7e70cb4978
Define a new kernel key-type called 'encrypted'. Encrypted keys are kernel generated random numbers, which are encrypted/decrypted with a 'trusted' symmetric key. Encrypted keys are created/encrypted/decrypted in the kernel. Userspace only ever sees/stores encrypted blobs. Changelog: - bug fix: replaced master-key rcu based locking with semaphore (reported by David Howells) - Removed memset of crypto_shash_digest() digest output - Replaced verification of 'key-type:key-desc' using strcspn(), with one based on string constants. - Moved documentation to Documentation/keys-trusted-encrypted.txt - Replace hash with shash (based on comments by David Howells) - Make lengths/counts size_t where possible (based on comments by David Howells) Could not convert most lengths, as crypto expects 'unsigned int' (size_t: on 32 bit is defined as unsigned int, but on 64 bit is unsigned long) - Add 'const' where possible (based on comments by David Howells) - allocate derived_buf dynamically to support arbitrary length master key (fixed by Roberto Sassu) - wait until late_initcall for crypto libraries to be registered - cleanup security/Kconfig - Add missing 'update' keyword (reported/fixed by Roberto Sassu) - Free epayload on failure to create key (reported/fixed by Roberto Sassu) - Increase the data size limit (requested by Roberto Sassu) - Crypto return codes are always 0 on success and negative on failure, remove unnecessary tests. - Replaced kzalloc() with kmalloc() Signed-off-by: Mimi Zohar <zohar@us.ibm.com> Signed-off-by: David Safford <safford@watson.ibm.com> Reviewed-by: Roberto Sassu <roberto.sassu@polito.it> Signed-off-by: James Morris <jmorris@namei.org>
29 lines
914 B
C
29 lines
914 B
C
/*
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* Copyright (C) 2010 IBM Corporation
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* Author: Mimi Zohar <zohar@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*/
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#ifndef _KEYS_ENCRYPTED_TYPE_H
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#define _KEYS_ENCRYPTED_TYPE_H
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#include <linux/key.h>
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#include <linux/rcupdate.h>
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struct encrypted_key_payload {
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struct rcu_head rcu;
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char *master_desc; /* datablob: master key name */
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char *datalen; /* datablob: decrypted key length */
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u8 *iv; /* datablob: iv */
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u8 *encrypted_data; /* datablob: encrypted data */
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unsigned short datablob_len; /* length of datablob */
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unsigned short decrypted_datalen; /* decrypted data length */
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u8 decrypted_data[0]; /* decrypted data + datablob + hmac */
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};
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extern struct key_type key_type_encrypted;
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#endif /* _KEYS_ENCRYPTED_TYPE_H */
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