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