1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1990, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * Copyright (c) 2002 Networks Associates Technology, Inc. 7 * All rights reserved. 8 * 9 * Portions of this software were developed for the FreeBSD Project by 10 * ThinkSec AS and NAI Labs, the Security Research Division of Network 11 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 12 * ("CBOSS"), as part of the DARPA CHATS research program. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by the University of 25 * California, Berkeley and its contributors. 26 * 4. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 */ 42 43 #if 0 44 #endif 45 46 #include <sys/cdefs.h> 47 #include <sys/param.h> 48 #include <sys/stat.h> 49 50 #include <ctype.h> 51 #include <err.h> 52 #include <errno.h> 53 #include <paths.h> 54 #include <pwd.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #include <pw_scan.h> 61 #include <libutil.h> 62 63 #include "chpass.h" 64 65 static int display(const char *tfn, struct passwd *pw); 66 static struct passwd *verify(const char *tfn, struct passwd *pw); 67 68 struct passwd * 69 edit(const char *tfn, struct passwd *pw) 70 { 71 struct passwd *npw; 72 char *line; 73 size_t len; 74 75 if (display(tfn, pw) == -1) 76 return (NULL); 77 for (;;) { 78 switch (pw_edit(1)) { 79 case -1: 80 return (NULL); 81 case 0: 82 return (pw_dup(pw)); 83 default: 84 break; 85 } 86 if ((npw = verify(tfn, pw)) != NULL) 87 return (npw); 88 free(npw); 89 printf("re-edit the password file? "); 90 fflush(stdout); 91 if ((line = fgetln(stdin, &len)) == NULL) { 92 warn("fgetln()"); 93 return (NULL); 94 } 95 if (len > 0 && (*line == 'N' || *line == 'n')) 96 return (NULL); 97 } 98 } 99 100 /* 101 * display -- 102 * print out the file for the user to edit; strange side-effect: 103 * set conditional flag if the user gets to edit the shell. 104 */ 105 static int 106 display(const char *tfn, struct passwd *pw) 107 { 108 FILE *fp; 109 char *bp, *gecos, *p; 110 111 if ((fp = fopen(tfn, "w")) == NULL) { 112 warn("%s", tfn); 113 return (-1); 114 } 115 116 (void)fprintf(fp, 117 "#Changing user information for %s.\n", pw->pw_name); 118 if (master_mode) { 119 (void)fprintf(fp, "Login: %s\n", pw->pw_name); 120 (void)fprintf(fp, "Password: %s\n", pw->pw_passwd); 121 (void)fprintf(fp, "Uid [#]: %lu\n", (unsigned long)pw->pw_uid); 122 (void)fprintf(fp, "Gid [# or name]: %lu\n", 123 (unsigned long)pw->pw_gid); 124 (void)fprintf(fp, "Change [month day year]: %s\n", 125 ttoa(pw->pw_change)); 126 (void)fprintf(fp, "Expire [month day year]: %s\n", 127 ttoa(pw->pw_expire)); 128 (void)fprintf(fp, "Class: %s\n", pw->pw_class); 129 (void)fprintf(fp, "Home directory: %s\n", pw->pw_dir); 130 (void)fprintf(fp, "Shell: %s\n", 131 *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL); 132 } 133 /* Only admin can change "restricted" shells. */ 134 #if 0 135 else if (ok_shell(pw->pw_shell)) 136 /* 137 * Make shell a restricted field. Ugly with a 138 * necklace, but there's not much else to do. 139 */ 140 #else 141 else if ((!list[E_SHELL].restricted && ok_shell(pw->pw_shell)) || 142 master_mode) 143 /* 144 * If change not restrict (table.c) and standard shell 145 * OR if root, then allow editing of shell. 146 */ 147 #endif 148 (void)fprintf(fp, "Shell: %s\n", 149 *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL); 150 else 151 list[E_SHELL].restricted = 1; 152 153 if ((bp = gecos = strdup(pw->pw_gecos)) == NULL) { 154 warn(NULL); 155 fclose(fp); 156 return (-1); 157 } 158 159 p = strsep(&bp, ","); 160 p = strdup(p ? p : ""); 161 list[E_NAME].save = p; 162 if (!list[E_NAME].restricted || master_mode) 163 (void)fprintf(fp, "Full Name: %s\n", p); 164 165 p = strsep(&bp, ","); 166 p = strdup(p ? p : ""); 167 list[E_LOCATE].save = p; 168 if (!list[E_LOCATE].restricted || master_mode) 169 (void)fprintf(fp, "Office Location: %s\n", p); 170 171 p = strsep(&bp, ","); 172 p = strdup(p ? p : ""); 173 list[E_BPHONE].save = p; 174 if (!list[E_BPHONE].restricted || master_mode) 175 (void)fprintf(fp, "Office Phone: %s\n", p); 176 177 p = strsep(&bp, ","); 178 p = strdup(p ? p : ""); 179 list[E_HPHONE].save = p; 180 if (!list[E_HPHONE].restricted || master_mode) 181 (void)fprintf(fp, "Home Phone: %s\n", p); 182 183 bp = strdup(bp ? bp : ""); 184 list[E_OTHER].save = bp; 185 if (!list[E_OTHER].restricted || master_mode) 186 (void)fprintf(fp, "Other information: %s\n", bp); 187 188 free(gecos); 189 190 (void)fchown(fileno(fp), getuid(), getgid()); 191 (void)fclose(fp); 192 return (0); 193 } 194 195 static struct passwd * 196 verify(const char *tfn, struct passwd *pw) 197 { 198 struct passwd *npw; 199 ENTRY *ep; 200 char *buf, *p, *val; 201 struct stat sb; 202 FILE *fp; 203 int line; 204 size_t len; 205 206 if ((pw = pw_dup(pw)) == NULL) 207 return (NULL); 208 if ((fp = fopen(tfn, "r")) == NULL || 209 fstat(fileno(fp), &sb) == -1) { 210 warn("%s", tfn); 211 free(pw); 212 return (NULL); 213 } 214 if (sb.st_size == 0) { 215 warnx("corrupted temporary file"); 216 fclose(fp); 217 free(pw); 218 return (NULL); 219 } 220 val = NULL; 221 for (line = 1; (buf = fgetln(fp, &len)) != NULL; ++line) { 222 if (*buf == '\0' || *buf == '#') 223 continue; 224 while (len > 0 && isspace(buf[len - 1])) 225 --len; 226 for (ep = list;; ++ep) { 227 if (!ep->prompt) { 228 warnx("%s: unrecognized field on line %d", 229 tfn, line); 230 goto bad; 231 } 232 if (ep->len > len) 233 continue; 234 if (strncasecmp(buf, ep->prompt, ep->len) != 0) 235 continue; 236 if (ep->restricted && !master_mode) { 237 warnx("%s: you may not change the %s field", 238 tfn, ep->prompt); 239 goto bad; 240 } 241 for (p = buf; p < buf + len && *p != ':'; ++p) 242 /* nothing */ ; 243 if (*p != ':') { 244 warnx("%s: line %d corrupted", tfn, line); 245 goto bad; 246 } 247 while (++p < buf + len && isspace(*p)) 248 /* nothing */ ; 249 free(val); 250 asprintf(&val, "%.*s", (int)(buf + len - p), p); 251 if (val == NULL) 252 goto bad; 253 if (ep->except && strpbrk(val, ep->except)) { 254 warnx("%s: invalid character in \"%s\" field '%s'", 255 tfn, ep->prompt, val); 256 goto bad; 257 } 258 if ((ep->func)(val, pw, ep)) 259 goto bad; 260 break; 261 } 262 } 263 free(val); 264 fclose(fp); 265 266 /* Build the gecos field. */ 267 len = asprintf(&p, "%s,%s,%s,%s,%s", list[E_NAME].save, 268 list[E_LOCATE].save, list[E_BPHONE].save, 269 list[E_HPHONE].save, list[E_OTHER].save); 270 if (p == NULL) { 271 warn("asprintf()"); 272 free(pw); 273 return (NULL); 274 } 275 while (len > 0 && p[len - 1] == ',') 276 p[--len] = '\0'; 277 pw->pw_gecos = p; 278 buf = pw_make(pw); 279 free(pw); 280 free(p); 281 if (buf == NULL) { 282 warn("pw_make()"); 283 return (NULL); 284 } 285 npw = pw_scan(buf, PWSCAN_WARN|PWSCAN_MASTER); 286 free(buf); 287 return (npw); 288 bad: 289 free(pw); 290 free(val); 291 fclose(fp); 292 return (NULL); 293 } 294