linux-kernel - Re: [RFC][PATCH 6/6] ecryptfs: added support for the encrypted key type

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Date:	Fri, 24 Dec 2010 10:47:57 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Roberto Sassu <roberto.sassu@...ito.it>
Cc:	linux-security-module@...r.kernel.org, keyrings@...ux-nfs.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Howells <dhowells@...hat.com>,
	James Morris <jmorris@...ei.org>,
	David Safford <safford@...son.ibm.com>,
	Gianluca Ramunno <ramunno@...ito.it>,
	Tyler Hicks <tyhicks@...ux.vnet.ibm.com>,
	kirkland@...onical.com
Subject: Re: [RFC][PATCH 6/6] ecryptfs: added support for the encrypted key
 type

On Thu, 2010-12-23 at 18:36 +0100, Roberto Sassu wrote: 
> The function ecryptfs_keyring_auth_tok_for_sig() has been modified in order
> to search keys of both 'user' and 'encrypted' types.
> 
> Signed-off-by: Roberto Sassu <roberto.sassu@...ito.it>
> ---
>  fs/ecryptfs/ecryptfs_kernel.h |   11 +++++++++--
>  fs/ecryptfs/keystore.c        |   15 +++++++++++----
>  2 files changed, 20 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
> index a27cad4..068eade 100644
> --- a/fs/ecryptfs/ecryptfs_kernel.h
> +++ b/fs/ecryptfs/ecryptfs_kernel.h
> @@ -29,6 +29,7 @@
>  #define ECRYPTFS_KERNEL_H
>  
>  #include <keys/user-type.h>
> +#include <keys/encrypted-type.h>
>  #include <linux/fs.h>
>  #include <linux/fs_stack.h>
>  #include <linux/namei.h>
> @@ -81,8 +82,14 @@ struct ecryptfs_page_crypt_context {
>  static inline struct ecryptfs_auth_tok *
>  ecryptfs_get_key_payload_data(struct key *key)
>  {
> -	return (struct ecryptfs_auth_tok *)
> -		(((struct user_key_payload*)key->payload.data)->data);
> +#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
> +	if (key->type == &key_type_encrypted)
> +		return (struct ecryptfs_auth_tok *)
> +			(&((struct encrypted_key_payload *)key->payload.data)->payload_data);
> +	else
> +#endif
> +		return (struct ecryptfs_auth_tok *)
> +			(((struct user_key_payload *)key->payload.data)->data);
>  }

'ifdefs' belong in include files. How about defining
ecryptfs_get_encrypted_key_payload_data() with stub function?


> #define ECRYPTFS_SUPER_MAGIC 0xf15f
> diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
> index 73811cf..8d72635 100644
> --- a/fs/ecryptfs/keystore.c
> +++ b/fs/ecryptfs/keystore.c
> @@ -1542,10 +1542,17 @@ int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
>  
>  	(*auth_tok_key) = request_key(&key_type_user, sig, NULL);
>  	if (!(*auth_tok_key) || IS_ERR(*auth_tok_key)) {
> -		printk(KERN_ERR "Could not find key with description: [%s]\n",
> -		       sig);
> -		rc = process_request_key_err(PTR_ERR(*auth_tok_key));
> -		goto out;
> +#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
> +		(*auth_tok_key) = request_key(&key_type_encrypted, sig, NULL);
> +		if (!(*auth_tok_key) || IS_ERR(*auth_tok_key)) {
> +#endif
> +			printk(KERN_ERR "Could not find key with description: [%s]\n",
> +			      sig);
> +			rc = process_request_key_err(PTR_ERR(*auth_tok_key));
> +			goto out;
> +#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
> +		}
> +#endif

Same here.

thanks,

Mimi

> 	}
>  	(*auth_tok) = ecryptfs_get_key_payload_data(*auth_tok_key);
>  	if (ecryptfs_verify_version((*auth_tok)->version)) {



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