Annotation of src/usr.bin/passwd/yp_passwd.c, Revision 1.19
1.19 ! millert 1: /* $OpenBSD: yp_passwd.c,v 1.18 2001/07/07 00:10:49 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
1.18 millert 36: /*static const char sccsid[] = "from: @(#)yp_passwd.c 1.0 2/2/93";*/
1.19 ! millert 37: static const char rcsid[] = "$OpenBSD: yp_passwd.c,v 1.18 2001/07/07 00:10:49 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>
1.17 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 *));
1.19 ! millert 67: extern void kbintr __P((int));
1.14 provos 68:
1.17 millert 69: char *ypgetnewpasswd __P((struct passwd *, login_cap_t *, char **));
1.15 millert 70: struct passwd *ypgetpwnam __P((char *));
1.1 deraadt 71:
72: char *domain;
73:
1.8 weingart 74: static int
1.1 deraadt 75: pw_error(name, err, eval)
76: char *name;
77: int err, eval;
78: {
1.15 millert 79: if (err)
1.13 millert 80: warn("%s", name);
1.1 deraadt 81:
1.8 weingart 82: warnx("YP passwd database unchanged.");
1.1 deraadt 83: exit(eval);
84: }
85:
1.8 weingart 86: int
1.1 deraadt 87: yp_passwd(username)
88: char *username;
89: {
90: char *master;
91: int r, rpcport, status;
1.15 millert 92: uid_t uid;
1.1 deraadt 93: struct yppasswd yppasswd;
94: struct passwd *pw;
95: struct timeval tv;
96: CLIENT *client;
1.17 millert 97: login_cap_t *lc;
1.1 deraadt 98:
99: /*
100: * Get local domain
101: */
1.8 weingart 102: if ((r = yp_get_default_domain(&domain)) != 0) {
103: warnx("can't get local YP domain. Reason: %s", yperr_string(r));
1.15 millert 104: return(1);
1.1 deraadt 105: }
106:
107: /*
108: * Find the host for the passwd map; it should be running
109: * the daemon.
110: */
111: if ((r = yp_master(domain, "passwd.byname", &master)) != 0) {
1.9 millert 112: warnx("can't find the master YP server. Reason: %s",
113: yperr_string(r));
1.15 millert 114: return(1);
1.1 deraadt 115: }
116:
117: /*
118: * Ask the portmapper for the port of the daemon.
119: */
120: if ((rpcport = getrpcport(master, YPPASSWDPROG,
121: YPPASSWDPROC_UPDATE, IPPROTO_UDP)) == 0) {
1.8 weingart 122: warnx("master YP server not running yppasswd daemon.");
123: warnx("Can't change password.");
1.15 millert 124: return(1);
1.1 deraadt 125: }
126:
127: /*
128: * Be sure the port is priviledged
129: */
130: if (rpcport >= IPPORT_RESERVED) {
1.8 weingart 131: warnx("yppasswd daemon is on an invalid port.");
1.15 millert 132: return(1);
1.1 deraadt 133: }
134:
135: /* Get user's login identity */
136: if (!(pw = ypgetpwnam(username))) {
1.8 weingart 137: warnx("unknown user %s.", username);
1.15 millert 138: return(1);
1.1 deraadt 139: }
1.17 millert 140: if ((lc = login_getclass(pw->pw_class)) == NULL) {
141: warnx("unable to get login class for user %s.", username);
142: return(1);
143: }
1.1 deraadt 144:
1.15 millert 145: uid = getuid();
1.1 deraadt 146: if (uid && uid != pw->pw_uid) {
1.8 weingart 147: warnx("you may only change your own password: %s", strerror(EACCES));
1.15 millert 148: return(1);
1.1 deraadt 149: }
150:
151: /* prompt for new password */
1.17 millert 152: yppasswd.newpw.pw_passwd = ypgetnewpasswd(pw, lc, &yppasswd.oldpass);
1.1 deraadt 153:
154: /* tell rpc.yppasswdd */
155: yppasswd.newpw.pw_name = pw->pw_name;
156: yppasswd.newpw.pw_uid = pw->pw_uid;
157: yppasswd.newpw.pw_gid = pw->pw_gid;
158: yppasswd.newpw.pw_gecos = pw->pw_gecos;
159: yppasswd.newpw.pw_dir = pw->pw_dir;
160: yppasswd.newpw.pw_shell = pw->pw_shell;
161:
162: client = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp");
163: if (client==NULL) {
1.9 millert 164: warnx("cannot contact yppasswdd on %s: Reason: %s",
1.1 deraadt 165: master, yperr_string(YPERR_YPBIND));
1.7 provos 166: free(yppasswd.newpw.pw_passwd);
1.1 deraadt 167: return(YPERR_YPBIND);
168: }
169: client->cl_auth = authunix_create_default();
170: tv.tv_sec = 2;
171: tv.tv_usec = 0;
172: r = clnt_call(client, YPPASSWDPROC_UPDATE,
1.3 deraadt 173: xdr_yppasswd, &yppasswd, xdr_int, &status, tv);
1.1 deraadt 174: if (r)
1.8 weingart 175: warnx("rpc to yppasswdd failed.");
1.3 deraadt 176: else if (status) {
1.1 deraadt 177: printf("Couldn't change YP password.\n");
1.7 provos 178: free(yppasswd.newpw.pw_passwd);
1.15 millert 179: return(1);
1.3 deraadt 180: }
181: printf("The YP password has been changed on %s, the master YP passwd server.\n",
182: master);
1.7 provos 183: free(yppasswd.newpw.pw_passwd);
1.15 millert 184: return(0);
1.1 deraadt 185: }
186:
1.15 millert 187: char *
1.17 millert 188: ypgetnewpasswd(pw, lc, old_pass)
1.15 millert 189: struct passwd *pw;
1.17 millert 190: login_cap_t *lc;
1.1 deraadt 191: char **old_pass;
192: {
193: static char buf[_PASSWORD_LEN+1];
1.15 millert 194: char *p;
1.14 provos 195: int tries, pwd_tries;
1.15 millert 196: char salt[_PASSWORD_LEN];
1.19 ! millert 197: sig_t saveint, savequit;
! 198:
! 199: saveint = signal(SIGINT, kbintr);
! 200: savequit = signal(SIGQUIT, kbintr);
1.1 deraadt 201:
1.3 deraadt 202: printf("Changing YP password for %s.\n", pw->pw_name);
1.1 deraadt 203: if (old_pass) {
204: *old_pass = NULL;
205:
206: if (pw->pw_passwd[0]) {
1.3 deraadt 207: p = getpass("Old password:");
208: if (strcmp(crypt(p, pw->pw_passwd), pw->pw_passwd)) {
209: errno = EACCES;
210: pw_error(NULL, 1, 1);
1.1 deraadt 211: }
1.3 deraadt 212: } else
1.1 deraadt 213: p = "";
214: *old_pass = strdup(p);
1.16 deraadt 215: if (*old_pass == NULL)
216: pw_error(NULL, 1, 1);
1.1 deraadt 217: }
1.3 deraadt 218:
1.17 millert 219: pwd_tries = pwd_gettries(pw, lc);
1.14 provos 220:
1.1 deraadt 221: for (buf[0] = '\0', tries = 0;;) {
222: p = getpass("New password:");
223: if (!*p) {
1.3 deraadt 224: printf("Password unchanged.\n");
1.1 deraadt 225: pw_error(NULL, 0, 0);
1.10 deraadt 226: }
227: if (strcmp(p, "s/key") == 0) {
228: printf("That password collides with a system feature. Choose another.\n");
229: continue;
1.1 deraadt 230: }
1.14 provos 231: if ((tries++ < pwd_tries || pwd_tries == 0)
1.17 millert 232: && pwd_check(pw, lc, p) == 0)
1.1 deraadt 233: continue;
1.12 deraadt 234: strncpy(buf, p, sizeof buf-1);
235: buf[sizeof buf-1] = '\0';
1.1 deraadt 236: if (!strcmp(buf, getpass("Retype new password:")))
237: break;
238: (void)printf("Mismatch; try again, EOF to quit.\n");
239: }
1.17 millert 240: if( !pwd_gensalt( salt, _PASSWORD_LEN, pw, lc, 'y' )) {
1.6 provos 241: (void)printf("Couldn't generate salt.\n");
242: pw_error(NULL, 0, 0);
243: }
1.16 deraadt 244: p = strdup(crypt(buf, salt));
245: if (p == NULL)
246: pw_error(NULL, 1, 1);
1.19 ! millert 247: (void)signal(SIGINT, saveint);
! 248: (void)signal(SIGQUIT, savequit);
! 249:
1.16 deraadt 250: return (p);
1.1 deraadt 251: }
252:
253: static char *
1.15 millert 254: pwskip(char *p)
1.1 deraadt 255: {
256: while (*p && *p != ':' && *p != '\n')
257: ++p;
258: if (*p)
259: *p++ = 0;
260: return (p);
261: }
262:
263: struct passwd *
264: interpret(struct passwd *pwent, char *line)
265: {
1.15 millert 266: char *p = line;
1.1 deraadt 267:
268: pwent->pw_passwd = "*";
269: pwent->pw_uid = 0;
270: pwent->pw_gid = 0;
271: pwent->pw_gecos = "";
272: pwent->pw_dir = "";
273: pwent->pw_shell = "";
274: pwent->pw_change = 0;
275: pwent->pw_expire = 0;
276: pwent->pw_class = "";
277:
278: /* line without colon separators is no good, so ignore it */
1.3 deraadt 279: if(!strchr(p, ':'))
1.1 deraadt 280: return(NULL);
281:
282: pwent->pw_name = p;
283: p = pwskip(p);
284: pwent->pw_passwd = p;
285: p = pwskip(p);
286: pwent->pw_uid = (uid_t)strtoul(p, NULL, 10);
287: p = pwskip(p);
288: pwent->pw_gid = (gid_t)strtoul(p, NULL, 10);
289: p = pwskip(p);
290: pwent->pw_gecos = p;
291: p = pwskip(p);
292: pwent->pw_dir = p;
293: p = pwskip(p);
294: pwent->pw_shell = p;
295: while (*p && *p != '\n')
296: p++;
297: *p = '\0';
298: return (pwent);
299: }
300:
1.4 deraadt 301: static char *__yplin;
302:
1.15 millert 303: struct passwd *
1.1 deraadt 304: ypgetpwnam(nam)
305: char *nam;
306: {
307: static struct passwd pwent;
308: char *val;
309: int reason, vallen;
310:
311: reason = yp_match(domain, "passwd.byname", nam, strlen(nam),
1.3 deraadt 312: &val, &vallen);
1.1 deraadt 313: switch(reason) {
314: case 0:
315: break;
316: default:
317: return (NULL);
318: break;
319: }
320: val[vallen] = '\0';
1.4 deraadt 321: if (__yplin)
322: free(__yplin);
323: __yplin = (char *)malloc(vallen + 1);
1.16 deraadt 324: if (__yplin == NULL)
325: pw_error(NULL, 1, 1);
1.12 deraadt 326: strncpy(__yplin, val, vallen);
327: __yplin[vallen] = '\0';
1.1 deraadt 328: free(val);
329:
1.4 deraadt 330: return(interpret(&pwent, __yplin));
1.1 deraadt 331: }
332:
333: #endif /* YP */
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