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