secrets: introduce new secrets subsystemsecrets/v0.1.0

4 files changed, 930 insertions, 0 deletions

diff --git a/secrets/client.go b/secrets/client.go
new file mode 100644
index 0000000..7a1f51b
--- /dev/null
+++ b/secrets/client.go
@@ -0,0 +1,112 @@
+package secrets
+
+import (
+        "context"
+        "crypto/rsa"
+        "crypto/x509"
+        "encoding/base64"
+        "fmt"
+        "sync"
+        "time"
+
+        "code.crute.us/mcrute/golib/log"
+        "code.crute.us/mcrute/golib/service"
+)
+
+type Handle interface {
+        Reference() string
+}
+
+type Renewal struct {
+        Name     string
+        Critical bool
+        Time     time.Time
+        Error    error
+}
+
+type Credential struct {
+        Username string `json:"username"`
+        Password string `json:"password"`
+}
+
+type ApiKey struct {
+        Key string `json:"key"`
+}
+
+type RSAKey struct {
+        Key string `json:"key"`
+}
+
+func (k *RSAKey) RSAPrivateKey() (*rsa.PrivateKey, error) {
+        der, err := base64.StdEncoding.DecodeString(k.Key)
+        if err != nil {
+                return nil, err
+        }
+
+        pr, err := x509.ParsePKCS8PrivateKey(der)
+        if err != nil {
+                return nil, err
+        }
+
+        pk, ok := pr.(*rsa.PrivateKey)
+        if !ok {
+                return nil, fmt.Errorf("RSAKey: parsed key is not an rsa.PrivateKey")
+        }
+
+        return pk, nil
+}
+
+// Client is the interface that users of secrets returned by a secret
+// back-end should expect. This interface contains only secret related
+// functionality and none of the functions for running the back-end
+// itself. This is separate from the manager functions to make it easier
+// to inject stubs to code that doesn't care about the fact that a
+// manager may exist.
+type Client interface {
+        DatabaseCredential(context.Context, string) (*Credential, Handle, error)
+        Secret(context.Context, string, any) (Handle, error)
+        WriteSecret(context.Context, string, any) error
+        Destroy(Handle) error
+        MakeNonCritical(Handle) error
+}
+
+// ClientManager is like a Client, and contains a Client, but also
+// contains other runtime functionality for running the secret back-end
+// infrastructure that most consumers of secretes don't care about but
+// the main process runner does.
+type ClientManager interface {
+        Client
+        Authenticate(context.Context) error
+        Notifications() <-chan Renewal
+        Run(context.Context, *sync.WaitGroup) error
+}
+
+// MakeRenewalLogger subscribes to a ClientManager notification channel
+// and logs those to the logger. If a critical credential fails the
+// terminator callback will be called which should shut down the
+// application in an orderly fashion.
+func MakeRenewalLogger(cm ClientManager, log log.LeveledLogger, terminator func()) service.RunnerFunc {
+        return func(ctx context.Context, wg *sync.WaitGroup) error {
+                wg.Add(1)
+                defer wg.Done()
+
+                for {
+                        select {
+                        case r := <-cm.Notifications():
+                                if r.Error != nil {
+                                        if r.Critical {
+                                                log.Errorf("Failed to renew critical secret %s due to %s", r.Name, r.Error)
+                                                terminator()
+                                        } else {
+                                                log.Errorf("Failed to renew non-critical secret %s", r.Name)
+                                        }
+                                } else {
+                                        log.Infof("Renewing credential %s", r.Name)
+                                }
+                        case <-ctx.Done():
+                                log.Infof("Shutting down secret renewal logger")
+                                return nil
+                        }
+                }
+        }
+}
diff --git a/secrets/go.mod b/secrets/go.mod
new file mode 100644
index 0000000..ca23257
--- /dev/null
+++ b/secrets/go.mod
@@ -0,0 +1,56 @@
+module code.crute.us/mcrute/golib/secrets
+
+go 1.18
+
+require (
+        code.crute.us/mcrute/golib v0.4.0
+        github.com/hashicorp/vault/api v1.8.0
+        github.com/hashicorp/vault/api/auth/approle v0.3.0
+        github.com/mitchellh/mapstructure v1.5.0
+)
+
+require (
+        github.com/armon/go-metrics v0.3.9 // indirect
+        github.com/armon/go-radix v1.0.0 // indirect
+        github.com/cenkalti/backoff/v3 v3.0.0 // indirect
+        github.com/fatih/color v1.7.0 // indirect
+        github.com/golang/protobuf v1.5.2 // indirect
+        github.com/golang/snappy v0.0.4 // indirect
+        github.com/hashicorp/errwrap v1.1.0 // indirect
+        github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
+        github.com/hashicorp/go-hclog v0.16.2 // indirect
+        github.com/hashicorp/go-immutable-radix v1.3.1 // indirect
+        github.com/hashicorp/go-multierror v1.1.1 // indirect
+        github.com/hashicorp/go-plugin v1.4.3 // indirect
+        github.com/hashicorp/go-retryablehttp v0.6.6 // indirect
+        github.com/hashicorp/go-rootcerts v1.0.2 // indirect
+        github.com/hashicorp/go-secure-stdlib/mlock v0.1.1 // indirect
+        github.com/hashicorp/go-secure-stdlib/parseutil v0.1.6 // indirect
+        github.com/hashicorp/go-secure-stdlib/strutil v0.1.2 // indirect
+        github.com/hashicorp/go-sockaddr v1.0.2 // indirect
+        github.com/hashicorp/go-uuid v1.0.2 // indirect
+        github.com/hashicorp/go-version v1.2.0 // indirect
+        github.com/hashicorp/golang-lru v0.5.4 // indirect
+        github.com/hashicorp/hcl v1.0.0 // indirect
+        github.com/hashicorp/vault/sdk v0.6.0 // indirect
+        github.com/hashicorp/yamux v0.0.0-20180604194846-3520598351bb // indirect
+        github.com/mattn/go-colorable v0.1.6 // indirect
+        github.com/mattn/go-isatty v0.0.12 // indirect
+        github.com/mitchellh/copystructure v1.0.0 // indirect
+        github.com/mitchellh/go-homedir v1.1.0 // indirect
+        github.com/mitchellh/go-testing-interface v1.0.0 // indirect
+        github.com/mitchellh/reflectwalk v1.0.0 // indirect
+        github.com/oklog/run v1.0.0 // indirect
+        github.com/pierrec/lz4 v2.5.2+incompatible // indirect
+        github.com/ryanuber/go-glob v1.0.0 // indirect
+        go.uber.org/atomic v1.9.0 // indirect
+        golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect
+        golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 // indirect
+        golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c // indirect
+        golang.org/x/text v0.3.3 // indirect
+        golang.org/x/time v0.0.0-20200416051211-89c76fbcd5d1 // indirect
+        google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013 // indirect
+        google.golang.org/grpc v1.41.0 // indirect
+        google.golang.org/protobuf v1.26.0 // indirect
+        gopkg.in/square/go-jose.v2 v2.5.1 // indirect
+)
diff --git a/secrets/go.sum b/secrets/go.sum
new file mode 100644
index 0000000..b27d5e2
--- /dev/null
+++ b/secrets/go.sum
@@ -0,0 +1,336 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+code.crute.us/mcrute/golib v0.4.0 h1:VWxb7v4gGkqL700zxDwgROweBsfx5RbiB35VW0O0oi0=
+code.crute.us/mcrute/golib v0.4.0/go.mod h1:dukLPhs1H8dxtkhXtpJZYo/bMzefLRbdRj9Tj67wdaQ=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/DataDog/datadog-go v3.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
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+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
+github.com/armon/go-metrics v0.3.9 h1:O2sNqxBdvq8Eq5xmzljcYzAORli6RWCvEym4cJf9m18=
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diff --git a/secrets/vault_client.go b/secrets/vault_client.go
new file mode 100644
index 0000000..3466f48
--- /dev/null
+++ b/secrets/vault_client.go
@@ -0,0 +1,426 @@
+package secrets
+
+import (
+        "container/heap"
+        "context"
+        "encoding/json"
+        "errors"
+        "fmt"
+        "net/http"
+        "path"
+        "sync"
+        "time"
+
+        glos "code.crute.us/mcrute/golib/os"
+
+        "github.com/hashicorp/vault/api"
+        "github.com/hashicorp/vault/api/auth/approle"
+        "github.com/mitchellh/mapstructure"
+)
+
+const (
+        renewalStartPercent = 0.8
+        notificationChanLen = 100
+        defaultIncrement    = 30 * 60 // 30 minutes (as seconds)
+        defaultTimeout      = 10 * time.Second
+        renewalWindow       = 30 * time.Second
+)
+
+type vaultRenewalMinHeap []*VaultHandle
+
+func (h vaultRenewalMinHeap) Len() int           { return len(h) }
+func (h vaultRenewalMinHeap) Less(i, j int) bool { return h[i].renewAfter() < h[j].renewAfter() }
+func (h vaultRenewalMinHeap) Swap(i, j int)      { h[i], h[j] = h[j], h[i] }
+func (h *vaultRenewalMinHeap) Push(x any)        { *h = append(*h, x.(*VaultHandle)) }
+func (h vaultRenewalMinHeap) Root() *VaultHandle { return h[0] }
+
+// Convenience methods to hide the collections/heap stuff from users
+func (h *vaultRenewalMinHeap) PopHeap() *VaultHandle   { return heap.Pop(h).(*VaultHandle) }
+func (h *vaultRenewalMinHeap) PushHeap(i *VaultHandle) { heap.Push(h, i) }
+func (h *vaultRenewalMinHeap) Init()                   { heap.Init(h) }
+
+func (h *vaultRenewalMinHeap) Pop() any {
+        old := *h
+        n := len(old)
+        item := old[n-1]
+        old[n-1] = nil // avoid memory leak
+        *h = old[0 : n-1]
+        return item
+}
+
+func (h *vaultRenewalMinHeap) FindRemove(handle *VaultHandle) bool {
+        for i, hnd := range *h {
+                if hnd.name == handle.name {
+                        heap.Remove(h, i)
+                        return true
+                }
+        }
+        return false
+}
+
+type VaultHandle struct {
+        name     string
+        critical bool
+        acquired time.Time
+        secret   *api.Secret
+}
+
+var _ Handle = (*VaultHandle)(nil)
+
+func (h *VaultHandle) isAuthToken() bool {
+        return h.secret.Auth != nil
+}
+
+func (h *VaultHandle) renewAfter() time.Duration {
+        after := float64(h.leaseDuration().Nanoseconds()) * renewalStartPercent
+        afterTime := h.acquired.Add(time.Duration(after))
+        return afterTime.Sub(time.Now()).Round(time.Second)
+}
+
+func (h *VaultHandle) leaseDuration() time.Duration {
+        duration := time.Duration(h.secret.LeaseDuration) * time.Second
+        if h.isAuthToken() {
+                return time.Duration(h.secret.Auth.LeaseDuration) * time.Second
+        }
+        return duration
+}
+
+func (h *VaultHandle) renew(ctx context.Context, c VaultServiceClient, inc int) (err error) {
+        var s *api.Secret
+
+        vctx, cancel := context.WithTimeout(ctx, defaultTimeout)
+        defer cancel()
+
+        if h.isAuthToken() {
+                s, err = c.Auth().Token().RenewTokenAsSelfWithContext(vctx, h.secret.Auth.ClientToken, inc)
+                if err != nil {
+                        return err
+                }
+        } else {
+                s, err = c.Sys().RenewWithContext(vctx, h.secret.LeaseID, inc)
+                if err != nil {
+                        return err
+                }
+        }
+
+        h.secret = s
+        h.acquired = time.Now()
+
+        return nil
+}
+
+func (h *VaultHandle) Reference() string {
+        return h.name
+}
+
+type VaultServiceClient interface {
+        Auth() *api.Auth
+        Sys() *api.Sys
+        Token() string
+}
+
+type VaultClient struct {
+        sync.Mutex
+
+        client         VaultServiceClient
+        logical        *api.Logical
+        auth           *approle.AppRoleAuth
+        secrets        vaultRenewalMinHeap
+        renewIncrement int
+        notifications  chan Renewal
+}
+
+var _ Client = (*VaultClient)(nil)
+var _ ClientManager = (*VaultClient)(nil)
+
+type VaultClientConfig struct {
+        Host        string `env:"VAULT_ADDR"`
+        Token       string `env:"VAULT_TOKEN"`
+        RoleId      string `env:"VAULT_ROLE_ID"`
+        RoleSecret  string `env:"VAULT_SECRET_ID"`
+        Increment   int    `env:"VAULT_INCREMENT"`
+        AppRoleAuth *approle.AppRoleAuth
+}
+
+func (c *VaultClientConfig) Validate() error {
+        if c.Host == "" {
+                return fmt.Errorf("VaultClientConfig: Vault host is not specified")
+        }
+
+        // The presence of a token is always assumed to be valid, client errors
+        // will occur otherwise.
+        if c.Token != "" {
+                return nil
+        }
+
+        // This constructor does a bunch of validation internally so just let
+        // it do its thing and return any errors from that directly to the
+        // user.
+        ar, err := approle.NewAppRoleAuth(c.RoleId, &approle.SecretID{FromString: c.RoleSecret})
+        if err != nil {
+                return fmt.Errorf("VaultClientConfig: AppRole credentials invalid: %w", err)
+        }
+        c.AppRoleAuth = ar
+
+        return nil
+}
+
+// NewVaultClient will attempt to create a secrets.Client from the
+// passed config. Config can be nil, in which case an attempt will
+// be made to load the configuration from environment variables. See
+// VaultClientConfig for the expected names of those variables.
+func NewVaultClient(cfg *VaultClientConfig) (ClientManager, error) {
+        if cfg == nil {
+                cfg = &VaultClientConfig{}
+        }
+
+        if err := glos.UnmarshalEnvironment(cfg); err != nil {
+                return nil, err
+        }
+
+        if err := cfg.Validate(); err != nil {
+                return nil, err
+        }
+
+        vc, err := api.NewClient(api.DefaultConfig())
+        if err != nil {
+                return nil, fmt.Errorf("NewVaultClient: error building client config: %w", err)
+        }
+        vc.SetAddress(cfg.Host)
+
+        if cfg.Token != "" {
+                vc.SetToken(cfg.Token)
+        }
+
+        c := &VaultClient{
+                client:         vc,
+                logical:        vc.Logical(),
+                secrets:        vaultRenewalMinHeap{},
+                notifications:  make(chan Renewal, notificationChanLen),
+                auth:           cfg.AppRoleAuth,
+                renewIncrement: cfg.Increment,
+        }
+
+        c.secrets.Init()
+
+        if c.renewIncrement == 0 {
+                c.renewIncrement = defaultIncrement
+        }
+
+        return c, nil
+}
+
+func (c *VaultClient) Notifications() <-chan Renewal {
+        return c.notifications
+}
+
+func (c *VaultClient) Authenticate(ctx context.Context) error {
+        if c.auth == nil {
+                return c.authToken(ctx)
+        } else {
+                return c.authAppRole(ctx)
+        }
+}
+
+func (c *VaultClient) authToken(ctx context.Context) error {
+        if c.client.Token() == "" {
+                return fmt.Errorf("Authenticate: unable to authenticate, neither token nor approle provided")
+        }
+
+        vctx, cancel := context.WithTimeout(ctx, defaultTimeout)
+        defer cancel()
+
+        secret, err := c.client.Auth().Token().LookupSelfWithContext(vctx)
+        if err != nil {
+                return err
+        }
+
+        // Looking up self does not return an auth token just a map of data
+        // about the current token. Convert this into a SecretAuth so that
+        // downstream renewal code does the right thing.
+        secret.Auth = &api.SecretAuth{}
+        if err := mapstructure.Decode(secret.Data, secret.Auth); err != nil {
+                return err
+        }
+        secret.Auth.ClientToken = c.client.Token()
+
+        c.makeHandle("login", secret)
+
+        return nil
+}
+
+func (c *VaultClient) authAppRole(ctx context.Context) error {
+        vctx, cancel := context.WithTimeout(ctx, defaultTimeout)
+        defer cancel()
+
+        s, err := c.client.Auth().Login(vctx, c.auth)
+        if err != nil {
+                return fmt.Errorf("Authenticate: error logging in to vault: %w", err)
+        }
+        c.makeHandle("login", s)
+        return err
+}
+
+// makeHandle creates a secret handle and schedules it for renewal if it
+// is renewable.
+func (c *VaultClient) makeHandle(name string, s *api.Secret) Handle {
+        h := &VaultHandle{
+                name:     name,
+                critical: true, // Everything is critical unless marked otherwise
+                acquired: time.Now(),
+                secret:   s,
+        }
+
+        // If this is renewable then schedule it for renewal
+        if (s.Auth != nil && s.Auth.Renewable) || s.Renewable {
+                c.Lock()
+                c.secrets.PushHeap(h)
+                c.Unlock()
+        }
+
+        return h
+}
+
+func (c *VaultClient) read(ctx context.Context, prefix, suffix string) (Handle, error) {
+        key := path.Join(prefix, suffix)
+
+        s, err := c.logical.ReadWithContext(ctx, key)
+        if err != nil {
+                return nil, fmt.Errorf("read: error reading from Vault: %w", err)
+        }
+
+        return c.makeHandle(key, s), nil
+}
+
+func (c *VaultClient) isRecoverableDbError(err error) bool {
+        var apiErr *api.ResponseError
+        return errors.Is(api.ErrSecretNotFound, err) ||
+                (errors.As(err, &apiErr) && apiErr.StatusCode == http.StatusForbidden)
+}
+
+func (c *VaultClient) DatabaseCredential(ctx context.Context, suffix string) (*Credential, Handle, error) {
+        cred, hnd, err := c.databaseCredentialDynamic(ctx, suffix)
+        if err != nil {
+                if c.isRecoverableDbError(err) {
+                        cred, hnd, err = c.databaseCredentialStatic(ctx, suffix)
+                }
+        }
+        return cred, hnd, err
+}
+
+func (c *VaultClient) databaseCredentialDynamic(ctx context.Context, suffix string) (*Credential, Handle, error) {
+        h, err := c.read(ctx, "database/creds", suffix)
+        if err != nil {
+                return nil, nil, err
+        }
+        vh := h.(*VaultHandle)
+
+        var d Credential
+        if err = mapstructure.Decode(vh.secret.Data, &d); err != nil {
+                return nil, nil, fmt.Errorf("databaseCredentialStatic: error decoding secret: %w", err)
+        }
+
+        return &d, h, nil
+}
+
+func (c *VaultClient) databaseCredentialStatic(ctx context.Context, suffix string) (*Credential, Handle, error) {
+        h, err := c.read(ctx, "database/static-creds", suffix)
+        if err != nil {
+                return nil, nil, err
+        }
+
+        var d Credential
+        if err = mapstructure.Decode(h.(*VaultHandle).secret.Data, &d); err != nil {
+                return nil, nil, fmt.Errorf("databaseCredentialStatic: error decoding secret: %w", err)
+        }
+
+        return &d, h, nil
+}
+
+func (c *VaultClient) Secret(ctx context.Context, suffix string, out any) (Handle, error) {
+        h, err := c.read(ctx, "kv/data", suffix)
+        if err != nil {
+                return nil, err
+        }
+
+        if err = mapstructure.Decode(h.(*VaultHandle).secret.Data["data"], out); err != nil {
+                return nil, err
+        }
+
+        return h, nil
+}
+
+func (c *VaultClient) WriteSecret(ctx context.Context, suffix string, in any) error {
+        inb, err := json.Marshal(in)
+        if err != nil {
+                return fmt.Errorf("WriteSecret: error encoding json: %w", err)
+        }
+
+        if _, err = c.logical.WriteBytesWithContext(ctx, path.Join("kv/data", suffix), inb); err != nil {
+                return fmt.Errorf("WriteSecret: error writing to vault: %w", err)
+        }
+
+        return nil
+}
+
+func (c *VaultClient) Destroy(h Handle) error {
+        c.Lock()
+        defer c.Unlock()
+
+        c.secrets.FindRemove(h.(*VaultHandle))
+
+        return nil
+}
+
+func (c *VaultClient) MakeNonCritical(h Handle) error {
+        h.(*VaultHandle).critical = false
+        return nil
+}
+
+func (c *VaultClient) renewAttempt(ctx context.Context) (next time.Duration) {
+        c.Lock()
+        defer c.Unlock()
+
+        // In the absence of any other time, run once a second
+        next = 5 * time.Second
+
+        if c.secrets.Len() < 1 {
+                return
+        }
+
+        for {
+                s := c.secrets.PopHeap()
+                if s.renewAfter() < renewalWindow {
+                        // Underlying client does backoff and retry
+                        c.notifications <- Renewal{
+                                Name:     s.name,
+                                Critical: s.critical,
+                                Time:     time.Now(),
+                                Error:    s.renew(ctx, c.client, c.renewIncrement),
+                        }
+                        c.secrets.PushHeap(s)
+                } else {
+                        c.secrets.PushHeap(s)
+                        next = c.secrets.Root().renewAfter()
+                        break
+                }
+        }
+
+        return next
+}
+
+func (c *VaultClient) Run(ctx context.Context, wg *sync.WaitGroup) error {
+        wg.Add(1)
+        defer wg.Done()
+
+        for {
+                sleepTime := c.renewAttempt(ctx)
+
+                select {
+                case <-time.After(sleepTime):
+                        continue
+                case <-ctx.Done():
+                        return nil
+                }
+        }
+}