15057632786

Committed 15 May 2025 09:01PM UTC coverage: 72.267% (+0.02%) from 72.244%

Build # 15057632786

Build Type

push

github

Committed by

bluca

Commit Message

man: document how to hook stuff into system wakeup

Fixes: #6364

Coverage Stats

298523 of 413084 relevant lines covered (72.27%)

738132.88 hits per line

Source File
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0.0

/src/veritysetup/veritysetup-generator.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>

#include "sd-id128.h"

#include "alloc-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "fstab-util.h"
#include "generator.h"
#include "hexdecoct.h"
#include "log.h"
#include "parse-util.h"
#include "path-util.h"
#include "proc-cmdline.h"
#include "specifier.h"
#include "string-util.h"
#include "strv.h"
#include "unit-name.h"

static const char *arg_dest = NULL;
static bool arg_enabled = true;
static bool arg_read_veritytab = true;
static const char *arg_veritytab = NULL;
static char *arg_root_hash = NULL;
static char *arg_root_data_what = NULL;
static char *arg_root_hash_what = NULL;
static char *arg_root_options = NULL;
static char *arg_usr_hash = NULL;
static char *arg_usr_data_what = NULL;
static char *arg_usr_hash_what = NULL;
static char *arg_usr_options = NULL;

STATIC_DESTRUCTOR_REGISTER(arg_root_hash, freep);
STATIC_DESTRUCTOR_REGISTER(arg_root_data_what, freep);
STATIC_DESTRUCTOR_REGISTER(arg_root_hash_what, freep);
STATIC_DESTRUCTOR_REGISTER(arg_root_options, freep);
STATIC_DESTRUCTOR_REGISTER(arg_usr_hash, freep);
STATIC_DESTRUCTOR_REGISTER(arg_usr_data_what, freep);
STATIC_DESTRUCTOR_REGISTER(arg_usr_hash_what, freep);
STATIC_DESTRUCTOR_REGISTER(arg_usr_options, freep);

static int create_special_device(
                const char *name,
                const char *roothash,
                const char *data_what,
                const char *hash_what,
                const char *options) {

        _cleanup_free_ char *u = NULL, *v = NULL, *d = NULL, *e = NULL;
        _cleanup_fclose_ FILE *f = NULL;
        int r;

        /* Creates a systemd-veritysetup@.service instance for the special kernel cmdline specified root + usr devices. */

        assert(name);

        /* If all three pieces of information are missing, then verity is turned off */
        if (!roothash && !data_what && !hash_what)
                return 0;

        /* if one of them is missing however, the data is simply incomplete and this is an error */
        if (!roothash)
                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Verity information for %s incomplete, root hash unspecified.", name);
        if (!data_what)
                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Verity information for %s incomplete, data device unspecified.", name);
        if (!hash_what)
                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Verity information for %s incomplete, hash device unspecified.", name);

        _cleanup_free_ char *service = NULL;
        r = unit_name_build("systemd-veritysetup", name, ".service", &service);
        if (r < 0)
                return log_error_errno(r, "Failed to generate unit name: %m");

        log_debug("Using %s verity data device %s, hash device %s, options %s, and hash %s.", name, data_what, hash_what, options, roothash);

        u = fstab_node_to_udev_node(data_what);
        if (!u)
                return log_oom();
        v = fstab_node_to_udev_node(hash_what);
        if (!v)
                return log_oom();

        r = unit_name_from_path(u, ".device", &d);
        if (r < 0)
                return log_error_errno(r, "Failed to generate unit name: %m");
        r = unit_name_from_path(v, ".device", &e);
        if (r < 0)
                return log_error_errno(r, "Failed to generate unit name: %m");

        r = generator_open_unit_file(arg_dest, "/proc/cmdline", service, &f);
        if (r < 0)
                return r;

        r = generator_write_veritysetup_unit_section(f, "/proc/cmdline");
        if (r < 0)
                return r;

        fprintf(f,
                "Before=veritysetup.target\n"
                "BindsTo=%1$s %2$s\n"
                "After=%1$s %2$s\n",
                d, e);

        r = generator_write_veritysetup_service_section(f, name, u, v, roothash, options);
        if (r < 0)
                return r;

        r = fflush_and_check(f);
        if (r < 0)
                return log_error_errno(r, "Failed to write file unit %s: %m", service);

        r = generator_add_symlink(arg_dest, "veritysetup.target", "requires", service);
        if (r < 0)
                return r;

        return 0;
}

static int create_root_device(void) {
        return create_special_device("root", arg_root_hash, arg_root_data_what, arg_root_hash_what, arg_root_options);
}

static int create_usr_device(void) {
        return create_special_device("usr", arg_usr_hash, arg_usr_data_what, arg_usr_hash_what, arg_usr_options);
}

static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
        int r;

        assert(key);

        if (streq(key, "systemd.verity")) {

                r = value ? parse_boolean(value) : 1;
                if (r < 0)
                        log_warning("Failed to parse verity= kernel command line switch %s. Ignoring.", value);
                else
                        arg_enabled = r;

        } else if (streq(key, "veritytab")) {

                r = value ? parse_boolean(value) : 1;
                if (r < 0)
                        log_warning("Failed to parse veritytab= kernel command line switch %s. Ignoring.", value);
                else
                        arg_read_veritytab = r;

        } else if (streq(key, "roothash")) {

                if (proc_cmdline_value_missing(key, value))
                        return 0;

                r = free_and_strdup(&arg_root_hash, value);
                if (r < 0)
                        return log_oom();

        } else if (proc_cmdline_key_streq(key, "systemd.verity_root_data")) {

                if (proc_cmdline_value_missing(key, value))
                        return 0;

                r = free_and_strdup(&arg_root_data_what, value);
                if (r < 0)
                        return log_oom();

        } else if (proc_cmdline_key_streq(key, "systemd.verity_root_hash")) {

                if (proc_cmdline_value_missing(key, value))
                        return 0;

                r = free_and_strdup(&arg_root_hash_what, value);
                if (r < 0)
                        return log_oom();

        } else if (proc_cmdline_key_streq(key, "systemd.verity_root_options")) {

                if (proc_cmdline_value_missing(key, value))
                        return 0;

                r = free_and_strdup(&arg_root_options, value);
                if (r < 0)
                        return log_oom();

        } else if (streq(key, "usrhash")) {

                if (proc_cmdline_value_missing(key, value))
                        return 0;

                r = free_and_strdup(&arg_usr_hash, value);
                if (r < 0)
                        return log_oom();

        } else if (proc_cmdline_key_streq(key, "systemd.verity_usr_data")) {

                if (proc_cmdline_value_missing(key, value))
                        return 0;

                r = free_and_strdup(&arg_usr_data_what, value);
                if (r < 0)
                        return log_oom();

        } else if (proc_cmdline_key_streq(key, "systemd.verity_usr_hash")) {

                if (proc_cmdline_value_missing(key, value))
                        return 0;

                r = free_and_strdup(&arg_usr_hash_what, value);
                if (r < 0)
                        return log_oom();

        } else if (proc_cmdline_key_streq(key, "systemd.verity_usr_options")) {

                if (proc_cmdline_value_missing(key, value))
                        return 0;

                r = free_and_strdup(&arg_usr_options, value);
                if (r < 0)
                        return log_oom();
        }

        return 0;
}

static int determine_device(
                const char *name,
                const char *hash,
                char **data_what,
                char **hash_what) {

        sd_id128_t data_uuid, verity_uuid;
        _cleanup_free_ void *m = NULL;
        size_t l;
        int r;

        assert(name);
        assert(data_what);
        assert(hash_what);

        if (!hash)
                return 0;

        if (*data_what && *hash_what)
                return 0;

        r = unhexmem(hash, &m, &l);
        if (r < 0)
                return log_error_errno(r, "Failed to parse hash: %s", hash);
        if (l < sizeof(sd_id128_t)) {
                log_debug("Root hash for %s is shorter than 128 bits (32 characters), ignoring for discovering verity partition.", name);
                return 0;
        }

        if (!*data_what) {
                memcpy(&data_uuid, m, sizeof(data_uuid));

                *data_what = path_join("/dev/disk/by-partuuid", SD_ID128_TO_UUID_STRING(data_uuid));
                if (!*data_what)
                        return log_oom();
        }

        if (!*hash_what) {
                memcpy(&verity_uuid, (uint8_t*) m + l - sizeof(verity_uuid), sizeof(verity_uuid));

                *hash_what = path_join("/dev/disk/by-partuuid", SD_ID128_TO_UUID_STRING(verity_uuid));
                if (!*hash_what)
                        return log_oom();
        }

        log_info("Using data device %s and hash device %s for %s.", *data_what, *hash_what, name);

        return 1;
}

static int determine_devices(void) {
        int r;

        r = determine_device("root", arg_root_hash, &arg_root_data_what, &arg_root_hash_what);
        if (r < 0)
                return r;

        return determine_device("usr", arg_usr_hash, &arg_usr_data_what, &arg_usr_hash_what);
}

static bool attach_in_initrd(const char *name, const char *options) {
        assert(name);

        /* Imply x-initrd.attach in case the volume name is among those defined in the Discoverable Partition
         * Specification for partitions that we require to be mounted during the initrd → host transition,
         * i.e. for the root fs itself, and /usr/. This mirrors similar behaviour in
         * systemd-fstab-generator. */

        return fstab_test_option(options, "x-initrd.attach\0") ||
                STR_IN_SET(name, "root", "usr");
}

static int create_veritytab_device(
                const char *name,
                const char *data_device,
                const char *hash_device,
                const char *roothash,
                const char *options,
                const char *source) {

        _cleanup_free_ char *n = NULL, *dd = NULL, *du = NULL, *hd = NULL, *hu = NULL, *e = NULL,
                            *du_escaped = NULL, *hu_escaped = NULL, *name_escaped = NULL;
        _cleanup_fclose_ FILE *f = NULL;
        const char *dmname;
        bool noauto, nofail, netdev, need_loop = false;
        int r;

        /* Creates a systemd-veritysetup@.service instance for volumes specified in /etc/veritytab. */

        assert(name);
        assert(data_device);
        assert(hash_device);
        assert(roothash);

        noauto = fstab_test_yes_no_option(options, "noauto\0" "auto\0");
        nofail = fstab_test_yes_no_option(options, "nofail\0" "fail\0");
        netdev = fstab_test_option(options, "_netdev\0");

        name_escaped = specifier_escape(name);
        if (!name_escaped)
                return log_oom();

        e = unit_name_escape(name);
        if (!e)
                return log_oom();

        du = fstab_node_to_udev_node(data_device);
        if (!du)
                return log_oom();

        hu = fstab_node_to_udev_node(hash_device);
        if (!hu)
                return log_oom();

        r = unit_name_build("systemd-veritysetup", e, ".service", &n);
        if (r < 0)
                return log_error_errno(r, "Failed to generate unit name: %m");

        du_escaped = specifier_escape(du);
        if (!du_escaped)
                return log_oom();

        hu_escaped = specifier_escape(hu);
        if (!hu_escaped)
                return log_oom();

        r = unit_name_from_path(du, ".device", &dd);
        if (r < 0)
                return log_error_errno(r, "Failed to generate unit name: %m");

        r = unit_name_from_path(hu, ".device", &hd);
        if (r < 0)
                return log_error_errno(r, "Failed to generate unit name: %m");

        r = generator_open_unit_file(arg_dest, NULL, n, &f);
        if (r < 0)
                return r;

        r = generator_write_veritysetup_unit_section(f, source);
        if (r < 0)
                return r;

        if (netdev)
                fprintf(f, "After=remote-fs-pre.target\n");

        /* If initrd takes care of attaching the disk then it should also detach it during shutdown. */
        if (!attach_in_initrd(name, options))
                fprintf(f,
                        "Conflicts=umount.target\n"
                        "Before=umount.target\n");

        if (!nofail)
                fprintf(f,
                        "Before=%s\n",
                        netdev ? "remote-veritysetup.target" : "veritysetup.target");

        if (path_startswith(du, "/dev/"))
                fprintf(f,
                        "BindsTo=%s\n"
                        "After=%s\n",
                        dd, dd);
        else {
                fprintf(f, "RequiresMountsFor=%s\n", du_escaped);
                need_loop = true;
        }

        if (path_startswith(hu, "/dev/"))
                fprintf(f,
                        "BindsTo=%s\n"
                        "After=%s\n",
                        hd, hd);
        else {
                fprintf(f, "RequiresMountsFor=%s\n", hu_escaped);
                need_loop = true;
        }

        if (need_loop)
                /* For loopback devices make sure to explicitly load loop.ko, as this code might run very
                 * early where device nodes created via systemd-tmpfiles-setup-dev.service might not be
                 * around yet. Hence let's sync on the module itself. */
                fprintf(f,
                        "Wants=modprobe@loop.service\n"
                        "After=modprobe@loop.service\n");

        r = generator_write_veritysetup_service_section(f, name, du, hu, roothash, options);
        if (r < 0)
                return r;

        r = fflush_and_check(f);
        if (r < 0)
                return log_error_errno(r, "Failed to write unit file %s: %m", n);

        if (!noauto) {
                r = generator_add_symlink(arg_dest,
                                          netdev ? "remote-veritysetup.target" : "veritysetup.target",
                                          nofail ? "wants" : "requires", n);
                if (r < 0)
                        return r;
        }

        dmname = strjoina("dev-mapper-", e, ".device");
        return generator_add_symlink(arg_dest, dmname, "requires", n);
}

static int add_veritytab_devices(void) {
        _cleanup_fclose_ FILE *f = NULL;
        unsigned veritytab_line = 0;
        int r;

        if (!arg_read_veritytab)
                return 0;

        r = fopen_unlocked(arg_veritytab, "re", &f);
        if (r < 0) {
                if (errno != ENOENT)
                        log_error_errno(errno, "Failed to open %s: %m", arg_veritytab);
                return 0;
        }

        for (;;) {
                _cleanup_free_ char *line = NULL, *name = NULL, *data_device = NULL, *hash_device = NULL,
                                    *roothash = NULL, *options = NULL;

                r = read_stripped_line(f, LONG_LINE_MAX, &line);
                if (r < 0)
                        return log_error_errno(r, "Failed to read %s: %m", arg_veritytab);
                if (r == 0)
                        break;

                veritytab_line++;

                if (IN_SET(line[0], 0, '#'))
                        continue;

                r = sscanf(line, "%ms %ms %ms %ms %ms", &name, &data_device, &hash_device, &roothash, &options);
                if (!IN_SET(r, 4, 5)) {
                        log_error("Failed to parse %s:%u, ignoring.", arg_veritytab, veritytab_line);
                        continue;
                }

                r = create_veritytab_device(
                                name,
                                data_device,
                                hash_device,
                                roothash,
                                options,
                                arg_veritytab);
                if (r < 0)
                        return r;
        }

        return 0;
}

static int run(const char *dest, const char *dest_early, const char *dest_late) {
        int r;

        assert_se(arg_dest = dest);

        arg_veritytab = getenv("SYSTEMD_VERITYTAB") ?: "/etc/veritytab";

        r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX);
        if (r < 0)
                return log_warning_errno(r, "Failed to parse kernel command line: %m");

        if (!arg_enabled)
                return 0;

        r = add_veritytab_devices();
        if (r < 0)
                return r;

        r = determine_devices();
        if (r < 0)
                return r;

        r = create_root_device();
        if (r < 0)
                return r;

        return create_usr_device();
}

DEFINE_MAIN_GENERATOR_FUNCTION(run);

1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3	#include <stdlib.h>
4	#include <sys/stat.h>
5	#include <unistd.h>
6
7	#include "sd-id128.h"
8
9	#include "alloc-util.h"
10	#include "fd-util.h"
11	#include "fileio.h"
12	#include "fstab-util.h"
13	#include "generator.h"
14	#include "hexdecoct.h"
15	#include "log.h"
16	#include "parse-util.h"
17	#include "path-util.h"
18	#include "proc-cmdline.h"
19	#include "specifier.h"
20	#include "string-util.h"
21	#include "strv.h"
22	#include "unit-name.h"
23
24	static const char *arg_dest = NULL;
25	static bool arg_enabled = true;
26	static bool arg_read_veritytab = true;
27	static const char *arg_veritytab = NULL;
28	static char *arg_root_hash = NULL;
29	static char *arg_root_data_what = NULL;
30	static char *arg_root_hash_what = NULL;
31	static char *arg_root_options = NULL;
32	static char *arg_usr_hash = NULL;
33	static char *arg_usr_data_what = NULL;
34	static char *arg_usr_hash_what = NULL;
35	static char *arg_usr_options = NULL;
36
37	STATIC_DESTRUCTOR_REGISTER(arg_root_hash, freep);	×
38	STATIC_DESTRUCTOR_REGISTER(arg_root_data_what, freep);	×
39	STATIC_DESTRUCTOR_REGISTER(arg_root_hash_what, freep);	×
40	STATIC_DESTRUCTOR_REGISTER(arg_root_options, freep);	×
41	STATIC_DESTRUCTOR_REGISTER(arg_usr_hash, freep);	×
42	STATIC_DESTRUCTOR_REGISTER(arg_usr_data_what, freep);	×
43	STATIC_DESTRUCTOR_REGISTER(arg_usr_hash_what, freep);	×
44	STATIC_DESTRUCTOR_REGISTER(arg_usr_options, freep);	×
45
46	static int create_special_device(	×
47	const char *name,
48	const char *roothash,
49	const char *data_what,
50	const char *hash_what,
51	const char *options) {
52
53	_cleanup_free_ char u = NULL, v = NULL, d = NULL, e = NULL;	×
54	_cleanup_fclose_ FILE *f = NULL;	×
55	int r;	×
56
57	/* Creates a systemd-veritysetup@.service instance for the special kernel cmdline specified root + usr devices. */
58
59	assert(name);	×
60
61	/* If all three pieces of information are missing, then verity is turned off */
62	if (!roothash && !data_what && !hash_what)	×
63	return 0;
64
65	/* if one of them is missing however, the data is simply incomplete and this is an error */
66	if (!roothash)	×
67	return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Verity information for %s incomplete, root hash unspecified.", name);	×
68	if (!data_what)	×
69	return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Verity information for %s incomplete, data device unspecified.", name);	×
70	if (!hash_what)	×
71	return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Verity information for %s incomplete, hash device unspecified.", name);	×
72
73	_cleanup_free_ char *service = NULL;	×
74	r = unit_name_build("systemd-veritysetup", name, ".service", &service);	×
75	if (r < 0)	×
76	return log_error_errno(r, "Failed to generate unit name: %m");	×
77
78	log_debug("Using %s verity data device %s, hash device %s, options %s, and hash %s.", name, data_what, hash_what, options, roothash);	×
79
80	u = fstab_node_to_udev_node(data_what);	×
81	if (!u)	×
82	return log_oom();	×
83	v = fstab_node_to_udev_node(hash_what);	×
84	if (!v)	×
85	return log_oom();	×
86
87	r = unit_name_from_path(u, ".device", &d);	×
88	if (r < 0)	×
89	return log_error_errno(r, "Failed to generate unit name: %m");	×
90	r = unit_name_from_path(v, ".device", &e);	×
91	if (r < 0)	×
92	return log_error_errno(r, "Failed to generate unit name: %m");	×
93
94	r = generator_open_unit_file(arg_dest, "/proc/cmdline", service, &f);	×
95	if (r < 0)	×
96	return r;
97
98	r = generator_write_veritysetup_unit_section(f, "/proc/cmdline");	×
99	if (r < 0)	×
100	return r;
101
102	fprintf(f,	×
103	"Before=veritysetup.target\n"
104	"BindsTo=%1$s %2$s\n"
105	"After=%1$s %2$s\n",
106	d, e);
107
108	r = generator_write_veritysetup_service_section(f, name, u, v, roothash, options);	×
109	if (r < 0)	×
110	return r;
111
112	r = fflush_and_check(f);	×
113	if (r < 0)	×
114	return log_error_errno(r, "Failed to write file unit %s: %m", service);	×
115
116	r = generator_add_symlink(arg_dest, "veritysetup.target", "requires", service);	×
117	if (r < 0)	×
118	return r;	×
119
120	return 0;
121	}
122
123	static int create_root_device(void) {	×
124	return create_special_device("root", arg_root_hash, arg_root_data_what, arg_root_hash_what, arg_root_options);	×
125	}
126
127	static int create_usr_device(void) {	×
128	return create_special_device("usr", arg_usr_hash, arg_usr_data_what, arg_usr_hash_what, arg_usr_options);	×
129	}
130
131	static int parse_proc_cmdline_item(const char key, const char value, void *data) {	×
132	int r;	×
133
134	assert(key);	×
135
136	if (streq(key, "systemd.verity")) {	×
137
138	r = value ? parse_boolean(value) : 1;	×
139	if (r < 0)	×
140	log_warning("Failed to parse verity= kernel command line switch %s. Ignoring.", value);	×
141	else
142	arg_enabled = r;	×
143
144	} else if (streq(key, "veritytab")) {	×
145
146	r = value ? parse_boolean(value) : 1;	×
147	if (r < 0)	×
148	log_warning("Failed to parse veritytab= kernel command line switch %s. Ignoring.", value);	×
149	else
150	arg_read_veritytab = r;	×
151
152	} else if (streq(key, "roothash")) {	×
153
154	if (proc_cmdline_value_missing(key, value))	×
155	return 0;
156
157	r = free_and_strdup(&arg_root_hash, value);	×
158	if (r < 0)	×
159	return log_oom();	×
160
161	} else if (proc_cmdline_key_streq(key, "systemd.verity_root_data")) {	×
162
163	if (proc_cmdline_value_missing(key, value))	×
164	return 0;
165
166	r = free_and_strdup(&arg_root_data_what, value);	×
167	if (r < 0)	×
168	return log_oom();	×
169
170	} else if (proc_cmdline_key_streq(key, "systemd.verity_root_hash")) {	×
171
172	if (proc_cmdline_value_missing(key, value))	×
173	return 0;
174
175	r = free_and_strdup(&arg_root_hash_what, value);	×
176	if (r < 0)	×
177	return log_oom();	×
178
179	} else if (proc_cmdline_key_streq(key, "systemd.verity_root_options")) {	×
180
181	if (proc_cmdline_value_missing(key, value))	×
182	return 0;
183
184	r = free_and_strdup(&arg_root_options, value);	×
185	if (r < 0)	×
186	return log_oom();	×
187
188	} else if (streq(key, "usrhash")) {	×
189
190	if (proc_cmdline_value_missing(key, value))	×
191	return 0;
192
193	r = free_and_strdup(&arg_usr_hash, value);	×
194	if (r < 0)	×
195	return log_oom();	×
196
197	} else if (proc_cmdline_key_streq(key, "systemd.verity_usr_data")) {	×
198
199	if (proc_cmdline_value_missing(key, value))	×
200	return 0;
201
202	r = free_and_strdup(&arg_usr_data_what, value);	×
203	if (r < 0)	×
204	return log_oom();	×
205
206	} else if (proc_cmdline_key_streq(key, "systemd.verity_usr_hash")) {	×
207
208	if (proc_cmdline_value_missing(key, value))	×
209	return 0;
210
211	r = free_and_strdup(&arg_usr_hash_what, value);	×
212	if (r < 0)	×
213	return log_oom();	×
214
215	} else if (proc_cmdline_key_streq(key, "systemd.verity_usr_options")) {	×
216
217	if (proc_cmdline_value_missing(key, value))	×
218	return 0;
219
220	r = free_and_strdup(&arg_usr_options, value);	×
221	if (r < 0)	×
222	return log_oom();	×
223	}
224
225	return 0;
226	}
227
228	static int determine_device(	×
229	const char *name,
230	const char *hash,
231	char **data_what,
232	char **hash_what) {
233
234	sd_id128_t data_uuid, verity_uuid;	×
235	_cleanup_free_ void *m = NULL;	×
236	size_t l;	×
237	int r;	×
238
239	assert(name);	×
240	assert(data_what);	×
241	assert(hash_what);	×
242
243	if (!hash)	×
244	return 0;
245
246	if (data_what && hash_what)	×
247	return 0;
248
249	r = unhexmem(hash, &m, &l);	×
250	if (r < 0)	×
251	return log_error_errno(r, "Failed to parse hash: %s", hash);	×
252	if (l < sizeof(sd_id128_t)) {	×
253	log_debug("Root hash for %s is shorter than 128 bits (32 characters), ignoring for discovering verity partition.", name);	×
254	return 0;	×
255	}
256
257	if (!*data_what) {	×
258	memcpy(&data_uuid, m, sizeof(data_uuid));	×
259
260	*data_what = path_join("/dev/disk/by-partuuid", SD_ID128_TO_UUID_STRING(data_uuid));	×
261	if (!*data_what)	×
262	return log_oom();	×
263	}
264
265	if (!*hash_what) {	×
266	memcpy(&verity_uuid, (uint8_t*) m + l - sizeof(verity_uuid), sizeof(verity_uuid));	×
267
268	*hash_what = path_join("/dev/disk/by-partuuid", SD_ID128_TO_UUID_STRING(verity_uuid));	×
269	if (!*hash_what)	×
270	return log_oom();	×
271	}
272
273	log_info("Using data device %s and hash device %s for %s.", data_what, hash_what, name);	×
274
275	return 1;
276	}
277
278	static int determine_devices(void) {	×
279	int r;	×
280
281	r = determine_device("root", arg_root_hash, &arg_root_data_what, &arg_root_hash_what);	×
282	if (r < 0)	×
283	return r;
284
285	return determine_device("usr", arg_usr_hash, &arg_usr_data_what, &arg_usr_hash_what);	×
286	}
287
288	static bool attach_in_initrd(const char name, const char options) {	×
289	assert(name);	×
290
291	/* Imply x-initrd.attach in case the volume name is among those defined in the Discoverable Partition
292	* Specification for partitions that we require to be mounted during the initrd → host transition,
293	* i.e. for the root fs itself, and /usr/. This mirrors similar behaviour in
294	* systemd-fstab-generator. */
295
296	return fstab_test_option(options, "x-initrd.attach\0") \|\|	×
297	STR_IN_SET(name, "root", "usr");	×
298	}
299
300	static int create_veritytab_device(	×
301	const char *name,
302	const char *data_device,
303	const char *hash_device,
304	const char *roothash,
305	const char *options,
306	const char *source) {
307
308	_cleanup_free_ char n = NULL, dd = NULL, du = NULL, hd = NULL, hu = NULL, e = NULL,	×
309	du_escaped = NULL, hu_escaped = NULL, *name_escaped = NULL;	×
310	_cleanup_fclose_ FILE *f = NULL;	×
311	const char *dmname;	×
312	bool noauto, nofail, netdev, need_loop = false;	×
313	int r;	×
314
315	/* Creates a systemd-veritysetup@.service instance for volumes specified in /etc/veritytab. */
316
317	assert(name);	×
318	assert(data_device);	×
319	assert(hash_device);	×
320	assert(roothash);	×
321
322	noauto = fstab_test_yes_no_option(options, "noauto\0" "auto\0");	×
323	nofail = fstab_test_yes_no_option(options, "nofail\0" "fail\0");	×
324	netdev = fstab_test_option(options, "_netdev\0");	×
325
326	name_escaped = specifier_escape(name);	×
327	if (!name_escaped)	×
328	return log_oom();	×
329
330	e = unit_name_escape(name);	×
331	if (!e)	×
332	return log_oom();	×
333
334	du = fstab_node_to_udev_node(data_device);	×
335	if (!du)	×
336	return log_oom();	×
337
338	hu = fstab_node_to_udev_node(hash_device);	×
339	if (!hu)	×
340	return log_oom();	×
341
342	r = unit_name_build("systemd-veritysetup", e, ".service", &n);	×
343	if (r < 0)	×
344	return log_error_errno(r, "Failed to generate unit name: %m");	×
345
346	du_escaped = specifier_escape(du);	×
347	if (!du_escaped)	×
348	return log_oom();	×
349
350	hu_escaped = specifier_escape(hu);	×
351	if (!hu_escaped)	×
352	return log_oom();	×
353
354	r = unit_name_from_path(du, ".device", &dd);	×
355	if (r < 0)	×
356	return log_error_errno(r, "Failed to generate unit name: %m");	×
357
358	r = unit_name_from_path(hu, ".device", &hd);	×
359	if (r < 0)	×
360	return log_error_errno(r, "Failed to generate unit name: %m");	×
361
362	r = generator_open_unit_file(arg_dest, NULL, n, &f);	×
363	if (r < 0)	×
364	return r;
365
366	r = generator_write_veritysetup_unit_section(f, source);	×
367	if (r < 0)	×
368	return r;
369
370	if (netdev)	×
371	fprintf(f, "After=remote-fs-pre.target\n");	×
372
373	/* If initrd takes care of attaching the disk then it should also detach it during shutdown. */
374	if (!attach_in_initrd(name, options))	×
375	fprintf(f,	×
376	"Conflicts=umount.target\n"
377	"Before=umount.target\n");
378
379	if (!nofail)	×
380	fprintf(f,	×
381	"Before=%s\n",
382	netdev ? "remote-veritysetup.target" : "veritysetup.target");
383
384	if (path_startswith(du, "/dev/"))	×
385	fprintf(f,	×
386	"BindsTo=%s\n"
387	"After=%s\n",
388	dd, dd);
389	else {
390	fprintf(f, "RequiresMountsFor=%s\n", du_escaped);	×
391	need_loop = true;
392	}
393
394	if (path_startswith(hu, "/dev/"))	×
395	fprintf(f,	×
396	"BindsTo=%s\n"
397	"After=%s\n",
398	hd, hd);
399	else {
400	fprintf(f, "RequiresMountsFor=%s\n", hu_escaped);	×
401	need_loop = true;
402	}
403
404	if (need_loop)	×
405	/* For loopback devices make sure to explicitly load loop.ko, as this code might run very
406	* early where device nodes created via systemd-tmpfiles-setup-dev.service might not be
407	* around yet. Hence let's sync on the module itself. */
408	fprintf(f,	×
409	"Wants=modprobe@loop.service\n"
410	"After=modprobe@loop.service\n");
411
412	r = generator_write_veritysetup_service_section(f, name, du, hu, roothash, options);	×
413	if (r < 0)	×
414	return r;
415
416	r = fflush_and_check(f);	×
417	if (r < 0)	×
418	return log_error_errno(r, "Failed to write unit file %s: %m", n);	×
419
420	if (!noauto) {	×
421	r = generator_add_symlink(arg_dest,	×
422	netdev ? "remote-veritysetup.target" : "veritysetup.target",
423	nofail ? "wants" : "requires", n);
424	if (r < 0)	×
425	return r;
426	}
427
428	dmname = strjoina("dev-mapper-", e, ".device");	×
429	return generator_add_symlink(arg_dest, dmname, "requires", n);	×
430	}
431
432	static int add_veritytab_devices(void) {	×
433	_cleanup_fclose_ FILE *f = NULL;	×
434	unsigned veritytab_line = 0;	×
435	int r;	×
436
437	if (!arg_read_veritytab)	×
438	return 0;
439
440	r = fopen_unlocked(arg_veritytab, "re", &f);	×
441	if (r < 0) {	×
442	if (errno != ENOENT)	×
443	log_error_errno(errno, "Failed to open %s: %m", arg_veritytab);	×
444	return 0;	×
445	}
446
447	for (;;) {	×
448	_cleanup_free_ char line = NULL, name = NULL, data_device = NULL, hash_device = NULL,	×
449	roothash = NULL, options = NULL;	×
450
451	r = read_stripped_line(f, LONG_LINE_MAX, &line);	×
452	if (r < 0)	×
453	return log_error_errno(r, "Failed to read %s: %m", arg_veritytab);	×
454	if (r == 0)	×
455	break;
456
457	veritytab_line++;	×
458
459	if (IN_SET(line[0], 0, '#'))	×
460	continue;	×
461
462	r = sscanf(line, "%ms %ms %ms %ms %ms", &name, &data_device, &hash_device, &roothash, &options);	×
463	if (!IN_SET(r, 4, 5)) {	×
464	log_error("Failed to parse %s:%u, ignoring.", arg_veritytab, veritytab_line);	×
465	continue;	×
466	}
467
468	r = create_veritytab_device(	×
469	name,
470	data_device,
471	hash_device,
472	roothash,
473	options,
474	arg_veritytab);
475	if (r < 0)	×
476	return r;
477	}
478
479	return 0;	×
480	}
481
482	static int run(const char dest, const char dest_early, const char *dest_late) {	×
483	int r;	×
484
485	assert_se(arg_dest = dest);	×
486
487	arg_veritytab = getenv("SYSTEMD_VERITYTAB") ?: "/etc/veritytab";	×
488
489	r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX);	×
490	if (r < 0)	×
491	return log_warning_errno(r, "Failed to parse kernel command line: %m");	×
492
493	if (!arg_enabled)	×
494	return 0;
495
496	r = add_veritytab_devices();	×
497	if (r < 0)	×
498	return r;
499
500	r = determine_devices();	×
501	if (r < 0)	×
502	return r;
503
504	r = create_root_device();	×
505	if (r < 0)	×
506	return r;
507
508	return create_usr_device();	×
509	}
510
511	DEFINE_MAIN_GENERATOR_FUNCTION(run);	×

systemd / systemd / 15057632786

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