527 lines
16 KiB
C
527 lines
16 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <sys/prctl.h>
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#include "alloc-util.h"
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#include "btrfs-util.h"
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#include "capability-util.h"
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#include "copy.h"
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#include "dirent-util.h"
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#include "escape.h"
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#include "fd-util.h"
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#include "io-util.h"
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#include "path-util.h"
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#include "process-util.h"
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#include "pull-common.h"
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#include "pull-job.h"
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#include "rlimit-util.h"
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#include "rm-rf.h"
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#include "signal-util.h"
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#include "siphash24.h"
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#include "string-util.h"
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#include "strv.h"
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#include "util.h"
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#include "web-util.h"
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#define FILENAME_ESCAPE "/.#\"\'"
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#define HASH_URL_THRESHOLD_LENGTH (_POSIX_PATH_MAX - 16)
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int pull_find_old_etags(
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const char *url,
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const char *image_root,
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int dt,
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const char *prefix,
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const char *suffix,
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char ***etags) {
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_cleanup_free_ char *escaped_url = NULL;
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_cleanup_closedir_ DIR *d = NULL;
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_cleanup_strv_free_ char **l = NULL;
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struct dirent *de;
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int r;
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assert(url);
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assert(etags);
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if (!image_root)
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image_root = "/var/lib/machines";
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escaped_url = xescape(url, FILENAME_ESCAPE);
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if (!escaped_url)
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return -ENOMEM;
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d = opendir(image_root);
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if (!d) {
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if (errno == ENOENT) {
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*etags = NULL;
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return 0;
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}
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return -errno;
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}
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FOREACH_DIRENT_ALL(de, d, return -errno) {
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_cleanup_free_ char *u = NULL;
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const char *a, *b;
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if (de->d_type != DT_UNKNOWN &&
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de->d_type != dt)
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continue;
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if (prefix) {
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a = startswith(de->d_name, prefix);
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if (!a)
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continue;
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} else
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a = de->d_name;
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a = startswith(a, escaped_url);
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if (!a)
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continue;
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a = startswith(a, ".");
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if (!a)
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continue;
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if (suffix) {
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b = endswith(de->d_name, suffix);
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if (!b)
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continue;
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} else
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b = strchr(de->d_name, 0);
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if (a >= b)
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continue;
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r = cunescape_length(a, b - a, 0, &u);
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if (r < 0)
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return r;
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if (!http_etag_is_valid(u))
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continue;
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r = strv_consume(&l, TAKE_PTR(u));
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if (r < 0)
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return r;
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}
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*etags = TAKE_PTR(l);
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return 0;
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}
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int pull_make_local_copy(const char *final, const char *image_root, const char *local, bool force_local) {
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const char *p;
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int r;
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assert(final);
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assert(local);
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if (!image_root)
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image_root = "/var/lib/machines";
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p = prefix_roota(image_root, local);
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if (force_local)
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(void) rm_rf(p, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
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r = btrfs_subvol_snapshot(final, p,
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BTRFS_SNAPSHOT_QUOTA|
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BTRFS_SNAPSHOT_FALLBACK_COPY|
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BTRFS_SNAPSHOT_FALLBACK_DIRECTORY|
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BTRFS_SNAPSHOT_RECURSIVE);
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if (r < 0)
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return log_error_errno(r, "Failed to create local image: %m");
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log_info("Created new local image '%s'.", local);
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return 0;
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}
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static int hash_url(const char *url, char **ret) {
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uint64_t h;
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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);
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assert(url);
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h = siphash24(url, strlen(url), k.bytes);
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if (asprintf(ret, "%"PRIx64, h) < 0)
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return -ENOMEM;
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return 0;
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}
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int pull_make_path(const char *url, const char *etag, const char *image_root, const char *prefix, const char *suffix, char **ret) {
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_cleanup_free_ char *escaped_url = NULL, *escaped_etag = NULL;
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char *path;
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assert(url);
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assert(ret);
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if (!image_root)
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image_root = "/var/lib/machines";
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escaped_url = xescape(url, FILENAME_ESCAPE);
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if (!escaped_url)
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return -ENOMEM;
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if (etag) {
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escaped_etag = xescape(etag, FILENAME_ESCAPE);
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if (!escaped_etag)
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return -ENOMEM;
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}
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path = strjoin(image_root, "/", strempty(prefix), escaped_url, escaped_etag ? "." : "",
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strempty(escaped_etag), strempty(suffix));
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if (!path)
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return -ENOMEM;
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/* URLs might make the path longer than the maximum allowed length for a file name.
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* When that happens, a URL hash is used instead. Paths returned by this function
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* can be later used with tempfn_random() which adds 16 bytes to the resulting name. */
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if (strlen(path) >= HASH_URL_THRESHOLD_LENGTH) {
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_cleanup_free_ char *hash = NULL;
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int r;
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free(path);
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r = hash_url(url, &hash);
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if (r < 0)
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return r;
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path = strjoin(image_root, "/", strempty(prefix), hash, escaped_etag ? "." : "",
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strempty(escaped_etag), strempty(suffix));
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if (!path)
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return -ENOMEM;
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}
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*ret = path;
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return 0;
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}
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int pull_make_auxiliary_job(
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PullJob **ret,
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const char *url,
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int (*strip_suffixes)(const char *name, char **ret),
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const char *suffix,
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CurlGlue *glue,
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PullJobFinished on_finished,
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void *userdata) {
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_cleanup_free_ char *last_component = NULL, *ll = NULL, *auxiliary_url = NULL;
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_cleanup_(pull_job_unrefp) PullJob *job = NULL;
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const char *q;
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int r;
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assert(ret);
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assert(url);
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assert(strip_suffixes);
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assert(glue);
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r = import_url_last_component(url, &last_component);
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if (r < 0)
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return r;
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r = strip_suffixes(last_component, &ll);
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if (r < 0)
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return r;
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q = strjoina(ll, suffix);
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r = import_url_change_last_component(url, q, &auxiliary_url);
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if (r < 0)
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return r;
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r = pull_job_new(&job, auxiliary_url, glue, userdata);
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if (r < 0)
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return r;
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job->on_finished = on_finished;
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job->compressed_max = job->uncompressed_max = 1ULL * 1024ULL * 1024ULL;
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*ret = TAKE_PTR(job);
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return 0;
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}
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int pull_make_verification_jobs(
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PullJob **ret_checksum_job,
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PullJob **ret_signature_job,
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ImportVerify verify,
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const char *url,
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CurlGlue *glue,
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PullJobFinished on_finished,
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void *userdata) {
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_cleanup_(pull_job_unrefp) PullJob *checksum_job = NULL, *signature_job = NULL;
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int r;
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const char *chksums = NULL;
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assert(ret_checksum_job);
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assert(ret_signature_job);
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assert(verify >= 0);
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assert(verify < _IMPORT_VERIFY_MAX);
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assert(url);
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assert(glue);
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if (verify != IMPORT_VERIFY_NO) {
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_cleanup_free_ char *checksum_url = NULL, *fn = NULL;
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/* Queue jobs for the checksum file for the image. */
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r = import_url_last_component(url, &fn);
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if (r < 0)
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return r;
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chksums = strjoina(fn, ".sha256");
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r = import_url_change_last_component(url, chksums, &checksum_url);
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if (r < 0)
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return r;
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r = pull_job_new(&checksum_job, checksum_url, glue, userdata);
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if (r < 0)
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return r;
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checksum_job->on_finished = on_finished;
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checksum_job->uncompressed_max = checksum_job->compressed_max = 1ULL * 1024ULL * 1024ULL;
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}
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if (verify == IMPORT_VERIFY_SIGNATURE) {
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_cleanup_free_ char *signature_url = NULL;
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/* Queue job for the SHA256SUMS.gpg file for the image. */
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r = import_url_change_last_component(url, "SHA256SUMS.gpg", &signature_url);
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if (r < 0)
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return r;
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r = pull_job_new(&signature_job, signature_url, glue, userdata);
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if (r < 0)
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return r;
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signature_job->on_finished = on_finished;
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signature_job->uncompressed_max = signature_job->compressed_max = 1ULL * 1024ULL * 1024ULL;
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}
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*ret_checksum_job = checksum_job;
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*ret_signature_job = signature_job;
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checksum_job = signature_job = NULL;
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return 0;
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}
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static int verify_one(PullJob *checksum_job, PullJob *job) {
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_cleanup_free_ char *fn = NULL;
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const char *line, *p;
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int r;
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assert(checksum_job);
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if (!job)
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return 0;
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assert(IN_SET(job->state, PULL_JOB_DONE, PULL_JOB_FAILED));
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/* Don't verify the checksum if we didn't actually successfully download something new */
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if (job->state != PULL_JOB_DONE)
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return 0;
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if (job->error != 0)
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return 0;
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if (job->etag_exists)
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return 0;
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assert(job->calc_checksum);
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assert(job->checksum);
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r = import_url_last_component(job->url, &fn);
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if (r < 0)
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return log_oom();
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if (!filename_is_valid(fn))
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return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
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"Cannot verify checksum, could not determine server-side file name.");
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line = strjoina(job->checksum, " *", fn, "\n");
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p = memmem(checksum_job->payload,
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checksum_job->payload_size,
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line,
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strlen(line));
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if (!p) {
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line = strjoina(job->checksum, " ", fn, "\n");
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p = memmem(checksum_job->payload,
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checksum_job->payload_size,
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line,
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strlen(line));
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}
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if (!p || (p != (char*) checksum_job->payload && p[-1] != '\n'))
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return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
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"DOWNLOAD INVALID: Checksum of %s file did not checkout, file has been tampered with.", fn);
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log_info("SHA256 checksum of %s is valid.", job->url);
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return 1;
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}
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int pull_verify(PullJob *main_job,
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PullJob *roothash_job,
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PullJob *settings_job,
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PullJob *checksum_job,
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PullJob *signature_job) {
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_cleanup_close_pair_ int gpg_pipe[2] = { -1, -1 };
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_cleanup_close_ int sig_file = -1;
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char sig_file_path[] = "/tmp/sigXXXXXX", gpg_home[] = "/tmp/gpghomeXXXXXX";
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_cleanup_(sigkill_waitp) pid_t pid = 0;
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bool gpg_home_created = false;
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int r;
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assert(main_job);
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assert(main_job->state == PULL_JOB_DONE);
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if (!checksum_job)
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return 0;
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assert(main_job->calc_checksum);
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assert(main_job->checksum);
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assert(checksum_job->state == PULL_JOB_DONE);
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if (!checksum_job->payload || checksum_job->payload_size <= 0)
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return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
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"Checksum is empty, cannot verify.");
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r = verify_one(checksum_job, main_job);
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if (r < 0)
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return r;
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r = verify_one(checksum_job, roothash_job);
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if (r < 0)
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return r;
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r = verify_one(checksum_job, settings_job);
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if (r < 0)
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return r;
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if (!signature_job)
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return 0;
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if (checksum_job->style == VERIFICATION_PER_FILE)
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signature_job = checksum_job;
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assert(signature_job->state == PULL_JOB_DONE);
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if (!signature_job->payload || signature_job->payload_size <= 0)
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return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
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"Signature is empty, cannot verify.");
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r = pipe2(gpg_pipe, O_CLOEXEC);
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if (r < 0)
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return log_error_errno(errno, "Failed to create pipe for gpg: %m");
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sig_file = mkostemp(sig_file_path, O_RDWR);
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if (sig_file < 0)
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return log_error_errno(errno, "Failed to create temporary file: %m");
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r = loop_write(sig_file, signature_job->payload, signature_job->payload_size, false);
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if (r < 0) {
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log_error_errno(r, "Failed to write to temporary file: %m");
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goto finish;
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}
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if (!mkdtemp(gpg_home)) {
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r = log_error_errno(errno, "Failed to create temporary home for gpg: %m");
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goto finish;
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}
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gpg_home_created = true;
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r = safe_fork("(gpg)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &pid);
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if (r < 0)
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return r;
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if (r == 0) {
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const char *cmd[] = {
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"gpg",
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"--no-options",
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"--no-default-keyring",
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"--no-auto-key-locate",
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"--no-auto-check-trustdb",
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"--batch",
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"--trust-model=always",
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NULL, /* --homedir= */
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NULL, /* --keyring= */
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NULL, /* --verify */
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NULL, /* signature file */
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NULL, /* dash */
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NULL /* trailing NULL */
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};
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unsigned k = ELEMENTSOF(cmd) - 6;
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/* Child */
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gpg_pipe[1] = safe_close(gpg_pipe[1]);
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r = rearrange_stdio(gpg_pipe[0], -1, STDERR_FILENO);
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if (r < 0) {
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log_error_errno(r, "Failed to rearrange stdin/stdout: %m");
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_exit(EXIT_FAILURE);
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}
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(void) rlimit_nofile_safe();
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cmd[k++] = strjoina("--homedir=", gpg_home);
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/* We add the user keyring only to the command line
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* arguments, if it's around since gpg fails
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* otherwise. */
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if (access(USER_KEYRING_PATH, F_OK) >= 0)
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cmd[k++] = "--keyring=" USER_KEYRING_PATH;
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else
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cmd[k++] = "--keyring=" VENDOR_KEYRING_PATH;
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cmd[k++] = "--verify";
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if (checksum_job->style == VERIFICATION_PER_DIRECTORY) {
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cmd[k++] = sig_file_path;
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cmd[k++] = "-";
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cmd[k++] = NULL;
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}
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execvp("gpg2", (char * const *) cmd);
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execvp("gpg", (char * const *) cmd);
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log_error_errno(errno, "Failed to execute gpg: %m");
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_exit(EXIT_FAILURE);
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}
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gpg_pipe[0] = safe_close(gpg_pipe[0]);
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r = loop_write(gpg_pipe[1], checksum_job->payload, checksum_job->payload_size, false);
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if (r < 0) {
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log_error_errno(r, "Failed to write to pipe: %m");
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goto finish;
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}
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gpg_pipe[1] = safe_close(gpg_pipe[1]);
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r = wait_for_terminate_and_check("gpg", pid, WAIT_LOG_ABNORMAL);
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pid = 0;
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if (r < 0)
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goto finish;
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if (r != EXIT_SUCCESS) {
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log_error("DOWNLOAD INVALID: Signature verification failed.");
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r = -EBADMSG;
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} else {
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log_info("Signature verification succeeded.");
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r = 0;
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}
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finish:
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(void) unlink(sig_file_path);
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if (gpg_home_created)
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(void) rm_rf(gpg_home, REMOVE_ROOT|REMOVE_PHYSICAL);
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return r;
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}
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