mirror of https://github.com/acidanthera/audk.git
672 lines
18 KiB
C
672 lines
18 KiB
C
/** @file
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PKCS#7 SignedData Verification Wrapper Implementation over OpenSSL.
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Caution: This module requires additional review when modified.
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This library will have external input - signature (e.g. UEFI Authenticated
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Variable). It may by input in SMM mode.
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This external input must be validated carefully to avoid security issue like
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buffer overflow, integer overflow.
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WrapPkcs7Data(), Pkcs7GetSigners(), Pkcs7Verify() will get UEFI Authenticated
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Variable and will do basic check for data structure.
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Copyright (c) 2009 - 2012, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "InternalCryptLib.h"
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#include <openssl/objects.h>
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#include <openssl/x509.h>
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#include <openssl/x509v3.h>
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#include <openssl/pkcs7.h>
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UINT8 mOidValue[9] = { 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x07, 0x02 };
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/**
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Verification callback function to override any existing callbacks in OpenSSL
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for intermediate certificate supports.
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@param[in] Status Original status before calling this callback.
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@param[in] Context X509 store context.
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@retval 1 Current X509 certificate is verified successfully.
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@retval 0 Verification failed.
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**/
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int
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X509VerifyCb (
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IN int Status,
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IN X509_STORE_CTX *Context
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)
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{
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X509_OBJECT *Obj;
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INTN Error;
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INTN Index;
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INTN Count;
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Obj = NULL;
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Error = (INTN) X509_STORE_CTX_get_error (Context);
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//
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// X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT and X509_V_ERR_UNABLE_TO_GET_ISSUER_
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// CERT_LOCALLY mean a X509 certificate is not self signed and its issuer
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// can not be found in X509_verify_cert of X509_vfy.c.
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// In order to support intermediate certificate node, we override the
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// errors if the certification is obtained from X509 store, i.e. it is
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// a trusted ceritifcate node that is enrolled by user.
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// Besides,X509_V_ERR_CERT_UNTRUSTED and X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE
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// are also ignored to enable such feature.
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//
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if ((Error == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT) ||
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(Error == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY)) {
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Obj = (X509_OBJECT *) malloc (sizeof (X509_OBJECT));
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if (Obj == NULL) {
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return 0;
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}
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Obj->type = X509_LU_X509;
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Obj->data.x509 = Context->current_cert;
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CRYPTO_w_lock (CRYPTO_LOCK_X509_STORE);
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if (X509_OBJECT_retrieve_match (Context->ctx->objs, Obj)) {
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Status = 1;
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} else {
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//
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// If any certificate in the chain is enrolled as trusted certificate,
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// pass the certificate verification.
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//
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if (Error == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY) {
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Count = (INTN) sk_X509_num (Context->chain);
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for (Index = 0; Index < Count; Index++) {
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Obj->data.x509 = sk_X509_value (Context->chain, (int) Index);
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if (X509_OBJECT_retrieve_match (Context->ctx->objs, Obj)) {
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Status = 1;
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break;
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}
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}
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}
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}
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CRYPTO_w_unlock (CRYPTO_LOCK_X509_STORE);
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}
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if ((Error == X509_V_ERR_CERT_UNTRUSTED) ||
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(Error == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE)) {
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Status = 1;
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}
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if (Obj != NULL) {
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OPENSSL_free (Obj);
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}
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return Status;
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}
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/**
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Check input P7Data is a wrapped ContentInfo structure or not. If not construct
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a new structure to wrap P7Data.
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Caution: This function may receive untrusted input.
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UEFI Authenticated Variable is external input, so this function will do basic
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check for PKCS#7 data structure.
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@param[in] P7Data Pointer to the PKCS#7 message to verify.
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@param[in] P7Length Length of the PKCS#7 message in bytes.
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@param[out] WrapFlag If TRUE P7Data is a ContentInfo structure, otherwise
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return FALSE.
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@param[out] WrapData If return status of this function is TRUE:
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1) when WrapFlag is TRUE, pointer to P7Data.
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2) when WrapFlag is FALSE, pointer to a new ContentInfo
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structure. It's caller's responsibility to free this
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buffer.
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@param[out] WrapDataSize Length of ContentInfo structure in bytes.
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@retval TRUE The operation is finished successfully.
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@retval FALSE The operation is failed due to lack of resources.
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**/
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BOOLEAN
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WrapPkcs7Data (
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IN CONST UINT8 *P7Data,
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IN UINTN P7Length,
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OUT BOOLEAN *WrapFlag,
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OUT UINT8 **WrapData,
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OUT UINTN *WrapDataSize
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)
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{
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BOOLEAN Wrapped;
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UINT8 *SignedData;
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//
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// Check whether input P7Data is a wrapped ContentInfo structure or not.
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//
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Wrapped = FALSE;
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if ((P7Data[4] == 0x06) && (P7Data[5] == 0x09)) {
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if (CompareMem (P7Data + 6, mOidValue, sizeof (mOidValue)) == 0) {
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if ((P7Data[15] == 0xA0) && (P7Data[16] == 0x82)) {
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Wrapped = TRUE;
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}
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}
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}
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if (Wrapped) {
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*WrapData = (UINT8 *) P7Data;
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*WrapDataSize = P7Length;
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} else {
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//
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// Wrap PKCS#7 signeddata to a ContentInfo structure - add a header in 19 bytes.
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//
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*WrapDataSize = P7Length + 19;
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*WrapData = malloc (*WrapDataSize);
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if (*WrapData == NULL) {
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*WrapFlag = Wrapped;
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return FALSE;
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}
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SignedData = *WrapData;
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//
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// Part1: 0x30, 0x82.
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//
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SignedData[0] = 0x30;
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SignedData[1] = 0x82;
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//
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// Part2: Length1 = P7Length + 19 - 4, in big endian.
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//
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SignedData[2] = (UINT8) (((UINT16) (*WrapDataSize - 4)) >> 8);
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SignedData[3] = (UINT8) (((UINT16) (*WrapDataSize - 4)) & 0xff);
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//
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// Part3: 0x06, 0x09.
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//
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SignedData[4] = 0x06;
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SignedData[5] = 0x09;
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//
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// Part4: OID value -- 0x2A 0x86 0x48 0x86 0xF7 0x0D 0x01 0x07 0x02.
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//
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CopyMem (SignedData + 6, mOidValue, sizeof (mOidValue));
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//
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// Part5: 0xA0, 0x82.
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//
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SignedData[15] = 0xA0;
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SignedData[16] = 0x82;
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//
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// Part6: Length2 = P7Length, in big endian.
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//
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SignedData[17] = (UINT8) (((UINT16) P7Length) >> 8);
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SignedData[18] = (UINT8) (((UINT16) P7Length) & 0xff);
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//
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// Part7: P7Data.
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//
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CopyMem (SignedData + 19, P7Data, P7Length);
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}
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*WrapFlag = Wrapped;
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return TRUE;
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}
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/**
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Pop single certificate from STACK_OF(X509).
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If X509Stack, Cert, or CertSize is NULL, then return FALSE.
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@param[in] X509Stack Pointer to a X509 stack object.
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@param[out] Cert Pointer to a X509 certificate.
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@param[out] CertSize Length of output X509 certificate in bytes.
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@retval TRUE The X509 stack pop succeeded.
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@retval FALSE The pop operation failed.
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**/
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BOOLEAN
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X509PopCertificate (
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IN VOID *X509Stack,
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OUT UINT8 **Cert,
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OUT UINTN *CertSize
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)
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{
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BIO *CertBio;
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X509 *X509Cert;
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STACK_OF(X509) *CertStack;
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BOOLEAN Status;
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INT32 Result;
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INT32 Length;
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VOID *Buffer;
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Status = FALSE;
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if ((X509Stack == NULL) || (Cert == NULL) || (CertSize == NULL)) {
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return Status;
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}
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CertStack = (STACK_OF(X509) *) X509Stack;
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X509Cert = sk_X509_pop (CertStack);
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if (X509Cert == NULL) {
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return Status;
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}
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Buffer = NULL;
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CertBio = BIO_new (BIO_s_mem ());
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if (CertBio == NULL) {
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return Status;
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}
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Result = i2d_X509_bio (CertBio, X509Cert);
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if (Result == 0) {
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goto _Exit;
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}
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Length = ((BUF_MEM *) CertBio->ptr)->length;
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if (Length <= 0) {
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goto _Exit;
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}
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Buffer = malloc (Length);
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if (Buffer == NULL) {
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goto _Exit;
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}
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Result = BIO_read (CertBio, Buffer, Length);
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if (Result != Length) {
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goto _Exit;
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}
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*Cert = Buffer;
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*CertSize = Length;
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Status = TRUE;
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_Exit:
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BIO_free (CertBio);
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if (!Status && (Buffer != NULL)) {
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free (Buffer);
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}
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return Status;
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}
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/**
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Get the signer's certificates from PKCS#7 signed data as described in "PKCS #7:
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Cryptographic Message Syntax Standard". The input signed data could be wrapped
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in a ContentInfo structure.
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If P7Data, CertStack, StackLength, TrustedCert or CertLength is NULL, then
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return FALSE. If P7Length overflow, then return FAlSE.
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Caution: This function may receive untrusted input.
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UEFI Authenticated Variable is external input, so this function will do basic
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check for PKCS#7 data structure.
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@param[in] P7Data Pointer to the PKCS#7 message to verify.
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@param[in] P7Length Length of the PKCS#7 message in bytes.
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@param[out] CertStack Pointer to Signer's certificates retrieved from P7Data.
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It's caller's responsiblity to free the buffer.
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@param[out] StackLength Length of signer's certificates in bytes.
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@param[out] TrustedCert Pointer to a trusted certificate from Signer's certificates.
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It's caller's responsiblity to free the buffer.
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@param[out] CertLength Length of the trusted certificate in bytes.
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@retval TRUE The operation is finished successfully.
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@retval FALSE Error occurs during the operation.
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**/
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BOOLEAN
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EFIAPI
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Pkcs7GetSigners (
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IN CONST UINT8 *P7Data,
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IN UINTN P7Length,
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OUT UINT8 **CertStack,
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OUT UINTN *StackLength,
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OUT UINT8 **TrustedCert,
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OUT UINTN *CertLength
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)
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{
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PKCS7 *Pkcs7;
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BOOLEAN Status;
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UINT8 *SignedData;
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UINT8 *Temp;
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UINTN SignedDataSize;
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BOOLEAN Wrapped;
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STACK_OF(X509) *Stack;
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UINT8 Index;
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UINT8 *CertBuf;
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UINT8 *OldBuf;
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UINTN BufferSize;
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UINTN OldSize;
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UINT8 *SingleCert;
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UINTN SingleCertSize;
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if ((P7Data == NULL) || (CertStack == NULL) || (StackLength == NULL) ||
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(TrustedCert == NULL) || (CertLength == NULL) || (P7Length > INT_MAX)) {
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return FALSE;
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}
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Status = WrapPkcs7Data (P7Data, P7Length, &Wrapped, &SignedData, &SignedDataSize);
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if (!Status) {
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return Status;
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}
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Status = FALSE;
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Pkcs7 = NULL;
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Stack = NULL;
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CertBuf = NULL;
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OldBuf = NULL;
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SingleCert = NULL;
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//
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// Retrieve PKCS#7 Data (DER encoding)
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//
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if (SignedDataSize > INT_MAX) {
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goto _Exit;
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}
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Temp = SignedData;
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Pkcs7 = d2i_PKCS7 (NULL, (const unsigned char **) &Temp, (int) SignedDataSize);
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if (Pkcs7 == NULL) {
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goto _Exit;
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}
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//
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// Check if it's PKCS#7 Signed Data (for Authenticode Scenario)
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//
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if (!PKCS7_type_is_signed (Pkcs7)) {
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goto _Exit;
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}
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Stack = PKCS7_get0_signers(Pkcs7, NULL, PKCS7_BINARY);
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if (Stack == NULL) {
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goto _Exit;
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}
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//
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// Convert CertStack to buffer in following format:
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// UINT8 CertNumber;
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// UINT32 Cert1Length;
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// UINT8 Cert1[];
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// UINT32 Cert2Length;
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// UINT8 Cert2[];
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// ...
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// UINT32 CertnLength;
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// UINT8 Certn[];
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//
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BufferSize = sizeof (UINT8);
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OldSize = BufferSize;
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for (Index = 0; ; Index++) {
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Status = X509PopCertificate (Stack, &SingleCert, &SingleCertSize);
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if (!Status) {
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break;
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}
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OldSize = BufferSize;
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OldBuf = CertBuf;
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BufferSize = OldSize + SingleCertSize + sizeof (UINT32);
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CertBuf = malloc (BufferSize);
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if (CertBuf == NULL) {
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goto _Exit;
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}
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if (OldBuf != NULL) {
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CopyMem (CertBuf, OldBuf, OldSize);
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free (OldBuf);
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OldBuf = NULL;
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}
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WriteUnaligned32 ((UINT32 *) (CertBuf + OldSize), (UINT32) SingleCertSize);
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CopyMem (CertBuf + OldSize + sizeof (UINT32), SingleCert, SingleCertSize);
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free (SingleCert);
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SingleCert = NULL;
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}
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if (CertBuf != NULL) {
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//
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// Update CertNumber.
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//
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CertBuf[0] = Index;
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*CertLength = BufferSize - OldSize - sizeof (UINT32);
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*TrustedCert = malloc (*CertLength);
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if (*TrustedCert == NULL) {
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goto _Exit;
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}
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CopyMem (*TrustedCert, CertBuf + OldSize + sizeof (UINT32), *CertLength);
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*CertStack = CertBuf;
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*StackLength = BufferSize;
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Status = TRUE;
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}
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_Exit:
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//
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// Release Resources
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//
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if (!Wrapped) {
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free (SignedData);
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}
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if (Pkcs7 != NULL) {
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PKCS7_free (Pkcs7);
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}
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if (Stack != NULL) {
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sk_X509_pop_free(Stack, X509_free);
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}
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if (SingleCert != NULL) {
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free (SingleCert);
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}
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if (!Status && (CertBuf != NULL)) {
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free (CertBuf);
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*CertStack = NULL;
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}
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if (OldBuf != NULL) {
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free (OldBuf);
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}
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return Status;
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}
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/**
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Wrap function to use free() to free allocated memory for certificates.
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@param[in] Certs Pointer to the certificates to be freed.
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**/
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VOID
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EFIAPI
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Pkcs7FreeSigners (
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IN UINT8 *Certs
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)
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|
{
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if (Certs == NULL) {
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return;
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}
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free (Certs);
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}
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/**
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Verifies the validility of a PKCS#7 signed data as described in "PKCS #7:
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Cryptographic Message Syntax Standard". The input signed data could be wrapped
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in a ContentInfo structure.
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|
If P7Data, TrustedCert or InData is NULL, then return FALSE.
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If P7Length, CertLength or DataLength overflow, then return FAlSE.
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Caution: This function may receive untrusted input.
|
|
UEFI Authenticated Variable is external input, so this function will do basic
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|
check for PKCS#7 data structure.
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|
|
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@param[in] P7Data Pointer to the PKCS#7 message to verify.
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@param[in] P7Length Length of the PKCS#7 message in bytes.
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@param[in] TrustedCert Pointer to a trusted/root certificate encoded in DER, which
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is used for certificate chain verification.
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@param[in] CertLength Length of the trusted certificate in bytes.
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@param[in] InData Pointer to the content to be verified.
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@param[in] DataLength Length of InData in bytes.
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@retval TRUE The specified PKCS#7 signed data is valid.
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@retval FALSE Invalid PKCS#7 signed data.
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**/
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BOOLEAN
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EFIAPI
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Pkcs7Verify (
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IN CONST UINT8 *P7Data,
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IN UINTN P7Length,
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IN CONST UINT8 *TrustedCert,
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IN UINTN CertLength,
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IN CONST UINT8 *InData,
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IN UINTN DataLength
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)
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{
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PKCS7 *Pkcs7;
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BIO *DataBio;
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BOOLEAN Status;
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X509 *Cert;
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X509_STORE *CertStore;
|
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UINT8 *SignedData;
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UINT8 *Temp;
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UINTN SignedDataSize;
|
|
BOOLEAN Wrapped;
|
|
|
|
//
|
|
// Check input parameters.
|
|
//
|
|
if (P7Data == NULL || TrustedCert == NULL || InData == NULL ||
|
|
P7Length > INT_MAX || CertLength > INT_MAX || DataLength > INT_MAX) {
|
|
return FALSE;
|
|
}
|
|
|
|
Pkcs7 = NULL;
|
|
DataBio = NULL;
|
|
Cert = NULL;
|
|
CertStore = NULL;
|
|
|
|
//
|
|
// Register & Initialize necessary digest algorithms for PKCS#7 Handling
|
|
//
|
|
if (EVP_add_digest (EVP_md5 ()) == 0) {
|
|
return FALSE;
|
|
}
|
|
if (EVP_add_digest (EVP_sha1 ()) == 0) {
|
|
return FALSE;
|
|
}
|
|
if (EVP_add_digest (EVP_sha256 ()) == 0) {
|
|
return FALSE;
|
|
}
|
|
if (EVP_add_digest_alias (SN_sha1WithRSAEncryption, SN_sha1WithRSA) == 0) {
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
Status = WrapPkcs7Data (P7Data, P7Length, &Wrapped, &SignedData, &SignedDataSize);
|
|
if (!Status) {
|
|
return Status;
|
|
}
|
|
|
|
Status = FALSE;
|
|
|
|
//
|
|
// Retrieve PKCS#7 Data (DER encoding)
|
|
//
|
|
if (SignedDataSize > INT_MAX) {
|
|
goto _Exit;
|
|
}
|
|
|
|
Temp = SignedData;
|
|
Pkcs7 = d2i_PKCS7 (NULL, (const unsigned char **) &Temp, (int) SignedDataSize);
|
|
if (Pkcs7 == NULL) {
|
|
goto _Exit;
|
|
}
|
|
|
|
//
|
|
// Check if it's PKCS#7 Signed Data (for Authenticode Scenario)
|
|
//
|
|
if (!PKCS7_type_is_signed (Pkcs7)) {
|
|
goto _Exit;
|
|
}
|
|
|
|
//
|
|
// Read DER-encoded root certificate and Construct X509 Certificate
|
|
//
|
|
Cert = d2i_X509 (NULL, &TrustedCert, (long) CertLength);
|
|
if (Cert == NULL) {
|
|
goto _Exit;
|
|
}
|
|
|
|
//
|
|
// Setup X509 Store for trusted certificate
|
|
//
|
|
CertStore = X509_STORE_new ();
|
|
if (CertStore == NULL) {
|
|
goto _Exit;
|
|
}
|
|
if (!(X509_STORE_add_cert (CertStore, Cert))) {
|
|
goto _Exit;
|
|
}
|
|
|
|
//
|
|
// Register customized X509 verification callback function to support
|
|
// trusted intermediate certificate anchor.
|
|
//
|
|
CertStore->verify_cb = X509VerifyCb;
|
|
|
|
//
|
|
// For generic PKCS#7 handling, InData may be NULL if the content is present
|
|
// in PKCS#7 structure. So ignore NULL checking here.
|
|
//
|
|
DataBio = BIO_new (BIO_s_mem ());
|
|
BIO_write (DataBio, InData, (int)DataLength);
|
|
|
|
//
|
|
// OpenSSL PKCS7 Verification by default checks for SMIME (email signing) and
|
|
// doesn't support the extended key usage for Authenticode Code Signing.
|
|
// Bypass the certificate purpose checking by enabling any purposes setting.
|
|
//
|
|
X509_STORE_set_purpose (CertStore, X509_PURPOSE_ANY);
|
|
|
|
//
|
|
// Verifies the PKCS#7 signedData structure
|
|
//
|
|
Status = (BOOLEAN) PKCS7_verify (Pkcs7, NULL, CertStore, DataBio, NULL, PKCS7_BINARY);
|
|
|
|
_Exit:
|
|
//
|
|
// Release Resources
|
|
//
|
|
BIO_free (DataBio);
|
|
X509_free (Cert);
|
|
X509_STORE_free (CertStore);
|
|
PKCS7_free (Pkcs7);
|
|
|
|
if (!Wrapped) {
|
|
OPENSSL_free (SignedData);
|
|
}
|
|
|
|
return Status;
|
|
}
|