1 /* $NetBSD: field.c,v 1.10 2004/10/30 17:11:24 dsl 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 1.10 2004/10/30 17:11:24 dsl 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(p, pw, ep) 59 const char *p; 60 struct passwd *pw; 61 ENTRY *ep; 62 { 63 64 if (!*p) { 65 warnx("empty login field"); 66 return (1); 67 } 68 if (*p == '-') { 69 warnx("login names may not begin with a hyphen"); 70 return (1); 71 } 72 if (!(pw->pw_name = strdup(p))) { 73 warnx("can't save entry"); 74 return (1); 75 } 76 if (strchr(p, '.')) 77 warnx("\'.\' is dangerous in a login name"); 78 for (; *p; ++p) 79 if (isupper((unsigned char)*p)) { 80 warnx("upper-case letters are dangerous in a login name"); 81 break; 82 } 83 return (0); 84 } 85 86 /* ARGSUSED */ 87 int 88 p_passwd(p, pw, ep) 89 const char *p; 90 struct passwd *pw; 91 ENTRY *ep; 92 { 93 94 if (!*p) 95 pw->pw_passwd = ""; /* "NOLOGIN"; */ 96 else if (!(pw->pw_passwd = strdup(p))) { 97 warnx("can't save password entry"); 98 return (1); 99 } 100 101 return (0); 102 } 103 104 /* ARGSUSED */ 105 int 106 p_uid(p, pw, ep) 107 const char *p; 108 struct passwd *pw; 109 ENTRY *ep; 110 { 111 unsigned long id; 112 char *np; 113 114 if (!*p) { 115 warnx("empty uid field"); 116 return (1); 117 } 118 if (!isdigit((unsigned char)*p)) { 119 warnx("illegal uid"); 120 return (1); 121 } 122 errno = 0; 123 id = strtoul(p, &np, 10); 124 /* 125 * We don't need to check the return value of strtoul() 126 * since ULONG_MAX is greater than UID_MAX. 127 */ 128 if (*np || id > UID_MAX) { 129 warnx("illegal uid"); 130 return (1); 131 } 132 pw->pw_uid = (uid_t)id; 133 return (0); 134 } 135 136 /* ARGSUSED */ 137 int 138 p_gid(p, pw, ep) 139 const char *p; 140 struct passwd *pw; 141 ENTRY *ep; 142 { 143 struct group *gr; 144 unsigned long id; 145 char *np; 146 147 if (!*p) { 148 warnx("empty gid field"); 149 return (1); 150 } 151 if (!isdigit((unsigned char)*p)) { 152 if (!(gr = getgrnam(p))) { 153 warnx("unknown group %s", p); 154 return (1); 155 } 156 pw->pw_gid = gr->gr_gid; 157 return (0); 158 } 159 errno = 0; 160 id = strtoul(p, &np, 10); 161 /* 162 * We don't need to check the return value of strtoul() 163 * since ULONG_MAX is greater than GID_MAX. 164 */ 165 if (*np || id > GID_MAX) { 166 warnx("illegal gid"); 167 return (1); 168 } 169 pw->pw_gid = (gid_t)id; 170 return (0); 171 } 172 173 /* ARGSUSED */ 174 int 175 p_class(p, pw, ep) 176 const char *p; 177 struct passwd *pw; 178 ENTRY *ep; 179 { 180 181 if (!*p) 182 pw->pw_class = ""; 183 else if (!(pw->pw_class = strdup(p))) { 184 warnx("can't save entry"); 185 return (1); 186 } 187 188 return (0); 189 } 190 191 /* ARGSUSED */ 192 int 193 p_change(p, pw, ep) 194 const char *p; 195 struct passwd *pw; 196 ENTRY *ep; 197 { 198 199 if (!atot(p, &pw->pw_change)) 200 return (0); 201 warnx("illegal date for change field"); 202 return (1); 203 } 204 205 /* ARGSUSED */ 206 int 207 p_expire(p, pw, ep) 208 const char *p; 209 struct passwd *pw; 210 ENTRY *ep; 211 { 212 213 if (!atot(p, &pw->pw_expire)) 214 return (0); 215 warnx("illegal date for expire field"); 216 return (1); 217 } 218 219 /* ARGSUSED */ 220 int 221 p_gecos(p, pw, ep) 222 const char *p; 223 struct passwd *pw; 224 ENTRY *ep; 225 { 226 227 if (!(ep->save = strdup(p))) { 228 warnx("can't save entry"); 229 return (1); 230 } 231 return (0); 232 } 233 234 /* ARGSUSED */ 235 int 236 p_hdir(p, pw, ep) 237 const char *p; 238 struct passwd *pw; 239 ENTRY *ep; 240 { 241 242 if (!*p) { 243 warnx("empty home directory field"); 244 return (1); 245 } 246 if (!(pw->pw_dir = strdup(p))) { 247 warnx("can't save entry"); 248 return (1); 249 } 250 return (0); 251 } 252 253 /* ARGSUSED */ 254 int 255 p_shell(p, pw, ep) 256 const char *p; 257 struct passwd *pw; 258 ENTRY *ep; 259 { 260 const char *t; 261 262 if (!*p) { 263 pw->pw_shell = _PATH_BSHELL; 264 return (0); 265 } 266 /* only admin can change from or to "restricted" shells */ 267 if (uid && pw->pw_shell && !ok_shell(pw->pw_shell)) { 268 warnx("%s: current shell non-standard", pw->pw_shell); 269 return (1); 270 } 271 if (!(t = ok_shell(p))) { 272 if (uid) { 273 warnx("%s: non-standard shell", p); 274 return (1); 275 } 276 } 277 else 278 p = t; 279 if (!(pw->pw_shell = strdup(p))) { 280 warnx("can't save entry"); 281 return (1); 282 } 283 return (0); 284 } 285