diff options
Diffstat (limited to 'CryptoPkg/Library/BaseCryptLib/Pk/CryptTs.c')
| -rw-r--r-- | CryptoPkg/Library/BaseCryptLib/Pk/CryptTs.c | 724 |
1 files changed, 724 insertions, 0 deletions
diff --git a/CryptoPkg/Library/BaseCryptLib/Pk/CryptTs.c b/CryptoPkg/Library/BaseCryptLib/Pk/CryptTs.c new file mode 100644 index 0000000000..6cb12cc26c --- /dev/null +++ b/CryptoPkg/Library/BaseCryptLib/Pk/CryptTs.c @@ -0,0 +1,724 @@ +/** @file
+ RFC3161 Timestamp Countersignature Verification over OpenSSL.
+ The timestamp is generated by a TimeStamping Authority (TSA) and asserts that a
+ publisher's signature existed before the specified time. The timestamp extends
+ the lifetime of the signature when a signing certificate expires or is later
+ revoked.
+
+Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution. The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "InternalCryptLib.h"
+
+#include <openssl/asn1.h>
+#include <openssl/asn1t.h>
+#include <openssl/x509.h>
+#include <openssl/x509v3.h>
+#include <openssl/pkcs7.h>
+
+//
+// OID ASN.1 Value for SPC_RFC3161_OBJID ("1.3.6.1.4.1.311.3.3.1")
+//
+UINT8 mSpcRFC3161OidValue[] = {
+ 0x2b, 0x06, 0x01, 0x04, 0x01, 0x82, 0x37, 0x03, 0x03, 0x01
+ };
+
+///
+/// The messageImprint field SHOULD contain the hash of the datum to be
+/// time-stamped. The hash is represented as an OCTET STRING. Its
+/// length MUST match the length of the hash value for that algorithm
+/// (e.g., 20 bytes for SHA-1 or 16 bytes for MD5).
+///
+/// MessageImprint ::= SEQUENCE {
+/// hashAlgorithm AlgorithmIdentifier,
+/// hashedMessage OCTET STRING }
+///
+typedef struct {
+ X509_ALGOR *HashAlgorithm;
+ ASN1_OCTET_STRING *HashedMessage;
+} TS_MESSAGE_IMPRINT;
+
+//
+// ASN.1 Functions for TS_MESSAGE_IMPRINT
+//
+DECLARE_ASN1_FUNCTIONS (TS_MESSAGE_IMPRINT)
+ASN1_SEQUENCE (TS_MESSAGE_IMPRINT) = {
+ ASN1_SIMPLE (TS_MESSAGE_IMPRINT, HashAlgorithm, X509_ALGOR),
+ ASN1_SIMPLE (TS_MESSAGE_IMPRINT, HashedMessage, ASN1_OCTET_STRING)
+} ASN1_SEQUENCE_END (TS_MESSAGE_IMPRINT)
+IMPLEMENT_ASN1_FUNCTIONS (TS_MESSAGE_IMPRINT)
+
+///
+/// Accuracy represents the time deviation around the UTC time contained
+/// in GeneralizedTime of time-stamp token.
+///
+/// Accuracy ::= SEQUENCE {
+/// seconds INTEGER OPTIONAL,
+/// millis [0] INTEGER (1..999) OPTIONAL,
+/// micros [1] INTEGER (1..999) OPTIONAL }
+///
+typedef struct {
+ ASN1_INTEGER *Seconds;
+ ASN1_INTEGER *Millis;
+ ASN1_INTEGER *Micros;
+} TS_ACCURACY;
+
+//
+// ASN.1 Functions for TS_ACCURACY
+//
+DECLARE_ASN1_FUNCTIONS (TS_ACCURACY)
+ASN1_SEQUENCE (TS_ACCURACY) = {
+ ASN1_OPT (TS_ACCURACY, Seconds, ASN1_INTEGER),
+ ASN1_IMP_OPT (TS_ACCURACY, Millis, ASN1_INTEGER, 0),
+ ASN1_IMP_OPT (TS_ACCURACY, Micros, ASN1_INTEGER, 1)
+} ASN1_SEQUENCE_END (TS_ACCURACY)
+IMPLEMENT_ASN1_FUNCTIONS (TS_ACCURACY)
+
+///
+/// The timestamp token info resulting from a successful timestamp request,
+/// as defined in RFC 3161.
+///
+/// TSTInfo ::= SEQUENCE {
+/// version INTEGER { v1(1) },
+/// policy TSAPolicyId,
+/// messageImprint MessageImprint,
+/// -- MUST have the same value as the similar field in
+/// -- TimeStampReq
+/// serialNumber INTEGER,
+/// -- Time-Stamping users MUST be ready to accommodate integers
+/// -- up to 160 bits.
+/// genTime GeneralizedTime,
+/// accuracy Accuracy OPTIONAL,
+/// ordering BOOLEAN DEFAULT FALSE,
+/// nonce INTEGER OPTIONAL,
+/// -- MUST be present if the similar field was present
+/// -- in TimeStampReq. In that case it MUST have the same value.
+/// tsa [0] GeneralName OPTIONAL,
+/// extensions [1] IMPLICIT Extensions OPTIONAL }
+///
+typedef struct {
+ ASN1_INTEGER *Version;
+ ASN1_OBJECT *Policy;
+ TS_MESSAGE_IMPRINT *MessageImprint;
+ ASN1_INTEGER *SerialNumber;
+ ASN1_GENERALIZEDTIME *GenTime;
+ TS_ACCURACY *Accuracy;
+ ASN1_BOOLEAN Ordering;
+ ASN1_INTEGER *Nonce;
+ GENERAL_NAME *Tsa;
+ STACK_OF(X509_EXTENSION) *Extensions;
+} TS_TST_INFO;
+
+//
+// ASN.1 Functions for TS_TST_INFO
+//
+DECLARE_ASN1_FUNCTIONS (TS_TST_INFO)
+ASN1_SEQUENCE (TS_TST_INFO) = {
+ ASN1_SIMPLE (TS_TST_INFO, Version, ASN1_INTEGER),
+ ASN1_SIMPLE (TS_TST_INFO, Policy, ASN1_OBJECT),
+ ASN1_SIMPLE (TS_TST_INFO, MessageImprint, TS_MESSAGE_IMPRINT),
+ ASN1_SIMPLE (TS_TST_INFO, SerialNumber, ASN1_INTEGER),
+ ASN1_SIMPLE (TS_TST_INFO, GenTime, ASN1_GENERALIZEDTIME),
+ ASN1_OPT (TS_TST_INFO, Accuracy, TS_ACCURACY),
+ ASN1_OPT (TS_TST_INFO, Ordering, ASN1_FBOOLEAN),
+ ASN1_OPT (TS_TST_INFO, Nonce, ASN1_INTEGER),
+ ASN1_EXP_OPT(TS_TST_INFO, Tsa, GENERAL_NAME, 0),
+ ASN1_IMP_SEQUENCE_OF_OPT (TS_TST_INFO, Extensions, X509_EXTENSION, 1)
+} ASN1_SEQUENCE_END (TS_TST_INFO)
+IMPLEMENT_ASN1_FUNCTIONS (TS_TST_INFO)
+
+
+/**
+ Verification callback function to override any existing callbacks in OpenSSL
+ for intermediate TSA certificate supports.
+
+ @param[in] Status Original status before calling this callback.
+ @param[in] Context X509 store context.
+
+ @retval 1 Current X509 certificate is verified successfully.
+ @retval 0 Verification failed.
+
+**/
+int
+TSVerifyCallback (
+ IN int Status,
+ IN X509_STORE_CTX *Context
+ )
+{
+ X509_OBJECT *Obj;
+ INTN Error;
+ INTN Index;
+ INTN Count;
+
+ Obj = NULL;
+ Error = (INTN) X509_STORE_CTX_get_error (Context);
+
+ //
+ // X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT and X509_V_ERR_UNABLE_TO_GET_ISSUER_
+ // CERT_LOCALLY mean a X509 certificate is not self signed and its issuer
+ // can not be found in X509_verify_cert of X509_vfy.c.
+ // In order to support intermediate certificate node, we override the
+ // errors if the certification is obtained from X509 store, i.e. it is
+ // a trusted ceritifcate node that is enrolled by user.
+ // Besides,X509_V_ERR_CERT_UNTRUSTED and X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE
+ // are also ignored to enable such feature.
+ //
+ if ((Error == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT) ||
+ (Error == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY)) {
+ Obj = (X509_OBJECT *) malloc (sizeof (X509_OBJECT));
+ if (Obj == NULL) {
+ return 0;
+ }
+
+ Obj->type = X509_LU_X509;
+ Obj->data.x509 = Context->current_cert;
+
+ CRYPTO_w_lock (CRYPTO_LOCK_X509_STORE);
+
+ if (X509_OBJECT_retrieve_match (Context->ctx->objs, Obj)) {
+ Status = 1;
+ } else {
+ //
+ // If any certificate in the chain is enrolled as trusted certificate,
+ // pass the certificate verification.
+ //
+ if (Error == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY) {
+ Count = (INTN) sk_X509_num (Context->chain);
+ for (Index = 0; Index < Count; Index++) {
+ Obj->data.x509 = sk_X509_value (Context->chain, (int) Index);
+ if (X509_OBJECT_retrieve_match (Context->ctx->objs, Obj)) {
+ Status = 1;
+ break;
+ }
+ }
+ }
+ }
+
+ CRYPTO_w_unlock (CRYPTO_LOCK_X509_STORE);
+ }
+
+ if ((Error == X509_V_ERR_CERT_UNTRUSTED) ||
+ (Error == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE)) {
+ Status = 1;
+ }
+
+ if (Obj != NULL) {
+ OPENSSL_free (Obj);
+ }
+
+ return Status;
+}
+
+/**
+ Convert ASN.1 GeneralizedTime to EFI Time.
+
+ @param[in] Asn1Time Pointer to the ASN.1 GeneralizedTime to be converted.
+ @param[out] SigningTime Return the corresponding EFI Time.
+
+ @retval TRUE The time convertion succeeds.
+ @retval FALSE Invalid parameters.
+
+**/
+BOOLEAN
+EFIAPI
+ConvertAsn1TimeToEfiTime (
+ IN ASN1_TIME *Asn1Time,
+ OUT EFI_TIME *EfiTime
+ )
+{
+ CONST CHAR8 *Str;
+ UINTN Index;
+
+ if ((Asn1Time == NULL) || (EfiTime == NULL)) {
+ return FALSE;
+ }
+
+ Str = (CONST CHAR8*)Asn1Time->data;
+ SetMem (EfiTime, 0, sizeof (EFI_TIME));
+
+ Index = 0;
+ if (Asn1Time->type == V_ASN1_UTCTIME) { /* two digit year */
+ EfiTime->Year = (Str[Index++] - '0') * 10;
+ EfiTime->Year += (Str[Index++] - '0');
+ if (EfiTime->Year < 70) {
+ EfiTime->Year += 100;
+ }
+ } else if (Asn1Time->type == V_ASN1_GENERALIZEDTIME) { /* four digit year */
+ EfiTime->Year = (Str[Index++] - '0') * 1000;
+ EfiTime->Year += (Str[Index++] - '0') * 100;
+ EfiTime->Year += (Str[Index++] - '0') * 10;
+ EfiTime->Year += (Str[Index++] - '0');
+ if ((EfiTime->Year < 1900) || (EfiTime->Year > 9999)) {
+ return FALSE;
+ }
+ }
+
+ EfiTime->Month = (Str[Index++] - '0') * 10;
+ EfiTime->Month += (Str[Index++] - '0');
+ if ((EfiTime->Month < 1) || (EfiTime->Month > 12)) {
+ return FALSE;
+ }
+
+ EfiTime->Day = (Str[Index++] - '0') * 10;
+ EfiTime->Day += (Str[Index++] - '0');
+ if ((EfiTime->Day < 1) || (EfiTime->Day > 31)) {
+ return FALSE;
+ }
+
+ EfiTime->Hour = (Str[Index++] - '0') * 10;
+ EfiTime->Hour += (Str[Index++] - '0');
+ if (EfiTime->Hour > 23) {
+ return FALSE;
+ }
+
+ EfiTime->Minute = (Str[Index++] - '0') * 10;
+ EfiTime->Minute += (Str[Index++] - '0');
+ if (EfiTime->Minute > 59) {
+ return FALSE;
+ }
+
+ EfiTime->Second = (Str[Index++] - '0') * 10;
+ EfiTime->Second += (Str[Index++] - '0');
+ if (EfiTime->Second > 59) {
+ return FALSE;
+ }
+
+ /* Note: we did not adjust the time based on time zone information */
+
+ return TRUE;
+}
+
+/**
+
+ Check the validity of TimeStamp Token Information.
+
+ @param[in] TstInfo Pointer to the TS_TST_INFO structure.
+ @param[in] TimestampedData Pointer to the data to be time-stamped.
+ @param[in] DataSize Size of timestamped data in bytes.
+
+ @retval TRUE The TimeStamp Token Information is valid.
+ @retval FALSE Invalid TimeStamp Token Information.
+
+**/
+BOOLEAN
+EFIAPI
+CheckTSTInfo (
+ IN CONST TS_TST_INFO *TstInfo,
+ IN CONST UINT8 *TimestampedData,
+ IN UINTN DataSize
+ )
+{
+ BOOLEAN Status;
+ TS_MESSAGE_IMPRINT *Imprint;
+ X509_ALGOR *HashAlgo;
+ CONST EVP_MD *Md;
+ EVP_MD_CTX MdCtx;
+ UINTN MdSize;
+ UINT8 *HashedMsg;
+
+ //
+ // Initialization
+ //
+ Status = FALSE;
+ HashAlgo = NULL;
+ HashedMsg = NULL;
+
+ //
+ // -- Check version number of Timestamp:
+ // The version field (currently v1) describes the version of the time-stamp token.
+ // Conforming time-stamping servers MUST be able to provide version 1 time-stamp tokens.
+ //
+ if ((ASN1_INTEGER_get (TstInfo->Version)) != 1) {
+ return FALSE;
+ }
+
+ //
+ // -- Check Policies
+ // The policy field MUST indicate the TSA's policy under which the response was produced.
+ //
+ if (TstInfo->Policy == NULL) {
+ /// NOTE: Need to check if the requested and returned policies.
+ /// We have no information about the Requested TSA Policy.
+ return FALSE;
+ }
+
+ //
+ // -- Compute & Check Message Imprint
+ //
+ Imprint = TstInfo->MessageImprint;
+ HashAlgo = X509_ALGOR_dup (Imprint->HashAlgorithm);
+
+ Md = EVP_get_digestbyobj (HashAlgo->algorithm);
+ if (Md == NULL) {
+ goto _Exit;
+ }
+
+ MdSize = EVP_MD_size (Md);
+ HashedMsg = AllocateZeroPool (MdSize);
+ if (HashedMsg == NULL) {
+ goto _Exit;
+ }
+ EVP_DigestInit (&MdCtx, Md);
+ EVP_DigestUpdate (&MdCtx, TimestampedData, DataSize);
+ EVP_DigestFinal (&MdCtx, HashedMsg, NULL);
+ if ((MdSize == (UINTN)ASN1_STRING_length (Imprint->HashedMessage)) &&
+ (CompareMem (HashedMsg, ASN1_STRING_data (Imprint->HashedMessage), MdSize) != 0)) {
+ goto _Exit;
+ }
+
+ //
+ // -- Check Nonces
+ //
+ if (TstInfo->Nonce != NULL) {
+ //
+ // Nonces is optional, No error if no nonce is returned;
+ //
+ }
+
+ //
+ // -- Check if the TSA name and signer certificate is matched.
+ //
+ if (TstInfo->Tsa != NULL) {
+ //
+ // Ignored the optional Tsa field checking.
+ //
+ }
+
+ Status = TRUE;
+
+_Exit:
+ X509_ALGOR_free (HashAlgo);
+ if (HashedMsg != NULL) {
+ FreePool (HashedMsg);
+ }
+
+ return Status;
+}
+
+/**
+ Verifies the validility of a TimeStamp Token as described in RFC 3161 ("Internet
+ X.509 Public Key Infrastructure Time-Stamp Protocol (TSP)").
+
+ If TSToken is NULL, then return FALSE.
+ If TimestampedData is NULL, then return FALSE.
+
+ @param[in] TSToken Pointer to the RFC3161 TimeStamp Token, which is generated
+ by a TSA and located in the software publisher's SignerInfo
+ structure.
+ @param[in] TokenSize Size of the TimeStamp Token in bytes.
+ @param[in] TsaCert Pointer to a trusted/root TSA certificate encoded in DER.
+ @param[in] CertSize Size of the trusted TSA certificate in bytes.
+ @param[in] TimestampedData Pointer to the data to be time-stamped.
+ @param[in] DataSize Size of timestamped data in bytes.
+ @param[out] SigningTime Return the time of timestamp generation time if the timestamp
+ signature is valid.
+
+ @retval TRUE The specified timestamp token is valid.
+ @retval FALSE Invalid timestamp token.
+
+**/
+BOOLEAN
+EFIAPI
+TimestampTokenVerify (
+ IN CONST UINT8 *TSToken,
+ IN UINTN TokenSize,
+ IN CONST UINT8 *TsaCert,
+ IN UINTN CertSize,
+ IN CONST UINT8 *TimestampedData,
+ IN UINTN DataSize,
+ OUT EFI_TIME *SigningTime
+ )
+{
+ BOOLEAN Status;
+ CONST UINT8 *TokenTemp;
+ PKCS7 *Pkcs7;
+ X509 *Cert;
+ X509_STORE *CertStore;
+ BIO *OutBio;
+ UINT8 *TstData;
+ UINTN TstSize;
+ UINT8 *TstTemp;
+ TS_TST_INFO *TstInfo;
+
+ Status = FALSE;
+
+ //
+ // Check input parameters
+ //
+ if ((TSToken == NULL) || (TsaCert == NULL) || (TimestampedData == NULL) ||
+ (TokenSize > INT_MAX) || (CertSize > INT_MAX) || (DataSize > INT_MAX)) {
+ return FALSE;
+ }
+
+ //
+ // Initializations
+ //
+ if (SigningTime != NULL) {
+ SetMem (SigningTime, sizeof (EFI_TIME), 0);
+ }
+ Pkcs7 = NULL;
+ Cert = NULL;
+ CertStore = NULL;
+ OutBio = NULL;
+ TstData = NULL;
+ TstInfo = NULL;
+
+ //
+ // TimeStamp Token should contain one valid DER-encoded ASN.1 PKCS#7 structure.
+ //
+ TokenTemp = TSToken;
+ Pkcs7 = d2i_PKCS7 (NULL, (const unsigned char **) &TokenTemp, (int) TokenSize);
+ if (Pkcs7 == NULL) {
+ goto _Exit;
+ }
+
+ //
+ // The timestamp signature (TSA's response) will be one PKCS#7 signed data.
+ //
+ if (!PKCS7_type_is_signed (Pkcs7)) {
+ goto _Exit;
+ }
+
+ //
+ // Read the trusted TSA certificate (DER-encoded), and Construct X509 Certificate.
+ //
+ Cert = d2i_X509 (NULL, &TsaCert, (long) CertSize);
+ if (Cert == NULL) {
+ goto _Exit;
+ }
+
+ //
+ // Setup X509 Store for trusted certificate.
+ //
+ CertStore = X509_STORE_new ();
+ if ((CertStore == NULL) || !(X509_STORE_add_cert (CertStore, Cert))) {
+ goto _Exit;
+ }
+
+ //
+ // Register customized X509 verification callback function to support
+ // trusted intermediate TSA certificate anchor.
+ //
+ CertStore->verify_cb = TSVerifyCallback;
+
+ X509_STORE_set_purpose (CertStore, X509_PURPOSE_ANY);
+
+ //
+ // Verifies the PKCS#7 signedData structure, and output the signed contents.
+ //
+ OutBio = BIO_new (BIO_s_mem ());
+ if (OutBio == NULL) {
+ goto _Exit;
+ }
+ if (!PKCS7_verify (Pkcs7, NULL, CertStore, NULL, OutBio, PKCS7_BINARY)) {
+ goto _Exit;
+ }
+
+ //
+ // Read the signed contents detached in timestamp signature.
+ //
+ TstData = AllocateZeroPool (2048);
+ if (TstData == NULL) {
+ goto _Exit;
+ }
+ TstSize = BIO_read (OutBio, (void *) TstData, 2048);
+
+ //
+ // Construct TS_TST_INFO structure from the signed contents.
+ //
+ TstTemp = TstData;
+ TstInfo = d2i_TS_TST_INFO (NULL, &TstTemp, (int)TstSize);
+ if (TstInfo == NULL) {
+ goto _Exit;
+ }
+
+ //
+ // Check TS_TST_INFO structure.
+ //
+ Status = CheckTSTInfo (TstInfo, TimestampedData, DataSize);
+ if (!Status) {
+ goto _Exit;
+ }
+
+ //
+ // Retrieve the signing time from TS_TST_INFO structure.
+ //
+ if (SigningTime != NULL) {
+ SetMem (SigningTime, sizeof (EFI_TIME), 0);
+ Status = ConvertAsn1TimeToEfiTime (TstInfo->GenTime, SigningTime);
+ }
+
+_Exit:
+ //
+ // Release Resources
+ //
+ PKCS7_free (Pkcs7);
+ X509_free (Cert);
+ X509_STORE_free (CertStore);
+ BIO_free (OutBio);
+ TS_TST_INFO_free (TstInfo);
+
+ if (TstData != NULL) {
+ FreePool (TstData);
+ }
+
+ return Status;
+}
+
+/**
+ Verifies the validility of a RFC3161 Timestamp CounterSignature embedded in PE/COFF Authenticode
+ signature.
+
+ If AuthData is NULL, then return FALSE.
+
+ @param[in] AuthData Pointer to the Authenticode Signature retrieved from signed
+ PE/COFF image to be verified.
+ @param[in] DataSize Size of the Authenticode Signature in bytes.
+ @param[in] TsaCert Pointer to a trusted/root TSA certificate encoded in DER, which
+ is used for TSA certificate chain verification.
+ @param[in] CertSize Size of the trusted certificate in bytes.
+ @param[out] SigningTime Return the time of timestamp generation time if the timestamp
+ signature is valid.
+
+ @retval TRUE The specified Authenticode includes a valid RFC3161 Timestamp CounterSignature.
+ @retval FALSE No valid RFC3161 Timestamp CounterSignature in the specified Authenticode data.
+
+**/
+BOOLEAN
+EFIAPI
+ImageTimestampVerify (
+ IN CONST UINT8 *AuthData,
+ IN UINTN DataSize,
+ IN CONST UINT8 *TsaCert,
+ IN UINTN CertSize,
+ OUT EFI_TIME *SigningTime
+ )
+{
+ BOOLEAN Status;
+ PKCS7 *Pkcs7;
+ STACK_OF(PKCS7_SIGNER_INFO) *SignerInfos;
+ PKCS7_SIGNER_INFO *SignInfo;
+ UINTN Index;
+ STACK_OF(X509_ATTRIBUTE) *Sk;
+ X509_ATTRIBUTE *Xa;
+ ASN1_TYPE *Asn1Type;
+ ASN1_OCTET_STRING *EncDigest;
+ UINT8 *TSToken;
+ UINTN TokenSize;
+
+ //
+ // Input Parameters Checking.
+ //
+ if ((AuthData == NULL) || (TsaCert == NULL)) {
+ return FALSE;
+ }
+
+ if ((DataSize > INT_MAX) || (CertSize > INT_MAX)) {
+ return FALSE;
+ }
+
+ //
+ // Register & Initialize necessary digest algorithms for PKCS#7 Handling.
+ //
+ if ((EVP_add_digest (EVP_md5 ()) == 0) || (EVP_add_digest (EVP_sha1 ()) == 0) ||
+ (EVP_add_digest (EVP_sha256 ()) == 0) || (EVP_add_digest_alias (SN_sha1WithRSAEncryption, SN_sha1WithRSA)) == 0) {
+ return FALSE;
+ }
+
+ //
+ // Initialization.
+ //
+ Status = FALSE;
+ Pkcs7 = NULL;
+ SignInfo = NULL;
+
+ //
+ // Decode ASN.1-encoded Authenticode data into PKCS7 structure.
+ //
+ Pkcs7 = d2i_PKCS7 (NULL, (const unsigned char **) &AuthData, (int) DataSize);
+ if (Pkcs7 == NULL) {
+ goto _Exit;
+ }
+
+ //
+ // Check if there is one and only one signer.
+ //
+ SignerInfos = PKCS7_get_signer_info (Pkcs7);
+ if (!SignerInfos || (sk_PKCS7_SIGNER_INFO_num (SignerInfos) != 1)) {
+ goto _Exit;
+ }
+
+ //
+ // Locate the TimeStamp CounterSignature.
+ //
+ SignInfo = sk_PKCS7_SIGNER_INFO_value (SignerInfos, 0);
+ if (SignInfo == NULL) {
+ goto _Exit;
+ }
+
+ //
+ // Locate Message Digest which will be the data to be time-stamped.
+ //
+ EncDigest = SignInfo->enc_digest;
+ if (EncDigest == NULL) {
+ goto _Exit;
+ }
+
+ //
+ // The RFC3161 timestamp counterSignature is contained in unauthenticatedAttributes field
+ // of SignerInfo.
+ //
+ Sk = SignInfo->unauth_attr;
+ if (Sk == NULL) { // No timestamp counterSignature.
+ goto _Exit;
+ }
+
+ Asn1Type = NULL;
+ for (Index = 0; Index < (UINTN) sk_X509_ATTRIBUTE_num (Sk); Index++) {
+ //
+ // Search valid RFC3161 timestamp counterSignature based on OBJID.
+ //
+ Xa = sk_X509_ATTRIBUTE_value (Sk, (int)Index);
+ if ((Xa->object->length != sizeof (mSpcRFC3161OidValue)) ||
+ (CompareMem (Xa->object->data, mSpcRFC3161OidValue, sizeof (mSpcRFC3161OidValue)) != 0)) {
+ continue;
+ }
+ Asn1Type = sk_ASN1_TYPE_value (Xa->value.set, 0);
+ }
+
+ if (Asn1Type == NULL) {
+ Status = FALSE;
+ goto _Exit;
+ }
+ TSToken = Asn1Type->value.octet_string->data;
+ TokenSize = Asn1Type->value.octet_string->length;
+
+ //
+ // TimeStamp counterSignature (Token) verification.
+ //
+ Status = TimestampTokenVerify (
+ TSToken,
+ TokenSize,
+ TsaCert,
+ CertSize,
+ EncDigest->data,
+ EncDigest->length,
+ SigningTime
+ );
+
+_Exit:
+ //
+ // Release Resources
+ //
+ PKCS7_free (Pkcs7);
+
+ return Status;
+}
|