1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2005-2010 IBM Corporation
19 #include <keys/encrypted-type.h>
24 #define EVMKEY "evm-key"
41  * evm_set_key() - set EVM HMAC key from the kernel
46  * without using the "encrypted" key subsystem keys. It can be used
48  * keys.
56 	rc = -EBUSY;  in evm_set_key()
59 	rc = -EINVAL;  in evm_set_key()
84 			return ERR_PTR(-ENOKEY);  in init_desc()
90 			return ERR_PTR(-EINVAL);  in init_desc()
100 		goto unlock;  in init_desc()
118 unlock:  in init_desc()
124 		return ERR_PTR(-ENOMEM);  in init_desc()
126 	desc->tfm = *tfm;  in init_desc()
158 		hmac_misc.ino = inode->i_ino;  in hmac_add_misc()
159 		hmac_misc.generation = inode->i_generation;  in hmac_add_misc()
169 	hmac_misc.uid = from_kuid(&init_user_ns, inode->i_uid);  in hmac_add_misc()
170 	hmac_misc.gid = from_kgid(&init_user_ns, inode->i_gid);  in hmac_add_misc()
171 	hmac_misc.mode = inode->i_mode;  in hmac_add_misc()
175 		crypto_shash_update(desc, (u8 *)&inode->i_sb->s_uuid, UUID_SIZE);  in hmac_add_misc()
208  * each xattr, but attempt to re-use the previously allocated memory.
225 	if (!(inode->i_opflags & IOP_XATTR) ||  in evm_calc_hmac_or_hash()
226 	    inode->i_sb->s_user_ns != &init_user_ns)  in evm_calc_hmac_or_hash()
227 		return -EOPNOTSUPP;  in evm_calc_hmac_or_hash()
229 	desc = init_desc(type, data->hdr.algo);  in evm_calc_hmac_or_hash()
233 	data->hdr.length = crypto_shash_digestsize(desc->tfm);  in evm_calc_hmac_or_hash()
235 	error = -ENODATA;  in evm_calc_hmac_or_hash()
239 		if (strcmp(xattr->name, XATTR_NAME_IMA) == 0)  in evm_calc_hmac_or_hash()
243 		 * Skip non-enabled xattrs for locally calculated  in evm_calc_hmac_or_hash()
246 		if (type != EVM_XATTR_PORTABLE_DIGSIG && !xattr->enabled)  in evm_calc_hmac_or_hash()
250 		    && !strcmp(xattr->name, req_xattr_name)) {  in evm_calc_hmac_or_hash()
268 		size = vfs_getxattr_alloc(&init_user_ns, dentry, xattr->name,  in evm_calc_hmac_or_hash()
270 		if (size == -ENOMEM) {  in evm_calc_hmac_or_hash()
271 			error = -ENOMEM;  in evm_calc_hmac_or_hash()
278 					       xattr->name, NULL, 0);  in evm_calc_hmac_or_hash()
281 				 dentry->d_name.name, xattr->name, size,  in evm_calc_hmac_or_hash()
290 			pr_debug("%s: (%zu) [%*phN]", xattr->name, xattr_size,  in evm_calc_hmac_or_hash()
293 			dump_security_xattr(xattr->name, xattr_value,  in evm_calc_hmac_or_hash()
296 	hmac_add_misc(desc, inode, type, data->digest);  in evm_calc_hmac_or_hash()
300 		error = -EPERM;  in evm_calc_hmac_or_hash()
330 	if (iint && (iint->flags & EVM_IMMUTABLE_DIGSIG))  in evm_is_immutable()
337 		if (rc == -ENODATA)  in evm_is_immutable()
341 	if (xattr_data->type == EVM_XATTR_PORTABLE_DIGSIG)  in evm_is_immutable()
371 		return -EPERM;  in evm_update_evmxattr()
382 	} else if (rc == -ENODATA && (inode->i_opflags & IOP_XATTR)) {  in evm_update_evmxattr()
399 	crypto_shash_update(desc, lsm_xattr->value, lsm_xattr->value_len);  in evm_init_hmac()
406  * Get the key from the TPM for the SHA1-HMAC
416 		return -ENOENT;  in evm_init_key()
418 	down_read(&evm_key->sem);  in evm_init_key()
419 	ekp = evm_key->payload.data[0];  in evm_init_key()
421 	rc = evm_set_key(ekp->decrypted_data, ekp->decrypted_datalen);  in evm_init_key()
424 	memset(ekp->decrypted_data, 0, ekp->decrypted_datalen);  in evm_init_key()
425 	up_read(&evm_key->sem);  in evm_init_key()