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join_token.go
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join_token.go
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package jointoken
import (
"context"
"errors"
"fmt"
"net/url"
"path"
"sync"
"time"
"github.com/hashicorp/hcl"
spi "github.com/spiffe/spire/proto/common/plugin"
"github.com/spiffe/spire/proto/server/nodeattestor"
)
type JoinTokenConfig struct {
JoinTokens map[string]int `hcl:"join_tokens"`
}
type JoinTokenPlugin struct {
ConfigTime time.Time
joinTokens map[string]int
trustDomain string
mtx *sync.Mutex
}
func (p *JoinTokenPlugin) spiffeID(token string) *url.URL {
spiffePath := path.Join("spiffe", "node-id", token)
id := &url.URL{
Scheme: "spiffe",
Host: p.trustDomain,
Path: spiffePath,
}
return id
}
func (p *JoinTokenPlugin) Attest(stream nodeattestor.Attest_PluginStream) error {
req, err := stream.Recv()
if err != nil {
return err
}
joinToken := string(req.AttestationData.Data)
// OK to echo the token here because it becomes public knowledge after attestation
if req.AttestedBefore {
err := fmt.Errorf("Join token %s has been used and is no longer valid", joinToken)
return err
}
p.mtx.Lock()
defer p.mtx.Unlock()
tokenTTL, ok := p.joinTokens[joinToken]
if !ok {
err := errors.New("Unknown or expired join token")
return err
}
// Check for expiration
ttlDuration := time.Duration(tokenTTL) * time.Second
if time.Since(p.ConfigTime) > ttlDuration {
delete(p.joinTokens, joinToken)
err := errors.New("Expired join token")
return err
}
resp := &nodeattestor.AttestResponse{
Valid: true,
BaseSPIFFEID: p.spiffeID(joinToken).String(),
}
delete(p.joinTokens, joinToken)
return stream.Send(resp)
}
func (p *JoinTokenPlugin) Configure(ctx context.Context, req *spi.ConfigureRequest) (*spi.ConfigureResponse, error) {
resp := &spi.ConfigureResponse{}
// Parse HCL config payload into config struct
config := &JoinTokenConfig{}
hclTree, err := hcl.Parse(req.Configuration)
if err != nil {
resp.ErrorList = []string{err.Error()}
return resp, err
}
err = hcl.DecodeObject(&config, hclTree)
if err != nil {
resp.ErrorList = []string{err.Error()}
return resp, err
}
if req.GlobalConfig == nil {
err := errors.New("global configuration is required")
resp.ErrorList = []string{err.Error()}
return resp, err
}
if req.GlobalConfig.TrustDomain == "" {
err := errors.New("trust_domain is required")
resp.ErrorList = []string{err.Error()}
return resp, err
}
// Set local vars from config struct
p.mtx.Lock()
defer p.mtx.Unlock()
p.ConfigTime = time.Now()
p.joinTokens = config.JoinTokens
p.trustDomain = req.GlobalConfig.TrustDomain
return &spi.ConfigureResponse{}, nil
}
func (*JoinTokenPlugin) GetPluginInfo(context.Context, *spi.GetPluginInfoRequest) (*spi.GetPluginInfoResponse, error) {
return &spi.GetPluginInfoResponse{}, nil
}
func New() nodeattestor.Plugin {
return &JoinTokenPlugin{
mtx: &sync.Mutex{},
}
}