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
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
216static void
217usage(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 */
228int
229setpublicmap(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
244struct passwd *
245ypgetpwuid(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