mirror of
https://github.com/gravitational/teleport.git
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Alan Parra
7dbefc24f9
Allow explicit Touch ID prompts to be triggered via Go code, which will be used to guard the (upcoming) credential picker prompt. To avoid double-prompting users during Touch ID authentication we have to set a grace period in the underlying LAContext and share it between the functions. Note that AuthContextGuard (native) uses the LAContext explicitly, whereas Authenticate (native) uses it through the SecItemCopyMatching query dictionary. No UX visible changes are made in the PR, despite the fact that prompting occurs a bit earlier. #13901 * Allow explicit Touch ID prompts
86 lines
2.6 KiB
Objective-C
86 lines
2.6 KiB
Objective-C
//go:build touchid
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// +build touchid
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// Copyright 2022 Gravitational, Inc
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "context.h"
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#import <CoreFoundation/CoreFoundation.h>
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#import <Foundation/Foundation.h>
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#import <LocalAuthentication/LocalAuthentication.h>
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#include <stdint.h>
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#include <dispatch/dispatch.h>
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#include "common.h"
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// runGoFuncHandle is provided via CGO exports.
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// (#include "_cgo_export.h" also works.)
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extern void runGoFuncHandle(uintptr_t handle);
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LAContext *GetLAContextFromAuth(AuthContext *actx) {
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if (actx == NULL) {
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return [[LAContext alloc] init];
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}
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if (actx->la_ctx == NULL) {
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actx->la_ctx = [[LAContext alloc] init];
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actx->la_ctx.touchIDAuthenticationAllowableReuseDuration = 10; // seconds
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}
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return actx->la_ctx;
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}
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int AuthContextGuard(AuthContext *actx, const char *reason, uintptr_t handle,
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char **errOut) {
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LAContext *ctx = GetLAContextFromAuth(actx);
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__block int res = 0;
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__block NSString *nsError = NULL;
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// A semaphore is needed, otherwise we return before the prompt has a chance
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// to resolve.
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dispatch_semaphore_t sema = dispatch_semaphore_create(0);
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[ctx evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
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localizedReason:[NSString stringWithUTF8String:reason]
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reply:^void(BOOL success, NSError *_Nullable error) {
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if (success) {
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runGoFuncHandle(handle);
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} else {
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res = -1;
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nsError = [error localizedDescription];
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}
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dispatch_semaphore_signal(sema);
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}];
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dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
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// sema released by ARC.
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if (nsError) {
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*errOut = CopyNSString(nsError);
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} else if (res != errSecSuccess) {
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CFStringRef err = SecCopyErrorMessageString(res, NULL);
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NSString *nsErr = (__bridge_transfer NSString *)err;
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*errOut = CopyNSString(nsErr);
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}
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return res;
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}
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void AuthContextClose(AuthContext *actx) {
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if (actx == NULL) {
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return;
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}
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actx->la_ctx = NULL; // Let ARC collect the LAContext.
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}
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