| 1 | /*
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| 2 | * Copyright 2020-2023 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/core_dispatch.h>
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| 11 | #include "prov/seeding.h"
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| 12 | #include "prov/providercommon.h"
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| 13 |
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| 14 | static OSSL_FUNC_get_entropy_fn *c_get_entropy = NULL;
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| 15 | static OSSL_FUNC_get_user_entropy_fn *c_get_user_entropy = NULL;
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| 16 | static OSSL_FUNC_cleanup_entropy_fn *c_cleanup_entropy = NULL;
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| 17 | static OSSL_FUNC_cleanup_user_entropy_fn *c_cleanup_user_entropy = NULL;
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| 18 | static OSSL_FUNC_get_nonce_fn *c_get_nonce = NULL;
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| 19 | static OSSL_FUNC_get_user_nonce_fn *c_get_user_nonce = NULL;
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| 20 | static OSSL_FUNC_cleanup_nonce_fn *c_cleanup_nonce = NULL;
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| 21 | static OSSL_FUNC_cleanup_user_nonce_fn *c_cleanup_user_nonce = NULL;
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| 22 |
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| 23 | #ifdef FIPS_MODULE
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| 24 | /*
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| 25 | * The FIPS provider uses an internal library context which is what the
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| 26 | * passed provider context references. Since the seed source is external
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| 27 | * to the FIPS provider, this is the wrong one. We need to convert this
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| 28 | * to the correct core handle before up-calling libcrypto.
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| 29 | */
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| 30 | # define CORE_HANDLE(provctx) \
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| 31 | FIPS_get_core_handle(ossl_prov_ctx_get0_libctx(provctx))
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| 32 | #else
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| 33 | /*
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| 34 | * The non-FIPS path *should* be unused because the full DRBG chain including
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| 35 | * seed source is instantiated. However, that might not apply for third
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| 36 | * party providers, so this is retained for compatibility.
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| 37 | */
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| 38 | # define CORE_HANDLE(provctx) ossl_prov_ctx_get0_handle(provctx)
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| 39 | #endif
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| 40 |
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| 41 | int ossl_prov_seeding_from_dispatch(const OSSL_DISPATCH *fns)
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| 42 | {
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| 43 | for (; fns->function_id != 0; fns++) {
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| 44 | /*
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| 45 | * We do not support the scenario of an application linked against
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| 46 | * multiple versions of libcrypto (e.g. one static and one dynamic), but
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| 47 | * sharing a single fips.so. We do a simple sanity check here.
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| 48 | */
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| 49 | #define set_func(c, f) \
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| 50 | do { if (c == NULL) c = f; else if (c != f) return 0; } while (0)
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| 51 | switch (fns->function_id) {
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| 52 | case OSSL_FUNC_GET_ENTROPY:
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| 53 | set_func(c_get_entropy, OSSL_FUNC_get_entropy(fns));
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| 54 | break;
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| 55 | case OSSL_FUNC_GET_USER_ENTROPY:
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| 56 | set_func(c_get_user_entropy, OSSL_FUNC_get_user_entropy(fns));
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| 57 | break;
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| 58 | case OSSL_FUNC_CLEANUP_ENTROPY:
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| 59 | set_func(c_cleanup_entropy, OSSL_FUNC_cleanup_entropy(fns));
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| 60 | break;
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| 61 | case OSSL_FUNC_CLEANUP_USER_ENTROPY:
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| 62 | set_func(c_cleanup_user_entropy, OSSL_FUNC_cleanup_user_entropy(fns));
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| 63 | break;
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| 64 | case OSSL_FUNC_GET_NONCE:
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| 65 | set_func(c_get_nonce, OSSL_FUNC_get_nonce(fns));
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| 66 | break;
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| 67 | case OSSL_FUNC_GET_USER_NONCE:
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| 68 | set_func(c_get_user_nonce, OSSL_FUNC_get_user_nonce(fns));
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| 69 | break;
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| 70 | case OSSL_FUNC_CLEANUP_NONCE:
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| 71 | set_func(c_cleanup_nonce, OSSL_FUNC_cleanup_nonce(fns));
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| 72 | break;
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| 73 | case OSSL_FUNC_CLEANUP_USER_NONCE:
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| 74 | set_func(c_cleanup_user_nonce, OSSL_FUNC_cleanup_user_nonce(fns));
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| 75 | break;
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| 76 | }
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| 77 | #undef set_func
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| 78 | }
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| 79 | return 1;
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| 80 | }
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| 81 |
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| 82 | size_t ossl_prov_get_entropy(PROV_CTX *prov_ctx, unsigned char **pout,
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| 83 | int entropy, size_t min_len, size_t max_len)
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| 84 | {
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| 85 | const OSSL_CORE_HANDLE *handle = CORE_HANDLE(prov_ctx);
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| 86 |
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| 87 | if (c_get_user_entropy != NULL)
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| 88 | return c_get_user_entropy(handle, pout, entropy, min_len, max_len);
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| 89 | if (c_get_entropy != NULL)
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| 90 | return c_get_entropy(handle, pout, entropy, min_len, max_len);
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| 91 | return 0;
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| 92 | }
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| 93 |
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| 94 | void ossl_prov_cleanup_entropy(PROV_CTX *prov_ctx, unsigned char *buf,
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| 95 | size_t len)
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| 96 | {
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| 97 | const OSSL_CORE_HANDLE *handle = CORE_HANDLE(prov_ctx);
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| 98 |
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| 99 | if (c_cleanup_user_entropy != NULL)
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| 100 | c_cleanup_user_entropy(handle, buf, len);
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| 101 | else if (c_cleanup_entropy != NULL)
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| 102 | c_cleanup_entropy(handle, buf, len);
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| 103 | }
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| 104 |
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| 105 | size_t ossl_prov_get_nonce(PROV_CTX *prov_ctx, unsigned char **pout,
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| 106 | size_t min_len, size_t max_len,
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| 107 | const void *salt,size_t salt_len)
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| 108 | {
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| 109 | const OSSL_CORE_HANDLE *handle = CORE_HANDLE(prov_ctx);
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| 110 |
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| 111 | if (c_get_user_nonce != NULL)
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| 112 | return c_get_user_nonce(handle, pout, min_len, max_len, salt, salt_len);
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| 113 | if (c_get_nonce != NULL)
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| 114 | return c_get_nonce(handle, pout, min_len, max_len, salt, salt_len);
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| 115 | return 0;
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| 116 | }
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| 117 |
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| 118 | void ossl_prov_cleanup_nonce(PROV_CTX *prov_ctx, unsigned char *buf, size_t len)
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| 119 | {
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| 120 | const OSSL_CORE_HANDLE *handle = CORE_HANDLE(prov_ctx);
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| 121 |
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| 122 | if (c_cleanup_user_nonce != NULL)
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| 123 | c_cleanup_user_nonce(handle, buf, len);
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| 124 | else if (c_cleanup_nonce != NULL)
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| 125 | c_cleanup_nonce(handle, buf, len);
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| 126 | }
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