pw_scan.c revision 104348
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 104348 2002-10-02 07:02:46Z maxim $"); 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 cannot 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 -1 on entry to pw_scan(), it will be set based 64 * on the existence of PW_SCAN_BIG_IDS in the environment. 65 */ 66static int pw_big_ids_warning = -1; 67 68int 69__pw_scan(char *bp, struct passwd *pw, int flags) 70{ 71 uid_t id; 72 int root; 73 char *ep, *p, *sh; 74 75 if (pw_big_ids_warning == -1) 76 pw_big_ids_warning = getenv("PW_SCAN_BIG_IDS") == NULL ? 1 : 0; 77 78 pw->pw_fields = 0; 79 if (!(pw->pw_name = strsep(&bp, ":"))) /* login */ 80 goto fmt; 81 root = !strcmp(pw->pw_name, "root"); 82 if (pw->pw_name[0] && (pw->pw_name[0] != '+' || pw->pw_name[1] == '\0')) 83 pw->pw_fields |= _PWF_NAME; 84 85 if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */ 86 goto fmt; 87 if (pw->pw_passwd[0]) 88 pw->pw_fields |= _PWF_PASSWD; 89 90 if (!(p = strsep(&bp, ":"))) /* uid */ 91 goto fmt; 92 if (p[0]) 93 pw->pw_fields |= _PWF_UID; 94 else { 95 if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') { 96 if (flags & _PWSCAN_WARN) 97 warnx("no uid for user %s", pw->pw_name); 98 return (0); 99 } 100 } 101 id = strtoul(p, &ep, 10); 102 if (errno == ERANGE) { 103 if (flags & _PWSCAN_WARN) 104 warnx("%s > max uid value (%lu)", p, ULONG_MAX); 105 return (0); 106 } 107 if (*ep != '\0') { 108 if (flags & _PWSCAN_WARN) 109 warnx("%s uid is incorrect", p); 110 return (0); 111 } 112 if (root && id) { 113 if (flags & _PWSCAN_WARN) 114 warnx("root uid should be 0"); 115 return (0); 116 } 117 if (flags & _PWSCAN_WARN && pw_big_ids_warning && id > USHRT_MAX) { 118 warnx("%s > recommended max uid value (%u)", p, USHRT_MAX); 119 /*return (0);*/ /* THIS SHOULD NOT BE FATAL! */ 120 } 121 pw->pw_uid = id; 122 123 if (!(p = strsep(&bp, ":"))) /* gid */ 124 goto fmt; 125 if (p[0]) 126 pw->pw_fields |= _PWF_GID; 127 id = strtoul(p, &ep, 10); 128 if (errno == ERANGE) { 129 if (flags & _PWSCAN_WARN) 130 warnx("%s > max gid value (%lu)", p, ULONG_MAX); 131 return (0); 132 } 133 if (*ep != '\0') { 134 if (flags & _PWSCAN_WARN) 135 warnx("%s gid is incorrect", p); 136 return (0); 137 } 138 if (flags & _PWSCAN_WARN && pw_big_ids_warning && id > USHRT_MAX) { 139 warnx("%s > recommended max gid value (%u)", p, USHRT_MAX); 140 /* return (0); This should not be fatal! */ 141 } 142 pw->pw_gid = id; 143 144 if (flags & _PWSCAN_MASTER ) { 145 if (!(pw->pw_class = strsep(&bp, ":"))) /* class */ 146 goto fmt; 147 if (pw->pw_class[0]) 148 pw->pw_fields |= _PWF_CLASS; 149 150 if (!(p = strsep(&bp, ":"))) /* change */ 151 goto fmt; 152 if (p[0]) 153 pw->pw_fields |= _PWF_CHANGE; 154 pw->pw_change = atol(p); 155 156 if (!(p = strsep(&bp, ":"))) /* expire */ 157 goto fmt; 158 if (p[0]) 159 pw->pw_fields |= _PWF_EXPIRE; 160 pw->pw_expire = atol(p); 161 } 162 if (!(pw->pw_gecos = strsep(&bp, ":"))) /* gecos */ 163 goto fmt; 164 if (pw->pw_gecos[0]) 165 pw->pw_fields |= _PWF_GECOS; 166 167 if (!(pw->pw_dir = strsep(&bp, ":"))) /* directory */ 168 goto fmt; 169 if (pw->pw_dir[0]) 170 pw->pw_fields |= _PWF_DIR; 171 172 if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */ 173 goto fmt; 174 175 p = pw->pw_shell; 176 if (root && *p) /* empty == /bin/sh */ 177 for (setusershell();;) { 178 if (!(sh = getusershell())) { 179 if (flags & _PWSCAN_WARN) 180 warnx("warning, unknown root shell"); 181 break; 182 } 183 if (!strcmp(p, sh)) 184 break; 185 } 186 if (p[0]) 187 pw->pw_fields |= _PWF_SHELL; 188 189 if ((p = strsep(&bp, ":"))) { /* too many */ 190fmt: 191 if (flags & _PWSCAN_WARN) 192 warnx("corrupted entry"); 193 return (0); 194 } 195 return (1); 196} 197