1 /*
2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part. Users
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user or with the express written consent of
8 * Sun Microsystems, Inc.
9 *
10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
11 * WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
13 *
14 * Sun RPC is provided with no support and without any obligation on the
15 * part of Sun Microsystems, Inc. to assist in its use, correction,
16 * modification or enhancement.
17 *
18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
20 * OR ANY PART THEREOF.
21 *
22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
23 * or profits or other special, indirect and consequential damages, even if
24 * Sun has been advised of the possibility of such damages.
25 *
26 * Sun Microsystems, Inc.
27 * 2550 Garcia Avenue
28 * Mountain View, California 94043
29 */
30
31 #if 0
32 #ifndef lint
33 static char sccsid[] = "@(#)chkey.c 1.7 91/03/11 Copyr 1986 Sun Micro";
34 #endif
35 #endif
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: stable/9/usr.bin/chkey/chkey.c 215519 2010-11-19 10:18:58Z kevlo $");
39
40 /*
41 * Copyright (C) 1986, Sun Microsystems, Inc.
42 */
43
44 /*
45 * Command to change one's public key in the public key database
46 */
47 #include <rpc/rpc.h>
48 #include <rpc/key_prot.h>
49 #ifdef YP
50 #include <rpcsvc/yp_prot.h>
51 #include <rpcsvc/ypclnt.h>
52 #else
53 #define YPOP_STORE 4
54 #endif
55 #include <sys/fcntl.h>
56 #include <err.h>
57 #include <pwd.h>
58 #include <stdio.h>
59 #include <stdlib.h>
60 #include <string.h>
61 #include <unistd.h>
62
63 #include "extern.h"
64
65 #ifdef YPPASSWD
66 struct passwd *ypgetpwuid(uid_t);
67 #endif
68
69 #ifdef YP
70 static char *domain;
71 static char PKMAP[] = "publickey.byname";
72 #else
73 static char PKFILE[] = "/etc/publickey";
74 #endif /* YP */
75 static char ROOTKEY[] = "/etc/.rootkey";
76
77 static void usage(void);
78 extern int yp_update(char *, char *, int, char *, size_t, char *, size_t);
79
80 int
main(int argc,char ** argv)81 main(int argc, char **argv)
82 {
83 char name[MAXNETNAMELEN+1];
84 char public[HEXKEYBYTES + 1];
85 char secret[HEXKEYBYTES + 1];
86 char crypt1[HEXKEYBYTES + KEYCHECKSUMSIZE + 1];
87 char crypt2[HEXKEYBYTES + KEYCHECKSUMSIZE + 1];
88 int status;
89 char *pass;
90 struct passwd *pw;
91 uid_t uid;
92 int force = 0;
93 int ch;
94 #ifdef YP
95 char *master;
96 #endif
97
98 while ((ch = getopt(argc, argv, "f")) != -1)
99 switch(ch) {
100 case 'f':
101 force = 1;
102 break;
103 default:
104 usage();
105 }
106 argc -= optind;
107 argv += optind;
108
109 if (argc != 0)
110 usage();
111
112 #ifdef YP
113 (void)yp_get_default_domain(&domain);
114 if (yp_master(domain, PKMAP, &master) != 0)
115 errx(1, "can't find master of publickey database");
116 #endif
117 uid = getuid() /*geteuid()*/;
118 if (uid == 0) {
119 if (host2netname(name, NULL, NULL) == 0)
120 errx(1, "cannot convert hostname to netname");
121 } else {
122 if (user2netname(name, uid, NULL) == 0)
123 errx(1, "cannot convert username to netname");
124 }
125 (void)printf("Generating new key for %s.\n", name);
126
127 if (!force) {
128 if (uid != 0) {
129 #ifdef YPPASSWD
130 pw = ypgetpwuid(uid);
131 #else
132 pw = getpwuid(uid);
133 #endif
134 if (pw == NULL) {
135 #ifdef YPPASSWD
136 errx(1,
137 "no NIS password entry found: can't change key");
138 #else
139 errx(1,
140 "no password entry found: can't change key");
141 #endif
142 }
143 } else {
144 pw = getpwuid(0);
145 if (pw == NULL)
146 errx(1, "no password entry found: can't change key");
147 }
148 }
149 pass = getpass("Password:");
150 #ifdef YPPASSWD
151 if (!force) {
152 if (strcmp(crypt(pass, pw->pw_passwd), pw->pw_passwd) != 0)
153 errx(1, "invalid password");
154 }
155 #else
156 force = 1; /* Make this mandatory */
157 #endif
158 genkeys(public, secret, pass);
159
160 memcpy(crypt1, secret, HEXKEYBYTES);
161 memcpy(crypt1 + HEXKEYBYTES, secret, KEYCHECKSUMSIZE);
162 crypt1[HEXKEYBYTES + KEYCHECKSUMSIZE] = 0;
163 xencrypt(crypt1, pass);
164
165 if (force) {
166 memcpy(crypt2, crypt1, HEXKEYBYTES + KEYCHECKSUMSIZE + 1);
167 xdecrypt(crypt2, getpass("Retype password:"));
168 if (memcmp(crypt2, crypt2 + HEXKEYBYTES, KEYCHECKSUMSIZE) != 0
169 || memcmp(crypt2, secret, HEXKEYBYTES) != 0)
170 errx(1, "password incorrect");
171 }
172
173 #ifdef YP
174 (void)printf("Sending key change request to %s...\n", master);
175 #endif
176 status = setpublicmap(name, public, crypt1);
177 if (status != 0) {
178 #ifdef YP
179 errx(1, "unable to update NIS database (%u): %s",
180 status, yperr_string(status));
181 #else
182 errx(1, "unable to update publickey database");
183 #endif
184 }
185
186 if (uid == 0) {
187 /*
188 * Root users store their key in /etc/$ROOTKEY so
189 * that they can auto reboot without having to be
190 * around to type a password. Storing this in a file
191 * is rather dubious: it should really be in the EEPROM
192 * so it does not go over the net.
193 */
194 int fd;
195
196 fd = open(ROOTKEY, O_WRONLY|O_TRUNC|O_CREAT, 0);
197 if (fd < 0) {
198 warn("%s", ROOTKEY);
199 } else {
200 char newline = '\n';
201
202 if (write(fd, secret, strlen(secret)) < 0 ||
203 write(fd, &newline, sizeof(newline)) < 0)
204 warn("%s: write", ROOTKEY);
205 }
206 close(fd);
207 }
208
209 if (key_setsecret(secret) < 0)
210 errx(1, "unable to login with new secret key");
211 (void)printf("Done.\n");
212 exit(0);
213 /* NOTREACHED */
214 }
215
216 static void
usage(void)217 usage(void)
218 {
219 (void)fprintf(stderr, "usage: chkey [-f]\n");
220 exit(1);
221 /* NOTREACHED */
222 }
223
224
225 /*
226 * Set the entry in the public key file
227 */
228 int
setpublicmap(char * name,char * public,char * secret)229 setpublicmap(char *name, char *public, char *secret)
230 {
231 char pkent[1024];
232
233 (void)sprintf(pkent,"%s:%s", public, secret);
234 #ifdef YP
235 return (yp_update(domain, PKMAP, YPOP_STORE,
236 name, strlen(name), pkent, strlen(pkent)));
237 #else
238 return (localupdate(name, PKFILE, YPOP_STORE,
239 strlen(name), name, strlen(pkent), pkent));
240 #endif
241 }
242
243 #ifdef YPPASSWD
244 struct passwd *
ypgetpwuid(uid_t uid)245 ypgetpwuid(uid_t uid)
246 {
247 char uidstr[10];
248 char *val;
249 int vallen;
250 static struct passwd pw;
251 char *p;
252
253 (void)sprintf(uidstr, "%d", uid);
254 if (yp_match(domain, "passwd.byuid", uidstr, strlen(uidstr),
255 &val, &vallen) != 0) {
256 return (NULL);
257 }
258 p = strchr(val, ':');
259 if (p == NULL) {
260 return (NULL);
261 }
262 pw.pw_passwd = p + 1;
263 p = strchr(pw.pw_passwd, ':');
264 if (p == NULL) {
265 return (NULL);
266 }
267 *p = 0;
268 return (&pw);
269 }
270 #endif /* YPPASSWD */
271