Kyle Carberry e3db203011 fix(coderd/azureidentity): set explicit roots to avoid macOS system verifier (#25136)
Fixes
[CODAGT-372](https://linear.app/codercom/issue/CODAGT-372/coderdazureidentity-testvalidateregular-fails-on-macos).
Closes coder/internal#101.

## Problem

`coderd/azureidentity TestValidate/regular` fails on macOS with:

```
verify signature:
    github.com/coder/coder/v2/coderd/azureidentity.Validate
        /Users/runner/work/coder/coder/coderd/azureidentity/azureidentity.go:75
  - x509: “metadata.azure.com” certificate is not standards compliant
```

When `crypto/x509.VerifyOptions.Roots` is `nil`, Go's verifier on
macOS/iOS falls back to the system verifier (`systemVerify` in
`crypto/x509/root_darwin.go`), which delegates to Apple's
`SecTrustEvaluateWithError`. Apple's framework enforces stricter
standards-compliance checks than Go's pure-Go verifier and rejects some
otherwise valid Azure instance-identity leaf certificates with
`errSecCertificateIsNotStandardsCompliant`, surfaced as the `not
standards compliant` error.

The test had been skipped on darwin since #12979 (April 2024) as a
workaround.

## Fix

- Embed the three root CAs that Azure instance-identity certificates
ultimately chain to:
  - DigiCert Global Root G2
  - DigiCert Global Root G3
- Baltimore CyberTrust Root (kept for historical chains via `Microsoft
RSA TLS CA 01/02`)
- In `Validate`, populate `options.Roots` from those embedded roots when
the caller does not supply its own pool. Because `Roots != nil`, Go no
longer takes the `systemVerify` path on darwin and uses the pure-Go
verifier on all platforms.
- Remove the `runtime.GOOS == "darwin"` skip from `TestValidate`.
- Add `TestEmbeddedRoots` to guard against future regressions in the
embedded root list (parses each PEM, asserts self-signed, requires all
three named roots).

The caller's existing `Intermediates` handling is unchanged. Tests that
pass their own `Roots` (e.g. `coderdtest.NewAzureInstanceIdentity`) are
unaffected.

## Verification

On Linux:

```
$ go test ./coderd/azureidentity/ -race -count=1 -v
=== RUN   TestValidate
=== RUN   TestValidate/regular
=== RUN   TestValidate/govcloud
=== RUN   TestValidate/rsa
--- PASS: TestValidate (0.00s)
    --- PASS: TestValidate/regular (0.00s)
    --- PASS: TestValidate/rsa (0.00s)
    --- PASS: TestValidate/govcloud (0.00s)
=== RUN   TestEmbeddedRoots
--- PASS: TestEmbeddedRoots (0.00s)
=== RUN   TestExpiresSoon
--- SKIP: TestExpiresSoon (0.00s)
PASS
ok      github.com/coder/coder/v2/coderd/azureidentity 1.020s
```

The `test-go-pg` job on `macos-latest` in CI is the authoritative
confirmation of the fix on macOS; previously it would have failed
`TestValidate/regular` had the skip been removed.

<details>
<summary>Why this is the correct fix</summary>

From `/usr/local/go/src/crypto/x509/verify.go`:

```go
// Use platform verifiers, where available, if Roots is from SystemCertPool.
if runtime.GOOS == "windows" || runtime.GOOS == "darwin" || runtime.GOOS == "ios" {
    systemPool := systemRootsPool()
    if opts.Roots == nil && (systemPool == nil || systemPool.systemPool) {
        return c.systemVerify(&opts)
    }
    ...
}
```

Setting `opts.Roots` to any non-nil, non-system pool deterministically
routes verification through Go's pure-Go verifier, bypassing Apple's
stricter compliance checks. The embedded roots are sufficient to
validate every chain we currently care about, since every intermediate
in `Certificates` ultimately issues to one of the three embedded roots.

</details>

> Generated by Coder Agents. Reviewed manually.
2026-05-11 13:53:33 -04:00
2022-04-04 11:55:06 -05:00

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