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common,gpg,sm: Restrict the use of algorithms according to CO_DE_VS.

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* common/compliance.c (gnupg_pk_is_allowed): New function.
(gnupg_cipher_is_allowed): Likewise.
(gnupg_digest_is_allowed): Likewise.
* common/compliance.h (enum pk_use_case): New definition.
(gnupg_pk_is_allowed): New prototype.
(gnupg_cipher_is_allowed): Likewise.
(gnupg_digest_is_allowed): Likewise.
* g10/decrypt-data.c (decrypt_data): Restrict use of algorithms using
the new predicates.
* g10/encrypt.c (encrypt_crypt): Likewise.
* g10/gpg.c (main): Likewise.
* g10/pubkey-enc.c (get_session_key): Likewise.
* g10/sig-check.c (check_signature2): Likewise.
* g10/sign.c (do_sign): Likewise.
* sm/decrypt.c (gpgsm_decrypt): Likewise.
* sm/encrypt.c (gpgsm_encrypt): Likewise.
* sm/gpgsm.c (main): Likewise.
* sm/sign.c (gpgsm_sign): Likewise.
* sm/verify.c (gpgsm_verify): Likewise.
--

With this change, policies can effectively restrict what algorithms
are used for different purposes.  The algorithm policy for CO_DE_VS is
implemented.

GnuPG-bug-id: 3191
Signed-off-by: Justus Winter <justus@g10code.com>
This commit is contained in:
Justus Winter 2017-06-06 16:01:40 +02:00
parent b03fab09e1
commit a64a55e104
No known key found for this signature in database
GPG key ID: DD1A52F9DA8C9020
13 changed files with 503 additions and 20 deletions
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39
sm/decrypt.c
View file

@ -358,6 +358,17 @@ gpgsm_decrypt (ctrl_t ctrl, int in_fd, estream_t out_fp)
goto leave;
}
/* Check compliance. */
if (! gnupg_cipher_is_allowed (opt.compliance, 0, algo, mode))
{
log_error (_ ("you may not use cipher algorithm '%s'"
" while in %s mode\n"),
gcry_cipher_algo_name (algo),
gnupg_compliance_option_string (opt.compliance));
rc = gpg_error (GPG_ERR_CIPHER_ALGO);
goto leave;
}
/* For CMS, CO_DE_VS demands CBC mode. */
is_de_vs = gnupg_cipher_is_compliant (CO_DE_VS, algo, mode);
@ -465,15 +476,27 @@ gpgsm_decrypt (ctrl_t ctrl, int in_fd, estream_t out_fp)
hexkeygrip = gpgsm_get_keygrip_hexstring (cert);
desc = gpgsm_format_keydesc (cert);
/* Check that all certs are compliant with CO_DE_VS. */
if (is_de_vs)
{
unsigned int nbits;
int pk_algo = gpgsm_get_key_algo_info (cert, &nbits);
{
unsigned int nbits;
int pk_algo = gpgsm_get_key_algo_info (cert, &nbits);
is_de_vs = gnupg_pk_is_compliant (CO_DE_VS, pk_algo, NULL,
nbits, NULL);
}
/* Check compliance. */
if (! gnupg_pk_is_allowed (opt.compliance, PK_USE_DECRYPTION,
pk_algo, NULL, nbits, NULL))
{
log_error ("certificate ID 0x%08lX not suitable for "
"decryption while in %s mode\n",
gpgsm_get_short_fingerprint (cert, NULL),
gnupg_compliance_option_string (opt.compliance));
rc = gpg_error (GPG_ERR_PUBKEY_ALGO);
goto oops;
}
/* Check that all certs are compliant with CO_DE_VS. */
is_de_vs = (is_de_vs
&& gnupg_pk_is_compliant (CO_DE_VS, pk_algo, NULL,
nbits, NULL));
}
oops:
if (rc)