1 /* 2 * Copyright (c) 1988, 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 * @(#)field.c 8.4 (Berkeley) 4/2/94 34 */ 35 36 #include <sys/param.h> 37 #include <sys/stat.h> 38 39 #include <ctype.h> 40 #include <err.h> 41 #include <errno.h> 42 #include <grp.h> 43 #include <pwd.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 #include "chpass.h" 50 #include "pathnames.h" 51 52 /* ARGSUSED */ 53 int 54 p_login(p, pw, ep) 55 char *p; 56 struct passwd *pw; 57 ENTRY *ep; 58 { 59 if (!*p) { 60 warnx("empty login field"); 61 return (1); 62 } 63 if (*p == '-') { 64 warnx("login names may not begin with a hyphen"); 65 return (1); 66 } 67 if (!(pw->pw_name = strdup(p))) { 68 warnx("can't save entry"); 69 return (1); 70 } 71 if (strchr(p, '.')) 72 warnx("\'.\' is dangerous in a login name"); 73 for (; *p; ++p) 74 if (isupper(*p)) { 75 warnx("upper-case letters are dangerous in a login name"); 76 break; 77 } 78 return (0); 79 } 80 81 /* ARGSUSED */ 82 int 83 p_passwd(p, pw, ep) 84 char *p; 85 struct passwd *pw; 86 ENTRY *ep; 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(p, pw, ep) 101 char *p; 102 struct passwd *pw; 103 ENTRY *ep; 104 { 105 uid_t id; 106 char *np; 107 108 if (!*p) { 109 warnx("empty uid field"); 110 return (1); 111 } 112 if (!isdigit(*p)) { 113 warnx("illegal uid"); 114 return (1); 115 } 116 errno = 0; 117 id = strtoul(p, &np, 10); 118 if (*np || (id == ULONG_MAX && errno == ERANGE)) { 119 warnx("illegal uid"); 120 return (1); 121 } 122 pw->pw_uid = id; 123 return (0); 124 } 125 126 /* ARGSUSED */ 127 int 128 p_gid(p, pw, ep) 129 char *p; 130 struct passwd *pw; 131 ENTRY *ep; 132 { 133 struct group *gr; 134 gid_t id; 135 char *np; 136 137 if (!*p) { 138 warnx("empty gid field"); 139 return (1); 140 } 141 if (!isdigit(*p)) { 142 if (!(gr = getgrnam(p))) { 143 warnx("unknown group %s", p); 144 return (1); 145 } 146 pw->pw_gid = gr->gr_gid; 147 return (0); 148 } 149 errno = 0; 150 id = strtoul(p, &np, 10); 151 if (*np || (id == ULONG_MAX && errno == ERANGE)) { 152 warnx("illegal gid"); 153 return (1); 154 } 155 pw->pw_gid = id; 156 return (0); 157 } 158 159 /* ARGSUSED */ 160 int 161 p_class(p, pw, ep) 162 char *p; 163 struct passwd *pw; 164 ENTRY *ep; 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(p, pw, ep) 179 char *p; 180 struct passwd *pw; 181 ENTRY *ep; 182 { 183 if (!atot(p, &pw->pw_change)) 184 return (0); 185 warnx("illegal date for change field"); 186 return (1); 187 } 188 189 /* ARGSUSED */ 190 int 191 p_expire(p, pw, ep) 192 char *p; 193 struct passwd *pw; 194 ENTRY *ep; 195 { 196 if (!atot(p, &pw->pw_expire)) 197 return (0); 198 warnx("illegal date for expire field"); 199 return (1); 200 } 201 202 /* ARGSUSED */ 203 int 204 p_gecos(p, pw, ep) 205 char *p; 206 struct passwd *pw; 207 ENTRY *ep; 208 { 209 if (!*p) 210 ep->save = ""; 211 else if (!(ep->save = strdup(p))) { 212 warnx("can't save entry"); 213 return (1); 214 } 215 return (0); 216 } 217 218 /* ARGSUSED */ 219 int 220 p_hdir(p, pw, ep) 221 char *p; 222 struct passwd *pw; 223 ENTRY *ep; 224 { 225 if (!*p) { 226 warnx("empty home directory field"); 227 return (1); 228 } 229 if (!(pw->pw_dir = strdup(p))) { 230 warnx("can't save entry"); 231 return (1); 232 } 233 return (0); 234 } 235 236 /* ARGSUSED */ 237 int 238 p_shell(p, pw, ep) 239 char *p; 240 struct passwd *pw; 241 ENTRY *ep; 242 { 243 char *t, *ok_shell(); 244 struct stat sbuf; 245 246 if (!*p) { 247 pw->pw_shell = _PATH_BSHELL; 248 return (0); 249 } 250 /* only admin can change from or to "restricted" shells */ 251 if (uid && pw->pw_shell && !ok_shell(pw->pw_shell)) { 252 warnx("%s: current shell non-standard", pw->pw_shell); 253 return (1); 254 } 255 if (!(t = ok_shell(p))) { 256 if (uid) { 257 warnx("%s: non-standard shell", p); 258 return (1); 259 } 260 } 261 else 262 p = t; 263 if (!(pw->pw_shell = strdup(p))) { 264 warnx("can't save entry"); 265 return (1); 266 } 267 if (stat(pw->pw_shell, &sbuf) < 0) { 268 if (errno == ENOENT) 269 warnx("WARNING: shell '%s' does not exist", 270 pw->pw_shell); 271 else 272 warn("WARNING: can't stat shell '%s'", pw->pw_shell); 273 return (0); 274 } 275 if (!S_ISREG(sbuf.st_mode)) { 276 warnx("WARNING: shell '%s' is not a regular file", 277 pw->pw_shell); 278 return (0); 279 } 280 if ((sbuf.st_mode & (S_IXOTH | S_IXGRP | S_IXUSR)) == 0) { 281 warnx("WARNING: shell '%s' is not executable", pw->pw_shell); 282 return (0); 283 } 284 return (0); 285 } 286