| 1 | /* $Id: pkix-verify.cpp 100442 2023-07-08 11:10:51Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Crypto - Public Key Infrastructure API, Verification.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #include "internal/iprt.h"
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| 42 | #include <iprt/crypto/pkix.h>
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| 43 |
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| 44 | #include <iprt/err.h>
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| 45 | #include <iprt/string.h>
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| 46 | #include <iprt/crypto/digest.h>
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| 47 | #include <iprt/crypto/key.h>
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| 48 |
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| 49 | #ifdef IPRT_WITH_OPENSSL
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| 50 | # include "internal/iprt-openssl.h"
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| 51 | # include "internal/openssl-pre.h"
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| 52 | # include <openssl/evp.h>
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| 53 | # include "internal/openssl-post.h"
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| 54 | # ifndef OPENSSL_VERSION_NUMBER
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| 55 | # error "Missing OPENSSL_VERSION_NUMBER!"
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| 56 | # endif
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| 57 | #endif
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| 58 |
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| 59 |
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| 60 |
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| 61 | RTDECL(int) RTCrPkixPubKeyVerifySignature(PCRTASN1OBJID pAlgorithm, RTCRKEY hPublicKey, PCRTASN1DYNTYPE pParameters,
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| 62 | PCRTASN1BITSTRING pSignatureValue, const void *pvData, size_t cbData,
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| 63 | PRTERRINFO pErrInfo)
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| 64 | {
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| 65 | /*
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| 66 | * Valid input.
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| 67 | */
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| 68 | AssertPtrReturn(pAlgorithm, VERR_INVALID_POINTER);
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| 69 | AssertReturn(RTAsn1ObjId_IsPresent(pAlgorithm), VERR_INVALID_POINTER);
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| 70 |
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| 71 | AssertPtrReturn(hPublicKey, VERR_INVALID_POINTER);
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| 72 | Assert(RTCrKeyHasPublicPart(hPublicKey));
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| 73 | RTCRKEYTYPE const enmKeyType = RTCrKeyGetType(hPublicKey);
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| 74 | AssertReturn(enmKeyType != RTCRKEYTYPE_INVALID, VERR_INVALID_HANDLE);
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| 75 |
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| 76 | AssertPtrReturn(pSignatureValue, VERR_INVALID_POINTER);
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| 77 | AssertReturn(RTAsn1BitString_IsPresent(pSignatureValue), VERR_INVALID_POINTER);
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| 78 |
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| 79 | AssertPtrReturn(pvData, VERR_INVALID_POINTER);
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| 80 | AssertReturn(cbData > 0, VERR_INVALID_PARAMETER);
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| 81 |
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| 82 | /*
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| 83 | * Verify that the parameters are compatible with the key. We ASSUME the
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| 84 | * parameters are for a hash+cryption combination, like those found in
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| 85 | * RTCRX509TBSCERTIFICATE::Signature. At present, these should NULL (or
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| 86 | * absent) for the two key types we support RSA & ECDSA, which is an
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| 87 | * ASSUMPTION by the OpenSSL code below.
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| 88 | */
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| 89 | int rcIprt = RTCrKeyVerifyParameterCompatibility(hPublicKey, pParameters, true /*fForSignature*/, pAlgorithm, pErrInfo);
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| 90 | AssertRCReturn(rcIprt, rcIprt);
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| 91 |
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| 92 | /*
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| 93 | * Validate using IPRT.
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| 94 | */
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| 95 | RTCRPKIXSIGNATURE hSignature;
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| 96 | rcIprt = RTCrPkixSignatureCreateByObjId(&hSignature, pAlgorithm, hPublicKey, pParameters, false /*fSigning*/);
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| 97 | if (RT_FAILURE(rcIprt))
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| 98 | return RTErrInfoSetF(pErrInfo, VERR_CR_PKIX_CIPHER_ALGO_NOT_KNOWN,
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| 99 | "Unknown public key algorithm [IPRT %Rrc]: %s", rcIprt, pAlgorithm->szObjId);
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| 100 |
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| 101 | RTCRDIGEST hDigest;
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| 102 | rcIprt = RTCrDigestCreateByObjId(&hDigest, pAlgorithm);
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| 103 | if (RT_SUCCESS(rcIprt))
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| 104 | {
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| 105 | /* Calculate the digest. */
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| 106 | rcIprt = RTCrDigestUpdate(hDigest, pvData, cbData);
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| 107 | if (RT_SUCCESS(rcIprt))
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| 108 | {
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| 109 | rcIprt = RTCrPkixSignatureVerifyBitString(hSignature, hDigest, pSignatureValue);
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| 110 | if (RT_FAILURE(rcIprt))
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| 111 | RTErrInfoSet(pErrInfo, rcIprt, "RTCrPkixSignatureVerifyBitString failed");
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| 112 | }
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| 113 | else
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| 114 | RTErrInfoSet(pErrInfo, rcIprt, "RTCrDigestUpdate failed");
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| 115 | RTCrDigestRelease(hDigest);
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| 116 | }
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| 117 | else
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| 118 | RTErrInfoSetF(pErrInfo, rcIprt, "Unknown digest algorithm [IPRT]: %s", pAlgorithm->szObjId);
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| 119 | RTCrPkixSignatureRelease(hSignature);
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| 120 |
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| 121 | #ifdef IPRT_WITH_OPENSSL
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| 122 | /* We don't implement digest+cipher parameters in OpenSSL (or at all),
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| 123 | RTCrKeyVerifyParameterCompatibility should ensure we don't get here
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| 124 | (ASSUMING only RSA and ECDSA keys). But, just in case, bail out if we do. */
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| 125 | AssertReturn( !pParameters
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| 126 | || pParameters->enmType == RTASN1TYPE_NULL
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| 127 | || pParameters->enmType == RTASN1TYPE_NOT_PRESENT,
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| 128 | VERR_CR_PKIX_CIPHER_ALGO_PARAMS_NOT_IMPL);
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| 129 |
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| 130 | /*
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| 131 | * Validate using OpenSSL EVP.
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| 132 | */
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| 133 | /* Create an EVP public key. */
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| 134 | EVP_PKEY *pEvpPublicKey = NULL;
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| 135 | const EVP_MD *pEvpMdType = NULL;
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| 136 | int rcOssl = rtCrKeyToOpenSslKeyEx(hPublicKey, true /*fNeedPublic*/, pAlgorithm->szObjId,
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| 137 | (void **)&pEvpPublicKey, (const void **)&pEvpMdType, pErrInfo);
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| 138 | if (RT_SUCCESS(rcOssl))
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| 139 | {
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| 140 | EVP_MD_CTX *pEvpMdCtx = EVP_MD_CTX_create();
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| 141 | if (pEvpMdCtx)
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| 142 | {
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| 143 | if (EVP_VerifyInit_ex(pEvpMdCtx, pEvpMdType, NULL /*engine*/))
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| 144 | {
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| 145 | /* Digest the data. */
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| 146 | EVP_VerifyUpdate(pEvpMdCtx, pvData, cbData);
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| 147 |
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| 148 | /* Verify the signature. */
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| 149 | if (EVP_VerifyFinal(pEvpMdCtx,
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| 150 | RTASN1BITSTRING_GET_BIT0_PTR(pSignatureValue),
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| 151 | RTASN1BITSTRING_GET_BYTE_SIZE(pSignatureValue),
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| 152 | pEvpPublicKey) > 0)
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| 153 | rcOssl = VINF_SUCCESS;
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| 154 | else
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| 155 | rcOssl = RTErrInfoSet(pErrInfo, VERR_CR_PKIX_OSSL_VERIFY_FINAL_FAILED, "EVP_VerifyFinal failed");
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| 156 |
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| 157 | /* Cleanup and return: */
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| 158 | }
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| 159 | else
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| 160 | rcOssl = RTErrInfoSetF(pErrInfo, VERR_CR_PKIX_OSSL_CIPHER_ALOG_INIT_FAILED,
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| 161 | "EVP_VerifyInit_ex failed (algorithm type is %s)", pAlgorithm->szObjId);
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| 162 | EVP_MD_CTX_destroy(pEvpMdCtx);
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| 163 | }
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| 164 | else
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| 165 | rcOssl = RTErrInfoSetF(pErrInfo, VERR_NO_MEMORY, "EVP_MD_CTX_create failed");
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| 166 | EVP_PKEY_free(pEvpPublicKey);
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| 167 | }
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| 168 |
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| 169 | /*
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| 170 | * Check the result.
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| 171 | */
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| 172 | if ( (RT_SUCCESS(rcIprt) && RT_SUCCESS(rcOssl))
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| 173 | || (RT_FAILURE_NP(rcIprt) && RT_FAILURE_NP(rcOssl))
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| 174 | || (RT_SUCCESS(rcIprt) && rcOssl == VERR_CR_PKIX_OSSL_CIPHER_ALGO_NOT_KNOWN_EVP) )
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| 175 | return rcIprt;
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| 176 | AssertMsgFailed(("rcIprt=%Rrc rcOssl=%Rrc\n", rcIprt, rcOssl));
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| 177 | if (RT_FAILURE_NP(rcOssl))
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| 178 | return rcOssl;
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| 179 | #endif /* IPRT_WITH_OPENSSL */
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| 180 |
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| 181 | return rcIprt;
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| 182 | }
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| 183 |
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| 184 |
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| 185 | RTDECL(int) RTCrPkixPubKeyVerifySignedDigest(PCRTASN1OBJID pAlgorithm, RTCRKEY hPublicKey, PCRTASN1DYNTYPE pParameters,
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| 186 | void const *pvSignedDigest, size_t cbSignedDigest, RTCRDIGEST hDigest,
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| 187 | PRTERRINFO pErrInfo)
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| 188 | {
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| 189 | /*
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| 190 | * Valid input.
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| 191 | */
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| 192 | AssertPtrReturn(pAlgorithm, VERR_INVALID_POINTER);
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| 193 | AssertReturn(RTAsn1ObjId_IsPresent(pAlgorithm), VERR_INVALID_POINTER);
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| 194 |
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| 195 | AssertPtrReturn(hPublicKey, VERR_INVALID_POINTER);
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| 196 | Assert(RTCrKeyHasPublicPart(hPublicKey));
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| 197 | RTCRKEYTYPE const enmKeyType = RTCrKeyGetType(hPublicKey);
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| 198 | AssertReturn(enmKeyType != RTCRKEYTYPE_INVALID, VERR_INVALID_HANDLE);
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| 199 |
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| 200 | AssertPtrReturn(pvSignedDigest, VERR_INVALID_POINTER);
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| 201 | AssertReturn(cbSignedDigest, VERR_INVALID_PARAMETER);
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| 202 |
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| 203 | AssertPtrReturn(hDigest, VERR_INVALID_HANDLE);
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| 204 |
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| 205 | /*
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| 206 | * Verify that the parameters are compatible with the key. We ASSUME the
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| 207 | * parameters are for a hash+cryption combination, like those found in
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| 208 | * RTCRX509TBSCERTIFICATE::Signature. At present, these should NULL (or
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| 209 | * absent) for the two key types we support RSA & ECDSA, which is an
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| 210 | * ASSUMPTION by the OpenSSL code below.
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| 211 | */
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| 212 | int rcIprt = RTCrKeyVerifyParameterCompatibility(hPublicKey, pParameters, true /*fForSignature*/, pAlgorithm, pErrInfo);
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| 213 | AssertRCReturn(rcIprt, rcIprt);
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| 214 |
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| 215 | /*
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| 216 | * Validate using IPRT.
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| 217 | */
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| 218 | RTCRPKIXSIGNATURE hSignature;
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| 219 | rcIprt = RTCrPkixSignatureCreateByObjId(&hSignature, pAlgorithm, hPublicKey, pParameters, false /*fSigning*/);
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| 220 | if (RT_FAILURE(rcIprt))
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| 221 | return RTErrInfoSetF(pErrInfo, VERR_CR_PKIX_CIPHER_ALGO_NOT_KNOWN,
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| 222 | "Unknown public key algorithm [IPRT %Rrc]: %s", rcIprt, pAlgorithm->szObjId);
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| 223 |
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| 224 | rcIprt = RTCrPkixSignatureVerify(hSignature, hDigest, pvSignedDigest, cbSignedDigest);
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| 225 | if (RT_FAILURE(rcIprt))
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| 226 | RTErrInfoSet(pErrInfo, rcIprt, "RTCrPkixSignatureVerifyBitString failed");
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| 227 |
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| 228 | RTCrPkixSignatureRelease(hSignature);
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| 229 |
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| 230 | #if defined(IPRT_WITH_OPENSSL) \
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| 231 | && (OPENSSL_VERSION_NUMBER > 0x10000000L) /* 0.9.8 doesn't seem to have EVP_PKEY_CTX_set_signature_md. */
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| 232 | /*
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| 233 | * Validate using OpenSSL EVP.
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| 234 | */
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| 235 | /* Make sure the algorithm includes the digest and isn't just RSA, ECDSA or similar. */
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| 236 | const char *pszAlgObjId = RTCrX509AlgorithmIdentifier_CombineEncryptionOidAndDigestOid(pAlgorithm->szObjId,
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| 237 | RTCrDigestGetAlgorithmOid(hDigest));
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| 238 | AssertMsgStmt(pszAlgObjId, ("enc=%s hash=%s\n", pAlgorithm->szObjId, RTCrDigestGetAlgorithmOid(hDigest)),
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| 239 | pszAlgObjId = RTCrDigestGetAlgorithmOid(hDigest));
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| 240 |
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| 241 | /* We don't implement digest+cipher parameters in OpenSSL (or at all),
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| 242 | RTCrKeyVerifyParameterCompatibility should ensure we don't get here
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| 243 | (ASSUMING only RSA and ECDSA keys). But, just in case, bail out if we do. */
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| 244 | AssertReturn( !pParameters
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| 245 | || pParameters->enmType == RTASN1TYPE_NULL
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| 246 | || pParameters->enmType == RTASN1TYPE_NOT_PRESENT,
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| 247 | VERR_CR_PKIX_CIPHER_ALGO_PARAMS_NOT_IMPL);
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| 248 |
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| 249 | /* Create an EVP public key. */
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| 250 | EVP_PKEY *pEvpPublicKey = NULL;
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| 251 | const EVP_MD *pEvpMdType = NULL;
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| 252 | int rcOssl = rtCrKeyToOpenSslKeyEx(hPublicKey, true /*fNeedPublic*/, pszAlgObjId,
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| 253 | (void **)&pEvpPublicKey, (const void **)&pEvpMdType, pErrInfo);
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| 254 | if (RT_SUCCESS(rcOssl))
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| 255 | {
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| 256 | /* Create an EVP public key context we can use to validate the digest. */
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| 257 | EVP_PKEY_CTX *pEvpPKeyCtx = EVP_PKEY_CTX_new(pEvpPublicKey, NULL);
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| 258 | if (pEvpPKeyCtx)
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| 259 | {
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| 260 | rcOssl = EVP_PKEY_verify_init(pEvpPKeyCtx);
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| 261 | if (rcOssl > 0)
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| 262 | {
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| 263 | rcOssl = EVP_PKEY_CTX_set_signature_md(pEvpPKeyCtx, pEvpMdType);
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| 264 | if (rcOssl > 0)
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| 265 | {
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| 266 | /* Get the digest from hDigest and verify it. */
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| 267 | rcOssl = EVP_PKEY_verify(pEvpPKeyCtx,
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| 268 | (uint8_t const *)pvSignedDigest,
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| 269 | cbSignedDigest,
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| 270 | RTCrDigestGetHash(hDigest),
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| 271 | RTCrDigestGetHashSize(hDigest));
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| 272 | if (rcOssl > 0)
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| 273 | rcOssl = VINF_SUCCESS;
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| 274 | else
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| 275 | rcOssl = RTErrInfoSetF(pErrInfo, VERR_CR_PKIX_OSSL_VERIFY_FINAL_FAILED,
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| 276 | "EVP_PKEY_verify failed (%d)", rcOssl);
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| 277 | /* Cleanup and return: */
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| 278 | }
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| 279 | else
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| 280 | rcOssl = RTErrInfoSetF(pErrInfo, VERR_CR_PKIX_OSSL_EVP_PKEY_TYPE_ERROR,
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| 281 | "EVP_PKEY_CTX_set_signature_md failed (%d)", rcOssl);
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| 282 | }
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| 283 | else
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| 284 | rcOssl = RTErrInfoSetF(pErrInfo, VERR_CR_PKIX_OSSL_EVP_PKEY_TYPE_ERROR,
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| 285 | "EVP_PKEY_verify_init failed (%d)", rcOssl);
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| 286 | EVP_PKEY_CTX_free(pEvpPKeyCtx);
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| 287 | }
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| 288 | else
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| 289 | rcOssl = RTErrInfoSet(pErrInfo, VERR_CR_PKIX_OSSL_EVP_PKEY_TYPE_ERROR, "EVP_PKEY_CTX_new failed");
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| 290 | EVP_PKEY_free(pEvpPublicKey);
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| 291 | }
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| 292 |
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| 293 | /*
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| 294 | * Check the result.
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| 295 | */
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| 296 | if ( (RT_SUCCESS(rcIprt) && RT_SUCCESS(rcOssl))
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| 297 | || (RT_FAILURE_NP(rcIprt) && RT_FAILURE_NP(rcOssl))
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| 298 | || (RT_SUCCESS(rcIprt) && rcOssl == VERR_CR_PKIX_OSSL_CIPHER_ALGO_NOT_KNOWN_EVP) )
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| 299 | return rcIprt;
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| 300 | AssertMsgFailed(("rcIprt=%Rrc rcOssl=%Rrc\n", rcIprt, rcOssl));
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| 301 | if (RT_FAILURE_NP(rcOssl))
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| 302 | return rcOssl;
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| 303 | #endif /* IPRT_WITH_OPENSSL */
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| 304 |
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| 305 | return rcIprt;
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| 306 | }
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| 307 |
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| 308 |
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| 309 | RTDECL(int) RTCrPkixPubKeyVerifySignedDigestByCertPubKeyInfo(PCRTCRX509SUBJECTPUBLICKEYINFO pCertPubKeyInfo,
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| 310 | void const *pvSignedDigest, size_t cbSignedDigest,
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| 311 | RTCRDIGEST hDigest, PRTERRINFO pErrInfo)
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| 312 | {
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| 313 | RTCRKEY hPublicKey;
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| 314 | int rc = RTCrKeyCreateFromPublicAlgorithmAndBits(&hPublicKey, &pCertPubKeyInfo->Algorithm.Algorithm,
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| 315 | &pCertPubKeyInfo->Algorithm.Parameters,
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| 316 | &pCertPubKeyInfo->SubjectPublicKey, pErrInfo, NULL);
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| 317 | if (RT_SUCCESS(rc))
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| 318 | {
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| 319 | /** @todo r=bird (2023-07-06): This ASSUMES no digest+cipher parameters, which
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| 320 | * is the case for RSA and ECDSA. */
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| 321 | rc = RTCrPkixPubKeyVerifySignedDigest(&pCertPubKeyInfo->Algorithm.Algorithm, hPublicKey, NULL,
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| 322 | pvSignedDigest, cbSignedDigest, hDigest, pErrInfo);
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| 323 |
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| 324 | uint32_t cRefs = RTCrKeyRelease(hPublicKey);
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| 325 | Assert(cRefs == 0); RT_NOREF(cRefs);
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| 326 | }
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| 327 | return rc;
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| 328 | }
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| 329 |
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