pkcs7-verify.cpp@ 98103

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1	/* $Id: pkcs7-verify.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2	/** @file
3	* IPRT - Crypto - PKCS \#7, Verification
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* The contents of this file may alternatively be used under the terms
26	* of the Common Development and Distribution License Version 1.0
27	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	* in the VirtualBox distribution, in which case the provisions of the
29	* CDDL are applicable instead of those of the GPL.
30	*
31	* You may elect to license modified versions of this file under the
32	* terms and conditions of either the GPL or the CDDL or both.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	*/
36
37
38	/*********************************************************************************************************************************
39	* Header Files *
40	*********************************************************************************************************************************/
41	#include "internal/iprt.h"
42	#include <iprt/crypto/pkcs7.h>
43
44	#include <iprt/err.h>
45	#include <iprt/mem.h>
46	#include <iprt/string.h>
47	#include <iprt/crypto/digest.h>
48	#include <iprt/crypto/key.h>
49	#include <iprt/crypto/pkix.h>
50	#include <iprt/crypto/store.h>
51	#include <iprt/crypto/x509.h>
52
53	#ifdef IPRT_WITH_OPENSSL
54	# include "internal/iprt-openssl.h"
55	# include "internal/openssl-pre.h"
56	# include <openssl/pkcs7.h>
57	# include <openssl/x509.h>
58	# include <openssl/err.h>
59	# include "internal/openssl-post.h"
60	#endif
61
62
63
64	#ifdef IPRT_WITH_OPENSSL
65	static int rtCrPkcs7VerifySignedDataUsingOpenSsl(PCRTCRPKCS7CONTENTINFO pContentInfo, uint32_t fFlags,
66	RTCRSTORE hAdditionalCerts, RTCRSTORE hTrustedCerts,
67	void const *pvContent, size_t cbContent, PRTERRINFO pErrInfo)
68	{
69	RT_NOREF_PV(fFlags);
70
71	/*
72	* Verify using OpenSSL. ERR_PUT_error
73	*/
74	unsigned char const *pbRawContent;
75	uint32_t cbRawContent;
76	void *pvFree;
77	int rcOssl = RTAsn1EncodeQueryRawBits(RTCrPkcs7ContentInfo_GetAsn1Core(pContentInfo),
78	(const uint8_t **)&pbRawContent, &cbRawContent, &pvFree, pErrInfo);
79	AssertRCReturn(rcOssl, rcOssl);
80
81	PKCS7 *pOsslPkcs7 = NULL;
82	PKCS7 *pOsslPkcs7Ret = d2i_PKCS7(&pOsslPkcs7, &pbRawContent, cbRawContent);
83
84	RTMemTmpFree(pvFree);
85
86	if (pOsslPkcs7 != NULL && pOsslPkcs7Ret == pOsslPkcs7)
87	{
88	STACK_OF(X509) *pAddCerts = NULL;
89	if (hAdditionalCerts != NIL_RTCRSTORE)
90	rcOssl = RTCrStoreConvertToOpenSslCertStack(hAdditionalCerts, 0, (void **)&pAddCerts, pErrInfo);
91	else
92	{
93	pAddCerts = sk_X509_new_null();
94	rcOssl = RT_LIKELY(pAddCerts != NULL) ? VINF_SUCCESS : VERR_NO_MEMORY;
95	}
96	if (RT_SUCCESS(rcOssl))
97	{
98	PCRTCRPKCS7SETOFCERTS pCerts = &pContentInfo->u.pSignedData->Certificates;
99	for (uint32_t i = 0; i < pCerts->cItems; i++)
100	if (pCerts->papItems[i]->enmChoice == RTCRPKCS7CERTCHOICE_X509)
101	rtCrOpenSslAddX509CertToStack(pAddCerts, pCerts->papItems[i]->u.pX509Cert, NULL);
102
103	X509_STORE *pTrustedCerts = NULL;
104	if (hTrustedCerts != NIL_RTCRSTORE)
105	rcOssl = RTCrStoreConvertToOpenSslCertStore(hTrustedCerts, 0, (void **)&pTrustedCerts, pErrInfo);
106	if (RT_SUCCESS(rcOssl))
107	{
108	rtCrOpenSslInit();
109
110	BIO pBioContent = BIO_new_mem_buf((void )pvContent, (int)cbContent);
111	if (pBioContent)
112	{
113	uint32_t fOsslFlags = PKCS7_NOCHAIN;
114	fOsslFlags \|= PKCS7_NOVERIFY; // temporary hack.
115	if (PKCS7_verify(pOsslPkcs7, pAddCerts, pTrustedCerts, pBioContent, NULL /out/, fOsslFlags))
116	rcOssl = VINF_SUCCESS;
117	else
118	{
119	rcOssl = RTErrInfoSet(pErrInfo, VERR_CR_PKCS7_OSSL_VERIFY_FAILED, "PKCS7_verify failed: ");
120	if (pErrInfo)
121	ERR_print_errors_cb(rtCrOpenSslErrInfoCallback, pErrInfo);
122	}
123	BIO_free(pBioContent);
124	}
125	if (pTrustedCerts)
126	X509_STORE_free(pTrustedCerts);
127	}
128	else
129	rcOssl = RTErrInfoSet(pErrInfo, rcOssl, "RTCrStoreConvertToOpenSslCertStore failed");
130	#include "internal/openssl-pre.h" /* Need to disable C5039 warning here. */
131	if (pAddCerts)
132	sk_X509_pop_free(pAddCerts, X509_free);
133	#include "internal/openssl-post.h"
134	}
135	else
136	rcOssl = RTErrInfoSet(pErrInfo, rcOssl, "RTCrStoreConvertToOpenSslCertStack failed");
137	PKCS7_free(pOsslPkcs7);
138	}
139	else
140	{
141	rcOssl = RTErrInfoSet(pErrInfo, VERR_CR_PKCS7_OSSL_D2I_FAILED, "d2i_PKCS7 failed");
142	if (pErrInfo)
143	ERR_print_errors_cb(rtCrOpenSslErrInfoCallback, pErrInfo);
144	}
145
146	return rcOssl;
147	}
148	#endif /* IPRT_WITH_OPENSSL */
149
150
151
152	static int rtCrPkcs7VerifyCertUsageTimstamping(PCRTCRX509CERTIFICATE pCert, PRTERRINFO pErrInfo)
153	{
154	if (!(pCert->TbsCertificate.T3.fFlags & RTCRX509TBSCERTIFICATE_F_PRESENT_EXT_KEY_USAGE))
155	return RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_KEY_USAGE_MISMATCH, "No extended key usage certificate attribute.");
156	if (!(pCert->TbsCertificate.T3.fExtKeyUsage & (RTCRX509CERT_EKU_F_TIMESTAMPING \| RTCRX509CERT_EKU_F_MS_TIMESTAMP_SIGNING)))
157	return RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_KEY_USAGE_MISMATCH, "fExtKeyUsage=%#x, missing %#x (time stamping)",
158	pCert->TbsCertificate.T3.fExtKeyUsage,
159	RTCRX509CERT_EKU_F_TIMESTAMPING \| RTCRX509CERT_EKU_F_MS_TIMESTAMP_SIGNING);
160	return VINF_SUCCESS;
161	}
162
163
164	static int rtCrPkcs7VerifyCertUsageDigitalSignature(PCRTCRX509CERTIFICATE pCert, PRTERRINFO pErrInfo)
165	{
166	if ( (pCert->TbsCertificate.T3.fFlags & RTCRX509TBSCERTIFICATE_F_PRESENT_KEY_USAGE)
167	&& !(pCert->TbsCertificate.T3.fKeyUsage & RTCRX509CERT_KEY_USAGE_F_DIGITAL_SIGNATURE))
168	return RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_KEY_USAGE_MISMATCH, "fKeyUsage=%#x, missing %#x",
169	pCert->TbsCertificate.T3.fKeyUsage, RTCRX509CERT_KEY_USAGE_F_DIGITAL_SIGNATURE);
170	return VINF_SUCCESS;
171	}
172
173
174	/**
175	* @callback_method_impl{RTCRPKCS7VERIFYCERTCALLBACK,
176	* Default implementation that checks for the DigitalSignature KeyUsage bit.}
177	*/
178	RTDECL(int) RTCrPkcs7VerifyCertCallbackDefault(PCRTCRX509CERTIFICATE pCert, RTCRX509CERTPATHS hCertPaths, uint32_t fFlags,
179	void *pvUser, PRTERRINFO pErrInfo)
180	{
181	RT_NOREF_PV(hCertPaths); RT_NOREF_PV(pvUser);
182	int rc = VINF_SUCCESS;
183
184	if (fFlags & RTCRPKCS7VCC_F_SIGNED_DATA)
185	rc = rtCrPkcs7VerifyCertUsageDigitalSignature(pCert, pErrInfo);
186
187	if ( (fFlags & RTCRPKCS7VCC_F_TIMESTAMP)
188	&& RT_SUCCESS(rc))
189	rc = rtCrPkcs7VerifyCertUsageTimstamping(pCert, pErrInfo);
190
191	return rc;
192	}
193
194
195	/**
196	* @callback_method_impl{RTCRPKCS7VERIFYCERTCALLBACK,
197	* Standard code signing. Use this for Microsoft SPC.}
198	*/
199	RTDECL(int) RTCrPkcs7VerifyCertCallbackCodeSigning(PCRTCRX509CERTIFICATE pCert, RTCRX509CERTPATHS hCertPaths, uint32_t fFlags,
200	void *pvUser, PRTERRINFO pErrInfo)
201	{
202	RT_NOREF_PV(hCertPaths); RT_NOREF_PV(pvUser);
203	int rc = VINF_SUCCESS;
204	if (fFlags & RTCRPKCS7VCC_F_SIGNED_DATA)
205	{
206	/*
207	* If KeyUsage is present it must include digital signature.
208	*/
209	rc = rtCrPkcs7VerifyCertUsageDigitalSignature(pCert, pErrInfo);
210	if (RT_SUCCESS(rc))
211	{
212	/*
213	* The extended usage 'code signing' must be present.
214	*/
215	if (!(pCert->TbsCertificate.T3.fFlags & RTCRX509TBSCERTIFICATE_F_PRESENT_EXT_KEY_USAGE))
216	return RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_KEY_USAGE_MISMATCH, "No extended key usage certificate attribute.");
217	if (!(pCert->TbsCertificate.T3.fExtKeyUsage & RTCRX509CERT_EKU_F_CODE_SIGNING))
218	return RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_KEY_USAGE_MISMATCH, "fExtKeyUsage=%#RX64, missing CODE_SIGNING (%#RX64)",
219	pCert->TbsCertificate.T3.fExtKeyUsage, RTCRX509CERT_EKU_F_CODE_SIGNING);
220	}
221	}
222
223	/*
224	* Timestamping too?
225	*/
226	if ( (fFlags & RTCRPKCS7VCC_F_TIMESTAMP)
227	&& RT_SUCCESS(rc))
228	rc = rtCrPkcs7VerifyCertUsageTimstamping(pCert, pErrInfo);
229
230	return rc;
231	}
232
233
234	/**
235	* Deals with authenticated attributes.
236	*
237	* When authenticated attributes are present (checked by caller) we must:
238	* - fish out the content type and check it against the content inof,
239	* - fish out the message digest among and check it against *phDigest,
240	* - compute the message digest of the authenticated attributes and
241	* replace *phDigest with this for the signature verification.
242	*
243	* @returns IPRT status code.
244	* @param pSignerInfo The signer info being verified.
245	* @param pSignedData The signed data.
246	* @param phDigest On input this is the digest of the content. On
247	* output it will (on success) be a reference to
248	* the message digest of the authenticated
249	* attributes. The input reference is consumed.
250	* The caller shall release the output reference.
251	* @param fFlags Flags.
252	* @param pErrInfo Extended error info, optional.
253	*/
254	static int rtCrPkcs7VerifySignerInfoAuthAttribs(PCRTCRPKCS7SIGNERINFO pSignerInfo, PCRTCRPKCS7SIGNEDDATA pSignedData,
255	PRTCRDIGEST phDigest, uint32_t fFlags, PRTERRINFO pErrInfo)
256	{
257	/*
258	* Scan the attributes and validate the two required attributes
259	* (RFC-2315, chapter 9.2, fourth bullet). Checking that we've got exactly
260	* one of each of them is checked by the santiy checker function, so we'll
261	* just assert that it did it's job here.
262	*/
263	uint32_t cContentTypes = 0;
264	uint32_t cMessageDigests = 0;
265	uint32_t i = pSignerInfo->AuthenticatedAttributes.cItems;
266	while (i-- > 0)
267	{
268	PCRTCRPKCS7ATTRIBUTE pAttrib = pSignerInfo->AuthenticatedAttributes.papItems[i];
269
270	if (RTAsn1ObjId_CompareWithString(&pAttrib->Type, RTCR_PKCS9_ID_CONTENT_TYPE_OID) == 0)
271	{
272	AssertReturn(!cContentTypes, VERR_CR_PKCS7_INTERNAL_ERROR);
273	AssertReturn(pAttrib->enmType == RTCRPKCS7ATTRIBUTETYPE_OBJ_IDS, VERR_CR_PKCS7_INTERNAL_ERROR);
274	AssertReturn(pAttrib->uValues.pObjIds->cItems == 1, VERR_CR_PKCS7_INTERNAL_ERROR);
275
276	if ( !(fFlags & RTCRPKCS7VERIFY_SD_F_COUNTER_SIGNATURE) /* See note about microsoft below. */
277	&& RTAsn1ObjId_Compare(pAttrib->uValues.pObjIds->papItems[0], &pSignedData->ContentInfo.ContentType) != 0)
278	return RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_CONTENT_TYPE_ATTRIB_MISMATCH,
279	"Expected content-type %s, found %s", pAttrib->uValues.pObjIds->papItems[0]->szObjId,
280	pSignedData->ContentInfo.ContentType.szObjId);
281	cContentTypes++;
282	}
283	else if (RTAsn1ObjId_CompareWithString(&pAttrib->Type, RTCR_PKCS9_ID_MESSAGE_DIGEST_OID) == 0)
284	{
285	AssertReturn(!cMessageDigests, VERR_CR_PKCS7_INTERNAL_ERROR);
286	AssertReturn(pAttrib->enmType == RTCRPKCS7ATTRIBUTETYPE_OCTET_STRINGS, VERR_CR_PKCS7_INTERNAL_ERROR);
287	AssertReturn(pAttrib->uValues.pOctetStrings->cItems == 1, VERR_CR_PKCS7_INTERNAL_ERROR);
288
289	if (!RTCrDigestMatch(*phDigest,
290	pAttrib->uValues.pOctetStrings->papItems[0]->Asn1Core.uData.pv,
291	pAttrib->uValues.pOctetStrings->papItems[0]->Asn1Core.cb))
292	{
293	size_t cbHash = RTCrDigestGetHashSize(*phDigest);
294	if (cbHash != pAttrib->uValues.pOctetStrings->papItems[0]->Asn1Core.cb)
295	return RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_MESSAGE_DIGEST_ATTRIB_MISMATCH,
296	"Authenticated message-digest attribute mismatch: cbHash=%#zx cbValue=%#x",
297	cbHash, pAttrib->uValues.pOctetStrings->papItems[0]->Asn1Core.cb);
298	return RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_MESSAGE_DIGEST_ATTRIB_MISMATCH,
299	"Authenticated message-digest attribute mismatch (cbHash=%#zx):\n"
300	"signed: %.*Rhxs\n"
301	"our: %.*Rhxs\n",
302	cbHash,
303	cbHash, pAttrib->uValues.pOctetStrings->papItems[0]->Asn1Core.uData.pv,
304	cbHash, RTCrDigestGetHash(*phDigest));
305	}
306	cMessageDigests++;
307	}
308	}
309
310	/*
311	* Full error reporting here as we don't currently extensively santiy check
312	* counter signatures.
313	* Note! Microsoft includes content info in their timestamp counter signatures,
314	* at least for vista, despite the RFC-3852 stating counter signatures
315	* "MUST NOT contain a content-type".
316	*/
317	if (RT_UNLIKELY( cContentTypes != 1
318	&& !(fFlags & RTCRPKCS7VERIFY_SD_F_COUNTER_SIGNATURE)))
319	return RTErrInfoSet(pErrInfo, VERR_CR_PKCS7_MISSING_CONTENT_TYPE_ATTRIB,
320	"Missing authenticated content-type attribute.");
321	if (RT_UNLIKELY(cMessageDigests != 1))
322	return RTErrInfoSet(pErrInfo, VERR_CR_PKCS7_MISSING_MESSAGE_DIGEST_ATTRIB,
323	"Missing authenticated message-digest attribute.");
324
325	/*
326	* Calculate the digest of the authenticated attributes for use in the
327	* signature validation.
328	*/
329	if ( pSignerInfo->DigestAlgorithm.Parameters.enmType != RTASN1TYPE_NULL
330	&& pSignerInfo->DigestAlgorithm.Parameters.enmType != RTASN1TYPE_NOT_PRESENT)
331	return RTErrInfoSet(pErrInfo, VERR_CR_PKCS7_DIGEST_PARAMS_NOT_IMPL, "Digest algorithm has unsupported parameters");
332
333	RTCRDIGEST hDigest;
334	int rc = RTCrDigestCreateByObjId(&hDigest, &pSignerInfo->DigestAlgorithm.Algorithm);
335	if (RT_SUCCESS(rc))
336	{
337	RTCrDigestRelease(*phDigest);
338	*phDigest = hDigest;
339
340	/** @todo The encoding step modifies the data, contradicting the const-ness
341	* of the parameter. */
342	rc = RTCrPkcs7Attributes_HashAttributes((PRTCRPKCS7ATTRIBUTES)&pSignerInfo->AuthenticatedAttributes, hDigest, pErrInfo);
343	}
344	return rc;
345	}
346
347
348	/**
349	* Find the handle to the digest given by the specified SignerInfo.
350	*
351	* @returns IPRT status code
352	* @param phDigest Where to return a referenced digest handle on
353	* success.
354	* @param pSignedData The signed data structure.
355	* @param pSignerInfo The signer info.
356	* @param pahDigests Array of content digests that runs parallel to
357	* pSignedData->DigestAlgorithms.
358	* @param pErrInfo Where to store additional error details,
359	* optional.
360	*/
361	static int rtCrPkcs7VerifyFindDigest(PRTCRDIGEST phDigest, PCRTCRPKCS7SIGNEDDATA pSignedData,
362	PCRTCRPKCS7SIGNERINFO pSignerInfo, PRTCRDIGEST pahDigests, PRTERRINFO pErrInfo)
363	{
364	uint32_t iDigest = pSignedData->DigestAlgorithms.cItems;
365	while (iDigest-- > 0)
366	if (RTCrX509AlgorithmIdentifier_Compare(pSignedData->DigestAlgorithms.papItems[iDigest],
367	&pSignerInfo->DigestAlgorithm) == 0)
368	{
369	RTCRDIGEST hDigest = pahDigests[iDigest];
370	uint32_t cRefs = RTCrDigestRetain(hDigest);
371	AssertReturn(cRefs != UINT32_MAX, VERR_CR_PKCS7_INTERNAL_ERROR);
372	*phDigest = hDigest;
373	return VINF_SUCCESS;
374	}
375	phDigest = NIL_RTCRDIGEST; / Make gcc happy. */
376	return RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_DIGEST_ALGO_NOT_FOUND_IN_LIST,
377	"SignerInfo.DigestAlgorithm %s not found.",
378	pSignerInfo->DigestAlgorithm.Algorithm.szObjId);
379	}
380
381
382	/**
383	* Verifies one signature on a PKCS \#7 SignedData.
384	*
385	* @returns IPRT status code.
386	* @param pSignerInfo The signature.
387	* @param pSignedData The SignedData.
388	* @param hDigests The digest corresponding to
389	* pSignerInfo->DigestAlgorithm.
390	* @param fFlags Verification flags.
391	* @param hAdditionalCerts Store containing optional certificates,
392	* optional.
393	* @param hTrustedCerts Store containing trusted certificates, required.
394	* @param pValidationTime The time we're supposed to validate the
395	* certificates chains at.
396	* @param pfnVerifyCert Signing certificate verification callback.
397	* @param fVccFlags Signing certificate verification callback flags.
398	* @param pvUser Callback parameter.
399	* @param pErrInfo Where to store additional error details,
400	* optional.
401	*/
402	static int rtCrPkcs7VerifySignerInfo(PCRTCRPKCS7SIGNERINFO pSignerInfo, PCRTCRPKCS7SIGNEDDATA pSignedData,
403	RTCRDIGEST hDigest, uint32_t fFlags, RTCRSTORE hAdditionalCerts, RTCRSTORE hTrustedCerts,
404	PCRTTIMESPEC pValidationTime, PFNRTCRPKCS7VERIFYCERTCALLBACK pfnVerifyCert,
405	uint32_t fVccFlags, void *pvUser, PRTERRINFO pErrInfo)
406	{
407	/*
408	* Locate the certificate used for signing.
409	*/
410	PCRTCRCERTCTX pSignerCertCtx = NULL;
411	PCRTCRX509CERTIFICATE pSignerCert = NULL;
412	if (hTrustedCerts != NIL_RTCRSTORE)
413	pSignerCertCtx = RTCrStoreCertByIssuerAndSerialNo(hTrustedCerts, &pSignerInfo->IssuerAndSerialNumber.Name,
414	&pSignerInfo->IssuerAndSerialNumber.SerialNumber);
415	if (!pSignerCertCtx && hAdditionalCerts != NIL_RTCRSTORE)
416	pSignerCertCtx = RTCrStoreCertByIssuerAndSerialNo(hAdditionalCerts, &pSignerInfo->IssuerAndSerialNumber.Name,
417	&pSignerInfo->IssuerAndSerialNumber.SerialNumber);
418	if (pSignerCertCtx)
419	pSignerCert = pSignerCertCtx->pCert;
420	else
421	{
422	pSignerCert = RTCrPkcs7SetOfCerts_FindX509ByIssuerAndSerialNumber(&pSignedData->Certificates,
423	&pSignerInfo->IssuerAndSerialNumber.Name,
424	&pSignerInfo->IssuerAndSerialNumber.SerialNumber);
425	if (!pSignerCert)
426	return RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_SIGNED_DATA_CERT_NOT_FOUND,
427	"Certificate not found: serial=%.*Rhxs",
428	pSignerInfo->IssuerAndSerialNumber.SerialNumber.Asn1Core.cb,
429	pSignerInfo->IssuerAndSerialNumber.SerialNumber.Asn1Core.uData.pv);
430	}
431
432	/*
433	* Unless caller requesed all certificates to be trusted fully, we always
434	* pass it on to the certificate path builder so it can do the requested
435	* checks on trust anchors. (We didn't used to do this as the path
436	* builder could handle trusted targets. A benefit here is that
437	* pfnVerifyCert can assume a hCertPaths now, and get the validation time
438	* from it if it wants it.)
439	*
440	* If no valid paths are found, this step will fail.
441	*/
442	int rc;
443	if (!(fFlags & RTCRPKCS7VERIFY_SD_F_TRUST_ALL_CERTS))
444	{
445	RTCRX509CERTPATHS hCertPaths;
446	rc = RTCrX509CertPathsCreate(&hCertPaths, pSignerCert);
447	if (RT_SUCCESS(rc))
448	{
449	rc = RTCrX509CertPathsSetValidTimeSpec(hCertPaths, pValidationTime);
450	if (hTrustedCerts != NIL_RTCRSTORE && RT_SUCCESS(rc))
451	rc = RTCrX509CertPathsSetTrustedStore(hCertPaths, hTrustedCerts);
452	if (hAdditionalCerts != NIL_RTCRSTORE && RT_SUCCESS(rc))
453	rc = RTCrX509CertPathsSetUntrustedStore(hCertPaths, hAdditionalCerts);
454	if (pSignedData->Certificates.cItems > 0 && RT_SUCCESS(rc))
455	rc = RTCrX509CertPathsSetUntrustedSet(hCertPaths, &pSignedData->Certificates);
456	if ((fFlags & RTCRPKCS7VERIFY_SD_F_CHECK_TRUST_ANCHORS) && RT_SUCCESS(rc))
457	rc = RTCrX509CertPathsSetTrustAnchorChecks(hCertPaths, true /fEnable/);
458	if (RT_SUCCESS(rc))
459	{
460	rc = RTCrX509CertPathsBuild(hCertPaths, pErrInfo);
461	if (RT_SUCCESS(rc))
462	rc = RTCrX509CertPathsValidateAll(hCertPaths, NULL, pErrInfo);
463
464	/*
465	* Check that the certificate purpose and whatnot matches what
466	* is being signed.
467	*/
468	if (RT_SUCCESS(rc))
469	rc = pfnVerifyCert(pSignerCert, hCertPaths, fVccFlags, pvUser, pErrInfo);
470	}
471	else
472	RTErrInfoSetF(pErrInfo, rc, "Error configuring path builder: %Rrc", rc);
473	RTCrX509CertPathsRelease(hCertPaths);
474	}
475	}
476	/*
477	* Check that the certificate purpose matches what is signed.
478	*/
479	else
480	rc = pfnVerifyCert(pSignerCert, NIL_RTCRX509CERTPATHS, fVccFlags, pvUser, pErrInfo);
481
482	/*
483	* Reference the digest so we can safely replace with one on the
484	* authenticated attributes below.
485	*/
486	if ( RT_SUCCESS(rc)
487	&& RTCrDigestRetain(hDigest) != UINT32_MAX)
488	{
489	/*
490	* If there are authenticated attributes, we've got more work before we
491	* can verify the signature.
492	*/
493	if ( RT_SUCCESS(rc)
494	&& RTCrPkcs7Attributes_IsPresent(&pSignerInfo->AuthenticatedAttributes))
495	rc = rtCrPkcs7VerifySignerInfoAuthAttribs(pSignerInfo, pSignedData, &hDigest, fFlags, pErrInfo);
496
497	/*
498	* Verify the signature.
499	*/
500	if (RT_SUCCESS(rc))
501	{
502	RTCRKEY hKey;
503	rc = RTCrKeyCreateFromSubjectPublicKeyInfo(&hKey, &pSignerCert->TbsCertificate.SubjectPublicKeyInfo,
504	pErrInfo, "pkcs7");
505	if (RT_SUCCESS(rc))
506	{
507	RTCRPKIXSIGNATURE hSignature;
508	rc = RTCrPkixSignatureCreateByObjId(&hSignature, &pSignerInfo->DigestEncryptionAlgorithm.Algorithm,
509	hKey, &pSignerInfo->DigestEncryptionAlgorithm.Parameters, false /fSigning/);
510	RTCrKeyRelease(hKey);
511	if (RT_SUCCESS(rc))
512	{
513	/** @todo Check that DigestEncryptionAlgorithm is compatible with hSignature
514	* (this is not vital). */
515	rc = RTCrPkixSignatureVerifyOctetString(hSignature, hDigest, &pSignerInfo->EncryptedDigest);
516	if (RT_FAILURE(rc))
517	rc = RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_SIGNATURE_VERIFICATION_FAILED,
518	"Signature verification failed: %Rrc", rc);
519	RTCrPkixSignatureRelease(hSignature);
520	}
521	else
522	rc = RTErrInfoSetF(pErrInfo, rc, "Failure to instantiate public key algorithm [IPRT]: %s (%s)",
523	pSignerCert->TbsCertificate.SubjectPublicKeyInfo.Algorithm.Algorithm.szObjId,
524	pSignerInfo->DigestEncryptionAlgorithm.Algorithm.szObjId);
525	}
526	}
527
528	RTCrDigestRelease(hDigest);
529	}
530	else if (RT_SUCCESS(rc))
531	rc = VERR_CR_PKCS7_INTERNAL_ERROR;
532	RTCrCertCtxRelease(pSignerCertCtx);
533	return rc;
534	}
535
536
537	/**
538	* Verifies a counter signature.
539	*
540	* @returns IPRT status code.
541	* @param pCounterSignerInfo The counter signature.
542	* @param pPrimarySignerInfo The primary signature (can be a counter
543	* signature too if nested).
544	* @param pSignedData The SignedData.
545	* @param fFlags Verification flags.
546	* @param hAdditionalCerts Store containing optional certificates,
547	* optional.
548	* @param hTrustedCerts Store containing trusted certificates, required.
549	* @param pValidationTime The time we're supposed to validate the
550	* certificates chains at.
551	* @param pfnVerifyCert Signing certificate verification callback.
552	* @param fVccFlags Signing certificate verification callback flags.
553	* @param pvUser Callback parameter.
554	* @param pErrInfo Where to store additional error details,
555	* optional.
556	*/
557	static int rtCrPkcs7VerifyCounterSignerInfo(PCRTCRPKCS7SIGNERINFO pCounterSignerInfo, PCRTCRPKCS7SIGNERINFO pPrimarySignerInfo,
558	PCRTCRPKCS7SIGNEDDATA pSignedData, uint32_t fFlags,
559	RTCRSTORE hAdditionalCerts, RTCRSTORE hTrustedCerts, PCRTTIMESPEC pValidationTime,
560	PFNRTCRPKCS7VERIFYCERTCALLBACK pfnVerifyCert, uint32_t fVccFlags,
561	void *pvUser, PRTERRINFO pErrInfo)
562	{
563	/*
564	* Calculate the digest we need to verify.
565	*/
566	RTCRDIGEST hDigest;
567	int rc = RTCrDigestCreateByObjId(&hDigest, &pCounterSignerInfo->DigestAlgorithm.Algorithm);
568	if (RT_SUCCESS(rc))
569	{
570	rc = RTCrDigestUpdate(hDigest,
571	pPrimarySignerInfo->EncryptedDigest.Asn1Core.uData.pv,
572	pPrimarySignerInfo->EncryptedDigest.Asn1Core.cb);
573	if (RT_SUCCESS(rc))
574	rc = RTCrDigestFinal(hDigest, NULL, 0);
575	if (RT_SUCCESS(rc))
576	{
577	/*
578	* Pass it on to the common SignerInfo verifier function.
579	*/
580	rc = rtCrPkcs7VerifySignerInfo(pCounterSignerInfo, pSignedData, hDigest,
581	fFlags \| RTCRPKCS7VERIFY_SD_F_COUNTER_SIGNATURE,
582	hAdditionalCerts, hTrustedCerts, pValidationTime,
583	pfnVerifyCert, fVccFlags, pvUser, pErrInfo);
584
585	}
586	else
587	rc = RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_DIGEST_CALC_ERROR,
588	"Hashing for counter signature failed unexpectedly: %Rrc", rc);
589	RTCrDigestRelease(hDigest);
590	}
591	else
592	rc = RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_DIGEST_CREATE_ERROR, "Error creating digest for '%s': %Rrc",
593	pCounterSignerInfo->DigestAlgorithm.Algorithm.szObjId, rc);
594
595	return rc;
596	}
597
598
599	/**
600	* Worker.
601	*/
602	static int rtCrPkcs7VerifySignedDataEx(PCRTCRPKCS7CONTENTINFO pContentInfo, uint32_t fFlags,
603	RTCRSTORE hAdditionalCerts, RTCRSTORE hTrustedCerts,
604	PCRTTIMESPEC pValidationTime,
605	PFNRTCRPKCS7VERIFYCERTCALLBACK pfnVerifyCert, void *pvUser,
606	void const *pvContent, size_t cbContent, PRTERRINFO pErrInfo)
607	{
608	/*
609	* Check and adjust the input.
610	*/
611	if (pfnVerifyCert)
612	AssertPtrReturn(pfnVerifyCert, VERR_INVALID_POINTER);
613	else
614	pfnVerifyCert = RTCrPkcs7VerifyCertCallbackDefault;
615
616	if (!RTCrPkcs7ContentInfo_IsSignedData(pContentInfo))
617	return RTErrInfoSet(pErrInfo, VERR_CR_PKCS7_NOT_SIGNED_DATA, "Not PKCS #7 SignedData.");
618	PCRTCRPKCS7SIGNEDDATA pSignedData = pContentInfo->u.pSignedData;
619	int rc = RTCrPkcs7SignedData_CheckSanity(pSignedData, 0, pErrInfo, "");
620	if (RT_FAILURE(rc))
621	return rc;
622
623	/*
624	* Hash the content info.
625	*/
626	/* Check that there aren't too many or too few hash algorithms for our
627	implementation and purposes. */
628	RTCRDIGEST ahDigests[2];
629	uint32_t const cDigests = pSignedData->DigestAlgorithms.cItems;
630	if (!cDigests) /** @todo we might have to support this... */
631	return RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_NO_DIGEST_ALGORITHMS, "No digest algorithms");
632
633	if (cDigests > RT_ELEMENTS(ahDigests))
634	return RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_TOO_MANY_DIGEST_ALGORITHMS,
635	"Too many digest algorithm: cAlgorithms=%u", cDigests);
636
637	/* Create the message digest calculators. */
638	rc = VERR_CR_PKCS7_NO_DIGEST_ALGORITHMS;
639	uint32_t i;
640	for (i = 0; i < cDigests; i++)
641	{
642	rc = RTCrDigestCreateByObjId(&ahDigests[i], &pSignedData->DigestAlgorithms.papItems[i]->Algorithm);
643	if (RT_FAILURE(rc))
644	{
645	rc = RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_DIGEST_CREATE_ERROR, "Error creating digest for '%s': %Rrc",
646	pSignedData->DigestAlgorithms.papItems[i]->Algorithm.szObjId, rc);
647	break;
648	}
649	}
650	if (RT_SUCCESS(rc))
651	{
652	/* Hash the content. */
653	for (i = 0; i < cDigests && RT_SUCCESS(rc); i++)
654	{
655	rc = RTCrDigestUpdate(ahDigests[i], pvContent, cbContent);
656	if (RT_SUCCESS(rc))
657	rc = RTCrDigestFinal(ahDigests[i], NULL, 0);
658	}
659	if (RT_SUCCESS(rc))
660	{
661	/*
662	* Validate the signed infos. The flags may select one particular entry.
663	*/
664	RTTIMESPEC const GivenValidationTime = *pValidationTime;
665	uint32_t fPrimaryVccFlags = !(fFlags & RTCRPKCS7VERIFY_SD_F_USAGE_TIMESTAMPING)
666	? RTCRPKCS7VCC_F_SIGNED_DATA : RTCRPKCS7VCC_F_TIMESTAMP;
667	uint32_t cItems = pSignedData->SignerInfos.cItems;
668	i = 0;
669	if (fFlags & RTCRPKCS7VERIFY_SD_F_HAS_SIGNER_INDEX)
670	{
671	i = (fFlags & RTCRPKCS7VERIFY_SD_F_SIGNER_INDEX_MASK) >> RTCRPKCS7VERIFY_SD_F_SIGNER_INDEX_SHIFT;
672	cItems = RT_MIN(cItems, i + 1);
673	}
674	rc = VERR_CR_PKCS7_NO_SIGNER_INFOS;
675	for (; i < cItems; i++)
676	{
677	PCRTCRPKCS7SIGNERINFO pSignerInfo = pSignedData->SignerInfos.papItems[i];
678	RTCRDIGEST hThisDigest = NIL_RTCRDIGEST; /* (gcc maybe incredible stupid.) */
679	rc = rtCrPkcs7VerifyFindDigest(&hThisDigest, pSignedData, pSignerInfo, ahDigests, pErrInfo);
680	if (RT_FAILURE(rc))
681	break;
682
683	/*
684	* See if we can find a trusted signing time.
685	* (Note that while it would make sense splitting up this function,
686	* we need to carry a lot of arguments around, so better not.)
687	*/
688	bool fDone = false;
689	PCRTCRPKCS7SIGNERINFO pSigningTimeSigner = NULL;
690	PCRTASN1TIME pSignedTime;
691	while ( !fDone
692	&& (pSignedTime = RTCrPkcs7SignerInfo_GetSigningTime(pSignerInfo, &pSigningTimeSigner)) != NULL)
693	{
694	RTTIMESPEC ThisValidationTime;
695	if (RT_LIKELY(RTTimeImplode(&ThisValidationTime, &pSignedTime->Time)))
696	{
697	if (pSigningTimeSigner == pSignerInfo)
698	{
699	if (fFlags & RTCRPKCS7VERIFY_SD_F_COUNTER_SIGNATURE_SIGNING_TIME_ONLY)
700	continue;
701	rc = rtCrPkcs7VerifySignerInfo(pSignerInfo, pSignedData, hThisDigest, fFlags,
702	hAdditionalCerts, hTrustedCerts, &ThisValidationTime,
703	pfnVerifyCert, fPrimaryVccFlags \| RTCRPKCS7VCC_F_TIMESTAMP,
704	pvUser, pErrInfo);
705	}
706	else
707	{
708	rc = VINF_SUCCESS;
709	if (!(fFlags & RTCRPKCS7VERIFY_SD_F_USE_SIGNING_TIME_UNVERIFIED))
710	rc = rtCrPkcs7VerifyCounterSignerInfo(pSigningTimeSigner, pSignerInfo, pSignedData,
711	fFlags & ~RTCRPKCS7VERIFY_SD_F_UPDATE_VALIDATION_TIME,
712	hAdditionalCerts, hTrustedCerts, &ThisValidationTime,
713	pfnVerifyCert, RTCRPKCS7VCC_F_TIMESTAMP, pvUser, pErrInfo);
714	if (RT_SUCCESS(rc))
715	rc = rtCrPkcs7VerifySignerInfo(pSignerInfo, pSignedData, hThisDigest, fFlags, hAdditionalCerts,
716	hTrustedCerts, &ThisValidationTime,
717	pfnVerifyCert, fPrimaryVccFlags, pvUser, pErrInfo);
718	}
719	fDone = RT_SUCCESS(rc)
720	\|\| (fFlags & RTCRPKCS7VERIFY_SD_F_ALWAYS_USE_SIGNING_TIME_IF_PRESENT);
721	if ((fFlags & RTCRPKCS7VERIFY_SD_F_UPDATE_VALIDATION_TIME) && fDone)
722	*(PRTTIMESPEC)pValidationTime = ThisValidationTime;
723	}
724	else
725	{
726	rc = RTErrInfoSet(pErrInfo, VERR_INTERNAL_ERROR_3, "RTTimeImplode failed");
727	fDone = true;
728	}
729	}
730
731	/*
732	* If not luck, check for microsoft timestamp counter signatures.
733	*/
734	if (!fDone && !(fFlags & RTCRPKCS7VERIFY_SD_F_IGNORE_MS_TIMESTAMP))
735	{
736	PCRTCRPKCS7CONTENTINFO pSignedTimestamp = NULL;
737	pSignedTime = RTCrPkcs7SignerInfo_GetMsTimestamp(pSignerInfo, &pSignedTimestamp);
738	if (pSignedTime)
739	{
740	RTTIMESPEC ThisValidationTime;
741	if (RT_LIKELY(RTTimeImplode(&ThisValidationTime, &pSignedTime->Time)))
742	{
743	rc = VINF_SUCCESS;
744	if (!(fFlags & RTCRPKCS7VERIFY_SD_F_USE_MS_TIMESTAMP_UNVERIFIED))
745	rc = RTCrPkcs7VerifySignedData(pSignedTimestamp,
746	fFlags \| RTCRPKCS7VERIFY_SD_F_IGNORE_MS_TIMESTAMP
747	\| RTCRPKCS7VERIFY_SD_F_USAGE_TIMESTAMPING,
748	hAdditionalCerts, hTrustedCerts, &ThisValidationTime,
749	pfnVerifyCert, pvUser, pErrInfo);
750
751	if (RT_SUCCESS(rc))
752	rc = rtCrPkcs7VerifySignerInfo(pSignerInfo, pSignedData, hThisDigest, fFlags, hAdditionalCerts,
753	hTrustedCerts, &ThisValidationTime,
754	pfnVerifyCert, fPrimaryVccFlags, pvUser, pErrInfo);
755	fDone = RT_SUCCESS(rc)
756	\|\| (fFlags & RTCRPKCS7VERIFY_SD_F_ALWAYS_USE_MS_TIMESTAMP_IF_PRESENT);
757	if ((fFlags & RTCRPKCS7VERIFY_SD_F_UPDATE_VALIDATION_TIME) && fDone)
758	*(PRTTIMESPEC)pValidationTime = ThisValidationTime;
759	}
760	else
761	{
762	rc = RTErrInfoSet(pErrInfo, VERR_INTERNAL_ERROR_3, "RTTimeImplode failed");
763	fDone = true;
764	}
765
766	}
767	}
768
769	/*
770	* No valid signing time found, use the one specified instead.
771	*/
772	if (!fDone)
773	rc = rtCrPkcs7VerifySignerInfo(pSignerInfo, pSignedData, hThisDigest, fFlags, hAdditionalCerts, hTrustedCerts,
774	&GivenValidationTime, pfnVerifyCert, fPrimaryVccFlags, pvUser, pErrInfo);
775	RTCrDigestRelease(hThisDigest);
776	if (RT_FAILURE(rc))
777	break;
778	}
779	}
780	else
781	rc = RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_DIGEST_CALC_ERROR,
782	"Hashing content failed unexpectedly (i=%u): %Rrc", i, rc);
783
784	/* Clean up digests. */
785	i = cDigests;
786	}
787	while (i-- > 0)
788	{
789	int rc2 = RTCrDigestRelease(ahDigests[i]);
790	AssertRC(rc2);
791	}
792
793
794	#ifdef IPRT_WITH_OPENSSL
795	/*
796	* Verify using OpenSSL and combine the results (should be identical).
797	*/
798	/** @todo figure out how to verify MS timstamp signatures using OpenSSL. */
799	if (fFlags & RTCRPKCS7VERIFY_SD_F_USAGE_TIMESTAMPING)
800	return rc;
801	/** @todo figure out if we can verify just one signer info item using OpenSSL. */
802	if (!(fFlags & RTCRPKCS7VERIFY_SD_F_HAS_SIGNER_INDEX) && pSignedData->SignerInfos.cItems > 1)
803	return rc;
804
805	int rcOssl = rtCrPkcs7VerifySignedDataUsingOpenSsl(pContentInfo, fFlags, hAdditionalCerts, hTrustedCerts,
806	pvContent, cbContent, RT_SUCCESS(rc) ? pErrInfo : NULL);
807	if (RT_SUCCESS(rcOssl) && RT_SUCCESS(rc))
808	return rc;
809	// AssertMsg(RT_FAILURE_NP(rcOssl) && RT_FAILURE_NP(rc), ("%Rrc, %Rrc\n", rcOssl, rc));
810	if (RT_FAILURE(rc))
811	return rc;
812	return rcOssl;
813	#else
814	return rc;
815	#endif
816	}
817
818
819	RTDECL(int) RTCrPkcs7VerifySignedData(PCRTCRPKCS7CONTENTINFO pContentInfo, uint32_t fFlags,
820	RTCRSTORE hAdditionalCerts, RTCRSTORE hTrustedCerts,
821	PCRTTIMESPEC pValidationTime, PFNRTCRPKCS7VERIFYCERTCALLBACK pfnVerifyCert, void *pvUser,
822	PRTERRINFO pErrInfo)
823	{
824	/*
825	* Find the content and pass it on to common worker.
826	*/
827	if (!RTCrPkcs7ContentInfo_IsSignedData(pContentInfo))
828	return RTErrInfoSet(pErrInfo, VERR_CR_PKCS7_NOT_SIGNED_DATA, "Not PKCS #7 SignedData.");
829
830	/* Exactly what the content is, is for some stupid reason unnecessarily complicated. */
831	PCRTCRPKCS7SIGNEDDATA pSignedData = pContentInfo->u.pSignedData;
832	void const *pvContent = pSignedData->ContentInfo.Content.Asn1Core.uData.pv;
833	uint32_t cbContent = pSignedData->ContentInfo.Content.Asn1Core.cb;
834	if (pSignedData->ContentInfo.Content.pEncapsulated)
835	{
836	pvContent = pSignedData->ContentInfo.Content.pEncapsulated->uData.pv;
837	cbContent = pSignedData->ContentInfo.Content.pEncapsulated->cb;
838	}
839
840	return rtCrPkcs7VerifySignedDataEx(pContentInfo, fFlags, hAdditionalCerts, hTrustedCerts, pValidationTime,
841	pfnVerifyCert, pvUser, pvContent, cbContent, pErrInfo);
842	}
843
844
845	RTDECL(int) RTCrPkcs7VerifySignedDataWithExternalData(PCRTCRPKCS7CONTENTINFO pContentInfo, uint32_t fFlags,
846	RTCRSTORE hAdditionalCerts, RTCRSTORE hTrustedCerts,
847	PCRTTIMESPEC pValidationTime,
848	PFNRTCRPKCS7VERIFYCERTCALLBACK pfnVerifyCert, void *pvUser,
849	void const *pvData, size_t cbData, PRTERRINFO pErrInfo)
850	{
851	/*
852	* Require 'data' as inner content type.
853	*/
854	if (!RTCrPkcs7ContentInfo_IsSignedData(pContentInfo))
855	return RTErrInfoSet(pErrInfo, VERR_CR_PKCS7_NOT_SIGNED_DATA, "Not PKCS #7 SignedData.");
856	PCRTCRPKCS7SIGNEDDATA pSignedData = pContentInfo->u.pSignedData;
857
858	if (RTAsn1ObjId_CompareWithString(&pSignedData->ContentInfo.ContentType, RTCR_PKCS7_DATA_OID) != 0)
859	return RTErrInfoSetF(pErrInfo, VERR_CR_PKCS7_NOT_DATA,
860	"The signedData content type is %s, expected 'data' (%s)",
861	pSignedData->ContentInfo.ContentType.szObjId, RTCR_PKCS7_DATA_OID);
862
863	return rtCrPkcs7VerifySignedDataEx(pContentInfo, fFlags, hAdditionalCerts, hTrustedCerts, pValidationTime,
864	pfnVerifyCert, pvUser, pvData, cbData, pErrInfo);
865	}
866

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source: vbox/trunk/src/VBox/Runtime/common/crypto/pkcs7-verify.cpp@ 98103

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