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-rw-r--r--src/home/homework-pkcs11.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/src/home/homework-pkcs11.c b/src/home/homework-pkcs11.c
new file mode 100644
index 0000000..f371994
--- /dev/null
+++ b/src/home/homework-pkcs11.c
@@ -0,0 +1,102 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "hexdecoct.h"
+#include "homework-pkcs11.h"
+#include "pkcs11-util.h"
+#include "strv.h"
+
+int pkcs11_callback(
+ CK_FUNCTION_LIST *m,
+ CK_SESSION_HANDLE session,
+ CK_SLOT_ID slot_id,
+ const CK_SLOT_INFO *slot_info,
+ const CK_TOKEN_INFO *token_info,
+ P11KitUri *uri,
+ void *userdata) {
+
+ _cleanup_(erase_and_freep) void *decrypted_key = NULL;
+ struct pkcs11_callback_data *data = ASSERT_PTR(userdata);
+ _cleanup_free_ char *token_label = NULL;
+ CK_TOKEN_INFO updated_token_info;
+ size_t decrypted_key_size;
+ CK_OBJECT_HANDLE object;
+ CK_RV rv;
+ int r;
+
+ assert(m);
+ assert(slot_info);
+ assert(token_info);
+ assert(uri);
+
+ /* Special return values:
+ *
+ * -ENOANO → if we need a PIN but have none
+ * -ERFKILL → if a "protected authentication path" is needed but we have no OK to use it
+ * -EOWNERDEAD → if the PIN is locked
+ * -ENOLCK → if the supplied PIN is incorrect
+ * -ETOOMANYREFS → ditto, but only a few tries left
+ * -EUCLEAN → ditto, but only a single try left
+ */
+
+ token_label = pkcs11_token_label(token_info);
+ if (!token_label)
+ return log_oom();
+
+ if (FLAGS_SET(token_info->flags, CKF_PROTECTED_AUTHENTICATION_PATH)) {
+
+ if (data->secret->pkcs11_protected_authentication_path_permitted <= 0)
+ return log_error_errno(SYNTHETIC_ERRNO(ERFKILL), "Security token requires authentication through protected authentication path.");
+
+ rv = m->C_Login(session, CKU_USER, NULL, 0);
+ if (rv != CKR_OK)
+ return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to log into security token '%s': %s", token_label, sym_p11_kit_strerror(rv));
+
+ log_info("Successfully logged into security token '%s' via protected authentication path.", token_label);
+ goto decrypt;
+ }
+
+ if (!FLAGS_SET(token_info->flags, CKF_LOGIN_REQUIRED)) {
+ log_info("No login into security token '%s' required.", token_label);
+ goto decrypt;
+ }
+
+ if (strv_isempty(data->secret->token_pin))
+ return log_error_errno(SYNTHETIC_ERRNO(ENOANO), "Security token requires PIN.");
+
+ STRV_FOREACH(i, data->secret->token_pin) {
+ rv = m->C_Login(session, CKU_USER, (CK_UTF8CHAR*) *i, strlen(*i));
+ if (rv == CKR_OK) {
+ log_info("Successfully logged into security token '%s' with PIN.", token_label);
+ goto decrypt;
+ }
+ if (rv == CKR_PIN_LOCKED)
+ return log_error_errno(SYNTHETIC_ERRNO(EOWNERDEAD), "PIN of security token is blocked. Please unblock it first.");
+ if (!IN_SET(rv, CKR_PIN_INCORRECT, CKR_PIN_LEN_RANGE))
+ return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to log into security token '%s': %s", token_label, sym_p11_kit_strerror(rv));
+ }
+
+ rv = m->C_GetTokenInfo(slot_id, &updated_token_info);
+ if (rv != CKR_OK)
+ return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to acquire updated security token information for slot %lu: %s", slot_id, sym_p11_kit_strerror(rv));
+
+ if (FLAGS_SET(updated_token_info.flags, CKF_USER_PIN_FINAL_TRY))
+ return log_error_errno(SYNTHETIC_ERRNO(EUCLEAN), "PIN of security token incorrect, only a single try left.");
+ if (FLAGS_SET(updated_token_info.flags, CKF_USER_PIN_COUNT_LOW))
+ return log_error_errno(SYNTHETIC_ERRNO(ETOOMANYREFS), "PIN of security token incorrect, only a few tries left.");
+
+ return log_error_errno(SYNTHETIC_ERRNO(ENOLCK), "PIN of security token incorrect.");
+
+decrypt:
+ r = pkcs11_token_find_private_key(m, session, uri, &object);
+ if (r < 0)
+ return r;
+
+ r = pkcs11_token_decrypt_data(m, session, object, data->encrypted_key->data, data->encrypted_key->size, &decrypted_key, &decrypted_key_size);
+ if (r < 0)
+ return r;
+
+ if (base64mem(decrypted_key, decrypted_key_size, &data->decrypted_password) < 0)
+ return log_oom();
+
+ return 1;
+}