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-rw-r--r--crypto/heimdal/kcm/connect.c688
1 files changed, 688 insertions, 0 deletions
diff --git a/crypto/heimdal/kcm/connect.c b/crypto/heimdal/kcm/connect.c
new file mode 100644
index 0000000..b3a21aa
--- /dev/null
+++ b/crypto/heimdal/kcm/connect.c
@@ -0,0 +1,688 @@
+/*
+ * Copyright (c) 1997-2005 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "kcm_locl.h"
+
+RCSID("$Id: connect.c 16314 2005-11-29 19:03:50Z lha $");
+
+struct descr {
+ int s;
+ int type;
+ char *path;
+ unsigned char *buf;
+ size_t size;
+ size_t len;
+ time_t timeout;
+ struct sockaddr_storage __ss;
+ struct sockaddr *sa;
+ socklen_t sock_len;
+ kcm_client peercred;
+};
+
+static void
+init_descr(struct descr *d)
+{
+ memset(d, 0, sizeof(*d));
+ d->sa = (struct sockaddr *)&d->__ss;
+ d->s = -1;
+}
+
+/*
+ * re-initialize all `n' ->sa in `d'.
+ */
+
+static void
+reinit_descrs (struct descr *d, int n)
+{
+ int i;
+
+ for (i = 0; i < n; ++i)
+ d[i].sa = (struct sockaddr *)&d[i].__ss;
+}
+
+/*
+ * Update peer credentials from socket.
+ *
+ * SCM_CREDS can only be updated the first time there is read data to
+ * read from the filedescriptor, so if we read do it before this
+ * point, the cred data might not be is not there yet.
+ */
+
+static int
+update_client_creds(int s, kcm_client *peer)
+{
+#ifdef GETPEERUCRED
+ /* Solaris 10 */
+ {
+ ucred_t *peercred;
+
+ if (getpeerucred(s, &peercred) != 0) {
+ peer->uid = ucred_geteuid(peercred);
+ peer->gid = ucred_getegid(peercred);
+ peer->pid = 0;
+ ucred_free(peercred);
+ return 0;
+ }
+ }
+#endif
+#ifdef GETPEEREID
+ /* FreeBSD, OpenBSD */
+ {
+ uid_t uid;
+ gid_t gid;
+
+ if (getpeereid(s, &uid, &gid) == 0) {
+ peer->uid = uid;
+ peer->gid = gid;
+ peer->pid = 0;
+ return 0;
+ }
+ }
+#endif
+#ifdef SO_PEERCRED
+ /* Linux */
+ {
+ struct ucred pc;
+ socklen_t pclen = sizeof(pc);
+
+ if (getsockopt(s, SOL_SOCKET, SO_PEERCRED, (void *)&pc, &pclen) == 0) {
+ peer->uid = pc.uid;
+ peer->gid = pc.gid;
+ peer->pid = pc.pid;
+ return 0;
+ }
+ }
+#endif
+#if defined(LOCAL_PEERCRED) && defined(XUCRED_VERSION)
+ {
+ struct xucred peercred;
+ socklen_t peercredlen = sizeof(peercred);
+
+ if (getsockopt(s, LOCAL_PEERCRED, 1,
+ (void *)&peercred, &peercredlen) == 0
+ && peercred.cr_version == XUCRED_VERSION)
+ {
+ peer->uid = peercred.cr_uid;
+ peer->gid = peercred.cr_gid;
+ peer->pid = 0;
+ return 0;
+ }
+ }
+#endif
+#if defined(SOCKCREDSIZE) && defined(SCM_CREDS)
+ /* NetBSD */
+ if (peer->uid == -1) {
+ struct msghdr msg;
+ socklen_t crmsgsize;
+ void *crmsg;
+ struct cmsghdr *cmp;
+ struct sockcred *sc;
+
+ memset(&msg, 0, sizeof(msg));
+ crmsgsize = CMSG_SPACE(SOCKCREDSIZE(NGROUPS));
+ if (crmsgsize == 0)
+ return 1 ;
+
+ crmsg = malloc(crmsgsize);
+ if (crmsg == NULL)
+ goto failed_scm_creds;
+
+ memset(crmsg, 0, crmsgsize);
+
+ msg.msg_control = crmsg;
+ msg.msg_controllen = crmsgsize;
+
+ if (recvmsg(s, &msg, 0) < 0) {
+ free(crmsg);
+ goto failed_scm_creds;
+ }
+
+ if (msg.msg_controllen == 0 || (msg.msg_flags & MSG_CTRUNC) != 0) {
+ free(crmsg);
+ goto failed_scm_creds;
+ }
+
+ cmp = CMSG_FIRSTHDR(&msg);
+ if (cmp->cmsg_level != SOL_SOCKET || cmp->cmsg_type != SCM_CREDS) {
+ free(crmsg);
+ goto failed_scm_creds;
+ }
+
+ sc = (struct sockcred *)(void *)CMSG_DATA(cmp);
+
+ peer->uid = sc->sc_euid;
+ peer->gid = sc->sc_egid;
+ peer->pid = 0;
+
+ free(crmsg);
+ return 0;
+ } else {
+ /* we already got the cred, just return it */
+ return 0;
+ }
+ failed_scm_creds:
+#endif
+ krb5_warn(kcm_context, errno, "failed to determine peer identity");
+ return 1;
+}
+
+
+/*
+ * Create the socket (family, type, port) in `d'
+ */
+
+static void
+init_socket(struct descr *d)
+{
+ struct sockaddr_un un;
+ struct sockaddr *sa = (struct sockaddr *)&un;
+ krb5_socklen_t sa_size = sizeof(un);
+
+ init_descr (d);
+
+ un.sun_family = AF_UNIX;
+
+ if (socket_path != NULL)
+ d->path = socket_path;
+ else
+ d->path = _PATH_KCM_SOCKET;
+
+ strlcpy(un.sun_path, d->path, sizeof(un.sun_path));
+
+ d->s = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (d->s < 0){
+ krb5_warn(kcm_context, errno, "socket(%d, %d, 0)", AF_UNIX, SOCK_STREAM);
+ d->s = -1;
+ return;
+ }
+#if defined(HAVE_SETSOCKOPT) && defined(SOL_SOCKET) && defined(SO_REUSEADDR)
+ {
+ int one = 1;
+ setsockopt(d->s, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one));
+ }
+#endif
+#ifdef LOCAL_CREDS
+ {
+ int one = 1;
+ setsockopt(d->s, 0, LOCAL_CREDS, (void *)&one, sizeof(one));
+ }
+#endif
+
+ d->type = SOCK_STREAM;
+
+ unlink(d->path);
+
+ if (bind(d->s, sa, sa_size) < 0) {
+ krb5_warn(kcm_context, errno, "bind %s", un.sun_path);
+ close(d->s);
+ d->s = -1;
+ return;
+ }
+
+ if (listen(d->s, SOMAXCONN) < 0) {
+ krb5_warn(kcm_context, errno, "listen %s", un.sun_path);
+ close(d->s);
+ d->s = -1;
+ return;
+ }
+
+ chmod(d->path, 0777);
+
+ return;
+}
+
+/*
+ * Allocate descriptors for all the sockets that we should listen on
+ * and return the number of them.
+ */
+
+static int
+init_sockets(struct descr **desc)
+{
+ struct descr *d;
+ size_t num = 0;
+
+ d = (struct descr *)malloc(sizeof(*d));
+ if (d == NULL) {
+ krb5_errx(kcm_context, 1, "malloc failed");
+ }
+
+ init_socket(d);
+ if (d->s != -1) {
+ kcm_log(5, "listening on domain socket %s", d->path);
+ num++;
+ }
+
+ reinit_descrs (d, num);
+ *desc = d;
+
+ return num;
+}
+
+/*
+ * handle the request in `buf, len', from `addr' (or `from' as a string),
+ * sending a reply in `reply'.
+ */
+
+static int
+process_request(unsigned char *buf,
+ size_t len,
+ krb5_data *reply,
+ kcm_client *client)
+{
+ krb5_data request;
+
+ if (len < 4) {
+ kcm_log(1, "malformed request from process %d (too short)",
+ client->pid);
+ return -1;
+ }
+
+ if (buf[0] != KCM_PROTOCOL_VERSION_MAJOR ||
+ buf[1] != KCM_PROTOCOL_VERSION_MINOR) {
+ kcm_log(1, "incorrect protocol version %d.%d from process %d",
+ buf[0], buf[1], client->pid);
+ return -1;
+ }
+
+ buf += 2;
+ len -= 2;
+
+ /* buf is now pointing at opcode */
+
+ request.data = buf;
+ request.length = len;
+
+ return kcm_dispatch(kcm_context, client, &request, reply);
+}
+
+/*
+ * Handle the request in `buf, len' to socket `d'
+ */
+
+static void
+do_request(void *buf, size_t len, struct descr *d)
+{
+ krb5_error_code ret;
+ krb5_data reply;
+
+ reply.length = 0;
+
+ ret = process_request(buf, len, &reply, &d->peercred);
+ if (reply.length != 0) {
+ unsigned char len[4];
+ struct msghdr msghdr;
+ struct iovec iov[2];
+
+ kcm_log(5, "sending %lu bytes to process %d",
+ (unsigned long)reply.length,
+ (int)d->peercred.pid);
+
+ memset (&msghdr, 0, sizeof(msghdr));
+ msghdr.msg_name = NULL;
+ msghdr.msg_namelen = 0;
+ msghdr.msg_iov = iov;
+ msghdr.msg_iovlen = sizeof(iov)/sizeof(*iov);
+#if 0
+ msghdr.msg_control = NULL;
+ msghdr.msg_controllen = 0;
+#endif
+
+ len[0] = (reply.length >> 24) & 0xff;
+ len[1] = (reply.length >> 16) & 0xff;
+ len[2] = (reply.length >> 8) & 0xff;
+ len[3] = reply.length & 0xff;
+
+ iov[0].iov_base = (void*)len;
+ iov[0].iov_len = 4;
+ iov[1].iov_base = reply.data;
+ iov[1].iov_len = reply.length;
+
+ if (sendmsg (d->s, &msghdr, 0) < 0) {
+ kcm_log (0, "sendmsg(%d): %d %s", (int)d->peercred.pid,
+ errno, strerror(errno));
+ krb5_data_free(&reply);
+ return;
+ }
+
+ krb5_data_free(&reply);
+ }
+
+ if (ret) {
+ kcm_log(0, "Failed processing %lu byte request from process %d",
+ (unsigned long)len, d->peercred.pid);
+ }
+}
+
+static void
+clear_descr(struct descr *d)
+{
+ if(d->buf)
+ memset(d->buf, 0, d->size);
+ d->len = 0;
+ if(d->s != -1)
+ close(d->s);
+ d->s = -1;
+}
+
+#define STREAM_TIMEOUT 4
+
+/*
+ * accept a new stream connection on `d[parent]' and store it in `d[child]'
+ */
+
+static void
+add_new_stream (struct descr *d, int parent, int child)
+{
+ int s;
+
+ if (child == -1)
+ return;
+
+ d[child].peercred.pid = -1;
+ d[child].peercred.uid = -1;
+ d[child].peercred.gid = -1;
+
+ d[child].sock_len = sizeof(d[child].__ss);
+ s = accept(d[parent].s, d[child].sa, &d[child].sock_len);
+ if(s < 0) {
+ krb5_warn(kcm_context, errno, "accept");
+ return;
+ }
+
+ if (s >= FD_SETSIZE) {
+ krb5_warnx(kcm_context, "socket FD too large");
+ close (s);
+ return;
+ }
+
+ d[child].s = s;
+ d[child].timeout = time(NULL) + STREAM_TIMEOUT;
+ d[child].type = SOCK_STREAM;
+}
+
+/*
+ * Grow `d' to handle at least `n'.
+ * Return != 0 if fails
+ */
+
+static int
+grow_descr (struct descr *d, size_t n)
+{
+ if (d->size - d->len < n) {
+ unsigned char *tmp;
+ size_t grow;
+
+ grow = max(1024, d->len + n);
+ if (d->size + grow > max_request) {
+ kcm_log(0, "Request exceeds max request size (%lu bytes).",
+ (unsigned long)d->size + grow);
+ clear_descr(d);
+ return -1;
+ }
+ tmp = realloc (d->buf, d->size + grow);
+ if (tmp == NULL) {
+ kcm_log(0, "Failed to re-allocate %lu bytes.",
+ (unsigned long)d->size + grow);
+ clear_descr(d);
+ return -1;
+ }
+ d->size += grow;
+ d->buf = tmp;
+ }
+ return 0;
+}
+
+/*
+ * Handle incoming data to the stream socket in `d[index]'
+ */
+
+static void
+handle_stream(struct descr *d, int index, int min_free)
+{
+ unsigned char buf[1024];
+ int n;
+ int ret = 0;
+
+ if (d[index].timeout == 0) {
+ add_new_stream (d, index, min_free);
+ return;
+ }
+
+ if (update_client_creds(d[index].s, &d[index].peercred)) {
+ krb5_warnx(kcm_context, "failed to update peer identity");
+ clear_descr(d + index);
+ return;
+ }
+
+ if (d[index].peercred.uid == -1) {
+ krb5_warnx(kcm_context, "failed to determine peer identity");
+ clear_descr (d + index);
+ return;
+ }
+
+ n = recvfrom(d[index].s, buf, sizeof(buf), 0, NULL, NULL);
+ if (n < 0) {
+ krb5_warn(kcm_context, errno, "recvfrom");
+ return;
+ } else if (n == 0) {
+ krb5_warnx(kcm_context, "connection closed before end of data "
+ "after %lu bytes from process %ld",
+ (unsigned long) d[index].len, (long) d[index].peercred.pid);
+ clear_descr (d + index);
+ return;
+ }
+ if (grow_descr (&d[index], n))
+ return;
+ memcpy(d[index].buf + d[index].len, buf, n);
+ d[index].len += n;
+ if (d[index].len > 4) {
+ krb5_storage *sp;
+ int32_t len;
+
+ sp = krb5_storage_from_mem(d[index].buf, d[index].len);
+ if (sp == NULL) {
+ kcm_log (0, "krb5_storage_from_mem failed");
+ ret = -1;
+ } else {
+ krb5_ret_int32(sp, &len);
+ krb5_storage_free(sp);
+ if (d[index].len - 4 >= len) {
+ memmove(d[index].buf, d[index].buf + 4, d[index].len - 4);
+ ret = 1;
+ } else
+ ret = 0;
+ }
+ }
+ if (ret < 0)
+ return;
+ else if (ret == 1) {
+ do_request(d[index].buf, d[index].len, &d[index]);
+ clear_descr(d + index);
+ }
+}
+
+#ifdef HAVE_DOOR_CREATE
+
+static void
+kcm_door_server(void *cookie, char *argp, size_t arg_size,
+ door_desc_t *dp, uint_t n_desc)
+{
+ kcm_client peercred;
+ door_cred_t cred;
+ krb5_error_code ret;
+ krb5_data reply;
+ size_t length;
+ char *p;
+
+ reply.length = 0;
+
+ p = NULL;
+ length = 0;
+
+ if (door_cred(&cred) != 0) {
+ kcm_log(0, "door_cred failed with %s", strerror(errno));
+ goto out;
+ }
+
+ peercred.uid = cred.dc_euid;
+ peercred.gid = cred.dc_egid;
+ peercred.pid = cred.dc_pid;
+
+ ret = process_request((unsigned char*)argp, arg_size, &reply, &peercred);
+ if (reply.length != 0) {
+ p = alloca(reply.length); /* XXX don't use alloca */
+ if (p) {
+ memcpy(p, reply.data, reply.length);
+ length = reply.length;
+ }
+ krb5_data_free(&reply);
+ }
+
+ out:
+ door_return(p, length, NULL, 0);
+}
+
+static void
+kcm_setup_door(void)
+{
+ int fd, ret;
+ char *path;
+
+ fd = door_create(kcm_door_server, NULL, 0);
+ if (fd < 0)
+ krb5_err(kcm_context, 1, errno, "Failed to create door");
+
+ if (door_path != NULL)
+ path = door_path;
+ else
+ path = _PATH_KCM_DOOR;
+
+ unlink(path);
+ ret = open(path, O_RDWR | O_CREAT, 0666);
+ if (ret < 0)
+ krb5_err(kcm_context, 1, errno, "Failed to create/open door");
+ close(ret);
+
+ ret = fattach(fd, path);
+ if (ret < 0)
+ krb5_err(kcm_context, 1, errno, "Failed to attach door");
+
+}
+#endif /* HAVE_DOOR_CREATE */
+
+
+void
+kcm_loop(void)
+{
+ struct descr *d;
+ int ndescr;
+
+#ifdef HAVE_DOOR_CREATE
+ kcm_setup_door();
+#endif
+
+ ndescr = init_sockets(&d);
+ if (ndescr <= 0) {
+ krb5_warnx(kcm_context, "No sockets!");
+#ifndef HAVE_DOOR_CREATE
+ exit(1);
+#endif
+ }
+ while (exit_flag == 0){
+ struct timeval tmout;
+ fd_set fds;
+ int min_free = -1;
+ int max_fd = 0;
+ int i;
+
+ FD_ZERO(&fds);
+ for(i = 0; i < ndescr; i++) {
+ if (d[i].s >= 0){
+ if(d[i].type == SOCK_STREAM &&
+ d[i].timeout && d[i].timeout < time(NULL)) {
+ kcm_log(1, "Stream connection from %d expired after %lu bytes",
+ d[i].peercred.pid, (unsigned long)d[i].len);
+ clear_descr(&d[i]);
+ continue;
+ }
+ if (max_fd < d[i].s)
+ max_fd = d[i].s;
+ if (max_fd >= FD_SETSIZE)
+ krb5_errx(kcm_context, 1, "fd too large");
+ FD_SET(d[i].s, &fds);
+ } else if (min_free < 0 || i < min_free)
+ min_free = i;
+ }
+ if (min_free == -1) {
+ struct descr *tmp;
+ tmp = realloc(d, (ndescr + 4) * sizeof(*d));
+ if(tmp == NULL)
+ krb5_warnx(kcm_context, "No memory");
+ else {
+ d = tmp;
+ reinit_descrs (d, ndescr);
+ memset(d + ndescr, 0, 4 * sizeof(*d));
+ for(i = ndescr; i < ndescr + 4; i++)
+ init_descr (&d[i]);
+ min_free = ndescr;
+ ndescr += 4;
+ }
+ }
+
+ tmout.tv_sec = STREAM_TIMEOUT;
+ tmout.tv_usec = 0;
+ switch (select(max_fd + 1, &fds, 0, 0, &tmout)){
+ case 0:
+ kcm_run_events(kcm_context, time(NULL));
+ break;
+ case -1:
+ if (errno != EINTR)
+ krb5_warn(kcm_context, errno, "select");
+ break;
+ default:
+ for(i = 0; i < ndescr; i++) {
+ if(d[i].s >= 0 && FD_ISSET(d[i].s, &fds)) {
+ if (d[i].type == SOCK_STREAM)
+ handle_stream(d, i, min_free);
+ }
+ }
+ kcm_run_events(kcm_context, time(NULL));
+ break;
+ }
+ }
+ if (d->path != NULL)
+ unlink(d->path);
+ free(d);
+}
+
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