getpublickey.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2009, Sun Microsystems, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 *   this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 *   this list of conditions and the following disclaimer in the documentation
13 *   and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 *   contributors may be used to endorse or promote products derived
16 *   from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#if defined(LIBC_SCCS) && !defined(lint)
32static char sccsid[] = "@(#)publickey.c 1.10 91/03/11 Copyr 1986 Sun Micro";
33#endif
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: stable/11/lib/libc/rpc/getpublickey.c 330897 2018-03-14 03:19:51Z eadler $");
36
37/*
38 * publickey.c
39 * Copyright (C) 1986, Sun Microsystems, Inc.
40 */
41
42/*
43 * Public key lookup routines
44 */
45#include "namespace.h"
46#include <stdio.h>
47#include <pwd.h>
48#include <rpc/rpc.h>
49#include <rpc/key_prot.h>
50#include <rpcsvc/yp_prot.h>
51#include <rpcsvc/ypclnt.h>
52#include <string.h>
53#include <stdlib.h>
54#include "un-namespace.h"
55
56#define PKFILE "/etc/publickey"
57
58/*
59 * Hack to let ypserv/rpc.nisd use AUTH_DES.
60 */
61int (*__getpublickey_LOCAL)(const char *, char *) = 0;
62
63/*
64 * Get somebody's public key
65 */
66static int
67__getpublickey_real(const char *netname, char *publickey)
68{
69	char lookup[3 * HEXKEYBYTES];
70	char *p;
71
72	if (publickey == NULL)
73		return (0);
74	if (!getpublicandprivatekey(netname, lookup))
75		return (0);
76	p = strchr(lookup, ':');
77	if (p == NULL) {
78		return (0);
79	}
80	*p = '\0';
81	(void) strncpy(publickey, lookup, HEXKEYBYTES);
82	publickey[HEXKEYBYTES] = '\0';
83	return (1);
84}
85
86/*
87 * reads the file /etc/publickey looking for a + to optionally go to the
88 * yellow pages
89 */
90
91int
92getpublicandprivatekey(const char *key, char *ret)
93{
94	char buf[1024];	/* big enough */
95	char *res;
96	FILE *fd;
97	char *mkey;
98	char *mval;
99
100	fd = fopen(PKFILE, "r");
101	if (fd == NULL)
102		return (0);
103	for (;;) {
104		res = fgets(buf, sizeof(buf), fd);
105		if (res == NULL) {
106			fclose(fd);
107			return (0);
108		}
109		if (res[0] == '#')
110			continue;
111		else if (res[0] == '+') {
112#ifdef YP
113			char *PKMAP = "publickey.byname";
114			char *lookup;
115			char *domain;
116			int err;
117			int len;
118
119			err = yp_get_default_domain(&domain);
120			if (err) {
121				continue;
122			}
123			lookup = NULL;
124			err = yp_match(domain, PKMAP, key, strlen(key), &lookup, &len);
125			if (err) {
126#ifdef DEBUG
127				fprintf(stderr, "match failed error %d\n", err);
128#endif
129				continue;
130			}
131			lookup[len] = 0;
132			strcpy(ret, lookup);
133			fclose(fd);
134			free(lookup);
135			return (2);
136#else /* YP */
137#ifdef DEBUG
138			fprintf(stderr,
139"Bad record in %s '+' -- NIS not supported in this library copy\n", PKFILE);
140#endif /* DEBUG */
141			continue;
142#endif /* YP */
143		} else {
144			mkey = strsep(&res, "\t ");
145			if (mkey == NULL) {
146				fprintf(stderr,
147				"Bad record in %s -- %s", PKFILE, buf);
148				continue;
149			}
150			do {
151				mval = strsep(&res, " \t#\n");
152			} while (mval != NULL && !*mval);
153			if (mval == NULL) {
154				fprintf(stderr,
155			"Bad record in %s val problem - %s", PKFILE, buf);
156				continue;
157			}
158			if (strcmp(mkey, key) == 0) {
159				strcpy(ret, mval);
160				fclose(fd);
161				return (1);
162			}
163		}
164	}
165}
166
167int getpublickey(const char *netname, char *publickey)
168{
169	if (__getpublickey_LOCAL != NULL)
170		return(__getpublickey_LOCAL(netname, publickey));
171	else
172		return(__getpublickey_real(netname, publickey));
173}
174