Add CSRF prevention for /signout

This commit is contained in:
Omar Roth 2018-11-08 17:42:25 -06:00
parent 28f564ee4c
commit 8e6bee75e7
3 changed files with 25 additions and 7 deletions

View file

@ -142,6 +142,11 @@ before_all do |env|
user = PG_DB.query_one?("SELECT * FROM users WHERE $1 = ANY(id)", sid, as: User)
if user
challenge, token = create_response(user.email, "sign_out", HMAC_KEY, 1.week)
env.set "challenge", challenge
env.set "token", token
env.set "user", user
env.set "sid", sid
end
@ -896,21 +901,34 @@ post "/login" do |env|
end
end
# TODO: Update this with using the same method for /clear_watch_history to prevent CSRF
get "/signout" do |env|
user = env.get? "user"
referer = get_referer(env)
env.request.cookies.each do |cookie|
cookie.expires = Time.new(1990, 1, 1)
if user
user = user.as(User)
challenge = env.params.query["challenge"]?
token = env.params.query["token"]?
begin
validate_response(challenge, token, user.email, "sign_out", HMAC_KEY)
rescue ex
error_message = ex.message
next templated "error"
end
if env.get? "user"
user = env.get("user").as(User)
sid = env.get("sid").as(String)
PG_DB.exec("UPDATE users SET id = array_remove(id, $1) WHERE email = $2", sid, user.email)
env.request.cookies.each do |cookie|
cookie.expires = Time.new(1990, 1, 1)
end
env.request.cookies.add_response_headers(env.response.headers)
end
env.redirect referer
end

View file

@ -390,9 +390,9 @@ def extract_items(nodeset, ucid = nil)
return items
end
def create_response(user_id, operation, key)
def create_response(user_id, operation, key, expire = 6.hours)
expire = Time.now + expire
nonce = Random::Secure.hex(4)
expire = Time.now + 6.hours
challenge = "#{expire.to_unix}-#{nonce}-#{user_id}-#{operation}"
token = OpenSSL::HMAC.digest(:sha256, key, challenge)

View file

@ -67,7 +67,7 @@
</a>
</div>
<div class="pure-u-1-4">
<a href="/signout?referer=<%= env.get?("current_page") %>" class="pure-menu-heading">Sign out</a>
<a href="/signout?referer=<%= env.get?("current_page") %>&token=<%= env.get?("token") %>&challenge=<%= env.get?("challenge") %>" class="pure-menu-heading">Sign out</a>
</div>
<% else %>
<a href="/login?referer=<%= env.get?("current_page") %>" class="pure-menu-heading">Login</a>