1 /* $NetBSD: field.c,v 1.12 2009/04/11 12:10:02 lukem 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 1.12 2009/04/11 12:10:02 lukem 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 (!(pw->pw_passwd = strdup(p))) { 89 warnx("can't save password entry"); 90 return (1); 91 } 92 93 return (0); 94 } 95 96 /* ARGSUSED */ 97 int 98 p_uid(const char *p, struct passwd *pw, ENTRY *ep) 99 { 100 unsigned long id; 101 char *np; 102 103 if (!*p) { 104 warnx("empty uid field"); 105 return (1); 106 } 107 if (!isdigit((unsigned char)*p)) { 108 warnx("illegal uid"); 109 return (1); 110 } 111 errno = 0; 112 id = strtoul(p, &np, 10); 113 /* 114 * We don't need to check the return value of strtoul() 115 * since ULONG_MAX is greater than UID_MAX. 116 */ 117 if (*np || id > UID_MAX) { 118 warnx("illegal uid"); 119 return (1); 120 } 121 pw->pw_uid = (uid_t)id; 122 return (0); 123 } 124 125 /* ARGSUSED */ 126 int 127 p_gid(const char *p, struct passwd *pw, ENTRY *ep) 128 { 129 struct group *gr; 130 unsigned long id; 131 char *np; 132 133 if (!*p) { 134 warnx("empty gid field"); 135 return (1); 136 } 137 if (!isdigit((unsigned char)*p)) { 138 if (!(gr = getgrnam(p))) { 139 warnx("unknown group %s", p); 140 return (1); 141 } 142 pw->pw_gid = gr->gr_gid; 143 return (0); 144 } 145 errno = 0; 146 id = strtoul(p, &np, 10); 147 /* 148 * We don't need to check the return value of strtoul() 149 * since ULONG_MAX is greater than GID_MAX. 150 */ 151 if (*np || id > GID_MAX) { 152 warnx("illegal gid"); 153 return (1); 154 } 155 pw->pw_gid = (gid_t)id; 156 return (0); 157 } 158 159 /* ARGSUSED */ 160 int 161 p_class(const char *p, struct passwd *pw, ENTRY *ep) 162 { 163 164 if (!(pw->pw_class = strdup(p))) { 165 warnx("can't save entry"); 166 return (1); 167 } 168 169 return (0); 170 } 171 172 /* ARGSUSED */ 173 int 174 p_change(const char *p, struct passwd *pw, ENTRY *ep) 175 { 176 177 if (!atot(p, &pw->pw_change)) 178 return (0); 179 warnx("illegal date for change field"); 180 return (1); 181 } 182 183 /* ARGSUSED */ 184 int 185 p_expire(const char *p, struct passwd *pw, ENTRY *ep) 186 { 187 188 if (!atot(p, &pw->pw_expire)) 189 return (0); 190 warnx("illegal date for expire field"); 191 return (1); 192 } 193 194 /* ARGSUSED */ 195 int 196 p_gecos(const char *p, struct passwd *pw, ENTRY *ep) 197 { 198 199 if (!(ep->save = strdup(p))) { 200 warnx("can't save entry"); 201 return (1); 202 } 203 return (0); 204 } 205 206 /* ARGSUSED */ 207 int 208 p_hdir(const char *p, struct passwd *pw, ENTRY *ep) 209 { 210 211 if (!*p) { 212 warnx("empty home directory field"); 213 return (1); 214 } 215 if (!(pw->pw_dir = strdup(p))) { 216 warnx("can't save entry"); 217 return (1); 218 } 219 return (0); 220 } 221 222 /* ARGSUSED */ 223 int 224 p_shell(const char *p, struct passwd *pw, ENTRY *ep) 225 { 226 const char *t; 227 228 if (!*p) { 229 if (!(pw->pw_shell = strdup(_PATH_BSHELL))) { 230 warnx("can't save entry"); 231 return (1); 232 } 233 return (0); 234 } 235 /* only admin can change from or to "restricted" shells */ 236 if (uid && pw->pw_shell && !ok_shell(pw->pw_shell)) { 237 warnx("%s: current shell non-standard", pw->pw_shell); 238 return (1); 239 } 240 if (!(t = ok_shell(p))) { 241 if (uid) { 242 warnx("%s: non-standard shell", p); 243 return (1); 244 } 245 } 246 else 247 p = t; 248 if (!(pw->pw_shell = strdup(p))) { 249 warnx("can't save entry"); 250 return (1); 251 } 252 return (0); 253 } 254
Indexes created Sat Sep 20 22:09:52 GMT 2025