Graph/34668cf9-5381-45a1-8d8a-7d9bca213070

Domainunvalidated

Security Barrier

34668cf9-5381-45a1-8d8a-7d9bca213070

Security Barrier

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Updated5/1/2026

PageRank0.0001

Effectiveness0.000

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26 linked nodes

PERTAIN_TOProblem

SET current_user = 123 — once returned to connection pool.

PERTAIN_TOSolution

set_config('somenamespace.current_user', 123, true). Tension: This raises the following complexities: It significantly increases amount of code required on a backend. Outcome: Different endpoints in your app can operate under different roles with adequate defaults already in place.

PERTAIN_TOSolution

More complex, multi-statement queries, or things like `insert..on conflict` and `merge`.

PERTAIN_TOProblem

tx.Begin + tx.Commit + tx.Rollback + set_config + core query — on each query you must write something like `set_config('')` or `SET LOCAL` first. Tension: It significantly increases amount of code required on a backend. Outcome: just query.

PERTAIN_TOSolution

Some manuals suggest mitigation by prepending `SET LOC — per connection - once returned to connection pool. Outcome: mitigation by prepending `SET LOC.

PERTAIN_TORootCause

my own testing code runs in the same program as the student code. Outcome: A general-purpose multiuser operating system segregates the memory of different processes.

PERTAIN_TOProblem

the students are still able to guess the correct file descriptor of stdout and write to it. Tension: this is not secure as a student can do `int student_function(int foo) { printf("OK"); exit(1) }` and pass all tests. Outcome: would it make sense to fork the process, and use some magic based on seccomp etc?

PERTAIN_TOSolution

Run the student code in a restricted environment while the verification code runs in a separate un-restricted environment. Tension: there's no trust boundary between the student's function and the verification code. Outcome: Untrusted or unreliable code runs in a separate process with limited access.

PERTAIN_TOProblem

Is possible to call cl:open by another way? — I need to hide dungerous function(s), for example, cl:open for thirdparty code downloaded from internet. Outcome: There will be more.

PERTAIN_TOSolution

Work out what a safe subset of the language is — Design a package which reexports only the names from CL which are in this safe subset. Tension: there are snares everywhere. Outcome: Design a safe reader. This should at least prevent read-time evaluation.

PERTAIN_TOProblem

the styles file is redirected to http://localhost:8080/login — I use bootstrap styles and styles written by me personally in the css file. Tension: some of the styles in my spring project stopped working. Outcome: the styles started working.

PERTAIN_TOSolution

You need to tell Spring Security to ignore resources under src/main/resources/static. — adding `http.authorizeRequests((requests) -> requests. .requestMatchers(PathRequest.toStaticResources().atCommonLocations()).permitAll()) ` to your security config. Tension: remove all the `"/static/...` references from your existing configuration. Outcome: adding `http.authorizeRequests((requests) -> requests. .requestMatchers(PathRequest.toStaticResources().atCommonLocations()).permitAll()) `.

PERTAIN_TOProblem

The tutorial’s Spring Security configuration extends the deprecated WebSecurityConfigurerAdapter, and the user also encounters deprecation/incorrect method usage for security DSL calls like authorizeHttpRequest/authorizeRequest, antMatchers, and requestMatchers.

PERTAIN_TOSolution

Refactor the configuration to define a @Bean SecurityFilterChain (and relevant Authentication setup) instead of extending WebSecurityConfigurerAdapter, using the current HttpSecurity DSL such as authorizeHttpRequests with requestMatchers and anyRequest().authenticated(), plus formLogin/logout configuration.

PERTAIN_TOProblem

All routes except /login redirect back to /login

PERTAIN_TOProblem

Parameter 0 of method securityFilterChain required a bean of type 'org.springframework.security.' that could not be found — I am using spring boot microservice (spring boot version -3). Tension: Its on Gateway server.

PERTAIN_TOSolution

add `@EnableWebSecurity` annotation on your `SecurityConfig` class level — You will have something like this:. Tension: it is required because:. Outcome: `@EnableWebSecurity` is a marker annotation.

PERTAIN_TOProblem

jwtAuthFilter was triggered for /api/auth/login even with permitAll() and anyRequest().permitAll()

PERTAIN_TOSolution

jwtAuthFilter was triggered. — i sent a request by Post man on "localhost:8085/api/auth/login". Outcome: OncePerRequestFilter has shouldNotFilter method to avoid filtering for some requests.

PERTAIN_TOProblem

Application startup fails because Spring cannot find a required bean of type org.springframework.security.core.userdetails.UserDetailsService for the AuthenticationManager configuration.

PERTAIN_TOSolution

Define and register a UserDetailsService bean (e.g., an InMemoryUserDetailsManager) in the configuration so it can be injected into authManager.

PERTAIN_TORootCause

Protection relies on application isolation levels and protected memory access; bypassing them lets protected data be read directly from RAM

PERTAIN_TOProblem

admin password security mechanism in PDFs

PERTAIN_TOSolution

Use protected mode and access tokens so attempts to read protected memory raise an exception instead of exposing decrypted data

PERTAIN_TOProblem

Application fails to start when creating the authorizationServerSecurityFilterChain, throwing an exception about missing/incorrect org/springframework/security/web/authentication/DelegatingAuthenticationConverter after migrating Spring Authorization Server from 1.2 to 1.4.

PERTAIN_TOSolution

Align all Spring Boot/Spring Security/Authorization Server dependency versions (e.g., upgrade the Spring Boot plugin to the same version and remove hardcoded version overrides), and prefer using org.springframework.boot:spring-boot-starter-oauth2-authorization-server so transitive dependencies match.

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