1 /* $NetBSD: field.c,v 1.11 2005/02/17 17:09:48 xtraeme Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1993, 1994 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 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)field.c 8.4 (Berkeley) 4/2/94"; 36 #else 37 __RCSID("$NetBSD: field.c,v 1.11 2005/02/17 17:09:48 xtraeme Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/param.h> 42 43 #include <ctype.h> 44 #include <err.h> 45 #include <errno.h> 46 #include <grp.h> 47 #include <pwd.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 #include "chpass.h" 54 #include "pathnames.h" 55 56 /* ARGSUSED */ 57 int 58 p_login(const char *p, struct passwd *pw, ENTRY *ep) 59 { 60 61 if (!*p) { 62 warnx("empty login field"); 63 return (1); 64 } 65 if (*p == '-') { 66 warnx("login names may not begin with a hyphen"); 67 return (1); 68 } 69 if (!(pw->pw_name = strdup(p))) { 70 warnx("can't save entry"); 71 return (1); 72 } 73 if (strchr(p, '.')) 74 warnx("\'.\' is dangerous in a login name"); 75 for (; *p; ++p) 76 if (isupper((unsigned char)*p)) { 77 warnx("upper-case letters are dangerous in a login name"); 78 break; 79 } 80 return (0); 81 } 82 83 /* ARGSUSED */ 84 int 85 p_passwd(const char *p, struct passwd *pw, ENTRY *ep) 86 { 87 88 if (!*p) 89 pw->pw_passwd = ""; /* "NOLOGIN"; */ 90 else if (!(pw->pw_passwd = strdup(p))) { 91 warnx("can't save password entry"); 92 return (1); 93 } 94 95 return (0); 96 } 97 98 /* ARGSUSED */ 99 int 100 p_uid(const char *p, struct passwd *pw, ENTRY *ep) 101 { 102 unsigned long id; 103 char *np; 104 105 if (!*p) { 106 warnx("empty uid field"); 107 return (1); 108 } 109 if (!isdigit((unsigned char)*p)) { 110 warnx("illegal uid"); 111 return (1); 112 } 113 errno = 0; 114 id = strtoul(p, &np, 10); 115 /* 116 * We don't need to check the return value of strtoul() 117 * since ULONG_MAX is greater than UID_MAX. 118 */ 119 if (*np || id > UID_MAX) { 120 warnx("illegal uid"); 121 return (1); 122 } 123 pw->pw_uid = (uid_t)id; 124 return (0); 125 } 126 127 /* ARGSUSED */ 128 int 129 p_gid(const char *p, struct passwd *pw, ENTRY *ep) 130 { 131 struct group *gr; 132 unsigned long id; 133 char *np; 134 135 if (!*p) { 136 warnx("empty gid field"); 137 return (1); 138 } 139 if (!isdigit((unsigned char)*p)) { 140 if (!(gr = getgrnam(p))) { 141 warnx("unknown group %s", p); 142 return (1); 143 } 144 pw->pw_gid = gr->gr_gid; 145 return (0); 146 } 147 errno = 0; 148 id = strtoul(p, &np, 10); 149 /* 150 * We don't need to check the return value of strtoul() 151 * since ULONG_MAX is greater than GID_MAX. 152 */ 153 if (*np || id > GID_MAX) { 154 warnx("illegal gid"); 155 return (1); 156 } 157 pw->pw_gid = (gid_t)id; 158 return (0); 159 } 160 161 /* ARGSUSED */ 162 int 163 p_class(const char *p, struct passwd *pw, ENTRY *ep) 164 { 165 166 if (!*p) 167 pw->pw_class = ""; 168 else if (!(pw->pw_class = strdup(p))) { 169 warnx("can't save entry"); 170 return (1); 171 } 172 173 return (0); 174 } 175 176 /* ARGSUSED */ 177 int 178 p_change(const char *p, struct passwd *pw, ENTRY *ep) 179 { 180 181 if (!atot(p, &pw->pw_change)) 182 return (0); 183 warnx("illegal date for change field"); 184 return (1); 185 } 186 187 /* ARGSUSED */ 188 int 189 p_expire(const char *p, struct passwd *pw, ENTRY *ep) 190 { 191 192 if (!atot(p, &pw->pw_expire)) 193 return (0); 194 warnx("illegal date for expire field"); 195 return (1); 196 } 197 198 /* ARGSUSED */ 199 int 200 p_gecos(const char *p, struct passwd *pw, ENTRY *ep) 201 { 202 203 if (!(ep->save = strdup(p))) { 204 warnx("can't save entry"); 205 return (1); 206 } 207 return (0); 208 } 209 210 /* ARGSUSED */ 211 int 212 p_hdir(const char *p, struct passwd *pw, ENTRY *ep) 213 { 214 215 if (!*p) { 216 warnx("empty home directory field"); 217 return (1); 218 } 219 if (!(pw->pw_dir = strdup(p))) { 220 warnx("can't save entry"); 221 return (1); 222 } 223 return (0); 224 } 225 226 /* ARGSUSED */ 227 int 228 p_shell(const char *p, struct passwd *pw, ENTRY *ep) 229 { 230 const char *t; 231 232 if (!*p) { 233 pw->pw_shell = _PATH_BSHELL; 234 return (0); 235 } 236 /* only admin can change from or to "restricted" shells */ 237 if (uid && pw->pw_shell && !ok_shell(pw->pw_shell)) { 238 warnx("%s: current shell non-standard", pw->pw_shell); 239 return (1); 240 } 241 if (!(t = ok_shell(p))) { 242 if (uid) { 243 warnx("%s: non-standard shell", p); 244 return (1); 245 } 246 } 247 else 248 p = t; 249 if (!(pw->pw_shell = strdup(p))) { 250 warnx("can't save entry"); 251 return (1); 252 } 253 return (0); 254 } 255