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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)pw_scan.c 8.3 (Berkeley) 4/2/94 30 * $FreeBSD: src/lib/libc/gen/pw_scan.c,v 1.26 2007/01/09 00:27:55 imp Exp $ 31 * $DragonFly: src/usr.sbin/pwd_mkdb/pw_scan.c,v 1.3 2005/12/05 02:40:27 swildner Exp $ 32 */ 33 34 /* 35 * This module is used to "verify" password entries by chpass(1) and 36 * pwd_mkdb(8). 37 */ 38 39 #include <sys/param.h> 40 41 #include <err.h> 42 #include <errno.h> 43 #include <fcntl.h> 44 #include <pwd.h> 45 #include <stdio.h> 46 #include <string.h> 47 #include <stdlib.h> 48 #include <unistd.h> 49 50 #include "pw_scan.h" 51 52 /* 53 * Some software assumes that IDs are short. We should emit warnings 54 * for id's which cannot be stored in a short, but we are more liberal 55 * by default, warning for IDs greater than USHRT_MAX. 56 * 57 * If pw_big_ids_warning is -1 on entry to pw_scan(), it will be set based 58 * on the existence of PW_SCAN_BIG_IDS in the environment. 59 */ 60 static int pw_big_ids_warning = -1; 61 62 int 63 __pw_scan(char *bp, struct passwd *pw, int flags) 64 { 65 uid_t id; 66 int root; 67 char *ep, *p, *sh; 68 69 if (pw_big_ids_warning == -1) 70 pw_big_ids_warning = getenv("PW_SCAN_BIG_IDS") == NULL ? 1 : 0; 71 72 pw->pw_fields = 0; 73 if (!(pw->pw_name = strsep(&bp, ":"))) /* login */ 74 goto fmt; 75 root = !strcmp(pw->pw_name, "root"); 76 if (pw->pw_name[0] && (pw->pw_name[0] != '+' || pw->pw_name[1] == '\0')) 77 pw->pw_fields |= _PWF_NAME; 78 79 if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */ 80 goto fmt; 81 if (pw->pw_passwd[0]) 82 pw->pw_fields |= _PWF_PASSWD; 83 84 if (!(p = strsep(&bp, ":"))) /* uid */ 85 goto fmt; 86 if (p[0]) 87 pw->pw_fields |= _PWF_UID; 88 else { 89 if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') { 90 if (flags & _PWSCAN_WARN) 91 warnx("no uid for user %s", pw->pw_name); 92 return (0); 93 } 94 } 95 id = strtoul(p, &ep, 10); 96 if (errno == ERANGE) { 97 if (flags & _PWSCAN_WARN) 98 warnx("%s > max uid value (%lu)", p, ULONG_MAX); 99 return (0); 100 } 101 if (*ep != '\0') { 102 if (flags & _PWSCAN_WARN) 103 warnx("%s uid is incorrect", p); 104 return (0); 105 } 106 if (root && id) { 107 if (flags & _PWSCAN_WARN) 108 warnx("root uid should be 0"); 109 return (0); 110 } 111 if (flags & _PWSCAN_WARN && pw_big_ids_warning && id > USHRT_MAX) { 112 warnx("%s > recommended max uid value (%u)", p, USHRT_MAX); 113 /*return (0);*/ /* THIS SHOULD NOT BE FATAL! */ 114 } 115 pw->pw_uid = id; 116 117 if (!(p = strsep(&bp, ":"))) /* gid */ 118 goto fmt; 119 if (p[0]) 120 pw->pw_fields |= _PWF_GID; 121 else { 122 if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') { 123 if (flags & _PWSCAN_WARN) 124 warnx("no gid for user %s", pw->pw_name); 125 return (0); 126 } 127 } 128 id = strtoul(p, &ep, 10); 129 if (errno == ERANGE) { 130 if (flags & _PWSCAN_WARN) 131 warnx("%s > max gid value (%lu)", p, ULONG_MAX); 132 return (0); 133 } 134 if (*ep != '\0') { 135 if (flags & _PWSCAN_WARN) 136 warnx("%s gid is incorrect", p); 137 return (0); 138 } 139 if (flags & _PWSCAN_WARN && pw_big_ids_warning && id > USHRT_MAX) { 140 warnx("%s > recommended max gid value (%u)", p, USHRT_MAX); 141 /* return (0); This should not be fatal! */ 142 } 143 pw->pw_gid = id; 144 145 if (flags & _PWSCAN_MASTER ) { 146 if (!(pw->pw_class = strsep(&bp, ":"))) /* class */ 147 goto fmt; 148 if (pw->pw_class[0]) 149 pw->pw_fields |= _PWF_CLASS; 150 151 if (!(p = strsep(&bp, ":"))) /* change */ 152 goto fmt; 153 if (p[0]) 154 pw->pw_fields |= _PWF_CHANGE; 155 pw->pw_change = atol(p); 156 157 if (!(p = strsep(&bp, ":"))) /* expire */ 158 goto fmt; 159 if (p[0]) 160 pw->pw_fields |= _PWF_EXPIRE; 161 pw->pw_expire = atol(p); 162 } 163 if (!(pw->pw_gecos = strsep(&bp, ":"))) /* gecos */ 164 goto fmt; 165 if (pw->pw_gecos[0]) 166 pw->pw_fields |= _PWF_GECOS; 167 168 if (!(pw->pw_dir = strsep(&bp, ":"))) /* directory */ 169 goto fmt; 170 if (pw->pw_dir[0]) 171 pw->pw_fields |= _PWF_DIR; 172 173 if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */ 174 goto fmt; 175 176 p = pw->pw_shell; 177 if (root && *p) { /* empty == /bin/sh */ 178 for (setusershell();;) { 179 if (!(sh = getusershell())) { 180 if (flags & _PWSCAN_WARN) 181 warnx("warning, unknown root shell"); 182 break; 183 } 184 if (!strcmp(p, sh)) 185 break; 186 } 187 endusershell(); 188 } 189 if (p[0]) 190 pw->pw_fields |= _PWF_SHELL; 191 192 if ((p = strsep(&bp, ":"))) { /* too many */ 193 fmt: 194 if (flags & _PWSCAN_WARN) 195 warnx("corrupted entry"); 196 return (0); 197 } 198 return (1); 199 } 200