core/modules/monkeycloudutils/public/Read-JWTtoken.ps1
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# Monkey365 - the PowerShell Cloud Security Tool for Azure and Microsoft 365 (copyright 2022) by Juan Garrido # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. function Read-JWTtoken { <# .SYNOPSIS .DESCRIPTION .INPUTS .OUTPUTS .EXAMPLE .NOTES Author : Juan Garrido Twitter : @tr1ana File Name : Read-JWTtoken Version : 1.0 .LINK https://github.com/silverhack/monkey365 #> [cmdletbinding()] param([Parameter(Mandatory=$true)][string]$token) try{ #Validate as per https://tools.ietf.org/html/rfc7519 #Access and ID tokens are fine, Refresh tokens will not work if (!$token.Contains(".") -or !$token.StartsWith("eyJ")) { Write-Error "Invalid token" -ErrorAction Stop } #Header $tokenheader = $token.Split(".")[0].Replace('-', '+').Replace('_', '/') #Fix padding as needed, keep adding "=" until string length modulus 4 reaches 0 while ($tokenheader.Length % 4) { Write-Verbose "Invalid length for a Base-64 char array or string, adding ="; $tokenheader += "=" } #Payload $tokenPayload = $token.Split(".")[1].Replace('-', '+').Replace('_', '/') #Fix padding as needed, keep adding "=" until string length modulus 4 reaches 0 while ($tokenPayload.Length % 4) { Write-Verbose "Invalid length for a Base-64 char array or string, adding ="; $tokenPayload += "=" } #Convert to Byte array $tokenByteArray = [System.Convert]::FromBase64String($tokenPayload) #Convert to string array $tokenArray = [System.Text.Encoding]::ASCII.GetString($tokenByteArray) #Convert from JSON to PSObject $tokobj = $tokenArray | ConvertFrom-Json return $tokobj } catch{ Write-Error $_ } } |