1 /* $OpenBSD: edit.c,v 1.21 2001/07/12 05:16:57 deraadt Exp $ */ 2 /* $NetBSD: edit.c,v 1.6 1996/05/15 21:50:45 jtc Exp $ */ 3 4 /*- 5 * Copyright (c) 1990, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)edit.c 8.3 (Berkeley) 4/2/94"; 40 #else 41 static char rcsid[] = "$OpenBSD: edit.c,v 1.21 2001/07/12 05:16:57 deraadt Exp $"; 42 #endif 43 #endif /* not lint */ 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 #include <util.h> 58 59 #include "chpass.h" 60 61 void 62 edit(tempname, pw) 63 char *tempname; 64 struct passwd *pw; 65 { 66 struct stat begin, end; 67 68 for (;;) { 69 if (lstat(tempname, &begin) == -1 || S_ISLNK(begin.st_mode)) 70 pw_error(tempname, 1, 1); 71 pw_edit(1, tempname); 72 if (lstat(tempname, &end) == -1 || S_ISLNK(end.st_mode)) 73 pw_error(tempname, 1, 1); 74 if (begin.st_mtime == end.st_mtime && 75 begin.st_size == end.st_size) { 76 warnx("no changes made"); 77 pw_error(NULL, 0, 0); 78 } 79 if (verify(tempname, pw)) 80 break; 81 pw_prompt(); 82 } 83 } 84 85 /* 86 * display -- 87 * print out the file for the user to edit; strange side-effect: 88 * set conditional flag if the user gets to edit the shell. 89 */ 90 void 91 display(tempname, fd, pw) 92 char *tempname; 93 int fd; 94 struct passwd *pw; 95 { 96 FILE *fp; 97 char *bp, *p; 98 char chngstr[256]; 99 100 if (!(fp = fdopen(fd, "w"))) 101 pw_error(tempname, 1, 1); 102 103 (void)fprintf(fp, 104 "# Changing user database information for %s.\n", pw->pw_name); 105 if (!uid) { 106 (void)fprintf(fp, "Login: %s\n", pw->pw_name); 107 (void)fprintf(fp, "Encrypted password: %s\n", pw->pw_passwd); 108 (void)fprintf(fp, "Uid [#]: %u\n", pw->pw_uid); 109 (void)fprintf(fp, "Gid [# or name]: %u\n", pw->pw_gid); 110 (void)fprintf(fp, "Change [month day year]: %s\n", 111 ttoa(chngstr, sizeof(chngstr), pw->pw_change)); 112 (void)fprintf(fp, "Expire [month day year]: %s\n", 113 ttoa(chngstr, sizeof(chngstr), pw->pw_expire)); 114 (void)fprintf(fp, "Class: %s\n", pw->pw_class); 115 (void)fprintf(fp, "Home directory: %s\n", pw->pw_dir); 116 (void)fprintf(fp, "Shell: %s\n", 117 *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL); 118 } 119 /* Only admin can change "restricted" shells. */ 120 else if (ok_shell(pw->pw_shell)) 121 /* 122 * Make shell a restricted field. Ugly with a 123 * necklace, but there's not much else to do. 124 */ 125 (void)fprintf(fp, "Shell: %s\n", 126 *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL); 127 else 128 list[E_SHELL].restricted = 1; 129 bp = pw->pw_gecos; 130 p = strsep(&bp, ","); 131 (void)fprintf(fp, "Full Name: %s\n", p ? p : ""); 132 p = strsep(&bp, ","); 133 (void)fprintf(fp, "Office Location: %s\n", p ? p : ""); 134 p = strsep(&bp, ","); 135 (void)fprintf(fp, "Office Phone: %s\n", p ? p : ""); 136 p = strsep(&bp, ","); 137 (void)fprintf(fp, "Home Phone: %s\n", p ? p : ""); 138 139 (void)fchown(fd, getuid(), getgid()); 140 (void)fclose(fp); 141 } 142 143 int 144 verify(tempname, pw) 145 char *tempname; 146 struct passwd *pw; 147 { 148 ENTRY *ep; 149 char *p, *q; 150 struct stat sb; 151 FILE *fp; 152 unsigned int len, alen, line; 153 static char buf[LINE_MAX]; 154 155 if (!(fp = fopen(tempname, "r"))) 156 pw_error(tempname, 1, 1); 157 if (fstat(fileno(fp), &sb)) 158 pw_error(tempname, 1, 1); 159 if (sb.st_size == 0) { 160 warnx("corrupted temporary file"); 161 goto bad; 162 } 163 line = 0; 164 while (fgets(buf, sizeof(buf), fp)) { 165 line++; 166 if (!buf[0] || buf[0] == '#') 167 continue; 168 if (!(p = strchr(buf, '\n'))) { 169 warnx("line %d too long", line); 170 goto bad; 171 } 172 *p = '\0'; 173 for (ep = list;; ++ep) { 174 if (!ep->prompt) { 175 warnx("unrecognized field on line %d", line); 176 goto bad; 177 } 178 if (!strncasecmp(buf, ep->prompt, ep->len)) { 179 if (ep->restricted && uid) { 180 warnx( 181 "you may not change the %s field", 182 ep->prompt); 183 goto bad; 184 } 185 if (!(p = strchr(buf, ':'))) { 186 warnx("line %d corrupted", line); 187 goto bad; 188 } 189 while (isspace(*++p)); 190 for (q = p; *q && isprint(*q); q++) { 191 if (ep->except && strchr(ep->except,*q)) 192 break; 193 } 194 if (*q) { 195 warnx( 196 "illegal character in the \"%s\" field", 197 ep->prompt); 198 goto bad; 199 } 200 if ((ep->func)(p, pw, ep)) { 201 bad: (void)fclose(fp); 202 return (0); 203 } 204 break; 205 } 206 } 207 } 208 (void)fclose(fp); 209 210 if (list[E_NAME].save == NULL) 211 list[E_NAME].save = ""; 212 if (list[E_BPHONE].save == NULL) 213 list[E_BPHONE].save = ""; 214 if (list[E_HPHONE].save == NULL) 215 list[E_HPHONE].save = ""; 216 if (list[E_LOCATE].save == NULL) 217 list[E_LOCATE].save = ""; 218 219 /* Build the gecos field. */ 220 len = strlen(list[E_NAME].save) + strlen(list[E_BPHONE].save) + 221 strlen(list[E_HPHONE].save) + strlen(list[E_LOCATE].save) + 4; 222 for (alen = 0, p = list[E_NAME].save; *p; p++) 223 if (*p == '&') 224 alen = alen + strlen(pw->pw_name) - 1; 225 if (!(p = malloc(len))) 226 err(1, NULL); 227 (void)sprintf(pw->pw_gecos = p, "%s,%s,%s,%s", list[E_NAME].save, 228 list[E_LOCATE].save, list[E_BPHONE].save, list[E_HPHONE].save); 229 230 if (snprintf(buf, sizeof(buf), 231 "%s:%s:%u:%u:%s:%ld:%ld:%s:%s:%s", 232 pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class, 233 (long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos, pw->pw_dir, 234 pw->pw_shell) >= 1023 || 235 strlen(buf) + alen >= 1023) { 236 warnx("entries too long"); 237 free(p); 238 return (0); 239 } 240 free(p); 241 242 return (pw_scan(buf, pw, NULL)); 243 } 244