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New gpgsm server option no-encrypt-to.

Browse source 
Add caching for symkey encryption.
Minor cleanups.
This commit is contained in:
Werner Koch 2009-05-18 17:38:34 +00:00
parent f61e15670a
commit 387a51f951
12 changed files with 70 additions and 30 deletions
Download patch file Download diff file Expand all files Collapse all files

12
g10/ChangeLog
View file

@ -1,3 +1,15 @@
2009-05-18 Daiki Ueno <ueno@unixuser.org> (wk)
* encode.c (encode_simple): Tell passphrase_to_dek to cache
the passphrase.
(setup_symkey): Ditto.
* mainproc.c (proc_symkey_enc): Tell passphrase_to_dek to cache
the passphrase.
(proc_encrypted): Ditto.
* passphrase.c (hash_passphrase): Remove arg CREATE.
(passphrase_to_dek): New mode 3 and 4 for caching passphrase for
symmetric encryption.
2009-05-17 Werner Koch <wk@g10code.com>
* keygen.c (ask_algo): Add arg R_SUBKEY_ALGO. Change return value

4
g10/encode.c
View file

@ -216,7 +216,7 @@ encode_simple( const char *filename, int mode, int use_seskey )
s2k->mode = RFC1991? 0:opt.s2k_mode;
s2k->hash_algo=S2K_DIGEST_ALGO;
cfx.dek = passphrase_to_dek( NULL, 0,
default_cipher_algo(), s2k, 2,
default_cipher_algo(), s2k, 4,
NULL, &canceled);
if( !cfx.dek || !cfx.dek->keylen ) {
rc = gpg_error (canceled? GPG_ERR_CANCELED:GPG_ERR_INV_PASSPHRASE);
@ -397,7 +397,7 @@ setup_symkey(STRING2KEY **symkey_s2k,DEK **symkey_dek)
(*symkey_s2k)->hash_algo = S2K_DIGEST_ALGO;
*symkey_dek=passphrase_to_dek(NULL,0,opt.s2k_cipher_algo,
*symkey_s2k,2,NULL, &canceled);
*symkey_s2k, 4, NULL, &canceled);
if(!*symkey_dek || !(*symkey_dek)->keylen)
{
xfree(*symkey_dek);

4
g10/mainproc.c
View file

@ -311,7 +311,7 @@ proc_symkey_enc( CTX c, PACKET *pkt )
}
else
{
c->dek = passphrase_to_dek (NULL, 0, algo, &enc->s2k, 0,
c->dek = passphrase_to_dek (NULL, 0, algo, &enc->s2k, 3,
NULL, NULL);
if(c->dek)
{
@ -548,7 +548,7 @@ proc_encrypted( CTX c, PACKET *pkt )
log_info (_("assuming %s encrypted data\n"), "IDEA");
}
c->dek = passphrase_to_dek ( NULL, 0, algo, s2k, 0, NULL, NULL );
c->dek = passphrase_to_dek ( NULL, 0, algo, s2k, 3, NULL, NULL );
if (c->dek)
c->dek->algo_info_printed = 1;
}

49
g10/passphrase.c
View file

@ -50,11 +50,10 @@ static char *next_pw = NULL;
static char *last_pw = NULL;
/* Hash a passphrase using the supplied s2k. If create is true, create
a new salt or what else must be filled into the s2k for a new key.
always needs: dek->algo, s2k->mode, s2k->hash_algo. */
/* Hash a passphrase using the supplied s2k.
Always needs: dek->algo, s2k->mode, s2k->hash_algo. */
static void
hash_passphrase ( DEK *dek, char *pw, STRING2KEY *s2k, int create )
hash_passphrase ( DEK *dek, char *pw, STRING2KEY *s2k)
{
gcry_md_hd_t md;
int pass, i;
@ -82,13 +81,6 @@ hash_passphrase ( DEK *dek, char *pw, STRING2KEY *s2k, int create )
int len2 = pwlen + 8;
ulong count = len2;
if ( create && !pass )
{
gcry_randomize (s2k->salt, 8, GCRY_STRONG_RANDOM);
if ( s2k->mode == 3 )
s2k->count = opt.s2k_count;
}
if ( s2k->mode == 3 )
{
count = S2K_DECODE_COUNT(s2k->count);
@ -441,7 +433,9 @@ passphrase_clear_cache ( u32 *keyid, const char *cacheid, int algo )
MODE 0: Allow cached passphrase
1: Ignore cached passphrase
2: Ditto, but change the text to "repeat entry"
2: Ditto, but create a new key
3: Allow cached passphrase; use the S2K salt as the cache ID
4: Ditto, but create a new key
*/
DEK *
passphrase_to_dek_ext (u32 *keyid, int pubkey_algo,
@ -461,6 +455,7 @@ passphrase_to_dek_ext (u32 *keyid, int pubkey_algo,
if ( !s2k )
{
assert (mode != 3 && mode != 4);
/* This is used for the old rfc1991 mode
* Note: This must match the code in encode.c with opt.rfc1991 set */
s2k = &help_s2k;
@ -468,6 +463,15 @@ passphrase_to_dek_ext (u32 *keyid, int pubkey_algo,
s2k->hash_algo = S2K_DIGEST_ALGO;
}
/* Create a new salt or what else to be filled into the s2k for a
new key. */
if ((mode == 2 || mode == 4) && (s2k->mode == 1 || s2k->mode == 3))
{
gcry_randomize (s2k->salt, 8, GCRY_STRONG_RANDOM);
if ( s2k->mode == 3 )
s2k->count = opt.s2k_count;
}
/* If we do not have a passphrase available in NEXT_PW and status
information are request, we print them now. */
if ( !next_pw && is_status_enabled() )
@ -565,10 +569,21 @@ passphrase_to_dek_ext (u32 *keyid, int pubkey_algo,
}
else
{
char *cacheid = NULL;
char buf[1+16+1];
if ((mode == 3 || mode == 4) && (s2k->mode == 1 || s2k->mode == 3))
{
memset (buf, 0, sizeof buf);
*buf = 'S';
bin2hex (s2k->salt, 8, buf + 1);
cacheid = buf;
}
/* Divert to the gpg-agent. */
pw = passphrase_get ( keyid, mode == 2, NULL,
mode == 2? opt.passwd_repeat: 0,
tryagain_text, custdesc, custprompt, canceled);
pw = passphrase_get (keyid, mode == 2, cacheid,
(mode == 2 || mode == 4)? opt.passwd_repeat : 0,
tryagain_text, custdesc, custprompt, canceled);
if (*canceled)
{
xfree (pw);
@ -585,10 +600,10 @@ passphrase_to_dek_ext (u32 *keyid, int pubkey_algo,
get_last_passphrase(). */
dek = xmalloc_secure_clear ( sizeof *dek );
dek->algo = cipher_algo;
if ( !*pw && mode == 2 )
if ( !*pw && (mode == 2 || mode == 4))
dek->keylen = 0;
else
hash_passphrase( dek, pw, s2k, mode==2 );
hash_passphrase (dek, pw, s2k);
xfree(last_pw);
last_pw = pw;
return dek;