368 lines
10 KiB
Go
368 lines
10 KiB
Go
// Copyright (C) 2018 Storj Labs, Inc.
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// See LICENSE for copying information.
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package identity
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import (
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"bytes"
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"context"
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"crypto"
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"crypto/ecdsa"
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"crypto/sha256"
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"crypto/tls"
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"crypto/x509"
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"fmt"
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"io/ioutil"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"github.com/zeebo/errs"
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"google.golang.org/grpc"
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"google.golang.org/grpc/credentials"
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"google.golang.org/grpc/peer"
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"storj.io/storj/pkg/peertls"
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"storj.io/storj/pkg/storj"
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"storj.io/storj/pkg/utils"
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)
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// PeerIdentity represents another peer on the network.
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type PeerIdentity struct {
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RestChain []*x509.Certificate
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// CA represents the peer's self-signed CA
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CA *x509.Certificate
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// Leaf represents the leaf they're currently using. The leaf should be
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// signed by the CA. The leaf is what is used for communication.
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Leaf *x509.Certificate
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// The ID taken from the CA public key
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ID storj.NodeID
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}
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// FullIdentity represents you on the network. In addition to a PeerIdentity,
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// a FullIdentity also has a Key, which a PeerIdentity doesn't have.
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type FullIdentity struct {
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RestChain []*x509.Certificate
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// CA represents the peer's self-signed CA. The ID is taken from this cert.
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CA *x509.Certificate
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// Leaf represents the leaf they're currently using. The leaf should be
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// signed by the CA. The leaf is what is used for communication.
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Leaf *x509.Certificate
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// The ID taken from the CA public key
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ID storj.NodeID
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// Key is the key this identity uses with the leaf for communication.
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Key crypto.PrivateKey
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}
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// SetupConfig allows you to run a set of Responsibilities with the given
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// identity. You can also just load an Identity from disk.
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type SetupConfig struct {
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CertPath string `help:"path to the certificate chain for this identity" default:"$CONFDIR/identity.cert"`
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KeyPath string `help:"path to the private key for this identity" default:"$CONFDIR/identity.key"`
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Overwrite bool `help:"if true, existing identity certs AND keys will overwritten for" default:"false"`
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Version string `help:"semantic version of identity storage format" default:"0"`
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}
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// Config allows you to run a set of Responsibilities with the given
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// identity. You can also just load an Identity from disk.
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type Config struct {
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CertPath string `help:"path to the certificate chain for this identity" default:"$CONFDIR/identity.cert"`
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KeyPath string `help:"path to the private key for this identity" default:"$CONFDIR/identity.key"`
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}
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// FullIdentityFromPEM loads a FullIdentity from a certificate chain and
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// private key PEM-encoded bytes
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func FullIdentityFromPEM(chainPEM, keyPEM []byte) (*FullIdentity, error) {
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chain, err := DecodeAndParseChainPEM(chainPEM)
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if err != nil {
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return nil, errs.Wrap(err)
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}
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if len(chain) < peertls.CAIndex+1 {
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return nil, ErrChainLength.New("identity chain does not contain a CA certificate")
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}
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keysBytes, err := decodePEM(keyPEM)
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if err != nil {
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return nil, errs.Wrap(err)
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}
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// NB: there shouldn't be multiple keys in the key file but if there
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// are, this uses the first one
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key, err := x509.ParseECPrivateKey(keysBytes[0])
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if err != nil {
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return nil, errs.New("unable to parse EC private key: %v", err)
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}
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nodeID, err := NodeIDFromKey(chain[peertls.CAIndex].PublicKey)
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if err != nil {
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return nil, err
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}
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return &FullIdentity{
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RestChain: chain[peertls.CAIndex+1:],
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CA: chain[peertls.CAIndex],
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Leaf: chain[peertls.LeafIndex],
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Key: key,
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ID: nodeID,
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}, nil
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}
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// ParseCertChain converts a chain of certificate bytes into x509 certs
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func ParseCertChain(chain [][]byte) ([]*x509.Certificate, error) {
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c := make([]*x509.Certificate, len(chain))
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for i, ct := range chain {
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cp, err := x509.ParseCertificate(ct)
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if err != nil {
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return nil, errs.Wrap(err)
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}
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c[i] = cp
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}
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return c, nil
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}
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// PeerIdentityFromCerts loads a PeerIdentity from a pair of leaf and ca x509 certificates
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func PeerIdentityFromCerts(leaf, ca *x509.Certificate, rest []*x509.Certificate) (*PeerIdentity, error) {
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i, err := NodeIDFromKey(ca.PublicKey)
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if err != nil {
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return nil, err
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}
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return &PeerIdentity{
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RestChain: rest,
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CA: ca,
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ID: i,
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Leaf: leaf,
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}, nil
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}
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// PeerIdentityFromPeer loads a PeerIdentity from a peer connection
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func PeerIdentityFromPeer(peer *peer.Peer) (*PeerIdentity, error) {
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tlsInfo := peer.AuthInfo.(credentials.TLSInfo)
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c := tlsInfo.State.PeerCertificates
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if len(c) < 2 {
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return nil, Error.New("invalid certificate chain")
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}
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pi, err := PeerIdentityFromCerts(c[peertls.LeafIndex], c[peertls.CAIndex], c[2:])
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if err != nil {
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return nil, err
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}
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return pi, nil
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}
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// PeerIdentityFromContext loads a PeerIdentity from a ctx TLS credentials
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func PeerIdentityFromContext(ctx context.Context) (*PeerIdentity, error) {
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p, ok := peer.FromContext(ctx)
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if !ok {
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return nil, Error.New("unable to get grpc peer from contex")
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}
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return PeerIdentityFromPeer(p)
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}
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// NodeIDFromKey hashes a public key and creates a node ID from it
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func NodeIDFromKey(k crypto.PublicKey) (storj.NodeID, error) {
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if ek, ok := k.(*ecdsa.PublicKey); ok {
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return NodeIDFromECDSAKey(ek)
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}
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return storj.NodeID{}, storj.ErrNodeID.New("invalid key type: %T", k)
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}
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// NodeIDFromECDSAKey hashes a public key and creates a node ID from it
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func NodeIDFromECDSAKey(k *ecdsa.PublicKey) (storj.NodeID, error) {
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// id = sha256(sha256(pkix(k)))
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kb, err := x509.MarshalPKIXPublicKey(k)
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if err != nil {
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return storj.NodeID{}, storj.ErrNodeID.Wrap(err)
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}
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mid := sha256.Sum256(kb)
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end := sha256.Sum256(mid[:])
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return storj.NodeIDFromBytes(end[:])
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}
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// NewFullIdentity creates a new ID for nodes with difficulty and concurrency params
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func NewFullIdentity(ctx context.Context, difficulty uint16, concurrency uint) (*FullIdentity, error) {
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ca, err := NewCA(ctx, NewCAOptions{
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Difficulty: difficulty,
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Concurrency: concurrency,
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})
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if err != nil {
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return nil, err
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}
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identity, err := ca.NewIdentity()
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if err != nil {
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return nil, err
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}
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return identity, err
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}
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// Status returns the status of the identity cert/key files for the config
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func (is SetupConfig) Status() TLSFilesStatus {
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return statTLSFiles(is.CertPath, is.KeyPath)
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}
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// Create generates and saves a CA using the config
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func (is SetupConfig) Create(ca *FullCertificateAuthority) (*FullIdentity, error) {
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fi, err := ca.NewIdentity()
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if err != nil {
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return nil, err
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}
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fi.CA = ca.Cert
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ic := Config{
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CertPath: is.CertPath,
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KeyPath: is.KeyPath,
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}
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return fi, ic.Save(fi)
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}
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// FullConfig converts a `SetupConfig` to `Config`
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func (is SetupConfig) FullConfig() Config {
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return Config{
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CertPath: is.CertPath,
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KeyPath: is.KeyPath,
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}
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}
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// Load loads a FullIdentity from the config
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func (ic Config) Load() (*FullIdentity, error) {
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c, err := ioutil.ReadFile(ic.CertPath)
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if err != nil {
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return nil, peertls.ErrNotExist.Wrap(err)
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}
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k, err := ioutil.ReadFile(ic.KeyPath)
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if err != nil {
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return nil, peertls.ErrNotExist.Wrap(err)
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}
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fi, err := FullIdentityFromPEM(c, k)
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if err != nil {
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return nil, errs.New("failed to load identity %#v, %#v: %v",
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ic.CertPath, ic.KeyPath, err)
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}
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return fi, nil
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}
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// Save saves a FullIdentity according to the config
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func (ic Config) Save(fi *FullIdentity) error {
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var (
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certData, keyData bytes.Buffer
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writeChainErr, writeChainDataErr, writeKeyErr, writeKeyDataErr error
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)
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chain := []*x509.Certificate{fi.Leaf, fi.CA}
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chain = append(chain, fi.RestChain...)
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if ic.CertPath != "" {
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writeChainErr = peertls.WriteChain(&certData, chain...)
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writeChainDataErr = writeChainData(ic.CertPath, certData.Bytes())
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}
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if ic.KeyPath != "" {
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writeKeyErr = peertls.WriteKey(&keyData, fi.Key)
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writeKeyDataErr = writeKeyData(ic.KeyPath, keyData.Bytes())
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}
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writeErr := utils.CombineErrors(writeChainErr, writeKeyErr)
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if writeErr != nil {
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return writeErr
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}
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return utils.CombineErrors(
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writeChainDataErr,
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writeKeyDataErr,
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)
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}
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// SaveBackup saves the certificate of the config with a timestamped filename
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func (ic Config) SaveBackup(fi *FullIdentity) error {
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return Config{
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CertPath: backupPath(ic.CertPath),
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}.Save(fi)
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}
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// RestChainRaw returns the rest (excluding leaf and CA) of the certificate chain as a 2d byte slice
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func (fi *FullIdentity) RestChainRaw() [][]byte {
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var chain [][]byte
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for _, cert := range fi.RestChain {
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chain = append(chain, cert.Raw)
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}
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return chain
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}
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// ServerOption returns a grpc `ServerOption` for incoming connections
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// to the node with this full identity
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func (fi *FullIdentity) ServerOption(pcvFuncs ...peertls.PeerCertVerificationFunc) (grpc.ServerOption, error) {
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ch := [][]byte{fi.Leaf.Raw, fi.CA.Raw}
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ch = append(ch, fi.RestChainRaw()...)
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c, err := peertls.TLSCert(ch, fi.Leaf, fi.Key)
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if err != nil {
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return nil, err
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}
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pcvFuncs = append(
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[]peertls.PeerCertVerificationFunc{peertls.VerifyPeerCertChains},
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pcvFuncs...,
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)
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tlsConfig := &tls.Config{
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Certificates: []tls.Certificate{*c},
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InsecureSkipVerify: true,
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ClientAuth: tls.RequireAnyClientCert,
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VerifyPeerCertificate: peertls.VerifyPeerFunc(
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pcvFuncs...,
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),
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}
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return grpc.Creds(credentials.NewTLS(tlsConfig)), nil
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}
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// DialOption returns a grpc `DialOption` for making outgoing connections
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// to the node with this peer identity
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// id is an optional id of the node we are dialing
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func (fi *FullIdentity) DialOption(id storj.NodeID) (grpc.DialOption, error) {
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ch := [][]byte{fi.Leaf.Raw, fi.CA.Raw}
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ch = append(ch, fi.RestChainRaw()...)
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c, err := peertls.TLSCert(ch, fi.Leaf, fi.Key)
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if err != nil {
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return nil, err
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}
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tlsConfig := &tls.Config{
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Certificates: []tls.Certificate{*c},
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InsecureSkipVerify: true,
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VerifyPeerCertificate: peertls.VerifyPeerFunc(
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peertls.VerifyPeerCertChains,
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verifyIdentity(id),
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),
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}
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return grpc.WithTransportCredentials(credentials.NewTLS(tlsConfig)), nil
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}
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func verifyIdentity(id storj.NodeID) peertls.PeerCertVerificationFunc {
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return func(_ [][]byte, parsedChains [][]*x509.Certificate) (err error) {
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defer mon.TaskNamed("verifyIdentity")(nil)(&err)
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if id == (storj.NodeID{}) {
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return nil
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}
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peer, err := PeerIdentityFromCerts(parsedChains[0][0], parsedChains[0][1], parsedChains[0][2:])
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if err != nil {
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return err
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}
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if peer.ID.String() != id.String() {
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return Error.New("peer ID did not match requested ID")
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}
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return nil
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}
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}
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func backupPath(path string) string {
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pathExt := filepath.Ext(path)
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base := strings.TrimSuffix(path, pathExt)
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return fmt.Sprintf(
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"%s.%s%s",
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base,
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strconv.Itoa(int(time.Now().Unix())),
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pathExt,
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)
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}
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