140 lines
3.2 KiB
Go
140 lines
3.2 KiB
Go
package aws
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import (
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"context"
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"strings"
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"sync"
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"time"
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"github.com/aws/aws-sdk-go/service/iam/iamiface"
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"github.com/aws/aws-sdk-go/service/sts/stsiface"
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"github.com/hashicorp/vault/sdk/framework"
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"github.com/hashicorp/vault/sdk/logical"
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)
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func Factory(ctx context.Context, conf *logical.BackendConfig) (logical.Backend, error) {
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b := Backend()
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if err := b.Setup(ctx, conf); err != nil {
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return nil, err
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}
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return b, nil
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}
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func Backend() *backend {
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var b backend
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b.Backend = &framework.Backend{
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Help: strings.TrimSpace(backendHelp),
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PathsSpecial: &logical.Paths{
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LocalStorage: []string{
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framework.WALPrefix,
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},
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SealWrapStorage: []string{
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"config/root",
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},
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},
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Paths: []*framework.Path{
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pathConfigRoot(&b),
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pathConfigRotateRoot(&b),
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pathConfigLease(&b),
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pathRoles(&b),
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pathListRoles(&b),
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pathUser(&b),
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},
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Secrets: []*framework.Secret{
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secretAccessKeys(&b),
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},
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WALRollback: b.walRollback,
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WALRollbackMinAge: minAwsUserRollbackAge,
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BackendType: logical.TypeLogical,
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}
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return &b
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}
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type backend struct {
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*framework.Backend
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// Mutex to protect access to reading and writing policies
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roleMutex sync.RWMutex
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// Mutex to protect access to iam/sts clients and client configs
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clientMutex sync.RWMutex
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// iamClient and stsClient hold configured iam and sts clients for reuse, and
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// to enable mocking with AWS iface for tests
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iamClient iamiface.IAMAPI
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stsClient stsiface.STSAPI
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}
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const backendHelp = `
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The AWS backend dynamically generates AWS access keys for a set of
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IAM policies. The AWS access keys have a configurable lease set and
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are automatically revoked at the end of the lease.
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After mounting this backend, credentials to generate IAM keys must
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be configured with the "root" path and policies must be written using
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the "roles/" endpoints before any access keys can be generated.
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`
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// clientIAM returns the configured IAM client. If nil, it constructs a new one
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// and returns it, setting it the internal variable
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func (b *backend) clientIAM(ctx context.Context, s logical.Storage) (iamiface.IAMAPI, error) {
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b.clientMutex.RLock()
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if b.iamClient != nil {
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b.clientMutex.RUnlock()
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return b.iamClient, nil
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}
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// Upgrade the lock for writing
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b.clientMutex.RUnlock()
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b.clientMutex.Lock()
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defer b.clientMutex.Unlock()
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// check client again, in the event that a client was being created while we
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// waited for Lock()
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if b.iamClient != nil {
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return b.iamClient, nil
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}
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iamClient, err := nonCachedClientIAM(ctx, s)
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if err != nil {
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return nil, err
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}
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b.iamClient = iamClient
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return b.iamClient, nil
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}
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func (b *backend) clientSTS(ctx context.Context, s logical.Storage) (stsiface.STSAPI, error) {
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b.clientMutex.RLock()
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if b.stsClient != nil {
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b.clientMutex.RUnlock()
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return b.stsClient, nil
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}
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// Upgrade the lock for writing
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b.clientMutex.RUnlock()
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b.clientMutex.Lock()
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defer b.clientMutex.Unlock()
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// check client again, in the event that a client was being created while we
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// waited for Lock()
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if b.stsClient != nil {
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return b.stsClient, nil
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}
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stsClient, err := nonCachedClientSTS(ctx, s)
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if err != nil {
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return nil, err
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}
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b.stsClient = stsClient
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return b.stsClient, nil
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}
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const minAwsUserRollbackAge = 5 * time.Minute
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