1 /* $OpenBSD: edit.c,v 1.32 2009/03/05 20:53:13 millert 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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)edit.c 8.3 (Berkeley) 4/2/94"; 36 #else 37 static char rcsid[] = "$OpenBSD: edit.c,v 1.32 2009/03/05 20:53:13 millert Exp $"; 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/param.h> 42 #include <sys/stat.h> 43 44 #include <ctype.h> 45 #include <err.h> 46 #include <errno.h> 47 #include <fcntl.h> 48 #include <paths.h> 49 #include <pwd.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 #include <util.h> 55 56 #include "chpass.h" 57 58 int 59 edit(char *tempname, struct passwd *pw) 60 { 61 struct stat begin, end; 62 63 for (;;) { 64 if (lstat(tempname, &begin) == -1 || S_ISLNK(begin.st_mode)) 65 return (EDIT_ERROR); 66 pw_edit(1, tempname); 67 if (lstat(tempname, &end) == -1 || S_ISLNK(end.st_mode)) 68 return (EDIT_ERROR); 69 if (!timespeccmp(&begin.st_mtimespec, &end.st_mtimespec, -) && 70 begin.st_size == end.st_size) { 71 warnx("no changes made"); 72 return (EDIT_NOCHANGE); 73 } 74 if (verify(tempname, pw)) 75 break; 76 pw_prompt(); 77 } 78 return(EDIT_OK); 79 } 80 81 /* 82 * display -- 83 * print out the file for the user to edit; strange side-effect: 84 * set conditional flag if the user gets to edit the shell. 85 */ 86 void 87 display(char *tempname, int fd, struct passwd *pw) 88 { 89 FILE *fp; 90 char *bp, *p; 91 char chngstr[256]; 92 93 if (!(fp = fdopen(fd, "w"))) 94 pw_error(tempname, 1, 1); 95 96 (void)fprintf(fp, 97 "# Changing user database information for %s.\n", pw->pw_name); 98 if (!uid) { 99 (void)fprintf(fp, "Login: %s\n", pw->pw_name); 100 (void)fprintf(fp, "Encrypted password: %s\n", pw->pw_passwd); 101 (void)fprintf(fp, "Uid [#]: %u\n", pw->pw_uid); 102 (void)fprintf(fp, "Gid [# or name]: %u\n", pw->pw_gid); 103 (void)fprintf(fp, "Change [month day year]: %s\n", 104 ttoa(chngstr, sizeof(chngstr), pw->pw_change)); 105 (void)fprintf(fp, "Expire [month day year]: %s\n", 106 ttoa(chngstr, sizeof(chngstr), pw->pw_expire)); 107 (void)fprintf(fp, "Class: %s\n", pw->pw_class); 108 (void)fprintf(fp, "Home directory: %s\n", pw->pw_dir); 109 (void)fprintf(fp, "Shell: %s\n", 110 *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL); 111 } 112 /* Only admin can change "restricted" shells. */ 113 else if (ok_shell(pw->pw_shell, NULL)) 114 /* 115 * Make shell a restricted field. Ugly with a 116 * necklace, but there's not much else to do. 117 */ 118 (void)fprintf(fp, "Shell: %s\n", 119 *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL); 120 else 121 list[E_SHELL].restricted = 1; 122 bp = pw->pw_gecos; 123 p = strsep(&bp, ","); 124 (void)fprintf(fp, "Full Name: %s\n", p ? p : ""); 125 p = strsep(&bp, ","); 126 (void)fprintf(fp, "Office Location: %s\n", p ? p : ""); 127 p = strsep(&bp, ","); 128 (void)fprintf(fp, "Office Phone: %s\n", p ? p : ""); 129 p = strsep(&bp, ","); 130 (void)fprintf(fp, "Home Phone: %s\n", p ? p : ""); 131 132 (void)fchown(fd, getuid(), getgid()); 133 (void)fclose(fp); 134 } 135 136 int 137 verify(char *tempname, struct passwd *pw) 138 { 139 unsigned int line; 140 size_t alen; 141 static char buf[LINE_MAX]; 142 struct stat sb; 143 char *p, *q; 144 ENTRY *ep; 145 FILE *fp; 146 int fd; 147 148 if ((fd = open(tempname, O_RDONLY|O_NOFOLLOW)) == -1 || 149 (fp = fdopen(fd, "r")) == NULL) 150 pw_error(tempname, 1, 1); 151 if (fstat(fd, &sb)) 152 pw_error(tempname, 1, 1); 153 if (sb.st_size == 0 || sb.st_nlink != 1 || sb.st_uid != uid) { 154 warnx("corrupted temporary file"); 155 goto bad; 156 } 157 line = 0; 158 while (fgets(buf, sizeof(buf), fp)) { 159 line++; 160 if (!buf[0] || buf[0] == '#') 161 continue; 162 if ((p = strchr(buf, '\n')) != NULL) 163 *p = '\0'; 164 else if (!feof(fp)) { 165 warnx("line %u too long", line); 166 goto bad; 167 } 168 for (ep = list;; ++ep) { 169 if (!ep->prompt) { 170 warnx("unrecognized field on line %u", line); 171 goto bad; 172 } 173 if (!strncasecmp(buf, ep->prompt, ep->len)) { 174 if (ep->restricted && uid) { 175 warnx( 176 "you may not change the %s field", 177 ep->prompt); 178 goto bad; 179 } 180 if (!(p = strchr(buf, ':'))) { 181 warnx("line %u corrupted", line); 182 goto bad; 183 } 184 while (isspace(*++p)); 185 for (q = p; isprint(*q); q++) { 186 if (ep->except && strchr(ep->except,*q)) 187 break; 188 } 189 if (*q) { 190 warnx( 191 "illegal character in the \"%s\" field", 192 ep->prompt); 193 goto bad; 194 } 195 if ((ep->func)(p, pw, ep)) { 196 bad: (void)fclose(fp); 197 return (0); 198 } 199 break; 200 } 201 } 202 } 203 (void)fclose(fp); 204 205 if (list[E_NAME].save == NULL) 206 list[E_NAME].save = ""; 207 if (list[E_BPHONE].save == NULL) 208 list[E_BPHONE].save = ""; 209 if (list[E_HPHONE].save == NULL) 210 list[E_HPHONE].save = ""; 211 if (list[E_LOCATE].save == NULL) 212 list[E_LOCATE].save = ""; 213 214 /* Build the gecos field. */ 215 for (alen = 0, p = list[E_NAME].save; *p; p++) 216 if (*p == '&') 217 alen = alen + strlen(pw->pw_name) - 1; 218 if (asprintf(&p, "%s,%s,%s,%s", list[E_NAME].save, 219 list[E_LOCATE].save, list[E_BPHONE].save, list[E_HPHONE].save) == -1) 220 err(1, NULL); 221 pw->pw_gecos = p; 222 223 if (snprintf(buf, sizeof(buf), 224 "%s:%s:%u:%u:%s:%ld:%ld:%s:%s:%s", 225 pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class, 226 (long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos, pw->pw_dir, 227 pw->pw_shell) >= 1023 || 228 strlen(buf) + alen >= 1023) { 229 warnx("entries too long"); 230 free(p); 231 return (0); 232 } 233 free(p); 234 235 return (pw_scan(buf, pw, NULL)); 236 } 237