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package auth
import (
"errors"
"log"
"net"
"net/http"
"time"
"penguins.lan/adapters/arp"
"penguins.lan/api/types"
"penguins.lan/database"
"penguins.lan/utils"
)
const (
sessionCookie = "penguin_session"
sessionTTL = 30 * 24 * time.Hour
)
func ClientIP(req *http.Request) string {
host, _, err := net.SplitHostPort(req.RemoteAddr)
if err != nil {
return req.RemoteAddr
}
return host
}
// clientMac resolves the visitor's MAC from the DEV_MAC override or the ARP
// cache the scheduler keeps fresh. "" means we don't know it.
func clientMac(context *types.RequestContext, req *http.Request) string {
if dev := context.Args.DevMAC; dev != "" {
if mac, err := utils.ParseMac(dev); err == nil {
return mac.Format()
}
return ""
}
ip := ClientIP(req)
mac, err := database.MacForIP(context.DBConn, ip)
if err != nil {
log.Println("mac lookup failed:", err)
}
if mac != "" {
return mac
}
return liveMac(ip)
}
// liveMac falls back to a direct ARP read for a brand-new connection the
// scheduler hasn't cached yet. Non-IPv4 peers (e.g. loopback) are skipped so we
// don't shell out for addresses that can never resolve.
func liveMac(ip string) string {
if _, err := utils.ParseINet4(ip); err != nil {
return ""
}
table, err := arp.SystemProvider{}.Fetch()
if err != nil {
log.Println("live arp lookup failed:", err)
return ""
}
mac, _ := table.Lookup(ip)
return mac
}
func setSessionCookie(resp http.ResponseWriter, id string) {
http.SetCookie(resp, &http.Cookie{
Name: sessionCookie,
Value: id,
Path: "/",
MaxAge: int(sessionTTL.Seconds()),
HttpOnly: true,
SameSite: http.SameSiteLaxMode,
})
}
func clearSessionCookie(resp http.ResponseWriter) {
http.SetCookie(resp, &http.Cookie{Name: sessionCookie, Value: "", Path: "/", MaxAge: -1, HttpOnly: true})
}
func LoginUser(context *types.RequestContext, resp http.ResponseWriter, user *database.User) error {
session, err := database.CreateSession(context.DBConn, utils.RandomId(), user.ID, sessionTTL)
if err != nil {
return err
}
setSessionCookie(resp, session.ID)
context.User = user
context.Nick = user.Username
return nil
}
func ResolveSessionContinuation(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
return func(success types.Continuation, _failure types.Continuation) types.ContinuationChain {
if cookie, err := req.Cookie(sessionCookie); err == nil && cookie.Value != "" {
if user, err := database.GetSessionUser(context.DBConn, cookie.Value); err == nil {
context.User = user
context.Nick = user.Username
_ = database.TouchUser(context.DBConn, user.ID)
return success(context, req, resp)
}
}
mac := clientMac(context, req)
context.ClientMAC = mac
if mac != "" {
if user, err := database.GetUserByMAC(context.DBConn, mac); err == nil {
if err := LoginUser(context, resp, user); err != nil {
log.Println("mac auto-login failed:", err)
} else {
_ = database.TouchUser(context.DBConn, user.ID)
}
}
}
return success(context, req, resp)
}
}
func RenameContinuation(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
return func(success types.Continuation, failure types.Continuation) types.ContinuationChain {
if context.User == nil {
return success(context, req, resp)
}
newName := utils.SanitizeName(req.FormValue("username"))
if newName == "" || newName == context.User.Username {
http.Redirect(resp, req, "/", http.StatusSeeOther)
return success(context, req, resp)
}
renameError := func(message string) types.ContinuationChain {
(*context.TemplateData)["Error"] = types.BannerMessages{Messages: []string{message}}
return failure(context, req, resp)
}
switch existing, err := database.GetUserByUsername(context.DBConn, newName); {
case err == nil && existing.ID != context.User.ID:
return renameError("that handle's taken.")
case err != nil && !errors.Is(err, database.ErrNotFound):
log.Println("rename lookup failed:", err)
return renameError("something broke, try again")
}
if err := database.RenameUser(context.DBConn, context.User.ID, newName); err != nil {
log.Println("rename failed:", err)
return renameError("couldn't rename, try again")
}
context.User.Username = newName
context.Nick = newName
http.Redirect(resp, req, "/", http.StatusSeeOther)
return success(context, req, resp)
}
}
func RequireUserContinuation(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
return func(success types.Continuation, failure types.Continuation) types.ContinuationChain {
if context.User != nil {
return success(context, req, resp)
}
return failure(context, req, resp)
}
}
func GoPortalContinuation(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
return func(success types.Continuation, _failure types.Continuation) types.ContinuationChain {
http.Redirect(resp, req, "/portal", http.StatusSeeOther)
return success(context, req, resp)
}
}
func UnauthorizedContinuation(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
return func(success types.Continuation, _failure types.Continuation) types.ContinuationChain {
resp.WriteHeader(http.StatusUnauthorized)
return success(context, req, resp)
}
}
func LogoutContinuation(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
return func(success types.Continuation, _failure types.Continuation) types.ContinuationChain {
if cookie, err := req.Cookie(sessionCookie); err == nil && cookie.Value != "" {
_ = database.DeleteSession(context.DBConn, cookie.Value)
}
clearSessionCookie(resp)
http.Redirect(resp, req, "/portal", http.StatusSeeOther)
return success(context, req, resp)
}
}
type portalView struct {
SuggestedName string
RequestedName string
DetectedMAC string
Taken bool
LastSeen string
}
func ShowPortalContinuation(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
return func(success types.Continuation, failure types.Continuation) types.ContinuationChain {
if context.User != nil {
http.Redirect(resp, req, "/", http.StatusSeeOther)
return failure(context, req, resp)
}
(*context.TemplateData)["Portal"] = portalView{
SuggestedName: utils.SuggestName(),
DetectedMAC: context.ClientMAC,
}
return success(context, req, resp)
}
}
func SetupUserContinuation(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
return func(success types.Continuation, failure types.Continuation) types.ContinuationChain {
username := utils.SanitizeName(req.FormValue("username"))
reclaim := req.FormValue("reclaim") == "1"
mac := clientMac(context, req)
context.ClientMAC = mac
view := portalView{
SuggestedName: utils.SuggestName(),
RequestedName: username,
DetectedMAC: mac,
}
fail := func(message string) types.ContinuationChain {
if message != "" {
(*context.TemplateData)["Error"] = types.BannerMessages{Messages: []string{message}}
}
(*context.TemplateData)["Portal"] = view
return failure(context, req, resp)
}
if username == "" {
resp.WriteHeader(http.StatusBadRequest)
return fail("pick a handle, any handle 🐧")
}
existing, err := database.GetUserByUsername(context.DBConn, username)
switch {
case errors.Is(err, database.ErrNotFound):
user, err := database.CreateUser(context.DBConn, utils.RandomId(), username)
if err != nil {
log.Println("create user failed:", err)
resp.WriteHeader(http.StatusInternalServerError)
return fail("couldn't create your account, try again")
}
bindAndFinish(context, resp, user, mac)
http.Redirect(resp, req, "/", http.StatusSeeOther)
return success(context, req, resp)
case err != nil:
log.Println("lookup user failed:", err)
resp.WriteHeader(http.StatusInternalServerError)
return fail("something broke, try again")
default:
if !reclaim {
view.Taken = true
view.LastSeen = utils.FormatSince(existing.LastSeen)
return fail("")
}
bindAndFinish(context, resp, existing, mac)
http.Redirect(resp, req, "/", http.StatusSeeOther)
return success(context, req, resp)
}
}
}
func bindAndFinish(context *types.RequestContext, resp http.ResponseWriter, user *database.User, mac string) {
if mac != "" {
if err := database.AssociateMAC(context.DBConn, mac, user.ID); err != nil {
log.Println("associate mac failed:", err)
}
}
_ = database.TouchUser(context.DBConn, user.ID)
if err := LoginUser(context, resp, user); err != nil {
log.Println("login failed:", err)
}
}
|
