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Code Issues Releases Activity

added throttling on too many failed search attempts

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This commit is contained in:
Gani Georgiev 2024-11-11 14:24:38 +02:00
parent a89960db71
commit c38e7c36a6
1 changed files with 37 additions and 0 deletions
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37
apis/record_crud.go
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@ -1,10 +1,13 @@
package apis
import (
cryptoRand "crypto/rand"
"errors"
"fmt"
"math/big"
"net/http"
"strings"
"time"
"github.com/pocketbase/dbx"
"github.com/pocketbase/pocketbase/core"
@ -86,10 +89,44 @@ func recordsList(e *core.RequestEvent) error {
return firstApiError(err, e.InternalServerError("Failed to enrich records", err))
}
// Add a randomized throttle in case of too many empty search filter attempts.
//
// This is just for extra precaution since security researches raised concern regarding the possibity of eventual
// timing attacks because the List API rule acts also as filter and executes in a single run with the client-side filters.
// This is by design and it is an accepted tradeoff between performance, usability and correctness.
//
// While technically the below doesn't fully guarantee protection against filter timing attacks, in practice combined with the network latency it makes them even less feasible.
// A properly configured rate limiter or individual fields Hidden checks are better suited if you are really concerned about eventual information disclosure by side-channel attacks.
//
// In all cases it doesn't really matter that much because it doesn't affect the builtin PocketBase security sensitive fields (e.g. password and tokenKey) since they
// are not client-side filterable and in the few places where they need to be compared against an external value, a constant time check is used.
if !e.HasSuperuserAuth() &&
(collection.ListRule != nil && *collection.ListRule != "") &&
(requestInfo.Query["filter"] != "") &&
len(e.Records) == 0 &&
checkRateLimit(e.RequestEvent, "@pb_list_timing_check_"+collection.Id, listTimingRateLimitRule) != nil {
e.App.Logger().Debug("Randomized throttle because of too many failed searches", "collectionId", collection.Id)
randomizedThrottle(100)
}
return e.JSON(http.StatusOK, e.Result)
})
}
var listTimingRateLimitRule = core.RateLimitRule{MaxRequests: 3, Duration: 3}
func randomizedThrottle(softMax int64) {
var timeout int64
randRange, err := cryptoRand.Int(cryptoRand.Reader, big.NewInt(softMax))
if err == nil {
timeout = randRange.Int64()
} else {
timeout = softMax
}
time.Sleep(time.Duration(timeout) * time.Millisecond)
}
func recordView(e *core.RequestEvent) error {
collection, err := e.App.FindCachedCollectionByNameOrId(e.Request.PathValue("collection"))
if err != nil || collection == nil {