1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2013 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
27 #include "bus-internal.h"
28 #include "bus-socket.h"
29 #include "bus-container.h"
31 int bus_container_connect_socket(sd_bus *b) {
32 _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, rootfd = -1;
38 assert(b->input_fd < 0);
39 assert(b->output_fd < 0);
40 assert(b->nspid > 0 || b->machine);
43 r = container_get_leader(b->machine, &b->nspid);
48 r = namespace_open(b->nspid, &pidnsfd, &mntnsfd, NULL, &rootfd);
52 b->input_fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
56 b->output_fd = b->input_fd;
67 r = namespace_enter(pidnsfd, mntnsfd, -1, rootfd);
71 /* We just changed PID namespace, however it will only
72 * take effect on the children we now fork. Hence,
73 * let's fork another time, and connect from this
74 * grandchild, so that SO_PEERCRED of our connection
75 * comes from a process from within the container, and
76 * not outside of it */
82 if (grandchild == 0) {
84 r = connect(b->input_fd, &b->sockaddr.sa, b->sockaddr_size);
86 if (errno == EINPROGRESS)
95 r = wait_for_terminate(grandchild, &si);
99 if (si.si_code != CLD_EXITED)
105 r = wait_for_terminate(child, &si);
109 if (si.si_code != CLD_EXITED)
112 if (si.si_status == 1)
115 if (si.si_status != EXIT_SUCCESS)
118 return bus_socket_start_auth(b);
121 int bus_container_connect_kernel(sd_bus *b) {
122 _cleanup_close_pair_ int pair[2] = { -1, -1 };
123 _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, rootfd = -1;
125 struct cmsghdr cmsghdr;
126 uint8_t buf[CMSG_SPACE(sizeof(int))];
129 .msg_control = &control,
130 .msg_controllen = sizeof(control),
132 struct cmsghdr *cmsg;
136 _cleanup_close_ int fd = -1;
139 assert(b->input_fd < 0);
140 assert(b->output_fd < 0);
141 assert(b->nspid > 0 || b->machine);
144 r = container_get_leader(b->machine, &b->nspid);
149 r = namespace_open(b->nspid, &pidnsfd, &mntnsfd, NULL, &rootfd);
153 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0)
163 pair[0] = safe_close(pair[0]);
165 r = namespace_enter(pidnsfd, mntnsfd, -1, rootfd);
169 /* We just changed PID namespace, however it will only
170 * take effect on the children we now fork. Hence,
171 * let's fork another time, and connect from this
172 * grandchild, so that kdbus only sees the credentials
173 * of this process which comes from within the
174 * container, and not outside of it */
180 if (grandchild == 0) {
182 fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC);
186 cmsg = CMSG_FIRSTHDR(&mh);
187 cmsg->cmsg_level = SOL_SOCKET;
188 cmsg->cmsg_type = SCM_RIGHTS;
189 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
190 memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
192 mh.msg_controllen = cmsg->cmsg_len;
194 if (sendmsg(pair[1], &mh, MSG_NOSIGNAL) < 0)
200 r = wait_for_terminate(grandchild, &si);
204 if (si.si_code != CLD_EXITED)
210 pair[1] = safe_close(pair[1]);
212 r = wait_for_terminate(child, &si);
216 if (si.si_code != CLD_EXITED)
219 if (si.si_status != EXIT_SUCCESS)
222 if (recvmsg(pair[0], &mh, MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) < 0)
225 for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg))
226 if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
230 fds = (int*) CMSG_DATA(cmsg);
231 n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
234 close_many(fds, n_fds);
241 b->input_fd = b->output_fd = fd;
244 return bus_kernel_take_fd(b);