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When incorrect passwords are entered, behave similarly to login(1) and backoff
for a bit. Based on a diff from martynas@.
This commit is contained in:
parent
61b7dc522d
commit
c5ac2579ba
41
server-fn.c
41
server-fn.c
@ -18,6 +18,8 @@
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#include <sys/types.h>
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#include <login_cap.h>
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#include <pwd.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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@ -159,12 +161,20 @@ server_status_window(struct window *w)
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void
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server_lock(void)
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{
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struct client *c;
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u_int i;
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struct client *c;
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static struct passwd *pw, pwstore;
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static char pwbuf[_PW_BUF_LEN];
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u_int i;
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if (server_locked)
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return;
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if (getpwuid_r(getuid(), &pwstore, pwbuf, sizeof pwbuf, &pw) != 0) {
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server_locked_pw = NULL;
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return;
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}
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server_locked_pw = pw;
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for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
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c = ARRAY_ITEM(&clients, i);
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if (c == NULL || c->session == NULL)
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@ -175,6 +185,7 @@ server_lock(void)
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"Password:", server_lock_callback, NULL, c, PROMPT_HIDDEN);
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server_redraw_client(c);
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}
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server_locked = 1;
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}
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@ -188,12 +199,16 @@ int
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server_unlock(const char *s)
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{
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struct client *c;
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login_cap_t *lc;
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u_int i;
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char *out;
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u_int failures, tries, backoff;
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if (!server_locked)
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if (!server_locked || server_locked_pw == NULL)
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return (0);
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server_activity = time(NULL);
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if (server_activity < password_backoff)
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return (-2);
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if (server_password != NULL) {
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if (s == NULL)
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@ -214,10 +229,13 @@ server_unlock(const char *s)
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server_locked = 0;
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password_failures = 0;
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password_backoff = 0;
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return (0);
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wrong:
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password_backoff = server_activity;
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password_failures++;
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for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
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c = ARRAY_ITEM(&clients, i);
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if (c == NULL || c->prompt_buffer == NULL)
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@ -228,6 +246,23 @@ wrong:
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server_redraw_client(c);
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}
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/*
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* Start slowing down after "login-backoff" attempts and reset every
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* "login-tries" attempts.
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*/
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lc = login_getclass(server_locked_pw->pw_class);
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if (lc != NULL) {
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tries = login_getcapnum(lc, (char *) "login-tries", 10, 10);
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backoff = login_getcapnum(lc, (char *) "login-backoff", 3, 3);
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} else {
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tries = 10;
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backoff = 3;
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}
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failures = password_failures % tries;
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if (failures > backoff) {
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password_backoff += ((failures - backoff) * tries / 2);
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return (-2);
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}
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return (-1);
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}
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@ -99,8 +99,15 @@ server_msg_dispatch(struct client *c)
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memcpy(&unlockdata, imsg.data, sizeof unlockdata);
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unlockdata.pass[(sizeof unlockdata.pass) - 1] = '\0';
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if (server_unlock(unlockdata.pass) != 0)
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switch (server_unlock(unlockdata.pass)) {
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case -1:
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server_write_error(c, "bad password");
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break;
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case -2:
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server_write_error(c,
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"too many bad passwords, sleeping");
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break;
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}
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memset(&unlockdata, 0, sizeof unlockdata);
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server_write_client(c, MSG_EXIT, NULL, 0);
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break;
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5
tmux.1
5
tmux.1
@ -1209,6 +1209,11 @@ seconds of inactivity.
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The default is off (set to 0).
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This has no effect as a session option; it must be set as a global option using
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.Fl g .
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When passwords are entered incorrectly,
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.Nm
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follows the behaviour of
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.Xr login 1
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and ignores further password attempts for an increasing timeout.
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.It Ic message-attr Ar attributes
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Set status line message attributes, where
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.Ar attributes
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2
tmux.c
2
tmux.c
@ -47,7 +47,9 @@ struct options global_w_options; /* window options */
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struct environ global_environ;
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int server_locked;
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struct passwd *server_locked_pw;
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u_int password_failures;
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time_t password_backoff;
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char *server_password;
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time_t server_activity;
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2
tmux.h
2
tmux.h
@ -1108,7 +1108,9 @@ extern struct options global_w_options;
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extern struct environ global_environ;
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extern char *cfg_file;
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extern int server_locked;
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extern struct passwd *server_locked_pw;
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extern u_int password_failures;
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extern time_t password_backoff;
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extern char *server_password;
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extern time_t server_activity;
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extern int debug_level;
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