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upstream: factor out sshsk_ecdsa_assemble(); ok djm@ 

OpenBSD-Commit-ID: 2313761a3a84ccfe032874d638d3c363e0f14026
This commit is contained in:
markus@openbsd.org 2019-11-12 19:29:54 +00:00 committed by Damien Miller
parent 7c096c456f
commit cef84a062d
1 changed files with 59 additions and 37 deletions
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96
ssh-sk.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: ssh-sk.c,v 1.1 2019/10/31 21:16:20 djm Exp $ */
/* $OpenBSD: ssh-sk.c,v 1.2 2019/11/12 19:29:54 markus Exp $ */
/*
* Copyright (c) 2019 Google LLC
*
@ -143,6 +143,61 @@ sshsk_free_sign_response(struct sk_sign_response *r)
freezero(r, sizeof(*r));
};
/* Assemble key from response */
static int
sshsk_ecdsa_assemble(struct sk_enroll_response *resp, struct sshkey **keyp)
{
struct sshkey *key = NULL;
struct sshbuf *b = NULL;
EC_POINT *q = NULL;
int r;
*keyp = NULL;
if ((key = sshkey_new(KEY_ECDSA_SK)) == NULL) {
error("%s: sshkey_new failed", __func__);
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
key->ecdsa_nid = NID_X9_62_prime256v1;
if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid)) == NULL ||
(q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL ||
(b = sshbuf_new()) == NULL) {
error("%s: allocation failed", __func__);
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((r = sshbuf_put_string(b,
resp->public_key, resp->public_key_len)) != 0) {
error("%s: buffer error: %s", __func__, ssh_err(r));
goto out;
}
if ((r = sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa))) != 0) {
error("%s: parse key: %s", __func__, ssh_err(r));
r = SSH_ERR_INVALID_FORMAT;
goto out;
}
if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa), q) != 0) {
error("Security key returned invalid ECDSA key");
r = SSH_ERR_KEY_INVALID_EC_VALUE;
goto out;
}
if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
/* XXX assume it is a allocation error */
error("%s: allocation failed", __func__);
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
/* success */
*keyp = key;
key = NULL; /* transferred */
r = 0;
out:
EC_POINT_free(q);
sshkey_free(key);
sshbuf_free(b);
return r;
}
int
sshsk_enroll(const char *provider_path, const char *application,
uint8_t flags, struct sshbuf *challenge_buf, struct sshkey **keyp,
@ -155,8 +210,6 @@ sshsk_enroll(const char *provider_path, const char *application,
size_t challenge_len;
struct sk_enroll_response *resp = NULL;
int r = SSH_ERR_INTERNAL_ERROR;
struct sshbuf *b = NULL;
EC_POINT *q = NULL;
*keyp = NULL;
if (attest)
@ -206,49 +259,20 @@ sshsk_enroll(const char *provider_path, const char *application,
r = SSH_ERR_INVALID_FORMAT;
goto out;
}
/* Assemble key from response */
if ((key = sshkey_new(KEY_ECDSA_SK)) == NULL) {
error("%s: sshkey_new failed", __func__);
r = SSH_ERR_ALLOC_FAIL;
if ((r = sshsk_ecdsa_assemble(resp, &key)) != 0)
goto out;
}
key->ecdsa_nid = NID_X9_62_prime256v1;
key->sk_flags = flags;
if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid)) == NULL ||
(q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL ||
(key->sk_key_handle = sshbuf_new()) == NULL ||
(key->sk_reserved = sshbuf_new()) == NULL ||
(b = sshbuf_new()) == NULL) {
if ((key->sk_key_handle = sshbuf_new()) == NULL ||
(key->sk_reserved = sshbuf_new()) == NULL) {
error("%s: allocation failed", __func__);
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((r = sshbuf_put_string(b,
resp->public_key, resp->public_key_len)) != 0) {
error("%s: buffer error: %s", __func__, ssh_err(r));
goto out;
}
if ((key->sk_application = strdup(application)) == NULL) {
error("%s: strdup application failed", __func__);
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((r = sshbuf_get_ec(b, q, EC_KEY_get0_group(key->ecdsa))) != 0) {
error("%s: parse key: %s", __func__, ssh_err(r));
r = SSH_ERR_INVALID_FORMAT;
goto out;
}
if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa), q) != 0) {
error("Security key returned invalid ECDSA key");
r = SSH_ERR_KEY_INVALID_EC_VALUE;
goto out;
}
if (EC_KEY_set_public_key(key->ecdsa, q) != 1) {
/* XXX assume it is a allocation error */
error("%s: allocation failed", __func__);
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
if ((r = sshbuf_put(key->sk_key_handle, resp->key_handle,
resp->key_handle_len)) != 0) {
error("%s: buffer error: %s", __func__, ssh_err(r));
@ -273,9 +297,7 @@ sshsk_enroll(const char *provider_path, const char *application,
key = NULL; /* transferred */
r = 0;
out:
EC_POINT_free(q);
sshsk_free(skp);
sshbuf_free(b);
sshkey_free(key);
sshsk_free_enroll_response(resp);
explicit_bzero(randchall, sizeof(randchall));