5447b81fb1
This is a large commit that adds several features: - Revamps and moves virtual host-based service principal functionality from kdc/ to lib/hdb/ so that it may be automatically visible to lib/kadm5/, as well as kadmin(1)/kadmind(8) and ktutil(1). The changes are backwards-incompatible. - Completes support for documenting a service principal's supported enctypes in its HDB entry independently of its long-term keys. This will reduce HDB bloat by not requiring that service principals have more long-term keys than they need just to document the service's supported enctypes. - Adds support for storing krb5.conf content in principals' HDB entries. This may eventually be used for causing Heimdal KDC services to reconfigure primary/secondary roles automatically by discovering the configured primary in an HDB entry for the realm. For now this will be used to help reduce the amount of configuration needed by clients of an upcoming HTTP binding of the kadmin service.
243 lines
6.5 KiB
C
243 lines
6.5 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 "kadm5_locl.h"
|
|
|
|
RCSID("$Id$");
|
|
|
|
static struct units acl_units[] = {
|
|
{ "all", KADM5_PRIV_ALL },
|
|
{ "change-password",KADM5_PRIV_CPW },
|
|
{ "cpw", KADM5_PRIV_CPW },
|
|
{ "list", KADM5_PRIV_LIST },
|
|
{ "delete", KADM5_PRIV_DELETE },
|
|
{ "modify", KADM5_PRIV_MODIFY },
|
|
{ "add", KADM5_PRIV_ADD },
|
|
{ "get", KADM5_PRIV_GET },
|
|
{ "get-keys", KADM5_PRIV_GET_KEYS },
|
|
{ NULL, 0 }
|
|
};
|
|
|
|
kadm5_ret_t
|
|
_kadm5_string_to_privs(const char *s, uint32_t* privs)
|
|
{
|
|
int flags;
|
|
flags = parse_flags(s, acl_units, 0);
|
|
if(flags < 0)
|
|
return KADM5_FAILURE;
|
|
*privs = flags;
|
|
return 0;
|
|
}
|
|
|
|
kadm5_ret_t
|
|
_kadm5_privs_to_string(uint32_t privs, char *string, size_t len)
|
|
{
|
|
if(privs == 0)
|
|
strlcpy(string, "none", len);
|
|
else
|
|
unparse_flags(privs, acl_units + 1, string, len);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* retrieve the right for the current caller on `princ' (NULL means all)
|
|
* and store them in `ret_flags'
|
|
* return 0 or an error.
|
|
*/
|
|
|
|
static kadm5_ret_t
|
|
fetch_acl (kadm5_server_context *context,
|
|
krb5_const_principal princ,
|
|
unsigned *ret_flags)
|
|
{
|
|
FILE *f;
|
|
krb5_error_code ret = 0;
|
|
char buf[256];
|
|
|
|
*ret_flags = 0;
|
|
|
|
/* no acl file -> no rights */
|
|
f = fopen(context->config.acl_file, "r");
|
|
if (f == NULL)
|
|
return 0;
|
|
|
|
while(fgets(buf, sizeof(buf), f) != NULL) {
|
|
char *foo = NULL, *p;
|
|
krb5_principal this_princ;
|
|
unsigned flags = 0;
|
|
|
|
p = strtok_r(buf, " \t\n", &foo);
|
|
if(p == NULL)
|
|
continue;
|
|
if (*p == '#') /* comment */
|
|
continue;
|
|
ret = krb5_parse_name(context->context, p, &this_princ);
|
|
if(ret)
|
|
break;
|
|
if(!krb5_principal_compare(context->context,
|
|
context->caller, this_princ)) {
|
|
krb5_free_principal(context->context, this_princ);
|
|
continue;
|
|
}
|
|
krb5_free_principal(context->context, this_princ);
|
|
p = strtok_r(NULL, " \t\n", &foo);
|
|
if(p == NULL)
|
|
continue;
|
|
ret = _kadm5_string_to_privs(p, &flags);
|
|
if (ret)
|
|
break;
|
|
p = strtok_r(NULL, " \t\n", &foo);
|
|
if (p == NULL) {
|
|
*ret_flags = flags;
|
|
break;
|
|
}
|
|
if (princ != NULL) {
|
|
krb5_principal pattern_princ;
|
|
krb5_boolean match;
|
|
const char *c0 = krb5_principal_get_comp_string(context->context,
|
|
princ, 0);
|
|
const char *pat_c0;
|
|
|
|
ret = krb5_parse_name(context->context, p, &pattern_princ);
|
|
if (ret)
|
|
break;
|
|
pat_c0 = krb5_principal_get_comp_string(context->context,
|
|
pattern_princ, 0);
|
|
match = krb5_principal_match(context->context,
|
|
princ, pattern_princ);
|
|
|
|
/*
|
|
* If `princ' is a WELLKNOWN name, then require the WELLKNOWN label
|
|
* be matched exactly.
|
|
*
|
|
* FIXME: We could do something similar for krbtgt and kadmin other
|
|
* principal types.
|
|
*/
|
|
if (match && c0 && strcmp(c0, "WELLKNOWN") == 0 &&
|
|
(!pat_c0 || strcmp(pat_c0, "WELLKNOWN") != 0))
|
|
match = FALSE;
|
|
krb5_free_principal(context->context, pattern_princ);
|
|
if (match) {
|
|
*ret_flags = flags;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
fclose(f);
|
|
return ret;
|
|
}
|
|
|
|
krb5_boolean
|
|
_kadm5_is_kadmin_service_p(kadm5_server_context *context)
|
|
{
|
|
krb5_boolean ret;
|
|
krb5_principal princ;
|
|
|
|
if (krb5_parse_name(context->context, KADM5_ADMIN_SERVICE, &princ) != 0)
|
|
return FALSE;
|
|
|
|
ret = krb5_principal_compare(context->context, context->caller, princ);
|
|
krb5_free_principal(context->context, princ);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* set global acl flags in `context' for the current caller.
|
|
* return 0 on success or an error
|
|
*/
|
|
|
|
kadm5_ret_t
|
|
_kadm5_acl_init(kadm5_server_context *context)
|
|
{
|
|
if (_kadm5_is_kadmin_service_p(context)) {
|
|
context->acl_flags = KADM5_PRIV_ALL;
|
|
return 0;
|
|
}
|
|
|
|
return fetch_acl (context, NULL, &context->acl_flags);
|
|
}
|
|
|
|
/*
|
|
* check if `flags' allows `op'
|
|
* return 0 if OK or an error
|
|
*/
|
|
|
|
static kadm5_ret_t
|
|
check_flags (unsigned op,
|
|
unsigned flags)
|
|
{
|
|
unsigned res = ~flags & op;
|
|
|
|
if(res & KADM5_PRIV_GET)
|
|
return KADM5_AUTH_GET;
|
|
if(res & KADM5_PRIV_GET_KEYS)
|
|
return KADM5_AUTH_GET_KEYS;
|
|
if(res & KADM5_PRIV_ADD)
|
|
return KADM5_AUTH_ADD;
|
|
if(res & KADM5_PRIV_MODIFY)
|
|
return KADM5_AUTH_MODIFY;
|
|
if(res & KADM5_PRIV_DELETE)
|
|
return KADM5_AUTH_DELETE;
|
|
if(res & KADM5_PRIV_CPW)
|
|
return KADM5_AUTH_CHANGEPW;
|
|
if(res & KADM5_PRIV_LIST)
|
|
return KADM5_AUTH_LIST;
|
|
if(res)
|
|
return KADM5_AUTH_INSUFFICIENT;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* return 0 if the current caller in `context' is allowed to perform
|
|
* `op' on `princ' and otherwise an error
|
|
* princ == NULL if it's not relevant.
|
|
*/
|
|
|
|
kadm5_ret_t
|
|
_kadm5_acl_check_permission(kadm5_server_context *context,
|
|
unsigned op,
|
|
krb5_const_principal princ)
|
|
{
|
|
kadm5_ret_t ret;
|
|
unsigned princ_flags;
|
|
|
|
ret = check_flags (op, context->acl_flags);
|
|
if (ret == 0)
|
|
return ret;
|
|
ret = fetch_acl (context, princ, &princ_flags);
|
|
if (ret)
|
|
return ret;
|
|
return check_flags (op, princ_flags);
|
|
}
|