426 lines
10 KiB
C
426 lines
10 KiB
C
/* $NetBSD: passwd.c,v 1.11 1997/12/31 05:47:15 thorpej 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: passwd.c,v 1.11 1997/12/31 05:47:15 thorpej Exp $");
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#endif /* LIBC_SCCS and not lint */
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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 <ctype.h>
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#include <err.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 <pwd.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 void pw_cont __P((int sig));
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static int pw_equal __P((char *buf, struct passwd *old_pw));
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int
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pw_lock(retries)
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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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/* Acquire the lock file. */
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old_mode = umask(0);
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fd = open(_PATH_MASTERPASSWD_LOCK, O_WRONLY|O_CREAT|O_EXCL, 0600);
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for (i = 0; i < retries && fd < 0 && errno == EEXIST; i++) {
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sleep(1);
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fd = open(_PATH_MASTERPASSWD_LOCK, O_WRONLY|O_CREAT|O_EXCL,
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0600);
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}
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umask(old_mode);
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return(fd);
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}
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int
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pw_mkdb()
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{
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int pstat;
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pid_t pid;
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pid = vfork();
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if (pid == 0) {
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execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p",
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_PATH_MASTERPASSWD_LOCK, NULL);
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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()
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{
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return(unlink(_PATH_MASTERPASSWD_LOCK));
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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(sig)
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int sig;
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{
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if (editpid != -1)
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kill(editpid, sig);
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}
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void
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pw_init()
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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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}
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void
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pw_edit(notsetuid, filename)
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int notsetuid;
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const char *filename;
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{
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int i, xargc, pstat;
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char *p, *editor;
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char **xargv;
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#ifdef __GNUC__
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(void) &editor;
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#endif
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if (filename == NULL)
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filename = _PATH_MASTERPASSWD_LOCK;
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if ((editor = getenv("EDITOR")) == NULL)
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editor = strdup(_PATH_VI);
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else
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editor = strdup(editor);
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if ((p = strrchr(editor, '/')))
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++p;
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else
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p = editor;
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/* Scan editor string, count spaces, allocate arg vector. */
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for (i = 0, xargc = 0; p[i] != '\0'; i++) {
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if (isspace(p[i])) {
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while (isspace(p[i++]))
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/* skip white space */ ;
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if (p[i] == '\0')
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break;
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xargc++;
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}
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}
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/* argv[0] + <xargc args> + filename + NULL */
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xargv = (char **)malloc(sizeof(char *) * (xargc + 3));
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if (xargv == NULL)
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pw_error("malloc failed", 1, 1);
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i = 0;
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xargv[i++] = p;
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for (; *p != '\0'; p++) {
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if (isspace(*p)) {
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while(isspace(*p))
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*p++ = '\0'; /* blast whitespace */
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if (*p == '\0')
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break;
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xargv[i++] = p;
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}
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}
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xargv[i++] = (char *)filename;
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xargv[i] = NULL;
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if (!(editpid = vfork())) {
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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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execvp(editor, xargv);
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_exit(1);
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}
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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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free(editor);
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free(xargv);
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}
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void
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pw_prompt()
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{
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int c;
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(void)printf("re-edit the password file? [y]: ");
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(void)fflush(stdout);
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c = getchar();
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if (c != EOF && c != '\n')
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while (getchar() != '\n');
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if (c == 'n')
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pw_error(NULL, 0, 0);
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}
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/* for use in pw_copy(). Compare a pw entry to a pw struct. */
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static int
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pw_equal (buf, pw)
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char *buf;
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struct passwd *pw;
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{
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struct passwd buf_pw;
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int len = strlen (buf);
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if (buf[len-1] == '\n')
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buf[len-1] = '\0';
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if (!pw_scan(buf, &buf_pw, NULL))
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return 0;
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return !strcmp(pw->pw_name, buf_pw.pw_name)
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&& pw->pw_uid == buf_pw.pw_uid
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&& pw->pw_gid == buf_pw.pw_gid
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&& !strcmp(pw->pw_class, buf_pw.pw_class)
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&& (long)pw->pw_change == (long)buf_pw.pw_change
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&& (long)pw->pw_expire == (long)buf_pw.pw_expire
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&& !strcmp(pw->pw_gecos, buf_pw.pw_gecos)
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&& !strcmp(pw->pw_dir, buf_pw.pw_dir)
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&& !strcmp(pw->pw_shell, buf_pw.pw_shell);
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}
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void
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pw_copy(ffd, tfd, pw, old_pw)
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int ffd, tfd;
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struct passwd *pw, *old_pw;
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{
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FILE *from, *to;
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int done;
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char *p, buf[8192];
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if (!(from = fdopen(ffd, "r")))
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pw_error(_PATH_MASTERPASSWD, 1, 1);
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if (!(to = fdopen(tfd, "w")))
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pw_error(_PATH_MASTERPASSWD_LOCK, 1, 1);
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for (done = 0; fgets(buf, sizeof(buf), from);) {
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if (!strchr(buf, '\n')) {
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warnx("%s: line too long", _PATH_MASTERPASSWD);
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pw_error(NULL, 0, 1);
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}
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if (done) {
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(void)fprintf(to, "%s", buf);
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if (ferror(to))
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goto err;
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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", _PATH_MASTERPASSWD);
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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, pw->pw_name)) {
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*p = ':';
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(void)fprintf(to, "%s", buf);
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if (ferror(to))
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goto err;
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continue;
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}
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*p = ':';
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if (old_pw && !pw_equal(buf, old_pw)) {
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warnx("%s: entry inconsistent",
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_PATH_MASTERPASSWD);
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pw_error(NULL, 0, 1);
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}
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(void)fprintf(to, "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n",
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pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid,
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pw->pw_class, (long)pw->pw_change, (long)pw->pw_expire,
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pw->pw_gecos, pw->pw_dir, pw->pw_shell);
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done = 1;
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if (ferror(to))
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goto err;
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}
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/* Only append a new entry if real uid is root! */
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if (!done)
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if (getuid() == 0)
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(void)fprintf(to, "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n",
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pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid,
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pw->pw_class, (long)pw->pw_change,
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(long)pw->pw_expire, pw->pw_gecos, pw->pw_dir,
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pw->pw_shell);
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else
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warnx("%s: changes not made, no such entry",
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_PATH_MASTERPASSWD);
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if (ferror(to))
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err: pw_error(NULL, 1, 1);
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(void)fclose(to);
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}
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int
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pw_scan(bp, pw, flags)
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char *bp;
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struct passwd *pw;
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int *flags;
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{
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unsigned long id;
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int root;
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char *p, *sh, *ep;
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if (flags != (int *)NULL)
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*flags = 0;
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if (!(pw->pw_name = strsep(&bp, ":"))) /* login */
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goto fmt;
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root = !strcmp(pw->pw_name, "root");
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if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */
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goto fmt;
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if (!(p = strsep(&bp, ":"))) /* uid */
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goto fmt;
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id = strtoul(p, &ep, 10);
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if (root && id) {
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warnx("root uid should be 0");
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return (0);
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}
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if (id > UID_MAX || *ep != '\0') {
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warnx("invalid uid '%s'", p);
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return (0);
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}
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pw->pw_uid = (uid_t)id;
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if ((*p == '\0') && (flags != (int *)NULL))
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*flags |= _PASSWORD_NOUID;
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if (!(p = strsep(&bp, ":"))) /* gid */
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goto fmt;
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id = strtoul(p, &ep, 10);
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if (id > GID_MAX || *ep != '\0') {
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warnx("invalid gid '%s'", p);
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return (0);
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}
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pw->pw_gid = (gid_t)id;
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if ((*p == '\0') && (flags != (int *)NULL))
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*flags |= _PASSWORD_NOGID;
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pw->pw_class = strsep(&bp, ":"); /* class */
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if (!(p = strsep(&bp, ":"))) /* change */
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goto fmt;
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pw->pw_change = atol(p);
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if ((*p == '\0') && (flags != (int *)NULL))
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*flags |= _PASSWORD_NOCHG;
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if (!(p = strsep(&bp, ":"))) /* expire */
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goto fmt;
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pw->pw_expire = atol(p);
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if ((*p == '\0') && (flags != (int *)NULL))
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*flags |= _PASSWORD_NOEXP;
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pw->pw_gecos = strsep(&bp, ":"); /* gecos */
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pw->pw_dir = strsep(&bp, ":"); /* directory */
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if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */
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goto fmt;
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p = pw->pw_shell;
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if (root && *p) /* empty == /bin/sh */
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for (setusershell();;) {
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if (!(sh = getusershell())) {
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warnx("warning, unknown root shell");
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break;
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}
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if (!strcmp(p, sh))
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break;
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}
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if ((p = strsep(&bp, ":"))) { /* too many */
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fmt: warnx("corrupted entry");
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return (0);
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}
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return (1);
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}
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void
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pw_error(name, err, eval)
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const char *name;
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int err, eval;
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{
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if (err)
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warn(name);
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warnx("%s: unchanged", _PATH_MASTERPASSWD);
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pw_abort();
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exit(eval);
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}
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