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kubeadmin_password.go
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kubeadmin_password.go
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package cluster
import (
"bufio"
"bytes"
"context"
"crypto/rand"
"encoding/base64"
"fmt"
"math/big"
"os"
"strings"
"github.com/crc-org/crc/v2/pkg/crc/constants"
"github.com/crc-org/crc/v2/pkg/crc/logging"
"github.com/crc-org/crc/v2/pkg/crc/oc"
"golang.org/x/crypto/bcrypt"
)
// GenerateKubeAdminUserPassword creates and put updated kubeadmin password to ~/.crc/machine/crc/kubeadmin-password
func GenerateKubeAdminUserPassword() error {
logging.Infof("Generating new password for the kubeadmin user")
kubeAdminPasswordFile := constants.GetKubeAdminPasswordPath()
kubeAdminPassword, err := GenerateRandomPasswordHash(23)
if err != nil {
return fmt.Errorf("Cannot generate the kubeadmin user password: %w", err)
}
return os.WriteFile(kubeAdminPasswordFile, []byte(kubeAdminPassword), 0600)
}
// UpdateKubeAdminUserPassword updates the htpasswd secret
func UpdateKubeAdminUserPassword(ctx context.Context, ocConfig oc.Config, newPassword string) error {
if newPassword != "" {
logging.Infof("Overriding password for kubeadmin user")
if err := os.WriteFile(constants.GetKubeAdminPasswordPath(), []byte(strings.TrimSpace(newPassword)), 0600); err != nil {
return err
}
}
kubeAdminPassword, err := GetKubeadminPassword()
if err != nil {
return fmt.Errorf("Cannot read the kubeadmin user password from file: %w", err)
}
credentials := map[string]string{
"developer": "developer",
"kubeadmin": kubeAdminPassword,
}
if err := WaitForOpenshiftResource(ctx, ocConfig, "secret"); err != nil {
return err
}
given, stderr, err := ocConfig.RunOcCommandPrivate("get", "secret", "htpass-secret", "-n", "openshift-config", "-o", `jsonpath="{.data.htpasswd}"`)
if err != nil {
return fmt.Errorf("%s:%v", stderr, err)
}
ok, externals, err := compareHtpasswd(given, credentials)
if err != nil {
return err
}
if ok {
return nil
}
logging.Infof("Changing the password for the kubeadmin user")
expected, err := getHtpasswd(credentials, externals)
if err != nil {
return err
}
cmdArgs := []string{"patch", "secret", "htpass-secret", "-p",
fmt.Sprintf(`'{"data":{"htpasswd":"%s"}}'`, expected),
"-n", "openshift-config", "--type", "merge"}
_, stderr, err = ocConfig.RunOcCommandPrivate(cmdArgs...)
if err != nil {
return fmt.Errorf("Failed to update kubeadmin password %v: %s", err, stderr)
}
return nil
}
func GetKubeadminPassword() (string, error) {
kubeAdminPasswordFile := constants.GetKubeAdminPasswordPath()
rawData, err := os.ReadFile(kubeAdminPasswordFile)
if err != nil {
return "", err
}
return strings.TrimSpace(string(rawData)), nil
}
// generateRandomPasswordHash generates a hash of a random ASCII password
// 5char-5char-5char-5char
// Copied from openshift/installer https://github.com/openshift/installer/blob/master/pkg/asset/password/password.go
func GenerateRandomPasswordHash(length int) (string, error) {
const (
lowerLetters = "abcdefghijkmnopqrstuvwxyz"
upperLetters = "ABCDEFGHIJKLMNPQRSTUVWXYZ"
digits = "23456789"
all = lowerLetters + upperLetters + digits
)
var password string
for i := 0; i < length; i++ {
n, err := rand.Int(rand.Reader, big.NewInt(int64(len(all))))
if err != nil {
return "", err
}
newchar := string(all[n.Int64()])
if password == "" {
password = newchar
}
if i < length-1 {
n, err = rand.Int(rand.Reader, big.NewInt(int64(len(password)+1)))
if err != nil {
return "", err
}
j := n.Int64()
password = password[0:j] + newchar + password[j:]
}
}
pw := []rune(password)
for _, replace := range []int{5, 11, 17} {
pw[replace] = '-'
}
return string(pw), nil
}
func hashBcrypt(password string) (hash string, err error) {
passwordBytes, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
if err != nil {
return
}
return string(passwordBytes), nil
}
func getHtpasswd(credentials map[string]string, externals []string) (string, error) {
var ret []string
ret = append(ret, externals...)
for username, password := range credentials {
hash, err := hashBcrypt(password)
if err != nil {
return "", err
}
ret = append(ret, fmt.Sprintf("%s:%s", username, hash))
}
return base64.StdEncoding.EncodeToString([]byte(strings.Join(ret, "\n"))), nil
}
// source https://github.com/openshift/oauth-server/blob/04985077512fec241a5170074bf767c23592d7e7/pkg/authenticator/password/htpasswd/htpasswd.go
func compareHtpasswd(given string, credentials map[string]string) (bool, []string, error) {
decoded, err := base64.StdEncoding.DecodeString(given)
if err != nil {
return false, nil, err
}
scanner := bufio.NewScanner(bytes.NewReader(decoded))
var externals []string
found := 0
for scanner.Scan() {
line := scanner.Text()
if len(line) == 0 {
continue
}
parts := strings.SplitN(line, ":", 2)
if len(parts) != 2 {
continue
}
username := parts[0]
password := parts[1]
if expectedPassword, ok := credentials[username]; ok {
ok, err := testBCryptPassword(expectedPassword, password)
if err != nil || !ok {
continue
}
found++
} else {
externals = append(externals, line)
}
}
if found != len(credentials) {
return false, externals, nil
}
return true, externals, nil
}
func testBCryptPassword(password, hash string) (bool, error) {
err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
if err == bcrypt.ErrMismatchedHashAndPassword {
return false, nil
}
if err != nil {
return false, err
}
return true, nil
}