[BUG] tls: failed to verify certificate: x509: certificate signed by unknown authority

[ricardogama]

While building a Docker image based on ubuntu:jammy, the request to register the metered key fails with a TLS error:

url.Error=Post \"https://cloud.unidoc.io/api/metered/status\": tls: failed to verify certificate: x509: certificate signed by unknown authority)"

The Dockerfile is pretty simple, installing CA certificates via apt install ca-certificates:

FROM ubuntu:jammy AS base

RUN apt update \
    && apt install -y --no-install-recommends \
    ca-certificates

Since the code is obfuscated it's very hard to debug the issue, any help is pretty welcome :)

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[sampila]

Hi @ricardogama,

Do you build the unipdf inside the docker? probably can help us to replicate this issue or share the Dockerfile?

Best regards

[ricardogama]

@sampila Sure, this will illustrate the problem:

main.go

package main

import (
    "fmt"
    "os"

    "github.com/unidoc/unipdf/v3/common/license"
)

func main() {
    if err := license.SetMeteredKey(os.Getenv("UNIDOC_KEY")); err != nil {
        panic(err)
    }

    fmt.Println("ok")
}

Dockerfile

FROM golang:1.21.1

WORKDIR /src

RUN apt update \
    && apt install -y --no-install-recommends \
    ca-certificates

ADD . /src

RUN go build main.go

ENV UNIDOC_KEY foobar

CMD ["/src/main"]

Build the image:

▶ docker build --progress=plain -t builder .

Run the image:

▶ docker run builder
panic: Post "https://cloud.unidoc.io/api/metered/status": tls: failed to verify certificate: x509: certificate signed by unknown authority

goroutine 1 [running]:
main.main()
    /src/main.go:12 +0x84

[sampila]

Thanks, we will check this issue

[sampila]

Hi @ricardogama,

We tried to build several times, but couldn't reproduce the issue, here's what we got

docker run builder                        
{OK:true Credits:110 Used:11}
ok

The Dockerfile

FROM golang:1.21.1

WORKDIR /src

RUN apt update \
    && apt install -y --no-install-recommends \
    ca-certificates

ADD . /src

RUN go build main.go

ENV UNIDOC_KEY "you_api_key"

CMD ["/src/main"]

Our main.go

package main

import (
    "fmt"
    "os"

    "github.com/unidoc/unipdf/v3/common/license"
)

func main() {
    if err := license.SetMeteredKey(os.Getenv("UNIDOC_KEY")); err != nil {
        panic(err)
    }

    state, err := license.GetMeteredState()
    if err != nil {
        panic(err)
    }

    fmt.Printf("%+v\n", state)
    fmt.Println("ok")
}

[sampila]

Looks like the issue is because the ca-certificates not being added into docker image.

[ricardogama]

Strange you couldn't reproduce with the exact same Dockerfile, but I found a fix in the meanwhile.

The workaround is to manually add the certificate to the image, something like this:

FROM golang:1.21.1

WORKDIR /src

RUN apt update \
    && apt install -y --no-install-recommends \
    ca-certificates openssl

RUN openssl s_client -showcerts -connect cloud.unidoc.io:443 </dev/null 2>/dev/null | openssl x509 -outform PEM > unidoc.pem \
    && cp unidoc.pem /usr/local/share/ca-certificates/unidoc.crt \
    && update-ca-certificates --fresh

ADD . /src

RUN go build main.go

ENV UNIDOC_KEY foobar

CMD ["/src/main"]

Maybe it will help someone in the future, thanks for your time!

[sampila]

Hi @ricardogama, yes pretty strang.

Thank you for the solution that you are providing.