1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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
30 #include <errno.h>
31 #include <pwd.h>
32
33 #include "krb5/gsskrb5_locl.h"
34
35 OM_uint32
_gsskrb5_pname_to_uid(OM_uint32 * minor_status,const gss_name_t pname,const gss_OID mech,uid_t * uidp)36 _gsskrb5_pname_to_uid(OM_uint32 *minor_status, const gss_name_t pname,
37 const gss_OID mech, uid_t *uidp)
38 {
39 krb5_context context;
40 krb5_const_principal name = (krb5_const_principal) pname;
41 krb5_error_code kret;
42 char lname[MAXLOGNAME + 1], buf[1024], *bufp;
43 struct passwd pwd, *pw;
44 size_t buflen;
45 int error;
46 OM_uint32 ret;
47 static size_t buflen_hint = 1024;
48
49 GSSAPI_KRB5_INIT (&context);
50
51 kret = krb5_aname_to_localname(context, name, sizeof(lname), lname);
52 if (kret) {
53 *minor_status = kret;
54 return (GSS_S_FAILURE);
55 }
56
57 *minor_status = 0;
58 buflen = buflen_hint;
59 for (;;) {
60 pw = NULL;
61 bufp = buf;
62 if (buflen > sizeof(buf))
63 bufp = malloc(buflen);
64 if (bufp == NULL)
65 break;
66 error = getpwnam_r(lname, &pwd, bufp, buflen, &pw);
67 if (error != ERANGE)
68 break;
69 if (buflen > sizeof(buf))
70 free(bufp);
71 buflen += 1024;
72 if (buflen > buflen_hint)
73 buflen_hint = buflen;
74 }
75 if (pw) {
76 *uidp = pw->pw_uid;
77 ret = GSS_S_COMPLETE;
78 } else {
79 ret = GSS_S_FAILURE;
80 }
81 if (bufp != NULL && buflen > sizeof(buf))
82 free(bufp);
83 return (ret);
84 }
85