/*
- * 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 <talloc.h>
+#include <poll.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;
+ TID_RESP *resp=NULL;
+ int success=0;
- if ((NULL == (resp = talloc_zero(req, TID_RESP)))) {
- fprintf(stderr, "tids_create_response: Error allocating response structure.\n");
+ if (NULL == (resp = tid_resp_new(req))) {
+ tr_crit("tids_create_response: Error allocating response structure.");
return NULL;
}
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)))) {
- fprintf(stderr, "tids_create_response: Error allocating fields in response.\n");
- return NULL;
+ 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))) {
- fprintf(stderr, "tids_create_response: Error allocating fields in response.\n");
- return NULL;
+ tr_crit("tids_create_response: Error allocating fields in response.");
+ goto cleanup;
}
}
- 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);
+ success=1;
+
+cleanup:
+ if ((!success) && (resp!=NULL)) {
talloc_free(resp);
+ resp=NULL;
}
+ return resp;
}
-static int tids_listen (TIDS_INSTANCE *tids, int port)
+static int tids_listen(TIDS_INSTANCE *tids, int port, int *fd_out, size_t max_fd)
{
- int rc = 0;
- int conn = -1;
- int optval = 1;
+ int rc = 0;
+ int conn = -1;
+ int optval = 1;
+ struct addrinfo *ai=NULL;
+ struct addrinfo *ai_head=NULL;
+ struct addrinfo hints={.ai_flags=AI_PASSIVE,
+ .ai_family=AF_UNSPEC,
+ .ai_socktype=SOCK_STREAM,
+ .ai_protocol=IPPROTO_TCP};
+ char *port_str=NULL;
+ size_t n_opened=0;
+
+ tr_debug("tids_listen: started!");
+ port_str=talloc_asprintf(NULL, "%d", port);
+ if (port_str==NULL) {
+ tr_debug("tids_listen: unable to allocate port.");
+ return -1;
+ }
- union {
- struct sockaddr_storage storage;
- struct sockaddr_in in4;
- } addr;
+ tr_debug("getaddrinfo()=%d", getaddrinfo(NULL, port_str, &hints, &ai_head));
+ talloc_free(port_str);
+ tr_debug("tids_listen: got address info");
- 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, "tids_listen: TID Server listening on port %d\n", port);
- return conn;
+ /* TODO: listen on all ports */
+ for (ai=ai_head,n_opened=0; (ai!=NULL)&&(n_opened<max_fd); ai=ai->ai_next) {
+ if (0 > (conn = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol))) {
+ tr_debug("tids_listen: unable to open socket.");
+ continue;
+ }
+
+ optval=1;
+ if (0!=setsockopt(conn, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)))
+ tr_debug("tids_listen: unable to set SO_REUSEADDR."); /* not fatal? */
+
+ if (ai->ai_family==AF_INET6) {
+ /* don't allow IPv4-mapped IPv6 addresses (per RFC4942, not sure
+ * if still relevant) */
+ if (0!=setsockopt(conn, IPPROTO_IPV6, IPV6_V6ONLY, &optval, sizeof(optval))) {
+ tr_debug("tids_listen: unable to set IPV6_V6ONLY. Skipping interface.");
+ close(conn);
+ continue;
+ }
+ }
+
+ rc=bind(conn, ai->ai_addr, ai->ai_addrlen);
+ if (rc<0) {
+ tr_debug("tids_listen: unable to bind to socket.");
+ close(conn);
+ continue;
+ }
+
+ if (0>listen(conn, 512)) {
+ tr_debug("tids_listen: unable to listen on bound socket.");
+ close(conn);
+ continue;
+ }
+
+ /* ok, this one worked. Save it */
+ fd_out[n_opened++]=conn;
+ }
+ freeaddrinfo(ai_head);
+
+ if (n_opened==0) {
+ tr_debug("tids_listen: no addresses available for listening.");
+ return -1;
+ }
+
+ tr_debug("tids_listen: TRP Server listening on port %d on %d socket%s",
+ port,
+ n_opened,
+ (n_opened==1)?"":"s");
+
+ return n_opened;
}
+/* 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};
- return inst->auth_handler(clientName, &name, inst->cookie);
+ 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;
}
-static int tids_auth_connection (struct tids_instance *inst,
- int conn, gss_ctx_id_t *gssctx)
+/* returns 0 on authorization success, 1 on failure, or -1 in case of error */
+static int tids_auth_connection (TIDS_INSTANCE *inst,
+ int conn,
+ gss_ctx_id_t *gssctx)
{
int rc = 0;
int auth, autherr = 0;
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)) {
- fprintf(stderr, "tids_auth_connection: Error from gsscon_passive_authenticate(), rc = %d.\n", rc);
+ tr_debug("tids_auth_connection: Error from gsscon_passive_authenticate(), rc = %d.", rc);
+ free(name);
return -1;
}
+ free(name);
+ nameBuffer.value=NULL; nameBuffer.length=0;
if (rc = gsscon_authorize(*gssctx, &auth, &autherr)) {
- fprintf(stderr, "tids_auth_connection: 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, "tids_auth_connection: Connection authenticated, conn = %d.\n", conn);
+ tr_debug("tids_auth_connection: Connection authenticated, conn = %d.", conn);
else
- fprintf(stderr, "tids_auth_connection: Authentication failed, conn %d.\n", conn);
+ tr_debug("tids_auth_connection: Authentication failed, conn %d.", conn);
return !auth;
}
return -1;
}
- fprintf(stdout, "tids_read_request():Request Received, %u bytes.\n", (unsigned) buflen);
+ tr_debug("tids_read_request():Request Received, %u bytes.", (unsigned) buflen);
/* Parse request */
if (NULL == ((*mreq) = tr_msg_decode(buf, buflen))) {
- fprintf(stderr, "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) {
- fprintf(stderr, "tids_read_request(): Not a TID Request, dropped.\n");
+ tr_debug("tids_read_request(): Not a TID Request, dropped.");
return -1;
}
static int tids_handle_request (TIDS_INSTANCE *tids, TR_MSG *mreq, TID_RESP *resp)
{
- int rc;
+ int rc=-1;
/* 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)) {
- fprintf(stderr, "tids_handle_request():Not a valid TID Request.\n");
+ 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;
}
+ tr_debug("tids_handle_request: adding self to req path.");
+ 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 */
+ 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 0;
if (NULL == (resp = tids_create_response(tids, req))) {
- fprintf(stderr, "tids_send_err_response: Can't create response.\n");
+ 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);
+ tid_resp_free(resp);
return rc;
}
char *resp_buf;
if ((!tids) || (!req) || (!resp))
- fprintf (stderr, "tids_send_response: Invalid parameters.\n");
+ 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, "tids_send_response: Error encoding json response.\n");
+
+ tr_err("tids_send_response: Error encoding json response.");
+ tr_audit_req(req);
+
return -1;
}
- fprintf(stderr, "tids_send_response: 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 (req->conn, req->gssctx, resp_buf,
strlen(resp_buf) + 1)) {
- fprintf(stderr, "tids_send_response: Error sending response over connection.\n");
+ tr_notice("tids_send_response: Error sending response over connection.");
+
+ tr_audit_req(req);
+
return -1;
}
gss_ctx_id_t gssctx = GSS_C_NO_CONTEXT;
if (tids_auth_connection(tids, conn, &gssctx)) {
- fprintf(stderr, "tids_handle_connection: Error authorizing TID Server connection.\n");
+ tr_notice("tids_handle_connection: Error authorizing TID Server connection.");
close(conn);
return;
}
- fprintf(stdout, "tids_handle_connection: 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, "tids_handle_connection: 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 */
- mreq->tid_req->conn = conn;
- mreq->tid_req->gssctx = gssctx;
+ 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 = tids_create_response (tids, mreq->tid_req))) {
- fprintf(stderr, "tids_handle_connection: Error creating 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, mreq->tid_req, "Error creating response.\n");
+ tids_send_err_response(tids, tr_msg_get_req(mreq), "Error creating response.");
+ tr_msg_free_decoded(mreq);
return;
}
if (0 > (rc = tids_handle_request(tids, mreq, resp))) {
- fprintf(stderr, "tids_handle_connection: Error from tids_handle_request(), rc = %d.\n", rc);
+ 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, mreq->tid_req, resp))) {
- fprintf(stderr, "tids_handle_connection: Error from tids_send_response(), rc = %d.\n", rc);
+ 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 (!mreq->tid_req->resp_sent)
- tids_send_err_response(tids, mreq->tid_req, "Error sending response.\n");
+ 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. */
}
- tids_destroy_response(tids, resp);
+ tr_msg_free_decoded(mreq); /* takes resp with it */
return;
}
}
TIDS_INSTANCE *tids_create (void)
{
- TIDS_INSTANCE *tids = NULL;
- if (tids = malloc(sizeof(TIDS_INSTANCE)))
- memset(tids, 0, sizeof(TIDS_INSTANCE));
- return tids;
+ return talloc_zero(NULL, TIDS_INSTANCE);
+}
+
+/* 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 *fd_out,
+ size_t max_fd)
+{
+ size_t n_fd=0;
+ size_t ii=0;
+
+ tids->tids_port = port;
+ n_fd=tids_listen(tids, 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 n_fd;
+}
+
+/* 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. */
+#define MAX_SOCKETS 10
int tids_start (TIDS_INSTANCE *tids,
- TIDS_REQ_FUNC *req_handler,
- tids_auth_func *auth_handler,
- const char *hostname,
- unsigned int port,
- void *cookie)
+ 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[MAX_SOCKETS]={0};
+ size_t n_fd=0;
+ struct pollfd poll_fd[MAX_SOCKETS]={{0}};
+ int ii=0;
- if (0 > (listen = tids_listen(tids, port)))
+ n_fd=tids_get_listener(tids, req_handler, auth_handler, hostname, port, cookie, fd, MAX_SOCKETS);
+ if (n_fd <= 0) {
perror ("Error from tids_listen()");
+ return 1;
+ }
- /* 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);
+
+ /* 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 (pid == 0) {
- close(listen);
- tids_handle_connection(tids, conn);
- close(conn);
- return 0;
- } else {
- close(conn);
+ if ((poll_fd[ii].revents & POLLERR) || (poll_fd[ii].revents & POLLNVAL)) {
+ perror("Error polling fd");
+ continue;
+ }
+
+ 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" */
}
+#undef MAX_SOCKETS
void tids_destroy (TIDS_INSTANCE *tids)
{
+ /* clean up logfiles */
+ tr_log_close();
+
if (tids)
free(tids);
}
-
-
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