mirror of
https://github.com/go-gitea/gitea
synced 2024-12-24 17:44:27 +00:00
684b7a999f
* Dump: Use mholt/archive/v3 to support tar including many compressions Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Dump: Allow dump output to stdout Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Dump: Fixed bug present since #6677 where SessionConfig.Provider is never "file" Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Dump: never pack RepoRootPath, LFS.ContentPath and LogRootPath when they are below AppDataPath Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Dump: also dump LFS (fixes #10058) Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Dump: never dump CustomPath if CustomPath is a subdir of or equal to AppDataPath (fixes #10365) Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Use log.Info instead of fmt.Fprintf Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * import ordering * make fmt Co-authored-by: zeripath <art27@cantab.net> Co-authored-by: techknowlogick <techknowlogick@gitea.io> Co-authored-by: Matti R <matti@mdranta.net>
469 lines
11 KiB
Go
469 lines
11 KiB
Go
package rardecode
|
|
|
|
import (
|
|
"bufio"
|
|
"bytes"
|
|
"crypto/sha1"
|
|
"errors"
|
|
"hash"
|
|
"hash/crc32"
|
|
"io"
|
|
"io/ioutil"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
"unicode/utf16"
|
|
)
|
|
|
|
const (
|
|
// block types
|
|
blockArc = 0x73
|
|
blockFile = 0x74
|
|
blockService = 0x7a
|
|
blockEnd = 0x7b
|
|
|
|
// block flags
|
|
blockHasData = 0x8000
|
|
|
|
// archive block flags
|
|
arcVolume = 0x0001
|
|
arcSolid = 0x0008
|
|
arcNewNaming = 0x0010
|
|
arcEncrypted = 0x0080
|
|
|
|
// file block flags
|
|
fileSplitBefore = 0x0001
|
|
fileSplitAfter = 0x0002
|
|
fileEncrypted = 0x0004
|
|
fileSolid = 0x0010
|
|
fileWindowMask = 0x00e0
|
|
fileLargeData = 0x0100
|
|
fileUnicode = 0x0200
|
|
fileSalt = 0x0400
|
|
fileVersion = 0x0800
|
|
fileExtTime = 0x1000
|
|
|
|
// end block flags
|
|
endArcNotLast = 0x0001
|
|
|
|
saltSize = 8 // size of salt for calculating AES keys
|
|
cacheSize30 = 4 // number of AES keys to cache
|
|
hashRounds = 0x40000
|
|
)
|
|
|
|
var (
|
|
errMultipleDecoders = errors.New("rardecode: multiple decoders in a single archive not supported")
|
|
)
|
|
|
|
type blockHeader15 struct {
|
|
htype byte // block header type
|
|
flags uint16
|
|
data readBuf // header data
|
|
dataSize int64 // size of extra block data
|
|
}
|
|
|
|
// fileHash32 implements fileChecksum for 32-bit hashes
|
|
type fileHash32 struct {
|
|
hash.Hash32 // hash to write file contents to
|
|
sum uint32 // 32bit checksum for file
|
|
}
|
|
|
|
func (h *fileHash32) valid() bool {
|
|
return h.sum == h.Sum32()
|
|
}
|
|
|
|
// archive15 implements fileBlockReader for RAR 1.5 file format archives
|
|
type archive15 struct {
|
|
byteReader // reader for current block data
|
|
v *bufio.Reader // reader for current archive volume
|
|
dec decoder // current decoder
|
|
decVer byte // current decoder version
|
|
multi bool // archive is multi-volume
|
|
old bool // archive uses old naming scheme
|
|
solid bool // archive is a solid archive
|
|
encrypted bool
|
|
pass []uint16 // password in UTF-16
|
|
checksum fileHash32 // file checksum
|
|
buf readBuf // temporary buffer
|
|
keyCache [cacheSize30]struct { // cache of previously calculated decryption keys
|
|
salt []byte
|
|
key []byte
|
|
iv []byte
|
|
}
|
|
}
|
|
|
|
// Calculates the key and iv for AES decryption given a password and salt.
|
|
func calcAes30Params(pass []uint16, salt []byte) (key, iv []byte) {
|
|
p := make([]byte, 0, len(pass)*2+len(salt))
|
|
for _, v := range pass {
|
|
p = append(p, byte(v), byte(v>>8))
|
|
}
|
|
p = append(p, salt...)
|
|
|
|
hash := sha1.New()
|
|
iv = make([]byte, 16)
|
|
s := make([]byte, 0, hash.Size())
|
|
for i := 0; i < hashRounds; i++ {
|
|
hash.Write(p)
|
|
hash.Write([]byte{byte(i), byte(i >> 8), byte(i >> 16)})
|
|
if i%(hashRounds/16) == 0 {
|
|
s = hash.Sum(s[:0])
|
|
iv[i/(hashRounds/16)] = s[4*4+3]
|
|
}
|
|
}
|
|
key = hash.Sum(s[:0])
|
|
key = key[:16]
|
|
|
|
for k := key; len(k) >= 4; k = k[4:] {
|
|
k[0], k[1], k[2], k[3] = k[3], k[2], k[1], k[0]
|
|
}
|
|
return key, iv
|
|
}
|
|
|
|
// parseDosTime converts a 32bit DOS time value to time.Time
|
|
func parseDosTime(t uint32) time.Time {
|
|
n := int(t)
|
|
sec := n & 0x1f << 1
|
|
min := n >> 5 & 0x3f
|
|
hr := n >> 11 & 0x1f
|
|
day := n >> 16 & 0x1f
|
|
mon := time.Month(n >> 21 & 0x0f)
|
|
yr := n>>25&0x7f + 1980
|
|
return time.Date(yr, mon, day, hr, min, sec, 0, time.Local)
|
|
}
|
|
|
|
// decodeName decodes a non-unicode filename from a file header.
|
|
func decodeName(buf []byte) string {
|
|
i := bytes.IndexByte(buf, 0)
|
|
if i < 0 {
|
|
return string(buf) // filename is UTF-8
|
|
}
|
|
|
|
name := buf[:i]
|
|
encName := readBuf(buf[i+1:])
|
|
if len(encName) < 2 {
|
|
return "" // invalid encoding
|
|
}
|
|
highByte := uint16(encName.byte()) << 8
|
|
flags := encName.byte()
|
|
flagBits := 8
|
|
var wchars []uint16 // decoded characters are UTF-16
|
|
for len(wchars) < len(name) && len(encName) > 0 {
|
|
if flagBits == 0 {
|
|
flags = encName.byte()
|
|
flagBits = 8
|
|
if len(encName) == 0 {
|
|
break
|
|
}
|
|
}
|
|
switch flags >> 6 {
|
|
case 0:
|
|
wchars = append(wchars, uint16(encName.byte()))
|
|
case 1:
|
|
wchars = append(wchars, uint16(encName.byte())|highByte)
|
|
case 2:
|
|
if len(encName) < 2 {
|
|
break
|
|
}
|
|
wchars = append(wchars, encName.uint16())
|
|
case 3:
|
|
n := encName.byte()
|
|
b := name[len(wchars):]
|
|
if l := int(n&0x7f) + 2; l < len(b) {
|
|
b = b[:l]
|
|
}
|
|
if n&0x80 > 0 {
|
|
if len(encName) < 1 {
|
|
break
|
|
}
|
|
ec := encName.byte()
|
|
for _, c := range b {
|
|
wchars = append(wchars, uint16(c+ec)|highByte)
|
|
}
|
|
} else {
|
|
for _, c := range b {
|
|
wchars = append(wchars, uint16(c))
|
|
}
|
|
}
|
|
}
|
|
flags <<= 2
|
|
flagBits -= 2
|
|
}
|
|
return string(utf16.Decode(wchars))
|
|
}
|
|
|
|
// readExtTimes reads and parses the optional extra time field from the file header.
|
|
func readExtTimes(f *fileBlockHeader, b *readBuf) {
|
|
if len(*b) < 2 {
|
|
return // invalid, not enough data
|
|
}
|
|
flags := b.uint16()
|
|
|
|
ts := []*time.Time{&f.ModificationTime, &f.CreationTime, &f.AccessTime}
|
|
|
|
for i, t := range ts {
|
|
n := flags >> uint((3-i)*4)
|
|
if n&0x8 == 0 {
|
|
continue
|
|
}
|
|
if i != 0 { // ModificationTime already read so skip
|
|
if len(*b) < 4 {
|
|
return // invalid, not enough data
|
|
}
|
|
*t = parseDosTime(b.uint32())
|
|
}
|
|
if n&0x4 > 0 {
|
|
*t = t.Add(time.Second)
|
|
}
|
|
n &= 0x3
|
|
if n == 0 {
|
|
continue
|
|
}
|
|
if len(*b) < int(n) {
|
|
return // invalid, not enough data
|
|
}
|
|
// add extra time data in 100's of nanoseconds
|
|
d := time.Duration(0)
|
|
for j := 3 - n; j < n; j++ {
|
|
d |= time.Duration(b.byte()) << (j * 8)
|
|
}
|
|
d *= 100
|
|
*t = t.Add(d)
|
|
}
|
|
}
|
|
|
|
func (a *archive15) getKeys(salt []byte) (key, iv []byte) {
|
|
// check cache of keys
|
|
for _, v := range a.keyCache {
|
|
if bytes.Equal(v.salt[:], salt) {
|
|
return v.key, v.iv
|
|
}
|
|
}
|
|
key, iv = calcAes30Params(a.pass, salt)
|
|
|
|
// save a copy in the cache
|
|
copy(a.keyCache[1:], a.keyCache[:])
|
|
a.keyCache[0].salt = append([]byte(nil), salt...) // copy so byte slice can be reused
|
|
a.keyCache[0].key = key
|
|
a.keyCache[0].iv = iv
|
|
|
|
return key, iv
|
|
}
|
|
|
|
func (a *archive15) parseFileHeader(h *blockHeader15) (*fileBlockHeader, error) {
|
|
f := new(fileBlockHeader)
|
|
|
|
f.first = h.flags&fileSplitBefore == 0
|
|
f.last = h.flags&fileSplitAfter == 0
|
|
|
|
f.solid = h.flags&fileSolid > 0
|
|
f.IsDir = h.flags&fileWindowMask == fileWindowMask
|
|
if !f.IsDir {
|
|
f.winSize = uint(h.flags&fileWindowMask)>>5 + 16
|
|
}
|
|
|
|
b := h.data
|
|
if len(b) < 21 {
|
|
return nil, errCorruptFileHeader
|
|
}
|
|
|
|
f.PackedSize = h.dataSize
|
|
f.UnPackedSize = int64(b.uint32())
|
|
f.HostOS = b.byte() + 1
|
|
if f.HostOS > HostOSBeOS {
|
|
f.HostOS = HostOSUnknown
|
|
}
|
|
a.checksum.sum = b.uint32()
|
|
|
|
f.ModificationTime = parseDosTime(b.uint32())
|
|
unpackver := b.byte() // decoder version
|
|
method := b.byte() - 0x30 // decryption method
|
|
namesize := int(b.uint16())
|
|
f.Attributes = int64(b.uint32())
|
|
if h.flags&fileLargeData > 0 {
|
|
if len(b) < 8 {
|
|
return nil, errCorruptFileHeader
|
|
}
|
|
_ = b.uint32() // already read large PackedSize in readBlockHeader
|
|
f.UnPackedSize |= int64(b.uint32()) << 32
|
|
f.UnKnownSize = f.UnPackedSize == -1
|
|
} else if int32(f.UnPackedSize) == -1 {
|
|
f.UnKnownSize = true
|
|
f.UnPackedSize = -1
|
|
}
|
|
if len(b) < namesize {
|
|
return nil, errCorruptFileHeader
|
|
}
|
|
name := b.bytes(namesize)
|
|
if h.flags&fileUnicode == 0 {
|
|
f.Name = string(name)
|
|
} else {
|
|
f.Name = decodeName(name)
|
|
}
|
|
// Rar 4.x uses '\' as file separator
|
|
f.Name = strings.Replace(f.Name, "\\", "/", -1)
|
|
|
|
if h.flags&fileVersion > 0 {
|
|
// file version is stored as ';n' appended to file name
|
|
i := strings.LastIndex(f.Name, ";")
|
|
if i > 0 {
|
|
j, err := strconv.Atoi(f.Name[i+1:])
|
|
if err == nil && j >= 0 {
|
|
f.Version = j
|
|
f.Name = f.Name[:i]
|
|
}
|
|
}
|
|
}
|
|
|
|
var salt []byte
|
|
if h.flags&fileSalt > 0 {
|
|
if len(b) < saltSize {
|
|
return nil, errCorruptFileHeader
|
|
}
|
|
salt = b.bytes(saltSize)
|
|
}
|
|
if h.flags&fileExtTime > 0 {
|
|
readExtTimes(f, &b)
|
|
}
|
|
|
|
if !f.first {
|
|
return f, nil
|
|
}
|
|
// fields only needed for first block in a file
|
|
if h.flags&fileEncrypted > 0 && len(salt) == saltSize {
|
|
f.key, f.iv = a.getKeys(salt)
|
|
}
|
|
a.checksum.Reset()
|
|
f.cksum = &a.checksum
|
|
if method == 0 {
|
|
return f, nil
|
|
}
|
|
if a.dec == nil {
|
|
switch unpackver {
|
|
case 15, 20, 26:
|
|
return nil, errUnsupportedDecoder
|
|
case 29:
|
|
a.dec = new(decoder29)
|
|
default:
|
|
return nil, errUnknownDecoder
|
|
}
|
|
a.decVer = unpackver
|
|
} else if a.decVer != unpackver {
|
|
return nil, errMultipleDecoders
|
|
}
|
|
f.decoder = a.dec
|
|
return f, nil
|
|
}
|
|
|
|
// readBlockHeader returns the next block header in the archive.
|
|
// It will return io.EOF if there were no bytes read.
|
|
func (a *archive15) readBlockHeader() (*blockHeader15, error) {
|
|
var err error
|
|
b := a.buf[:7]
|
|
r := io.Reader(a.v)
|
|
if a.encrypted {
|
|
salt := a.buf[:saltSize]
|
|
_, err = io.ReadFull(r, salt)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
key, iv := a.getKeys(salt)
|
|
r = newAesDecryptReader(r, key, iv)
|
|
err = readFull(r, b)
|
|
} else {
|
|
_, err = io.ReadFull(r, b)
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
crc := b.uint16()
|
|
hash := crc32.NewIEEE()
|
|
hash.Write(b)
|
|
h := new(blockHeader15)
|
|
h.htype = b.byte()
|
|
h.flags = b.uint16()
|
|
size := b.uint16()
|
|
if size < 7 {
|
|
return nil, errCorruptHeader
|
|
}
|
|
size -= 7
|
|
if int(size) > cap(a.buf) {
|
|
a.buf = readBuf(make([]byte, size))
|
|
}
|
|
h.data = a.buf[:size]
|
|
if err := readFull(r, h.data); err != nil {
|
|
return nil, err
|
|
}
|
|
hash.Write(h.data)
|
|
if crc != uint16(hash.Sum32()) {
|
|
return nil, errBadHeaderCrc
|
|
}
|
|
if h.flags&blockHasData > 0 {
|
|
if len(h.data) < 4 {
|
|
return nil, errCorruptHeader
|
|
}
|
|
h.dataSize = int64(h.data.uint32())
|
|
}
|
|
if (h.htype == blockService || h.htype == blockFile) && h.flags&fileLargeData > 0 {
|
|
if len(h.data) < 25 {
|
|
return nil, errCorruptHeader
|
|
}
|
|
b := h.data[21:25]
|
|
h.dataSize |= int64(b.uint32()) << 32
|
|
}
|
|
return h, nil
|
|
}
|
|
|
|
// next advances to the next file block in the archive
|
|
func (a *archive15) next() (*fileBlockHeader, error) {
|
|
for {
|
|
// could return an io.EOF here as 1.5 archives may not have an end block.
|
|
h, err := a.readBlockHeader()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
a.byteReader = limitByteReader(a.v, h.dataSize) // reader for block data
|
|
|
|
switch h.htype {
|
|
case blockFile:
|
|
return a.parseFileHeader(h)
|
|
case blockArc:
|
|
a.encrypted = h.flags&arcEncrypted > 0
|
|
a.multi = h.flags&arcVolume > 0
|
|
a.old = h.flags&arcNewNaming == 0
|
|
a.solid = h.flags&arcSolid > 0
|
|
case blockEnd:
|
|
if h.flags&endArcNotLast == 0 || !a.multi {
|
|
return nil, errArchiveEnd
|
|
}
|
|
return nil, errArchiveContinues
|
|
default:
|
|
_, err = io.Copy(ioutil.Discard, a.byteReader)
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
}
|
|
|
|
func (a *archive15) version() int { return fileFmt15 }
|
|
|
|
func (a *archive15) reset() {
|
|
a.encrypted = false // reset encryption when opening new volume file
|
|
}
|
|
|
|
func (a *archive15) isSolid() bool {
|
|
return a.solid
|
|
}
|
|
|
|
// newArchive15 creates a new fileBlockReader for a Version 1.5 archive
|
|
func newArchive15(r *bufio.Reader, password string) fileBlockReader {
|
|
a := new(archive15)
|
|
a.v = r
|
|
a.pass = utf16.Encode([]rune(password)) // convert to UTF-16
|
|
a.checksum.Hash32 = crc32.NewIEEE()
|
|
a.buf = readBuf(make([]byte, 100))
|
|
return a
|
|
}
|