chore: Replace openSSL with native methods

NextcloudTalk/AppDelegate.m

@@ -24,7 +24,6 @@
 #import "NCNavigationController.h"
 #import "NCNotificationController.h"
 #import "NCPushNotification.h"
-#import "NCPushNotificationsUtils.h"
 #import "NCRoomsManager.h"
 #import "NCSettingsController.h"
 #import "NCUserInterfaceController.h"
@@ -344,16 +343,19 @@ - (void)application:(UIApplication *)application didReceiveRemoteNotification:(N
 {
     // Called when a background notification is delivered.
     NSString *message = [userInfo objectForKey:@"subject"];
+    NSString *signature = [userInfo objectForKey:@"signature"];
+
+    if (!message || !signature) {
+        return;
+    }
+
     for (TalkAccount *account in [[NCDatabaseManager sharedInstance] allAccounts]) {
-        NSData *pushNotificationPrivateKey = [[NCKeyChainController sharedInstance] pushNotificationPrivateKeyForAccountId:account.accountId];
-        if (message && pushNotificationPrivateKey) {
-            NSString *decryptedMessage = [NCPushNotificationsUtils decryptPushNotification:message withDevicePrivateKey:pushNotificationPrivateKey];
-            if (decryptedMessage) {
-                NCPushNotification *pushNotification = [NCPushNotification pushNotificationFromDecryptedString:decryptedMessage withAccountId:account.accountId];
-                [[NCNotificationController sharedInstance] processBackgroundPushNotification:pushNotification];
-
-                break;
-            }
+        NSString *decryptedMessage = [NCPushNotificationsUtils decryptPushNotificationWithMessageBase64:message withSignatureBase64:signature forAccount:account];
+        if (decryptedMessage) {
+            NCPushNotification *pushNotification = [NCPushNotification pushNotificationFromDecryptedString:decryptedMessage withAccountId:account.accountId];
+            [[NCNotificationController sharedInstance] processBackgroundPushNotification:pushNotification];
+
+            break;
         }
     }
 
@@ -382,25 +384,23 @@ - (void)pushRegistry:(PKPushRegistry *)registry didReceiveIncomingPushWithPayloa
     [NCUtils log:@"Received PushKit notification"];
 
     NSString *message = [payload.dictionaryPayload objectForKey:@"subject"];
-    for (TalkAccount *account in [[NCDatabaseManager sharedInstance] allAccounts]) {
-        NSData *pushNotificationPrivateKey = [[NCKeyChainController sharedInstance] pushNotificationPrivateKeyForAccountId:account.accountId];
+    NSString *signature = [payload.dictionaryPayload objectForKey:@"signature"];
 
-        if (!message || !pushNotificationPrivateKey) {
-            continue;
-        }
-
-        NSString *decryptedMessage = [NCPushNotificationsUtils decryptPushNotification:message withDevicePrivateKey:pushNotificationPrivateKey];
+    if (message && signature) {
+        for (TalkAccount *account in [[NCDatabaseManager sharedInstance] allAccounts]) {
+            NSString *decryptedMessage = [NCPushNotificationsUtils decryptPushNotificationWithMessageBase64:message withSignatureBase64:signature forAccount:account];
 
-        if (!decryptedMessage) {
-            continue;
-        }
+            if (!decryptedMessage) {
+                continue;
+            }
 
-        NCPushNotification *pushNotification = [NCPushNotification pushNotificationFromDecryptedString:decryptedMessage withAccountId:account.accountId];
+            NCPushNotification *pushNotification = [NCPushNotification pushNotificationFromDecryptedString:decryptedMessage withAccountId:account.accountId];
 
-        if ( pushNotification && pushNotification.type == NCPushNotificationTypeCall) {
-            [[NCNotificationController sharedInstance] showIncomingCallForPushNotification:pushNotification];
-            completion();
-            return;
+            if (pushNotification && pushNotification.type == NCPushNotificationTypeCall) {
+                [[NCNotificationController sharedInstance] showIncomingCallForPushNotification:pushNotification];
+                completion();
+                return;
+            }
         }
     }
 

NextcloudTalk/Database/TalkAccount.h

@@ -29,7 +29,7 @@ NS_ASSUME_NONNULL_BEGIN
 @property NSInteger lastPushSubscription;
 @property NSString *deviceIdentifier;
 @property NSString *deviceSignature;
-@property NSString *userPublicKey;
+@property NSString * _Nullable userPublicKey;
 @property NSInteger unreadBadgeNumber;
 @property BOOL unreadNotification;
 @property NSInteger lastContactSync;

NextcloudTalk/Notifications/NCPushNotificationKeyPair.swift

@@ -0,0 +1,16 @@
+//
+// SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+@objcMembers
+public class NCPushNotificationKeyPair: NSObject {
+
+    public var privateKey: Data
+    public var publicKey: Data
+
+    init(privateKey: Data, publicKey: Data) {
+        self.privateKey = privateKey
+        self.publicKey = publicKey
+    }
+}

NextcloudTalk/Notifications/NCPushNotificationsUtils.swift

@@ -0,0 +1,54 @@
+//
+// SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+import SwiftyRSA
+
+@objcMembers
+public class NCPushNotificationsUtils: NSObject {
+
+    public static func decryptPushNotification(withMessageBase64 messageBase64: String, withSignatureBase64 signatureBase64: String, forAccount account: TalkAccount) -> String? {
+        do {
+            guard let userPublicKeyPem = account.userPublicKey else { return nil }
+
+            let encryptedMessage = try EncryptedMessage(base64Encoded: messageBase64)
+            let userPublicKey = try RsaPublicKey(pemEncoded: userPublicKeyPem)
+            let signature = try Signature(base64Encoded: signatureBase64)
+
+            guard try encryptedMessage.verify(with: userPublicKey, signature: signature, digestType: .sha512) else {
+                return nil
+            }
+
+            guard let devicePrivateKeyData = NCKeyChainController.sharedInstance().pushNotificationPrivateKey(forAccountId: account.accountId),
+                  let devicePrivateKeyPem = String(data: devicePrivateKeyData, encoding: .utf8) else {
+                return nil
+            }
+
+            let devicePrivateKey = try RsaPrivateKey(pemEncoded: devicePrivateKeyPem)
+            let clearMessage = try encryptedMessage.decrypted(with: devicePrivateKey, padding: .PKCS1)
+
+            return try clearMessage.string(encoding: .utf8)
+        } catch {
+            print("decryptPushNotificationError: \(error)")
+        }
+
+        return nil
+    }
+
+    public static func generatePushNotificationKeyPair() -> NCPushNotificationKeyPair? {
+        do {
+            let keyPair = try SwiftyRSA.generateRSAKeyPair(sizeInBits: 2048)
+
+            let privateKeyPem = try keyPair.privateKey.pemStringPkcs8()
+            let publicKeyPem = try keyPair.publicKey.pemStringPkcs8()
+
+            return NCPushNotificationKeyPair(privateKey: privateKeyPem.data(using: .utf8)!, publicKey: publicKeyPem.data(using: .utf8)!)
+        } catch {
+            NCUtils.log("Error generating push keypair: \(error)")
+        }
+
+        return nil
+    }
+
+}

NextcloudTalk/Security/CCCertificate.m

@@ -5,13 +5,10 @@
 
 #import "CCCertificate.h"
 
-#import <openssl/x509.h>
-#import <openssl/bio.h>
-#import <openssl/err.h>
-#import <openssl/pem.h>
-
 #import "NCAppBranding.h"
 
+#import "NextcloudTalk-Swift.h"
+
 @implementation CCCertificate
 
 NSString *const appCertificates = @"Library/Application Support/Certificates";
@@ -79,45 +76,23 @@ - (BOOL)checkTrustedChallenge:(NSURLAuthenticationChallenge *)challenge
 - (void)saveCertificate:(SecTrustRef)trust withName:(NSString *)certName
 {
     SecCertificateRef currentServerCert = SecTrustGetLeafCertificate(trust);
-
     CFDataRef data = SecCertificateCopyData(currentServerCert);
-    X509 *x509cert = NULL;
-    if (data) {
-        BIO *mem = BIO_new_mem_buf((void *)CFDataGetBytePtr(data), (int)CFDataGetLength(data));
-        x509cert = d2i_X509_bio(mem, NULL);
-        BIO_free(mem);
-        CFRelease(data);
-
-        if (!x509cert) {
-
-            NSLog(@"[LOG] OpenSSL couldn't parse X509 Certificate");
-
-        } else {
-
-            NSString *localCertificatesFolder = [self getDirectoryCerificates];
-
-            certName = [NSString stringWithFormat:@"%@/%@",localCertificatesFolder,certName];
-
-            if ([[NSFileManager defaultManager] fileExistsAtPath:certName]) {
-                NSError *error;
-                [[NSFileManager defaultManager] removeItemAtPath:certName error:&error];
-            }
-
-            FILE *file;
-            file = fopen([certName UTF8String], "w");
-            if (file) {
-                PEM_write_X509(file, x509cert);
-            }
-            fclose(file);
-        }
-
-    } else {
-
-        NSLog(@"[LOG] Failed to retrieve DER data from Certificate Ref");
+
+    if (!data) {
+        return;
     }
-
-    //Free
-    X509_free(x509cert);
+
+    NSData *nsData = (__bridge NSData *)(data);
+    NSString *base64Certificate = [nsData base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength | NSDataBase64EncodingEndLineWithLineFeed];
+
+    if (!base64Certificate) {
+        return;
+    }
+
+    NSString *localCertificatesFolder = [self getDirectoryCerificates];
+    certName = [NSString stringWithFormat:@"%@/%@", localCertificatesFolder, certName];
+
+    [base64Certificate writeToFile:certName atomically:YES encoding:NSUTF8StringEncoding error:nil];
 }
 
 - (void)presentViewControllerCertificateWithTitle:(NSString *)title viewController:(UIViewController *)viewController delegate:(id)delegate

NextcloudTalk/Settings/NCKeyChainController.h

@@ -20,9 +20,9 @@ extern NSString * const kNCPushKitTokenKey;
 - (void)setToken:(NSString *)token forAccountId:(NSString *)accountId;
 - (NSString *)tokenForAccountId:(NSString *)accountId;
 - (void)setPushNotificationPublicKey:(NSData *)privateKey forAccountId:(NSString *)accountId;
-- (NSData *)pushNotificationPublicKeyForAccountId:(NSString *)accountId;
+- (NSData * _Nullable)pushNotificationPublicKeyForAccountId:(NSString *)accountId;
 - (void)setPushNotificationPrivateKey:(NSData *)privateKey forAccountId:(NSString *)accountId;
-- (NSData *)pushNotificationPrivateKeyForAccountId:(NSString *)accountId;
+- (NSData * _Nullable)pushNotificationPrivateKeyForAccountId:(NSString *)accountId;
 - (NSString *)pushTokenSHA512;
 - (void)logCombinedPushToken;
 - (NSString *)combinedPushToken;

NextcloudTalk/Settings/NCSettingsController.h

@@ -66,7 +66,6 @@ typedef NS_ENUM(NSInteger, NCPreferredFileSorting) {
 - (void)connectDisconnectedExternalSignalingControllers;
 - (void)disconnectAllExternalSignalingControllers;
 - (void)subscribeForPushNotificationsForAccountId:(NSString *)accountId withCompletionBlock:(SubscribeForPushNotificationsCompletionBlock)block;
-- (NSInteger)chatMaxLengthConfigCapability;
 - (BOOL)canCreateGroupAndPublicRooms;
 - (BOOL)isGuestsAppEnabled;
 - (BOOL)isReferenceApiSupported;