Initial version of KCM daemon
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@14544 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Luke Howard
460
kcm/connect.c
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460
kcm/connect.c
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@@ -0,0 +1,460 @@
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/*
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* Copyright (c) 1997-2004 Kungliga Tekniska H<>gskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "kcm_locl.h"
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RCSID("$Id$");
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struct descr {
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int s;
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int type;
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char *path;
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unsigned char *buf;
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size_t size;
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size_t len;
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time_t timeout;
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struct sockaddr_storage __ss;
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struct sockaddr *sa;
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socklen_t sock_len;
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struct ucred peercred;
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};
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static void
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init_descr(struct descr *d)
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{
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memset(d, 0, sizeof(*d));
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d->sa = (struct sockaddr *)&d->__ss;
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d->s = -1;
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}
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/*
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* re-initialize all `n' ->sa in `d'.
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*/
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static void
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reinit_descrs (struct descr *d, int n)
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{
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int i;
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for (i = 0; i < n; ++i)
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d[i].sa = (struct sockaddr *)&d[i].__ss;
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}
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/*
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* Create the socket (family, type, port) in `d'
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*/
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static void
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init_socket(struct descr *d)
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{
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struct sockaddr_un sun;
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struct sockaddr *sa = (struct sockaddr *)&sun;
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krb5_socklen_t sa_size = sizeof(sun);
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init_descr (d);
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sun.sun_family = AF_UNIX;
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if (socket_path != NULL)
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d->path = socket_path;
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else
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d->path = _PATH_KCM_SOCKET;
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strlcpy(sun.sun_path, d->path, sizeof(sun.sun_path));
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d->s = socket(AF_UNIX, SOCK_STREAM, 0);
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if (d->s < 0){
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krb5_warn(kcm_context, errno, "socket(%d, %d, 0)", AF_UNIX, SOCK_STREAM);
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d->s = -1;
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return;
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}
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#if defined(HAVE_SETSOCKOPT) && defined(SOL_SOCKET) && defined(SO_REUSEADDR)
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{
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int one = 1;
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setsockopt(d->s, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one));
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}
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#endif
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d->type = SOCK_STREAM;
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unlink(d->path);
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if (bind(d->s, sa, sa_size) < 0) {
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krb5_warn(kcm_context, errno, "bind %s", sun.sun_path);
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close(d->s);
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d->s = -1;
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return;
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}
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if (listen(d->s, SOMAXCONN) < 0) {
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krb5_warn(kcm_context, errno, "listen %s", sun.sun_path);
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close(d->s);
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d->s = -1;
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return;
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}
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chmod(d->path, 0777);
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return;
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}
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/*
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* Allocate descriptors for all the sockets that we should listen on
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* and return the number of them.
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*/
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static int
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init_sockets(struct descr **desc)
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{
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struct descr *d;
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size_t num = 0;
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d = (struct descr *)malloc(sizeof(*d));
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if (d == NULL) {
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krb5_errx(kcm_context, 1, "malloc failed");
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}
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init_socket(d);
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if (d->s != -1) {
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kcm_log(5, "listening on domain socket %s", d->path);
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num++;
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}
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reinit_descrs (d, num);
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*desc = d;
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return num;
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}
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/*
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* handle the request in `buf, len', from `addr' (or `from' as a string),
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* sending a reply in `reply'.
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*/
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static int
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process_request(unsigned char *buf,
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size_t len,
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krb5_data *reply,
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kcm_client *client)
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{
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krb5_data request;
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if (len < 4) {
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kcm_log(1, "malformed request from process %d (too short)", client->pid);
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return -1;
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}
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if (buf[0] != KCM_PROTOCOL_VERSION_MAJOR ||
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buf[1] != KCM_PROTOCOL_VERSION_MINOR) {
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kcm_log(1, "incorrect protocol version %d.%d from process %d",
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buf[0], buf[1], client->pid);
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return -1;
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}
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buf += 2;
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len -= 2;
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/* buf is now pointing at opcode */
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request.data = buf;
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request.length = len;
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return kcm_dispatch(kcm_context, client, &request, reply);
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}
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/*
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* Handle the request in `buf, len' to socket `d'
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*/
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static void
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do_request(void *buf, size_t len, struct descr *d)
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{
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krb5_error_code ret;
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krb5_data reply;
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kcm_client client;
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client.pid = d->peercred.pid;
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client.uid = d->peercred.uid;
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client.gid = d->peercred.gid;
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reply.length = 0;
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ret = process_request(buf, len, &reply, &client);
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if (reply.length != 0) {
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unsigned char len[4];
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kcm_log(5, "sending %lu bytes to process %d", (unsigned long)reply.length,
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client.pid);
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len[0] = (reply.length >> 24) & 0xff;
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len[1] = (reply.length >> 16) & 0xff;
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len[2] = (reply.length >> 8) & 0xff;
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len[3] = reply.length & 0xff;
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if (sendto(d->s, len, sizeof(len), 0, NULL, 0) < 0) {
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kcm_log (0, "sendto(%d): %d %s", d->peercred.pid, strerror(errno));
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krb5_data_free(&reply);
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return;
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}
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if (sendto(d->s, reply.data, reply.length, 0, NULL, 0) < 0) {
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kcm_log (0, "sendto(%d): %s", d->peercred.pid, strerror(errno));
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krb5_data_free(&reply);
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return;
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}
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krb5_data_free(&reply);
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}
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if (ret) {
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kcm_log(0, "Failed processing %lu byte request from process %d",
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(unsigned long)len, d->peercred.pid);
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}
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}
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static void
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clear_descr(struct descr *d)
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{
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if(d->buf)
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memset(d->buf, 0, d->size);
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d->len = 0;
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if(d->s != -1)
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close(d->s);
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d->s = -1;
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}
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#define STREAM_TIMEOUT 4
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/*
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* accept a new stream connection on `d[parent]' and store it in `d[child]'
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*/
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static void
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add_new_stream (struct descr *d, int parent, int child)
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{
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int s;
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if (child == -1)
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return;
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d[child].sock_len = sizeof(d[child].__ss);
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s = accept(d[parent].s, d[child].sa, &d[child].sock_len);
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if(s < 0) {
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krb5_warn(kcm_context, errno, "accept");
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return;
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}
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if (s >= FD_SETSIZE) {
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krb5_warnx(kcm_context, "socket FD too large");
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close (s);
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return;
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}
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d[child].s = s;
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d[child].timeout = time(NULL) + STREAM_TIMEOUT;
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d[child].type = SOCK_STREAM;
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}
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/*
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* Grow `d' to handle at least `n'.
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* Return != 0 if fails
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*/
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static int
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grow_descr (struct descr *d, size_t n)
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{
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if (d->size - d->len < n) {
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unsigned char *tmp;
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size_t grow;
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grow = max(1024, d->len + n);
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if (d->size + grow > max_request) {
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kcm_log(0, "Request exceeds max request size (%lu bytes).",
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(unsigned long)d->size + grow);
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clear_descr(d);
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return -1;
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}
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tmp = realloc (d->buf, d->size + grow);
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if (tmp == NULL) {
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kcm_log(0, "Failed to re-allocate %lu bytes.",
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(unsigned long)d->size + grow);
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clear_descr(d);
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return -1;
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}
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d->size += grow;
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d->buf = tmp;
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}
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return 0;
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}
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/*
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* Handle incoming data to the stream socket in `d[index]'
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*/
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static void
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handle_stream(struct descr *d, int index, int min_free)
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{
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unsigned char buf[1024];
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int n;
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int ret = 0;
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socklen_t peercredlen;
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if (d[index].timeout == 0) {
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add_new_stream (d, index, min_free);
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return;
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}
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d[index].peercred.pid = 0;
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d[index].peercred.uid = -1;
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d[index].peercred.gid = -1;
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if (getsockopt(d[index].s, SOL_SOCKET, SO_PEERCRED, (void *)&d[index].peercred,
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&peercredlen) != 0) {
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krb5_warn(kcm_context, errno, "failed to determine peer identity");
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return;
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}
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n = recvfrom(d[index].s, buf, sizeof(buf), 0, NULL, NULL);
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if (n < 0) {
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krb5_warn(kcm_context, errno, "recvfrom");
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return;
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} else if (n == 0) {
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krb5_warnx(kcm_context, "connection closed before end of data after %lu "
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"bytes from process %d",
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(unsigned long)d[index].len, d[index].peercred.pid);
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clear_descr (d + index);
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return;
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}
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if (grow_descr (&d[index], n))
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return;
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memcpy(d[index].buf + d[index].len, buf, n);
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d[index].len += n;
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if (d[index].len > 4) {
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krb5_storage *sp;
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int32_t len;
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sp = krb5_storage_from_mem(d[index].buf, d[index].len);
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if (sp == NULL) {
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kcm_log (0, "krb5_storage_from_mem failed");
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ret = -1;
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} else {
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krb5_ret_int32(sp, &len);
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krb5_storage_free(sp);
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if (d[index].len - 4 >= len) {
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memmove(d[index].buf, d[index].buf + 4, d[index].len - 4);
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ret = 1;
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} else
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ret = 0;
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}
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}
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if (ret < 0)
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return;
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else if (ret == 1) {
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do_request(d[index].buf, d[index].len, &d[index]);
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clear_descr(d + index);
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}
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}
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void
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kcm_loop(void)
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{
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struct descr *d;
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int ndescr;
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ndescr = init_sockets(&d);
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if (ndescr <= 0)
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krb5_errx(kcm_context, 1, "No sockets!");
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while (exit_flag == 0){
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struct timeval tmout;
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fd_set fds;
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int min_free = -1;
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int max_fd = 0;
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int i;
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FD_ZERO(&fds);
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for(i = 0; i < ndescr; i++) {
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if (d[i].s >= 0){
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if(d[i].type == SOCK_STREAM &&
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d[i].timeout && d[i].timeout < time(NULL)) {
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kcm_log(1, "Stream connection from %d expired after %lu bytes",
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d[i].peercred.pid, (unsigned long)d[i].len);
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clear_descr(&d[i]);
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continue;
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}
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if (max_fd < d[i].s)
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max_fd = d[i].s;
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if (max_fd >= FD_SETSIZE)
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krb5_errx(kcm_context, 1, "fd too large");
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FD_SET(d[i].s, &fds);
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} else if (min_free < 0 || i < min_free)
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min_free = i;
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}
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if (min_free == -1) {
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struct descr *tmp;
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tmp = realloc(d, (ndescr + 4) * sizeof(*d));
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if(tmp == NULL)
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krb5_warnx(kcm_context, "No memory");
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else {
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d = tmp;
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reinit_descrs (d, ndescr);
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memset(d + ndescr, 0, 4 * sizeof(*d));
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for(i = ndescr; i < ndescr + 4; i++)
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init_descr (&d[i]);
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min_free = ndescr;
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ndescr += 4;
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}
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}
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tmout.tv_sec = STREAM_TIMEOUT;
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tmout.tv_usec = 0;
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switch (select(max_fd + 1, &fds, 0, 0, &tmout)){
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case 0:
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kcm_run_events(kcm_context, time(NULL));
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break;
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case -1:
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if (errno != EINTR)
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krb5_warn(kcm_context, errno, "select");
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break;
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default:
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for(i = 0; i < ndescr; i++) {
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if(d[i].s >= 0 && FD_ISSET(d[i].s, &fds)) {
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if (d[i].type == SOCK_STREAM)
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handle_stream(d, i, min_free);
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}
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}
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kcm_run_events(kcm_context, time(NULL));
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}
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}
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if (d->path != NULL)
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unlink(d->path);
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free(d);
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}
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