/*
- * 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 <assert.h>
#include <stdlib.h>
#include <unistd.h>
+#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <sys/socket.h>
+#include <sys/wait.h>
#include <netinet/in.h>
#include <jansson.h>
-
-#include <trust_router/tid.h>
+#include <talloc.h>
+#include <tid_internal.h>
#include <gsscon.h>
+#include <tr_debug.h>
#include <tr_msg.h>
+static TID_RESP *tids_create_response (TIDS_INSTANCE *tids, TID_REQ *req)
+{
+ TID_RESP *resp;
+
+ if ((NULL == (resp = talloc_zero(req, TID_RESP)))) {
+ 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.");
+ return NULL;
+ }
+ 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.");
+ return NULL;
+ }
+ }
+ return resp;
+}
+
+static void tids_destroy_response(TIDS_INSTANCE *tids, TID_RESP *resp)
+{
+ if (resp) {
+ if (resp->err_msg)
+ tr_free_name(resp->err_msg);
+ if (resp->rp_realm)
+ tr_free_name(resp->rp_realm);
+ if (resp->realm)
+ tr_free_name(resp->realm);
+ if (resp->comm)
+ tr_free_name(resp->comm);
+ if (resp->orig_coi)
+ tr_free_name(resp->orig_coi);
+ talloc_free(resp);
+ }
+}
+
static int tids_listen (TIDS_INSTANCE *tids, int port)
{
int rc = 0;
int conn = -1;
- struct sockaddr_storage addr;
- struct sockaddr_in *saddr = (struct sockaddr_in *) &addr;
-
+ int optval = 1;
+
+ union {
+ struct sockaddr_storage storage;
+ struct sockaddr_in in4;
+ } addr;
+
+ struct sockaddr_in *saddr = (struct sockaddr_in *) &addr.in4;
+
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;
-
+
+ setsockopt(conn, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval));
+
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;
+
+ tr_debug("tids_listen: TID Server listening on port %d", port);
+ return conn;
}
-static int tids_auth_connection (int conn, gss_ctx_id_t *gssctx)
+/* returns EACCES if authorization is denied */
+static int tids_auth_cb(gss_name_t clientName, gss_buffer_t displayName,
+ void *data)
+{
+ struct tids_instance *inst = (struct tids_instance *) data;
+ TR_NAME name ={(char *) displayName->value,
+ displayName->length};
+ int result=0;
+
+ if (0!=inst->auth_handler(clientName, &name, inst->cookie)) {
+ tr_debug("tids_auth_cb: client '%.*s' denied authorization.", name.len, name.buf);
+ result=EACCES; /* denied */
+ }
+
+ return result;
+}
+
+/* returns 0 on authorization success, 1 on failure, or -1 in case of error */
+static int tids_auth_connection (struct tids_instance *inst,
+ int conn, gss_ctx_id_t *gssctx)
{
int rc = 0;
int auth, autherr = 0;
+ gss_buffer_desc nameBuffer = {0, NULL};
+ char *name = 0;
+ int nameLen = 0;
- if (rc = gsscon_passive_authenticate(conn, gssctx)) {
- fprintf(stderr, "Error from gsscon_passive_authenticate(), rc = %d.\n", rc);
+ nameLen = asprintf(&name, "trustidentity@%s", inst->hostname);
+ nameBuffer.length = nameLen;
+ nameBuffer.value = name;
+
+ if (rc = gsscon_passive_authenticate(conn, nameBuffer, gssctx, tids_auth_cb, inst)) {
+ tr_debug("tids_auth_connection: Error from gsscon_passive_authenticate(), rc = %d.", rc);
return -1;
}
if (rc = gsscon_authorize(*gssctx, &auth, &autherr)) {
- fprintf(stderr, "Error from gsscon_authorize, rc = %d, autherr = %d.\n",
+ tr_debug("tids_auth_connection: Error from gsscon_authorize, rc = %d, autherr = %d.",
rc, autherr);
return -1;
}
if (auth)
- fprintf(stdout, "Connection authenticated, conn = %d.\n", conn);
+ tr_debug("tids_auth_connection: Connection authenticated, conn = %d.", conn);
else
- fprintf(stderr, "Authentication failed, conn %d.\n", conn);
+ tr_debug("tids_auth_connection: Authentication failed, conn %d.", conn);
- return auth;
+ return !auth;
}
static int tids_read_request (TIDS_INSTANCE *tids, int conn, gss_ctx_id_t *gssctx, TR_MSG **mreq)
return -1;
}
- fprintf(stdout, "tids_read_request():Request Received, %d bytes.\n", buflen);
+ tr_debug("tids_read_request():Request Received, %u bytes.", (unsigned) buflen);
/* Parse request */
if (NULL == ((*mreq) = tr_msg_decode(buf, buflen))) {
- printf("tids_read_request():Error decoding request.\n");
+ tr_debug("tids_read_request():Error decoding request.");
free (buf);
return -1;
}
/* If this isn't a TID Request, just drop it. */
if (TID_REQUEST != (*mreq)->msg_type) {
- printf("tids_read_request(): Not a TID Request, dropped.\n");
+ tr_debug("tids_read_request(): Not a TID Request, dropped.");
return -1;
}
return buflen;
}
-static int tids_handle_request (TIDS_INSTANCE *tids, TR_MSG *mreq, TID_RESP **resp)
+static int tids_handle_request (TIDS_INSTANCE *tids, TR_MSG *mreq, TID_RESP *resp)
{
int rc;
/* Check that this is a valid TID Request. If not, send an error return. */
- if ((!mreq->tid_req) ||
- (!mreq->tid_req->rp_realm) ||
- (!mreq->tid_req->realm) ||
- (!mreq->tid_req->comm)) {
- printf("tids_handle_request():Not a valid TID Request.\n");
- (*resp)->result = TID_ERROR;
- (*resp)->err_msg = tr_new_name("Bad request format");
+ if ((!tr_msg_get_req(mreq)) ||
+ (!tr_msg_get_req(mreq)->rp_realm) ||
+ (!tr_msg_get_req(mreq)->realm) ||
+ (!tr_msg_get_req(mreq)->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;
}
+ tid_req_add_path(tr_msg_get_req(mreq), tids->hostname, tids->tids_port);
+
/* Call the caller's request handler */
/* TBD -- Handle different error returns/msgs */
- if (0 > (rc = (*tids->req_handler)(tids, mreq->tid_req, &(*resp), tids->cookie))) {
+ if (0 > (rc = (*tids->req_handler)(tids, tr_msg_get_req(mreq), resp, tids->cookie))) {
/* set-up an error response */
- (*resp)->result = TID_ERROR;
- if (!(*resp)->err_msg) /* Use msg set by handler, if any */
- (*resp)->err_msg = tr_new_name("Internal processing 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 */
- (*resp)->result = TID_SUCCESS;
- (*resp)->err_msg = NULL; /* No msg on successful return */
+ resp->result = TID_SUCCESS;
+ resp->err_msg = NULL; /* No error msg on successful return */
}
return rc;
}
-int tids_send_response (TIDS_INSTANCE *tids, int conn, gss_ctx_id_t *gssctx, TID_RESP *resp)
+int tids_send_err_response (TIDS_INSTANCE *tids, TID_REQ *req, const char *err_msg) {
+ TID_RESP *resp = NULL;
+ int rc = 0;
+
+ /* If we already sent a response, don't send another no matter what. */
+ if (req->resp_sent)
+ return 0;
+
+ if (NULL == (resp = tids_create_response(tids, req))) {
+ tr_crit("tids_send_err_response: Can't create response.");
+ return -1;
+ }
+
+
+ /* 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;
+
+ rc = tids_send_response(tids, req, resp);
+
+ tids_destroy_response(tids, resp);
+ return rc;
+}
+
+int tids_send_response (TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
{
int err;
TR_MSG mresp;
char *resp_buf;
+ if ((!tids) || (!req) || (!resp))
+ tr_debug("tids_send_response: Invalid parameters.");
+
+ /* Never send a second response if we already sent one. */
+ if (req->resp_sent)
+ return 0;
+
mresp.msg_type = TID_RESPONSE;
- mresp.tid_resp = resp;
-
+ tr_msg_set_resp(&mresp, resp);
+
if (NULL == (resp_buf = tr_msg_encode(&mresp))) {
- fprintf(stderr, "Error decoding json response.\n");
+
+ fprintf(stderr, "tids_send_response: Error encoding json response.\n");
+ tr_audit_req(req);
+
return -1;
}
- printf("Encoded response:\n%s\n", resp_buf);
-
+ 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 */
- if (err = gsscon_write_encrypted_token (conn, *gssctx, resp_buf,
+ if (err = gsscon_write_encrypted_token (req->conn, req->gssctx, resp_buf,
strlen(resp_buf) + 1)) {
- fprintf(stderr, "Error sending response over connection.\n");
+ 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;
int rc = 0;
gss_ctx_id_t gssctx = GSS_C_NO_CONTEXT;
- if (!tids_auth_connection(conn, &gssctx)) {
- fprintf(stderr, "Error authorizing TID Server connection.\n");
+ if (tids_auth_connection(tids, conn, &gssctx)) {
+ tr_notice("tids_handle_connection: Error authorizing TID Server connection.");
close(conn);
return;
}
- printf("Connection authorized!\n");
+ tr_debug("tids_handle_connection: Connection authorized!");
while (1) { /* continue until an error breaks us out */
if (0 > (rc = tids_read_request(tids, conn, &gssctx, &mreq))) {
- fprintf(stderr, "Error from tids_read_request(), rc = %d.\n", rc);
+ tr_debug("tids_handle_connection: Error from tids_read_request(), rc = %d.", rc);
return;
} else if (0 == rc) {
continue;
}
+ /* Put connection information into the request structure */
+ tr_msg_get_req(mreq)->conn = conn;
+ tr_msg_get_req(mreq)->gssctx = gssctx;
+
/* Allocate a response structure and populate common fields */
- if ((NULL == (resp = malloc(sizeof(TID_RESP))))) {
- fprintf(stderr, "Error allocating response structure.\n");
+ if (NULL == (resp = tids_create_response (tids, tr_msg_get_req(mreq)))) {
+ tr_crit("tids_handle_connection: Error creating response structure.");
+ /* try to send an error */
+ tids_send_err_response(tids, tr_msg_get_req(mreq), "Error creating response.");
return;
}
- /* TBD -- handle errors */
- resp->result = TID_SUCCESS; /* presume success */
- resp->rp_realm = tr_dup_name(mreq->tid_req->rp_realm);
- resp->realm = tr_dup_name(mreq->tid_req->realm);
- resp->comm = tr_dup_name(mreq->tid_req->comm);
- if (mreq->tid_req->orig_coi)
- resp->orig_coi = tr_dup_name(mreq->tid_req->orig_coi);
-
- if (0 > (rc = tids_handle_request(tids, mreq, &resp))) {
- fprintf(stderr, "Error from tids_handle_request(), rc = %d.\n", rc);
- return;
+ if (0 > (rc = tids_handle_request(tids, mreq, resp))) {
+ tr_debug("tids_handle_connection: Error from tids_handle_request(), rc = %d.", rc);
+ /* Fall through, to send the response, either way */
}
- if (0 > (rc = tids_send_response(tids, conn, &gssctx, resp))) {
- fprintf(stderr, "Error from tids_send_response(), rc = %d.\n", rc);
- return;
+ if (0 > (rc = tids_send_response(tids, tr_msg_get_req(mreq), resp))) {
+ tr_debug("tids_handle_connection: Error from tids_send_response(), rc = %d.", rc);
+ /* if we didn't already send a response, try to send a generic error. */
+ if (!tr_msg_get_req(mreq)->resp_sent)
+ tids_send_err_response(tids, tr_msg_get_req(mreq), "Error sending response.");
+ /* Fall through to free the response, either way. */
}
- }
-
- return;
+
+ tids_destroy_response(tids, resp);
+ return;
+ }
}
TIDS_INSTANCE *tids_create (void)
return tids;
}
+/* Get a listener for tids requests, returns its socket fd. Accept
+ * connections with tids_accept() */
+int 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 listen = -1;
+
+ tids->tids_port = port;
+ if (0 > (listen = tids_listen(tids, port))) {
+ char errbuf[256];
+ if (0 == strerror_r(errno, errbuf, 256)) {
+ tr_debug("tids_get_listener: Error opening port %d: %s.", port, errbuf);
+ } else {
+ tr_debug("tids_get_listener: Unknown error openining port %d.", port);
+ }
+ }
+
+ if (listen > 0) {
+ /* opening port succeeded */
+ tr_debug("tids_get_listener: Opened port %d.", port);
+
+ /* make this socket non-blocking */
+ if (0 != fcntl(listen, F_SETFD, O_NONBLOCK)) {
+ tr_debug("tids_get_listener: Error setting O_NONBLOCK.");
+ close(listen);
+ listen=-1;
+ }
+ }
+
+ if (listen > 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 listen;
+}
+
+/* Accept and process a connection on a port opened with tids_get_listener() */
+int tids_accept(TIDS_INSTANCE *tids, int listen)
+{
+ 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);
+ tids_handle_connection(tids, conn);
+ 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;
+}
+
+/* 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 optval = 1;
- if (0 > (listen = tids_listen(tids, TID_PORT)))
+ tids->tids_port = port;
+ if (0 > (listen = tids_listen(tids, port)))
perror ("Error from tids_listen()");
- setsockopt(listen, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval));
-
/* store the caller's request handler & cookie */
tids->req_handler = req_handler;
+ tids->auth_handler = auth_handler;
+ tids->hostname = hostname;
tids->cookie = cookie;
+ tr_info("Trust Path Query Server starting on host %s:%d.", hostname, port);
+
while(1) { /* accept incoming conns until we are stopped */
if (0 > (conn = accept(listen, NULL, NULL))) {
close(listen);
tids_handle_connection(tids, conn);
close(conn);
- exit(0);
+ exit(0); /* exit to kill forked child process */
} else {
close(conn);
}
+
+ /* clean up any processes that have completed */
+ while (waitpid(-1, 0, WNOHANG) > 0);
}
- 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