Keychain dumper (Obj-C). Prints all values from iOS Keychain.

KeychainDumper.m

@interface KeychainDumper: NSObject
- (void)dumpVerbose:(BOOL)verbose;
@end

@implementation KeychainDumper

- (void)dumpVerbose:(BOOL)verbose {
    [self printString:@"##################################################################"];
    [self printString:@"### KEYCHAIN DUMP ################################################"];
    [self printString:@"##################################################################"];
    NSMutableDictionary *query = [NSMutableDictionary new];
    query[(__bridge id)kSecReturnAttributes] = (__bridge id)kCFBooleanTrue;
    query[(__bridge id)kSecMatchLimit] = (__bridge id)kSecMatchLimitAll;
    
    NSArray *allSecItemClasses = [NSArray arrayWithObjects:
                                  (__bridge id)kSecClassGenericPassword,
                                  (__bridge id)kSecClassInternetPassword,
                                  (__bridge id)kSecClassCertificate,
                                  (__bridge id)kSecClassKey,
                                  (__bridge id)kSecClassIdentity,
                                  nil];
    
    for (id secItemClass in allSecItemClasses) {
        [self printString:@"### Item class: %@", secItemClass];
        [query setObject:secItemClass forKey:(__bridge id)kSecClass];
        
        CFTypeRef result = NULL;
        OSStatus status = SecItemCopyMatching((__bridge CFDictionaryRef)query, &result);
        
        if (status == errSecItemNotFound) {
            [self printString:@" No items for the class."];
            continue;
        }
        if (status != errSecSuccess) {
            [self printString:@" Failed to read from keychain"];
            continue;
        }
        
        if (result == NULL) {
            [self printString:@" No data the class"];
            continue;
        }
        
        NSArray *resultsArray = (__bridge NSArray *)result;
        
        for (NSDictionary *itemDictionary in resultsArray) {
            [self dumpData:itemDictionary verbose:verbose];
        }
        
        if (result != NULL) {
            CFRelease(result);
        }
    }
    
    [self printString:@"##################################################################"];
}

- (void)dumpData:(NSDictionary *)data verbose:(BOOL)verbose {
    if (verbose) {
        [self printString:[data description]];
        return;
    }
    
    NSString *key = data[@"svce"];
    if (key.length > 0) {
        NSString *value = [self readKeychainValueForKey:key];
        [self printString:@" %@: '%@'", key, value];
    } else {
        [self printString:@" <no non-verbose description, value with %ld keys in dictionary>", (unsigned long)data.count];
    }
}

- (void)printString:(NSString *)format, ... {
    va_list args;
    va_start(args, format);
    NSString *string = [[NSString alloc] initWithFormat:format arguments:args];
    va_end(args);
    printf("%s\n", [string UTF8String]);
}

- (nullable NSString *)readKeychainValueForKey:(NSString *)key {
    NSParameterAssert(key);
    
    NSMutableDictionary *query = [NSMutableDictionary new];
    query[(__bridge id)kSecClass] = (__bridge id)kSecClassGenericPassword;
    query[(__bridge id)kSecReturnData] = @YES;
    query[(__bridge id)kSecAttrService] = key;
    
    CFTypeRef result = NULL;
    OSStatus status = SecItemCopyMatching((__bridge CFDictionaryRef)query, &result);
    
    if (status == errSecItemNotFound) {
        return nil;
    }
    
    if (status != errSecSuccess) {
        NSLog(@"Failed reading value for key: '%@'", key);
        return nil;
    }
    
    NSData *resultData = (__bridge_transfer NSData *)result;
    return [[NSString alloc] initWithData:resultData encoding:NSUTF8StringEncoding];
}

@end