* [FEATURE] Add auth query param to /api/verify (#1353)
When `/api/verify` is called with `?auth=basic`, use the standard
Authorization header instead of Proxy-Authorization.
* [FIX] Better basic auth error reporting
* [FIX] Return 401 when using basic auth instead of redirecting
* [TESTS] Add tests for auth=basic query param
* [DOCS] Mention auth=basic argument and provide nginx example
* docs: add/adjust basic auth query arg docs for proxies
Co-authored-by: Amir Zarrinkafsh <nightah@me.com>
* Adding the Session-Username header to the /api/verify endpoint when using cookie auth will check the value stored in the session store for the username and the header value are the same.
* use strings.EqualFold to compare case insensitively
* add docs
* add unit tests
* invalidate session if it is theoretically hijacked and log it as a warning (can only be determined if the header doesn't match the cookie)
* add example PAM script
* go mod tidy
* go mod bump to 1.15
