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Date: Sat, 30 Dec 2017 12:20:40 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Dan Aloni <dan@...nelim.com>, linux-kernel@...r.kernel.org,
kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH 4/5] tools: add dmesg decryption program
On 12/30/2017 09:58 AM, Dan Aloni wrote:
> From: Dan Aloni <dan@...nelim.com>
>
> Example execution:
>
> dmesg | dmesg-decipher <private-key.pem>
>
> Signed-off-by: Dan Aloni <dan@...nelim.com>
> ---
> diff --git a/tools/kmsg/dmesg-decipher.c b/tools/kmsg/dmesg-decipher.c
> new file mode 100644
> index 000000000000..c7149fe7dc17
> --- /dev/null
> +++ b/tools/kmsg/dmesg-decipher.c
> @@ -0,0 +1,316 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * dmesg-decipher.c
> + *
> + * A sample utility to decrypt an encrypted dmesg output, for
> + * developement with kernels having kmsg encryption enabled.
> + *
> + * Copyright (c) Dan Aloni, 2017
> + *
> + * Compile with
> + * gcc -I/usr/src/linux/include getdelays.c -o getdelays
copy-paste error ^^^
> + */
> +
> +#include <openssl/pem.h>
> +#include <openssl/pkcs7.h>
> +#include <openssl/err.h>
> +
> +#include <stdbool.h>
> +#include <stdint.h>
> +#include <string.h>
> +#include <regex.h>
[snip]
> +int main(int argc, char **argv)
> +{
> + BIO *tbio = NULL;
> + RSA *rsa;
> + int ret = 1;
> + char line[0x1000];
> + uint8_t enc_sess_key[0x200];
> + uint8_t sess_key[0x200] = {0, };
> + bool got_key = false;
> +
> + OpenSSL_add_all_algorithms();
> + ERR_load_crypto_strings();
> +
> + regex_t session_key_regex;
> + regex_t message_regex;
> +
> + ret = regcomp(&session_key_regex, session_key_pattern, REG_EXTENDED);
> + if (ret) {
> + goto err;
> + }
> +
> + ret = regcomp(&message_regex, message_pattern, REG_EXTENDED);
> + if (ret) {
> + goto err;
> + }
> +
> + if (argc < 2) {
> + fprintf(stderr, "not enough paramters\n");
parameters
> + return -1;
> + }
--
~Randy
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