433 lines
10 KiB
C
433 lines
10 KiB
C
/*
|
|
* Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
|
|
* (Royal Institute of Technology, Stockholm, Sweden).
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "krb5_locl.h"
|
|
|
|
RCSID("$Id: transited.c,v 1.10 2003/04/16 16:11:27 lha Exp $");
|
|
|
|
/* this is an attempt at one of the most horrible `compression'
|
|
schemes that has ever been invented; it's so amazingly brain-dead
|
|
that words can not describe it, and all this just to save a few
|
|
silly bytes */
|
|
|
|
struct tr_realm {
|
|
char *realm;
|
|
unsigned leading_space:1;
|
|
unsigned leading_slash:1;
|
|
unsigned trailing_dot:1;
|
|
struct tr_realm *next;
|
|
};
|
|
|
|
static void
|
|
free_realms(struct tr_realm *r)
|
|
{
|
|
struct tr_realm *p;
|
|
while(r){
|
|
p = r;
|
|
r = r->next;
|
|
free(p->realm);
|
|
free(p);
|
|
}
|
|
}
|
|
|
|
static int
|
|
make_path(krb5_context context, struct tr_realm *r,
|
|
const char *from, const char *to)
|
|
{
|
|
const char *p;
|
|
struct tr_realm *path = r->next;
|
|
struct tr_realm *tmp;
|
|
|
|
if(strlen(from) < strlen(to)){
|
|
const char *tmp;
|
|
tmp = from;
|
|
from = to;
|
|
to = tmp;
|
|
}
|
|
|
|
if(strcmp(from + strlen(from) - strlen(to), to) == 0){
|
|
p = from;
|
|
while(1){
|
|
p = strchr(p, '.');
|
|
if(p == NULL) {
|
|
krb5_clear_error_string (context);
|
|
return KRB5KDC_ERR_POLICY;
|
|
}
|
|
p++;
|
|
if(strcmp(p, to) == 0)
|
|
break;
|
|
tmp = calloc(1, sizeof(*tmp));
|
|
tmp->next = path;
|
|
path = tmp;
|
|
path->realm = strdup(p);
|
|
if(path->realm == NULL){
|
|
r->next = path; /* XXX */
|
|
krb5_set_error_string (context, "malloc: out of memory");
|
|
return ENOMEM;;
|
|
}
|
|
}
|
|
}else if(strncmp(from, to, strlen(to)) == 0){
|
|
p = from + strlen(from);
|
|
while(1){
|
|
while(p >= from && *p != '/') p--;
|
|
if(p == from)
|
|
return KRB5KDC_ERR_POLICY;
|
|
if(strncmp(to, from, p - from) == 0)
|
|
break;
|
|
tmp = calloc(1, sizeof(*tmp));
|
|
tmp->next = path;
|
|
path = tmp;
|
|
path->realm = malloc(p - from + 1);
|
|
if(path->realm == NULL){
|
|
r->next = path; /* XXX */
|
|
krb5_set_error_string (context, "malloc: out of memory");
|
|
return ENOMEM;
|
|
}
|
|
memcpy(path->realm, from, p - from);
|
|
path->realm[p - from] = '\0';
|
|
p--;
|
|
}
|
|
} else {
|
|
krb5_clear_error_string (context);
|
|
return KRB5KDC_ERR_POLICY;
|
|
}
|
|
r->next = path;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
make_paths(krb5_context context,
|
|
struct tr_realm *realms, const char *client_realm,
|
|
const char *server_realm)
|
|
{
|
|
struct tr_realm *r;
|
|
int ret;
|
|
const char *prev_realm = client_realm;
|
|
const char *next_realm = NULL;
|
|
for(r = realms; r; r = r->next){
|
|
/* it *might* be that you can have more than one empty
|
|
component in a row, at least that's how I interpret the
|
|
"," exception in 1510 */
|
|
if(r->realm[0] == '\0'){
|
|
while(r->next && r->next->realm[0] == '\0')
|
|
r = r->next;
|
|
if(r->next)
|
|
next_realm = r->next->realm;
|
|
else
|
|
next_realm = server_realm;
|
|
ret = make_path(context, r, prev_realm, next_realm);
|
|
if(ret){
|
|
free_realms(realms);
|
|
return ret;
|
|
}
|
|
}
|
|
prev_realm = r->realm;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
expand_realms(krb5_context context,
|
|
struct tr_realm *realms, const char *client_realm)
|
|
{
|
|
struct tr_realm *r;
|
|
const char *prev_realm = NULL;
|
|
for(r = realms; r; r = r->next){
|
|
if(r->trailing_dot){
|
|
char *tmp;
|
|
size_t len = strlen(r->realm) + strlen(prev_realm) + 1;
|
|
|
|
if(prev_realm == NULL)
|
|
prev_realm = client_realm;
|
|
tmp = realloc(r->realm, len);
|
|
if(tmp == NULL){
|
|
free_realms(realms);
|
|
krb5_set_error_string (context, "malloc: out of memory");
|
|
return ENOMEM;
|
|
}
|
|
r->realm = tmp;
|
|
strlcat(r->realm, prev_realm, len);
|
|
}else if(r->leading_slash && !r->leading_space && prev_realm){
|
|
/* yet another exception: if you use x500-names, the
|
|
leading realm doesn't have to be "quoted" with a space */
|
|
char *tmp;
|
|
size_t len = strlen(r->realm) + strlen(prev_realm) + 1;
|
|
|
|
tmp = malloc(len);
|
|
if(tmp == NULL){
|
|
free_realms(realms);
|
|
krb5_set_error_string (context, "malloc: out of memory");
|
|
return ENOMEM;
|
|
}
|
|
strlcpy(tmp, prev_realm, len);
|
|
strlcat(tmp, r->realm, len);
|
|
free(r->realm);
|
|
r->realm = tmp;
|
|
}
|
|
prev_realm = r->realm;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct tr_realm *
|
|
make_realm(char *realm)
|
|
{
|
|
struct tr_realm *r;
|
|
char *p, *q;
|
|
int quote = 0;
|
|
r = calloc(1, sizeof(*r));
|
|
if(r == NULL){
|
|
free(realm);
|
|
return NULL;
|
|
}
|
|
r->realm = realm;
|
|
for(p = q = r->realm; *p; p++){
|
|
if(p == r->realm && *p == ' '){
|
|
r->leading_space = 1;
|
|
continue;
|
|
}
|
|
if(q == r->realm && *p == '/')
|
|
r->leading_slash = 1;
|
|
if(quote){
|
|
*q++ = *p;
|
|
quote = 0;
|
|
continue;
|
|
}
|
|
if(*p == '\\'){
|
|
quote = 1;
|
|
continue;
|
|
}
|
|
if(p[0] == '.' && p[1] == '\0')
|
|
r->trailing_dot = 1;
|
|
*q++ = *p;
|
|
}
|
|
*q = '\0';
|
|
return r;
|
|
}
|
|
|
|
static struct tr_realm*
|
|
append_realm(struct tr_realm *head, struct tr_realm *r)
|
|
{
|
|
struct tr_realm *p;
|
|
if(head == NULL){
|
|
r->next = NULL;
|
|
return r;
|
|
}
|
|
p = head;
|
|
while(p->next) p = p->next;
|
|
p->next = r;
|
|
return head;
|
|
}
|
|
|
|
static int
|
|
decode_realms(krb5_context context,
|
|
const char *tr, int length, struct tr_realm **realms)
|
|
{
|
|
struct tr_realm *r = NULL;
|
|
|
|
char *tmp;
|
|
int quote = 0;
|
|
const char *start = tr;
|
|
int i;
|
|
|
|
for(i = 0; i < length; i++){
|
|
if(quote){
|
|
quote = 0;
|
|
continue;
|
|
}
|
|
if(tr[i] == '\\'){
|
|
quote = 1;
|
|
continue;
|
|
}
|
|
if(tr[i] == ','){
|
|
tmp = malloc(tr + i - start + 1);
|
|
memcpy(tmp, start, tr + i - start);
|
|
tmp[tr + i - start] = '\0';
|
|
r = make_realm(tmp);
|
|
if(r == NULL){
|
|
free_realms(*realms);
|
|
krb5_set_error_string (context, "malloc: out of memory");
|
|
return ENOMEM;
|
|
}
|
|
*realms = append_realm(*realms, r);
|
|
start = tr + i + 1;
|
|
}
|
|
}
|
|
tmp = malloc(tr + i - start + 1);
|
|
memcpy(tmp, start, tr + i - start);
|
|
tmp[tr + i - start] = '\0';
|
|
r = make_realm(tmp);
|
|
if(r == NULL){
|
|
free_realms(*realms);
|
|
krb5_set_error_string (context, "malloc: out of memory");
|
|
return ENOMEM;
|
|
}
|
|
*realms = append_realm(*realms, r);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
krb5_error_code
|
|
krb5_domain_x500_decode(krb5_context context,
|
|
krb5_data tr, char ***realms, int *num_realms,
|
|
const char *client_realm, const char *server_realm)
|
|
{
|
|
struct tr_realm *r = NULL;
|
|
struct tr_realm *p, **q;
|
|
int ret;
|
|
|
|
/* split string in components */
|
|
ret = decode_realms(context, tr.data, tr.length, &r);
|
|
if(ret)
|
|
return ret;
|
|
|
|
/* apply prefix rule */
|
|
ret = expand_realms(context, r, client_realm);
|
|
if(ret)
|
|
return ret;
|
|
|
|
ret = make_paths(context, r, client_realm, server_realm);
|
|
if(ret)
|
|
return ret;
|
|
|
|
/* remove empty components and count realms */
|
|
q = &r;
|
|
*num_realms = 0;
|
|
for(p = r; p; ){
|
|
if(p->realm[0] == '\0'){
|
|
free(p->realm);
|
|
*q = p->next;
|
|
free(p);
|
|
p = *q;
|
|
}else{
|
|
q = &p->next;
|
|
p = p->next;
|
|
(*num_realms)++;
|
|
}
|
|
}
|
|
if (*num_realms < 0 || *num_realms + 1 > UINT_MAX/sizeof(**realms))
|
|
return ERANGE;
|
|
|
|
{
|
|
char **R;
|
|
R = malloc((*num_realms + 1) * sizeof(*R));
|
|
if (R == NULL)
|
|
return ENOMEM;
|
|
*realms = R;
|
|
while(r){
|
|
*R++ = r->realm;
|
|
p = r->next;
|
|
free(r);
|
|
r = p;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_domain_x500_encode(char **realms, int num_realms, krb5_data *encoding)
|
|
{
|
|
char *s = NULL;
|
|
int len = 0;
|
|
int i;
|
|
for(i = 0; i < num_realms; i++){
|
|
len += strlen(realms[i]);
|
|
if(realms[i][0] == '/')
|
|
len++;
|
|
}
|
|
len += num_realms - 1;
|
|
s = malloc(len + 1);
|
|
*s = '\0';
|
|
for(i = 0; i < num_realms; i++){
|
|
if(i && i < num_realms - 1)
|
|
strlcat(s, ",", len + 1);
|
|
if(realms[i][0] == '/')
|
|
strlcat(s, " ", len + 1);
|
|
strlcat(s, realms[i], len + 1);
|
|
}
|
|
encoding->data = s;
|
|
encoding->length = strlen(s);
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
krb5_check_transited_realms(krb5_context context,
|
|
const char *const *realms,
|
|
int num_realms,
|
|
int *bad_realm)
|
|
{
|
|
int i;
|
|
int ret = 0;
|
|
char **bad_realms = krb5_config_get_strings(context, NULL,
|
|
"libdefaults",
|
|
"transited_realms_reject",
|
|
NULL);
|
|
if(bad_realms == NULL)
|
|
return 0;
|
|
|
|
for(i = 0; i < num_realms; i++) {
|
|
char **p;
|
|
for(p = bad_realms; *p; p++)
|
|
if(strcmp(*p, realms[i]) == 0) {
|
|
krb5_set_error_string (context, "no transit through realm %s",
|
|
*p);
|
|
ret = KRB5KRB_AP_ERR_ILL_CR_TKT;
|
|
if(bad_realm)
|
|
*bad_realm = i;
|
|
break;
|
|
}
|
|
}
|
|
krb5_config_free_strings(bad_realms);
|
|
return ret;
|
|
}
|
|
|
|
#if 0
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
krb5_data x;
|
|
char **r;
|
|
int num, i;
|
|
x.data = argv[1];
|
|
x.length = strlen(x.data);
|
|
if(domain_expand(x, &r, &num, argv[2], argv[3]))
|
|
exit(1);
|
|
for(i = 0; i < num; i++)
|
|
printf("%s\n", r[i]);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|