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/* $OpenBSD: passwd.c,v 1.43 2004/04/20 23:20:07 millert 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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#if defined(LIBC_SCCS) && !defined(lint)
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static const char rcsid[] = "$OpenBSD: passwd.c,v 1.43 2004/04/20 23:20:07 millert 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 <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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#define NUM_OPTIONS 2 /* Number of hardcoded defaults */
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static void pw_cont(int sig);
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static const char options[NUM_OPTIONS][2][80] = {
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{"localcipher", "blowfish,4"},
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{"ypcipher", "old"}
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};
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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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static void trim_whitespace(char *);
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static int read_line(FILE *, char *, int);
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static const char *pw_default(const char *);
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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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/* Remove leading spaces */
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p = line;
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while (isspace(*p))
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p++;
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(void) 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(*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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/* Read one line of config */
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if (fgets(line, max, fp) == 0)
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return 0;
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if (!(p = strchr(line, '\n'))) {
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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, '#')))
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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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int i;
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for (i = 0; i < NUM_OPTIONS; i++)
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if (!strcmp(options[i][0], option))
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return options[i][1];
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return NULL;
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}
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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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/*
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* Retrieve password information from the /etc/passwd.conf file,
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* at the moment this is only for choosing the cipher to use.
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* It could easily be used for other authentication methods as
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* 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];
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static char result[LINE_MAX];
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char *p;
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int got = 0;
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int found = 0;
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result[0] = '\0';
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p = pw_file(_PATH_PASSWDCONF);
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if (!p || (fp = fopen(p, "r")) == NULL) {
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if (p)
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free(p);
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if ((p = (char *)pw_default(option))) {
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strncpy(data, p, max - 1);
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data[max - 1] = '\0';
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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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free(p);
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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)) ||
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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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char *p2;
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/* Leaving key field */
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if (strchr(line, ':')) {
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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, "=")) || 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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strlcpy(result, p2, sizeof result);
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found = 1;
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break;
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}
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}
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}
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fclose(fp);
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/*
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* If we got no result and were looking for a default
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* value, try hard coded defaults.
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*/
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if (!strlen(result) && !strcmp(key,"default") &&
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(p = (char *)pw_default(option)))
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strncpy(data, p, max - 1);
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else
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strncpy(data, result, max - 1);
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data[max - 1] = '\0';
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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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int save_errno;
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if (!pw_lck)
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return (-1);
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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, 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(pw_lck, O_WRONLY|O_CREAT|O_EXCL, 0600);
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}
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save_errno = errno;
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if (fd != -1 && fcntl(fd, F_SETFD, 1) == -1) {
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close(fd);
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fd = -1;
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}
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(void) umask(old_mode);
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errno = save_errno;
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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 * volatile 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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if (first == 'n')
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pw_error(NULL, 0, 0);
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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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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, sizeof(buf), from);) {
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|
if ((ep = strchr(buf, '\n')) == NULL) {
|
|
|
warnx("%s: line too long", master);
|
|
|
pw_error(NULL, 0, 1);
|
|
|
}
|
|
|
if (done) {
|
|
|
(void)fprintf(to, "%s", buf);
|
|
|
if (ferror(to))
|
|
|
goto err;
|
|
|
continue;
|
|
|
}
|
|
|
if (!(p = strchr(buf, ':'))) {
|
|
|
warnx("%s: corrupted entry", master);
|
|
|
pw_error(NULL, 0, 1);
|
|
|
}
|
|
|
*p = '\0';
|
|
|
if (strcmp(buf, opw ? opw->pw_name : pw->pw_name)) {
|
|
|
*p = ':';
|
|
|
(void)fprintf(to, "%s", buf);
|
|
|
if (ferror(to))
|
|
|
goto err;
|
|
|
continue;
|
|
|
}
|
|
|
if (opw != NULL) {
|
|
|
*p = ':';
|
|
|
*ep = '\0';
|
|
|
if (!pw_scan(buf, &tpw, NULL))
|
|
|
pw_error(NULL, 0, 1);
|
|
|
if (!pw_equal(&tpw, opw)) {
|
|
|
warnx("%s: inconsistent entry", master);
|
|
|
pw_error(NULL, 0, 1);
|
|
|
}
|
|
|
}
|
|
|
(void)fprintf(to, "%s:%s:%u:%u:%s:%d:%d:%s:%s:%s\n",
|
|
|
pw->pw_name, pw->pw_passwd, (u_int)pw->pw_uid,
|
|
|
(u_int)pw->pw_gid, pw->pw_class, pw->pw_change,
|
|
|
pw->pw_expire, pw->pw_gecos, pw->pw_dir,
|
|
|
pw->pw_shell);
|
|
|
done = 1;
|
|
|
if (ferror(to))
|
|
|
goto err;
|
|
|
}
|
|
|
if (!done)
|
|
|
(void)fprintf(to, "%s:%s:%d:%d:%s:%d:%d:%s:%s:%s\n",
|
|
|
pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid,
|
|
|
pw->pw_class, pw->pw_change, pw->pw_expire, pw->pw_gecos,
|
|
|
pw->pw_dir, pw->pw_shell);
|
|
|
|
|
|
if (ferror(to))
|
|
|
err:
|
|
|
pw_error(NULL, 0, 1);
|
|
|
free(master);
|
|
|
(void)fclose(to);
|
|
|
}
|
|
|
|
|
|
int
|
|
|
pw_scan(char *bp, struct passwd *pw, int *flags)
|
|
|
{
|
|
|
u_long id;
|
|
|
int root;
|
|
|
char *p, *sh, *p2;
|
|
|
|
|
|
if (flags != (int *)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;
|
|
|
id = strtoul(p, &p2, 10);
|
|
|
if (root && id) {
|
|
|
warnx("root uid should be 0");
|
|
|
return (0);
|
|
|
}
|
|
|
if (*p2 != '\0') {
|
|
|
warnx("illegal uid field");
|
|
|
return (0);
|
|
|
}
|
|
|
if (id > UID_MAX) {
|
|
|
/* errno is set to ERANGE by strtoul(3) */
|
|
|
warnx("uid greater than %u", UID_MAX-1);
|
|
|
return (0);
|
|
|
}
|
|
|
pw->pw_uid = (uid_t)id;
|
|
|
if ((*p == '\0') && (flags != (int *)NULL))
|
|
|
*flags |= _PASSWORD_NOUID;
|
|
|
|
|
|
if (!(p = strsep(&bp, ":"))) /* gid */
|
|
|
goto fmt;
|
|
|
id = strtoul(p, &p2, 10);
|
|
|
if (*p2 != '\0') {
|
|
|
warnx("illegal gid field");
|
|
|
return (0);
|
|
|
}
|
|
|
if (id > UID_MAX) {
|
|
|
/* errno is set to ERANGE by strtoul(3) */
|
|
|
warnx("gid greater than %u", UID_MAX-1);
|
|
|
return (0);
|
|
|
}
|
|
|
pw->pw_gid = (gid_t)id;
|
|
|
if ((*p == '\0') && (flags != (int *)NULL))
|
|
|
*flags |= _PASSWORD_NOGID;
|
|
|
|
|
|
pw->pw_class = strsep(&bp, ":"); /* class */
|
|
|
if (!(p = strsep(&bp, ":"))) /* change */
|
|
|
goto fmt;
|
|
|
pw->pw_change = atol(p);
|
|
|
if ((*p == '\0') && (flags != (int *)NULL))
|
|
|
*flags |= _PASSWORD_NOCHG;
|
|
|
if (!(p = strsep(&bp, ":"))) /* expire */
|
|
|
goto fmt;
|
|
|
pw->pw_expire = atol(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 err, int eval)
|
|
|
{
|
|
|
char *master = pw_file(_PATH_MASTERPASSWD);
|
|
|
|
|
|
if (err) {
|
|
|
if (name)
|
|
|
warn("%s", name);
|
|
|
else
|
|
|
warn(NULL);
|
|
|
}
|
|
|
if (master) {
|
|
|
warnx("%s: unchanged", master);
|
|
|
free(master);
|
|
|
}
|
|
|
|
|
|
pw_abort();
|
|
|
exit(eval);
|
|
|
}
|