Azure Env-based Auth

Azure AD environment-based authentication

Azure App registration

1. Create or use existing app registration

2. Make sure that the app is configured for a specific auth scenario:

• Client credentials (might not work with SharePoint but require a Certificate-based auth)

• Certificate

• Username/Password (public clients flows must be enabled)

• Managed identity

Follow instructions: https://docs.microsoft.com/en-us/sharepoint/dev/solution-guidance/security-apponly-azuread

• O365 Admin -> Azure Active Directory

• Generate self-signed certificate

# PowerShell, run on a Windows machine
$certName = "MyCert"
$password = "MyPassword"

$startDate = Get-Date
$endDate = (Get-Date).AddYears(5)
$securePass = (ConvertTo-SecureString -String $password -AsPlainText -Force)

.\Create-SelfSignedCertificate.ps1 -CommonName $certName -StartDate $startDate -EndDate $endDate -Password $securePass

or on a Linux or macOS client via openssl:

chmod +x ./Create-SelfSignedCertificate.sh
./Create-SelfSignedCertificate.sh

Get scripts.

• New App Registration

  • Accounts in this organizational directory only

  • API Permissions -> SharePoint :: Application :: Sites.FullControl.All -> Grant Admin Consent

  • Certificates & Secrets -> Upload .cer file

• Use environment variables to provide creds bindings:

  • AZURE_TENANT_ID - Directory (tenant) ID in App Registration

  • AZURE_CLIENT_ID - Application (client) ID in App Registration

  • For certificate-base auth:

    • AZURE_CERTIFICATE_PATH - path to .pfx file

    • AZURE_CERTIFICATE_PASSWORD - password used for self-signed certificate

  • For username/password auth:

    • AZURE_USERNAME

    • AZURE_PASSWORD

Auth configuration and usage

package main

import (
    "fmt"
    "log"
    "os"

    "github.com/koltyakov/gosip"
    "github.com/koltyakov/gosip/api"
    strategy "github.com/koltyakov/gosip-sandbox/strategies/azureenv"
)

func main() {

    // os.Setenv("AZURE_TENANT_ID", "b1bacba7-c38a-414b-8c8b-65df26a15749")
    // os.Setenv("AZURE_CLIENT_ID", "8ca10ce6-c3d5-47c6-b803-0ef3b619f464")
    // os.Setenv("AZURE_CERTIFICATE_PATH", "/path/to/cert.pfx")
    // os.Setenv("AZURE_CERTIFICATE_PASSWORD", "cert-password")

    authCnfg := &strategy.AuthCnfg{
        SiteURL: os.Getenv("SPAUTH_SITEURL"),
    }

    client := &gosip.SPClient{AuthCnfg: authCnfg}
    sp := api.NewSP(client)

    res, err := sp.Web().Select("Title").Get()
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Site title: %s\n", res.Data().Title)

}

Environment variables auto-injection

Environment variables can be automatically injected in a runtime for Azure AAD library. To use injection add correcponding environment variables in private.json into env JSON property:

{
  "siteUrl": "https://contoso.sharepoint.com/sites/site",
  "env": {
    "AZURE_TENANT_ID": "1efde0dc-21f5-4d3d-a053-1da762c7838c",
    "AZURE_CLIENT_ID": "7278fe9b-acd5-4be5-b688-999603560d31",
    "AZURE_CERTIFICATE_PATH": "./certs/MyCert.pfx",
    "AZURE_CERTIFICATE_PASSWORD": "MyPassword"
  }
}