Difference between revisions of "COM settings in OPC Classic client components"
| Line 7: | Line 7: | ||
'''COM and proxy initialization:''' | '''COM and proxy initialization:''' | ||
| − | * Without UseCustomSecurity: CoInitializeSecurity is not called. CoSetProxyBlanket is not called. | + | * Without UseCustomSecurity: CoInitializeSecurity is not called. IClientSecurity::SetBlanket (or CoSetProxyBlanket) is not called. |
| − | * With UseCustomSecurity (the default): CoInitializeSecurity is called. CoSetProxyBlanket is called (only in NativeClient). | + | * With UseCustomSecurity (the default): CoInitializeSecurity is called. IClientSecurity::SetBlanket (or CoSetProxyBlanket) is called (only in NativeClient). |
'''CoInitializeSecurity parameters:''' | '''CoInitializeSecurity parameters:''' | ||
| Line 22: | Line 22: | ||
AccessFromThreadToken is ignored. | AccessFromThreadToken is ignored. | ||
| − | '''CoSetProxyBlanket parameters''': | + | '''IClientSecurity::SetBlanket (or CoSetProxyBlanket) parameters''': |
dwAuthnLevel and dwImpLevel are the same as those used with CoInitializeSecurity. | dwAuthnLevel and dwImpLevel are the same as those used with CoInitializeSecurity. | ||
| Line 43: | Line 43: | ||
CoInitializeSecurity is not called. | CoInitializeSecurity is not called. | ||
| − | * Without UseCustomSecurity: CoSetProxyBlanket is not called. | + | * Without UseCustomSecurity: IClientSecurity::SetBlanket (or CoSetProxyBlanket) is not called. |
| − | * With UseCustomSecurity (the default): CoSetProxyBlanket is called. | + | * With UseCustomSecurity (the default): IClientSecurity::SetBlanket (or CoSetProxyBlanket) is called. |
| − | '''CoSetProxyBlanket parameters''': | + | '''IClientSecurity::SetBlanket (or CoSetProxyBlanket) parameters''': |
* Without TurnOffCallSecurity (the default): dwAuthnLevel = Always RPC_C_AUTHN_LEVEL_CONNECT (2); dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3). | * Without TurnOffCallSecurity (the default): dwAuthnLevel = Always RPC_C_AUTHN_LEVEL_CONNECT (2); dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3). | ||
* With TurnOffCallSecurity: dwAuthnLevel = RPC_C_AUTHN_LEVEL_NONE (1); dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3).<ref name="TurnOffCallSecurity">See [https://docs.microsoft.com/en-us/windows/win32/com/turning-off-call-security Turning Off Call Security]. For this to work, the server must also specify None for its authentication level.</ref> | * With TurnOffCallSecurity: dwAuthnLevel = RPC_C_AUTHN_LEVEL_NONE (1); dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3).<ref name="TurnOffCallSecurity">See [https://docs.microsoft.com/en-us/windows/win32/com/turning-off-call-security Turning Off Call Security]. For this to work, the server must also specify None for its authentication level.</ref> | ||
Revision as of 18:54, 27 January 2022
This article describes the internal effects of the various COM security settings.
QuickOPC version 2022.1 and later
Parameters from EasyXXClient.SharedParameters.EngineParameters.ComSecurityParameters are used for COM security initialization. Parameters from EasyXXClient.SharedParameters.MachineParameters.ComInstantiationParameters are used for operations on OPCEnum. Parameters from EasyXXClient.SharedParameters.ClientParameters.ComInstantiationParameters are used for operations on target OPC servers.
COM and proxy initialization:
- Without UseCustomSecurity: CoInitializeSecurity is not called. IClientSecurity::SetBlanket (or CoSetProxyBlanket) is not called.
- With UseCustomSecurity (the default): CoInitializeSecurity is called. IClientSecurity::SetBlanket (or CoSetProxyBlanket) is called (only in NativeClient).
CoInitializeSecurity parameters:
pSecDesc = NULL.
- Without AllowImpersonateClient (the default): dwImpLevel = RPC_C_IMP_LEVEL_IDENTIFY (2).
- With AllowImpersonateClient: dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3).
- Without TurnOffCallSecurity (the default): dwAuthnLevel = Common authentication level (see below).
- With TurnOffCallSecurity: dwAuthnLevel = RPC_C_AUTHN_LEVEL_NONE (1).[1]
AccessFromThreadToken is ignored.
IClientSecurity::SetBlanket (or 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): NULL.
- With TurnOffActivationSecurity: 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.[2]
Common authentication level:
- Without EnsureDataIntegrity (the default): RPC_C_AUTHN_LEVEL_CONNECT (2).
- With EnsureDataIntegrity: RPC_C_AUTHN_LEVEL_PKT_INTEGRITY (5).[3]
QuickOPC versions up to 2021.3
The information only applies to NativeClient implementation. The NetApiClient implementation uses different settings, and they cannot be changed by the parameters described here.
For operations on OPCEnum, parameters from EasyXXClient.SharedParameters.MachineParameters are used. For operations on target OPC servers, parameters from EasyXXClient.SharedParameters.ClientParameters are used.
COM and proxy initialization:
CoInitializeSecurity is not called.
- Without UseCustomSecurity: IClientSecurity::SetBlanket (or CoSetProxyBlanket) is not called.
- With UseCustomSecurity (the default): IClientSecurity::SetBlanket (or CoSetProxyBlanket) is called.
IClientSecurity::SetBlanket (or CoSetProxyBlanket) parameters:
- Without TurnOffCallSecurity (the default): dwAuthnLevel = Always RPC_C_AUTHN_LEVEL_CONNECT (2); dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3).
- With TurnOffCallSecurity: dwAuthnLevel = RPC_C_AUTHN_LEVEL_NONE (1); dwImpLevel = RPC_C_IMP_LEVEL_IMPERSONATE (3).[1]
COAUTHINFO* pAuthInfo in COSERVERINFO* passed to CoCreateInstanceEx (when machine name is not empty):
- Without TurnOffActivationSecurity (the default): NULL.
- With TurnOffActivationSecurity: 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.[2].
- ↑ 1.0 1.1 See Turning Off Call Security. For this to work, the server must also specify None for its authentication level.
- ↑ 2.0 2.1 See Turning Off Activation Security. For this to work, the server must specify Everyone for Default Launch Permissions.
- ↑ For KB5004442—Manage changes for Windows DCOM Server Security Feature Bypass (CVE-2021-26414).
