Annotation of src/usr.bin/passwd/yp_passwd.c, Revision 1.14
1.14 ! provos 1: /* $OpenBSD: yp_passwd.c,v 1.13 2000/06/30 16:00:20 millert Exp $ */
1.2 deraadt 2:
1.1 deraadt 3: /*
4: * Copyright (c) 1988 The Regents of the University of California.
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
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35: #ifndef lint
36: /*static char sccsid[] = "from: @(#)yp_passwd.c 1.0 2/2/93";*/
1.14 ! provos 37: static char rcsid[] = "$OpenBSD: yp_passwd.c,v 1.13 2000/06/30 16:00:20 millert Exp $";
1.1 deraadt 38: #endif /* not lint */
39:
40: #ifdef YP
41:
42: #include <stdio.h>
1.8 weingart 43: #include <stdlib.h>
1.1 deraadt 44: #include <string.h>
1.8 weingart 45: #include <unistd.h>
1.1 deraadt 46: #include <netdb.h>
47: #include <time.h>
48: #include <pwd.h>
1.8 weingart 49: #include <err.h>
1.1 deraadt 50: #include <errno.h>
1.8 weingart 51: #include <ctype.h>
1.1 deraadt 52: #include <rpc/rpc.h>
53: #include <rpcsvc/yp_prot.h>
54: #include <rpcsvc/ypclnt.h>
55: #define passwd yp_passwd_rec
56: #include <rpcsvc/yppasswd.h>
57: #undef passwd
58:
59: #ifndef _PASSWORD_LEN
60: #define _PASSWORD_LEN PASS_MAX
61: #endif
62:
1.14 ! provos 63: extern int pwd_gensalt __P(( char *, int, struct passwd *, char));
! 64: extern int pwd_check __P((struct passwd *, char *));
! 65: extern int pwd_gettries __P((struct passwd *));
! 66:
1.1 deraadt 67: static char *getnewpasswd();
68: static struct passwd *ypgetpwnam();
69:
70: static uid_t uid;
71: char *domain;
72:
1.8 weingart 73: static int
1.1 deraadt 74: pw_error(name, err, eval)
75: char *name;
76: int err, eval;
77: {
1.8 weingart 78: if(err)
1.13 millert 79: warn("%s", name);
1.1 deraadt 80:
1.8 weingart 81: warnx("YP passwd database unchanged.");
1.1 deraadt 82: exit(eval);
83: }
84:
1.8 weingart 85: int
1.1 deraadt 86: yp_passwd(username)
87: char *username;
88: {
89: char *master;
90: int r, rpcport, status;
91: struct yppasswd yppasswd;
92: struct passwd *pw;
93: struct timeval tv;
94: CLIENT *client;
95:
96: uid = getuid();
97:
98: /*
99: * Get local domain
100: */
1.8 weingart 101: if ((r = yp_get_default_domain(&domain)) != 0) {
102: warnx("can't get local YP domain. Reason: %s", yperr_string(r));
1.1 deraadt 103: exit(1);
104: }
105:
106: /*
107: * Find the host for the passwd map; it should be running
108: * the daemon.
109: */
110: if ((r = yp_master(domain, "passwd.byname", &master)) != 0) {
1.9 millert 111: warnx("can't find the master YP server. Reason: %s",
112: yperr_string(r));
1.1 deraadt 113: exit(1);
114: }
115:
116: /*
117: * Ask the portmapper for the port of the daemon.
118: */
119: if ((rpcport = getrpcport(master, YPPASSWDPROG,
120: YPPASSWDPROC_UPDATE, IPPROTO_UDP)) == 0) {
1.8 weingart 121: warnx("master YP server not running yppasswd daemon.");
122: warnx("Can't change password.");
1.1 deraadt 123: exit(1);
124: }
125:
126: /*
127: * Be sure the port is priviledged
128: */
129: if (rpcport >= IPPORT_RESERVED) {
1.8 weingart 130: warnx("yppasswd daemon is on an invalid port.");
1.1 deraadt 131: exit(1);
132: }
133:
134: /* Get user's login identity */
135: if (!(pw = ypgetpwnam(username))) {
1.8 weingart 136: warnx("unknown user %s.", username);
1.1 deraadt 137: exit(1);
138: }
139:
140: if (uid && uid != pw->pw_uid) {
1.8 weingart 141: warnx("you may only change your own password: %s", strerror(EACCES));
1.1 deraadt 142: exit(1);
143: }
144:
145: /* prompt for new password */
146: yppasswd.newpw.pw_passwd = getnewpasswd(pw, &yppasswd.oldpass);
147:
148: /* tell rpc.yppasswdd */
149: yppasswd.newpw.pw_name = pw->pw_name;
150: yppasswd.newpw.pw_uid = pw->pw_uid;
151: yppasswd.newpw.pw_gid = pw->pw_gid;
152: yppasswd.newpw.pw_gecos = pw->pw_gecos;
153: yppasswd.newpw.pw_dir = pw->pw_dir;
154: yppasswd.newpw.pw_shell = pw->pw_shell;
155:
156: client = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp");
157: if (client==NULL) {
1.9 millert 158: warnx("cannot contact yppasswdd on %s: Reason: %s",
1.1 deraadt 159: master, yperr_string(YPERR_YPBIND));
1.7 provos 160: free(yppasswd.newpw.pw_passwd);
1.1 deraadt 161: return(YPERR_YPBIND);
162: }
163: client->cl_auth = authunix_create_default();
164: tv.tv_sec = 2;
165: tv.tv_usec = 0;
166: r = clnt_call(client, YPPASSWDPROC_UPDATE,
1.3 deraadt 167: xdr_yppasswd, &yppasswd, xdr_int, &status, tv);
1.1 deraadt 168: if (r)
1.8 weingart 169: warnx("rpc to yppasswdd failed.");
1.3 deraadt 170: else if (status) {
1.1 deraadt 171: printf("Couldn't change YP password.\n");
1.7 provos 172: free(yppasswd.newpw.pw_passwd);
1.3 deraadt 173: exit(1);
174: }
175: printf("The YP password has been changed on %s, the master YP passwd server.\n",
176: master);
1.7 provos 177: free(yppasswd.newpw.pw_passwd);
1.1 deraadt 178: exit(0);
179: }
180:
181: static char *
182: getnewpasswd(pw, old_pass)
183: register struct passwd *pw;
184: char **old_pass;
185: {
186: static char buf[_PASSWORD_LEN+1];
187: register char *p, *t;
1.14 ! provos 188: int tries, pwd_tries;
1.5 provos 189: char salt[_PASSWORD_LEN], *crypt(), *getpass();
1.1 deraadt 190:
1.3 deraadt 191: printf("Changing YP password for %s.\n", pw->pw_name);
1.1 deraadt 192:
193: if (old_pass) {
194: *old_pass = NULL;
195:
196: if (pw->pw_passwd[0]) {
1.3 deraadt 197: p = getpass("Old password:");
198: if (strcmp(crypt(p, pw->pw_passwd), pw->pw_passwd)) {
199: errno = EACCES;
200: pw_error(NULL, 1, 1);
1.1 deraadt 201: }
1.3 deraadt 202: } else
1.1 deraadt 203: p = "";
204: *old_pass = strdup(p);
205: }
1.3 deraadt 206:
1.14 ! provos 207: pwd_tries = pwd_gettries(pw);
! 208:
1.1 deraadt 209: for (buf[0] = '\0', tries = 0;;) {
210: p = getpass("New password:");
211: if (!*p) {
1.3 deraadt 212: printf("Password unchanged.\n");
1.1 deraadt 213: pw_error(NULL, 0, 0);
1.10 deraadt 214: }
215: if (strcmp(p, "s/key") == 0) {
216: printf("That password collides with a system feature. Choose another.\n");
217: continue;
1.1 deraadt 218: }
1.14 ! provos 219: if ((tries++ < pwd_tries || pwd_tries == 0)
! 220: && pwd_check(pw, p) == 0)
1.1 deraadt 221: continue;
1.12 deraadt 222: strncpy(buf, p, sizeof buf-1);
223: buf[sizeof buf-1] = '\0';
1.1 deraadt 224: if (!strcmp(buf, getpass("Retype new password:")))
225: break;
226: (void)printf("Mismatch; try again, EOF to quit.\n");
227: }
1.6 provos 228: if( !pwd_gensalt( salt, _PASSWORD_LEN, pw, 'y' )) {
229: (void)printf("Couldn't generate salt.\n");
230: pw_error(NULL, 0, 0);
231: }
1.1 deraadt 232: return(strdup(crypt(buf, salt)));
233: }
234:
235: static char *
236: pwskip(register char *p)
237: {
238: while (*p && *p != ':' && *p != '\n')
239: ++p;
240: if (*p)
241: *p++ = 0;
242: return (p);
243: }
244:
245: struct passwd *
246: interpret(struct passwd *pwent, char *line)
247: {
248: register char *p = line;
249:
250: pwent->pw_passwd = "*";
251: pwent->pw_uid = 0;
252: pwent->pw_gid = 0;
253: pwent->pw_gecos = "";
254: pwent->pw_dir = "";
255: pwent->pw_shell = "";
256: pwent->pw_change = 0;
257: pwent->pw_expire = 0;
258: pwent->pw_class = "";
259:
260: /* line without colon separators is no good, so ignore it */
1.3 deraadt 261: if(!strchr(p, ':'))
1.1 deraadt 262: return(NULL);
263:
264: pwent->pw_name = p;
265: p = pwskip(p);
266: pwent->pw_passwd = p;
267: p = pwskip(p);
268: pwent->pw_uid = (uid_t)strtoul(p, NULL, 10);
269: p = pwskip(p);
270: pwent->pw_gid = (gid_t)strtoul(p, NULL, 10);
271: p = pwskip(p);
272: pwent->pw_gecos = p;
273: p = pwskip(p);
274: pwent->pw_dir = p;
275: p = pwskip(p);
276: pwent->pw_shell = p;
277: while (*p && *p != '\n')
278: p++;
279: *p = '\0';
280: return (pwent);
281: }
282:
1.4 deraadt 283: static char *__yplin;
284:
1.1 deraadt 285: static struct passwd *
286: ypgetpwnam(nam)
287: char *nam;
288: {
289: static struct passwd pwent;
290: char *val;
291: int reason, vallen;
292:
293: reason = yp_match(domain, "passwd.byname", nam, strlen(nam),
1.3 deraadt 294: &val, &vallen);
1.1 deraadt 295: switch(reason) {
296: case 0:
297: break;
298: default:
299: return (NULL);
300: break;
301: }
302: val[vallen] = '\0';
1.4 deraadt 303: if (__yplin)
304: free(__yplin);
305: __yplin = (char *)malloc(vallen + 1);
1.12 deraadt 306: strncpy(__yplin, val, vallen);
307: __yplin[vallen] = '\0';
1.1 deraadt 308: free(val);
309:
1.4 deraadt 310: return(interpret(&pwent, __yplin));
1.1 deraadt 311: }
312:
313: #endif /* YP */
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