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Store full nebula cert for each host in garage, rather than just the IP

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This allows each host to verify the cert against the CA cert. We also
now have each host sign the yaml file that it posts to garage, to ensure
that a host can't arbitrarily overwrite another host's file.
This commit is contained in:
Brian Picciano 2022-10-29 21:11:40 +02:00
parent 711d568036
commit 7dceb659ef
14 changed files with 390 additions and 230 deletions
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10
entrypoint/src/admin/admin.go
View File

@ -35,7 +35,7 @@ type CreationParams struct {
type Admin struct {
CreationParams CreationParams
NebulaCACert nebula.CACert
NebulaCACredentials nebula.CACredentials
GarageRPCSecret string
GarageGlobalBucketS3APICredentials garage.S3APICredentials
@ -67,8 +67,8 @@ func FromFS(adminFS fs.FS) (Admin, error) {
into *string
path string
}{
{&a.NebulaCACert.CACert, nebulaCertsCACertPath},
{&a.NebulaCACert.CAKey, nebulaCertsCAKeyPath},
{&a.NebulaCACredentials.CACertPEM, nebulaCertsCACertPath},
{&a.NebulaCACredentials.CAKeyPEM, nebulaCertsCAKeyPath},
{&a.GarageRPCSecret, garageRPCSecretPath},
}
@ -122,8 +122,8 @@ func (a Admin) WriteTo(into io.Writer) error {
value string
path string
}{
{a.NebulaCACert.CACert, nebulaCertsCACertPath},
{a.NebulaCACert.CAKey, nebulaCertsCAKeyPath},
{a.NebulaCACredentials.CACertPEM, nebulaCertsCACertPath},
{a.NebulaCACredentials.CAKeyPEM, nebulaCertsCAKeyPath},
{a.GarageRPCSecret, garageRPCSecretPath},
}

30
entrypoint/src/bootstrap/bootstrap.go
View File

@ -45,7 +45,7 @@ type Bootstrap struct {
Hosts map[string]Host
HostName string
NebulaHostCert nebula.HostCert
NebulaHostCredentials nebula.HostCredentials
GarageRPCSecret string
GarageAdminToken string
@ -84,9 +84,9 @@ func FromFS(bootstrapFS fs.FS) (Bootstrap, error) {
path string
}{
{&b.HostName, hostNamePath},
{&b.NebulaHostCert.CACert, nebulaCertsCACertPath},
{&b.NebulaHostCert.HostCert, nebulaCertsHostCertPath},
{&b.NebulaHostCert.HostKey, nebulaCertsHostKeyPath},
{&b.NebulaHostCredentials.CACertPEM, nebulaCertsCACertPath},
{&b.NebulaHostCredentials.HostCertPEM, nebulaCertsHostCertPath},
{&b.NebulaHostCredentials.HostKeyPEM, nebulaCertsHostKeyPath},
{&b.GarageRPCSecret, garageRPCSecretPath},
{&b.GarageAdminToken, garageAdminTokenPath},
}
@ -165,9 +165,9 @@ func (b Bootstrap) WriteTo(into io.Writer) error {
path string
}{
{b.HostName, hostNamePath},
{b.NebulaHostCert.CACert, nebulaCertsCACertPath},
{b.NebulaHostCert.HostCert, nebulaCertsHostCertPath},
{b.NebulaHostCert.HostKey, nebulaCertsHostKeyPath},
{b.NebulaHostCredentials.CACertPEM, nebulaCertsCACertPath},
{b.NebulaHostCredentials.HostCertPEM, nebulaCertsHostCertPath},
{b.NebulaHostCredentials.HostKeyPEM, nebulaCertsHostKeyPath},
{b.GarageRPCSecret, garageRPCSecretPath},
{b.GarageAdminToken, garageAdminTokenPath},
}
@ -209,19 +209,3 @@ func HostsHash(hostsMap map[string]Host) ([]byte, error) {
return h.Sum(nil), nil
}
// WithHosts returns a copy of the Bootstrap with the given set of Hosts applied
// to it. It will _not_ overwrite the Host for _this_ host, however.
func (b Bootstrap) WithHosts(hosts map[string]Host) Bootstrap {
hostsCopy := make(map[string]Host, len(hosts))
for name, host := range hosts {
hostsCopy[name] = host
}
hostsCopy[b.HostName] = b.ThisHost()
b.Hosts = hostsCopy
return b
}

5
entrypoint/src/bootstrap/garage.go
View File

@ -26,7 +26,7 @@ func (b Bootstrap) GaragePeers() []garage.RemotePeer {
peer := garage.RemotePeer{
ID: instance.ID,
IP: host.Nebula.IP,
IP: host.IP().String(),
RPCPort: instance.RPCPort,
S3APIPort: instance.S3APIPort,
}
@ -56,10 +56,11 @@ func (b Bootstrap) ChooseGaragePeer() garage.RemotePeer {
thisHost := b.ThisHost()
if thisHost.Garage != nil && len(thisHost.Garage.Instances) > 0 {
inst := thisHost.Garage.Instances[0]
return garage.RemotePeer{
ID: inst.ID,
IP: thisHost.Nebula.IP,
IP: thisHost.IP().String(),
RPCPort: inst.RPCPort,
S3APIPort: inst.S3APIPort,
}

77
entrypoint/src/bootstrap/garage_global_bucket.go
View File

@ -4,8 +4,9 @@ import (
"bytes"
"context"
"cryptic-net/garage"
"cryptic-net/nebula"
"fmt"
"log"
"os"
"path/filepath"
"github.com/minio/minio-go/v7"
@ -17,23 +18,32 @@ const (
garageGlobalBucketBootstrapHostsDirPath = "bootstrap/hosts"
)
// PutGarageBoostrapHost places the <hostname>.yml file for the given host into
// garage so that other hosts are able to see relevant configuration for it.
//
// The given client should be for the global bucket.
func PutGarageBoostrapHost(
ctx context.Context, client garage.S3APIClient, host Host,
) error {
// PutGarageBoostrapHost places the <hostname>.yml.signed file for this host
// into garage so that other hosts are able to see relevant configuration for
// it.
func (b Bootstrap) PutGarageBoostrapHost(ctx context.Context) error {
host := b.ThisHost()
client := b.GlobalBucketS3APIClient()
hostB, err := yaml.Marshal(host)
if err != nil {
return fmt.Errorf("yaml encoding host data: %w", err)
}
buf := new(bytes.Buffer)
if err := yaml.NewEncoder(buf).Encode(host); err != nil {
log.Fatalf("yaml encoding host data: %v", err)
err = nebula.SignAndWrap(buf, b.NebulaHostCredentials.HostKeyPEM, hostB)
if err != nil {
return fmt.Errorf("signing encoded host data: %w", err)
}
filePath := filepath.Join(garageGlobalBucketBootstrapHostsDirPath, host.Name+".yml")
filePath := filepath.Join(
garageGlobalBucketBootstrapHostsDirPath,
host.Name+".yml.signed",
)
_, err := client.PutObject(
_, err = client.PutObject(
ctx, garage.GlobalBucket, filePath, buf, int64(buf.Len()),
minio.PutObjectOptions{},
)
@ -45,15 +55,18 @@ func PutGarageBoostrapHost(
return nil
}
// RemoveGarageBootstrapHost removes the <hostname>.yml for the given host from
// garage.
// RemoveGarageBootstrapHost removes the <hostname>.yml.signed for the given
// host from garage.
//
// The given client should be for the global bucket.
func RemoveGarageBootstrapHost(
ctx context.Context, client garage.S3APIClient, hostName string,
) error {
filePath := filepath.Join(garageGlobalBucketBootstrapHostsDirPath, hostName+".yml")
filePath := filepath.Join(
garageGlobalBucketBootstrapHostsDirPath,
hostName+".yml.signed",
)
return client.RemoveObject(
ctx, garage.GlobalBucket, filePath,
@ -61,16 +74,17 @@ func RemoveGarageBootstrapHost(
)
}
// GetGarageBootstrapHosts loads the <hostname>.yml file for all hosts stored in
// garage.
//
// The given client should be for the global bucket.
func GetGarageBootstrapHosts(
ctx context.Context, client garage.S3APIClient,
// GetGarageBootstrapHosts loads the <hostname>.yml.signed file for all hosts
// stored in garage.
func (b Bootstrap) GetGarageBootstrapHosts(
ctx context.Context,
) (
map[string]Host, error,
) {
caCertPEM := b.NebulaHostCredentials.CACertPEM
client := b.GlobalBucketS3APIClient()
hosts := map[string]Host{}
objInfoCh := client.ListObjects(
@ -95,15 +109,30 @@ func GetGarageBootstrapHosts(
return nil, fmt.Errorf("retrieving object %q: %w", objInfo.Key, err)
}
var host Host
err = yaml.NewDecoder(obj).Decode(&host)
hostB, sig, err := nebula.Unwrap(obj)
obj.Close()
if err != nil {
return nil, fmt.Errorf("unwrapping signature from %q: %w", objInfo.Key, err)
}
var host Host
if err = yaml.Unmarshal(hostB, &host); err != nil {
return nil, fmt.Errorf("yaml decoding object %q: %w", objInfo.Key, err)
}
hostCertPEM := host.Nebula.CertPEM
if err := nebula.ValidateSignature(hostCertPEM, hostB, sig); err != nil {
fmt.Fprintf(os.Stderr, "invalid host data for %q: %w\n", objInfo.Key, err)
continue
}
if err := nebula.ValidateHostCertPEM(caCertPEM, hostCertPEM); err != nil {
fmt.Fprintf(os.Stderr, "invalid nebula cert for %q: %w\n", objInfo.Key, err)
continue
}
hosts[host.Name] = host
}

16
entrypoint/src/bootstrap/hosts.go
View File

@ -1,8 +1,10 @@
package bootstrap
import (
"cryptic-net/nebula"
"fmt"
"io/fs"
"net"
"path/filepath"
"strings"
@ -16,7 +18,7 @@ const (
// NebulaHost describes the nebula configuration of a Host which is relevant for
// other hosts to know.
type NebulaHost struct {
IP string `yaml:"ip"`
CertPEM string `yaml:"crt"`
PublicAddr string `yaml:"public_addr,omitempty"`
}
@ -41,6 +43,18 @@ type Host struct {
Garage *GarageHost `yaml:"garage,omitempty"`
}
// IP returns the IP address encoded in the Host's nebula certificate, or panics
// if there is an error.
func (h Host) IP() net.IP {
ip, err := nebula.IPFromHostCertPEM(h.Nebula.CertPEM)
if err != nil {
panic(fmt.Errorf("could not parse IP out of cert for host %q: %w", h.Name, err))
}
return ip
}
func loadHosts(bootstrapFS fs.FS) (map[string]Host, error) {
hosts := map[string]Host{}

56
entrypoint/src/cmd/entrypoint/admin.go
View File

@ -117,12 +117,12 @@ var subCmdAdminCreateNetwork = subCmd{
return fmt.Errorf("daemon config with at least 3 allocations was not provided")
}
nebulaCACert, err := nebula.NewCACert(*domain, subnet)
nebulaCACreds, err := nebula.NewCACredentials(*domain, subnet)
if err != nil {
return fmt.Errorf("creating nebula CA cert: %w", err)
}
nebulaHostCert, err := nebula.NewHostCert(nebulaCACert, *hostName, ip)
nebulaHostCreds, err := nebula.NewHostCredentials(nebulaCACreds, *hostName, ip)
if err != nil {
return fmt.Errorf("creating nebula cert for host: %w", err)
}
@ -138,12 +138,12 @@ var subCmdAdminCreateNetwork = subCmd{
*hostName: bootstrap.Host{
Name: *hostName,
Nebula: bootstrap.NebulaHost{
IP: ip.String(),
CertPEM: nebulaHostCreds.HostCertPEM,
},
},
},
HostName: *hostName,
NebulaHostCert: nebulaHostCert,
NebulaHostCredentials: nebulaHostCreds,
GarageRPCSecret: randStr(32),
GarageAdminToken: randStr(32),
GarageGlobalBucketS3APICredentials: garage.NewS3APICredentials(),
@ -213,7 +213,7 @@ var subCmdAdminCreateNetwork = subCmd{
err = admin.Admin{
CreationParams: adminCreationParams,
NebulaCACert: nebulaCACert,
NebulaCACredentials: nebulaCACreds,
GarageRPCSecret: hostBootstrap.GarageRPCSecret,
GarageGlobalBucketS3APICredentials: hostBootstrap.GarageGlobalBucketS3APICredentials,
GarageAdminBucketS3APICredentials: garage.NewS3APICredentials(),
@ -240,6 +240,11 @@ var subCmdAdminMakeBootstrap = subCmd{
"Name of the host to generate bootstrap.tgz for",
)
ipStr := flags.StringP(
"ip", "i", "",
"IP of the new host",
)
adminPath := flags.StringP(
"admin-path", "a", "",
`Path to admin.tgz file. If the given path is "-" then stdin is used.`,
@ -249,13 +254,18 @@ var subCmdAdminMakeBootstrap = subCmd{
return fmt.Errorf("parsing flags: %w", err)
}
if *name == "" || *adminPath == "" {
return errors.New("--name and --admin-path are required")
if *name == "" || *ipStr == "" || *adminPath == "" {
return errors.New("--name, --ip, and --admin-path are required")
}
hostBootstrap, err := loadHostBootstrap()
if err != nil {
return fmt.Errorf("loading host bootstrap: %w", err)
if err := validateHostName(*name); err != nil {
return fmt.Errorf("invalid hostname %q: %w", *name, err)
}
ip := net.ParseIP(*ipStr)
if ip == nil {
return fmt.Errorf("invalid ip %q", *ipStr)
}
adm, err := readAdmin(*adminPath)
@ -263,28 +273,12 @@ var subCmdAdminMakeBootstrap = subCmd{
return fmt.Errorf("reading admin.tgz with --admin-path of %q: %w", *adminPath, err)
}
client := hostBootstrap.GlobalBucketS3APIClient()
// NOTE this isn't _technically_ required, but if the `hosts add`
// command for this host has been run recently then it might not have
// made it into the bootstrap file yet, and so won't be in
// `hostBootstrap`.
hosts, err := bootstrap.GetGarageBootstrapHosts(subCmdCtx.ctx, client)
hostBootstrap, err := loadHostBootstrap()
if err != nil {
return fmt.Errorf("retrieving host info from garage: %w", err)
return fmt.Errorf("loading host bootstrap: %w", err)
}
host, ok := hosts[*name]
if !ok {
return fmt.Errorf("couldn't find host into for %q in garage, has `cryptic-net hosts add` been run yet?", *name)
}
ip := net.ParseIP(host.Nebula.IP)
if ip == nil {
return fmt.Errorf("invalid IP stored with host %q: %q", *name, host.Nebula.IP)
}
nebulaHostCert, err := nebula.NewHostCert(adm.NebulaCACert, host.Name, ip)
nebulaHostCreds, err := nebula.NewHostCredentials(adm.NebulaCACredentials, *name, ip)
if err != nil {
return fmt.Errorf("creating new nebula host key/cert: %w", err)
}
@ -292,10 +286,10 @@ var subCmdAdminMakeBootstrap = subCmd{
newHostBootstrap := bootstrap.Bootstrap{
AdminCreationParams: adm.CreationParams,
Hosts: hosts,
Hosts: hostBootstrap.Hosts,
HostName: *name,
NebulaHostCert: nebulaHostCert,
NebulaHostCredentials: nebulaHostCreds,
GarageRPCSecret: adm.GarageRPCSecret,
GarageAdminToken: randStr(32),

33
entrypoint/src/cmd/entrypoint/daemon.go
View File

@ -12,7 +12,6 @@ import (
"cryptic-net/bootstrap"
"cryptic-net/daemon"
"cryptic-net/garage"
"code.betamike.com/cryptic-io/pmux/pmuxlib"
)
@ -42,16 +41,21 @@ import (
func reloadBootstrap(
ctx context.Context,
hostBootstrap bootstrap.Bootstrap,
s3Client garage.S3APIClient,
) (
bootstrap.Bootstrap, bool, error,
) {
newHosts, err := bootstrap.GetGarageBootstrapHosts(ctx, s3Client)
thisHost := hostBootstrap.ThisHost()
newHosts, err := hostBootstrap.GetGarageBootstrapHosts(ctx)
if err != nil {
return bootstrap.Bootstrap{}, false, fmt.Errorf("getting hosts from garage: %w", err)
}
// the daemon's view of this host's bootstrap info takes precedence over
// whatever is in garage
newHosts[thisHost.Name] = thisHost
newHostsHash, err := bootstrap.HostsHash(newHosts)
if err != nil {
return bootstrap.Bootstrap{}, false, fmt.Errorf("calculating hash of new hosts: %w", err)
@ -66,13 +70,8 @@ func reloadBootstrap(
return hostBootstrap, false, nil
}
newHostBootstrap := hostBootstrap.WithHosts(newHosts)
if err := writeBootstrapToDataDir(newHostBootstrap); err != nil {
return bootstrap.Bootstrap{}, false, fmt.Errorf("writing new bootstrap.tgz to data dir: %w", err)
}
return newHostBootstrap, true, nil
hostBootstrap.Hosts = newHosts
return hostBootstrap, true, nil
}
// runs a single pmux process of daemon, returning only once the env.Context has
@ -87,14 +86,6 @@ func runDaemonPmuxOnce(
bootstrap.Bootstrap, error,
) {
thisHost := hostBootstrap.ThisHost()
fmt.Fprintf(os.Stderr, "host name is %q, ip is %q\n", thisHost.Name, thisHost.Nebula.IP)
// create s3Client anew on every loop, in case the topology has
// changed and we should be connecting to a different garage
// endpoint.
s3Client := hostBootstrap.GlobalBucketS3APIClient()
nebulaPmuxProcConfig, err := nebulaPmuxProcConfig(hostBootstrap, daemonConfig)
if err != nil {
return bootstrap.Bootstrap{}, fmt.Errorf("generating nebula config: %w", err)
@ -143,11 +134,9 @@ func runDaemonPmuxOnce(
return
}
thisHost := hostBootstrap.ThisHost()
err := doOnce(ctx, func(ctx context.Context) error {
fmt.Fprintln(os.Stderr, "updating host info in garage")
return bootstrap.PutGarageBoostrapHost(ctx, s3Client, thisHost)
return hostBootstrap.PutGarageBoostrapHost(ctx)
})
if err != nil {
@ -194,7 +183,7 @@ func runDaemonPmuxOnce(
err error
)
if hostBootstrap, changed, err = reloadBootstrap(ctx, hostBootstrap, s3Client); err != nil {
if hostBootstrap, changed, err = reloadBootstrap(ctx, hostBootstrap); err != nil {
return bootstrap.Bootstrap{}, fmt.Errorf("reloading bootstrap: %w", err)
} else if changed {

11
entrypoint/src/cmd/entrypoint/dnsmasq_util.go
View File

@ -20,19 +20,22 @@ func dnsmasqPmuxProcConfig(
confPath := filepath.Join(envRuntimeDirPath, "dnsmasq.conf")
hostsSlice := make([]bootstrap.Host, 0, len(hostBootstrap.Hosts))
hostsSlice := make([]dnsmasq.ConfDataHost, 0, len(hostBootstrap.Hosts))
for _, host := range hostBootstrap.Hosts {
hostsSlice = append(hostsSlice, host)
hostsSlice = append(hostsSlice, dnsmasq.ConfDataHost{
Name: host.Name,
IP: host.IP().String(),
})
}
sort.Slice(hostsSlice, func(i, j int) bool {
return hostsSlice[i].Nebula.IP < hostsSlice[j].Nebula.IP
return hostsSlice[i].IP < hostsSlice[j].IP
})
confData := dnsmasq.ConfData{
Resolvers: daemonConfig.DNS.Resolvers,
Domain: hostBootstrap.AdminCreationParams.Domain,
IP: hostBootstrap.ThisHost().Nebula.IP,
IP: hostBootstrap.ThisHost().IP().String(),
Hosts: hostsSlice,
}

6
entrypoint/src/cmd/entrypoint/garage_util.go
View File

@ -23,7 +23,7 @@ func newGarageAdminClient(
return garage.NewAdminClient(
net.JoinHostPort(
thisHost.Nebula.IP,
thisHost.IP().String(),
strconv.Itoa(daemonConfig.Storage.Allocations[0].AdminPort),
),
hostBootstrap.GarageAdminToken,
@ -47,7 +47,7 @@ func waitForGarageAndNebula(
for _, alloc := range allocs {
adminAddr := net.JoinHostPort(
hostBootstrap.ThisHost().Nebula.IP,
hostBootstrap.ThisHost().IP().String(),
strconv.Itoa(alloc.AdminPort),
)
@ -97,7 +97,7 @@ func garageWriteChildConfig(
peer := garage.LocalPeer{
RemotePeer: garage.RemotePeer{
ID: id,
IP: thisHost.Nebula.IP,
IP: thisHost.IP().String(),
RPCPort: alloc.RPCPort,
S3APIPort: alloc.S3APIPort,
},

60
entrypoint/src/cmd/entrypoint/hosts.go
View File

@ -4,7 +4,6 @@ import (
"cryptic-net/bootstrap"
"errors"
"fmt"
"net"
"os"
"regexp"
"sort"
@ -23,60 +22,6 @@ func validateHostName(name string) error {
return nil
}
var subCmdHostsAdd = subCmd{
name: "add",
descr: "Adds a host to the network",
checkLock: true,
do: func(subCmdCtx subCmdCtx) error {
flags := subCmdCtx.flagSet(false)
name := flags.StringP(
"name", "n", "",
"Name of the new host",
)
ip := flags.StringP(
"ip", "i", "",
"IP of the new host",
)
if err := flags.Parse(subCmdCtx.args); err != nil {
return fmt.Errorf("parsing flags: %w", err)
}
if *name == "" || *ip == "" {
return errors.New("--name and --ip are required")
}
if err := validateHostName(*name); err != nil {
return fmt.Errorf("invalid hostname %q: %w", *name, err)
}
if net.ParseIP(*ip) == nil {
return fmt.Errorf("invalid ip %q", *ip)
}
// TODO validate that the IP is in the correct CIDR
hostBootstrap, err := loadHostBootstrap()
if err != nil {
return fmt.Errorf("loading host bootstrap: %w", err)
}
client := hostBootstrap.GlobalBucketS3APIClient()
host := bootstrap.Host{
Name: *name,
Nebula: bootstrap.NebulaHost{
IP: *ip,
},
}
return bootstrap.PutGarageBoostrapHost(subCmdCtx.ctx, client, host)
},
}
var subCmdHostsList = subCmd{
name: "list",
descr: "Lists all hosts in the network, and their IPs",
@ -88,9 +33,7 @@ var subCmdHostsList = subCmd{
return fmt.Errorf("loading host bootstrap: %w", err)
}
client := hostBootstrap.GlobalBucketS3APIClient()
hostsMap, err := bootstrap.GetGarageBootstrapHosts(subCmdCtx.ctx, client)
hostsMap, err := hostBootstrap.GetGarageBootstrapHosts(subCmdCtx.ctx)
if err != nil {
return fmt.Errorf("retrieving hosts from garage: %w", err)
}
@ -143,7 +86,6 @@ var subCmdHosts = subCmd{
descr: "Sub-commands having to do with configuration of hosts in the network",
do: func(subCmdCtx subCmdCtx) error {
return subCmdCtx.doSubCmd(
subCmdHostsAdd,
subCmdHostsDelete,
subCmdHostsList,
)

14
entrypoint/src/cmd/entrypoint/nebula_util.go
View File

@ -18,8 +18,7 @@ import (
// interface has been initialized.
func waitForNebula(ctx context.Context, hostBootstrap bootstrap.Bootstrap) error {
ipStr := hostBootstrap.ThisHost().Nebula.IP
ip := net.ParseIP(ipStr)
ip := hostBootstrap.ThisHost().IP()
lUdpAddr := &net.UDPAddr{IP: ip, Port: 0}
rUdpAddr := &net.UDPAddr{IP: ip, Port: 45535}
@ -52,15 +51,16 @@ func nebulaPmuxProcConfig(
continue
}
lighthouseHostIPs = append(lighthouseHostIPs, host.Nebula.IP)
staticHostMap[host.Nebula.IP] = []string{host.Nebula.PublicAddr}
ip := host.IP().String()
lighthouseHostIPs = append(lighthouseHostIPs, ip)
staticHostMap[ip] = []string{host.Nebula.PublicAddr}
}
config := map[string]interface{}{
"pki": map[string]string{
"ca": hostBootstrap.NebulaHostCert.CACert,
"cert": hostBootstrap.NebulaHostCert.HostCert,
"key": hostBootstrap.NebulaHostCert.HostKey,
"ca": hostBootstrap.NebulaHostCredentials.CACertPEM,
"cert": hostBootstrap.NebulaHostCredentials.HostCertPEM,
"key": hostBootstrap.NebulaHostCredentials.HostKeyPEM,
},
"static_host_map": staticHostMap,
"punchy": map[string]bool{

9
entrypoint/src/dnsmasq/tpl.go
View File

@ -1,18 +1,23 @@
package dnsmasq
import (
"cryptic-net/bootstrap"
"fmt"
"os"
"text/template"
)
// ConfDataHost describes a host which can be resolved by dnsmasq.
type ConfDataHost struct {
Name string
IP string
}
// ConfData describes all the data needed to populate a dnsmasq.conf file.
type ConfData struct {
Resolvers []string
Domain string
IP string
Hosts []bootstrap.Host
Hosts []ConfDataHost
}
var confTpl = template.Must(template.New("").Parse(`

216
entrypoint/src/nebula/nebula.go
View File

@ -3,8 +3,11 @@
package nebula
import (
"crypto"
"crypto/ed25519"
"crypto/rand"
"encoding/pem"
"errors"
"fmt"
"io"
"net"
@ -14,65 +17,69 @@ import (
"golang.org/x/crypto/curve25519"
)
// HostCert contains the certificate and private key files which will need to
// be present on a particular host. Each file is PEM encoded.
type HostCert struct {
CACert string
HostKey string
HostCert string
// ErrInvalidSignature is returned from functions when a signature validation
// fails.
var ErrInvalidSignature = errors.New("invalid signature")
// HostCredentials contains the certificate and private key files which will
// need to be present on a particular host. Each file is PEM encoded.
type HostCredentials struct {
CACertPEM string
HostKeyPEM string
HostCertPEM string
}
// CACert contains the certificate and private files which can be used to create
// HostCerts. Each file is PEM encoded.
type CACert struct {
CACert string
CAKey string
// CACredentials contains the certificate and private files which can be used to
// create and validate HostCredentials. Each file is PEM encoded.
type CACredentials struct {
CACertPEM string
CAKeyPEM string
}
// NewHostCert generates a new key/cert for a nebula host using the CA key
// which will be found in the adminFS.
func NewHostCert(
caCert CACert, hostName string, ip net.IP,
// NewHostCredentials generates a new key/cert for a nebula host using the CA
// key which will be found in the adminFS.
func NewHostCredentials(
caCreds CACredentials, hostName string, ip net.IP,
) (
HostCert, error,
HostCredentials, error,
) {
// The logic here is largely based on
// https://github.com/slackhq/nebula/blob/v1.4.0/cmd/nebula-cert/sign.go
caKey, _, err := cert.UnmarshalEd25519PrivateKey([]byte(caCert.CAKey))
caKey, _, err := cert.UnmarshalEd25519PrivateKey([]byte(caCreds.CAKeyPEM))
if err != nil {
return HostCert{}, fmt.Errorf("unmarshaling ca.key: %w", err)
return HostCredentials{}, fmt.Errorf("unmarshaling ca.key: %w", err)
}
caCrt, _, err := cert.UnmarshalNebulaCertificateFromPEM([]byte(caCert.CACert))
caCert, _, err := cert.UnmarshalNebulaCertificateFromPEM([]byte(caCreds.CACertPEM))
if err != nil {
return HostCert{}, fmt.Errorf("unmarshaling ca.crt: %w", err)
return HostCredentials{}, fmt.Errorf("unmarshaling ca.crt: %w", err)
}
issuer, err := caCrt.Sha256Sum()
issuer, err := caCert.Sha256Sum()
if err != nil {
return HostCert{}, fmt.Errorf("getting ca.crt issuer: %w", err)
return HostCredentials{}, fmt.Errorf("getting ca.crt issuer: %w", err)
}
expireAt := caCrt.Details.NotAfter.Add(-1 * time.Second)
expireAt := caCert.Details.NotAfter.Add(-1 * time.Second)
subnet := caCrt.Details.Subnets[0]
subnet := caCert.Details.Subnets[0]
if !subnet.Contains(ip) {
return HostCert{}, fmt.Errorf("invalid ip %q, not contained by network subnet %q", ip, subnet)
return HostCredentials{}, fmt.Errorf("invalid ip %q, not contained by network subnet %q", ip, subnet)
}
var hostPub, hostKey []byte
{
var pubkey, privkey [32]byte
if _, err := io.ReadFull(rand.Reader, privkey[:]); err != nil {
return HostCert{}, fmt.Errorf("reading random bytes to form private key: %w", err)
return HostCredentials{}, fmt.Errorf("reading random bytes to form private key: %w", err)
}
curve25519.ScalarBaseMult(&pubkey, &privkey)
hostPub, hostKey = pubkey[:], privkey[:]
}
hostCrt := cert.NebulaCertificate{
hostCert := cert.NebulaCertificate{
Details: cert.NebulaCertificateDetails{
Name: hostName,
Ips: []*net.IPNet{{
@ -87,31 +94,31 @@ func NewHostCert(
},
}
if err := hostCrt.CheckRootConstrains(caCrt); err != nil {
return HostCert{}, fmt.Errorf("validating certificate constraints: %w", err)
if err := hostCert.CheckRootConstrains(caCert); err != nil {
return HostCredentials{}, fmt.Errorf("validating certificate constraints: %w", err)
}
if err := hostCrt.Sign(caKey); err != nil {
return HostCert{}, fmt.Errorf("signing host cert with ca.key: %w", err)
if err := hostCert.Sign(caKey); err != nil {
return HostCredentials{}, fmt.Errorf("signing host cert with ca.key: %w", err)
}
hostKeyPEM := cert.MarshalX25519PrivateKey(hostKey)
hostCrtPEM, err := hostCrt.MarshalToPEM()
hostCertPEM, err := hostCert.MarshalToPEM()
if err != nil {
return HostCert{}, fmt.Errorf("marshalling host.crt: %w", err)
return HostCredentials{}, fmt.Errorf("marshalling host.crt: %w", err)
}
return HostCert{
CACert: caCert.CACert,
HostKey: string(hostKeyPEM),
HostCert: string(hostCrtPEM),
return HostCredentials{
CACertPEM: caCreds.CACertPEM,
HostKeyPEM: string(hostKeyPEM),
HostCertPEM: string(hostCertPEM),
}, nil
}
// NewCACert generates a CACert. The domain should be the network's root domain,
// NewCACredentials generates a CACredentials. The domain should be the network's root domain,
// and is included in the signing certificate's Name field.
func NewCACert(domain string, subnet *net.IPNet) (CACert, error) {
func NewCACredentials(domain string, subnet *net.IPNet) (CACredentials, error) {
pubKey, privKey, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
@ -121,7 +128,7 @@ func NewCACert(domain string, subnet *net.IPNet) (CACert, error) {
now := time.Now()
expireAt := now.Add(2 * 365 * 24 * time.Hour)
caCrt := cert.NebulaCertificate{
caCert := cert.NebulaCertificate{
Details: cert.NebulaCertificateDetails{
Name: fmt.Sprintf("%s cryptic-net root cert", domain),
Subnets: []*net.IPNet{subnet},
@ -132,19 +139,134 @@ func NewCACert(domain string, subnet *net.IPNet) (CACert, error) {
},
}
if err := caCrt.Sign(privKey); err != nil {
return CACert{}, fmt.Errorf("signing caCrt: %w", err)
if err := caCert.Sign(privKey); err != nil {
return CACredentials{}, fmt.Errorf("signing caCert: %w", err)
}
caKeyPEM := cert.MarshalEd25519PrivateKey(privKey)
caCrtPem, err := caCrt.MarshalToPEM()
caCertPEM, err := caCert.MarshalToPEM()
if err != nil {
return CACert{}, fmt.Errorf("marshaling caCrt: %w", err)
return CACredentials{}, fmt.Errorf("marshaling caCert: %w", err)
}
return CACert{
CACert: string(caCrtPem),
CAKey: string(caKeyPEM),
return CACredentials{
CACertPEM: string(caCertPEM),
CAKeyPEM: string(caKeyPEM),
}, nil
}
// ValidateHostCertPEM checks if the given host certificate was signed by the
// given CA certificate, and returns ErrInvalidSignature if validation fails.
func ValidateHostCertPEM(caCertPEM, hostCertPEM string) error {
caCert, _, err := cert.UnmarshalNebulaCertificateFromPEM([]byte(caCertPEM))
if err != nil {
return fmt.Errorf("unmarshaling CA certificate as PEM: %w", err)
}
hostCert, _, err := cert.UnmarshalNebulaCertificateFromPEM([]byte(hostCertPEM))
if err != nil {
return fmt.Errorf("unmarshaling host certificate as PEM: %w", err)
}
caPubKey := ed25519.PublicKey(caCert.Details.PublicKey)
if !hostCert.CheckSignature(caPubKey) {
return ErrInvalidSignature
}
return nil
}
// IPFromHostCertPEM is a convenience function for parsing the IP of a host out
// of its nebula cert.
func IPFromHostCertPEM(hostCertPEM string) (net.IP, error) {
hostCert, _, err := cert.UnmarshalNebulaCertificateFromPEM([]byte(hostCertPEM))
if err != nil {
return nil, fmt.Errorf("unmarshaling host certificate as PEM: %w", err)
}
ips := hostCert.Details.Ips
if len(ips) == 0 {
return nil, fmt.Errorf("malformed nebula host cert: no IPs")
}
return ips[0].IP, nil
}
// SignAndWrap signs the given bytes using the keyPEM, and writes an
// encoded, versioned structure containing the signature and the given bytes.
func SignAndWrap(into io.Writer, keyPEM string, b []byte) error {
key, _, err := cert.UnmarshalEd25519PrivateKey([]byte(keyPEM))
if err != nil {
return fmt.Errorf("unmarshaling private key: %w", err)
}
sig, err := key.Sign(rand.Reader, b, crypto.Hash(0))
if err != nil {
return fmt.Errorf("generating signature: %w", err)
}
if _, err := into.Write([]byte("0")); err != nil {
return fmt.Errorf("writing version byte: %w", err)
}
err = pem.Encode(into, &pem.Block{
Type: "SIGNATURE",
Bytes: sig,
})
if err != nil {
return fmt.Errorf("writing PEM encoding of signature: %w", err)
}
if _, err := into.Write(b); err != nil {
return fmt.Errorf("writing input bytes: %w", err)
}
return nil
}
// Unwrap reads a stream of bytes which was produced by SignAndWrap, and returns
// the original inpute to SignAndWrap as well as the signature which was
// created. ValidateSignature can be used to validate the signature.
func Unwrap(from io.Reader) (b, sig []byte, err error) {
full, err := io.ReadAll(from)
if err != nil {
return nil, nil, fmt.Errorf("reading full input: %w", err)
} else if len(full) < 3 {
return nil, nil, fmt.Errorf("input too small")
} else if full[0] != '0' {
return nil, nil, fmt.Errorf("unexpected version byte: %d", full[0])
}
full = full[1:]
pemBlock, rest := pem.Decode(full)
if pemBlock == nil {
return nil, nil, fmt.Errorf("PEM-encoded signature could not be decoded")
}
return rest, pemBlock.Bytes, nil
}
// ValidateSignature can be used to validate a signature produced by Unwrap.
func ValidateSignature(certPEM string, b, sig []byte) error {
cert, _, err := cert.UnmarshalNebulaCertificateFromPEM([]byte(certPEM))
if err != nil {
return fmt.Errorf("unmarshaling certificate as PEM: %w", err)
}
pubKey := ed25519.PublicKey(cert.Details.PublicKey)
if !ed25519.Verify(pubKey, b, sig) {
return ErrInvalidSignature
}
return nil
}

77
entrypoint/src/nebula/nebula_test.go Normal file
View File

@ -0,0 +1,77 @@
package nebula
import (
"bytes"
"errors"
"net"
"testing"
)
var (
ip net.IP
ipNet *net.IPNet
caCredsA, caCredsB CACredentials
)
func init() {
var err error
ip, ipNet, err = net.ParseCIDR("192.168.0.1/24")
if err != nil {
panic(err)
}
caCredsA, err = NewCACredentials("a.example.com", ipNet)
if err != nil {
panic(err)
}
caCredsB, err = NewCACredentials("b.example.com", ipNet)
if err != nil {
panic(err)
}
}
func TestValidateHostCredentials(t *testing.T) {
hostCreds, err := NewHostCredentials(caCredsA, "foo", ip)
if err != nil {
t.Fatal(err)
}
err = ValidateHostCertPEM(hostCreds.CACertPEM, hostCreds.HostCertPEM)
if err != nil {
t.Fatal(err)
}
err = ValidateHostCertPEM(caCredsB.CACertPEM, hostCreds.HostCertPEM)
if !errors.Is(err, ErrInvalidSignature) {
t.Fatalf("expected ErrInvalidSignature, got %v", err)
}
}
func TestSignAndWrap(t *testing.T) {
b := []byte("foo bar baz")
buf := new(bytes.Buffer)
if err := SignAndWrap(buf, caCredsA.CAKeyPEM, b); err != nil {
t.Fatal(err)
}
gotB, gotSig, err := Unwrap(buf)
if err != nil {
t.Fatal(err)
} else if !bytes.Equal(b, gotB) {
t.Fatalf("got %q but expected %q", gotB, b)
}
if err := ValidateSignature(caCredsA.CACertPEM, b, gotSig); err != nil {
t.Fatal(err)
}
if err := ValidateSignature(caCredsB.CACertPEM, b, gotSig); !errors.Is(err, ErrInvalidSignature) {
t.Fatalf("expected ErrInvalidSignature but got %v", err)
}
}