Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

5 files changed, 505 insertions, 0 deletions

diff --git a/src/integritysetup/integrity-util.c b/src/integritysetup/integrity-util.c
new file mode 100644
index 0000000..c29d4fc
--- /dev/null
+++ b/src/integritysetup/integrity-util.c
@@ -0,0 +1,86 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#include "integrity-util.h"
+
+#include "extract-word.h"
+#include "fileio.h"
+#include "path-util.h"
+#include "percent-util.h"
+
+
+static int supported_integrity_algorithm(char *user_supplied) {
+        if (!STR_IN_SET(user_supplied, "crc32", "crc32c", "sha1", "sha256", "hmac-sha256"))
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unsupported integrity algorithm (%s)", user_supplied);
+        return 0;
+}
+
+int parse_integrity_options(
+                const char *options,
+                uint32_t *ret_activate_flags,
+                int *ret_percent,
+                usec_t *ret_commit_time,
+                char **ret_data_device,
+                char **ret_integrity_alg) {
+        int r;
+
+        for (;;) {
+                _cleanup_free_ char *word = NULL;
+                char *val;
+
+                r = extract_first_word(&options, &word, ",", EXTRACT_DONT_COALESCE_SEPARATORS | EXTRACT_UNESCAPE_SEPARATORS);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to parse options: %m");
+                if (r == 0)
+                        break;
+                else if (streq(word, "allow-discards")) {
+                        if (ret_activate_flags)
+                                *ret_activate_flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS;
+                } else if ((val = startswith(word, "mode="))) {
+                        if (streq(val, "journal")) {
+                                if (ret_activate_flags)
+                                        *ret_activate_flags &= ~(CRYPT_ACTIVATE_NO_JOURNAL | CRYPT_ACTIVATE_NO_JOURNAL_BITMAP);
+                        } else if (streq(val, "bitmap")) {
+                                if (ret_activate_flags) {
+                                        *ret_activate_flags &= ~CRYPT_ACTIVATE_NO_JOURNAL;
+                                        *ret_activate_flags |= CRYPT_ACTIVATE_NO_JOURNAL_BITMAP;
+                                }
+                        } else if (streq(val, "direct")) {
+                                if (ret_activate_flags) {
+                                        *ret_activate_flags |= CRYPT_ACTIVATE_NO_JOURNAL;
+                                        *ret_activate_flags &= ~CRYPT_ACTIVATE_NO_JOURNAL_BITMAP;
+                                }
+                        } else
+                                log_warning("Encountered unknown mode option '%s', ignoring.", val);
+                } else if ((val = startswith(word, "journal-watermark="))) {
+                        r = parse_percent(val);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse journal-watermark value or value out of range (%s)", val);
+                        if (ret_percent)
+                                *ret_percent = r;
+                } else if ((val = startswith(word, "journal-commit-time="))) {
+                        usec_t tmp_commit_time;
+                        r = parse_sec(val, &tmp_commit_time);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse journal-commit-time value (%s)", val);
+                        if (ret_commit_time)
+                                *ret_commit_time = tmp_commit_time;
+                } else if ((val = startswith(word, "data-device="))) {
+                        if (ret_data_device) {
+                                r = free_and_strdup(ret_data_device, val);
+                                if (r < 0)
+                                        return log_oom();
+                        }
+                } else if ((val = startswith(word, "integrity-algorithm="))) {
+                        r = supported_integrity_algorithm(val);
+                        if (r < 0)
+                                return r;
+                        if (ret_integrity_alg) {
+                                r = free_and_strdup(ret_integrity_alg, val);
+                                if (r < 0)
+                                        return log_oom();
+                        }
+                } else
+                        log_warning("Encountered unknown option '%s', ignoring.", word);
+        }
+
+        return r;
+}
diff --git a/src/integritysetup/integrity-util.h b/src/integritysetup/integrity-util.h
new file mode 100644
index 0000000..b27975c
--- /dev/null
+++ b/src/integritysetup/integrity-util.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <stdint.h>
+
+#include "cryptsetup-util.h"
+#include "time-util.h"
+
+
+int parse_integrity_options(
+                const char *options,
+                uint32_t *ret_activate_flags,
+                int *ret_percent,
+                usec_t *ret_commit_time,
+                char **ret_data_device,
+                char **ret_integrity_alg);
+
+#define DM_HMAC_256 "hmac(sha256)"
+#define DM_MAX_KEY_SIZE 4096            /* Maximum size of key allowed for dm-integrity */
diff --git a/src/integritysetup/integritysetup-generator.c b/src/integritysetup/integritysetup-generator.c
new file mode 100644
index 0000000..72b8905
--- /dev/null
+++ b/src/integritysetup/integritysetup-generator.c
@@ -0,0 +1,176 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fstab-util.h"
+#include "generator.h"
+#include "hexdecoct.h"
+#include "id128-util.h"
+#include "integrity-util.h"
+#include "main-func.h"
+#include "mkdir.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "proc-cmdline.h"
+#include "specifier.h"
+#include "string-util.h"
+#include "unit-name.h"
+
+static const char *arg_dest = NULL;
+static const char *arg_integritytab = NULL;
+static char *arg_options = NULL;
+STATIC_DESTRUCTOR_REGISTER(arg_options, freep);
+
+static int create_disk(
+                const char *name,
+                const char *device,
+                const char *key_file,
+                const char *options) {
+
+        _cleanup_free_ char *n = NULL, *dd = NULL, *e = NULL, *name_escaped = NULL, *key_file_escaped = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
+        int r;
+        char *dmname = NULL;
+
+        assert(name);
+        assert(device);
+
+        name_escaped = specifier_escape(name);
+        if (!name_escaped)
+                return log_oom();
+
+        e = unit_name_escape(name);
+        if (!e)
+                return log_oom();
+
+        r = unit_name_build("systemd-integritysetup", e, ".service", &n);
+        if (r < 0)
+                return log_error_errno(r, "Failed to generate unit name: %m");
+
+        r = unit_name_from_path(device, ".device", &dd);
+        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;
+
+        if (key_file) {
+                if (!path_is_absolute(key_file))
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "key file not absolute file path %s", key_file);
+
+                key_file_escaped = specifier_escape(key_file);
+                if (!key_file_escaped)
+                        return log_oom();
+        }
+
+        if (options) {
+                r = parse_integrity_options(options, NULL, NULL, NULL, NULL, NULL);
+                if (r < 0)
+                        return r;
+        }
+
+        fprintf(f,
+                "[Unit]\n"
+                "Description=Integrity Setup for %%I\n"
+                "Documentation=man:integritytab(5) man:systemd-integritysetup-generator(8) man:systemd-integritysetup@.service(8)\n"
+                "SourcePath=%s\n"
+                "DefaultDependencies=no\n"
+                "IgnoreOnIsolate=true\n"
+                "After=integritysetup-pre.target systemd-udevd-kernel.socket\n"
+                "Before=blockdev@dev-mapper-%%i.target\n"
+                "Wants=blockdev@dev-mapper-%%i.target\n"
+                "Conflicts=umount.target\n"
+                "Before=integritysetup.target\n"
+                "BindsTo=%s\n"
+                "After=%s\n"
+                "Before=umount.target\n",
+                arg_integritytab,
+                dd, dd);
+
+        fprintf(f,
+                "\n"
+                "[Service]\n"
+                "Type=oneshot\n"
+                "RemainAfterExit=yes\n"
+                "TimeoutSec=infinity\n"
+                "ExecStart=" LIBEXECDIR "/systemd-integritysetup attach '%s' '%s' '%s' '%s'\n"
+                "ExecStop=" LIBEXECDIR "/systemd-integritysetup detach '%s'\n",
+                name_escaped, device, empty_to_dash(key_file_escaped), empty_to_dash(options),
+                name_escaped);
+
+        r = fflush_and_check(f);
+        if (r < 0)
+                return log_error_errno(r, "Failed to write unit file %s: %m", n);
+
+        r = generator_add_symlink(arg_dest, "integritysetup.target", "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_integritytab_devices(void) {
+        _cleanup_fclose_ FILE *f = NULL;
+        unsigned integritytab_line = 0;
+        int r;
+
+        r = fopen_unlocked(arg_integritytab, "re", &f);
+        if (r < 0) {
+                if (errno != ENOENT)
+                        log_error_errno(errno, "Failed to open %s: %m", arg_integritytab);
+                return 0;
+        }
+
+        for (;;) {
+                _cleanup_free_ char *line = NULL, *name = NULL, *device_id = NULL, *device_path = NULL, *key_file = 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_integritytab);
+                if (r == 0)
+                        break;
+
+                integritytab_line++;
+
+                if (IN_SET(line[0], 0, '#'))
+                        continue;
+
+                /* The key file and the options are optional */
+                r = sscanf(line, "%ms %ms %ms %ms", &name, &device_id, &key_file, &options);
+                if (!IN_SET(r, 2, 3, 4)) {
+                        log_error("Failed to parse %s:%u, ignoring.", arg_integritytab, integritytab_line);
+                        continue;
+                }
+
+                device_path = fstab_node_to_udev_node(device_id);
+                if (!device_path) {
+                        log_error("Failed to find device %s:%u, ignoring.", device_id, integritytab_line);
+                        continue;
+                }
+
+                r = create_disk(name, device_path, empty_or_dash_to_null(key_file), empty_or_dash_to_null(options));
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}
+
+static int run(const char *dest, const char *dest_early, const char *dest_late) {
+        assert_se(arg_dest = dest);
+
+        arg_integritytab = getenv("SYSTEMD_INTEGRITYTAB") ?: "/etc/integritytab";
+
+        return add_integritytab_devices();
+}
+
+DEFINE_MAIN_GENERATOR_FUNCTION(run);
diff --git a/src/integritysetup/integritysetup.c b/src/integritysetup/integritysetup.c
new file mode 100644
index 0000000..a602886
--- /dev/null
+++ b/src/integritysetup/integritysetup.c
@@ -0,0 +1,203 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <stdio.h>
+#include <sys/stat.h>
+
+#include "alloc-util.h"
+#include "cryptsetup-util.h"
+#include "fileio.h"
+#include "hexdecoct.h"
+#include "integrity-util.h"
+#include "log.h"
+#include "main-func.h"
+#include "memory-util.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "pretty-print.h"
+#include "process-util.h"
+#include "string-util.h"
+#include "terminal-util.h"
+
+static uint32_t arg_activate_flags;
+static int arg_percent;
+static usec_t arg_commit_time;
+static char *arg_existing_data_device;
+static char *arg_integrity_algorithm;
+
+STATIC_DESTRUCTOR_REGISTER(arg_existing_data_device, freep);
+STATIC_DESTRUCTOR_REGISTER(arg_integrity_algorithm, freep);
+
+static int help(void) {
+        _cleanup_free_ char *link = NULL;
+        int r;
+
+        r = terminal_urlify_man("systemd-integritysetup@.service", "8", &link);
+        if (r < 0)
+                return log_oom();
+
+        printf("%s attach VOLUME DEVICE [HMAC_KEY_FILE|-] [OPTIONS]\n"
+               "%s detach VOLUME\n\n"
+               "Attach or detach an integrity protected block device.\n"
+               "\nSee the %s for details.\n",
+               program_invocation_short_name,
+               program_invocation_short_name,
+               link);
+
+        return 0;
+}
+
+static int load_key_file(
+                const char *key_file,
+                void **ret_key_file_contents,
+                size_t *ret_key_file_size) {
+        int r;
+        _cleanup_(erase_and_freep) char *tmp_key_file_contents = NULL;
+        size_t tmp_key_file_size;
+
+        if (!path_is_absolute(key_file))
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "key file not absolute path: %s", key_file);
+
+        r = read_full_file_full(
+                        AT_FDCWD, key_file, UINT64_MAX, DM_MAX_KEY_SIZE,
+                        READ_FULL_FILE_SECURE|READ_FULL_FILE_WARN_WORLD_READABLE|READ_FULL_FILE_CONNECT_SOCKET|READ_FULL_FILE_FAIL_WHEN_LARGER,
+                        NULL,
+                        &tmp_key_file_contents, &tmp_key_file_size);
+        if (r < 0)
+                return log_error_errno(r, "Failed to process key file: %m");
+
+        if (ret_key_file_contents && ret_key_file_size) {
+                *ret_key_file_contents = TAKE_PTR(tmp_key_file_contents);
+                *ret_key_file_size = tmp_key_file_size;
+        }
+
+        return 0;
+}
+
+static const char *integrity_algorithm_select(const void *key_file_buf) {
+        /*  To keep a bit of sanity for end users, the subset of integrity
+            algorithms we support will match what is used in integritysetup */
+        if (arg_integrity_algorithm) {
+                if (streq("hmac-sha256", arg_integrity_algorithm))
+                        return DM_HMAC_256;
+                return arg_integrity_algorithm;
+        } else if (key_file_buf)
+                return DM_HMAC_256;
+        return "crc32c";
+}
+
+static int run(int argc, char *argv[]) {
+        _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
+        char *verb, *volume;
+        int r;
+
+        if (argv_looks_like_help(argc, argv))
+                return help();
+
+        if (argc < 3)
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "This program requires at least two arguments.");
+
+        verb = argv[1];
+        volume = argv[2];
+
+        log_setup();
+
+        cryptsetup_enable_logging(NULL);
+
+        umask(0022);
+
+        if (streq(verb, "attach")) {
+                /* attach name device optional_key_file optional_options */
+
+                crypt_status_info status;
+                _cleanup_(erase_and_freep) void *key_buf = NULL;
+                const char *device, *key_file, *options;
+                size_t key_buf_size = 0;
+
+                if (argc < 4)
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "attach requires at least three arguments.");
+
+                if (argc > 6)
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "attach has a maximum of five arguments.");
+
+                device = argv[3];
+                key_file = mangle_none(argc > 4 ? argv[4] : NULL);
+                options = mangle_none(argc > 5 ? argv[5] : NULL);
+
+                if (!filename_is_valid(volume))
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Volume name '%s' is not valid.", volume);
+
+                if (key_file) {
+                        r = load_key_file(key_file, &key_buf, &key_buf_size);
+                        if (r < 0)
+                                return r;
+                }
+
+                if (options) {
+                        r = parse_integrity_options(options, &arg_activate_flags, &arg_percent,
+                                                    &arg_commit_time, &arg_existing_data_device, &arg_integrity_algorithm);
+                        if (r < 0)
+                                return r;
+                }
+
+                r = crypt_init(&cd, device);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to open integrity device %s: %m", device);
+
+                cryptsetup_enable_logging(cd);
+
+                status = crypt_status(cd, volume);
+                if (IN_SET(status, CRYPT_ACTIVE, CRYPT_BUSY)) {
+                        log_info("Volume %s already active.", volume);
+                        return 0;
+                }
+
+                r = crypt_load(cd,
+                        CRYPT_INTEGRITY,
+                        &(struct crypt_params_integrity) {
+                                .journal_watermark = arg_percent,
+                                .journal_commit_time = DIV_ROUND_UP(arg_commit_time, USEC_PER_SEC),
+                                .integrity = integrity_algorithm_select(key_buf),
+                        });
+                if (r < 0)
+                        return log_error_errno(r, "Failed to load integrity superblock: %m");
+
+                if (!isempty(arg_existing_data_device)) {
+                        r = crypt_set_data_device(cd, arg_existing_data_device);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to add separate data device: %m");
+                }
+
+                r = crypt_activate_by_volume_key(cd, volume, key_buf, key_buf_size, arg_activate_flags);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to set up integrity device: %m");
+
+        } else if (streq(verb, "detach")) {
+
+                if (argc > 3)
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "detach has a maximum of two arguments.");
+
+                if (!filename_is_valid(volume))
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Volume name '%s' is not valid.", volume);
+
+                r = crypt_init_by_name(&cd, volume);
+                if (r == -ENODEV) {
+                        log_info("Volume %s already inactive.", volume);
+                        return 0;
+                }
+                if (r < 0)
+                        return log_error_errno(r, "crypt_init_by_name() failed: %m");
+
+                cryptsetup_enable_logging(cd);
+
+                r = crypt_deactivate(cd, volume);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to deactivate: %m");
+
+        } else
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown verb %s.", verb);
+
+        return 0;
+}
+
+DEFINE_MAIN_FUNCTION(run);
diff --git a/src/integritysetup/meson.build b/src/integritysetup/meson.build
new file mode 100644
index 0000000..6b9d78d
--- /dev/null
+++ b/src/integritysetup/meson.build
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+executables += [
+        libexec_template + {
+                'name' : 'systemd-integritysetup',
+                'conditions' : ['HAVE_LIBCRYPTSETUP'],
+                'sources' : files(
+                        'integrity-util.c',
+                        'integritysetup.c',
+                ),
+                'dependencies' : libcryptsetup,
+        },
+        generator_template + {
+                'name' : 'systemd-integritysetup-generator',
+                'conditions' : ['HAVE_LIBCRYPTSETUP'],
+                'sources' : files(
+                        'integrity-util.c',
+                        'integritysetup-generator.c',
+                ),
+        },
+]