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any valid self-sig should mark a user ID or subkey as valid - otherwise,

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an attacker could DoS the user by inventing a bogus invalid
self-signature.
This commit is contained in:
David Shaw 2002-03-13 13:28:18 +00:00
parent bcf95b1d25
commit 22bc1b3a5e
2 changed files with 22 additions and 13 deletions
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6
g10/ChangeLog
View File

@ -1,3 +1,9 @@
2002-03-13 David Shaw <dshaw@jabberwocky.com>
* import.c (chk_self_sigs): any valid self-sig should mark a user
ID or subkey as valid - otherwise, an attacker could DoS the user
by inventing a bogus invalid self-signature.
2002-03-07 David Shaw <dshaw@jabberwocky.com> 2002-03-07 David Shaw <dshaw@jabberwocky.com>
* g10.c (main): make a few more strings translatable. * g10.c (main): make a few more strings translatable.

29
g10/import.c
View File

@ -815,16 +815,18 @@ chk_self_sigs( const char *fname, KBNODE keyblock,
(ulong)keyid[1]); (ulong)keyid[1]);
return -1; /* the complete keyblock is invalid */ return -1; /* the complete keyblock is invalid */
} }
rc = check_key_signature( keyblock, n, NULL);
if( rc ) {
log_info( rc == G10ERR_PUBKEY_ALGO ?
_("key %08lX: unsupported public key algorithm\n"):
_("key %08lX: invalid self-signature\n"),
(ulong)keyid[1]);
unode->flag |= 2; /* mark as invalid */ /* If it hasn't been marked valid yet, keep trying */
if(!(unode->flag&1)) {
rc = check_key_signature( keyblock, n, NULL);
if( rc )
log_info( rc == G10ERR_PUBKEY_ALGO ?
_("key %08lX: unsupported public key algorithm\n"):
_("key %08lX: invalid self-signature\n"),
(ulong)keyid[1]);
else
unode->flag |= 1; /* mark that signature checked */
} }
unode->flag |= 1; /* mark that signature checked */
} }
else if( sig->sig_class == 0x18 ) { else if( sig->sig_class == 0x18 ) {
KBNODE knode = find_prev_kbnode( keyblock, KBNODE knode = find_prev_kbnode( keyblock,
@ -839,16 +841,17 @@ chk_self_sigs( const char *fname, KBNODE keyblock,
n->flag |= 4; /* delete this */ n->flag |= 4; /* delete this */
} }
else { else {
/* If it hasn't been marked valid yet, keep trying */
if(!(knode->flag&1)) {
rc = check_key_signature( keyblock, n, NULL); rc = check_key_signature( keyblock, n, NULL);
if( rc ) { if( rc )
log_info( rc == G10ERR_PUBKEY_ALGO ? log_info( rc == G10ERR_PUBKEY_ALGO ?
_("key %08lX: unsupported public key algorithm\n"): _("key %08lX: unsupported public key algorithm\n"):
_("key %08lX: invalid subkey binding\n"), _("key %08lX: invalid subkey binding\n"),
(ulong)keyid[1]); (ulong)keyid[1]);
else
knode->flag |= 2; /* mark as invalid */ knode->flag |= 1; /* mark that signature checked */
} }
knode->flag |= 1; /* mark that signature checked */
} }
} }
} }