Import LibreSSL 3.2.0

1 files changed, 907 insertions, 0 deletions

diff --git a/tls_config.c b/tls_config.c
new file mode 100644
index 0000000..ed47170
--- /dev/null
+++ b/tls_config.c
@@ -0,0 +1,907 @@
+/* $OpenBSD: tls_config.c,v 1.58 2020/01/20 08:39:21 jsing Exp $ */
+/*
+ * Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/stat.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <tls.h>
+
+#include "tls_internal.h"
+
+static const char default_ca_file[] = TLS_DEFAULT_CA_FILE;
+
+const char *
+tls_default_ca_cert_file(void)
+{
+	return default_ca_file;
+}
+
+int
+tls_config_load_file(struct tls_error *error, const char *filetype,
+    const char *filename, char **buf, size_t *len)
+{
+	struct stat st;
+	int fd = -1;
+	ssize_t n;
+
+	free(*buf);
+	*buf = NULL;
+	*len = 0;
+
+	if ((fd = open(filename, O_RDONLY)) == -1) {
+		tls_error_set(error, "failed to open %s file '%s'",
+		    filetype, filename);
+		goto err;
+	}
+	if (fstat(fd, &st) != 0) {
+		tls_error_set(error, "failed to stat %s file '%s'",
+		    filetype, filename);
+		goto err;
+	}
+	if (st.st_size < 0)
+		goto err;
+	*len = (size_t)st.st_size;
+	if ((*buf = malloc(*len)) == NULL) {
+		tls_error_set(error, "failed to allocate buffer for "
+		    "%s file", filetype);
+		goto err;
+	}
+	n = read(fd, *buf, *len);
+	if (n < 0 || (size_t)n != *len) {
+		tls_error_set(error, "failed to read %s file '%s'",
+		    filetype, filename);
+		goto err;
+	}
+	close(fd);
+	return 0;
+
+ err:
+	if (fd != -1)
+		close(fd);
+	freezero(*buf, *len);
+	*buf = NULL;
+	*len = 0;
+
+	return -1;
+}
+
+struct tls_config *
+tls_config_new_internal(void)
+{
+	struct tls_config *config;
+	unsigned char sid[TLS_MAX_SESSION_ID_LENGTH];
+
+	if ((config = calloc(1, sizeof(*config))) == NULL)
+		return (NULL);
+
+	if (pthread_mutex_init(&config->mutex, NULL) != 0)
+		goto err;
+
+	config->refcount = 1;
+	config->session_fd = -1;
+
+	if ((config->keypair = tls_keypair_new()) == NULL)
+		goto err;
+
+	/*
+	 * Default configuration.
+	 */
+	if (tls_config_set_dheparams(config, "none") != 0)
+		goto err;
+	if (tls_config_set_ecdhecurves(config, "default") != 0)
+		goto err;
+	if (tls_config_set_ciphers(config, "secure") != 0)
+		goto err;
+
+	if (tls_config_set_protocols(config, TLS_PROTOCOLS_DEFAULT) != 0)
+		goto err;
+	if (tls_config_set_verify_depth(config, 6) != 0)
+		goto err;
+
+	/*
+	 * Set session ID context to a random value.  For the simple case
+	 * of a single process server this is good enough. For multiprocess
+	 * servers the session ID needs to be set by the caller.
+	 */
+	arc4random_buf(sid, sizeof(sid));
+	if (tls_config_set_session_id(config, sid, sizeof(sid)) != 0)
+		goto err;
+	config->ticket_keyrev = arc4random();
+	config->ticket_autorekey = 1;
+
+	tls_config_prefer_ciphers_server(config);
+
+	tls_config_verify(config);
+
+	return (config);
+
+ err:
+	tls_config_free(config);
+	return (NULL);
+}
+
+struct tls_config *
+tls_config_new(void)
+{
+	if (tls_init() == -1)
+		return (NULL);
+
+	return tls_config_new_internal();
+}
+
+void
+tls_config_free(struct tls_config *config)
+{
+	struct tls_keypair *kp, *nkp;
+	int refcount;
+
+	if (config == NULL)
+		return;
+
+	pthread_mutex_lock(&config->mutex);
+	refcount = --config->refcount;
+	pthread_mutex_unlock(&config->mutex);
+
+	if (refcount > 0)
+		return;
+
+	for (kp = config->keypair; kp != NULL; kp = nkp) {
+		nkp = kp->next;
+		tls_keypair_free(kp);
+	}
+
+	free(config->error.msg);
+
+	free(config->alpn);
+	free((char *)config->ca_mem);
+	free((char *)config->ca_path);
+	free((char *)config->ciphers);
+	free((char *)config->crl_mem);
+	free(config->ecdhecurves);
+
+	free(config);
+}
+
+static void
+tls_config_keypair_add(struct tls_config *config, struct tls_keypair *keypair)
+{
+	struct tls_keypair *kp;
+
+	kp = config->keypair;
+	while (kp->next != NULL)
+		kp = kp->next;
+
+	kp->next = keypair;
+}
+
+const char *
+tls_config_error(struct tls_config *config)
+{
+	return config->error.msg;
+}
+
+void
+tls_config_clear_keys(struct tls_config *config)
+{
+	struct tls_keypair *kp;
+
+	for (kp = config->keypair; kp != NULL; kp = kp->next)
+		tls_keypair_clear_key(kp);
+}
+
+int
+tls_config_parse_protocols(uint32_t *protocols, const char *protostr)
+{
+	uint32_t proto, protos = 0;
+	char *s, *p, *q;
+	int negate;
+
+	if (protostr == NULL) {
+		*protocols = TLS_PROTOCOLS_DEFAULT;
+		return (0);
+	}
+
+	if ((s = strdup(protostr)) == NULL)
+		return (-1);
+
+	q = s;
+	while ((p = strsep(&q, ",:")) != NULL) {
+		while (*p == ' ' || *p == '\t')
+			p++;
+
+		negate = 0;
+		if (*p == '!') {
+			negate = 1;
+			p++;
+		}
+
+		if (negate && protos == 0)
+			protos = TLS_PROTOCOLS_ALL;
+
+		proto = 0;
+		if (strcasecmp(p, "all") == 0 ||
+		    strcasecmp(p, "legacy") == 0)
+			proto = TLS_PROTOCOLS_ALL;
+		else if (strcasecmp(p, "default") == 0 ||
+		    strcasecmp(p, "secure") == 0)
+			proto = TLS_PROTOCOLS_DEFAULT;
+		if (strcasecmp(p, "tlsv1") == 0)
+			proto = TLS_PROTOCOL_TLSv1;
+		else if (strcasecmp(p, "tlsv1.0") == 0)
+			proto = TLS_PROTOCOL_TLSv1_0;
+		else if (strcasecmp(p, "tlsv1.1") == 0)
+			proto = TLS_PROTOCOL_TLSv1_1;
+		else if (strcasecmp(p, "tlsv1.2") == 0)
+			proto = TLS_PROTOCOL_TLSv1_2;
+		else if (strcasecmp(p, "tlsv1.3") == 0)
+			proto = TLS_PROTOCOL_TLSv1_3;
+
+		if (proto == 0) {
+			free(s);
+			return (-1);
+		}
+
+		if (negate)
+			protos &= ~proto;
+		else
+			protos |= proto;
+	}
+
+	*protocols = protos;
+
+	free(s);
+
+	return (0);
+}
+
+static int
+tls_config_parse_alpn(struct tls_config *config, const char *alpn,
+    char **alpn_data, size_t *alpn_len)
+{
+	size_t buf_len, i, len;
+	char *buf = NULL;
+	char *s = NULL;
+	char *p, *q;
+
+	free(*alpn_data);
+	*alpn_data = NULL;
+	*alpn_len = 0;
+
+	if ((buf_len = strlen(alpn) + 1) > 65535) {
+		tls_config_set_errorx(config, "alpn too large");
+		goto err;
+	}
+
+	if ((buf = malloc(buf_len)) == NULL) {
+		tls_config_set_errorx(config, "out of memory");
+		goto err;
+	}
+
+	if ((s = strdup(alpn)) == NULL) {
+		tls_config_set_errorx(config, "out of memory");
+		goto err;
+	}
+
+	i = 0;
+	q = s;
+	while ((p = strsep(&q, ",")) != NULL) {
+		if ((len = strlen(p)) == 0) {
+			tls_config_set_errorx(config,
+			    "alpn protocol with zero length");
+			goto err;
+		}
+		if (len > 255) {
+			tls_config_set_errorx(config,
+			    "alpn protocol too long");
+			goto err;
+		}
+		buf[i++] = len & 0xff;
+		memcpy(&buf[i], p, len);
+		i += len;
+	}
+
+	free(s);
+
+	*alpn_data = buf;
+	*alpn_len = buf_len;
+
+	return (0);
+
+ err:
+	free(buf);
+	free(s);
+
+	return (-1);
+}
+
+int
+tls_config_set_alpn(struct tls_config *config, const char *alpn)
+{
+	return tls_config_parse_alpn(config, alpn, &config->alpn,
+	    &config->alpn_len);
+}
+
+static int
+tls_config_add_keypair_file_internal(struct tls_config *config,
+    const char *cert_file, const char *key_file, const char *ocsp_file)
+{
+	struct tls_keypair *keypair;
+
+	if ((keypair = tls_keypair_new()) == NULL)
+		return (-1);
+	if (tls_keypair_set_cert_file(keypair, &config->error, cert_file) != 0)
+		goto err;
+	if (tls_keypair_set_key_file(keypair, &config->error, key_file) != 0)
+		goto err;
+	if (ocsp_file != NULL &&
+	    tls_keypair_set_ocsp_staple_file(keypair, &config->error,
+		ocsp_file) != 0)
+		goto err;
+
+	tls_config_keypair_add(config, keypair);
+
+	return (0);
+
+ err:
+	tls_keypair_free(keypair);
+	return (-1);
+}
+
+static int
+tls_config_add_keypair_mem_internal(struct tls_config *config, const uint8_t *cert,
+    size_t cert_len, const uint8_t *key, size_t key_len,
+    const uint8_t *staple, size_t staple_len)
+{
+	struct tls_keypair *keypair;
+
+	if ((keypair = tls_keypair_new()) == NULL)
+		return (-1);
+	if (tls_keypair_set_cert_mem(keypair, &config->error, cert, cert_len) != 0)
+		goto err;
+	if (tls_keypair_set_key_mem(keypair, &config->error, key, key_len) != 0)
+		goto err;
+	if (staple != NULL &&
+	    tls_keypair_set_ocsp_staple_mem(keypair, &config->error, staple,
+		staple_len) != 0)
+		goto err;
+
+	tls_config_keypair_add(config, keypair);
+
+	return (0);
+
+ err:
+	tls_keypair_free(keypair);
+	return (-1);
+}
+
+int
+tls_config_add_keypair_mem(struct tls_config *config, const uint8_t *cert,
+    size_t cert_len, const uint8_t *key, size_t key_len)
+{
+	return tls_config_add_keypair_mem_internal(config, cert, cert_len, key,
+	    key_len, NULL, 0);
+}
+
+int
+tls_config_add_keypair_file(struct tls_config *config,
+    const char *cert_file, const char *key_file)
+{
+	return tls_config_add_keypair_file_internal(config, cert_file,
+	    key_file, NULL);
+}
+
+int
+tls_config_add_keypair_ocsp_mem(struct tls_config *config, const uint8_t *cert,
+    size_t cert_len, const uint8_t *key, size_t key_len, const uint8_t *staple,
+    size_t staple_len)
+{
+	return tls_config_add_keypair_mem_internal(config, cert, cert_len, key,
+	    key_len, staple, staple_len);
+}
+
+int
+tls_config_add_keypair_ocsp_file(struct tls_config *config,
+    const char *cert_file, const char *key_file, const char *ocsp_file)
+{
+	return tls_config_add_keypair_file_internal(config, cert_file,
+	    key_file, ocsp_file);
+}
+
+int
+tls_config_set_ca_file(struct tls_config *config, const char *ca_file)
+{
+	return tls_config_load_file(&config->error, "CA", ca_file,
+	    &config->ca_mem, &config->ca_len);
+}
+
+int
+tls_config_set_ca_path(struct tls_config *config, const char *ca_path)
+{
+	return tls_set_string(&config->ca_path, ca_path);
+}
+
+int
+tls_config_set_ca_mem(struct tls_config *config, const uint8_t *ca, size_t len)
+{
+	return tls_set_mem(&config->ca_mem, &config->ca_len, ca, len);
+}
+
+int
+tls_config_set_cert_file(struct tls_config *config, const char *cert_file)
+{
+	return tls_keypair_set_cert_file(config->keypair, &config->error,
+	    cert_file);
+}
+
+int
+tls_config_set_cert_mem(struct tls_config *config, const uint8_t *cert,
+    size_t len)
+{
+	return tls_keypair_set_cert_mem(config->keypair, &config->error,
+	    cert, len);
+}
+
+int
+tls_config_set_ciphers(struct tls_config *config, const char *ciphers)
+{
+	SSL_CTX *ssl_ctx = NULL;
+
+	if (ciphers == NULL ||
+	    strcasecmp(ciphers, "default") == 0 ||
+	    strcasecmp(ciphers, "secure") == 0)
+		ciphers = TLS_CIPHERS_DEFAULT;
+	else if (strcasecmp(ciphers, "compat") == 0)
+		ciphers = TLS_CIPHERS_COMPAT;
+	else if (strcasecmp(ciphers, "legacy") == 0)
+		ciphers = TLS_CIPHERS_LEGACY;
+	else if (strcasecmp(ciphers, "all") == 0 ||
+	    strcasecmp(ciphers, "insecure") == 0)
+		ciphers = TLS_CIPHERS_ALL;
+
+	if ((ssl_ctx = SSL_CTX_new(SSLv23_method())) == NULL) {
+		tls_config_set_errorx(config, "out of memory");
+		goto err;
+	}
+	if (SSL_CTX_set_cipher_list(ssl_ctx, ciphers) != 1) {
+		tls_config_set_errorx(config, "no ciphers for '%s'", ciphers);
+		goto err;
+	}
+
+	SSL_CTX_free(ssl_ctx);
+	return tls_set_string(&config->ciphers, ciphers);
+
+ err:
+	SSL_CTX_free(ssl_ctx);
+	return -1;
+}
+
+int
+tls_config_set_crl_file(struct tls_config *config, const char *crl_file)
+{
+	return tls_config_load_file(&config->error, "CRL", crl_file,
+	    &config->crl_mem, &config->crl_len);
+}
+
+int
+tls_config_set_crl_mem(struct tls_config *config, const uint8_t *crl,
+    size_t len)
+{
+	return tls_set_mem(&config->crl_mem, &config->crl_len, crl, len);
+}
+
+int
+tls_config_set_dheparams(struct tls_config *config, const char *params)
+{
+	int keylen;
+
+	if (params == NULL || strcasecmp(params, "none") == 0)
+		keylen = 0;
+	else if (strcasecmp(params, "auto") == 0)
+		keylen = -1;
+	else if (strcasecmp(params, "legacy") == 0)
+		keylen = 1024;
+	else {
+		tls_config_set_errorx(config, "invalid dhe param '%s'", params);
+		return (-1);
+	}
+
+	config->dheparams = keylen;
+
+	return (0);
+}
+
+int
+tls_config_set_ecdhecurve(struct tls_config *config, const char *curve)
+{
+	if (curve == NULL ||
+	    strcasecmp(curve, "none") == 0 ||
+	    strcasecmp(curve, "auto") == 0) {
+		curve = TLS_ECDHE_CURVES;
+	} else if (strchr(curve, ',') != NULL || strchr(curve, ':') != NULL) {
+		tls_config_set_errorx(config, "invalid ecdhe curve '%s'",
+		    curve);
+		return (-1);
+	}
+
+	return tls_config_set_ecdhecurves(config, curve);
+}
+
+int
+tls_config_set_ecdhecurves(struct tls_config *config, const char *curves)
+{
+	int *curves_list = NULL, *curves_new;
+	size_t curves_num = 0;
+	char *cs = NULL;
+	char *p, *q;
+	int rv = -1;
+	int nid;
+
+	free(config->ecdhecurves);
+	config->ecdhecurves = NULL;
+	config->ecdhecurves_len = 0;
+
+	if (curves == NULL || strcasecmp(curves, "default") == 0)
+		curves = TLS_ECDHE_CURVES;
+
+	if ((cs = strdup(curves)) == NULL) {
+		tls_config_set_errorx(config, "out of memory");
+		goto err;
+	}
+
+	q = cs;
+	while ((p = strsep(&q, ",:")) != NULL) {
+		while (*p == ' ' || *p == '\t')
+			p++;
+
+		nid = OBJ_sn2nid(p);
+		if (nid == NID_undef)
+			nid = OBJ_ln2nid(p);
+		if (nid == NID_undef)
+			nid = EC_curve_nist2nid(p);
+		if (nid == NID_undef) {
+			tls_config_set_errorx(config,
+			    "invalid ecdhe curve '%s'", p);
+			goto err;
+		}
+
+		if ((curves_new = reallocarray(curves_list, curves_num + 1,
+		    sizeof(int))) == NULL) {
+			tls_config_set_errorx(config, "out of memory");
+			goto err;
+		}
+		curves_list = curves_new;
+		curves_list[curves_num] = nid;
+		curves_num++;
+	}
+
+	config->ecdhecurves = curves_list;
+	config->ecdhecurves_len = curves_num;
+	curves_list = NULL;
+
+	rv = 0;
+
+ err:
+	free(cs);
+	free(curves_list);
+
+	return (rv);
+}
+
+int
+tls_config_set_key_file(struct tls_config *config, const char *key_file)
+{
+	return tls_keypair_set_key_file(config->keypair, &config->error,
+	    key_file);
+}
+
+int
+tls_config_set_key_mem(struct tls_config *config, const uint8_t *key,
+    size_t len)
+{
+	return tls_keypair_set_key_mem(config->keypair, &config->error,
+	    key, len);
+}
+
+static int
+tls_config_set_keypair_file_internal(struct tls_config *config,
+    const char *cert_file, const char *key_file, const char *ocsp_file)
+{
+	if (tls_config_set_cert_file(config, cert_file) != 0)
+		return (-1);
+	if (tls_config_set_key_file(config, key_file) != 0)
+		return (-1);
+	if (ocsp_file != NULL &&
+	    tls_config_set_ocsp_staple_file(config, ocsp_file) != 0)
+		return (-1);
+
+	return (0);
+}
+
+static int
+tls_config_set_keypair_mem_internal(struct tls_config *config, const uint8_t *cert,
+    size_t cert_len, const uint8_t *key, size_t key_len,
+    const uint8_t *staple, size_t staple_len)
+{
+	if (tls_config_set_cert_mem(config, cert, cert_len) != 0)
+		return (-1);
+	if (tls_config_set_key_mem(config, key, key_len) != 0)
+		return (-1);
+	if ((staple != NULL) &&
+	    (tls_config_set_ocsp_staple_mem(config, staple, staple_len) != 0))
+		return (-1);
+
+	return (0);
+}
+
+int
+tls_config_set_keypair_file(struct tls_config *config,
+    const char *cert_file, const char *key_file)
+{
+	return tls_config_set_keypair_file_internal(config, cert_file, key_file,
+	    NULL);
+}
+
+int
+tls_config_set_keypair_mem(struct tls_config *config, const uint8_t *cert,
+    size_t cert_len, const uint8_t *key, size_t key_len)
+{
+	return tls_config_set_keypair_mem_internal(config, cert, cert_len,
+	    key, key_len, NULL, 0);
+}
+
+int
+tls_config_set_keypair_ocsp_file(struct tls_config *config,
+    const char *cert_file, const char *key_file, const char *ocsp_file)
+{
+	return tls_config_set_keypair_file_internal(config, cert_file, key_file,
+	    ocsp_file);
+}
+
+int
+tls_config_set_keypair_ocsp_mem(struct tls_config *config, const uint8_t *cert,
+    size_t cert_len, const uint8_t *key, size_t key_len,
+    const uint8_t *staple, size_t staple_len)
+{
+	return tls_config_set_keypair_mem_internal(config, cert, cert_len,
+	    key, key_len, staple, staple_len);
+}
+
+
+int
+tls_config_set_protocols(struct tls_config *config, uint32_t protocols)
+{
+	config->protocols = protocols;
+
+	return (0);
+}
+
+int
+tls_config_set_session_fd(struct tls_config *config, int session_fd)
+{
+	struct stat sb;
+	mode_t mugo;
+
+	if (session_fd == -1) {
+		config->session_fd = session_fd;
+		return (0);
+	}
+
+	if (fstat(session_fd, &sb) == -1) {
+		tls_config_set_error(config, "failed to stat session file");
+		return (-1);
+	}
+	if (!S_ISREG(sb.st_mode)) {
+		tls_config_set_errorx(config,
+		    "session file is not a regular file");
+		return (-1);
+	}
+
+	if (sb.st_uid != getuid()) {
+		tls_config_set_errorx(config, "session file has incorrect "
+		    "owner (uid %i != %i)", sb.st_uid, getuid());
+		return (-1);
+	}
+	mugo = sb.st_mode & (S_IRWXU|S_IRWXG|S_IRWXO);
+	if (mugo != (S_IRUSR|S_IWUSR)) {
+		tls_config_set_errorx(config, "session file has incorrect "
+		    "permissions (%o != 600)", mugo);
+		return (-1);
+	}
+
+	config->session_fd = session_fd;
+
+	return (0);
+}
+
+int
+tls_config_set_verify_depth(struct tls_config *config, int verify_depth)
+{
+	config->verify_depth = verify_depth;
+
+	return (0);
+}
+
+void
+tls_config_prefer_ciphers_client(struct tls_config *config)
+{
+	config->ciphers_server = 0;
+}
+
+void
+tls_config_prefer_ciphers_server(struct tls_config *config)
+{
+	config->ciphers_server = 1;
+}
+
+void
+tls_config_insecure_noverifycert(struct tls_config *config)
+{
+	config->verify_cert = 0;
+}
+
+void
+tls_config_insecure_noverifyname(struct tls_config *config)
+{
+	config->verify_name = 0;
+}
+
+void
+tls_config_insecure_noverifytime(struct tls_config *config)
+{
+	config->verify_time = 0;
+}
+
+void
+tls_config_verify(struct tls_config *config)
+{
+	config->verify_cert = 1;
+	config->verify_name = 1;
+	config->verify_time = 1;
+}
+
+void
+tls_config_ocsp_require_stapling(struct tls_config *config)
+{
+	config->ocsp_require_stapling = 1;
+}
+
+void
+tls_config_verify_client(struct tls_config *config)
+{
+	config->verify_client = 1;
+}
+
+void
+tls_config_verify_client_optional(struct tls_config *config)
+{
+	config->verify_client = 2;
+}
+
+void
+tls_config_skip_private_key_check(struct tls_config *config)
+{
+	config->skip_private_key_check = 1;
+}
+
+int
+tls_config_set_ocsp_staple_file(struct tls_config *config, const char *staple_file)
+{
+	return tls_keypair_set_ocsp_staple_file(config->keypair, &config->error,
+	    staple_file);
+}
+
+int
+tls_config_set_ocsp_staple_mem(struct tls_config *config, const uint8_t *staple,
+    size_t len)
+{
+	return tls_keypair_set_ocsp_staple_mem(config->keypair, &config->error,
+	    staple, len);
+}
+
+int
+tls_config_set_session_id(struct tls_config *config,
+    const unsigned char *session_id, size_t len)
+{
+	if (len > TLS_MAX_SESSION_ID_LENGTH) {
+		tls_config_set_errorx(config, "session ID too large");
+		return (-1);
+	}
+	memset(config->session_id, 0, sizeof(config->session_id));
+	memcpy(config->session_id, session_id, len);
+	return (0);
+}
+
+int
+tls_config_set_session_lifetime(struct tls_config *config, int lifetime)
+{
+	if (lifetime > TLS_MAX_SESSION_TIMEOUT) {
+		tls_config_set_errorx(config, "session lifetime too large");
+		return (-1);
+	}
+	if (lifetime != 0 && lifetime < TLS_MIN_SESSION_TIMEOUT) {
+		tls_config_set_errorx(config, "session lifetime too small");
+		return (-1);
+	}
+
+	config->session_lifetime = lifetime;
+	return (0);
+}
+
+int
+tls_config_add_ticket_key(struct tls_config *config, uint32_t keyrev,
+    unsigned char *key, size_t keylen)
+{
+	struct tls_ticket_key newkey;
+	int i;
+
+	if (TLS_TICKET_KEY_SIZE != keylen ||
+	    sizeof(newkey.aes_key) + sizeof(newkey.hmac_key) > keylen) {
+		tls_config_set_errorx(config,
+		    "wrong amount of ticket key data");
+		return (-1);
+	}
+
+	keyrev = htonl(keyrev);
+	memset(&newkey, 0, sizeof(newkey));
+	memcpy(newkey.key_name, &keyrev, sizeof(keyrev));
+	memcpy(newkey.aes_key, key, sizeof(newkey.aes_key));
+	memcpy(newkey.hmac_key, key + sizeof(newkey.aes_key),
+	    sizeof(newkey.hmac_key));
+	newkey.time = time(NULL);
+
+	for (i = 0; i < TLS_NUM_TICKETS; i++) {
+		struct tls_ticket_key *tk = &config->ticket_keys[i];
+		if (memcmp(newkey.key_name, tk->key_name,
+		    sizeof(tk->key_name)) != 0)
+			continue;
+
+		/* allow re-entry of most recent key */
+		if (i == 0 && memcmp(newkey.aes_key, tk->aes_key,
+		    sizeof(tk->aes_key)) == 0 && memcmp(newkey.hmac_key,
+		    tk->hmac_key, sizeof(tk->hmac_key)) == 0)
+			return (0);
+		tls_config_set_errorx(config, "ticket key already present");
+		return (-1);
+	}
+
+	memmove(&config->ticket_keys[1], &config->ticket_keys[0],
+	    sizeof(config->ticket_keys) - sizeof(config->ticket_keys[0]));
+	config->ticket_keys[0] = newkey;
+
+	config->ticket_autorekey = 0;
+
+	return (0);
+}
+
+int
+tls_config_ticket_autorekey(struct tls_config *config)
+{
+	unsigned char key[TLS_TICKET_KEY_SIZE];
+	int rv;
+
+	arc4random_buf(key, sizeof(key));
+	rv = tls_config_add_ticket_key(config, config->ticket_keyrev++, key,
+	    sizeof(key));
+	config->ticket_autorekey = 1;
+	return (rv);
+}