/
config_processor.go
262 lines (235 loc) · 7.71 KB
/
config_processor.go
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package radius
import (
"context"
"encoding/json"
"encoding/pem"
"errors"
"fmt"
"os"
"strings"
"github.com/Azure/azure-sdk-for-go/sdk/security/keyvault/azsecrets"
"github.com/rs/zerolog/log"
agentclient "github.com/stephenzsy/small-kms/backend/agent/client"
agentcommon "github.com/stephenzsy/small-kms/backend/agent/common"
"github.com/stephenzsy/small-kms/backend/agent/configmanager"
frconfig "github.com/stephenzsy/small-kms/backend/agent/freeradiusconfig"
"github.com/stephenzsy/small-kms/backend/base"
)
type radiusConfigProcessHandler struct {
agentEnv *agentcommon.AgentEnv
configDir configmanager.ConfigDir
hasLoaded bool
processed ProcessedRadiusConfig
}
// After implements configmanager.ContextConfigHandler.
func (*radiusConfigProcessHandler) After(c context.Context) (context.Context, error) {
return c, nil
}
// Before implements configmanager.ContextConfigHandler.
func (h *radiusConfigProcessHandler) Before(c context.Context) (context.Context, error) {
config, ok := c.Value(contextKeyRadiusConfig).(*AgentConfigRadius)
if !ok || config == nil {
return c, nil
}
logger := log.Ctx(c)
logger.Debug().Msg("radiusConfigProcessHandler.Before - begin")
defer logger.Debug().Msg("radiusConfigProcessHandler.Before - done")
if !h.hasLoaded {
h.hasLoaded = true
readyCfgPath := h.configDir.Active().File("config.ready.json")
readyCfg, err := readyCfgPath.ReadFile()
if err != nil {
if !errors.Is(err, os.ErrNotExist) {
logger.Error().Err(err).Msgf("failed to read %s", readyCfgPath.Path())
}
} else if err := json.Unmarshal(readyCfg, &h.processed); err != nil {
logger.Error().Err(err).Msgf("failed to unmarshal JSON: %s", readyCfgPath.Path())
}
}
if h.processed.ConfigVersion == config.Version {
h.processed.fetchedConfig = config
return context.WithValue(c, contextKeyRadiusConfigProcessed, &h.processed), nil
}
processor := radiusConfigProcessor{
config: config,
configDir: h.configDir,
agentEnv: h.agentEnv,
}
processed, err := processor.process(c)
if err != nil {
return c, err
}
h.processed = *processed
h.processed.ConfigVersion = config.Version
h.processed.fetchedConfig = config
processedJson, err := json.Marshal(&h.processed)
if err != nil {
return c, err
}
if err := h.configDir.Versioned(config.Version).File("config.ready.json").WriteFile(processedJson); err != nil {
return c, err
}
return context.WithValue(c, contextKeyRadiusConfigProcessed, &h.processed), nil
}
var _ configmanager.ContextConfigHandler = (*radiusConfigProcessHandler)(nil)
func NewRadiusConfigProcessHandler(agentEnv *agentcommon.AgentEnv, configDir configmanager.ConfigDir) *radiusConfigProcessHandler {
return &radiusConfigProcessHandler{
configDir: configDir,
agentEnv: agentEnv,
}
}
type ProcessedRadiusConfig struct {
ContainerVersion string `json:"containerVersion"`
ConfigVersion string `json:"configVersion"`
HostBinds []string `json:"hostBinds"`
fetchedConfig *AgentConfigRadius
}
type radiusConfigProcessor struct {
configDir configmanager.ConfigDir
config *AgentConfigRadius
agentEnv *agentcommon.AgentEnv
agentClient agentclient.ClientWithResponsesInterface
}
func (p *radiusConfigProcessor) process(c context.Context) (*ProcessedRadiusConfig, error) {
pc := &ProcessedRadiusConfig{}
if p.agentClient == nil {
if client, err := p.agentEnv.AgentClient(); err != nil {
return nil, err
} else {
p.agentClient = client
}
}
if configPath, err := p.processClients(c); err != nil {
return nil, err
} else {
pc.HostBinds = append(pc.HostBinds, configPath+":/opt/etc/raddb/clients.conf:ro")
}
if hostBindings, err := p.processEAP(c); err != nil {
return nil, err
} else {
pc.HostBinds = append(pc.HostBinds, hostBindings...)
}
if hostBinding, err := p.processServers(c); err != nil {
return nil, err
} else {
pc.HostBinds = append(pc.HostBinds, hostBinding)
}
return pc, nil
}
func (p *radiusConfigProcessor) processClients(c context.Context) (string, error) {
logger := log.Ctx(c)
configPath := p.configDir.Versioned(p.config.Version).File("raddb", "clients.conf")
if err := configPath.EnsureDirExist(); err != nil {
return "", err
}
clients := p.config.Clients
kvSClient, err := p.agentEnv.AzSecretsClient()
if err != nil {
return "", err
}
for i, client := range clients {
if client.SecretId == "" {
continue
}
// pull secret
resp, err := p.agentClient.GetSecretWithResponse(c, base.NamespaceKindServicePrincipal, "me", client.SecretId, nil)
if err != nil {
return "", err
}
if resp.JSON200 == nil {
return "", fmt.Errorf("no secret returned, status code %d", resp.StatusCode())
}
secretRef := azsecrets.ID(resp.JSON200.Sid)
kvResp, err := kvSClient.GetSecret(c, secretRef.Name(), secretRef.Version(), nil)
logger.Debug().Msgf("retrieved secret %s", secretRef)
if err != nil {
return "", err
}
clients[i].Secret = *kvResp.Value
}
sb := &strings.Builder{}
if err := frconfig.FreeRadiusConfigList[frconfig.RadiusClientConfig](clients).MarshalFreeradiusConfig(sb, ""); err != nil {
return "", err
}
if err := configPath.WriteFile([]byte(sb.String())); err != nil {
return "", err
}
return configPath.Path(), nil
}
func (p *radiusConfigProcessor) processEAP(c context.Context) ([]string, error) {
logger := log.Ctx(c)
// fetch server cert
kvSClient, err := p.agentEnv.AzSecretsClient()
if err != nil {
return nil, err
}
certResp, err := p.agentClient.GetCertificateWithResponse(c, base.NamespaceKindServicePrincipal, "me",
p.config.EapTls.CertId)
if err != nil {
return nil, err
}
if certResp.JSON200 == nil {
return nil, fmt.Errorf("no certificate returned, status code %d", certResp.StatusCode())
}
kvSecretID := azsecrets.ID(certResp.JSON200.KeyVaultSecretID)
if kvSecretID == "" {
return nil, fmt.Errorf("no keyvault secret id returned, status code %d", certResp.StatusCode())
}
kvResp, err := kvSClient.GetSecret(c, kvSecretID.Name(), kvSecretID.Version(), nil)
if err != nil {
return nil, err
}
logger.Info().Msgf("retrieved secret %s", kvSecretID)
pemBytes := []byte(*kvResp.Value)
raddbCertsDir := p.configDir.Versioned(p.config.Version).Dir("raddb", "certs")
serverCertPath := raddbCertsDir.File("server.pem")
if err := serverCertPath.EnsureDirExist(); err != nil {
return nil, err
}
if err := serverCertPath.WriteFile(pemBytes); err != nil {
return nil, err
}
// write CA file
if len(certResp.JSON200.Jwk.CertificateChain) >= 2 {
caCertPem := pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: []byte(certResp.JSON200.Jwk.CertificateChain[1]),
})
caCertPath := raddbCertsDir.File("ca.pem")
if err := caCertPath.WriteFile(caCertPem); err != nil {
return nil, err
}
}
configPath := p.configDir.Versioned(p.config.Version).File("raddb", "mods-enabled", "eap")
if err := configPath.EnsureDirExist(); err != nil {
return nil, err
}
sb := &strings.Builder{}
if err := frconfig.MarshalModEAP(sb, ""); err != nil {
return nil, err
}
if err := configPath.WriteFile([]byte(sb.String())); err != nil {
return nil, err
}
return []string{
configPath.Path() + ":/opt/etc/raddb/mods-enabled/eap:ro",
raddbCertsDir.Path() + ":/opt/etc/raddb/certs:ro",
}, nil
}
func (p *radiusConfigProcessor) processServers(c context.Context) (string, error) {
configDir := p.configDir.Versioned(p.config.Version).Dir("raddb", "sites-enabled")
if err := configDir.EnsureDirExist(); err != nil {
return "", err
}
for _, server := range p.config.Servers {
configPath := configDir.File(server.Name)
sb := &strings.Builder{}
if err := server.MarshalFreeradiusConfig(sb, ""); err != nil {
return "", err
}
if err := configPath.WriteFile([]byte(sb.String())); err != nil {
return "", err
}
}
return configDir.Path() + ":/opt/etc/raddb/sites-enabled:ro", nil
}