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SELinux by Example: Using Security Enhanced Linux by Frank Mayer

By Frank Mayer

SELinux: deliver World-Class safeguard to Any Linux atmosphere! SELinux bargains Linux/UNIX integrators, directors, and builders a cutting-edge platform for development and conserving hugely safe recommendations. Now that SELinux is integrated within the Linux 2.6 kernel--and introduced through default in Fedora middle, crimson Hat company Linux, and different significant distributions--it's more uncomplicated than ever to make the most of its advantages. SELinux via instance is the 1st entire, hands-on consultant to utilizing SELinux in creation environments. Authored via 3 best SELinux researchers and builders, it illuminates each side of operating with SELinux, from its structure and defense item version to its coverage language. The booklet completely explains SELinux pattern policies-- together with the strong new Reference Policy--showing find out how to quick adapt them for your distinctive surroundings. It additionally encompasses a entire SELinux coverage language reference and covers intriguing new positive factors in Fedora middle five and the impending purple Hat firm Linux model 5./ completely comprehend SELinux's entry keep an eye on and protection mechanisms / Use SELinux to build safe platforms from the floor up / achieve fine-grained keep watch over over kernel assets / Write coverage statements for sort enforcement, roles, clients, and constraints / Use not obligatory multilevel safety to implement info type and deal with clients with different clearances / Create conditional regulations that may be replaced on-the-fly / outline, deal with, and preserve SELinux protection guidelines / boost and write new SELinux defense coverage modules / Leverage rising SELinux applied sciences to realize even higher flexibility / successfully administer any SELinux procedure

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This is in many ways true, but it obscures the fact that not all "files" are the same. In reality, a modern UNIX-like system such as Linux has special files for devices, and IPC, in addition to standard files used for the storage of data. SELinux accurately represents this more detailed view of the kernel. Table 4-1 summarizes the file-related object classes. Table 4-1. File-Related Object Classes Object Class Description blk_file Block files chr_file Character files dir Directories fd File descriptors fifo_file Named pipes file Ordinary files filesystem Filesystem (for example, an actual partition) lnk_file Symbolic links sock_file UNIX domain sockets The object classes file and dir represent ordinary files and directories, respectively.

Chapter 4, "Object Classes and Permissions," discusses object classes and permissions in detail. 2. 72. The SELinux kernel architecture reflects the Flask architecture, which was designed for a microkernel environment. The Flask architecture has three primary components, as illustrated in Figure 3-2: security server, object managers, and the access vector cache. Figure 3-2. SELinux LSM module architecture [View full size image] The Flask design makes a strong distinction between security policy decision making and enforcement functions.

For example, the access vector statement for the object class representing file descriptors (fd) has a single classspecific permission allowing use of a file descriptor: class fd { use } Access Vector Statement Syntax The access vector statement associates permissions with a previously declared object class. The full syntax for the access vector statement is as follows: class class_name [ inherits common ] [{ perm_set } ] class_name A previously declared object class name. common A previously declared common permission set name.

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