578 lines
16 KiB
C
578 lines
16 KiB
C
/*
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* Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "kadmin_locl.h"
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#include <krb5-private.h>
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RCSID("$Id: server.c 17611 2006-06-02 22:10:21Z lha $");
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static kadm5_ret_t
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kadmind_dispatch(void *kadm_handle, krb5_boolean initial,
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krb5_data *in, krb5_data *out)
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{
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kadm5_ret_t ret;
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int32_t cmd, mask, tmp;
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kadm5_server_context *context = kadm_handle;
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char client[128], name[128], name2[128];
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char *op = "";
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krb5_principal princ, princ2;
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kadm5_principal_ent_rec ent;
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char *password, *expression;
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krb5_keyblock *new_keys;
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int n_keys;
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char **princs;
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int n_princs;
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krb5_storage *sp;
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krb5_unparse_name_fixed(context->context, context->caller,
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client, sizeof(client));
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sp = krb5_storage_from_data(in);
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krb5_ret_int32(sp, &cmd);
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switch(cmd){
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case kadm_get:{
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op = "GET";
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ret = krb5_ret_principal(sp, &princ);
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if(ret)
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goto fail;
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ret = krb5_ret_int32(sp, &mask);
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if(ret){
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krb5_free_principal(context->context, princ);
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goto fail;
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}
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krb5_unparse_name_fixed(context->context, princ, name, sizeof(name));
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krb5_warnx(context->context, "%s: %s %s", client, op, name);
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ret = _kadm5_acl_check_permission(context, KADM5_PRIV_GET, princ);
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if(ret){
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krb5_free_principal(context->context, princ);
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goto fail;
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}
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ret = kadm5_get_principal(kadm_handle, princ, &ent, mask);
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krb5_storage_free(sp);
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sp = krb5_storage_emem();
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krb5_store_int32(sp, ret);
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if(ret == 0){
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kadm5_store_principal_ent(sp, &ent);
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kadm5_free_principal_ent(kadm_handle, &ent);
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}
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krb5_free_principal(context->context, princ);
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break;
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}
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case kadm_delete:{
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op = "DELETE";
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ret = krb5_ret_principal(sp, &princ);
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if(ret)
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goto fail;
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krb5_unparse_name_fixed(context->context, princ, name, sizeof(name));
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krb5_warnx(context->context, "%s: %s %s", client, op, name);
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ret = _kadm5_acl_check_permission(context, KADM5_PRIV_DELETE, princ);
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if(ret){
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krb5_free_principal(context->context, princ);
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goto fail;
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}
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ret = kadm5_delete_principal(kadm_handle, princ);
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krb5_free_principal(context->context, princ);
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krb5_storage_free(sp);
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sp = krb5_storage_emem();
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krb5_store_int32(sp, ret);
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break;
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}
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case kadm_create:{
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op = "CREATE";
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ret = kadm5_ret_principal_ent(sp, &ent);
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if(ret)
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goto fail;
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ret = krb5_ret_int32(sp, &mask);
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if(ret){
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kadm5_free_principal_ent(context->context, &ent);
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goto fail;
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}
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ret = krb5_ret_string(sp, &password);
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if(ret){
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kadm5_free_principal_ent(context->context, &ent);
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goto fail;
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}
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krb5_unparse_name_fixed(context->context, ent.principal,
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name, sizeof(name));
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krb5_warnx(context->context, "%s: %s %s", client, op, name);
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ret = _kadm5_acl_check_permission(context, KADM5_PRIV_ADD,
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ent.principal);
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if(ret){
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kadm5_free_principal_ent(context->context, &ent);
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memset(password, 0, strlen(password));
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free(password);
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goto fail;
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}
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ret = kadm5_create_principal(kadm_handle, &ent,
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mask, password);
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kadm5_free_principal_ent(kadm_handle, &ent);
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memset(password, 0, strlen(password));
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free(password);
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krb5_storage_free(sp);
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sp = krb5_storage_emem();
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krb5_store_int32(sp, ret);
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break;
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}
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case kadm_modify:{
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op = "MODIFY";
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ret = kadm5_ret_principal_ent(sp, &ent);
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if(ret)
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goto fail;
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ret = krb5_ret_int32(sp, &mask);
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if(ret){
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kadm5_free_principal_ent(context, &ent);
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goto fail;
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}
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krb5_unparse_name_fixed(context->context, ent.principal,
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name, sizeof(name));
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krb5_warnx(context->context, "%s: %s %s", client, op, name);
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ret = _kadm5_acl_check_permission(context, KADM5_PRIV_MODIFY,
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ent.principal);
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if(ret){
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kadm5_free_principal_ent(context, &ent);
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goto fail;
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}
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ret = kadm5_modify_principal(kadm_handle, &ent, mask);
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kadm5_free_principal_ent(kadm_handle, &ent);
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krb5_storage_free(sp);
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sp = krb5_storage_emem();
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krb5_store_int32(sp, ret);
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break;
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}
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case kadm_rename:{
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op = "RENAME";
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ret = krb5_ret_principal(sp, &princ);
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if(ret)
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goto fail;
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ret = krb5_ret_principal(sp, &princ2);
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if(ret){
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krb5_free_principal(context->context, princ);
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goto fail;
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}
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krb5_unparse_name_fixed(context->context, princ, name, sizeof(name));
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krb5_unparse_name_fixed(context->context, princ2, name2, sizeof(name2));
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krb5_warnx(context->context, "%s: %s %s -> %s",
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client, op, name, name2);
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ret = _kadm5_acl_check_permission(context,
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KADM5_PRIV_ADD,
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princ2)
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|| _kadm5_acl_check_permission(context,
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KADM5_PRIV_DELETE,
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princ);
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if(ret){
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krb5_free_principal(context->context, princ);
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krb5_free_principal(context->context, princ2);
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goto fail;
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}
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ret = kadm5_rename_principal(kadm_handle, princ, princ2);
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krb5_free_principal(context->context, princ);
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krb5_free_principal(context->context, princ2);
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krb5_storage_free(sp);
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sp = krb5_storage_emem();
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krb5_store_int32(sp, ret);
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break;
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}
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case kadm_chpass:{
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op = "CHPASS";
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ret = krb5_ret_principal(sp, &princ);
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if(ret)
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goto fail;
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ret = krb5_ret_string(sp, &password);
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if(ret){
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krb5_free_principal(context->context, princ);
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goto fail;
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}
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krb5_unparse_name_fixed(context->context, princ, name, sizeof(name));
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krb5_warnx(context->context, "%s: %s %s", client, op, name);
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/*
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* The change is allowed if at least one of:
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* a) it's for the principal him/herself and this was an
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* initial ticket, but then, check with the password quality
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* function.
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* b) the user is on the CPW ACL.
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*/
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if (initial
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&& krb5_principal_compare (context->context, context->caller,
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princ))
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{
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krb5_data pwd_data;
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const char *pwd_reason;
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pwd_data.data = password;
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pwd_data.length = strlen(password);
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pwd_reason = kadm5_check_password_quality (context->context,
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princ, &pwd_data);
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if (pwd_reason != NULL)
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ret = KADM5_PASS_Q_DICT;
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else
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ret = 0;
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} else
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ret = _kadm5_acl_check_permission(context, KADM5_PRIV_CPW, princ);
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if(ret) {
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krb5_free_principal(context->context, princ);
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memset(password, 0, strlen(password));
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free(password);
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goto fail;
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}
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ret = kadm5_chpass_principal(kadm_handle, princ, password);
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krb5_free_principal(context->context, princ);
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memset(password, 0, strlen(password));
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free(password);
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krb5_storage_free(sp);
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sp = krb5_storage_emem();
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krb5_store_int32(sp, ret);
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break;
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}
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case kadm_chpass_with_key:{
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int i;
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krb5_key_data *key_data;
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int n_key_data;
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op = "CHPASS_WITH_KEY";
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ret = krb5_ret_principal(sp, &princ);
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if(ret)
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goto fail;
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ret = krb5_ret_int32(sp, &n_key_data);
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if (ret) {
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krb5_free_principal(context->context, princ);
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goto fail;
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}
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/* n_key_data will be squeezed into an int16_t below. */
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if (n_key_data < 0 || n_key_data >= 1 << 16 ||
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n_key_data > UINT_MAX/sizeof(*key_data)) {
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ret = ERANGE;
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krb5_free_principal(context->context, princ);
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goto fail;
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}
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key_data = malloc (n_key_data * sizeof(*key_data));
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if (key_data == NULL) {
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ret = ENOMEM;
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krb5_free_principal(context->context, princ);
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goto fail;
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}
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for (i = 0; i < n_key_data; ++i) {
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ret = kadm5_ret_key_data (sp, &key_data[i]);
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if (ret) {
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int16_t dummy = i;
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kadm5_free_key_data (context, &dummy, key_data);
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free (key_data);
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krb5_free_principal(context->context, princ);
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goto fail;
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}
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}
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krb5_unparse_name_fixed(context->context, princ, name, sizeof(name));
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krb5_warnx(context->context, "%s: %s %s", client, op, name);
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/*
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* The change is only allowed if the user is on the CPW ACL,
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* this it to force password quality check on the user.
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*/
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ret = _kadm5_acl_check_permission(context, KADM5_PRIV_CPW, princ);
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if(ret) {
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int16_t dummy = n_key_data;
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kadm5_free_key_data (context, &dummy, key_data);
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free (key_data);
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krb5_free_principal(context->context, princ);
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goto fail;
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}
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ret = kadm5_chpass_principal_with_key(kadm_handle, princ,
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n_key_data, key_data);
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{
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int16_t dummy = n_key_data;
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kadm5_free_key_data (context, &dummy, key_data);
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}
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free (key_data);
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krb5_free_principal(context->context, princ);
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krb5_storage_free(sp);
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sp = krb5_storage_emem();
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krb5_store_int32(sp, ret);
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break;
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}
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case kadm_randkey:{
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op = "RANDKEY";
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ret = krb5_ret_principal(sp, &princ);
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if(ret)
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goto fail;
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krb5_unparse_name_fixed(context->context, princ, name, sizeof(name));
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krb5_warnx(context->context, "%s: %s %s", client, op, name);
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/*
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* The change is allowed if at least one of:
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* a) it's for the principal him/herself and this was an initial ticket
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* b) the user is on the CPW ACL.
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*/
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if (initial
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&& krb5_principal_compare (context->context, context->caller,
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princ))
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ret = 0;
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else
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ret = _kadm5_acl_check_permission(context, KADM5_PRIV_CPW, princ);
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if(ret) {
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krb5_free_principal(context->context, princ);
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goto fail;
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}
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ret = kadm5_randkey_principal(kadm_handle, princ,
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&new_keys, &n_keys);
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krb5_free_principal(context->context, princ);
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krb5_storage_free(sp);
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sp = krb5_storage_emem();
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krb5_store_int32(sp, ret);
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if(ret == 0){
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int i;
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krb5_store_int32(sp, n_keys);
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for(i = 0; i < n_keys; i++){
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krb5_store_keyblock(sp, new_keys[i]);
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krb5_free_keyblock_contents(context->context, &new_keys[i]);
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}
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}
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break;
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}
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case kadm_get_privs:{
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uint32_t privs;
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ret = kadm5_get_privs(kadm_handle, &privs);
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krb5_storage_free(sp);
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sp = krb5_storage_emem();
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krb5_store_int32(sp, ret);
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if(ret == 0)
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krb5_store_uint32(sp, privs);
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break;
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}
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case kadm_get_princs:{
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op = "LIST";
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ret = krb5_ret_int32(sp, &tmp);
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if(ret)
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goto fail;
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if(tmp){
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ret = krb5_ret_string(sp, &expression);
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if(ret)
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goto fail;
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}else
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expression = NULL;
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krb5_warnx(context->context, "%s: %s %s", client, op,
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expression ? expression : "*");
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ret = _kadm5_acl_check_permission(context, KADM5_PRIV_LIST, NULL);
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if(ret){
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free(expression);
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goto fail;
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}
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ret = kadm5_get_principals(kadm_handle, expression, &princs, &n_princs);
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free(expression);
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krb5_storage_free(sp);
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sp = krb5_storage_emem();
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krb5_store_int32(sp, ret);
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if(ret == 0){
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int i;
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krb5_store_int32(sp, n_princs);
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for(i = 0; i < n_princs; i++)
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krb5_store_string(sp, princs[i]);
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kadm5_free_name_list(kadm_handle, princs, &n_princs);
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}
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break;
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}
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default:
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krb5_warnx(context->context, "%s: UNKNOWN OP %d", client, cmd);
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krb5_storage_free(sp);
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sp = krb5_storage_emem();
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krb5_store_int32(sp, KADM5_FAILURE);
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break;
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}
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krb5_storage_to_data(sp, out);
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krb5_storage_free(sp);
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return 0;
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fail:
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krb5_warn(context->context, ret, "%s", op);
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krb5_storage_seek(sp, 0, SEEK_SET);
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krb5_store_int32(sp, ret);
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krb5_storage_to_data(sp, out);
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krb5_storage_free(sp);
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return 0;
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}
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static void
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v5_loop (krb5_context context,
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krb5_auth_context ac,
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krb5_boolean initial,
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void *kadm_handle,
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int fd)
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{
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krb5_error_code ret;
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krb5_data in, out;
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for (;;) {
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doing_useful_work = 0;
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if(term_flag)
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exit(0);
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ret = krb5_read_priv_message(context, ac, &fd, &in);
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if(ret == HEIM_ERR_EOF)
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exit(0);
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if(ret)
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krb5_err(context, 1, ret, "krb5_read_priv_message");
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doing_useful_work = 1;
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kadmind_dispatch(kadm_handle, initial, &in, &out);
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krb5_data_free(&in);
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ret = krb5_write_priv_message(context, ac, &fd, &out);
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if(ret)
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krb5_err(context, 1, ret, "krb5_write_priv_message");
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}
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}
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static krb5_boolean
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match_appl_version(const void *data, const char *appl_version)
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{
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unsigned minor;
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if(sscanf(appl_version, "KADM0.%u", &minor) != 1)
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return 0;
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*(unsigned*)data = minor;
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return 1;
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}
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static void
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handle_v5(krb5_context context,
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krb5_auth_context ac,
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krb5_keytab keytab,
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int len,
|
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int fd)
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|
{
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|
krb5_error_code ret;
|
|
u_char version[sizeof(KRB5_SENDAUTH_VERSION)];
|
|
krb5_ticket *ticket;
|
|
char *server_name;
|
|
char *client;
|
|
void *kadm_handle;
|
|
ssize_t n;
|
|
krb5_boolean initial;
|
|
|
|
unsigned kadm_version;
|
|
kadm5_config_params realm_params;
|
|
|
|
if (len != sizeof(KRB5_SENDAUTH_VERSION))
|
|
krb5_errx(context, 1, "bad sendauth len %d", len);
|
|
n = krb5_net_read(context, &fd, version, len);
|
|
if (n < 0)
|
|
krb5_err (context, 1, errno, "reading sendauth version");
|
|
if (n == 0)
|
|
krb5_errx (context, 1, "EOF reading sendauth version");
|
|
if(memcmp(version, KRB5_SENDAUTH_VERSION, len) != 0)
|
|
krb5_errx(context, 1, "bad sendauth version %.8s", version);
|
|
|
|
ret = krb5_recvauth_match_version(context, &ac, &fd,
|
|
match_appl_version, &kadm_version,
|
|
NULL, KRB5_RECVAUTH_IGNORE_VERSION,
|
|
keytab, &ticket);
|
|
if(ret == KRB5_KT_NOTFOUND)
|
|
krb5_errx(context, 1, "krb5_recvauth: key not found");
|
|
if(ret)
|
|
krb5_err(context, 1, ret, "krb5_recvauth");
|
|
|
|
ret = krb5_unparse_name (context, ticket->server, &server_name);
|
|
if (ret)
|
|
krb5_err (context, 1, ret, "krb5_unparse_name");
|
|
|
|
if (strncmp (server_name, KADM5_ADMIN_SERVICE,
|
|
strlen(KADM5_ADMIN_SERVICE)) != 0)
|
|
krb5_errx (context, 1, "ticket for strange principal (%s)",
|
|
server_name);
|
|
|
|
free (server_name);
|
|
|
|
memset(&realm_params, 0, sizeof(realm_params));
|
|
|
|
if(kadm_version == 1) {
|
|
krb5_data params;
|
|
ret = krb5_read_priv_message(context, ac, &fd, ¶ms);
|
|
if(ret)
|
|
krb5_err(context, 1, ret, "krb5_read_priv_message");
|
|
_kadm5_unmarshal_params(context, ¶ms, &realm_params);
|
|
}
|
|
|
|
initial = ticket->ticket.flags.initial;
|
|
ret = krb5_unparse_name(context, ticket->client, &client);
|
|
if (ret)
|
|
krb5_err (context, 1, ret, "krb5_unparse_name");
|
|
krb5_free_ticket (context, ticket);
|
|
ret = kadm5_init_with_password_ctx(context,
|
|
client,
|
|
NULL,
|
|
KADM5_ADMIN_SERVICE,
|
|
&realm_params,
|
|
0, 0,
|
|
&kadm_handle);
|
|
if(ret)
|
|
krb5_err (context, 1, ret, "kadm5_init_with_password_ctx");
|
|
v5_loop (context, ac, initial, kadm_handle, fd);
|
|
}
|
|
|
|
krb5_error_code
|
|
kadmind_loop(krb5_context context,
|
|
krb5_auth_context ac,
|
|
krb5_keytab keytab,
|
|
int fd)
|
|
{
|
|
unsigned char tmp[4];
|
|
ssize_t n;
|
|
unsigned long len;
|
|
|
|
n = krb5_net_read(context, &fd, tmp, 4);
|
|
if(n == 0)
|
|
exit(0);
|
|
if(n < 0)
|
|
krb5_err(context, 1, errno, "read");
|
|
_krb5_get_int(tmp, &len, 4);
|
|
/* this v4 test could probably also go away */
|
|
if(len > 0xffff && (len & 0xffff) == ('K' << 8) + 'A') {
|
|
unsigned char v4reply[] = {
|
|
0x00, 0x0c,
|
|
'K', 'Y', 'O', 'U', 'L', 'O', 'S', 'E',
|
|
0x95, 0xb7, 0xa7, 0x08 /* KADM_BAD_VER */
|
|
};
|
|
krb5_net_write(context, &fd, v4reply, sizeof(v4reply));
|
|
krb5_errx(context, 1, "packet appears to be version 4");
|
|
} else {
|
|
handle_v5(context, ac, keytab, len, fd);
|
|
}
|
|
return 0;
|
|
}
|