KMS Keyring #86

MatthewBennington · 2019-11-15T22:08:51Z

Issue #, if available: #66

Description of changes: Implemented KMS Keyring. In addation to the Keyring file, the files KMSUtils.dfy and KMS.cs were added. The buildspec.yml was edited to execute mono build/Main.exe, this should give us some semblance of a integration test.

Note: To run Main.exe after these changes, you must have AWS credentials configured in your environment with sufficient permissions to to call: KMS:GenerateDataKey, KMS:Encrypt, and KMS:Decrypt.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

… into KMSKeyring

A build command isn't the right place to attempt to run integration tests. Ideally we will run something similar in the future, but not until #54 is figured out.

MatthewBennington · 2019-11-15T22:58:39Z

After some investigation, I don't think there is a way to run such integration tests intelligently without creating a new testing approach. I've removed the line from buildspec.yml.

robin-aws

Nice work in getting all this to verify, and even better to have the end-to-end encrypt/decrypt test work!

robin-aws · 2019-11-18T18:24:26Z

Makefile

@@ -46,7 +48,10 @@ DEPS_CS = $(wildcard src/extern/dotnet/*.cs)

 BCDLL = lib/BouncyCastle.1.8.5/lib/BouncyCastle.Crypto.dll

-DEPS = $(DEPS_CS) $(BCDLL)
+AWSDLLS = lib/AWSSDK.KeyManagementService.3.3.101.83/lib/net45/AWSSDK.KeyManagementService.dll \
+		  lib/AWSSDK.Core.3.3.103.62/lib/net45/AWSSDK.Core.dll


Side-note I don't expect you to address in this PR, but I don't want to leave much longer: I'm starting to really hate all the hard-coded, manually-managed dependency references. We need to leverage nuget here somehow.

robin-aws · 2019-11-18T18:26:00Z

src/SDK/CMM/DefaultCMM.dfy

@@ -115,7 +115,7 @@ module DefaultCMMDef {

      var dm :- kr.OnDecrypt(alg_id, enc_ctx, edks);
      if dm.None? {
-        return Failure("Could not get materials required for decryption.");
+        return Failure("Keyring.OnDecrypt did not return a value.");


Interesting, why do you prefer this version?

When debugging, I found it helpful to not have duplicate error messages (there's an identical one on line 109), so I made this one more specific.

I smell a missing error enum. ;)

Can of worms territory here :) See #32

robin-aws · 2019-11-18T18:35:31Z

src/SDK/Keyring/KMSKeyring.dfy

+      |keyIDs| == 0 && generator.None? ==> isDiscovery
+    }
+
+    constructor(clientSupplier: string -> KMSUtils.KMSClient, keyIDs: seq<string>, generator: Option<string>, grantTokens: seq<string>)


We definitely need to document the strings the supplier will be passed - It should be public region names, right? It might even be worth defining a type alias for string or string -> KMSUtils.KMSClient

Also, perhaps generatorKeyID instead of generator?

Good point, could we get away with `region in ["us-east-1", "us-west-2"...]?

I wouldn't try to enumerate the regions anywhere in Dafny code. We definitely want to leave that up to the AWS libraries to manage.

src/SDK/Keyring/RawAESKeyring.dfy

src/Main.dfy

src/SDK/Keyring/KMSKeyring.dfy

robin-aws · 2019-11-18T20:56:31Z

src/KMS/KMSUtils.dfy

+
+  datatype GenerateDataKeyResponse = GenerateDataKeyResponse(ciphertextBlob: seq<uint8>, contentLength: int, httpStatusCode: HttpStatusCode, keyID: string, plaintext: seq<uint8>, responseMetadata: ResponseMetadata)
+  {
+    predicate method IsWellFormed() {


Any reason not to call this Valid() instead?

IsWellFormed makes more sense to me since it's not checking if these datatypes are in a valid state. Rather we are checking if they are in the shape we want them to be in. That's just a feeling for me though, Valid() may make more sense.

If we expect every GenerateDataKeyResponse value that we ever produce to satisfy these conditions, then I think Valid() is an appropriate name. If we expect to be passing around some GenerateDataKeyResponse values that don't satisfy these conditions, then a different name, like IsWellFormed(), seems good.

f we expect every GenerateDataKeyResponse value that we ever produce to satisfy these conditions, then I think Valid() is an appropriate name.

This structure is the result of a network call, so I am not inclined to believe anything about it for sure.

Agreed with that, and I fully expect you to explicitly test Valid(). I don't think there's a huge distinction between other code that can't statically guarantee the value is valid (especially since we're going to have external code in the shim like that) and code that happens to be deserializing a web service response.

There are two different things that we might be concerned about regarding what the KMS reponse contains:

Things the API promises (according to aws documentation: https://docs.aws.amazon.com/kms/latest/APIReference/API_GenerateDataKey.html):

1 <= |ciphertextBlob| <= 6144

1 <= |keyID| <= 2048

1 <= |plaintext| <= 4096

Things that we require of the response otherwise we can't continue:

keyID is ASCII characters

|keyID| < UINT16_LIMIT

|ciphertextBlob| < UINT16_LIMIT

I'm currently having a hard time deciding whether either set of restrictions should be called "valid" or "wellformed" or something else. However, I do think that the former is something we should be able to assume about the response, and the latter is something that we need to check at runtime and fail if the conditions are not met.

1 <= |ciphertextBlob| <= 6144

NP: That's the length of the base64 encoded ciphertext. We're dealing with bytes.

I think a base64 string of length 6144 translates to 4608 bytes, but I'd really like someone to confirm my math, because that seems odd.

I think a base64 string of length 6144 translates to 4608 bytes, but I'd really like someone to confirm my math, because that seems odd.

I'd strongly suggest you actually define a function for that math if it shows up in the requirements, so that you can state something like 1 <= |ciphertextBlob| <= Base64Length(4608)

How should the ESDK respond is the case where a response is within the bounds of the ESDK specification, but violates the restrictions in the KMS API reference?

i.e. KMS.Encrypt returns a ciphertext of length greater than Base64Length(6144)?

src/SDK/Keyring/KMSKeyring.dfy

src/extern/dotnet/KMS.cs

src/SDK/Keyring/KMSKeyring.dfy

MatthewBennington · 2019-11-19T18:31:15Z

Note: The latest build failure is expected, and due to lack of IAM policy allowing KMS calls.

RustanLeino

Removing the assume and considering an alternate version of StringFind are my main comments.

src/KMS/KMSUtils.dfy

RustanLeino · 2019-11-21T20:09:41Z

src/KMS/KMSUtils.dfy

+
+  datatype GenerateDataKeyResponse = GenerateDataKeyResponse(ciphertextBlob: seq<uint8>, contentLength: int, httpStatusCode: HttpStatusCode, keyID: string, plaintext: seq<uint8>, responseMetadata: ResponseMetadata)
+  {
+    predicate method IsWellFormed() {


If we expect every GenerateDataKeyResponse value that we ever produce to satisfy these conditions, then I think Valid() is an appropriate name. If we expect to be passing around some GenerateDataKeyResponse values that don't satisfy these conditions, then a different name, like IsWellFormed(), seems good.

src/SDK/Keyring/KMSKeyring.dfy

RustanLeino · 2019-11-21T20:22:45Z

src/extern/dotnet/KMS.cs

+                    new ArrayDString(response.KeyId.ToCharArray()),
+                    new Arraybyteseq(response.Plaintext.ToArray()),
+                    __default.ConvertMetaData(response.ResponseMetadata)
+                    ));


I've done both, so I'm afraid I'm no help to this discussion.

RustanLeino · 2019-11-21T20:23:53Z

src/extern/dotnet/KMS.cs

+        public STL.Result<GenerateDataKeyResponse> GenerateDataKey(GenerateDataKeyRequest request) {
+            try {
+            KMS.Model.GenerateDataKeyRequest kmsRequest = new KMS.Model.GenerateDataKeyRequest()
+            {


My preference would be to put this { at the end of the previous line, since it goes with the new that's on that line.

test/KMS/Integration.dfy

lavaleri · 2019-11-22T16:26:27Z

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lavaleri · 2019-11-22T00:23:10Z

src/extern/dotnet/KMS.cs

+                    new ArrayDString(response.KeyId.ToCharArray()),
+                    new Arraybyteseq(response.Plaintext.ToArray()),
+                    __default.ConvertMetaData(response.ResponseMetadata)
+                    ));


I don't see a practicle value for one over the over, but aesthetically I prefer the close parens on the previous line. Is there a widely used linter for C# we could use?

src/KMS/KMSUtils.dfy

lavaleri · 2019-11-22T21:13:55Z

src/extern/dotnet/KMS.cs

+                } else {
+                    return new STL.Result_Failure<KMSClient>(new ArrayDString("Client Supplier does not have default region.".ToCharArray()));
+                }
+            } catch (System.Exception exception) {


Maybe I'm unfamiliar with C# idioms, but we should probably be more specific than System.Exception. What exceptions are we looking to catch here?

This is the pattern we're following in most of the extern files. Yes, I would be surprised if it were inline with c# idioms. I think this connects to #32, and how we plan on handling exceptions.

In this specific case, none of the methods called are documented to throw exceptions. But other methods seems to throw undocumented exceptions, so I aired on the side of caution.

Depending on what direction we want to go until #32 is resolved, it may make the most sense to remove this try block.

Yes, at a bare minimum we should be catching all "non-fatal" exceptions so they don't short-circuit the entire Dafny runtime, as part of the "FFI". As long as System.Exception is correct and doesn't include out-of-memory exceptions, this is fine for now. Agreed that once we have a way to distinguish different types of exceptions we'll want to handle them more specifically.

lavaleri · 2019-11-22T21:16:36Z

src/extern/dotnet/KMS.cs

+            try {
+                if (region.is_Some) {
+                    DString neverUsed = new ArrayDString("".ToCharArray());
+                    return new STL.Result_Success<KMSClient>(new KMSClient(new KMS.AmazonKeyManagementServiceClient(RegionEndpoint.GetBySystemName(region.GetOrElse(neverUsed).ToString()))));


Why are we doing a GetOrElse here if we know region is populated by this point?

As far as I can tell, there is no other way to get the value from an option in c#.

test/KMS/KMSKeyring.dfy

lavaleri · 2019-11-22T21:27:43Z

test/KMS/KMSKeyring.dfy

@@ -0,0 +1,85 @@
+// RUN: %dafny /out:Output/KMSKeyring.exe "./KMSKeyring.dfy" ../../src/extern/dotnet/KMS.cs ../../src/extern/dotnet/UTF8.cs "%kmslib" "%awslib" /compile:2


Because this file is testing logic in KMSKeyring it should be named test/Keyring/KMSKeyring.dfy.

We should also include tests that exercise the extern code.

We should also include tests that exercise the extern code.

I agree (I think there are a couple of comments saying this). Before we do that though, I think we need to think about what testing looks like.

This comes back to our ongoing discussions about what the test suite for this project looks like. I think we need to reach a decision on that before starting to write C# tests.

This is problematic, since I'm worried that the C# utility methods included in this C# are a potential weak link, as they are doing fairly complex things, and not exposed to and form of verification.

You should be able to use NUnit for the C# code AFAICT, once I get my .csproj/.sln files committed so that NUnit can resolve all the dependencies. If that doesn't happen in time I think it would be reasonable to cut a follow-up issue to backfill the unit tests.

test/KMS/KMSKeyring.dfy

RustanLeino · 2019-11-23T01:52:50Z

In the extern C# files, don't call the constructor ArraySequence directly. Instead, use the Sequence.FromArray factory method. See #90

lavaleri · 2019-11-25T22:30:32Z

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MatthewBennington · 2019-11-25T23:51:40Z

Note:

Right now the build checks are failing due to a timeout in Main.dfy. Something is getting stuck in KMSUtils.ValidFormatCMK(), I'm trying to track down the issue now.

If the ValidFormatCMK() subset constraint on KMSUtils.CustomerMasterKey is removed, then this revision verifies, builds, and passes tests on my local machine.

lavaleri · 2019-11-25T23:57:54Z

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… into KMSKeyring

lavaleri · 2019-12-04T20:44:10Z

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… into KMSKeyring

lavaleri · 2019-12-06T17:50:22Z

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src/KMS/KMSUtils.dfy

src/Main.dfy

src/SDK/Keyring/KMSKeyring.dfy

lavaleri · 2019-12-06T18:59:35Z

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lavaleri · 2019-12-06T19:08:43Z

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lavaleri

One last nitpick, otherwise LGTM.

src/Main.dfy

lavaleri · 2019-12-06T20:00:37Z

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robin-aws

Looks great! Just some minor quibbles to address first.

robin-aws · 2019-12-06T23:40:27Z

Makefile

 	lit test -q -v

+clean-test:


YAY, thank you. :)

I need to add somewhere that we need to call this after #101 is merged to clean up the random .cs files.

robin-aws · 2019-12-06T23:59:15Z

src/Main.dfy

@@ -65,8 +65,14 @@ module Main {
      return;
    }

-    var ek, dk := RSAEncryption.RSA.RSAKeygen(2048, RSAEncryption.PKCS1);
-    var keyring := new RawRSAKeyringDef.RawRSAKeyring(namespace.value, name.value, RSAEncryption.RSAPaddingMode.PKCS1, 2048, Some(ek), Some(dk));
+    var generatorStr := "arn:aws:kms:us-west-2:658956600833:key/b3537ef1-d8dc-4780-9f5a-55776cbb2f7f";


Can we not do this since you've got a separate integration test now? I've already relocated the current version of this as test/Client.dfy in #101 :)

src/StandardLibrary/StandardLibrary.dfy

src/KMS/KMSUtils.dfy

robin-aws · 2019-12-09T17:15:29Z

src/KMS/KMSUtils.dfy

+
+  datatype GenerateDataKeyResponse = GenerateDataKeyResponse(ciphertextBlob: seq<uint8>, contentLength: int, httpStatusCode: HttpStatusCode, keyID: string, plaintext: seq<uint8>, responseMetadata: ResponseMetadata)
+  {
+    predicate method IsWellFormed() {


I think a base64 string of length 6144 translates to 4608 bytes, but I'd really like someone to confirm my math, because that seems odd.

I'd strongly suggest you actually define a function for that math if it shows up in the requirements, so that you can state something like 1 <= |ciphertextBlob| <= Base64Length(4608)

robin-aws · 2019-12-09T17:19:20Z

src/SDK/Keyring/KMSKeyring.dfy

+      if !generatorResponse.IsWellFormed() {
+        return Failure("Invalid response from KMS GenerateDataKey");
+      }


Idle thought: I'm thinking once #101 is in we can go with this idiom for all these dynamic checks:

var _ :- Require(generatorResponse.IsWellFormed(), "Invalid response from KMS GenerateDataKey");

Besides tightening up the code, I'm hoping it will push us towards better error handling in general, possibly being able to chain failures better - it might make sense to make Require a built-in mechanism closer to requires at some point.

src/StandardLibrary/StandardLibrary.dfy

robin-aws · 2019-12-09T17:23:28Z

src/extern/dotnet/KMS.cs

+                } else {
+                    return new STL.Result_Failure<KMSClient>(new ArrayDString("Client Supplier does not have default region.".ToCharArray()));
+                }
+            } catch (System.Exception exception) {


Yes, at a bare minimum we should be catching all "non-fatal" exceptions so they don't short-circuit the entire Dafny runtime, as part of the "FFI". As long as System.Exception is correct and doesn't include out-of-memory exceptions, this is fine for now. Agreed that once we have a way to distinguish different types of exceptions we'll want to handle them more specifically.

lavaleri · 2019-12-09T19:10:37Z

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lavaleri · 2019-12-09T22:20:38Z

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This reverts commit ba72302.

This reverts commit c3e80bc.

lavaleri · 2019-12-09T23:07:46Z

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robin-aws · 2019-12-09T23:32:29Z

src/StandardLibrary/StandardLibrary.dfy

@@ -48,6 +48,11 @@ module {:extern "STL"} StandardLibrary {
    }
  }

+  function method Base64LengthToByteLength(len: nat): nat {
+    // This function does NOT account for padding characters.


Doesn't it need to for correctness though?

This method purely converts a nat representing a base64 length, to a nat representing byte length. There's no way for it to account for padding. That comment is meant to indicate that it shouldn't be called as Base64LengthToByteLength(|base64str|), as in that case there may be padding characters.

You're right.

As discussed offline, we can cut an issue for this after merging

MatthewBennington added 4 commits November 12, 2019 15:53

Adding KMSKeyring as well as supporting util/extern code.

483ce6f

Merge branch 'develop' of github.com:awslabs/aws-encryption-sdk-dafny…

68dfbec

… into KMSKeyring

Merge branch 'develop' of github.com:awslabs/aws-encryption-sdk-dafny…

f4026c5

… into KMSKeyring

KMS keyring added to Main.dfy, fixes to error handling, and PR cleanup

788f9ff

MatthewBennington requested review from RustanLeino, robin-aws and lavaleri November 15, 2019 22:08

Remove mono build/Main.exe from buildscript.

504b5e3

A build command isn't the right place to attempt to run integration tests. Ideally we will run something similar in the future, but not until #54 is figured out.

robin-aws requested changes Nov 18, 2019

View reviewed changes

MatthewBennington added 2 commits November 19, 2019 09:43

PR comment fixes, and Integration test

f32f2ec

Print error on KMS integration test failure

5ee34b3

MatthewBennington requested a review from seebees November 19, 2019 22:57

Add region parsing tests, and cut down on C# code duplication

d99e442

RustanLeino previously approved these changes Nov 21, 2019

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Add timeout to Makefile

f832f9d

MatthewBennington dismissed RustanLeino’s stale review via f832f9d November 21, 2019 23:07

Fix printing on KMS Integration test failure

da11863

lavaleri suggested changes Nov 22, 2019

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Streamline ARN parsing with Split() function

e1ebd37

misc PR comments, and move CMK + Grant Tokens to subtypes

8fe9c2f

Call Sequence factory methods in KMS.cs

7e1c8cf

MatthewBennington added 2 commits December 2, 2019 16:18

Remove predicate restricing CustomerMasterKey subtype

035635b

Merge branch 'develop' of github.com:awslabs/aws-encryption-sdk-dafny…

d6fc884

… into KMSKeyring

Merge branch 'develop' of github.com:awslabs/aws-encryption-sdk-dafny…

631d828

… into KMSKeyring

lavaleri suggested changes Dec 6, 2019

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Merge branch 'develop' into KMSKeyring

0e8d605

Addressing PR comments

58d109c

lavaleri previously approved these changes Dec 6, 2019

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src/Main.dfy Outdated Show resolved Hide resolved

Minor PR fix: move lines in main out of else block

f225169

MatthewBennington dismissed lavaleri’s stale review via f225169 December 6, 2019 19:51

lavaleri previously approved these changes Dec 6, 2019

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robin-aws requested changes Dec 9, 2019

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MatthewBennington added 4 commits December 9, 2019 10:09

removing broken commented code

d8086a2

Improve Find/Split lemma names

fe140d6

Very minor whitespace fix

df6e499

Refine error handling in KMS.cs

353c1ad

MatthewBennington dismissed lavaleri’s stale review via 353c1ad December 9, 2019 19:03

MatthewBennington added 2 commits December 9, 2019 14:16

Strengthening KMS request/response predicates

c3e80bc

Remove Main.dfy

ba72302

MatthewBennington added 3 commits December 9, 2019 14:45

Revert "Remove Main.dfy"

b02e2b5

This reverts commit ba72302.

Revert "Strengthening KMS request/response predicates"

e0f8e4b

This reverts commit c3e80bc.

Reverting Main.dfy to upstream/develop

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robin-aws reviewed Dec 9, 2019

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robin-aws approved these changes Dec 10, 2019

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MatthewBennington merged commit 1a6ab44 into aws:develop Dec 10, 2019

		@@ -0,0 +1,85 @@
		// RUN: %dafny /out:Output/KMSKeyring.exe "./KMSKeyring.dfy" ../../src/extern/dotnet/KMS.cs ../../src/extern/dotnet/UTF8.cs "%kmslib" "%awslib" /compile:2

KMS Keyring #86

KMS Keyring #86

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MatthewBennington commented Nov 19, 2019

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lavaleri commented Nov 22, 2019

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MatthewBennington commented Nov 15, 2019 •

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