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Kerberos: GSS_Passive. Handle bad SPN case #4775

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Merged
gpotter2 merged 1 commit into from
Jun 25, 2025
Merged

Kerberos: GSS_Passive. Handle bad SPN case #4775

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11 changes: 9 additions & 2 deletions scapy/layers/kerberos.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4039,6 +4039,7 @@ class STATE(SSP.STATE):
CLI_SENT_APREQ = 3
CLI_RCVD_APREP = 4
SRV_SENT_APREP = 5
FAILED = -1

class CONTEXT(SSP.CONTEXT):
__slots__ = [
Expand Down Expand Up @@ -4982,12 +4983,18 @@ def GSS_Passive(self, Context: CONTEXT, token=None):

if Context.state == self.STATE.INIT:
Context, _, status = self.GSS_Accept_sec_context(Context, token)
Context.state = self.STATE.CLI_SENT_APREQ
return Context, GSS_S_CONTINUE_NEEDED
if status == GSS_S_CONTINUE_NEEDED:
Context.state = self.STATE.CLI_SENT_APREQ
else:
Context.state = self.STATE.FAILED
return Context, status
elif Context.state == self.STATE.CLI_SENT_APREQ:
Context, _, status = self.GSS_Init_sec_context(Context, token)
return Context, status

# Unknown state. Don't crash though.
return Context, GSS_S_FAILURE

def GSS_Passive_set_Direction(self, Context: CONTEXT, IsAcceptor=False):
if Context.IsAcceptor is not IsAcceptor:
return
Expand Down
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