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 int pw_big_ids_warning = -1; 70 71 int 72 pw_scan(bp, pw) 73 char *bp; 74 struct passwd *pw; 75 { 76 uid_t id; 77 int root; 78 char *p, *sh; 79 80 if (pw_big_ids_warning == -1) 81 pw_big_ids_warning = getenv("PW_SCAN_BIG_IDS") == NULL ? 1 : 0; 82 83 pw->pw_fields = 0; 84 if (!(pw->pw_name = strsep(&bp, ":"))) /* login */ 85 goto fmt; 86 root = !strcmp(pw->pw_name, "root"); 87 if(pw->pw_name[0] && (pw->pw_name[0] != '+' || pw->pw_name[1] == '\0')) 88 pw->pw_fields |= _PWF_NAME; 89 90 if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */ 91 goto fmt; 92 if(pw->pw_passwd[0]) pw->pw_fields |= _PWF_PASSWD; 93 94 if (!(p = strsep(&bp, ":"))) /* uid */ 95 goto fmt; 96 if (p[0]) 97 pw->pw_fields |= _PWF_UID; 98 else { 99 if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') { 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 warnx("%s > max uid value (%u)", p, ULONG_MAX); 107 return (0); 108 } 109 if (root && id) { 110 warnx("root uid should be 0"); 111 return (0); 112 } 113 if (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]) pw->pw_fields |= _PWF_GID; 122 id = strtoul(p, (char **)NULL, 10); 123 if (errno == ERANGE) { 124 warnx("%s > max gid value (%u)", p, ULONG_MAX); 125 return (0); 126 } 127 if (pw_big_ids_warning && id > USHRT_MAX) { 128 warnx("%s > recommended max gid value (%u)", p, USHRT_MAX); 129 /* return (0); This should not be fatal! */ 130 } 131 pw->pw_gid = id; 132 133 pw->pw_class = strsep(&bp, ":"); /* class */ 134 if(pw->pw_class[0]) pw->pw_fields |= _PWF_CLASS; 135 136 if (!(p = strsep(&bp, ":"))) /* change */ 137 goto fmt; 138 if(p[0]) pw->pw_fields |= _PWF_CHANGE; 139 pw->pw_change = atol(p); 140 141 if (!(p = strsep(&bp, ":"))) /* expire */ 142 goto fmt; 143 if(p[0]) pw->pw_fields |= _PWF_EXPIRE; 144 pw->pw_expire = atol(p); 145 146 if (!(pw->pw_gecos = strsep(&bp, ":"))) /* gecos */ 147 goto fmt; 148 if(pw->pw_gecos[0]) pw->pw_fields |= _PWF_GECOS; 149 150 if (!(pw->pw_dir = strsep(&bp, ":"))) /* directory */ 151 goto fmt; 152 if(pw->pw_dir[0]) pw->pw_fields |= _PWF_DIR; 153 154 if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */ 155 goto fmt; 156 157 p = pw->pw_shell; 158 if (root && *p) /* empty == /bin/sh */ 159 for (setusershell();;) { 160 if (!(sh = getusershell())) { 161 warnx("warning, unknown root shell"); 162 break; 163 } 164 if (!strcmp(p, sh)) 165 break; 166 } 167 if(p[0]) pw->pw_fields |= _PWF_SHELL; 168 169 if ((p = strsep(&bp, ":"))) { /* too many */ 170 fmt: warnx("corrupted entry"); 171 return (0); 172 } 173 return (1); 174 } 175