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kgssapi: Add a new file with a function for a future commit

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A future commit needs a new upcall function that can do reverse
DNS in order to generate a "service principal".
This patch adds the file.

MFC after:	1 month
This commit is contained in:
Rick Macklem 2023-10-23 13:17:16 -07:00
parent 0514f032c8
commit 428879dc91
1 changed files with 85 additions and 0 deletions
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85
sys/kgssapi/gss_ip_to_dns.c Normal file
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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
* Authors: Doug Rabson <dfr@rabson.org>
* Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <sys/cdefs.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <kgssapi/gssapi.h>
#include <kgssapi/gssapi_impl.h>
#include "gssd.h"
OM_uint32
gss_ip_to_dns(OM_uint32 *minor_status,
char *ip_addr,
char *dns_name)
{
struct ip_to_dns_res res;
struct ip_to_dns_args args;
enum clnt_stat stat;
CLIENT *cl;
*minor_status = 0;
cl = kgss_gssd_client();
if (cl == NULL)
return (GSS_S_FAILURE);
args.ip_addr.ip_addr_len = strlen(ip_addr);
args.ip_addr.ip_addr_val = mem_alloc(args.ip_addr.ip_addr_len);
memcpy(args.ip_addr.ip_addr_val, ip_addr, args.ip_addr.ip_addr_len);
bzero(&res, sizeof(res));
stat = gssd_ip_to_dns_1(&args, &res, cl);
CLNT_RELEASE(cl);
if (stat != RPC_SUCCESS) {
*minor_status = stat;
return (GSS_S_FAILURE);
}
if (res.major_status != GSS_S_COMPLETE) {
*minor_status = res.minor_status;
return (res.major_status);
}
if (res.dns_name.dns_name_len == 0 ||
res.dns_name.dns_name_len >= NI_MAXHOST) {
*minor_status = 0;
return (GSS_S_FAILURE);
}
memcpy(dns_name, res.dns_name.dns_name_val, res.dns_name.dns_name_len);
dns_name[res.dns_name.dns_name_len] = '\0';
return (GSS_S_COMPLETE);
}