/* $OpenBSD: tls_config.c,v 1.72 2026/03/10 05:26:04 deraadt 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 <string.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|O_CLOEXEC)) == -1) {
                tls_error_set(error, TLS_ERROR_UNKNOWN,
                    "failed to open %s file '%s'",
                    filetype, filename);
                goto err;
        }
        if (fstat(fd, &st) != 0) {
                tls_error_set(error, TLS_ERROR_UNKNOWN,
                    "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, TLS_ERROR_UNKNOWN,
                    "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, TLS_ERROR_UNKNOWN,
                    "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);

        pthread_mutex_destroy(&config->mutex);

        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;
}

int
tls_config_error_code(struct tls_config *config)
{
        return config->error.code;
}

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, TLS_ERROR_INVALID_ARGUMENT,
                    "alpn too large");
                goto err;
        }

        if ((buf = malloc(buf_len)) == NULL) {
                tls_config_set_errorx(config, TLS_ERROR_OUT_OF_MEMORY,
                    "out of memory");
                goto err;
        }

        if ((s = strdup(alpn)) == NULL) {
                tls_config_set_errorx(config, TLS_ERROR_OUT_OF_MEMORY,
                    "out of memory");
                goto err;
        }

        i = 0;
        q = s;
        while ((p = strsep(&q, ",")) != NULL) {
                if ((len = strlen(p)) == 0) {
                        tls_config_set_errorx(config, TLS_ERROR_INVALID_ARGUMENT,
                            "alpn protocol with zero length");
                        goto err;
                }
                if (len > 255) {
                        tls_config_set_errorx(config, TLS_ERROR_INVALID_ARGUMENT,
                            "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 (key_file != NULL &&
            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 (key != NULL &&
            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, TLS_ERROR_OUT_OF_MEMORY,
                    "out of memory");
                goto err;
        }
        if (SSL_CTX_set_cipher_list(ssl_ctx, ciphers) != 1) {
                tls_config_set_errorx(config, TLS_ERROR_UNKNOWN,
                    "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, TLS_ERROR_UNKNOWN,
                    "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, TLS_ERROR_UNKNOWN,
                    "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, TLS_ERROR_OUT_OF_MEMORY,
                    "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, TLS_ERROR_UNKNOWN,
                            "invalid ecdhe curve '%s'", p);
                        goto err;
                }

                if ((curves_new = reallocarray(curves_list, curves_num + 1,
                    sizeof(int))) == NULL) {
                        tls_config_set_errorx(config, TLS_ERROR_OUT_OF_MEMORY,
                            "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, TLS_ERROR_UNKNOWN,
                    "failed to stat session file");
                return (-1);
        }
        if (!S_ISREG(sb.st_mode)) {
                tls_config_set_errorx(config, TLS_ERROR_UNKNOWN,
                    "session file is not a regular file");
                return (-1);
        }

        if (sb.st_uid != getuid()) {
                tls_config_set_errorx(config, TLS_ERROR_UNKNOWN,
                    "session file has incorrect owner (uid %u != %u)",
                    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, TLS_ERROR_UNKNOWN,
                    "session file has incorrect permissions (%o != 600)", mugo);
                return (-1);
        }

        config->session_fd = session_fd;

        return (0);
}

int
tls_config_set_sign_cb(struct tls_config *config, tls_sign_cb cb, void *cb_arg)
{
        config->use_fake_private_key = 1;
        config->skip_private_key_check = 1;
        config->sign_cb = cb;
        config->sign_cb_arg = cb_arg;

        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;
}

void
tls_config_use_fake_private_key(struct tls_config *config)
{
        config->use_fake_private_key = 1;
        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, TLS_ERROR_INVALID_ARGUMENT,
                    "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, TLS_ERROR_INVALID_ARGUMENT,
                    "session lifetime too large");
                return (-1);
        }
        if (lifetime != 0 && lifetime < TLS_MIN_SESSION_TIMEOUT) {
                tls_config_set_errorx(config, TLS_ERROR_INVALID_ARGUMENT,
                    "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, TLS_ERROR_UNKNOWN,
                    "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, TLS_ERROR_UNKNOWN,
                    "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);
}