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。但是当我在 Docker 中运行应用程序时，SendEmailAsync 会出现异常。

例外：

由于证书错误，远程证书无效 链：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

这里的问题似乎是一个不受信任的证书。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，我要做的是将证书或 CA 复制到您的基本/最终 docker 阶段的路径“/etc/ssl/certs/”。

例如在你的 docker 文件的第二行：

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

如果这是您的问题，前面的方法会告诉您。假设这是解决方案，我建议您不要直接复制 docker 文件中的证书。例如，在生产环境中，如果您使用 Kubernetes 或使用 docker-compose 和卷，您应该将其作为 Secret 来执行。

编辑： 获取您需要信任的证书并将其放在 Dockerfile 的同一路径上。 然后像下面这样编辑你的 dockerfile：

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"]