dex/Dockerfile

ARG BASE_IMAGE=alpine

FROM --platform=$BUILDPLATFORM tonistiigi/xx:1.9.0@sha256:c64defb9ed5a91eacb37f96ccc3d4cd72521c4bd18d5442905b95e2226b0e707 AS xx

FROM --platform=$BUILDPLATFORM golang:1.25.5-alpine3.22@sha256:3587db7cc96576822c606d119729370dbf581931c5f43ac6d3fa03ab4ed85a10 AS builder

COPY --from=xx / /

RUN apk add --update alpine-sdk ca-certificates openssl clang lld

ARG TARGETPLATFORM

RUN xx-apk --update add musl-dev gcc

# lld has issues building static binaries for ppc so prefer ld for it
RUN [ "$(xx-info arch)" != "ppc64le" ] || XX_CC_PREFER_LINKER=ld xx-clang --setup-target-triple

RUN xx-go --wrap

WORKDIR /usr/local/src/dex

ARG GOPROXY

ENV CGO_ENABLED=1

COPY go.mod go.sum ./
COPY api/v2/go.mod api/v2/go.sum ./api/v2/
RUN go mod download

COPY . .

# Propagate Dex version from build args to the build environment
ARG VERSION
RUN make release-binary

RUN xx-verify /go/bin/dex && xx-verify /go/bin/docker-entrypoint

FROM alpine:3.23.0@sha256:51183f2cfa6320055da30872f211093f9ff1d3cf06f39a0bdb212314c5dc7375 AS stager

RUN mkdir -p /var/dex
RUN mkdir -p /etc/dex
COPY config.docker.yaml /etc/dex/

FROM alpine:3.23.0@sha256:51183f2cfa6320055da30872f211093f9ff1d3cf06f39a0bdb212314c5dc7375 AS gomplate

ARG TARGETOS
ARG TARGETARCH
ARG TARGETVARIANT

ENV GOMPLATE_VERSION=v4.3.3

RUN wget -O /usr/local/bin/gomplate \
    "https://github.com/hairyhenderson/gomplate/releases/download/${GOMPLATE_VERSION}/gomplate_${TARGETOS:-linux}-${TARGETARCH:-amd64}${TARGETVARIANT}" \
    && chmod +x /usr/local/bin/gomplate

# For Dependabot to detect base image versions
FROM alpine:3.23.0@sha256:51183f2cfa6320055da30872f211093f9ff1d3cf06f39a0bdb212314c5dc7375 AS alpine
FROM gcr.io/distroless/static-debian12:nonroot@sha256:2b7c93f6d6648c11f0e80a48558c8f77885eb0445213b8e69a6a0d7c89fc6ae4 AS distroless

FROM $BASE_IMAGE

# Dex connectors, such as GitHub and Google logins require root certificates.
# Proper installations should manage those certificates, but it's a bad user
# experience when this doesn't work out of the box.
#
# See https://go.dev/src/crypto/x509/root_linux.go for Go root CA bundle locations.
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt

COPY --from=stager --chown=1001:1001 /var/dex /var/dex
COPY --from=stager --chown=1001:1001 /etc/dex /etc/dex

# Copy module files for CVE scanning / dependency analysis.
COPY --from=builder /usr/local/src/dex/go.mod /usr/local/src/dex/go.sum /usr/local/src/dex/
COPY --from=builder /usr/local/src/dex/api/v2/go.mod /usr/local/src/dex/api/v2/go.sum /usr/local/src/dex/api/v2/

COPY --from=builder /go/bin/dex /usr/local/bin/dex
COPY --from=builder /go/bin/docker-entrypoint /usr/local/bin/docker-entrypoint
COPY --from=builder /usr/local/src/dex/web /srv/dex/web

COPY --from=gomplate /usr/local/bin/gomplate /usr/local/bin/gomplate

USER 1001:1001

ENTRYPOINT ["/usr/local/bin/docker-entrypoint"]
CMD ["dex", "serve", "/etc/dex/config.docker.yaml"]