468 lines
11 KiB
C
468 lines
11 KiB
C
/* $NetBSD: yp_passwd.c,v 1.37 2012/03/25 05:55:07 dholland Exp $ */
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/*
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* Copyright (c) 1988, 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "from: @(#)local_passwd.c 8.3 (Berkeley) 4/2/94";
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#else
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__RCSID("$NetBSD: yp_passwd.c,v 1.37 2012/03/25 05:55:07 dholland Exp $");
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#endif
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#endif /* not lint */
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#ifdef YP
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <limits.h>
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#include <util.h>
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#include <rpc/rpc.h>
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#include <rpcsvc/yp_prot.h>
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#include <rpcsvc/ypclnt.h>
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#include "extern.h"
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#define passwd yp_passwd_rec
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#include <rpcsvc/yppasswd.h>
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#undef passwd
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#ifndef _PASSWORD_LEN
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#define _PASSWORD_LEN PASS_MAX
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#endif
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static uid_t uid;
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static char *domain;
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__dead static void
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pwerror(const char *name, int show_err, int eval)
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{
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if (show_err)
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warn("%s", name);
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errx(eval, "NIS passwd database unchanged");
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}
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static char *
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getnewpasswd(struct passwd *pw, char **old_pass)
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{
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int tries;
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const char *p, *t;
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char *result;
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static char buf[_PASSWORD_LEN + 1];
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char salt[_PASSWORD_LEN + 1];
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char option[LINE_MAX], *key, *opt;
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(void)printf("Changing NIS password for %s.\n", pw->pw_name);
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if (old_pass) {
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*old_pass = NULL;
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if (pw->pw_passwd[0]) {
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if (strcmp(crypt(p = getpass("Old password:"),
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pw->pw_passwd), pw->pw_passwd)) {
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(void)printf("Sorry.\n");
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pwerror(NULL, 0, 1);
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}
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} else {
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p = "";
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}
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*old_pass = strdup(p);
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if (!*old_pass) {
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(void)printf("not enough core.\n");
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pwerror(NULL, 0, 1);
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}
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}
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for (buf[0] = '\0', tries = 0;;) {
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p = getpass("New password:");
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if (!*p) {
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(void)printf("Password unchanged.\n");
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pwerror(NULL, 0, 0);
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}
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if (strlen(p) <= 5 && ++tries < 2) {
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(void)printf("Please enter a longer password.\n");
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continue;
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}
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for (t = p; *t && islower((unsigned char)*t); ++t);
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if (!*t && ++tries < 2) {
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(void)printf("Please don't use an all-lower case "
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"password.\nUnusual capitalization, "
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"control characters or digits are "
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"suggested.\n");
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continue;
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}
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(void)strlcpy(buf, p, sizeof(buf));
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if (!strcmp(buf, getpass("Retype new password:")))
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break;
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(void)printf("Mismatch; try again, EOF to quit.\n");
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}
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pw_getpwconf(option, sizeof(option), pw, "ypcipher");
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opt = option;
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key = strsep(&opt, ",");
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if (pw_gensalt(salt, _PASSWORD_LEN, key, opt) == -1) {
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warn("Couldn't generate salt");
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pwerror(NULL, 0, 0);
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}
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result = strdup(crypt(buf, salt));
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if (!result) {
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(void)printf("not enough core.\n");
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pwerror(NULL, 0, 0);
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}
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return result;
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}
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static void
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makeypp(struct yppasswd *ypp, struct passwd *pw)
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{
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/* prompt for new password */
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ypp->newpw.pw_passwd = getnewpasswd(pw, &ypp->oldpass);
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/* tell rpc.yppasswdd */
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ypp->newpw.pw_name = estrdup(pw->pw_name);
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ypp->newpw.pw_uid = pw->pw_uid;
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ypp->newpw.pw_gid = pw->pw_gid;
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ypp->newpw.pw_gecos = estrdup(pw->pw_gecos);
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ypp->newpw.pw_dir = estrdup(pw->pw_dir);
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ypp->newpw.pw_shell = estrdup(pw->pw_shell);
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}
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static int
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ypgetpwnam(const char *nam, struct passwd *pwd)
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{
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char *val;
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int reason, vallen, namlen = (int)strlen(nam);
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int flags;
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int ok;
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flags = ok = 0;
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val = NULL;
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reason = yp_match(domain, "master.passwd.byname", nam, namlen,
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&val, &vallen);
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if (reason == YPERR_MAP) {
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reason = yp_match(domain, "passwd.byname", nam, namlen,
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&val, &vallen);
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flags = _PASSWORD_OLDFMT;
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}
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if (reason != 0)
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goto out;
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if (pw_scan(val, pwd, &flags) == 0)
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goto out;
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ok = 1;
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val = NULL; /* Don't free the memory, it is still in use */
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out:
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if (val)
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free(val);
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return ok;
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}
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#ifdef USE_PAM
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void
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pwyp_usage(const char *prefix)
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{
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(void)fprintf(stderr, "%s %s [-d nis | -y] [user]\n",
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prefix, getprogname());
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}
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void
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pwyp_argv0_usage(const char *prefix)
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{
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(void)fprintf(stderr, "%s %s [user]\n",
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prefix, getprogname());
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}
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void
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pwyp_process(const char *username, int argc, char **argv)
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{
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char *master;
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int ch, r, rpcport, status;
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enum clnt_stat yr;
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struct yppasswd ypp;
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struct passwd pwb, pwb2, *pw;
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char pwbuf[1024];
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struct timeval tv;
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CLIENT *client;
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while ((ch = getopt(argc, argv, "y")) != -1) {
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switch (ch) {
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case 'y':
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/*
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* Abosrb the -y that may have gotten us here.
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*/
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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}
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argc -= optind;
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argv += optind;
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switch (argc) {
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case 0:
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/* username already provided */
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break;
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case 1:
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username = argv[0];
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break;
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default:
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usage();
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/*NOTREACHED*/
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}
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if (_yp_check(NULL) == 0) {
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/* can't use YP. */
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errx(EXIT_FAILURE, "NIS not in use.");
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}
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uid = getuid();
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/*
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* Get local domain
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*/
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if ((r = yp_get_default_domain(&domain)) != 0)
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errx(EXIT_FAILURE, "Can't get local NIS domain (%s)",
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yperr_string(r));
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/*
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* Find the host for the passwd map; it should be running
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* the daemon.
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*/
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if ((r = yp_master(domain, "passwd.byname", &master)) != 0)
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errx(EXIT_FAILURE, "Can't find the master NIS server (%s)",
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yperr_string(r));
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/*
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* Ask the portmapper for the port of the daemon.
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*/
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if ((rpcport = getrpcport(master, YPPASSWDPROG,
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YPPASSWDPROC_UPDATE, IPPROTO_UDP)) == 0)
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errx(EXIT_FAILURE, "Master NIS server not running yppasswd "
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"daemon");
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/*
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* Be sure the port is privileged
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*/
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if (rpcport >= IPPORT_RESERVED)
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errx(EXIT_FAILURE, "Yppasswd daemon is on an invalid port");
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/* Bail out if this is a local (non-yp) user, */
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/* then get user's login identity */
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if (!ypgetpwnam(username, &pwb) ||
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getpwnam_r(username, &pwb2, pwbuf, sizeof(pwbuf), &pw) ||
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pw == NULL)
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errx(EXIT_FAILURE, "NIS unknown user %s", username);
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if (uid && uid != pwb.pw_uid) {
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errno = EACCES;
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err(EXIT_FAILURE, "You may only change your own password");
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}
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makeypp(&ypp, &pwb);
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client = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp");
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if (client == NULL)
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errx(EXIT_FAILURE, "Cannot contact yppasswdd on %s (%s)",
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master, yperr_string(YPERR_YPBIND));
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client->cl_auth = authunix_create_default();
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tv.tv_sec = 2;
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tv.tv_usec = 0;
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yr = clnt_call(client, YPPASSWDPROC_UPDATE,
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xdr_yppasswd, &ypp, xdr_int, &status, tv);
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if (yr != RPC_SUCCESS)
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errx(EXIT_FAILURE, "RPC to yppasswdd failed (%s)",
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clnt_sperrno(yr));
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else if (status)
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printf("Couldn't change NIS password.\n");
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else
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printf("The NIS password has been changed on %s, %s\n",
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master, "the master NIS passwd server.");
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}
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#else /* ! USE_PAM */
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static int yflag;
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int
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yp_init(const char *progname)
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{
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int yppwd;
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if (strcmp(progname, "yppasswd") == 0) {
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yppwd = 1;
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} else
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yppwd = 0;
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yflag = 0;
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if (_yp_check(NULL) == 0) {
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/* can't use YP. */
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if (yppwd)
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errx(EXIT_FAILURE, "NIS not in use");
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return -1;
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}
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return 0;
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}
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int
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yp_arg(char ch, const char *arg)
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{
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switch (ch) {
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case 'y':
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yflag = 1;
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break;
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default:
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return 0;
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}
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return 1;
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}
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int
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yp_arg_end(void)
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{
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if (yflag)
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return PW_USE_FORCE;
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return PW_USE;
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}
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void
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yp_end(void)
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{
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/* NOOP */
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}
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int
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yp_chpw(const char *username)
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{
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char *master;
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int r, rpcport, status;
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enum clnt_stat yr;
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struct yppasswd ypp;
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struct passwd *pw, pwb;
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char pwbuf[1024];
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struct timeval tv;
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CLIENT *client;
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uid = getuid();
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/*
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* Get local domain
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*/
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if ((r = yp_get_default_domain(&domain)) != 0)
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errx(EXIT_FAILURE, "can't get local NIS domain. Reason: %s",
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yperr_string(r));
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/*
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* Find the host for the passwd map; it should be running
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* the daemon.
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*/
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if ((r = yp_master(domain, "passwd.byname", &master)) != 0) {
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warnx("can't find the master NIS server. Reason: %s",
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yperr_string(r));
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/* continuation */
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return -1;
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}
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/*
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* Ask the portmapper for the port of the daemon.
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*/
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if ((rpcport = getrpcport(master, YPPASSWDPROG,
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YPPASSWDPROC_UPDATE, IPPROTO_UDP)) == 0) {
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warnx("Master NIS server not running yppasswd daemon");
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/* continuation */
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return -1;
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}
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/*
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* Be sure the port is privileged
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*/
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if (rpcport >= IPPORT_RESERVED)
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errx(EXIT_FAILURE, "Yppasswd daemon is on an invalid port");
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/* Bail out if this is a local (non-yp) user, */
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/* then get user's login identity */
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if (!ypgetpwnam(username, pw = &pwb) ||
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getpwnam_r(username, &pwb, pwbuf, sizeof(pwbuf), &pw) ||
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pw == NULL) {
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warnx("NIS unknown user %s", username);
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/* continuation */
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return -1;
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}
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if (uid && uid != pw->pw_uid) {
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errno = EACCES;
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err(EXIT_FAILURE, "You may only change your own password");
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}
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makeypp(&ypp, pw);
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client = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp");
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if (client == NULL) {
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warnx("Cannot contact yppasswdd on %s (%s)",
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master, yperr_string(YPERR_YPBIND));
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return YPERR_YPBIND;
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}
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client->cl_auth = authunix_create_default();
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tv.tv_sec = 2;
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tv.tv_usec = 0;
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yr = clnt_call(client, YPPASSWDPROC_UPDATE,
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xdr_yppasswd, &ypp, xdr_int, &status, tv);
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if (yr != RPC_SUCCESS)
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errx(EXIT_FAILURE, "RPC to yppasswdd failed (%s)",
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clnt_sperrno(yr));
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else if (status)
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printf("Couldn't change NIS password.\n");
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else
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printf("The NIS password has been changed on %s, %s\n",
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master, "the master NIS passwd server.");
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return 0;
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}
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#endif /* USE_PAM */
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#endif /* YP */
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