terraform/builtin/providers/aws/config.go

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package aws
import (
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"fmt"
"log"
"net/http"
"os"
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"strings"
"time"
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"github.com/hashicorp/go-cleanhttp"
"github.com/hashicorp/go-multierror"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
awsCredentials "github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/credentials/ec2rolecreds"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/autoscaling"
"github.com/aws/aws-sdk-go/service/cloudformation"
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"github.com/aws/aws-sdk-go/service/cloudtrail"
"github.com/aws/aws-sdk-go/service/cloudwatch"
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"github.com/aws/aws-sdk-go/service/cloudwatchlogs"
"github.com/aws/aws-sdk-go/service/codecommit"
"github.com/aws/aws-sdk-go/service/codedeploy"
"github.com/aws/aws-sdk-go/service/directoryservice"
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"github.com/aws/aws-sdk-go/service/dynamodb"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/aws/aws-sdk-go/service/ecr"
"github.com/aws/aws-sdk-go/service/ecs"
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"github.com/aws/aws-sdk-go/service/efs"
"github.com/aws/aws-sdk-go/service/elasticache"
elasticsearch "github.com/aws/aws-sdk-go/service/elasticsearchservice"
"github.com/aws/aws-sdk-go/service/elb"
"github.com/aws/aws-sdk-go/service/firehose"
"github.com/aws/aws-sdk-go/service/glacier"
"github.com/aws/aws-sdk-go/service/iam"
"github.com/aws/aws-sdk-go/service/kinesis"
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"github.com/aws/aws-sdk-go/service/lambda"
"github.com/aws/aws-sdk-go/service/opsworks"
"github.com/aws/aws-sdk-go/service/rds"
"github.com/aws/aws-sdk-go/service/redshift"
"github.com/aws/aws-sdk-go/service/route53"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/sns"
"github.com/aws/aws-sdk-go/service/sqs"
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)
type Config struct {
AccessKey string
SecretKey string
CredsFilename string
Profile string
Token string
Region string
MaxRetries int
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AllowedAccountIds []interface{}
ForbiddenAccountIds []interface{}
DynamoDBEndpoint string
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KinesisEndpoint string
}
type AWSClient struct {
cfconn *cloudformation.CloudFormation
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cloudtrailconn *cloudtrail.CloudTrail
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cloudwatchconn *cloudwatch.CloudWatch
cloudwatchlogsconn *cloudwatchlogs.CloudWatchLogs
dsconn *directoryservice.DirectoryService
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dynamodbconn *dynamodb.DynamoDB
ec2conn *ec2.EC2
ecrconn *ecr.ECR
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ecsconn *ecs.ECS
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efsconn *efs.EFS
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elbconn *elb.ELB
esconn *elasticsearch.ElasticsearchService
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autoscalingconn *autoscaling.AutoScaling
s3conn *s3.S3
sqsconn *sqs.SQS
snsconn *sns.SNS
redshiftconn *redshift.Redshift
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r53conn *route53.Route53
region string
rdsconn *rds.RDS
iamconn *iam.IAM
kinesisconn *kinesis.Kinesis
firehoseconn *firehose.Firehose
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elasticacheconn *elasticache.ElastiCache
lambdaconn *lambda.Lambda
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opsworksconn *opsworks.OpsWorks
glacierconn *glacier.Glacier
codedeployconn *codedeploy.CodeDeploy
codecommitconn *codecommit.CodeCommit
}
// Client configures and returns a fully initialized AWSClient
func (c *Config) Client() (interface{}, error) {
var client AWSClient
// Get the auth and region. This can fail if keys/regions were not
// specified and we're attempting to use the environment.
var errs []error
log.Println("[INFO] Building AWS region structure")
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err := c.ValidateRegion()
if err != nil {
errs = append(errs, err)
}
if len(errs) == 0 {
// store AWS region in client struct, for region specific operations such as
// bucket storage in S3
client.region = c.Region
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log.Println("[INFO] Building AWS auth structure")
creds := getCreds(c.AccessKey, c.SecretKey, c.Token, c.Profile, c.CredsFilename)
// Call Get to check for credential provider. If nothing found, we'll get an
// error, and we can present it nicely to the user
_, err = creds.Get()
if err != nil {
errs = append(errs, fmt.Errorf("Error loading credentials for AWS Provider: %s", err))
return nil, &multierror.Error{Errors: errs}
}
awsConfig := &aws.Config{
Credentials: creds,
Region: aws.String(c.Region),
MaxRetries: aws.Int(c.MaxRetries),
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HTTPClient: cleanhttp.DefaultClient(),
}
log.Println("[INFO] Initializing IAM Connection")
sess := session.New(awsConfig)
client.iamconn = iam.New(sess)
err = c.ValidateCredentials(client.iamconn)
if err != nil {
errs = append(errs, err)
}
// Some services exist only in us-east-1, e.g. because they manage
// resources that can span across multiple regions, or because
// signature format v4 requires region to be us-east-1 for global
// endpoints:
// http://docs.aws.amazon.com/general/latest/gr/sigv4_changes.html
usEast1AwsConfig := &aws.Config{
Credentials: creds,
Region: aws.String("us-east-1"),
MaxRetries: aws.Int(c.MaxRetries),
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HTTPClient: cleanhttp.DefaultClient(),
}
usEast1Sess := session.New(usEast1AwsConfig)
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awsDynamoDBConfig := *awsConfig
awsDynamoDBConfig.Endpoint = aws.String(c.DynamoDBEndpoint)
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log.Println("[INFO] Initializing DynamoDB connection")
dynamoSess := session.New(&awsDynamoDBConfig)
client.dynamodbconn = dynamodb.New(dynamoSess)
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log.Println("[INFO] Initializing ELB connection")
client.elbconn = elb.New(sess)
log.Println("[INFO] Initializing S3 connection")
client.s3conn = s3.New(sess)
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log.Println("[INFO] Initializing SQS connection")
client.sqsconn = sqs.New(sess)
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log.Println("[INFO] Initializing SNS connection")
client.snsconn = sns.New(sess)
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log.Println("[INFO] Initializing RDS Connection")
client.rdsconn = rds.New(sess)
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awsKinesisConfig := *awsConfig
awsKinesisConfig.Endpoint = aws.String(c.KinesisEndpoint)
log.Println("[INFO] Initializing Kinesis Connection")
kinesisSess := session.New(&awsKinesisConfig)
client.kinesisconn = kinesis.New(kinesisSess)
authErr := c.ValidateAccountId(client.iamconn)
if authErr != nil {
errs = append(errs, authErr)
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}
log.Println("[INFO] Initializing Kinesis Firehose Connection")
client.firehoseconn = firehose.New(sess)
log.Println("[INFO] Initializing AutoScaling connection")
client.autoscalingconn = autoscaling.New(sess)
log.Println("[INFO] Initializing EC2 Connection")
client.ec2conn = ec2.New(sess)
log.Println("[INFO] Initializing ECR Connection")
client.ecrconn = ecr.New(sess)
log.Println("[INFO] Initializing ECS Connection")
client.ecsconn = ecs.New(sess)
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log.Println("[INFO] Initializing EFS Connection")
client.efsconn = efs.New(sess)
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log.Println("[INFO] Initializing ElasticSearch Connection")
client.esconn = elasticsearch.New(sess)
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log.Println("[INFO] Initializing Route 53 connection")
client.r53conn = route53.New(usEast1Sess)
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log.Println("[INFO] Initializing Elasticache Connection")
client.elasticacheconn = elasticache.New(sess)
log.Println("[INFO] Initializing Lambda Connection")
client.lambdaconn = lambda.New(sess)
log.Println("[INFO] Initializing Cloudformation Connection")
client.cfconn = cloudformation.New(sess)
log.Println("[INFO] Initializing CloudWatch SDK connection")
client.cloudwatchconn = cloudwatch.New(sess)
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log.Println("[INFO] Initializing CloudTrail connection")
client.cloudtrailconn = cloudtrail.New(sess)
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log.Println("[INFO] Initializing CloudWatch Logs connection")
client.cloudwatchlogsconn = cloudwatchlogs.New(sess)
log.Println("[INFO] Initializing OpsWorks Connection")
client.opsworksconn = opsworks.New(usEast1Sess)
log.Println("[INFO] Initializing Directory Service connection")
client.dsconn = directoryservice.New(sess)
log.Println("[INFO] Initializing Glacier connection")
client.glacierconn = glacier.New(sess)
log.Println("[INFO] Initializing CodeDeploy Connection")
client.codedeployconn = codedeploy.New(sess)
log.Println("[INFO] Initializing CodeCommit SDK connection")
client.codecommitconn = codecommit.New(usEast1Sess)
log.Println("[INFO] Initializing Redshift SDK connection")
client.redshiftconn = redshift.New(sess)
}
if len(errs) > 0 {
return nil, &multierror.Error{Errors: errs}
}
return &client, nil
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}
// ValidateRegion returns an error if the configured region is not a
// valid aws region and nil otherwise.
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func (c *Config) ValidateRegion() error {
var regions = [12]string{"us-east-1", "us-west-2", "us-west-1", "eu-west-1",
"eu-central-1", "ap-southeast-1", "ap-southeast-2", "ap-northeast-1",
"ap-northeast-2", "sa-east-1", "cn-north-1", "us-gov-west-1"}
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for _, valid := range regions {
if c.Region == valid {
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return nil
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}
}
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return fmt.Errorf("Not a valid region: %s", c.Region)
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}
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// Validate credentials early and fail before we do any graph walking.
// In the case of an IAM role/profile with insuffecient privileges, fail
// silently
func (c *Config) ValidateCredentials(iamconn *iam.IAM) error {
_, err := iamconn.GetUser(nil)
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if awsErr, ok := err.(awserr.Error); ok {
if awsErr.Code() == "AccessDenied" || awsErr.Code() == "ValidationError" {
log.Printf("[WARN] AccessDenied Error with iam.GetUser, assuming IAM profile")
// User may be an IAM instance profile, or otherwise IAM role without the
// GetUser permissions, so fail silently
return nil
}
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if awsErr.Code() == "SignatureDoesNotMatch" {
return fmt.Errorf("Failed authenticating with AWS: please verify credentials")
}
}
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return err
}
// ValidateAccountId returns a context-specific error if the configured account
// id is explicitly forbidden or not authorised; and nil if it is authorised.
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func (c *Config) ValidateAccountId(iamconn *iam.IAM) error {
if c.AllowedAccountIds == nil && c.ForbiddenAccountIds == nil {
return nil
}
log.Printf("[INFO] Validating account ID")
out, err := iamconn.GetUser(nil)
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if err != nil {
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awsErr, _ := err.(awserr.Error)
if awsErr.Code() == "ValidationError" {
log.Printf("[WARN] ValidationError with iam.GetUser, assuming its an IAM profile")
// User may be an IAM instance profile, so fail silently.
// If it is an IAM instance profile
// validating account might be superfluous
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return nil
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} else {
return fmt.Errorf("Failed getting account ID from IAM: %s", err)
// return error if the account id is explicitly not authorised
}
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}
account_id := strings.Split(*out.User.Arn, ":")[4]
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if c.ForbiddenAccountIds != nil {
for _, id := range c.ForbiddenAccountIds {
if id == account_id {
return fmt.Errorf("Forbidden account ID (%s)", id)
}
}
}
if c.AllowedAccountIds != nil {
for _, id := range c.AllowedAccountIds {
if id == account_id {
return nil
}
}
return fmt.Errorf("Account ID not allowed (%s)", account_id)
}
return nil
}
// This function is responsible for reading credentials from the
// environment in the case that they're not explicitly specified
// in the Terraform configuration.
func getCreds(key, secret, token, profile, credsfile string) *awsCredentials.Credentials {
// build a chain provider, lazy-evaulated by aws-sdk
providers := []awsCredentials.Provider{
&awsCredentials.StaticProvider{Value: awsCredentials.Value{
AccessKeyID: key,
SecretAccessKey: secret,
SessionToken: token,
}},
&awsCredentials.EnvProvider{},
&awsCredentials.SharedCredentialsProvider{
Filename: credsfile,
Profile: profile,
},
}
// We only look in the EC2 metadata API if we can connect
// to the metadata service within a reasonable amount of time
metadataURL := os.Getenv("AWS_METADATA_URL")
if metadataURL == "" {
metadataURL = "http://169.254.169.254:80/latest"
}
c := http.Client{
Timeout: 100 * time.Millisecond,
}
r, err := c.Get(metadataURL)
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// Flag to determine if we should add the EC2Meta data provider. Default false
var useIAM bool
if err == nil {
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// AWS will add a "Server: EC2ws" header value for the metadata request. We
// check the headers for this value to ensure something else didn't just
// happent to be listening on that IP:Port
if r.Header["Server"] != nil && strings.Contains(r.Header["Server"][0], "EC2") {
useIAM = true
}
}
if useIAM {
log.Printf("[DEBUG] EC2 Metadata service found, adding EC2 Role Credential Provider")
providers = append(providers, &ec2rolecreds.EC2RoleProvider{
Client: ec2metadata.New(session.New(&aws.Config{
Endpoint: aws.String(metadataURL),
})),
})
} else {
log.Printf("[DEBUG] EC2 Metadata service not found, not adding EC2 Role Credential Provider")
}
return awsCredentials.NewChainCredentials(providers)
}