mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2025-11-04 09:32:25 -06:00
98263a7de6* start fixing up tests * fix up tests + automate with drone * fiddle with linting * messing about with drone.yml * some more fiddling * hmmm * add cache * add vendor directory * verbose * ci updates * update some little things * update sig
532 lines
14 KiB
Go
532 lines
14 KiB
Go
package httpsig
|
|
|
|
import (
|
|
"crypto"
|
|
"crypto/ecdsa"
|
|
"crypto/hmac"
|
|
"crypto/rsa"
|
|
"crypto/sha1"
|
|
"crypto/sha256"
|
|
"crypto/sha512"
|
|
"crypto/subtle" // Use should trigger great care
|
|
"encoding/asn1"
|
|
"errors"
|
|
"fmt"
|
|
"hash"
|
|
"io"
|
|
"math/big"
|
|
"strings"
|
|
|
|
"golang.org/x/crypto/blake2b"
|
|
"golang.org/x/crypto/blake2s"
|
|
"golang.org/x/crypto/ed25519"
|
|
"golang.org/x/crypto/ripemd160"
|
|
"golang.org/x/crypto/sha3"
|
|
"golang.org/x/crypto/ssh"
|
|
)
|
|
|
|
const (
|
|
hmacPrefix = "hmac"
|
|
rsaPrefix = "rsa"
|
|
sshPrefix = "ssh"
|
|
ecdsaPrefix = "ecdsa"
|
|
ed25519Prefix = "ed25519"
|
|
md4String = "md4"
|
|
md5String = "md5"
|
|
sha1String = "sha1"
|
|
sha224String = "sha224"
|
|
sha256String = "sha256"
|
|
sha384String = "sha384"
|
|
sha512String = "sha512"
|
|
md5sha1String = "md5sha1"
|
|
ripemd160String = "ripemd160"
|
|
sha3_224String = "sha3-224"
|
|
sha3_256String = "sha3-256"
|
|
sha3_384String = "sha3-384"
|
|
sha3_512String = "sha3-512"
|
|
sha512_224String = "sha512-224"
|
|
sha512_256String = "sha512-256"
|
|
blake2s_256String = "blake2s-256"
|
|
blake2b_256String = "blake2b-256"
|
|
blake2b_384String = "blake2b-384"
|
|
blake2b_512String = "blake2b-512"
|
|
)
|
|
|
|
var blake2Algorithms = map[crypto.Hash]bool{
|
|
crypto.BLAKE2s_256: true,
|
|
crypto.BLAKE2b_256: true,
|
|
crypto.BLAKE2b_384: true,
|
|
crypto.BLAKE2b_512: true,
|
|
}
|
|
|
|
var hashToDef = map[crypto.Hash]struct {
|
|
name string
|
|
new func(key []byte) (hash.Hash, error) // Only MACers will accept a key
|
|
}{
|
|
// Which standard names these?
|
|
// The spec lists the following as a canonical reference, which is dead:
|
|
// http://www.iana.org/assignments/signature-algorithms
|
|
//
|
|
// Note that the forbidden hashes have an invalid 'new' function.
|
|
crypto.MD4: {md4String, func(key []byte) (hash.Hash, error) { return nil, nil }},
|
|
crypto.MD5: {md5String, func(key []byte) (hash.Hash, error) { return nil, nil }},
|
|
// Temporarily enable SHA1 because of issue https://github.com/golang/go/issues/37278
|
|
crypto.SHA1: {sha1String, func(key []byte) (hash.Hash, error) { return sha1.New(), nil }},
|
|
crypto.SHA224: {sha224String, func(key []byte) (hash.Hash, error) { return sha256.New224(), nil }},
|
|
crypto.SHA256: {sha256String, func(key []byte) (hash.Hash, error) { return sha256.New(), nil }},
|
|
crypto.SHA384: {sha384String, func(key []byte) (hash.Hash, error) { return sha512.New384(), nil }},
|
|
crypto.SHA512: {sha512String, func(key []byte) (hash.Hash, error) { return sha512.New(), nil }},
|
|
crypto.MD5SHA1: {md5sha1String, func(key []byte) (hash.Hash, error) { return nil, nil }},
|
|
crypto.RIPEMD160: {ripemd160String, func(key []byte) (hash.Hash, error) { return ripemd160.New(), nil }},
|
|
crypto.SHA3_224: {sha3_224String, func(key []byte) (hash.Hash, error) { return sha3.New224(), nil }},
|
|
crypto.SHA3_256: {sha3_256String, func(key []byte) (hash.Hash, error) { return sha3.New256(), nil }},
|
|
crypto.SHA3_384: {sha3_384String, func(key []byte) (hash.Hash, error) { return sha3.New384(), nil }},
|
|
crypto.SHA3_512: {sha3_512String, func(key []byte) (hash.Hash, error) { return sha3.New512(), nil }},
|
|
crypto.SHA512_224: {sha512_224String, func(key []byte) (hash.Hash, error) { return sha512.New512_224(), nil }},
|
|
crypto.SHA512_256: {sha512_256String, func(key []byte) (hash.Hash, error) { return sha512.New512_256(), nil }},
|
|
crypto.BLAKE2s_256: {blake2s_256String, func(key []byte) (hash.Hash, error) { return blake2s.New256(key) }},
|
|
crypto.BLAKE2b_256: {blake2b_256String, func(key []byte) (hash.Hash, error) { return blake2b.New256(key) }},
|
|
crypto.BLAKE2b_384: {blake2b_384String, func(key []byte) (hash.Hash, error) { return blake2b.New384(key) }},
|
|
crypto.BLAKE2b_512: {blake2b_512String, func(key []byte) (hash.Hash, error) { return blake2b.New512(key) }},
|
|
}
|
|
|
|
var stringToHash map[string]crypto.Hash
|
|
|
|
const (
|
|
defaultAlgorithm = RSA_SHA256
|
|
defaultAlgorithmHashing = sha256String
|
|
)
|
|
|
|
func init() {
|
|
stringToHash = make(map[string]crypto.Hash, len(hashToDef))
|
|
for k, v := range hashToDef {
|
|
stringToHash[v.name] = k
|
|
}
|
|
// This should guarantee that at runtime the defaultAlgorithm will not
|
|
// result in errors when fetching a macer or signer (see algorithms.go)
|
|
if ok, err := isAvailable(string(defaultAlgorithmHashing)); err != nil {
|
|
panic(err)
|
|
} else if !ok {
|
|
panic(fmt.Sprintf("the default httpsig algorithm is unavailable: %q", defaultAlgorithm))
|
|
}
|
|
}
|
|
|
|
func isForbiddenHash(h crypto.Hash) bool {
|
|
switch h {
|
|
// Not actually cryptographically secure
|
|
case crypto.MD4:
|
|
fallthrough
|
|
case crypto.MD5:
|
|
fallthrough
|
|
case crypto.MD5SHA1: // shorthand for crypto/tls, not actually implemented
|
|
return true
|
|
}
|
|
// Still cryptographically secure
|
|
return false
|
|
}
|
|
|
|
// signer is an internally public type.
|
|
type signer interface {
|
|
Sign(rand io.Reader, p crypto.PrivateKey, sig []byte) ([]byte, error)
|
|
Verify(pub crypto.PublicKey, toHash, signature []byte) error
|
|
String() string
|
|
}
|
|
|
|
// macer is an internally public type.
|
|
type macer interface {
|
|
Sign(sig, key []byte) ([]byte, error)
|
|
Equal(sig, actualMAC, key []byte) (bool, error)
|
|
String() string
|
|
}
|
|
|
|
var _ macer = &hmacAlgorithm{}
|
|
|
|
type hmacAlgorithm struct {
|
|
fn func(key []byte) (hash.Hash, error)
|
|
kind crypto.Hash
|
|
}
|
|
|
|
func (h *hmacAlgorithm) Sign(sig, key []byte) ([]byte, error) {
|
|
hs, err := h.fn(key)
|
|
if err = setSig(hs, sig); err != nil {
|
|
return nil, err
|
|
}
|
|
return hs.Sum(nil), nil
|
|
}
|
|
|
|
func (h *hmacAlgorithm) Equal(sig, actualMAC, key []byte) (bool, error) {
|
|
hs, err := h.fn(key)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
defer hs.Reset()
|
|
err = setSig(hs, sig)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
expected := hs.Sum(nil)
|
|
return hmac.Equal(actualMAC, expected), nil
|
|
}
|
|
|
|
func (h *hmacAlgorithm) String() string {
|
|
return fmt.Sprintf("%s-%s", hmacPrefix, hashToDef[h.kind].name)
|
|
}
|
|
|
|
var _ signer = &rsaAlgorithm{}
|
|
|
|
type rsaAlgorithm struct {
|
|
hash.Hash
|
|
kind crypto.Hash
|
|
sshSigner ssh.Signer
|
|
}
|
|
|
|
func (r *rsaAlgorithm) setSig(b []byte) error {
|
|
n, err := r.Write(b)
|
|
if err != nil {
|
|
r.Reset()
|
|
return err
|
|
} else if n != len(b) {
|
|
r.Reset()
|
|
return fmt.Errorf("could only write %d of %d bytes of signature to hash", n, len(b))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (r *rsaAlgorithm) Sign(rand io.Reader, p crypto.PrivateKey, sig []byte) ([]byte, error) {
|
|
if r.sshSigner != nil {
|
|
sshsig, err := r.sshSigner.Sign(rand, sig)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return sshsig.Blob, nil
|
|
}
|
|
defer r.Reset()
|
|
|
|
if err := r.setSig(sig); err != nil {
|
|
return nil, err
|
|
}
|
|
rsaK, ok := p.(*rsa.PrivateKey)
|
|
if !ok {
|
|
return nil, errors.New("crypto.PrivateKey is not *rsa.PrivateKey")
|
|
}
|
|
return rsa.SignPKCS1v15(rand, rsaK, r.kind, r.Sum(nil))
|
|
}
|
|
|
|
func (r *rsaAlgorithm) Verify(pub crypto.PublicKey, toHash, signature []byte) error {
|
|
defer r.Reset()
|
|
rsaK, ok := pub.(*rsa.PublicKey)
|
|
if !ok {
|
|
return errors.New("crypto.PublicKey is not *rsa.PublicKey")
|
|
}
|
|
if err := r.setSig(toHash); err != nil {
|
|
return err
|
|
}
|
|
return rsa.VerifyPKCS1v15(rsaK, r.kind, r.Sum(nil), signature)
|
|
}
|
|
|
|
func (r *rsaAlgorithm) String() string {
|
|
return fmt.Sprintf("%s-%s", rsaPrefix, hashToDef[r.kind].name)
|
|
}
|
|
|
|
var _ signer = &ed25519Algorithm{}
|
|
|
|
type ed25519Algorithm struct {
|
|
sshSigner ssh.Signer
|
|
}
|
|
|
|
func (r *ed25519Algorithm) Sign(rand io.Reader, p crypto.PrivateKey, sig []byte) ([]byte, error) {
|
|
if r.sshSigner != nil {
|
|
sshsig, err := r.sshSigner.Sign(rand, sig)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return sshsig.Blob, nil
|
|
}
|
|
ed25519K, ok := p.(ed25519.PrivateKey)
|
|
if !ok {
|
|
return nil, errors.New("crypto.PrivateKey is not ed25519.PrivateKey")
|
|
}
|
|
return ed25519.Sign(ed25519K, sig), nil
|
|
}
|
|
|
|
func (r *ed25519Algorithm) Verify(pub crypto.PublicKey, toHash, signature []byte) error {
|
|
ed25519K, ok := pub.(ed25519.PublicKey)
|
|
if !ok {
|
|
return errors.New("crypto.PublicKey is not ed25519.PublicKey")
|
|
}
|
|
|
|
if ed25519.Verify(ed25519K, toHash, signature) {
|
|
return nil
|
|
}
|
|
|
|
return errors.New("ed25519 verify failed")
|
|
}
|
|
|
|
func (r *ed25519Algorithm) String() string {
|
|
return fmt.Sprintf("%s", ed25519Prefix)
|
|
}
|
|
|
|
var _ signer = &ecdsaAlgorithm{}
|
|
|
|
type ecdsaAlgorithm struct {
|
|
hash.Hash
|
|
kind crypto.Hash
|
|
}
|
|
|
|
func (r *ecdsaAlgorithm) setSig(b []byte) error {
|
|
n, err := r.Write(b)
|
|
if err != nil {
|
|
r.Reset()
|
|
return err
|
|
} else if n != len(b) {
|
|
r.Reset()
|
|
return fmt.Errorf("could only write %d of %d bytes of signature to hash", n, len(b))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
type ECDSASignature struct {
|
|
R, S *big.Int
|
|
}
|
|
|
|
func (r *ecdsaAlgorithm) Sign(rand io.Reader, p crypto.PrivateKey, sig []byte) ([]byte, error) {
|
|
defer r.Reset()
|
|
if err := r.setSig(sig); err != nil {
|
|
return nil, err
|
|
}
|
|
ecdsaK, ok := p.(*ecdsa.PrivateKey)
|
|
if !ok {
|
|
return nil, errors.New("crypto.PrivateKey is not *ecdsa.PrivateKey")
|
|
}
|
|
R, S, err := ecdsa.Sign(rand, ecdsaK, r.Sum(nil))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
signature := ECDSASignature{R: R, S: S}
|
|
bytes, err := asn1.Marshal(signature)
|
|
|
|
return bytes, err
|
|
}
|
|
|
|
func (r *ecdsaAlgorithm) Verify(pub crypto.PublicKey, toHash, signature []byte) error {
|
|
defer r.Reset()
|
|
ecdsaK, ok := pub.(*ecdsa.PublicKey)
|
|
if !ok {
|
|
return errors.New("crypto.PublicKey is not *ecdsa.PublicKey")
|
|
}
|
|
if err := r.setSig(toHash); err != nil {
|
|
return err
|
|
}
|
|
|
|
sig := new(ECDSASignature)
|
|
_, err := asn1.Unmarshal(signature, sig)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if ecdsa.Verify(ecdsaK, r.Sum(nil), sig.R, sig.S) {
|
|
return nil
|
|
} else {
|
|
return errors.New("Invalid signature")
|
|
}
|
|
}
|
|
|
|
func (r *ecdsaAlgorithm) String() string {
|
|
return fmt.Sprintf("%s-%s", ecdsaPrefix, hashToDef[r.kind].name)
|
|
}
|
|
|
|
var _ macer = &blakeMacAlgorithm{}
|
|
|
|
type blakeMacAlgorithm struct {
|
|
fn func(key []byte) (hash.Hash, error)
|
|
kind crypto.Hash
|
|
}
|
|
|
|
func (r *blakeMacAlgorithm) Sign(sig, key []byte) ([]byte, error) {
|
|
hs, err := r.fn(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if err = setSig(hs, sig); err != nil {
|
|
return nil, err
|
|
}
|
|
return hs.Sum(nil), nil
|
|
}
|
|
|
|
func (r *blakeMacAlgorithm) Equal(sig, actualMAC, key []byte) (bool, error) {
|
|
hs, err := r.fn(key)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
defer hs.Reset()
|
|
err = setSig(hs, sig)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
expected := hs.Sum(nil)
|
|
return subtle.ConstantTimeCompare(actualMAC, expected) == 1, nil
|
|
}
|
|
|
|
func (r *blakeMacAlgorithm) String() string {
|
|
return fmt.Sprintf("%s", hashToDef[r.kind].name)
|
|
}
|
|
|
|
func setSig(a hash.Hash, b []byte) error {
|
|
n, err := a.Write(b)
|
|
if err != nil {
|
|
a.Reset()
|
|
return err
|
|
} else if n != len(b) {
|
|
a.Reset()
|
|
return fmt.Errorf("could only write %d of %d bytes of signature to hash", n, len(b))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// IsSupportedHttpSigAlgorithm returns true if the string is supported by this
|
|
// library, is not a hash known to be weak, and is supported by the hardware.
|
|
func IsSupportedHttpSigAlgorithm(algo string) bool {
|
|
a, err := isAvailable(algo)
|
|
return a && err == nil
|
|
}
|
|
|
|
// isAvailable is an internally public function
|
|
func isAvailable(algo string) (bool, error) {
|
|
c, ok := stringToHash[algo]
|
|
if !ok {
|
|
return false, fmt.Errorf("no match for %q", algo)
|
|
}
|
|
if isForbiddenHash(c) {
|
|
return false, fmt.Errorf("forbidden hash type in %q", algo)
|
|
}
|
|
return c.Available(), nil
|
|
}
|
|
|
|
func newAlgorithmConstructor(algo string) (fn func(k []byte) (hash.Hash, error), c crypto.Hash, e error) {
|
|
ok := false
|
|
c, ok = stringToHash[algo]
|
|
if !ok {
|
|
e = fmt.Errorf("no match for %q", algo)
|
|
return
|
|
}
|
|
if isForbiddenHash(c) {
|
|
e = fmt.Errorf("forbidden hash type in %q", algo)
|
|
return
|
|
}
|
|
algoDef, ok := hashToDef[c]
|
|
if !ok {
|
|
e = fmt.Errorf("have crypto.Hash %v but no definition", c)
|
|
return
|
|
}
|
|
fn = func(key []byte) (hash.Hash, error) {
|
|
h, err := algoDef.new(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return h, nil
|
|
}
|
|
return
|
|
}
|
|
|
|
func newAlgorithm(algo string, key []byte) (hash.Hash, crypto.Hash, error) {
|
|
fn, c, err := newAlgorithmConstructor(algo)
|
|
if err != nil {
|
|
return nil, c, err
|
|
}
|
|
h, err := fn(key)
|
|
return h, c, err
|
|
}
|
|
|
|
func signerFromSSHSigner(sshSigner ssh.Signer, s string) (signer, error) {
|
|
switch {
|
|
case strings.HasPrefix(s, rsaPrefix):
|
|
return &rsaAlgorithm{
|
|
sshSigner: sshSigner,
|
|
}, nil
|
|
case strings.HasPrefix(s, ed25519Prefix):
|
|
return &ed25519Algorithm{
|
|
sshSigner: sshSigner,
|
|
}, nil
|
|
default:
|
|
return nil, fmt.Errorf("no signer matching %q", s)
|
|
}
|
|
}
|
|
|
|
// signerFromString is an internally public method constructor
|
|
func signerFromString(s string) (signer, error) {
|
|
s = strings.ToLower(s)
|
|
isEcdsa := false
|
|
isEd25519 := false
|
|
var algo string = ""
|
|
if strings.HasPrefix(s, ecdsaPrefix) {
|
|
algo = strings.TrimPrefix(s, ecdsaPrefix+"-")
|
|
isEcdsa = true
|
|
} else if strings.HasPrefix(s, rsaPrefix) {
|
|
algo = strings.TrimPrefix(s, rsaPrefix+"-")
|
|
} else if strings.HasPrefix(s, ed25519Prefix) {
|
|
isEd25519 = true
|
|
algo = "sha512"
|
|
} else {
|
|
return nil, fmt.Errorf("no signer matching %q", s)
|
|
}
|
|
hash, cHash, err := newAlgorithm(algo, nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if isEd25519 {
|
|
return &ed25519Algorithm{}, nil
|
|
}
|
|
if isEcdsa {
|
|
return &ecdsaAlgorithm{
|
|
Hash: hash,
|
|
kind: cHash,
|
|
}, nil
|
|
}
|
|
return &rsaAlgorithm{
|
|
Hash: hash,
|
|
kind: cHash,
|
|
}, nil
|
|
}
|
|
|
|
// macerFromString is an internally public method constructor
|
|
func macerFromString(s string) (macer, error) {
|
|
s = strings.ToLower(s)
|
|
if strings.HasPrefix(s, hmacPrefix) {
|
|
algo := strings.TrimPrefix(s, hmacPrefix+"-")
|
|
hashFn, cHash, err := newAlgorithmConstructor(algo)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// Ensure below does not panic
|
|
_, err = hashFn(nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &hmacAlgorithm{
|
|
fn: func(key []byte) (hash.Hash, error) {
|
|
return hmac.New(func() hash.Hash {
|
|
h, e := hashFn(nil)
|
|
if e != nil {
|
|
panic(e)
|
|
}
|
|
return h
|
|
}, key), nil
|
|
},
|
|
kind: cHash,
|
|
}, nil
|
|
} else if bl, ok := stringToHash[s]; ok && blake2Algorithms[bl] {
|
|
hashFn, cHash, err := newAlgorithmConstructor(s)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &blakeMacAlgorithm{
|
|
fn: hashFn,
|
|
kind: cHash,
|
|
}, nil
|
|
} else {
|
|
return nil, fmt.Errorf("no MACer matching %q", s)
|
|
}
|
|
}
|