terraform/builtin/providers/aws/config.go

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package aws
import (
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"fmt"
"log"
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"strings"
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"github.com/hashicorp/terraform/helper/multierror"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/service/autoscaling"
"github.com/aws/aws-sdk-go/service/cloudwatch"
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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/ecs"
"github.com/aws/aws-sdk-go/service/elasticache"
"github.com/aws/aws-sdk-go/service/elb"
"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/rds"
"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
Token string
Region string
MaxRetries int
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AllowedAccountIds []interface{}
ForbiddenAccountIds []interface{}
DynamoDBEndpoint string
}
type AWSClient struct {
cloudwatchconn *cloudwatch.CloudWatch
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dynamodbconn *dynamodb.DynamoDB
ec2conn *ec2.EC2
ecsconn *ecs.ECS
elbconn *elb.ELB
autoscalingconn *autoscaling.AutoScaling
s3conn *s3.S3
sqsconn *sqs.SQS
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snsconn *sns.SNS
r53conn *route53.Route53
region string
rdsconn *rds.RDS
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iamconn *iam.IAM
kinesisconn *kinesis.Kinesis
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elasticacheconn *elasticache.ElastiCache
lambdaconn *lambda.Lambda
}
// 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")
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// We fetched all credential sources in Provider. If they are
// available, they'll already be in c. See Provider definition.
creds := credentials.NewStaticCredentials(c.AccessKey, c.SecretKey, c.Token)
awsConfig := &aws.Config{
Credentials: creds,
Region: aws.String(c.Region),
MaxRetries: aws.Int(c.MaxRetries),
}
log.Println("[INFO] Initializing IAM Connection")
client.iamconn = iam.New(awsConfig)
err := c.ValidateCredentials(client.iamconn)
if err != nil {
errs = append(errs, err)
}
awsDynamoDBConfig := &aws.Config{
Credentials: creds,
Region: aws.String(c.Region),
MaxRetries: aws.Int(c.MaxRetries),
Endpoint: aws.String(c.DynamoDBEndpoint),
}
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log.Println("[INFO] Initializing DynamoDB connection")
client.dynamodbconn = dynamodb.New(awsDynamoDBConfig)
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log.Println("[INFO] Initializing ELB connection")
client.elbconn = elb.New(awsConfig)
log.Println("[INFO] Initializing S3 connection")
client.s3conn = s3.New(awsConfig)
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log.Println("[INFO] Initializing SQS connection")
client.sqsconn = sqs.New(awsConfig)
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log.Println("[INFO] Initializing SNS connection")
client.snsconn = sns.New(awsConfig)
log.Println("[INFO] Initializing RDS Connection")
client.rdsconn = rds.New(awsConfig)
log.Println("[INFO] Initializing Kinesis Connection")
client.kinesisconn = kinesis.New(awsConfig)
authErr := c.ValidateAccountId(client.iamconn)
if authErr != nil {
errs = append(errs, authErr)
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}
log.Println("[INFO] Initializing AutoScaling connection")
client.autoscalingconn = autoscaling.New(awsConfig)
log.Println("[INFO] Initializing EC2 Connection")
client.ec2conn = ec2.New(awsConfig)
log.Println("[INFO] Initializing ECS Connection")
client.ecsconn = ecs.New(awsConfig)
// aws-sdk-go uses v4 for signing requests, which requires all global
// endpoints to use 'us-east-1'.
// See http://docs.aws.amazon.com/general/latest/gr/sigv4_changes.html
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log.Println("[INFO] Initializing Route 53 connection")
client.r53conn = route53.New(&aws.Config{
Credentials: creds,
Region: aws.String("us-east-1"),
MaxRetries: aws.Int(c.MaxRetries),
})
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log.Println("[INFO] Initializing Elasticache Connection")
client.elasticacheconn = elasticache.New(awsConfig)
log.Println("[INFO] Initializing Lambda Connection")
client.lambdaconn = lambda.New(awsConfig)
log.Println("[INFO] Initializing CloudWatch SDK connection")
client.cloudwatchconn = cloudwatch.New(awsConfig)
}
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 = [11]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",
"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)
if err != nil {
return fmt.Errorf("Failed getting account ID from IAM: %s", err)
}
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
}