[Spice-devel] [PATCH libcacard v2 20/35] vcard_emul: New function vcard_emul_read_object()

[Jakub Jelen]

 * This function is used to read generic data objects presented by
   the underlying card, if available. It can provide some structures
   that we are not able to emulate in softeare card.

Signed-off-by: Jakub Jelen <jjelen at redhat.com>
Reviewed-by: Robert Relyea <rrelyea at redhat.com>
---
 docs/libcacard.txt   |  8 +++++++
 src/libcacard.syms   |  1 +
 src/vcard_emul.h     |  4 ++++
 src/vcard_emul_nss.c | 53 ++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 66 insertions(+)

diff --git a/docs/libcacard.txt b/docs/libcacard.txt
index 324dcb8..f421054 100644
--- a/docs/libcacard.txt
+++ b/docs/libcacard.txt
@@ -354,6 +354,14 @@ and applet.
 
      This function returns the size of RSA key in bits.
 
+         unsigned char *vcard_emul_read_object(VCard *card,
+                                               const unsigned char *label,
+                                               unsigned int *ret_len);
+
+     This function reads generic data from underlying smart card by the label,
+     if avaialble.
+
+
 The sample card type emulator is found in cac.c. It implements the cac specific
 applets.  Only those applets needed by the coolkey pkcs#11 driver on the guest
 have been implemented. To support the full range CAC middleware, a complete CAC
diff --git a/src/libcacard.syms b/src/libcacard.syms
index 04c0f89..b073fb8 100644
--- a/src/libcacard.syms
+++ b/src/libcacard.syms
@@ -21,6 +21,7 @@ vcard_emul_rsa_bits
 vcard_emul_type_from_string
 vcard_emul_type_select
 vcard_emul_usage
+vcard_emul_read_object
 vcard_find_applet
 vcard_free
 vcard_get_atr
diff --git a/src/vcard_emul.h b/src/vcard_emul.h
index ec64605..cb7fcbb 100644
--- a/src/vcard_emul.h
+++ b/src/vcard_emul.h
@@ -64,4 +64,8 @@ VCardEmulOptions *vcard_emul_options(const char *args);
 VCardEmulError vcard_emul_init(const VCardEmulOptions *options);
 void vcard_emul_replay_insertion_events(void);
 void vcard_emul_usage(void);
+
+unsigned char *vcard_emul_read_object(VCard *card, const char *label,
+                                      unsigned int *ret_len);
+
 #endif
diff --git a/src/vcard_emul_nss.c b/src/vcard_emul_nss.c
index e213d7f..e02426b 100644
--- a/src/vcard_emul_nss.c
+++ b/src/vcard_emul_nss.c
@@ -1327,6 +1327,59 @@ vcard_emul_options(const char *args)
     return opts;
 }
 
+unsigned char *
+vcard_emul_read_object(VCard *card, const char *label,
+    unsigned int *ret_len)
+{
+    PK11SlotInfo *slot;
+    PK11GenericObject *obj, *firstObj, *myObj = NULL;
+    SECItem result;
+    SECStatus r;
+
+    slot = vcard_emul_card_get_slot(card);
+
+    firstObj = PK11_FindGenericObjects(slot, CKO_DATA);
+    fprintf(stderr, "%s: Search for generic objects: got %p", __func__, firstObj);
+    for (obj = firstObj; obj; obj = PK11_GetNextGenericObject(obj)) {
+        int found = 0;
+        r = PK11_ReadRawAttribute(PK11_TypeGeneric, obj,
+            CKA_LABEL, &result);
+        if (r != SECSuccess) {
+            PK11_DestroyGenericObjects(firstObj);
+            return NULL;
+        }
+
+        if (strlen(label) == result.len
+            && memcmp(label, result.data, result.len) == 0)
+            found = 1;
+
+        free(result.data);
+        result.data = NULL;
+
+        if (found) {
+            if (obj == firstObj)
+                firstObj = obj;
+            PK11_UnlinkGenericObject(obj);
+            myObj = obj;
+            break;
+        }
+    }
+    PK11_DestroyGenericObjects(firstObj);
+
+    if (!myObj)
+        return NULL;
+
+    r = PK11_ReadRawAttribute(PK11_TypeGeneric, myObj,
+        CKA_VALUE, &result);
+    PK11_DestroyGenericObject(myObj);
+    if (r != SECSuccess)
+        return NULL;
+
+    *ret_len = result.len;
+    return result.data;
+
+}
+
 void
 vcard_emul_usage(void)
 {
-- 
2.17.1