1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
3 #include "errno-util.h"
4 #include "format-table.h"
6 #include "homectl-pkcs11.h"
7 #include "libcrypt-util.h"
8 #include "memory-util.h"
9 #include "openssl-util.h"
10 #include "pkcs11-util.h"
13 int identity_add_token_pin(JsonVariant
**v
, const char *pin
) {
14 _cleanup_(json_variant_unrefp
) JsonVariant
*w
= NULL
, *l
= NULL
;
15 _cleanup_strv_free_erase_
char **pins
= NULL
;
23 w
= json_variant_ref(json_variant_by_key(*v
, "secret"));
24 l
= json_variant_ref(json_variant_by_key(w
, "tokenPin"));
26 r
= json_variant_strv(l
, &pins
);
28 return log_error_errno(r
, "Failed to convert PIN array: %m");
30 if (strv_contains(pins
, pin
))
33 r
= strv_extend(&pins
, pin
);
39 l
= json_variant_unref(l
);
41 r
= json_variant_new_array_strv(&l
, pins
);
43 return log_error_errno(r
, "Failed to allocate new PIN array JSON: %m");
45 json_variant_sensitive(l
);
47 r
= json_variant_set_field(&w
, "tokenPin", l
);
49 return log_error_errno(r
, "Failed to update PIN field: %m");
51 r
= json_variant_set_field(v
, "secret", w
);
53 return log_error_errno(r
, "Failed to update secret object: %m");
60 static int add_pkcs11_token_uri(JsonVariant
**v
, const char *uri
) {
61 _cleanup_(json_variant_unrefp
) JsonVariant
*w
= NULL
;
62 _cleanup_strv_free_
char **l
= NULL
;
68 w
= json_variant_ref(json_variant_by_key(*v
, "pkcs11TokenUri"));
70 r
= json_variant_strv(w
, &l
);
72 return log_error_errno(r
, "Failed to parse PKCS#11 token list: %m");
74 if (strv_contains(l
, uri
))
78 r
= strv_extend(&l
, uri
);
82 w
= json_variant_unref(w
);
83 r
= json_variant_new_array_strv(&w
, l
);
85 return log_error_errno(r
, "Failed to create PKCS#11 token URI JSON: %m");
87 r
= json_variant_set_field(v
, "pkcs11TokenUri", w
);
89 return log_error_errno(r
, "Failed to update PKCS#11 token URI list: %m");
94 static int add_pkcs11_encrypted_key(
97 const void *encrypted_key
, size_t encrypted_key_size
,
98 const void *decrypted_key
, size_t decrypted_key_size
) {
100 _cleanup_(json_variant_unrefp
) JsonVariant
*l
= NULL
, *w
= NULL
, *e
= NULL
;
101 _cleanup_(erase_and_freep
) char *base64_encoded
= NULL
, *hashed
= NULL
;
102 ssize_t base64_encoded_size
;
107 assert(encrypted_key
);
108 assert(encrypted_key_size
> 0);
109 assert(decrypted_key
);
110 assert(decrypted_key_size
> 0);
112 /* Before using UNIX hashing on the supplied key we base64 encode it, since crypt_r() and friends
113 * expect a NUL terminated string, and we use a binary key */
114 base64_encoded_size
= base64mem(decrypted_key
, decrypted_key_size
, &base64_encoded
);
115 if (base64_encoded_size
< 0)
116 return log_error_errno(base64_encoded_size
, "Failed to base64 encode secret key: %m");
118 r
= hash_password(base64_encoded
, &hashed
);
120 return log_error_errno(errno_or_else(EINVAL
), "Failed to UNIX hash secret key: %m");
122 r
= json_build(&e
, JSON_BUILD_OBJECT(
123 JSON_BUILD_PAIR("uri", JSON_BUILD_STRING(uri
)),
124 JSON_BUILD_PAIR("data", JSON_BUILD_BASE64(encrypted_key
, encrypted_key_size
)),
125 JSON_BUILD_PAIR("hashedPassword", JSON_BUILD_STRING(hashed
))));
127 return log_error_errno(r
, "Failed to build encrypted JSON key object: %m");
129 w
= json_variant_ref(json_variant_by_key(*v
, "privileged"));
130 l
= json_variant_ref(json_variant_by_key(w
, "pkcs11EncryptedKey"));
132 r
= json_variant_append_array(&l
, e
);
134 return log_error_errno(r
, "Failed append PKCS#11 encrypted key: %m");
136 r
= json_variant_set_field(&w
, "pkcs11EncryptedKey", l
);
138 return log_error_errno(r
, "Failed to set PKCS#11 encrypted key: %m");
140 r
= json_variant_set_field(v
, "privileged", w
);
142 return log_error_errno(r
, "Failed to update privileged field: %m");
147 int identity_add_pkcs11_key_data(JsonVariant
**v
, const char *uri
) {
148 _cleanup_(erase_and_freep
) void *decrypted_key
= NULL
, *saved_key
= NULL
;
149 _cleanup_(erase_and_freep
) char *pin
= NULL
;
150 size_t decrypted_key_size
, saved_key_size
;
151 _cleanup_(EVP_PKEY_freep
) EVP_PKEY
*pkey
= NULL
;
156 r
= pkcs11_acquire_public_key(uri
, "home directory operation", "user-home", "home.token-pin", &pkey
, &pin
);
160 r
= pkey_generate_volume_keys(pkey
, &decrypted_key
, &decrypted_key_size
, &saved_key
, &saved_key_size
);
162 return log_error_errno(r
, "Failed to generate volume keys: %m");
164 /* Add the token URI to the public part of the record. */
165 r
= add_pkcs11_token_uri(v
, uri
);
169 /* Include the encrypted version of the random key we just generated in the privileged part of the record */
170 r
= add_pkcs11_encrypted_key(
173 saved_key
, saved_key_size
,
174 decrypted_key
, decrypted_key_size
);
178 /* If we acquired the PIN also include it in the secret section of the record, so that systemd-homed
179 * can use it if it needs to, given that it likely needs to decrypt the key again to pass to LUKS or
181 r
= identity_add_token_pin(v
, pin
);