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event change for upcomming connection #10

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Merged
maheshbhatiya73 merged 1 commit into from
Nov 6, 2025
Merged

event change for upcomming connection #10

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9 changes: 8 additions & 1 deletion secrds-agent/internal/processor/event.go
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Original file line number Diff line number Diff line change
Expand Up @@ -99,8 +99,15 @@ func (ep *EventProcessor) processSSHEvents(reader *perf.Reader) {
Timestamp: binary.LittleEndian.Uint64(record.RawSample[16:24]),
}

// Convert IP to string for logging
ipStr := fmt.Sprintf("%d.%d.%d.%d",
byte(event.IP>>24), byte(event.IP>>16), byte(event.IP>>8), byte(event.IP))

if err := ep.detector.ProcessSSHEvent(event.IP, event.Port, event.PID, event.EventType); err != nil {
fmt.Printf("Failed to process SSH event: %v\n", err)
fmt.Printf("Failed to process SSH event from %s: %v\n", ipStr, err)
} else {
// Log successful event processing (for debugging)
fmt.Printf("Processed SSH event: IP=%s, Port=%d\n", ipStr, event.Port)
}
}
}
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26 changes: 9 additions & 17 deletions secrds-programs/ssh_kprobe.c
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Original file line number Diff line number Diff line change
Expand Up @@ -62,25 +62,17 @@ int ssh_kprobe_accept(struct pt_regs *ctx)
return 0;
}

// Read source IP (skc_rcv_saddr) - offset 4-7 in sock_common
bpf_probe_read_kernel(&src_ip, sizeof(__u32), (char *)sk + 4);
// For incoming connections on the server:
// - skc_daddr (offset 0) = the remote client's IP address (what we want to track!)
// - skc_rcv_saddr (offset 4) = the server's bound local address (usually 0.0.0.0 or server IP)
// - skc_dport (offset 8) = destination port (22 for SSH)

// Read the remote client's IP directly from skc_daddr (offset 0-3)
// This is the IP of whoever is connecting TO the server
bpf_probe_read_kernel(&src_ip, sizeof(__u32), (char *)sk + 0);
src_ip = __builtin_bswap32(src_ip);

// Read destination IP (skc_daddr) - offset 0-3 in sock_common
bpf_probe_read_kernel(&dst_ip, sizeof(__u32), (char *)sk + 0);
dst_ip = __builtin_bswap32(dst_ip);

// For incoming connections, skc_rcv_saddr is the local bound address (usually 0.0.0.0 or server IP)
// and skc_daddr is the remote client's IP (what we want!)
// So we should use skc_daddr as the source IP for tracking

// Use destination address (skc_daddr) as the source IP for incoming connections
// This is the IP of the client connecting to us
if (dst_ip != 0) {
src_ip = dst_ip; // The "destination" from socket perspective is the client connecting to us
}

// If we still don't have a valid IP, skip
// If we don't have a valid client IP, skip
if (src_ip == 0) {
return 0;
}
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