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ocsp_check_nonce

API Overview​

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

Rule Description​

tip

OCSP_check_nonce() returns the result of the nonce comparison between B<req> and B<resp>. The return value indicates the result of the comparison. If nonces are present and equal 1 is returned. If the nonces are absent 2 is returned. If a nonce is present in the response only 3 is returned. If nonces are present and unequal 0 is returned. If the nonce is present in the request only then -1 is returned.

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("OCSP_check_nonce")
  }
}

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