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scd:p15: Handle duplicate certificate ids.

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* scd/app-p15.c (struct app_local_s): Add field cdf_dup_counter.
(objid_in_cdflist_p): New.
(read_p15_info): Clear the counter.
(read_ef_cdf): Detect and fix duplicate IDs.
--

GnuPG-bug-id: 7001
Reported-by: Mario Haustein <mario.haustein@hrz.tu-chemnitz.de>
This commit is contained in:
Werner Koch 2024-02-19 16:50:22 +01:00
parent ad4bc3e04d
commit 3341017ff1
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
1 changed files with 44 additions and 2 deletions
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46
scd/app-p15.c
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@ -520,6 +520,9 @@ struct app_local_s
/* Information on all useful certificates. */
cdf_object_t useful_certificate_info;
/* Counter to make object ids of certificates unique. */
unsigned int cdf_dup_counter;
/* Information on all public keys. */
prkdf_object_t public_key_info;
@ -2419,6 +2422,22 @@ read_ef_pukdf (app_t app, unsigned short fid, pukdf_object_t *result)
}
/* Return true id CDFLIST has the given object id. */
static int
objid_in_cdflist_p (cdf_object_t cdflist,
const unsigned char *objid, size_t objidlen)
{
cdf_object_t cdf;
if (!objid || !objidlen)
return 0;
for (cdf = cdflist; cdf; cdf = cdf->next)
if (cdf->objidlen == objidlen && !memcmp (cdf->objid, objid, objidlen))
return 1;
return 0;
}
/* Read and parse the Certificate Directory Files identified by FID.
On success a newlist of CDF object gets stored at RESULT and the
caller is then responsible of releasing this list. On error a
@ -2464,6 +2483,7 @@ read_ef_cdf (app_t app, unsigned short fid, int cdftype, cdf_object_t *result)
unsigned long ul;
const unsigned char *objid;
size_t objidlen;
int objidextralen;
err = parse_ber_header (&p, &n, &class, &tag, &constructed,
&ndef, &objlen, &hdrlen);
@ -2588,8 +2608,19 @@ read_ef_cdf (app_t app, unsigned short fid, int cdftype, cdf_object_t *result)
label = NULL;
}
cdf->objidlen = objidlen;
cdf->objid = xtrymalloc (objidlen);
/* Card's have been found in the wild which do not have unique
* IDs for their certificate objects. If we detect this we
* append a counter to the ID. */
objidextralen =
(objid_in_cdflist_p (cdflist, objid, objidlen)
|| objid_in_cdflist_p (app->app_local->certificate_info,
objid, objidlen)
|| objid_in_cdflist_p (app->app_local->trusted_certificate_info,
objid, objidlen)
|| objid_in_cdflist_p (app->app_local->useful_certificate_info,
objid, objidlen));
cdf->objidlen = objidlen + objidextralen;
cdf->objid = xtrymalloc (objidlen + objidextralen);
if (!cdf->objid)
{
err = gpg_error_from_syserror ();
@ -2597,6 +2628,16 @@ read_ef_cdf (app_t app, unsigned short fid, int cdftype, cdf_object_t *result)
goto leave;
}
memcpy (cdf->objid, objid, objidlen);
if (objidextralen)
{
if (app->app_local->cdf_dup_counter == 255)
{
log_error ("p15: too many duplicate certificate ids\n");
err = gpg_error (GPG_ERR_TOO_MANY);
goto parse_error;
}
cdf->objid[objidlen] = ++app->app_local->cdf_dup_counter;
}
cdf->pathlen = objlen/2;
for (i=0; i < cdf->pathlen; i++, pp += 2, nn -= 2)
@ -3664,6 +3705,7 @@ read_p15_info (app_t app)
log_assert (!app->app_local->certificate_info);
log_assert (!app->app_local->trusted_certificate_info);
log_assert (!app->app_local->useful_certificate_info);
app->app_local->cdf_dup_counter = 0;
err = read_ef_cdf (app, app->app_local->odf.certificates, 'c',
&app->app_local->certificate_info);
if (!err || gpg_err_code (err) == GPG_ERR_NO_DATA)