Tugriceri Web Notes

File Systems form Gentoo page

Gentoo Linux Documentation -- Preparing the Disks

Filesystems?The Linux kernel supports various filesystems. We'll explain ext2, ext3, ReiserFS, XFS and JFS as these are the most commonly used filesystems on Linux systems.

ext2 is the tried and true Linux filesystem but doesn’t have metadata journaling, which means that routine ext2 filesystem checks at startup time can be quite time-consuming. There is now quite a selection of newer-generation journaled filesystems that can be checked for consistency very quickly and are thus generally preferred over their non-journaled counterparts. Journaled filesystems prevent long delays when you boot your system and your filesystem happens to be in an inconsistent state.

Gentoo Telnet

emerge telnet-bsdPro-Linux Sicherheitsservice: Gentoo - telnet-bsd

The telnet-bsd telnet client is vulnerable to two buffer overflows, which could allow a malicious telnet server operator to execute arbitrary code.

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proc mounts etc mtab

live cd src# grub-install /dev/hda df: warning:cannot read table of mounted filesystems:no such file or directory df: warning:cannot read table of mounted filesystems:no such file or directory could not find device /boot: not found or not a block device chroot olduktan sonra;live cd src# grep -v rootfs /proc/mounts > /etc/mtab Komutu çalıştırılmalı.

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Proc dev mount and chroot

srv# mount -t proc none /mnt/gentoo/proc
srv# mount -o bind /dev /mnt/gentoo/dev
srv# chroot /mnt/gentoo /bin/bash
srv# env-update && source /etc/profile

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Authenticating E-Mail

http://www.ietf.org/rfc/rfc4406.txt

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iptables ile Port Knocking

$IPTABLES -A INPUT -p tcp --dport 22 -m recent --rcheck --seconds 60 --name SSH -j ACCEPT
$IPTABLES -A INPUT -p tcp --dport 21 -m recent --rcheck --seconds 60 --name SSH -j ACCEPT
$IPTABLES -A INPUT -p tcp --dport 1599 -m recent --name SSH --remove -j DROP
$IPTABLES -A INPUT -p tcp --dport 1600 -m recent --name SSH --set -j DROP
$IPTABLES -A INPUT -p tcp --dport 1601 -m recent --name SSH --remove -j DROP

RPM-PGP-KEY import

RPM-PGP-KEY import 

 rpm --import /usr/share/doc/rpm-4.4.2/RPM-PGP-KEY

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Mysql user priv.

mysql>GRANT ALL PRIVILEGES ON *.* TO 'monty'@'localhost'
->IDENTIFIED BY 'some_pass' WITH GRANT OPTION;

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