[openssl-commits] [openssl] OpenSSL_1_0_2-stable update

Rich Salz rsalz at openssl.org
Tue Feb 23 15:17:29 UTC 2016

The branch OpenSSL_1_0_2-stable has been updated
       via  c436c990f68938fdda1f2bd703bf0cd8dbfa49d2 (commit)
      from  f78baa9d715a00cb691c3c74791308fb131a833c (commit)

- Log -----------------------------------------------------------------
commit c436c990f68938fdda1f2bd703bf0cd8dbfa49d2
Author: David Woodhouse <David.Woodhouse at intel.com>
Date:   Tue Feb 23 14:00:03 2016 +0000

    RT4175: Fix PKCS7_verify() regression with Authenticode signatures
    This is a partial revert of commit c8491de39 ("GH354: Memory leak fixes"),
    which was cherry-picked from commit 55500ea7c in OpenSSL 1.1.
    That commit introduced a change in behaviour which is a regression for
    software implementing Microsoft Authenticode — which requires a PKCS#7
    signature to be validated against explicit external data, even though
    it's a non-detached signature with its own embedded data.
    The is fixed differently in OpenSSL 1.1 by commit 6b2ebe433 ("Add
    PKCS7_NO_DUAL_CONTENT flag"), but that approach isn't viable in the
    1.0.2 stable branch, so just comment the offending check back out again.
    Signed-off-by: Rich Salz <rsalz at openssl.org>
    Reviewed-by: Tim Hudson <tjh at openssl.org>


Summary of changes:
 crypto/pkcs7/pk7_smime.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/crypto/pkcs7/pk7_smime.c b/crypto/pkcs7/pk7_smime.c
index c4d3724..dc9b484 100644
--- a/crypto/pkcs7/pk7_smime.c
+++ b/crypto/pkcs7/pk7_smime.c
@@ -274,12 +274,29 @@ int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
         return 0;
+#if 0
+    /*
+     * NB: this test commented out because some versions of Netscape
+     * illegally include zero length content when signing data. Also
+     * Microsoft Authenticode includes a SpcIndirectDataContent data
+     * structure which describes the content to be protected by the
+     * signature, rather than directly embedding that content. So
+     * Authenticode implementations are also expected to use
+     * PKCS7_verify() with explicit external data, on non-detached
+     * PKCS#7 signatures.
+     *
+     * In OpenSSL 1.1 a new flag PKCS7_NO_DUAL_CONTENT has been
+     * introduced to disable this sanity check. For the 1.0.2 branch
+     * this change is not acceptable, so the check remains completely
+     * commented out (as it has been for a long time).
+     */
     /* Check for data and content: two sets of data */
     if (!PKCS7_get_detached(p7) && indata) {
         return 0;
     sinfos = PKCS7_get_signer_info(p7);

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