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Add support for using CA certs for upstream ssh connection (#210)

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This commit is contained in:
Matthew Atkinson 2023-08-25 17:32:49 -07:00 • committed by GitHub
parent 36f03e7a74
commit 13fcc8c0a8
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
12 changed files with 473 additions and 250 deletions
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18
cmd/sshpiperd/internal/plugin/grpc.go
View file

@ -332,6 +332,24 @@ func (g *GrpcPlugin) createUpstream(conn ssh.ConnMetadata, challengeCtx ssh.Chal
if err != nil {
return nil, err
}
if caPublicKeyByte := a.GetCaPublicKey(); caPublicKeyByte != nil {
caPublicKey, _, _, _, err := ssh.ParseAuthorizedKey(caPublicKeyByte)
if err != nil {
return nil, err
}
caCertificate, ok := caPublicKey.(*ssh.Certificate)
if !ok {
return nil, fmt.Errorf("Failed to convert the caPublicKey to an ssh.Certificate")
}
private, err = ssh.NewCertSigner(caCertificate, private)
if err != nil {
return nil, err
}
}
config.Auth = append(config.Auth, ssh.PublicKeys(private))
auth = append(auth, "privatekey")
}

60
e2e/ca_test.go Normal file
View file

@ -0,0 +1,60 @@
package e2e_test
import (
"fmt"
"testing"
"time"
"github.com/google/uuid"
)
func TestCa(t *testing.T) {
piperaddr, piperport := nextAvailablePiperAddress()
piper, _, _, err := runCmd("/sshpiperd/sshpiperd",
"-p",
piperport,
"/sshpiperd/plugins/testcaplugin",
"--target",
"host-capublickey:2222",
)
if err != nil {
t.Errorf("failed to run sshpiperd: %v", err)
}
defer killCmd(piper)
waitForEndpointReady(piperaddr)
randtext := uuid.New().String()
targetfie := uuid.New().String()
c, stdin, stdout, err := runCmd(
"ssh",
"-v",
"-o",
"StrictHostKeyChecking=no",
"-o",
"UserKnownHostsFile=/dev/null",
"-p",
piperport,
"-l",
"client_123",
"127.0.0.1",
fmt.Sprintf(`sh -c "echo -n %v > /shared/%v"`, randtext, targetfie),
)
if err != nil {
t.Errorf("failed to ssh to piper-fixed, %v", err)
}
defer killCmd(c)
enterPassword(stdin, stdout, "pass")
time.Sleep(time.Second) // wait for file flush
checkSharedFileContent(t, targetfie, randtext)
}

19
e2e/cahost/Dockerfile Normal file
View file

@ -0,0 +1,19 @@
FROM debian:bookworm-slim
EXPOSE 2222
ENV DEBIAN_FRONTEND=noninteractive
COPY ca.pub /etc/ssh/trusted-ca.pub
RUN apt -y update \
&& apt -y install --no-install-recommends --no-install-suggests openssh-server \
&& mkdir -p /run/sshd \
&& adduser --disabled-password --gecos "" client_123 \
&& passwd -d client_123 \
&& rm -rf /var/lib/apt/lists/*
COPY sshd_config /etc/ssh/sshd_config
ENTRYPOINT ["/usr/sbin/sshd", "-D", "-e", "-f", "/etc/ssh/sshd_config"]

7
e2e/cahost/ca Normal file
View file

@ -0,0 +1,7 @@
-----BEGIN OPENSSH PRIVATE KEY-----
b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
QyNTUxOQAAACCa8wnkN2vpvD5wPylJiviQHwtbTO0htoJBpltvZ149ZwAAAJCXKgKTlyoC
kwAAAAtzc2gtZWQyNTUxOQAAACCa8wnkN2vpvD5wPylJiviQHwtbTO0htoJBpltvZ149Zw
AAAEDt/vP5TaisrihzBV6UwHTFH4PwXtRz6MpWrbjmCciBgprzCeQ3a+m8PnA/KUmK+JAf
C1tM7SG2gkGmW29nXj1nAAAAC3BnaWJzb25Ad3NsAQI=
-----END OPENSSH PRIVATE KEY-----

1
e2e/cahost/ca.pub Normal file
View file

@ -0,0 +1 @@
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJrzCeQ3a+m8PnA/KUmK+JAfC1tM7SG2gkGmW29nXj1n

23
e2e/cahost/sshd_config Normal file
View file

@ -0,0 +1,23 @@
Port 2222
# Trust our CA
TrustedUserCAKeys /etc/ssh/trusted-ca.pub
# Allow pubkey
PubkeyAuthentication yes
# Don't allow passwords
PasswordAuthentication no
# Don't allow host auth
HostbasedAuthentication no
# No challenge response
ChallengeResponseAuthentication no
# Allow client to pass locale environment variables
AcceptEnv LANG LC_*
# override default of no subsystems
Subsystem sftp /usr/lib/openssh/sftp-server
# Change this if you have issues
LogLevel INFO

12
e2e/docker-compose.yml
View file

@ -31,6 +31,17 @@ services:
volumes:
- shared:/shared
- sshconfig_publickey:/config
host-capublickey:
build: ./cahost
labels:
- sshpiper.port=2222
- sshpiper.network=e2e_default
volumes:
- shared:/shared
networks:
- default
host-k8s-proxy:
build: ./kubetools
@ -89,6 +100,7 @@ services:
depends_on:
- host-publickey
- host-password
- host-capublickey
- host-k8s-proxy
# ensure sshpiperd image works

5
e2e/e2eentry.sh
View file

@ -3,6 +3,11 @@
# use entrypoint.sh to generate the ssh_host_ed25519_key
PLUGIN="dummy_badname/" bash /sshpiperd/entrypoint.sh 2>/dev/null
# Create an ssh key pair and then sign the public key with the ca cert
chmod 600 cahost/ca
ssh-keygen -t ssh-ed25519 -f /etc/ssh/ssh_user -N ""
ssh-keygen -s cahost/ca -I ssh_user -n client_123 /etc/ssh/ssh_user.pub
if [ "${SSHPIPERD_DEBUG}" == "1" ]; then
echo "enter debug on hold mode"
echo "run [docker exec -ti e2e_testrunner_1 bash] to run to attach"

507
libplugin/plugin.pb.go
View file

@ -379,7 +379,8 @@ type UpstreamPrivateKeyAuth struct {
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
PrivateKey []byte `protobuf:"bytes,1,opt,name=private_key,json=privateKey,proto3" json:"private_key,omitempty"`
PrivateKey []byte `protobuf:"bytes,1,opt,name=private_key,json=privateKey,proto3" json:"private_key,omitempty"`
CaPublicKey []byte `protobuf:"bytes,2,opt,name=ca_public_key,json=caPublicKey,proto3" json:"ca_public_key,omitempty"`
}
func (x *UpstreamPrivateKeyAuth) Reset() {
@ -421,6 +422,13 @@ func (x *UpstreamPrivateKeyAuth) GetPrivateKey() []byte {
return nil
}
func (x *UpstreamPrivateKeyAuth) GetCaPublicKey() []byte {
if x != nil {
return x.CaPublicKey
}
return nil
}
type UpstreamRemoteSignerAuth struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
@ -1435,6 +1443,7 @@ type KeyboardInteractiveAuthMessage struct {
unknownFields protoimpl.UnknownFields
// Types that are assignable to Message:
//
// *KeyboardInteractiveAuthMessage_PromptRequest
// *KeyboardInteractiveAuthMessage_UserResponse
// *KeyboardInteractiveAuthMessage_MetaRequest
@ -2148,264 +2157,266 @@ var file_plugin_proto_rawDesc = []byte{
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}
var (

1
libplugin/plugin.proto
View file

@ -35,6 +35,7 @@ message UpstreamPasswordAuth {
message UpstreamPrivateKeyAuth {
bytes private_key = 1;
bytes ca_public_key = 2;
}
message UpstreamRemoteSignerAuth{

9
libplugin/util.go
View file

@ -111,10 +111,15 @@ func CreatePasswordAuthFromString(password string) *Upstream_Password {
}
}
func CreatePrivateKeyAuth(key []byte) *Upstream_PrivateKey {
func CreatePrivateKeyAuth(key []byte, optionalSignedCaPublicKey ...[]byte) *Upstream_PrivateKey {
var caPublicKey []byte
if len(optionalSignedCaPublicKey) > 0 {
caPublicKey = optionalSignedCaPublicKey[0]
}
return &Upstream_PrivateKey{
PrivateKey: &UpstreamPrivateKeyAuth{
PrivateKey: key,
PrivateKey: key,
CaPublicKey: caPublicKey,
},
}
}

61
plugin/testcaplugin/main.go Normal file
View file

@ -0,0 +1,61 @@
//go:build full || e2e
package main
import (
"fmt"
"os"
"github.com/tg123/sshpiper/libplugin"
"github.com/urfave/cli/v2"
)
func main() {
libplugin.CreateAndRunPluginTemplate(&libplugin.PluginTemplate{
Name: "testcaplugin",
Usage: "Plugin to test ca public cert auth",
Flags: []cli.Flag{
&cli.StringFlag{
Name: "target",
Usage: "target ssh endpoint address",
EnvVars: []string{"SSHPIPERD_FIXED_TARGET"},
Required: true,
},
},
CreateConfig: func(c *cli.Context) (*libplugin.SshPiperPluginConfig, error) {
target := c.String("target")
host, port, err := libplugin.SplitHostPortForSSH(target)
if err != nil {
return nil, err
}
return &libplugin.SshPiperPluginConfig{
PasswordCallback: func(conn libplugin.ConnMetadata, password []byte) (*libplugin.Upstream, error) {
if string(password) != "pass" {
return nil, fmt.Errorf("Password is incorrect")
}
// Load the private key
signer, err := os.ReadFile("/etc/ssh/ssh_user")
if err != nil {
return nil, fmt.Errorf("unable to read private key: %v", err)
}
// Load the public ca certificate
capublickey, err := os.ReadFile("/etc/ssh/ssh_user-cert.pub")
if err != nil {
return nil, fmt.Errorf("unable to read ca cert: %v", err)
}
return &libplugin.Upstream{
Host: host,
Port: int32(port),
IgnoreHostKey: true,
Auth: libplugin.CreatePrivateKeyAuth(signer, capublickey),
}, nil
},
}, nil
},
})
}