add susfs-dev branch files
This commit is contained in:
樱檩殇雪
483
kernel/selinux/rules.c
Normal file
483
kernel/selinux/rules.c
Normal file
@@ -0,0 +1,483 @@
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/version.h>
|
||||
|
||||
#include "../klog.h" // IWYU pragma: keep
|
||||
#include "selinux.h"
|
||||
#include "sepolicy.h"
|
||||
#include "ss/services.h"
|
||||
#include "linux/lsm_audit.h"
|
||||
#include "xfrm.h"
|
||||
|
||||
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 0)
|
||||
#define SELINUX_POLICY_INSTEAD_SELINUX_SS
|
||||
#endif
|
||||
|
||||
#define KERNEL_SU_DOMAIN "su"
|
||||
#define KERNEL_SU_FILE "ksu_file"
|
||||
#define KERNEL_EXEC_TYPE "ksu_exec"
|
||||
#define ALL NULL
|
||||
|
||||
static struct policydb *get_policydb(void)
|
||||
{
|
||||
struct policydb *db;
|
||||
// selinux_state does not exists before 4.19
|
||||
#ifdef KSU_COMPAT_USE_SELINUX_STATE
|
||||
#ifdef SELINUX_POLICY_INSTEAD_SELINUX_SS
|
||||
struct selinux_policy *policy = rcu_dereference(selinux_state.policy);
|
||||
db = &policy->policydb;
|
||||
#else
|
||||
struct selinux_ss *ss = rcu_dereference(selinux_state.ss);
|
||||
db = &ss->policydb;
|
||||
#endif
|
||||
#else
|
||||
db = &policydb;
|
||||
#endif
|
||||
return db;
|
||||
}
|
||||
|
||||
void ksu_apply_kernelsu_rules()
|
||||
{
|
||||
if (!ksu_getenforce()) {
|
||||
pr_info("SELinux permissive or disabled, apply rules!\n");
|
||||
}
|
||||
|
||||
rcu_read_lock();
|
||||
struct policydb *db = get_policydb();
|
||||
|
||||
ksu_permissive(db, KERNEL_SU_DOMAIN);
|
||||
ksu_typeattribute(db, KERNEL_SU_DOMAIN, "mlstrustedsubject");
|
||||
ksu_typeattribute(db, KERNEL_SU_DOMAIN, "netdomain");
|
||||
ksu_typeattribute(db, KERNEL_SU_DOMAIN, "bluetoothdomain");
|
||||
|
||||
// Create unconstrained file type
|
||||
ksu_type(db, KERNEL_SU_FILE, "file_type");
|
||||
ksu_typeattribute(db, KERNEL_SU_FILE, "mlstrustedobject");
|
||||
ksu_allow(db, ALL, KERNEL_SU_FILE, ALL, ALL);
|
||||
|
||||
// allow all!
|
||||
ksu_allow(db, KERNEL_SU_DOMAIN, ALL, ALL, ALL);
|
||||
|
||||
// allow us do any ioctl
|
||||
if (db->policyvers >= POLICYDB_VERSION_XPERMS_IOCTL) {
|
||||
ksu_allowxperm(db, KERNEL_SU_DOMAIN, ALL, "blk_file", ALL);
|
||||
ksu_allowxperm(db, KERNEL_SU_DOMAIN, ALL, "fifo_file", ALL);
|
||||
ksu_allowxperm(db, KERNEL_SU_DOMAIN, ALL, "chr_file", ALL);
|
||||
ksu_allowxperm(db, KERNEL_SU_DOMAIN, ALL, "file", ALL);
|
||||
}
|
||||
|
||||
// we need to save allowlist in /data/adb/ksu
|
||||
ksu_allow(db, "kernel", "adb_data_file", "dir", ALL);
|
||||
ksu_allow(db, "kernel", "adb_data_file", "file", ALL);
|
||||
// we need to search /data/app
|
||||
ksu_allow(db, "kernel", "apk_data_file", "file", "open");
|
||||
ksu_allow(db, "kernel", "apk_data_file", "dir", "open");
|
||||
ksu_allow(db, "kernel", "apk_data_file", "dir", "read");
|
||||
ksu_allow(db, "kernel", "apk_data_file", "dir", "search");
|
||||
// we may need to do mount on shell
|
||||
ksu_allow(db, "kernel", "shell_data_file", "file", ALL);
|
||||
// we need to read /data/system/packages.list
|
||||
ksu_allow(db, "kernel", "kernel", "capability", "dac_override");
|
||||
// Android 10+:
|
||||
// http://aospxref.com/android-12.0.0_r3/xref/system/sepolicy/private/file_contexts#512
|
||||
ksu_allow(db, "kernel", "packages_list_file", "file", ALL);
|
||||
// Kernel 4.4
|
||||
ksu_allow(db, "kernel", "packages_list_file", "dir", ALL);
|
||||
// Android 9-:
|
||||
// http://aospxref.com/android-9.0.0_r61/xref/system/sepolicy/private/file_contexts#360
|
||||
ksu_allow(db, "kernel", "system_data_file", "file", ALL);
|
||||
ksu_allow(db, "kernel", "system_data_file", "dir", ALL);
|
||||
// our ksud triggered by init
|
||||
ksu_allow(db, "init", "adb_data_file", "file", ALL);
|
||||
ksu_allow(db, "init", "adb_data_file", "dir", ALL); // #1289
|
||||
ksu_allow(db, "init", KERNEL_SU_DOMAIN, ALL, ALL);
|
||||
// we need to umount modules in zygote
|
||||
ksu_allow(db, "zygote", "adb_data_file", "dir", "search");
|
||||
|
||||
// copied from Magisk rules
|
||||
// suRights
|
||||
ksu_allow(db, "servicemanager", KERNEL_SU_DOMAIN, "dir", "search");
|
||||
ksu_allow(db, "servicemanager", KERNEL_SU_DOMAIN, "dir", "read");
|
||||
ksu_allow(db, "servicemanager", KERNEL_SU_DOMAIN, "file", "open");
|
||||
ksu_allow(db, "servicemanager", KERNEL_SU_DOMAIN, "file", "read");
|
||||
ksu_allow(db, "servicemanager", KERNEL_SU_DOMAIN, "process", "getattr");
|
||||
ksu_allow(db, ALL, KERNEL_SU_DOMAIN, "process", "sigchld");
|
||||
|
||||
// allowLog
|
||||
ksu_allow(db, "logd", KERNEL_SU_DOMAIN, "dir", "search");
|
||||
ksu_allow(db, "logd", KERNEL_SU_DOMAIN, "file", "read");
|
||||
ksu_allow(db, "logd", KERNEL_SU_DOMAIN, "file", "open");
|
||||
ksu_allow(db, "logd", KERNEL_SU_DOMAIN, "file", "getattr");
|
||||
|
||||
// dumpsys
|
||||
ksu_allow(db, ALL, KERNEL_SU_DOMAIN, "fd", "use");
|
||||
ksu_allow(db, ALL, KERNEL_SU_DOMAIN, "fifo_file", "write");
|
||||
ksu_allow(db, ALL, KERNEL_SU_DOMAIN, "fifo_file", "read");
|
||||
ksu_allow(db, ALL, KERNEL_SU_DOMAIN, "fifo_file", "open");
|
||||
ksu_allow(db, ALL, KERNEL_SU_DOMAIN, "fifo_file", "getattr");
|
||||
|
||||
// bootctl
|
||||
ksu_allow(db, "hwservicemanager", KERNEL_SU_DOMAIN, "dir", "search");
|
||||
ksu_allow(db, "hwservicemanager", KERNEL_SU_DOMAIN, "file", "read");
|
||||
ksu_allow(db, "hwservicemanager", KERNEL_SU_DOMAIN, "file", "open");
|
||||
ksu_allow(db, "hwservicemanager", KERNEL_SU_DOMAIN, "process",
|
||||
"getattr");
|
||||
|
||||
// For mounting loop devices, mirrors, tmpfs
|
||||
ksu_allow(db, "kernel", ALL, "file", "read");
|
||||
ksu_allow(db, "kernel", ALL, "file", "write");
|
||||
|
||||
// Allow all binder transactions
|
||||
ksu_allow(db, ALL, KERNEL_SU_DOMAIN, "binder", ALL);
|
||||
|
||||
// Allow system server kill su process
|
||||
ksu_allow(db, "system_server", KERNEL_SU_DOMAIN, "process", "getpgid");
|
||||
ksu_allow(db, "system_server", KERNEL_SU_DOMAIN, "process", "sigkill");
|
||||
|
||||
#ifdef CONFIG_KSU_SUSFS
|
||||
// Allow umount in zygote process without installing zygisk
|
||||
ksu_allow(db, "zygote", "labeledfs", "filesystem", "unmount");
|
||||
susfs_set_init_sid();
|
||||
susfs_set_ksu_sid();
|
||||
susfs_set_zygote_sid();
|
||||
#endif
|
||||
|
||||
rcu_read_unlock();
|
||||
}
|
||||
|
||||
#define MAX_SEPOL_LEN 128
|
||||
|
||||
#define CMD_NORMAL_PERM 1
|
||||
#define CMD_XPERM 2
|
||||
#define CMD_TYPE_STATE 3
|
||||
#define CMD_TYPE 4
|
||||
#define CMD_TYPE_ATTR 5
|
||||
#define CMD_ATTR 6
|
||||
#define CMD_TYPE_TRANSITION 7
|
||||
#define CMD_TYPE_CHANGE 8
|
||||
#define CMD_GENFSCON 9
|
||||
|
||||
struct sepol_data {
|
||||
u32 cmd;
|
||||
u32 subcmd;
|
||||
char __user *sepol1;
|
||||
char __user *sepol2;
|
||||
char __user *sepol3;
|
||||
char __user *sepol4;
|
||||
char __user *sepol5;
|
||||
char __user *sepol6;
|
||||
char __user *sepol7;
|
||||
};
|
||||
|
||||
static int get_object(char *buf, char __user *user_object, size_t buf_sz,
|
||||
char **object)
|
||||
{
|
||||
if (!user_object) {
|
||||
*object = ALL;
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (strncpy_from_user(buf, user_object, buf_sz) < 0) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
*object = buf;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
// reset avc cache table, otherwise the new rules will not take effect if already denied
|
||||
static void reset_avc_cache()
|
||||
{
|
||||
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 4, 0) || !defined(KSU_COMPAT_USE_SELINUX_STATE)
|
||||
avc_ss_reset(0);
|
||||
selnl_notify_policyload(0);
|
||||
selinux_status_update_policyload(0);
|
||||
#else
|
||||
struct selinux_avc *avc = selinux_state.avc;
|
||||
avc_ss_reset(avc, 0);
|
||||
selnl_notify_policyload(0);
|
||||
selinux_status_update_policyload(&selinux_state, 0);
|
||||
#endif
|
||||
selinux_xfrm_notify_policyload();
|
||||
}
|
||||
|
||||
int ksu_handle_sepolicy(unsigned long arg3, void __user *arg4)
|
||||
{
|
||||
if (!arg4) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (!ksu_getenforce()) {
|
||||
pr_info("SELinux permissive or disabled when handle policy!\n");
|
||||
}
|
||||
|
||||
struct sepol_data data;
|
||||
if (copy_from_user(&data, arg4, sizeof(struct sepol_data))) {
|
||||
pr_err("sepol: copy sepol_data failed.\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
u32 cmd = data.cmd;
|
||||
u32 subcmd = data.subcmd;
|
||||
|
||||
rcu_read_lock();
|
||||
|
||||
struct policydb *db = get_policydb();
|
||||
|
||||
int ret = -1;
|
||||
if (cmd == CMD_NORMAL_PERM) {
|
||||
char src_buf[MAX_SEPOL_LEN];
|
||||
char tgt_buf[MAX_SEPOL_LEN];
|
||||
char cls_buf[MAX_SEPOL_LEN];
|
||||
char perm_buf[MAX_SEPOL_LEN];
|
||||
|
||||
char *s, *t, *c, *p;
|
||||
if (get_object(src_buf, data.sepol1, sizeof(src_buf), &s) < 0) {
|
||||
pr_err("sepol: copy src failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
|
||||
if (get_object(tgt_buf, data.sepol2, sizeof(tgt_buf), &t) < 0) {
|
||||
pr_err("sepol: copy tgt failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
|
||||
if (get_object(cls_buf, data.sepol3, sizeof(cls_buf), &c) < 0) {
|
||||
pr_err("sepol: copy cls failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
|
||||
if (get_object(perm_buf, data.sepol4, sizeof(perm_buf), &p) <
|
||||
0) {
|
||||
pr_err("sepol: copy perm failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
|
||||
bool success = false;
|
||||
if (subcmd == 1) {
|
||||
success = ksu_allow(db, s, t, c, p);
|
||||
} else if (subcmd == 2) {
|
||||
success = ksu_deny(db, s, t, c, p);
|
||||
} else if (subcmd == 3) {
|
||||
success = ksu_auditallow(db, s, t, c, p);
|
||||
} else if (subcmd == 4) {
|
||||
success = ksu_dontaudit(db, s, t, c, p);
|
||||
} else {
|
||||
pr_err("sepol: unknown subcmd: %d\n", subcmd);
|
||||
}
|
||||
ret = success ? 0 : -1;
|
||||
|
||||
} else if (cmd == CMD_XPERM) {
|
||||
char src_buf[MAX_SEPOL_LEN];
|
||||
char tgt_buf[MAX_SEPOL_LEN];
|
||||
char cls_buf[MAX_SEPOL_LEN];
|
||||
|
||||
char __maybe_unused
|
||||
operation[MAX_SEPOL_LEN]; // it is always ioctl now!
|
||||
char perm_set[MAX_SEPOL_LEN];
|
||||
|
||||
char *s, *t, *c;
|
||||
if (get_object(src_buf, data.sepol1, sizeof(src_buf), &s) < 0) {
|
||||
pr_err("sepol: copy src failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
if (get_object(tgt_buf, data.sepol2, sizeof(tgt_buf), &t) < 0) {
|
||||
pr_err("sepol: copy tgt failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
if (get_object(cls_buf, data.sepol3, sizeof(cls_buf), &c) < 0) {
|
||||
pr_err("sepol: copy cls failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
if (strncpy_from_user(operation, data.sepol4,
|
||||
sizeof(operation)) < 0) {
|
||||
pr_err("sepol: copy operation failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
if (strncpy_from_user(perm_set, data.sepol5, sizeof(perm_set)) <
|
||||
0) {
|
||||
pr_err("sepol: copy perm_set failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
|
||||
bool success = false;
|
||||
if (subcmd == 1) {
|
||||
success = ksu_allowxperm(db, s, t, c, perm_set);
|
||||
} else if (subcmd == 2) {
|
||||
success = ksu_auditallowxperm(db, s, t, c, perm_set);
|
||||
} else if (subcmd == 3) {
|
||||
success = ksu_dontauditxperm(db, s, t, c, perm_set);
|
||||
} else {
|
||||
pr_err("sepol: unknown subcmd: %d\n", subcmd);
|
||||
}
|
||||
ret = success ? 0 : -1;
|
||||
} else if (cmd == CMD_TYPE_STATE) {
|
||||
char src[MAX_SEPOL_LEN];
|
||||
|
||||
if (strncpy_from_user(src, data.sepol1, sizeof(src)) < 0) {
|
||||
pr_err("sepol: copy src failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
|
||||
bool success = false;
|
||||
if (subcmd == 1) {
|
||||
success = ksu_permissive(db, src);
|
||||
} else if (subcmd == 2) {
|
||||
success = ksu_enforce(db, src);
|
||||
} else {
|
||||
pr_err("sepol: unknown subcmd: %d\n", subcmd);
|
||||
}
|
||||
if (success)
|
||||
ret = 0;
|
||||
|
||||
} else if (cmd == CMD_TYPE || cmd == CMD_TYPE_ATTR) {
|
||||
char type[MAX_SEPOL_LEN];
|
||||
char attr[MAX_SEPOL_LEN];
|
||||
|
||||
if (strncpy_from_user(type, data.sepol1, sizeof(type)) < 0) {
|
||||
pr_err("sepol: copy type failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
if (strncpy_from_user(attr, data.sepol2, sizeof(attr)) < 0) {
|
||||
pr_err("sepol: copy attr failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
|
||||
bool success = false;
|
||||
if (cmd == CMD_TYPE) {
|
||||
success = ksu_type(db, type, attr);
|
||||
} else {
|
||||
success = ksu_typeattribute(db, type, attr);
|
||||
}
|
||||
if (!success) {
|
||||
pr_err("sepol: %d failed.\n", cmd);
|
||||
goto exit;
|
||||
}
|
||||
ret = 0;
|
||||
|
||||
} else if (cmd == CMD_ATTR) {
|
||||
char attr[MAX_SEPOL_LEN];
|
||||
|
||||
if (strncpy_from_user(attr, data.sepol1, sizeof(attr)) < 0) {
|
||||
pr_err("sepol: copy attr failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
if (!ksu_attribute(db, attr)) {
|
||||
pr_err("sepol: %d failed.\n", cmd);
|
||||
goto exit;
|
||||
}
|
||||
ret = 0;
|
||||
|
||||
} else if (cmd == CMD_TYPE_TRANSITION) {
|
||||
char src[MAX_SEPOL_LEN];
|
||||
char tgt[MAX_SEPOL_LEN];
|
||||
char cls[MAX_SEPOL_LEN];
|
||||
char default_type[MAX_SEPOL_LEN];
|
||||
char object[MAX_SEPOL_LEN];
|
||||
|
||||
if (strncpy_from_user(src, data.sepol1, sizeof(src)) < 0) {
|
||||
pr_err("sepol: copy src failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
if (strncpy_from_user(tgt, data.sepol2, sizeof(tgt)) < 0) {
|
||||
pr_err("sepol: copy tgt failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
if (strncpy_from_user(cls, data.sepol3, sizeof(cls)) < 0) {
|
||||
pr_err("sepol: copy cls failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
if (strncpy_from_user(default_type, data.sepol4,
|
||||
sizeof(default_type)) < 0) {
|
||||
pr_err("sepol: copy default_type failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
char *real_object;
|
||||
if (data.sepol5 == NULL) {
|
||||
real_object = NULL;
|
||||
} else {
|
||||
if (strncpy_from_user(object, data.sepol5,
|
||||
sizeof(object)) < 0) {
|
||||
pr_err("sepol: copy object failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
real_object = object;
|
||||
}
|
||||
|
||||
bool success = ksu_type_transition(db, src, tgt, cls,
|
||||
default_type, real_object);
|
||||
if (success)
|
||||
ret = 0;
|
||||
|
||||
} else if (cmd == CMD_TYPE_CHANGE) {
|
||||
char src[MAX_SEPOL_LEN];
|
||||
char tgt[MAX_SEPOL_LEN];
|
||||
char cls[MAX_SEPOL_LEN];
|
||||
char default_type[MAX_SEPOL_LEN];
|
||||
|
||||
if (strncpy_from_user(src, data.sepol1, sizeof(src)) < 0) {
|
||||
pr_err("sepol: copy src failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
if (strncpy_from_user(tgt, data.sepol2, sizeof(tgt)) < 0) {
|
||||
pr_err("sepol: copy tgt failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
if (strncpy_from_user(cls, data.sepol3, sizeof(cls)) < 0) {
|
||||
pr_err("sepol: copy cls failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
if (strncpy_from_user(default_type, data.sepol4,
|
||||
sizeof(default_type)) < 0) {
|
||||
pr_err("sepol: copy default_type failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
bool success = false;
|
||||
if (subcmd == 1) {
|
||||
success = ksu_type_change(db, src, tgt, cls,
|
||||
default_type);
|
||||
} else if (subcmd == 2) {
|
||||
success = ksu_type_member(db, src, tgt, cls,
|
||||
default_type);
|
||||
} else {
|
||||
pr_err("sepol: unknown subcmd: %d\n", subcmd);
|
||||
}
|
||||
if (success)
|
||||
ret = 0;
|
||||
} else if (cmd == CMD_GENFSCON) {
|
||||
char name[MAX_SEPOL_LEN];
|
||||
char path[MAX_SEPOL_LEN];
|
||||
char context[MAX_SEPOL_LEN];
|
||||
if (strncpy_from_user(name, data.sepol1, sizeof(name)) < 0) {
|
||||
pr_err("sepol: copy name failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
if (strncpy_from_user(path, data.sepol2, sizeof(path)) < 0) {
|
||||
pr_err("sepol: copy path failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
if (strncpy_from_user(context, data.sepol3, sizeof(context)) <
|
||||
0) {
|
||||
pr_err("sepol: copy context failed.\n");
|
||||
goto exit;
|
||||
}
|
||||
|
||||
if (!ksu_genfscon(db, name, path, context)) {
|
||||
pr_err("sepol: %d failed.\n", cmd);
|
||||
goto exit;
|
||||
}
|
||||
ret = 0;
|
||||
} else {
|
||||
pr_err("sepol: unknown cmd: %d\n", cmd);
|
||||
}
|
||||
|
||||
exit:
|
||||
rcu_read_unlock();
|
||||
|
||||
// only allow and xallow needs to reset avc cache, but we cannot do that because
|
||||
// we are in atomic context. so we just reset it every time.
|
||||
reset_avc_cache();
|
||||
|
||||
return ret;
|
||||
}
|
||||
Reference in New Issue
Block a user