552 lines
12 KiB
C
552 lines
12 KiB
C
/* $NetBSD: passwd.c,v 1.31 2001/10/23 00:25:21 lukem 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 1.31 2001/10/23 00:25:21 lukem 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/param.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 <assert.h>
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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 <fcntl.h>
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#include <limits.h>
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#include <paths.h>
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#include <pwd.h>
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#include <signal.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 <unistd.h>
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#include <util.h>
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static const char *pw_filename(const char *filename);
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static void pw_cont(int sig);
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static int pw_equal(char *buf, struct passwd *old_pw);
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static const char *pw_default(const char *option);
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static int read_line(FILE *fp, char *line, int max);
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static void trim_whitespace(char *line);
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static char pw_prefix[MAXPATHLEN];
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const char *
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pw_getprefix(void)
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{
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return(pw_prefix);
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}
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int
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pw_setprefix(const char *new_prefix)
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{
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size_t length;
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_DIAGASSERT(new_prefix != NULL);
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length = strlen(new_prefix);
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if (length < sizeof(pw_prefix)) {
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(void)strcpy(pw_prefix, new_prefix);
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while (length > 0 && pw_prefix[length - 1] == '/')
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pw_prefix[--length] = '\0';
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return(0);
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}
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errno = ENAMETOOLONG;
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return(-1);
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}
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static const char *
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pw_filename(const char *filename)
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{
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static char newfilename[MAXPATHLEN];
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_DIAGASSERT(filename != NULL);
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if (pw_prefix[0] == '\0')
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return filename;
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if (strlen(pw_prefix) + strlen(filename) < sizeof(newfilename))
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return strcat(strcpy(newfilename, pw_prefix), filename);
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errno = ENAMETOOLONG;
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return(NULL);
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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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const char *filename;
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int i, fd;
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mode_t old_mode;
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int oerrno;
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/* Acquire the lock file. */
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filename = pw_filename(_PATH_MASTERPASSWD_LOCK);
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if (filename == NULL)
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return(-1);
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old_mode = umask(0);
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fd = open(filename, 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(filename, O_WRONLY|O_CREAT|O_EXCL,
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0600);
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}
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oerrno = errno;
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(void)umask(old_mode);
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errno = oerrno;
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return(fd);
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}
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int
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pw_mkdb(username, secureonly)
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const char *username;
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int secureonly;
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{
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const char *args[9];
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int pstat, i;
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pid_t pid;
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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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args[0] = "pwd_mkdb";
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args[1] = "-d";
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args[2] = pw_prefix;
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args[3] = "-p";
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i = 4;
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if (secureonly)
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args[i++] = "-s";
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if (username != NULL) {
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args[i++] = "-u";
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args[i++] = username;
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}
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args[i++] = pw_filename(_PATH_MASTERPASSWD_LOCK);
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args[i] = NULL;
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execv(_PATH_PWD_MKDB, (char * const *)args);
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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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const char *filename;
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filename = pw_filename(_PATH_MASTERPASSWD_LOCK);
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return((filename == NULL) ? -1 : unlink(filename));
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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 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(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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}
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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, *editor;
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char *argp[] = { "sh", "-c", NULL, NULL };
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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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filename = pw_filename(filename);
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if (filename == NULL)
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return;
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if ((editor = getenv("EDITOR")) == NULL)
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editor = _PATH_VI;
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p = malloc(strlen(editor) + 1 + strlen(filename) + 1);
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if (p == NULL)
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return;
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sprintf(p, "%s %s", editor, filename);
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argp[2] = p;
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switch(editpid = vfork()) {
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case -1:
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free(p);
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return;
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case 0:
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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(_PATH_BSHELL, argp);
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_exit(1);
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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 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(char *buf, struct passwd *pw)
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{
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struct passwd buf_pw;
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int len;
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_DIAGASSERT(buf != NULL);
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_DIAGASSERT(pw != NULL);
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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(int ffd, int tfd, struct passwd *pw, struct passwd *old_pw)
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{
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const char *filename;
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char mpwd[MAXPATHLEN], mpwdl[MAXPATHLEN], *p, buf[8192];
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FILE *from, *to;
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int done;
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_DIAGASSERT(pw != NULL);
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/* old_pw may be NULL */
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if ((filename = pw_filename(_PATH_MASTERPASSWD)) == NULL)
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pw_error(pw_prefix, 1,1);
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(void)strcpy(mpwd, filename);
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if ((filename = pw_filename(_PATH_MASTERPASSWD_LOCK)) == NULL)
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pw_error(pw_prefix, 1,1);
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(void)strcpy(mpwdl, filename);
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if (!(from = fdopen(ffd, "r")))
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pw_error(mpwd, 1, 1);
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if (!(to = fdopen(tfd, "w")))
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pw_error(mpwdl, 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", mpwd);
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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", mpwd);
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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", mpwd);
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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", mpwd);
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}
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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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void
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pw_error(const char *name, int err, int eval)
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{
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if (err) {
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if (name)
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warn("%s", name);
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else
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warn(NULL);
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}
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warnx("%s%s: unchanged", pw_prefix, _PATH_MASTERPASSWD);
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pw_abort();
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exit(eval);
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}
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/* Removes head and/or tail spaces. */
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static void
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trim_whitespace(char *line)
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{
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char *p;
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_DIAGASSERT(line != NULL);
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/* Remove leading spaces */
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p = line;
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while (isspace((unsigned char) *p))
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p++;
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memmove(line, p, strlen(p) + 1);
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/* Remove trailing spaces */
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p = line + strlen(line) - 1;
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while (isspace((unsigned char) *p))
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p--;
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*(p + 1) = '\0';
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}
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/* Get one line, remove spaces from front and tail */
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static int
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read_line(FILE *fp, char *line, int max)
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{
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char *p;
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_DIAGASSERT(fp != NULL);
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_DIAGASSERT(line != NULL);
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/* Read one line of config */
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if (fgets(line, max, fp) == NULL)
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return (0);
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if ((p = strchr(line, '\n')) == NULL) {
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warnx("line too long");
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return (0);
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}
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*p = '\0';
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/* Remove comments */
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if ((p = strchr(line, '#')) != NULL)
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*p = '\0';
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trim_whitespace(line);
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return (1);
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}
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static const char *
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pw_default(const char *option)
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{
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static const char *options[][2] = {
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{ "localcipher", "old" },
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{ "ypcipher", "old" },
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};
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int i;
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_DIAGASSERT(option != NULL);
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for (i = 0; i < sizeof(options) / sizeof(options[0]); i++)
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if (strcmp(options[i][0], option) == 0)
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return (options[i][1]);
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return (NULL);
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}
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/*
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* Retrieve password information from the /etc/passwd.conf file, at the
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* moment this is only for choosing the cipher to use. It could easily be
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* used for other authentication methods as well.
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*/
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void
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pw_getconf(char *data, size_t max, const char *key, const char *option)
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{
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FILE *fp;
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char line[LINE_MAX], *p, *p2;
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static char result[LINE_MAX];
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int got, found;
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const char *cp;
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_DIAGASSERT(data != NULL);
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_DIAGASSERT(key != NULL);
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_DIAGASSERT(option != NULL);
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got = 0;
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found = 0;
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result[0] = '\0';
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if ((fp = fopen(_PATH_PASSWD_CONF, "r")) == NULL) {
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if ((cp = pw_default(option)) != NULL)
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strlcpy(data, cp, max);
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else
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data[0] = '\0';
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return;
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}
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while (!found && (got || read_line(fp, line, LINE_MAX))) {
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got = 0;
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if (strncmp(key, line, strlen(key)) != 0 ||
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line[strlen(key)] != ':')
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continue;
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/* Now we found our specified key */
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while (read_line(fp, line, LINE_MAX)) {
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/* Leaving key field */
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if (line[0] != '\0' && strchr(line + 1, ':') != NULL) {
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got = 1;
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break;
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}
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p2 = line;
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if ((p = strsep(&p2, "=")) == NULL || p2 == NULL)
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continue;
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trim_whitespace(p);
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if (!strncmp(p, option, strlen(option))) {
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trim_whitespace(p2);
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strcpy(result, p2);
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found = 1;
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break;
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}
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}
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}
|
|
fclose(fp);
|
|
|
|
/*
|
|
* If we got no result and were looking for a default
|
|
* value, try hard coded defaults.
|
|
*/
|
|
|
|
if (strlen(result) == 0 && strcmp(key, "default") == 0 &&
|
|
(cp = pw_default(option)) != NULL)
|
|
strlcpy(data, cp, max);
|
|
else
|
|
strlcpy(data, result, max);
|
|
}
|