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zeekayandHanzo Dev
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Source files keep their SPDX-License-Identifier and Hanzo copyright line; the Gitea, Gogs and LFS Test Server copyrights they used to repeat now live once in NOTICE, alongside LICENSE. The header lint accepts any copyright line above the SPDX line, so it no longer demands an upstream one. Co-authored-by: Hanzo Dev <[email protected]>
82 lines
3.4 KiB
Go
82 lines
3.4 KiB
Go
// Copyright 2026 Hanzo AI, Inc. All rights reserved.
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// SPDX-License-Identifier: MIT
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package hostmatcher
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import (
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"context"
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"crypto/tls"
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"fmt"
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"net"
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"net/http"
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"net/url"
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"syscall"
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"time"
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)
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// NewDialContext returns a DialContext for Transport, the DialContext will do allow/block list check
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func NewDialContext(usage string, allowList, blockList *HostMatchList, proxy *url.URL) func(ctx context.Context, network, addr string) (net.Conn, error) {
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// How Go HTTP Client works with redirection:
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// transport.RoundTrip URL=http://domain.com, Host=domain.com
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// transport.DialContext addrOrHost=domain.com:80
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// dialer.Control tcp4:11.22.33.44:80
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// transport.RoundTrip URL=http://www.domain.com/, Host=(empty here, in the direction, HTTP client doesn't fill the Host field)
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// transport.DialContext addrOrHost=domain.com:80
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// dialer.Control tcp4:11.22.33.44:80
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return func(ctx context.Context, network, addrOrHost string) (net.Conn, error) {
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dialer := net.Dialer{
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// default values comes from http.DefaultTransport
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Timeout: 30 * time.Second,
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KeepAlive: 30 * time.Second,
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Control: func(network, ipAddr string, c syscall.RawConn) error {
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host, port, err := net.SplitHostPort(addrOrHost)
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if err != nil {
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return err
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}
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if proxy != nil {
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// Always allow the host of the proxy, but only on the specified port.
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if host == proxy.Hostname() && port == proxy.Port() {
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return nil
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}
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}
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// in Control func, the addr was already resolved to IP:PORT format, there is no cost to do ResolveTCPAddr here
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tcpAddr, err := net.ResolveTCPAddr(network, ipAddr)
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if err != nil {
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return fmt.Errorf("%s can only call HTTP servers via TCP, deny '%s(%s:%s)', err=%w", usage, host, network, ipAddr, err)
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}
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var blockedError error
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if blockList.MatchHostOrIP(host, tcpAddr.IP) {
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blockedError = fmt.Errorf("%s can not call blocked HTTP servers (check your %s setting), deny '%s(%s)'", usage, blockList.SettingKeyHint, host, ipAddr)
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}
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// if we have an allow-list, check the allow-list first
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if !allowList.IsEmpty() {
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if !allowList.MatchHostOrIP(host, tcpAddr.IP) {
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return fmt.Errorf("%s can only call allowed HTTP servers (check your %s setting), deny '%s(%s)'", usage, allowList.SettingKeyHint, host, ipAddr)
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}
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}
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// otherwise, we always follow the blocked list
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return blockedError
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},
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}
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return dialer.DialContext(ctx, network, addrOrHost)
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}
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}
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// NewHTTPTransport builds an http.Transport that validates the request target against the allow/block
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// lists on the direct-dial path (DialContext). When an HTTP proxy is configured the proxy resolves and
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// dials the target itself, so restricting the proxied target is the proxy server's responsibility, not
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// the forge's. proxyFunc selects the proxy URL per request (the http.Transport.Proxy selector, e.g.
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// proxy.Proxy()); proxyURLFixed is the fixed proxy address the dialer must always permit; tlsConfig may
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// be nil. blockList may be nil for callers that only maintain an allow-list.
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func NewHTTPTransport(usage string, allowList, blockList *HostMatchList, proxyFunc func(*http.Request) (*url.URL, error), proxyURLFixed *url.URL, tlsConfig *tls.Config) *http.Transport {
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return &http.Transport{
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TLSClientConfig: tlsConfig,
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Proxy: proxyFunc,
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DialContext: NewDialContext(usage, allowList, blockList, proxyURLFixed),
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}
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}
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