251 lines
7.2 KiB
Go
251 lines
7.2 KiB
Go
package aws
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import (
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"fmt"
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"log"
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"strings"
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"github.com/hashicorp/terraform/helper/multierror"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/awserr"
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"github.com/aws/aws-sdk-go/aws/credentials"
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"github.com/aws/aws-sdk-go/service/autoscaling"
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"github.com/aws/aws-sdk-go/service/cloudwatch"
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"github.com/aws/aws-sdk-go/service/dynamodb"
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"github.com/aws/aws-sdk-go/service/ec2"
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"github.com/aws/aws-sdk-go/service/ecs"
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"github.com/aws/aws-sdk-go/service/elasticache"
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"github.com/aws/aws-sdk-go/service/elb"
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"github.com/aws/aws-sdk-go/service/iam"
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"github.com/aws/aws-sdk-go/service/kinesis"
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"github.com/aws/aws-sdk-go/service/lambda"
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"github.com/aws/aws-sdk-go/service/rds"
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"github.com/aws/aws-sdk-go/service/route53"
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"github.com/aws/aws-sdk-go/service/s3"
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"github.com/aws/aws-sdk-go/service/sns"
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"github.com/aws/aws-sdk-go/service/sqs"
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)
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type Config struct {
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AccessKey string
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SecretKey string
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Token string
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Region string
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MaxRetries int
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AllowedAccountIds []interface{}
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ForbiddenAccountIds []interface{}
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DynamoDBEndpoint string
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}
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type AWSClient struct {
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cloudwatchconn *cloudwatch.CloudWatch
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dynamodbconn *dynamodb.DynamoDB
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ec2conn *ec2.EC2
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ecsconn *ecs.ECS
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elbconn *elb.ELB
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autoscalingconn *autoscaling.AutoScaling
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s3conn *s3.S3
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sqsconn *sqs.SQS
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snsconn *sns.SNS
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r53conn *route53.Route53
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region string
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rdsconn *rds.RDS
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iamconn *iam.IAM
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kinesisconn *kinesis.Kinesis
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elasticacheconn *elasticache.ElastiCache
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lambdaconn *lambda.Lambda
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}
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// Client configures and returns a fully initialized AWSClient
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func (c *Config) Client() (interface{}, error) {
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var client AWSClient
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// Get the auth and region. This can fail if keys/regions were not
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// specified and we're attempting to use the environment.
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var errs []error
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log.Println("[INFO] Building AWS region structure")
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err := c.ValidateRegion()
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if err != nil {
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errs = append(errs, err)
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}
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if len(errs) == 0 {
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// store AWS region in client struct, for region specific operations such as
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// bucket storage in S3
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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
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// available, they'll already be in c. See Provider definition.
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creds := credentials.NewStaticCredentials(c.AccessKey, c.SecretKey, c.Token)
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awsConfig := &aws.Config{
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Credentials: creds,
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Region: aws.String(c.Region),
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MaxRetries: aws.Int(c.MaxRetries),
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}
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log.Println("[INFO] Initializing IAM Connection")
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client.iamconn = iam.New(awsConfig)
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err := c.ValidateCredentials(client.iamconn)
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if err != nil {
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errs = append(errs, err)
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}
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awsDynamoDBConfig := &aws.Config{
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Credentials: creds,
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Region: aws.String(c.Region),
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MaxRetries: aws.Int(c.MaxRetries),
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Endpoint: aws.String(c.DynamoDBEndpoint),
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}
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log.Println("[INFO] Initializing DynamoDB connection")
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client.dynamodbconn = dynamodb.New(awsDynamoDBConfig)
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log.Println("[INFO] Initializing ELB connection")
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client.elbconn = elb.New(awsConfig)
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log.Println("[INFO] Initializing S3 connection")
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client.s3conn = s3.New(awsConfig)
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log.Println("[INFO] Initializing SQS connection")
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client.sqsconn = sqs.New(awsConfig)
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log.Println("[INFO] Initializing SNS connection")
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client.snsconn = sns.New(awsConfig)
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log.Println("[INFO] Initializing RDS Connection")
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client.rdsconn = rds.New(awsConfig)
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log.Println("[INFO] Initializing Kinesis Connection")
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client.kinesisconn = kinesis.New(awsConfig)
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authErr := c.ValidateAccountId(client.iamconn)
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if authErr != nil {
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errs = append(errs, authErr)
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}
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log.Println("[INFO] Initializing AutoScaling connection")
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client.autoscalingconn = autoscaling.New(awsConfig)
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log.Println("[INFO] Initializing EC2 Connection")
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client.ec2conn = ec2.New(awsConfig)
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log.Println("[INFO] Initializing ECS Connection")
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client.ecsconn = ecs.New(awsConfig)
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// aws-sdk-go uses v4 for signing requests, which requires all global
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// endpoints to use 'us-east-1'.
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// See http://docs.aws.amazon.com/general/latest/gr/sigv4_changes.html
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log.Println("[INFO] Initializing Route 53 connection")
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client.r53conn = route53.New(&aws.Config{
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Credentials: creds,
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Region: aws.String("us-east-1"),
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MaxRetries: aws.Int(c.MaxRetries),
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})
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log.Println("[INFO] Initializing Elasticache Connection")
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client.elasticacheconn = elasticache.New(awsConfig)
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log.Println("[INFO] Initializing Lambda Connection")
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client.lambdaconn = lambda.New(awsConfig)
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log.Println("[INFO] Initializing CloudWatch SDK connection")
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client.cloudwatchconn = cloudwatch.New(awsConfig)
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}
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if len(errs) > 0 {
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return nil, &multierror.Error{Errors: errs}
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}
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return &client, nil
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}
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// ValidateRegion returns an error if the configured region is not a
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// valid aws region and nil otherwise.
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func (c *Config) ValidateRegion() error {
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var regions = [11]string{"us-east-1", "us-west-2", "us-west-1", "eu-west-1",
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"eu-central-1", "ap-southeast-1", "ap-southeast-2", "ap-northeast-1",
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"sa-east-1", "cn-north-1", "us-gov-west-1"}
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for _, valid := range regions {
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if c.Region == valid {
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return nil
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}
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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.
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// In the case of an IAM role/profile with insuffecient privileges, fail
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// silently
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func (c *Config) ValidateCredentials(iamconn *iam.IAM) error {
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_, err := iamconn.GetUser(nil)
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if awsErr, ok := err.(awserr.Error); ok {
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if awsErr.Code() == "AccessDenied" || awsErr.Code() == "ValidationError" {
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log.Printf("[WARN] AccessDenied Error with iam.GetUser, assuming IAM profile")
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// User may be an IAM instance profile, or otherwise IAM role without the
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// GetUser permissions, so fail silently
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return nil
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}
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if awsErr.Code() == "SignatureDoesNotMatch" {
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return fmt.Errorf("Failed authenticating with AWS: please verify credentials")
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}
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}
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return err
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}
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// ValidateAccountId returns a context-specific error if the configured account
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// 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 {
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if c.AllowedAccountIds == nil && c.ForbiddenAccountIds == nil {
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return nil
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}
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log.Printf("[INFO] Validating account ID")
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out, err := iamconn.GetUser(nil)
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if err != nil {
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awsErr, _ := err.(awserr.Error)
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if awsErr.Code() == "ValidationError" {
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log.Printf("[WARN] ValidationError with iam.GetUser, assuming its an IAM profile")
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// User may be an IAM instance profile, so fail silently.
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// If it is an IAM instance profile
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// validating account might be superfluous
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} else {
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return fmt.Errorf("Failed getting account ID from IAM: %s", err)
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// return error if the account id is explicitly not authorised
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}
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}
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account_id := strings.Split(*out.User.Arn, ":")[4]
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if c.ForbiddenAccountIds != nil {
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for _, id := range c.ForbiddenAccountIds {
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if id == account_id {
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return fmt.Errorf("Forbidden account ID (%s)", id)
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}
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}
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}
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if c.AllowedAccountIds != nil {
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for _, id := range c.AllowedAccountIds {
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if id == account_id {
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return nil
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}
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}
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return fmt.Errorf("Account ID not allowed (%s)", account_id)
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}
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return nil
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}
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