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SubjectRe: [PATCH v11 02/13] PKCS#7: Refactor verify_pkcs7_signature()
Date

Hello David,

AFAIK Mimi is happy with this patch set, but I still need acks from
maintainers of other subsystems that my changes touch before she can
accept it.

Are this patch and the next one ("PKCS#7: Introduce pkcs7_get_digest()")
OK from your PoV?

--
Thiago Jung Bauermann
IBM Linux Technology Center


Thiago Jung Bauermann <bauerman@linux.ibm.com> writes:

> IMA will need to verify a PKCS#7 signature which has already been parsed.
> For this reason, factor out the code which does that from
> verify_pkcs7_signature() into a new function which takes a struct
> pkcs7_message instead of a data buffer.
>
> Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
> Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
> Cc: David Howells <dhowells@redhat.com>
> Cc: David Woodhouse <dwmw2@infradead.org>
> Cc: Herbert Xu <herbert@gondor.apana.org.au>
> Cc: "David S. Miller" <davem@davemloft.net>
> ---
> certs/system_keyring.c | 61 ++++++++++++++++++++++++++----------
> include/linux/verification.h | 10 ++++++
> 2 files changed, 55 insertions(+), 16 deletions(-)
>
> diff --git a/certs/system_keyring.c b/certs/system_keyring.c
> index c05c29ae4d5d..4ba82e52e4b4 100644
> --- a/certs/system_keyring.c
> +++ b/certs/system_keyring.c
> @@ -194,33 +194,27 @@ late_initcall(load_system_certificate_list);
> #ifdef CONFIG_SYSTEM_DATA_VERIFICATION
>
> /**
> - * verify_pkcs7_signature - Verify a PKCS#7-based signature on system data.
> + * verify_pkcs7_message_sig - Verify a PKCS#7-based signature on system data.
> * @data: The data to be verified (NULL if expecting internal data).
> * @len: Size of @data.
> - * @raw_pkcs7: The PKCS#7 message that is the signature.
> - * @pkcs7_len: The size of @raw_pkcs7.
> + * @pkcs7: The PKCS#7 message that is the signature.
> * @trusted_keys: Trusted keys to use (NULL for builtin trusted keys only,
> * (void *)1UL for all trusted keys).
> * @usage: The use to which the key is being put.
> * @view_content: Callback to gain access to content.
> * @ctx: Context for callback.
> */
> -int verify_pkcs7_signature(const void *data, size_t len,
> - const void *raw_pkcs7, size_t pkcs7_len,
> - struct key *trusted_keys,
> - enum key_being_used_for usage,
> - int (*view_content)(void *ctx,
> - const void *data, size_t len,
> - size_t asn1hdrlen),
> - void *ctx)
> +int verify_pkcs7_message_sig(const void *data, size_t len,
> + struct pkcs7_message *pkcs7,
> + struct key *trusted_keys,
> + enum key_being_used_for usage,
> + int (*view_content)(void *ctx,
> + const void *data, size_t len,
> + size_t asn1hdrlen),
> + void *ctx)
> {
> - struct pkcs7_message *pkcs7;
> int ret;
>
> - pkcs7 = pkcs7_parse_message(raw_pkcs7, pkcs7_len);
> - if (IS_ERR(pkcs7))
> - return PTR_ERR(pkcs7);
> -
> /* The data should be detached - so we need to supply it. */
> if (data && pkcs7_supply_detached_data(pkcs7, data, len) < 0) {
> pr_err("PKCS#7 signature with non-detached data\n");
> @@ -273,6 +267,41 @@ int verify_pkcs7_signature(const void *data, size_t len,
> }
>
> error:
> + pr_devel("<==%s() = %d\n", __func__, ret);
> + return ret;
> +}
> +
> +/**
> + * verify_pkcs7_signature - Verify a PKCS#7-based signature on system data.
> + * @data: The data to be verified (NULL if expecting internal data).
> + * @len: Size of @data.
> + * @raw_pkcs7: The PKCS#7 message that is the signature.
> + * @pkcs7_len: The size of @raw_pkcs7.
> + * @trusted_keys: Trusted keys to use (NULL for builtin trusted keys only,
> + * (void *)1UL for all trusted keys).
> + * @usage: The use to which the key is being put.
> + * @view_content: Callback to gain access to content.
> + * @ctx: Context for callback.
> + */
> +int verify_pkcs7_signature(const void *data, size_t len,
> + const void *raw_pkcs7, size_t pkcs7_len,
> + struct key *trusted_keys,
> + enum key_being_used_for usage,
> + int (*view_content)(void *ctx,
> + const void *data, size_t len,
> + size_t asn1hdrlen),
> + void *ctx)
> +{
> + struct pkcs7_message *pkcs7;
> + int ret;
> +
> + pkcs7 = pkcs7_parse_message(raw_pkcs7, pkcs7_len);
> + if (IS_ERR(pkcs7))
> + return PTR_ERR(pkcs7);
> +
> + ret = verify_pkcs7_message_sig(data, len, pkcs7, trusted_keys, usage,
> + view_content, ctx);
> +
> pkcs7_free_message(pkcs7);
> pr_devel("<==%s() = %d\n", __func__, ret);
> return ret;
> diff --git a/include/linux/verification.h b/include/linux/verification.h
> index 018fb5f13d44..5e1d41f2b336 100644
> --- a/include/linux/verification.h
> +++ b/include/linux/verification.h
> @@ -36,6 +36,7 @@ extern const char *const key_being_used_for[NR__KEY_BEING_USED_FOR];
> #ifdef CONFIG_SYSTEM_DATA_VERIFICATION
>
> struct key;
> +struct pkcs7_message;
>
> extern int verify_pkcs7_signature(const void *data, size_t len,
> const void *raw_pkcs7, size_t pkcs7_len,
> @@ -45,6 +46,15 @@ extern int verify_pkcs7_signature(const void *data, size_t len,
> const void *data, size_t len,
> size_t asn1hdrlen),
> void *ctx);
> +extern int verify_pkcs7_message_sig(const void *data, size_t len,
> + struct pkcs7_message *pkcs7,
> + struct key *trusted_keys,
> + enum key_being_used_for usage,
> + int (*view_content)(void *ctx,
> + const void *data,
> + size_t len,
> + size_t asn1hdrlen),
> + void *ctx);
>
> #ifdef CONFIG_SIGNED_PE_FILE_VERIFICATION
> extern int verify_pefile_signature(const void *pebuf, unsigned pelen,

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