+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2013 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <unistd.h>
-#include <fcntl.h>
-
-#include "util.h"
-#include "process-util.h"
-#include "bus-internal.h"
-#include "bus-socket.h"
-#include "bus-container.h"
-
-int bus_container_connect_socket(sd_bus *b) {
- _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, rootfd = -1;
- pid_t child;
- siginfo_t si;
- int r;
-
- assert(b);
- assert(b->input_fd < 0);
- assert(b->output_fd < 0);
- assert(b->nspid > 0 || b->machine);
-
- if (b->nspid <= 0) {
- r = container_get_leader(b->machine, &b->nspid);
- if (r < 0)
- return r;
- }
-
- r = namespace_open(b->nspid, &pidnsfd, &mntnsfd, NULL, &rootfd);
- if (r < 0)
- return r;
-
- b->input_fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
- if (b->input_fd < 0)
- return -errno;
-
- b->output_fd = b->input_fd;
-
- bus_socket_setup(b);
-
- child = fork();
- if (child < 0)
- return -errno;
-
- if (child == 0) {
- pid_t grandchild;
-
- r = namespace_enter(pidnsfd, mntnsfd, -1, rootfd);
- if (r < 0)
- _exit(255);
-
- /* We just changed PID namespace, however it will only
- * take effect on the children we now fork. Hence,
- * let's fork another time, and connect from this
- * grandchild, so that SO_PEERCRED of our connection
- * comes from a process from within the container, and
- * not outside of it */
-
- grandchild = fork();
- if (grandchild < 0)
- _exit(255);
-
- if (grandchild == 0) {
-
- r = connect(b->input_fd, &b->sockaddr.sa, b->sockaddr_size);
- if (r < 0) {
- if (errno == EINPROGRESS)
- _exit(1);
-
- _exit(255);
- }
-
- _exit(EXIT_SUCCESS);
- }
-
- r = wait_for_terminate(grandchild, &si);
- if (r < 0)
- _exit(255);
-
- if (si.si_code != CLD_EXITED)
- _exit(255);
-
- _exit(si.si_status);
- }
-
- r = wait_for_terminate(child, &si);
- if (r < 0)
- return r;
-
- if (si.si_code != CLD_EXITED)
- return -EIO;
-
- if (si.si_status == 1)
- return 1;
-
- if (si.si_status != EXIT_SUCCESS)
- return -EIO;
-
- return bus_socket_start_auth(b);
-}
-
-int bus_container_connect_kernel(sd_bus *b) {
- _cleanup_close_pair_ int pair[2] = { -1, -1 };
- _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, rootfd = -1;
- union {
- struct cmsghdr cmsghdr;
- uint8_t buf[CMSG_SPACE(sizeof(int))];
- } control = {};
- struct msghdr mh = {
- .msg_control = &control,
- .msg_controllen = sizeof(control),
- };
- struct cmsghdr *cmsg;
- pid_t child;
- siginfo_t si;
- int r;
- _cleanup_close_ int fd = -1;
-
- assert(b);
- assert(b->input_fd < 0);
- assert(b->output_fd < 0);
- assert(b->nspid > 0 || b->machine);
-
- if (b->nspid <= 0) {
- r = container_get_leader(b->machine, &b->nspid);
- if (r < 0)
- return r;
- }
-
- r = namespace_open(b->nspid, &pidnsfd, &mntnsfd, NULL, &rootfd);
- if (r < 0)
- return r;
-
- if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0)
- return -errno;
-
- child = fork();
- if (child < 0)
- return -errno;
-
- if (child == 0) {
- pid_t grandchild;
-
- pair[0] = safe_close(pair[0]);
-
- r = namespace_enter(pidnsfd, mntnsfd, -1, rootfd);
- if (r < 0)
- _exit(EXIT_FAILURE);
-
- /* We just changed PID namespace, however it will only
- * take effect on the children we now fork. Hence,
- * let's fork another time, and connect from this
- * grandchild, so that kdbus only sees the credentials
- * of this process which comes from within the
- * container, and not outside of it */
-
- grandchild = fork();
- if (grandchild < 0)
- _exit(EXIT_FAILURE);
-
- if (grandchild == 0) {
-
- fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC);
- if (fd < 0)
- _exit(EXIT_FAILURE);
-
- cmsg = CMSG_FIRSTHDR(&mh);
- cmsg->cmsg_level = SOL_SOCKET;
- cmsg->cmsg_type = SCM_RIGHTS;
- cmsg->cmsg_len = CMSG_LEN(sizeof(int));
- memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
-
- mh.msg_controllen = cmsg->cmsg_len;
-
- if (sendmsg(pair[1], &mh, MSG_NOSIGNAL) < 0)
- _exit(EXIT_FAILURE);
-
- _exit(EXIT_SUCCESS);
- }
-
- r = wait_for_terminate(grandchild, &si);
- if (r < 0)
- _exit(EXIT_FAILURE);
-
- if (si.si_code != CLD_EXITED)
- _exit(EXIT_FAILURE);
-
- _exit(si.si_status);
- }
-
- pair[1] = safe_close(pair[1]);
-
- r = wait_for_terminate(child, &si);
- if (r < 0)
- return r;
-
- if (si.si_code != CLD_EXITED)
- return -EIO;
-
- if (si.si_status != EXIT_SUCCESS)
- return -EIO;
-
- if (recvmsg(pair[0], &mh, MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) < 0)
- return -errno;
-
- CMSG_FOREACH(cmsg, &mh)
- if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
- int *fds;
- unsigned n_fds;
-
- fds = (int*) CMSG_DATA(cmsg);
- n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
-
- if (n_fds != 1) {
- close_many(fds, n_fds);
- return -EIO;
- }
-
- fd = fds[0];
- }
-
- b->input_fd = b->output_fd = fd;
- fd = -1;
-
- return bus_kernel_take_fd(b);
-}
~ianmdlvl / elogind.git / blobdiff