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

/***
  This file is part of systemd.

  Copyright 2015 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <sys/prctl.h>

#include "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 = l;
        l = NULL;

        return 0;
}

int pull_make_local_copy(const char *final, const char *image_root, const char *local, bool force_local) {
        const char *p;
        int r;

        assert(final);
        assert(local);

        if (!image_root)
                image_root = "/var/lib/machines";

        p = strjoina(image_root, "/", local);

        if (force_local)
                (void) rm_rf(p, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);

        r = btrfs_subvol_snapshot(final, p, BTRFS_SNAPSHOT_QUOTA);
        if (r == -ENOTTY) {
                r = copy_tree(final, p, false);
                if (r < 0)
                        return log_error_errno(r, "Failed to copy image: %m");
        } else if (r < 0)
                return log_error_errno(r, "Failed to create local image: %m");

        log_info("Created new local image '%s'.", local);

        return 0;
}

static int hash_url(const char *url, char **ret) {
        uint64_t h;
        static const sd_id128_t k = SD_ID128_ARRAY(df,89,16,87,01,cc,42,30,98,ab,4a,19,a6,a5,63,4f);

        assert(url);

        h = siphash24(url, strlen(url), k.bytes);
        if (asprintf(ret, "%"PRIx64, h) < 0)
                return -ENOMEM;

        return 0;
}

int pull_make_path(const char *url, const char *etag, const char *image_root, const char *prefix, const char *suffix, char **ret) {
        _cleanup_free_ char *escaped_url = NULL, *escaped_etag = NULL;
        char *path;

        assert(url);
        assert(ret);

        if (!image_root)
                image_root = "/var/lib/machines";

        escaped_url = xescape(url, FILENAME_ESCAPE);
        if (!escaped_url)
                return -ENOMEM;

        if (etag) {
                escaped_etag = xescape(etag, FILENAME_ESCAPE);
                if (!escaped_etag)
                        return -ENOMEM;
        }

        path = strjoin(image_root, "/", strempty(prefix), escaped_url, escaped_etag ? "." : "",
                       strempty(escaped_etag), strempty(suffix), NULL);
        if (!path)
                return -ENOMEM;

        /* URLs might make the path longer than the maximum allowed length for a file name.
         * When that happens, a URL hash is used instead. Paths returned by this function
         * can be later used with tempfn_random() which adds 16 bytes to the resulting name. */
        if (strlen(path) >= HASH_URL_THRESHOLD_LENGTH) {
                _cleanup_free_ char *hash = NULL;
                int r;

                free(path);

                r = hash_url(url, &hash);
                if (r < 0)
                        return r;

                path = strjoin(image_root, "/", strempty(prefix), hash, escaped_etag ? "." : "",
                               strempty(escaped_etag), strempty(suffix), NULL);
                if (!path)
                        return -ENOMEM;
        }

        *ret = path;
        return 0;
}

int pull_make_settings_job(
                PullJob **ret,
                const char *url,
                CurlGlue *glue,
                PullJobFinished on_finished,
                void *userdata) {

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

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

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

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

        q = strjoina(ll, ".nspawn");

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

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

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

        *ret = job;
        job = NULL;

        return 0;
}

int pull_make_verification_jobs(
                PullJob **ret_checksum_job,
                PullJob **ret_signature_job,
                ImportVerify verify,
                const char *url,
                CurlGlue *glue,
                PullJobFinished on_finished,
                void *userdata) {

        _cleanup_(pull_job_unrefp) PullJob *checksum_job = NULL, *signature_job = NULL;
        int r;

        assert(ret_checksum_job);
        assert(ret_signature_job);
        assert(verify >= 0);
        assert(verify < _IMPORT_VERIFY_MAX);
        assert(url);
        assert(glue);

        if (verify != IMPORT_VERIFY_NO) {
                _cleanup_free_ char *checksum_url = NULL;

                /* Queue job for the SHA256SUMS file for the image */
                r = import_url_change_last_component(url, "SHA256SUMS", &checksum_url);
                if (r < 0)
                        return r;

                r = pull_job_new(&checksum_job, checksum_url, glue, userdata);
                if (r < 0)
                        return r;

                checksum_job->on_finished = on_finished;
                checksum_job->uncompressed_max = checksum_job->compressed_max = 1ULL * 1024ULL * 1024ULL;
        }

        if (verify == IMPORT_VERIFY_SIGNATURE) {
                _cleanup_free_ char *signature_url = NULL;

                /* Queue job for the SHA256SUMS.gpg file for the image. */
                r = import_url_change_last_component(url, "SHA256SUMS.gpg", &signature_url);
                if (r < 0)
                        return r;

                r = pull_job_new(&signature_job, signature_url, glue, userdata);
                if (r < 0)
                        return r;

                signature_job->on_finished = on_finished;
                signature_job->uncompressed_max = signature_job->compressed_max = 1ULL * 1024ULL * 1024ULL;
        }

        *ret_checksum_job = checksum_job;
        *ret_signature_job = signature_job;

        checksum_job = signature_job = NULL;

        return 0;
}

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

        _cleanup_close_pair_ int gpg_pipe[2] = { -1, -1 };
        _cleanup_free_ char *fn = NULL;
        _cleanup_close_ int sig_file = -1;
        const char *p, *line;
        char sig_file_path[] = "/tmp/sigXXXXXX", gpg_home[] = "/tmp/gpghomeXXXXXX";
        _cleanup_sigkill_wait_ pid_t pid = 0;
        bool gpg_home_created = false;
        int r;

        assert(main_job);
        assert(main_job->state == PULL_JOB_DONE);

        if (!checksum_job)
                return 0;

        assert(main_job->calc_checksum);
        assert(main_job->checksum);
        assert(checksum_job->state == PULL_JOB_DONE);

        if (!checksum_job->payload || checksum_job->payload_size <= 0) {
                log_error("Checksum is empty, cannot verify.");
                return -EBADMSG;
        }

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

        if (!filename_is_valid(fn)) {
                log_error("Cannot verify checksum, could not determine valid server-side file name.");
                return -EBADMSG;
        }

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

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

        if (!p || (p != (char*) checksum_job->payload && p[-1] != '\n')) {
                log_error("DOWNLOAD INVALID: Checksum did not check out, payload has been tampered with.");
                return -EBADMSG;
        }

        log_info("SHA256 checksum of %s is valid.", main_job->url);

        assert(!settings_job || IN_SET(settings_job->state, PULL_JOB_DONE, PULL_JOB_FAILED));

        if (settings_job &&
            settings_job->state == PULL_JOB_DONE &&
            settings_job->error == 0 &&
            !settings_job->etag_exists) {

                _cleanup_free_ char *settings_fn = NULL;

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

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

                if (!filename_is_valid(settings_fn)) {
                        log_error("Cannot verify checksum, could not determine server-side settings file name.");
                        return -EBADMSG;
                }

                line = strjoina(settings_job->checksum, " *", settings_fn, "\n");

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

                if (!p || (p != (char*) checksum_job->payload && p[-1] != '\n')) {
                        log_error("DOWNLOAD INVALID: Checksum of settings file did not checkout, settings file has been tampered with.");
                        return -EBADMSG;
                }

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

        if (!signature_job)
                return 0;

        assert(signature_job->state == PULL_JOB_DONE);

        if (!signature_job->payload || signature_job->payload_size <= 0) {
                log_error("Signature is empty, cannot verify.");
                return -EBADMSG;
        }

        r = pipe2(gpg_pipe, O_CLOEXEC);
        if (r < 0)
                return log_error_errno(errno, "Failed to create pipe for gpg: %m");

        sig_file = mkostemp(sig_file_path, O_RDWR);
        if (sig_file < 0)
                return log_error_errno(errno, "Failed to create temporary file: %m");

        r = loop_write(sig_file, signature_job->payload, signature_job->payload_size, false);
        if (r < 0) {
                log_error_errno(r, "Failed to write to temporary file: %m");
                goto finish;
        }

        if (!mkdtemp(gpg_home)) {
                r = log_error_errno(errno, "Failed to create tempory home for gpg: %m");
                goto finish;
        }

        gpg_home_created = true;

        pid = fork();
        if (pid < 0)
                return log_error_errno(errno, "Failed to fork off gpg: %m");
        if (pid == 0) {
                const char *cmd[] = {
                        "gpg",
                        "--no-options",
                        "--no-default-keyring",
                        "--no-auto-key-locate",
                        "--no-auto-check-trustdb",
                        "--batch",
                        "--trust-model=always",
                        NULL, /* --homedir=  */
                        NULL, /* --keyring= */
                        NULL, /* --verify */
                        NULL, /* signature file */
                        NULL, /* dash */
                        NULL  /* trailing NULL */
                };
                unsigned k = ELEMENTSOF(cmd) - 6;
                int null_fd;

                /* Child */

                (void) reset_all_signal_handlers();
                (void) reset_signal_mask();
                assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);

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

                if (dup2(gpg_pipe[0], STDIN_FILENO) != STDIN_FILENO) {
                        log_error_errno(errno, "Failed to dup2() fd: %m");
                        _exit(EXIT_FAILURE);
                }

                if (gpg_pipe[0] != STDIN_FILENO)
                        gpg_pipe[0] = safe_close(gpg_pipe[0]);

                null_fd = open("/dev/null", O_WRONLY|O_NOCTTY);
                if (null_fd < 0) {
                        log_error_errno(errno, "Failed to open /dev/null: %m");
                        _exit(EXIT_FAILURE);
                }

                if (dup2(null_fd, STDOUT_FILENO) != STDOUT_FILENO) {
                        log_error_errno(errno, "Failed to dup2() fd: %m");
                        _exit(EXIT_FAILURE);
                }

                if (null_fd != STDOUT_FILENO)
                        null_fd = safe_close(null_fd);

                cmd[k++] = strjoina("--homedir=", gpg_home);

                /* We add the user keyring only to the command line
                 * arguments, if it's around since gpg fails
                 * otherwise. */
                if (access(USER_KEYRING_PATH, F_OK) >= 0)
                        cmd[k++] = "--keyring=" USER_KEYRING_PATH;
                else
                        cmd[k++] = "--keyring=" VENDOR_KEYRING_PATH;

                cmd[k++] = "--verify";
                cmd[k++] = sig_file_path;
                cmd[k++] = "-";
                cmd[k++] = NULL;

                fd_cloexec(STDIN_FILENO, false);
                fd_cloexec(STDOUT_FILENO, false);
                fd_cloexec(STDERR_FILENO, false);

                execvp("gpg2", (char * const *) cmd);
                execvp("gpg", (char * const *) cmd);
                log_error_errno(errno, "Failed to execute gpg: %m");
                _exit(EXIT_FAILURE);
        }

        gpg_pipe[0] = safe_close(gpg_pipe[0]);

        r = loop_write(gpg_pipe[1], checksum_job->payload, checksum_job->payload_size, false);
        if (r < 0) {
                log_error_errno(r, "Failed to write to pipe: %m");
                goto finish;
        }

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

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

finish:
        if (sig_file >= 0)
                (void) unlink(sig_file_path);

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

        return r;
}
Commit	Line	Data
56ebfaf1 LP	1	/***
	2	This file is part of systemd.
	3
	4	Copyright 2015 Lennart Poettering
	5
	6	systemd is free software; you can redistribute it and/or modify it
	7	under the terms of the GNU Lesser General Public License as published by
	8	the Free Software Foundation; either version 2.1 of the License, or
	9	(at your option) any later version.
	10
	11	systemd is distributed in the hope that it will be useful, but
	12	WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	Lesser General Public License for more details.
	15
	16	You should have received a copy of the GNU Lesser General Public License
	17	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	18	***/
	19
98c38001 LP	20	#include <sys/prctl.h>
98c38001 LP	21
b5efdb8a	22	#include "alloc-util.h"
56ebfaf1	23	#include "btrfs-util.h"
430f0182	24	#include "capability-util.h"
4f5dd394	25	#include "copy.h"
a0956174	26	#include "dirent-util.h"
4f5dd394	27	#include "escape.h"
3ffd4af2	28	#include "fd-util.h"
c004493c	29	#include "io-util.h"
bb15fafe	30	#include "path-util.h"
0b452006	31	#include "process-util.h"
3ffd4af2	32	#include "pull-common.h"
4f5dd394 LP	33	#include "pull-job.h"
4f5dd394 LP	34	#include "rm-rf.h"
24882e06	35	#include "signal-util.h"
9818005d	36	#include "siphash24.h"
07630cea	37	#include "string-util.h"
4f5dd394 LP	38	#include "strv.h"
4f5dd394 LP	39	#include "util.h"
49cf4170	40	#include "web-util.h"
56ebfaf1 LP	41
56ebfaf1 LP	42	#define FILENAME_ESCAPE "/.#\"\'"
9818005d	43	#define HASH_URL_THRESHOLD_LENGTH (_POSIX_PATH_MAX - 16)
56ebfaf1	44
9854730b LP	45	int pull_find_old_etags(
	46	const char *url,
	47	const char *image_root,
	48	int dt,
	49	const char *prefix,
	50	const char *suffix,
	51	char ***etags) {
	52
56ebfaf1 LP	53	_cleanup_free_ char *escaped_url = NULL;
	54	_cleanup_closedir_ DIR *d = NULL;
	55	_cleanup_strv_free_ char **l = NULL;
	56	struct dirent *de;
	57	int r;
	58
	59	assert(url);
	60	assert(etags);
	61
	62	if (!image_root)
	63	image_root = "/var/lib/machines";
	64
	65	escaped_url = xescape(url, FILENAME_ESCAPE);
	66	if (!escaped_url)
	67	return -ENOMEM;
	68
	69	d = opendir(image_root);
	70	if (!d) {
	71	if (errno == ENOENT) {
	72	*etags = NULL;
	73	return 0;
	74	}
	75
	76	return -errno;
	77	}
	78
	79	FOREACH_DIRENT_ALL(de, d, return -errno) {
	80	const char a, b;
	81	char *u;
	82
	83	if (de->d_type != DT_UNKNOWN &&
	84	de->d_type != dt)
	85	continue;
	86
	87	if (prefix) {
	88	a = startswith(de->d_name, prefix);
	89	if (!a)
	90	continue;
	91	} else
	92	a = de->d_name;
	93
	94	a = startswith(a, escaped_url);
	95	if (!a)
	96	continue;
	97
	98	a = startswith(a, ".");
	99	if (!a)
	100	continue;
	101
	102	if (suffix) {
	103	b = endswith(de->d_name, suffix);
	104	if (!b)
	105	continue;
	106	} else
	107	b = strchr(de->d_name, 0);
	108
	109	if (a >= b)
	110	continue;
	111
527b7a42 LP	112	r = cunescape_length(a, b - a, 0, &u);
	113	if (r < 0)
	114	return r;
56ebfaf1 LP	115
	116	if (!http_etag_is_valid(u)) {
	117	free(u);
	118	continue;
	119	}
	120
	121	r = strv_consume(&l, u);
	122	if (r < 0)
	123	return r;
	124	}
	125
	126	*etags = l;
	127	l = NULL;
	128
	129	return 0;
	130	}
	131
dc2c282b	132	int pull_make_local_copy(const char final, const char image_root, const char *local, bool force_local) {
56ebfaf1 LP	133	const char *p;
	134	int r;
	135
	136	assert(final);
	137	assert(local);
	138
	139	if (!image_root)
	140	image_root = "/var/lib/machines";
	141
63c372cb	142	p = strjoina(image_root, "/", local);
56ebfaf1	143
d9e2daaf LP	144	if (force_local)
d9e2daaf LP	145	(void) rm_rf(p, REMOVE_ROOT\|REMOVE_PHYSICAL\|REMOVE_SUBVOLUME);
56ebfaf1	146
5bcd08db	147	r = btrfs_subvol_snapshot(final, p, BTRFS_SNAPSHOT_QUOTA);
56ebfaf1 LP	148	if (r == -ENOTTY) {
	149	r = copy_tree(final, p, false);
	150	if (r < 0)
	151	return log_error_errno(r, "Failed to copy image: %m");
	152	} else if (r < 0)
	153	return log_error_errno(r, "Failed to create local image: %m");
	154
	155	log_info("Created new local image '%s'.", local);
	156
	157	return 0;
	158	}
	159
9818005d JS	160	static int hash_url(const char url, char *ret) {
	161	uint64_t h;
	162	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);
	163
	164	assert(url);
	165
933f9cae	166	h = siphash24(url, strlen(url), k.bytes);
9818005d JS	167	if (asprintf(ret, "%"PRIx64, h) < 0)
	168	return -ENOMEM;
	169
	170	return 0;
	171	}
	172
dc2c282b	173	int pull_make_path(const char url, const char etag, const char image_root, const char prefix, const char suffix, char *ret) {
9818005d	174	_cleanup_free_ char escaped_url = NULL, escaped_etag = NULL;
56ebfaf1 LP	175	char *path;
	176
	177	assert(url);
	178	assert(ret);
	179
	180	if (!image_root)
	181	image_root = "/var/lib/machines";
	182
	183	escaped_url = xescape(url, FILENAME_ESCAPE);
	184	if (!escaped_url)
	185	return -ENOMEM;
	186
	187	if (etag) {
56ebfaf1 LP	188	escaped_etag = xescape(etag, FILENAME_ESCAPE);
	189	if (!escaped_etag)
	190	return -ENOMEM;
9818005d	191	}
56ebfaf1	192
9818005d JS	193	path = strjoin(image_root, "/", strempty(prefix), escaped_url, escaped_etag ? "." : "",
9818005d JS	194	strempty(escaped_etag), strempty(suffix), NULL);
56ebfaf1 LP	195	if (!path)
	196	return -ENOMEM;
	197
9818005d JS	198	/* URLs might make the path longer than the maximum allowed length for a file name.
	199	* When that happens, a URL hash is used instead. Paths returned by this function
	200	* can be later used with tempfn_random() which adds 16 bytes to the resulting name. */
	201	if (strlen(path) >= HASH_URL_THRESHOLD_LENGTH) {
	202	_cleanup_free_ char *hash = NULL;
	203	int r;
	204
	205	free(path);
	206
	207	r = hash_url(url, &hash);
	208	if (r < 0)
	209	return r;
	210
	211	path = strjoin(image_root, "/", strempty(prefix), hash, escaped_etag ? "." : "",
	212	strempty(escaped_etag), strempty(suffix), NULL);
	213	if (!path)
	214	return -ENOMEM;
	215	}
	216
56ebfaf1 LP	217	*ret = path;
	218	return 0;
	219	}
85dbc41d	220
9854730b LP	221	int pull_make_settings_job(
	222	PullJob **ret,
	223	const char *url,
	224	CurlGlue *glue,
	225	PullJobFinished on_finished,
	226	void *userdata) {
	227
	228	_cleanup_free_ char last_component = NULL, ll = NULL, *settings_url = NULL;
	229	_cleanup_(pull_job_unrefp) PullJob *job = NULL;
	230	const char *q;
	231	int r;
	232
	233	assert(ret);
	234	assert(url);
	235	assert(glue);
	236
	237	r = import_url_last_component(url, &last_component);
	238	if (r < 0)
	239	return r;
	240
	241	r = tar_strip_suffixes(last_component, &ll);
	242	if (r < 0)
	243	return r;
	244
	245	q = strjoina(ll, ".nspawn");
	246
	247	r = import_url_change_last_component(url, q, &settings_url);
	248	if (r < 0)
	249	return r;
	250
	251	r = pull_job_new(&job, settings_url, glue, userdata);
	252	if (r < 0)
	253	return r;
	254
	255	job->on_finished = on_finished;
	256	job->compressed_max = job->uncompressed_max = 1ULL * 1024ULL * 1024ULL;
	257
	258	*ret = job;
	259	job = NULL;
	260
	261	return 0;
	262	}
	263
dc2c282b LP	264	int pull_make_verification_jobs(
	265	PullJob **ret_checksum_job,
	266	PullJob **ret_signature_job,
98c38001 LP	267	ImportVerify verify,
	268	const char *url,
	269	CurlGlue *glue,
dc2c282b	270	PullJobFinished on_finished,
98c38001 LP	271	void *userdata) {
98c38001 LP	272
dc2c282b	273	_cleanup_(pull_job_unrefp) PullJob checksum_job = NULL, signature_job = NULL;
98c38001 LP	274	int r;
	275
	276	assert(ret_checksum_job);
	277	assert(ret_signature_job);
	278	assert(verify >= 0);
	279	assert(verify < _IMPORT_VERIFY_MAX);
	280	assert(url);
	281	assert(glue);
	282
	283	if (verify != IMPORT_VERIFY_NO) {
	284	_cleanup_free_ char *checksum_url = NULL;
	285
	286	/* Queue job for the SHA256SUMS file for the image */
	287	r = import_url_change_last_component(url, "SHA256SUMS", &checksum_url);
	288	if (r < 0)
	289	return r;
	290
dc2c282b	291	r = pull_job_new(&checksum_job, checksum_url, glue, userdata);
98c38001 LP	292	if (r < 0)
	293	return r;
	294
	295	checksum_job->on_finished = on_finished;
	296	checksum_job->uncompressed_max = checksum_job->compressed_max = 1ULL * 1024ULL * 1024ULL;
	297	}
	298
	299	if (verify == IMPORT_VERIFY_SIGNATURE) {
	300	_cleanup_free_ char *signature_url = NULL;
	301
	302	/* Queue job for the SHA256SUMS.gpg file for the image. */
	303	r = import_url_change_last_component(url, "SHA256SUMS.gpg", &signature_url);
	304	if (r < 0)
	305	return r;
	306
dc2c282b	307	r = pull_job_new(&signature_job, signature_url, glue, userdata);
98c38001 LP	308	if (r < 0)
	309	return r;
	310
	311	signature_job->on_finished = on_finished;
	312	signature_job->uncompressed_max = signature_job->compressed_max = 1ULL * 1024ULL * 1024ULL;
	313	}
	314
	315	*ret_checksum_job = checksum_job;
	316	*ret_signature_job = signature_job;
	317
	318	checksum_job = signature_job = NULL;
	319
	320	return 0;
	321	}
	322
9854730b LP	323	int pull_verify(PullJob *main_job,
9854730b LP	324	PullJob *settings_job,
dc2c282b LP	325	PullJob *checksum_job,
dc2c282b LP	326	PullJob *signature_job) {
98c38001 LP	327
	328	_cleanup_close_pair_ int gpg_pipe[2] = { -1, -1 };
	329	_cleanup_free_ char *fn = NULL;
	330	_cleanup_close_ int sig_file = -1;
	331	const char p, line;
0acfdffe	332	char sig_file_path[] = "/tmp/sigXXXXXX", gpg_home[] = "/tmp/gpghomeXXXXXX";
98c38001	333	_cleanup_sigkill_wait_ pid_t pid = 0;
0acfdffe	334	bool gpg_home_created = false;
98c38001 LP	335	int r;
	336
	337	assert(main_job);
dc2c282b	338	assert(main_job->state == PULL_JOB_DONE);
98c38001 LP	339
	340	if (!checksum_job)
	341	return 0;
	342
	343	assert(main_job->calc_checksum);
	344	assert(main_job->checksum);
dc2c282b	345	assert(checksum_job->state == PULL_JOB_DONE);
98c38001 LP	346
	347	if (!checksum_job->payload \|\| checksum_job->payload_size <= 0) {
	348	log_error("Checksum is empty, cannot verify.");
	349	return -EBADMSG;
	350	}
	351
	352	r = import_url_last_component(main_job->url, &fn);
	353	if (r < 0)
	354	return log_oom();
	355
	356	if (!filename_is_valid(fn)) {
	357	log_error("Cannot verify checksum, could not determine valid server-side file name.");
	358	return -EBADMSG;
	359	}
	360
63c372cb	361	line = strjoina(main_job->checksum, " *", fn, "\n");
98c38001 LP	362
	363	p = memmem(checksum_job->payload,
	364	checksum_job->payload_size,
	365	line,
	366	strlen(line));
	367
	368	if (!p \|\| (p != (char*) checksum_job->payload && p[-1] != '\n')) {
9c00a6ad	369	log_error("DOWNLOAD INVALID: Checksum did not check out, payload has been tampered with.");
98c38001 LP	370	return -EBADMSG;
	371	}
	372
	373	log_info("SHA256 checksum of %s is valid.", main_job->url);
	374
1f9aa80a	375	assert(!settings_job \|\| IN_SET(settings_job->state, PULL_JOB_DONE, PULL_JOB_FAILED));
9854730b LP	376
9854730b LP	377	if (settings_job &&
1f9aa80a	378	settings_job->state == PULL_JOB_DONE &&
9854730b LP	379	settings_job->error == 0 &&
	380	!settings_job->etag_exists) {
	381
	382	_cleanup_free_ char *settings_fn = NULL;
	383
	384	assert(settings_job->calc_checksum);
	385	assert(settings_job->checksum);
	386
	387	r = import_url_last_component(settings_job->url, &settings_fn);
	388	if (r < 0)
	389	return log_oom();
	390
	391	if (!filename_is_valid(settings_fn)) {
	392	log_error("Cannot verify checksum, could not determine server-side settings file name.");
	393	return -EBADMSG;
	394	}
	395
	396	line = strjoina(settings_job->checksum, " *", settings_fn, "\n");
	397
	398	p = memmem(checksum_job->payload,
	399	checksum_job->payload_size,
	400	line,
	401	strlen(line));
	402
	403	if (!p \|\| (p != (char*) checksum_job->payload && p[-1] != '\n')) {
9c00a6ad	404	log_error("DOWNLOAD INVALID: Checksum of settings file did not checkout, settings file has been tampered with.");
9854730b LP	405	return -EBADMSG;
	406	}
	407
	408	log_info("SHA256 checksum of %s is valid.", settings_job->url);
	409	}
	410
98c38001 LP	411	if (!signature_job)
	412	return 0;
	413
dc2c282b	414	assert(signature_job->state == PULL_JOB_DONE);
98c38001 LP	415
	416	if (!signature_job->payload \|\| signature_job->payload_size <= 0) {
	417	log_error("Signature is empty, cannot verify.");
	418	return -EBADMSG;
	419	}
	420
	421	r = pipe2(gpg_pipe, O_CLOEXEC);
	422	if (r < 0)
0100b6e1	423	return log_error_errno(errno, "Failed to create pipe for gpg: %m");
98c38001 LP	424
	425	sig_file = mkostemp(sig_file_path, O_RDWR);
	426	if (sig_file < 0)
	427	return log_error_errno(errno, "Failed to create temporary file: %m");
	428
	429	r = loop_write(sig_file, signature_job->payload, signature_job->payload_size, false);
	430	if (r < 0) {
	431	log_error_errno(r, "Failed to write to temporary file: %m");
	432	goto finish;
	433	}
	434
0acfdffe LP	435	if (!mkdtemp(gpg_home)) {
	436	r = log_error_errno(errno, "Failed to create tempory home for gpg: %m");
	437	goto finish;
	438	}
	439
	440	gpg_home_created = true;
	441
98c38001 LP	442	pid = fork();
	443	if (pid < 0)
	444	return log_error_errno(errno, "Failed to fork off gpg: %m");
	445	if (pid == 0) {
	446	const char *cmd[] = {
	447	"gpg",
	448	"--no-options",
	449	"--no-default-keyring",
	450	"--no-auto-key-locate",
	451	"--no-auto-check-trustdb",
	452	"--batch",
	453	"--trust-model=always",
0acfdffe LP	454	NULL, /* --homedir= */
0acfdffe LP	455	NULL, /* --keyring= */
98c38001 LP	456	NULL, /* --verify */
	457	NULL, /* signature file */
	458	NULL, /* dash */
	459	NULL /* trailing NULL */
	460	};
0acfdffe	461	unsigned k = ELEMENTSOF(cmd) - 6;
98c38001 LP	462	int null_fd;
	463
	464	/* Child */
	465
ce30c8dc LP	466	(void) reset_all_signal_handlers();
ce30c8dc LP	467	(void) reset_signal_mask();
98c38001 LP	468	assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
	469
	470	gpg_pipe[1] = safe_close(gpg_pipe[1]);
	471
	472	if (dup2(gpg_pipe[0], STDIN_FILENO) != STDIN_FILENO) {
	473	log_error_errno(errno, "Failed to dup2() fd: %m");
	474	_exit(EXIT_FAILURE);
	475	}
	476
	477	if (gpg_pipe[0] != STDIN_FILENO)
	478	gpg_pipe[0] = safe_close(gpg_pipe[0]);
	479
	480	null_fd = open("/dev/null", O_WRONLY\|O_NOCTTY);
	481	if (null_fd < 0) {
	482	log_error_errno(errno, "Failed to open /dev/null: %m");
	483	_exit(EXIT_FAILURE);
	484	}
	485
	486	if (dup2(null_fd, STDOUT_FILENO) != STDOUT_FILENO) {
	487	log_error_errno(errno, "Failed to dup2() fd: %m");
	488	_exit(EXIT_FAILURE);
	489	}
	490
	491	if (null_fd != STDOUT_FILENO)
	492	null_fd = safe_close(null_fd);
	493
0acfdffe LP	494	cmd[k++] = strjoina("--homedir=", gpg_home);
0acfdffe LP	495
98c38001 LP	496	/* We add the user keyring only to the command line
	497	* arguments, if it's around since gpg fails
	498	* otherwise. */
	499	if (access(USER_KEYRING_PATH, F_OK) >= 0)
	500	cmd[k++] = "--keyring=" USER_KEYRING_PATH;
1c49d1ba LP	501	else
1c49d1ba LP	502	cmd[k++] = "--keyring=" VENDOR_KEYRING_PATH;
98c38001 LP	503
	504	cmd[k++] = "--verify";
	505	cmd[k++] = sig_file_path;
	506	cmd[k++] = "-";
	507	cmd[k++] = NULL;
	508
3d7415f4 LP	509	fd_cloexec(STDIN_FILENO, false);
	510	fd_cloexec(STDOUT_FILENO, false);
	511	fd_cloexec(STDERR_FILENO, false);
	512
0acfdffe	513	execvp("gpg2", (char * const *) cmd);
98c38001 LP	514	execvp("gpg", (char * const *) cmd);
	515	log_error_errno(errno, "Failed to execute gpg: %m");
	516	_exit(EXIT_FAILURE);
	517	}
	518
	519	gpg_pipe[0] = safe_close(gpg_pipe[0]);
	520
	521	r = loop_write(gpg_pipe[1], checksum_job->payload, checksum_job->payload_size, false);
	522	if (r < 0) {
	523	log_error_errno(r, "Failed to write to pipe: %m");
	524	goto finish;
	525	}
	526
	527	gpg_pipe[1] = safe_close(gpg_pipe[1]);
	528
	529	r = wait_for_terminate_and_warn("gpg", pid, true);
	530	pid = 0;
	531	if (r < 0)
	532	goto finish;
	533	if (r > 0) {
9854730b	534	log_error("DOWNLOAD INVALID: Signature verification failed.");
98c38001 LP	535	r = -EBADMSG;
	536	} else {
	537	log_info("Signature verification succeeded.");
	538	r = 0;
	539	}
	540
	541	finish:
	542	if (sig_file >= 0)
9854730b	543	(void) unlink(sig_file_path);
98c38001	544
0acfdffe	545	if (gpg_home_created)
c6878637	546	(void) rm_rf(gpg_home, REMOVE_ROOT\|REMOVE_PHYSICAL);
0acfdffe	547
98c38001 LP	548	return r;
98c38001 LP	549	}