/* $NetBSD: chpass.c,v 1.13 1997/07/25 06:40:32 mikel Exp $ */ /*- * Copyright (c) 1988, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static char copyright[] = "@(#) Copyright (c) 1988, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)chpass.c 8.4 (Berkeley) 4/2/94"; #else static char rcsid[] = "$NetBSD: chpass.c,v 1.13 1997/07/25 06:40:32 mikel Exp $"; #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "chpass.h" #include "pathnames.h" extern char *__progname; /* from crt0.o */ char *tempname; uid_t uid; int use_yp; int yflag; void (*Pw_error) __P((const char *, int, int)); #ifdef YP extern struct passwd *ypgetpwnam(), *ypgetpwuid(); extern int _yp_check __P((char **)); /* buried deep inside libc */ #endif void baduser __P((void)); void usage __P((void)); int main(argc, argv) int argc; char **argv; { enum { NEWSH, LOADENTRY, EDITENTRY } op; struct passwd *pw, lpw, old_pw; int ch, pfd, tfd, dfd; char *arg, *username = NULL, tempname[] = "/etc/pw.XXXXXX"; #ifdef __GNUC__ pw = NULL; /* XXX gcc -Wuninitialized */ arg = NULL; #endif #ifdef YP use_yp = _yp_check(NULL); #endif op = EDITENTRY; while ((ch = getopt(argc, argv, "a:s:ly")) != -1) switch(ch) { case 'a': op = LOADENTRY; arg = optarg; break; case 's': op = NEWSH; arg = optarg; break; case 'l': use_yp = 0; break; case 'y': #ifdef YP if (!use_yp) errx(1, "YP not in use."); yflag = 1; #else errx(1, "YP support not compiled in."); #endif break; default: usage(); } argc -= optind; argv += optind; uid = getuid(); switch (argc) { case 0: /* nothing */ break; case 1: username = argv[0]; break; default: usage(); } #ifdef YP /* * We need to determine if we _really_ want to use YP. * If we defaulted to YP (i.e. were not given the -y flag), * and the master is not running rpc.yppasswdd, we check * to see if the user exists in the local passwd database. * If so, we use it, otherwise we error out. */ if (use_yp && yflag == 0) { if (check_yppasswdd()) { /* * We weren't able to contact rpc.yppasswdd. * Check to see if we're in the local * password database. If we are, use it. */ if (username != NULL) pw = getpwnam(username); else pw = getpwuid(uid); if (pw != NULL) use_yp = 0; else { errx(1, "master YP server not running yppasswd daemon.\n\t%s\n", "Can't change password."); } } } #endif #ifdef YP if (use_yp) Pw_error = yppw_error; else #endif Pw_error = pw_error; #ifdef YP if (op == LOADENTRY && use_yp) errx(1, "cannot load entry using YP.\n\tUse the -l flag to load local."); #endif if (op == EDITENTRY || op == NEWSH) { if (username != NULL) { #ifdef YP if (use_yp) pw = ypgetpwnam(username); else #endif /* YP */ pw = getpwnam(username); if (pw == NULL) errx(1, "unknown user: %s", username); if (uid && uid != pw->pw_uid) baduser(); } else { #ifdef YP if (use_yp) pw = ypgetpwuid(uid); else #endif /* YP */ pw = getpwuid(uid); if (pw == NULL) errx(1, "unknown user: uid %u\n", uid); } } if (op == NEWSH) { /* protect p_shell -- it thinks NULL is /bin/sh */ if (!arg[0]) usage(); if (p_shell(arg, pw, (ENTRY *)NULL)) (*Pw_error)((char *)NULL, 0, 1); } if (op == LOADENTRY) { if (uid) baduser(); pw = &lpw; if (!pw_scan(arg, pw, (int *)NULL)) exit(1); } /* Make a copy for later verification */ old_pw = *pw; old_pw.pw_gecos = strdup(old_pw.pw_gecos); /* Edit the user passwd information if requested. */ if (op == EDITENTRY) { dfd = mkstemp(tempname); if (dfd < 0) { (*Pw_error)(tempname, 1, 1); } display(tempname, dfd, pw); edit(tempname, pw); (void)unlink(tempname); } #ifdef YP if (use_yp) { if (pw_yp(pw, uid)) yppw_error((char *)NULL, 0, 1); else exit(0); /* Will not exit from this if. */ } #endif /* YP */ /* * Get the passwd lock file and open the passwd file for * reading. */ pw_init(); tfd = pw_lock(0); if (tfd < 0) { warnx ("The passwd file is busy, waiting..."); tfd = pw_lock(10); if (tfd < 0) errx(1, "The passwd file is still busy, " "try again later."); } pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0); if (pfd < 0) pw_error(_PATH_MASTERPASSWD, 1, 1); /* Copy the passwd file to the lock file, updating pw. */ pw_copy(pfd, tfd, pw, &old_pw); /* Now finish the passwd file update. */ if (pw_mkdb() < 0) pw_error((char *)NULL, 0, 1); exit(0); } void baduser() { errx(1, "%s", strerror(EACCES)); } void usage() { #ifdef YP (void)fprintf(stderr, "usage: chpass [-a list] [-s shell] [-l]%s [user]\n", use_yp?" [-y]":""); #else (void)fprintf(stderr, "usage: chpass [-a list] [-s shell] [user]\n"); #endif exit(1); }