I want to collect performance data from a Windows 2008 R2 Server with PowerShell.
For this task, I want to use a non admin account.
My problem is now, that I´m getting back a empty object ($WMIService).
There is no error message when I´m executing my script.
When I´m using a account with admin rights, everything is perfect.
So I think, permissions are missing for the non admin account.
How can I fix my problem?
My configuration for the WMIService account:
Enable remote WMI requests technet
Enable DCOM calls msdn
My script:
$ServiceCred = Get-Credential
$AdminCred= Get-Credential
$WMIService = Get-WmiObject -Class Win32_PerfFormattedData_PerfOS_Memory -ComputerName servername -Credential $ServiceCred
$WMIAdmin = Get-WmiObject -Class Win32_PerfFormattedData_PerfOS_Memory -ComputerName servername -Credential $AdminCred
$WMIService (Empty)
$WMIAdmin (Perfect)
You should set the appropriate permissions for your non admin account.
Solved! The user must also be in the Performance Monitor Users group.
My working configuartion:
Enable remote WMI requests technet
Enable DCOM calls msdn
Added account to the Performance Monitor Users group
Take a look a this guide, it may help. Make sure you enabled Remote Enable on your user configuration.
Related
I want to build a script to change and/or set up BIOS password to HP workstations.
Script i run as follows:
C:\> $computers=Get-Content -Path c:\computers.txt
C:\> foreach ($computer in $computers) {
$passChange=Get-WmiObject -computername $computer -Namespace root/hp/instrumentedBIOS -Class HP_BIOSSettingInterface
$passChange.SetBIOSSetting('Setup Password','<utf-16/>MYNEWPASSWORD','<utf-16/>')
}
Now, the following happen:
If my BIOS has no password, the script works just fine!
If my BIOS has password already, script has Return: 6. I suppose there is
a different option for changing the BIOS password?If yes, any help
is appreciated!
If i run the script for my computer, it works.
If i run the script for another computer i get the following error:
The RPC server is unavailable. (Exception from HRESULT: 0x800706BA).
Is there a way to enable an option to enable the RPC for this feature and then disable it again?
Thank you in advance
According to HP's documentation HP Client Management Interface the WMI interface supports remote interfacing.
You need to ensure all remote computers you're attempting to connect to have the HP custom WMI Namespace.
You also need to ensure the account you're running under has administrative permissions on all of the remote computers.
You may also need to explicitly set the impersonation to 3 which is impersonate.
For more information: Connecting to WMI Remotely with PowerShell
Also ensure the firewall on the remote computers is either off or has exclusions for WMI
I am receiving an access denied error when attempting to use the following to query a service on a Windows 2012 server:
get-wmiobject -Class Win32_Service -comp 192.168.60.23 -cred lab\test -filter "name='tapisrv'"
If I use an account that is a domain admin for the -cred parameter, then of course everything works fine. However, using the test account I can't seem to make it work. Here are the things I have tried so far:
Added test account to WinRMRemoteWMIUsers__ and Distributed COM users group
Ensured Distributed COM group is added in dcomcnfg ->Component Services -> My Computer -> properties ->COM Security ->Launch and Activate Permissions
Added test account to WMIMGMT.msc -> WMI Control -> Properties -> Security -> Root -> Security
Most of the troubleshooting steps have come from here:
"get-wmiobject win32_process -computername" gets error "Access denied , code 0x80070005"
Only way I can seem to get the test user to work is make him a local admin, which I do not want to do. Is there any configuration I am overlooking in order to make this work?
Thanks
Ok, so it was obscure and I found it in the following post:
Granting remote user (non admin) the ability to enumerate services in Win32_Service in namespace cimv2 using WMI & C#
sc sdset SCMANAGER D:(A;;CCLCRPRC;;;AU)(A;;CCLCRPWPRC;;;SY)(A;;KA;;;BA)S:(AU;FA;KA;;;WD)(AU;OIIOFA;GA;;;WD)
I appreciate those trying to help!
I have a non-admin access to a server. I'm allowed to connect via RDP, and to use PowerShell remoting. When I invoke the following PowerShell command from an RDP session:
Get-WinEvent -MaxEvents 100 -Provider Microsoft-Windows-TaskScheduler
I get 100 records, as expected.
When I do the same via PowerShell remoting, by invoking the following from my local machine:
invoke-command -ComputerName myserver {Get-WinEvent -MaxEvents 100 -Provider Microsoft-Windows-TaskScheduler }
I get an error:
No events were found that match the specified selection criteria.
CategoryInfo : ObjectNotFound: (:) [Get-WinEvent], Exception
FullyQualifiedErrorId : NoMatchingEventsFound,Microsoft.PowerShell.Commands.GetWinEventCommand
Any idea why? The remote PowerShell session should be running under identical credentials, right?
EDIT: whoami does show a difference in the security context between RDP logon and PowerShell remoting - the group set is different. In the RDP logon session, there are the following groups in the token:
BUILTIN\Remote Desktop Users
NT AUTHORITY\REMOTE INTERACTIVE LOGON
while in the remoted one, there's
CONSOLE LOGON
That could account for the discrepancy in rights...
EDIT: from the registry, it looks like the task scheduler log somehow is a part of the System log. According to MS KB article Q323076, the security descriptor for the System log can be found under HKLM\SYSTEM\CurrentControlSet\Services\EventLog\System, value CustomSD. I can't check the server in question, but on another server where I'm an admin, there's no CustomSD under that key. Under HKLM\SYSTEM\CurrentControlSet\Services\EventLog\System\Microsoft-Windows-TaskScheduler, neither. Only the Security log gets a CustomSD. The next question is, where's the default SD?
Permissions on the actual log file at C:\Windows\System32\winevt\LogsMicrosoft-Windows-TaskScheduler%4Operational.evtx are irrelevant, the access is being mediated by the EventLog service anyway.
If you are not an administrator on the remote computer, and invoke-command -ComputerName myserver {whoami /all} tells you are who you expected to be.
You will need to be part of Event Log Reader group on the remote computer.
As well as Remote Management Users group, which I believe you already are.
If you need to read security logs, you will also need Manage auditing and security log under Local Security Policy -> Security Settings -> Local Policies -> User Rights Assignment
According to Default ACLs on Windows Event Logs # MSDN blog, in Windows Server 2003+, the default ACL for the System log goes:
O:BAG:SYD:
*(D;;0xf0007;;;AN) // (Deny) Anonymous:All Access
*(D;;0xf0007;;;BG) // (Deny) Guests:All Access
(A;;0xf0007;;;SY) // LocalSystem:Full
(A;;0x7;;;BA) // Administrators:Read,Write,Clear
(A;;0x5;;;SO) // Server Operators:Read,Clear
(A;;0x1;;;IU) // INTERACTIVE LOGON:Read <===================
(A;;0x1;;;SU) // SERVICES LOGON:Read
(A;;0x1;;;S-1-5-3) // BATCH LOGON:Read
(A;;0x2;;;LS) // LocalService:Write
(A;;0x2;;;NS) // NetworkService:Write
Does NT AUTHORITY\INTERACTIVE LOGON include RDP logon? I've found a forum message that says so, but I'd better find a doc to that effect...
The article claims this ACE comes "straight from the source code". So it's hard-coded in the service, with a chance to change via the registry.
You need local admin rights to open a powershell session.
But there is a workaround/alterative here:
https://4sysops.com/archives/powershell-remoting-without-administrator-rights/
I had the weirdest variation of this problem, was driving me nuts !
Remoting from a server W2008r2 (logged on as domain admin, inside interactive powershell session) to workstation Win7 to get logon/logoff events :
invoke-command -computername $pc {Get-WinEvent -FilterHashtable #{logname='
Security';Id=#(4624,4634)}}
-> No events were found that match the specified selection criteria.
But it does work when outputting an empty string in the scriptblock before the Get-Winevent :
invoke-command -computername $pc {"";Get-WinEvent -FilterHashtable #{lognam
e='Security';Id=#(4624,4634)}}
TimeCreated ProviderName Id Message PSComputerName
----------- ------------ -- ------- --------------
19/03/2018 11:51:41 Microsoft-Windows-Se... 4624 An account was succe... b25_x64
19/03/2018 11:51:41 Microsoft-Windows-Se... 4624 An account was succe... b25_x64
Stumbled upon this fix after trying everything: Enter-Pssession, New-Pssession, using -credential parameter to pass a predefined credential to invoke-command, to get-winevent, to both. Nothing worked, gave "No events..." in every combination.
Then I inserted a $cred inside the scriptblock to show the passed on credential for debugging, and suddenly I got the events I was looking for...
i often use the New-MailboxExportRequest 's command on an exchange server in powershell console, like this one :
Add-PSSnapin Microsoft.Exchange.Management.PowerShell.E2010;
New-MailboxExportRequest -Mailbox jadrego –filepath \\computer1\c$\test.pst -verbose
it works correctly. But if I run those commands in PS remote session like this one :
I use the same User (Domain Admin, Exchange Admin)
Invoke-Command -ComputerName vdiv03 -ScriptBlock {
Add-PSSnapin Microsoft.Exchange.Management.PowerShell.E2010;
New-MailboxExportRequest -Mailbox jadrego –filepath \\computer1\c$\test.pst
}
I obtain this error :
failed to comunicate with mailbox database
with -verbose
Loading the snapin like that isn't supported in Exchange 2010.
IMHO, you'd be much better off just leveraging the native remoting built into Exchange for management tasks.
$ExchangeServer = <exchange serer name>
$SessionParams =
#{
ConfigurationName = 'Microsoft.Exchange'
ConnectionURI = "http://$ExchangeServer/powershell/"
Authentication = 'Kerberos'
# Credential = $Creds
}
$Session = New-PSSession #SessionParams
Invoke-command -ScriptBlock {New-MailboxExportRequest -Mailbox jadrego –filepath \\computer1\c$\test.pst} -Session $Session
Remove-PSSession $Session
Set $ExchangeServer to the name of one of your Exchange 2010 servers. The account will need to be a member of the necessary RBAC role for the function you're performing, and you can uncomment the Credential parameter and provide alternate credentials for the session if you need to.
This will also elimnatat the need to have the management tools installed on the computer that's running the script, and the associated headaches of keeping it patched to the same level as what's on the servers.
If you're working interactively, or running a script that uses many Exchange cmdlets you can add the session creation to your profile, and do an Import-PSSession and you'll have proxy functions for the Exchange cmdlets available locally that you can use the same as if you'd loaded the snapin.
Import-PSSsession $Session
Some caveates to be aware of:
When you use implicit remoting like this, the account of the credentiaals used to establish the session will determine what capablilities you will have. What appear to be Exchange cmdlets added to the local session are actually proxy functions ( you can verify this using Get-Command). This set of proxy functions is created dynamically by Exchange when you initially establish the session and will be customized according to the RBAC roles the account making the connection belongs to. If it doesn't have permissions to perform given functions you will not get the proxy functions for those cmdlets, or functions may not have parameters for those functions.
The results you get back will not be the same as the same as the native objects returned if you used an EMS shell, or loaded the snapin. They will be deserialized objects, which means they may be missing methods and will lose some fidelity compared to the native objects. There will be very few instances where this will be an issue, or cannot by worked around.
Also be aware that when you use implicit remoting, updates are made under the authority of an Exchange system account, not your credentials. When you use the snapin, your account must have permission to update the Exchange properties stored in AD directly, and those changes will be logged in Windows audit logs (if enabled) as having been made by that account. When you use implicit remoting they will be recorded as being done by the Exchange service account. Exchange will record the details of the actual user account that made the request in it's admin audit log, and you can use Search-AdminAuditLog to find out when changes were made, and by who even if Windows audit logging is not enabled. If you use the snapin directly and do not have AD audit logging enabled you will lose that audit trail.
I have Powershell script that makes backups of all Event logs on current localhost.
It runs from Task Scheduler with "Run with highest privileges" under restricted account (this account only has Backup Operator rights). Script itself can be found here
OS: Windows Server 2008 R2, UAC is turned off.
The problem appears in the following line:
$Eventlogs = Get-WmiObject -Class Win32_NTEventLogFile -ComputerName $computer
In returned collection of Event logs Security log is missing and as result isn`t backuped. All other are present.
If the same script is run directly from Powershell using the same account - Security log is present.
Granting local Admin rights to account solves the issue but isn`t applicable.
Do you have any ideas what may be causing such behaviour? Appreciate any help!
I have not done a lot of research on this but I once encountered a similar problem. Using the switch -EnableAllPrivileges in the first call of get-WmiObject solved it for me.