removed unused files and useless subdirectories

Change-Id: Ie0ebe0104589ff99ae24c7410a484eeef18821e7
Signed-off-by: Loïc Collignon <loic.collignon@iot.bzh>

1 files changed, 812 insertions, 0 deletions

diff --git a/src/oidc-agent.c b/src/oidc-agent.c
new file mode 100644
index 0000000..1f09e7a
--- /dev/null
+++ b/src/oidc-agent.c
@@ -0,0 +1,812 @@
+/*
+ * Copyright (C) 2017 "IoT.bzh"
+ * Author: José Bollo <jose.bollo@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define _GNU_SOURCE
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <pthread.h>
+
+#include <json-c/json.h>
+
+#include "oidc-agent.h"
+#include "escape.h"
+#include "curl-wrap.h"
+
+/***************** utilities *************************/
+
+static const char string_empty[] = "";
+static const char string_authorization_endpoint[] = "authorization_endpoint";
+static const char string_token_endpoint[] = "token_endpoint";
+#if 0
+static const char string_issuer[] = "issuer";
+static const char string_userinfo_endpoint[] = "userinfo_endpoint";
+static const char string_revocation_endpoint[] = "revocation_endpoint";
+static const char string_jwks_uri[] = "jwks_uri";
+#endif
+
+#define MAX_IDP_COUNT     20
+#define MAX_APPLI_COUNT   100
+
+static struct json_object *idps;
+static struct json_object *applis;
+
+static pthread_rwlock_t rwlock = PTHREAD_RWLOCK_INITIALIZER;
+
+/***************** utilities *************************/
+
+/*
+ * Get the object of 'name' in the 'container' and return it.
+ * Creates the result if needed and add it to the container.
+ * When 'maxcount' isn't zero the final count will not exceed 'maxcount'.
+ */
+static struct json_object *j_container_item(struct json_object *container, const char *name, int maxcount)
+{
+	struct json_object *result;
+
+	/* ensure object of 'name' exists */
+	if (!json_object_object_get_ex(container, name, &result)) {
+		if (maxcount && json_object_object_length(container) >= maxcount)
+			return NULL;
+		result = json_object_new_object();
+		if (!result)
+			return NULL;
+		json_object_object_add (container, name, result);
+	}
+	return result;
+}
+
+/*
+ * Like 'j_container_item' but also creates the 'container' if needed.
+ */
+static struct json_object *j_container_item_make(struct json_object **container, const char *name, int maxcount)
+{
+	struct json_object *cont;
+
+	/* ensure container exists */
+	cont = *container;
+	if (!cont) {
+		cont = json_object_new_object();
+		if (!cont)
+			return NULL;
+		*container = cont;
+	}
+	return j_container_item(cont, name, maxcount);
+}
+
+/*
+ * Adds in 'dest' the fields of 'src'
+ * Also when the value of a field of 'src' is null, delete the field of 'dst'
+ */
+static void j_merge(struct json_object *dest, struct json_object *src)
+{
+	struct json_object_iter i;
+	json_object_object_foreachC(src, i) {
+		if (json_object_is_type(i.val, json_type_null))
+			json_object_object_del(dest, i.key);	
+		else
+			json_object_object_add(dest, i.key, json_object_get(i.val));
+	}
+}
+
+/***************** IDP **************************/
+
+/*
+ * Set the values of 'desc' for the idp of 'name'.
+ * Return 0 on error or 1 on success.
+ */
+int oidc_idp_set(const char *name, struct json_object *desc)
+{
+	struct json_object *idp;
+	int result = 0;
+
+	pthread_rwlock_wrlock(&rwlock);
+	idp = j_container_item_make(&idps, name, MAX_IDP_COUNT);
+	if (idp) {
+		j_merge(idp, desc);
+		result = 1;
+	}
+	pthread_rwlock_unlock(&rwlock);
+	return result;
+}
+
+/*
+ * Return 1 if idp of 'name' exists or 0 otherwise.
+ */
+int oidc_idp_exists(const char *name)
+{
+	int result;
+
+	pthread_rwlock_rdlock(&rwlock);
+	result = json_object_object_get_ex(idps, name, NULL);
+	pthread_rwlock_unlock(&rwlock);
+
+	return result;
+}
+
+/*
+ * Deletes the idp of 'name'.
+ */
+void oidc_idp_delete(const char *name)
+{
+	pthread_rwlock_wrlock(&rwlock);
+	json_object_object_del(idps, name);
+	pthread_rwlock_unlock(&rwlock);
+}
+
+/***************** APPLI **************************/
+
+/*
+ * Returns the name of the idp of the 'appli'.
+ * Returns NULL when appli isn't set or default idp isn't set.
+ */
+static const char *get_default_idp(const char *appli)
+{
+	struct json_object *a, *i;
+
+	if (!json_object_object_get_ex(applis, appli, &a))
+		return NULL;
+	if (!json_object_object_get_ex(a, string_empty, &i))
+		return NULL;
+	return json_object_get_string(i);
+}
+
+/*
+ * Returns the application data related to the 'appli' for the 'idp'.
+ * If 'ja' isn't null, returns in it the object for the application 'appli'.
+ * Returns NULL in case of error.
+ */
+static struct json_object *get_appli_idp(const char *appli, const char *idp, struct json_object **ja)
+{
+	struct json_object *a, *i;
+
+	if (!json_object_object_get_ex(applis, appli, &a) || !json_object_object_get_ex(a, idp, &i))
+		return NULL;
+	if (ja)
+		*ja = a;
+	return i;
+}
+
+/*
+ * Set the description 'desc' for the application of 'name' and
+ * the 'idp'. When 'make_default' is set it, make it the default idp
+ * for the application.
+ * Return 0 on error or 1 on success.
+ */
+int oidc_appli_set(const char *name, const char *idp, struct json_object *desc, int make_default)
+{
+	struct json_object *a, *ai;
+	int result = 0;
+
+	pthread_rwlock_wrlock(&rwlock);
+	a = j_container_item_make(&applis, name, MAX_APPLI_COUNT);
+	if (a) {
+		ai = j_container_item(a, idp, 0);
+		if (ai) {
+			j_merge(ai, desc);
+			if (make_default || !json_object_object_get_ex(a, string_empty, NULL))
+				json_object_object_add(a, string_empty, json_object_new_string(idp));
+			result = 1;
+		}
+	}
+	pthread_rwlock_unlock(&rwlock);
+	return result;
+}
+
+/*
+ * Is the appli of 'name' defined?
+ * Return 1 if answer is yes or 0 for no.
+ */
+int oidc_appli_exists(const char *name)
+{
+	int result;
+
+	pthread_rwlock_rdlock(&rwlock);
+	result = json_object_object_get_ex(applis, name, NULL);
+	pthread_rwlock_unlock(&rwlock);
+
+	return result;
+}
+
+/*
+ * Does the appli of 'name' has the 'idp' defined?
+ * Return 1 if answer is yes or 0 for no.
+ */
+int oidc_appli_has_idp(const char *name, const char *idp)
+{
+	int result;
+
+	pthread_rwlock_rdlock(&rwlock);
+	result = !!get_appli_idp(name, idp, NULL);
+	pthread_rwlock_unlock(&rwlock);
+
+	return result;
+}
+
+/*
+ * Set 'idp' as default for the application of 'name'.
+ * Returns 0 on error (appli or idp for appli not existing)
+ * or 1 in case of success.
+ */
+int oidc_appli_set_default_idp(const char *name, const char *idp)
+{
+	struct json_object *a, *i;
+
+	pthread_rwlock_wrlock(&rwlock);
+	i = get_appli_idp(name, idp, &a);
+	if (i)
+		json_object_object_add(a, string_empty, json_object_new_string(idp));
+	pthread_rwlock_unlock(&rwlock);
+
+	return !!i;
+}
+
+/*
+ * Deletes the application of 'name'
+ */
+void oidc_appli_delete(const char *name)
+{
+	pthread_rwlock_wrlock(&rwlock);
+	json_object_object_del(applis, name);
+	pthread_rwlock_unlock(&rwlock);
+}
+
+/***************** AUTHORISATION **************************/
+
+/* parameters */
+enum param
+{
+	Param_Access_Token,
+	Param_Acr_Values,
+	Param_Authorization,
+	Param_Client_Id,
+	Param_Client_Secret,
+	Param_Code,
+	Param_Display,
+	Param_Error,
+	Param_Error_Description,
+	Param_Error_Uri,
+	Param_Expires_In,
+	Param_Grant_Type,
+	Param_Id_Token,
+	Param_Id_Token_Hint,
+	Param_Login_Hint,
+	Param_Max_Age,
+	Param_Nonce,
+	Param_Password,
+	Param_Prompt,
+	Param_Redirect_Uri,
+	Param_Refresh_Token,
+	Param_Response_Type,
+	Param_Scope,
+	Param_State,
+	Param_Token_Type,
+	Param_Ui_Locales,
+	Param_Username,
+	PARAM_COUNT
+};
+
+#if PARAM_COUNT > 30
+# error "Too much parameters"
+#endif
+#define PARAM(p)	((uint32_t)((uint32_t)1 << (Param_##p)))
+
+/* args of authorization requests */
+struct args
+{
+	struct json_object *appli;
+	struct json_object *idp;
+	struct json_object *args;
+	struct oidc_grant_cb cb;
+	int locked;
+	int refresh;
+	uint32_t mandatory;
+	uint32_t all;
+	struct json_object *header;
+	struct json_object *query;
+};
+
+/* Release the lock if needed */
+static void args_unlock(struct args *args)
+{
+	if (!args->locked) {
+		pthread_rwlock_unlock(&rwlock);
+		args->locked = 0;
+	}
+}
+
+/* Release the memory needed by args */
+static void args_destroy(struct args *args)
+{
+	json_object_put(args->appli);
+	json_object_put(args->idp);
+	json_object_put(args->header);
+	json_object_put(args->query);
+	free(args);
+}
+
+/* Send the success event with the gained tokens */
+static void args_send_success(struct args *args, struct json_object *result)
+{
+	args_unlock(args);
+	args->cb.success(args->cb.closure, result);
+	args_destroy(args);
+}
+
+/* Sends the error event with the indice to the client of args */
+static void args_send_error(struct args *args, const char *message, const char *indice)
+{
+	args_unlock(args);
+	args->cb.error(args->cb.closure, message, indice);
+	args_destroy(args);
+}
+
+/* Send the error and also return NULL */
+static inline struct args *args_send_error_null(struct args *args, const char *message, const char *indice)
+{
+	args_send_error(args, message, indice);
+	return NULL;
+}
+
+/* creates a struct args from the arguments, returns NULL on error */
+struct args *mkargs(const char *appli, const char *idp, struct json_object *args, const struct oidc_grant_cb *cb)
+{
+	struct args *result;
+	struct json_object *obj;
+
+	/* allocates the args */
+	result = calloc(1, sizeof *result);
+	if (!result) {
+		cb->error(cb->closure, "Out of memory", NULL);
+		return NULL;
+	}
+
+	/* init of the structure */
+	result->cb = *cb;
+	result->args = args;
+	result->header = json_object_new_object();
+	result->query = json_object_new_object();
+
+	/* lock in read */
+	pthread_rwlock_rdlock(&rwlock);
+	result->locked = 1;
+
+	/* check previous allocations */
+	if (!result->query || !result->header) {
+		return args_send_error_null(result, "Out of memory", NULL);
+	}
+
+	/* check whether default idp */
+	if (!idp) {
+		idp = get_default_idp(appli);
+		if (!idp)
+			return args_send_error_null(result, "No default IDP", NULL);
+	}
+
+	/* get the IDP */
+	if (!json_object_object_get_ex(idps, idp, &obj))
+		return args_send_error_null(result, "Unknown IDP", idp);
+	result->idp = json_object_get(obj);
+
+	/* get the appli */
+	obj = get_appli_idp(appli, idp, NULL);
+	if (!obj)
+		return args_send_error_null(result, "Unknown APPLI for IDP", appli);
+	result->appli = json_object_get(obj);
+
+	return result;
+}
+
+/* get a value for a struct args */
+static struct json_object *args_object(struct args *args, const char *name)
+{
+	struct json_object *result;
+
+	if (!json_object_object_get_ex(args->appli, name, &result)
+		&& !json_object_object_get_ex(args->idp, name, &result)
+		&& !json_object_object_get_ex(args->args, name, &result))
+			result = NULL;
+	return result;
+}
+
+/* get a string value for a struct args */
+static const char *args_string(struct args *args, const char *name)
+{
+	struct json_object *object = args_object(args, name);
+	return object ? json_object_get_string(object) : NULL;
+}
+
+/* add a data */
+static int args_add(struct args *args, uint32_t val, const char *name, int query)
+{
+	struct json_object *obj, *dest;
+
+	if (val & args->all) {
+		obj = args_object(args, name);
+		if (obj) {
+			dest = query ? args->query : args->header;
+			json_object_object_add(dest, name, json_object_get(obj));
+		}
+		else if (val & args->mandatory) {
+			args_send_error(args, "Mandatory field missing", name);
+			return 0;
+		}	
+	}
+
+	return 1;
+}
+
+/*
+ * Makes the CURL object for the given 'url' for either GET or POST depending
+ * on 'post' with the added 'header' fields and the given query parameters.
+ * Returns NULL on error.
+ * Ex:
+ *
+ *   curl_json("http://iot.bzh/api", 0, {"X-Index": "no"}, {"fast":true,"item":"2345-hellfest"})
+ * 
+ * produces the query:
+ *
+ *   GET /api?fast=true&item=2345-hellfest HTTP/1.1
+ *   Host: iot.bzh
+ *   X-Index: no
+ *
+ * while the same but with post not null produces:
+ *
+ *   POST /api HTTP/1.1
+ *   Host: iot.bzh
+ *   X-Index: no
+ *   Content-Type: application/x-www-form-urlencoded
+ *
+ *   fast=true&item=2345-hellfest
+ *
+ */
+static CURL *curl_json(const char *url, int post, struct json_object *header, struct json_object *query)
+{
+	const char **args, *str;
+	struct json_object_iter i;
+	int idx;
+	CURL *result;
+
+	/* create args array */
+	idx = 1 + (json_object_object_length(query) << 1);
+	args = malloc((unsigned)idx * sizeof *args);
+	if (!args)
+		return NULL;
+
+	/* fill the args array */
+	args[--idx] = NULL;
+	json_object_object_foreachC(query, i) {
+		str = json_object_get_string(i.val);
+		args[--idx] = str;
+		args[--idx] = i.key;
+	}
+
+	/* prepare the query */
+ 	if (post)
+		result = curl_wrap_prepare_post(url, NULL, args);
+	else
+		result = curl_wrap_prepare_get(url, NULL, args);
+	free(args);
+	if(!result)
+		return NULL;
+
+	/* add headers */
+	if (header) {
+		json_object_object_foreachC(header, i) {
+			str = json_object_get_string(i.val);
+			if (!curl_wrap_add_header_value(result, i.key, str)) {
+				curl_easy_cleanup(result);	
+				return NULL;
+			}
+		}
+	}
+	return result;
+}
+
+/*
+ * Extract from the answer of 'curl' whose 'content' has 'size' bytes the
+ * embeded JSON object (if any).
+ * Returns it or returns NULL if the answer can't be interpreted.
+ */
+static struct json_object *decode_perform_result(CURL *curl, const char *content, size_t size)
+{
+	int i;
+	const char **args;
+	struct json_object *result;
+
+	/* is it an url encoded answer? */
+	if (curl_wrap_content_type_is(curl, "application/x-www-form-urlencoded")) {
+		/* yes, unescape as an array of strings */
+		args = unescape_args(content);
+		if (!args)
+			result = NULL;
+		else {
+			/* wrap the key=value pairs in an object  */
+			result = json_object_new_object();
+			if (result) {
+				for (i = 0 ; args[i] ; i += 2)
+					json_object_object_add(result, args[i],
+						json_object_new_string(args[i+1]));
+			}
+			free(args);
+		}
+	} else if (curl_wrap_content_type_is(curl, "application/json")) {
+		/* interpret the json */
+		result = json_tokener_parse (content);
+	} else {
+		/* by default, still try to interpret the answer as if json */
+		result = json_tokener_parse (content);
+	}
+	return result;
+}
+
+/*
+ * Treats the result of the query 'curl' of 'content' of 'size' bytes for the 'args'
+ */
+static void perform_result(struct args *args, CURL *curl, const char *content, size_t size)
+{
+	struct json_object *obj, *at, *tt;
+	char *txt;
+
+	/* get answer */
+	obj = decode_perform_result(curl, content, size);
+	if (!obj)
+		return args_send_error(args, "unable to extract answer", content);
+
+	/* process the answer */
+	if (json_object_object_get_ex(obj, "access_token", &at) && json_object_object_get_ex(obj, "token_type", &tt)) {
+		if (!strcmp(json_object_get_string(tt), "bearer")) {
+			if (asprintf(&txt, "Bearer %s", json_object_get_string(at)) > 0) {
+				json_object_object_add(obj, "authorization", json_object_new_string(txt));
+				free(txt);
+			}
+		}
+	}
+
+	/* merge the answer to the token args in case of refresh */
+	if (args->refresh)
+		j_merge(args->args, obj);
+
+	/* send the answer */
+	args_send_success(args, obj);
+}
+
+/*
+ * Treats the redirect answer of the query 'curl' of 'content' of 'size' bytes for the 'args'
+ */
+static void perform_redirect(struct args *args, CURL *curl, const char *content, size_t size)
+{
+	/* TODO: handle redirection for the normal flow */
+	return args_send_error(args, "unhandled redirection", content);
+}
+
+/*
+ * Handle the result of the query 'curl' of 'status'. If a data is returned, it is available in
+ * 'content' of 'size' bytes.
+ * When 'status' is 0, an error occured. Otherwise, 'statu' isn't zero.
+ */
+static void perform_callback(void *closure, int status, CURL *curl, const char *content, size_t size)
+{
+	long code;
+	struct args *args = closure;
+
+	/* query error ? */
+	if (!status
+	 || curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code) != CURLE_OK)
+		return args_send_error(args, "query error", NULL); /* TODO: IMPROVE? */
+
+	/* get the returned code */
+	switch (code) {
+	case 200:
+		return perform_result(args, curl, content, size);
+	case 302:
+		return perform_redirect(args, curl, content, size);
+	case 400:
+	case 401:
+		return args_send_error(args, content ? : "returned code error", content ? "returned code error" : content);
+	default:
+		return args_send_error(args, content ? : "unexpected code error", content ? "unexpected code error" : content);
+	}
+}
+
+/*
+ * Main function for performing OAuth2/OpenId Connect transactions.
+ * The structure 'args' is filled with the needed values:
+ *   Application data as json object, IDP data as json object
+ *   Contextual arguments for the transaction.
+ * 'endpoint' must be the name of an endpoint in the context of 'args'.
+ * 'operation' is the value that will get either response_type or grant_type,
+ * depending on the nature of the required parameters 'mandatory'.
+ * 'mandatory' designates the mandatory parameters.
+ * 'optional' designate the optional parameters.
+ */
+static void perform(struct args *args, const char *endpoint, const char *operation, uint32_t mandatory, uint32_t optional)
+{
+	int post;
+	const char *url, *type;
+	CURL *curl;
+
+	/* set the flags */
+	args->mandatory = mandatory;
+	args->all = mandatory | optional;
+
+	/* get the endpoint */
+	url = args_string(args, endpoint);
+	if (!url)
+		return args_send_error(args, "No endpoint", endpoint);
+
+	/* get the operation type */
+	if ((mandatory & PARAM(Response_Type)) == PARAM(Response_Type)) {
+		type = "response_type";
+		post = 0; /* can be 1 sometimes so not risk here */
+	} else if ((mandatory & PARAM(Grant_Type)) == PARAM(Grant_Type)) {
+		type = "grant_type";
+		post = 1; /* must be 1 */
+	} else
+		return args_send_error(args, "Unexpected operation Type", NULL);
+		
+	json_object_object_add(args->query, type, json_object_new_string(operation));
+
+	/* get the arguments */
+	if (1
+	 && args_add(args, PARAM(Access_Token), "access_token", 1)
+	 && args_add(args, PARAM(Acr_Values), "acr_values", 1)
+	 && args_add(args, PARAM(Authorization), "authorization", 0)
+	 && args_add(args, PARAM(Client_Id), "client_id", 1)
+	 && args_add(args, PARAM(Client_Secret), "client_secret", 1)
+	 && args_add(args, PARAM(Code), "code", 1)
+	 && args_add(args, PARAM(Display), "display", 1)
+	 && args_add(args, PARAM(Expires_In), "expires_in", 1)
+	 && args_add(args, PARAM(Id_Token_Hint), "id_token_hint", 1)
+	 && args_add(args, PARAM(Login_Hint), "login_hint", 1)
+	 && args_add(args, PARAM(Max_Age), "max_age", 1)
+	 && args_add(args, PARAM(Nonce), "nonce", 1)
+	 && args_add(args, PARAM(Password), "password", 1)
+	 && args_add(args, PARAM(Prompt), "prompt", 1)
+	 && args_add(args, PARAM(Redirect_Uri), "redirect_uri", 1)
+	 && args_add(args, PARAM(Refresh_Token), "refresh_token", 1)
+	 && args_add(args, PARAM(Scope), "scope", 1)
+	 && args_add(args, PARAM(State), "state", 1)
+	 && args_add(args, PARAM(Token_Type), "token_type", 1)
+	 && args_add(args, PARAM(Ui_Locales), "ui_locales", 1)
+	 && args_add(args, PARAM(Username), "username", 1)
+	) {
+		/* creates the curl query */
+		curl = curl_json(url, post, args->header, args->query);
+		if (!curl)
+			return args_send_error(args, "out of memory", NULL);
+
+		/* release data */
+		args_unlock(args);
+
+		/* perform the request to the server */
+		curl_wrap_do(curl, perform_callback, args);
+	}
+}
+
+/* perform a grant of flow Flow_Resource_Owner_Password_Credentials_Grant */
+static void grant_owner_password(struct args *args)
+{
+	perform(args, string_token_endpoint, "password",
+			PARAM(Grant_Type) | PARAM(Username) | PARAM(Password),
+			PARAM(Scope) | PARAM(Authorization)
+		);
+}
+
+/* perform a grant of flow Flow_Client_Credentials_Grant */
+static void grant_client_credentials(struct args *args)
+{
+	perform(args, string_token_endpoint, "client_credentials",
+			PARAM(Grant_Type),
+			PARAM(Scope) | PARAM(Authorization)
+		);
+}
+
+/* switches the requests depending on 'flow' */
+static void grant(struct args *args, enum oidc_grant_flow flow)
+{
+	/* ensure args is valid */
+	if (!args)
+		return;
+
+	/* process for flow */
+	switch(flow) {
+
+	case Flow_Resource_Owner_Password_Credentials_Grant:
+		grant_owner_password(args);
+		break;
+
+	case Flow_Client_Credentials_Grant:
+		grant_client_credentials(args);
+		break;
+
+	case Flow_Authorization_Code_Grant:
+	case Flow_Implicit_Grant:
+	case Flow_Extension_Grant:
+		args_send_error(args, "Unsupported flow", NULL);
+		break;
+		
+	case Flow_Invalid:
+	default:
+		args_send_error(args, "Invalid flow", NULL);
+		break;
+	}
+}
+
+/*
+ * Initiates a grant with the given 'flow'.
+ * 'appli' and 'idp' designates the appli and the idp that have been recorded.
+ * when idp == NULL or idp == "", the default idp of 'appli' is used.
+ * 'args' contains parameters expected in plus for the grant transaction.
+ * 'cb' describes the callback actions that are called before
+ * the function returns.
+ */
+void oidc_grant(const char *appli, const char *idp, struct json_object *args, const struct oidc_grant_cb *cb, enum oidc_grant_flow flow)
+{
+	grant(mkargs(appli, idp, args, cb), flow);
+}
+
+/*
+ * Like oidc_grant for flow Flow_Resource_Owner_Password_Credentials_Grant
+ */
+void oidc_grant_owner_password(const char *appli, const char *idp, struct json_object *args, const struct oidc_grant_cb *cb)
+{
+	grant(mkargs(appli, idp, args, cb), Flow_Resource_Owner_Password_Credentials_Grant);
+}
+
+/*
+ * Like oidc_grant for flow Flow_Client_Credentials_Grant
+ */
+void oidc_grant_client_credentials(const char *appli, const char *idp, struct json_object *args, const struct oidc_grant_cb *cb)
+{
+	grant(mkargs(appli, idp, args, cb), Flow_Client_Credentials_Grant);
+}
+
+/*
+ * Refreshes the 'token' for the 'appli' and the  'idp'.
+ * 'cb' describes the callback actions that are called before
+ * the function returns.
+ */
+void oidc_token_refresh(const char *appli, const char *idp, struct json_object *token, const struct oidc_grant_cb *cb)
+{
+	struct args *args;
+
+	args = mkargs(appli, idp, token, cb);
+	if (!args)
+		return;
+	args->refresh = 1;
+	perform(args, string_token_endpoint, "refresh_token",
+			PARAM(Grant_Type) | PARAM(Refresh_Token),
+			PARAM(Scope) | PARAM(Authorization)
+		);
+}
+
+/*
+ * Adds the header "authorisation" with the bearer access_token of 'token'.
+ * Return 1 on case of success or 0 otherwise.
+ */
+int oidc_add_bearer(CURL *curl, struct json_object *token)
+{
+	struct json_object *bearer;
+
+	return json_object_object_get_ex(token, "authorization", &bearer)
+		&& curl_wrap_add_header_value(curl, "authorization", json_object_get_string(bearer));
+}
+
+