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136 lines
6.0 KiB
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136 lines
6.0 KiB
Markdown
[#]: collector: (lujun9972)
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[#]: translator: (geekpi)
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[#]: reviewer: (wxy)
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[#]: publisher: (wxy)
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[#]: url: (https://linux.cn/article-10921-1.html)
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[#]: subject: (Be your own certificate authority)
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[#]: via: (https://opensource.com/article/19/4/certificate-authority)
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[#]: author: (Moshe Zadka https://opensource.com/users/moshez/users/elenajon123)
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自己成为一个证书颁发机构（CA）
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======
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> 为你的微服务架构或者集成测试创建一个简单的内部 CA。
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传输层安全（[TLS][2]）模型（有时也称它的旧名称 SSL）基于<ruby>[证书颁发机构][3]<rt>certificate authoritie</rt></ruby>（CA）的概念。这些机构受到浏览器和操作系统的信任，从而*签名*服务器的的证书以用于验证其所有权。
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但是，对于内部网络，微服务架构或集成测试，有时候*本地 CA*更有用：一个只在内部受信任的 CA，然后签名本地服务器的证书。
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这对集成测试特别有意义。获取证书可能会带来负担，因为这会占用服务器几分钟。但是在代码中使用“忽略证书”可能会被引入到生产环境，从而导致安全灾难。
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CA 证书与常规服务器证书没有太大区别。重要的是它被本地代码信任。例如，在 Python `requests` 库中，可以通过将 `REQUESTS_CA_BUNDLE` 变量设置为包含此证书的目录来完成。
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在为集成测试创建证书的例子中，不需要*长期的*证书：如果你的集成测试需要超过一天，那么你应该已经测试失败了。
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因此，计算**昨天**和**明天**作为有效期间隔：
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```
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>>> import datetime
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>>> one_day = datetime.timedelta(days=1)
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>>> today = datetime.date.today()
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>>> yesterday = today - one_day
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>>> tomorrow = today - one_day
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```
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现在你已准备好创建一个简单的 CA 证书。你需要生成私钥，创建公钥，设置 CA 的“参数”，然后自签名证书：CA 证书*总是*自签名的。最后，导出证书文件以及私钥文件。
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```
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from cryptography.hazmat.primitives.asymmetric import rsa
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from cryptography.hazmat.primitives import hashes, serialization
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from cryptography import x509
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from cryptography.x509.oid import NameOID
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private_key = rsa.generate_private_key(
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public_exponent=65537,
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key_size=2048,
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backend=default_backend()
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)
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public_key = private_key.public_key()
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builder = x509.CertificateBuilder()
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builder = builder.subject_name(x509.Name([
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x509.NameAttribute(NameOID.COMMON_NAME, 'Simple Test CA'),
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]))
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builder = builder.issuer_name(x509.Name([
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x509.NameAttribute(NameOID.COMMON_NAME, 'Simple Test CA'),
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]))
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builder = builder.not_valid_before(yesterday)
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builder = builder.not_valid_after(tomorrow)
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builder = builder.serial_number(x509.random_serial_number())
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builder = builder.public_key(public_key)
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builder = builder.add_extension(
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x509.BasicConstraints(ca=True, path_length=None),
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critical=True)
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certificate = builder.sign(
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private_key=private_key, algorithm=hashes.SHA256(),
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backend=default_backend()
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)
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private_bytes = private_key.private_bytes(
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encoding=serialization.Encoding.PEM,
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format=serialization.PrivateFormat.TraditionalOpenSSL,
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encryption_algorithm=serialization.NoEncrption())
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public_bytes = certificate.public_bytes(
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encoding=serialization.Encoding.PEM)
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with open("ca.pem", "wb") as fout:
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fout.write(private_bytes + public_bytes)
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with open("ca.crt", "wb") as fout:
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fout.write(public_bytes)
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```
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通常，真正的 CA 会需要[证书签名请求][4]（CSR）来签名证书。但是，当你是自己的 CA 时，你可以制定自己的规则！可以径直签名你想要的内容。
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继续集成测试的例子，你可以创建私钥并立即签名相应的公钥。注意 `COMMON_NAME` 需要是 `https` URL 中的“服务器名称”。如果你已配置名称查询，你需要服务器能响应对 `service.test.local` 的请求。
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```
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service_private_key = rsa.generate_private_key(
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public_exponent=65537,
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key_size=2048,
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backend=default_backend()
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)
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service_public_key = service_private_key.public_key()
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builder = x509.CertificateBuilder()
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builder = builder.subject_name(x509.Name([
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x509.NameAttribute(NameOID.COMMON_NAME, 'service.test.local')
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]))
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builder = builder.not_valid_before(yesterday)
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builder = builder.not_valid_after(tomorrow)
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builder = builder.public_key(public_key)
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certificate = builder.sign(
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private_key=private_key, algorithm=hashes.SHA256(),
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backend=default_backend()
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)
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private_bytes = service_private_key.private_bytes(
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encoding=serialization.Encoding.PEM,
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format=serialization.PrivateFormat.TraditionalOpenSSL,
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encryption_algorithm=serialization.NoEncrption())
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public_bytes = certificate.public_bytes(
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encoding=serialization.Encoding.PEM)
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with open("service.pem", "wb") as fout:
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fout.write(private_bytes + public_bytes)
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```
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现在 `service.pem` 文件有一个私钥和一个“有效”的证书：它已由本地的 CA 签名。该文件的格式可以给 Nginx、HAProxy 或大多数其他 HTTPS 服务器使用。
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通过将此逻辑用在测试脚本中，只要客户端配置信任该 CA，那么就可以轻松创建看起来真实的 HTTPS 服务器。
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/19/4/certificate-authority
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作者：[Moshe Zadka][a]
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选题：[lujun9972][b]
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译者：[geekpi](https://github.com/geekpi)
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校对：[wxy](https://github.com/wxy)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://opensource.com/users/moshez/users/elenajon123
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[b]: https://github.com/lujun9972
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[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/rh_commun_4604_02_mech_connections_rhcz0.5x.png?itok=YPPU4dMj
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[2]: https://en.wikipedia.org/wiki/Transport_Layer_Security
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[3]: https://en.wikipedia.org/wiki/Certificate_authority
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[4]: https://en.wikipedia.org/wiki/Certificate_signing_request
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