}
+static void
+derive_aes_key (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
+ struct GNUNET_CRYPTO_SymmetricInitializationVector *iv,
+ struct GNUNET_HashCode *key_material)
+{
+ static const char ctx_key[] = "reclaim-aes-ctx-key";
+ static const char ctx_iv[] = "reclaim-aes-ctx-iv";
+ GNUNET_CRYPTO_kdf (key,
+ sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
+ ctx_key,
+ strlen (ctx_key),
+ key_material,
+ sizeof (struct GNUNET_HashCode),
+ NULL);
+ GNUNET_CRYPTO_kdf (iv,
+ sizeof (
+ struct GNUNET_CRYPTO_SymmetricInitializationVector),
+ ctx_iv,
+ strlen (ctx_iv),
+ key_material,
+ sizeof (struct GNUNET_HashCode),
+ NULL);
+}
+
+
+static void
+calculate_key_priv (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
+ struct GNUNET_CRYPTO_SymmetricInitializationVector *iv,
+ const struct GNUNET_CRYPTO_EcdsaPrivateKey *ecdsa_priv,
+ const struct GNUNET_CRYPTO_EcdhePublicKey *ecdh_pub)
+{
+ struct GNUNET_HashCode key_material;
+ GNUNET_CRYPTO_ecdsa_ecdh (ecdsa_priv, ecdh_pub, &key_material);
+ derive_aes_key (key, iv, &key_material);
+}
+
+
+static void
+calculate_key_pub (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
+ struct GNUNET_CRYPTO_SymmetricInitializationVector *iv,
+ const struct GNUNET_CRYPTO_EcdsaPublicKey *ecdsa_pub,
+ const struct GNUNET_CRYPTO_EcdhePrivateKey *ecdh_priv)
+{
+ struct GNUNET_HashCode key_material;
+ GNUNET_CRYPTO_ecdh_ecdsa (ecdh_priv, ecdsa_pub, &key_material);
+ derive_aes_key (key, iv, &key_material);
+}
+
+
+static void
+decrypt_payload (const struct GNUNET_CRYPTO_EcdsaPrivateKey *ecdsa_priv,
+ const struct GNUNET_CRYPTO_EcdhePublicKey *ecdh_pub,
+ const char *ct,
+ size_t ct_len,
+ char *buf)
+{
+ struct GNUNET_CRYPTO_SymmetricSessionKey key;
+ struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
+
+ calculate_key_priv (&key, &iv, ecdsa_priv, ecdh_pub);
+ GNUNET_break (GNUNET_CRYPTO_symmetric_decrypt (ct, ct_len, &key, &iv, buf));
+}
+
+
+static void
+encrypt_payload (const struct GNUNET_CRYPTO_EcdsaPublicKey *ecdsa_pub,
+ const struct GNUNET_CRYPTO_EcdhePrivateKey *ecdh_priv,
+ const char *payload,
+ size_t payload_len,
+ char *buf)
+{
+ struct GNUNET_CRYPTO_SymmetricSessionKey key;
+ struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
+
+ calculate_key_pub (&key, &iv, ecdsa_pub, ecdh_priv);
+ GNUNET_break (
+ GNUNET_CRYPTO_symmetric_encrypt (payload, payload_len, &key, &iv, buf));
+}
+
+
/**
* Builds an OIDC authorization code including
* a reclaim ticket and nonce
const char *nonce_str)
{
char *code_payload;
+ char *plaintext;
char *attrs_ser;
char *code_str;
char *buf_ptr;
uint32_t nonce;
uint32_t nonce_tmp;
struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
+ struct GNUNET_CRYPTO_EcdhePrivateKey *ecdh_priv;
+ struct GNUNET_CRYPTO_EcdhePublicKey ecdh_pub;
attrs_ser = NULL;
signature_payload_len =
GNUNET_RECLAIM_ATTRIBUTE_list_serialize (attrs, attrs_ser);
}
code_payload_len = sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
+ sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
signature_payload_len +
sizeof (struct GNUNET_CRYPTO_EcdsaSignature);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Length of data to encode: %lu\n",
code_payload_len);
- code_payload = GNUNET_malloc (code_payload_len);
- GNUNET_assert (NULL != code_payload);
- purpose = (struct GNUNET_CRYPTO_EccSignaturePurpose *) code_payload;
- purpose->size = htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
- signature_payload_len);
- purpose->purpose = htonl (GNUNET_SIGNATURE_PURPOSE_RECLAIM_CODE_SIGN);
+ plaintext = GNUNET_malloc (signature_payload_len);
// First, copy ticket
- buf_ptr = (char *) &purpose[1];
+ buf_ptr = plaintext;
memcpy (buf_ptr, ticket, sizeof (struct GNUNET_RECLAIM_Ticket));
buf_ptr += sizeof (struct GNUNET_RECLAIM_Ticket);
// Then copy nonce
{
GNUNET_break (0);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Invalid nonce %s\n", nonce_str);
- GNUNET_free (code_payload);
+ GNUNET_free (plaintext);
GNUNET_free_non_null (attrs_ser);
return NULL;
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Got nonce: %u from %s\n", nonce, nonce_str);
+ "Got nonce: %u from %s\n",
+ nonce,
+ nonce_str);
}
nonce_tmp = htonl (nonce);
memcpy (buf_ptr, &nonce_tmp, sizeof (uint32_t));
{
memcpy (buf_ptr, attrs_ser, attr_list_len);
buf_ptr += attr_list_len;
+ GNUNET_free (attrs_ser);
}
+ // Generate ECDH key
+ ecdh_priv = GNUNET_CRYPTO_ecdhe_key_create ();
+ GNUNET_CRYPTO_ecdhe_key_get_public (ecdh_priv, &ecdh_pub);
+ // Initialize code payload
+ code_payload = GNUNET_malloc (code_payload_len);
+ GNUNET_assert (NULL != code_payload);
+ purpose = (struct GNUNET_CRYPTO_EccSignaturePurpose *) code_payload;
+ purpose->size = htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
+ sizeof (ecdh_pub) + signature_payload_len);
+ purpose->purpose = htonl (GNUNET_SIGNATURE_PURPOSE_RECLAIM_CODE_SIGN);
+ // Store pubkey
+ buf_ptr = (char *) &purpose[1];
+ memcpy (buf_ptr, &ecdh_pub, sizeof (ecdh_pub));
+ buf_ptr += sizeof (ecdh_pub);
+ // Encrypt plaintext and store
+ encrypt_payload (&ticket->audience,
+ ecdh_priv,
+ plaintext,
+ signature_payload_len,
+ buf_ptr);
+ GNUNET_free (ecdh_priv);
+ GNUNET_free (plaintext);
+ buf_ptr += signature_payload_len;
+ // Sign and store signature
if (GNUNET_SYSERR ==
GNUNET_CRYPTO_ecdsa_sign (issuer,
purpose,
GNUNET_break (0);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unable to sign code\n");
GNUNET_free (code_payload);
- GNUNET_free_non_null (attrs_ser);
return NULL;
}
code_str = base64_encode (code_payload, code_payload_len);
GNUNET_free (code_payload);
- GNUNET_free_non_null (attrs_ser);
return code_str;
}
* @return GNUNET_OK if successful, else GNUNET_SYSERR
*/
int
-OIDC_parse_authz_code (const struct GNUNET_CRYPTO_EcdsaPublicKey *audience,
+OIDC_parse_authz_code (const struct GNUNET_CRYPTO_EcdsaPrivateKey *ecdsa_priv,
const char *code,
struct GNUNET_RECLAIM_Ticket *ticket,
struct GNUNET_RECLAIM_ATTRIBUTE_ClaimList **attrs,
{
char *code_payload;
char *ptr;
+ char *plaintext;
struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
struct GNUNET_CRYPTO_EcdsaSignature *signature;
+ struct GNUNET_CRYPTO_EcdsaPublicKey ecdsa_pub;
+ struct GNUNET_CRYPTO_EcdhePublicKey *ecdh_pub;
size_t code_payload_len;
size_t attrs_ser_len;
size_t signature_offset;
+ size_t plaintext_len;
uint32_t nonce = 0;
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Trying to decode `%s'\n", code);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Trying to decode `%s'\n", code);
code_payload = NULL;
code_payload_len =
GNUNET_STRINGS_base64_decode (code, strlen (code), (void **) &code_payload);
-
if (code_payload_len < sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
+ sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
sizeof (struct GNUNET_RECLAIM_Ticket) +
sizeof (uint32_t) +
sizeof (struct GNUNET_CRYPTO_EcdsaSignature))
attrs_ser_len = code_payload_len;
attrs_ser_len -= sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose);
ptr = (char *) &purpose[1];
+ // Public ECDH key
+ ecdh_pub = (struct GNUNET_CRYPTO_EcdhePublicKey *) ptr;
+ ptr += sizeof (struct GNUNET_CRYPTO_EcdhePublicKey);
+ attrs_ser_len -= sizeof (struct GNUNET_CRYPTO_EcdhePublicKey);
+
+ // Decrypt ciphertext
+ plaintext_len = attrs_ser_len - sizeof (struct GNUNET_CRYPTO_EcdsaSignature);
+ plaintext = GNUNET_malloc (plaintext_len);
+ decrypt_payload (ecdsa_priv, ecdh_pub, ptr, plaintext_len, plaintext);
+ ptr = plaintext;
+ // Ticket
*ticket = *((struct GNUNET_RECLAIM_Ticket *) ptr);
attrs_ser_len -= sizeof (struct GNUNET_RECLAIM_Ticket);
ptr += sizeof (struct GNUNET_RECLAIM_Ticket);
+ // Nonce
nonce = ntohl (*((uint32_t *) ptr));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Got nonce: %u\n", nonce);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got nonce: %u\n", nonce);
attrs_ser_len -= sizeof (uint32_t);
ptr += sizeof (uint32_t);
+ // Attributes
attrs_ser_len -= sizeof (struct GNUNET_CRYPTO_EcdsaSignature);
*attrs = GNUNET_RECLAIM_ATTRIBUTE_list_deserialize (ptr, attrs_ser_len);
+ // Signature
signature_offset =
code_payload_len - sizeof (struct GNUNET_CRYPTO_EcdsaSignature);
signature =
(struct GNUNET_CRYPTO_EcdsaSignature *) &code_payload[signature_offset];
- if (0 != GNUNET_memcmp (audience, &ticket->audience))
+ GNUNET_CRYPTO_ecdsa_key_get_public (ecdsa_priv, &ecdsa_pub);
+ if (0 != GNUNET_memcmp (&ecdsa_pub, &ticket->audience))
{
GNUNET_RECLAIM_ATTRIBUTE_list_destroy (*attrs);
GNUNET_free (code_payload);
+ GNUNET_free (plaintext);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Audience in ticket does not match client!\n");
return GNUNET_SYSERR;
{
GNUNET_RECLAIM_ATTRIBUTE_list_destroy (*attrs);
GNUNET_free (code_payload);
+ GNUNET_free (plaintext);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Signature of AuthZ code invalid!\n");
return GNUNET_SYSERR;
}
*nonce_str = NULL;
if (nonce != 0)
GNUNET_asprintf (nonce_str, "%u", nonce);
+ GNUNET_free (code_payload);
+ GNUNET_free (plaintext);
return GNUNET_OK;
}
projects / oweals / gnunet.git / blobdiff