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Report login attempts to syslog. Due to the statically-linked nature of

Browse Source 
nologin(8), this causes a considerable (100K) increase in the binary size,
so I've added a NO_LOGIN_LOG option which disables this.

While I'm here, s/sizeof(MESSAGE)/sizeof(MESSAGE) - 1/, in order to
avoid writing the string-terminating zero byte.

No complaints from: -current
Approved by:	rwatson (mentor)
This commit is contained in:
Colin Percival 2004-02-22 10:03:24 +00:00
parent 9a6caa1afc
commit 47c524ddd4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=126117
4 changed files with 42 additions and 2 deletions
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7
sbin/nologin/Makefile
View File

@ -11,4 +11,11 @@ MAN= nologin.5 nologin.8
# rendering a dynamic nologin binary virtually useless.
NOSHARED= YES
# Logging to syslog increases the size of the statically linked
# binary by over 100K. Provide an option for disabling this on
# systems where conserving space on the root device is critical.
.ifdef NO_NOLOGIN_LOG
CFLAGS+= -DNO_NOLOGIN_LOG
.endif
.include <bsd.prog.mk>

15
sbin/nologin/nologin.c
View File

@ -8,6 +8,7 @@ __FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/uio.h>
#include <syslog.h>
#include <unistd.h>
#define MESSAGE "This account is currently not available.\n"
@ -15,7 +16,19 @@ __FBSDID("$FreeBSD$");
int
main(int argc, char *argv[])
{
#ifndef NO_NOLOGIN_LOG
char *user, *tt;
write(STDOUT_FILENO, MESSAGE, sizeof(MESSAGE));
if ((tt = ttyname(0)) == NULL)
tt = "UNKNOWN";
if ((user = getlogin()) == NULL)
user = "UNKNOWN";
openlog("nologin", LOG_CONS, LOG_AUTH);
syslog(LOG_CRIT, "Attempted login by %s on %s", user, tt);
closelog();
#endif /* NO_NOLOGIN_LOG */
write(STDOUT_FILENO, MESSAGE, sizeof(MESSAGE) - 1);
_exit(1);
}

7
usr.sbin/nologin/Makefile
View File

@ -11,4 +11,11 @@ MAN= nologin.5 nologin.8
# rendering a dynamic nologin binary virtually useless.
NOSHARED= YES
# Logging to syslog increases the size of the statically linked
# binary by over 100K. Provide an option for disabling this on
# systems where conserving space on the root device is critical.
.ifdef NO_NOLOGIN_LOG
CFLAGS+= -DNO_NOLOGIN_LOG
.endif
.include <bsd.prog.mk>

15
usr.sbin/nologin/nologin.c
View File

@ -8,6 +8,7 @@ __FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/uio.h>
#include <syslog.h>
#include <unistd.h>
#define MESSAGE "This account is currently not available.\n"
@ -15,7 +16,19 @@ __FBSDID("$FreeBSD$");
int
main(int argc, char *argv[])
{
#ifndef NO_NOLOGIN_LOG
char *user, *tt;
write(STDOUT_FILENO, MESSAGE, sizeof(MESSAGE));
if ((tt = ttyname(0)) == NULL)
tt = "UNKNOWN";
if ((user = getlogin()) == NULL)
user = "UNKNOWN";
openlog("nologin", LOG_CONS, LOG_AUTH);
syslog(LOG_CRIT, "Attempted login by %s on %s", user, tt);
closelog();
#endif /* NO_NOLOGIN_LOG */
write(STDOUT_FILENO, MESSAGE, sizeof(MESSAGE) - 1);
_exit(1);
}