From patchwork Thu May 23 21:25:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 13672289 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 81E35127E1E; Thu, 23 May 2024 21:25:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716499538; cv=none; b=Ob4GmAPwS+Ptj6Rs7SrgTuLgs9vFYFrrpv0ojpxVNPaQGyUpmxjMb4JidScSmkvdpGGlayarbG+ctjCb4SjNJP/darJaPbh/goJy1ONRX9oUItmDFqEHguor4dv3Cla2cLWscFLZB8K+aCBtbNtJO48SXNreZmie0LN5Nv9N27U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716499538; c=relaxed/simple; bh=8w2R7LxXVwCwXzmn1yD7XQlkiioI7WCXLhZs2JoEKiY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=EFvx3U4Cd4FL/kMMK9YzEw/1YVGabqf8IbXtEDEYW3KsskW7lT+S/tR8P5P+gE7svT77GJjGq8Qk0ZYQ1DnW9RAuxlE+v6l9SP2SWgSEbTVxi+gIenbQMwc3YEyhyQKXq5j+Hn7b58kJ111QYVhJuXayFcQGAnThk5+T2ZFOORk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=k2Z/bDs2; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="k2Z/bDs2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9202FC2BD10; Thu, 23 May 2024 21:25:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1716499538; bh=8w2R7LxXVwCwXzmn1yD7XQlkiioI7WCXLhZs2JoEKiY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=k2Z/bDs2Vr1xUrg0P2uMWS7g0yM/sViYwrDpmOZxW3DiZmHHKEwu/1hWv11HXSKuk ri1QujsB8ppmQAPUETs/3SftC/zg9RgeMvcIOTga4ErjcRTf3tw5fAYGEeev480FbI THqndYm/cIf+aDUv5pZecrhw/Fo52UbRzoMAh0UGeLcI88jZpwb0ysggaQTTyqcKo2 5BKE6N7p+m72hERFRH/PzJsn/8Xz2o+cSwAnhqBWrMFCLmD1pIz2qxX8ldbMnjs4ix F+WNVQE0q4j4qWT/8Mj9Xl8MB/S4jclruSZo7xeQhNXJNqQIbfWpBUOTRNWzWgo7Gu AX3UzCWRSJ1gw== From: Jarkko Sakkinen To: Herbert Xu Cc: linux-integrity@vger.kernel.org, keyrings@vger.kernel.org, Andreas.Fuchs@infineon.com, James Prestwood , David Woodhouse , Eric Biggers , James Bottomley , linux-crypto@vger.kernel.org, Jarkko Sakkinen , "David S. Miller" , linux-kernel@vger.kernel.org (open list), Peter Huewe , Jason Gunthorpe , James Bottomley , Mimi Zohar , David Howells , Paul Moore , James Morris , "Serge E. Hallyn" , linux-security-module@vger.kernel.org (open list:SECURITY SUBSYSTEM) Subject: [PATCH v5 3/5] KEYS: trusted: Move tpm2_key_decode() to the TPM driver Date: Fri, 24 May 2024 00:25:04 +0300 Message-ID: <20240523212515.4875-4-jarkko@kernel.org> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240523212515.4875-1-jarkko@kernel.org> References: <20240523212515.4875-1-jarkko@kernel.org> Precedence: bulk X-Mailing-List: linux-integrity@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Move tpm2_key_decode() to the TPM driver and export the symbols to make them callable from trusted keys. It can re-used for asymmetric keys. Signed-off-by: Jarkko Sakkinen --- v2: Do not allocate blob twice. Use the one inside struct tpm2_key. --- drivers/char/tpm/Kconfig | 1 + drivers/char/tpm/Makefile | 5 + drivers/char/tpm/tpm2_key.c | 111 +++++++++++++++ .../char/tpm}/tpm2key.asn1 | 0 include/crypto/tpm2_key.h | 33 +++++ security/keys/trusted-keys/Makefile | 2 - security/keys/trusted-keys/trusted_tpm2.c | 127 +++--------------- 7 files changed, 167 insertions(+), 112 deletions(-) create mode 100644 drivers/char/tpm/tpm2_key.c rename {security/keys/trusted-keys => drivers/char/tpm}/tpm2key.asn1 (100%) create mode 100644 include/crypto/tpm2_key.h diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig index e63a6a17793c..de2f4093c939 100644 --- a/drivers/char/tpm/Kconfig +++ b/drivers/char/tpm/Kconfig @@ -7,6 +7,7 @@ menuconfig TCG_TPM tristate "TPM Hardware Support" depends on HAS_IOMEM imply SECURITYFS + select ASN1 select CRYPTO select CRYPTO_HASH_INFO help diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile index 4c695b0388f3..071437058ef6 100644 --- a/drivers/char/tpm/Makefile +++ b/drivers/char/tpm/Makefile @@ -17,6 +17,11 @@ tpm-y += eventlog/tpm1.o tpm-y += eventlog/tpm2.o tpm-y += tpm-buf.o +# TPM2 Asymmetric Key +$(obj)/trusted_tpm2.o: $(obj)/tpm2key.asn1.h +tpm-y += tpm2key.asn1.o +tpm-y += tpm2_key.o + tpm-$(CONFIG_TCG_TPM2_HMAC) += tpm2-sessions.o tpm-$(CONFIG_ACPI) += tpm_ppi.o eventlog/acpi.o tpm-$(CONFIG_EFI) += eventlog/efi.o diff --git a/drivers/char/tpm/tpm2_key.c b/drivers/char/tpm/tpm2_key.c new file mode 100644 index 000000000000..7662b2cb85bf --- /dev/null +++ b/drivers/char/tpm/tpm2_key.c @@ -0,0 +1,111 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include +#include +#include +#include +#include +#include "tpm2key.asn1.h" + +#undef pr_fmt +#define pr_fmt(fmt) "tpm2_key: "fmt + +int tpm2_key_parent(void *context, size_t hdrlen, + unsigned char tag, + const void *value, size_t vlen) +{ + struct tpm2_key *ctx = context; + const u8 *v = value; + int i; + + ctx->parent = 0; + for (i = 0; i < vlen; i++) { + ctx->parent <<= 8; + ctx->parent |= v[i]; + } + + return 0; +} + +int tpm2_key_type(void *context, size_t hdrlen, + unsigned char tag, + const void *value, size_t vlen) +{ + enum OID oid = look_up_OID(value, vlen); + + if (oid != OID_TPMSealedData) { + char buffer[50]; + + sprint_oid(value, vlen, buffer, sizeof(buffer)); + pr_debug("OID is \"%s\" which is not TPMSealedData\n", + buffer); + return -EINVAL; + } + + return 0; +} + +int tpm2_key_pub(void *context, size_t hdrlen, + unsigned char tag, + const void *value, size_t vlen) +{ + struct tpm2_key *ctx = context; + + ctx->pub = value; + ctx->pub_len = vlen; + + return 0; +} + +int tpm2_key_priv(void *context, size_t hdrlen, + unsigned char tag, + const void *value, size_t vlen) +{ + struct tpm2_key *ctx = context; + + ctx->priv = value; + ctx->priv_len = vlen; + + return 0; +} + +/** + * tpm_key_decode() - Decode TPM2 ASN.1 key. + * @src: ASN.1 source. + * @src_len: ASN.1 source length. + * @key: TPM2 asymmetric key. + * @max_key_len: Cap the maximum length for the blob allocation. + * + * Decodes TPM2 ASN.1 key on success. Returns POSIX error code on failure. + */ +int tpm2_key_decode(const u8 *src, u32 src_len, struct tpm2_key *key, + u32 max_key_len) +{ + struct tpm2_key ctx; + u32 blob_len; + int ret; + + memset(&ctx, 0, sizeof(ctx)); + + ret = asn1_ber_decoder(&tpm2key_decoder, &ctx, src, src_len); + if (ret < 0) + return ret; + + blob_len = ctx.priv_len + ctx.pub_len; + if (blob_len > max_key_len) + return -E2BIG; + + ctx.blob_len = blob_len; + ctx.blob = kmalloc(blob_len, GFP_KERNEL); + if (!ctx.blob) + return -ENOMEM; + + memcpy((void *)ctx.blob, ctx.priv, ctx.priv_len); + memcpy((void *)ctx.blob + ctx.priv_len, ctx.pub, ctx.pub_len); + ctx.priv = ctx.blob; + ctx.pub = ctx.blob + ctx.priv_len; + + memcpy(key, &ctx, sizeof(ctx)); + return 0; +} +EXPORT_SYMBOL_GPL(tpm2_key_decode); diff --git a/security/keys/trusted-keys/tpm2key.asn1 b/drivers/char/tpm/tpm2key.asn1 similarity index 100% rename from security/keys/trusted-keys/tpm2key.asn1 rename to drivers/char/tpm/tpm2key.asn1 diff --git a/include/crypto/tpm2_key.h b/include/crypto/tpm2_key.h new file mode 100644 index 000000000000..acf41b2e0c92 --- /dev/null +++ b/include/crypto/tpm2_key.h @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef __LINUX_TPM2_KEY_H__ +#define __LINUX_TPM2_KEY_H__ + +#include + +/* + * TPM2 ASN.1 key + */ +struct tpm2_key { + u32 parent; + const u8 *blob; + u32 blob_len; + const u8 *pub; + u32 pub_len; + const u8 *priv; + u32 priv_len; +}; + +int tpm2_key_decode(const u8 *src, u32 src_len, struct tpm2_key *key, + u32 max_key_len); + +/** + * tpm2_key_free() - Release TPM2 asymmetric key resources and reset values + * @key: TPM2 asymmetric key. + */ +static inline void tpm2_key_destroy(struct tpm2_key *key) +{ + kfree(key->blob); + memset(key, 0, sizeof(*key)); +} + +#endif /* __LINUX_TPM2_KEY_H__ */ diff --git a/security/keys/trusted-keys/Makefile b/security/keys/trusted-keys/Makefile index f0f3b27f688b..2674d5c10fc9 100644 --- a/security/keys/trusted-keys/Makefile +++ b/security/keys/trusted-keys/Makefile @@ -7,9 +7,7 @@ obj-$(CONFIG_TRUSTED_KEYS) += trusted.o trusted-y += trusted_core.o trusted-$(CONFIG_TRUSTED_KEYS_TPM) += trusted_tpm1.o -$(obj)/trusted_tpm2.o: $(obj)/tpm2key.asn1.h trusted-$(CONFIG_TRUSTED_KEYS_TPM) += trusted_tpm2.o -trusted-$(CONFIG_TRUSTED_KEYS_TPM) += tpm2key.asn1.o trusted-$(CONFIG_TRUSTED_KEYS_TEE) += trusted_tee.o diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c index 7317e07440c3..e0bd1a2fc2ca 100644 --- a/security/keys/trusted-keys/trusted_tpm2.c +++ b/security/keys/trusted-keys/trusted_tpm2.c @@ -13,11 +13,10 @@ #include #include +#include #include -#include "tpm2key.asn1.h" - static struct tpm2_hash tpm2_hash_map[] = { {HASH_ALGO_SHA1, TPM_ALG_SHA1}, {HASH_ALGO_SHA256, TPM_ALG_SHA256}, @@ -28,9 +27,9 @@ static struct tpm2_hash tpm2_hash_map[] = { static const u8 OID_TPMSealedData_ASN1[] = {0x06, 0x06, 0x67, 0x81, 0x05, 0x0a, 0x01, 0x05}; -static int tpm2_key_encode(struct trusted_key_payload *payload, - struct trusted_key_options *options, - u8 *src, u32 len) +static int tpm2_trusted_key_encode(struct trusted_key_payload *payload, + struct trusted_key_options *options, + u8 *src, u32 len) { const int SCRATCH_SIZE = PAGE_SIZE; u8 *scratch = kmalloc(SCRATCH_SIZE, GFP_KERNEL); @@ -98,106 +97,6 @@ static int tpm2_key_encode(struct trusted_key_payload *payload, return ret; } -struct tpm2_key_context { - u32 parent; - const u8 *pub; - u32 pub_len; - const u8 *priv; - u32 priv_len; -}; - -static int tpm2_key_decode(struct trusted_key_payload *payload, - struct trusted_key_options *options, - u8 **buf) -{ - int ret; - struct tpm2_key_context ctx; - u8 *blob; - - memset(&ctx, 0, sizeof(ctx)); - - ret = asn1_ber_decoder(&tpm2key_decoder, &ctx, payload->blob, - payload->blob_len); - if (ret < 0) - return ret; - - if (ctx.priv_len + ctx.pub_len > MAX_BLOB_SIZE) - return -E2BIG; - - blob = kmalloc(ctx.priv_len + ctx.pub_len + 4, GFP_KERNEL); - if (!blob) - return -ENOMEM; - - *buf = blob; - options->keyhandle = ctx.parent; - - memcpy(blob, ctx.priv, ctx.priv_len); - blob += ctx.priv_len; - - memcpy(blob, ctx.pub, ctx.pub_len); - - return 0; -} - -int tpm2_key_parent(void *context, size_t hdrlen, - unsigned char tag, - const void *value, size_t vlen) -{ - struct tpm2_key_context *ctx = context; - const u8 *v = value; - int i; - - ctx->parent = 0; - for (i = 0; i < vlen; i++) { - ctx->parent <<= 8; - ctx->parent |= v[i]; - } - - return 0; -} - -int tpm2_key_type(void *context, size_t hdrlen, - unsigned char tag, - const void *value, size_t vlen) -{ - enum OID oid = look_up_OID(value, vlen); - - if (oid != OID_TPMSealedData) { - char buffer[50]; - - sprint_oid(value, vlen, buffer, sizeof(buffer)); - pr_debug("OID is \"%s\" which is not TPMSealedData\n", - buffer); - return -EINVAL; - } - - return 0; -} - -int tpm2_key_pub(void *context, size_t hdrlen, - unsigned char tag, - const void *value, size_t vlen) -{ - struct tpm2_key_context *ctx = context; - - ctx->pub = value; - ctx->pub_len = vlen; - - return 0; -} - -int tpm2_key_priv(void *context, size_t hdrlen, - unsigned char tag, - const void *value, size_t vlen) -{ - struct tpm2_key_context *ctx = context; - - ctx->priv = value; - ctx->priv_len = vlen; - - return 0; -} - /** * tpm2_buf_append_auth() - append TPMS_AUTH_COMMAND to the buffer. * @@ -347,7 +246,8 @@ int tpm2_seal_trusted(struct tpm_chip *chip, goto out; } - blob_len = tpm2_key_encode(payload, options, &buf.data[offset], blob_len); + blob_len = tpm2_trusted_key_encode(payload, options, &buf.data[offset], + blob_len); out: tpm_buf_destroy(&sized); @@ -387,21 +287,27 @@ static int tpm2_load_cmd(struct tpm_chip *chip, struct trusted_key_options *options, u32 *blob_handle) { - struct tpm_buf buf; unsigned int private_len; unsigned int public_len; unsigned int blob_len; - u8 *blob, *pub; + struct tpm2_key key; + struct tpm_buf buf; + const u8 *blob, *pub; int rc; u32 attrs; - rc = tpm2_key_decode(payload, options, &blob); + rc = tpm2_key_decode(payload->blob, payload->blob_len, &key, PAGE_SIZE); if (rc) { /* old form */ blob = payload->blob; payload->old_format = 1; + } else { + blob = key.blob; } + if (!blob) + return -ENOMEM; + /* new format carries keyhandle but old format doesn't */ if (!options->keyhandle) return -EINVAL; @@ -465,7 +371,8 @@ static int tpm2_load_cmd(struct tpm_chip *chip, out: if (blob != payload->blob) - kfree(blob); + tpm2_key_destroy(&key); + tpm_buf_destroy(&buf); if (rc > 0)