diff options
| -rw-r--r-- | encrypt.go | 304 | ||||
| -rw-r--r-- | excelize.go | 47 | ||||
| -rw-r--r-- | excelize_test.go | 16 | ||||
| -rw-r--r-- | go.mod | 19 | ||||
| -rw-r--r-- | go.sum | 48 | ||||
| -rw-r--r-- | test/encryptSHA1.xlsx | bin | 0 -> 14336 bytes |
6 files changed, 372 insertions, 62 deletions
diff --git a/encrypt.go b/encrypt.go new file mode 100644 index 0000000..e5dc2af --- /dev/null +++ b/encrypt.go @@ -0,0 +1,304 @@ +// Copyright 2016 - 2020 The excelize 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 excelize providing a set of functions that allow you to write to +// and read from XLSX files. Support reads and writes XLSX file generated by +// Microsoft Excel™ 2007 and later. Support save file without losing original +// charts of XLSX. This library needs Go version 1.10 or later. + +package excelize + +import ( + "bytes" + "crypto/aes" + "crypto/cipher" + "crypto/md5" + "crypto/sha1" + "crypto/sha256" + "crypto/sha512" + "encoding/base64" + "encoding/binary" + "encoding/xml" + "hash" + "strings" + + "github.com/richardlehane/mscfb" + "golang.org/x/crypto/md4" + "golang.org/x/crypto/ripemd160" + "golang.org/x/text/encoding/unicode" +) + +var ( + blockKey = []byte{0x14, 0x6e, 0x0b, 0xe7, 0xab, 0xac, 0xd0, 0xd6} // Block keys used for encryption + packageOffset = 8 // First 8 bytes are the size of the stream + packageEncryptionChunkSize = 4096 + cryptoIdentifier = []byte{ // checking protect workbook by [MS-OFFCRYPTO] - v20181211 3.1 FeatureIdentifier + 0x3c, 0x00, 0x00, 0x00, 0x4d, 0x00, 0x69, 0x00, 0x63, 0x00, 0x72, 0x00, 0x6f, 0x00, 0x73, 0x00, + 0x6f, 0x00, 0x66, 0x00, 0x74, 0x00, 0x2e, 0x00, 0x43, 0x00, 0x6f, 0x00, 0x6e, 0x00, 0x74, 0x00, + 0x61, 0x00, 0x69, 0x00, 0x6e, 0x00, 0x65, 0x00, 0x72, 0x00, 0x2e, 0x00, 0x44, 0x00, 0x61, 0x00, + 0x74, 0x00, 0x61, 0x00, 0x53, 0x00, 0x70, 0x00, 0x61, 0x00, 0x63, 0x00, 0x65, 0x00, 0x73, 0x00, + 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, + } +) + +// Encryption specifies the encryption structure, streams, and storages are +// required when encrypting ECMA-376 documents. +type Encryption struct { + KeyData KeyData `xml:"keyData"` + DataIntegrity DataIntegrity `xml:"dataIntegrity"` + KeyEncryptors KeyEncryptors `xml:"keyEncryptors"` +} + +// KeyData specifies the cryptographic attributes used to encrypt the data. +type KeyData struct { + SaltSize int `xml:"saltSize,attr"` + BlockSize int `xml:"blockSize,attr"` + KeyBits int `xml:"keyBits,attr"` + HashSize int `xml:"hashSize,attr"` + CipherAlgorithm string `xml:"cipherAlgorithm,attr"` + CipherChaining string `xml:"cipherChaining,attr"` + HashAlgorithm string `xml:"hashAlgorithm,attr"` + SaltValue string `xml:"saltValue,attr"` +} + +// DataIntegrity specifies the encrypted copies of the salt and hash values +// used to help ensure that the integrity of the encrypted data has not been +// compromised. +type DataIntegrity struct { + EncryptedHmacKey string `xml:"encryptedHmacKey,attr"` + EncryptedHmacValue string `xml:"encryptedHmacValue,attr"` +} + +// KeyEncryptors specifies the key encryptors used to encrypt the data. +type KeyEncryptors struct { + KeyEncryptor []KeyEncryptor `xml:"keyEncryptor"` +} + +// KeyEncryptor specifies that the schema used by this encryptor is the schema +// specified for password-based encryptors. +type KeyEncryptor struct { + XMLName xml.Name `xml:"keyEncryptor"` + URI string `xml:"uri,attr"` + EncryptedKey EncryptedKey `xml:"encryptedKey"` +} + +// EncryptedKey used to generate the encrypting key. +type EncryptedKey struct { + XMLName xml.Name `xml:"http://schemas.microsoft.com/office/2006/keyEncryptor/password encryptedKey"` + SpinCount int `xml:"spinCount,attr"` + EncryptedVerifierHashInput string `xml:"encryptedVerifierHashInput,attr"` + EncryptedVerifierHashValue string `xml:"encryptedVerifierHashValue,attr"` + EncryptedKeyValue string `xml:"encryptedKeyValue,attr"` + KeyData +} + +// Decrypt API decrypt the CFB file format with Agile Encryption. Support +// cryptographic algorithm: MD4, MD5, RIPEMD-160, SHA1, SHA256, SHA384 and +// SHA512. +func Decrypt(raw []byte, opt *Options) (packageBuf []byte, err error) { + doc, err := mscfb.New(bytes.NewReader(raw)) + if err != nil { + return + } + encryptionInfoBuf, encryptedPackageBuf := extractPart(doc) + var encryptionInfo Encryption + if encryptionInfo, err = parseEncryptionInfo(encryptionInfoBuf[8:]); err != nil { + return + } + // Convert the password into an encryption key. + key, err := convertPasswdToKey(opt.Password, encryptionInfo) + if err != nil { + return + } + // Use the key to decrypt the package key. + encryptedKey := encryptionInfo.KeyEncryptors.KeyEncryptor[0].EncryptedKey + saltValue, err := base64.StdEncoding.DecodeString(encryptedKey.SaltValue) + if err != nil { + return + } + encryptedKeyValue, err := base64.StdEncoding.DecodeString(encryptedKey.EncryptedKeyValue) + if err != nil { + return + } + packageKey, err := crypt(false, encryptedKey.CipherAlgorithm, encryptedKey.CipherChaining, key, saltValue, encryptedKeyValue) + // Use the package key to decrypt the package. + return cryptPackage(false, packageKey, encryptedPackageBuf, encryptionInfo) +} + +// extractPart extract data from storage by specified part name. +func extractPart(doc *mscfb.Reader) (encryptionInfoBuf, encryptedPackageBuf []byte) { + for entry, err := doc.Next(); err == nil; entry, err = doc.Next() { + switch entry.Name { + case "EncryptionInfo": + buf := make([]byte, entry.Size) + i, _ := doc.Read(buf) + if i > 0 { + encryptionInfoBuf = buf + break + } + case "EncryptedPackage": + buf := make([]byte, entry.Size) + i, _ := doc.Read(buf) + if i > 0 { + encryptedPackageBuf = buf + break + } + } + } + return +} + +// convertPasswdToKey convert the password into an encryption key. +func convertPasswdToKey(passwd string, encryption Encryption) (key []byte, err error) { + var b bytes.Buffer + saltValue, err := base64.StdEncoding.DecodeString(encryption.KeyEncryptors.KeyEncryptor[0].EncryptedKey.SaltValue) + if err != nil { + return + } + b.Write(saltValue) + encoder := unicode.UTF16(unicode.LittleEndian, unicode.IgnoreBOM).NewEncoder() + passwordBuffer, err := encoder.Bytes([]byte(passwd)) + if err != nil { + return + } + b.Write(passwordBuffer) + // Generate the initial hash. + key = hashing(encryption.KeyData.HashAlgorithm, b.Bytes()) + // Now regenerate until spin count. + for i := 0; i < encryption.KeyEncryptors.KeyEncryptor[0].EncryptedKey.SpinCount; i++ { + iterator := createUInt32LEBuffer(i) + key = hashing(encryption.KeyData.HashAlgorithm, iterator, key) + } + // Now generate the final hash. + key = hashing(encryption.KeyData.HashAlgorithm, key, blockKey) + // Truncate or pad as needed to get to length of keyBits. + keyBytes := encryption.KeyEncryptors.KeyEncryptor[0].EncryptedKey.KeyBits / 8 + if len(key) < keyBytes { + tmp := make([]byte, 0x36) + key = append(key, tmp...) + key = tmp + } else if len(key) > keyBytes { + key = key[:keyBytes] + } + return +} + +// hashing data by specified hash algorithm. +func hashing(hashAlgorithm string, buffer ...[]byte) (key []byte) { + var hashMap = map[string]hash.Hash{ + "md4": md4.New(), + "md5": md5.New(), + "ripemd-160": ripemd160.New(), + "sha1": sha1.New(), + "sha256": sha256.New(), + "sha384": sha512.New384(), + "sha512": sha512.New(), + } + handler, ok := hashMap[strings.ToLower(hashAlgorithm)] + if !ok { + return key + } + for _, buf := range buffer { + handler.Write(buf) + } + key = handler.Sum(nil) + return key +} + +// createUInt32LEBuffer create buffer with little endian 32-bit unsigned +// integer. +func createUInt32LEBuffer(value int) []byte { + buf := make([]byte, 4) + binary.LittleEndian.PutUint32(buf, uint32(value)) + return buf +} + +// parseEncryptionInfo parse the encryption info XML into an object. +func parseEncryptionInfo(encryptionInfo []byte) (encryption Encryption, err error) { + err = xml.Unmarshal(encryptionInfo, &encryption) + return +} + +// crypt encrypt / decrypt input by given cipher algorithm, cipher chaining, +// key and initialization vector. +func crypt(encrypt bool, cipherAlgorithm, cipherChaining string, key, iv, input []byte) (packageKey []byte, err error) { + block, err := aes.NewCipher(key) + if err != nil { + return input, err + } + stream := cipher.NewCBCDecrypter(block, iv) + stream.CryptBlocks(input, input) + return input, nil +} + +// cryptPackage encrypt / decrypt package by given packageKey and encryption +// info. +func cryptPackage(encrypt bool, packageKey, input []byte, encryption Encryption) (outputChunks []byte, err error) { + encryptedKey := encryption.KeyData + var offset = packageOffset + if encrypt { + offset = 0 + } + var i, start, end int + var iv, outputChunk []byte + for end < len(input) { + start = end + end = start + packageEncryptionChunkSize + + if end > len(input) { + end = len(input) + } + // Grab the next chunk + var inputChunk []byte + if (end + offset) < len(input) { + inputChunk = input[start+offset : end+offset] + } else { + inputChunk = input[start+offset : end] + } + + // Pad the chunk if it is not an integer multiple of the block size + remainder := len(inputChunk) % encryptedKey.BlockSize + if remainder != 0 { + inputChunk = append(inputChunk, make([]byte, encryptedKey.BlockSize-remainder)...) + } + // Create the initialization vector + iv, err = createIV(encrypt, i, encryption) + if err != nil { + return + } + // Encrypt/decrypt the chunk and add it to the array + outputChunk, err = crypt(encrypt, encryptedKey.CipherAlgorithm, encryptedKey.CipherChaining, packageKey, iv, inputChunk) + if err != nil { + return + } + outputChunks = append(outputChunks, outputChunk...) + i++ + } + return +} + +// createIV create an initialization vector (IV). +func createIV(encrypt bool, blockKey int, encryption Encryption) ([]byte, error) { + encryptedKey := encryption.KeyData + // Create the block key from the current index + blockKeyBuf := createUInt32LEBuffer(blockKey) + var b bytes.Buffer + saltValue, err := base64.StdEncoding.DecodeString(encryptedKey.SaltValue) + if err != nil { + return nil, err + } + b.Write(saltValue) + b.Write(blockKeyBuf) + // Create the initialization vector by hashing the salt with the block key. + // Truncate or pad as needed to meet the block size. + iv := hashing(encryptedKey.HashAlgorithm, b.Bytes()) + if len(iv) < encryptedKey.BlockSize { + tmp := make([]byte, 0x36) + iv = append(iv, tmp...) + iv = tmp + } else if len(iv) > encryptedKey.BlockSize { + iv = iv[0:encryptedKey.BlockSize] + } + return iv, nil +} diff --git a/excelize.go b/excelize.go index 75b0c13..6e2b849 100644 --- a/excelize.go +++ b/excelize.go @@ -56,15 +56,30 @@ type File struct { type charsetTranscoderFn func(charset string, input io.Reader) (rdr io.Reader, err error) -// OpenFile take the name of an spreadsheet file and returns a populated -// spreadsheet file struct for it. -func OpenFile(filename string) (*File, error) { +// Options define the options for open spreadsheet. +type Options struct { + Password string +} + +// OpenFile take the name of an spreadsheet file and returns a populated spreadsheet file struct +// for it. For example, open spreadsheet with password protection: +// +// f, err := excelize.OpenFile("Book1.xlsx", excelize.Options{Password: "password"}) +// if err != nil { +// return +// } +// +func OpenFile(filename string, opt ...Options) (*File, error) { file, err := os.Open(filename) if err != nil { return nil, err } defer file.Close() - f, err := OpenReader(file) + var option Options + for _, o := range opt { + option = o + } + f, err := OpenReader(file, option) if err != nil { return nil, err } @@ -91,25 +106,23 @@ func newFile() *File { // OpenReader read data stream from io.Reader and return a populated // spreadsheet file. -func OpenReader(r io.Reader) (*File, error) { +func OpenReader(r io.Reader, opt ...Options) (*File, error) { b, err := ioutil.ReadAll(r) if err != nil { return nil, err } - - zr, err := zip.NewReader(bytes.NewReader(b), int64(len(b))) - if err != nil { - identifier := []byte{ - // checking protect workbook by [MS-OFFCRYPTO] - v20181211 3.1 FeatureIdentifier - 0x3c, 0x00, 0x00, 0x00, 0x4d, 0x00, 0x69, 0x00, 0x63, 0x00, 0x72, 0x00, 0x6f, 0x00, 0x73, 0x00, - 0x6f, 0x00, 0x66, 0x00, 0x74, 0x00, 0x2e, 0x00, 0x43, 0x00, 0x6f, 0x00, 0x6e, 0x00, 0x74, 0x00, - 0x61, 0x00, 0x69, 0x00, 0x6e, 0x00, 0x65, 0x00, 0x72, 0x00, 0x2e, 0x00, 0x44, 0x00, 0x61, 0x00, - 0x74, 0x00, 0x61, 0x00, 0x53, 0x00, 0x70, 0x00, 0x61, 0x00, 0x63, 0x00, 0x65, 0x00, 0x73, 0x00, - 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, + if bytes.Contains(b, cryptoIdentifier) { + var option Options + for _, o := range opt { + option = o } - if bytes.Contains(b, identifier) { - return nil, errors.New("not support encrypted file currently") + b, err = Decrypt(b, &option) + if err != nil { + return nil, fmt.Errorf("decrypted file failed") } + } + zr, err := zip.NewReader(bytes.NewReader(b), int64(len(b))) + if err != nil { return nil, err } diff --git a/excelize_test.go b/excelize_test.go index c2bd3ad..923e4c5 100644 --- a/excelize_test.go +++ b/excelize_test.go @@ -201,14 +201,14 @@ func TestCharsetTranscoder(t *testing.T) { func TestOpenReader(t *testing.T) { _, err := OpenReader(strings.NewReader("")) assert.EqualError(t, err, "zip: not a valid zip file") - _, err = OpenReader(bytes.NewReader([]byte{ - 0x3c, 0x00, 0x00, 0x00, 0x4d, 0x00, 0x69, 0x00, 0x63, 0x00, 0x72, 0x00, 0x6f, 0x00, 0x73, 0x00, - 0x6f, 0x00, 0x66, 0x00, 0x74, 0x00, 0x2e, 0x00, 0x43, 0x00, 0x6f, 0x00, 0x6e, 0x00, 0x74, 0x00, - 0x61, 0x00, 0x69, 0x00, 0x6e, 0x00, 0x65, 0x00, 0x72, 0x00, 0x2e, 0x00, 0x44, 0x00, 0x61, 0x00, - 0x74, 0x00, 0x61, 0x00, 0x53, 0x00, 0x70, 0x00, 0x61, 0x00, 0x63, 0x00, 0x65, 0x00, 0x73, 0x00, - 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, - })) - assert.EqualError(t, err, "not support encrypted file currently") + _, err = OpenReader(bytes.NewReader(cryptoIdentifier)) + assert.EqualError(t, err, "decrypted file failed") + + f, err := OpenFile(filepath.Join("test", "encryptSHA1.xlsx"), Options{Password: "password"}) + assert.NoError(t, err) + val, err := f.GetCellValue("Sheet1", "A1") + assert.NoError(t, err) + assert.Equal(t, "SECRET", val) // Test unexpected EOF. var b bytes.Buffer @@ -1,17 +1,14 @@ module github.com/360EntSecGroup-Skylar/excelize/v2 -go 1.12 +go 1.15 require ( - github.com/davecgh/go-spew v1.1.1 // indirect - github.com/kr/text v0.2.0 // indirect github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826 - github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect - github.com/stretchr/testify v1.5.1 - github.com/xuri/efp v0.0.0-20191019043341-b7dc4fe9aa91 - golang.org/x/image v0.0.0-20200430140353-33d19683fad8 - golang.org/x/net v0.0.0-20200506145744-7e3656a0809f - golang.org/x/text v0.3.2 // indirect - gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect - gopkg.in/yaml.v2 v2.2.8 // indirect + github.com/richardlehane/mscfb v1.0.3 + github.com/stretchr/testify v1.6.1 + github.com/xuri/efp v0.0.0-20200605144744-ba689101faaf + golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a + golang.org/x/image v0.0.0-20200801110659-972c09e46d76 + golang.org/x/net v0.0.0-20200822124328-c89045814202 + golang.org/x/text v0.3.3 ) @@ -1,39 +1,35 @@ -github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= +github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8= github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= -github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= -github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= -github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ= -github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE= -github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI= -github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY= -github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE= github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826 h1:RWengNIwukTxcDr9M+97sNutRR1RKhG96O6jWumTTnw= github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826/go.mod h1:TaXosZuwdSHYgviHp1DAtfrULt5eUgsSMsZf+YrPgl8= -github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e h1:fD57ERR4JtEqsWbfPhv4DMiApHyliiK5xCTNVSPiaAs= -github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno= github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= +github.com/richardlehane/mscfb v1.0.3 h1:rD8TBkYWkObWO0oLDFCbwMeZ4KoalxQy+QgniCj3nKI= +github.com/richardlehane/mscfb v1.0.3/go.mod h1:YzVpcZg9czvAuhk9T+a3avCpcFPMUWm7gK3DypaEsUk= +github.com/richardlehane/msoleps v1.0.1 h1:RfrALnSNXzmXLbGct/P2b4xkFz4e8Gmj/0Vj9M9xC1o= +github.com/richardlehane/msoleps v1.0.1/go.mod 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