diff options
author | Robbie Harwood <rharwood@redhat.com> | 2019-09-10 17:46:44 -0400 |
---|---|---|
committer | Richard Levitte <levitte@openssl.org> | 2019-09-27 23:17:26 +0200 |
commit | a39bc4404baa4e065d01efe829a1f26eba737049 (patch) | |
tree | e9e744551b5ab87c382f569ff115e8b354dcfb1c /providers/common | |
parent | 8f3b8fd6f45fc5f2ab924011908a1e66c2dba462 (diff) |
[KDF] Add KBKDF implementation for counter-mode HMAC
Implement SP800-108 section 5.1 with HMAC intended for use in Kerberos.
Add test vectors from RFC 8009.
Adds error codes PROV_R_INVALID_MAC and PROV_R_MISSING_MAC.
Signed-off-by: Robbie Harwood <rharwood@redhat.com>
Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9924)
Diffstat (limited to 'providers/common')
-rw-r--r-- | providers/common/include/internal/provider_algs.h | 1 | ||||
-rw-r--r-- | providers/common/include/internal/providercommonerr.h | 2 | ||||
-rw-r--r-- | providers/common/kdfs/build.info | 2 | ||||
-rw-r--r-- | providers/common/kdfs/kbkdf.c | 303 |
4 files changed, 307 insertions, 1 deletions
diff --git a/providers/common/include/internal/provider_algs.h b/providers/common/include/internal/provider_algs.h index 4bbbbf61c5..3e23788698 100644 --- a/providers/common/include/internal/provider_algs.h +++ b/providers/common/include/internal/provider_algs.h @@ -212,6 +212,7 @@ extern const OSSL_DISPATCH kdf_hkdf_functions[]; extern const OSSL_DISPATCH kdf_sshkdf_functions[]; extern const OSSL_DISPATCH kdf_sskdf_functions[]; extern const OSSL_DISPATCH kdf_x963_kdf_functions[]; +extern const OSSL_DISPATCH kdf_kbkdf_functions[]; #ifndef OPENSSL_NO_CMS extern const OSSL_DISPATCH kdf_x942_kdf_functions[]; #endif diff --git a/providers/common/include/internal/providercommonerr.h b/providers/common/include/internal/providercommonerr.h index 81e5931d84..a9f79762b5 100644 --- a/providers/common/include/internal/providercommonerr.h +++ b/providers/common/include/internal/providercommonerr.h @@ -69,6 +69,7 @@ int ERR_load_PROV_strings(void); # define PROV_R_INVALID_KEYLEN 117 # define PROV_R_INVALID_KEY_LEN 124 # define PROV_R_INVALID_KEY_LENGTH 105 +# define PROV_R_INVALID_MAC 151 # define PROV_R_INVALID_MODE 125 # define PROV_R_INVALID_MODE_INT 126 # define PROV_R_INVALID_SALT_LENGTH 112 @@ -76,6 +77,7 @@ int ERR_load_PROV_strings(void); # define PROV_R_INVALID_TAGLEN 118 # define PROV_R_MISSING_CEK_ALG 144 # define PROV_R_MISSING_KEY 128 +# define PROV_R_MISSING_MAC 150 # define PROV_R_MISSING_MESSAGE_DIGEST 129 # define PROV_R_MISSING_PASS 130 # define PROV_R_MISSING_SALT 131 diff --git a/providers/common/kdfs/build.info b/providers/common/kdfs/build.info index a881fa00b9..8a723d488d 100644 --- a/providers/common/kdfs/build.info +++ b/providers/common/kdfs/build.info @@ -1,4 +1,4 @@ -$COMMON=tls1_prf.c hkdf.c pbkdf2.c sskdf.c +$COMMON=tls1_prf.c hkdf.c kbkdf.c pbkdf2.c sskdf.c LIBS=../../../libcrypto SOURCE[../../../libcrypto]=$COMMON diff --git a/providers/common/kdfs/kbkdf.c b/providers/common/kdfs/kbkdf.c new file mode 100644 index 0000000000..77cee258e8 --- /dev/null +++ b/providers/common/kdfs/kbkdf.c @@ -0,0 +1,303 @@ +/* + * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved. + * Copyright 2019 Red Hat, Inc. + * + * Licensed under the Apache License 2.0 (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +/* + * This implements https://csrc.nist.gov/publications/detail/sp/800-108/final + * section 5.1 ("counter mode") in HMAC only. That document does not name the + * KDFs it defines; the name is derived from + * https://csrc.nist.gov/Projects/Cryptographic-Algorithm-Validation-Program/Key-Derivation + * + * Note that sections 5.2 ("feedback mode") and 5.3 ("double-pipeline mode") + * are not implemented, though it would be possible to do so in the future. + * CMAC mode is also not implemented; some plumbing would be required. + * + * These versions all assume the counter is used. It would be relatively + * straightforward to expose a configuration handle should the need arise. + * + * Variable names attempt to match those of SP800-108. + */ + +#include <stdarg.h> +#include <stdlib.h> +#include <string.h> + +#include <openssl/core_names.h> +#include <openssl/evp.h> +#include <openssl/hmac.h> +#include <openssl/kdf.h> +#include <openssl/params.h> + +#include "internal/cryptlib.h" +#include "internal/evp_int.h" +#include "internal/numbers.h" +#include "internal/provider_algs.h" +#include "internal/provider_ctx.h" +#include "internal/provider_util.h" +#include "internal/providercommonerr.h" + +#include "e_os.h" + +#define MIN(a, b) ((a) < (b)) ? (a) : (b) + +/* Our context structure. */ +typedef struct { + void *provctx; + EVP_MAC_CTX *ctx_init; + + /* Names are lowercased versions of those found in SP800-108. */ + unsigned char *ki; + size_t ki_len; + unsigned char *label; + size_t label_len; + unsigned char *context; + size_t context_len; +} KBKDF; + +/* Definitions needed for typechecking. */ +static OSSL_OP_kdf_newctx_fn kbkdf_new; +static OSSL_OP_kdf_freectx_fn kbkdf_free; +static OSSL_OP_kdf_reset_fn kbkdf_reset; +static OSSL_OP_kdf_derive_fn kbkdf_derive; +static OSSL_OP_kdf_settable_ctx_params_fn kbkdf_settable_ctx_params; +static OSSL_OP_kdf_set_ctx_params_fn kbkdf_set_ctx_params; + +/* Not all platforms have htobe32(). */ +static uint32_t be32(uint32_t host) +{ + uint32_t big = 0; + const union { + long one; + char little; + } is_endian = { 1 }; + + if (!is_endian.little) + return host; + + big |= (host & 0xff000000) >> 24; + big |= (host & 0x00ff0000) >> 8; + big |= (host & 0x0000ff00) << 8; + big |= (host & 0x000000ff) << 24; + return big; +} + +static void *kbkdf_new(void *provctx) +{ + KBKDF *ctx; + + ctx = OPENSSL_zalloc(sizeof(*ctx)); + if (ctx == NULL) { + ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE); + return NULL; + } + + ctx->provctx = provctx; + return ctx; +} + +static void kbkdf_free(void *vctx) +{ + KBKDF *ctx = (KBKDF *)vctx; + + kbkdf_reset(ctx); + OPENSSL_free(ctx); +} + +static void kbkdf_reset(void *vctx) +{ + KBKDF *ctx = (KBKDF *)vctx; + + EVP_MAC_CTX_free(ctx->ctx_init); + OPENSSL_clear_free(ctx->context, ctx->context_len); + OPENSSL_clear_free(ctx->label, ctx->label_len); + OPENSSL_clear_free(ctx->ki, ctx->ki_len); + memset(ctx, 0, sizeof(*ctx)); +} + +/* SP800-108 section 5.1. */ +static int kbkdf_derive_counter(EVP_MAC_CTX *ctx_init, + unsigned char *label, size_t label_len, + unsigned char *context, size_t context_len, + unsigned char *k_i, size_t h, uint32_t l, + unsigned char *ko, size_t ko_len) +{ + int ret = 0; + EVP_MAC_CTX *ctx = NULL; + size_t written = 0, to_write; + const unsigned char zero = 0; + uint32_t counter, i; + + for (counter = 1; written < ko_len; counter++) { + i = be32(counter); + + ctx = EVP_MAC_CTX_dup(ctx_init); + if (ctx == NULL) + goto done; + + if (!EVP_MAC_update(ctx, (unsigned char *)&i, 4) + || !EVP_MAC_update(ctx, label, label_len) + || !EVP_MAC_update(ctx, &zero, 1) + || !EVP_MAC_update(ctx, context, context_len) + || !EVP_MAC_update(ctx, (unsigned char *)&l, 4) + || !EVP_MAC_final(ctx, k_i, NULL, h)) + goto done; + + to_write = ko_len - written; + memcpy(ko + written, k_i, MIN(to_write, h)); + written += h; + + EVP_MAC_CTX_free(ctx); + ctx = NULL; + } + + ret = 1; +done: + EVP_MAC_CTX_free(ctx); + return ret; +} + +static int kbkdf_derive(void *vctx, unsigned char *key, size_t keylen) +{ + KBKDF *ctx = (KBKDF *)vctx; + int ret = 0; + unsigned char *k_i = NULL; + uint32_t l = be32(keylen * 8); + size_t h = 0; + + /* Label and Context are permitted to be empty. Check everything else. */ + if (ctx->ctx_init == NULL) { + if (ctx->ki_len == 0 || ctx->ki == NULL) { + ERR_raise(ERR_LIB_PROV, PROV_R_NO_KEY_SET); + return 0; + } + /* Could either be missing MAC or missing message digest - + * arbitrarily, I pick this one. */ + ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MAC); + return 0; + } + + h = EVP_MAC_size(ctx->ctx_init); + if (h == 0) + goto done; + + k_i = OPENSSL_zalloc(h); + if (k_i == NULL) + goto done; + + ret = kbkdf_derive_counter( + ctx->ctx_init, ctx->label, ctx->label_len, ctx->context, + ctx->context_len, k_i, h, l, key, keylen); +done: + if (ret != 1) + OPENSSL_cleanse(key, keylen); + OPENSSL_clear_free(k_i, h); + return ret; +} + +static int kbkdf_set_buffer(unsigned char **out, size_t *out_len, + const OSSL_PARAM *p) +{ + if (p->data == NULL || p->data_size == 0) + return 1; + + OPENSSL_clear_free(*out, *out_len); + *out = NULL; + return OSSL_PARAM_get_octet_string(p, (void **)out, 0, out_len); +} + +static int kbkdf_set_ctx_params(void *vctx, const OSSL_PARAM params[]) +{ + KBKDF *ctx = (KBKDF *)vctx; + OPENSSL_CTX *libctx = PROV_LIBRARY_CONTEXT_OF(ctx->provctx); + const OSSL_PARAM *p; + OSSL_PARAM mparams[2]; + + if (!ossl_prov_macctx_load_from_params(&ctx->ctx_init, params, NULL, + NULL, NULL, libctx)) + return 0; + else if (ctx->ctx_init != NULL + && !EVP_MAC_is_a(EVP_MAC_CTX_mac(ctx->ctx_init), + OSSL_MAC_NAME_HMAC)) { + ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MAC); + return 0; + } + + p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_KEY); + if (p != NULL && !kbkdf_set_buffer(&ctx->ki, &ctx->ki_len, p)) + return 0; + + p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SALT); + if (p != NULL && !kbkdf_set_buffer(&ctx->label, &ctx->label_len, p)) + return 0; + + p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_INFO); + if (p != NULL && !kbkdf_set_buffer(&ctx->context, &ctx->context_len, p)) + return 0; + + /* Set up digest context, if we can. */ + if (ctx->ctx_init != NULL && ctx->ki_len != 0) { + mparams[0] = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_KEY, + ctx->ki, ctx->ki_len); + mparams[1] = OSSL_PARAM_construct_end(); + + if (!EVP_MAC_CTX_set_params(ctx->ctx_init, mparams) + || !EVP_MAC_init(ctx->ctx_init)) + return 0; + } + + return 1; +} + +static const OSSL_PARAM *kbkdf_settable_ctx_params(void) +{ + static const OSSL_PARAM known_settable_ctx_params[] = { + OSSL_PARAM_octet_string(OSSL_KDF_PARAM_INFO, NULL, 0), + OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SALT, NULL, 0), + OSSL_PARAM_octet_string(OSSL_KDF_PARAM_KEY, NULL, 0), + OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0), + OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_MAC, NULL, 0), + + OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0), + OSSL_PARAM_END, + }; + return known_settable_ctx_params; +} + +static int kbkdf_get_ctx_params(void *vctx, OSSL_PARAM params[]) +{ + OSSL_PARAM *p; + + p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_SIZE); + if (p == NULL) + return -2; + + /* KBKDF can produce results as large as you like. */ + return OSSL_PARAM_set_size_t(p, SIZE_MAX); +} + +static const OSSL_PARAM *kbkdf_gettable_ctx_params(void) +{ + static const OSSL_PARAM known_gettable_ctx_params[] = + { OSSL_PARAM_size_t(OSSL_KDF_PARAM_SIZE, NULL), OSSL_PARAM_END }; + return known_gettable_ctx_params; +} + +const OSSL_DISPATCH kdf_kbkdf_functions[] = { + { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kbkdf_new }, + { OSSL_FUNC_KDF_FREECTX, (void(*)(void))kbkdf_free }, + { OSSL_FUNC_KDF_RESET, (void(*)(void))kbkdf_reset }, + { OSSL_FUNC_KDF_DERIVE, (void(*)(void))kbkdf_derive }, + { OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS, + (void(*)(void))kbkdf_settable_ctx_params }, + { OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kbkdf_set_ctx_params }, + { OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS, + (void(*)(void))kbkdf_gettable_ctx_params }, + { OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kbkdf_get_ctx_params }, + { 0, NULL }, +}; |