diff options
Diffstat (limited to 'gnu/packages/patches/nettle-3.5-CVE-2021-3580-pt1.patch')
| -rw-r--r-- | gnu/packages/patches/nettle-3.5-CVE-2021-3580-pt1.patch | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/gnu/packages/patches/nettle-3.5-CVE-2021-3580-pt1.patch b/gnu/packages/patches/nettle-3.5-CVE-2021-3580-pt1.patch new file mode 100644 index 0000000000..4343c87795 --- /dev/null +++ b/gnu/packages/patches/nettle-3.5-CVE-2021-3580-pt1.patch @@ -0,0 +1,276 @@ +Copied from upstream nettle git repository. +Removed changes to ChangeLog, to allow this patch to apply to nettle-3.5. + +From 485b5e2820a057e873b1ba812fdb39cae4adf98c Mon Sep 17 00:00:00 2001 +From: Niels Möller <nisse@lysator.liu.se> +Date: Mon, 17 May 2021 20:55:26 +0200 +Subject: [PATCH 1/2] Change _rsa_sec_compute_root_tr to take a fix input size. + +Improves consistency with _rsa_sec_compute_root, and fixes zero-input bug. +--- + ChangeLog | 15 +++++++++ + rsa-decrypt-tr.c | 7 ++--- + rsa-internal.h | 4 +-- + rsa-sec-decrypt.c | 9 ++++-- + rsa-sign-tr.c | 61 +++++++++++++++++------------------- + testsuite/rsa-encrypt-test.c | 14 ++++++++- + 6 files changed, 68 insertions(+), 42 deletions(-) + +diff --git a/rsa-decrypt-tr.c b/rsa-decrypt-tr.c +index 0224c0b7..927a8915 100644 +--- a/rsa-decrypt-tr.c ++++ b/rsa-decrypt-tr.c +@@ -52,14 +52,13 @@ rsa_decrypt_tr(const struct rsa_public_key *pub, + mp_size_t key_limb_size; + int res; + +- key_limb_size = NETTLE_OCTET_SIZE_TO_LIMB_SIZE(key->size); ++ key_limb_size = mpz_size(pub->n); + + TMP_GMP_ALLOC (m, key_limb_size); + TMP_GMP_ALLOC (em, key->size); ++ mpz_limbs_copy(m, gibberish, key_limb_size); + +- res = _rsa_sec_compute_root_tr (pub, key, random_ctx, random, m, +- mpz_limbs_read(gibberish), +- mpz_size(gibberish)); ++ res = _rsa_sec_compute_root_tr (pub, key, random_ctx, random, m, m); + + mpn_get_base256 (em, key->size, m, key_limb_size); + +diff --git a/rsa-internal.h b/rsa-internal.h +index b828e451..f66a7df0 100644 +--- a/rsa-internal.h ++++ b/rsa-internal.h +@@ -78,11 +78,11 @@ _rsa_sec_compute_root(const struct rsa_private_key *key, + mp_limb_t *scratch); + + /* Safe side-channel silent variant, using RSA blinding, and checking the +- * result after CRT. */ ++ * result after CRT. In-place calls, with x == m, is allowed. */ + int + _rsa_sec_compute_root_tr(const struct rsa_public_key *pub, + const struct rsa_private_key *key, + void *random_ctx, nettle_random_func *random, +- mp_limb_t *x, const mp_limb_t *m, size_t mn); ++ mp_limb_t *x, const mp_limb_t *m); + + #endif /* NETTLE_RSA_INTERNAL_H_INCLUDED */ +diff --git a/rsa-sec-decrypt.c b/rsa-sec-decrypt.c +index 6866e7c8..fc4757a0 100644 +--- a/rsa-sec-decrypt.c ++++ b/rsa-sec-decrypt.c +@@ -58,9 +58,12 @@ rsa_sec_decrypt(const struct rsa_public_key *pub, + TMP_GMP_ALLOC (m, mpz_size(pub->n)); + TMP_GMP_ALLOC (em, key->size); + +- res = _rsa_sec_compute_root_tr (pub, key, random_ctx, random, m, +- mpz_limbs_read(gibberish), +- mpz_size(gibberish)); ++ /* We need a copy because m can be shorter than key_size, ++ * but _rsa_sec_compute_root_tr expect all inputs to be ++ * normalized to a key_size long buffer length */ ++ mpz_limbs_copy(m, gibberish, mpz_size(pub->n)); ++ ++ res = _rsa_sec_compute_root_tr (pub, key, random_ctx, random, m, m); + + mpn_get_base256 (em, key->size, m, mpz_size(pub->n)); + +diff --git a/rsa-sign-tr.c b/rsa-sign-tr.c +index f824c4ca..9e137c7a 100644 +--- a/rsa-sign-tr.c ++++ b/rsa-sign-tr.c +@@ -131,35 +131,34 @@ int + _rsa_sec_compute_root_tr(const struct rsa_public_key *pub, + const struct rsa_private_key *key, + void *random_ctx, nettle_random_func *random, +- mp_limb_t *x, const mp_limb_t *m, size_t mn) ++ mp_limb_t *x, const mp_limb_t *m) + { ++ mp_size_t nn; + mpz_t mz; + mpz_t xz; + int res; + +- mpz_init(mz); + mpz_init(xz); + +- mpn_copyi(mpz_limbs_write(mz, mn), m, mn); +- mpz_limbs_finish(mz, mn); ++ nn = mpz_size (pub->n); + +- res = rsa_compute_root_tr(pub, key, random_ctx, random, xz, mz); ++ res = rsa_compute_root_tr(pub, key, random_ctx, random, xz, ++ mpz_roinit_n(mz, m, nn)); + + if (res) +- mpz_limbs_copy(x, xz, mpz_size(pub->n)); ++ mpz_limbs_copy(x, xz, nn); + +- mpz_clear(mz); + mpz_clear(xz); + return res; + } + #else + /* Blinds m, by computing c = m r^e (mod n), for a random r. Also +- returns the inverse (ri), for use by rsa_unblind. */ ++ returns the inverse (ri), for use by rsa_unblind. Must have c != m, ++ no in-place operation.*/ + static void + rsa_sec_blind (const struct rsa_public_key *pub, + void *random_ctx, nettle_random_func *random, +- mp_limb_t *c, mp_limb_t *ri, const mp_limb_t *m, +- mp_size_t mn) ++ mp_limb_t *c, mp_limb_t *ri, const mp_limb_t *m) + { + const mp_limb_t *ep = mpz_limbs_read (pub->e); + const mp_limb_t *np = mpz_limbs_read (pub->n); +@@ -177,15 +176,15 @@ rsa_sec_blind (const struct rsa_public_key *pub, + + /* c = m*(r^e) mod n */ + itch = mpn_sec_powm_itch(nn, ebn, nn); +- i2 = mpn_sec_mul_itch(nn, mn); ++ i2 = mpn_sec_mul_itch(nn, nn); + itch = MAX(itch, i2); +- i2 = mpn_sec_div_r_itch(nn + mn, nn); ++ i2 = mpn_sec_div_r_itch(2*nn, nn); + itch = MAX(itch, i2); + i2 = mpn_sec_invert_itch(nn); + itch = MAX(itch, i2); + +- TMP_GMP_ALLOC (tp, nn + mn + itch); +- scratch = tp + nn + mn; ++ TMP_GMP_ALLOC (tp, 2*nn + itch); ++ scratch = tp + 2*nn; + + /* ri = r^(-1) */ + do +@@ -198,9 +197,8 @@ rsa_sec_blind (const struct rsa_public_key *pub, + while (!mpn_sec_invert (ri, tp, np, nn, 2 * nn * GMP_NUMB_BITS, scratch)); + + mpn_sec_powm (c, rp, nn, ep, ebn, np, nn, scratch); +- /* normally mn == nn, but m can be smaller in some cases */ +- mpn_sec_mul (tp, c, nn, m, mn, scratch); +- mpn_sec_div_r (tp, nn + mn, np, nn, scratch); ++ mpn_sec_mul (tp, c, nn, m, nn, scratch); ++ mpn_sec_div_r (tp, 2*nn, np, nn, scratch); + mpn_copyi(c, tp, nn); + + TMP_GMP_FREE (r); +@@ -208,7 +206,7 @@ rsa_sec_blind (const struct rsa_public_key *pub, + TMP_GMP_FREE (tp); + } + +-/* m = c ri mod n */ ++/* m = c ri mod n. Allows x == c. */ + static void + rsa_sec_unblind (const struct rsa_public_key *pub, + mp_limb_t *x, mp_limb_t *ri, const mp_limb_t *c) +@@ -299,7 +297,7 @@ int + _rsa_sec_compute_root_tr(const struct rsa_public_key *pub, + const struct rsa_private_key *key, + void *random_ctx, nettle_random_func *random, +- mp_limb_t *x, const mp_limb_t *m, size_t mn) ++ mp_limb_t *x, const mp_limb_t *m) + { + TMP_GMP_DECL (c, mp_limb_t); + TMP_GMP_DECL (ri, mp_limb_t); +@@ -307,7 +305,7 @@ _rsa_sec_compute_root_tr(const struct rsa_public_key *pub, + size_t key_limb_size; + int ret; + +- key_limb_size = NETTLE_OCTET_SIZE_TO_LIMB_SIZE(key->size); ++ key_limb_size = mpz_size(pub->n); + + /* mpz_powm_sec handles only odd moduli. If p, q or n is even, the + key is invalid and rejected by rsa_private_key_prepare. However, +@@ -321,19 +319,18 @@ _rsa_sec_compute_root_tr(const struct rsa_public_key *pub, + } + + assert(mpz_size(pub->n) == key_limb_size); +- assert(mn <= key_limb_size); + + TMP_GMP_ALLOC (c, key_limb_size); + TMP_GMP_ALLOC (ri, key_limb_size); + TMP_GMP_ALLOC (scratch, _rsa_sec_compute_root_itch(key)); + +- rsa_sec_blind (pub, random_ctx, random, x, ri, m, mn); ++ rsa_sec_blind (pub, random_ctx, random, c, ri, m); + +- _rsa_sec_compute_root(key, c, x, scratch); ++ _rsa_sec_compute_root(key, x, c, scratch); + +- ret = rsa_sec_check_root(pub, c, x); ++ ret = rsa_sec_check_root(pub, x, c); + +- rsa_sec_unblind(pub, x, ri, c); ++ rsa_sec_unblind(pub, x, ri, x); + + cnd_mpn_zero(1 - ret, x, key_limb_size); + +@@ -357,17 +354,17 @@ rsa_compute_root_tr(const struct rsa_public_key *pub, + mpz_t x, const mpz_t m) + { + TMP_GMP_DECL (l, mp_limb_t); ++ mp_size_t nn = mpz_size(pub->n); + int res; + +- mp_size_t l_size = NETTLE_OCTET_SIZE_TO_LIMB_SIZE(key->size); +- TMP_GMP_ALLOC (l, l_size); ++ TMP_GMP_ALLOC (l, nn); ++ mpz_limbs_copy(l, m, nn); + +- res = _rsa_sec_compute_root_tr (pub, key, random_ctx, random, l, +- mpz_limbs_read(m), mpz_size(m)); ++ res = _rsa_sec_compute_root_tr (pub, key, random_ctx, random, l, l); + if (res) { +- mp_limb_t *xp = mpz_limbs_write (x, l_size); +- mpn_copyi (xp, l, l_size); +- mpz_limbs_finish (x, l_size); ++ mp_limb_t *xp = mpz_limbs_write (x, nn); ++ mpn_copyi (xp, l, nn); ++ mpz_limbs_finish (x, nn); + } + + TMP_GMP_FREE (l); +diff --git a/testsuite/rsa-encrypt-test.c b/testsuite/rsa-encrypt-test.c +index 87525f78..d3bc374b 100644 +--- a/testsuite/rsa-encrypt-test.c ++++ b/testsuite/rsa-encrypt-test.c +@@ -19,6 +19,7 @@ test_main(void) + uint8_t after; + + mpz_t gibberish; ++ mpz_t zero; + + rsa_private_key_init(&key); + rsa_public_key_init(&pub); +@@ -101,6 +102,17 @@ test_main(void) + ASSERT(decrypted[decrypted_length] == after); + ASSERT(decrypted[0] == 'A'); + ++ /* Test zero input. */ ++ mpz_init_set_ui (zero, 0); ++ decrypted_length = msg_length; ++ ASSERT(!rsa_decrypt(&key, &decrypted_length, decrypted, zero)); ++ ASSERT(!rsa_decrypt_tr(&pub, &key, ++ &lfib, (nettle_random_func *) knuth_lfib_random, ++ &decrypted_length, decrypted, zero)); ++ ASSERT(!rsa_sec_decrypt(&pub, &key, ++ &lfib, (nettle_random_func *) knuth_lfib_random, ++ decrypted_length, decrypted, zero)); ++ ASSERT(decrypted_length == msg_length); + + /* Test invalid key. */ + mpz_add_ui (key.q, key.q, 2); +@@ -112,6 +124,6 @@ test_main(void) + rsa_private_key_clear(&key); + rsa_public_key_clear(&pub); + mpz_clear(gibberish); ++ mpz_clear(zero); + free(decrypted); + } +- +-- +2.31.1 + |