COM settings in OPC Classic client components: Difference between revisions
From OPC Labs Knowledge Base
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'''CoInitializeSecurity parameters:''' | '''CoInitializeSecurity parameters:''' | ||
* Without TurnOffCallSecurity (the default): dwAuthnLevel = | * Without TurnOffCallSecurity (the default): dwAuthnLevel = Common authentication level (see below); dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3); pSecDesc = CSecurityDescriptor::InitializeFromThreadToken()> | ||
* With TurnOffCallSecurity: dwAuthnLevel = RPC_C_AUTHN_LEVEL_NONE (1); dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3); pSecDesc = NULL | * With TurnOffCallSecurity: dwAuthnLevel = RPC_C_AUTHN_LEVEL_NONE (1); dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3); pSecDesc = NULL | ||
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* With TurnOffActivationSecurity: NULL | * With TurnOffActivationSecurity: NULL | ||
(see https://docs.microsoft.com/en-us/windows/win32/com/turning-off-activation-security?redirectedfrom=MSDN) | (see https://docs.microsoft.com/en-us/windows/win32/com/turning-off-activation-security?redirectedfrom=MSDN) | ||
'''Common authentication level:''' RPC_C_AUTHN_LEVEL_CONNECT (2). | |||
Revision as of 17:20, 26 January 2022
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 = Common authentication level (see below); dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3); pSecDesc = 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
Common authentication level: RPC_C_AUTHN_LEVEL_CONNECT (2).
