From 6df72e31eba3d145ed1e46c01aa46249e43f4e4d Mon Sep 17 00:00:00 2001 From: Sergey Novikov Date: Fri, 7 Jun 2019 01:39:40 +0200 Subject: [PATCH] Add Azure Key Vault provider (#6) --- .gitignore | 1 + Dockerfile | 8 +- Makefile | 4 +- README.md | 43 ++--- go.mod | 8 + go.sum | 159 +++++++++++++++++++ main.go | 11 +- provider/azurekeyvault/azurekeyvault.go | 84 ++++++++++ provider/azurekeyvault/azurekeyvault_test.go | 79 +++++++++ provider/azurekeyvault/noop.go | 6 + 10 files changed, 378 insertions(+), 25 deletions(-) create mode 100644 provider/azurekeyvault/azurekeyvault.go create mode 100644 provider/azurekeyvault/azurekeyvault_test.go create mode 100644 provider/azurekeyvault/noop.go diff --git a/.gitignore b/.gitignore index bb60ef7..1523d47 100644 --- a/.gitignore +++ b/.gitignore @@ -1,3 +1,4 @@ +azure.auth bin coverage.txt main diff --git a/Dockerfile b/Dockerfile index 8f744c6..750bccd 100644 --- a/Dockerfile +++ b/Dockerfile @@ -1,5 +1,9 @@ FROM amazonlinux:2 -COPY ./bin/exec-with-secrets-linux-amd64 /usr/local/bin/exec-with-secrets +ADD https://github.com/s12v/exec-with-secrets/releases/download/v0.3.0/exec-with-secrets-linux-amd64 /exec-with-secrets -CMD exec-with-secrets +RUN chmod +x /exec-with-secrets + +ENTRYPOINT ["/exec-with-secrets"] + +CMD env diff --git a/Makefile b/Makefile index a942957..5ea3f9c 100644 --- a/Makefile +++ b/Makefile @@ -1,6 +1,6 @@ .PHONY: all all: clean test build -TAGS = awskms awssecretsmanager awsssm +TAGS = awskms awssecretsmanager awsssm azurekeyvault clean: rm -rf ./bin || true @@ -13,4 +13,4 @@ build: GOOS=darwin GOARCH=amd64 go build -i -tags '$(TAGS)' -ldflags='-s -w' -o "bin/exec-with-secrets-darwin-amd64" docker: - docker build -t exec-with-secrets-example . + docker build --no-cache -t exec-with-secrets-example . diff --git a/README.md b/README.md index 6e739e0..8618093 100644 --- a/README.md +++ b/README.md @@ -1,48 +1,50 @@ [![Build Status](https://travis-ci.com/s12v/exec-with-secrets.svg?branch=master)](https://travis-ci.com/s12v/exec-with-secrets) [![codecov](https://codecov.io/gh/s12v/exec-with-secrets/branch/master/graph/badge.svg)](https://codecov.io/gh/s12v/exec-with-secrets) -Populate secrets from AWS KMS, SSM or Secrets Manager into your app environment +# Pass secrets from AWS KMS/SSM/Secrets Manager or Azure Key Vault into your app environment -`exec-with-secrets` passes secrets from AWS KMS, SSM, or Secrets Manager into your app environment in a secure way. - -It supports the following services as secrets providers: +`exec-with-secrets` it supports the following services as secrets providers: - [AWS Key Management (KMS)](https://aws.amazon.com/kms/) - - [AWS Systems Manager Parameter Store](https://docs.aws.amazon.com/systems-manager/latest/userguide/systems-manager-paramstore.html) + - [AWS Systems Manager Parameter Store (SSM)](https://docs.aws.amazon.com/systems-manager/latest/userguide/systems-manager-paramstore.html) - [AWS Secrets Manager](https://aws.amazon.com/secrets-manager/) + - [Azure Key Vault](https://azure.microsoft.com/en-in/services/key-vault/) This small utility looks for prefixed variables in environment and replaces them with the secret value: - `{aws-kms}AQICAHjA3mwbmf...` - decrypts the value using AWS KMS - `{aws-ssm}/app/staging/param` - loads parameter `/app/staging/param` from AWS Systems Manager Parameter Store - `{aws-sm}/app/staging/param` - loads secret `/app/staging/param` from AWS Secrets Manager - `{aws-sm}/app/staging/param{prop1}` - loads secret `/app/staging/param` from AWS Secrets Manager and takes `prop1` property + - `{az-kv}vault/name` - loads secret `name` from Azure Key Vault `vault` Then it runs `exec` system call and replaces itself with your app. The secrets are only available to your application and not accessible with `docker inspect`. -The default credentials chain is used for AWS access. +Access: + - The default credentials chain is used for AWS access + - Azure authorizer from environment variables/MSI + - Azure authorizer from configuration file, if the file is set using `AZURE_AUTH_LOCATION` variable ## Examples ### Wrap an executable ``` -PARAM="{aws-kms}AQICAHjA3mwvsfng346vnbmf..." exec-with-secrets app +# Download the latest binary +curl -L https://github.com/s12v/exec-with-secrets/releases/download/v0.3.0/exec-with-secrets-darwin-amd64 -o exec-with-secrets +chmod +x ./exec-with-secrets + +# Wrap /bin/sh +PARAM="{aws-kms}c2VjcmV0" ./exec-with-secrets /bin/sh -c 'echo $PARAM' ``` -`PARAM` will be decrypted and passed to `app` via environment. +`PARAM` will be decrypted and passed to `/bin/sh` via environment. ### Docker example -Build an image: +Build the [example Docker image](Dockerfile): ``` -FROM amazonlinux:2 - -ADD https://github.com/s12v/exec-with-secrets/releases/download/v0.3.0/exec-with-secrets-linux-amd64 /exec-with-secrets - -COPY app.jar /app.jar - -CMD exec-with-secrets java -jar /app.jar +make docker ``` Run: @@ -51,16 +53,19 @@ docker run \ -e PLAINTEXT_PARAM="text" \ -e KMS_PARAM="{aws-kms}AQICAHjA3mwvsfng346vnbmf..." \ -e SSM_PARAM="{aws-ssm}/myapp/param" \ - myappimage + exec-with-secrets-example \ + /bin/env ``` -`KMS_PARAM` and `SSM_PARAM` will be decrypted and passed to `app.jar` environment. -`docker inspect` will still see the encrypted values +`KMS_PARAM` and `SSM_PARAM` will be decrypted and passed to `/bin/env` as environment variables. + ## Build `make` builds Linux and Mac binaries with all providers. +### Choose providers + To chose providers (for example only AWS SSM), run: ``` make TAGS=awsssm diff --git a/go.mod b/go.mod index 6ddf432..8d6efef 100644 --- a/go.mod +++ b/go.mod @@ -1,3 +1,11 @@ module github.com/s12v/exec-with-secrets require github.com/aws/aws-sdk-go-v2 v0.8.0 + +require ( + github.com/Azure/azure-sdk-for-go v30.0.0+incompatible + github.com/Azure/go-autorest/autorest v0.2.0 + github.com/Azure/go-autorest/autorest/azure/auth v0.1.0 // indirect + github.com/Azure/go-autorest/autorest/to v0.2.0 // indirect + github.com/Azure/go-autorest/autorest/validation v0.1.0 // indirect +) diff --git a/go.sum b/go.sum index 1abb1ec..5252483 100644 --- a/go.sum +++ b/go.sum @@ -1,17 +1,176 @@ +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= +contrib.go.opencensus.io/exporter/ocagent v0.4.12 h1:jGFvw3l57ViIVEPKKEUXPcLYIXJmQxLUh6ey1eJhwyc= +contrib.go.opencensus.io/exporter/ocagent v0.4.12/go.mod h1:450APlNTSR6FrvC3CTRqYosuDstRB9un7SOx2k/9ckA= +github.com/Azure/azure-sdk-for-go v30.0.0+incompatible h1:6o1Yzl7wTBYg+xw0pY4qnalaPmEQolubEEdepo1/kmI= +github.com/Azure/azure-sdk-for-go v30.0.0+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc= +github.com/Azure/go-autorest/autorest v0.1.0/go.mod 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h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= diff --git a/main.go b/main.go index c6722be..c75525b 100644 --- a/main.go +++ b/main.go @@ -6,19 +6,26 @@ import ( _ "github.com/s12v/exec-with-secrets/provider/awskms" _ "github.com/s12v/exec-with-secrets/provider/awssecretsmanager" _ "github.com/s12v/exec-with-secrets/provider/awsssm" + _ "github.com/s12v/exec-with-secrets/provider/azurekeyvault" "os" "syscall" ) func main() { + defer func() { + if r := recover(); r != nil { + fmt.Println("exec-with-secrets:", r) + } + }() + if len(os.Args) < 2 { fmt.Println("Usage: exec-with-secrets program [args]") os.Exit(0) } env := provider.Populate(os.Environ()) - syscall.Exec(os.Args[1], os.Args[1:], env) + _ = syscall.Exec(os.Args[1], os.Args[1:], env) - fmt.Printf("Unable to start %v", os.Args[1]) + fmt.Println("exec-with-secrets program: Unable to start", os.Args[1]) os.Exit(1) } diff --git a/provider/azurekeyvault/azurekeyvault.go b/provider/azurekeyvault/azurekeyvault.go new file mode 100644 index 0000000..a754861 --- /dev/null +++ b/provider/azurekeyvault/azurekeyvault.go @@ -0,0 +1,84 @@ +// +build azurekeyvault + +package azurekeyvault + +import ( + "context" + "errors" + "github.com/Azure/azure-sdk-for-go/profiles/latest/keyvault/keyvault" + "github.com/Azure/azure-sdk-for-go/services/keyvault/auth" + "github.com/Azure/go-autorest/autorest" + "github.com/Azure/go-autorest/autorest/azure" + "github.com/s12v/exec-with-secrets/provider" + "os" + "strings" +) + +type KvProvider struct { + client *keyvault.BaseClient +} + +const prefix = "{az-kv}" + +var getSecret func(basicClient *keyvault.BaseClient, vaultName string, name string) (string, error) + +func init() { + getSecret = azureGetSecret + + var authorizer autorest.Authorizer + var err error + if _, exists := os.LookupEnv("AZURE_AUTH_LOCATION"); exists { + authorizer, err = auth.NewAuthorizerFromFile(azure.PublicCloud.ResourceManagerEndpoint) + } else { + authorizer, err = auth.NewAuthorizerFromEnvironment() + } + + if err != nil { + panic("unable to create Azure Key Vault authorizer: " + err.Error()) + } + + kvClient := keyvault.New() + kvClient.Authorizer = authorizer + provider.Register(&KvProvider{&kvClient}) +} + +func azureGetSecret(basicClient *keyvault.BaseClient, vaultName string, name string) (string, error) { + ctx := context.Background() + secretResp, err := basicClient.GetSecret(ctx, vaultBaseUrl(vaultName), name, "") + if err != nil { + return "", err + } + + return *secretResp.Value, nil +} + +func vaultBaseUrl(vaultName string) string { + return "https://" + vaultName + ".vault.azure.net" +} + +func (p *KvProvider) Match(val string) bool { + return strings.HasPrefix(val, prefix) && len(val) > len(prefix) && strings.Contains(val, "/") +} + +func (p *KvProvider) Decode(val string) (string, error) { + vault, name, err := splitPath(val[len(prefix):]) + + if err != nil { + return "", err + } + + if secret, err := getSecret(p.client, vault, name); err != nil { + return "", err + } else { + return secret, nil + } +} + +func splitPath(compound string) (vault string, name string, err error) { + parts := strings.Split(compound, "/") + if len(parts) != 2 { + return "", "", errors.New("invalid vault path") + } + + return parts[0], parts[1], nil +} diff --git a/provider/azurekeyvault/azurekeyvault_test.go b/provider/azurekeyvault/azurekeyvault_test.go new file mode 100644 index 0000000..b11b392 --- /dev/null +++ b/provider/azurekeyvault/azurekeyvault_test.go @@ -0,0 +1,79 @@ +// +build azurekeyvault + +package azurekeyvault + +import ( + "github.com/Azure/azure-sdk-for-go/profiles/latest/keyvault/keyvault" + "testing" +) + +func Test_SplitPath(t *testing.T) { + vault, name, err := splitPath("test-vault/test-secret") + + if err != nil { + t.Fatal("unexpected error:", err) + } + if vault != "test-vault" { + t.Fatal("unexpected vault name:", vault) + } + if name != "test-secret" { + t.Fatal("unexpected secret name:", name) + } +} + +func Test_SplitPathBadInput(t *testing.T) { + if _, _, err := splitPath("test-secret"); err == nil { + t.Fatal("expected an error") + } +} + +func Test_Match(t *testing.T) { + kvProvider := KvProvider{} + if kvProvider.Match("{az-kv}my-vaulet/my-secret") != true { + t.Fatal("expected to match") + } + + if kvProvider.Match("{az-kv}my-secret") != false { + t.Fatal("not expected to match") + } + + if kvProvider.Match("my-secret") != false { + t.Fatal("not expected to match") + } +} + +func Test_Decode(t *testing.T) { + kvProvider := KvProvider{} + getSecret = func(basicClient *keyvault.BaseClient, vaultName string, name string) (string, error) { + if vaultName != "vault1" { + t.Fatal("unexpected vault name:", vaultName) + } + + return "secretvalue", nil + } + + if r, err := kvProvider.Decode("{az-kv}vault1/bar"); r != "secretvalue" { + if err != nil { + t.Fatal("unexpected error:", err) + } + t.Fatal("unexpected plaintext:", r) + } +} + +func Test_DecodeInvalidInput(t *testing.T) { + kvProvider := KvProvider{} + r, err := kvProvider.Decode("{az-kv}some-name") + if err == nil { + t.Fatal("expected an error", r) + } + if r != "" { + t.Fatal("unexpected result:", r) + } +} + +func Test_VaultBaseName(t *testing.T) { + url := vaultBaseUrl("test1") + if url != "https://test1.vault.azure.net" { + t.Fatal("unexpected vault url:", url) + } +} diff --git a/provider/azurekeyvault/noop.go b/provider/azurekeyvault/noop.go new file mode 100644 index 0000000..675100e --- /dev/null +++ b/provider/azurekeyvault/noop.go @@ -0,0 +1,6 @@ +// +build !azurekeyvault + +package azurekeyvault + +func init() { +}