Difference between revisions of "COM settings in OPC Classic client components"

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(Created page with "Category:Troubleshooting CoInitializeSecurity parameters: * Without TurnOffCallSecurity: dwAuthnLevel = RPC_C_AUTHN_LEVEL_CONNECT (2), dwImpLevel = RPC_C_IMP_LEVEL_IMPERSO...")
 
 
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[[Category:Troubleshooting]]
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[[Category:COM/DCOM]] [[Category:Troubleshooting]]
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This article describes the internal effects of the UseCustomSecurity, TurnOffCallSecurity and TurnOffActivationSecurity settings.
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COM and proxy initialization:
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* Without UseCustomSecurity: CoInitializeSecurity is not called, CoSetProxyBlanket is not called
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* With UseCustomSecurity (the default): CoInitializeSecurity is called, CoSetProxyBlanket is called
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CoInitializeSecurity parameters:
 
CoInitializeSecurity parameters:
* Without TurnOffCallSecurity: dwAuthnLevel = RPC_C_AUTHN_LEVEL_CONNECT (2), dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3), pSecDesc = <by CSecurityDescriptor::InitializeFromThreadToken()>
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* Without TurnOffCallSecurity (the default): dwAuthnLevel = RPC_C_AUTHN_LEVEL_CONNECT (2); dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3); pSecDesc = <by CSecurityDescriptor::InitializeFromThreadToken()>
* With TurnOffCallSecurity: dwAuthnLevel = RPC_C_AUTHN_LEVEL_NONE (1), dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3), pSecDesc = NULL
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* With TurnOffCallSecurity: dwAuthnLevel = RPC_C_AUTHN_LEVEL_NONE (1); dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3); pSecDesc = NULL
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CoSetProxyBlanket parameters: dwAuthnLevel and dwImpLevel are the same as those used with CoInitializeSecurity.
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COAUTHINFO* pAuthInfo in COSERVERINFO* passed to CoCreateInstanceEx (when machine name is not empty):
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* Without TurnOffActivationSecurity (the default): dwAuthnSvc = RPC_C_AUTHN_NONE; dwAuthzSvc = RPC_C_AUTHZ_NONE; pwszServerPrincName = NULL; dwAuthnLevel = RPC_C_AUTHN_LEVEL_NONE; dwImpersonationLevel = RPC_C_IMP_LEVEL_IMPERSONATE; pAuthIdentityData = NULL; dwCapabilities = EOAC_NONE;
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* With TurnOffActivationSecurity: NULL
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(see https://docs.microsoft.com/en-us/windows/win32/com/turning-off-activation-security?redirectedfrom=MSDN)

Latest revision as of 16:31, 20 October 2021

This article describes the internal effects of the UseCustomSecurity, TurnOffCallSecurity and TurnOffActivationSecurity settings.

COM and proxy initialization:

  • Without UseCustomSecurity: CoInitializeSecurity is not called, CoSetProxyBlanket is not called
  • With UseCustomSecurity (the default): CoInitializeSecurity is called, CoSetProxyBlanket is called

CoInitializeSecurity parameters:

  • Without TurnOffCallSecurity (the default): dwAuthnLevel = RPC_C_AUTHN_LEVEL_CONNECT (2); dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3); pSecDesc = <by CSecurityDescriptor::InitializeFromThreadToken()>
  • With TurnOffCallSecurity: dwAuthnLevel = RPC_C_AUTHN_LEVEL_NONE (1); dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3); pSecDesc = NULL

CoSetProxyBlanket parameters: dwAuthnLevel and dwImpLevel are the same as those used with CoInitializeSecurity.

COAUTHINFO* pAuthInfo in COSERVERINFO* passed to CoCreateInstanceEx (when machine name is not empty):

  • Without TurnOffActivationSecurity (the default): dwAuthnSvc = RPC_C_AUTHN_NONE; dwAuthzSvc = RPC_C_AUTHZ_NONE; pwszServerPrincName = NULL; dwAuthnLevel = RPC_C_AUTHN_LEVEL_NONE; dwImpersonationLevel = RPC_C_IMP_LEVEL_IMPERSONATE; pAuthIdentityData = NULL; dwCapabilities = EOAC_NONE;
  • With TurnOffActivationSecurity: NULL

(see https://docs.microsoft.com/en-us/windows/win32/com/turning-off-activation-security?redirectedfrom=MSDN)