1 /* $NetBSD: pw_scan.c,v 1.12 2003/08/07 16:42:55 agc Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 1993, 1994, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if HAVE_CONFIG_H 33 #include "config.h" 34 #include "compat_pwd.h" 35 #else 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 __RCSID("$NetBSD: pw_scan.c,v 1.12 2003/08/07 16:42:55 agc Exp $"); 39 #endif /* LIBC_SCCS and not lint */ 40 41 #if defined(_LIBC) 42 #include "namespace.h" 43 #endif 44 #include <sys/types.h> 45 46 #include <assert.h> 47 #include <err.h> 48 #include <limits.h> 49 #include <pwd.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 #ifdef _LIBC 56 #include "pw_private.h" 57 #endif 58 #endif /* !HAVE_CONFIG_H */ 59 60 int 61 #ifdef _LIBC 62 __pw_scan(bp, pw, flags) 63 #else 64 pw_scan(bp, pw, flags) 65 #endif 66 char *bp; 67 struct passwd *pw; 68 int *flags; 69 { 70 unsigned long id; 71 int root, inflags; 72 char *ep; 73 const char *p, *sh; 74 75 _DIAGASSERT(bp != NULL); 76 _DIAGASSERT(pw != NULL); 77 78 inflags = 0; 79 if (flags != (int *)NULL) { 80 inflags = *flags; 81 *flags = 0; 82 } 83 84 if (!(pw->pw_name = strsep(&bp, ":"))) /* login */ 85 goto fmt; 86 root = !strcmp(pw->pw_name, "root"); 87 88 if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */ 89 goto fmt; 90 91 if (!(p = strsep(&bp, ":"))) /* uid */ 92 goto fmt; 93 id = strtoul(p, &ep, 10); 94 if (root && id) { 95 if (!(inflags & _PASSWORD_NOWARN)) 96 warnx("root uid should be 0"); 97 return (0); 98 } 99 if (id > UID_MAX || *ep != '\0') { 100 if (!(inflags & _PASSWORD_NOWARN)) 101 warnx("invalid uid '%s'", p); 102 return (0); 103 } 104 pw->pw_uid = (uid_t)id; 105 if ((*p == '\0') && (flags != (int *)NULL)) 106 *flags |= _PASSWORD_NOUID; 107 108 if (!(p = strsep(&bp, ":"))) /* gid */ 109 goto fmt; 110 id = strtoul(p, &ep, 10); 111 if (id > GID_MAX || *ep != '\0') { 112 if (!(inflags & _PASSWORD_NOWARN)) 113 warnx("invalid gid '%s'", p); 114 return (0); 115 } 116 pw->pw_gid = (gid_t)id; 117 if ((*p == '\0') && (flags != (int *)NULL)) 118 *flags |= _PASSWORD_NOGID; 119 120 if (inflags & _PASSWORD_OLDFMT) { 121 pw->pw_class = ""; 122 pw->pw_change = 0; 123 pw->pw_expire = 0; 124 *flags |= (_PASSWORD_NOCHG | _PASSWORD_NOEXP); 125 } else { 126 pw->pw_class = strsep(&bp, ":"); /* class */ 127 if (!(p = strsep(&bp, ":"))) /* change */ 128 goto fmt; 129 pw->pw_change = atol(p); 130 if ((*p == '\0') && (flags != (int *)NULL)) 131 *flags |= _PASSWORD_NOCHG; 132 if (!(p = strsep(&bp, ":"))) /* expire */ 133 goto fmt; 134 pw->pw_expire = atol(p); 135 if ((*p == '\0') && (flags != (int *)NULL)) 136 *flags |= _PASSWORD_NOEXP; 137 } 138 pw->pw_gecos = strsep(&bp, ":"); /* gecos */ 139 pw->pw_dir = strsep(&bp, ":"); /* directory */ 140 if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */ 141 goto fmt; 142 143 #if !HAVE_CONFIG_H 144 p = pw->pw_shell; 145 if (root && *p) /* empty == /bin/sh */ 146 for (setusershell();;) { 147 if (!(sh = getusershell())) { 148 if (!(inflags & _PASSWORD_NOWARN)) 149 warnx("warning, unknown root shell"); 150 break; 151 } 152 if (!strcmp(p, sh)) 153 break; 154 } 155 #endif 156 157 if ((p = strsep(&bp, ":")) != NULL) { /* too many */ 158 fmt: 159 if (!(inflags & _PASSWORD_NOWARN)) 160 warnx("corrupted entry"); 161 return (0); 162 } 163 164 return (1); 165 } 166