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Subject[PATCH12/17] pefile: Strip the wrapper off of the cert data block
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The certificate data block in a PE binary has a wrapper around the PKCS#7
signature we actually want to get at. Strip this off and check that we've got
something that appears to be a PKCS#7 signature.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
---

crypto/asymmetric_keys/verify_pefile.c | 71 ++++++++++++++++++++++++++++++++
1 file changed, 71 insertions(+)


diff --git a/crypto/asymmetric_keys/verify_pefile.c b/crypto/asymmetric_keys/verify_pefile.c
index aec7c50..2f5268c 100644
--- a/crypto/asymmetric_keys/verify_pefile.c
+++ b/crypto/asymmetric_keys/verify_pefile.c
@@ -15,6 +15,7 @@
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/pe.h>
+#include <linux/asn1.h>
#include <crypto/pkcs7.h>
#include <crypto/hash.h>
#include "verify_pefile.h"
@@ -118,6 +119,72 @@ static int pefile_parse_binary(const void *pebuf, unsigned int pelen,
return 0;
}

+/*
+ * Check and strip the PE wrapper from around the signature and check that the
+ * remnant looks something like PKCS#7.
+ */
+static int pefile_strip_sig_wrapper(const void *pebuf,
+ struct pefile_context *ctx)
+{
+ struct win_certificate wrapper;
+ const u8 *pkcs7;
+
+ if (ctx->sig_len < sizeof(wrapper)) {
+ pr_debug("Signature wrapper too short\n");
+ return -ELIBBAD;
+ }
+
+ memcpy(&wrapper, pebuf + ctx->sig_offset, sizeof(wrapper));
+ pr_debug("sig wrapper = { %x, %x, %x }\n",
+ wrapper.length, wrapper.revision, wrapper.cert_type);
+
+ /* Both pesign and sbsign round up the length of certificate table
+ * (in optional header data directories) to 8 byte alignment.
+ */
+ if (round_up(wrapper.length, 8) != ctx->sig_len) {
+ pr_debug("Signature wrapper len wrong\n");
+ return -ELIBBAD;
+ }
+ if (wrapper.revision != WIN_CERT_REVISION_2_0) {
+ pr_debug("Signature is not revision 2.0\n");
+ return -ENOTSUPP;
+ }
+ if (wrapper.cert_type != WIN_CERT_TYPE_PKCS_SIGNED_DATA) {
+ pr_debug("Signature certificate type is not PKCS\n");
+ return -ENOTSUPP;
+ }
+
+ /* Looks like actual pkcs signature length is in wrapper->length.
+ * size obtained from data dir entries lists the total size of
+ * certificate table which is also aligned to octawrod boundary.
+ *
+ * So set signature length field appropriately.
+ */
+ ctx->sig_len = wrapper.length;
+ ctx->sig_offset += sizeof(wrapper);
+ ctx->sig_len -= sizeof(wrapper);
+ if (ctx->sig_len == 0) {
+ pr_debug("Signature data missing\n");
+ return -EKEYREJECTED;
+ }
+
+ /* What's left should a PKCS#7 cert */
+ pkcs7 = pebuf + ctx->sig_offset;
+ if (pkcs7[0] == (ASN1_CONS_BIT | ASN1_SEQ)) {
+ if (pkcs7[1] == 0x82 &&
+ pkcs7[2] == (((ctx->sig_len - 4) >> 8) & 0xff) &&
+ pkcs7[3] == ((ctx->sig_len - 4) & 0xff))
+ return 0;
+ if (pkcs7[1] == 0x80)
+ return 0;
+ if (pkcs7[1] > 0x82)
+ return -EMSGSIZE;
+ }
+
+ pr_debug("Signature data not PKCS#7\n");
+ return -ELIBBAD;
+}
+
/**
* verify_pefile_signature - Verify the signature on a PE binary image
* @pebuf: Buffer containing the PE binary image
@@ -159,5 +226,9 @@ int verify_pefile_signature(const void *pebuf, unsigned pelen,
if (ret < 0)
return ret;

+ ret = pefile_strip_sig_wrapper(pebuf, &ctx);
+ if (ret < 0)
+ return ret;
+
return -ENOANO; // Not yet complete
}


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