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Improve CRL reloading.

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When a CRL is reloaded, disconnect any TLS clients that authenticated
with a certificate that is now in the CRL.

Improve log messages while here.
This commit is contained in:
Joris Vink 2022-09-05 10:59:28 +02:00
parent 0de5d5e4c7
commit 80db912c34
1 changed files with 72 additions and 23 deletions
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95
src/tls_openssl.c
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@ -358,7 +358,9 @@ kore_tls_domain_crl(struct kore_domain *dom, const void *pem, size_t pemlen)
int err;
BIO *in;
X509_CRL *crl;
X509_REVOKED *rev;
X509_STORE *store;
struct connection *c, *next;
ERR_clear_error();
in = BIO_new_mem_buf(pem, pemlen);
@ -369,6 +371,9 @@ kore_tls_domain_crl(struct kore_domain *dom, const void *pem, size_t pemlen)
return;
}
X509_STORE_set_flags(store,
X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL);
for (;;) {
crl = PEM_read_bio_X509_CRL(in, NULL, NULL, NULL);
if (crl == NULL) {
@ -395,12 +400,42 @@ kore_tls_domain_crl(struct kore_domain *dom, const void *pem, size_t pemlen)
X509_CRL_free(crl);
continue;
}
/*
* Check if any accepted connection authenticated themselves
* with a now revoked certificate.
*/
for (c = TAILQ_FIRST(&connections); c != NULL; c = next) {
next = TAILQ_NEXT(c, list);
if (c->proto != CONN_PROTO_HTTP)
continue;
/*
* Prune any connection that is currently not yet done
* with the TLS handshake. This is to prevent a race
* where a handshake could not yet be complete but
* did pass the x509 verification step and their cert
* was revoked in this CRL update.
*/
if (c->state == CONN_STATE_TLS_SHAKE) {
kore_connection_disconnect(c);
continue;
}
if (c->tls_cert == NULL)
continue;
if (X509_CRL_get0_by_cert(crl, &rev, c->tls_cert) != 1)
continue;
kore_connection_log(c,
"connection removed, its certificate is revoked");
kore_connection_disconnect(c);
}
}
BIO_free(in);
X509_STORE_set_flags(store,
X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL);
}
void
@ -416,13 +451,13 @@ kore_tls_connection_accept(struct connection *c)
int r;
if (primary_dom == NULL) {
kore_log(LOG_NOTICE,
kore_connection_log(c,
"TLS handshake but no TLS configured on server");
return (KORE_RESULT_ERROR);
}
if (primary_dom->tls_ctx == NULL) {
kore_log(LOG_NOTICE,
kore_connection_log(c,
"TLS configuration for %s not yet complete",
primary_dom->domain);
return (KORE_RESULT_ERROR);
@ -436,8 +471,11 @@ kore_tls_connection_accept(struct connection *c)
SSL_set_fd(c->tls, c->fd);
SSL_set_accept_state(c->tls);
if (!SSL_set_ex_data(c->tls, 0, c))
if (!SSL_set_ex_data(c->tls, 0, c)) {
kore_connection_log(c,
"SSL_set_ex_data: %s", ssl_errno_s);
return (KORE_RESULT_ERROR);
}
if (primary_dom->cafile != NULL)
c->flags |= CONN_LOG_TLS_FAILURE;
@ -454,7 +492,7 @@ kore_tls_connection_accept(struct connection *c)
return (KORE_RESULT_RETRY);
default:
if (c->flags & CONN_LOG_TLS_FAILURE) {
kore_log(LOG_NOTICE,
kore_connection_log(c,
"SSL_accept: %s", ssl_errno_s);
}
return (KORE_RESULT_ERROR);
@ -463,7 +501,7 @@ kore_tls_connection_accept(struct connection *c)
#if defined(KORE_USE_ACME)
if (c->proto == CONN_PROTO_ACME_ALPN) {
kore_log(LOG_INFO, "disconnecting acme client");
kore_connection_log(c, "disconnecting ACME client");
kore_connection_disconnect(c);
return (KORE_RESULT_ERROR);
}
@ -472,7 +510,7 @@ kore_tls_connection_accept(struct connection *c)
if (SSL_get_verify_mode(c->tls) & SSL_VERIFY_PEER) {
c->tls_cert = SSL_get_peer_certificate(c->tls);
if (c->tls_cert == NULL) {
kore_log(LOG_NOTICE, "no peer certificate");
kore_connection_log(c, "no peer certificate returned");
return (KORE_RESULT_ERROR);
}
} else {
@ -518,8 +556,8 @@ kore_tls_read(struct connection *c, size_t *bytes)
/* FALLTHROUGH */
default:
if (c->flags & CONN_LOG_TLS_FAILURE) {
kore_log(LOG_NOTICE,
"SSL_read(): %s", ssl_errno_s);
kore_connection_log(c, "SSL_read: %s",
ssl_errno_s);
}
return (KORE_RESULT_ERROR);
}
@ -566,8 +604,8 @@ kore_tls_write(struct connection *c, size_t len, size_t *written)
/* FALLTHROUGH */
default:
if (c->flags & CONN_LOG_TLS_FAILURE) {
kore_log(LOG_NOTICE,
"SSL_write(): %s", ssl_errno_s);
kore_connection_log(c,
"SSL_write: %s", ssl_errno_s);
}
return (KORE_RESULT_ERROR);
}
@ -652,8 +690,10 @@ kore_tls_x509_subject_name(struct connection *c)
{
X509_NAME *name;
if ((name = X509_get_subject_name(c->tls_cert)) == NULL)
kore_log(LOG_NOTICE, "X509_get_subject_name: %s", ssl_errno_s);
if ((name = X509_get_subject_name(c->tls_cert)) == NULL) {
kore_connection_log(c,
"X509_get_subject_name: %s", ssl_errno_s);
}
return (name);
}
@ -664,7 +704,7 @@ kore_tls_x509_issuer_name(struct connection *c)
X509_NAME *name;
if ((name = X509_get_issuer_name(c->tls_cert)) == NULL)
kore_log(LOG_NOTICE, "X509_get_issuer_name: %s", ssl_errno_s);
kore_connection_log(c, "X509_get_issuer_name: %s", ssl_errno_s);
return (name);
}
@ -737,7 +777,7 @@ kore_tls_x509_data(struct connection *c, u_int8_t **ptr, size_t *olen)
u_int8_t *der, *pp;
if ((len = i2d_X509(c->tls_cert, NULL)) <= 0) {
kore_log(LOG_NOTICE, "i2d_X509: %s", ssl_errno_s);
kore_connection_log(c, "i2d_X509: %s", ssl_errno_s);
return (KORE_RESULT_ERROR);
}
@ -746,7 +786,7 @@ kore_tls_x509_data(struct connection *c, u_int8_t **ptr, size_t *olen)
if (i2d_X509(c->tls_cert, &pp) <= 0) {
kore_free(der);
kore_log(LOG_NOTICE, "i2d_X509: %s", ssl_errno_s);
kore_connection_log(c, "i2d_X509: %s", ssl_errno_s);
return (KORE_RESULT_ERROR);
}
@ -1044,9 +1084,18 @@ tls_keymgr_msg_response(struct kore_msg *msg, const void *data)
static int
tls_domain_x509_verify(int ok, X509_STORE_CTX *ctx)
{
X509 *cert;
const char *text;
int error, depth;
struct connection *c;
SSL *tls;
X509 *cert;
const char *text;
int error, depth;
if ((tls = X509_STORE_CTX_get_ex_data(ctx,
SSL_get_ex_data_X509_STORE_CTX_idx())) == NULL)
fatal("X509_STORE_CTX_get_ex_data: no data");
if ((c = SSL_get_ex_data(tls, 0)) == NULL)
fatal("no connection data in %s", __func__);
error = X509_STORE_CTX_get_error(ctx);
cert = X509_STORE_CTX_get_current_cert(ctx);
@ -1055,8 +1104,8 @@ tls_domain_x509_verify(int ok, X509_STORE_CTX *ctx)
text = X509_verify_cert_error_string(error);
depth = X509_STORE_CTX_get_error_depth(ctx);
kore_log(LOG_WARNING, "X509 verification error depth:%d - %s",
depth, text);
kore_connection_log(c,
"X509 verification error depth:%d - %s", depth, text);
/* Continue on CRL validity errors. */
switch (error) {