/*
- * Copyright (c) 2012, JANET(UK)
+ * Copyright (c) 2012, 2015, JANET(UK)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
#include <stdlib.h>
#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <sys/socket.h>
-#include <netinet/in.h>
+#include <sys/wait.h>
+#include <netdb.h>
#include <jansson.h>
-
+#include <talloc.h>
+#include <poll.h>
+#include <tid_internal.h>
#include <gsscon.h>
-#include <trust_router/tid.h>
-
+#include <tr_debug.h>
+#include <tr_msg.h>
+#include <tr_socket.h>
+#include <tr_gss.h>
+#include <tr_event.h>
-static int tids_listen (int port)
+static TID_RESP *tids_create_response(TALLOC_CTX *mem_ctx, TIDS_INSTANCE *tids, TID_REQ *req)
{
- int rc = 0;
- int conn = -1;
- struct sockaddr_storage addr;
- struct sockaddr_in *saddr = (struct sockaddr_in *) &addr;
-
- saddr->sin_port = htons (port);
- saddr->sin_family = AF_INET;
- saddr->sin_addr.s_addr = INADDR_ANY;
-
- if (0 > (conn = socket (AF_INET, SOCK_STREAM, 0)))
- return conn;
-
- if (0 > (rc = bind (conn, (struct sockaddr *) saddr, sizeof(struct sockaddr_in))))
- return rc;
-
- if (0 > (rc = listen(conn, 512)))
- return rc;
-
- fprintf (stdout, "TID Server listening on port %d\n", port);
- return conn;
+ TID_RESP *resp=NULL;
+ int success=0;
+
+ if (NULL == (resp = tid_resp_new(mem_ctx))) {
+ tr_crit("tids_create_response: Error allocating response structure.");
+ return NULL;
+ }
+
+ resp->result = TID_SUCCESS; /* presume success */
+ if ((NULL == (resp->rp_realm = tr_dup_name(req->rp_realm))) ||
+ (NULL == (resp->realm = tr_dup_name(req->realm))) ||
+ (NULL == (resp->comm = tr_dup_name(req->comm)))) {
+ tr_crit("tids_create_response: Error allocating fields in response.");
+ goto cleanup;
+ }
+ if (req->orig_coi) {
+ if (NULL == (resp->orig_coi = tr_dup_name(req->orig_coi))) {
+ tr_crit("tids_create_response: Error allocating fields in response.");
+ goto cleanup;
+ }
+ }
+
+ success=1;
+
+cleanup:
+ if ((!success) && (resp!=NULL)) {
+ talloc_free(resp);
+ resp=NULL;
+ }
+ return resp;
}
-static int tids_auth_connection (int conn, gss_ctx_id_t *gssctx)
+static int tids_handle_request(TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
{
- int rc = 0;
- int auth, autherr = 0;
-
- if (rc = gsscon_passive_authenticate(conn, gssctx)) {
- fprintf(stderr, "Error from gsscon_passive_authenticate(), rc = %d.\n", rc);
+ int rc=-1;
+
+ /* Check that this is a valid TID Request. If not, send an error return. */
+ if ((!req) ||
+ (!(req->rp_realm)) ||
+ (!(req->realm)) ||
+ (!(req->comm))) {
+ tr_notice("tids_handle_request(): Not a valid TID Request.");
+ resp->result = TID_ERROR;
+ resp->err_msg = tr_new_name("Bad request format");
return -1;
}
- if (rc = gsscon_authorize(*gssctx, &auth, &autherr)) {
- fprintf(stderr, "Error from gsscon_authorize, rc = %d, autherr = %d.\n",
- rc, autherr);
- return -1;
+ tr_debug("tids_handle_request: adding self to req path.");
+ tid_req_add_path(req, tids->hostname, tids->tids_port);
+
+ /* Call the caller's request handler */
+ /* TBD -- Handle different error returns/msgs */
+ if (0 > (rc = (*tids->req_handler)(tids, req, resp, tids->cookie))) {
+ /* set-up an error response */
+ tr_debug("tids_handle_request: req_handler returned error.");
+ resp->result = TID_ERROR;
+ if (!resp->err_msg) /* Use msg set by handler, if any */
+ resp->err_msg = tr_new_name("Internal processing error");
+ }
+ else {
+ /* set-up a success response */
+ tr_debug("tids_handle_request: req_handler returned success.");
+ resp->result = TID_SUCCESS;
+ resp->err_msg = NULL; /* No error msg on successful return */
}
+
+ return rc;
+}
- if (auth)
- fprintf(stdout, "Connection authenticated, conn = %d.\n", conn);
- else
- fprintf(stderr, "Authentication failed, conn %d.\n", conn);
+/**
+ * Produces a JSON-encoded msg containing the TID response
+ *
+ * @param mem_ctx talloc context for the return value
+ * @param tids TIDS_INSTANCE handling the request
+ * @param req incoming request
+ * @param resp outgoing response
+ * @return JSON-encoded message containing the TID response
+ */
+static char *tids_encode_response(TALLOC_CTX *mem_ctx, TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
+{
+ TR_MSG mresp;
+ char *resp_buf = NULL;
+
+ /* Construct the response message */
+ mresp.msg_type = TID_RESPONSE;
+ tr_msg_set_resp(&mresp, resp);
+
+ /* Encode the message to JSON */
+ resp_buf = tr_msg_encode(mem_ctx, &mresp);
+ if (resp_buf == NULL) {
+ tr_err("tids_encode_response: Error encoding json response.");
+ return NULL;
+ }
+ tr_debug("tids_encode_response: Encoded response: %s", resp_buf);
- return auth;
+ /* Success */
+ return resp_buf;
}
-static int tids_read_request (int conn, gss_ctx_id_t *gssctx, TID_REQ *req)
-{
- int err;
- char *buf;
- size_t buflen = 0;
+/**
+ * Encode/send an error response
+ *
+ * Part of the public interface
+ *
+ * @param tids
+ * @param req
+ * @param err_msg
+ * @return
+ */
+int tids_send_err_response (TIDS_INSTANCE *tids, TID_REQ *req, const char *err_msg) {
+ TID_RESP *resp = NULL;
+ int rc = 0;
- if (err = gsscon_read_encrypted_token(conn, *gssctx, &buf, &buflen)) {
- if (buf)
- free(buf);
+ if ((!tids) || (!req) || (!err_msg)) {
+ tr_debug("tids_send_err_response: Invalid parameters.");
return -1;
}
- fprintf(stdout, "Request Received, %u bytes.\n", (unsigned) buflen);
+ /* If we already sent a response, don't send another no matter what. */
+ if (req->resp_sent)
+ return 0;
- /* Parse request -- TBD */
+ if (NULL == (resp = tids_create_response(req, tids, req))) {
+ tr_crit("tids_send_err_response: Can't create response.");
+ return -1;
+ }
- if (buf)
- free(buf);
+ /* mark this as an error response, and include the error message */
+ resp->result = TID_ERROR;
+ resp->err_msg = tr_new_name((char *)err_msg);
+ resp->error_path = req->path;
- return buflen;
-}
+ rc = tids_send_response(tids, req, resp);
-static int tids_handle_request (TID_REQ *req, TID_RESP *resp)
-{
- return 0;
+ tid_resp_free(resp);
+ return rc;
}
-static int tids_send_response (int conn, gss_ctx_id_t *gssctx, TID_RESP *resp)
+/**
+ * Encode/send a response
+ *
+ * Part of the public interface
+ *
+ * @param tids
+ * @param req
+ * @param resp
+ * @return
+ */
+int tids_send_response (TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
{
- json_t *jreq;
int err;
char *resp_buf;
- /* Create a json TID response */
- if (NULL == (jreq = json_object())) {
- fprintf(stderr,"Error creating json object.\n");
+ if ((!tids) || (!req) || (!resp)) {
+ tr_debug("tids_send_response: Invalid parameters.");
return -1;
}
- if (0 > (err = json_object_set_new(jreq, "type", json_string("tid_response")))) {
- fprintf(stderr, "Error adding type to response.\n");
- return -1;
- }
- if (0 > (err = json_object_set_new(jreq, "result", json_string("error")))) {
- fprintf(stderr, "Error adding result to response.\n");
- return -1;
- }
- if (0 > (err = json_object_set_new(jreq, "msg", json_string("No path to realm")))) {
- fprintf(stderr, "Error adding msg to response.\n");
- return -1;
- }
+ /* Never send a second response if we already sent one. */
+ if (req->resp_sent)
+ return 0;
- /* Encode the json response */
- if (NULL == (resp_buf = json_dumps(jreq, 0))) {
- fprintf(stderr, "Error encoding json response.\n");
+ resp_buf = tids_encode_response(NULL, tids, req, resp);
+ if (resp_buf == NULL) {
+ tr_err("tids_send_response: Error encoding json response.");
+ tr_audit_req(req);
return -1;
}
-
- printf("Encoded response:\n%s\n", resp_buf);
-
- /* Send the request over the connection */
- if (err = gsscon_write_encrypted_token (conn, *gssctx, resp_buf,
- strlen(resp_buf) + 1)) {
- fprintf(stderr, "Error sending request over connection.\n");
+
+ tr_debug("tids_send_response: Encoded response: %s", resp_buf);
+
+ /* If external logging is enabled, fire off a message */
+ /* TODO Can be moved to end once segfault in gsscon_write_encrypted_token fixed */
+ tr_audit_resp(resp);
+
+ /* Send the response over the connection */
+ err = gsscon_write_encrypted_token (req->conn, req->gssctx, resp_buf,
+ strlen(resp_buf) + 1);
+ if (err) {
+ tr_notice("tids_send_response: Error sending response over connection.");
+ tr_audit_req(req);
return -1;
}
+ /* indicate that a response has been sent for this request */
+ req->resp_sent = 1;
+
free(resp_buf);
return 0;
-
}
-static void tids_handle_connection (int conn)
+/**
+ * Callback to process a request and produce a response
+ *
+ * @param req_str JSON-encoded request
+ * @param data pointer to a TIDS_INSTANCE
+ * @return pointer to the response string or null to send no response
+ */
+static char *tids_req_cb(TALLOC_CTX *mem_ctx, const char *req_str, void *data)
{
- TID_REQ req;
- TID_RESP resp;
- int rc;
- gss_ctx_id_t gssctx = GSS_C_NO_CONTEXT;
+ TIDS_INSTANCE *tids = talloc_get_type_abort(data, TIDS_INSTANCE);
+ TR_MSG *mreq = NULL;
+ TID_REQ *req = NULL;
+ TID_RESP *resp = NULL;
+ char *resp_str = NULL;
+ int rc = 0;
- if (!tids_auth_connection(conn, &gssctx)) {
- fprintf(stderr, "Error authorizing TID Server connection, rc = %d.\n", rc);
- close(conn);
- return;
+ mreq = tr_msg_decode(req_str, strlen(req_str)); // allocates memory on success!
+ if (mreq == NULL) {
+ tr_debug("tids_req_cb: Error decoding request.");
+ return NULL;
}
- printf("Connection authorized!\n");
+ /* If this isn't a TID Request, just drop it. */
+ if (mreq->msg_type != TID_REQUEST) {
+ tr_msg_free_decoded(mreq);
+ tr_debug("tids_req_cb: Not a TID request, dropped.");
+ return NULL;
+ }
- while (1) { /* continue until an error breaks us out */
+ /* Get a handle on the request itself. Don't free req - it belongs to mreq */
+ req = tr_msg_get_req(mreq);
+
+ /* Allocate a response structure and populate common fields. The resp is in req's talloc context,
+ * which will be cleaned up when mreq is freed. */
+ resp = tids_create_response(req, tids, req);
+ if (resp == NULL) {
+ /* If we were unable to create a response, we cannot reply. Log an
+ * error if we can, then drop the request. */
+ tr_msg_free_decoded(mreq);
+ tr_crit("tids_req_cb: Error creating response structure.");
+ return NULL;
+ }
- if (0 > (rc = tids_read_request(conn, &gssctx, &req))) {
- fprintf(stderr, "Error from tids_read_request(), rc = %d.\n", rc);
- return;
- } else if (0 == rc) {
- continue;
- }
+ /* Handle the request and fill in resp */
+ rc = tids_handle_request(tids, req, resp);
+ if (rc < 0) {
+ tr_debug("tids_req_cb: Error from tids_handle_request(), rc = %d.", rc);
+ /* Fall through, to send the response, either way */
+ }
- if (0 > (rc = tids_handle_request(&req, &resp))) {
- fprintf(stderr, "Error from tids_handle_request(), rc = %d.\n", rc);
- return;
- }
+ /* Convert the completed response into an encoded response */
+ resp_str = tids_encode_response(mem_ctx, tids, req, resp);
+
+ /* Finished; free the request and return */
+ tr_msg_free_decoded(mreq); // this frees req and resp, too
+ return resp_str;
+}
- if (0 > (rc = tids_send_response(conn, &gssctx, &resp))) {
- fprintf(stderr, "Error from tids_send_response(), rc = %d.\n", rc);
- return;
+TIDS_INSTANCE *tids_new(TALLOC_CTX *mem_ctx)
+{
+ return talloc_zero(mem_ctx, TIDS_INSTANCE);
+}
+
+/**
+ * Create a new TIDS instance
+ *
+ * Deprecated: exists for ABI compatibility, but tids_new() should be used instead
+ *
+ */
+TIDS_INSTANCE *tids_create(void)
+{
+ return talloc_zero(NULL, TIDS_INSTANCE);
+}
+/* Get a listener for tids requests, returns its socket fd. Accept
+ * connections with tids_accept() */
+nfds_t tids_get_listener(TIDS_INSTANCE *tids,
+ TIDS_REQ_FUNC *req_handler,
+ tids_auth_func *auth_handler,
+ const char *hostname,
+ unsigned int port,
+ void *cookie,
+ int *fd_out,
+ size_t max_fd)
+{
+ nfds_t n_fd = 0;
+ nfds_t ii = 0;
+
+ tids->tids_port = port;
+ n_fd = tr_sock_listen_all(port, fd_out, max_fd);
+
+ if (n_fd == 0)
+ tr_err("tids_get_listener: Error opening port %d");
+ else {
+ /* opening port succeeded */
+ tr_info("tids_get_listener: Opened port %d.", port);
+
+ /* make this socket non-blocking */
+ for (ii=0; ii<n_fd; ii++) {
+ if (0 != fcntl(fd_out[ii], F_SETFL, O_NONBLOCK)) {
+ tr_err("tids_get_listener: Error setting O_NONBLOCK.");
+ for (ii=0; ii<n_fd; ii++) {
+ close(fd_out[ii]);
+ fd_out[ii]=-1;
+ }
+ n_fd = 0;
+ break;
+ }
}
- }
+ }
+
+ if (n_fd > 0) {
+ /* store the caller's request handler & cookie */
+ tids->req_handler = req_handler;
+ tids->auth_handler = auth_handler;
+ tids->hostname = hostname;
+ tids->cookie = cookie;
+ }
- return;
+ return (int)n_fd;
}
-TIDS_INSTANCE *tids_create (void)
+/* Accept and process a connection on a port opened with tids_get_listener() */
+int tids_accept(TIDS_INSTANCE *tids, int listen)
{
- TIDS_INSTANCE *tids = 0;
- if (tids = malloc(sizeof(TIDS_INSTANCE)))
- memset(tids, 0, sizeof(TIDS_INSTANCE));
- return tids;
+ int conn=-1;
+ int pid=-1;
+
+ if (0 > (conn = accept(listen, NULL, NULL))) {
+ perror("Error from TIDS Server accept()");
+ return 1;
+ }
+
+ if (0 > (pid = fork())) {
+ perror("Error on fork()");
+ return 1;
+ }
+
+ if (pid == 0) {
+ close(listen);
+ tr_gss_handle_connection(conn,
+ "trustidentity", tids->hostname, /* acceptor name */
+ tids->auth_handler, tids->cookie, /* auth callback and cookie */
+ tids_req_cb, tids /* req callback and cookie */
+ );
+ close(conn);
+ exit(0); /* exit to kill forked child process */
+ } else {
+ close(conn);
+ }
+
+ /* clean up any processes that have completed (TBD: move to main loop?) */
+ while (waitpid(-1, 0, WNOHANG) > 0);
+
+ return 0;
}
-int tids_start (TIDS_INSTANCE *tids,
- TIDS_REQ_FUNC *req_handler,
- void *cookie)
+/* Process tids requests forever. Should not return except on error. */
+int tids_start (TIDS_INSTANCE *tids,
+ TIDS_REQ_FUNC *req_handler,
+ tids_auth_func *auth_handler,
+ const char *hostname,
+ unsigned int port,
+ void *cookie)
{
- int listen = -1;
- int conn = -1;
- pid_t pid;
+ int fd[TR_MAX_SOCKETS]={0};
+ nfds_t n_fd=0;
+ struct pollfd poll_fd[TR_MAX_SOCKETS]={{0}};
+ int ii=0;
- if (0 > (listen = tids_listen(TID_PORT)))
+ n_fd = tids_get_listener(tids, req_handler, auth_handler, hostname, port, cookie, fd, TR_MAX_SOCKETS);
+ if (n_fd <= 0) {
perror ("Error from tids_listen()");
+ return 1;
+ }
+
+ tr_info("Trust Path Query Server starting on host %s:%d.", hostname, port);
+
+ /* set up the poll structs */
+ for (ii=0; ii<n_fd; ii++) {
+ poll_fd[ii].fd=fd[ii];
+ poll_fd[ii].events=POLLIN;
+ }
while(1) { /* accept incoming conns until we are stopped */
+ /* clear out events from previous iteration */
+ for (ii=0; ii<n_fd; ii++)
+ poll_fd[ii].revents=0;
- if (0 > (conn = accept(listen, NULL, NULL))) {
- perror("Error from TIDS Server accept()");
+ /* wait indefinitely for a connection */
+ if (poll(poll_fd, n_fd, -1) < 0) {
+ perror("Error from poll()");
return 1;
}
- if (0 > (pid = fork())) {
- perror("Error on fork()");
- return 1;
- }
+ /* fork handlers for any sockets that have data */
+ for (ii=0; ii<n_fd; ii++) {
+ if (poll_fd[ii].revents == 0)
+ continue;
+
+ if ((poll_fd[ii].revents & POLLERR) || (poll_fd[ii].revents & POLLNVAL)) {
+ perror("Error polling fd");
+ continue;
+ }
- if (pid == 0) {
- close(listen);
- tids_handle_connection(conn);
- close(conn);
- exit(0);
- } else {
- close(conn);
+ if (poll_fd[ii].revents & POLLIN) {
+ if (tids_accept(tids, poll_fd[ii].fd))
+ tr_err("tids_start: error in tids_accept().");
+ }
}
}
- return 1; /* should never get here */
+ return 1; /* should never get here, loops "forever" */
}
void tids_destroy (TIDS_INSTANCE *tids)
{
- free(tids);
-}
-
+ /* clean up logfiles */
+ tr_log_close();
+ if (tids)
+ free(tids);
+}
projects / trust_router.git / blobdiff