core: Spiffe Utils #11522

erm-g · 2024-09-13T03:28:06Z

No description provided.

matthewstevenson88

Thanks for putting this together @erm-g! I took an initial pass and left some comments. Please give me a ping when it's ready for another look. :)

matthewstevenson88 · 2024-09-13T04:47:16Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+    checkArgument(checkNotNull(certChain, "certChain").length > 0, "CertChain can't be empty");
+    Collection<List<?>> subjectAltNames = certChain[0].getSubjectAlternativeNames();
+    if (subjectAltNames != null) {
+      for (List<?> altName : subjectAltNames) {


Please ensure that there is a unique URI SAN.

Ok to resolve

matthewstevenson88 · 2024-09-13T04:47:24Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+
+  private SpiffeUtil() {}
+
+  public static Optional<SpiffeId> extractSpiffeId(X509Certificate[] certChain)


Please add a Javadoc.

Ok to resolve

matthewstevenson88 · 2024-09-13T04:47:36Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+  private static final Integer URI_SAN_TYPE = 6;
+  private static final String USE_PARAMETER_VALUE = "x509-svid";
+
+  private SpiffeUtil() {}


nit: Please move to the bottom of the class.

Dropped it completely, similar to #11490 (comment)

Ok to resolve

matthewstevenson88 · 2024-09-13T04:48:05Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+
+  public static class TrustBundle {
+
+    private final Map<String, Long> sequenceNumbers;


What are the sequence numbers? Could you explain why they're relevant here?

In short it's a number that indicates the bundle version for a particular TB, however it's not mandatory -
https://github.com/spiffe/spiffe/blob/main/standards/SPIFFE_Trust_Domain_and_Bundle.md#411-sequence-number

Thanks for explaining. Are we going to use the sequence numbers for anything? If not, should we drop them?

IIUC the ideas behind the spec, we can use it for logging (because it indicates a kind of version of that particular TD entry in the file) but I don't think we'll be making any decisions based on these numbers (like 'Hey let's reject this entry because current sequence number is less than the previous one).

Thanks for the context. If they're optional and we don't need to use them for anything, can we omit them to simplify the code?

matthewstevenson88 · 2024-09-13T04:48:16Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+    }
+  }
+
+  public static class TrustBundle {


Please add a Javadoc for this class and its methods.

OK to resolve

matthewstevenson88 · 2024-09-13T04:50:35Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+      for (Map<String, ?> keyNode : keysNode) {
+        String kid = JsonUtil.getString(keyNode, "kid");
+        if (kid != null && !kid.equals("")) {
+          log.log(Level.SEVERE, String.format("'kid' parameter must not be set but value '%s' "


Here and throughout this method: since this is a library, should we throw an exception rather than logging?

We still need to construct a map even if we can't process some of the entries, i.e json like

domain: google.com cert:correctBytes domain: google.com.test cert:corruptedBytes

should still produce a valid entry for google.com. WDYT?

Ah I see, good question. I was thinking that we should be strict for the start and fail if anything is malformed and, if we need to change in the future, we can do so without breaking users. However, if we start off allowing malformed entries, then we can't disallow them in the future without a breaking change. WDYT?

Ah, ok, we made a similar decision for CRL (a bad/corrupted entry doesn't influence loading other entries - https://github.com/grpc/proposal/pull/382/files#diff-42c23f30b346a23a489989e1fcd1cd3773f62208c99d36b9a246005b2395aa6aR107)
In SPIIFE case it's very similar reasoning - imagine a situation when there is a bunch of providers of trust domains data, who sends the info to distributor. Distributor only merges the stuff together to create the resulting json file and then sends it to the machines. In that case, a mistake by single TD provider crashes all the others.

matthewstevenson88 · 2024-09-13T04:50:56Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+
+    private final Map<String, Long> sequenceNumbers;
+
+    private final Map<String, List<X509Certificate>> trustBundleMap;


nit: Prefer ImmutableMap and ImmutableList.

Ok to resolve.

matthewstevenson88 · 2024-09-13T04:54:44Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+    return Optional.absent();
+  }
+
+  public static TrustBundle loadTrustBundleFromFile(String trustBundleFile) throws IOException {


Could you point me to the spec you're using as a reference for this method?

https://github.com/spiffe/spiffe/blob/main/standards/SPIFFE_Trust_Domain_and_Bundle.md

Thanks! What's confusing me is the following - the code and the examples seem to suggest that the file has the following format:

{ "trust_domains": { "trust_domain": { // JWK set } } }

But the spec only seems to talk about the structure of the JWK set. Where is the rest of the structure specified?

Apologies in advance if I'm missing something obvious. :)

Not sure if I got your question - IIUC it's just spread across that md. For example, use and 'kid' parameter - https://github.com/spiffe/spiffe/blob/main/standards/X509-SVID.md#61-publishing-spiffe-bundle-elements

Resolved in offline discussion, feel free to resolve.

matthewstevenson88 · 2024-09-13T04:54:55Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+    for (String trustDomainName : trustDomainsNode.keySet()) {
+      Map<String, ?> domainNode = JsonUtil.getObject(trustDomainsNode, trustDomainName);
+      if (domainNode == null || domainNode.size() == 0) {
+        trustBundleMap.put(trustDomainName, Collections.emptyList());


Is this allowed?

From connection status perspective it's the same. However, from monitoring/debugging perspective I think it's useful to differentiate between 'Hey, the file we loaded doesn't contain the domain' and 'Hey, the the domain doesn't have the correct root to validate this conn'.
WDYT?

Makes sense. I'm surprised that the spec allows an empty key or empty value, but agree with you that it doesn't matter from an authentication point of view.

Ok to resolve.

matthewstevenson88 · 2024-09-13T04:55:33Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+              trustDomainName));
+          break;
+        }
+        String rawCert = JsonUtil.getString(keyNode, "x5c");


Is this DER-encoded or PEM-encoded?

https://github.com/spiffe/spiffe/blob/main/standards/SPIFFE_Trust_Domain_and_Bundle.md#appendix-a-spiffe-bundle-example suggests the former, but all of our discussions have been slanted to the latter.

Ok to resolve.

…methods

matthewstevenson88 · 2024-09-20T03:29:35Z

core/src/main/java/io/grpc/internal/SpiffeUtil2.java

+    if (subjectAltNames != null) {
+      boolean spiffeFound = false;
+      for (List<?> altName : subjectAltNames) {
+        if (URI_SAN_TYPE.equals(altName.get(0))) {


nit: Should we check that altName.length > 0?

That's a good catch - the JDK I have actually defines these altNames as ArrayList(2), but there is no guarantee other JDKs have the same impl details. Added 2 checks.

Ok to resolve.

matthewstevenson88 · 2024-09-20T03:34:41Z

core/src/main/java/io/grpc/internal/SpiffeUtil2.java

+      throws CertificateParsingException {
+    checkArgument(checkNotNull(certChain, "certChain").length > 0, "CertChain can't be empty");
+    Collection<List<?>> subjectAltNames = certChain[0].getSubjectAlternativeNames();
+    if (subjectAltNames != null) {


Readability suggestion: To minimize nesting, consider returning early here, e.g.

if (subjectAltNames == null) { return Optional.absent(); }

Not sure about this - if I do it, then I'll need an extra check for the last loop
if no spiffe, then return Optional.absent()
Let's ask Eric?

Changed as discussed offline

Ok to resolve.

matthewstevenson88 · 2024-09-20T03:37:03Z

core/src/main/java/io/grpc/internal/SpiffeUtil2.java

+    checkArgument(checkNotNull(certChain, "certChain").length > 0, "CertChain can't be empty");
+    Collection<List<?>> subjectAltNames = certChain[0].getSubjectAlternativeNames();
+    if (subjectAltNames != null) {
+      boolean spiffeFound = false;


WDYT of storing the SPIFFE ID instead of a boolean, so we don't need to iterate over the list twice?

For example,

Optional<String> uriSan = Optional.absent(); for (List<?> altName : subjectAltNames) { if (altName.length > 0 && altName.get(0).equals(URI_SAN_TYPE) { if (uriSan.absent()) { uriSan = Optional.of(altName.get(0)); } else { throw exception } } }

If you add SPIFFE parsing logic to the same loop, then the following might occur:

SPIFFE found

SPIFFE parsing failed

Exception about SPIFFE parsing thrown
But if there is another SPIFFE, then we want to throw Duplicate SPIFFE exception, but not the parsing one.

So the second loop is needed for your approach as well (if we store it in the first loop, we still need to iterate over collection one more time to 're-find '), unless we want to play with indices.

What I like about the current approach is the readability - it clearly follows the spec

check if there are duplicates

if none, do the parsing

WDYT?

Changed as discussed offline

Ok to resolve.

matthewstevenson88 · 2024-09-20T03:39:34Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+
+  public static class TrustBundle {
+
+    private final Map<String, Long> sequenceNumbers;


Thanks for explaining. Are we going to use the sequence numbers for anything? If not, should we drop them?

matthewstevenson88 · 2024-09-20T04:06:28Z

core/src/main/java/io/grpc/internal/SpiffeUtil2.java

+  private static final String USE_PARAMETER_VALUE = "x509-svid";
+
+  /**
+   * Parses a leaf certificate from the chain to extract unique SPIFFE ID. In case of success,


Suggested edit: "Returns the SPIFFE ID from the leaf certificate, if present."

I'm on the fence here - a reader already sees that the method returns Optional<SpiffeId>, so my intent here is to provide a little bit more details about what we;re returning.
WDYT?

Changed as discussed offline

matthewstevenson88 · 2024-09-20T04:09:02Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+    for (String trustDomainName : trustDomainsNode.keySet()) {
+      Map<String, ?> domainNode = JsonUtil.getObject(trustDomainsNode, trustDomainName);
+      if (domainNode == null || domainNode.size() == 0) {
+        trustBundleMap.put(trustDomainName, Collections.emptyList());


Makes sense. I'm surprised that the spec allows an empty key or empty value, but agree with you that it doesn't matter from an authentication point of view.

matthewstevenson88 · 2024-09-20T04:17:45Z

core/src/test/resources/io/grpc/internal/spiffebundle.json

+          "e": "AQAB"
+        },
+        {
+          "kty": "RSA",


Should we add the x5c key so that we can confirm in our tests that multiple certs for the same trust domain get properly captured in the spiffe bundle?

matthewstevenson88 · 2024-09-20T04:23:06Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+      for (Map<String, ?> keyNode : keysNode) {
+        String kid = JsonUtil.getString(keyNode, "kid");
+        if (kid != null && !kid.equals("")) {
+          log.log(Level.SEVERE, String.format("'kid' parameter must not be set but value '%s' "


Ah I see, good question. I was thinking that we should be strict for the start and fail if anything is malformed and, if we need to change in the future, we can do so without breaking users. However, if we start off allowing malformed entries, then we can't disallow them in the future without a breaking change. WDYT?

matthewstevenson88 · 2024-09-20T04:24:20Z

core/src/main/java/io/grpc/internal/SpiffeUtil2.java

+      try {
+        Collection<? extends Certificate> certs = CertificateFactory.getInstance("X509")
+            .generateCertificates(stream);
+        if (certs.size() > 0) {


Could this be > 1? If yes, should we take those into account? What does the spec say about this case?

Yes, it can be >1 (it's not an exception). IIUC we can simply ignore it - https://datatracker.ietf.org/doc/html/rfc7517#section-4.7
WDYT?

Taking back my previous comment - it must be exactly one
Changed accordingly

matthewstevenson88 · 2024-09-20T04:27:31Z

core/src/main/java/io/grpc/internal/SpiffeUtil2.java

+      String trustDomainName) {
+    List<X509Certificate> result = new ArrayList<>();
+    for (Map<String, ?> keyNode : keysNode) {
+      String kid = JsonUtil.getString(keyNode, "kid");


optional: To make the code more readable, consider moving the checks on the "kid" and "use" claims into a helper function.

matthewstevenson88 · 2024-09-26T18:42:52Z

core/src/main/java/io/grpc/internal/SpiffeUtil2.java

+      return Optional.absent();
+    }
+    String uri = null;
+    for (List<?> altName : subjectAltNames) {


Please add a comment before this for loop to add some explanation, e.g. "Search for the unique URI SAN."

matthewstevenson88 · 2024-09-26T18:49:30Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+
+  public static class TrustBundle {
+
+    private final Map<String, Long> sequenceNumbers;


Thanks for the context. If they're optional and we don't need to use them for anything, can we omit them to simplify the code?

matthewstevenson88 · 2024-09-26T18:49:49Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+    }
+  }
+
+  public static class TrustBundle {


OK to resolve

matthewstevenson88 · 2024-09-26T18:49:57Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+    }
+  }
+
+  public static class TrustBundle {


OK to resolve

matthewstevenson88 · 2024-09-26T18:50:50Z

core/src/main/java/io/grpc/internal/SpiffeUtil2.java

+
+    private final ImmutableMap<String, ImmutableList<X509Certificate>> bundleMap;
+
+    public SpiffeBundle(Map<String, Long> sequenceNumbers,


nit: Prefer using a static factory (and a private constructor) instead in case we need to do work in the constructor in the future (e.g. validation of the inputs).

This class is a part of non-public API and the intent is to use it as a simple 'value' class, similar to https://github.com/grpc/grpc-java/blob/master/core/src/main/java/io/grpc/internal/SpiffeUtil.java#L103. If we need to add some validation, I'd prefer to do it in a caller code instead.
But definitely constructor should be private, fixed

matthewstevenson88 · 2024-09-26T18:56:00Z

core/src/main/java/io/grpc/internal/SpiffeUtil2.java

+
+    private final ImmutableMap<String, Long> sequenceNumbers;
+
+    private final ImmutableMap<String, ImmutableList<X509Certificate>> bundleMap;


nit: Should it be ImmutableSet rather than ImmutableList?

Rationale: There is no inherent order to the trusted certs in this list. If we ultimately need to feed this in to an API that only accepts a List, I'm fine keeping it tho.

That's a really interesting question. JDK API uses arrays, and gRPC Java uses lists -

grpc-java/xds/src/main/java/io/grpc/xds/internal/security/certprovider/CertificateProvider.java

Line 46 in 927d215

void updateTrustedRoots(List<X509Certificate> trustedRoots);

I suspect the issue with Sets is that X509Certificate itself is an abstract class, so developers can override equals/hashcode and it might lead to bugs.
So I'd just prefer to leave it a List similar with surrounding classes

matthewstevenson88 · 2024-09-26T18:57:04Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+    return Optional.absent();
+  }
+
+  public static TrustBundle loadTrustBundleFromFile(String trustBundleFile) throws IOException {


OK to resolve

matthewstevenson88 · 2024-09-26T18:57:15Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+    Path path = Paths.get(checkNotNull(trustBundleFile, "trustBundleFile"));
+    String json = new String(Files.readAllBytes(path), StandardCharsets.UTF_8);
+    Object jsonObject = JsonParser.parse(json);
+    if (!(jsonObject instanceof Map)) {


Ok to resolve, I don't have a strong preference

matthewstevenson88 · 2024-09-26T18:57:21Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+    return Optional.absent();
+  }
+
+  public static TrustBundle loadTrustBundleFromFile(String trustBundleFile) throws IOException {


Ok to resolve.

matthewstevenson88 · 2024-09-26T18:59:59Z

core/src/main/java/io/grpc/internal/SpiffeUtil2.java

+    }
+    @SuppressWarnings("unchecked")
+    Map<String, ?> root = (Map<String, ?>)jsonObject;
+    Map<String, ?> trustDomainsNode = JsonUtil.getObject(root, "trust_domains");


nit: Can trust_domains be a constant? Similarly for the other string literals below.

I had a similar thought, but other json parsing examples in the repo never use constants for such cases, for example https://github.com/grpc/grpc-java/blob/master/core/src/main/java/io/grpc/internal/ServiceConfigUtil.java

matthewstevenson88 · 2024-09-27T04:19:40Z

core/src/main/java/io/grpc/internal/SpiffeUtil.java

+
+    private final Map<String, Long> sequenceNumbers;
+
+    private final Map<String, List<X509Certificate>> trustBundleMap;


Ok to resolve.

matthewstevenson88 · 2024-09-27T04:22:51Z

core/src/test/resources/io/grpc/internal/spiffebundle.json

+        {
+          "kty": "RSA",
+          "use": "x509-svid",
+          "x5c": "-----BEGIN CERTIFICATE-----


Per offline discussions, we need to remove the block headers. Similarly throughout.

matthewstevenson88 · 2024-09-27T04:24:02Z

core/src/test/java/io/grpc/internal/SpiffeUtil2Test.java

+  public void extractSpiffeIdSuccessTest() throws CertificateParsingException {
+    Optional<SpiffeUtil2.SpiffeId> spiffeId = SpiffeUtil2.extractSpiffeId(spiffeCert);
+    assertEquals("foo.bar.com", spiffeId.get().getTrustDomain());
+    assertEquals("client/workload/1", spiffeId.get().getPath());


nit: Shouldn't the path be prefixed with "/"?

Correct, this is a deficiency of this dummy impl. It's fixed after merging with real parsing library at https://github.com/grpc/grpc-java/pull/11575/files#diff-fdbe5016403200b9fc7adab29732582366f2494986933098d86fddd1081d6a0bR241

matthewstevenson88 · 2024-09-27T04:24:28Z

core/src/test/java/io/grpc/internal/SpiffeUtil2Test.java

+
+  private X509Certificate[] spiffeCert;
+  private X509Certificate[] spiffeMultiCert;
+  private X509Certificate[] serverCert0;


nit: Why is there a 0 suffix? Can this be omitted?

It's an existing cert from other tests I'm reusing (they have server0 and server1), so I just keep the name aligned with other tests - https://github.com/grpc/grpc-java/blob/master/testing/src/main/resources/certs/server0.pem

matthewstevenson88 · 2024-09-27T04:24:52Z

core/src/test/java/io/grpc/internal/SpiffeUtil2Test.java

+
+
+  private X509Certificate[] spiffeCert;
+  private X509Certificate[] spiffeMultiCert;


nit: "SPIFFE multi cert" is a bit misleading, could we rename it (and the file) to "multipleUriSanCert"?

Done in #11575

matthewstevenson88 · 2024-09-27T04:25:47Z

core/src/test/java/io/grpc/internal/SpiffeUtil2Test.java

+  }
+
+  @Test
+  public void extractSpiffeIdParameterValidityTest() {


Can we add a test where we fail to extract a SPIFFE ID from a cert without any URI SANs?

We don't 'hard fail' in that case, but just return Optional.absent - https://github.com/grpc/grpc-java/pull/11575/files#diff-fdbe5016403200b9fc7adab29732582366f2494986933098d86fddd1081d6a0bR258

erm-g · 2024-09-30T03:25:42Z

Closed in favor if #11575

erm-g added 6 commits September 9, 2024 03:30

Spiffe extraction logic with basic tests

23c7c2f

TrustBundle load API

af0698b

Move spiffebundle.txt to correct module

02ad4e4

Unit tests

5fe87fa

Additional spec checks

c2a6035

SpiffeId parsing from non spiffe cert

adb7e31

erm-g requested a review from matthewstevenson88 September 13, 2024 03:28

matthewstevenson88 reviewed Sep 13, 2024

View reviewed changes

erm-g added 7 commits September 17, 2024 17:37

Tests and certs for Multi URI SAN

df19d44

Address PR comments

0312dc1

JsonParser to not allow duplicate elements

775de8f

Add a parameter to JsonParser to select parsing mode

f60a829

Expose extra api for no duplicate parsing

cc64e6d

Fix typo

add1f55

Extracted functionality from loadTrustBundleFromFile into few helper …

00967a3

…methods

erm-g requested a review from matthewstevenson88 September 20, 2024 02:07

matthewstevenson88 reviewed Sep 20, 2024

View reviewed changes

erm-g added 2 commits September 23, 2024 02:32

Address PR comments

473b1ab

Address PR comments

d1e9c31

erm-g requested a review from matthewstevenson88 September 25, 2024 19:12

Address PR comments

2843eff

matthewstevenson88 reviewed Sep 26, 2024

View reviewed changes

matthewstevenson88 reviewed Sep 27, 2024

View reviewed changes

erm-g closed this Sep 30, 2024


		private SpiffeUtil() {}

		public static Optional<SpiffeId> extractSpiffeId(X509Certificate[] certChain)


		public static class TrustBundle {

		private final Map<String, Long> sequenceNumbers;


		private final Map<String, Long> sequenceNumbers;

		private final Map<String, List<X509Certificate>> trustBundleMap;


		private final ImmutableMap<String, ImmutableList<X509Certificate>> bundleMap;

		public SpiffeBundle(Map<String, Long> sequenceNumbers,


		private final ImmutableMap<String, Long> sequenceNumbers;

		private final ImmutableMap<String, ImmutableList<X509Certificate>> bundleMap;



		private X509Certificate[] spiffeCert;
		private X509Certificate[] spiffeMultiCert;

core: Spiffe Utils #11522

core: Spiffe Utils #11522

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erm-g commented Sep 13, 2024

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erm-g Sep 23, 2024 • edited Loading

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matthewstevenson88 Sep 26, 2024 • edited Loading

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erm-g Sep 23, 2024 •

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matthewstevenson88 Sep 26, 2024 •

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