Support Windows SCEP request certificates on Go 1.23

.github/workflows/ci.yml

@@ -6,7 +6,7 @@ jobs:
     name: Test
     strategy:
       matrix:
-        go: ['1.12', '1.13', '1.14', '1.15', '1.16']
+        go: ['1.14', '1.15', '1.16', '1.21', '1.22', '1.23']
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
@@ -15,6 +15,7 @@ jobs:
     - uses: actions/setup-go@v4
       with:
         go-version: ${{ matrix.go }}
-        stable: false
     - name: Test
       run: go vet . && go build . && go test -count=1 -covermode=count -coverprofile=coverage.out .
+      env:
+        GODEBUG: x509sha1=1 # enable SHA1; it's used in the older fixtures

go.mod

@@ -1,3 +1,5 @@
 module github.com/smallstep/pkcs7
 
-go 1.11
+go 1.14
+
+require golang.org/x/crypto v0.27.0

go.sum

@@ -0,0 +1,65 @@
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internal/legacy/x509/debug.go

@@ -0,0 +1,14 @@
+package legacyx509
+
+import "fmt"
+
+// legacyGodebugSetting is a type mimicking Go's internal godebug package
+// settings, which are used to enable / disable certain functionalities at
+// build time.
+type legacyGodebugSetting int
+
+func (s legacyGodebugSetting) Value() string {
+	return fmt.Sprintf("%d", s)
+}
+
+func (s legacyGodebugSetting) IncNonDefault() {}

internal/legacy/x509/doc.go

@@ -0,0 +1,14 @@
+/*
+Package legacyx509 is a copy of certain parts of Go's crypto/x509 package.
+It is based on Go 1.23, and has just the parts copied over required for
+parsing X509 certificates.
+
+The primary reason this copy exists is to keep support for parsing PKCS7
+messages containing Simple Certificate Enrolment Protocol (SCEP) requests
+from Windows devices. Go 1.23 made a change marking certificates with a
+critical authority key identifier as invalid, which is mandated by RFC 5280,
+but apparently Windows marks those specific certificates as such, resulting
+in those SCEP requests failing from being parsed correctly.
+*/
+
+package legacyx509