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/*
Copyright (C) 2011 ABRT Team
Copyright (C) 2011 RedHat inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#define EXECUTABLE "abrt-action-install-debuginfo"
static void error_msg_and_die(const char *msg, const char *arg)
{
write(2, msg, strlen(msg));
if (arg)
{
write(2, " '", 2);
write(2, arg, strlen(arg));
write(2, "'", 1);
}
write(2, "\n", 1);
exit(1);
}
/* A binary wrapper is needed around python scripts if we want
* to run them in sgid/suid mode.
*
* This is such a wrapper.
*/
int main(int argc, char **argv)
{
/*
* We disallow passing of arguments which point to writable dirs
* and other files possibly not accessible to calling user.
* This way, the script will always use default values for these arguments.
*/
char **pp = argv;
char *arg;
while ((arg = *++pp) != NULL)
{
/* Allow taking ids from stdin */
if (strcmp(arg, "--ids=-") == 0)
continue;
if (strncmp(arg, "--cache", 7) == 0)
error_msg_and_die("bad option", arg);
if (strncmp(arg, "--tmpdir", 8) == 0)
error_msg_and_die("bad option", arg);
if (strncmp(arg, "--ids", 5) == 0)
error_msg_and_die("bad option", arg);
}
/* Switch real user/group to effective ones.
* Otherwise yum library gets confused - gets EPERM (why??).
*/
gid_t g = getegid();
/* do setregid only if we have to, to not upset selinux needlessly */
if (g != getgid())
setregid(g, g);
uid_t u = geteuid();
if (u != getuid())
{
setreuid(u, u);
/* We are suid'ed! */
/* Prevent malicious user from messing up with suid'ed process: */
/* Set safe PATH */
// TODO: honor configure --prefix here by adding it to PATH
// (otherwise abrt-action-install-debuginfo would fail to spawn abrt-action-trim-files):
if (u == 0)
putenv((char*) "PATH=/usr/sbin:/sbin:/usr/bin:/bin");
else
putenv((char*) "PATH=/usr/bin:/bin");
/* Clear dangerous stuff from env */
static const char forbid[] =
"LD_LIBRARY_PATH" "\0"
"LD_PRELOAD" "\0"
"LD_TRACE_LOADED_OBJECTS" "\0"
"LD_BIND_NOW" "\0"
"LD_AOUT_LIBRARY_PATH" "\0"
"LD_AOUT_PRELOAD" "\0"
"LD_NOWARN" "\0"
"LD_KEEPDIR" "\0"
;
const char *p = forbid;
do {
unsetenv(p);
p += strlen(p) + 1;
} while (*p);
}
execvp(EXECUTABLE, argv);
error_msg_and_die("Can't execute", EXECUTABLE);
}
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