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x509v3_get_ext_by_critical

API Overview​

X509v3_get_ext_by_critical is an API in openssl. This rule belongs to the return value check type. This rule is generated using AURC.

Rule Description​

tip

X509v3_get_ext_by_NID() X509v3_get_ext_by_OBJ() and X509v3_get_ext_by_critical() return the an extension index or B<-1> if an error occurs.

info
  • Tags: return value check
  • Parameter Index: N/A
  • CWE Type: CWE-253

Rule Code​

import cpp

class OpenSSLFunctionCall extends FunctionCall {
  OpenSSLFunctionCall() {
    this.getTarget().hasName("X509v3_get_ext_by_critical")
  }
}

from OpenSSLFunctionCall call, UnaryOperation uop
where
  uop.getOperator() = "!" and
  uop.getOperand() = call.getAnAccess()
select uop, "This negation checks the return value of X509v3_get_ext_by_critical."