Current Path : /compat/linux/proc/self/root/usr/src/lib/libutil/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //compat/linux/proc/self/root/usr/src/lib/libutil/pw_util.c |
/*- * Copyright (c) 1990, 1993, 1994 * The Regents of the University of California. All rights reserved. * Copyright (c) 2002 Networks Associates Technology, Inc. * All rights reserved. * * Portions of this software were developed for the FreeBSD Project by * ThinkSec AS and NAI Labs, the Security Research Division of Network * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 * ("CBOSS"), as part of the DARPA CHATS research program. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint #if 0 static const char sccsid[] = "@(#)pw_util.c 8.3 (Berkeley) 4/2/94"; #endif static const char rcsid[] = "$FreeBSD: release/9.1.0/lib/libutil/pw_util.c 237778 2012-06-29 13:00:28Z bapt $"; #endif /* not lint */ /* * This file is used by all the "password" programs; vipw(8), chpass(1), * and passwd(1). */ #include <sys/param.h> #include <sys/errno.h> #include <sys/time.h> #include <sys/resource.h> #include <sys/stat.h> #include <sys/wait.h> #include <ctype.h> #include <err.h> #include <fcntl.h> #include <inttypes.h> #include <libgen.h> #include <paths.h> #include <pwd.h> #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include "libutil.h" static pid_t editpid = -1; static int lockfd = -1; static char masterpasswd[PATH_MAX]; static char passwd_dir[PATH_MAX]; static char tempname[PATH_MAX]; static int initialized; #if 0 void pw_cont(int sig) { if (editpid != -1) kill(editpid, sig); } #endif /* * Initialize statics and set limits, signals & umask to try to avoid * interruptions, crashes etc. that might expose passord data. */ int pw_init(const char *dir, const char *master) { #if 0 struct rlimit rlim; #endif if (dir == NULL) { strcpy(passwd_dir, _PATH_ETC); } else { if (strlen(dir) >= sizeof(passwd_dir)) { errno = ENAMETOOLONG; return (-1); } strcpy(passwd_dir, dir); } if (master == NULL) { if (dir == NULL) { strcpy(masterpasswd, _PATH_MASTERPASSWD); } else if (snprintf(masterpasswd, sizeof(masterpasswd), "%s/%s", passwd_dir, _MASTERPASSWD) > (int)sizeof(masterpasswd)) { errno = ENAMETOOLONG; return (-1); } } else { if (strlen(master) >= sizeof(masterpasswd)) { errno = ENAMETOOLONG; return (-1); } strcpy(masterpasswd, master); } /* * The code that follows is extremely disruptive to the calling * process, and is therefore disabled until someone can conceive * of a realistic scenario where it would fend off a compromise. * Race conditions concerning the temporary files can be guarded * against in other ways than masking signals (by checking stat(2) * results after creation). */ #if 0 /* Unlimited resource limits. */ rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY; (void)setrlimit(RLIMIT_CPU, &rlim); (void)setrlimit(RLIMIT_FSIZE, &rlim); (void)setrlimit(RLIMIT_STACK, &rlim); (void)setrlimit(RLIMIT_DATA, &rlim); (void)setrlimit(RLIMIT_RSS, &rlim); /* Don't drop core (not really necessary, but GP's). */ rlim.rlim_cur = rlim.rlim_max = 0; (void)setrlimit(RLIMIT_CORE, &rlim); /* Turn off signals. */ (void)signal(SIGALRM, SIG_IGN); (void)signal(SIGHUP, SIG_IGN); (void)signal(SIGINT, SIG_IGN); (void)signal(SIGPIPE, SIG_IGN); (void)signal(SIGQUIT, SIG_IGN); (void)signal(SIGTERM, SIG_IGN); (void)signal(SIGCONT, pw_cont); /* Create with exact permissions. */ (void)umask(0); #endif initialized = 1; return (0); } /* * Lock the master password file. */ int pw_lock(void) { if (*masterpasswd == '\0') return (-1); /* * If the master password file doesn't exist, the system is hosed. * Might as well try to build one. Set the close-on-exec bit so * that users can't get at the encrypted passwords while editing. * Open should allow flock'ing the file; see 4.4BSD. XXX */ for (;;) { struct stat st; lockfd = open(masterpasswd, O_RDONLY, 0); if (lockfd < 0 || fcntl(lockfd, F_SETFD, 1) == -1) err(1, "%s", masterpasswd); /* XXX vulnerable to race conditions */ if (flock(lockfd, LOCK_EX|LOCK_NB) == -1) { if (errno == EWOULDBLOCK) { errx(1, "the password db file is busy"); } else { err(1, "could not lock the passwd file: "); } } /* * If the password file was replaced while we were trying to * get the lock, our hardlink count will be 0 and we have to * close and retry. */ if (fstat(lockfd, &st) == -1) err(1, "fstat() failed: "); if (st.st_nlink != 0) break; close(lockfd); lockfd = -1; } return (lockfd); } /* * Create and open a presumably safe temp file for editing the password * data, and copy the master password file into it. */ int pw_tmp(int mfd) { char buf[8192]; ssize_t nr; const char *p; int tfd; if (*masterpasswd == '\0') return (-1); if ((p = strrchr(masterpasswd, '/'))) ++p; else p = masterpasswd; if (snprintf(tempname, sizeof(tempname), "%.*spw.XXXXXX", (int)(p - masterpasswd), masterpasswd) >= (int)sizeof(tempname)) { errno = ENAMETOOLONG; return (-1); } if ((tfd = mkstemp(tempname)) == -1) return (-1); if (mfd != -1) { while ((nr = read(mfd, buf, sizeof(buf))) > 0) if (write(tfd, buf, (size_t)nr) != nr) break; if (nr != 0) { unlink(tempname); *tempname = '\0'; close(tfd); return (-1); } } return (tfd); } /* * Regenerate the password database. */ int pw_mkdb(const char *user) { int pstat; pid_t pid; (void)fflush(stderr); switch ((pid = fork())) { case -1: return (-1); case 0: /* child */ if (user == NULL) execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", "-d", passwd_dir, tempname, (char *)NULL); else execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", "-d", passwd_dir, "-u", user, tempname, (char *)NULL); _exit(1); /* NOTREACHED */ default: /* parent */ break; } if (waitpid(pid, &pstat, 0) == -1) return (-1); if (WIFEXITED(pstat) && WEXITSTATUS(pstat) == 0) return (0); errno = 0; return (-1); } /* * Edit the temp file. Return -1 on error, >0 if the file was modified, 0 * if it was not. */ int pw_edit(int notsetuid) { struct sigaction sa, sa_int, sa_quit; sigset_t oldsigset, nsigset; struct stat st1, st2; const char *editor; int pstat; if ((editor = getenv("EDITOR")) == NULL) editor = _PATH_VI; if (stat(tempname, &st1) == -1) return (-1); sa.sa_handler = SIG_IGN; sigemptyset(&sa.sa_mask); sa.sa_flags = 0; sigaction(SIGINT, &sa, &sa_int); sigaction(SIGQUIT, &sa, &sa_quit); sigemptyset(&nsigset); sigaddset(&nsigset, SIGCHLD); sigprocmask(SIG_BLOCK, &nsigset, &oldsigset); switch ((editpid = fork())) { case -1: return (-1); case 0: sigaction(SIGINT, &sa_int, NULL); sigaction(SIGQUIT, &sa_quit, NULL); sigprocmask(SIG_SETMASK, &oldsigset, NULL); if (notsetuid) { (void)setgid(getgid()); (void)setuid(getuid()); } errno = 0; execlp(editor, basename(editor), tempname, (char *)NULL); _exit(errno); default: /* parent */ break; } for (;;) { if (waitpid(editpid, &pstat, WUNTRACED) == -1) { if (errno == EINTR) continue; unlink(tempname); editpid = -1; break; } else if (WIFSTOPPED(pstat)) { raise(WSTOPSIG(pstat)); } else if (WIFEXITED(pstat) && WEXITSTATUS(pstat) == 0) { editpid = -1; break; } else { unlink(tempname); editpid = -1; break; } } sigaction(SIGINT, &sa_int, NULL); sigaction(SIGQUIT, &sa_quit, NULL); sigprocmask(SIG_SETMASK, &oldsigset, NULL); if (stat(tempname, &st2) == -1) return (-1); return (st1.st_mtime != st2.st_mtime); } /* * Clean up. Preserve errno for the caller's convenience. */ void pw_fini(void) { int serrno, status; if (!initialized) return; initialized = 0; serrno = errno; if (editpid != -1) { kill(editpid, SIGTERM); kill(editpid, SIGCONT); waitpid(editpid, &status, 0); editpid = -1; } if (*tempname != '\0') { unlink(tempname); *tempname = '\0'; } if (lockfd != -1) close(lockfd); errno = serrno; } /* * Compares two struct pwds. */ int pw_equal(const struct passwd *pw1, const struct passwd *pw2) { return (strcmp(pw1->pw_name, pw2->pw_name) == 0 && pw1->pw_uid == pw2->pw_uid && pw1->pw_gid == pw2->pw_gid && strcmp(pw1->pw_class, pw2->pw_class) == 0 && pw1->pw_change == pw2->pw_change && pw1->pw_expire == pw2->pw_expire && strcmp(pw1->pw_gecos, pw2->pw_gecos) == 0 && strcmp(pw1->pw_dir, pw2->pw_dir) == 0 && strcmp(pw1->pw_shell, pw2->pw_shell) == 0); } /* * Make a passwd line out of a struct passwd. */ char * pw_make(const struct passwd *pw) { char *line; asprintf(&line, "%s:%s:%ju:%ju:%s:%ju:%ju:%s:%s:%s", pw->pw_name, pw->pw_passwd, (uintmax_t)pw->pw_uid, (uintmax_t)pw->pw_gid, pw->pw_class, (uintmax_t)pw->pw_change, (uintmax_t)pw->pw_expire, pw->pw_gecos, pw->pw_dir, pw->pw_shell); return (line); } /* * Make a passwd line (in v7 format) out of a struct passwd */ char * pw_make_v7(const struct passwd *pw) { char *line; asprintf(&line, "%s:*:%ju:%ju:%s:%s:%s", pw->pw_name, (uintmax_t)pw->pw_uid, (uintmax_t)pw->pw_gid, pw->pw_gecos, pw->pw_dir, pw->pw_shell); return (line); } /* * Copy password file from one descriptor to another, replacing, deleting * or adding a single record on the way. */ int pw_copy(int ffd, int tfd, const struct passwd *pw, struct passwd *old_pw) { char buf[8192], *end, *line, *p, *q, *r, t; struct passwd *fpw; const struct passwd *spw; size_t len; int eof, readlen; if (old_pw == NULL && pw == NULL) return (-1); spw = old_pw; /* deleting a user */ if (pw == NULL) { line = NULL; } else { if ((line = pw_make(pw)) == NULL) return (-1); } /* adding a user */ if (spw == NULL) spw = pw; eof = 0; len = 0; p = q = end = buf; for (;;) { /* find the end of the current line */ for (p = q; q < end && *q != '\0'; ++q) if (*q == '\n') break; /* if we don't have a complete line, fill up the buffer */ if (q >= end) { if (eof) break; if ((size_t)(q - p) >= sizeof(buf)) { warnx("passwd line too long"); errno = EINVAL; /* hack */ goto err; } if (p < end) { q = memmove(buf, p, end - p); end -= p - buf; } else { p = q = end = buf; } readlen = read(ffd, end, sizeof(buf) - (end - buf)); if (readlen == -1) goto err; else len = (size_t)readlen; if (len == 0 && p == buf) break; end += len; len = end - buf; if (len < (ssize_t)sizeof(buf)) { eof = 1; if (len > 0 && buf[len - 1] != '\n') ++len, *end++ = '\n'; } continue; } /* is it a blank line or a comment? */ for (r = p; r < q && isspace(*r); ++r) /* nothing */ ; if (r == q || *r == '#') { /* yep */ if (write(tfd, p, q - p + 1) != q - p + 1) goto err; ++q; continue; } /* is it the one we're looking for? */ t = *q; *q = '\0'; fpw = pw_scan(r, PWSCAN_MASTER); /* * fpw is either the struct passwd for the current line, * or NULL if the line is malformed. */ *q = t; if (fpw == NULL || strcmp(fpw->pw_name, spw->pw_name) != 0) { /* nope */ if (fpw != NULL) free(fpw); if (write(tfd, p, q - p + 1) != q - p + 1) goto err; ++q; continue; } if (old_pw && !pw_equal(fpw, old_pw)) { warnx("entry inconsistent"); free(fpw); errno = EINVAL; /* hack */ goto err; } free(fpw); /* it is, replace or remove it */ if (line != NULL) { len = strlen(line); if (write(tfd, line, len) != (int)len) goto err; } else { /* when removed, avoid the \n */ q++; } /* we're done, just copy the rest over */ for (;;) { if (write(tfd, q, end - q) != end - q) goto err; q = buf; readlen = read(ffd, buf, sizeof(buf)); if (readlen == 0) break; else len = (size_t)readlen; if (readlen == -1) goto err; end = buf + len; } goto done; } /* if we got here, we didn't find the old entry */ if (line == NULL) { errno = ENOENT; goto err; } len = strlen(line); if ((size_t)write(tfd, line, len) != len || write(tfd, "\n", 1) != 1) goto err; done: if (line != NULL) free(line); return (0); err: if (line != NULL) free(line); return (-1); } /* * Return the current value of tempname. */ const char * pw_tempname(void) { return (tempname); } /* * Duplicate a struct passwd. */ struct passwd * pw_dup(const struct passwd *pw) { char *dst; struct passwd *npw; ssize_t len; len = sizeof(*npw); if (pw->pw_name != NULL) len += strlen(pw->pw_name) + 1; if (pw->pw_passwd != NULL) len += strlen(pw->pw_passwd) + 1; if (pw->pw_class != NULL) len += strlen(pw->pw_class) + 1; if (pw->pw_gecos != NULL) len += strlen(pw->pw_gecos) + 1; if (pw->pw_dir != NULL) len += strlen(pw->pw_dir) + 1; if (pw->pw_shell != NULL) len += strlen(pw->pw_shell) + 1; if ((npw = malloc((size_t)len)) == NULL) return (NULL); memcpy(npw, pw, sizeof(*npw)); dst = (char *)npw + sizeof(*npw); if (pw->pw_name != NULL) { npw->pw_name = dst; dst = stpcpy(npw->pw_name, pw->pw_name) + 1; } if (pw->pw_passwd != NULL) { npw->pw_passwd = dst; dst = stpcpy(npw->pw_passwd, pw->pw_passwd) + 1; } if (pw->pw_class != NULL) { npw->pw_class = dst; dst = stpcpy(npw->pw_class, pw->pw_class) + 1; } if (pw->pw_gecos != NULL) { npw->pw_gecos = dst; dst = stpcpy(npw->pw_gecos, pw->pw_gecos) + 1; } if (pw->pw_dir != NULL) { npw->pw_dir = dst; dst = stpcpy(npw->pw_dir, pw->pw_dir) + 1; } if (pw->pw_shell != NULL) { npw->pw_shell = dst; dst = stpcpy(npw->pw_shell, pw->pw_shell) + 1; } return (npw); } #include "pw_scan.h" /* * Wrapper around an internal libc function */ struct passwd * pw_scan(const char *line, int flags) { struct passwd pw, *ret; char *bp; if ((bp = strdup(line)) == NULL) return (NULL); if (!__pw_scan(bp, &pw, flags)) { free(bp); return (NULL); } ret = pw_dup(&pw); free(bp); return (ret); }