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 /*
32 * publickey.c
33 * Copyright (C) 1986, Sun Microsystems, Inc.
34 */
35
36 /*
37 * Public key lookup routines
38 */
39 #include "namespace.h"
40 #include <stdio.h>
41 #include <pwd.h>
42 #include <rpc/rpc.h>
43 #include <rpc/key_prot.h>
44 #include <rpcsvc/yp_prot.h>
45 #include <rpcsvc/ypclnt.h>
46 #include <string.h>
47 #include <stdlib.h>
48 #include "un-namespace.h"
49
50 #define PKFILE "/etc/publickey"
51
52 /*
53 * Hack to let ypserv/rpc.nisd use AUTH_DES.
54 */
55 int (*__getpublickey_LOCAL)(const char *, char *) = 0;
56
57 /*
58 * Get somebody's public key
59 */
60 static int
__getpublickey_real(const char * netname,char * publickey)61 __getpublickey_real(const char *netname, char *publickey)
62 {
63 char lookup[3 * HEXKEYBYTES];
64 char *p;
65
66 if (publickey == NULL)
67 return (0);
68 if (!getpublicandprivatekey(netname, lookup))
69 return (0);
70 p = strchr(lookup, ':');
71 if (p == NULL) {
72 return (0);
73 }
74 *p = '\0';
75 (void) strncpy(publickey, lookup, HEXKEYBYTES);
76 publickey[HEXKEYBYTES] = '\0';
77 return (1);
78 }
79
80 /*
81 * reads the file /etc/publickey looking for a + to optionally go to the
82 * yellow pages
83 */
84
85 int
getpublicandprivatekey(const char * key,char * ret)86 getpublicandprivatekey(const char *key, char *ret)
87 {
88 char buf[1024]; /* big enough */
89 char *res;
90 FILE *fd;
91 char *mkey;
92 char *mval;
93
94 fd = fopen(PKFILE, "r");
95 if (fd == NULL)
96 return (0);
97 for (;;) {
98 res = fgets(buf, sizeof(buf), fd);
99 if (res == NULL) {
100 fclose(fd);
101 return (0);
102 }
103 if (res[0] == '#')
104 continue;
105 else if (res[0] == '+') {
106 #ifdef YP
107 char *PKMAP = "publickey.byname";
108 char *lookup;
109 char *domain;
110 int err;
111 int len;
112
113 err = yp_get_default_domain(&domain);
114 if (err) {
115 continue;
116 }
117 lookup = NULL;
118 err = yp_match(domain, PKMAP, key, strlen(key), &lookup, &len);
119 if (err) {
120 #ifdef DEBUG
121 fprintf(stderr, "match failed error %d\n", err);
122 #endif
123 continue;
124 }
125 lookup[len] = 0;
126 strcpy(ret, lookup);
127 fclose(fd);
128 free(lookup);
129 return (2);
130 #else /* YP */
131 #ifdef DEBUG
132 fprintf(stderr,
133 "Bad record in %s '+' -- NIS not supported in this library copy\n", PKFILE);
134 #endif /* DEBUG */
135 continue;
136 #endif /* YP */
137 } else {
138 mkey = strsep(&res, "\t ");
139 if (mkey == NULL) {
140 fprintf(stderr,
141 "Bad record in %s -- %s", PKFILE, buf);
142 continue;
143 }
144 do {
145 mval = strsep(&res, " \t#\n");
146 } while (mval != NULL && !*mval);
147 if (mval == NULL) {
148 fprintf(stderr,
149 "Bad record in %s val problem - %s", PKFILE, buf);
150 continue;
151 }
152 if (strcmp(mkey, key) == 0) {
153 strcpy(ret, mval);
154 fclose(fd);
155 return (1);
156 }
157 }
158 }
159 }
160
getpublickey(const char * netname,char * publickey)161 int getpublickey(const char *netname, char *publickey)
162 {
163 if (__getpublickey_LOCAL != NULL)
164 return(__getpublickey_LOCAL(netname, publickey));
165 else
166 return(__getpublickey_real(netname, publickey));
167 }
168