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Merged
maheshbhatiya73 merged 1 commit into from
Jul 8, 2025
Merged

feat(ssh-monitor): eBPF Rust probe with Go userspace loader for SSH t… #7

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31 changes: 31 additions & 0 deletions .gitignore
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# Binaries and object files
bin/
*.o
*.elf

# Rust build artifacts
**/target/
**/Cargo.lock

# Go build/test artifacts
*.test
*.out

# Logs
logs/
*.log

# Editor and system files
.DS_Store
*.swp
*.swo
*.bak
*.tmp

# IDE/editor folders
.vscode/
.idea/

# Node or frontend stuff (if added in future)
node_modules/
dist/
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25 changes: 0 additions & 25 deletions bpf/connect_count.c
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58 changes: 0 additions & 58 deletions bpf/ssh_monitor.c
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50 changes: 0 additions & 50 deletions bpf/udp_monitor.c
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12 changes: 12 additions & 0 deletions core/iputils.go
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package core

import (
"encoding/binary"
"net"
)

func FormatIPv4(ip uint32) string {
b := make([]byte, 4)
binary.LittleEndian.PutUint32(b, ip)
return net.IP(b).String()
}
95 changes: 93 additions & 2 deletions core/ssh.go
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@@ -1,11 +1,102 @@
package core

import (

"encoding/binary"
"fmt"
"log"
"net"
"os"
"os/signal"
"syscall"
"time"

"github.com/cilium/ebpf"
"github.com/cilium/ebpf/link"
)

// Must match the Rust struct `SshKey { pid: u32, ip: u32 }`
type sshKey struct {
PID uint32
IP uint32
}

func RunSSHMonitor() {
runMonitor("bin/ssh_monitor.o", "count_ssh", "ssh_attempts", "kprobe", "sys_connect")
const (
bpfFile = "bin/ssh_monitor.o"
progName = "trace_ssh"
mapName = "ssh_attempts"
)

fmt.Printf("Starting SSH monitor: %s on tracepoint sys_enter_connect\n", progName)

spec, err := ebpf.LoadCollectionSpec(bpfFile)
if err != nil {
log.Fatalf("Failed to load eBPF spec: %v", err)
}

coll, err := ebpf.NewCollection(spec)
if err != nil {
log.Fatalf("Failed to create eBPF collection: %v", err)
}
defer coll.Close()

prog, ok := coll.Programs[progName]
if !ok {
log.Fatalf("Program %s not found in .o file", progName)
}
defer prog.Close()

kprobe, err := link.Kprobe("tcp_v4_connect", prog, nil)
if err != nil {
log.Fatalf("Failed to attach kprobe: %v", err)
}
defer kprobe.Close()


m, ok := coll.Maps[mapName]
if !ok {
log.Fatalf("Map %s not found", mapName)
}
defer m.Close()

fmt.Println("eBPF program attached. Watching SSH connections every 3 seconds...")

sig := make(chan os.Signal, 1)
signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM)

ticker := time.NewTicker(3 * time.Second)
defer ticker.Stop()

for {
select {
case <-ticker.C:
iter := m.Iterate()
var key sshKey
var value uint32
total := uint32(0)

fmt.Println("[ssh_attempts] PID@IP -> Count")
for iter.Next(&key, &value) {
ipStr := formatIPv4(key.IP)
fmt.Printf(" %d@%s -> %d\n", key.PID, ipStr, value)
total += value
}

if err := iter.Err(); err != nil {
log.Printf("Map iteration error: %v", err)
}
fmt.Printf("[ssh_attempts] Total Attempts: %d\n\n", total)

case <-sig:
fmt.Println("Stopping SSH monitor...")
return
}
}
}

// Converts uint32 IP to dotted IPv4 string
func formatIPv4(ip uint32) string {
ipBytes := make([]byte, 4)
binary.LittleEndian.PutUint32(ipBytes, ip)
return net.IP(ipBytes).String()
}
9 changes: 1 addition & 8 deletions core/udp.go
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@@ -1,7 +1,6 @@
package core

import (
"encoding/binary"
"fmt"
"log"
"os"
Expand Down Expand Up @@ -78,7 +77,7 @@ func RunUDPMonitor() {

fmt.Println("[udp_attempts] PID@IP -> Count")
for iter.Next(&key, &value) {
ipStr := formatIPv4(key.DstIP)
ipStr := FormatIPv4(key.DstIP)
fmt.Printf(" %d@%s -> %d\n", key.PID, ipStr, value)
total += value
}
Expand All @@ -94,9 +93,3 @@ func RunUDPMonitor() {
}
}
}

func formatIPv4(n uint32) string {
b := make([]byte, 4)
binary.BigEndian.PutUint32(b, n)
return fmt.Sprintf("%d.%d.%d.%d", b[0], b[1], b[2], b[3])
}
9 changes: 9 additions & 0 deletions ebpf-programs/ssh_monitor/.gitignore
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### https://raw.github.com/github/gitignore/master/Rust.gitignore

# Generated by Cargo
# will have compiled files and executables
debug/
target/

# These are backup files generated by rustfmt
**/*.rs.bk
18 changes: 18 additions & 0 deletions ebpf-programs/ssh_monitor/Cargo.toml
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[package]
name = "ssh_monitor_ebpf"
version = "0.1.0"
edition = "2021"

[lib]
crate-type = ["staticlib"]
name = "ssh_monitor_ebpf"

[dependencies]
aya-ebpf = { version = "0.1.1", default-features = false }

[profile.release]
opt-level = "z"
lto = true
panic = "abort"
codegen-units = 1
strip = "debuginfo"
4 changes: 4 additions & 0 deletions ebpf-programs/ssh_monitor/rust-toolchain.toml
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[toolchain]
channel = "nightly"
components = ["rust-src"]
targets = ["bpfel-unknown-none"]
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