mirror of
https://github.com/samba-team/samba.git
synced 2024-12-23 17:34:34 +03:00
5e54558c6d
(This used to be commit b0132e94fc
)
489 lines
11 KiB
C
489 lines
11 KiB
C
/*
|
|
Unix SMB/CIFS implementation.
|
|
simple SPNEGO routines
|
|
Copyright (C) Andrew Tridgell 2001
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
|
|
/* free an asn1 structure */
|
|
void asn1_free(ASN1_DATA *data)
|
|
{
|
|
struct nesting *nesting = data->nesting;
|
|
|
|
while (nesting) {
|
|
struct nesting *nnext = nesting->next;
|
|
free(nesting);
|
|
nesting = nnext;
|
|
};
|
|
data->nesting = NULL;
|
|
SAFE_FREE(data->data);
|
|
}
|
|
|
|
/* write to the ASN1 buffer, advancing the buffer pointer */
|
|
BOOL asn1_write(ASN1_DATA *data, const void *p, int len)
|
|
{
|
|
if (data->has_error) return False;
|
|
if (data->length < data->ofs+len) {
|
|
data->data = SMB_REALLOC_ARRAY(data->data, unsigned char,
|
|
data->ofs+len);
|
|
if (!data->data) {
|
|
data->has_error = True;
|
|
return False;
|
|
}
|
|
data->length = data->ofs+len;
|
|
}
|
|
memcpy(data->data + data->ofs, p, len);
|
|
data->ofs += len;
|
|
return True;
|
|
}
|
|
|
|
/* useful fn for writing a uint8 */
|
|
BOOL asn1_write_uint8(ASN1_DATA *data, uint8 v)
|
|
{
|
|
return asn1_write(data, &v, 1);
|
|
}
|
|
|
|
/* push a tag onto the asn1 data buffer. Used for nested structures */
|
|
BOOL asn1_push_tag(ASN1_DATA *data, uint8 tag)
|
|
{
|
|
struct nesting *nesting;
|
|
|
|
asn1_write_uint8(data, tag);
|
|
nesting = SMB_MALLOC_P(struct nesting);
|
|
if (!nesting) {
|
|
data->has_error = True;
|
|
return False;
|
|
}
|
|
|
|
nesting->start = data->ofs;
|
|
nesting->next = data->nesting;
|
|
data->nesting = nesting;
|
|
return asn1_write_uint8(data, 0xff);
|
|
}
|
|
|
|
/* pop a tag */
|
|
BOOL asn1_pop_tag(ASN1_DATA *data)
|
|
{
|
|
struct nesting *nesting;
|
|
size_t len;
|
|
|
|
if (data->has_error) {
|
|
return False;
|
|
}
|
|
|
|
nesting = data->nesting;
|
|
|
|
if (!nesting) {
|
|
data->has_error = True;
|
|
return False;
|
|
}
|
|
len = data->ofs - (nesting->start+1);
|
|
/* yes, this is ugly. We don't know in advance how many bytes the length
|
|
of a tag will take, so we assumed 1 byte. If we were wrong then we
|
|
need to correct our mistake */
|
|
if (len > 0xFFFF) {
|
|
data->data[nesting->start] = 0x83;
|
|
if (!asn1_write_uint8(data, 0)) return False;
|
|
if (!asn1_write_uint8(data, 0)) return False;
|
|
if (!asn1_write_uint8(data, 0)) return False;
|
|
memmove(data->data+nesting->start+4, data->data+nesting->start+1, len);
|
|
data->data[nesting->start+1] = (len>>16) & 0xFF;
|
|
data->data[nesting->start+2] = (len>>8) & 0xFF;
|
|
data->data[nesting->start+3] = len&0xff;
|
|
} else if (len > 255) {
|
|
data->data[nesting->start] = 0x82;
|
|
if (!asn1_write_uint8(data, 0)) return False;
|
|
if (!asn1_write_uint8(data, 0)) return False;
|
|
memmove(data->data+nesting->start+3, data->data+nesting->start+1, len);
|
|
data->data[nesting->start+1] = len>>8;
|
|
data->data[nesting->start+2] = len&0xff;
|
|
} else if (len > 127) {
|
|
data->data[nesting->start] = 0x81;
|
|
if (!asn1_write_uint8(data, 0)) return False;
|
|
memmove(data->data+nesting->start+2, data->data+nesting->start+1, len);
|
|
data->data[nesting->start+1] = len;
|
|
} else {
|
|
data->data[nesting->start] = len;
|
|
}
|
|
|
|
data->nesting = nesting->next;
|
|
free(nesting);
|
|
return True;
|
|
}
|
|
|
|
|
|
/* write an integer */
|
|
BOOL asn1_write_Integer(ASN1_DATA *data, int i)
|
|
{
|
|
if (!asn1_push_tag(data, ASN1_INTEGER)) return False;
|
|
do {
|
|
asn1_write_uint8(data, i);
|
|
i = i >> 8;
|
|
} while (i);
|
|
return asn1_pop_tag(data);
|
|
}
|
|
|
|
/* write an object ID to a ASN1 buffer */
|
|
BOOL asn1_write_OID(ASN1_DATA *data, const char *OID)
|
|
{
|
|
unsigned v, v2;
|
|
const char *p = (const char *)OID;
|
|
char *newp;
|
|
|
|
if (!asn1_push_tag(data, ASN1_OID))
|
|
return False;
|
|
v = strtol(p, &newp, 10);
|
|
p = newp;
|
|
v2 = strtol(p, &newp, 10);
|
|
p = newp;
|
|
if (!asn1_write_uint8(data, 40*v + v2))
|
|
return False;
|
|
|
|
while (*p) {
|
|
v = strtol(p, &newp, 10);
|
|
p = newp;
|
|
if (v >= (1<<28)) asn1_write_uint8(data, 0x80 | ((v>>28)&0xff));
|
|
if (v >= (1<<21)) asn1_write_uint8(data, 0x80 | ((v>>21)&0xff));
|
|
if (v >= (1<<14)) asn1_write_uint8(data, 0x80 | ((v>>14)&0xff));
|
|
if (v >= (1<<7)) asn1_write_uint8(data, 0x80 | ((v>>7)&0xff));
|
|
if (!asn1_write_uint8(data, v&0x7f))
|
|
return False;
|
|
}
|
|
return asn1_pop_tag(data);
|
|
}
|
|
|
|
/* write an octet string */
|
|
BOOL asn1_write_OctetString(ASN1_DATA *data, const void *p, size_t length)
|
|
{
|
|
asn1_push_tag(data, ASN1_OCTET_STRING);
|
|
asn1_write(data, p, length);
|
|
asn1_pop_tag(data);
|
|
return !data->has_error;
|
|
}
|
|
|
|
/* write a general string */
|
|
BOOL asn1_write_GeneralString(ASN1_DATA *data, const char *s)
|
|
{
|
|
asn1_push_tag(data, ASN1_GENERAL_STRING);
|
|
asn1_write(data, s, strlen(s));
|
|
asn1_pop_tag(data);
|
|
return !data->has_error;
|
|
}
|
|
|
|
/* write a BOOLEAN */
|
|
BOOL asn1_write_BOOLEAN(ASN1_DATA *data, BOOL v)
|
|
{
|
|
asn1_write_uint8(data, ASN1_BOOLEAN);
|
|
asn1_write_uint8(data, v);
|
|
return !data->has_error;
|
|
}
|
|
|
|
/* write a BOOLEAN - hmm, I suspect this one is the correct one, and the
|
|
above boolean is bogus. Need to check */
|
|
BOOL asn1_write_BOOLEAN2(ASN1_DATA *data, BOOL v)
|
|
{
|
|
asn1_push_tag(data, ASN1_BOOLEAN);
|
|
asn1_write_uint8(data, v);
|
|
asn1_pop_tag(data);
|
|
return !data->has_error;
|
|
}
|
|
|
|
/* check a BOOLEAN */
|
|
BOOL asn1_check_BOOLEAN(ASN1_DATA *data, BOOL v)
|
|
{
|
|
uint8 b = 0;
|
|
|
|
asn1_read_uint8(data, &b);
|
|
if (b != ASN1_BOOLEAN) {
|
|
data->has_error = True;
|
|
return False;
|
|
}
|
|
asn1_read_uint8(data, &b);
|
|
if (b != v) {
|
|
data->has_error = True;
|
|
return False;
|
|
}
|
|
return !data->has_error;
|
|
}
|
|
|
|
|
|
/* load a ASN1_DATA structure with a lump of data, ready to be parsed */
|
|
BOOL asn1_load(ASN1_DATA *data, DATA_BLOB blob)
|
|
{
|
|
ZERO_STRUCTP(data);
|
|
data->data = (unsigned char *)memdup(blob.data, blob.length);
|
|
if (!data->data) {
|
|
data->has_error = True;
|
|
return False;
|
|
}
|
|
data->length = blob.length;
|
|
return True;
|
|
}
|
|
|
|
/* read from a ASN1 buffer, advancing the buffer pointer */
|
|
BOOL asn1_read(ASN1_DATA *data, void *p, int len)
|
|
{
|
|
if (data->has_error)
|
|
return False;
|
|
|
|
if (len < 0 || data->ofs + len < data->ofs || data->ofs + len < len) {
|
|
data->has_error = True;
|
|
return False;
|
|
}
|
|
|
|
if (data->ofs + len > data->length) {
|
|
data->has_error = True;
|
|
return False;
|
|
}
|
|
memcpy(p, data->data + data->ofs, len);
|
|
data->ofs += len;
|
|
return True;
|
|
}
|
|
|
|
/* read a uint8 from a ASN1 buffer */
|
|
BOOL asn1_read_uint8(ASN1_DATA *data, uint8 *v)
|
|
{
|
|
return asn1_read(data, v, 1);
|
|
}
|
|
|
|
/* start reading a nested asn1 structure */
|
|
BOOL asn1_start_tag(ASN1_DATA *data, uint8 tag)
|
|
{
|
|
uint8 b;
|
|
struct nesting *nesting;
|
|
|
|
if (!asn1_read_uint8(data, &b))
|
|
return False;
|
|
|
|
if (b != tag) {
|
|
data->has_error = True;
|
|
return False;
|
|
}
|
|
nesting = SMB_MALLOC_P(struct nesting);
|
|
if (!nesting) {
|
|
data->has_error = True;
|
|
return False;
|
|
}
|
|
|
|
if (!asn1_read_uint8(data, &b)) {
|
|
SAFE_FREE(nesting);
|
|
return False;
|
|
}
|
|
|
|
if (b & 0x80) {
|
|
int n = b & 0x7f;
|
|
if (!asn1_read_uint8(data, &b)) {
|
|
SAFE_FREE(nesting);
|
|
return False;
|
|
}
|
|
nesting->taglen = b;
|
|
while (n > 1) {
|
|
if (!asn1_read_uint8(data, &b)) {
|
|
SAFE_FREE(nesting);
|
|
return False;
|
|
}
|
|
nesting->taglen = (nesting->taglen << 8) | b;
|
|
n--;
|
|
}
|
|
} else {
|
|
nesting->taglen = b;
|
|
}
|
|
nesting->start = data->ofs;
|
|
nesting->next = data->nesting;
|
|
data->nesting = nesting;
|
|
return !data->has_error;
|
|
}
|
|
|
|
|
|
/* stop reading a tag */
|
|
BOOL asn1_end_tag(ASN1_DATA *data)
|
|
{
|
|
struct nesting *nesting;
|
|
|
|
/* make sure we read it all */
|
|
if (asn1_tag_remaining(data) != 0) {
|
|
data->has_error = True;
|
|
return False;
|
|
}
|
|
|
|
nesting = data->nesting;
|
|
|
|
if (!nesting) {
|
|
data->has_error = True;
|
|
return False;
|
|
}
|
|
|
|
data->nesting = nesting->next;
|
|
free(nesting);
|
|
return True;
|
|
}
|
|
|
|
/* work out how many bytes are left in this nested tag */
|
|
int asn1_tag_remaining(ASN1_DATA *data)
|
|
{
|
|
if (data->has_error)
|
|
return 0;
|
|
|
|
if (!data->nesting) {
|
|
data->has_error = True;
|
|
return -1;
|
|
}
|
|
return data->nesting->taglen - (data->ofs - data->nesting->start);
|
|
}
|
|
|
|
/* read an object ID from a ASN1 buffer */
|
|
BOOL asn1_read_OID(ASN1_DATA *data, char **OID)
|
|
{
|
|
uint8 b;
|
|
pstring oid_str;
|
|
fstring el;
|
|
|
|
*OID = NULL;
|
|
|
|
if (!asn1_start_tag(data, ASN1_OID)) {
|
|
return False;
|
|
}
|
|
asn1_read_uint8(data, &b);
|
|
|
|
oid_str[0] = 0;
|
|
fstr_sprintf(el, "%u", b/40);
|
|
pstrcat(oid_str, el);
|
|
fstr_sprintf(el, " %u", b%40);
|
|
pstrcat(oid_str, el);
|
|
|
|
while (asn1_tag_remaining(data) > 0) {
|
|
unsigned v = 0;
|
|
do {
|
|
asn1_read_uint8(data, &b);
|
|
v = (v<<7) | (b&0x7f);
|
|
} while (!data->has_error && b & 0x80);
|
|
fstr_sprintf(el, " %u", v);
|
|
pstrcat(oid_str, el);
|
|
}
|
|
|
|
asn1_end_tag(data);
|
|
|
|
if (!data->has_error) {
|
|
*OID = SMB_STRDUP(oid_str);
|
|
}
|
|
|
|
return !data->has_error;
|
|
}
|
|
|
|
/* check that the next object ID is correct */
|
|
BOOL asn1_check_OID(ASN1_DATA *data, const char *OID)
|
|
{
|
|
char *id;
|
|
|
|
if (!asn1_read_OID(data, &id)) {
|
|
return False;
|
|
}
|
|
|
|
if (strcmp(id, OID) != 0) {
|
|
data->has_error = True;
|
|
return False;
|
|
}
|
|
free(id);
|
|
return True;
|
|
}
|
|
|
|
/* read a GeneralString from a ASN1 buffer */
|
|
BOOL asn1_read_GeneralString(ASN1_DATA *data, char **s)
|
|
{
|
|
int len;
|
|
char *str;
|
|
|
|
*s = NULL;
|
|
|
|
if (!asn1_start_tag(data, ASN1_GENERAL_STRING)) {
|
|
return False;
|
|
}
|
|
len = asn1_tag_remaining(data);
|
|
if (len < 0) {
|
|
data->has_error = True;
|
|
return False;
|
|
}
|
|
str = SMB_MALLOC_ARRAY(char, len+1);
|
|
if (!str) {
|
|
data->has_error = True;
|
|
return False;
|
|
}
|
|
asn1_read(data, str, len);
|
|
str[len] = 0;
|
|
asn1_end_tag(data);
|
|
|
|
if (!data->has_error) {
|
|
*s = str;
|
|
}
|
|
return !data->has_error;
|
|
}
|
|
|
|
/* read a octet string blob */
|
|
BOOL asn1_read_OctetString(ASN1_DATA *data, DATA_BLOB *blob)
|
|
{
|
|
int len;
|
|
ZERO_STRUCTP(blob);
|
|
if (!asn1_start_tag(data, ASN1_OCTET_STRING)) return False;
|
|
len = asn1_tag_remaining(data);
|
|
if (len < 0) {
|
|
data->has_error = True;
|
|
return False;
|
|
}
|
|
*blob = data_blob(NULL, len);
|
|
asn1_read(data, blob->data, len);
|
|
asn1_end_tag(data);
|
|
return !data->has_error;
|
|
}
|
|
|
|
/* read an interger */
|
|
BOOL asn1_read_Integer(ASN1_DATA *data, int *i)
|
|
{
|
|
uint8 b;
|
|
*i = 0;
|
|
|
|
if (!asn1_start_tag(data, ASN1_INTEGER)) return False;
|
|
while (asn1_tag_remaining(data)>0) {
|
|
asn1_read_uint8(data, &b);
|
|
*i = (*i << 8) + b;
|
|
}
|
|
return asn1_end_tag(data);
|
|
|
|
}
|
|
|
|
/* check a enumarted value is correct */
|
|
BOOL asn1_check_enumerated(ASN1_DATA *data, int v)
|
|
{
|
|
uint8 b;
|
|
if (!asn1_start_tag(data, ASN1_ENUMERATED)) return False;
|
|
asn1_read_uint8(data, &b);
|
|
asn1_end_tag(data);
|
|
|
|
if (v != b)
|
|
data->has_error = False;
|
|
|
|
return !data->has_error;
|
|
}
|
|
|
|
/* write an enumarted value to the stream */
|
|
BOOL asn1_write_enumerated(ASN1_DATA *data, uint8 v)
|
|
{
|
|
if (!asn1_push_tag(data, ASN1_ENUMERATED)) return False;
|
|
asn1_write_uint8(data, v);
|
|
asn1_pop_tag(data);
|
|
return !data->has_error;
|
|
}
|