diff --git a/.dockerignore b/.dockerignore new file mode 100644 index 0000000..c41cc9e --- /dev/null +++ b/.dockerignore @@ -0,0 +1 @@ +/target \ No newline at end of file diff --git a/.github/workflows/build-and-test.yaml b/.github/workflows/build-and-test.yaml new file mode 100644 index 0000000..0d635cb --- /dev/null +++ b/.github/workflows/build-and-test.yaml @@ -0,0 +1,90 @@ +name: Build and Test + +on: + push: + branches: + - main + pull_request: + branches: + - main + +jobs: + lint: + runs-on: ubuntu-latest + steps: + - name: Checkout + uses: actions/checkout@v2 + - name: Check Code Style + uses: golangci/golangci-lint-action@v2 + with: + version: v1.30.0 + + build: + runs-on: ubuntu-latest + needs: lint + steps: + - name: Checkout + uses: actions/checkout@v2 + - name: Set up QEMU + uses: docker/setup-qemu-action@v1 + - name: Set up Docker Buildx + uses: docker/setup-buildx-action@v1 + - name: Build + id: docker_build + uses: docker/build-push-action@v2 + with: + tags: kloeckner-i/db-auth-gateway:${{ github.sha }} + outputs: type=docker,dest=/tmp/db-auth-gateway.tar + - name: Upload docker image artifact + uses: actions/upload-artifact@v2 + with: + name: docker-image + path: /tmp/db-auth-gateway.tar + + test: + runs-on: ubuntu-latest + needs: build + steps: + - name: Checkout + uses: actions/checkout@v2 + - name: Set up QEMU + uses: docker/setup-qemu-action@v1 + - name: Set up Docker Buildx + uses: docker/setup-buildx-action@v1 + - name: Download artifact + uses: actions/download-artifact@v2 + with: + name: docker-image + path: /tmp + - name: Load Docker image + run: docker load --input /tmp/db-auth-gateway.tar + - name: Start Google Cloud SQL Mock and Dependencies + run: | + docker network create db-auth-gateway-test + docker run -d --network=db-auth-gateway-test --network-alias=postgres --name=postgres -e "POSTGRES_PASSWORD=mysecretpassword" postgres:13 + docker run -d --network=db-auth-gateway-test --name=cloudsql_mock -p 127.0.0.1:3307:3307 -p 127.0.0.1:8080:8080 kloeckner-i/db-auth-gateway:${{ github.sha }} mock --db-address=postgres:5432 --instance=my-project:my-region:my-database + - name: Test + env: + MOCK_ADDRESS: 127.0.0.1 + run: | + make test e2e + - name: Upload Test Logs + uses: actions/upload-artifact@v2 + if: failure() + with: + name: test-logs + path: target/db-auth-gateway.log + - name: Collect Docker Logs + if: failure() + uses: jwalton/gh-docker-logs@v1 + with: + dest: './logs' + - name: Tar Docker Logs + if: failure() + run: tar cvzf ./logs.tgz ./logs + - name: Upload Docker Logs + uses: actions/upload-artifact@v2 + if: failure() + with: + name: docker-logs + path: ./logs.tgz \ No newline at end of file diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..1a05e5d --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +/.idea +/target \ No newline at end of file diff --git a/.golangci.yml b/.golangci.yml new file mode 100644 index 0000000..9ec01a6 --- /dev/null +++ b/.golangci.yml @@ -0,0 +1,14 @@ +linters-settings: + gocognit: + min-complexity: 50 + funlen: + lines: 150 + statements: 50 + nestif: + min-complexity: 10 + +issues: + exclude-rules: + - path: internal/pubkey/pubkey.go + linters: + - goimports \ No newline at end of file diff --git a/Dockerfile b/Dockerfile index a7e97d3..74958e7 100644 --- a/Dockerfile +++ b/Dockerfile @@ -1,3 +1,20 @@ -FROM alpine:3.13 +FROM golang:1.15.0-alpine AS builder -RUN echo 'hello world' > /etc/motd \ No newline at end of file +RUN apk add --update --no-cache make +WORKDIR /build + +COPY . /build/ + +RUN make + +FROM alpine:3.12.0 + +COPY --from=builder /build/target/db-auth-gateway /usr/local/bin/db-auth-gateway +COPY --from=builder /build/LICENSE /LICENSE + +RUN addgroup -g 65532 -S gateway \ + && adduser -u 65532 -S gateway -G gateway + +USER 65532 + +ENTRYPOINT [ "/usr/local/bin/db-auth-gateway" ] \ No newline at end of file diff --git a/LICENSE b/LICENSE index 261eeb9..134f5c2 100644 --- a/LICENSE +++ b/LICENSE @@ -199,3 +199,26 @@ 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. + +internal/util/connection.go: + + Copyright (c) 2014 Juan Batiz-Benet + Copyright (2) 2021 Kloeckner.I + + Permission is hereby granted, free of charge, to any person obtaining a copy + of this software and associated documentation files (the "Software"), to deal + in the Software without restriction, including without limitation the rights + to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + copies of the Software, and to permit persons to whom the Software is + furnished to do so, subject to the following conditions: + + The above copyright notice and this permission notice shall be included in + all copies or substantial portions of the Software. + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + THE SOFTWARE. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..5b6411a --- /dev/null +++ b/Makefile @@ -0,0 +1,31 @@ +BIN = target/db-auth-gateway +SRC = $(shell find . -type f -name '*.go') + +$(BIN): $(SRC) + @mkdir -p target + @go build -o $@ cmd/main.go + +test: $(SRC) + @go test ./... + +e2e: $(SRC) $(BIN) + @go test -tags=e2e ./test/... + +start_mock: $(SRC) + @-docker-compose down + @docker-compose build + @docker-compose up -d + +lint: $(SRC) + @go mod tidy + @gofumpt -s -l -w $^ + @gci -w $^ + @golint ./... + @golangci-lint run --timeout 5m0s --enable-all -D gochecknoglobals -D gomnd ./... + +clean: + @-rm -Rf target/* + @go clean -testcache + @-docker-compose down + +.PHONY: test e2e start_mock lint clean diff --git a/README.md b/README.md index 7ef77fb..f557659 100644 --- a/README.md +++ b/README.md @@ -1,2 +1,126 @@ +

+db-auth-gateway +

+ # db-auth-gateway -An authentication proxy for Google Cloud managed databases + +An authentication proxy for Google Cloud managed databases. Based on the ideas +of [cloudsql-proxy](https://github.com/GoogleCloudPlatform/cloudsql-proxy) but +intended to be run as a standalone network accessible service rather than a +sidecar. + +We've been using `cloudsql-proxy` for several years now to power our +[db-operator](https://github.com/kloeckner-i/db-operator) project. It has been +for the most part reliable but key differences between how we deploy it and +Google's reference architecture have led to production issues. + +We developed `db-auth-gateway` to address these issues and add a variety of wish +list features such as improved observability, and testing. + +## Features + +* Connection draining during shutdown to support zero downtime deployments and +load balancing. +* Prometheus metrics support for improved observability. +* Full testsuite including realistic Google service mocks. +* Simplified modern code base. + +## Quickstart + +Use `docker-compose` to start a local PostgreSQL instance, and Google API mock: + +```shell script +make start_mock +``` + +Then you can then run `db-auth-gateway` locally with: + +```shell script +db-auth-gateway --api-endpoint=http://localhost:8080 --credential-file=DISABLED \ +--instance=my-project:my-region:my-database +``` + +`db-auth-gateway` will listen on port 5432 (by default) for SQL connections. + +```shell script +PGPASSWORD=mysecretpassword psql -h localhost -p 5432 -d postgres postgres +``` + +### Flags + +`db-auth-gateway` has a variety of command line flags for configuring its behavior: + +| Flag | Default | Description | +|:---|:---:|:---| +| --credential-file | | JSON file containing the Google Cloud credentials | +| --instance | | Fully qualified database instance to connect to (project:region:name) | +| --listen | :5432 | Address and port to listen on | +| --remote-port | 3307 | Port to connect to the remote server on | +| --max-connections | 0 | The maximum number of active connections. Defaults to 0 (unlimited) | +| --min-refresh-interval | 1m | The minimum amount of time to wait between API calls | +| --periodic-refresh-interval | 5m | Configuration is eagerly refreshed on a schedule. This is the nominal period between API calls. | +| --api-endpoint | | If specified the URL to use for API calls | + +## Development + +### Prerequisites + +* [Go 1.15+](https://golang.org/dl/) +* GNU Make +* [golangci-lint v1.30+](https://golangci-lint.run/usage/install/) +* Additional Go tools: + * [golint](https://github.com/golang/lint) + * [gofumpt](https://github.com/mvdan/gofumpt) + * [gofumports](https://github.com/mvdan/gofumpt) + * [gci](https://github.com/daixiang0/gci) + +### Build + +To build `db-auth-gateway`, simply run make without any arguments. + +The resulting binary will be written to: `./target/db-auth-gateway`. + +```shell script +make +``` + +### Test + +Before committing any code you should always lint and test your changes. + +#### Code Linting + +```shell script +make lint +``` + +#### Running the Tests + +First start the Google API mock using `docker-compose`: + +```shell script +make start_mock +``` + +Then run the tests: + +```shell script +make test +``` + +### End to End Testing + +You run the end to end tests with: + +```shell script +make e2e +``` + +The tests will start a local instance of `db-auth-gateway` and verify it is able +to connect to and query the Postgres database, and Google API mock. + +## Acknowledgements + +1. [The Go Gopher](https://blog.golang.org/gopher) by [Renee French](http://reneefrench.blogspot.com/), licensed under the [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/). +1. https://github.com/GoogleCloudPlatform/cloudsql-proxy +1. https://github.com/jbenet/go-context diff --git a/cmd/main.go b/cmd/main.go new file mode 100644 index 0000000..9a059df --- /dev/null +++ b/cmd/main.go @@ -0,0 +1,259 @@ +package main + +/* + * Copyright 2021 kloeckner.i GmbH + * + * 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. + */ + +import ( + "context" + "crypto/x509/pkix" + "net/http" + "os" + "os/signal" + "syscall" + "time" + + pkg "github.com/kloeckner-i/db-auth-gateway/internal" + "github.com/kloeckner-i/db-auth-gateway/internal/api" + "github.com/kloeckner-i/db-auth-gateway/internal/config" + "github.com/kloeckner-i/db-auth-gateway/internal/mock" + "github.com/kloeckner-i/db-auth-gateway/internal/pubkey" + "github.com/prometheus/client_golang/prometheus/promhttp" + log "github.com/sirupsen/logrus" + "github.com/spf13/cobra" + "golang.org/x/term" +) + +const ( + defaultMinRefreshInterval = time.Minute + defaultPeriodicRefreshInterval = 5 * time.Minute +) + +func main() { + log.SetFormatter(&log.JSONFormatter{}) + + if term.IsTerminal(int(os.Stdout.Fd())) { + log.SetLevel(log.DebugLevel) + log.SetFormatter(&log.TextFormatter{}) + } + + if err := execute(); err != nil { + log.WithFields(log.Fields{ + "err": err, + }).Fatal("Failed to execute command") + } +} + +func execute() error { + rootCmd := &cobra.Command{ + Use: "db-auth-gateway", + Short: "db-auth-gateway is an authentication proxy for Google Cloud managed databases", + RunE: startGateway, + } + + rootCmd.Flags().String("credential-file", "", "JSON file containing the Google Cloud credentials") + rootCmd.Flags().String("instance", "", "Fully qualified database instance to connect to (project:region:name)") + rootCmd.Flags().StringP("listen", "l", ":5432", "Address and port to listen on") + rootCmd.Flags().Int("remote-port", 3307, "Port to connect to the remote server on") + rootCmd.Flags().Int64("max-connections", 0, "The maximum number of active connections. Defaults to 0 (unlimited)") + rootCmd.Flags().Duration("min-refresh-interval", defaultMinRefreshInterval, + "The minimum amount of time to wait between API calls") + rootCmd.Flags().Duration("periodic-refresh-interval", defaultPeriodicRefreshInterval, + "Eagerly refresh the database configuration to avoid stale client certificates. "+ + "This duration is only a nominal value, each refresh cycle will vary by up to fifty percent.") + rootCmd.Flags().String("api-endpoint", "", "If specified the URL to use for API calls") + + if err := rootCmd.MarkFlagRequired("credential-file"); err != nil { + return err + } + + if err := rootCmd.MarkFlagRequired("instance"); err != nil { + return err + } + + mockCmd := &cobra.Command{ + Use: "mock", + Short: "Run a local Google managed database mock (for testing)", + RunE: startMock, + } + + mockCmd.Flags().String("instance", "", "Fully qualified database instance to connect to (project:region:name)") + mockCmd.Flags().String("db-address", "", "Address of the database for which to proxy") + mockCmd.Flags().Int("api-port", 8080, "Port on which to serve the mocked sqladmin API") + mockCmd.Flags().Int("proxy-port", 3307, "Port on which to serve the database proxy") + + if err := mockCmd.MarkFlagRequired("instance"); err != nil { + return err + } + + if err := mockCmd.MarkFlagRequired("db-address"); err != nil { + return err + } + + rootCmd.AddCommand(mockCmd) + + if err := rootCmd.Execute(); err != nil { + return err + } + + return nil +} + +func startGateway(cmd *cobra.Command, args []string) error { + listenAddress, err := cmd.Flags().GetString("listen") + if err != nil { + return err + } + + remotePort, err := cmd.Flags().GetInt("remote-port") + if err != nil { + return err + } + + credentialFile, err := cmd.Flags().GetString("credential-file") + if err != nil { + return err + } + + instance, err := cmd.Flags().GetString("instance") + if err != nil { + return err + } + + maxConnections, err := cmd.Flags().GetInt64("max-connections") + if err != nil { + return err + } + + minRefreshInterval, err := cmd.Flags().GetDuration("min-refresh-interval") + if err != nil { + return err + } + + periodicRefreshInterval, err := cmd.Flags().GetDuration("periodic-refresh-interval") + if err != nil { + return err + } + + apiEndpoint, err := cmd.Flags().GetString("api-endpoint") + if err != nil { + return err + } + + ctx, ctxCancel := context.WithCancel(context.Background()) + + apiClient, err := api.NewClientFromCredentialFile(ctx, credentialFile, apiEndpoint) + if err != nil { + ctxCancel() + + return err + } + + configProvider, err := config.NewConfigProvider(ctx, apiClient, instance, minRefreshInterval, periodicRefreshInterval) + if err != nil { + ctxCancel() + + return err + } + + signals := make(chan os.Signal, 1) + signal.Notify(signals, syscall.SIGTERM, syscall.SIGINT) + + go func() { + <-signals + + log.Info("Received term signal, gracefully shutting down") + + ctxCancel() + }() + + http.Handle("/metrics", promhttp.Handler()) + + go func() { + prometheusAddress := ":9090" + + log.WithFields(log.Fields{ + "prometheusAddress": prometheusAddress, + }).Info("Starting prometheus metrics server") + + if err := http.ListenAndServe(prometheusAddress, nil); err != nil { + log.WithFields(log.Fields{ + "err": err, + }).Fatal("Failed to start prometheus metrics server") + } + }() + + gateway := pkg.Gateway{ + ListenAddress: listenAddress, + RemotePort: remotePort, + CredentialFile: credentialFile, + Instance: instance, + MaxConnections: maxConnections, + ConfigProvider: configProvider, + } + + return gateway.Run(ctx) +} + +func startMock(cmd *cobra.Command, args []string) error { + instance, err := cmd.Flags().GetString("instance") + if err != nil { + return err + } + + dbAddress, err := cmd.Flags().GetString("db-address") + if err != nil { + return err + } + + apiPort, err := cmd.Flags().GetInt("api-port") + if err != nil { + return err + } + + proxyPort, err := cmd.Flags().GetInt("proxy-port") + if err != nil { + return err + } + + authority, err := pubkey.NewAuthority(pkix.Name{ + CommonName: "Mock CA", + }, time.Hour) + if err != nil { + log.Fatal(err) + } + + dbProxy, err := mock.NewDatabaseProxy(authority, proxyPort, instance, dbAddress) + if err != nil { + log.Fatal(err) + } + + sqlAdminAPI, err := mock.NewSQLAdminAPI(dbProxy, authority, apiPort) + if err != nil { + log.Fatal(err) + } + + go func() { + if err := dbProxy.Run(); err != nil { + log.Fatal(err) + } + }() + + if err := sqlAdminAPI.Run(); err != nil { + log.Fatal(err) + } + + return nil +} diff --git a/docker-compose.yml b/docker-compose.yml new file mode 100644 index 0000000..20d4be1 --- /dev/null +++ b/docker-compose.yml @@ -0,0 +1,20 @@ +version: "3.6" + +services: + postgres: + image: postgres:13 + restart: always + environment: + POSTGRES_PASSWORD: mysecretpassword + + mock: + build: + context: . + dockerfile: Dockerfile + command: + - mock + - --db-address=postgres:5432 + - --instance=my-project:my-region:my-database + ports: + - "127.0.0.1:3307:3307" + - "127.0.0.1:8080:8080" \ No newline at end of file diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..c4cdbac --- /dev/null +++ b/go.mod @@ -0,0 +1,23 @@ +module github.com/kloeckner-i/db-auth-gateway + +go 1.15 + +require ( + cloud.google.com/go v0.78.0 // indirect + github.com/gorilla/mux v1.8.0 + github.com/jackc/pgproto3/v2 v2.0.7 // indirect + github.com/jackc/pgx/v4 v4.11.0 + github.com/magefile/mage v1.11.0 // indirect + github.com/prometheus/client_golang v1.3.0 + github.com/sirupsen/logrus v1.8.0 + github.com/spf13/cobra v1.1.3 + github.com/stretchr/testify v1.7.0 + golang.org/x/crypto v0.0.0-20210503195802-e9a32991a82e // indirect + golang.org/x/oauth2 v0.0.0-20210218202405-ba52d332ba99 + golang.org/x/sys v0.0.0-20210305034016-7844c3c200c3 // indirect + golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 + golang.org/x/text v0.3.6 // indirect + google.golang.org/api v0.40.0 + gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect + gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..8739d5f --- /dev/null +++ b/go.sum @@ -0,0 +1,868 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= +cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= +cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= +cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0= +cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To= +cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4= +cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M= +cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc= +cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk= +cloud.google.com/go 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2015 Google Inc. All Rights Reserved. + * Copyright 2021 kloeckner.i GmbH + * + * 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. + */ + +import ( + "context" + "crypto" + "crypto/x509" + "encoding/pem" + "errors" + "fmt" + "io/ioutil" + "time" + + "github.com/kloeckner-i/db-auth-gateway/internal/util" + "golang.org/x/oauth2" + goauth "golang.org/x/oauth2/google" + "google.golang.org/api/option" + sqladmin "google.golang.org/api/sqladmin/v1beta4" +) + +// DisabledCredentialFile is a special value for the credential file path that we disable oauth authentication +// this is used for local testing. +const DisabledCredentialFile = "DISABLED" + +// ErrUnsupportedDatabaseVersion is returned when a user attempts to use db-auth-gateway +// with an incompatible database version. +var ErrUnsupportedDatabaseVersion = errors.New("unsupported database version") + +// Client is an instance of the cloud database api client for use with Google Cloud. +type Client struct { + sqladminService *sqladmin.Service +} + +// NewClientFromCredentialFile constructs a new Google Cloud API client from the supplied JSON credential file. +func NewClientFromCredentialFile(ctx context.Context, credentialFile, apiEndpoint string) (*Client, error) { + var credentialJSON []byte + + if credentialFile != DisabledCredentialFile { + var err error + + credentialJSON, err = ioutil.ReadFile(credentialFile) + if err != nil { + return nil, err + } + } + + opts := []option.ClientOption{ + option.WithScopes(sqladmin.SqlserviceAdminScope), + } + + if apiEndpoint != "" { + opts = append(opts, option.WithEndpoint(apiEndpoint)) + } + + if credentialFile == DisabledCredentialFile { + opts = append(opts, option.WithHTTPClient(oauth2.NewClient(ctx, &disabledTokenSource{}))) + } else if cfg, err := goauth.JWTConfigFromJSON(credentialJSON, sqladmin.SqlserviceAdminScope); err == nil { + opts = append(opts, option.WithHTTPClient(cfg.Client(ctx))) + } else { + cred, err := goauth.CredentialsFromJSON(ctx, credentialJSON, sqladmin.SqlserviceAdminScope) + if err != nil { + return nil, err + } + + opts = append(opts, option.WithHTTPClient(oauth2.NewClient(ctx, cred.TokenSource))) + } + + sqladminService, err := sqladmin.NewService(ctx, opts...) + if err != nil { + return nil, err + } + + return &Client{sqladminService}, nil +} + +// GetInstance queries the API for information about a given database instance. +func (c *Client) GetInstance(instance string) (*sqladmin.DatabaseInstance, error) { + parsedInstance, err := util.ParseInstance(instance) + if err != nil { + return nil, err + } + + regionName := fmt.Sprintf("%s~%s", parsedInstance["region"], parsedInstance["name"]) + + dbInstance, err := c.sqladminService.Instances.Get(parsedInstance["project"], regionName).Do() + if err != nil { + return nil, err + } + + if dbInstance.BackendType != "SECOND_GEN" { + return nil, ErrUnsupportedDatabaseVersion + } + + return dbInstance, nil +} + +// CreateClientCertificate is used to create a new ephemeral client certificate from the supplied key pair. +// This client certificate is used for mutual TLS authentication with the database. +func (c *Client) CreateClientCertificate(instance string, pubKey crypto.PublicKey) (*sqladmin.SslCert, error) { + pkix, err := x509.MarshalPKIXPublicKey(pubKey) + if err != nil { + return nil, err + } + + parsedInstance, err := util.ParseInstance(instance) + if err != nil { + return nil, err + } + + regionName := fmt.Sprintf("%s~%s", parsedInstance["region"], parsedInstance["name"]) + req := c.sqladminService.SslCerts.CreateEphemeral(parsedInstance["project"], regionName, + &sqladmin.SslCertsCreateEphemeralRequest{ + PublicKey: string(pem.EncodeToMemory(&pem.Block{Bytes: pkix, Type: "RSA PUBLIC KEY"})), + }, + ) + + return req.Do() +} + +// disabledTokenSource is a mocked oauth token source for local testing. +type disabledTokenSource struct{} + +// Token issues a mocked bearer token for local testing. +func (ts *disabledTokenSource) Token() (*oauth2.Token, error) { + return &oauth2.Token{ + AccessToken: "let-me-in-pls", + TokenType: "Bearer", + RefreshToken: "gimme-the-new-key-thx", + Expiry: time.Now().Add(time.Hour), + }, nil +} diff --git a/internal/config/config.go b/internal/config/config.go new file mode 100644 index 0000000..cb40212 --- /dev/null +++ b/internal/config/config.go @@ -0,0 +1,270 @@ +package config + +/* + * Copyright 2015 Google Inc. All Rights Reserved. + * Copyright 2021 kloeckner.i GmbH + * + * 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. + */ + +import ( + "context" + "crypto/rand" + "crypto/rsa" + "crypto/tls" + "crypto/x509" + "errors" + mrand "math/rand" + "os" + "sync" + "time" + + "github.com/kloeckner-i/db-auth-gateway/internal/api" + "github.com/kloeckner-i/db-auth-gateway/internal/pubkey" + "github.com/prometheus/client_golang/prometheus" + "github.com/prometheus/client_golang/prometheus/promauto" + log "github.com/sirupsen/logrus" + sqladmin "google.golang.org/api/sqladmin/v1beta4" +) + +// ErrNoPrimaryAddress is returned when a database does not have a valid primary address. +var ErrNoPrimaryAddress = errors.New("no primary address found for database") + +// Prometheus meters. +var ( + configRefreshDurationMeter = promauto.NewSummary(prometheus.SummaryOpts{ + Name: "config_refresh_duration", + Help: "The duration elapsed between configuration refreshes", + }) + configRefreshSuccessMeter = promauto.NewGauge(prometheus.GaugeOpts{ + Name: "config_refresh_success", + Help: "The number of times that configuration refreshes have succeeded", + }) + configRefreshFailuresMeter = promauto.NewGauge(prometheus.GaugeOpts{ + Name: "config_refresh_failure", + Help: "The number of times that configuration refreshes have failed", + }) +) + +// Provider is a cached configuration provider. We cache the database configuration so that we don't spam +// the Google Cloud API and use excess API quota. +type Provider interface { + GetPrimaryAddress() (string, error) + GetClientCertificate() (*tls.Certificate, error) + GetAuthorityCertificate() (*x509.Certificate, error) + RefreshConfig() error +} + +// GCloudProvider is a configuration provider for Google Cloud managed databases. +type GCloudProvider struct { + mu sync.Mutex + ctx context.Context + apiClient *api.Client + instance string + minRefreshInterval time.Duration + periodicRefreshInterval time.Duration + keyPair *rsa.PrivateKey + clientCertificate *tls.Certificate + dbInstance *sqladmin.DatabaseInstance + lastRefresh time.Time +} + +// NewConfigProvider constructs a new configuration provider from an API client and instance. +func NewConfigProvider(ctx context.Context, + apiClient *api.Client, instance string, + minRefreshInterval, periodicRefreshInterval time.Duration) (Provider, error) { + log.Info("Generating RSA key pair for encrypting connections") + + // Generate a new RSA key pair which will be used for our client certificates + keyPair, err := rsa.GenerateKey(rand.Reader, 2048) + if err != nil { + return nil, err + } + + configProvider := &GCloudProvider{ + ctx: ctx, + apiClient: apiClient, + instance: instance, + minRefreshInterval: minRefreshInterval, + periodicRefreshInterval: periodicRefreshInterval, + keyPair: keyPair, + } + + // If not uniquely seeded the math random sequence will be the same for every instance, + // this is obviously what we are trying to avoid. + mrand.Seed(time.Now().UTC().UnixNano() ^ int64(os.Getpid())) + + // Periodically refresh the ephemeral client certificate. + go configProvider.periodicRefreshTask() + + return configProvider, nil +} + +// GetPrimaryAddress returns the active primary ip address of the database (eg. its public load balancer). +func (p *GCloudProvider) GetPrimaryAddress() (string, error) { + p.mu.Lock() + dbInstance := p.dbInstance + p.mu.Unlock() + + if dbInstance == nil { + if err := p.RefreshConfig(); err != nil { + return "", err + } + + p.mu.Lock() + dbInstance = p.dbInstance + p.mu.Unlock() + } + + var primaryAddress string + + for _, addr := range dbInstance.IpAddresses { + if addr.Type == "PRIMARY" { + primaryAddress = addr.IpAddress + } + } + + if primaryAddress == "" { + return "", ErrNoPrimaryAddress + } + + return primaryAddress, nil +} + +// GetClientCertificate returns the latest ephemeral client certificate. +func (p *GCloudProvider) GetClientCertificate() (*tls.Certificate, error) { + p.mu.Lock() + clientCertificate := p.clientCertificate + p.mu.Unlock() + + if clientCertificate == nil { + if err := p.RefreshConfig(); err != nil { + return nil, err + } + + p.mu.Lock() + clientCertificate = p.clientCertificate + p.mu.Unlock() + } + + return clientCertificate, nil +} + +// GetAuthorityCertificate returns the latest root certificate authority. +func (p *GCloudProvider) GetAuthorityCertificate() (*x509.Certificate, error) { + p.mu.Lock() + dbInstance := p.dbInstance + p.mu.Unlock() + + if dbInstance == nil { + if err := p.RefreshConfig(); err != nil { + return nil, err + } + + p.mu.Lock() + dbInstance = p.dbInstance + p.mu.Unlock() + } + + return pubkey.ParseCertificate(dbInstance.ServerCaCert.Cert) +} + +// RefreshConfig downloads the latest database configuration and issues an updated client certificate. +func (p *GCloudProvider) RefreshConfig() error { + p.mu.Lock() + defer p.mu.Unlock() + + // To avoid exhausting client API quota, don't spam it. + log.WithFields(log.Fields{ + "minRefreshInterval": p.minRefreshInterval, + "sinceLastRefresh": time.Since(p.lastRefresh), + }).Info("Checking time of last configuration refresh") + + if time.Since(p.lastRefresh) < p.minRefreshInterval { + log.Warn("Not refreshing configuration due to a recent refresh having already occurred") + + return nil + } + + log.Info("Fetching updated database configuration") + + var err error + + p.dbInstance, err = p.apiClient.GetInstance(p.instance) + if err != nil { + configRefreshFailuresMeter.Inc() + + return err + } + + log.Info("Fetching new client certificate") + + resp, err := p.apiClient.CreateClientCertificate(p.instance, p.keyPair.Public()) + if err != nil { + configRefreshFailuresMeter.Inc() + + return err + } + + cert, err := pubkey.ParseCertificate(resp.Cert) + if err != nil { + configRefreshFailuresMeter.Inc() + + return err + } + + log.WithFields(log.Fields{ + "fingerprint": pubkey.Fingerprint(cert), + }).Info("Received new client certificate") + + p.clientCertificate = &tls.Certificate{ + Certificate: [][]byte{cert.Raw}, + PrivateKey: p.keyPair, + Leaf: cert, + } + + configRefreshDurationMeter.Observe(float64(time.Since(p.lastRefresh)) / float64(time.Second)) + + configRefreshSuccessMeter.Inc() + + p.lastRefresh = time.Now() + + return nil +} + +func (p *GCloudProvider) periodicRefreshTask() { + for { + /* #nosec */ + refreshCycleInterval := p.periodicRefreshInterval/2 + time.Duration(mrand.Int63n(int64(p.periodicRefreshInterval))) + if refreshCycleInterval < p.minRefreshInterval { + refreshCycleInterval = p.minRefreshInterval + } + + log.WithFields(log.Fields{ + "refreshCycleInterval": refreshCycleInterval, + }).Info("Waiting for next client certificate refresh") + + select { + case <-time.After(refreshCycleInterval): + log.Info("Client certificate will expire soon, attempting refresh") + + if err := p.RefreshConfig(); err != nil { + log.WithFields(log.Fields{ + "err": err, + }).Warn("Periodic configuration refresh failed") + } + case <-p.ctx.Done(): + return + } + } +} diff --git a/internal/config/config_test.go b/internal/config/config_test.go new file mode 100644 index 0000000..80213e7 --- /dev/null +++ b/internal/config/config_test.go @@ -0,0 +1,115 @@ +package config_test + +/* + * Copyright 2021 kloeckner.i GmbH + * + * 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. + */ + +import ( + "context" + "crypto/x509" + "testing" + "time" + + "github.com/kloeckner-i/db-auth-gateway/internal/api" + "github.com/kloeckner-i/db-auth-gateway/internal/config" + "github.com/kloeckner-i/db-auth-gateway/internal/util" + "github.com/stretchr/testify/assert" +) + +func TestGetPrimaryAddress(t *testing.T) { + configProvider, err := newConfigProvider() + if err != nil { + t.Fatal(err) + } + + primaryAddress, err := configProvider.GetPrimaryAddress() + if err != nil { + t.Fatal(err) + } + + assert.Equal(t, util.GetMockAddress(), primaryAddress) +} + +func TestGetClientCertificate(t *testing.T) { + configProvider, err := newConfigProvider() + if err != nil { + t.Fatal(err) + } + + clientCertificate, err := configProvider.GetClientCertificate() + if err != nil { + t.Fatal(err) + } + + parsedCertificate, err := x509.ParseCertificate(clientCertificate.Certificate[0]) + if err != nil { + t.Fatal(err) + } + + assert.Equal(t, "ephemeral-client-certificate", parsedCertificate.Subject.CommonName) +} + +func TestGetAuthorityCertificate(t *testing.T) { + configProvider, err := newConfigProvider() + if err != nil { + t.Fatal(err) + } + + parsedCertificate, err := configProvider.GetAuthorityCertificate() + if err != nil { + t.Fatal(err) + } + + assert.Equal(t, "Mock CA", parsedCertificate.Subject.CommonName) +} + +func TestRefreshConfig(t *testing.T) { + configProvider, err := newConfigProvider() + if err != nil { + t.Fatal(err) + } + + cert, err := configProvider.GetClientCertificate() + if err != nil { + t.Fatal(err) + } + + oldCert := cert.Certificate[0] + + if err := configProvider.RefreshConfig(); err != nil { + t.Fatal(err) + } + + cert, err = configProvider.GetClientCertificate() + if err != nil { + t.Fatal(err) + } + + newCert := cert.Certificate[0] + + assert.NotEqual(t, oldCert, newCert) +} + +func newConfigProvider() (config.Provider, error) { + ctx := context.Background() + + apiClient, err := api.NewClientFromCredentialFile(ctx, api.DisabledCredentialFile, + "http://"+util.GetMockAddress()+":8080") + if err != nil { + return nil, err + } + + return config.NewConfigProvider(ctx, apiClient, "my-project:my-region:my-database", 0, time.Minute) +} diff --git a/internal/gateway.go b/internal/gateway.go new file mode 100644 index 0000000..fda9f39 --- /dev/null +++ b/internal/gateway.go @@ -0,0 +1,365 @@ +package pkg + +/* + * Copyright 2015 Google Inc. All Rights Reserved. + * Copyright 2021 kloeckner.i GmbH + * + * 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. + */ + +import ( + "context" + "crypto/tls" + "crypto/x509" + "errors" + "fmt" + "io" + "net" + "sync" + "sync/atomic" + "time" + + "github.com/kloeckner-i/db-auth-gateway/internal/config" + "github.com/kloeckner-i/db-auth-gateway/internal/pubkey" + "github.com/kloeckner-i/db-auth-gateway/internal/util" + "github.com/prometheus/client_golang/prometheus" + "github.com/prometheus/client_golang/prometheus/promauto" + log "github.com/sirupsen/logrus" +) + +const acceptLoopInterval = 100 * time.Millisecond + +// Prometheus meters. +var ( + activeConnectionsMeter = promauto.NewGauge(prometheus.GaugeOpts{ + Name: "active_connections", + Help: "The total number of active connections", + }) + totalBytesTransferredMeter = promauto.NewSummary(prometheus.SummaryOpts{ + Name: "total_bytes_transferred", + Help: "The total number of bytes transferred between the client and the database", + }) +) + +// Gateway stores an instance of a Gateway task. +type Gateway struct { + ListenAddress string + RemotePort int + CredentialFile string + Instance string + MaxConnections int64 + ConfigProvider config.Provider +} + +// Run is used to start an instance of the Gateway task and begin accepting connections. +func (c *Gateway) Run(ctx context.Context) error { + addr, err := net.ResolveTCPAddr("tcp", c.ListenAddress) + if err != nil { + return err + } + + listener, err := net.ListenTCP("tcp", addr) + if err != nil { + return err + } + + log.WithFields(log.Fields{ + "listenAddress": c.ListenAddress, + }).Info("Accepting incoming connections") + + // We use both a waitgroup and an atomic counter so that we can leverage the strengths of both. + var ( + wg sync.WaitGroup + activeConnections int64 + ) + + // Run the proxy goroutines with their own context so we can better control the shutdown process. + proxyCtx, proxyCtxCancel := context.WithCancel(context.Background()) + + for { + select { + case <-ctx.Done(): + log.WithFields(log.Fields{ + "listenAddress": c.ListenAddress, + }).Info("Stopping listener") + + if err := listener.Close(); err != nil { + log.WithFields(log.Fields{ + "listenAddress": c.ListenAddress, + "err": err, + }).Warn("Failed to close listener") + } + + log.Info("Cancelling all active connections") + + proxyCtxCancel() + wg.Wait() + + return nil + default: + } + + // Do not block forever as we want to be able to catch context cancellations. + if err := listener.SetDeadline(time.Now().Add(acceptLoopInterval)); err != nil { + proxyCtxCancel() + + return err + } + + conn, err := listener.AcceptTCP() + if err != nil { + // Ignore the deadline messages. + if opErr, ok := err.(*net.OpError); ok && opErr.Timeout() { + continue + } + + proxyCtxCancel() + + return err + } + + clientConn := util.MakeCancellable(proxyCtx, conn) + + clientAddress := conn.RemoteAddr().String() + + // Refuse new connections if we are over the configured limit. + if c.MaxConnections > 0 && atomic.LoadInt64(&activeConnections) >= c.MaxConnections { + log.WithFields(log.Fields{ + "clientAddress": clientAddress, + "maxConnections": c.MaxConnections, + }).Info("Refusing incoming connection due to max connections limit") + + if err := clientConn.Close(); err != nil { + proxyCtxCancel() + + return err + } + + continue + } + + log.WithFields(log.Fields{ + "clientAddress": clientAddress, + }).Info("Handling incoming connection") + + activeConnectionsMeter.Inc() + + atomic.AddInt64(&activeConnections, 1) + + wg.Add(1) + + go func() { + if err := c.handleClientConnection(ctx, clientConn, clientAddress); err != nil { + log.WithFields(log.Fields{ + "clientAddress": clientAddress, + "err": err, + }).Error("Handling client connection failed") + } + + activeConnectionsMeter.Dec() + + atomic.AddInt64(&activeConnections, -1) + + wg.Done() + }() + } +} + +func (c *Gateway) handleClientConnection(ctx context.Context, + clientConn *util.CancellableConnection, clientAddress string) error { + defer func() { + log.WithFields(log.Fields{ + "clientAddress": clientAddress, + }).Info("Closing client connection") + + if err := clientConn.Close(); err != nil { + log.WithFields(log.Fields{ + "clientAddress": clientAddress, + "err": err, + }).Warn("Closing client connection failed") + } + }() + + if err := c.proxyConnection(ctx, clientConn, clientAddress); err != nil { + log.WithFields(log.Fields{ + "clientAddress": clientAddress, + "err": err, + }).Warn("Remote connection failed, trying refreshing configuration") + + if err := c.ConfigProvider.RefreshConfig(); err != nil { + log.WithFields(log.Fields{ + "clientAddress": clientAddress, + "err": err, + }).Error("Refreshing configuration failed") + } + + return err + } + + return nil +} + +func (c *Gateway) proxyConnection( + ctx context.Context, clientConn net.Conn, clientAddress string) error { + connCtx, connCancel := context.WithCancel(ctx) + + remoteConn, remoteAddress, err := c.connectRemote(connCtx) + if err != nil { + connCancel() + + return err + } + + // Link the lifecycle of the client and remote connections. + // So that they can be both cancelled with the same context. + clientConnCancellable := util.MakeCancellable(connCtx, clientConn) + + // The client connection isn't closed here as we may attempt to retry using it. + // Eg. a configuration refresh and retry. + // Closing it is delegated upstream. + defer func() { + log.WithFields(log.Fields{ + "remoteAddress": remoteAddress, + }).Info("Closing remote connection") + + if err := remoteConn.Close(); err != nil { + log.WithFields(log.Fields{ + "remoteAddress": remoteAddress, + }).Warn("Closing remote connection failed") + } + }() + + log.WithFields(log.Fields{ + "clientAddress": clientAddress, + "remoteAddress": remoteAddress, + }).Info("Proxying database connection") + + var wg sync.WaitGroup + + wg.Add(2) + + var transferred int64 + + var copyErr error + + var copyErrMu sync.Mutex + + go func() { + totalBytes, err := io.Copy(clientConnCancellable, remoteConn) + if err != nil && !errors.Is(err, context.Canceled) { + copyErrMu.Lock() + if copyErr == nil { + copyErr = err + } + copyErrMu.Unlock() + } + + log.WithFields(log.Fields{ + "remoteAddress": remoteAddress, + "totalBytes": totalBytes, + }).Info("Completed proxying from the server") + + atomic.AddInt64(&transferred, totalBytes) + + if !errors.Is(err, context.Canceled) { + log.WithFields(log.Fields{ + "remoteAddress": remoteAddress, + }).Info("Gracefully closing other half of the connection") + + // Gracefully cancel the other half of the connection. + connCancel() + } + + wg.Done() + }() + + go func() { + totalBytes, err := io.Copy(remoteConn, clientConnCancellable) + if err != nil && !errors.Is(err, context.Canceled) { + copyErrMu.Lock() + if copyErr == nil { + copyErr = err + } + copyErrMu.Unlock() + } + + log.WithFields(log.Fields{ + "clientAddress": clientAddress, + "totalBytes": totalBytes, + }).Info("Completed proxying from the client") + + atomic.AddInt64(&transferred, totalBytes) + + if !errors.Is(err, context.Canceled) { + log.WithFields(log.Fields{ + "clientAddress": clientAddress, + }).Info("Gracefully closing other half of the connection") + + // Gracefully cancel the other half of the connection. + connCancel() + } + + wg.Done() + }() + + wg.Wait() + + totalBytesTransferredMeter.Observe(float64(transferred)) + + // copyErr be nil if no errors occurred. + return copyErr +} + +func (c *Gateway) connectRemote(ctx context.Context) (*util.CancellableConnection, string, error) { + primaryAddress, err := c.ConfigProvider.GetPrimaryAddress() + if err != nil { + return nil, primaryAddress, err + } + + caCert, err := c.ConfigProvider.GetAuthorityCertificate() + if err != nil { + return nil, primaryAddress, err + } + + rootCAs := x509.NewCertPool() + rootCAs.AddCert(caCert) + + clientCert, err := c.ConfigProvider.GetClientCertificate() + if err != nil { + return nil, primaryAddress, err + } + + log.WithFields(log.Fields{ + "remoteAddress": primaryAddress, + "fingerprint": pubkey.Fingerprint(clientCert.Leaf), + }).Info("Establishing remote connection") + + /* #nosec */ + tlsConfig := &tls.Config{ + Certificates: []tls.Certificate{*clientCert}, + RootCAs: rootCAs, + // Custom server certificate validation due to: + // https://github.com/GoogleCloudPlatform/cloudsql-proxy/issues/194 + InsecureSkipVerify: true, + VerifyPeerCertificate: pubkey.NewServerCertificateValidator(rootCAs, c.Instance), + } + + var dialer net.Dialer + + conn, err := dialer.DialContext(ctx, "tcp", fmt.Sprintf("%s:%d", primaryAddress, c.RemotePort)) + if err != nil { + return nil, primaryAddress, err + } + + return util.MakeCancellable(ctx, tls.Client(conn, tlsConfig)), primaryAddress, nil +} diff --git a/internal/mock/database.go b/internal/mock/database.go new file mode 100644 index 0000000..97d2b3e --- /dev/null +++ b/internal/mock/database.go @@ -0,0 +1,218 @@ +package mock + +/* + * Copyright 2021 kloeckner.i GmbH + * + * 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. + */ + +import ( + "context" + "crypto/rand" + "crypto/rsa" + "crypto/tls" + "crypto/x509" + "crypto/x509/pkix" + "errors" + "fmt" + "io" + "net" + "sync" + "time" + + "github.com/kloeckner-i/db-auth-gateway/internal/pubkey" + "github.com/kloeckner-i/db-auth-gateway/internal/util" + log "github.com/sirupsen/logrus" +) + +// DatabaseProxy is a mutual tls proxy for the end-to-end test suite. +type DatabaseProxy struct { + ctx context.Context + ctxCancel context.CancelFunc + ctxMu sync.Mutex + authority *pubkey.Authority + serverKey *rsa.PrivateKey + serverCert *x509.Certificate + proxyPort int + dbAddress string +} + +// ErrRevokedCertificate is returned when a certificate has been revoked. +var ErrRevokedCertificate = errors.New("certificate has been revoked") + +// NewDatabaseProxy constructs a new mutual tls proxy for the supplied database. +func NewDatabaseProxy(authority *pubkey.Authority, proxyPort int, instance, dbAddress string) (*DatabaseProxy, error) { + serverKey, err := rsa.GenerateKey(rand.Reader, 2048) + if err != nil { + return nil, err + } + + pubKeyPEM, err := pubkey.EncodePublicKey(&serverKey.PublicKey) + if err != nil { + return nil, err + } + + parsedInstance, err := util.ParseInstance(instance) + if err != nil { + return nil, err + } + + projectName := fmt.Sprintf("%s:%s", parsedInstance["project"], parsedInstance["name"]) + + serverCertPEM, err := authority.Sign(pubKeyPEM, pkix.Name{ + CommonName: projectName, + }, time.Hour) + if err != nil { + return nil, err + } + + serverCert, err := pubkey.ParseCertificate(serverCertPEM) + if err != nil { + return nil, err + } + + ctx, ctxCancel := context.WithCancel(context.Background()) + + return &DatabaseProxy{ + ctx: ctx, + ctxCancel: ctxCancel, + authority: authority, + serverKey: serverKey, + serverCert: serverCert, + proxyPort: proxyPort, + dbAddress: dbAddress, + }, nil +} + +// Run starts the database mutual tls proxy. +func (dp *DatabaseProxy) Run() error { + caCert, err := pubkey.ParseCertificate(dp.authority.CertPEM()) + if err != nil { + return err + } + + caCertPool := x509.NewCertPool() + caCertPool.AddCert(caCert) + + serverCertChain := []tls.Certificate{ + {Certificate: [][]byte{dp.serverCert.Raw}, PrivateKey: dp.serverKey}, + {Certificate: [][]byte{caCert.Raw}}, + } + + tlsConfig := &tls.Config{ + MinVersion: tls.VersionTLS13, + ClientCAs: caCertPool, + ClientAuth: tls.RequireAndVerifyClientCert, + Certificates: serverCertChain, + VerifyPeerCertificate: func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error { + for _, verifiedChain := range verifiedChains { + for _, cert := range verifiedChain { + if dp.authority.IsRevoked(cert) { + return ErrRevokedCertificate + } + } + } + + return nil + }, + } + + tlsConn, err := tls.Listen("tcp", fmt.Sprintf(":%d", dp.proxyPort), tlsConfig) + if err != nil { + return err + } + + defer func() { + if err := tlsConn.Close(); err != nil { + log.Warn(err) + } + }() + + for { + conn, err := tlsConn.Accept() + if err != nil { + log.Error(err) + + continue + } + + go func() { + dbConn, err := net.Dial("tcp", dp.dbAddress) + if err != nil { + log.Error(err) + } + + dp.ctxMu.Lock() + + connCtx, connCancel := context.WithCancel(dp.ctx) + + dp.ctxMu.Unlock() + + cancellableConn := util.MakeCancellable(connCtx, conn) + + cancellableDBConn := util.MakeCancellable(connCtx, dbConn) + + var wg sync.WaitGroup + + wg.Add(2) + + go func() { + if _, err := io.Copy(cancellableDBConn, cancellableConn); err != nil { + log.Warn(err) + } + + if !errors.Is(err, context.Canceled) { + connCancel() + } + + wg.Done() + }() + + go func() { + if _, err := io.Copy(cancellableConn, cancellableDBConn); err != nil { + log.Warn(err) + } + + if !errors.Is(err, context.Canceled) { + connCancel() + } + + wg.Done() + }() + + wg.Wait() + + log.Info("Closing connection") + + if err := cancellableDBConn.Close(); err != nil { + log.Warn(err) + } + + if err := cancellableConn.Close(); err != nil { + log.Warn(err) + } + }() + } +} + +// CloseAll closes all existing connections. +func (dp *DatabaseProxy) CloseAll() { + log.Info("Closing all established connections") + + dp.ctxMu.Lock() + defer dp.ctxMu.Unlock() + + dp.ctxCancel() + + dp.ctx, dp.ctxCancel = context.WithCancel(context.Background()) +} diff --git a/internal/mock/sqladmin.go b/internal/mock/sqladmin.go new file mode 100644 index 0000000..6f87b93 --- /dev/null +++ b/internal/mock/sqladmin.go @@ -0,0 +1,173 @@ +package mock + +/* + * Copyright 2021 kloeckner.i GmbH + * + * 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. + */ + +import ( + "crypto/x509/pkix" + "encoding/json" + "fmt" + "net/http" + "strings" + "time" + + "github.com/gorilla/mux" + "github.com/kloeckner-i/db-auth-gateway/internal/pubkey" + "github.com/kloeckner-i/db-auth-gateway/internal/util" + log "github.com/sirupsen/logrus" + sqladmin "google.golang.org/api/sqladmin/v1beta4" +) + +/* #nosec. */ +const allowedBearerToken = "let-me-in-pls" + +// SQLAdminAPI is a mocked version of the Google sqladmin API. +type SQLAdminAPI struct { + dbProxy *DatabaseProxy + authority *pubkey.Authority + apiPort int +} + +// NewSQLAdminAPI constructs a new mocked sqladmin API. +func NewSQLAdminAPI(dbProxy *DatabaseProxy, authority *pubkey.Authority, apiPort int) (*SQLAdminAPI, error) { + return &SQLAdminAPI{dbProxy, authority, apiPort}, nil +} + +// Run runs the mocked sqladmin API. +func (sql *SQLAdminAPI) Run() error { + r := mux.NewRouter() + + r.HandleFunc("/sql/v1beta4/projects/{project}/instances/{instance}", sql.getInstanceHandler) + r.HandleFunc("/sql/v1beta4/projects/{project}/instances/{instance}/createEphemeral", sql.createEphemeralHandler) + + // Custom extension to the API for testing + r.HandleFunc("/revoke", sql.revokeCertificatesHandler) + + return http.ListenAndServe(fmt.Sprintf(":%d", sql.apiPort), r) +} + +func (sql *SQLAdminAPI) getInstanceHandler(w http.ResponseWriter, r *http.Request) { + defer func() { + if err := r.Body.Close(); err != nil { + log.Warn(err) + } + }() + + authHeader := r.Header.Get("Authorization") + if !strings.Contains(authHeader, allowedBearerToken) { + w.WriteHeader(http.StatusUnauthorized) + + return + } + + vars := mux.Vars(r) + + respBytes, err := json.Marshal(&sqladmin.DatabaseInstance{ + BackendType: "SECOND_GEN", + ConnectionName: vars["project"] + ":" + strings.ReplaceAll(vars["instance"], "~", ":"), + IpAddresses: []*sqladmin.IpMapping{ + { + IpAddress: util.GetMockAddress(), + Type: "PRIMARY", + }, + }, + ServerCaCert: &sqladmin.SslCert{ + Cert: sql.authority.CertPEM(), + }, + }) + if err != nil { + log.Error(err) + + w.WriteHeader(http.StatusInternalServerError) + + return + } + + w.WriteHeader(http.StatusOK) + + if _, err := w.Write(respBytes); err != nil { + log.Error(err) + } +} + +func (sql *SQLAdminAPI) createEphemeralHandler(w http.ResponseWriter, r *http.Request) { + defer func() { + if err := r.Body.Close(); err != nil { + log.Warn(err) + } + }() + + authHeader := r.Header.Get("Authorization") + if !strings.Contains(authHeader, allowedBearerToken) { + w.WriteHeader(http.StatusUnauthorized) + + return + } + + var createRequest sqladmin.SslCertsCreateEphemeralRequest + + if err := json.NewDecoder(r.Body).Decode(&createRequest); err != nil { + w.WriteHeader(http.StatusBadRequest) + + if _, err := w.Write([]byte(err.Error())); err != nil { + log.Error(err) + } + + return + } + + certPEM, err := sql.authority.Sign(createRequest.PublicKey, pkix.Name{ + CommonName: "ephemeral-client-certificate", + }, time.Hour) + if err != nil { + w.WriteHeader(http.StatusBadRequest) + + if _, err := w.Write([]byte(err.Error())); err != nil { + log.Error(err) + } + + return + } + + respBytes, err := json.Marshal(&sqladmin.SslCert{ + Cert: certPEM, + }) + if err != nil { + log.Error(err) + + w.WriteHeader(http.StatusInternalServerError) + + return + } + + w.WriteHeader(http.StatusOK) + + if _, err := w.Write(respBytes); err != nil { + log.Error(err) + } +} + +func (sql *SQLAdminAPI) revokeCertificatesHandler(w http.ResponseWriter, r *http.Request) { + sql.authority.RevokeAll() + + sql.dbProxy.CloseAll() + + w.WriteHeader(http.StatusOK) + + if _, err := w.Write([]byte("OK")); err != nil { + log.Error(err) + } +} diff --git a/internal/pubkey/authority.go b/internal/pubkey/authority.go new file mode 100644 index 0000000..54ed263 --- /dev/null +++ b/internal/pubkey/authority.go @@ -0,0 +1,161 @@ +package pubkey + +/* + * Copyright 2021 kloeckner.i GmbH + * + * 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. + */ + +import ( + "bytes" + "crypto/rand" + "crypto/rsa" + "crypto/x509" + "crypto/x509/pkix" + "encoding/pem" + "errors" + "math/big" + "sync" + "time" + + log "github.com/sirupsen/logrus" +) + +const minSerialNumber = 2 + +var errDecodePublicKey = errors.New("unable to decode supplied public key") + +// Authority is a local certificate authority used by the mock service that is part of the db-auth-gateway tests. +type Authority struct { + mu sync.Mutex + caKey *rsa.PrivateKey + caCert *x509.Certificate + caCertPEM string + + serialNumber int64 + issuedCerts []string + revokedCerts map[string]bool +} + +// NewAuthority constructs a new self signed certificate authority. +func NewAuthority(subject pkix.Name, ttl time.Duration) (*Authority, error) { + caCert := &x509.Certificate{ + SerialNumber: big.NewInt(1), + Subject: subject, + NotBefore: time.Now(), + NotAfter: time.Now().Add(ttl), + IsCA: true, + ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth}, + KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign, + BasicConstraintsValid: true, + } + + caKey, err := rsa.GenerateKey(rand.Reader, 2048) + if err != nil { + return nil, err + } + + caDER, err := x509.CreateCertificate(rand.Reader, caCert, caCert, &caKey.PublicKey, caKey) + if err != nil { + panic(err) + } + + caCertPEM := new(bytes.Buffer) + + if err := pem.Encode(caCertPEM, &pem.Block{ + Type: "CERTIFICATE", + Bytes: caDER, + }); err != nil { + return nil, err + } + + return &Authority{ + caKey: caKey, + caCert: caCert, + caCertPEM: caCertPEM.String(), + serialNumber: minSerialNumber, + revokedCerts: make(map[string]bool), + }, nil +} + +// CertPEM returns the PEM encoded certificate authority certificate. +func (a *Authority) CertPEM() string { + return a.caCertPEM +} + +// Sign creates a signed certificate from the supplied public key. +func (a *Authority) Sign(pubKeyPEM string, subject pkix.Name, ttl time.Duration) (string, error) { + cert := &x509.Certificate{ + SerialNumber: big.NewInt(a.serialNumber), + Subject: subject, + NotBefore: time.Now(), + NotAfter: time.Now().Add(ttl), + SubjectKeyId: []byte{1, 2, 3, 4, 6}, + ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth}, + KeyUsage: x509.KeyUsageDigitalSignature, + } + + pubKeyDER, _ := pem.Decode([]byte(pubKeyPEM)) + if pubKeyDER == nil { + return "", errDecodePublicKey + } + + pubKey, err := x509.ParsePKIXPublicKey(pubKeyDER.Bytes) + if err != nil { + return "", err + } + + certDER, err := x509.CreateCertificate(rand.Reader, cert, a.caCert, pubKey, a.caKey) + if err != nil { + return "", err + } + + a.serialNumber++ + + certPEM := new(bytes.Buffer) + + if err := pem.Encode(certPEM, &pem.Block{ + Type: "CERTIFICATE", + Bytes: certDER, + }); err != nil { + return "", err + } + + issuedCert, err := x509.ParseCertificate(certDER) + if err != nil { + return "", err + } + + a.mu.Lock() + a.issuedCerts = append(a.issuedCerts, Fingerprint(issuedCert)) + a.mu.Unlock() + + return certPEM.String(), nil +} + +// RevokeAll revokes all currently issued client certificates. +func (a *Authority) RevokeAll() { + log.Info("Revoking all client certificates") + + a.mu.Lock() + defer a.mu.Unlock() + + for _, fingerprint := range a.issuedCerts { + a.revokedCerts[fingerprint] = true + } +} + +// IsRevoked is used to check if a client certificate has been revoked. +func (a *Authority) IsRevoked(cert *x509.Certificate) bool { + return a.revokedCerts[Fingerprint(cert)] +} diff --git a/internal/pubkey/authority_test.go b/internal/pubkey/authority_test.go new file mode 100644 index 0000000..49ab3d6 --- /dev/null +++ b/internal/pubkey/authority_test.go @@ -0,0 +1,79 @@ +package pubkey_test + +/* + * Copyright 2021 kloeckner.i GmbH + * + * 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. + */ + +import ( + "crypto/rand" + "crypto/rsa" + "crypto/x509" + "crypto/x509/pkix" + "testing" + "time" + + "github.com/kloeckner-i/db-auth-gateway/internal/pubkey" + "github.com/stretchr/testify/assert" +) + +func TestAuthority(t *testing.T) { + authority, err := pubkey.NewAuthority(pkix.Name{ + CommonName: "Unit Test", + }, time.Hour) + if err != nil { + t.Fatal(err) + } + + certPEM := authority.CertPEM() + + assert.Contains(t, certPEM, "BEGIN CERTIFICATE") + + testKey, err := rsa.GenerateKey(rand.Reader, 2048) + if err != nil { + t.Fatal(err) + } + + pubKeyPEM, err := pubkey.EncodePublicKey(&testKey.PublicKey) + if err != nil { + t.Fatal(err) + } + + signedCertPEM, err := authority.Sign(pubKeyPEM, pkix.Name{ + CommonName: "unit test", + }, time.Hour) + if err != nil { + t.Fatal(err) + } + + assert.Contains(t, signedCertPEM, "BEGIN CERTIFICATE") + + caCert, err := pubkey.ParseCertificate(authority.CertPEM()) + if err != nil { + t.Fatal(err) + } + + signedCert, err := pubkey.ParseCertificate(signedCertPEM) + if err != nil { + t.Fatal(err) + } + + caCertPool := x509.NewCertPool() + caCertPool.AddCert(caCert) + + opts := x509.VerifyOptions{Roots: caCertPool} + if _, err = signedCert.Verify(opts); err != nil { + t.Fatal(err) + } +} diff --git a/internal/pubkey/pubkey.go b/internal/pubkey/pubkey.go new file mode 100644 index 0000000..48286ec --- /dev/null +++ b/internal/pubkey/pubkey.go @@ -0,0 +1,118 @@ +package pubkey + +/* + * Copyright 2015 Google Inc. All Rights Reserved. + * Copyright 2021 kloeckner.i GmbH + * + * 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. + */ + +import ( + "bytes" + "crypto/rsa" + "crypto/x509" + "encoding/pem" + "errors" + "fmt" + + "github.com/kloeckner-i/db-auth-gateway/internal/util" +) + +import "crypto/md5" // #nosec + +var ( + // ErrCommonNameMismatch is returned when the server certificate common name does not match our database. + ErrCommonNameMismatch = errors.New("certificate common name did not match") + // ErrInvalidPEM is returned when a malformed certificate is provided. + ErrInvalidPEM = errors.New("invalid pem") + // ErrNoCertificate is returned when the server does not supply a valid certificate chain. + ErrNoCertificate = errors.New("no certificate to verify") +) + +// NewServerCertificateValidator creates a new custom server certificate validator from +// the given certificate authority, and instance details. +func NewServerCertificateValidator(rootCAs *x509.CertPool, instance string) func( + rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error { + return func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error { + if len(rawCerts) == 0 { + return ErrNoCertificate + } + + cert, err := x509.ParseCertificate(rawCerts[0]) + if err != nil { + return err + } + + opts := x509.VerifyOptions{Roots: rootCAs} + if _, err = cert.Verify(opts); err != nil { + return err + } + + parsedInstance, err := util.ParseInstance(instance) + if err != nil { + return err + } + + projectName := fmt.Sprintf("%s:%s", parsedInstance["project"], parsedInstance["name"]) + if cert.Subject.CommonName != projectName { + return ErrCommonNameMismatch + } + + return nil + } +} + +// ParseCertificate decodes a PEM encoded certificate. +func ParseCertificate(certPEM string) (*x509.Certificate, error) { + bl, _ := pem.Decode([]byte(certPEM)) + if bl == nil { + return nil, ErrInvalidPEM + } + + return x509.ParseCertificate(bl.Bytes) +} + +// EncodePublicKey encodes an RSA public key into its PEM representation. +func EncodePublicKey(pubKey *rsa.PublicKey) (string, error) { + pubKeyDER, err := x509.MarshalPKIXPublicKey(pubKey) + if err != nil { + return "", err + } + + pubKeyPEM := new(bytes.Buffer) + + if err := pem.Encode(pubKeyPEM, &pem.Block{ + Type: "PUBLIC KEY", + Bytes: pubKeyDER, + }); err != nil { + return "", err + } + + return pubKeyPEM.String(), nil +} + +// Fingerprint returns the encoded fingerprint for the given certificate. +func Fingerprint(cert *x509.Certificate) string { + var fingerprint bytes.Buffer + + /* #nosec. */ + for i, v := range md5.Sum(cert.Raw) { + if i > 0 { + _, _ = fmt.Fprintf(&fingerprint, ":") + } + + _, _ = fmt.Fprintf(&fingerprint, "%02X", v) + } + + return fingerprint.String() +} diff --git a/internal/pubkey/pubkey_test.go b/internal/pubkey/pubkey_test.go new file mode 100644 index 0000000..ba18de7 --- /dev/null +++ b/internal/pubkey/pubkey_test.go @@ -0,0 +1,122 @@ +package pubkey_test + +/* + * Copyright 2021 kloeckner.i GmbH + * + * 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. + */ + +import ( + "crypto/rand" + "crypto/rsa" + "crypto/x509" + "encoding/pem" + "testing" + + "github.com/kloeckner-i/db-auth-gateway/internal/pubkey" + "github.com/stretchr/testify/assert" +) + +const serverCertPEM = `-----BEGIN CERTIFICATE----- +MIIELjCCAxagAwIBAgIUZmShyDLziQh83C+9Om9qGUtIoukwDQYJKoZIhvcNAQEL +BQAwdTELMAkGA1UEBhMCREUxEDAOBgNVBAgTB0dlcm1hbnkxDzANBgNVBAcTBkJl +cmxpbjEPMA0GA1UEChMGRGV2T3BzMRgwFgYDVQQLEw9Db25kdWl0IFRlc3QgQ0Ex +GDAWBgNVBAMTD0NvbmR1aXQgVGVzdCBDQTAeFw0yMTAyMjQxMzA3MDBaFw0zMTAy +MjUwMTA3MDBaMH0xCzAJBgNVBAYTAkRFMRAwDgYDVQQIEwdHZXJtYW55MQ8wDQYD +VQQHEwZCZXJsaW4xDzANBgNVBAoTBkRldk9wczEZMBcGA1UECxMQQ29uZHVpdCBE +YXRhYmFzZTEfMB0GA1UEAxMWbXktcHJvamVjdDpteS1kYXRhYmFzZTCCASIwDQYJ +KoZIhvcNAQEBBQADggEPADCCAQoCggEBAJykewpZJoyv9me0vLDXXMDYK9o677AP +qaqdBJvDwu05Yr/CaphYkkjrrb2xJ/ME/+Z5Nj2fmKQud5iNLeGppPT0FriYxjYp +epUa1MrOpRIfZAUS/ddhCn4bmIJJaGY8/9pBT70O9NYymga41YkWW6uqVjslfxN1 +EcPTmRvroFFDWEsDJigU6JKOOaCJUa11SsGHfsBo0xf9V6vMaAi5XlzYazaQmHd5 +k5xhhP7+gzEMEmknZv5YlEPNIJniFlilF6cedjBN6oCEWcVy1haqzMGH7/VGFHZn +bUgAOCM0eOROGnXVC7hP9GxgfK5i8C0x6ZMlAQ5gt06Ziv1F4wVc8jUCAwEAAaOB +rTCBqjAOBgNVHQ8BAf8EBAMCBaAwHQYDVR0lBBYwFAYIKwYBBQUHAwIGCCsGAQUF +BwMBMAwGA1UdEwEB/wQCMAAwHQYDVR0OBBYEFBfyPFOj4IJRH+3XFVTcg4gIPdq1 +MB8GA1UdIwQYMBaAFFKnUX7vV5f2A8Us1BmHDrS//Xy4MCsGA1UdEQQkMCKGIG15 +LXByb2plY3Q6bXktcmVnaW9uOm15LWRhdGFiYXNlMA0GCSqGSIb3DQEBCwUAA4IB +AQBKFWVVKoTiuOzUIsINqE1uTpAWwEEpUOCvyj+aTFUloHbxfluk1aUavl9Almv7 +yac9fuWgIGpM58nLdBBIdnz/VdieMpnD20Ao3vJEZ7LzLICcohidRZf1+DYUEgBG +qvPcawrAhiYI5QXKMIGhED0/tQ+b8FeijgWZ9R8/9AEcA0aHrms//V/bHsS+4H+K +ICqMbQmH3+MPpd4xSfv192jPJWwYv9+wMZweN0AD3Js24n70w3gXHBojQaIuc6DG +WD9pmGCwsGn6VuPWmVlxME0Ywp3tOAuuhC5jaM5JOW8OiHYHjmoMIxZ9PjcQbsc7 +slUrj50dVRKrPgugXlWduU/o +-----END CERTIFICATE-----` + +const caCertPEM = `-----BEGIN CERTIFICATE----- +MIIDujCCAqKgAwIBAgIUK22pJu0d3BNA50W7yza4da4lBA4wDQYJKoZIhvcNAQEL +BQAwdTELMAkGA1UEBhMCREUxEDAOBgNVBAgTB0dlcm1hbnkxDzANBgNVBAcTBkJl +cmxpbjEPMA0GA1UEChMGRGV2T3BzMRgwFgYDVQQLEw9Db25kdWl0IFRlc3QgQ0Ex +GDAWBgNVBAMTD0NvbmR1aXQgVGVzdCBDQTAeFw0yMTAyMjQxMjU0MDBaFw0yNjAy +MjMxMjU0MDBaMHUxCzAJBgNVBAYTAkRFMRAwDgYDVQQIEwdHZXJtYW55MQ8wDQYD +VQQHEwZCZXJsaW4xDzANBgNVBAoTBkRldk9wczEYMBYGA1UECxMPQ29uZHVpdCBU +ZXN0IENBMRgwFgYDVQQDEw9Db25kdWl0IFRlc3QgQ0EwggEiMA0GCSqGSIb3DQEB +AQUAA4IBDwAwggEKAoIBAQDRW+wUB2Xkn2VV2VsX6ztrQgHuV20JBb+zrd7gKUDz +pzjFUBRZ/jEBEmIPP+7TJjFrI5aVw/iYEzcw8EqN+kpg1xSM3ld9tFK/jmD98DXg +c3SJEL7QxwDMfspdqBqXtRdmSA/xl6jfspSEbP/hDeTzhib0IOIiurH1gUOCVWMA +S1AbmnJgQKvMXb+R9VKXwlb23LRH9KCR7UNKaGz/kDuJQKaBgWRLPJeddyOXuTwa +ikB6LpQyEx052pFrEcAks8OtAB2OFvPWLDzPGNxa1JXxnMKLSLZxCrnrCfc6pLsw +Y90YhKJuFG5KWzyfQXDdLR8se6jgQc5ChtcoIGR9s6oZAgMBAAGjQjBAMA4GA1Ud +DwEB/wQEAwIBBjAPBgNVHRMBAf8EBTADAQH/MB0GA1UdDgQWBBRSp1F+71eX9gPF +LNQZhw60v/18uDANBgkqhkiG9w0BAQsFAAOCAQEASAaDjzMoNEKb6OqaFPsoIIQq +lBJafueZAzjcslavSIdP4XLd+Ua8be226Cwegs4gSGwxHp6CK/ih8P5FEEUh7bYW +GJgQ4MOL1En4WFF9jeH8jgSWvmr1or8IccuKmcmHCyGVaVkbt+DFdEGpLH6USjF/ +p57SXdK8OXExFxNrc4RkC7HP04wTIZDyGQCAtZ0BprG1aK1l4VhiQdT+gj4TubDg +hfQmyMQzBMwKjae2dRciMmIPmVMc8FCk+MaRlBJ40RCjtdliICJc+r8/hRMLrzKy +h8P7/ELsOg0b3mfyOd0nfYo6uw+NMZ0HGvc1Mjv8qX6oLGulTwAeLdSAkurteg== +-----END CERTIFICATE-----` + +func TestServerCertificateValidator(t *testing.T) { + caCert, err := pubkey.ParseCertificate(caCertPEM) + if err != nil { + t.Fatal(err) + } + + encodedCert, _ := pem.Decode([]byte(serverCertPEM)) + if encodedCert == nil { + t.Fatal("unable to decode certificate") + } + + rootCAs := x509.NewCertPool() + rootCAs.AddCert(caCert) + + validator := pubkey.NewServerCertificateValidator(rootCAs, "my-project:my-region:my-database") + + err = validator([][]byte{encodedCert.Bytes}, nil) + if err != nil { + t.Fatal(err) + } +} + +func TestParseCertificate(t *testing.T) { + cert, err := pubkey.ParseCertificate(serverCertPEM) + if err != nil { + t.Fatal(err) + } + + assert.Equal(t, "my-project:my-database", cert.Subject.CommonName) +} + +func TestEncodePublicKey(t *testing.T) { + key, err := rsa.GenerateKey(rand.Reader, 2048) + if err != nil { + t.Fatal(err) + } + + pubKeyPEM, err := pubkey.EncodePublicKey(&key.PublicKey) + if err != nil { + t.Fatal(err) + } + + assert.Contains(t, pubKeyPEM, "BEGIN PUBLIC KEY") +} diff --git a/internal/util/connection.go b/internal/util/connection.go new file mode 100644 index 0000000..7b1502f --- /dev/null +++ b/internal/util/connection.go @@ -0,0 +1,126 @@ +package util + +/* + * The MIT License (MIT) + * + * Copyright (c) 2014 Juan Batiz-Benet + * Copyright (2) 2021 Kloeckner.I + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +import ( + "context" + "net" + "time" +) + +// CancellableConnection is a context.Context aware network connection. +type CancellableConnection struct { + ctx context.Context + conn net.Conn +} + +type ioret struct { + n int + err error +} + +// MakeCancellable converts a net.Conn into a cancellable connection. +func MakeCancellable(ctx context.Context, conn net.Conn) *CancellableConnection { + return &CancellableConnection{ctx, conn} +} + +// Read reads an array of bytes from the connection. +func (cc *CancellableConnection) Read(p []byte) (int, error) { + c := make(chan ioret, 1) + + buf := make([]byte, len(p)) + + performRead := func() { + n, err := cc.conn.Read(buf) + c <- ioret{n, err} + close(c) + } + + go performRead() + + select { + case ret := <-c: + copy(p, buf) + + return ret.n, ret.err + case <-cc.ctx.Done(): + return 0, cc.ctx.Err() + } +} + +// Write writes an array of bytes to the connection. +func (cc *CancellableConnection) Write(p []byte) (int, error) { + c := make(chan ioret, 1) + + buf := make([]byte, len(p)) + copy(buf, p) + + go func() { + n, err := cc.conn.Write(buf) + c <- ioret{n, err} + close(c) + }() + + select { + case r := <-c: + return r.n, r.err + case <-cc.ctx.Done(): + return 0, cc.ctx.Err() + } +} + +// Close closes the connection. +func (cc *CancellableConnection) Close() error { + return cc.conn.Close() +} + +// LocalAddr returns the local network address. +func (cc *CancellableConnection) LocalAddr() net.Addr { + return cc.conn.LocalAddr() +} + +// RemoteAddr returns the remote network address. +func (cc *CancellableConnection) RemoteAddr() net.Addr { + return cc.conn.RemoteAddr() +} + +// SetDeadline sets the read and write deadlines associated +// with the connection. +func (cc *CancellableConnection) SetDeadline(t time.Time) error { + return cc.conn.SetDeadline(t) +} + +// SetReadDeadline sets the deadline for future Read calls +// and any currently-blocked Read call. +func (cc *CancellableConnection) SetReadDeadline(t time.Time) error { + return cc.conn.SetReadDeadline(t) +} + +// SetWriteDeadline sets the deadline for future Write calls +// and any currently-blocked Write call. +func (cc *CancellableConnection) SetWriteDeadline(t time.Time) error { + return cc.conn.SetWriteDeadline(t) +} diff --git a/internal/util/util.go b/internal/util/util.go new file mode 100644 index 0000000..0df6851 --- /dev/null +++ b/internal/util/util.go @@ -0,0 +1,62 @@ +package util + +/* + * Copyright 2021 kloeckner.i GmbH + * + * 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. + */ + +import ( + "errors" + "os" + "regexp" +) + +// mockAddressEnvVar is an environment variable that can be used to set the address of the Google API mock for +// testing. If not supplied db-auth-gateway defaults to localhost. This is typically only going to be required when +// running on the Gitlab CI. +const mockAddressEnvVar = "MOCK_ADDRESS" + +// ErrInvalidDatabaseInstance is returned when a malformed database instance is supplied. +var ErrInvalidDatabaseInstance = errors.New("invalid database instance") + +// ParseInstance is used to split the components out of a fully qualified database instance. +func ParseInstance(instance string) (map[string]string, error) { + r := regexp.MustCompile(`^(?P.+):(?P.+):(?P.+)$`) + + match := r.FindStringSubmatch(instance) + + if len(match) != r.NumSubexp()+1 { + return nil, ErrInvalidDatabaseInstance + } + + parsedInstance := make(map[string]string) + + for i, name := range r.SubexpNames() { + if i != 0 && name != "" { + parsedInstance[name] = match[i] + } + } + + return parsedInstance, nil +} + +// GetMockAddress is used by the tests to determine the address of the Google API mock. +func GetMockAddress() string { + mockAddress := os.Getenv(mockAddressEnvVar) + if mockAddress == "" { + return "127.0.0.1" + } + + return mockAddress +} diff --git a/internal/util/util_test.go b/internal/util/util_test.go new file mode 100644 index 0000000..43dbd2b --- /dev/null +++ b/internal/util/util_test.go @@ -0,0 +1,48 @@ +package util_test + +/* + * Copyright 2021 kloeckner.i GmbH + * + * 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. + */ + +import ( + "testing" + + "github.com/kloeckner-i/db-auth-gateway/internal/util" + "github.com/stretchr/testify/assert" +) + +func TestParseInstance(t *testing.T) { + instance := "kloeckner-i:europe-west3:example-db" + expected := map[string]string{ + "project": "kloeckner-i", + "region": "europe-west3", + "name": "example-db", + } + + actual, err := util.ParseInstance(instance) + if err != nil { + t.Fatal(err) + } + + assert.Equal(t, expected, actual) +} + +func TestParseMalformedInstance(t *testing.T) { + instance := "kloeckner-i:europe-west3_example-db" + + _, err := util.ParseInstance(instance) + + assert.NotNil(t, err) +} diff --git a/mascot/README.md b/mascot/README.md new file mode 100644 index 0000000..47fde7b --- /dev/null +++ b/mascot/README.md @@ -0,0 +1,3 @@ +# The db-auth-gateway Mascot + +Based on [The Go Gopher](https://blog.golang.org/gopher) by [Renee French](http://reneefrench.blogspot.com/), licensed under the [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/). diff --git a/mascot/banner.png b/mascot/banner.png new file mode 100644 index 0000000..988359a Binary files /dev/null and b/mascot/banner.png differ diff --git a/mascot/transparent.png b/mascot/transparent.png new file mode 100644 index 0000000..4075516 Binary files /dev/null and b/mascot/transparent.png differ diff --git a/mascot/vector.eps b/mascot/vector.eps new file mode 100644 index 0000000..4eb36c3 Binary files /dev/null and b/mascot/vector.eps differ diff --git a/test/e2e_test.go b/test/e2e_test.go new file mode 100644 index 0000000..3125160 --- /dev/null +++ b/test/e2e_test.go @@ -0,0 +1,168 @@ +// +build e2e + +package test + +/* + * Copyright 2021 kloeckner.i GmbH + * + * 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. + */ + +import ( + "database/sql" + "errors" + "fmt" + "net" + "net/http" + "os" + "os/exec" + "path" + "testing" + "time" + + _ "github.com/jackc/pgx/v4/stdlib" + "github.com/kloeckner-i/db-auth-gateway/internal/util" + log "github.com/sirupsen/logrus" + "github.com/stretchr/testify/assert" +) + +const ( + // The port to run the proxy under test on. + gatewayPort = 5433 + gatewayStartTimeout = 5 * time.Second +) + +func TestMain(m *testing.M) { + wd, err := os.Getwd() + if err != nil { + log.Fatal(err) + } + + gatewayBinPath := path.Clean(wd + "/../target/db-auth-gateway") + + if _, err := os.Stat(gatewayBinPath); err != nil { + log.Fatal(err) + } + + gatewayHostAndPort := fmt.Sprintf("localhost:%d", gatewayPort) + + cmd := exec.Command(gatewayBinPath, + "--api-endpoint=http://"+util.GetMockAddress()+":8080", + "--credential-file=DISABLED", + "--min-refresh-interval=0", + "--listen="+gatewayHostAndPort, + "--instance=my-project:my-region:my-database") + + logFilePath := path.Clean(wd + "/../target/db-auth-gateway.log") + + logFile, err := os.OpenFile(logFilePath, os.O_CREATE|os.O_RDWR, 0o644) + if err != nil { + log.Fatal(err) + } + + cmd.Stdout = logFile + cmd.Stderr = logFile + + go func() { + if err = cmd.Start(); err != nil { + log.Fatal(err) + } + }() + + // Wait for db-auth-gateway to start. + var start time.Time + for start = time.Now(); time.Since(start) < gatewayStartTimeout; { + _, err := net.DialTimeout("tcp", gatewayHostAndPort, 100*time.Millisecond) + if err == nil { + break + } + } + + if time.Since(start) > gatewayStartTimeout { + log.Fatal("db-auth-gateway took too long to start") + } + + res := m.Run() + + if err := cmd.Process.Kill(); err != nil { + log.Warn(err) + } + + if err := logFile.Close(); err != nil { + log.Fatal(err) + } + + os.Exit(res) +} + +func TestEndToEnd(t *testing.T) { + connString := fmt.Sprintf("postgres://postgres:mysecretpassword@localhost:%d", gatewayPort) + + db, err := sql.Open("pgx", connString) + if err != nil { + t.Fatal(err) + } + + // Make the test more predictable. + db.SetMaxOpenConns(1) + + var count int64 + + err = db.QueryRow(`SELECT COUNT(*) FROM pg_catalog.pg_user`).Scan(&count) + if err != nil { + t.Fatal(err) + } + + assert.True(t, count > 0) + + // The connection pool handles a certificate rotation gracefully. + if err := rotateCertificates(); err != nil { + t.Fatal(err) + } + + count = 0 + + // The Ping will fail and the connection will be recycled from the pool. + // Unfortunately the pgx client doesn't really listen proactively for connection close events. + // https://github.com/jackc/pgx/issues/672 + err = db.Ping() + + assert.NotNil(t, err) + + err = db.QueryRow(`SELECT COUNT(*) FROM pg_catalog.pg_user`).Scan(&count) + if err != nil { + t.Fatal(err) + } + + assert.True(t, count > 0) +} + +func rotateCertificates() error { + client := &http.Client{} + + request, err := http.NewRequest(http.MethodPost, "http://"+util.GetMockAddress()+":8080/revoke", nil) + if err != nil { + return err + } + + resp, err := client.Do(request) + if err != nil { + return err + } + + if resp.StatusCode != http.StatusOK { + return errors.New("bad status code") + } + + return nil +}