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scd:p15: Make $SIGNKEY et al determination more fault tolerant.

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* scd/app-p15.c (do_getattr): Change how we use gpgUsage to figure out
the keys to use.
This commit is contained in:
Werner Koch 2021-03-24 11:41:57 +01:00
parent c56926f773
commit 964363e788
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
1 changed files with 21 additions and 16 deletions
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37
scd/app-p15.c
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@ -4118,10 +4118,10 @@ do_getattr (app_t app, ctrl_t ctrl, const char *name)
char *buf;
/* We return the ID of the first private key capable of the
* requested action. IF any gpgusage flag has been set for the
* card we use the key only if both the P15 usage and the
* gpgusage are set. This allows allows to single out the keys
* dedicated to OpenPGP. */
* requested action. If any gpgusage flag has been set for the
* card we consult the gpgusage flags and not the regualr usage
* flags.
*/
/* FIXME: This changed: Note that we do not yet return
* non_repudiation keys for $SIGNKEYID because our D-Trust
* testcard uses rsaPSS, which is not supported by gpgsm and not
@ -4129,18 +4129,23 @@ do_getattr (app_t app, ctrl_t ctrl, const char *name)
for (prkdf = app->app_local->private_key_info; prkdf;
prkdf = prkdf->next)
{
if (name[1] == 'A' && (prkdf->usageflags.sign
|| prkdf->usageflags.sign_recover)
&& (!app->app_local->any_gpgusage || prkdf->gpgusage.auth))
break;
else if (name[1] == 'E' && (prkdf->usageflags.decrypt
|| prkdf->usageflags.unwrap)
&& (!app->app_local->any_gpgusage || prkdf->gpgusage.encr))
break;
else if (name[1] == 'S' && (prkdf->usageflags.sign
|| prkdf->usageflags.sign_recover)
&& (!app->app_local->any_gpgusage || prkdf->gpgusage.sign))
break;
if (app->app_local->any_gpgusage)
{
if ((name[1] == 'A' && prkdf->gpgusage.auth)
|| (name[1] == 'E' && prkdf->gpgusage.encr)
|| (name[1] == 'S' && prkdf->gpgusage.sign))
break;
}
else
{
if ((name[1] == 'A' && (prkdf->usageflags.sign
|| prkdf->usageflags.sign_recover))
|| (name[1] == 'E' && (prkdf->usageflags.decrypt
|| prkdf->usageflags.unwrap))
|| (name[1] == 'S' && (prkdf->usageflags.sign
|| prkdf->usageflags.sign_recover)))
break;
}
}
if (prkdf)
{