384 lines
12 KiB
Go
384 lines
12 KiB
Go
package aws
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import (
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"fmt"
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"log"
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"net/http"
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"os"
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"strings"
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"time"
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"github.com/hashicorp/go-cleanhttp"
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"github.com/hashicorp/go-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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awsCredentials "github.com/aws/aws-sdk-go/aws/credentials"
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"github.com/aws/aws-sdk-go/aws/credentials/ec2rolecreds"
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"github.com/aws/aws-sdk-go/aws/ec2metadata"
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"github.com/aws/aws-sdk-go/aws/session"
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"github.com/aws/aws-sdk-go/service/autoscaling"
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"github.com/aws/aws-sdk-go/service/cloudformation"
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"github.com/aws/aws-sdk-go/service/cloudtrail"
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"github.com/aws/aws-sdk-go/service/cloudwatch"
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"github.com/aws/aws-sdk-go/service/cloudwatchlogs"
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"github.com/aws/aws-sdk-go/service/codecommit"
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"github.com/aws/aws-sdk-go/service/codedeploy"
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"github.com/aws/aws-sdk-go/service/directoryservice"
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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/ecr"
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"github.com/aws/aws-sdk-go/service/ecs"
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"github.com/aws/aws-sdk-go/service/efs"
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"github.com/aws/aws-sdk-go/service/elasticache"
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elasticsearch "github.com/aws/aws-sdk-go/service/elasticsearchservice"
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"github.com/aws/aws-sdk-go/service/elb"
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"github.com/aws/aws-sdk-go/service/firehose"
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"github.com/aws/aws-sdk-go/service/glacier"
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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/opsworks"
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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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KinesisEndpoint string
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}
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type AWSClient struct {
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cfconn *cloudformation.CloudFormation
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cloudtrailconn *cloudtrail.CloudTrail
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cloudwatchconn *cloudwatch.CloudWatch
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cloudwatchlogsconn *cloudwatchlogs.CloudWatchLogs
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dsconn *directoryservice.DirectoryService
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dynamodbconn *dynamodb.DynamoDB
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ec2conn *ec2.EC2
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ecrconn *ecr.ECR
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ecsconn *ecs.ECS
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efsconn *efs.EFS
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elbconn *elb.ELB
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esconn *elasticsearch.ElasticsearchService
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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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firehoseconn *firehose.Firehose
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elasticacheconn *elasticache.ElastiCache
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lambdaconn *lambda.Lambda
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opsworksconn *opsworks.OpsWorks
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glacierconn *glacier.Glacier
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codedeployconn *codedeploy.CodeDeploy
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codecommitconn *codecommit.CodeCommit
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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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creds := getCreds(c.AccessKey, c.SecretKey, c.Token)
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// Call Get to check for credential provider. If nothing found, we'll get an
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// error, and we can present it nicely to the user
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_, err = creds.Get()
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if err != nil {
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errs = append(errs, fmt.Errorf("Error loading credentials for AWS Provider: %s", err))
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return nil, &multierror.Error{Errors: errs}
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}
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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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HTTPClient: cleanhttp.DefaultClient(),
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}
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log.Println("[INFO] Initializing IAM Connection")
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sess := session.New(awsConfig)
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client.iamconn = iam.New(sess)
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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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// Some services exist only in us-east-1, e.g. because they manage
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// resources that can span across multiple regions, or because
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// signature format v4 requires region to be us-east-1 for global
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// endpoints:
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// http://docs.aws.amazon.com/general/latest/gr/sigv4_changes.html
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usEast1AwsConfig := &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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HTTPClient: cleanhttp.DefaultClient(),
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}
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usEast1Sess := session.New(usEast1AwsConfig)
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awsDynamoDBConfig := *awsConfig
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awsDynamoDBConfig.Endpoint = aws.String(c.DynamoDBEndpoint)
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log.Println("[INFO] Initializing DynamoDB connection")
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dynamoSess := session.New(&awsDynamoDBConfig)
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client.dynamodbconn = dynamodb.New(dynamoSess)
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log.Println("[INFO] Initializing ELB connection")
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client.elbconn = elb.New(sess)
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log.Println("[INFO] Initializing S3 connection")
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client.s3conn = s3.New(sess)
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log.Println("[INFO] Initializing SQS connection")
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client.sqsconn = sqs.New(sess)
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log.Println("[INFO] Initializing SNS connection")
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client.snsconn = sns.New(sess)
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log.Println("[INFO] Initializing RDS Connection")
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client.rdsconn = rds.New(sess)
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awsKinesisConfig := *awsConfig
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awsKinesisConfig.Endpoint = aws.String(c.KinesisEndpoint)
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log.Println("[INFO] Initializing Kinesis Connection")
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kinesisSess := session.New(&awsKinesisConfig)
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client.kinesisconn = kinesis.New(kinesisSess)
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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 Kinesis Firehose Connection")
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client.firehoseconn = firehose.New(sess)
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log.Println("[INFO] Initializing AutoScaling connection")
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client.autoscalingconn = autoscaling.New(sess)
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log.Println("[INFO] Initializing EC2 Connection")
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client.ec2conn = ec2.New(sess)
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log.Println("[INFO] Initializing ECR Connection")
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client.ecrconn = ecr.New(sess)
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log.Println("[INFO] Initializing ECS Connection")
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client.ecsconn = ecs.New(sess)
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log.Println("[INFO] Initializing EFS Connection")
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client.efsconn = efs.New(sess)
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log.Println("[INFO] Initializing ElasticSearch Connection")
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client.esconn = elasticsearch.New(sess)
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log.Println("[INFO] Initializing Route 53 connection")
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client.r53conn = route53.New(usEast1Sess)
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log.Println("[INFO] Initializing Elasticache Connection")
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client.elasticacheconn = elasticache.New(sess)
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log.Println("[INFO] Initializing Lambda Connection")
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client.lambdaconn = lambda.New(sess)
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log.Println("[INFO] Initializing Cloudformation Connection")
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client.cfconn = cloudformation.New(sess)
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log.Println("[INFO] Initializing CloudWatch SDK connection")
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client.cloudwatchconn = cloudwatch.New(sess)
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log.Println("[INFO] Initializing CloudTrail connection")
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client.cloudtrailconn = cloudtrail.New(sess)
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log.Println("[INFO] Initializing CloudWatch Logs connection")
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client.cloudwatchlogsconn = cloudwatchlogs.New(sess)
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log.Println("[INFO] Initializing OpsWorks Connection")
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client.opsworksconn = opsworks.New(usEast1Sess)
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log.Println("[INFO] Initializing Directory Service connection")
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client.dsconn = directoryservice.New(sess)
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log.Println("[INFO] Initializing Glacier connection")
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client.glacierconn = glacier.New(sess)
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log.Println("[INFO] Initializing CodeDeploy Connection")
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client.codedeployconn = codedeploy.New(sess)
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log.Println("[INFO] Initializing CodeCommit SDK connection")
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client.codecommitconn = codecommit.New(usEast1Sess)
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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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return nil
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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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// This function is responsible for reading credentials from the
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// environment in the case that they're not explicitly specified
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// in the Terraform configuration.
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func getCreds(key, secret, token string) *awsCredentials.Credentials {
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// build a chain provider, lazy-evaulated by aws-sdk
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providers := []awsCredentials.Provider{
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&awsCredentials.StaticProvider{Value: awsCredentials.Value{
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AccessKeyID: key,
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SecretAccessKey: secret,
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SessionToken: token,
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}},
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&awsCredentials.EnvProvider{},
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&awsCredentials.SharedCredentialsProvider{},
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}
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// We only look in the EC2 metadata API if we can connect
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// to the metadata service within a reasonable amount of time
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metadataURL := os.Getenv("AWS_METADATA_URL")
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if metadataURL == "" {
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metadataURL = "http://169.254.169.254:80/latest"
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}
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c := http.Client{
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Timeout: 100 * time.Millisecond,
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}
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r, err := c.Get(metadataURL)
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// Flag to determine if we should add the EC2Meta data provider. Default false
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var useIAM bool
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if err == nil {
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// AWS will add a "Server: EC2ws" header value for the metadata request. We
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// check the headers for this value to ensure something else didn't just
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// happent to be listening on that IP:Port
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if r.Header["Server"] != nil && strings.Contains(r.Header["Server"][0], "EC2") {
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useIAM = true
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}
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}
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if useIAM {
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log.Printf("[DEBUG] EC2 Metadata service found, adding EC2 Role Credential Provider")
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providers = append(providers, &ec2rolecreds.EC2RoleProvider{
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Client: ec2metadata.New(session.New(&aws.Config{
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Endpoint: aws.String(metadataURL),
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})),
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})
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} else {
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log.Printf("[DEBUG] EC2 Metadata service not found, not adding EC2 Role Credential Provider")
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}
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return awsCredentials.NewChainCredentials(providers)
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}
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