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Message-Id: <20170804220330.30026-4-bauerman@linux.vnet.ibm.com>
Date: Fri, 4 Aug 2017 19:03:26 -0300
From: Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>
To: linux-security-module@...r.kernel.org
Cc: linux-ima-devel@...ts.sourceforge.net, keyrings@...r.kernel.org,
linux-crypto@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-kernel@...r.kernel.org,
Mimi Zohar <zohar@...ux.vnet.ibm.com>,
Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
James Morris <james.l.morris@...cle.com>,
"Serge E. Hallyn" <serge@...lyn.com>,
David Howells <dhowells@...hat.com>,
David Woodhouse <dwmw2@...radead.org>,
Jessica Yu <jeyu@...hat.com>,
Rusty Russell <rusty@...tcorp.com.au>,
Herbert Xu <herbert@...dor.apana.org.au>,
"David S. Miller" <davem@...emloft.net>,
"AKASHI, Takahiro" <takahiro.akashi@...aro.org>,
Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>
Subject: [PATCH v4 3/7] PKCS#7: Introduce pkcs7_get_message_sig and verify_pkcs7_message_sig
IMA will need to access the digest used in the signature so that it can
verify files containing module-style appended signatures. For this purpose,
add function pkcs7_get_message_sig.
It will also need to verify an already parsed PKCS#7 message. For this
purpose, add function verify_pkcs7_message_signature which takes a struct
pkcs7_message for verification instead of the raw bytes that
verify_pkcs7_signature takes.
Signed-off-by: Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>
---
certs/system_keyring.c | 60 +++++++++++++++++++++++++----------
crypto/asymmetric_keys/pkcs7_parser.c | 12 +++++++
include/crypto/pkcs7.h | 2 ++
include/linux/verification.h | 10 ++++++
4 files changed, 68 insertions(+), 16 deletions(-)
diff --git a/certs/system_keyring.c b/certs/system_keyring.c
index 6251d1b27f0c..6a8684959780 100644
--- a/certs/system_keyring.c
+++ b/certs/system_keyring.c
@@ -190,33 +190,26 @@ 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");
@@ -258,6 +251,41 @@ 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/crypto/asymmetric_keys/pkcs7_parser.c b/crypto/asymmetric_keys/pkcs7_parser.c
index af4cd8649117..e41beda297a8 100644
--- a/crypto/asymmetric_keys/pkcs7_parser.c
+++ b/crypto/asymmetric_keys/pkcs7_parser.c
@@ -673,3 +673,15 @@ int pkcs7_note_signed_info(void *context, size_t hdrlen,
return -ENOMEM;
return 0;
}
+
+/**
+ * pkcs7_get_message_sig - get signature in @pkcs7
+ *
+ * This function doesn't meaningfully support messages with more than one
+ * signature. It will always return the first signature.
+ */
+const struct public_key_signature *pkcs7_get_message_sig(
+ const struct pkcs7_message *pkcs7)
+{
+ return pkcs7->signed_infos ? pkcs7->signed_infos->sig : NULL;
+}
diff --git a/include/crypto/pkcs7.h b/include/crypto/pkcs7.h
index 583f199400a3..6f51d0cb6d12 100644
--- a/include/crypto/pkcs7.h
+++ b/include/crypto/pkcs7.h
@@ -28,6 +28,8 @@ extern void pkcs7_free_message(struct pkcs7_message *pkcs7);
extern int pkcs7_get_content_data(const struct pkcs7_message *pkcs7,
const void **_data, size_t *_datalen,
size_t *_headerlen);
+extern const struct public_key_signature *pkcs7_get_message_sig(
+ const struct pkcs7_message *pkcs7);
/*
* pkcs7_trust.c
diff --git a/include/linux/verification.h b/include/linux/verification.h
index a10549a6c7cd..f04dac2728ec 100644
--- a/include/linux/verification.h
+++ b/include/linux/verification.h
@@ -29,6 +29,7 @@ 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,
@@ -38,6 +39,15 @@ 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,
--
2.13.0
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