mirror of
https://github.com/openssl/openssl.git
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f75abcc0f0
Fixes #10438 issue found by clusterfuzz/ossfuzz The dest was getting a copy of the src structure which contained a pointer that should point to an offset inside itself - because of the copy it was pointing to the original structure. The setup for a ctx is mainly done by the initkey method in the PROV_CIPHER_HW structure. Because of this it makes sense that the structure should also contain a copyctx method that is use to resolve any pointers that need to be setup. A dup_ctx has been added to the cipher_enc tests in evp_test. It does a dup after setup and then frees the original ctx. This detects any floating pointers in the duplicated context that were pointing back to the freed ctx. Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/10443)
284 lines
16 KiB
C
284 lines
16 KiB
C
/*
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* Copyright 2019 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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#include <openssl/params.h>
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#include <openssl/core_numbers.h>
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#include <openssl/core_names.h>
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#include <openssl/evp.h>
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#include "internal/cryptlib.h"
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#include "crypto/modes.h"
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#include "crypto/ciphermode_platform.h"
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#define MAXCHUNK ((size_t)1 << (sizeof(long) * 8 - 2))
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#define MAXBITCHUNK ((size_t)1 << (sizeof(size_t) * 8 - 4))
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#define GENERIC_BLOCK_SIZE 16
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#define IV_STATE_UNINITIALISED 0 /* initial state is not initialized */
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#define IV_STATE_BUFFERED 1 /* iv has been copied to the iv buffer */
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#define IV_STATE_COPIED 2 /* iv has been copied from the iv buffer */
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#define IV_STATE_FINISHED 3 /* the iv has been used - so don't reuse it */
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#define PROV_CIPHER_FUNC(type, name, args) typedef type (* OSSL_##name##_fn)args
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typedef struct prov_cipher_hw_st PROV_CIPHER_HW;
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typedef struct prov_cipher_ctx_st PROV_CIPHER_CTX;
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typedef int (PROV_CIPHER_HW_FN)(PROV_CIPHER_CTX *dat, unsigned char *out,
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const unsigned char *in, size_t len);
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struct prov_cipher_ctx_st {
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block128_f block;
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union {
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cbc128_f cbc;
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ctr128_f ctr;
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} stream;
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unsigned int mode;
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size_t keylen; /* key size (in bytes) */
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size_t ivlen;
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size_t blocksize;
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size_t bufsz; /* Number of bytes in buf */
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unsigned int pad : 1; /* Whether padding should be used or not */
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unsigned int enc : 1; /* Set to 1 for encrypt, or 0 otherwise */
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unsigned int iv_set : 1; /* Set when the iv is copied to the iv/oiv buffers */
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/*
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* num contains the number of bytes of |iv| which are valid for modes that
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* manage partial blocks themselves.
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*/
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unsigned int num;
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uint64_t flags;
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/* The original value of the iv */
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unsigned char oiv[GENERIC_BLOCK_SIZE];
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/* Buffer of partial blocks processed via update calls */
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unsigned char buf[GENERIC_BLOCK_SIZE];
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unsigned char iv[GENERIC_BLOCK_SIZE];
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const PROV_CIPHER_HW *hw; /* hardware specific functions */
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const void *ks; /* Pointer to algorithm specific key data */
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OPENSSL_CTX *libctx;
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};
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struct prov_cipher_hw_st {
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int (*init)(PROV_CIPHER_CTX *dat, const uint8_t *key, size_t keylen);
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PROV_CIPHER_HW_FN *cipher;
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void (*copyctx)(PROV_CIPHER_CTX *dst, const PROV_CIPHER_CTX *src);
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};
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OSSL_OP_cipher_encrypt_init_fn cipher_generic_einit;
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OSSL_OP_cipher_decrypt_init_fn cipher_generic_dinit;
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OSSL_OP_cipher_update_fn cipher_generic_block_update;
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OSSL_OP_cipher_final_fn cipher_generic_block_final;
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OSSL_OP_cipher_update_fn cipher_generic_stream_update;
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OSSL_OP_cipher_final_fn cipher_generic_stream_final;
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OSSL_OP_cipher_cipher_fn cipher_generic_cipher;
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OSSL_OP_cipher_get_ctx_params_fn cipher_generic_get_ctx_params;
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OSSL_OP_cipher_set_ctx_params_fn cipher_generic_set_ctx_params;
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OSSL_OP_cipher_gettable_params_fn cipher_generic_gettable_params;
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OSSL_OP_cipher_gettable_ctx_params_fn cipher_generic_gettable_ctx_params;
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OSSL_OP_cipher_settable_ctx_params_fn cipher_generic_settable_ctx_params;
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OSSL_OP_cipher_gettable_ctx_params_fn cipher_aead_gettable_ctx_params;
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OSSL_OP_cipher_settable_ctx_params_fn cipher_aead_settable_ctx_params;
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int cipher_generic_get_params(OSSL_PARAM params[], unsigned int md,
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unsigned long flags,
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size_t kbits, size_t blkbits, size_t ivbits);
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void cipher_generic_initkey(void *vctx, size_t kbits, size_t blkbits,
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size_t ivbits, unsigned int mode, uint64_t flags,
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const PROV_CIPHER_HW *hw, void *provctx);
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#define IMPLEMENT_generic_cipher_func(alg, UCALG, lcmode, UCMODE, flags, kbits,\
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blkbits, ivbits, typ) \
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const OSSL_DISPATCH alg##kbits##lcmode##_functions[] = { \
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{ OSSL_FUNC_CIPHER_NEWCTX, \
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(void (*)(void)) alg##_##kbits##_##lcmode##_newctx }, \
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{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void)) alg##_freectx }, \
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{ OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void)) alg##_dupctx }, \
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{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))cipher_generic_einit }, \
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{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))cipher_generic_dinit }, \
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{ OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))cipher_generic_##typ##_update },\
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{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))cipher_generic_##typ##_final }, \
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{ OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))cipher_generic_cipher }, \
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{ OSSL_FUNC_CIPHER_GET_PARAMS, \
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(void (*)(void)) alg##_##kbits##_##lcmode##_get_params }, \
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{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
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(void (*)(void))cipher_generic_get_ctx_params }, \
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{ OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
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(void (*)(void))cipher_generic_set_ctx_params }, \
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{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
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(void (*)(void))cipher_generic_gettable_params }, \
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{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
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(void (*)(void))cipher_generic_gettable_ctx_params }, \
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{ OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
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(void (*)(void))cipher_generic_settable_ctx_params }, \
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{ 0, NULL } \
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};
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#define IMPLEMENT_generic_cipher(alg, UCALG, lcmode, UCMODE, flags, kbits, \
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blkbits, ivbits, typ) \
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static OSSL_OP_cipher_get_params_fn alg##_##kbits##_##lcmode##_get_params; \
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static int alg##_##kbits##_##lcmode##_get_params(OSSL_PARAM params[]) \
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{ \
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return cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE, flags, \
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kbits, blkbits, ivbits); \
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} \
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static OSSL_OP_cipher_newctx_fn alg##_##kbits##_##lcmode##_newctx; \
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static void * alg##_##kbits##_##lcmode##_newctx(void *provctx) \
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{ \
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PROV_##UCALG##_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx)); \
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if (ctx != NULL) { \
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cipher_generic_initkey(ctx, kbits, blkbits, ivbits, \
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EVP_CIPH_##UCMODE##_MODE, flags, \
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PROV_CIPHER_HW_##alg##_##lcmode(kbits), NULL); \
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} \
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return ctx; \
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} \
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IMPLEMENT_generic_cipher_func(alg, UCALG, lcmode, UCMODE, flags, kbits, \
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blkbits, ivbits, typ)
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PROV_CIPHER_HW_FN cipher_hw_generic_cbc;
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PROV_CIPHER_HW_FN cipher_hw_generic_ecb;
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PROV_CIPHER_HW_FN cipher_hw_generic_ofb128;
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PROV_CIPHER_HW_FN cipher_hw_generic_cfb128;
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PROV_CIPHER_HW_FN cipher_hw_generic_cfb8;
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PROV_CIPHER_HW_FN cipher_hw_generic_cfb1;
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PROV_CIPHER_HW_FN cipher_hw_generic_ctr;
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PROV_CIPHER_HW_FN cipher_hw_chunked_cbc;
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PROV_CIPHER_HW_FN cipher_hw_chunked_cfb8;
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PROV_CIPHER_HW_FN cipher_hw_chunked_cfb128;
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PROV_CIPHER_HW_FN cipher_hw_chunked_ofb128;
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#define cipher_hw_chunked_ecb cipher_hw_generic_ecb
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#define cipher_hw_chunked_ctr cipher_hw_generic_ctr
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#define cipher_hw_chunked_cfb1 cipher_hw_generic_cfb1
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#define IMPLEMENT_CIPHER_HW_OFB(MODE, NAME, CTX_NAME, KEY_NAME, FUNC_PREFIX) \
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static int cipher_hw_##NAME##_##MODE##_cipher(PROV_CIPHER_CTX *ctx, \
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unsigned char *out, \
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const unsigned char *in, size_t len) \
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{ \
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int num = ctx->num; \
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KEY_NAME *key = &(((CTX_NAME *)ctx)->ks.ks); \
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\
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while (len >= MAXCHUNK) { \
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FUNC_PREFIX##_encrypt(in, out, MAXCHUNK, key, ctx->iv, &num); \
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len -= MAXCHUNK; \
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in += MAXCHUNK; \
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out += MAXCHUNK; \
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} \
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if (len > 0) { \
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FUNC_PREFIX##_encrypt(in, out, (long)len, key, ctx->iv, &num); \
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} \
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ctx->num = num; \
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return 1; \
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}
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#define IMPLEMENT_CIPHER_HW_ECB(MODE, NAME, CTX_NAME, KEY_NAME, FUNC_PREFIX) \
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static int cipher_hw_##NAME##_##MODE##_cipher(PROV_CIPHER_CTX *ctx, \
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unsigned char *out, \
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const unsigned char *in, size_t len) \
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{ \
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size_t i, bl = ctx->blocksize; \
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KEY_NAME *key = &(((CTX_NAME *)ctx)->ks.ks); \
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\
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if (len < bl) \
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return 1; \
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for (i = 0, len -= bl; i <= len; i += bl) \
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FUNC_PREFIX##_encrypt(in + i, out + i, key, ctx->enc); \
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return 1; \
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}
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#define IMPLEMENT_CIPHER_HW_CBC(MODE, NAME, CTX_NAME, KEY_NAME, FUNC_PREFIX) \
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static int cipher_hw_##NAME##_##MODE##_cipher(PROV_CIPHER_CTX *ctx, \
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unsigned char *out, \
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const unsigned char *in, size_t len) \
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{ \
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KEY_NAME *key = &(((CTX_NAME *)ctx)->ks.ks); \
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\
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while (len >= MAXCHUNK) { \
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FUNC_PREFIX##_encrypt(in, out, MAXCHUNK, key, ctx->iv, ctx->enc); \
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len -= MAXCHUNK; \
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in += MAXCHUNK; \
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out += MAXCHUNK; \
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} \
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if (len > 0) \
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FUNC_PREFIX##_encrypt(in, out, (long)len, key, ctx->iv, ctx->enc); \
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return 1; \
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}
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#define IMPLEMENT_CIPHER_HW_CFB(MODE, NAME, CTX_NAME, KEY_NAME, FUNC_PREFIX) \
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static int cipher_hw_##NAME##_##MODE##_cipher(PROV_CIPHER_CTX *ctx, \
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unsigned char *out, \
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const unsigned char *in, size_t len) \
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{ \
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size_t chunk = MAXCHUNK; \
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KEY_NAME *key = &(((CTX_NAME *)ctx)->ks.ks); \
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int num = ctx->num; \
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\
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if (len < chunk) \
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chunk = len; \
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while (len > 0 && len >= chunk) { \
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FUNC_PREFIX##_encrypt(in, out, (long)chunk, key, ctx->iv, &num, \
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ctx->enc); \
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len -= chunk; \
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in += chunk; \
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out += chunk; \
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if (len < chunk) \
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chunk = len; \
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} \
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ctx->num = num; \
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return 1; \
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}
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#define IMPLEMENT_CIPHER_HW_COPYCTX(name, CTX_TYPE) \
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static void name(PROV_CIPHER_CTX *dst, const PROV_CIPHER_CTX *src) \
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{ \
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CTX_TYPE *sctx = (CTX_TYPE *)src; \
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CTX_TYPE *dctx = (CTX_TYPE *)dst; \
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\
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*dctx = *sctx; \
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dst->ks = &dctx->ks.ks; \
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}
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#define CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_START(name) \
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static const OSSL_PARAM name##_known_gettable_ctx_params[] = { \
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OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL), \
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OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL), \
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OSSL_PARAM_uint(OSSL_CIPHER_PARAM_PADDING, NULL), \
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OSSL_PARAM_uint(OSSL_CIPHER_PARAM_NUM, NULL), \
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OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_IV, NULL, 0),
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#define CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_END(name) \
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OSSL_PARAM_END \
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}; \
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const OSSL_PARAM * name##_gettable_ctx_params(void) \
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{ \
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return name##_known_gettable_ctx_params; \
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}
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#define CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_START(name) \
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static const OSSL_PARAM name##_known_settable_ctx_params[] = { \
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OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL), \
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OSSL_PARAM_uint(OSSL_CIPHER_PARAM_PADDING, NULL), \
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OSSL_PARAM_uint(OSSL_CIPHER_PARAM_NUM, NULL),
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#define CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_END(name) \
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OSSL_PARAM_END \
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}; \
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const OSSL_PARAM * name##_settable_ctx_params(void) \
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{ \
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return name##_known_settable_ctx_params; \
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}
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int cipher_generic_initiv(PROV_CIPHER_CTX *ctx, const unsigned char *iv,
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size_t ivlen);
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size_t fillblock(unsigned char *buf, size_t *buflen, size_t blocksize,
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const unsigned char **in, size_t *inlen);
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int trailingdata(unsigned char *buf, size_t *buflen, size_t blocksize,
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const unsigned char **in, size_t *inlen);
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