ebookpoy.blogg.se

1. #WINDOWS AFD SOCKET BUFFER SIZE MISSING DRIVER#
2. #WINDOWS AFD SOCKET BUFFER SIZE MISSING CODE#
3. #WINDOWS AFD SOCKET BUFFER SIZE MISSING WINDOWS#

#WINDOWS AFD SOCKET BUFFER SIZE MISSING DRIVER#

Instead, more general APIs are implemented, called Transport Driver Interface (TDI).

#WINDOWS AFD SOCKET BUFFER SIZE MISSING WINDOWS#

( security/selinux/ss/sidtab.For the development of large-scale responsive Winsock applications, a basic understanding of the socket architecture of Windows NT and Windows 2000 is very helpful.ĭifferent from other operating systems, the transport protocol layer of WinNT and Win2000 does not directly provide socket-style interfaces to applications and does not accept direct access from applications. Spending time comparing them during lookups, they are reduced to an identifier via a table. Rather than keeping track of complex objects and SIDs turn out to be much like interned symbols in some languages. So now we have to discover what the AVC is actually caching, and where these SIDs are coming from. Referring back to the table concept: in order to check if a process with SID x may call getpgid weįind x across and x down and check that SECCLASS_PROCESS: PROCESS_GETPID is in the set of allowed Return avc_has_perm( sid, tsid, SECCLASS_PROCESS, perms, NULL) Static int current_has_perm( const struct task_struct *tsk, Return current_has_perm(p, PROCESS_GETPGID) ( security/selinux/hooks.c): static int selinux_task_getpgid( struct task_struct *p) When SELinux is built into a kernel, this ends up calling the following hook function Consider the getpgid system call to get the current SELinux hooks into the kernel using the LSM hooks and is called whenever the kernel isĪbout to perform an action which needs a security check. The AVC is queried when the kernel needs to make security decisions. U32 ssid // subject SID u32 tsid // object SID u16 tclass // class struct av_decision avd // contains the set of permissions for that class The AVC is a hash map from (subject, object, class) to the bitset of permissions

#WINDOWS AFD SOCKET BUFFER SIZE MISSING CODE#

This is reflected in the first part of the SELinux code that we'll look at : the access vector cache Objects across the top and, in each cell, the set of actions which that subject can perform on that object. The security policy of a system can be thought of as a table, with subjects running down the left edge, For the FILE class, some examples of permissions are READ, WRITE, LOCK etc.Īt the time of writing there are 73 different classes ( selinux/libselinux/include/selinux/flask.h) andġ025 different permissions (. Examples of classes are FILE, TCP_SOCKET and Each class can have up to 32 permissions (because they are stored as aīitmask in a 32-bit int). The action boils down to a class and a permission. SELinux is fundamentally about answering questions of the form “May x doĪlthough the nature of the subject and object can beĬomplex, they all boil down to security identifiers (SIDs), which are unsigned 32-bit integers.

This document is a guide to the internals of SELinux by starting at the kernel source and working Preferred to understand a system from the bottom-up and, in this regard, found the information somewhat There are some great sources of information for users and sysadmins about SELinux