#include "gssapiP_generic.h"
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#include <limits.h>
static unsigned int der_length_size(length)
int length;
{
if (length < (1<<7))
return(1);
else if (length < (1<<8))
return(2);
#if INT_MAX == 0x7fff
else
return(3);
#else
else if (length < (1<<16))
return(3);
else if (length < (1<<24))
return(4);
else
return(5);
#endif
}
static void der_write_length(buf, length)
unsigned char **buf;
int length;
{
if (length < (1<<7)) {
*(*buf)++ = (unsigned char) length;
} else {
*(*buf)++ = (unsigned char) (der_length_size(length)+127);
#if INT_MAX > 0x7fff
if (length >= (1<<24))
*(*buf)++ = (unsigned char) (length>>24);
if (length >= (1<<16))
*(*buf)++ = (unsigned char) ((length>>16)&0xff);
#endif
if (length >= (1<<8))
*(*buf)++ = (unsigned char) ((length>>8)&0xff);
*(*buf)++ = (unsigned char) (length&0xff);
}
}
static int der_read_length(buf, bufsize)
unsigned char **buf;
int *bufsize;
{
unsigned char sf;
int ret;
if (*bufsize < 1)
return(-1);
sf = *(*buf)++;
(*bufsize)--;
if (sf & 0x80) {
if ((sf &= 0x7f) > ((*bufsize)-1))
return(-1);
if (sf > sizeof(int))
return (-1);
ret = 0;
for (; sf; sf--) {
ret = (ret<<8) + (*(*buf)++);
(*bufsize)--;
}
} else {
ret = sf;
}
return(ret);
}
unsigned int g_token_size(mech, body_size)
const gss_OID_desc * mech;
unsigned int body_size;
{
body_size += 4 + (int) mech->length;
return(1 + der_length_size(body_size) + body_size);
}
void g_make_token_header(mech, body_size, buf, tok_type)
const gss_OID_desc * mech;
unsigned int body_size;
unsigned char **buf;
int tok_type;
{
*(*buf)++ = 0x60;
der_write_length(buf, (tok_type == -1) ?2:4 + mech->length + body_size);
*(*buf)++ = 0x06;
*(*buf)++ = (unsigned char) mech->length;
TWRITE_STR(*buf, mech->elements, mech->length);
if (tok_type != -1) {
*(*buf)++ = (unsigned char) ((tok_type>>8)&0xff);
*(*buf)++ = (unsigned char) (tok_type&0xff);
}
}
gss_int32 g_verify_token_header(mech, body_size, buf_in, tok_type, toksize_in,
wrapper_required)
const gss_OID_desc * mech;
unsigned int *body_size;
unsigned char **buf_in;
int tok_type;
unsigned int toksize_in;
int wrapper_required;
{
unsigned char *buf = *buf_in;
int seqsize;
gss_OID_desc toid;
int toksize = toksize_in;
if ((toksize-=1) < 0)
return(G_BAD_TOK_HEADER);
if (*buf++ != 0x60) {
if (wrapper_required)
return(G_BAD_TOK_HEADER);
buf--;
toksize++;
goto skip_wrapper;
}
if ((seqsize = der_read_length(&buf, &toksize)) < 0)
return(G_BAD_TOK_HEADER);
if (seqsize != toksize)
return(G_BAD_TOK_HEADER);
if ((toksize-=1) < 0)
return(G_BAD_TOK_HEADER);
if (*buf++ != 0x06)
return(G_BAD_TOK_HEADER);
if ((toksize-=1) < 0)
return(G_BAD_TOK_HEADER);
toid.length = *buf++;
if ((toksize-=toid.length) < 0)
return(G_BAD_TOK_HEADER);
toid.elements = buf;
buf+=toid.length;
if (! g_OID_equal(&toid, mech))
return G_WRONG_MECH;
skip_wrapper:
if (tok_type != -1) {
if ((toksize-=2) < 0)
return(G_BAD_TOK_HEADER);
if ((*buf++ != ((tok_type>>8)&0xff)) ||
(*buf++ != (tok_type&0xff)))
return(G_WRONG_TOKID);
}
*buf_in = buf;
*body_size = toksize;
return 0;
}