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 36 static char sccsid[] = "@(#)pw_scan.c 8.3 (Berkeley) 4/2/94"; 37 #endif 38 static const char rcsid[] = 39 "$FreeBSD$"; 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 */ 69 static int pw_big_ids_warning = -1; 70 71 int 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]) 91 pw->pw_fields |= _PWF_PASSWD; 92 93 if (!(p = strsep(&bp, ":"))) /* uid */ 94 goto fmt; 95 if (p[0]) 96 pw->pw_fields |= _PWF_UID; 97 else { 98 if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') { 99 if (flags & _PWSCAN_WARN) 100 warnx("no uid for user %s", pw->pw_name); 101 return (0); 102 } 103 } 104 id = strtoul(p, (char **)NULL, 10); 105 if (errno == ERANGE) { 106 if (flags & _PWSCAN_WARN) 107 warnx("%s > max uid value (%lu)", p, ULONG_MAX); 108 return (0); 109 } 110 if (root && id) { 111 if (flags & _PWSCAN_WARN) 112 warnx("root uid should be 0"); 113 return (0); 114 } 115 if (flags & _PWSCAN_WARN && pw_big_ids_warning && id > USHRT_MAX) { 116 warnx("%s > recommended max uid value (%u)", p, USHRT_MAX); 117 /*return (0);*/ /* THIS SHOULD NOT BE FATAL! */ 118 } 119 pw->pw_uid = id; 120 121 if (!(p = strsep(&bp, ":"))) /* gid */ 122 goto fmt; 123 if (p[0]) 124 pw->pw_fields |= _PWF_GID; 125 id = strtoul(p, (char **)NULL, 10); 126 if (errno == ERANGE) { 127 if (flags & _PWSCAN_WARN) 128 warnx("%s > max gid value (%lu)", p, ULONG_MAX); 129 return (0); 130 } 131 if (flags & _PWSCAN_WARN && pw_big_ids_warning && id > USHRT_MAX) { 132 warnx("%s > recommended max gid value (%u)", p, USHRT_MAX); 133 /* return (0); This should not be fatal! */ 134 } 135 pw->pw_gid = id; 136 137 if (flags & _PWSCAN_MASTER ) { 138 if (!(pw->pw_class = strsep(&bp, ":"))) /* class */ 139 goto fmt; 140 if (pw->pw_class[0]) 141 pw->pw_fields |= _PWF_CLASS; 142 143 if (!(p = strsep(&bp, ":"))) /* change */ 144 goto fmt; 145 if (p[0]) 146 pw->pw_fields |= _PWF_CHANGE; 147 pw->pw_change = atol(p); 148 149 if (!(p = strsep(&bp, ":"))) /* expire */ 150 goto fmt; 151 if (p[0]) 152 pw->pw_fields |= _PWF_EXPIRE; 153 pw->pw_expire = atol(p); 154 } 155 if (!(pw->pw_gecos = strsep(&bp, ":"))) /* gecos */ 156 goto fmt; 157 if (pw->pw_gecos[0]) 158 pw->pw_fields |= _PWF_GECOS; 159 160 if (!(pw->pw_dir = strsep(&bp, ":"))) /* directory */ 161 goto fmt; 162 if (pw->pw_dir[0]) 163 pw->pw_fields |= _PWF_DIR; 164 165 if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */ 166 goto fmt; 167 168 p = pw->pw_shell; 169 if (root && *p) /* empty == /bin/sh */ 170 for (setusershell();;) { 171 if (!(sh = getusershell())) { 172 if (flags & _PWSCAN_WARN) 173 warnx("warning, unknown root shell"); 174 break; 175 } 176 if (!strcmp(p, sh)) 177 break; 178 } 179 if (p[0]) 180 pw->pw_fields |= _PWF_SHELL; 181 182 if ((p = strsep(&bp, ":"))) { /* too many */ 183 fmt: 184 if (flags & _PWSCAN_WARN) 185 warnx("corrupted entry"); 186 return (0); 187 } 188 return (1); 189 } 190