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Adds webIndentity token for aws (#1099)
https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1080
This commit is contained in:
Nikolay
GitHub
parent
937f382938
commit
f6114345de
@ -18,13 +18,17 @@ import (
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const (
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awsAccessKeyEnv = "AWS_ACCESS_KEY_ID"
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awsSecretKeyEnv = "AWS_SECRET_ACCESS_KEY"
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awsRegionEnv = "AWS_REGION"
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awsRoleARNEnv = "AWS_ROLE_ARN"
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awsWITPath = "AWS_WEB_IDENTITY_TOKEN_FILE"
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)
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type apiConfig struct {
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region string
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roleARN string
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filters string
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port int
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region string
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roleARN string
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webTokenPath string
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filters string
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port int
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ec2Endpoint string
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stsEndpoint string
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@ -79,6 +83,14 @@ func newAPIConfig(sdc *SDConfig) (*apiConfig, error) {
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cfg.ec2Endpoint = buildAPIEndpoint(sdc.Endpoint, region, "ec2")
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cfg.stsEndpoint = buildAPIEndpoint(sdc.Endpoint, region, "sts")
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envARN := os.Getenv(awsRoleARNEnv)
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if envARN != "" {
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cfg.roleARN = envARN
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}
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cfg.webTokenPath = os.Getenv(awsWITPath)
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if cfg.webTokenPath != "" && cfg.roleARN == "" {
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return nil, fmt.Errorf("roleARN is missing for %q, set it with cfg or env var %q", awsWITPath, awsRoleARNEnv)
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}
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// explicitly set credentials has priority over env variables
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cfg.defaultAccessKey = os.Getenv(awsAccessKeyEnv)
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cfg.defaultSecretKey = os.Getenv(awsSecretKeyEnv)
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@ -108,6 +120,11 @@ func getFiltersQueryString(filters []Filter) string {
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}
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func getDefaultRegion() (string, error) {
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envRegion := os.Getenv(awsRegionEnv)
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if envRegion != "" {
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return envRegion, nil
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}
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data, err := getMetadataByPath("dynamic/instance-identity/document")
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if err != nil {
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return "", err
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@ -156,6 +173,13 @@ func getAPICredentials(cfg *apiConfig) (*apiCredentials, error) {
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AccessKeyID: cfg.defaultAccessKey,
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SecretAccessKey: cfg.defaultSecretKey,
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}
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if len(cfg.webTokenPath) > 0 {
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token, err := ioutil.ReadFile(cfg.webTokenPath)
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if err != nil {
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return nil, fmt.Errorf("cannot read webToken from path: %q, err: %w", cfg.webTokenPath, err)
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}
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return getRoleWebIdentityCredentials(cfg.stsEndpoint, cfg.roleARN, string(token))
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}
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// we need instance credentials if dont have access keys
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if len(acNew.AccessKeyID) == 0 && len(acNew.SecretAccessKey) == 0 {
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@ -263,42 +287,73 @@ func getMetadataByPath(apiPath string) ([]byte, error) {
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return readResponseBody(resp, apiURL)
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}
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// getRoleARNCredentials obtains credentials fo the given roleARN.
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func getRoleARNCredentials(region, stsEndpoint, roleARN string, creds *apiCredentials) (*apiCredentials, error) {
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data, err := getSTSAPIResponse(region, stsEndpoint, roleARN, creds)
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// getRoleWebIdentityCredentials obtains credentials fo the given roleARN with webToken.
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// https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRoleWithWebIdentity.html
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// aws IRSA for kubernetes.
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// https://aws.amazon.com/blogs/opensource/introducing-fine-grained-iam-roles-service-accounts/
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func getRoleWebIdentityCredentials(stsEndpoint, roleARN string, token string) (*apiCredentials, error) {
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data, err := getSTSAPIResponse("AssumeRoleWithWebIdentity", stsEndpoint, roleARN, func(apiURL string) (*http.Request, error) {
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apiURL += fmt.Sprintf("&WebIdentityToken=%s", token)
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return http.NewRequest("GET", apiURL, nil)
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})
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if err != nil {
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return nil, err
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}
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return parseARNCredentials(data)
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return parseARNCredentials(data, "AssumeRoleWithWebIdentity")
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}
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// getRoleARNCredentials obtains credentials fo the given roleARN.
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func getRoleARNCredentials(region, stsEndpoint, roleARN string, creds *apiCredentials) (*apiCredentials, error) {
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data, err := getSTSAPIResponse("AssumeRole", stsEndpoint, roleARN, func(apiURL string) (*http.Request, error) {
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return newSignedRequest(apiURL, "sts", region, creds)
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})
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if err != nil {
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return nil, err
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}
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return parseARNCredentials(data, "AssumeRole")
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}
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// parseARNCredentials parses apiCredentials from AssumeRole response.
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//
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// See https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html
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func parseARNCredentials(data []byte) (*apiCredentials, error) {
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func parseARNCredentials(data []byte, role string) (*apiCredentials, error) {
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var arr AssumeRoleResponse
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if err := xml.Unmarshal(data, &arr); err != nil {
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return nil, fmt.Errorf("cannot parse AssumeRoleResponse response from %q: %w", data, err)
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}
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var cred assumeCredentials
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switch role {
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case "AssumeRole":
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cred = arr.AssumeRoleResult.Credentials
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case "AssumeRoleWithWebIdentity":
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cred = arr.AssumeRoleWithWebIdentityResult.Credentials
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default:
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return nil, fmt.Errorf("bug, unexpected role: %q", role)
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}
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return &apiCredentials{
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AccessKeyID: arr.AssumeRoleResult.Credentials.AccessKeyID,
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SecretAccessKey: arr.AssumeRoleResult.Credentials.SecretAccessKey,
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Token: arr.AssumeRoleResult.Credentials.SessionToken,
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Expiration: arr.AssumeRoleResult.Credentials.Expiration,
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AccessKeyID: cred.AccessKeyID,
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SecretAccessKey: cred.SecretAccessKey,
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Token: cred.SessionToken,
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Expiration: cred.Expiration,
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}, nil
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}
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type assumeCredentials struct {
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AccessKeyID string `xml:"AccessKeyId"`
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SecretAccessKey string `xml:"SecretAccessKey"`
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SessionToken string `xml:"SessionToken"`
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Expiration time.Time `xml:"Expiration"`
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}
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// AssumeRoleResponse represents AssumeRole response
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//
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// See https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html
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type AssumeRoleResponse struct {
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AssumeRoleResult struct {
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Credentials struct {
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AccessKeyID string `xml:"AccessKeyId"`
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SecretAccessKey string `xml:"SecretAccessKey"`
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SessionToken string `xml:"SessionToken"`
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Expiration time.Time `xml:"Expiration"`
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}
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Credentials assumeCredentials
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}
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AssumeRoleWithWebIdentityResult struct {
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Credentials assumeCredentials
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}
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}
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@ -323,14 +378,14 @@ func buildAPIEndpoint(customEndpoint, region, service string) string {
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// and returns temporary credentials with expiration time
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//
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// See https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html
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func getSTSAPIResponse(region, stsEndpoint, roleARN string, creds *apiCredentials) ([]byte, error) {
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func getSTSAPIResponse(action, stsEndpoint, roleARN string, reqBuilder func(apiURL string) (*http.Request, error)) ([]byte, error) {
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// See https://docs.aws.amazon.com/AWSEC2/latest/APIReference/Query-Requests.html
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apiURL := fmt.Sprintf("%s?Action=%s", stsEndpoint, "AssumeRole")
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apiURL := fmt.Sprintf("%s?Action=%s", stsEndpoint, action)
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apiURL += "&Version=2011-06-15"
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apiURL += fmt.Sprintf("&RoleArn=%s", roleARN)
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// we have to provide unique session name for cloudtrail audit
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apiURL += "&RoleSessionName=vmagent-ec2-discovery"
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req, err := newSignedRequest(apiURL, "sts", region, creds)
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req, err := reqBuilder(apiURL)
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if err != nil {
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return nil, fmt.Errorf("cannot create signed request: %w", err)
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}
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@ -51,7 +51,7 @@ func TestParseMetadataSecurityCredentialsSuccess(t *testing.T) {
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func TestParseARNCredentialsFailure(t *testing.T) {
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f := func(s string) {
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t.Helper()
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creds, err := parseARNCredentials([]byte(s))
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creds, err := parseARNCredentials([]byte(s), "")
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if err == nil {
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t.Fatalf("expecting non-nil error")
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}
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@ -64,6 +64,19 @@ func TestParseARNCredentialsFailure(t *testing.T) {
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}
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func TestParseARNCredentialsSuccess(t *testing.T) {
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f := func(data, role string, credsExpected *apiCredentials) {
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t.Helper()
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creds, err := parseARNCredentials([]byte(data), role)
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if err != nil {
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t.Fatalf("unexpected error: %s", err)
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}
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if !reflect.DeepEqual(creds, credsExpected) {
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t.Fatalf("unexpected creds;\ngot\n%+v\nwant\n%+v", creds, credsExpected)
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}
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}
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// See https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html
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s := `<AssumeRoleResponse xmlns="https://sts.amazonaws.com/doc/2011-06-15/">
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<AssumeRoleResult>
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@ -90,10 +103,6 @@ func TestParseARNCredentialsSuccess(t *testing.T) {
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</ResponseMetadata>
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</AssumeRoleResponse>
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`
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creds, err := parseARNCredentials([]byte(s))
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if err != nil {
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t.Fatalf("unexpected error: %s", err)
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}
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credsExpected := &apiCredentials{
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AccessKeyID: "ASIAIOSFODNN7EXAMPLE",
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SecretAccessKey: "wJalrXUtnFEMI/K7MDENG/bPxRfiCYzEXAMPLEKEY",
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@ -106,9 +115,35 @@ func TestParseARNCredentialsSuccess(t *testing.T) {
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`,
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Expiration: mustParseRFC3339("2019-11-09T13:34:41Z"),
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}
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if !reflect.DeepEqual(creds, credsExpected) {
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t.Fatalf("unexpected creds;\ngot\n%+v\nwant\n%+v", creds, credsExpected)
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s2 := `<AssumeRoleWithWebIdentityResponse xmlns="https://sts.amazonaws.com/doc/2011-06-15/">
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<AssumeRoleWithWebIdentityResult>
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<Audience>sts.amazonaws.com</Audience>
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<AssumedRoleUser>
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<AssumedRoleId>AROA2X6NOXN27E3OGMK3T:vmagent-ec2-discovery</AssumedRoleId>
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<Arn>arn:aws:sts::111111111:assumed-role/eks-role-9N0EFKEDJ1X/vmagent-ec2-discovery</Arn>
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</AssumedRoleUser>
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<Provider>arn:aws:iam::111111111:oidc-provider/oidc.eks.eu-west-1.amazonaws.com/id/111111111</Provider>
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<Credentials>
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<AccessKeyId>ASIABYASSDASF</AccessKeyId>
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<SecretAccessKey>asffasfasf/RvxIQpCid4iRMGm56nnRs2oKgV</SecretAccessKey>
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<SessionToken>asfafsassssssssss/MlyKUPOYAiEAq5HgS19Mf8SJ3kIKU3NCztDeZW5EUW4NrPrPyXQ8om0q/AQIjv//////////</SessionToken>
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<Expiration>2021-03-01T13:38:15Z</Expiration>
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</Credentials>
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<SubjectFromWebIdentityToken>system:serviceaccount:default:vmagent</SubjectFromWebIdentityToken>
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</AssumeRoleWithWebIdentityResult>
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<ResponseMetadata>
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<RequestId>1214124-7bb0-4673-ad6d-af9e67fc1141</RequestId>
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</ResponseMetadata>
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</AssumeRoleWithWebIdentityResponse>`
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credsExpected2 := &apiCredentials{
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AccessKeyID: "ASIABYASSDASF",
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SecretAccessKey: "asffasfasf/RvxIQpCid4iRMGm56nnRs2oKgV",
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Token: "asfafsassssssssss/MlyKUPOYAiEAq5HgS19Mf8SJ3kIKU3NCztDeZW5EUW4NrPrPyXQ8om0q/AQIjv//////////",
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Expiration: mustParseRFC3339("2021-03-01T13:38:15Z"),
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}
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f(s, "AssumeRole", credsExpected)
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f(s2, "AssumeRoleWithWebIdentity", credsExpected2)
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}
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func mustParseRFC3339(s string) time.Time {
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