/* $OpenBSD: tls_config.c,v 1.53 2018/11/29 14:24:23 tedu 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 <stdlib.h>
#include <unistd.h>

#include <tls.h>

#include "tls_internal.h"

#ifdef __VMS
#include "../acme-client/vms.h"
#endif

#ifdef WCME_DEFAULT_CA_FILE
static const char default_ca_file[] = "/wcme_root/etc/cacert.pem";
#else
static const char default_ca_file[] = "/etc/ssl/cert.pem";
#endif

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;

#ifdef WCME_IDIOM
   UtilMereMortal ();
#endif
   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 ((config->keypair = tls_keypair_new()) == NULL)
      goto err;

   config->refcount = 1;
   config->session_fd = -1;

   /*
    * Default configuration.
    */
   if (tls_config_set_dheparams(config, "none") != 0)
      goto err;
#if WCME_OPENSSL_SINCE_110
   if (tls_config_set_ecdhecurves(config, "default") != 0)
      goto err;
#endif
#ifndef WCME_IDIOM
   if (tls_config_set_ciphers(config, "secure") != 0)
      goto err;
#else
   if (tls_config_set_ciphers(config, "compat") != 0)
      goto err;
#endif
   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:
#ifdef WCME_DBG_LIBTLS
   warn("tls_config_new() %d",__LINE__);
#endif
   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;

   if (config == NULL)
      return;

   if (--config->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;

      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 WCME_OPENSSL_SINCE_110
   if ((ssl_ctx = SSL_CTX_new(TLS_method())) == NULL) {
      tls_config_set_errorx(config, "out of memory");
      goto err;
   }
   if (!SSL_CTX_set_min_proto_version (ssl_ctx, TLS1_VERSION))
   {
      tls_config_set_errorx(config, "set_min_proto_version failure");
      goto err;
   }
   if (!SSL_CTX_set_max_proto_version (ssl_ctx, TLS_MAX_VERSION))
   {
      tls_config_set_errorx(config, "set_max_proto_version failure");
      goto err;
   }
#else
   if ((ssl_ctx = SSL_CTX_new(SSLv23_method())) == NULL) {
      tls_config_set_errorx(config, "out of memory");
      goto err;
   }
#endif
   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 (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);
}