move reclaim and gns back into subdirs

1 files changed, 436 insertions, 0 deletions

diff --git a/src/reclaim/oidc_helper.c b/src/reclaim/oidc_helper.c
new file mode 100644
index 000000000..646e58551
--- /dev/null
+++ b/src/reclaim/oidc_helper.c
@@ -0,0 +1,436 @@
+/*
+      This file is part of GNUnet
+      Copyright (C) 2010-2015 GNUnet e.V.
+
+      GNUnet is free software: you can redistribute it and/or modify it
+      under the terms of the GNU Affero General Public License as published
+      by the Free Software Foundation, either version 3 of the License,
+      or (at your option) any later version.
+
+      GNUnet is distributed in the hope that it will be useful, but
+      WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+      Affero General Public License for more details.
+     
+      You should have received a copy of the GNU Affero General Public License
+      along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+     SPDX-License-Identifier: AGPL3.0-or-later
+ */
+
+/**
+ * @file reclaim/oidc_helper.c
+ * @brief helper library for OIDC related functions
+ * @author Martin Schanzenbach
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_signatures.h"
+#include "gnunet_reclaim_service.h"
+#include "gnunet_reclaim_attribute_lib.h"
+#include <jansson.h>
+#include <inttypes.h>
+#include "oidc_helper.h"
+
+static char*
+create_jwt_header(void)
+{
+  json_t *root;
+  char *json_str;
+
+  root = json_object ();
+  json_object_set_new (root, JWT_ALG, json_string (JWT_ALG_VALUE));
+  json_object_set_new (root, JWT_TYP, json_string (JWT_TYP_VALUE));
+
+  json_str = json_dumps (root, JSON_INDENT(0) | JSON_COMPACT);
+  json_decref (root);
+  return json_str;
+}
+
+static void
+replace_char(char* str, char find, char replace){
+  char *current_pos = strchr(str,find);
+  while (current_pos){
+    *current_pos = replace;
+    current_pos = strchr(current_pos,find);
+  }
+}
+
+//RFC4648
+static void
+fix_base64(char* str) {
+  //Replace + with -
+  replace_char (str, '+', '-');
+
+  //Replace / with _
+  replace_char (str, '/', '_');
+
+}
+
+/**
+ * Create a JWT from attributes
+ *
+ * @param aud_key the public of the audience
+ * @param sub_key the public key of the subject
+ * @param attrs the attribute list
+ * @param expiration_time the validity of the token
+ * @param secret_key the key used to sign the JWT
+ * @return a new base64-encoded JWT string.
+ */
+char*
+OIDC_id_token_new (const struct GNUNET_CRYPTO_EcdsaPublicKey *aud_key,
+                   const struct GNUNET_CRYPTO_EcdsaPublicKey *sub_key,
+                   const struct GNUNET_RECLAIM_ATTRIBUTE_ClaimList *attrs,
+                   const struct GNUNET_TIME_Relative *expiration_time,
+                   const char *nonce,
+                   const char *secret_key)
+{
+  struct GNUNET_RECLAIM_ATTRIBUTE_ClaimListEntry *le;
+  struct GNUNET_HashCode signature;
+  struct GNUNET_TIME_Absolute exp_time;
+  struct GNUNET_TIME_Absolute time_now;
+  char* audience;
+  char* subject;
+  char* header;
+  char* body_str;
+  char* result;
+  char* header_base64;
+  char* body_base64;
+  char* signature_target;
+  char* signature_base64;
+  char* attr_val_str;
+  json_t* body;
+
+  //iat REQUIRED time now
+  time_now = GNUNET_TIME_absolute_get();
+  //exp REQUIRED time expired from config
+  exp_time = GNUNET_TIME_absolute_add (time_now, *expiration_time);
+  //auth_time only if max_age
+  //nonce only if nonce
+  // OPTIONAL acr,amr,azp
+  subject = GNUNET_STRINGS_data_to_string_alloc (sub_key,
+                                                 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
+  audience = GNUNET_STRINGS_data_to_string_alloc (aud_key,
+                                                  sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
+  header = create_jwt_header ();
+  body = json_object ();
+
+  //iss REQUIRED case sensitive server uri with https
+  //The issuer is the local reclaim instance (e.g. https://reclaim.id/api/openid)
+  json_object_set_new (body,
+                       "iss", json_string (SERVER_ADDRESS));
+  //sub REQUIRED public key identity, not exceed 255 ASCII  length
+  json_object_set_new (body,
+                       "sub", json_string (subject));
+  //aud REQUIRED public key client_id must be there
+  json_object_set_new (body,
+                       "aud", json_string (audience));
+  //iat
+  json_object_set_new (body,
+                       "iat", json_integer (time_now.abs_value_us / (1000*1000)));
+  //exp
+  json_object_set_new (body,
+                       "exp", json_integer (exp_time.abs_value_us / (1000*1000)));
+  //nbf
+  json_object_set_new (body,
+                       "nbf", json_integer (time_now.abs_value_us / (1000*1000)));
+  //nonce
+  if (NULL != nonce)
+    json_object_set_new (body,
+                         "nonce", json_string (nonce));
+
+  for (le = attrs->list_head; NULL != le; le = le->next)
+  {
+    attr_val_str = GNUNET_RECLAIM_ATTRIBUTE_value_to_string (le->claim->type,
+                                                             le->claim->data,
+                                                             le->claim->data_size);
+    json_object_set_new (body,
+                         le->claim->name,
+                         json_string (attr_val_str));
+    GNUNET_free (attr_val_str);
+  }
+  body_str = json_dumps (body, JSON_INDENT(0) | JSON_COMPACT);
+  json_decref (body);
+
+  GNUNET_STRINGS_base64_encode (header,
+                                strlen (header),
+                                &header_base64);
+  fix_base64(header_base64);
+
+  GNUNET_STRINGS_base64_encode (body_str,
+                                strlen (body_str),
+                                &body_base64);
+  fix_base64(body_base64);
+
+  GNUNET_free (subject);
+  GNUNET_free (audience);
+
+  /**
+   * Creating the JWT signature. This might not be
+   * standards compliant, check.
+   */
+  GNUNET_asprintf (&signature_target, "%s.%s", header_base64, body_base64);
+  GNUNET_CRYPTO_hmac_raw (secret_key, strlen (secret_key), signature_target, strlen (signature_target), &signature);
+  GNUNET_STRINGS_base64_encode ((const char*)&signature,
+                                sizeof (struct GNUNET_HashCode),
+                                &signature_base64);
+  fix_base64(signature_base64);
+
+  GNUNET_asprintf (&result, "%s.%s.%s",
+                   header_base64, body_base64, signature_base64);
+
+  GNUNET_free (signature_target);
+  GNUNET_free (header);
+  GNUNET_free (body_str);
+  GNUNET_free (signature_base64);
+  GNUNET_free (body_base64);
+  GNUNET_free (header_base64);
+  return result;
+}
+/**
+ * Builds an OIDC authorization code including
+ * a reclaim ticket and nonce
+ *
+ * @param issuer the issuer of the ticket, used to sign the ticket and nonce
+ * @param ticket the ticket to include in the code
+ * @param nonce the nonce to include in the code
+ * @return a new authorization code (caller must free)
+ */
+char*
+OIDC_build_authz_code (const struct GNUNET_CRYPTO_EcdsaPrivateKey *issuer,
+                       const struct GNUNET_RECLAIM_Ticket *ticket,
+                       const char* nonce)
+{
+  char *ticket_str;
+  json_t *code_json;
+  char *signature_payload;
+  char *signature_str;
+  char *authz_code;
+  size_t signature_payload_len;
+  struct GNUNET_CRYPTO_EcdsaSignature signature;
+  struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
+
+  signature_payload_len = sizeof (struct GNUNET_RECLAIM_Ticket);
+  if (NULL != nonce)
+    signature_payload_len += strlen (nonce);
+
+  signature_payload = GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) + signature_payload_len);
+  purpose = (struct GNUNET_CRYPTO_EccSignaturePurpose *)signature_payload;
+  purpose->size = htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) + signature_payload_len);
+  purpose->purpose = htonl (GNUNET_SIGNATURE_PURPOSE_RECLAIM_CODE_SIGN);
+  memcpy (&purpose[1],
+          ticket,
+          sizeof (struct GNUNET_RECLAIM_Ticket));
+  if (NULL != nonce)
+    memcpy (((char*)&purpose[1]) + sizeof (struct GNUNET_RECLAIM_Ticket),
+            nonce,
+            strlen (nonce));
+  if (GNUNET_SYSERR == GNUNET_CRYPTO_ecdsa_sign (issuer,
+                                                 purpose,
+                                                 &signature))
+  {
+    GNUNET_free (signature_payload);
+    return NULL;
+  }
+  signature_str = GNUNET_STRINGS_data_to_string_alloc (&signature,
+                                                       sizeof (signature));
+  ticket_str = GNUNET_STRINGS_data_to_string_alloc (ticket,
+                                                    sizeof (struct GNUNET_RECLAIM_Ticket));
+
+  code_json = json_object ();
+  json_object_set_new (code_json,
+                       "ticket",
+                       json_string (ticket_str));
+  if (NULL != nonce)
+    json_object_set_new (code_json,
+                         "nonce",
+                         json_string (nonce));
+  json_object_set_new (code_json,
+                       "signature",
+                       json_string (signature_str));
+  authz_code = json_dumps (code_json,
+                           JSON_INDENT(0) | JSON_COMPACT);
+  GNUNET_free (signature_payload);
+  GNUNET_free (signature_str);
+  GNUNET_free (ticket_str);
+  json_decref (code_json);
+  return authz_code;
+}
+
+
+
+
+/**
+ * Parse reclaim ticket and nonce from
+ * authorization code.
+ * This also verifies the signature in the code.
+ *
+ * @param audience the expected audience of the code
+ * @param code the string representation of the code
+ * @param ticket where to store the ticket
+ * @param nonce where to store the nonce
+ * @return GNUNET_OK if successful, else GNUNET_SYSERR
+ */
+int
+OIDC_parse_authz_code (const struct GNUNET_CRYPTO_EcdsaPublicKey *audience,
+                       const char* code,
+                       struct GNUNET_RECLAIM_Ticket **ticket,
+                       char **nonce)
+{
+  json_error_t error;
+  json_t *code_json;
+  json_t *ticket_json;
+  json_t *nonce_json;
+  json_t *signature_json;
+  const char *ticket_str;
+  const char *signature_str;
+  const char *nonce_str;
+  char *code_output;
+  struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
+  struct GNUNET_CRYPTO_EcdsaSignature signature;
+  size_t signature_payload_len;
+
+  code_output = NULL; 
+  GNUNET_STRINGS_base64_decode (code,
+                                strlen(code),
+                                (void**)&code_output);
+  code_json = json_loads (code_output, 0 , &error);
+  GNUNET_free (code_output);
+  ticket_json = json_object_get (code_json, "ticket");
+  nonce_json = json_object_get (code_json, "nonce");
+  signature_json = json_object_get (code_json, "signature");
+  *ticket = NULL;
+  *nonce = NULL;
+
+  if ((NULL == ticket_json || !json_is_string (ticket_json)) ||
+      (NULL == signature_json || !json_is_string (signature_json)))
+  {
+    json_decref (code_json);
+    return GNUNET_SYSERR;
+  }
+  ticket_str = json_string_value (ticket_json);
+  signature_str = json_string_value (signature_json);
+  nonce_str = NULL;
+  if (NULL != nonce_json)
+    nonce_str = json_string_value (nonce_json);
+  signature_payload_len = sizeof (struct GNUNET_RECLAIM_Ticket);
+  if (NULL != nonce_str)
+    signature_payload_len += strlen (nonce_str);
+  purpose = GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
+                           signature_payload_len);
+  purpose->size = htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) + signature_payload_len);
+  purpose->purpose = htonl (GNUNET_SIGNATURE_PURPOSE_RECLAIM_CODE_SIGN);
+  if (GNUNET_OK != GNUNET_STRINGS_string_to_data (ticket_str,
+                                                  strlen (ticket_str),
+                                                  &purpose[1],
+                                                  sizeof (struct GNUNET_RECLAIM_Ticket)))
+  {
+    GNUNET_free (purpose);
+    json_decref (code_json);
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Cannot parse ticket!\n");
+    return GNUNET_SYSERR;
+  }
+  if (GNUNET_OK != GNUNET_STRINGS_string_to_data (signature_str,
+                                                  strlen (signature_str),
+                                                  &signature,
+                                                  sizeof (struct GNUNET_CRYPTO_EcdsaSignature)))
+  {
+    GNUNET_free (purpose);
+    json_decref (code_json);
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Cannot parse signature!\n");
+    return GNUNET_SYSERR;
+  }
+  *ticket = GNUNET_new (struct GNUNET_RECLAIM_Ticket);
+  memcpy (*ticket,
+          &purpose[1],
+          sizeof (struct GNUNET_RECLAIM_Ticket));
+  if (0 != memcmp (audience,
+                   &(*ticket)->audience,
+                   sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey)))
+  {
+    GNUNET_free (purpose);
+    GNUNET_free (*ticket);
+    json_decref (code_json);
+    *ticket = NULL;
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Audience in ticket does not match client!\n");
+    return GNUNET_SYSERR;
+
+  }
+  if (NULL != nonce_str)
+    memcpy (((char*)&purpose[1]) + sizeof (struct GNUNET_RECLAIM_Ticket),
+            nonce_str,
+            strlen (nonce_str));
+  if (GNUNET_OK != GNUNET_CRYPTO_ecdsa_verify (GNUNET_SIGNATURE_PURPOSE_RECLAIM_CODE_SIGN,
+                                               purpose,
+                                               &signature,
+                                               &(*ticket)->identity))
+  {
+    GNUNET_free (purpose);
+    GNUNET_free (*ticket);
+    json_decref (code_json);
+    *ticket = NULL;
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Signature of authZ code invalid!\n");
+    return GNUNET_SYSERR;
+  }
+  *nonce = GNUNET_strdup (nonce_str);
+  return GNUNET_OK;
+}
+
+/**
+ * Build a token response for a token request
+ * TODO: Maybe we should add the scope here?
+ *
+ * @param access_token the access token to include
+ * @param id_token the id_token to include
+ * @param expiration_time the expiration time of the token(s)
+ * @param token_response where to store the response
+ */
+void
+OIDC_build_token_response (const char *access_token,
+                           const char *id_token,
+                           const struct GNUNET_TIME_Relative *expiration_time,
+                           char **token_response)
+{
+  json_t *root_json;
+
+  root_json = json_object ();
+
+  GNUNET_assert (NULL != access_token);
+  GNUNET_assert (NULL != id_token);
+  GNUNET_assert (NULL != expiration_time);
+  json_object_set_new (root_json,
+                       "access_token",
+                       json_string (access_token));
+  json_object_set_new (root_json,
+                       "token_type",
+                       json_string ("Bearer"));
+  json_object_set_new (root_json,
+                       "expires_in",
+                       json_integer (expiration_time->rel_value_us / (1000 * 1000)));
+  json_object_set_new (root_json,
+                       "id_token",
+                       json_string (id_token));
+  *token_response = json_dumps (root_json,
+                                JSON_INDENT(0) | JSON_COMPACT);
+  json_decref (root_json);
+}
+
+/**
+ * Generate a new access token
+ */
+char*
+OIDC_access_token_new ()
+{
+  char* access_token_number;
+  char* access_token;
+  uint64_t random_number;
+
+  random_number = GNUNET_CRYPTO_random_u64(GNUNET_CRYPTO_QUALITY_NONCE, UINT64_MAX);
+  GNUNET_asprintf (&access_token_number, "%" PRIu64, random_number);
+  GNUNET_STRINGS_base64_encode(access_token_number,strlen(access_token_number),&access_token);
+  return access_token;
+}