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