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/*
* decode_tds.c
*
* Tabular Data Stream (Sybase, Microsoft SQL). See www.freetds.org.
*
* Thanks to antilove!@#$% and Ben Lowery <blowery@monkey.org> for
* providing me with packet traces.
*
* Copyright (c) 2000 Dug Song <dugsong@monkey.org>
* Copyright (c) 2001 Paul van Maaren <P.v.Maaren@reseau.nl>
*
* $Id: decode_tds.c,v 1.10 2001/03/15 08:33:02 dugsong Exp $
*/
#include "config.h"
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <strlcat.h>
#include <arpa/inet.h>
#include "decode.h"
struct tds_hdr {
u_char type;
u_char last;
u_short size;
u_int32_t zero;
};
struct tds_login {
char hostname[30];
u_char hostlen;
char username[30];
u_char userlen;
char password[30];
u_char passlen;
char process[30];
u_char proclen;
char magic1[6];
u_char bulkcopy;
char magic2[9];
char appname[30];
u_char applen;
char servername[30];
u_char serverlen;
u_char zero;
u_char pass2len;
char password2[30];
char magic3[223];
u_char pass2len2;
char version[4];
char libname[10];
u_char liblen;
char magic4[3];
char language[30];
u_char langlen;
u_char nolang;
u_short magic5;
u_char encrypted;
char magic6[10];
char charset[30];
u_char charlen;
u_char magic7;
char blocksize[6];
u_char blocklen;
char magic8[4]; /* 4.2: 8, 4.6: 4, 5.0: 25 */
};
u_char tds7_magic1[] = {
0x6, 0x83, 0xf2, 0xf8, 0xff, 0x0, 0x0, 0x0, 0x0, 0xe0, 0x03, 0x0,
0x0, 0x88, 0xff, 0xff, 0xff, 0x36, 0x04, 0x00, 0x00
};
struct tds7_login {
u_short size;
char zero1[5];
u_char byte1; /* 0x70 */
char zero2[7];
char magic1[21];
u_short servpos;
u_short servlen;
u_short userpos; /* XXX - freetds got this wrong? */
u_short userlen;
u_short passpos;
u_short passlen;
u_short somepos;
u_short somelen;
u_short apppos;
u_short applen;
char zero4[4];
u_short libpos;
u_short liblen;
char skip1[8];
char magic2[6];
char skip2[8];
/* char servername[servlen]; */
/* char username[userlen]; */
/* char password[passlen]; */
/* char appname[applen]; */
/* char server[servlen]; */
/* char library[liblen]; */
/* char magic3[48]; */
};
static void
deunicode(u_char *buf, int len)
{
int i;
for (i = 0; i < len; i++) {
buf[i] = buf[i * 2];
}
buf[i] = '\0';
}
static void
tds7_decrypt(u_char *buf, int len)
{
int i;
for (i = 0; i < len; i++) {
buf[i] = ((buf[i] << 4) | (buf[i] >> 4)) ^ 0x5a;
}
buf[i] = '\0';
}
int
decode_tds(u_char *buf, int len, u_char *obuf, int olen)
{
struct tds_hdr *th;
struct tds_login *tl;
struct tds7_login *t7l, *myt7l;
u_char *user, *pass, *serv;
u_short userlen, passlen, servlen;
obuf[0] = '\0';
if (th->size != 8) {
/* wrong header length */
return (strlen(obuf));
}
for (th = (struct tds_hdr *)buf;
len > sizeof(*th) && len >= ntohs(th->size);
buf += ntohs(th->size), len -= ntohs(th->size)) {
if (th->type == 2) {
/* Version 4.x, 5.0 */
if (len < sizeof(*th) + sizeof(*tl))
return (0);
tl = (struct tds_login *)(th + 1);
if (tl->userlen > sizeof(tl->username))
return (0);
tl->username[tl->userlen] = '\0';
strlcat(obuf, tl->username, olen);
strlcat(obuf, "\n", olen);
if (tl->passlen > sizeof(tl->password))
return (0);
tl->password[tl->passlen] = '\0';
strlcat(obuf, tl->password, olen);
strlcat(obuf, "\n", olen);
}
else if (th->type == 16 && th->last == 1) {
/* Version 7.0 */
if (len < sizeof(*th) + sizeof(*t7l))
return (0);
t7l = (struct tds7_login *)(th + 1);
myt7l = (struct tds7_login *)(buf + sizeof(*th));
userlen = pletohs(&t7l->userlen);
passlen = pletohs(&t7l->passlen);
servlen = pletohs(&t7l->servlen);
if (len < sizeof(*th) + sizeof(*t7l) +
(2 * (userlen + passlen))) {
return (0);
}
serv = (u_char *)(t7l + 1);
deunicode(serv, servlen);
user = serv + (2 * servlen);
pass = user + (2 * userlen);
deunicode(user, userlen);
/* XXX - when to call? */
tds7_decrypt(pass, 2 * passlen);
deunicode(pass, passlen);
snprintf(obuf + strlen(obuf),
olen - strlen(obuf),
"%s\n%s\n", user, pass);
return(strlen(obuf));
}
}
return (strlen(obuf));
}
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