security-and-privacy/gnupg
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agent: Update the key file only if not changed.

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* common/name-value.c (struct name_value_container): Add flag
"modified".
(nvc_modified): New.
(nvc_new): Set flag.
(_nvc_add): Set flag.
(nvc_delete): Set flag.
(nvc_set): Set flag unless value did not change.
(nve_set): Add arg PK.  Change the caller.
* agent/findkey.c (agent_write_private_key): Update only if modified.
--

This helps software which uses a file system watcher to track changes
to private keys.  In particular smartcard triggered changes are a
problem for such software because this may at worst trigger another
smartcard read.

GnuPG-bug-id: 6829
This commit is contained in:
Werner Koch 2023-11-21 08:34:04 +01:00
parent e43bd2a7a7
commit cf2d3f7ba0
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
3 changed files with 56 additions and 9 deletions
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7
common/name-value.h
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@ -50,6 +50,9 @@ nvc_t nvc_new_private_key (void);
/* Release a name value container structure. */
void nvc_release (nvc_t pk);
/* Return the modified flag and optionally clear it. */
int nvc_modified (nvc_t pk, int clear);
/* Get the name. */
char *nve_name (nve_t pke);
@ -92,8 +95,8 @@ gpg_error_t nvc_add (nvc_t pk, const char *name, const char *value);
first entry is updated. */
gpg_error_t nvc_set (nvc_t pk, const char *name, const char *value);
/* Update entry E to VALUE. */
gpg_error_t nve_set (nve_t e, const char *value);
/* Update entry E to VALUE. PK is optional. */
gpg_error_t nve_set (nvc_t pk, nve_t e, const char *value);
/* Delete the given entry from PK. */
void nvc_delete (nvc_t pk, nve_t pke);