pw_scan.c revision 53581
1/*- 2 * Copyright (c) 1990, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35#if 0 36static char sccsid[] = "@(#)pw_scan.c 8.3 (Berkeley) 4/2/94"; 37#endif 38static const char rcsid[] = 39 "$FreeBSD: head/lib/libc/gen/pw_scan.c 53581 1999-11-22 12:42:38Z eivind $"; 40#endif /* not lint */ 41 42/* 43 * This module is used to "verify" password entries by chpass(1) and 44 * pwd_mkdb(8). 45 */ 46 47#include <sys/param.h> 48 49#include <err.h> 50#include <fcntl.h> 51#include <pwd.h> 52#include <stdio.h> 53#include <string.h> 54#include <stdlib.h> 55#include <unistd.h> 56 57#include "pw_scan.h" 58 59/* 60 * Some software assumes that IDs are short. We should emit warnings 61 * for id's which can not be stored in a short, but we are more liberal 62 * by default, warning for IDs greater than USHRT_MAX. 63 */ 64int pw_big_ids_warning = 1; 65 66int 67pw_scan(bp, pw) 68 char *bp; 69 struct passwd *pw; 70{ 71 long id; 72 int root; 73 char *p, *sh; 74 75 pw->pw_fields = 0; 76 if (!(pw->pw_name = strsep(&bp, ":"))) /* login */ 77 goto fmt; 78 root = !strcmp(pw->pw_name, "root"); 79 if(pw->pw_name[0] && (pw->pw_name[0] != '+' || pw->pw_name[1] == '\0')) 80 pw->pw_fields |= _PWF_NAME; 81 82 if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */ 83 goto fmt; 84 if(pw->pw_passwd[0]) pw->pw_fields |= _PWF_PASSWD; 85 86 if (!(p = strsep(&bp, ":"))) /* uid */ 87 goto fmt; 88 if (p[0]) 89 pw->pw_fields |= _PWF_UID; 90 else { 91 if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') { 92 warnx("no uid for user %s", pw->pw_name); 93 return (0); 94 } 95 } 96 id = atol(p); 97 if (root && id) { 98 warnx("root uid should be 0"); 99 return (0); 100 } 101 if (pw_big_ids_warning && id > USHRT_MAX) { 102 warnx("%s > max uid value (%u)", p, USHRT_MAX); 103 /*return (0);*/ /* THIS SHOULD NOT BE FATAL! */ 104 } 105 pw->pw_uid = id; 106 107 if (!(p = strsep(&bp, ":"))) /* gid */ 108 goto fmt; 109 if(p[0]) pw->pw_fields |= _PWF_GID; 110 id = atol(p); 111 if (pw_big_ids_warning && id > USHRT_MAX) { 112 warnx("%s > max gid value (%u)", p, USHRT_MAX); 113 /* return (0); This should not be fatal! */ 114 } 115 pw->pw_gid = id; 116 117 pw->pw_class = strsep(&bp, ":"); /* class */ 118 if(pw->pw_class[0]) pw->pw_fields |= _PWF_CLASS; 119 120 if (!(p = strsep(&bp, ":"))) /* change */ 121 goto fmt; 122 if(p[0]) pw->pw_fields |= _PWF_CHANGE; 123 pw->pw_change = atol(p); 124 125 if (!(p = strsep(&bp, ":"))) /* expire */ 126 goto fmt; 127 if(p[0]) pw->pw_fields |= _PWF_EXPIRE; 128 pw->pw_expire = atol(p); 129 130 if (!(pw->pw_gecos = strsep(&bp, ":"))) /* gecos */ 131 goto fmt; 132 if(pw->pw_gecos[0]) pw->pw_fields |= _PWF_GECOS; 133 134 if (!(pw->pw_dir = strsep(&bp, ":"))) /* directory */ 135 goto fmt; 136 if(pw->pw_dir[0]) pw->pw_fields |= _PWF_DIR; 137 138 if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */ 139 goto fmt; 140 141 p = pw->pw_shell; 142 if (root && *p) /* empty == /bin/sh */ 143 for (setusershell();;) { 144 if (!(sh = getusershell())) { 145 warnx("warning, unknown root shell"); 146 break; 147 } 148 if (!strcmp(p, sh)) 149 break; 150 } 151 if(p[0]) pw->pw_fields |= _PWF_SHELL; 152 153 if ((p = strsep(&bp, ":"))) { /* too many */ 154fmt: warnx("corrupted entry"); 155 return (0); 156 } 157 return (1); 158} 159