-
Notifications
You must be signed in to change notification settings - Fork 572
/
GetAzureADAccessReviewDetailsGraph.PS1
201 lines (180 loc) · 9.41 KB
/
GetAzureADAccessReviewDetailsGraph.PS1
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
# GetAzureADAccessReviewDetailsGraph.PS1
# https://github.com/12Knocksinna/Office365itpros/blob/master/GetAzureADAccessReviewDetailsGraph.PS1
# A script to show how to navigate the Graph interface for Azure AD Access Reviews, especially a review set up for all Groups and Teams
# V1.0 15-Jan-2021
# App must be assigned the AccessReview.ReadWrite.All, AccessReview.ReadWrite.Members, Group.Read.All, and User.Read.All (application) permissions to work
#
function Get-GraphData {
# GET data from Microsoft Graph.
# Based on https://danielchronlund.com/2018/11/19/fetch-data-from-microsoft-graph-with-powershell-paging-support/
param (
[parameter(Mandatory = $true)]
$AccessToken,
[parameter(Mandatory = $true)]
$Uri
)
# Check if authentication was successful.
if ($AccessToken) {
# Format headers.
$Headers = @{
'Content-Type' = "application\json"
'Authorization' = "Bearer $AccessToken"
'ConsistencyLevel' = "eventual" }
# Create an empty array to store the result.
$QueryResults = @()
# Invoke REST method and fetch data until there are no pages left.
do {
$Results = ""
$StatusCode = ""
do {
try {
$Results = Invoke-RestMethod -Headers $Headers -Uri $Uri -UseBasicParsing -Method "GET" -ContentType "application/json"
$StatusCode = $Results.StatusCode
} catch {
$StatusCode = $_.Exception.Response.StatusCode.value__
if ($StatusCode -eq 429) {
Write-Warning "Got throttled by Microsoft. Sleeping for 45 seconds..."
Start-Sleep -Seconds 45
}
else {
Write-Error $_.Exception
}
}
} while ($StatusCode -eq 429)
if ($Results.value) {
$QueryResults += $Results.value
}
else {
$QueryResults += $Results
}
$uri = $Results.'@odata.nextlink'
} until (!($uri))
# Return the result.
$QueryResults
}
else {
Write-Error "No Access Token"
}
}
# Define the values applicable for the application used to connect to the Graph (change these details for your tenant and registered app)
$AppId = "0ade5c24-d775-4017-a824-0a993c60787d"
$TenantId = "a662313f-14fc-43a2-9a7a-d2e27f4f3428"
$AppSecret = '7RplGSLWoSs~y4uHYy2041-jbm.4~_s.~q'
$OutputCSV = "c:\temp\AzureADGuestReviews.CSV"
# Construct URI and body needed for authentication
$uri = "https://login.microsoftonline.com/$tenantId/oauth2/v2.0/token"
$body = @{
client_id = $AppId
scope = "https://graph.microsoft.com/.default"
client_secret = $AppSecret
grant_type = "client_credentials"
}
# Get OAuth 2.0 Token
$tokenRequest = Invoke-WebRequest -Method Post -Uri $uri -ContentType "application/x-www-form-urlencoded" -Body $body -UseBasicParsing
# Unpack Access Token
$token = ($tokenRequest.Content | ConvertFrom-Json).access_token
$Headers = @{
'Content-Type' = "application\json"
'Authorization' = "Bearer $Token"
'ConsistencyLevel' = "eventual" }
Write-Host "Fetching Azure AD Access Review Data..."
# Get Access Reviews currently running
$Uri = "https://graph.microsoft.com/beta/identityGovernance/accessReviews/definitions"
$AccessData = Get-GraphData -AccessToken $Token -Uri $uri
# Find the access review for Teams and Groups
# This check depends on the display name you assign to the access review in the Azure AD admin center
$Id = $Accessdata | Where-Object {$_.displayname -eq "Review guest access across Microsoft 365 Groups"} | Select-Object -ExpandProperty Id
If ($Id -eq $Null) { Write-Host "Can't find access review - please check the display name"; break }
# Find the instances (groups being reviewed)
$Uri = "https://graph.microsoft.com/beta/identityGovernance/accessReviews/definitions/" + $Id +"/instances"
$AccessData = Get-GraphData -AccessToken $Token -Uri $uri
$CountOfGroups = $AccessData.Count
$Report = [System.Collections.Generic.List[Object]]::new()
$ApproveCount = 0; $DenyCount = 0; $NoDecision = 0
ForEach ($Instance in $AccessData) {
$InstanceId = $Instance.Id
# Get group id
$Start = $Instance.scope.query.IndexOf("s/")
$End = $Instance.scope.query.IndexOf("/members")
$GroupId = $Instance.scope.query.substring($Start + 2,$End - 13)
$Uri = "https://graph.microsoft.com/v1.0/groups/" + $GroupId
$GroupDetails = Get-GraphData -AccessToken $Token -Uri $uri
$GroupName = $GroupDetails.DisplayName
# Now get the instances (people being reviewed) and what's happened to each
$GroupUnderReview = 0 # Flag to track if a group has started review. Set if a Deny or Approve decision is made
$Uri = "https://graph.microsoft.com/beta/identityGovernance/accessReviews/definitions/" + $Id +"/instances/" + $instanceId + "/decisions"
$InstanceData = Get-GraphData -AccessToken $Token -Uri $uri
Write-Host "Number of Guests to review in" $GroupName ":" $InstanceData.id.Count
If ($InstanceData.id.Count -gt 0) {
ForEach ($Decision in $InstanceData) {
Switch ($Decision.decision) { # Only generate report if guests are present to review
"Deny" {
$DenyCount++; $GroupUnderReview = 1
$Verdict = $Decision.decision
$User = $decision.target.userprincipalname
$Name = $decision.target.userdisplayname
$justification = $decision.justification
$Recommendation = $Decision.recommendation
$reviewer = $decision.reviewedby.displayname
$ReviewDate = (get-date $decision.revieweddatetime -format g) }
"Approve" {
$ApproveCount++
$Verdict = $Decision.decision; $GroupUnderReview = 1
$User = $decision.target.userprincipalname
$Name = $decision.target.userdisplayname
$justification = $decision.justification
$Recommendation = $Decision.recommendation
$reviewer = $decision.reviewedby.displayname
$ReviewDate = (get-date $decision.revieweddatetime -format g) }
"NotReviewed" {
$NoDecision++
$Verdict = $Decision.decision
$User = $decision.target.userprincipalname
$Name = $decision.target.userdisplayname
$justification = $decision.justification
$Recommendation = $Decision.recommendation
$reviewer = $decision.reviewedby.displayname
$ReviewDate = "No decision made" }
} #End Switch
# Report decision
$ReportLine = [PSCustomObject] @{
User = $User
Name = $Name
Verdict = $Verdict
Recommendation = $Recommendation.Trim()
Reviewer = $Reviewer
ReviewDate = $ReviewDate
Justification = $Justification.Trim()
Group = $GroupName }
$Report.Add($ReportLine)
} # End report if any guests are found to review
} #End ForEach InstanceData
If ($GroupUnderReview -eq 1) { $GroupsWithReview++ }
} #End ForEach AccessData
# Quick way of reporting counts for the various verdicts is to group the report data, but we want some nice figures
# $Report | Group-Object Verdict | format-Table Name, Count
$CountOfApprovals = ($Report | Where-Object {$_.Verdict -eq "Approve"} | Measure)
$CountOfDeny = ($Report | Where-Object {$_.Verdict -eq "Deny"} | Measure )
$CountOfNoDecision = ($Report | Where-Object {$_.Verdict -eq "NotReviewed"} | Measure)
Write-Host "Number of Groups with reviews for Guest Members: " $CountOfGroups
CLS
Write-Host ""
Write-Host "Decision Profile"
Write-Host "----------------"
Write-Host ""
Write-Host "Total Groups with Guests: " $CountOfGroups
Write-Host "Groups started reviews: " $GroupsWithReview
Write-Host "Groups not started reviews " ($CountOfGroups - $GroupsWithReview)
Write-Host "Total decisions to be made: " $Report.Count
Write-Host ("Review decisions to approve guest access: {0} ({1})" -f $CountOfApprovals.Count, ($CountOfApprovals.Count/$Report.Count).ToString("P") )
Write-Host ("Review decisions to deny guest access: {0} ({1})" -f $CountOfDeny.Count, ($CountOfDeny.Count/$Report.Count).ToString("P") )
Write-Host ("No decisions made so far: {0} ({1})" -f $CountOfNoDecision.Count, ($CountOfNoDecision.Count/$Report.Count).ToString("P") )
Write-Host " "
Write-Host "A CSV file for current Access Review decision status is available in" $OutputCSV
# Output files
$Report | Sort User | Export-CSV -NoTypeInformation $OutputCSV
$Report | Sort User | Out-GridView
# An example script used to illustrate a concept. More information about the topic can be found in the Office 365 for IT Pros eBook https://gum.co/O365IT/
# and/or a relevant article on https://office365itpros.com or https://www.practical365.com. See our post about the Office 365 for IT Pros repository # https://office365itpros.com/office-365-github-repository/ for information about the scripts we write.
# Do not use our scripts in production until you are satisfied that the code meets the need of your organization. Never run any code downloaded from the Internet without
# first validating the code in a non-production environment.