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ssl.c
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/*
* SSLsplit - transparent SSL/TLS interception
* Copyright (c) 2009-2016, Daniel Roethlisberger <daniel@roe.ch>
* All rights reserved.
* http://www.roe.ch/SSLsplit
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "ssl.h"
#include "log.h"
#include "defaults.h"
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <openssl/crypto.h>
#include <openssl/engine.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#ifndef OPENSSL_NO_DH
#include <openssl/dh.h>
#endif /* !OPENSSL_NO_DH */
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/ocsp.h>
/*
* Collection of helper functions on top of the OpenSSL API.
*/
/*
* Workaround for bug in OpenSSL 1.0.0k and 1.0.1e
* http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=703031
* http://openssl.6102.n7.nabble.com/NULL-ptr-deref-when-calling-SSL-get-certificate-with-1-0-0k-td43636.html
*/
#if (OPENSSL_VERSION_NUMBER == 0x0090819fL) || \
(OPENSSL_VERSION_NUMBER == 0x100000bfL) || \
(OPENSSL_VERSION_NUMBER == 0x1000105fL)
/*
* OpenSSL internal declarations from ssl_locl.h, reduced to what is needed.
*/
struct cert_pkey_st {
X509 *x509;
/*
EVP_PKEY *privatekey;
const EVP_MD *digest;
*/
};
struct cert_st {
struct cert_pkey_st *key;
/* ... */
};
/*
* Replacement function for SSL_get_certificate().
*/
X509 *
ssl_ssl_cert_get(SSL *s)
{
return s->cert ? s->cert->key->x509 : NULL;
}
#endif /* OpenSSL 0.9.8y, 1.0.0k or 1.0.1e */
/*
* Print OpenSSL version and build-time configuration to standard error and
* return.
*/
void
ssl_openssl_version(void)
{
fprintf(stderr, "compiled against %s (%lx)\n",
OPENSSL_VERSION_TEXT,
(long unsigned int)OPENSSL_VERSION_NUMBER);
fprintf(stderr, "rtlinked against %s (%lx)\n",
SSLeay_version(SSLEAY_VERSION),
SSLeay());
if ((OPENSSL_VERSION_NUMBER ^ SSLeay()) & 0xfffff000L) {
fprintf(stderr, "---------------------------------------"
"---------------------------------------\n");
fprintf(stderr, "WARNING: OpenSSL version mismatch may "
"lead to crashes or other problems!\n");
fprintf(stderr, "If there are multiple versions of "
"OpenSSL available, make sure to use\n");
fprintf(stderr, "the same version of the library at "
"runtime as well as for compiling against.\n");
fprintf(stderr, "---------------------------------------"
"---------------------------------------\n");
}
#ifdef LIBRESSL_VERSION_NUMBER
fprintf(stderr, "LibreSSL detected: %s (%lx)\n",
LIBRESSL_VERSION_TEXT,
(long unsigned int)LIBRESSL_VERSION_NUMBER);
#endif /* LIBRESSL_VERSION_NUMBER */
#ifdef OPENSSL_IS_BORINGSSL
fprintf(stderr, "BoringSSL detected\n")
#endif /* OPENSSL_IS_BORINGSSL */
#ifndef OPENSSL_NO_TLSEXT
fprintf(stderr, "OpenSSL has support for TLS extensions\n"
"TLS Server Name Indication (SNI) supported\n");
#else /* OPENSSL_NO_TLSEXT */
fprintf(stderr, "OpenSSL has no support for TLS extensions\n"
"TLS Server Name Indication (SNI) not supported\n");
#endif /* OPENSSL_NO_TLSEXT */
#ifdef OPENSSL_THREADS
#ifndef OPENSSL_NO_THREADID
fprintf(stderr, "OpenSSL is thread-safe with THREADID\n");
#else /* OPENSSL_NO_THREADID */
fprintf(stderr, "OpenSSL is thread-safe without THREADID\n");
#endif /* OPENSSL_NO_THREADID */
#else /* !OPENSSL_THREADS */
fprintf(stderr, "OpenSSL is not thread-safe\n");
#endif /* !OPENSSL_THREADS */
#ifdef SSL_MODE_RELEASE_BUFFERS
fprintf(stderr, "Using SSL_MODE_RELEASE_BUFFERS\n");
#else /* !SSL_MODE_RELEASE_BUFFERS */
fprintf(stderr, "Not using SSL_MODE_RELEASE_BUFFERS\n");
#endif /* !SSL_MODE_RELEASE_BUFFERS */
#if (OPENSSL_VERSION_NUMBER == 0x0090819fL) || \
(OPENSSL_VERSION_NUMBER == 0x100000bfL) || \
(OPENSSL_VERSION_NUMBER == 0x1000105fL)
fprintf(stderr, "Using direct access workaround when loading certs\n");
#endif /* OpenSSL 0.9.8y, 1.0.0k or 1.0.1e */
fprintf(stderr, "SSL/TLS protocol availability: %s\n",
SSL_PROTO_SUPPORT_S);
fprintf(stderr, "SSL/TLS algorithm availability:");
#ifndef OPENSSL_NO_RSA
fprintf(stderr, " RSA");
#else /* OPENSSL_NO_RSA */
fprintf(stderr, " !RSA");
#endif /* OPENSSL_NO_RSA */
#ifndef OPENSSL_NO_DSA
fprintf(stderr, " DSA");
#else /* OPENSSL_NO_DSA */
fprintf(stderr, " !DSA");
#endif /* OPENSSL_NO_DSA */
#ifndef OPENSSL_NO_ECDSA
fprintf(stderr, " ECDSA");
#else /* OPENSSL_NO_ECDSA */
fprintf(stderr, " !ECDSA");
#endif /* OPENSSL_NO_ECDSA */
#ifndef OPENSSL_NO_DH
fprintf(stderr, " DH");
#else /* OPENSSL_NO_DH */
fprintf(stderr, " !DH");
#endif /* OPENSSL_NO_DH */
#ifndef OPENSSL_NO_ECDH
fprintf(stderr, " ECDH");
#else /* OPENSSL_NO_ECDH */
fprintf(stderr, " !ECDH");
#endif /* OPENSSL_NO_ECDH */
#ifndef OPENSSL_NO_EC
fprintf(stderr, " EC");
#else /* OPENSSL_NO_EC */
fprintf(stderr, " !EC");
#endif /* OPENSSL_NO_EC */
fprintf(stderr, "\n");
fprintf(stderr, "OpenSSL option availability:");
#ifdef SSL_OP_NO_COMPRESSION
fprintf(stderr, " SSL_OP_NO_COMPRESSION");
#else /* !SSL_OP_NO_COMPRESSION */
fprintf(stderr, " !SSL_OP_NO_COMPRESSION");
#endif /* SSL_OP_NO_COMPRESSION */
#ifdef SSL_OP_NO_TICKET
fprintf(stderr, " SSL_OP_NO_TICKET");
#else /* !SSL_OP_NO_TICKET */
fprintf(stderr, " !SSL_OP_NO_TICKET");
#endif /* SSL_OP_NO_TICKET */
#ifdef SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION
fprintf(stderr, " SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION");
#else /* !SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION */
fprintf(stderr, " !SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION");
#endif /* !SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION */
#ifdef SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS
fprintf(stderr, " SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS");
#else /* !SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS */
fprintf(stderr, " !SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS");
#endif /* !SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS */
#ifdef SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
fprintf(stderr, " SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION");
#else /* !SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION */
fprintf(stderr, " !SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION");
#endif /* !SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION */
#ifdef SSL_OP_TLS_ROLLBACK_BUG
fprintf(stderr, " SSL_OP_TLS_ROLLBACK_BUG");
#else /* !SSL_OP_TLS_ROLLBACK_BUG */
fprintf(stderr, " !SSL_OP_TLS_ROLLBACK_BUG");
#endif /* !SSL_OP_TLS_ROLLBACK_BUG */
fprintf(stderr, "\n");
}
/*
* 1 if OpenSSL has been initialized, 0 if not. When calling a _load()
* function the first time, OpenSSL will automatically be initialized.
* Not protected by a mutex and thus not thread-safe.
*/
static int ssl_initialized = 0;
#ifdef OPENSSL_THREADS
struct CRYPTO_dynlock_value {
pthread_mutex_t mutex;
};
static pthread_mutex_t *ssl_mutex;
static int ssl_mutex_num;
/*
* OpenSSL thread-safety locking callback, #1.
*/
static void
ssl_thr_locking_cb(int mode, int type, UNUSED const char *file,
UNUSED int line) {
if (type < ssl_mutex_num) {
if (mode & CRYPTO_LOCK)
pthread_mutex_lock(&ssl_mutex[type]);
else
pthread_mutex_unlock(&ssl_mutex[type]);
}
}
/*
* OpenSSL thread-safety locking callback, #2.
*/
static struct CRYPTO_dynlock_value *
ssl_thr_dyn_create_cb(UNUSED const char *file, UNUSED int line)
{
struct CRYPTO_dynlock_value *dl;
if ((dl = malloc(sizeof(struct CRYPTO_dynlock_value)))) {
pthread_mutex_init(&dl->mutex, NULL);
}
return dl;
}
/*
* OpenSSL thread-safety locking callback, #3.
*/
static void
ssl_thr_dyn_lock_cb(int mode, struct CRYPTO_dynlock_value *dl,
UNUSED const char *file, UNUSED int line)
{
if (mode & CRYPTO_LOCK) {
pthread_mutex_lock(&dl->mutex);
} else {
pthread_mutex_unlock(&dl->mutex);
}
}
/*
* OpenSSL thread-safety locking callback, #4.
*/
static void
ssl_thr_dyn_destroy_cb(struct CRYPTO_dynlock_value *dl,
UNUSED const char *file, UNUSED int line)
{
pthread_mutex_destroy(&dl->mutex);
free(dl);
}
#ifdef OPENSSL_NO_THREADID
/*
* OpenSSL thread-safety thread ID callback, legacy version.
*/
static unsigned long
ssl_thr_id_cb(void) {
return (unsigned long) pthread_self();
}
#else /* !OPENSSL_NO_THREADID */
/*
* OpenSSL thread-safety thread ID callback, up-to-date version.
*/
static void
ssl_thr_id_cb(CRYPTO_THREADID *id)
{
CRYPTO_THREADID_set_numeric(id, (unsigned long) pthread_self());
}
#endif /* !OPENSSL_NO_THREADID */
#endif /* OPENSSL_THREADS */
/*
* Initialize OpenSSL and verify the random number generator works.
* Returns -1 on failure, 0 on success.
*/
int
ssl_init(void)
{
#ifndef PURIFY
int fd;
#endif /* !PURIFY */
char buf[256];
if (ssl_initialized)
return 0;
/* general initialization */
SSL_library_init();
#ifdef PURIFY
CRYPTO_malloc_init();
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
#endif /* PURIFY */
SSL_load_error_strings();
OpenSSL_add_all_algorithms();
/* thread-safety */
#ifdef OPENSSL_THREADS
ssl_mutex_num = CRYPTO_num_locks();
ssl_mutex = malloc(ssl_mutex_num * sizeof(*ssl_mutex));
for (int i = 0; i < ssl_mutex_num; i++) {
pthread_mutex_init(&ssl_mutex[i], NULL);
}
CRYPTO_set_locking_callback(ssl_thr_locking_cb);
CRYPTO_set_dynlock_create_callback(ssl_thr_dyn_create_cb);
CRYPTO_set_dynlock_lock_callback(ssl_thr_dyn_lock_cb);
CRYPTO_set_dynlock_destroy_callback(ssl_thr_dyn_destroy_cb);
#ifdef OPENSSL_NO_THREADID
CRYPTO_set_id_callback(ssl_thr_id_cb);
#else /* !OPENSSL_NO_THREADID */
CRYPTO_THREADID_set_callback(ssl_thr_id_cb);
#endif /* !OPENSSL_NO_THREADID */
#endif /* OPENSSL_THREADS */
/* randomness */
#ifndef PURIFY
if ((fd = open("/dev/urandom", O_RDONLY)) == -1) {
log_err_printf("Error opening /dev/urandom for reading: %s\n",
strerror(errno));
return -1;
}
while (!RAND_status()) {
if (read(fd, buf, sizeof(buf)) == -1) {
log_err_printf("Error reading from /dev/urandom: %s\n",
strerror(errno));
close(fd);
return -1;
}
RAND_seed(buf, sizeof(buf));
}
close(fd);
if (!RAND_poll()) {
log_err_printf("RAND_poll() failed.\n");
return -1;
}
#else /* PURIFY */
log_err_printf("Warning: not seeding OpenSSL RAND due to PURITY!\n");
memset(buf, 0, sizeof(buf));
while (!RAND_status()) {
RAND_seed(buf, sizeof(buf));
}
#endif /* PURIFY */
#ifdef USE_FOOTPRINT_HACKS
/* HACK: disable compression by zeroing the global comp algo stack.
* This lowers the per-connection memory footprint by ~500k. */
STACK_OF(SSL_COMP)* comp_methods = SSL_COMP_get_compression_methods();
sk_SSL_COMP_zero(comp_methods);
#endif /* USE_FOOTPRINT_HACKS */
ssl_initialized = 1;
return 0;
}
/*
* Re-initialize OpenSSL after forking.
*/
void
ssl_reinit(void)
{
if (!ssl_initialized)
return;
#ifdef OPENSSL_THREADS
for (int i = 0; i < ssl_mutex_num; i++) {
pthread_mutex_init(&ssl_mutex[i], NULL);
}
#endif /* OPENSSL_THREADS */
}
/*
* Deinitialize OpenSSL and free as much memory as possible.
* Some 10k-100k will still remain resident no matter what.
*/
void
ssl_fini(void)
{
if (!ssl_initialized)
return;
ERR_remove_state(0); /* current thread */
#ifdef OPENSSL_THREADS
CRYPTO_set_locking_callback(NULL);
CRYPTO_set_dynlock_create_callback(NULL);
CRYPTO_set_dynlock_lock_callback(NULL);
CRYPTO_set_dynlock_destroy_callback(NULL);
#ifdef OPENSSL_NO_THREADID
CRYPTO_set_id_callback(NULL);
#else /* !OPENSSL_NO_THREADID */
CRYPTO_THREADID_set_callback(NULL);
#endif /* !OPENSSL_NO_THREADID */
for (int i = 0; i < ssl_mutex_num; i++) {
pthread_mutex_destroy(&ssl_mutex[i]);
}
free(ssl_mutex);
#endif
ENGINE_cleanup();
CONF_modules_finish();
CONF_modules_unload(1);
CONF_modules_free();
EVP_cleanup();
ERR_free_strings();
CRYPTO_cleanup_all_ex_data();
}
/*
* Format raw SHA1 hash into newly allocated string, with or without colons.
*/
char *
ssl_sha1_to_str(unsigned char *rawhash, int colons)
{
char *str;
int rv;
rv = asprintf(&str, colons ?
"%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X"
"%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X" :
"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X"
"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
rawhash[ 0], rawhash[ 1], rawhash[ 2], rawhash[ 3],
rawhash[ 4], rawhash[ 5], rawhash[ 6], rawhash[ 7],
rawhash[ 8], rawhash[ 9], rawhash[10], rawhash[11],
rawhash[12], rawhash[13], rawhash[14], rawhash[15],
rawhash[16], rawhash[17], rawhash[18], rawhash[19]);
if (rv == -1)
return NULL;
return str;
}
/*
* Format SSL state into newly allocated string.
* Returns pointer to string that must be freed by caller, or NULL on error.
*/
char *
ssl_ssl_state_to_str(SSL *ssl)
{
char *str = NULL;
int rv;
rv = asprintf(&str, "%08x = %s%s%s%04x = %s (%s) [%s]",
ssl->state,
(ssl->state & SSL_ST_CONNECT) ? "SSL_ST_CONNECT|" : "",
(ssl->state & SSL_ST_ACCEPT) ? "SSL_ST_ACCEPT|" : "",
(ssl->state & SSL_ST_BEFORE) ? "SSL_ST_BEFORE|" : "",
ssl->state & SSL_ST_MASK,
SSL_state_string(ssl),
SSL_state_string_long(ssl),
(ssl->type == SSL_ST_CONNECT) ? "connect socket"
: "accept socket");
return (rv < 0) ? NULL : str;
}
#ifndef OPENSSL_NO_DH
static unsigned char dh_g[] = { 0x02 };
static unsigned char dh512_p[] = {
0xAB, 0xC0, 0x34, 0x16, 0x95, 0x8B, 0x57, 0xE5, 0x5C, 0xB3, 0x4E, 0x6E,
0x16, 0x0B, 0x35, 0xC5, 0x6A, 0xCC, 0x4F, 0xD3, 0xE5, 0x46, 0xE2, 0x23,
0x6A, 0x5B, 0xBB, 0x5D, 0x3D, 0x52, 0xEA, 0xCE, 0x4F, 0x7D, 0xCA, 0xFF,
0xB4, 0x8B, 0xC9, 0x78, 0xDC, 0xA0, 0xFC, 0xBE, 0xF3, 0xB5, 0xE6, 0x61,
0xA6, 0x6D, 0x58, 0xFC, 0xA0, 0x0F, 0xF7, 0x9B, 0x97, 0xE6, 0xC7, 0xE8,
0x1F, 0xCD, 0x16, 0x73 };
static unsigned char dh1024_p[] = {
0x99, 0x28, 0x34, 0x48, 0x9E, 0xB7, 0xD1, 0x4F, 0x0D, 0x17, 0x09, 0x97,
0xB9, 0x9B, 0x20, 0xFE, 0xE5, 0x65, 0xE0, 0xE2, 0x56, 0x37, 0x80, 0xA2,
0x9F, 0x2C, 0x2D, 0x87, 0x10, 0x58, 0x39, 0xAD, 0xF3, 0xC5, 0xA9, 0x08,
0x24, 0xC7, 0xAA, 0xA9, 0x29, 0x3A, 0x13, 0xDF, 0x4E, 0x0A, 0x6D, 0x11,
0x39, 0xB1, 0x1C, 0x3F, 0xFE, 0xFE, 0x0A, 0x5E, 0xAD, 0x2E, 0x5C, 0x10,
0x97, 0x38, 0xAC, 0xE8, 0xEB, 0xAA, 0x4A, 0xA1, 0xC0, 0x5C, 0x1D, 0x27,
0x65, 0x9C, 0xC8, 0x53, 0xAC, 0x35, 0xDD, 0x84, 0x1F, 0x47, 0x0E, 0x04,
0xF1, 0x90, 0x61, 0x62, 0x2E, 0x29, 0x2C, 0xC6, 0x28, 0x91, 0x6D, 0xF0,
0xE2, 0x5E, 0xCE, 0x60, 0x3E, 0xF7, 0xF8, 0x37, 0x99, 0x4D, 0x9F, 0xFB,
0x68, 0xEC, 0x7F, 0x9D, 0x32, 0x74, 0xD1, 0xAA, 0xD4, 0x4C, 0xF5, 0xCD,
0xC2, 0xD7, 0xD7, 0xAC, 0xDA, 0x69, 0xF5, 0x2B };
static unsigned char dh2048_p[] = {
0xAB, 0x88, 0x97, 0xCA, 0xF1, 0xE1, 0x60, 0x39, 0xFA, 0xB1, 0xA8, 0x7D,
0xB3, 0x7A, 0x38, 0x08, 0xF0, 0x7A, 0x3D, 0x21, 0xC4, 0xE6, 0xB8, 0x32,
0x3D, 0xAB, 0x0F, 0xE7, 0x8C, 0xA1, 0x59, 0x47, 0xB2, 0x0A, 0x7A, 0x3A,
0x20, 0x2A, 0x1B, 0xD4, 0xBA, 0xFC, 0x4C, 0xC5, 0xEE, 0xA2, 0xB9, 0xB9,
0x65, 0x47, 0xCC, 0x13, 0x99, 0xD7, 0xA6, 0xCA, 0xFF, 0x23, 0x05, 0x91,
0xAB, 0x5C, 0x82, 0xB8, 0xB4, 0xFD, 0xB1, 0x2E, 0x5B, 0x0F, 0x8E, 0x03,
0x3C, 0x23, 0xD6, 0x6A, 0xE2, 0x83, 0x95, 0xD2, 0x8E, 0xEB, 0xDF, 0x3A,
0xAF, 0x89, 0xF0, 0xA0, 0x14, 0x09, 0x12, 0xF6, 0x54, 0x54, 0x93, 0xF4,
0xD4, 0x41, 0x56, 0x7A, 0x0E, 0x56, 0x20, 0x1F, 0x1D, 0xBA, 0x3F, 0x07,
0xD2, 0x89, 0x1B, 0x40, 0xD0, 0x1C, 0x08, 0xDF, 0x00, 0x7F, 0x34, 0xF4,
0x28, 0x4E, 0xF7, 0x53, 0x8D, 0x4A, 0x00, 0xC3, 0xC0, 0x89, 0x9E, 0x63,
0x96, 0xE9, 0x52, 0xDF, 0xA5, 0x2C, 0x00, 0x4E, 0xB0, 0x82, 0x6A, 0x10,
0x28, 0x8D, 0xB9, 0xE7, 0x7A, 0xCB, 0xC3, 0xD6, 0xC1, 0xC0, 0x4D, 0x91,
0xC4, 0x6F, 0xD3, 0x99, 0xD1, 0x86, 0x71, 0x67, 0x0A, 0xA1, 0xFC, 0xF4,
0x7D, 0x40, 0x88, 0x8D, 0xAC, 0xCB, 0xBC, 0xEA, 0x17, 0x85, 0x0B, 0xC6,
0x12, 0x3E, 0x4A, 0xB9, 0x60, 0x74, 0x93, 0x54, 0x14, 0x39, 0x10, 0xBF,
0x21, 0xB0, 0x8B, 0xB1, 0x55, 0x3F, 0xBB, 0x6A, 0x1F, 0x42, 0x82, 0x0A,
0x40, 0x3A, 0x15, 0xCD, 0xD3, 0x79, 0xD0, 0x02, 0xA4, 0xF5, 0x79, 0x78,
0x03, 0xBD, 0x47, 0xCC, 0xD5, 0x08, 0x6A, 0x46, 0xAE, 0x36, 0xE4, 0xCD,
0xB1, 0x17, 0x48, 0x30, 0xB4, 0x02, 0xBC, 0x50, 0x68, 0xE3, 0xA2, 0x76,
0xD0, 0x5C, 0xB9, 0xE6, 0xBE, 0x4C, 0xFD, 0x50, 0xEF, 0xD0, 0x3F, 0x39,
0x4F, 0x53, 0x16, 0x3B };
static unsigned char dh4096_p[] = {
0xB1, 0xCC, 0x09, 0x86, 0xEE, 0xF9, 0xB9, 0xC9, 0xB9, 0x87, 0xC4, 0xB9,
0xD7, 0x31, 0x95, 0x84, 0x94, 0x65, 0xED, 0x82, 0x64, 0x11, 0xA7, 0x0A,
0xFE, 0xC2, 0x60, 0xAE, 0x7C, 0x74, 0xFB, 0x72, 0x8F, 0x0D, 0xA6, 0xDD,
0x02, 0x49, 0x5B, 0x69, 0xD6, 0x96, 0x05, 0xBE, 0x5E, 0x9B, 0x09, 0x83,
0xD8, 0xF3, 0x91, 0x55, 0x30, 0x86, 0x97, 0x6C, 0x48, 0x7B, 0x99, 0x82,
0xCC, 0x1E, 0x1E, 0x25, 0xE6, 0x25, 0xCC, 0xA3, 0x66, 0xDE, 0x8A, 0x78,
0xEE, 0x7F, 0x4F, 0x86, 0x95, 0x06, 0xBE, 0x64, 0x86, 0xFD, 0x60, 0x6A,
0x3F, 0x0D, 0x8F, 0x62, 0x17, 0x89, 0xDB, 0xE1, 0x01, 0xC1, 0x75, 0x3A,
0x78, 0x42, 0xA8, 0x26, 0xEC, 0x00, 0x78, 0xF3, 0xDA, 0x40, 0x8D, 0x0D,
0x4D, 0x53, 0x82, 0xD7, 0x21, 0xC8, 0x46, 0xC9, 0xE3, 0x80, 0xB4, 0xCF,
0xEA, 0x46, 0x85, 0xE9, 0xC4, 0x9D, 0xD0, 0xC0, 0x4D, 0x27, 0x0F, 0xF8,
0x34, 0x3B, 0x86, 0x8F, 0xFC, 0x40, 0x56, 0x49, 0x64, 0x76, 0x61, 0xBC,
0x35, 0x6A, 0xB8, 0xC5, 0x32, 0x19, 0x00, 0x5E, 0x21, 0x1C, 0x34, 0xCB,
0x74, 0x5B, 0x60, 0x85, 0x8C, 0x38, 0x52, 0x50, 0x4D, 0xAA, 0x25, 0xE4,
0x1A, 0xE6, 0xE4, 0xDF, 0x0A, 0xD2, 0x8F, 0x2B, 0xD1, 0x35, 0xC7, 0x92,
0x7D, 0x6F, 0x54, 0x61, 0x8E, 0x3F, 0xFB, 0xE2, 0xC8, 0x81, 0xD0, 0xAC,
0x64, 0xE2, 0xA8, 0x30, 0xEA, 0x8E, 0xAD, 0xFE, 0xC0, 0x9E, 0x0B, 0xBF,
0x34, 0xAC, 0x79, 0x96, 0x38, 0x31, 0x1E, 0xEA, 0xF2, 0x7E, 0xEE, 0x0A,
0x10, 0x34, 0x7C, 0x1A, 0x30, 0x5F, 0xAF, 0x96, 0x2F, 0x7F, 0xB5, 0x1D,
0xA7, 0x3D, 0x35, 0x7A, 0x30, 0x70, 0x40, 0xE7, 0xD6, 0x22, 0x1E, 0xD0,
0x9A, 0x34, 0xC7, 0x6B, 0xE4, 0xF1, 0x78, 0xED, 0xD9, 0xCD, 0x18, 0xBF,
0x2A, 0x1A, 0x98, 0xB7, 0x6C, 0x6E, 0x18, 0x40, 0xB5, 0xBE, 0xDF, 0xE4,
0x78, 0x8E, 0x34, 0xB2, 0x7B, 0xE5, 0x88, 0xE6, 0xFD, 0x24, 0xBD, 0xBB,
0x2E, 0x30, 0x72, 0x54, 0xC7, 0xF4, 0xA0, 0xF1, 0x25, 0xFF, 0xB1, 0x37,
0x42, 0x07, 0x8C, 0xF2, 0xB9, 0xA1, 0xA4, 0xA7, 0x76, 0x39, 0xB8, 0x11,
0x17, 0xF3, 0xA8, 0x2E, 0x78, 0x68, 0xF4, 0xBF, 0x98, 0x25, 0x59, 0x17,
0x59, 0x9B, 0x0D, 0x0B, 0x9B, 0xE3, 0x0F, 0xFF, 0xDC, 0xC8, 0x47, 0x21,
0xE1, 0x0B, 0x9A, 0x44, 0x79, 0xC7, 0x5F, 0x8E, 0x83, 0x1E, 0x04, 0xA1,
0xB2, 0x9F, 0x9B, 0xFC, 0xB3, 0x4E, 0xD9, 0xF9, 0x8F, 0x03, 0xBC, 0x0A,
0x04, 0x00, 0x5C, 0x59, 0xB7, 0x51, 0xAA, 0x75, 0xF8, 0x7A, 0x03, 0x07,
0x81, 0x6D, 0x67, 0x3E, 0x28, 0x37, 0xE4, 0x74, 0x5B, 0x8C, 0x2A, 0x4B,
0x6C, 0x10, 0x92, 0x75, 0xA5, 0x79, 0x4B, 0x6D, 0x30, 0xB7, 0x6E, 0xD6,
0x9E, 0x16, 0xC2, 0x87, 0x69, 0x34, 0xFE, 0xD7, 0x2A, 0x4F, 0xD6, 0xC0,
0xF3, 0xCD, 0x9C, 0x46, 0xED, 0xC0, 0xB2, 0x84, 0x8D, 0x7E, 0x93, 0xD2,
0xE9, 0xBE, 0x59, 0x18, 0x92, 0xC1, 0x2C, 0xD6, 0x6C, 0x71, 0x50, 0xA1,
0x98, 0xDA, 0xD1, 0xAC, 0xDB, 0x88, 0x40, 0x1F, 0x69, 0xDC, 0xDB, 0xB2,
0xA0, 0x90, 0x01, 0x8E, 0x12, 0xD6, 0x40, 0x1A, 0x8E, 0xC5, 0x69, 0x9C,
0x91, 0x67, 0xAC, 0xD8, 0x4C, 0x27, 0xCD, 0x08, 0xB8, 0x32, 0x97, 0xE1,
0x13, 0x0C, 0xFF, 0xB1, 0x06, 0x65, 0x03, 0x98, 0x6F, 0x9E, 0xF7, 0xB8,
0xA8, 0x75, 0xBA, 0x59, 0xFD, 0x23, 0x98, 0x94, 0x80, 0x9C, 0xA7, 0x46,
0x32, 0x98, 0x28, 0x7A, 0x0A, 0x3A, 0xA6, 0x95, 0x16, 0x6A, 0x52, 0x8E,
0x8F, 0x2C, 0xC9, 0x49, 0xB7, 0x59, 0x99, 0x2A, 0xE6, 0xCA, 0x82, 0x88,
0x36, 0xD3, 0x2B, 0xA4, 0x73, 0xFA, 0x89, 0xBB,
};
/*
* OpenSSL temporary DH callback which loads DH parameters from static memory.
*/
DH *
ssl_tmp_dh_callback(UNUSED SSL *s, int is_export, int keylength)
{
DH *dh;
if (!(dh = DH_new())) {
log_err_printf("DH_new() failed\n");
return NULL;
}
switch (keylength) {
case 512:
dh->p = BN_bin2bn(dh512_p, sizeof(dh512_p), NULL);
break;
case 1024:
dh->p = BN_bin2bn(dh1024_p, sizeof(dh1024_p), NULL);
break;
case 2048:
dh->p = BN_bin2bn(dh2048_p, sizeof(dh2048_p), NULL);
break;
case 4096:
dh->p = BN_bin2bn(dh4096_p, sizeof(dh4096_p), NULL);
break;
default:
log_err_printf("Unhandled DH keylength %i%s\n",
keylength,
(is_export ? " (export)" : ""));
DH_free(dh);
return NULL;
}
dh->g = BN_bin2bn(dh_g, sizeof(dh_g), NULL);
if (!dh->p || !dh->g) {
log_err_printf("Failed to load DH p and g from memory\n");
DH_free(dh);
return NULL;
}
return(dh);
}
/*
* Load DH parameters from a PEM file.
* Not thread-safe.
*/
DH *
ssl_dh_load(const char *filename)
{
DH *dh;
FILE *fh;
if (ssl_init() == -1)
return NULL;
if (!(fh = fopen(filename, "r"))) {
return NULL;
}
dh = PEM_read_DHparams(fh, NULL, NULL, NULL);
fclose(fh);
return dh;
}
#endif /* !OPENSSL_NO_DH */
#ifndef OPENSSL_NO_EC
/*
* Load an Elliptic Curve by name. If curvename is NULL, a default curve is
* loaded.
*/
EC_KEY *
ssl_ec_by_name(const char *curvename)
{
int nid;
if (!curvename)
curvename = DFLT_CURVE;
if ((nid = OBJ_sn2nid(curvename)) == NID_undef) {
return NULL;
}
return EC_KEY_new_by_curve_name(nid);
}
#endif /* !OPENSSL_NO_EC */
/*
* Add a X509v3 extension to a certificate and handle errors.
* Returns -1 on errors, 0 on success.
*/
int
ssl_x509_v3ext_add(X509V3_CTX *ctx, X509 *crt, char *k, char *v)
{
X509_EXTENSION *ext;
if (!(ext = X509V3_EXT_conf(NULL, ctx, k, v))) {
return -1;
}
if (X509_add_ext(crt, ext, -1) != 1) {
X509_EXTENSION_free(ext);
return -1;
}
X509_EXTENSION_free(ext);
return 0;
}
/*
* Copy a X509v3 extension from one certificate to another.
* If the extension is not present in the original certificate,
* the extension will not be added to the destination certificate.
* Returns 1 if ext was copied, 0 if not present in origcrt, -1 on error.
*/
int
ssl_x509_v3ext_copy_by_nid(X509 *crt, X509 *origcrt, int nid)
{
X509_EXTENSION *ext;
int pos;
pos = X509_get_ext_by_NID(origcrt, nid, -1);
if (pos == -1)
return 0;
ext = X509_get_ext(origcrt, pos);
if (!ext)
return -1;
if (X509_add_ext(crt, ext, -1) != 1)
return -1;
return 1;
}
/*
* Best effort randomness generator.
* Not for real life cryptography applications.
* Returns 0 on success, -1 on failure.
*/
int
ssl_rand(void *p, size_t sz)
{
int rv;
rv = RAND_pseudo_bytes((unsigned char*)p, sz);
if (rv == -1) {
rv = RAND_bytes((unsigned char*)p, sz);
if (rv != 1)
return -1;
}
return 0;
}
/*
* Copy the serial number from src certificate to dst certificate
* and modify it by a random offset.
* If reading the serial fails for some reason, generate a new
* random serial and store it in the dst certificate.
* Using the same serial is not a good idea since some SSL stacks
* check for duplicate certificate serials.
* Returns 0 on success, -1 on error.
*/
int
ssl_x509_serial_copyrand(X509 *dstcrt, X509 *srccrt)
{
ASN1_INTEGER *srcptr, *dstptr;
BIGNUM *bnserial;
unsigned int rand;
int rv;
#ifndef PURIFY
rv = ssl_rand(&rand, sizeof(rand));
#else /* PURIFY */
rand = 0xF001;
rv = 0;
#endif /* PURIFY */
dstptr = X509_get_serialNumber(dstcrt);
srcptr = X509_get_serialNumber(srccrt);
if ((rv == -1) || !dstptr || !srcptr)
return -1;
bnserial = ASN1_INTEGER_to_BN(srcptr, NULL);
if (!bnserial) {
/* random 32-bit serial */
ASN1_INTEGER_set(dstptr, rand);
} else {
/* original serial plus random 32-bit offset */
BN_add_word(bnserial, rand);
BN_to_ASN1_INTEGER(bnserial, dstptr);
BN_free(bnserial);
}
return 0;
}
/*
* Create a fake X509v3 certificate, signed by the provided CA,
* based on the original certificate retrieved from the real server.
* The returned certificate is created using X509_new() and thus must
* be freed by the caller using X509_free().
* The optional argument extraname is added to subjectAltNames if provided.
*/
X509 *
ssl_x509_forge(X509 *cacrt, EVP_PKEY *cakey, X509 *origcrt,
const char *extraname, EVP_PKEY *key)
{
X509_NAME *subject, *issuer;
GENERAL_NAMES *names;
GENERAL_NAME *gn;
X509 *crt;
subject = X509_get_subject_name(origcrt);
issuer = X509_get_subject_name(cacrt);
if (!subject || !issuer)
return NULL;
crt = X509_new();
if (!crt)
return NULL;
if (!X509_set_version(crt, 0x02) ||
!X509_set_subject_name(crt, subject) ||
!X509_set_issuer_name(crt, issuer) ||
ssl_x509_serial_copyrand(crt, origcrt) == -1 ||
!X509_gmtime_adj(X509_get_notBefore(crt), (long)-60*60*24) ||
!X509_gmtime_adj(X509_get_notAfter(crt), (long)60*60*24*364) ||
!X509_set_pubkey(crt, key))
goto errout;
/* add standard v3 extensions; cf. RFC 2459 */
X509V3_CTX ctx;
X509V3_set_ctx(&ctx, cacrt, crt, NULL, NULL, 0);
if (ssl_x509_v3ext_add(&ctx, crt, "basicConstraints",
"CA:FALSE") == -1 ||
ssl_x509_v3ext_add(&ctx, crt, "keyUsage",
"digitalSignature,"
"keyEncipherment") == -1 ||
ssl_x509_v3ext_add(&ctx, crt, "extendedKeyUsage",
"serverAuth") == -1 ||
ssl_x509_v3ext_add(&ctx, crt, "subjectKeyIdentifier",
"hash") == -1 ||
ssl_x509_v3ext_add(&ctx, crt, "authorityKeyIdentifier",
"keyid,issuer:always") == -1)
goto errout;
if (!extraname) {
/* no extraname provided: copy original subjectAltName ext */
if (ssl_x509_v3ext_copy_by_nid(crt, origcrt,
NID_subject_alt_name) == -1)
goto errout;
} else {
names = X509_get_ext_d2i(origcrt, NID_subject_alt_name, 0, 0);
if (!names) {
/* no subjectAltName present: add new one */
char *cfval;
if (asprintf(&cfval, "DNS:%s", extraname) < 0)
goto errout;
if (ssl_x509_v3ext_add(&ctx, crt, "subjectAltName",
cfval) == -1) {
free(cfval);
goto errout;
}
free(cfval);
} else {
/* add extraname to original subjectAltName
* and add it to the new certificate */
gn = GENERAL_NAME_new();
if (!gn)
goto errout2;
gn->type = GEN_DNS;
gn->d.dNSName = M_ASN1_IA5STRING_new();
if (!gn->d.dNSName)
goto errout3;
ASN1_STRING_set(gn->d.dNSName,
(unsigned char *)extraname,
strlen(extraname));
sk_GENERAL_NAME_push(names, gn);
X509_EXTENSION *ext = X509V3_EXT_i2d(
NID_subject_alt_name, 0, names);
if (!X509_add_ext(crt, ext, -1)) {
if (ext) {
X509_EXTENSION_free(ext);
}
goto errout3;
}
X509_EXTENSION_free(ext);
sk_GENERAL_NAME_pop_free(names, GENERAL_NAME_free);
}
}
#ifdef DEBUG_CERTIFICATE
ssl_x509_v3ext_add(&ctx, crt, "nsComment", "Generated by " PNAME);
#endif /* DEBUG_CERTIFICATE */
const EVP_MD *md;
switch (EVP_PKEY_type(cakey->type)) {
#ifndef OPENSSL_NO_RSA
case EVP_PKEY_RSA:
switch (OBJ_obj2nid(origcrt->sig_alg->algorithm)) {
case NID_md5WithRSAEncryption:
md = EVP_md5();
break;
case NID_ripemd160WithRSA:
md = EVP_ripemd160();
break;
case NID_sha224WithRSAEncryption:
md = EVP_sha224();
break;
case NID_sha256WithRSAEncryption:
md = EVP_sha256();
break;
case NID_sha384WithRSAEncryption:
md = EVP_sha384();
break;
case NID_sha512WithRSAEncryption:
md = EVP_sha512();
break;
case NID_shaWithRSAEncryption:
case NID_sha1WithRSAEncryption:
default:
md = EVP_sha1();
break;
}
break;
#endif /* !OPENSSL_NO_RSA */
#ifndef OPENSSL_NO_DSA
case EVP_PKEY_DSA:
md = EVP_dss1();
break;
#endif /* !OPENSSL_NO_DSA */
#ifndef OPENSSL_NO_ECDSA
case EVP_PKEY_EC:
md = EVP_ecdsa();
break;
#endif /* !OPENSSL_NO_ECDSA */
default:
goto errout;
}
if (!X509_sign(crt, cakey, md))
goto errout;
return crt;
errout3:
GENERAL_NAME_free(gn);
errout2:
sk_GENERAL_NAME_pop_free(names, GENERAL_NAME_free);
errout:
X509_free(crt);
return NULL;
}
/*
* Load a X509 certificate chain from a PEM file.
* Returns the first certificate in *crt and all subsequent certificates in
* *chain. If crt is NULL, the first certificate is prepended to *chain
* instead of returned separately. If *chain is NULL, a new stack of X509*
* is created in *chain, else the certs are pushed onto an existing stack.
* Returns -1 on error.
* Not thread-safe.
*
* By accessing (SSLCTX*)->extra_certs directly on OpenSSL before 1.0.2, we
* depend on OpenSSL internals in this function. OpenSSL 1.0.2 introduced
* the SSL_get0_chain_certs() API for accessing the certificate chain.
*/
int
ssl_x509chain_load(X509 **crt, STACK_OF(X509) **chain, const char *filename)
{
X509 *tmpcrt;
SSL_CTX *tmpctx;
SSL *tmpssl;
STACK_OF(X509) *tmpchain;
int rv;
if (ssl_init() == -1)
return -1;
tmpctx = SSL_CTX_new(SSLv23_server_method());
if (!tmpctx)
goto leave1;
rv = SSL_CTX_use_certificate_chain_file(tmpctx, filename);
if (rv != 1)
goto leave2;
tmpssl = SSL_new(tmpctx);
if (!tmpssl)
goto leave2;
tmpcrt = SSL_get_certificate(tmpssl);
if (!tmpcrt)
goto leave3;
if (!*chain) {
*chain = sk_X509_new_null();
if (!*chain)
goto leave3;
}
#if (OPENSSL_VERSION_NUMBER < 0x1000200fL) || defined(LIBRESSL_VERSION_NUMBER)
tmpchain = tmpctx->extra_certs;
#else /* OpenSSL >= 1.0.2 */
rv = SSL_CTX_get0_chain_certs(tmpctx, &tmpchain);
if (rv != 1)
goto leave3;
#endif /* OpenSSL >= 1.0.2 */
if (crt) {
*crt = tmpcrt;
} else {
sk_X509_push(*chain, tmpcrt);
}
ssl_x509_refcount_inc(tmpcrt);
for (int i = 0; i < sk_X509_num(tmpchain); i++) {
tmpcrt = sk_X509_value(tmpchain, i);
ssl_x509_refcount_inc(tmpcrt);
sk_X509_push(*chain, tmpcrt);
}
SSL_free(tmpssl);
SSL_CTX_free(tmpctx);
return 0;
leave3:
SSL_free(tmpssl);
leave2:
SSL_CTX_free(tmpctx);
leave1:
return -1;