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.
8 * Copyright : Written by and Copyright (c) 2020 Maxim Antonov <mantonov@gmail.com>
9 * Copyright (C) 2017 Vaclav Svec. FIT CVUT.
10 * Copyright (C) 2018-2020 by Fabian Keil <fk@fabiankeil.de>
12 * This program is free software; you can redistribute it
13 * and/or modify it under the terms of the GNU General
14 * Public License as published by the Free Software
15 * Foundation; either version 2 of the License, or (at
16 * your option) any later version.
18 * This program is distributed in the hope that it will
19 * be useful, but WITHOUT ANY WARRANTY; without even the
20 * implied warranty of MERCHANTABILITY or FITNESS FOR A
21 * PARTICULAR PURPOSE. See the GNU General Public
22 * License for more details.
24 * The GNU General Public License should be included with
25 * this file. If not, you can view it at
26 * http://www.gnu.org/copyleft/gpl.html
27 * or write to the Free Software Foundation, Inc., 59
28 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
30 *********************************************************************/
35 #include <openssl/bn.h>
36 #include <openssl/opensslv.h>
37 #include <openssl/pem.h>
38 #include <openssl/md5.h>
39 #include <openssl/x509v3.h>
48 #include "ssl_common.h"
51 * Macros for openssl.c
53 #define CERTIFICATE_BASIC_CONSTRAINTS "CA:FALSE"
54 #define CERTIFICATE_SUBJECT_KEY "hash"
55 #define CERTIFICATE_AUTHORITY_KEY "keyid:always"
56 #define CERTIFICATE_ALT_NAME_PREFIX "DNS:"
57 #define CERTIFICATE_VERSION 2
58 #define VALID_DATETIME_FMT "%Y%m%d%H%M%SZ"
59 #define VALID_DATETIME_BUFLEN 16
61 static int generate_webpage_certificate(struct client_state *csp);
62 static void free_client_ssl_structures(struct client_state *csp);
63 static void free_server_ssl_structures(struct client_state *csp);
64 static int ssl_store_cert(struct client_state *csp, X509* crt);
65 static void log_ssl_errors(int debuglevel, const char* fmt, ...) __attribute__((format(printf, 2, 3)));
67 static int ssl_inited = 0;
69 #if OPENSSL_VERSION_NUMBER < 0x10100000L
70 #define X509_set1_notBefore X509_set_notBefore
71 #define X509_set1_notAfter X509_set_notAfter
72 #define X509_get0_serialNumber X509_get_serialNumber
73 #define X509_get0_notBefore X509_get_notBefore
74 #define X509_get0_notAfter X509_get_notAfter
77 /*********************************************************************
79 * Function : openssl_init
81 * Description : Initializes OpenSSL library once
87 *********************************************************************/
88 static void openssl_init(void)
92 privoxy_mutex_lock(&ssl_init_mutex);
95 #if OPENSSL_VERSION_NUMBER < 0x10100000L
98 OPENSSL_init_ssl(0, NULL);
100 SSL_load_error_strings();
101 OpenSSL_add_ssl_algorithms();
104 privoxy_mutex_unlock(&ssl_init_mutex);
109 /*********************************************************************
111 * Function : is_ssl_pending
113 * Description : Tests if there are some waiting data on ssl connection.
114 * Only considers data that has actually been received
115 * locally and ignores data that is still on the fly
116 * or has not yet been sent by the remote end.
119 * 1 : ssl_attr = SSL context to test
121 * Returns : 0 => No data are pending
122 * >0 => Pending data length
124 *********************************************************************/
125 extern size_t is_ssl_pending(struct ssl_attr *ssl_attr)
127 BIO *bio = ssl_attr->openssl_attr.bio;
133 return (size_t)BIO_pending(bio);
137 /*********************************************************************
139 * Function : ssl_send_data
141 * Description : Sends the content of buf (for n bytes) to given SSL
142 * connection context.
145 * 1 : ssl_attr = SSL context to send data to
146 * 2 : buf = Pointer to data to be sent
147 * 3 : len = Length of data to be sent to the SSL context
149 * Returns : Length of sent data or negative value on error.
151 *********************************************************************/
152 extern int ssl_send_data(struct ssl_attr *ssl_attr, const unsigned char *buf, size_t len)
154 BIO *bio = ssl_attr->openssl_attr.bio;
156 int pos = 0; /* Position of unsent part in buffer */
165 int send_len = (int)len - pos;
167 log_error(LOG_LEVEL_WRITING, "TLS: %N", send_len, buf+pos);
170 * Sending one part of the buffer
172 while ((ret = BIO_write(bio,
173 (const unsigned char *)(buf + pos),
176 if (!BIO_should_retry(bio))
178 log_ssl_errors(LOG_LEVEL_ERROR,
179 "Sending data over TLS/SSL failed");
183 /* Adding count of sent bytes to position in buffer */
191 /*********************************************************************
193 * Function : ssl_recv_data
195 * Description : Receives data from given SSL context and puts
199 * 1 : ssl_attr = SSL context to receive data from
200 * 2 : buf = Pointer to buffer where data will be written
201 * 3 : max_length = Maximum number of bytes to read
203 * Returns : Number of bytes read, 0 for EOF, or -1
206 *********************************************************************/
207 extern int ssl_recv_data(struct ssl_attr *ssl_attr, unsigned char *buf, size_t max_length)
209 BIO *bio = ssl_attr->openssl_attr.bio;
211 memset(buf, 0, max_length);
214 * Receiving data from SSL context into buffer
218 ret = BIO_read(bio, buf, (int)max_length);
219 } while (ret <= 0 && BIO_should_retry(bio));
223 log_ssl_errors(LOG_LEVEL_ERROR,
224 "Receiving data over TLS/SSL failed");
229 log_error(LOG_LEVEL_RECEIVED, "TLS: %N", ret, buf);
235 /*********************************************************************
237 * Function : ssl_store_cert
239 * Description : This function is called once for each certificate in the
240 * server's certificate trusted chain and prepares
241 * information about the certificate. The information can
242 * be used to inform the user about invalid certificates.
245 * 1 : csp = Current client state (buffers, headers, etc...)
246 * 2 : crt = certificate from trusted chain
248 * Returns : 0 on success and negative value on error
250 *********************************************************************/
251 static int ssl_store_cert(struct client_state *csp, X509* crt)
254 struct certs_chain *last = &(csp->server_certs_chain);
256 BIO *bio = BIO_new(BIO_s_mem());
257 EVP_PKEY *pkey = NULL;
258 char *bio_mem_data = 0;
261 const ASN1_INTEGER *bs;
262 #if OPENSSL_VERSION_NUMBER > 0x10100000L
263 const X509_ALGOR *tsig_alg;
269 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new_mem_buf() failed");
274 * Searching for last item in certificates linked list
276 while (last->next != NULL)
282 * Preparing next item in linked list for next certificate
284 last->next = malloc_or_die(sizeof(struct certs_chain));
285 last->next->next = NULL;
286 memset(last->next->info_buf, 0, sizeof(last->next->info_buf));
287 memset(last->next->file_buf, 0, sizeof(last->next->file_buf));
290 * Saving certificate file into buffer
292 if (!PEM_write_bio_X509(bio, crt))
294 log_ssl_errors(LOG_LEVEL_ERROR, "PEM_write_X509() failed");
299 len = BIO_get_mem_data(bio, &bio_mem_data);
301 if (len > (sizeof(last->file_buf) - 1))
303 log_error(LOG_LEVEL_ERROR,
304 "X509 PEM cert len %ld is larger than buffer len %lu",
305 len, sizeof(last->file_buf) - 1);
306 len = sizeof(last->file_buf) - 1;
309 strncpy(last->file_buf, bio_mem_data, (size_t)len);
311 bio = BIO_new(BIO_s_mem());
314 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new_mem_buf() failed");
320 * Saving certificate information into buffer
322 l = X509_get_version(crt);
323 if (l >= 0 && l <= 2)
325 if (BIO_printf(bio, "cert. version : %ld\n", l + 1) <= 0)
327 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for version failed");
334 if (BIO_printf(bio, "cert. version : Unknown (%ld)\n", l) <= 0)
336 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for version failed");
342 if (BIO_puts(bio, "serial number : ") <= 0)
344 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for serial failed");
348 bs = X509_get0_serialNumber(crt);
349 if (bs->length <= (int)sizeof(long))
352 l = ASN1_INTEGER_get(bs);
363 if (bs->type == V_ASN1_NEG_INTEGER)
365 ul = 0 - (unsigned long)l;
370 ul = (unsigned long)l;
373 if (BIO_printf(bio, " %s%lu (%s0x%lx)\n", neg, ul, neg, ul) <= 0)
375 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for serial failed");
382 if (bs->type == V_ASN1_NEG_INTEGER)
384 if (BIO_puts(bio, " (Negative)") < 0)
386 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for serial failed");
391 for (int i = 0; i < bs->length; i++)
393 if (BIO_printf(bio, "%02x%c", bs->data[i],
394 ((i + 1 == bs->length) ? '\n' : ':')) <= 0)
396 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for serial failed");
403 if (BIO_puts(bio, "issuer name : ") <= 0)
405 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for issuer failed");
409 if (X509_NAME_print_ex(bio, X509_get_issuer_name(crt), 0, 0) < 0)
411 log_ssl_errors(LOG_LEVEL_ERROR, "X509_NAME_print_ex() for issuer failed");
416 if (BIO_puts(bio, "\nsubject name : ") <= 0)
418 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for subject failed");
422 if (X509_NAME_print_ex(bio, X509_get_subject_name(crt), 0, 0) < 0) {
423 log_ssl_errors(LOG_LEVEL_ERROR, "X509_NAME_print_ex() for subject failed");
428 if (BIO_puts(bio, "\nissued on : ") <= 0)
430 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for issued on failed");
434 if (!ASN1_TIME_print(bio, X509_get0_notBefore(crt)))
436 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_TIME_print() for issued on failed");
441 if (BIO_puts(bio, "\nexpires on : ") <= 0)
443 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for expires on failed");
447 if (!ASN1_TIME_print(bio, X509_get0_notAfter(crt)))
449 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_TIME_print() for expires on failed");
454 #if OPENSSL_VERSION_NUMBER > 0x10100000L
455 if (BIO_puts(bio, "\nsigned using : ") <= 0)
457 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for signed using failed");
461 tsig_alg = X509_get0_tbs_sigalg(crt);
462 if (!i2a_ASN1_OBJECT(bio, tsig_alg->algorithm))
464 log_ssl_errors(LOG_LEVEL_ERROR, "i2a_ASN1_OBJECT() for signed using failed");
469 pkey = X509_get_pubkey(crt);
472 log_ssl_errors(LOG_LEVEL_ERROR, "X509_get_pubkey() failed");
477 switch (EVP_PKEY_base_id(pkey))
480 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "RSA key size", EVP_PKEY_bits(pkey));
483 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "DSA key size", EVP_PKEY_bits(pkey));
486 ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "non-RSA/DSA key size", EVP_PKEY_bits(pkey));
491 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for key size failed");
496 loc = X509_get_ext_by_NID(crt, NID_basic_constraints, -1);
499 X509_EXTENSION *ex = X509_get_ext(crt, loc);
500 if (BIO_puts(bio, "\nbasic constraints : ") <= 0)
502 log_ssl_errors(LOG_LEVEL_ERROR,
503 "BIO_printf() for basic constraints failed");
507 if (!X509V3_EXT_print(bio, ex, 0, 0))
509 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex), ASN1_STRFLGS_RFC2253))
511 log_ssl_errors(LOG_LEVEL_ERROR,
512 "ASN1_STRING_print_ex() for basic constraints failed");
519 loc = X509_get_ext_by_NID(crt, NID_subject_alt_name, -1);
522 X509_EXTENSION *ex = X509_get_ext(crt, loc);
523 if (BIO_puts(bio, "\nsubject alt name : ") <= 0)
525 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for alt name failed");
529 if (!X509V3_EXT_print(bio, ex, 0, 0))
531 if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex),
532 ASN1_STRFLGS_RFC2253))
534 log_ssl_errors(LOG_LEVEL_ERROR,
535 "ASN1_STRING_print_ex() for alt name failed");
542 loc = X509_get_ext_by_NID(crt, NID_netscape_cert_type, -1);
545 X509_EXTENSION *ex = X509_get_ext(crt, loc);
546 if (BIO_puts(bio, "\ncert. type : ") <= 0)
548 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for cert type 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 cert type failed");
565 loc = X509_get_ext_by_NID(crt, NID_key_usage, -1);
568 X509_EXTENSION *ex = X509_get_ext(crt, loc);
569 if (BIO_puts(bio, "\nkey usage : ") <= 0)
571 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for key usage 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 key usage failed");
588 loc = X509_get_ext_by_NID(crt, NID_ext_key_usage, -1);
590 X509_EXTENSION *ex = X509_get_ext(crt, loc);
591 if (BIO_puts(bio, "\next key usage : ") <= 0)
593 log_ssl_errors(LOG_LEVEL_ERROR,
594 "BIO_printf() for ext 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 ext key usage failed");
611 loc = X509_get_ext_by_NID(crt, NID_certificate_policies, -1);
614 X509_EXTENSION *ex = X509_get_ext(crt, loc);
615 if (BIO_puts(bio, "\ncertificate policies : ") <= 0)
617 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for certificate policies 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 certificate policies failed");
634 /* make valgrind happy */
635 static const char zero = 0;
636 BIO_write(bio, &zero, 1);
638 len = BIO_get_mem_data(bio, &bio_mem_data);
639 encoded_text = html_encode(bio_mem_data);
640 if (encoded_text == NULL)
642 log_error(LOG_LEVEL_ERROR,
643 "Failed to HTML-encode the certificate information");
648 strlcpy(last->info_buf, encoded_text, sizeof(last->info_buf));
665 /*********************************************************************
667 * Function : host_to_hash
669 * Description : Creates MD5 hash from host name. Host name is loaded
670 * from structure csp and saved again into it.
673 * 1 : csp = Current client state (buffers, headers, etc...)
675 * Returns : 1 => Error while creating hash
676 * 0 => Hash created successfully
678 *********************************************************************/
679 static int host_to_hash(struct client_state *csp)
683 memset(csp->http->hash_of_host, 0, sizeof(csp->http->hash_of_host));
684 MD5((unsigned char *)csp->http->host, strlen(csp->http->host),
685 csp->http->hash_of_host);
687 /* Converting hash into string with hex */
691 if ((ret = sprintf((char *)csp->http->hash_of_host_hex + 2 * i, "%02x",
692 csp->http->hash_of_host[i])) < 0)
694 log_error(LOG_LEVEL_ERROR, "Sprintf return value: %d", ret);
703 /*********************************************************************
705 * Function : create_client_ssl_connection
707 * Description : Creates TLS/SSL secured connection with client
710 * 1 : csp = Current client state (buffers, headers, etc...)
712 * Returns : 0 on success, negative value if connection wasn't created
715 *********************************************************************/
716 extern int create_client_ssl_connection(struct client_state *csp)
718 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
719 /* Paths to certificates file and key file */
720 char *key_file = NULL;
721 char *ca_file = NULL;
722 char *cert_file = NULL;
727 * Initializing OpenSSL structures for TLS/SSL connection
732 * Preparing hash of host for creating certificates
734 ret = host_to_hash(csp);
737 log_error(LOG_LEVEL_ERROR, "Generating hash of host failed: %d", ret);
743 * Preparing paths to certificates files and key file
745 ca_file = csp->config->ca_cert_file;
746 cert_file = make_certs_path(csp->config->certificate_directory,
747 (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
748 key_file = make_certs_path(csp->config->certificate_directory,
749 (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
751 if (cert_file == NULL || key_file == NULL)
758 * Generating certificate for requested host. Mutex to prevent
759 * certificate and key inconsistence must be locked.
761 privoxy_mutex_lock(&certificate_mutex);
763 ret = generate_webpage_certificate(csp);
766 log_error(LOG_LEVEL_ERROR,
767 "Generate_webpage_certificate failed: %d", ret);
768 privoxy_mutex_unlock(&certificate_mutex);
772 privoxy_mutex_unlock(&certificate_mutex);
774 if (!(ssl_attr->openssl_attr.ctx = SSL_CTX_new(SSLv23_server_method())))
776 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create SSL context");
781 /* Set the key and cert */
782 if (SSL_CTX_use_certificate_file(ssl_attr->openssl_attr.ctx,
783 cert_file, SSL_FILETYPE_PEM) != 1)
785 log_ssl_errors(LOG_LEVEL_ERROR,
786 "Loading webpage certificate %s failed", cert_file);
791 if (SSL_CTX_use_PrivateKey_file(ssl_attr->openssl_attr.ctx,
792 key_file, SSL_FILETYPE_PEM) != 1)
794 log_ssl_errors(LOG_LEVEL_ERROR,
795 "Loading webpage certificate private key %s failed", key_file);
800 SSL_CTX_set_options(ssl_attr->openssl_attr.ctx, SSL_OP_NO_SSLv3);
802 if (!(ssl_attr->openssl_attr.bio = BIO_new_ssl(ssl_attr->openssl_attr.ctx, 0)))
804 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create BIO structure");
809 if (BIO_get_ssl(ssl_attr->openssl_attr.bio, &ssl) != 1)
811 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_get_ssl failed");
816 if (!SSL_set_fd(ssl, csp->cfd))
818 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_fd failed");
824 * Handshake with client
826 log_error(LOG_LEVEL_CONNECT,
827 "Performing the TLS/SSL handshake with client. Hash of host: %s",
828 csp->http->hash_of_host_hex);
829 if (BIO_do_handshake(ssl_attr->openssl_attr.bio) != 1)
831 log_ssl_errors(LOG_LEVEL_ERROR,
832 "The TLS/SSL handshake with the client failed");
837 log_error(LOG_LEVEL_CONNECT, "Client successfully connected over TLS/SSL");
838 csp->ssl_with_client_is_opened = 1;
843 * Freeing allocated paths to files
848 /* Freeing structures if connection wasn't created successfully */
851 free_client_ssl_structures(csp);
857 /*********************************************************************
859 * Function : close_client_ssl_connection
861 * Description : Closes TLS/SSL connection with client. This function
862 * checks if this connection is already created.
865 * 1 : csp = Current client state (buffers, headers, etc...)
869 *********************************************************************/
870 extern void close_client_ssl_connection(struct client_state *csp)
872 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
875 if (csp->ssl_with_client_is_opened == 0)
881 * Notifying the peer that the connection is being closed.
883 BIO_ssl_shutdown(ssl_attr->openssl_attr.bio);
884 if (BIO_get_ssl(ssl_attr->openssl_attr.bio, &ssl) != 1)
886 log_ssl_errors(LOG_LEVEL_ERROR,
887 "BIO_get_ssl() failed in close_client_ssl_connection()");
892 * Pretend we received a shutdown alert so
893 * the BIO_free_all() call later on returns
896 SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);
898 free_client_ssl_structures(csp);
899 csp->ssl_with_client_is_opened = 0;
903 /*********************************************************************
905 * Function : free_client_ssl_structures
907 * Description : Frees structures used for SSL communication with
911 * 1 : csp = Current client state (buffers, headers, etc...)
915 *********************************************************************/
916 static void free_client_ssl_structures(struct client_state *csp)
918 struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
920 if (ssl_attr->openssl_attr.bio)
922 BIO_free_all(ssl_attr->openssl_attr.bio);
924 if (ssl_attr->openssl_attr.ctx)
926 SSL_CTX_free(ssl_attr->openssl_attr.ctx);
931 /*********************************************************************
933 * Function : close_server_ssl_connection
935 * Description : Closes TLS/SSL connection with server. This function
936 * checks if this connection is already opened.
939 * 1 : csp = Current client state (buffers, headers, etc...)
943 *********************************************************************/
944 extern void close_server_ssl_connection(struct client_state *csp)
946 struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
949 if (csp->ssl_with_server_is_opened == 0)
955 * Notifying the peer that the connection is being closed.
957 BIO_ssl_shutdown(ssl_attr->openssl_attr.bio);
958 if (BIO_get_ssl(ssl_attr->openssl_attr.bio, &ssl) != 1)
960 log_ssl_errors(LOG_LEVEL_ERROR,
961 "BIO_get_ssl() failed in close_server_ssl_connection()");
966 * Pretend we received a shutdown alert so
967 * the BIO_free_all() call later on returns
970 SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);
972 free_server_ssl_structures(csp);
973 csp->ssl_with_server_is_opened = 0;
977 /*********************************************************************
979 * Function : create_server_ssl_connection
981 * Description : Creates TLS/SSL secured connection with server.
984 * 1 : csp = Current client state (buffers, headers, etc...)
986 * Returns : 0 on success, negative value if connection wasn't created
989 *********************************************************************/
990 extern int create_server_ssl_connection(struct client_state *csp)
992 openssl_connection_attr *ssl_attrs = &csp->ssl_server_attr.openssl_attr;
994 char *trusted_cas_file = NULL;
995 STACK_OF(X509) *chain;
998 csp->server_cert_verification_result = SSL_CERT_NOT_VERIFIED;
999 csp->server_certs_chain.next = NULL;
1001 /* Setting path to file with trusted CAs */
1002 trusted_cas_file = csp->config->trusted_cas_file;
1004 ssl_attrs->ctx = SSL_CTX_new(SSLv23_method());
1005 if (!ssl_attrs->ctx)
1007 log_ssl_errors(LOG_LEVEL_ERROR, "SSL context creation failed");
1013 * Loading file with trusted CAs
1015 if (!SSL_CTX_load_verify_locations(ssl_attrs->ctx, trusted_cas_file, NULL))
1017 log_ssl_errors(LOG_LEVEL_ERROR, "Loading trusted CAs file %s failed",
1023 SSL_CTX_set_verify(ssl_attrs->ctx, SSL_VERIFY_NONE, NULL);
1024 SSL_CTX_set_options(ssl_attrs->ctx, SSL_OP_NO_SSLv3);
1026 if (!(ssl_attrs->bio = BIO_new_ssl(ssl_attrs->ctx, 1)))
1028 log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create BIO structure");
1033 if (BIO_get_ssl(ssl_attrs->bio, &ssl) != 1)
1035 log_ssl_errors(LOG_LEVEL_ERROR, "BIO_get_ssl failed");
1040 if (!SSL_set_fd(ssl, csp->server_connection.sfd))
1042 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_fd failed");
1048 * Set the hostname to check against the received server certificate
1050 #if OPENSSL_VERSION_NUMBER > 0x10100000L
1051 if (!SSL_set1_host(ssl, csp->http->host))
1053 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set1_host failed");
1058 if (host_is_ip_address(csp->http->host))
1060 if (X509_VERIFY_PARAM_set1_ip_asc(ssl->param, csp->http->host) != 1)
1062 log_ssl_errors(LOG_LEVEL_ERROR,
1063 "X509_VERIFY_PARAM_set1_ip_asc() failed");
1070 if (X509_VERIFY_PARAM_set1_host(ssl->param, csp->http->host, 0) != 1)
1072 log_ssl_errors(LOG_LEVEL_ERROR,
1073 "X509_VERIFY_PARAM_set1_host() failed");
1080 if (!SSL_set_tlsext_host_name(ssl, csp->http->host))
1082 log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_tlsext_host_name failed");
1088 * Handshake with server
1090 log_error(LOG_LEVEL_CONNECT,
1091 "Performing the TLS/SSL handshake with the server");
1093 if (BIO_do_handshake(ssl_attrs->bio) != 1)
1095 log_ssl_errors(LOG_LEVEL_ERROR,
1096 "The TLS/SSL handshake with the server failed");
1101 chain = SSL_get_peer_cert_chain(ssl);
1104 for (int i = 0; i < sk_X509_num(chain); i++)
1106 if (ssl_store_cert(csp, sk_X509_value(chain, i)) != 0)
1108 log_error(LOG_LEVEL_ERROR, "ssl_store_cert failed");
1115 if (!csp->dont_verify_certificate)
1117 long verify_result = SSL_get_verify_result(ssl);
1118 if (verify_result == X509_V_OK)
1121 csp->server_cert_verification_result = SSL_CERT_VALID;
1125 csp->server_cert_verification_result = verify_result;
1126 log_error(LOG_LEVEL_ERROR,
1127 "X509 certificate verification for %s failed: %s",
1128 csp->http->hostport, X509_verify_cert_error_string(verify_result));
1134 log_error(LOG_LEVEL_CONNECT, "Server successfully connected over TLS/SSL");
1137 * Server certificate chain is valid, so we can clean
1138 * chain, because we will not send it to client.
1140 free_certificate_chain(csp);
1142 csp->ssl_with_server_is_opened = 1;
1144 /* Freeing structures if connection wasn't created successfully */
1147 free_server_ssl_structures(csp);
1154 /*********************************************************************
1156 * Function : free_server_ssl_structures
1158 * Description : Frees structures used for SSL communication with server
1161 * 1 : csp = Current client state (buffers, headers, etc...)
1165 *********************************************************************/
1166 static void free_server_ssl_structures(struct client_state *csp)
1168 struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
1170 if (ssl_attr->openssl_attr.bio)
1172 BIO_free_all(ssl_attr->openssl_attr.bio);
1174 if (ssl_attr->openssl_attr.ctx)
1176 SSL_CTX_free(ssl_attr->openssl_attr.ctx);
1181 /*********************************************************************
1183 * Function : log_ssl_errors
1185 * Description : Log SSL errors
1188 * 1 : debuglevel = Debug level
1189 * 2 : desc = Error description
1193 *********************************************************************/
1194 static void log_ssl_errors(int debuglevel, const char* fmt, ...)
1196 unsigned long err_code;
1197 char prefix[ERROR_BUF_SIZE];
1199 va_start(args, fmt);
1200 vsnprintf(prefix, sizeof(prefix), fmt, args);
1203 while ((err_code = ERR_get_error()))
1205 char err_buf[ERROR_BUF_SIZE];
1207 ERR_error_string_n(err_code, err_buf, sizeof(err_buf));
1208 log_error(debuglevel, "%s: %s", prefix, err_buf);
1212 * In case if called by mistake and there were
1213 * no TLS/SSL errors let's report it to the log.
1217 log_error(debuglevel, "%s: no TLS/SSL errors detected", prefix);
1222 /*********************************************************************
1224 * Function : ssl_base64_encode
1226 * Description : Encode a buffer into base64 format.
1229 * 1 : dst = Destination buffer
1230 * 2 : dlen = Destination buffer length
1231 * 3 : olen = Number of bytes written
1232 * 4 : src = Source buffer
1233 * 5 : slen = Amount of data to be encoded
1235 * Returns : 0 on success, error code othervise
1237 *********************************************************************/
1238 extern int ssl_base64_encode(unsigned char *dst, size_t dlen, size_t *olen,
1239 const unsigned char *src, size_t slen)
1241 *olen = 4 * ((slen/3) + ((slen%3) ? 1 : 0)) + 1;
1246 *olen = (size_t)EVP_EncodeBlock(dst, src, (int)slen) + 1;
1251 /*********************************************************************
1253 * Function : close_file_stream
1255 * Description : Close file stream, report error on close error
1258 * 1 : f = file stream to close
1259 * 2 : path = path for error report
1263 *********************************************************************/
1264 static void close_file_stream(FILE *f, const char *path)
1268 log_error(LOG_LEVEL_ERROR,
1269 "Error closing file %s: %s", path, strerror(errno));
1274 /*********************************************************************
1276 * Function : write_certificate
1278 * Description : Writes certificate into file.
1281 * 1 : crt = certificate to write into file
1282 * 2 : output_file = path to save certificate file
1285 * Returns : 1 on success success or negative value
1287 *********************************************************************/
1288 static int write_certificate(X509 *crt, const char *output_file)
1294 * Saving certificate into file
1296 if ((f = fopen(output_file, "w")) == NULL)
1298 log_error(LOG_LEVEL_ERROR, "Opening file %s to save certificate failed",
1303 ret = PEM_write_X509(f, crt);
1306 log_ssl_errors(LOG_LEVEL_ERROR,
1307 "Writing certificate into file %s failed", output_file);
1311 close_file_stream(f, output_file);
1316 /*********************************************************************
1318 * Function : write_private_key
1320 * Description : Writes private key into file and copies saved
1321 * content into given pointer to string. If function
1322 * returns 0 for success, this copy must be freed by
1326 * 1 : key = key to write into file
1327 * 2 : ret_buf = pointer to string with created key file content
1328 * 3 : key_file_path = path where to save key file
1330 * Returns : Length of written private key on success or negative value
1333 *********************************************************************/
1334 static int write_private_key(EVP_PKEY *key, char **ret_buf,
1335 const char *key_file_path)
1337 size_t len = 0; /* Length of created key */
1338 FILE *f = NULL; /* File to save certificate */
1340 BIO *bio_mem = BIO_new(BIO_s_mem());
1341 char *bio_mem_data = 0;
1343 if (bio_mem == NULL)
1345 log_ssl_errors(LOG_LEVEL_ERROR, "write_private_key memory allocation failure");
1350 * Writing private key into PEM string
1352 if (!PEM_write_bio_PrivateKey(bio_mem, key, NULL, NULL, 0, NULL, NULL))
1354 log_ssl_errors(LOG_LEVEL_ERROR,
1355 "Writing private key into PEM string failed");
1360 len = (size_t)BIO_get_mem_data(bio_mem, &bio_mem_data);
1362 /* Initializing buffer for key file content */
1363 *ret_buf = zalloc_or_die(len + 1);
1364 (*ret_buf)[len] = 0;
1366 strncpy(*ret_buf, bio_mem_data, len);
1369 * Saving key into file
1371 if ((f = fopen(key_file_path, "wb")) == NULL)
1373 log_error(LOG_LEVEL_ERROR,
1374 "Opening file %s to save private key failed: %E",
1380 if (fwrite(*ret_buf, 1, len, f) != len)
1382 log_error(LOG_LEVEL_ERROR,
1383 "Writing private key into file %s failed",
1385 close_file_stream(f, key_file_path);
1390 close_file_stream(f, key_file_path);
1404 /*********************************************************************
1406 * Function : generate_key
1408 * Description : Tests if private key for host saved in csp already
1409 * exists. If this file doesn't exists, a new key is
1410 * generated and saved in a file. The generated key is also
1411 * copied into given parameter key_buf, which must be then
1412 * freed by caller. If file with key exists, key_buf
1413 * contain NULL and no private key is generated.
1416 * 1 : csp = Current client state (buffers, headers, etc...)
1417 * 2 : key_buf = buffer to save new generated key
1419 * Returns : -1 => Error while generating private key
1420 * 0 => Key already exists
1421 * >0 => Length of generated private key
1423 *********************************************************************/
1424 static int generate_key(struct client_state *csp, char **key_buf)
1427 char* key_file_path = NULL;
1428 BIGNUM *exp = BN_new();
1429 RSA *rsa = RSA_new();
1430 EVP_PKEY *key = EVP_PKEY_new();
1432 if (exp == NULL || rsa == NULL || key == NULL)
1434 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key memory allocation failure");
1439 if (BN_set_word(exp, RSA_KEY_PUBLIC_EXPONENT) != 1)
1441 log_ssl_errors(LOG_LEVEL_ERROR, "Setting RSA key exponent failed");
1446 key_file_path = make_certs_path(csp->config->certificate_directory,
1447 (char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
1448 if (key_file_path == NULL)
1455 * Test if key already exists. If so, we don't have to create it again.
1457 if (file_exists(key_file_path) == 1)
1463 ret = RSA_generate_key_ex(rsa, RSA_KEYSIZE, exp, NULL);
1466 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key generation failure");
1471 if (!EVP_PKEY_set1_RSA(key, rsa))
1473 log_ssl_errors(LOG_LEVEL_ERROR,
1474 "Error assigning RSA key pair to PKEY structure");
1480 * Exporting private key into file
1482 if ((ret = write_private_key(key, key_buf, key_file_path)) < 0)
1484 log_error(LOG_LEVEL_ERROR,
1485 "Writing private key into file %s failed", key_file_path);
1492 * Freeing used variables
1506 freez(key_file_path);
1512 /*********************************************************************
1514 * Function : ssl_certificate_load
1516 * Description : Loads certificate from file.
1519 * 1 : cert_path = The certificate path to load
1521 * Returns : NULL => error loading certificate,
1522 * pointer to certificate instance otherwise
1524 *********************************************************************/
1525 static X509* ssl_certificate_load(const char *cert_path)
1528 FILE *cert_f = NULL;
1530 if (!(cert_f = fopen(cert_path, "r")))
1532 log_error(LOG_LEVEL_ERROR,
1533 "Error opening certificate file %s: %s", cert_path, strerror(errno));
1537 if (!(cert = PEM_read_X509(cert_f, NULL, NULL, NULL)))
1539 log_ssl_errors(LOG_LEVEL_ERROR,
1540 "Error reading certificate file %s", cert_path);
1543 close_file_stream(cert_f, cert_path);
1548 /*********************************************************************
1550 * Function : ssl_certificate_is_invalid
1552 * Description : Checks whether or not a certificate is valid.
1553 * Currently only checks that the certificate can be
1554 * parsed and that the "valid to" date is in the future.
1557 * 1 : cert_file = The certificate to check
1559 * Returns : 0 => The certificate is valid.
1560 * 1 => The certificate is invalid
1562 *********************************************************************/
1563 static int ssl_certificate_is_invalid(const char *cert_file)
1569 if (!(cert = ssl_certificate_load(cert_file)))
1571 log_ssl_errors(LOG_LEVEL_ERROR,
1572 "Error reading certificate file %s", cert_file);
1576 ret = X509_cmp_current_time(X509_get_notAfter(cert));
1579 log_ssl_errors(LOG_LEVEL_ERROR,
1580 "Error checking certificate %s validity", cert_file);
1586 return ret == -1 ? 1 : 0;
1590 /*********************************************************************
1592 * Function : set_x509_ext
1594 * Description : Sets the X509V3 extension data
1597 * 1 : cert = The certificate to modify
1598 * 2 : issuer = Issuer certificate
1599 * 3 : nid = OpenSSL NID
1600 * 4 : value = extension value
1602 * Returns : 0 => Error while setting extensuon data
1605 *********************************************************************/
1606 static int set_x509_ext(X509 *cert, X509 *issuer, int nid, char *value)
1608 X509_EXTENSION *ext = NULL;
1612 X509V3_set_ctx(&ctx, issuer, cert, NULL, NULL, 0);
1613 ext = X509V3_EXT_conf_nid(NULL, &ctx, nid, value);
1616 log_ssl_errors(LOG_LEVEL_ERROR, "X509V3_EXT_conf_nid failure");
1620 if (!X509_add_ext(cert, ext, -1))
1622 log_ssl_errors(LOG_LEVEL_ERROR, "X509_add_ext failure");
1630 X509_EXTENSION_free(ext);
1636 /*********************************************************************
1638 * Function : set_subject_alternative_name
1640 * Description : Sets the Subject Alternative Name extension to a cert
1643 * 1 : cert = The certificate to modify
1644 * 2 : issuer = Issuer certificate
1645 * 3 : hostname = The hostname to add
1647 * Returns : 0 => Error while creating certificate.
1650 *********************************************************************/
1651 static int set_subject_alternative_name(X509 *cert, X509 *issuer, const char *hostname)
1653 size_t altname_len = strlen(hostname) + sizeof(CERTIFICATE_ALT_NAME_PREFIX);
1654 char alt_name_buf[altname_len];
1656 snprintf(alt_name_buf, sizeof(alt_name_buf),
1657 CERTIFICATE_ALT_NAME_PREFIX"%s", hostname);
1658 return set_x509_ext(cert, issuer, NID_subject_alt_name, alt_name_buf);
1662 /*********************************************************************
1664 * Function : generate_webpage_certificate
1666 * Description : Creates certificate file in presetted directory.
1667 * If certificate already exists, no other certificate
1668 * will be created. Subject of certificate is named
1669 * by csp->http->host from parameter. This function also
1670 * triggers generating of private key for new certificate.
1673 * 1 : csp = Current client state (buffers, headers, etc...)
1675 * Returns : -1 => Error while creating certificate.
1676 * 0 => Certificate already exists.
1677 * 1 => Certificate created
1679 *********************************************************************/
1680 static int generate_webpage_certificate(struct client_state *csp)
1682 char *key_buf = NULL; /* Buffer for created key */
1683 X509 *issuer_cert = NULL;
1686 EVP_PKEY *loaded_subject_key = NULL;
1687 EVP_PKEY *loaded_issuer_key = NULL;
1688 X509_NAME *issuer_name;
1689 X509_NAME *subject_name = NULL;
1690 ASN1_TIME *asn_time = NULL;
1691 ASN1_INTEGER *serial = NULL;
1692 BIGNUM *serial_num = NULL;
1695 cert_options cert_opt;
1696 char cert_valid_from[VALID_DATETIME_BUFLEN];
1697 char cert_valid_to[VALID_DATETIME_BUFLEN];
1699 /* Paths to keys and certificates needed to create certificate */
1700 cert_opt.issuer_key = NULL;
1701 cert_opt.subject_key = NULL;
1702 cert_opt.issuer_crt = NULL;
1704 cert_opt.output_file = make_certs_path(csp->config->certificate_directory,
1705 (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
1706 if (cert_opt.output_file == NULL)
1711 cert_opt.subject_key = make_certs_path(csp->config->certificate_directory,
1712 (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
1713 if (cert_opt.subject_key == NULL)
1715 freez(cert_opt.output_file);
1719 if (file_exists(cert_opt.output_file) == 1)
1721 /* The file exists, but is it valid? */
1722 if (ssl_certificate_is_invalid(cert_opt.output_file))
1724 log_error(LOG_LEVEL_CONNECT,
1725 "Certificate %s is no longer valid. Removing it.",
1726 cert_opt.output_file);
1727 if (unlink(cert_opt.output_file))
1729 log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
1730 cert_opt.output_file);
1732 freez(cert_opt.output_file);
1733 freez(cert_opt.subject_key);
1737 if (unlink(cert_opt.subject_key))
1739 log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
1740 cert_opt.subject_key);
1742 freez(cert_opt.output_file);
1743 freez(cert_opt.subject_key);
1750 freez(cert_opt.output_file);
1751 freez(cert_opt.subject_key);
1758 * Create key for requested host
1760 int subject_key_len = generate_key(csp, &key_buf);
1761 if (subject_key_len < 0)
1763 freez(cert_opt.output_file);
1764 freez(cert_opt.subject_key);
1765 log_error(LOG_LEVEL_ERROR, "Key generating failed");
1770 * Converting unsigned long serial number to char * serial number.
1771 * We must compute length of serial number in string + terminating null.
1773 unsigned long certificate_serial = get_certificate_serial(csp);
1774 unsigned long certificate_serial_time = (unsigned long)time(NULL);
1775 int serial_num_size = snprintf(NULL, 0, "%lu%lu",
1776 certificate_serial_time, certificate_serial) + 1;
1777 if (serial_num_size <= 0)
1779 serial_num_size = 1;
1782 char serial_num_text[serial_num_size]; /* Buffer for serial number */
1783 ret = snprintf(serial_num_text, (size_t)serial_num_size, "%lu%lu",
1784 certificate_serial_time, certificate_serial);
1785 if (ret < 0 || ret >= serial_num_size)
1787 log_error(LOG_LEVEL_ERROR,
1788 "Converting certificate serial number into string failed");
1794 * Preparing parameters for certificate
1796 subject_name = X509_NAME_new();
1799 log_ssl_errors(LOG_LEVEL_ERROR, "RSA key memory allocation failure");
1804 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_COMMON_NAME_FCODE,
1805 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1807 log_ssl_errors(LOG_LEVEL_ERROR,
1808 "X509 subject name (code: %s, val: %s) error",
1809 CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
1813 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_ORGANIZATION_FCODE,
1814 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1816 log_ssl_errors(LOG_LEVEL_ERROR,
1817 "X509 subject name (code: %s, val: %s) error",
1818 CERT_PARAM_ORGANIZATION_FCODE, csp->http->host);
1822 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_ORG_UNIT_FCODE,
1823 MBSTRING_ASC, (void *)csp->http->host, -1, -1, 0))
1825 log_ssl_errors(LOG_LEVEL_ERROR,
1826 "X509 subject name (code: %s, val: %s) error",
1827 CERT_PARAM_ORG_UNIT_FCODE, csp->http->host);
1831 if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_COUNTRY_FCODE,
1832 MBSTRING_ASC, (void *)CERT_PARAM_COUNTRY_CODE, -1, -1, 0))
1834 log_ssl_errors(LOG_LEVEL_ERROR,
1835 "X509 subject name (code: %s, val: %s) error",
1836 CERT_PARAM_COUNTRY_FCODE, csp->http->host);
1841 cert_opt.issuer_crt = csp->config->ca_cert_file;
1842 cert_opt.issuer_key = csp->config->ca_key_file;
1844 if (get_certificate_valid_from_date(cert_valid_from,
1845 sizeof(cert_valid_from), VALID_DATETIME_FMT)
1846 || get_certificate_valid_to_date(cert_valid_to,
1847 sizeof(cert_valid_to), VALID_DATETIME_FMT))
1849 log_error(LOG_LEVEL_ERROR, "Generating one of the validity dates failed");
1854 cert_opt.subject_pwd = CERT_SUBJECT_PASSWORD;
1855 cert_opt.issuer_pwd = csp->config->ca_password;
1856 cert_opt.not_before = cert_valid_from;
1857 cert_opt.not_after = cert_valid_to;
1858 cert_opt.serial = serial_num_text;
1859 cert_opt.max_pathlen = -1;
1862 * Test if the private key was already created.
1863 * XXX: Can this still happen?
1865 if (subject_key_len == 0)
1867 log_error(LOG_LEVEL_ERROR, "Subject key was already created");
1873 * Parse serial to MPI
1875 serial_num = BN_new();
1878 log_error(LOG_LEVEL_ERROR, "generate_webpage_certificate: memory error");
1882 if (!BN_dec2bn(&serial_num, cert_opt.serial))
1884 log_ssl_errors(LOG_LEVEL_ERROR, "Failed to parse serial %s", cert_opt.serial);
1889 if (!(serial = BN_to_ASN1_INTEGER(serial_num, NULL)))
1891 log_ssl_errors(LOG_LEVEL_ERROR, "Failed to generate serial ASN1 representation");
1897 * Loading certificates
1899 if (!(issuer_cert = ssl_certificate_load(cert_opt.issuer_crt)))
1901 log_error(LOG_LEVEL_ERROR, "Loading issuer certificate %s failed",
1902 cert_opt.issuer_crt);
1907 issuer_name = X509_get_issuer_name(issuer_cert);
1910 * Loading keys from file or from buffer
1912 if (key_buf != NULL && subject_key_len > 0)
1914 pk_bio = BIO_new_mem_buf(key_buf, subject_key_len);
1916 else if (!(pk_bio = BIO_new_file(cert_opt.subject_key, "r")))
1918 log_ssl_errors(LOG_LEVEL_ERROR,
1919 "Failure opening subject key %s BIO", cert_opt.subject_key);
1924 loaded_subject_key = PEM_read_bio_PrivateKey(pk_bio, NULL, NULL,
1925 (void *)cert_opt.subject_pwd);
1926 if (!loaded_subject_key)
1928 log_ssl_errors(LOG_LEVEL_ERROR, "Parsing subject key %s failed",
1929 cert_opt.subject_key);
1934 if (!BIO_free(pk_bio))
1936 log_ssl_errors(LOG_LEVEL_ERROR, "Error closing subject key BIO");
1939 if (!(pk_bio = BIO_new_file(cert_opt.issuer_key, "r")))
1941 log_ssl_errors(LOG_LEVEL_ERROR, "Failure opening issuer key %s BIO",
1942 cert_opt.issuer_key);
1947 loaded_issuer_key = PEM_read_bio_PrivateKey(pk_bio, NULL, NULL,
1948 (void *)cert_opt.issuer_pwd);
1949 if (!loaded_issuer_key)
1951 log_ssl_errors(LOG_LEVEL_ERROR, "Parsing issuer key %s failed",
1952 cert_opt.subject_key);
1960 log_ssl_errors(LOG_LEVEL_ERROR, "Certificate allocation error");
1965 if (!X509_set_version(cert, CERTIFICATE_VERSION))
1967 log_ssl_errors(LOG_LEVEL_ERROR, "X509_set_version failed");
1973 * Setting parameters of signed certificate
1975 if (!X509_set_pubkey(cert, loaded_subject_key))
1977 log_ssl_errors(LOG_LEVEL_ERROR,
1978 "Setting public key in signed certificate failed");
1983 if (!X509_set_subject_name(cert, subject_name))
1985 log_ssl_errors(LOG_LEVEL_ERROR,
1986 "Setting subject name in signed certificate failed");
1991 if (!X509_set_issuer_name(cert, issuer_name))
1993 log_ssl_errors(LOG_LEVEL_ERROR,
1994 "Setting issuer name in signed certificate failed");
1999 if (!X509_set_serialNumber(cert, serial))
2001 log_ssl_errors(LOG_LEVEL_ERROR,
2002 "Setting serial number in signed certificate failed");
2007 asn_time = ASN1_TIME_new();
2010 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time memory allocation failure");
2015 if (!ASN1_TIME_set_string(asn_time, cert_opt.not_after))
2017 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time [%s] encode error", cert_opt.not_after);
2022 if (!X509_set1_notAfter(cert, asn_time))
2024 log_ssl_errors(LOG_LEVEL_ERROR,
2025 "Setting valid not after in signed certificate failed");
2030 if (!ASN1_TIME_set_string(asn_time, cert_opt.not_before))
2032 log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time encode error");
2037 if (!X509_set1_notBefore(cert, asn_time))
2039 log_ssl_errors(LOG_LEVEL_ERROR,
2040 "Setting valid not before in signed certificate failed");
2045 if (!set_x509_ext(cert, issuer_cert, NID_basic_constraints, CERTIFICATE_BASIC_CONSTRAINTS))
2047 log_ssl_errors(LOG_LEVEL_ERROR, "Setting the basicConstraints extension "
2048 "in signed certificate failed");
2053 if (!set_x509_ext(cert, issuer_cert, NID_subject_key_identifier, CERTIFICATE_SUBJECT_KEY))
2055 log_ssl_errors(LOG_LEVEL_ERROR,
2056 "Setting the Subject Key Identifier extension failed");
2061 if (!set_x509_ext(cert, issuer_cert, NID_authority_key_identifier, CERTIFICATE_AUTHORITY_KEY))
2063 log_ssl_errors(LOG_LEVEL_ERROR,
2064 "Setting the Authority Key Identifier extension failed");
2069 if (!host_is_ip_address(csp->http->host) &&
2070 !set_subject_alternative_name(cert, issuer_cert, csp->http->host))
2072 log_ssl_errors(LOG_LEVEL_ERROR,
2073 "Setting the Subject Alt Name extension failed");
2078 if (!X509_sign(cert, loaded_issuer_key, EVP_sha256()))
2080 log_ssl_errors(LOG_LEVEL_ERROR, "Signing certificate failed");
2086 * Writing certificate into file
2088 if (write_certificate(cert, cert_opt.output_file) < 0)
2090 log_error(LOG_LEVEL_ERROR, "Writing certificate into file failed");
2099 * Freeing used structures
2103 X509_free(issuer_cert);
2109 if (pk_bio && !BIO_free(pk_bio))
2111 log_ssl_errors(LOG_LEVEL_ERROR, "Error closing pk BIO");
2113 if (loaded_subject_key)
2115 EVP_PKEY_free(loaded_subject_key);
2117 if (loaded_issuer_key)
2119 EVP_PKEY_free(loaded_issuer_key);
2123 X509_NAME_free(subject_name);
2127 ASN1_TIME_free(asn_time);
2131 BN_free(serial_num);
2135 ASN1_INTEGER_free(serial);
2137 freez(cert_opt.subject_key);
2138 freez(cert_opt.output_file);
2145 /*********************************************************************
2147 * Function : ssl_crt_verify_info
2149 * Description : Returns an informational string about the verification
2150 * status of a certificate.
2153 * 1 : buf = Buffer to write to
2154 * 2 : size = Maximum size of buffer
2155 * 3 : csp = client state
2159 *********************************************************************/
2160 extern void ssl_crt_verify_info(char *buf, size_t size, struct client_state *csp)
2162 strncpy(buf, X509_verify_cert_error_string(csp->server_cert_verification_result), size);
2167 /*********************************************************************
2169 * Function : ssl_release
2171 * Description : Release all SSL resources
2177 *********************************************************************/
2178 extern void ssl_release(void)
2180 if (ssl_inited == 1)
2182 #ifndef OPENSSL_NO_COMP
2183 SSL_COMP_free_compression_methods();
2185 CONF_modules_free();
2186 CONF_modules_unload(1);
2187 #ifndef OPENSSL_NO_COMP
2188 COMP_zlib_cleanup();
2194 CRYPTO_cleanup_all_ex_data();