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conn.go
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conn.go
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package proxy // import "github.com/open-telemetry/opentelemetry-collector-contrib/internal/aws/proxy"
import (
"crypto/tls"
"encoding/json"
"errors"
"fmt"
"net/http"
"net/url"
"os"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/arn"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/credentials/stscreds"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/endpoints"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/sts"
"go.uber.org/zap"
)
const (
idleConnTimeout = 30 * time.Second
remoteProxyMaxIdleConnsPerHost = 2
awsRegionEnvVar = "AWS_REGION"
awsDefaultRegionEnvVar = "AWS_DEFAULT_REGION"
ecsContainerMetadataEnabledEnvVar = "ECS_ENABLE_CONTAINER_METADATA"
ecsMetadataFileEnvVar = "ECS_CONTAINER_METADATA_FILE"
httpsProxyEnvVar = "HTTPS_PROXY"
stsEndpointPrefix = "https://sts."
stsEndpointSuffix = ".amazonaws.com"
stsAwsCnPartitionIDSuffix = ".amazonaws.com.cn" // AWS China partition.
)
var newAWSSession = func(roleArn string, region string, log *zap.Logger) (*session.Session, error) {
sts := &stsCalls{log: log, getSTSCredsFromRegionEndpoint: getSTSCredsFromRegionEndpoint}
if roleArn == "" {
sess, err := session.NewSession()
if err != nil {
return nil, err
}
return sess, nil
}
stsCreds, err := sts.getCreds(region, roleArn)
if err != nil {
return nil, err
}
sess, err := session.NewSession(&aws.Config{
Credentials: stsCreds,
})
if err != nil {
return nil, err
}
return sess, nil
}
var getEC2Region = func(s *session.Session) (string, error) {
return ec2metadata.New(s).Region()
}
func getAWSConfigSession(c *Config, logger *zap.Logger) (*aws.Config, *session.Session, error) {
var (
awsRegion string
err error
)
regionEnv := os.Getenv(awsDefaultRegionEnvVar)
if regionEnv == "" {
regionEnv = os.Getenv(awsRegionEnvVar)
}
switch {
case c.Region == "" && regionEnv != "":
awsRegion = regionEnv
logger.Debug("Fetched region from environment variables", zap.String("region", awsRegion))
case c.Region != "":
awsRegion = c.Region
logger.Debug("Fetched region from config file", zap.String("region", awsRegion))
case !c.LocalMode:
awsRegion, err = getRegionFromECSMetadata()
if err != nil {
logger.Debug("Unable to fetch region from ECS metadata", zap.Error(err))
var sess *session.Session
sess, err = session.NewSession()
if err == nil {
awsRegion, err = getEC2Region(sess)
if err != nil {
logger.Debug("Unable to fetch region from EC2 metadata", zap.Error(err))
} else {
logger.Debug("Fetched region from EC2 metadata", zap.String("region", awsRegion))
}
}
} else {
logger.Debug("Fetched region from ECS metadata file", zap.String("region", awsRegion))
}
}
if err != nil {
return nil, nil, fmt.Errorf("could not fetch region from config file, environment variables, ecs metadata, or ec2 metadata: %w", err)
}
sess, err := newAWSSession(c.RoleARN, awsRegion, logger)
if err != nil {
return nil, nil, err
}
return &aws.Config{
Region: aws.String(awsRegion),
DisableParamValidation: aws.Bool(true),
MaxRetries: aws.Int(2),
Endpoint: aws.String(c.AWSEndpoint),
CredentialsChainVerboseErrors: aws.Bool(true),
}, sess, nil
}
func getProxyAddress(proxyAddress string) string {
if proxyAddress != "" {
return proxyAddress
}
if os.Getenv(httpsProxyEnvVar) != "" {
return os.Getenv(httpsProxyEnvVar)
}
return ""
}
func getProxyURL(proxyAddress string) (*url.URL, error) {
var proxyURL *url.URL
var err error
if proxyAddress != "" {
proxyURL, err = url.Parse(proxyAddress)
if err != nil {
return nil, fmt.Errorf("failed to parse proxy URL: %w", err)
}
return proxyURL, nil
}
return nil, nil
}
func getRegionFromECSMetadata() (string, error) {
ecsMetadataEnabled := os.Getenv(ecsContainerMetadataEnabledEnvVar)
ecsMetadataEnabled = strings.ToLower(ecsMetadataEnabled)
if ecsMetadataEnabled == "true" {
metadataFilePath := os.Getenv(ecsMetadataFileEnvVar)
metadata, err := os.ReadFile(metadataFilePath)
if err != nil {
return "", fmt.Errorf("unable to open ECS metadata file, path: %s, error: %w",
metadataFilePath, err)
}
var dat map[string]any
err = json.Unmarshal(metadata, &dat)
if err != nil {
return "", fmt.Errorf("invalid json in read ECS metadata file content, path: %s, error: %w",
metadataFilePath, err)
}
taskArn, err := arn.Parse(dat["TaskARN"].(string))
if err != nil {
return "", err
}
return taskArn.Region, nil
}
return "", errors.New("ECS metadata endpoint is inaccessible")
}
// proxyServerTransport configures HTTP transport for TCP Proxy Server.
func proxyServerTransport(config *Config) (*http.Transport, error) {
tls := &tls.Config{
InsecureSkipVerify: config.TLSSetting.Insecure,
}
proxyAddr := getProxyAddress(config.ProxyAddress)
proxyURL, err := getProxyURL(proxyAddr)
if err != nil {
return nil, err
}
return &http.Transport{
MaxIdleConnsPerHost: remoteProxyMaxIdleConnsPerHost,
IdleConnTimeout: idleConnTimeout,
Proxy: http.ProxyURL(proxyURL),
TLSClientConfig: tls,
// If not disabled the transport will add a gzip encoding header
// to requests with no `accept-encoding` header value. The header
// is added after we sign the request which invalidates the
// signature.
DisableCompression: true,
}, nil
}
type stsCalls struct {
log *zap.Logger
getSTSCredsFromRegionEndpoint func(log *zap.Logger, sess *session.Session, region, roleArn string) *credentials.Credentials
}
// getSTSCreds gets STS credentials first from the regional endpoint, then from the primary
// region in the respective AWS partition if the regional endpoint is disabled.
func (s *stsCalls) getCreds(region string, roleArn string) (*credentials.Credentials, error) {
sess, err := session.NewSession()
if err != nil {
return nil, err
}
stsCred := s.getSTSCredsFromRegionEndpoint(s.log, sess, region, roleArn)
// Make explicit call to fetch credentials.
_, err = stsCred.Get()
if err != nil {
var awsErr awserr.Error
if errors.As(err, &awsErr) {
switch awsErr.Code() {
case sts.ErrCodeRegionDisabledException:
s.log.Warn("STS regional endpoint disabled. Credentials for provided RoleARN will be fetched from STS primary region endpoint instead",
zap.String("region", region), zap.Error(awsErr))
stsCred, err = s.getSTSCredsFromPrimaryRegionEndpoint(sess, roleArn, region)
default:
return nil, fmt.Errorf("unable to handle AWS error: %w", awsErr)
}
}
}
return stsCred, err
}
// getSTSCredsFromRegionEndpoint fetches STS credentials for provided roleARN from regional endpoint.
// AWS STS recommends that you provide both the Region and endpoint when you make calls to a Regional endpoint.
// Reference: https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_temp_enable-regions.html#id_credentials_temp_enable-regions_writing_code
var getSTSCredsFromRegionEndpoint = func(log *zap.Logger, sess *session.Session, region string, roleArn string) *credentials.Credentials {
regionalEndpoint := getSTSRegionalEndpoint(region)
// if regionalEndpoint is "", the STS endpoint is Global endpoint for classic regions except ap-east-1 - (HKG)
// for other opt-in regions, region value will create STS regional endpoint.
// This will only be the case if the provided region is not present in aws_regions.go
c := &aws.Config{Region: aws.String(region), Endpoint: ®ionalEndpoint}
st := sts.New(sess, c)
log.Info("STS endpoint to use", zap.String("endpoint", st.Endpoint))
return stscreds.NewCredentialsWithClient(st, roleArn)
}
// getSTSCredsFromPrimaryRegionEndpoint fetches STS credentials for provided roleARN from primary region endpoint in the
// respective partition.
func (s *stsCalls) getSTSCredsFromPrimaryRegionEndpoint(sess *session.Session, roleArn string, region string) (*credentials.Credentials, error) {
partitionID := getPartition(region)
switch partitionID {
case endpoints.AwsPartitionID:
return s.getSTSCredsFromRegionEndpoint(s.log, sess, endpoints.UsEast1RegionID, roleArn), nil
case endpoints.AwsCnPartitionID:
return s.getSTSCredsFromRegionEndpoint(s.log, sess, endpoints.CnNorth1RegionID, roleArn), nil
case endpoints.AwsUsGovPartitionID:
return s.getSTSCredsFromRegionEndpoint(s.log, sess, endpoints.UsGovWest1RegionID, roleArn), nil
default:
return nil, fmt.Errorf("unrecognized AWS region: %s, or partition: %s", region, partitionID)
}
}
func getSTSRegionalEndpoint(r string) string {
p := getPartition(r)
var e string
if p == endpoints.AwsPartitionID || p == endpoints.AwsUsGovPartitionID {
e = stsEndpointPrefix + r + stsEndpointSuffix
} else if p == endpoints.AwsCnPartitionID {
e = stsEndpointPrefix + r + stsAwsCnPartitionIDSuffix
}
return e
}
// getPartition returns the AWS Partition for the provided region.
func getPartition(region string) string {
p, _ := endpoints.PartitionForRegion(endpoints.DefaultPartitions(), region)
return p.ID()
}