The author primary signature's timestamp found a chain building issue: UntrustedRoot: self signed certificate in certificate chain

Question

While doing a docker build on my .NET Core project, I got the following error on all my NuGets:

80.19 /app/GradingTool.Tests/GradingTool.Tests.csproj : error NU3028: Package 'Microsoft.EntityFrameworkCore 5.0.0' from source 'https://api.nuget.org/v3/index.json': The author primary signature's timestamp found a chain building issue: UntrustedRoot: self signed certificate in certificate chain [/app/GradingTool.sln]

#12 80.20 /app/GradingTool.Tests/GradingTool.Tests.csproj : error NU3037: Package 'Microsoft.EntityFrameworkCore 5.0.0' from source 'https://api.nuget.org/v3/index.json': The author primary signature validity period has expired. [/app/GradingTool.sln]

#12 80.20 /app/GradingTool.Tests/GradingTool.Tests.csproj : error NU3028: Package 'Microsoft.EntityFrameworkCore 5.0.0' from source 'https://api.nuget.org/v3/index.json': The repository countersignature's timestamp found a chain building issue: UntrustedRoot: self signed certificate in certificate chain [/app/GradingTool.sln]

I never had this error before, Can someone help me figure out what the problem is?

Dockerfile:

FROM mcr.microsoft.com/dotnet/sdk:latest AS build-env
WORKDIR /app
RUN apt-get update -yq \
    && apt-get install curl gnupg -yq \
    && curl -sL https://deb.nodesource.com/setup_10.x | bash \
    && apt-get install nodejs -yq
# Copy csproj and restore as distinct layers
COPY . ./
RUN dotnet restore
RUN dotnet publish -c Release -o out

# Build runtime image
FROM mcr.microsoft.com/dotnet/aspnet:latest
RUN apt-get update \
    && apt-get install -y --no-install-recommends libgdiplus libc6-dev \
    && apt-get clean \
    && rm -rf /var/lib/apt/lists/*
WORKDIR /app
COPY --from=build-env /app/out .
ENV ASPNETCORE_URLS="http://+:4200"
ENV ASPNETCORE_ENVIRONMENT="Production"
ENV GOOGLE_APPLICATION_CREDENTIALS="Credentials/SchoolTools-e9f260bdf56e.json"
ENV VIRTUAL_HOST="eva.schooltools.lu,www.eva.schooltools.lu,schooltools.lu,www.schooltools.lu"
ENV LETSENCRYPT_HOST="eva.schooltools.lu,www.eva.schooltools.lu,schooltools.lu,www.schooltools.lu"
ENV LETSENCRYPT_EMAIL="[email protected]"
EXPOSE 4200
ENTRYPOINT ["dotnet", "GradingTool.dll"]

Answer 1

Update: Check this announcement: https://github.com/NuGet/Announcements/issues/49

At the moment the issue appears to be related to the Debian image.

Switch to an Ubuntu or Alpine based image instead:

FROM mcr.microsoft.com/dotnet/sdk:5.0-focal AS build-env

Follow https://github.com/NuGet/Home/issues/10491 for updates.

Answer 2

In the Dockerfile file, I changed from

FROM mcr.microsoft.com/dotnet/aspnet:5.0-buster-slim

to

FROM mcr.microsoft.com/dotnet/sdk:5.0-alpine

This worked for me!