su: add PTY support
Signed-off-by: Karel Zak <kzak@redhat.com>
This commit is contained in:
Karel Zak
parent
04845ec766
commit
eb7d0ad0fe
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@ -146,6 +146,9 @@ su_LDADD = $(LDADD) libcommon.la -lpam
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if HAVE_LINUXPAM
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su_LDADD += -lpam_misc
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endif
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if HAVE_UTIL
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su_LDADD += -lutil
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endif
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endif # BUILD_SU
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@ -3,7 +3,7 @@
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*
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* Copyright (C) 1992-2006 Free Software Foundation, Inc.
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* Copyright (C) 2012 SUSE Linux Products GmbH, Nuernberg
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* Copyright (C) 2016 Karel Zak <kzak@redhat.com>
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* Copyright (C) 2016-2017 Karel Zak <kzak@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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@ -37,6 +37,14 @@
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#include <syslog.h>
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#include <utmpx.h>
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#if defined(HAVE_LIBUTIL) && defined(HAVE_PTY_H) && defined(HAVE_SYS_SIGNALFD_H)
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# include <pty.h>
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# include <poll.h>
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# include <sys/signalfd.h>
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# include "all-io.h"
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# define USE_PTY
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#endif
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#include "err.h"
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#include <stdbool.h>
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@ -66,6 +74,7 @@ UL_DEBUG_DEFINE_MASKNAMES(su) = UL_DEBUG_EMPTY_MASKNAMES;
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#define SU_DEBUG_LOG (1 << 5)
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#define SU_DEBUG_MISC (1 << 6)
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#define SU_DEBUG_SIG (1 << 7)
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#define SU_DEBUG_PTY (1 << 8)
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#define SU_DEBUG_ALL 0xFFFF
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#define DBG(m, x) __UL_DBG(su, SU_DEBUG_, m, x)
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@ -126,7 +135,16 @@ struct su_context {
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pid_t child; /* fork() baby */
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struct sigaction oldact[SIGNALS_IDX_COUNT]; /* original sigactions indexed by SIG*_IDX */
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sigset_t oldsig; /* original signal mask */
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#ifdef USE_PTY
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struct termios stdin_attrs; /* stdin and slave terminal runtime attributes */
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int pty_master;
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int pty_slave;
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int pty_sigfd; /* signalfd() */
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int poll_timeout;
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struct winsize win; /* terminal window size */
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#endif
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unsigned int runuser :1, /* flase=su, true=runuser */
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runuser_uopt :1, /* runuser -u specified */
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isterm :1, /* is stdin terminal? */
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@ -164,6 +182,383 @@ static void init_tty(struct su_context *su)
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get_terminal_name(NULL, &su->tty_name, &su->tty_number);
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}
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static int wait_for_child(struct su_context *su)
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{
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pid_t pid = (pid_t) -1;;
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int status = 0;
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if (su->child != (pid_t) -1) {
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DBG(SIG, ul_debug("waiting for child [%d]...", su->child));
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for (;;) {
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pid = waitpid(su->child, &status, WUNTRACED);
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if (pid != (pid_t) - 1 && WIFSTOPPED(status)) {
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kill(getpid(), SIGSTOP);
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/* once we get here, we must have resumed */
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kill(pid, SIGCONT);
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} else
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break;
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}
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}
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if (pid != (pid_t) -1) {
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if (WIFSIGNALED(status)) {
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fprintf(stderr, "%s%s\n",
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strsignal(WTERMSIG(status)),
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WCOREDUMP(status) ? _(" (core dumped)")
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: "");
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status = WTERMSIG(status) + 128;
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} else
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status = WEXITSTATUS(status);
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DBG(SIG, ul_debug("child %d is dead", su->child));
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su->child = (pid_t) -1; /* Don't use the PID anymore! */
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} else if (caught_signal)
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status = caught_signal + 128;
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else
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status = 1;
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DBG(SIG, ul_debug("status=%d", status));
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return status;
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}
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#ifdef USE_PTY
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static void pty_init_slave(struct su_context *su)
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{
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DBG(PTY, ul_debug("initialize slave"));
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ioctl(su->pty_slave, TIOCSCTTY, 0);
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close(su->pty_master);
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dup2(su->pty_slave, STDIN_FILENO);
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dup2(su->pty_slave, STDOUT_FILENO);
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dup2(su->pty_slave, STDERR_FILENO);
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close(su->pty_slave);
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close(su->pty_sigfd);
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su->pty_slave = -1;
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su->pty_master = -1;
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su->pty_sigfd = -1;
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sigprocmask(SIG_SETMASK, &su->oldsig, NULL);
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DBG(PTY, ul_debug("... initialize slave done"));
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}
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static void pty_create(struct su_context *su)
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{
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struct termios slave_attrs;
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int rc;
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if (su->isterm) {
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DBG(PTY, ul_debug("create for terminal"));
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struct winsize win;
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/* original setting of the current terminal */
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if (tcgetattr(STDIN_FILENO, &su->stdin_attrs) != 0)
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err(EXIT_FAILURE, _("failed to get terminal attributes"));
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/* reuse the current terminal setting for slave */
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slave_attrs = su->stdin_attrs;
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cfmakeraw(&slave_attrs);
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ioctl(STDIN_FILENO, TIOCGWINSZ, (char *)&su->win);
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/* create master+slave */
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rc = openpty(&su->pty_master, &su->pty_slave, NULL, &slave_attrs, &win);
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} else {
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DBG(PTY, ul_debug("create for non-terminal"));
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rc = openpty(&su->pty_master, &su->pty_slave, NULL, NULL, NULL);
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/* set slave attributes */
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if (rc < 0) {
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tcgetattr(su->pty_slave, &slave_attrs);
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cfmakeraw(&slave_attrs);
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tcsetattr(su->pty_slave, TCSANOW, &slave_attrs);
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}
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}
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if (rc < 0)
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err(EXIT_FAILURE, _("failed to create pseudo-terminal"));
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DBG(PTY, ul_debug("pty setup done [master=%d, slave=%d]", su->pty_master, su->pty_slave));
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}
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static void pty_cleanup(struct su_context *su)
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{
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if (su->pty_master == -1)
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return;
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DBG(PTY, ul_debug("cleanup"));
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if (su->isterm)
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tcsetattr(STDIN_FILENO, TCSADRAIN, &su->stdin_attrs);
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}
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static int write_output(char *obuf, ssize_t bytes)
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{
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DBG(PTY, ul_debug(" writing output"));
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if (write_all(STDOUT_FILENO, obuf, bytes)) {
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DBG(PTY, ul_debug(" writing output *failed*"));
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warn(_("write failed"));
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return -errno;
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}
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return 0;
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}
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static int write_to_child(struct su_context *su,
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char *buf, size_t bufsz)
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{
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return write_all(su->pty_master, buf, bufsz);
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}
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/*
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* The su(1) is usually faster than shell, so it's a good idea to wait until
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* the previous message has been already read by shell from slave before we
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* write to master. This is necessary especially for EOF situation when we can
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* send EOF to master before shell is fully initialized, to workaround this
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* problem we wait until slave is empty. For example:
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*
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* echo "date" | su
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*
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* Unfortunately, the child (usually shell) can ignore stdin at all, so we
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* don't wait forever to avoid dead locks...
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*
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* Note that su --pty is primarily designed for interactive sessions as it
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* maintains master+slave tty stuff within the session. Use pipe to write to
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* su(1) and assume non-interactive (tee-like) behavior is NOT well
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* supported.
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*/
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static void write_eof_to_child(struct su_context *su)
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{
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unsigned int tries = 0;
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struct pollfd fds[] = {
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{ .fd = su->pty_slave, .events = POLLIN }
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};
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char c = DEF_EOF;
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DBG(PTY, ul_debug(" waiting for empty slave"));
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while (poll(fds, 1, 10) == 1 && tries < 8) {
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DBG(PTY, ul_debug(" slave is not empty"));
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xusleep(250000);
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tries++;
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}
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if (tries < 8)
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DBG(PTY, ul_debug(" slave is empty now"));
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DBG(PTY, ul_debug(" sending EOF to master"));
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write_to_child(su, &c, sizeof(char));
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}
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static int pty_handle_io(struct su_context *su, int fd, int *eof)
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{
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char buf[BUFSIZ];
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ssize_t bytes;
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DBG(PTY, ul_debug("%d FD active", fd));
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*eof = 0;
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/* read from active FD */
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bytes = read(fd, buf, sizeof(buf));
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if (bytes < 0) {
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if (errno == EAGAIN || errno == EINTR)
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return 0;
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return -errno;
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}
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if (bytes == 0) {
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*eof = 1;
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return 0;
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}
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/* from stdin (user) to command */
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if (fd == STDIN_FILENO) {
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DBG(PTY, ul_debug(" stdin --> master %zd bytes", bytes));
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if (write_to_child(su, buf, bytes)) {
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warn(_("write failed"));
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return -errno;
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}
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/* without sync write_output() will write both input &
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* shell output that looks like double echoing */
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fdatasync(su->pty_master);
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/* from command (master) to stdout */
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} else if (fd == su->pty_master) {
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DBG(PTY, ul_debug(" master --> stdout %zd bytes", bytes));
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write_output(buf, bytes);
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}
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return 0;
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}
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static int pty_handle_signal(struct su_context *su, int fd)
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{
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struct signalfd_siginfo info;
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ssize_t bytes;
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DBG(SIG, ul_debug("signal FD %d active", fd));
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bytes = read(fd, &info, sizeof(info));
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if (bytes != sizeof(info)) {
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if (bytes < 0 && (errno == EAGAIN || errno == EINTR))
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return 0;
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return -errno;
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}
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switch (info.ssi_signo) {
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case SIGCHLD:
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DBG(SIG, ul_debug(" get signal SIGCHLD"));
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wait_for_child(su);
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su->poll_timeout = 10;
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return 0;
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case SIGWINCH:
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DBG(SIG, ul_debug(" get signal SIGWINCH"));
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if (su->isterm) {
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ioctl(STDIN_FILENO, TIOCGWINSZ, (char *)&su->win);
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ioctl(su->pty_slave, TIOCSWINSZ, (char *)&su->win);
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}
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break;
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case SIGTERM:
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/* fallthrough */
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case SIGINT:
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/* fallthrough */
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case SIGQUIT:
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DBG(SIG, ul_debug(" get signal SIG{TERM,INT,QUIT}"));
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caught_signal = info.ssi_signo;
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/* Child termination is going to generate SIGCHILD (see above) */
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kill(su->child, SIGTERM);
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break;
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default:
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abort();
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}
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return 0;
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}
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static void pty_proxy_master(struct su_context *su)
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{
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sigset_t ourset;
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int rc = 0, ret, ignore_stdin = 0, eof = 0;
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enum {
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POLLFD_SIGNAL = 0,
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POLLFD_MASTER,
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POLLFD_STDIN /* optional; keep it last, see ignore_stdin */
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};
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struct pollfd pfd[] = {
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[POLLFD_SIGNAL] = { .fd = -1, .events = POLLIN | POLLERR | POLLHUP },
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[POLLFD_MASTER] = { .fd = su->pty_master, .events = POLLIN | POLLERR | POLLHUP },
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[POLLFD_STDIN] = { .fd = STDIN_FILENO, .events = POLLIN | POLLERR | POLLHUP }
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};
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/* for PTY mode we use signalfd
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*
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* TODO: script(1) initializes this FD before fork, good or bad idea?
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*/
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sigfillset(&ourset);
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if (sigprocmask(SIG_BLOCK, &ourset, &su->oldsig)) {
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warn(_("cannot block signals"));
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caught_signal = true;
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return;
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}
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sigemptyset(&ourset);
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sigaddset(&ourset, SIGCHLD);
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sigaddset(&ourset, SIGWINCH);
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sigaddset(&ourset, SIGALRM);
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sigaddset(&ourset, SIGTERM);
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sigaddset(&ourset, SIGINT);
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sigaddset(&ourset, SIGQUIT);
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if ((su->pty_sigfd = signalfd(-1, &ourset, SFD_CLOEXEC)) < 0) {
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warn(("cannot create signal file descriptor"));
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caught_signal = true;
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return;
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}
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pfd[POLLFD_SIGNAL].fd = su->pty_sigfd;
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su->poll_timeout = -1;
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while (!caught_signal) {
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size_t i;
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int errsv;
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DBG(PTY, ul_debug("calling poll()"));
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/* wait for input or signal */
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ret = poll(pfd, ARRAY_SIZE(pfd) - ignore_stdin, su->poll_timeout);
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errsv = errno;
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DBG(PTY, ul_debug("poll() rc=%d", ret));
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if (ret < 0) {
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if (errsv == EAGAIN)
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continue;
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warn(_("poll failed"));
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break;
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}
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if (ret == 0) {
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DBG(PTY, ul_debug("leaving poll() loop [timeout=%d]", su->poll_timeout));
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break;
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}
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for (i = 0; i < ARRAY_SIZE(pfd) - ignore_stdin; i++) {
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rc = 0;
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if (pfd[i].revents == 0)
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continue;
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DBG(PTY, ul_debug(" active pfd[%s].fd=%d %s %s %s",
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i == POLLFD_STDIN ? "stdin" :
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i == POLLFD_MASTER ? "master" :
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i == POLLFD_SIGNAL ? "signal" : "???",
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pfd[i].fd,
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pfd[i].revents & POLLIN ? "POLLIN" : "",
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pfd[i].revents & POLLHUP ? "POLLHUP" : "",
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pfd[i].revents & POLLERR ? "POLLERR" : ""));
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switch (i) {
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case POLLFD_STDIN:
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case POLLFD_MASTER:
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/* data */
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if (pfd[i].revents & POLLIN)
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rc = pty_handle_io(su, pfd[i].fd, &eof);
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/* EOF maybe detected by two ways:
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* A) poll() return POLLHUP event after close()
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* B) read() returns 0 (no data) */
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if ((pfd[i].revents & POLLHUP) || eof) {
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DBG(PTY, ul_debug(" ignore FD"));
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pfd[i].fd = -1;
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/* according to man poll() set FD to -1 can't be used to ignore
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* STDIN, so let's remove the FD from pool at all */
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if (i == POLLFD_STDIN) {
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ignore_stdin = 1;
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write_eof_to_child(su);
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DBG(PTY, ul_debug(" ignore STDIN"));
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}
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}
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continue;
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case POLLFD_SIGNAL:
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rc = pty_handle_signal(su, pfd[i].fd);
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break;
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}
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if (rc)
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break;
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}
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}
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DBG(PTY, ul_debug("poll() done [signal=%d, rc=%d]", caught_signal, rc));
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}
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#else
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# define pty_create
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# define pty_cleanup
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# define pty_init_slave
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# define pty_proxy_master
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#endif /* USE_PTY */
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/* Log the fact that someone has run su to the user given by PW;
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if SUCCESSFUL is true, they gave the correct password, etc. */
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@ -333,45 +728,6 @@ static void supam_open_session(struct su_context *su)
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su->pam_has_session = 1;
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}
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static int wait_for_child(struct su_context *su)
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{
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pid_t pid = (pid_t) -1;;
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int status = 0;
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if (su->child != (pid_t) -1) {
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DBG(SIG, ul_debug("waiting for child [%d]...", su->child));
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for (;;) {
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pid = waitpid(su->child, &status, WUNTRACED);
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if (pid != (pid_t) - 1 && WIFSTOPPED(status)) {
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kill(getpid(), SIGSTOP);
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/* once we get here, we must have resumed */
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kill(pid, SIGCONT);
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} else
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break;
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}
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}
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if (pid != (pid_t) -1) {
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if (WIFSIGNALED(status)) {
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fprintf(stderr, "%s%s\n",
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strsignal(WTERMSIG(status)),
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WCOREDUMP(status) ? _(" (core dumped)")
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: "");
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||||
status = WTERMSIG(status) + 128;
|
||||
} else
|
||||
status = WEXITSTATUS(status);
|
||||
|
||||
DBG(SIG, ul_debug("child %d is dead", su->child));
|
||||
su->child = (pid_t) -1; /* Don't use the PID anymore! */
|
||||
} else if (caught_signal)
|
||||
status = caught_signal + 128;
|
||||
else
|
||||
status = 1;
|
||||
|
||||
DBG(SIG, ul_debug("status=%d", status));
|
||||
return status;
|
||||
}
|
||||
|
||||
static void parent_setup_signals(struct su_context *su)
|
||||
{
|
||||
sigset_t ourset;
|
||||
|
|
@ -384,7 +740,7 @@ static void parent_setup_signals(struct su_context *su)
|
|||
DBG(SIG, ul_debug("initialize signals"));
|
||||
|
||||
sigfillset(&ourset);
|
||||
if (sigprocmask(SIG_BLOCK, &ourset, NULL)) {
|
||||
if (sigprocmask(SIG_BLOCK, &ourset, &su->oldsig)) {
|
||||
warn(_("cannot block signals"));
|
||||
caught_signal = true;
|
||||
}
|
||||
|
|
@ -449,9 +805,17 @@ static void create_watching_parent(struct su_context *su)
|
|||
|
||||
DBG(MISC, ul_debug("forking..."));
|
||||
|
||||
if (su->pty)
|
||||
/* create master and slave terminals */
|
||||
pty_create(su);
|
||||
|
||||
fflush(stdout); /* ??? */
|
||||
|
||||
switch ((int) (su->child = fork())) {
|
||||
case -1: /* error */
|
||||
supam_cleanup(su, PAM_ABORT);
|
||||
if (su->pty)
|
||||
pty_cleanup(su);
|
||||
err(EXIT_FAILURE, _("cannot create child process"));
|
||||
break;
|
||||
|
||||
|
|
@ -471,7 +835,10 @@ static void create_watching_parent(struct su_context *su)
|
|||
if (chdir("/") != 0)
|
||||
warn(_("cannot change directory to %s"), "/");
|
||||
|
||||
parent_setup_signals(su);
|
||||
if (su->pty)
|
||||
pty_proxy_master(su);
|
||||
else
|
||||
parent_setup_signals(su);
|
||||
|
||||
/*
|
||||
* Wait for child
|
||||
|
|
@ -523,6 +890,8 @@ static void create_watching_parent(struct su_context *su)
|
|||
kill(getpid(), caught_signal);
|
||||
}
|
||||
|
||||
if (su->pty)
|
||||
pty_cleanup(su);
|
||||
DBG(MISC, ul_debug("exiting [rc=%d]", status));
|
||||
exit(status);
|
||||
}
|
||||
|
|
@ -809,7 +1178,12 @@ int su_main(int argc, char **argv, int mode)
|
|||
.conv = { supam_conv, NULL },
|
||||
.runuser = (mode == RUNUSER_MODE ? 1 : 0),
|
||||
.change_environment = 1,
|
||||
.new_user = DEFAULT_USER
|
||||
.new_user = DEFAULT_USER,
|
||||
#ifdef USE_PTY
|
||||
.pty_master = -1,
|
||||
.pty_slave = -1,
|
||||
.pty_sigfd = -1,
|
||||
#endif
|
||||
}, *su = &_su;
|
||||
|
||||
int optc;
|
||||
|
|
@ -884,7 +1258,11 @@ int su_main(int argc, char **argv, int mode)
|
|||
break;
|
||||
|
||||
case 'P':
|
||||
#ifdef USE_PTY
|
||||
su->pty = 1;
|
||||
#else
|
||||
err(EXIT_FAILURE, _("--pty is not implemented"));
|
||||
#endif
|
||||
break;
|
||||
|
||||
case 's':
|
||||
|
|
@ -1008,9 +1386,12 @@ int su_main(int argc, char **argv, int mode)
|
|||
/* Now we're in the child. */
|
||||
|
||||
change_identity(su->pwd);
|
||||
if (!su->same_session)
|
||||
if (!su->same_session || su->pty)
|
||||
setsid();
|
||||
|
||||
if (su->pty)
|
||||
pty_init_slave(su);
|
||||
|
||||
/* Set environment after pam_open_session, which may put KRB5CCNAME
|
||||
into the pam_env, etc. */
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue