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gpg: Systematically detect and fix signatures that are out of order.
* g10/keyedit.c (sig_comparison): New function. (fix_key_signature_order): Merge functionality into... (check_all_keysigs): ... this function. Rewrite to eliminate duplicates and use a systematic approach to detecting and moving signatures that are out of order instead of a heuristic. (fix_keyblock): Don't call fix_key_signature_order. Call check_all_keysigs instead after collapsing the uids. -- Signed-off-by: Neal H. Walfield <neal@g10code.com> GnuPG-bug-id: 2236
This commit is contained in:
Neal H. Walfield
parent
44cdb9d73f
commit
2d1d795481
701
g10/keyedit.c
701
g10/keyedit.c
@ -322,97 +322,584 @@ print_and_check_one_sig (KBNODE keyblock, KBNODE node,
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/*
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* Check the keysigs and set the flags to indicate errors.
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* Returns true if error found.
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*/
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/* Order two signatures. The actual ordering isn't important. Our
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goal is to ensure that identical signatures occur together. */
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static int
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check_all_keysigs (KBNODE keyblock, int only_selected, int only_selfsigs)
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sig_comparison (const void *av, const void *bv)
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{
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KBNODE kbctx;
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KBNODE node;
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int inv_sigs = 0;
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int no_key = 0;
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int oth_err = 0;
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int has_selfsig = 0;
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int mis_selfsig = 0;
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int selected = !only_selected;
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int anyuid = 0;
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u32 keyid[2];
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const KBNODE an = *(const KBNODE *) av;
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const KBNODE bn = *(const KBNODE *) bv;
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const PKT_signature *a;
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const PKT_signature *b;
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int ndataa;
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int ndatab;
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int i;
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for (kbctx = NULL; (node = walk_kbnode (keyblock, &kbctx, 0));)
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assert (an->pkt->pkttype == PKT_SIGNATURE);
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assert (bn->pkt->pkttype == PKT_SIGNATURE);
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a = an->pkt->pkt.signature;
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b = bn->pkt->pkt.signature;
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if (a->digest_algo < b->digest_algo)
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return -1;
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if (a->digest_algo > b->digest_algo)
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return 1;
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ndataa = pubkey_get_nsig (a->pubkey_algo);
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ndatab = pubkey_get_nsig (a->pubkey_algo);
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assert (ndataa == ndatab);
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for (i = 0; i < ndataa; i ++)
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{
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if (node->pkt->pkttype == PKT_PUBLIC_KEY)
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{
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if (only_selfsigs)
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keyid_from_pk (node->pkt->pkt.public_key, keyid);
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}
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else if (node->pkt->pkttype == PKT_USER_ID)
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{
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PKT_user_id *uid = node->pkt->pkt.user_id;
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if (only_selected)
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selected = (node->flag & NODFLG_SELUID);
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if (selected)
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{
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tty_printf ("uid ");
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tty_print_utf8_string (uid->name, uid->len);
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tty_printf ("\n");
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if (anyuid && !has_selfsig)
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mis_selfsig++;
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has_selfsig = 0;
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anyuid = 1;
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}
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}
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else if (selected && node->pkt->pkttype == PKT_SIGNATURE
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&& ((node->pkt->pkt.signature->sig_class & ~3) == 0x10
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|| node->pkt->pkt.signature->sig_class == 0x30))
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{
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int selfsig;
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PKT_signature *sig = node->pkt->pkt.signature;
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if (only_selfsigs
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&& !(keyid[0] == sig->keyid[0] && keyid[1] == sig->keyid[1]))
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{
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/* Not a selfsig but we want only selfsigs - skip. */
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/* Static analyzer note: A claim that KEYID above has
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garbage is not correct because KEYID is set from the
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public key packet which is always the first packet in
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a keyblock and thus parsed before this signature. */
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}
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else if (print_and_check_one_sig (keyblock, node, &inv_sigs,
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&no_key, &oth_err, &selfsig,
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0, only_selfsigs))
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{
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if (selfsig)
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has_selfsig = 1;
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}
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/* Hmmm: should we update the trustdb here? */
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}
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int c = gcry_mpi_cmp (a->data[i], b->data[i]);
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if (c != 0)
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return c;
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}
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if (!has_selfsig)
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mis_selfsig++;
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if (inv_sigs)
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tty_printf (ngettext("%d bad signature\n",
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"%d bad signatures\n", inv_sigs), inv_sigs);
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/* Okay, they are equal. */
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return 0;
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}
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if (no_key)
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tty_printf (ngettext("%d signature not checked due to a missing key\n",
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"%d signatures not checked due to missing keys\n",
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no_key), no_key);
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/* Perform a few sanity checks on a keyblock is okay and possibly
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repair some damage. Concretely:
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if (oth_err)
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tty_printf (ngettext("%d signature not checked due to an error\n",
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"%d signatures not checked due to errors\n",
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oth_err), oth_err);
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- Detect duplicate signatures and remove them.
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if (mis_selfsig)
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tty_printf (ngettext("%d user ID without valid self-signature detected\n",
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"%d user IDs without valid self-signatures detected\n",
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mis_selfsig), mis_selfsig);
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- Detect out of order signatures and relocate them (e.g., a sig
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over user id X located under subkey Y).
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return inv_sigs || no_key || oth_err || mis_selfsig;
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Note: this function does not remove signatures that don't belong or
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components that are not signed! (Although it would be trivial to
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do so.)
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If ONLY_SELFSIGS is true, then this function only reorders self
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signatures (it still checks all signatures for duplicates,
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however).
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Returns 1 if the keyblock was modified, 0 otherwise. */
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static int
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check_all_keysigs (KBNODE kb, int only_selected, int only_selfsigs)
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{
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gpg_error_t err;
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PKT_public_key *pk;
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KBNODE n, n_next, *n_prevp, n2;
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char *pending_desc = NULL;
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PKT_public_key *issuer;
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KBNODE last_printed_component;
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KBNODE current_component = NULL;
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int dups = 0;
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int missing_issuer = 0;
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int reordered = 0;
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int bad_signature = 0;
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int missing_selfsig = 0;
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int modified = 0;
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assert (kb->pkt->pkttype == PKT_PUBLIC_KEY);
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pk = kb->pkt->pkt.public_key;
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/* First we look for duplicates. */
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{
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int nsigs = 0;
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KBNODE *sigs;
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int i;
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int last_i;
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/* Count the sigs. */
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for (n = kb; n; n = n->next)
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if (is_deleted_kbnode (n))
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continue;
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else if (n->pkt->pkttype == PKT_SIGNATURE)
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nsigs ++;
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/* Add them all to the SIGS array. */
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sigs = xmalloc_clear (sizeof (*sigs) * nsigs);
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i = 0;
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for (n = kb; n; n = n->next)
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{
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if (is_deleted_kbnode (n))
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continue;
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if (n->pkt->pkttype != PKT_SIGNATURE)
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continue;
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sigs[i] = n;
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i ++;
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}
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assert (i == nsigs);
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qsort (sigs, nsigs, sizeof (sigs[0]), sig_comparison);
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last_i = 0;
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for (i = 1; i < nsigs; i ++)
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{
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assert (sigs[last_i]);
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assert (sigs[last_i]->pkt->pkttype == PKT_SIGNATURE);
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assert (sigs[i]);
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assert (sigs[i]->pkt->pkttype == PKT_SIGNATURE);
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if (sig_comparison (&sigs[last_i], &sigs[i]) == 0)
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/* They are the same. Kill the latter. */
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{
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if (DBG_PACKET)
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{
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PKT_signature *sig = sigs[i]->pkt->pkt.signature;
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log_debug ("Signature appears multiple times, deleting duplicate:\n");
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log_debug (" sig: class 0x%x, issuer: %s, timestamp: %s (%lld), digest: %02x %02x\n",
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sig->sig_class, keystr (sig->keyid),
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isotimestamp (sig->timestamp),
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(long long) sig->timestamp,
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sig->digest_start[0], sig->digest_start[1]);
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}
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/* Remove sigs[i] from the keyblock. */
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{
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KBNODE z, *prevp;
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int to_kill = last_i;
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last_i = i;
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for (prevp = &kb, z = kb; z; prevp = &z->next, z = z->next)
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if (z == sigs[to_kill])
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break;
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*prevp = sigs[to_kill]->next;
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sigs[to_kill]->next = NULL;
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release_kbnode (sigs[to_kill]);
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sigs[to_kill] = NULL;
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dups ++;
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modified = 1;
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}
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}
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else
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last_i = i;
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}
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xfree (sigs);
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}
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/* Make sure the sigs occur after the component (public key, subkey,
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user id) that they sign. */
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issuer = NULL;
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last_printed_component = NULL;
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for (n_prevp = &kb, n = kb;
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n;
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/* If we moved n, then n_prevp is need valid. */
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n_prevp = (n->next == n_next ? &n->next : n_prevp), n = n_next)
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{
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PACKET *p;
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int processed_current_component;
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PKT_signature *sig;
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int rc;
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int dump_sig_params = 0;
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n_next = n->next;
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if (is_deleted_kbnode (n))
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continue;
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p = n->pkt;
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if (issuer && issuer != pk)
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{
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free_public_key (issuer);
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issuer = NULL;
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}
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xfree (pending_desc);
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pending_desc = NULL;
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switch (p->pkttype)
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{
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case PKT_PUBLIC_KEY:
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assert (p->pkt.public_key == pk);
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if (only_selected && ! (n->flag & NODFLG_SELKEY))
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{
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current_component = NULL;
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break;
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}
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if (DBG_PACKET)
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log_debug ("public key %s: timestamp: %s (%lld)\n",
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pk_keyid_str (pk),
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isotimestamp (pk->timestamp),
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(long long) pk->timestamp);
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current_component = n;
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break;
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case PKT_PUBLIC_SUBKEY:
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if (only_selected && ! (n->flag & NODFLG_SELKEY))
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{
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current_component = NULL;
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break;
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}
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if (DBG_PACKET)
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log_debug ("subkey %s: timestamp: %s (%lld)\n",
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pk_keyid_str (p->pkt.public_key),
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isotimestamp (p->pkt.public_key->timestamp),
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(long long) p->pkt.public_key->timestamp);
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current_component = n;
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break;
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case PKT_USER_ID:
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if (only_selected && ! (n->flag & NODFLG_SELUID))
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{
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current_component = NULL;
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break;
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}
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if (DBG_PACKET)
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log_debug ("user id: %s\n",
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p->pkt.user_id->attrib_data
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? "[ photo id ]"
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: p->pkt.user_id->name);
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current_component = n;
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break;
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case PKT_SIGNATURE:
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if (! current_component)
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/* The current component is not selected, don't check the
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sigs under it. */
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break;
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sig = n->pkt->pkt.signature;
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pending_desc = xasprintf (" sig: class: 0x%x, issuer: %s, timestamp: %s (%lld), digest: %02x %02x",
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sig->sig_class,
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keystr (sig->keyid),
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isotimestamp (sig->timestamp),
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(long long) sig->timestamp,
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sig->digest_start[0], sig->digest_start[1]);
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if (keyid_cmp (pk_keyid (pk), sig->keyid) == 0)
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issuer = pk;
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else
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/* Issuer is a different key. */
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{
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if (only_selfsigs)
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continue;
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issuer = xmalloc (sizeof (*issuer));
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err = get_pubkey (issuer, sig->keyid);
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if (err)
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{
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xfree (issuer);
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issuer = NULL;
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if (DBG_PACKET)
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{
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if (pending_desc)
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log_debug ("%s", pending_desc);
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log_debug (" Can't check signature allegedly issued by %s: %s\n",
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keystr (sig->keyid), gpg_strerror (err));
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}
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missing_issuer ++;
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break;
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}
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}
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if ((err = openpgp_pk_test_algo (sig->pubkey_algo)))
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{
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if (DBG_PACKET && pending_desc)
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log_debug ("%s", pending_desc);
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tty_printf (_("can't check signature with unsupported public-key algorithm (%d): %s.\n"),
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sig->pubkey_algo, gpg_strerror (err));
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break;
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}
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if ((err = openpgp_md_test_algo (sig->digest_algo)))
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{
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if (DBG_PACKET && pending_desc)
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log_debug ("%s", pending_desc);
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tty_printf (_("can't check signature with unsupported message-digest algorithm %d: %s.\n"),
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sig->digest_algo, gpg_strerror (err));
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break;
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}
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/* We iterate over the keyblock. Most likely, the matching
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component is the current component so always try that
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first. */
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processed_current_component = 0;
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for (n2 = current_component;
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n2;
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n2 = (processed_current_component ? n2->next : kb),
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processed_current_component = 1)
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if (is_deleted_kbnode (n2))
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continue;
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else if (processed_current_component && n2 == current_component)
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/* Don't process it twice. */
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continue;
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else
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{
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err = check_signature_over_key_or_uid (issuer, sig, kb, n2->pkt,
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NULL, NULL);
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if (! err)
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break;
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}
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/* n/sig is a signature and n2 is the component (public key,
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subkey or user id) that it signs, if any.
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current_component is that component that it appears to
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apply to (according to the ordering). */
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if (current_component == n2)
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{
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if (DBG_PACKET)
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{
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log_debug ("%s", pending_desc);
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log_debug (" Good signature over last key or uid!\n");
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}
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rc = 0;
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}
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else if (n2)
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{
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assert (n2->pkt->pkttype == PKT_USER_ID
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|| n2->pkt->pkttype == PKT_PUBLIC_KEY
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|| n2->pkt->pkttype == PKT_PUBLIC_SUBKEY);
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if (DBG_PACKET)
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{
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log_debug ("%s", pending_desc);
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log_debug (" Good signature out of order! (Over %s (%d) '%s')\n",
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n2->pkt->pkttype == PKT_USER_ID
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? "user id"
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: n2->pkt->pkttype == PKT_PUBLIC_SUBKEY
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? "subkey"
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: "primary key",
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n2->pkt->pkttype,
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n2->pkt->pkttype == PKT_USER_ID
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? n2->pkt->pkt.user_id->name
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: pk_keyid_str (n2->pkt->pkt.public_key));
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}
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/* Reorder the packets: move the signature n to be just
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after n2. */
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/* Unlink the signature. */
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assert (n_prevp);
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*n_prevp = n->next;
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/* Insert the sig immediately after the component. */
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n->next = n2->next;
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n2->next = n;
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reordered ++;
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modified = 1;
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rc = 0;
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}
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else
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{
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if (DBG_PACKET)
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{
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log_debug ("%s", pending_desc);
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log_debug (" Bad signature.\n");
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}
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if (DBG_PACKET)
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dump_sig_params = 1;
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bad_signature ++;
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rc = GPG_ERR_BAD_SIGNATURE;
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}
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/* We don't cache the result here, because we haven't
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completely checked that the signature is legitimate. For
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instance, if we have a revocation certificate on Alice's
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key signed by Bob, the signature may be good, but we
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haven't checked that Bob is a designated revoker. */
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/* cache_sig_result (sig, rc); */
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{
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int has_selfsig = 0;
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if (! rc && issuer == pk)
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{
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if (n2->pkt->pkttype == PKT_PUBLIC_KEY
|
||||
&& (/* Direct key signature. */
|
||||
sig->sig_class == 0x1f
|
||||
/* Key revocation signature. */
|
||||
|| sig->sig_class == 0x20))
|
||||
has_selfsig = 1;
|
||||
if (n2->pkt->pkttype == PKT_PUBLIC_SUBKEY
|
||||
&& (/* Subkey binding sig. */
|
||||
sig->sig_class == 0x18
|
||||
/* Subkey revocation sig. */
|
||||
|| sig->sig_class == 0x28))
|
||||
has_selfsig = 1;
|
||||
if (n2->pkt->pkttype == PKT_USER_ID
|
||||
&& (/* Certification sigs. */
|
||||
sig->sig_class == 0x10
|
||||
|| sig->sig_class == 0x11
|
||||
|| sig->sig_class == 0x12
|
||||
|| sig->sig_class == 0x13
|
||||
/* Certification revocation sig. */
|
||||
|| sig->sig_class == 0x30))
|
||||
has_selfsig = 1;
|
||||
}
|
||||
|
||||
if ((n2 && n2 != last_printed_component)
|
||||
|| (! n2 && last_printed_component != current_component))
|
||||
{
|
||||
int is_reordered = n2 && n2 != current_component;
|
||||
if (n2)
|
||||
last_printed_component = n2;
|
||||
else
|
||||
last_printed_component = current_component;
|
||||
|
||||
if (last_printed_component->pkt->pkttype == PKT_USER_ID)
|
||||
{
|
||||
tty_printf ("uid ");
|
||||
tty_print_utf8_string (last_printed_component
|
||||
->pkt->pkt.user_id->name,
|
||||
last_printed_component
|
||||
->pkt->pkt.user_id->len);
|
||||
}
|
||||
else if (last_printed_component->pkt->pkttype
|
||||
== PKT_PUBLIC_KEY)
|
||||
tty_printf ("pub %s",
|
||||
pk_keyid_str (last_printed_component
|
||||
->pkt->pkt.public_key));
|
||||
else
|
||||
tty_printf ("sub %s",
|
||||
pk_keyid_str (last_printed_component
|
||||
->pkt->pkt.public_key));
|
||||
|
||||
if (is_reordered)
|
||||
tty_printf (_(" (reordered signatures follow)"));
|
||||
tty_printf ("\n");
|
||||
}
|
||||
|
||||
print_one_sig (rc, kb, n, NULL, NULL, NULL, has_selfsig,
|
||||
0, only_selfsigs);
|
||||
}
|
||||
|
||||
if (dump_sig_params)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < pubkey_get_nsig (sig->pubkey_algo); i ++)
|
||||
{
|
||||
char buffer[1024];
|
||||
size_t len;
|
||||
char *printable;
|
||||
gcry_mpi_print (GCRYMPI_FMT_USG,
|
||||
buffer, sizeof (buffer), &len,
|
||||
sig->data[i]);
|
||||
printable = bin2hex (buffer, len, NULL);
|
||||
log_info (" %d: %s\n", i, printable);
|
||||
xfree (printable);
|
||||
}
|
||||
}
|
||||
break;
|
||||
default:
|
||||
if (DBG_PACKET)
|
||||
log_debug ("unhandled packet: %d\n", p->pkttype);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
xfree (pending_desc);
|
||||
pending_desc = NULL;
|
||||
|
||||
if (issuer != pk)
|
||||
free_public_key (issuer);
|
||||
issuer = NULL;
|
||||
|
||||
/* Identify keys / uids that don't have a self-sig. */
|
||||
{
|
||||
int has_selfsig = 0;
|
||||
PACKET *p;
|
||||
PKT_signature *sig;
|
||||
|
||||
current_component = NULL;
|
||||
for (n = kb; n; n = n->next)
|
||||
{
|
||||
if (is_deleted_kbnode (n))
|
||||
continue;
|
||||
|
||||
p = n->pkt;
|
||||
|
||||
switch (p->pkttype)
|
||||
{
|
||||
case PKT_PUBLIC_KEY:
|
||||
case PKT_PUBLIC_SUBKEY:
|
||||
case PKT_USER_ID:
|
||||
if (current_component && ! has_selfsig)
|
||||
missing_selfsig ++;
|
||||
current_component = n;
|
||||
has_selfsig = 0;
|
||||
break;
|
||||
|
||||
case PKT_SIGNATURE:
|
||||
if (! current_component || has_selfsig)
|
||||
break;
|
||||
|
||||
sig = n->pkt->pkt.signature;
|
||||
|
||||
if (! (sig->flags.checked && sig->flags.valid))
|
||||
break;
|
||||
|
||||
if (keyid_cmp (pk_keyid (pk), sig->keyid) != 0)
|
||||
/* Different issuer, couldn't be a self-sig. */
|
||||
break;
|
||||
|
||||
if (current_component->pkt->pkttype == PKT_PUBLIC_KEY
|
||||
&& (/* Direct key signature. */
|
||||
sig->sig_class == 0x1f
|
||||
/* Key revocation signature. */
|
||||
|| sig->sig_class == 0x20))
|
||||
has_selfsig = 1;
|
||||
if (current_component->pkt->pkttype == PKT_PUBLIC_SUBKEY
|
||||
&& (/* Subkey binding sig. */
|
||||
sig->sig_class == 0x18
|
||||
/* Subkey revocation sig. */
|
||||
|| sig->sig_class == 0x28))
|
||||
has_selfsig = 1;
|
||||
if (current_component->pkt->pkttype == PKT_USER_ID
|
||||
&& (/* Certification sigs. */
|
||||
sig->sig_class == 0x10
|
||||
|| sig->sig_class == 0x11
|
||||
|| sig->sig_class == 0x12
|
||||
|| sig->sig_class == 0x13
|
||||
/* Certification revocation sig. */
|
||||
|| sig->sig_class == 0x30))
|
||||
has_selfsig = 1;
|
||||
|
||||
break;
|
||||
|
||||
default:
|
||||
if (current_component && ! has_selfsig)
|
||||
missing_selfsig ++;
|
||||
current_component = NULL;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (dups || missing_issuer || bad_signature || reordered)
|
||||
tty_printf (_("key %s:\n"), pk_keyid_str (pk));
|
||||
|
||||
if (dups)
|
||||
tty_printf (ngettext ("%d duplicate signature removed\n",
|
||||
"%d duplicate signatures removed\n", dups), dups);
|
||||
if (missing_issuer)
|
||||
tty_printf (ngettext ("%d signature not checked due to a missing key\n",
|
||||
"%d signatures not checked due to missing keys\n",
|
||||
missing_issuer), missing_issuer);
|
||||
if (bad_signature)
|
||||
tty_printf (ngettext ("%d bad signature\n",
|
||||
"%d bad signatures\n",
|
||||
bad_signature), bad_signature);
|
||||
if (reordered)
|
||||
tty_printf (ngettext ("%d signature reordered\n",
|
||||
"%d signatures reordered\n",
|
||||
reordered), reordered);
|
||||
|
||||
if (only_selfsigs && (bad_signature || reordered))
|
||||
tty_printf (_("Warning: errors found and only checked self-signatures, run 'check' to check all signatures.\n"));
|
||||
|
||||
return modified;
|
||||
}
|
||||
|
||||
|
||||
@ -1247,54 +1734,6 @@ change_passphrase (ctrl_t ctrl, kbnode_t keyblock)
|
||||
|
||||
|
||||
|
||||
/*
|
||||
* There are some keys out (due to a bug in gnupg), where the sequence
|
||||
* of the packets is wrong. This function fixes that.
|
||||
* Returns: true if the keyblock has been fixed.
|
||||
*
|
||||
* Note: This function does not work if there is more than one user ID.
|
||||
*/
|
||||
static int
|
||||
fix_key_signature_order (KBNODE keyblock)
|
||||
{
|
||||
KBNODE node, last, subkey;
|
||||
int fixed = 0;
|
||||
|
||||
/* Locate key signatures of class 0x10..0x13 behind sub key packets. */
|
||||
for (subkey = last = NULL, node = keyblock; node;
|
||||
last = node, node = node->next)
|
||||
{
|
||||
switch (node->pkt->pkttype)
|
||||
{
|
||||
case PKT_PUBLIC_SUBKEY:
|
||||
case PKT_SECRET_SUBKEY:
|
||||
if (!subkey)
|
||||
subkey = last; /* Actually it is the one before the subkey. */
|
||||
break;
|
||||
case PKT_SIGNATURE:
|
||||
if (subkey)
|
||||
{
|
||||
PKT_signature *sig = node->pkt->pkt.signature;
|
||||
if (sig->sig_class >= 0x10 && sig->sig_class <= 0x13)
|
||||
{
|
||||
log_info (_("moving a key signature to the correct place\n"));
|
||||
last->next = node->next;
|
||||
node->next = subkey->next;
|
||||
subkey->next = node;
|
||||
node = last;
|
||||
fixed = 1;
|
||||
}
|
||||
}
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return fixed;
|
||||
}
|
||||
|
||||
|
||||
/* Fix various problems in the keyblock. Returns true if the keyblock
|
||||
was changed. Note that a pointer to the keyblock must be given and
|
||||
the function may change it (i.e. replacing the first node). */
|
||||
@ -1303,10 +1742,10 @@ fix_keyblock (kbnode_t *keyblockp)
|
||||
{
|
||||
int changed = 0;
|
||||
|
||||
if (fix_key_signature_order (*keyblockp))
|
||||
changed++;
|
||||
if (collapse_uids (keyblockp))
|
||||
changed++;
|
||||
if (check_all_keysigs (*keyblockp, 0, 1))
|
||||
changed++;
|
||||
reorder_keyblock (*keyblockp);
|
||||
/* If we modified the keyblock, make sure the flags are right. */
|
||||
if (changed)
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user