mirror of https://github.com/openssl/openssl
241 lines
8.1 KiB
C
241 lines
8.1 KiB
C
/*
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* Copyright 2020 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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* 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 <openssl/core_dispatch.h>
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#include <openssl/core_names.h>
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#include <openssl/crypto.h>
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#include <openssl/params.h>
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#include <openssl/x509.h>
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#include "prov/bio.h"
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#include "prov/implementations.h"
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#include "encoder_local.h"
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static OSSL_FUNC_decoder_newctx_fn der2rsa_newctx;
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static OSSL_FUNC_decoder_freectx_fn der2key_freectx;
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static OSSL_FUNC_decoder_gettable_params_fn der2key_gettable_params;
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static OSSL_FUNC_decoder_get_params_fn der2key_get_params;
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static OSSL_FUNC_decoder_decode_fn der2key_decode;
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static OSSL_FUNC_decoder_export_object_fn der2key_export_object;
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typedef void *(extract_key_fn)(EVP_PKEY *);
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typedef void (free_key_fn)(void *);
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struct keytype_desc_st {
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int type; /* EVP key type */
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const char *name; /* Keytype */
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const OSSL_DISPATCH *fns; /* Keymgmt (to pilfer functions from) */
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/*
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* These must be the correct EVP_PKEY_get1_{TYPE}() and {TYPE}_free()
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* function for the key.
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*/
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extract_key_fn *extract_key;
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free_key_fn *free_key;
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};
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/*
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* Context used for DER to key decoding.
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*/
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struct der2key_ctx_st {
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PROV_CTX *provctx;
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const struct keytype_desc_st *desc;
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};
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static struct der2key_ctx_st *
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der2key_newctx(void *provctx, const struct keytype_desc_st *desc)
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{
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struct der2key_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
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if (ctx != NULL) {
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ctx->provctx = provctx;
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ctx->desc = desc;
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}
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return ctx;
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}
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static void der2key_freectx(void *vctx)
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{
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struct der2key_ctx_st *ctx = vctx;
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OPENSSL_free(ctx);
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}
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static const OSSL_PARAM *der2key_gettable_params(void *provctx)
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{
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static const OSSL_PARAM gettables[] = {
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{ OSSL_DECODER_PARAM_INPUT_TYPE, OSSL_PARAM_UTF8_PTR, NULL, 0, 0 },
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OSSL_PARAM_END,
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};
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return gettables;
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}
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static int der2key_get_params(OSSL_PARAM params[])
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{
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OSSL_PARAM *p;
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p = OSSL_PARAM_locate(params, OSSL_DECODER_PARAM_INPUT_TYPE);
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if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, "DER"))
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return 0;
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return 1;
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}
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static int der2key_decode(void *vctx, OSSL_CORE_BIO *cin,
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OSSL_CALLBACK *data_cb, void *data_cbarg,
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OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
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{
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struct der2key_ctx_st *ctx = vctx;
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void *libctx = PROV_LIBRARY_CONTEXT_OF(ctx->provctx);
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unsigned char *der = NULL;
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const unsigned char *derp;
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long der_len = 0;
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unsigned char *new_der = NULL;
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long new_der_len;
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EVP_PKEY *pkey = NULL;
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void *key = NULL;
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int ok = 0;
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if (!ossl_prov_read_der(ctx->provctx, cin, &der, &der_len))
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return 0;
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/*
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* Opportunistic attempt to decrypt. If it doesn't work, we try to
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* decode our input unencrypted.
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*/
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if (ossl_prov_der_from_p8(&new_der, &new_der_len, der, der_len,
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pw_cb, pw_cbarg)) {
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OPENSSL_free(der);
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der = new_der;
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der_len = new_der_len;
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}
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derp = der;
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pkey = d2i_PrivateKey_ex(ctx->desc->type, NULL, &derp, der_len,
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libctx, NULL);
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if (pkey == NULL) {
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derp = der;
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pkey = d2i_PUBKEY_ex(NULL, &derp, der_len, libctx, NULL);
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}
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if (pkey == NULL) {
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derp = der;
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pkey = d2i_KeyParams(ctx->desc->type, NULL, &derp, der_len);
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}
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if (pkey != NULL) {
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/*
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* Tear out the low-level key pointer from the pkey,
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* but only if it matches the expected key type.
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*
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* TODO(3.0): The check should be done with EVP_PKEY_is_a(), but
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* as long as we still have #legacy internal keys, it's safer to
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* use the type numbers inside the provider.
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*/
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if (EVP_PKEY_id(pkey) == ctx->desc->type)
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key = ctx->desc->extract_key(pkey);
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/*
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* ctx->desc->extract_key() is expected to have incremented |key|'s
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* reference count, so it should be safe to free |pkey| now.
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*/
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EVP_PKEY_free(pkey);
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}
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OPENSSL_free(der);
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if (key != NULL) {
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OSSL_PARAM params[3];
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params[0] =
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OSSL_PARAM_construct_utf8_string(OSSL_DECODER_PARAM_DATA_TYPE,
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(char *)ctx->desc->name, 0);
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/* The address of the key becomes the octet string */
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params[1] =
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OSSL_PARAM_construct_octet_string(OSSL_DECODER_PARAM_REFERENCE,
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&key, sizeof(key));
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params[2] = OSSL_PARAM_construct_end();
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ok = data_cb(params, data_cbarg);
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}
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ctx->desc->free_key(key);
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return ok;
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}
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static int der2key_export_object(void *vctx,
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const void *reference, size_t reference_sz,
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OSSL_CALLBACK *export_cb, void *export_cbarg)
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{
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struct der2key_ctx_st *ctx = vctx;
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OSSL_FUNC_keymgmt_export_fn *export =
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ossl_prov_get_keymgmt_export(ctx->desc->fns);
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void *keydata;
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if (reference_sz == sizeof(keydata) && export != NULL) {
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/* The contents of the reference is the address to our object */
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keydata = *(void **)reference;
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return export(keydata, OSSL_KEYMGMT_SELECT_ALL,
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export_cb, export_cbarg);
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}
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return 0;
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}
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#define IMPLEMENT_NEWCTX(KEYTYPEstr, KEYTYPE, keytype, extract, free) \
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static const struct keytype_desc_st keytype##_desc = \
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{ EVP_PKEY_##KEYTYPE, KEYTYPEstr, keytype##_keymgmt_functions, \
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(extract_key_fn *)extract, \
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(free_key_fn *)free }; \
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static void *der2##keytype##_newctx(void *provctx) \
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{ \
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return der2key_newctx(provctx, &keytype##_desc); \
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} \
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const OSSL_DISPATCH der_to_##keytype##_decoder_functions[] = { \
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{ OSSL_FUNC_DECODER_NEWCTX, \
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(void (*)(void))der2##keytype##_newctx }, \
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{ OSSL_FUNC_DECODER_FREECTX, \
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(void (*)(void))der2key_freectx }, \
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{ OSSL_FUNC_DECODER_GETTABLE_PARAMS, \
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(void (*)(void))der2key_gettable_params }, \
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{ OSSL_FUNC_DECODER_GET_PARAMS, \
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(void (*)(void))der2key_get_params }, \
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{ OSSL_FUNC_DECODER_DECODE, \
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(void (*)(void))der2key_decode }, \
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{ OSSL_FUNC_DECODER_EXPORT_OBJECT, \
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(void (*)(void))der2key_export_object }, \
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{ 0, NULL } \
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}
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#ifndef OPENSSL_NO_DH
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IMPLEMENT_NEWCTX("DH", DH, dh, EVP_PKEY_get1_DH, DH_free);
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IMPLEMENT_NEWCTX("DHX", DHX, dhx, EVP_PKEY_get1_DH, DH_free);
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#endif
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#ifndef OPENSSL_NO_DSA
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IMPLEMENT_NEWCTX("DSA", DSA, dsa, EVP_PKEY_get1_DSA, DSA_free);
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#endif
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#ifndef OPENSSL_NO_EC
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IMPLEMENT_NEWCTX("EC", EC, ec, EVP_PKEY_get1_EC_KEY, EC_KEY_free);
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IMPLEMENT_NEWCTX("X25519", X25519, x25519,
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EVP_PKEY_get1_X25519, ecx_key_free);
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IMPLEMENT_NEWCTX("X448", X448, x448,
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EVP_PKEY_get1_X448, ecx_key_free);
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IMPLEMENT_NEWCTX("ED25519", ED25519, ed25519,
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EVP_PKEY_get1_ED25519, ecx_key_free);
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IMPLEMENT_NEWCTX("ED448", ED448, ed448, EVP_PKEY_get1_ED448, ecx_key_free);
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#endif
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IMPLEMENT_NEWCTX("RSA", RSA, rsa, EVP_PKEY_get1_RSA, RSA_free);
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IMPLEMENT_NEWCTX("RSA-PSS", RSA_PSS, rsapss, EVP_PKEY_get1_RSA, RSA_free);
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