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-rw-r--r--login/Makefile16
-rw-r--r--login/forkpty.c56
-rw-r--r--login/openpty.c73
-rw-r--r--login/programs/pt_chown.c88
-rw-r--r--login/pty-internal.h41
-rw-r--r--login/utmp_file.c10
6 files changed, 275 insertions, 9 deletions
diff --git a/login/Makefile b/login/Makefile
index 3842b2f..04c6eeb 100644
--- a/login/Makefile
+++ b/login/Makefile
@@ -1,4 +1,4 @@
-# Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+# Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
# The GNU C Library is free software; you can redistribute it and/or
@@ -25,10 +25,14 @@ subdir := login
headers := utmp.h bits/utmp.h utmpx.h bits/utmpx.h lastlog.h pty.h
routines := getutent getutent_r getutid getutline getutid_r getutline_r \
- utmp_file utmp_daemon utmpname updwtmp
+ utmp_file utmp_daemon utmpname updwtmp \
+ getpt grantpt unlockpt ptsname
-others = utmpd utmpdump
+CFLAGS-grantpt.c = -DLIBEXECDIR='"$(libexecdir)"'
+
+others = utmpd utmpdump pt_chown
install-sbin = utmpd
+install-others = $(inst_libexecdir)/pt_chown
utmpd-routines := connection database error request xtmp
extra-objs := $(utmpd-routines:=.o)
@@ -42,11 +46,15 @@ vpath %.c programs
extra-libs := libutil
extra-libs-others := $(extra-libs)
-libutil-routines:= login login_tty logout logwtmp pty
+libutil-routines:= login login_tty logout logwtmp openpty forkpty
libutil-map := libutil.map
include ../Rules
+# pt_chown needs to be setuid root.
+$(inst_libexecdir)/pt_chown: $(objpfx)pt_chown
+ $(INSTALL) -m 4755 -o root $< $@
+
$(objpfx)utmpd: $(utmpd-routines:%=$(objpfx)%.o)
# Depend on libc.so so a DT_NEEDED is generated in the shared objects.
diff --git a/login/forkpty.c b/login/forkpty.c
new file mode 100644
index 0000000..e0e3cce
--- /dev/null
+++ b/login/forkpty.c
@@ -0,0 +1,56 @@
+/* Copyright (C) 1998 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <sys/types.h>
+#include <termios.h>
+#include <unistd.h>
+#include <utmp.h>
+#include <pty.h>
+
+int
+forkpty (amaster, name, termp, winp)
+ int *amaster;
+ char *name;
+ struct termios *termp;
+ struct winsize *winp;
+{
+ int master, slave, pid;
+
+ if (openpty (&master, &slave, name, termp, winp) == -1)
+ return -1;
+
+ switch (pid = fork ())
+ {
+ case -1:
+ return -1;
+ case 0:
+ /* Child. */
+ close (master);
+ if (login_tty (slave))
+ _exit (1);
+
+ return 0;
+ default:
+ /* Parent. */
+ *amaster = master;
+ close (slave);
+
+ return pid;
+ }
+}
diff --git a/login/openpty.c b/login/openpty.c
new file mode 100644
index 0000000..12e8207
--- /dev/null
+++ b/login/openpty.c
@@ -0,0 +1,73 @@
+/* Copyright (C) 1998 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <fcntl.h>
+#include <pty.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <unistd.h>
+#include <sys/types.h>
+
+#include "pty-internal.h"
+
+int
+openpty (pmast, pslave, pname, tio, wins)
+ int *pmast;
+ int *pslave;
+ char *pname;
+ struct termios *tio;
+ struct winsize *wins;
+{
+ int pfd, tfd;
+ char name[PTYNAMELEN];
+
+ pfd = getpt ();
+ if (pfd == -1)
+ return -1;
+
+ if (grantpt (pfd))
+ goto bail;
+
+ if (unlockpt (pfd))
+ goto bail;
+
+ if (!ptsname_r (pfd, name, PTYNAMELEN))
+ goto bail;
+
+ tfd = open (name, O_RDWR);
+ if (tfd == -1)
+ goto bail;
+
+ /* XXX Should we ignore errors here? */
+ if(tio)
+ tcsetattr (tfd, TCSAFLUSH, tio);
+ if (wins)
+ ioctl (tfd, TIOCSWINSZ, wins);
+
+ *pmast = pfd;
+ *pslave = tfd;
+ if (pname != NULL)
+ strcpy (pname, name);
+ return 0;
+
+bail:
+ close (pfd);
+ return -1;
+}
diff --git a/login/programs/pt_chown.c b/login/programs/pt_chown.c
new file mode 100644
index 0000000..dbf79fc
--- /dev/null
+++ b/login/programs/pt_chown.c
@@ -0,0 +1,88 @@
+/* Copyright (C) 1998 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by C. Scott Ananian <cananian@alumni.princeton.edu>, 1998.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+/* pt_chmod.c ... securely implement grantpt in user-land. */
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdio.h>
+#include <grp.h>
+
+#include "pty-internal.h"
+#define Str(x) _Str(x)
+#define _Str(x) #x
+
+void
+usage (void)
+{
+ fprintf (stderr, _("usage: pt_chown FD>&%s\n"
+ "This program is used internally by grantpt(3).\n"),
+ Str (PTY_FD));
+ exit (0);
+}
+
+void
+bad_installation (void)
+{
+ fputs (_("pt_chown: installation problem: "
+ "This program needs to be setuid root.\n"), stderr);
+ exit (FAIL_EXEC);
+}
+
+int
+main (int argc, char **argv)
+{
+ struct group *grp;
+ struct stat s;
+ char *pty;
+ gid_t gid;
+ uid_t uid;
+
+ if (argc != 1)
+ usage ();
+ if (geteuid () != 0)
+ bad_installation ();
+
+ grp = getgrnam (TTY_GROUP);
+ gid = grp ? grp->gr_gid : getgid ();
+ uid = getuid ();
+
+ /* Check that fd is a valid pty master -- call ptsname(). */
+ pty = ptsname (PTY_FD);
+ if (pty == NULL)
+ return errno == EBADF ? FAIL_EBADF : FAIL_EINVAL;
+ close (PTY_FD);
+
+ /* Check that target file is a character device. */
+ if (stat (pty, &s))
+ return FAIL_EINVAL; /* This should only fail if pty doesn't exist. */
+ if (!S_ISCHR (s.st_mode))
+ return FAIL_EINVAL;
+
+ if (chmod (pty, 0620))
+ return FAIL_EACCES; /* XXX: Probably not true. */
+
+ if (chown (pty, uid, gid))
+ return FAIL_EACCES;
+
+ return 0;
+}
diff --git a/login/pty-internal.h b/login/pty-internal.h
new file mode 100644
index 0000000..c185886
--- /dev/null
+++ b/login/pty-internal.h
@@ -0,0 +1,41 @@
+/* Copyright (C) 1998 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+/* Internal constants used by the pseudoterminal handling code. */
+
+#ifndef _PTY_INTERNAL_H
+#define _PTY_INTERNAL_H 1
+
+/* Length of a buffer to hold a pty name. */
+#define PTYNAMELEN 15 /* "/dev/pts/65535$" */
+
+/* Which group should pty slaves belong to: */
+#define TTY_GROUP "tty"
+
+/* Communication between grantpt and pt_chown. */
+#define PTY_FD 3
+enum /* failure modes */
+{
+ FAIL_EBADF = 1,
+ FAIL_EINVAL,
+ FAIL_EACCES,
+ FAIL_EXEC
+};
+
+#endif
diff --git a/login/utmp_file.c b/login/utmp_file.c
index bea6364..d25dcb8 100644
--- a/login/utmp_file.c
+++ b/login/utmp_file.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>
and Paul Janzen <pcj@primenet.com>, 1996.
@@ -390,12 +390,12 @@ pututline_file (const struct utmp *data)
}
/* Write the new data. */
- if (write (file_fd, data, sizeof (struct utmp)) != sizeof (struct utmp)
+ if (write (file_fd, data, sizeof (struct utmp)) != sizeof (struct utmp))
+ {
/* If we appended a new record this is only partially written.
Remove it. */
- && found < 0)
- {
- (void) ftruncate (file_fd, file_offset);
+ if (found < 0)
+ (void) ftruncate (file_fd, file_offset);
pbuf = NULL;
}
else