1 /*- 2 * Copyright (c) 1990, 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 #if 0 36 static const char sccsid[] = "@(#)pw_util.c 8.3 (Berkeley) 4/2/94"; 37 #endif 38 static const char rcsid[] = 39 "$Id: pw_util.c,v 1.10 1998/10/13 14:52:33 des Exp $"; 40 #endif /* not lint */ 41 42 /* 43 * This file is used by all the "password" programs; vipw(8), chpass(1), 44 * and passwd(1). 45 */ 46 47 #include <sys/param.h> 48 #include <sys/errno.h> 49 #include <sys/time.h> 50 #include <sys/resource.h> 51 #include <sys/stat.h> 52 #include <sys/wait.h> 53 54 #include <err.h> 55 #include <fcntl.h> 56 #include <paths.h> 57 #include <pwd.h> 58 #include <signal.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <unistd.h> 63 64 #include "pw_util.h" 65 66 extern char *tempname; 67 static pid_t editpid = -1; 68 static int lockfd; 69 70 void 71 pw_cont(sig) 72 int sig; 73 { 74 75 if (editpid != -1) 76 kill(editpid, sig); 77 } 78 79 void 80 pw_init() 81 { 82 struct rlimit rlim; 83 84 /* Unlimited resource limits. */ 85 rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY; 86 (void)setrlimit(RLIMIT_CPU, &rlim); 87 (void)setrlimit(RLIMIT_FSIZE, &rlim); 88 (void)setrlimit(RLIMIT_STACK, &rlim); 89 (void)setrlimit(RLIMIT_DATA, &rlim); 90 (void)setrlimit(RLIMIT_RSS, &rlim); 91 92 /* Don't drop core (not really necessary, but GP's). */ 93 rlim.rlim_cur = rlim.rlim_max = 0; 94 (void)setrlimit(RLIMIT_CORE, &rlim); 95 96 /* Turn off signals. */ 97 (void)signal(SIGALRM, SIG_IGN); 98 (void)signal(SIGHUP, SIG_IGN); 99 (void)signal(SIGINT, SIG_IGN); 100 (void)signal(SIGPIPE, SIG_IGN); 101 (void)signal(SIGQUIT, SIG_IGN); 102 (void)signal(SIGTERM, SIG_IGN); 103 (void)signal(SIGCONT, pw_cont); 104 105 /* Create with exact permissions. */ 106 (void)umask(0); 107 } 108 109 int 110 pw_lock() 111 { 112 /* 113 * If the master password file doesn't exist, the system is hosed. 114 * Might as well try to build one. Set the close-on-exec bit so 115 * that users can't get at the encrypted passwords while editing. 116 * Open should allow flock'ing the file; see 4.4BSD. XXX 117 */ 118 lockfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0); 119 if (lockfd < 0 || fcntl(lockfd, F_SETFD, 1) == -1) 120 err(1, "%s", _PATH_MASTERPASSWD); 121 if (flock(lockfd, LOCK_EX|LOCK_NB)) 122 errx(1, "the password db file is busy"); 123 return (lockfd); 124 } 125 126 int 127 pw_tmp() 128 { 129 static char path[MAXPATHLEN] = _PATH_MASTERPASSWD; 130 int fd; 131 char *p; 132 133 if ((p = strrchr(path, '/'))) 134 ++p; 135 else 136 p = path; 137 strcpy(p, "pw.XXXXXX"); 138 if ((fd = mkstemp(path)) == -1) 139 err(1, "%s", path); 140 tempname = path; 141 return (fd); 142 } 143 144 int 145 pw_mkdb(username) 146 char *username; 147 { 148 int pstat; 149 pid_t pid; 150 151 (void)fflush(stderr); 152 if (!(pid = fork())) { 153 if(!username) { 154 warnx("rebuilding the database..."); 155 execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", tempname, NULL); 156 } else { 157 warnx("updating the database..."); 158 execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", "-u", 159 username, tempname, NULL); 160 } 161 pw_error(_PATH_PWD_MKDB, 1, 1); 162 } 163 pid = waitpid(pid, &pstat, 0); 164 if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0) 165 return (0); 166 warnx("done"); 167 return (1); 168 } 169 170 void 171 pw_edit(notsetuid) 172 int notsetuid; 173 { 174 int pstat; 175 char *p, *editor; 176 177 if (!(editor = getenv("EDITOR"))) 178 editor = _PATH_VI; 179 if ((p = strrchr(editor, '/'))) 180 ++p; 181 else 182 p = editor; 183 184 if (!(editpid = fork())) { 185 if (notsetuid) { 186 (void)setgid(getgid()); 187 (void)setuid(getuid()); 188 } 189 errno = 0; 190 execlp(editor, p, tempname, NULL); 191 _exit(errno); 192 } 193 for (;;) { 194 editpid = waitpid(editpid, (int *)&pstat, WUNTRACED); 195 errno = WEXITSTATUS(pstat); 196 if (editpid == -1) 197 pw_error(editor, 1, 1); 198 else if (WIFSTOPPED(pstat)) 199 raise(WSTOPSIG(pstat)); 200 else if (WIFEXITED(pstat) && errno == 0) 201 break; 202 else 203 pw_error(editor, 1, 1); 204 } 205 editpid = -1; 206 } 207 208 void 209 pw_prompt() 210 { 211 int c, first; 212 213 (void)printf("re-edit the password file? [y]: "); 214 (void)fflush(stdout); 215 first = c = getchar(); 216 while (c != '\n' && c != EOF) 217 c = getchar(); 218 if (first == 'n') 219 pw_error(NULL, 0, 0); 220 } 221 222 void 223 pw_error(name, err, eval) 224 char *name; 225 int err, eval; 226 { 227 #ifdef YP 228 extern int _use_yp; 229 #endif /* YP */ 230 if (err) 231 warn(name); 232 #ifdef YP 233 if (_use_yp) 234 warnx("NIS information unchanged"); 235 else 236 #endif /* YP */ 237 warnx("%s: unchanged", _PATH_MASTERPASSWD); 238 (void)unlink(tempname); 239 exit(eval); 240 } 241