func computeSignature(a mig.Action, ctx Context) (pgpsig string, err error) {
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("computeSignature() -> %v", e)
}
}()
// do a round trip through the json marshaller, this is voodoo that
// fixes signature verification issues down the road
b, err := json.Marshal(a)
if err != nil {
panic(err)
}
err = json.Unmarshal(b, &a)
if err != nil {
panic(err)
}
secringFile, err := os.Open(ctx.GPG.Home + "/secring.gpg")
if err != nil {
panic(err)
}
defer secringFile.Close()
// compute the signature
str, err := a.String()
if err != nil {
panic(err)
}
pgpsig, err = sign.Sign(str, ctx.GPG.KeyID, secringFile)
if err != nil {
panic(err)
}
fmt.Println("Signature computed successfully")
return
}
func main() {
var Usage = func() {
fmt.Fprintf(os.Stderr,
"Mozilla InvestiGator Action Generator\n"+
"usage: %s -k=<key id> (-i <input file)\n\n"+
"Command line to generate and sign MIG Actions.\n"+
"The resulting actions are display on stdout.\n\n"+
"Options:\n",
os.Args[0])
flag.PrintDefaults()
}
// command line options
var key = flag.String("k", "key identifier", "Key identifier used to sign the action (ex: B75C2346)")
var pretty = flag.Bool("p", false, "Print signed action in pretty JSON format")
var urlencode = flag.Bool("urlencode", false, "URL Encode marshalled JSON before output")
var posturl = flag.String("posturl", "", "POST action to <url> (enforces urlencode)")
var file = flag.String("i", "/path/to/file", "Load action from file")
var validfrom = flag.String("validfrom", "now", "(optional) set an ISO8601 date the action will be valid from. If unset, use 'now'.")
var expireafter = flag.String("expireafter", "30m", "(optional) set a validity duration for the action. If unset, use '30m'.")
flag.Parse()
// We need a key, if none is set on the command line, fail
if *key == "key identifier" {
Usage()
os.Exit(-1)
}
var a mig.Action
var err error
// if a file is defined, load action from that
if *file != "/path/to/file" {
a, err = mig.ActionFromFile(*file)
} else {
// otherwise, use interactive mode
a, err = getActionFromTerminal()
}
if err != nil {
panic(err)
}
// set the dates
if *validfrom == "now" {
a.ValidFrom = time.Now().UTC()
} else {
a.ValidFrom, err = time.Parse("2014-01-01T00:00:00.0Z", *validfrom)
if err != nil {
panic(err)
}
}
period, err := time.ParseDuration(*expireafter)
if err != nil {
log.Fatal(err)
}
a.ExpireAfter = a.ValidFrom.Add(period)
// compute the signature
str, err := a.String()
if err != nil {
panic(err)
}
a.PGPSignature, err = sign.Sign(str, *key)
if err != nil {
panic(err)
}
a.PGPSignatureDate = time.Now().UTC()
var jsonAction []byte
if *pretty {
jsonAction, err = json.MarshalIndent(a, "", "\t")
} else {
jsonAction, err = json.Marshal(a)
}
if err != nil {
panic(err)
}
// if asked, url encode the action before marshaling it
actionstr := string(jsonAction)
if *urlencode {
strJsonAction := string(jsonAction)
actionstr = url.QueryEscape(strJsonAction)
}
if *posturl != "" {
resp, err := http.PostForm(*posturl, url.Values{"action": {actionstr}})
if err != nil {
panic(err)
}
var buf [512]byte
reader := resp.Body
for {
n, err := reader.Read(buf[0:])
if err != nil {
os.Exit(0)
}
fmt.Print(string(buf[0:n]))
}
}
// find keyring in default location
u, err := user.Current()
if err != nil {
panic(err)
}
// load keyring
var gnupghome string
gnupghome = os.Getenv("GNUPGHOME")
if gnupghome == "" {
gnupghome = "/.gnupg"
}
keyring, err := os.Open(u.HomeDir + gnupghome + "/pubring.gpg")
if err != nil {
panic(err)
}
defer keyring.Close()
// syntax checking
err = a.Validate()
if err != nil {
panic(err)
}
// syntax checking
err = a.VerifySignature(keyring)
if err != nil {
panic(err)
}
}
// processNewAction is called when a new action is available. It pulls
// the action from the directory, parse it, retrieve a list of targets from
// the backend database, and create individual command for each target.
func processNewAction(actionPath string, ctx Context) (err error) {
var action mig.Action
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("processNewAction() -> %v", e)
}
ctx.Channels.Log <- mig.Log{OpID: ctx.OpID, ActionID: action.ID, Desc: "leaving processNewAction()"}.Debug()
}()
// load the action file
action, err = mig.ActionFromFile(actionPath)
if err != nil {
panic(err)
}
action.StartTime = time.Now()
// generate an action id
if action.ID < 1 {
action.ID = mig.GenID()
}
desc := fmt.Sprintf("new action received: Name='%s' Target='%s' ValidFrom='%s' ExpireAfter='%s'",
action.Name, action.Target, action.ValidFrom, action.ExpireAfter)
ctx.Channels.Log <- mig.Log{OpID: ctx.OpID, ActionID: action.ID, Desc: desc}
// TODO: replace with action.Validate(), to include signature verification
if time.Now().Before(action.ValidFrom) {
// queue new action
desc := fmt.Sprintf("action '%s' is not ready for scheduling", action.Name)
ctx.Channels.Log <- mig.Log{OpID: ctx.OpID, ActionID: action.ID, Desc: desc}.Debug()
return
}
if time.Now().After(action.ExpireAfter) {
ctx.Channels.Log <- mig.Log{OpID: ctx.OpID, ActionID: action.ID, Desc: fmt.Sprintf("action '%s' is expired. invalidating.", action.Name)}
err = invalidAction(ctx, action, actionPath)
if err != nil {
panic(err)
}
return
}
// find target agents for the action
agents, err := ctx.DB.ActiveAgentsByTarget(action.Target)
if err != nil {
panic(err)
}
action.Counters.Sent = len(agents)
if action.Counters.Sent == 0 {
err = fmt.Errorf("No agents found for target '%s'. invalidating action.", action.Target)
err = invalidAction(ctx, action, actionPath)
if err != nil {
panic(err)
}
}
ctx.Channels.Log <- mig.Log{OpID: ctx.OpID, ActionID: action.ID, Desc: fmt.Sprintf("Found %d target agents", action.Counters.Sent)}
action.Status = "preparing"
inserted, err := ctx.DB.InsertOrUpdateAction(action)
if err != nil {
panic(err)
}
if inserted {
// action was inserted, and not updated, so we need to insert
// the signatures as well
astr, err := action.String()
if err != nil {
panic(err)
}
for _, sig := range action.PGPSignatures {
pubring, err := getPubring(ctx)
if err != nil {
panic(err)
}
fp, err := pgp.GetFingerprintFromSignature(astr, sig, pubring)
if err != nil {
panic(err)
}
inv, err := ctx.DB.InvestigatorByFingerprint(fp)
if err != nil {
panic(err)
}
err = ctx.DB.InsertSignature(action.ID, inv.ID, sig)
if err != nil {
panic(err)
}
}
}
ctx.Channels.Log <- mig.Log{OpID: ctx.OpID, ActionID: action.ID, Desc: "Action written to database"}.Debug()
// create an array of empty results to serve as default for all commands
emptyResults := make([]modules.Result, len(action.Operations))
created := 0
for _, agent := range agents {
err := createCommand(ctx, action, agent, emptyResults)
if err != nil {
ctx.Channels.Log <- mig.Log{OpID: ctx.OpID, ActionID: action.ID, Desc: "Failed to create commmand on agent" + agent.Name}.Err()
continue
}
created++
}
if created == 0 {
// no command created found
ctx.Channels.Log <- mig.Log{OpID: ctx.OpID, ActionID: action.ID, Desc: "No command created. Invalidating action."}.Err()
err = invalidAction(ctx, action, actionPath)
if err != nil {
panic(err)
}
return nil
}
// move action to flying state
err = flyAction(ctx, action, actionPath)
if err != nil {
panic(err)
}
return
}
// createAction receives a signed action in a POST request, validates it,
// and write it into the scheduler spool
func createAction(respWriter http.ResponseWriter, request *http.Request) {
var (
err error
action mig.Action
)
opid := getOpID(request)
loc := fmt.Sprintf("%s%s", ctx.Server.Host, request.URL.String())
resource := cljs.New(loc)
defer func() {
if e := recover(); e != nil {
ctx.Channels.Log <- mig.Log{OpID: opid, ActionID: action.ID, Desc: fmt.Sprintf("%v", e)}.Err()
resource.SetError(cljs.Error{Code: fmt.Sprintf("%.0f", opid), Message: fmt.Sprintf("%v", e)})
respond(500, resource, respWriter, request)
}
ctx.Channels.Log <- mig.Log{OpID: opid, ActionID: action.ID, Desc: "leaving createAction()"}.Debug()
}()
// parse the POST body into a mig action
err = request.ParseForm()
if err != nil {
panic(err)
}
postAction := request.FormValue("action")
err = json.Unmarshal([]byte(postAction), &action)
if err != nil {
panic(err)
}
ctx.Channels.Log <- mig.Log{OpID: opid, Desc: fmt.Sprintf("Received action for creation '%s'", action)}.Debug()
// Init action fields
action.ID = mig.GenID()
date0 := time.Date(0011, time.January, 11, 11, 11, 11, 11, time.UTC)
date1 := time.Date(9998, time.January, 11, 11, 11, 11, 11, time.UTC)
action.StartTime = date0
action.FinishTime = date1
action.LastUpdateTime = date0
action.Status = "pending"
// load keyring and validate action
keyring, err := getKeyring()
if err != nil {
panic(err)
}
err = action.Validate()
if err != nil {
panic(err)
}
err = action.VerifySignatures(keyring)
if err != nil {
panic(err)
}
ctx.Channels.Log <- mig.Log{OpID: opid, ActionID: action.ID, Desc: "Received new action with valid signature"}
// write action to database
err = ctx.DB.InsertAction(action)
if err != nil {
panic(err)
}
// write signatures to database
astr, err := action.String()
if err != nil {
panic(err)
}
for _, sig := range action.PGPSignatures {
k, err := getKeyring()
if err != nil {
panic(err)
}
fp, err := pgp.GetFingerprintFromSignature(astr, sig, k)
if err != nil {
panic(err)
}
inv, err := ctx.DB.InvestigatorByFingerprint(fp)
if err != nil {
panic(err)
}
err = ctx.DB.InsertSignature(action.ID, inv.ID, sig)
if err != nil {
panic(err)
}
}
ctx.Channels.Log <- mig.Log{OpID: opid, ActionID: action.ID, Desc: "Action written to database"}
err = resource.AddItem(cljs.Item{
Href: fmt.Sprintf("%s/action?actionid=%.0f", ctx.Server.BaseURL, action.ID),
Data: []cljs.Data{{Name: "action ID " + fmt.Sprintf("%.0f", action.ID), Value: action}},
})
if err != nil {
panic(err)
}
// return a 202 Accepted. the action will be processed asynchronously, and may fail later.
respond(202, resource, respWriter, request)
}
// destroyAgent issues an `agentdestroy` action targetted to a specific agent
// and updates the status of the agent in the database
func destroyAgent(agent mig.Agent, ctx Context) (err error) {
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("destroyAgent() -> %v", e)
}
ctx.Channels.Log <- mig.Log{OpID: ctx.OpID, Desc: "leaving destroyAgent()"}.Debug()
}()
// generate an `agentdestroy` action for this agent
killAction := mig.Action{
ID: mig.GenID(),
Name: fmt.Sprintf("Destroy agent %s", agent.Name),
Target: agent.QueueLoc,
ValidFrom: time.Now().Add(-60 * time.Second).UTC(),
ExpireAfter: time.Now().Add(30 * time.Minute).UTC(),
SyntaxVersion: 1,
}
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
str, err := killAction.String()
if err != nil {
panic(err)
}
secringFile, err := os.Open(ctx.PGP.Home + "/secring.gpg")
defer secringFile.Close()
pgpsig, err := sign.Sign(str, ctx.PGP.KeyID, secringFile)
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("Requested destruction of agent '%s' with PID '%d'", agent.Name, agent.PID)}.Info()
return
}
// createAction receives a signed action in a POST request, validates it,
// and write it into the scheduler spool
func createAction(respWriter http.ResponseWriter, request *http.Request) {
var err error
opid := mig.GenID()
var action mig.Action
loc := fmt.Sprintf("http://%s:%d%s", ctx.Server.IP, ctx.Server.Port, request.URL.String())
resource := cljs.New(loc)
defer func() {
if e := recover(); e != nil {
ctx.Channels.Log <- mig.Log{OpID: opid, ActionID: action.ID, Desc: fmt.Sprintf("%v", e)}.Err()
resource.SetError(cljs.Error{Code: fmt.Sprintf("%.0f", opid), Message: fmt.Sprintf("%v", e)})
respond(500, resource, respWriter, request, opid)
}
ctx.Channels.Log <- mig.Log{OpID: opid, ActionID: action.ID, Desc: "leaving createAction()"}.Debug()
}()
// parse the POST body into a mig action
request.ParseForm()
postAction := request.FormValue("action")
err = json.Unmarshal([]byte(postAction), &action)
if err != nil {
panic(err)
}
ctx.Channels.Log <- mig.Log{OpID: opid, Desc: fmt.Sprintf("Received action for creation '%s'", action)}.Debug()
// Init action fields
action.ID = mig.GenID()
date0 := time.Date(9998, time.January, 11, 11, 11, 11, 11, time.UTC)
action.StartTime = date0
action.FinishTime = date0
action.LastUpdateTime = date0
action.Status = "init"
// load keyring and validate action
keyring, err := os.Open(ctx.PGP.Home + "/pubring.gpg")
if err != nil {
panic(err)
}
defer keyring.Close()
err = action.Validate()
if err != nil {
panic(err)
}
err = action.VerifySignatures(keyring)
if err != nil {
panic(err)
}
ctx.Channels.Log <- mig.Log{OpID: opid, ActionID: action.ID, Desc: "Received new action with valid signature"}
// write action to database
err = ctx.DB.InsertAction(action)
if err != nil {
panic(err)
}
// write signatures to database
astr, err := action.String()
if err != nil {
panic(err)
}
for _, sig := range action.PGPSignatures {
// TODO: opening the keyring in a loop is really ugly. rewind!
k, err := os.Open(ctx.PGP.Home + "/pubring.gpg")
if err != nil {
panic(err)
}
defer k.Close()
fp, err := pgp.GetFingerprintFromSignature(astr, sig, k)
if err != nil {
panic(err)
}
iid, err := ctx.DB.InvestigatorByFingerprint(fp)
if err != nil {
panic(err)
}
err = ctx.DB.InsertSignature(action.ID, iid, sig)
if err != nil {
panic(err)
}
}
ctx.Channels.Log <- mig.Log{OpID: opid, ActionID: action.ID, Desc: "Action written to database"}
// write action to disk
destdir := fmt.Sprintf("%s/%.0f.json", ctx.Directories.Action.New, action.ID)
newAction, err := json.Marshal(action)
if err != nil {
panic(err)
}
err = ioutil.WriteFile(destdir, newAction, 0640)
if err != nil {
panic(err)
}
ctx.Channels.Log <- mig.Log{OpID: opid, ActionID: action.ID, Desc: "Action committed to spool"}
err = resource.AddItem(cljs.Item{
Href: fmt.Sprintf("%s/action?actionid=%.0f", ctx.Server.BaseURL, action.ID),
Data: []cljs.Data{{Name: "action ID " + fmt.Sprintf("%.0f", action.ID), Value: action}},
})
if err != nil {
panic(err)
}
respond(201, resource, respWriter, request, opid)
}
