cloudflared-mirror/ingress/ingress.go

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package ingress
import (
"fmt"
"net"
"net/url"
"regexp"
"strconv"
"strings"
"sync"
"github.com/pkg/errors"
"github.com/rs/zerolog"
"github.com/urfave/cli/v2"
"github.com/cloudflare/cloudflared/config"
"github.com/cloudflare/cloudflared/ipaccess"
)
var (
ErrNoIngressRules = errors.New("The config file doesn't contain any ingress rules")
errLastRuleNotCatchAll = errors.New("The last ingress rule must match all URLs (i.e. it should not have a hostname or path filter)")
errBadWildcard = errors.New("Hostname patterns can have at most one wildcard character (\"*\") and it can only be used for subdomains, e.g. \"*.example.com\"")
errHostnameContainsPort = errors.New("Hostname cannot contain a port")
ErrURLIncompatibleWithIngress = errors.New("You can't set the --url flag (or $TUNNEL_URL) when using multiple-origin ingress rules")
)
const (
ServiceBastion = "bastion"
ServiceSocksProxy = "socks-proxy"
ServiceWarpRouting = "warp-routing"
)
// FindMatchingRule returns the index of the Ingress Rule which matches the given
// hostname and path. This function assumes the last rule matches everything,
// which is the case if the rules were instantiated via the ingress#Validate method
func (ing Ingress) FindMatchingRule(hostname, path string) (*Rule, int) {
// The hostname might contain port. We only want to compare the host part with the rule
host, _, err := net.SplitHostPort(hostname)
if err == nil {
hostname = host
}
for i, rule := range ing.Rules {
if rule.Matches(hostname, path) {
return &rule, i
}
}
i := len(ing.Rules) - 1
return &ing.Rules[i], i
}
func matchHost(ruleHost, reqHost string) bool {
if ruleHost == reqHost {
return true
}
// Validate hostnames that use wildcards at the start
if strings.HasPrefix(ruleHost, "*.") {
toMatch := strings.TrimPrefix(ruleHost, "*.")
return strings.HasSuffix(reqHost, toMatch)
}
return false
}
// Ingress maps eyeball requests to origins.
type Ingress struct {
Rules []Rule
defaults OriginRequestConfig
}
// NewSingleOrigin constructs an Ingress set with only one rule, constructed from
// legacy CLI parameters like --url or --no-chunked-encoding.
func NewSingleOrigin(c *cli.Context, allowURLFromArgs bool) (Ingress, error) {
service, err := parseSingleOriginService(c, allowURLFromArgs)
if err != nil {
return Ingress{}, err
}
// Construct an Ingress with the single rule.
defaults := originRequestFromSingeRule(c)
ing := Ingress{
Rules: []Rule{
{
Service: service,
Config: setConfig(defaults, config.OriginRequestConfig{}),
},
},
defaults: defaults,
}
return ing, err
}
// WarpRoutingService starts a tcp stream between the origin and requests from
// warp clients.
type WarpRoutingService struct {
Proxy StreamBasedOriginProxy
}
func NewWarpRoutingService() *WarpRoutingService {
return &WarpRoutingService{Proxy: &rawTCPService{name: ServiceWarpRouting}}
}
// Get a single origin service from the CLI/config.
func parseSingleOriginService(c *cli.Context, allowURLFromArgs bool) (originService, error) {
if c.IsSet("hello-world") {
return new(helloWorld), nil
}
if c.IsSet(config.BastionFlag) {
return newBastionService(), nil
}
if c.IsSet("url") {
originURL, err := config.ValidateUrl(c, allowURLFromArgs)
if err != nil {
return nil, errors.Wrap(err, "Error validating origin URL")
}
if isHTTPService(originURL) {
return &httpService{
url: originURL,
}, nil
}
return newTCPOverWSService(originURL), nil
}
if c.IsSet("unix-socket") {
path, err := config.ValidateUnixSocket(c)
if err != nil {
return nil, errors.Wrap(err, "Error validating --unix-socket")
}
return &unixSocketPath{path: path}, nil
}
u, err := url.Parse("http://localhost:8080")
return &httpService{url: u}, err
}
// IsEmpty checks if there are any ingress rules.
func (ing Ingress) IsEmpty() bool {
return len(ing.Rules) == 0
}
// StartOrigins will start any origin services managed by cloudflared, e.g. proxy servers or Hello World.
func (ing Ingress) StartOrigins(
wg *sync.WaitGroup,
log *zerolog.Logger,
shutdownC <-chan struct{},
errC chan error,
) error {
for _, rule := range ing.Rules {
if err := rule.Service.start(wg, log, shutdownC, errC, rule.Config); err != nil {
return errors.Wrapf(err, "Error starting local service %s", rule.Service)
}
}
return nil
}
// CatchAll returns the catch-all rule (i.e. the last rule)
func (ing Ingress) CatchAll() *Rule {
return &ing.Rules[len(ing.Rules)-1]
}
func validate(ingress []config.UnvalidatedIngressRule, defaults OriginRequestConfig) (Ingress, error) {
rules := make([]Rule, len(ingress))
for i, r := range ingress {
cfg := setConfig(defaults, r.OriginRequest)
var service originService
if prefix := "unix:"; strings.HasPrefix(r.Service, prefix) {
// No validation necessary for unix socket filepath services
path := strings.TrimPrefix(r.Service, prefix)
service = &unixSocketPath{path: path}
} else if prefix := "http_status:"; strings.HasPrefix(r.Service, prefix) {
status, err := strconv.Atoi(strings.TrimPrefix(r.Service, prefix))
if err != nil {
return Ingress{}, errors.Wrap(err, "invalid HTTP status")
}
srv := newStatusCode(status)
service = &srv
} else if r.Service == "hello_world" || r.Service == "hello-world" || r.Service == "helloworld" {
service = new(helloWorld)
} else if r.Service == ServiceSocksProxy {
rules := make([]ipaccess.Rule, len(r.OriginRequest.IPRules))
for i, ipRule := range r.OriginRequest.IPRules {
rule, err := ipaccess.NewRuleByCIDR(ipRule.Prefix, ipRule.Ports, ipRule.Allow)
if err != nil {
return Ingress{}, fmt.Errorf("unable to create ip rule for %s: %s", r.Service, err)
}
rules[i] = rule
}
accessPolicy, err := ipaccess.NewPolicy(false, rules)
if err != nil {
return Ingress{}, fmt.Errorf("unable to create ip access policy for %s: %s", r.Service, err)
}
service = newSocksProxyOverWSService(accessPolicy)
} else if r.Service == ServiceBastion || cfg.BastionMode {
// Bastion mode will always start a Websocket proxy server, which will
// overwrite the localService.URL field when `start` is called. So,
// leave the URL field empty for now.
cfg.BastionMode = true
service = newBastionService()
} else {
// Validate URL services
u, err := url.Parse(r.Service)
if err != nil {
return Ingress{}, err
}
if u.Scheme == "" || u.Hostname() == "" {
return Ingress{}, fmt.Errorf("%s is an invalid address, please make sure it has a scheme and a hostname", r.Service)
}
if u.Path != "" {
return Ingress{}, fmt.Errorf("%s is an invalid address, ingress rules don't support proxying to a different path on the origin service. The path will be the same as the eyeball request's path", r.Service)
}
if isHTTPService(u) {
service = &httpService{url: u}
} else {
service = newTCPOverWSService(u)
}
}
if err := validateHostname(r, i, len(ingress)); err != nil {
return Ingress{}, err
}
var pathRegex *regexp.Regexp
if r.Path != "" {
var err error
pathRegex, err = regexp.Compile(r.Path)
if err != nil {
return Ingress{}, errors.Wrapf(err, "Rule #%d has an invalid regex", i+1)
}
}
rules[i] = Rule{
Hostname: r.Hostname,
Service: service,
Path: pathRegex,
Config: cfg,
}
}
return Ingress{Rules: rules, defaults: defaults}, nil
}
func validateHostname(r config.UnvalidatedIngressRule, ruleIndex, totalRules int) error {
// Ensure that the hostname doesn't contain port
_, _, err := net.SplitHostPort(r.Hostname)
if err == nil {
return errHostnameContainsPort
}
// Ensure that there are no wildcards anywhere except the first character
// of the hostname.
if strings.LastIndex(r.Hostname, "*") > 0 {
return errBadWildcard
}
// The last rule should catch all hostnames.
isCatchAllRule := (r.Hostname == "" || r.Hostname == "*") && r.Path == ""
isLastRule := ruleIndex == totalRules-1
if isLastRule && !isCatchAllRule {
return errLastRuleNotCatchAll
}
// ONLY the last rule should catch all hostnames.
if !isLastRule && isCatchAllRule {
return errRuleShouldNotBeCatchAll{index: ruleIndex, hostname: r.Hostname}
}
return nil
}
type errRuleShouldNotBeCatchAll struct {
index int
hostname string
}
func (e errRuleShouldNotBeCatchAll) Error() string {
return fmt.Sprintf("Rule #%d is matching the hostname '%s', but "+
"this will match every hostname, meaning the rules which follow it "+
"will never be triggered.", e.index+1, e.hostname)
}
// ParseIngress parses ingress rules, but does not send HTTP requests to the origins.
func ParseIngress(conf *config.Configuration) (Ingress, error) {
if len(conf.Ingress) == 0 {
return Ingress{}, ErrNoIngressRules
}
return validate(conf.Ingress, originRequestFromYAML(conf.OriginRequest))
}
func isHTTPService(url *url.URL) bool {
return url.Scheme == "http" || url.Scheme == "https" || url.Scheme == "ws" || url.Scheme == "wss"
}