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upstream: apply destination constraints to all p11 keys

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Previously applied only to the first key returned from each token.

ok markus@

OpenBSD-Commit-ID: 36df3afb8eb94eec6b2541f063d0d164ef8b488d
This commit is contained in:
djm@openbsd.org 2023-12-18 14:46:12 +00:00 committed by Damien Miller
parent a7ed931cae
commit 881d9c6af9
No known key found for this signature in database
1 changed files with 100 additions and 5 deletions
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105
ssh-agent.c
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@ -1,4 +1,4 @@
/* $OpenBSD: ssh-agent.c,v 1.300 2023/07/19 13:56:33 djm Exp $ */
/* $OpenBSD: ssh-agent.c,v 1.301 2023/12/18 14:46:12 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -247,6 +247,91 @@ free_dest_constraints(struct dest_constraint *dcs, size_t ndcs)
free(dcs);
}
static void
dup_dest_constraint_hop(const struct dest_constraint_hop *dch,
struct dest_constraint_hop *out)
{
u_int i;
int r;
out->user = dch->user == NULL ? NULL : xstrdup(dch->user);
out->hostname = dch->hostname == NULL ? NULL : xstrdup(dch->hostname);
out->is_ca = dch->is_ca;
out->nkeys = dch->nkeys;
out->keys = out->nkeys == 0 ? NULL :
xcalloc(out->nkeys, sizeof(*out->keys));
out->key_is_ca = out->nkeys == 0 ? NULL :
xcalloc(out->nkeys, sizeof(*out->key_is_ca));
for (i = 0; i < dch->nkeys; i++) {
if (dch->keys[i] != NULL &&
(r = sshkey_from_private(dch->keys[i],
&(out->keys[i]))) != 0)
fatal_fr(r, "copy key");
out->key_is_ca[i] = dch->key_is_ca[i];
}
}
static struct dest_constraint *
dup_dest_constraints(const struct dest_constraint *dcs, size_t ndcs)
{
size_t i;
struct dest_constraint *ret;
if (ndcs == 0)
return NULL;
ret = xcalloc(ndcs, sizeof(*ret));
for (i = 0; i < ndcs; i++) {
dup_dest_constraint_hop(&dcs[i].from, &ret[i].from);
dup_dest_constraint_hop(&dcs[i].to, &ret[i].to);
}
return ret;
}
#ifdef DEBUG_CONSTRAINTS
static void
dump_dest_constraint_hop(const struct dest_constraint_hop *dch)
{
u_int i;
char *fp;
debug_f("user %s hostname %s is_ca %d nkeys %u",
dch->user == NULL ? "(null)" : dch->user,
dch->hostname == NULL ? "(null)" : dch->hostname,
dch->is_ca, dch->nkeys);
for (i = 0; i < dch->nkeys; i++) {
fp = NULL;
if (dch->keys[i] != NULL &&
(fp = sshkey_fingerprint(dch->keys[i],
SSH_FP_HASH_DEFAULT, SSH_FP_DEFAULT)) == NULL)
fatal_f("fingerprint failed");
debug_f("key %u/%u: %s%s%s key_is_ca %d", i, dch->nkeys,
dch->keys[i] == NULL ? "" : sshkey_ssh_name(dch->keys[i]),
dch->keys[i] == NULL ? "" : " ",
dch->keys[i] == NULL ? "none" : fp,
dch->key_is_ca[i]);
free(fp);
}
}
#endif /* DEBUG_CONSTRAINTS */
static void
dump_dest_constraints(const char *context,
const struct dest_constraint *dcs, size_t ndcs)
{
#ifdef DEBUG_CONSTRAINTS
size_t i;
debug_f("%s: %zu constraints", context, ndcs);
for (i = 0; i < ndcs; i++) {
debug_f("constraint %zu / %zu: from: ", i, ndcs);
dump_dest_constraint_hop(&dcs[i].from);
debug_f("constraint %zu / %zu: to: ", i, ndcs);
dump_dest_constraint_hop(&dcs[i].to);
}
debug_f("done for %s", context);
#endif /* DEBUG_CONSTRAINTS */
}
static void
free_identity(Identity *id)
{
@ -518,13 +603,22 @@ process_request_identities(SocketEntry *e)
Identity *id;
struct sshbuf *msg, *keys;
int r;
u_int nentries = 0;
u_int i = 0, nentries = 0;
char *fp;
debug2_f("entering");
if ((msg = sshbuf_new()) == NULL || (keys = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
TAILQ_FOREACH(id, &idtab->idlist, next) {
if ((fp = sshkey_fingerprint(id->key, SSH_FP_HASH_DEFAULT,
SSH_FP_DEFAULT)) == NULL)
fatal_f("fingerprint failed");
debug_f("key %u / %u: %s %s", i++, idtab->nentries,
sshkey_ssh_name(id->key), fp);
dump_dest_constraints(__func__,
id->dest_constraints, id->ndest_constraints);
free(fp);
/* identity not visible, don't include in response */
if (identity_permitted(id, e, NULL, NULL, NULL) != 0)
continue;
@ -1224,6 +1318,7 @@ process_add_identity(SocketEntry *e)
sshbuf_reset(e->request);
goto out;
}
dump_dest_constraints(__func__, dest_constraints, ndest_constraints);
if (sk_provider != NULL) {
if (!sshkey_is_sk(k)) {
@ -1403,6 +1498,7 @@ process_add_smartcard_key(SocketEntry *e)
error_f("failed to parse constraints");
goto send;
}
dump_dest_constraints(__func__, dest_constraints, ndest_constraints);
if (e->nsession_ids != 0 && !remote_add_provider) {
verbose("failed PKCS#11 add of \"%.100s\": remote addition of "
"providers is disabled", provider);
@ -1438,10 +1534,9 @@ process_add_smartcard_key(SocketEntry *e)
}
id->death = death;
id->confirm = confirm;
id->dest_constraints = dest_constraints;
id->dest_constraints = dup_dest_constraints(
dest_constraints, ndest_constraints);
id->ndest_constraints = ndest_constraints;
dest_constraints = NULL; /* transferred */
ndest_constraints = 0;
TAILQ_INSERT_TAIL(&idtab->idlist, id, next);
idtab->nentries++;
success = 1;