Simple Nextcloud Forms https://forms.42l.fr
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use actix_web::client::{Client, ClientRequest};
use actix_web::{http, web, HttpRequest, HttpResponse};
use actix_session::Session;
use askama::Template;
use chrono::Utc;
use csrf::{AesGcmCsrfProtection, CsrfProtection};
use std::time::Duration;
use url::Url;
use crate::account::*;
use crate::config::get_csrf_key;
use crate::config::PAYLOAD_LIMIT;
use crate::config::PROXY_TIMEOUT;
use crate::database::methods::InsertableForm;
use crate::database::structs::Form;
use crate::debug;
use crate::errors::{crash, TrainCrash};
use crate::sniff::*;
use crate::templates::*;
use crate::DbPool;
use crate::CONFIG;
pub async fn forward(
req: HttpRequest,
body: web::Bytes,
url: web::Data<Url>,
client: web::Data<Client>,
) -> Result<HttpResponse, TrainCrash> {
let route = req.uri().path();
// if check_route returns true,
// the user supposedly tried to access a restricted page.
// They get redirected to the main page.
if route.starts_with("/apps/files") {
// exception for /apps/files: always redirect to /apps/forms
debug(&format!("Files route blocked: {}", route));
return Ok(web_redir("/apps/forms").await.map_err(|e| {
eprintln!("error_redirect: {}", e);
crash(get_lang(&req), "error_redirect")
})?);
} else if check_route(route) {
debug(&format!("Restricted route blocked: {}", route));
return Ok(web_redir("/").await.map_err(|e| {
eprintln!("error_redirect: {}", e);
crash(get_lang(&req), "error_redirect")
})?);
}
let forwarded_req = forge_from(route, &req, &url, &client);
// check the request before sending it
// (prevents the user from sending some specific POST requests)
if check_request(route, &body) {
debug(&format!(
"Restricted request: {}",
String::from_utf8_lossy(&body)
));
return Err(crash(get_lang(&req), "error_dirtyhacker"));
}
// send the request to the Nextcloud instance
let mut res = forwarded_req.send_body(body).await.map_err(|e| {
eprintln!("error_forward_resp: {}", e);
crash(get_lang(&req), "error_forward_req")
})?;
let mut client_resp = HttpResponse::build(res.status());
// remove connection as per the spec
// and content-encoding since we have to decompress the traffic to edit it
// and basic-auth, because this feature is not needed.
for (header_name, header_value) in res
.headers()
.iter()
.filter(|(h, _)| *h != "connection" && *h != "content-encoding")
{
client_resp.header(header_name.clone(), header_value.clone());
}
// sparing the use of a mutable body when not needed
// For now, the body only needs to be modified when the route
// is "create a new form" route
if route == "/ocs/v2.php/apps/forms/api/v1/form" {
// retreive the body from the request result
let response_body = res.body().limit(PAYLOAD_LIMIT).await.map_err(|e| {
eprintln!("error_forward_resp: {}", e);
crash(get_lang(&req), "error_forward_resp")
})?;
// if a new form is created, automatically set some fields.
// this is very hackish but it works! for now.
let form_id = check_new_form(&response_body);
if form_id > 0 {
debug(&format!(
"New form. Forging request to set isAnonymous for id {}",
form_id
));
let forged_body = format!(
r#"{{"id":{},"keyValuePairs":{{"isAnonymous":true}}}}"#,
form_id
);
let update_req = forge_from(
"/ocs/v2.php/apps/forms/api/v1/form/update",
&req,
&url,
&client,
)
.set_header("content-length", forged_body.len())
.set_header("content-type", "application/json;charset=utf-8");
let res = update_req.send_body(forged_body).await.map_err(|e| {
eprintln!("error_forward_isanon: {}", e);
crash(get_lang(&req), "error_forward_isanon")
})?;
debug(&format!("(new_form) Request returned {}", res.status()));
}
Ok(client_resp.body(response_body).await.map_err(|e| {
eprintln!("error_forward_clientresp_newform: {}", e);
crash(get_lang(&req), "error_forward_clientresp_newform")
})?)
} else {
Ok(
client_resp.body(res.body().limit(PAYLOAD_LIMIT).await.map_err(|e| {
eprintln!("error_forward_clientresp_newform: {}", e);
crash(get_lang(&req), "error_forward_clientresp_std")
})?),
)
}
// check the response before returning it (unused)
/*if check_response(route, &response_body) {
return Ok(web_redir("/"));
}*/
}
#[derive(Deserialize)]
pub struct LoginToken {
pub token: String,
}
#[derive(Deserialize)]
pub struct CsrfToken {
pub csrf_token: String,
}
pub async fn forward_login(
req: HttpRequest,
s: Session,
params: web::Path<LoginToken>,
client: web::Data<Client>,
dbpool: web::Data<DbPool>,
) -> Result<HttpResponse, TrainCrash> {
// check if the provided token seems valid. If not, early return.
if !check_token(&params.token) {
debug("Incorrect admin token given in params.");
debug(&format!("Token: {:#?}", params.token));
return Err(crash(get_lang(&req), "error_dirtyhacker"));
}
let conn = dbpool.get().map_err(|e| {
eprintln!("error_forwardlogin_db: {}", e);
crash(get_lang(&req), "error_forwardlogin_db")
})?;
let moved_token = params.token.clone();
// check if the link exists in DB. if it does, update lastvisit_at.
let formdata = web::block(move || Form::get_from_token(&params.token, &conn))
.await
.map_err(|e| {
eprintln!("error_forwardlogin_db_get (diesel error): {}", e);
crash(get_lang(&req), "error_forwardlogin_db_get")
})?
.ok_or_else(|| {
debug("error: Token not found.");
crash(get_lang(&req), "error_forwardlogin_notfound")
})?;
// copy the token in cookies.
s.set("sncf_admin_token", &moved_token).map_err(|e| {
eprintln!("error_login_setcookie (in login): {}", e);
crash(get_lang(&req),"error_login_setcookie")
})?;
// if the user is already logged in, skip the login process
// we don't care if someone edits their cookies, Nextcloud will properly
// check them anyway
if let Some(nc_username) = is_logged_in(&req) {
if nc_username.contains(&format!("nc_username={}", formdata.nc_username)) {
return Ok(web_redir("/apps/forms").await.map_err(|e| {
eprintln!("error_redirect (1:/apps/forms/): {}", e);
crash(get_lang(&req), "error_redirect")
})?);
}
}
// try to log the user in with DB data, then redirect.
login(&client, &req, &formdata.nc_username, &formdata.nc_password).await
}
// creates a NC account using a random name and password.
// the account gets associated with a token in sqlite DB.
// POST /link route
pub async fn forward_register(
req: HttpRequest,
s: Session,
csrf_post: web::Form<CsrfToken>,
client: web::Data<Client>,
dbpool: web::Data<DbPool>,
) -> Result<HttpResponse, TrainCrash> {
let lang = get_lang(&req);
// do not check for existing admin tokens and force a new registration
// check if the csrf token is OK
let cookie_csrf_token = s.get::<String>("sncf_csrf_token").map_err(|e| {
eprintln!("error_csrf_cookie: {}", e);
crash(get_lang(&req), "error_csrf_cookie")
})?;
if let Some(cookie_token) = cookie_csrf_token {
let raw_ctoken =
base64::decode_config(cookie_token.as_bytes(), base64::URL_SAFE_NO_PAD).map_err(
|e| {
eprintln!("error_csrf_cookie (base64): {}", e);
crash(get_lang(&req), "error_csrf_cookie")
},
)?;
let raw_token =
base64::decode_config(csrf_post.csrf_token.as_bytes(), base64::URL_SAFE_NO_PAD)
.map_err(|e| {
eprintln!("error_csrf_token (base64): {}", e);
crash(get_lang(&req), "error_csrf_token")
})?;
let seed = AesGcmCsrfProtection::from_key(get_csrf_key());
let parsed_token = seed.parse_token(&raw_token).expect("error: token not parsed");
let parsed_cookie = seed.parse_cookie(&raw_ctoken).expect("error: cookie not parsed");
if !seed.verify_token_pair(&parsed_token, &parsed_cookie) {
debug("warn: CSRF token doesn't match.");
return Err(crash(lang, "error_csrf_token"));
}
} else {
debug("warn: missing CSRF token.");
return Err(crash(lang, "error_csrf_cookie"));
}
let nc_username = gen_name();
println!("gen_name: {}", nc_username);
let nc_password = gen_token(45);
// attempts to create the account
create_account(&client, &nc_username, &nc_password, lang.clone()).await?;
debug(&format!("Created user {}", nc_username));
let conn = dbpool.get().map_err(|e| {
eprintln!("error_forwardregister_pool: {}", e);
crash(lang.clone(), "error_forwardregister_pool")
})?;
let token = gen_token(45);
let token_mv = token.clone();
// store the result in DB
let form_result = web::block(move || {
Form::insert(
InsertableForm {
created_at: Utc::now().naive_utc(),
lastvisit_at: Utc::now().naive_utc(),
token: token_mv,
nc_username,
nc_password,
},
&conn,
)
})
.await;
if form_result.is_err() {
return Err(crash(lang, "error_forwardregister_db"));
}
s.set("sncf_admin_token", &token).map_err(|e| {
eprintln!("error_login_setcookie (in register): {}", e);
crash(lang.clone(), "error_login_setcookie")
})?;
Ok(HttpResponse::Ok()
.content_type("text/html")
.body(
TplLink {
lang: &lang,
admin_token: &token,
config: &CONFIG,
}
.render()
.map_err(|e| {
eprintln!("error_tplrender (TplLink): {}", e);
crash(lang.clone(), "error_tplrender")
})?,
)
.await
.map_err(|e| {
eprintln!("error_tplrender_resp (TplLink): {}", e);
crash(lang, "error_tplrender_resp")
})?)
}
// create a new query destined to the nextcloud instance
// needed to forward any query
fn forge_from(
route: &str,
req: &HttpRequest,
url: &web::Data<Url>,
client: &web::Data<Client>,
) -> ClientRequest {
let mut new_url = url.get_ref().clone();
new_url.set_path(route);
new_url.set_query(req.uri().query());
// insert forwarded header if we can
let mut forwarded_req = client
.request_from(new_url.as_str(), req.head())
.timeout(Duration::new(PROXY_TIMEOUT, 0));
// attempt to remove basic-auth header
forwarded_req.headers_mut().remove("authorization");
if let Some(addr) = req.head().peer_addr {
forwarded_req.header("x-forwarded-for", format!("{}", addr.ip()))
} else {
forwarded_req
}
}
fn web_redir(location: &str) -> HttpResponse {
HttpResponse::SeeOther()
.header(http::header::LOCATION, location)
.finish()
}
pub async fn index(req: HttpRequest, s: Session) -> Result<HttpResponse, TrainCrash> {
let seed = AesGcmCsrfProtection::from_key(get_csrf_key());
let (csrf_token, csrf_cookie) = seed
.generate_token_pair(None, 43200)
.expect("couldn't generate token/cookie pair");
s.set("sncf_csrf_token", &base64::encode_config(&csrf_cookie.value(), base64::URL_SAFE_NO_PAD)).map_err(|e| {
eprintln!("error_login_setcookie (in index): {}", e);
crash(get_lang(&req), "error_login_setcookie")
})?;
let cookie_admin_token = s.get::<String>("sncf_admin_token").map_err(|e| {
eprintln!("error_forwardregister_tokenparse (index): {}", e);
crash(get_lang(&req), "error_forwardregister_tokenparse")
})?;
Ok(HttpResponse::Ok()
.content_type("text/html")
.body(
TplIndex {
lang: &get_lang(&req),
csrf_token: &base64::encode_config(&csrf_token.value(), base64::URL_SAFE_NO_PAD),
sncf_admin_token: cookie_admin_token,
}
.render()
.map_err(|e| {
eprintln!("error_tplrender (TplIndex): {}", e);
crash(get_lang(&req), "error_tplrender")
})?,
)
.await
.map_err(|e| {
eprintln!("error_tplrender_resp (TplIndex): {}", e);
crash(get_lang(&req), "error_tplrender_resp")
})?)
}