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Backport support for update-game-score to run sgid instead of suid.
This comprises parts of the following commits from upstream git:
commit 74ab488ff2e57f31eb5290266f0f3b1995ebf83e
Author: Paul Eggert <eggert@cs.ucla.edu>
Date: Thu Jan 22 00:39:30 2015 -0800
Check exit statuses in lib-src/Makefile
commit 7f4e7dd378c456b498c270b47b46aaae365a72ab
Author: Ulrich Müller <ulm@gentoo.org>
Date: Thu Jan 22 08:24:42 2015 +0100
Don't fail if chown or chgrp for 'update-game-score' is unsuccessful.
commit 20f66485526b69eb26f2e70bd835a5e1333559d5
Author: Ulrich Müller <ulm@gentoo.org>
Date: Fri Jan 16 09:25:25 2015 +0100
Allow update-game-score to run sgid instead of suid.
--- emacs-24.4-orig/configure.ac
+++ emacs-24.4/configure.ac
@@ -313,10 +313,25 @@
fi
AC_ARG_WITH(gameuser,dnl
-[AS_HELP_STRING([--with-gameuser=USER],[user for shared game score files])])
-test "X${with_gameuser}" != X && test "${with_gameuser}" != yes \
- && gameuser="${with_gameuser}"
-test "X$gameuser" = X && gameuser=games
+[AS_HELP_STRING([--with-gameuser=USER_OR_GROUP],
+ [user for shared game score files.
+ An argument prefixed by ':' specifies a group instead.])])
+gameuser=
+gamegroup=
+case ${with_gameuser} in
+ no) ;;
+ "" | yes)
+ AC_MSG_CHECKING([whether a 'games' user exists])
+ if id -u games >/dev/null 2>&1; then
+ AC_MSG_RESULT([yes])
+ gameuser=games
+ else
+ AC_MSG_RESULT([no])
+ fi
+ ;;
+ :*) gamegroup=`echo "${with_gameuser}" | sed -e "s/://"` ;;
+ *) gameuser=${with_gameuser} ;;
+esac
AC_ARG_WITH([gnustep-conf],dnl
[AS_HELP_STRING([--with-gnustep-conf=FILENAME],
@@ -4658,6 +4673,7 @@
AC_SUBST(bitmapdir)
AC_SUBST(gamedir)
AC_SUBST(gameuser)
+AC_SUBST(gamegroup)
## FIXME? Nothing uses @LD_SWITCH_X_SITE@.
## src/Makefile.in did add LD_SWITCH_X_SITE (as a cpp define) to the
## end of LIBX_BASE, but nothing ever set it.
--- emacs-24.4-orig/lib-src/Makefile.in
+++ emacs-24.4/lib-src/Makefile.in
@@ -101,6 +101,7 @@
gamedir=@gamedir@
gameuser=@gameuser@
+gamegroup=@gamegroup@
# ==================== Utility Programs for the Build =================
@@ -243,10 +244,25 @@
umask 022; ${MKDIR_P} "$(DESTDIR)${gamedir}"; \
touch "$(DESTDIR)${gamedir}/snake-scores"; \
touch "$(DESTDIR)${gamedir}/tetris-scores"
- -if chown ${gameuser} "$(DESTDIR)${archlibdir}/update-game-score${EXEEXT}" && chmod u+s "$(DESTDIR)${archlibdir}/update-game-score${EXEEXT}"; then \
- chown ${gameuser} "$(DESTDIR)${gamedir}"; \
+ifneq ($(gameuser),)
+ if chown ${gameuser} \
+ "$(DESTDIR)${archlibdir}/update-game-score${EXEEXT}" && \
+ chmod u+s,go-r \
+ "$(DESTDIR)${archlibdir}/update-game-score${EXEEXT}"; \
+ then \
+ chown ${gameuser} "$(DESTDIR)${gamedir}" && \
+ chmod u=rwx,g=rx,o=rx "$(DESTDIR)${gamedir}"; \
+ fi
+else ifneq ($(gamegroup),)
+ if chgrp ${gamegroup} \
+ "$(DESTDIR)${archlibdir}/update-game-score${EXEEXT}" && \
+ chmod g+s,o-r \
+ "$(DESTDIR)${archlibdir}/update-game-score${EXEEXT}"; \
+ then \
+ chgrp ${gamegroup} "$(DESTDIR)${gamedir}" && \
chmod u=rwx,g=rwx,o=rx "$(DESTDIR)${gamedir}"; \
fi
+endif
exp_archlibdir=`cd "$(DESTDIR)${archlibdir}" && /bin/pwd`; \
if [ "$$exp_archlibdir" != "`cd ${srcdir} && /bin/pwd`" ]; then \
for file in ${SCRIPTS}; do \
--- emacs-24.4-orig/lib-src/update-game-score.c
+++ emacs-24.4/lib-src/update-game-score.c
@@ -21,8 +21,8 @@
/* This program allows a game to securely and atomically update a
- score file. It should be installed setuid, owned by an appropriate
- user like `games'.
+ score file. It should be installed either setuid or setgid, owned
+ by an appropriate user or group like `games'.
Alternatively, it can be compiled without HAVE_SHARED_GAME_DIR
defined, and in that case it will store scores in the user's home
@@ -89,7 +89,7 @@
ptrdiff_t *size, struct score_entry const *newscore);
static void sort_scores (struct score_entry *scores, ptrdiff_t count,
bool reverse);
-static int write_scores (const char *filename,
+static int write_scores (const char *filename, mode_t mode,
const struct score_entry *scores, ptrdiff_t count);
static _Noreturn void
@@ -122,18 +122,19 @@
}
static const char *
-get_prefix (bool running_suid, const char *user_prefix)
+get_prefix (bool privileged, const char *user_prefix)
{
- if (!running_suid && user_prefix == NULL)
- lose ("Not using a shared game directory, and no prefix given.");
- if (running_suid)
+ if (privileged)
{
#ifdef HAVE_SHARED_GAME_DIR
return HAVE_SHARED_GAME_DIR;
#else
- lose ("This program was compiled without HAVE_SHARED_GAME_DIR,\n and should not be suid.");
+ lose ("This program was compiled without HAVE_SHARED_GAME_DIR,\n"
+ "and should not run with elevated privileges.");
#endif
}
+ if (user_prefix == NULL)
+ lose ("Not using a shared game directory, and no prefix given.");
return user_prefix;
}
@@ -141,7 +142,7 @@
main (int argc, char **argv)
{
int c;
- bool running_suid;
+ bool running_suid, running_sgid;
void *lockstate;
char *scorefile;
char *nl;
@@ -183,8 +184,11 @@
usage (EXIT_FAILURE);
running_suid = (getuid () != geteuid ());
+ running_sgid = (getgid () != getegid ());
+ if (running_suid && running_sgid)
+ lose ("This program can run either suid or sgid, but not both.");
- prefix = get_prefix (running_suid, user_prefix);
+ prefix = get_prefix (running_suid || running_sgid, user_prefix);
scorefile = malloc (strlen (prefix) + strlen (argv[optind]) + 2);
if (!scorefile)
@@ -234,7 +238,8 @@
scores += scorecount - max_scores;
scorecount = max_scores;
}
- if (write_scores (scorefile, scores, scorecount) < 0)
+ if (write_scores (scorefile, running_sgid ? 0664 : 0644,
+ scores, scorecount) < 0)
{
unlock_file (scorefile, lockstate);
lose_syserr ("Failed to write scores file");
@@ -429,8 +434,8 @@
}
static int
-write_scores (const char *filename, const struct score_entry *scores,
- ptrdiff_t count)
+write_scores (const char *filename, mode_t mode,
+ const struct score_entry *scores, ptrdiff_t count)
{
int fd;
FILE *f;
@@ -444,7 +449,7 @@
if (fd < 0)
return -1;
#ifndef DOS_NT
- if (fchmod (fd, 0644) != 0)
+ if (fchmod (fd, mode) != 0)
return -1;
#endif
f = fdopen (fd, "w");
@@ -460,7 +465,7 @@
if (rename (tempfile, filename) != 0)
return -1;
#ifdef DOS_NT
- if (chmod (filename, 0644) < 0)
+ if (chmod (filename, mode) < 0)
return -1;
#endif
return 0;
--- emacs-24.4-orig/lisp/play/gamegrid.el
+++ emacs-24.4/lisp/play/gamegrid.el
@@ -486,13 +486,13 @@
(not (zerop (logand (file-modes
(expand-file-name "update-game-score"
exec-directory))
- #o4000)))))
+ #o6000)))))
(cond ((file-name-absolute-p file)
(gamegrid-add-score-insecure file score))
((and gamegrid-shared-game-dir
(file-exists-p (expand-file-name file shared-game-score-directory)))
- ;; Use the setuid "update-game-score" program to update a
- ;; system-wide score file.
+ ;; Use the setuid (or setgid) "update-game-score" program
+ ;; to update a system-wide score file.
(gamegrid-add-score-with-update-game-score-1 file
(expand-file-name file shared-game-score-directory) score))
;; Else: Add the score to a score file in the user's home
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