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openssl/0076-FIPS-140-3-DRBG.patch
Dmitry Belyavskiy 6eb72dd621 Increase RNG seeding buffer size to 32 
Related: rhbz#2168224
2023-03-14 17:30:33 +01:00

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diff -up openssl-3.0.1/providers/implementations/rands/seeding/rand_unix.c.fipsrand openssl-3.0.1/providers/implementations/rands/seeding/rand_unix.c
--- openssl-3.0.1/providers/implementations/rands/seeding/rand_unix.c.fipsrand 2022-08-03 11:09:01.301637515 +0200
+++ openssl-3.0.1/providers/implementations/rands/seeding/rand_unix.c 2022-08-03 11:13:00.058688605 +0200
@@ -48,6 +48,8 @@
# include <fcntl.h>
# include <unistd.h>
# include <sys/time.h>
+# include <sys/random.h>
+# include <openssl/evp.h>
static uint64_t get_time_stamp(void);
static uint64_t get_timer_bits(void);
@@ -342,66 +342,8 @@ static ssize_t syscall_random(void *buf,
* which is way below the OSSL_SSIZE_MAX limit. Therefore sign conversion
* between size_t and ssize_t is safe even without a range check.
*/
-
- /*
- * Do runtime detection to find getentropy().
- *
- * Known OSs that should support this:
- * - Darwin since 16 (OSX 10.12, IOS 10.0).
- * - Solaris since 11.3
- * - OpenBSD since 5.6
- * - Linux since 3.17 with glibc 2.25
- * - FreeBSD since 12.0 (1200061)
- *
- * Note: Sometimes getentropy() can be provided but not implemented
- * internally. So we need to check errno for ENOSYS
- */
-# if !defined(__DragonFly__) && !defined(__NetBSD__)
-# if defined(__GNUC__) && __GNUC__>=2 && defined(__ELF__) && !defined(__hpux)
- extern int getentropy(void *buffer, size_t length) __attribute__((weak));
-
- if (getentropy != NULL) {
- if (getentropy(buf, buflen) == 0)
- return (ssize_t)buflen;
- if (errno != ENOSYS)
- return -1;
- }
-# elif defined(OPENSSL_APPLE_CRYPTO_RANDOM)
-
- if (CCRandomGenerateBytes(buf, buflen) == kCCSuccess)
- return (ssize_t)buflen;
-
- return -1;
-# else
- union {
- void *p;
- int (*f)(void *buffer, size_t length);
- } p_getentropy;
-
- /*
- * We could cache the result of the lookup, but we normally don't
- * call this function often.
- */
- ERR_set_mark();
- p_getentropy.p = DSO_global_lookup("getentropy");
- ERR_pop_to_mark();
- if (p_getentropy.p != NULL)
- return p_getentropy.f(buf, buflen) == 0 ? (ssize_t)buflen : -1;
-# endif
-# endif /* !__DragonFly__ */
-
- /* Linux supports this since version 3.17 */
-# if defined(__linux) && defined(__NR_getrandom)
- return syscall(__NR_getrandom, buf, buflen, 0);
-# elif (defined(__FreeBSD__) || defined(__NetBSD__)) && defined(KERN_ARND)
- return sysctl_random(buf, buflen);
-# elif (defined(__DragonFly__) && __DragonFly_version >= 500700) \
- || (defined(__NetBSD__) && __NetBSD_Version >= 1000000000)
- return getrandom(buf, buflen, 0);
-# else
- errno = ENOSYS;
- return -1;
-# endif
+ /* Red Hat uses downstream patch to always seed from getrandom() */
+ return EVP_default_properties_is_fips_enabled(NULL) ? getrandom(buf, buflen, GRND_RANDOM) : getrandom(buf, buflen, 0);
}
# endif /* defined(OPENSSL_RAND_SEED_GETRANDOM) */
diff -up openssl-3.0.1/providers/implementations/rands/drbg.c.fipsrand openssl-3.0.1/providers/implementations/rands/drbg.c
--- openssl-3.0.1/providers/implementations/rands/drbg.c.fipsrand 2022-08-03 12:14:39.409370134 +0200
+++ openssl-3.0.1/providers/implementations/rands/drbg.c 2022-08-03 12:19:06.320700346 +0200
@@ -575,6 +575,9 @@ int ossl_prov_drbg_reseed(PROV_DRBG *drb
#endif
}
+#ifdef FIPS_MODULE
+ prediction_resistance = 1;
+#endif
/* Reseed using our sources in addition */
entropylen = get_entropy(drbg, &entropy, drbg->strength,
drbg->min_entropylen, drbg->max_entropylen,
@@ -669,8 +669,14 @@ int ossl_prov_drbg_generate(PROV_DRBG *d
reseed_required = 1;
}
if (drbg->parent != NULL
- && get_parent_reseed_count(drbg) != drbg->parent_reseed_counter)
+ && get_parent_reseed_count(drbg) != drbg->parent_reseed_counter) {
+#ifdef FIPS_MODULE
+ /* Red Hat patches provide chain reseeding when necessary so just sync counters*/
+ drbg->parent_reseed_counter = get_parent_reseed_count(drbg);
+#else
reseed_required = 1;
+#endif
+ }
if (reseed_required || prediction_resistance) {
if (!ossl_prov_drbg_reseed(drbg, prediction_resistance, NULL, 0,
diff -up openssl-3.0.1/crypto/rand/prov_seed.c.fipsrand openssl-3.0.1/crypto/rand/prov_seed.c
--- openssl-3.0.1/crypto/rand/prov_seed.c.fipsrand 2022-08-04 12:17:52.148556301 +0200
+++ openssl-3.0.1/crypto/rand/prov_seed.c 2022-08-04 12:19:41.783533552 +0200
@@ -20,7 +20,14 @@ size_t ossl_rand_get_entropy(ossl_unused
size_t entropy_available;
RAND_POOL *pool;
- pool = ossl_rand_pool_new(entropy, 1, min_len, max_len);
+ /*
+ * OpenSSL still implements an internal entropy pool of
+ * some size that is hashed to get seed data.
+ * Note that this is a conditioning step for which SP800-90C requires
+ * 64 additional bits from the entropy source to claim the requested
+ * amount of entropy.
+ */
+ pool = ossl_rand_pool_new(entropy + 64, 1, min_len, max_len);
if (pool == NULL) {
ERR_raise(ERR_LIB_RAND, ERR_R_MALLOC_FAILURE);
return 0;
diff -up openssl-3.0.1/providers/implementations/rands/crngt.c.fipsrand openssl-3.0.1/providers/implementations/rands/crngt.c
--- openssl-3.0.1/providers/implementations/rands/crngt.c.fipsrand 2022-08-04 11:56:10.100950299 +0200
+++ openssl-3.0.1/providers/implementations/rands/crngt.c 2022-08-04 11:59:11.241564925 +0200
@@ -139,7 +139,11 @@ size_t ossl_crngt_get_entropy(PROV_DRBG
* to the nearest byte. If the entropy is of less than full quality,
* the amount required should be scaled up appropriately here.
*/
- bytes_needed = (entropy + 7) / 8;
+ /*
+ * FIPS 140-3: the yet draft SP800-90C requires requested entropy
+ * + 128 bits during initial seeding
+ */
+ bytes_needed = (entropy + 128 + 7) / 8;
if (bytes_needed < min_len)
bytes_needed = min_len;
if (bytes_needed > max_len)
diff -up openssl-3.0.7/providers/implementations/rands/drbg_local.h.drbg openssl-3.0.7/providers/implementations/rands/drbg_local.h
--- openssl-3.0.7/providers/implementations/rands/drbg_local.h.drbg 2023-03-13 12:17:47.705538612 +0100
+++ openssl-3.0.7/providers/implementations/rands/drbg_local.h 2023-03-13 12:18:03.060702092 +0100
@@ -38,7 +38,7 @@
*
* The value is in bytes.
*/
-#define CRNGT_BUFSIZ 16
+#define CRNGT_BUFSIZ 32
/*
* Maximum input size for the DRBG (entropy, nonce, personalization string)
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