int dek_encrypt_dek_efs(int persona_id, dek *plainDek, dek *encDek) { if (!dek_is_persona(persona_id)) { return -EFAULT; } return dek_encrypt_dek(persona_id, plainDek, encDek); }
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; 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); cleanup = evt; printk("dek: DEK_ON_BOOT\n"); //memset(&evt, 0, sizeof(dek_arg_on_boot)); if(copy_from_user(evt, ubuf, sizeof(dek_arg_on_boot))) { printk("dek: can't copy from user\n"); ret = -EFAULT; goto err; } if (!dek_is_persona(evt->persona_id)) { ret = -EFAULT; goto err; } ret = dek_on_boot(evt); if (ret < 0) { dek_add_to_log(evt->persona_id, "Boot failed"); goto err; } dek_add_to_log(evt->persona_id, "Booted"); break; } /* * Event when device is locked. * * Nullify private key which prevents decryption. */ case DEK_ON_DEVICE_LOCKED: { //dek_arg_on_device_locked evt; dek_arg_on_device_locked *evt = kzalloc(sizeof(dek_arg_on_device_locked), GFP_KERNEL); cleanup = evt; printk("dek: DEK_ON_DEVICE_LOCKED\n"); //memset(&evt, 0, sizeof(dek_arg_on_device_locked)); if(copy_from_user(evt, ubuf, sizeof(dek_arg_on_device_locked))) { printk("dek: can't copy from user\n"); ret = -EFAULT; goto err; } if (!dek_is_persona(evt->persona_id)) { ret = -EFAULT; goto err; } ret = dek_on_device_locked(evt); if (ret < 0) { dek_add_to_log(evt->persona_id, "Lock failed"); goto err; } dek_add_to_log(evt->persona_id, "Locked"); printk("dek: after locked for id: %d\n", evt->persona_id); break; } /* * Event when device unlocked. * * Read private key and decrypt with user password. */ case DEK_ON_DEVICE_UNLOCKED: { //dek_arg_on_device_unlocked evt; dek_arg_on_device_unlocked *evt = kzalloc(sizeof(dek_arg_on_device_unlocked), GFP_KERNEL); cleanup = evt; printk("dek: DEK_ON_DEVICE_UNLOCKED\n"); //memset(&evt, 0, sizeof(dek_arg_on_device_unlocked)); if(copy_from_user(evt, ubuf, sizeof(dek_arg_on_device_unlocked))) { printk("dek: can't copy from user\n"); ret = -EFAULT; goto err; } if (!dek_is_persona(evt->persona_id)) { ret = -EFAULT; goto err; } ret = dek_on_device_unlocked(evt); if (ret < 0) { dek_add_to_log(evt->persona_id, "Unlock failed"); goto err; } dek_add_to_log(evt->persona_id, "Unlocked"); memset(evt, 0, sizeof(dek_arg_on_device_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; dek_arg_on_user_added *evt = kzalloc(sizeof(dek_arg_on_user_added), GFP_KERNEL); cleanup = evt; printk("dek: DEK_ON_USER_ADDED\n"); //memset(&evt, 0, sizeof(dek_arg_on_user_added)); if(copy_from_user(evt, ubuf, sizeof(dek_arg_on_user_added))) { printk("dek: can't copy from user\n"); ret = -EFAULT; goto err; } if (!dek_is_persona(evt->persona_id)) { ret = -EFAULT; goto err; } ret = dek_on_user_added(evt); if (ret < 0) { dek_add_to_log(evt->persona_id, "Add user failed"); goto err; } dek_add_to_log(evt->persona_id, "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; printk("dek: DEK_ON_USER_REMOVED\n"); memset(&evt, 0, sizeof(dek_arg_on_user_removed)); if(copy_from_user(&evt, ubuf, sizeof(evt))) { printk("dek: can't copy from user\n"); ret = -EFAULT; goto err; } if (!dek_is_persona(evt.persona_id)) { ret = -EFAULT; goto err; } ret = dek_on_user_removed(&evt); if (ret < 0) { dek_add_to_log(evt.persona_id, "Remove user failed"); goto err; } dek_add_to_log(evt.persona_id, "Removed user"); break; } /* * Event when password changed. * * Encrypt priv_key with new password and store it. */ case DEK_ON_CHANGE_PASSWORD: { printk("dek: DEK_ON_CHANGE_PASSWORD << deprecated. SKIP\n"); ret = 0; dek_add_to_log(0, "Changed password << deprecated"); break; } default: printk("dek: case default\n"); ret = -EINVAL; break; } err: if (cleanup) { kfree(cleanup); } return ret; }
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_encrypt_dek(int userid, dek_t *plainDek, dek_t *encDek) { int ret = 0; int key_arr_idx; 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("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 */ switch(get_sdp_sysfs_asym_alg()) { case SDPK_ALGOTYPE_ASYMM_RSA: if(SDPK_Rpub[key_arr_idx].len > 0) { ret = rsa_encryptByPub(plainDek, encDek, &SDPK_Rpub[key_arr_idx]); }else{ DEK_LOGE("SDPK_Rpub for id: %d\n", userid); dek_add_to_log(userid, "encrypt failed, no SDPK_Rpub"); return -EIO; } break; case SDPK_ALGOTYPE_ASYMM_DH: 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; } break; case SDPK_ALGOTYPE_ASYMM_ECDH: if(SDPK_EDpub[key_arr_idx].len > 0) { ret = ecdh_encryptDEK(plainDek, encDek, &SDPK_EDpub[key_arr_idx]); }else{ DEK_LOGE("SDPK_EDpub for id: %d\n", userid); dek_add_to_log(userid, "encrypt failed, no SDPK_EDpub"); return -EIO; } break; default: dek_add_to_log(userid, "no ASYMM algo supported"); return -EOPNOTSUPP; } #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: "); dek_dump(encDek->buf, encDek->len); } #endif 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; }
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; }