s390-tools/s390-tools-sles15sp2-12-zkey-Cross-check-APQNs-when-importing-secure-keys.patch

Subject: zkey: Cross check APQNs when importing secure keys
From: Ingo Franzki <ifranzki@linux.ibm.com>

Summary:     zkey: check master key consistency
Description: Enhances the zkey tool to perform a cross check whether the
             APQNs associated with a secure key have the same master key.
             Display the master key verification pattern of a secure key
             during the zkey validate command. This helps to better identify
             which master key is the correct one, in case of master key 
             inconsistencies.
             Select an appropriate APQN when re-enciphering a secure key.
             Re-enciphering is done using the CCA host library. Special
             handling is required to select an appropriate APQN for use with
             the CCA host library.
Upstream-ID: d854aed4b8154e7420def8749db2106a049dd80a
Problem-ID:  SEC1916

Upstream-Description:

             zkey: Cross check APQNs when importing secure keys

             Perform a cross check of the APQNs when an existing secure AES key is
             imported into the key repository. When a set of APQNs are associated to
             the imported secure key, these APQNs are cross checked. If no APQNs are
             associated to imported secure key, then all currently available
             APQNs are cross checked. If a master key mismatch is detected, then
             the key import is rejected.

             Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
             Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
             Signed-off-by: Jan Hoeppner <hoeppner@linux.ibm.com>


Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
---
 zkey/keystore.c |   21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

--- a/zkey/keystore.c
+++ b/zkey/keystore.c
@@ -1770,6 +1770,7 @@ int keystore_import_key(struct keystore
 	struct properties *key_props = NULL;
 	size_t secure_key_size;
 	u8 *secure_key;
+	u64 mkvp;
 	int rc;
 
 	util_assert(keystore != NULL, "Internal error: keystore is NULL");
@@ -1791,9 +1792,26 @@ int keystore_import_key(struct keystore
 		goto out_free_key_filenames;
 	}
 
+	rc = get_master_key_verification_pattern(secure_key, secure_key_size,
+						 &mkvp, keystore->verbose);
+	if (rc != 0) {
+		warnx("Failed to get the master key verification pattern: %s",
+		      strerror(-rc));
+		goto out_free_key;
+	}
+
+	rc = cross_check_apqns(apqns, mkvp, true, keystore->verbose);
+	if (rc == -EINVAL)
+		goto out_free_key;
+	if (rc != 0 && rc != -ENOTSUP && noapqncheck == 0) {
+		warnx("Your master key setup is improper");
+		goto out_free_key;
+	}
+
 	rc = write_secure_key(file_names.skey_filename, secure_key,
 			      secure_key_size, keystore->verbose);
 	free(secure_key);
+	secure_key = NULL;
 	if (rc != 0)
 		goto out_free_props;
 
@@ -1811,6 +1829,9 @@ int keystore_import_key(struct keystore
 		   "Successfully imported a secure key in '%s' and key info in '%s'",
 		   file_names.skey_filename, file_names.info_filename);
 
+out_free_key:
+	if (secure_key != NULL)
+		free(secure_key);
 out_free_props:
 	if (key_props != NULL)
 		properties_free(key_props);