interop/clients/corecrypto/
ios.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
// Wire
// Copyright (C) 2025 Wire Swiss GmbH

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program. If not, see http://www.gnu.org/licenses/.

use crate::{
    CIPHERSUITE_IN_USE,
    clients::{EmulatedClient, EmulatedClientProtocol, EmulatedClientType, EmulatedMlsClient},
};
use base64::{Engine as _, engine::general_purpose};
use color_eyre::eyre::Result;
use core_crypto::prelude::{KeyPackage, KeyPackageIn};
use std::cell::{Cell, RefCell};
use std::fs;
use std::io::{BufRead, BufReader};
use std::process::{Child, ChildStdout, Command, Stdio};
use thiserror::Error;
use tls_codec::Deserialize;

#[derive(Debug)]
struct SimulatorDriver {
    device: String,
    process: Child,
    output: RefCell<BufReader<ChildStdout>>,
}

#[derive(Debug, serde::Deserialize)]
enum InteropResult {
    #[serde(rename = "success")]
    Success { value: String },
    #[serde(rename = "failure")]
    Failure { message: String },
}

#[derive(Error, Debug)]
#[error("simulator driver error: {msg}")]
struct SimulatorDriverError {
    msg: String,
}

impl SimulatorDriver {
    fn new(device: String, application: String) -> Self {
        log::info!("launching application: {}", application);

        let mut process = Command::new("xcrun")
            .args([
                "simctl",
                "launch",
                "--console-pty",
                "--terminate-running-process",
                &device,
                &application,
            ])
            .stdout(Stdio::piped())
            .stderr(Stdio::piped())
            .spawn()
            .expect("Failed to launch application");

        let mut output = BufReader::new(
            process
                .stdout
                .take()
                .expect("Expected stdout to be available on child process"),
        );
        let mut line = String::new();

        // Waiting for confirmation that the application has launched.
        while !line.contains("Ready") {
            line.clear();
            output
                .read_line(&mut line)
                .expect("was expecting ready signal on stdout");
        }

        log::info!("application launched: {}", line);

        Self {
            device,
            process,
            output: RefCell::new(output),
        }
    }

    async fn execute(&self, action: String) -> Result<String> {
        log::info!("interop://{}", action);

        Command::new("xcrun")
            .args([
                "simctl",
                "openurl",
                &self.device,
                format!("interop://{}", action).as_str(),
            ])
            .output()
            .expect("Failed to execute action");

        let mut result = String::new();
        let mut output = self.output.try_borrow_mut()?;

        output.read_line(&mut result)?;

        log::info!("{}", result);

        let result: InteropResult = serde_json::from_str(result.trim())?;

        match result {
            InteropResult::Success { value } => Ok(value),
            InteropResult::Failure { message } => Err(SimulatorDriverError { msg: message }.into()),
        }
    }
}

impl Drop for SimulatorDriver {
    fn drop(&mut self) {
        self.process.kill().expect("expected child process to be killed")
    }
}

#[derive(Debug)]
pub(crate) struct CoreCryptoIosClient {
    driver: SimulatorDriver,
    client_id: Vec<u8>,
    #[cfg(feature = "proteus")]
    prekey_last_id: Cell<u16>,
}

impl CoreCryptoIosClient {
    pub(crate) async fn new() -> Result<Self> {
        let client_id = uuid::Uuid::new_v4();
        let client_id_str = client_id.as_hyphenated().to_string();
        let client_id_base64 = general_purpose::STANDARD.encode(client_id_str.as_str());
        let ciphersuite = CIPHERSUITE_IN_USE as u16;
        let device = std::env::var("INTEROP_SIMULATOR_DEVICE").unwrap_or("booted".into());

        let driver = SimulatorDriver::new(device, "com.wire.InteropClient".into());
        log::info!("initialising core crypto with ciphersuite {}", ciphersuite);
        driver
            .execute(format!(
                "init-mls?client={}&ciphersuite={}",
                client_id_base64, ciphersuite
            ))
            .await?;

        Ok(Self {
            driver,
            client_id: client_id.into_bytes().into(),
            #[cfg(feature = "proteus")]
            prekey_last_id: Cell::new(0),
        })
    }
}

#[async_trait::async_trait(?Send)]
impl EmulatedClient for CoreCryptoIosClient {
    fn client_name(&self) -> &str {
        "CoreCrypto::ios"
    }

    fn client_type(&self) -> EmulatedClientType {
        EmulatedClientType::AppleiOS
    }

    fn client_id(&self) -> &[u8] {
        self.client_id.as_slice()
    }

    fn client_protocol(&self) -> EmulatedClientProtocol {
        EmulatedClientProtocol::MLS | EmulatedClientProtocol::PROTEUS
    }

    async fn wipe(mut self) -> Result<()> {
        Ok(())
    }
}

#[async_trait::async_trait(?Send)]
impl EmulatedMlsClient for CoreCryptoIosClient {
    async fn get_keypackage(&self) -> Result<Vec<u8>> {
        let ciphersuite = CIPHERSUITE_IN_USE as u16;
        let start = std::time::Instant::now();
        let kp_base64 = self
            .driver
            .execute(format!("get-key-package?ciphersuite={}", ciphersuite))
            .await?;
        let kp_raw = general_purpose::STANDARD.decode(kp_base64)?;
        let kp: KeyPackage = KeyPackageIn::tls_deserialize(&mut kp_raw.as_slice())?.into();

        log::info!(
            "KP Init Key [took {}ms]: Client {} [{}] - {}",
            start.elapsed().as_millis(),
            self.client_name(),
            hex::encode(&self.client_id),
            hex::encode(kp.hpke_init_key()),
        );

        Ok(kp_raw)
    }

    async fn add_client(&self, conversation_id: &[u8], kp: &[u8]) -> Result<()> {
        let cid_base64 = general_purpose::STANDARD.encode(conversation_id);
        let kp_base64 = general_purpose::STANDARD.encode(kp);
        let ciphersuite = CIPHERSUITE_IN_USE as u16;
        self.driver
            .execute(format!(
                "add-client?cid={}&ciphersuite={}&kp={}",
                cid_base64, ciphersuite, kp_base64
            ))
            .await?;

        Ok(())
    }

    async fn kick_client(&self, conversation_id: &[u8], client_id: &[u8]) -> Result<()> {
        let cid_base64 = general_purpose::STANDARD.encode(conversation_id);
        let client_id_base64 = general_purpose::STANDARD.encode(client_id);
        self.driver
            .execute(format!("remove-client?cid={}&client={}", cid_base64, client_id_base64))
            .await?;

        Ok(())
    }

    async fn process_welcome(&self, welcome: &[u8]) -> Result<Vec<u8>> {
        let welcome_path = std::env::temp_dir().join(format!("welcome-{}", uuid::Uuid::new_v4().as_hyphenated()));
        fs::write(&welcome_path, welcome)?;
        let conversation_id_base64 = self
            .driver
            .execute(format!(
                "process-welcome?welcome_path={}",
                welcome_path.to_str().unwrap()
            ))
            .await?;
        let conversation_id = general_purpose::STANDARD.decode(conversation_id_base64)?;

        Ok(conversation_id)
    }

    async fn encrypt_message(&self, conversation_id: &[u8], message: &[u8]) -> Result<Vec<u8>> {
        let cid_base64 = general_purpose::STANDARD.encode(conversation_id);
        let message_base64 = general_purpose::STANDARD.encode(message);
        let encrypted_message_base64 = self
            .driver
            .execute(format!("encrypt-message?cid={}&message={}", cid_base64, message_base64))
            .await?;
        let encrypted_message = general_purpose::STANDARD.decode(encrypted_message_base64)?;

        Ok(encrypted_message)
    }

    async fn decrypt_message(&self, conversation_id: &[u8], message: &[u8]) -> Result<Option<Vec<u8>>> {
        let cid_base64 = general_purpose::STANDARD.encode(conversation_id);
        let message_base64 = general_purpose::STANDARD.encode(message);
        let result = self
            .driver
            .execute(format!("decrypt-message?cid={}&message={}", cid_base64, message_base64))
            .await?;

        if result == "decrypted protocol message" {
            Ok(None)
        } else {
            let decrypted_message = general_purpose::STANDARD.decode(result)?;
            Ok(Some(decrypted_message))
        }
    }
}

#[cfg(feature = "proteus")]
#[async_trait::async_trait(?Send)]
impl crate::clients::EmulatedProteusClient for CoreCryptoIosClient {
    async fn init(&mut self) -> Result<()> {
        self.driver.execute("init-proteus".into()).await?;
        Ok(())
    }

    async fn get_prekey(&self) -> Result<Vec<u8>> {
        let prekey_last_id = self.prekey_last_id.get() + 1;
        self.prekey_last_id.replace(prekey_last_id);

        let prekey_base64 = self.driver.execute(format!("get-prekey?id={}", prekey_last_id)).await?;
        let prekey = general_purpose::STANDARD.decode(prekey_base64)?;

        Ok(prekey)
    }

    async fn session_from_prekey(&self, session_id: &str, prekey: &[u8]) -> Result<()> {
        let prekey_base64 = general_purpose::STANDARD.encode(prekey);
        self.driver
            .execute(format!(
                "session-from-prekey?session_id={}&prekey={}",
                session_id, prekey_base64
            ))
            .await?;

        Ok(())
    }

    async fn session_from_message(&self, session_id: &str, message: &[u8]) -> Result<Vec<u8>> {
        let message_base64 = general_purpose::STANDARD.encode(message);
        let decrypted_message_base64 = self
            .driver
            .execute(format!(
                "session-from-message?session_id={}&message={}",
                session_id, message_base64
            ))
            .await?;
        let decrypted_message = general_purpose::STANDARD.decode(decrypted_message_base64)?;

        Ok(decrypted_message)
    }
    async fn encrypt(&self, session_id: &str, plaintext: &[u8]) -> Result<Vec<u8>> {
        let plaintext_base64 = general_purpose::STANDARD.encode(plaintext);
        let encrypted_message_base64 = self
            .driver
            .execute(format!(
                "encrypt-proteus?session_id={}&message={}",
                session_id, plaintext_base64
            ))
            .await?;
        let encrypted_message = general_purpose::STANDARD.decode(encrypted_message_base64)?;

        Ok(encrypted_message)
    }

    async fn decrypt(&self, session_id: &str, ciphertext: &[u8]) -> Result<Vec<u8>> {
        let ciphertext_base64 = general_purpose::STANDARD.encode(ciphertext);
        let decrypted_message_base64 = self
            .driver
            .execute(format!(
                "decrypt-proteus?session_id={}&message={}",
                session_id, ciphertext_base64
            ))
            .await?;
        let decrypted_message = general_purpose::STANDARD.decode(decrypted_message_base64)?;

        Ok(decrypted_message)
    }

    async fn fingerprint(&self) -> Result<String> {
        let fingerprint = self.driver.execute("get-fingerprint".into()).await?;

        Ok(fingerprint)
    }
}