[thirdparty/systemd.git] / src / import / pull-common.c

/* SPDX-License-Identifier: LGPL-2.1+ */

#include <sys/prctl.h>

#include "alloc-util.h"
#include "btrfs-util.h"
#include "capability-util.h"
#include "copy.h"
#include "dirent-util.h"
#include "escape.h"
#include "fd-util.h"
#include "io-util.h"
#include "path-util.h"
#include "process-util.h"
#include "pull-common.h"
#include "pull-job.h"
#include "rm-rf.h"
#include "signal-util.h"
#include "siphash24.h"
#include "string-util.h"
#include "strv.h"
#include "util.h"
#include "web-util.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 = TAKE_PTR(l);

        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|
                                  BTRFS_SNAPSHOT_FALLBACK_COPY|
                                  BTRFS_SNAPSHOT_FALLBACK_DIRECTORY|
                                  BTRFS_SNAPSHOT_RECURSIVE);
        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));
        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));
                if (!path)
                        return -ENOMEM;
        }

        *ret = path;
        return 0;
}

int pull_make_auxiliary_job(
                PullJob **ret,
                const char *url,
                int (*strip_suffixes)(const char *name, char **ret),
                const char *suffix,
                CurlGlue *glue,
                PullJobFinished on_finished,
                void *userdata) {

        _cleanup_free_ char *last_component = NULL, *ll = NULL, *auxiliary_url = NULL;
        _cleanup_(pull_job_unrefp) PullJob *job = NULL;
        const char *q;
        int r;

        assert(ret);
        assert(url);
        assert(strip_suffixes);
        assert(glue);

        r = import_url_last_component(url, &last_component);
        if (r < 0)
                return r;

        r = strip_suffixes(last_component, &ll);
        if (r < 0)
                return r;

        q = strjoina(ll, suffix);

        r = import_url_change_last_component(url, q, &auxiliary_url);
        if (r < 0)
                return r;

        r = pull_job_new(&job, auxiliary_url, glue, userdata);
        if (r < 0)
                return r;

        job->on_finished = on_finished;
        job->compressed_max = job->uncompressed_max = 1ULL * 1024ULL * 1024ULL;

        *ret = TAKE_PTR(job);

        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;
        const char *chksums = NULL;

        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, *fn = NULL;

                /* Queue jobs for the checksum file for the image. */
                r = import_url_last_component(url, &fn);
                if (r < 0)
                        return r;

                chksums = strjoina(fn, ".sha256");

                r = import_url_change_last_component(url, chksums, &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;
}

static int verify_one(PullJob *checksum_job, PullJob *job) {
        _cleanup_free_ char *fn = NULL;
        const char *line, *p;
        int r;

        assert(checksum_job);

        if (!job)
                return 0;

        assert(IN_SET(job->state, PULL_JOB_DONE, PULL_JOB_FAILED));

        /* Don't verify the checksum if we didn't actually successfully download something new */
        if (job->state != PULL_JOB_DONE)
                return 0;
        if (job->error != 0)
                return 0;
        if (job->etag_exists)
                return 0;

        assert(job->calc_checksum);
        assert(job->checksum);

        r = import_url_last_component(job->url, &fn);
        if (r < 0)
                return log_oom();

        if (!filename_is_valid(fn))
                return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
                                       "Cannot verify checksum, could not determine server-side file name.");

        line = strjoina(job->checksum, " *", fn, "\n");

        p = memmem(checksum_job->payload,
                   checksum_job->payload_size,
                   line,
                   strlen(line));

        if (!p) {
                line = strjoina(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'))
                return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
                                       "DOWNLOAD INVALID: Checksum of %s file did not checkout, file has been tampered with.", fn);

        log_info("SHA256 checksum of %s is valid.", job->url);
        return 1;
}

int pull_verify(PullJob *main_job,
                PullJob *roothash_job,
                PullJob *settings_job,
                PullJob *checksum_job,
                PullJob *signature_job) {

        _cleanup_close_pair_ int gpg_pipe[2] = { -1, -1 };
        _cleanup_close_ int sig_file = -1;
        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 = verify_one(checksum_job, main_job);
        if (r < 0)
                return r;

        r = verify_one(checksum_job, roothash_job);
        if (r < 0)
                return r;

        r = verify_one(checksum_job, settings_job);
        if (r < 0)
                return r;

        if (!signature_job)
                return 0;

        if (checksum_job->style == VERIFICATION_PER_FILE)
                signature_job = checksum_job;

        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;

        r = safe_fork("(gpg)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &pid);
        if (r < 0)
                return r;
        if (r == 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;

                /* Child */

                gpg_pipe[1] = safe_close(gpg_pipe[1]);

                r = rearrange_stdio(gpg_pipe[0], -1, STDERR_FILENO);
                if (r < 0) {
                        log_error_errno(r, "Failed to rearrange stdin/stdout: %m");
                        _exit(EXIT_FAILURE);
                }

                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";
                if (checksum_job->style == VERIFICATION_PER_DIRECTORY) {
                        cmd[k++] = sig_file_path;
                        cmd[k++] = "-";
                        cmd[k++] = NULL;
                }

                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_check("gpg", pid, WAIT_LOG_ABNORMAL);
        pid = 0;
        if (r < 0)
                goto finish;
        if (r != EXIT_SUCCESS) {
                log_error("DOWNLOAD INVALID: Signature verification failed.");
                r = -EBADMSG;
        } else {
                log_info("Signature verification succeeded.");
                r = 0;
        }

finish:
        (void) unlink(sig_file_path);

        if (gpg_home_created)
                (void) rm_rf(gpg_home, REMOVE_ROOT|REMOVE_PHYSICAL);

        return r;
}
Commit	Line	Data
53e1b683	1	/* SPDX-License-Identifier: LGPL-2.1+ */
56ebfaf1	2
98c38001 LP	3	#include <sys/prctl.h>
98c38001 LP	4
b5efdb8a	5	#include "alloc-util.h"
56ebfaf1	6	#include "btrfs-util.h"
430f0182	7	#include "capability-util.h"
4f5dd394	8	#include "copy.h"
a0956174	9	#include "dirent-util.h"
4f5dd394	10	#include "escape.h"
3ffd4af2	11	#include "fd-util.h"
c004493c	12	#include "io-util.h"
bb15fafe	13	#include "path-util.h"
0b452006	14	#include "process-util.h"
3ffd4af2	15	#include "pull-common.h"
4f5dd394 LP	16	#include "pull-job.h"
4f5dd394 LP	17	#include "rm-rf.h"
24882e06	18	#include "signal-util.h"
9818005d	19	#include "siphash24.h"
07630cea	20	#include "string-util.h"
4f5dd394 LP	21	#include "strv.h"
4f5dd394 LP	22	#include "util.h"
49cf4170	23	#include "web-util.h"
56ebfaf1 LP	24
56ebfaf1 LP	25	#define FILENAME_ESCAPE "/.#\"\'"
9818005d	26	#define HASH_URL_THRESHOLD_LENGTH (_POSIX_PATH_MAX - 16)
56ebfaf1	27
9854730b LP	28	int pull_find_old_etags(
	29	const char *url,
	30	const char *image_root,
	31	int dt,
	32	const char *prefix,
	33	const char *suffix,
	34	char ***etags) {
	35
56ebfaf1 LP	36	_cleanup_free_ char *escaped_url = NULL;
	37	_cleanup_closedir_ DIR *d = NULL;
	38	_cleanup_strv_free_ char **l = NULL;
	39	struct dirent *de;
	40	int r;
	41
	42	assert(url);
	43	assert(etags);
	44
	45	if (!image_root)
	46	image_root = "/var/lib/machines";
	47
	48	escaped_url = xescape(url, FILENAME_ESCAPE);
	49	if (!escaped_url)
	50	return -ENOMEM;
	51
	52	d = opendir(image_root);
	53	if (!d) {
	54	if (errno == ENOENT) {
	55	*etags = NULL;
	56	return 0;
	57	}
	58
	59	return -errno;
	60	}
	61
	62	FOREACH_DIRENT_ALL(de, d, return -errno) {
	63	const char a, b;
	64	char *u;
	65
	66	if (de->d_type != DT_UNKNOWN &&
	67	de->d_type != dt)
	68	continue;
	69
	70	if (prefix) {
	71	a = startswith(de->d_name, prefix);
	72	if (!a)
	73	continue;
	74	} else
	75	a = de->d_name;
	76
	77	a = startswith(a, escaped_url);
	78	if (!a)
	79	continue;
	80
	81	a = startswith(a, ".");
	82	if (!a)
	83	continue;
	84
	85	if (suffix) {
	86	b = endswith(de->d_name, suffix);
	87	if (!b)
	88	continue;
	89	} else
	90	b = strchr(de->d_name, 0);
	91
	92	if (a >= b)
	93	continue;
	94
527b7a42 LP	95	r = cunescape_length(a, b - a, 0, &u);
	96	if (r < 0)
	97	return r;
56ebfaf1 LP	98
	99	if (!http_etag_is_valid(u)) {
	100	free(u);
	101	continue;
	102	}
	103
	104	r = strv_consume(&l, u);
	105	if (r < 0)
	106	return r;
	107	}
	108
ae2a15bc	109	*etags = TAKE_PTR(l);
56ebfaf1 LP	110
	111	return 0;
	112	}
	113
dc2c282b	114	int pull_make_local_copy(const char final, const char image_root, const char *local, bool force_local) {
56ebfaf1 LP	115	const char *p;
	116	int r;
	117
	118	assert(final);
	119	assert(local);
	120
	121	if (!image_root)
	122	image_root = "/var/lib/machines";
	123
63c372cb	124	p = strjoina(image_root, "/", local);
56ebfaf1	125
d9e2daaf LP	126	if (force_local)
d9e2daaf LP	127	(void) rm_rf(p, REMOVE_ROOT\|REMOVE_PHYSICAL\|REMOVE_SUBVOLUME);
56ebfaf1	128
17cbb288 LP	129	r = btrfs_subvol_snapshot(final, p,
	130	BTRFS_SNAPSHOT_QUOTA\|
	131	BTRFS_SNAPSHOT_FALLBACK_COPY\|
	132	BTRFS_SNAPSHOT_FALLBACK_DIRECTORY\|
	133	BTRFS_SNAPSHOT_RECURSIVE);
	134	if (r < 0)
56ebfaf1 LP	135	return log_error_errno(r, "Failed to create local image: %m");
	136
	137	log_info("Created new local image '%s'.", local);
	138
	139	return 0;
	140	}
	141
9818005d JS	142	static int hash_url(const char url, char *ret) {
	143	uint64_t h;
	144	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);
	145
	146	assert(url);
	147
933f9cae	148	h = siphash24(url, strlen(url), k.bytes);
9818005d JS	149	if (asprintf(ret, "%"PRIx64, h) < 0)
	150	return -ENOMEM;
	151
	152	return 0;
	153	}
	154
dc2c282b	155	int pull_make_path(const char url, const char etag, const char image_root, const char prefix, const char suffix, char *ret) {
9818005d	156	_cleanup_free_ char escaped_url = NULL, escaped_etag = NULL;
56ebfaf1 LP	157	char *path;
	158
	159	assert(url);
	160	assert(ret);
	161
	162	if (!image_root)
	163	image_root = "/var/lib/machines";
	164
	165	escaped_url = xescape(url, FILENAME_ESCAPE);
	166	if (!escaped_url)
	167	return -ENOMEM;
	168
	169	if (etag) {
56ebfaf1 LP	170	escaped_etag = xescape(etag, FILENAME_ESCAPE);
	171	if (!escaped_etag)
	172	return -ENOMEM;
9818005d	173	}
56ebfaf1	174
9818005d	175	path = strjoin(image_root, "/", strempty(prefix), escaped_url, escaped_etag ? "." : "",
4600a396	176	strempty(escaped_etag), strempty(suffix));
56ebfaf1 LP	177	if (!path)
	178	return -ENOMEM;
	179
9818005d JS	180	/* URLs might make the path longer than the maximum allowed length for a file name.
	181	* When that happens, a URL hash is used instead. Paths returned by this function
	182	* can be later used with tempfn_random() which adds 16 bytes to the resulting name. */
	183	if (strlen(path) >= HASH_URL_THRESHOLD_LENGTH) {
	184	_cleanup_free_ char *hash = NULL;
	185	int r;
	186
	187	free(path);
	188
	189	r = hash_url(url, &hash);
	190	if (r < 0)
	191	return r;
	192
	193	path = strjoin(image_root, "/", strempty(prefix), hash, escaped_etag ? "." : "",
4600a396	194	strempty(escaped_etag), strempty(suffix));
9818005d JS	195	if (!path)
	196	return -ENOMEM;
	197	}
	198
56ebfaf1 LP	199	*ret = path;
	200	return 0;
	201	}
85dbc41d	202
91359193	203	int pull_make_auxiliary_job(
9854730b LP	204	PullJob **ret,
9854730b LP	205	const char *url,
91359193 LP	206	int (strip_suffixes)(const char name, char **ret),
91359193 LP	207	const char *suffix,
9854730b LP	208	CurlGlue *glue,
	209	PullJobFinished on_finished,
	210	void *userdata) {
	211
91359193	212	_cleanup_free_ char last_component = NULL, ll = NULL, *auxiliary_url = NULL;
9854730b LP	213	_cleanup_(pull_job_unrefp) PullJob *job = NULL;
	214	const char *q;
	215	int r;
	216
	217	assert(ret);
	218	assert(url);
91359193	219	assert(strip_suffixes);
9854730b LP	220	assert(glue);
	221
	222	r = import_url_last_component(url, &last_component);
	223	if (r < 0)
	224	return r;
	225
91359193	226	r = strip_suffixes(last_component, &ll);
9854730b LP	227	if (r < 0)
	228	return r;
	229
91359193	230	q = strjoina(ll, suffix);
9854730b	231
91359193	232	r = import_url_change_last_component(url, q, &auxiliary_url);
9854730b LP	233	if (r < 0)
	234	return r;
	235
91359193	236	r = pull_job_new(&job, auxiliary_url, glue, userdata);
9854730b LP	237	if (r < 0)
	238	return r;
	239
	240	job->on_finished = on_finished;
	241	job->compressed_max = job->uncompressed_max = 1ULL * 1024ULL * 1024ULL;
	242
1cc6c93a	243	*ret = TAKE_PTR(job);
9854730b LP	244
	245	return 0;
	246	}
	247
dc2c282b LP	248	int pull_make_verification_jobs(
	249	PullJob **ret_checksum_job,
	250	PullJob **ret_signature_job,
98c38001 LP	251	ImportVerify verify,
	252	const char *url,
	253	CurlGlue *glue,
dc2c282b	254	PullJobFinished on_finished,
98c38001 LP	255	void *userdata) {
98c38001 LP	256
dc2c282b	257	_cleanup_(pull_job_unrefp) PullJob checksum_job = NULL, signature_job = NULL;
98c38001	258	int r;
697be0be	259	const char *chksums = NULL;
98c38001 LP	260
	261	assert(ret_checksum_job);
	262	assert(ret_signature_job);
	263	assert(verify >= 0);
	264	assert(verify < _IMPORT_VERIFY_MAX);
	265	assert(url);
	266	assert(glue);
	267
	268	if (verify != IMPORT_VERIFY_NO) {
697be0be	269	_cleanup_free_ char checksum_url = NULL, fn = NULL;
98c38001	270
697be0be TB	271	/* Queue jobs for the checksum file for the image. */
	272	r = import_url_last_component(url, &fn);
	273	if (r < 0)
	274	return r;
	275
	276	chksums = strjoina(fn, ".sha256");
	277
	278	r = import_url_change_last_component(url, chksums, &checksum_url);
98c38001 LP	279	if (r < 0)
	280	return r;
	281
dc2c282b	282	r = pull_job_new(&checksum_job, checksum_url, glue, userdata);
98c38001 LP	283	if (r < 0)
	284	return r;
	285
	286	checksum_job->on_finished = on_finished;
	287	checksum_job->uncompressed_max = checksum_job->compressed_max = 1ULL * 1024ULL * 1024ULL;
	288	}
	289
	290	if (verify == IMPORT_VERIFY_SIGNATURE) {
	291	_cleanup_free_ char *signature_url = NULL;
	292
	293	/* Queue job for the SHA256SUMS.gpg file for the image. */
	294	r = import_url_change_last_component(url, "SHA256SUMS.gpg", &signature_url);
	295	if (r < 0)
	296	return r;
	297
dc2c282b	298	r = pull_job_new(&signature_job, signature_url, glue, userdata);
98c38001 LP	299	if (r < 0)
	300	return r;
	301
	302	signature_job->on_finished = on_finished;
	303	signature_job->uncompressed_max = signature_job->compressed_max = 1ULL * 1024ULL * 1024ULL;
	304	}
	305
	306	*ret_checksum_job = checksum_job;
	307	*ret_signature_job = signature_job;
	308
	309	checksum_job = signature_job = NULL;
	310
	311	return 0;
	312	}
	313
91359193	314	static int verify_one(PullJob checksum_job, PullJob job) {
98c38001	315	_cleanup_free_ char *fn = NULL;
91359193	316	const char line, p;
98c38001 LP	317	int r;
98c38001 LP	318
91359193	319	assert(checksum_job);
98c38001	320
91359193	321	if (!job)
98c38001 LP	322	return 0;
98c38001 LP	323
91359193	324	assert(IN_SET(job->state, PULL_JOB_DONE, PULL_JOB_FAILED));
98c38001	325
91359193 LP	326	/* Don't verify the checksum if we didn't actually successfully download something new */
	327	if (job->state != PULL_JOB_DONE)
	328	return 0;
	329	if (job->error != 0)
	330	return 0;
	331	if (job->etag_exists)
	332	return 0;
98c38001	333
91359193 LP	334	assert(job->calc_checksum);
	335	assert(job->checksum);
	336
	337	r = import_url_last_component(job->url, &fn);
98c38001 LP	338	if (r < 0)
	339	return log_oom();
	340
baaa35ad ZJS	341	if (!filename_is_valid(fn))
	342	return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
	343	"Cannot verify checksum, could not determine server-side file name.");
98c38001	344
91359193	345	line = strjoina(job->checksum, " *", fn, "\n");
98c38001 LP	346
	347	p = memmem(checksum_job->payload,
	348	checksum_job->payload_size,
	349	line,
	350	strlen(line));
	351
697be0be TB	352	if (!p) {
	353	line = strjoina(job->checksum, " ", fn, "\n");
	354
	355	p = memmem(checksum_job->payload,
	356	checksum_job->payload_size,
	357	line,
	358	strlen(line));
	359	}
	360
baaa35ad ZJS	361	if (!p \|\| (p != (char*) checksum_job->payload && p[-1] != '\n'))
	362	return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
	363	"DOWNLOAD INVALID: Checksum of %s file did not checkout, file has been tampered with.", fn);
98c38001	364
91359193 LP	365	log_info("SHA256 checksum of %s is valid.", job->url);
	366	return 1;
	367	}
98c38001	368
91359193 LP	369	int pull_verify(PullJob *main_job,
	370	PullJob *roothash_job,
	371	PullJob *settings_job,
	372	PullJob *checksum_job,
	373	PullJob *signature_job) {
9854730b	374
91359193	375	_cleanup_close_pair_ int gpg_pipe[2] = { -1, -1 };
91359193 LP	376	_cleanup_close_ int sig_file = -1;
	377	char sig_file_path[] = "/tmp/sigXXXXXX", gpg_home[] = "/tmp/gpghomeXXXXXX";
	378	_cleanup_(sigkill_waitp) pid_t pid = 0;
	379	bool gpg_home_created = false;
	380	int r;
9854730b	381
91359193 LP	382	assert(main_job);
91359193 LP	383	assert(main_job->state == PULL_JOB_DONE);
9854730b	384
91359193 LP	385	if (!checksum_job)
91359193 LP	386	return 0;
9854730b	387
91359193 LP	388	assert(main_job->calc_checksum);
91359193 LP	389	assert(main_job->checksum);
9854730b	390
91359193	391	assert(checksum_job->state == PULL_JOB_DONE);
9854730b	392
91359193 LP	393	if (!checksum_job->payload \|\| checksum_job->payload_size <= 0) {
	394	log_error("Checksum is empty, cannot verify.");
	395	return -EBADMSG;
	396	}
9854730b	397
91359193 LP	398	r = verify_one(checksum_job, main_job);
	399	if (r < 0)
	400	return r;
9854730b	401
91359193 LP	402	r = verify_one(checksum_job, roothash_job);
	403	if (r < 0)
	404	return r;
9854730b	405
91359193 LP	406	r = verify_one(checksum_job, settings_job);
	407	if (r < 0)
	408	return r;
9854730b	409
98c38001 LP	410	if (!signature_job)
	411	return 0;
	412
697be0be TB	413	if (checksum_job->style == VERIFICATION_PER_FILE)
	414	signature_job = checksum_job;
	415
dc2c282b	416	assert(signature_job->state == PULL_JOB_DONE);
98c38001 LP	417
	418	if (!signature_job->payload \|\| signature_job->payload_size <= 0) {
	419	log_error("Signature is empty, cannot verify.");
	420	return -EBADMSG;
	421	}
	422
	423	r = pipe2(gpg_pipe, O_CLOEXEC);
	424	if (r < 0)
0100b6e1	425	return log_error_errno(errno, "Failed to create pipe for gpg: %m");
98c38001 LP	426
	427	sig_file = mkostemp(sig_file_path, O_RDWR);
	428	if (sig_file < 0)
	429	return log_error_errno(errno, "Failed to create temporary file: %m");
	430
	431	r = loop_write(sig_file, signature_job->payload, signature_job->payload_size, false);
	432	if (r < 0) {
	433	log_error_errno(r, "Failed to write to temporary file: %m");
	434	goto finish;
	435	}
	436
0acfdffe LP	437	if (!mkdtemp(gpg_home)) {
	438	r = log_error_errno(errno, "Failed to create tempory home for gpg: %m");
	439	goto finish;
	440	}
	441
	442	gpg_home_created = true;
	443
b6e1fff1	444	r = safe_fork("(gpg)", FORK_RESET_SIGNALS\|FORK_DEATHSIG\|FORK_LOG, &pid);
4c253ed1	445	if (r < 0)
b6e1fff1	446	return r;
4c253ed1	447	if (r == 0) {
98c38001 LP	448	const char *cmd[] = {
	449	"gpg",
	450	"--no-options",
	451	"--no-default-keyring",
	452	"--no-auto-key-locate",
	453	"--no-auto-check-trustdb",
	454	"--batch",
	455	"--trust-model=always",
0acfdffe LP	456	NULL, /* --homedir= */
0acfdffe LP	457	NULL, /* --keyring= */
98c38001 LP	458	NULL, /* --verify */
	459	NULL, /* signature file */
	460	NULL, /* dash */
	461	NULL /* trailing NULL */
	462	};
0acfdffe	463	unsigned k = ELEMENTSOF(cmd) - 6;
98c38001 LP	464
	465	/* Child */
	466
98c38001 LP	467	gpg_pipe[1] = safe_close(gpg_pipe[1]);
98c38001 LP	468
2b33ab09	469	r = rearrange_stdio(gpg_pipe[0], -1, STDERR_FILENO);
046a82c1	470	if (r < 0) {
2b33ab09	471	log_error_errno(r, "Failed to rearrange stdin/stdout: %m");
98c38001 LP	472	_exit(EXIT_FAILURE);
	473	}
	474
0acfdffe LP	475	cmd[k++] = strjoina("--homedir=", gpg_home);
0acfdffe LP	476
98c38001 LP	477	/* We add the user keyring only to the command line
	478	* arguments, if it's around since gpg fails
	479	* otherwise. */
	480	if (access(USER_KEYRING_PATH, F_OK) >= 0)
	481	cmd[k++] = "--keyring=" USER_KEYRING_PATH;
1c49d1ba LP	482	else
1c49d1ba LP	483	cmd[k++] = "--keyring=" VENDOR_KEYRING_PATH;
98c38001 LP	484
98c38001 LP	485	cmd[k++] = "--verify";
697be0be TB	486	if (checksum_job->style == VERIFICATION_PER_DIRECTORY) {
	487	cmd[k++] = sig_file_path;
	488	cmd[k++] = "-";
	489	cmd[k++] = NULL;
	490	}
98c38001	491
0acfdffe	492	execvp("gpg2", (char * const *) cmd);
98c38001 LP	493	execvp("gpg", (char * const *) cmd);
	494	log_error_errno(errno, "Failed to execute gpg: %m");
	495	_exit(EXIT_FAILURE);
	496	}
	497
	498	gpg_pipe[0] = safe_close(gpg_pipe[0]);
	499
	500	r = loop_write(gpg_pipe[1], checksum_job->payload, checksum_job->payload_size, false);
	501	if (r < 0) {
	502	log_error_errno(r, "Failed to write to pipe: %m");
	503	goto finish;
	504	}
	505
	506	gpg_pipe[1] = safe_close(gpg_pipe[1]);
	507
7d4904fe	508	r = wait_for_terminate_and_check("gpg", pid, WAIT_LOG_ABNORMAL);
98c38001 LP	509	pid = 0;
	510	if (r < 0)
	511	goto finish;
b4a34311	512	if (r != EXIT_SUCCESS) {
9854730b	513	log_error("DOWNLOAD INVALID: Signature verification failed.");
98c38001 LP	514	r = -EBADMSG;
	515	} else {
	516	log_info("Signature verification succeeded.");
	517	r = 0;
	518	}
	519
	520	finish:
d61b34f1	521	(void) unlink(sig_file_path);
98c38001	522
0acfdffe	523	if (gpg_home_created)
c6878637	524	(void) rm_rf(gpg_home, REMOVE_ROOT\|REMOVE_PHYSICAL);
0acfdffe	525
98c38001 LP	526	return r;
98c38001 LP	527	}