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Add application-level per-realm firewall configuration (#644)
* Add application-level per-realm firewall configuration * Review comments
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| // Copyright 2020 Google LLC | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
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| package middleware | ||
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| import ( | ||
| "context" | ||
| "net" | ||
| "net/http" | ||
| "strings" | ||
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| "github.com/google/exposure-notifications-verification-server/pkg/controller" | ||
| "github.com/google/exposure-notifications-verification-server/pkg/render" | ||
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| "github.com/google/exposure-notifications-server/pkg/logging" | ||
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| "github.com/gorilla/mux" | ||
| ) | ||
|
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| // ProcessFirewall verifies the application-level firewall configuration. | ||
| // | ||
| // This must come after the realm has been loaded in the context, probably via a | ||
| // different middleware. | ||
| func ProcessFirewall(ctx context.Context, h *render.Renderer, typ string) mux.MiddlewareFunc { | ||
| logger := logging.FromContext(ctx).Named("middleware.ProcessFirewall") | ||
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| return func(next http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| ctx := r.Context() | ||
|
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| realm := controller.RealmFromContext(ctx) | ||
| if realm == nil { | ||
| controller.MissingRealm(w, r, h) | ||
| return | ||
| } | ||
|
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| var allowedCIDRs []string | ||
| switch typ { | ||
| case "adminapi": | ||
| allowedCIDRs = realm.AllowedCIDRsAdminAPI | ||
| case "apiserver": | ||
| allowedCIDRs = realm.AllowedCIDRsAPIServer | ||
| case "server": | ||
| allowedCIDRs = realm.AllowedCIDRsServer | ||
| default: | ||
| logger.Errorw("unknown firewall type", "type", typ) | ||
| } | ||
|
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| // If there's no CIDRs, all traffic is allowed. | ||
| if len(allowedCIDRs) == 0 { | ||
| next.ServeHTTP(w, r) | ||
| return | ||
| } | ||
|
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| logger.Debugw("validating ip in cidr block", "type", typ) | ||
|
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| // Get the remote address. | ||
| ipStr := r.RemoteAddr | ||
|
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| // Check if x-forwarded-for exists, the load balancer sets this, and the | ||
| // first entry is the real client IP. | ||
| xff := r.Header.Get("x-forwarded-for") | ||
| if xff != "" { | ||
| ipStr = strings.Split(xff, ",")[0] | ||
| } | ||
|
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| // Parse as an IP. | ||
| ip := net.ParseIP(ipStr) | ||
| if ip == nil { | ||
| logger.Errorw("provided ip could not be parsed") | ||
| } | ||
|
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| for _, c := range allowedCIDRs { | ||
| _, cidr, err := net.ParseCIDR(c) | ||
| if err != nil { | ||
| logger.Warnw("failed to parse cidr", "cidr", c, "error", err) | ||
| continue | ||
| } | ||
|
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| if cidr.Contains(ip) { | ||
| next.ServeHTTP(w, r) | ||
| return | ||
| } | ||
| } | ||
|
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| logger.Errorw("ip is not in an allowed cidr block") | ||
| controller.Unauthorized(w, r, h) | ||
| }) | ||
| } | ||
| } |
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