147 lines
5.7 KiB
Diff
147 lines
5.7 KiB
Diff
diff --git a/lib/crypto.c b/lib/crypto.c
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index 4b9006a..5b562d1 100644
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--- a/lib/crypto.c
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+++ b/lib/crypto.c
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@@ -69,6 +69,115 @@ error_from_pr (GError **error)
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g_free (err);
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}
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+/*
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+ * FIPS compliant implementation of PK11_ImportSymKey().
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+ * Source: https://github.com/ceph/ceph/pull/27104/files
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+ */
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+static PK11SymKey *
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+import_sym_key (PK11SlotInfo *slot, CK_MECHANISM_TYPE type, PK11Origin origin,
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+ CK_ATTRIBUTE_TYPE operation, SECItem *key, void *wincx)
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+{
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+ CK_MECHANISM_TYPE wrap_mechanism = 0UL;
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+ PK11SymKey *wrapping_key = NULL, *sym_key = NULL;
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+ SECItem tmp_sec_item, wrapped_key_item, *raw_key_aligned = NULL;
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+ PK11Context *wrap_key_crypt_context = NULL;
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+ int block_size = 0;
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+ size_t wrapped_key_size = 0;
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+ unsigned char *wrapped_key = NULL;
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+ int out_len = 0;
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+ SECStatus ret = 0;
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+
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+ /* Fall back to PK11_ImportSymKey() if FIPS mode is disabled. */
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+ if (PK11_IsFIPS () == PR_FALSE)
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+ return PK11_ImportSymKey (slot, type, origin, operation, key, wincx);
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+
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+ /* Get the best mechanism for the wrapping operation. */
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+ wrap_mechanism = PK11_GetBestWrapMechanism (slot);
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+
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+ /* Based on that mechanism, generate a symetric key <wrapping_key>. */
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+ wrapping_key = PK11_KeyGen (slot, wrap_mechanism, NULL,
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+ PK11_GetBestKeyLength (slot, wrap_mechanism),
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+ NULL);
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+ if (wrapping_key == NULL)
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+ return NULL;
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+
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+ /* Create the context for the wrapping operation. The context contains:
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+ * - <wrapping_key>
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+ * - operation to perform (CKA_ENCRYPT)
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+ */
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+ memset (&tmp_sec_item, 0, sizeof (tmp_sec_item));
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+ wrap_key_crypt_context = PK11_CreateContextBySymKey (wrap_mechanism,
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+ CKA_ENCRYPT,
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+ wrapping_key,
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+ &tmp_sec_item);
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+ if (wrap_key_crypt_context == NULL) {
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+ PK11_FreeSymKey (wrapping_key);
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+ return NULL;
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+ }
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+
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+ /* Align <key> to the block size specified by the wrapping mechanism. */
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+ block_size = PK11_GetBlockSize (wrap_mechanism, NULL);
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+ raw_key_aligned = PK11_BlockData (key, block_size);
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+ if (raw_key_aligned == NULL) {
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+ PK11_DestroyContext (wrap_key_crypt_context, PR_TRUE);
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+ PK11_FreeSymKey (wrapping_key);
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+ return NULL;
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+ }
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+
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+ /* Prepare for <key> wrap. First, allocate enough space for
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+ * the wrapped <key>. Add the padding of the size of one block behind the
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+ * aligned <key> to make sure the wrapping operation will not hit the wall.
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+ */
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+ wrapped_key_size = raw_key_aligned->len + block_size;
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+ wrapped_key = g_try_malloc0 (wrapped_key_size);
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+ if (wrapped_key == NULL) {
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+ SECITEM_FreeItem (raw_key_aligned, PR_TRUE);
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+ PK11_DestroyContext (wrap_key_crypt_context, PR_TRUE);
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+ PK11_FreeSymKey (wrapping_key);
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+ return NULL;
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+ }
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+
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+ /* Do the wrap operation. <wrapped_key> is now a pair (<wrapping_key>, <key>)
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+ * expressing that raw key <key> is now encrypted with the <wrapping_key>.
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+ */
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+ ret = PK11_CipherOp (wrap_key_crypt_context, wrapped_key, &out_len,
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+ wrapped_key_size, raw_key_aligned->data,
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+ raw_key_aligned->len);
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+ if (ret != SECSuccess) {
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+ g_free (wrapped_key);
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+ SECITEM_FreeItem (raw_key_aligned, PR_TRUE);
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+ PK11_DestroyContext (wrap_key_crypt_context, PR_TRUE);
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+ PK11_FreeSymKey (wrapping_key);
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+ return NULL;
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+ }
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+
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+ /* Finish the wrapping operation and release no more needed resources. */
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+ ret = PK11_Finalize (wrap_key_crypt_context);
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+ SECITEM_FreeItem (raw_key_aligned, PR_TRUE);
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+ PK11_DestroyContext (wrap_key_crypt_context, PR_TRUE);
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+ if (ret != SECSuccess) {
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+ g_free (wrapped_key);
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+ PK11_FreeSymKey (wrapping_key);
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+ return NULL;
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+ }
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+
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+ /* Prepare for unwrapping the <key>. */
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+ memset (&tmp_sec_item, 0, sizeof (tmp_sec_item));
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+ memset (&wrapped_key_item, 0, sizeof (wrapped_key_item));
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+ wrapped_key_item.data = wrapped_key;
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+ wrapped_key_item.len = wrapped_key_size;
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+
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+ /* Unwrap the <key>. First, decrypt the <key> with the <wrapping_key> to get
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+ * its raw form. Then make a symmetric key (<key>, <type>, <operation>). This
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+ * makes a symmetric key from the raw <key> in a FIPS compliant manner.
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+ */
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+ sym_key = PK11_UnwrapSymKey (wrapping_key, wrap_mechanism, &tmp_sec_item,
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+ &wrapped_key_item, type, operation, key->len);
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+ g_free (wrapped_key);
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+ PK11_FreeSymKey (wrapping_key);
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+ return sym_key;
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+}
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+
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/* LIBVK_PACKET_FORMAT_ASYMMETRIC */
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/* Encrypt DATA of SIZE for CERT.
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@@ -291,9 +400,9 @@ wrap_asymmetric (void **wrapped_secret, size_t *wrapped_secret_size,
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CKM_GENERIC_SECRET_KEY_GEN. */
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clear_secret_item.data = (void *)clear_secret_data;
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clear_secret_item.len = clear_secret_size;
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- secret_key = PK11_ImportSymKey (slot, CKM_GENERIC_SECRET_KEY_GEN,
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- PK11_OriginUnwrap, CKA_WRAP,
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- &clear_secret_item, pwfn_arg);
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+ secret_key = import_sym_key (slot, CKM_GENERIC_SECRET_KEY_GEN,
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+ PK11_OriginUnwrap, CKA_WRAP,
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+ &clear_secret_item, pwfn_arg);
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PK11_FreeSlot (slot);
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if (secret_key == NULL)
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{
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@@ -471,9 +580,9 @@ wrap_symmetric (void **wrapped_secret, size_t *wrapped_secret_size, void **iv,
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/* The disk encryption mechanism might not have a PKCS11 name, and we don't
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really need to tell NSS specifics anyway, so just use
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CKM_GENERIC_SECRET_KEY_GEN. */
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- secret_key = PK11_ImportSymKey (slot, CKM_GENERIC_SECRET_KEY_GEN,
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- PK11_OriginUnwrap, CKA_WRAP,
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- &clear_secret_item, pwfn_arg);
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+ secret_key = import_sym_key (slot, CKM_GENERIC_SECRET_KEY_GEN,
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+ PK11_OriginUnwrap, CKA_WRAP,
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+ &clear_secret_item, pwfn_arg);
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PK11_FreeSlot (slot);
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if (secret_key == NULL)
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{
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