226 lines
6.8 KiB
Diff
226 lines
6.8 KiB
Diff
diff --git a/parseconf.c b/parseconf.c
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index 3729818..ee1b8b4 100644
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--- a/parseconf.c
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+++ b/parseconf.c
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@@ -188,6 +188,7 @@ parseconf_str_array[] =
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{ "rsa_private_key_file", &tunable_rsa_private_key_file },
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{ "dsa_private_key_file", &tunable_dsa_private_key_file },
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{ "ca_certs_file", &tunable_ca_certs_file },
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+ { "ssl_sni_hostname", &tunable_ssl_sni_hostname },
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{ "cmds_denied", &tunable_cmds_denied },
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{ 0, 0 }
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};
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diff --git a/ssl.c b/ssl.c
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index 09ec96a..b622347 100644
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--- a/ssl.c
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+++ b/ssl.c
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@@ -41,6 +41,13 @@ static long bio_callback(
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BIO* p_bio, int oper, const char* p_arg, int argi, long argl, long retval);
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static int ssl_verify_callback(int verify_ok, X509_STORE_CTX* p_ctx);
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static DH *ssl_tmp_dh_callback(SSL *ssl, int is_export, int keylength);
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+static int ssl_alpn_callback(SSL* p_ssl,
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+ const unsigned char** p_out,
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+ unsigned char* outlen,
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+ const unsigned char* p_in,
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+ unsigned int inlen,
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+ void* p_arg);
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+static long ssl_sni_callback(SSL* p_ssl, int* p_al, void* p_arg);
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static int ssl_cert_digest(
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SSL* p_ssl, struct vsf_session* p_sess, struct mystr* p_str);
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static void maybe_log_shutdown_state(struct vsf_session* p_sess);
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@@ -285,6 +292,11 @@ ssl_init(struct vsf_session* p_sess)
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SSL_CTX_set_timeout(p_ctx, INT_MAX);
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}
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+ /* Set up ALPN to check for FTP protocol intention of client. */
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+ SSL_CTX_set_alpn_select_cb(p_ctx, ssl_alpn_callback, p_sess);
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+ /* Set up SNI callback for an optional hostname check. */
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+ SSL_CTX_set_tlsext_servername_callback(p_ctx, ssl_sni_callback);
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+ SSL_CTX_set_tlsext_servername_arg(p_ctx, p_sess);
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SSL_CTX_set_tmp_dh_callback(p_ctx, ssl_tmp_dh_callback);
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if (tunable_ecdh_param_file)
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@@ -871,6 +883,133 @@ ssl_tmp_dh_callback(SSL *ssl, int is_export, int keylength)
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return DH_get_dh(keylength);
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}
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+static int
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+ssl_alpn_callback(SSL* p_ssl,
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+ const unsigned char** p_out,
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+ unsigned char* outlen,
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+ const unsigned char* p_in,
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+ unsigned int inlen,
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+ void* p_arg) {
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+ unsigned int i;
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+ struct vsf_session* p_sess = (struct vsf_session*) p_arg;
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+ int is_ok = 0;
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+
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+ (void) p_ssl;
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+
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+ /* Initialize just in case. */
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+ *p_out = p_in;
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+ *outlen = 0;
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+
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+ for (i = 0; i < inlen; ++i) {
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+ unsigned int left = (inlen - i);
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+ if (left < 4) {
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+ continue;
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+ }
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+ if (p_in[i] == 3 && p_in[i + 1] == 'f' && p_in[i + 2] == 't' &&
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+ p_in[i + 3] == 'p')
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+ {
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+ is_ok = 1;
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+ *p_out = &p_in[i + 1];
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+ *outlen = 3;
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+ break;
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+ }
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+ }
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+
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+ if (!is_ok)
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+ {
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+ str_alloc_text(&debug_str, "ALPN rejection");
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+ vsf_log_line(p_sess, kVSFLogEntryDebug, &debug_str);
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+ }
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+ if (!is_ok || tunable_debug_ssl)
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+ {
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+ str_alloc_text(&debug_str, "ALPN data: ");
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+ for (i = 0; i < inlen; ++i) {
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+ str_append_char(&debug_str, p_in[i]);
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+ }
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+ vsf_log_line(p_sess, kVSFLogEntryDebug, &debug_str);
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+ }
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+
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+ if (is_ok)
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+ {
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+ return SSL_TLSEXT_ERR_OK;
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+ }
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+ else
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+ {
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+ return SSL_TLSEXT_ERR_ALERT_FATAL;
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+ }
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+}
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+
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+static long
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+ssl_sni_callback(SSL* p_ssl, int* p_al, void* p_arg)
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+{
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+ static struct mystr s_sni_expected_hostname;
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+ static struct mystr s_sni_received_hostname;
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+
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+ int servername_type;
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+ const char* p_sni_servername;
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+ struct vsf_session* p_sess = (struct vsf_session*) p_arg;
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+ int is_ok = 0;
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+
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+ (void) p_ssl;
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+ (void) p_arg;
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+
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+ if (tunable_ssl_sni_hostname)
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+ {
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+ str_alloc_text(&s_sni_expected_hostname, tunable_ssl_sni_hostname);
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+ }
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+
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+ /* The OpenSSL documentation says it is pre-initialized like this, but set
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+ * it just in case.
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+ */
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+ *p_al = SSL_AD_UNRECOGNIZED_NAME;
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+
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+ servername_type = SSL_get_servername_type(p_ssl);
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+ p_sni_servername = SSL_get_servername(p_ssl, TLSEXT_NAMETYPE_host_name);
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+ if (p_sni_servername != NULL) {
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+ str_alloc_text(&s_sni_received_hostname, p_sni_servername);
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+ }
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+
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+ if (str_isempty(&s_sni_expected_hostname))
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+ {
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+ is_ok = 1;
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+ }
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+ else if (servername_type != TLSEXT_NAMETYPE_host_name)
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+ {
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+ /* Fail. */
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+ str_alloc_text(&debug_str, "SNI bad type: ");
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+ str_append_ulong(&debug_str, servername_type);
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+ vsf_log_line(p_sess, kVSFLogEntryDebug, &debug_str);
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+ }
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+ else
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+ {
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+ if (!str_strcmp(&s_sni_expected_hostname, &s_sni_received_hostname))
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+ {
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+ is_ok = 1;
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+ }
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+ else
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+ {
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+ str_alloc_text(&debug_str, "SNI rejection");
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+ vsf_log_line(p_sess, kVSFLogEntryDebug, &debug_str);
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+ }
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+ }
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+
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+ if (!is_ok || tunable_debug_ssl)
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+ {
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+ str_alloc_text(&debug_str, "SNI hostname: ");
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+ str_append_str(&debug_str, &s_sni_received_hostname);
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+ vsf_log_line(p_sess, kVSFLogEntryDebug, &debug_str);
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+ }
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+
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+ if (is_ok)
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+ {
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+ return SSL_TLSEXT_ERR_OK;
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+ }
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+ else
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+ {
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+ return SSL_TLSEXT_ERR_ALERT_FATAL;
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+ }
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+}
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+
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void
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ssl_add_entropy(struct vsf_session* p_sess)
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{
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diff --git a/tunables.c b/tunables.c
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index c96c1ac..d8dfcde 100644
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--- a/tunables.c
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+++ b/tunables.c
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@@ -152,6 +152,7 @@ const char* tunable_ssl_ciphers;
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const char* tunable_rsa_private_key_file;
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const char* tunable_dsa_private_key_file;
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const char* tunable_ca_certs_file;
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+const char* tunable_ssl_sni_hostname;
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static void install_str_setting(const char* p_value, const char** p_storage);
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@@ -309,6 +310,7 @@ tunables_load_defaults()
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install_str_setting(0, &tunable_rsa_private_key_file);
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install_str_setting(0, &tunable_dsa_private_key_file);
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install_str_setting(0, &tunable_ca_certs_file);
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+ install_str_setting(0, &tunable_ssl_sni_hostname);
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}
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void
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diff --git a/tunables.h b/tunables.h
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index 8d50150..de6cab0 100644
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--- a/tunables.h
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+++ b/tunables.h
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@@ -157,6 +157,7 @@ extern const char* tunable_ssl_ciphers;
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extern const char* tunable_rsa_private_key_file;
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extern const char* tunable_dsa_private_key_file;
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extern const char* tunable_ca_certs_file;
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+extern const char* tunable_ssl_sni_hostname;
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extern const char* tunable_cmds_denied;
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#endif /* VSF_TUNABLES_H */
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diff --git a/vsftpd.conf.5 b/vsftpd.conf.5
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index 815773f..7006287 100644
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--- a/vsftpd.conf.5
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+++ b/vsftpd.conf.5
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@@ -1128,6 +1128,12 @@ for further details.
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Default: PROFILE=SYSTEM
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.TP
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+.B ssl_sni_hostname
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+If set, SSL connections will be rejected unless the SNI hostname in the
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+incoming handshakes matches this value.
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+
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+Default: (none)
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+.TP
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.B user_config_dir
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This powerful option allows the override of any config option specified in
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the manual page, on a per-user basis. Usage is simple, and is best illustrated
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