mirror of
https://github.com/morgan9e/systemd
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8f20b498bd
A while back we introduced image_name_is_valid() for validating image file names. It's more liberal than hostname_is_valid() in many ways (and allows version suffixes and such). Since importd deals in offline images (as opposed to machined otherwise which deals in running machines), let's hence use the right helper to validate the identifiers.
667 lines
23 KiB
C
667 lines
23 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 "discover-image.h"
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#include "escape.h"
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#include "fd-util.h"
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#include "hostname-util.h"
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#include "io-util.h"
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#include "memory-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 "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 "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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int r;
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assert(url);
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assert(image_root);
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assert(etags);
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_cleanup_free_ char *escaped_url = xescape(url, FILENAME_ESCAPE);
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if (!escaped_url)
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return -ENOMEM;
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_cleanup_closedir_ DIR *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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_cleanup_strv_free_ char **ans = NULL;
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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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ssize_t l = cunescape_length(a, b - a, 0, &u);
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if (l < 0) {
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assert(l >= INT8_MIN);
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return l;
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}
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if (!http_etag_is_valid(u))
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continue;
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r = strv_consume(&ans, 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(ans);
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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(image_root);
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assert(ret);
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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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ImportVerify verify,
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CurlGlue *glue,
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PullJobOpenDisk on_open_disk,
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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_open_disk = on_open_disk;
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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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job->calc_checksum = IN_SET(verify, IMPORT_VERIFY_CHECKSUM, IMPORT_VERIFY_SIGNATURE);
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*ret = TAKE_PTR(job);
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return 0;
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}
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static bool is_checksum_file(const char *fn) {
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/* Returns true if the specified filename refers to a checksum file we grok */
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if (!fn)
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return false;
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return streq(fn, "SHA256SUMS") || endswith(fn, ".sha256");
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}
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static bool is_signature_file(const char *fn) {
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/* Returns true if the specified filename refers to a signature file we grok (reminder:
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* suse-style .sha256 files are inline signed) */
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if (!fn)
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return false;
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return streq(fn, "SHA256SUMS.gpg") || endswith(fn, ".sha256");
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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 *checksum, /* set if literal checksum verification is requested, in which case 'verify' is set to _IMPORT_VERIFY_INVALID */
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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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_cleanup_free_ char *fn = NULL;
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int r;
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assert(ret_checksum_job);
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assert(ret_signature_job);
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assert(verify == _IMPORT_VERIFY_INVALID || verify < _IMPORT_VERIFY_MAX);
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assert(verify == _IMPORT_VERIFY_INVALID || verify >= 0);
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assert((verify < 0) || !checksum);
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assert(url);
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assert(glue);
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/* If verification is turned off, or if the checksum to validate is already specified we don't need
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* to download a checksum file or signature, hence shortcut things */
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if (verify == IMPORT_VERIFY_NO || checksum) {
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*ret_checksum_job = *ret_signature_job = NULL;
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return 0;
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}
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r = import_url_last_component(url, &fn);
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if (r < 0 && r != -EADDRNOTAVAIL) /* EADDRNOTAVAIL means there was no last component, which is OK for
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* us, we'll just assume it's not a checksum/signature file */
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return r;
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/* Acquire the checksum file if verification or signature verification is requested and the main file
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* to acquire isn't a checksum or signature file anyway */
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if (verify != IMPORT_VERIFY_NO && !is_checksum_file(fn) && !is_signature_file(fn)) {
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_cleanup_free_ char *checksum_url = NULL;
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const char *suffixed = NULL;
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/* Queue jobs for the checksum file for the image. */
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if (fn)
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suffixed = strjoina(fn, ".sha256"); /* Start with the suse-style checksum (if there's a base filename) */
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else
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suffixed = "SHA256SUMS";
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r = import_url_change_last_component(url, suffixed, &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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checksum_job->on_not_found = pull_job_restart_with_sha256sum; /* if this fails, look for ubuntu-style checksum */
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}
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if (verify == IMPORT_VERIFY_SIGNATURE && !is_signature_file(fn)) {
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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 = TAKE_PTR(checksum_job);
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*ret_signature_job = TAKE_PTR(signature_job);
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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_error_errno(r, "Failed to extract filename from URL '%s': %m", job->url);
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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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if (is_checksum_file(fn) || is_signature_file(fn)) /* We cannot verify checksum files or signature files with a checksum file */
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return log_error_errno(SYNTHETIC_ERRNO(ELOOP),
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"Cannot verify checksum/signature files via themselves.");
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line = strjoina(job->checksum, " *", fn, "\n"); /* string for binary mode */
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p = memmem_safe(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"); /* string for text mode */
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p = memmem_safe(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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/* Only counts if found at beginning of a line */
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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 check out, 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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static int verify_gpg(
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const void *payload, size_t payload_size,
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const void *signature, size_t signature_size) {
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_cleanup_close_pair_ int gpg_pipe[2] = EBADF_PAIR;
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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(payload || payload_size == 0);
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assert(signature || signature_size == 0);
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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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if (signature_size > 0) {
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_cleanup_close_ int sig_file = -EBADF;
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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, signature_size);
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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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}
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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_full("(gpg)",
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(int[]) { gpg_pipe[0], -EBADF, STDERR_FILENO },
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NULL, 0,
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FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG_SIGTERM|FORK_REARRANGE_STDIO|FORK_LOG|FORK_RLIMIT_NOFILE_SAFE,
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&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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size_t k = ELEMENTSOF(cmd) - 6;
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/* Child */
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cmd[k++] = strjoina("--homedir=", gpg_home);
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/* We add the user keyring only to the command line 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 (signature) {
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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], payload, payload_size);
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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", TAKE_PID(pid), WAIT_LOG_ABNORMAL);
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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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r = log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
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"DOWNLOAD INVALID: Signature verification failed.");
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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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if (signature_size > 0)
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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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int pull_verify(ImportVerify verify,
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const char *checksum, /* Verify with literal checksum */
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PullJob *main_job,
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PullJob *checksum_job,
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PullJob *signature_job,
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PullJob *settings_job,
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PullJob *roothash_job,
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PullJob *roothash_signature_job,
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PullJob *verity_job) {
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_cleanup_free_ char *fn = NULL;
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VerificationStyle style;
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PullJob *verify_job;
|
|
int r;
|
|
|
|
assert(verify == _IMPORT_VERIFY_INVALID || verify < _IMPORT_VERIFY_MAX);
|
|
assert(verify == _IMPORT_VERIFY_INVALID || verify >= 0);
|
|
assert((verify < 0) || !checksum);
|
|
assert(main_job);
|
|
assert(main_job->state == PULL_JOB_DONE);
|
|
|
|
if (verify == IMPORT_VERIFY_NO) /* verification turned off */
|
|
return 0;
|
|
|
|
if (checksum) {
|
|
/* Verification by literal checksum */
|
|
assert(!checksum_job);
|
|
assert(!signature_job);
|
|
assert(!settings_job);
|
|
assert(!roothash_job);
|
|
assert(!roothash_signature_job);
|
|
assert(!verity_job);
|
|
|
|
assert(main_job->calc_checksum);
|
|
assert(main_job->checksum);
|
|
|
|
if (!strcaseeq(checksum, main_job->checksum))
|
|
return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
|
|
"DOWNLOAD INVALID: Checksum of %s file did not check out, file has been tampered with.",
|
|
main_job->url);
|
|
|
|
return 0;
|
|
}
|
|
|
|
r = import_url_last_component(main_job->url, &fn);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to extract filename from URL '%s': %m", main_job->url);
|
|
|
|
if (is_signature_file(fn))
|
|
return log_error_errno(SYNTHETIC_ERRNO(ELOOP),
|
|
"Main download is a signature file, can't verify it.");
|
|
|
|
if (is_checksum_file(fn)) {
|
|
log_debug("Main download is a checksum file, can't validate its checksum with itself, skipping.");
|
|
verify_job = main_job;
|
|
} else {
|
|
assert(main_job->calc_checksum);
|
|
assert(main_job->checksum);
|
|
assert(checksum_job);
|
|
assert(checksum_job->state == PULL_JOB_DONE);
|
|
|
|
if (!checksum_job->payload || checksum_job->payload_size <= 0)
|
|
return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
|
|
"Checksum is empty, cannot verify.");
|
|
|
|
PullJob *j;
|
|
FOREACH_ARGUMENT(j, main_job, settings_job, roothash_job, roothash_signature_job, verity_job) {
|
|
r = verify_one(checksum_job, j);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
verify_job = checksum_job;
|
|
}
|
|
|
|
if (verify != IMPORT_VERIFY_SIGNATURE)
|
|
return 0;
|
|
|
|
assert(verify_job);
|
|
|
|
r = verification_style_from_url(verify_job->url, &style);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to determine verification style from URL '%s': %m", verify_job->url);
|
|
|
|
if (style == VERIFICATION_PER_DIRECTORY) {
|
|
assert(signature_job);
|
|
assert(signature_job->state == PULL_JOB_DONE);
|
|
|
|
if (!signature_job->payload || signature_job->payload_size <= 0)
|
|
return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
|
|
"Signature is empty, cannot verify.");
|
|
|
|
return verify_gpg(verify_job->payload, verify_job->payload_size, signature_job->payload, signature_job->payload_size);
|
|
} else
|
|
return verify_gpg(verify_job->payload, verify_job->payload_size, NULL, 0);
|
|
}
|
|
|
|
int verification_style_from_url(const char *url, VerificationStyle *ret) {
|
|
_cleanup_free_ char *last = NULL;
|
|
int r;
|
|
|
|
assert(url);
|
|
assert(ret);
|
|
|
|
/* Determines which kind of verification style is appropriate for this url */
|
|
|
|
r = import_url_last_component(url, &last);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (streq(last, "SHA256SUMS")) {
|
|
*ret = VERIFICATION_PER_DIRECTORY;
|
|
return 0;
|
|
}
|
|
|
|
if (endswith(last, ".sha256")) {
|
|
*ret = VERIFICATION_PER_FILE;
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
int pull_job_restart_with_sha256sum(PullJob *j, char **ret) {
|
|
VerificationStyle style;
|
|
int r;
|
|
|
|
assert(j);
|
|
|
|
/* Generic implementation of a PullJobNotFound handler, that restarts the job requesting SHA256SUMS */
|
|
|
|
r = verification_style_from_url(j->url, &style);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to determine verification style of URL '%s': %m", j->url);
|
|
|
|
if (style == VERIFICATION_PER_DIRECTORY) /* Nothing to do anymore */
|
|
return 0;
|
|
|
|
assert(style == VERIFICATION_PER_FILE); /* This must have been .sha256 style URL before */
|
|
|
|
log_debug("Got 404 for %s, now trying to get SHA256SUMS instead.", j->url);
|
|
|
|
r = import_url_change_last_component(j->url, "SHA256SUMS", ret);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to replace SHA256SUMS suffix: %m");
|
|
|
|
return 1;
|
|
}
|
|
|
|
bool pull_validate_local(const char *name, ImportFlags flags) {
|
|
|
|
if (FLAGS_SET(flags, IMPORT_DIRECT))
|
|
return path_is_valid(name);
|
|
|
|
return image_name_is_valid(name);
|
|
}
|
|
|
|
int pull_url_needs_checksum(const char *url) {
|
|
_cleanup_free_ char *fn = NULL;
|
|
int r;
|
|
|
|
/* Returns true if we need to validate this resource via a hash value. This returns true for all
|
|
* files — except for gpg signature files and SHA256SUMS files and the like, which are validated with
|
|
* a validation tool like gpg. */
|
|
|
|
r = import_url_last_component(url, &fn);
|
|
if (r == -EADDRNOTAVAIL) /* no last component? then let's assume it's not a signature/checksum file */
|
|
return false;
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return !is_checksum_file(fn) && !is_signature_file(fn);
|
|
}
|