internal/credentials: fix a bug and add one more helper function SPIFFEIDFromCert (#3929)
* internal/credentials: fix a bug and add one more helper function
diff --git a/internal/credentials/spiffe.go b/internal/credentials/spiffe.go
index b66e3db..be70b6c 100644
--- a/internal/credentials/spiffe.go
+++ b/internal/credentials/spiffe.go
@@ -25,6 +25,7 @@
import (
"crypto/tls"
+ "crypto/x509"
"net/url"
"google.golang.org/grpc/grpclog"
@@ -38,8 +39,17 @@
if len(state.PeerCertificates) == 0 || len(state.PeerCertificates[0].URIs) == 0 {
return nil
}
+ return SPIFFEIDFromCert(state.PeerCertificates[0])
+}
+
+// SPIFFEIDFromCert parses the SPIFFE ID from x509.Certificate. If the SPIFFE
+// ID format is invalid, return nil with warning.
+func SPIFFEIDFromCert(cert *x509.Certificate) *url.URL {
+ if cert == nil || cert.URIs == nil {
+ return nil
+ }
var spiffeID *url.URL
- for _, uri := range state.PeerCertificates[0].URIs {
+ for _, uri := range cert.URIs {
if uri == nil || uri.Scheme != "spiffe" || uri.Opaque != "" || (uri.User != nil && uri.User.Username() != "") {
continue
}
@@ -48,7 +58,7 @@
logger.Warning("invalid SPIFFE ID: total ID length larger than 2048 bytes")
return nil
}
- if len(uri.Host) == 0 || len(uri.RawPath) == 0 || len(uri.Path) == 0 {
+ if len(uri.Host) == 0 || len(uri.Path) == 0 {
logger.Warning("invalid SPIFFE ID: domain or workload ID is empty")
return nil
}
@@ -57,7 +67,7 @@
return nil
}
// A valid SPIFFE certificate can only have exactly one URI SAN field.
- if len(state.PeerCertificates[0].URIs) > 1 {
+ if len(cert.URIs) > 1 {
logger.Warning("invalid SPIFFE ID: multiple URI SANs")
return nil
}
diff --git a/internal/credentials/spiffe_test.go b/internal/credentials/spiffe_test.go
index 324874e..599481a 100644
--- a/internal/credentials/spiffe_test.go
+++ b/internal/credentials/spiffe_test.go
@@ -21,12 +21,17 @@
import (
"crypto/tls"
"crypto/x509"
+ "encoding/pem"
+ "io/ioutil"
"net/url"
"testing"
"google.golang.org/grpc/internal/grpctest"
+ "google.golang.org/grpc/testdata"
)
+const wantURI = "spiffe://foo.bar.com/client/workload/1"
+
type s struct {
grpctest.Tester
}
@@ -40,12 +45,12 @@
name string
urls []*url.URL
// If we expect a SPIFFE ID to be returned.
- expectID bool
+ wantID bool
}{
{
- name: "empty URIs",
- urls: []*url.URL{},
- expectID: false,
+ name: "empty URIs",
+ urls: []*url.URL{},
+ wantID: false,
},
{
name: "good SPIFFE ID",
@@ -57,7 +62,7 @@
RawPath: "workload/wl1",
},
},
- expectID: true,
+ wantID: true,
},
{
name: "invalid host",
@@ -69,7 +74,7 @@
RawPath: "workload/wl1",
},
},
- expectID: false,
+ wantID: false,
},
{
name: "invalid path",
@@ -81,7 +86,7 @@
RawPath: "",
},
},
- expectID: false,
+ wantID: false,
},
{
name: "large path",
@@ -93,7 +98,7 @@
RawPath: string(make([]byte, 2050)),
},
},
- expectID: false,
+ wantID: false,
},
{
name: "large host",
@@ -105,7 +110,7 @@
RawPath: "workload/wl1",
},
},
- expectID: false,
+ wantID: false,
},
{
name: "multiple URI SANs",
@@ -129,7 +134,7 @@
RawPath: "workload/wl1",
},
},
- expectID: false,
+ wantID: false,
},
{
name: "multiple URI SANs without SPIFFE ID",
@@ -147,7 +152,7 @@
RawPath: "workload/wl1",
},
},
- expectID: false,
+ wantID: false,
},
{
name: "multiple URI SANs with one SPIFFE ID",
@@ -165,15 +170,63 @@
RawPath: "workload/wl1",
},
},
- expectID: false,
+ wantID: false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
state := tls.ConnectionState{PeerCertificates: []*x509.Certificate{{URIs: tt.urls}}}
id := SPIFFEIDFromState(state)
- if got, want := id != nil, tt.expectID; got != want {
- t.Errorf("want expectID = %v, but SPIFFE ID is %v", want, id)
+ if got, want := id != nil, tt.wantID; got != want {
+ t.Errorf("want wantID = %v, but SPIFFE ID is %v", want, id)
+ }
+ })
+ }
+}
+
+func (s) TestSPIFFEIDFromCert(t *testing.T) {
+ tests := []struct {
+ name string
+ dataPath string
+ // If we expect a SPIFFE ID to be returned.
+ wantID bool
+ }{
+ {
+ name: "good certificate with SPIFFE ID",
+ dataPath: "x509/spiffe_cert.pem",
+ wantID: true,
+ },
+ {
+ name: "bad certificate with SPIFFE ID and another URI",
+ dataPath: "x509/multiple_uri_cert.pem",
+ wantID: false,
+ },
+ {
+ name: "certificate without SPIFFE ID",
+ dataPath: "x509/client1_cert.pem",
+ wantID: false,
+ },
+ }
+ for _, tt := range tests {
+ t.Run(tt.name, func(t *testing.T) {
+ data, err := ioutil.ReadFile(testdata.Path(tt.dataPath))
+ if err != nil {
+ t.Fatalf("ioutil.ReadFile(%s) failed: %v", testdata.Path(tt.dataPath), err)
+ }
+ block, _ := pem.Decode(data)
+ if block == nil {
+ t.Fatalf("Failed to parse the certificate: byte block is nil")
+ }
+ cert, err := x509.ParseCertificate(block.Bytes)
+ if err != nil {
+ t.Fatalf("x509.ParseCertificate(%b) failed: %v", block.Bytes, err)
+ }
+ uri := SPIFFEIDFromCert(cert)
+ if (uri != nil) != tt.wantID {
+ t.Fatalf("wantID got and want mismatch, got %t, want %t", uri != nil, tt.wantID)
+ }
+ if uri != nil && uri.String() != wantURI {
+ t.Fatalf("SPIFFE ID not expected, got %s, want %s", uri.String(), wantURI)
}
})
}
diff --git a/testdata/x509/create.sh b/testdata/x509/create.sh
index ecfcfd1..5bd3c58 100755
--- a/testdata/x509/create.sh
+++ b/testdata/x509/create.sh
@@ -100,5 +100,24 @@
-extensions test_client
openssl verify -verbose -CAfile client_ca_cert.pem client2_cert.pem
+# Generate a cert with SPIFFE ID.
+openssl req -x509 \
+ -newkey rsa:4096 \
+ -keyout spiffe_key.pem \
+ -out spiffe_cert.pem \
+ -nodes \
+ -days 3650 \
+ -subj /C=US/ST=CA/L=SVL/O=gRPC/CN=test-client1/ \
+ -addext "subjectAltName = URI:spiffe://foo.bar.com/client/workload/1"
+
+# Generate a cert with SPIFFE ID and another SAN URI field(which doesn't meet SPIFFE specs).
+openssl req -x509 \
+ -newkey rsa:4096 \
+ -keyout multiple_uri_key.pem \
+ -out multiple_uri_cert.pem \
+ -nodes \
+ -days 3650 \
+ -subj /C=US/ST=CA/L=SVL/O=gRPC/CN=test-client1/ \
+ -addext "subjectAltName = URI:spiffe://foo.bar.com/client/workload/1, URI:https://bar.baz.com/client"
# Cleanup the CSRs.
rm *_csr.pem
diff --git a/testdata/x509/multiple_uri_cert.pem b/testdata/x509/multiple_uri_cert.pem
new file mode 100644
index 0000000..9763799
--- /dev/null
+++ b/testdata/x509/multiple_uri_cert.pem
@@ -0,0 +1,34 @@
+-----BEGIN CERTIFICATE-----
+MIIFzjCCA7agAwIBAgIUI8r7b2hX9DRwEQGWuRdk32eU5kowDQYJKoZIhvcNAQEL
+BQAwTjELMAkGA1UEBhMCVVMxCzAJBgNVBAgMAkNBMQwwCgYDVQQHDANTVkwxDTAL
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+E5uVb2sBy+vx+82IwVzWN0o7380AEmAA5nrA6fMaxTxmo07pOF7avAZ34LgHJIjr
+sTM=
+-----END CERTIFICATE-----
diff --git a/testdata/x509/multiple_uri_key.pem b/testdata/x509/multiple_uri_key.pem
new file mode 100644
index 0000000..c2918fd
--- /dev/null
+++ b/testdata/x509/multiple_uri_key.pem
@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
+MIIJQQIBADANBgkqhkiG9w0BAQEFAASCCSswggknAgEAAoICAQCm/zjNYkfCTcq7
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+zJOG+48NgohVKfBhGN7JyxV1dq/X
+-----END PRIVATE KEY-----
diff --git a/testdata/x509/spiffe_cert.pem b/testdata/x509/spiffe_cert.pem
new file mode 100644
index 0000000..0ce0a1a
--- /dev/null
+++ b/testdata/x509/spiffe_cert.pem
@@ -0,0 +1,33 @@
+-----BEGIN CERTIFICATE-----
+MIIFsjCCA5qgAwIBAgIUPxiyjwxoDyMeRvl4g9TSdvLlCA0wDQYJKoZIhvcNAQEL
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+p+z97N7TvWfgE1HOmYDfsbaHjPFZKg==
+-----END CERTIFICATE-----
diff --git a/testdata/x509/spiffe_key.pem b/testdata/x509/spiffe_key.pem
new file mode 100644
index 0000000..5462d66
--- /dev/null
+++ b/testdata/x509/spiffe_key.pem
@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+Xgln2zbN6APAb+dGDdv27dz4YlasU4s=
+-----END PRIVATE KEY-----
