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
33static 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("$FreeBSD$");
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
66struct passwd *ypgetpwuid(uid_t);
67#endif
68
69#ifdef YP
70static char *domain;
71static char PKMAP[] = "publickey.byname";
72#else
73static char PKFILE[] = "/etc/publickey";
74#endif	/* YP */
75static char ROOTKEY[] = "/etc/.rootkey";
76
77static void usage(void);
78extern int yp_update(char *, char *, int, char *, size_t, char *, size_t);
79
80int
81main(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#ifdef YPPASSWD
98	char *cryptpw;
99#endif
100
101	while ((ch = getopt(argc, argv, "f")) != -1)
102		switch(ch) {
103		case 'f':
104			force = 1;
105			break;
106		default:
107			usage();
108		}
109	argc -= optind;
110	argv += optind;
111
112	if (argc != 0)
113		usage();
114
115#ifdef YP
116	(void)yp_get_default_domain(&domain);
117	if (yp_master(domain, PKMAP, &master) != 0)
118		errx(1, "can't find master of publickey database");
119#endif
120	uid = getuid() /*geteuid()*/;
121	if (uid == 0) {
122		if (host2netname(name, NULL, NULL) == 0)
123			errx(1, "cannot convert hostname to netname");
124	} else {
125		if (user2netname(name, uid, NULL) == 0)
126			errx(1, "cannot convert username to netname");
127	}
128	(void)printf("Generating new key for %s.\n", name);
129
130	if (!force) {
131		if (uid != 0) {
132#ifdef YPPASSWD
133			pw = ypgetpwuid(uid);
134#else
135			pw = getpwuid(uid);
136#endif
137			if (pw == NULL) {
138#ifdef YPPASSWD
139				errx(1,
140			"no NIS password entry found: can't change key");
141#else
142				errx(1,
143			"no password entry found: can't change key");
144#endif
145			}
146		} else {
147			pw = getpwuid(0);
148			if (pw == NULL)
149			  errx(1, "no password entry found: can't change key");
150		}
151	}
152	pass = getpass("Password:");
153#ifdef YPPASSWD
154	if (!force) {
155		cryptpw = crypt(pass, pw->pw_passwd);
156		if (cryptpw == NULL || strcmp(cryptpw, pw->pw_passwd) != 0)
157			errx(1, "invalid password");
158	}
159#else
160	force = 1;	/* Make this mandatory */
161#endif
162	genkeys(public, secret, pass);
163
164	memcpy(crypt1, secret, HEXKEYBYTES);
165	memcpy(crypt1 + HEXKEYBYTES, secret, KEYCHECKSUMSIZE);
166	crypt1[HEXKEYBYTES + KEYCHECKSUMSIZE] = 0;
167	xencrypt(crypt1, pass);
168
169	if (force) {
170		memcpy(crypt2, crypt1, HEXKEYBYTES + KEYCHECKSUMSIZE + 1);
171		xdecrypt(crypt2, getpass("Retype password:"));
172		if (memcmp(crypt2, crypt2 + HEXKEYBYTES, KEYCHECKSUMSIZE) != 0
173			|| memcmp(crypt2, secret, HEXKEYBYTES) != 0)
174			errx(1, "password incorrect");
175	}
176
177#ifdef YP
178	(void)printf("Sending key change request to %s...\n", master);
179#endif
180	status = setpublicmap(name, public, crypt1);
181	if (status != 0) {
182#ifdef YP
183		errx(1, "unable to update NIS database (%u): %s",
184				status, yperr_string(status));
185#else
186		errx(1, "unable to update publickey database");
187#endif
188	}
189
190	if (uid == 0) {
191		/*
192		 * Root users store their key in /etc/$ROOTKEY so
193		 * that they can auto reboot without having to be
194		 * around to type a password. Storing this in a file
195		 * is rather dubious: it should really be in the EEPROM
196		 * so it does not go over the net.
197		 */
198		int fd;
199
200		fd = open(ROOTKEY, O_WRONLY|O_TRUNC|O_CREAT, 0);
201		if (fd < 0) {
202			warn("%s", ROOTKEY);
203		} else {
204			char newline = '\n';
205
206			if (write(fd, secret, strlen(secret)) < 0 ||
207			    write(fd, &newline, sizeof(newline)) < 0)
208				warn("%s: write", ROOTKEY);
209		}
210		close(fd);
211	}
212
213	if (key_setsecret(secret) < 0)
214		errx(1, "unable to login with new secret key");
215	(void)printf("Done.\n");
216	exit(0);
217	/* NOTREACHED */
218}
219
220static void
221usage(void)
222{
223	(void)fprintf(stderr, "usage: chkey [-f]\n");
224	exit(1);
225	/* NOTREACHED */
226}
227
228
229/*
230 * Set the entry in the public key file
231 */
232int
233setpublicmap(char *name, char *public, char *secret)
234{
235	char pkent[1024];
236
237	(void)sprintf(pkent,"%s:%s", public, secret);
238#ifdef YP
239	return (yp_update(domain, PKMAP, YPOP_STORE,
240		name, strlen(name), pkent, strlen(pkent)));
241#else
242	return (localupdate(name, PKFILE, YPOP_STORE,
243		strlen(name), name, strlen(pkent), pkent));
244#endif
245}
246
247#ifdef YPPASSWD
248struct passwd *
249ypgetpwuid(uid_t uid)
250{
251	char uidstr[10];
252	char *val;
253	int vallen;
254	static struct passwd pw;
255	char *p;
256
257	(void)sprintf(uidstr, "%d", uid);
258	if (yp_match(domain, "passwd.byuid", uidstr, strlen(uidstr),
259			&val, &vallen) != 0) {
260		return (NULL);
261	}
262	p = strchr(val, ':');
263	if (p == NULL) {
264		return (NULL);
265	}
266	pw.pw_passwd = p + 1;
267	p = strchr(pw.pw_passwd, ':');
268	if (p == NULL) {
269		return (NULL);
270	}
271	*p = 0;
272	return (&pw);
273}
274#endif	/* YPPASSWD */
275