Module/Rule.IISLogging/Convert/IISLoggingRule.Convert.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
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License.
using module .\..\..\Common\Common.psm1
using module .\..\IisLoggingRule.psm1


$exclude = @($MyInvocation.MyCommand.Name,'Template.*.txt')
$supportFileList = Get-ChildItem -Path $PSScriptRoot -Exclude $exclude
foreach ($supportFile in $supportFileList)
{
    Write-Verbose "Loading $($supportFile.FullName)"
    . $supportFile.FullName
}
# Header

<#
    .SYNOPSIS
        Convert the contents of an xccdf check-content element into an IIS
        Logging object
    .DESCRIPTION
        The IisLoggingRuleConvert class is used to extract the IIS Log Settings from
        the check-content of the xccdf. Once a STIG rule is identified as an
        IIS Log rule, it is passed to the IisLoggingRuleConvert class for parsing
        and validation.
#>

class IisLoggingRuleConvert : IisLoggingRule
{
    <#
        .SYNOPSIS
            Empty constructor for SplitFactory
    #>

    IisLoggingRuleConvert ()
    {
    }

    <#
        .SYNOPSIS
            Converts a xccdf stig rule element into a Iis Logging Rule
        .PARAMETER XccdfRule
            The STIG rule to convert
    #>

    IisLoggingRuleConvert ([xml.xmlelement] $XccdfRule) : base ($XccdfRule, $true)
    {
        if ($this.conversionstatus -eq 'pass')
        {
            $this.SetDuplicateRule()
        }
        $this.SetLogCustomFields()
        $this.SetLogFlags()
        $this.SetLogFormat()
        $this.SetLogPeriod()
        $this.SetLogTargetW3C()
        $this.SetStatus()
        $this.SetDscResource()
    }

    <#
        .SYNOPSIS
            Extracts the log custom field from the check-content and sets the value
        .DESCRIPTION
            Gets the log custom field from the xccdf content and sets the value.
            If the log custom field that is returned is not valid, the parser
            status is set to fail
    #>

    [void] SetLogCustomFields ()
    {
        $thisLogCustomField = Get-LogCustomFieldEntry -CheckContent $this.SplitCheckContent

        $this.set_LogCustomFieldEntry($thisLogCustomField)
    }

    <#
        .SYNOPSIS
            Extracts the log flag from the check-content and sets the value
        .DESCRIPTION
            Gets the log flag from the xccdf content and sets the value. If the
            log flag that is returned is not valid, the parser status is set
            to fail
    #>

    [void] SetLogFlags ()
    {
        $thisLogFlag = Get-LogFlag -CheckContent $this.SplitCheckContent

        if (-not [String]::IsNullOrEmpty($thisLogFlag))
        {
            $this.set_LogFlags($thisLogFlag)
        }
    }

    <#
        .SYNOPSIS
            Extracts the log format from the check-content and sets the value
        .DESCRIPTION
            Gets the log format from the xccdf content and sets the value. If the
            log format that is returned is not valid, the parser status is set
            to fail.
    #>

    [void] SetLogFormat ()
    {
        $thisLogFormat = Get-LogFormat -CheckContent $this.SplitCheckContent

        if (-not [String]::IsNullOrEmpty($thisLogFormat))
        {
            $this.set_LogFormat($thisLogFormat)
        }
    }

    <#
        .SYNOPSIS
            Extracts the log period from the check-content and sets the value
        .DESCRIPTION
            Gets the log period from the xccdf content and sets the value. If the
            log period that is returned is not valid, the parser status is set
            to fail.
    #>

    [void] SetLogPeriod ()
    {
        $thisLogPeriod = Get-LogPeriod -CheckContent $this.SplitCheckContent

        if (-not [String]::IsNullOrEmpty($thisLogPeriod))
        {
            $this.set_LogPeriod($thisLogPeriod)
        }
    }

    <#
        .SYNOPSIS
            Extracts the log target from the check-content and sets the value
        .DESCRIPTION
            Gets the log target from the xccdf content and sets the value. If the
            log target that is returned is not valid, the parser status is set
            to fail.
    #>

    [void] SetLogTargetW3C ()
    {
        $thisLogTargetW3C = Get-LogTargetW3C -CheckContent $this.SplitCheckContent

        if (-not [String]::IsNullOrEmpty($thisLogTargetW3C))
        {
            $this.set_LogTargetW3C($thisLogTargetW3C)
        }
    }

    <#
        .SYNOPSIS
            Validates the parsed data and sets the parser status
        .DESCRIPTION
            Compares the created rule object against and base stig object to
            make sure that all of the properties have be set to valid values.
    #>

    [void] SetStatus ()
    {
        $baseRule = $this.GetType().BaseType.BaseType::New()
        $referenceProperties = ($baseRule | Get-Member -MemberType Property).Name
        $differenceProperties = ($this | Get-Member -MemberType Property).Name
        $propertyList = (Compare-Object -ReferenceObject $referenceProperties -DifferenceObject $differenceProperties).InputObject

        $status = $false

        foreach ($property in $propertyList)
        {
            if ($null -ne $this.$property)
            {
                $status = $true
            }
        }

        if (-not $status)
        {
            $this.conversionstatus = [status]::fail
        }
    }

    hidden [void] SetDscResource ()
    {
        if ($null -eq $this.DuplicateOf)
        {
            if ($global:stigTitle -match "Server")
            {
                $this.DscResource = 'xIISLogging'
            }
            else
            {
                $this.DscResource = 'XWebsite'
            }
        }
        else
        {
            $this.DscResource = 'None'
        }
    }

    static [bool] Match ([string] $CheckContent)
    {
        if
        (
            $CheckContent -Match 'Logging' -and
            $CheckContent -Match 'IIS 8\.5|IIS 10\.0' -and
            $CheckContent -NotMatch 'review source IP' -and
            $CheckContent -NotMatch 'verify only authorized groups' -and
            $CheckContent -NotMatch 'Confirm|Consult with the System Administrator' -and
            $CheckContent -Notmatch 'If an account associated with roles other than auditors'
        )
        {
            return $true
        }
        return $false
    }
    #endregion
}