如何在 docker 映像中添加 CA 根证书？

我在 Ubuntu 14.04的 Docker 1.13.1容器中运行 ASP.NET Core 1.1 Web API。

当代码试图从 HTTPS 服务器检索某些数据时，我会得到这个证书身份验证错误:

 An error occurred while sending the request. ---> System.Net.Http.CurlException: Peer certificate cannot be authenticated with given CA certificates
at System.Net.Http.CurlHandler.ThrowIfCURLEError(CURLcode error)
at System.Net.Http.CurlHandler.MultiAgent.FinishRequest(StrongToWeakReference`1 easyWrapper, CURLcode messageResult)

HTTPS 服务器是由我们公司 CA 签署的内部证书，所以我知道我可能需要注册内部 CA。

到目前为止，我发现的所有关于这个错误和 Docker 谈到让 Docker 本身运行，连接到回购等。我的 Docker 工作正常，而且 Web API 在容器外的 Ubuntu 服务器上运行没有问题。

1)我是否需要在 docker 映像内加入 CA 根证书？

2)如果有，我该怎么做？

3)如果没有，我怎么解决这个问题？

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最佳答案

The task itself is not specific to docker as you would need to add that CA on a normal system too. There is an answer on the askubuntu community on how to do this.

So in a Dockerfile you would do the following (don't forget chmod in case you're running the container with a user other than root):

ADD your_ca_root.crt /usr/local/share/ca-certificates/foo.crt
RUN chmod 644 /usr/local/share/ca-certificates/foo.crt && update-ca-certificates
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It's also worth noting that this definitely needs to use the .crt extension. I initially tried this with a .pem cert file (I thought they were interchangeable, so others might also), which is not linked by update-ca-certificates.

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Installing ca-certificates locate cert_file_name.crt file in the same directory as Dockerfile.

# Install ca-certificates
# Please locate cert_file_name.crt file in the same directory as Dockerfile.
COPY cert_file_name.crt /usr/share/ca-certificates/
RUN echo cert_file_name.crt >> /etc/ca-certificates.conf
RUN update-ca-certificates

This will update certificates in the Dockerfile.

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To simplify/standardise all container builds, we now host our certificates on a central HTTPS server and build them into our containers like this:

# Debian stretch based container
RUN curl -ks 'https://cert.host.server/ssl_certs/EnterpriseRootCA.crt' -o '/usr/local/share/ca-certificates/EnterpriseRootCA.crt'
RUN /usr/sbin/update-ca-certificates

Alpine-based containers don't have the tools immediately available so require a bit more work to achieve the same:

# Alpine based containers
RUN apk update && apk add curl
WORKDIR /usr/local/share/ca-certificates
RUN curl -ks 'https://cert.host.server/ssl_certs/EnterpriseRootCA.crt' -o '/usr/local/share/ca-certificates/EnterpriseRootCA.crt'
RUN /usr/sbin/update-ca-certificates

If you also want to update your Java truststore (same as on any computer):

RUN keytool -keystore /usr/lib/jvm/java-8-oracle/jre/lib/security/cacerts -storepass changeit -noprompt -trustcacerts -importcert -alias EnterpriseRootCA -file EnterpriseRootCA.crt
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Another option is to use OpenSSL. Replace domain_name with the URL you can retrieve the CA

RUN openssl s_client -connect <domain_name>:443 -showcerts </dev/null 2>/dev/null | sed -e '/-----BEGIN/,/-----END/!d' | tee "/usr/local/share/ca-certificates/ca.crt" >/dev/null && \
update-ca-certificates

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