From 8c12c6939aab9106db14ec2d11d983bc5b29fb2c Mon Sep 17 00:00:00 2001 From: Niall Sheridan Date: Sun, 7 Jul 2019 21:33:44 +0100 Subject: Switch to modules --- vendor/golang.org/x/crypto/ssh/keys.go | 1035 -------------------------------- 1 file changed, 1035 deletions(-) delete mode 100644 vendor/golang.org/x/crypto/ssh/keys.go (limited to 'vendor/golang.org/x/crypto/ssh/keys.go') diff --git a/vendor/golang.org/x/crypto/ssh/keys.go b/vendor/golang.org/x/crypto/ssh/keys.go deleted file mode 100644 index 34d9582..0000000 --- a/vendor/golang.org/x/crypto/ssh/keys.go +++ /dev/null @@ -1,1035 +0,0 @@ -// Copyright 2012 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package ssh - -import ( - "bytes" - "crypto" - "crypto/dsa" - "crypto/ecdsa" - "crypto/elliptic" - "crypto/md5" - "crypto/rsa" - "crypto/sha256" - "crypto/x509" - "encoding/asn1" - "encoding/base64" - "encoding/hex" - "encoding/pem" - "errors" - "fmt" - "io" - "math/big" - "strings" - - "golang.org/x/crypto/ed25519" -) - -// These constants represent the algorithm names for key types supported by this -// package. -const ( - KeyAlgoRSA = "ssh-rsa" - KeyAlgoDSA = "ssh-dss" - KeyAlgoECDSA256 = "ecdsa-sha2-nistp256" - KeyAlgoECDSA384 = "ecdsa-sha2-nistp384" - KeyAlgoECDSA521 = "ecdsa-sha2-nistp521" - KeyAlgoED25519 = "ssh-ed25519" -) - -// parsePubKey parses a public key of the given algorithm. -// Use ParsePublicKey for keys with prepended algorithm. -func parsePubKey(in []byte, algo string) (pubKey PublicKey, rest []byte, err error) { - switch algo { - case KeyAlgoRSA: - return parseRSA(in) - case KeyAlgoDSA: - return parseDSA(in) - case KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521: - return parseECDSA(in) - case KeyAlgoED25519: - return parseED25519(in) - case CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoED25519v01: - cert, err := parseCert(in, certToPrivAlgo(algo)) - if err != nil { - return nil, nil, err - } - return cert, nil, nil - } - return nil, nil, fmt.Errorf("ssh: unknown key algorithm: %v", algo) -} - -// parseAuthorizedKey parses a public key in OpenSSH authorized_keys format -// (see sshd(8) manual page) once the options and key type fields have been -// removed. -func parseAuthorizedKey(in []byte) (out PublicKey, comment string, err error) { - in = bytes.TrimSpace(in) - - i := bytes.IndexAny(in, " \t") - if i == -1 { - i = len(in) - } - base64Key := in[:i] - - key := make([]byte, base64.StdEncoding.DecodedLen(len(base64Key))) - n, err := base64.StdEncoding.Decode(key, base64Key) - if err != nil { - return nil, "", err - } - key = key[:n] - out, err = ParsePublicKey(key) - if err != nil { - return nil, "", err - } - comment = string(bytes.TrimSpace(in[i:])) - return out, comment, nil -} - -// ParseKnownHosts parses an entry in the format of the known_hosts file. -// -// The known_hosts format is documented in the sshd(8) manual page. This -// function will parse a single entry from in. On successful return, marker -// will contain the optional marker value (i.e. "cert-authority" or "revoked") -// or else be empty, hosts will contain the hosts that this entry matches, -// pubKey will contain the public key and comment will contain any trailing -// comment at the end of the line. See the sshd(8) manual page for the various -// forms that a host string can take. -// -// The unparsed remainder of the input will be returned in rest. This function -// can be called repeatedly to parse multiple entries. -// -// If no entries were found in the input then err will be io.EOF. Otherwise a -// non-nil err value indicates a parse error. -func ParseKnownHosts(in []byte) (marker string, hosts []string, pubKey PublicKey, comment string, rest []byte, err error) { - for len(in) > 0 { - end := bytes.IndexByte(in, '\n') - if end != -1 { - rest = in[end+1:] - in = in[:end] - } else { - rest = nil - } - - end = bytes.IndexByte(in, '\r') - if end != -1 { - in = in[:end] - } - - in = bytes.TrimSpace(in) - if len(in) == 0 || in[0] == '#' { - in = rest - continue - } - - i := bytes.IndexAny(in, " \t") - if i == -1 { - in = rest - continue - } - - // Strip out the beginning of the known_host key. - // This is either an optional marker or a (set of) hostname(s). - keyFields := bytes.Fields(in) - if len(keyFields) < 3 || len(keyFields) > 5 { - return "", nil, nil, "", nil, errors.New("ssh: invalid entry in known_hosts data") - } - - // keyFields[0] is either "@cert-authority", "@revoked" or a comma separated - // list of hosts - marker := "" - if keyFields[0][0] == '@' { - marker = string(keyFields[0][1:]) - keyFields = keyFields[1:] - } - - hosts := string(keyFields[0]) - // keyFields[1] contains the key type (e.g. “ssh-rsa”). - // However, that information is duplicated inside the - // base64-encoded key and so is ignored here. - - key := bytes.Join(keyFields[2:], []byte(" ")) - if pubKey, comment, err = parseAuthorizedKey(key); err != nil { - return "", nil, nil, "", nil, err - } - - return marker, strings.Split(hosts, ","), pubKey, comment, rest, nil - } - - return "", nil, nil, "", nil, io.EOF -} - -// ParseAuthorizedKeys parses a public key from an authorized_keys -// file used in OpenSSH according to the sshd(8) manual page. -func ParseAuthorizedKey(in []byte) (out PublicKey, comment string, options []string, rest []byte, err error) { - for len(in) > 0 { - end := bytes.IndexByte(in, '\n') - if end != -1 { - rest = in[end+1:] - in = in[:end] - } else { - rest = nil - } - - end = bytes.IndexByte(in, '\r') - if end != -1 { - in = in[:end] - } - - in = bytes.TrimSpace(in) - if len(in) == 0 || in[0] == '#' { - in = rest - continue - } - - i := bytes.IndexAny(in, " \t") - if i == -1 { - in = rest - continue - } - - if out, comment, err = parseAuthorizedKey(in[i:]); err == nil { - return out, comment, options, rest, nil - } - - // No key type recognised. Maybe there's an options field at - // the beginning. - var b byte - inQuote := false - var candidateOptions []string - optionStart := 0 - for i, b = range in { - isEnd := !inQuote && (b == ' ' || b == '\t') - if (b == ',' && !inQuote) || isEnd { - if i-optionStart > 0 { - candidateOptions = append(candidateOptions, string(in[optionStart:i])) - } - optionStart = i + 1 - } - if isEnd { - break - } - if b == '"' && (i == 0 || (i > 0 && in[i-1] != '\\')) { - inQuote = !inQuote - } - } - for i < len(in) && (in[i] == ' ' || in[i] == '\t') { - i++ - } - if i == len(in) { - // Invalid line: unmatched quote - in = rest - continue - } - - in = in[i:] - i = bytes.IndexAny(in, " \t") - if i == -1 { - in = rest - continue - } - - if out, comment, err = parseAuthorizedKey(in[i:]); err == nil { - options = candidateOptions - return out, comment, options, rest, nil - } - - in = rest - continue - } - - return nil, "", nil, nil, errors.New("ssh: no key found") -} - -// ParsePublicKey parses an SSH public key formatted for use in -// the SSH wire protocol according to RFC 4253, section 6.6. -func ParsePublicKey(in []byte) (out PublicKey, err error) { - algo, in, ok := parseString(in) - if !ok { - return nil, errShortRead - } - var rest []byte - out, rest, err = parsePubKey(in, string(algo)) - if len(rest) > 0 { - return nil, errors.New("ssh: trailing junk in public key") - } - - return out, err -} - -// MarshalAuthorizedKey serializes key for inclusion in an OpenSSH -// authorized_keys file. The return value ends with newline. -func MarshalAuthorizedKey(key PublicKey) []byte { - b := &bytes.Buffer{} - b.WriteString(key.Type()) - b.WriteByte(' ') - e := base64.NewEncoder(base64.StdEncoding, b) - e.Write(key.Marshal()) - e.Close() - b.WriteByte('\n') - return b.Bytes() -} - -// PublicKey is an abstraction of different types of public keys. -type PublicKey interface { - // Type returns the key's type, e.g. "ssh-rsa". - Type() string - - // Marshal returns the serialized key data in SSH wire format, - // with the name prefix. To unmarshal the returned data, use - // the ParsePublicKey function. - Marshal() []byte - - // Verify that sig is a signature on the given data using this - // key. This function will hash the data appropriately first. - Verify(data []byte, sig *Signature) error -} - -// CryptoPublicKey, if implemented by a PublicKey, -// returns the underlying crypto.PublicKey form of the key. -type CryptoPublicKey interface { - CryptoPublicKey() crypto.PublicKey -} - -// A Signer can create signatures that verify against a public key. -type Signer interface { - // PublicKey returns an associated PublicKey instance. - PublicKey() PublicKey - - // Sign returns raw signature for the given data. This method - // will apply the hash specified for the keytype to the data. - Sign(rand io.Reader, data []byte) (*Signature, error) -} - -type rsaPublicKey rsa.PublicKey - -func (r *rsaPublicKey) Type() string { - return "ssh-rsa" -} - -// parseRSA parses an RSA key according to RFC 4253, section 6.6. -func parseRSA(in []byte) (out PublicKey, rest []byte, err error) { - var w struct { - E *big.Int - N *big.Int - Rest []byte `ssh:"rest"` - } - if err := Unmarshal(in, &w); err != nil { - return nil, nil, err - } - - if w.E.BitLen() > 24 { - return nil, nil, errors.New("ssh: exponent too large") - } - e := w.E.Int64() - if e < 3 || e&1 == 0 { - return nil, nil, errors.New("ssh: incorrect exponent") - } - - var key rsa.PublicKey - key.E = int(e) - key.N = w.N - return (*rsaPublicKey)(&key), w.Rest, nil -} - -func (r *rsaPublicKey) Marshal() []byte { - e := new(big.Int).SetInt64(int64(r.E)) - // RSA publickey struct layout should match the struct used by - // parseRSACert in the x/crypto/ssh/agent package. - wirekey := struct { - Name string - E *big.Int - N *big.Int - }{ - KeyAlgoRSA, - e, - r.N, - } - return Marshal(&wirekey) -} - -func (r *rsaPublicKey) Verify(data []byte, sig *Signature) error { - if sig.Format != r.Type() { - return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, r.Type()) - } - h := crypto.SHA1.New() - h.Write(data) - digest := h.Sum(nil) - return rsa.VerifyPKCS1v15((*rsa.PublicKey)(r), crypto.SHA1, digest, sig.Blob) -} - -func (r *rsaPublicKey) CryptoPublicKey() crypto.PublicKey { - return (*rsa.PublicKey)(r) -} - -type dsaPublicKey dsa.PublicKey - -func (k *dsaPublicKey) Type() string { - return "ssh-dss" -} - -func checkDSAParams(param *dsa.Parameters) error { - // SSH specifies FIPS 186-2, which only provided a single size - // (1024 bits) DSA key. FIPS 186-3 allows for larger key - // sizes, which would confuse SSH. - if l := param.P.BitLen(); l != 1024 { - return fmt.Errorf("ssh: unsupported DSA key size %d", l) - } - - return nil -} - -// parseDSA parses an DSA key according to RFC 4253, section 6.6. -func parseDSA(in []byte) (out PublicKey, rest []byte, err error) { - var w struct { - P, Q, G, Y *big.Int - Rest []byte `ssh:"rest"` - } - if err := Unmarshal(in, &w); err != nil { - return nil, nil, err - } - - param := dsa.Parameters{ - P: w.P, - Q: w.Q, - G: w.G, - } - if err := checkDSAParams(¶m); err != nil { - return nil, nil, err - } - - key := &dsaPublicKey{ - Parameters: param, - Y: w.Y, - } - return key, w.Rest, nil -} - -func (k *dsaPublicKey) Marshal() []byte { - // DSA publickey struct layout should match the struct used by - // parseDSACert in the x/crypto/ssh/agent package. - w := struct { - Name string - P, Q, G, Y *big.Int - }{ - k.Type(), - k.P, - k.Q, - k.G, - k.Y, - } - - return Marshal(&w) -} - -func (k *dsaPublicKey) Verify(data []byte, sig *Signature) error { - if sig.Format != k.Type() { - return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, k.Type()) - } - h := crypto.SHA1.New() - h.Write(data) - digest := h.Sum(nil) - - // Per RFC 4253, section 6.6, - // The value for 'dss_signature_blob' is encoded as a string containing - // r, followed by s (which are 160-bit integers, without lengths or - // padding, unsigned, and in network byte order). - // For DSS purposes, sig.Blob should be exactly 40 bytes in length. - if len(sig.Blob) != 40 { - return errors.New("ssh: DSA signature parse error") - } - r := new(big.Int).SetBytes(sig.Blob[:20]) - s := new(big.Int).SetBytes(sig.Blob[20:]) - if dsa.Verify((*dsa.PublicKey)(k), digest, r, s) { - return nil - } - return errors.New("ssh: signature did not verify") -} - -func (k *dsaPublicKey) CryptoPublicKey() crypto.PublicKey { - return (*dsa.PublicKey)(k) -} - -type dsaPrivateKey struct { - *dsa.PrivateKey -} - -func (k *dsaPrivateKey) PublicKey() PublicKey { - return (*dsaPublicKey)(&k.PrivateKey.PublicKey) -} - -func (k *dsaPrivateKey) Sign(rand io.Reader, data []byte) (*Signature, error) { - h := crypto.SHA1.New() - h.Write(data) - digest := h.Sum(nil) - r, s, err := dsa.Sign(rand, k.PrivateKey, digest) - if err != nil { - return nil, err - } - - sig := make([]byte, 40) - rb := r.Bytes() - sb := s.Bytes() - - copy(sig[20-len(rb):20], rb) - copy(sig[40-len(sb):], sb) - - return &Signature{ - Format: k.PublicKey().Type(), - Blob: sig, - }, nil -} - -type ecdsaPublicKey ecdsa.PublicKey - -func (k *ecdsaPublicKey) Type() string { - return "ecdsa-sha2-" + k.nistID() -} - -func (k *ecdsaPublicKey) nistID() string { - switch k.Params().BitSize { - case 256: - return "nistp256" - case 384: - return "nistp384" - case 521: - return "nistp521" - } - panic("ssh: unsupported ecdsa key size") -} - -type ed25519PublicKey ed25519.PublicKey - -func (k ed25519PublicKey) Type() string { - return KeyAlgoED25519 -} - -func parseED25519(in []byte) (out PublicKey, rest []byte, err error) { - var w struct { - KeyBytes []byte - Rest []byte `ssh:"rest"` - } - - if err := Unmarshal(in, &w); err != nil { - return nil, nil, err - } - - key := ed25519.PublicKey(w.KeyBytes) - - return (ed25519PublicKey)(key), w.Rest, nil -} - -func (k ed25519PublicKey) Marshal() []byte { - w := struct { - Name string - KeyBytes []byte - }{ - KeyAlgoED25519, - []byte(k), - } - return Marshal(&w) -} - -func (k ed25519PublicKey) Verify(b []byte, sig *Signature) error { - if sig.Format != k.Type() { - return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, k.Type()) - } - - edKey := (ed25519.PublicKey)(k) - if ok := ed25519.Verify(edKey, b, sig.Blob); !ok { - return errors.New("ssh: signature did not verify") - } - - return nil -} - -func (k ed25519PublicKey) CryptoPublicKey() crypto.PublicKey { - return ed25519.PublicKey(k) -} - -func supportedEllipticCurve(curve elliptic.Curve) bool { - return curve == elliptic.P256() || curve == elliptic.P384() || curve == elliptic.P521() -} - -// ecHash returns the hash to match the given elliptic curve, see RFC -// 5656, section 6.2.1 -func ecHash(curve elliptic.Curve) crypto.Hash { - bitSize := curve.Params().BitSize - switch { - case bitSize <= 256: - return crypto.SHA256 - case bitSize <= 384: - return crypto.SHA384 - } - return crypto.SHA512 -} - -// parseECDSA parses an ECDSA key according to RFC 5656, section 3.1. -func parseECDSA(in []byte) (out PublicKey, rest []byte, err error) { - var w struct { - Curve string - KeyBytes []byte - Rest []byte `ssh:"rest"` - } - - if err := Unmarshal(in, &w); err != nil { - return nil, nil, err - } - - key := new(ecdsa.PublicKey) - - switch w.Curve { - case "nistp256": - key.Curve = elliptic.P256() - case "nistp384": - key.Curve = elliptic.P384() - case "nistp521": - key.Curve = elliptic.P521() - default: - return nil, nil, errors.New("ssh: unsupported curve") - } - - key.X, key.Y = elliptic.Unmarshal(key.Curve, w.KeyBytes) - if key.X == nil || key.Y == nil { - return nil, nil, errors.New("ssh: invalid curve point") - } - return (*ecdsaPublicKey)(key), w.Rest, nil -} - -func (k *ecdsaPublicKey) Marshal() []byte { - // See RFC 5656, section 3.1. - keyBytes := elliptic.Marshal(k.Curve, k.X, k.Y) - // ECDSA publickey struct layout should match the struct used by - // parseECDSACert in the x/crypto/ssh/agent package. - w := struct { - Name string - ID string - Key []byte - }{ - k.Type(), - k.nistID(), - keyBytes, - } - - return Marshal(&w) -} - -func (k *ecdsaPublicKey) Verify(data []byte, sig *Signature) error { - if sig.Format != k.Type() { - return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, k.Type()) - } - - h := ecHash(k.Curve).New() - h.Write(data) - digest := h.Sum(nil) - - // Per RFC 5656, section 3.1.2, - // The ecdsa_signature_blob value has the following specific encoding: - // mpint r - // mpint s - var ecSig struct { - R *big.Int - S *big.Int - } - - if err := Unmarshal(sig.Blob, &ecSig); err != nil { - return err - } - - if ecdsa.Verify((*ecdsa.PublicKey)(k), digest, ecSig.R, ecSig.S) { - return nil - } - return errors.New("ssh: signature did not verify") -} - -func (k *ecdsaPublicKey) CryptoPublicKey() crypto.PublicKey { - return (*ecdsa.PublicKey)(k) -} - -// NewSignerFromKey takes an *rsa.PrivateKey, *dsa.PrivateKey, -// *ecdsa.PrivateKey or any other crypto.Signer and returns a -// corresponding Signer instance. ECDSA keys must use P-256, P-384 or -// P-521. DSA keys must use parameter size L1024N160. -func NewSignerFromKey(key interface{}) (Signer, error) { - switch key := key.(type) { - case crypto.Signer: - return NewSignerFromSigner(key) - case *dsa.PrivateKey: - return newDSAPrivateKey(key) - default: - return nil, fmt.Errorf("ssh: unsupported key type %T", key) - } -} - -func newDSAPrivateKey(key *dsa.PrivateKey) (Signer, error) { - if err := checkDSAParams(&key.PublicKey.Parameters); err != nil { - return nil, err - } - - return &dsaPrivateKey{key}, nil -} - -type wrappedSigner struct { - signer crypto.Signer - pubKey PublicKey -} - -// NewSignerFromSigner takes any crypto.Signer implementation and -// returns a corresponding Signer interface. This can be used, for -// example, with keys kept in hardware modules. -func NewSignerFromSigner(signer crypto.Signer) (Signer, error) { - pubKey, err := NewPublicKey(signer.Public()) - if err != nil { - return nil, err - } - - return &wrappedSigner{signer, pubKey}, nil -} - -func (s *wrappedSigner) PublicKey() PublicKey { - return s.pubKey -} - -func (s *wrappedSigner) Sign(rand io.Reader, data []byte) (*Signature, error) { - var hashFunc crypto.Hash - - switch key := s.pubKey.(type) { - case *rsaPublicKey, *dsaPublicKey: - hashFunc = crypto.SHA1 - case *ecdsaPublicKey: - hashFunc = ecHash(key.Curve) - case ed25519PublicKey: - default: - return nil, fmt.Errorf("ssh: unsupported key type %T", key) - } - - var digest []byte - if hashFunc != 0 { - h := hashFunc.New() - h.Write(data) - digest = h.Sum(nil) - } else { - digest = data - } - - signature, err := s.signer.Sign(rand, digest, hashFunc) - if err != nil { - return nil, err - } - - // crypto.Signer.Sign is expected to return an ASN.1-encoded signature - // for ECDSA and DSA, but that's not the encoding expected by SSH, so - // re-encode. - switch s.pubKey.(type) { - case *ecdsaPublicKey, *dsaPublicKey: - type asn1Signature struct { - R, S *big.Int - } - asn1Sig := new(asn1Signature) - _, err := asn1.Unmarshal(signature, asn1Sig) - if err != nil { - return nil, err - } - - switch s.pubKey.(type) { - case *ecdsaPublicKey: - signature = Marshal(asn1Sig) - - case *dsaPublicKey: - signature = make([]byte, 40) - r := asn1Sig.R.Bytes() - s := asn1Sig.S.Bytes() - copy(signature[20-len(r):20], r) - copy(signature[40-len(s):40], s) - } - } - - return &Signature{ - Format: s.pubKey.Type(), - Blob: signature, - }, nil -} - -// NewPublicKey takes an *rsa.PublicKey, *dsa.PublicKey, *ecdsa.PublicKey, -// or ed25519.PublicKey returns a corresponding PublicKey instance. -// ECDSA keys must use P-256, P-384 or P-521. -func NewPublicKey(key interface{}) (PublicKey, error) { - switch key := key.(type) { - case *rsa.PublicKey: - return (*rsaPublicKey)(key), nil - case *ecdsa.PublicKey: - if !supportedEllipticCurve(key.Curve) { - return nil, errors.New("ssh: only P-256, P-384 and P-521 EC keys are supported") - } - return (*ecdsaPublicKey)(key), nil - case *dsa.PublicKey: - return (*dsaPublicKey)(key), nil - case ed25519.PublicKey: - return (ed25519PublicKey)(key), nil - default: - return nil, fmt.Errorf("ssh: unsupported key type %T", key) - } -} - -// ParsePrivateKey returns a Signer from a PEM encoded private key. It supports -// the same keys as ParseRawPrivateKey. -func ParsePrivateKey(pemBytes []byte) (Signer, error) { - key, err := ParseRawPrivateKey(pemBytes) - if err != nil { - return nil, err - } - - return NewSignerFromKey(key) -} - -// ParsePrivateKeyWithPassphrase returns a Signer from a PEM encoded private -// key and passphrase. It supports the same keys as -// ParseRawPrivateKeyWithPassphrase. -func ParsePrivateKeyWithPassphrase(pemBytes, passPhrase []byte) (Signer, error) { - key, err := ParseRawPrivateKeyWithPassphrase(pemBytes, passPhrase) - if err != nil { - return nil, err - } - - return NewSignerFromKey(key) -} - -// encryptedBlock tells whether a private key is -// encrypted by examining its Proc-Type header -// for a mention of ENCRYPTED -// according to RFC 1421 Section 4.6.1.1. -func encryptedBlock(block *pem.Block) bool { - return strings.Contains(block.Headers["Proc-Type"], "ENCRYPTED") -} - -// ParseRawPrivateKey returns a private key from a PEM encoded private key. It -// supports RSA (PKCS#1), PKCS#8, DSA (OpenSSL), and ECDSA private keys. -func ParseRawPrivateKey(pemBytes []byte) (interface{}, error) { - block, _ := pem.Decode(pemBytes) - if block == nil { - return nil, errors.New("ssh: no key found") - } - - if encryptedBlock(block) { - return nil, errors.New("ssh: cannot decode encrypted private keys") - } - - switch block.Type { - case "RSA PRIVATE KEY": - return x509.ParsePKCS1PrivateKey(block.Bytes) - // RFC5208 - https://tools.ietf.org/html/rfc5208 - case "PRIVATE KEY": - return x509.ParsePKCS8PrivateKey(block.Bytes) - case "EC PRIVATE KEY": - return x509.ParseECPrivateKey(block.Bytes) - case "DSA PRIVATE KEY": - return ParseDSAPrivateKey(block.Bytes) - case "OPENSSH PRIVATE KEY": - return parseOpenSSHPrivateKey(block.Bytes) - default: - return nil, fmt.Errorf("ssh: unsupported key type %q", block.Type) - } -} - -// ParseRawPrivateKeyWithPassphrase returns a private key decrypted with -// passphrase from a PEM encoded private key. If wrong passphrase, return -// x509.IncorrectPasswordError. -func ParseRawPrivateKeyWithPassphrase(pemBytes, passPhrase []byte) (interface{}, error) { - block, _ := pem.Decode(pemBytes) - if block == nil { - return nil, errors.New("ssh: no key found") - } - buf := block.Bytes - - if encryptedBlock(block) { - if x509.IsEncryptedPEMBlock(block) { - var err error - buf, err = x509.DecryptPEMBlock(block, passPhrase) - if err != nil { - if err == x509.IncorrectPasswordError { - return nil, err - } - return nil, fmt.Errorf("ssh: cannot decode encrypted private keys: %v", err) - } - } - } - - switch block.Type { - case "RSA PRIVATE KEY": - return x509.ParsePKCS1PrivateKey(buf) - case "EC PRIVATE KEY": - return x509.ParseECPrivateKey(buf) - case "DSA PRIVATE KEY": - return ParseDSAPrivateKey(buf) - case "OPENSSH PRIVATE KEY": - return parseOpenSSHPrivateKey(buf) - default: - return nil, fmt.Errorf("ssh: unsupported key type %q", block.Type) - } -} - -// ParseDSAPrivateKey returns a DSA private key from its ASN.1 DER encoding, as -// specified by the OpenSSL DSA man page. -func ParseDSAPrivateKey(der []byte) (*dsa.PrivateKey, error) { - var k struct { - Version int - P *big.Int - Q *big.Int - G *big.Int - Pub *big.Int - Priv *big.Int - } - rest, err := asn1.Unmarshal(der, &k) - if err != nil { - return nil, errors.New("ssh: failed to parse DSA key: " + err.Error()) - } - if len(rest) > 0 { - return nil, errors.New("ssh: garbage after DSA key") - } - - return &dsa.PrivateKey{ - PublicKey: dsa.PublicKey{ - Parameters: dsa.Parameters{ - P: k.P, - Q: k.Q, - G: k.G, - }, - Y: k.Pub, - }, - X: k.Priv, - }, nil -} - -// Implemented based on the documentation at -// https://github.com/openssh/openssh-portable/blob/master/PROTOCOL.key -func parseOpenSSHPrivateKey(key []byte) (crypto.PrivateKey, error) { - magic := append([]byte("openssh-key-v1"), 0) - if !bytes.Equal(magic, key[0:len(magic)]) { - return nil, errors.New("ssh: invalid openssh private key format") - } - remaining := key[len(magic):] - - var w struct { - CipherName string - KdfName string - KdfOpts string - NumKeys uint32 - PubKey []byte - PrivKeyBlock []byte - } - - if err := Unmarshal(remaining, &w); err != nil { - return nil, err - } - - if w.KdfName != "none" || w.CipherName != "none" { - return nil, errors.New("ssh: cannot decode encrypted private keys") - } - - pk1 := struct { - Check1 uint32 - Check2 uint32 - Keytype string - Rest []byte `ssh:"rest"` - }{} - - if err := Unmarshal(w.PrivKeyBlock, &pk1); err != nil { - return nil, err - } - - if pk1.Check1 != pk1.Check2 { - return nil, errors.New("ssh: checkint mismatch") - } - - // we only handle ed25519 and rsa keys currently - switch pk1.Keytype { - case KeyAlgoRSA: - // https://github.com/openssh/openssh-portable/blob/master/sshkey.c#L2760-L2773 - key := struct { - N *big.Int - E *big.Int - D *big.Int - Iqmp *big.Int - P *big.Int - Q *big.Int - Comment string - Pad []byte `ssh:"rest"` - }{} - - if err := Unmarshal(pk1.Rest, &key); err != nil { - return nil, err - } - - for i, b := range key.Pad { - if int(b) != i+1 { - return nil, errors.New("ssh: padding not as expected") - } - } - - pk := &rsa.PrivateKey{ - PublicKey: rsa.PublicKey{ - N: key.N, - E: int(key.E.Int64()), - }, - D: key.D, - Primes: []*big.Int{key.P, key.Q}, - } - - if err := pk.Validate(); err != nil { - return nil, err - } - - pk.Precompute() - - return pk, nil - case KeyAlgoED25519: - key := struct { - Pub []byte - Priv []byte - Comment string - Pad []byte `ssh:"rest"` - }{} - - if err := Unmarshal(pk1.Rest, &key); err != nil { - return nil, err - } - - if len(key.Priv) != ed25519.PrivateKeySize { - return nil, errors.New("ssh: private key unexpected length") - } - - for i, b := range key.Pad { - if int(b) != i+1 { - return nil, errors.New("ssh: padding not as expected") - } - } - - pk := ed25519.PrivateKey(make([]byte, ed25519.PrivateKeySize)) - copy(pk, key.Priv) - return &pk, nil - default: - return nil, errors.New("ssh: unhandled key type") - } -} - -// FingerprintLegacyMD5 returns the user presentation of the key's -// fingerprint as described by RFC 4716 section 4. -func FingerprintLegacyMD5(pubKey PublicKey) string { - md5sum := md5.Sum(pubKey.Marshal()) - hexarray := make([]string, len(md5sum)) - for i, c := range md5sum { - hexarray[i] = hex.EncodeToString([]byte{c}) - } - return strings.Join(hexarray, ":") -} - -// FingerprintSHA256 returns the user presentation of the key's -// fingerprint as unpadded base64 encoded sha256 hash. -// This format was introduced from OpenSSH 6.8. -// https://www.openssh.com/txt/release-6.8 -// https://tools.ietf.org/html/rfc4648#section-3.2 (unpadded base64 encoding) -func FingerprintSHA256(pubKey PublicKey) string { - sha256sum := sha256.Sum256(pubKey.Marshal()) - hash := base64.RawStdEncoding.EncodeToString(sha256sum[:]) - return "SHA256:" + hash -} -- cgit v1.2.3