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verify.go
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verify.go
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package ecspresso
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/url"
"regexp"
"strconv"
"strings"
"time"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/aws/arn"
"github.com/aws/aws-sdk-go-v2/credentials"
"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs"
cloudwatchlogsTypes "github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs/types"
"github.com/aws/aws-sdk-go-v2/service/ecr"
"github.com/aws/aws-sdk-go-v2/service/ecs"
"github.com/aws/aws-sdk-go-v2/service/ecs/types"
"github.com/aws/aws-sdk-go-v2/service/elasticloadbalancingv2"
"github.com/aws/aws-sdk-go-v2/service/iam"
"github.com/aws/aws-sdk-go-v2/service/s3"
"github.com/aws/aws-sdk-go-v2/service/secretsmanager"
"github.com/aws/aws-sdk-go-v2/service/ssm"
"github.com/aws/aws-sdk-go-v2/service/sts"
"github.com/fatih/color"
"github.com/kayac/ecspresso/v2/registry"
)
type verifier struct {
cwl *cloudwatchlogs.Client
ssm *ssm.Client
secretsmanager *secretsmanager.Client
ecr map[string]*ecr.Client
s3 *s3.Client
opt *VerifyOption
isAssumed bool
execCfg *aws.Config
}
func (v *verifier) IsAssumed() bool {
return v.isAssumed
}
func newVerifier(execCfg, appCfg *aws.Config, opt *VerifyOption) *verifier {
return &verifier{
cwl: cloudwatchlogs.NewFromConfig(*execCfg),
ssm: ssm.NewFromConfig(*execCfg),
secretsmanager: secretsmanager.NewFromConfig(*execCfg),
ecr: map[string]*ecr.Client{
execCfg.Region: ecr.NewFromConfig(*execCfg),
},
s3: s3.NewFromConfig(*appCfg),
opt: opt,
isAssumed: execCfg != appCfg,
execCfg: execCfg,
}
}
func (v *verifier) ecrClient(region string) *ecr.Client {
if c, ok := v.ecr[region]; ok {
return c
}
cfg := v.execCfg.Copy()
cfg.Region = region
client := ecr.NewFromConfig(cfg)
v.ecr[region] = client
return client
}
func (v *verifier) existsSecretValue(ctx context.Context, from string) error {
if !v.opt.GetSecrets {
return ErrSkipVerify(fmt.Sprintf("get a secret value for %s", from))
}
// secrets manager
if strings.HasPrefix(from, "arn:aws:secretsmanager:") {
// https://docs.aws.amazon.com/ja_jp/AmazonECS/latest/developerguide/specifying-sensitive-data-secrets.html
// Truncate additional params in secretsmanager Arn.
part := strings.Split(from, ":")
if len(part) < 7 {
return errors.New("invalid arn format")
}
secretArn := strings.Join(part[0:7], ":")
res, err := v.secretsmanager.GetSecretValue(ctx, &secretsmanager.GetSecretValueInput{
SecretId: &secretArn,
})
if err != nil {
return fmt.Errorf("failed to get secret value from %s secret id %s: %w", from, secretArn, err)
}
if len(part) < 8 {
return nil
}
key := part[7]
if key == "" {
return nil
}
var m map[string]interface{}
if err := json.Unmarshal([]byte(*res.SecretString), &m); err != nil {
return fmt.Errorf("failed to parse secret string from %s secret id %s: %w", from, secretArn, err)
}
if _, ok := m[key]; !ok {
return fmt.Errorf("failed to find key %s on secret json value from %s secret id %s", key, from, secretArn)
}
return nil
}
// ssm
var name string
if strings.HasPrefix(from, "arn:aws:ssm:") {
ns := strings.Split(from, ":")
name = strings.TrimPrefix(ns[len(ns)-1], "parameter")
} else {
name = from
}
out, err := v.ssm.GetParameters(ctx, &ssm.GetParametersInput{
Names: []string{name},
WithDecryption: aws.Bool(true),
})
if err != nil {
return fmt.Errorf("failed to get ssm parameters %s: %w", name, err)
}
if len(out.Parameters) == 0 || len(out.InvalidParameters) > 0 {
return fmt.Errorf("ssm parameter %s is not found", name)
}
return nil
}
func (v *verifier) existsEnvironmentFile(ctx context.Context, envFile types.EnvironmentFile) error {
if envFile.Type != types.EnvironmentFileTypeS3 {
return ErrSkipVerify("unsupported environment file type: " + string(envFile.Type))
}
s3arn := aws.ToString(envFile.Value)
a, err := arn.Parse(s3arn)
if err != nil {
return fmt.Errorf("failed to parse s3 arn %s: %w", s3arn, err)
}
if a.Service != "s3" {
return fmt.Errorf("invalid s3 arn %s", s3arn)
}
rs := strings.SplitN(a.Resource, "/", 2)
if len(rs) != 2 {
return fmt.Errorf("invalid s3 arn %s", s3arn)
}
bucket, key := rs[0], rs[1]
if _, err = v.s3.HeadObject(ctx, &s3.HeadObjectInput{
Bucket: &bucket,
Key: &key,
}); err != nil {
return fmt.Errorf("failed to head s3 object %s: %w", s3arn, err)
}
return nil
}
func (d *App) newAssumedVerifier(ctx context.Context, cfg aws.Config, executionRole *string, opt *VerifyOption) (*verifier, error) {
if executionRole == nil {
d.Log("[INFO] executionRoleArn is not set. Continue to verify with current session.")
return newVerifier(&cfg, &cfg, opt), nil
}
svc := sts.NewFromConfig(d.config.awsv2Config)
out, err := svc.AssumeRole(ctx, &sts.AssumeRoleInput{
RoleArn: executionRole,
RoleSessionName: aws.String("ecspresso-verifier"),
})
if err != nil {
d.Log("[INFO] failed to assume role to taskExecutionRole. Continue to verify with current session. %s", err.Error())
return newVerifier(&cfg, &cfg, opt), nil
}
d.Log("[INFO] success to assume role: %s", aws.ToString(executionRole))
ec := aws.Config{}
ec.Region = d.config.Region
ec.Credentials = credentials.NewStaticCredentialsProvider(
aws.ToString(out.Credentials.AccessKeyId),
aws.ToString(out.Credentials.SecretAccessKey),
aws.ToString(out.Credentials.SessionToken),
)
return newVerifier(&ec, &cfg, opt), nil
}
// VerifyOption represents options for Verify()
type VerifyOption struct {
GetSecrets bool `help:"get secrets from ParameterStore or SecretsManager" default:"true" negatable:""`
PutLogs bool `help:"put logs to CloudWatchLogs" default:"true" negatable:""`
Cache bool `help:"use cache" default:"true" negatable:""`
}
type verifyResourceFunc func(context.Context) error
// Verify verifies service / task definitions related resources are valid.
func (d *App) Verify(ctx context.Context, opt VerifyOption) error {
initVerifyState(opt.Cache)
td, err := d.LoadTaskDefinition(d.config.TaskDefinitionPath)
if err != nil {
return err
}
d.verifier, err = d.newAssumedVerifier(ctx, d.config.awsv2Config, td.ExecutionRoleArn, &opt)
if err != nil {
return err
}
ctx, cancel := d.Start(ctx)
defer cancel()
d.Log("Starting verify")
resources := []struct {
name string
fn verifyResourceFunc
}{
{name: "TaskDefinition", fn: d.verifyTaskDefinition},
{name: "ServiceDefinition", fn: d.verifyServiceDefinition},
{name: "Cluster", fn: d.verifyCluster},
}
for _, r := range resources {
if err := verifyResource(ctx, r.name, r.fn); err != nil {
return err
}
}
d.Log("Verify OK!")
return nil
}
var verifyState = struct {
cache verifyCache
level int
}{
cache: nil,
level: 0,
}
func initVerifyState(cache bool) {
if cache {
verifyState.cache = make(verifyCache, 100)
} else {
verifyState.cache = verifyCache(nil)
}
verifyState.level = 0
}
type verifyCache map[string]error
func (v verifyCache) Do(ctx context.Context, name string, fn verifyResourceFunc) (error, bool) {
if v == nil {
return fn(ctx), false
}
if err, ok := v[name]; ok {
return err, true
}
err := fn(ctx)
v[name] = err
return err, false
}
func verifyResource(ctx context.Context, name string, verifyFunc func(context.Context) error) error {
verifyState.level++
defer func() { verifyState.level-- }()
indent := strings.Repeat(" ", verifyState.level)
print := func(f string, args ...interface{}) {
fmt.Printf(indent+f+"\n", args...)
}
print("%s", name)
var cached string
verifyErr, hit := verifyState.cache.Do(ctx, name, verifyFunc)
if hit {
cached = color.CyanString("(cached)")
}
if verifyErr != nil {
if errors.As(verifyErr, &errSkipVerify) {
print("--> [%s]%s %s", color.CyanString("SKIP"), cached, color.CyanString(verifyErr.Error()))
return nil
}
print("--> [%s]%s %s", color.RedString("NG"), cached, color.RedString(verifyErr.Error()))
return fmt.Errorf("verify %s failed: %w", name, verifyErr)
}
print("--> [%s]%s", color.GreenString("OK"), cached)
return nil
}
func (d *App) verifyCluster(ctx context.Context) error {
cluster := d.config.Cluster
out, err := d.ecs.DescribeClusters(ctx, &ecs.DescribeClustersInput{
Clusters: []string{cluster},
})
if err != nil {
return fmt.Errorf("failed to describe cluster %s: %w", cluster, err)
} else if len(out.Clusters) == 0 {
return ErrNotFound(fmt.Sprintf("cluster %s is not found", cluster))
}
return nil
}
func (d *App) verifyServiceDefinition(ctx context.Context) error {
if d.config.ServiceDefinitionPath == "" {
return ErrSkipVerify("no ServiceDefinition")
}
sv, err := d.LoadServiceDefinition(d.config.ServiceDefinitionPath)
if err != nil {
return err
}
td, err := d.LoadTaskDefinition(d.config.TaskDefinitionPath)
if err != nil {
return err
}
// networkMode
if td.NetworkMode == types.NetworkModeAwsvpc {
if sv.NetworkConfiguration == nil || sv.NetworkConfiguration.AwsvpcConfiguration == nil {
return errors.New(
`networkConfiguration.awsvpcConfiguration required for the taskDefinition networkMode=awsvpc`,
)
}
}
// LB
for i, lb := range sv.LoadBalancers {
name := fmt.Sprintf("LoadBalancer[%d]", i)
err := verifyResource(ctx, name, func(context.Context) error {
out, err := d.elbv2.DescribeTargetGroups(ctx, &elasticloadbalancingv2.DescribeTargetGroupsInput{
TargetGroupArns: []string{*lb.TargetGroupArn},
})
if err != nil {
return err
} else if len(out.TargetGroups) == 0 {
return ErrNotFound(fmt.Sprintf("target group %s is not found: %s", *lb.TargetGroupArn, err))
}
cname := aws.ToString(lb.ContainerName)
cport := aws.ToInt32(lb.ContainerPort)
var container *types.ContainerDefinition
CONTAINER_DEF:
for _, c := range td.ContainerDefinitions {
if aws.ToString(c.Name) != cname {
continue
}
for _, pm := range c.PortMappings {
if aws.ToInt32(pm.ContainerPort) == cport {
container = &c
break CONTAINER_DEF
}
}
}
if container == nil {
return fmt.Errorf("container name %s and port %d is not defined in task definition", cname, cport)
}
return nil
})
if err != nil {
return err
}
}
if len(sv.LoadBalancers) == 0 && sv.HealthCheckGracePeriodSeconds != nil {
return errors.New("service has no load balancers, but healthCheckGracePeriodSeconds is defined")
}
for i, vc := range sv.VolumeConfigurations {
name := fmt.Sprintf("VolumeConfigurations[%d]", i)
err := verifyResource(ctx, name, func(context.Context) error {
if ebs := vc.ManagedEBSVolume; ebs != nil {
if len(ebs.TagSpecifications) > 1 {
d.Log("[WARNING] %s has more than one tag specifications. Only the first tag specification is used.", name)
}
}
return nil
})
if err != nil {
return err
}
}
return nil
}
func (d *App) verifyTaskDefinition(ctx context.Context) error {
td, err := d.LoadTaskDefinition(d.config.TaskDefinitionPath)
if err != nil {
return err
}
if execRole := td.ExecutionRoleArn; execRole != nil {
name := fmt.Sprintf("ExecutionRole[%s]", *execRole)
err := verifyResource(ctx, name, func(ctx context.Context) error {
return d.verifyRole(ctx, *execRole)
})
if err != nil {
return err
}
}
if taskRole := td.TaskRoleArn; taskRole != nil {
name := fmt.Sprintf("TaskRole[%s]", *taskRole)
err := verifyResource(ctx, name, func(ctx context.Context) error {
return d.verifyRole(ctx, *taskRole)
})
if err != nil {
return err
}
}
for _, c := range td.ContainerDefinitions {
name := fmt.Sprintf("ContainerDefinition[%s]", aws.ToString(c.Name))
err := verifyResource(ctx, name, func(ctx context.Context) error {
return d.verifyContainer(ctx, &c, td)
})
if err != nil {
return err
}
}
return nil
}
var (
// e.g. {aws_account_id}.dkr.ecr.{region}.amazonaws.com/amazonlinux:latest
ecrImageURLRegex = regexp.MustCompile(`^([0-9]+)\.dkr\.ecr\.([0-9a-zA-Z-]+)\.amazonaws\.com/.*`)
)
func (d *App) verifyECRImage(ctx context.Context, image, region string) error {
out, err := d.verifier.ecrClient(region).GetAuthorizationToken(
ctx,
&ecr.GetAuthorizationTokenInput{},
)
if err != nil {
return err
}
token := out.AuthorizationData[0].AuthorizationToken
return d.verifyRegistryImage(ctx, image, "AWS", aws.ToString(token))
}
func (d *App) verifyRegistryImage(ctx context.Context, image, user, password string) error {
rr := strings.SplitN(image, ":", 2)
image = rr[0]
var tag string
if len(rr) == 1 {
tag = "latest"
} else {
tag = rr[1]
}
d.Log("[DEBUG] image=%s tag=%s", image, tag)
repo := registry.New(image, user, password)
ok, err := repo.HasImage(ctx, tag)
if err != nil {
return err
}
if !ok {
return fmt.Errorf("%s:%s is not found in Registry", image, tag)
}
td, err := d.LoadTaskDefinition(d.config.TaskDefinitionPath)
if err != nil {
return err
}
// when requiredCompatibilities contain only fargate, regard as fargate task definition
isFargateTask := len(td.RequiresCompatibilities) == 1 && td.RequiresCompatibilities[0] == types.CompatibilityFargate
isFargateService, err := d.isFargateService()
if err != nil {
return err
}
arch, os := NormalizePlatform(td.RuntimePlatform, isFargateTask || isFargateService)
if arch == "" && os == "" {
return nil
}
ok, err = repo.HasPlatformImage(ctx, tag, arch, os)
if err != nil {
if errors.Is(err, registry.ErrDeprecatedManifest) || errors.Is(err, registry.ErrPullRateLimitExceeded) {
return ErrSkipVerify(err.Error())
}
return err
}
if ok {
return nil
}
return fmt.Errorf("%s:%s for arch=%s os=%s is not found in Registry", image, tag, arch, os)
}
func (d *App) isFargateService() (bool, error) {
p := d.config.ServiceDefinitionPath
if p == "" {
return false, nil
}
sv, err := d.LoadServiceDefinition(p)
if err != nil {
return false, err
}
if sv.PlatformVersion != nil && *sv.PlatformVersion != "" {
return true, nil
}
if sv.LaunchType == types.LaunchTypeFargate {
return true, nil
}
for _, s := range sv.CapacityProviderStrategy {
name := *s.CapacityProvider
if name == "FARGATE_SPOT" || name == "FARGATE" {
return true, nil
}
}
return false, nil
}
func NormalizePlatform(p *types.RuntimePlatform, isFargate bool) (arch, os string) {
// if it is able to determine a fargate resource, set fargate default platform.
// otherwise, default arch/os are empty as platform is not determined without RuntimePlatform.
if isFargate {
arch = "amd64"
os = "linux"
}
if p == nil {
return
}
// https://docs.aws.amazon.com/AmazonECS/latest/APIReference/API_RuntimePlatform.html
if p.CpuArchitecture == types.CPUArchitectureArm64 {
arch = "arm64"
} else {
arch = "amd64"
}
if p.OperatingSystemFamily == "" || p.OperatingSystemFamily == types.OSFamilyLinux {
os = "linux"
} else {
os = "windows"
}
return
}
func (d *App) verifyImage(ctx context.Context, image string) error {
if image == "" {
return errors.New("image is not defined")
}
if m := ecrImageURLRegex.FindStringSubmatch(image); len(m) == 3 {
d.Log("[DEBUG] VERIFY ECR Image %s in region %s", image, m[2])
return d.verifyECRImage(ctx, image, m[2]) // m[1] is aws account id, m[2] is region
}
d.Log("[DEBUG] VERIFY Registry Image %s", image)
return d.verifyRegistryImage(ctx, image, "", "")
}
func (d *App) verifyContainer(ctx context.Context, c *types.ContainerDefinition, td *TaskDefinitionInput) error {
image := aws.ToString(c.Image)
name := fmt.Sprintf("Image[%s]", image)
err := verifyResource(ctx, name, func(ctx context.Context) error {
return d.verifyImage(ctx, image)
})
if err != nil {
return err
}
for i, secret := range c.Secrets {
name := aws.ToString(secret.Name)
if name == "" {
return fmt.Errorf("secrets[%d] name is missing", i)
}
valueFrom := aws.ToString(secret.ValueFrom)
if valueFrom == "" {
return fmt.Errorf("secrets[%d] %s valueFrom is missing", i, name)
}
if err := verifyResource(ctx, fmt.Sprintf("Secret %s[%s]", name, valueFrom), func(ctx context.Context) error {
return d.verifier.existsSecretValue(ctx, *secret.ValueFrom)
}); err != nil {
return err
}
}
if c.LogConfiguration != nil && c.LogConfiguration.LogDriver == types.LogDriverAwslogs {
name := fmt.Sprintf("LogConfiguration[%s]", map2str(c.LogConfiguration.Options))
err := verifyResource(ctx, name, func(ctx context.Context) error {
return d.verifyLogConfiguration(ctx, c)
})
if err != nil {
return err
}
}
for _, envFile := range c.EnvironmentFiles {
name := fmt.Sprintf("EnvironmentFile[%s %s]", envFile.Type, aws.ToString(envFile.Value))
if err := verifyResource(ctx, name, func(ctx context.Context) error {
return d.verifier.existsEnvironmentFile(ctx, envFile)
}); err != nil {
return err
}
}
if td.NetworkMode == types.NetworkModeAwsvpc {
for _, pm := range c.PortMappings {
if pm.HostPort != nil && aws.ToInt32(pm.ContainerPort) != aws.ToInt32(pm.HostPort) {
return fmt.Errorf("hostPort must be same as containerPort for awsvpc networkMode")
}
}
}
return nil
}
func (d *App) verifyLogConfiguration(ctx context.Context, c *types.ContainerDefinition) error {
options := c.LogConfiguration.Options
d.Log("[DEBUG] LogConfiguration[awslogs] options=%v", options)
group, region, prefix := options["awslogs-group"], options["awslogs-region"], options["awslogs-stream-prefix"]
if group == "" {
return errors.New("awslogs-group is required")
}
if region == "" {
return errors.New("awslogs-region is required")
}
if !d.verifier.opt.PutLogs {
return ErrSkipVerify(fmt.Sprintf("putting logs to %s", group))
}
if options["awslogs-create-group"] == "true" {
if _, err := d.verifier.cwl.CreateLogGroup(ctx, &cloudwatchlogs.CreateLogGroupInput{
LogGroupName: &group,
}); err != nil {
var ex *cloudwatchlogsTypes.ResourceAlreadyExistsException
if errors.As(err, &ex) {
// ignore error if log group already exists
d.Log("[DEBUG] log group %s already exists, ignored", group)
} else if d.verifier.IsAssumed() {
return fmt.Errorf("failed to create log group %s: %w", group, err)
} else {
d.Log("[WARNING] failed to create log group %s: %s", group, err)
}
} else {
d.Log("[INFO] created log group %s", group)
}
}
var stream string
suffix := strconv.FormatInt(time.Now().UnixNano(), 10)
if prefix != "" {
stream = fmt.Sprintf("%s/%s/%s-%s", prefix, *c.Name, "ecspresso-verify", suffix)
} else {
stream = fmt.Sprintf("%s/%s-%s", *c.Name, "ecspresso-verify", suffix)
}
if _, err := d.verifier.cwl.CreateLogStream(ctx, &cloudwatchlogs.CreateLogStreamInput{
LogGroupName: &group,
LogStreamName: aws.String(stream),
}); err != nil {
return fmt.Errorf("failed to create log stream %s in %s: %w", stream, group, err)
}
if _, err := d.verifier.cwl.PutLogEvents(ctx, &cloudwatchlogs.PutLogEventsInput{
LogGroupName: &group,
LogStreamName: aws.String(stream),
LogEvents: []cloudwatchlogsTypes.InputLogEvent{
{
Message: aws.String("This is a verify message by ecspresso"),
Timestamp: aws.Int64(time.Now().Unix() * 1000),
},
},
}); err != nil {
return fmt.Errorf("failed to put log events to %s stream %s: %w", group, stream, err)
}
return nil
}
func extractRoleName(roleArn string) (string, error) {
a, err := arn.Parse(roleArn)
if err != nil {
return "", fmt.Errorf("failed to parse role arn:%s %w", roleArn, err)
}
if a.Service != "iam" {
return "", fmt.Errorf("not a valid role arn")
}
if strings.HasPrefix(a.Resource, "role/") {
rs := strings.Split(a.Resource, "/")
return rs[len(rs)-1], nil
} else {
return "", fmt.Errorf("not a valid role arn")
}
}
func (d *App) verifyRole(ctx context.Context, roleArn string) error {
roleName, err := extractRoleName(roleArn)
if err != nil {
return err
}
out, err := d.iam.GetRole(ctx, &iam.GetRoleInput{
RoleName: aws.String(roleName),
})
if err != nil {
return err
}
doc, err := parseIAMPolicyDocument(*out.Role.AssumeRolePolicyDocument)
if err != nil {
return fmt.Errorf("failed to parse IAM policy document: %w", err)
}
for _, st := range doc.Statement {
if st.Principal.Service == "ecs-tasks.amazonaws.com" && st.Action == "sts:AssumeRole" {
return nil
}
}
return fmt.Errorf("executionRole %s has not a valid policy document: %w", roleName, err)
}
type iamPolicyDocument struct {
Version string `json:"Version"`
Statement []struct {
Effect string `json:"Effect"`
Principal struct {
Service string `json:"Service"`
} `json:"Principal"`
Action string `json:"Action"`
} `json:"Statement"`
}
func parseIAMPolicyDocument(s string) (*iamPolicyDocument, error) {
var doc iamPolicyDocument
s, err := url.QueryUnescape(s)
if err != nil {
return nil, err
}
if err := json.Unmarshal([]byte(s), &doc); err != nil {
return nil, err
}
return &doc, nil
}