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agent: Update the key file only if changed (slight return).

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* agent/findkey.c (read_key_file): Add optional arg r_orig_key_value
to return the old Key value.  Change all callers.
(agent_write_private_key): Detect whether the Key entry was really
changed.
--

GnuPG-bug-id: 6829
This commit is contained in:
Werner Koch 2023-11-21 12:13:50 +01:00
parent 813bb65d95
commit 09329d52b5
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
1 changed files with 52 additions and 12 deletions
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64
agent/findkey.c
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@ -41,7 +41,8 @@
static gpg_error_t read_key_file (const unsigned char *grip,
gcry_sexp_t *result, nvc_t *r_keymeta);
gcry_sexp_t *result, nvc_t *r_keymeta,
char **r_orig_key_value);
static gpg_error_t is_shadowed_key (gcry_sexp_t s_skey);
@ -129,12 +130,15 @@ agent_write_private_key (const unsigned char *grip,
char **tokenfields = NULL;
int is_regular;
int blocksigs = 0;
char *orig_key_value = NULL;
const char *s;
int force_modify = 0;
fname = fname_from_keygrip (grip, 0);
if (!fname)
return gpg_error_from_syserror ();
err = read_key_file (grip, &key, &pk);
err = read_key_file (grip, &key, &pk, &orig_key_value);
if (err)
{
if (gpg_err_code (err) == GPG_ERR_ENOENT)
@ -158,6 +162,7 @@ agent_write_private_key (const unsigned char *grip,
err = gpg_error_from_syserror ();
goto leave;
}
force_modify = 1;
}
/* Check whether we already have a regular key. */
@ -173,6 +178,19 @@ agent_write_private_key (const unsigned char *grip,
if (err)
goto leave;
/* Detect whether the key value actually changed and if not clear
* the modified flag. This extra check is required because
* read_key_file removes the Key entry from the container and we
* then create a new Key entry which might be the same, though. */
if (!force_modify
&& orig_key_value && (s = nvc_get_string (pk, "Key:"))
&& !strcmp (orig_key_value, s))
{
nvc_modified (pk, 1); /* Clear that flag. */
}
xfree (orig_key_value);
orig_key_value = NULL;
/* Check that we do not update a regular key with a shadow key. */
if (is_regular && gpg_err_code (is_shadowed_key (key)) == GPG_ERR_TRUE)
{
@ -194,7 +212,6 @@ agent_write_private_key (const unsigned char *grip,
if (serialno && keyref)
{
nve_t item;
const char *s;
size_t token0len;
if (dispserialno)
@ -319,6 +336,7 @@ agent_write_private_key (const unsigned char *grip,
es_fclose (fp);
if (removetmp && tmpfname)
gnupg_remove (tmpfname);
xfree (orig_key_value);
xfree (fname);
xfree (tmpfname);
xfree (token);
@ -865,10 +883,13 @@ unprotect (ctrl_t ctrl, const char *cache_nonce, const char *desc_text,
* return it as an gcrypt S-expression object in RESULT. If R_KEYMETA
* is not NULL and the extended key format is used, the meta data
* items are stored there. However the "Key:" item is removed from
* it. On failure returns an error code and stores NULL at RESULT and
* R_KEYMETA. */
* it. If R_ORIG_KEY_VALUE is non-NULL and the Key item was removed,
* its original value is stored at that R_ORIG_KEY_VALUE and the
* caller must free it. On failure returns an error code and stores
* NULL at RESULT and R_KEYMETA. */
static gpg_error_t
read_key_file (const unsigned char *grip, gcry_sexp_t *result, nvc_t *r_keymeta)
read_key_file (const unsigned char *grip, gcry_sexp_t *result, nvc_t *r_keymeta,
char **r_orig_key_value)
{
gpg_error_t err;
char *fname;
@ -882,6 +903,8 @@ read_key_file (const unsigned char *grip, gcry_sexp_t *result, nvc_t *r_keymeta)
*result = NULL;
if (r_keymeta)
*r_keymeta = NULL;
if (r_orig_key_value)
*r_orig_key_value = NULL;
fname = fname_from_keygrip (grip, 0);
if (!fname)
@ -936,7 +959,24 @@ read_key_file (const unsigned char *grip, gcry_sexp_t *result, nvc_t *r_keymeta)
log_error ("error getting private key from '%s': %s\n",
fname, gpg_strerror (err));
else
nvc_delete_named (pk, "Key:");
{
if (r_orig_key_value)
{
const char *s = nvc_get_string (pk, "Key:");
if (s)
{
*r_orig_key_value = xtrystrdup (s);
if (!*r_orig_key_value)
{
err = gpg_error_from_syserror ();
nvc_release (pk);
xfree (fname);
return err;
}
}
}
nvc_delete_named (pk, "Key:");
}
}
if (!err && r_keymeta)
@ -1186,7 +1226,7 @@ agent_key_from_file (ctrl_t ctrl, const char *cache_nonce,
if (!grip && !ctrl->have_keygrip)
return gpg_error (GPG_ERR_NO_SECKEY);
err = read_key_file (grip? grip : ctrl->keygrip, &s_skey, &keymeta);
err = read_key_file (grip? grip : ctrl->keygrip, &s_skey, &keymeta, NULL);
if (err)
{
if (gpg_err_code (err) == GPG_ERR_ENOENT)
@ -1445,7 +1485,7 @@ agent_raw_key_from_file (ctrl_t ctrl, const unsigned char *grip,
*result = NULL;
err = read_key_file (grip, &s_skey, r_keymeta);
err = read_key_file (grip, &s_skey, r_keymeta, NULL);
if (!err)
*result = s_skey;
return err;
@ -1488,7 +1528,7 @@ public_key_from_file (ctrl_t ctrl, const unsigned char *grip,
if (r_sshorder)
*r_sshorder = 0;
err = read_key_file (grip, &s_skey, for_ssh? &keymeta : NULL);
err = read_key_file (grip, &s_skey, for_ssh? &keymeta : NULL, NULL);
if (err)
return err;
@ -1660,7 +1700,7 @@ agent_key_info_from_file (ctrl_t ctrl, const unsigned char *grip,
{
gcry_sexp_t sexp;
err = read_key_file (grip, &sexp, NULL);
err = read_key_file (grip, &sexp, NULL, NULL);
if (err)
{
if (gpg_err_code (err) == GPG_ERR_ENOENT)
@ -1744,7 +1784,7 @@ agent_delete_key (ctrl_t ctrl, const char *desc_text,
char *default_desc = NULL;
int key_type;
err = read_key_file (grip, &s_skey, NULL);
err = read_key_file (grip, &s_skey, NULL, NULL);
if (gpg_err_code (err) == GPG_ERR_ENOENT)
err = gpg_error (GPG_ERR_NO_SECKEY);
if (err)