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 * 4. 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 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char sccsid[] = "@(#)pw_scan.c 8.3 (Berkeley) 4/2/94"; 32 #endif /* LIBC_SCCS and not lint */ 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 /* 37 * This module is used to "verify" password entries by chpass(1) and 38 * pwd_mkdb(8). 39 */ 40 41 #include <sys/param.h> 42 43 #include <err.h> 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <pwd.h> 47 #include <stdio.h> 48 #include <string.h> 49 #include <stdlib.h> 50 #include <unistd.h> 51 52 #include "pw_scan.h" 53 54 /* 55 * Some software assumes that IDs are short. We should emit warnings 56 * for id's which cannot be stored in a short, but we are more liberal 57 * by default, warning for IDs greater than USHRT_MAX. 58 * 59 * If pw_big_ids_warning is -1 on entry to pw_scan(), it will be set based 60 * on the existence of PW_SCAN_BIG_IDS in the environment. 61 */ 62 static int pw_big_ids_warning = -1; 63 64 int 65 __pw_scan(char *bp, struct passwd *pw, int flags) 66 { 67 uid_t id; 68 int root; 69 char *ep, *p, *sh; 70 71 if (pw_big_ids_warning == -1) 72 pw_big_ids_warning = getenv("PW_SCAN_BIG_IDS") == NULL ? 1 : 0; 73 74 pw->pw_fields = 0; 75 if (!(pw->pw_name = strsep(&bp, ":"))) /* login */ 76 goto fmt; 77 root = !strcmp(pw->pw_name, "root"); 78 if (pw->pw_name[0] && (pw->pw_name[0] != '+' || pw->pw_name[1] == '\0')) 79 pw->pw_fields |= _PWF_NAME; 80 81 if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */ 82 goto fmt; 83 if (pw->pw_passwd[0]) 84 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 if (flags & _PWSCAN_WARN) 93 warnx("no uid for user %s", pw->pw_name); 94 return (0); 95 } 96 } 97 id = strtoul(p, &ep, 10); 98 if (errno == ERANGE) { 99 if (flags & _PWSCAN_WARN) 100 warnx("%s > max uid value (%lu)", p, ULONG_MAX); 101 return (0); 102 } 103 if (*ep != '\0') { 104 if (flags & _PWSCAN_WARN) 105 warnx("%s uid is incorrect", p); 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 else { 124 if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') { 125 if (flags & _PWSCAN_WARN) 126 warnx("no gid for user %s", pw->pw_name); 127 return (0); 128 } 129 } 130 id = strtoul(p, &ep, 10); 131 if (errno == ERANGE) { 132 if (flags & _PWSCAN_WARN) 133 warnx("%s > max gid value (%lu)", p, ULONG_MAX); 134 return (0); 135 } 136 if (*ep != '\0') { 137 if (flags & _PWSCAN_WARN) 138 warnx("%s gid is incorrect", p); 139 return (0); 140 } 141 if (flags & _PWSCAN_WARN && pw_big_ids_warning && id > USHRT_MAX) { 142 warnx("%s > recommended max gid value (%u)", p, USHRT_MAX); 143 /* return (0); This should not be fatal! */ 144 } 145 pw->pw_gid = id; 146 147 if (flags & _PWSCAN_MASTER ) { 148 if (!(pw->pw_class = strsep(&bp, ":"))) /* class */ 149 goto fmt; 150 if (pw->pw_class[0]) 151 pw->pw_fields |= _PWF_CLASS; 152 153 if (!(p = strsep(&bp, ":"))) /* change */ 154 goto fmt; 155 if (p[0]) 156 pw->pw_fields |= _PWF_CHANGE; 157 pw->pw_change = atol(p); 158 159 if (!(p = strsep(&bp, ":"))) /* expire */ 160 goto fmt; 161 if (p[0]) 162 pw->pw_fields |= _PWF_EXPIRE; 163 pw->pw_expire = atol(p); 164 } 165 if (!(pw->pw_gecos = strsep(&bp, ":"))) /* gecos */ 166 goto fmt; 167 if (pw->pw_gecos[0]) 168 pw->pw_fields |= _PWF_GECOS; 169 170 if (!(pw->pw_dir = strsep(&bp, ":"))) /* directory */ 171 goto fmt; 172 if (pw->pw_dir[0]) 173 pw->pw_fields |= _PWF_DIR; 174 175 if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */ 176 goto fmt; 177 178 p = pw->pw_shell; 179 if (root && *p) { /* empty == /bin/sh */ 180 for (setusershell();;) { 181 if (!(sh = getusershell())) { 182 if (flags & _PWSCAN_WARN) 183 warnx("warning, unknown root shell"); 184 break; 185 } 186 if (!strcmp(p, sh)) 187 break; 188 } 189 endusershell(); 190 } 191 if (p[0]) 192 pw->pw_fields |= _PWF_SHELL; 193 194 if ((p = strsep(&bp, ":"))) { /* too many */ 195 fmt: 196 if (flags & _PWSCAN_WARN) 197 warnx("corrupted entry"); 198 return (0); 199 } 200 return (1); 201 } 202