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- /*********************************************************************
- *
- * File : $Source: /cvsroot/ijbswa/current/openssl.c,v $
- *
- * 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>
- * Copyright (C) 2017 Vaclav Svec. FIT CVUT.
- * Copyright (C) 2018-2020 by Fabian Keil <fk@fabiankeil.de>
- *
- * 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;
- #if OPENSSL_VERSION_NUMBER < 0x10100000L
- #define X509_set1_notBefore X509_set_notBefore
- #define X509_set1_notAfter X509_set_notAfter
- #define X509_get0_serialNumber X509_get_serialNumber
- #define X509_get0_notBefore X509_get_notBefore
- #define X509_get0_notAfter X509_get_notAfter
- #endif
- /*********************************************************************
- *
- * 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_attr = 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_attr = 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;
- SSL *ssl;
- int ret = 0;
- int pos = 0; /* Position of unsent part in buffer */
- int fd = -1;
- if (len == 0)
- {
- return 0;
- }
- if (BIO_get_ssl(bio, &ssl) == 1)
- {
- fd = SSL_get_fd(ssl);
- }
- while (pos < len)
- {
- int send_len = (int)len - pos;
- log_error(LOG_LEVEL_WRITING, "TLS on socket %d: %N",
- fd, 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 on socket %d over TLS/SSL failed", fd);
- 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_attr = 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;
- SSL *ssl;
- int ret = 0;
- int fd = -1;
- 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 on socket %d over TLS/SSL failed", fd);
- return -1;
- }
- if (BIO_get_ssl(bio, &ssl) == 1)
- {
- fd = SSL_get_fd(ssl);
- }
- log_error(LOG_LEVEL_RECEIVED, "TLS from socket %d: %N",
- fd, ret, buf);
- return ret;
- }
- /*********************************************************************
- *
- * Function : ssl_store_cert
- *
- * Description : This function is 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;
- #if OPENSSL_VERSION_NUMBER > 0x10100000L
- const X509_ALGOR *tsig_alg;
- #endif
- 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 %ld is larger than buffer len %lu",
- 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_puts() 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 subject 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 OPENSSL_VERSION_NUMBER > 0x10100000L
- 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 failed");
- ret = -1;
- goto exit;
- }
- #endif
- 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);
- if (encoded_text == NULL)
- {
- log_error(LOG_LEVEL_ERROR,
- "Failed to HTML-encode the certificate information");
- ret = -1;
- goto exit;
- }
- 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 OpenSSL 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;
- }
- if (csp->config->cipher_list != NULL)
- {
- if (!SSL_set_cipher_list(ssl, csp->config->cipher_list))
- {
- log_ssl_errors(LOG_LEVEL_ERROR,
- "Setting the cipher list '%s' for the client connection failed",
- csp->config->cipher_list);
- 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,
- "The TLS/SSL handshake with the client 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;
- SSL *ssl;
- 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);
- if (BIO_get_ssl(ssl_attr->openssl_attr.bio, &ssl) != 1)
- {
- log_ssl_errors(LOG_LEVEL_ERROR,
- "BIO_get_ssl() failed in close_client_ssl_connection()");
- }
- else
- {
- /*
- * Pretend we received a shutdown alert so
- * the BIO_free_all() call later on returns
- * quickly.
- */
- SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);
- }
- 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;
- SSL *ssl;
- 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);
- if (BIO_get_ssl(ssl_attr->openssl_attr.bio, &ssl) != 1)
- {
- log_ssl_errors(LOG_LEVEL_ERROR,
- "BIO_get_ssl() failed in close_server_ssl_connection()");
- }
- else
- {
- /*
- * Pretend we received a shutdown alert so
- * the BIO_free_all() call later on returns
- * quickly.
- */
- SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);
- }
- 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;
- }
- if (csp->config->cipher_list != NULL)
- {
- if (!SSL_set_cipher_list(ssl, csp->config->cipher_list))
- {
- log_ssl_errors(LOG_LEVEL_ERROR,
- "Setting the cipher list '%s' for the server connection failed",
- csp->config->cipher_list);
- ret = -1;
- goto exit;
- }
- }
- /*
- * Set the hostname to check against the received server certificate
- */
- #if OPENSSL_VERSION_NUMBER > 0x10100000L
- if (!SSL_set1_host(ssl, csp->http->host))
- {
- log_ssl_errors(LOG_LEVEL_ERROR, "SSL_set1_host failed");
- ret = -1;
- goto exit;
- }
- #else
- if (host_is_ip_address(csp->http->host))
- {
- if (X509_VERIFY_PARAM_set1_ip_asc(ssl->param, csp->http->host) != 1)
- {
- log_ssl_errors(LOG_LEVEL_ERROR,
- "X509_VERIFY_PARAM_set1_ip_asc() failed");
- ret = -1;
- goto exit;
- }
- }
- else
- {
- if (X509_VERIFY_PARAM_set1_host(ssl->param, csp->http->host, 0) != 1)
- {
- log_ssl_errors(LOG_LEVEL_ERROR,
- "X509_VERIFY_PARAM_set1_host() failed");
- ret = -1;
- goto exit;
- }
- }
- #endif
- /* 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,
- "The TLS/SSL handshake with the server 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,
- "X509 certificate verification for %s failed: %s",
- csp->http->hostport, 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 TLS/SSL errors let's report it to the log.
- */
- if (!reported)
- {
- log_error(debuglevel, "%s: no TLS/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;
- }
- if (BN_set_word(exp, RSA_KEY_PUBLIC_EXPONENT) != 1)
- {
- log_ssl_errors(LOG_LEVEL_ERROR, "Setting RSA key exponent failed");
- ret = -1;
- goto exit;
- }
- 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);
- ret = -1;
- }
- 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
- * 4 : value = extension value
- *
- * Returns : 0 => Error while setting extensuon data
- * 1 => It worked
- *
- *********************************************************************/
- static int set_x509_ext(X509 *cert, X509 *issuer, int nid, 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
- * 3 : 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_ORGANIZATION_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_ORG_UNIT_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_COUNTRY_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 public key in signed certificate failed");
- ret = -1;
- goto exit;
- }
- if (!X509_set_subject_name(cert, subject_name))
- {
- log_ssl_errors(LOG_LEVEL_ERROR,
- "Setting subject 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 before 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 Identifier 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 Name extension 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)
- {
- #ifndef OPENSSL_NO_COMP
- SSL_COMP_free_compression_methods();
- #endif
- CONF_modules_free();
- CONF_modules_unload(1);
- #ifndef OPENSSL_NO_COMP
- COMP_zlib_cleanup();
- #endif
- ERR_free_strings();
- EVP_cleanup();
- CRYPTO_cleanup_all_ex_data();
- }
- }
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