9b963fc777
Merge in DNS/adguard-home from 2276-fix-lint-3 to master Updates #2276. Squashed commit of the following: commit 6ee94cc6ed2a9762b70ef395b58b496434244b80 Author: Ainar Garipov <A.Garipov@AdGuard.COM> Date: Mon Dec 7 15:55:45 2020 +0300 all: fix lint and naming issues vol. 3
120 lines
2.3 KiB
Go
120 lines
2.3 KiB
Go
package home
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import (
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"bytes"
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"encoding/binary"
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"io/ioutil"
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"net"
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"net/http"
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"os"
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"time"
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"unsafe"
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"github.com/AdguardTeam/AdGuardHome/internal/aghio"
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"github.com/AdguardTeam/golibs/log"
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)
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// GLMode - enable GL-Inet compatibility mode
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var GLMode bool
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var glFilePrefix = "/tmp/gl_token_"
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const (
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glTokenTimeoutSeconds = 3600
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glCookieName = "Admin-Token"
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)
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func glProcessRedirect(w http.ResponseWriter, r *http.Request) bool {
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if !GLMode {
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return false
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}
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// redirect to gl-inet login
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host, _, _ := net.SplitHostPort(r.Host)
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url := "http://" + host
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log.Debug("Auth: redirecting to %s", url)
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http.Redirect(w, r, url, http.StatusFound)
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return true
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}
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func glProcessCookie(r *http.Request) bool {
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if !GLMode {
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return false
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}
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glCookie, glerr := r.Cookie(glCookieName)
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if glerr != nil {
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return false
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}
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log.Debug("Auth: GL cookie value: %s", glCookie.Value)
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if glCheckToken(glCookie.Value) {
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return true
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}
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log.Info("Auth: invalid GL cookie value: %s", glCookie)
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return false
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}
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func glCheckToken(sess string) bool {
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tokenName := glFilePrefix + sess
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_, err := os.Stat(tokenName)
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if err != nil {
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log.Error("os.Stat: %s", err)
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return false
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}
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tokenDate := glGetTokenDate(tokenName)
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now := uint32(time.Now().UTC().Unix())
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return now <= (tokenDate + glTokenTimeoutSeconds)
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}
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func archIsLittleEndian() bool {
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var i int32 = 0x01020304
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u := unsafe.Pointer(&i)
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pb := (*byte)(u)
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b := *pb
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return (b == 0x04)
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}
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// MaxFileSize is a maximum file length in bytes.
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const MaxFileSize = 1024 * 1024
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func glGetTokenDate(file string) uint32 {
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f, err := os.Open(file)
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if err != nil {
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log.Error("os.Open: %s", err)
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return 0
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}
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defer f.Close()
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fileReadCloser, err := aghio.LimitReadCloser(f, MaxFileSize)
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if err != nil {
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log.Error("LimitReadCloser: %s", err)
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return 0
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}
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defer fileReadCloser.Close()
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var dateToken uint32
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// This use of ReadAll is now safe, because we limited reader.
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bs, err := ioutil.ReadAll(fileReadCloser)
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if err != nil {
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log.Error("ioutil.ReadAll: %s", err)
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return 0
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}
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buf := bytes.NewBuffer(bs)
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if archIsLittleEndian() {
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err := binary.Read(buf, binary.LittleEndian, &dateToken)
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if err != nil {
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log.Error("binary.Read: %s", err)
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return 0
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}
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} else {
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err := binary.Read(buf, binary.BigEndian, &dateToken)
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if err != nil {
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log.Error("binary.Read: %s", err)
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return 0
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}
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}
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return dateToken
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}
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