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https://github.com/freebsd/freebsd-src
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b077aed33b
Migrate to OpenSSL 3.0 in advance of FreeBSD 14.0. OpenSSL 1.1.1 (the version we were previously using) will be EOL as of 2023-09-11. Most of the base system has already been updated for a seamless switch to OpenSSL 3.0. For many components we've added `-DOPENSSL_API_COMPAT=0x10100000L` to CFLAGS to specify the API version, which avoids deprecation warnings from OpenSSL 3.0. Changes have also been made to avoid OpenSSL APIs that were already deprecated in OpenSSL 1.1.1. The process of updating to contemporary APIs can continue after this merge. Additional changes are still required for libarchive and Kerberos- related libraries or tools; workarounds will immediately follow this commit. Fixes are in progress in the upstream projects and will be incorporated when those are next updated. There are some performance regressions in benchmarks (certain tests in `openssl speed`) and in some OpenSSL consumers in ports (e.g. haproxy). Investigation will continue for these. Netflix's testing showed no functional regression and a rather small, albeit statistically significant, increase in CPU consumption with OpenSSL 3.0. Thanks to ngie@ and des@ for updating base system components, to antoine@ and bofh@ for ports exp-runs and port fixes/workarounds, and to Netflix and everyone who tested prior to commit or contributed to this update in other ways. PR: 271615 PR: 271656 [exp-run] Relnotes: Yes Sponsored by: The FreeBSD Foundation
514 lines
19 KiB
C
514 lines
19 KiB
C
/*
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* Copyright 2012-2021 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* This file has no dependencies on the rest of libssl because it is shared
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* with the providers. It contains functions for low level MAC calculations.
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* Responsibility for this lies with the HMAC implementation in the
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* providers. However there are legacy code paths in libssl which also need to
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* do this. In time those legacy code paths can be removed and this file can be
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* moved out of libssl.
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*/
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/*
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* MD5 and SHA-1 low level APIs are deprecated for public use, but still ok for
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* internal use.
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*/
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#include "internal/deprecated.h"
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#include "internal/constant_time.h"
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#include "internal/cryptlib.h"
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#include <openssl/evp.h>
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#ifndef FIPS_MODULE
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# include <openssl/md5.h>
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#endif
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#include <openssl/sha.h>
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char ssl3_cbc_record_digest_supported(const EVP_MD_CTX *ctx);
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int ssl3_cbc_digest_record(const EVP_MD *md,
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unsigned char *md_out,
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size_t *md_out_size,
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const unsigned char *header,
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const unsigned char *data,
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size_t data_size,
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size_t data_plus_mac_plus_padding_size,
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const unsigned char *mac_secret,
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size_t mac_secret_length, char is_sslv3);
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# define l2n(l,c) (*((c)++)=(unsigned char)(((l)>>24)&0xff), \
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*((c)++)=(unsigned char)(((l)>>16)&0xff), \
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*((c)++)=(unsigned char)(((l)>> 8)&0xff), \
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*((c)++)=(unsigned char)(((l) )&0xff))
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# define l2n6(l,c) (*((c)++)=(unsigned char)(((l)>>40)&0xff), \
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*((c)++)=(unsigned char)(((l)>>32)&0xff), \
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*((c)++)=(unsigned char)(((l)>>24)&0xff), \
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*((c)++)=(unsigned char)(((l)>>16)&0xff), \
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*((c)++)=(unsigned char)(((l)>> 8)&0xff), \
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*((c)++)=(unsigned char)(((l) )&0xff))
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# define l2n8(l,c) (*((c)++)=(unsigned char)(((l)>>56)&0xff), \
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*((c)++)=(unsigned char)(((l)>>48)&0xff), \
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*((c)++)=(unsigned char)(((l)>>40)&0xff), \
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*((c)++)=(unsigned char)(((l)>>32)&0xff), \
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*((c)++)=(unsigned char)(((l)>>24)&0xff), \
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*((c)++)=(unsigned char)(((l)>>16)&0xff), \
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*((c)++)=(unsigned char)(((l)>> 8)&0xff), \
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*((c)++)=(unsigned char)(((l) )&0xff))
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/*
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* MAX_HASH_BIT_COUNT_BYTES is the maximum number of bytes in the hash's
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* length field. (SHA-384/512 have 128-bit length.)
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*/
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#define MAX_HASH_BIT_COUNT_BYTES 16
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/*
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* MAX_HASH_BLOCK_SIZE is the maximum hash block size that we'll support.
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* Currently SHA-384/512 has a 128-byte block size and that's the largest
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* supported by TLS.)
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*/
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#define MAX_HASH_BLOCK_SIZE 128
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#ifndef FIPS_MODULE
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/*
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* u32toLE serializes an unsigned, 32-bit number (n) as four bytes at (p) in
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* little-endian order. The value of p is advanced by four.
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*/
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# define u32toLE(n, p) \
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(*((p)++)=(unsigned char)(n), \
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*((p)++)=(unsigned char)(n>>8), \
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*((p)++)=(unsigned char)(n>>16), \
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*((p)++)=(unsigned char)(n>>24))
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/*
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* These functions serialize the state of a hash and thus perform the
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* standard "final" operation without adding the padding and length that such
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* a function typically does.
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*/
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static void tls1_md5_final_raw(void *ctx, unsigned char *md_out)
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{
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MD5_CTX *md5 = ctx;
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u32toLE(md5->A, md_out);
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u32toLE(md5->B, md_out);
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u32toLE(md5->C, md_out);
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u32toLE(md5->D, md_out);
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}
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#endif /* FIPS_MODULE */
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static void tls1_sha1_final_raw(void *ctx, unsigned char *md_out)
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{
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SHA_CTX *sha1 = ctx;
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l2n(sha1->h0, md_out);
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l2n(sha1->h1, md_out);
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l2n(sha1->h2, md_out);
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l2n(sha1->h3, md_out);
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l2n(sha1->h4, md_out);
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}
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static void tls1_sha256_final_raw(void *ctx, unsigned char *md_out)
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{
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SHA256_CTX *sha256 = ctx;
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unsigned i;
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for (i = 0; i < 8; i++) {
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l2n(sha256->h[i], md_out);
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}
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}
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static void tls1_sha512_final_raw(void *ctx, unsigned char *md_out)
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{
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SHA512_CTX *sha512 = ctx;
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unsigned i;
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for (i = 0; i < 8; i++) {
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l2n8(sha512->h[i], md_out);
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}
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}
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#undef LARGEST_DIGEST_CTX
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#define LARGEST_DIGEST_CTX SHA512_CTX
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/*-
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* ssl3_cbc_digest_record computes the MAC of a decrypted, padded SSLv3/TLS
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* record.
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*
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* ctx: the EVP_MD_CTX from which we take the hash function.
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* ssl3_cbc_record_digest_supported must return true for this EVP_MD_CTX.
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* md_out: the digest output. At most EVP_MAX_MD_SIZE bytes will be written.
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* md_out_size: if non-NULL, the number of output bytes is written here.
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* header: the 13-byte, TLS record header.
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* data: the record data itself, less any preceding explicit IV.
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* data_size: the secret, reported length of the data once the MAC and padding
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* has been removed.
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* data_plus_mac_plus_padding_size: the public length of the whole
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* record, including MAC and padding.
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* is_sslv3: non-zero if we are to use SSLv3. Otherwise, TLS.
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*
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* On entry: we know that data is data_plus_mac_plus_padding_size in length
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* Returns 1 on success or 0 on error
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*/
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int ssl3_cbc_digest_record(const EVP_MD *md,
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unsigned char *md_out,
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size_t *md_out_size,
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const unsigned char *header,
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const unsigned char *data,
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size_t data_size,
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size_t data_plus_mac_plus_padding_size,
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const unsigned char *mac_secret,
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size_t mac_secret_length, char is_sslv3)
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{
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union {
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OSSL_UNION_ALIGN;
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unsigned char c[sizeof(LARGEST_DIGEST_CTX)];
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} md_state;
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void (*md_final_raw) (void *ctx, unsigned char *md_out);
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void (*md_transform) (void *ctx, const unsigned char *block);
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size_t md_size, md_block_size = 64;
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size_t sslv3_pad_length = 40, header_length, variance_blocks,
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len, max_mac_bytes, num_blocks,
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num_starting_blocks, k, mac_end_offset, c, index_a, index_b;
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size_t bits; /* at most 18 bits */
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unsigned char length_bytes[MAX_HASH_BIT_COUNT_BYTES];
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/* hmac_pad is the masked HMAC key. */
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unsigned char hmac_pad[MAX_HASH_BLOCK_SIZE];
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unsigned char first_block[MAX_HASH_BLOCK_SIZE];
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unsigned char mac_out[EVP_MAX_MD_SIZE];
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size_t i, j;
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unsigned md_out_size_u;
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EVP_MD_CTX *md_ctx = NULL;
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/*
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* mdLengthSize is the number of bytes in the length field that
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* terminates * the hash.
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*/
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size_t md_length_size = 8;
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char length_is_big_endian = 1;
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int ret = 0;
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/*
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* This is a, hopefully redundant, check that allows us to forget about
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* many possible overflows later in this function.
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*/
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if (!ossl_assert(data_plus_mac_plus_padding_size < 1024 * 1024))
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return 0;
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if (EVP_MD_is_a(md, "MD5")) {
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#ifdef FIPS_MODULE
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return 0;
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#else
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if (MD5_Init((MD5_CTX *)md_state.c) <= 0)
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return 0;
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md_final_raw = tls1_md5_final_raw;
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md_transform =
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(void (*)(void *ctx, const unsigned char *block))MD5_Transform;
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md_size = 16;
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sslv3_pad_length = 48;
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length_is_big_endian = 0;
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#endif
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} else if (EVP_MD_is_a(md, "SHA1")) {
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if (SHA1_Init((SHA_CTX *)md_state.c) <= 0)
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return 0;
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md_final_raw = tls1_sha1_final_raw;
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md_transform =
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(void (*)(void *ctx, const unsigned char *block))SHA1_Transform;
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md_size = 20;
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} else if (EVP_MD_is_a(md, "SHA2-224")) {
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if (SHA224_Init((SHA256_CTX *)md_state.c) <= 0)
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return 0;
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md_final_raw = tls1_sha256_final_raw;
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md_transform =
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(void (*)(void *ctx, const unsigned char *block))SHA256_Transform;
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md_size = 224 / 8;
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} else if (EVP_MD_is_a(md, "SHA2-256")) {
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if (SHA256_Init((SHA256_CTX *)md_state.c) <= 0)
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return 0;
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md_final_raw = tls1_sha256_final_raw;
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md_transform =
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(void (*)(void *ctx, const unsigned char *block))SHA256_Transform;
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md_size = 32;
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} else if (EVP_MD_is_a(md, "SHA2-384")) {
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if (SHA384_Init((SHA512_CTX *)md_state.c) <= 0)
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return 0;
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md_final_raw = tls1_sha512_final_raw;
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md_transform =
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(void (*)(void *ctx, const unsigned char *block))SHA512_Transform;
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md_size = 384 / 8;
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md_block_size = 128;
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md_length_size = 16;
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} else if (EVP_MD_is_a(md, "SHA2-512")) {
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if (SHA512_Init((SHA512_CTX *)md_state.c) <= 0)
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return 0;
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md_final_raw = tls1_sha512_final_raw;
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md_transform =
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(void (*)(void *ctx, const unsigned char *block))SHA512_Transform;
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md_size = 64;
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md_block_size = 128;
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md_length_size = 16;
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} else {
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/*
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* ssl3_cbc_record_digest_supported should have been called first to
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* check that the hash function is supported.
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*/
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if (md_out_size != NULL)
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*md_out_size = 0;
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return ossl_assert(0);
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}
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if (!ossl_assert(md_length_size <= MAX_HASH_BIT_COUNT_BYTES)
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|| !ossl_assert(md_block_size <= MAX_HASH_BLOCK_SIZE)
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|| !ossl_assert(md_size <= EVP_MAX_MD_SIZE))
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return 0;
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header_length = 13;
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if (is_sslv3) {
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header_length = mac_secret_length + sslv3_pad_length + 8 /* sequence
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* number */ +
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1 /* record type */ +
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2 /* record length */ ;
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}
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/*
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* variance_blocks is the number of blocks of the hash that we have to
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* calculate in constant time because they could be altered by the
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* padding value. In SSLv3, the padding must be minimal so the end of
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* the plaintext varies by, at most, 15+20 = 35 bytes. (We conservatively
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* assume that the MAC size varies from 0..20 bytes.) In case the 9 bytes
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* of hash termination (0x80 + 64-bit length) don't fit in the final
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* block, we say that the final two blocks can vary based on the padding.
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* TLSv1 has MACs up to 48 bytes long (SHA-384) and the padding is not
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* required to be minimal. Therefore we say that the final |variance_blocks|
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* blocks can
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* vary based on the padding. Later in the function, if the message is
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* short and there obviously cannot be this many blocks then
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* variance_blocks can be reduced.
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*/
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variance_blocks = is_sslv3 ? 2 : ( ((255 + 1 + md_size + md_block_size - 1) / md_block_size) + 1);
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/*
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* From now on we're dealing with the MAC, which conceptually has 13
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* bytes of `header' before the start of the data (TLS) or 71/75 bytes
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* (SSLv3)
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*/
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len = data_plus_mac_plus_padding_size + header_length;
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/*
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* max_mac_bytes contains the maximum bytes of bytes in the MAC,
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* including * |header|, assuming that there's no padding.
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*/
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max_mac_bytes = len - md_size - 1;
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/* num_blocks is the maximum number of hash blocks. */
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num_blocks =
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(max_mac_bytes + 1 + md_length_size + md_block_size -
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1) / md_block_size;
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/*
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* In order to calculate the MAC in constant time we have to handle the
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* final blocks specially because the padding value could cause the end
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* to appear somewhere in the final |variance_blocks| blocks and we can't
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* leak where. However, |num_starting_blocks| worth of data can be hashed
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* right away because no padding value can affect whether they are
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* plaintext.
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*/
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num_starting_blocks = 0;
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/*
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* k is the starting byte offset into the conceptual header||data where
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* we start processing.
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*/
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k = 0;
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/*
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* mac_end_offset is the index just past the end of the data to be MACed.
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*/
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mac_end_offset = data_size + header_length;
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/*
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* c is the index of the 0x80 byte in the final hash block that contains
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* application data.
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*/
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c = mac_end_offset % md_block_size;
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/*
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* index_a is the hash block number that contains the 0x80 terminating
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* value.
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*/
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index_a = mac_end_offset / md_block_size;
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/*
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* index_b is the hash block number that contains the 64-bit hash length,
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* in bits.
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*/
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index_b = (mac_end_offset + md_length_size) / md_block_size;
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/*
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* bits is the hash-length in bits. It includes the additional hash block
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* for the masked HMAC key, or whole of |header| in the case of SSLv3.
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*/
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/*
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* For SSLv3, if we're going to have any starting blocks then we need at
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* least two because the header is larger than a single block.
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*/
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if (num_blocks > variance_blocks + (is_sslv3 ? 1 : 0)) {
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num_starting_blocks = num_blocks - variance_blocks;
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k = md_block_size * num_starting_blocks;
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}
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bits = 8 * mac_end_offset;
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if (!is_sslv3) {
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/*
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* Compute the initial HMAC block. For SSLv3, the padding and secret
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* bytes are included in |header| because they take more than a
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* single block.
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*/
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bits += 8 * md_block_size;
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memset(hmac_pad, 0, md_block_size);
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if (!ossl_assert(mac_secret_length <= sizeof(hmac_pad)))
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return 0;
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memcpy(hmac_pad, mac_secret, mac_secret_length);
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for (i = 0; i < md_block_size; i++)
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hmac_pad[i] ^= 0x36;
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md_transform(md_state.c, hmac_pad);
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}
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if (length_is_big_endian) {
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memset(length_bytes, 0, md_length_size - 4);
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length_bytes[md_length_size - 4] = (unsigned char)(bits >> 24);
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length_bytes[md_length_size - 3] = (unsigned char)(bits >> 16);
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length_bytes[md_length_size - 2] = (unsigned char)(bits >> 8);
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length_bytes[md_length_size - 1] = (unsigned char)bits;
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} else {
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memset(length_bytes, 0, md_length_size);
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length_bytes[md_length_size - 5] = (unsigned char)(bits >> 24);
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length_bytes[md_length_size - 6] = (unsigned char)(bits >> 16);
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length_bytes[md_length_size - 7] = (unsigned char)(bits >> 8);
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length_bytes[md_length_size - 8] = (unsigned char)bits;
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}
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if (k > 0) {
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if (is_sslv3) {
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size_t overhang;
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/*
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* The SSLv3 header is larger than a single block. overhang is
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* the number of bytes beyond a single block that the header
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* consumes: either 7 bytes (SHA1) or 11 bytes (MD5). There are no
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* ciphersuites in SSLv3 that are not SHA1 or MD5 based and
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* therefore we can be confident that the header_length will be
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* greater than |md_block_size|. However we add a sanity check just
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* in case
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*/
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if (header_length <= md_block_size) {
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/* Should never happen */
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return 0;
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}
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overhang = header_length - md_block_size;
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md_transform(md_state.c, header);
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memcpy(first_block, header + md_block_size, overhang);
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memcpy(first_block + overhang, data, md_block_size - overhang);
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md_transform(md_state.c, first_block);
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for (i = 1; i < k / md_block_size - 1; i++)
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md_transform(md_state.c, data + md_block_size * i - overhang);
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} else {
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/* k is a multiple of md_block_size. */
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memcpy(first_block, header, 13);
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memcpy(first_block + 13, data, md_block_size - 13);
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md_transform(md_state.c, first_block);
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for (i = 1; i < k / md_block_size; i++)
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md_transform(md_state.c, data + md_block_size * i - 13);
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}
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}
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memset(mac_out, 0, sizeof(mac_out));
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/*
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* We now process the final hash blocks. For each block, we construct it
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* in constant time. If the |i==index_a| then we'll include the 0x80
|
|
* bytes and zero pad etc. For each block we selectively copy it, in
|
|
* constant time, to |mac_out|.
|
|
*/
|
|
for (i = num_starting_blocks; i <= num_starting_blocks + variance_blocks;
|
|
i++) {
|
|
unsigned char block[MAX_HASH_BLOCK_SIZE];
|
|
unsigned char is_block_a = constant_time_eq_8_s(i, index_a);
|
|
unsigned char is_block_b = constant_time_eq_8_s(i, index_b);
|
|
for (j = 0; j < md_block_size; j++) {
|
|
unsigned char b = 0, is_past_c, is_past_cp1;
|
|
if (k < header_length)
|
|
b = header[k];
|
|
else if (k < data_plus_mac_plus_padding_size + header_length)
|
|
b = data[k - header_length];
|
|
k++;
|
|
|
|
is_past_c = is_block_a & constant_time_ge_8_s(j, c);
|
|
is_past_cp1 = is_block_a & constant_time_ge_8_s(j, c + 1);
|
|
/*
|
|
* If this is the block containing the end of the application
|
|
* data, and we are at the offset for the 0x80 value, then
|
|
* overwrite b with 0x80.
|
|
*/
|
|
b = constant_time_select_8(is_past_c, 0x80, b);
|
|
/*
|
|
* If this block contains the end of the application data
|
|
* and we're past the 0x80 value then just write zero.
|
|
*/
|
|
b = b & ~is_past_cp1;
|
|
/*
|
|
* If this is index_b (the final block), but not index_a (the end
|
|
* of the data), then the 64-bit length didn't fit into index_a
|
|
* and we're having to add an extra block of zeros.
|
|
*/
|
|
b &= ~is_block_b | is_block_a;
|
|
|
|
/*
|
|
* The final bytes of one of the blocks contains the length.
|
|
*/
|
|
if (j >= md_block_size - md_length_size) {
|
|
/* If this is index_b, write a length byte. */
|
|
b = constant_time_select_8(is_block_b,
|
|
length_bytes[j -
|
|
(md_block_size -
|
|
md_length_size)], b);
|
|
}
|
|
block[j] = b;
|
|
}
|
|
|
|
md_transform(md_state.c, block);
|
|
md_final_raw(md_state.c, block);
|
|
/* If this is index_b, copy the hash value to |mac_out|. */
|
|
for (j = 0; j < md_size; j++)
|
|
mac_out[j] |= block[j] & is_block_b;
|
|
}
|
|
|
|
md_ctx = EVP_MD_CTX_new();
|
|
if (md_ctx == NULL)
|
|
goto err;
|
|
|
|
if (EVP_DigestInit_ex(md_ctx, md, NULL /* engine */ ) <= 0)
|
|
goto err;
|
|
if (is_sslv3) {
|
|
/* We repurpose |hmac_pad| to contain the SSLv3 pad2 block. */
|
|
memset(hmac_pad, 0x5c, sslv3_pad_length);
|
|
|
|
if (EVP_DigestUpdate(md_ctx, mac_secret, mac_secret_length) <= 0
|
|
|| EVP_DigestUpdate(md_ctx, hmac_pad, sslv3_pad_length) <= 0
|
|
|| EVP_DigestUpdate(md_ctx, mac_out, md_size) <= 0)
|
|
goto err;
|
|
} else {
|
|
/* Complete the HMAC in the standard manner. */
|
|
for (i = 0; i < md_block_size; i++)
|
|
hmac_pad[i] ^= 0x6a;
|
|
|
|
if (EVP_DigestUpdate(md_ctx, hmac_pad, md_block_size) <= 0
|
|
|| EVP_DigestUpdate(md_ctx, mac_out, md_size) <= 0)
|
|
goto err;
|
|
}
|
|
ret = EVP_DigestFinal(md_ctx, md_out, &md_out_size_u);
|
|
if (ret && md_out_size)
|
|
*md_out_size = md_out_size_u;
|
|
|
|
ret = 1;
|
|
err:
|
|
EVP_MD_CTX_free(md_ctx);
|
|
return ret;
|
|
}
|