From 6a68e49c503416e6fbe7a6241005ba207f253a0d Mon Sep 17 00:00:00 2001 From: Mike Crute Date: Wed, 23 Nov 2022 13:33:18 -0800 Subject: secrets: introduce new secrets subsystem --- secrets/client.go | 112 +++++++++++++ secrets/go.mod | 56 +++++++ secrets/go.sum | 336 ++++++++++++++++++++++++++++++++++++++ secrets/vault_client.go | 426 ++++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 930 insertions(+) create mode 100644 secrets/client.go create mode 100644 secrets/go.mod create mode 100644 secrets/go.sum create mode 100644 secrets/vault_client.go (limited to 'secrets') 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 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+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= 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 + } + } +} -- cgit v1.2.3