pname_to_uid.c revision 330449 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
5 * Authors: Doug Rabson <dfr@rabson.org>
6 * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29/* $FreeBSD: stable/11/kerberos5/lib/libgssapi_krb5/pname_to_uid.c 330449 2018-03-05 07:26:05Z eadler $ */
30
31#include <errno.h>
32#include <pwd.h>
33
34#include "krb5/gsskrb5_locl.h"
35
36OM_uint32
37_gsskrb5_pname_to_uid(OM_uint32 *minor_status, const gss_name_t pname,
38    const gss_OID mech, uid_t *uidp)
39{
40	krb5_context context;
41	krb5_const_principal name = (krb5_const_principal) pname;
42	krb5_error_code kret;
43	char lname[MAXLOGNAME + 1], buf[1024], *bufp;
44	struct passwd pwd, *pw;
45	size_t buflen;
46	int error;
47	OM_uint32 ret;
48	static size_t buflen_hint = 1024;
49
50	GSSAPI_KRB5_INIT (&context);
51
52	kret = krb5_aname_to_localname(context, name, sizeof(lname), lname);
53	if (kret) {
54		*minor_status = kret;
55		return (GSS_S_FAILURE);
56	}
57
58	*minor_status = 0;
59	buflen = buflen_hint;
60	for (;;) {
61		pw = NULL;
62		bufp = buf;
63		if (buflen > sizeof(buf))
64			bufp = malloc(buflen);
65		if (bufp == NULL)
66			break;
67		error = getpwnam_r(lname, &pwd, bufp, buflen, &pw);
68		if (error != ERANGE)
69			break;
70		if (buflen > sizeof(buf))
71			free(bufp);
72		buflen += 1024;
73		if (buflen > buflen_hint)
74			buflen_hint = buflen;
75	}
76	if (pw) {
77		*uidp = pw->pw_uid;
78		ret = GSS_S_COMPLETE;
79	} else {
80		ret = GSS_S_FAILURE;
81	}
82	if (bufp != NULL && buflen > sizeof(buf))
83		free(bufp);
84	return (ret);
85}
86