netfilter: xt_qtaguid: remove AID_* dependency for access control
qtaguid limits what can be done with /ctrl and /stats based on group membership. This changes removes AID_NET_BW_STATS and AID_NET_BW_ACCT, and picks up the groups from the gid of the matching proc entry files. Signed-off-by: JP Abgrall <jpa@google.com> Change-Id: I42e477adde78a12ed5eb58fbc0b277cdaadb6f94
This commit is contained in:
parent
1ab68f5441
commit
e585d17670
|
@ -53,25 +53,22 @@ static unsigned int proc_stats_perms = S_IRUGO;
|
|||
module_param_named(stats_perms, proc_stats_perms, uint, S_IRUGO | S_IWUSR);
|
||||
|
||||
static struct proc_dir_entry *xt_qtaguid_ctrl_file;
|
||||
#ifdef CONFIG_ANDROID_PARANOID_NETWORK
|
||||
|
||||
/* Everybody can write. But proc_ctrl_write_limited is true by default which
|
||||
* limits what can be controlled. See the can_*() functions.
|
||||
*/
|
||||
static unsigned int proc_ctrl_perms = S_IRUGO | S_IWUGO;
|
||||
#else
|
||||
static unsigned int proc_ctrl_perms = S_IRUGO | S_IWUSR;
|
||||
#endif
|
||||
module_param_named(ctrl_perms, proc_ctrl_perms, uint, S_IRUGO | S_IWUSR);
|
||||
|
||||
#ifdef CONFIG_ANDROID_PARANOID_NETWORK
|
||||
#include <linux/android_aid.h>
|
||||
static gid_t proc_stats_readall_gid = AID_NET_BW_STATS;
|
||||
static gid_t proc_ctrl_write_gid = AID_NET_BW_ACCT;
|
||||
#else
|
||||
/* 0 means, don't limit anybody */
|
||||
static gid_t proc_stats_readall_gid;
|
||||
static gid_t proc_ctrl_write_gid;
|
||||
#endif
|
||||
module_param_named(stats_readall_gid, proc_stats_readall_gid, uint,
|
||||
/* Limited by default, so the gid of the ctrl and stats proc entries
|
||||
* will limit what can be done. See the can_*() functions.
|
||||
*/
|
||||
static bool proc_stats_readall_limited = true;
|
||||
static bool proc_ctrl_write_limited = true;
|
||||
|
||||
module_param_named(stats_readall_limited, proc_stats_readall_limited, bool,
|
||||
S_IRUGO | S_IWUSR);
|
||||
module_param_named(ctrl_write_gid, proc_ctrl_write_gid, uint,
|
||||
module_param_named(ctrl_write_limited, proc_ctrl_write_limited, bool,
|
||||
S_IRUGO | S_IWUSR);
|
||||
|
||||
/*
|
||||
|
@ -242,8 +239,9 @@ static struct qtaguid_event_counts qtu_events;
|
|||
static bool can_manipulate_uids(void)
|
||||
{
|
||||
/* root pwnd */
|
||||
return unlikely(!current_fsuid()) || unlikely(!proc_ctrl_write_gid)
|
||||
|| in_egroup_p(proc_ctrl_write_gid);
|
||||
return in_egroup_p(xt_qtaguid_ctrl_file->gid)
|
||||
|| unlikely(!current_fsuid()) || unlikely(!proc_ctrl_write_limited)
|
||||
|| unlikely(current_fsuid() == xt_qtaguid_ctrl_file->uid);
|
||||
}
|
||||
|
||||
static bool can_impersonate_uid(uid_t uid)
|
||||
|
@ -254,9 +252,10 @@ static bool can_impersonate_uid(uid_t uid)
|
|||
static bool can_read_other_uid_stats(uid_t uid)
|
||||
{
|
||||
/* root pwnd */
|
||||
return unlikely(!current_fsuid()) || uid == current_fsuid()
|
||||
|| unlikely(!proc_stats_readall_gid)
|
||||
|| in_egroup_p(proc_stats_readall_gid);
|
||||
return in_egroup_p(xt_qtaguid_stats_file->gid)
|
||||
|| unlikely(!current_fsuid()) || uid == current_fsuid()
|
||||
|| unlikely(!proc_stats_readall_limited)
|
||||
|| unlikely(current_fsuid() == xt_qtaguid_ctrl_file->uid);
|
||||
}
|
||||
|
||||
static inline void dc_add_byte_packets(struct data_counters *counters, int set,
|
||||
|
@ -2302,11 +2301,12 @@ static int ctrl_cmd_tag(const char *input)
|
|||
}
|
||||
CT_DEBUG("qtaguid: ctrl_tag(%s): "
|
||||
"pid=%u tgid=%u uid=%u euid=%u fsuid=%u "
|
||||
"in_group=%d in_egroup=%d\n",
|
||||
"ctrl.gid=%u in_group()=%d in_egroup()=%d\n",
|
||||
input, current->pid, current->tgid, current_uid(),
|
||||
current_euid(), current_fsuid(),
|
||||
in_group_p(proc_ctrl_write_gid),
|
||||
in_egroup_p(proc_ctrl_write_gid));
|
||||
xt_qtaguid_ctrl_file->gid,
|
||||
in_group_p(xt_qtaguid_ctrl_file->gid),
|
||||
in_egroup_p(xt_qtaguid_ctrl_file->gid));
|
||||
if (argc < 4) {
|
||||
uid = current_fsuid();
|
||||
} else if (!can_impersonate_uid(uid)) {
|
||||
|
@ -2598,10 +2598,11 @@ static int pp_stats_line(struct proc_print_info *ppi, int cnt_set)
|
|||
&& !can_read_other_uid_stats(stat_uid)) {
|
||||
CT_DEBUG("qtaguid: stats line: "
|
||||
"%s 0x%llx %u: insufficient priv "
|
||||
"from pid=%u tgid=%u uid=%u\n",
|
||||
"from pid=%u tgid=%u uid=%u stats.gid=%u\n",
|
||||
ppi->iface_entry->ifname,
|
||||
get_atag_from_tag(tag), stat_uid,
|
||||
current->pid, current->tgid, current_fsuid());
|
||||
current->pid, current->tgid, current_fsuid(),
|
||||
xt_qtaguid_stats_file->gid);
|
||||
return 0;
|
||||
}
|
||||
if (ppi->item_index++ < ppi->items_to_skip)
|
||||
|
|
Loading…
Reference in New Issue