[yew-devel] [PATCH yew-comp] http wasm client: load csrf token from global Proxmox object

[Shannon Sterz <s.sterz@proxmox.com>]

previously csrf tokens were only loaded from session storage. this
could lead to two scenarios:

- the csrf token expired while the newer authentication ticket was
still valid.
- when restoring a session, session cookies were restored, but session
storage seemingly isn't always restored (tested in chromium and ff).
this lead to no csrf token being loaded here, the
`unwrap_or_default()` would then return the empty string as a csrf
token.

both scenarios would lead to a situation where a valid authentication
cookie was present, but the csrf token was empty or expired. the
result is that all GET requests would work properly, as we don't check
csrf tokens there. however, the first non-GET request would lead to a
logout.

to fix this, we first load the token from the Proxmox object that is
injected via a script in the index.html for all proxmox products. we
prefer this token over the one in session storage.
authentication_from_cookie (that calls the extract_auth_from_cookie
function), is and should only be called when the page was just loaded.
so the csrf token in the Proxmox object will always be fresher than the
one in the session storage.

additionally, if no csrf token can be found, return None to trigger a
fresh log in.

Signed-off-by: Shannon Sterz <s.sterz@proxmox.com>
---

tested this by opening and closing chromium and firefox after logging in
with active session restore. without this patch an empty csrf token
would be loaded (and then persisted to session storage).

note, i intentionally did not put this in load_csrf_token() in lib.rs as
that could break the assumption that it will always return the same
token last stored with store_csrf_token().

 src/http_client_wasm.rs | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/http_client_wasm.rs b/src/http_client_wasm.rs
index 25d0dd2..ae99a99 100644
--- a/src/http_client_wasm.rs
+++ b/src/http_client_wasm.rs
@@ -3,9 +3,11 @@ use std::pin::Pin;
 use std::rc::Rc;
 use std::sync::Mutex;

+use js_sys::Reflect;
 use percent_encoding::percent_decode_str;
 use serde::Serialize;
 use serde_json::Value;
+use wasm_bindgen::JsValue;

 use proxmox_client::{Error, HttpApiClient, HttpApiResponse, HttpApiResponseStream};
 use proxmox_login::{Authentication, Login, Ticket, TicketResult};
@@ -55,8 +57,16 @@ fn extract_auth_from_cookie(project: &dyn ProjectInfo) -> Option<(String, String
             if key == name {
                 let items: Vec<&str> = value.split(':').take(2).collect();
                 if prefixes.contains(&items[0]) {
-                    let csrf_token = crate::load_csrf_token().unwrap_or_default();
-                    return Some((value.to_string(), csrf_token));
+                    let window = gloo_utils::window();
+                    if let Ok(proxmox) = Reflect::get(&window, &JsValue::from_str("Proxmox")) {
+                        if let Ok(token) =
+                            Reflect::get(&proxmox, &JsValue::from_str("CSRFPreventionToken"))
+                        {
+                            return token.as_string().map(|t| (value.to_string(), t));
+                        }
+                    }
+
+                    return crate::load_csrf_token().map(|t| (value.to_string(), t));
                 }
             }
         }
--
2.47.3



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