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#include <sys/cdefs.h>
32/*
33 * Copyright (C) 1986, Sun Microsystems, Inc.
34 */
35
36/*
37 * Command to change one's public key in the public key database
38 */
39#include <rpc/rpc.h>
40#include <rpc/key_prot.h>
41#ifdef YP
42#include <rpcsvc/yp_prot.h>
43#include <rpcsvc/ypclnt.h>
44#else
45#define	YPOP_STORE	4
46#endif
47#include <sys/fcntl.h>
48#include <err.h>
49#include <pwd.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <string.h>
53#include <unistd.h>
54
55#include "extern.h"
56
57#ifdef YPPASSWD
58struct passwd *ypgetpwuid(uid_t);
59#endif
60
61#ifdef YP
62static char *domain;
63static char PKMAP[] = "publickey.byname";
64#else
65static char PKFILE[] = "/etc/publickey";
66#endif	/* YP */
67static char ROOTKEY[] = "/etc/.rootkey";
68
69static void usage(void) __dead2;
70extern int yp_update(char *, char *, int, char *, size_t, char *, size_t);
71
72int
73main(int argc, char **argv)
74{
75	char name[MAXNETNAMELEN+1];
76	char public[HEXKEYBYTES + 1];
77	char secret[HEXKEYBYTES + 1];
78	char crypt1[HEXKEYBYTES + KEYCHECKSUMSIZE + 1];
79	char crypt2[HEXKEYBYTES + KEYCHECKSUMSIZE + 1];
80	int status;
81	char *pass;
82	struct passwd *pw;
83	uid_t uid;
84	int force = 0;
85	int ch;
86#ifdef YP
87	char *master;
88#endif
89#ifdef YPPASSWD
90	char *cryptpw;
91#endif
92
93	while ((ch = getopt(argc, argv, "f")) != -1)
94		switch(ch) {
95		case 'f':
96			force = 1;
97			break;
98		default:
99			usage();
100		}
101	argc -= optind;
102	argv += optind;
103
104	if (argc != 0)
105		usage();
106
107#ifdef YP
108	(void)yp_get_default_domain(&domain);
109	if (yp_master(domain, PKMAP, &master) != 0)
110		errx(1, "can't find master of publickey database");
111#endif
112	uid = getuid() /*geteuid()*/;
113	if (uid == 0) {
114		if (host2netname(name, NULL, NULL) == 0)
115			errx(1, "cannot convert hostname to netname");
116	} else {
117		if (user2netname(name, uid, NULL) == 0)
118			errx(1, "cannot convert username to netname");
119	}
120	(void)printf("Generating new key for %s.\n", name);
121
122	if (!force) {
123		if (uid != 0) {
124#ifdef YPPASSWD
125			pw = ypgetpwuid(uid);
126#else
127			pw = getpwuid(uid);
128#endif
129			if (pw == NULL) {
130#ifdef YPPASSWD
131				errx(1,
132			"no NIS password entry found: can't change key");
133#else
134				errx(1,
135			"no password entry found: can't change key");
136#endif
137			}
138		} else {
139			pw = getpwuid(0);
140			if (pw == NULL)
141			  errx(1, "no password entry found: can't change key");
142		}
143	}
144	pass = getpass("Password:");
145#ifdef YPPASSWD
146	if (!force) {
147		cryptpw = crypt(pass, pw->pw_passwd);
148		if (cryptpw == NULL || strcmp(cryptpw, pw->pw_passwd) != 0)
149			errx(1, "invalid password");
150	}
151#else
152	force = 1;	/* Make this mandatory */
153#endif
154	genkeys(public, secret, pass);
155
156	memcpy(crypt1, secret, HEXKEYBYTES);
157	memcpy(crypt1 + HEXKEYBYTES, secret, KEYCHECKSUMSIZE);
158	crypt1[HEXKEYBYTES + KEYCHECKSUMSIZE] = 0;
159	xencrypt(crypt1, pass);
160
161	if (force) {
162		memcpy(crypt2, crypt1, HEXKEYBYTES + KEYCHECKSUMSIZE + 1);
163		xdecrypt(crypt2, getpass("Retype password:"));
164		if (memcmp(crypt2, crypt2 + HEXKEYBYTES, KEYCHECKSUMSIZE) != 0
165			|| memcmp(crypt2, secret, HEXKEYBYTES) != 0)
166			errx(1, "password incorrect");
167	}
168
169#ifdef YP
170	(void)printf("Sending key change request to %s...\n", master);
171#endif
172	status = setpublicmap(name, public, crypt1);
173	if (status != 0) {
174#ifdef YP
175		errx(1, "unable to update NIS database (%u): %s",
176				status, yperr_string(status));
177#else
178		errx(1, "unable to update publickey database");
179#endif
180	}
181
182	if (uid == 0) {
183		/*
184		 * Root users store their key in /etc/$ROOTKEY so
185		 * that they can auto reboot without having to be
186		 * around to type a password. Storing this in a file
187		 * is rather dubious: it should really be in the EEPROM
188		 * so it does not go over the net.
189		 */
190		int fd;
191
192		fd = open(ROOTKEY, O_WRONLY|O_TRUNC|O_CREAT, 0);
193		if (fd < 0) {
194			warn("%s", ROOTKEY);
195		} else {
196			char newline = '\n';
197
198			if (write(fd, secret, strlen(secret)) < 0 ||
199			    write(fd, &newline, sizeof(newline)) < 0)
200				warn("%s: write", ROOTKEY);
201		}
202		close(fd);
203	}
204
205	if (key_setsecret(secret) < 0)
206		errx(1, "unable to login with new secret key");
207	(void)printf("Done.\n");
208	exit(0);
209	/* NOTREACHED */
210}
211
212static void
213usage(void)
214{
215	(void)fprintf(stderr, "usage: chkey [-f]\n");
216	exit(1);
217	/* NOTREACHED */
218}
219
220
221/*
222 * Set the entry in the public key file
223 */
224int
225setpublicmap(char *name, char *public, char *secret)
226{
227	char pkent[1024];
228
229	(void)sprintf(pkent,"%s:%s", public, secret);
230#ifdef YP
231	return (yp_update(domain, PKMAP, YPOP_STORE,
232		name, strlen(name), pkent, strlen(pkent)));
233#else
234	return (localupdate(name, PKFILE, YPOP_STORE,
235		strlen(name), name, strlen(pkent), pkent));
236#endif
237}
238
239#ifdef YPPASSWD
240struct passwd *
241ypgetpwuid(uid_t uid)
242{
243	char uidstr[10];
244	char *val;
245	int vallen;
246	static struct passwd pw;
247	char *p;
248
249	(void)sprintf(uidstr, "%d", uid);
250	if (yp_match(domain, "passwd.byuid", uidstr, strlen(uidstr),
251			&val, &vallen) != 0) {
252		return (NULL);
253	}
254	p = strchr(val, ':');
255	if (p == NULL) {
256		return (NULL);
257	}
258	pw.pw_passwd = p + 1;
259	p = strchr(pw.pw_passwd, ':');
260	if (p == NULL) {
261		return (NULL);
262	}
263	*p = 0;
264	return (&pw);
265}
266#endif	/* YPPASSWD */
267