text: /* Copyright (c) 2017, Google Inc.
   *
   * Permission to use, copy, modify, and/or distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
   * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
   * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
   * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
  
  #if !defined(_GNU_SOURCE)
  #define _GNU_SOURCE  // needed for syscall() on Linux.
  #endif
  
  #include <openssl/crypto.h>
  
  #include <stdlib.h>
  #if defined(BORINGSSL_FIPS)
  #include <sys/mman.h>
  #include <unistd.h>
  #endif
  
  #include <openssl/digest.h>
  #include <openssl/hmac.h>
  #include <openssl/sha.h>
  
  #include "../internal.h"
  
  #include "aes/aes.c"
  #include "aes/aes_nohw.c"
  #include "aes/key_wrap.c"
  #include "aes/mode_wrappers.c"
  #include "bn/add.c"
  #include "bn/asm/x86_64-gcc.c"
  #include "bn/bn.c"
  #include "bn/bytes.c"
  #include "bn/cmp.c"
  #include "bn/ctx.c"
  #include "bn/div.c"
  #include "bn/div_extra.c"
  #include "bn/exponentiation.c"
  #include "bn/gcd.c"
  #include "bn/gcd_extra.c"
  #include "bn/generic.c"
  #include "bn/jacobi.c"
  #include "bn/montgomery.c"
  #include "bn/montgomery_inv.c"
  #include "bn/mul.c"
  #include "bn/prime.c"
  #include "bn/random.c"
  #include "bn/rsaz_exp.c"
  #include "bn/shift.c"
  #include "bn/sqrt.c"
  #include "cipher/aead.c"
  #include "cipher/cipher.c"
  #include "cipher/e_aes.c"
  #include "dh/check.c"
  #include "dh/dh.c"
  #include "digest/digest.c"
  #include "digest/digests.c"
  #include "ecdh/ecdh.c"
  #include "ecdsa/ecdsa.c"
  #include "ec/ec.c"
  #include "ec/ec_key.c"
  #include "ec/ec_montgomery.c"
  #include "ec/felem.c"
  #include "ec/oct.c"
  #include "ec/p224-64.c"
  #include "ec/p256.c"
  #include "ec/p256-x86_64.c"
  #include "ec/scalar.c"
  #include "ec/simple.c"
  #include "ec/simple_mul.c"
  #include "ec/util.c"
  #include "ec/wnaf.c"
  #include "hmac/hmac.c"
  #include "md4/md4.c"
  #include "md5/md5.c"
  #include "modes/cbc.c"
  #include "modes/cfb.c"
  #include "modes/ctr.c"
  #include "modes/gcm.c"
  #include "modes/gcm_nohw.c"
  #include "modes/ofb.c"
  #include "modes/polyval.c"
  #include "rand/ctrdrbg.c"
  #include "rand/fork_detect.c"
  #include "rand/rand.c"
  #include "rand/urandom.c"
  #include "rsa/blinding.c"
  #include "rsa/padding.c"
  #include "rsa/rsa.c"
  #include "rsa/rsa_impl.c"
  #include "self_check/fips.c"
  #include "self_check/self_check.c"
  #include "sha/sha1-altivec.c"
  #include "sha/sha1.c"
  #include "sha/sha256.c"
  #include "sha/sha512.c"
  #include "tls/kdf.c"
  
  
  #if defined(BORINGSSL_FIPS)
  
  #if !defined(OPENSSL_ASAN)
  
  // These symbols are filled in by delocate.go (in static builds) or a linker
  // script (in shared builds). They point to the start and end of the module, and
  // the location of the integrity hash, respectively.
  extern const uint8_t BORINGSSL_bcm_text_start[];
  extern const uint8_t BORINGSSL_bcm_text_end[];
  extern const uint8_t BORINGSSL_bcm_text_hash[];
  #if defined(BORINGSSL_SHARED_LIBRARY)
  extern const uint8_t BORINGSSL_bcm_rodata_start[];
  extern const uint8_t BORINGSSL_bcm_rodata_end[];
  #endif
  
  // assert_within is used to sanity check that certain symbols are within the
  // bounds of the integrity check. It checks that start <= symbol < end and
  // aborts otherwise.
  static void assert_within(const void *start, const void *symbol,
                            const void *end) {
    const uintptr_t start_val = (uintptr_t) start;
    const uintptr_t symbol_val = (uintptr_t) symbol;
    const uintptr_t end_val = (uintptr_t) end;
  
    if (start_val <= symbol_val && symbol_val < end_val) {
      return;
    }
  
    fprintf(
        stderr,
        "FIPS module doesn't span expected symbol. Expected %p <= %p < %p\n",
        start, symbol, end);
    BORINGSSL_FIPS_abort();
  }
  
  #if defined(OPENSSL_ANDROID) && defined(OPENSSL_AARCH64)
  static void BORINGSSL_maybe_set_module_text_permissions(int permission) {
    // Android may be compiled in execute-only-memory mode, in which case the
    // .text segment cannot be read. That conflicts with the need for a FIPS
    // module to hash its own contents, therefore |mprotect| is used to make
    // the module's .text readable for the duration of the hashing process. In
    // other build configurations this is a no-op.
    const uintptr_t page_size = getpagesize();
    const uintptr_t page_start =
        ((uintptr_t)BORINGSSL_bcm_text_start) & ~(page_size - 1);
  
    if (mprotect((void *)page_start,
                 ((uintptr_t)BORINGSSL_bcm_text_end) - page_start,
                 permission) != 0) {
      perror("BoringSSL: mprotect");
    }
  }
  #else
  static void BORINGSSL_maybe_set_module_text_permissions(int permission) {}
  #endif  // !ANDROID
  
  #endif  // !ASAN
  
  static void __attribute__((constructor))
  BORINGSSL_bcm_power_on_self_test(void) {
    CRYPTO_library_init();
  
  #if !defined(OPENSSL_ASAN)
    // Integrity tests cannot run under ASAN because it involves reading the full
    // .text section, which triggers the global-buffer overflow detection.
    const uint8_t *const start = BORINGSSL_bcm_text_start;
    const uint8_t *const end = BORINGSSL_bcm_text_end;
  
    assert_within(start, AES_encrypt, end);
    assert_within(start, RSA_sign, end);
    assert_within(start, RAND_bytes, end);
    assert_within(start, EC_GROUP_cmp, end);
    assert_within(start, SHA256_Update, end);
    assert_within(start, ECDSA_do_verify, end);
    assert_within(start, EVP_AEAD_CTX_seal, end);
  
  #if defined(BORINGSSL_SHARED_LIBRARY)
    const uint8_t *const rodata_start = BORINGSSL_bcm_rodata_start;
    const uint8_t *const rodata_end = BORINGSSL_bcm_rodata_end;
  #else
    // In the static build, read-only data is placed within the .text segment.
    const uint8_t *const rodata_start = BORINGSSL_bcm_text_start;
    const uint8_t *const rodata_end = BORINGSSL_bcm_text_end;
  #endif
  
    assert_within(rodata_start, kPrimes, rodata_end);
    assert_within(rodata_start, kP256Params, rodata_end);
    assert_within(rodata_start, kPKCS1SigPrefixes, rodata_end);
  
  #if defined(OPENSSL_AARCH64) || defined(OPENSSL_ANDROID)
    uint8_t result[SHA256_DIGEST_LENGTH];
    const EVP_MD *const kHashFunction = EVP_sha256();
    if (!boringssl_self_test_sha256() ||
        !boringssl_self_test_hmac_sha256()) {
      goto err;
    }
  #else
    uint8_t result[SHA512_DIGEST_LENGTH];
    const EVP_MD *const kHashFunction = EVP_sha512();
    if (!boringssl_self_test_sha512() ||
        !boringssl_self_test_hmac_sha256()) {
      goto err;
    }
  #endif
  
    static const uint8_t kHMACKey[64] = {0};
    unsigned result_len;
    HMAC_CTX hmac_ctx;
    HMAC_CTX_init(&hmac_ctx);
    if (!HMAC_Init_ex(&hmac_ctx, kHMACKey, sizeof(kHMACKey), kHashFunction,
                      NULL /* no ENGINE */)) {
      fprintf(stderr, "HMAC_Init_ex failed.\n");
      goto err;
    }
  
    BORINGSSL_maybe_set_module_text_permissions(PROT_READ | PROT_EXEC);
  #if defined(BORINGSSL_SHARED_LIBRARY)
    uint64_t length = end - start;
    HMAC_Update(&hmac_ctx, (const uint8_t *) &length, sizeof(length));
    HMAC_Update(&hmac_ctx, start, length);
  
    length = rodata_end - rodata_start;
    HMAC_Update(&hmac_ctx, (const uint8_t *) &length, sizeof(length));
    HMAC_Update(&hmac_ctx, rodata_start, length);
  #else
    HMAC_Update(&hmac_ctx, start, end - start);
  #endif
    BORINGSSL_maybe_set_module_text_permissions(PROT_EXEC);
  
    if (!HMAC_Final(&hmac_ctx, result, &result_len) ||
        result_len != sizeof(result)) {
      fprintf(stderr, "HMAC failed.\n");
      goto err;
    }
    HMAC_CTX_cleanse(&hmac_ctx); // FIPS 140-3, AS05.10.
  
    const uint8_t *expected = BORINGSSL_bcm_text_hash;
  
    if (!check_test(expected, result, sizeof(result), "FIPS integrity test")) {
      goto err;
    }
  
    OPENSSL_cleanse(result, sizeof(result)); // FIPS 140-3, AS05.10.
  #endif  // OPENSSL_ASAN
  
    if (!BORINGSSL_self_test()) {
      goto err;
    }
  
    return;
  
  err:
    BORINGSSL_FIPS_abort();
  }
  
  void BORINGSSL_FIPS_abort(void) {
    for (;;) {
      abort();
      exit(1);
    }
  }
  
  #endif  // BORINGSSL_FIPS
  