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secret_access_keys.go
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/
secret_access_keys.go
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package aws
import (
"fmt"
"math/rand"
"regexp"
"time"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/iam"
"github.com/aws/aws-sdk-go/service/sts"
"github.com/hashicorp/vault/logical"
"github.com/hashicorp/vault/logical/framework"
)
const SecretAccessKeyType = "access_keys"
func secretAccessKeys(b *backend) *framework.Secret {
return &framework.Secret{
Type: SecretAccessKeyType,
Fields: map[string]*framework.FieldSchema{
"access_key": &framework.FieldSchema{
Type: framework.TypeString,
Description: "Access Key",
},
"secret_key": &framework.FieldSchema{
Type: framework.TypeString,
Description: "Secret Key",
},
"security_token": &framework.FieldSchema{
Type: framework.TypeString,
Description: "Security Token",
},
},
Renew: b.secretAccessKeysRenew,
Revoke: secretAccessKeysRevoke,
}
}
func genUsername(displayName, policyName string) string {
// Generate a random username. We don't put the policy names in the
// username because the AWS console makes it pretty easy to see that.
return fmt.Sprintf(
"vault-%s-%s-%d-%d",
normalizeDisplayName(displayName),
normalizeDisplayName(policyName),
time.Now().Unix(),
rand.Int31n(10000))
}
func (b *backend) secretAccessKeysAndTokenCreate(s logical.Storage,
displayName, policyName, policy string,
lifeTimeInSeconds *int64) (*logical.Response, error) {
STSClient, err := clientSTS(s)
if err != nil {
return logical.ErrorResponse(err.Error()), nil
}
username := genUsername(displayName, policyName)
tokenResp, err := STSClient.GetFederationToken(
&sts.GetFederationTokenInput{
Name: aws.String(username),
Policy: aws.String(policy),
DurationSeconds: lifeTimeInSeconds,
})
if err != nil {
return logical.ErrorResponse(fmt.Sprintf(
"Error generating STS keys: %s", err)), nil
}
resp := b.Secret(SecretAccessKeyType).Response(map[string]interface{}{
"access_key": *tokenResp.Credentials.AccessKeyId,
"secret_key": *tokenResp.Credentials.SecretAccessKey,
"security_token": *tokenResp.Credentials.SessionToken,
}, map[string]interface{}{
"username": username,
"policy": policy,
"is_sts": true,
})
// Set the secret TTL to appropriately match the expiration of the token
resp.Secret.TTL = tokenResp.Credentials.Expiration.Sub(time.Now())
return resp, nil
}
func (b *backend) secretAccessKeysCreate(
s logical.Storage,
displayName, policyName string, policy string) (*logical.Response, error) {
client, err := clientIAM(s)
if err != nil {
return logical.ErrorResponse(err.Error()), nil
}
username := genUsername(displayName, policyName)
// Write to the WAL that this user will be created. We do this before
// the user is created because if switch the order then the WAL put
// can fail, which would put us in an awkward position: we have a user
// we need to rollback but can't put the WAL entry to do the rollback.
walId, err := framework.PutWAL(s, "user", &walUser{
UserName: username,
})
if err != nil {
return nil, fmt.Errorf("Error writing WAL entry: %s", err)
}
// Create the user
_, err = client.CreateUser(&iam.CreateUserInput{
UserName: aws.String(username),
})
if err != nil {
return logical.ErrorResponse(fmt.Sprintf(
"Error creating IAM user: %s", err)), nil
}
if strings.HasPrefix(policy, "arn:") {
// Attach existing policy against user
_, err = client.AttachUserPolicy(&iam.AttachUserPolicyInput{
UserName: aws.String(username),
PolicyArn: aws.String(policy),
})
if err != nil {
return logical.ErrorResponse(fmt.Sprintf(
"Error attaching user policy: %s", err)), nil
}
} else {
// Add new inline user policy against user
_, err = client.PutUserPolicy(&iam.PutUserPolicyInput{
UserName: aws.String(username),
PolicyName: aws.String(policyName),
PolicyDocument: aws.String(policy),
})
if err != nil {
return logical.ErrorResponse(fmt.Sprintf(
"Error putting user policy: %s", err)), nil
}
}
// Create the keys
keyResp, err := client.CreateAccessKey(&iam.CreateAccessKeyInput{
UserName: aws.String(username),
})
if err != nil {
return logical.ErrorResponse(fmt.Sprintf(
"Error creating access keys: %s", err)), nil
}
// Remove the WAL entry, we succeeded! If we fail, we don't return
// the secret because it'll get rolled back anyways, so we have to return
// an error here.
if err := framework.DeleteWAL(s, walId); err != nil {
return nil, fmt.Errorf("Failed to commit WAL entry: %s", err)
}
// Return the info!
resp := b.Secret(SecretAccessKeyType).Response(map[string]interface{}{
"access_key": *keyResp.AccessKey.AccessKeyId,
"secret_key": *keyResp.AccessKey.SecretAccessKey,
"security_token": nil,
}, map[string]interface{}{
"username": username,
"policy": policy,
"is_sts": false,
})
lease, err := b.Lease(s)
if err != nil || lease == nil {
lease = &configLease{}
}
resp.Secret.TTL = lease.Lease
return resp, nil
}
func (b *backend) secretAccessKeysRenew(
req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
// STS already has a lifetime, and we don't support renewing it
isSTSRaw, ok := req.Secret.InternalData["is_sts"]
if ok {
isSTS, ok := isSTSRaw.(bool)
if ok {
if isSTS {
return nil, nil
}
}
}
lease, err := b.Lease(req.Storage)
if err != nil {
return nil, err
}
if lease == nil {
lease = &configLease{}
}
f := framework.LeaseExtend(lease.Lease, lease.LeaseMax, b.System())
return f(req, d)
}
func secretAccessKeysRevoke(
req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
// STS cleans up after itself so we can skip this if is_sts internal data
// element set to true. If is_sts is not set, assumes old version
// and defaults to the IAM approach.
isSTSRaw, ok := req.Secret.InternalData["is_sts"]
if ok {
isSTS, ok := isSTSRaw.(bool)
if ok {
if isSTS {
return nil, nil
}
} else {
return nil, fmt.Errorf("secret has is_sts but value could not be understood")
}
}
// Get the username from the internal data
usernameRaw, ok := req.Secret.InternalData["username"]
if !ok {
return nil, fmt.Errorf("secret is missing username internal data")
}
username, ok := usernameRaw.(string)
if !ok {
return nil, fmt.Errorf("secret is missing username internal data")
}
// Use the user rollback mechanism to delete this user
err := pathUserRollback(req, "user", map[string]interface{}{
"username": username,
})
if err != nil {
return nil, err
}
return nil, nil
}
func normalizeDisplayName(displayName string) string {
re := regexp.MustCompile("[^a-zA-Z0-9+=,.@_-]")
return re.ReplaceAllString(displayName, "_")
}