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package main
import (
"fmt"
"io"
"log"
"os"
"github.com/elastic/go-libaudit/v2"
)
func read() error {
// Write netlink response to a file for further analysis or for writing
// tests cases.
var diagWriter io.Writer
if *diag != "" {
f, err := os.OpenFile(*diag, os.O_CREATE|os.O_RDWR|os.O_TRUNC, 0o600)
if err != nil {
return err
}
defer f.Close()
diagWriter = f
}
log.Println("starting netlink client")
var err error
var client *libaudit.AuditClient
if *receiveOnly {
client, err = libaudit.NewMulticastAuditClient(diagWriter)
if err != nil {
return fmt.Errorf("failed to create receive-only audit client: %w", err)
}
defer client.Close()
} else {
client, err = libaudit.NewAuditClient(diagWriter)
if err != nil {
return fmt.Errorf("failed to create audit client: %w", err)
}
defer client.Close()
status, err := client.GetStatus()
if err != nil {
return fmt.Errorf("failed to get audit status: %w", err)
}
log.Printf("received audit status=%+v", status)
if status.Enabled == 0 {
log.Println("enabling auditing in the kernel")
if err = client.SetEnabled(true, libaudit.WaitForReply); err != nil {
return fmt.Errorf("failed to set enabled=true: %w", err)
}
}
if status.RateLimit != uint32(*rate) {
log.Printf("setting rate limit in kernel to %v", *rate)
if err = client.SetRateLimit(uint32(*rate), libaudit.NoWait); err != nil {
return fmt.Errorf("failed to set rate limit to unlimited: %w", err)
}
}
if status.BacklogLimit != uint32(*backlog) {
log.Printf("setting backlog limit in kernel to %v", *backlog)
if err = client.SetBacklogLimit(uint32(*backlog), libaudit.NoWait); err != nil {
return fmt.Errorf("failed to set backlog limit: %w", err)
}
}
if status.Enabled != 2 && *immutable {
log.Printf("setting kernel settings as immutable")
if err = client.SetImmutable(libaudit.NoWait); err != nil {
return fmt.Errorf("failed to set kernel as immutable: %w", err)
}
}
log.Printf("sending message to kernel registering our PID (%v) as the audit daemon", os.Getpid())
if err = client.SetPID(libaudit.NoWait); err != nil {
return fmt.Errorf("failed to set audit PID: %w", err)
}
}
coroutine(client)
return nil
}
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