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/* Copyright 1988,1990,1993,1994 by Paul Vixie
* All rights reserved
*
* Distribute freely, except: don't remove my name from the source or
* documentation (don't take credit for my work), mark your changes (don't
* get me blamed for your possible bugs), don't alter or remove this
* notice. May be sold if buildable source is provided to buyer. No
* warrantee of any kind, express or implied, is included with this
* software; use at your own risk, responsibility for damages (if any) to
* anyone resulting from the use of this software rests entirely with the
* user.
*
* Send bug reports, bug fixes, enhancements, requests, flames, etc., and
* I'll try to keep a version up to date. I can be reached as follows:
* Paul Vixie <paul@vix.com> uunet!decwrl!vixie!paul
*/
#if !defined(lint) && !defined(LINT)
static char rcsid[] = "$Id: crontab.c,v 2.13 1994/01/17 03:20:37 vixie Exp $";
#endif
/* crontab - install and manage per-user crontab files
* vix 02may87 [RCS has the rest of the log]
* vix 26jan87 [original]
*/
#define MAIN_PROGRAM
#include "cron.h"
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/file.h>
#include <sys/stat.h>
#ifdef USE_UTIMES
# include <sys/time.h>
#else
# include <time.h>
# include <utime.h>
#endif
#if defined(POSIX)
# include <locale.h>
#endif
#define NHEADER_LINES 3
enum opt_t { opt_unknown, opt_list, opt_delete, opt_edit, opt_replace };
#if DEBUGGING
static char *Options[] = { "???", "list", "delete", "edit", "replace" };
#endif
static PID_T Pid;
static char *User, *RealUser;
static char Filename[MAX_FNAME];
static char Directory[MAX_FNAME];
static FILE *NewCrontab = NULL;
static int CheckErrorCount;
static int PromptOnDelete;
static enum opt_t Option;
static struct passwd *pw;
static void list_cmd __P((void)),
delete_cmd __P((void)),
edit_cmd __P((void)),
poke_daemon __P((void)),
check_error __P((char *)),
parse_args __P((int c, char *v[]));
static int replace_cmd __P((void));
/* Support edit command */
static int create_tmp_crontab __P((void));
static int open_tmp_crontab __P((struct stat *fsbuf));
static void cleanup_tmp_crontab __P((void));
static void
usage(msg)
char *msg;
{
fprintf(stderr, "%s: usage error: %s\n", ProgramName, msg);
fprintf(stderr, "usage:\t%s [-u user] file\n", ProgramName);
fprintf(stderr, "\t%s [-u user] { -e | -l | -r }\n", ProgramName);
fprintf(stderr, "\t\t(default operation is replace, per 1003.2)\n");
fprintf(stderr, "\t-e\t(edit user's crontab)\n");
fprintf(stderr, "\t-l\t(list user's crontab)\n");
fprintf(stderr, "\t-r\t(delete user's crontab)\n");
fprintf(stderr, "\t-i\t(prompt before deleting user's crontab)\n");
exit(ERROR_EXIT);
}
int
main(argc, argv)
int argc;
char *argv[];
{
int exitstatus;
Pid = getpid();
ProgramName = argv[0];
#if defined(POSIX)
setlocale(LC_ALL, "");
#endif
#if defined(BSD)
setlinebuf(stderr);
#endif
parse_args(argc, argv); /* sets many globals, opens a file */
set_cron_cwd();
if (!allowed(User)) {
fprintf(stderr,
"You (%s) are not allowed to use this program (%s)\n",
User, ProgramName);
fprintf(stderr, "See crontab(1) for more information\n");
log_it(RealUser, Pid, "AUTH", "crontab command not allowed");
exit(ERROR_EXIT);
}
exitstatus = OK_EXIT;
switch (Option) {
case opt_list: list_cmd();
break;
case opt_delete: delete_cmd();
break;
case opt_edit: edit_cmd();
break;
case opt_replace: if (replace_cmd() < 0)
exitstatus = ERROR_EXIT;
break;
/* The following was added to shut
-Wall up, but it will never be hit,
because the option parser will catch
it */
case opt_unknown: usage("unknown option specified");
break;
}
exit(exitstatus);
/*NOTREACHED*/
}
#if DEBUGGING
char *getoptarg = "u:lerix:";
#else
char *getoptarg = "u:leri";
#endif
static void
parse_args(argc, argv)
int argc;
char *argv[];
{
int argch;
struct stat statbuf;
if (!(pw = getpwuid(getuid()))) {
fprintf(stderr, "%s: your UID isn't in the passwd file.\n",
ProgramName);
fprintf(stderr, "bailing out.\n");
exit(ERROR_EXIT);
}
if (((User=strdup(pw->pw_name)) == NULL) ||
((RealUser=strdup(pw->pw_name)) == NULL)) {
fprintf(stderr, "Memory allocation error\n");
exit(ERROR_EXIT);
}
Filename[0] = '\0';
Option = opt_unknown;
PromptOnDelete = 0;
while (EOF != (argch = getopt(argc, argv, getoptarg))) {
switch (argch) {
#if DEBUGGING
case 'x':
if (!set_debug_flags(optarg))
usage("bad debug option");
usage("unrecognized option");
break;
#endif
case 'u':
if (!(pw = getpwnam(optarg)))
{
fprintf(stderr, "%s: user `%s' unknown\n",
ProgramName, optarg);
exit(ERROR_EXIT);
}
if ((getuid() != ROOT_UID) &&
(getuid() != pw->pw_uid))
{
fprintf(stderr,
"must be privileged to use -u\n");
exit(ERROR_EXIT);
}
free(User);
if ((User=strdup(pw->pw_name)) == NULL) {
fprintf(stderr, "Memory allocation error\n");
exit(ERROR_EXIT);
}
break;
case 'l':
if (Option != opt_unknown)
usage("only one operation permitted");
Option = opt_list;
break;
case 'r':
if (Option != opt_unknown)
usage("only one operation permitted");
Option = opt_delete;
break;
case 'e':
if (Option != opt_unknown)
usage("only one operation permitted");
Option = opt_edit;
break;
case 'i':
PromptOnDelete = 1;
break;
default:
usage("unrecognized option");
}
}
endpwent();
if (Option != opt_unknown) {
if (argv[optind] != NULL) {
usage("no arguments permitted after this option");
}
} else {
if (argv[optind] != NULL) {
Option = opt_replace;
(void) strncpy (Filename, argv[optind], (sizeof Filename)-1);
Filename[(sizeof Filename)-1] = '\0';
} else {
usage("file name must be specified for replace");
}
}
if (Option == opt_replace) {
/* we have to open the file here because we're going to
* chdir(2) into /var/cron before we get around to
* reading the file.
*/
if (!strcmp(Filename, "-")) {
NewCrontab = stdin;
} else {
/* relinquish the setuid status of the binary during
* the open, lest nonroot users read files they should
* not be able to read. we can't use access() here
* since there's a race condition. thanks go out to
* Arnt Gulbrandsen <agulbra@pvv.unit.no> for spotting
* the race.
*/
if (swap_uids() < OK) {
perror("swapping uids");
exit(ERROR_EXIT);
}
if (!(NewCrontab = fopen(Filename, "r"))) {
perror(Filename);
exit(ERROR_EXIT);
}
/* Make sure we opened a normal file. */
if (fstat(fileno(NewCrontab), &statbuf) < 0) {
perror("fstat");
exit(ERROR_EXIT);
}
if (!S_ISREG(statbuf.st_mode)) {
fprintf(stderr, "%s: Not a regular file.\n", Filename);
exit(ERROR_EXIT);
}
if (swap_uids_back() < OK) {
perror("swapping uids back");
exit(ERROR_EXIT);
}
}
}
Debug(DMISC, ("user=%s, file=%s, option=%s\n",
User, Filename, Options[(int)Option]))
}
static void
list_cmd() {
char n[MAX_FNAME];
FILE *f;
int ch;
#ifdef DEBIAN
int x;
char *ctnh;
#endif
log_it(RealUser, Pid, "LIST", User);
(void) snprintf(n, MAX_FNAME, CRON_TAB(User));
if (!(f = fopen(n, "r"))) {
if (errno == ENOENT)
fprintf(stderr, "no crontab for %s\n", User);
else {
fprintf(stderr, "%s/", CRONDIR);
perror(n);
}
exit(ERROR_EXIT);
}
/* file is open. copy to stdout, close.
*/
Set_LineNum(1)
#ifdef DEBIAN
/* DEBIAN: Don't list header lines unless CRONTAB_NOHEADER is
'N'. */
/* ignore the top few comments since we probably put them there.
*/
if (!(ctnh = getenv("CRONTAB_NOHEADER")) ||
toupper(*ctnh) != 'N')
{
for (x = 0; x < NHEADER_LINES; x++) {
ch = get_char(f);
if (EOF == ch)
break;
if ('#' != ch) {
putchar(ch);
break;
}
while (EOF != (ch = get_char(f)))
if (ch == '\n')
break;
if (EOF == ch)
break;
}
}
#endif
while (EOF != (ch = get_char(f)))
putchar(ch);
fclose(f);
}
static void
delete_cmd() {
char n[MAX_FNAME];
char q[MAX_TEMPSTR];
int ans;
if( PromptOnDelete == 1 )
{
printf("crontab: really delete %s's crontab? ", User);
fflush(stdout);
ans = 0;
q[0] = '\0';
while ( ans == 0 ) {
(void) fgets(q, sizeof q, stdin);
switch (islower(q[0]) ? q[0] : tolower(q[0])) {
case 'y':
case 'n':
ans = 1;
break;
default:
fprintf(stderr, "Please enter Y or N: ");
}
}
if ( (q[0] == 'N') || (q[0] == 'n') )
exit(OK_EXIT);
}
log_it(RealUser, Pid, "DELETE", User);
(void) snprintf(n, MAX_FNAME, CRON_TAB(User));
if (unlink(n)) {
if (errno == ENOENT)
fprintf(stderr, "no crontab for %s\n", User);
else {
fprintf(stderr, "%s/", CRONDIR);
perror(n);
}
exit(ERROR_EXIT);
}
poke_daemon();
}
static void
check_error(msg)
char *msg;
{
CheckErrorCount++;
fprintf(stderr, "\"%s\":%d: %s\n", Filename, LineNumber-1, msg);
}
/* The next several function implement 'crontab -e' */
/* Returns -1 on error, or fd to tempfile. */
static int
create_tmp_crontab()
{
const char *template = "/crontab.XXXXXX";
int nfd;
char *tmp;
/* Create the temp directory. Note that since crontab is
setuid(root), TMPDIR only work for root. */
if ((tmp=getenv("TMPDIR")) && strlen(tmp) < MAX_FNAME) {
strcpy(Directory, tmp);
} else {
strcpy(Directory,"/tmp");
}
if (strlen(Directory) + strlen(template) < MAX_FNAME) {
strcat(Directory, template);
} else {
fprintf(stderr, "TMPDIR value is to long -- exiting\n");
Directory[0] = '\0';
return -1;
}
if (!mkdtemp(Directory)) {
perror(Directory);
Directory[0] = '\0';
return -1;
}
/* Now create the actual temporary crontab file */
if (snprintf(Filename, MAX_FNAME, "%s/crontab", Directory)
>= MAX_FNAME) {
fprintf(stderr, "Temporary filename too long - aborting\n");
Filename[0] = '\0';
return -1;
}
if ((nfd=open(Filename, O_CREAT|O_EXCL|O_WRONLY, 0600)) == -1) {
perror(Filename);
Filename[0] = '\0';
return -1;
}
return nfd;
}
/* Re-open the new (temporary) crontab, and check to make sure that
no-one is playing games. Return 0 on success, -1 on error. (Why not
just fopen() and stat()? Because there's no guarantee that you
fopen()ed the file you stat()ed.) */
static int
open_tmp_crontab(fsbuf)
struct stat *fsbuf;
{
int t;
struct stat statbuf;
if ((t=open(Filename, O_RDONLY)) < 0) {
perror("Can't open tempfile after edit");
return -1;
}
if (fstat(t, &statbuf) < 0) {
perror("fstat");
return -1;
}
if (statbuf.st_uid != getuid()) {
fprintf(stderr, "Temporary crontab no longer owned by you.\n");
return -1;;
}
if (!S_ISREG(statbuf.st_mode)) {
fprintf(stderr, "The temporary crontab must remain a regular file");
return -1;
}
if (statbuf.st_mtime == fsbuf->st_mtime) {
return 1; /* No change to file */
}
NewCrontab = fdopen(t, "r");
if (!NewCrontab) {
perror("fdopen(): after edit");
return -1;
}
return 0;
}
/* We can't just delete Filename, because the editor might have
created other temporary files in there. If there's an error, we
just bail, and let the user/admin deal with it.*/
static void
cleanup_tmp_crontab(void)
{
DIR *dp;
struct dirent *ep;
char fname[MAX_FNAME];
if (Directory[0] == '\0') {
return;
}
/* Delete contents */
dp = opendir (Directory);
if (dp == NULL) {
perror(Directory);
return;
}
while ((ep = readdir (dp))) {
if (!strcmp(ep->d_name, ".") ||
!strcmp(ep->d_name, "..")) {
continue;
}
if (snprintf(fname, MAX_FNAME, "%s/%s",
Directory, ep->d_name) >= MAX_FNAME) {
fprintf(stderr, "filename too long to delete: %s/%s",
Directory, ep->d_name);
return;
}
if (unlink(fname)) {
perror(ep->d_name);
return;
}
}
(void) closedir (dp);
if (rmdir(Directory)) {
perror(Directory);
return;
}
return;
}
static void
edit_cmd() {
char n[MAX_FNAME], q[MAX_TEMPSTR], *editor;
FILE *f;
int ch, t, x;
struct stat fsbuf;
WAIT_T waiter;
PID_T pid, xpid;
mode_t um;
int add_help_text = 0;
log_it(RealUser, Pid, "BEGIN EDIT", User);
(void) snprintf(n, MAX_FNAME, CRON_TAB(User));
if (!(f = fopen(n, "r"))) {
if (errno != ENOENT) {
fprintf(stderr, "%s/", CRONDIR);
perror(n);
exit(ERROR_EXIT);
}
fprintf(stderr, "no crontab for %s - using an empty one\n",
User);
if (!(f = fopen("/dev/null", "r"))) {
perror("/dev/null");
exit(ERROR_EXIT);
}
add_help_text = 1;
}
um = umask(077);
if ((t=create_tmp_crontab()) < 0) {
fprintf(stderr, "Creation of temporary crontab file failed - aborting\n");
(void) umask(um);
goto fatal;
}
(void) umask(um);
if (!(NewCrontab = fdopen(t, "w"))) {
perror("fdopen");
goto fatal;
}
Set_LineNum(1)
if (add_help_text) {
fprintf(NewCrontab, "# m h dom mon dow command\n" );
}
/* ignore the top few comments since we probably put them there.
*/
for (x = 0; x < NHEADER_LINES; x++) {
ch = get_char(f);
if (EOF == ch)
break;
if ('#' != ch) {
putc(ch, NewCrontab);
break;
}
while (EOF != (ch = get_char(f)))
if (ch == '\n')
break;
if (EOF == ch)
break;
}
/* copy the rest of the crontab (if any) to the temp file.
*/
if (EOF != ch)
while (EOF != (ch = get_char(f)))
putc(ch, NewCrontab);
fclose(f);
if (ferror(NewCrontab)) {
fprintf(stderr, "%s: error while writing new crontab to %s\n",
ProgramName, Filename);
}
if (fstat(t, &fsbuf) < 0) {
perror("unable to stat temp file");
goto fatal;
}
/* Okay, edit the file */
if ((!((editor = getenv("VISUAL")) && strlen(editor)))
&& (!((editor = getenv("EDITOR")) && strlen(editor)))
) {
editor = EDITOR;
}
if (fclose(NewCrontab) != 0) {
perror(Filename);
goto fatal;
}
again: /* Loop point for retrying edit after error */
/* Turn off signals. */
(void)signal(SIGHUP, SIG_IGN);
(void)signal(SIGINT, SIG_IGN);
(void)signal(SIGQUIT, SIG_IGN);
/* Give up privileges while editing */
swap_uids();
switch (pid = fork()) {
case -1:
perror("fork");
goto fatal;
case 0:
/* child */
if (setgid(getgid()) < 0) {
perror("setgid(getgid())");
exit(ERROR_EXIT);
}
if (setuid(getuid()) < 0) {
perror("setuid(getuid())");
exit(ERROR_EXIT);
}
if (chdir("/tmp") < 0) {
perror("chdir(/tmp)");
exit(ERROR_EXIT);
}
if (strlen(editor) + strlen(Filename) + 2 >= MAX_TEMPSTR) {
fprintf(stderr, "%s: editor or filename too long\n",
ProgramName);
exit(ERROR_EXIT);
}
snprintf(q, MAX_TEMPSTR, "%s %s", editor, Filename);
execlp(_PATH_BSHELL, _PATH_BSHELL, "-c", q, NULL);
perror(editor);
exit(ERROR_EXIT);
/*NOTREACHED*/
default:
/* parent */
break;
}
/* parent */
while (1) {
xpid = waitpid(pid, &waiter, WUNTRACED);
if (xpid == -1) {
fprintf(stderr, "%s: waitpid() failed waiting for PID %d from \"%s\": %s\n",
ProgramName, pid, editor, strerror(errno));
} else if (xpid != pid) {
fprintf(stderr, "%s: wrong PID (%d != %d) from \"%s\"\n",
ProgramName, xpid, pid, editor);
goto fatal;
} else if (WIFSTOPPED(waiter)) {
/* raise(WSTOPSIG(waiter)); Not needed and breaks in job control shell*/
} else if (WIFEXITED(waiter) && WEXITSTATUS(waiter)) {
fprintf(stderr, "%s: \"%s\" exited with status %d\n",
ProgramName, editor, WEXITSTATUS(waiter));
goto fatal;
} else if (WIFSIGNALED(waiter)) {
fprintf(stderr,
"%s: \"%s\" killed; signal %d (%score dumped)\n",
ProgramName, editor, WTERMSIG(waiter),
WCOREDUMP(waiter) ?"" :"no ");
goto fatal;
} else
break;
}
(void)signal(SIGHUP, SIG_DFL);
(void)signal(SIGINT, SIG_DFL);
(void)signal(SIGQUIT, SIG_DFL);
(void)signal(SIGTSTP, SIG_DFL);
/* Need privs again */
swap_uids_back();
switch (open_tmp_crontab(&fsbuf)) {
case -1:
fprintf(stderr, "Error while editing crontab\n");
goto fatal;
case 1:
fprintf(stderr, "No modification made\n");
goto remove;
case 0:
break;
default:
fprintf(stderr,
"cron@packages.debian.org fscked up. Send him a nasty note\n");
break;
}
fprintf(stderr, "%s: installing new crontab\n", ProgramName);
switch (replace_cmd()) {
case 0:
break;
case -1:
for (;;) {
printf("Do you want to retry the same edit? ");
fflush(stdout);
q[0] = '\0';
(void) fgets(q, sizeof q, stdin);
switch (islower(q[0]) ? q[0] : tolower(q[0])) {
case 'y':
goto again;
case 'n':
goto abandon;
default:
fprintf(stderr, "Enter Y or N\n");
}
}
/*NOTREACHED*/
case -2:
abandon:
fprintf(stderr, "%s: edits left in %s\n",
ProgramName, Filename);
goto done;
default:
fprintf(stderr, "%s: panic: bad switch() in replace_cmd()\n",
ProgramName);
goto fatal;
}
remove:
cleanup_tmp_crontab();
done:
log_it(RealUser, Pid, "END EDIT", User);
return;
fatal:
cleanup_tmp_crontab();
unlink(Filename);
exit(ERROR_EXIT);
}
static char tn[MAX_FNAME];
static void sig_handler(int x)
{
unlink(tn);
exit(1);
}
/* returns 0 on success
* -1 on syntax error
* -2 on install error
*/
static int
replace_cmd() {
char n[MAX_FNAME], envstr[MAX_ENVSTR];
FILE *tmp;
int ch, eof, fd;
entry *e;
time_t now = time(NULL);
char **envp = env_init();
mode_t um;
if (envp == NULL) {
fprintf(stderr, "%s: Cannot allocate memory.\n", ProgramName);
return (-2);
}
/* Assumes Linux-style signal handlers (takes int, returns void) */
/* Signal handlers, to ensure we do not leave temp files in the
spool dir. We don't remove these on exiting this function;
but that's OK, we exit immediately afterwards anyway. */
signal(SIGHUP, sig_handler);
signal(SIGINT, sig_handler);
signal(SIGQUIT, sig_handler);
signal(SIGTSTP, SIG_IGN);
(void) snprintf(tn, MAX_FNAME, CRON_TAB("tmp.XXXXXX"));
um = umask(077);
fd = mkstemp(tn);
if (fd < 0) {
fprintf(stderr, "%s/", CRONDIR);
perror(tn);
return(-2);
}
tmp = fdopen(fd, "w+");
if (!tmp) {
fprintf(stderr, "%s/", CRONDIR);
perror(tn);
return (-2);
}
(void) umask(um);
/* write a signature at the top of the file.
*
* VERY IMPORTANT: make sure NHEADER_LINES agrees with this code.
*/
fprintf(tmp, "# DO NOT EDIT THIS FILE - edit the master and reinstall.\n");
fprintf(tmp, "# (%s installed on %-24.24s)\n", Filename, ctime(&now));
fprintf(tmp, "# (Cron version -- %s)\n", rcsid);
/* copy the crontab to the tmp
*/
rewind(NewCrontab);
Set_LineNum(1)
while (EOF != (ch = get_char(NewCrontab)))
putc(ch, tmp);
if (ferror(tmp) || fflush(tmp) || fsync(fd)) {
fprintf(stderr, "%s: error while writing new crontab to %s\n",
ProgramName, tn);
perror("Error");
fclose(tmp); unlink(tn);
return (-2);
}
/* check the syntax of the file being installed.
*/
rewind(tmp);
/* BUG: was reporting errors after the EOF if there were any errors
* in the file proper -- kludged it by stopping after first error.
* vix 31mar87
*/
Set_LineNum(1 - NHEADER_LINES)
CheckErrorCount = 0; eof = FALSE;
while (!CheckErrorCount && !eof) {
switch (load_env(envstr, tmp)) {
case ERR:
eof = TRUE;
break;
case FALSE:
e = load_entry(tmp, check_error, pw, envp);
if (e)
free(e);
break;
case TRUE:
break;
}
}
if (CheckErrorCount != 0) {
fprintf(stderr, "errors in crontab file, can't install.\n");
fclose(tmp); unlink(tn);
return (-1);
}
#ifdef HAS_FCHMOD
if (fchmod(fileno(tmp), 0600) < OK)
#else
if (chmod(tn, 0600) < OK)
#endif
{
perror("chmod");
fclose(tmp); unlink(tn);
return (-2);
}
if (fclose(tmp) == EOF) {
perror("fclose");
unlink(tn);
return (-2);
}
/* Root on behalf of another user must set file owner to that user */
if (getuid() == ROOT_UID && strcmp(User, RealUser) != 0) {
if (chown(tn, pw->pw_uid, -1) != 0) {
perror("chown");
unlink(tn);
return -2;
}
}
(void) snprintf(n, sizeof(n), CRON_TAB(User));
if (rename(tn, n)) {
fprintf(stderr, "%s: error renaming %s to %s\n",
ProgramName, tn, n);
perror("rename");
unlink(tn);
return (-2);
}
log_it(RealUser, Pid, "REPLACE", User);
poke_daemon();
return (0);
}
static void
poke_daemon() {
#ifdef USE_UTIMES
struct timeval tvs[2];
struct timezone tz;
(void) gettimeofday(&tvs[0], &tz);
tvs[1] = tvs[0];
if (utimes(SPOOL_DIR, tvs) < OK) {
fprintf(stderr, "crontab: can't update mtime on spooldir\n");
fprintf(stderr, "%s/", CRONDIR);
perror(SPOOL_DIR);
return;
}
#else
if (utime(SPOOL_DIR, NULL) < OK) {
fprintf(stderr, "crontab: can't update mtime on spooldir\n");
fprintf(stderr, "%s/", CRONDIR);
perror(SPOOL_DIR);
return;
}
#endif /*USE_UTIMES*/
}
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