1 /*- 2 * Copyright (c) 1990, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 2002 Networks Associates Technology, Inc. 5 * All rights reserved. 6 * 7 * Portions of this software were developed for the FreeBSD Project by 8 * ThinkSec AS and NAI Labs, the Security Research Division of Network 9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 10 * ("CBOSS"), as part of the DARPA CHATS research program. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)edit.c 8.3 (Berkeley) 4/2/94 41 * $FreeBSD: src/usr.bin/chpass/edit.c,v 1.23 2003/04/09 18:18:42 des Exp $ 42 * $DragonFly: src/usr.bin/chpass/edit.c,v 1.3 2003/10/02 17:42:26 hmp Exp $ 43 */ 44 45 #include <sys/param.h> 46 #include <sys/stat.h> 47 48 #include <ctype.h> 49 #include <err.h> 50 #include <errno.h> 51 #include <paths.h> 52 #include <pwd.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 #include <pw_scan.h> 59 #include <libutil.h> 60 61 #include "chpass.h" 62 63 static int display(const char *tfn, struct passwd *pw); 64 static struct passwd *verify(const char *tfn, struct passwd *pw); 65 66 struct passwd * 67 edit(const char *tfn, struct passwd *pw) 68 { 69 struct passwd *npw; 70 char *line; 71 size_t len; 72 73 if (display(tfn, pw) == -1) 74 return (NULL); 75 for (;;) { 76 switch (pw_edit(1)) { 77 case -1: 78 return (NULL); 79 case 0: 80 return (pw_dup(pw)); 81 default: 82 break; 83 } 84 if ((npw = verify(tfn, pw)) != NULL) 85 return (npw); 86 free(npw); 87 printf("re-edit the password file? "); 88 fflush(stdout); 89 if ((line = fgetln(stdin, &len)) == NULL) { 90 warn("fgetln()"); 91 return (NULL); 92 } 93 if (len > 0 && (*line == 'N' || *line == 'n')) 94 return (NULL); 95 } 96 } 97 98 /* 99 * display -- 100 * print out the file for the user to edit; strange side-effect: 101 * set conditional flag if the user gets to edit the shell. 102 */ 103 static int 104 display(const char *tfn, struct passwd *pw) 105 { 106 FILE *fp; 107 char *bp, *gecos, *p; 108 109 if ((fp = fopen(tfn, "w")) == NULL) { 110 warn("%s", tfn); 111 return (-1); 112 } 113 114 fprintf(fp, "#Changing user information for %s.\n", pw->pw_name); 115 if (master_mode) { 116 fprintf(fp, "Login: %s\n", pw->pw_name); 117 fprintf(fp, "Password: %s\n", pw->pw_passwd); 118 fprintf(fp, "Uid [#]: %lu\n", (unsigned long)pw->pw_uid); 119 fprintf(fp, "Gid [# or name]: %lu\n", 120 (unsigned long)pw->pw_gid); 121 fprintf(fp, "Change [month day year]: %s\n", 122 ttoa(pw->pw_change)); 123 fprintf(fp, "Expire [month day year]: %s\n", 124 ttoa(pw->pw_expire)); 125 fprintf(fp, "Class: %s\n", pw->pw_class); 126 fprintf(fp, "Home directory: %s\n", pw->pw_dir); 127 fprintf(fp, "Shell: %s\n", 128 *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL); 129 } 130 /* Only admin can change "restricted" shells. */ 131 #if 0 132 else if (ok_shell(pw->pw_shell)) 133 /* 134 * Make shell a restricted field. Ugly with a 135 * necklace, but there's not much else to do. 136 */ 137 #else 138 else if ((!list[E_SHELL].restricted && ok_shell(pw->pw_shell)) || 139 master_mode) 140 /* 141 * If change not restrict (table.c) and standard shell 142 * OR if root, then allow editing of shell. 143 */ 144 #endif 145 fprintf(fp, "Shell: %s\n", 146 *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL); 147 else 148 list[E_SHELL].restricted = 1; 149 150 if ((bp = gecos = strdup(pw->pw_gecos)) == NULL) { 151 warn(NULL); 152 fclose(fp); 153 return (-1); 154 } 155 156 p = strsep(&bp, ","); 157 p = strdup(p ? p : ""); 158 list[E_NAME].save = p; 159 if (!list[E_NAME].restricted || master_mode) 160 fprintf(fp, "Full Name: %s\n", p); 161 162 p = strsep(&bp, ","); 163 p = strdup(p ? p : ""); 164 list[E_LOCATE].save = p; 165 if (!list[E_LOCATE].restricted || master_mode) 166 fprintf(fp, "Office Location: %s\n", p); 167 168 p = strsep(&bp, ","); 169 p = strdup(p ? p : ""); 170 list[E_BPHONE].save = p; 171 if (!list[E_BPHONE].restricted || master_mode) 172 fprintf(fp, "Office Phone: %s\n", p); 173 174 p = strsep(&bp, ","); 175 p = strdup(p ? p : ""); 176 list[E_HPHONE].save = p; 177 if (!list[E_HPHONE].restricted || master_mode) 178 fprintf(fp, "Home Phone: %s\n", p); 179 180 bp = strdup(bp ? bp : ""); 181 list[E_OTHER].save = bp; 182 if (!list[E_OTHER].restricted || master_mode) 183 fprintf(fp, "Other information: %s\n", bp); 184 185 free(gecos); 186 187 fchown(fileno(fp), getuid(), getgid()); 188 fclose(fp); 189 return (0); 190 } 191 192 static struct passwd * 193 verify(const char *tfn, struct passwd *pw) 194 { 195 struct passwd *npw; 196 ENTRY *ep; 197 char *buf, *p, *val; 198 struct stat sb; 199 FILE *fp; 200 int line; 201 size_t len; 202 203 if ((pw = pw_dup(pw)) == NULL) 204 return (NULL); 205 if ((fp = fopen(tfn, "r")) == NULL || 206 fstat(fileno(fp), &sb) == -1) { 207 warn("%s", tfn); 208 free(pw); 209 return (NULL); 210 } 211 if (sb.st_size == 0) { 212 warnx("corrupted temporary file"); 213 fclose(fp); 214 free(pw); 215 return (NULL); 216 } 217 val = NULL; 218 for (line = 1; (buf = fgetln(fp, &len)) != NULL; ++line) { 219 if (*buf == '\0' || *buf == '#') 220 continue; 221 while (len > 0 && isspace(buf[len - 1])) 222 --len; 223 for (ep = list;; ++ep) { 224 if (!ep->prompt) { 225 warnx("%s: unrecognized field on line %d", 226 tfn, line); 227 goto bad; 228 } 229 if (ep->len > len) 230 continue; 231 if (strncasecmp(buf, ep->prompt, ep->len) != 0) 232 continue; 233 if (ep->restricted && !master_mode) { 234 warnx("%s: you may not change the %s field", 235 tfn, ep->prompt); 236 goto bad; 237 } 238 for (p = buf; p < buf + len && *p != ':'; ++p) 239 /* nothing */ ; 240 if (*p != ':') { 241 warnx("%s: line %d corrupted", tfn, line); 242 goto bad; 243 } 244 while (++p < buf + len && isspace(*p)) 245 /* nothing */ ; 246 free(val); 247 asprintf(&val, "%.*s", (int)(buf + len - p), p); 248 if (val == NULL) 249 goto bad; 250 if (ep->except && strpbrk(val, ep->except)) { 251 warnx("%s: invalid character in \"%s\" field '%s'", 252 tfn, ep->prompt, val); 253 goto bad; 254 } 255 if ((ep->func)(val, pw, ep)) 256 goto bad; 257 break; 258 } 259 } 260 free(val); 261 fclose(fp); 262 263 /* Build the gecos field. */ 264 len = asprintf(&p, "%s,%s,%s,%s,%s", list[E_NAME].save, 265 list[E_LOCATE].save, list[E_BPHONE].save, 266 list[E_HPHONE].save, list[E_OTHER].save); 267 if (p == NULL) { 268 warn("asprintf()"); 269 free(pw); 270 return (NULL); 271 } 272 while (len > 0 && p[len - 1] == ',') 273 p[--len] = '\0'; 274 pw->pw_gecos = p; 275 buf = pw_make(pw); 276 free(pw); 277 free(p); 278 if (buf == NULL) { 279 warn("pw_make()"); 280 return (NULL); 281 } 282 npw = pw_scan(buf, PWSCAN_WARN|PWSCAN_MASTER); 283 free(buf); 284 return (npw); 285 bad: 286 free(pw); 287 free(val); 288 fclose(fp); 289 return (NULL); 290 } 291