linux-hardening - Re: [PATCH v2] sign-file: Convert API usage to support OpenSSL v3

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Date:   Thu, 19 May 2022 08:45:36 +0200
From:   Salvatore Bonaccorso <carnil@...ian.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     David Howells <dhowells@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Eric Biggers <ebiggers@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        keyrings@...r.kernel.org, Adam Langley <agl@...gle.com>,
        Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] sign-file: Convert API usage to support OpenSSL v3

Hi Kees,

On Wed, May 18, 2022 at 02:51:29PM -0700, Kees Cook wrote:
> OpenSSL's ENGINE API is deprecated in OpenSSL v3.0, along with some
> other functions. Remove the ENGINE use and a macro work-around for
> ERR_get_error_line().
> 
> Cc: David Howells <dhowells@...hat.com>
> Cc: David Woodhouse <dwmw2@...radead.org>
> Cc: Eric Biggers <ebiggers@...nel.org>
> Cc: Shuah Khan <skhan@...uxfoundation.org>
> Cc: Salvatore Bonaccorso <carnil@...ian.org>
> Cc: keyrings@...r.kernel.org
> Suggested-by: Adam Langley <agl@...gle.com>
> Co-developed-by: Lee Jones <lee.jones@...aro.org>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
> v1: https://lore.kernel.org/lkml/20211005161833.1522737-1-lee.jones@linaro.org/
> v2: https://lore.kernel.org/lkml/Yicwb+Ceiu8JjVIS@google.com/
> v3:
>  - Eliminate all the build warnings with OpenSSL 3
>  - Fully remove ENGINE usage, if it can be optional, just drop it.
> ---
>  scripts/sign-file.c | 49 ++++++++++-----------------------------------
>  1 file changed, 11 insertions(+), 38 deletions(-)
> 
> diff --git a/scripts/sign-file.c b/scripts/sign-file.c
> index fbd34b8e8f57..2d633c5f57c3 100644
> --- a/scripts/sign-file.c
> +++ b/scripts/sign-file.c
> @@ -52,6 +52,10 @@
>  #include <openssl/pkcs7.h>
>  #endif
>  
> +#if OPENSSL_VERSION_MAJOR >= 3
> +#define ERR_get_error_line(f, l)	ERR_get_error_all(f, l, NULL, NULL, NULL)
> +#endif
> +
>  struct module_signature {
>  	uint8_t		algo;		/* Public-key crypto algorithm [0] */
>  	uint8_t		hash;		/* Digest algorithm [0] */
> @@ -92,16 +96,6 @@ static void display_openssl_errors(int l)
>  	}
>  }
>  
> -static void drain_openssl_errors(void)
> -{
> -	const char *file;
> -	int line;
> -
> -	if (ERR_peek_error() == 0)
> -		return;
> -	while (ERR_get_error_line(&file, &line)) {}
> -}
> -
>  #define ERR(cond, fmt, ...)				\
>  	do {						\
>  		bool __cond = (cond);			\
> @@ -135,35 +129,14 @@ static int pem_pw_cb(char *buf, int len, int w, void *v)
>  static EVP_PKEY *read_private_key(const char *private_key_name)
>  {
>  	EVP_PKEY *private_key;
> +	BIO *b;
>  
> -	if (!strncmp(private_key_name, "pkcs11:", 7)) {
> -		ENGINE *e;
> -
> -		ENGINE_load_builtin_engines();
> -		drain_openssl_errors();
> -		e = ENGINE_by_id("pkcs11");
> -		ERR(!e, "Load PKCS#11 ENGINE");
> -		if (ENGINE_init(e))
> -			drain_openssl_errors();
> -		else
> -			ERR(1, "ENGINE_init");
> -		if (key_pass)
> -			ERR(!ENGINE_ctrl_cmd_string(e, "PIN", key_pass, 0),
> -			    "Set PKCS#11 PIN");
> -		private_key = ENGINE_load_private_key(e, private_key_name,
> -						      NULL, NULL);
> -		ERR(!private_key, "%s", private_key_name);
> -	} else {
> -		BIO *b;
> -
> -		b = BIO_new_file(private_key_name, "rb");
> -		ERR(!b, "%s", private_key_name);
> -		private_key = PEM_read_bio_PrivateKey(b, NULL, pem_pw_cb,
> -						      NULL);
> -		ERR(!private_key, "%s", private_key_name);
> -		BIO_free(b);
> -	}
> -
> +	b = BIO_new_file(private_key_name, "rb");
> +	ERR(!b, "%s", private_key_name);
> +	private_key = PEM_read_bio_PrivateKey(b, NULL, pem_pw_cb,
> +					      NULL);
> +	ERR(!private_key, "%s", private_key_name);
> +	BIO_free(b);
>  	return private_key;
>  }

Fixes for us as well the build warnings for sign-file.c (as you noted
the other part is still in extract-cert.c).

Tested-by: Salvatore Bonaccorso <carnil@...ian.org>

Regards,
Salvatore