From f75abcc0f073b1c3e2d81df3fcde8fe45dd1e61f Mon Sep 17 00:00:00 2001 From: Shane Lontis Date: Mon, 18 Nov 2019 13:13:05 +1000 Subject: [PATCH] Fix Use after free when copying cipher ctx Fixes #10438 issue found by clusterfuzz/ossfuzz The dest was getting a copy of the src structure which contained a pointer that should point to an offset inside itself - because of the copy it was pointing to the original structure. The setup for a ctx is mainly done by the initkey method in the PROV_CIPHER_HW structure. Because of this it makes sense that the structure should also contain a copyctx method that is use to resolve any pointers that need to be setup. A dup_ctx has been added to the cipher_enc tests in evp_test. It does a dup after setup and then frees the original ctx. This detects any floating pointers in the duplicated context that were pointing back to the freed ctx. Reviewed-by: Matt Caswell (Merged from https://github.com/openssl/openssl/pull/10443) --- providers/common/include/prov/ciphercommon.h | 11 ++++++ .../implementations/ciphers/cipher_aes.c | 2 +- .../implementations/ciphers/cipher_aes_hw.c | 5 ++- .../ciphers/cipher_aes_hw_aesni.inc | 3 +- .../ciphers/cipher_aes_hw_s390x.inc | 1 + .../ciphers/cipher_aes_hw_t4.inc | 3 +- .../implementations/ciphers/cipher_aes_ocb.c | 4 +-- .../implementations/ciphers/cipher_aes_xts.c | 2 +- .../ciphers/cipher_aes_xts_hw.c | 20 +++++++++-- .../implementations/ciphers/cipher_aria.c | 2 +- .../implementations/ciphers/cipher_aria_hw.c | 5 ++- .../implementations/ciphers/cipher_camellia.c | 2 +- .../ciphers/cipher_camellia_hw.c | 5 ++- .../ciphers/cipher_camellia_hw_t4.inc | 3 +- .../implementations/ciphers/cipher_sm4.c | 2 +- .../implementations/ciphers/cipher_sm4_hw.c | 5 ++- test/evp_test.c | 34 +++++++++++++------ 17 files changed, 82 insertions(+), 27 deletions(-) diff --git a/providers/common/include/prov/ciphercommon.h b/providers/common/include/prov/ciphercommon.h index 2f77f48712..c9b0034017 100644 --- a/providers/common/include/prov/ciphercommon.h +++ b/providers/common/include/prov/ciphercommon.h @@ -68,6 +68,7 @@ struct prov_cipher_ctx_st { struct prov_cipher_hw_st { int (*init)(PROV_CIPHER_CTX *dat, const uint8_t *key, size_t keylen); PROV_CIPHER_HW_FN *cipher; + void (*copyctx)(PROV_CIPHER_CTX *dst, const PROV_CIPHER_CTX *src); }; OSSL_OP_cipher_encrypt_init_fn cipher_generic_einit; @@ -233,6 +234,16 @@ static int cipher_hw_##NAME##_##MODE##_cipher(PROV_CIPHER_CTX *ctx, \ return 1; \ } +#define IMPLEMENT_CIPHER_HW_COPYCTX(name, CTX_TYPE) \ +static void name(PROV_CIPHER_CTX *dst, const PROV_CIPHER_CTX *src) \ +{ \ + CTX_TYPE *sctx = (CTX_TYPE *)src; \ + CTX_TYPE *dctx = (CTX_TYPE *)dst; \ + \ + *dctx = *sctx; \ + dst->ks = &dctx->ks.ks; \ +} + #define CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_START(name) \ static const OSSL_PARAM name##_known_gettable_ctx_params[] = { \ OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL), \ diff --git a/providers/implementations/ciphers/cipher_aes.c b/providers/implementations/ciphers/cipher_aes.c index c62d2d2c29..561377a27b 100644 --- a/providers/implementations/ciphers/cipher_aes.c +++ b/providers/implementations/ciphers/cipher_aes.c @@ -31,7 +31,7 @@ static void *aes_dupctx(void *ctx) ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE); return NULL; } - *ret = *in; + in->base.hw->copyctx(&ret->base, &in->base); return ret; } diff --git a/providers/implementations/ciphers/cipher_aes_hw.c b/providers/implementations/ciphers/cipher_aes_hw.c index 8519662e73..bc733ee16a 100644 --- a/providers/implementations/ciphers/cipher_aes_hw.c +++ b/providers/implementations/ciphers/cipher_aes_hw.c @@ -106,10 +106,13 @@ static int cipher_hw_aes_initkey(PROV_CIPHER_CTX *dat, return 1; } +IMPLEMENT_CIPHER_HW_COPYCTX(cipher_hw_aes_copyctx, PROV_AES_CTX) + #define PROV_CIPHER_HW_aes_mode(mode) \ static const PROV_CIPHER_HW aes_##mode = { \ cipher_hw_aes_initkey, \ - cipher_hw_generic_##mode \ + cipher_hw_generic_##mode, \ + cipher_hw_aes_copyctx \ }; \ PROV_CIPHER_HW_declare(mode) \ const PROV_CIPHER_HW *PROV_CIPHER_HW_aes_##mode(size_t keybits) \ diff --git a/providers/implementations/ciphers/cipher_aes_hw_aesni.inc b/providers/implementations/ciphers/cipher_aes_hw_aesni.inc index 6070939dee..8d3aef69b7 100644 --- a/providers/implementations/ciphers/cipher_aes_hw_aesni.inc +++ b/providers/implementations/ciphers/cipher_aes_hw_aesni.inc @@ -76,7 +76,8 @@ static int cipher_hw_aesni_ecb(PROV_CIPHER_CTX *ctx, unsigned char *out, #define PROV_CIPHER_HW_declare(mode) \ static const PROV_CIPHER_HW aesni_##mode = { \ cipher_hw_aesni_initkey, \ - cipher_hw_aesni_##mode \ + cipher_hw_aesni_##mode, \ + cipher_hw_aes_copyctx \ }; #define PROV_CIPHER_HW_select(mode) \ if (AESNI_CAPABLE) \ diff --git a/providers/implementations/ciphers/cipher_aes_hw_s390x.inc b/providers/implementations/ciphers/cipher_aes_hw_s390x.inc index 805fa91e5f..f60ca9cba8 100644 --- a/providers/implementations/ciphers/cipher_aes_hw_s390x.inc +++ b/providers/implementations/ciphers/cipher_aes_hw_s390x.inc @@ -194,6 +194,7 @@ static int s390x_aes_cfb8_cipher_hw(PROV_CIPHER_CTX *dat, unsigned char *out, static const PROV_CIPHER_HW s390x_aes_##mode = { \ s390x_aes_##mode##_initkey, \ s390x_aes_##mode##_cipher_hw \ + cipher_hw_aes_copyctx \ }; #define PROV_CIPHER_HW_select(mode) \ if ((keybits == 128 && S390X_aes_128_##mode##_CAPABLE) \ diff --git a/providers/implementations/ciphers/cipher_aes_hw_t4.inc b/providers/implementations/ciphers/cipher_aes_hw_t4.inc index 21b672710a..07b65789f1 100644 --- a/providers/implementations/ciphers/cipher_aes_hw_t4.inc +++ b/providers/implementations/ciphers/cipher_aes_hw_t4.inc @@ -88,7 +88,8 @@ static int cipher_hw_aes_t4_initkey(PROV_CIPHER_CTX *dat, #define PROV_CIPHER_HW_declare(mode) \ static const PROV_CIPHER_HW aes_t4_##mode = { \ cipher_hw_aes_t4_initkey, \ - cipher_hw_generic_##mode \ + cipher_hw_generic_##mode, \ + cipher_hw_aes_copyctx \ }; #define PROV_CIPHER_HW_select(mode) \ if (SPARC_AES_CAPABLE) \ diff --git a/providers/implementations/ciphers/cipher_aes_ocb.c b/providers/implementations/ciphers/cipher_aes_ocb.c index d30a666fc5..ba4e4f29f8 100644 --- a/providers/implementations/ciphers/cipher_aes_ocb.c +++ b/providers/implementations/ciphers/cipher_aes_ocb.c @@ -84,8 +84,8 @@ static ossl_inline int aes_generic_ocb_cipher(PROV_AES_OCB_CTX *ctx, static ossl_inline int aes_generic_ocb_copy_ctx(PROV_AES_OCB_CTX *dst, PROV_AES_OCB_CTX *src) { - return (!CRYPTO_ocb128_copy_ctx(&dst->ocb, &src->ocb, - &src->ksenc.ks, &src->ksdec.ks)); + return CRYPTO_ocb128_copy_ctx(&dst->ocb, &src->ocb, + &dst->ksenc.ks, &dst->ksdec.ks); } /*- diff --git a/providers/implementations/ciphers/cipher_aes_xts.c b/providers/implementations/ciphers/cipher_aes_xts.c index 2ad1fbe84a..d60e08e194 100644 --- a/providers/implementations/ciphers/cipher_aes_xts.c +++ b/providers/implementations/ciphers/cipher_aes_xts.c @@ -134,7 +134,7 @@ static void *aes_xts_dupctx(void *vctx) ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE); return NULL; } - *ret = *in; + in->base.hw->copyctx(&ret->base, &in->base); return ret; } diff --git a/providers/implementations/ciphers/cipher_aes_xts_hw.c b/providers/implementations/ciphers/cipher_aes_xts_hw.c index 9ac70c4fa8..b9472b266e 100644 --- a/providers/implementations/ciphers/cipher_aes_xts_hw.c +++ b/providers/implementations/ciphers/cipher_aes_xts_hw.c @@ -76,6 +76,17 @@ static int cipher_hw_aes_xts_generic_initkey(PROV_CIPHER_CTX *ctx, return 1; } +static void cipher_hw_aes_xts_copyctx(PROV_CIPHER_CTX *dst, + const PROV_CIPHER_CTX *src) +{ + PROV_AES_XTS_CTX *sctx = (PROV_AES_XTS_CTX *)src; + PROV_AES_XTS_CTX *dctx = (PROV_AES_XTS_CTX *)dst; + + *dctx = *sctx; + dctx->xts.key1 = &dctx->ks1.ks; + dctx->xts.key2 = &dctx->ks2.ks; +} + #if defined(AESNI_CAPABLE) static int cipher_hw_aesni_xts_initkey(PROV_CIPHER_CTX *ctx, @@ -92,7 +103,8 @@ static int cipher_hw_aesni_xts_initkey(PROV_CIPHER_CTX *ctx, # define PROV_CIPHER_HW_declare_xts() \ static const PROV_CIPHER_HW aesni_xts = { \ cipher_hw_aesni_xts_initkey, \ - NULL \ + NULL, \ + cipher_hw_aes_xts_copyctx \ }; # define PROV_CIPHER_HW_select_xts() \ if (AESNI_CAPABLE) \ @@ -130,7 +142,8 @@ static int cipher_hw_aes_xts_t4_initkey(PROV_CIPHER_CTX *ctx, # define PROV_CIPHER_HW_declare_xts() \ static const PROV_CIPHER_HW aes_xts_t4 = { \ cipher_hw_aes_xts_t4_initkey, \ - NULL \ + NULL, \ + cipher_hw_aes_xts_copyctx \ }; # define PROV_CIPHER_HW_select_xts() \ if (SPARC_AES_CAPABLE) \ @@ -143,7 +156,8 @@ if (SPARC_AES_CAPABLE) \ static const PROV_CIPHER_HW aes_generic_xts = { cipher_hw_aes_xts_generic_initkey, - NULL + NULL, + cipher_hw_aes_xts_copyctx }; PROV_CIPHER_HW_declare_xts() const PROV_CIPHER_HW *PROV_CIPHER_HW_aes_xts(size_t keybits) diff --git a/providers/implementations/ciphers/cipher_aria.c b/providers/implementations/ciphers/cipher_aria.c index da864015bd..37afa06cb5 100644 --- a/providers/implementations/ciphers/cipher_aria.c +++ b/providers/implementations/ciphers/cipher_aria.c @@ -31,7 +31,7 @@ static void *aria_dupctx(void *ctx) ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE); return NULL; } - *ret = *in; + in->base.hw->copyctx(&ret->base, &in->base); return ret; } diff --git a/providers/implementations/ciphers/cipher_aria_hw.c b/providers/implementations/ciphers/cipher_aria_hw.c index b644be8dda..b0c5675f1b 100644 --- a/providers/implementations/ciphers/cipher_aria_hw.c +++ b/providers/implementations/ciphers/cipher_aria_hw.c @@ -29,10 +29,13 @@ static int cipher_hw_aria_initkey(PROV_CIPHER_CTX *dat, return 1; } +IMPLEMENT_CIPHER_HW_COPYCTX(cipher_hw_aria_copyctx, PROV_ARIA_CTX) + # define PROV_CIPHER_HW_aria_mode(mode) \ static const PROV_CIPHER_HW aria_##mode = { \ cipher_hw_aria_initkey, \ - cipher_hw_chunked_##mode \ + cipher_hw_chunked_##mode, \ + cipher_hw_aria_copyctx \ }; \ const PROV_CIPHER_HW *PROV_CIPHER_HW_aria_##mode(size_t keybits) \ { \ diff --git a/providers/implementations/ciphers/cipher_camellia.c b/providers/implementations/ciphers/cipher_camellia.c index cf9af3db32..d796f3635c 100644 --- a/providers/implementations/ciphers/cipher_camellia.c +++ b/providers/implementations/ciphers/cipher_camellia.c @@ -31,7 +31,7 @@ static void *camellia_dupctx(void *ctx) ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE); return NULL; } - *ret = *in; + in->base.hw->copyctx(&ret->base, &in->base); return ret; } diff --git a/providers/implementations/ciphers/cipher_camellia_hw.c b/providers/implementations/ciphers/cipher_camellia_hw.c index 39ba4bd0ac..fe844ae1a2 100644 --- a/providers/implementations/ciphers/cipher_camellia_hw.c +++ b/providers/implementations/ciphers/cipher_camellia_hw.c @@ -35,6 +35,8 @@ static int cipher_hw_camellia_initkey(PROV_CIPHER_CTX *dat, return 1; } +IMPLEMENT_CIPHER_HW_COPYCTX(cipher_hw_camellia_copyctx, PROV_CAMELLIA_CTX) + # if defined(SPARC_CMLL_CAPABLE) # include "cipher_camellia_hw_t4.inc" # else @@ -46,7 +48,8 @@ static int cipher_hw_camellia_initkey(PROV_CIPHER_CTX *dat, #define PROV_CIPHER_HW_camellia_mode(mode) \ static const PROV_CIPHER_HW camellia_##mode = { \ cipher_hw_camellia_initkey, \ - cipher_hw_generic_##mode \ + cipher_hw_generic_##mode, \ + cipher_hw_camellia_copyctx \ }; \ PROV_CIPHER_HW_declare(mode) \ const PROV_CIPHER_HW *PROV_CIPHER_HW_camellia_##mode(size_t keybits) \ diff --git a/providers/implementations/ciphers/cipher_camellia_hw_t4.inc b/providers/implementations/ciphers/cipher_camellia_hw_t4.inc index 24e104646b..96e5e20dbc 100644 --- a/providers/implementations/ciphers/cipher_camellia_hw_t4.inc +++ b/providers/implementations/ciphers/cipher_camellia_hw_t4.inc @@ -76,7 +76,8 @@ static int cipher_hw_camellia_t4_initkey(PROV_CIPHER_CTX *dat, #define PROV_CIPHER_HW_declare(mode) \ static const PROV_CIPHER_HW t4_camellia_##mode = { \ cipher_hw_camellia_t4_initkey, \ - cipher_hw_generic_##mode \ + cipher_hw_generic_##mode, \ + cipher_hw_camellia_copyctx \ }; #define PROV_CIPHER_HW_select(mode) \ if (SPARC_CMLL_CAPABLE) \ diff --git a/providers/implementations/ciphers/cipher_sm4.c b/providers/implementations/ciphers/cipher_sm4.c index bf9d220923..caa7ff9c21 100644 --- a/providers/implementations/ciphers/cipher_sm4.c +++ b/providers/implementations/ciphers/cipher_sm4.c @@ -31,7 +31,7 @@ static void *sm4_dupctx(void *ctx) ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE); return NULL; } - *ret = *in; + in->base.hw->copyctx(&ret->base, &in->base); return ret; } diff --git a/providers/implementations/ciphers/cipher_sm4_hw.c b/providers/implementations/ciphers/cipher_sm4_hw.c index 9ecaf0b997..73e88280c2 100644 --- a/providers/implementations/ciphers/cipher_sm4_hw.c +++ b/providers/implementations/ciphers/cipher_sm4_hw.c @@ -26,10 +26,13 @@ static int cipher_hw_sm4_initkey(PROV_CIPHER_CTX *ctx, return 1; } +IMPLEMENT_CIPHER_HW_COPYCTX(cipher_hw_sm4_copyctx, PROV_SM4_CTX) + # define PROV_CIPHER_HW_sm4_mode(mode) \ static const PROV_CIPHER_HW sm4_##mode = { \ cipher_hw_sm4_initkey, \ - cipher_hw_chunked_##mode \ + cipher_hw_chunked_##mode, \ + cipher_hw_sm4_copyctx \ }; \ const PROV_CIPHER_HW *PROV_CIPHER_HW_sm4_##mode(size_t keybits) \ { \ diff --git a/test/evp_test.c b/test/evp_test.c index 1039c2131a..43d6c48e84 100644 --- a/test/evp_test.c +++ b/test/evp_test.c @@ -621,12 +621,15 @@ static int cipher_test_enc(EVP_TEST *t, int enc, unsigned char *in, *expected_out, *tmp = NULL; size_t in_len, out_len, donelen = 0; int ok = 0, tmplen, chunklen, tmpflen, i; + EVP_CIPHER_CTX *ctx_base = NULL; EVP_CIPHER_CTX *ctx = NULL; t->err = "TEST_FAILURE"; + if (!TEST_ptr(ctx_base = EVP_CIPHER_CTX_new())) + goto err; if (!TEST_ptr(ctx = EVP_CIPHER_CTX_new())) goto err; - EVP_CIPHER_CTX_set_flags(ctx, EVP_CIPHER_CTX_FLAG_WRAP_ALLOW); + EVP_CIPHER_CTX_set_flags(ctx_base, EVP_CIPHER_CTX_FLAG_WRAP_ALLOW); if (enc) { in = expected->plaintext; in_len = expected->plaintext_len; @@ -663,18 +666,18 @@ static int cipher_test_enc(EVP_TEST *t, int enc, in = memcpy(tmp + out_misalign + in_len + 2 * EVP_MAX_BLOCK_LENGTH + inp_misalign, in, in_len); } - if (!EVP_CipherInit_ex(ctx, expected->cipher, NULL, NULL, NULL, enc)) { + if (!EVP_CipherInit_ex(ctx_base, expected->cipher, NULL, NULL, NULL, enc)) { t->err = "CIPHERINIT_ERROR"; goto err; } if (expected->iv) { if (expected->aead) { - if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_IVLEN, + if (!EVP_CIPHER_CTX_ctrl(ctx_base, EVP_CTRL_AEAD_SET_IVLEN, expected->iv_len, 0)) { t->err = "INVALID_IV_LENGTH"; goto err; } - } else if (expected->iv_len != (size_t)EVP_CIPHER_CTX_iv_length(ctx)) { + } else if (expected->iv_len != (size_t)EVP_CIPHER_CTX_iv_length(ctx_base)) { t->err = "INVALID_IV_LENGTH"; goto err; } @@ -693,7 +696,7 @@ static int cipher_test_enc(EVP_TEST *t, int enc, tag = expected->tag; } if (tag || expected->aead != EVP_CIPH_GCM_MODE) { - if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG, + if (!EVP_CIPHER_CTX_ctrl(ctx_base, EVP_CTRL_AEAD_SET_TAG, expected->tag_len, tag)) goto err; } @@ -702,25 +705,25 @@ static int cipher_test_enc(EVP_TEST *t, int enc, if (expected->rounds > 0) { int rounds = (int)expected->rounds; - if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_SET_RC5_ROUNDS, rounds, NULL)) { + if (!EVP_CIPHER_CTX_ctrl(ctx_base, EVP_CTRL_SET_RC5_ROUNDS, rounds, NULL)) { t->err = "INVALID_ROUNDS"; goto err; } } - if (!EVP_CIPHER_CTX_set_key_length(ctx, expected->key_len)) { + if (!EVP_CIPHER_CTX_set_key_length(ctx_base, expected->key_len)) { t->err = "INVALID_KEY_LENGTH"; goto err; } if (expected->key_bits > 0) { int bits = (int)expected->key_bits; - if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_SET_RC2_KEY_BITS, bits, NULL)) { + if (!EVP_CIPHER_CTX_ctrl(ctx_base, EVP_CTRL_SET_RC2_KEY_BITS, bits, NULL)) { t->err = "INVALID KEY BITS"; goto err; } } - if (!EVP_CipherInit_ex(ctx, NULL, NULL, expected->key, expected->iv, -1)) { + if (!EVP_CipherInit_ex(ctx_base, NULL, NULL, expected->key, expected->iv, -1)) { t->err = "KEY_SET_ERROR"; goto err; } @@ -729,11 +732,20 @@ static int cipher_test_enc(EVP_TEST *t, int enc, if (expected->iv != NULL && (EVP_CIPHER_flags(expected->cipher) & EVP_CIPH_CUSTOM_IV) == 0 && !TEST_mem_eq(expected->iv, expected->iv_len, - EVP_CIPHER_CTX_iv(ctx), expected->iv_len)) { + EVP_CIPHER_CTX_iv(ctx_base), expected->iv_len)) { t->err = "INVALID_IV"; goto err; } + /* Test that the cipher dup functions correctly if it is supported */ + if (EVP_CIPHER_CTX_copy(ctx, ctx_base)) { + EVP_CIPHER_CTX_free(ctx_base); + ctx_base = NULL; + } else { + EVP_CIPHER_CTX_free(ctx); + ctx = ctx_base; + } + if (expected->aead == EVP_CIPH_CCM_MODE) { if (!EVP_CipherUpdate(ctx, NULL, &tmplen, NULL, out_len)) { t->err = "CCM_PLAINTEXT_LENGTH_SET_ERROR"; @@ -840,6 +852,8 @@ static int cipher_test_enc(EVP_TEST *t, int enc, ok = 1; err: OPENSSL_free(tmp); + if (ctx != ctx_base) + EVP_CIPHER_CTX_free(ctx_base); EVP_CIPHER_CTX_free(ctx); return ok; } -- 2.25.1