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provider.go
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/
provider.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package vault
import (
"context"
"fmt"
"io"
"net/http"
"os"
"time"
vaultclient "github.com/hashicorp/vault-client-go"
"github.com/hashicorp/vault-client-go/schema"
"github.com/pkg/browser"
"namespacelabs.dev/foundation/framework/secrets/combined"
"namespacelabs.dev/foundation/internal/console"
"namespacelabs.dev/foundation/internal/fnapi"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/tcache"
"namespacelabs.dev/foundation/std/cfg"
"namespacelabs.dev/foundation/std/tasks"
"namespacelabs.dev/foundation/universe/vault"
"namespacelabs.dev/go-ids"
)
const (
vaulTokenEnvKey = "VAULT_TOKEN"
vaultJwtAudience = "vault.namespace.systems"
oidcCallbackPort = 8250
oidcLoginTimeout = 5 * time.Minute
)
var (
vaultConfigType = cfg.DefineConfigType[*vault.VaultProvider]()
certificateConfigType = cfg.DefineConfigType[*vault.CertificateConfig]()
clients = tcache.NewCache[*vaultclient.Client]()
)
func GetVaultConfig(cfg cfg.Configuration) (*vault.VaultProvider, bool) {
return vaultConfigType.CheckGet(cfg)
}
func GetCertificateConfig(cfg cfg.Configuration) (*vault.CertificateConfig, bool) {
return certificateConfigType.CheckGet(cfg)
}
func Register() {
combined.RegisterSecretsProvider(appRoleProvider)
combined.RegisterSecretsProvider(certificateProvider)
combined.RegisterSecretsProvider(certificateAuthorityProvider)
combined.RegisterSecretsProvider(secretProvider)
}
func login(ctx context.Context, vaultCfg *vault.VaultProvider) (*vaultclient.Client, error) {
key := vaultCfg.GetAddress() + vaultCfg.GetNamespace() + vaultCfg.GetAuthMount()
return clients.Compute(key, func() (*vaultclient.Client, error) {
return tasks.Return(ctx, tasks.Action("vault.login").Arg("namespace", vaultCfg.GetNamespace()).Arg("address", vaultCfg.GetAddress()),
func(ctx context.Context) (*vaultclient.Client, error) {
client, err := vaultclient.New(
vaultclient.WithAddress(vaultCfg.GetAddress()),
vaultclient.WithRequestTimeout(vaultRequestTimeout),
withIssue257Workaround(),
)
if err != nil {
return nil, fnerrors.InvocationError("vault", "failed to create vault client: %w", err)
}
client.SetNamespace(vaultCfg.GetNamespace())
// Vault by default always prefers a token set in VAULT_TOKEN env var. We do the same.
// Useful in case of VAULT_TOKEN provided by the 3rd party (e.g. by CI, etc).
if token := os.Getenv(vaulTokenEnvKey); token != "" {
client.SetToken(token)
return client, nil
}
var vaultToken string
switch vaultCfg.GetAuthMethod() {
case "jwt":
token, err := jwtLogin(ctx, client, vaultCfg, vaultJwtAudience)
if err != nil {
return nil, err
}
vaultToken = token
case "oidc":
token, err := oidcLogin(ctx, client, vaultCfg)
if err != nil {
return nil, err
}
vaultToken = token
default:
return nil, fnerrors.BadDataError("unknown authentication method %q; valid methods: jwt, oidc", vaultCfg.AuthMethod)
}
client.SetToken(vaultToken)
return client, nil
},
)
})
}
func jwtLogin(ctx context.Context, client *vaultclient.Client, vaultCfg *vault.VaultProvider, audience string) (string, error) {
idTokenResp, err := fnapi.IssueIdToken(ctx, audience, 1)
if err != nil {
return "", err
}
loginResp, err := client.Auth.JwtLogin(ctx, schema.JwtLoginRequest{Jwt: idTokenResp.IdToken},
vaultclient.WithMountPath(vaultCfg.GetAuthMount()),
)
if err != nil {
return "", fnerrors.InvocationError("vault", "failed to login to vault: %w", err)
}
if loginResp.Auth == nil {
return "", fnerrors.InvocationError("vault", "missing vault login auth data: %w", err)
}
return loginResp.Auth.ClientToken, nil
}
func oidcLogin(ctx context.Context, client *vaultclient.Client, vaultCfg *vault.VaultProvider) (string, error) {
ctx, cancel := context.WithTimeout(ctx, oidcLoginTimeout)
defer cancel()
type callbackResponse struct {
code, state string
}
callbackCh := make(chan callbackResponse, 1)
callbackServer := &http.Server{
Addr: fmt.Sprintf("127.0.0.1:%d", oidcCallbackPort),
}
http.HandleFunc("/oidc/callback", func(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, "Login is sucessful! This page can be closed now.")
callbackCh <- callbackResponse{
code: r.URL.Query().Get("code"),
state: r.URL.Query().Get("state"),
}
})
go func() {
if err := callbackServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
fmt.Fprintf(console.Debug(ctx), "failed to start OIDC callback server: %v", err)
}
}()
defer callbackServer.Shutdown(ctx)
clientNonce := ids.NewRandomBase32ID(20)
r, err := client.Auth.JwtOidcRequestAuthorizationUrl(ctx,
schema.JwtOidcRequestAuthorizationUrlRequest{
ClientNonce: clientNonce,
RedirectUri: fmt.Sprintf("http://localhost:%d/oidc/callback", oidcCallbackPort),
},
vaultclient.WithMountPath(vaultCfg.GetAuthMount()),
)
if err != nil {
return "", fnerrors.InvocationError("vault", "failed to request OIDC authorization URL: %v", err)
}
authUrl, ok := r.Data["auth_url"].(string)
if !ok || authUrl == "" {
return "", fnerrors.InvocationError("vault", "returned invalid OIDC authorization URL")
}
fmt.Fprintf(console.Stdout(ctx), "Complete the login via your OIDC provider. Launching browser to:\n\n")
fmt.Fprintf(console.Stdout(ctx), "\t%s\n\n", authUrl)
if err := browser.OpenURL(authUrl); err != nil {
fmt.Fprintf(console.Debug(ctx), "failed to open browser: %v\n", err)
}
fmt.Fprintf(console.Stdout(ctx), "Waiting for OIDC authentication to complete...\n")
for {
select {
case resp := <-callbackCh:
r, err = client.Auth.JwtOidcCallback(ctx, clientNonce,
resp.code, resp.state,
vaultclient.WithMountPath(vaultCfg.GetAuthMount()),
)
if err != nil {
return "", fnerrors.InvocationError("vault", "failed to login using OIDC provider: %v", err)
}
return r.Auth.ClientToken, nil
case <-ctx.Done():
return "", fnerrors.InvocationError("vault", "OIDC login did not complete on time: %v", ctx.Err())
}
}
}