由于证书链中的错误，远程证书无效：UntrustedRoot with SendGrid in Docker

Question

我正在使用 SendGrid 发送电子邮件 .net5 windows 服务，当我从 Visual Studio 本地运行应用程序时，它按预期工作。SendEmailAsync但当我在 Docker 中运行应用程序时，它给出了一个例外。

例外：

由于证书链中的错误，远程证书无效：UntrustedRoot

List<Personalization> personalizations = new List<Personalization>();
Personalization personalization = new Personalization();

personalization.From = new EmailAddress(emailDetails.SenderMailID);
personalization.Tos = GetRecipientsList(emailDetails.RecipientMailID);
personalization.Subject = emailDetails.Subject;
personalizations.Add(personalization);
var msg = new SendGridMessage
{
    From = new EmailAddress(emailDetails.SenderMailID),
    Subject = emailDetails.Subject
};
msg.AddContent(MimeType.Html, emailDetails.Message);
msg.Personalizations = personalizations;
var sendGridClient = new SendGridClient(apiKey);
var sendGridResponse = await sendGridClient.SendEmailAsync(msg);

Docker 文件：

#See https://aka.ms/containerfastmode to understand how Visual Studio uses this Dockerfile to build your images for faster debugging.

FROM mcr.microsoft.com/dotnet/runtime:5.0 AS base
WORKDIR /app

FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build
WORKDIR /src
COPY ["src/service/MyWindowsService/MyWindowsService.csproj", "src/service/MyWindowsService/"]
RUN dotnet restore "src/service/MyWindowsService/MyWindowsService.csproj"
COPY . .
WORKDIR "/src/src/service/MyWindowsService"
RUN dotnet build "MyWindowsService.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "MyWindowsService.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "MyWindowsService.dll"]

Answer 1

看来这里的问题是不受信任的证书。例如，当证书是自签名的或使用非公共 CA 根时，可能会发生这种情况。

在这种情况下，您可以将证书或 CA 复制到基本/最终 docker 阶段的指定路径“/etc/ssl/certs/”。

例如，在 docker 文件的第二行中：

复制 ./server-certificate.pem /etc/ssl/certs/server-certificate.pem

前面的方法将告诉您这是否是您的问题。假设这是解决方案，我建议您不要直接将证书复制到 docker 文件中。例如，在生产环境中，如果您使用 Kubernetes 或 docker-compose 卷，则应将其作为 Secret 执行。

编辑：要获取证书，您需要信任并将其放在与 Dockerfile 相同的路径上。然后编辑你的 dockerfile，如下所示：

FROM mcr.microsoft.com/dotnet/runtime:5.0 AS base
COPY ./server-certificate.pem /etc/ssl/certs/server-certificate.pem
WORKDIR /app

FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build
WORKDIR /src
COPY ["src/service/MyWindowsService/MyWindowsService.csproj", "src/service/MyWindowsService/"]
RUN dotnet restore "src/service/MyWindowsService/MyWindowsService.csproj"
COPY . .
WORKDIR "/src/src/service/MyWindowsService"
RUN dotnet build "MyWindowsService.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "MyWindowsService.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "MyWindowsService.dll"]