| 1 | /* $Id: x509-create-sign.cpp 105124 2024-07-03 17:50:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Crypto - X.509, Certificate Creation.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2024 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/x509.h>
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| 43 |
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| 44 | #ifdef IPRT_WITH_OPENSSL
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| 45 | # include <iprt/err.h>
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| 46 | # include <iprt/file.h>
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| 47 | # include <iprt/rand.h>
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| 48 |
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| 49 | # include "internal/iprt-openssl.h"
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| 50 | # include "internal/openssl-pre.h"
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| 51 | # include <openssl/evp.h>
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| 52 | # include <openssl/pem.h>
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| 53 | # include <openssl/x509.h>
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| 54 | # include <openssl/bio.h>
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| 55 | # include "internal/openssl-post.h"
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| 56 |
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| 57 | # if OPENSSL_VERSION_NUMBER < 0x1010000f
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| 58 | # define BIO_s_secmem BIO_s_mem
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| 59 | # endif
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| 60 |
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| 61 |
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| 62 |
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| 63 | RTDECL(int) RTCrX509Certificate_GenerateSelfSignedRsa(RTDIGESTTYPE enmDigestType, uint32_t cBits, uint32_t cSecsValidFor,
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| 64 | uint32_t fKeyUsage, uint64_t fExtKeyUsage, const char *pvSubject,
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| 65 | const char *pszCertFile, const char *pszPrivateKeyFile, PRTERRINFO pErrInfo)
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| 66 | {
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| 67 | AssertReturn(cSecsValidFor <= (uint32_t)INT32_MAX, VERR_OUT_OF_RANGE); /* larger values are not portable (win) */
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| 68 | AssertReturn(!fKeyUsage, VERR_NOT_IMPLEMENTED);
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| 69 | AssertReturn(!fExtKeyUsage, VERR_NOT_IMPLEMENTED);
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| 70 |
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| 71 | /*
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| 72 | * Translate enmDigestType.
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| 73 | */
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| 74 | const EVP_MD * const pEvpDigest = (const EVP_MD *)rtCrOpenSslConvertDigestType(enmDigestType, pErrInfo);
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| 75 | AssertReturn(pEvpDigest, pErrInfo ? pErrInfo->rc : VERR_CR_DIGEST_NOT_SUPPORTED);
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| 76 |
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| 77 | /*
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| 78 | * Create a new RSA private key.
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| 79 | */
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| 80 | # if OPENSSL_VERSION_NUMBER >= 0x30000000 /* RSA_generate_key is depreated in v3 */
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| 81 | EVP_PKEY * const pPrivateKey = EVP_RSA_gen(cBits);
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| 82 | if (!pPrivateKey)
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| 83 | return RTErrInfoSetF(pErrInfo, VERR_CR_KEY_GEN_FAILED_RSA, "EVP_RSA_gen(%u) failed", cBits);
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| 84 | # else
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| 85 | RSA * const pRsaKey = RSA_generate_key(
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| 86 | cBits, /* Number of bits for the key */
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| 87 | RSA_F4, /* Exponent - RSA_F4 is defined as 0x10001L */
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| 88 | NULL, /* Callback */
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| 89 | NULL /* Callback argument */
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| 90 | );
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| 91 | if (!pRsaKey)
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| 92 | return RTErrInfoSetF(pErrInfo, VERR_CR_KEY_GEN_FAILED_RSA, "RSA_generate_key(%u,RSA_F4,,) failed", cBits);
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| 93 |
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| 94 | EVP_PKEY * const pPrivateKey = EVP_PKEY_new();
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| 95 | if (pPrivateKey)
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| 96 | EVP_PKEY_assign_RSA(pPrivateKey, pRsaKey); /* Takes ownership of pRsaKey. */
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| 97 | else
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| 98 | {
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| 99 | RSA_free(pRsaKey);
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| 100 | return RTErrInfoSet(pErrInfo, VERR_NO_MEMORY, "EVP_PKEY_new failed");
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| 101 | }
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| 102 | # endif
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| 103 |
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| 104 | /*
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| 105 | * Construct the certificate.
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| 106 | */
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| 107 | int rc = VINF_SUCCESS;
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| 108 | X509 *pNewCert = X509_new();
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| 109 | if (pNewCert)
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| 110 | {
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| 111 | int rcOssl;
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| 112 |
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| 113 | /* Set to X509 version 1: */
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| 114 | # if 0
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| 115 | if (fKeyUsage || fExtKeyUsage)
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| 116 | rcOssl = X509_set_version(pNewCert, RTCRX509TBSCERTIFICATE_V3);
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| 117 | else
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| 118 | # endif
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| 119 | rcOssl = X509_set_version(pNewCert, RTCRX509TBSCERTIFICATE_V1);
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| 120 | AssertStmt(rcOssl > 0, rc = RTErrInfoSet(pErrInfo, VERR_GENERAL_FAILURE, "X509_set_version failed"));
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| 121 |
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| 122 | /* Set the serial number to a random number in the 1 - 1G range: */
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| 123 | rcOssl = ASN1_INTEGER_set(X509_get_serialNumber(pNewCert), RTRandU32Ex(1, UINT32_MAX / 4));
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| 124 | AssertStmt(rcOssl > 0, rc = RTErrInfoSet(pErrInfo, VERR_GENERAL_FAILURE, "X509_set_version failed"));
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| 125 |
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| 126 | /* The certificate is valid from now and the specifice number of seconds forwards: */
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| 127 | # if OPENSSL_VERSION_NUMBER >= 0x1010000f
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| 128 | AssertStmt(X509_gmtime_adj(X509_getm_notBefore(pNewCert), 0),
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| 129 | rc = RTErrInfoSet(pErrInfo, VERR_GENERAL_FAILURE, "X509_gmtime_adj/before failed"));
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| 130 | AssertStmt(X509_gmtime_adj(X509_getm_notAfter(pNewCert), cSecsValidFor),
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| 131 | rc = RTErrInfoSet(pErrInfo, VERR_GENERAL_FAILURE, "X509_gmtime_adj/after failed"));
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| 132 | # else
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| 133 | AssertStmt(X509_gmtime_adj(X509_get_notBefore(pNewCert), 0),
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| 134 | rc = RTErrInfoSet(pErrInfo, VERR_GENERAL_FAILURE, "X509_gmtime_adj/before failed"));
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| 135 | AssertStmt(X509_gmtime_adj(X509_get_notAfter(pNewCert), cSecsValidFor),
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| 136 | rc = RTErrInfoSet(pErrInfo, VERR_GENERAL_FAILURE, "X509_gmtime_adj/after failed"));
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| 137 | # endif
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| 138 |
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| 139 | /* Set the public key (part of the private): */
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| 140 | rcOssl = X509_set_pubkey(pNewCert, pPrivateKey);
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| 141 | AssertStmt(rcOssl > 0, rc = RTErrInfoSet(pErrInfo, VERR_GENERAL_FAILURE, "X509_set_pubkey failed"));
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| 142 |
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| 143 | # if 0
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| 144 | /* Set key usage. */
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| 145 | if (fKeyUsage)
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| 146 | {
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| 147 | }
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| 148 | /* Set extended key usage. */
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| 149 | if (fExtKeyUsage)
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| 150 | {
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| 151 | }
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| 152 | # endif
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| 153 | /** @todo set other certificate attributes? */
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| 154 |
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| 155 |
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| 156 | /** @todo check what the subject name is... Offer way to specify it? */
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| 157 |
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| 158 | /* Make it self signed: */
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| 159 | X509_NAME *pX509Name = X509_get_subject_name(pNewCert);
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| 160 | rcOssl = X509_NAME_add_entry_by_txt(pX509Name, "CN", MBSTRING_ASC, (unsigned char *) pvSubject, -1, -1, 0);
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| 161 | AssertStmt(rcOssl > 0, rc = RTErrInfoSet(pErrInfo, VERR_GENERAL_FAILURE, "X509_NAME_add_entry_by_txt failed"));
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| 162 | rcOssl = X509_set_issuer_name(pNewCert, pX509Name);
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| 163 | AssertStmt(rcOssl > 0, rc = RTErrInfoSet(pErrInfo, VERR_GENERAL_FAILURE, "X509_set_issuer_name failed"));
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| 164 |
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| 165 | if (RT_SUCCESS(rc))
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| 166 | {
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| 167 | /*
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| 168 | * Sign the certificate.
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| 169 | */
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| 170 | rcOssl = X509_sign(pNewCert, pPrivateKey, pEvpDigest);
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| 171 | if (rcOssl > 0)
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| 172 | {
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| 173 | /*
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| 174 | * Write out the result to the two files.
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| 175 | */
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| 176 | /* The certificate (not security sensitive). */
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| 177 | BIO * const pCertBio = BIO_new(BIO_s_mem());
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| 178 | if (pCertBio)
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| 179 | {
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| 180 | rcOssl = PEM_write_bio_X509(pCertBio, pNewCert);
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| 181 | if (rcOssl > 0)
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| 182 | rc = rtCrOpenSslWriteMemBioToNewFile(pCertBio, pszCertFile, pErrInfo);
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| 183 | else
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| 184 | rc = RTErrInfoSet(pErrInfo, VERR_CR_KEY_GEN_FAILED_RSA, "PEM_write_bio_X509 failed");
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| 185 | BIO_free(pCertBio);
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| 186 | }
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| 187 | else
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| 188 | rc = VERR_NO_MEMORY;
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| 189 |
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| 190 | if (RT_SUCCESS(rc))
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| 191 | {
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| 192 | /* The private key as plain text (security sensitive, thus last). */
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| 193 | BIO * const pPkBio = BIO_new(BIO_s_secmem());
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| 194 | if (pPkBio)
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| 195 | {
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| 196 | rcOssl = PEM_write_bio_PrivateKey(pPkBio, pPrivateKey,
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| 197 | NULL /*enc*/, NULL /*kstr*/, 0 /*klen*/, NULL /*cb*/, NULL /*u*/);
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| 198 | if (rcOssl > 0)
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| 199 | rc = rtCrOpenSslWriteMemBioToNewFile(pPkBio, pszPrivateKeyFile, pErrInfo);
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| 200 | else
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| 201 | rc = RTErrInfoSet(pErrInfo, VERR_CR_KEY_GEN_FAILED_RSA, "PEM_write_bio_PrivateKey failed");
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| 202 | BIO_free(pPkBio);
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| 203 | }
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| 204 | else
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| 205 | rc = VERR_NO_MEMORY;
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| 206 | if (RT_FAILURE(rc))
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| 207 | RTFileDelete(pszCertFile);
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| 208 | }
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| 209 | }
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| 210 | else
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| 211 | rc = RTErrInfoSet(pErrInfo, VERR_CR_KEY_GEN_FAILED_RSA, "X509_sign failed");
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| 212 | }
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| 213 |
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| 214 | X509_free(pNewCert);
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| 215 | }
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| 216 | else
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| 217 | rc = RTErrInfoSet(pErrInfo, VERR_NO_MEMORY, "X509_new failed");
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| 218 |
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| 219 | EVP_PKEY_free(pPrivateKey);
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| 220 | return rc;
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| 221 | }
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| 222 |
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| 223 | #endif /* IPRT_WITH_OPENSSL */
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