mirror of
https://github.com/kairos-io/kcrypt-challenger.git
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a3df62df03
in order to identify the partition. The label is not available before the filesystem is descrypted (post-install). In that case the server can look up the partition in the configuration using the name or the mountpoint. Signed-off-by: Dimitris Karakasilis <dimitris@karakasilis.me>
122 lines
2.6 KiB
Go
122 lines
2.6 KiB
Go
package main
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import (
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"encoding/json"
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"fmt"
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"os"
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"time"
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"github.com/jaypipes/ghw/pkg/block"
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"github.com/kairos-io/go-tpm"
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"github.com/kairos-io/kairos/pkg/machine"
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"github.com/kairos-io/kcrypt/pkg/bus"
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"gopkg.in/yaml.v3"
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"github.com/mudler/go-pluggable"
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)
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func main() {
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if len(os.Args) >= 2 && bus.IsEventDefined(os.Args[1]) {
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checkErr(start())
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}
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pubhash, _ := tpm.GetPubHash()
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fmt.Print(pubhash)
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}
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func checkErr(err error) {
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if err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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os.Exit(0)
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}
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func readServer() string {
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connectionDetails := config{}
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var server string
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// best-effort
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d, _ := machine.DotToYAML("/proc/cmdline")
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yaml.Unmarshal(d, &connectionDetails) //nolint:errcheck
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server = connectionDetails.Server
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if os.Getenv("WSS_SERVER") != "" {
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server = os.Getenv("WSS_SERVER")
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}
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return server
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}
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func waitPass(p *block.Partition, attempts int) (pass string, err error) {
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for tries := 0; tries < attempts; tries++ {
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server := readServer()
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if server == "" {
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err = fmt.Errorf("no server configured")
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continue
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}
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pass, err = getPass(server, p)
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if pass != "" || err == nil {
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return pass, err
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}
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time.Sleep(1 * time.Second)
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}
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return
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}
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func getPass(server string, partition *block.Partition) (string, error) {
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msg, err := tpm.Get(server,
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tpm.WithAdditionalHeader("label", partition.Label),
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tpm.WithAdditionalHeader("name", partition.Name),
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tpm.WithAdditionalHeader("uuid", partition.UUID))
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if err != nil {
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return "", err
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}
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result := map[string]interface{}{}
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err = json.Unmarshal(msg, &result)
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if err != nil {
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return "", err
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}
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p, ok := result["passphrase"]
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if ok {
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return fmt.Sprint(p), nil
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}
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return "", fmt.Errorf("pass for partition not found")
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}
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type config struct {
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Server string `yaml:"challenger_server"`
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}
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// ❯ echo '{ "data": "{ \\"label\\": \\"LABEL\\" }"}' | sudo -E WSS_SERVER="http://localhost:8082/challenge" ./challenger "discovery.password"
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func start() error {
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factory := pluggable.NewPluginFactory()
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// Input: bus.EventInstallPayload
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// Expected output: map[string]string{}
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factory.Add(bus.EventDiscoveryPassword, func(e *pluggable.Event) pluggable.EventResponse {
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b := &block.Partition{}
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err := json.Unmarshal([]byte(e.Data), b)
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if err != nil {
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return pluggable.EventResponse{
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Error: fmt.Sprintf("failed reading partitions: %s", err.Error()),
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}
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}
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pass, err := waitPass(b, 30)
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if err != nil {
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return pluggable.EventResponse{
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Error: fmt.Sprintf("failed getting pass: %s", err.Error()),
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}
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}
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return pluggable.EventResponse{
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Data: pass,
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}
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})
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return factory.Run(pluggable.EventType(os.Args[1]), os.Stdin, os.Stdout)
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}
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