./tools/notsd-move

1 files changed, 548 insertions, 0 deletions

diff --git a/src/grp-machine/grp-import/systemd-pull/pull-common.c b/src/grp-machine/grp-import/systemd-pull/pull-common.c
new file mode 100644
index 0000000000..9830d8a10f
--- /dev/null
+++ b/src/grp-machine/grp-import/systemd-pull/pull-common.c
@@ -0,0 +1,548 @@
+/***
+  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 "systemd-basic/alloc-util.h"
+#include "systemd-basic/btrfs-util.h"
+#include "systemd-basic/capability-util.h"
+#include "systemd-basic/copy.h"
+#include "systemd-basic/dirent-util.h"
+#include "systemd-basic/escape.h"
+#include "systemd-basic/fd-util.h"
+#include "systemd-basic/io-util.h"
+#include "systemd-basic/path-util.h"
+#include "systemd-basic/process-util.h"
+#include "systemd-basic/rm-rf.h"
+#include "systemd-basic/signal-util.h"
+#include "systemd-basic/siphash24.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/strv.h"
+#include "systemd-basic/util.h"
+#include "systemd-basic/web-util.h"
+
+#include "pull-common.h"
+#include "pull-job.h"
+
+#define FILENAME_ESCAPE "/.#\"\'"
+#define HASH_URL_THRESHOLD_LENGTH (_POSIX_PATH_MAX - 16)
+
+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;
+
+                r = cunescape_length(a, b - a, 0, &u);
+                if (r < 0)
+                        return r;
+
+                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) rm_rf(p, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
+
+        r = btrfs_subvol_snapshot(final, p, BTRFS_SNAPSHOT_QUOTA);
+        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;
+}
+
+static int hash_url(const char *url, char **ret) {
+        uint64_t h;
+        static const sd_id128_t k = SD_ID128_ARRAY(df,89,16,87,01,cc,42,30,98,ab,4a,19,a6,a5,63,4f);
+
+        assert(url);
+
+        h = siphash24(url, strlen(url), k.bytes);
+        if (asprintf(ret, "%"PRIx64, h) < 0)
+                return -ENOMEM;
+
+        return 0;
+}
+
+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, *escaped_etag = 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) {
+                escaped_etag = xescape(etag, FILENAME_ESCAPE);
+                if (!escaped_etag)
+                        return -ENOMEM;
+        }
+
+        path = strjoin(image_root, "/", strempty(prefix), escaped_url, escaped_etag ? "." : "",
+                       strempty(escaped_etag), strempty(suffix), NULL);
+        if (!path)
+                return -ENOMEM;
+
+        /* URLs might make the path longer than the maximum allowed length for a file name.
+         * When that happens, a URL hash is used instead. Paths returned by this function
+         * can be later used with tempfn_random() which adds 16 bytes to the resulting name. */
+        if (strlen(path) >= HASH_URL_THRESHOLD_LENGTH) {
+                _cleanup_free_ char *hash = NULL;
+                int r;
+
+                free(path);
+
+                r = hash_url(url, &hash);
+                if (r < 0)
+                        return r;
+
+                path = strjoin(image_root, "/", strempty(prefix), hash, escaped_etag ? "." : "",
+                               strempty(escaped_etag), strempty(suffix), NULL);
+                if (!path)
+                        return -ENOMEM;
+        }
+
+        *ret = path;
+        return 0;
+}
+
+int pull_make_settings_job(
+                PullJob **ret,
+                const char *url,
+                CurlGlue *glue,
+                PullJobFinished on_finished,
+                void *userdata) {
+
+        _cleanup_free_ char *last_component = NULL, *ll = NULL, *settings_url = NULL;
+        _cleanup_(pull_job_unrefp) PullJob *job = NULL;
+        const char *q;
+        int r;
+
+        assert(ret);
+        assert(url);
+        assert(glue);
+
+        r = import_url_last_component(url, &last_component);
+        if (r < 0)
+                return r;
+
+        r = tar_strip_suffixes(last_component, &ll);
+        if (r < 0)
+                return r;
+
+        q = strjoina(ll, ".nspawn");
+
+        r = import_url_change_last_component(url, q, &settings_url);
+        if (r < 0)
+                return r;
+
+        r = pull_job_new(&job, settings_url, glue, userdata);
+        if (r < 0)
+                return r;
+
+        job->on_finished = on_finished;
+        job->compressed_max = job->uncompressed_max = 1ULL * 1024ULL * 1024ULL;
+
+        *ret = job;
+        job = NULL;
+
+        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 *settings_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_waitp) 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("DOWNLOAD INVALID: Checksum did not check out, payload has been tampered with.");
+                return -EBADMSG;
+        }
+
+        log_info("SHA256 checksum of %s is valid.", main_job->url);
+
+        assert(!settings_job || IN_SET(settings_job->state, PULL_JOB_DONE, PULL_JOB_FAILED));
+
+        if (settings_job &&
+            settings_job->state == PULL_JOB_DONE &&
+            settings_job->error == 0 &&
+            !settings_job->etag_exists) {
+
+                _cleanup_free_ char *settings_fn = NULL;
+
+                assert(settings_job->calc_checksum);
+                assert(settings_job->checksum);
+
+                r = import_url_last_component(settings_job->url, &settings_fn);
+                if (r < 0)
+                        return log_oom();
+
+                if (!filename_is_valid(settings_fn)) {
+                        log_error("Cannot verify checksum, could not determine server-side settings file name.");
+                        return -EBADMSG;
+                }
+
+                line = strjoina(settings_job->checksum, " *", settings_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("DOWNLOAD INVALID: Checksum of settings file did not checkout, settings file has been tampered with.");
+                        return -EBADMSG;
+                }
+
+                log_info("SHA256 checksum of %s is valid.", settings_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 */
+
+                (void) reset_all_signal_handlers();
+                (void) 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;
+
+                stdio_unset_cloexec();
+
+                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("DOWNLOAD INVALID: Signature verification failed.");
+                r = -EBADMSG;
+        } else {
+                log_info("Signature verification succeeded.");
+                r = 0;
+        }
+
+finish:
+        if (sig_file >= 0)
+                (void) unlink(sig_file_path);
+
+        if (gpg_home_created)
+                (void) rm_rf(gpg_home, REMOVE_ROOT|REMOVE_PHYSICAL);
+
+        return r;
+}