static int dek_encrypt_dek(int userid, dek_t *plainDek, dek_t *encDek) {
int ret = 0;
int key_arr_idx = PERSONA_KEY_ARR_IDX(userid);
if (!dek_is_persona(userid)) {
DEK_LOGE("%s invalid userid %d\n", __func__, userid);
return -EFAULT;
}
#if DEK_DEBUG
DEK_LOGD("plainDek from user: "******"aes encrypt failed\n");
dek_add_to_log(userid, "aes encrypt failed");
encDek->len = 0;
} else {
encDek->len = plainDek->len;
encDek->type = DEK_TYPE_AES_ENC;
}
} else {
#ifdef CONFIG_PUB_CRYPTO
/*
* Do an asymmetric crypto
*/
if(SDPK_Dpub[key_arr_idx].len > 0) {
ret = dh_encryptDEK(plainDek, encDek, &SDPK_Dpub[key_arr_idx]);
}else{
DEK_LOGE("SDPK_Dpub for id: %d\n", userid);
dek_add_to_log(userid, "encrypt failed, no SDPK_Dpub");
return -EIO;
}
#else
DEK_LOGE("pub crypto not supported : %d\n", userid);
dek_add_to_log(userid, "encrypt failed, no key");
return -EOPNOTSUPP;
#endif
}
if (encDek->len <= 0 || encDek->len > DEK_MAXLEN) {
DEK_LOGE("dek_encrypt_dek, incorrect len=%d\n", encDek->len);
zero_out((char *)encDek, sizeof(dek_t));
return -EFAULT;
}
#if DEK_DEBUG
else {
DEK_LOGD("encDek to user: ");
dump(encDek->buf, encDek->len);
}
#endif
return ret;
}
static int ecryptfs_release(struct inode *inode, struct file *file)
{
#ifdef CONFIG_SDP
struct ecryptfs_crypt_stat *crypt_stat;
crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
if(crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE) {
#if 0
#ifdef SYNC_ONLY_CURRENT_SB
struct super_block *sb = inode->i_sb;
sync_inodes_sb(sb);
writeback_inodes_sb(sb, WB_REASON_SYNC);
#else
sys_sync();
#endif
DEK_LOGD("%s() sensitive inode being closed. [ino:%lu, state:%lu ref_count:%d efs_flag:0x%0.8x]\n",
__func__, inode->i_ino, inode->i_state, atomic_read(&inode->i_count),
crypt_stat->flags);
spin_lock(&inode->i_lock);
if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
(inode->i_mapping->nrpages == 0)) {
spin_unlock(&inode->i_lock);
} else {
printk("freeing sensitive inode\n");
invalidate_mapping_pages(inode->i_mapping, 0, -1);
}
spin_unlock(&inode->i_lock);
#else
DEK_LOGD("%s() sensitive inode being closed. [ino:%lu, state:%lu ref_count:%d]\n",
__func__, inode->i_ino, inode->i_state, atomic_read(&inode->i_count));
ecryptfs_clean_sdp_dek(crypt_stat);
if(ecryptfs_is_persona_locked(crypt_stat->userid))
ecryptfs_mm_drop_cache(crypt_stat->userid);
}
#endif
#endif
ecryptfs_put_lower_file(inode);
kmem_cache_free(ecryptfs_file_info_cache,
ecryptfs_file_to_private(file));
return 0;
}
int ecryptfs_get_sdp_dek(unsigned char *sig, int *sig_len, struct ecryptfs_crypt_stat *crypt_stat)
{
int rc = 0;
if(crypt_stat != NULL && (crypt_stat->flags & ECRYPTFS_DEK_SDP_ENABLED)) {
if((crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE)) {
dek_t DEK;
#if ECRYPTFS_DEK_DEBUG
DEK_LOGD("get_sdp_dek: sensitive, dek type: %d\n", crypt_stat->sdp_dek.type);
ecryptfs_dumpkey(crypt_stat->userid, "sdp_dek:", crypt_stat->sdp_dek.buf, crypt_stat->sdp_dek.len);
#endif
if (crypt_stat->sdp_dek.type != DEK_TYPE_PLAIN) {
rc = dek_decrypt_dek_efs(crypt_stat->userid, &crypt_stat->sdp_dek, &DEK);
} else {
DEK_LOGE("Error, DEK already plaintext");
rc = -1;
}
if (rc < 0) {
DEK_LOGE("Error decypting dek; rc = [%d]\n", rc);
rc = -1;
/*
* TODO : olic.moon
* When we return -1 here, ECRYPTFS_ENCRYPTED is somehow gone
* later. then it occurs error while updating EDEK
*/
rc = 0;
memset(&DEK, 0, sizeof(dek_t));
goto out;
}
#if ECRYPTFS_DEK_DEBUG
ecryptfs_dumpkey(crypt_stat->userid, "decrypted:", DEK.buf, DEK.len);
DEK_LOGD("decrypted key size is %d\n", DEK.len);
#endif
memcpy(sig, DEK.buf, DEK.len);
(*sig_len) = DEK.len;
memset(&DEK, 0, sizeof(dek_t));
} else {
#if ECRYPTFS_DEK_DEBUG
DEK_LOGD("file is not sensitive\n");
#endif
}
}
out:
if(!rc)
sdp_mm_set_process_sensitive(current->pid);
return rc;
}
static ssize_t dek_read_log(struct file *file, char __user *buffer, size_t len, loff_t *off)
{
int ret = 0;
struct log_struct *tmp = NULL;
char log_buf[256];
int log_buf_len;
// build error
//DEK_LOGD("dek_read_log, len=%d, off=%ld, log_count=%d\n",
// len, (long int)*off, log_count);
if (list_empty(&log_buffer.list)) {
DEK_LOGD("process %i (%s) going to sleep\n",
current->pid, current->comm);
flag = 0;
wait_event_interruptible(wq, flag != 0);
}
flag = 0;
spin_lock(&log_buffer.list_lock);
if (!list_empty(&log_buffer.list)) {
tmp = list_first_entry(&log_buffer.list, struct log_struct, list);
if (tmp != NULL) {
memcpy(&log_buf, tmp->buf, tmp->len);
log_buf_len = tmp->len;
list_del(&tmp->list);
kfree(tmp);
log_count--;
spin_unlock(&log_buffer.list_lock);
ret = copy_to_user(buffer, log_buf, log_buf_len);
if (ret) {
DEK_LOGE("dek_read_log, copy_to_user fail, ret=%d, len=%d\n",
ret, log_buf_len);
return -EFAULT;
}
len = log_buf_len;
*off = log_buf_len;
} else {
DEK_LOGD("dek_read_log, tmp == null\n");
len = 0;
spin_unlock(&log_buffer.list_lock);
}
} else {
int ecryptfs_super_block_get_userid(struct super_block *sb)
{
int userid = ecryptfs_superblock_to_private(sb)->userid;
#if ECRYPTFS_DEK_DEBUG
DEK_LOGD("sdp id is %d\n", userid);
#endif
return userid;
}
static int is_system_server(void) {
uid_t uid = current_uid();
switch(uid) {
#if 0
case 0: //root
DEK_LOGD("allowing root to access SDP device files\n");
#endif
case 1000:
return 1;
default:
break;
}
return 0;
}
static void ecryptfs_dumpkey(int userid, char *tag, unsigned char *buf, int len)
{
int i;
char s[512];
s[0] = 0;
for(i=0;i<len && i<16;++i) {
char tmp[8];
sprintf(tmp, " %02x", buf[i]);
strcat(s, tmp);
}
if (len > 16) {
char tmp[8];
sprintf(tmp, " ...");
strcat(s, tmp);
}
DEK_LOGD("id:%d, %s [%s len=%d]\n", userid, tag, s, len);
}
int dek_generate_dek(int userid, dek_t *newDek) {
if (!dek_is_persona(userid)) {
DEK_LOGE("%s invalid userid %d\n", __func__, userid);
return -EFAULT;
}
newDek->len = DEK_LEN;
get_random_bytes(newDek->buf, newDek->len);
if (newDek->len <= 0 || newDek->len > DEK_LEN) {
zero_out((char *)newDek, sizeof(dek_t));
return -EFAULT;
}
#if DEK_DEBUG
else {
DEK_LOGD("DEK: ");
dek_dump(newDek->buf, newDek->len);
}
#endif
return 0;
}
int parse_dek_packet(char *data,
struct ecryptfs_crypt_stat *crypt_stat,
size_t *packet_size) {
int rc = 0;
char temp_comm[PKG_NAME_SIZE]; //test
int temp_euid;
(*packet_size) = 0;
if (data[(*packet_size)++] != ECRYPTFS_DEK_PACKET_TYPE) {
DEK_LOGE("First byte != 0x%.2x; invalid packet\n",
ECRYPTFS_DEK_PACKET_TYPE);
rc = -EINVAL;
}
memcpy(temp_comm, &data[*packet_size], PKG_NAME_SIZE);
(*packet_size) += PKG_NAME_SIZE;
temp_euid = get_unaligned_be32(data + *packet_size);
(*packet_size) += 4;
if (crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE) {
crypt_stat->sdp_dek.type = get_unaligned_be32(data + *packet_size);
(*packet_size) += 4;
crypt_stat->sdp_dek.len = get_unaligned_be32(data + *packet_size);
(*packet_size) += 4;
memcpy(crypt_stat->sdp_dek.buf, &data[*packet_size], crypt_stat->sdp_dek.len);
(*packet_size) += crypt_stat->sdp_dek.len;
}
#if ECRYPTFS_DEK_DEBUG
DEK_LOGD("%s() : comm : %s [euid:%d]\n",
__func__, temp_comm, temp_euid);
#endif
return rc;
}
static long dek_do_ioctl_evt(unsigned int minor, unsigned int cmd,
unsigned long arg) {
long ret = 0;
void __user *ubuf = (void __user *)arg;
void *cleanup = NULL;
unsigned int size;
switch (cmd) {
/*
* Event while booting.
*
* This event comes per persona, the driver is responsible to
* verify things good whether it's compromised.
*/
case DEK_ON_BOOT: {
dek_arg_on_boot *evt = kzalloc(sizeof(dek_arg_on_boot), GFP_KERNEL);
DEK_LOGD("DEK_ON_BOOT\n");
if (evt == NULL) {
ret = -ENOMEM;
goto err;
}
cleanup = evt;
size = sizeof(dek_arg_on_boot);
if(copy_from_user(evt, ubuf, size)) {
DEK_LOGE("can't copy from user evt\n");
ret = -EFAULT;
goto err;
}
ret = dek_on_boot(evt);
if (ret < 0) {
dek_add_to_log(evt->userid, "Boot failed");
goto err;
}
dek_add_to_log(evt->userid, "Booted");
break;
}
/*
* Event when device is locked.
*
* Nullify private key which prevents decryption.
*/
case DEK_ON_DEVICE_LOCKED: {
dek_arg_on_device_locked *evt = kzalloc(sizeof(dek_arg_on_device_locked), GFP_KERNEL);
DEK_LOGD("DEK_ON_DEVICE_LOCKED\n");
if (evt == NULL) {
ret = -ENOMEM;
goto err;
}
cleanup = evt;
size = sizeof(dek_arg_on_device_locked);
if(copy_from_user(evt, ubuf, size)) {
DEK_LOGE("can't copy from user evt\n");
ret = -EFAULT;
goto err;
}
ret = dek_on_device_locked(evt);
if (ret < 0) {
dek_add_to_log(evt->userid, "Lock failed");
goto err;
}
dek_add_to_log(evt->userid, "Locked");
break;
}
/*
* Event when device unlocked.
*
* Read private key and decrypt with user password.
*/
case DEK_ON_DEVICE_UNLOCKED: {
dek_arg_on_device_unlocked *evt = kzalloc(sizeof(dek_arg_on_device_unlocked), GFP_KERNEL);
DEK_LOGD("DEK_ON_DEVICE_UNLOCKED\n");
if (evt == NULL) {
ret = -ENOMEM;
goto err;
}
cleanup = evt;
size = sizeof(dek_arg_on_device_unlocked);
if(copy_from_user(evt, ubuf, size)) {
DEK_LOGE("can't copy from user evt\n");
ret = -EFAULT;
goto err;
}
ret = dek_on_device_unlocked(evt);
if (ret < 0) {
dek_add_to_log(evt->userid, "Unlock failed");
goto err;
}
dek_add_to_log(evt->userid, "Unlocked");
break;
}
/*
* Event when new user(persona) added.
*
* Generate RSA public key and encrypt private key with given
* password. Also pub-key and encryped priv-key have to be stored
* in a file system.
*/
case DEK_ON_USER_ADDED: {
dek_arg_on_user_added *evt = kzalloc(sizeof(dek_arg_on_user_added), GFP_KERNEL);
DEK_LOGD("DEK_ON_USER_ADDED\n");
if (evt == NULL) {
ret = -ENOMEM;
goto err;
}
cleanup = evt;
size = sizeof(dek_arg_on_user_added);
if(copy_from_user(evt, ubuf, size)) {
DEK_LOGE("can't copy from user evt\n");
ret = -EFAULT;
goto err;
}
ret = dek_on_user_added(evt);
if (ret < 0) {
dek_add_to_log(evt->userid, "Add user failed");
goto err;
}
dek_add_to_log(evt->userid, "Added user");
break;
}
/*
* Event when user is removed.
*
* Remove pub-key file & encrypted priv-key file.
*/
case DEK_ON_USER_REMOVED: {
dek_arg_on_user_removed *evt = kzalloc(sizeof(dek_arg_on_user_removed), GFP_KERNEL);
DEK_LOGD("DEK_ON_USER_REMOVED\n");
if (evt == NULL) {
ret = -ENOMEM;
goto err;
}
cleanup = evt;
size = sizeof(dek_arg_on_user_removed);
if(copy_from_user(evt, ubuf, size)) {
DEK_LOGE("can't copy from user evt\n");
ret = -EFAULT;
goto err;
}
ret = dek_on_user_removed(evt);
if (ret < 0) {
dek_add_to_log(evt->userid, "Remove user failed");
goto err;
}
dek_add_to_log(evt->userid, "Removed user");
break;
}
/*
* Event when password changed.
*
* Encrypt SDPK_Rpri with new password and store it.
*/
case DEK_ON_CHANGE_PASSWORD: {
DEK_LOGD("DEK_ON_CHANGE_PASSWORD << deprecated. SKIP\n");
ret = 0;
dek_add_to_log(0, "Changed password << deprecated");
break;
}
case DEK_DISK_CACHE_CLEANUP: {
dek_arg_disk_cache_cleanup *evt = kzalloc(sizeof(dek_arg_disk_cache_cleanup), GFP_KERNEL);
DEK_LOGD("DEK_DISK_CACHE_CLEANUP\n");
if (evt == NULL) {
ret = -ENOMEM;
goto err;
}
cleanup = evt;
size = sizeof(dek_arg_on_user_removed);
if(copy_from_user(evt, ubuf, size)) {
DEK_LOGE("can't copy from user evt\n");
ret = -EFAULT;
goto err;
}
if (!dek_is_persona(evt->userid)) {
DEK_LOGE("%s invalid userid %d\n", __func__, evt->userid);
ret = -EFAULT;
goto err;
}
ecryptfs_mm_drop_cache(evt->userid);
ret = 0;
dek_add_to_log(evt->userid, "Disk cache clean up");
break;
}
default:
DEK_LOGE("%s case default\n", __func__);
ret = -EINVAL;
break;
}
err:
if (cleanup) {
zero_out((char *)cleanup, size);
kfree(cleanup);
}
return ret;
}
static int dek_decrypt_dek(int userid, dek_t *encDek, dek_t *plainDek) {
int key_arr_idx;
int dek_type = encDek->type;
if (!dek_is_persona(userid)) {
DEK_LOGE("%s invalid userid %d\n", __func__, userid);
return -EFAULT;
}
key_arr_idx = PERSONA_KEY_ARR_IDX(userid);
#if DEK_DEBUG
DEK_LOGD("encDek from user: "******"aes decrypt failed\n");
dek_add_to_log(userid, "aes decrypt failed");
plainDek->len = 0;
} else {
plainDek->len = encDek->len;
plainDek->type = DEK_TYPE_PLAIN;
}
} else {
DEK_LOGE("no SDPK_sym key for id: %d\n", userid);
dek_add_to_log(userid, "decrypt failed, persona locked");
return -EIO;
}
return 0;
}
case DEK_TYPE_RSA_ENC:
{
#ifdef CONFIG_PUB_CRYPTO
if(SDPK_Rpri[key_arr_idx].len > 0) {
if(rsa_decryptByPair(encDek, plainDek, &SDPK_Rpri[key_arr_idx])){
DEK_LOGE("rsa_decryptByPair failed");
return -1;
}
}else{
DEK_LOGE("SDPK_Rpri for id: %d\n", userid);
dek_add_to_log(userid, "encrypt failed, no SDPK_Rpri");
return -EIO;
}
#else
DEK_LOGE("Not supported key type: %d\n", encDek->type);
dek_add_to_log(userid, "decrypt failed, DH type not supported");
return -EOPNOTSUPP;
#endif
return 0;
}
case DEK_TYPE_DH_ENC:
{
#ifdef CONFIG_PUB_CRYPTO
if(SDPK_Dpri[key_arr_idx].len > 0) {
if(dh_decryptEDEK(encDek, plainDek, &SDPK_Dpri[key_arr_idx])){
DEK_LOGE("dh_decryptEDEK failed");
return -1;
}
}else{
DEK_LOGE("SDPK_Dpri for id: %d\n", userid);
dek_add_to_log(userid, "encrypt failed, no SDPK_Dpri");
return -EIO;
}
#else
DEK_LOGE("Not supported key type: %d\n", encDek->type);
dek_add_to_log(userid, "decrypt failed, DH type not supported");
return -EOPNOTSUPP;
#endif
return 0;
}
case DEK_TYPE_ECDH256_ENC:
{
#ifdef CONFIG_PUB_CRYPTO
#if DEK_DEBUG
printk("DEK_TYPE_ECDH256_ENC encDek:"); dek_dump(encDek->buf, encDek->len);
#endif
if(SDPK_EDpri[key_arr_idx].len > 0) {
if(ecdh_decryptEDEK(encDek, plainDek, &SDPK_EDpri[key_arr_idx])){
DEK_LOGE("ecdh_decryptEDEK failed");
return -1;
}
}else{
DEK_LOGE("SDPK_EDpri for id: %d\n", userid);
dek_add_to_log(userid, "encrypt failed, no SDPK_EDpri");
return -EIO;
}
#else
DEK_LOGE("Not supported key type: %d\n", encDek->type);
dek_add_to_log(userid, "decrypt failed, ECDH type not supported");
return -EOPNOTSUPP;
#endif
return 0;
}
default:
{
DEK_LOGE("Unsupported edek type: %d\n", encDek->type);
dek_add_to_log(userid, "decrypt failed, unsupported key type");
return -EFAULT;
}
}
}
static int dek_release_log(struct inode *ignored, struct file *file)
{
DEK_LOGD("dek_release_log\n");
return 0;
}
static int dek_open_log(struct inode *inode, struct file *file)
{
DEK_LOGD("dek_open_log\n");
return 0;
}
static int dek_decrypt_dek(int userid, dek_t *encDek, dek_t *plainDek) {
int key_arr_idx = PERSONA_KEY_ARR_IDX(userid);
if (!dek_is_persona(userid)) {
DEK_LOGE("%s invalid userid %d\n", __func__, userid);
return -EFAULT;
}
#if DEK_DEBUG
DEK_LOGD("encDek from user: "******"aes decrypt failed\n");
dek_add_to_log(userid, "aes decrypt failed");
plainDek->len = 0;
} else {
plainDek->len = encDek->len;
plainDek->type = DEK_TYPE_PLAIN;
}
} else {
DEK_LOGE("no SDPK_sym key for id: %d\n", userid);
dek_add_to_log(userid, "decrypt failed, persona locked");
return -EIO;
}
} else if (encDek->type == DEK_TYPE_RSA_ENC) {
DEK_LOGE("Not supported key type: %d\n", encDek->type);
dek_add_to_log(userid, "decrypt failed, RSA type not supported");
return -EFAULT;
} else if (encDek->type == DEK_TYPE_DH_ENC) {
#ifdef CONFIG_PUB_CRYPTO
if(SDPK_Dpri[key_arr_idx].len > 0) {
if(dh_decryptEDEK(encDek, plainDek, &SDPK_Dpri[key_arr_idx])){
DEK_LOGE("dh_decryptEDEK failed");
return -1;
}
}else{
DEK_LOGE("SDPK_Dpri for id: %d\n", userid);
dek_add_to_log(userid, "encrypt failed, no SDPK_Dpri");
return -EIO;
}
#else
DEK_LOGE("Not supported key type: %d\n", encDek->type);
dek_add_to_log(userid, "decrypt failed, DH type not supported");
return -EOPNOTSUPP;
#endif
} else {
DEK_LOGE("Unsupported decrypt key type: %d\n", encDek->type);
dek_add_to_log(userid, "decrypt failed, unsupported key type");
return -EFAULT;
}
if (plainDek->len <= 0 || plainDek->len > DEK_LEN) {
DEK_LOGE("dek_decrypt_dek, incorrect len=%d\n", plainDek->len);
zero_out((char *)plainDek, sizeof(dek_t));
return -EFAULT;
} else {
#if DEK_DEBUG
DEK_LOGD("plainDek to user: ");
dump(plainDek->buf, plainDek->len);
#endif
}
return 0;
}
long ecryptfs_do_sdp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) {
char filename[NAME_MAX+1] = {0};
void __user *ubuf = (void __user *)arg;
struct dentry *ecryptfs_dentry = file->f_path.dentry;
struct inode *inode = ecryptfs_dentry->d_inode;
struct ecryptfs_crypt_stat *crypt_stat =
&ecryptfs_inode_to_private(inode)->crypt_stat;
struct dentry *fp_dentry =
ecryptfs_inode_to_private(inode)->lower_file->f_dentry;
if (fp_dentry->d_name.len <= NAME_MAX)
memcpy(filename, fp_dentry->d_name.name,
fp_dentry->d_name.len + 1);
DEK_LOGD("ecryptfs_do_sdp_ioctl\n");
if (!(crypt_stat->flags & ECRYPTFS_DEK_SDP_ENABLED)) {
DEK_LOGE("SDP not enabled, skip sdp ioctl\n");
return -ENOTTY;
}
switch (cmd) {
case ECRYPTFS_IOCTL_GET_SDP_INFO: {
dek_arg_get_sdp_info req;
DEK_LOGD("ECRYPTFS_IOCTL_GET_SDP_INFO\n");
memset(&req, 0, sizeof(dek_arg_get_sdp_info));
if(copy_from_user(&req, ubuf, sizeof(req))) {
DEK_LOGE("can't copy from user\n");
return -EFAULT;
} else {
mutex_lock(&crypt_stat->cs_mutex);
if (crypt_stat->flags & ECRYPTFS_DEK_SDP_ENABLED) {
req.sdp_enabled = 1;
} else {
req.sdp_enabled = 0;
}
if (crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE) {
req.is_sensitive = 1;
} else {
req.is_sensitive = 0;
}
req.type = crypt_stat->sdp_dek.type;
mutex_unlock(&crypt_stat->cs_mutex);
}
if(copy_to_user(ubuf, &req, sizeof(req))) {
DEK_LOGE("can't copy to user\n");
return -EFAULT;
}
break;
}
case ECRYPTFS_IOCTL_GET_FEK: {
dek_arg_get_fek req;
DEK_LOGD("ECRYPTFS_IOCTL_GET_FEK\n");
if (crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE) {
DEK_LOGE("don't return FEK of sensitive file\n");
return -EFAULT;
}
memset(&req, 0, sizeof(dek_arg_get_fek));
if(copy_from_user(&req, ubuf, sizeof(req))) {
DEK_LOGE("can't copy from user\n");
memset(&req, 0, sizeof(dek_arg_get_fek));
return -EFAULT;
} else {
mutex_lock(&crypt_stat->cs_mutex);
memcpy(req.dek.buf, crypt_stat->key, crypt_stat->key_size);
req.dek.len = crypt_stat->key_size;
req.dek.type = DEK_TYPE_PLAIN;
mutex_unlock(&crypt_stat->cs_mutex);
}
if(copy_to_user(ubuf, &req, sizeof(req))) {
DEK_LOGE("can't copy to user\n");
memset(&req, 0, sizeof(dek_arg_get_fek));
return -EFAULT;
}
memset(&req, 0, sizeof(dek_arg_get_fek));
break;
}
case ECRYPTFS_IOCTL_GET_EFEK: {
dek_arg_get_efek req;
DEK_LOGD("ECRYPTFS_IOCTL_GET_EFEK\n");
memset(&req, 0, sizeof(dek_arg_get_efek));
if(copy_from_user(&req, ubuf, sizeof(req))) {
DEK_LOGE("can't copy from user\n");
memset(&req, 0, sizeof(dek_arg_get_efek));
return -EFAULT;
} else {
mutex_lock(&crypt_stat->cs_mutex);
memcpy(req.dek.buf, crypt_stat->sdp_dek.buf, crypt_stat->sdp_dek.len);
req.dek.len = crypt_stat->sdp_dek.len;
req.dek.type = crypt_stat->sdp_dek.type;
mutex_unlock(&crypt_stat->cs_mutex);
}
if(copy_to_user(ubuf, &req, sizeof(req))) {
DEK_LOGE("can't copy to user\n");
memset(&req, 0, sizeof(dek_arg_get_efek));
return -EFAULT;
}
memset(&req, 0, sizeof(dek_arg_get_efek));
break;
}
case ECRYPTFS_IOCTL_SET_EFEK: {
dek_arg_set_efek req;
DEK_LOGD("ECRYPTFS_IOCTL_SET_EFEK\n");
memset(&req, 0, sizeof(dek_arg_set_efek));
if(copy_from_user(&req, ubuf, sizeof(req))) {
DEK_LOGE("can't copy from user\n");
memset(&req, 0, sizeof(dek_arg_set_efek));
return -EFAULT;
} else {
if(req.dek.len > DEK_MAXLEN) {
DEK_LOGE("ECRYPTFS_IOCTL_SET_EFEK invalid EFEK len %d\n",
req.dek.len);
return -EINVAL;
}
if (req.dek.type != DEK_TYPE_PLAIN) {
mutex_lock(&crypt_stat->cs_mutex);
memcpy(crypt_stat->sdp_dek.buf, req.dek.buf, req.dek.len);
crypt_stat->sdp_dek.len = req.dek.len;
crypt_stat->sdp_dek.type = req.dek.type;
memset(crypt_stat->key, 0, crypt_stat->key_size);
crypt_stat->flags &= ~(ECRYPTFS_KEY_SET);
mutex_unlock(&crypt_stat->cs_mutex);
ecryptfs_update_crypt_flag(ecryptfs_dentry, 1);
} else {
DEK_LOGE("failed to set EFEK\n");
memset(&req, 0, sizeof(dek_arg_set_efek));
return -EFAULT;
}
}
memset(&req, 0, sizeof(dek_arg_set_efek));
break;
}
default: {
return -EINVAL;
break;
}
}
return 0;
}
static int ecryptfs_update_crypt_flag(struct dentry *dentry, int is_sensitive)
{
int rc = 0;
struct dentry *lower_dentry;
struct inode *inode;
struct inode *lower_inode;
struct ecryptfs_crypt_stat *crypt_stat;
struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
ecryptfs_init_crypt_stat(crypt_stat);
inode = dentry->d_inode;
lower_inode = ecryptfs_inode_to_lower(inode);
lower_dentry = ecryptfs_dentry_to_lower(dentry);
mutex_lock(&crypt_stat->cs_mutex);
mount_crypt_stat = &ecryptfs_superblock_to_private(
dentry->d_sb)->mount_crypt_stat;
rc = ecryptfs_get_lower_file(dentry, inode);
if (rc) {
mutex_unlock(&crypt_stat->cs_mutex);
DEK_LOGE("ecryptfs_get_lower_file rc=%d\n", rc);
goto out;
}
if (is_sensitive) {
crypt_stat->flags |= ECRYPTFS_DEK_IS_SENSITIVE;
/*
* Set sensirive for all the pages in the inode
*/
set_sensitive_mapping_pages(inode->i_mapping, 0, -1);
}
else{
crypt_stat->flags &= ~ECRYPTFS_DEK_IS_SENSITIVE;
}
rc = ecryptfs_write_metadata(dentry, inode);
if (rc) {
if (!(mount_crypt_stat->flags
& ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
rc = -EIO;
DEK_LOGE("Either the lower file "
"is not in a valid eCryptfs format, "
"or the key could not be retrieved. "
"Plaintext passthrough mode is not "
"enabled; returning -EIO\n");
mutex_unlock(&crypt_stat->cs_mutex);
DEK_LOGD("ecryptfs_write_metadata rc=%d\n", rc);
goto out;
}
rc = 0;
crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
| ECRYPTFS_ENCRYPTED);
}
rc = ecryptfs_write_inode_size_to_metadata(inode);
if (rc) {
mutex_unlock(&crypt_stat->cs_mutex);
DEK_LOGE("Problem with "
"ecryptfs_write_inode_size_to_metadata; "
"rc = [%d]\n", rc);
goto out;
}
ecryptfs_put_lower_file(inode);
mutex_unlock(&crypt_stat->cs_mutex);
out:
fsstack_copy_attr_all(inode, lower_inode);
return rc;
}
static long dek_do_ioctl_req(unsigned int minor, unsigned int cmd,
unsigned long arg) {
long ret = 0;
void __user *ubuf = (void __user *)arg;
switch (cmd) {
case DEK_IS_KEK_AVAIL: {
dek_arg_is_kek_avail req;
DEK_LOGD("DEK_IS_KEK_AVAIL\n");
memset(&req, 0, sizeof(dek_arg_is_kek_avail));
if(copy_from_user(&req, ubuf, sizeof(req))) {
DEK_LOGE("can't copy from user\n");
ret = -EFAULT;
goto err;
}
req.ret = is_kek_available(req.userid, req.kek_type);
if(req.ret < 0) {
DEK_LOGE("is_kek_available(id:%d, kek:%d) error\n",
req.userid, req.kek_type);
ret = -ENOENT;
goto err;
}
if(copy_to_user(ubuf, &req, sizeof(req))) {
DEK_LOGE("can't copy to user req\n");
zero_out((char *)&req, sizeof(dek_arg_is_kek_avail));
ret = -EFAULT;
goto err;
}
ret = 0;
}
break;
/*
* Request to generate DEK.
* Generate DEK and return to the user
*/
case DEK_GENERATE_DEK: {
dek_arg_generate_dek req;
DEK_LOGD("DEK_GENERATE_DEK\n");
memset(&req, 0, sizeof(dek_arg_generate_dek));
if(copy_from_user(&req, ubuf, sizeof(req))) {
DEK_LOGE("can't copy from user req\n");
ret = -EFAULT;
goto err;
}
dek_generate_dek(req.userid, &req.dek);
if(copy_to_user(ubuf, &req, sizeof(req))) {
DEK_LOGE("can't copy to user req\n");
zero_out((char *)&req, sizeof(dek_arg_generate_dek));
ret = -EFAULT;
goto err;
}
zero_out((char *)&req, sizeof(dek_arg_generate_dek));
break;
}
/*
* Request to encrypt given DEK.
*
* encrypt dek and return to the user
*/
case DEK_ENCRYPT_DEK: {
dek_arg_encrypt_dek req;
DEK_LOGD("DEK_ENCRYPT_DEK\n");
memset(&req, 0, sizeof(dek_arg_encrypt_dek));
if(copy_from_user(&req, ubuf, sizeof(req))) {
DEK_LOGE("can't copy from user req\n");
zero_out((char *)&req, sizeof(dek_arg_encrypt_dek));
ret = -EFAULT;
goto err;
}
ret = dek_encrypt_dek(req.userid,
&req.plain_dek, &req.enc_dek);
if (ret < 0) {
zero_out((char *)&req, sizeof(dek_arg_encrypt_dek));
goto err;
}
if(copy_to_user(ubuf, &req, sizeof(req))) {
DEK_LOGE("can't copy to user req\n");
zero_out((char *)&req, sizeof(dek_arg_encrypt_dek));
ret = -EFAULT;
goto err;
}
zero_out((char *)&req, sizeof(dek_arg_encrypt_dek));
break;
}
/*
* Request to decrypt given DEK.
*
* Decrypt dek and return to the user.
* When device is locked, private key is not available, so
* the driver must return EPERM or some kind of error.
*/
case DEK_DECRYPT_DEK: {
dek_arg_decrypt_dek req;
DEK_LOGD("DEK_DECRYPT_DEK\n");
memset(&req, 0, sizeof(dek_arg_decrypt_dek));
if(copy_from_user(&req, ubuf, sizeof(req))) {
DEK_LOGE("can't copy from user req\n");
zero_out((char *)&req, sizeof(dek_arg_decrypt_dek));
ret = -EFAULT;
goto err;
}
ret = dek_decrypt_dek(req.userid,
&req.enc_dek, &req.plain_dek);
if (ret < 0) {
zero_out((char *)&req, sizeof(dek_arg_decrypt_dek));
goto err;
}
if(copy_to_user(ubuf, &req, sizeof(req))) {
DEK_LOGE("can't copy to user req\n");
zero_out((char *)&req, sizeof(dek_arg_decrypt_dek));
ret = -EFAULT;
goto err;
}
zero_out((char *)&req, sizeof(dek_arg_decrypt_dek));
break;
}
default:
DEK_LOGE("%s case default\n", __func__);
ret = -EINVAL;
break;
}
return ret;
err:
return ret;
}
static long dek_do_ioctl_kek(unsigned int minor, unsigned int cmd,
unsigned long arg) {
long ret = 0;
void __user *ubuf = (void __user *)arg;
switch (cmd) {
case DEK_GET_KEK: {
dek_arg_get_kek req;
int requested_type = 0;
int userid;
int key_arr_idx;
DEK_LOGD("DEK_GET_KEK\n");
memset(&req, 0, sizeof(dek_arg_get_kek));
if(copy_from_user(&req, ubuf, sizeof(req))) {
DEK_LOGE("can't copy from user kek\n");
ret = -EFAULT;
goto err;
}
userid = req.userid;
if (!dek_is_persona(userid)) {
DEK_LOGE("%s invalid userid %d\n", __func__, userid);
return -EFAULT;
}
key_arr_idx = PERSONA_KEY_ARR_IDX(userid);
requested_type = req.kek_type;
req.key.len = 0;
req.key.type = -1;
switch(requested_type) {
case KEK_TYPE_SYM:
if (SDPK_sym[key_arr_idx].len > 0) {
copy_kek(&req.key, &SDPK_sym[key_arr_idx], KEK_TYPE_SYM);
DEK_LOGD("SDPK_sym len : %d\n", req.key.len);
}else{
DEK_LOGE("SDPK_sym not-available\n");
ret = -EIO;
goto err;
}
break;
case KEK_TYPE_RSA_PUB:
if (SDPK_Rpub[key_arr_idx].len > 0) {
copy_kek(&req.key, &SDPK_Rpub[key_arr_idx], KEK_TYPE_RSA_PUB);
DEK_LOGD("SDPK_Rpub len : %d\n", req.key.len);
} else {
DEK_LOGE("SDPK_Rpub not-available\n");
ret = -EIO;
goto err;
}
break;
case KEK_TYPE_RSA_PRIV:
#ifdef CONFIG_SDP_IOCTL_PRIV
if (SDPK_Rpri[key_arr_idx].len > 0) {
copy_kek(&req.key, &SDPK_Rpri[key_arr_idx], KEK_TYPE_RSA_PRIV);
DEK_LOGD("SDPK_Rpri len : %d\n", req.key.len);
} else {
DEK_LOGE("SDPK_Rpri not-available\n");
ret = -EIO;
goto err;
}
#else
DEK_LOGE("SDPK_Rpri not exposed\n");
ret = -EOPNOTSUPP;
goto err;
#endif
break;
case KEK_TYPE_DH_PUB:
if (SDPK_Dpub[key_arr_idx].len > 0) {
copy_kek(&req.key, &SDPK_Dpub[key_arr_idx], KEK_TYPE_DH_PUB);
DEK_LOGD("SDPK_Dpub len : %d\n", req.key.len);
} else {
DEK_LOGE("SDPK_Dpub not-available\n");
ret = -EIO;
goto err;
}
break;
case KEK_TYPE_DH_PRIV:
#ifdef CONFIG_SDP_IOCTL_PRIV
if (SDPK_Dpri[key_arr_idx].len > 0) {
copy_kek(&req.key, &SDPK_Dpri[key_arr_idx], KEK_TYPE_DH_PRIV);
DEK_LOGD("SDPK_Dpri len : %d\n", req.key.len);
} else {
DEK_LOGE("SDPK_Dpri not-available\n");
ret = -EIO;
goto err;
}
#else
DEK_LOGE("SDPK_Dpri not exposed\n");
ret = -EOPNOTSUPP;
goto err;
#endif
break;
case KEK_TYPE_ECDH256_PUB:
if (SDPK_EDpub[key_arr_idx].len > 0) {
copy_kek(&req.key, &SDPK_EDpub[key_arr_idx], KEK_TYPE_ECDH256_PUB);
DEK_LOGD("SDPK_EDpub len : %d\n", req.key.len);
} else {
DEK_LOGE("SDPK_EDpub not-available\n");
ret = -EIO;
goto err;
}
break;
case KEK_TYPE_ECDH256_PRIV:
#ifdef CONFIG_SDP_IOCTL_PRIV
if (SDPK_EDpri[key_arr_idx].len > 0) {
copy_kek(&req.key, &SDPK_EDpub[key_arr_idx], KEK_TYPE_ECDH256_PRIV);
DEK_LOGD("SDPK_EDpri len : %d\n", req.key.len);
} else {
DEK_LOGE("SDPK_EDpri not-available\n");
ret = -EIO;
goto err;
}
#else
DEK_LOGE("SDPK_EDpri not exposed\n");
ret = -EOPNOTSUPP;
goto err;
#endif
break;
default:
DEK_LOGE("invalid key type\n");
ret = -EINVAL;
goto err;
break;
}
if(copy_to_user(ubuf, &req, sizeof(req))) {
DEK_LOGE("can't copy to user kek\n");
zero_out((char *)&req, sizeof(dek_arg_get_kek));
ret = -EFAULT;
goto err;
}
zero_out((char *)&req, sizeof(dek_arg_get_kek));
break;
}
default:
DEK_LOGE("%s case default\n", __func__);
ret = -EINVAL;
break;
}
return ret;
err:
return ret;
}