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[tor-commits] [tor/maint-0.3.5] Merge branch 'maint-0.3.4' into maint-0.3.5



commit ae4c94bb6468078ba16de481991e781e1b486340
Merge: 896d0ebb9 42be1c668
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date:   Tue Nov 13 08:27:29 2018 -0500

    Merge branch 'maint-0.3.4' into maint-0.3.5

 changes/bug28413                | 4 ++++
 src/lib/crypt_ops/aes_openssl.c | 4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --cc src/lib/crypt_ops/aes_openssl.c
index f2990fc06,000000000..ac275af33
mode 100644,000000..100644
--- a/src/lib/crypt_ops/aes_openssl.c
+++ b/src/lib/crypt_ops/aes_openssl.c
@@@ -1,410 -1,0 +1,410 @@@
 +/* Copyright (c) 2001, Matej Pfajfar.
 + * Copyright (c) 2001-2004, Roger Dingledine.
 + * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
 + * Copyright (c) 2007-2018, The Tor Project, Inc. */
 +/* See LICENSE for licensing information */
 +
 +/**
 + * \file aes_openssl.c
 + * \brief Use OpenSSL to implement AES_CTR.
 + **/
 +
 +#include "orconfig.h"
 +#include "lib/crypt_ops/aes.h"
 +#include "lib/crypt_ops/crypto_util.h"
 +#include "lib/log/util_bug.h"
 +#include "lib/arch/bytes.h"
 +
 +#ifdef _WIN32 /*wrkard for dtls1.h >= 0.9.8m of "#include <winsock.h>"*/
 +  #include <winsock2.h>
 +  #include <ws2tcpip.h>
 +#endif
 +
 +#include "lib/crypt_ops/compat_openssl.h"
 +#include <openssl/opensslv.h>
 +#include "lib/crypt_ops/crypto_openssl_mgt.h"
 +
 +#if OPENSSL_VERSION_NUMBER < OPENSSL_V_SERIES(1,0,0)
 +#error "We require OpenSSL >= 1.0.0"
 +#endif
 +
 +DISABLE_GCC_WARNING(redundant-decls)
 +
 +#include <stdlib.h>
 +#include <string.h>
 +#include <openssl/aes.h>
 +#include <openssl/evp.h>
 +#include <openssl/engine.h>
 +#include <openssl/modes.h>
 +
 +ENABLE_GCC_WARNING(redundant-decls)
 +
 +#include "lib/crypt_ops/aes.h"
 +#include "lib/log/log.h"
 +#include "lib/ctime/di_ops.h"
 +
 +#ifdef ANDROID
 +/* Android's OpenSSL seems to have removed all of its Engine support. */
 +#define DISABLE_ENGINES
 +#endif
 +
 +/* We have five strategies for implementing AES counter mode.
 + *
 + * Best with x86 and x86_64: Use EVP_aes_*_ctr() and EVP_EncryptUpdate().
 + * This is possible with OpenSSL 1.0.1, where the counter-mode implementation
 + * can use bit-sliced or vectorized AES or AESNI as appropriate.
 + *
 + * Otherwise: Pick the best possible AES block implementation that OpenSSL
 + * gives us, and the best possible counter-mode implementation, and combine
 + * them.
 + */
 +#if OPENSSL_VERSION_NUMBER >= OPENSSL_V_NOPATCH(1,1,0)
 +
 +/* With newer OpenSSL versions, the older fallback modes don't compile.  So
 + * don't use them, even if we lack specific acceleration. */
 +
 +#define USE_EVP_AES_CTR
 +
 +#elif OPENSSL_VERSION_NUMBER >= OPENSSL_V_NOPATCH(1,0,1) &&               \
 +  (defined(__i386) || defined(__i386__) || defined(_M_IX86) ||          \
 +   defined(__x86_64) || defined(__x86_64__) ||                          \
 +   defined(_M_AMD64) || defined(_M_X64) || defined(__INTEL__))
 +
 +#define USE_EVP_AES_CTR
 +
 +#endif /* OPENSSL_VERSION_NUMBER >= OPENSSL_V_NOPATCH(1,1,0) || ... */
 +
 +/* We have 2 strategies for getting the AES block cipher: Via OpenSSL's
 + * AES_encrypt function, or via OpenSSL's EVP_EncryptUpdate function.
 + *
 + * If there's any hardware acceleration in play, we want to be using EVP_* so
 + * we can get it.  Otherwise, we'll want AES_*, which seems to be about 5%
 + * faster than indirecting through the EVP layer.
 + */
 +
 +/* We have 2 strategies for getting a plug-in counter mode: use our own, or
 + * use OpenSSL's.
 + *
 + * Here we have a counter mode that's faster than the one shipping with
 + * OpenSSL pre-1.0 (by about 10%!).  But OpenSSL 1.0.0 added a counter mode
 + * implementation faster than the one here (by about 7%).  So we pick which
 + * one to used based on the Openssl version above.  (OpenSSL 1.0.0a fixed a
 + * critical bug in that counter mode implementation, so we need to test to
 + * make sure that we have a fixed version.)
 + */
 +
 +#ifdef USE_EVP_AES_CTR
 +
 +/* We don't actually define the struct here. */
 +
 +aes_cnt_cipher_t *
 +aes_new_cipher(const uint8_t *key, const uint8_t *iv, int key_bits)
 +{
 +  EVP_CIPHER_CTX *cipher = EVP_CIPHER_CTX_new();
-   const EVP_CIPHER *c;
++  const EVP_CIPHER *c = NULL;
 +  switch (key_bits) {
 +    case 128: c = EVP_aes_128_ctr(); break;
 +    case 192: c = EVP_aes_192_ctr(); break;
 +    case 256: c = EVP_aes_256_ctr(); break;
-     default: tor_assert(0); // LCOV_EXCL_LINE
++    default: tor_assert_unreached(); // LCOV_EXCL_LINE
 +  }
 +  EVP_EncryptInit(cipher, c, key, iv);
 +  return (aes_cnt_cipher_t *) cipher;
 +}
 +void
 +aes_cipher_free_(aes_cnt_cipher_t *cipher_)
 +{
 +  if (!cipher_)
 +    return;
 +  EVP_CIPHER_CTX *cipher = (EVP_CIPHER_CTX *) cipher_;
 +#ifdef OPENSSL_1_1_API
 +  EVP_CIPHER_CTX_reset(cipher);
 +#else
 +  EVP_CIPHER_CTX_cleanup(cipher);
 +#endif
 +  EVP_CIPHER_CTX_free(cipher);
 +}
 +void
 +aes_crypt_inplace(aes_cnt_cipher_t *cipher_, char *data, size_t len)
 +{
 +  int outl;
 +  EVP_CIPHER_CTX *cipher = (EVP_CIPHER_CTX *) cipher_;
 +
 +  tor_assert(len < INT_MAX);
 +
 +  EVP_EncryptUpdate(cipher, (unsigned char*)data,
 +                    &outl, (unsigned char*)data, (int)len);
 +}
 +int
 +evaluate_evp_for_aes(int force_val)
 +{
 +  (void) force_val;
 +  log_info(LD_CRYPTO, "This version of OpenSSL has a known-good EVP "
 +           "counter-mode implementation. Using it.");
 +  return 0;
 +}
 +int
 +evaluate_ctr_for_aes(void)
 +{
 +  return 0;
 +}
 +#else /* !(defined(USE_EVP_AES_CTR)) */
 +
 +/*======================================================================*/
 +/* Interface to AES code, and counter implementation */
 +
 +/** Implements an AES counter-mode cipher. */
 +struct aes_cnt_cipher {
 +/** This next element (however it's defined) is the AES key. */
 +  union {
 +    EVP_CIPHER_CTX evp;
 +    AES_KEY aes;
 +  } key;
 +
 +#if !defined(WORDS_BIGENDIAN)
 +#define USING_COUNTER_VARS
 +  /** These four values, together, implement a 128-bit counter, with
 +   * counter0 as the low-order word and counter3 as the high-order word. */
 +  uint32_t counter3;
 +  uint32_t counter2;
 +  uint32_t counter1;
 +  uint32_t counter0;
 +#endif /* !defined(WORDS_BIGENDIAN) */
 +
 +  union {
 +    /** The counter, in big-endian order, as bytes. */
 +    uint8_t buf[16];
 +    /** The counter, in big-endian order, as big-endian words.  Note that
 +     * on big-endian platforms, this is redundant with counter3...0,
 +     * so we just use these values instead. */
 +    uint32_t buf32[4];
 +  } ctr_buf;
 +
 +  /** The encrypted value of ctr_buf. */
 +  uint8_t buf[16];
 +  /** Our current stream position within buf. */
 +  unsigned int pos;
 +
 +  /** True iff we're using the evp implementation of this cipher. */
 +  uint8_t using_evp;
 +};
 +
 +/** True iff we should prefer the EVP implementation for AES, either because
 + * we're testing it or because we have hardware acceleration configured */
 +static int should_use_EVP = 0;
 +
 +/** Check whether we should use the EVP interface for AES. If <b>force_val</b>
 + * is nonnegative, we use use EVP iff it is true.  Otherwise, we use EVP
 + * if there is an engine enabled for aes-ecb. */
 +int
 +evaluate_evp_for_aes(int force_val)
 +{
 +  ENGINE *e;
 +
 +  if (force_val >= 0) {
 +    should_use_EVP = force_val;
 +    return 0;
 +  }
 +#ifdef DISABLE_ENGINES
 +  should_use_EVP = 0;
 +#else
 +  e = ENGINE_get_cipher_engine(NID_aes_128_ecb);
 +
 +  if (e) {
 +    log_info(LD_CRYPTO, "AES engine \"%s\" found; using EVP_* functions.",
 +               ENGINE_get_name(e));
 +    should_use_EVP = 1;
 +  } else {
 +    log_info(LD_CRYPTO, "No AES engine found; using AES_* functions.");
 +    should_use_EVP = 0;
 +  }
 +#endif /* defined(DISABLE_ENGINES) */
 +
 +  return 0;
 +}
 +
 +/** Test the OpenSSL counter mode implementation to see whether it has the
 + * counter-mode bug from OpenSSL 1.0.0. If the implementation works, then
 + * we will use it for future encryption/decryption operations.
 + *
 + * We can't just look at the OpenSSL version, since some distributions update
 + * their OpenSSL packages without changing the version number.
 + **/
 +int
 +evaluate_ctr_for_aes(void)
 +{
 +  /* Result of encrypting an all-zero block with an all-zero 128-bit AES key.
 +   * This should be the same as encrypting an all-zero block with an all-zero
 +   * 128-bit AES key in counter mode, starting at position 0 of the stream.
 +   */
 +  static const unsigned char encrypt_zero[] =
 +    "\x66\xe9\x4b\xd4\xef\x8a\x2c\x3b\x88\x4c\xfa\x59\xca\x34\x2b\x2e";
 +  unsigned char zero[16];
 +  unsigned char output[16];
 +  unsigned char ivec[16];
 +  unsigned char ivec_tmp[16];
 +  unsigned int pos, i;
 +  AES_KEY key;
 +  memset(zero, 0, sizeof(zero));
 +  memset(ivec, 0, sizeof(ivec));
 +  AES_set_encrypt_key(zero, 128, &key);
 +
 +  pos = 0;
 +  /* Encrypting a block one byte at a time should make the error manifest
 +   * itself for known bogus openssl versions. */
 +  for (i=0; i<16; ++i)
 +    AES_ctr128_encrypt(&zero[i], &output[i], 1, &key, ivec, ivec_tmp, &pos);
 +
 +  if (fast_memneq(output, encrypt_zero, 16)) {
 +    /* Counter mode is buggy */
 +    /* LCOV_EXCL_START */
 +    log_err(LD_CRYPTO, "This OpenSSL has a buggy version of counter mode; "
 +                  "quitting tor.");
 +    exit(1); // exit ok: openssl is broken.
 +    /* LCOV_EXCL_STOP */
 +  }
 +  return 0;
 +}
 +
 +#if !defined(USING_COUNTER_VARS)
 +#define COUNTER(c, n) ((c)->ctr_buf.buf32[3-(n)])
 +#else
 +#define COUNTER(c, n) ((c)->counter ## n)
 +#endif
 +
 +static void aes_set_key(aes_cnt_cipher_t *cipher, const uint8_t *key,
 +                        int key_bits);
 +static void aes_set_iv(aes_cnt_cipher_t *cipher, const uint8_t *iv);
 +
 +/**
 + * Return a newly allocated counter-mode AES128 cipher implementation,
 + * using the 128-bit key <b>key</b> and the 128-bit IV <b>iv</b>.
 + */
 +aes_cnt_cipher_t*
 +aes_new_cipher(const uint8_t *key, const uint8_t *iv, int bits)
 +{
 +  aes_cnt_cipher_t* result = tor_malloc_zero(sizeof(aes_cnt_cipher_t));
 +
 +  aes_set_key(result, key, bits);
 +  aes_set_iv(result, iv);
 +
 +  return result;
 +}
 +
 +/** Set the key of <b>cipher</b> to <b>key</b>, which is
 + * <b>key_bits</b> bits long (must be 128, 192, or 256).  Also resets
 + * the counter to 0.
 + */
 +static void
 +aes_set_key(aes_cnt_cipher_t *cipher, const uint8_t *key, int key_bits)
 +{
 +  if (should_use_EVP) {
 +    const EVP_CIPHER *c = 0;
 +    switch (key_bits) {
 +      case 128: c = EVP_aes_128_ecb(); break;
 +      case 192: c = EVP_aes_192_ecb(); break;
 +      case 256: c = EVP_aes_256_ecb(); break;
 +      default: tor_assert(0); // LCOV_EXCL_LINE
 +    }
 +    EVP_EncryptInit(&cipher->key.evp, c, key, NULL);
 +    cipher->using_evp = 1;
 +  } else {
 +    AES_set_encrypt_key(key, key_bits,&cipher->key.aes);
 +    cipher->using_evp = 0;
 +  }
 +
 +#ifdef USING_COUNTER_VARS
 +  cipher->counter0 = 0;
 +  cipher->counter1 = 0;
 +  cipher->counter2 = 0;
 +  cipher->counter3 = 0;
 +#endif /* defined(USING_COUNTER_VARS) */
 +
 +  memset(cipher->ctr_buf.buf, 0, sizeof(cipher->ctr_buf.buf));
 +
 +  cipher->pos = 0;
 +
 +  memset(cipher->buf, 0, sizeof(cipher->buf));
 +}
 +
 +/** Release storage held by <b>cipher</b>
 + */
 +void
 +aes_cipher_free_(aes_cnt_cipher_t *cipher)
 +{
 +  if (!cipher)
 +    return;
 +  if (cipher->using_evp) {
 +    EVP_CIPHER_CTX_cleanup(&cipher->key.evp);
 +  }
 +  memwipe(cipher, 0, sizeof(aes_cnt_cipher_t));
 +  tor_free(cipher);
 +}
 +
 +#if defined(USING_COUNTER_VARS)
 +#define UPDATE_CTR_BUF(c, n) STMT_BEGIN                 \
 +  (c)->ctr_buf.buf32[3-(n)] = htonl((c)->counter ## n); \
 +  STMT_END
 +#else
 +#define UPDATE_CTR_BUF(c, n)
 +#endif /* defined(USING_COUNTER_VARS) */
 +
 +/* Helper function to use EVP with openssl's counter-mode wrapper. */
 +static void
 +evp_block128_fn(const uint8_t in[16],
 +                uint8_t out[16],
 +                const void *key)
 +{
 +  EVP_CIPHER_CTX *ctx = (void*)key;
 +  int inl=16, outl=16;
 +  EVP_EncryptUpdate(ctx, out, &outl, in, inl);
 +}
 +
 +/** Encrypt <b>len</b> bytes from <b>input</b>, storing the results in place.
 + * Uses the key in <b>cipher</b>, and advances the counter by <b>len</b> bytes
 + * as it encrypts.
 + */
 +void
 +aes_crypt_inplace(aes_cnt_cipher_t *cipher, char *data, size_t len)
 +{
 +  /* Note that the "128" below refers to the length of the counter,
 +   * not the length of the AES key. */
 +  if (cipher->using_evp) {
 +    /* In openssl 1.0.0, there's an if'd out EVP_aes_128_ctr in evp.h.  If
 +     * it weren't disabled, it might be better just to use that.
 +     */
 +    CRYPTO_ctr128_encrypt((const unsigned char *)data,
 +                          (unsigned char *)data,
 +                          len,
 +                          &cipher->key.evp,
 +                          cipher->ctr_buf.buf,
 +                          cipher->buf,
 +                          &cipher->pos,
 +                          evp_block128_fn);
 +  } else {
 +    AES_ctr128_encrypt((const unsigned char *)data,
 +                       (unsigned char *)data,
 +                       len,
 +                       &cipher->key.aes,
 +                       cipher->ctr_buf.buf,
 +                       cipher->buf,
 +                       &cipher->pos);
 +  }
 +}
 +
 +/** Reset the 128-bit counter of <b>cipher</b> to the 16-bit big-endian value
 + * in <b>iv</b>. */
 +static void
 +aes_set_iv(aes_cnt_cipher_t *cipher, const uint8_t *iv)
 +{
 +#ifdef USING_COUNTER_VARS
 +  cipher->counter3 = tor_ntohl(get_uint32(iv));
 +  cipher->counter2 = tor_ntohl(get_uint32(iv+4));
 +  cipher->counter1 = tor_ntohl(get_uint32(iv+8));
 +  cipher->counter0 = tor_ntohl(get_uint32(iv+12));
 +#endif /* defined(USING_COUNTER_VARS) */
 +  cipher->pos = 0;
 +  memcpy(cipher->ctr_buf.buf, iv, 16);
 +}
 +
 +#endif /* defined(USE_EVP_AES_CTR) */

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