Jerry/D-Modem
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mm.py
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@ -277,18 +277,32 @@ class Modem:
pw_record = pwd.getpwnam(RUN_AS) pw_record = pwd.getpwnam(RUN_AS)
uid, gid = pw_record.pw_uid, pw_record.pw_gid uid, gid = pw_record.pw_uid, pw_record.pw_gid
def demote(): def demote():
PR_SET_NO_NEW_PRIVS = 38 PR_SET_NO_NEW_PRIVS = 38
PR_CAP_AMBIENT = 47 PR_CAP_AMBIENT = 47
PR_CAP_AMBIENT_CLEAR_ALL = 4 PR_CAP_AMBIENT_CLEAR_ALL = 4
PR_GET_SECUREBITS = 27 PR_GET_SECUREBITS = 27
PR_SET_SECUREBITS = 28 PR_SET_SECUREBITS = 28
libc = ctypes.CDLL('libc.so.6') libc = ctypes.CDLL('/usr/lib/libc.so.6')
libc.prctl.restype = ctypes.c_int assert libc.prctl(
assert libc.prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) == 0 ctypes.c_int(PR_SET_NO_NEW_PRIVS),
assert libc.prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_CLEAR_ALL, 0, 0, 0) == 0 ctypes.c_int(1),
assert libc.prctl(PR_SET_SECUREBITS, 0x2f) == 0 ctypes.c_int(0),
# SECBIT_KEEP_CAPS_LOCKED | SECBIT_NO_SETUID_FIXUP | SECBIT_NO_SETUID_FIXUP_LOCKED | SECBIT_NOROOT | SECBIT_NOROOT_LOCKED ctypes.c_int(0),
assert libc.prctl(PR_GET_SECUREBITS) == 0x2f ctypes.c_int(0)
) == 0
assert libc.prctl(
ctypes.c_int(PR_CAP_AMBIENT),
ctypes.c_int(PR_CAP_AMBIENT_CLEAR_ALL),
ctypes.c_int(0),
ctypes.c_int(0),
ctypes.c_int(0)
) == 0
libc.prctl(
PR_SET_SECUREBITS,
ctypes.c_int(0x2f) # SECBIT_KEEP_CAPS_LOCKED | SECBIT_NO_SETUID_FIXUP | SECBIT_NO_SETUID_FIXUP_LOCKED | SECBIT_NOROOT | SECBIT_NOROOT_LOCKED
)
assert libc.prctl(ctypes.c_int(PR_GET_SECUREBITS)) == 0x2f
os.setgroups([]) os.setgroups([])
os.setresgid(gid, gid, gid) os.setresgid(gid, gid, gid)
os.setresuid(uid, uid, uid) os.setresuid(uid, uid, uid)