mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-16 10:20:30 +00:00
526b145c23
for any reason other than ENOENT (think resource limits). Close allow and deny files before allowed() returns to stop the user's EDITOR being able to read them. Obtained from: OpenBSD (partially)
663 lines
13 KiB
C
663 lines
13 KiB
C
/* 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 const char rcsid[] =
|
|
"$FreeBSD$";
|
|
#endif
|
|
|
|
/* vix 26jan87 [RCS has the rest of the log]
|
|
* vix 30dec86 [written]
|
|
*/
|
|
|
|
|
|
#include "cron.h"
|
|
#if SYS_TIME_H
|
|
# include <sys/time.h>
|
|
#else
|
|
# include <time.h>
|
|
#endif
|
|
#include <sys/file.h>
|
|
#include <sys/stat.h>
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <fcntl.h>
|
|
#if defined(SYSLOG)
|
|
# include <syslog.h>
|
|
#endif
|
|
|
|
|
|
#if defined(LOG_DAEMON) && !defined(LOG_CRON)
|
|
#define LOG_CRON LOG_DAEMON
|
|
#endif
|
|
|
|
|
|
static int LogFD = ERR;
|
|
|
|
|
|
int
|
|
strcmp_until(left, right, until)
|
|
char *left;
|
|
char *right;
|
|
int until;
|
|
{
|
|
register int diff;
|
|
|
|
while (*left && *left != until && *left == *right) {
|
|
left++;
|
|
right++;
|
|
}
|
|
|
|
if ((*left=='\0' || *left == until) &&
|
|
(*right=='\0' || *right == until)) {
|
|
diff = 0;
|
|
} else {
|
|
diff = *left - *right;
|
|
}
|
|
|
|
return diff;
|
|
}
|
|
|
|
|
|
/* strdtb(s) - delete trailing blanks in string 's' and return new length
|
|
*/
|
|
int
|
|
strdtb(s)
|
|
char *s;
|
|
{
|
|
char *x = s;
|
|
|
|
/* scan forward to the null
|
|
*/
|
|
while (*x)
|
|
x++;
|
|
|
|
/* scan backward to either the first character before the string,
|
|
* or the last non-blank in the string, whichever comes first.
|
|
*/
|
|
do {x--;}
|
|
while (x >= s && isspace(*x));
|
|
|
|
/* one character beyond where we stopped above is where the null
|
|
* goes.
|
|
*/
|
|
*++x = '\0';
|
|
|
|
/* the difference between the position of the null character and
|
|
* the position of the first character of the string is the length.
|
|
*/
|
|
return x - s;
|
|
}
|
|
|
|
|
|
int
|
|
set_debug_flags(flags)
|
|
char *flags;
|
|
{
|
|
/* debug flags are of the form flag[,flag ...]
|
|
*
|
|
* if an error occurs, print a message to stdout and return FALSE.
|
|
* otherwise return TRUE after setting ERROR_FLAGS.
|
|
*/
|
|
|
|
#if !DEBUGGING
|
|
|
|
printf("this program was compiled without debugging enabled\n");
|
|
return FALSE;
|
|
|
|
#else /* DEBUGGING */
|
|
|
|
char *pc = flags;
|
|
|
|
DebugFlags = 0;
|
|
|
|
while (*pc) {
|
|
char **test;
|
|
int mask;
|
|
|
|
/* try to find debug flag name in our list.
|
|
*/
|
|
for ( test = DebugFlagNames, mask = 1;
|
|
*test && strcmp_until(*test, pc, ',');
|
|
test++, mask <<= 1
|
|
)
|
|
;
|
|
|
|
if (!*test) {
|
|
fprintf(stderr,
|
|
"unrecognized debug flag <%s> <%s>\n",
|
|
flags, pc);
|
|
return FALSE;
|
|
}
|
|
|
|
DebugFlags |= mask;
|
|
|
|
/* skip to the next flag
|
|
*/
|
|
while (*pc && *pc != ',')
|
|
pc++;
|
|
if (*pc == ',')
|
|
pc++;
|
|
}
|
|
|
|
if (DebugFlags) {
|
|
int flag;
|
|
|
|
fprintf(stderr, "debug flags enabled:");
|
|
|
|
for (flag = 0; DebugFlagNames[flag]; flag++)
|
|
if (DebugFlags & (1 << flag))
|
|
fprintf(stderr, " %s", DebugFlagNames[flag]);
|
|
fprintf(stderr, "\n");
|
|
}
|
|
|
|
return TRUE;
|
|
|
|
#endif /* DEBUGGING */
|
|
}
|
|
|
|
|
|
void
|
|
set_cron_uid()
|
|
{
|
|
#if defined(BSD) || defined(POSIX)
|
|
if (seteuid(ROOT_UID) < OK)
|
|
err(ERROR_EXIT, "seteuid");
|
|
#else
|
|
if (setuid(ROOT_UID) < OK)
|
|
err(ERROR_EXIT, "setuid");
|
|
#endif
|
|
}
|
|
|
|
|
|
void
|
|
set_cron_cwd()
|
|
{
|
|
struct stat sb;
|
|
|
|
/* first check for CRONDIR ("/var/cron" or some such)
|
|
*/
|
|
if (stat(CRONDIR, &sb) < OK && errno == ENOENT) {
|
|
warn("%s", CRONDIR);
|
|
if (OK == mkdir(CRONDIR, 0700)) {
|
|
warnx("%s: created", CRONDIR);
|
|
stat(CRONDIR, &sb);
|
|
} else {
|
|
err(ERROR_EXIT, "%s: mkdir", CRONDIR);
|
|
}
|
|
}
|
|
if (!(sb.st_mode & S_IFDIR))
|
|
err(ERROR_EXIT, "'%s' is not a directory, bailing out", CRONDIR);
|
|
if (chdir(CRONDIR) < OK)
|
|
err(ERROR_EXIT, "cannot chdir(%s), bailing out", CRONDIR);
|
|
|
|
/* CRONDIR okay (now==CWD), now look at SPOOL_DIR ("tabs" or some such)
|
|
*/
|
|
if (stat(SPOOL_DIR, &sb) < OK && errno == ENOENT) {
|
|
warn("%s", SPOOL_DIR);
|
|
if (OK == mkdir(SPOOL_DIR, 0700)) {
|
|
warnx("%s: created", SPOOL_DIR);
|
|
stat(SPOOL_DIR, &sb);
|
|
} else {
|
|
err(ERROR_EXIT, "%s: mkdir", SPOOL_DIR);
|
|
}
|
|
}
|
|
if (!(sb.st_mode & S_IFDIR))
|
|
err(ERROR_EXIT, "'%s' is not a directory, bailing out", SPOOL_DIR);
|
|
}
|
|
|
|
|
|
/* acquire_daemonlock() - write our PID into /etc/cron.pid, unless
|
|
* another daemon is already running, which we detect here.
|
|
*
|
|
* note: main() calls us twice; once before forking, once after.
|
|
* we maintain static storage of the file pointer so that we
|
|
* can rewrite our PID into the PIDFILE after the fork.
|
|
*
|
|
* it would be great if fflush() disassociated the file buffer.
|
|
*/
|
|
void
|
|
acquire_daemonlock(closeflag)
|
|
int closeflag;
|
|
{
|
|
static FILE *fp = NULL;
|
|
|
|
if (closeflag && fp) {
|
|
fclose(fp);
|
|
fp = NULL;
|
|
return;
|
|
}
|
|
|
|
if (!fp) {
|
|
char pidfile[MAX_FNAME];
|
|
char buf[MAX_TEMPSTR];
|
|
int fd, otherpid;
|
|
|
|
(void) sprintf(pidfile, PIDFILE, PIDDIR);
|
|
if ((-1 == (fd = open(pidfile, O_RDWR|O_CREAT, 0644)))
|
|
|| (NULL == (fp = fdopen(fd, "r+")))
|
|
) {
|
|
sprintf(buf, "can't open or create %s: %s",
|
|
pidfile, strerror(errno));
|
|
log_it("CRON", getpid(), "DEATH", buf);
|
|
errx(ERROR_EXIT, "%s", buf);
|
|
}
|
|
|
|
if (flock(fd, LOCK_EX|LOCK_NB) < OK) {
|
|
int save_errno = errno;
|
|
|
|
fscanf(fp, "%d", &otherpid);
|
|
sprintf(buf, "can't lock %s, otherpid may be %d: %s",
|
|
pidfile, otherpid, strerror(save_errno));
|
|
log_it("CRON", getpid(), "DEATH", buf);
|
|
errx(ERROR_EXIT, "%s", buf);
|
|
}
|
|
|
|
(void) fcntl(fd, F_SETFD, 1);
|
|
}
|
|
|
|
rewind(fp);
|
|
fprintf(fp, "%d\n", getpid());
|
|
fflush(fp);
|
|
(void) ftruncate(fileno(fp), ftell(fp));
|
|
|
|
/* abandon fd and fp even though the file is open. we need to
|
|
* keep it open and locked, but we don't need the handles elsewhere.
|
|
*/
|
|
}
|
|
|
|
/* get_char(file) : like getc() but increment LineNumber on newlines
|
|
*/
|
|
int
|
|
get_char(file)
|
|
FILE *file;
|
|
{
|
|
int ch;
|
|
|
|
ch = getc(file);
|
|
if (ch == '\n')
|
|
Set_LineNum(LineNumber + 1)
|
|
return ch;
|
|
}
|
|
|
|
|
|
/* unget_char(ch, file) : like ungetc but do LineNumber processing
|
|
*/
|
|
void
|
|
unget_char(ch, file)
|
|
int ch;
|
|
FILE *file;
|
|
{
|
|
ungetc(ch, file);
|
|
if (ch == '\n')
|
|
Set_LineNum(LineNumber - 1)
|
|
}
|
|
|
|
|
|
/* get_string(str, max, file, termstr) : like fgets() but
|
|
* (1) has terminator string which should include \n
|
|
* (2) will always leave room for the null
|
|
* (3) uses get_char() so LineNumber will be accurate
|
|
* (4) returns EOF or terminating character, whichever
|
|
*/
|
|
int
|
|
get_string(string, size, file, terms)
|
|
char *string;
|
|
int size;
|
|
FILE *file;
|
|
char *terms;
|
|
{
|
|
int ch;
|
|
|
|
while (EOF != (ch = get_char(file)) && !strchr(terms, ch)) {
|
|
if (size > 1) {
|
|
*string++ = (char) ch;
|
|
size--;
|
|
}
|
|
}
|
|
|
|
if (size > 0)
|
|
*string = '\0';
|
|
|
|
return ch;
|
|
}
|
|
|
|
|
|
/* skip_comments(file) : read past comment (if any)
|
|
*/
|
|
void
|
|
skip_comments(file)
|
|
FILE *file;
|
|
{
|
|
int ch;
|
|
|
|
while (EOF != (ch = get_char(file))) {
|
|
/* ch is now the first character of a line.
|
|
*/
|
|
|
|
while (ch == ' ' || ch == '\t')
|
|
ch = get_char(file);
|
|
|
|
if (ch == EOF)
|
|
break;
|
|
|
|
/* ch is now the first non-blank character of a line.
|
|
*/
|
|
|
|
if (ch != '\n' && ch != '#')
|
|
break;
|
|
|
|
/* ch must be a newline or comment as first non-blank
|
|
* character on a line.
|
|
*/
|
|
|
|
while (ch != '\n' && ch != EOF)
|
|
ch = get_char(file);
|
|
|
|
/* ch is now the newline of a line which we're going to
|
|
* ignore.
|
|
*/
|
|
}
|
|
if (ch != EOF)
|
|
unget_char(ch, file);
|
|
}
|
|
|
|
|
|
/* int in_file(char *string, FILE *file)
|
|
* return TRUE if one of the lines in file matches string exactly,
|
|
* FALSE otherwise.
|
|
*/
|
|
static int
|
|
in_file(string, file)
|
|
char *string;
|
|
FILE *file;
|
|
{
|
|
char line[MAX_TEMPSTR];
|
|
|
|
rewind(file);
|
|
while (fgets(line, MAX_TEMPSTR, file)) {
|
|
if (line[0] != '\0')
|
|
if (line[strlen(line)-1] == '\n')
|
|
line[strlen(line)-1] = '\0';
|
|
if (0 == strcmp(line, string))
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
/* int allowed(char *username)
|
|
* returns TRUE if (ALLOW_FILE exists and user is listed)
|
|
* or (DENY_FILE exists and user is NOT listed)
|
|
* or (neither file exists but user=="root" so it's okay)
|
|
*/
|
|
int
|
|
allowed(username)
|
|
char *username;
|
|
{
|
|
FILE *allow, *deny;
|
|
int isallowed;
|
|
|
|
isallowed = FALSE;
|
|
|
|
#if defined(ALLOW_FILE) && defined(DENY_FILE)
|
|
if ((allow = fopen(ALLOW_FILE, "r")) == NULL && errno != ENOENT)
|
|
goto out;
|
|
if ((deny = fopen(DENY_FILE, "r")) == NULL && errno != ENOENT)
|
|
goto out;
|
|
Debug(DMISC, ("allow/deny enabled, %d/%d\n", !!allow, !!deny))
|
|
#else
|
|
allow = NULL;
|
|
deny = NULL;
|
|
#endif
|
|
|
|
if (allow)
|
|
isallowed = in_file(username, allow);
|
|
else if (deny)
|
|
isallowed = !in_file(username, deny);
|
|
else {
|
|
#if defined(ALLOW_ONLY_ROOT)
|
|
isallowed = (strcmp(username, ROOT_USER) == 0);
|
|
#else
|
|
isallowed = TRUE;
|
|
#endif
|
|
}
|
|
out: if (allow)
|
|
fclose(allow);
|
|
if (deny)
|
|
fclose(deny);
|
|
return (isallowed);
|
|
}
|
|
|
|
|
|
void
|
|
log_it(username, xpid, event, detail)
|
|
char *username;
|
|
int xpid;
|
|
char *event;
|
|
char *detail;
|
|
{
|
|
PID_T pid = xpid;
|
|
#if defined(LOG_FILE)
|
|
char *msg;
|
|
TIME_T now = time((TIME_T) 0);
|
|
register struct tm *t = localtime(&now);
|
|
#endif /*LOG_FILE*/
|
|
|
|
#if defined(SYSLOG)
|
|
static int syslog_open = 0;
|
|
#endif
|
|
|
|
#if defined(LOG_FILE)
|
|
/* we assume that MAX_TEMPSTR will hold the date, time, &punctuation.
|
|
*/
|
|
msg = malloc(strlen(username)
|
|
+ strlen(event)
|
|
+ strlen(detail)
|
|
+ MAX_TEMPSTR);
|
|
|
|
if (msg == NULL)
|
|
warnx("failed to allocate memory for log message");
|
|
else {
|
|
if (LogFD < OK) {
|
|
LogFD = open(LOG_FILE, O_WRONLY|O_APPEND|O_CREAT, 0600);
|
|
if (LogFD < OK) {
|
|
warn("can't open log file %s", LOG_FILE);
|
|
} else {
|
|
(void) fcntl(LogFD, F_SETFD, 1);
|
|
}
|
|
}
|
|
|
|
/* we have to sprintf() it because fprintf() doesn't always
|
|
* write everything out in one chunk and this has to be
|
|
* atomically appended to the log file.
|
|
*/
|
|
sprintf(msg, "%s (%02d/%02d-%02d:%02d:%02d-%d) %s (%s)\n",
|
|
username,
|
|
t->tm_mon+1, t->tm_mday, t->tm_hour, t->tm_min,
|
|
t->tm_sec, pid, event, detail);
|
|
|
|
/* we have to run strlen() because sprintf() returns (char*)
|
|
* on old BSD.
|
|
*/
|
|
if (LogFD < OK || write(LogFD, msg, strlen(msg)) < OK) {
|
|
if (LogFD >= OK)
|
|
warn("%s", LOG_FILE);
|
|
warnx("can't write to log file");
|
|
write(STDERR, msg, strlen(msg));
|
|
}
|
|
|
|
free(msg);
|
|
}
|
|
#endif /*LOG_FILE*/
|
|
|
|
#if defined(SYSLOG)
|
|
if (!syslog_open) {
|
|
/* we don't use LOG_PID since the pid passed to us by
|
|
* our client may not be our own. therefore we want to
|
|
* print the pid ourselves.
|
|
*/
|
|
# ifdef LOG_DAEMON
|
|
openlog(ProgramName, LOG_PID, LOG_CRON);
|
|
# else
|
|
openlog(ProgramName, LOG_PID);
|
|
# endif
|
|
syslog_open = TRUE; /* assume openlog success */
|
|
}
|
|
|
|
syslog(LOG_INFO, "(%s) %s (%s)\n", username, event, detail);
|
|
|
|
#endif /*SYSLOG*/
|
|
|
|
#if DEBUGGING
|
|
if (DebugFlags) {
|
|
fprintf(stderr, "log_it: (%s %d) %s (%s)\n",
|
|
username, pid, event, detail);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
void
|
|
log_close() {
|
|
if (LogFD != ERR) {
|
|
close(LogFD);
|
|
LogFD = ERR;
|
|
}
|
|
}
|
|
|
|
|
|
/* two warnings:
|
|
* (1) this routine is fairly slow
|
|
* (2) it returns a pointer to static storage
|
|
*/
|
|
char *
|
|
first_word(s, t)
|
|
register char *s; /* string we want the first word of */
|
|
register char *t; /* terminators, implicitly including \0 */
|
|
{
|
|
static char retbuf[2][MAX_TEMPSTR + 1]; /* sure wish C had GC */
|
|
static int retsel = 0;
|
|
register char *rb, *rp;
|
|
|
|
/* select a return buffer */
|
|
retsel = 1-retsel;
|
|
rb = &retbuf[retsel][0];
|
|
rp = rb;
|
|
|
|
/* skip any leading terminators */
|
|
while (*s && (NULL != strchr(t, *s))) {
|
|
s++;
|
|
}
|
|
|
|
/* copy until next terminator or full buffer */
|
|
while (*s && (NULL == strchr(t, *s)) && (rp < &rb[MAX_TEMPSTR])) {
|
|
*rp++ = *s++;
|
|
}
|
|
|
|
/* finish the return-string and return it */
|
|
*rp = '\0';
|
|
return rb;
|
|
}
|
|
|
|
|
|
/* warning:
|
|
* heavily ascii-dependent.
|
|
*/
|
|
void
|
|
mkprint(dst, src, len)
|
|
register char *dst;
|
|
register unsigned char *src;
|
|
register int len;
|
|
{
|
|
while (len-- > 0)
|
|
{
|
|
register unsigned char ch = *src++;
|
|
|
|
if (ch < ' ') { /* control character */
|
|
*dst++ = '^';
|
|
*dst++ = ch + '@';
|
|
} else if (ch < 0177) { /* printable */
|
|
*dst++ = ch;
|
|
} else if (ch == 0177) { /* delete/rubout */
|
|
*dst++ = '^';
|
|
*dst++ = '?';
|
|
} else { /* parity character */
|
|
sprintf(dst, "\\%03o", ch);
|
|
dst += 4;
|
|
}
|
|
}
|
|
*dst = '\0';
|
|
}
|
|
|
|
|
|
/* warning:
|
|
* returns a pointer to malloc'd storage, you must call free yourself.
|
|
*/
|
|
char *
|
|
mkprints(src, len)
|
|
register unsigned char *src;
|
|
register unsigned int len;
|
|
{
|
|
register char *dst = malloc(len*4 + 1);
|
|
|
|
if (dst != NULL)
|
|
mkprint(dst, src, len);
|
|
|
|
return dst;
|
|
}
|
|
|
|
|
|
#ifdef MAIL_DATE
|
|
/* Sat, 27 Feb 93 11:44:51 CST
|
|
* 123456789012345678901234567
|
|
*/
|
|
char *
|
|
arpadate(clock)
|
|
time_t *clock;
|
|
{
|
|
time_t t = clock ?*clock :time(0L);
|
|
struct tm *tm = localtime(&t);
|
|
static char ret[32]; /* zone name might be >3 chars */
|
|
|
|
if (tm->tm_year >= 100)
|
|
tm->tm_year += 1900;
|
|
|
|
(void) snprintf(ret, sizeof(ret), "%s, %2d %s %d %02d:%02d:%02d %s",
|
|
DowNames[tm->tm_wday],
|
|
tm->tm_mday,
|
|
MonthNames[tm->tm_mon],
|
|
tm->tm_year,
|
|
tm->tm_hour,
|
|
tm->tm_min,
|
|
tm->tm_sec,
|
|
TZONE(*tm));
|
|
return ret;
|
|
}
|
|
#endif /*MAIL_DATE*/
|
|
|
|
|
|
#ifdef HAVE_SAVED_UIDS
|
|
static int save_euid;
|
|
int swap_uids() { save_euid = geteuid(); return seteuid(getuid()); }
|
|
int swap_uids_back() { return seteuid(save_euid); }
|
|
#else /*HAVE_SAVED_UIDS*/
|
|
int swap_uids() { return setreuid(geteuid(), getuid()); }
|
|
int swap_uids_back() { return swap_uids(); }
|
|
#endif /*HAVE_SAVED_UIDS*/
|