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gpg: Improve decryption diagnostic for an ADSK key.

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* g10/keydb.h (GET_PUBKEYBLOCK_FLAG_ADSK): New constant.
* g10/packet.h (PUBKEY_USAGE_XENC_MASK): New constant.
* g10/pubkey-enc.c (get_it): Print a note if an ADSK key was used.
Use the new get_pubkeyblock flag.
* g10/getkey.c (struct getkey_ctx_s): Add field allow_adsk.
(get_pubkeyblock): Factor all code out to ...
(get_pubkeyblock_ext): new.
(finish_lookup): Add new arg allow_adsk and make use of it.
--

This patch solves two purposes:
- We write a note that the ADSK key was used for decryption
- We avoid running into a
  "oops: public key not found for preference check\n"
  due to ADSK keys.  The error is mostly harmless but lets gpg return
  with an exit code of 2.

Backported-from-master: 882ab7fef9
This commit is contained in:
Werner Koch 2024-08-12 14:50:08 +02:00
parent 6f78219d0f
commit 861dc01994
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
4 changed files with 37 additions and 8 deletions
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4
g10/packet.h
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@ -60,10 +60,14 @@
#define PUBKEY_USAGE_RENC 1024 /* Restricted encryption. */
#define PUBKEY_USAGE_TIME 2048 /* Timestamp use. */
/* The usage bits which can be derived from the algo. */
#define PUBKEY_USAGE_BASIC_MASK (PUBKEY_USAGE_SIG|PUBKEY_USAGE_ENC\
|PUBKEY_USAGE_CERT|PUBKEY_USAGE_AUTH)
/* The usage bits which define encryption. */
#define PUBKEY_USAGE_XENC_MASK (PUBKEY_USAGE_ENC | PUBKEY_USAGE_RENC)
/* Helper macros. */
#define is_RSA(a) ((a)==PUBKEY_ALGO_RSA || (a)==PUBKEY_ALGO_RSA_E \