29132483780

Committed 10 Jul 2026 08:43PM UTC coverage: 72.912% (+0.2%) from 72.702%

Build # 29132483780

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bluca

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man: run forgotten 'update-man-rules'

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58.79

/src/shared/cryptsetup-tpm2.c

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

#include "sd-json.h"

#include "alloc-util.h"
#include "ask-password-api.h"
#include "cryptsetup-tpm2.h"
#include "cryptsetup-util.h"
#include "env-util.h"
#include "fileio.h"
#include "hexdecoct.h"
#include "log.h"
#include "random-util.h"
#include "strv.h"
#include "tpm2-util.h"

#if HAVE_LIBCRYPTSETUP && HAVE_TPM2
static int get_pin(
                usec_t until,
                const char *askpw_credential,
                AskPasswordFlags askpw_flags,
                char **ret_pin_str) {
        _cleanup_(erase_and_freep) char *pin_str = NULL;
        _cleanup_strv_free_erase_ char **pin = NULL;
        int r;

        assert(ret_pin_str);

        r = getenv_steal_erase("PIN", &pin_str);
        if (r < 0)
                return log_error_errno(r, "Failed to acquire PIN from environment: %m");
        if (!r) {
                if (FLAGS_SET(askpw_flags, ASK_PASSWORD_HEADLESS))
                        return log_error_errno(
                                        SYNTHETIC_ERRNO(ENOPKG),
                                        "PIN querying disabled via 'headless' option. "
                                        "Use the '$PIN' environment variable.");

                AskPasswordRequest req = {
                        .tty_fd = -EBADF,
                        .message = "Please enter TPM2 PIN:",
                        .icon = "drive-harddisk",
                        .keyring = "tpm2-pin",
                        .credential = askpw_credential,
                        .until = until,
                        .hup_fd = -EBADF,
                };

                pin = strv_free_erase(pin);
                r = ask_password_auto(&req, askpw_flags, &pin);
                if (r < 0)
                        return log_error_errno(r, "Failed to ask for user pin: %m");
                assert(strv_length(pin) == 1);

                pin_str = strdup(pin[0]);
                if (!pin_str)
                        return log_oom();
        }

        *ret_pin_str = TAKE_PTR(pin_str);

        return r;
}
#endif

int acquire_tpm2_key(
                const char *volume_name,
                const char *device,
                uint32_t hash_pcr_mask,
                uint16_t pcr_bank,
                const struct iovec *pubkey,
                const char *pubkey_policy_ref,
                uint32_t pubkey_pcr_mask,
                const char *signature_path,
                const char *pcrlock_path,
                uint16_t primary_alg,
                const char *key_file,
                size_t key_file_size,
                uint64_t key_file_offset,
                const struct iovec blobs[],
                size_t n_blobs,
                const struct iovec policy_hash[],
                size_t n_policy_hash,
                const struct iovec *salt,
                const struct iovec *srk,
                const struct iovec *pcrlock_nv,
                TPM2Flags flags,
                usec_t until,
                const char *askpw_credential,
                AskPasswordFlags askpw_flags,
                struct iovec *ret_decrypted_key) {

#if HAVE_LIBCRYPTSETUP && HAVE_TPM2
        _cleanup_(sd_json_variant_unrefp) sd_json_variant *signature_json = NULL;
        _cleanup_(iovec_done) struct iovec loaded_blob = {};
        _cleanup_free_ char *auto_device = NULL;
        int r;

        assert(iovec_is_valid(salt));

        if (!device) {
                r = tpm2_find_device_auto(&auto_device);
                if (r == -ENODEV)
                        return -EAGAIN; /* Tell the caller to wait for a TPM2 device to show up */
                if (r < 0)
                        return log_error_errno(r, "Could not find TPM2 device: %m");

                device = auto_device;
        }

        if (n_blobs == 0) {
                _cleanup_free_ char *bindname = NULL;

                /* If we read the salt via AF_UNIX, make this client recognizable */
                if (asprintf(&bindname, "@%" PRIx64"/cryptsetup-tpm2/%s", random_u64(), volume_name) < 0)
                        return log_oom();

                r = read_full_file_full(
                                AT_FDCWD, key_file,
                                key_file_offset == 0 ? UINT64_MAX : key_file_offset,
                                key_file_size == 0 ? SIZE_MAX : key_file_size,
                                READ_FULL_FILE_CONNECT_SOCKET,
                                bindname,
                                (char**) &loaded_blob.iov_base, &loaded_blob.iov_len);
                if (r < 0)
                        return r;

                blobs = &loaded_blob;
                n_blobs = 1;
        }

        if (pubkey_pcr_mask != 0) {
                r = tpm2_load_pcr_signature(signature_path, &signature_json);
                if (r < 0)
                        return log_error_errno(r, "Failed to load pcr signature: %m");
        }

        _cleanup_(tpm2_pcrlock_policy_done) Tpm2PCRLockPolicy pcrlock_policy = {};

        if (FLAGS_SET(flags, TPM2_FLAGS_USE_PCRLOCK)) {
                r = tpm2_pcrlock_policy_load(pcrlock_path, &pcrlock_policy);
                if (r < 0)
                        return r;
                if (r == 0) {
                        /* Not found? Then search among passed credentials */
                        r = tpm2_pcrlock_policy_from_credentials(srk, pcrlock_nv, &pcrlock_policy);
                        if (r < 0)
                                return r;
                        if (r == 0)
                                return log_error_errno(SYNTHETIC_ERRNO(EREMOTE), "Couldn't find pcrlock policy for volume.");
                }
        }

        _cleanup_(tpm2_context_unrefp) Tpm2Context *tpm2_context = NULL;
        r = tpm2_context_new_or_warn(device, &tpm2_context);
        if (r < 0)
                return r;

        if (!(flags & TPM2_FLAGS_USE_PIN)) {
                r = tpm2_unseal(tpm2_context,
                                hash_pcr_mask,
                                pcr_bank,
                                pubkey,
                                pubkey_policy_ref,
                                pubkey_pcr_mask,
                                signature_json,
                                /* pin= */ NULL,
                                FLAGS_SET(flags, TPM2_FLAGS_USE_PCRLOCK) ? &pcrlock_policy : NULL,
                                primary_alg,
                                blobs,
                                n_blobs,
                                policy_hash,
                                n_policy_hash,
                                srk,
                                ret_decrypted_key);
                if (r == -EREMOTE)
                        return log_warning_errno(r, "TPM key integrity check failed. Key enrolled in superblock most likely does not belong to this TPM.");
                if (r == -EADDRNOTAVAIL)
                        return log_warning_errno(r, "NV index referenced by token is missing, unwritten, or unusable, it could be for another system.");
                if (ERRNO_IS_NEG_TPM2_UNSEAL_BAD_PCR(r)) {
                        log_warning_errno(r, "TPM policy does not match current system state. Either system has been tempered with or policy out-of-date: %m");
                        /* Normalize to -EPERM so callers don't confuse it with -ENOANO's "needs PIN" meaning. */
                        return -EPERM;
                }
                if (r == -ENOSTR)
                        return log_warning_errno(r, "No signature for current PCR policy in TPM2 signature JSON, token does not apply to current boot state: %m");
                if (r < 0)
                        return log_error_errno(r, "Failed to unseal secret using TPM2: %m");

                return r;
        }

        for (int i = 5;; i--) {
                _cleanup_(erase_and_freep) char *pin_str = NULL, *b64_salted_pin = NULL;

                if (i <= 0)
                        return -EACCES;

                r = get_pin(until, askpw_credential, askpw_flags, &pin_str);
                if (r < 0)
                        return r;

                askpw_flags &= ~ASK_PASSWORD_ACCEPT_CACHED;

                if (iovec_is_set(salt)) {
                        uint8_t salted_pin[SHA256_DIGEST_SIZE] = {};
                        CLEANUP_ERASE(salted_pin);

                        r = tpm2_util_pbkdf2_hmac_sha256(pin_str, strlen(pin_str), salt->iov_base, salt->iov_len, salted_pin);
                        if (r < 0)
                                return log_error_errno(r, "Failed to perform PBKDF2: %m");

                        r = base64mem(salted_pin, sizeof(salted_pin), &b64_salted_pin);
                        if (r < 0)
                                return log_error_errno(r, "Failed to base64 encode salted pin: %m");
                } else
                        /* no salting needed, backwards compat with non-salted pins */
                        b64_salted_pin = TAKE_PTR(pin_str);

                r = tpm2_unseal(tpm2_context,
                                hash_pcr_mask,
                                pcr_bank,
                                pubkey,
                                pubkey_policy_ref,
                                pubkey_pcr_mask,
                                signature_json,
                                b64_salted_pin,
                                FLAGS_SET(flags, TPM2_FLAGS_USE_PCRLOCK) ? &pcrlock_policy : NULL,
                                primary_alg,
                                blobs,
                                n_blobs,
                                policy_hash,
                                n_policy_hash,
                                srk,
                                ret_decrypted_key);
                if (r == -EREMOTE)
                        return log_warning_errno(r, "TPM key integrity check failed. Key enrolled in superblock most likely does not belong to this TPM.");
                if (r == -EADDRNOTAVAIL)
                        return log_warning_errno(r, "NV index referenced by token is missing, unwritten, or unusable, it could be for another system.");
                if (ERRNO_IS_NEG_TPM2_UNSEAL_BAD_PCR(r)) {
                        log_warning_errno(r, "TPM policy does not match current system state. Either system has been tempered with or policy out-of-date: %m");
                        /* Normalize to -EPERM so callers don't confuse it with -ENOANO's "needs PIN" meaning. */
                        return -EPERM;
                }
                if (r == -ENOSTR)
                        return log_warning_errno(r, "No signature for current PCR policy in TPM2 signature JSON, token does not apply to current boot state: %m");
                if (r == -ENOLCK)
                        return log_error_errno(r, "TPM is in dictionary attack lock-out mode.");
                if (r == -EILSEQ) {
                        log_warning_errno(r, "Bad PIN.");
                        continue;
                }
                if (r < 0)
                        return log_error_errno(r, "Failed to unseal secret using TPM2: %m");

                return r;
        }
#else
        return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "TPM2 support not available.");
#endif
}

int find_tpm2_auto_data(
                struct crypt_device *cd,
                uint32_t search_pcr_mask,
                int start_token,
                uint32_t *ret_hash_pcr_mask,
                uint16_t *ret_pcr_bank,
                struct iovec *ret_pubkey,
                char **ret_pubkey_policy_ref,
                uint32_t *ret_pubkey_pcr_mask,
                uint16_t *ret_primary_alg,
                struct iovec **ret_blobs,
                size_t *ret_n_blobs,
                struct iovec **ret_policy_hash,
                size_t *ret_n_policy_hash,
                struct iovec *ret_salt,
                struct iovec *ret_srk,
                struct iovec *ret_pcrlock_nv,
                TPM2Flags *ret_flags,
                int *ret_keyslot,
                int *ret_token) {

#if HAVE_LIBCRYPTSETUP && HAVE_TPM2
        int r, token;

        assert(cd);
        assert(ret_hash_pcr_mask);
        assert(ret_pcrlock_nv);
        assert(ret_pubkey);
        assert(ret_pubkey_policy_ref);
        assert(ret_pubkey_pcr_mask);
        assert(ret_primary_alg);
        assert(ret_blobs);
        assert(ret_n_blobs);
        assert(ret_policy_hash);
        assert(ret_n_policy_hash);
        assert(ret_salt);
        assert(ret_srk);
        assert(ret_pcrlock_nv);
        assert(ret_flags);
        assert(ret_keyslot);
        assert(ret_token);

        for (token = start_token; token < sym_crypt_token_max(CRYPT_LUKS2); token++) {
                _cleanup_(iovec_done) struct iovec pubkey = {}, salt = {}, srk = {}, pcrlock_nv = {};
                _cleanup_free_ char *pubkey_policy_ref = NULL;
                _cleanup_(sd_json_variant_unrefp) sd_json_variant *v = NULL;
                struct iovec *blobs = NULL, *policy_hash = NULL;
                size_t n_blobs = 0, n_policy_hash = 0;
                uint32_t hash_pcr_mask, pubkey_pcr_mask;
                uint16_t pcr_bank, primary_alg;
                TPM2Flags flags;
                int keyslot;

                CLEANUP_ARRAY(blobs, n_blobs, iovec_array_free);
                CLEANUP_ARRAY(policy_hash, n_policy_hash, iovec_array_free);

                r = cryptsetup_get_token_as_json(cd, token, "systemd-tpm2", &v);
                if (ERRNO_IS_NEG_CRYPTSETUP_TOKEN_SKIP(r))
                        continue;
                if (r < 0)
                        return log_error_errno(r, "Failed to read JSON token data off disk: %m");

                r = tpm2_parse_luks2_json(
                                v,
                                &keyslot,
                                &hash_pcr_mask,
                                &pcr_bank,
                                &pubkey,
                                &pubkey_policy_ref,
                                &pubkey_pcr_mask,
                                &primary_alg,
                                &blobs,
                                &n_blobs,
                                &policy_hash,
                                &n_policy_hash,
                                &salt,
                                &srk,
                                &pcrlock_nv,
                                &flags);
                if (r == -EUCLEAN) /* Gracefully handle issues in JSON fields not owned by us */
                        continue;
                if (r < 0)
                        return log_error_errno(r, "Failed to parse TPM2 JSON data: %m");

                if (search_pcr_mask == UINT32_MAX ||
                    search_pcr_mask == hash_pcr_mask) {

                        if (start_token <= 0)
                                log_info("Automatically discovered security TPM2 token unlocks volume.");

                        *ret_hash_pcr_mask = hash_pcr_mask;
                        *ret_pcr_bank = pcr_bank;
                        *ret_pubkey = TAKE_STRUCT(pubkey);
                        *ret_pubkey_policy_ref = TAKE_PTR(pubkey_policy_ref);
                        *ret_pubkey_pcr_mask = pubkey_pcr_mask;
                        *ret_primary_alg = primary_alg;
                        *ret_blobs = TAKE_PTR(blobs);
                        *ret_n_blobs = n_blobs;
                        *ret_policy_hash = TAKE_PTR(policy_hash);
                        *ret_n_policy_hash = n_policy_hash;
                        *ret_salt = TAKE_STRUCT(salt);
                        *ret_keyslot = keyslot;
                        *ret_token = token;
                        *ret_srk = TAKE_STRUCT(srk);
                        *ret_pcrlock_nv = TAKE_STRUCT(pcrlock_nv);
                        *ret_flags = flags;
                        return 0;
                }

                /* PCR mask doesn't match what is configured, ignore this entry, let's see next */
        }

        return log_error_errno(SYNTHETIC_ERRNO(ENXIO), "No valid TPM2 token data found.");
#else
        return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "TPM2 support not available.");
#endif
}

1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3	#include "sd-json.h"
4
5	#include "alloc-util.h"
6	#include "ask-password-api.h"
7	#include "cryptsetup-tpm2.h"
8	#include "cryptsetup-util.h"
9	#include "env-util.h"
10	#include "fileio.h"
11	#include "hexdecoct.h"
12	#include "log.h"
13	#include "random-util.h"
14	#include "strv.h"
15	#include "tpm2-util.h"
16
17	#if HAVE_LIBCRYPTSETUP && HAVE_TPM2
18	static int get_pin(	×
19	usec_t until,
20	const char *askpw_credential,
21	AskPasswordFlags askpw_flags,
22	char **ret_pin_str) {
23	_cleanup_(erase_and_freep) char *pin_str = NULL;	×
24	_cleanup_strv_free_erase_ char **pin = NULL;	×
25	int r;	×
26
27	assert(ret_pin_str);	×
28
29	r = getenv_steal_erase("PIN", &pin_str);	×
30	if (r < 0)	×
31	return log_error_errno(r, "Failed to acquire PIN from environment: %m");	×
32	if (!r) {	×
33	if (FLAGS_SET(askpw_flags, ASK_PASSWORD_HEADLESS))	×
34	return log_error_errno(	×
35	SYNTHETIC_ERRNO(ENOPKG),
36	"PIN querying disabled via 'headless' option. "
37	"Use the '$PIN' environment variable.");
38
39	AskPasswordRequest req = {	×
40	.tty_fd = -EBADF,
41	.message = "Please enter TPM2 PIN:",
42	.icon = "drive-harddisk",
43	.keyring = "tpm2-pin",
44	.credential = askpw_credential,
45	.until = until,
46	.hup_fd = -EBADF,
47	};
48
49	pin = strv_free_erase(pin);	×
50	r = ask_password_auto(&req, askpw_flags, &pin);	×
51	if (r < 0)	×
52	return log_error_errno(r, "Failed to ask for user pin: %m");	×
53	assert(strv_length(pin) == 1);	×
54
55	pin_str = strdup(pin[0]);	×
56	if (!pin_str)	×
57	return log_oom();	×
58	}
59
60	*ret_pin_str = TAKE_PTR(pin_str);	×
61
62	return r;	×
63	}
64	#endif
65
66	int acquire_tpm2_key(	12✔
67	const char *volume_name,
68	const char *device,
69	uint32_t hash_pcr_mask,
70	uint16_t pcr_bank,
71	const struct iovec *pubkey,
72	const char *pubkey_policy_ref,
73	uint32_t pubkey_pcr_mask,
74	const char *signature_path,
75	const char *pcrlock_path,
76	uint16_t primary_alg,
77	const char *key_file,
78	size_t key_file_size,
79	uint64_t key_file_offset,
80	const struct iovec blobs[],
81	size_t n_blobs,
82	const struct iovec policy_hash[],
83	size_t n_policy_hash,
84	const struct iovec *salt,
85	const struct iovec *srk,
86	const struct iovec *pcrlock_nv,
87	TPM2Flags flags,
88	usec_t until,
89	const char *askpw_credential,
90	AskPasswordFlags askpw_flags,
91	struct iovec *ret_decrypted_key) {
92
93	#if HAVE_LIBCRYPTSETUP && HAVE_TPM2
94	_cleanup_(sd_json_variant_unrefp) sd_json_variant *signature_json = NULL;	12✔
95	_cleanup_(iovec_done) struct iovec loaded_blob = {};	12✔
96	_cleanup_free_ char *auto_device = NULL;	12✔
97	int r;	12✔
98
99	assert(iovec_is_valid(salt));	12✔
100
101	if (!device) {	12✔
102	r = tpm2_find_device_auto(&auto_device);	12✔
103	if (r == -ENODEV)	12✔
104	return -EAGAIN; /* Tell the caller to wait for a TPM2 device to show up */
105	if (r < 0)	12✔
106	return log_error_errno(r, "Could not find TPM2 device: %m");	×
107
108	device = auto_device;	12✔
109	}
110
111	if (n_blobs == 0) {	12✔
112	_cleanup_free_ char *bindname = NULL;	2✔
113
114	/* If we read the salt via AF_UNIX, make this client recognizable */
115	if (asprintf(&bindname, "@%" PRIx64"/cryptsetup-tpm2/%s", random_u64(), volume_name) < 0)	2✔
116	return log_oom();	×
117
118	r = read_full_file_full(	6✔
119	AT_FDCWD, key_file,
120	key_file_offset == 0 ? UINT64_MAX : key_file_offset,
121	key_file_size == 0 ? SIZE_MAX : key_file_size,
122	READ_FULL_FILE_CONNECT_SOCKET,
123	bindname,
124	(char**) &loaded_blob.iov_base, &loaded_blob.iov_len);
125	if (r < 0)	2✔
126	return r;
127
128	blobs = &loaded_blob;	2✔
129	n_blobs = 1;	2✔
130	}
131
132	if (pubkey_pcr_mask != 0) {	12✔
133	r = tpm2_load_pcr_signature(signature_path, &signature_json);	3✔
134	if (r < 0)	3✔
135	return log_error_errno(r, "Failed to load pcr signature: %m");	×
136	}
137
138	_cleanup_(tpm2_pcrlock_policy_done) Tpm2PCRLockPolicy pcrlock_policy = {};	12✔
139
140	if (FLAGS_SET(flags, TPM2_FLAGS_USE_PCRLOCK)) {	12✔
141	r = tpm2_pcrlock_policy_load(pcrlock_path, &pcrlock_policy);	2✔
142	if (r < 0)	2✔
143	return r;
144	if (r == 0) {	2✔
145	/* Not found? Then search among passed credentials */
146	r = tpm2_pcrlock_policy_from_credentials(srk, pcrlock_nv, &pcrlock_policy);	×
147	if (r < 0)	×
148	return r;
149	if (r == 0)	×
150	return log_error_errno(SYNTHETIC_ERRNO(EREMOTE), "Couldn't find pcrlock policy for volume.");	×
151	}
152	}
153
154	_cleanup_(tpm2_context_unrefp) Tpm2Context *tpm2_context = NULL;	×
155	r = tpm2_context_new_or_warn(device, &tpm2_context);	12✔
156	if (r < 0)	12✔
157	return r;
158
159	if (!(flags & TPM2_FLAGS_USE_PIN)) {	12✔
160	r = tpm2_unseal(tpm2_context,	22✔
161	hash_pcr_mask,
162	pcr_bank,
163	pubkey,
164	pubkey_policy_ref,
165	pubkey_pcr_mask,
166	signature_json,
167	/* pin= */ NULL,
168	FLAGS_SET(flags, TPM2_FLAGS_USE_PCRLOCK) ? &pcrlock_policy : NULL,
169	primary_alg,
170	blobs,
171	n_blobs,
172	policy_hash,
173	n_policy_hash,
174	srk,
175	ret_decrypted_key);
176	if (r == -EREMOTE)	12✔
177	return log_warning_errno(r, "TPM key integrity check failed. Key enrolled in superblock most likely does not belong to this TPM.");	1✔
178	if (r == -EADDRNOTAVAIL)	11✔
179	return log_warning_errno(r, "NV index referenced by token is missing, unwritten, or unusable, it could be for another system.");	×
180	if (ERRNO_IS_NEG_TPM2_UNSEAL_BAD_PCR(r)) {	11✔
181	log_warning_errno(r, "TPM policy does not match current system state. Either system has been tempered with or policy out-of-date: %m");	12✔
182	/* Normalize to -EPERM so callers don't confuse it with -ENOANO's "needs PIN" meaning. */
183	return -EPERM;
184	}
185	if (r == -ENOSTR)	11✔
186	return log_warning_errno(r, "No signature for current PCR policy in TPM2 signature JSON, token does not apply to current boot state: %m");	1✔
187	if (r < 0)	10✔
188	return log_error_errno(r, "Failed to unseal secret using TPM2: %m");	2✔
189
190	return r;
191	}
192
193	for (int i = 5;; i--) {	×
194	_cleanup_(erase_and_freep) char pin_str = NULL, b64_salted_pin = NULL;	×
195
196	if (i <= 0)	×
197	return -EACCES;
198
199	r = get_pin(until, askpw_credential, askpw_flags, &pin_str);	×
200	if (r < 0)	×
201	return r;
202
203	askpw_flags &= ~ASK_PASSWORD_ACCEPT_CACHED;	×
204
205	if (iovec_is_set(salt)) {	×
206	uint8_t salted_pin[SHA256_DIGEST_SIZE] = {};	×
207	CLEANUP_ERASE(salted_pin);	×
208
209	r = tpm2_util_pbkdf2_hmac_sha256(pin_str, strlen(pin_str), salt->iov_base, salt->iov_len, salted_pin);	×
210	if (r < 0)	×
211	return log_error_errno(r, "Failed to perform PBKDF2: %m");	×
212
213	r = base64mem(salted_pin, sizeof(salted_pin), &b64_salted_pin);	×
214	if (r < 0)	×
215	return log_error_errno(r, "Failed to base64 encode salted pin: %m");	×
216	} else
217	/* no salting needed, backwards compat with non-salted pins */
218	b64_salted_pin = TAKE_PTR(pin_str);	×
219
220	r = tpm2_unseal(tpm2_context,	×
221	hash_pcr_mask,
222	pcr_bank,
223	pubkey,
224	pubkey_policy_ref,
225	pubkey_pcr_mask,
226	signature_json,
227	b64_salted_pin,
228	FLAGS_SET(flags, TPM2_FLAGS_USE_PCRLOCK) ? &pcrlock_policy : NULL,
229	primary_alg,
230	blobs,
231	n_blobs,
232	policy_hash,
233	n_policy_hash,
234	srk,
235	ret_decrypted_key);
236	if (r == -EREMOTE)	×
237	return log_warning_errno(r, "TPM key integrity check failed. Key enrolled in superblock most likely does not belong to this TPM.");	×
238	if (r == -EADDRNOTAVAIL)	×
239	return log_warning_errno(r, "NV index referenced by token is missing, unwritten, or unusable, it could be for another system.");	×
240	if (ERRNO_IS_NEG_TPM2_UNSEAL_BAD_PCR(r)) {	×
241	log_warning_errno(r, "TPM policy does not match current system state. Either system has been tempered with or policy out-of-date: %m");	×
242	/* Normalize to -EPERM so callers don't confuse it with -ENOANO's "needs PIN" meaning. */
243	return -EPERM;
244	}
245	if (r == -ENOSTR)	×
246	return log_warning_errno(r, "No signature for current PCR policy in TPM2 signature JSON, token does not apply to current boot state: %m");	×
247	if (r == -ENOLCK)	×
248	return log_error_errno(r, "TPM is in dictionary attack lock-out mode.");	×
249	if (r == -EILSEQ) {	×
250	log_warning_errno(r, "Bad PIN.");	×
251	continue;	×
252	}
253	if (r < 0)	×
254	return log_error_errno(r, "Failed to unseal secret using TPM2: %m");	×
255
256	return r;
257	}
258	#else
259	return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "TPM2 support not available.");
260	#endif
261	}
262
263	int find_tpm2_auto_data(	10✔
264	struct crypt_device *cd,
265	uint32_t search_pcr_mask,
266	int start_token,
267	uint32_t *ret_hash_pcr_mask,
268	uint16_t *ret_pcr_bank,
269	struct iovec *ret_pubkey,
270	char **ret_pubkey_policy_ref,
271	uint32_t *ret_pubkey_pcr_mask,
272	uint16_t *ret_primary_alg,
273	struct iovec **ret_blobs,
274	size_t *ret_n_blobs,
275	struct iovec **ret_policy_hash,
276	size_t *ret_n_policy_hash,
277	struct iovec *ret_salt,
278	struct iovec *ret_srk,
279	struct iovec *ret_pcrlock_nv,
280	TPM2Flags *ret_flags,
281	int *ret_keyslot,
282	int *ret_token) {
283
284	#if HAVE_LIBCRYPTSETUP && HAVE_TPM2
285	int r, token;	10✔
286
287	assert(cd);	10✔
288	assert(ret_hash_pcr_mask);	10✔
289	assert(ret_pcrlock_nv);	10✔
290	assert(ret_pubkey);	10✔
291	assert(ret_pubkey_policy_ref);	10✔
292	assert(ret_pubkey_pcr_mask);	10✔
293	assert(ret_primary_alg);	10✔
294	assert(ret_blobs);	10✔
295	assert(ret_n_blobs);	10✔
296	assert(ret_policy_hash);	10✔
297	assert(ret_n_policy_hash);	10✔
298	assert(ret_salt);	10✔
299	assert(ret_srk);	10✔
300	assert(ret_pcrlock_nv);	10✔
301	assert(ret_flags);	10✔
302	assert(ret_keyslot);	10✔
303	assert(ret_token);	10✔
304
305	for (token = start_token; token < sym_crypt_token_max(CRYPT_LUKS2); token++) {	16✔
306	_cleanup_(iovec_done) struct iovec pubkey = {}, salt = {}, srk = {}, pcrlock_nv = {};	16✔
307	_cleanup_free_ char *pubkey_policy_ref = NULL;	16✔
308	_cleanup_(sd_json_variant_unrefp) sd_json_variant *v = NULL;	16✔
309	struct iovec blobs = NULL, policy_hash = NULL;	16✔
310	size_t n_blobs = 0, n_policy_hash = 0;	16✔
311	uint32_t hash_pcr_mask, pubkey_pcr_mask;	16✔
312	uint16_t pcr_bank, primary_alg;	16✔
313	TPM2Flags flags;	16✔
314	int keyslot;	16✔
315
316	CLEANUP_ARRAY(blobs, n_blobs, iovec_array_free);	16✔
317	CLEANUP_ARRAY(policy_hash, n_policy_hash, iovec_array_free);	16✔
318
319	r = cryptsetup_get_token_as_json(cd, token, "systemd-tpm2", &v);	16✔
320	if (ERRNO_IS_NEG_CRYPTSETUP_TOKEN_SKIP(r))	16✔
321	continue;	6✔
322	if (r < 0)	10✔
323	return log_error_errno(r, "Failed to read JSON token data off disk: %m");	×
324
325	r = tpm2_parse_luks2_json(	10✔
326	v,
327	&keyslot,
328	&hash_pcr_mask,
329	&pcr_bank,
330	&pubkey,
331	&pubkey_policy_ref,
332	&pubkey_pcr_mask,
333	&primary_alg,
334	&blobs,
335	&n_blobs,
336	&policy_hash,
337	&n_policy_hash,
338	&salt,
339	&srk,
340	&pcrlock_nv,
341	&flags);
342	if (r == -EUCLEAN) /* Gracefully handle issues in JSON fields not owned by us */	10✔
343	continue;	×
344	if (r < 0)	10✔
345	return log_error_errno(r, "Failed to parse TPM2 JSON data: %m");	×
346
347	if (search_pcr_mask == UINT32_MAX \|\|	10✔
348	search_pcr_mask == hash_pcr_mask) {	×
349
350	if (start_token <= 0)	10✔
351	log_info("Automatically discovered security TPM2 token unlocks volume.");	8✔
352
353	*ret_hash_pcr_mask = hash_pcr_mask;	10✔
354	*ret_pcr_bank = pcr_bank;	10✔
355	*ret_pubkey = TAKE_STRUCT(pubkey);	10✔
356	*ret_pubkey_policy_ref = TAKE_PTR(pubkey_policy_ref);	10✔
357	*ret_pubkey_pcr_mask = pubkey_pcr_mask;	10✔
358	*ret_primary_alg = primary_alg;	10✔
359	*ret_blobs = TAKE_PTR(blobs);	10✔
360	*ret_n_blobs = n_blobs;	10✔
361	*ret_policy_hash = TAKE_PTR(policy_hash);	10✔
362	*ret_n_policy_hash = n_policy_hash;	10✔
363	*ret_salt = TAKE_STRUCT(salt);	10✔
364	*ret_keyslot = keyslot;	10✔
365	*ret_token = token;	10✔
366	*ret_srk = TAKE_STRUCT(srk);	10✔
367	*ret_pcrlock_nv = TAKE_STRUCT(pcrlock_nv);	10✔
368	*ret_flags = flags;	10✔
369	return 0;	10✔
370	}
371
372	/* PCR mask doesn't match what is configured, ignore this entry, let's see next */
373	}
374
375	return log_error_errno(SYNTHETIC_ERRNO(ENXIO), "No valid TPM2 token data found.");	×
376	#else
377	return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "TPM2 support not available.");
378	#endif
379	}

systemd / systemd / 29132483780

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