CN114006832A - Method and terminal for detecting proxy service between client and server - Google Patents
Method and terminal for detecting proxy service between client and server Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/20—Network architectures or network communication protocols for network security for managing network security; network security policies in general
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/161—Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields
- H04L69/162—Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields involving adaptations of sockets based mechanisms
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Abstract
The invention provides a method and a terminal for detecting the existence of proxy service between a client and a server, which comprises the following steps: establishing a connection relation with a ws service based on a websocket protocol in a server, wherein a TCP (Transmission control protocol) receiving window of the ws service is set to be 0; initializing a ws message quantity instance, and sending a message to a server, wherein the ws message quantity instance is used for acquiring the message quantity which is not successfully sent to the server; and detecting the attribute value of the ws message quantity instance in the preset time in real time, wherein if the attribute value of the ws message quantity instance is 0, a proxy server exists between the client and the server. The method is based on the websocket protocol, the ws service is established in the server to be connected with the client, the TCP receiving window of the ws service is set to be 0, when the client sends a message, whether the attribute value of the ws message quantity example is 0 or not is detected in the preset time, so that the detection whether a proxy server exists between the client and the server is realized, and data leakage caused by the fact that the server provides web service for the client with the proxy service is avoided.
Description
Technical Field
The invention relates to the technical field of web security protection, in particular to a method and a terminal for detecting the existence of proxy service between a client and a server.
Background
Today, there are various web proxy servers, and in the current situation, when a user accesses a web end by using a proxy server, the proxy server bypasses IP restrictions and the like, thereby causing data leakage and disabling security.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method and the terminal for detecting the proxy service between the client and the server are provided, so that whether the proxy server exists between the client and the server is detected, and data leakage caused by the fact that the server provides web service for the client with the proxy service is avoided.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method for detecting the existence of proxy service between a client and a server comprises the following steps:
s1, establishing a connection relation with a ws service based on a websocket protocol in a service end, wherein a TCP receiving window of the ws service is set to be 0;
s2, initializing a ws message quantity instance, and sending a message to the server, wherein the ws message quantity instance is used for acquiring the message quantity which is not successfully sent to the server;
and S3, detecting the attribute value of the ws message quantity instance in the preset time in real time, and if the attribute value of the ws message quantity instance is 0, a proxy server exists between the client and the server.
In order to solve the above technical problem, another technical solution provided by the present invention is:
a terminal for detecting the presence of a proxy service between a client and a server, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
s1, establishing a connection relation with a ws service based on a websocket protocol in a service end, wherein a TCP receiving window of the ws service is set to be 0;
s2, initializing a ws message quantity instance, and sending a message to the server, wherein the ws message quantity instance is used for acquiring the message quantity which is not successfully sent to the server;
and S3, detecting the attribute value of the ws message quantity instance in the preset time in real time, and if the attribute value of the ws message quantity instance is 0, a proxy server exists between the client and the server.
The invention has the beneficial effects that: the invention provides a method and a terminal for detecting the existence of proxy service between a client and a server, based on a websocket protocol, a ws service is established in the server to be connected with the client, and a TCP receiving window of the ws service is set to be 0, at the moment, when the client sends a message to the server, the ws service cannot receive any message sent by the client because the TCP receiving window is 0, but for the proxy server, the proxy server is a transparent medium for transmitting data and does not repeatedly carve the connection configuration of the server, but receives the message sent by the client and forwards the message, so whether the attribute value of the message quantity obtained by the ws message quantity example in the client is 0 or not is detected in a preset time, thereby judging whether the message sent by the client is received by the proxy server first or not, namely, realizing the detection of whether the proxy server exists between the client and the server or not, and corresponding protection measures are carried out after the proxy server is detected, so that data leakage caused by the fact that a server side provides web service for a client side with the proxy service is avoided.
Drawings
FIG. 1 is a general flow chart of a method for detecting the presence of a proxy service between a client and a server according to the present invention;
FIG. 2 is a flowchart of an embodiment of a method for detecting the presence of a proxy service between a client and a service ticket;
fig. 3 is a schematic structural diagram of a terminal for detecting the presence of a proxy service between a client and a server according to the present invention.
Description of reference numerals:
1. a terminal for detecting the existence of proxy service between a client and a server; 2. a memory; 3. a processor.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Before this, in order to facilitate understanding of the technical solution of the present invention, the following explanations are made for acronyms and terms related to the present invention:
1. websocket: a network transport protocol that enables full duplex communication over a single TCP connection, ws being abbreviated therein;
2. bufferedAmount: the websocket instance in the browser end is used for acquiring the message volume which is not sent out by the browser;
3. MSL: the message is an English abbreviation of Maximum Segment Lifetime, which means the longest message Lifetime.
Referring to fig. 1 and 2, a method for detecting that there is a proxy service between a client and a server includes the steps of:
s1, establishing a connection relation with a ws service based on a websocket protocol in a service end, wherein a TCP receiving window of the ws service is set to be 0;
s2, initializing a ws message quantity instance, and sending a message to the server, wherein the ws message quantity instance is used for acquiring the message quantity which is not successfully sent to the server;
and S3, detecting the attribute value of the ws message quantity instance in the preset time in real time, and if the attribute value of the ws message quantity instance is 0, a proxy server exists between the client and the server.
As can be seen from the above description, the beneficial effects of the present invention are: based on the websocket protocol, establishing a ws service in the service end to be connected with the client, and sets the TCP receive window of the ws service to 0, at which time when the client sends a message to the server, since the TCP receive window is 0, the ws service will not receive any message from the client, but for the proxy server, it is a transparent medium for transferring data, and does not duplicate the connection configuration of the server, but receives the information sent by the client and then forwards the information, so that whether the information sent by the client is received by the proxy server first can be judged by detecting whether the attribute value of the message quantity acquired by the ws message quantity example in the client is 0 or not in the preset time, the detection of whether the proxy server exists between the client and the server is realized, so that corresponding protective measures are carried out after the proxy server is detected, and data leakage caused by the fact that the server provides web service for the client with the proxy service is avoided.
Further, the sending of the message to the server in S2 specifically includes:
and sending a string of random text information to the server.
According to the description, the client randomly sends a string of text information to the server, so that the detection of whether the proxy server exists between the client and the server is realized subsequently while more threads are occupied.
Further, the S3 specifically includes the following steps:
s31, obtaining the message volume attribute of the random text message through the ws message volume example;
and S32, detecting the attribute value of the ws message quantity instance for multiple times in the preset time, wherein if the attribute value of the ws message quantity instance is changed from a value to 0, the proxy server exists between the client and the server, otherwise, the proxy server does not exist between the client and the server.
As can be seen from the above description, when the client sends a message to the server, since the TCP window is set to 0, the ws service refuses to accept the information sent by the client at this time, and if no proxy server exists at this time, the message should still be stored in the client, that is, the attribute value of the ws message volume instance always exists; if the proxy server exists at the moment, the message is acquired by the proxy server, namely the attribute value of the ws message quantity instance becomes 0, and the detection of detecting the attribute value of the ws message quantity instance for multiple times within the preset time is repeated, so that the accuracy of detecting whether the proxy server exists is ensured.
Further, the preset time is twice the longest message lifetime.
As can be seen from the above description, the longest message lifetime with twice the preset time is set, so that the situation that the proxy server does not exist due to the fact that the attribute value of the ws message quantity instance is valued and the proxy server does not exist in false detection because the message sent by the client is not acquired within some time because some proxy servers receive data slowly is avoided, and the accuracy of detection is further improved.
Further, the ws message volume instance is an instance which is set on a browser on the client and used for corresponding to the ws service when the browser establishes a connection relationship with the ws service.
According to the above description, when the ws communication connection is established between the client and the server, an instance corresponding to the ws service on the server is automatically generated on the client, and is used to obtain the amount of messages that are not successfully sent to the server, and to monitor whether the client successfully sends the messages to the server in real time.
Referring to fig. 3, a terminal for detecting the presence of a proxy service between a client and a server includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the following steps:
s1, establishing a connection relation with a ws service based on a websocket protocol in a service end, wherein a TCP receiving window of the ws service is set to be 0;
s2, initializing a ws message quantity instance, and sending a message to the server, wherein the ws message quantity instance is used for acquiring the message quantity which is not successfully sent to the server;
and S3, detecting the attribute value of the ws message quantity instance in the preset time in real time, and if the attribute value of the ws message quantity instance is 0, a proxy server exists between the client and the server.
As can be seen from the above description, the beneficial effects of the present invention are: based on the same technical conception, in cooperation with the method for detecting the existence of the proxy service between the client and the server, the terminal for detecting the existence of the proxy service between the client and the server is provided, based on the websocket protocol, the ws service is established in the server to be connected with the client, and the TCP receiving window of the ws service is set to be 0, at this time, when the client sends a message to the server, because the TCP receiving window is 0, the ws service cannot receive any message sent by the client, but for the proxy server, the proxy server is a transparent medium for transmitting data, does not repeat the connection configuration of the server, and firstly receives and then forwards the message sent by the client, therefore, whether the attribute value of the message quantity obtained by detecting the ws message quantity example in the client is 0 or not can be detected in the preset time so as to judge whether the message sent by the client is received by the proxy server firstly, the detection of whether the proxy server exists between the client and the server is realized, so that corresponding protective measures are carried out after the proxy server is detected, and data leakage caused by the fact that the server provides web service for the client with the proxy service is avoided.
Further, the sending of the message to the server in S2 specifically includes:
and sending a string of random text information to the server.
According to the description, the client randomly sends a string of text information to the server, so that the detection of whether the proxy server exists between the client and the server is realized subsequently while more threads are occupied.
Further, the S3 specifically includes the following steps:
s31, obtaining the message volume attribute of the random text message through the ws message volume example;
and S32, detecting the attribute value of the ws message quantity instance for multiple times in the preset time, wherein if the attribute value of the ws message quantity instance is changed from a value to 0, the proxy server exists between the client and the server, otherwise, the proxy server does not exist between the client and the server.
As can be seen from the above description, when the client sends a message to the server, since the TCP window is set to 0, the ws service refuses to accept the information sent by the client at this time, and if no proxy server exists at this time, the message should still be stored in the client, that is, the attribute value of the ws message volume instance always exists; if the proxy server exists at the moment, the message is acquired by the proxy server, namely the attribute value of the ws message quantity instance becomes 0, and the detection of detecting the attribute value of the ws message quantity instance for multiple times within the preset time is repeated, so that the accuracy of detecting whether the proxy server exists is ensured.
Further, the preset time is twice the longest message lifetime.
As can be seen from the above description, the longest message lifetime with twice the preset time is set, so that the situation that the proxy server does not exist due to the fact that the attribute value of the ws message quantity instance is valued and the proxy server does not exist in false detection because the message sent by the client is not acquired within some time because some proxy servers receive data slowly is avoided, and the accuracy of detection is further improved.
Further, the ws message volume instance is an instance which is set on a browser on the client and used for corresponding to the ws service when the browser establishes a connection relationship with the ws service.
According to the above description, when the ws communication connection is established between the client and the server, an instance corresponding to the ws service on the server is automatically generated on the client, and is used to obtain the amount of messages that are not successfully sent to the server, and to monitor whether the client successfully sends the messages to the server in real time.
Referring to fig. 1, a first embodiment of the present invention is:
a method for detecting the presence of a proxy service between a client and a server, as shown in fig. 1, includes the steps of:
s1, establishing a connection relation with a ws service based on the websocket protocol in the service end, and setting a TCP receiving window of the ws service to be 0.
S2, initializing a ws message quantity instance, and sending a message to the server, wherein the ws message quantity instance is used for acquiring the message quantity which is not successfully sent to the server;
in this embodiment, in step S2, a message is sent to the server, specifically, a string of random text information is sent to the server.
When the client sends a message to the server, the ws message volume instance is in a state of having a value because of the random text information sent by the client, and the value is the message volume of the random text information.
And S3, detecting the attribute value of the ws message quantity instance in the preset time in real time, and if the attribute value of the ws message quantity instance is 0, a proxy server exists between the client and the server.
Therefore, in the case of no proxy server, since the TCP receiving window is 0, the ws service will not receive any message from the client, so that the attribute value of the ws message volume instance will not change, and thus always the message size value of the random text message, but for the case where there is a proxy server, the message sent by the client is received and then forwarded, so that the attribute value of the ws message volume instance becomes 0 due to the sending of the random text message, therefore, whether the detection of the proxy server exists between the client and the server can be judged by detecting whether the attribute value of the message quantity acquired by the ws message quantity instance in the client is 0 or not within the preset time, and corresponding protection measures are carried out after the proxy server is detected, so that data leakage caused by the fact that a server side provides web service for a client side with the proxy service is avoided.
As shown in fig. 2, the second embodiment of the present invention is:
on the basis of the above embodiment, in this embodiment, as shown in fig. 2, a browser is used as the client, and nodejs (JavaScript running environment based on ChromeV8 engine) is used as an example to create a ws service with domain name ws:10.0.0.1:8888, because the ws service is built on the server, at this time, the ws service can be directly identical to the server.
At this time, a ws message volume instance is initialized at the browser side and linked with the domain name of the ws service, where in this embodiment, as shown in fig. 2, the ws message volume instance is specifically an instance buffered ampout that is set on the browser when the browser on the client establishes a connection relationship with the ws service and is used for corresponding to the ws service, and may be used to obtain a message volume that the client does not successfully send to the service side, that is, to implement real-time monitoring of whether the client successfully sends a message to the service side.
After the ws service is connected to the browser, the windows size is set to 0, that is, the state of suspending receiving the content is suspended.
At this time, when the browser sends a string of random text information to the ws service, since the windows size of the ws service is 0, the ws service will not receive the random text information, and therefore, the bufferdAmount of the browser end will obtain the message volume attribute of the random text information at this time.
Meanwhile, as shown in fig. 2, when a proxy server exists between the browser and the ws service, the random text information sent to the ws service by the browser is acquired by the proxy server, and is stored in the proxy server for waiting for forwarding, and the bufferdamount acquires the empty message amount after the random text information is sent out in the browser, that is, the attribute value of the bufferdamount is changed from the message amount of the random text information to 0; if the proxy server does not exist between the browser and the ws service, the message amount of the random text information always exists in the bufferdAmount, that is, the attribute value of the bufferdAmount is not 0.
Therefore, in this embodiment, the preset time of 2MSL is continuously repeated to detect whether the attribute value of the buffered _ amount is 0, if so, it can be determined that a proxy server exists between the client and the server, where 2MSL is twice the longest message lifetime, which is about 60s, and in this embodiment, the preset time is set to 60s, so as to avoid the situation that the attribute value of the ws message volume instance is valued and the proxy server does not exist due to the fact that some proxy servers do not acquire the message sent by the client within some time because of slow data reception, thereby further improving the accuracy of detecting whether the proxy server exists. Meanwhile, in other equivalent embodiments, the preset time may also be determined according to actual needs.
Referring to fig. 3, a third embodiment of the present invention is:
a terminal 1 for detecting the presence of a proxy service between a client and a server comprises a memory 2, a processor 3 and a computer program stored on the memory 2 and executable on the processor 3, wherein the processor 3, when executing the computer program, implements the steps of the method for detecting the presence of a proxy service between a client and a server as in the first or second embodiment.
To sum up, the method and terminal for detecting the presence of proxy service between a client and a server according to the present invention establish a ws service in the server to connect with the client based on the websocket protocol, and set the TCP receive window of the ws service to 0, at this time, when the client sends a message to the server, since the TCP receive window is 0, the ws service does not receive any message sent from the client, but for the proxy server, it is a transparent medium for transferring data, and does not duplicate the connection configuration of the server, but receives and forwards the message sent from the client first, so it can determine whether the message sent from the client is received first by the proxy server by detecting whether the attribute value of the message quantity obtained by the ws message quantity instance in the client is 0 within the preset time, that is, it is implemented to detect whether the proxy server exists between the client and the server, the method has the advantages that corresponding protection measures are carried out after the proxy server is detected, data leakage caused by the fact that the server side provides web services for the client side with the proxy service is avoided, wherein the preset time is twice as long as the longest message time, and the detection is carried out for multiple times in the preset time, the situation that the proxy server receives data slowly, so that the attribute value of the ws message quantity example is not acquired in certain time, and the proxy server does not exist in false detection is avoided, and the accuracy of detecting whether the proxy server exists is further improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for detecting the existence of proxy service between a client and a server is characterized by comprising the following steps:
s1, establishing a connection relation with a ws service based on a websocket protocol in a service end, wherein a TCP receiving window of the ws service is set to be 0;
s2, initializing a ws message quantity instance, and sending a message to the server, wherein the ws message quantity instance is used for acquiring the message quantity which is not successfully sent to the server;
and S3, detecting the attribute value of the ws message quantity instance in the preset time in real time, and if the attribute value of the ws message quantity instance is 0, a proxy server exists between the client and the server.
2. The method according to claim 1, wherein the step S2 of sending a message to the server specifically includes:
and sending a string of random text information to the server.
3. The method according to claim 2, wherein the S3 specifically includes the following steps:
s31, obtaining the message volume attribute of the random text message through the ws message volume example;
and S32, detecting the attribute value of the ws message quantity instance for multiple times in the preset time, wherein if the attribute value of the ws message quantity instance is changed from a value to 0, the proxy server exists between the client and the server, otherwise, the proxy server does not exist between the client and the server.
4. The method according to claim 1, wherein the predetermined time is twice the longest message lifetime.
5. The method according to claim 1, wherein the ws message volume instance is an instance set on a browser at the client for corresponding to the ws service when the browser is connected to the ws service.
6. A terminal for detecting the presence of a proxy service between a client and a server, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to perform the steps of:
s1, establishing a connection relation with a ws service based on a websocket protocol in a service end, wherein a TCP receiving window of the ws service is set to be 0;
s2, initializing a ws message quantity instance, and sending a message to the server, wherein the ws message quantity instance is used for acquiring the message quantity which is not successfully sent to the server;
and S3, detecting the attribute value of the ws message quantity instance in the preset time in real time, and if the attribute value of the ws message quantity instance is 0, a proxy server exists between the client and the server.
7. The terminal for detecting the presence of the proxy service between the client and the server according to claim 6, wherein in S2, a message is sent to the server, specifically:
and sending a string of random text information to the server.
8. The terminal for detecting the presence of a proxy service between a client and a server according to claim 7, wherein the S3 specifically includes the following steps:
s31, obtaining the message volume attribute of the random text message through the ws message volume example;
and S32, detecting the attribute value of the ws message quantity instance for multiple times in the preset time, wherein if the attribute value of the ws message quantity instance is changed from a value to 0, the proxy server exists between the client and the server, otherwise, the proxy server does not exist between the client and the server.
9. The terminal for detecting the presence of a proxy service between a client and a server according to claim 6, wherein the predetermined time is twice the longest message lifetime.
10. The terminal of claim 6, wherein the ws message volume instance is an instance set on a browser at the client for corresponding to the ws service when the browser is connected to the ws service.
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