/* $NetBSD: chpass.c,v 1.31 2006/10/07 20:09:09 elad 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. 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. */ #include #ifndef lint __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 __RCSID("$NetBSD: chpass.c,v 1.31 2006/10/07 20:09:09 elad Exp $"); #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "chpass.h" #include "pathnames.h" static char tempname[] = "/tmp/pw.XXXXXX"; uid_t uid; int use_yp; void (*Pw_error)(const char *, int, int); #ifdef YP extern int _yp_check(char **); /* buried deep inside libc */ #endif void baduser(void); void cleanup(void); void usage(void); int main(int argc, char **argv) { enum { NEWSH, LOADENTRY, EDITENTRY } op; struct passwd *pw, lpw, old_pw; int ch, dfd, pfd, tfd; #ifdef YP int yflag = 0; #endif char *arg, *username = NULL; #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 { warnx("master YP server not running yppasswd" " daemon."); errx(1, "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) { pw = getpwnam(username); if (pw == NULL) errx(1, "unknown user: %s", username); if (uid && uid != pw->pw_uid) baduser(); } else { pw = getpwuid(uid); if (pw == NULL) errx(1, "unknown user: uid %u", uid); } /* Make a copy for later verification */ old_pw = *pw; old_pw.pw_gecos = strdup(old_pw.pw_gecos); if (!old_pw.pw_gecos) { err(1, "strdup"); /*NOTREACHED*/ } } if (op == NEWSH) { /* protect p_shell -- it thinks NULL is /bin/sh */ if (!arg[0]) usage(); if (p_shell(arg, pw, NULL)) (*Pw_error)(NULL, 0, 1); } if (op == LOADENTRY) { if (uid) baduser(); pw = &lpw; if (!pw_scan(arg, pw, NULL)) exit(1); } /* Edit the user passwd information if requested. */ if (op == EDITENTRY) { struct stat sb; dfd = mkstemp(tempname); if (dfd < 0 || fcntl(dfd, F_SETFD, 1) < 0) (*Pw_error)(tempname, 1, 1); if (atexit(cleanup)) { cleanup(); errx(1, "couldn't register cleanup"); } if (stat(dirname(tempname), &sb) == -1) err(1, "couldn't stat `%s'", dirname(tempname)); if (!(sb.st_mode & S_ISTXT)) errx(1, "temporary directory `%s' is not sticky", dirname(tempname)); display(tempname, dfd, pw); edit(tempname, pw); } #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) { if (errno != EEXIST) err(1, "%s", _PATH_MASTERPASSWD_LOCK); warnx("The passwd file is busy, waiting..."); tfd = pw_lock(10); if (tfd < 0) { if (errno != EEXIST) err(1, "%s", _PATH_MASTERPASSWD_LOCK); errx(1, "The passwd file is still busy, " "try again later."); } } if (fcntl(tfd, F_SETFD, 1) < 0) pw_error(_PATH_MASTERPASSWD_LOCK, 1, 1); pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0); if (pfd < 0 || fcntl(pfd, F_SETFD, 1) < 0) pw_error(_PATH_MASTERPASSWD, 1, 1); /* Copy the passwd file to the lock file, updating pw. */ pw_copy(pfd, tfd, pw, (op == LOADENTRY) ? NULL : &old_pw); /* Now finish the passwd file update. */ if (pw_mkdb(username, 0) < 0) pw_error(NULL, 0, 1); exit(0); } void baduser(void) { errx(1, "%s", strerror(EACCES)); } void usage(void) { (void)fprintf(stderr, "usage: %s [-a list] [-s shell] [-l] [user]\n" " %s [-a list] [-s shell] [-y] [user]\n", getprogname(), getprogname()); exit(1); } void cleanup(void) { (void)unlink(tempname); }