May 2001
Intermediate to advanced
618 pages
20h 50m
English
Content preview from Java Security, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Comparison with Previous Releases
The
default sandbox is
essentially unchanged between 1.2 and 1.3.
In 1.2, there is no prohibition against defining classes in the
java package.
In Java 1.1, the default sandbox is very different. The 1.1 sandbox
is determined solely by the security manager installed by the Java
program; although it is possible to write a security manager that
allows end users and administrators to configure different security
policies, few programs followed that course. For most Java
applications, this meant that no security manager was ever installed,
and the program ran with complete permissions. Java applets run
through the appletviewer and early, 1.1-based versions of the Java
Plug-in are subject to strict, nonconfigurable restrictions. Using
the signing tool of 1.1 (javakey), it is
possible to sign Java applets; these applets can then be given
permission to perform any operation. However, the 1.1-based signing
infrastructure has been deprecated, and an applet signed with
javakey will not be given any special
permissions in Java 2.
If you need to understand the 1.1 default sandbox, see Chapter 4 for a discussion of the security manager. Appendix D, shows how you can build a 1.1 application to run other Java applications with a security policy that you’ve written yourself.
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.