Add CSRF protection

migrations/csrfToken/main.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"log"
+	"math/rand"
+	"os"
+	"path/filepath"
+	"time"
+
+	"bloat/config"
+	"bloat/kv"
+	"bloat/repository"
+	"bloat/util"
+)
+
+var (
+	configFile = "bloat.conf"
+)
+
+func init() {
+	rand.Seed(time.Now().Unix())
+}
+
+func getKeys(sessionRepoPath string) (keys []string, err error) {
+	f, err := os.Open(sessionRepoPath)
+	if err != nil {
+		return
+	}
+	return f.Readdirnames(0)
+}
+
+func main() {
+	opts, _, err := util.Getopts(os.Args, "f:")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	for _, opt := range opts {
+		switch opt.Option {
+		case 'f':
+			configFile = opt.Value
+		}
+	}
+
+	config, err := config.ParseFile(configFile)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	if !config.IsValid() {
+		log.Fatal("invalid config")
+	}
+
+	sessionRepoPath := filepath.Join(config.DatabasePath, "session")
+	sessionDB, err := kv.NewDatabse(sessionRepoPath)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	sessionRepo := repository.NewSessionRepository(sessionDB)
+
+	sessionIds, err := getKeys(sessionRepoPath)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	for _, id := range sessionIds {
+		s, err := sessionRepo.Get(id)
+		if err != nil {
+			log.Fatal(err)
+		}
+		s.CSRFToken = util.NewCSRFToken()
+		err = sessionRepo.Add(s)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+
+}

model/session.go

@@ -12,6 +12,7 @@ type Session struct {
 	ID             string   `json:"id"`
 	InstanceDomain string   `json:"instance_domain"`
 	AccessToken    string   `json:"access_token"`
+	CSRFToken      string   `json:"csrf_token"`
 	Settings       Settings `json:"settings"`
 }
 

renderer/model.go

@@ -10,12 +10,14 @@ type Context struct {
 	FluorideMode   bool
 	ThreadInNewTab bool
 	DarkMode       bool
+	CSRFToken      string
 }
 
 type HeaderData struct {
 	Title             string
 	NotificationCount int
 	CustomCSS         string
+	CSRFToken         string
 }
 
 type NavbarData struct {

service/auth.go

@@ -12,6 +12,7 @@ import (
 
 var (
 	ErrInvalidSession   = errors.New("invalid session")
+	ErrInvalidCSRFToken = errors.New("invalid csrf token")
 )
 
 type authService struct {
@@ -47,6 +48,14 @@ func (s *authService) getClient(ctx context.Context) (c *model.Client, err error
 	return c, nil
 }
 
+func checkCSRF(ctx context.Context, c *model.Client) (err error) {
+	csrfToken, ok := ctx.Value("csrf_token").(string)
+	if !ok || csrfToken != c.Session.CSRFToken {
+		return ErrInvalidCSRFToken
+	}
+	return nil
+}
+
 func (s *authService) GetAuthUrl(ctx context.Context, instance string) (
 	redirectUrl string, sessionID string, err error) {
 	return s.Service.GetAuthUrl(ctx, instance)
@@ -184,6 +193,10 @@ func (s *authService) SaveSettings(ctx context.Context, client io.Writer, c *mod
 	if err != nil {
 		return
 	}
+	err = checkCSRF(ctx, c)
+	if err != nil {
+		return
+	}
 	return s.Service.SaveSettings(ctx, client, c, settings)
 }
 
@@ -192,6 +205,10 @@ func (s *authService) Like(ctx context.Context, client io.Writer, c *model.Clien
 	if err != nil {
 		return
 	}
+	err = checkCSRF(ctx, c)
+	if err != nil {
+		return
+	}
 	return s.Service.Like(ctx, client, c, id)
 }
 
@@ -200,6 +217,10 @@ func (s *authService) UnLike(ctx context.Context, client io.Writer, c *model.Cli
 	if err != nil {
 		return
 	}
+	err = checkCSRF(ctx, c)
+	if err != nil {
+		return
+	}
 	return s.Service.UnLike(ctx, client, c, id)
 }
 
@@ -208,6 +229,10 @@ func (s *authService) Retweet(ctx context.Context, client io.Writer, c *model.Cl
 	if err != nil {
 		return
 	}
+	err = checkCSRF(ctx, c)
+	if err != nil {
+		return
+	}
 	return s.Service.Retweet(ctx, client, c, id)
 }
 
@@ -216,6 +241,10 @@ func (s *authService) UnRetweet(ctx context.Context, client io.Writer, c *model.
 	if err != nil {
 		return
 	}
+	err = checkCSRF(ctx, c)
+	if err != nil {
+		return
+	}
 	return s.Service.UnRetweet(ctx, client, c, id)
 }
 
@@ -224,6 +253,10 @@ func (s *authService) PostTweet(ctx context.Context, client io.Writer, c *model.
 	if err != nil {
 		return
 	}
+	err = checkCSRF(ctx, c)
+	if err != nil {
+		return
+	}
 	return s.Service.PostTweet(ctx, client, c, content, replyToID, format, visibility, isNSFW, files)
 }
 
@@ -232,6 +265,10 @@ func (s *authService) Follow(ctx context.Context, client io.Writer, c *model.Cli
 	if err != nil {
 		return
 	}
+	err = checkCSRF(ctx, c)
+	if err != nil {
+		return
+	}
 	return s.Service.Follow(ctx, client, c, id)
 }
 
@@ -240,5 +277,9 @@ func (s *authService) UnFollow(ctx context.Context, client io.Writer, c *model.C
 	if err != nil {
 		return
 	}
+	err = checkCSRF(ctx, c)
+	if err != nil {
+		return
+	}
 	return s.Service.UnFollow(ctx, client, c, id)
 }

service/service.go

@@ -78,12 +78,21 @@ func NewService(clientName string, clientScope string, clientWebsite string,
 	}
 }
 
-func getRendererContext(s model.Settings) *renderer.Context {
+func getRendererContext(c *model.Client) *renderer.Context {
+	var settings model.Settings
+	var session model.Session
+	if c != nil {
+		settings = c.Session.Settings
+		session = c.Session
+	} else {
+		settings = *model.NewSettings()
+	}
 	return &renderer.Context{
-		MaskNSFW:       s.MaskNSFW,
+		MaskNSFW:       settings.MaskNSFW,
-		ThreadInNewTab: s.ThreadInNewTab,
+		ThreadInNewTab: settings.ThreadInNewTab,
-		FluorideMode:   s.FluorideMode,
+		FluorideMode:   settings.FluorideMode,
-		DarkMode:       s.DarkMode,
+		DarkMode:       settings.DarkMode,
+		CSRFToken:      session.CSRFToken,
 	}
 }
 
@@ -98,9 +107,11 @@ func (svc *service) GetAuthUrl(ctx context.Context, instance string) (
 	}
 
 	sessionID = util.NewSessionId()
+	csrfToken := util.NewCSRFToken()
 	session := model.Session{
 		ID:             sessionID,
 		InstanceDomain: instance,
+		CSRFToken:      csrfToken,
 		Settings:       *model.NewSettings(),
 	}
 	err = svc.sessionRepo.Add(session)
@@ -199,13 +210,6 @@ func (svc *service) GetUserToken(ctx context.Context, sessionID string, c *model
 	if err != nil {
 		return
 	}
-	/*
-		err = c.AuthenticateToken(ctx, code, svc.clientWebsite+"/oauth_callback")
-		if err != nil {
-			return
-		}
-		err = svc.sessionRepo.Update(sessionID, c.GetAccessToken(ctx))
-	*/
 
 	return res.AccessToken, nil
 }
@@ -226,13 +230,7 @@ func (svc *service) ServeErrorPage(ctx context.Context, client io.Writer, c *mod
 		Error:      errStr,
 	}
 
-	var s model.Settings
+	rCtx := getRendererContext(c)
-	if c != nil {
-		s = c.Session.Settings
-	} else {
-		s = *model.NewSettings()
-	}
-	rCtx := getRendererContext(s)
 
 	svc.renderer.RenderErrorPage(rCtx, client, data)
 }
@@ -247,7 +245,7 @@ func (svc *service) ServeSigninPage(ctx context.Context, client io.Writer) (err
 		CommonData: commonData,
 	}
 
-	rCtx := getRendererContext(*model.NewSettings())
+	rCtx := getRendererContext(nil)
 	return svc.renderer.RenderSigninPage(rCtx, client, data)
 }
 
@@ -334,7 +332,7 @@ func (svc *service) ServeTimelinePage(ctx context.Context, client io.Writer,
 		PostContext: postContext,
 		CommonData:  commonData,
 	}
-	rCtx := getRendererContext(c.Session.Settings)
+	rCtx := getRendererContext(c)
 
 	err = svc.renderer.RenderTimelinePage(rCtx, client, data)
 	if err != nil {
@@ -416,7 +414,7 @@ func (svc *service) ServeThreadPage(ctx context.Context, client io.Writer, c *mo
 		ReplyMap:    replyMap,
 		CommonData:  commonData,
 	}
-	rCtx := getRendererContext(c.Session.Settings)
+	rCtx := getRendererContext(c)
 
 	err = svc.renderer.RenderThreadPage(rCtx, client, data)
 	if err != nil {
@@ -478,7 +476,7 @@ func (svc *service) ServeNotificationPage(ctx context.Context, client io.Writer,
 		NextLink:      nextLink,
 		CommonData:    commonData,
 	}
-	rCtx := getRendererContext(c.Session.Settings)
+	rCtx := getRendererContext(c)
 
 	err = svc.renderer.RenderNotificationPage(rCtx, client, data)
 	if err != nil {
@@ -525,7 +523,7 @@ func (svc *service) ServeUserPage(ctx context.Context, client io.Writer, c *mode
 		NextLink:   nextLink,
 		CommonData: commonData,
 	}
-	rCtx := getRendererContext(c.Session.Settings)
+	rCtx := getRendererContext(c)
 
 	err = svc.renderer.RenderUserPage(rCtx, client, data)
 	if err != nil {
@@ -544,7 +542,7 @@ func (svc *service) ServeAboutPage(ctx context.Context, client io.Writer, c *mod
 	data := &renderer.AboutData{
 		CommonData: commonData,
 	}
-	rCtx := getRendererContext(c.Session.Settings)
+	rCtx := getRendererContext(c)
 
 	err = svc.renderer.RenderAboutPage(rCtx, client, data)
 	if err != nil {
@@ -569,7 +567,7 @@ func (svc *service) ServeEmojiPage(ctx context.Context, client io.Writer, c *mod
 		Emojis:     emojis,
 		CommonData: commonData,
 	}
-	rCtx := getRendererContext(c.Session.Settings)
+	rCtx := getRendererContext(c)
 
 	err = svc.renderer.RenderEmojiPage(rCtx, client, data)
 	if err != nil {
@@ -594,7 +592,7 @@ func (svc *service) ServeLikedByPage(ctx context.Context, client io.Writer, c *m
 		CommonData: commonData,
 		Users:      likers,
 	}
-	rCtx := getRendererContext(c.Session.Settings)
+	rCtx := getRendererContext(c)
 
 	err = svc.renderer.RenderLikedByPage(rCtx, client, data)
 	if err != nil {
@@ -619,7 +617,7 @@ func (svc *service) ServeRetweetedByPage(ctx context.Context, client io.Writer,
 		CommonData: commonData,
 		Users:      retweeters,
 	}
-	rCtx := getRendererContext(c.Session.Settings)
+	rCtx := getRendererContext(c)
 
 	err = svc.renderer.RenderRetweetedByPage(rCtx, client, data)
 	if err != nil {
@@ -660,7 +658,7 @@ func (svc *service) ServeFollowingPage(ctx context.Context, client io.Writer, c
 		HasNext:    hasNext,
 		NextLink:   nextLink,
 	}
-	rCtx := getRendererContext(c.Session.Settings)
+	rCtx := getRendererContext(c)
 
 	err = svc.renderer.RenderFollowingPage(rCtx, client, data)
 	if err != nil {
@@ -701,7 +699,7 @@ func (svc *service) ServeFollowersPage(ctx context.Context, client io.Writer, c
 		HasNext:    hasNext,
 		NextLink:   nextLink,
 	}
-	rCtx := getRendererContext(c.Session.Settings)
+	rCtx := getRendererContext(c)
 
 	err = svc.renderer.RenderFollowersPage(rCtx, client, data)
 	if err != nil {
@@ -750,7 +748,7 @@ func (svc *service) ServeSearchPage(ctx context.Context, client io.Writer, c *mo
 		HasNext:    hasNext,
 		NextLink:   nextLink,
 	}
-	rCtx := getRendererContext(c.Session.Settings)
+	rCtx := getRendererContext(c)
 
 	err = svc.renderer.RenderSearchPage(rCtx, client, data)
 	if err != nil {
@@ -770,7 +768,7 @@ func (svc *service) ServeSettingsPage(ctx context.Context, client io.Writer, c *
 		CommonData: commonData,
 		Settings:   &c.Session.Settings,
 	}
-	rCtx := getRendererContext(c.Session.Settings)
+	rCtx := getRendererContext(c)
 
 	err = svc.renderer.RenderSettingsPage(rCtx, client, data)
 	if err != nil {
@@ -828,6 +826,7 @@ func (svc *service) getCommonData(ctx context.Context, client io.Writer, c *mode
 		}
 
 		data.HeaderData.NotificationCount = notificationCount
+		data.HeaderData.CSRFToken = c.Session.CSRFToken
 	}
 
 	return

service/transport.go

@@ -160,6 +160,8 @@ func NewHandler(s Service, staticDir string) http.Handler {
 
 	r.HandleFunc("/like/{id}", func(w http.ResponseWriter, req *http.Request) {
 		ctx := getContextWithSession(context.Background(), req)
+		ctx = context.WithValue(ctx, "csrf_token", req.FormValue("csrf_token"))
+
 		id, _ := mux.Vars(req)["id"]
 		retweetedByID := req.FormValue("retweeted_by_id")
 
@@ -179,6 +181,8 @@ func NewHandler(s Service, staticDir string) http.Handler {
 
 	r.HandleFunc("/unlike/{id}", func(w http.ResponseWriter, req *http.Request) {
 		ctx := getContextWithSession(context.Background(), req)
+		ctx = context.WithValue(ctx, "csrf_token", req.FormValue("csrf_token"))
+
 		id, _ := mux.Vars(req)["id"]
 		retweetedByID := req.FormValue("retweeted_by_id")
 
@@ -198,6 +202,8 @@ func NewHandler(s Service, staticDir string) http.Handler {
 
 	r.HandleFunc("/retweet/{id}", func(w http.ResponseWriter, req *http.Request) {
 		ctx := getContextWithSession(context.Background(), req)
+		ctx = context.WithValue(ctx, "csrf_token", req.FormValue("csrf_token"))
+
 		id, _ := mux.Vars(req)["id"]
 		retweetedByID := req.FormValue("retweeted_by_id")
 
@@ -217,6 +223,8 @@ func NewHandler(s Service, staticDir string) http.Handler {
 
 	r.HandleFunc("/unretweet/{id}", func(w http.ResponseWriter, req *http.Request) {
 		ctx := getContextWithSession(context.Background(), req)
+		ctx = context.WithValue(ctx, "csrf_token", req.FormValue("csrf_token"))
+
 		id, _ := mux.Vars(req)["id"]
 		retweetedByID := req.FormValue("retweeted_by_id")
 
@@ -236,6 +244,8 @@ func NewHandler(s Service, staticDir string) http.Handler {
 
 	r.HandleFunc("/fluoride/like/{id}", func(w http.ResponseWriter, req *http.Request) {
 		ctx := getContextWithSession(context.Background(), req)
+		ctx = context.WithValue(ctx, "csrf_token", req.FormValue("csrf_token"))
+
 		id, _ := mux.Vars(req)["id"]
 		count, err := s.Like(ctx, w, nil, id)
 		if err != nil {
@@ -252,6 +262,8 @@ func NewHandler(s Service, staticDir string) http.Handler {
 
 	r.HandleFunc("/fluoride/unlike/{id}", func(w http.ResponseWriter, req *http.Request) {
 		ctx := getContextWithSession(context.Background(), req)
+		ctx = context.WithValue(ctx, "csrf_token", req.FormValue("csrf_token"))
+
 		id, _ := mux.Vars(req)["id"]
 		count, err := s.UnLike(ctx, w, nil, id)
 		if err != nil {
@@ -268,6 +280,8 @@ func NewHandler(s Service, staticDir string) http.Handler {
 
 	r.HandleFunc("/fluoride/retweet/{id}", func(w http.ResponseWriter, req *http.Request) {
 		ctx := getContextWithSession(context.Background(), req)
+		ctx = context.WithValue(ctx, "csrf_token", req.FormValue("csrf_token"))
+
 		id, _ := mux.Vars(req)["id"]
 		count, err := s.Retweet(ctx, w, nil, id)
 		if err != nil {
@@ -284,6 +298,8 @@ func NewHandler(s Service, staticDir string) http.Handler {
 
 	r.HandleFunc("/fluoride/unretweet/{id}", func(w http.ResponseWriter, req *http.Request) {
 		ctx := getContextWithSession(context.Background(), req)
+		ctx = context.WithValue(ctx, "csrf_token", req.FormValue("csrf_token"))
+
 		id, _ := mux.Vars(req)["id"]
 		count, err := s.UnRetweet(ctx, w, nil, id)
 		if err != nil {
@@ -299,14 +315,16 @@ func NewHandler(s Service, staticDir string) http.Handler {
 	}).Methods(http.MethodPost)
 
 	r.HandleFunc("/post", func(w http.ResponseWriter, req *http.Request) {
-		ctx := getContextWithSession(context.Background(), req)
-
 		err := req.ParseMultipartForm(4 << 20)
 		if err != nil {
 			s.ServeErrorPage(ctx, w, nil, err)
 			return
 		}
 
+		ctx := getContextWithSession(context.Background(), req)
+		ctx = context.WithValue(ctx, "csrf_token",
+			getMultipartFormValue(req.MultipartForm, "csrf_token"))
+
 		content := getMultipartFormValue(req.MultipartForm, "content")
 		replyToID := getMultipartFormValue(req.MultipartForm, "reply_to_id")
 		format := getMultipartFormValue(req.MultipartForm, "format")
@@ -358,6 +376,7 @@ func NewHandler(s Service, staticDir string) http.Handler {
 
 	r.HandleFunc("/follow/{id}", func(w http.ResponseWriter, req *http.Request) {
 		ctx := getContextWithSession(context.Background(), req)
+		ctx = context.WithValue(ctx, "csrf_token", req.FormValue("csrf_token"))
 
 		id, _ := mux.Vars(req)["id"]
 
@@ -373,6 +392,7 @@ func NewHandler(s Service, staticDir string) http.Handler {
 
 	r.HandleFunc("/unfollow/{id}", func(w http.ResponseWriter, req *http.Request) {
 		ctx := getContextWithSession(context.Background(), req)
+		ctx = context.WithValue(ctx, "csrf_token", req.FormValue("csrf_token"))
 
 		id, _ := mux.Vars(req)["id"]
 
@@ -442,6 +462,7 @@ func NewHandler(s Service, staticDir string) http.Handler {
 
 	r.HandleFunc("/settings", func(w http.ResponseWriter, req *http.Request) {
 		ctx := getContextWithSession(context.Background(), req)
+		ctx = context.WithValue(ctx, "csrf_token", req.FormValue("csrf_token"))
 
 		visibility := req.FormValue("visibility")
 		copyScope := req.FormValue("copy_scope") == "true"

static/fluoride.js

@@ -16,7 +16,14 @@ var reverseActions = {
 	"unretweet": "retweet"
 };
 
-function http(method, url, success, error) {
+function getCSRFToken() {
+	var tag = document.querySelector("meta[name='csrf_token']")
+	if (tag)
+		return tag.getAttribute("content");
+	return "";
+}
+
+function http(method, url, body, type, success, error) {
 	var req = new XMLHttpRequest();
 	req.onload = function() {
 		if (this.status === 200 && typeof success === "function") {
@@ -31,14 +38,15 @@ function http(method, url, success, error) {
 		}
 	};
 	req.open(method, url);
-	req.send();
+	req.setRequestHeader("Content-Type", type);
+	req.send(body);
 }
 
 function updateActionForm(id, f, action) {
 	if (Array.from(document.body.classList).indexOf("dark") > -1) {
-		f.children[1].src = actionIcons["dark-" + action];
+		f.querySelector(".icon").src = actionIcons["dark-" + action];
 	} else {
-		f.children[1].src = actionIcons[action];
+		f.querySelector(".icon").src = actionIcons[action];
 	}
 	f.action = "/" + action + "/" + id;
 	f.dataset.action = action;
@@ -54,7 +62,9 @@ function handleLikeForm(id, f) {
 			updateActionForm(id, f, reverseActions[action]);
 		});
 
-		http("POST", "/fluoride/" + action + "/" + id, function(res, type) {
+		var body = "csrf_token=" + encodeURIComponent(getCSRFToken());
+		var contentType = "application/x-www-form-urlencoded";
+		http("POST", "/fluoride/" + action + "/" + id, body, contentType, function(res, type) {
 			var data = JSON.parse(res);
 			var count = data.data;
 			if (count === 0) {
@@ -82,7 +92,9 @@ function handleRetweetForm(id, f) {
 			updateActionForm(id, f, reverseActions[action]);
 		});
 
-		http("POST", "/fluoride/" + action + "/" + id, function(res, type) {
+		var body = "csrf_token=" + encodeURIComponent(getCSRFToken());
+		var contentType = "application/x-www-form-urlencoded";
+		http("POST", "/fluoride/" + action + "/" + id, body, contentType, function(res, type) {
 			var data = JSON.parse(res);
 			var count = data.data;
 			if (count === 0) {

templates/header.tmpl

@@ -4,6 +4,9 @@
 <head>
 	<meta charset='utf-8'>
 	<meta content='width=device-width, initial-scale=1' name='viewport'>
+	{{if .CSRFToken}}
+	<meta name="csrf_token" content="{{.CSRFToken}}">
+	{{end}}
 	<title>{{if gt .NotificationCount 0}}({{.NotificationCount}}) {{end}}{{.Title}}</title>
 	<link rel="stylesheet" href="/static/main.css">
 	{{if .CustomCSS}}

templates/postform.tmpl

@@ -1,5 +1,6 @@
 {{with .Data}}
 <form class="post-form" action="/post" method="POST" enctype="multipart/form-data">
+	<input type="hidden" name="csrf_token" value="{{$.Ctx.CSRFToken}}">
 	{{if .ReplyContext}}
 	<input type="hidden" name="reply_to_id" value="{{.ReplyContext.InReplyToID}}" />
 	<label for="post-content" class="post-form-title"> Reply to {{.ReplyContext.InReplyToName}} </label>

templates/settings.tmpl

@@ -4,6 +4,7 @@
 <div class="page-title"> Settings </div>
 
 <form id="settings-form" action="/settings" method="POST">
+	<input type="hidden" name="csrf_token" value="{{$.Ctx.CSRFToken}}">
 	<div class="settings-form-field">
 		<label for="visibility"> Default scope </label>
 		<select id="visibility" name="visibility">

templates/status.tmpl

@@ -109,12 +109,14 @@
 					{{else}}
 					{{if .Reblogged}}
 					<form class="status-retweet" data-action="unretweet" action="/unretweet/{{.ID}}" method="post">
-						<input type="hidden" name="retweeted_by_id" value="{{.RetweetedByID}}" />
+						<input type="hidden" name="csrf_token" value="{{$.Ctx.CSRFToken}}">
+						<input type="hidden" name="retweeted_by_id" value="{{.RetweetedByID}}">
 						<input type="image" src="{{GetIcon "retweeted" $.Ctx.DarkMode}}" alt="undo retweet" class="icon" title="undo retweet">
 					</form>
 					{{else}}
 					<form class="status-retweet" data-action="retweet" action="/retweet/{{.ID}}" method="post">
-						<input type="hidden" name="retweeted_by_id" value="{{.RetweetedByID}}" />
+						<input type="hidden" name="csrf_token" value="{{$.Ctx.CSRFToken}}">
+						<input type="hidden" name="retweeted_by_id" value="{{.RetweetedByID}}">
 						<input type="image" src="{{GetIcon "retweet" $.Ctx.DarkMode}}" alt="retweet" class="icon" title="retweet">
 					</form>
 					{{end}}
@@ -126,12 +128,14 @@
 				<div class="status-action">
 					{{if .Favourited}}
 					<form class="status-like" data-action="unlike" action="/unlike/{{.ID}}" method="post">
-						<input type="hidden" name="retweeted_by_id" value="{{.RetweetedByID}}" />
+						<input type="hidden" name="csrf_token" value="{{$.Ctx.CSRFToken}}">
+						<input type="hidden" name="retweeted_by_id" value="{{.RetweetedByID}}">
 						<input type="image" src="{{GetIcon "liked" $.Ctx.DarkMode}}" alt="unlike" class="icon" title="unlike">
 					</form>
 					{{else}}
 					<form class="status-like" data-action="like" action="/like/{{.ID}}" method="post">
-						<input type="hidden" name="retweeted_by_id" value="{{.RetweetedByID}}" />
+						<input type="hidden" name="csrf_token" value="{{$.Ctx.CSRFToken}}">
+						<input type="hidden" name="retweeted_by_id" value="{{.RetweetedByID}}">
 						<input type="image" src="{{GetIcon "star-o" $.Ctx.DarkMode}}" alt="like" class="icon" title="like">
 					</form>
 					{{end}}

templates/user.tmpl

@@ -22,16 +22,19 @@
 			<span> {{if .User.Pleroma.Relationship.FollowedBy}} follows you - {{end}} </span>  
 			{{if .User.Pleroma.Relationship.Following}} 
 			<form class="d-inline" action="/unfollow/{{.User.ID}}" method="post">
+				<input type="hidden" name="csrf_token" value="{{$.Ctx.CSRFToken}}">
 				<input type="submit" value="unfollow" class="btn-link">
 			</form>
 			{{end}} 
 			{{if .User.Pleroma.Relationship.Requested}} 
 			<form class="d-inline" action="/unfollow/{{.User.ID}}" method="post">
+				<input type="hidden" name="csrf_token" value="{{$.Ctx.CSRFToken}}">
 				<input type="submit" value="cancel request" class="btn-link">
 			</form>
 			{{end}} 
 			{{if not .User.Pleroma.Relationship.Following}} 
 			<form class="d-inline" action="/follow/{{.User.ID}}" method="post">
+				<input type="hidden" name="csrf_token" value="{{$.Ctx.CSRFToken}}">
 				<input type="submit" value="{{if .User.Pleroma.Relationship.Requested}}resend request{{else}}follow{{end}}" class="btn-link">
 			</form>
 			{{end}} 

util/rand.go

@@ -20,3 +20,7 @@ func NewRandId(n int) string {
 func NewSessionId() string {
 	return NewRandId(24)
 }
+
+func NewCSRFToken() string {
+	return NewRandId(24)
+}