passwd.c revision 1.3
1 /* 2 * Copyright (c) 1987, 1993, 1994, 1995 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 #if defined(LIBC_SCCS) && !defined(lint) 35 static char rcsid[] = "$NetBSD: passwd.c,v 1.3 1996/12/09 22:23:34 thorpej Exp $"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <sys/types.h> 39 #include <sys/stat.h> 40 #include <sys/time.h> 41 #include <sys/resource.h> 42 #include <sys/wait.h> 43 44 #include <ctype.h> 45 #include <fcntl.h> 46 #include <unistd.h> 47 #include <stdlib.h> 48 #include <stdio.h> 49 #include <string.h> 50 #include <pwd.h> 51 #include <errno.h> 52 #include <paths.h> 53 #include <signal.h> 54 #include <limits.h> 55 #include <util.h> 56 57 static void pw_cont __P((int sig)); 58 59 int 60 pw_lock(retries) 61 int retries; 62 { 63 int i, fd; 64 mode_t old_mode; 65 66 /* Acquire the lock file. */ 67 old_mode = umask(0); 68 fd = open(_PATH_MASTERPASSWD_LOCK, O_WRONLY|O_CREAT|O_EXCL, 0600); 69 for (i = 0; i < retries && fd < 0 && errno == EEXIST; i++) { 70 sleep(1); 71 fd = open(_PATH_MASTERPASSWD_LOCK, O_WRONLY|O_CREAT|O_EXCL, 72 0600); 73 } 74 umask(old_mode); 75 return(fd); 76 } 77 78 int 79 pw_mkdb() 80 { 81 int pstat; 82 pid_t pid; 83 84 pid = vfork(); 85 if (pid == 0) { 86 execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", 87 _PATH_MASTERPASSWD_LOCK, NULL); 88 exit(1); 89 } 90 pid = waitpid(pid, &pstat, 0); 91 if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0) 92 return(-1); 93 return(0); 94 } 95 96 int 97 pw_abort() 98 { 99 return(unlink(_PATH_MASTERPASSWD_LOCK)); 100 } 101 102 /* Everything below this point is intended for the convenience of programs 103 * which allow a user to interactively edit the passwd file. Errors in the 104 * routines below will cause the process to abort. */ 105 106 static pid_t editpid = -1; 107 108 static void 109 pw_cont(sig) 110 int sig; 111 { 112 113 if (editpid != -1) 114 kill(editpid, sig); 115 } 116 117 void 118 pw_init() 119 { 120 struct rlimit rlim; 121 122 /* Unlimited resource limits. */ 123 rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY; 124 (void)setrlimit(RLIMIT_CPU, &rlim); 125 (void)setrlimit(RLIMIT_FSIZE, &rlim); 126 (void)setrlimit(RLIMIT_STACK, &rlim); 127 (void)setrlimit(RLIMIT_DATA, &rlim); 128 (void)setrlimit(RLIMIT_RSS, &rlim); 129 130 /* Don't drop core (not really necessary, but GP's). */ 131 rlim.rlim_cur = rlim.rlim_max = 0; 132 (void)setrlimit(RLIMIT_CORE, &rlim); 133 134 /* Turn off signals. */ 135 (void)signal(SIGALRM, SIG_IGN); 136 (void)signal(SIGHUP, SIG_IGN); 137 (void)signal(SIGINT, SIG_IGN); 138 (void)signal(SIGPIPE, SIG_IGN); 139 (void)signal(SIGQUIT, SIG_IGN); 140 (void)signal(SIGTERM, SIG_IGN); 141 (void)signal(SIGCONT, pw_cont); 142 } 143 144 void 145 pw_edit(notsetuid, filename) 146 int notsetuid; 147 const char *filename; 148 { 149 int i, j, xargc, pstat; 150 char *p, *editor; 151 char **xargv; 152 153 if (filename == NULL) 154 filename = _PATH_MASTERPASSWD_LOCK; 155 if ((editor = getenv("EDITOR")) == NULL) 156 editor = strdup(_PATH_VI); 157 else 158 editor = strdup(editor); 159 if (p = strrchr(editor, '/')) 160 ++p; 161 else 162 p = editor; 163 164 /* Scan editor string, count spaces, allocate arg vector. */ 165 for (i = 0, xargc = 0; p[i] != '\0'; i++) { 166 if (isspace(p[i])) { 167 while (isspace(p[i++])) 168 /* skip white space */ ; 169 if (p[i] == '\0') 170 break; 171 xargc++; 172 } 173 } 174 175 /* argv[0] + <xargc args> + filename + NULL */ 176 xargv = (char **)malloc(sizeof(char *) * (xargc + 3)); 177 if (xargv == NULL) 178 pw_error("malloc failed", 1, 1); 179 180 i = 0; 181 xargv[i++] = p; 182 for (; *p != '\0'; p++) { 183 if (isspace(*p)) { 184 while(isspace(*p)) 185 *p++ = '\0'; /* blast whitespace */ 186 if (*p == '\0') 187 break; 188 xargv[i++] = p; 189 } 190 } 191 192 xargv[i++] = (char *)filename; 193 xargv[i] = NULL; 194 195 if (!(editpid = vfork())) { 196 if (notsetuid) { 197 setgid(getgid()); 198 setuid(getuid()); 199 } 200 execvp(editor, xargv); 201 _exit(1); 202 } 203 for (;;) { 204 editpid = waitpid(editpid, (int *)&pstat, WUNTRACED); 205 if (editpid == -1) 206 pw_error(editor, 1, 1); 207 else if (WIFSTOPPED(pstat)) 208 raise(WSTOPSIG(pstat)); 209 else if (WIFEXITED(pstat) && WEXITSTATUS(pstat) == 0) 210 break; 211 else 212 pw_error(editor, 1, 1); 213 } 214 editpid = -1; 215 free(editor); 216 free(xargv); 217 } 218 219 void 220 pw_prompt() 221 { 222 int c; 223 224 (void)printf("re-edit the password file? [y]: "); 225 (void)fflush(stdout); 226 c = getchar(); 227 if (c != EOF && c != '\n') 228 while (getchar() != '\n'); 229 if (c == 'n') 230 pw_error(NULL, 0, 0); 231 } 232 233 void 234 pw_copy(ffd, tfd, pw) 235 int ffd, tfd; 236 struct passwd *pw; 237 { 238 FILE *from, *to; 239 int done; 240 char *p, buf[8192]; 241 242 if (!(from = fdopen(ffd, "r"))) 243 pw_error(_PATH_MASTERPASSWD, 1, 1); 244 if (!(to = fdopen(tfd, "w"))) 245 pw_error(_PATH_MASTERPASSWD_LOCK, 1, 1); 246 247 for (done = 0; fgets(buf, sizeof(buf), from);) { 248 if (!strchr(buf, '\n')) { 249 warnx("%s: line too long", _PATH_MASTERPASSWD); 250 pw_error(NULL, 0, 1); 251 } 252 if (done) { 253 (void)fprintf(to, "%s", buf); 254 if (ferror(to)) 255 goto err; 256 continue; 257 } 258 if (!(p = strchr(buf, ':'))) { 259 warnx("%s: corrupted entry", _PATH_MASTERPASSWD); 260 pw_error(NULL, 0, 1); 261 } 262 *p = '\0'; 263 if (strcmp(buf, pw->pw_name)) { 264 *p = ':'; 265 (void)fprintf(to, "%s", buf); 266 if (ferror(to)) 267 goto err; 268 continue; 269 } 270 (void)fprintf(to, "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", 271 pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, 272 pw->pw_class, pw->pw_change, pw->pw_expire, pw->pw_gecos, 273 pw->pw_dir, pw->pw_shell); 274 done = 1; 275 if (ferror(to)) 276 goto err; 277 } 278 if (!done) 279 (void)fprintf(to, "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", 280 pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, 281 pw->pw_class, pw->pw_change, pw->pw_expire, pw->pw_gecos, 282 pw->pw_dir, pw->pw_shell); 283 284 if (ferror(to)) 285 err: pw_error(NULL, 1, 1); 286 (void)fclose(to); 287 } 288 289 int 290 pw_scan(bp, pw, flags) 291 char *bp; 292 struct passwd *pw; 293 int *flags; 294 { 295 long id; 296 int root; 297 char *p, *sh; 298 299 if (flags != (int *)NULL) 300 *flags = 0; 301 302 if (!(pw->pw_name = strsep(&bp, ":"))) /* login */ 303 goto fmt; 304 root = !strcmp(pw->pw_name, "root"); 305 306 if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */ 307 goto fmt; 308 309 if (!(p = strsep(&bp, ":"))) /* uid */ 310 goto fmt; 311 id = atol(p); 312 if (root && id) { 313 warnx("root uid should be 0"); 314 return (0); 315 } 316 if (id > USHRT_MAX) { 317 warnx("%s > max uid value (%d)", p, USHRT_MAX); 318 return (0); 319 } 320 pw->pw_uid = id; 321 if ((*p == '\0') && (flags != (int *)NULL)) 322 *flags |= _PASSWORD_NOUID; 323 324 if (!(p = strsep(&bp, ":"))) /* gid */ 325 goto fmt; 326 id = atol(p); 327 if (id > USHRT_MAX) { 328 warnx("%s > max gid value (%d)", p, USHRT_MAX); 329 return (0); 330 } 331 pw->pw_gid = id; 332 if ((*p == '\0') && (flags != (int *)NULL)) 333 *flags |= _PASSWORD_NOGID; 334 335 pw->pw_class = strsep(&bp, ":"); /* class */ 336 if (!(p = strsep(&bp, ":"))) /* change */ 337 goto fmt; 338 pw->pw_change = atol(p); 339 if ((*p == '\0') && (flags != (int *)NULL)) 340 *flags |= _PASSWORD_NOCHG; 341 if (!(p = strsep(&bp, ":"))) /* expire */ 342 goto fmt; 343 pw->pw_expire = atol(p); 344 if ((*p == '\0') && (flags != (int *)NULL)) 345 *flags |= _PASSWORD_NOEXP; 346 pw->pw_gecos = strsep(&bp, ":"); /* gecos */ 347 pw->pw_dir = strsep(&bp, ":"); /* directory */ 348 if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */ 349 goto fmt; 350 351 p = pw->pw_shell; 352 if (root && *p) /* empty == /bin/sh */ 353 for (setusershell();;) { 354 if (!(sh = getusershell())) { 355 warnx("warning, unknown root shell"); 356 break; 357 } 358 if (!strcmp(p, sh)) 359 break; 360 } 361 362 if (p = strsep(&bp, ":")) { /* too many */ 363 fmt: warnx("corrupted entry"); 364 return (0); 365 } 366 367 return (1); 368 } 369 370 void 371 pw_error(name, err, eval) 372 const char *name; 373 int err, eval; 374 { 375 if (err) 376 warn(name); 377 378 warnx("%s: unchanged", _PATH_MASTERPASSWD); 379 pw_abort(); 380 exit(eval); 381 } 382 383
Indexes created Tue Sep 23 22:09:46 GMT 2025