Annotation of src/usr.bin/passwd/yp_passwd.c, Revision 1.17
1.17 ! millert 1: /* $OpenBSD: yp_passwd.c,v 1.16 2001/01/10 20:11:30 deraadt 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";*/
1.17 ! millert 37: static char rcsid[] = "$OpenBSD: yp_passwd.c,v 1.16 2001/01/10 20:11:30 deraadt 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>
1.17 ! millert 52: #include <login_cap.h>
1.1 deraadt 53: #include <rpc/rpc.h>
54: #include <rpcsvc/yp_prot.h>
55: #include <rpcsvc/ypclnt.h>
56: #define passwd yp_passwd_rec
57: #include <rpcsvc/yppasswd.h>
58: #undef passwd
59:
60: #ifndef _PASSWORD_LEN
61: #define _PASSWORD_LEN PASS_MAX
62: #endif
63:
1.17 ! millert 64: extern int pwd_gensalt __P((char *, int, struct passwd *, login_cap_t *, char));
! 65: extern int pwd_check __P((struct passwd *, login_cap_t *, char *));
! 66: extern int pwd_gettries __P((struct passwd *, login_cap_t *));
1.14 provos 67:
1.17 ! millert 68: char *ypgetnewpasswd __P((struct passwd *, login_cap_t *, char **));
1.15 millert 69: struct passwd *ypgetpwnam __P((char *));
1.1 deraadt 70:
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: {
1.15 millert 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;
1.15 millert 91: uid_t uid;
1.1 deraadt 92: struct yppasswd yppasswd;
93: struct passwd *pw;
94: struct timeval tv;
95: CLIENT *client;
1.17 ! millert 96: login_cap_t *lc;
1.1 deraadt 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));
1.15 millert 103: return(1);
1.1 deraadt 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));
1.15 millert 113: return(1);
1.1 deraadt 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.");
1.15 millert 123: return(1);
1.1 deraadt 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.");
1.15 millert 131: return(1);
1.1 deraadt 132: }
133:
134: /* Get user's login identity */
135: if (!(pw = ypgetpwnam(username))) {
1.8 weingart 136: warnx("unknown user %s.", username);
1.15 millert 137: return(1);
1.1 deraadt 138: }
1.17 ! millert 139: if ((lc = login_getclass(pw->pw_class)) == NULL) {
! 140: warnx("unable to get login class for user %s.", username);
! 141: return(1);
! 142: }
1.1 deraadt 143:
1.15 millert 144: uid = getuid();
1.1 deraadt 145: if (uid && uid != pw->pw_uid) {
1.8 weingart 146: warnx("you may only change your own password: %s", strerror(EACCES));
1.15 millert 147: return(1);
1.1 deraadt 148: }
149:
150: /* prompt for new password */
1.17 ! millert 151: yppasswd.newpw.pw_passwd = ypgetnewpasswd(pw, lc, &yppasswd.oldpass);
1.1 deraadt 152:
153: /* tell rpc.yppasswdd */
154: yppasswd.newpw.pw_name = pw->pw_name;
155: yppasswd.newpw.pw_uid = pw->pw_uid;
156: yppasswd.newpw.pw_gid = pw->pw_gid;
157: yppasswd.newpw.pw_gecos = pw->pw_gecos;
158: yppasswd.newpw.pw_dir = pw->pw_dir;
159: yppasswd.newpw.pw_shell = pw->pw_shell;
160:
161: client = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp");
162: if (client==NULL) {
1.9 millert 163: warnx("cannot contact yppasswdd on %s: Reason: %s",
1.1 deraadt 164: master, yperr_string(YPERR_YPBIND));
1.7 provos 165: free(yppasswd.newpw.pw_passwd);
1.1 deraadt 166: return(YPERR_YPBIND);
167: }
168: client->cl_auth = authunix_create_default();
169: tv.tv_sec = 2;
170: tv.tv_usec = 0;
171: r = clnt_call(client, YPPASSWDPROC_UPDATE,
1.3 deraadt 172: xdr_yppasswd, &yppasswd, xdr_int, &status, tv);
1.1 deraadt 173: if (r)
1.8 weingart 174: warnx("rpc to yppasswdd failed.");
1.3 deraadt 175: else if (status) {
1.1 deraadt 176: printf("Couldn't change YP password.\n");
1.7 provos 177: free(yppasswd.newpw.pw_passwd);
1.15 millert 178: return(1);
1.3 deraadt 179: }
180: printf("The YP password has been changed on %s, the master YP passwd server.\n",
181: master);
1.7 provos 182: free(yppasswd.newpw.pw_passwd);
1.15 millert 183: return(0);
1.1 deraadt 184: }
185:
1.15 millert 186: char *
1.17 ! millert 187: ypgetnewpasswd(pw, lc, old_pass)
1.15 millert 188: struct passwd *pw;
1.17 ! millert 189: login_cap_t *lc;
1.1 deraadt 190: char **old_pass;
191: {
192: static char buf[_PASSWORD_LEN+1];
1.15 millert 193: char *p;
1.14 provos 194: int tries, pwd_tries;
1.15 millert 195: char salt[_PASSWORD_LEN];
1.1 deraadt 196:
1.3 deraadt 197: printf("Changing YP password for %s.\n", pw->pw_name);
1.1 deraadt 198: if (old_pass) {
199: *old_pass = NULL;
200:
201: if (pw->pw_passwd[0]) {
1.3 deraadt 202: p = getpass("Old password:");
203: if (strcmp(crypt(p, pw->pw_passwd), pw->pw_passwd)) {
204: errno = EACCES;
205: pw_error(NULL, 1, 1);
1.1 deraadt 206: }
1.3 deraadt 207: } else
1.1 deraadt 208: p = "";
209: *old_pass = strdup(p);
1.16 deraadt 210: if (*old_pass == NULL)
211: pw_error(NULL, 1, 1);
1.1 deraadt 212: }
1.3 deraadt 213:
1.17 ! millert 214: pwd_tries = pwd_gettries(pw, lc);
1.14 provos 215:
1.1 deraadt 216: for (buf[0] = '\0', tries = 0;;) {
217: p = getpass("New password:");
218: if (!*p) {
1.3 deraadt 219: printf("Password unchanged.\n");
1.1 deraadt 220: pw_error(NULL, 0, 0);
1.10 deraadt 221: }
222: if (strcmp(p, "s/key") == 0) {
223: printf("That password collides with a system feature. Choose another.\n");
224: continue;
1.1 deraadt 225: }
1.14 provos 226: if ((tries++ < pwd_tries || pwd_tries == 0)
1.17 ! millert 227: && pwd_check(pw, lc, p) == 0)
1.1 deraadt 228: continue;
1.12 deraadt 229: strncpy(buf, p, sizeof buf-1);
230: buf[sizeof buf-1] = '\0';
1.1 deraadt 231: if (!strcmp(buf, getpass("Retype new password:")))
232: break;
233: (void)printf("Mismatch; try again, EOF to quit.\n");
234: }
1.17 ! millert 235: if( !pwd_gensalt( salt, _PASSWORD_LEN, pw, lc, 'y' )) {
1.6 provos 236: (void)printf("Couldn't generate salt.\n");
237: pw_error(NULL, 0, 0);
238: }
1.16 deraadt 239: p = strdup(crypt(buf, salt));
240: if (p == NULL)
241: pw_error(NULL, 1, 1);
242: return (p);
1.1 deraadt 243: }
244:
245: static char *
1.15 millert 246: pwskip(char *p)
1.1 deraadt 247: {
248: while (*p && *p != ':' && *p != '\n')
249: ++p;
250: if (*p)
251: *p++ = 0;
252: return (p);
253: }
254:
255: struct passwd *
256: interpret(struct passwd *pwent, char *line)
257: {
1.15 millert 258: char *p = line;
1.1 deraadt 259:
260: pwent->pw_passwd = "*";
261: pwent->pw_uid = 0;
262: pwent->pw_gid = 0;
263: pwent->pw_gecos = "";
264: pwent->pw_dir = "";
265: pwent->pw_shell = "";
266: pwent->pw_change = 0;
267: pwent->pw_expire = 0;
268: pwent->pw_class = "";
269:
270: /* line without colon separators is no good, so ignore it */
1.3 deraadt 271: if(!strchr(p, ':'))
1.1 deraadt 272: return(NULL);
273:
274: pwent->pw_name = p;
275: p = pwskip(p);
276: pwent->pw_passwd = p;
277: p = pwskip(p);
278: pwent->pw_uid = (uid_t)strtoul(p, NULL, 10);
279: p = pwskip(p);
280: pwent->pw_gid = (gid_t)strtoul(p, NULL, 10);
281: p = pwskip(p);
282: pwent->pw_gecos = p;
283: p = pwskip(p);
284: pwent->pw_dir = p;
285: p = pwskip(p);
286: pwent->pw_shell = p;
287: while (*p && *p != '\n')
288: p++;
289: *p = '\0';
290: return (pwent);
291: }
292:
1.4 deraadt 293: static char *__yplin;
294:
1.15 millert 295: struct passwd *
1.1 deraadt 296: ypgetpwnam(nam)
297: char *nam;
298: {
299: static struct passwd pwent;
300: char *val;
301: int reason, vallen;
302:
303: reason = yp_match(domain, "passwd.byname", nam, strlen(nam),
1.3 deraadt 304: &val, &vallen);
1.1 deraadt 305: switch(reason) {
306: case 0:
307: break;
308: default:
309: return (NULL);
310: break;
311: }
312: val[vallen] = '\0';
1.4 deraadt 313: if (__yplin)
314: free(__yplin);
315: __yplin = (char *)malloc(vallen + 1);
1.16 deraadt 316: if (__yplin == NULL)
317: pw_error(NULL, 1, 1);
1.12 deraadt 318: strncpy(__yplin, val, vallen);
319: __yplin[vallen] = '\0';
1.1 deraadt 320: free(val);
321:
1.4 deraadt 322: return(interpret(&pwent, __yplin));
1.1 deraadt 323: }
324:
325: #endif /* YP */
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