DSCResources/cMsmqQueuePermissionEntry/cMsmqQueuePermissionEntry.psm1

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
<#
Author : Serge Nikalaichyk (https://www.linkedin.com/in/nikalaichyk)
Version : 1.0.3
Date : 2015-11-24
#>



function Get-TargetResource
{
    [CmdletBinding()]
    [OutputType([Hashtable])]
    param
    (
        [Parameter(Mandatory = $false)]
        [ValidateSet('Absent', 'Present')]
        [String]
        $Ensure = 'Present',

        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [String]
        $Name,

        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [String]
        $Principal,

        [Parameter(Mandatory = $false)]
        [ValidateNotNullOrEmpty()]
        [String[]]
        $AccessRights = @('GenericRead')
    )
    begin
    {
        try
        {
            $Service = Get-Service -Name MSMQ -ErrorAction Stop

            if ($Service.Status -ne 'Running')
            {
                throw 'Please ensure that the Message Queuing (MSMQ) service is running.'
            }
        }
        catch
        {
            throw $_.Exception.Message
        }

        Initialize-cMsmqType
    }
    process
    {
        $QueuePath = '.\private$\{0}' -f $Name

        if (-not [System.Messaging.MessageQueue]::Exists($QueuePath))
        {
            Write-Error -Message "Queue '$Name' could not be found at the specified path: '$QueuePath'."

            return
        }

        $CurrentPermission = Get-cMsmqQueuePermission -Name $Name -Principal $Principal -ErrorAction SilentlyContinue

        if ($CurrentPermission)
        {
            "An existing permission entry was found for principal '$Principal' on queue '$Name':",
            "Currently assigned permissions: '$CurrentPermission'." |
            Write-Verbose

            if ($Ensure -eq 'Present')
            {
                $DesiredPermission = [System.Messaging.MessageQueueAccessRights]$AccessRights

                if ($CurrentPermission -eq $DesiredPermission)
                {
                    $EnsureResult = 'Present'
                }
                else
                {
                    $EnsureResult = 'Absent'
                }
            }
            elseif ($Ensure -eq 'Absent')
            {
                $EnsureResult = 'Present'
            }

            $AccessRightsResult = @($CurrentPermission.ToString() -split ', ')
        }
        else
        {
            Write-Verbose -Message "There is no existing permission entry found for principal '$Principal' on queue '$Name'."

            $EnsureResult = 'Absent'
            $AccessRightsResult = @()
        }

        $ReturnValue = @{
                Ensure = $EnsureResult
                Name = $Name
                Principal = $Principal
                AccessRights = $AccessRightsResult
            }

        return $ReturnValue
    }
}


function Test-TargetResource
{
    [CmdletBinding()]
    [OutputType([Boolean])]
    param
    (
        [Parameter(Mandatory = $false)]
        [ValidateSet('Absent', 'Present')]
        [String]
        $Ensure = 'Present',

        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [String]
        $Name,

        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [String]
        $Principal,

        [Parameter(Mandatory = $false)]
        [ValidateNotNullOrEmpty()]
        [String[]]
        $AccessRights = @('GenericRead')
    )

    $PSBoundParameters.GetEnumerator() |
    ForEach-Object -Begin {
        $Width = $PSBoundParameters.Keys.Length | Sort-Object -Descending | Select-Object -First 1
    } -Process {
        "{0,-$($Width)} : '{1}'" -f $_.Key, ($_.Value -join ', ') |
        Write-Verbose
    }

    $TargetResource = Get-TargetResource @PSBoundParameters

    $InDesiredState = $Ensure -eq $TargetResource.Ensure

    if ($InDesiredState -eq $true)
    {
        Write-Verbose -Message "The target resource is already in the desired state. No action is required."
    }
    else
    {
        Write-Verbose -Message "The target resource is not in the desired state."
    }

    return $InDesiredState

}


function Set-TargetResource
{
    [CmdletBinding(SupportsShouldProcess = $true)]
    param
    (
        [Parameter(Mandatory = $false)]
        [ValidateSet('Absent', 'Present')]
        [String]
        $Ensure = 'Present',

        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [String]
        $Name,

        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [String]
        $Principal,

        [Parameter(Mandatory = $false)]
        [ValidateNotNullOrEmpty()]
        [String[]]
        $AccessRights = @('GenericRead')
    )

    if (-not $PSCmdlet.ShouldProcess($Name))
    {
        return
    }

    $CurrentUser = [System.Security.Principal.WindowsIdentity]::GetCurrent().Name

    $QueuePath = '.\private$\{0}' -f $Name

    if (-not [System.Messaging.MessageQueue]::Exists($QueuePath))
    {
        Write-Error -Message "Queue '$Name' could not be found at the specified path: '$QueuePath'."

        return
    }

    $Queue = New-Object -TypeName System.Messaging.MessageQueue -ArgumentList $QueuePath

    $DesiredPermission = [System.Messaging.MessageQueueAccessRights]$AccessRights

    Write-Verbose -Message "Testing if the current user has the permission necessary to perform the operation."

    $CurrentUserPermission = Get-cMsmqQueuePermission -Name $Name -Principal $CurrentUser -ErrorAction SilentlyContinue
    $PermissionToTest = [System.Messaging.MessageQueueAccessRights]::ChangeQueuePermissions

    if (-not $CurrentUserPermission -or -not $CurrentUserPermission.HasFlag($PermissionToTest))
    {
        "User '{0}' does not have the '{1}' permission on queue '{2}'." -f $CurrentUser, $PermissionToTest, $Name |
        Write-Verbose

        Reset-cMsmqQueueSecurity -Name $Name -Confirm:$false -Verbose:$VerbosePreference
    }

    if ($Ensure -eq 'Absent')
    {
        Write-Verbose -Message "Revoking all existing permissions for principal '$Principal' on queue '$Name'."

        $Queue.SetPermissions($Principal, $DesiredPermission, [System.Messaging.AccessControlEntryType]::Revoke)
    }
    else
    {
        Write-Verbose -Message "Setting permissions for principal '$Principal' on queue '$Name'."

        $Queue.SetPermissions($Principal, $DesiredPermission, [System.Messaging.AccessControlEntryType]::Set)
    }

}


Export-ModuleMember -Function Get-TargetResource, Set-TargetResource, Test-TargetResource


#region Helper Functions

function Initialize-cMsmqType
{
    <#
    .SYNOPSIS
        Initializes custom and native MSMQ types.
    .DESCRIPTION
        The Initialize-cMsmqType function initializes custom and native MSMQ types.
    #>


    $DllFilePath = Split-Path -Path $PSScriptRoot -Parent |
        Split-Path -Parent |
        Join-Path -ChildPath 'cMsmq.dll'

    if ([AppDomain]::CurrentDomain.GetAssemblies().Location -notcontains $DllFilePath)
    {
        Add-Type -Path $DllFilePath -ErrorAction Stop
    }

    if ([AppDomain]::CurrentDomain.GetAssemblies().ManifestModule.Name -notcontains 'System.Messaging.dll')
    {
        Add-Type -AssemblyName System.Messaging -ErrorAction Stop
    }
}

Initialize-cMsmqType


function Get-cMsmqQueuePermission
{
    <#
    .SYNOPSIS
        Gets the access rights of the specified principal on the specified private MSMQ queue.
    .DESCRIPTION
        The Get-cMsmqQueuePermission function gets the access rights that have been granted
        to the specified security principal on the specified private MSMQ queue.
    .PARAMETER Name
        Specifies the name of the queue.
    .PARAMETER Principal
        Specifies the identity of the principal.
    #>

    [CmdletBinding()]
    [OutputType([System.Messaging.MessageQueueAccessRights])]
    param
    (
        [Parameter(Mandatory = $true)]
        [String]
        $Name,

        [Parameter(Mandatory = $true)]
        [String]
        $Principal
    )
    begin
    {
        Initialize-cMsmqType
    }
    process
    {
        try
        {
            Write-Verbose -Message "Getting permissions for principal '$Principal' on queue '$Name'."

            $AccessMask = [cMsmq.Security]::GetAccessMask($Name, $Principal)
            $OutputObject = [System.Messaging.MessageQueueAccessRights]$AccessMask.value__

            return $OutputObject
        }
        catch
        {
            Write-Error -Message $_.Exception.Message

            return
        }
    }
}


function Reset-cMsmqQueueSecurity
{
    <#
    .SYNOPSIS
        Resets the security settings on the specified private MSMQ queue.
    .DESCRIPTION
        The Reset-cMsmqQueueSecurity function performs the following actions:
            - Grants ownership of the queue to the SYSTEM account (DSC runs as SYSTEM);
            - Resets the permission list to the operating system's default values.
    .PARAMETER Name
        Specifies the name of the queue.
    #>

    [CmdletBinding(ConfirmImpact = 'High', SupportsShouldProcess = $true)]
    param
    (
        [Parameter(Mandatory = $true, ValueFromPipeline = $true)]
        [ValidateNotNullOrEmpty()]
        [String]
        $Name
    )
    begin
    {
        Initialize-cMsmqType

        $DefaultSecurity = 'Security=010007801c0000002800000000000000140000000200080000000000' +
            '010100000000000512000000010500000000000515000000e611610036157811027bc60001020000'
    }
    process
    {
        if (-not $PSCmdlet.ShouldProcess($Name, 'Reset Queue Security'))
        {
            return
        }

        $QueuePath = '.\private$\{0}' -f $Name

        $CurrentUser = [System.Security.Principal.WindowsIdentity]::GetCurrent().Name
        $QueueOwner = [cMsmq.Security]::GetOwner($Name)

        Write-Verbose -Message "Queue Owner : '$QueueOwner'"

        if ($CurrentUser -ne $QueueOwner)
        {
            Write-Verbose -Message "Taking ownership of queue '$Name'."

            $FilePath = Get-ChildItem -Path "$Env:SystemRoot\System32\msmq\storage\lqs" -Force |
                Select-String -Pattern "QueueName=\private`$\$($Name)" -SimpleMatch |
                Select-Object -ExpandProperty Path

            if (-not $FilePath)
            {
                Write-Error -Message "Could not find a corresponding .INI file for queue '$Name'."

                return
            }

            (Get-Content -Path $FilePath) |
            ForEach-Object {$_ -replace '^Security=.+', $DefaultSecurity} |
            Set-Content -Path $FilePath
        }

        Write-Verbose -Message "Resetting permissions on queue '$Name'."

        $Queue = New-Object -TypeName System.Messaging.MessageQueue
        $Queue.Path = $QueuePath
        $Queue.ResetPermissions()
    }
}


#endregion