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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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12
g10/decrypt-data.c
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@ -29,6 +29,7 @@
#include "options.h"
#include "../common/i18n.h"
#include "../common/status.h"
#include "../common/compliance.h"
static int mdc_decode_filter ( void *opaque, int control, IOBUF a,
@ -97,6 +98,17 @@ decrypt_data (ctrl_t ctrl, void *procctx, PKT_encrypted *ed, DEK *dek)
dek->algo_info_printed = 1;
}
/* Check compliance. */
if (! gnupg_cipher_is_allowed (opt.compliance, 0, dek->algo, GCRY_CIPHER_MODE_CFB))
{
log_error (_ ("you may not use cipher algorithm '%s'"
" while in %s mode\n"),
openpgp_cipher_algo_name (dek->algo),
gnupg_compliance_option_string (opt.compliance));
rc = gpg_error (GPG_ERR_CIPHER_ALGO);
goto leave;
}
{
char buf[20];