// issueKillAction issues an `agentdestroy` action targeted to a specific agent
// and updates the status of the agent in the database
func issueKillAction(agent mig.Agent, ctx Context) (err error) {
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("issueKillAction() -> %v", e)
}
ctx.Channels.Log <- mig.Log{OpID: ctx.OpID, Desc: "leaving issueKillAction()"}.Debug()
}()
// generate an `agentdestroy` action for this agent
killAction := mig.Action{
ID: mig.GenID(),
Name: fmt.Sprintf("Kill agent %s", agent.Name),
Target: fmt.Sprintf("queueloc='%s'", agent.QueueLoc),
ValidFrom: time.Now().Add(-60 * time.Second).UTC(),
ExpireAfter: time.Now().Add(30 * time.Minute).UTC(),
SyntaxVersion: 2,
}
var opparams struct {
PID int `json:"pid"`
Version string `json:"version"`
}
opparams.PID = agent.PID
opparams.Version = agent.Version
killOperation := mig.Operation{
Module: "agentdestroy",
Parameters: opparams,
}
killAction.Operations = append(killAction.Operations, killOperation)
// sign the action with the scheduler PGP key
secring, err := getSecring(ctx)
if err != nil {
panic(err)
}
pgpsig, err := killAction.Sign(ctx.PGP.PrivKeyID, secring)
if err != nil {
panic(err)
}
killAction.PGPSignatures = append(killAction.PGPSignatures, pgpsig)
var jsonAction []byte
jsonAction, err = json.Marshal(killAction)
if err != nil {
panic(err)
}
// write the action to the spool for scheduling
dest := fmt.Sprintf("%s/%.0f.json", ctx.Directories.Action.New, killAction.ID)
err = safeWrite(ctx, dest, jsonAction)
if err != nil {
panic(err)
}
// mark the agent as `destroyed` in the database
err = ctx.DB.MarkAgentDestroyed(agent)
if err != nil {
panic(err)
}
ctx.Channels.Log <- mig.Log{Desc: fmt.Sprintf("issued kill action for agent '%s' "+
"with PID '%d'", agent.Name, agent.PID)}.Warning()
return
}
func main() {
var (
conf client.Configuration
cli client.Client
err error
op mig.Operation
a mig.Action
migrc, show, render, target, expiration, afile string
verbose bool
modargs []string
run interface{}
)
defer func() {
if e := recover(); e != nil {
fmt.Fprintf(os.Stderr, "%v\n", e)
}
}()
homedir := client.FindHomedir()
fs := flag.NewFlagSet("mig flag", flag.ContinueOnError)
fs.Usage = continueOnFlagError
fs.StringVar(&migrc, "c", homedir+"/.migrc", "alternative configuration file")
fs.StringVar(&show, "show", "found", "type of results to show")
fs.StringVar(&render, "render", "text", "results rendering mode")
fs.StringVar(&target, "t", fmt.Sprintf("status='%s' AND mode='daemon'", mig.AgtStatusOnline), "action target")
fs.StringVar(&expiration, "e", "300s", "expiration")
fs.StringVar(&afile, "i", "/path/to/file", "Load action from file")
fs.BoolVar(&verbose, "v", false, "Enable verbose output")
// if first argument is missing, or is help, print help
// otherwise, pass the remainder of the arguments to the module for parsing
// this client is agnostic to module parameters
if len(os.Args) < 2 || os.Args[1] == "help" || os.Args[1] == "-h" || os.Args[1] == "--help" {
usage()
}
if len(os.Args) < 2 || os.Args[1] == "-V" {
fmt.Println(version)
os.Exit(0)
}
// when reading the action from a file, go directly to launch
if os.Args[1] == "-i" {
err = fs.Parse(os.Args[1:])
if err != nil {
panic(err)
}
if afile == "/path/to/file" {
panic("-i flag must take an action file path as argument")
}
a, err = mig.ActionFromFile(afile)
if err != nil {
panic(err)
}
fmt.Fprintf(os.Stderr, "[info] launching action from file, all flags are ignored\n")
goto readytolaunch
}
// arguments parsing works as follow:
// * os.Args[1] must contain the name of the module to launch. we first verify
// that a module exist for this name and then continue parsing
// * os.Args[2:] contains both global options and module parameters. We parse the
// whole []string to extract global options, and module parameters will be left
// unparsed in fs.Args()
// * fs.Args() with the module parameters is passed as a string to the module parser
// which will return a module operation to store in the action
op.Module = os.Args[1]
if _, ok := modules.Available[op.Module]; !ok {
panic("Unknown module " + op.Module)
}
// -- Ugly hack Warning --
// Parse() will fail on the first flag that is not defined, but in our case module flags
// are defined in the module packages and not in this program. Therefore, the flag parse error
// is expected. Unfortunately, Parse() writes directly to stderr and displays the error to
// the user, which confuses them. The right fix would be to prevent Parse() from writing to
// stderr, since that's really the job of the calling program, but in the meantime we work around
// it by redirecting stderr to null before calling Parse(), and put it back to normal afterward.
// for ref, issue is at https://github.com/golang/go/blob/master/src/flag/flag.go#L793
fs.SetOutput(os.NewFile(uintptr(87592), os.DevNull))
err = fs.Parse(os.Args[2:])
fs.SetOutput(nil)
if err != nil {
// ignore the flag not defined error, which is expected because
// module parameters are defined in modules and not in main
if len(err.Error()) > 30 && err.Error()[0:29] == "flag provided but not defined" {
// requeue the parameter that failed
modargs = append(modargs, err.Error()[31:])
} else {
// if it's another error, panic
panic(err)
}
}
for _, arg := range fs.Args() {
modargs = append(modargs, arg)
}
run = modules.Available[op.Module].NewRun()
if _, ok := run.(modules.HasParamsParser); !ok {
fmt.Fprintf(os.Stderr, "[error] module '%s' does not support command line invocation\n", op.Module)
os.Exit(2)
}
op.Parameters, err = run.(modules.HasParamsParser).ParamsParser(modargs)
if err != nil || op.Parameters == nil {
panic(err)
}
// If running against the local target, don't post the action to the MIG API
// but run it locally instead.
if target == "local" {
msg, err := modules.MakeMessage(modules.MsgClassParameters, op.Parameters)
if err != nil {
panic(err)
}
out := run.(modules.Runner).Run(bytes.NewBuffer(msg))
if len(out) == 0 {
panic("got empty results, run failed")
}
if _, ok := run.(modules.HasResultsPrinter); ok {
var modres modules.Result
err := json.Unmarshal([]byte(out), &modres)
if err != nil {
panic(err)
}
outRes, err := run.(modules.HasResultsPrinter).PrintResults(modres, true)
if err != nil {
panic(err)
}
for _, resLine := range outRes {
fmt.Println(resLine)
}
} else {
out = fmt.Sprintf("%s\n", out)
}
os.Exit(0)
}
a.Operations = append(a.Operations, op)
for _, arg := range os.Args[1:] {
a.Name += arg + " "
}
a.Target = target
readytolaunch:
// instanciate an API client
conf, err = client.ReadConfiguration(migrc)
if err != nil {
panic(err)
}
cli, err = client.NewClient(conf, "cmd-"+version)
if err != nil {
panic(err)
}
if verbose {
cli.EnableDebug()
}
// set the validity 60 second in the past to deal with clock skew
a.ValidFrom = time.Now().Add(-60 * time.Second).UTC()
period, err := time.ParseDuration(expiration)
if err != nil {
panic(err)
}
a.ExpireAfter = a.ValidFrom.Add(period)
// add extra 60 seconds taken for clock skew
a.ExpireAfter = a.ExpireAfter.Add(60 * time.Second).UTC()
asig, err := cli.SignAction(a)
if err != nil {
panic(err)
}
a = asig
// evaluate target before launch, give a change to cancel before going out to agents
agents, err := cli.EvaluateAgentTarget(a.Target)
if err != nil {
panic(err)
}
fmt.Fprintf(os.Stderr, "\x1b[33m%d agents will be targeted. ctrl+c to cancel. launching in \x1b[0m", len(agents))
for i := 5; i > 0; i-- {
time.Sleep(1 * time.Second)
fmt.Fprintf(os.Stderr, "\x1b[33m%d\x1b[0m ", i)
}
fmt.Fprintf(os.Stderr, "\x1b[33mGO\n\x1b[0m")
// launch and follow
a, err = cli.PostAction(a)
if err != nil {
panic(err)
}
c := make(chan os.Signal, 1)
done := make(chan bool, 1)
signal.Notify(c, os.Interrupt)
go func() {
err = cli.FollowAction(a)
if err != nil {
panic(err)
}
done <- true
}()
select {
case <-c:
fmt.Fprintf(os.Stderr, "stop following action. agents may still be running. printing available results:\n")
goto printresults
case <-done:
goto printresults
}
printresults:
err = cli.PrintActionResults(a, show, render)
if err != nil {
panic(err)
}
}
// actionLauncher prepares an action for launch, either by starting with an empty
// template, or by loading an existing action from the api or the local disk
func actionLauncher(tpl mig.Action, cli client.Client) (err error) {
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("actionLauncher() -> %v", e)
}
}()
var a mig.Action
if tpl.ID == 0 {
fmt.Println("Entering action launcher with empty template")
} else {
// reinit the fields that we don't reuse
a.Name = tpl.Name
a.Target = tpl.Target
a.Description = tpl.Description
a.Threat = tpl.Threat
a.Operations = tpl.Operations
fmt.Printf("Entering action launcher using template '%s'\n", a.Name)
}
hasTimes := false
hasSignatures := false
hasEvaluatedTarget := false
fmt.Println("Type \x1b[32;1mexit\x1b[0m or press \x1b[32;1mctrl+d\x1b[0m to leave. \x1b[32;1mhelp\x1b[0m may help.")
prompt := "\x1b[33;1mlauncher>\x1b[0m "
for {
// completion
var symbols = []string{"addoperation", "deloperation", "exit", "help", "init",
"json", "launch", "listagents", "load", "details", "filechecker", "netstat",
"setname", "settarget", "settimes", "sign", "times"}
readline.Completer = func(query, ctx string) []string {
var res []string
for _, sym := range symbols {
if strings.HasPrefix(sym, query) {
res = append(res, sym)
}
}
return res
}
input, err := readline.String(prompt)
if err == io.EOF {
break
}
if err != nil {
fmt.Println("error: ", err)
break
}
orders := strings.Split(strings.TrimSpace(input), " ")
switch orders[0] {
case "addoperation":
if len(orders) != 2 {
fmt.Println("Wrong arguments. Expects 'addoperation <module_name>'")
fmt.Println("example: addoperation filechecker")
break
}
// attempt to call ParamsCreator from the requested module
// ParamsCreator takes care of retrieving using input
var operation mig.Operation
operation.Module = orders[1]
if _, ok := modules.Available[operation.Module]; ok {
// instanciate and call module parameters creation function
run := modules.Available[operation.Module].NewRun()
if _, ok := run.(modules.HasParamsCreator); !ok {
fmt.Println(operation.Module, "module does not provide a parameters creator.")
fmt.Println("You can write your action by hand and import it using 'load <file>'")
break
}
operation.Parameters, err = run.(modules.HasParamsCreator).ParamsCreator()
if err != nil {
fmt.Printf("Parameters creation failed with error: %v\n", err)
break
}
a.Operations = append(a.Operations, operation)
opjson, err := json.MarshalIndent(operation, "", " ")
if err != nil {
panic(err)
}
fmt.Printf("Inserting %s operation with parameters:\n%s\n", operation.Module, opjson)
} else {
fmt.Println("Module", operation.Module, "is not available in this console...")
fmt.Println("You can write your action by hand and import it using 'load <file>'")
}
case "deloperation":
if len(orders) != 2 {
fmt.Println("Wrong arguments. Expects 'deloperation <opnum>'")
fmt.Println("example: deloperation 0")
break
}
opnum, err := strconv.Atoi(orders[1])
if err != nil || opnum < 0 || opnum > len(a.Operations)-1 {
fmt.Println("error: <opnum> must be a positive integer between 0 and", len(a.Operations)-1)
break
}
a.Operations = append(a.Operations[:opnum], a.Operations[opnum+1:]...)
case "details":
fmt.Printf("ID %.0f\nName %s\nTarget %s\nAuthor %s <%s>\n"+
"Revision %.0f\nURL %s\nThreat Type %s, Level %s, Family %s, Reference %s\n",
a.ID, a.Name, a.Target, a.Description.Author, a.Description.Email,
a.Description.Revision, a.Description.URL,
a.Threat.Type, a.Threat.Level, a.Threat.Family, a.Threat.Ref)
fmt.Printf("%d operations: ", len(a.Operations))
for i, op := range a.Operations {
fmt.Printf("%d=%s; ", i, op.Module)
}
fmt.Printf("\n")
case "exit":
fmt.Printf("exit\n")
goto exit
case "help":
fmt.Printf(`The following orders are available:
addoperation <module> append a new operation of type <module> to the action operations
listagents list agents targetted by an action
deloperation <opnum> remove operation numbered <opnum> from operations array, count starts at zero
details display the action details
exit exit this mode
help show this help
json <pack> show the json of the action
launch <nofollow> launch the action. to return before completion, add "nofollow"
load <path> load an action from a file at <path>
setname <name> set the name of the action
settarget <target> set the target
settimes <start> <stop> set the validity and expiration dates
sign PGP sign the action
times show the various timestamps of the action
`)
case "json":
pack := false
if len(orders) > 1 {
if orders[1] == "pack" {
pack = true
} else {
fmt.Printf("Unknown option '%s'\n", orders[1])
}
}
var ajson []byte
if pack {
ajson, err = json.Marshal(a)
} else {
ajson, err = json.MarshalIndent(a, "", " ")
}
if err != nil {
panic(err)
}
fmt.Printf("%s\n", ajson)
case "launch":
follow := true
if len(orders) > 1 {
if orders[1] == "nofollow" {
follow = false
} else {
fmt.Printf("Unknown option '%s'\n", orders[1])
}
}
if a.Name == "" {
fmt.Println("Action has no name. Define one using 'setname <name>'")
break
}
if a.Target == "" {
fmt.Println("Action has no target. Define one using 'settarget <target>'")
break
}
if !hasEvaluatedTarget {
agents, err := cli.EvaluateAgentTarget(a.Target)
if err != nil {
panic(err)
}
count := len(agents)
if count == 0 {
fmt.Println("0 agents match this target. launch aborted")
break
}
fmt.Printf("%d agents will be targeted by search \"%s\"\n", count, a.Target)
input, err = readline.String("continue? (y/n)> ")
if err != nil {
panic(err)
}
if input != "y" {
fmt.Println("launch aborted")
break
}
}
if !hasTimes {
fmt.Printf("Times are not defined. Setting validity from now until +%s\n", defaultExpiration)
// for immediate execution, set validity one minute in the past
a.ValidFrom = time.Now().Add(-60 * time.Second).UTC()
period, err := time.ParseDuration(defaultExpiration)
if err != nil {
panic(err)
}
a.ExpireAfter = a.ValidFrom.Add(period)
a.ExpireAfter = a.ExpireAfter.Add(60 * time.Second).UTC()
hasTimes = true
}
if !hasSignatures {
asig, err := cli.SignAction(a)
if err != nil {
panic(err)
}
a = asig
hasSignatures = true
}
a, err = cli.PostAction(a)
if err != nil {
panic(err)
}
fmt.Printf("Action '%s' successfully launched with ID '%.0f' on target '%s'\n",
a.Name, a.ID, a.Target)
if follow {
err = cli.FollowAction(a)
if err != nil {
panic(err)
}
}
fmt.Println("")
_ = actionReader(fmt.Sprintf("action %.0f", a.ID), cli)
goto exit
case "listagents":
agents, err := cli.EvaluateAgentTarget(a.Target)
if err != nil {
fmt.Println(err)
break
}
fmt.Println("---- ID ---- + ---- Name -------")
for _, agt := range agents {
fmt.Printf("%20.0f %s\n", agt.ID, agt.Name)
}
case "load":
if len(orders) != 2 {
fmt.Println("Wrong arguments. Expects 'load <path_to_file>'")
break
}
a, err = mig.ActionFromFile(orders[1])
if err != nil {
panic(err)
}
fmt.Printf("Loaded action '%s' from %s\n", a.Name, orders[1])
case "sign":
if !hasTimes {
fmt.Println("Times must be set prior to signing")
break
}
asig, err := cli.SignAction(a)
if err != nil {
panic(err)
}
a = asig
hasSignatures = true
case "setname":
if len(orders) < 2 {
fmt.Println("Wrong arguments. Must be 'setname <some_name>'")
break
}
a.Name = strings.Join(orders[1:], " ")
case "settarget":
if len(orders) < 2 {
fmt.Println("Wrong arguments. Must be 'settarget <some_target_string>'")
break
}
a.Target = strings.Join(orders[1:], " ")
agents, err := cli.EvaluateAgentTarget(a.Target)
if err != nil {
fmt.Println(err)
break
}
fmt.Printf("%d agents will be targetted. To get the list, use 'listagents'\n", len(agents))
hasEvaluatedTarget = true
case "settimes":
// set the dates
if len(orders) != 3 {
fmt.Println(`Invalid times. Expects settimes <start> <stop.)
examples:
settimes 2014-06-30T12:00:00.0Z 2014-06-30T14:00:00.0Z
settimes now +60m
`)
break
}
if orders[1] == "now" {
// for immediate execution, set validity one minute in the past
a.ValidFrom = time.Now().Add(-60 * time.Second).UTC()
period, err := time.ParseDuration(orders[2])
if err != nil {
fmt.Println("Failed to parse duration '%s': %v", orders[2], err)
break
}
a.ExpireAfter = a.ValidFrom.Add(period)
a.ExpireAfter = a.ExpireAfter.Add(60 * time.Second).UTC()
} else {
a.ValidFrom, err = time.Parse("2014-01-01T00:00:00.0Z", orders[1])
if err != nil {
fmt.Println("Failed to parse time '%s': %v", orders[1], err)
break
}
a.ExpireAfter, err = time.Parse("2014-01-01T00:00:00.0Z", orders[2])
if err != nil {
fmt.Println("Failed to parse time '%s': %v", orders[2], err)
break
}
}
hasTimes = true
case "times":
fmt.Printf("Valid from '%s' until '%s'\nStarted on '%s'\n"+
"Last updated '%s'\nFinished on '%s'\n",
a.ValidFrom, a.ExpireAfter, a.StartTime, a.LastUpdateTime, a.FinishTime)
case "":
break
default:
fmt.Printf("Unknown order '%s'. You are in action launcher mode. Try `help`.\n", orders[0])
}
readline.AddHistory(input)
}
exit:
fmt.Printf("\n")
return
}