96 lines
2.9 KiB
Go
96 lines
2.9 KiB
Go
package oracle
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import (
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"fmt"
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"net"
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"net/http"
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"syscall"
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"github.com/nspcc-dev/neo-go/pkg/config"
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)
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// reservedCIDRs is a list of ip addresses for private networks.
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// https://tools.ietf.org/html/rfc6890
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var reservedCIDRs = []string{
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// IPv4
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"10.0.0.0/8",
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"100.64.0.0/10",
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"172.16.0.0/12",
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"192.0.0.0/24",
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"192.168.0.0/16",
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"198.18.0.0/15",
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// IPv6
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"fc00::/7",
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}
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var privateNets = make([]net.IPNet, 0, len(reservedCIDRs))
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func init() {
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for i := range reservedCIDRs {
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_, ipNet, err := net.ParseCIDR(reservedCIDRs[i])
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if err != nil {
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panic(err)
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}
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privateNets = append(privateNets, *ipNet)
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}
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}
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func isReserved(ip net.IP) bool {
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if !ip.IsGlobalUnicast() {
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return true
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}
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for i := range privateNets {
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if privateNets[i].Contains(ip) {
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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 getDefaultClient(cfg config.OracleConfiguration) *http.Client {
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d := &net.Dialer{}
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if !cfg.AllowPrivateHost {
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// Control is used after request URI is resolved and network connection (network
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// file descriptor) is created, but right before the moment listening/dialing
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// is started.
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// `address` represents resolved IP address in the format of ip:port. `address`
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// is presented in its final (resolved) form that was used directly for network
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// connection establishing.
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// Control is called for each item in the set of IP addresses got from request
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// URI resolving. The first network connection with address that passes Control
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// function will be used for further request processing. Network connection
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// with address that failed Control will be ignored. If all the connections
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// fail Control then the most relevant error (the one from the first address)
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// will be returned after `Client.Do`.
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d.Control = func(network, address string, c syscall.RawConn) error {
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host, _, err := net.SplitHostPort(address)
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if err != nil {
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return fmt.Errorf("%w: failed to split address %s: %s", ErrRestrictedRedirect, address, err)
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}
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ip := net.ParseIP(host)
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if ip == nil {
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return fmt.Errorf("%w: failed to parse IP address %s", ErrRestrictedRedirect, address)
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}
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if isReserved(ip) {
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return fmt.Errorf("%w: IP is not global unicast", ErrRestrictedRedirect)
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}
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return nil
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}
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}
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var client http.Client
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client.Transport = &http.Transport{
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DisableKeepAlives: true,
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// Do not set DialTLSContext, so that DialContext will be used to establish the
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// connection. After that TLS connection will be added to a persistent connection
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// by standard library code and handshaking will be performed.
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DialContext: d.DialContext,
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}
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client.Timeout = cfg.RequestTimeout
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client.CheckRedirect = func(req *http.Request, via []*http.Request) error {
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if len(via) >= maxRedirections { // from https://github.com/neo-project/neo-modules/pull/694
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return fmt.Errorf("%w: %d redirections are reached", ErrRestrictedRedirect, maxRedirections)
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}
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return nil
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}
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return &client
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}
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