mirror of https://github.com/helm/helm
Merge 276fea0121 into a572f23b82
Ruslan Shaydullin
1 day ago
committed by
GitHub
commit
c61ec0d90a
@ -0,0 +1,113 @@
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/*
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Copyright The Helm Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package provenance
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import (
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"bytes"
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"encoding/binary"
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"errors"
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"fmt"
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)
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// GnuPG 2.1+ stores public keys in a "keybox" (pubring.kbx) — a container
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// format that interleaves OpenPGP keyblocks with GnuPG-specific metadata. It
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// is not an OpenPGP packet stream, so it cannot be handed to
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// openpgp.ReadKeyRing directly. A keybox is a sequence of blobs, each starting
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// with:
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//
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// byte 0..3 u32 blob length, big endian, including this header
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// byte 4 u8 blob type (0 empty, 1 header, 2 OpenPGP, 3 X.509)
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// byte 5 u8 blob version
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//
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// The first blob is a header carrying the "KBXf" magic at offset 8. OpenPGP
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// blobs (type 2) record where the raw keyblock lives inside the blob:
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//
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// byte 8..11 u32 keyblock offset, relative to the blob start
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// byte 12..15 u32 keyblock length
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//
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// Reference: kbx/keybox-blob.c in the GnuPG source tree.
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const (
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kbxBlobTypeHeader = 1
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kbxBlobTypeOpenPGP = 2
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// kbxBlobFlagEphemeral marks a blob GnuPG considers not (yet) part of
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// the keyring, e.g. written during an interrupted keyserver operation
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// (KEYBOX_FLAG_BLOB_EPHEMERAL in kbx/keybox.h). GnuPG skips such blobs
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// on every normal read (kbx/keybox-search.c), and so do we.
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kbxBlobFlagEphemeral = 0x0002
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// kbxMinBlobLen covers the length and type fields present in every blob.
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kbxMinBlobLen = 5
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// kbxOpenPGPHeaderLen is how much of an OpenPGP blob header must be
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// present for the flags, keyblock offset and keyblock length fields to
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// be readable.
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kbxOpenPGPHeaderLen = 16
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)
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// isKeybox reports whether data looks like a GnuPG keybox (pubring.kbx)
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// image, identified by the "KBXf" magic in the mandatory first header blob.
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func isKeybox(data []byte) bool {
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return len(data) >= 12 && data[4] == kbxBlobTypeHeader && string(data[8:12]) == "KBXf"
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}
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// isArmored reports whether data looks like an ASCII-armored keyring, as
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// produced by `gpg --export --armor`.
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func isArmored(data []byte) bool {
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return bytes.HasPrefix(bytes.TrimSpace(data), []byte("-----BEGIN PGP"))
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}
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// keyboxPublicKeys extracts the OpenPGP keyblocks embedded in a keybox image
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// and returns them concatenated, ready for openpgp.ReadKeyRing. Blobs of any
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// other type (header, X.509, empty) are skipped, as are blobs flagged
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// ephemeral, which GnuPG itself ignores when reading the keyring. Malformed
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// input yields an error, never a panic.
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func keyboxPublicKeys(data []byte) ([]byte, error) {
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var keyblocks bytes.Buffer
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for offset := 0; offset < len(data); {
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rest := data[offset:]
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if len(rest) < kbxMinBlobLen {
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return nil, fmt.Errorf("truncated blob header at offset %d", offset)
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}
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blobLen := binary.BigEndian.Uint32(rest)
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if blobLen < kbxMinBlobLen {
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return nil, fmt.Errorf("invalid blob length %d at offset %d", blobLen, offset)
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}
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if uint64(blobLen) > uint64(len(rest)) {
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return nil, fmt.Errorf("blob at offset %d has length %d exceeding the %d remaining bytes", offset, blobLen, len(rest))
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}
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blob := rest[:blobLen]
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if blob[4] == kbxBlobTypeOpenPGP {
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if len(blob) < kbxOpenPGPHeaderLen {
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return nil, fmt.Errorf("OpenPGP blob at offset %d is too short", offset)
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}
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flags := binary.BigEndian.Uint16(blob[6:])
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keyblockOffset := binary.BigEndian.Uint32(blob[8:])
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keyblockLen := binary.BigEndian.Uint32(blob[12:])
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if uint64(keyblockOffset)+uint64(keyblockLen) > uint64(len(blob)) {
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return nil, fmt.Errorf("OpenPGP blob at offset %d has an out-of-range keyblock", offset)
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}
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if flags&kbxBlobFlagEphemeral == 0 {
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keyblocks.Write(blob[keyblockOffset : keyblockOffset+keyblockLen])
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}
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}
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offset += int(blobLen)
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}
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if keyblocks.Len() == 0 {
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return nil, errors.New("keybox contains no OpenPGP keys")
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}
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return keyblocks.Bytes(), nil
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}
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@ -0,0 +1,188 @@
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/*
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Copyright The Helm Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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|
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http://www.apache.org/licenses/LICENSE-2.0
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|
||||
Unless required by applicable law or agreed to in writing, software
|
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distributed under the License is distributed on an "AS IS" BASIS,
|
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package provenance
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import (
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"bytes"
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"encoding/binary"
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"os"
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"testing"
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"github.com/ProtonMail/go-crypto/openpgp"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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const (
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// testKeybox is a GnuPG keybox (pubring.kbx) containing the helm-test
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// public key. Regenerate with testdata/regen-keyring-formats.sh.
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testKeybox = "testdata/helm-test-key.kbx"
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// testMixedKeybox is a keybox containing the RSA and Ed25519 test keys.
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testMixedKeybox = "testdata/helm-mixed-keyring.kbx"
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// testArmoredPubfile is the ASCII-armored export of the helm-test key.
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testArmoredPubfile = "testdata/helm-test-key.asc"
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// testMultiBlockArmored is two concatenated single-key armored exports
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// (cat key1.asc key2.asc), covering the RSA and Ed25519 test keys.
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testMultiBlockArmored = "testdata/helm-mixed-keyring.asc"
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)
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func TestIsKeybox(t *testing.T) {
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tests := []struct {
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name string
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file string
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want bool
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}{
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{"keybox", testKeybox, true},
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{"mixed keybox", testMixedKeybox, true},
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{"legacy binary keyring", testPubfile, false},
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{"armored keyring", testArmoredPubfile, false},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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data, err := os.ReadFile(tt.file)
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require.NoError(t, err)
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assert.Equal(t, tt.want, isKeybox(data))
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})
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}
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t.Run("degenerate inputs", func(t *testing.T) {
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assert.False(t, isKeybox(nil))
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assert.False(t, isKeybox([]byte{}))
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assert.False(t, isKeybox([]byte("KBXf")))
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assert.False(t, isKeybox([]byte("garbage that is longer than twelve bytes")))
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})
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}
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func TestIsArmored(t *testing.T) {
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tests := []struct {
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name string
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file string
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want bool
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}{
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{"armored keyring", testArmoredPubfile, true},
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{"legacy binary keyring", testPubfile, false},
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{"keybox", testKeybox, false},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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data, err := os.ReadFile(tt.file)
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require.NoError(t, err)
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assert.Equal(t, tt.want, isArmored(data))
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})
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}
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t.Run("degenerate inputs", func(t *testing.T) {
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assert.False(t, isArmored(nil))
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assert.False(t, isArmored([]byte("not a key")))
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assert.True(t, isArmored([]byte("\n\t -----BEGIN PGP PUBLIC KEY BLOCK-----")))
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})
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}
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func TestKeyboxPublicKeys(t *testing.T) {
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data, err := os.ReadFile(testKeybox)
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require.NoError(t, err)
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keys, err := keyboxPublicKeys(data)
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require.NoError(t, err)
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ring, err := openpgp.ReadKeyRing(bytes.NewReader(keys))
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require.NoError(t, err)
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require.Len(t, ring, 1)
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_, ok := ring[0].Identities[testKeyName]
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assert.True(t, ok, "expected keybox to contain %q", testKeyName)
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}
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func TestKeyboxPublicKeysEphemeral(t *testing.T) {
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// GnuPG flags in-progress key material as ephemeral (bit 0x0002 of the
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// blob flags at blob offset 6) and hides it from every normal read; the
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// parser must do the same.
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setFlags := func(t *testing.T, data []byte, blobStart int, flags uint16) []byte {
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t.Helper()
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require.Equal(t, byte(kbxBlobTypeOpenPGP), data[blobStart+4])
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mutated := bytes.Clone(data)
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binary.BigEndian.PutUint16(mutated[blobStart+6:], flags)
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return mutated
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}
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t.Run("all blobs ephemeral means no keys", func(t *testing.T) {
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valid, err := os.ReadFile(testKeybox)
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require.NoError(t, err)
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_, err = keyboxPublicKeys(setFlags(t, valid, 32, kbxBlobFlagEphemeral))
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assert.ErrorContains(t, err, "no OpenPGP keys")
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})
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t.Run("ephemeral blob is skipped, others kept", func(t *testing.T) {
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valid, err := os.ReadFile(testMixedKeybox)
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require.NoError(t, err)
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// Flag only the first OpenPGP blob (the RSA helm-test key).
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keys, err := keyboxPublicKeys(setFlags(t, valid, 32, kbxBlobFlagEphemeral))
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require.NoError(t, err)
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ring, err := openpgp.ReadKeyRing(bytes.NewReader(keys))
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require.NoError(t, err)
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require.Len(t, ring, 1)
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_, ok := ring[0].Identities[testKeyName]
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assert.False(t, ok, "expected the ephemeral-flagged %q blob to be skipped", testKeyName)
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})
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}
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func TestKeyboxPublicKeysMalformed(t *testing.T) {
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valid, err := os.ReadFile(testKeybox)
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require.NoError(t, err)
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// The mutations below rely on the fixture layout: a 32-byte header blob
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// followed by an OpenPGP blob.
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const blobStart = 32
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require.Greater(t, len(valid), blobStart+16)
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require.Equal(t, byte(kbxBlobTypeOpenPGP), valid[blobStart+4])
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mutate := func(offset int, value uint32) []byte {
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data := bytes.Clone(valid)
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binary.BigEndian.PutUint32(data[offset:], value)
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return data
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}
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tests := []struct {
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name string
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data []byte
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}{
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{"header only, no keys", valid[:blobStart]},
|
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{"truncated inside blob header", valid[:blobStart+2]},
|
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{"truncated inside blob body", valid[:blobStart+16]},
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{"zero blob length", mutate(blobStart, 0)},
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{"blob length below minimum", mutate(blobStart, 4)},
|
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{"blob length past end of data", mutate(blobStart, uint32(len(valid))+1)},
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{"keyblock offset out of range", mutate(blobStart+8, uint32(len(valid)))},
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{"keyblock length out of range", mutate(blobStart+12, uint32(len(valid)))},
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{"keyblock offset overflow", mutate(blobStart+8, ^uint32(0))},
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{"keyblock length overflow", mutate(blobStart+12, ^uint32(0))},
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{"openpgp blob shorter than its header", append(bytes.Clone(valid[:blobStart]), 0, 0, 0, 8, kbxBlobTypeOpenPGP, 1, 0, 0)},
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{"empty input", nil},
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}
|
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
|
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_, err := keyboxPublicKeys(tt.data)
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assert.Error(t, err)
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})
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}
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}
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@ -0,0 +1,40 @@
|
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-----BEGIN PGP PUBLIC KEY BLOCK-----
|
||||
|
||||
mQENBFeWbZ4BCADIsgNRyVBSWJkbH6h3UWWXsA9ce1u+YKvaCYFSjIujKycTAqCC
|
||||
P7qUV2Oj/4E2zUcOD1/8/meDwuTnNTLzdSw4ujtFlKRSw7zelQE6sxvID0KM0pQK
|
||||
7AxDTXsm/7Afd/fg4WNW0/hcbeiNz4TVmSWAnbqeLg8o8eljR5QhTk47H6Glo4hV
|
||||
raeLCKG77qm2qOQ/m38ec+L5n9iUpoZZu1S5RXPUIanV5pLlx2rQsooIQEdJbTRF
|
||||
Iv3+2Nj/56PFVdrw7E5ARqCD4PpzzYV7uj8vKumOp+VivFj95Ze6DFENh1WWy336
|
||||
jQEj0uTolgOYeQ6AdJobwSPUeYXGV6Sf2vwXABEBAAG0XUhlbG0gVGVzdGluZyAo
|
||||
VGhpcyBrZXkgc2hvdWxkIG9ubHkgYmUgdXNlZCBmb3IgdGVzdGluZy4gRE8gTk9U
|
||||
IFRSVVNULikgPGhlbG0tdGVzdGluZ0BoZWxtLnNoPokBNwQTAQoAIQUCV5ZtngIb
|
||||
AwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgAAKCRCEO7+YH8GHYolFCAC0+ejT5dIX
|
||||
0juRl5AdG6XAlEf9IrehkVlo0s5bG1Ucea9jjNRafmmHyMravrxZVI9zGFhaNpxA
|
||||
+McnnWAO8lx5yTgnGW269qvFBsj5n0ItPewILQZjTEgwLYf1oc2qCFpk+8ovBnxZ
|
||||
Kaz3J5QKqU09zLO2yALuI5FTCCUupJ3OGIrKvLJ4H2jsRk/5jgqIgqJotW/4Baza
|
||||
4zemFdQHj9FPvq9sVeW5lyxM48i638GtslIgc0y2Yd/bfiy0tfIkskWz/kS1U6c9
|
||||
Utr3UPwpBqHjXnakmpK7GMGlp5eDXgr63BEdLKxJJWWxIys35fR19XZXcAELrwMh
|
||||
zkTzB/dvI375uQENBFeWbZ4BCADB6a8oiF2royWbvwmujBxSmD68QWziNZbSCuRs
|
||||
M4WM1iy69kspJHRwJEVIE5pkoVfV6tIcwQQ0VkJmq6Pf/pyKeMAXp0u8bp5K0mVE
|
||||
Yio1/adiLM3kX1yleoXLNUb1gNvsk6Kp6BZCUNRmjKlbKxapJKHmL+opX8UoeLeE
|
||||
KSgJNL8jvo3nRgg+wIPnVDoizz7y03F0k4SbgNGdoA/FtZs/vcSrEfzOLgI2RxQS
|
||||
dj/ePkxg9TvQygUSYgAVbYlASw6XMmd/zTjkfD9qa0l3WSejTisn85b611WryDpA
|
||||
iYkYC3GzK8g7S9VwkAbtr79cbG+1djlA4aHASpil+zR12yEhABEBAAGJAR8EGAEK
|
||||
AAkFAleWbZ4CGwwACgkQhDu/mB/Bh2LbNQgAiOOMNzmKzY4A7/ra8ppaH9oL8XIa
|
||||
WvInivOsx22K09PPuPVqi/ooBiRGyRqhdVS4ShPOoOTR5tOsdfPpEMTHnGQ1+jW+
|
||||
Tw5MXv3oMckWw3YEYptnuvon3wT4bOXLr+eYlY4Z1ONs+pAXwMiQ2zXNuKHpA2fR
|
||||
HsF8Wyw57rCVn7K5nQgZCbVxasYlzvFGnmt/itSC5w/AnIvICDOWcoGFKTieqhME
|
||||
IkCyvu+DNrMAumnD2fqF2olsM4IzCEPSMEQqJIGzZTtQTseS8NSDioRGnG1AJQ94
|
||||
BssQVmTh0/hlpoTqXY803lR5wb1fr3RRnkOu+lbEI6AAUj51j5TAAo/1dA==
|
||||
=bvcV
|
||||
-----END PGP PUBLIC KEY BLOCK-----
|
||||
-----BEGIN PGP PUBLIC KEY BLOCK-----
|
||||
|
||||
mDMEaMzP2xYJKwYBBAHaRw8BAQdAXkL0KKTOZoMaM+6HsrkWv93zmLmnMiIoQvR2
|
||||
F+bjx7G0KEhlbG0gRWQyNTUxOSBUZXN0IDxoZWxtLWVkMjU1MTlAaGVsbS5zaD6I
|
||||
mQQTFgoAQRYhBEy+dUwlWAxsh43nEfuFaBLOL8tkBQJozM/bAhsDBQkFo5qABQsJ
|
||||
CAcCAiICBhUKCQgLAgQWAgMBAh4HAheAAAoJEPuFaBLOL8tktBYA/2cclE0N+BZV
|
||||
Wymk6XfwFMjErM6olWAfwA8DfAGQ55+lAQCqSa+Tkjd4dmToVHcb0QAm+zwklAY4
|
||||
e6qWgGiivn77AA==
|
||||
=wJ7K
|
||||
-----END PGP PUBLIC KEY BLOCK-----
|
||||
Binary file not shown.
@ -0,0 +1,30 @@
|
||||
-----BEGIN PGP PUBLIC KEY BLOCK-----
|
||||
|
||||
mQENBFeWbZ4BCADIsgNRyVBSWJkbH6h3UWWXsA9ce1u+YKvaCYFSjIujKycTAqCC
|
||||
P7qUV2Oj/4E2zUcOD1/8/meDwuTnNTLzdSw4ujtFlKRSw7zelQE6sxvID0KM0pQK
|
||||
7AxDTXsm/7Afd/fg4WNW0/hcbeiNz4TVmSWAnbqeLg8o8eljR5QhTk47H6Glo4hV
|
||||
raeLCKG77qm2qOQ/m38ec+L5n9iUpoZZu1S5RXPUIanV5pLlx2rQsooIQEdJbTRF
|
||||
Iv3+2Nj/56PFVdrw7E5ARqCD4PpzzYV7uj8vKumOp+VivFj95Ze6DFENh1WWy336
|
||||
jQEj0uTolgOYeQ6AdJobwSPUeYXGV6Sf2vwXABEBAAG0XUhlbG0gVGVzdGluZyAo
|
||||
VGhpcyBrZXkgc2hvdWxkIG9ubHkgYmUgdXNlZCBmb3IgdGVzdGluZy4gRE8gTk9U
|
||||
IFRSVVNULikgPGhlbG0tdGVzdGluZ0BoZWxtLnNoPokBNwQTAQoAIQUCV5ZtngIb
|
||||
AwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgAAKCRCEO7+YH8GHYolFCAC0+ejT5dIX
|
||||
0juRl5AdG6XAlEf9IrehkVlo0s5bG1Ucea9jjNRafmmHyMravrxZVI9zGFhaNpxA
|
||||
+McnnWAO8lx5yTgnGW269qvFBsj5n0ItPewILQZjTEgwLYf1oc2qCFpk+8ovBnxZ
|
||||
Kaz3J5QKqU09zLO2yALuI5FTCCUupJ3OGIrKvLJ4H2jsRk/5jgqIgqJotW/4Baza
|
||||
4zemFdQHj9FPvq9sVeW5lyxM48i638GtslIgc0y2Yd/bfiy0tfIkskWz/kS1U6c9
|
||||
Utr3UPwpBqHjXnakmpK7GMGlp5eDXgr63BEdLKxJJWWxIys35fR19XZXcAELrwMh
|
||||
zkTzB/dvI375uQENBFeWbZ4BCADB6a8oiF2royWbvwmujBxSmD68QWziNZbSCuRs
|
||||
M4WM1iy69kspJHRwJEVIE5pkoVfV6tIcwQQ0VkJmq6Pf/pyKeMAXp0u8bp5K0mVE
|
||||
Yio1/adiLM3kX1yleoXLNUb1gNvsk6Kp6BZCUNRmjKlbKxapJKHmL+opX8UoeLeE
|
||||
KSgJNL8jvo3nRgg+wIPnVDoizz7y03F0k4SbgNGdoA/FtZs/vcSrEfzOLgI2RxQS
|
||||
dj/ePkxg9TvQygUSYgAVbYlASw6XMmd/zTjkfD9qa0l3WSejTisn85b611WryDpA
|
||||
iYkYC3GzK8g7S9VwkAbtr79cbG+1djlA4aHASpil+zR12yEhABEBAAGJAR8EGAEK
|
||||
AAkFAleWbZ4CGwwACgkQhDu/mB/Bh2LbNQgAiOOMNzmKzY4A7/ra8ppaH9oL8XIa
|
||||
WvInivOsx22K09PPuPVqi/ooBiRGyRqhdVS4ShPOoOTR5tOsdfPpEMTHnGQ1+jW+
|
||||
Tw5MXv3oMckWw3YEYptnuvon3wT4bOXLr+eYlY4Z1ONs+pAXwMiQ2zXNuKHpA2fR
|
||||
HsF8Wyw57rCVn7K5nQgZCbVxasYlzvFGnmt/itSC5w/AnIvICDOWcoGFKTieqhME
|
||||
IkCyvu+DNrMAumnD2fqF2olsM4IzCEPSMEQqJIGzZTtQTseS8NSDioRGnG1AJQ94
|
||||
BssQVmTh0/hlpoTqXY803lR5wb1fr3RRnkOu+lbEI6AAUj51j5TAAo/1dA==
|
||||
=bvcV
|
||||
-----END PGP PUBLIC KEY BLOCK-----
|
||||
Binary file not shown.
@ -0,0 +1,26 @@
|
||||
#!/bin/sh
|
||||
# Regenerate the modern-GnuPG keyring fixtures from the committed binary
|
||||
# keyrings. Requires GnuPG 2.1+ (keybox support).
|
||||
#
|
||||
# helm-test-key.kbx keybox (pubring.kbx) containing the helm-test key
|
||||
# helm-mixed-keyring.kbx keybox containing the RSA and Ed25519 test keys
|
||||
# helm-test-key.asc ASCII-armored export of the helm-test key
|
||||
# helm-mixed-keyring.asc two concatenated single-key armored exports
|
||||
set -e
|
||||
|
||||
GNUPGHOME=$(mktemp -d)
|
||||
export GNUPGHOME
|
||||
chmod 700 "$GNUPGHOME"
|
||||
gpg --batch --no-tty --quiet --import helm-test-key.pub
|
||||
cp "$GNUPGHOME/pubring.kbx" helm-test-key.kbx
|
||||
gpg --batch --no-tty --export --armor helm-testing@helm.sh > helm-test-key.asc
|
||||
rm -rf "$GNUPGHOME"
|
||||
|
||||
GNUPGHOME=$(mktemp -d)
|
||||
export GNUPGHOME
|
||||
chmod 700 "$GNUPGHOME"
|
||||
gpg --batch --no-tty --quiet --import helm-mixed-keyring.pub
|
||||
cp "$GNUPGHOME/pubring.kbx" helm-mixed-keyring.kbx
|
||||
gpg --batch --no-tty --export --armor helm-testing@helm.sh > helm-mixed-keyring.asc
|
||||
gpg --batch --no-tty --export --armor helm-ed25519@helm.sh >> helm-mixed-keyring.asc
|
||||
rm -rf "$GNUPGHOME"
|
||||
Loading…
Reference in new issue