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ca.go
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ca.go
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package main
import (
"context"
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"errors"
"fmt"
"log/slog"
"net/http"
"github.com/RealImage/bifrost/cafiles"
"github.com/RealImage/bifrost/internal/webapp"
"github.com/RealImage/bifrost/tinyca"
"github.com/urfave/cli/v3"
)
// caServeCmd flags
var (
caHost string
caPort int64
webEnabled bool
webStaticPath string
exposeMetrics bool
)
var caServeCmd = &cli.Command{
Name: "serve",
Aliases: []string{"ca"},
Flags: []cli.Flag{
caCertFlag,
caPrivKeyFlag,
&cli.StringFlag{
Name: "host",
Usage: "listen on `HOST`",
Aliases: []string{"H"},
Sources: cli.EnvVars("HOST"),
Value: "localhost",
Destination: &caHost,
Action: func(_ context.Context, _ *cli.Command, h string) error {
if h == "" {
return errors.New("host cannot be empty")
}
return nil
},
},
&cli.IntFlag{
Name: "port",
Usage: "listen on `PORT`",
Aliases: []string{"p"},
Sources: cli.EnvVars("PORT"),
Value: 8008,
Destination: &caPort,
Action: func(_ context.Context, _ *cli.Command, p int64) error {
if p < 1 || p > 65535 {
return errors.New("port must be between 1 and 65535")
}
return nil
},
},
&cli.BoolFlag{
Name: "web",
Usage: "enable web interface",
Aliases: []string{"w"},
Sources: cli.EnvVars("WEB"),
Destination: &webEnabled,
},
&cli.StringFlag{
Name: "web-static-path",
Usage: "read web static files from `PATH`",
Sources: cli.EnvVars("WEB_STATIC_PATH"),
Destination: &webStaticPath,
},
&cli.BoolFlag{
Name: "metrics",
Usage: "expose Prometheus metrics",
Sources: cli.EnvVars("METRICS"),
Value: false,
Destination: &exposeMetrics,
},
},
Action: func(ctx context.Context, _ *cli.Command) error {
cert, key, err := cafiles.GetCertKey(ctx, caCertUri, caPrivKeyUri)
if err != nil {
return cli.Exit(fmt.Sprintf("Error reading cert/key: %s", err), 1)
}
mux := http.NewServeMux()
if exposeMetrics {
slog.DebugContext(ctx, "metrics enabled")
mux.HandleFunc("GET /metrics", webapp.MetricsHandler)
}
ca, err := tinyca.New(cert, key)
if err != nil {
return cli.Exit(fmt.Sprintf("Error creating CA: %s", err), 1)
}
mux.Handle("POST /issue", ca)
nss := cert.Namespace.String()
mux.HandleFunc("GET /namespace", func(w http.ResponseWriter, r *http.Request) {
fmt.Fprint(w, nss)
})
if webEnabled {
slog.DebugContext(ctx, "web enabled", "staticFiles", webStaticPath)
webapp.AddRoutes(mux, webStaticPath, cert.Namespace)
}
hdlr := webapp.RequestLogHandler(mux)
addr := fmt.Sprintf("%s:%d", caHost, caPort)
slog.InfoContext(ctx, "starting server", "address", addr, "namespace", nss)
server := http.Server{Addr: addr, Handler: hdlr}
if err := server.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
return cli.Exit(fmt.Sprintf("Error starting server: %s", err), 1)
}
return nil
},
}
var caIssueCmd = &cli.Command{
Name: "issue",
Flags: []cli.Flag{
caCertFlag,
caPrivKeyFlag,
clientPrivKeyFlag,
notBeforeFlag,
notAfterFlag,
outputFlag,
},
Action: func(ctx context.Context, _ *cli.Command) error {
caCert, caKey, err := cafiles.GetCertKey(ctx, caCertUri, caPrivKeyUri)
if err != nil {
return cli.Exit(fmt.Sprintf("Error reading cert/key: %s", err), 1)
}
ca, err := tinyca.New(caCert, caKey)
if err != nil {
return cli.Exit(fmt.Sprintf("Error creating CA: %s", err), 1)
}
clientKey, err := cafiles.GetPrivateKey(ctx, clientPrivKeyUri)
if err != nil {
return cli.Exit(fmt.Sprintf("Error reading client key: %s", err), 1)
}
csr, err := x509.CreateCertificateRequest(rand.Reader, &x509.CertificateRequest{
Subject: pkix.Name{
Organization: []string{caCert.Namespace.String()},
CommonName: clientKey.UUID(caCert.Namespace).String(),
},
}, clientKey)
if err != nil {
return cli.Exit(fmt.Sprintf("Error creating certificate request: %s", err), 1)
}
notBefore, notAfter, err := tinyca.ParseValidity(notBeforeTime, notAfterTime)
if err != nil {
return cli.Exit(fmt.Sprintf("Error parsing validity: %s", err), 1)
}
template := tinyca.TLSClientCertTemplate(notBefore, notAfter)
cert, err := ca.IssueCertificate(csr, template)
if err != nil {
return cli.Exit(fmt.Sprintf("Error issuing certificate: %s", err), 1)
}
out, err := getOutputWriter()
if err != nil {
return cli.Exit(fmt.Sprintf("Error getting output writer: %s", err), 1)
}
block := &pem.Block{
Type: "CERTIFICATE",
Bytes: cert,
}
fmt.Fprint(out, string(pem.EncodeToMemory(block)))
return nil
},
}