hack proofing linux a Guide to Open Source Security phần 10 pps

... database. Determine if any unauthorized changes have been made to your database. Use the diff command to compare the two files to see if any changes have occurred.You may also use md5 to generate ... encrypted, many tools exist that help hackers wage a sniffing attack to capture encrypted information. ; After the packets containing the encrypted passwords are captured, hackers use c...

Ngày tải lên: 08/08/2014, 21:23

... to Open Source Security ™ 1 YEAR UPGRADE BUYER PROTECTION PLAN Linux: A Guide to Open Source Security The Only Way to Stop a Hacker Is to Think Like One James Stanger Patrick T. Lane 138 _linux_ FM ... One-way encryp- tion is also used to read a file and then create a hash of that file.The resulting hash value is said to be mathematically unrecoverable. You sh...

Ngày tải lên: 08/08/2014, 21:23

... supplied a username and password. If a user attempts to run the command via sudo and that user is not in the sudoers file, an e-mail is automatically sent to the administrator, indicating that an unauthorized ... filenames are now represented as variables. These variables are set automatically at runtime. ■ Undo feature Administrators can undo settings through various methods that are l...

Ngày tải lên: 08/08/2014, 21:23

... packets.This way, a fire- wall will not be able to capture and log the packets as easily. ■ -S Address Allows you to specify the originating address of the scan. Originally meant to allow Nmap to work ... uses SNMP, a protocol that allows you to monitor remote systems. Both Cheops and HP OpenView allow you to create a graphical map of the net- work, and then manage any host o...

Ngày tải lên: 08/08/2014, 21:23

... creates its database, it is said to enter database initialization mode. 5. You can then set Tripwire to rescan these files and compare their signa- tures to the signatures stored in the database.This ... generally extends your logging capability by placing additional information into a log file or into a database. Alerting An IDS often has the ability to send alert messages to...

Ngày tải lên: 08/08/2014, 21:23

... Snort’s analysis feature is able to read the contents of the captured packets and then inform you about any attacks waged against your network. ; Snort is able to automatically detect attacks based ... directories, and databases. ; An IDS can act as a supplement to a firewall, because it can help you monitor traffic on the internal network. Sometimes it may be useful to place an IDS...

Ngày tải lên: 08/08/2014, 21:23

... and /var/kerberos/krb5kdc/kdc.acl files to reflect your Kerberos realm and DNS domain names.You must then add an administrative user, as well as additional principals, to the database. Using kadmin.local Because ... a Kerberos administrator uses the kadmin pro- gram to add a principal to the database. Note that the ticket does not actually contain the password. It is only signed by...

Ngày tải lên: 08/08/2014, 21:23

... Red Hat Package Manager (RPM) packages are already installed (you may need to update them later in this section). To check if an RPM is installed, enter rpm -qa | grep rpm_name .To install an RPM, ... with S/WAN and VPNs in general. Currently, almost all firewalls and security software available today offers IPSec support. It is the goal of S/WAN developers for all S/WAN implementations...

Ngày tải lên: 08/08/2014, 21:23

... Ipchains and Iptables also allow you to configure your Linux router to masquerade traffic (i.e., to rewrite IP headers so that a packet appears to originate from a certain host), and/or to examine ... own dynamic database. If this database senses a number of ports that have been scanned in a row, the firewall can take action. Some actions the firewall can take may include auto...

Ngày tải lên: 08/08/2014, 21:23

... rules database One of the common moves by a hacker is to alter the rules database in subtle ways that make it easier for the hacker to gain access to the network. Check your rules and compare them ... who and last commands to learn about who has logged in to the fire- wall. In addition, manually check the /etc/passwd and /etc/shadow files to deter- mine if any users have been adde...

Ngày tải lên: 08/08/2014, 21:23