+/*********************************************************************
+ *
+ * File : $Source: $
+ *
+ * Purpose : File with TLS/SSL extension. Contains methods for
+ * creating, using and closing TLS/SSL connections.
+ *
+ * Copyright : Written by and Copyright (c) 2020 Maxim Antonov <mantonov@gmail.com>
+ *
+ * This program is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU General
+ * Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will
+ * be useful, but WITHOUT ANY WARRANTY; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. See the GNU General Public
+ * License for more details.
+ *
+ * The GNU General Public License should be included with
+ * this file. If not, you can view it at
+ * http://www.gnu.org/copyleft/gpl.html
+ * or write to the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ *********************************************************************/
+
+#include <string.h>
+#include <unistd.h>
+
+#include <openssl/bn.h>
+#include <openssl/opensslv.h>
+#include <openssl/pem.h>
+#include <openssl/md5.h>
+#include <openssl/x509v3.h>
+
+#include "config.h"
+#include "project.h"
+#include "miscutil.h"
+#include "errlog.h"
+#include "encode.h"
+#include "jcc.h"
+#include "ssl.h"
+#include "ssl_common.h"
+
+/*
+ * Macros for openssl.c
+ */
+#define CERTIFICATE_BASIC_CONSTRAINTS "CA:FALSE"
+#define CERTIFICATE_SUBJECT_KEY "hash"
+#define CERTIFICATE_AUTHORITY_KEY "keyid:always"
+#define CERTIFICATE_ALT_NAME_PREFIX "DNS:"
+#define CERTIFICATE_VERSION 2
+#define VALID_DATETIME_FMT "%Y%m%d%H%M%SZ"
+#define VALID_DATETIME_BUFLEN 16
+
+static int generate_webpage_certificate(struct client_state *csp);
+static void free_client_ssl_structures(struct client_state *csp);
+static void free_server_ssl_structures(struct client_state *csp);
+static int ssl_store_cert(struct client_state *csp, X509* crt);
+static void log_ssl_errors(int debuglevel, const char* fmt, ...) __attribute__((format(printf, 2, 3)));
+
+static int ssl_inited = 0;
+
+/*********************************************************************
+ *
+ * Function : openssl_init
+ *
+ * Description : INitializes OpenSSL library once
+ *
+ * Parameters : N/A
+ *
+ * Returns : N/A
+ *
+ *********************************************************************/
+static void openssl_init(void)
+{
+ if (ssl_inited == 0)
+ {
+ privoxy_mutex_lock(&ssl_init_mutex);
+ if (ssl_inited == 0)
+ {
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+ SSL_library_init();
+#else
+ OPENSSL_init_ssl(0, NULL);
+#endif
+ SSL_load_error_strings();
+ OpenSSL_add_ssl_algorithms();
+ ssl_inited = 1;
+ }
+ privoxy_mutex_unlock(&ssl_init_mutex);
+ }
+}
+
+
+/*********************************************************************
+ *
+ * Function : is_ssl_pending
+ *
+ * Description : Tests if there are some waiting data on ssl connection.
+ * Only considers data that has actually been received
+ * locally and ignores data that is still on the fly
+ * or has not yet been sent by the remote end.
+ *
+ * Parameters :
+ * 1 : ssl = SSL context to test
+ *
+ * Returns : 0 => No data are pending
+ * >0 => Pending data length
+ *
+ *********************************************************************/
+extern size_t is_ssl_pending(struct ssl_attr *ssl_attr)
+{
+ BIO *bio = ssl_attr->openssl_attr.bio;
+ if (bio == NULL)
+ {
+ return 0;
+ }
+
+ return (size_t)BIO_pending(bio);
+}
+
+
+/*********************************************************************
+ *
+ * Function : ssl_send_data
+ *
+ * Description : Sends the content of buf (for n bytes) to given SSL
+ * connection context.
+ *
+ * Parameters :
+ * 1 : ssl = SSL context to send data to
+ * 2 : buf = Pointer to data to be sent
+ * 3 : len = Length of data to be sent to the SSL context
+ *
+ * Returns : Length of sent data or negative value on error.
+ *
+ *********************************************************************/
+extern int ssl_send_data(struct ssl_attr *ssl_attr, const unsigned char *buf, size_t len)
+{
+ BIO *bio = ssl_attr->openssl_attr.bio;
+ int ret = 0;
+ int pos = 0; /* Position of unsent part in buffer */
+
+ if (len == 0)
+ {
+ return 0;
+ }
+
+ while (pos < len)
+ {
+ int send_len = (int)len - pos;
+
+ log_error(LOG_LEVEL_WRITING, "TLS: %N", send_len, buf+pos);
+
+ /*
+ * Sending one part of the buffer
+ */
+ while ((ret = BIO_write(bio,
+ (const unsigned char *)(buf + pos),
+ send_len)) < 0)
+ {
+ if (!BIO_should_retry(bio))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR,
+ "Sending data over TLS/SSL failed");
+ return -1;
+ }
+ }
+ /* Adding count of sent bytes to position in buffer */
+ pos = pos + ret;
+ }
+
+ return (int)len;
+}
+
+
+/*********************************************************************
+ *
+ * Function : ssl_recv_data
+ *
+ * Description : Receives data from given SSL context and puts
+ * it into buffer.
+ *
+ * Parameters :
+ * 1 : ssl = SSL context to receive data from
+ * 2 : buf = Pointer to buffer where data will be written
+ * 3 : max_length = Maximum number of bytes to read
+ *
+ * Returns : Number of bytes read, 0 for EOF, or -1
+ * on error.
+ *
+ *********************************************************************/
+extern int ssl_recv_data(struct ssl_attr *ssl_attr, unsigned char *buf, size_t max_length)
+{
+ BIO *bio = ssl_attr->openssl_attr.bio;
+ int ret = 0;
+ memset(buf, 0, max_length);
+
+ /*
+ * Receiving data from SSL context into buffer
+ */
+ do
+ {
+ ret = BIO_read(bio, buf, (int)max_length);
+ } while (ret <= 0 && BIO_should_retry(bio));
+
+ if (ret < 0)
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR,
+ "Receiving data over TLS/SSL failed");
+
+ return -1;
+ }
+
+ log_error(LOG_LEVEL_RECEIVED, "TLS: %N", ret, buf);
+
+ return ret;
+}
+
+
+/*********************************************************************
+ *
+ * Function : ssl_store_cert
+ *
+ * Description : This is a callback function for certificate verification.
+ * It's called once for each certificate in the server's
+ * certificate trusted chain and prepares information about
+ * the certificate. The information can be used to inform
+ * the user about invalid certificates.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ * 2 : crt = certificate from trusted chain
+ *
+ * Returns : 0 on success and negative value on error
+ *
+ *********************************************************************/
+static int ssl_store_cert(struct client_state *csp, X509* crt)
+{
+ long len = 0;
+ struct certs_chain *last = &(csp->server_certs_chain);
+ int ret = 0;
+ BIO *bio = BIO_new(BIO_s_mem());
+ EVP_PKEY *pkey = NULL;
+ char *bio_mem_data = 0;
+ char *encoded_text;
+ long l;
+ const ASN1_INTEGER *bs;
+ const X509_ALGOR *tsig_alg;
+ int loc;
+
+ if (!bio)
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new_mem_buf() failed");
+ return -1;
+ }
+
+ /*
+ * Searching for last item in certificates linked list
+ */
+ while (last->next != NULL)
+ {
+ last = last->next;
+ }
+
+ /*
+ * Preparing next item in linked list for next certificate
+ */
+ last->next = malloc_or_die(sizeof(struct certs_chain));
+ last->next->next = NULL;
+ memset(last->next->info_buf, 0, sizeof(last->next->info_buf));
+ memset(last->next->file_buf, 0, sizeof(last->next->file_buf));
+
+ /*
+ * Saving certificate file into buffer
+ */
+ if (!PEM_write_bio_X509(bio, crt))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "PEM_write_X509() failed");
+ ret = -1;
+ goto exit;
+ }
+
+ len = BIO_get_mem_data(bio, &bio_mem_data);
+
+ if (len > (sizeof(last->file_buf) - 1))
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "X509 PEM cert len %d is larger then buffer len %s", len, sizeof(last->file_buf) - 1);
+ len = sizeof(last->file_buf) - 1;
+ }
+
+ strncpy(last->file_buf, bio_mem_data, (size_t)len);
+ BIO_free(bio);
+ bio = BIO_new(BIO_s_mem());
+ if (!bio)
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_new_mem_buf() failed");
+ ret = -1;
+ goto exit;
+ }
+
+ /*
+ * Saving certificate information into buffer
+ */
+ l = X509_get_version(crt);
+ if (l >= 0 && l <= 2) {
+ if (BIO_printf(bio, "cert. version : %ld\n", l + 1) <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for version failed");
+ ret = -1;
+ goto exit;
+ }
+ } else {
+ if (BIO_printf(bio, "cert. version : Unknown (%ld)\n", l) <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for version failed");
+ ret = -1;
+ goto exit;
+ }
+ }
+
+ if (BIO_puts(bio, "serial number : ") <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_write() for serial failed");
+ ret = -1;
+ goto exit;
+ }
+ bs = X509_get0_serialNumber(crt);
+ if (bs->length <= (int)sizeof(long)) {
+ ERR_set_mark();
+ l = ASN1_INTEGER_get(bs);
+ ERR_pop_to_mark();
+ } else {
+ l = -1;
+ }
+ if (l != -1) {
+ unsigned long ul;
+ const char *neg;
+ if (bs->type == V_ASN1_NEG_INTEGER) {
+ ul = 0 - (unsigned long)l;
+ neg = "-";
+ } else {
+ ul = (unsigned long)l;
+ neg = "";
+ }
+ if (BIO_printf(bio, " %s%lu (%s0x%lx)\n", neg, ul, neg, ul) <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for serial failed");
+ ret = -1;
+ goto exit;
+ }
+ } else {
+ if (bs->type == V_ASN1_NEG_INTEGER) {
+ if (BIO_puts(bio, " (Negative)") < 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for serial failed");
+ ret = -1;
+ goto exit;
+ }
+ }
+ for (int i = 0; i < bs->length; i++) {
+ if (BIO_printf(bio, "%02x%c", bs->data[i],
+ ((i + 1 == bs->length) ? '\n' : ':')) <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for serial failed");
+ ret = -1;
+ goto exit;
+ }
+ }
+ }
+
+ if (BIO_puts(bio, "issuer name : ") <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for issuer failed");
+ ret = -1;
+ goto exit;
+ }
+ if (X509_NAME_print_ex(bio, X509_get_issuer_name(crt), 0, 0) < 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "X509_NAME_print_ex() for issuer failed");
+ ret = -1;
+ goto exit;
+ }
+
+ if (BIO_puts(bio, "\nsubject name : ") <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for sublect failed");
+ ret = -1;
+ goto exit;
+ }
+ if (X509_NAME_print_ex(bio, X509_get_subject_name(crt), 0, 0) < 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "X509_NAME_print_ex() for subject failed");
+ ret = -1;
+ goto exit;
+ }
+
+ if (BIO_puts(bio, "\nissued on : ") <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for issued on failed");
+ ret = -1;
+ goto exit;
+ }
+ if (!ASN1_TIME_print(bio, X509_get0_notBefore(crt))) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_TIME_print() for issued on failed");
+ ret = -1;
+ goto exit;
+ }
+
+ if (BIO_puts(bio, "\nexpires on : ") <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for expires on failed");
+ ret = -1;
+ goto exit;
+ }
+ if (!ASN1_TIME_print(bio, X509_get0_notAfter(crt))) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_TIME_print() for expires on failed");
+ ret = -1;
+ goto exit;
+ }
+
+ if (BIO_puts(bio, "\nsigned using : ") <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_puts() for signed using failed");
+ ret = -1;
+ goto exit;
+ }
+ tsig_alg = X509_get0_tbs_sigalg(crt);
+ if (!i2a_ASN1_OBJECT(bio, tsig_alg->algorithm)) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "i2a_ASN1_OBJECT() for signed using on failed");
+ ret = -1;
+ goto exit;
+ }
+ pkey = X509_get_pubkey(crt);
+ if (!pkey) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "X509_get_pubkey() failed");
+ ret = -1;
+ goto exit;
+ }
+#define BC "18"
+ switch (EVP_PKEY_base_id(pkey)) {
+ case EVP_PKEY_RSA:
+ ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "RSA key size", EVP_PKEY_bits(pkey));
+ break;
+ case EVP_PKEY_DSA:
+ ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "DSA key size", EVP_PKEY_bits(pkey));
+ break;
+ default:
+ ret = BIO_printf(bio, "\n%-" BC "s: %d bits", "non-RSA/DSA key size", EVP_PKEY_bits(pkey));
+ break;
+ }
+ if (ret <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for key size failed");
+ ret = -1;
+ goto exit;
+ }
+
+ loc = X509_get_ext_by_NID(crt, NID_basic_constraints, -1);
+ if (loc != -1) {
+ X509_EXTENSION *ex = X509_get_ext(crt, loc);
+ if (BIO_puts(bio, "\nbasic constraints : ") <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for basic constraints failed");
+ ret = -1;
+ goto exit;
+ }
+ if (!X509V3_EXT_print(bio, ex, 0, 0)) {
+ if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex), ASN1_STRFLGS_RFC2253)) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_STRING_print_ex() for basic constraints failed");
+ ret = -1;
+ goto exit;
+ }
+ }
+ }
+
+ loc = X509_get_ext_by_NID(crt, NID_subject_alt_name, -1);
+ if (loc != -1) {
+ X509_EXTENSION *ex = X509_get_ext(crt, loc);
+ if (BIO_puts(bio, "\nsubject alt name : ") <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for alt name failed");
+ ret = -1;
+ goto exit;
+ }
+ if (!X509V3_EXT_print(bio, ex, 0, 0)) {
+ if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex), ASN1_STRFLGS_RFC2253)) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_STRING_print_ex() for alt name failed");
+ ret = -1;
+ goto exit;
+ }
+ }
+ }
+
+ loc = X509_get_ext_by_NID(crt, NID_netscape_cert_type, -1);
+ if (loc != -1) {
+ X509_EXTENSION *ex = X509_get_ext(crt, loc);
+ if (BIO_puts(bio, "\ncert. type : ") <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for cert type failed");
+ ret = -1;
+ goto exit;
+ }
+ if (!X509V3_EXT_print(bio, ex, 0, 0)) {
+ if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex), ASN1_STRFLGS_RFC2253)) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_STRING_print_ex() for cert type failed");
+ ret = -1;
+ goto exit;
+ }
+ }
+ }
+
+ loc = X509_get_ext_by_NID(crt, NID_key_usage, -1);
+ if (loc != -1) {
+ X509_EXTENSION *ex = X509_get_ext(crt, loc);
+ if (BIO_puts(bio, "\nkey usage : ") <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for key usage failed");
+ ret = -1;
+ goto exit;
+ }
+ if (!X509V3_EXT_print(bio, ex, 0, 0)) {
+ if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex), ASN1_STRFLGS_RFC2253)) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_STRING_print_ex() for key usage failed");
+ ret = -1;
+ goto exit;
+ }
+ }
+ }
+
+ loc = X509_get_ext_by_NID(crt, NID_ext_key_usage, -1);
+ if (loc != -1) {
+ X509_EXTENSION *ex = X509_get_ext(crt, loc);
+ if (BIO_puts(bio, "\next key usage : ") <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for ext key usage failed");
+ ret = -1;
+ goto exit;
+ }
+ if (!X509V3_EXT_print(bio, ex, 0, 0)) {
+ if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex), ASN1_STRFLGS_RFC2253)) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_STRING_print_ex() for ext key usage failed");
+ ret = -1;
+ goto exit;
+ }
+ }
+ }
+
+ loc = X509_get_ext_by_NID(crt, NID_certificate_policies, -1);
+ if (loc != -1) {
+ X509_EXTENSION *ex = X509_get_ext(crt, loc);
+ if (BIO_puts(bio, "\ncertificate policies : ") <= 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_printf() for certificate policies failed");
+ ret = -1;
+ goto exit;
+ }
+ if (!X509V3_EXT_print(bio, ex, 0, 0)) {
+ if (!ASN1_STRING_print_ex(bio, X509_EXTENSION_get_data(ex), ASN1_STRFLGS_RFC2253)) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "ASN1_STRING_print_ex() for certificate policies failed");
+ ret = -1;
+ goto exit;
+ }
+ }
+ }
+
+ /* make valgrind happy */
+ static const char zero = 0;
+ BIO_write(bio, &zero, 1);
+
+ len = BIO_get_mem_data(bio, &bio_mem_data);
+ encoded_text = html_encode(bio_mem_data);
+ strlcpy(last->info_buf, encoded_text, sizeof(last->info_buf));
+ freez(encoded_text);
+ ret = 0;
+
+exit:
+ if (bio) BIO_free(bio);
+ if (pkey) EVP_PKEY_free(pkey);
+ return ret;
+}
+
+/*********************************************************************
+ *
+ * Function : host_to_hash
+ *
+ * Description : Creates MD5 hash from host name. Host name is loaded
+ * from structure csp and saved again into it.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : 1 => Error while creating hash
+ * 0 => Hash created successfully
+ *
+ *********************************************************************/
+static int host_to_hash(struct client_state *csp)
+{
+ int ret = 0;
+
+ memset(csp->http->hash_of_host, 0, sizeof(csp->http->hash_of_host));
+ MD5((unsigned char *)csp->http->host, strlen(csp->http->host),
+ csp->http->hash_of_host);
+
+ /* Converting hash into string with hex */
+ size_t i = 0;
+ for (; i < 16; i++)
+ {
+ if ((ret = sprintf((char *)csp->http->hash_of_host_hex + 2 * i, "%02x",
+ csp->http->hash_of_host[i])) < 0)
+ {
+ log_error(LOG_LEVEL_ERROR, "Sprintf return value: %d", ret);
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/*********************************************************************
+ *
+ * Function : create_client_ssl_connection
+ *
+ * Description : Creates TLS/SSL secured connection with client
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : 0 on success, negative value if connection wasn't created
+ * successfully.
+ *
+ *********************************************************************/
+extern int create_client_ssl_connection(struct client_state *csp)
+{
+ struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
+ /* Paths to certificates file and key file */
+ char *key_file = NULL;
+ char *ca_file = NULL;
+ char *cert_file = NULL;
+ int ret = 0;
+ SSL* ssl;
+
+ /*
+ * Initializing mbedtls structures for TLS/SSL connection
+ */
+ openssl_init();
+
+ /*
+ * Preparing hash of host for creating certificates
+ */
+ ret = host_to_hash(csp);
+ if (ret != 0)
+ {
+ log_error(LOG_LEVEL_ERROR, "Generating hash of host failed: %d", ret);
+ ret = -1;
+ goto exit;
+ }
+
+ /*
+ * Preparing paths to certificates files and key file
+ */
+ ca_file = csp->config->ca_cert_file;
+ cert_file = make_certs_path(csp->config->certificate_directory,
+ (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
+ key_file = make_certs_path(csp->config->certificate_directory,
+ (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
+
+ if (cert_file == NULL || key_file == NULL)
+ {
+ ret = -1;
+ goto exit;
+ }
+
+ /*
+ * Generating certificate for requested host. Mutex to prevent
+ * certificate and key inconsistence must be locked.
+ */
+ privoxy_mutex_lock(&certificate_mutex);
+
+ ret = generate_webpage_certificate(csp);
+ if (ret < 0)
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Generate_webpage_certificate failed: %d", ret);
+ privoxy_mutex_unlock(&certificate_mutex);
+ ret = -1;
+ goto exit;
+ }
+ privoxy_mutex_unlock(&certificate_mutex);
+
+ if (!(ssl_attr->openssl_attr.ctx = SSL_CTX_new(SSLv23_server_method()))) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create SSL context");
+ ret = -1;
+ goto exit;
+ }
+
+ /* Set the key and cert */
+ if (SSL_CTX_use_certificate_file(ssl_attr->openssl_attr.ctx,
+ cert_file, SSL_FILETYPE_PEM) != 1) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Loading webpage certificate %s failed", cert_file);
+ ret = -1;
+ goto exit;
+ }
+
+ if (SSL_CTX_use_PrivateKey_file(ssl_attr->openssl_attr.ctx, key_file, SSL_FILETYPE_PEM) != 1) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Loading webpage certificate private key %s failed", key_file);
+ ret = -1;
+ goto exit;
+ }
+
+ SSL_CTX_set_options(ssl_attr->openssl_attr.ctx, SSL_OP_NO_SSLv3);
+
+ if (!(ssl_attr->openssl_attr.bio = BIO_new_ssl(ssl_attr->openssl_attr.ctx, 0))) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create BIO structure");
+ ret = -1;
+ goto exit;
+ }
+
+ if (BIO_get_ssl(ssl_attr->openssl_attr.bio, &ssl) != 1)
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_get_ssl failed");
+ ret = -1;
+ goto exit;
+ }
+
+ if(!SSL_set_fd(ssl, csp->cfd))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_fd failed");
+ ret = -1;
+ goto exit;
+ }
+
+ /*
+ * Handshake with client
+ */
+ log_error(LOG_LEVEL_CONNECT,
+ "Performing the TLS/SSL handshake with client. Hash of host: %s",
+ csp->http->hash_of_host_hex);
+ if (BIO_do_handshake(ssl_attr->openssl_attr.bio) != 1) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_do_handshake failed");
+ ret = -1;
+ goto exit;
+ }
+
+ log_error(LOG_LEVEL_CONNECT, "Client successfully connected over TLS/SSL");
+ csp->ssl_with_client_is_opened = 1;
+ ret = 0;
+
+exit:
+ /*
+ * Freeing allocated paths to files
+ */
+ freez(cert_file);
+ freez(key_file);
+
+ /* Freeing structures if connection wasn't created successfully */
+ if (ret < 0)
+ {
+ free_client_ssl_structures(csp);
+ }
+ return ret;
+}
+
+
+/*********************************************************************
+ *
+ * Function : close_client_ssl_connection
+ *
+ * Description : Closes TLS/SSL connection with client. This function
+ * checks if this connection is already created.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : N/A
+ *
+ *********************************************************************/
+extern void close_client_ssl_connection(struct client_state *csp)
+{
+ struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
+
+ if (csp->ssl_with_client_is_opened == 0)
+ {
+ return;
+ }
+
+ /*
+ * Notifying the peer that the connection is being closed.
+ */
+ BIO_ssl_shutdown(ssl_attr->openssl_attr.bio);
+ free_client_ssl_structures(csp);
+ csp->ssl_with_client_is_opened = 0;
+}
+
+
+/*********************************************************************
+ *
+ * Function : free_client_ssl_structures
+ *
+ * Description : Frees structures used for SSL communication with
+ * client.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : N/A
+ *
+ *********************************************************************/
+static void free_client_ssl_structures(struct client_state *csp)
+{
+ struct ssl_attr *ssl_attr = &csp->ssl_client_attr;
+
+ if (ssl_attr->openssl_attr.bio) BIO_free_all(ssl_attr->openssl_attr.bio);
+ if (ssl_attr->openssl_attr.ctx) SSL_CTX_free(ssl_attr->openssl_attr.ctx);
+}
+
+
+/*********************************************************************
+ *
+ * Function : close_server_ssl_connection
+ *
+ * Description : Closes TLS/SSL connection with server. This function
+ * checks if this connection is already opened.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : N/A
+ *
+ *********************************************************************/
+extern void close_server_ssl_connection(struct client_state *csp)
+{
+ struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
+
+ if (csp->ssl_with_server_is_opened == 0)
+ {
+ return;
+ }
+
+ /*
+ * Notifying the peer that the connection is being closed.
+ */
+ BIO_ssl_shutdown(ssl_attr->openssl_attr.bio);
+ free_server_ssl_structures(csp);
+ csp->ssl_with_server_is_opened = 0;
+}
+
+
+/*********************************************************************
+ *
+ * Function : create_server_ssl_connection
+ *
+ * Description : Creates TLS/SSL secured connection with server.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : 0 on success, negative value if connection wasn't created
+ * successfully.
+ *
+ *********************************************************************/
+extern int create_server_ssl_connection(struct client_state *csp)
+{
+ openssl_connection_attr *ssl_attrs = &csp->ssl_server_attr.openssl_attr;
+ int ret = 0;
+ char *trusted_cas_file = NULL;
+ STACK_OF(X509) *chain;
+ SSL *ssl;
+
+ csp->server_cert_verification_result = SSL_CERT_NOT_VERIFIED;
+ csp->server_certs_chain.next = NULL;
+
+ /* Setting path to file with trusted CAs */
+ trusted_cas_file = csp->config->trusted_cas_file;
+
+
+ ssl_attrs->ctx = SSL_CTX_new(SSLv23_method());
+ if (!ssl_attrs->ctx)
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "SSL context creation failed");
+ ret = -1;
+ goto exit;
+ }
+
+ /*
+ * Loading file with trusted CAs
+ */
+ if(!SSL_CTX_load_verify_locations(ssl_attrs->ctx, trusted_cas_file, NULL))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Loading trusted CAs file %s failed",
+ trusted_cas_file);
+ ret = -1;
+ goto exit;
+ }
+
+ SSL_CTX_set_verify(ssl_attrs->ctx, SSL_VERIFY_NONE, NULL);
+ SSL_CTX_set_options(ssl_attrs->ctx, SSL_OP_NO_SSLv3);
+
+ if (!(ssl_attrs->bio = BIO_new_ssl(ssl_attrs->ctx, 1))) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Unable to create BIO structure");
+ ret = -1;
+ goto exit;
+ }
+
+ if (BIO_get_ssl(ssl_attrs->bio, &ssl) != 1)
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_get_ssl failed");
+ ret = -1;
+ goto exit;
+ }
+
+ if (!SSL_set_fd(ssl, csp->server_connection.sfd))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_fd failed");
+ ret = -1;
+ goto exit;
+ }
+
+ /*
+ * Set the hostname to check against the received server certificate
+ */
+ if (!SSL_set1_host(ssl, csp->http->host))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set1_host failed");
+ ret = -1;
+ goto exit;
+ }
+
+ /* SNI extension */
+ if (!SSL_set_tlsext_host_name(ssl, csp->http->host))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set_tlsext_host_name failed");
+ ret = -1;
+ goto exit;
+ }
+
+ /*
+ * Handshake with server
+ */
+ log_error(LOG_LEVEL_CONNECT,
+ "Performing the TLS/SSL handshake with the server");
+
+ if (BIO_do_handshake(ssl_attrs->bio) != 1)
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "BIO_do_handshake failed");
+ ret = -1;
+ goto exit;
+ }
+
+ chain = SSL_get_peer_cert_chain(ssl);
+ if (chain) {
+ for (int i = 0; i < sk_X509_num(chain); i++) {
+ if (ssl_store_cert(csp, sk_X509_value(chain, i)) != 0) {
+ log_error(LOG_LEVEL_ERROR, "ssl_store_cert failed");
+ ret = -1;
+ goto exit;
+ }
+ }
+ }
+
+ if (!csp->dont_verify_certificate)
+ {
+ long verify_result = SSL_get_verify_result(ssl);
+ if (verify_result == X509_V_OK)
+ {
+ ret = 0;
+ csp->server_cert_verification_result = SSL_CERT_VALID;
+ } else {
+ csp->server_cert_verification_result = verify_result;
+ log_error(LOG_LEVEL_ERROR, "SSL_get_verify_result failed: %s",
+ X509_verify_cert_error_string(verify_result));
+ ret = -1;
+ goto exit;
+ }
+ }
+
+ log_error(LOG_LEVEL_CONNECT, "Server successfully connected over TLS/SSL");
+
+ /*
+ * Server certificate chain is valid, so we can clean
+ * chain, because we will not send it to client.
+ */
+ free_certificate_chain(csp);
+
+ csp->ssl_with_server_is_opened = 1;
+exit:
+ /* Freeing structures if connection wasn't created successfully */
+ if (ret < 0)
+ {
+ free_server_ssl_structures(csp);
+ }
+
+ return ret;
+}
+
+
+/*********************************************************************
+ *
+ * Function : free_server_ssl_structures
+ *
+ * Description : Frees structures used for SSL communication with server
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : N/A
+ *
+ *********************************************************************/
+static void free_server_ssl_structures(struct client_state *csp)
+{
+ struct ssl_attr *ssl_attr = &csp->ssl_server_attr;
+
+ if (ssl_attr->openssl_attr.bio) BIO_free_all(ssl_attr->openssl_attr.bio);
+ if (ssl_attr->openssl_attr.ctx) SSL_CTX_free(ssl_attr->openssl_attr.ctx);
+}
+
+
+/*********************************************************************
+ *
+ * Function : log_ssl_errors
+ *
+ * Description : Log SSL errors
+ *
+ * Parameters :
+ * 1 : debuglevel = Debug level
+ * 2 : desc = Error description
+ *
+ * Returns : N/A
+ *
+ *********************************************************************/
+static void log_ssl_errors(int debuglevel, const char* fmt, ...)
+{
+ unsigned long err_code;
+ char prefix[ERROR_BUF_SIZE];
+ va_list args;
+ va_start(args, fmt);
+ vsnprintf(prefix, sizeof(prefix), fmt, args);
+ int reported = 0;
+
+ while ((err_code = ERR_get_error())) {
+ char err_buf[ERROR_BUF_SIZE];
+ reported = 1;
+ ERR_error_string_n(err_code, err_buf, sizeof(err_buf));
+ log_error(debuglevel, "%s: %s", prefix, err_buf);
+ }
+ va_end(args);
+ /* in case if called by mistake and there were no SSL errors let's report it to the log */
+ if (!reported)
+ log_error(debuglevel, "%s: no ssl errors detected", prefix);
+}
+
+
+/*********************************************************************
+ *
+ * Function : ssl_base64_encode
+ *
+ * Description : Encode a buffer into base64 format.
+ *
+ * Parameters :
+ * 1 : dst = Destination buffer
+ * 2 : dlen = Destination buffer length
+ * 3 : olen = Number of bytes written
+ * 4 : src = Source buffer
+ * 5 : slen = Amount of data to be encoded
+ *
+ * Returns : 0 on success, error code othervise
+ *
+ *********************************************************************/
+extern int ssl_base64_encode(unsigned char *dst, size_t dlen, size_t *olen,
+ const unsigned char *src, size_t slen )
+{
+ *olen = 4 * ((slen/3) + ((slen%3) ? 1 : 0)) + 1;
+ if (*olen < dlen)
+ return ENOBUFS;
+ *olen = (size_t)EVP_EncodeBlock(dst, src, (int)slen) + 1;
+ return 0;
+}
+
+
+/*********************************************************************
+ *
+ * Function : close_file_stream
+ *
+ * Description : Close file stream, report error on close error
+ *
+ * Parameters :
+ * 1 : f = file stream to close
+ * 2 : path = path for error report
+ *
+ * Returns : N/A
+ *
+ *********************************************************************/
+static void close_file_stream(FILE *f, const char* path) {
+ if (fclose(f) != 0) {
+ log_error(LOG_LEVEL_ERROR, "Error closing file %s: %s", path, strerror(errno));
+ }
+}
+
+
+/*********************************************************************
+ *
+ * Function : write_certificate
+ *
+ * Description : Writes certificate into file.
+ *
+ * Parameters :
+ * 1 : crt = certificate to write into file
+ * 2 : output_file = path to save certificate file
+ *
+ * on error
+ * Returns : 1 on success success or negative value
+ *
+ *********************************************************************/
+static int write_certificate(X509 *crt, const char *output_file)
+{
+ FILE *f = NULL;
+ int ret = -1;
+
+ /*
+ * Saving certificate into file
+ */
+ if ((f = fopen(output_file, "w")) == NULL)
+ {
+ log_error(LOG_LEVEL_ERROR, "Opening file %s to save certificate failed",
+ output_file);
+ return ret;
+ }
+
+ ret = PEM_write_X509(f, crt);
+ if (!ret)
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR,
+ "Writing certificate into file %s failed", output_file);
+ ret = -1;
+ }
+
+ close_file_stream(f, output_file);
+
+ return ret;
+}
+
+/*********************************************************************
+ *
+ * Function : write_private_key
+ *
+ * Description : Writes private key into file and copies saved
+ * content into given pointer to string. If function
+ * returns 0 for success, this copy must be freed by
+ * caller.
+ *
+ * Parameters :
+ * 1 : key = key to write into file
+ * 2 : ret_buf = pointer to string with created key file content
+ * 3 : key_file_path = path where to save key file
+ *
+ * Returns : Length of written private key on success or negative value
+ * on error
+ *
+ *********************************************************************/
+static int write_private_key(EVP_PKEY *key, char **ret_buf,
+ const char *key_file_path)
+{
+ size_t len = 0; /* Length of created key */
+ FILE *f = NULL; /* File to save certificate */
+ int ret = 0;
+ BIO *bio_mem = BIO_new(BIO_s_mem());
+ char *bio_mem_data = 0;
+
+ if (bio_mem == NULL) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "write_private_key memory allocation failure");
+ return -1;
+ }
+
+ /*
+ * Writing private key into PEM string
+ */
+ if (!PEM_write_bio_PrivateKey(bio_mem, key, NULL, NULL, 0, NULL, NULL)) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Writing private key into PEM string failed");
+ ret = -1;
+ goto exit;
+ }
+
+ len = (size_t)BIO_get_mem_data(bio_mem, &bio_mem_data);
+
+ /* Initializing buffer for key file content */
+ *ret_buf = zalloc_or_die(len + 1);
+ (*ret_buf)[len] = 0;
+
+ strncpy(*ret_buf, bio_mem_data, len);
+
+ /*
+ * Saving key into file
+ */
+ if ((f = fopen(key_file_path, "wb")) == NULL)
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Opening file %s to save private key failed: %E",
+ key_file_path);
+ ret = -1;
+ goto exit;
+ }
+
+ if (fwrite(*ret_buf, 1, len, f) != len)
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Writing private key into file %s failed",
+ key_file_path);
+ close_file_stream(f, key_file_path);
+ ret = -1;
+ goto exit;
+ }
+
+ close_file_stream(f, key_file_path);
+
+exit:
+ BIO_free(bio_mem);
+ if (ret < 0)
+ {
+ freez(*ret_buf);
+ *ret_buf = NULL;
+ return ret;
+ }
+ return (int)len;
+}
+
+
+/*********************************************************************
+ *
+ * Function : generate_key
+ *
+ * Description : Tests if private key for host saved in csp already
+ * exists. If this file doesn't exists, a new key is
+ * generated and saved in a file. The generated key is also
+ * copied into given parameter key_buf, which must be then
+ * freed by caller. If file with key exists, key_buf
+ * contain NULL and no private key is generated.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ * 2 : key_buf = buffer to save new generated key
+ *
+ * Returns : -1 => Error while generating private key
+ * 0 => Key already exists
+ * >0 => Length of generated private key
+ *
+ *********************************************************************/
+static int generate_key(struct client_state *csp, char **key_buf)
+{
+ int ret = 0;
+ char* key_file_path = NULL;
+ BIGNUM *exp = BN_new();
+ RSA *rsa = RSA_new();
+ EVP_PKEY *key = EVP_PKEY_new();
+
+ if (exp == NULL || rsa == NULL || key == NULL) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "RSA key memory allocation failure");
+ ret = -1;
+ goto exit;
+ }
+
+ BN_set_word(exp, RSA_KEY_PUBLIC_EXPONENT);
+
+ key_file_path = make_certs_path(csp->config->certificate_directory,
+ (char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
+ if (key_file_path == NULL)
+ {
+ ret = -1;
+ goto exit;
+ }
+
+ /*
+ * Test if key already exists. If so, we don't have to create it again.
+ */
+ if (file_exists(key_file_path) == 1)
+ {
+ ret = 0;
+ goto exit;
+ }
+
+ ret = RSA_generate_key_ex(rsa, RSA_KEYSIZE, exp, NULL);
+ if (ret == 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "RSA key generation failure");
+ ret = -1;
+ goto exit;
+ }
+
+ if (!EVP_PKEY_set1_RSA(key, rsa)) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Error assigning RSA key pair to PKEY structure");
+ ret = -1;
+ goto exit;
+ }
+
+ /*
+ * Exporting private key into file
+ */
+ if ((ret = write_private_key(key, key_buf, key_file_path)) < 0)
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Writing private key into file %s failed", key_file_path);
+ ret = -1;
+ goto exit;
+ }
+
+exit:
+ /*
+ * Freeing used variables
+ */
+ if (exp) BN_free(exp);
+ if (rsa) RSA_free(rsa);
+ if (key) EVP_PKEY_free(key);
+ freez(key_file_path);
+
+ return ret;
+}
+
+/*********************************************************************
+ *
+ * Function : ssl_certificate_load
+ *
+ * Description : Loads certificate from file.
+ *
+ * Parameters :
+ * 1 : cert_path = The certificate path to load
+ *
+ * Returns : NULL => error loading certificate,
+ * pointer to certificate instance otherwise
+ *
+ *********************************************************************/
+static X509* ssl_certificate_load(const char *cert_path)
+{
+ X509 *cert = NULL;
+ FILE *cert_f = NULL;
+
+ if (!(cert_f = fopen(cert_path, "r"))) {
+ log_error(LOG_LEVEL_ERROR, "Error opening certificate file %s: %s", cert_path, strerror(errno));
+ return NULL;
+ }
+
+ if (!(cert = PEM_read_X509(cert_f, NULL, NULL, NULL))) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Error reading certificate file %s", cert_path);
+ }
+
+ close_file_stream(cert_f, cert_path);
+ return cert;
+}
+
+
+/*********************************************************************
+ *
+ * Function : ssl_certificate_is_invalid
+ *
+ * Description : Checks whether or not a certificate is valid.
+ * Currently only checks that the certificate can be
+ * parsed and that the "valid to" date is in the future.
+ *
+ * Parameters :
+ * 1 : cert_file = The certificate to check
+ *
+ * Returns : 0 => The certificate is valid.
+ * 1 => The certificate is invalid
+ *
+ *********************************************************************/
+static int ssl_certificate_is_invalid(const char *cert_file)
+{
+ int ret;
+
+ X509 *cert = NULL;
+
+ if (!(cert = ssl_certificate_load(cert_file))) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Error reading certificate file %s", cert_file);
+ return 1;
+ }
+
+ ret = X509_cmp_current_time(X509_get_notAfter(cert));
+ if (ret == 0) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Error checking certificate %s validity", cert_file);
+ }
+
+ X509_free(cert);
+
+ return ret == -1 ? 1 : 0;
+}
+
+/*********************************************************************
+ *
+ * Function : set_x509_ext
+ *
+ * Description : Sets the X509V3 extension data
+ *
+ * Parameters :
+ * 1 : cert = The certificate to modify
+ * 2 : issuer = Issuer certificate
+ * 3 : nid = OpenSSL NID
+ * 2 : data = extension value
+ *
+ * Returns : 0 => Error while setting extensuon data
+ * 1 => It worked
+ *
+ *********************************************************************/
+static int set_x509_ext(X509 *cert, X509 *issuer, int nid, const char *value)
+{
+ X509_EXTENSION * ext = NULL;
+ X509V3_CTX ctx;
+ int ret = 0;
+
+ X509V3_set_ctx(&ctx, issuer, cert, NULL, NULL, 0);
+ ext = X509V3_EXT_conf_nid(NULL, &ctx, nid, value);
+ if (!ext)
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "X509V3_EXT_conf_nid failure");
+ goto exit;
+ }
+
+ if (!X509_add_ext(cert, ext, -1))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "X509_add_ext failure");
+ goto exit;
+ }
+
+ ret = 1;
+exit:
+ if (ext) X509_EXTENSION_free(ext);
+ return ret;
+}
+
+
+/*********************************************************************
+ *
+ * Function : set_subject_alternative_name
+ *
+ * Description : Sets the Subject Alternative Name extension to a cert
+ *
+ * Parameters :
+ * 1 : cert = The certificate to modify
+ * 2 : issuer = Issuer certificate
+ * 2 : hostname = The hostname to add
+ *
+ * Returns : 0 => Error while creating certificate.
+ * 1 => It worked
+ *
+ *********************************************************************/
+static int set_subject_alternative_name(X509 *cert, X509 *issuer, const char *hostname)
+{
+ size_t altname_len = strlen(hostname) + sizeof(CERTIFICATE_ALT_NAME_PREFIX);
+ char alt_name_buf[altname_len];
+
+ snprintf(alt_name_buf, sizeof(alt_name_buf), CERTIFICATE_ALT_NAME_PREFIX"%s", hostname);
+ return set_x509_ext(cert, issuer, NID_subject_alt_name, alt_name_buf);
+}
+
+
+/*********************************************************************
+ *
+ * Function : generate_webpage_certificate
+ *
+ * Description : Creates certificate file in presetted directory.
+ * If certificate already exists, no other certificate
+ * will be created. Subject of certificate is named
+ * by csp->http->host from parameter. This function also
+ * triggers generating of private key for new certificate.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : -1 => Error while creating certificate.
+ * 0 => Certificate already exists.
+ * 1 => Certificate created
+ *
+ *********************************************************************/
+static int generate_webpage_certificate(struct client_state *csp)
+{
+ char *key_buf = NULL; /* Buffer for created key */
+ X509* issuer_cert = NULL;
+ X509* cert = NULL;
+ BIO* pk_bio = NULL;
+ EVP_PKEY *loaded_subject_key = NULL;
+ EVP_PKEY *loaded_issuer_key = NULL;
+ X509_NAME* issuer_name;
+ X509_NAME* subject_name = NULL;
+ ASN1_TIME* asn_time = NULL;
+ ASN1_INTEGER *serial = NULL;
+ BIGNUM *serial_num = NULL;
+
+ int ret = 0;
+ cert_options cert_opt;
+ char cert_valid_from[VALID_DATETIME_BUFLEN];
+ char cert_valid_to[VALID_DATETIME_BUFLEN];
+
+ /* Paths to keys and certificates needed to create certificate */
+ cert_opt.issuer_key = NULL;
+ cert_opt.subject_key = NULL;
+ cert_opt.issuer_crt = NULL;
+
+ cert_opt.output_file = make_certs_path(csp->config->certificate_directory,
+ (const char *)csp->http->hash_of_host_hex, CERT_FILE_TYPE);
+ if (cert_opt.output_file == NULL)
+ {
+ return -1;
+ }
+
+ cert_opt.subject_key = make_certs_path(csp->config->certificate_directory,
+ (const char *)csp->http->hash_of_host_hex, KEY_FILE_TYPE);
+ if (cert_opt.subject_key == NULL)
+ {
+ freez(cert_opt.output_file);
+ return -1;
+ }
+
+ if (file_exists(cert_opt.output_file) == 1)
+ {
+ /* The file exists, but is it valid? */
+ if (ssl_certificate_is_invalid(cert_opt.output_file))
+ {
+ log_error(LOG_LEVEL_CONNECT,
+ "Certificate %s is no longer valid. Removing it.",
+ cert_opt.output_file);
+ if (unlink(cert_opt.output_file))
+ {
+ log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
+ cert_opt.output_file);
+
+ freez(cert_opt.output_file);
+ freez(cert_opt.subject_key);
+
+ return -1;
+ }
+ if (unlink(cert_opt.subject_key))
+ {
+ log_error(LOG_LEVEL_ERROR, "Failed to unlink %s: %E",
+ cert_opt.subject_key);
+
+ freez(cert_opt.output_file);
+ freez(cert_opt.subject_key);
+
+ return -1;
+ }
+ }
+ else
+ {
+ freez(cert_opt.output_file);
+ freez(cert_opt.subject_key);
+
+ return 0;
+ }
+ }
+
+ /*
+ * Create key for requested host
+ */
+ int subject_key_len = generate_key(csp, &key_buf);
+ if (subject_key_len < 0)
+ {
+ freez(cert_opt.output_file);
+ freez(cert_opt.subject_key);
+ log_error(LOG_LEVEL_ERROR, "Key generating failed");
+ return -1;
+ }
+
+ /*
+ * Converting unsigned long serial number to char * serial number.
+ * We must compute length of serial number in string + terminating null.
+ */
+ unsigned long certificate_serial = get_certificate_serial(csp);
+ unsigned long certificate_serial_time = (unsigned long)time(NULL);
+ int serial_num_size = snprintf(NULL, 0, "%lu%lu",
+ certificate_serial_time, certificate_serial) + 1;
+ if (serial_num_size <= 0)
+ {
+ serial_num_size = 1;
+ }
+
+ char serial_num_text[serial_num_size]; /* Buffer for serial number */
+ ret = snprintf(serial_num_text, (size_t)serial_num_size, "%lu%lu",
+ certificate_serial_time, certificate_serial);
+ if (ret < 0 || ret >= serial_num_size)
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Converting certificate serial number into string failed");
+ ret = -1;
+ goto exit;
+ }
+
+ /*
+ * Preparing parameters for certificate
+ */
+ subject_name = X509_NAME_new();
+ if (!subject_name)
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "RSA key memory allocation failure");
+ ret = -1;
+ goto exit;
+ }
+
+ if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_COMMON_NAME_FCODE, MBSTRING_ASC,
+ (void*)csp->http->host, -1, -1, 0))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "X509 subject name (code: %s, val: %s) error",
+ CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
+ ret = -1;
+ goto exit;
+ }
+ if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_ORGANIZATION_FCODE, MBSTRING_ASC,
+ (void*)csp->http->host, -1, -1, 0))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "X509 subject name (code: %s, val: %s) error",
+ CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
+ ret = -1;
+ goto exit;
+ }
+ if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_ORG_UNIT_FCODE, MBSTRING_ASC,
+ (void*)csp->http->host, -1, -1, 0))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "X509 subject name (code: %s, val: %s) error",
+ CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
+ ret = -1;
+ goto exit;
+ }
+ if (!X509_NAME_add_entry_by_txt(subject_name, CERT_PARAM_COUNTRY_FCODE, MBSTRING_ASC,
+ (void*)CERT_PARAM_COUNTRY_CODE, -1, -1, 0))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "X509 subject name (code: %s, val: %s) error",
+ CERT_PARAM_COMMON_NAME_FCODE, csp->http->host);
+ ret = -1;
+ goto exit;
+ }
+
+ cert_opt.issuer_crt = csp->config->ca_cert_file;
+ cert_opt.issuer_key = csp->config->ca_key_file;
+
+ if (get_certificate_valid_from_date(cert_valid_from, sizeof(cert_valid_from), VALID_DATETIME_FMT)
+ || get_certificate_valid_to_date(cert_valid_to, sizeof(cert_valid_to), VALID_DATETIME_FMT))
+ {
+ log_error(LOG_LEVEL_ERROR, "Generating one of the validity dates failed");
+ ret = -1;
+ goto exit;
+ }
+
+ cert_opt.subject_pwd = CERT_SUBJECT_PASSWORD;
+ cert_opt.issuer_pwd = csp->config->ca_password;
+ cert_opt.not_before = cert_valid_from;
+ cert_opt.not_after = cert_valid_to;
+ cert_opt.serial = serial_num_text;
+ cert_opt.max_pathlen = -1;
+
+ /*
+ * Test if the private key was already created.
+ * XXX: Can this still happen?
+ */
+ if (subject_key_len == 0)
+ {
+ log_error(LOG_LEVEL_ERROR, "Subject key was already created");
+ ret = 0;
+ goto exit;
+ }
+
+ /*
+ * Parse serial to MPI
+ */
+ serial_num = BN_new();
+ if (!serial_num)
+ {
+ log_error(LOG_LEVEL_ERROR, "generate_webpage_certificate: memory error");
+ ret = -1;
+ goto exit;
+ }
+ if (!BN_dec2bn(&serial_num, cert_opt.serial))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Failed to parse serial %s", cert_opt.serial);
+ ret = -1;
+ goto exit;
+ }
+
+ if (!(serial = BN_to_ASN1_INTEGER(serial_num, NULL)))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Failed to generate serial ASN1 representation");
+ ret = -1;
+ goto exit;
+ }
+
+ /*
+ * Loading certificates
+ */
+ if (!(issuer_cert = ssl_certificate_load(cert_opt.issuer_crt)))
+ {
+ log_error(LOG_LEVEL_ERROR, "Loading issuer certificate %s failed", cert_opt.issuer_crt);
+ ret = -1;
+ goto exit;
+ }
+
+ issuer_name = X509_get_issuer_name(issuer_cert);
+
+ /*
+ * Loading keys from file or from buffer
+ */
+ if (key_buf != NULL && subject_key_len > 0)
+ {
+ pk_bio = BIO_new_mem_buf(key_buf, subject_key_len);
+ }
+ else if (!(pk_bio = BIO_new_file(cert_opt.subject_key, "r")))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Failure opening subject key %s BIO", cert_opt.subject_key);
+ ret = -1;
+ goto exit;
+ }
+
+ loaded_subject_key = PEM_read_bio_PrivateKey(pk_bio, NULL, NULL, (void*)cert_opt.subject_pwd);
+ if (!loaded_subject_key)
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Parsing subject key %s failed", cert_opt.subject_key);
+ ret = -1;
+ goto exit;
+ }
+
+ if (!BIO_free(pk_bio)) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Error closing subject key BIO");
+ }
+
+ if (!(pk_bio = BIO_new_file(cert_opt.issuer_key, "r")))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Failure opening issuer key %s BIO", cert_opt.issuer_key);
+ ret = -1;
+ goto exit;
+ }
+
+ loaded_issuer_key = PEM_read_bio_PrivateKey(pk_bio, NULL, NULL, (void*)cert_opt.issuer_pwd);
+ if (!loaded_issuer_key)
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Parsing issuer key %s failed", cert_opt.subject_key);
+ ret = -1;
+ goto exit;
+ }
+
+ cert = X509_new();
+ if (!cert)
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Certificate allocation error");
+ ret = -1;
+ goto exit;
+ }
+
+ if (!X509_set_version(cert, CERTIFICATE_VERSION))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "X509_set_version failed");
+ ret = -1;
+ goto exit;
+ }
+
+ /*
+ * Setting parameters of signed certificate
+ */
+ if (!X509_set_pubkey(cert, loaded_subject_key)) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Setting issuer name in signed certificate failed");
+ ret = -1;
+ goto exit;
+ }
+
+ if (!X509_set_subject_name(cert, subject_name))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Setting issuer name in signed certificate failed");
+ ret = -1;
+ goto exit;
+ }
+
+ if (!X509_set_issuer_name(cert, issuer_name))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Setting issuer name in signed certificate failed");
+ ret = -1;
+ goto exit;
+ }
+
+ if (!X509_set_serialNumber(cert, serial))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Setting serial number in signed certificate failed");
+ ret = -1;
+ goto exit;
+ }
+
+ asn_time = ASN1_TIME_new();
+ if (!asn_time) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time memory allocation failure");
+ ret = -1;
+ goto exit;
+ }
+
+ if (!ASN1_TIME_set_string(asn_time, cert_opt.not_after)) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time [%s] encode error", cert_opt.not_after);
+ ret = -1;
+ goto exit;
+ }
+
+ if (!X509_set1_notAfter(cert, asn_time))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Setting valid not after in signed certificate failed");
+ ret = -1;
+ goto exit;
+ }
+
+ if (!ASN1_TIME_set_string(asn_time, cert_opt.not_before)) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "ASN1 time encode error");
+ ret = -1;
+ goto exit;
+ }
+
+ if (!X509_set1_notBefore(cert, asn_time))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Setting valid not befre in signed certificate failed");
+ ret = -1;
+ goto exit;
+ }
+
+ if(!set_x509_ext(cert, issuer_cert, NID_basic_constraints, CERTIFICATE_BASIC_CONSTRAINTS))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Setting the basicConstraints extension "
+ "in signed certificate failed");
+ ret = -1;
+ goto exit;
+ }
+
+ if (!set_x509_ext(cert, issuer_cert, NID_subject_key_identifier, CERTIFICATE_SUBJECT_KEY))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Setting the Subject Key Identifie extension failed");
+ ret = -1;
+ goto exit;
+ }
+
+ if (!set_x509_ext(cert, issuer_cert, NID_authority_key_identifier, CERTIFICATE_AUTHORITY_KEY))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Setting the Authority Key Identifier extension failed");
+ ret = -1;
+ goto exit;
+ }
+
+ if (!host_is_ip_address(csp->http->host) &&
+ !set_subject_alternative_name(cert, issuer_cert, csp->http->host))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Setting the Subject Alt Nameextension failed");
+ ret = -1;
+ goto exit;
+ }
+
+ if (!X509_sign(cert, loaded_issuer_key, EVP_sha256()))
+ {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Signing certificate failed");
+ ret = -1;
+ goto exit;
+ }
+
+ /*
+ * Writing certificate into file
+ */
+ if (write_certificate(cert, cert_opt.output_file) < 0)
+ {
+ log_error(LOG_LEVEL_ERROR, "Writing certificate into file failed");
+ ret = -1;
+ goto exit;
+ }
+
+ ret = 1;
+
+exit:
+ /*
+ * Freeing used structures
+ */
+ if (issuer_cert) X509_free(issuer_cert);
+ if (cert) X509_free(cert);
+ if (pk_bio && !BIO_free(pk_bio)) {
+ log_ssl_errors(LOG_LEVEL_ERROR, "Error closing pk BIO");
+ }
+ if (loaded_subject_key) EVP_PKEY_free(loaded_subject_key);
+ if (loaded_issuer_key) EVP_PKEY_free(loaded_issuer_key);
+ if (subject_name) X509_NAME_free(subject_name);
+ if (asn_time) ASN1_TIME_free(asn_time);
+ if (serial_num) BN_free(serial_num);
+ if (serial) ASN1_INTEGER_free(serial);
+ freez(cert_opt.subject_key);
+ freez(cert_opt.output_file);
+ freez(key_buf);
+
+ return ret;
+}
+
+
+/*********************************************************************
+ *
+ * Function : ssl_crt_verify_info
+ *
+ * Description : Returns an informational string about the verification
+ * status of a certificate.
+ *
+ * Parameters :
+ * 1 : buf = Buffer to write to
+ * 2 : size = Maximum size of buffer
+ * 3 : csp = client state
+ *
+ * Returns : N/A
+ *
+ *********************************************************************/
+extern void ssl_crt_verify_info(char *buf, size_t size, struct client_state *csp)
+{
+ strncpy(buf, X509_verify_cert_error_string(csp->server_cert_verification_result), size);
+ buf[size - 1] = 0;
+}
+
+
+/*********************************************************************
+ *
+ * Function : ssl_release
+ *
+ * Description : Release all SSL resources
+ *
+ * Parameters :
+ *
+ * Returns : N/A
+ *
+ *********************************************************************/
+extern void ssl_release(void)
+{
+ if (ssl_inited == 1)
+ {
+ SSL_COMP_free_compression_methods();
+
+ CONF_modules_free();
+ CONF_modules_unload(1);
+
+ COMP_zlib_cleanup();
+
+ ERR_free_strings();
+ EVP_cleanup();
+
+ CRYPTO_cleanup_all_ex_data();
+ }
+}
+
projects / privoxy.git / commitdiff