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| 1 | +use std::{ |
| 2 | + borrow::BorrowMut, |
| 3 | + collections::HashMap, |
| 4 | + future::pending, |
| 5 | + os::fd::{AsRawFd, FromRawFd}, |
| 6 | + sync::{Arc, Mutex}, |
| 7 | +}; |
| 8 | + |
| 9 | +use async_std::io::WriteExt; |
| 10 | +use futures::FutureExt; |
| 11 | +use oo7::{ |
| 12 | + dbus::{Algorithm, Service}, |
| 13 | + zbus::{self, dbus_interface, zvariant, zvariant::Type}, |
| 14 | +}; |
| 15 | +use ring::rand::SecureRandom; |
| 16 | +use serde::Serialize; |
| 17 | +use zvariant::OwnedObjectPath; |
| 18 | + |
| 19 | +const PORTAL_SECRET_SIZE: usize = 64; |
| 20 | +const NAME: &str = "org.freedesktop.impl.portal.desktop.oo7"; |
| 21 | +const PATH: &str = "/org/freedesktop/portal/desktop"; |
| 22 | + |
| 23 | +#[derive(Serialize, PartialEq, Eq, Debug, Type)] |
| 24 | +#[doc(hidden)] |
| 25 | +enum ResponseType { |
| 26 | + Success = 0, |
| 27 | + Cancelled = 1, |
| 28 | + Other = 2, |
| 29 | +} |
| 30 | + |
| 31 | +#[derive(zbus::DBusError, Debug)] |
| 32 | +enum Error { |
| 33 | + Msg(String), |
| 34 | +} |
| 35 | + |
| 36 | +impl Error { |
| 37 | + fn new(msg: &str) -> Error { |
| 38 | + Error::Msg(msg.to_string()) |
| 39 | + } |
| 40 | +} |
| 41 | + |
| 42 | +impl From<oo7::dbus::Error> for Error { |
| 43 | + fn from(err: oo7::dbus::Error) -> Self { |
| 44 | + Error::new(&err.to_string()) |
| 45 | + } |
| 46 | +} |
| 47 | + |
| 48 | +struct Secret; |
| 49 | + |
| 50 | +#[dbus_interface(name = "org.freedesktop.impl.portal.Secret")] |
| 51 | +impl Secret { |
| 52 | + #[dbus_interface(property, name = "version")] |
| 53 | + fn version(&self) -> u32 { |
| 54 | + 0 |
| 55 | + } |
| 56 | + |
| 57 | + #[dbus_interface(out_args("response", "results"))] |
| 58 | + async fn retrieve_secret( |
| 59 | + &self, |
| 60 | + #[zbus(object_server)] object_server: &zbus::ObjectServer, |
| 61 | + handle: OwnedObjectPath, |
| 62 | + app_id: &str, |
| 63 | + fd: zvariant::Fd, |
| 64 | + _options: HashMap<&str, zvariant::Value<'_>>, |
| 65 | + ) -> Result<(ResponseType, HashMap<&str, zvariant::OwnedValue>), Error> { |
| 66 | + tracing::debug!("Got request from {app_id} with options: {_options:?}"); |
| 67 | + |
| 68 | + let (sender, receiver) = futures_channel::oneshot::channel(); |
| 69 | + |
| 70 | + if let Err(err) = Request::serve(object_server, handle.clone(), sender).await { |
| 71 | + tracing::error!("Could not register object {handle}: {err}"); |
| 72 | + } |
| 73 | + |
| 74 | + let fut_1 = async move { |
| 75 | + let res = match retrieve_secret_inner(app_id, fd).await { |
| 76 | + Ok(res) => Ok((ResponseType::Success, res)), |
| 77 | + Err(err) => { |
| 78 | + tracing::error!("could not retrieve secret: {err}"); |
| 79 | + Ok((ResponseType::Other, HashMap::new())) |
| 80 | + } |
| 81 | + }; |
| 82 | + |
| 83 | + // We do not accept Close request anymore here. |
| 84 | + tracing::debug!("Object {handle} handled"); |
| 85 | + object_server |
| 86 | + .remove::<Request, &zvariant::OwnedObjectPath>(&handle) |
| 87 | + .await |
| 88 | + .unwrap(); |
| 89 | + |
| 90 | + res |
| 91 | + }; |
| 92 | + |
| 93 | + let fut_2 = async move { |
| 94 | + receiver.await.unwrap(); |
| 95 | + Ok((ResponseType::Cancelled, HashMap::new())) |
| 96 | + }; |
| 97 | + |
| 98 | + let t1 = fut_1.fuse(); |
| 99 | + let t2 = fut_2.fuse(); |
| 100 | + |
| 101 | + futures::pin_mut!(t1, t2); |
| 102 | + |
| 103 | + futures::select! { |
| 104 | + fut_1_res = t1 => fut_1_res, |
| 105 | + fut_2_res = t2 => fut_2_res, |
| 106 | + } |
| 107 | + } |
| 108 | +} |
| 109 | + |
| 110 | +fn generate_secret() -> Result<zeroize::Zeroizing<Vec<u8>>, Error> { |
| 111 | + let mut secret = [0; PORTAL_SECRET_SIZE]; |
| 112 | + let rand = ring::rand::SystemRandom::new(); |
| 113 | + rand.fill(secret.borrow_mut()) |
| 114 | + .map_err(|err| Error::new(&err.to_string()))?; |
| 115 | + Ok(zeroize::Zeroizing::new(secret.to_vec())) |
| 116 | +} |
| 117 | + |
| 118 | +async fn retrieve_secret_inner( |
| 119 | + app_id: &str, |
| 120 | + fd: zvariant::Fd, |
| 121 | +) -> Result<HashMap<&'static str, zvariant::OwnedValue>, Error> { |
| 122 | + let service = Service::new(Algorithm::Encrypted) |
| 123 | + .await |
| 124 | + .or(Service::new(Algorithm::Plain).await)?; |
| 125 | + let collection = service.default_collection().await?; |
| 126 | + let attributes = HashMap::from([("app_id", app_id)]); |
| 127 | + |
| 128 | + let secret = if let Some(item) = collection |
| 129 | + .search_items(attributes.clone()) |
| 130 | + .await |
| 131 | + .map_err(|err| Error::new(&err.to_string()))? |
| 132 | + .first() |
| 133 | + { |
| 134 | + item.secret().await? |
| 135 | + } else { |
| 136 | + tracing::debug!("Could not find secret for {app_id}, creating one"); |
| 137 | + let secret = generate_secret()?; |
| 138 | + collection |
| 139 | + .create_item( |
| 140 | + &format!("Secret Portal token for {app_id}"), |
| 141 | + attributes, |
| 142 | + &secret, |
| 143 | + true, |
| 144 | + // TODO Find a better one. |
| 145 | + "text/plain", |
| 146 | + ) |
| 147 | + .await?; |
| 148 | + |
| 149 | + secret |
| 150 | + }; |
| 151 | + |
| 152 | + // Write the secret to the FD. |
| 153 | + let raw_fd = fd.as_raw_fd(); |
| 154 | + let mut stream = unsafe { async_std::os::unix::net::UnixStream::from_raw_fd(raw_fd) }; |
| 155 | + stream |
| 156 | + .write_all(&secret) |
| 157 | + .await |
| 158 | + .map_err(|e| Error::new(&e.to_string()))?; |
| 159 | + |
| 160 | + Ok(HashMap::new()) |
| 161 | +} |
| 162 | + |
| 163 | +#[async_std::main] |
| 164 | +async fn main() -> Result<(), zbus::Error> { |
| 165 | + tracing_subscriber::fmt::init(); |
| 166 | + |
| 167 | + let backend = Secret; |
| 168 | + let cnx = zbus::ConnectionBuilder::session()? |
| 169 | + // .name(NAME)? |
| 170 | + .serve_at(PATH, backend)? |
| 171 | + .build() |
| 172 | + .await?; |
| 173 | + // NOTE For debugging. |
| 174 | + let flags = zbus::fdo::RequestNameFlags::ReplaceExisting |
| 175 | + | zbus::fdo::RequestNameFlags::AllowReplacement; |
| 176 | + cnx.request_name_with_flags(NAME, flags).await?; |
| 177 | + |
| 178 | + loop { |
| 179 | + pending::<()>().await; |
| 180 | + } |
| 181 | +} |
| 182 | + |
| 183 | +struct Request { |
| 184 | + handle_path: zvariant::OwnedObjectPath, |
| 185 | + sender: Arc<Mutex<Option<futures_channel::oneshot::Sender<()>>>>, |
| 186 | +} |
| 187 | + |
| 188 | +#[dbus_interface(name = "org.freedesktop.impl.portal.Request")] |
| 189 | +impl Request { |
| 190 | + async fn close( |
| 191 | + &self, |
| 192 | + #[zbus(object_server)] server: &zbus::ObjectServer, |
| 193 | + ) -> zbus::fdo::Result<()> { |
| 194 | + tracing::debug!("Object {} closed", self.handle_path); |
| 195 | + server |
| 196 | + .remove::<Self, &zvariant::OwnedObjectPath>(&self.handle_path) |
| 197 | + .await?; |
| 198 | + |
| 199 | + if let Ok(mut guard) = self.sender.lock() { |
| 200 | + if let Some(sender) = (*guard).take() { |
| 201 | + // This will Err out if the receiver has been dropped. |
| 202 | + let _ = sender.send(()); |
| 203 | + } |
| 204 | + } |
| 205 | + |
| 206 | + Ok(()) |
| 207 | + } |
| 208 | +} |
| 209 | + |
| 210 | +impl Request { |
| 211 | + async fn serve( |
| 212 | + object_server: &zbus::ObjectServer, |
| 213 | + handle_path: OwnedObjectPath, |
| 214 | + sender: futures_channel::oneshot::Sender<()>, |
| 215 | + ) -> zbus::fdo::Result<()> { |
| 216 | + tracing::debug!("Handling object {:?}", handle_path.as_str()); |
| 217 | + |
| 218 | + let iface = Request { |
| 219 | + handle_path: handle_path.clone(), |
| 220 | + sender: Arc::new(Mutex::new(Some(sender))), |
| 221 | + }; |
| 222 | + |
| 223 | + object_server.at(handle_path, iface).await?; |
| 224 | + |
| 225 | + Ok(()) |
| 226 | + } |
| 227 | +} |
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