CIFSSEC_MUST_KRB5
if ((*flags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
*flags = CIFSSEC_MUST_KRB5;
#define CIFSSEC_MAX (CIFSSEC_MAY_SIGN | CIFSSEC_MUST_KRB5 | CIFSSEC_MAY_SEAL)