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revoke.sharedmailboxes.ps1
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revoke.sharedmailboxes.ps1
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#####################################################
# HelloID-Conn-Prov-Target-ExchangeOnline-RevokePermission-SharedMailbox
#
# Version: 2.0.0
#####################################################
# Initialize default values
$c = $configuration | ConvertFrom-Json
# The accountReference object contains the Identification object provided in the account create call
$aRef = $accountReference | ConvertFrom-Json
# The permissionReference object contains the Identification object provided in the retrieve permissions call
$pRef = $permissionReference | ConvertFrom-Json
$success = $false # Set to false at start, at the end, only when no error occurs it is set to true
$auditLogs = [System.Collections.Generic.List[PSCustomObject]]::new()
# Set TLS to accept TLS, TLS 1.1 and TLS 1.2
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls -bor [Net.SecurityProtocolType]::Tls11 -bor [Net.SecurityProtocolType]::Tls12
# Set debug logging
switch ($($c.isDebug)) {
$true { $VerbosePreference = "Continue" }
$false { $VerbosePreference = "SilentlyContinue" }
}
$InformationPreference = "Continue"
$WarningPreference = "Continue"
# Define configuration properties as required
$requiredConfigurationFields = @("AzureADOrganization", "AzureADTenantId", "AzureADAppId", "AzureADAppSecret")
# Used to connect to Exchange Online in an unattended scripting scenario using an App ID and App Secret to create an Access Token.
$AADOrganization = $c.AzureADOrganization
$AADTenantId = $c.AzureADTenantId
$AADAppID = $c.AzureADAppId
$AADAppSecret = $c.AzureADAppSecret
# PowerShell commands to import
$commands = @(
"Remove-MailboxPermission"
, "Remove-RecipientPermission"
, "Set-Mailbox"
)
#region functions
function Resolve-HTTPError {
[CmdletBinding()]
param (
[Parameter(Mandatory,
ValueFromPipeline
)]
[object]$ErrorObject
)
process {
$httpErrorObj = [PSCustomObject]@{
FullyQualifiedErrorId = $ErrorObject.FullyQualifiedErrorId
MyCommand = $ErrorObject.InvocationInfo.MyCommand
RequestUri = $ErrorObject.TargetObject.RequestUri
ScriptStackTrace = $ErrorObject.ScriptStackTrace
ErrorMessage = ""
}
if ($ErrorObject.Exception.GetType().FullName -eq "Microsoft.PowerShell.Commands.HttpResponseException") {
$httpErrorObj.ErrorMessage = $ErrorObject.ErrorDetails.Message
}
elseif ($ErrorObject.Exception.GetType().FullName -eq "System.Net.WebException") {
$httpErrorObj.ErrorMessage = [System.IO.StreamReader]::new($ErrorObject.Exception.Response.GetResponseStream()).ReadToEnd()
}
Write-Output $httpErrorObj
}
}
function Get-ErrorMessage {
[CmdletBinding()]
param (
[Parameter(Mandatory,
ValueFromPipeline
)]
[object]$ErrorObject
)
process {
$errorMessage = [PSCustomObject]@{
VerboseErrorMessage = $null
AuditErrorMessage = $null
}
if ( $($ErrorObject.Exception.GetType().FullName -eq "Microsoft.PowerShell.Commands.HttpResponseException") -or $($ErrorObject.Exception.GetType().FullName -eq "System.Net.WebException")) {
$httpErrorObject = Resolve-HTTPError -Error $ErrorObject
$errorMessage.VerboseErrorMessage = $httpErrorObject.ErrorMessage
$errorMessage.AuditErrorMessage = $httpErrorObject.ErrorMessage
}
# If error message empty, fall back on $ex.Exception.Message
if ([String]::IsNullOrEmpty($errorMessage.VerboseErrorMessage)) {
$errorMessage.VerboseErrorMessage = $ErrorObject.Exception.Message
}
if ([String]::IsNullOrEmpty($errorMessage.AuditErrorMessage)) {
$errorMessage.AuditErrorMessage = $ErrorObject.Exception.Message
}
Write-Output $errorMessage
}
}
#endregion functions
try {
# Check if required fields are available in configuration object
$incompleteConfiguration = $false
foreach ($requiredConfigurationField in $requiredConfigurationFields) {
if ($requiredConfigurationField -notin $c.PsObject.Properties.Name) {
$incompleteConfiguration = $true
Write-Warning "Required configuration object field [$requiredConfigurationField] is missing"
}
elseif ([String]::IsNullOrEmpty($c.$requiredConfigurationField)) {
$incompleteConfiguration = $true
Write-Warning "Required configuration object field [$requiredConfigurationField] has a null or empty value"
}
}
if ($incompleteConfiguration -eq $true) {
throw "Configuration object incomplete, cannot continue."
}
try {
# Import module
$moduleName = "ExchangeOnlineManagement"
# If module is imported say that and do nothing
if (Get-Module -Verbose:$false | Where-Object { $_.Name -eq $ModuleName }) {
Write-Verbose "Module [$ModuleName] is already imported."
}
else {
# If module is not imported, but available on disk then import
if (Get-Module -ListAvailable -Verbose:$false | Where-Object { $_.Name -eq $ModuleName }) {
$module = Import-Module $ModuleName -Cmdlet $commands -Verbose:$false
Write-Verbose "Imported module [$ModuleName]"
}
else {
# If the module is not imported, not available and not in the online gallery then abort
throw "Module [$ModuleName] is not available. Please install the module using: Install-Module -Name [$ModuleName] -Force"
}
}
}
catch {
$ex = $PSItem
$errorMessage = Get-ErrorMessage -ErrorObject $ex
Write-Verbose "Error at Line [$($ex.InvocationInfo.ScriptLineNumber)]: $($ex.InvocationInfo.Line). Error: $($errorMessage.VerboseErrorMessage)"
$auditLogs.Add([PSCustomObject]@{
# Action = "" # Optional
Message = "Error importing module [$ModuleName]. Error Message: $($errorMessage.AuditErrorMessage)"
IsError = $True
})
# Skip further actions, as this is a critical error
continue
}
# Connect to Exchange
try {
# Create access token
Write-Verbose "Creating Access Token"
$baseUri = "https://login.microsoftonline.com/"
$authUri = $baseUri + "$AADTenantId/oauth2/token"
$body = @{
grant_type = "client_credentials"
client_id = "$AADAppID"
client_secret = "$AADAppSecret"
resource = "https://outlook.office365.com"
}
$Response = Invoke-RestMethod -Method POST -Uri $authUri -Body $body -ContentType "application/x-www-form-urlencoded" -UseBasicParsing:$true
$accessToken = $Response.access_token
# Connect to Exchange Online in an unattended scripting scenario using an access token.
Write-Verbose "Connecting to Exchange Online"
$exchangeSessionParams = @{
Organization = $AADOrganization
AppID = $AADAppID
AccessToken = $accessToken
CommandName = $commands
ShowBanner = $false
ShowProgress = $false
TrackPerformance = $false
ErrorAction = "Stop"
}
$exchangeSession = Connect-ExchangeOnline @exchangeSessionParams
Write-Information "Successfully connected to Exchange Online"
}
catch {
$ex = $PSItem
$errorMessage = Get-ErrorMessage -ErrorObject $ex
Write-Verbose "Error at Line [$($ex.InvocationInfo.ScriptLineNumber)]: $($ex.InvocationInfo.Line). Error: $($errorMessage.VerboseErrorMessage)"
$auditLogs.Add([PSCustomObject]@{
# Action = "" # Optional
Message = "Error connecting to Exchange Online. Error Message: $($errorMessage.AuditErrorMessage)"
IsError = $True
})
# Skip further actions, as this is a critical error
continue
}
# revoke Exchange Online Mailbox permission
foreach ($permission in $pRef.Permissions) {
switch ($permission) {
"Full Access" {
try {
Write-Verbose "Revoking permission [FullAccess] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]"
$FullAccessPermissionSplatParams = @{
Identity = $pRef.id
User = $aRef.Guid
AccessRights = 'FullAccess'
InheritanceType = 'All'
Confirm = $false
}
if ($dryRun -eq $false) {
$removeFullAccessPermission = Remove-MailboxPermission @FullAccessPermissionSplatParams -ErrorAction Stop
$auditLogs.Add([PSCustomObject]@{
# Action = "" # Optional
Message = "Successfully revoked permission [FullAccess] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]"
IsError = $false
})
}
else {
Write-Warning "DryRun: would revoke permission [FullAccess] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]"
}
}
catch {
$ex = $PSItem
$errorMessage = Get-ErrorMessage -ErrorObject $ex
Write-Verbose "Error at Line [$($ex.InvocationInfo.ScriptLineNumber)]: $($ex.InvocationInfo.Line). Error: $($errorMessage.VerboseErrorMessage)"
if ($($errorMessage.AuditErrorMessage) -like "*Microsoft.Exchange.Configuration.Tasks.ManagementObjectNotFoundException*" -and $($errorMessage.AuditErrorMessage) -like "*$($pRef.id)*") {
$auditLogs.Add([PSCustomObject]@{
# Action = "" # Optional
Message = "Mailbox [$($pRef.Name) ($($pRef.id))] couldn't be found. Possibly no longer exists. Skipped revoke of permission [FullAccess] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]"
IsError = $false
}
)
}
elseif ($($errorMessage.AuditErrorMessage) -like "*Microsoft.Exchange.Configuration.Tasks.ManagementObjectNotFoundException*" -and $($errorMessage.AuditErrorMessage) -like "*$($aRef.Guid)*") {
$auditLogs.Add([PSCustomObject]@{
# Action = "" # Optional
Message = "User [$($aRef.UserPrincipalName) ($($aRef.Guid))] couldn't be found. Possibly no longer exists. Skipped revoke of permission [FullAccess] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]"
IsError = $false
}
)
}
else {
$auditLogs.Add([PSCustomObject]@{
# Action = "" # Optional
Message = "Error Revoking permission [FullAccess] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]. Error Message: $($errorMessage.AuditErrorMessage)"
IsError = $True
})
}
}
}
"Send As" {
try {
Write-Verbose "Revoking permission [SendAs] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]"
$sendAsPermissionSplatParams = @{
Identity = $pRef.id
Trustee = $aRef.Guid
AccessRights = 'SendAs'
Confirm = $false
}
if ($dryRun -eq $false) {
$removeSendAsPermission = Remove-RecipientPermission @sendAsPermissionSplatParams -ErrorAction Stop
$auditLogs.Add([PSCustomObject]@{
# Action = "" # Optional
Message = "Successfully revoked permission [SendAs] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]"
IsError = $false
})
}
else {
Write-Warning "DryRun: would revoke permission [SendAs] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]"
}
}
catch {
$ex = $PSItem
$errorMessage = Get-ErrorMessage -ErrorObject $ex
Write-Verbose "Error at Line [$($ex.InvocationInfo.ScriptLineNumber)]: $($ex.InvocationInfo.Line). Error: $($errorMessage.VerboseErrorMessage)"
if ($($errorMessage.AuditErrorMessage) -like "*Microsoft.Exchange.Configuration.Tasks.ManagementObjectNotFoundException*" -and $($errorMessage.AuditErrorMessage) -like "*$($pRef.id)*") {
$auditLogs.Add([PSCustomObject]@{
# Action = "" # Optional
Message = "Mailbox [$($pRef.Name) ($($pRef.id))] couldn't be found. Possibly no longer exists. Skipped revoke of permission [SendAs] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]"
IsError = $false
}
)
}
elseif ($($errorMessage.AuditErrorMessage) -like "*Microsoft.Exchange.Configuration.Tasks.ManagementObjectNotFoundException*" -and $($errorMessage.AuditErrorMessage) -like "*$($aRef.Guid)*") {
$auditLogs.Add([PSCustomObject]@{
# Action = "" # Optional
Message = "User [$($aRef.UserPrincipalName) ($($aRef.Guid))] couldn't be found. Possibly no longer exists. Skipped revoke of permission [SendAs] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]"
IsError = $false
}
)
}
else {
$auditLogs.Add([PSCustomObject]@{
# Action = "" # Optional
Message = "Error revoking permission [SendAs] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]. Error Message: $($errorMessage.AuditErrorMessage)"
IsError = $True
})
}
}
}
"Send on Behalf" {
try {
Write-Verbose "Revoking permission [SendonBehalf] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]"
# Can only be assigned to mailbox (so just a user account isn't sufficient, there has to be a mailbox for the user)
$SendonBehalfPermissionSplatParams = @{
Identity = $pRef.id
GrantSendOnBehalfTo = @{remove = "$($aRef.Guid)" }
Confirm = $false
}
if ($dryRun -eq $false) {
$removeSendonBehalfPermission = Set-Mailbox @SendonBehalfPermissionSplatParams -ErrorAction Stop
$auditLogs.Add([PSCustomObject]@{
# Action = "" # Optional
Message = "Successfully revoked permission [SendonBehalf] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]"
IsError = $false
})
}
else {
Write-Warning "DryRun: would revoke permission [SendonBehalf] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]"
}
}
catch {
$ex = $PSItem
$errorMessage = Get-ErrorMessage -ErrorObject $ex
Write-Verbose "Error at Line [$($ex.InvocationInfo.ScriptLineNumber)]: $($ex.InvocationInfo.Line). Error: $($errorMessage.VerboseErrorMessage)"
if ($($errorMessage.AuditErrorMessage) -like "*Microsoft.Exchange.Configuration.Tasks.ManagementObjectNotFoundException*" -and $($errorMessage.AuditErrorMessage) -like "*$($pRef.id)*") {
$auditLogs.Add([PSCustomObject]@{
# Action = "" # Optional
Message = "Mailbox [$($pRef.Name) ($($pRef.id))] couldn't be found. Possibly no longer exists. Skipped revoke of permission [SendonBehalf] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]"
IsError = $false
}
)
}
elseif ($($errorMessage.AuditErrorMessage) -like "*Microsoft.Exchange.Configuration.Tasks.ManagementObjectNotFoundException*" -and $($errorMessage.AuditErrorMessage) -like "*$($aRef.Guid)*") {
$auditLogs.Add([PSCustomObject]@{
# Action = "" # Optional
Message = "User [$($aRef.UserPrincipalName) ($($aRef.Guid))] couldn't be found. Possibly no longer exists. Skipped revoke of permission [SendonBehalf] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]"
IsError = $false
}
)
}
else {
$auditLogs.Add([PSCustomObject]@{
# Action = "" # Optional
Message = "Error Revoking permission [SendonBehalf] to mailbox [$($pRef.Name) ($($pRef.id))] for user [$($aRef.UserPrincipalName) ($($aRef.Guid))]. Error Message: $($errorMessage.AuditErrorMessage)"
IsError = $True
})
}
}
}
}
}
}
finally {
# Check if auditLogs contains errors, if no errors are found, set success to true
if (-NOT($auditLogs.IsError -contains $true)) {
$success = $true
}
# Send results
$result = [PSCustomObject]@{
Success = $success
AuditLogs = $auditLogs
}
Write-Output ($result | ConvertTo-Json -Depth 10)
}