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🦑Configuration example of proxy server and router
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1) rapid development of network technology, so that enterprises LAN access INTERNET more and more ways to share resources, For the most part, DDN special line with its stable performance, expansion The advantage of good performance has become a commonly used method.

2) The DDN connection is simple in terms of hardware requirements. Only one router (router) and proxy server (proxy server) are required, but many system configuration Network managers are a more difficult problem. Taking CISCO routers as an example, the author introduces several successful configuration methods for the reference of peers:

1. Configuration of accessing Internet resources directly through the router

2. The general idea and the equipment connection method
In general, Internal LAN use reserved addresses on the INTERNET:
10.0.0.0/8:10.0.0.0~10.255.255.255
172.16.0.0/12:172.16.0.0~172.31.255.255
192.168. 0.0 / 16: 192.168.0.0 ~ 192.168.255.255

3.Under normal circumstances, when the workstations inside the unit directly use routing to access externally, they will be filtered out by the router because the workstations use reserved addresses on the Internet, resulting in inaccessibility Internet resources. The solution to this problem is to use the NAT (Network Address Translation) address translation function provided by the routing operating system to convert the private address of the internal network into a legal address on the Internet, so that users without a legal IP address can access it through NAT. External Internet. The advantage of this is that there is no need to be equipped with a proxy server, reducing investment, it can also save legal IP addresses and improve the security of the internal network.

4.There are two types of NAT: Single mode and global mode.
Using the single mode of NAT, just like its name, it can map many local LAN hosts to an Internet address. All hosts in the local area network are regarded as an Internet user to the external Internet network. Hosts in the local area network continue to use the local address.
Using the global mode of NAT, the router's interface maps many local LAN hosts to a certain range of Internet addresses (IP address pool). When the local host port is connected to a host on the Internet, an IP address in the IP address pool is automatically assigned to the local host. The dynamically assigned IP address will be released after the connection is interrupted, and the released IP address can be used by other local hosts. use.
Taking the network environment of my unit as an example, the configuration method and process are listed below for your reference.
Our unit uses Unicom optical cable (V.35) to connect to the Internet. The router is CISCO2610. The LAN uses INTEL550 100M switch. Unicom provides us with the following four IP addresses:
211.90.137.25 (255.255.255.252) for local WAN port router
port 211.90.137.26 (255.255.255.252) for the other side (China Unicom) is
211.90.139.41 (255.255.255.252) for their disposal
211.90.139.42 (255.255.255.252) for their disposal

🦑Configuration example of proxy server and router part 2

2) The configuration of the router
en
config t

> ip nat pool c2610 211.90.139.41 211.90.139.42 netmask 255.255.255.252
(define an address pool c2601, which contains two free legal IP addresses for NAT Used during conversion)
int e0 / 0
ip address 192.168.0.3 255.255.255.0
ip nat inside
exit

> (set the IP address of the Ethernet port and set it as the port connected to the internal network)
interface s0 / 0
ip address 211.90.137.25 255.255.255.252
ip nat outside
exit

> (Set the IP address of the WAN port and set it as the port to connect to the external network)
ip route 0.0.0.0 0.0.0.0 211.90.137.26
(set the dynamic route)
access-list 2 permit 192.168.0.1 0.0.0.255
(establish the access control list )
! Dynamic NAT
!
Ip nat inside source list 2 pool c2610 overload
(establish dynamic address translation)
line console 0
exec-timeout 0 0
!
Line vty 0 4
end
wr
(save the settings made)

🦑Configuration example of proxy server and router part 3

3) Workstation configuration

1-requires static IP address, set in the TCP / IP properties and set off to network 192.168.0.3 (the IP address of the router Ethernet port), the address is provided, the Internet browser and other tools to provide access to the DNS in No special settings are required.

2-Second, access to INTERNET resources through a proxy server configuration

3-General idea and equipment connection method
The advantage of using proxy server to access INTERNET resources is that the CACHE service provided by the proxy server can be used to improve the access speed and efficiency of INTERNET. It is more suitable for units with more workstations. The disadvantage is that it needs to be equipped with a computer as a proxy server, which increases the investment cost; and it requires two more legal IP addresses than the first legal method, and the network security is not high.

4-To use this scheme to access the Internet, the device connection method is as follows:
two network cards are installed on the proxy server, one is connected to the internal network, and the internal private address is set; And set its gateway to 211.90.139.41 (router Ethernet port)
router Ethernet port also set the legal IP address (211.90.139.41) assigned by Unicom

5- connecting the device, install the proxy software on the proxy server and set it on the workstation An agent can access INTERNET.

🦑Configuration example of proxy server and router part 4

Router configuration

(1) Network connection diagram:
Note: In the above figure, all computers in the unit communicate directly with the internal network card (192.168.0.4) on the proxy server through the switch, and then pass under the control of the proxy service software The router accesses the Internet.
(2) Configuration of the router
en
config t
int e0 / 0
ip address 211.90.139.41 255.255.255.252
exit
(set the IP address of the Ethernet port)
interface s0 / 0
ip address 211.90.137.25 255.255.255.252
exit
(set the IP address of the WAN port)
ip route 0.0.0.0 0.0.0.0 211.90.137.26
ip routing
(set the dynamic route and activate the route)
end
wr
(save the settings made)

🦑Configuration example of proxy server and router part 5


5) Proxy settings

> proxy server must be installed by two network cards, one for connection to the internal LAN, the IP address set for the internal private address (eg: 192.168.0.4 netmask 255.255.255.0) without providing a gateway. The other one is used to connect to the router, set the legal address assigned by Unicom (211.90.139.42 netmask 255.255.255.252), and set its gateway to: 211.90.139.41 (router Ethernet port).

> After setting up the network card according to the above method, install another set of agent software. (For example: MS PROXY SERVER 2.0, WINGATE, etc., please refer to other materials for the installation and debugging methods of the agent software)

6) Workstation setup
(1) INTERNET EXPLORER set
Tools menu -> internet options -> Connections -> LAN Settings -> Use a proxy server -> Address: 192.168.0.4 port: 80> OK


🦑Router configuration
en
config t
ip nat pool c2610 211.90.139.41 211.90.139.42 netmask 255.255.255.252
(define an address pool c2601, which contains two free legal IP addresses , For NAT conversion)
int e0 / 0
ip address 192.168.1.1 255.255.255.0
ip nat inside
exit
(set the Ethernet port's IP address and set it as the port to connect to the internal network)
interface s0 / 0
ip address 211.90.137.25 255.255.255.252
ip nat outside
exit
(set the WAN port IP address, and set it as the port to connect to the external network)
ip route 0.0.0.0 0.0.0.0 211.90.137.26
(set dynamic routing)
access-list 2 permit 192.168.0.1 0.0.0.255
(establish access control list)
! Dynamic NAT
!
ip nat inside source list 2 pool c2610 overload
(establish dynamic address translation)
line console 0
exec-timeout 0 0
!
line vty 0 4
end

wr
(save settings made)

🦑Configuration example of proxy server and router part 6-final


1) Proxy server settings

> Two network cards are installed on the proxy server, and both network cards are connected to the switch. The network card 1 sets the IP address as 192.168.0.4 without a gateway; the network card 2 sets the IP address as 192.168.1.2 and sets its gateway as 192.168.1.1 (Router Ethernet port).

> After setting up the network card according to the above method, install another set of agent software. (For example: MS PROXY SERVER 2.0, WINGATE, etc., please refer to other materials for the installation and debugging methods of the agent software)
Note: When installing the agent software (using MS-PROXY 2.0 as an example), when specifying the LAT table, the address range should be 192.168 .0.0-192.168.255.255 is excluded, otherwise the proxy will not work properly.

2) The workstation is provided
under this configuration, the workstation may be provided by a proxy access may also be provided directly to the Internet through a gateway.
If you only access the Internet through a proxy, the setting method is exactly the same as

🦑Method 2.

1) If you want to access the Internet only through the gateway, the workstation must be set to a static IP address. The IP address should be set to 192.168.1.X, which
is on the same network segment as the router Ethernet port, and the gateway should be set to: 192.168.1.1, and DNS to be the access provider The address provided.

2) If you want the two methods to coexist, you need to set two static IP addresses in TCP / IP: 192.168.0.X and 192.168.1.X, and set the gateway to: 192.168.1.1, DNS is the address provided by the access provider . When in use, you only need to open or close the proxy settings in the browser and other software to switch between the proxy and the gateway.

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🦑Configuration example of proxy server and router full 6 parts

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🦑important if you have website:


A) Determine if there is an injection point

This is very simple. The most common thing we see is the format of the page: index.php? Id = 2. We know that PHP is often used with the MYSQL database. There must be a table in the MYSQL database, such as setting_table When we submit the above address, the program generally handles it like this:

1.Use GET or POST to get the id = 1 we submitted and pass this value to a variable id.

2. Query: select * from setting_table where id = $ id

The above statement is the query statement, we substitute $ id = 1 is:

select * from setting_table where id = 1

🦑There is no problem with this statement, the information with id 1 will be taken out and displayed to us, so we can see the normal page.

See how we judge:

1. We submit id = 1 and 1 = 1

Let's see what this effect is. The $ id here is 1 and 1 = 1. Let's see what it looks like:

select * from setting_table where id = 1 and 1 = 1

This statement adds an and statement, followed by 1 = 1 is definitely true, so it does not affect the establishment of the above statement, it will also take out the information of id = 1 to display to us, so we see the original normal page.

2. We submit id = 1 and 1 = 2

Take a look at what this effect is. The $ id here is 1 and 1 = 2.

select * from setting_table where id = 1 and 1 = 2

Analyzing this statement, the previous is still the same, except that at the end, and 1 = 2, this is naturally not true! And because it is connected with and, so naturally can not find the conditions! It can only echo us back to an error Or blank page pull ~ !!

The above is the basic reason that we generally use and 1 = 1 & and 1 = 2 to judge, but here we should pay attention to a few points, as follows:

1. When the program is processed, it must be where id = $ id instead of where id = $ id, this single quote is very different, how is it different, I will talk about it later.

2. The program did not process the parameters we submitted or did not handle them well, which led us to submit directly. If the program has more parameters we submitted for processing, it will be different, and it will be later!

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🦑important if you have website 2 :

Quickly determine the MYSQL version

Premise: You get an injection point, for example: news.php? Id = 1

This point is what you found. Submitting and 1 = 1 and and 1 = 2 are different.

We can guess the version of MYSQL like this. . Proceed as follows:

1. Submit /news.php?id=1/*!40000%20s*/ If it returns to normal, it means that the MYSQL version is below the 4000 version, you can adjust the highest digit in turn, for example, I changed to 39000, if it is normal , Submit 38000 ... until the error message is returned, the last fixed one is the MYSQL version.

The following is the process when I submit the test (only write MYSQL version)

40000 (+)-39000 (+)-38000 (+)-370000 (-)-37900 (+)-37800 (+)-37700 (-)-End !!

The MYSQL version is 37700.

2. In general, we do n’t guess the specific version. We only care whether MYSQL is above 4.0. I think that only MYSQL above 4.0 supports UNION query. The following is not supported, so we often only use / *! 40000% 20s * / See if it is version 4.0 or higher.

PS: / *! 40000% 20s * / here /*!......*/ is a special way of commenting in mysql, there is nothing strange, remember how to use it ~

Lecture 3: How to get the table name by PHP injection.

Ready to write, see someone asked, sum it up, let's count to the third lecture!

Quote:
Originally posted by spirit at 2006-5-16 05:57 PM:

I read a lot of articles ... the eyes are all spent

The things involved are more comprehensive

But I still don't know how to make a table

You can't go directly to the field .. ??

Come one by one

Database table field values ...

I think this logic is correct ...

By the way, I still feel ...

The table is really not easy to do, unlike ASP may be directly exposed, PHP is still not available, we generally have two methods:

1. Guess by experience: For example, admin, user, news, vote, wenzhang, guanliyuan, etc., which are commonly used by everyone, there is no way.

2. Exploit code view: Use Load_file to explode the file code, you can see what table and what field the data is interpolated into, this is very clear, but load_file is also very skillful. . I'll talk about it later.

🦑To be specific:

1. There is nothing to say about this, just guess directly. For example, if you see an injection point, similar to news.php? Id = 1, you can get specific fields by union query, such as: news.php? Id = 1 and 1 = 2 union select 1,2,3,4 is established,

You can guess this: news.php? Id = 1 and 1 = 2 union select 1,2,3,4 from admin / * If there is an admin table, it will return true, otherwise there will be no table admin, other and this the same.

2. This is a bit ultimate. For example, if you get his absolute path, you can load_file (file path) the code of the file. For example, if you violently log in to the administrator's login page, you can see the SQL statement in him Which table did he take the value from, right? "

The principle is like this, think a lot, what you have learned, I hope to share.

🦑 The difference between quotation marks

Many friends do not understand the role of that quote, and think that adding quotes is the same as not adding.

The quotation marks (including single and double) have a great influence on our injection. Here is mainly related to the state of magic. When the magic is off, it has no effect. When the magic is on, it is very different Too. .

Tips: When magic is on, it is the single quote ('), double quote ("), (\), space (), etc. that are automatically submitted for us, plus the escape symbol \, so that the upper ones become (\' ), (\ ”), (\\), etc., this is too troublesome for us to inject, examples are as follows.

1. The first example (without quotes)

If the statement is as follows:

QUOTE:
select * from news where newsid = $ id

1. The situation when magic is off

When it is off, the data information submitted by us will not be processed, assuming that an SQL statement is like this;

We can submit the value of $ id in the URL, as we said before to give $ id:

$ id = 1 union select 1,2,3,4 from admin

You can basically get the data we want.

2. The situation when magic is on

There is no difference at this time because we did not submit sensitive characters

Second, the second example looks at the SQL statement it processes:

QUOTE:
select * from news where newsid = $ id


At this time, to successfully use the unfiltered parameter $ id, we can submit as follows:

$ id = 1 'union select 1,2,3,4 from admin / *

There must be a () to close the front, and then add a / * to comment out the back

1. The situation when magic is off

If magic is off, we can submit it directly and use it successfully

2. The situation when magic is on

If magic is on, then the statement we submitted becomes:

$ id = 1 \ 'union select 1,2,3,4 from admin / *

Look, there is no way to use it (although there are loopholes)


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