IBackgroundCopyJobHttpOptions::SetClientCertificateByID method (bits2_5.h)

Article
10/13/2021

Specifies the identifier of the client certificate to use for client authentication in an HTTPS (SSL) request.

Syntax

HRESULT SetClientCertificateByID(
  [in] BG_CERT_STORE_LOCATION StoreLocation,
  [in] LPCWSTR                StoreName,
  [in] byte                   *pCertHashBlob
);

Parameters

[in] StoreLocation

Identifies the location of a system store to use for looking up the certificate. For possible values, see the BG_CERT_STORE_LOCATION enumeration.

[in] StoreName

Null-terminated string that contains the name of the certificate store. The string is limited to 256 characters, including the null terminator. You can specify one of the following system stores or an application-defined store. The store can be a local or remote store.

Value	Meaning
CA	Certification authority certificates
MY	Personal certificates
ROOT	Root certificates
SPC	Software Publisher Certificate

[in] pCertHashBlob

SHA1 hash that identifies the certificate. Use a 20 byte buffer for the hash. For more information, see Remarks.

Return value

The following table lists some of the possible return values.

Return code	Description
S_OK	Success.
E_ACCESSDENIED	The user does not have permission to access the store location.
E_NOTIMPL	The value for the StoreLocation parameter is not defined in the BG_CERT_STORE_LOCATION enumeration.
HRESULT_FROM_WIN32(ERROR_FILE_NOT_FOUND)	Could not find a store matching the StoreName parameter.
CRYPT_E_NOT_FOUND	A certificate matching the hash was not found.
RPC_X_NULL_REF_POINTER	The StoreName or pCertHashBlob parameter cannot be NULL.
RPC_X_BAD_STUB_DATA	The pCertHashBlob buffer size is not 20 bytes.
BG_E_STRING_TOO_LONG	The StoreName parameter is more than 256 characters.
BG_E_INVALID_STATE	The state of the job cannot be BG_JOB_STATE_CANCELLED or BG_JOB_STATE_ACKNOWLEDGED.

Remarks

Only the job owner can specify the client certificate. If the job changes ownership, BITS removes the certificate from the job.

The client certificate is applicable only for remote files that use the HTTP or HTTPS protocol. You can specify a certificate for all job types.

When a website accepts but does not require an SSL client certificate, and the BITS job does not specify a client certificate, the job will fail with ERROR_WINHTTP_CLIENT_AUTH_CERT_NEEDED (0x80072f0c).

If you create a certificate for the job or application, you could store the certificate identifier (thumbprint) in the registry or database and use it when a job requires a certificate. You could also enumerate the certificates in the store and let the user choose the certificate. Another alternative is to call the CertFindCertificateInStore function to retrieve the certificate context based on some criteria. Using the context, call the CertGetCertificateContextProperty function to retrieve the hash (specify CERT_HASH_PROP_ID for dwPropId).

SmartCard thumbprints are not supported.

Examples

The following example shows how to specify a client certificate for a job using the thumbprint of the certificate. The example hard codes the thumbprint of the certificate and assumes pJob points to a valid job.


  HRESULT hr = S_OK;
  IBackgroundCopyJob* pJob = NULL;  
  IBackgroundCopyJobHttpOptions* pHttpOptions = NULL;
  BYTE Thumbprint[] = {0xa1, 0x06, 0x6e, 0x13, 0xf2, 0x34, 0x49, 0x0a, 0x22, 0xd7, 0x6f, 0xb2, 0x80, 0xab, 0x68, 0x7d, 0x16, 0x55, 0xb3, 0x14};


  // Retrieve a pointer to the IBackgroundCopyJob4 interface.
  hr = pJob->QueryInterface(__uuidof(IBackgroundCopyJobHttpOptions), (void**)&pHttpOptions);
  pJob->Release();
  if (FAILED(hr))
  {
    wprintf(L"QueryInterface for HttpOptions failed with 0x%x.\n", hr);
    goto cleanup;
  }

  // Use the client certificate in the current user's personal (MY) store.
  hr = pHttpOptions->SetClientCertificateByID(BG_CERT_STORE_LOCATION_CURRENT_USER, 
      L"MY", Thumbprint);
  if (FAILED(hr))
  {
    wprintf(L"pHttpOptions->SetClientCertificateByID failed with 0x%x.\n", hr);
    goto cleanup;
  }


cleanup:

  if (pHttpOptions)
  {
    hr = pHttpOptions->Release();
  }

Requirements

Requirement	Value
Minimum supported client	Windows Vista
Minimum supported server	Windows Server 2008
Target Platform	Windows
Header	bits2_5.h (include Bits.h)
Library	Bits.lib

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