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 34 #ifndef lint 35 static const char sccsid[] = "@(#)field.c 8.4 (Berkeley) 4/2/94"; 36 #endif /* not lint */ 37 38 #include <sys/param.h> 39 #include <sys/stat.h> 40 41 #include <ctype.h> 42 #include <err.h> 43 #include <errno.h> 44 #include <grp.h> 45 #include <pwd.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 51 #include "chpass.h" 52 #include "pathnames.h" 53 54 /* ARGSUSED */ 55 int 56 p_login(p, pw, ep) 57 char *p; 58 struct passwd *pw; 59 ENTRY *ep; 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(*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(p, pw, ep) 86 char *p; 87 struct passwd *pw; 88 ENTRY *ep; 89 { 90 if (!*p) 91 pw->pw_passwd = ""; /* "NOLOGIN"; */ 92 else if (!(pw->pw_passwd = strdup(p))) { 93 warnx("can't save password entry"); 94 return (1); 95 } 96 97 return (0); 98 } 99 100 /* ARGSUSED */ 101 int 102 p_uid(p, pw, ep) 103 char *p; 104 struct passwd *pw; 105 ENTRY *ep; 106 { 107 uid_t id; 108 char *np; 109 110 if (!*p) { 111 warnx("empty uid field"); 112 return (1); 113 } 114 if (!isdigit(*p)) { 115 warnx("illegal uid"); 116 return (1); 117 } 118 errno = 0; 119 id = strtoul(p, &np, 10); 120 if (*np || (id == ULONG_MAX && errno == ERANGE)) { 121 warnx("illegal uid"); 122 return (1); 123 } 124 pw->pw_uid = id; 125 return (0); 126 } 127 128 /* ARGSUSED */ 129 int 130 p_gid(p, pw, ep) 131 char *p; 132 struct passwd *pw; 133 ENTRY *ep; 134 { 135 struct group *gr; 136 gid_t id; 137 char *np; 138 139 if (!*p) { 140 warnx("empty gid field"); 141 return (1); 142 } 143 if (!isdigit(*p)) { 144 if (!(gr = getgrnam(p))) { 145 warnx("unknown group %s", p); 146 return (1); 147 } 148 pw->pw_gid = gr->gr_gid; 149 return (0); 150 } 151 errno = 0; 152 id = strtoul(p, &np, 10); 153 if (*np || (id == ULONG_MAX && errno == ERANGE)) { 154 warnx("illegal gid"); 155 return (1); 156 } 157 pw->pw_gid = id; 158 return (0); 159 } 160 161 /* ARGSUSED */ 162 int 163 p_class(p, pw, ep) 164 char *p; 165 struct passwd *pw; 166 ENTRY *ep; 167 { 168 if (!*p) 169 pw->pw_class = ""; 170 else if (!(pw->pw_class = strdup(p))) { 171 warnx("can't save entry"); 172 return (1); 173 } 174 175 return (0); 176 } 177 178 /* ARGSUSED */ 179 int 180 p_change(p, pw, ep) 181 char *p; 182 struct passwd *pw; 183 ENTRY *ep; 184 { 185 if (!atot(p, &pw->pw_change)) 186 return (0); 187 warnx("illegal date for change field"); 188 return (1); 189 } 190 191 /* ARGSUSED */ 192 int 193 p_expire(p, pw, ep) 194 char *p; 195 struct passwd *pw; 196 ENTRY *ep; 197 { 198 if (!atot(p, &pw->pw_expire)) 199 return (0); 200 warnx("illegal date for expire field"); 201 return (1); 202 } 203 204 /* ARGSUSED */ 205 int 206 p_gecos(p, pw, ep) 207 char *p; 208 struct passwd *pw; 209 ENTRY *ep; 210 { 211 if (!*p) 212 ep->save = ""; 213 else if (!(ep->save = strdup(p))) { 214 warnx("can't save entry"); 215 return (1); 216 } 217 return (0); 218 } 219 220 /* ARGSUSED */ 221 int 222 p_hdir(p, pw, ep) 223 char *p; 224 struct passwd *pw; 225 ENTRY *ep; 226 { 227 if (!*p) { 228 warnx("empty home directory field"); 229 return (1); 230 } 231 if (!(pw->pw_dir = strdup(p))) { 232 warnx("can't save entry"); 233 return (1); 234 } 235 return (0); 236 } 237 238 /* ARGSUSED */ 239 int 240 p_shell(p, pw, ep) 241 char *p; 242 struct passwd *pw; 243 ENTRY *ep; 244 { 245 char *t, *ok_shell(); 246 struct stat sbuf; 247 248 if (!*p) { 249 pw->pw_shell = _PATH_BSHELL; 250 return (0); 251 } 252 /* only admin can change from or to "restricted" shells */ 253 if (uid && pw->pw_shell && !ok_shell(pw->pw_shell)) { 254 warnx("%s: current shell non-standard", pw->pw_shell); 255 return (1); 256 } 257 if (!(t = ok_shell(p))) { 258 if (uid) { 259 warnx("%s: non-standard shell", p); 260 return (1); 261 } 262 } 263 else 264 p = t; 265 if (!(pw->pw_shell = strdup(p))) { 266 warnx("can't save entry"); 267 return (1); 268 } 269 if (stat(pw->pw_shell, &sbuf) < 0) { 270 if (errno == ENOENT) 271 warnx("WARNING: shell '%s' does not exist", 272 pw->pw_shell); 273 else 274 warn("WARNING: can't stat shell '%s'", pw->pw_shell); 275 return (0); 276 } 277 if (!S_ISREG(sbuf.st_mode)) { 278 warnx("WARNING: shell '%s' is not a regular file", 279 pw->pw_shell); 280 return (0); 281 } 282 if ((sbuf.st_mode & (S_IXOTH | S_IXGRP | S_IXUSR)) == 0) { 283 warnx("WARNING: shell '%s' is not executable", pw->pw_shell); 284 return (0); 285 } 286 return (0); 287 } 288