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fido2: when listing fido2/hmac-secret devices, actually validate feature set

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This commit is contained in:
Lennart Poettering 2020-12-17 13:55:50 +01:00
parent a60d5b2f38
commit 1abaa19781
1 changed files with 45 additions and 4 deletions
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49
src/shared/libfido2-util.c
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@ -130,6 +130,7 @@ int dlopen_libfido2(void) {
static int verify_features(
fido_dev_t *d,
const char *path,
int log_level, /* the log level to use when device is not FIDO2 with hmac-secret */
bool *ret_has_rk,
bool *ret_has_client_pin,
bool *ret_has_up,
@ -147,7 +148,8 @@ static int verify_features(
assert(path);
if (!sym_fido_dev_is_fido2(d))
return log_error_errno(SYNTHETIC_ERRNO(ENODEV),
return log_full_errno(log_level,
SYNTHETIC_ERRNO(ENODEV),
"Specified device %s is not a FIDO2 device.", path);
di = sym_fido_cbor_info_new();
@ -183,7 +185,8 @@ static int verify_features(
}
if (!found_extension)
return log_error_errno(SYNTHETIC_ERRNO(ENODEV),
return log_full_errno(log_level,
SYNTHETIC_ERRNO(ENODEV),
"Specified device %s is a FIDO2 device, but does not support the required HMAC-SECRET extension.", path);
log_debug("Has rk ('Resident Key') support: %s\n"
@ -243,7 +246,7 @@ static int fido2_use_hmac_hash_specific_token(
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to open FIDO2 device %s: %s", path, sym_fido_strerr(r));
r = verify_features(d, path, NULL, &has_client_pin, &has_up, NULL);
r = verify_features(d, path, LOG_ERR, NULL, &has_client_pin, &has_up, NULL);
if (r < 0)
return r;
@ -496,7 +499,7 @@ int fido2_generate_hmac_hash(
return log_error_errno(SYNTHETIC_ERRNO(EIO),
"Failed to open FIDO2 device %s: %s", device, sym_fido_strerr(r));
r = verify_features(d, device, &has_rk, &has_client_pin, &has_up, &has_uv);
r = verify_features(d, device, LOG_ERR, &has_rk, &has_client_pin, &has_up, &has_uv);
if (r < 0)
return r;
@ -697,6 +700,30 @@ int fido2_generate_hmac_hash(
}
#endif
#if HAVE_LIBFIDO2
static int check_device_is_fido2_with_hmac_secret(const char *path) {
_cleanup_(fido_dev_free_wrapper) fido_dev_t *d = NULL;
int r;
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));
r = verify_features(d, path, LOG_DEBUG, NULL, NULL, NULL, NULL);
if (r == -ENODEV) /* Not a FIDO2 device, or not implementing 'hmac-secret' */
return false;
if (r < 0)
return r;
return true;
}
#endif
int fido2_list_devices(void) {
#if HAVE_LIBFIDO2
_cleanup_(table_unrefp) Table *t = NULL;
@ -740,6 +767,12 @@ int fido2_list_devices(void) {
goto finish;
}
r = check_device_is_fido2_with_hmac_secret(sym_fido_dev_info_path(entry));
if (r < 0)
goto finish;
if (!r)
continue;
r = table_add_many(
t,
TABLE_PATH, sym_fido_dev_info_path(entry),
@ -807,6 +840,14 @@ int fido2_find_device_auto(char **ret) {
goto finish;
}
r = check_device_is_fido2_with_hmac_secret(sym_fido_dev_info_path(entry));
if (r < 0)
goto finish;
if (!r) {
r = log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "FIDO device discovered does not implement FIDO2 with 'hmac-secret' extension.");
goto finish;
}
path = sym_fido_dev_info_path(entry);
if (!path) {
r = log_error_errno(SYNTHETIC_ERRNO(EIO),