FreeBSD Architecture Handbook by FreeBSD Documentation Project PDF

By FreeBSD Documentation Project

An in-depth advisor of the FreeBSD working method structure.

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Addr in; ... aton(argv[3], &in); ... " The ip number node in the jail structure is set only when the ip address placed onto the in structure by inet aton is translated into network byte order by ntohl(). 3 Jailing The Process Finally, the userland program jails the process, and executes the command specified. c i = jail(&j); ... i = execv(argv[4], argv + 4); As you can see, the jail function is being called, and its argument is the jail structure which has been filled with the arguments given to the program.

This label structure is maintained by the MAC Framework via label management entry points, and permits the Framework to offer a labeling service to policy modules through relatively non-invasive changes to the kernel subsystem maintaining the 35 Chapter 6 The TrustedBSD MAC Framework object. For example, label structures have been added to processes, process credentials, sockets, pipes, vnodes, Mbufs, network interfaces, IP reassembly queues, and a variety of other security-relevant structures.

Mpo_init_cred_label = mac_policy_init_label, /* ... mpo_check_vnode_write = mac_policy_check_vnode_write, 37 Chapter 6 The TrustedBSD MAC Framework }; The MAC policy entry point vector, mac_policy_ops in this example, associates functions defined in the module with specific entry points. A complete listing of available entry points and their prototypes may be found in the MAC entry point reference section. mpo_init entry points. mpo_init will be invoked once a policy is successfully registered with the module framework but prior to any other entry points becoming active.

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FreeBSD Architecture Handbook by FreeBSD Documentation Project


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