Fix APIs involved in the MTROperationalCredentialsDelegate.

* Rename CSRInfo to MTROperationalCSRInfo
* Rename the properties of MTROperationalCSRInfo to match the spec more closely.
* Rename AttestationInfo to MTRAttestationInfo.
* Fix naming of the API on MTRDeviceController to follow conventions better,
  document the API more clearly, and have it return errors as needed.
* Rename MTRNOCChainIssuer to MTROperationalCertificateIssuer
* Change signature of the one method on MTROperationalCertificateIssuer to have
  better naming, take a controller, and name the completion block "completion".
* Change the completion signature on MTROperationalCertificateIssuer to allow
  the external certificate issuer to return an error (e.g. if its device
  attestation checks failed).
* Don't ask the external issuer for the IPK, since we should already have that
  anyway (from our controller init).
* Allow the external issuer to return nil for the intermediate certificate, to
  indicate that there isn't one.
* Make sure that all our access to mOnNOCCompletionCallback happens on the
  Matter queue, so we don't have thread races on that member.
* Make all the dispatch we do as part of the credential-issuing process async.
* Introduce backwards-compat shims for all the API changes for now.

src/darwin/Framework/CHIP/MTRAttestationInfo.h

@@ -23,6 +23,36 @@ NS_ASSUME_NONNULL_BEGIN
  * Represents information relating to product attestation.
  *
  */
+@interface MTRAttestationInfo : NSObject
+
+@property (nonatomic, copy, readonly) NSData * challenge;
+
+@property (nonatomic, copy, readonly) NSData * nonce;
+
+@property (nonatomic, copy, readonly) NSData * elements;
+
+@property (nonatomic, copy, readonly) NSData * elementsSignature;
+
+@property (nonatomic, copy, readonly) NSData * dac;
+
+@property (nonatomic, copy, readonly) NSData * pai;
+
+@property (nonatomic, copy, readonly) NSData * certificationDeclaration;
+
+@property (nonatomic, copy, readonly) NSData * firmwareInfo;
+
+- (instancetype)initWithChallenge:(NSData *)challenge
+                            nonce:(NSData *)nonce
+                         elements:(NSData *)elements
+                elementsSignature:(NSData *)elementsSignature
+                              dac:(NSData *)dac
+                              pai:(NSData *)pai
+         certificationDeclaration:(NSData *)certificationDeclaration
+                     firmwareInfo:(NSData *)firmwareInfo;
+
+@end
+
+MTR_NEWLY_DEPRECATED("Please use MTRAttestationInfo")
 @interface AttestationInfo : NSObject
 
 @property (nonatomic, copy) NSData * challenge;

src/darwin/Framework/CHIP/MTRAttestationInfo.mm

@@ -19,6 +19,32 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
+@implementation MTRAttestationInfo : NSObject
+
+- (instancetype)initWithChallenge:(NSData *)challenge
+                            nonce:(NSData *)nonce
+                         elements:(NSData *)elements
+                elementsSignature:(NSData *)elementsSignature
+                              dac:(NSData *)dac
+                              pai:(NSData *)pai
+         certificationDeclaration:(NSData *)certificationDeclaration
+                     firmwareInfo:(NSData *)firmwareInfo
+{
+    if (self = [super init]) {
+        _challenge = challenge;
+        _nonce = nonce;
+        _elements = elements;
+        _elementsSignature = elementsSignature;
+        _dac = dac;
+        _pai = pai;
+        _certificationDeclaration = certificationDeclaration;
+        _firmwareInfo = firmwareInfo;
+    }
+    return self;
+}
+
+@end
+
 @implementation AttestationInfo : NSObject
 
 - (instancetype)initWithChallenge:(NSData *)challenge

src/darwin/Framework/CHIP/MTRCSRInfo.h

@@ -20,9 +20,31 @@
 NS_ASSUME_NONNULL_BEGIN
 
 /**
- * Represents information relating to NOC CSR.
+ * Represents information relating to a certificate signing request for a Matter
+ * operational certificate.  The entire TLV nocsr-elements structure, including
+ * any vendor-specific data, is included, as well as the parsed-out CSR and
+ * CSRNonce fields from that structure.
  *
+ * The AttestationSignature from the CSRResponse command is also included.  This
+ * signs a concatenation of csrElements and the attestationChallenge found in
+ * MTRAttestationInfo.
  */
+MTR_NEWLY_AVAILABLE
+@interface MTROperationalCSRInfo : NSObject
+
+@property (nonatomic, copy, readonly) NSData * csr;
+@property (nonatomic, copy, readonly) NSData * csrNonce;
+@property (nonatomic, copy, readonly) NSData * csrElements;
+@property (nonatomic, copy, readonly) NSData * attestationSignature;
+
+- (instancetype)initWithCSR:(NSData *)csr
+                   csrNonce:(NSData *)csrNonce
+                csrElements:(NSData *)csrElements
+       attestationSignature:(NSData *)attestationSignature;
+
+@end
+
+MTR_NEWLY_DEPRECATED("Please use MTROperationalCSRInfo")
 @interface CSRInfo : NSObject
 
 @property (nonatomic, copy) NSData * nonce;

src/darwin/Framework/CHIP/MTRCSRInfo.mm

@@ -19,6 +19,23 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
+@implementation MTROperationalCSRInfo : NSObject
+
+- (instancetype)initWithCSR:(NSData *)csr
+                   csrNonce:(NSData *)csrNonce
+                csrElements:(NSData *)csrElements
+       attestationSignature:(NSData *)attestationSignature;
+{
+    if (self = [super init]) {
+        _csr = csr;
+        _csrNonce = csrNonce;
+        _csrElements = csrElements;
+        _attestationSignature = attestationSignature;
+    }
+    return self;
+}
+@end
+
 @implementation CSRInfo : NSObject
 
 - (instancetype)initWithNonce:(NSData *)nonce

src/darwin/Framework/CHIP/MTRDeviceController.h

@@ -17,7 +17,7 @@
 
 #import <Foundation/Foundation.h>
 
-#import <Matter/MTRNOCChainIssuer.h>
+#import <Matter/MTROperationalCertificateIssuer.h>
 
 @class MTRBaseDevice;
 
@@ -118,18 +118,33 @@ typedef void (^MTRDeviceConnectionCallback)(MTRBaseDevice * _Nullable device, NS
 - (void)setDeviceControllerDelegate:(id<MTRDeviceControllerDelegate>)delegate queue:(dispatch_queue_t)queue MTR_NEWLY_AVAILABLE;
 
 /**
- * Sets this MTRDeviceController to use the given issuer for issuing operational certs. By default, the MTRDeviceController uses an
- * internal issuer.
+ * Sets this MTRDeviceController to use the given issuer for issuing operational
+ * certificates. By default, the MTRDeviceController uses an internal issuer
+ * using the signing provided when it was created.
  *
- * When a nocChainIssuer is set, the device commissioner will delegate verification to the chip::Credentials::PartialDACVerifier so
- * that DAC chain and CD validation can be performed by custom code triggered by MTRNOCChainIssuer.onNOCChainGenerationNeeded().
- * Otherwise, the device commissioner uses the chip::Credentials::DefaultDACVerifier
+ * Both arguments must be nil (to stop using an external operational certificate
+ * issuer) or both must be non-nil.
  *
- * @param[in] nocChainIssuer the NOC Chain issuer to use for issuer operational certs
+ * When using an external operational certificate issuer, all device attestation
+ * checks that require some sort of trust anchors are delegated to the external
+ * certificate issuer.  Specifically, the following device attestation checks
+ * are not performed and must be done by the operationalCertificateIssuer:
  *
- * @param[in] queue The queue on which the callbacks will be delivered
+ * (1) Make sure the PAA is valid and approved by CSA.
+ * (2) vid-scoped PAA check: if the PAA is vid scoped, then its vid must match the DAC vid.
+ * (3) cert chain check: verify PAI is signed by PAA, and DAC is signed by PAI.
+ * (4) PAA subject key id extraction: the PAA subject key must match the PAA key referenced in the PAI.
+ * (5) CD signature check: make sure a valid CSA CD key is used to sign the CD.
+ *
+ * @param[in] operationalCertificateIssuer the operationalCertificateIssuer to
+ *            use for issuing operational certs
+ *
+ * @param[in] queue The queue on which the calls into the
+ *                  operationalCertificateIssuer will happen.
  */
-- (void)setNocChainIssuer:(id<MTRNOCChainIssuer>)nocChainIssuer queue:(dispatch_queue_t)queue;
+- (BOOL)setOperationalCertificateIssuer:(nullable id<MTROperationalCertificateIssuer>)operationalCertificateIssuer
+                                  queue:(nullable dispatch_queue_t)queue
+                                  error:(NSError * __autoreleasing *)error MTR_NEWLY_AVAILABLE;
 
 /**
  * Return the attestation challenge for the secure session of the device being commissioned.
@@ -221,6 +236,8 @@ typedef void (^MTRDeviceConnectionCallback)(MTRBaseDevice * _Nullable device, NS
 - (void)setPairingDelegate:(id<MTRDevicePairingDelegate>)delegate
                      queue:(dispatch_queue_t)queue MTR_NEWLY_DEPRECATED("Please use setDeviceControllerDelegate:");
 
+- (void)setNocChainIssuer:(id<MTRNOCChainIssuer>)nocChainIssuer
+                    queue:(dispatch_queue_t)queue MTR_NEWLY_DEPRECATED("Please use setOperationalCertificateIssuer");
 @end
 
 NS_ASSUME_NONNULL_END

src/darwin/Framework/CHIP/MTRDeviceController.mm

@@ -114,7 +114,7 @@ - (instancetype)initWithFactory:(MTRDeviceControllerFactory *)factory queue:(dis
             return nil;
         }
 
-        _operationalCredentialsDelegate = new MTROperationalCredentialsDelegate();
+        _operationalCredentialsDelegate = new MTROperationalCredentialsDelegate(self);
         if ([self checkForInitError:(_operationalCredentialsDelegate != nullptr) logMsg:kErrorOperationalCredentialsInit]) {
             return nil;
         }
@@ -548,20 +548,33 @@ - (void)setDeviceControllerDelegate:(id<MTRDeviceControllerDelegate>)delegate qu
     });
 }
 
-- (void)setNocChainIssuer:(id<MTRNOCChainIssuer>)nocChainIssuer queue:(dispatch_queue_t)queue
+- (BOOL)setOperationalCertificateIssuer:(nullable id<MTROperationalCertificateIssuer>)operationalCertificateIssuer
+                                  queue:(nullable dispatch_queue_t)queue
+                                  error:(NSError * __autoreleasing *)error
 {
-    VerifyOrReturn([self checkIsRunning]);
+    if ((operationalCertificateIssuer != nil && queue == nil) || (operationalCertificateIssuer == nil && queue != nil)) {
+        if (error) {
+            *error = [MTRError errorForCHIPErrorCode:CHIP_ERROR_INVALID_ARGUMENT];
+        }
+        return NO;
+    }
+
+    VerifyOrReturnValue([self checkIsRunning:error], NO);
 
+    __block BOOL success = NO;
     dispatch_sync(_chipWorkQueue, ^{
-        VerifyOrReturn([self checkIsRunning]);
+        VerifyOrReturn([self checkIsRunning:error]);
 
-        if (nocChainIssuer != nil) {
-            self->_operationalCredentialsDelegate->SetNocChainIssuer(nocChainIssuer, queue);
+        if (operationalCertificateIssuer != nil) {
+            self->_operationalCredentialsDelegate->SetOperationalCertificateIssuer(operationalCertificateIssuer, queue);
             self->_cppCommissioner->SetDeviceAttestationVerifier(_partialDACVerifier);
         } else {
             self->_cppCommissioner->SetDeviceAttestationVerifier(chip::Credentials::GetDeviceAttestationVerifier());
         }
+        success = YES;
     });
+
+    return success;
 }
 
 + (nullable NSData *)computePASEVerifierForSetupPasscode:(NSNumber *)setupPasscode
@@ -882,6 +895,59 @@ - (void)onPairingDeleted:(NSError * _Nullable)error
 
 @end
 
+/**
+ * Shim to allow us to treat an MTRNOCChainIssuer as an
+ * MTROperationalCertificateIssuer.
+ */
+@interface MTROperationalCertificateChainIssuerShim : NSObject <MTROperationalCertificateIssuer>
+@property (nonatomic, readonly) id<MTRNOCChainIssuer> nocChainIssuer;
+- (instancetype)initWithIssuer:(id<MTRNOCChainIssuer>)nocChainIssuer;
+@end
+
+@implementation MTROperationalCertificateChainIssuerShim
+- (instancetype)initWithIssuer:(id<MTRNOCChainIssuer>)nocChainIssuer
+{
+    if (self = [super init]) {
+        _nocChainIssuer = nocChainIssuer;
+    }
+    return self;
+}
+
+- (void)issueOperationalCertificateForRequest:(MTROperationalCSRInfo *)csrInfo
+                              attestationInfo:(MTRAttestationInfo *)attestationInfo
+                                   controller:(MTRDeviceController *)controller
+                                   completion:(MTROperationalCertificateIssuedHandler)completion
+{
+    CSRInfo * oldCSRInfo = [[CSRInfo alloc] initWithNonce:csrInfo.csrNonce
+                                                 elements:csrInfo.csrElements
+                                        elementsSignature:csrInfo.attestationSignature
+                                                      csr:csrInfo.csr];
+    AttestationInfo * oldAttestationInfo = [[AttestationInfo alloc] initWithChallenge:attestationInfo.challenge
+                                                                                nonce:attestationInfo.nonce
+                                                                             elements:attestationInfo.elements
+                                                                    elementsSignature:attestationInfo.elementsSignature
+                                                                                  dac:attestationInfo.dac
+                                                                                  pai:attestationInfo.pai
+                                                             certificationDeclaration:attestationInfo.certificationDeclaration
+                                                                         firmwareInfo:attestationInfo.firmwareInfo];
+    [self.nocChainIssuer
+          onNOCChainGenerationNeeded:oldCSRInfo
+                     attestationInfo:oldAttestationInfo
+        onNOCChainGenerationComplete:^(NSData * operationalCertificate, NSData * intermediateCertificate, NSData * rootCertificate,
+            NSData * _Nullable ipk, NSNumber * _Nullable adminSubject, NSError * __autoreleasing * error) {
+            auto * info = [MTROperationalCertificateInfo infoWithOperationalCertificate:operationalCertificate
+                                                                intermediateCertificate:intermediateCertificate
+                                                                        rootCertificate:rootCertificate
+                                                                           adminSubject:adminSubject];
+            completion(info, nil);
+            if (error != nil) {
+                *error = nil;
+            }
+        }];
+}
+
+@end
+
 @implementation MTRDeviceController (Deprecated)
 
 - (NSNumber *)controllerNodeId
@@ -1105,4 +1171,10 @@ - (void)setPairingDelegate:(id<MTRDevicePairingDelegate>)delegate queue:(dispatc
     [self setDeviceControllerDelegate:delegateShim queue:queue];
 }
 
+- (void)setNocChainIssuer:(id<MTRNOCChainIssuer>)nocChainIssuer queue:(dispatch_queue_t)queue
+{
+    [self setOperationalCertificateIssuer:[[MTROperationalCertificateChainIssuerShim alloc] initWithIssuer:nocChainIssuer]
+                                    queue:queue
+                                    error:nil];
+}
 @end