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authorEric Biggers <ebiggers@google.com>2018-02-22 14:38:33 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-02-28 10:19:39 +0100
commit29e76b211e9231e1d565551de84d9abd6eff5658 (patch)
treea987b3c2e4a617ab330e826730ee07310ee5c0b3
parent1a1f7f726bd8670b7b371f4e440533cdcb9d8110 (diff)
PKCS#7: fix certificate blacklisting
commit 29f4a67c17e19314b7d74b8569be935e6c7edf50 upstream. If there is a blacklisted certificate in a SignerInfo's certificate chain, then pkcs7_verify_sig_chain() sets sinfo->blacklisted and returns 0. But, pkcs7_verify() fails to handle this case appropriately, as it actually continues on to the line 'actual_ret = 0;', indicating that the SignerInfo has passed verification. Consequently, PKCS#7 signature verification ignores the certificate blacklist. Fix this by not considering blacklisted SignerInfos to have passed verification. Also fix the function comment with regards to when 0 is returned. Fixes: 03bb79315ddc ("PKCS#7: Handle blacklisted certificates") Cc: <stable@vger.kernel.org> # v4.12+ Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--crypto/asymmetric_keys/pkcs7_verify.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/crypto/asymmetric_keys/pkcs7_verify.c b/crypto/asymmetric_keys/pkcs7_verify.c
index d418b725dfef..a18295651077 100644
--- a/crypto/asymmetric_keys/pkcs7_verify.c
+++ b/crypto/asymmetric_keys/pkcs7_verify.c
@@ -369,8 +369,7 @@ static int pkcs7_verify_one(struct pkcs7_message *pkcs7,
*
* (*) -EBADMSG if some part of the message was invalid, or:
*
- * (*) 0 if no signature chains were found to be blacklisted or to contain
- * unsupported crypto, or:
+ * (*) 0 if a signature chain passed verification, or:
*
* (*) -EKEYREJECTED if a blacklisted key was encountered, or:
*
@@ -426,8 +425,11 @@ int pkcs7_verify(struct pkcs7_message *pkcs7,
for (sinfo = pkcs7->signed_infos; sinfo; sinfo = sinfo->next) {
ret = pkcs7_verify_one(pkcs7, sinfo);
- if (sinfo->blacklisted && actual_ret == -ENOPKG)
- actual_ret = -EKEYREJECTED;
+ if (sinfo->blacklisted) {
+ if (actual_ret == -ENOPKG)
+ actual_ret = -EKEYREJECTED;
+ continue;
+ }
if (ret < 0) {
if (ret == -ENOPKG) {
sinfo->unsupported_crypto = true;