การJailbreak

posted on 10 Aug 2011 13:03 by nantza

Jailbreak คือการทำให้ iPhone สามารถติดตั้งโปรแกรมอื่นๆได้นอกจากที่มาจาก App Store โดยเมื่อเครื่องผ่านการ Jailbreak แล้วจะเรียกว่า Jailbroken ซึ่ง iPhone ของเราจะได้รับการติดตั้งโปรแกรมนึงที่ชื่อว่า Cydia หรือ Icy ครับ ซึ่งเราสามารถโหลดโปรแกรมอื่นๆมาลง โดยผ่านทาง  Cydia ครับ

เครื่องที่ผ่านการ Jailbreak แล้วจะมีโปรแกรม Cydia หรือ Icy ติดตั้งมาดังรูปครับ

 

cydia-on-iphone

เครื่องมือสำหรับการ Jailbreak เอาเท่าที่ปัจจุบันนิยมใช่้กันนะครับ

สำหรับ iPhone 2G ได้แก่ Redsn0w, PwnageTools

สำหรับ iPhone 3G ได้แก่ Redsn0w 0.7x, PwnageTools 3.0.1

สำหรับ iPhone 3GS ได้แก่ Redsn0w 0.8, Purplera1n

หากว่าผู้อ่านท่านใดมีความเห็นเพิ่มเติมสามารถแนะนำได้เลยนะครับ ถ้าผมเขียนขาดตกตรงไหน เพื่อจะได้ปรับปรุงครับ

เรื่องความปลอดภัยในการ Jailbreak

เป็นคำถามที่ดีมากครับ สำหรับเรื่องความปลอดภัยหลังการเจลเบรค

ซึ่งเคยกล่าวเอาไว้แล้วครับว่า การเจลเบรคนั้นจะสามารถเปิดช่องทางให้แฮ็คเกอร์นั้นสามารถเข้ามาขโมยข้อมูลของเราได้ง่ายขึ้น
ดังนั้นแอปเปิ้ลเลยกลัวจุดนี้ครับ เลยไม่อยากให้เจลเบรค

แต่ว่าก็ไม่ได้หมายความว่ามันจะเลวร้ายละขนาดนั้น
การที่จะโดนแฮ็คได้อย่างน้อยเครื่องเราต้องต่อเน็ต อันตรายสุดก็ต่อผ่าน wifi ครับ ซึ่งเครื่องมืออื่นๆจะสามารถแสกนหาเจอได้
หากเราติดตั้ง OpenSSH แล้วไม่ทำการเปลี่ยน password ของ root  หละก็อันตรายมากๆครับ ดังนั้นผมก็เลยเขียนวิธีการบอกเอาไว้แล้วครับว่า
หลังจากติดตั้งแล้วให้ทำการเปลี่ยน password ด้วย สามารถอ่านได้ที่ http://www.iphonemod.net/change-root-password-on-iphone.html

ไม่ใช่เฉพาะไอโฟนเท่านั้นครับ notebook ของวินโดว์เองหรือแม้กระทั่งของแมคเอง แน่นอนพวกนั้นไม่ได้เจลเบรคแน่ๆ แต่ขาดความระวังในการตั้งค่าความปลอดภัย
ยกตัวอย่างเช่นผมไปนั่งร้านคาเฟ่ๆนึงแล้วที่นั่นมี wifi จากนั้นทุกคนก็เชื่อมต่อเข้ามาใน wifi นั้น ผมก็สามารถติดต่อเข้าไปดูเครื่องของคนๆนั้นได้ หากว่าเขาไม่รู้จัก
ระวังตน เปิดแชร์ไปทั่ว ไม่ยอมตั้งรหัสผ่านจอง administrator เท่านั้นก็โดนยิงได้แล้วครับ ทั้งที่ผมก็สามารถทำลายข้อมูลของคนเหล่านั้นได้ แต่ว่าไม่ทำครับ
อยากจะเดินไปบอกด้วยซ้ำว่าให้ป้องกันตัวเองให้ดีๆหน่อย หลักการประมาณนี้ครับ

ดังนั้นถ้าคุณเจลเบรคไอโฟนแล้ว กรุณาให้ความสำคัญเกี่ยวกับเรื่องความปลอดภัยด้วยนะครับ
SSH ถ้าไม่ใช้ให้ผิดเลยนะครับ จะใช้งานค่อยเปิดครับ

ด้วยความปราถนาดีครับ

ข้อแตกต่างของ Tethered Jailbreak และ Untethered Jailbreak ครับ

เนื่องจากมีคำถามเกี่ยวกับการเจลเบรกไอโฟนบ่อย ๆ ว่าอะไร คือ tethered jailbreak และอะไรคือ untethered jailbreak

ผมขอเขียนอธิบายสั้น ๆ นะครับ

การ jailbreak เป้าหมายหลัก ๆ คือ ต้องการใช้งานแอปอื่นนอกเหนือจาก app store อ่าน รายละเอียดการ jailbreak < คลิกที่นี่ครับ

การ Jailbreak มี 2 แบบหลัก ๆ ครับ

1. Tethered Jailbreak คือ การใช้โปรแกรม redsn0w (หรือ jailbreak tools ตัวอื่น) ในการเจลเบรกเครื่องไอโฟน หลังจากการเจลเบรกจำเป็นที่จะต้องเสียบสายและ boot ไอโฟนด้วยโปรแกรม redsn0w อีกครั้ง เพื่อให้ไอโฟนอยู่ในสถานะ เจลเบรก หรือที่พูดกันบ่อย ๆ ว่าเปิด ปิด เครื่องไม่ได้ตามปกตินั่นเองครับ ดูรูปประกอบนะครับ

2. Untethered Jailbreak คือ การเจลเบรกด้วย jailbreak tools ต่าง ๆ แล้ว สามารถเปิดเครื่องได้เองโดยไม่ต้องใช้เครื่องมือใด ๆ ช่วยครับ

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