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132 lines
3.5 KiB
132 lines
3.5 KiB
4 years ago
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/** @file
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Non-runtime specific implementation of PKCS#7 SignedData Verification Wrapper.
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Copyright (c) 2019, 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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/**
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Extracts the attached content from a PKCS#7 signed data if existed. The input signed
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data could be wrapped in a ContentInfo structure.
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If P7Data, Content, or ContentSize is NULL, then return FALSE. If P7Length overflow,
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then return FALSE. If the P7Data is not correctly formatted, then return FALSE.
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Caution: This function may receive untrusted input. So this function will do
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basic check for PKCS#7 data structure.
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@param[in] P7Data Pointer to the PKCS#7 signed data to process.
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@param[in] P7Length Length of the PKCS#7 signed data in bytes.
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@param[out] Content Pointer to the extracted content from the PKCS#7 signedData.
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It's caller's responsibility to free the buffer with FreePool().
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@param[out] ContentSize The size of the extracted content in bytes.
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@retval TRUE The P7Data was correctly formatted for processing.
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@retval FALSE The P7Data was not correctly formatted for processing.
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**/
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BOOLEAN
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EFIAPI
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Pkcs7GetAttachedContent (
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IN CONST UINT8 *P7Data,
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IN UINTN P7Length,
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OUT VOID **Content,
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OUT UINTN *ContentSize
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)
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{
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BOOLEAN Status;
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PKCS7 *Pkcs7;
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UINT8 *SignedData;
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UINTN SignedDataSize;
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BOOLEAN Wrapped;
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CONST UINT8 *Temp;
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ASN1_OCTET_STRING *OctStr;
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//
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// Check input parameter.
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//
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if ((P7Data == NULL) || (P7Length > INT_MAX) || (Content == NULL) || (ContentSize == NULL)) {
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return FALSE;
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}
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*Content = NULL;
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Pkcs7 = NULL;
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SignedData = NULL;
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OctStr = NULL;
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Status = WrapPkcs7Data (P7Data, P7Length, &Wrapped, &SignedData, &SignedDataSize);
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if (!Status || (SignedDataSize > INT_MAX)) {
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goto _Exit;
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}
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Status = FALSE;
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//
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// Decoding PKCS#7 SignedData
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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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// The type of Pkcs7 must be signedData
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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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//
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// Check for detached or attached content
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//
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if (PKCS7_get_detached (Pkcs7)) {
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//
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// No Content supplied for PKCS7 detached signedData
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//
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*Content = NULL;
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*ContentSize = 0;
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} else {
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//
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// Retrieve the attached content in PKCS7 signedData
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//
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OctStr = Pkcs7->d.sign->contents->d.data;
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if ((OctStr->length > 0) && (OctStr->data != NULL)) {
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*ContentSize = OctStr->length;
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*Content = AllocatePool (*ContentSize);
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if (*Content == NULL) {
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*ContentSize = 0;
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goto _Exit;
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}
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CopyMem (*Content, OctStr->data, *ContentSize);
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}
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}
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Status = TRUE;
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_Exit:
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//
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// Release Resources
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//
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PKCS7_free (Pkcs7);
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if (!Wrapped) {
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OPENSSL_free (SignedData);
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}
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return Status;
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}
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