diff options
Diffstat (limited to 'login')
| -rw-r--r-- | login/Makefile | 16 | ||||
| -rw-r--r-- | login/forkpty.c | 56 | ||||
| -rw-r--r-- | login/openpty.c | 73 | ||||
| -rw-r--r-- | login/programs/pt_chown.c | 88 | ||||
| -rw-r--r-- | login/pty-internal.h | 41 | ||||
| -rw-r--r-- | login/utmp_file.c | 10 |
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 |