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x509_cmp_timeframe

API Overview​

X509_cmp_timeframe is an API in openssl. This rule belongs to the return value check type. This rule is generated using AURC.

Rule Description​

tip

X509_cmp_timeframe() returns 0 if B<vpm> is not NULL and the verification parameters do not contain B<X509_V_FLAG_USE_CHECK_TIME> but do contain B<X509_V_FLAG_NO_CHECK_TIME>. Otherwise it returns 1 if the end time is not NULL and the reference time (which has determined as stated above) is past the end time, -1 if the start time is not NULL and the reference time is before, else 0 to indicate that the reference time is in range (implying that the end time is not before the start time if both are present).

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("X509_cmp_timeframe")
  }
}

from OpenSSLFunctionCall call, UnaryOperation uop
where
  uop.getOperator() = "!" and
  uop.getOperand() = call.getAnAccess()
select uop, "This negation checks the return value of X509_cmp_timeframe."