Pull request: 3381 check private domains
Merge in DNS/adguard-home from 3381-validate-privateness to master Closes #3381. Squashed commit of the following: commit 21cb12d10b07bb0bf0578db74ca9ac7b3ac5ae14 Author: Eugene Burkov <E.Burkov@AdGuard.COM> Date: Mon Feb 14 16:29:59 2022 +0300 all: imp code, docs commit 39793551438cbea71e6ec78d0e05bee2d8dba3e5 Author: Eugene Burkov <E.Burkov@AdGuard.COM> Date: Mon Feb 14 15:08:36 2022 +0300 all: imp code, docs commit 6b71848fd0980582b1bfe24a34f48608795e9b7d Author: Eugene Burkov <E.Burkov@AdGuard.COM> Date: Mon Feb 14 14:22:00 2022 +0300 all: check private domains
This commit is contained in:
Eugene Burkov
parent
b43aa86cae
commit
f131067278
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@ -21,6 +21,11 @@ and this project adheres to
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### Changed
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- Domain-specific private reverse DNS upstream servers are now validated to
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allow only `*.in-addr.arpa` and `*.ip6.arpa` domains pointing to
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locally-served networks ([#3381]). **Note:** If you already have invalid
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entires in your configuration, consider removing them manually, since they
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essentially had no effect.
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- Response filtering is now performed using the record types of the answer
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section of messages as opposed to the type of the question ([#4238]).
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- Instead of adding the build time information, the build scripts now use the
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@ -80,6 +85,7 @@ In this release, the schema version has changed from 12 to 13.
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[#2993]: https://github.com/AdguardTeam/AdGuardHome/issues/2993
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[#3057]: https://github.com/AdguardTeam/AdGuardHome/issues/3057
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[#3367]: https://github.com/AdguardTeam/AdGuardHome/issues/3367
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[#3381]: https://github.com/AdguardTeam/AdGuardHome/issues/3381
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[#3503]: https://github.com/AdguardTeam/AdGuardHome/issues/3503
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[#4216]: https://github.com/AdguardTeam/AdGuardHome/issues/4216
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[#4221]: https://github.com/AdguardTeam/AdGuardHome/issues/4221
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2
go.mod
2
go.mod
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@ -4,7 +4,7 @@ go 1.17
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require (
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github.com/AdguardTeam/dnsproxy v0.41.1
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github.com/AdguardTeam/golibs v0.10.4
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github.com/AdguardTeam/golibs v0.10.5
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github.com/AdguardTeam/urlfilter v0.15.2
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github.com/NYTimes/gziphandler v1.1.1
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github.com/ameshkov/dnscrypt/v2 v2.2.3
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3
go.sum
3
go.sum
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@ -12,8 +12,9 @@ github.com/AdguardTeam/dnsproxy v0.41.1/go.mod h1:PZ9l22h3Er+5mxFQB7oHZMTvx+aa9R
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github.com/AdguardTeam/golibs v0.4.0/go.mod h1:skKsDKIBB7kkFflLJBpfGX+G8QFTx0WKUzB6TIgtUj4=
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github.com/AdguardTeam/golibs v0.4.2/go.mod h1:skKsDKIBB7kkFflLJBpfGX+G8QFTx0WKUzB6TIgtUj4=
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github.com/AdguardTeam/golibs v0.10.3/go.mod h1:rSfQRGHIdgfxriDDNgNJ7HmE5zRoURq8R+VdR81Zuzw=
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github.com/AdguardTeam/golibs v0.10.4 h1:TMBkablZC0IZOpRgg9fzAKlxxNhSN2YJq7qbgtuZ7PQ=
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github.com/AdguardTeam/golibs v0.10.4/go.mod h1:rSfQRGHIdgfxriDDNgNJ7HmE5zRoURq8R+VdR81Zuzw=
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github.com/AdguardTeam/golibs v0.10.5 h1:4/nl1yIBJOv5luVu9SURW8LfgOjI3zQ2moIUy/1k0y4=
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github.com/AdguardTeam/golibs v0.10.5/go.mod h1:rSfQRGHIdgfxriDDNgNJ7HmE5zRoURq8R+VdR81Zuzw=
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github.com/AdguardTeam/gomitmproxy v0.2.0/go.mod h1:Qdv0Mktnzer5zpdpi5rAwixNJzW2FN91LjKJCkVbYGU=
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github.com/AdguardTeam/urlfilter v0.15.2 h1:LZGgrm4l4Ys9eAqB+UUmZfiC6vHlDlYFhx0WXqo6LtQ=
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github.com/AdguardTeam/urlfilter v0.15.2/go.mod h1:46YZDOV1+qtdRDuhZKVPSSp7JWWes0KayqHrKAFBdEI=
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@ -6,16 +6,18 @@ import (
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// SubnetDetector describes IP address properties.
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type SubnetDetector struct {
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// spNets is the slice of special-purpose address registries as defined
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// by RFC-6890 (https://tools.ietf.org/html/rfc6890).
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// spNets is the collection of special-purpose address registries as defined
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// by RFC 6890.
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spNets []*net.IPNet
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// locServedNets is the slice of locally-served networks as defined by
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// RFC-6303 (https://tools.ietf.org/html/rfc6303).
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// locServedNets is the collection of locally-served networks as defined by
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// RFC 6303.
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locServedNets []*net.IPNet
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}
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// NewSubnetDetector returns a new IP detector.
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//
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// TODO(a.garipov): Decide whether an error is actually needed.
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func NewSubnetDetector() (snd *SubnetDetector, err error) {
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spNets := []string{
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// "This" network.
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@ -5,10 +5,12 @@ import (
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"fmt"
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"net"
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"net/http"
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"sort"
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"strings"
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"time"
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"github.com/AdguardTeam/AdGuardHome/internal/aghhttp"
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"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
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"github.com/AdguardTeam/dnsproxy/proxy"
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"github.com/AdguardTeam/dnsproxy/upstream"
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"github.com/AdguardTeam/golibs/errors"
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@ -41,7 +43,7 @@ type dnsConfig struct {
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LocalPTRUpstreams *[]string `json:"local_ptr_upstreams"`
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}
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func (s *Server) getDNSConfig() dnsConfig {
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func (s *Server) getDNSConfig() (c *dnsConfig) {
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s.serverLock.RLock()
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defer s.serverLock.RUnlock()
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@ -70,7 +72,7 @@ func (s *Server) getDNSConfig() dnsConfig {
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upstreamMode = "parallel"
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}
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return dnsConfig{
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return &dnsConfig{
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Upstreams: &upstreams,
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UpstreamsFile: &upstreamFile,
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Bootstraps: &bootstraps,
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@ -106,7 +108,7 @@ func (s *Server) handleGetConfig(w http.ResponseWriter, r *http.Request) {
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// since there is no need to omit it while decoding from JSON.
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DefautLocalPTRUpstreams []string `json:"default_local_ptr_upstreams,omitempty"`
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}{
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dnsConfig: s.getDNSConfig(),
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dnsConfig: *s.getDNSConfig(),
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DefautLocalPTRUpstreams: defLocalPTRUps,
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}
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@ -138,39 +140,63 @@ func (req *dnsConfig) checkBlockingMode() bool {
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}
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func (req *dnsConfig) checkUpstreamsMode() bool {
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if req.UpstreamMode == nil {
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return true
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valid := []string{"", "fastest_addr", "parallel"}
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return req.UpstreamMode == nil || stringutil.InSlice(valid, *req.UpstreamMode)
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}
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for _, valid := range []string{
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"",
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"fastest_addr",
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"parallel",
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} {
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if *req.UpstreamMode == valid {
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return true
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}
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}
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return false
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}
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func (req *dnsConfig) checkBootstrap() (string, error) {
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func (req *dnsConfig) checkBootstrap() (err error) {
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if req.Bootstraps == nil {
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return "", nil
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return nil
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}
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for _, boot := range *req.Bootstraps {
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if boot == "" {
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return boot, fmt.Errorf("invalid bootstrap server address: empty")
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var b string
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defer func() { err = errors.Annotate(err, "checking bootstrap %s: invalid address: %w", b) }()
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for _, b = range *req.Bootstraps {
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if b == "" {
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return errors.Error("empty")
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}
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if _, err := upstream.NewResolver(boot, nil); err != nil {
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return boot, fmt.Errorf("invalid bootstrap server address: %w", err)
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if _, err = upstream.NewResolver(b, nil); err != nil {
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return err
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}
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}
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return "", nil
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return nil
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}
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// validate returns an error if any field of req is invalid.
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func (req *dnsConfig) validate(snd *aghnet.SubnetDetector) (err error) {
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if req.Upstreams != nil {
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err = ValidateUpstreams(*req.Upstreams)
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if err != nil {
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return fmt.Errorf("validating upstream servers: %w", err)
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}
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}
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if req.LocalPTRUpstreams != nil {
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err = ValidateUpstreamsPrivate(*req.LocalPTRUpstreams, snd)
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if err != nil {
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return fmt.Errorf("validating private upstream servers: %w", err)
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}
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}
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err = req.checkBootstrap()
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if err != nil {
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return err
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}
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switch {
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case !req.checkBlockingMode():
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return errors.Error("blocking_mode: incorrect value")
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case !req.checkUpstreamsMode():
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return errors.Error("upstream_mode: incorrect value")
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case !req.checkCacheTTL():
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return errors.Error("cache_ttl_min must be less or equal than cache_ttl_max")
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default:
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return nil
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}
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}
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func (req *dnsConfig) checkCacheTTL() bool {
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@ -190,69 +216,33 @@ func (req *dnsConfig) checkCacheTTL() bool {
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}
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func (s *Server) handleSetConfig(w http.ResponseWriter, r *http.Request) {
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req := dnsConfig{}
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err := json.NewDecoder(r.Body).Decode(&req)
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req := &dnsConfig{}
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err := json.NewDecoder(r.Body).Decode(req)
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if err != nil {
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aghhttp.Error(r, w, http.StatusBadRequest, "json Encode: %s", err)
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aghhttp.Error(r, w, http.StatusBadRequest, "decoding request: %s", err)
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return
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}
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if req.Upstreams != nil {
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if err = ValidateUpstreams(*req.Upstreams); err != nil {
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aghhttp.Error(r, w, http.StatusBadRequest, "wrong upstreams specification: %s", err)
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err = req.validate(s.subnetDetector)
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if err != nil {
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aghhttp.Error(r, w, http.StatusBadRequest, "%s", err)
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return
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}
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}
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var errBoot string
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if errBoot, err = req.checkBootstrap(); err != nil {
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aghhttp.Error(
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r,
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w,
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http.StatusBadRequest,
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"%s can not be used as bootstrap dns cause: %s",
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errBoot,
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err,
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)
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return
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}
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switch {
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case !req.checkBlockingMode():
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aghhttp.Error(r, w, http.StatusBadRequest, "blocking_mode: incorrect value")
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return
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case !req.checkUpstreamsMode():
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aghhttp.Error(r, w, http.StatusBadRequest, "upstream_mode: incorrect value")
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return
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case !req.checkCacheTTL():
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aghhttp.Error(
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r,
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w,
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http.StatusBadRequest,
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"cache_ttl_min must be less or equal than cache_ttl_max",
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)
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return
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default:
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// Go on.
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}
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restart := s.setConfig(req)
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s.conf.ConfigModified()
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if restart {
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if err = s.Reconfigure(nil); err != nil {
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err = s.Reconfigure(nil)
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if err != nil {
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aghhttp.Error(r, w, http.StatusInternalServerError, "%s", err)
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}
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}
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}
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func (s *Server) setConfigRestartable(dc dnsConfig) (restart bool) {
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func (s *Server) setConfigRestartable(dc *dnsConfig) (restart bool) {
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if dc.Upstreams != nil {
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s.conf.UpstreamDNS = *dc.Upstreams
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restart = true
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@ -273,9 +263,9 @@ func (s *Server) setConfigRestartable(dc dnsConfig) (restart bool) {
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restart = true
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}
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if dc.RateLimit != nil {
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restart = restart || s.conf.Ratelimit != *dc.RateLimit
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if dc.RateLimit != nil && s.conf.Ratelimit != *dc.RateLimit {
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s.conf.Ratelimit = *dc.RateLimit
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restart = true
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}
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|
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if dc.EDNSCSEnabled != nil {
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|
|
@ -306,7 +296,7 @@ func (s *Server) setConfigRestartable(dc dnsConfig) (restart bool) {
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return restart
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}
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|
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func (s *Server) setConfig(dc dnsConfig) (restart bool) {
|
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func (s *Server) setConfig(dc *dnsConfig) (restart bool) {
|
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s.serverLock.Lock()
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defer s.serverLock.Unlock()
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|
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|
|
@ -353,52 +343,117 @@ type upstreamJSON struct {
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PrivateUpstreams []string `json:"private_upstream"`
|
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}
|
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|
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// IsCommentOrEmpty returns true of the string starts with a "#" character or is
|
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// an empty string. This function is useful for filtering out non-upstream
|
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// lines from upstream configs.
|
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// IsCommentOrEmpty returns true if s starts with a "#" character or is empty.
|
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// This function is useful for filtering out non-upstream lines from upstream
|
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// configs.
|
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func IsCommentOrEmpty(s string) (ok bool) {
|
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return len(s) == 0 || s[0] == '#'
|
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}
|
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|
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// LocalNetChecker is used to check if the IP address belongs to a local
|
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// network.
|
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type LocalNetChecker interface {
|
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// IsLocallyServedNetwork returns true if ip is contained in any of address
|
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// registries defined by RFC 6303.
|
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IsLocallyServedNetwork(ip net.IP) (ok bool)
|
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}
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|
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// type check
|
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var _ LocalNetChecker = (*aghnet.SubnetDetector)(nil)
|
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|
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// newUpstreamConfig validates upstreams and returns an appropriate upstream
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// configuration or nil if it can't be built.
|
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//
|
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// TODO(e.burkov): Perhaps proxy.ParseUpstreamsConfig should validate upstreams
|
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// slice already so that this function may be considered useless.
|
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func newUpstreamConfig(upstreams []string) (conf *proxy.UpstreamConfig, err error) {
|
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// No need to validate comments and empty lines.
|
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upstreams = stringutil.FilterOut(upstreams, IsCommentOrEmpty)
|
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if len(upstreams) == 0 {
|
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// Consider this case valid since it means the default server should be
|
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// used.
|
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return nil, nil
|
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}
|
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|
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conf, err = proxy.ParseUpstreamsConfig(
|
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upstreams,
|
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&upstream.Options{Bootstrap: []string{}, Timeout: DefaultTimeout},
|
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)
|
||||
if err != nil {
|
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return nil, err
|
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} else if len(conf.Upstreams) == 0 {
|
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return nil, errors.Error("no default upstreams specified")
|
||||
}
|
||||
|
||||
for _, u := range upstreams {
|
||||
_, err = validateUpstream(u)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
|
||||
return conf, nil
|
||||
}
|
||||
|
||||
// ValidateUpstreams validates each upstream and returns an error if any
|
||||
// upstream is invalid or if there are no default upstreams specified.
|
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//
|
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// TODO(e.burkov): Move into aghnet or even into dnsproxy.
|
||||
func ValidateUpstreams(upstreams []string) (err error) {
|
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// No need to validate comments
|
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upstreams = stringutil.FilterOut(upstreams, IsCommentOrEmpty)
|
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_, err = newUpstreamConfig(upstreams)
|
||||
|
||||
// Consider this case valid because defaultDNS will be used
|
||||
if len(upstreams) == 0 {
|
||||
return err
|
||||
}
|
||||
|
||||
// stringKeysSorted returns the sorted slice of string keys of m.
|
||||
//
|
||||
// TODO(e.burkov): Use generics in Go 1.18. Move into golibs.
|
||||
func stringKeysSorted(m map[string][]upstream.Upstream) (sorted []string) {
|
||||
sorted = make([]string, 0, len(m))
|
||||
for s := range m {
|
||||
sorted = append(sorted, s)
|
||||
}
|
||||
|
||||
sort.Strings(sorted)
|
||||
|
||||
return sorted
|
||||
}
|
||||
|
||||
// ValidateUpstreamsPrivate validates each upstream and returns an error if any
|
||||
// upstream is invalid or if there are no default upstreams specified. It also
|
||||
// checks each domain of domain-specific upstreams for being ARPA pointing to
|
||||
// a locally-served network. lnc must not be nil.
|
||||
func ValidateUpstreamsPrivate(upstreams []string, lnc LocalNetChecker) (err error) {
|
||||
conf, err := newUpstreamConfig(upstreams)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if conf == nil {
|
||||
return nil
|
||||
}
|
||||
|
||||
_, err = proxy.ParseUpstreamsConfig(
|
||||
upstreams,
|
||||
&upstream.Options{
|
||||
Bootstrap: []string{},
|
||||
Timeout: DefaultTimeout,
|
||||
},
|
||||
var errs []error
|
||||
|
||||
for _, domain := range stringKeysSorted(conf.DomainReservedUpstreams) {
|
||||
var subnet *net.IPNet
|
||||
subnet, err = netutil.SubnetFromReversedAddr(domain)
|
||||
if err != nil {
|
||||
errs = append(errs, err)
|
||||
|
||||
continue
|
||||
}
|
||||
|
||||
if !lnc.IsLocallyServedNetwork(subnet.IP) {
|
||||
errs = append(
|
||||
errs,
|
||||
fmt.Errorf("arpa domain %q should point to a locally-served network", domain),
|
||||
)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
var defaultUpstreamFound bool
|
||||
for _, u := range upstreams {
|
||||
var useDefault bool
|
||||
useDefault, err = validateUpstream(u)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if !defaultUpstreamFound {
|
||||
defaultUpstreamFound = useDefault
|
||||
}
|
||||
}
|
||||
|
||||
if !defaultUpstreamFound {
|
||||
return fmt.Errorf("no default upstreams specified")
|
||||
if len(errs) > 0 {
|
||||
return errors.List("checking domain-specific upstreams", errs...)
|
||||
}
|
||||
|
||||
return nil
|
||||
|
|
|
|||
|
|
@ -184,12 +184,11 @@ func TestDNSForwardHTTP_handleSetConfig(t *testing.T) {
|
|||
wantSet: "",
|
||||
}, {
|
||||
name: "upstream_dns_bad",
|
||||
wantSet: `wrong upstreams specification: bad ipport address "!!!": address !!!: ` +
|
||||
`missing port in address`,
|
||||
wantSet: `validating upstream servers: bad ipport address "!!!": ` +
|
||||
`address !!!: missing port in address`,
|
||||
}, {
|
||||
name: "bootstraps_bad",
|
||||
wantSet: `a can not be used as bootstrap dns cause: ` +
|
||||
`invalid bootstrap server address: ` +
|
||||
wantSet: `checking bootstrap a: invalid address: ` +
|
||||
`Resolver a is not eligible to be a bootstrap DNS server`,
|
||||
}, {
|
||||
name: "cache_bad_ttl",
|
||||
|
|
@ -200,6 +199,10 @@ func TestDNSForwardHTTP_handleSetConfig(t *testing.T) {
|
|||
}, {
|
||||
name: "local_ptr_upstreams_good",
|
||||
wantSet: "",
|
||||
}, {
|
||||
name: "local_ptr_upstreams_bad",
|
||||
wantSet: `validating private upstream servers: checking domain-specific upstreams: ` +
|
||||
`bad arpa domain name "non.arpa": not a reversed ip network`,
|
||||
}, {
|
||||
name: "local_ptr_upstreams_null",
|
||||
wantSet: "",
|
||||
|
|
@ -350,7 +353,7 @@ func TestValidateUpstream(t *testing.T) {
|
|||
}
|
||||
}
|
||||
|
||||
func TestValidateUpstreamsSet(t *testing.T) {
|
||||
func TestValidateUpstreams(t *testing.T) {
|
||||
testCases := []struct {
|
||||
name string
|
||||
wantErr string
|
||||
|
|
@ -397,3 +400,52 @@ func TestValidateUpstreamsSet(t *testing.T) {
|
|||
})
|
||||
}
|
||||
}
|
||||
|
||||
func TestValidateUpstreamsPrivate(t *testing.T) {
|
||||
snd, err := aghnet.NewSubnetDetector()
|
||||
require.NoError(t, err)
|
||||
|
||||
testCases := []struct {
|
||||
name string
|
||||
wantErr string
|
||||
u string
|
||||
}{{
|
||||
name: "success_address",
|
||||
wantErr: ``,
|
||||
u: "[/1.0.0.127.in-addr.arpa/]#",
|
||||
}, {
|
||||
name: "success_subnet",
|
||||
wantErr: ``,
|
||||
u: "[/127.in-addr.arpa/]#",
|
||||
}, {
|
||||
name: "not_arpa_subnet",
|
||||
wantErr: `checking domain-specific upstreams: ` +
|
||||
`bad arpa domain name "hello.world": not a reversed ip network`,
|
||||
u: "[/hello.world/]#",
|
||||
}, {
|
||||
name: "non-private_arpa_address",
|
||||
wantErr: `checking domain-specific upstreams: ` +
|
||||
`arpa domain "1.2.3.4.in-addr.arpa." should point to a locally-served network`,
|
||||
u: "[/1.2.3.4.in-addr.arpa/]#",
|
||||
}, {
|
||||
name: "non-private_arpa_subnet",
|
||||
wantErr: `checking domain-specific upstreams: ` +
|
||||
`arpa domain "128.in-addr.arpa." should point to a locally-served network`,
|
||||
u: "[/128.in-addr.arpa/]#",
|
||||
}, {
|
||||
name: "several_bad",
|
||||
wantErr: `checking domain-specific upstreams: 2 errors: ` +
|
||||
`"arpa domain \"1.2.3.4.in-addr.arpa.\" should point to a locally-served network", ` +
|
||||
`"bad arpa domain name \"non.arpa\": not a reversed ip network"`,
|
||||
u: "[/non.arpa/1.2.3.4.in-addr.arpa/127.in-addr.arpa/]#",
|
||||
}}
|
||||
|
||||
for _, tc := range testCases {
|
||||
set := []string{"192.168.0.1", tc.u}
|
||||
|
||||
t.Run(tc.name, func(t *testing.T) {
|
||||
err = ValidateUpstreamsPrivate(set, snd)
|
||||
testutil.AssertErrorMsg(t, tc.wantErr, err)
|
||||
})
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -520,6 +520,43 @@
|
|||
]
|
||||
}
|
||||
},
|
||||
"local_ptr_upstreams_bad": {
|
||||
"req": {
|
||||
"local_ptr_upstreams": [
|
||||
"123.123.123.123",
|
||||
"[/non.arpa/]#"
|
||||
]
|
||||
},
|
||||
"want": {
|
||||
"upstream_dns": [
|
||||
"8.8.8.8:53",
|
||||
"8.8.4.4:53"
|
||||
],
|
||||
"upstream_dns_file": "",
|
||||
"bootstrap_dns": [
|
||||
"9.9.9.10",
|
||||
"149.112.112.10",
|
||||
"2620:fe::10",
|
||||
"2620:fe::fe:10"
|
||||
],
|
||||
"protection_enabled": true,
|
||||
"ratelimit": 0,
|
||||
"blocking_mode": "",
|
||||
"blocking_ipv4": "",
|
||||
"blocking_ipv6": "",
|
||||
"edns_cs_enabled": false,
|
||||
"dnssec_enabled": false,
|
||||
"disable_ipv6": false,
|
||||
"upstream_mode": "",
|
||||
"cache_size": 0,
|
||||
"cache_ttl_min": 0,
|
||||
"cache_ttl_max": 0,
|
||||
"cache_optimistic": false,
|
||||
"resolve_clients": false,
|
||||
"use_private_ptr_resolvers": false,
|
||||
"local_ptr_upstreams": []
|
||||
}
|
||||
},
|
||||
"local_ptr_upstreams_null": {
|
||||
"req": {
|
||||
"local_ptr_upstreams": null
|
||||
|
|
|
|||
Loading…
Reference in New Issue