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/*
* Construct an X11 greeting packet, including making up the right
* authorisation data.
*/
#include "putty.h"
#include "ssh.h"
void *x11_make_greeting(int endian, int protomajor, int protominor,
int auth_proto, const void *auth_data, int auth_len,
const char *peer_addr, int peer_port,
int *outlen)
{
unsigned char *greeting;
unsigned char realauthdata[64];
const char *authname;
const unsigned char *authdata;
int authnamelen, authnamelen_pad;
int authdatalen, authdatalen_pad;
int greeting_len;
authname = x11_authnames[auth_proto];
authnamelen = strlen(authname);
authnamelen_pad = (authnamelen + 3) & ~3;
if (auth_proto == X11_MIT) {
authdata = auth_data;
authdatalen = auth_len;
} else if (auth_proto == X11_XDM && auth_len == 16) {
time_t t;
unsigned long peer_ip = 0;
x11_parse_ip(peer_addr, &peer_ip);
authdata = realauthdata;
authdatalen = 24;
memset(realauthdata, 0, authdatalen);
memcpy(realauthdata, auth_data, 8);
PUT_32BIT_MSB_FIRST(realauthdata+8, peer_ip);
PUT_16BIT_MSB_FIRST(realauthdata+12, peer_port);
t = time(NULL);
PUT_32BIT_MSB_FIRST(realauthdata+14, t);
des_encrypt_xdmauth((char *)auth_data + 9, realauthdata, authdatalen);
} else {
authdata = realauthdata;
authdatalen = 0;
}
authdatalen_pad = (authdatalen + 3) & ~3;
greeting_len = 12 + authnamelen_pad + authdatalen_pad;
greeting = snewn(greeting_len, unsigned char);
memset(greeting, 0, greeting_len);
greeting[0] = endian;
PUT_16BIT_X11(endian, greeting+2, protomajor);
PUT_16BIT_X11(endian, greeting+4, protominor);
PUT_16BIT_X11(endian, greeting+6, authnamelen);
PUT_16BIT_X11(endian, greeting+8, authdatalen);
memcpy(greeting+12, authname, authnamelen);
memcpy(greeting+12+authnamelen_pad, authdata, authdatalen);
smemclr(realauthdata, sizeof(realauthdata));
*outlen = greeting_len;
return greeting;
}
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