crypto: digital signature verification support (051dbb91) · Commits · e / devices / android_kernel_xiaomi_markw

Documentation/digsig.txt

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		Digital Signature Verification API

		CONTENTS

		1. Introduction
		2. API
		3. User-space utilities


		1. Introduction

		Digital signature verification API provides a method to verify digital signature.
		Currently digital signatures are used by the IMA/EVM integrity protection subsystem.

		Digital signature verification is implemented using cut-down kernel port of
		GnuPG multi-precision integers (MPI) library. The kernel port provides
		memory allocation errors handling, has been refactored according to kernel
		coding style, and checkpatch.pl reported errors and warnings have been fixed.

		Public key and signature consist of header and MPIs.

		struct pubkey_hdr {
		uint8_t version; /* key format version */
		time_t timestamp; /* key made, always 0 for now */
		uint8_t algo;
		uint8_t nmpi;
		char mpi[0];
		} __packed;

		struct signature_hdr {
		uint8_t version; /* signature format version */
		time_t timestamp; /* signature made */
		uint8_t algo;
		uint8_t hash;
		uint8_t keyid[8];
		uint8_t nmpi;
		char mpi[0];
		} __packed;

		keyid equals to SHA1[12-19] over the total key content.
		Signature header is used as an input to generate a signature.
		Such approach insures that key or signature header could not be changed.
		It protects timestamp from been changed and can be used for rollback
		protection.

		2. API

		API currently includes only 1 function:

		digsig_verify() - digital signature verification with public key


		/**
		* digsig_verify() - digital signature verification with public key
		* @keyring: keyring to search key in
		* @sig: digital signature
		* @sigen: length of the signature
		* @data: data
		* @datalen: length of the data
		* @return: 0 on success, -EINVAL otherwise
		*
		* Verifies data integrity against digital signature.
		* Currently only RSA is supported.
		* Normally hash of the content is used as a data for this function.
		*
		*/
		int digsig_verify(struct key keyring, const char sig, int siglen,
		const char *data, int datalen);

		3. User-space utilities

		The signing and key management utilities evm-utils provide functionality
		to generate signatures, to load keys into the kernel keyring.
		Keys can be in PEM or converted to the kernel format.
		When the key is added to the kernel keyring, the keyid defines the name
		of the key: 5D2B05FC633EE3E8 in the example bellow.

		Here is example output of the keyctl utility.

		$ keyctl show
		Session Keyring
		-3 --alswrv 0 0 keyring: _ses
		603976250 --alswrv 0 -1 \_ keyring: _uid.0
		817777377 --alswrv 0 0 \_ user: kmk
		891974900 --alswrv 0 0 \_ encrypted: evm-key
		170323636 --alswrv 0 0 \_ keyring: _module
		548221616 --alswrv 0 0 \_ keyring: _ima
		128198054 --alswrv 0 0 \_ keyring: _evm

		$ keyctl list 128198054
		1 key in keyring:
		620789745: --alswrv 0 0 user: 5D2B05FC633EE3E8


		Dmitry Kasatkin
		06.10.2011

include/linux/digsig.h

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		/*
		* Copyright (C) 2011 Nokia Corporation
		* Copyright (C) 2011 Intel Corporation
		*
		* Author:
		* Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
		* <dmitry.kasatkin@intel.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation, version 2 of the License.
		*
		*/

		#ifndef _DIGSIG_H
		#define _DIGSIG_H

		#include <linux/key.h>

		enum pubkey_algo {
		PUBKEY_ALGO_RSA,
		PUBKEY_ALGO_MAX,
		};

		enum digest_algo {
		DIGEST_ALGO_SHA1,
		DIGEST_ALGO_SHA256,
		DIGEST_ALGO_MAX
		};

		struct pubkey_hdr {
		uint8_t version; /* key format version */
		time_t timestamp; /* key made, always 0 for now */
		uint8_t algo;
		uint8_t nmpi;
		char mpi[0];
		} __packed;

		struct signature_hdr {
		uint8_t version; /* signature format version */
		time_t timestamp; /* signature made */
		uint8_t algo;
		uint8_t hash;
		uint8_t keyid[8];
		uint8_t nmpi;
		char mpi[0];
		} __packed;

		#if defined(CONFIG_DIGSIG) \|\| defined(CONFIG_DIGSIG_MODULE)

		int digsig_verify(struct key keyring, const char sig, int siglen,
		const char *digest, int digestlen);

		#else

		static inline int digsig_verify(struct key keyring, const char sig,
		int siglen, const char *digest, int digestlen)
		{
		return -EOPNOTSUPP;
		}

		#endif /* CONFIG_DIGSIG */

		#endif /* _DIGSIG_H */

lib/Kconfig

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		@@ -293,4 +293,12 @@ config MPILIB_EXTRA
		This code in unnecessary for RSA digital signature verification,
		and can be compiled if needed.

		config DIGSIG
		tristate "In-kernel signature checker"
		depends on CRYPTO
		select MPILIB
		help
		Digital signature verification. Currently only RSA is supported.
		Implementation is done using GnuPG MPI library

		endmenu

lib/Makefile

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		@@ -116,6 +116,7 @@ obj-$(CONFIG_CPU_RMAP) += cpu_rmap.o
		obj-$(CONFIG_CORDIC) += cordic.o

		obj-$(CONFIG_MPILIB) += mpi/
		obj-$(CONFIG_DIGSIG) += digsig.o

		hostprogs-y := gen_crc32table
		clean-files := crc32table.h

lib/digsig.c

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		/*
		* Copyright (C) 2011 Nokia Corporation
		* Copyright (C) 2011 Intel Corporation
		*
		* Author:
		* Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
		* <dmitry.kasatkin@intel.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation, version 2 of the License.
		*
		* File: sign.c
		* implements signature (RSA) verification
		* pkcs decoding is based on LibTomCrypt code
		*/

		#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

		#include <linux/err.h>
		#include <linux/module.h>
		#include <linux/slab.h>
		#include <linux/key.h>
		#include <linux/crypto.h>
		#include <crypto/hash.h>
		#include <crypto/sha.h>
		#include <keys/user-type.h>
		#include <linux/mpi.h>
		#include <linux/digsig.h>

		static struct crypto_shash *shash;

		static int pkcs_1_v1_5_decode_emsa(const unsigned char *msg,
		unsigned long msglen,
		unsigned long modulus_bitlen,
		unsigned char *out,
		unsigned long *outlen,
		int *is_valid)
		{
		unsigned long modulus_len, ps_len, i;
		int result;

		/* default to invalid packet */
		*is_valid = 0;

		modulus_len = (modulus_bitlen >> 3) + (modulus_bitlen & 7 ? 1 : 0);

		/* test message size */
		if ((msglen > modulus_len) \|\| (modulus_len < 11))
		return -EINVAL;

		/* separate encoded message */
		if ((msg[0] != 0x00) \|\| (msg[1] != (unsigned char)1)) {
		result = -EINVAL;
		goto bail;
		}

		for (i = 2; i < modulus_len - 1; i++)
		if (msg[i] != 0xFF)
		break;

		/* separator check */
		if (msg[i] != 0) {
		/* There was no octet with hexadecimal value 0x00
		to separate ps from m. */
		result = -EINVAL;
		goto bail;
		}

		ps_len = i - 2;

		if (*outlen < (msglen - (2 + ps_len + 1))) {
		*outlen = msglen - (2 + ps_len + 1);
		result = -EOVERFLOW;
		goto bail;
		}

		*outlen = (msglen - (2 + ps_len + 1));
		memcpy(out, &msg[2 + ps_len + 1], *outlen);

		/* valid packet */
		*is_valid = 1;
		result = 0;
		bail:
		return result;
		}

		/*
		* RSA Signature verification with public key
		*/
		static int digsig_verify_rsa(struct key *key,
		const char *sig, int siglen,
		const char *h, int hlen)
		{
		int err = -EINVAL;
		unsigned long len;
		unsigned long mlen, mblen;
		unsigned nret, l;
		int valid, head, i;
		unsigned char out1 = NULL, out2 = NULL;
		MPI in = NULL, res = NULL, pkey[2];
		uint8_t p, datap, *endp;
		struct user_key_payload *ukp;
		struct pubkey_hdr *pkh;

		down_read(&key->sem);
		ukp = key->payload.data;
		pkh = (struct pubkey_hdr *)ukp->data;

		if (pkh->version != 1)
		goto err1;

		if (pkh->algo != PUBKEY_ALGO_RSA)
		goto err1;

		if (pkh->nmpi != 2)
		goto err1;

		datap = pkh->mpi;
		endp = datap + ukp->datalen;

		for (i = 0; i < pkh->nmpi; i++) {
		unsigned int remaining = endp - datap;
		pkey[i] = mpi_read_from_buffer(datap, &remaining);
		datap += remaining;
		}

		mblen = mpi_get_nbits(pkey[0]);
		mlen = (mblen + 7)/8;

		err = -ENOMEM;

		out1 = kzalloc(mlen, GFP_KERNEL);
		if (!out1)
		goto err;

		out2 = kzalloc(mlen, GFP_KERNEL);
		if (!out2)
		goto err;

		nret = siglen;
		in = mpi_read_from_buffer(sig, &nret);
		if (!in)
		goto err;

		res = mpi_alloc(mpi_get_nlimbs(in) * 2);
		if (!res)
		goto err;

		err = mpi_powm(res, in, pkey[1], pkey[0]);
		if (err)
		goto err;

		if (mpi_get_nlimbs(res) * BYTES_PER_MPI_LIMB > mlen) {
		err = -EINVAL;
		goto err;
		}

		p = mpi_get_buffer(res, &l, NULL);
		if (!p) {
		err = -EINVAL;
		goto err;
		}

		len = mlen;
		head = len - l;
		memset(out1, 0, head);
		memcpy(out1 + head, p, l);

		err = -EINVAL;
		pkcs_1_v1_5_decode_emsa(out1, len, mblen, out2, &len, &valid);

		if (valid && len == hlen)
		err = memcmp(out2, h, hlen);

		err:
		mpi_free(in);
		mpi_free(res);
		kfree(out1);
		kfree(out2);
		mpi_free(pkey[0]);
		mpi_free(pkey[1]);
		err1:
		up_read(&key->sem);

		return err;
		}

		/**
		* digsig_verify() - digital signature verification with public key
		* @keyring: keyring to search key in
		* @sig: digital signature
		* @sigen: length of the signature
		* @data: data
		* @datalen: length of the data
		* @return: 0 on success, -EINVAL otherwise
		*
		* Verifies data integrity against digital signature.
		* Currently only RSA is supported.
		* Normally hash of the content is used as a data for this function.
		*
		*/
		int digsig_verify(struct key keyring, const char sig, int siglen,
		const char *data, int datalen)
		{
		int err = -ENOMEM;
		struct signature_hdr sh = (struct signature_hdr )sig;
		struct shash_desc *desc = NULL;
		unsigned char hash[SHA1_DIGEST_SIZE];
		struct key *key;
		char name[20];

		if (siglen < sizeof(*sh) + 2)
		return -EINVAL;

		if (sh->algo != PUBKEY_ALGO_RSA)
		return -ENOTSUPP;

		sprintf(name, "%llX", __be64_to_cpup((uint64_t *)sh->keyid));

		if (keyring) {
		/* search in specific keyring */
		key_ref_t kref;
		kref = keyring_search(make_key_ref(keyring, 1UL),
		&key_type_user, name);
		if (IS_ERR(kref))
		key = ERR_PTR(PTR_ERR(kref));
		else
		key = key_ref_to_ptr(kref);
		} else {
		key = request_key(&key_type_user, name, NULL);
		}
		if (IS_ERR(key)) {
		pr_err("key not found, id: %s\n", name);
		return PTR_ERR(key);
		}

		desc = kzalloc(sizeof(*desc) + crypto_shash_descsize(shash),
		GFP_KERNEL);
		if (!desc)
		goto err;

		desc->tfm = shash;
		desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;

		crypto_shash_init(desc);
		crypto_shash_update(desc, data, datalen);
		crypto_shash_update(desc, sig, sizeof(*sh));
		crypto_shash_final(desc, hash);

		kfree(desc);

		/* pass signature mpis address */
		err = digsig_verify_rsa(key, sig + sizeof(sh), siglen - sizeof(sh),
		hash, sizeof(hash));

		err:
		key_put(key);

		return err ? -EINVAL : 0;
		}
		EXPORT_SYMBOL_GPL(digsig_verify);

		static int __init digsig_init(void)
		{
		shash = crypto_alloc_shash("sha1", 0, 0);
		if (IS_ERR(shash)) {
		pr_err("shash allocation failed\n");
		return PTR_ERR(shash);
		}

		return 0;

		}

		static void __exit digsig_cleanup(void)
		{
		crypto_free_shash(shash);
		}

		module_init(digsig_init);
		module_exit(digsig_cleanup);

		MODULE_LICENSE("GPL");