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secret_access_keys.go
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secret_access_keys.go
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package aws
import (
"context"
"fmt"
"math/rand"
"regexp"
"time"
"github.com/hashicorp/vault/sdk/framework"
"github.com/hashicorp/vault/sdk/helper/awsutil"
"github.com/hashicorp/vault/sdk/logical"
"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/errwrap"
)
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: b.secretAccessKeysRevoke,
}
}
func genUsername(displayName, policyName, userType string) (ret string, warning string) {
var midString string
switch userType {
case "iam_user":
// IAM users are capped at 64 chars; this leaves, after the beginning and
// end added below, 42 chars to play with.
midString = fmt.Sprintf("%s-%s-",
normalizeDisplayName(displayName),
normalizeDisplayName(policyName))
if len(midString) > 42 {
midString = midString[0:42]
warning = "the calling token display name/IAM policy name were truncated to fit into IAM username length limits"
}
case "sts":
// Capped at 32 chars, which leaves only a couple of characters to play
// with, so don't insert display name or policy name at all
}
ret = fmt.Sprintf("vault-%s%d-%d", midString, time.Now().Unix(), rand.Int31n(10000))
return
}
func (b *backend) getFederationToken(ctx context.Context, s logical.Storage,
displayName, policyName, policy string, policyARNs []string,
iamGroups []string, lifeTimeInSeconds int64) (*logical.Response, error) {
groupPolicies, groupPolicyARNs, err := b.getGroupPolicies(ctx, s, iamGroups)
if err != nil {
return logical.ErrorResponse(err.Error()), nil
}
if groupPolicies != nil {
groupPolicies = append(groupPolicies, policy)
policy, err = combinePolicyDocuments(groupPolicies...)
if err != nil {
return logical.ErrorResponse(err.Error()), nil
}
}
if len(groupPolicyARNs) > 0 {
policyARNs = append(policyARNs, groupPolicyARNs...)
}
stsClient, err := b.clientSTS(ctx, s)
if err != nil {
return logical.ErrorResponse(err.Error()), nil
}
username, usernameWarning := genUsername(displayName, policyName, "sts")
getTokenInput := &sts.GetFederationTokenInput{
Name: aws.String(username),
DurationSeconds: &lifeTimeInSeconds,
}
if len(policy) > 0 {
getTokenInput.Policy = aws.String(policy)
}
if len(policyARNs) > 0 {
getTokenInput.PolicyArns = convertPolicyARNs(policyARNs)
}
// If neither a policy document nor policy ARNs are specified, then GetFederationToken will
// return credentials equivalent to that of the Vault server itself. We probably don't want
// that by default; the behavior can be explicitly opted in to by associating the Vault role
// with a policy ARN or document that allows the appropriate permissions.
if policy == "" && len(policyARNs) == 0 {
return logical.ErrorResponse("must specify at least one of policy_arns or policy_document with %s credential_type", federationTokenCred), nil
}
tokenResp, err := stsClient.GetFederationToken(getTokenInput)
if err != nil {
return logical.ErrorResponse("Error generating STS keys: %s", err), awsutil.CheckAWSError(err)
}
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())
// STS are purposefully short-lived and aren't renewable
resp.Secret.Renewable = false
if usernameWarning != "" {
resp.AddWarning(usernameWarning)
}
return resp, nil
}
func (b *backend) assumeRole(ctx context.Context, s logical.Storage,
displayName, roleName, roleArn, policy string, policyARNs []string,
iamGroups []string, lifeTimeInSeconds int64, roleSessionName string) (*logical.Response, error) {
// grab any IAM group policies associated with the vault role, both inline
// and managed
groupPolicies, groupPolicyARNs, err := b.getGroupPolicies(ctx, s, iamGroups)
if err != nil {
return logical.ErrorResponse(err.Error()), nil
}
if len(groupPolicies) > 0 {
groupPolicies = append(groupPolicies, policy)
policy, err = combinePolicyDocuments(groupPolicies...)
if err != nil {
return logical.ErrorResponse(err.Error()), nil
}
}
if len(groupPolicyARNs) > 0 {
policyARNs = append(policyARNs, groupPolicyARNs...)
}
stsClient, err := b.clientSTS(ctx, s)
if err != nil {
return logical.ErrorResponse(err.Error()), nil
}
roleSessionNameWarning := ""
if roleSessionName == "" {
roleSessionName, roleSessionNameWarning = genUsername(displayName, roleName, "iam_user")
} else {
roleSessionName = normalizeDisplayName(roleSessionName)
if len(roleSessionName) > 64 {
roleSessionName = roleSessionName[0:64]
roleSessionNameWarning = "the role session name was truncated to 64 characters to fit within IAM session name length limits"
}
}
assumeRoleInput := &sts.AssumeRoleInput{
RoleSessionName: aws.String(roleSessionName),
RoleArn: aws.String(roleArn),
DurationSeconds: &lifeTimeInSeconds,
}
if policy != "" {
assumeRoleInput.SetPolicy(policy)
}
if len(policyARNs) > 0 {
assumeRoleInput.SetPolicyArns(convertPolicyARNs(policyARNs))
}
tokenResp, err := stsClient.AssumeRole(assumeRoleInput)
if err != nil {
return logical.ErrorResponse("Error assuming role: %s", err), awsutil.CheckAWSError(err)
}
resp := b.Secret(secretAccessKeyType).Response(map[string]interface{}{
"access_key": *tokenResp.Credentials.AccessKeyId,
"secret_key": *tokenResp.Credentials.SecretAccessKey,
"security_token": *tokenResp.Credentials.SessionToken,
"arn": *tokenResp.AssumedRoleUser.Arn,
}, map[string]interface{}{
"username": roleSessionName,
"policy": roleArn,
"is_sts": true,
})
// Set the secret TTL to appropriately match the expiration of the token
resp.Secret.TTL = tokenResp.Credentials.Expiration.Sub(time.Now())
// STS are purposefully short-lived and aren't renewable
resp.Secret.Renewable = false
if roleSessionNameWarning != "" {
resp.AddWarning(roleSessionNameWarning)
}
return resp, nil
}
func (b *backend) secretAccessKeysCreate(
ctx context.Context,
s logical.Storage,
displayName, policyName string,
role *awsRoleEntry) (*logical.Response, error) {
iamClient, err := b.clientIAM(ctx, s)
if err != nil {
return logical.ErrorResponse(err.Error()), nil
}
username, usernameWarning := genUsername(displayName, policyName, "iam_user")
// 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(ctx, s, "user", &walUser{
UserName: username,
})
if err != nil {
return nil, errwrap.Wrapf("error writing WAL entry: {{err}}", err)
}
userPath := role.UserPath
if userPath == "" {
userPath = "/"
}
createUserRequest := &iam.CreateUserInput{
UserName: aws.String(username),
Path: aws.String(userPath),
}
if role.PermissionsBoundaryARN != "" {
createUserRequest.PermissionsBoundary = aws.String(role.PermissionsBoundaryARN)
}
// Create the user
_, err = iamClient.CreateUser(createUserRequest)
if err != nil {
if walErr := framework.DeleteWAL(ctx, s, walID); walErr != nil {
iamErr := errwrap.Wrapf("error creating IAM user: {{err}}", err)
return nil, errwrap.Wrap(errwrap.Wrapf("failed to delete WAL entry: {{err}}", walErr), iamErr)
}
return logical.ErrorResponse("Error creating IAM user: %s", err), awsutil.CheckAWSError(err)
}
for _, arn := range role.PolicyArns {
// Attach existing policy against user
_, err = iamClient.AttachUserPolicy(&iam.AttachUserPolicyInput{
UserName: aws.String(username),
PolicyArn: aws.String(arn),
})
if err != nil {
return logical.ErrorResponse("Error attaching user policy: %s", err), awsutil.CheckAWSError(err)
}
}
if role.PolicyDocument != "" {
// Add new inline user policy against user
_, err = iamClient.PutUserPolicy(&iam.PutUserPolicyInput{
UserName: aws.String(username),
PolicyName: aws.String(policyName),
PolicyDocument: aws.String(role.PolicyDocument),
})
if err != nil {
return logical.ErrorResponse("Error putting user policy: %s", err), awsutil.CheckAWSError(err)
}
}
for _, group := range role.IAMGroups {
// Add user to IAM groups
_, err = iamClient.AddUserToGroup(&iam.AddUserToGroupInput{
UserName: aws.String(username),
GroupName: aws.String(group),
})
if err != nil {
return logical.ErrorResponse("Error adding user to group: %s", err), awsutil.CheckAWSError(err)
}
}
var tags []*iam.Tag
for key, value := range role.IAMTags {
// This assignment needs to be done in order to create unique addresses for
// these variables. Without doing so, all the tags will be copies of the last
// tag listed in the role.
k, v := key, value
tags = append(tags, &iam.Tag{Key: &k, Value: &v})
}
if len(tags) > 0 {
_, err = iamClient.TagUser(&iam.TagUserInput{
Tags: tags,
UserName: &username,
})
if err != nil {
return logical.ErrorResponse("Error adding tags to user: %s", err), awsutil.CheckAWSError(err)
}
}
// Create the keys
keyResp, err := iamClient.CreateAccessKey(&iam.CreateAccessKeyInput{
UserName: aws.String(username),
})
if err != nil {
return logical.ErrorResponse("Error creating access keys: %s", err), awsutil.CheckAWSError(err)
}
// 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(ctx, s, walID); err != nil {
return nil, errwrap.Wrapf("failed to commit WAL entry: {{err}}", 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": role,
"is_sts": false,
})
lease, err := b.Lease(ctx, s)
if err != nil || lease == nil {
lease = &configLease{}
}
resp.Secret.TTL = lease.Lease
resp.Secret.MaxTTL = lease.LeaseMax
if usernameWarning != "" {
resp.AddWarning(usernameWarning)
}
return resp, nil
}
func (b *backend) secretAccessKeysRenew(ctx context.Context, 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(ctx, req.Storage)
if err != nil {
return nil, err
}
if lease == nil {
lease = &configLease{}
}
resp := &logical.Response{Secret: req.Secret}
resp.Secret.TTL = lease.Lease
resp.Secret.MaxTTL = lease.LeaseMax
return resp, nil
}
func (b *backend) secretAccessKeysRevoke(ctx context.Context, 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 := b.pathUserRollback(ctx, 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, "_")
}
func convertPolicyARNs(policyARNs []string) []*sts.PolicyDescriptorType {
size := len(policyARNs)
retval := make([]*sts.PolicyDescriptorType, size, size)
for i, arn := range policyARNs {
retval[i] = &sts.PolicyDescriptorType{
Arn: aws.String(arn),
}
}
return retval
}