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 "$FreeBSD$"; 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 char *mppath = _PATH_PWD; 70 char *masterpasswd = _PATH_MASTERPASSWD; 71 72 void 73 pw_cont(sig) 74 int sig; 75 { 76 77 if (editpid != -1) 78 kill(editpid, sig); 79 } 80 81 void 82 pw_init() 83 { 84 struct rlimit rlim; 85 86 /* Unlimited resource limits. */ 87 rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY; 88 (void)setrlimit(RLIMIT_CPU, &rlim); 89 (void)setrlimit(RLIMIT_FSIZE, &rlim); 90 (void)setrlimit(RLIMIT_STACK, &rlim); 91 (void)setrlimit(RLIMIT_DATA, &rlim); 92 (void)setrlimit(RLIMIT_RSS, &rlim); 93 94 /* Don't drop core (not really necessary, but GP's). */ 95 rlim.rlim_cur = rlim.rlim_max = 0; 96 (void)setrlimit(RLIMIT_CORE, &rlim); 97 98 /* Turn off signals. */ 99 (void)signal(SIGALRM, SIG_IGN); 100 (void)signal(SIGHUP, SIG_IGN); 101 (void)signal(SIGINT, SIG_IGN); 102 (void)signal(SIGPIPE, SIG_IGN); 103 (void)signal(SIGQUIT, SIG_IGN); 104 (void)signal(SIGTERM, SIG_IGN); 105 (void)signal(SIGCONT, pw_cont); 106 107 /* Create with exact permissions. */ 108 (void)umask(0); 109 } 110 111 int 112 pw_lock() 113 { 114 /* 115 * If the master password file doesn't exist, the system is hosed. 116 * Might as well try to build one. Set the close-on-exec bit so 117 * that users can't get at the encrypted passwords while editing. 118 * Open should allow flock'ing the file; see 4.4BSD. XXX 119 */ 120 for (;;) { 121 struct stat st; 122 123 lockfd = open(masterpasswd, O_RDONLY, 0); 124 if (lockfd < 0 || fcntl(lockfd, F_SETFD, 1) == -1) 125 err(1, "%s", masterpasswd); 126 if (flock(lockfd, LOCK_EX|LOCK_NB)) 127 errx(1, "the password db file is busy"); 128 129 /* 130 * If the password file was replaced while we were trying to 131 * get the lock, our hardlink count will be 0 and we have to 132 * close and retry. 133 */ 134 if (fstat(lockfd, &st) < 0) 135 errx(1, "fstat() failed"); 136 if (st.st_nlink != 0) 137 break; 138 close(lockfd); 139 lockfd = -1; 140 } 141 return (lockfd); 142 } 143 144 int 145 pw_tmp() 146 { 147 static char path[MAXPATHLEN]; 148 int fd; 149 char *p; 150 151 strncpy(path, masterpasswd, MAXPATHLEN - 1); 152 path[MAXPATHLEN] = '\0'; 153 154 if ((p = strrchr(path, '/'))) 155 ++p; 156 else 157 p = path; 158 strcpy(p, "pw.XXXXXX"); 159 if ((fd = mkstemp(path)) == -1) 160 err(1, "%s", path); 161 tempname = path; 162 return (fd); 163 } 164 165 int 166 pw_mkdb(username) 167 char *username; 168 { 169 int pstat; 170 pid_t pid; 171 172 (void)fflush(stderr); 173 if (!(pid = fork())) { 174 if(!username) { 175 warnx("rebuilding the database..."); 176 execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", "-d", mppath, 177 tempname, NULL); 178 } else { 179 warnx("updating the database..."); 180 execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", "-d", mppath, 181 "-u", username, tempname, NULL); 182 } 183 pw_error(_PATH_PWD_MKDB, 1, 1); 184 } 185 pid = waitpid(pid, &pstat, 0); 186 if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0) 187 return (0); 188 warnx("done"); 189 return (1); 190 } 191 192 void 193 pw_edit(notsetuid) 194 int notsetuid; 195 { 196 int pstat; 197 char *p, *editor; 198 199 if (!(editor = getenv("EDITOR"))) 200 editor = _PATH_VI; 201 if ((p = strrchr(editor, '/'))) 202 ++p; 203 else 204 p = editor; 205 206 if (!(editpid = fork())) { 207 if (notsetuid) { 208 (void)setgid(getgid()); 209 (void)setuid(getuid()); 210 } 211 errno = 0; 212 execlp(editor, p, tempname, NULL); 213 _exit(errno); 214 } 215 for (;;) { 216 editpid = waitpid(editpid, (int *)&pstat, WUNTRACED); 217 errno = WEXITSTATUS(pstat); 218 if (editpid == -1) 219 pw_error(editor, 1, 1); 220 else if (WIFSTOPPED(pstat)) 221 raise(WSTOPSIG(pstat)); 222 else if (WIFEXITED(pstat) && errno == 0) 223 break; 224 else 225 pw_error(editor, 1, 1); 226 } 227 editpid = -1; 228 } 229 230 void 231 pw_prompt() 232 { 233 int c, first; 234 235 (void)printf("re-edit the password file? [y]: "); 236 (void)fflush(stdout); 237 first = c = getchar(); 238 while (c != '\n' && c != EOF) 239 c = getchar(); 240 if (first == 'n') 241 pw_error(NULL, 0, 0); 242 } 243 244 void 245 pw_error(name, err, eval) 246 char *name; 247 int err, eval; 248 { 249 #ifdef YP 250 extern int _use_yp; 251 #endif /* YP */ 252 if (err) 253 warn(name); 254 #ifdef YP 255 if (_use_yp) 256 warnx("NIS information unchanged"); 257 else 258 #endif /* YP */ 259 warnx("%s: unchanged", masterpasswd); 260 (void)unlink(tempname); 261 exit(eval); 262 } 263