pw_scan.c revision 87347
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 87347 2001-12-04 12:31:02Z des $"; 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 <errno.h> 51#include <fcntl.h> 52#include <pwd.h> 53#include <stdio.h> 54#include <string.h> 55#include <stdlib.h> 56#include <unistd.h> 57 58#include "pw_scan.h" 59 60/* 61 * Some software assumes that IDs are short. We should emit warnings 62 * for id's which can not be stored in a short, but we are more liberal 63 * by default, warning for IDs greater than USHRT_MAX. 64 * 65 * If pw_big_ids_warning is anything other than -1 on entry to pw_scan() 66 * it will be set based on the existance of PW_SCAN_BIG_IDS in the 67 * environment. 68 */ 69static int pw_big_ids_warning = -1; 70 71int 72__pw_scan(char *bp, struct passwd *pw, int flags) 73{ 74 uid_t id; 75 int root; 76 char *p, *sh; 77 78 if (pw_big_ids_warning == -1) 79 pw_big_ids_warning = getenv("PW_SCAN_BIG_IDS") == NULL ? 1 : 0; 80 81 pw->pw_fields = 0; 82 if (!(pw->pw_name = strsep(&bp, ":"))) /* login */ 83 goto fmt; 84 root = !strcmp(pw->pw_name, "root"); 85 if(pw->pw_name[0] && (pw->pw_name[0] != '+' || pw->pw_name[1] == '\0')) 86 pw->pw_fields |= _PWF_NAME; 87 88 if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */ 89 goto fmt; 90 if(pw->pw_passwd[0]) pw->pw_fields |= _PWF_PASSWD; 91 92 if (!(p = strsep(&bp, ":"))) /* uid */ 93 goto fmt; 94 if (p[0]) 95 pw->pw_fields |= _PWF_UID; 96 else { 97 if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') { 98 if (flags & _PWSCAN_WARN) 99 warnx("no uid for user %s", pw->pw_name); 100 return (0); 101 } 102 } 103 id = strtoul(p, (char **)NULL, 10); 104 if (errno == ERANGE) { 105 if (flags & _PWSCAN_WARN) 106 warnx("%s > max uid value (%lu)", p, ULONG_MAX); 107 return (0); 108 } 109 if (root && id) { 110 if (flags & _PWSCAN_WARN) 111 warnx("root uid should be 0"); 112 return (0); 113 } 114 if (flags & _PWSCAN_WARN && pw_big_ids_warning && id > USHRT_MAX) { 115 warnx("%s > recommended max uid value (%u)", p, USHRT_MAX); 116 /*return (0);*/ /* THIS SHOULD NOT BE FATAL! */ 117 } 118 pw->pw_uid = id; 119 120 if (!(p = strsep(&bp, ":"))) /* gid */ 121 goto fmt; 122 if(p[0]) pw->pw_fields |= _PWF_GID; 123 id = strtoul(p, (char **)NULL, 10); 124 if (errno == ERANGE) { 125 if (flags & _PWSCAN_WARN) 126 warnx("%s > max gid value (%lu)", p, ULONG_MAX); 127 return (0); 128 } 129 if (flags & _PWSCAN_WARN && pw_big_ids_warning && id > USHRT_MAX) { 130 warnx("%s > recommended max gid value (%u)", p, USHRT_MAX); 131 /* return (0); This should not be fatal! */ 132 } 133 pw->pw_gid = id; 134 135 if (flags & _PWSCAN_MASTER ) { 136 if (!(pw->pw_class = strsep(&bp, ":"))) /* class */ 137 goto fmt; 138 if(pw->pw_class[0]) pw->pw_fields |= _PWF_CLASS; 139 140 if (!(p = strsep(&bp, ":"))) /* change */ 141 goto fmt; 142 if(p[0]) pw->pw_fields |= _PWF_CHANGE; 143 pw->pw_change = atol(p); 144 145 if (!(p = strsep(&bp, ":"))) /* expire */ 146 goto fmt; 147 if(p[0]) pw->pw_fields |= _PWF_EXPIRE; 148 pw->pw_expire = atol(p); 149 } 150 if (!(pw->pw_gecos = strsep(&bp, ":"))) /* gecos */ 151 goto fmt; 152 if(pw->pw_gecos[0]) pw->pw_fields |= _PWF_GECOS; 153 154 if (!(pw->pw_dir = strsep(&bp, ":"))) /* directory */ 155 goto fmt; 156 if(pw->pw_dir[0]) pw->pw_fields |= _PWF_DIR; 157 158 if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */ 159 goto fmt; 160 161 p = pw->pw_shell; 162 if (root && *p) /* empty == /bin/sh */ 163 for (setusershell();;) { 164 if (!(sh = getusershell())) { 165 if (flags & _PWSCAN_WARN) 166 warnx("warning, unknown root shell"); 167 break; 168 } 169 if (!strcmp(p, sh)) 170 break; 171 } 172 if(p[0]) pw->pw_fields |= _PWF_SHELL; 173 174 if ((p = strsep(&bp, ":"))) { /* too many */ 175fmt: 176 if (flags & _PWSCAN_WARN) 177 warnx("corrupted entry"); 178 return (0); 179 } 180 return (1); 181} 182