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/*
Hockeypuck - OpenPGP key server
Copyright (C) 2012-2014 Casey Marshall
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, version 3.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package openpgp
import (
"bytes"
"crypto/sha256"
"database/sql"
"io"
"strings"
"time"
"code.google.com/p/go.crypto/openpgp/packet"
)
type UserAttribute struct {
ScopedDigest string `db:"uuid"` // immutable
Creation time.Time `db:"creation"` // mutable (derived from latest sigs)
Expiration time.Time `db:"expiration"` // mutable
State int `db:"state"` // mutable
Packet []byte `db:"packet"` // immutable
PubkeyRFP string `db:"pubkey_uuid"` // immutable
RevSigDigest sql.NullString `db:"revsig_uuid"` // mutable
/* Cross-references */
revSig *Signature `db:"-"`
selfSignature *Signature `db:"-"`
signatures []*Signature `db:"-"`
/* Parsed packet data */
UserAttribute *packet.UserAttribute
}
func (uat *UserAttribute) calcScopedDigest(pubkey *Pubkey) string {
h := sha256.New()
h.Write([]byte(pubkey.RFingerprint))
h.Write([]byte("{uat}"))
h.Write(uat.Packet)
return toAscii85String(h.Sum(nil))
}
func (uat *UserAttribute) Serialize(w io.Writer) error {
_, err := w.Write(uat.Packet)
return err
}
func (uat *UserAttribute) Uuid() string { return uat.ScopedDigest }
func (uat *UserAttribute) GetOpaquePacket() (*packet.OpaquePacket, error) {
return toOpaquePacket(uat.Packet)
}
func (uat *UserAttribute) GetPacket() (packet.Packet, error) {
if uat.UserAttribute != nil {
return uat.UserAttribute, nil
}
return nil, ErrPacketRecordState
}
func (uat *UserAttribute) setPacket(p packet.Packet) error {
u, is := p.(*packet.UserAttribute)
if !is {
return ErrInvalidPacketType
}
uat.UserAttribute = u
return nil
}
func (uat *UserAttribute) Read() (err error) {
buf := bytes.NewBuffer(uat.Packet)
var p packet.Packet
if p, err = packet.Read(buf); err != nil {
return err
}
return uat.setPacket(p)
}
func NewUserAttribute(op *packet.OpaquePacket) (uat *UserAttribute, err error) {
var buf bytes.Buffer
if err = op.Serialize(&buf); err != nil {
return
}
uat = &UserAttribute{Packet: buf.Bytes()}
var p packet.Packet
if p, err = op.Parse(); err != nil {
return
}
if err = uat.setPacket(p); err != nil {
return
}
return uat, uat.init()
}
func (uat *UserAttribute) init() (err error) {
uat.Creation = NeverExpires
uat.Expiration = time.Unix(0, 0)
return
}
func (uat *UserAttribute) Visit(visitor PacketVisitor) (err error) {
err = visitor(uat)
if err != nil {
return
}
for _, sig := range uat.signatures {
err = sig.Visit(visitor)
if err != nil {
return
}
}
return
}
func (uat *UserAttribute) AddSignature(sig *Signature) {
uat.signatures = append(uat.signatures, sig)
}
func (uat *UserAttribute) RemoveSignature(sig *Signature) {
uat.signatures = removeSignature(uat.signatures, sig)
}
func (uat *UserAttribute) linkSelfSigs(pubkey *Pubkey) {
for _, sig := range uat.signatures {
if !strings.HasPrefix(pubkey.RFingerprint, sig.RIssuerKeyId) {
continue
}
if sig.SigType == 0x30 { // TODO: add packet.SigTypeCertRevocation
if uat.revSig == nil || sig.Creation.Unix() > uat.revSig.Creation.Unix() {
if err := pubkey.verifyUserAttrSelfSig(uat, sig); err == nil {
uat.revSig = sig
uat.RevSigDigest = sql.NullString{sig.ScopedDigest, true}
}
}
}
}
for _, sig := range uat.signatures {
if !strings.HasPrefix(pubkey.RFingerprint, sig.RIssuerKeyId) {
continue
}
if time.Now().Unix() > sig.Expiration.Unix() {
// Ignore expired signatures
continue
}
if sig.SigType >= 0x10 && sig.SigType <= 0x13 {
if err := pubkey.verifyUserAttrSelfSig(uat, sig); err == nil {
if sig.Expiration.Unix() == NeverExpires.Unix() && sig.Signature != nil && sig.Signature.KeyLifetimeSecs != nil {
sig.Expiration = pubkey.Creation.Add(
time.Duration(*sig.Signature.KeyLifetimeSecs) * time.Second)
}
if uat.selfSignature == nil || sig.Creation.Unix() > uat.selfSignature.Creation.Unix() {
uat.selfSignature = sig
}
if uat.revSig != nil && sig.Creation.Unix() > uat.selfSignature.Creation.Unix() {
// A self-certification more recent than a revocation effectively cancels it.
uat.revSig = nil
uat.RevSigDigest = sql.NullString{"", false}
}
}
}
}
// Flag User Attributes without a self-signature
if uat.selfSignature == nil {
uat.State |= PacketStateNoSelfSig
}
}
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