s390-tools/s390-tools-sles15sp2-13-zkey-Cross-check-APQNs-when-changing-APQN-associatio.patch

Subject: zkey: Cross check APQNs when changing APQN associations
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: 0b4cbf00412f27456d28ff7f86ec5335a39e3416
Problem-ID:  SEC1916

Upstream-Description:

             zkey: Cross check APQNs when changing APQN associations

             Perform a cross check of the APQNs when the APQN association of a
             secure AES key in the key repository is changed. When adding new APQNs,
             or associating a new set of APQNs to a secure key, then the APQNs are
             cross checked. If all associated APQNs are removed, then all currently
             available APQNs are cross checked. If a master key mismatch is detected,
             then the change 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 |   31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

--- a/zkey/keystore.c
+++ b/zkey/keystore.c
@@ -1886,7 +1886,11 @@ int keystore_change_key(struct keystore
 					 .nomsg = 0 };
 	struct key_filenames file_names = { NULL, NULL, NULL };
 	struct properties *key_props = NULL;
+	size_t secure_key_size;
+	char *apqns_prop;
+	u8 *secure_key;
 	char temp[30];
+	u64 mkvp;
 	int rc;
 
 	util_assert(keystore != NULL, "Internal error: keystore is NULL");
@@ -1932,6 +1936,33 @@ int keystore_change_key(struct keystore
 						  &apqn_check);
 		if (rc != 0)
 			goto out;
+
+		secure_key = read_secure_key(file_names.skey_filename,
+					     &secure_key_size,
+					     keystore->verbose);
+		if (secure_key == NULL) {
+			rc = -ENOENT;
+			goto out;
+		}
+
+		rc = get_master_key_verification_pattern(secure_key,
+							 secure_key_size,
+							 &mkvp,
+							 keystore->verbose);
+		free(secure_key);
+		if (rc)
+			goto out;
+
+		apqns_prop = properties_get(key_props, PROP_NAME_APQNS);
+		rc = cross_check_apqns(apqns_prop, mkvp, true,
+				       keystore->verbose);
+		free(apqns_prop);
+		if (rc == -ENOTSUP)
+			rc = 0;
+		if (rc != 0 && noapqncheck == 0) {
+			warnx("Your master key setup is improper");
+			goto out;
+		}
 	}
 
 	if (sector_size >= 0) {