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start.go
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start.go
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// Copyright (C) 2022 Specter Ops, Inc.
//
// This file is part of AzureHound.
//
// AzureHound is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// AzureHound is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package cmd
import (
"context"
"encoding/json"
"fmt"
"net/http"
"net/url"
"os"
"os/signal"
"runtime"
"sort"
"time"
"github.com/bloodhoundad/azurehound/client/rest"
"github.com/bloodhoundad/azurehound/config"
"github.com/bloodhoundad/azurehound/constants"
"github.com/bloodhoundad/azurehound/models"
"github.com/bloodhoundad/azurehound/pipeline"
"github.com/spf13/cobra"
)
const (
BHEAuthSignature string = "bhesignature"
)
func init() {
configs := append(config.AzureConfig, config.BloodHoundEnterpriseConfig...)
config.Init(startCmd, configs)
rootCmd.AddCommand(startCmd)
}
var startCmd = &cobra.Command{
Use: "start",
Short: "Start Azure data collection",
Run: startCmdImpl,
PersistentPreRunE: persistentPreRunE,
SilenceUsage: true,
}
func startCmdImpl(cmd *cobra.Command, args []string) {
start(cmd.Context())
}
func start(ctx context.Context) {
ctx, stop := signal.NotifyContext(ctx, os.Interrupt, os.Kill)
sigChan := make(chan os.Signal)
go func() {
stacktrace := make([]byte, 8192)
for range sigChan {
length := runtime.Stack(stacktrace, true)
fmt.Println(string(stacktrace[:length]))
}
}()
defer gracefulShutdown(stop)
log.V(1).Info("testing connections")
if err := testConnections(); err != nil {
exit(err)
} else if azClient, err := newAzureClient(); err != nil {
exit(err)
} else if bheInstance, err := url.Parse(config.BHEUrl.Value().(string)); err != nil {
exit(err)
} else if bheClient, err := newSigningHttpClient(BHEAuthSignature, config.BHETokenId.Value().(string), config.BHEToken.Value().(string), config.Proxy.Value().(string)); err != nil {
exit(err)
} else {
if err := updateClient(ctx, *bheInstance, bheClient); err != nil {
exit(err)
}
log.Info("connected successfully! waiting for tasks...")
ticker := time.NewTicker(5 * time.Second)
defer ticker.Stop()
var currentTask *models.ClientTask
for {
select {
case <-ticker.C:
if currentTask != nil {
log.V(1).Info("curently performing collection; continuing...")
} else {
log.V(2).Info("checking for available collection tasks")
if availableTasks, err := getAvailableTasks(ctx, *bheInstance, bheClient); err != nil {
log.Error(err, "unable to fetch available tasks for azurehound")
} else {
// Get only the tasks that have reached their execution time
executableTasks := []models.ClientTask{}
now := time.Now()
for _, task := range availableTasks {
if task.ExectionTime.Before(now) || task.ExectionTime.Equal(now) {
executableTasks = append(executableTasks, task)
}
}
// Sort tasks in ascending order by execution time
sort.Slice(executableTasks, func(i, j int) bool {
return executableTasks[i].ExectionTime.Before(executableTasks[j].ExectionTime)
})
if len(executableTasks) == 0 {
log.V(2).Info("there are no tasks for azurehound to complete at this time")
} else {
// Notify BHE instance of task start
currentTask = &executableTasks[0]
startTask(ctx, *bheInstance, bheClient, currentTask.Id)
start := time.Now()
// Batch data out for ingestion
stream := listAll(ctx, azClient)
batches := pipeline.Batch(ctx.Done(), stream, 999, 10*time.Second)
ingest(ctx, *bheInstance, bheClient, batches)
// Notify BHE instance of task end
duration := time.Since(start)
endTask(ctx, *bheInstance, bheClient)
log.Info("finished collection task", "id", currentTask.Id, "duration", duration.String())
currentTask = nil
}
}
}
case <-ctx.Done():
return
}
}
}
}
func ingest(ctx context.Context, bheUrl url.URL, bheClient *http.Client, in <-chan []interface{}) {
endpoint := bheUrl.ResolveReference(&url.URL{Path: "/api/v1/ingest"})
for data := range pipeline.OrDone(ctx.Done(), in) {
body := models.IngestRequest{
Meta: models.Meta{
Type: "azure",
},
Data: data,
}
if req, err := rest.NewRequest(ctx, "POST", endpoint, body, nil, nil); err != nil {
log.Error(err, "unable to create request")
} else if _, err := bheClient.Do(req); err != nil {
log.Error(err, "unable to send data to bloodhound enterprise", "bheUrl", bheUrl)
}
}
}
func getAvailableTasks(ctx context.Context, bheUrl url.URL, bheClient *http.Client) ([]models.ClientTask, error) {
var (
endpoint = bheUrl.ResolveReference(&url.URL{Path: "/api/v1/clients/availabletasks"})
response []models.ClientTask
)
if req, err := rest.NewRequest(ctx, "GET", endpoint, nil, nil, nil); err != nil {
return nil, err
} else if res, err := bheClient.Do(req); err != nil {
return nil, err
} else if err := json.NewDecoder(res.Body).Decode(&response); err != nil {
return nil, err
} else {
return response, nil
}
}
func startTask(ctx context.Context, bheUrl url.URL, bheClient *http.Client, taskId int) error {
log.Info("beginning collection task", "id", taskId)
var (
endpoint = bheUrl.ResolveReference(&url.URL{Path: "/api/v1/clients/starttask"})
body = map[string]int{
"id": taskId,
}
)
if req, err := rest.NewRequest(ctx, "POST", endpoint, body, nil, nil); err != nil {
return err
} else if _, err := bheClient.Do(req); err != nil {
return err
} else {
return nil
}
}
func endTask(ctx context.Context, bheUrl url.URL, bheClient *http.Client) error {
endpoint := bheUrl.ResolveReference(&url.URL{Path: "/api/v1/clients/endtask"})
if req, err := rest.NewRequest(ctx, "POST", endpoint, nil, nil, nil); err != nil {
return err
} else if _, err := bheClient.Do(req); err != nil {
return err
} else {
return nil
}
}
func updateClient(ctx context.Context, bheUrl url.URL, bheClient *http.Client) error {
endpoint := bheUrl.ResolveReference(&url.URL{Path: "/api/v1/clients/update"})
if addr, err := dial(bheUrl.String()); err != nil {
return err
} else {
// hostname is nice to have but we don't really need it
hostname, _ := os.Hostname()
body := models.UpdateClientRequest{
Address: addr,
Hostname: hostname,
Version: constants.Version,
}
log.V(2).Info("updating client info", "info", body)
if req, err := rest.NewRequest(ctx, "PUT", endpoint, body, nil, nil); err != nil {
return err
} else if res, err := bheClient.Do(req); err != nil {
return err
} else {
var body json.RawMessage
defer res.Body.Close()
if err := json.NewDecoder(res.Body).Decode(&body); err != nil {
return err
} else if res.StatusCode < 200 || res.StatusCode >= 400 {
return fmt.Errorf(string(body))
} else {
return nil
}
}
}
}