tpm2-tools/0011-tpm2_encodeobject-fix-auth-boolean-flag.patch

From 579bb674b5bdf2a0d50e8d3a3d6f5391d233bdff Mon Sep 17 00:00:00 2001
From: William Roberts <william.c.roberts@intel.com>
Date: Mon, 24 Oct 2022 10:48:18 -0500
Subject: [PATCH 11/17] tpm2_encodeobject: fix auth boolean flag

The flag for wether or not a key needs a password was being set based on
if the parent needed a password or not when it should be set based on if
the child object needs a password or not.

Correct this by adding a -p/--key-auth option to indicate the value of
this boolean.

$ tpm2 encodeobject -C 0x81000000 -u key.pub -r key.priv -o key.pem
$ openssl asn1parse -dump -inform PEM -in key.pem
   <snip>
   14:d=2  hl=2 l=   1 prim: BOOLEAN           :0
   </snip>

$ tpm2 encodeobject -C 0x81000000 -u key.pub -r key.priv -o key.pem -p
$ openssl asn1parse -dump -inform PEM -in key.pem
   <snip>
   14:d=2  hl=2 l=   1 prim: BOOLEAN           :1
   </snip>

A workaround would be manually modifying the ASN1 PEM file boolean flag
OR creating the same parent key but with a password and specifying the
password via `-P`. Note that a primary key is the same given the same
inputs and password doesn't change the generated key.

Fixes: #3152

Signed-off-by: William Roberts <william.c.roberts@intel.com>
---
 man/tpm2_encodeobject.1.md     | 5 +++++
 tools/misc/tpm2_encodeobject.c | 9 +++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/man/tpm2_encodeobject.1.md b/man/tpm2_encodeobject.1.md
index 791eafbd..2e83fa7d 100644
--- a/man/tpm2_encodeobject.1.md
+++ b/man/tpm2_encodeobject.1.md
@@ -37,6 +37,11 @@ applications.
 
     A file containing the sensitive portion of the object.
 
+  * **-p**, **\--key-auth**:
+
+    Indicates if an authorization value is needed for the object specified by
+    **-r** and **-u**.
+
   * **-o**, **\--output**=_FILE_:
 
     The output file path, recording the public portion of the object.
diff --git a/tools/misc/tpm2_encodeobject.c b/tools/misc/tpm2_encodeobject.c
index ccbd0e01..80de14f5 100644
--- a/tools/misc/tpm2_encodeobject.c
+++ b/tools/misc/tpm2_encodeobject.c
@@ -65,6 +65,7 @@ struct tpm_encodeobject_ctx {
         const char *privpath;
         TPM2B_PRIVATE private;
         ESYS_TR handle;
+        bool needs_auth;
     } object;
 
     char *output_path;
@@ -89,6 +90,9 @@ static bool on_option(char key, char *value) {
     case 'o':
         ctx.output_path = value;
 	break;
+    case 'p':
+        ctx.object.needs_auth = true;
+        break;
     }
 
     return true;
@@ -101,9 +105,10 @@ static bool tpm2_tool_onstart(tpm2_options **opts) {
       { "private",        required_argument, NULL, 'r' },
       { "parent-context", required_argument, NULL, 'C' },
       { "output",         required_argument, NULL, 'o' },
+      { "key-auth",       no_argument,       NULL, 'p' },
     };
 
-    *opts = tpm2_options_new("P:u:r:C:o:", ARRAY_LEN(topts), topts, on_option,
+    *opts = tpm2_options_new("P:u:r:C:o:p", ARRAY_LEN(topts), topts, on_option,
             NULL, 0);
 
     return *opts != NULL;
@@ -190,7 +195,7 @@ encode(void)
         goto error;
     }
 
-    tpk->emptyAuth = ctx.parent.auth_str == NULL ? 0xFF : 0;
+    tpk->emptyAuth = ctx.object.needs_auth;
 
     if ((ctx.parent.object.handle >> TPM2_HR_SHIFT) == TPM2_HT_PERSISTENT) {
 	ASN1_INTEGER_set(tpk->parent, ctx.parent.object.handle);
-- 
2.40.1