Tag: go

i decided to make my G Suite “mdmtool” a bit more robust and release-worthy, instead of just proof of concept code.

(link: https://github.com/rickt/mdmtool) github.com/rickt/mdmtool.

enjoy!

Our desktop support & G Suite admin folks needed a simple, fast command-line tool to query basic info about our company’s mobile devices (which are all managed using G Suite’s built-in MDM).

So I wrote one.

Since this tool needs to be run via command-line, it can’t use any interactive or browser-based authentication, so we need to use a service account for authentication.

Pre-requisites (GCP & G Suite):

• Create a service account in your G Suite domain (Google Cloud Console –> IAM & Admin –> Service Accounts)
• Be sure that you have checked the “Enable G Suite Domain-wide Delegation” box as this will give your new service account the appropriate permissions to query the G Suite Admin API

• Download the service account JSON credentials file. Open it up and find the client_id. Make a note of it!
• Now we need to authorize the client_id of your service account for the necessary API scopes. In the Admin Console for your G Suite domain (Admin Console –> Security –> Advanced Settings –> Authentication –> Manage API Client Access), add your client_id in the “Client Name” box, and add

  https://www.googleapis.com/auth/admin.directory.device.mobile.readonly

  in the “One or more API scopes” box

• Click the “Authorize” button when you’re finished

Pre-requisites (Go)
You’ll need to “go get” a few packages:

• go get -u golang.org/x/oauth2/google

• go get -u google.golang.org/api/admin/directory/v1

• go get -u github.com/dustin/go-humanize

Pre-requisites (Environment Variables)
Because it’s never good to store runtime configuration within code, you’ll notice that the code references several environment variables. Setup them up to suit your preference but something like this will do:

export GSUITE_COMPANYID="A01234567"
export SVC_ACCOUNT_CREDS_JSON="/home/rickt/dev/adminsdk/golang/creds.json
export GSUITE_ADMINUSER="foo@bar.com"

And finally, the code
Gist URL: https://gist.github.com/rickt/199ca2be87522496e83de77bd5cd7db2

	package main
	// https://rickt.org/2019/01/08/playing-with-g-suite-mdm-mobile-device-data-using-go/
	import (
	"context"
	"errors"
	"flag"
	"fmt"
	"github.com/dustin/go-humanize"
	"golang.org/x/oauth2/google"
	"google.golang.org/api/admin/directory/v1"
	"io/ioutil"
	"log"
	"os"
	"strings"
	"time"
	)
	// runtime usage:
	// Usage of ./mdmtool:
	// -all
	// List all MDM mobile devices
	// -imei string
	// IMEI of mobile device to search fors
	// -name string
	// Name of mobile device owner to search for
	// -sn string
	// Serial number of mobile device to search for
	// -status string
	// Search for mobile devices with specific status
	var (
	adminuser = os.Getenv("GSUITE_ADMINUSER")
	companyid = os.Getenv("GSUITE_COMPANYID")
	credsfile = os.Getenv("SVC_ACCOUNT_CREDS_JSON")
	devices *admin.MobileDevices
	row int = 0
	scopes = "https://www.googleapis.com/auth/admin.directory.device.mobile.readonly"
	searchtype = "all" // default search type
	sortorder = "name" // default sort order
	)
	// flags
	var (
	all *bool = flag.Bool("all", false, "List all MDM mobile devices")
	imei *string = flag.String("imei", "", "IMEI of mobile device to search for")
	name *string = flag.String("name", "", "Name of mobile device owner to search for")
	sn *string = flag.String("sn", "", "Serial number of mobile device to search for")
	status *string = flag.String("status", "", "Search for mobile devices with specific status")
	)
	// helper func to check errors
	func checkError(err error) {
	if err != nil {
	log.Fatal(err)
	}
	}
	// check the command line arguments/flags
	func checkFlags() (string, error) {
	// parse the flags
	flag.Parse()
	// show all devices?
	if *all == true {
	// -all shows ALL devices so doesn't work with any other option
	if *name != "" || *imei != "" || *sn != "" || *status != "" {
	return "", errors.New("Error: -all cannot be used with any other option")
	}
	return "all", nil
	}
	// name search
	if *name != "" {
	// don't use -name and any other search option
	if *imei != "" || *sn != "" || *status != "" {
	return "", errors.New("Error: cannot use -name and any other search options")
	}
	return "name", nil
	}
	// IMEI search
	if *imei != "" {
	// don't use -imei and any other search option
	if *name != "" || *sn != "" || *status != "" {
	return "", errors.New("Error: cannot use -imei and any other search options")
	}
	return "imei", nil
	}
	// Serial number search
	if *sn != "" {
	// don't use -sn and any other search option
	if *name != "" || *imei != "" || *status != "" {
	return "", errors.New("Error: cannot use -sn and any other search options")
	}
	return "sn", nil
	}
	// Status search
	if *status != "" {
	// don't use -status and any other search option
	if *name != "" || *imei != "" || *sn != "" {
	return "", errors.New("Error: cannot use -status and any other search options")
	}
	return "status", nil
	}
	// invalid search
	if *all == false && *name == "" && *imei == "" && *sn == "" && *status == "" {
	flag.PrintDefaults()
	return "", errors.New("Error: no search options specified")
	}
	return "", nil
	}
	// helper function to do a case-insensitive search
	func ciContains(a, b string) bool {
	return strings.Contains(strings.ToUpper(a), strings.ToUpper(b))
	}
	func main() {
	// check the flags to determine type of search
	searchtype, err := checkFlags()
	checkError(err)
	// read in the service account's JSON credentials file
	creds, err := ioutil.ReadFile(credsfile)
	checkError(err)
	// create JWT config from the service account's JSON credentials file
	jwtcfg, err := google.JWTConfigFromJSON(creds, scopes)
	checkError(err)
	// specify which admin user the API calls should "run as"
	jwtcfg.Subject = adminuser
	// make the client using our JWT config
	gc, err := admin.New(jwtcfg.Client(context.Background()))
	checkError(err)
	// get the data
	devices, err = gc.Mobiledevices.List(companyid).OrderBy(sortorder).Do()
	checkError(err)
	// iterate through the slice of devices
	for _, device := range devices.Mobiledevices {
	// what type of search are we doing?
	switch searchtype {
	// show all mobile devices
	case "all":
	row++
	printDeviceData(device)
	// name search: iterate through the slice of names associated with the device
	case "name":
	for _, username := range device.Name {
	// look for the specific user
	if ciContains(username, *name) {
	row++
	printDeviceData(device)
	}
	}
	// IMEI search: look for a specific IMEI
	case "imei":
	// remove all spaces from IMEI then search for specific IMEI
	// IMEI can be misreported via MDM with spaces, so remove them
	if strings.Replace(device.Imei, " ", "", –1) == strings.Replace(*imei, " ", "", –1) {
	row++
	printDeviceData(device)
	break
	}
	// serial number search: look for a specific serial number
	// SN can be misreported via MDM with spaces, so remove them
	case "sn":
	if strings.Replace(device.SerialNumber, " ", "", –1) == strings.Replace(*sn, " ", "", –1) {
	row++
	printDeviceData(device)
	break
	}
	// Status search
	case "status":
	if ciContains(device.Status, *status) {
	row++
	printDeviceData(device)
	}
	}
	}
	// if 0 rows returned, exit
	if row == 0 {
	log.Fatal("No mobile devices match specified search criteria")
	} else {
	// print the final/closing line of dashes
	printLine()
	}
	fmt.Printf("%d row(s) of mobile device data returned.\n", row)
	}
	// func to print out device data
	func printDeviceData(device *admin.MobileDevice) {
	// print header only on first row of data
	if row == 1 {
	printHeader()
	}
	// convert last sync string to time.Time so we can humanize the last sync timestamp
	t, err := time.Parse(time.RFC3339, device.LastSync)
	checkError(err)
	fmt.Printf("%-16.16s | %-14.14s | %-16.16s | %-18.18s | %-13.13s | %-18.18s | %-20.20s\n", device.Model, device.Os, strings.Replace(device.SerialNumber, " ", "", –1), strings.Replace(device.Imei, " ", "", –1), device.Status, humanize.Time(t), device.Name[0])
	return
	}
	// func to print a line
	func printLine() {
	// print a line
	fmt.Printf("—————–+—————-+——————+——————–+—————+——————–+—————\n")
	}
	// func to print the header
	func printHeader() {
	// print the first line of dashes
	printLine()
	// print header line
	fmt.Printf("Model | OS & Version | Serial # | IMEI | Status | Last Sync | Owner\n")
	// print a line of dashes under the header line
	printLine()
	}
	// EOF

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