diff --git a/builtin/logical/pki/backend.go b/builtin/logical/pki/backend.go index 75fd4e83395c..900bcaa31162 100644 --- a/builtin/logical/pki/backend.go +++ b/builtin/logical/pki/backend.go @@ -147,6 +147,11 @@ func Backend(conf *logical.BackendConfig) *backend { unifiedDeltaWALPath, }, + Limited: []string{ + "issue", + "issue/*", + }, + Binary: []string{ "ocsp", // OCSP POST "ocsp/*", // OCSP GET diff --git a/changelog/25093.txt b/changelog/25093.txt new file mode 100644 index 000000000000..3deea016bd98 --- /dev/null +++ b/changelog/25093.txt @@ -0,0 +1,5 @@ +```release-note:feature +**Request Limiter**: Add adaptive concurrency limits to write-based HTTP +methods and special-case `pki/issue` requests to prevent overloading the Vault +server. +``` diff --git a/go.mod b/go.mod index 317d05ad1a22..57ed1826485a 100644 --- a/go.mod +++ b/go.mod @@ -191,6 +191,7 @@ require ( github.com/patrickmn/go-cache v2.1.0+incompatible github.com/pires/go-proxyproto v0.6.1 github.com/pkg/errors v0.9.1 + github.com/platinummonkey/go-concurrency-limits v0.7.0 github.com/posener/complete v1.2.3 github.com/pquerna/otp v1.2.1-0.20191009055518-468c2dd2b58d github.com/prometheus/client_golang v1.14.0 diff --git a/go.sum b/go.sum index 845f3ee44ea3..4366d98f14f8 100644 --- a/go.sum +++ b/go.sum @@ -1039,6 +1039,7 @@ github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym github.com/DataDog/datadog-go v2.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ= github.com/DataDog/datadog-go v3.2.0+incompatible h1:qSG2N4FghB1He/r2mFrWKCaL7dXCilEuNEeAn20fdD4= github.com/DataDog/datadog-go v3.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ= +github.com/DataDog/datadog-go/v5 v5.0.2/go.mod h1:ZI9JFB4ewXbw1sBnF4sxsR2k1H3xjV+PUAOUsHvKpcU= github.com/HdrHistogram/hdrhistogram-go v1.1.2/go.mod h1:yDgFjdqOqDEKOvasDdhWNXYg9BVp4O+o5f6V/ehm6Oo= github.com/Jeffail/gabs v1.1.1 h1:V0uzR08Hj22EX8+8QMhyI9sX2hwRu+/RJhJUmnwda/E= github.com/Jeffail/gabs v1.1.1/go.mod h1:6xMvQMK4k33lb7GUUpaAPh6nKMmemQeg5d4gn7/bOXc= @@ -1063,6 +1064,7 @@ github.com/Microsoft/go-winio v0.4.16/go.mod h1:XB6nPKklQyQ7GC9LdcBEcBl8PF76WugX github.com/Microsoft/go-winio v0.4.17-0.20210211115548-6eac466e5fa3/go.mod h1:JPGBdM1cNvN/6ISo+n8V5iA4v8pBzdOpzfwIujj1a84= github.com/Microsoft/go-winio v0.4.17-0.20210324224401-5516f17a5958/go.mod h1:JPGBdM1cNvN/6ISo+n8V5iA4v8pBzdOpzfwIujj1a84= github.com/Microsoft/go-winio v0.4.17/go.mod h1:JPGBdM1cNvN/6ISo+n8V5iA4v8pBzdOpzfwIujj1a84= +github.com/Microsoft/go-winio v0.5.0/go.mod h1:JPGBdM1cNvN/6ISo+n8V5iA4v8pBzdOpzfwIujj1a84= github.com/Microsoft/go-winio v0.5.1/go.mod h1:JPGBdM1cNvN/6ISo+n8V5iA4v8pBzdOpzfwIujj1a84= github.com/Microsoft/go-winio v0.5.2/go.mod h1:WpS1mjBmmwHBEWmogvA2mj8546UReBk4v8QkMxJ6pZY= github.com/Microsoft/go-winio v0.6.0/go.mod h1:cTAf44im0RAYeL23bpB+fzCyDH2MJiz2BO69KH/soAE= @@ -2879,6 +2881,8 @@ github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4= github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0= github.com/pkg/sftp v1.10.1/go.mod h1:lYOWFsE0bwd1+KfKJaKeuokY15vzFx25BLbzYYoAxZI= github.com/pkg/sftp v1.13.1/go.mod h1:3HaPG6Dq1ILlpPZRO0HVMrsydcdLt6HRDccSgb87qRg= +github.com/platinummonkey/go-concurrency-limits v0.7.0 h1:Bl9E74+67BrlRLBeryHOaFy0e1L3zD9g436/3vo6akQ= +github.com/platinummonkey/go-concurrency-limits v0.7.0/go.mod h1:Xxr6BywMVH3QyLyd0PanLnkkkmByTTPET3azMpdfmng= github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U= github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= @@ -2947,6 +2951,7 @@ github.com/prometheus/procfs v0.8.0/go.mod h1:z7EfXMXOkbkqb9IINtpCn86r/to3BnA0ua github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU= github.com/rboyer/safeio v0.2.1 h1:05xhhdRNAdS3apYm7JRjOqngf4xruaW959jmRxGDuSU= github.com/rboyer/safeio v0.2.1/go.mod h1:Cq/cEPK+YXFn622lsQ0K4KsPZSPtaptHHEldsy7Fmig= +github.com/rcrowley/go-metrics v0.0.0-20180503174638-e2704e165165/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4= github.com/rcrowley/go-metrics v0.0.0-20200313005456-10cdbea86bc0/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4= github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo= github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo= diff --git a/http/handler.go b/http/handler.go index d2c36e0d7398..c6efbe5d5154 100644 --- a/http/handler.go +++ b/http/handler.go @@ -30,6 +30,7 @@ import ( "github.com/hashicorp/go-uuid" "github.com/hashicorp/vault/helper/namespace" "github.com/hashicorp/vault/internalshared/configutil" + "github.com/hashicorp/vault/limits" "github.com/hashicorp/vault/sdk/helper/consts" "github.com/hashicorp/vault/sdk/helper/jsonutil" "github.com/hashicorp/vault/sdk/helper/pathmanager" @@ -908,10 +909,47 @@ func forwardRequest(core *vault.Core, w http.ResponseWriter, r *http.Request) { w.Write(retBytes) } +func acquireLimiterListener(core *vault.Core, rawReq *http.Request, r *logical.Request) (*limits.RequestListener, bool) { + lim := &limits.RequestLimiter{} + if r.PathLimited { + lim = core.GetRequestLimiter(limits.SpecialPathLimiter) + } else { + switch rawReq.Method { + case http.MethodGet, http.MethodHead, http.MethodTrace, http.MethodOptions: + // We're only interested in the inverse, so do nothing here. + default: + lim = core.GetRequestLimiter(limits.WriteLimiter) + } + } + return lim.Acquire(rawReq.Context()) +} + // request is a helper to perform a request and properly exit in the // case of an error. func request(core *vault.Core, w http.ResponseWriter, rawReq *http.Request, r *logical.Request) (*logical.Response, bool, bool) { + lsnr, ok := acquireLimiterListener(core, rawReq, r) + if !ok { + resp := &logical.Response{} + logical.RespondWithStatusCode(resp, r, http.StatusServiceUnavailable) + respondError(w, http.StatusServiceUnavailable, limits.ErrCapacity) + return resp, false, false + } + + // To guard against leaking RequestListener slots, we should ignore Limiter + // measurements on panic. OnIgnore will check to see if a RequestListener + // slot has been acquired and not released, which could happen on + // recoverable panics. + defer lsnr.OnIgnore() + resp, err := core.HandleRequest(rawReq.Context(), r) + + // Do the limiter measurement + if err != nil { + lsnr.OnDropped() + } else { + lsnr.OnSuccess() + } + if r.LastRemoteWAL() > 0 && !core.EntWaitUntilWALShipped(rawReq.Context(), r.LastRemoteWAL()) { if resp == nil { resp = &logical.Response{} diff --git a/http/logical.go b/http/logical.go index 4958ce5c14f4..f11cb959af95 100644 --- a/http/logical.go +++ b/http/logical.go @@ -7,6 +7,7 @@ import ( "bufio" "encoding/base64" "encoding/json" + "errors" "fmt" "io" "mime" @@ -18,6 +19,7 @@ import ( "github.com/hashicorp/go-uuid" "github.com/hashicorp/vault/helper/namespace" + "github.com/hashicorp/vault/limits" "github.com/hashicorp/vault/sdk/helper/consts" "github.com/hashicorp/vault/sdk/logical" "github.com/hashicorp/vault/vault" @@ -211,6 +213,10 @@ func buildLogicalRequestNoAuth(perfStandby bool, ra *vault.RouterAccess, w http. Headers: r.Header, } + if ra != nil && ra.IsLimitedPath(r.Context(), path) { + req.PathLimited = true + } + if passHTTPReq { req.HTTPRequest = r } @@ -378,6 +384,9 @@ func handleLogicalInternal(core *vault.Core, injectDataIntoTopLevel bool, noForw // success. resp, ok, needsForward := request(core, w, r, req) switch { + case errors.Is(resp.Error(), limits.ErrCapacity): + respondError(w, http.StatusServiceUnavailable, limits.ErrCapacity) + return case needsForward && noForward: respondError(w, http.StatusBadRequest, vault.ErrCannotForwardLocalOnly) return diff --git a/limits/limiter.go b/limits/limiter.go new file mode 100644 index 000000000000..d9758eaf711a --- /dev/null +++ b/limits/limiter.go @@ -0,0 +1,191 @@ +// Copyright (c) HashiCorp, Inc. +// SPDX-License-Identifier: BUSL-1.1 +package limits + +import ( + "context" + "errors" + "fmt" + "math" + "sync/atomic" + + "github.com/armon/go-metrics" + "github.com/hashicorp/go-hclog" + "github.com/platinummonkey/go-concurrency-limits/core" + "github.com/platinummonkey/go-concurrency-limits/limit" + "github.com/platinummonkey/go-concurrency-limits/limiter" + "github.com/platinummonkey/go-concurrency-limits/strategy" +) + +var ( + // ErrCapacity is a new error type to indicate that Vault is not accepting new + // requests. This should be handled by callers in request paths to return + // http.StatusServiceUnavailable to the client. + ErrCapacity = errors.New("Vault server temporarily overloaded") + + // DefaultDebugLogger opts out of the go-concurrency-limits internal Debug + // logger, since it's rather noisy. We're generating logs of interest in + // Vault. + DefaultDebugLogger limit.Logger = nil + + // DefaultMetricsRegistry opts out of the go-concurrency-limits internal + // metrics because we're tracking what we care about in Vault. + DefaultMetricsRegistry core.MetricRegistry = core.EmptyMetricRegistryInstance +) + +const ( + // Smoothing adjusts how heavily we weight newer high-latency detection. + // Higher values (>1) place more emphasis on recent measurements. We set + // this below 1 to better tolerate short-lived spikes in request rate. + DefaultSmoothing = .1 + + // DefaultLongWindow is chosen as a minimum of 1000 samples. longWindow + // defines sliding window size used for the Exponential Moving Average. + DefaultLongWindow = 1000 +) + +// RequestLimiter is a thin wrapper for limiter.DefaultLimiter. +type RequestLimiter struct { + *limiter.DefaultLimiter +} + +// Acquire consults the underlying RequestLimiter to see if a new +// RequestListener can be acquired. +// +// The return values are a *RequestListener, which the caller can use to perform +// latency measurements, and a bool to indicate whether or not a RequestListener +// was acquired. +// +// The returned RequestListener is short-lived and eventually garbage-collected; +// however, the RequestLimiter keeps track of in-flight concurrency using a +// token bucket implementation. The caller must release the resulting Limiter +// token by conducting a measurement. +// +// There are three return cases: +// +// 1) If Request Limiting is disabled, we return an empty RequestListener so all +// measurements are no-ops. +// +// 2) If the request limit has been exceeded, we will not acquire a +// RequestListener and instead return nil, false. No measurement is required, +// since we immediately return from callers with ErrCapacity. +// +// 3) If we have not exceeded the request limit, the caller must call one of +// OnSuccess(), OnDropped(), or OnIgnore() to return a measurement and release +// the underlying Limiter token. +func (l *RequestLimiter) Acquire(ctx context.Context) (*RequestListener, bool) { + // Transparently handle the case where the limiter is disabled. + if l == nil || l.DefaultLimiter == nil { + return &RequestListener{}, true + } + + lsnr, ok := l.DefaultLimiter.Acquire(ctx) + if !ok { + metrics.IncrCounter(([]string{"limits", "concurrency", "service_unavailable"}), 1) + // If the token acquisition fails, we've reached capacity and we won't + // get a listener, so just return nil. + return nil, false + } + + return &RequestListener{ + DefaultListener: lsnr.(*limiter.DefaultListener), + released: new(atomic.Bool), + }, true +} + +// concurrencyChanger adjusts the current allowed concurrency with an +// exponential backoff as we approach the max limit. +func concurrencyChanger(limit int) int { + change := math.Sqrt(float64(limit)) + if change < 1.0 { + change = 1.0 + } + return int(change) +} + +var ( + // DefaultWriteLimiterFlags have a less conservative MinLimit to prevent + // over-optimizing the request latency, which would result in + // under-utilization and client starvation. + DefaultWriteLimiterFlags = LimiterFlags{ + Name: WriteLimiter, + MinLimit: 100, + MaxLimit: 5000, + } + + // DefaultSpecialPathLimiterFlags have a conservative MinLimit to allow more + // aggressive concurrency throttling for CPU-bound workloads such as + // `pki/issue`. + DefaultSpecialPathLimiterFlags = LimiterFlags{ + Name: SpecialPathLimiter, + MinLimit: 5, + MaxLimit: 5000, + } +) + +// LimiterFlags establish some initial configuration for a new request limiter. +type LimiterFlags struct { + // Name specifies the limiter Name for registry lookup and logging. + Name string + + // MinLimit defines the minimum concurrency floor to prevent over-throttling + // requests during periods of high traffic. + MinLimit int + + // MaxLimit defines the maximum concurrency ceiling to prevent skewing to a + // point of no return. + // + // We set this to a high value (5000) with the expectation that systems with + // high-performing specs will tolerate higher limits, while the algorithm + // will find its own steady-state concurrency well below this threshold in + // most cases. + MaxLimit int + + // InitialLimit defines the starting concurrency limit prior to any + // measurements. + // + // If we start this value off too high, Vault could become + // overloaded before the algorithm has a chance to adapt. Setting the value + // to the minimum is a safety measure which could result in early request + // rejection; however, the adaptive nature of the algorithm will prevent + // this from being a prolonged state as the allowed concurrency will + // increase during normal operation. + InitialLimit int +} + +// NewRequestLimiter is a basic constructor for the RequestLimiter wrapper. It +// is responsible for setting up the Gradient2 Limit and instantiating a new +// wrapped DefaultLimiter. +func NewRequestLimiter(logger hclog.Logger, flags LimiterFlags) (*RequestLimiter, error) { + logger.Info("setting up new request limiter", + "initialLimit", flags.InitialLimit, + "maxLimit", flags.MaxLimit, + "minLimit", flags.MinLimit, + ) + + // NewGradient2Limit is the algorithm which drives request limiting + // decisions. It gathers latency measurements and calculates an Exponential + // Moving Average to determine whether latency deviation warrants a change + // in the current concurrency limit. + lim, err := limit.NewGradient2Limit(flags.Name, + flags.InitialLimit, + flags.MaxLimit, + flags.MinLimit, + concurrencyChanger, + DefaultSmoothing, + DefaultLongWindow, + DefaultDebugLogger, + DefaultMetricsRegistry, + ) + if err != nil { + return nil, fmt.Errorf("failed to create gradient2 limit: %w", err) + } + + strategy := strategy.NewSimpleStrategy(flags.InitialLimit) + defLimiter, err := limiter.NewDefaultLimiter(lim, 1e9, 1e9, 10, 100, strategy, nil, DefaultMetricsRegistry) + if err != nil { + return &RequestLimiter{}, err + } + + return &RequestLimiter{defLimiter}, nil +} diff --git a/limits/listener.go b/limits/listener.go new file mode 100644 index 000000000000..1d27b7d897c8 --- /dev/null +++ b/limits/listener.go @@ -0,0 +1,51 @@ +// Copyright (c) HashiCorp, Inc. +// SPDX-License-Identifier: BUSL-1.1 +package limits + +import ( + "sync/atomic" + + "github.com/armon/go-metrics" + "github.com/platinummonkey/go-concurrency-limits/limiter" +) + +// RequestListener is a thin wrapper for limiter.DefaultLimiter to handle the +// case where request limiting is turned off. +type RequestListener struct { + *limiter.DefaultListener + released *atomic.Bool +} + +// OnSuccess is called as a notification that the operation succeeded and +// internally measured latency should be used as an RTT sample. +func (l *RequestListener) OnSuccess() { + if l.DefaultListener != nil { + metrics.IncrCounter(([]string{"limits", "concurrency", "success"}), 1) + l.DefaultListener.OnSuccess() + l.released.Store(true) + } +} + +// OnDropped is called to indicate the request failed and was dropped due to an +// internal server error. Note that this does not include ErrCapacity. +func (l *RequestListener) OnDropped() { + if l.DefaultListener != nil { + metrics.IncrCounter(([]string{"limits", "concurrency", "dropped"}), 1) + l.DefaultListener.OnDropped() + l.released.Store(true) + } +} + +// OnIgnore is called to indicate the operation failed before any meaningful RTT +// measurement could be made and should be ignored to not introduce an +// artificially low RTT. It also provides an extra layer of protection against +// leaks of the underlying StrategyToken during recoverable panics in the +// request handler. We treat these as Ignored, discard the measurement, and mark +// the listener as released. +func (l *RequestListener) OnIgnore() { + if l.DefaultListener != nil && l.released.Load() != true { + metrics.IncrCounter(([]string{"limits", "concurrency", "ignored"}), 1) + l.DefaultListener.OnIgnore() + l.released.Store(true) + } +} diff --git a/limits/registry.go b/limits/registry.go new file mode 100644 index 000000000000..9e92a8df34ab --- /dev/null +++ b/limits/registry.go @@ -0,0 +1,203 @@ +// Copyright (c) HashiCorp, Inc. +// SPDX-License-Identifier: BUSL-1.1 +package limits + +import ( + "os" + "strconv" + "sync" + + "github.com/hashicorp/go-hclog" +) + +const ( + WriteLimiter = "write" + SpecialPathLimiter = "special-path" + LimitsBadEnvVariable = "failed to process limiter environment variable, using default" +) + +// NOTE: Great care should be taken when setting any of these variables to avoid +// adverse affects in optimal request servicing. It is strongly advised that +// these variables not be used unless there is a very good reason. These are +// intentionally undocumented environment variables that may be removed in +// future versions of Vault. +const ( + // EnvVaultDisableWriteLimiter is used to turn off the + // RequestLimiter for write-based HTTP methods. + EnvVaultDisableWriteLimiter = "VAULT_DISABLE_WRITE_LIMITER" + + // EnvVaultWriteLimiterMin is used to modify the minimum + // concurrency limit for write-based HTTP methods. + EnvVaultWriteLimiterMin = "VAULT_WRITE_LIMITER_MIN" + + // EnvVaultWriteLimiterMax is used to modify the maximum + // concurrency limit for write-based HTTP methods. + EnvVaultWriteLimiterMax = "VAULT_WRITE_LIMITER_MAX" + + // EnvVaultDisablePathBasedRequestLimiting is used to turn off the + // RequestLimiter for special-cased paths, specified in + // Backend.PathsSpecial. + EnvVaultDisableSpecialPathLimiter = "VAULT_DISABLE_SPECIAL_PATH_LIMITER" + + // EnvVaultSpecialPathLimiterMin is used to modify the minimum + // concurrency limit for write-based HTTP methods. + EnvVaultSpecialPathLimiterMin = "VAULT_SPECIAL_PATH_LIMITER_MIN" + + // EnvVaultSpecialPathLimiterMax is used to modify the maximum + // concurrency limit for write-based HTTP methods. + EnvVaultSpecialPathLimiterMax = "VAULT_SPECIAL_PATH_LIMITER_MAX" +) + +// LimiterRegistry holds the map of RequestLimiters mapped to keys. +type LimiterRegistry struct { + Limiters map[string]*RequestLimiter + Logger hclog.Logger + Enabled bool + sync.RWMutex +} + +// NewLimiterRegistry is a basic LimiterRegistry constructor. +func NewLimiterRegistry(logger hclog.Logger) *LimiterRegistry { + return &LimiterRegistry{ + Limiters: make(map[string]*RequestLimiter), + Logger: logger, + } +} + +// processEnvVars consults Limiter-specific environment variables and tells the +// caller if the Limiter should be disabled. If not, it adjusts the passed-in +// limiterFlags as appropriate. +func (r *LimiterRegistry) processEnvVars(flags *LimiterFlags, envDisabled, envMin, envMax string) bool { + envFlagsLogger := r.Logger.With("name", flags.Name) + if disabledRaw := os.Getenv(envDisabled); disabledRaw != "" { + disabled, err := strconv.ParseBool(disabledRaw) + if err != nil { + envFlagsLogger.Warn(LimitsBadEnvVariable, + "env", envDisabled, + "val", disabledRaw, + "default", false, + "error", err, + ) + } + + if disabled { + envFlagsLogger.Warn("limiter disabled by environment variable", "env", envDisabled, "val", disabledRaw) + return true + } + } + + envFlags := &LimiterFlags{} + if minRaw := os.Getenv(envMin); minRaw != "" { + min, err := strconv.Atoi(minRaw) + if err != nil { + envFlagsLogger.Warn(LimitsBadEnvVariable, + "env", envMin, + "val", minRaw, + "default", flags.MinLimit, + "error", err, + ) + } else { + envFlags.MinLimit = min + } + } + + if maxRaw := os.Getenv(envMax); maxRaw != "" { + max, err := strconv.Atoi(maxRaw) + if err != nil { + envFlagsLogger.Warn(LimitsBadEnvVariable, + "env", envMax, + "val", maxRaw, + "default", flags.MaxLimit, + "error", err, + ) + } else { + envFlags.MaxLimit = max + } + } + + switch { + case envFlags.MinLimit == 0: + // Assume no environment variable was provided. + case envFlags.MinLimit > 0: + flags.MinLimit = envFlags.MinLimit + default: + r.Logger.Warn("min limit must be greater than zero, falling back to defaults", "minLimit", flags.MinLimit) + } + + switch { + case envFlags.MaxLimit == 0: + // Assume no environment variable was provided. + case envFlags.MaxLimit > flags.MinLimit: + flags.MaxLimit = envFlags.MaxLimit + default: + r.Logger.Warn("max limit must be greater than min, falling back to defaults", "maxLimit", flags.MaxLimit) + } + + return false +} + +// Enable sets up a new LimiterRegistry and marks it Enabled. +func (r *LimiterRegistry) Enable() { + r.Lock() + defer r.Unlock() + + if r.Enabled { + return + } + + r.Logger.Info("enabling request limiters") + r.Limiters = map[string]*RequestLimiter{} + r.Register(DefaultWriteLimiterFlags) + r.Register(DefaultSpecialPathLimiterFlags) + + r.Enabled = true +} + +// Register creates a new request limiter and assigns it a slot in the +// LimiterRegistry. Locking should be done in the caller. +func (r *LimiterRegistry) Register(flags LimiterFlags) { + var disabled bool + + switch flags.Name { + case WriteLimiter: + disabled = r.processEnvVars(&flags, + EnvVaultDisableWriteLimiter, + EnvVaultWriteLimiterMin, + EnvVaultWriteLimiterMax, + ) + if disabled { + return + } + case SpecialPathLimiter: + disabled = r.processEnvVars(&flags, + EnvVaultDisableSpecialPathLimiter, + EnvVaultSpecialPathLimiterMin, + EnvVaultSpecialPathLimiterMax, + ) + if disabled { + return + } + default: + r.Logger.Warn("skipping invalid limiter type", "key", flags.Name) + return + } + + // Always set the initial limit to min so the system can find its own + // equilibrium, since max might be too high. + flags.InitialLimit = flags.MinLimit + + limiter, err := NewRequestLimiter(r.Logger.Named(flags.Name), flags) + if err != nil { + r.Logger.Error("failed to register limiter", "name", flags.Name, "error", err) + return + } + + r.Limiters[flags.Name] = limiter +} + +// GetLimiter looks up a RequestLimiter by key in the LimiterRegistry. +func (r *LimiterRegistry) GetLimiter(key string) *RequestLimiter { + r.RLock() + defer r.RUnlock() + return r.Limiters[key] +} diff --git a/sdk/logical/logical.go b/sdk/logical/logical.go index 223f46de8f6b..be527ba9e9c7 100644 --- a/sdk/logical/logical.go +++ b/sdk/logical/logical.go @@ -163,6 +163,17 @@ type Paths struct { // Binary paths are those whose request bodies should not be assumed to // be JSON encoded, and for which the backend will decode values for auditing Binary []string + + // Limited paths are storage paths that require special-cased request + // limiting. + // + // This was initially added to separate limiting of "write" requests + // (limits.WriteLimiter) from limiting for CPU-bound pki/issue requests + // (limits.SpecialPathLimiter). Other plugins might also choose to mark + // paths if they don't follow a typical resource usage pattern. + // + // For more details, consult limits/registry.go. + Limited []string } type Auditor interface { diff --git a/sdk/logical/request.go b/sdk/logical/request.go index 72bd615c8507..0faa6a59fae9 100644 --- a/sdk/logical/request.go +++ b/sdk/logical/request.go @@ -194,6 +194,10 @@ type Request struct { // accessible. Unauthenticated bool `json:"unauthenticated" structs:"unauthenticated" mapstructure:"unauthenticated"` + // PathLimited indicates that the request path is marked for special-case + // request limiting. + PathLimited bool `json:"path_limited" structs:"path_limited" mapstructure:"path_limited"` + // MFACreds holds the parsed MFA information supplied over the API as part of // X-Vault-MFA header MFACreds MFACreds `json:"mfa_creds" structs:"mfa_creds" mapstructure:"mfa_creds" sentinel:""` diff --git a/sdk/logical/response_util.go b/sdk/logical/response_util.go index 163f0b2538e0..2aebe3a43be4 100644 --- a/sdk/logical/response_util.go +++ b/sdk/logical/response_util.go @@ -207,7 +207,7 @@ func RespondErrorAndData(w http.ResponseWriter, status int, data interface{}, er type ErrorAndDataResponse struct { Errors []string `json:"errors"` - Data interface{} `json:"data""` + Data interface{} `json:"data"` } resp := &ErrorAndDataResponse{Errors: make([]string, 0, 1)} if err != nil { diff --git a/sdk/plugin/grpc_backend_server.go b/sdk/plugin/grpc_backend_server.go index eecb230fa61a..cdc19b604c25 100644 --- a/sdk/plugin/grpc_backend_server.go +++ b/sdk/plugin/grpc_backend_server.go @@ -198,6 +198,7 @@ func (b *backendGRPCPluginServer) SpecialPaths(ctx context.Context, args *pb.Emp SealWrapStorage: paths.SealWrapStorage, WriteForwardedStorage: paths.WriteForwardedStorage, Binary: paths.Binary, + Limited: paths.Limited, }, }, nil } diff --git a/sdk/plugin/pb/backend.pb.go b/sdk/plugin/pb/backend.pb.go index d741f0ca9365..cf5839cb1bf2 100644 --- a/sdk/plugin/pb/backend.pb.go +++ b/sdk/plugin/pb/backend.pb.go @@ -212,6 +212,10 @@ type Paths struct { // // See note in /sdk/logical/logical.go. Binary []string `protobuf:"bytes,6,rep,name=binary,proto3" json:"binary,omitempty"` + // Limited paths are storage paths that require special-case request limiting. + // + // See note in /sdk/logical/logical.go. + Limited []string `protobuf:"bytes,7,rep,name=limited,proto3" json:"limited,omitempty"` } func (x *Paths) Reset() { @@ -288,6 +292,13 @@ func (x *Paths) GetBinary() []string { return nil } +func (x *Paths) GetLimited() []string { + if x != nil { + return x.Limited + } + return nil +} + type Request struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache @@ -3716,7 +3727,7 @@ var file_sdk_plugin_pb_backend_proto_rawDesc = []byte{ 0x72, 0x54, 0x79, 0x70, 0x65, 0x12, 0x17, 0x0a, 0x07, 0x65, 0x72, 0x72, 0x5f, 0x6d, 0x73, 0x67, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x06, 0x65, 0x72, 0x72, 0x4d, 0x73, 0x67, 0x12, 0x19, 0x0a, 0x08, 0x65, 0x72, 0x72, 0x5f, 0x63, 0x6f, 0x64, 0x65, 0x18, 0x03, 0x20, 0x01, 0x28, 0x03, - 0x52, 0x07, 0x65, 0x72, 0x72, 0x43, 0x6f, 0x64, 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0x63, 0x6f, 0x72, 0x70, 0x2f, 0x76, 0x61, 0x75, + 0x6c, 0x74, 0x2f, 0x73, 0x64, 0x6b, 0x2f, 0x70, 0x6c, 0x75, 0x67, 0x69, 0x6e, 0x2f, 0x70, 0x62, + 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33, } var ( diff --git a/sdk/plugin/pb/backend.proto b/sdk/plugin/pb/backend.proto index 47fc6f9c7343..cf0f47d8dbe7 100644 --- a/sdk/plugin/pb/backend.proto +++ b/sdk/plugin/pb/backend.proto @@ -63,6 +63,11 @@ message Paths { // // See note in /sdk/logical/logical.go. repeated string binary = 6; + + // Limited paths are storage paths that require special-case request limiting. + // + // See note in /sdk/logical/logical.go. + repeated string limited = 7; } message Request { diff --git a/vault/core.go b/vault/core.go index 2b0cdbde43fd..c18ace3a0e8c 100644 --- a/vault/core.go +++ b/vault/core.go @@ -49,6 +49,7 @@ import ( "github.com/hashicorp/vault/helper/metricsutil" "github.com/hashicorp/vault/helper/namespace" "github.com/hashicorp/vault/helper/osutil" + "github.com/hashicorp/vault/limits" "github.com/hashicorp/vault/physical/raft" "github.com/hashicorp/vault/sdk/helper/certutil" "github.com/hashicorp/vault/sdk/helper/consts" @@ -707,6 +708,9 @@ type Core struct { periodicLeaderRefreshInterval time.Duration clusterAddrBridge *raft.ClusterAddrBridge + + limiterRegistry *limits.LimiterRegistry + limiterRegistryLock sync.Mutex } func (c *Core) ActiveNodeClockSkewMillis() int64 { @@ -717,6 +721,10 @@ func (c *Core) EchoDuration() time.Duration { return c.echoDuration.Load() } +func (c *Core) GetRequestLimiter(key string) *limits.RequestLimiter { + return c.limiterRegistry.GetLimiter(key) +} + // c.stateLock needs to be held in read mode before calling this function. func (c *Core) HAState() consts.HAState { switch { @@ -882,6 +890,8 @@ type CoreConfig struct { PeriodicLeaderRefreshInterval time.Duration ClusterAddrBridge *raft.ClusterAddrBridge + + LimiterRegistry *limits.LimiterRegistry } // GetServiceRegistration returns the config's ServiceRegistration, or nil if it does @@ -984,6 +994,10 @@ func CreateCore(conf *CoreConfig) (*Core, error) { } } + if conf.LimiterRegistry == nil { + conf.LimiterRegistry = limits.NewLimiterRegistry(conf.Logger.Named("limits")) + } + // Use imported logging deadlock if requested var stateLock locking.RWMutex stateLock = &locking.SyncRWMutex{} @@ -1284,6 +1298,11 @@ func NewCore(conf *CoreConfig) (*Core, error) { return nil, err } + c.limiterRegistry = conf.LimiterRegistry + c.limiterRegistryLock.Lock() + c.limiterRegistry.Enable() + c.limiterRegistryLock.Unlock() + // Version history if c.versionHistory == nil { c.logger.Info("Initializing version history cache for core") diff --git a/vault/core_metrics.go b/vault/core_metrics.go index 7ceea13c0d59..c7be49c7364a 100644 --- a/vault/core_metrics.go +++ b/vault/core_metrics.go @@ -13,6 +13,7 @@ import ( "github.com/armon/go-metrics" "github.com/hashicorp/vault/helper/metricsutil" "github.com/hashicorp/vault/helper/namespace" + "github.com/hashicorp/vault/limits" "github.com/hashicorp/vault/physical/raft" "github.com/hashicorp/vault/sdk/helper/consts" "github.com/hashicorp/vault/sdk/logical" @@ -79,6 +80,20 @@ func (c *Core) metricsLoop(stopCh chan struct{}) { c.metricSink.SetGaugeWithLabels([]string{"core", "replication", "write_undo_logs"}, 0, nil) } + writeLimiter := c.GetRequestLimiter(limits.WriteLimiter) + if writeLimiter != nil { + c.metricSink.SetGaugeWithLabels([]string{ + "core", "limits", "concurrency", limits.WriteLimiter, + }, float32(writeLimiter.EstimatedLimit()), nil) + } + + pathLimiter := c.GetRequestLimiter(limits.SpecialPathLimiter) + if pathLimiter != nil { + c.metricSink.SetGaugeWithLabels([]string{ + "core", "limits", "concurrency", limits.SpecialPathLimiter, + }, float32(pathLimiter.EstimatedLimit()), nil) + } + // Refresh the standby gauge, on all nodes if haState != consts.Active { c.metricSink.SetGaugeWithLabels([]string{"core", "active"}, 0, nil) diff --git a/vault/router.go b/vault/router.go index 851890075be9..32c9ebc28a10 100644 --- a/vault/router.go +++ b/vault/router.go @@ -68,6 +68,7 @@ type routeEntry struct { rootPaths atomic.Value loginPaths atomic.Value binaryPaths atomic.Value + limitedPaths atomic.Value l sync.RWMutex } @@ -78,12 +79,16 @@ type wildcardPath struct { isPrefix bool } -// loginPathsEntry is used to hold the routeEntry loginPaths -type loginPathsEntry struct { +// specialPathsEntry is used to hold the routeEntry specialPaths +type specialPathsEntry struct { paths *radix.Tree wildcardPaths []wildcardPath } +// specialPathsLookupFunc is used by (*Router).specialPath to look up a +// specialPathsEntry corresponding to loginPath, binaryPath, or limitedPath. +type specialPathsLookupFunc func(re *routeEntry) *specialPathsEntry + type ValidateMountResponse struct { MountType string `json:"mount_type" structs:"mount_type" mapstructure:"mount_type"` MountAccessor string `json:"mount_accessor" structs:"mount_accessor" mapstructure:"mount_accessor"` @@ -204,12 +209,19 @@ func (r *Router) Mount(backend logical.Backend, prefix string, mountEntry *Mount return err } re.loginPaths.Store(loginPathsEntry) + binaryPathsEntry, err := parseUnauthenticatedPaths(paths.Binary) if err != nil { return err } re.binaryPaths.Store(binaryPathsEntry) + limitedPathsEntry, err := parseUnauthenticatedPaths(paths.Limited) + if err != nil { + return err + } + re.limitedPaths.Store(limitedPathsEntry) + switch { case prefix == "": return fmt.Errorf("missing prefix to be used for router entry; mount_path: %q, mount_type: %q", re.mountEntry.Path, re.mountEntry.Type) @@ -886,11 +898,37 @@ func (r *Router) RootPath(ctx context.Context, path string) bool { } // LoginPath checks if the given path is used for logins +func (r *Router) LoginPath(ctx context.Context, path string) bool { + return r.specialPath(ctx, path, + func(re *routeEntry) *specialPathsEntry { + return re.loginPaths.Load().(*specialPathsEntry) + }) +} + +// BinaryPath checks if the given path is used for binary requests +func (r *Router) BinaryPath(ctx context.Context, path string) bool { + return r.specialPath(ctx, path, + func(re *routeEntry) *specialPathsEntry { + return re.binaryPaths.Load().(*specialPathsEntry) + }) +} + +// LimitedPath checks if the given path uses limited requests +func (r *Router) LimitedPath(ctx context.Context, path string) bool { + return r.specialPath(ctx, path, + func(re *routeEntry) *specialPathsEntry { + return re.limitedPaths.Load().(*specialPathsEntry) + }) +} + +// specialPath is a common method for checking if the given path has a matching +// PathsSpecial entry. This is used for Login, Binary, and Limited PathsSpecial +// fields. // Matching Priority // 1. prefix // 2. exact // 3. wildcard -func (r *Router) LoginPath(ctx context.Context, path string) bool { +func (r *Router) specialPath(ctx context.Context, path string, lookup specialPathsLookupFunc) bool { ns, err := namespace.FromContext(ctx) if err != nil { return false @@ -909,8 +947,8 @@ func (r *Router) LoginPath(ctx context.Context, path string) bool { // Trim to get remaining path remain := strings.TrimPrefix(adjustedPath, mount) - // Check the loginPaths of this backend - pe := re.loginPaths.Load().(*loginPathsEntry) + // Check the specialPath of this backend as specified by the caller. + pe := lookup(re) match, raw, ok := pe.paths.LongestPrefix(remain) if !ok && len(pe.wildcardPaths) == 0 { // no match found @@ -939,57 +977,6 @@ func (r *Router) LoginPath(ctx context.Context, path string) bool { return false } -// BinaryPath checks if the given path uses binary requests -func (r *Router) BinaryPath(ctx context.Context, path string) bool { - ns, err := namespace.FromContext(ctx) - if err != nil { - return false - } - - adjustedPath := ns.Path + path - - r.l.RLock() - mount, raw, ok := r.root.LongestPrefix(adjustedPath) - r.l.RUnlock() - if !ok { - return false - } - re := raw.(*routeEntry) - - // Trim to get remaining path - remain := strings.TrimPrefix(adjustedPath, mount) - - // Check the binaryPaths of this backend - // Check the loginPaths of this backend - pe := re.binaryPaths.Load().(*loginPathsEntry) - match, raw, ok := pe.paths.LongestPrefix(remain) - if !ok && len(pe.wildcardPaths) == 0 { - // no match found - return false - } - - if ok { - prefixMatch := raw.(bool) - // Handle the prefix match case - if prefixMatch && strings.HasPrefix(remain, match) { - return true - } - if match == remain { - // Handle the exact match case - return true - } - } - - // check Login Paths containing wildcards - reqPathParts := strings.Split(remain, "/") - for _, w := range pe.wildcardPaths { - if pathMatchesWildcardPath(reqPathParts, w.segments, w.isPrefix) { - return true - } - } - return false -} - // pathMatchesWildcardPath returns true if the path made up of the path slice // matches the given wildcard path slice func pathMatchesWildcardPath(path, wcPath []string, isPrefix bool) bool { @@ -1038,8 +1025,8 @@ func isValidUnauthenticatedPath(path string) (bool, error) { } // parseUnauthenticatedPaths converts a list of special paths to a -// loginPathsEntry -func parseUnauthenticatedPaths(paths []string) (*loginPathsEntry, error) { +// specialPathsEntry +func parseUnauthenticatedPaths(paths []string) (*specialPathsEntry, error) { var tempPaths []string tempWildcardPaths := make([]wildcardPath, 0) for _, path := range paths { @@ -1065,7 +1052,7 @@ func parseUnauthenticatedPaths(paths []string) (*loginPathsEntry, error) { } } - return &loginPathsEntry{ + return &specialPathsEntry{ paths: pathsToRadix(tempPaths), wildcardPaths: tempWildcardPaths, }, nil diff --git a/vault/router_access.go b/vault/router_access.go index 5972c3aa0523..8fc150fd1469 100644 --- a/vault/router_access.go +++ b/vault/router_access.go @@ -23,3 +23,7 @@ func (r *RouterAccess) StoragePrefixByAPIPath(ctx context.Context, path string) func (r *RouterAccess) IsBinaryPath(ctx context.Context, path string) bool { return r.c.router.BinaryPath(ctx, path) } + +func (r *RouterAccess) IsLimitedPath(ctx context.Context, path string) bool { + return r.c.router.LimitedPath(ctx, path) +} diff --git a/vault/router_test.go b/vault/router_test.go index a91c4ad002e0..d6a3c0ec66e1 100644 --- a/vault/router_test.go +++ b/vault/router_test.go @@ -581,7 +581,7 @@ func TestParseUnauthenticatedPaths(t *testing.T) { {segments: []string{"+", "begin", ""}, isPrefix: true}, {segments: []string{"middle", "+", "bar"}, isPrefix: true}, } - expected := &loginPathsEntry{ + expected := &specialPathsEntry{ paths: pathsToRadix(paths), wildcardPaths: wildcardPathsEntry, } diff --git a/vault/testing.go b/vault/testing.go index 76de21af218c..d993950daa67 100644 --- a/vault/testing.go +++ b/vault/testing.go @@ -49,6 +49,7 @@ import ( "github.com/hashicorp/vault/helper/testhelpers/corehelpers" "github.com/hashicorp/vault/helper/testhelpers/pluginhelpers" "github.com/hashicorp/vault/internalshared/configutil" + "github.com/hashicorp/vault/limits" "github.com/hashicorp/vault/sdk/framework" "github.com/hashicorp/vault/sdk/helper/consts" "github.com/hashicorp/vault/sdk/helper/logging" @@ -1130,6 +1131,8 @@ type TestClusterOptions struct { // ABCDLoggerNames names the loggers according to our ABCD convention when generating 4 clusters ABCDLoggerNames bool + + LimiterRegistry *limits.LimiterRegistry } type TestPluginConfig struct { @@ -1420,6 +1423,7 @@ func NewTestCluster(t testing.T, base *CoreConfig, opts *TestClusterOptions) *Te EnableUI: true, EnableRaw: true, BuiltinRegistry: corehelpers.NewMockBuiltinRegistry(), + LimiterRegistry: limits.NewLimiterRegistry(testCluster.Logger), } if base != nil { @@ -1507,6 +1511,11 @@ func NewTestCluster(t testing.T, base *CoreConfig, opts *TestClusterOptions) *Te coreConfig.ExpirationRevokeRetryBase = base.ExpirationRevokeRetryBase coreConfig.PeriodicLeaderRefreshInterval = base.PeriodicLeaderRefreshInterval coreConfig.ClusterAddrBridge = base.ClusterAddrBridge + + if base.LimiterRegistry != nil { + coreConfig.LimiterRegistry = base.LimiterRegistry + } + testApplyEntBaseConfig(coreConfig, base) } if coreConfig.ClusterName == "" { @@ -1900,6 +1909,10 @@ func (testCluster *TestCluster) newCore(t testing.T, idx int, coreConfig *CoreCo localConfig.NumExpirationWorkers = numExpirationWorkersTest + if opts != nil && opts.LimiterRegistry != nil { + localConfig.LimiterRegistry = opts.LimiterRegistry + } + c, err := NewCore(&localConfig) if err != nil { t.Fatalf("err: %v", err)