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-rw-r--r--src/import/pull-common.c545
1 files changed, 545 insertions, 0 deletions
diff --git a/src/import/pull-common.c b/src/import/pull-common.c
new file mode 100644
index 0000000000..38380fc018
--- /dev/null
+++ b/src/import/pull-common.c
@@ -0,0 +1,545 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2015 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 <sys/prctl.h>
+
+#include "util.h"
+#include "strv.h"
+#include "copy.h"
+#include "btrfs-util.h"
+#include "capability.h"
+#include "pull-job.h"
+#include "pull-common.h"
+
+#define FILENAME_ESCAPE "/.#\"\'"
+
+int pull_find_old_etags(const char *url, const char *image_root, int dt, const char *prefix, const char *suffix, char ***etags) {
+ _cleanup_free_ char *escaped_url = NULL;
+ _cleanup_closedir_ DIR *d = NULL;
+ _cleanup_strv_free_ char **l = NULL;
+ struct dirent *de;
+ int r;
+
+ assert(url);
+ assert(etags);
+
+ if (!image_root)
+ image_root = "/var/lib/machines";
+
+ escaped_url = xescape(url, FILENAME_ESCAPE);
+ if (!escaped_url)
+ return -ENOMEM;
+
+ d = opendir(image_root);
+ if (!d) {
+ if (errno == ENOENT) {
+ *etags = NULL;
+ return 0;
+ }
+
+ return -errno;
+ }
+
+ FOREACH_DIRENT_ALL(de, d, return -errno) {
+ const char *a, *b;
+ char *u;
+
+ if (de->d_type != DT_UNKNOWN &&
+ de->d_type != dt)
+ continue;
+
+ if (prefix) {
+ a = startswith(de->d_name, prefix);
+ if (!a)
+ continue;
+ } else
+ a = de->d_name;
+
+ a = startswith(a, escaped_url);
+ if (!a)
+ continue;
+
+ a = startswith(a, ".");
+ if (!a)
+ continue;
+
+ if (suffix) {
+ b = endswith(de->d_name, suffix);
+ if (!b)
+ continue;
+ } else
+ b = strchr(de->d_name, 0);
+
+ if (a >= b)
+ continue;
+
+ u = cunescape_length(a, b - a);
+ if (!u)
+ return -ENOMEM;
+
+ if (!http_etag_is_valid(u)) {
+ free(u);
+ continue;
+ }
+
+ r = strv_consume(&l, u);
+ if (r < 0)
+ return r;
+ }
+
+ *etags = l;
+ l = NULL;
+
+ return 0;
+}
+
+int pull_make_local_copy(const char *final, const char *image_root, const char *local, bool force_local) {
+ const char *p;
+ int r;
+
+ assert(final);
+ assert(local);
+
+ if (!image_root)
+ image_root = "/var/lib/machines";
+
+ p = strjoina(image_root, "/", local);
+
+ if (force_local) {
+ (void) btrfs_subvol_remove(p);
+ (void) rm_rf_dangerous(p, false, true, false);
+ }
+
+ r = btrfs_subvol_snapshot(final, p, false, false);
+ if (r == -ENOTTY) {
+ r = copy_tree(final, p, false);
+ if (r < 0)
+ return log_error_errno(r, "Failed to copy image: %m");
+ } else if (r < 0)
+ return log_error_errno(r, "Failed to create local image: %m");
+
+ log_info("Created new local image '%s'.", local);
+
+ return 0;
+}
+
+int pull_make_read_only_fd(int fd) {
+ int r;
+
+ assert(fd >= 0);
+
+ /* First, let's make this a read-only subvolume if it refers
+ * to a subvolume */
+ r = btrfs_subvol_set_read_only_fd(fd, true);
+ if (r == -ENOTTY || r == -ENOTDIR || r == -EINVAL) {
+ struct stat st;
+
+ /* This doesn't refer to a subvolume, or the file
+ * system isn't even btrfs. In that, case fall back to
+ * chmod()ing */
+
+ r = fstat(fd, &st);
+ if (r < 0)
+ return log_error_errno(errno, "Failed to stat temporary image: %m");
+
+ /* Drop "w" flag */
+ if (fchmod(fd, st.st_mode & 07555) < 0)
+ return log_error_errno(errno, "Failed to chmod() final image: %m");
+
+ return 0;
+
+ } else if (r < 0)
+ return log_error_errno(r, "Failed to make subvolume read-only: %m");
+
+ return 0;
+}
+
+int pull_make_read_only(const char *path) {
+ _cleanup_close_ int fd = 1;
+
+ fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC);
+ if (fd < 0)
+ return log_error_errno(errno, "Failed to open %s: %m", path);
+
+ return pull_make_read_only_fd(fd);
+}
+
+int pull_make_path(const char *url, const char *etag, const char *image_root, const char *prefix, const char *suffix, char **ret) {
+ _cleanup_free_ char *escaped_url = NULL;
+ char *path;
+
+ assert(url);
+ assert(ret);
+
+ if (!image_root)
+ image_root = "/var/lib/machines";
+
+ escaped_url = xescape(url, FILENAME_ESCAPE);
+ if (!escaped_url)
+ return -ENOMEM;
+
+ if (etag) {
+ _cleanup_free_ char *escaped_etag = NULL;
+
+ escaped_etag = xescape(etag, FILENAME_ESCAPE);
+ if (!escaped_etag)
+ return -ENOMEM;
+
+ path = strjoin(image_root, "/", strempty(prefix), escaped_url, ".", escaped_etag, strempty(suffix), NULL);
+ } else
+ path = strjoin(image_root, "/", strempty(prefix), escaped_url, strempty(suffix), NULL);
+ if (!path)
+ return -ENOMEM;
+
+ *ret = path;
+ return 0;
+}
+
+int pull_make_verification_jobs(
+ PullJob **ret_checksum_job,
+ PullJob **ret_signature_job,
+ ImportVerify verify,
+ const char *url,
+ CurlGlue *glue,
+ PullJobFinished on_finished,
+ void *userdata) {
+
+ _cleanup_(pull_job_unrefp) PullJob *checksum_job = NULL, *signature_job = NULL;
+ int r;
+
+ assert(ret_checksum_job);
+ assert(ret_signature_job);
+ assert(verify >= 0);
+ assert(verify < _IMPORT_VERIFY_MAX);
+ assert(url);
+ assert(glue);
+
+ if (verify != IMPORT_VERIFY_NO) {
+ _cleanup_free_ char *checksum_url = NULL;
+
+ /* Queue job for the SHA256SUMS file for the image */
+ r = import_url_change_last_component(url, "SHA256SUMS", &checksum_url);
+ if (r < 0)
+ return r;
+
+ r = pull_job_new(&checksum_job, checksum_url, glue, userdata);
+ if (r < 0)
+ return r;
+
+ checksum_job->on_finished = on_finished;
+ checksum_job->uncompressed_max = checksum_job->compressed_max = 1ULL * 1024ULL * 1024ULL;
+ }
+
+ if (verify == IMPORT_VERIFY_SIGNATURE) {
+ _cleanup_free_ char *signature_url = NULL;
+
+ /* Queue job for the SHA256SUMS.gpg file for the image. */
+ r = import_url_change_last_component(url, "SHA256SUMS.gpg", &signature_url);
+ if (r < 0)
+ return r;
+
+ r = pull_job_new(&signature_job, signature_url, glue, userdata);
+ if (r < 0)
+ return r;
+
+ signature_job->on_finished = on_finished;
+ signature_job->uncompressed_max = signature_job->compressed_max = 1ULL * 1024ULL * 1024ULL;
+ }
+
+ *ret_checksum_job = checksum_job;
+ *ret_signature_job = signature_job;
+
+ checksum_job = signature_job = NULL;
+
+ return 0;
+}
+
+int pull_verify(
+ PullJob *main_job,
+ PullJob *checksum_job,
+ PullJob *signature_job) {
+
+ _cleanup_close_pair_ int gpg_pipe[2] = { -1, -1 };
+ _cleanup_free_ char *fn = NULL;
+ _cleanup_close_ int sig_file = -1;
+ const char *p, *line;
+ char sig_file_path[] = "/tmp/sigXXXXXX", gpg_home[] = "/tmp/gpghomeXXXXXX";
+ _cleanup_sigkill_wait_ pid_t pid = 0;
+ bool gpg_home_created = false;
+ int r;
+
+ assert(main_job);
+ assert(main_job->state == PULL_JOB_DONE);
+
+ if (!checksum_job)
+ return 0;
+
+ assert(main_job->calc_checksum);
+ assert(main_job->checksum);
+ assert(checksum_job->state == PULL_JOB_DONE);
+
+ if (!checksum_job->payload || checksum_job->payload_size <= 0) {
+ log_error("Checksum is empty, cannot verify.");
+ return -EBADMSG;
+ }
+
+ r = import_url_last_component(main_job->url, &fn);
+ if (r < 0)
+ return log_oom();
+
+ if (!filename_is_valid(fn)) {
+ log_error("Cannot verify checksum, could not determine valid server-side file name.");
+ return -EBADMSG;
+ }
+
+ line = strjoina(main_job->checksum, " *", fn, "\n");
+
+ p = memmem(checksum_job->payload,
+ checksum_job->payload_size,
+ line,
+ strlen(line));
+
+ if (!p || (p != (char*) checksum_job->payload && p[-1] != '\n')) {
+ log_error("Checksum did not check out, payload has been tempered with.");
+ return -EBADMSG;
+ }
+
+ log_info("SHA256 checksum of %s is valid.", main_job->url);
+
+ if (!signature_job)
+ return 0;
+
+ assert(signature_job->state == PULL_JOB_DONE);
+
+ if (!signature_job->payload || signature_job->payload_size <= 0) {
+ log_error("Signature is empty, cannot verify.");
+ return -EBADMSG;
+ }
+
+ r = pipe2(gpg_pipe, O_CLOEXEC);
+ if (r < 0)
+ return log_error_errno(errno, "Failed to create pipe for gpg: %m");
+
+ sig_file = mkostemp(sig_file_path, O_RDWR);
+ if (sig_file < 0)
+ return log_error_errno(errno, "Failed to create temporary file: %m");
+
+ r = loop_write(sig_file, signature_job->payload, signature_job->payload_size, false);
+ if (r < 0) {
+ log_error_errno(r, "Failed to write to temporary file: %m");
+ goto finish;
+ }
+
+ if (!mkdtemp(gpg_home)) {
+ r = log_error_errno(errno, "Failed to create tempory home for gpg: %m");
+ goto finish;
+ }
+
+ gpg_home_created = true;
+
+ pid = fork();
+ if (pid < 0)
+ return log_error_errno(errno, "Failed to fork off gpg: %m");
+ if (pid == 0) {
+ const char *cmd[] = {
+ "gpg",
+ "--no-options",
+ "--no-default-keyring",
+ "--no-auto-key-locate",
+ "--no-auto-check-trustdb",
+ "--batch",
+ "--trust-model=always",
+ NULL, /* --homedir= */
+ NULL, /* --keyring= */
+ NULL, /* --verify */
+ NULL, /* signature file */
+ NULL, /* dash */
+ NULL /* trailing NULL */
+ };
+ unsigned k = ELEMENTSOF(cmd) - 6;
+ int null_fd;
+
+ /* Child */
+
+ reset_all_signal_handlers();
+ reset_signal_mask();
+ assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
+
+ gpg_pipe[1] = safe_close(gpg_pipe[1]);
+
+ if (dup2(gpg_pipe[0], STDIN_FILENO) != STDIN_FILENO) {
+ log_error_errno(errno, "Failed to dup2() fd: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ if (gpg_pipe[0] != STDIN_FILENO)
+ gpg_pipe[0] = safe_close(gpg_pipe[0]);
+
+ null_fd = open("/dev/null", O_WRONLY|O_NOCTTY);
+ if (null_fd < 0) {
+ log_error_errno(errno, "Failed to open /dev/null: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ if (dup2(null_fd, STDOUT_FILENO) != STDOUT_FILENO) {
+ log_error_errno(errno, "Failed to dup2() fd: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ if (null_fd != STDOUT_FILENO)
+ null_fd = safe_close(null_fd);
+
+ cmd[k++] = strjoina("--homedir=", gpg_home);
+
+ /* We add the user keyring only to the command line
+ * arguments, if it's around since gpg fails
+ * otherwise. */
+ if (access(USER_KEYRING_PATH, F_OK) >= 0)
+ cmd[k++] = "--keyring=" USER_KEYRING_PATH;
+ else
+ cmd[k++] = "--keyring=" VENDOR_KEYRING_PATH;
+
+ cmd[k++] = "--verify";
+ cmd[k++] = sig_file_path;
+ cmd[k++] = "-";
+ cmd[k++] = NULL;
+
+ fd_cloexec(STDIN_FILENO, false);
+ fd_cloexec(STDOUT_FILENO, false);
+ fd_cloexec(STDERR_FILENO, false);
+
+ execvp("gpg2", (char * const *) cmd);
+ execvp("gpg", (char * const *) cmd);
+ log_error_errno(errno, "Failed to execute gpg: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ gpg_pipe[0] = safe_close(gpg_pipe[0]);
+
+ r = loop_write(gpg_pipe[1], checksum_job->payload, checksum_job->payload_size, false);
+ if (r < 0) {
+ log_error_errno(r, "Failed to write to pipe: %m");
+ goto finish;
+ }
+
+ gpg_pipe[1] = safe_close(gpg_pipe[1]);
+
+ r = wait_for_terminate_and_warn("gpg", pid, true);
+ pid = 0;
+ if (r < 0)
+ goto finish;
+ if (r > 0) {
+ log_error("Signature verification failed.");
+ r = -EBADMSG;
+ } else {
+ log_info("Signature verification succeeded.");
+ r = 0;
+ }
+
+finish:
+ if (sig_file >= 0)
+ unlink(sig_file_path);
+
+ if (gpg_home_created)
+ rm_rf_dangerous(gpg_home, false, true, false);
+
+ return r;
+}
+
+int pull_fork_tar(const char *path, pid_t *ret) {
+ _cleanup_close_pair_ int pipefd[2] = { -1, -1 };
+ pid_t pid;
+ int r;
+
+ assert(path);
+ assert(ret);
+
+ if (pipe2(pipefd, O_CLOEXEC) < 0)
+ return log_error_errno(errno, "Failed to create pipe for tar: %m");
+
+ pid = fork();
+ if (pid < 0)
+ return log_error_errno(errno, "Failed to fork off tar: %m");
+
+ if (pid == 0) {
+ int null_fd;
+ uint64_t retain =
+ (1ULL << CAP_CHOWN) |
+ (1ULL << CAP_FOWNER) |
+ (1ULL << CAP_FSETID) |
+ (1ULL << CAP_MKNOD) |
+ (1ULL << CAP_SETFCAP) |
+ (1ULL << CAP_DAC_OVERRIDE);
+
+ /* Child */
+
+ reset_all_signal_handlers();
+ reset_signal_mask();
+ assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
+
+ pipefd[1] = safe_close(pipefd[1]);
+
+ if (dup2(pipefd[0], STDIN_FILENO) != STDIN_FILENO) {
+ log_error_errno(errno, "Failed to dup2() fd: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ if (pipefd[0] != STDIN_FILENO)
+ pipefd[0] = safe_close(pipefd[0]);
+
+ null_fd = open("/dev/null", O_WRONLY|O_NOCTTY);
+ if (null_fd < 0) {
+ log_error_errno(errno, "Failed to open /dev/null: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ if (dup2(null_fd, STDOUT_FILENO) != STDOUT_FILENO) {
+ log_error_errno(errno, "Failed to dup2() fd: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ if (null_fd != STDOUT_FILENO)
+ null_fd = safe_close(null_fd);
+
+ fd_cloexec(STDIN_FILENO, false);
+ fd_cloexec(STDOUT_FILENO, false);
+ fd_cloexec(STDERR_FILENO, false);
+
+ if (unshare(CLONE_NEWNET) < 0)
+ log_error_errno(errno, "Failed to lock tar into network namespace, ignoring: %m");
+
+ r = capability_bounding_set_drop(~retain, true);
+ if (r < 0)
+ log_error_errno(r, "Failed to drop capabilities, ignoring: %m");
+
+ execlp("tar", "tar", "--numeric-owner", "-C", path, "-px", NULL);
+ log_error_errno(errno, "Failed to execute tar: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ pipefd[0] = safe_close(pipefd[0]);
+ r = pipefd[1];
+ pipefd[1] = -1;
+
+ *ret = pid;
+
+ return r;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-13 03:13:10 +0000