Golang in Password Management: Obtaining and Storing Encryption Keys from Vault

Application of Golang in Password Management: Obtaining and Storing Encryption Keys from Vault

Introduction:
In modern software development, security is a crucial aspect. The secure storage and use of encryption keys is critical to password management. In this post, we will discuss how to obtain and store encryption keys using Golang and Vault.

What is Vault?
Vault is an open source tool developed by HashiCorp for securely storing and accessing secrets, passwords and sensitive data. Vault provides a range of features, including role-based access control, encrypted storage, secrets automation, audit logs, and more. By using Vault, we can centrally store sensitive data in a safe place and provide secure access to applications and services.

Use Vault to obtain the encryption key:
First, we need to install and configure Vault. You can refer to Vault's official documentation for operation. Once installed, we can use Golang to interact with Vault.

When using Vault in Golang, we can use Vault's API to obtain the encryption key. First, we need to import the vault package and other necessary libraries:

import (
    "fmt"
    "github.com/hashicorp/vault/api"
)

Next, we can write a function to get the encryption key:

func getEncryptionKey() (string, error) {
    config := &api.Config{
        Address: "http://localhost:8200", // 替换为Vault的地址
    }

    client, err := api.NewClient(config)
    if err != nil {
        return "", err
    }

    // 设置Vault的访问令牌
    client.SetToken("YOUR_VAULT_TOKEN")

    // 从Vault中获取加密密钥
    secret, err := client.Logical().Read("secret/data/encryption-key")
    if err != nil {
        return "", err
    }

    if secret != nil && secret.Data != nil {
        if key, ok := secret.Data["key"].(string); ok {
            return key, nil
        }
    }

    return "", fmt.Errorf("encryption key not found")
}

In the above code, we first create Create a Vault client and set the Vault address and access token. We then use the client.Logical().Read method to get the encryption key from the Vault. Finally, we extract the encryption key from Vault's response data and return it.

Use Vault to store encryption keys:
In addition to obtaining encryption keys from Vault, we can also use Vault to store encryption keys securely. Next, we will demonstrate how to use Golang to store encryption keys.

First, we need to write a function to store the encryption key into the Vault:

func storeEncryptionKey(key string) error {
    config := &api.Config{
        Address: "http://localhost:8200", // 替换为Vault的地址
    }

    client, err := api.NewClient(config)
    if err != nil {
        return err
    }

    // 设置Vault的访问令牌
    client.SetToken("YOUR_VAULT_TOKEN")

    // 将加密密钥存储到Vault中
    data := map[string]interface{}{
        "key": key,
    }

    _, err = client.Logical().Write("secret/data/encryption-key", data)
    if err != nil {
        return err
    }

    return nil
}

In the above code, we first create a Vault client and set up the Vault address and access token. We then use the client.Logical().Write method to store the encryption key into the Vault.

Usage:
Now that we have learned how to obtain and store encryption keys, we can use these functions in our applications to enhance the security of password management.

Here is an example that demonstrates how to use Vault's encryption keys to encrypt and decrypt passwords in Golang:

import (
    "encoding/base64"
    "fmt"
    "github.com/awnumar/memguard"
)

func encryptPassword(password string) (string, error) {
    key, err := getEncryptionKey()
    if err != nil {
        return "", err
    }

    guardedKey := memguard.NewBufferFromBytes([]byte(key))
    defer memguard.PurgeBuffer(guardedKey)

    ciphertext, err := aesEncrypt([]byte(password), guardedKey.Buffer())
    if err != nil {
        return "", err
    }

    encodedCiphertext := base64.StdEncoding.EncodeToString(ciphertext)

    return encodedCiphertext, nil
}

func decryptPassword(encodedCiphertext string) (string, error) {
    key, err := getEncryptionKey()
    if err != nil {
        return "", err
    }

    guardedKey := memguard.NewBufferFromBytes([]byte(key))
    defer memguard.PurgeBuffer(guardedKey)

    ciphertext, err := base64.StdEncoding.DecodeString(encodedCiphertext)
    if err != nil {
        return "", err
    }

    plaintext, err := aesDecrypt(ciphertext, guardedKey.Buffer())
    if err != nil {
        return "", err
    }

    return string(plaintext), nil
}

func main() {
    // 加密密码
    encryptedPassword, err := encryptPassword("mySecretPassword")
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println("Encrypted Password:", encryptedPassword)

    // 解密密码
    decryptedPassword, err := decryptPassword(encryptedPassword)
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println("Decrypted Password:", decryptedPassword)
}

In the above code, we first use The getEncryptionKey function obtains the encryption key from Vault. We then use that key to encrypt the password and then decrypt it. Finally, we print out the encrypted and decrypted password.

Conclusion:
In this article, we discussed how to obtain and store encryption keys using Golang and Vault. We use Vault's API to interact with Vault and demonstrate how to use Vault's encryption keys to encrypt and decrypt passwords in Golang. By using Vault properly, we can enhance the security of password management and protect sensitive data. I hope this article will help you understand the application of Golang in password management.

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