first somewhat working version.

Change-Id: I3101dc6b8add87eccac3bbf177b1320137f72463
Signed-off-by: Loïc Collignon <loic.collignon@iot.bzh>

3 files changed, 230 insertions, 0 deletions

diff --git a/ll-auth-binding/src/CMakeLists.txt b/ll-auth-binding/src/CMakeLists.txt
new file mode 100644
index 0000000..2b682bd
--- /dev/null
+++ b/ll-auth-binding/src/CMakeLists.txt
@@ -0,0 +1,21 @@
+PROJECT_TARGET_ADD(ll-auth-binding)
+
+# Require PAM but there is no find_package
+set(PAM_INCLUDE_DIR "/usr/include/")
+set(PAM_LIBRARY "/lib64/libpam.so.0")
+set(PAM_MISC_LIBRARY "/lib64/libpam_misc.so.0")
+include_directories(${PAM_INCLUDE_DIR})
+
+add_library(ll-auth-binding MODULE ll-auth-binding.c)
+
+set_target_properties(ll-auth-binding PROPERTIES
+	PREFIX "afb-"
+	LABELS "BINDING"
+	LINK_FLAGS ${BINDINGS_LINK_FLAG}
+	OUTPUT_NAME ${TARGET_NAME})
+
+target_link_libraries(ll-auth-binding ${link_libraries} ${PAM_LIBRARY} ${PAM_MISC_LIBRARY})
+
+install(
+	TARGETS ll-auth-binding
+	LIBRARY DESTINATION ${BINDINGS_INSTALL_DIR})
diff --git a/ll-auth-binding/src/export.map b/ll-auth-binding/src/export.map
new file mode 100644
index 0000000..ee2f413
--- /dev/null
+++ b/ll-auth-binding/src/export.map
@@ -0,0 +1 @@
+{ global: afbBindingV*; local: *; };
diff --git a/ll-auth-binding/src/ll-auth-binding.c b/ll-auth-binding/src/ll-auth-binding.c
new file mode 100644
index 0000000..e85d63a
--- /dev/null
+++ b/ll-auth-binding/src/ll-auth-binding.c
@@ -0,0 +1,208 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <string.h>
+#include <json-c/json.h>
+#include <security/pam_appl.h>
+#include <security/pam_misc.h>
+
+#define AFB_BINDING_VERSION 2
+#include <afb/afb-binding.h>
+
+static struct pam_conv conv = { misc_conv, NULL };
+
+static char* current_device = NULL;
+static char* current_user = NULL;
+
+afb_event evt_login, evt_logout;
+
+/// @brief API's verb 'login'. Try to login a user using a device
+/// @param[in] req The request object. Should contains a json with a "device" key.
+static void verb_login(struct afb_req req)
+{
+	struct json_object* args = NULL;
+	struct json_object* device_object = NULL;
+	pam_handle_t* pamh;
+	int r;
+
+	if (current_user)
+	{
+		AFB_ERROR("[login] the current user must be logged out first!");
+		afb_req_fail(req, "current user must be logged out first!", NULL);
+		return;
+	}
+
+	args = afb_req_json(req);
+	if (args == NULL || !json_object_object_get_ex(args, "device", &device_object))
+	{
+		AFB_ERROR("[login] device must be provided!");
+		afb_req_fail(req, "device must be provided!", NULL);
+		return;
+	}
+
+	const char* device = json_object_get_string(device_object);
+
+	if ((r = pam_start("agl", NULL, &conv, &pamh)) != PAM_SUCCESS)
+	{
+		AFB_ERROR("PAM start failed!");
+		afb_req_fail(req, "PAM start failed!", NULL);
+		return;
+	}
+
+	char pam_variable[4096] = "DEVICE=";
+	strcat(pam_variable, device);
+	
+	if ((r = pam_putenv(pamh, pam_variable)) != PAM_SUCCESS)
+	{
+		AFB_ERROR("PAM putenv failed!");
+		afb_req_fail(req, "PAM putenv failed!", NULL);
+		pam_end(pamh, r);
+		return;
+	}
+
+	if ((r = pam_authenticate(pamh, 0)) != PAM_SUCCESS)
+	{
+		AFB_ERROR("PAM authenticate failed!");
+		afb_req_fail(req, "PAM authenticate failed!", NULL);
+		pam_end(pamh, r);
+		return;
+	}
+
+	if ((r = pam_acct_mgmt(pamh, 0)) != PAM_SUCCESS)
+	{
+		AFB_ERROR("PAM acct_mgmt failed!");
+		afb_req_fail(req, "PAM acct_mgmt failed!", NULL);
+		pam_end(pamh, r);
+		return;
+	}
+
+	const char* pam_user;
+	pam_get_item(pamh, PAM_USER, (const void**)&pam_user);
+	if (!pam_user)
+	{
+		AFB_ERROR("[login] No user provided by the PAM module!");
+		afb_req_fail(req, "No user provided by the PAM module!", NULL);
+		return;
+	}
+
+	current_device = strdup(device);
+	current_user = strdup(pam_user);
+
+	if ((r = pam_end(pamh, r)) != PAM_SUCCESS)
+	{
+		AFB_ERROR("PAM end failed!");
+		afb_req_fail(req, "PAM end failed!", NULL);
+		return;
+	}
+
+	AFB_INFO("[login] device: %s, user: %s", current_device, current_user);
+	json_object* result = json_object_new_object();
+	json_object_object_add(result, "device", json_object_new_string(current_device));
+	json_object_object_add(result, "user", json_object_new_string(current_user));
+	afb_req_success(req, NULL, current_device);
+	afb_event_broadcast(evt_login, result);
+}
+
+/// @brief API's verb 'lgout'. Try to logout a user using a device
+/// @param[in] req The request object. Should contains a json with a "device" key.
+static void verb_logout(struct afb_req req)
+{
+	struct json_object* args = NULL;
+	struct json_object* device_object = NULL;
+
+	args = afb_req_json(req);
+	if (args == NULL || !json_object_object_get_ex(args, "device", &device_object))
+	{
+		AFB_INFO("[logout] device must be provided!");
+		afb_req_fail(req, "device must be provided!", NULL);
+		return;
+	}
+
+	const char* device = json_object_get_string(device_object);
+	if (current_device && !strcmp(device, current_device))
+	{
+		free(current_device);
+		current_device = NULL;
+		if (current_user)
+		{
+			free(current_user);
+			current_user = NULL;
+			AFB_INFO("[logout] device: %s", device);
+			afb_req_success(req, NULL, device);
+			afb_event_broadcast(evt_logout, NULL);
+			return;
+		}
+		else
+		{
+			AFB_INFO("No user was linked to this device!");
+			afb_req_fail(req, "No user was linked to this device!", NULL);
+			return;
+		}
+	}
+
+	AFB_INFO("The unplugged device wasn't the user key!");
+	afb_req_fail(req, "The unplugged device wasn't the user key!", NULL);
+}
+
+static void verb_getuser(struct afb_req req)
+{
+	if (!current_device || !current_user)
+	{
+		afb_req_fail(req, "there is no logged user!", NULL);
+		return;
+	}
+
+	json_object* result = json_object_new_object();
+	json_object_object_add(result, "user", json_object_new_string(current_user));
+	json_object_object_add(result, "device", json_object_new_string(current_device));
+
+	afb_req_success(req, result, NULL);
+}
+
+int ll_auth_init()
+{
+	current_user = NULL;
+	current_device = NULL;
+	evt_login = afb_daemon_make_event("login");
+	evt_logout = afb_daemon_make_event("logout");
+
+	if (afb_event_is_valid(evt_login) && afb_event_is_valid(evt_logout))
+		return 0;
+
+	AFB_ERROR("Can't create events");
+		return -1;
+}
+
+static const afb_verb_v2 _ll_auth_binding_verbs[]= {
+	{
+		.verb = "login",
+		.callback = verb_login,
+		.auth = NULL,
+		.info = NULL,
+		.session = AFB_SESSION_NONE_V2
+	},
+	{
+		.verb = "logout",
+		.callback = verb_logout,
+		.auth = NULL,
+		.info = NULL,
+		.session = AFB_SESSION_NONE_V2
+	},
+	{
+		.verb = "getuser",
+		.callback = verb_getuser,
+		.auth = NULL,
+		.info = NULL,
+		.session = AFB_SESSION_NONE_V2
+	},
+	{ .verb=NULL}
+};
+
+const struct afb_binding_v2 afbBindingV2 = {
+		.api = "ll-auth",
+		.specification = NULL,
+		.verbs = _ll_auth_binding_verbs,
+		.preinit = ll_auth_init,
+		.init = NULL,
+		.onevent = NULL,
+		.noconcurrency = 0
+};