云原生安全之镜像安全编译cosign

最开始源于对cosign二开需求，将此集成到产品中，有了以下几个问题1.一个admission controller使用几个组件能够完成交互1.1 development1.2 service1.3 admission controller2.helm安装的cosigned是如何安装的，其依赖哪些组件3.前置知识1.下载https://github.com/sigstore/cosign2.安装g

信安成长日记

379人浏览 · 2022-06-01 12:29:08

信安成长日记 · 2022-06-01 12:29:08 发布

最开始源于对cosign二开需求，将此集成到产品中，有了以下几个问题

1.一个admission controller使用几个组件能够完成交互

1.1 development用于部署pod

1.2 service用于暴露服务端口

1.3 admission controller用于注册admission controller拦截请求

2.helm安装的cosigned是如何安装的，其依赖哪些组件

前置知识

1.下载

git clone https://github.com/sigstore/cosigns

后期的ko组件打包成镜像并且推送到dockerhub需要使用.git文件

2.安装golang

sudo add-apt-repository ppa:longsleep/golang-backports
sudo apt update
sudo apt install golang-go

3.安装make

apt-get update

apt-get install make

4.安装ko

go install github.com/google/ko@latest
cd /root/go
cp ko /bin

5.安装Kustomize

curl -s "https://raw.githubusercontent.com/kubernetes-sigs/kustomize/master/hack/install_kustomize.sh"  | bash

编译

这里需要稍微学习一下makefile。

我们需要修改两个位置

1.设置仓库

2.仅编译linux/amd64 ，既设置COSIGNED_ARCHS?=linux/amd64

make policy-controller ko-policy-controller

#
# Copyright 2021 The Sigstore Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Get the currently used golang install path (in GOPATH/bin, unless GOBIN is set)
ifeq (,$(shell go env GOBIN))
GOBIN=$(shell go env GOPATH)/bin
else
GOBIN=$(shell go env GOBIN)
endif

GOFILES ?= $(shell find . -type f -name '*.go' -not -path "./vendor/*")

# Set version variables for LDFLAGS
PROJECT_ID ?= projectsigstore
RUNTIME_IMAGE ?= gcr.io/distroless/static
GIT_TAG ?= dirty-tag
GIT_VERSION ?= $(shell git describe --tags --always --dirty)
GIT_HASH ?= $(shell git rev-parse HEAD)
DATE_FMT = +%Y-%m-%dT%H:%M:%SZ
SOURCE_DATE_EPOCH ?= $(shell git log -1 --pretty=%ct)
ifdef SOURCE_DATE_EPOCH
    BUILD_DATE ?= $(shell date -u -d "@$(SOURCE_DATE_EPOCH)" "$(DATE_FMT)" 2>/dev/null || date -u -r "$(SOURCE_DATE_EPOCH)" "$(DATE_FMT)" 2>/dev/null || date -u "$(DATE_FMT)")
else
    BUILD_DATE ?= $(shell date "$(DATE_FMT)")
endif
GIT_TREESTATE = "clean"
DIFF = $(shell git diff --quiet >/dev/null 2>&1; if [ $$? -eq 1 ]; then echo "1"; fi)
ifeq ($(DIFF), 1)
    GIT_TREESTATE = "dirty"
endif
PLATFORMS=darwin linux windows
ARCHITECTURES=amd64
COSIGNED_ARCHS?=all

LDFLAGS=-buildid= -X sigs.k8s.io/release-utils/version.gitVersion=$(GIT_VERSION) \
        -X sigs.k8s.io/release-utils/version.gitCommit=$(GIT_HASH) \
        -X sigs.k8s.io/release-utils/version.gitTreeState=$(GIT_TREESTATE) \
        -X sigs.k8s.io/release-utils/version.buildDate=$(BUILD_DATE)

SRCS = $(shell find cmd -iname "*.go") $(shell find pkg -iname "*.go")

GOLANGCI_LINT_DIR = $(shell pwd)/bin
GOLANGCI_LINT_BIN = $(GOLANGCI_LINT_DIR)/golangci-lint

KO_PREFIX ?= gcr.io/projectsigstore
export KO_DOCKER_REPO=$(KO_PREFIX)
GHCR_PREFIX ?= ghcr.io/sigstore/cosign
COSIGNED_YAML ?= cosign-$(GIT_TAG).yaml
LATEST_TAG ?=

.PHONY: all lint test clean cosign cross
all: cosign

log-%:
	@grep -h -E '^$*:.*?## .*$$' $(MAKEFILE_LIST) | \
		awk \
			'BEGIN { \
				FS = ":.*?## " \
			}; \
			{ \
				printf "\033[36m==> %s\033[0m\n", $$2 \
			}'

.PHONY: checkfmt
checkfmt: SHELL := /usr/bin/env bash
checkfmt: ## Check formatting of all go files
	@ $(MAKE) --no-print-directory log-$@
 	$(shell test -z "$(shell gofmt -l $(GOFILES) | tee /dev/stderr)")
 	$(shell test -z "$(shell goimports -l $(GOFILES) | tee /dev/stderr)")

.PHONY: fmt
fmt: ## Format all go files
	@ $(MAKE) --no-print-directory log-$@
	goimports -w $(GOFILES)

cosign: $(SRCS)
	go env -w GOPROXY=https://goproxy.cn
	CGO_ENABLED=0 go build -trimpath -ldflags "$(LDFLAGS)" -o $@ ./cmd/cosign

cosign-pivkey-pkcs11key: $(SRCS)
	go env -w GOPROXY=https://goproxy.cn
	CGO_ENABLED=1 go build -trimpath -tags=pivkey,pkcs11key -ldflags "$(LDFLAGS)" -o cosign ./cmd/cosign

## Build cosigned binary
.PHONY: cosigned
cosigned: policy-webhook
	go env -w GOPROXY=https://goproxy.cn
	CGO_ENABLED=0 go build -trimpath -ldflags "$(LDFLAGS)" -o $@ ./cmd/cosign/webhook

.PHONY: policy-webhook
policy-webhook: ## Build the policy webhook binary
	go env -w GOPROXY=https://goproxy.cn
	CGO_ENABLED=0 go build -trimpath -ldflags "$(LDFLAGS)" -o $@ ./cmd/cosign/policy_webhook

.PHONY: sget
sget: ## Build sget binary
	go env -w GOPROXY=https://goproxy.cn
	go build -trimpath -ldflags "$(LDFLAGS)" -o $@ ./cmd/sget

.PHONY: cross
cross:
	$(foreach GOOS, $(PLATFORMS),\
		$(foreach GOARCH, $(ARCHITECTURES), $(shell export GOOS=$(GOOS); export GOARCH=$(GOARCH); \
	go build -trimpath -ldflags "$(LDFLAGS)" -o cosign-$(GOOS)-$(GOARCH) ./cmd/cosign; \
	shasum -a 256 cosign-$(GOOS)-$(GOARCH) > cosign-$(GOOS)-$(GOARCH).sha256 ))) \

#####################
# lint / test section
#####################

golangci-lint:
	rm -f $(GOLANGCI_LINT_BIN) || :
	set -e ;\
	GOBIN=$(GOLANGCI_LINT_DIR) go install github.com/golangci/golangci-lint/cmd/golangci-lint@v1.43.0 ;\

lint: golangci-lint ## Run golangci-lint linter
	$(GOLANGCI_LINT_BIN) run -n

test:
	go test $(shell go list ./... | grep -v third_party/)

clean:
	rm -rf cosign
	rm -rf cosigned
	rm -rf sget
	rm -rf dist/


KOCACHE_PATH=/tmp/ko
ARTIFACT_HUB_LABELS=--image-label io.artifacthub.package.readme-url="https://raw.githubusercontent.com/sigstore/cosign/main/README.md" \
                    --image-label io.artifacthub.package.logo-url=https://raw.githubusercontent.com/sigstore/cosign/main/images/logo.svg \
                    --image-label io.artifacthub.package.license=Apache-2.0 --image-label io.artifacthub.package.vendor=sigstore \
                    --image-label io.artifacthub.package.version=0.1.0 \
                    --image-label io.artifacthub.package.name=cosign \
                    --image-label org.opencontainers.image.created=$(BUILD_DATE) \
                    --image-label org.opencontainers.image.description="Container signing verification and storage in an OCI registry" \
                    --image-label io.artifacthub.package.alternative-locations="oci://ghcr.io/sigstore/cosign/cosign"

define create_kocache_path
  mkdir -p $(KOCACHE_PATH)
endef

##########
# ko build
##########
.PHONY: ko
ko: ko-cosign ko-sget ko-cosigned

.PHONY: ko-cosign
ko-cosign:
	$(create_kocache_path)
	LDFLAGS="$(LDFLAGS)" GIT_HASH=$(GIT_HASH) GIT_VERSION=$(GIT_VERSION) \
	KOCACHE=$(KOCACHE_PATH) ko build --base-import-paths \
		--platform=all --tags $(GIT_VERSION) --tags $(GIT_HASH)$(LATEST_TAG) \
		$(ARTIFACT_HUB_LABELS) --image-refs cosignImagerefs \
		github.com/sigstore/cosign/cmd/cosign

.PHONY: ko-sget
ko-sget:
	# sget
	LDFLAGS="$(LDFLAGS)" GIT_HASH=$(GIT_HASH) GIT_VERSION=$(GIT_VERSION) \
	KOCACHE=$(KOCACHE_PATH) ko build --base-import-paths \
		--platform=all --tags $(GIT_VERSION) --tags $(GIT_HASH)$(LATEST_TAG) \
		--image-refs sgetImagerefs \
		github.com/sigstore/cosign/cmd/sget

.PHONY: ko-cosigned
ko-cosigned: kustomize-cosigned ko-policy-webhook
	# cosigned
	LDFLAGS="$(LDFLAGS)" GIT_HASH=$(GIT_HASH) GIT_VERSION=$(GIT_VERSION) \
	KOCACHE=$(KOCACHE_PATH) KO_DOCKER_REPO=$(KO_PREFIX)/cosigned ko resolve --bare \
		--platform=$(COSIGNED_ARCHS) --tags $(GIT_VERSION) --tags $(GIT_HASH)$(LATEST_TAG) \
		--image-refs cosignedImagerefs --filename config/webhook.yaml >> $(COSIGNED_YAML)

ko-policy-webhook:
	# policy_webhook
	LDFLAGS="$(LDFLAGS)" GIT_HASH=$(GIT_HASH) GIT_VERSION=$(GIT_VERSION) \
	KOCACHE=$(KOCACHE_PATH) KO_DOCKER_REPO=$(KO_PREFIX)/policy-webhook ko resolve --bare \
		--platform=$(COSIGNED_ARCHS) --tags $(GIT_VERSION) --tags $(GIT_HASH)$(LATEST_TAG) \
		--image-refs policyImagerefs --filename config/policy-webhook.yaml >> $(COSIGNED_YAML)

.PHONY: ko-local
ko-local:
	$(create_kocache_path)
	LDFLAGS="$(LDFLAGS)" GIT_HASH=$(GIT_HASH) GIT_VERSION=$(GIT_VERSION) \
	KOCACHE=$(KOCACHE_PATH) ko build --base-import-paths \
		--tags $(GIT_VERSION) --tags $(GIT_HASH) --local \
		$(ARTIFACT_HUB_LABELS) \
		github.com/sigstore/cosign/cmd/cosign

	LDFLAGS="$(LDFLAGS)" GIT_HASH=$(GIT_HASH) GIT_VERSION=$(GIT_VERSION) \
	KOCACHE=$(KOCACHE_PATH) ko build --base-import-paths \
		--tags $(GIT_VERSION) --tags $(GIT_HASH) --local \
		$(ARTIFACT_HUB_LABELS) \
		github.com/sigstore/cosign/cmd/cosign/webhook

	LDFLAGS="$(LDFLAGS)" GIT_HASH=$(GIT_HASH) GIT_VERSION=$(GIT_VERSION) \
	KOCACHE=$(KOCACHE_PATH) ko build --base-import-paths \
		--tags $(GIT_VERSION) --tags $(GIT_HASH) --local \
		$(ARTIFACT_HUB_LABELS) \
		github.com/sigstore/cosign/cmd/cosign/policy_webhook

.PHONY: ko-apply
ko-apply:
	LDFLAGS="$(LDFLAGS)" GIT_HASH=$(GIT_HASH) GIT_VERSION=$(GIT_VERSION) ko apply -Bf config/


.PHONY: kustomize-cosigned
kustomize-cosigned:
	kustomize build config/ > $(COSIGNED_YAML)

##################
# help
##################

help: # Display help
	@awk -F ':|##' \
		'/^[^\t].+?:.*?##/ {\
			printf "\033[36m%-30s\033[0m %s\n", $$1, $$NF \
		}' $(MAKEFILE_LIST) | sort

include release/release.mk
include test/ci.mk

##########################
# Documentation generation
##########################

.PHONY: docgen
docgen:
	go run -tags pivkey,pkcs11key,cgo ./cmd/help/

编译后会将编译好的镜像push到仓库，并且生成一个yaml文件cosign-dirty-tag，使用它可以直接完成部署

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