial failed");
366 bs = X509_get0_serialNumber(crt);
367 if (bs->length <= (int)sizeof(long))
370 l = ASN1_INTEGER_get(bs);
381 if (bs->type == V_ASN1_NEG_INTEGER)
383 ul = 0 - (unsigned long)l;
388 ul = (unsigned long)l;
391 if (BIO_printf(bio, "%s%lu (%s0x%lx)\n", neg, ul, neg, ul) <= 0)
393 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for serial failed");
401 if (bs->type == V_ASN1_NEG_INTEGER)
403 if (BIO_puts(bio, " (Negative)") < 0)
405 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for serial failed");
410 for (i = 0; i < bs->length; i++)
412 if (BIO_printf(bio, "%02x%c", bs->data[i],
413 ((i + 1 == bs->length) ? '\n' : ':')) <= 0)
415 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for serial failed");
422 if (BIO_puts(bio, "issuer name : ") <= 0)
424 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for issuer failed");
428 if (X509_NAME_print_ex(bio, X509_get_issuer_name(crt), 0, 0) < 0)
430 log_ssl_errors(LOG_LEVEL_ERROR, "X509_NAME_print_ex() for issuer failed");
435 if (BIO_puts(bio, "\nsubject name : ") <= 0)
437 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for subject failed");
441 if (X509_NAME_print_ex(bio, X509_get_subject_name(crt), 0, 0) < 0) {
442 log_ssl_errors(LOG_LEVEL_ERROR, "X509_NAME_print_ex() for subject failed");
447 if (BIO_puts(bio, "\nissued on : ") <= 0)
449 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for issued on failed");
453 if (!ASN1_TIME_print(bio, X509_get0_notBefore(crt)))
455 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_TIME_print() for issued on failed");
460 if (BIO_puts(bio, "\nexpires on : ") <= 0)
462 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for expires on failed");
466 if (!ASN1_TIME_print(bio, X509_get0_notAfter(crt)))
468 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_TIME_print() for expires on failed");
473 #if OPENSSL_VERSION_NUMBER > 0x10100000L
474 if (BIO_puts(bio, "\nsigned using : ") <= 0)
476 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for signed using failed");
480 tsig_alg = X509_get0_tbs_sigalg(crt);
481 if (!i2a_ASN1_OBJECT(bio, tsig_alg->algorithm))
483 log_ssl_errors(LOG_LEVEL_ERROR, "i2a_ASN1_OBJECT() for signed using failed");
488 pkey = X509_get_pubkey(crt);
491 log_ssl_errors(LOG_LEVEL_ERROR, "X509_get_pubkey() failed");
496 switch (EVP_PKEY_base_id(pkey))
499 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "RSA key size", EVP_PKEY_bits(pkey));
502 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "DSA key size", EVP_PKEY_bits(pkey));
505 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "EC key size", EVP_PKEY_bits(pkey));
508 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "non-RSA/DSA/EC key size",
509 EVP_PKEY_bits(pkey));
514 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for key size failed");
519 loc = X509_get_ext_by_NID(crt, NID_basic_constraints, -1);
522 X509_EXTENSION *ex = X509_get_ext(crt, loc);
523 if (BIO_puts(bio, "\nbasic constraints : ") <= 0)
525 log_ssl_errors(LOG_LEVEL_ERROR,
526 "BIO_printf() for basic constraints failed");
530 if (!X509V3_EXT_print(bio, ex, 0, 0))
532 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex), ASN1_STRFLGS_RFC2253))
534 log_ssl_errors(LOG_LEVEL_ERROR,
535 "ASN1_STRING_print_ex() for basic constraints failed");
542 loc = X509_get_ext_by_NID(crt, NID_subject_alt_name, -1);
545 X509_EXTENSION *ex = X509_get_ext(crt, loc);
546 if (BIO_puts(bio, "\nsubject alt name : ") <= 0)
548 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for alt name failed");
552 if (!X509V3_EXT_print(bio, ex, 0, 0))
554 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
555 ASN1_STRFLGS_RFC2253))
557 log_ssl_errors(LOG_LEVEL_ERROR,
558 "ASN1_STRING_print_ex() for alt name failed");
565 loc = X509_get_ext_by_NID(crt, NID_netscape_cert_type, -1);
568 X509_EXTENSION *ex = X509_get_ext(crt, loc);
569 if (BIO_puts(bio, "\ncert. type : ") <= 0)
571 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for cert type failed");
575 if (!X509V3_EXT_print(bio, ex, 0, 0))
577 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
578 ASN1_STRFLGS_RFC2253))
580 log_ssl_errors(LOG_LEVEL_ERROR,
581 "ASN1_STRING_print_ex() for cert type failed");
588 loc = X509_get_ext_by_NID(crt, NID_key_usage, -1);
591 X509_EXTENSION *ex = X509_get_ext(crt, loc);
592 if (BIO_puts(bio, "\nkey usage : ") <= 0)
594 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for key usage failed");
598 if (!X509V3_EXT_print(bio, ex, 0, 0))
600 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
601 ASN1_STRFLGS_RFC2253))
603 log_ssl_errors(LOG_LEVEL_ERROR,
604 "ASN1_STRING_print_ex() for key usage failed");
611 loc = X509_get_ext_by_NID(crt, NID_ext_key_usage, -1);
613 X509_EXTENSION *ex = X509_get_ext(crt, loc);
614 if (BIO_puts(bio, "\next key usage : ") <= 0)
616 log_ssl_errors(LOG_LEVEL_ERROR,
617 "BIO_printf() for ext key usage failed");
621 if (!X509V3_EXT_print(bio, ex, 0, 0))
623 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
624 ASN1_STRFLGS_RFC2253))
626 log_ssl_errors(LOG_LEVEL_ERROR,
627 "ASN1_STRING_print_ex() for ext key usage failed");
634 loc = X509_get_ext_by_NID(crt, NID_certificate_policies, -1);
637 X509_EXTENSION *ex = X509_get_ext(crt, loc);
638 if (BIO_puts(bio, "\ncertificate policies : ") <= 0)
640 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for certificate policies failed");
644 if (!X509V3_EXT_print(bio, ex, 0, 0))
646 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
647 ASN1_STRFLGS_RFC2253))
649 log_ssl_errors(LOG_LEVEL_ERROR,
650 "ASN1_STRING_print_ex() for certificate policies failed");
657 /* make valgrind happy */
658 static const char zero = 0;
659 BIO_write(bio, &zero, 1);
661 len = BIO_get_mem_data(bio, &bio_mem_data);
664 log_error(LOG_LEVEL_ERROR, "BIO_get_mem_data() returned %ld "
665 "while gathering certificate information", len);
669 encoded_text = html_encode(bio_mem_data);
670 if (encoded_text == NULL)
672 log_error(LOG_LEVEL_ERROR,
673 "Failed to HTML-encode the certificate information");
678 strlcpy(last->info_buf, encoded_text, sizeof(last->info_buf));
695 /*********************************************************************
697 * Function : host_to_hash
699 * Description : Creates MD5 hash from host name. Host name is loaded
700 * from structure csp and saved again into it.
703 * 1 : csp = Current client state (buffers, headers, etc...)
705 * Returns : -1 => Error while creating hash
706 * 0 => Hash created successfully
708 *********************************************************************/
709 static int host_to_hash(struct client_state *csp)
713 memset(csp->http->hash_of_host, 0, sizeof(csp->http->hash_of_host));
714 MD5((unsigned char *)csp->http->host, strlen(csp->http->host),
715 csp->http->hash_of_host);
717 /* Converting hash into string with hex */
721 if ((ret = sprintf((char *)csp->http->hash_of_host_hex + 2 * i, "%02x",
722 csp->http->hash_of_host[i])) < 0)
724 log_error(LOG_LEVEL_ERROR, "Sprintf return value: %d", ret);
733 /*********************************************************************
735 * Function : create_client_ssl_connection
737 * Description : Creates TLS/SSL secured connection with client
740 * 1 : csp = Current client state (buffers, headers, etc...)
742 * Returns : 0 on success, negative value if connection wasn't created
745 *********************************************************************/
746 extern int create_client_ssl_connection(struct client_state *csp)
748 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
749 /* Paths to certificates file and key file */
750 char *key_file = NULL;
751 char *cert_file = NULL;
756 * Initializing OpenSSL structures for TLS/SSL connection
761 * Preparing hash of host for creating certificates
763 ret = host_to_hash(csp);
766 log_error(LOG_LEVEL_ERROR, "Generating hash of host failed: %d", ret);
772 * Preparing paths to certificates files and key file
774 cert_file = make_certs_path(csp->config->certificate_directory,
775 (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
776 key_file = make_certs_path(csp->config->certificate_directory,
777 (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
779 if (cert_file == NULL || key_file == NULL)
786 * Generating certificate for requested host. Mutex to prevent
787 * certificate and key inconsistence must be locked.
789 privoxy_mutex_lock(&certificate_mutex);
791 ret = generate_host_certificate(csp);
794 log_error(LOG_LEVEL_ERROR,
795 "generate_host_certificate failed: %d", ret);
796 privoxy_mutex_unlock(&certificate_mutex);
800 privoxy_mutex_unlock(&certificate_mutex);
802 if (!(ssl_attr->openssl_attr.ctx = SSL_CTX_new(SSLv23_server_method())))
804 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create SSL context");
809 /* Set the key and cert */
810 if (SSL_CTX_use_certificate_file(ssl_attr->openssl_attr.ctx,
811 cert_file, SSL_FILETYPE_PEM) != 1)
813 log_ssl_errors(LOG_LEVEL_ERROR,
814 "Loading webpage certificate %s failed", cert_file);
819 if (SSL_CTX_use_PrivateKey_file(ssl_attr->openssl_attr.ctx,
820 key_file, SSL_FILETYPE_PEM) != 1)
822 log_ssl_errors(LOG_LEVEL_ERROR,
823 "Loading webpage certificate private key %s failed", key_file);
828 SSL_CTX_set_options(ssl_attr->openssl_attr.ctx, SSL_OP_NO_SSLv3);
830 if (!(ssl_attr->openssl_attr.bio = BIO_new_ssl(ssl_attr->openssl_attr.ctx, 0)))
832 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create BIO structure");
837 if (BIO_get_ssl(ssl_attr->openssl_attr.bio, &ssl) != 1)
839 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_get_ssl failed");
844 if (!SSL_set_fd(ssl, csp->cfd))
846 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_fd failed");
851 if (csp->config->cipher_list != NULL)
853 if (!SSL_set_cipher_list(ssl, csp->config->cipher_list))
855 log_ssl_errors(LOG_LEVEL_ERROR,
856 "Setting the cipher list '%s' for the client connection failed",
857 csp->config->cipher_list);
864 * Handshake with client
866 log_error(LOG_LEVEL_CONNECT,
867 "Performing the TLS/SSL handshake with client. Hash of host: %s",
868 csp->http->hash_of_host_hex);
869 if (BIO_do_handshake(ssl_attr->openssl_attr.bio) != 1)
871 log_ssl_errors(LOG_LEVEL_ERROR,
872 "The TLS/SSL handshake with the client failed");
877 log_error(LOG_LEVEL_CONNECT, "Client successfully connected over %s (%s).",
878 SSL_get_version(ssl), SSL_get_cipher_name(ssl));
880 csp->ssl_with_client_is_opened = 1;
885 * Freeing allocated paths to files
890 /* Freeing structures if connection wasn't created successfully */
893 free_client_ssl_structures(csp);
899 /*********************************************************************
901 * Function : close_client_ssl_connection
903 * Description : Closes TLS/SSL connection with client. This function
904 * checks if this connection is already created.
907 * 1 : csp = Current client state (buffers, headers, etc...)
911 *********************************************************************/
912 extern void close_client_ssl_connection(struct client_state *csp)
914 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
917 if (csp->ssl_with_client_is_opened == 0)
923 * Notifying the peer that the connection is being closed.
925 BIO_ssl_shutdown(ssl_attr->openssl_attr.bio);
926 if (BIO_get_ssl(ssl_attr->openssl_attr.bio, &ssl) != 1)
928 log_ssl_errors(LOG_LEVEL_ERROR,
929 "BIO_get_ssl() failed in close_client_ssl_connection()");
934 * Pretend we received a shutdown alert so
935 * the BIO_free_all() call later on returns
938 SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);
940 free_client_ssl_structures(csp);
941 csp->ssl_with_client_is_opened = 0;
945 /*********************************************************************
947 * Function : free_client_ssl_structures
949 * Description : Frees structures used for SSL communication with
953 * 1 : csp = Current client state (buffers, headers, etc...)
957 *********************************************************************/
958 static void free_client_ssl_structures(struct client_state *csp)
960 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
962 if (ssl_attr->openssl_attr.bio)
964 BIO_free_all(ssl_attr->openssl_attr.bio);
966 if (ssl_attr->openssl_attr.ctx)
968 SSL_CTX_free(ssl_attr->openssl_attr.ctx);
973 /*********************************************************************
975 * Function : close_server_ssl_connection
977 * Description : Closes TLS/SSL connection with server. This function
978 * checks if this connection is already opened.
981 * 1 : csp = Current client state (buffers, headers, etc...)
985 *********************************************************************/
986 extern void close_server_ssl_connection(struct client_state *csp)
988 struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
991 if (csp->ssl_with_server_is_opened == 0)
997 * Notifying the peer that the connection is being closed.
999 BIO_ssl_shutdown(ssl_attr->openssl_attr.bio);
1000 if (BIO_get_ssl(ssl_attr->openssl_attr.bio, &ssl) != 1)
1002 log_ssl_errors(LOG_LEVEL_ERROR,
1003 "BIO_get_ssl() failed in close_server_ssl_connection()");
1008 * Pretend we received a shutdown alert so
1009 * the BIO_free_all() call later on returns
1012 SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);
1014 free_server_ssl_structures(csp);
1015 csp->ssl_with_server_is_opened = 0;
1019 /*********************************************************************
1021 * Function : create_server_ssl_connection
1023 * Description : Creates TLS/SSL secured connection with server.
1026 * 1 : csp = Current client state (buffers, headers, etc...)
1028 * Returns : 0 on success, negative value if connection wasn't created
1031 *********************************************************************/
1032 extern int create_server_ssl_connection(struct client_state *csp)
1034 openssl_connection_attr *ssl_attrs = &csp->ssl_server_attr.openssl_attr;
1036 char *trusted_cas_file = NULL;
1037 STACK_OF(X509) *chain;
1040 csp->server_cert_verification_result = SSL_CERT_NOT_VERIFIED;
1041 csp->server_certs_chain.next = NULL;
1043 /* Setting path to file with trusted CAs */
1044 trusted_cas_file = csp->config->trusted_cas_file;
1046 ssl_attrs->ctx = SSL_CTX_new(SSLv23_method());
1047 if (!ssl_attrs->ctx)
1049 log_ssl_errors(LOG_LEVEL_ERROR, "SSL context creation failed");
1055 * Loading file with trusted CAs
1057 if (!SSL_CTX_load_verify_locations(ssl_attrs->ctx, trusted_cas_file, NULL))
1059 log_ssl_errors(LOG_LEVEL_ERROR, "Loading trusted CAs file %s failed",
1065 SSL_CTX_set_verify(ssl_attrs->ctx, SSL_VERIFY_NONE, NULL);
1066 SSL_CTX_set_options(ssl_attrs->ctx, SSL_OP_NO_SSLv3);
1068 if (!(ssl_attrs->bio = BIO_new_ssl(ssl_attrs->ctx, 1)))
1070 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create BIO structure");
1075 if (BIO_get_ssl(ssl_attrs->bio, &ssl) != 1)
1077 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_get_ssl failed");
1082 if (!SSL_set_fd(ssl, csp->server_connection.sfd))
1084 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_fd failed");
1089 if (csp->config->cipher_list != NULL)
1091 if (!SSL_set_cipher_list(ssl, csp->config->cipher_list))
1093 log_ssl_errors(LOG_LEVEL_ERROR,
1094 "Setting the cipher list '%s' for the server connection failed",
1095 csp->config->cipher_list);
1102 * Set the hostname to check against the received server certificate
1104 #if OPENSSL_VERSION_NUMBER > 0x10100000L
1105 if (!SSL_set1_host(ssl, csp->http->host))
1107 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set1_host failed");
1112 if (host_is_ip_address(csp->http->host))
1114 if (X509_VERIFY_PARAM_set1_ip_asc(ssl->param, csp->http->host) != 1)
1116 log_ssl_errors(LOG_LEVEL_ERROR,
1117 "X509_VERIFY_PARAM_set1_ip_asc() failed");
1124 if (X509_VERIFY_PARAM_set1_host(ssl->param, csp->http->host, 0) != 1)
1126 log_ssl_errors(LOG_LEVEL_ERROR,
1127 "X509_VERIFY_PARAM_set1_host() failed");
1134 if (!SSL_set_tlsext_host_name(ssl, csp->http->host))
1136 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_tlsext_host_name failed");
1142 * Handshake with server
1144 log_error(LOG_LEVEL_CONNECT,
1145 "Performing the TLS/SSL handshake with the server");
1147 if (BIO_do_handshake(ssl_attrs->bio) != 1)
1149 log_ssl_errors(LOG_LEVEL_ERROR,
1150 "The TLS/SSL handshake with the server failed");
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;
1488 key_file_path = make_certs_path(csp->config->certificate_directory,
1489 (char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
1490 if (key_file_path == NULL)
1496 * Test if key already exists. If so, we don't have to create it again.
1498 if (file_exists(key_file_path) == 1)
1500 freez(key_file_path);
1506 key = EVP_PKEY_new();
1507 if (exp == NULL || rsa == NULL || key == NULL)
1509 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key memory allocation failure");
1514 if (BN_set_word(exp, RSA_KEY_PUBLIC_EXPONENT) != 1)
1516 log_ssl_errors(LOG_LEVEL_ERROR, "Setting RSA key exponent failed");
1521 ret = RSA_generate_key_ex(rsa, RSA_KEYSIZE, exp, NULL);
1524 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key generation failure");
1529 if (!EVP_PKEY_set1_RSA(key, rsa))
1531 log_ssl_errors(LOG_LEVEL_ERROR,
1532 "Error assigning RSA key pair to PKEY structure");
1538 * Exporting private key into file
1540 if ((ret = write_private_key(key, key_buf, key_file_path)) < 0)
1542 log_error(LOG_LEVEL_ERROR,
1543 "Writing private key into file %s failed", key_file_path);
1550 * Freeing used variables
1564 freez(key_file_path);
1570 /*********************************************************************
1572 * Function : ssl_certificate_load
1574 * Description : Loads certificate from file.
1577 * 1 : cert_path = The certificate path to load
1579 * Returns : NULL => error loading certificate,
1580 * pointer to certificate instance otherwise
1582 *********************************************************************/
1583 static X509 *ssl_certificate_load(const char *cert_path)
1586 FILE *cert_f = NULL;
1588 if (!(cert_f = fopen(cert_path, "r")))
1590 log_error(LOG_LEVEL_ERROR,
1591 "Error opening certificate file %s: %s", cert_path, strerror(errno));
1595 if (!(cert = PEM_read_X509(cert_f, NULL, NULL, NULL)))
1597 log_ssl_errors(LOG_LEVEL_ERROR,
1598 "Error reading certificate file %s", cert_path);
1601 close_file_stream(cert_f, cert_path);
1606 /*********************************************************************
1608 * Function : ssl_certificate_is_invalid
1610 * Description : Checks whether or not a certificate is valid.
1611 * Currently only checks that the certificate can be
1612 * parsed and that the "valid to" date is in the future.
1615 * 1 : cert_file = The certificate to check
1617 * Returns : 0 => The certificate is valid.
1618 * 1 => The certificate is invalid
1620 *********************************************************************/
1621 static int ssl_certificate_is_invalid(const char *cert_file)
1627 if (!(cert = ssl_certificate_load(cert_file)))
1632 ret = X509_cmp_current_time(X509_get_notAfter(cert));
1635 log_ssl_errors(LOG_LEVEL_ERROR,
1636 "Error checking certificate %s validity", cert_file);
1642 return ret == -1 ? 1 : 0;
1646 /*********************************************************************
1648 * Function : set_x509_ext
1650 * Description : Sets the X509V3 extension data
1653 * 1 : cert = The certificate to modify
1654 * 2 : issuer = Issuer certificate
1655 * 3 : nid = OpenSSL NID
1656 * 4 : value = extension value
1658 * Returns : 0 => Error while setting extension data
1661 *********************************************************************/
1662 static int set_x509_ext(X509 *cert, X509 *issuer, int nid, char *value)
1664 X509_EXTENSION *ext = NULL;
1668 X509V3_set_ctx(&ctx, issuer, cert, NULL, NULL, 0);
1669 ext = X509V3_EXT_conf_nid(NULL, &ctx, nid, value);
1672 log_ssl_errors(LOG_LEVEL_ERROR, "X509V3_EXT_conf_nid failure");
1676 if (!X509_add_ext(cert, ext, -1))
1678 log_ssl_errors(LOG_LEVEL_ERROR, "X509_add_ext failure");
1686 X509_EXTENSION_free(ext);
1692 /*********************************************************************
1694 * Function : set_subject_alternative_name
1696 * Description : Sets the Subject Alternative Name extension to a cert
1699 * 1 : cert = The certificate to modify
1700 * 2 : issuer = Issuer certificate
1701 * 3 : hostname = The hostname to add
1703 * Returns : 0 => Error while creating certificate.
1706 *********************************************************************/
1707 static int set_subject_alternative_name(X509 *cert, X509 *issuer, const char *hostname)
1709 size_t altname_len = strlen(hostname) + sizeof(CERTIFICATE_ALT_NAME_PREFIX);
1710 char alt_name_buf[altname_len];
1712 snprintf(alt_name_buf, sizeof(alt_name_buf),
1713 CERTIFICATE_ALT_NAME_PREFIX"%s", hostname);
1714 return set_x509_ext(cert, issuer, NID_subject_alt_name, alt_name_buf);
1718 /*********************************************************************
1720 * Function : generate_host_certificate
1722 * Description : Creates certificate file in presetted directory.
1723 * If certificate already exists, no other certificate
1724 * will be created. Subject of certificate is named
1725 * by csp->http->host from parameter. This function also
1726 * triggers generating of private key for new certificate.
1729 * 1 : csp = Current client state (buffers, headers, etc...)
1731 * Returns : -1 => Error while creating certificate.
1732 * 0 => Certificate already exists.
1733 * 1 => Certificate created
1735 *********************************************************************/
1736 static int generate_host_certificate(struct client_state *csp)
1738 char *key_buf = NULL; /* Buffer for created key */
1739 X509 *issuer_cert = NULL;
1742 EVP_PKEY *loaded_subject_key = NULL;
1743 EVP_PKEY *loaded_issuer_key = NULL;
1744 X509_NAME *issuer_name;
1745 X509_NAME *subject_name = NULL;
1746 ASN1_TIME *asn_time = NULL;
1747 ASN1_INTEGER *serial = NULL;
1748 BIGNUM *serial_num = NULL;
1751 cert_options cert_opt;
1752 char cert_valid_from[VALID_DATETIME_BUFLEN];
1753 char cert_valid_to[VALID_DATETIME_BUFLEN];
1755 /* Paths to keys and certificates needed to create certificate */
1756 cert_opt.issuer_key = NULL;
1757 cert_opt.subject_key = NULL;
1758 cert_opt.issuer_crt = NULL;
1760 cert_opt.output_file = make_certs_path(csp->config->certificate_directory,
1761 (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
1762 if (cert_opt.output_file == NULL)
1767 cert_opt.subject_key = make_certs_path(csp->config->certificate_directory,
1768 (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
1769 if (cert_opt.subject_key == NULL)
1771 freez(cert_opt.output_file);
1775 if (enforce_sane_certificate_state(cert_opt.output_file,
1776 cert_opt.subject_key))
1778 freez(cert_opt.output_file);
1779 freez(cert_opt.subject_key);
1784 if (file_exists(cert_opt.output_file) == 1)
1786 /* The file exists, but is it valid? */
1787 if (ssl_certificate_is_invalid(cert_opt.output_file))
1789 log_error(LOG_LEVEL_CONNECT,
1790 "Certificate %s is no longer valid. Removing it.",
1791 cert_opt.output_file);
1792 if (unlink(cert_opt.output_file))
1794 log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
1795 cert_opt.output_file);
1797 freez(cert_opt.output_file);
1798 freez(cert_opt.subject_key);
1802 if (unlink(cert_opt.subject_key))
1804 log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
1805 cert_opt.subject_key);
1807 freez(cert_opt.output_file);
1808 freez(cert_opt.subject_key);
1815 freez(cert_opt.output_file);
1816 freez(cert_opt.subject_key);
1823 * Create key for requested host
1825 int subject_key_len = generate_key(csp, &key_buf);
1826 if (subject_key_len < 0)
1828 freez(cert_opt.output_file);
1829 freez(cert_opt.subject_key);
1830 log_error(LOG_LEVEL_ERROR, "Key generating failed");
1835 * Converting unsigned long serial number to char * serial number.
1836 * We must compute length of serial number in string + terminating null.
1838 unsigned long certificate_serial = get_certificate_serial(csp);
1839 unsigned long certificate_serial_time = (unsigned long)time(NULL);
1840 int serial_num_size = snprintf(NULL, 0, "%lu%lu",
1841 certificate_serial_time, certificate_serial) + 1;
1842 if (serial_num_size <= 0)
1844 serial_num_size = 1;
1847 char serial_num_text[serial_num_size]; /* Buffer for serial number */
1848 ret = snprintf(serial_num_text, (size_t)serial_num_size, "%lu%lu",
1849 certificate_serial_time, certificate_serial);
1850 if (ret < 0 || ret >= serial_num_size)
1852 log_error(LOG_LEVEL_ERROR,
1853 "Converting certificate serial number into string failed");
1859 * Preparing parameters for certificate
1861 subject_name = X509_NAME_new();
1864 log_ssl_errors(LOG_LEVEL_ERROR, "X509 memory allocation failure");
1869 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_COMMON_NAME_FCODE,
1870 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1872 log_ssl_errors(LOG_LEVEL_ERROR,
1873 "X509 subject name (code: %s, val: %s) error",
1874 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1878 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_ORGANIZATION_FCODE,
1879 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1881 log_ssl_errors(LOG_LEVEL_ERROR,
1882 "X509 subject name (code: %s, val: %s) error",
1883 CERT_PARAM_ORGANIZATION_FCODE, csp->http->host);
1887 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_ORG_UNIT_FCODE,
1888 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1890 log_ssl_errors(LOG_LEVEL_ERROR,
1891 "X509 subject name (code: %s, val: %s) error",
1892 CERT_PARAM_ORG_UNIT_FCODE, csp->http->host);
1896 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_COUNTRY_FCODE,
1897 MBSTRING_ASC, (void *)CERT_PARAM_COUNTRY_CODE, -1, -1, 0))
1899 log_ssl_errors(LOG_LEVEL_ERROR,
1900 "X509 subject name (code: %s, val: %s) error",
1901 CERT_PARAM_COUNTRY_FCODE, CERT_PARAM_COUNTRY_CODE);
1906 cert_opt.issuer_crt = csp->config->ca_cert_file;
1907 cert_opt.issuer_key = csp->config->ca_key_file;
1909 if (get_certificate_valid_from_date(cert_valid_from,
1910 sizeof(cert_valid_from), VALID_DATETIME_FMT)
1911 || get_certificate_valid_to_date(cert_valid_to,
1912 sizeof(cert_valid_to), VALID_DATETIME_FMT))
1914 log_error(LOG_LEVEL_ERROR, "Generating one of the validity dates failed");
1919 cert_opt.subject_pwd = CERT_SUBJECT_PASSWORD;
1920 cert_opt.issuer_pwd = csp->config->ca_password;
1921 cert_opt.not_before = cert_valid_from;
1922 cert_opt.not_after = cert_valid_to;
1923 cert_opt.serial = serial_num_text;
1924 cert_opt.max_pathlen = -1;
1927 * Test if the private key was already created.
1928 * XXX: Can this still happen?
1930 if (subject_key_len == 0)
1932 log_error(LOG_LEVEL_ERROR, "Subject key was already created");
1938 * Parse serial to MPI
1940 serial_num = BN_new();
1943 log_error(LOG_LEVEL_ERROR, "generate_host_certificate: memory error");
1947 if (!BN_dec2bn(&serial_num, cert_opt.serial))
1949 log_ssl_errors(LOG_LEVEL_ERROR, "Failed to parse serial %s", cert_opt.serial);
1954 if (!(serial = BN_to_ASN1_INTEGER(serial_num, NULL)))
1956 log_ssl_errors(LOG_LEVEL_ERROR, "Failed to generate serial ASN1 representation");
1962 * Loading certificates
1964 if (!(issuer_cert = ssl_certificate_load(cert_opt.issuer_crt)))
1966 log_error(LOG_LEVEL_ERROR, "Loading issuer certificate %s failed",
1967 cert_opt.issuer_crt);
1972 issuer_name = X509_get_issuer_name(issuer_cert);
1975 * Loading keys from file or from buffer
1977 if (key_buf != NULL && subject_key_len > 0)
1979 pk_bio = BIO_new_mem_buf(key_buf, subject_key_len);
1981 else if (!(pk_bio = BIO_new_file(cert_opt.subject_key, "r")))
1983 log_ssl_errors(LOG_LEVEL_ERROR,
1984 "Failure opening subject key %s BIO", cert_opt.subject_key);
1989 loaded_subject_key = PEM_read_bio_PrivateKey(pk_bio, NULL, NULL,
1990 (void *)cert_opt.subject_pwd);
1991 if (!loaded_subject_key)
1993 log_ssl_errors(LOG_LEVEL_ERROR, "Parsing subject key %s failed",
1994 cert_opt.subject_key);
1999 if (!BIO_free(pk_bio))
2001 log_ssl_errors(LOG_LEVEL_ERROR, "Error closing subject key BIO");
2004 if (!(pk_bio = BIO_new_file(cert_opt.issuer_key, "r")))
2006 log_ssl_errors(LOG_LEVEL_ERROR, "Failure opening issuer key %s BIO",
2007 cert_opt.issuer_key);
2012 loaded_issuer_key = PEM_read_bio_PrivateKey(pk_bio, NULL, NULL,
2013 (void *)cert_opt.issuer_pwd);
2014 if (!loaded_issuer_key)
2016 log_ssl_errors(LOG_LEVEL_ERROR, "Parsing issuer key %s failed",
2017 cert_opt.subject_key);
2025 log_ssl_errors(LOG_LEVEL_ERROR, "Certificate allocation error");
2030 if (!X509_set_version(cert, CERTIFICATE_VERSION))
2032 log_ssl_errors(LOG_LEVEL_ERROR, "X509_set_version failed");
2038 * Setting parameters of signed certificate
2040 if (!X509_set_pubkey(cert, loaded_subject_key))
2042 log_ssl_errors(LOG_LEVEL_ERROR,
2043 "Setting public key in signed certificate failed");
2048 if (!X509_set_subject_name(cert, subject_name))
2050 log_ssl_errors(LOG_LEVEL_ERROR,
2051 "Setting subject name in signed certificate failed");
2056 if (!X509_set_issuer_name(cert, issuer_name))
2058 log_ssl_errors(LOG_LEVEL_ERROR,
2059 "Setting issuer name in signed certificate failed");
2064 if (!X509_set_serialNumber(cert, serial))
2066 log_ssl_errors(LOG_LEVEL_ERROR,
2067 "Setting serial number in signed certificate failed");
2072 asn_time = ASN1_TIME_new();
2075 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time memory allocation failure");
2080 if (!ASN1_TIME_set_string(asn_time, cert_opt.not_after))
2082 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time [%s] encode error", cert_opt.not_after);
2087 if (!X509_set1_notAfter(cert, asn_time))
2089 log_ssl_errors(LOG_LEVEL_ERROR,
2090 "Setting valid not after in signed certificate failed");
2095 if (!ASN1_TIME_set_string(asn_time, cert_opt.not_before))
2097 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time encode error");
2102 if (!X509_set1_notBefore(cert, asn_time))
2104 log_ssl_errors(LOG_LEVEL_ERROR,
2105 "Setting valid not before in signed certificate failed");
2110 if (!set_x509_ext(cert, issuer_cert, NID_basic_constraints, CERTIFICATE_BASIC_CONSTRAINTS))
2112 log_ssl_errors(LOG_LEVEL_ERROR, "Setting the basicConstraints extension "
2113 "in signed certificate failed");
2118 if (!set_x509_ext(cert, issuer_cert, NID_subject_key_identifier, CERTIFICATE_SUBJECT_KEY))
2120 log_ssl_errors(LOG_LEVEL_ERROR,
2121 "Setting the Subject Key Identifier extension failed");
2126 if (!set_x509_ext(cert, issuer_cert, NID_authority_key_identifier, CERTIFICATE_AUTHORITY_KEY))
2128 log_ssl_errors(LOG_LEVEL_ERROR,
2129 "Setting the Authority Key Identifier extension failed");
2134 if (!host_is_ip_address(csp->http->host) &&
2135 !set_subject_alternative_name(cert, issuer_cert, csp->http->host))
2137 log_ssl_errors(LOG_LEVEL_ERROR,
2138 "Setting the Subject Alt Name extension failed");
2143 if (!X509_sign(cert, loaded_issuer_key, EVP_sha256()))
2145 log_ssl_errors(LOG_LEVEL_ERROR, "Signing certificate failed");
2151 * Writing certificate into file
2153 if (write_certificate(cert, cert_opt.output_file) < 0)
2155 log_error(LOG_LEVEL_ERROR, "Writing certificate into file failed");
2164 * Freeing used structures
2168 X509_free(issuer_cert);
2174 if (pk_bio && !BIO_free(pk_bio))
2176 log_ssl_errors(LOG_LEVEL_ERROR, "Error closing pk BIO");
2178 if (loaded_subject_key)
2180 EVP_PKEY_free(loaded_subject_key);
2182 if (loaded_issuer_key)
2184 EVP_PKEY_free(loaded_issuer_key);
2188 X509_NAME_free(subject_name);
2192 ASN1_TIME_free(asn_time);
2196 BN_free(serial_num);
2200 ASN1_INTEGER_free(serial);
2202 freez(cert_opt.subject_key);
2203 freez(cert_opt.output_file);
2210 /*********************************************************************
2212 * Function : ssl_crt_verify_info
2214 * Description : Returns an informational string about the verification
2215 * status of a certificate.
2218 * 1 : buf = Buffer to write to
2219 * 2 : size = Maximum size of buffer
2220 * 3 : csp = client state
2224 *********************************************************************/
2225 extern void ssl_crt_verify_info(char *buf, size_t size, struct client_state *csp)
2227 strncpy(buf, X509_verify_cert_error_string(csp->server_cert_verification_result), size);
2232 #ifdef FEATURE_GRACEFUL_TERMINATION
2233 /*********************************************************************
2235 * Function : ssl_release
2237 * Description : Release all SSL resources
2243 *********************************************************************/
2244 extern void ssl_release(void)
2246 if (ssl_inited == 1)
2248 #if OPENSSL_VERSION_NUMBER >= 0x1000200fL
2249 #ifndef LIBRESSL_VERSION_NUMBER
2250 #ifndef OPENSSL_NO_COMP
2251 SSL_COMP_free_compression_methods();
2255 CONF_modules_free();
2256 CONF_modules_unload(1);
2257 #ifndef OPENSSL_NO_COMP
2258 COMP_zlib_cleanup();
2264 CRYPTO_cleanup_all_ex_data();
2267 #endif /* def FEATURE_GRACEFUL_TERMINATION */