rmmagent/agent/agent.go

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/*
Copyright 2022 AmidaWare LLC.
Licensed under the Tactical RMM License Version 1.0 (the License).
You may only use the Licensed Software in accordance with the License.
A copy of the License is available at:
https://license.tacticalrmm.com
*/
package agent
import (
"bytes"
"context"
"errors"
"fmt"
"io/ioutil"
"math"
"os"
"os/exec"
"path/filepath"
"runtime"
"strconv"
"strings"
"time"
rmm "github.com/amidaware/rmmagent/shared"
ps "github.com/elastic/go-sysinfo"
gocmd "github.com/go-cmd/cmd"
"github.com/go-resty/resty/v2"
"github.com/kardianos/service"
nats "github.com/nats-io/nats.go"
"github.com/shirou/gopsutil/v3/cpu"
"github.com/sirupsen/logrus"
trmm "github.com/wh1te909/trmm-shared"
)
// Agent struct
type Agent struct {
Hostname string
Arch string
AgentID string
BaseURL string
ApiURL string
Token string
AgentPK int
Cert string
ProgramDir string
EXE string
SystemDrive string
MeshInstaller string
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MeshSystemEXE string
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MeshSVC string
PyBin string
Headers map[string]string
Logger *logrus.Logger
Version string
Debug bool
rClient *resty.Client
Proxy string
LogTo string
LogFile *os.File
Platform string
GoArch string
ServiceConfig *service.Config
NatsServer string
NatsProxyPath string
NatsProxyPort string
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}
const (
progFilesName = "TacticalAgent"
winExeName = "tacticalrmm.exe"
winSvcName = "tacticalrmm"
meshSvcName = "mesh agent"
)
var natsCheckin = []string{"agent-hello", "agent-agentinfo", "agent-disks", "agent-winsvc", "agent-publicip", "agent-wmi"}
func New(logger *logrus.Logger, version string) *Agent {
host, _ := ps.Host()
info := host.Info()
pd := filepath.Join(os.Getenv("ProgramFiles"), progFilesName)
exe := filepath.Join(pd, winExeName)
sd := os.Getenv("SystemDrive")
var pybin string
switch runtime.GOARCH {
case "amd64":
pybin = filepath.Join(pd, "py38-x64", "python.exe")
case "386":
pybin = filepath.Join(pd, "py38-x32", "python.exe")
}
ac := NewAgentConfig()
headers := make(map[string]string)
if len(ac.Token) > 0 {
headers["Content-Type"] = "application/json"
headers["Authorization"] = fmt.Sprintf("Token %s", ac.Token)
}
restyC := resty.New()
restyC.SetBaseURL(ac.BaseURL)
restyC.SetCloseConnection(true)
restyC.SetHeaders(headers)
restyC.SetTimeout(15 * time.Second)
restyC.SetDebug(logger.IsLevelEnabled(logrus.DebugLevel))
if len(ac.Proxy) > 0 {
restyC.SetProxy(ac.Proxy)
}
if len(ac.Cert) > 0 {
restyC.SetRootCertificate(ac.Cert)
}
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var MeshSysExe string
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if len(ac.CustomMeshDir) > 0 {
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MeshSysExe = filepath.Join(ac.CustomMeshDir, "MeshAgent.exe")
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} else {
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MeshSysExe = filepath.Join(os.Getenv("ProgramFiles"), "Mesh Agent", "MeshAgent.exe")
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}
if runtime.GOOS == "linux" {
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MeshSysExe = "/opt/tacticalmesh/meshagent"
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}
svcConf := &service.Config{
Executable: exe,
Name: winSvcName,
DisplayName: "TacticalRMM Agent Service",
Arguments: []string{"-m", "svc"},
Description: "TacticalRMM Agent Service",
Option: service.KeyValue{
"StartType": "automatic",
"OnFailure": "restart",
"OnFailureDelayDuration": "5s",
"OnFailureResetPeriod": 10,
},
}
var natsProxyPath, natsProxyPort string
if ac.NatsProxyPath == "" {
natsProxyPath = "natsws"
}
if ac.NatsProxyPort == "" {
natsProxyPort = "443"
}
// check if using nats standard tcp, otherwise use nats websockets by default
var natsServer string
if ac.NatsStandardPort != "" {
natsServer = fmt.Sprintf("tls://%s:%s", ac.APIURL, ac.NatsStandardPort)
} else {
natsServer = fmt.Sprintf("wss://%s:%s", ac.APIURL, natsProxyPort)
}
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return &Agent{
Hostname: info.Hostname,
BaseURL: ac.BaseURL,
AgentID: ac.AgentID,
ApiURL: ac.APIURL,
Token: ac.Token,
AgentPK: ac.PK,
Cert: ac.Cert,
ProgramDir: pd,
EXE: exe,
SystemDrive: sd,
MeshInstaller: "meshagent.exe",
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MeshSystemEXE: MeshSysExe,
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MeshSVC: meshSvcName,
PyBin: pybin,
Headers: headers,
Logger: logger,
Version: version,
Debug: logger.IsLevelEnabled(logrus.DebugLevel),
rClient: restyC,
Proxy: ac.Proxy,
Platform: runtime.GOOS,
GoArch: runtime.GOARCH,
ServiceConfig: svcConf,
NatsServer: natsServer,
NatsProxyPath: natsProxyPath,
NatsProxyPort: natsProxyPort,
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}
}
type CmdStatus struct {
Status gocmd.Status
Stdout string
Stderr string
}
type CmdOptions struct {
Shell string
Command string
Args []string
Timeout time.Duration
IsScript bool
IsExecutable bool
Detached bool
}
func (a *Agent) NewCMDOpts() *CmdOptions {
return &CmdOptions{
Shell: "/bin/bash",
Timeout: 30,
}
}
func (a *Agent) CmdV2(c *CmdOptions) CmdStatus {
ctx, cancel := context.WithTimeout(context.Background(), c.Timeout*time.Second)
defer cancel()
// Disable output buffering, enable streaming
cmdOptions := gocmd.Options{
Buffered: false,
Streaming: true,
}
// have a child process that is in a different process group so that
// parent terminating doesn't kill child
if c.Detached {
cmdOptions.BeforeExec = []func(cmd *exec.Cmd){
func(cmd *exec.Cmd) {
cmd.SysProcAttr = SetDetached()
},
}
}
var envCmd *gocmd.Cmd
if c.IsScript {
envCmd = gocmd.NewCmdOptions(cmdOptions, c.Shell, c.Args...) // call script directly
} else if c.IsExecutable {
envCmd = gocmd.NewCmdOptions(cmdOptions, c.Shell, c.Command) // c.Shell: bin + c.Command: args as one string
} else {
envCmd = gocmd.NewCmdOptions(cmdOptions, c.Shell, "-c", c.Command) // /bin/bash -c 'ls -l /var/log/...'
}
var stdoutBuf bytes.Buffer
var stderrBuf bytes.Buffer
// Print STDOUT and STDERR lines streaming from Cmd
doneChan := make(chan struct{})
go func() {
defer close(doneChan)
// Done when both channels have been closed
// https://dave.cheney.net/2013/04/30/curious-channels
for envCmd.Stdout != nil || envCmd.Stderr != nil {
select {
case line, open := <-envCmd.Stdout:
if !open {
envCmd.Stdout = nil
continue
}
fmt.Fprintln(&stdoutBuf, line)
a.Logger.Debugln(line)
case line, open := <-envCmd.Stderr:
if !open {
envCmd.Stderr = nil
continue
}
fmt.Fprintln(&stderrBuf, line)
a.Logger.Debugln(line)
}
}
}()
// Run and wait for Cmd to return, discard Status
envCmd.Start()
go func() {
select {
case <-doneChan:
return
case <-ctx.Done():
a.Logger.Debugf("Command timed out after %d seconds\n", c.Timeout)
pid := envCmd.Status().PID
a.Logger.Debugln("Killing process with PID", pid)
KillProc(int32(pid))
}
}()
// Wait for goroutine to print everything
<-doneChan
ret := CmdStatus{
Status: envCmd.Status(),
Stdout: CleanString(stdoutBuf.String()),
Stderr: CleanString(stderrBuf.String()),
}
a.Logger.Debugf("%+v\n", ret)
return ret
}
func (a *Agent) GetCPULoadAvg() int {
fallback := false
pyCode := `
import psutil
try:
print(int(round(psutil.cpu_percent(interval=10))), end='')
except:
print("pyerror", end='')
`
pypercent, err := a.RunPythonCode(pyCode, 13, []string{})
if err != nil || pypercent == "pyerror" {
fallback = true
}
i, err := strconv.Atoi(pypercent)
if err != nil {
fallback = true
}
if fallback {
percent, err := cpu.Percent(10*time.Second, false)
if err != nil {
a.Logger.Debugln("Go CPU Check:", err)
return 0
}
return int(math.Round(percent[0]))
}
return i
}
// ForceKillMesh kills all mesh agent related processes
func (a *Agent) ForceKillMesh() {
pids := make([]int, 0)
procs, err := ps.Processes()
if err != nil {
return
}
for _, process := range procs {
p, err := process.Info()
if err != nil {
continue
}
if strings.Contains(strings.ToLower(p.Name), "meshagent") {
pids = append(pids, p.PID)
}
}
for _, pid := range pids {
a.Logger.Debugln("Killing mesh process with pid %d", pid)
if err := KillProc(int32(pid)); err != nil {
a.Logger.Debugln(err)
}
}
}
func (a *Agent) SyncMeshNodeID() {
id, err := a.getMeshNodeID()
if err != nil {
a.Logger.Errorln("SyncMeshNodeID() getMeshNodeID()", err)
return
}
payload := rmm.MeshNodeID{
Func: "syncmesh",
Agentid: a.AgentID,
NodeID: StripAll(id),
}
_, err = a.rClient.R().SetBody(payload).Post("/api/v3/syncmesh/")
if err != nil {
a.Logger.Debugln("SyncMesh:", err)
}
}
func (a *Agent) setupNatsOptions() []nats.Option {
opts := make([]nats.Option, 0)
opts = append(opts, nats.Name("TacticalRMM"))
opts = append(opts, nats.UserInfo(a.AgentID, a.Token))
opts = append(opts, nats.ReconnectWait(time.Second*5))
opts = append(opts, nats.RetryOnFailedConnect(true))
opts = append(opts, nats.MaxReconnects(-1))
opts = append(opts, nats.ReconnectBufSize(-1))
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opts = append(opts, nats.ProxyPath(a.NatsProxyPath))
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return opts
}
func (a *Agent) GetUninstallExe() string {
cderr := os.Chdir(a.ProgramDir)
if cderr == nil {
files, err := filepath.Glob("unins*.exe")
if err == nil {
for _, f := range files {
if strings.Contains(f, "001") {
return f
}
}
}
}
return "unins000.exe"
}
func (a *Agent) CleanupAgentUpdates() {
cderr := os.Chdir(a.ProgramDir)
if cderr != nil {
a.Logger.Errorln(cderr)
return
}
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// winagent-v* is deprecated
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files, err := filepath.Glob("winagent-v*.exe")
if err == nil {
for _, f := range files {
os.Remove(f)
}
}
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agents, err := filepath.Glob("tacticalagent-v*.exe")
if err == nil {
for _, f := range agents {
os.Remove(f)
}
}
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cderr = os.Chdir(os.Getenv("TMP"))
if cderr != nil {
a.Logger.Errorln(cderr)
return
}
folders, err := filepath.Glob("tacticalrmm*")
if err == nil {
for _, f := range folders {
os.RemoveAll(f)
}
}
}
func (a *Agent) RunPythonCode(code string, timeout int, args []string) (string, error) {
content := []byte(code)
dir, err := ioutil.TempDir("", "tacticalpy")
if err != nil {
a.Logger.Debugln(err)
return "", err
}
defer os.RemoveAll(dir)
tmpfn, _ := ioutil.TempFile(dir, "*.py")
if _, err := tmpfn.Write(content); err != nil {
a.Logger.Debugln(err)
return "", err
}
if err := tmpfn.Close(); err != nil {
a.Logger.Debugln(err)
return "", err
}
ctx, cancel := context.WithTimeout(context.Background(), time.Duration(timeout)*time.Second)
defer cancel()
var outb, errb bytes.Buffer
cmdArgs := []string{tmpfn.Name()}
if len(args) > 0 {
cmdArgs = append(cmdArgs, args...)
}
a.Logger.Debugln(cmdArgs)
cmd := exec.CommandContext(ctx, a.PyBin, cmdArgs...)
cmd.Stdout = &outb
cmd.Stderr = &errb
cmdErr := cmd.Run()
if ctx.Err() == context.DeadlineExceeded {
a.Logger.Debugln("RunPythonCode:", ctx.Err())
return "", ctx.Err()
}
if cmdErr != nil {
a.Logger.Debugln("RunPythonCode:", cmdErr)
return "", cmdErr
}
if errb.String() != "" {
a.Logger.Debugln(errb.String())
return errb.String(), errors.New("RunPythonCode stderr")
}
return outb.String(), nil
}
func (a *Agent) CreateTRMMTempDir() {
// create the temp dir for running scripts
dir := filepath.Join(os.TempDir(), "trmm")
if !trmm.FileExists(dir) {
err := os.Mkdir(dir, 0775)
if err != nil {
a.Logger.Errorln(err)
}
}
}