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Systemd/src/shared/libfido2-util.c

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "libfido2-util.h"
#if HAVE_LIBFIDO2
#include "alloc-util.h"
#include "ask-password-api.h"
#include "dlfcn-util.h"
#include "format-table.h"
#include "locale-util.h"
#include "log.h"
#include "memory-util.h"
#include "random-util.h"
#include "strv.h"
static void *libfido2_dl = NULL;
int (*sym_fido_assert_allow_cred)(fido_assert_t *, const unsigned char *, size_t) = NULL;
void (*sym_fido_assert_free)(fido_assert_t **) = NULL;
size_t (*sym_fido_assert_hmac_secret_len)(const fido_assert_t *, size_t) = NULL;
const unsigned char* (*sym_fido_assert_hmac_secret_ptr)(const fido_assert_t *, size_t) = NULL;
fido_assert_t* (*sym_fido_assert_new)(void) = NULL;
int (*sym_fido_assert_set_clientdata_hash)(fido_assert_t *, const unsigned char *, size_t) = NULL;
int (*sym_fido_assert_set_extensions)(fido_assert_t *, int) = NULL;
int (*sym_fido_assert_set_hmac_salt)(fido_assert_t *, const unsigned char *, size_t) = NULL;
int (*sym_fido_assert_set_rp)(fido_assert_t *, const char *) = NULL;
int (*sym_fido_assert_set_up)(fido_assert_t *, fido_opt_t) = NULL;
size_t (*sym_fido_cbor_info_extensions_len)(const fido_cbor_info_t *) = NULL;
char **(*sym_fido_cbor_info_extensions_ptr)(const fido_cbor_info_t *) = NULL;
void (*sym_fido_cbor_info_free)(fido_cbor_info_t **) = NULL;
fido_cbor_info_t* (*sym_fido_cbor_info_new)(void) = NULL;
void (*sym_fido_cred_free)(fido_cred_t **) = NULL;
size_t (*sym_fido_cred_id_len)(const fido_cred_t *) = NULL;
const unsigned char* (*sym_fido_cred_id_ptr)(const fido_cred_t *) = NULL;
fido_cred_t* (*sym_fido_cred_new)(void) = NULL;
int (*sym_fido_cred_set_clientdata_hash)(fido_cred_t *, const unsigned char *, size_t) = NULL;
int (*sym_fido_cred_set_extensions)(fido_cred_t *, int) = NULL;
int (*sym_fido_cred_set_rk)(fido_cred_t *, fido_opt_t) = NULL;
int (*sym_fido_cred_set_rp)(fido_cred_t *, const char *, const char *) = NULL;
int (*sym_fido_cred_set_type)(fido_cred_t *, int) = NULL;
int (*sym_fido_cred_set_user)(fido_cred_t *, const unsigned char *, size_t, const char *, const char *, const char *) = NULL;
int (*sym_fido_cred_set_uv)(fido_cred_t *, fido_opt_t) = NULL;
void (*sym_fido_dev_free)(fido_dev_t **) = NULL;
int (*sym_fido_dev_get_assert)(fido_dev_t *, fido_assert_t *, const char *) = NULL;
int (*sym_fido_dev_get_cbor_info)(fido_dev_t *, fido_cbor_info_t *) = NULL;
void (*sym_fido_dev_info_free)(fido_dev_info_t **, size_t) = NULL;
int (*sym_fido_dev_info_manifest)(fido_dev_info_t *, size_t, size_t *) = NULL;
const char* (*sym_fido_dev_info_manufacturer_string)(const fido_dev_info_t *) = NULL;
const char* (*sym_fido_dev_info_product_string)(const fido_dev_info_t *) = NULL;
fido_dev_info_t* (*sym_fido_dev_info_new)(size_t) = NULL;
const char* (*sym_fido_dev_info_path)(const fido_dev_info_t *) = NULL;
const fido_dev_info_t* (*sym_fido_dev_info_ptr)(const fido_dev_info_t *, size_t) = NULL;
bool (*sym_fido_dev_is_fido2)(const fido_dev_t *) = NULL;
int (*sym_fido_dev_make_cred)(fido_dev_t *, fido_cred_t *, const char *) = NULL;
fido_dev_t* (*sym_fido_dev_new)(void) = NULL;
int (*sym_fido_dev_open)(fido_dev_t *, const char *) = NULL;
const char* (*sym_fido_strerr)(int) = NULL;
int dlopen_libfido2(void) {
_cleanup_(dlclosep) void *dl = NULL;
int r;
if (libfido2_dl)
return 0; /* Already loaded */
dl = dlopen("libfido2.so.1", RTLD_LAZY);
if (!dl)
return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"libfido2 support is not installed: %s", dlerror());
r = dlsym_many_and_warn(
dl,
LOG_DEBUG,
DLSYM_ARG(fido_assert_allow_cred),
DLSYM_ARG(fido_assert_free),
DLSYM_ARG(fido_assert_hmac_secret_len),
DLSYM_ARG(fido_assert_hmac_secret_ptr),
DLSYM_ARG(fido_assert_new),
DLSYM_ARG(fido_assert_set_clientdata_hash),
DLSYM_ARG(fido_assert_set_extensions),
DLSYM_ARG(fido_assert_set_hmac_salt),
DLSYM_ARG(fido_assert_set_rp),
DLSYM_ARG(fido_assert_set_up),
DLSYM_ARG(fido_cbor_info_extensions_len),
DLSYM_ARG(fido_cbor_info_extensions_ptr),
DLSYM_ARG(fido_cbor_info_free),
DLSYM_ARG(fido_cbor_info_new),
DLSYM_ARG(fido_cred_free),
DLSYM_ARG(fido_cred_id_len),
DLSYM_ARG(fido_cred_id_ptr),
DLSYM_ARG(fido_cred_new),
DLSYM_ARG(fido_cred_set_clientdata_hash),
DLSYM_ARG(fido_cred_set_extensions),
DLSYM_ARG(fido_cred_set_rk),
DLSYM_ARG(fido_cred_set_rp),
DLSYM_ARG(fido_cred_set_type),
DLSYM_ARG(fido_cred_set_user),
DLSYM_ARG(fido_cred_set_uv),
DLSYM_ARG(fido_dev_free),
DLSYM_ARG(fido_dev_get_assert),
DLSYM_ARG(fido_dev_get_cbor_info),
DLSYM_ARG(fido_dev_info_free),
DLSYM_ARG(fido_dev_info_manifest),
DLSYM_ARG(fido_dev_info_manufacturer_string),
DLSYM_ARG(fido_dev_info_new),
DLSYM_ARG(fido_dev_info_path),
DLSYM_ARG(fido_dev_info_product_string),
DLSYM_ARG(fido_dev_info_ptr),
DLSYM_ARG(fido_dev_is_fido2),
DLSYM_ARG(fido_dev_make_cred),
DLSYM_ARG(fido_dev_new),
DLSYM_ARG(fido_dev_open),
DLSYM_ARG(fido_strerr),
NULL);
if (r < 0)
return r;
/* Note that we never release the reference here, because there's no real reason to, after all this
* was traditionally a regular shared library dependency which lives forever too. */
libfido2_dl = TAKE_PTR(dl);
return 1;
}
static int fido2_use_hmac_hash_specific_token(
const char *path,
const char *rp_id,
const void *salt,
size_t salt_size,
const void *cid,
size_t cid_size,
char **pins,
bool up, /* user presence permitted */
void **ret_hmac,
size_t *ret_hmac_size) {
_cleanup_(fido_cbor_info_free_wrapper) fido_cbor_info_t *di = NULL;
_cleanup_(fido_assert_free_wrapper) fido_assert_t *a = NULL;
_cleanup_(fido_dev_free_wrapper) fido_dev_t *d = NULL;
_cleanup_(erase_and_freep) void *hmac_copy = NULL;
bool found_extension = false;
size_t n, hmac_size;
const void *hmac;
char **e;
int r;
assert(path);
assert(rp_id);
assert(salt);
assert(cid);
assert(ret_hmac);
assert(ret_hmac_size);
d = sym_fido_dev_new();
if (!d)
return log_oom();
r = sym_fido_dev_open(d, path);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to open FIDO2 device %s: %s", path, sym_fido_strerr(r));
if (!sym_fido_dev_is_fido2(d))
return log_error_errno(SYNTHETIC_ERRNO(ENODEV),
"Specified device %s is not a FIDO2 device.", path);
di = sym_fido_cbor_info_new();
if (!di)
return log_oom();
r = sym_fido_dev_get_cbor_info(d, di);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to get CBOR device info for %s: %s", path, sym_fido_strerr(r));
e = sym_fido_cbor_info_extensions_ptr(di);
n = sym_fido_cbor_info_extensions_len(di);
for (size_t i = 0; i < n; i++)
if (streq(e[i], "hmac-secret")) {
found_extension = true;
break;
}
if (!found_extension)
return log_error_errno(SYNTHETIC_ERRNO(ENODEV),
"Specified device %s is a FIDO2 device, but does not support the required HMAC-SECRET extension.", path);
a = sym_fido_assert_new();
if (!a)
return log_oom();
r = sym_fido_assert_set_extensions(a, FIDO_EXT_HMAC_SECRET);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to enable HMAC-SECRET extension on FIDO2 assertion: %s", sym_fido_strerr(r));
r = sym_fido_assert_set_hmac_salt(a, salt, salt_size);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to set salt on FIDO2 assertion: %s", sym_fido_strerr(r));
r = sym_fido_assert_set_rp(a, rp_id);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to set FIDO2 assertion ID: %s", sym_fido_strerr(r));
r = sym_fido_assert_set_clientdata_hash(a, (const unsigned char[32]) {}, 32);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to set FIDO2 assertion client data hash: %s", sym_fido_strerr(r));
r = sym_fido_assert_allow_cred(a, cid, cid_size);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to add FIDO2 assertion credential ID: %s", sym_fido_strerr(r));
r = sym_fido_assert_set_up(a, FIDO_OPT_FALSE);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to set FIDO2 assertion user presence: %s", sym_fido_strerr(r));
log_info("Asking FIDO2 token for authentication.");
r = sym_fido_dev_get_assert(d, a, NULL); /* try without pin and without up first */
if (r == FIDO_ERR_UP_REQUIRED && up) {
r = sym_fido_assert_set_up(a, FIDO_OPT_TRUE);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to set FIDO2 assertion user presence: %s", sym_fido_strerr(r));
log_info("Security token requires user presence.");
r = sym_fido_dev_get_assert(d, a, NULL); /* try without pin but with up now */
}
if (r == FIDO_ERR_PIN_REQUIRED) {
char **i;
/* OK, we needed a pin, try with all pins in turn */
STRV_FOREACH(i, pins) {
r = sym_fido_dev_get_assert(d, a, *i);
if (r != FIDO_ERR_PIN_INVALID)
break;
}
}
switch (r) {
case FIDO_OK:
break;
case FIDO_ERR_NO_CREDENTIALS:
return log_error_errno(SYNTHETIC_ERRNO(EBADSLT),
"Wrong security token; needed credentials not present on token.");
case FIDO_ERR_PIN_REQUIRED:
return log_error_errno(SYNTHETIC_ERRNO(ENOANO),
"Security token requires PIN.");
case FIDO_ERR_PIN_AUTH_BLOCKED:
return log_error_errno(SYNTHETIC_ERRNO(EOWNERDEAD),
"PIN of security token is blocked, please remove/reinsert token.");
case FIDO_ERR_PIN_INVALID:
return log_error_errno(SYNTHETIC_ERRNO(ENOLCK),
"PIN of security token incorrect.");
case FIDO_ERR_UP_REQUIRED:
return log_error_errno(SYNTHETIC_ERRNO(EMEDIUMTYPE),
"User presence required.");
case FIDO_ERR_ACTION_TIMEOUT:
return log_error_errno(SYNTHETIC_ERRNO(ENOSTR),
"Token action timeout. (User didn't interact with token quickly enough.)");
default:
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to ask token for assertion: %s", sym_fido_strerr(r));
}
hmac = sym_fido_assert_hmac_secret_ptr(a, 0);
if (!hmac)
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to retrieve HMAC secret.");
hmac_size = sym_fido_assert_hmac_secret_len(a, 0);
hmac_copy = memdup(hmac, hmac_size);
if (!hmac_copy)
return log_oom();
*ret_hmac = TAKE_PTR(hmac_copy);
*ret_hmac_size = hmac_size;
return 0;
}
int fido2_use_hmac_hash(
const char *device,
const char *rp_id,
const void *salt,
size_t salt_size,
const void *cid,
size_t cid_size,
char **pins,
bool up, /* user presence permitted */
void **ret_hmac,
size_t *ret_hmac_size) {
size_t allocated = 64, found = 0;
fido_dev_info_t *di = NULL;
int r;
r = dlopen_libfido2();
if (r < 0)
return log_error_errno(r, "FIDO2 support is not installed.");
if (device)
return fido2_use_hmac_hash_specific_token(device, rp_id, salt, salt_size, cid, cid_size, pins, up, ret_hmac, ret_hmac_size);
di = sym_fido_dev_info_new(allocated);
if (!di)
return log_oom();
r = sym_fido_dev_info_manifest(di, allocated, &found);
if (r == FIDO_ERR_INTERNAL) {
/* The library returns FIDO_ERR_INTERNAL when no devices are found. I wish it wouldn't. */
r = log_debug_errno(SYNTHETIC_ERRNO(EAGAIN), "Got FIDO_ERR_INTERNAL, assuming no devices.");
goto finish;
}
if (r != FIDO_OK) {
r = log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to enumerate FIDO2 devices: %s", sym_fido_strerr(r));
goto finish;
}
for (size_t i = 0; i < found; i++) {
const fido_dev_info_t *entry;
const char *path;
entry = sym_fido_dev_info_ptr(di, i);
if (!entry) {
r = log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to get device information for FIDO device %zu.", i);
goto finish;
}
path = sym_fido_dev_info_path(entry);
if (!path) {
r = log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to query FIDO device path.");
goto finish;
}
r = fido2_use_hmac_hash_specific_token(path, rp_id, salt, salt_size, cid, cid_size, pins, up, ret_hmac, ret_hmac_size);
if (!IN_SET(r,
-EBADSLT, /* device doesn't understand our credential hash */
-ENODEV /* device is not a FIDO2 device with HMAC-SECRET */))
goto finish;
}
r = -EAGAIN;
finish:
sym_fido_dev_info_free(&di, allocated);
return r;
}
#define FIDO2_SALT_SIZE 32
int fido2_generate_hmac_hash(
const char *device,
const char *rp_id,
const char *rp_name,
const void *user_id, size_t user_id_len,
const char *user_name,
const char *user_display_name,
const char *user_icon,
const char *askpw_icon_name,
void **ret_cid, size_t *ret_cid_size,
void **ret_salt, size_t *ret_salt_size,
void **ret_secret, size_t *ret_secret_size,
char **ret_usedpin) {
_cleanup_(fido_cbor_info_free_wrapper) fido_cbor_info_t *di = NULL;
_cleanup_(erase_and_freep) void *salt = NULL, *secret_copy = NULL;
_cleanup_(fido_assert_free_wrapper) fido_assert_t *a = NULL;
_cleanup_(fido_cred_free_wrapper) fido_cred_t *c = NULL;
_cleanup_(fido_dev_free_wrapper) fido_dev_t *d = NULL;
_cleanup_(erase_and_freep) char *used_pin = NULL;
_cleanup_free_ char *cid_copy = NULL;
size_t n, cid_size, secret_size;
bool found_extension = false;
const void *cid, *secret;
char **e;
int r;
assert(device);
assert(ret_cid);
assert(ret_cid_size);
assert(ret_salt);
assert(ret_salt_size);
assert(ret_secret);
assert(ret_secret_size);
/* Construction is like this: we generate a salt of 32 bytes. We then ask the FIDO2 device to
* HMAC-SHA256 it for us with its internal key. The result is the key used by LUKS and account
* authentication. LUKS and UNIX password auth all do their own salting before hashing, so that FIDO2
* device never sees the volume key.
*
* S = HMAC-SHA256(I, D)
*
* with: S → LUKS/account authentication key (never stored)
* I → internal key on FIDO2 device (stored in the FIDO2 device)
* D → salt we generate here (stored in the privileged part of the JSON record)
*
*/
assert(device);
r = dlopen_libfido2();
if (r < 0)
return log_error_errno(r, "FIDO2 token support is not installed.");
salt = malloc(FIDO2_SALT_SIZE);
if (!salt)
return log_oom();
r = genuine_random_bytes(salt, FIDO2_SALT_SIZE, RANDOM_BLOCK);
if (r < 0)
return log_error_errno(r, "Failed to generate salt: %m");
d = sym_fido_dev_new();
if (!d)
return log_oom();
r = sym_fido_dev_open(d, device);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to open FIDO2 device %s: %s", device, sym_fido_strerr(r));
if (!sym_fido_dev_is_fido2(d))
return log_error_errno(SYNTHETIC_ERRNO(ENODEV),
"Specified device %s is not a FIDO2 device.", device);
di = sym_fido_cbor_info_new();
if (!di)
return log_oom();
r = sym_fido_dev_get_cbor_info(d, di);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to get CBOR device info for %s: %s", device, sym_fido_strerr(r));
e = sym_fido_cbor_info_extensions_ptr(di);
n = sym_fido_cbor_info_extensions_len(di);
for (size_t i = 0; i < n; i++)
if (streq(e[i], "hmac-secret")) {
found_extension = true;
break;
}
if (!found_extension)
return log_error_errno(SYNTHETIC_ERRNO(ENODEV),
"Specified device %s is a FIDO2 device, but does not support the required HMAC-SECRET extension.", device);
c = sym_fido_cred_new();
if (!c)
return log_oom();
r = sym_fido_cred_set_extensions(c, FIDO_EXT_HMAC_SECRET);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to enable HMAC-SECRET extension on FIDO2 credential: %s", sym_fido_strerr(r));
r = sym_fido_cred_set_rp(c, rp_id, rp_name);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to set FIDO2 credential relying party ID/name: %s", sym_fido_strerr(r));
r = sym_fido_cred_set_type(c, COSE_ES256);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to set FIDO2 credential type to ES256: %s", sym_fido_strerr(r));
r = sym_fido_cred_set_user(
c,
user_id, user_id_len,
user_name,
user_display_name,
user_icon);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to set FIDO2 credential user data: %s", sym_fido_strerr(r));
r = sym_fido_cred_set_clientdata_hash(c, (const unsigned char[32]) {}, 32);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to set FIDO2 client data hash: %s", sym_fido_strerr(r));
r = sym_fido_cred_set_rk(c, FIDO_OPT_FALSE);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to turn off FIDO2 resident key option of credential: %s", sym_fido_strerr(r));
r = sym_fido_cred_set_uv(c, FIDO_OPT_FALSE);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to turn off FIDO2 user verification option of credential: %s", sym_fido_strerr(r));
log_info("Initializing FIDO2 credential on security token.");
log_notice("%s%s(Hint: This might require verification of user presence on security token.)",
emoji_enabled() ? special_glyph(SPECIAL_GLYPH_TOUCH) : "",
emoji_enabled() ? " " : "");
r = sym_fido_dev_make_cred(d, c, NULL);
if (r == FIDO_ERR_PIN_REQUIRED) {
for (;;) {
_cleanup_(strv_free_erasep) char **pin = NULL;
char **i;
r = ask_password_auto("Please enter security token PIN:", askpw_icon_name, NULL, "fido2-pin", USEC_INFINITY, 0, &pin);
if (r < 0)
return log_error_errno(r, "Failed to acquire user PIN: %m");
r = FIDO_ERR_PIN_INVALID;
STRV_FOREACH(i, pin) {
if (isempty(*i)) {
log_info("PIN may not be empty.");
continue;
}
r = sym_fido_dev_make_cred(d, c, *i);
if (r == FIDO_OK) {
used_pin = strdup(*i);
if (!used_pin)
return log_oom();
break;
}
if (r != FIDO_ERR_PIN_INVALID)
break;
}
if (r != FIDO_ERR_PIN_INVALID)
break;
log_notice("PIN incorrect, please try again.");
}
}
if (r == FIDO_ERR_PIN_AUTH_BLOCKED)
return log_notice_errno(SYNTHETIC_ERRNO(EPERM),
"Token PIN is currently blocked, please remove and reinsert token.");
if (r == FIDO_ERR_ACTION_TIMEOUT)
return log_error_errno(SYNTHETIC_ERRNO(ENOSTR),
"Token action timeout. (User didn't interact with token quickly enough.)");
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to generate FIDO2 credential: %s", sym_fido_strerr(r));
cid = sym_fido_cred_id_ptr(c);
if (!cid)
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to get FIDO2 credential ID.");
cid_size = sym_fido_cred_id_len(c);
a = sym_fido_assert_new();
if (!a)
return log_oom();
r = sym_fido_assert_set_extensions(a, FIDO_EXT_HMAC_SECRET);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to enable HMAC-SECRET extension on FIDO2 assertion: %s", sym_fido_strerr(r));
r = sym_fido_assert_set_hmac_salt(a, salt, FIDO2_SALT_SIZE);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to set salt on FIDO2 assertion: %s", sym_fido_strerr(r));
r = sym_fido_assert_set_rp(a, rp_id);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to set FIDO2 assertion ID: %s", sym_fido_strerr(r));
r = sym_fido_assert_set_clientdata_hash(a, (const unsigned char[32]) {}, 32);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to set FIDO2 assertion client data hash: %s", sym_fido_strerr(r));
r = sym_fido_assert_allow_cred(a, cid, cid_size);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to add FIDO2 assertion credential ID: %s", sym_fido_strerr(r));
r = sym_fido_assert_set_up(a, FIDO_OPT_FALSE);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to turn off FIDO2 assertion user presence: %s", sym_fido_strerr(r));
log_info("Generating secret key on FIDO2 security token.");
r = sym_fido_dev_get_assert(d, a, used_pin);
if (r == FIDO_ERR_UP_REQUIRED) {
r = sym_fido_assert_set_up(a, FIDO_OPT_TRUE);
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to turn on FIDO2 assertion user presence: %s", sym_fido_strerr(r));
log_notice("%s%sIn order to allow secret key generation, please verify presence on security token.",
emoji_enabled() ? special_glyph(SPECIAL_GLYPH_TOUCH) : "",
emoji_enabled() ? " " : "");
r = sym_fido_dev_get_assert(d, a, used_pin);
}
if (r == FIDO_ERR_ACTION_TIMEOUT)
return log_error_errno(SYNTHETIC_ERRNO(ENOSTR),
"Token action timeout. (User didn't interact with token quickly enough.)");
if (r != FIDO_OK)
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to ask token for assertion: %s", sym_fido_strerr(r));
secret = sym_fido_assert_hmac_secret_ptr(a, 0);
if (!secret)
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to retrieve HMAC secret.");
secret_size = sym_fido_assert_hmac_secret_len(a, 0);
secret_copy = memdup(secret, secret_size);
if (!secret_copy)
return log_oom();
cid_copy = memdup(cid, cid_size);
if (!cid_copy)
return log_oom();
*ret_cid = TAKE_PTR(cid_copy);
*ret_cid_size = cid_size;
*ret_salt = TAKE_PTR(salt);
*ret_salt_size = FIDO2_SALT_SIZE;
*ret_secret = TAKE_PTR(secret_copy);
*ret_secret_size = secret_size;
if (ret_usedpin)
*ret_usedpin = TAKE_PTR(used_pin);
return 0;
}
#endif
int fido2_list_devices(void) {
#if HAVE_LIBFIDO2
_cleanup_(table_unrefp) Table *t = NULL;
size_t allocated = 64, found = 0;
fido_dev_info_t *di = NULL;
int r;
r = dlopen_libfido2();
if (r < 0)
return log_error_errno(r, "FIDO2 token support is not installed.");
di = sym_fido_dev_info_new(allocated);
if (!di)
return log_oom();
r = sym_fido_dev_info_manifest(di, allocated, &found);
if (r == FIDO_ERR_INTERNAL || (r == FIDO_OK && found == 0)) {
/* The library returns FIDO_ERR_INTERNAL when no devices are found. I wish it wouldn't. */
log_info("No FIDO2 devices found.");
r = 0;
goto finish;
}
if (r != FIDO_OK) {
r = log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to enumerate FIDO2 devices: %s", sym_fido_strerr(r));
goto finish;
}
t = table_new("path", "manufacturer", "product");
if (!t) {
r = log_oom();
goto finish;
}
for (size_t i = 0; i < found; i++) {
const fido_dev_info_t *entry;
entry = sym_fido_dev_info_ptr(di, i);
if (!entry) {
r = log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to get device information for FIDO device %zu.", i);
goto finish;
}
r = table_add_many(
t,
TABLE_PATH, sym_fido_dev_info_path(entry),
TABLE_STRING, sym_fido_dev_info_manufacturer_string(entry),
TABLE_STRING, sym_fido_dev_info_product_string(entry));
if (r < 0) {
table_log_add_error(r);
goto finish;
}
}
r = table_print(t, stdout);
if (r < 0) {
log_error_errno(r, "Failed to show device table: %m");
goto finish;
}
r = 0;
finish:
sym_fido_dev_info_free(&di, allocated);
return r;
#else
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"FIDO2 tokens not supported on this build.");
#endif
}
int fido2_find_device_auto(char **ret) {
#if HAVE_LIBFIDO2
_cleanup_free_ char *copy = NULL;
size_t di_size = 64, found = 0;
const fido_dev_info_t *entry;
fido_dev_info_t *di = NULL;
const char *path;
int r;
r = dlopen_libfido2();
if (r < 0)
return log_error_errno(r, "FIDO2 token support is not installed.");
di = sym_fido_dev_info_new(di_size);
if (!di)
return log_oom();
r = sym_fido_dev_info_manifest(di, di_size, &found);
if (r == FIDO_ERR_INTERNAL || (r == FIDO_OK && found == 0)) {
/* The library returns FIDO_ERR_INTERNAL when no devices are found. I wish it wouldn't. */
r = log_error_errno(SYNTHETIC_ERRNO(ENODEV), "No FIDO devices found.");
goto finish;
}
if (r != FIDO_OK) {
r = log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to enumerate FIDO devices: %s", sym_fido_strerr(r));
goto finish;
}
if (found > 1) {
r = log_error_errno(SYNTHETIC_ERRNO(ENOTUNIQ), "More than one FIDO device found.");
goto finish;
}
entry = sym_fido_dev_info_ptr(di, 0);
if (!entry) {
r = log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to get device information for FIDO device 0.");
goto finish;
}
path = sym_fido_dev_info_path(entry);
if (!path) {
r = log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to query FIDO device path.");
goto finish;
}
copy = strdup(path);
if (!copy) {
r = log_oom();
goto finish;
}
*ret = TAKE_PTR(copy);
r = 0;
finish:
sym_fido_dev_info_free(&di, di_size);
return r;
#else
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"FIDO2 tokens not supported on this build.");
#endif
}
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