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authorGravatar Denys Vlasenko <vda.linux@googlemail.com>2021-03-19 00:27:44 +0100
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2021-03-19 00:27:44 +0100
commit2a2ca935309bfacbc7f87de752f869a89748052c (patch)
tree6e77e3b09e400c959636cfffd3ae16d4fca031a2
parentfe78d70ec6c48f88126f6deffe04d4707a65c9ac (diff)
downloadbusybox-2a2ca935309bfacbc7f87de752f869a89748052c.tar.gz
busybox-2a2ca935309bfacbc7f87de752f869a89748052c.tar.bz2
login: implement LOGIN_TIMEOUT
function old new delta packed_usage 33559 33598 +39 login_main 953 986 +33 .rodata 103161 103175 +14 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 3/0 up/down: 86/0) Total: 86 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--loginutils/login.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/loginutils/login.c b/loginutils/login.c
index 21c32fc25..66ac7cf4c 100644
--- a/loginutils/login.c
+++ b/loginutils/login.c
@@ -60,6 +60,11 @@
//usage: "\n -f Don't authenticate (user already authenticated)"
//usage: "\n -h HOST Host user came from (for network logins)"
//usage: "\n -p Preserve environment"
+//usage: "\n"
+//usage: "\n$LOGIN_TIMEOUT Seconds (default 60, 0 - disable)"
+//usage: IF_LOGIN_SCRIPTS(
+//usage: "\n$LOGIN_PRE_SUID_SCRIPT Execute before user ID change"
+//usage: )
#include "libbb.h"
#include "common_bufsiz.h"
@@ -130,7 +135,6 @@ static const struct pam_conv conv = {
#endif
enum {
- TIMEOUT = 60,
EMPTY_USERNAME_COUNT = 10,
/* Some users found 32 chars limit to be too low: */
USERNAME_SIZE = 64,
@@ -139,6 +143,7 @@ enum {
struct globals {
struct termios tty_attrs;
+ int timeout;
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define INIT_G() do { setup_common_bufsiz(); } while (0)
@@ -302,7 +307,7 @@ static void alarm_handler(int sig UNUSED_PARAM)
* when you are back at shell prompt, echo will be still off.
*/
tcsetattr_stdin_TCSANOW(&G.tty_attrs);
- printf("\r\nLogin timed out after %u seconds\r\n", TIMEOUT);
+ printf("\r\nLogin timed out after %u seconds\r\n", G.timeout);
fflush_all();
/* unix API is brain damaged regarding O_NONBLOCK,
* we should undo it, or else we can affect other processes */
@@ -345,6 +350,8 @@ int login_main(int argc UNUSED_PARAM, char **argv)
INIT_G();
+ G.timeout = xatoi_positive(getenv("LOGIN_TIMEOUT") ? : "60");
+
/* More of suid paranoia if called by non-root: */
/* Clear dangerous stuff, set PATH */
run_by_root = !sanitize_env_if_suid();
@@ -376,7 +383,7 @@ int login_main(int argc UNUSED_PARAM, char **argv)
/* We install timeout handler only _after_ we saved G.tty_attrs */
signal(SIGALRM, alarm_handler);
- alarm(TIMEOUT);
+ alarm(G.timeout);
/* Find out and memorize our tty name */
full_tty = xmalloc_ttyname(STDIN_FILENO);