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503 lines
12 KiB
Go
503 lines
12 KiB
Go
package sprig
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import (
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"bytes"
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"crypto/aes"
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"crypto/cipher"
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"crypto/dsa"
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/hmac"
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha1"
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"crypto/sha256"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/asn1"
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"encoding/base64"
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"encoding/binary"
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"encoding/hex"
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"encoding/pem"
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"errors"
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"fmt"
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"io"
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"hash/adler32"
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"math/big"
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"net"
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"time"
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"github.com/google/uuid"
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"golang.org/x/crypto/scrypt"
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)
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func sha256sum(input string) string {
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hash := sha256.Sum256([]byte(input))
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return hex.EncodeToString(hash[:])
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}
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func sha1sum(input string) string {
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hash := sha1.Sum([]byte(input))
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return hex.EncodeToString(hash[:])
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}
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func adler32sum(input string) string {
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hash := adler32.Checksum([]byte(input))
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return fmt.Sprintf("%d", hash)
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}
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// uuidv4 provides a safe and secure UUID v4 implementation
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func uuidv4() string {
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return fmt.Sprintf("%s", uuid.New())
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}
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var master_password_seed = "com.lyndir.masterpassword"
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var password_type_templates = map[string][][]byte{
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"maximum": {[]byte("anoxxxxxxxxxxxxxxxxx"), []byte("axxxxxxxxxxxxxxxxxno")},
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"long": {[]byte("CvcvnoCvcvCvcv"), []byte("CvcvCvcvnoCvcv"), []byte("CvcvCvcvCvcvno"), []byte("CvccnoCvcvCvcv"), []byte("CvccCvcvnoCvcv"),
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[]byte("CvccCvcvCvcvno"), []byte("CvcvnoCvccCvcv"), []byte("CvcvCvccnoCvcv"), []byte("CvcvCvccCvcvno"), []byte("CvcvnoCvcvCvcc"),
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[]byte("CvcvCvcvnoCvcc"), []byte("CvcvCvcvCvccno"), []byte("CvccnoCvccCvcv"), []byte("CvccCvccnoCvcv"), []byte("CvccCvccCvcvno"),
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[]byte("CvcvnoCvccCvcc"), []byte("CvcvCvccnoCvcc"), []byte("CvcvCvccCvccno"), []byte("CvccnoCvcvCvcc"), []byte("CvccCvcvnoCvcc"),
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[]byte("CvccCvcvCvccno")},
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"medium": {[]byte("CvcnoCvc"), []byte("CvcCvcno")},
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"short": {[]byte("Cvcn")},
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"basic": {[]byte("aaanaaan"), []byte("aannaaan"), []byte("aaannaaa")},
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"pin": {[]byte("nnnn")},
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}
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var template_characters = map[byte]string{
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'V': "AEIOU",
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'C': "BCDFGHJKLMNPQRSTVWXYZ",
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'v': "aeiou",
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'c': "bcdfghjklmnpqrstvwxyz",
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'A': "AEIOUBCDFGHJKLMNPQRSTVWXYZ",
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'a': "AEIOUaeiouBCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz",
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'n': "0123456789",
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'o': "@&%?,=[]_:-+*$#!'^~;()/.",
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'x': "AEIOUaeiouBCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz0123456789!@#$%^&*()",
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}
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func derivePassword(counter uint32, password_type, password, user, site string) string {
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var templates = password_type_templates[password_type]
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if templates == nil {
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return fmt.Sprintf("cannot find password template %s", password_type)
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}
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var buffer bytes.Buffer
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buffer.WriteString(master_password_seed)
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binary.Write(&buffer, binary.BigEndian, uint32(len(user)))
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buffer.WriteString(user)
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salt := buffer.Bytes()
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key, err := scrypt.Key([]byte(password), salt, 32768, 8, 2, 64)
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if err != nil {
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return fmt.Sprintf("failed to derive password: %s", err)
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}
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buffer.Truncate(len(master_password_seed))
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binary.Write(&buffer, binary.BigEndian, uint32(len(site)))
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buffer.WriteString(site)
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binary.Write(&buffer, binary.BigEndian, counter)
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var hmacv = hmac.New(sha256.New, key)
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hmacv.Write(buffer.Bytes())
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var seed = hmacv.Sum(nil)
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var temp = templates[int(seed[0])%len(templates)]
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buffer.Truncate(0)
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for i, element := range temp {
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pass_chars := template_characters[element]
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pass_char := pass_chars[int(seed[i+1])%len(pass_chars)]
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buffer.WriteByte(pass_char)
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}
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return buffer.String()
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}
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func generatePrivateKey(typ string) string {
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var priv interface{}
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var err error
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switch typ {
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case "", "rsa":
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// good enough for government work
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priv, err = rsa.GenerateKey(rand.Reader, 4096)
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case "dsa":
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key := new(dsa.PrivateKey)
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// again, good enough for government work
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if err = dsa.GenerateParameters(&key.Parameters, rand.Reader, dsa.L2048N256); err != nil {
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return fmt.Sprintf("failed to generate dsa params: %s", err)
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}
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err = dsa.GenerateKey(key, rand.Reader)
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priv = key
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case "ecdsa":
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// again, good enough for government work
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priv, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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default:
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return "Unknown type " + typ
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}
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if err != nil {
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return fmt.Sprintf("failed to generate private key: %s", err)
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}
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return string(pem.EncodeToMemory(pemBlockForKey(priv)))
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}
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type DSAKeyFormat struct {
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Version int
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P, Q, G, Y, X *big.Int
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}
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func pemBlockForKey(priv interface{}) *pem.Block {
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switch k := priv.(type) {
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case *rsa.PrivateKey:
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return &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)}
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case *dsa.PrivateKey:
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val := DSAKeyFormat{
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P: k.P, Q: k.Q, G: k.G,
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Y: k.Y, X: k.X,
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}
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bytes, _ := asn1.Marshal(val)
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return &pem.Block{Type: "DSA PRIVATE KEY", Bytes: bytes}
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case *ecdsa.PrivateKey:
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b, _ := x509.MarshalECPrivateKey(k)
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return &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}
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default:
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return nil
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}
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}
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type certificate struct {
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Cert string
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Key string
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}
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func buildCustomCertificate(b64cert string, b64key string) (certificate, error) {
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crt := certificate{}
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cert, err := base64.StdEncoding.DecodeString(b64cert)
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if err != nil {
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return crt, errors.New("unable to decode base64 certificate")
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}
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key, err := base64.StdEncoding.DecodeString(b64key)
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if err != nil {
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return crt, errors.New("unable to decode base64 private key")
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}
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decodedCert, _ := pem.Decode(cert)
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if decodedCert == nil {
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return crt, errors.New("unable to decode certificate")
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}
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_, err = x509.ParseCertificate(decodedCert.Bytes)
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if err != nil {
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return crt, fmt.Errorf(
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"error parsing certificate: decodedCert.Bytes: %s",
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err,
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)
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}
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decodedKey, _ := pem.Decode(key)
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if decodedKey == nil {
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return crt, errors.New("unable to decode key")
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}
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_, err = x509.ParsePKCS1PrivateKey(decodedKey.Bytes)
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if err != nil {
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return crt, fmt.Errorf(
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"error parsing prive key: decodedKey.Bytes: %s",
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err,
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)
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}
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crt.Cert = string(cert)
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crt.Key = string(key)
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return crt, nil
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}
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func generateCertificateAuthority(
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cn string,
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daysValid int,
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) (certificate, error) {
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ca := certificate{}
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template, err := getBaseCertTemplate(cn, nil, nil, daysValid)
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if err != nil {
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return ca, err
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}
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// Override KeyUsage and IsCA
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template.KeyUsage = x509.KeyUsageKeyEncipherment |
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x509.KeyUsageDigitalSignature |
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x509.KeyUsageCertSign
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template.IsCA = true
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priv, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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return ca, fmt.Errorf("error generating rsa key: %s", err)
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}
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ca.Cert, ca.Key, err = getCertAndKey(template, priv, template, priv)
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if err != nil {
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return ca, err
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}
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return ca, nil
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}
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func generateSelfSignedCertificate(
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cn string,
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ips []interface{},
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alternateDNS []interface{},
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daysValid int,
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) (certificate, error) {
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cert := certificate{}
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template, err := getBaseCertTemplate(cn, ips, alternateDNS, daysValid)
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if err != nil {
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return cert, err
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}
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priv, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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return cert, fmt.Errorf("error generating rsa key: %s", err)
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}
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cert.Cert, cert.Key, err = getCertAndKey(template, priv, template, priv)
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if err != nil {
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return cert, err
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}
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return cert, nil
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}
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func generateSignedCertificate(
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cn string,
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ips []interface{},
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alternateDNS []interface{},
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daysValid int,
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ca certificate,
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) (certificate, error) {
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cert := certificate{}
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decodedSignerCert, _ := pem.Decode([]byte(ca.Cert))
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if decodedSignerCert == nil {
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return cert, errors.New("unable to decode certificate")
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}
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signerCert, err := x509.ParseCertificate(decodedSignerCert.Bytes)
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if err != nil {
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return cert, fmt.Errorf(
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"error parsing certificate: decodedSignerCert.Bytes: %s",
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err,
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)
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}
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decodedSignerKey, _ := pem.Decode([]byte(ca.Key))
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if decodedSignerKey == nil {
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return cert, errors.New("unable to decode key")
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}
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signerKey, err := x509.ParsePKCS1PrivateKey(decodedSignerKey.Bytes)
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if err != nil {
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return cert, fmt.Errorf(
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"error parsing prive key: decodedSignerKey.Bytes: %s",
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err,
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)
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}
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template, err := getBaseCertTemplate(cn, ips, alternateDNS, daysValid)
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if err != nil {
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return cert, err
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}
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priv, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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return cert, fmt.Errorf("error generating rsa key: %s", err)
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}
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cert.Cert, cert.Key, err = getCertAndKey(
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template,
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priv,
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signerCert,
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signerKey,
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)
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if err != nil {
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return cert, err
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}
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return cert, nil
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}
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func getCertAndKey(
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template *x509.Certificate,
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signeeKey *rsa.PrivateKey,
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parent *x509.Certificate,
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signingKey *rsa.PrivateKey,
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) (string, string, error) {
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derBytes, err := x509.CreateCertificate(
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rand.Reader,
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template,
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parent,
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&signeeKey.PublicKey,
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signingKey,
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)
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if err != nil {
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return "", "", fmt.Errorf("error creating certificate: %s", err)
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}
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certBuffer := bytes.Buffer{}
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if err := pem.Encode(
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&certBuffer,
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&pem.Block{Type: "CERTIFICATE", Bytes: derBytes},
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); err != nil {
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return "", "", fmt.Errorf("error pem-encoding certificate: %s", err)
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}
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keyBuffer := bytes.Buffer{}
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if err := pem.Encode(
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&keyBuffer,
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&pem.Block{
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Type: "RSA PRIVATE KEY",
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Bytes: x509.MarshalPKCS1PrivateKey(signeeKey),
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},
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); err != nil {
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return "", "", fmt.Errorf("error pem-encoding key: %s", err)
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}
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return string(certBuffer.Bytes()), string(keyBuffer.Bytes()), nil
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}
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func getBaseCertTemplate(
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cn string,
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ips []interface{},
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alternateDNS []interface{},
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daysValid int,
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) (*x509.Certificate, error) {
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ipAddresses, err := getNetIPs(ips)
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if err != nil {
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return nil, err
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}
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dnsNames, err := getAlternateDNSStrs(alternateDNS)
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if err != nil {
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return nil, err
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}
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serialNumberUpperBound := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberUpperBound)
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if err != nil {
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return nil, err
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}
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return &x509.Certificate{
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SerialNumber: serialNumber,
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Subject: pkix.Name{
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CommonName: cn,
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},
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IPAddresses: ipAddresses,
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DNSNames: dnsNames,
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NotBefore: time.Now(),
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NotAfter: time.Now().Add(time.Hour * 24 * time.Duration(daysValid)),
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KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
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ExtKeyUsage: []x509.ExtKeyUsage{
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x509.ExtKeyUsageServerAuth,
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x509.ExtKeyUsageClientAuth,
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},
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BasicConstraintsValid: true,
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}, nil
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}
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func getNetIPs(ips []interface{}) ([]net.IP, error) {
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if ips == nil {
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return []net.IP{}, nil
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}
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var ipStr string
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var ok bool
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var netIP net.IP
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netIPs := make([]net.IP, len(ips))
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for i, ip := range ips {
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ipStr, ok = ip.(string)
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if !ok {
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return nil, fmt.Errorf("error parsing ip: %v is not a string", ip)
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}
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netIP = net.ParseIP(ipStr)
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if netIP == nil {
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return nil, fmt.Errorf("error parsing ip: %s", ipStr)
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}
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netIPs[i] = netIP
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}
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return netIPs, nil
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}
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func getAlternateDNSStrs(alternateDNS []interface{}) ([]string, error) {
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if alternateDNS == nil {
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return []string{}, nil
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}
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var dnsStr string
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var ok bool
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alternateDNSStrs := make([]string, len(alternateDNS))
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for i, dns := range alternateDNS {
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dnsStr, ok = dns.(string)
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if !ok {
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return nil, fmt.Errorf(
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"error processing alternate dns name: %v is not a string",
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dns,
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)
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}
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alternateDNSStrs[i] = dnsStr
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}
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return alternateDNSStrs, nil
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}
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func encryptAES(password string, plaintext string) (string, error) {
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if plaintext == "" {
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return "", nil
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}
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key := make([]byte, 32)
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copy(key, []byte(password))
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", err
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}
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content := []byte(plaintext)
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blockSize := block.BlockSize()
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padding := blockSize - len(content)%blockSize
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padtext := bytes.Repeat([]byte{byte(padding)}, padding)
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content = append(content, padtext...)
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ciphertext := make([]byte, aes.BlockSize+len(content))
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iv := ciphertext[:aes.BlockSize]
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if _, err := io.ReadFull(rand.Reader, iv); err != nil {
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return "", err
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}
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mode := cipher.NewCBCEncrypter(block, iv)
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mode.CryptBlocks(ciphertext[aes.BlockSize:], content)
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return base64.StdEncoding.EncodeToString(ciphertext), nil
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}
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func decryptAES(password string, crypt64 string) (string, error) {
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if crypt64 == "" {
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return "", nil
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}
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key := make([]byte, 32)
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copy(key, []byte(password))
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crypt, err := base64.StdEncoding.DecodeString(crypt64)
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if err != nil {
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return "", err
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", err
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}
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iv := crypt[:aes.BlockSize]
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crypt = crypt[aes.BlockSize:]
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decrypted := make([]byte, len(crypt))
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mode := cipher.NewCBCDecrypter(block, iv)
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mode.CryptBlocks(decrypted, crypt)
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return string(decrypted[:len(decrypted)-int(decrypted[len(decrypted)-1])]), nil
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}
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