CN114006832B - 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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- CN114006832B CN114006832B CN202111169958.XA CN202111169958A CN114006832B CN 114006832 B CN114006832 B CN 114006832B CN 202111169958 A CN202111169958 A CN 202111169958A CN 114006832 B CN114006832 B CN 114006832B
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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
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, ws service is established in the server to be connected with the client, a 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 whether a 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.
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, various web proxy servers exist in the mobile internet, and in the current situation, when a user uses a proxy server to access a web end, the proxy server bypasses IP restriction and the like, thereby causing data leakage and disabling security protection.
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 volume instance within preset time in real time, and if the attribute value of the ws message volume instance is 0, determining that 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 (transmission control protocol) 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 and forwards the message sent by the client firstly, so that whether the message quantity attribute value obtained by the ws message quantity example in the client is 0 or not is detected in a preset time, and whether the message sent by the client is received by the proxy server firstly or not is judged, namely, whether the proxy server exists between the client and the server is detected or not is realized, corresponding protective measures are carried out after the proxy server is detected, and data leakage caused by the client providing the web service for the existence of 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 (transmission control protocol) 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 volume instance within preset time in real time, and if the attribute value of the ws message volume instance is 0, determining that 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 a websocket protocol, a ws service is established in a server to be connected with a client, and a 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 a proxy server, the proxy server is a transparent medium for transmitting data, and does not repeatedly etch the connection configuration of the server, but receives and forwards the message sent by the client first, so that whether the message sent by the client is received first by the proxy server can be judged by detecting whether an attribute value of the message quantity obtained by a ws message quantity example in the client is 0 within a preset time, that is, whether the proxy server detects whether the proxy server exists between the client and the server, so as to perform corresponding safeguard measures after detecting the proxy server, and avoid data leakage caused by the server providing web service for the client with the proxy service.
Further, the sending a 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, acquiring 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 within 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.
It can be known from the above description that, when the client sends a message to the server, since the TCP window is set to 0, the ws service refuses to accept the message 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 quantity 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 (transmission control protocol) 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 volume instance within preset time in real time, and if the attribute value of the ws message volume instance is 0, determining that 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 concept, in cooperation with the method for detecting the existence of the proxy service between the client and the server, a terminal for detecting the existence of the proxy service between the client and the server is provided, 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 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 data transmission medium and cannot repeat connection configuration of the server, and the message sent by the client is received first and then forwarded, so that whether the message quantity attribute value obtained by detecting the ws message quantity example in the client is 0 or not can be detected within a preset time to judge whether the message sent by the client is received first by the proxy server or not, namely, detection whether the proxy server exists or not is realized, and corresponding safeguard 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 existence of the proxy service is avoided.
Further, the sending a 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, acquiring 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 within 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 is 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 a websocket protocol in a 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, wherein if the attribute value of the ws message quantity instance is 0, a proxy server exists between the client and the server.
Therefore, under the condition of no proxy server, as the TCP receiving window is 0, the ws service cannot receive any message sent by the client, so that the attribute value of the ws message quantity instance is not changed, and is always the message quantity value of the random text message, but under the condition of the proxy server, the information sent by the client is received first and then forwarded, so that the attribute value of the ws message quantity instance is changed into 0 because the random text message is sent out, and 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 obtained by the ws message quantity instance in the client is 0 or not within the preset time, so that corresponding safeguard 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.
As shown in fig. 2, the second embodiment of the present invention is:
based on the above embodiments, in this embodiment, as shown in fig. 2, a browser is used as the client, and nodejs (JavaScript operating environment based on ChromeV8 engine) is used as an example to create a ws service with domain name ws: 10.0.0.1.
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 volume of the random text information always exists in the bufferAmount, namely the attribute value of the bufferAmount is not 0.
Therefore, in this embodiment, the preset time of 2MSL is continuously repeated for multiple times 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 example 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 can 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 the terminal for detecting the presence of the proxy service between the client and the 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 receiving window of the ws service to 0, at this time, when the client sends a message to the server, since the TCP receiving window is 0, the ws service does not receive any message sent by the client, but for the proxy server, it is a transparent medium for transferring data, and does not repeat the connection configuration of the server, but receives and forwards the message sent by the client first, so that it can determine whether there is a message received by the proxy server first by detecting the attribute value of the message quantity obtained by the ws message quantity instance in the client within the preset time, i.e., it is implemented whether there is a detection of the proxy server between the client and the server, so as to perform a corresponding safeguard measure after detecting the proxy server, thereby avoiding that the server provides a web service for the client having the proxy service and causing data leakage, wherein the preset time is twice the message time and there is no detection of the longest message received by the proxy server, and further avoiding the detection of the occurrence of a slow detection of the occurrence of some instances of the detection of the proxy server.
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 (8)
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 (transmission control protocol) receiving window of the ws service is set to be 0;
s2, initializing a ws message volume instance, and sending a message to the server, wherein the ws message volume instance is used for acquiring message volume which is not successfully sent to the server, and the ws message volume instance is an instance which is set on a browser on the client and is used for corresponding to the ws service when the browser establishes a connection relation with the ws service;
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, acquiring 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 within 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. 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 (transmission control protocol) 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 the ws message quantity instance is an instance which is set on a browser on the client and is used for corresponding to the ws service when the browser establishes a connection relation with the ws service;
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.
6. The terminal for detecting the presence of the proxy service between the client and the server according to claim 5, wherein the sending a message to the server in S2 specifically includes:
and sending a string of random text information to the server.
7. The terminal for detecting the presence of the proxy service between the client and the server according to claim 6, wherein the S3 specifically includes the following steps:
s31, acquiring 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 within 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.
8. The terminal for detecting the presence of the proxy service between the client and the server according to claim 5, wherein the predetermined time is twice the longest message lifetime.
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