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/* $OpenBSD: passwd.c,v 1.56 2019/06/28 13:32:43 deraadt Exp $ */
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/*
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* Copyright (c) 1987, 1993, 1994, 1995
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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/types.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/wait.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <pwd.h>
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#include <err.h>
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#include <errno.h>
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#include <paths.h>
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#include <signal.h>
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#include <limits.h>
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#include "util.h"
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static char pw_defdir[] = "/etc";
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static char *pw_dir = pw_defdir;
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static char *pw_lck;
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char *
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pw_file(const char *nm)
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{
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const char *p = strrchr(nm, '/');
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char *new_nm;
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if (p)
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p++;
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else
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p = nm;
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if (asprintf(&new_nm, "%s/%s", pw_dir, p) == -1)
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return NULL;
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return new_nm;
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}
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void
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pw_setdir(const char *dir)
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{
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char *p;
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if (strcmp (dir, pw_dir) == 0)
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return;
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if (pw_dir != pw_defdir)
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free(pw_dir);
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pw_dir = strdup(dir);
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if (pw_lck) {
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p = pw_file(pw_lck);
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free(pw_lck);
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pw_lck = p;
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}
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}
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int
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pw_lock(int retries)
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{
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int i, fd;
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mode_t old_mode;
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if (!pw_lck) {
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errno = EINVAL;
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return (-1);
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}
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/* Acquire the lock file. */
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old_mode = umask(0);
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fd = open(pw_lck, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0600);
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for (i = 0; i < retries && fd == -1 && errno == EEXIST; i++) {
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sleep(1);
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fd = open(pw_lck, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0600);
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}
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(void) umask(old_mode);
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return (fd);
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}
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int
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pw_mkdb(char *username, int flags)
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{
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int pstat, ac;
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pid_t pid;
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char *av[8];
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struct stat sb;
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if (pw_lck == NULL)
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return(-1);
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/* A zero length passwd file is never ok */
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if (stat(pw_lck, &sb) == 0 && sb.st_size == 0) {
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warnx("%s is zero length", pw_lck);
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return (-1);
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}
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ac = 0;
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av[ac++] = "pwd_mkdb";
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av[ac++] = "-d";
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av[ac++] = pw_dir;
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if (flags & _PASSWORD_SECUREONLY)
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av[ac++] = "-s";
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else if (!(flags & _PASSWORD_OMITV7))
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av[ac++] = "-p";
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if (username) {
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av[ac++] = "-u";
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av[ac++] = username;
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}
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av[ac++] = pw_lck;
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av[ac] = NULL;
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pid = vfork();
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if (pid == -1)
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return (-1);
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if (pid == 0) {
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if (pw_lck)
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execv(_PATH_PWD_MKDB, av);
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_exit(1);
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}
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pid = waitpid(pid, &pstat, 0);
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if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0)
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return (-1);
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return (0);
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}
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int
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pw_abort(void)
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{
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return (pw_lck ? unlink(pw_lck) : -1);
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}
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/* Everything below this point is intended for the convenience of programs
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* which allow a user to interactively edit the passwd file. Errors in the
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* routines below will cause the process to abort. */
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static pid_t editpid = -1;
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static void
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pw_cont(int signo)
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{
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int save_errno = errno;
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if (editpid != -1)
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kill(editpid, signo);
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errno = save_errno;
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}
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void
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pw_init(void)
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{
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struct rlimit rlim;
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/* Unlimited resource limits. */
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rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
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(void)setrlimit(RLIMIT_CPU, &rlim);
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(void)setrlimit(RLIMIT_FSIZE, &rlim);
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(void)setrlimit(RLIMIT_STACK, &rlim);
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(void)setrlimit(RLIMIT_DATA, &rlim);
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(void)setrlimit(RLIMIT_RSS, &rlim);
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/* Don't drop core (not really necessary, but GP's). */
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rlim.rlim_cur = rlim.rlim_max = 0;
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(void)setrlimit(RLIMIT_CORE, &rlim);
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/* Turn off signals. */
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(void)signal(SIGALRM, SIG_IGN);
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(void)signal(SIGHUP, SIG_IGN);
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(void)signal(SIGINT, SIG_IGN);
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(void)signal(SIGPIPE, SIG_IGN);
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(void)signal(SIGQUIT, SIG_IGN);
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(void)signal(SIGTERM, SIG_IGN);
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(void)signal(SIGCONT, pw_cont);
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if (!pw_lck)
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pw_lck = pw_file(_PATH_MASTERPASSWD_LOCK);
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}
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void
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pw_edit(int notsetuid, const char *filename)
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{
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int pstat;
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char *p;
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char *editor;
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char *argp[] = {"sh", "-c", NULL, NULL};
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if (!filename) {
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filename = pw_lck;
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if (!filename)
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return;
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}
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if ((editor = getenv("EDITOR")) == NULL)
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editor = _PATH_VI;
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if (asprintf(&p, "%s %s", editor, filename) == -1)
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return;
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argp[2] = p;
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switch (editpid = vfork()) {
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case -1: /* error */
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free(p);
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return;
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case 0: /* child */
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if (notsetuid) {
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setgid(getgid());
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setuid(getuid());
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}
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execv(_PATH_BSHELL, argp);
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_exit(127);
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}
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free(p);
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for (;;) {
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editpid = waitpid(editpid, (int *)&pstat, WUNTRACED);
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if (editpid == -1)
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pw_error(editor, 1, 1);
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else if (WIFSTOPPED(pstat))
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raise(WSTOPSIG(pstat));
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else if (WIFEXITED(pstat) && WEXITSTATUS(pstat) == 0)
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break;
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else
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pw_error(editor, 1, 1);
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}
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editpid = -1;
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}
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void
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pw_prompt(void)
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{
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int first, c;
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(void)printf("re-edit the password file? [y]: ");
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(void)fflush(stdout);
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first = c = getchar();
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while (c != '\n' && c != EOF)
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c = getchar();
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switch (first) {
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case EOF:
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putchar('\n');
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/* FALLTHROUGH */
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case 'n':
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case 'N':
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pw_error(NULL, 0, 0);
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break;
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}
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}
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static int
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pw_equal(const struct passwd *pw1, const struct passwd *pw2)
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{
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return (strcmp(pw1->pw_name, pw2->pw_name) == 0 &&
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pw1->pw_uid == pw2->pw_uid &&
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pw1->pw_gid == pw2->pw_gid &&
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strcmp(pw1->pw_class, pw2->pw_class) == 0 &&
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pw1->pw_change == pw2->pw_change &&
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pw1->pw_expire == pw2->pw_expire &&
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strcmp(pw1->pw_gecos, pw2->pw_gecos) == 0 &&
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strcmp(pw1->pw_dir, pw2->pw_dir) == 0 &&
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strcmp(pw1->pw_shell, pw2->pw_shell) == 0);
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}
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static int
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pw_write_entry(FILE *to, const struct passwd *pw)
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{
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char gidstr[16], uidstr[16];
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/* Preserve gid/uid -1 */
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if (pw->pw_gid == (gid_t)-1)
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strlcpy(gidstr, "-1", sizeof(gidstr));
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else
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snprintf(gidstr, sizeof(gidstr), "%u", (u_int)pw->pw_gid);
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if (pw->pw_uid == (uid_t)-1)
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strlcpy(uidstr, "-1", sizeof(uidstr));
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else
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snprintf(uidstr, sizeof(uidstr), "%u", (u_int)pw->pw_uid);
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return fprintf(to, "%s:%s:%s:%s:%s:%lld:%lld:%s:%s:%s\n",
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pw->pw_name, pw->pw_passwd, uidstr, gidstr, pw->pw_class,
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(long long)pw->pw_change, (long long)pw->pw_expire,
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pw->pw_gecos, pw->pw_dir, pw->pw_shell);
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}
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void
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pw_copy(int ffd, int tfd, const struct passwd *pw, const struct passwd *opw)
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{
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struct passwd tpw;
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FILE *from, *to;
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int done;
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char *p, *ep, buf[8192];
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char *master = pw_file(_PATH_MASTERPASSWD);
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if (!master)
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pw_error(NULL, 0, 1);
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if (!(from = fdopen(ffd, "r")))
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pw_error(master, 1, 1);
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if (!(to = fdopen(tfd, "w")))
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pw_error(pw_lck ? pw_lck : NULL, pw_lck ? 1 : 0, 1);
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for (done = 0; fgets(buf, (int)sizeof(buf), from);) {
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if ((ep = strchr(buf, '\n')) == NULL) {
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|
warnx("%s: line too long", master);
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pw_error(NULL, 0, 1);
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|
}
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if (done) {
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if (fputs(buf, to))
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goto fail;
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continue;
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|
}
|
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|
if (!(p = strchr(buf, ':'))) {
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|
warnx("%s: corrupted entry", master);
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|
pw_error(NULL, 0, 1);
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|
}
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|
*p = '\0';
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|
if (strcmp(buf, opw ? opw->pw_name : pw->pw_name)) {
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*p = ':';
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|
if (fputs(buf, to))
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|
goto fail;
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|
|
continue;
|
|
|
}
|
|
|
if (opw != NULL) {
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|
*p = ':';
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|
|
*ep = '\0';
|
|
|
if (!pw_scan(buf, &tpw, NULL))
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|
pw_error(NULL, 0, 1);
|
|
|
if (!pw_equal(&tpw, opw)) {
|
|
|
warnx("%s: inconsistent entry", master);
|
|
|
pw_error(NULL, 0, 1);
|
|
|
}
|
|
|
}
|
|
|
if (pw_write_entry(to, pw) == -1)
|
|
|
goto fail;
|
|
|
done = 1;
|
|
|
}
|
|
|
if (!done && pw_write_entry(to, pw) == -1)
|
|
|
goto fail;
|
|
|
|
|
|
if (ferror(to) || fflush(to))
|
|
|
fail:
|
|
|
pw_error(NULL, 0, 1);
|
|
|
free(master);
|
|
|
(void)fclose(to);
|
|
|
}
|
|
|
|
|
|
int
|
|
|
pw_scan(char *bp, struct passwd *pw, int *flags)
|
|
|
{
|
|
|
int root;
|
|
|
char *p, *sh;
|
|
|
const char *errstr;
|
|
|
|
|
|
if (flags != NULL)
|
|
|
*flags = 0;
|
|
|
|
|
|
if (!(p = strsep(&bp, ":")) || *p == '\0') /* login */
|
|
|
goto fmt;
|
|
|
pw->pw_name = p;
|
|
|
root = !strcmp(pw->pw_name, "root");
|
|
|
|
|
|
if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */
|
|
|
goto fmt;
|
|
|
|
|
|
if (!(p = strsep(&bp, ":"))) /* uid */
|
|
|
goto fmt;
|
|
|
pw->pw_uid = strtonum(p, -1, UID_MAX, &errstr);
|
|
|
if (errstr != NULL) {
|
|
|
if (*p != '\0') {
|
|
|
warnx("uid is %s", errstr);
|
|
|
return (0);
|
|
|
}
|
|
|
if (flags != NULL)
|
|
|
*flags |= _PASSWORD_NOUID;
|
|
|
}
|
|
|
if (root && pw->pw_uid) {
|
|
|
warnx("root uid should be 0");
|
|
|
return (0);
|
|
|
}
|
|
|
|
|
|
if (!(p = strsep(&bp, ":"))) /* gid */
|
|
|
goto fmt;
|
|
|
pw->pw_gid = strtonum(p, -1, GID_MAX, &errstr);
|
|
|
if (errstr != NULL) {
|
|
|
if (*p != '\0') {
|
|
|
warnx("gid is %s", errstr);
|
|
|
return (0);
|
|
|
}
|
|
|
if (flags != NULL)
|
|
|
*flags |= _PASSWORD_NOGID;
|
|
|
}
|
|
|
|
|
|
pw->pw_class = strsep(&bp, ":"); /* class */
|
|
|
if (!(p = strsep(&bp, ":"))) /* change */
|
|
|
goto fmt;
|
|
|
pw->pw_change = atoll(p);
|
|
|
if ((*p == '\0') && (flags != (int *)NULL))
|
|
|
*flags |= _PASSWORD_NOCHG;
|
|
|
if (!(p = strsep(&bp, ":"))) /* expire */
|
|
|
goto fmt;
|
|
|
pw->pw_expire = atoll(p);
|
|
|
if ((*p == '\0') && (flags != (int *)NULL))
|
|
|
*flags |= _PASSWORD_NOEXP;
|
|
|
pw->pw_gecos = strsep(&bp, ":"); /* gecos */
|
|
|
pw->pw_dir = strsep(&bp, ":"); /* directory */
|
|
|
if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */
|
|
|
goto fmt;
|
|
|
|
|
|
p = pw->pw_shell;
|
|
|
if (root && *p) { /* empty == /bin/sh */
|
|
|
for (setusershell();;) {
|
|
|
if (!(sh = getusershell())) {
|
|
|
warnx("warning, unknown root shell");
|
|
|
break;
|
|
|
}
|
|
|
if (!strcmp(p, sh))
|
|
|
break;
|
|
|
}
|
|
|
endusershell();
|
|
|
}
|
|
|
|
|
|
if ((p = strsep(&bp, ":"))) { /* too many */
|
|
|
fmt: warnx("corrupted entry");
|
|
|
return (0);
|
|
|
}
|
|
|
|
|
|
return (1);
|
|
|
}
|
|
|
|
|
|
__dead void
|
|
|
pw_error(const char *name, int error, int eval)
|
|
|
{
|
|
|
char *master = pw_file(_PATH_MASTERPASSWD);
|
|
|
|
|
|
if (error) {
|
|
|
if (name)
|
|
|
warn("%s", name);
|
|
|
else
|
|
|
warn(NULL);
|
|
|
}
|
|
|
if (master) {
|
|
|
warnx("%s: unchanged", master);
|
|
|
free(master);
|
|
|
}
|
|
|
|
|
|
pw_abort();
|
|
|
exit(eval);
|
|
|
}
|