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Only allow webhook to send requests to allowed hosts (#17482) (#17510) 

Backport #17482

* Only allow webhook to send requests to allowed hosts (backport #17482)

* use ALLOWED_HOST_LIST=* for default to keep the legacy behavior in 1.15.x
release/v1.15
wxiaoguang 2021-11-06 17:23:43 +08:00 committed by GitHub
parent 15b44496ec
commit 20ae184967
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
9 changed files with 285 additions and 26 deletions
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4
cmd/web.go
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@ -194,6 +194,10 @@ func listen(m http.Handler, handleRedirector bool) error {
listenAddr = net.JoinHostPort(listenAddr, setting.HTTPPort)
}
log.Info("Listen: %v://%s%s", setting.Protocol, listenAddr, setting.AppSubURL)
// This can be useful for users, many users do wrong to their config and get strange behaviors behind a reverse-proxy.
// A user may fix the configuration mistake when he sees this log.
// And this is also very helpful to maintainers to provide help to users to resolve their configuration problems.
log.Info("AppURL(ROOT_URL): %s", setting.AppURL)
if setting.LFS.StartServer {
log.Info("LFS server enabled")

7
custom/conf/app.example.ini
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@ -1388,6 +1388,13 @@ PATH =
;; Deliver timeout in seconds
;DELIVER_TIMEOUT = 5
;;
;; Webhook can only call allowed hosts for security reasons. Comma separated list, eg: external, 192.168.1.0/24, *.mydomain.com
;; Built-in: loopback (for localhost), private (for LAN/intranet), external (for public hosts on internet), * (for all hosts)
;; CIDR list: 1.2.3.0/8, 2001:db8::/32
;; Wildcard hosts: *.mydomain.com, 192.168.100.*
;; Default to * for 1.15.x, external for 1.16 and later
;ALLOWED_HOST_LIST = *
;;
;; Allow insecure certification
;SKIP_TLS_VERIFY = false
;;

8
docs/content/doc/advanced/config-cheat-sheet.en-us.md
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@ -545,6 +545,14 @@ Define allowed algorithms and their minimum key length (use -1 to disable a type
- `QUEUE_LENGTH`: **1000**: Hook task queue length. Use caution when editing this value.
- `DELIVER_TIMEOUT`: **5**: Delivery timeout (sec) for shooting webhooks.
- `ALLOWED_HOST_LIST`: `*`: Default to `*` for 1.15.x, `external` for 1.16 and later. Webhook can only call allowed hosts for security reasons. Comma separated list.
- Built-in networks:
- `loopback`: 127.0.0.0/8 for IPv4 and ::1/128 for IPv6, localhost is included.
- `private`: RFC 1918 (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) and RFC 4193 (FC00::/7). Also called LAN/Intranet.
- `external`: A valid non-private unicast IP, you can access all hosts on public internet.
- `*`: All hosts are allowed.
- CIDR list: `1.2.3.0/8` for IPv4 and `2001:db8::/32` for IPv6
- Wildcard hosts: `*.mydomain.com`, `192.168.100.*`
- `SKIP_TLS_VERIFY`: **false**: Allow insecure certification.
- `PAGING_NUM`: **10**: Number of webhook history events that are shown in one page.
- `PROXY_URL`: ****: Proxy server URL, support http://, https//, socks://, blank will follow environment http_proxy/https_proxy

94
modules/hostmatcher/hostmatcher.go Normal file
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@ -0,0 +1,94 @@
// Copyright 2021 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package hostmatcher
import (
"net"
"path/filepath"
"strings"
"code.gitea.io/gitea/modules/util"
)
// HostMatchList is used to check if a host or IP is in a list.
// If you only need to do wildcard matching, consider to use modules/matchlist
type HostMatchList struct {
hosts []string
ipNets []*net.IPNet
}
// MatchBuiltinAll all hosts are matched
const MatchBuiltinAll = "*"
// MatchBuiltinExternal A valid non-private unicast IP, all hosts on public internet are matched
const MatchBuiltinExternal = "external"
// MatchBuiltinPrivate RFC 1918 (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) and RFC 4193 (FC00::/7). Also called LAN/Intranet.
const MatchBuiltinPrivate = "private"
// MatchBuiltinLoopback 127.0.0.0/8 for IPv4 and ::1/128 for IPv6, localhost is included.
const MatchBuiltinLoopback = "loopback"
// ParseHostMatchList parses the host list HostMatchList
func ParseHostMatchList(hostList string) *HostMatchList {
hl := &HostMatchList{}
for _, s := range strings.Split(hostList, ",") {
s = strings.ToLower(strings.TrimSpace(s))
if s == "" {
continue
}
_, ipNet, err := net.ParseCIDR(s)
if err == nil {
hl.ipNets = append(hl.ipNets, ipNet)
} else {
hl.hosts = append(hl.hosts, s)
}
}
return hl
}
// MatchesHostOrIP checks if the host or IP matches an allow/deny(block) list
func (hl *HostMatchList) MatchesHostOrIP(host string, ip net.IP) bool {
var matched bool
host = strings.ToLower(host)
ipStr := ip.String()
loop:
for _, hostInList := range hl.hosts {
switch hostInList {
case "":
continue
case MatchBuiltinAll:
matched = true
break loop
case MatchBuiltinExternal:
if matched = ip.IsGlobalUnicast() && !util.IsIPPrivate(ip); matched {
break loop
}
case MatchBuiltinPrivate:
if matched = util.IsIPPrivate(ip); matched {
break loop
}
case MatchBuiltinLoopback:
if matched = ip.IsLoopback(); matched {
break loop
}
default:
if matched, _ = filepath.Match(hostInList, host); matched {
break loop
}
if matched, _ = filepath.Match(hostInList, ipStr); matched {
break loop
}
}
}
if !matched {
for _, ipNet := range hl.ipNets {
if matched = ipNet.Contains(ip); matched {
break
}
}
}
return matched
}

119
modules/hostmatcher/hostmatcher_test.go Normal file
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@ -0,0 +1,119 @@
// Copyright 2021 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package hostmatcher
import (
"net"
"testing"
"github.com/stretchr/testify/assert"
)
func TestHostOrIPMatchesList(t *testing.T) {
type tc struct {
host string
ip net.IP
expected bool
}
// for IPv6: "::1" is loopback, "fd00::/8" is private
hl := ParseHostMatchList("private, External, *.myDomain.com, 169.254.1.0/24")
cases := []tc{
{"", net.IPv4zero, false},
{"", net.IPv6zero, false},
{"", net.ParseIP("127.0.0.1"), false},
{"", net.ParseIP("::1"), false},
{"", net.ParseIP("10.0.1.1"), true},
{"", net.ParseIP("192.168.1.1"), true},
{"", net.ParseIP("fd00::1"), true},
{"", net.ParseIP("8.8.8.8"), true},
{"", net.ParseIP("1001::1"), true},
{"mydomain.com", net.IPv4zero, false},
{"sub.mydomain.com", net.IPv4zero, true},
{"", net.ParseIP("169.254.1.1"), true},
{"", net.ParseIP("169.254.2.2"), false},
}
for _, c := range cases {
assert.Equalf(t, c.expected, hl.MatchesHostOrIP(c.host, c.ip), "case %s(%v)", c.host, c.ip)
}
hl = ParseHostMatchList("loopback")
cases = []tc{
{"", net.IPv4zero, false},
{"", net.ParseIP("127.0.0.1"), true},
{"", net.ParseIP("10.0.1.1"), false},
{"", net.ParseIP("192.168.1.1"), false},
{"", net.ParseIP("8.8.8.8"), false},
{"", net.ParseIP("::1"), true},
{"", net.ParseIP("fd00::1"), false},
{"", net.ParseIP("1000::1"), false},
{"mydomain.com", net.IPv4zero, false},
}
for _, c := range cases {
assert.Equalf(t, c.expected, hl.MatchesHostOrIP(c.host, c.ip), "case %s(%v)", c.host, c.ip)
}
hl = ParseHostMatchList("private")
cases = []tc{
{"", net.IPv4zero, false},
{"", net.ParseIP("127.0.0.1"), false},
{"", net.ParseIP("10.0.1.1"), true},
{"", net.ParseIP("192.168.1.1"), true},
{"", net.ParseIP("8.8.8.8"), false},
{"", net.ParseIP("::1"), false},
{"", net.ParseIP("fd00::1"), true},
{"", net.ParseIP("1000::1"), false},
{"mydomain.com", net.IPv4zero, false},
}
for _, c := range cases {
assert.Equalf(t, c.expected, hl.MatchesHostOrIP(c.host, c.ip), "case %s(%v)", c.host, c.ip)
}
hl = ParseHostMatchList("external")
cases = []tc{
{"", net.IPv4zero, false},
{"", net.ParseIP("127.0.0.1"), false},
{"", net.ParseIP("10.0.1.1"), false},
{"", net.ParseIP("192.168.1.1"), false},
{"", net.ParseIP("8.8.8.8"), true},
{"", net.ParseIP("::1"), false},
{"", net.ParseIP("fd00::1"), false},
{"", net.ParseIP("1000::1"), true},
{"mydomain.com", net.IPv4zero, false},
}
for _, c := range cases {
assert.Equalf(t, c.expected, hl.MatchesHostOrIP(c.host, c.ip), "case %s(%v)", c.host, c.ip)
}
hl = ParseHostMatchList("*")
cases = []tc{
{"", net.IPv4zero, true},
{"", net.ParseIP("127.0.0.1"), true},
{"", net.ParseIP("10.0.1.1"), true},
{"", net.ParseIP("192.168.1.1"), true},
{"", net.ParseIP("8.8.8.8"), true},
{"", net.ParseIP("::1"), true},
{"", net.ParseIP("fd00::1"), true},
{"", net.ParseIP("1000::1"), true},
{"mydomain.com", net.IPv4zero, true},
}
for _, c := range cases {
assert.Equalf(t, c.expected, hl.MatchesHostOrIP(c.host, c.ip), "case %s(%v)", c.host, c.ip)
}
}

15
modules/migrations/migrate.go
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@ -89,7 +89,7 @@ func IsMigrateURLAllowed(remoteURL string, doer *models.User) error {
return &models.ErrInvalidCloneAddr{Host: u.Host, NotResolvedIP: true}
}
for _, addr := range addrList {
if isIPPrivate(addr) || !addr.IsGlobalUnicast() {
if util.IsIPPrivate(addr) || !addr.IsGlobalUnicast() {
return &models.ErrInvalidCloneAddr{Host: u.Host, PrivateNet: addr.String(), IsPermissionDenied: true}
}
}
@ -486,16 +486,3 @@ func Init() error {
return nil
}
// isIPPrivate reports whether ip is a private address, according to
// RFC 1918 (IPv4 addresses) and RFC 4193 (IPv6 addresses).
// from https://github.com/golang/go/pull/42793
// TODO remove if https://github.com/golang/go/issues/29146 got resolved
func isIPPrivate(ip net.IP) bool {
if ip4 := ip.To4(); ip4 != nil {
return ip4[0] == 10 ||
(ip4[0] == 172 && ip4[1]&0xf0 == 16) ||
(ip4[0] == 192 && ip4[1] == 168)
}
return len(ip) == net.IPv6len && ip[0]&0xfe == 0xfc
}

3
modules/setting/webhook.go
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@ -7,6 +7,7 @@ package setting
import (
"net/url"
"code.gitea.io/gitea/modules/hostmatcher"
"code.gitea.io/gitea/modules/log"
)
@ -16,6 +17,7 @@ var (
QueueLength int
DeliverTimeout int
SkipTLSVerify bool
AllowedHostList *hostmatcher.HostMatchList
Types []string
PagingNum int
ProxyURL string
@ -36,6 +38,7 @@ func newWebhookService() {
Webhook.QueueLength = sec.Key("QUEUE_LENGTH").MustInt(1000)
Webhook.DeliverTimeout = sec.Key("DELIVER_TIMEOUT").MustInt(5)
Webhook.SkipTLSVerify = sec.Key("SKIP_TLS_VERIFY").MustBool()
Webhook.AllowedHostList = hostmatcher.ParseHostMatchList(sec.Key("ALLOWED_HOST_LIST").MustString(hostmatcher.MatchBuiltinAll))
Webhook.Types = []string{"gitea", "gogs", "slack", "discord", "dingtalk", "telegram", "msteams", "feishu", "matrix"}
Webhook.PagingNum = sec.Key("PAGING_NUM").MustInt(10)
Webhook.ProxyURL = sec.Key("PROXY_URL").MustString("")

19
modules/util/net.go Normal file
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@ -0,0 +1,19 @@
// Copyright 2021 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package util
import (
"net"
)
// IsIPPrivate for net.IP.IsPrivate. TODO: replace with `ip.IsPrivate()` if min go version is bumped to 1.17
func IsIPPrivate(ip net.IP) bool {
if ip4 := ip.To4(); ip4 != nil {
return ip4[0] == 10 ||
(ip4[0] == 172 && ip4[1]&0xf0 == 16) ||
(ip4[0] == 192 && ip4[1] == 168)
}
return len(ip) == net.IPv6len && ip[0]&0xfe == 0xfc
}

26
services/webhook/deliver.go
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@ -20,6 +20,7 @@ import (
"strconv"
"strings"
"sync"
"syscall"
"time"
"code.gitea.io/gitea/models"
@ -29,6 +30,8 @@ import (
"github.com/gobwas/glob"
)
var contextKeyWebhookRequest interface{} = "contextKeyWebhookRequest"
// Deliver deliver hook task
func Deliver(t *models.HookTask) error {
w, err := models.GetWebhookByID(t.HookID)
@ -166,7 +169,7 @@ func Deliver(t *models.HookTask) error {
return fmt.Errorf("Webhook task skipped (webhooks disabled): [%d]", t.ID)
}
resp, err := webhookHTTPClient.Do(req)
resp, err := webhookHTTPClient.Do(req.WithContext(context.WithValue(req.Context(), contextKeyWebhookRequest, req)))
if err != nil {
t.ResponseInfo.Body = fmt.Sprintf("Delivery: %v", err)
return err
@ -288,14 +291,29 @@ func InitDeliverHooks() {
timeout := time.Duration(setting.Webhook.DeliverTimeout) * time.Second
webhookHTTPClient = &http.Client{
Timeout: timeout,
Transport: &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: setting.Webhook.SkipTLSVerify},
Proxy: webhookProxy(),
Dial: func(netw, addr string) (net.Conn, error) {
return net.DialTimeout(netw, addr, timeout) // dial timeout
DialContext: func(ctx context.Context, network, addrOrHost string) (net.Conn, error) {
dialer := net.Dialer{
Timeout: timeout,
Control: func(network, ipAddr string, c syscall.RawConn) error {
// in Control func, the addr was already resolved to IP:PORT format, there is no cost to do ResolveTCPAddr here
tcpAddr, err := net.ResolveTCPAddr(network, ipAddr)
req := ctx.Value(contextKeyWebhookRequest).(*http.Request)
if err != nil {
return fmt.Errorf("webhook can only call HTTP servers via TCP, deny '%s(%s:%s)', err=%v", req.Host, network, ipAddr, err)
}
if !setting.Webhook.AllowedHostList.MatchesHostOrIP(req.Host, tcpAddr.IP) {
return fmt.Errorf("webhook can only call allowed HTTP servers (check your webhook.ALLOWED_HOST_LIST setting), deny '%s(%s)'", req.Host, ipAddr)
}
return nil
},
}
return dialer.DialContext(ctx, network, addrOrHost)
},
},
Timeout: timeout, // request timeout
}
go graceful.GetManager().RunWithShutdownContext(DeliverHooks)