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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1729074022; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=84N2rxqupBUcdaTpHle3WoL4A06cF9MmgU6vQgWoN4s=; b=FQzWM2O9cxTWxM4QMdKQrojldRQMYCbKpIYSz8Sh/btq1f47pvaad8OhHJq/fOSg4uhvj0 FrDhF7GsM6XWxPsdHWVGeWE5/NG6qOkici+vM7kd/pymMb0oYLD5i6fnRWyWLy/p0sxz1U 6SVpfvebpXtFSo+e7Qd6AufkjVgk2uU= X-MC-Unique: ciYjrZ9_OGGlpxXyZrz92g-1 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Dorjoy Chowdhury Subject: [PATCH v2 1/3] crypto/hash: avoid overwriting user supplied result pointer Date: Wed, 16 Oct 2024 11:20:04 +0100 Message-ID: <20241016102006.480218-2-berrange@redhat.com> In-Reply-To: <20241016102006.480218-1-berrange@redhat.com> References: <20241016102006.480218-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 12 X-Spam_score: 1.2 X-Spam_bar: + X-Spam_report: (1.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.063, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_SBL_CSS=3.335, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1729074068642116600 If the user provides a pre-allocated buffer for the hash result, we must use that rather than re-allocating a new buffer. Reported-by: Dorjoy Chowdhury Signed-off-by: Daniel P. Berrang=C3=A9 Reviewed-by: Dorjoy Chowdhury --- crypto/hash-gcrypt.c | 15 ++++++++++++--- crypto/hash-glib.c | 11 +++++++++-- crypto/hash-gnutls.c | 16 +++++++++++++--- crypto/hash-nettle.c | 14 +++++++++++--- 4 files changed, 45 insertions(+), 11 deletions(-) diff --git a/crypto/hash-gcrypt.c b/crypto/hash-gcrypt.c index ccc3cce3f8..73533a4949 100644 --- a/crypto/hash-gcrypt.c +++ b/crypto/hash-gcrypt.c @@ -103,16 +103,25 @@ int qcrypto_gcrypt_hash_finalize(QCryptoHash *hash, size_t *result_len, Error **errp) { + int ret; unsigned char *digest; gcry_md_hd_t *ctx =3D hash->opaque; =20 - *result_len =3D gcry_md_get_algo_dlen(qcrypto_hash_alg_map[hash->alg]); - if (*result_len =3D=3D 0) { + ret =3D gcry_md_get_algo_dlen(qcrypto_hash_alg_map[hash->alg]); + if (ret =3D=3D 0) { error_setg(errp, "Unable to get hash length"); return -1; } =20 - *result =3D g_new(uint8_t, *result_len); + if (*result_len =3D=3D 0) { + *result_len =3D ret; + *result =3D g_new(uint8_t, *result_len); + } else if (*result_len !=3D ret) { + error_setg(errp, + "Result buffer size %zu is smaller than hash %d", + *result_len, ret); + return -1; + } =20 /* Digest is freed by gcry_md_close(), copy it */ digest =3D gcry_md_read(*ctx, 0); diff --git a/crypto/hash-glib.c b/crypto/hash-glib.c index 02a6ec1edf..809cef98ae 100644 --- a/crypto/hash-glib.c +++ b/crypto/hash-glib.c @@ -99,8 +99,15 @@ int qcrypto_glib_hash_finalize(QCryptoHash *hash, return -1; } =20 - *result_len =3D ret; - *result =3D g_new(uint8_t, *result_len); + if (*result_len =3D=3D 0) { + *result_len =3D ret; + *result =3D g_new(uint8_t, *result_len); + } else if (*result_len !=3D ret) { + error_setg(errp, + "Result buffer size %zu is smaller than hash %d", + *result_len, ret); + return -1; + } =20 g_checksum_get_digest(ctx, *result, result_len); return 0; diff --git a/crypto/hash-gnutls.c b/crypto/hash-gnutls.c index 34a63994c9..99fbe824ea 100644 --- a/crypto/hash-gnutls.c +++ b/crypto/hash-gnutls.c @@ -115,14 +115,24 @@ int qcrypto_gnutls_hash_finalize(QCryptoHash *hash, Error **errp) { gnutls_hash_hd_t *ctx =3D hash->opaque; + int ret; =20 - *result_len =3D gnutls_hash_get_len(qcrypto_hash_alg_map[hash->alg]); - if (*result_len =3D=3D 0) { + ret =3D gnutls_hash_get_len(qcrypto_hash_alg_map[hash->alg]); + if (ret =3D=3D 0) { error_setg(errp, "Unable to get hash length"); return -1; } =20 - *result =3D g_new(uint8_t, *result_len); + if (*result_len =3D=3D 0) { + *result_len =3D ret; + *result =3D g_new(uint8_t, *result_len); + } else if (*result_len !=3D ret) { + error_setg(errp, + "Result buffer size %zu is smaller than hash %d", + *result_len, ret); + return -1; + } + gnutls_hash_output(*ctx, *result); return 0; } diff --git a/crypto/hash-nettle.c b/crypto/hash-nettle.c index 3b847aa60e..c78624b347 100644 --- a/crypto/hash-nettle.c +++ b/crypto/hash-nettle.c @@ -150,9 +150,17 @@ int qcrypto_nettle_hash_finalize(QCryptoHash *hash, Error **errp) { union qcrypto_hash_ctx *ctx =3D hash->opaque; - - *result_len =3D qcrypto_hash_alg_map[hash->alg].len; - *result =3D g_new(uint8_t, *result_len); + int ret =3D qcrypto_hash_alg_map[hash->alg].len; + + if (*result_len =3D=3D 0) { + *result_len =3D ret; + *result =3D g_new(uint8_t, *result_len); + } else if (*result_len !=3D ret) { + error_setg(errp, + "Result buffer size %zu is smaller than hash %d", + *result_len, ret); + return -1; + } =20 qcrypto_hash_alg_map[hash->alg].result(ctx, *result_len, *result); =20 --=20 2.46.0 From nobody Tue Oct 22 23:16:27 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1729074085; cv=none; d=zohomail.com; s=zohoarc; b=S/RBi11jre2GaiS8WqkA7DXNHhiN6n/z00K0eGmHw+VBAGKefjuNaz0UPbgw912dpTEa94wzB6yS/WTSktqFctypAb9i16l/XoA8eyjXfo0Kr6g3lwcofp+JaCztAaieMSniPWhYYgjwi5rauPAFZM1hLTxRtIoS9gtPAH1/4ek= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1729074085; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; 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Wed, 16 Oct 2024 10:20:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1729074022; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ENNrYL48iopybgO3xqkXmLRGJM0WPuBI+yVnGuIHfCE=; b=JMw3roCJ7iYIIkK0vIXgm4BgTe0F0jpeiLRvb2ggaQdVeQN4LXKzVFC4m351fALL1uNSZk Wx0fIo1lgOLaliHQekz3FgoWlYfK/UimE4orYdrdVBr50+YryHXmMIM4RtTG6vFbPKNXqv bCgJMQujXu/BeH4ImcbLhLdlO1B/jmI= X-MC-Unique: EKvklxcpO1uBPYe6PD3gMA-1 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Dorjoy Chowdhury Subject: [PATCH v2 2/3] tests: correctly validate result buffer in hash/hmac tests Date: Wed, 16 Oct 2024 11:20:05 +0100 Message-ID: <20241016102006.480218-3-berrange@redhat.com> In-Reply-To: <20241016102006.480218-1-berrange@redhat.com> References: <20241016102006.480218-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 12 X-Spam_score: 1.2 X-Spam_bar: + X-Spam_report: (1.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.063, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_SBL_CSS=3.335, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1729074086678116600 Validate that the pre-allocated buffer pointer was not overwritten by the hash/hmac APIs. Signed-off-by: Daniel P. Berrang=C3=A9 Reviewed-by: Dorjoy Chowdhury --- tests/unit/test-crypto-hash.c | 7 ++++--- tests/unit/test-crypto-hmac.c | 6 ++++-- 2 files changed, 8 insertions(+), 5 deletions(-) diff --git a/tests/unit/test-crypto-hash.c b/tests/unit/test-crypto-hash.c index e5829ca766..76c4699c15 100644 --- a/tests/unit/test-crypto-hash.c +++ b/tests/unit/test-crypto-hash.c @@ -123,7 +123,7 @@ static void test_hash_prealloc(void) size_t i; =20 for (i =3D 0; i < G_N_ELEMENTS(expected_outputs) ; i++) { - uint8_t *result; + uint8_t *result, *origresult; size_t resultlen; int ret; size_t j; @@ -133,7 +133,7 @@ static void test_hash_prealloc(void) } =20 resultlen =3D expected_lens[i]; - result =3D g_new0(uint8_t, resultlen); + origresult =3D result =3D g_new0(uint8_t, resultlen); =20 ret =3D qcrypto_hash_bytes(i, INPUT_TEXT, @@ -142,7 +142,8 @@ static void test_hash_prealloc(void) &resultlen, &error_fatal); g_assert(ret =3D=3D 0); - + /* Validate that our pre-allocated pointer was not replaced */ + g_assert(result =3D=3D origresult); g_assert(resultlen =3D=3D expected_lens[i]); for (j =3D 0; j < resultlen; j++) { g_assert(expected_outputs[i][j * 2] =3D=3D hex[(result[j] >> 4= ) & 0xf]); diff --git a/tests/unit/test-crypto-hmac.c b/tests/unit/test-crypto-hmac.c index 3fa50f24bb..cdb8774443 100644 --- a/tests/unit/test-crypto-hmac.c +++ b/tests/unit/test-crypto-hmac.c @@ -126,7 +126,7 @@ static void test_hmac_prealloc(void) for (i =3D 0; i < G_N_ELEMENTS(test_data); i++) { QCryptoHmacTestData *data =3D &test_data[i]; QCryptoHmac *hmac =3D NULL; - uint8_t *result =3D NULL; + uint8_t *result =3D NULL, *origresult =3D NULL; size_t resultlen =3D 0; const char *exp_output =3D NULL; int ret; @@ -139,7 +139,7 @@ static void test_hmac_prealloc(void) exp_output =3D data->hex_digest; =20 resultlen =3D strlen(exp_output) / 2; - result =3D g_new0(uint8_t, resultlen); + origresult =3D result =3D g_new0(uint8_t, resultlen); =20 hmac =3D qcrypto_hmac_new(data->alg, (const uint8_t *)KEY, strlen(KEY), &error_fatal); @@ -149,6 +149,8 @@ static void test_hmac_prealloc(void) strlen(INPUT_TEXT), &result, &resultlen, &error_fatal); g_assert(ret =3D=3D 0); + /* Validate that our pre-allocated pointer was not replaced */ + g_assert(result =3D=3D origresult); =20 exp_output =3D data->hex_digest; for (j =3D 0; j < resultlen; j++) { --=20 2.46.0 From nobody Tue Oct 22 23:16:27 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1729074111; cv=none; d=zohomail.com; s=zohoarc; b=Zns/XP5HHEEyJpTea7FWGIpZeZ/7N4WsKXsCem5iz4Uh6U3n+tVEHBCej0LW/3WGD1/Jtw4oNJ9Txk+tnJvHpwUsMRbxHv/Gp9GtNMbkv3g/FqOj6EOuEggI3KgNDWl4lTDM8rd2+87zEpowPyZhLHNo3Oae+vgpHiqjOUTvz7I= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1729074111; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; 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Wed, 16 Oct 2024 10:20:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1729074022; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=/77uZabxQYbI+7iElg+IwhYCsa5tCIzuO6b18O5VOLc=; b=gz2a4VKnbCBk31HqH/rA7sF4pcp8UyhfUJgdMIaMeaNfMa/8xDHizNR36W9Kj3W+UrYcx8 ZPLJUcOKixIbTDCohXgbP8aRYwDAjeDl1KQ32W7lC1sQ6uM4LU8DE/3jIPZa0qZwXKBVqx mcPnB/J3Ged9QvdRkN9Kx2wuhvksh/Q= X-MC-Unique: VbpXEhBwNMG7mvogCtXhDA-1 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Dorjoy Chowdhury Subject: [PATCH v2 3/3] include/crypto: clarify @result/@result_len for hash/hmac APIs Date: Wed, 16 Oct 2024 11:20:06 +0100 Message-ID: <20241016102006.480218-4-berrange@redhat.com> In-Reply-To: <20241016102006.480218-1-berrange@redhat.com> References: <20241016102006.480218-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 12 X-Spam_score: 1.2 X-Spam_bar: + X-Spam_report: (1.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.063, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_SBL_CSS=3.335, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1729074112686116600 The @result parameter passed to hash/hmac APIs may either contain a pre-allocated buffer, or a buffer can be allocated on the fly. Clarify these two different usage models in the API docs. Signed-off-by: Daniel P. Berrang=C3=A9 Reviewed-by: Dorjoy Chowdhury --- include/crypto/hash.h | 30 +++++++++++++++++++++++------- include/crypto/hmac.h | 17 ++++++++++++----- 2 files changed, 35 insertions(+), 12 deletions(-) diff --git a/include/crypto/hash.h b/include/crypto/hash.h index b791ca92a4..317bf9ecde 100644 --- a/include/crypto/hash.h +++ b/include/crypto/hash.h @@ -98,11 +98,18 @@ int qcrypto_hash_bytesv(QCryptoHashAlgo alg, * @errp: pointer to a NULL-initialized error object * * Computes the hash across all the memory region - * @buf of length @len. The @result pointer will be - * filled with raw bytes representing the computed - * hash, which will have length @resultlen. The - * memory pointer in @result must be released - * with a call to g_free() when no longer required. + * @buf of length @len. + * + * If @result_len is set to a non-zero value by the caller, then + * @result must hold a pointer that is @result_len in size, and + * @result_len match the size of the hash output. The digest will + * be written into @result. + * + * If @result_len is set to zero, then this function will allocate + * a buffer to hold the hash output digest, storing a pointer to + * the buffer in @result, and setting @result_len to its size. + * The memory referenced in @result must be released with a call + * to g_free() when no longer required by the caller. * * Returns: 0 on success, -1 on error */ @@ -215,8 +222,17 @@ int qcrypto_hash_finalize_base64(QCryptoHash *hash, * * Computes the hash from the given hash object. Hash object * is expected to have it's data updated from the qcrypto_hash_update func= tion. - * The memory pointer in @result must be released with a call to g_free() - * when no longer required. + * + * If @result_len is set to a non-zero value by the caller, then + * @result must hold a pointer that is @result_len in size, and + * @result_len match the size of the hash output. The digest will + * be written into @result. + * + * If @result_len is set to zero, then this function will allocate + * a buffer to hold the hash output digest, storing a pointer to + * the buffer in @result, and setting @result_len to its size. + * The memory referenced in @result must be released with a call + * to g_free() when no longer required by the caller. * * Returns: 0 on success, -1 on error */ diff --git a/include/crypto/hmac.h b/include/crypto/hmac.h index c69a0dfab3..aaff95f7db 100644 --- a/include/crypto/hmac.h +++ b/include/crypto/hmac.h @@ -103,11 +103,18 @@ int qcrypto_hmac_bytesv(QCryptoHmac *hmac, * @errp: pointer to a NULL-initialized error object * * Computes the hmac across all the memory region - * @buf of length @len. The @result pointer will be - * filled with raw bytes representing the computed - * hmac, which will have length @resultlen. The - * memory pointer in @result must be released - * with a call to g_free() when no longer required. + * @buf of length @len. + * + * If @result_len is set to a non-zero value by the caller, then + * @result must hold a pointer that is @result_len in size, and + * @result_len match the size of the hash output. The digest will + * be written into @result. + * + * If @result_len is set to zero, then this function will allocate + * a buffer to hold the hash output digest, storing a pointer to + * the buffer in @result, and setting @result_len to its size. + * The memory referenced in @result must be released with a call + * to g_free() when no longer required by the caller. * * Returns: * 0 on success, -1 on error --=20 2.46.0