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backend.go
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backend.go
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package s3
import (
"context"
"encoding/base64"
"errors"
"fmt"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/dynamodb"
"github.com/aws/aws-sdk-go/service/s3"
awsbase "github.com/hashicorp/aws-sdk-go-base"
"github.com/hashicorp/terraform/backend"
"github.com/hashicorp/terraform/helper/logging"
"github.com/hashicorp/terraform/helper/schema"
"github.com/hashicorp/terraform/version"
)
// New creates a new backend for S3 remote state.
func New() backend.Backend {
s := &schema.Backend{
Schema: map[string]*schema.Schema{
"bucket": {
Type: schema.TypeString,
Required: true,
Description: "The name of the S3 bucket",
},
"key": {
Type: schema.TypeString,
Required: true,
Description: "The path to the state file inside the bucket",
ValidateFunc: func(v interface{}, s string) ([]string, []error) {
// s3 will strip leading slashes from an object, so while this will
// technically be accepted by s3, it will break our workspace hierarchy.
if strings.HasPrefix(v.(string), "/") {
return nil, []error{errors.New("key must not start with '/'")}
}
return nil, nil
},
},
"region": {
Type: schema.TypeString,
Required: true,
Description: "AWS region of the S3 Bucket and DynamoDB Table (if used).",
DefaultFunc: schema.MultiEnvDefaultFunc([]string{
"AWS_REGION",
"AWS_DEFAULT_REGION",
}, nil),
},
"dynamodb_endpoint": {
Type: schema.TypeString,
Optional: true,
Description: "A custom endpoint for the DynamoDB API",
DefaultFunc: schema.EnvDefaultFunc("AWS_DYNAMODB_ENDPOINT", ""),
},
"endpoint": {
Type: schema.TypeString,
Optional: true,
Description: "A custom endpoint for the S3 API",
DefaultFunc: schema.EnvDefaultFunc("AWS_S3_ENDPOINT", ""),
},
"iam_endpoint": {
Type: schema.TypeString,
Optional: true,
Description: "A custom endpoint for the IAM API",
DefaultFunc: schema.EnvDefaultFunc("AWS_IAM_ENDPOINT", ""),
},
"sts_endpoint": {
Type: schema.TypeString,
Optional: true,
Description: "A custom endpoint for the STS API",
DefaultFunc: schema.EnvDefaultFunc("AWS_STS_ENDPOINT", ""),
},
"encrypt": {
Type: schema.TypeBool,
Optional: true,
Description: "Whether to enable server side encryption of the state file",
Default: false,
},
"acl": {
Type: schema.TypeString,
Optional: true,
Description: "Canned ACL to be applied to the state file",
Default: "",
},
"access_key": {
Type: schema.TypeString,
Optional: true,
Description: "AWS access key",
Default: "",
},
"secret_key": {
Type: schema.TypeString,
Optional: true,
Description: "AWS secret key",
Default: "",
},
"kms_key_id": {
Type: schema.TypeString,
Optional: true,
Description: "The ARN of a KMS Key to use for encrypting the state",
Default: "",
},
"dynamodb_table": {
Type: schema.TypeString,
Optional: true,
Description: "DynamoDB table for state locking and consistency",
Default: "",
},
"profile": {
Type: schema.TypeString,
Optional: true,
Description: "AWS profile name",
Default: "",
},
"shared_credentials_file": {
Type: schema.TypeString,
Optional: true,
Description: "Path to a shared credentials file",
Default: "",
},
"token": {
Type: schema.TypeString,
Optional: true,
Description: "MFA token",
Default: "",
},
"skip_credentials_validation": {
Type: schema.TypeBool,
Optional: true,
Description: "Skip the credentials validation via STS API.",
Default: false,
},
"skip_region_validation": {
Type: schema.TypeBool,
Optional: true,
Description: "Skip static validation of region name.",
Default: false,
},
"skip_metadata_api_check": {
Type: schema.TypeBool,
Optional: true,
Description: "Skip the AWS Metadata API check.",
Default: false,
},
"sse_customer_key": {
Type: schema.TypeString,
Optional: true,
Description: "The base64-encoded encryption key to use for server-side encryption with customer-provided keys (SSE-C).",
DefaultFunc: schema.EnvDefaultFunc("AWS_SSE_CUSTOMER_KEY", ""),
Sensitive: true,
ValidateFunc: func(v interface{}, s string) ([]string, []error) {
key := v.(string)
if key != "" && len(key) != 44 {
return nil, []error{errors.New("sse_customer_key must be 44 characters in length (256 bits, base64 encoded)")}
}
return nil, nil
},
},
"role_arn": {
Type: schema.TypeString,
Optional: true,
Description: "The role to be assumed",
Default: "",
},
"session_name": {
Type: schema.TypeString,
Optional: true,
Description: "The session name to use when assuming the role.",
Default: "",
},
"external_id": {
Type: schema.TypeString,
Optional: true,
Description: "The external ID to use when assuming the role",
Default: "",
},
"assume_role_duration_seconds": {
Type: schema.TypeInt,
Optional: true,
Description: "Seconds to restrict the assume role session duration.",
},
"assume_role_policy": {
Type: schema.TypeString,
Optional: true,
Description: "IAM Policy JSON describing further restricting permissions for the IAM Role being assumed.",
Default: "",
},
"assume_role_policy_arns": {
Type: schema.TypeSet,
Optional: true,
Description: "Amazon Resource Names (ARNs) of IAM Policies describing further restricting permissions for the IAM Role being assumed.",
Elem: &schema.Schema{Type: schema.TypeString},
},
"assume_role_tags": {
Type: schema.TypeMap,
Optional: true,
Description: "Assume role session tags.",
Elem: &schema.Schema{Type: schema.TypeString},
},
"assume_role_transitive_tag_keys": {
Type: schema.TypeSet,
Optional: true,
Description: "Assume role session tag keys to pass to any subsequent sessions.",
Elem: &schema.Schema{Type: schema.TypeString},
},
"workspace_key_prefix": {
Type: schema.TypeString,
Optional: true,
Description: "The prefix applied to the non-default state path inside the bucket.",
Default: "env:",
ValidateFunc: func(v interface{}, s string) ([]string, []error) {
prefix := v.(string)
if strings.HasPrefix(prefix, "/") || strings.HasSuffix(prefix, "/") {
return nil, []error{errors.New("workspace_key_prefix must not start or end with '/'")}
}
return nil, nil
},
},
"force_path_style": {
Type: schema.TypeBool,
Optional: true,
Description: "Force s3 to use path style api.",
Default: false,
},
"max_retries": {
Type: schema.TypeInt,
Optional: true,
Description: "The maximum number of times an AWS API request is retried on retryable failure.",
Default: 5,
},
},
}
result := &Backend{Backend: s}
result.Backend.ConfigureFunc = result.configure
return result
}
type Backend struct {
*schema.Backend
// The fields below are set from configure
s3Client *s3.S3
dynClient *dynamodb.DynamoDB
bucketName string
keyName string
serverSideEncryption bool
customerEncryptionKey []byte
acl string
kmsKeyID string
ddbTable string
workspaceKeyPrefix string
}
func (b *Backend) configure(ctx context.Context) error {
if b.s3Client != nil {
return nil
}
// Grab the resource data
data := schema.FromContextBackendConfig(ctx)
if !data.Get("skip_region_validation").(bool) {
if err := awsbase.ValidateRegion(data.Get("region").(string)); err != nil {
return err
}
}
b.bucketName = data.Get("bucket").(string)
b.keyName = data.Get("key").(string)
b.acl = data.Get("acl").(string)
b.workspaceKeyPrefix = data.Get("workspace_key_prefix").(string)
b.serverSideEncryption = data.Get("encrypt").(bool)
b.kmsKeyID = data.Get("kms_key_id").(string)
b.ddbTable = data.Get("dynamodb_table").(string)
customerKeyString := data.Get("sse_customer_key").(string)
if customerKeyString != "" {
if b.kmsKeyID != "" {
return errors.New(encryptionKeyConflictError)
}
var err error
b.customerEncryptionKey, err = base64.StdEncoding.DecodeString(customerKeyString)
if err != nil {
return fmt.Errorf("Failed to decode sse_customer_key: %s", err.Error())
}
}
cfg := &awsbase.Config{
AccessKey: data.Get("access_key").(string),
AssumeRoleARN: data.Get("role_arn").(string),
AssumeRoleDurationSeconds: data.Get("assume_role_duration_seconds").(int),
AssumeRoleExternalID: data.Get("external_id").(string),
AssumeRolePolicy: data.Get("assume_role_policy").(string),
AssumeRoleSessionName: data.Get("session_name").(string),
CallerDocumentationURL: "https://www.terraform.io/docs/backends/types/s3.html",
CallerName: "S3 Backend",
CredsFilename: data.Get("shared_credentials_file").(string),
DebugLogging: logging.IsDebugOrHigher(),
IamEndpoint: data.Get("iam_endpoint").(string),
MaxRetries: data.Get("max_retries").(int),
Profile: data.Get("profile").(string),
Region: data.Get("region").(string),
SecretKey: data.Get("secret_key").(string),
SkipCredsValidation: data.Get("skip_credentials_validation").(bool),
SkipMetadataApiCheck: data.Get("skip_metadata_api_check").(bool),
StsEndpoint: data.Get("sts_endpoint").(string),
Token: data.Get("token").(string),
UserAgentProducts: []*awsbase.UserAgentProduct{
{Name: "APN", Version: "1.0"},
{Name: "HashiCorp", Version: "1.0"},
{Name: "Terraform", Version: version.String()},
},
}
if policyARNSet := data.Get("assume_role_policy_arns").(*schema.Set); policyARNSet.Len() > 0 {
for _, policyARNRaw := range policyARNSet.List() {
policyARN, ok := policyARNRaw.(string)
if !ok {
continue
}
cfg.AssumeRolePolicyARNs = append(cfg.AssumeRolePolicyARNs, policyARN)
}
}
if tagMap := data.Get("assume_role_tags").(map[string]interface{}); len(tagMap) > 0 {
cfg.AssumeRoleTags = make(map[string]string)
for k, vRaw := range tagMap {
v, ok := vRaw.(string)
if !ok {
continue
}
cfg.AssumeRoleTags[k] = v
}
}
if transitiveTagKeySet := data.Get("assume_role_transitive_tag_keys").(*schema.Set); transitiveTagKeySet.Len() > 0 {
for _, transitiveTagKeyRaw := range transitiveTagKeySet.List() {
transitiveTagKey, ok := transitiveTagKeyRaw.(string)
if !ok {
continue
}
cfg.AssumeRoleTransitiveTagKeys = append(cfg.AssumeRoleTransitiveTagKeys, transitiveTagKey)
}
}
sess, err := awsbase.GetSession(cfg)
if err != nil {
return fmt.Errorf("error configuring S3 Backend: %w", err)
}
b.dynClient = dynamodb.New(sess.Copy(&aws.Config{
Endpoint: aws.String(data.Get("dynamodb_endpoint").(string)),
}))
b.s3Client = s3.New(sess.Copy(&aws.Config{
Endpoint: aws.String(data.Get("endpoint").(string)),
S3ForcePathStyle: aws.Bool(data.Get("force_path_style").(bool)),
}))
return nil
}
const encryptionKeyConflictError = `Cannot have both kms_key_id and sse_customer_key set.
The kms_key_id is used for encryption with KMS-Managed Keys (SSE-KMS)
while sse_customer_key is used for encryption with customer-managed keys (SSE-C).
Please choose one or the other.`