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376 lines
13 KiB
376 lines
13 KiB
use actix_web::client::{Client, ClientRequest};
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use actix_web::{http, web, HttpRequest, HttpResponse};
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use actix_session::Session;
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use askama::Template;
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use chrono::Utc;
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use csrf::{AesGcmCsrfProtection, CsrfProtection};
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use std::time::Duration;
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use url::Url;
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use crate::account::*;
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use crate::config::get_csrf_key;
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use crate::config::PAYLOAD_LIMIT;
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use crate::config::PROXY_TIMEOUT;
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use crate::database::methods::InsertableForm;
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use crate::database::structs::Form;
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use crate::debug;
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use crate::errors::{crash, TrainCrash};
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use crate::sniff::*;
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use crate::templates::*;
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use crate::DbPool;
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use crate::CONFIG;
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pub async fn forward(
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req: HttpRequest,
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body: web::Bytes,
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url: web::Data<Url>,
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client: web::Data<Client>,
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) -> Result<HttpResponse, TrainCrash> {
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let route = req.uri().path();
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// if check_route returns true,
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// the user supposedly tried to access a restricted page.
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// They get redirected to the main page.
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if route.starts_with("/apps/files") {
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// exception for /apps/files: always redirect to /apps/forms
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debug(&format!("Files route blocked: {}", route));
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return Ok(web_redir("/apps/forms").await.map_err(|e| {
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eprintln!("error_redirect: {}", e);
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crash(get_lang(&req), "error_redirect")
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})?);
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} else if check_route(route) {
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debug(&format!("Restricted route blocked: {}", route));
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return Ok(web_redir("/").await.map_err(|e| {
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eprintln!("error_redirect: {}", e);
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crash(get_lang(&req), "error_redirect")
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})?);
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}
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let forwarded_req = forge_from(route, &req, &url, &client);
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// check the request before sending it
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// (prevents the user from sending some specific POST requests)
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if check_request(route, &body) {
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debug(&format!(
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"Restricted request: {}",
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String::from_utf8_lossy(&body)
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));
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return Err(crash(get_lang(&req), "error_dirtyhacker"));
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}
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// send the request to the Nextcloud instance
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let mut res = forwarded_req.send_body(body).await.map_err(|e| {
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eprintln!("error_forward_resp: {}", e);
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crash(get_lang(&req), "error_forward_req")
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})?;
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let mut client_resp = HttpResponse::build(res.status());
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// remove connection as per the spec
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// and content-encoding since we have to decompress the traffic to edit it
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// and basic-auth, because this feature is not needed.
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for (header_name, header_value) in res
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.headers()
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.iter()
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.filter(|(h, _)| *h != "connection" && *h != "content-encoding")
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{
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client_resp.header(header_name.clone(), header_value.clone());
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}
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// sparing the use of a mutable body when not needed
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// For now, the body only needs to be modified when the route
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// is "create a new form" route
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if route == "/ocs/v2.php/apps/forms/api/v1/form" {
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// retreive the body from the request result
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let response_body = res.body().limit(PAYLOAD_LIMIT).await.map_err(|e| {
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eprintln!("error_forward_resp: {}", e);
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crash(get_lang(&req), "error_forward_resp")
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})?;
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// if a new form is created, automatically set some fields.
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// this is very hackish but it works! for now.
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let form_id = check_new_form(&response_body);
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if form_id > 0 {
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debug(&format!(
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"New form. Forging request to set isAnonymous for id {}",
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form_id
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));
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let forged_body = format!(
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r#"{{"id":{},"keyValuePairs":{{"isAnonymous":true}}}}"#,
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form_id
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);
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let update_req = forge_from(
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"/ocs/v2.php/apps/forms/api/v1/form/update",
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&req,
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&url,
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&client,
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)
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.set_header("content-length", forged_body.len())
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.set_header("content-type", "application/json;charset=utf-8");
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let res = update_req.send_body(forged_body).await.map_err(|e| {
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eprintln!("error_forward_isanon: {}", e);
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crash(get_lang(&req), "error_forward_isanon")
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})?;
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debug(&format!("(new_form) Request returned {}", res.status()));
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}
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Ok(client_resp.body(response_body).await.map_err(|e| {
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eprintln!("error_forward_clientresp_newform: {}", e);
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crash(get_lang(&req), "error_forward_clientresp_newform")
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})?)
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} else {
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Ok(
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client_resp.body(res.body().limit(PAYLOAD_LIMIT).await.map_err(|e| {
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eprintln!("error_forward_clientresp_newform: {}", e);
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crash(get_lang(&req), "error_forward_clientresp_std")
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})?),
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)
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}
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// check the response before returning it (unused)
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/*if check_response(route, &response_body) {
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return Ok(web_redir("/"));
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}*/
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}
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#[derive(Deserialize)]
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pub struct LoginToken {
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pub token: String,
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}
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#[derive(Deserialize)]
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pub struct CsrfToken {
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pub csrf_token: String,
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}
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pub async fn forward_login(
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req: HttpRequest,
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s: Session,
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params: web::Path<LoginToken>,
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client: web::Data<Client>,
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dbpool: web::Data<DbPool>,
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) -> Result<HttpResponse, TrainCrash> {
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// check if the provided token seems valid. If not, early return.
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if !check_token(¶ms.token) {
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debug("Incorrect admin token given in params.");
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debug(&format!("Token: {:#?}", params.token));
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return Err(crash(get_lang(&req), "error_dirtyhacker"));
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}
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let conn = dbpool.get().map_err(|e| {
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eprintln!("error_forwardlogin_db: {}", e);
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crash(get_lang(&req), "error_forwardlogin_db")
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})?;
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let moved_token = params.token.clone();
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// check if the link exists in DB. if it does, update lastvisit_at.
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let formdata = web::block(move || Form::get_from_token(¶ms.token, &conn))
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.await
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.map_err(|e| {
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eprintln!("error_forwardlogin_db_get (diesel error): {}", e);
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crash(get_lang(&req), "error_forwardlogin_db_get")
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})?
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.ok_or_else(|| {
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debug("error: Token not found.");
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crash(get_lang(&req), "error_forwardlogin_notfound")
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})?;
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// copy the token in cookies.
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s.set("sncf_admin_token", &moved_token).map_err(|e| {
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eprintln!("error_login_setcookie (in login): {}", e);
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crash(get_lang(&req),"error_login_setcookie")
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})?;
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// if the user is already logged in, skip the login process
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// we don't care if someone edits their cookies, Nextcloud will properly
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// check them anyway
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if let Some(nc_username) = is_logged_in(&req) {
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if nc_username.contains(&format!("nc_username={}", formdata.nc_username)) {
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return Ok(web_redir("/apps/forms").await.map_err(|e| {
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eprintln!("error_redirect (1:/apps/forms/): {}", e);
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crash(get_lang(&req), "error_redirect")
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})?);
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}
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}
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// try to log the user in with DB data, then redirect.
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login(&client, &req, &formdata.nc_username, &formdata.nc_password).await
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}
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// creates a NC account using a random name and password.
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// the account gets associated with a token in sqlite DB.
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// POST /link route
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pub async fn forward_register(
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req: HttpRequest,
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s: Session,
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csrf_post: web::Form<CsrfToken>,
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client: web::Data<Client>,
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dbpool: web::Data<DbPool>,
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) -> Result<HttpResponse, TrainCrash> {
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let lang = get_lang(&req);
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// do not check for existing admin tokens and force a new registration
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// check if the csrf token is OK
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let cookie_csrf_token = s.get::<String>("sncf_csrf_token").map_err(|e| {
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eprintln!("error_csrf_cookie: {}", e);
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crash(get_lang(&req), "error_csrf_cookie")
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})?;
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if let Some(cookie_token) = cookie_csrf_token {
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let raw_ctoken =
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base64::decode_config(cookie_token.as_bytes(), base64::URL_SAFE_NO_PAD).map_err(
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|e| {
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eprintln!("error_csrf_cookie (base64): {}", e);
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crash(get_lang(&req), "error_csrf_cookie")
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},
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)?;
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let raw_token =
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base64::decode_config(csrf_post.csrf_token.as_bytes(), base64::URL_SAFE_NO_PAD)
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.map_err(|e| {
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eprintln!("error_csrf_token (base64): {}", e);
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crash(get_lang(&req), "error_csrf_token")
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})?;
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let seed = AesGcmCsrfProtection::from_key(get_csrf_key());
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let parsed_token = seed.parse_token(&raw_token).expect("error: token not parsed");
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let parsed_cookie = seed.parse_cookie(&raw_ctoken).expect("error: cookie not parsed");
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if !seed.verify_token_pair(&parsed_token, &parsed_cookie) {
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debug("warn: CSRF token doesn't match.");
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return Err(crash(lang, "error_csrf_token"));
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}
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} else {
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debug("warn: missing CSRF token.");
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return Err(crash(lang, "error_csrf_cookie"));
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}
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let nc_username = gen_name();
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println!("gen_name: {}", nc_username);
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let nc_password = gen_token(45);
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// attempts to create the account
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create_account(&client, &nc_username, &nc_password, lang.clone()).await?;
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debug(&format!("Created user {}", nc_username));
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let conn = dbpool.get().map_err(|e| {
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eprintln!("error_forwardregister_pool: {}", e);
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crash(lang.clone(), "error_forwardregister_pool")
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})?;
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let token = gen_token(45);
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let token_mv = token.clone();
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// store the result in DB
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let form_result = web::block(move || {
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Form::insert(
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InsertableForm {
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created_at: Utc::now().naive_utc(),
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lastvisit_at: Utc::now().naive_utc(),
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token: token_mv,
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nc_username,
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nc_password,
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},
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&conn,
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)
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})
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.await;
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if form_result.is_err() {
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return Err(crash(lang, "error_forwardregister_db"));
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}
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s.set("sncf_admin_token", &token).map_err(|e| {
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eprintln!("error_login_setcookie (in register): {}", e);
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crash(lang.clone(), "error_login_setcookie")
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})?;
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Ok(HttpResponse::Ok()
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.content_type("text/html")
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.body(
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TplLink {
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lang: &lang,
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admin_token: &token,
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config: &CONFIG,
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}
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.render()
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.map_err(|e| {
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eprintln!("error_tplrender (TplLink): {}", e);
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crash(lang.clone(), "error_tplrender")
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})?,
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)
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.await
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.map_err(|e| {
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eprintln!("error_tplrender_resp (TplLink): {}", e);
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crash(lang, "error_tplrender_resp")
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})?)
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}
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// create a new query destined to the nextcloud instance
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// needed to forward any query
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fn forge_from(
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route: &str,
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req: &HttpRequest,
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url: &web::Data<Url>,
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client: &web::Data<Client>,
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) -> ClientRequest {
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let mut new_url = url.get_ref().clone();
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new_url.set_path(route);
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new_url.set_query(req.uri().query());
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// insert forwarded header if we can
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let mut forwarded_req = client
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.request_from(new_url.as_str(), req.head())
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.timeout(Duration::new(PROXY_TIMEOUT, 0));
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// attempt to remove basic-auth header
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forwarded_req.headers_mut().remove("authorization");
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if let Some(addr) = req.head().peer_addr {
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forwarded_req.header("x-forwarded-for", format!("{}", addr.ip()))
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} else {
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forwarded_req
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}
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}
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fn web_redir(location: &str) -> HttpResponse {
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HttpResponse::SeeOther()
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.header(http::header::LOCATION, location)
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.finish()
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}
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pub async fn index(req: HttpRequest, s: Session) -> Result<HttpResponse, TrainCrash> {
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let seed = AesGcmCsrfProtection::from_key(get_csrf_key());
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let (csrf_token, csrf_cookie) = seed
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.generate_token_pair(None, 43200)
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.expect("couldn't generate token/cookie pair");
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s.set("sncf_csrf_token", &base64::encode_config(&csrf_cookie.value(), base64::URL_SAFE_NO_PAD)).map_err(|e| {
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eprintln!("error_login_setcookie (in index): {}", e);
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crash(get_lang(&req), "error_login_setcookie")
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})?;
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let cookie_admin_token = s.get::<String>("sncf_admin_token").map_err(|e| {
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eprintln!("error_forwardregister_tokenparse (index): {}", e);
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crash(get_lang(&req), "error_forwardregister_tokenparse")
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})?;
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Ok(HttpResponse::Ok()
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.content_type("text/html")
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.body(
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TplIndex {
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lang: &get_lang(&req),
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csrf_token: &base64::encode_config(&csrf_token.value(), base64::URL_SAFE_NO_PAD),
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sncf_admin_token: cookie_admin_token,
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}
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.render()
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.map_err(|e| {
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eprintln!("error_tplrender (TplIndex): {}", e);
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crash(get_lang(&req), "error_tplrender")
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})?,
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)
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.await
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.map_err(|e| {
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eprintln!("error_tplrender_resp (TplIndex): {}", e);
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crash(get_lang(&req), "error_tplrender_resp")
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})?)
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}
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