xref: /freebsd/lib/libc/rpc/getpublickey.c (revision 43faedc1339a9624c7acedb7f3e5624e64da5b99)
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)
30 static 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  */
59 int (*__getpublickey_LOCAL)(const char *, char *) = 0;
60 
61 /*
62  * Get somebody's public key
63  */
64 static 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 
89 int
90 getpublicandprivatekey(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 
165 int 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