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plugin/discovery: Use GPG keys from Registry

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When verifying the signature of the SHA256SUMS file, we have been
hardcoding HashiCorp's public GPG key and using it as the keyring.

Going forward, Terraform will get a list of valid public keys for a
provider from the Terraform Registry (registry.terraform.io), and use
them as the keyring for the openpgp verification func.
pull/19389/head
Justin Campbell 8 years ago
parent 17787c943a
commit 495826444b
6 changed files with 174 additions and 59 deletions
Show Stats Download Patch File Download Diff File

48
plugin/discovery/get.go
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@ -15,7 +15,6 @@ import (
getter "github.com/hashicorp/go-getter"
multierror "github.com/hashicorp/go-multierror"
"github.com/hashicorp/terraform/httpclient"
"github.com/hashicorp/terraform/registry"
"github.com/hashicorp/terraform/registry/regsrc"
@ -353,12 +352,36 @@ func (i *ProviderInstaller) PurgeUnused(used map[string]PluginMeta) (PluginMetaS
}
func (i *ProviderInstaller) getProviderChecksum(urls *response.TerraformProviderPlatformLocation) (string, error) {
checksums, err := getPluginSHA256SUMs(urls.ShasumsURL, urls.ShasumsSignatureURL)
// Get SHA256SUMS file.
shasums, err := getFile(urls.ShasumsURL)
if err != nil {
return "", fmt.Errorf("error fetching checksums: %s", err)
}
// Get SHA256SUMS.sig file.
signature, err := getFile(urls.ShasumsSignatureURL)
if err != nil {
return "", fmt.Errorf("error fetching checksums signature: %s", err)
}
// Verify GPG signature.
asciiArmor := urls.SigningKeys.GPGASCIIArmor()
signer, err := verifySig(shasums, signature, asciiArmor)
if err != nil {
return "", err
}
return checksumForFile(checksums, urls.Filename), nil
// Display identity for GPG key which succeeded verifying the signature.
// This could also be used to display to the user with i.Ui.Info().
identities := []string{}
for k, _ := range signer.Identities {
identities = append(identities, k)
}
identity := strings.Join(identities, ", ")
log.Printf("[DEBUG] verified GPG signature with key from %s", identity)
// Extract checksum for this os/arch platform binary.
return checksumForFile(shasums, urls.Filename), nil
}
// list all versions available for the named provider
@ -487,25 +510,6 @@ func checksumForFile(sums []byte, name string) string {
return ""
}
// fetch the SHA256SUMS file provided, and verify its signature.
func getPluginSHA256SUMs(sumsURL, sigURL string) ([]byte, error) {
sums, err := getFile(sumsURL)
if err != nil {
return nil, fmt.Errorf("error fetching checksums: %s", err)
}
sig, err := getFile(sigURL)
if err != nil {
return nil, fmt.Errorf("error fetching checksums signature: %s", err)
}
if err := verifySig(sums, sig); err != nil {
return nil, err
}
return sums, nil
}
func getFile(url string) ([]byte, error) {
resp, err := httpClient.Get(url)
if err != nil {

36
plugin/discovery/get_test.go
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@ -369,23 +369,57 @@ func TestProviderInstallerPurgeUnused(t *testing.T) {
// Test fetching a provider's checksum file while verifying its signature.
func TestProviderChecksum(t *testing.T) {
hashicorpKey, err := ioutil.ReadFile("testdata/hashicorp.asc")
if err != nil {
t.Fatal(err)
}
tests := []struct {
Name string
URLs *response.TerraformProviderPlatformLocation
Err bool
}{
{
"good",
&response.TerraformProviderPlatformLocation{
Filename: "terraform-provider-template_0.1.0_darwin_amd64.zip",
ShasumsURL: "http://127.0.0.1:8080/terraform-provider-template/0.1.0/terraform-provider-template_0.1.0_SHA256SUMS",
ShasumsSignatureURL: "http://127.0.0.1:8080/terraform-provider-template/0.1.0/terraform-provider-template_0.1.0_SHA256SUMS.sig",
Filename: "terraform-provider-template_0.1.0_darwin_amd64.zip",
SigningKeys: response.SigningKeyList{
GPGKeys: []*response.GPGKey{
&response.GPGKey{
ASCIIArmor: string(hashicorpKey),
},
},
},
},
false,
},
{
"bad",
&response.TerraformProviderPlatformLocation{
Filename: "terraform-provider-template_0.1.0_darwin_amd64.zip",
ShasumsURL: "http://127.0.0.1:8080/terraform-provider-badsig/0.1.0/terraform-provider-badsig_0.1.0_SHA256SUMS",
ShasumsSignatureURL: "http://127.0.0.1:8080/terraform-provider-badsig/0.1.0/terraform-provider-badsig_0.1.0_SHA256SUMS.sig",
SigningKeys: response.SigningKeyList{
GPGKeys: []*response.GPGKey{
&response.GPGKey{
ASCIIArmor: string(hashicorpKey),
},
},
},
},
true,
},
{
"no keys",
&response.TerraformProviderPlatformLocation{
Filename: "terraform-provider-template_0.1.0_darwin_amd64.zip",
ShasumsURL: "http://127.0.0.1:8080/terraform-provider-template/0.1.0/terraform-provider-template_0.1.0_SHA256SUMS",
ShasumsSignatureURL: "http://127.0.0.1:8080/terraform-provider-template/0.1.0/terraform-provider-template_0.1.0_SHA256SUMS.sig",
SigningKeys: response.SigningKeyList{
GPGKeys: []*response.GPGKey{},
},
},
true,
},

39
plugin/discovery/signature.go
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@ -10,44 +10,11 @@ import (
// Verify the data using the provided openpgp detached signature and the
// embedded hashicorp public key.
func verifySig(data, sig []byte) error {
el, err := openpgp.ReadArmoredKeyRing(strings.NewReader(hashiPublicKey))
func verifySig(data, sig []byte, armor string) (*openpgp.Entity, error) {
el, err := openpgp.ReadArmoredKeyRing(strings.NewReader(armor))
if err != nil {
log.Fatal(err)
}
_, err = openpgp.CheckDetachedSignature(el, bytes.NewReader(data), bytes.NewReader(sig))
return err
return openpgp.CheckDetachedSignature(el, bytes.NewReader(data), bytes.NewReader(sig))
}
// this is the public key that signs the checksums file for releases.
const hashiPublicKey = `-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1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=LYpS
-----END PGP PUBLIC KEY BLOCK-----`

30
plugin/discovery/testdata/hashicorp.asc vendored
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@ -0,0 +1,30 @@
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1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=LYpS
-----END PGP PUBLIC KEY BLOCK-----

28
registry/response/terraform_provider.go
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@ -2,6 +2,7 @@ package response
import (
"sort"
"strings"
version "github.com/hashicorp/go-version"
)
@ -50,11 +51,38 @@ type TerraformProviderPlatformLocation struct {
DownloadURL string `json:"download_url"`
ShasumsURL string `json:"shasums_url"`
ShasumsSignatureURL string `json:"shasums_signature_url"`
Shasum string `json:"shasum"`
SigningKeys SigningKeyList `json:"signing_keys"`
}
// SigningKeyList is the response structure for a list of signing keys.
type SigningKeyList struct {
GPGKeys []*GPGKey `json:"gpg_public_keys"`
}
// GPGKey is the response structure for a GPG key.
type GPGKey struct {
ASCIIArmor string `json:"ascii_armor"`
Source string `json:"source"`
SourceURL *string `json:"source_url"`
}
// Collection type for TerraformProviderVersion
type ProviderVersionCollection []*TerraformProviderVersion
// GPGASCIIArmor returns an ASCII-armor-formatted string for all of the gpg
// keys in the response.
func (signingKeys *SigningKeyList) GPGASCIIArmor() string {
keys := []string{}
for _, gpgKey := range signingKeys.GPGKeys {
keys = append(keys, gpgKey.ASCIIArmor)
}
return strings.Join(keys, "\n")
}
// Sort sorts versions from newest to oldest.
func (v ProviderVersionCollection) Sort() {
sort.Slice(v, func(i, j int) bool {

52
registry/response/terraform_provider_test.go
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@ -0,0 +1,52 @@
package response
import (
"fmt"
"testing"
)
var (
testGPGKeyOne = &GPGKey{
ASCIIArmor: "---\none\n---",
}
testGPGKeyTwo = &GPGKey{
ASCIIArmor: "---\ntwo\n---",
}
)
func TestSigningKeyList_GPGASCIIArmor(t *testing.T) {
var tests = []struct {
name string
gpgKeys []*GPGKey
expected string
}{
{
name: "no keys",
gpgKeys: []*GPGKey{},
expected: "",
},
{
name: "one key",
gpgKeys: []*GPGKey{testGPGKeyOne},
expected: testGPGKeyOne.ASCIIArmor,
},
{
name: "two keys",
gpgKeys: []*GPGKey{testGPGKeyOne, testGPGKeyTwo},
expected: fmt.Sprintf("%s\n%s",
testGPGKeyOne.ASCIIArmor, testGPGKeyTwo.ASCIIArmor),
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
signingKeys := &SigningKeyList{
GPGKeys: tt.gpgKeys,
}
actual := signingKeys.GPGASCIIArmor()
if actual != tt.expected {
t.Errorf("expected %s, got %s", tt.expected, actual)
}
})
}
}
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