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--- util-linux-2.13-pre1/login-utils/login.c.ctty3 2005-08-02 18:10:24.000000000 +0200
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+++ util-linux-2.13-pre1/login-utils/login.c 2005-08-15 15:51:35.000000000 +0200
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@@ -285,7 +285,21 @@
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updwtmp(_PATH_BTMP, &ut);
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#endif
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}
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-#endif /* HAVE_SECURITY_PAM_MISC_H */
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+
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+static int childPid = 0;
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+static volatile int got_sig = 0;
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+
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+static void
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+parent_sig_handler(int signal)
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+{
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+ if(childPid)
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+ kill(-childPid, signal);
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+ else
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+ got_sig = 1;
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+ if(signal == SIGTERM)
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+ kill(-childPid, SIGHUP); /* because the shell often ignores SIGTERM */
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+}
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+#endif /* HAVE_SECURITY_PAM_MISC_H */
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int
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main(int argc, char **argv)
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@@ -307,7 +321,7 @@
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int retcode;
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pam_handle_t *pamh = NULL;
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struct pam_conv conv = { misc_conv, NULL };
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- pid_t childPid;
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+ struct sigaction sa, oldsa_hup, oldsa_term;
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#else
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char *salt, *pp;
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#endif
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@@ -1023,7 +1037,18 @@
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* We must fork before setuid() because we need to call
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* pam_close_session() as root.
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*/
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+ memset(&sa, 0, sizeof(sa));
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+ sa.sa_handler = SIG_IGN;
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+ sigaction(SIGINT, &sa, NULL);
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+
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+ sigaction(SIGHUP, &sa, &oldsa_hup); /* ignore while we detach from the tty */
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+ ioctl(0, TIOCNOTTY, NULL);
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+
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+ sa.sa_handler = parent_sig_handler;
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+ sigaction(SIGHUP, &sa, NULL);
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+ sigaction(SIGTERM, &sa, &oldsa_term);
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+ closelog();
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childPid = fork();
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if (childPid < 0) {
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int errsv = errno;
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@@ -1034,19 +1059,20 @@
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}
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if (childPid) {
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- /* parent - wait for child to finish, then cleanup session */
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- signal(SIGHUP, SIG_IGN);
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- signal(SIGINT, SIG_IGN);
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- signal(SIGQUIT, SIG_IGN);
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- signal(SIGTSTP, SIG_IGN);
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- signal(SIGTTIN, SIG_IGN);
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- signal(SIGTTOU, SIG_IGN);
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-
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- wait(NULL);
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+ close(0); close(1); close(2);
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+ sa.sa_handler = SIG_IGN;
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+ sigaction(SIGQUIT, &sa, NULL);
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+ sigaction(SIGINT, &sa, NULL);
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+ while(wait(NULL) == -1 && errno == EINTR) /**/ ;
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+ openlog("login", LOG_ODELAY, LOG_AUTHPRIV);
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PAM_END;
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exit(0);
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}
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+ sigaction(SIGHUP, &oldsa_hup, NULL);
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+ sigaction(SIGTERM, &oldsa_term, NULL);
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+ if(got_sig) exit(1);
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+
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/* child */
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/*
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* Problem: if the user's shell is a shell like ash that doesnt do
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@@ -1058,14 +1084,15 @@
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setsid();
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/* make sure we have a controlling tty */
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- opentty(ttyn);
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openlog("login", LOG_ODELAY, LOG_AUTHPRIV); /* reopen */
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/*
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* TIOCSCTTY: steal tty from other process group.
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*/
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- if (ioctl(0, TIOCSCTTY, 1))
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- syslog(LOG_ERR, _("TIOCSCTTY failed: %m"));
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+ if (ioctl(0, TIOCSCTTY, (char *)1)) {
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+ syslog(LOG_ERR, _("Couldn't set controlling terminal: %s"), strerror(errno));
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+ exit(1);
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+ }
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#endif
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signal(SIGINT, SIG_DFL);
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