Annotation of src/usr.bin/passwd/yp_passwd.c, Revision 1.21
1.21 ! fgsch 1: /* $OpenBSD: yp_passwd.c,v 1.20 2002/02/16 21:27:50 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";*/
1.21 ! fgsch 37: static const char rcsid[] = "$OpenBSD: yp_passwd.c,v 1.20 2002/02/16 21:27:50 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:
1.21 ! fgsch 64: extern int pwd_gensalt(char *, int, struct passwd *, login_cap_t *, char);
! 65: extern int pwd_check(struct passwd *, login_cap_t *, char *);
! 66: extern int pwd_gettries(struct passwd *, login_cap_t *);
! 67: extern void kbintr(int);
1.14 provos 68:
1.21 ! fgsch 69: char *ypgetnewpasswd(struct passwd *, login_cap_t *, char **);
! 70: struct passwd *ypgetpwnam(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: {
1.21 ! fgsch 79: if (err) {
! 80: if (name)
! 81: warn("%s", name);
! 82: else
! 83: warn(NULL);
! 84: }
1.1 deraadt 85:
1.21 ! fgsch 86: warnx("YP passwd database: unchanged.");
1.1 deraadt 87: exit(eval);
88: }
89:
1.8 weingart 90: int
1.1 deraadt 91: yp_passwd(username)
92: char *username;
93: {
94: char *master;
95: int r, rpcport, status;
1.15 millert 96: uid_t uid;
1.1 deraadt 97: struct yppasswd yppasswd;
98: struct passwd *pw;
99: struct timeval tv;
100: CLIENT *client;
1.17 millert 101: login_cap_t *lc;
1.1 deraadt 102:
103: /*
104: * Get local domain
105: */
1.8 weingart 106: if ((r = yp_get_default_domain(&domain)) != 0) {
1.21 ! fgsch 107: warnx("can't get local YP domain. Reason: %s",
! 108: yperr_string(r));
! 109: return (1);
1.1 deraadt 110: }
111:
112: /*
113: * Find the host for the passwd map; it should be running
114: * the daemon.
115: */
116: if ((r = yp_master(domain, "passwd.byname", &master)) != 0) {
1.9 millert 117: warnx("can't find the master YP server. Reason: %s",
118: yperr_string(r));
1.21 ! fgsch 119: return (1);
1.1 deraadt 120: }
121:
122: /*
123: * Ask the portmapper for the port of the daemon.
124: */
125: if ((rpcport = getrpcport(master, YPPASSWDPROG,
126: YPPASSWDPROC_UPDATE, IPPROTO_UDP)) == 0) {
1.8 weingart 127: warnx("master YP server not running yppasswd daemon.");
128: warnx("Can't change password.");
1.21 ! fgsch 129: return (1);
1.1 deraadt 130: }
131:
132: /*
133: * Be sure the port is priviledged
134: */
135: if (rpcport >= IPPORT_RESERVED) {
1.8 weingart 136: warnx("yppasswd daemon is on an invalid port.");
1.21 ! fgsch 137: return (1);
1.1 deraadt 138: }
139:
140: /* Get user's login identity */
141: if (!(pw = ypgetpwnam(username))) {
1.8 weingart 142: warnx("unknown user %s.", username);
1.21 ! fgsch 143: return (1);
1.1 deraadt 144: }
1.17 millert 145: if ((lc = login_getclass(pw->pw_class)) == NULL) {
146: warnx("unable to get login class for user %s.", username);
1.21 ! fgsch 147: return (1);
1.17 millert 148: }
1.21 ! fgsch 149:
1.15 millert 150: uid = getuid();
1.1 deraadt 151: if (uid && uid != pw->pw_uid) {
1.21 ! fgsch 152: warnx("you may only change your own password: %s",
! 153: strerror(EACCES));
! 154: return (1);
1.1 deraadt 155: }
156:
157: /* prompt for new password */
1.17 millert 158: yppasswd.newpw.pw_passwd = ypgetnewpasswd(pw, lc, &yppasswd.oldpass);
1.1 deraadt 159:
160: /* tell rpc.yppasswdd */
161: yppasswd.newpw.pw_name = pw->pw_name;
162: yppasswd.newpw.pw_uid = pw->pw_uid;
163: yppasswd.newpw.pw_gid = pw->pw_gid;
164: yppasswd.newpw.pw_gecos = pw->pw_gecos;
165: yppasswd.newpw.pw_dir = pw->pw_dir;
166: yppasswd.newpw.pw_shell = pw->pw_shell;
1.21 ! fgsch 167:
1.1 deraadt 168: client = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp");
169: if (client==NULL) {
1.9 millert 170: warnx("cannot contact yppasswdd on %s: Reason: %s",
1.1 deraadt 171: master, yperr_string(YPERR_YPBIND));
1.7 provos 172: free(yppasswd.newpw.pw_passwd);
1.21 ! fgsch 173: return (YPERR_YPBIND);
1.1 deraadt 174: }
175: client->cl_auth = authunix_create_default();
176: tv.tv_sec = 2;
177: tv.tv_usec = 0;
178: r = clnt_call(client, YPPASSWDPROC_UPDATE,
1.3 deraadt 179: xdr_yppasswd, &yppasswd, xdr_int, &status, tv);
1.1 deraadt 180: if (r)
1.8 weingart 181: warnx("rpc to yppasswdd failed.");
1.3 deraadt 182: else if (status) {
1.1 deraadt 183: printf("Couldn't change YP password.\n");
1.7 provos 184: free(yppasswd.newpw.pw_passwd);
1.21 ! fgsch 185: return (1);
1.3 deraadt 186: }
1.21 ! fgsch 187: printf("The YP password has been changed on %s, "
! 188: "the master YP passwd server.\n", master);
1.7 provos 189: free(yppasswd.newpw.pw_passwd);
1.21 ! fgsch 190: return (0);
1.1 deraadt 191: }
192:
1.15 millert 193: char *
1.17 millert 194: ypgetnewpasswd(pw, lc, old_pass)
1.15 millert 195: struct passwd *pw;
1.17 millert 196: login_cap_t *lc;
1.1 deraadt 197: char **old_pass;
198: {
199: static char buf[_PASSWORD_LEN+1];
1.15 millert 200: char *p;
1.14 provos 201: int tries, pwd_tries;
1.15 millert 202: char salt[_PASSWORD_LEN];
1.19 millert 203: sig_t saveint, savequit;
204:
205: saveint = signal(SIGINT, kbintr);
206: savequit = signal(SIGQUIT, kbintr);
1.21 ! fgsch 207:
1.3 deraadt 208: printf("Changing YP password for %s.\n", pw->pw_name);
1.1 deraadt 209: if (old_pass) {
210: *old_pass = NULL;
1.21 ! fgsch 211:
1.1 deraadt 212: if (pw->pw_passwd[0]) {
1.3 deraadt 213: p = getpass("Old password:");
214: if (strcmp(crypt(p, pw->pw_passwd), pw->pw_passwd)) {
215: errno = EACCES;
216: pw_error(NULL, 1, 1);
1.1 deraadt 217: }
1.3 deraadt 218: } else
1.1 deraadt 219: p = "";
220: *old_pass = strdup(p);
1.16 deraadt 221: if (*old_pass == NULL)
222: pw_error(NULL, 1, 1);
1.1 deraadt 223: }
1.3 deraadt 224:
1.17 millert 225: pwd_tries = pwd_gettries(pw, lc);
1.14 provos 226:
1.1 deraadt 227: for (buf[0] = '\0', tries = 0;;) {
228: p = getpass("New password:");
229: if (!*p) {
1.3 deraadt 230: printf("Password unchanged.\n");
1.1 deraadt 231: pw_error(NULL, 0, 0);
1.10 deraadt 232: }
233: if (strcmp(p, "s/key") == 0) {
1.21 ! fgsch 234: printf("That password collides with a system feature. "
! 235: "Choose another.\n");
1.10 deraadt 236: continue;
1.1 deraadt 237: }
1.21 ! fgsch 238: if ((tries++ < pwd_tries || pwd_tries == 0)
1.17 millert 239: && pwd_check(pw, lc, p) == 0)
1.1 deraadt 240: continue;
1.12 deraadt 241: strncpy(buf, p, sizeof buf-1);
242: buf[sizeof buf-1] = '\0';
1.1 deraadt 243: if (!strcmp(buf, getpass("Retype new password:")))
244: break;
245: (void)printf("Mismatch; try again, EOF to quit.\n");
246: }
1.21 ! fgsch 247: if(!pwd_gensalt(salt, _PASSWORD_LEN, pw, lc, 'y')) {
! 248: (void)printf("Couldn't generate salt.\n");
! 249: pw_error(NULL, 0, 0);
! 250: }
1.16 deraadt 251: p = strdup(crypt(buf, salt));
252: if (p == NULL)
253: pw_error(NULL, 1, 1);
1.19 millert 254: (void)signal(SIGINT, saveint);
255: (void)signal(SIGQUIT, savequit);
256:
1.16 deraadt 257: return (p);
1.1 deraadt 258: }
259:
260: static char *
1.15 millert 261: pwskip(char *p)
1.1 deraadt 262: {
263: while (*p && *p != ':' && *p != '\n')
264: ++p;
265: if (*p)
266: *p++ = 0;
267: return (p);
268: }
269:
270: struct passwd *
271: interpret(struct passwd *pwent, char *line)
272: {
1.15 millert 273: char *p = line;
1.1 deraadt 274:
275: pwent->pw_passwd = "*";
276: pwent->pw_uid = 0;
277: pwent->pw_gid = 0;
278: pwent->pw_gecos = "";
279: pwent->pw_dir = "";
280: pwent->pw_shell = "";
281: pwent->pw_change = 0;
282: pwent->pw_expire = 0;
283: pwent->pw_class = "";
1.21 ! fgsch 284:
1.1 deraadt 285: /* line without colon separators is no good, so ignore it */
1.3 deraadt 286: if(!strchr(p, ':'))
1.21 ! fgsch 287: return (NULL);
1.1 deraadt 288:
289: pwent->pw_name = p;
290: p = pwskip(p);
291: pwent->pw_passwd = p;
292: p = pwskip(p);
293: pwent->pw_uid = (uid_t)strtoul(p, NULL, 10);
294: p = pwskip(p);
295: pwent->pw_gid = (gid_t)strtoul(p, NULL, 10);
296: p = pwskip(p);
297: pwent->pw_gecos = p;
298: p = pwskip(p);
299: pwent->pw_dir = p;
300: p = pwskip(p);
301: pwent->pw_shell = p;
302: while (*p && *p != '\n')
303: p++;
304: *p = '\0';
305: return (pwent);
306: }
307:
1.4 deraadt 308: static char *__yplin;
309:
1.15 millert 310: struct passwd *
1.1 deraadt 311: ypgetpwnam(nam)
312: char *nam;
313: {
314: static struct passwd pwent;
315: char *val;
316: int reason, vallen;
1.21 ! fgsch 317:
1.1 deraadt 318: reason = yp_match(domain, "passwd.byname", nam, strlen(nam),
1.3 deraadt 319: &val, &vallen);
1.1 deraadt 320: switch(reason) {
321: case 0:
322: break;
323: default:
324: return (NULL);
325: break;
326: }
327: val[vallen] = '\0';
1.4 deraadt 328: if (__yplin)
329: free(__yplin);
330: __yplin = (char *)malloc(vallen + 1);
1.16 deraadt 331: if (__yplin == NULL)
332: pw_error(NULL, 1, 1);
1.12 deraadt 333: strncpy(__yplin, val, vallen);
334: __yplin[vallen] = '\0';
1.1 deraadt 335: free(val);
336:
1.21 ! fgsch 337: return (interpret(&pwent, __yplin));
1.1 deraadt 338: }
339:
340: #endif /* YP */
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