mirror of
https://github.com/go-gitea/gitea
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694 lines
19 KiB
Go
694 lines
19 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package openpgp
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import (
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"crypto/rsa"
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"io"
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"time"
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"golang.org/x/crypto/openpgp/armor"
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"golang.org/x/crypto/openpgp/errors"
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"golang.org/x/crypto/openpgp/packet"
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)
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// PublicKeyType is the armor type for a PGP public key.
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var PublicKeyType = "PGP PUBLIC KEY BLOCK"
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// PrivateKeyType is the armor type for a PGP private key.
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var PrivateKeyType = "PGP PRIVATE KEY BLOCK"
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// An Entity represents the components of an OpenPGP key: a primary public key
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// (which must be a signing key), one or more identities claimed by that key,
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// and zero or more subkeys, which may be encryption keys.
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type Entity struct {
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PrimaryKey *packet.PublicKey
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PrivateKey *packet.PrivateKey
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Identities map[string]*Identity // indexed by Identity.Name
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Revocations []*packet.Signature
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Subkeys []Subkey
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}
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// An Identity represents an identity claimed by an Entity and zero or more
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// assertions by other entities about that claim.
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type Identity struct {
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Name string // by convention, has the form "Full Name (comment) <email@example.com>"
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UserId *packet.UserId
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SelfSignature *packet.Signature
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Signatures []*packet.Signature
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}
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// A Subkey is an additional public key in an Entity. Subkeys can be used for
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// encryption.
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type Subkey struct {
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PublicKey *packet.PublicKey
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PrivateKey *packet.PrivateKey
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Sig *packet.Signature
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}
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// A Key identifies a specific public key in an Entity. This is either the
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// Entity's primary key or a subkey.
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type Key struct {
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Entity *Entity
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PublicKey *packet.PublicKey
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PrivateKey *packet.PrivateKey
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SelfSignature *packet.Signature
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}
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// A KeyRing provides access to public and private keys.
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type KeyRing interface {
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// KeysById returns the set of keys that have the given key id.
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KeysById(id uint64) []Key
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// KeysByIdAndUsage returns the set of keys with the given id
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// that also meet the key usage given by requiredUsage.
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// The requiredUsage is expressed as the bitwise-OR of
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// packet.KeyFlag* values.
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KeysByIdUsage(id uint64, requiredUsage byte) []Key
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// DecryptionKeys returns all private keys that are valid for
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// decryption.
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DecryptionKeys() []Key
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}
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// primaryIdentity returns the Identity marked as primary or the first identity
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// if none are so marked.
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func (e *Entity) primaryIdentity() *Identity {
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var firstIdentity *Identity
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for _, ident := range e.Identities {
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if firstIdentity == nil {
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firstIdentity = ident
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}
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if ident.SelfSignature.IsPrimaryId != nil && *ident.SelfSignature.IsPrimaryId {
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return ident
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}
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}
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return firstIdentity
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}
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// encryptionKey returns the best candidate Key for encrypting a message to the
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// given Entity.
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func (e *Entity) encryptionKey(now time.Time) (Key, bool) {
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candidateSubkey := -1
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// Iterate the keys to find the newest key
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var maxTime time.Time
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for i, subkey := range e.Subkeys {
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if subkey.Sig.FlagsValid &&
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subkey.Sig.FlagEncryptCommunications &&
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subkey.PublicKey.PubKeyAlgo.CanEncrypt() &&
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!subkey.Sig.KeyExpired(now) &&
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(maxTime.IsZero() || subkey.Sig.CreationTime.After(maxTime)) {
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candidateSubkey = i
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maxTime = subkey.Sig.CreationTime
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}
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}
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if candidateSubkey != -1 {
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subkey := e.Subkeys[candidateSubkey]
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return Key{e, subkey.PublicKey, subkey.PrivateKey, subkey.Sig}, true
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}
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// If we don't have any candidate subkeys for encryption and
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// the primary key doesn't have any usage metadata then we
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// assume that the primary key is ok. Or, if the primary key is
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// marked as ok to encrypt to, then we can obviously use it.
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i := e.primaryIdentity()
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if !i.SelfSignature.FlagsValid || i.SelfSignature.FlagEncryptCommunications &&
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e.PrimaryKey.PubKeyAlgo.CanEncrypt() &&
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!i.SelfSignature.KeyExpired(now) {
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return Key{e, e.PrimaryKey, e.PrivateKey, i.SelfSignature}, true
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}
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// This Entity appears to be signing only.
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return Key{}, false
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}
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// signingKey return the best candidate Key for signing a message with this
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// Entity.
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func (e *Entity) signingKey(now time.Time) (Key, bool) {
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candidateSubkey := -1
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for i, subkey := range e.Subkeys {
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if subkey.Sig.FlagsValid &&
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subkey.Sig.FlagSign &&
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subkey.PublicKey.PubKeyAlgo.CanSign() &&
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!subkey.Sig.KeyExpired(now) {
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candidateSubkey = i
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break
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}
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}
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if candidateSubkey != -1 {
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subkey := e.Subkeys[candidateSubkey]
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return Key{e, subkey.PublicKey, subkey.PrivateKey, subkey.Sig}, true
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}
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// If we have no candidate subkey then we assume that it's ok to sign
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// with the primary key.
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i := e.primaryIdentity()
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if !i.SelfSignature.FlagsValid || i.SelfSignature.FlagSign &&
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!i.SelfSignature.KeyExpired(now) {
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return Key{e, e.PrimaryKey, e.PrivateKey, i.SelfSignature}, true
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}
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return Key{}, false
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}
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// An EntityList contains one or more Entities.
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type EntityList []*Entity
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// KeysById returns the set of keys that have the given key id.
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func (el EntityList) KeysById(id uint64) (keys []Key) {
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for _, e := range el {
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if e.PrimaryKey.KeyId == id {
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var selfSig *packet.Signature
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for _, ident := range e.Identities {
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if selfSig == nil {
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selfSig = ident.SelfSignature
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} else if ident.SelfSignature.IsPrimaryId != nil && *ident.SelfSignature.IsPrimaryId {
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selfSig = ident.SelfSignature
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break
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}
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}
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keys = append(keys, Key{e, e.PrimaryKey, e.PrivateKey, selfSig})
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}
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for _, subKey := range e.Subkeys {
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if subKey.PublicKey.KeyId == id {
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keys = append(keys, Key{e, subKey.PublicKey, subKey.PrivateKey, subKey.Sig})
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}
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}
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}
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return
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}
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// KeysByIdAndUsage returns the set of keys with the given id that also meet
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// the key usage given by requiredUsage. The requiredUsage is expressed as
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// the bitwise-OR of packet.KeyFlag* values.
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func (el EntityList) KeysByIdUsage(id uint64, requiredUsage byte) (keys []Key) {
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for _, key := range el.KeysById(id) {
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if len(key.Entity.Revocations) > 0 {
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continue
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}
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if key.SelfSignature.RevocationReason != nil {
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continue
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}
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if key.SelfSignature.FlagsValid && requiredUsage != 0 {
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var usage byte
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if key.SelfSignature.FlagCertify {
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usage |= packet.KeyFlagCertify
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}
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if key.SelfSignature.FlagSign {
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usage |= packet.KeyFlagSign
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}
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if key.SelfSignature.FlagEncryptCommunications {
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usage |= packet.KeyFlagEncryptCommunications
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}
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if key.SelfSignature.FlagEncryptStorage {
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usage |= packet.KeyFlagEncryptStorage
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}
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if usage&requiredUsage != requiredUsage {
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continue
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}
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}
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keys = append(keys, key)
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}
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return
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}
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// DecryptionKeys returns all private keys that are valid for decryption.
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func (el EntityList) DecryptionKeys() (keys []Key) {
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for _, e := range el {
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for _, subKey := range e.Subkeys {
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if subKey.PrivateKey != nil && (!subKey.Sig.FlagsValid || subKey.Sig.FlagEncryptStorage || subKey.Sig.FlagEncryptCommunications) {
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keys = append(keys, Key{e, subKey.PublicKey, subKey.PrivateKey, subKey.Sig})
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}
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}
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}
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return
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}
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// ReadArmoredKeyRing reads one or more public/private keys from an armor keyring file.
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func ReadArmoredKeyRing(r io.Reader) (EntityList, error) {
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block, err := armor.Decode(r)
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if err == io.EOF {
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return nil, errors.InvalidArgumentError("no armored data found")
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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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if block.Type != PublicKeyType && block.Type != PrivateKeyType {
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return nil, errors.InvalidArgumentError("expected public or private key block, got: " + block.Type)
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}
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return ReadKeyRing(block.Body)
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}
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// ReadKeyRing reads one or more public/private keys. Unsupported keys are
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// ignored as long as at least a single valid key is found.
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func ReadKeyRing(r io.Reader) (el EntityList, err error) {
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packets := packet.NewReader(r)
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var lastUnsupportedError error
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for {
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var e *Entity
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e, err = ReadEntity(packets)
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if err != nil {
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// TODO: warn about skipped unsupported/unreadable keys
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if _, ok := err.(errors.UnsupportedError); ok {
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lastUnsupportedError = err
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err = readToNextPublicKey(packets)
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} else if _, ok := err.(errors.StructuralError); ok {
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// Skip unreadable, badly-formatted keys
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lastUnsupportedError = err
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err = readToNextPublicKey(packets)
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}
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if err == io.EOF {
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err = nil
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break
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}
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if err != nil {
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el = nil
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break
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}
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} else {
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el = append(el, e)
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}
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}
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if len(el) == 0 && err == nil {
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err = lastUnsupportedError
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}
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return
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}
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// readToNextPublicKey reads packets until the start of the entity and leaves
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// the first packet of the new entity in the Reader.
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func readToNextPublicKey(packets *packet.Reader) (err error) {
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var p packet.Packet
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for {
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p, err = packets.Next()
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if err == io.EOF {
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return
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} else if err != nil {
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if _, ok := err.(errors.UnsupportedError); ok {
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err = nil
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continue
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}
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return
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}
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if pk, ok := p.(*packet.PublicKey); ok && !pk.IsSubkey {
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packets.Unread(p)
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return
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}
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}
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}
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// ReadEntity reads an entity (public key, identities, subkeys etc) from the
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// given Reader.
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func ReadEntity(packets *packet.Reader) (*Entity, error) {
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e := new(Entity)
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e.Identities = make(map[string]*Identity)
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p, err := packets.Next()
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if err != nil {
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return nil, err
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}
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var ok bool
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if e.PrimaryKey, ok = p.(*packet.PublicKey); !ok {
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if e.PrivateKey, ok = p.(*packet.PrivateKey); !ok {
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packets.Unread(p)
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return nil, errors.StructuralError("first packet was not a public/private key")
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}
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e.PrimaryKey = &e.PrivateKey.PublicKey
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}
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if !e.PrimaryKey.PubKeyAlgo.CanSign() {
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return nil, errors.StructuralError("primary key cannot be used for signatures")
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}
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var revocations []*packet.Signature
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EachPacket:
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for {
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p, err := packets.Next()
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if err == io.EOF {
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break
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} else if err != nil {
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return nil, err
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}
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switch pkt := p.(type) {
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case *packet.UserId:
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if err := addUserID(e, packets, pkt); err != nil {
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return nil, err
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}
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case *packet.Signature:
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if pkt.SigType == packet.SigTypeKeyRevocation {
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revocations = append(revocations, pkt)
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} else if pkt.SigType == packet.SigTypeDirectSignature {
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// TODO: RFC4880 5.2.1 permits signatures
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// directly on keys (eg. to bind additional
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// revocation keys).
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}
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// Else, ignoring the signature as it does not follow anything
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// we would know to attach it to.
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case *packet.PrivateKey:
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if pkt.IsSubkey == false {
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packets.Unread(p)
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break EachPacket
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}
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err = addSubkey(e, packets, &pkt.PublicKey, pkt)
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if err != nil {
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return nil, err
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}
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case *packet.PublicKey:
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if pkt.IsSubkey == false {
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packets.Unread(p)
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break EachPacket
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}
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err = addSubkey(e, packets, pkt, nil)
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if err != nil {
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return nil, err
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}
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default:
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// we ignore unknown packets
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}
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}
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if len(e.Identities) == 0 {
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return nil, errors.StructuralError("entity without any identities")
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}
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for _, revocation := range revocations {
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err = e.PrimaryKey.VerifyRevocationSignature(revocation)
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if err == nil {
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e.Revocations = append(e.Revocations, revocation)
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} else {
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// TODO: RFC 4880 5.2.3.15 defines revocation keys.
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return nil, errors.StructuralError("revocation signature signed by alternate key")
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}
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}
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return e, nil
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}
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func addUserID(e *Entity, packets *packet.Reader, pkt *packet.UserId) error {
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// Make a new Identity object, that we might wind up throwing away.
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// We'll only add it if we get a valid self-signature over this
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// userID.
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identity := new(Identity)
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identity.Name = pkt.Id
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identity.UserId = pkt
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for {
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p, err := packets.Next()
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if err == io.EOF {
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break
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} else if err != nil {
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return err
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}
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sig, ok := p.(*packet.Signature)
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if !ok {
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packets.Unread(p)
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break
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}
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if (sig.SigType == packet.SigTypePositiveCert || sig.SigType == packet.SigTypeGenericCert) && sig.IssuerKeyId != nil && *sig.IssuerKeyId == e.PrimaryKey.KeyId {
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if err = e.PrimaryKey.VerifyUserIdSignature(pkt.Id, e.PrimaryKey, sig); err != nil {
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return errors.StructuralError("user ID self-signature invalid: " + err.Error())
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}
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identity.SelfSignature = sig
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e.Identities[pkt.Id] = identity
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} else {
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identity.Signatures = append(identity.Signatures, sig)
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}
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}
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return nil
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}
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func addSubkey(e *Entity, packets *packet.Reader, pub *packet.PublicKey, priv *packet.PrivateKey) error {
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var subKey Subkey
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subKey.PublicKey = pub
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subKey.PrivateKey = priv
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for {
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p, err := packets.Next()
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if err == io.EOF {
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break
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} else if err != nil {
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return errors.StructuralError("subkey signature invalid: " + err.Error())
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}
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sig, ok := p.(*packet.Signature)
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if !ok {
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packets.Unread(p)
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break
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}
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if sig.SigType != packet.SigTypeSubkeyBinding && sig.SigType != packet.SigTypeSubkeyRevocation {
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return errors.StructuralError("subkey signature with wrong type")
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}
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if err := e.PrimaryKey.VerifyKeySignature(subKey.PublicKey, sig); err != nil {
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return errors.StructuralError("subkey signature invalid: " + err.Error())
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}
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switch sig.SigType {
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case packet.SigTypeSubkeyRevocation:
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subKey.Sig = sig
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case packet.SigTypeSubkeyBinding:
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if shouldReplaceSubkeySig(subKey.Sig, sig) {
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subKey.Sig = sig
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}
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}
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}
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if subKey.Sig == nil {
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return errors.StructuralError("subkey packet not followed by signature")
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}
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e.Subkeys = append(e.Subkeys, subKey)
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return nil
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}
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func shouldReplaceSubkeySig(existingSig, potentialNewSig *packet.Signature) bool {
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if potentialNewSig == nil {
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return false
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}
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if existingSig == nil {
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return true
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}
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if existingSig.SigType == packet.SigTypeSubkeyRevocation {
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return false // never override a revocation signature
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}
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return potentialNewSig.CreationTime.After(existingSig.CreationTime)
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}
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const defaultRSAKeyBits = 2048
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// NewEntity returns an Entity that contains a fresh RSA/RSA keypair with a
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// single identity composed of the given full name, comment and email, any of
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// which may be empty but must not contain any of "()<>\x00".
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// If config is nil, sensible defaults will be used.
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func NewEntity(name, comment, email string, config *packet.Config) (*Entity, error) {
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creationTime := config.Now()
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bits := defaultRSAKeyBits
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if config != nil && config.RSABits != 0 {
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bits = config.RSABits
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}
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uid := packet.NewUserId(name, comment, email)
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if uid == nil {
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return nil, errors.InvalidArgumentError("user id field contained invalid characters")
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}
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signingPriv, err := rsa.GenerateKey(config.Random(), bits)
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if err != nil {
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return nil, err
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}
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encryptingPriv, err := rsa.GenerateKey(config.Random(), bits)
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if err != nil {
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return nil, err
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}
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e := &Entity{
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PrimaryKey: packet.NewRSAPublicKey(creationTime, &signingPriv.PublicKey),
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PrivateKey: packet.NewRSAPrivateKey(creationTime, signingPriv),
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Identities: make(map[string]*Identity),
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}
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isPrimaryId := true
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e.Identities[uid.Id] = &Identity{
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Name: uid.Id,
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UserId: uid,
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SelfSignature: &packet.Signature{
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CreationTime: creationTime,
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SigType: packet.SigTypePositiveCert,
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PubKeyAlgo: packet.PubKeyAlgoRSA,
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Hash: config.Hash(),
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IsPrimaryId: &isPrimaryId,
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FlagsValid: true,
|
|
FlagSign: true,
|
|
FlagCertify: true,
|
|
IssuerKeyId: &e.PrimaryKey.KeyId,
|
|
},
|
|
}
|
|
err = e.Identities[uid.Id].SelfSignature.SignUserId(uid.Id, e.PrimaryKey, e.PrivateKey, config)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// If the user passes in a DefaultHash via packet.Config,
|
|
// set the PreferredHash for the SelfSignature.
|
|
if config != nil && config.DefaultHash != 0 {
|
|
e.Identities[uid.Id].SelfSignature.PreferredHash = []uint8{hashToHashId(config.DefaultHash)}
|
|
}
|
|
|
|
// Likewise for DefaultCipher.
|
|
if config != nil && config.DefaultCipher != 0 {
|
|
e.Identities[uid.Id].SelfSignature.PreferredSymmetric = []uint8{uint8(config.DefaultCipher)}
|
|
}
|
|
|
|
e.Subkeys = make([]Subkey, 1)
|
|
e.Subkeys[0] = Subkey{
|
|
PublicKey: packet.NewRSAPublicKey(creationTime, &encryptingPriv.PublicKey),
|
|
PrivateKey: packet.NewRSAPrivateKey(creationTime, encryptingPriv),
|
|
Sig: &packet.Signature{
|
|
CreationTime: creationTime,
|
|
SigType: packet.SigTypeSubkeyBinding,
|
|
PubKeyAlgo: packet.PubKeyAlgoRSA,
|
|
Hash: config.Hash(),
|
|
FlagsValid: true,
|
|
FlagEncryptStorage: true,
|
|
FlagEncryptCommunications: true,
|
|
IssuerKeyId: &e.PrimaryKey.KeyId,
|
|
},
|
|
}
|
|
e.Subkeys[0].PublicKey.IsSubkey = true
|
|
e.Subkeys[0].PrivateKey.IsSubkey = true
|
|
err = e.Subkeys[0].Sig.SignKey(e.Subkeys[0].PublicKey, e.PrivateKey, config)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return e, nil
|
|
}
|
|
|
|
// SerializePrivate serializes an Entity, including private key material, but
|
|
// excluding signatures from other entities, to the given Writer.
|
|
// Identities and subkeys are re-signed in case they changed since NewEntry.
|
|
// If config is nil, sensible defaults will be used.
|
|
func (e *Entity) SerializePrivate(w io.Writer, config *packet.Config) (err error) {
|
|
err = e.PrivateKey.Serialize(w)
|
|
if err != nil {
|
|
return
|
|
}
|
|
for _, ident := range e.Identities {
|
|
err = ident.UserId.Serialize(w)
|
|
if err != nil {
|
|
return
|
|
}
|
|
err = ident.SelfSignature.SignUserId(ident.UserId.Id, e.PrimaryKey, e.PrivateKey, config)
|
|
if err != nil {
|
|
return
|
|
}
|
|
err = ident.SelfSignature.Serialize(w)
|
|
if err != nil {
|
|
return
|
|
}
|
|
}
|
|
for _, subkey := range e.Subkeys {
|
|
err = subkey.PrivateKey.Serialize(w)
|
|
if err != nil {
|
|
return
|
|
}
|
|
err = subkey.Sig.SignKey(subkey.PublicKey, e.PrivateKey, config)
|
|
if err != nil {
|
|
return
|
|
}
|
|
err = subkey.Sig.Serialize(w)
|
|
if err != nil {
|
|
return
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Serialize writes the public part of the given Entity to w, including
|
|
// signatures from other entities. No private key material will be output.
|
|
func (e *Entity) Serialize(w io.Writer) error {
|
|
err := e.PrimaryKey.Serialize(w)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, ident := range e.Identities {
|
|
err = ident.UserId.Serialize(w)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
err = ident.SelfSignature.Serialize(w)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, sig := range ident.Signatures {
|
|
err = sig.Serialize(w)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
for _, subkey := range e.Subkeys {
|
|
err = subkey.PublicKey.Serialize(w)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
err = subkey.Sig.Serialize(w)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// SignIdentity adds a signature to e, from signer, attesting that identity is
|
|
// associated with e. The provided identity must already be an element of
|
|
// e.Identities and the private key of signer must have been decrypted if
|
|
// necessary.
|
|
// If config is nil, sensible defaults will be used.
|
|
func (e *Entity) SignIdentity(identity string, signer *Entity, config *packet.Config) error {
|
|
if signer.PrivateKey == nil {
|
|
return errors.InvalidArgumentError("signing Entity must have a private key")
|
|
}
|
|
if signer.PrivateKey.Encrypted {
|
|
return errors.InvalidArgumentError("signing Entity's private key must be decrypted")
|
|
}
|
|
ident, ok := e.Identities[identity]
|
|
if !ok {
|
|
return errors.InvalidArgumentError("given identity string not found in Entity")
|
|
}
|
|
|
|
sig := &packet.Signature{
|
|
SigType: packet.SigTypeGenericCert,
|
|
PubKeyAlgo: signer.PrivateKey.PubKeyAlgo,
|
|
Hash: config.Hash(),
|
|
CreationTime: config.Now(),
|
|
IssuerKeyId: &signer.PrivateKey.KeyId,
|
|
}
|
|
if err := sig.SignUserId(identity, e.PrimaryKey, signer.PrivateKey, config); err != nil {
|
|
return err
|
|
}
|
|
ident.Signatures = append(ident.Signatures, sig)
|
|
return nil
|
|
}
|