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Ensure access to FIPS_state and rate_limit is appropriately locked

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These variables can be accessed concurrently from multiple threads so
we ensure that we properly lock them before read or write.

Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13987)
This commit is contained in:
Matt Caswell 2021-01-27 15:51:48 +00:00
parent 04b9435a99
commit 4099460514
1 changed files with 33 additions and 13 deletions
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46
providers/fips/self_test.c
View File

@ -47,18 +47,19 @@
static int FIPS_conditional_error_check = 1;
static int FIPS_state = FIPS_STATE_INIT;
static CRYPTO_RWLOCK *self_test_lock = NULL;
static CRYPTO_RWLOCK *fips_state_lock = NULL;
static unsigned char fixed_key[32] = { FIPS_KEY_ELEMENTS };
static CRYPTO_ONCE fips_self_test_init = CRYPTO_ONCE_STATIC_INIT;
DEFINE_RUN_ONCE_STATIC(do_fips_self_test_init)
{
/*
* This lock gets freed in platform specific ways that may occur after we
* These locks get freed in platform specific ways that may occur after we
* do mem leak checking. If we don't know how to free it for a particular
* platform then we just leak it deliberately. So we temporarily disable the
* mem leak checking while we allocate this.
* platform then we just leak it deliberately.
*/
self_test_lock = CRYPTO_THREAD_lock_new();
fips_state_lock = CRYPTO_THREAD_lock_new();
return self_test_lock != NULL;
}
@ -150,6 +151,7 @@ DEP_INIT_ATTRIBUTE void init(void)
DEP_FINI_ATTRIBUTE void cleanup(void)
{
CRYPTO_THREAD_lock_free(self_test_lock);
CRYPTO_THREAD_lock_free(fips_state_lock);
}
#endif
@ -212,6 +214,13 @@ err:
return ret;
}
static void set_fips_state(int state)
{
CRYPTO_THREAD_write_lock(fips_state_lock);
FIPS_state = state;
CRYPTO_THREAD_unlock(fips_state_lock);
}
/* This API is triggered either on loading of the FIPS module or on demand */
int SELF_TEST_post(SELF_TEST_POST_PARAMS *st, int on_demand_test)
{
@ -227,9 +236,9 @@ int SELF_TEST_post(SELF_TEST_POST_PARAMS *st, int on_demand_test)
if (!RUN_ONCE(&fips_self_test_init, do_fips_self_test_init))
return 0;
CRYPTO_THREAD_read_lock(self_test_lock);
CRYPTO_THREAD_read_lock(fips_state_lock);
loclstate = FIPS_state;
CRYPTO_THREAD_unlock(self_test_lock);
CRYPTO_THREAD_unlock(fips_state_lock);
if (loclstate == FIPS_STATE_RUNNING) {
if (!on_demand_test)
@ -240,17 +249,23 @@ int SELF_TEST_post(SELF_TEST_POST_PARAMS *st, int on_demand_test)
}
CRYPTO_THREAD_write_lock(self_test_lock);
CRYPTO_THREAD_read_lock(fips_state_lock);
if (FIPS_state == FIPS_STATE_RUNNING) {
CRYPTO_THREAD_unlock(fips_state_lock);
if (!on_demand_test) {
CRYPTO_THREAD_unlock(self_test_lock);
return 1;
}
FIPS_state = FIPS_STATE_SELFTEST;
set_fips_state(FIPS_STATE_SELFTEST);
} else if (FIPS_state != FIPS_STATE_SELFTEST) {
CRYPTO_THREAD_unlock(fips_state_lock);
CRYPTO_THREAD_unlock(self_test_lock);
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_STATE);
return 0;
} else {
CRYPTO_THREAD_unlock(fips_state_lock);
}
if (st == NULL
|| st->module_checksum_data == NULL) {
ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_CONFIG_DATA);
@ -328,7 +343,7 @@ end:
(*st->bio_free_cb)(bio_module);
}
if (ok)
FIPS_state = FIPS_STATE_RUNNING;
set_fips_state(FIPS_STATE_RUNNING);
else
ossl_set_error_state(OSSL_SELF_TEST_TYPE_NONE);
CRYPTO_THREAD_unlock(self_test_lock);
@ -346,7 +361,7 @@ void ossl_set_error_state(const char *type)
int cond_test = (type != NULL && strcmp(type, OSSL_SELF_TEST_TYPE_PCT) == 0);
if (!cond_test || (FIPS_conditional_error_check == 1)) {
FIPS_state = FIPS_STATE_ERROR;
set_fips_state(FIPS_STATE_ERROR);
ERR_raise(ERR_LIB_PROV, PROV_R_FIPS_MODULE_ENTERING_ERROR_STATE);
} else {
ERR_raise(ERR_LIB_PROV, PROV_R_FIPS_MODULE_CONDITIONAL_ERROR);
@ -355,15 +370,20 @@ void ossl_set_error_state(const char *type)
int ossl_prov_is_running(void)
{
const int res = FIPS_state == FIPS_STATE_RUNNING
|| FIPS_state == FIPS_STATE_SELFTEST;
int res;
static unsigned int rate_limit = 0;
if (res) {
rate_limit = 0;
} else if (FIPS_state == FIPS_STATE_ERROR) {
if (!CRYPTO_THREAD_read_lock(fips_state_lock))
return 0;
res = FIPS_state == FIPS_STATE_RUNNING
|| FIPS_state == FIPS_STATE_SELFTEST;
if (FIPS_state == FIPS_STATE_ERROR) {
CRYPTO_THREAD_unlock(fips_state_lock);
if (!CRYPTO_THREAD_write_lock(fips_state_lock))
return 0;
if (rate_limit++ < FIPS_ERROR_REPORTING_RATE_LIMIT)
ERR_raise(ERR_LIB_PROV, PROV_R_FIPS_MODULE_IN_ERROR_STATE);
}
CRYPTO_THREAD_unlock(fips_state_lock);
return res;
}