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client.go
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client.go
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// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package httpservice
import (
"context"
"crypto/tls"
"errors"
"net"
"net/http"
"time"
"github.com/mattermost/mattermost-server/model"
)
const (
ConnectTimeout = 3 * time.Second
RequestTimeout = 30 * time.Second
)
var reservedIPRanges []*net.IPNet
// IsReservedIP checks whether the target IP belongs to reserved IP address ranges to avoid SSRF attacks to the internal
// network of the Mattermost server
func IsReservedIP(ip net.IP) bool {
for _, ipRange := range reservedIPRanges {
if ipRange.Contains(ip) {
return true
}
}
return false
}
// IsOwnIP handles the special case that a request might be made to the public IP of the host which on Linux is routed
// directly via the loopback IP to any listening sockets, effectively bypassing host-based firewalls such as firewalld
func IsOwnIP(ip net.IP) (bool, error) {
interfaces, err := net.Interfaces()
if err != nil {
return false, err
}
for _, interf := range interfaces {
addresses, err := interf.Addrs()
if err != nil {
return false, err
}
for _, addr := range addresses {
var selfIP net.IP
switch v := addr.(type) {
case *net.IPNet:
selfIP = v.IP
case *net.IPAddr:
selfIP = v.IP
}
if ip.Equal(selfIP) {
return true, nil
}
}
}
return false, nil
}
var defaultUserAgent string
func init() {
for _, cidr := range []string{
// See https://tools.ietf.org/html/rfc6890
"0.0.0.0/8", // This host on this network
"10.0.0.0/8", // Private-Use
"127.0.0.0/8", // Loopback
"169.254.0.0/16", // Link Local
"172.16.0.0/12", // Private-Use Networks
"192.168.0.0/16", // Private-Use Networks
"::/128", // Unspecified Address
"::1/128", // Loopback Address
"fc00::/7", // Unique-Local
"fe80::/10", // Linked-Scoped Unicast
} {
_, parsed, err := net.ParseCIDR(cidr)
if err != nil {
panic(err)
}
reservedIPRanges = append(reservedIPRanges, parsed)
}
defaultUserAgent = "mattermost-" + model.CurrentVersion
}
type DialContextFunction func(ctx context.Context, network, addr string) (net.Conn, error)
var AddressForbidden error = errors.New("address forbidden, you may need to set AllowedUntrustedInternalConnections to allow an integration access to your internal network")
func dialContextFilter(dial DialContextFunction, allowHost func(host string) bool, allowIP func(ip net.IP) bool) DialContextFunction {
return func(ctx context.Context, network, addr string) (net.Conn, error) {
host, port, err := net.SplitHostPort(addr)
if err != nil {
return nil, err
}
if allowHost != nil && allowHost(host) {
return dial(ctx, network, addr)
}
ips, err := net.LookupIP(host)
if err != nil {
return nil, err
}
var firstErr error
for _, ip := range ips {
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
if allowIP == nil || !allowIP(ip) {
continue
}
conn, err := dial(ctx, network, net.JoinHostPort(ip.String(), port))
if err == nil {
return conn, nil
}
if firstErr == nil {
firstErr = err
}
}
if firstErr == nil {
return nil, AddressForbidden
}
return nil, firstErr
}
}
func NewTransport(enableInsecureConnections bool, allowHost func(host string) bool, allowIP func(ip net.IP) bool) http.RoundTripper {
dialContext := (&net.Dialer{
Timeout: ConnectTimeout,
KeepAlive: 30 * time.Second,
}).DialContext
if allowHost != nil || allowIP != nil {
dialContext = dialContextFilter(dialContext, allowHost, allowIP)
}
return &MattermostTransport{
&http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: dialContext,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: ConnectTimeout,
ExpectContinueTimeout: 1 * time.Second,
TLSClientConfig: &tls.Config{
InsecureSkipVerify: enableInsecureConnections,
},
},
}
}