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Setting a users logon hours

By default a user can logon 24/7.  Is this acceptable – should users be able to logon during the night or weekends. AD Users and Computers has a GUI to set the hours users can logon. But we don’t need a GUI we can do this

if (-not (Get-Module ActiveDirectory)){            
  Import-Module ActiveDirectory            
$ou = "OU=England,DC=Manticore,DC=org"            
## allow logon 8am - 6pm Monday to Friday            
[byte[]]$hours = @(0,0,0,0,255,3,0,255,3,0,255,3,0,255,3,0,255,3,0,0,0)            
$name = "UserA"            
Get-ADUser -Identity $name |            
Set-ADUser -Replace @{logonhours = $hours}            
"`nAD provider"            
$name = "UserB"            
$dn = "cn=$name,$ou"            
Set-ItemProperty -Path AD:\$dn  -Name logonhours -Value $hours -Force            
$name = "UserC"            
Get-QADUser -Identity $name |            
Set-QADUser -ObjectAttributes @{logonhours = $hours}            
$name = "UserD"            
$dn = "cn=$name,$ou"            
$user = [adsi]"LDAP://$dn"            
$user.logonhours[0] = $hours            

We’ll use the four test users we created earlier in the England OU.

The important point is how we represent the hours users can logon.

The information is stored as a byte array – 3bytes per day with 1 bit per hour

We want to restrict the users to 8am-6pm Monday to Friday so we use

[byte[]]$hours = @(0,0,0,0,255,3,0,255,3,0,255,3,0,255,3,0,255,3,0,0,0)

Sunday is the start of the week – no logons allowed so first three bytes are 0. Monday’s three bytes starts with a 0 as don’t want logons between midnight and 8am. The 8 hours of logons followed by two hours. etc

A few other examples might help

Deny all logon

[byte[]]$hours = @(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0)


Allow logon at all hours

[byte[]]$hours = @(255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255)


Allow 8am-6pm – 7 days a week

[byte[]]$hours = @(0,255,3,0,255,3,0,255,3,0,255,3,0,255,3,0,255,3,0,255,3)


If you are in doubt about generating the array – set in the GUI then copy the values using ADSIEdit

The scripts are straightforward – the cmdlets get the user and pipe to set. The difference is the parameter we use

The provider uses Set-Itemproperty and the only oddity in the script is we use logonhours[0] as the property. This forces acceptance of the byte array

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