6b45c3512e
The online LIST interrupt message is a NOP, but it's expected to not have a reply (the server doesn't send one if it receives it before the LIST finishes). However, if the interrupt message arrives after the LIST finished, then it does get a reply, and this causes the client to get out of step with the server. Fixes include: 1) flavor the interrupt NOP to make sure it never gets a reply, 2) introduce a new kadm_list_interrtupt message that is like a NOP that produces no reply 3) always consume -after the LIST ends- a reply to any list interrupt NOP on the client side. This implements (1).
304 lines
8.6 KiB
C
304 lines
8.6 KiB
C
/*
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* Copyright (c) 1997 - 1999 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 "kadm5_locl.h"
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RCSID("$Id$");
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kadm5_ret_t
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kadm5_c_get_principals(void *server_handle,
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const char *expression,
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char ***princs,
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int *count)
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{
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kadm5_client_context *context = server_handle;
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kadm5_ret_t ret;
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krb5_storage *sp;
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unsigned char buf[1024];
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int32_t tmp;
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krb5_data reply;
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int i;
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*count = 0;
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*princs = NULL;
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ret = _kadm5_connect(server_handle, 0 /* want_write */);
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if (ret)
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return ret;
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krb5_data_zero(&reply);
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sp = krb5_storage_from_mem(buf, sizeof(buf));
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if (sp == NULL) {
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ret = krb5_enomem(context->context);
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goto out_keep_error;
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}
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ret = krb5_store_int32(sp, kadm_get_princs);
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if (ret)
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goto out;
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ret = krb5_store_int32(sp, expression != NULL ? 1 : 0);
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if (ret)
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goto out;
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if (expression) {
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ret = krb5_store_string(sp, expression);
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if (ret)
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goto out;
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}
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ret = _kadm5_client_send(context, sp);
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if (ret)
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goto out_keep_error;
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ret = _kadm5_client_recv(context, &reply);
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if (ret)
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goto out_keep_error;
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krb5_storage_free(sp);
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sp = krb5_storage_from_data (&reply);
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if (sp == NULL) {
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ret = krb5_enomem(context->context);
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goto out_keep_error;
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}
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ret = krb5_ret_int32(sp, &tmp);
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if (ret == 0)
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ret = tmp;
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if (ret)
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goto out;
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ret = krb5_ret_int32(sp, &tmp);
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if (ret)
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goto out;
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*princs = calloc(tmp + 1, sizeof(**princs));
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if (*princs == NULL) {
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ret = krb5_enomem(context->context);
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goto out_keep_error;
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}
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for (i = 0; i < tmp; i++) {
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ret = krb5_ret_string(sp, &(*princs)[i]);
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if (ret)
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goto out;
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}
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*count = tmp;
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out:
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krb5_clear_error_message(context->context);
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out_keep_error:
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krb5_storage_free(sp);
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krb5_data_free(&reply);
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return ret;
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}
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kadm5_ret_t
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kadm5_c_iter_principals(void *server_handle,
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const char *expression,
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int (*cb)(void *, const char *),
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void *cbdata)
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{
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kadm5_client_context *context = server_handle;
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kadm5_ret_t ret;
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krb5_storage *sp;
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unsigned char buf[1024];
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int32_t tmp;
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krb5_data reply;
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size_t i;
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ret = _kadm5_connect(server_handle, 0 /* want_write */);
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if (ret)
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return ret;
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krb5_data_zero(&reply);
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sp = krb5_storage_from_mem(buf, sizeof(buf));
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if (sp == NULL) {
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ret = krb5_enomem(context->context);
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goto out_keep_error;
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}
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ret = krb5_store_int32(sp, kadm_get_princs);
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if (ret)
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goto out;
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/*
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* Our protocol has an int boolean for this operation to indicate whether
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* there's an expression. What we'll do here is that instead of sending
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* just false or trueish, for online iteration we'll send a number other
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* than 0 or 1 -- a magic value > 0 and < INT_MAX.
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*
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* In response we'll expect multiple replies, each with up to some small
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* number of principal names. See kadmin/server.c.
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*/
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ret = krb5_store_int32(sp, 0x55555555);
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if (ret)
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goto out;
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ret = krb5_store_string(sp, expression ? expression : "");
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if (ret)
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goto out;
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ret = _kadm5_client_send(context, sp);
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if (ret)
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goto out_keep_error;
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ret = _kadm5_client_recv(context, &reply);
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if (ret)
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goto out_keep_error;
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krb5_storage_free(sp);
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sp = krb5_storage_from_data (&reply);
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if (sp == NULL) {
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ret = krb5_enomem(context->context);
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goto out_keep_error;
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}
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ret = krb5_ret_int32(sp, &tmp);
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if (ret == 0)
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ret = tmp;
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if (ret)
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goto out;
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ret = krb5_ret_int32(sp, &tmp);
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if (ret)
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goto out;
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if (tmp < 0) {
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size_t n = -tmp;
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int more = 1;
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int stop = 0;
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/* The server supports online iteration, hooray! */
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while (more) {
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/*
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* We expect any number of chunks, each having `n' names, except
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* the last one would have fewer than `n' (possibly zero, even).
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*
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* After that we expect one more reply with just a final return
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* code.
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*/
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krb5_data_free(&reply);
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krb5_storage_free(sp);
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sp = NULL;
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ret = _kadm5_client_recv(context, &reply);
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if (ret == 0 && (sp = krb5_storage_from_data(&reply)) == NULL)
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ret = krb5_enomem(context->context);
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if (ret)
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goto out;
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/* Every chunk begins with a status code */
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ret = krb5_ret_int32(sp, &tmp);
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if (ret == 0)
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ret = tmp;
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if (ret)
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goto out;
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/* We expect up to -tmp principals per reply */
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for (i = 0; i < n; i++) {
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char *princ = NULL;
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ret = krb5_ret_string(sp, &princ);
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if (ret == HEIM_ERR_EOF) {
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/* This was the last reply */
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more = 0;
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ret = 0;
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break;
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}
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if (ret)
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goto out;
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if (!stop) {
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stop = cb(cbdata, princ);
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if (stop) {
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/*
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* Tell the server to stop.
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*
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* We use a NOP for this, but with a payload that says
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* "don't reply to the NOP" just in case the NOP
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* arrives and is processed _after_ the LISTing has
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* finished.
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*/
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krb5_storage_free(sp);
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if ((sp = krb5_storage_emem()) &&
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krb5_store_int32(sp, kadm_nop) == 0 &&
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krb5_store_int32(sp, 0))
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(void) _kadm5_client_send(context, sp);
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}
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}
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free(princ);
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}
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if (!more) {
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if (ret == 0)
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ret = stop;
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break;
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}
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}
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/* Get the final result code */
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krb5_data_free(&reply);
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krb5_storage_free(sp);
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sp = NULL;
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ret = _kadm5_client_recv(context, &reply);
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if (ret == 0 && (sp = krb5_storage_from_data(&reply)) == NULL)
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ret = krb5_enomem(context->context);
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if (ret)
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goto out;
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ret = krb5_ret_int32(sp, &tmp);
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if (ret == 0)
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ret = tmp;
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if (!stop) {
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/*
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* Send our "interrupt" after the last chunk if we hand't
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* interrupted already.
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*/
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krb5_storage_free(sp);
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if ((sp = krb5_storage_emem()) &&
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krb5_store_int32(sp, kadm_nop) == 0)
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(void) _kadm5_client_send(context, sp);
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}
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} else {
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size_t n = tmp;
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/* Old server -- listing not online */
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for (i = 0; i < n; i++) {
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char *princ = NULL;
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ret = krb5_ret_string(sp, &princ);
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if (ret)
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goto out;
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cb(cbdata, princ);
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free(princ);
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}
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}
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out:
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krb5_clear_error_message(context->context);
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out_keep_error:
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krb5_storage_free(sp);
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krb5_data_free(&reply);
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return ret;
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}
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