getpublickey.c revision 261046 
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: stable/10/lib/libc/rpc/getpublickey.c 261046 2014-01-22 23:45:27Z mav $");
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)() = 0;
60
61/*
62 * Get somebody's public key
63 */
64static int
65__getpublickey_real(netname, publickey)
66	const char *netname;
67	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(key, ret)
93	const char *key;
94	char *ret;
95{
96	char buf[1024];	/* big enough */
97	char *res;
98	FILE *fd;
99	char *mkey;
100	char *mval;
101
102	fd = fopen(PKFILE, "r");
103	if (fd == NULL)
104		return (0);
105	for (;;) {
106		res = fgets(buf, sizeof(buf), fd);
107		if (res == NULL) {
108			fclose(fd);
109			return (0);
110		}
111		if (res[0] == '#')
112			continue;
113		else if (res[0] == '+') {
114#ifdef YP
115			char *PKMAP = "publickey.byname";
116			char *lookup;
117			char *domain;
118			int err;
119			int len;
120
121			err = yp_get_default_domain(&domain);
122			if (err) {
123				continue;
124			}
125			lookup = NULL;
126			err = yp_match(domain, PKMAP, key, strlen(key), &lookup, &len);
127			if (err) {
128#ifdef DEBUG
129				fprintf(stderr, "match failed error %d\n", err);
130#endif
131				continue;
132			}
133			lookup[len] = 0;
134			strcpy(ret, lookup);
135			fclose(fd);
136			free(lookup);
137			return (2);
138#else /* YP */
139#ifdef DEBUG
140			fprintf(stderr,
141"Bad record in %s '+' -- NIS not supported in this library copy\n", PKFILE);
142#endif /* DEBUG */
143			continue;
144#endif /* YP */
145		} else {
146			mkey = strsep(&res, "\t ");
147			if (mkey == NULL) {
148				fprintf(stderr,
149				"Bad record in %s -- %s", PKFILE, buf);
150				continue;
151			}
152			do {
153				mval = strsep(&res, " \t#\n");
154			} while (mval != NULL && !*mval);
155			if (mval == NULL) {
156				fprintf(stderr,
157			"Bad record in %s val problem - %s", PKFILE, buf);
158				continue;
159			}
160			if (strcmp(mkey, key) == 0) {
161				strcpy(ret, mval);
162				fclose(fd);
163				return (1);
164			}
165		}
166	}
167}
168
169int getpublickey(netname, publickey)
170	const char *netname;
171	char *publickey;
172{
173	if (__getpublickey_LOCAL != NULL)
174		return(__getpublickey_LOCAL(netname, publickey));
175	else
176		return(__getpublickey_real(netname, publickey));
177}
178