chrome.certificateProvider
- Description
Use this API to expose certificates to the platform which can use these certificates for TLS authentications.
- Permissions
certificateProvider - AvailabilityChrome 46+
Usage
Typical usage of this API to expose client certificates to ChromeOS follows these steps:
- The Extension registers for the events onCertificatesUpdateRequested and onSignatureRequested.
- The Extension calls setCertificates to provide the initial list of certificates after the initialization.
- The Extension monitors the changes in the list of available certificates and calls setCertificates to notify the browser about every such change.
- During a TLS handshake, the browser receives a client certificate request. With an onCertificatesUpdateRequested event, the browser asks the Extension to report all certificates that it currently provides.
- The Extension reports back with the currently available certificates, using the setCertificates method.
- The browser matches all available certificates with the client certificate request from the remote host. The matches are presented to the user in a selection dialog.
- The user can select a certificate and thereby approve the authentication or abort the authentication.
- If the user aborts the authentication or no certificate matched the request, the TLS client authentication is aborted.
- Otherwise, if the user approves the authentication with a certificate provided by this Extension, the browser requests the Extension to sign the data to continue the TLS handshake. The request is sent as a onSignatureRequested event.
- This event contains input data, declares which algorithm has to be used to generate the signature, and refers to one of the certificates that were reported by this Extension. The Extension must create a signature for the given data using the private key associated with the referenced certificate. Creating the signature might require prepending a DigestInfo and padding the result before the actual signing.
- The Extension sends back the signature to the browser using the reportSignature method. If the signature couldn't be calculated, the method has to be called without signature.
- If the signature was provided, the browser completes the TLS handshake.
The actual sequence of steps can be different. For example, the user will not be asked to select a certificate if the enterprise policy to automatically select a certificate is used (see AutoSelectCertificateForUrls and Chrome policies for users).
In the Extension, this can look similar to the following snippet:
function collectAvailableCertificates() {
// Return all certificates that this Extension can currently provide.
// For example:
return [{
certificateChain: [new Uint8Array(...)],
supportedAlgorithms: ['RSASSA_PKCS1_v1_5_SHA256']
}];
}
// The Extension calls this function every time the currently available list of
// certificates changes, and also once after the Extension's initialization.
function onAvailableCertificatesChanged() {
chrome.certificateProvider.setCertificates({
clientCertificates: collectAvailableCertificates()
});
}
function handleCertificatesUpdateRequest(request) {
// Report the currently available certificates as a response to the request
// event. This is important for supporting the case when the Extension is
// unable to detect the changes proactively.
chrome.certificateProvider.setCertificates({
certificatesRequestId: request.certificatesRequestId,
clientCertificates: collectAvailableCertificates()
});
}
// Returns a private key handle for the given DER-encoded certificate.
// |certificate| is an ArrayBuffer.
function getPrivateKeyHandle(certificate) {...}
// Digests and signs |input| with the given private key. |input| is an
// ArrayBuffer. |algorithm| is an Algorithm.
// Returns the signature as ArrayBuffer.
function signUnhashedData(privateKey, input, algorithm) {...}
function handleSignatureRequest(request) {
// Look up the handle to the private key of |request.certificate|.
const key = getPrivateKeyHandle(request.certificate);
if (!key) {
// Handle if the key isn't available.
console.error('Key for requested certificate no available.');
// Abort the request by reporting the error to the API.
chrome.certificateProvider.reportSignature({
signRequestId: request.signRequestId,
error: 'GENERAL_ERROR'
});
return;
}
const signature = signUnhashedData(key, request.input, request.algorithm);
chrome.certificateProvider.reportSignature({
signRequestId: request.signRequestId,
signature: signature
});
}
chrome.certificateProvider.onCertificatesUpdateRequested.addListener(
handleCertificatesUpdateRequest);
chrome.certificateProvider.onSignatureRequested.addListener(
handleSignatureRequest);Summary
- Types
- Methods
- Events
Types
Algorithm
Types of supported cryptographic signature algorithms.
Type
"RSASSA_PKCS1_v1_5_MD5_SHA1" "RSASSA_PKCS1_v1_5_SHA1" "RSASSA_PKCS1_v1_5_SHA256" "RSASSA_PKCS1_v1_5_SHA384" "RSASSA_PKCS1_v1_5_SHA512" "RSASSA_PSS_SHA256" "RSASSA_PSS_SHA384" "RSASSA_PSS_SHA512"
CertificateInfo
Properties
- certificate
ArrayBuffer
Must be the DER encoding of a X.509 certificate. Currently, only certificates of RSA keys are supported.
- supportedHashes
Hash[]
Must be set to all hashes supported for this certificate. This extension will only be asked for signatures of digests calculated with one of these hash algorithms. This should be in order of decreasing hash preference.
CertificatesUpdateRequest
Properties
- certificatesRequestId
number
Request identifier to be passed to
setCertificates.
ClientCertificateInfo
Properties
- certificateChain
ArrayBuffer[]
The array must contain the DER encoding of the X.509 client certificate as its first element.
This must include exactly one certificate.
- supportedAlgorithms
All algorithms supported for this certificate. The extension will only be asked for signatures using one of these algorithms.
Error
Types of errors that the extension can report.
Value
"GENERAL_ERROR"
Hash
Deprecated. Replaced by Algorithm.
Type
"MD5_SHA1" "SHA1" "SHA256" "SHA384" "SHA512"
PinRequestErrorType
The types of errors that can be presented to the user through the requestPin function.
Type
"INVALID_PIN" "INVALID_PUK" "MAX_ATTEMPTS_EXCEEDED" "UNKNOWN_ERROR"
PinRequestType
The type of code being requested by the extension with requestPin function.
Type
"PIN" "PUK"
PinResponseDetails
Properties
- userInput
string optional
The code provided by the user. Empty if user closed the dialog or some other error occurred.
ReportSignatureDetails
Properties
- error
"GENERAL_ERROR" optional
Error that occurred while generating the signature, if any.
- signRequestId
number
Request identifier that was received via the
onSignatureRequestedevent. - signature
ArrayBuffer optional
The signature, if successfully generated.
RequestPinDetails
Properties
- attemptsLeft
number optional
The number of attempts left. This is provided so that any UI can present this information to the user. Chrome is not expected to enforce this, instead stopPinRequest should be called by the extension with errorType = MAX_ATTEMPTS_EXCEEDED when the number of pin requests is exceeded.
- errorType
PinRequestErrorType optional
The error template displayed to the user. This should be set if the previous request failed, to notify the user of the failure reason.
- requestType
PinRequestType optional
The type of code requested. Default is PIN.
- signRequestId
number
The ID given by Chrome in SignRequest.
SetCertificatesDetails
Properties
- certificatesRequestId
number optional
When called in response to
onCertificatesUpdateRequested, should contain the receivedcertificatesRequestIdvalue. Otherwise, should be unset. - clientCertificates
List of currently available client certificates.
- error
"GENERAL_ERROR" optional
Error that occurred while extracting the certificates, if any. This error will be surfaced to the user when appropriate.
SignatureRequest
Properties
- algorithm
Signature algorithm to be used.
- certificate
ArrayBuffer
The DER encoding of a X.509 certificate. The extension must sign
inputusing the associated private key. - input
ArrayBuffer
Data to be signed. Note that the data is not hashed.
- signRequestId
number
Request identifier to be passed to
reportSignature.
SignRequest
Properties
- certificate
ArrayBuffer
The DER encoding of a X.509 certificate. The extension must sign
digestusing the associated private key. - digest
ArrayBuffer
The digest that must be signed.
- hash
Refers to the hash algorithm that was used to create
digest. - signRequestId
number
Chrome 57+The unique ID to be used by the extension should it need to call a method that requires it, e.g. requestPin.
StopPinRequestDetails
Properties
- errorType
PinRequestErrorType optional
The error template. If present it is displayed to user. Intended to contain the reason for stopping the flow if it was caused by an error, e.g. MAX_ATTEMPTS_EXCEEDED.
- signRequestId
number
The ID given by Chrome in SignRequest.
Methods
reportSignature
chrome.certificateProvider.reportSignature(
details: ReportSignatureDetails,
callback?: function,
)Should be called as a response to onSignatureRequested.
The extension must eventually call this function for every onSignatureRequested event; the API implementation will stop waiting for this call after some time and respond with a timeout error when this function is called.
Parameters
- details
- callback
function optional
The
callbackparameter looks like:() => void
Returns
Promise<void>
PendingThis only returns a
Promisewhen thecallbackparameter is not specified, and with MV3+. The type inside thePromiseis the same as the 1st argument tocallback.
requestPin
chrome.certificateProvider.requestPin(
details: RequestPinDetails,
callback?: function,
)Requests the PIN from the user. Only one ongoing request at a time is allowed. The requests issued while another flow is ongoing are rejected. It's the extension's responsibility to try again later if another flow is in progress.
Parameters
- details
Contains the details about the requested dialog.
- callback
function optional
The
callbackparameter looks like:(details?: PinResponseDetails) => void- details
PinResponseDetails optional
Returns
Promise<PinResponseDetails | undefined>
PendingThis only returns a
Promisewhen thecallbackparameter is not specified, and with MV3+. The type inside thePromiseis the same as the 1st argument tocallback.
setCertificates
chrome.certificateProvider.setCertificates(
details: SetCertificatesDetails,
callback?: function,
)Sets a list of certificates to use in the browser.
The extension should call this function after initialization and on every change in the set of currently available certificates. The extension should also call this function in response to onCertificatesUpdateRequested every time this event is received.
Parameters
- details
The certificates to set. Invalid certificates will be ignored.
- callback
function optional
The
callbackparameter looks like:() => void
Returns
Promise<void>
PendingThis only returns a
Promisewhen thecallbackparameter is not specified, and with MV3+. The type inside thePromiseis the same as the 1st argument tocallback.
stopPinRequest
chrome.certificateProvider.stopPinRequest(
details: StopPinRequestDetails,
callback?: function,
)Stops the pin request started by the requestPin function.
Parameters
- details
Contains the details about the reason for stopping the request flow.
- callback
function optional
The
callbackparameter looks like:() => void
Returns
Promise<void>
PendingThis only returns a
Promisewhen thecallbackparameter is not specified, and with MV3+. The type inside thePromiseis the same as the 1st argument tocallback.
Events
onCertificatesRequested
chrome.certificateProvider.onCertificatesRequested.addListener(
callback: function,
)Use onCertificatesUpdateRequested instead.
This event fires every time the browser requests the current list of certificates provided by this extension. The extension must call reportCallback exactly once with the current list of certificates.
Parameters
- callback
function
The
callbackparameter looks like:(reportCallback: function) => void- reportCallback
function
The
reportCallbackparameter looks like:(certificates: CertificateInfo[], callback: function) => void- certificates
- callback
function
The
callbackparameter looks like:(rejectedCertificates: ArrayBuffer[]) => void- rejectedCertificates
ArrayBuffer[]
onCertificatesUpdateRequested
chrome.certificateProvider.onCertificatesUpdateRequested.addListener(
callback: function,
)This event fires if the certificates set via setCertificates are insufficient or the browser requests updated information. The extension must call setCertificates with the updated list of certificates and the received certificatesRequestId.
Parameters
- callback
function
The
callbackparameter looks like:(request: CertificatesUpdateRequest) => void- request
onSignatureRequested
chrome.certificateProvider.onSignatureRequested.addListener(
callback: function,
)This event fires every time the browser needs to sign a message using a certificate provided by this extension via setCertificates.
The extension must sign the input data from request using the appropriate algorithm and private key and return it by calling reportSignature with the received signRequestId.
Parameters
- callback
function
The
callbackparameter looks like:(request: SignatureRequest) => void- request
onSignDigestRequested
chrome.certificateProvider.onSignDigestRequested.addListener(
callback: function,
)Use onSignatureRequested instead.
This event fires every time the browser needs to sign a message using a certificate provided by this extension in reply to an onCertificatesRequested event. The extension must sign the data in request using the appropriate algorithm and private key and return it by calling reportCallback. reportCallback must be called exactly once.
Parameters
- callback
function
The
callbackparameter looks like:(request: SignRequest, reportCallback: function) => void- request
- reportCallback
function
Chrome 47+The
reportCallbackparameter looks like:(signature?: ArrayBuffer) => void- signature
ArrayBuffer optional