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Add HTTP health server (closes #115) #227

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d378b30
Add HTTP health server (closes #115)
keeganwitt Dec 7, 2024
4a0e3b6
PR feedback
keeganwitt Dec 12, 2024
6ac9f3f
More PR feedback
keeganwitt Dec 12, 2024
6b32bae
Fix DaemonModeFlagName const
keeganwitt Dec 12, 2024
b4b21f6
Make health check path configurable and implement default health chec…
keeganwitt Dec 13, 2024
8a61552
Merge remote-tracking branch 'upstream/main' into 115
keeganwitt Dec 13, 2024
07985d7
Keep ParseConfigFile in main
keeganwitt Dec 14, 2024
28885ec
Fix tests
keeganwitt Dec 14, 2024
1e7ccd1
Merge remote-tracking branch 'upstream/main' into 115
keeganwitt Dec 14, 2024
59af728
Upgrade golangci-lint to fix error
keeganwitt Dec 14, 2024
68a27ba
Update cmd/spiffe-helper/config/config.go
keeganwitt Dec 16, 2024
6084685
Update README.md
keeganwitt Dec 16, 2024
944d880
Fix remaining config renames
keeganwitt Dec 17, 2024
15928aa
Merge branch 'main' into 115
keeganwitt Dec 17, 2024
d8ff964
Add back flag duplication
keeganwitt Dec 17, 2024
1640761
Don't use a pointer for HealthCheckConfig
keeganwitt Dec 17, 2024
97019c6
Remove global variable
keeganwitt Dec 17, 2024
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40 changes: 21 additions & 19 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -18,25 +18,27 @@ The flag `-exitWhenReady` is also supported.
## Configuration
The configuration file is an [HCL](https://github.com/hashicorp/hcl) formatted file that defines the following configurations:

| Configuration | Description | Example Value |
|-------------------------------|----------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `agent_address` | Socket address of SPIRE Agent. | `"/tmp/agent.sock"` |
| `cmd` | The path to the process to launch. | `"ghostunnel"` |
| `cmd_args` | The arguments of the process to launch. | `"server --listen localhost:8002 --target localhost:8001--keystore certs/svid_key.pem --cacert certs/svid_bundle.pem --allow-uri-san spiffe://example.org/Database"` |
| `cert_dir` | Directory name to store the fetched certificates. This directory must be created previously. | `"certs"` |
| `daemon_mode` | Toggle running as a daemon, keeping X.509 and JWT up to date; or just fetch X.509 and JWT and exit 0 | `true` |
| `add_intermediates_to_bundle` | Add intermediate certificates into Bundle file instead of SVID file. | `true` |
| `renew_signal` | The signal that the process to be launched expects to reload the certificates. It is not supported on Windows. | `"SIGUSR1"` |
| `svid_file_name` | File name to be used to store the X.509 SVID public certificate in PEM format. | `"svid.pem"` |
| `svid_key_file_name` | File name to be used to store the X.509 SVID private key and public certificate in PEM format. | `"svid_key.pem"` |
| `svid_bundle_file_name` | File name to be used to store the X.509 SVID Bundle in PEM format. | `"svid_bundle.pem"` |
| `jwt_svids` | An array with the audience, optional extra audiences array, and file name to store the JWT SVIDs. File is Base64-encoded string). | `[{jwt_audience="your-audience", jwt_extra_audiences=["your-extra-audience-1", "your-extra-audience-2"], jwt_svid_file_name="jwt_svid.token"}]` |
| `jwt_bundle_file_name` | File name to be used to store JWT Bundle in JSON format. | `"jwt_bundle.json"` |
| `include_federated_domains` | Include trust domains from federated servers in the CA bundle. | `true` |
| `cert_file_mode` | The octal file mode to use when saving the X.509 public certificate file. | `0644` |
| `key_file_mode` | The octal file mode to use when saving the X.509 private key file. | `0600` |
| `jwt_bundle_file_mode` | The octal file mode to use when saving a JWT Bundle file. | `0600` |
| `jwt_svid_file_mode` | The octal file mode to use when saving a JWT SVID file. | `0600` |
| Configuration | Description | Example Value |
|-------------------------------|-----------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `agent_address` | Socket address of SPIRE Agent. | `"/tmp/agent.sock"` |
| `cmd` | The path to the process to launch. | `"ghostunnel"` |
| `cmd_args` | The arguments of the process to launch. | `"server --listen localhost:8002 --target localhost:8001--keystore certs/svid_key.pem --cacert certs/svid_bundle.pem --allow-uri-san spiffe://example.org/Database"` |
| `cert_dir` | Directory name to store the fetched certificates. This directory must be created previously. | `"certs"` |
| `daemon_mode` | Toggle running as a daemon, keeping X.509 and JWT up to date; or just fetch X.509 and JWT and exit 0 | `true` |
| `add_intermediates_to_bundle` | Add intermediate certificates into Bundle file instead of SVID file. | `true` |
| `renew_signal` | The signal that the process to be launched expects to reload the certificates. It is not supported on Windows. | `"SIGUSR1"` |
| `svid_file_name` | File name to be used to store the X.509 SVID public certificate in PEM format. | `"svid.pem"` |
| `svid_key_file_name` | File name to be used to store the X.509 SVID private key and public certificate in PEM format. | `"svid_key.pem"` |
| `svid_bundle_file_name` | File name to be used to store the X.509 SVID Bundle in PEM format. | `"svid_bundle.pem"` |
| `jwt_svids` | An array with the audience, optional extra audiences array, and file name to store the JWT SVIDs. File is Base64-encoded string). | `[{jwt_audience="your-audience", jwt_extra_audiences=["your-extra-audience-1", "your-extra-audience-2"], jwt_svid_file_name="jwt_svid.token"}]` |
| `jwt_bundle_file_name` | File name to be used to store JWT Bundle in JSON format. | `"jwt_bundle.json"` |
| `include_federated_domains` | Include trust domains from federated servers in the CA bundle. | `true` |
| `cert_file_mode` | The octal file mode to use when saving the X.509 public certificate file. | `0644` |
| `key_file_mode` | The octal file mode to use when saving the X.509 private key file. | `0600` |
| `jwt_bundle_file_mode` | The octal file mode to use when saving a JWT Bundle file. | `0600` |
| `jwt_svid_file_mode` | The octal file mode to use when saving a JWT SVID file. | `0600` |
| enable_health_check | Whether to start an HTTP server at `/healthz` with the daemon health. Doesn't apply for non-daemon mode. | `false` |
| health_check_port | The port to run the HTTP health server. | `8081` |

### Configuration example
```
Expand Down
7 changes: 7 additions & 0 deletions cmd/spiffe-helper/config/config.go
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Expand Up @@ -37,6 +37,8 @@ type Config struct {
IncludeFederatedDomains bool `hcl:"include_federated_domains"`
RenewSignal string `hcl:"renew_signal"`
DaemonMode *bool `hcl:"daemon_mode"`
EnableHealthCheck *bool `hcl:"enable_health_check"`
HealthCheckPort int `hcl:"health_check_port"`
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// x509 configuration
SVIDFileName string `hcl:"svid_file_name"`
Expand Down Expand Up @@ -158,6 +160,11 @@ func (c *Config) ValidateConfig(log logrus.FieldLogger) error {
c.JWTSVIDFileMode = defaultJWTSVIDFileMode
}

if c.EnableHealthCheck == nil {
defaultEnableHealthCheck := false
c.EnableHealthCheck = &defaultEnableHealthCheck
}

return nil
}

Expand Down
51 changes: 50 additions & 1 deletion cmd/spiffe-helper/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,11 +2,15 @@ package main

import (
"context"
"encoding/json"
"flag"
"fmt"
"net/http"
"os"
"os/signal"
"strconv"
"syscall"
"time"

"github.com/sirupsen/logrus"
"github.com/spiffe/spiffe-helper/cmd/spiffe-helper/config"
Expand All @@ -28,10 +32,17 @@ func main() {
os.Exit(1)
}

if err := startHealthServer(*configFile, *daemonModeFlag, log); err != nil {
log.WithError(err).Errorf("Error starting spiffe-helper health check server")
os.Exit(1)
}

log.Infof("Exiting")
os.Exit(0)
}

var spiffeSidecar *sidecar.Sidecar
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func startSidecar(configFile string, daemonModeFlag bool, log logrus.FieldLogger) error {
ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
defer stop()
Expand All @@ -48,7 +59,7 @@ func startSidecar(configFile string, daemonModeFlag bool, log logrus.FieldLogger
}

sidecarConfig := config.NewSidecarConfig(hclConfig, log)
spiffeSidecar := sidecar.New(sidecarConfig)
spiffeSidecar = sidecar.New(sidecarConfig)

if !*hclConfig.DaemonMode {
log.Info("Daemon mode disabled")
Expand All @@ -58,3 +69,41 @@ func startSidecar(configFile string, daemonModeFlag bool, log logrus.FieldLogger
log.Info("Launching daemon")
return spiffeSidecar.RunDaemon(ctx)
}

func startHealthServer(configFile string, daemonModeFlag bool, log logrus.FieldLogger) error {
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hclConfig, err := config.ParseConfig(configFile)
if err != nil {
return fmt.Errorf("failed to parse %q: %w", configFile, err)
}
hclConfig.ParseConfigFlagOverrides(daemonModeFlag, daemonModeFlagName)
if err := hclConfig.ValidateConfig(log); err != nil {
return fmt.Errorf("invalid configuration: %w", err)
}
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if *hclConfig.DaemonMode && *hclConfig.EnableHealthCheck {
http.HandleFunc("/healthz", func(w http.ResponseWriter, _ *http.Request) {
healthy := spiffeSidecar.CheckHealth()
if healthy {
_, err := w.Write([]byte(http.StatusText(http.StatusOK)))
log.Error(err)
if err != nil {
return
}
} else {
statusText := http.StatusText(http.StatusServiceUnavailable)
b, err := json.Marshal(spiffeSidecar.GetFileWritesSuccess())
if err != nil {
statusText = string(b)
}
http.Error(w, statusText, http.StatusServiceUnavailable)
}
})
server := &http.Server{
Addr: ":" + strconv.Itoa(hclConfig.HealthCheckPort),
ReadHeaderTimeout: 5 * time.Second,
WriteTimeout: 5 * time.Second,
}
log.Fatal(server.ListenAndServe())
}
return nil
}
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