PKCS#7: Handle PKCS#7 messages that contain no X.509 certs

The X.509 certificate list in a PKCS#7 message is optional.  To save space, we
can omit the inclusion of any X.509 certificates if we are sure that we can
look the relevant public key up by the serial number and issuer given in a
signed info block.

This also supports use of a signed info block for which we can't find a
matching X.509 cert in the certificate list, though it be populated.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>

diff --git a/crypto/asymmetric_keys/pkcs7_trust.c b/crypto/asymmetric_keys/pkcs7_trust.c
index 8bd474e5e706835e893c22ac57d1bc7db1b1d2f9..ae47be6128c411f6fc3c3f44e729a14218c9b55c 100644 (file)
--- a/crypto/asymmetric_keys/pkcs7_trust.c
+++ b/crypto/asymmetric_keys/pkcs7_trust.c
@@ -55,13 +55,16 @@ static int pkcs7_validate_trust_one(struct pkcs7_message *pkcs7,
                 * keys.
                 */
                key = x509_request_asymmetric_key(trust_keyring, x509->id);
-               if (!IS_ERR(key))
+               if (!IS_ERR(key)) {
                        /* One of the X.509 certificates in the PKCS#7 message
                         * is apparently the same as one we already trust.
                         * Verify that the trusted variant can also validate
                         * the signature on the descendant.
                         */
+                       pr_devel("sinfo %u: Cert %u as key %x\n",
+                                sinfo->index, x509->index, key_serial(key));
                        goto matched;
+               }
                if (key == ERR_PTR(-ENOMEM))
                        return -ENOMEM;
 
@@ -81,15 +84,34 @@ static int pkcs7_validate_trust_one(struct pkcs7_message *pkcs7,
        /* No match - see if the root certificate has a signer amongst the
         * trusted keys.
         */
-       if (!last || !last->issuer || !last->authority) {
-               kleave(" = -ENOKEY [no backref]");
-               return -ENOKEY;
+       if (last && last->authority) {
+               key = x509_request_asymmetric_key(trust_keyring, last->authority);
+               if (!IS_ERR(key)) {
+                       x509 = last;
+                       pr_devel("sinfo %u: Root cert %u signer is key %x\n",
+                                sinfo->index, x509->index, key_serial(key));
+                       goto matched;
+               }
+               if (PTR_ERR(key) != -ENOKEY)
+                       return PTR_ERR(key);
        }
 
-       key = x509_request_asymmetric_key(trust_keyring, last->authority);
-       if (IS_ERR(key))
-               return PTR_ERR(key) == -ENOMEM ? -ENOMEM : -ENOKEY;
-       x509 = last;
+       /* As a last resort, see if we have a trusted public key that matches
+        * the signed info directly.
+        */
+       key = x509_request_asymmetric_key(trust_keyring,
+                                         sinfo->signing_cert_id);
+       if (!IS_ERR(key)) {
+               pr_devel("sinfo %u: Direct signer is key %x\n",
+                        sinfo->index, key_serial(key));
+               x509 = NULL;
+               goto matched;
+       }
+       if (PTR_ERR(key) != -ENOKEY)
+               return PTR_ERR(key);
+
+       kleave(" = -ENOKEY [no backref]");
+       return -ENOKEY;
 
 matched:
        ret = verify_signature(key, sig);
@@ -103,10 +125,12 @@ matched:
        }
 
 verified:
-       x509->verified = true;
-       for (p = sinfo->signer; p != x509; p = p->signer) {
-               p->verified = true;
-               p->trusted = trusted;
+       if (x509) {
+               x509->verified = true;
+               for (p = sinfo->signer; p != x509; p = p->signer) {
+                       p->verified = true;
+                       p->trusted = trusted;
+               }
        }
        sinfo->trusted = trusted;
        kleave(" = 0");

diff --git a/crypto/asymmetric_keys/pkcs7_verify.c b/crypto/asymmetric_keys/pkcs7_verify.c
index bd264052f7518cced2729c8909acc20333bc3c5d..cd455450b069e3c58d1a202484e3ccba2d5d7da1 100644 (file)
--- a/crypto/asymmetric_keys/pkcs7_verify.c
+++ b/crypto/asymmetric_keys/pkcs7_verify.c
@@ -154,10 +154,13 @@ static int pkcs7_find_key(struct pkcs7_message *pkcs7,
                return 0;
        }
 
-       pr_warn("Sig %u: Issuing X.509 cert not found (#%*ph)\n",
-               sinfo->index,
-               sinfo->signing_cert_id->len, sinfo->signing_cert_id->data);
-       return -ENOKEY;
+       /* The relevant X.509 cert isn't found here, but it might be found in
+        * the trust keyring.
+        */
+       pr_debug("Sig %u: Issuing X.509 cert not found (#%*phN)\n",
+                sinfo->index,
+                sinfo->signing_cert_id->len, sinfo->signing_cert_id->data);
+       return 0;
 }
 
 /*
@@ -275,11 +278,14 @@ static int pkcs7_verify_one(struct pkcs7_message *pkcs7,
        if (ret < 0)
                return ret;
 
-       /* Find the key for the signature */
+       /* Find the key for the signature if there is one */
        ret = pkcs7_find_key(pkcs7, sinfo);
        if (ret < 0)
                return ret;
 
+       if (!sinfo->signer)
+               return 0;
+
        pr_devel("Using X.509[%u] for sig %u\n",
                 sinfo->signer->index, sinfo->index);