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login: implement LOGIN_TIMEOUT

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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>
This commit is contained in:
Denys Vlasenko 2021-03-19 00:27:44 +01:00
parent fe78d70ec6
commit 2a2ca93530
1 changed files with 10 additions and 3 deletions
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13
loginutils/login.c
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@ -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);