CN106874245B - Dynamic Flag processing method and device for CTF online competition platform - Google Patents
Dynamic Flag processing method and device for CTF online competition platform Download PDFInfo
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Abstract
The invention discloses a dynamic Flag processing method and a dynamic Flag processing device for a CTF online competition platform, wherein the method comprises the following steps: when a request of a user for visiting a question target is received, generating and storing dynamic flags, wherein the dynamic flags generated when different users visit the same question and the same user visits different questions are different; replacing information in the original question with the generated dynamic Flag, generating a new question and returning the new question to the user; and when the Flag submitted by the user is received, comparing the Flag with the stored Flag, and judging whether the Flag submitted by the user is correct. Compared with the prior art, the method and the system can effectively reduce the behaviors of the players for interacting with the Flag and acquiring the Flag of other people, lead the players to concentrate on the subject, give up the illusion of acquiring the Flag from other non-problem solving ways, and further discover the possible cheating behaviors of the players so as to conveniently carry out operations of warning, shielding, releasing and the like on the cheating players.
Description
Technical Field
The invention relates to a dynamic Flag processing method and device for a CTF online competition platform, and belongs to the technical field of information processing.
Background
CTF (capture The flag) Chinese is generally translated into flag-robbing contests, and is a popular information security contest form. The general flow of the method is that a string of character strings or other contents with a certain format is obtained from the competition environment given by the host firstly through the forms of attack and defense confrontation, program analysis and the like among the competition teams, and the string or other contents are submitted to the host, so that scores are captured. For convenience, we refer to such as "Flag". The CTF competition mode mainly comprises three types, namely a problem solving mode, an attack and defense mode and a mixed mode.
Question solving mode (Jeopardy)
In the solving-problem mode CTF competition system, competition teams can participate through the Internet or a field network, and the CTF competition in the mode is similar to an ACM programming competition and an informatics Olympic competition so as to solve the point value and time of network security technology challenge questions for ranking, and the method is generally used for online selecting and playing games. The topics mainly comprise categories such as reverse, vulnerability mining and utilization, Web penetration, passwords, forensics, steganography, safety programming and the like.
Second, Attack and Defense mode (Attack-Defense)
In the attack and defense mode CTF competition system, competition teams mutually attack and defend in a network space, the network service loopholes are excavated, opponent services are attacked to score, and the service loopholes are repaired to defend so as to avoid losing scores. The attack and defense mode CTF competition system can reflect the competition situation through the score in real time, finally directly scores the victory or defeat according to the score, and is a network security competition system with fierce competition, strong appreciation and high transparency. In this system, not only are the intelligence and skill of the players, but also the physical strength (as the competition generally lasts 48 hours or more), and the division of labor and cooperation among the teams.
Third, mixed mode (Mix)
The CTF competition system combining the problem understanding mode and the attack and defense mode can obtain some initial scores by solving problems for a competition team, and then carry out the zero sum game of score increase and decrease through attack and defense countermeasures, and finally score the victory or defeat with the score high or low.
The problem solving mode generally occurs in online competition and various CTF online competition platforms are carried out, the conventional CTF online competition platform adopts a problem and platform loose coupling mechanism, a problem environment needs to be deployed in advance for a problem in a demand environment, problem content is recorded, and a CTF online competition platform is used for guiding a user to access the conventional content and environment for answering in a competition. The method has the main defects that the title Flag is unique, all teams share the title text/accessories/environment, the Flag is unique, the participating teams/people can obtain other Flag by a non-problem solving means to submit, the platform cannot judge the Flag obtaining way, and the platform cannot distinguish the obtaining way by the Flag.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a dynamic Flag processing method and a dynamic Flag processing device for a CTF online competition platform, which can effectively prevent cheating of contestants.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the following technical scheme:
a dynamic Flag processing method for a CTF online competition platform comprises the following steps:
(1) when a request of a user for visiting a question target is received, generating and storing dynamic flags, wherein the dynamic flags generated when different users visit the same question and the same user visits different questions are different;
(2) replacing information in the original title with the dynamic Flag generated in the step (1), generating a new title and returning the new title to the user;
(3) and when the Flag submitted by the user is received, comparing the Flag with the stored Flag, and judging whether the Flag submitted by the user is correct.
And (3) when the title is a text description type title, replacing the text in the original title with the dynamic Flag in the step (2), and dynamically generating a new title text containing the dynamic Flag.
When the title is an accessory downloading title, modifying the content of the original title according to the dynamic Flag in the step (2), generating a new file and returning the downloading address of the new file to the user; and if the accessory downloading class topic is the compiled executable file, modifying the content of the corresponding code file according to the dynamic Flag, recompiling to generate a new executable file, and returning a downloading address to the user.
Preferably, when the files to be downloaded are a plurality of files, the plurality of files are packaged and the download addresses of the compressed packages are returned to the user.
And (3) when the theme is an online environment type theme, writing the dynamic Flag into the initialization script before environment generation in the step (2) to realize Flag injection into the online environment.
Preferably, the initialization script of the online environment comprises a Flag injection script, in the step (2), the content of the Flag injection script is modified according to the dynamic Flag to generate a new Flag injection script, or the dynamic Flag is used as a parameter to be transmitted to the Flag injection script, then the environment deployment program is called to perform online environment deployment, and the deployed online environment access address is returned to the user.
Preferably, the dynamic Flag in step (1) is a randomly generated character string with a certain length, or a character string obtained by applying an irreversible encryption algorithm to the user information, the title information, and the timestamp.
Preferably, in the step (3), if the Flag submitted by the user is incorrect, whether the user cheats is also judged, and if the Flag submitted by the user is Flag of other users, the cheating behavior between the two users is considered.
A device based on the dynamic Flag processing method of the CTF online competition platform comprises the following steps: the system comprises a user request and response module, a dynamic Flag module, a question generation module and a verification module;
the user request and response module is used for receiving a request of a user for accessing the title and returning the dynamically generated title to the user;
the dynamic Flag module is used for generating and storing dynamic Flag;
the title generation module is used for receiving the Flag generated by the dynamic Flag module and dynamically generating a corresponding title according to the received dynamic Flag;
and the verification module is used for comparing the dynamic Flag submitted by the user with the stored Flag and judging whether the dynamic Flag submitted by the user is correct or not and whether the dynamic Flag submitted by the user is cheated or not.
The title generation module comprises:
the text description type topic generating unit is used for receiving the dynamic Flag and dynamically generating a new topic text containing the dynamic Flag;
the accessory downloading type title generating unit is used for receiving the dynamic Flag, modifying the content of the original title according to the dynamic Flag, generating a new file and returning the downloading address of the new file to the user;
and the online environment type title generation unit is used for receiving the dynamic Flag and writing the dynamic Flag into the initialization script so as to realize the injection of the Flag into the online environment.
Has the advantages that: compared with the prior art, the method and the device dynamically generate different subjects containing different flags for each team/individual through the dynamic flags, can effectively reduce the behaviors of team members in interacting the flags and obtaining the flags of other people, enables the players to concentrate on the subjects, gives up the illusion of obtaining the flags from other non-problem solving ways, and can further discover possible cheating behaviors of the players so as to conveniently carry out operations of warning, shielding, releasing and the like on the cheating players.
Drawings
FIG. 1 is a flow chart of a method according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be purely exemplary and are not intended to limit the scope of the invention, as various equivalent modifications of the invention will occur to those skilled in the art upon reading the present disclosure and fall within the scope of the appended claims.
As shown in fig. 1, the dynamic Flag processing method for the CTF online competition platform disclosed in the embodiment of the present invention mainly includes three key mechanisms, namely, dynamic Flag generation, dynamic Flag distribution, and dynamic Flag verification submitted by a user, and specifically includes the following steps:
and (1) when a request of a user for visiting a question is received, generating and storing dynamic flags, wherein the dynamic flags generated when different users visit the same question and the same user visits different questions are different. In this step, when a user accesses a topic, a Flag specific to the topic of the user is generated uniformly by the XCTF training platform and stored in the database, the dynamic Flag may be a randomly generated character string with a certain length, or obtained by using an encryption algorithm according to the user and the related information of the topic, and a preferred method is to select a combined character string of the user ID, the topic ID and the timestamp and obtain the combined character string by using an irreversible encryption algorithm such as MD5, SHA1, and the like. And after uniformly generating the dynamic Flag by the platform, distributing the Flag to the title.
And (2) replacing the information in the original title with the dynamic Flag generated in the step (1), generating a new title and returning the new title to the user. In this step, after each specific topic receives the distributed dynamic Flag, a new Flag is injected into the original topic template, and the specific injection method is slightly different in implementation manners for different types of topics such as common text description types, accessory download types, and online environments of the CTF, and specifically as follows:
a. text description type topic
And after receiving the Flag distributed by the platform, the title generating process reads the original title text, updates the new Flag into the text, dynamically generates the text containing the dynamic Flag and returns the text to the user. The generated new topic text can be stored in a database, and the text can be directly returned when the topic is accessed again.
b. Accessory downloading question
And after receiving the Flag distributed by the platform, the title generating process loads the original title file needing to update the Flag, modifies the content of the original title according to the dynamic Flag, generates a new file and returns the download address of the new file to the user. For an executable file (such as a topic written in c language) needing to be compiled, modifying the content of a corresponding code file according to the dynamic Flag, and recompiling to generate a new executable file after modification, wherein the modified topic code is for some topics needing to be compiled. Or packaging one or more files to be downloaded and returning the download address of the compressed package to the user. The dynamically generated address of the new download file can also be stored in the database, and the saved attachment address can be directly returned when the title is accessed again.
c. On-line environment type topics
For topics of the online environment class, injecting Flag into the online environment is achieved by writing dynamic Flag into the initialization script before environment generation. After receiving the Flag distributed by the platform, the generation topic process modifies the Flag injection script content according to the dynamic Flag to generate a new Flag injection script, or transfers the dynamic Flag as a parameter to the Flag injection script, and then calls an environment deployment program to perform online environment deployment, and when the environment deployment is performed, the installation topic script is operated, and the dynamic Flag injection script is called to change the Flag value of the system. And returning the online environment access address to the user after the environment is deployed. Corresponding addresses are stored in the database during the period that the environment is not recovered, the user accesses the same environment for multiple times, related information in the database can be cleaned while the environment is recovered, the user applies for the title after the environment is recovered, and a new Flag and the environment can be generated again.
And (3) comparing the Flag submitted by the user with the Flag stored in the database when the Flag submitted by the user is received, judging whether the Flag submitted by the user is correct, further judging whether the user cheats if the Flag submitted by the user is incorrect, and considering that cheating exists between the two users if the Flag submitted by the user is the Flag of other users.
As shown in fig. 2, an apparatus based on the above dynamic Flag processing method for a CTF online competition platform disclosed in the embodiment of the present invention includes: the system comprises a user request and response module, a dynamic Flag module, a title generation module and a verification module. The user request and response module is used for receiving a request of a user for accessing a title and returning a dynamically generated title to the user; the dynamic Flag module is used for generating dynamic Flag and storing the dynamic Flag to the database; the title generation module is used for receiving the Flag generated by the dynamic Flag module and dynamically generating a corresponding title according to the received dynamic Flag; and the verification module is used for comparing the dynamic Flag submitted by the user with the stored Flag and judging whether the submission of the user is correct or not and whether the user cheats.
Wherein the topic generation module comprises: the text description type topic generating unit is used for receiving the dynamic Flag and dynamically generating a new topic text containing the dynamic Flag; the accessory downloading type title generating unit is used for receiving the dynamic Flag, modifying the content of the original title according to the dynamic Flag, generating a new file and returning the downloading address of the new file to the user; and the online environment type title generation unit is used for receiving the dynamic Flag and writing the dynamic Flag into the initialization script so as to realize the injection of the Flag into the online environment.
In an actual game, a theme and a corresponding dynamic Flag receiving program can be deployed first, and when a user accesses the theme environment in the game, the theme environment of each team/individual can be dynamically generated by adopting different schemes according to different theme types. The player acquires the Flag of other users/teams in the answering process through a non-answer way and submits the Flag to the system, the system can intelligently identify the cheating user, the platform can shield the user and two users provided with the Flag of the user by default for the cheating user, gives a warning, records the answer records of the player, and can cancel the shielding of the user and the user provided with the Flag under the permission of a host.
Claims (7)
1. A dynamic Flag processing method for a CTF online competition platform is characterized by comprising the following steps:
(1) when a request of a user for visiting a question target is received, generating and storing dynamic flags, wherein the dynamic flags generated when different users visit the same question and the same user visits different questions are different;
(2) replacing information in the original title with the dynamic Flag generated in the step (1), generating a new title and returning the new title to the user; wherein: for the text description type topics, replacing the texts in the original topics with dynamic flags, and dynamically generating new topic texts containing the dynamic flags; for the accessory downloading type questions, modifying the content of the original questions according to the dynamic Flag, generating a new file and returning the downloading address of the new file to the user; if the accessory downloading class topic is a compiled executable file, modifying the content of a corresponding code file according to the dynamic Flag, recompiling to generate a new executable file, and returning a downloading address to a user; for online environment type topics, injecting Flag into an online environment by writing dynamic Flag into an initialization script before environment generation;
(3) and when the Flag submitted by the user is received, comparing the Flag with the stored Flag, and judging whether the Flag submitted by the user is correct.
2. The dynamic Flag processing method for the CTF online competition platform according to claim 1, wherein when the files to be downloaded are a plurality of files, the files are packaged and the download addresses of the compressed packages are returned to the user.
3. The dynamic Flag processing method for the CTF online competition platform according to claim 1, wherein the initialization script of the online environment comprises a Flag injection script, and in the step (2), the content of the Flag injection script is modified according to the dynamic Flag to generate a new Flag injection script, or the dynamic Flag is used as a parameter to be transmitted to the Flag injection script, then an environment deployment program is called to perform online environment deployment, and the deployed online environment access address is returned to the user.
4. The dynamic Flag processing method for the CTF online competition platform as claimed in claim 1, wherein the dynamic Flag in step (1) is a randomly generated character string with a certain length, or a character string obtained by applying an irreversible encryption algorithm to the user information, the title information and the timestamp.
5. The CTF online competition platform dynamic Flag processing method according to claim 1, wherein in the step (3), if the Flag submitted by the user is incorrect, it is further determined whether the user cheats, and if the Flag submitted by the user is that of another user, it is determined that cheating behavior exists between the two users.
6. An apparatus based on the dynamic Flag processing method of the CTF online competition platform of any one of claims 1 to 5, comprising: the system comprises a user request and response module, a dynamic Flag module, a question generation module and a verification module;
the user request and response module is used for receiving a request of a user for accessing the title and returning the dynamically generated title to the user;
the dynamic Flag module is used for generating and storing dynamic Flag;
the title generation module is used for receiving the Flag generated by the dynamic Flag module and dynamically generating a corresponding title according to the received dynamic Flag;
and the verification module is used for comparing the Flag submitted by the user with the stored dynamic Flag and judging whether the submission of the user is correct or not and whether the user cheats or not.
7. The dynamic Flag processing device for the CTF online competition platform according to claim 6, wherein the title generation module comprises:
the text description type topic generating unit is used for receiving the dynamic Flag and dynamically generating a new topic text containing the dynamic Flag;
the accessory downloading type title generating unit is used for receiving the dynamic Flag, modifying the content of the original title according to the dynamic Flag, generating a new file and returning the downloading address of the new file to the user;
and the online environment type title generation unit is used for receiving the dynamic Flag and writing the dynamic Flag into the initialization script so as to realize the injection of the Flag into the online environment.
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| CN107596689B (en) * | 2017-09-07 | 2021-05-14 | 广州方硅信息技术有限公司 | Question-answering type interactive control method, device and system |
| CN108786115B (en) * | 2018-05-03 | 2021-06-01 | 南京赛宁信息技术有限公司 | Method and system for generating CTF dynamic Flag based on transparent proxy |
| CN109062659A (en) * | 2018-07-04 | 2018-12-21 | 广州大学 | A kind of generation method and its method for pushing of the anti-general CTF virtual machine of cheating |
| CN109543933B (en) * | 2018-10-08 | 2021-10-22 | 中国科学院信息工程研究所 | Network security personnel skill evaluation system |
| CN109714321A (en) * | 2018-12-14 | 2019-05-03 | 西安四叶草信息技术有限公司 | Dynamic flag processing method and processing device |
| CN109685347A (en) * | 2018-12-14 | 2019-04-26 | 西安四叶草信息技术有限公司 | Attacking and defending assessment method and device |
| CN111198683A (en) * | 2019-12-26 | 2020-05-26 | 曙光信息产业(北京)有限公司 | Internet platform |
| CN111209089B (en) * | 2020-02-28 | 2023-08-22 | 杭州师范大学 | CTF competition online environment class title safety deployment method |
| CN111756746B (en) * | 2020-06-24 | 2022-03-25 | 国家计算机网络与信息安全管理中心 | Network attack and defense competition dynamic Flag anti-cheating application method |
| CN111881157A (en) * | 2020-07-29 | 2020-11-03 | 光通天下网络科技股份有限公司 | Network target range cheating behavior detection method and device and electronic equipment |
| CN112885175B (en) * | 2021-01-15 | 2022-10-21 | 杭州安恒信息安全技术有限公司 | Information security question generation method and device, electronic device and storage medium |
| CN113342479B (en) * | 2021-08-09 | 2021-11-26 | 南京赛宁信息技术有限公司 | Competition platform dynamic Flag injection method and system based on file system |
| CN116070115A (en) * | 2023-01-05 | 2023-05-05 | 北京永信至诚科技股份有限公司 | Cheating determination method and device in network attack and defense competition |
| CN116248411B (en) * | 2023-03-21 | 2024-02-23 | 广西塔易信息技术有限公司 | AWD attacks and defends platform |
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| CN104537924B (en) * | 2015-01-26 | 2017-08-29 | 中国科学技术大学 | A kind of information security attacking and defending tutoring system based on cloud platform |
| CN106254547A (en) * | 2016-09-29 | 2016-12-21 | 北京理工大学 | A kind of network security technology contest dynamic FLAG management method |
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