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 copyright[] = 36 "@(#) Copyright (c) 1988, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static const char sccsid[] = "From: @(#)chpass.c 8.4 (Berkeley) 4/2/94"; 42 static const char rcsid[] = 43 "$FreeBSD: src/usr.bin/chpass/chpass.c,v 1.16.2.4 2002/08/11 14:16:42 dwmalone Exp $"; 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/stat.h> 48 #include <sys/signal.h> 49 #include <sys/time.h> 50 #include <sys/resource.h> 51 52 #include <ctype.h> 53 #include <err.h> 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <pwd.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 62 #include <pw_scan.h> 63 #include <pw_util.h> 64 #include "pw_copy.h" 65 #ifdef YP 66 #include <rpcsvc/yp.h> 67 int yp_errno = YP_TRUE; 68 #include "pw_yp.h" 69 #endif 70 71 #include "chpass.h" 72 #include "pathnames.h" 73 74 char *tempname; 75 uid_t uid; 76 77 void baduser __P((void)); 78 void usage __P((void)); 79 80 int 81 main(argc, argv) 82 int argc; 83 char **argv; 84 { 85 enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op; 86 struct passwd *pw = NULL, lpw, old_pw, *pold_pw; 87 char *username = NULL; 88 int ch, pfd, tfd; 89 char *arg = NULL; 90 #ifdef YP 91 int force_local = 0; 92 int force_yp = 0; 93 #endif 94 95 op = EDITENTRY; 96 #ifdef YP 97 while ((ch = getopt(argc, argv, "a:p:s:e:d:h:oly")) != -1) 98 #else 99 while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1) 100 #endif 101 switch(ch) { 102 case 'a': 103 op = LOADENTRY; 104 arg = optarg; 105 break; 106 case 's': 107 op = NEWSH; 108 arg = optarg; 109 break; 110 case 'p': 111 op = NEWPW; 112 arg = optarg; 113 break; 114 case 'e': 115 op = NEWEXP; 116 arg = optarg; 117 break; 118 #ifdef YP 119 case 'h': 120 #ifdef PARANOID 121 if (getuid()) { 122 warnx("Only the superuser can use the -h flag"); 123 } else { 124 #endif 125 yp_server = optarg; 126 #ifdef PARANOID 127 } 128 #endif 129 break; 130 case 'd': 131 #ifdef PARANOID 132 if (getuid()) { 133 warnx("Only the superuser can use the -d flag"); 134 } else { 135 #endif 136 yp_domain = optarg; 137 if (yp_server == NULL) 138 yp_server = "localhost"; 139 #ifdef PARANOID 140 } 141 #endif 142 break; 143 case 'l': 144 _use_yp = 0; 145 force_local = 1; 146 break; 147 case 'y': 148 _use_yp = force_yp = 1; 149 break; 150 case 'o': 151 force_old++; 152 break; 153 #endif 154 case '?': 155 default: 156 usage(); 157 } 158 argc -= optind; 159 argv += optind; 160 161 uid = getuid(); 162 163 if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) { 164 switch(argc) { 165 #ifdef YP 166 case 0: 167 GETPWUID(uid) 168 get_yp_master(1); /* XXX just to set the suser flag */ 169 break; 170 case 1: 171 GETPWNAM(*argv) 172 get_yp_master(1); /* XXX just to set the suser flag */ 173 #else 174 case 0: 175 if (!(pw = getpwuid(uid))) 176 errx(1, "unknown user: uid %lu", 177 (unsigned long)uid); 178 break; 179 case 1: 180 if (!(pw = getpwnam(*argv))) 181 errx(1, "unknown user: %s", *argv); 182 #endif 183 if (uid && uid != pw->pw_uid) 184 baduser(); 185 break; 186 default: 187 usage(); 188 } 189 190 /* Make a copy for later verification */ 191 old_pw = *pw; 192 old_pw.pw_gecos = strdup(old_pw.pw_gecos); 193 pold_pw = &old_pw; 194 } 195 196 if (op == NEWSH) { 197 /* protect p_shell -- it thinks NULL is /bin/sh */ 198 if (!arg[0]) 199 usage(); 200 if (p_shell(arg, pw, (ENTRY *)NULL)) 201 pw_error((char *)NULL, 0, 1); 202 } 203 204 if (op == NEWEXP) { 205 if (uid) /* only root can change expire */ 206 baduser(); 207 if (p_expire(arg, pw, (ENTRY *)NULL)) 208 pw_error((char *)NULL, 0, 1); 209 } 210 211 if (op == LOADENTRY) { 212 if (uid) 213 baduser(); 214 pw = &lpw; 215 if (!pw_scan(arg, pw)) 216 exit(1); 217 if ((pold_pw = getpwnam(pw->pw_name)) != NULL) { 218 old_pw = *pold_pw; 219 old_pw.pw_gecos = strdup(old_pw.pw_gecos); 220 } 221 } 222 username = pw->pw_name; 223 224 if (op == NEWPW) { 225 if (uid) 226 baduser(); 227 228 if(strchr(arg, ':')) { 229 errx(1, "invalid format for password"); 230 } 231 pw->pw_passwd = arg; 232 } 233 234 /* 235 * The temporary file/file descriptor usage is a little tricky here. 236 * 1: We start off with two fd's, one for the master password 237 * file (used to lock everything), and one for a temporary file. 238 * 2: Display() gets an fp for the temporary file, and copies the 239 * user's information into it. It then gives the temporary file 240 * to the user and closes the fp, closing the underlying fd. 241 * 3: The user edits the temporary file some number of times. 242 * 4: Verify() gets an fp for the temporary file, and verifies the 243 * contents. It can't use an fp derived from the step #2 fd, 244 * because the user's editor may have created a new instance of 245 * the file. Once the file is verified, its contents are stored 246 * in a password structure. The verify routine closes the fp, 247 * closing the underlying fd. 248 * 5: Delete the temporary file. 249 * 6: Get a new temporary file/fd. Pw_copy() gets an fp for it 250 * file and copies the master password file into it, replacing 251 * the user record with a new one. We can't use the first 252 * temporary file for this because it was owned by the user. 253 * Pw_copy() closes its fp, flushing the data and closing the 254 * underlying file descriptor. We can't close the master 255 * password fp, or we'd lose the lock. 256 * 7: Call pw_mkdb() (which renames the temporary file) and exit. 257 * The exit closes the master passwd fp/fd. 258 */ 259 pw_init(); 260 tfd = pw_tmp(); 261 262 if (op == EDITENTRY) { 263 display(tfd, pw); 264 edit(pw); 265 (void)unlink(tempname); 266 tfd = pw_tmp(); 267 } 268 269 #ifdef YP 270 if (_use_yp) { 271 yp_submit(pw); 272 (void)unlink(tempname); 273 } else { 274 #endif /* YP */ 275 pfd = pw_lock(); 276 pw_copy(pfd, tfd, pw, pold_pw); 277 278 if (!pw_mkdb(username)) 279 pw_error((char *)NULL, 0, 1); 280 #ifdef YP 281 } 282 #endif /* YP */ 283 exit(0); 284 } 285 286 void 287 baduser() 288 { 289 errx(1, "%s", strerror(EACCES)); 290 } 291 292 void 293 usage() 294 { 295 296 (void)fprintf(stderr, 297 #ifdef YP 298 "usage: chpass [-o] [-l] [-y] [-d domain] [-h host] [-a list] [-p encpass] [-s shell] [-e mmm dd yy] [user]\n"); 299 #else 300 "usage: chpass [-a list] [-p encpass] [-s shell] [-e mmm dd yy] [user]\n"); 301 #endif 302 exit(1); 303 } 304