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reader.go
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reader.go
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// Copyright 2011 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 packet
import (
"io"
"github.com/ProtonMail/go-crypto/openpgp/errors"
)
type PacketReader interface {
Next() (p Packet, err error)
Push(reader io.Reader) (err error)
Unread(p Packet)
}
// Reader reads packets from an io.Reader and allows packets to be 'unread' so
// that they result from the next call to Next.
type Reader struct {
q []Packet
readers []io.Reader
}
// New io.Readers are pushed when a compressed or encrypted packet is processed
// and recursively treated as a new source of packets. However, a carefully
// crafted packet can trigger an infinite recursive sequence of packets. See
// http://mumble.net/~campbell/misc/pgp-quine
// https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-4402
// This constant limits the number of recursive packets that may be pushed.
const maxReaders = 32
// Next returns the most recently unread Packet, or reads another packet from
// the top-most io.Reader. Unknown/unsupported/Marker packet types are skipped.
func (r *Reader) Next() (p Packet, err error) {
for {
p, err := r.read()
if err == io.EOF {
break
} else if err != nil {
if _, ok := err.(errors.UnknownPacketTypeError); ok {
continue
}
if _, ok := err.(errors.UnsupportedError); ok {
switch p.(type) {
case *SymmetricallyEncrypted, *AEADEncrypted, *Compressed, *LiteralData:
return nil, err
}
continue
}
return nil, err
} else {
//A marker packet MUST be ignored when received
switch p.(type) {
case *Marker:
continue
}
return p, nil
}
}
return nil, io.EOF
}
// Next returns the most recently unread Packet, or reads another packet from
// the top-most io.Reader. Unknown/Marker packet types are skipped while unsupported
// packets are returned as UnsupportedPacket type.
func (r *Reader) NextWithUnsupported() (p Packet, err error) {
for {
p, err = r.read()
if err == io.EOF {
break
} else if err != nil {
if _, ok := err.(errors.UnknownPacketTypeError); ok {
continue
}
if casteErr, ok := err.(errors.UnsupportedError); ok {
return &UnsupportedPacket{
IncompletePacket: p,
Error: casteErr,
}, nil
}
return
} else {
//A marker packet MUST be ignored when received
switch p.(type) {
case *Marker:
continue
}
return
}
}
return nil, io.EOF
}
func (r *Reader) read() (p Packet, err error) {
if len(r.q) > 0 {
p = r.q[len(r.q)-1]
r.q = r.q[:len(r.q)-1]
return
}
for len(r.readers) > 0 {
p, err = Read(r.readers[len(r.readers)-1])
if err == io.EOF {
r.readers = r.readers[:len(r.readers)-1]
continue
}
return p, err
}
return nil, io.EOF
}
// Push causes the Reader to start reading from a new io.Reader. When an EOF
// error is seen from the new io.Reader, it is popped and the Reader continues
// to read from the next most recent io.Reader. Push returns a StructuralError
// if pushing the reader would exceed the maximum recursion level, otherwise it
// returns nil.
func (r *Reader) Push(reader io.Reader) (err error) {
if len(r.readers) >= maxReaders {
return errors.StructuralError("too many layers of packets")
}
r.readers = append(r.readers, reader)
return nil
}
// Unread causes the given Packet to be returned from the next call to Next.
func (r *Reader) Unread(p Packet) {
r.q = append(r.q, p)
}
func NewReader(r io.Reader) *Reader {
return &Reader{
q: nil,
readers: []io.Reader{r},
}
}
// CheckReader is similar to Reader but additionally
// uses the pushdown automata to verify the read packet sequence.
type CheckReader struct {
Reader
verifier *SequenceVerifier
fullyRead bool
}
// Next returns the most recently unread Packet, or reads another packet from
// the top-most io.Reader. Unknown packet types are skipped.
// If the read packet sequence does not conform to the packet composition
// rules in rfc4880, it returns an error.
func (r *CheckReader) Next() (p Packet, err error) {
if r.fullyRead {
return nil, io.EOF
}
if len(r.q) > 0 {
p = r.q[len(r.q)-1]
r.q = r.q[:len(r.q)-1]
return
}
var errMsg error
for len(r.readers) > 0 {
p, errMsg, err = ReadWithCheck(r.readers[len(r.readers)-1], r.verifier)
if errMsg != nil {
err = errMsg
return
}
if err == nil {
return
}
if err == io.EOF {
r.readers = r.readers[:len(r.readers)-1]
continue
}
//A marker packet MUST be ignored when received
switch p.(type) {
case *Marker:
continue
}
if _, ok := err.(errors.UnknownPacketTypeError); ok {
continue
}
if _, ok := err.(errors.UnsupportedError); ok {
switch p.(type) {
case *SymmetricallyEncrypted, *AEADEncrypted, *Compressed, *LiteralData:
return nil, err
}
continue
}
return nil, err
}
if errMsg = r.verifier.Next(EOSSymbol); errMsg != nil {
return nil, errMsg
}
if errMsg = r.verifier.AssertValid(); errMsg != nil {
return nil, errMsg
}
r.fullyRead = true
return nil, io.EOF
}
func NewCheckReader(r io.Reader) *CheckReader {
return &CheckReader{
Reader: Reader{
q: nil,
readers: []io.Reader{r},
},
verifier: NewSequenceVerifier(),
fullyRead: false,
}
}