[PATCH v7 09/27] mbedtls/external: support PKCS9 Authenticate Attributes

[Raymond Mao]

Populate PKCS9 Authenticate Attributes from signer info if it exists
in a PKCS7 message.
Add OIDs for describing objects using for Authenticate Attributes.

The PR for this patch is at:
https://github.com/Mbed-TLS/mbedtls/pull/9001

For enabling EFI loader PKCS7 features with MbedTLS build,
we need this patch on top of MbedTLS v3.6.0 before it is merged into
the next MbedTLS LTS release.

Signed-off-by: Raymond Mao <raymond.mao at linaro.org>
Acked-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
---
Changes in v2
- None.
Changes in v3
- Update commit message.
Changes in v4
- None.
Changes in v5
- None.
Changes in v6
- None.
Changes in v7
- None.

 .../external/mbedtls/include/mbedtls/oid.h    |  5 +++++
 .../external/mbedtls/include/mbedtls/pkcs7.h  | 11 +++++++++++
 lib/mbedtls/external/mbedtls/library/pkcs7.c  | 19 ++++++++++++++++++-
 3 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/lib/mbedtls/external/mbedtls/include/mbedtls/oid.h b/lib/mbedtls/external/mbedtls/include/mbedtls/oid.h
index 2ee982808fa..43cef99f1e3 100644
--- a/lib/mbedtls/external/mbedtls/include/mbedtls/oid.h
+++ b/lib/mbedtls/external/mbedtls/include/mbedtls/oid.h
@@ -238,6 +238,11 @@
 #define MBEDTLS_OID_RSA_SHA_OBS         "\x2B\x0E\x03\x02\x1D"
 
 #define MBEDTLS_OID_PKCS9_EMAIL         MBEDTLS_OID_PKCS9 "\x01" /**< emailAddress AttributeType ::= { pkcs-9 1 } */
+#define MBEDTLS_OID_PKCS9_CONTENTTYPE   MBEDTLS_OID_PKCS9 "\x03" /**< contentType AttributeType ::= { pkcs-9 3 } */
+#define MBEDTLS_OID_PKCS9_MESSAGEDIGEST MBEDTLS_OID_PKCS9 "\x04" /**< messageDigest AttributeType ::= { pkcs-9 4 } */
+#define MBEDTLS_OID_PKCS9_SIGNINGTIME   MBEDTLS_OID_PKCS9 "\x05" /**< signingTime AttributeType ::= { pkcs-9 5 } */
+#define MBEDTLS_OID_PKCS9_SMIMECAP      MBEDTLS_OID_PKCS9 "\x0f" /**< smimeCapabilites AttributeType ::= { pkcs-9 15 } */
+#define MBEDTLS_OID_PKCS9_SMIMEAA       MBEDTLS_OID_PKCS9 "\x10\x02\x0b" /**< smimeCapabilites AttributeType ::= { pkcs-9 16 2 11} */
 
 /* RFC 4055 */
 #define MBEDTLS_OID_RSASSA_PSS          MBEDTLS_OID_PKCS1 "\x0a" /**< id-RSASSA-PSS ::= { pkcs-1 10 } */
diff --git a/lib/mbedtls/external/mbedtls/include/mbedtls/pkcs7.h b/lib/mbedtls/external/mbedtls/include/mbedtls/pkcs7.h
index 9e29b74af70..a88a5e858fc 100644
--- a/lib/mbedtls/external/mbedtls/include/mbedtls/pkcs7.h
+++ b/lib/mbedtls/external/mbedtls/include/mbedtls/pkcs7.h
@@ -102,6 +102,16 @@ typedef enum {
 }
 mbedtls_pkcs7_type;
 
+/*
+ * Authenticate Attributes for MicroSoft Authentication Code using in U-Boot
+ * Secure Boot
+ */
+typedef struct mbedtls_pkcs7_authattrs {
+    size_t data_len;
+    void *data;
+}
+mbedtls_pkcs7_authattrs;
+
 /**
  * Structure holding PKCS #7 signer info
  */
@@ -113,6 +123,7 @@ typedef struct mbedtls_pkcs7_signer_info {
     mbedtls_x509_buf MBEDTLS_PRIVATE(alg_identifier);
     mbedtls_x509_buf MBEDTLS_PRIVATE(sig_alg_identifier);
     mbedtls_x509_buf MBEDTLS_PRIVATE(sig);
+    mbedtls_pkcs7_authattrs authattrs;
     struct mbedtls_pkcs7_signer_info *MBEDTLS_PRIVATE(next);
 }
 mbedtls_pkcs7_signer_info;
diff --git a/lib/mbedtls/external/mbedtls/library/pkcs7.c b/lib/mbedtls/external/mbedtls/library/pkcs7.c
index 0c2436b56b7..da73fb341d6 100644
--- a/lib/mbedtls/external/mbedtls/library/pkcs7.c
+++ b/lib/mbedtls/external/mbedtls/library/pkcs7.c
@@ -288,6 +288,7 @@ static int pkcs7_get_signer_info(unsigned char **p, unsigned char *end,
     unsigned char *end_signer, *end_issuer_and_sn;
     int asn1_ret = 0, ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     size_t len = 0;
+    unsigned char *tmp_p;
 
     asn1_ret = mbedtls_asn1_get_tag(p, end, &len, MBEDTLS_ASN1_CONSTRUCTED
                                     | MBEDTLS_ASN1_SEQUENCE);
@@ -349,7 +350,23 @@ static int pkcs7_get_signer_info(unsigned char **p, unsigned char *end,
         goto out;
     }
 
-    /* Assume authenticatedAttributes is nonexistent */
+    /* Save authenticatedAttributes if present */
+    if (*p < end_signer &&
+        **p == (MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0)) {
+        tmp_p = *p;
+
+        ret = mbedtls_asn1_get_tag(p, end_signer, &len,
+                                   MBEDTLS_ASN1_CONTEXT_SPECIFIC |
+                                   MBEDTLS_ASN1_CONSTRUCTED | 0);
+        if (ret != 0) {
+            goto out;
+        }
+
+        signer->authattrs.data = tmp_p;
+        signer->authattrs.data_len = len + *p - tmp_p;
+        *p += len;
+    }
+
     ret = pkcs7_get_digest_algorithm(p, end_signer, &signer->sig_alg_identifier);
     if (ret != 0) {
         goto out;
-- 
2.25.1