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

/* SPDX-License-Identifier: LGPL-2.1+ */
/***
  This file is part of systemd.

  Copyright 2015 Lennart Poettering
***/

#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)) {
                log_error("Cannot verify checksum, could not determine server-side file name.");
                return -EBADMSG;
        }

        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')) {
                log_error("DOWNLOAD INVALID: Checksum of %s file did not checkout, file has been tampered with.", fn);
                return -EBADMSG;
        }

        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:
        if (sig_file >= 0)
                (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 LP	2	/***
	3	This file is part of systemd.
	4
	5	Copyright 2015 Lennart Poettering
56ebfaf1 LP	6	***/
56ebfaf1 LP	7
98c38001 LP	8	#include <sys/prctl.h>
98c38001 LP	9
b5efdb8a	10	#include "alloc-util.h"
56ebfaf1	11	#include "btrfs-util.h"
430f0182	12	#include "capability-util.h"
4f5dd394	13	#include "copy.h"
a0956174	14	#include "dirent-util.h"
4f5dd394	15	#include "escape.h"
3ffd4af2	16	#include "fd-util.h"
c004493c	17	#include "io-util.h"
bb15fafe	18	#include "path-util.h"
0b452006	19	#include "process-util.h"
3ffd4af2	20	#include "pull-common.h"
4f5dd394 LP	21	#include "pull-job.h"
4f5dd394 LP	22	#include "rm-rf.h"
24882e06	23	#include "signal-util.h"
9818005d	24	#include "siphash24.h"
07630cea	25	#include "string-util.h"
4f5dd394 LP	26	#include "strv.h"
4f5dd394 LP	27	#include "util.h"
49cf4170	28	#include "web-util.h"
56ebfaf1 LP	29
56ebfaf1 LP	30	#define FILENAME_ESCAPE "/.#\"\'"
9818005d	31	#define HASH_URL_THRESHOLD_LENGTH (_POSIX_PATH_MAX - 16)
56ebfaf1	32
9854730b LP	33	int pull_find_old_etags(
	34	const char *url,
	35	const char *image_root,
	36	int dt,
	37	const char *prefix,
	38	const char *suffix,
	39	char ***etags) {
	40
56ebfaf1 LP	41	_cleanup_free_ char *escaped_url = NULL;
	42	_cleanup_closedir_ DIR *d = NULL;
	43	_cleanup_strv_free_ char **l = NULL;
	44	struct dirent *de;
	45	int r;
	46
	47	assert(url);
	48	assert(etags);
	49
	50	if (!image_root)
	51	image_root = "/var/lib/machines";
	52
	53	escaped_url = xescape(url, FILENAME_ESCAPE);
	54	if (!escaped_url)
	55	return -ENOMEM;
	56
	57	d = opendir(image_root);
	58	if (!d) {
	59	if (errno == ENOENT) {
	60	*etags = NULL;
	61	return 0;
	62	}
	63
	64	return -errno;
	65	}
	66
	67	FOREACH_DIRENT_ALL(de, d, return -errno) {
	68	const char a, b;
	69	char *u;
	70
	71	if (de->d_type != DT_UNKNOWN &&
	72	de->d_type != dt)
	73	continue;
	74
	75	if (prefix) {
	76	a = startswith(de->d_name, prefix);
	77	if (!a)
	78	continue;
	79	} else
	80	a = de->d_name;
	81
	82	a = startswith(a, escaped_url);
	83	if (!a)
	84	continue;
	85
	86	a = startswith(a, ".");
	87	if (!a)
	88	continue;
	89
	90	if (suffix) {
	91	b = endswith(de->d_name, suffix);
	92	if (!b)
	93	continue;
	94	} else
	95	b = strchr(de->d_name, 0);
	96
	97	if (a >= b)
	98	continue;
	99
527b7a42 LP	100	r = cunescape_length(a, b - a, 0, &u);
	101	if (r < 0)
	102	return r;
56ebfaf1 LP	103
	104	if (!http_etag_is_valid(u)) {
	105	free(u);
	106	continue;
	107	}
	108
	109	r = strv_consume(&l, u);
	110	if (r < 0)
	111	return r;
	112	}
	113
ae2a15bc	114	*etags = TAKE_PTR(l);
56ebfaf1 LP	115
	116	return 0;
	117	}
	118
dc2c282b	119	int pull_make_local_copy(const char final, const char image_root, const char *local, bool force_local) {
56ebfaf1 LP	120	const char *p;
	121	int r;
	122
	123	assert(final);
	124	assert(local);
	125
	126	if (!image_root)
	127	image_root = "/var/lib/machines";
	128
63c372cb	129	p = strjoina(image_root, "/", local);
56ebfaf1	130
d9e2daaf LP	131	if (force_local)
d9e2daaf LP	132	(void) rm_rf(p, REMOVE_ROOT\|REMOVE_PHYSICAL\|REMOVE_SUBVOLUME);
56ebfaf1	133
17cbb288 LP	134	r = btrfs_subvol_snapshot(final, p,
	135	BTRFS_SNAPSHOT_QUOTA\|
	136	BTRFS_SNAPSHOT_FALLBACK_COPY\|
	137	BTRFS_SNAPSHOT_FALLBACK_DIRECTORY\|
	138	BTRFS_SNAPSHOT_RECURSIVE);
	139	if (r < 0)
56ebfaf1 LP	140	return log_error_errno(r, "Failed to create local image: %m");
	141
	142	log_info("Created new local image '%s'.", local);
	143
	144	return 0;
	145	}
	146
9818005d JS	147	static int hash_url(const char url, char *ret) {
	148	uint64_t h;
	149	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);
	150
	151	assert(url);
	152
933f9cae	153	h = siphash24(url, strlen(url), k.bytes);
9818005d JS	154	if (asprintf(ret, "%"PRIx64, h) < 0)
	155	return -ENOMEM;
	156
	157	return 0;
	158	}
	159
dc2c282b	160	int pull_make_path(const char url, const char etag, const char image_root, const char prefix, const char suffix, char *ret) {
9818005d	161	_cleanup_free_ char escaped_url = NULL, escaped_etag = NULL;
56ebfaf1 LP	162	char *path;
	163
	164	assert(url);
	165	assert(ret);
	166
	167	if (!image_root)
	168	image_root = "/var/lib/machines";
	169
	170	escaped_url = xescape(url, FILENAME_ESCAPE);
	171	if (!escaped_url)
	172	return -ENOMEM;
	173
	174	if (etag) {
56ebfaf1 LP	175	escaped_etag = xescape(etag, FILENAME_ESCAPE);
	176	if (!escaped_etag)
	177	return -ENOMEM;
9818005d	178	}
56ebfaf1	179
9818005d	180	path = strjoin(image_root, "/", strempty(prefix), escaped_url, escaped_etag ? "." : "",
4600a396	181	strempty(escaped_etag), strempty(suffix));
56ebfaf1 LP	182	if (!path)
	183	return -ENOMEM;
	184
9818005d JS	185	/* URLs might make the path longer than the maximum allowed length for a file name.
	186	* When that happens, a URL hash is used instead. Paths returned by this function
	187	* can be later used with tempfn_random() which adds 16 bytes to the resulting name. */
	188	if (strlen(path) >= HASH_URL_THRESHOLD_LENGTH) {
	189	_cleanup_free_ char *hash = NULL;
	190	int r;
	191
	192	free(path);
	193
	194	r = hash_url(url, &hash);
	195	if (r < 0)
	196	return r;
	197
	198	path = strjoin(image_root, "/", strempty(prefix), hash, escaped_etag ? "." : "",
4600a396	199	strempty(escaped_etag), strempty(suffix));
9818005d JS	200	if (!path)
	201	return -ENOMEM;
	202	}
	203
56ebfaf1 LP	204	*ret = path;
	205	return 0;
	206	}
85dbc41d	207
91359193	208	int pull_make_auxiliary_job(
9854730b LP	209	PullJob **ret,
9854730b LP	210	const char *url,
91359193 LP	211	int (strip_suffixes)(const char name, char **ret),
91359193 LP	212	const char *suffix,
9854730b LP	213	CurlGlue *glue,
	214	PullJobFinished on_finished,
	215	void *userdata) {
	216
91359193	217	_cleanup_free_ char last_component = NULL, ll = NULL, *auxiliary_url = NULL;
9854730b LP	218	_cleanup_(pull_job_unrefp) PullJob *job = NULL;
	219	const char *q;
	220	int r;
	221
	222	assert(ret);
	223	assert(url);
91359193	224	assert(strip_suffixes);
9854730b LP	225	assert(glue);
	226
	227	r = import_url_last_component(url, &last_component);
	228	if (r < 0)
	229	return r;
	230
91359193	231	r = strip_suffixes(last_component, &ll);
9854730b LP	232	if (r < 0)
	233	return r;
	234
91359193	235	q = strjoina(ll, suffix);
9854730b	236
91359193	237	r = import_url_change_last_component(url, q, &auxiliary_url);
9854730b LP	238	if (r < 0)
	239	return r;
	240
91359193	241	r = pull_job_new(&job, auxiliary_url, glue, userdata);
9854730b LP	242	if (r < 0)
	243	return r;
	244
	245	job->on_finished = on_finished;
	246	job->compressed_max = job->uncompressed_max = 1ULL * 1024ULL * 1024ULL;
	247
1cc6c93a	248	*ret = TAKE_PTR(job);
9854730b LP	249
	250	return 0;
	251	}
	252
dc2c282b LP	253	int pull_make_verification_jobs(
	254	PullJob **ret_checksum_job,
	255	PullJob **ret_signature_job,
98c38001 LP	256	ImportVerify verify,
	257	const char *url,
	258	CurlGlue *glue,
dc2c282b	259	PullJobFinished on_finished,
98c38001 LP	260	void *userdata) {
98c38001 LP	261
dc2c282b	262	_cleanup_(pull_job_unrefp) PullJob checksum_job = NULL, signature_job = NULL;
98c38001	263	int r;
697be0be	264	const char *chksums = NULL;
98c38001 LP	265
	266	assert(ret_checksum_job);
	267	assert(ret_signature_job);
	268	assert(verify >= 0);
	269	assert(verify < _IMPORT_VERIFY_MAX);
	270	assert(url);
	271	assert(glue);
	272
	273	if (verify != IMPORT_VERIFY_NO) {
697be0be	274	_cleanup_free_ char checksum_url = NULL, fn = NULL;
98c38001	275
697be0be TB	276	/* Queue jobs for the checksum file for the image. */
	277	r = import_url_last_component(url, &fn);
	278	if (r < 0)
	279	return r;
	280
	281	chksums = strjoina(fn, ".sha256");
	282
	283	r = import_url_change_last_component(url, chksums, &checksum_url);
98c38001 LP	284	if (r < 0)
	285	return r;
	286
dc2c282b	287	r = pull_job_new(&checksum_job, checksum_url, glue, userdata);
98c38001 LP	288	if (r < 0)
	289	return r;
	290
	291	checksum_job->on_finished = on_finished;
	292	checksum_job->uncompressed_max = checksum_job->compressed_max = 1ULL * 1024ULL * 1024ULL;
	293	}
	294
	295	if (verify == IMPORT_VERIFY_SIGNATURE) {
	296	_cleanup_free_ char *signature_url = NULL;
	297
	298	/* Queue job for the SHA256SUMS.gpg file for the image. */
	299	r = import_url_change_last_component(url, "SHA256SUMS.gpg", &signature_url);
	300	if (r < 0)
	301	return r;
	302
dc2c282b	303	r = pull_job_new(&signature_job, signature_url, glue, userdata);
98c38001 LP	304	if (r < 0)
	305	return r;
	306
	307	signature_job->on_finished = on_finished;
	308	signature_job->uncompressed_max = signature_job->compressed_max = 1ULL * 1024ULL * 1024ULL;
	309	}
	310
	311	*ret_checksum_job = checksum_job;
	312	*ret_signature_job = signature_job;
	313
	314	checksum_job = signature_job = NULL;
	315
	316	return 0;
	317	}
	318
91359193	319	static int verify_one(PullJob checksum_job, PullJob job) {
98c38001	320	_cleanup_free_ char *fn = NULL;
91359193	321	const char line, p;
98c38001 LP	322	int r;
98c38001 LP	323
91359193	324	assert(checksum_job);
98c38001	325
91359193	326	if (!job)
98c38001 LP	327	return 0;
98c38001 LP	328
91359193	329	assert(IN_SET(job->state, PULL_JOB_DONE, PULL_JOB_FAILED));
98c38001	330
91359193 LP	331	/* Don't verify the checksum if we didn't actually successfully download something new */
	332	if (job->state != PULL_JOB_DONE)
	333	return 0;
	334	if (job->error != 0)
	335	return 0;
	336	if (job->etag_exists)
	337	return 0;
98c38001	338
91359193 LP	339	assert(job->calc_checksum);
	340	assert(job->checksum);
	341
	342	r = import_url_last_component(job->url, &fn);
98c38001 LP	343	if (r < 0)
	344	return log_oom();
	345
	346	if (!filename_is_valid(fn)) {
91359193	347	log_error("Cannot verify checksum, could not determine server-side file name.");
98c38001 LP	348	return -EBADMSG;
	349	}
	350
91359193	351	line = strjoina(job->checksum, " *", fn, "\n");
98c38001 LP	352
	353	p = memmem(checksum_job->payload,
	354	checksum_job->payload_size,
	355	line,
	356	strlen(line));
	357
697be0be TB	358	if (!p) {
	359	line = strjoina(job->checksum, " ", fn, "\n");
	360
	361	p = memmem(checksum_job->payload,
	362	checksum_job->payload_size,
	363	line,
	364	strlen(line));
	365	}
	366
98c38001	367	if (!p \|\| (p != (char*) checksum_job->payload && p[-1] != '\n')) {
91359193	368	log_error("DOWNLOAD INVALID: Checksum of %s file did not checkout, file has been tampered with.", fn);
98c38001 LP	369	return -EBADMSG;
	370	}
	371
91359193 LP	372	log_info("SHA256 checksum of %s is valid.", job->url);
	373	return 1;
	374	}
98c38001	375
91359193 LP	376	int pull_verify(PullJob *main_job,
	377	PullJob *roothash_job,
	378	PullJob *settings_job,
	379	PullJob *checksum_job,
	380	PullJob *signature_job) {
9854730b	381
91359193	382	_cleanup_close_pair_ int gpg_pipe[2] = { -1, -1 };
91359193 LP	383	_cleanup_close_ int sig_file = -1;
	384	char sig_file_path[] = "/tmp/sigXXXXXX", gpg_home[] = "/tmp/gpghomeXXXXXX";
	385	_cleanup_(sigkill_waitp) pid_t pid = 0;
	386	bool gpg_home_created = false;
	387	int r;
9854730b	388
91359193 LP	389	assert(main_job);
91359193 LP	390	assert(main_job->state == PULL_JOB_DONE);
9854730b	391
91359193 LP	392	if (!checksum_job)
91359193 LP	393	return 0;
9854730b	394
91359193 LP	395	assert(main_job->calc_checksum);
91359193 LP	396	assert(main_job->checksum);
9854730b	397
91359193	398	assert(checksum_job->state == PULL_JOB_DONE);
9854730b	399
91359193 LP	400	if (!checksum_job->payload \|\| checksum_job->payload_size <= 0) {
	401	log_error("Checksum is empty, cannot verify.");
	402	return -EBADMSG;
	403	}
9854730b	404
91359193 LP	405	r = verify_one(checksum_job, main_job);
	406	if (r < 0)
	407	return r;
9854730b	408
91359193 LP	409	r = verify_one(checksum_job, roothash_job);
	410	if (r < 0)
	411	return r;
9854730b	412
91359193 LP	413	r = verify_one(checksum_job, settings_job);
	414	if (r < 0)
	415	return r;
9854730b	416
98c38001 LP	417	if (!signature_job)
	418	return 0;
	419
697be0be TB	420	if (checksum_job->style == VERIFICATION_PER_FILE)
	421	signature_job = checksum_job;
	422
dc2c282b	423	assert(signature_job->state == PULL_JOB_DONE);
98c38001 LP	424
	425	if (!signature_job->payload \|\| signature_job->payload_size <= 0) {
	426	log_error("Signature is empty, cannot verify.");
	427	return -EBADMSG;
	428	}
	429
	430	r = pipe2(gpg_pipe, O_CLOEXEC);
	431	if (r < 0)
0100b6e1	432	return log_error_errno(errno, "Failed to create pipe for gpg: %m");
98c38001 LP	433
	434	sig_file = mkostemp(sig_file_path, O_RDWR);
	435	if (sig_file < 0)
	436	return log_error_errno(errno, "Failed to create temporary file: %m");
	437
	438	r = loop_write(sig_file, signature_job->payload, signature_job->payload_size, false);
	439	if (r < 0) {
	440	log_error_errno(r, "Failed to write to temporary file: %m");
	441	goto finish;
	442	}
	443
0acfdffe LP	444	if (!mkdtemp(gpg_home)) {
	445	r = log_error_errno(errno, "Failed to create tempory home for gpg: %m");
	446	goto finish;
	447	}
	448
	449	gpg_home_created = true;
	450
b6e1fff1	451	r = safe_fork("(gpg)", FORK_RESET_SIGNALS\|FORK_DEATHSIG\|FORK_LOG, &pid);
4c253ed1	452	if (r < 0)
b6e1fff1	453	return r;
4c253ed1	454	if (r == 0) {
98c38001 LP	455	const char *cmd[] = {
	456	"gpg",
	457	"--no-options",
	458	"--no-default-keyring",
	459	"--no-auto-key-locate",
	460	"--no-auto-check-trustdb",
	461	"--batch",
	462	"--trust-model=always",
0acfdffe LP	463	NULL, /* --homedir= */
0acfdffe LP	464	NULL, /* --keyring= */
98c38001 LP	465	NULL, /* --verify */
	466	NULL, /* signature file */
	467	NULL, /* dash */
	468	NULL /* trailing NULL */
	469	};
0acfdffe	470	unsigned k = ELEMENTSOF(cmd) - 6;
98c38001 LP	471
	472	/* Child */
	473
98c38001 LP	474	gpg_pipe[1] = safe_close(gpg_pipe[1]);
98c38001 LP	475
2b33ab09	476	r = rearrange_stdio(gpg_pipe[0], -1, STDERR_FILENO);
046a82c1	477	if (r < 0) {
2b33ab09	478	log_error_errno(r, "Failed to rearrange stdin/stdout: %m");
98c38001 LP	479	_exit(EXIT_FAILURE);
	480	}
	481
0acfdffe LP	482	cmd[k++] = strjoina("--homedir=", gpg_home);
0acfdffe LP	483
98c38001 LP	484	/* We add the user keyring only to the command line
	485	* arguments, if it's around since gpg fails
	486	* otherwise. */
	487	if (access(USER_KEYRING_PATH, F_OK) >= 0)
	488	cmd[k++] = "--keyring=" USER_KEYRING_PATH;
1c49d1ba LP	489	else
1c49d1ba LP	490	cmd[k++] = "--keyring=" VENDOR_KEYRING_PATH;
98c38001 LP	491
98c38001 LP	492	cmd[k++] = "--verify";
697be0be TB	493	if (checksum_job->style == VERIFICATION_PER_DIRECTORY) {
	494	cmd[k++] = sig_file_path;
	495	cmd[k++] = "-";
	496	cmd[k++] = NULL;
	497	}
98c38001	498
0acfdffe	499	execvp("gpg2", (char * const *) cmd);
98c38001 LP	500	execvp("gpg", (char * const *) cmd);
	501	log_error_errno(errno, "Failed to execute gpg: %m");
	502	_exit(EXIT_FAILURE);
	503	}
	504
	505	gpg_pipe[0] = safe_close(gpg_pipe[0]);
	506
	507	r = loop_write(gpg_pipe[1], checksum_job->payload, checksum_job->payload_size, false);
	508	if (r < 0) {
	509	log_error_errno(r, "Failed to write to pipe: %m");
	510	goto finish;
	511	}
	512
	513	gpg_pipe[1] = safe_close(gpg_pipe[1]);
	514
7d4904fe	515	r = wait_for_terminate_and_check("gpg", pid, WAIT_LOG_ABNORMAL);
98c38001 LP	516	pid = 0;
	517	if (r < 0)
	518	goto finish;
b4a34311	519	if (r != EXIT_SUCCESS) {
9854730b	520	log_error("DOWNLOAD INVALID: Signature verification failed.");
98c38001 LP	521	r = -EBADMSG;
	522	} else {
	523	log_info("Signature verification succeeded.");
	524	r = 0;
	525	}
	526
	527	finish:
	528	if (sig_file >= 0)
9854730b	529	(void) unlink(sig_file_path);
98c38001	530
0acfdffe	531	if (gpg_home_created)
c6878637	532	(void) rm_rf(gpg_home, REMOVE_ROOT\|REMOVE_PHYSICAL);
0acfdffe	533
98c38001 LP	534	return r;
98c38001 LP	535	}