gosora/router.go

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// Now home to the parts of gen_router.go which aren't expected to change from generation to generation
package main
import (
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"log"
"net/http"
"os"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
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c "git.tuxpa.in/a/gosora/common"
co "git.tuxpa.in/a/gosora/common/counters"
)
// TODO: Stop spilling these into the package scope?
func init() {
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_ = time.Now()
co.SetRouteMapEnum(routeMapEnum)
co.SetReverseRouteMapEnum(reverseRouteMapEnum)
co.SetAgentMapEnum(agentMapEnum)
co.SetReverseAgentMapEnum(reverseAgentMapEnum)
co.SetOSMapEnum(osMapEnum)
co.SetReverseOSMapEnum(reverseOSMapEnum)
g := func(n string) int {
a, ok := agentMapEnum[n]
if !ok {
panic("name not found in agentMapEnum")
}
return a
}
c.Chrome = g("chrome")
c.Firefox = g("firefox")
c.SimpleBots = []int{
g("semrush"),
g("ahrefs"),
g("python"),
//g("go"),
g("curl"),
}
}
type WriterIntercept struct {
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http.ResponseWriter
}
func NewWriterIntercept(w http.ResponseWriter) *WriterIntercept {
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return &WriterIntercept{w}
}
var wiMaxAge = "max-age=" + strconv.Itoa(int(c.Day))
func (wi *WriterIntercept) WriteHeader(code int) {
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if code == 200 {
h := wi.ResponseWriter.Header()
h.Set("Cache-Control", wiMaxAge)
h.Set("Vary", "Accept-Encoding")
}
wi.ResponseWriter.WriteHeader(code)
}
type GenRouter struct {
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UploadHandler func(http.ResponseWriter, *http.Request)
extraRoutes map[string]func(http.ResponseWriter, *http.Request, *c.User) c.RouteError
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reqLogger *log.Logger
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reqLog2 *RouterLog
suspLog *RouterLog
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sync.RWMutex
}
type RouterLogLog struct {
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File *os.File
Log *log.Logger
}
type RouterLog struct {
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FileVal atomic.Value
LogVal atomic.Value
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sync.RWMutex
}
func (r *GenRouter) DailyTick() error {
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currentTime := time.Now()
rotateLog := func(l *RouterLog, name string) error {
l.Lock()
defer l.Unlock()
f := l.FileVal.Load().(*os.File)
stat, e := f.Stat()
if e != nil {
return nil
}
if (stat.Size() < int64(c.Megabyte)) && (currentTime.Sub(c.StartTime).Hours() >= (24 * 7)) {
return nil
}
if e = f.Close(); e != nil {
return e
}
stimestr := strconv.FormatInt(currentTime.Unix(), 10)
f, e = os.OpenFile(c.Config.LogDir+name+stimestr+".log", os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0755)
if e != nil {
return e
}
lval := log.New(f, "", log.LstdFlags)
l.FileVal.Store(f)
l.LogVal.Store(lval)
return nil
}
if !c.Config.DisableSuspLog {
err := rotateLog(r.suspLog, "reqs-susp-")
if err != nil {
return err
}
}
return rotateLog(r.reqLog2, "reqs-")
}
type RouterConfig struct {
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Uploads http.Handler
DisableTick bool
}
func NewGenRouter(cfg *RouterConfig) (*GenRouter, error) {
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stimestr := strconv.FormatInt(c.StartTime.Unix(), 10)
createLog := func(name, stimestr string) (*RouterLog, error) {
f, err := os.OpenFile(c.Config.LogDir+name+"-"+stimestr+".log", os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0755)
if err != nil {
return nil, err
}
l := log.New(f, "", log.LstdFlags)
var aVal atomic.Value
var aVal2 atomic.Value
aVal.Store(f)
aVal2.Store(l)
return &RouterLog{FileVal: aVal, LogVal: aVal2}, nil
}
reqLog, err := createLog("reqs", stimestr)
if err != nil {
return nil, err
}
var suspReqLog *RouterLog
if !c.Config.DisableSuspLog {
suspReqLog, err = createLog("reqs-susp", stimestr)
if err != nil {
return nil, err
}
}
f3, err := os.OpenFile(c.Config.LogDir+"reqs-misc-"+stimestr+".log", os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0755)
if err != nil {
return nil, err
}
reqMiscLog := log.New(f3, "", log.LstdFlags)
ro := &GenRouter{
UploadHandler: func(w http.ResponseWriter, r *http.Request) {
writ := NewWriterIntercept(w)
http.StripPrefix("/uploads/", cfg.Uploads).ServeHTTP(writ, r)
},
extraRoutes: make(map[string]func(http.ResponseWriter, *http.Request, *c.User) c.RouteError),
reqLogger: reqMiscLog,
reqLog2: reqLog,
suspLog: suspReqLog,
}
if !cfg.DisableTick {
c.Tasks.Day.Add(ro.DailyTick)
}
return ro, nil
}
func (r *GenRouter) handleError(err c.RouteError, w http.ResponseWriter, req *http.Request, u *c.User) {
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if err.Handled() {
return
}
if err.Type() == "system" {
c.InternalErrorJSQ(err, w, req, err.JSON())
return
}
c.LocalErrorJSQ(err.Error(), w, req, u, err.JSON())
}
func (r *GenRouter) Handle(_ string, _ http.Handler) {
}
func (r *GenRouter) HandleFunc(pattern string, h func(http.ResponseWriter, *http.Request, *c.User) c.RouteError) {
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r.Lock()
defer r.Unlock()
r.extraRoutes[pattern] = h
}
func (r *GenRouter) RemoveFunc(pattern string) error {
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r.Lock()
defer r.Unlock()
_, ok := r.extraRoutes[pattern]
if !ok {
return ErrNoRoute
}
delete(r.extraRoutes, pattern)
return nil
}
func (r *GenRouter) dumpRequest(req *http.Request, pre string, log *RouterLog) {
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var sb strings.Builder
r.ddumpRequest(req, pre, log, &sb)
}
// TODO: Some of these sanitisations may be redundant
var dumpReqLen = len("\nUA: \n Host: \nIP: \n") + 7
var dumpReqLen2 = len("\nHead : ") + 2
func (r *GenRouter) ddumpRequest(req *http.Request, pre string, l *RouterLog, sb *strings.Builder) {
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nfield := func(label, val string) {
sb.WriteString(label)
sb.WriteString(val)
}
field := func(label, val string) {
nfield(label, c.SanitiseSingleLine(val))
}
ua := req.UserAgent()
sb.Grow(dumpReqLen + len(pre) + len(ua) + len(req.Method) + len(req.Host) + (dumpReqLen2 * len(req.Header)))
sb.WriteString(pre)
sb.WriteString("\n")
sb.WriteString(c.SanitiseSingleLine(req.Method))
sb.WriteRune(' ')
sb.WriteString(c.SanitiseSingleLine(req.URL.Path))
field("\nUA: ", ua)
for key, val := range req.Header {
// Avoid logging this for security reasons
if key == "Cookie" {
continue
}
for _, vvalue := range val {
sb.WriteString("\nHead ")
sb.WriteString(c.SanitiseSingleLine(key))
sb.WriteString(": ")
sb.WriteString(c.SanitiseSingleLine(vvalue))
}
}
field("\nHost: ", req.Host)
if rawQuery := req.URL.RawQuery; rawQuery != "" {
field("\nURL.RawQuery: ", rawQuery)
}
if ref := req.Referer(); ref != "" {
field("\nRef: ", ref)
}
nfield("\nIP: ", req.RemoteAddr)
sb.WriteString("\n")
str := sb.String()
l.RLock()
l.LogVal.Load().(*log.Logger).Print(str)
l.RUnlock()
}
func (r *GenRouter) DumpRequest(req *http.Request, pre string) {
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r.dumpRequest(req, pre, r.reqLog2)
}
func (r *GenRouter) unknownUA(req *http.Request) {
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if c.Dev.DebugMode {
var presb strings.Builder
presb.WriteString("Unknown UA: ")
for _, ch := range req.UserAgent() {
presb.WriteString(strconv.Itoa(int(ch)))
presb.WriteRune(' ')
}
r.ddumpRequest(req, "", r.reqLog2, &presb)
} else {
r.reqLogger.Print("unknown ua: ", c.SanitiseSingleLine(req.UserAgent()))
}
}
func (r *GenRouter) susp1(req *http.Request) bool {
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if !strings.Contains(req.URL.Path, ".") {
return false
}
if strings.Contains(req.URL.Path, "..") /* || strings.Contains(req.URL.Path,"--")*/ {
return true
}
lp := strings.ToLower(req.URL.Path)
// TODO: Flag any requests which has a dot with anything but a number after that
// TODO: Use HasSuffix to avoid over-scanning?
return strings.Contains(lp, ".php") || strings.Contains(lp, ".asp") || strings.Contains(lp, ".cgi") || strings.Contains(lp, ".py") || strings.Contains(lp, ".sql") || strings.Contains(lp, ".act") //.action
}
func (r *GenRouter) suspScan(req *http.Request) {
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if c.Config.DisableSuspLog {
if c.Dev.FullReqLog {
r.DumpRequest(req, "")
}
return
}
// TODO: Cover more suspicious strings and at a lower layer than this
var ch rune
var susp bool
for _, ch = range req.URL.Path { //char
if ch != '&' && !(ch > 44 && ch < 58) && ch != '=' && ch != '?' && !(ch > 64 && ch < 91) && ch != '\\' && ch != '_' && !(ch > 96 && ch < 123) {
susp = true
break
}
}
// Avoid logging the same request multiple times
susp2 := r.susp1(req)
if susp && susp2 {
r.SuspiciousRequest(req, "Bad char '"+string(ch)+"' in path\nBad snippet in path")
} else if susp {
r.SuspiciousRequest(req, "Bad char '"+string(ch)+"' in path")
} else if susp2 {
r.SuspiciousRequest(req, "Bad snippet in path")
} else if c.Dev.FullReqLog {
r.DumpRequest(req, "")
}
}
func isLocalHost(h string) bool {
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return h == "localhost" || h == "127.0.0.1" || h == "::1"
}
//var brPool = sync.Pool{}
var gzipPool = sync.Pool{}
//var uaBufPool = sync.Pool{}
func (r *GenRouter) responseWriter(w http.ResponseWriter) http.ResponseWriter {
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/*if bzw, ok := w.(c.BrResponseWriter); ok {
w = bzw.ResponseWriter
w.Header().Del("Content-Encoding")
} else */if gzw, ok := w.(c.GzipResponseWriter); ok {
w = gzw.ResponseWriter
w.Header().Del("Content-Encoding")
}
return w
}