pw_scan.c revision 90039
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#if defined(LIBC_SCCS) && !defined(lint) 35static char sccsid[] = "@(#)pw_scan.c 8.3 (Berkeley) 4/2/94"; 36#endif /* LIBC_SCCS and not lint */ 37#include <sys/cdefs.h> 38__FBSDID("$FreeBSD: head/lib/libc/gen/pw_scan.c 90039 2002-02-01 00:57:29Z obrien $"); 39 40/* 41 * This module is used to "verify" password entries by chpass(1) and 42 * pwd_mkdb(8). 43 */ 44 45#include <sys/param.h> 46 47#include <err.h> 48#include <errno.h> 49#include <fcntl.h> 50#include <pwd.h> 51#include <stdio.h> 52#include <string.h> 53#include <stdlib.h> 54#include <unistd.h> 55 56#include "pw_scan.h" 57 58/* 59 * Some software assumes that IDs are short. We should emit warnings 60 * for id's which can not be stored in a short, but we are more liberal 61 * by default, warning for IDs greater than USHRT_MAX. 62 * 63 * If pw_big_ids_warning is anything other than -1 on entry to pw_scan() 64 * it will be set based on the existance of PW_SCAN_BIG_IDS in the 65 * environment. 66 */ 67static int pw_big_ids_warning = -1; 68 69int 70__pw_scan(char *bp, struct passwd *pw, int flags) 71{ 72 uid_t id; 73 int root; 74 char *p, *sh; 75 76 if (pw_big_ids_warning == -1) 77 pw_big_ids_warning = getenv("PW_SCAN_BIG_IDS") == NULL ? 1 : 0; 78 79 pw->pw_fields = 0; 80 if (!(pw->pw_name = strsep(&bp, ":"))) /* login */ 81 goto fmt; 82 root = !strcmp(pw->pw_name, "root"); 83 if (pw->pw_name[0] && (pw->pw_name[0] != '+' || pw->pw_name[1] == '\0')) 84 pw->pw_fields |= _PWF_NAME; 85 86 if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */ 87 goto fmt; 88 if (pw->pw_passwd[0]) 89 pw->pw_fields |= _PWF_PASSWD; 90 91 if (!(p = strsep(&bp, ":"))) /* uid */ 92 goto fmt; 93 if (p[0]) 94 pw->pw_fields |= _PWF_UID; 95 else { 96 if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') { 97 if (flags & _PWSCAN_WARN) 98 warnx("no uid for user %s", pw->pw_name); 99 return (0); 100 } 101 } 102 id = strtoul(p, (char **)NULL, 10); 103 if (errno == ERANGE) { 104 if (flags & _PWSCAN_WARN) 105 warnx("%s > max uid value (%lu)", p, ULONG_MAX); 106 return (0); 107 } 108 if (root && id) { 109 if (flags & _PWSCAN_WARN) 110 warnx("root uid should be 0"); 111 return (0); 112 } 113 if (flags & _PWSCAN_WARN && pw_big_ids_warning && id > USHRT_MAX) { 114 warnx("%s > recommended max uid value (%u)", p, USHRT_MAX); 115 /*return (0);*/ /* THIS SHOULD NOT BE FATAL! */ 116 } 117 pw->pw_uid = id; 118 119 if (!(p = strsep(&bp, ":"))) /* gid */ 120 goto fmt; 121 if (p[0]) 122 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]) 139 pw->pw_fields |= _PWF_CLASS; 140 141 if (!(p = strsep(&bp, ":"))) /* change */ 142 goto fmt; 143 if (p[0]) 144 pw->pw_fields |= _PWF_CHANGE; 145 pw->pw_change = atol(p); 146 147 if (!(p = strsep(&bp, ":"))) /* expire */ 148 goto fmt; 149 if (p[0]) 150 pw->pw_fields |= _PWF_EXPIRE; 151 pw->pw_expire = atol(p); 152 } 153 if (!(pw->pw_gecos = strsep(&bp, ":"))) /* gecos */ 154 goto fmt; 155 if (pw->pw_gecos[0]) 156 pw->pw_fields |= _PWF_GECOS; 157 158 if (!(pw->pw_dir = strsep(&bp, ":"))) /* directory */ 159 goto fmt; 160 if (pw->pw_dir[0]) 161 pw->pw_fields |= _PWF_DIR; 162 163 if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */ 164 goto fmt; 165 166 p = pw->pw_shell; 167 if (root && *p) /* empty == /bin/sh */ 168 for (setusershell();;) { 169 if (!(sh = getusershell())) { 170 if (flags & _PWSCAN_WARN) 171 warnx("warning, unknown root shell"); 172 break; 173 } 174 if (!strcmp(p, sh)) 175 break; 176 } 177 if (p[0]) 178 pw->pw_fields |= _PWF_SHELL; 179 180 if ((p = strsep(&bp, ":"))) { /* too many */ 181fmt: 182 if (flags & _PWSCAN_WARN) 183 warnx("corrupted entry"); 184 return (0); 185 } 186 return (1); 187} 188