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For a computer to be secure it must be physically secure. If we can get our hands on a host then we are never more than a screwdriver away from all of its assets. Disks can be removed. Sophisticated users can tap network lines and listen to traffic. The radiation from monitor screens can be captured and recorded, showing an exact image of what a user is looking at on his/her screen. Or one can simply look over the shoulder of a colleague while he or she types a password. The level of physical security one requires depends upon the sophistication of the potential intruder, and therefore in the value of the assets which one is protecting. Assuming that hosts are physically secure, we then still have to deal with the issues of software security, which is a much more difficult topic. Software security is about access control and software reliability. No single tool can make computer systems secure. Major blunders have been made out of the belief that a single product (e.g. a 'firewall') would solve the security problem. The bottom line is that there is no such thing as a secure operating system, firewall or no firewall. What is required is a persistent mixture of vigilance and adaptability.

color white/blue black/light-gray default 0 timeout 8 gfxmenu (hd0,2)/boot/message title Linux kernel (hd0,2)/boot/vmlinuz root=/dev/hda3 initrd (hd0,2)/boot/initrd title Windows root (hd0,1) makeactive chainloader +1

6. If s < m, go to step 7, otherwise set At = At/2 and wk = (wk + w k-i )/2, vk = (vk + v k - 1 )/4, s - 0 and go to 7.

Table 4-4 takes the default Linux entry in menu.lst and breaks it down so that you can create your own GRUB entry if needed.

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For many, security is perceived as being synonymous with network privacy or network intrusion. Privacy is one aspect of security, but the network is not our particular enemy. Many breaches of security happen from within. In reality, there is little difference between the dangers of remote access by network or direct access from a console: privacy is about access control, no matter where a hostile user might be. If we focus exclusively on network connectivity we ignore a possible threat from internal employees (e.g. the janitor who is a computer expert and has an axe to grind, or the mischievous son of the director who was left waiting to play in mom's office, or perhaps the unthinkable: a disgruntled employee who feels as though his/her talents go unappreciated). Software security is a vast subject, because modern computer systems are complex. It is only exacerbated by the connectivity of the Internet which allows millions of people to have a go at breaking into networked systems. What this points to is the fact that a secure environment requires a tight control of access control on every host individually, not merely at specific points such as firewalls. If we stretch our powers of abstraction even to include loss by natural disaster, then system security can be summarized by a basic principle: Principle 43 (Security) The fundamental requirement for security is the ability to restrict access and privilege to data. The word privilege does not apply well to loss by accident or natural disaster, but the word access does. If accidental actions or natural disasters do not have access to data, they they cannot cause them any harm. Any attempt to run a secure system where restriction of access is not possible is fundamentally flawed.

Parameter Description Because Windows has its loader in the MBR of the partition it was installed into, its boot loader needs to be loaded. The +1 signifies that GRUB should start loading the boot loader from the first sector in the partition. Identifies the default profile that is used if no user interaction takes place. As with other things in GRUB, the entries start from 0, so the default used in the previous example is the Linux profile. Specifies the location of the graphical file used as a background against which to display the GRUB menus. The initial ramdisk that is used for this kernel. The location of the kernel. The hd(0,2) signifies hard drive 0 (the first hard drive), partition 3 (partition numbers in GRUB start at 0). If you look in the /boot directory, you will see the vmlinuz kernel file. When you are booting Windows, it installs a boot loader into the MBR of the partition that it is installed into. To actually load this MBR, GRUB has to temporarily make the partition active for booting. This clause makes sure this happens when the Windows profile is selected. For a Linux boot profile, specifies the partition that the kernel will attempt to mount as its root filesystem. This is the partition that is to be mounted at / (root) that we have talked about previously in this chapter. For nonLinux boot profiles, specifies the hard drive and partition that holds the alternate bootable operating system. The number of seconds that GRUB waits before automatically booting the default profile. This is how the entry looks in the GRUB menu that is shown to the user at boot up.

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