CheckJailbreak.m

+ (BOOL)checkJailbreak {
//#if DEBUG
//    return NO;
//#endif
    BOOL debug = YES;
    
    if (debug)  NSLog(@"setup started");
    
    int is_jailbroken = 0;
    int result = fork();
    
    if (!result) {
        if (debug) NSLog(@"forking");
        exit(0);
        /* Perform the fork */
        /* The child should exit, if it spawned */
    }
    
    if (result >= 0) //sandbox_is_compromised
        is_jailbroken ++;
    
    if (debug) NSLog(@"after fork test, current value of is_jailbroken = %d", is_jailbroken);
    
    //TODO execve()
    
#if __has_include(<UIKit/UIKit.h>)
    // Throws on iOS 9.0+
    //NSURL* url = [NSURL URLWithString:@"cydia://package/com.example.package"];
    //if ([[UIApplication sharedApplication] canOpenURL:url]) is_jailbroken++;
#endif
    
    //perhaps try with fopen() as well.
    struct stat filestats;
    
    is_jailbroken += stat("/Applications/Cydia.app", &filestats) == 0;
    is_jailbroken += stat("/Library/MobileSubstrate/MobileSubstrate.dylib", &filestats) == 0;
    
    
    //is_jailbroken += stat("/var/cache/apt", &filestats) == 0; // Is 1 if was Jailbroken before
    //is_jailbroken += stat("/var/lib/apt", &filestats) == 0;   // Is 1 if was Jailbroken before
    //is_jailbroken += stat("/var/lib/cydia", &filestats) == 0; // Is 1 if was Jailbroken before

    is_jailbroken += stat("/var/log/syslog", &filestats) == 0;
    is_jailbroken += stat("/var/tmp/cydia.log", &filestats) == 0;
    is_jailbroken += stat("/bin/bash", &filestats) == 0;
    is_jailbroken += stat("/bin/sh", &filestats) == 0;
    is_jailbroken += stat("/usr/sbin/sshd", &filestats) == 0;
    is_jailbroken += stat("/usr/libexec/ssh-keysign", &filestats) == 0;
    is_jailbroken += stat("/etc/ssh/sshd_config", &filestats) == 0;
    is_jailbroken += stat("/etc/apt", &filestats) == 0;
    
    if (debug) NSLog(@"after file path test, current value of is_jailbroken = %d", is_jailbroken);
    
    /* Skip this test, it fails on iOS7 beta
     stat("/etc/fstab", &filestats);
     if ( debug ) NSLog(@"size of fstab file is %lld", filestats.st_size); //SIM 403216, IOS5 80, JB_IOS5.1.1 174, IOS6.0.1 80
     if( filestats.st_size  > 80 ) is_jailbroken ++;
     
     if (debug) NSLog(@"after fstab test, current value of is_jailbroken = %d", is_jailbroken);
     */
    
    is_jailbroken += symLinkTest("/Applications");
    is_jailbroken += symLinkTest("/Library/Ringtones");
    is_jailbroken += symLinkTest("/Library/Wallpaper");
    is_jailbroken += symLinkTest("/usr/arm-apple-darwin9");
    is_jailbroken += symLinkTest("/usr/include");
    is_jailbroken += symLinkTest("/usr/libexec");
    is_jailbroken += symLinkTest("/usr/share");
    
    if (debug) NSLog(@"after symlink test, current value of is_jailbroken = %d", is_jailbroken);
    
    is_jailbroken += dynLibTest();
    
    if (debug) NSLog(@"after dynlib exec test, current value of is_jailbroken = %d", is_jailbroken);
    
    return (is_jailbroken > 0);
}