// checkActionAuthorization verifies the PGP signatures of a given action
// against the Access Control List of the agent.
func checkActionAuthorization(a mig.Action, ctx *Context) (err error) {
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("checkActionAuthorization() -> %v", e)
}
ctx.Channels.Log <- mig.Log{ActionID: a.ID, Desc: "leaving checkActionAuthorization()"}.Debug()
}()
var keys [][]byte
for _, pk := range PUBLICPGPKEYS {
keys = append(keys, []byte(pk))
}
// get an io.Reader from the public pgp key
keyring, keycount, err := pgp.ArmoredKeysToKeyring(keys)
if err != nil {
panic(err)
}
ctx.Channels.Log <- mig.Log{ActionID: a.ID, Desc: fmt.Sprintf("loaded %d keys", keycount)}.Debug()
// Check the action syntax and signature
err = a.Validate()
if err != nil {
desc := fmt.Sprintf("action validation failed: %v", err)
ctx.Channels.Log <- mig.Log{ActionID: a.ID, Desc: desc}.Err()
panic(desc)
}
// Validate() checks that the action hasn't expired, but we need to
// check the start time ourselves
if time.Now().Before(a.ValidFrom) {
ctx.Channels.Log <- mig.Log{ActionID: a.ID, Desc: "action is scheduled for later"}.Err()
panic("Action ValidFrom date is in the future")
}
// check ACLs, includes verifying signatures
err = a.VerifyACL(ctx.ACL, keyring)
if err != nil {
desc := fmt.Sprintf("action ACL verification failed: %v", err)
ctx.Channels.Log <- mig.Log{ActionID: a.ID, Desc: desc}.Err()
panic(desc)
}
ctx.Channels.Log <- mig.Log{ActionID: a.ID, Desc: "ACL verification succeeded."}.Debug()
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(http.StatusInternalServerError, 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(http.StatusAccepted, resource, respWriter, request)
}
func main() {
var err error
var Usage = func() {
fmt.Fprintf(os.Stderr,
"Mozilla InvestiGator Action Verifier\n"+
"usage: %s <-a action file> <-c command file>\n\n"+
"Command line to verify an action *or* command.\n"+
"Options:\n",
os.Args[0])
flag.PrintDefaults()
}
hasaction := false
hascommand := false
homedir := client.FindHomedir()
// command line options
var actionfile = flag.String("a", "/path/to/action", "Load action from file")
var commandfile = flag.String("c", "/path/to/command", "Load command from file")
var config = flag.String("conf", homedir+"/.migrc", "Load configuration from file")
var showversion = flag.Bool("V", false, "Show build version and exit")
flag.Parse()
if *showversion {
fmt.Println(mig.Version)
os.Exit(0)
}
conf, err := client.ReadConfiguration(*config)
if err != nil {
panic(err)
}
// if a file is defined, load action from that
if *actionfile != "/path/to/action" {
hasaction = true
}
if *commandfile != "/path/to/command" {
hascommand = true
}
if (hasaction && hascommand) || (!hasaction && !hascommand) {
fmt.Println("[error] either an action file or a command file must be provided")
Usage()
os.Exit(1)
}
var a mig.Action
if hasaction {
a, err = mig.ActionFromFile(*actionfile)
if err != nil {
panic(err)
}
} else {
c, err := mig.CmdFromFile(*commandfile)
if err != nil {
panic(err)
}
a = c.Action
}
err = a.Validate()
if err != nil {
fmt.Println(err)
}
pubringFile, err := os.Open(conf.GPG.Home + "/pubring.gpg")
if err != nil {
panic(err)
}
defer pubringFile.Close()
// syntax checking
err = a.VerifySignatures(pubringFile)
if err != nil {
fmt.Println("[error]", err)
} else {
fmt.Println("Valid signature")
}
}
