[Bug 2003701] Re: PKCS7: Message signed outside of X.509 validity window

[Dimitri John Ledkov]

setting PKCS7_NOATTR is not enough, as that only removes the smime
capabilities signed attribute, whilst signature timestamp remains.

--- ./regular.text	2023-01-23 11:42:49.992929526 +0000
+++ noattr.text	2023-01-23 11:42:59.288981639 +0000
@@ -128,7 +128,7 @@
 
             object: signingTime (1.2.840.113549.1.9.5)
             set:
-              UTCTIME:Jan 23 11:41:20 2023 GMT
+              UTCTIME:Jan 23 11:41:53 2023 GMT
 
             object: messageDigest (1.2.840.113549.1.9.4)
             set:
@@ -136,56 +136,32 @@
                 0000 - f8 cf 89 70 c1 6c 14 26-6d 56 c1 25 96   ...p.l.&mV.%.
                 000d - ce 74 11 77 a0 36 47 4d-3b 28 bf 7f 5b   .t.w.6GM;(..[
                 001a - 1e b6 04 ed 21 f8                        ....!.
-
-            object: S/MIME Capabilities (1.2.840.113549.1.9.15)
-            set:
-              SEQUENCE:
-    0:d=0  hl=2 l= 106 cons: SEQUENCE          
-    2:d=1  hl=2 l=  11 cons:  SEQUENCE          
-    4:d=2  hl=2 l=   9 prim:   OBJECT            :aes-256-cbc
-   15:d=1  hl=2 l=  11 cons:  SEQUENCE          
-   17:d=2  hl=2 l=   9 prim:   OBJECT            :aes-192-cbc
-   28:d=1  hl=2 l=  11 cons:  SEQUENCE          
-   30:d=2  hl=2 l=   9 prim:   OBJECT            :aes-128-cbc
-   41:d=1  hl=2 l=  10 cons:  SEQUENCE          
-   43:d=2  hl=2 l=   8 prim:   OBJECT            :des-ede3-cbc
-   53:d=1  hl=2 l=  14 cons:  SEQUENCE          
-   55:d=2  hl=2 l=   8 prim:   OBJECT            :rc2-cbc
-   65:d=2  hl=2 l=   2 prim:   INTEGER           :80
-   69:d=1  hl=2 l=  13 cons:  SEQUENCE          
-   71:d=2  hl=2 l=   8 prim:   OBJECT            :rc2-cbc
-   81:d=2  hl=2 l=   1 prim:   INTEGER           :40
-   84:d=1  hl=2 l=   7 cons:  SEQUENCE          
-   86:d=2  hl=2 l=   5 prim:   OBJECT            :des-cbc
-   93:d=1  hl=2 l=  13 cons:  SEQUENCE          
-   95:d=2  hl=2 l=   8 prim:   OBJECT            :rc2-cbc
-  105:d=2  hl=2 l=   1 prim:   INTEGER           :28
         digest_enc_alg: 


** Description changed:

  When signing UEFI applications, the signature includes signing
  timestamp.
  
  Kernels, upon kexec, check that message signature is within the validity
  of the X.509 signing certificate.
  
  When using original canonical kernel team test key, I no longer can
  kexec kernels, as the test key has expired.
  
  UEFI specifications in general ignore signing time.
  
  IMHO we should remove / not include signing timestamp in the UEFI
  signatures to avoid this.
+ 
+ ---
+ 
+ i guess openssl needs to provide ability to create signatures without
+ signingtime attribute.

** Also affects: openssl (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2003701

Title:
  PKCS7: Message signed outside of X.509 validity window

Status in openssl package in Ubuntu:
  New
Status in sbsigntool package in Ubuntu:
  New

Bug description:
  When signing UEFI applications, the signature includes signing
  timestamp.

  Kernels, upon kexec, check that message signature is within the
  validity of the X.509 signing certificate.

  When using original canonical kernel team test key, I no longer can
  kexec kernels, as the test key has expired.

  UEFI specifications in general ignore signing time.

  IMHO we should remove / not include signing timestamp in the UEFI
  signatures to avoid this.

  ---

  i guess openssl needs to provide ability to create signatures without
  signingtime attribute.

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