/usr/share/gocode/src/github.com/ctdk/goiardi/chefcrypto/chefcrypto.go is in golang-github-ctdk-goiardi-dev 0.11.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 | /* Various cryptographic functions, as needed. */
/*
* Copyright (c) 2013-2016, Jeremy Bingham (<jeremy@goiardi.gl>)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// Package chefcrypto bundles up crytographic routines for goairdi.
// DEPRECATED: This library has been moved to github.com/ctdk/chefcrypto, and
// will be removed from goiardi with a later release.
package chefcrypto
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"crypto/sha512"
"crypto/x509"
"encoding/base64"
"encoding/hex"
"encoding/pem"
"fmt"
"math/big"
"strings"
)
// GenerateRSAKeys creates a pair of private and public keys for a client.
func GenerateRSAKeys() (string, string, error) {
/* Shamelessly borrowed and adapted from some golang-samples */
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return "", "", err
}
if err := priv.Validate(); err != nil {
errStr := fmt.Errorf("RSA key validation failed: %s", err)
return "", "", errStr
}
privDer := x509.MarshalPKCS1PrivateKey(priv)
/* For some reason chef doesn't label the keys RSA PRIVATE/PUBLIC KEY */
privBlk := pem.Block{
Type: "RSA PRIVATE KEY",
Headers: nil,
Bytes: privDer,
}
privPem := string(pem.EncodeToMemory(&privBlk))
pub := priv.PublicKey
pubDer, err := x509.MarshalPKIXPublicKey(&pub)
if err != nil {
errStr := fmt.Errorf("Failed to get der format for public key: %s", err)
return "", "", errStr
}
pubBlk := pem.Block{
Type: "PUBLIC KEY",
Headers: nil,
Bytes: pubDer,
}
pubPem := string(pem.EncodeToMemory(&pubBlk))
return privPem, pubPem, nil
}
// ValidatePublicKey checks that the provided public key is valid.
func ValidatePublicKey(publicKey interface{}) (bool, error) {
switch publicKey := publicKey.(type) {
case string:
// at the moment we don't care about the pub interface
decPubKey, z := pem.Decode([]byte(publicKey))
if decPubKey == nil {
err := fmt.Errorf("Public key does not validate: %s", z)
return false, err
}
// Add the header to PKCS#1 public keys
if strings.HasPrefix(publicKey, "-----BEGIN RSA PUBLIC KEY-----") && len(decPubKey.Bytes) == 270 {
pkcs8head := []byte{0x30, 0x82, 0x01, 0x22, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x82, 0x01, 0x0f, 0x00}
pkcs8head = append(pkcs8head, decPubKey.Bytes...)
decPubKey.Bytes = pkcs8head
}
if _, err := x509.ParsePKIXPublicKey(decPubKey.Bytes); err != nil {
nerr := fmt.Errorf("Public key did not validate: %s", err.Error())
return false, nerr
}
return true, nil
default:
err := fmt.Errorf("Public key does not validate")
return false, err
}
}
// HeaderDecrypt decrypts the encrypted header with the client or user's public
// key for validating requests. This function is informed by chef-golang's
// privateDecrypt function.
func HeaderDecrypt(pkPem string, data string) ([]byte, error) {
block, _ := pem.Decode([]byte(pkPem))
if block == nil {
return nil, fmt.Errorf("Invalid block size for '%s'", pkPem)
}
pubKey, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return nil, err
}
decData, perr := base64.StdEncoding.DecodeString(data)
if perr != nil {
return nil, perr
}
dec, derr := decrypt(pubKey.(*rsa.PublicKey), decData)
if derr != nil {
return nil, derr
}
/* skip past the 0xff padding added to the header before encrypting. */
skip := 0
for i := 2; i < len(dec); i++ {
if i+1 >= len(dec) {
break
}
if dec[i] == 0xff && dec[i+1] == 0 {
skip = i + 2
break
}
}
return dec[skip:], nil
}
// Auth12HeaderVerify verifies the newer version 1.2 Chef authentication protocol
// headers.
func Auth12HeaderVerify(pkPem string, hashed, sig []byte) error {
block, _ := pem.Decode([]byte(pkPem))
if block == nil {
return fmt.Errorf("Invalid block size for '%s'", pkPem)
}
pubKey, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return err
}
return rsa.VerifyPKCS1v15(pubKey.(*rsa.PublicKey), crypto.SHA1, hashed, sig)
}
// SignTextBlock signs a block of text using the provided private RSA key. Used
// by shovey to sign requests that the client can verify.
func SignTextBlock(textBlock string, privKey *rsa.PrivateKey) (string, error) {
if textBlock == "" {
err := fmt.Errorf("no text to sign provided")
return "", err
}
tbSha := sha1.Sum([]byte(textBlock))
signed, err := rsa.SignPKCS1v15(rand.Reader, privKey, crypto.SHA1, tbSha[:])
return base64.StdEncoding.EncodeToString(signed), err
}
// There has been discussion of renaming this and submitting it along with its
// counterpart in chef-golang to crypto/rsa.
func decrypt(pubKey *rsa.PublicKey, data []byte) ([]byte, error) {
c := new(big.Int)
m := new(big.Int)
m.SetBytes(data)
e := big.NewInt(int64(pubKey.E))
c.Exp(m, e, pubKey.N)
out := c.Bytes()
return out, nil
}
// HashPasswd SHA512 hashes a password string with the provided salt.
func HashPasswd(passwd string, salt []byte) (string, error) {
if passwd == "" {
err := fmt.Errorf("Password is empty")
return "", err
}
hashPwByte := sha512.Sum512(append(salt, []byte(passwd)...))
hashPw := hex.EncodeToString(hashPwByte[:])
return hashPw, nil
}
// GenerateSalt makes a new salt for hashing a password.
func GenerateSalt() ([]byte, error) {
numbytes := 64
b := make([]byte, numbytes)
_, err := rand.Read(b)
if err != nil {
return nil, err
}
return b, nil
}
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