Download Hardening Linux (Volume 0) by James Turnbull PDF

By James Turnbull

After studying this booklet, i feel it will likely be the required better half I hand out to new Linux directors, in addition to crucial method management. the 1st 6 chapters are remarkable. i will not say adequate good stuff approximately them. The insurance of PAM is best than something i've got visible. The insurance of authentication, teams, clients and top practices surrounding them used to be first-class in addition. The logging bankruptcy on my own is maybe definitely worth the buy of the ebook.

After the 1st part, the booklet covers extra particular issues which are of much less curiosity to me. I detect lot of individuals use e mail, of all types. bankruptcy 7, eight and nine conceal electronic mail, and that i simply wasn't that fascinated about it.

Chapter 10 coated securing FTP, that is great, and eleven covers Bind. i suppose i'm wondering why a few of the issues have been selected. there are complete books on electronic mail and bind, to be had, yet there's not regularly strong fabric for another providers, like CUPS, might be a few web-based management instruments, or SELinux. The insurance of subject matters that made the desk of contents are excellent.

I could say while you're new to Linux safety, or a professional participant trying to find simply one other reference, this ebook is excellent.

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Additional resources for Hardening Linux (Volume 0)

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O noshell Now you can use /sbin/noshell as the shell for those users for which you do not want a shell login. daemon:x:2:2:daemon:/sbin:/sbin/noshell When a user with their shell set to noshell attempts a log into the system, the following log entry will be generated to the auth facility with a log level of warning, and you can monitor for this. Jul 25 14:51:47 puppy -noshell[20081]: Titan warning: user bob login from a ➥ disabled shell ■Caution Just remember to ensure the noshell binary is not added to your /etc/shells file.

This allows you, for example, to create an additional menu of other kernels or boot options available only to those users who provide the required password. Like LILO, Grub allows you to protect a specific boot entry. It offers two ways of protecting a particular entry. If you specify the option lock directly after the title entry, then you will not be able to run that boot entry without entering a password previously specified by the password option. 7) kernel image. You can also use the password option within a boot entry to allow you to specify a particular password for each boot entry; Listing 1-4 shows you how to do it.

The useradd -D Defaults Option Description -b path/to/default/home Specifies the initial path prefix of a new user’s home directory -e date Specifies the default expiry date -f days Specifies the number of days after a password has expired before the account will be disabled -g group Specifies the default group -s shell Specifies the default shell As I have shown in Table 1-2 another option in the /etc/defaults/useradd file, the SKEL option, specifies a location under which you can create the required default directory and file structure for all of your users.

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