Merging upstream version 1.46.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 962 deletions

diff --git a/web/server/h2o/libh2o/src/ssl.c b/web/server/h2o/libh2o/src/ssl.c
deleted file mode 100644
index 7ac6c4c96..000000000
--- a/web/server/h2o/libh2o/src/ssl.c
+++ /dev/null
@@ -1,962 +0,0 @@
-/*
- * Copyright (c) 2015 DeNA Co., Ltd., Kazuho Oku
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- */
-#include <assert.h>
-#include <inttypes.h>
-#include <pthread.h>
-#include <sys/stat.h>
-#include <openssl/crypto.h>
-#include <openssl/err.h>
-#include <openssl/evp.h>
-#include <openssl/rand.h>
-#include <openssl/ssl.h>
-#include "yoml-parser.h"
-#include "yrmcds.h"
-#if H2O_USE_PICOTLS
-#include "picotls.h"
-#include "picotls/openssl.h"
-#endif
-#include "h2o/file.h"
-#include "h2o.h"
-#include "h2o/configurator.h"
-#include "standalone.h"
-
-struct st_session_ticket_generating_updater_conf_t {
-    const EVP_CIPHER *cipher;
-    const EVP_MD *md;
-};
-
-struct st_session_ticket_file_updater_conf_t {
-    const char *filename;
-};
-
-static struct {
-    struct {
-        void (*setup)(SSL_CTX **contexts, size_t num_contexts);
-        union {
-            struct {
-                size_t num_threads;
-                char *prefix;
-            } memcached;
-        } vars;
-    } cache;
-    struct {
-        void *(*update_thread)(void *conf);
-        union {
-            struct st_session_ticket_generating_updater_conf_t generating;
-            struct {
-                struct st_session_ticket_generating_updater_conf_t generating; /* at same address as conf.ticket.vars.generating */
-                h2o_iovec_t key;
-            } memcached;
-            struct st_session_ticket_file_updater_conf_t file;
-        } vars;
-    } ticket;
-    unsigned lifetime;
-    struct {
-        char *host;
-        uint16_t port;
-        int text_protocol;
-    } memcached;
-} conf;
-
-H2O_NORETURN static void *cache_cleanup_thread(void *_contexts)
-{
-    SSL_CTX **contexts = _contexts;
-
-    while (1) {
-        size_t i;
-        for (i = 0; contexts[i] != NULL; ++i)
-            SSL_CTX_flush_sessions(contexts[i], time(NULL));
-        sleep(conf.lifetime / 4);
-    }
-}
-
-static void spawn_cache_cleanup_thread(SSL_CTX **_contexts, size_t num_contexts)
-{
-    /* copy the list of contexts */
-    SSL_CTX **contexts = malloc(sizeof(*contexts) * (num_contexts + 1));
-    h2o_memcpy(contexts, _contexts, sizeof(*contexts) * num_contexts);
-    contexts[num_contexts] = NULL;
-
-    /* launch the thread */
-    pthread_t tid;
-    pthread_attr_t attr;
-    pthread_attr_init(&attr);
-    pthread_attr_setdetachstate(&attr, 1);
-    h2o_multithread_create_thread(&tid, &attr, cache_cleanup_thread, contexts);
-}
-
-static void setup_cache_disable(SSL_CTX **contexts, size_t num_contexts)
-{
-    size_t i;
-    for (i = 0; i != num_contexts; ++i)
-        SSL_CTX_set_session_cache_mode(contexts[i], SSL_SESS_CACHE_OFF);
-}
-
-static void setup_cache_internal(SSL_CTX **contexts, size_t num_contexts)
-{
-    size_t i;
-    for (i = 0; i != num_contexts; ++i) {
-        SSL_CTX_set_session_cache_mode(contexts[i], SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_AUTO_CLEAR);
-        SSL_CTX_set_timeout(contexts[i], conf.lifetime);
-    }
-    spawn_cache_cleanup_thread(contexts, num_contexts);
-}
-
-static void setup_cache_memcached(SSL_CTX **contexts, size_t num_contexts)
-{
-    h2o_memcached_context_t *memc_ctx =
-        h2o_memcached_create_context(conf.memcached.host, conf.memcached.port, conf.memcached.text_protocol,
-                                     conf.cache.vars.memcached.num_threads, conf.cache.vars.memcached.prefix);
-    h2o_accept_setup_async_ssl_resumption(memc_ctx, conf.lifetime);
-    size_t i;
-    for (i = 0; i != num_contexts; ++i) {
-        SSL_CTX_set_session_cache_mode(contexts[i], SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_AUTO_CLEAR);
-        SSL_CTX_set_timeout(contexts[i], conf.lifetime);
-        h2o_socket_ssl_async_resumption_setup_ctx(contexts[i]);
-    }
-    spawn_cache_cleanup_thread(contexts, num_contexts);
-}
-
-static void cache_init_defaults(void)
-{
-    conf.cache.setup = setup_cache_internal;
-}
-
-#if H2O_USE_SESSION_TICKETS
-
-struct st_session_ticket_t {
-    unsigned char name[16];
-    struct {
-        const EVP_CIPHER *cipher;
-        unsigned char *key;
-    } cipher;
-    struct {
-        const EVP_MD *md;
-        unsigned char *key;
-    } hmac;
-    uint64_t not_before;
-    uint64_t not_after;
-};
-
-typedef H2O_VECTOR(struct st_session_ticket_t *) session_ticket_vector_t;
-
-static struct {
-    pthread_rwlock_t rwlock;
-    session_ticket_vector_t tickets; /* sorted from newer to older */
-} session_tickets = {
-/* we need writer-preferred lock, but on linux PTHREAD_RWLOCK_INITIALIZER is reader-preferred */
-#ifdef PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP
-    PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP
-#else
-    PTHREAD_RWLOCK_INITIALIZER
-#endif
-    ,
-    {NULL} /* tickets */
-};
-
-static struct st_session_ticket_t *new_ticket(const EVP_CIPHER *cipher, const EVP_MD *md, uint64_t not_before, uint64_t not_after,
-                                              int fill_in)
-{
-    int key_len = EVP_CIPHER_key_length(cipher), block_size = EVP_MD_block_size(md);
-    struct st_session_ticket_t *ticket = h2o_mem_alloc(sizeof(*ticket) + key_len + block_size);
-
-    ticket->cipher.cipher = cipher;
-    ticket->cipher.key = (unsigned char *)ticket + sizeof(*ticket);
-    ticket->hmac.md = md;
-    ticket->hmac.key = ticket->cipher.key + key_len;
-    ticket->not_before = not_before;
-    ticket->not_after = not_after;
-    if (fill_in) {
-        RAND_bytes(ticket->name, sizeof(ticket->name));
-        RAND_bytes(ticket->cipher.key, key_len);
-        RAND_bytes(ticket->hmac.key, block_size);
-    }
-
-    return ticket;
-}
-
-static void free_ticket(struct st_session_ticket_t *ticket)
-{
-    int key_len = EVP_CIPHER_key_length(ticket->cipher.cipher), block_size = EVP_MD_block_size(ticket->hmac.md);
-    h2o_mem_set_secure(ticket, 0, sizeof(*ticket) + key_len + block_size);
-    free(ticket);
-}
-
-static int ticket_sort_compare(const void *_x, const void *_y)
-{
-    struct st_session_ticket_t *x = *(void **)_x, *y = *(void **)_y;
-
-    if (x->not_before != y->not_before)
-        return x->not_before > y->not_before ? -1 : 1;
-    return memcmp(x->name, y->name, sizeof(x->name));
-}
-
-static void free_tickets(session_ticket_vector_t *tickets)
-{
-    size_t i;
-    for (i = 0; i != tickets->size; ++i)
-        free_ticket(tickets->entries[i]);
-    free(tickets->entries);
-    memset(tickets, 0, sizeof(*tickets));
-}
-
-static struct st_session_ticket_t *find_ticket_for_encryption(session_ticket_vector_t *tickets, uint64_t now)
-{
-    size_t i;
-
-    for (i = 0; i != tickets->size; ++i) {
-        struct st_session_ticket_t *ticket = tickets->entries[i];
-        if (ticket->not_before <= now) {
-            if (now <= ticket->not_after) {
-                return ticket;
-            } else {
-                return NULL;
-            }
-        }
-    }
-    return NULL;
-}
-
-static int ticket_key_callback(unsigned char *key_name, unsigned char *iv, EVP_CIPHER_CTX *ctx, HMAC_CTX *hctx, int enc)
-{
-    int ret;
-    pthread_rwlock_rdlock(&session_tickets.rwlock);
-
-    if (enc) {
-        RAND_bytes(iv, EVP_MAX_IV_LENGTH);
-        struct st_session_ticket_t *ticket = find_ticket_for_encryption(&session_tickets.tickets, time(NULL)), *temp_ticket = NULL;
-        if (ticket != NULL) {
-        } else {
-            /* create a dummy ticket and use (this is the only way to continue the handshake; contrary to the man pages, OpenSSL
-             * crashes if we return zero */
-            ticket = temp_ticket = new_ticket(EVP_aes_256_cbc(), EVP_sha256(), 0, UINT64_MAX, 1);
-        }
-        memcpy(key_name, ticket->name, sizeof(ticket->name));
-        EVP_EncryptInit_ex(ctx, ticket->cipher.cipher, NULL, ticket->cipher.key, iv);
-        HMAC_Init_ex(hctx, ticket->hmac.key, EVP_MD_block_size(ticket->hmac.md), ticket->hmac.md, NULL);
-        if (temp_ticket != NULL)
-            free_ticket(ticket);
-        ret = 1;
-    } else {
-        struct st_session_ticket_t *ticket;
-        size_t i;
-        for (i = 0; i != session_tickets.tickets.size; ++i) {
-            ticket = session_tickets.tickets.entries[i];
-            if (memcmp(ticket->name, key_name, sizeof(ticket->name)) == 0)
-                goto Found;
-        }
-        /* not found */
-        ret = 0;
-        goto Exit;
-    Found:
-        EVP_DecryptInit_ex(ctx, ticket->cipher.cipher, NULL, ticket->cipher.key, iv);
-        HMAC_Init_ex(hctx, ticket->hmac.key, EVP_MD_block_size(ticket->hmac.md), ticket->hmac.md, NULL);
-        /* Request renewal if the youngest key is active */
-        if (i != 0 && session_tickets.tickets.entries[i - 1]->not_before <= time(NULL))
-            ret = 2;
-        else
-            ret = 1;
-    }
-
-Exit:
-    pthread_rwlock_unlock(&session_tickets.rwlock);
-    return ret;
-}
-
-static int ticket_key_callback_ossl(SSL *ssl, unsigned char *key_name, unsigned char *iv, EVP_CIPHER_CTX *ctx, HMAC_CTX *hctx,
-                                    int enc)
-{
-    return ticket_key_callback(key_name, iv, ctx, hctx, enc);
-}
-
-#if H2O_USE_PICOTLS
-
-static int encrypt_ticket_key_ptls(ptls_encrypt_ticket_t *self, ptls_t *tls, int is_encrypt, ptls_buffer_t *dst, ptls_iovec_t src)
-{
-    return (is_encrypt ? ptls_openssl_encrypt_ticket : ptls_openssl_decrypt_ticket)(dst, src, ticket_key_callback);
-}
-
-#endif
-
-static int update_tickets(session_ticket_vector_t *tickets, uint64_t now)
-{
-    int altered = 0, has_valid_ticket;
-
-    /* remove old entries */
-    while (tickets->size != 0) {
-        struct st_session_ticket_t *oldest = tickets->entries[tickets->size - 1];
-        if (now <= oldest->not_after)
-            break;
-        tickets->entries[--tickets->size] = NULL;
-        free_ticket(oldest);
-        altered = 1;
-    }
-
-    /* create new entry if necessary */
-    has_valid_ticket = find_ticket_for_encryption(tickets, now) != NULL;
-    if (!has_valid_ticket || (tickets->entries[0]->not_before + conf.lifetime / 4 < now)) {
-        uint64_t not_before = has_valid_ticket ? now + 60 : now;
-        struct st_session_ticket_t *ticket = new_ticket(conf.ticket.vars.generating.cipher, conf.ticket.vars.generating.md,
-                                                        not_before, not_before + conf.lifetime - 1, 1);
-        h2o_vector_reserve(NULL, tickets, tickets->size + 1);
-        memmove(tickets->entries + 1, tickets->entries, sizeof(tickets->entries[0]) * tickets->size);
-        ++tickets->size;
-        tickets->entries[0] = ticket;
-        altered = 1;
-    }
-
-    return altered;
-}
-
-H2O_NORETURN static void *ticket_internal_updater(void *unused)
-{
-    while (1) {
-        pthread_rwlock_wrlock(&session_tickets.rwlock);
-        update_tickets(&session_tickets.tickets, time(NULL));
-        pthread_rwlock_unlock(&session_tickets.rwlock);
-        /* sleep for certain amount of time */
-        sleep(120 - (h2o_rand() >> 16) % 7);
-    }
-}
-
-static int serialize_ticket_entry(char *buf, size_t bufsz, struct st_session_ticket_t *ticket)
-{
-    char *name_buf = alloca(sizeof(ticket->name) * 2 + 1);
-    h2o_hex_encode(name_buf, ticket->name, sizeof(ticket->name));
-    int key_len = EVP_CIPHER_key_length(ticket->cipher.cipher), block_size = EVP_MD_block_size(ticket->hmac.md);
-    char *key_buf = alloca((key_len + block_size) * 2 + 1);
-    h2o_hex_encode(key_buf, ticket->cipher.key, key_len);
-    h2o_hex_encode(key_buf + key_len * 2, ticket->hmac.key, block_size);
-
-    return snprintf(buf, bufsz, "- name: %s\n"
-                                "  cipher: %s\n"
-                                "  hash: %s\n"
-                                "  key: %s\n"
-                                "  not_before: %" PRIu64 "\n"
-                                "  not_after: %" PRIu64 "\n",
-                    name_buf, OBJ_nid2sn(EVP_CIPHER_type(ticket->cipher.cipher)), OBJ_nid2sn(EVP_MD_type(ticket->hmac.md)), key_buf,
-                    ticket->not_before, ticket->not_after);
-}
-
-static struct st_session_ticket_t *parse_ticket_entry(yoml_t *element, char *errstr)
-{
-    yoml_t *t;
-    struct st_session_ticket_t *ticket;
-    unsigned char name[sizeof(ticket->name) + 1], *key;
-    const EVP_CIPHER *cipher;
-    const EVP_MD *hash;
-    uint64_t not_before, not_after;
-
-    errstr[0] = '\0';
-
-    if (element->type != YOML_TYPE_MAPPING) {
-        strcpy(errstr, "node is not a mapping");
-        return NULL;
-    }
-
-#define FETCH(n, post)                                                                                                             \
-    do {                                                                                                                           \
-        if ((t = yoml_get(element, n)) == NULL) {                                                                                  \
-            strcpy(errstr, " mandatory attribute `" n "` is missing");                                                             \
-            return NULL;                                                                                                           \
-        }                                                                                                                          \
-        if (t->type != YOML_TYPE_SCALAR) {                                                                                         \
-            strcpy(errstr, "attribute `" n "` is not a string");                                                                   \
-            return NULL;                                                                                                           \
-        }                                                                                                                          \
-        post                                                                                                                       \
-    } while (0)
-
-    FETCH("name", {
-        if (strlen(t->data.scalar) != sizeof(ticket->name) * 2) {
-            strcpy(errstr, "length of `name` attribute is not 32 bytes");
-            return NULL;
-        }
-        if (h2o_hex_decode(name, t->data.scalar, sizeof(ticket->name) * 2) != 0) {
-            strcpy(errstr, "failed to decode the hex-encoded name");
-            return NULL;
-        }
-    });
-    FETCH("cipher", {
-        if ((cipher = EVP_get_cipherbyname(t->data.scalar)) == NULL) {
-            strcpy(errstr, "cannot find the named cipher algorithm");
-            return NULL;
-        }
-    });
-    FETCH("hash", {
-        if ((hash = EVP_get_digestbyname(t->data.scalar)) == NULL) {
-            strcpy(errstr, "cannot find the named hash algorgithm");
-            return NULL;
-        }
-    });
-    FETCH("key", {
-        size_t keylen = EVP_CIPHER_key_length(cipher) + EVP_MD_block_size(hash);
-        if (strlen(t->data.scalar) != keylen * 2) {
-            sprintf(errstr, "length of the `key` attribute is incorrect (is %zu, must be %zu)\n", strlen(t->data.scalar),
-                    keylen * 2);
-            return NULL;
-        }
-        key = alloca(keylen + 1);
-        if (h2o_hex_decode(key, t->data.scalar, keylen * 2) != 0) {
-            strcpy(errstr, "failed to decode the hex-encoded key");
-            return NULL;
-        }
-    });
-    FETCH("not_before", {
-        if (sscanf(t->data.scalar, "%" SCNu64, &not_before) != 1) {
-            strcpy(errstr, "failed to parse the `not_before` attribute");
-            return NULL;
-        }
-    });
-    FETCH("not_after", {
-        if (sscanf(t->data.scalar, "%" SCNu64, &not_after) != 1) {
-            strcpy(errstr, "failed to parse the `not_after` attribute");
-            return NULL;
-        }
-    });
-    if (!(not_before <= not_after)) {
-        strcpy(errstr, "`not_after` is not equal to or greater than `not_before`");
-        return NULL;
-    }
-
-#undef FETCH
-
-    ticket = new_ticket(cipher, hash, not_before, not_after, 0);
-    memcpy(ticket->name, name, sizeof(ticket->name));
-    memcpy(ticket->cipher.key, key, EVP_CIPHER_key_length(cipher));
-    memcpy(ticket->hmac.key, key + EVP_CIPHER_key_length(cipher), EVP_MD_block_size(hash));
-    return ticket;
-}
-
-static int parse_tickets(session_ticket_vector_t *tickets, const void *src, size_t len, char *errstr)
-{
-    yaml_parser_t parser;
-    yoml_t *doc;
-    size_t i;
-
-    *tickets = (session_ticket_vector_t){NULL};
-    yaml_parser_initialize(&parser);
-
-    yaml_parser_set_input_string(&parser, src, len);
-    yoml_parse_args_t parse_args = {NULL, h2o_mem_set_secure};
-    if ((doc = yoml_parse_document(&parser, NULL, &parse_args)) == NULL) {
-        sprintf(errstr, "parse error at line %d:%s\n", (int)parser.problem_mark.line, parser.problem);
-        goto Error;
-    }
-    if (doc->type != YOML_TYPE_SEQUENCE) {
-        strcpy(errstr, "root element is not a sequence");
-        goto Error;
-    }
-    for (i = 0; i != doc->data.sequence.size; ++i) {
-        char errbuf[256];
-        struct st_session_ticket_t *ticket = parse_ticket_entry(doc->data.sequence.elements[i], errbuf);
-        if (ticket == NULL) {
-            sprintf(errstr, "at element index %zu:%s\n", i, errbuf);
-            goto Error;
-        }
-        h2o_vector_reserve(NULL, tickets, tickets->size + 1);
-        tickets->entries[tickets->size++] = ticket;
-    }
-
-    yoml_free(doc, h2o_mem_set_secure);
-    yaml_parser_delete(&parser);
-    return 0;
-Error:
-    if (doc != NULL)
-        yoml_free(doc, h2o_mem_set_secure);
-    yaml_parser_delete(&parser);
-    free_tickets(tickets);
-    return -1;
-}
-
-static h2o_iovec_t serialize_tickets(session_ticket_vector_t *tickets)
-{
-    h2o_iovec_t data = {h2o_mem_alloc(tickets->size * 1024 + 1), 0};
-    size_t i;
-
-    for (i = 0; i != tickets->size; ++i) {
-        struct st_session_ticket_t *ticket = tickets->entries[i];
-        size_t l = serialize_ticket_entry(data.base + data.len, 1024, ticket);
-        if (l > 1024) {
-            fprintf(stderr, "[src/ssl.c] %s:internal buffer overflow\n", __func__);
-            goto Error;
-        }
-        data.len += l;
-    }
-
-    return data;
-Error:
-    free(data.base);
-    return (h2o_iovec_t){NULL};
-}
-
-static int ticket_memcached_update_tickets(yrmcds *conn, h2o_iovec_t key, time_t now)
-{
-    yrmcds_response resp;
-    yrmcds_error err;
-    uint32_t serial;
-    session_ticket_vector_t tickets = {NULL};
-    h2o_iovec_t tickets_serialized = {NULL};
-    int retry = 0;
-    char errbuf[256];
-
-    /* retrieve tickets on memcached */
-    if ((err = yrmcds_get(conn, key.base, key.len, 0, &serial)) != 0) {
-        fprintf(stderr, "[lib/ssl.c] %s:yrmcds_get failed:%s\n", __func__, yrmcds_strerror(err));
-        goto Exit;
-    }
-    if ((err = yrmcds_recv(conn, &resp)) != 0) {
-        fprintf(stderr, "[lib/ssl.c] %s:yrmcds_recv failed:%s\n", __func__, yrmcds_strerror(err));
-        goto Exit;
-    }
-    if (resp.serial != serial) {
-        fprintf(stderr, "[lib/ssl.c] %s:unexpected response\n", __func__);
-        goto Exit;
-    }
-    if (resp.status == YRMCDS_STATUS_OK) {
-        int r = parse_tickets(&tickets, resp.data, resp.data_len, errbuf);
-        h2o_mem_set_secure((void *)resp.data, 0, resp.data_len);
-        if (r != 0) {
-            fprintf(stderr, "[lib/ssl.c] %s:failed to parse response:%s\n", __func__, errbuf);
-            goto Exit;
-        }
-    }
-    if (tickets.size > 1)
-        qsort(tickets.entries, tickets.size, sizeof(tickets.entries[0]), ticket_sort_compare);
-
-    /* if we need to update the tickets, atomically update the value in memcached, and request refetch to the caller */
-    if (update_tickets(&tickets, now) != 0) {
-        tickets_serialized = serialize_tickets(&tickets);
-        if (resp.status == YRMCDS_STATUS_NOTFOUND) {
-            if ((err = yrmcds_add(conn, key.base, key.len, tickets_serialized.base, tickets_serialized.len, 0, conf.lifetime, 0, 0,
-                                  &serial)) != 0) {
-                fprintf(stderr, "[lib/ssl.c] %s:yrmcds_add failed:%s\n", __func__, yrmcds_strerror(err));
-                goto Exit;
-            }
-        } else {
-            if ((err = yrmcds_set(conn, key.base, key.len, tickets_serialized.base, tickets_serialized.len, 0, conf.lifetime,
-                                  resp.cas_unique, 0, &serial)) != 0) {
-                fprintf(stderr, "[lib/ssl.c] %s:yrmcds_set failed:%s\n", __func__, yrmcds_strerror(err));
-                goto Exit;
-            }
-        }
-        if ((err = yrmcds_recv(conn, &resp)) != 0) {
-            fprintf(stderr, "[lib/ssl.c] %s:yrmcds_recv failed:%s\n", __func__, yrmcds_strerror(err));
-            goto Exit;
-        }
-        retry = 1;
-        goto Exit;
-    }
-
-    /* store the results */
-    pthread_rwlock_wrlock(&session_tickets.rwlock);
-    h2o_mem_swap(&session_tickets.tickets, &tickets, sizeof(tickets));
-    pthread_rwlock_unlock(&session_tickets.rwlock);
-
-Exit:
-    free(tickets_serialized.base);
-    free_tickets(&tickets);
-    return retry;
-}
-
-H2O_NORETURN static void *ticket_memcached_updater(void *unused)
-{
-    while (1) {
-        /* connect */
-        yrmcds conn;
-        yrmcds_error err;
-        size_t failcnt;
-        for (failcnt = 0; (err = yrmcds_connect(&conn, conf.memcached.host, conf.memcached.port)) != YRMCDS_OK; ++failcnt) {
-            if (failcnt == 0)
-                fprintf(stderr, "[src/ssl.c] failed to connect to memcached at %s:%" PRIu16 ", %s\n", conf.memcached.host,
-                        conf.memcached.port, yrmcds_strerror(err));
-            sleep(10);
-        }
-        if (conf.memcached.text_protocol)
-            yrmcds_text_mode(&conn);
-        /* connected */
-        while (ticket_memcached_update_tickets(&conn, conf.ticket.vars.memcached.key, time(NULL)))
-            ;
-        /* disconnect */
-        yrmcds_close(&conn);
-        sleep(60);
-    }
-}
-
-static int load_tickets_file(const char *fn)
-{
-#define ERR_PREFIX "failed to load session ticket secrets from file:%s:"
-
-    h2o_iovec_t data = {NULL};
-    session_ticket_vector_t tickets = {NULL};
-    char errbuf[256];
-    int ret = -1;
-
-    /* load yaml */
-    data = h2o_file_read(fn);
-    if (data.base == NULL) {
-        char errbuf[256];
-        strerror_r(errno, errbuf, sizeof(errbuf));
-        fprintf(stderr, ERR_PREFIX "%s\n", fn, errbuf);
-        goto Exit;
-    }
-    /* parse the data */
-    if (parse_tickets(&tickets, data.base, data.len, errbuf) != 0) {
-        fprintf(stderr, ERR_PREFIX "%s\n", fn, errbuf);
-        goto Exit;
-    }
-    /* sort the ticket entries being read */
-    if (tickets.size > 1)
-        qsort(tickets.entries, tickets.size, sizeof(tickets.entries[0]), ticket_sort_compare);
-    /* replace the ticket list */
-    pthread_rwlock_wrlock(&session_tickets.rwlock);
-    h2o_mem_swap(&session_tickets.tickets, &tickets, sizeof(tickets));
-    pthread_rwlock_unlock(&session_tickets.rwlock);
-
-    ret = 0;
-Exit:
-    free(data.base);
-    free_tickets(&tickets);
-    return ret;
-
-#undef ERR_PREFIX
-}
-
-H2O_NORETURN static void *ticket_file_updater(void *unused)
-{
-    time_t last_mtime = 1; /* file is loaded if mtime changes, 0 is used to indicate that the file was missing */
-
-    while (1) {
-        struct stat st;
-        if (stat(conf.ticket.vars.file.filename, &st) != 0) {
-            if (last_mtime != 0) {
-                char errbuf[256];
-                strerror_r(errno, errbuf, sizeof(errbuf));
-                fprintf(stderr, "cannot load session ticket secrets from file:%s:%s\n", conf.ticket.vars.file.filename, errbuf);
-            }
-            last_mtime = 0;
-        } else if (last_mtime != st.st_mtime) {
-            /* (re)load */
-            last_mtime = st.st_mtime;
-            if (load_tickets_file(conf.ticket.vars.file.filename) == 0)
-                fprintf(stderr, "session ticket secrets have been (re)loaded\n");
-        }
-        sleep(10);
-    }
-}
-
-static void ticket_init_defaults(void)
-{
-    conf.ticket.update_thread = ticket_internal_updater;
-    /* to protect the secret >>>2030 we need AES-256 (http://www.keylength.com/en/4/) */
-    conf.ticket.vars.generating.cipher = EVP_aes_256_cbc();
-    /* integrity checks are only necessary at the time of handshake, and sha256 (recommended by RFC 5077) is sufficient */
-    conf.ticket.vars.generating.md = EVP_sha256();
-}
-
-#endif
-
-int ssl_session_resumption_on_config(h2o_configurator_command_t *cmd, h2o_configurator_context_t *ctx, yoml_t *node)
-{
-    enum {
-        MODE_CACHE = 1,
-        MODE_TICKET = 2,
-    };
-    int modes = -1, uses_memcached;
-    yoml_t *t;
-
-    if ((t = yoml_get(node, "mode")) == NULL) {
-        h2o_configurator_errprintf(cmd, node, "mandatory attribute `mode` is missing");
-        return -1;
-    }
-    if (t->type == YOML_TYPE_SCALAR) {
-        if (strcasecmp(t->data.scalar, "off") == 0) {
-            modes = 0;
-        } else if (strcasecmp(t->data.scalar, "all") == 0) {
-            modes = MODE_CACHE;
-#if H2O_USE_SESSION_TICKETS
-            modes |= MODE_TICKET;
-#endif
-        } else if (strcasecmp(t->data.scalar, "cache") == 0) {
-            modes = MODE_CACHE;
-        } else if (strcasecmp(t->data.scalar, "ticket") == 0) {
-            modes = MODE_TICKET;
-        }
-    }
-    if (modes == -1) {
-        h2o_configurator_errprintf(cmd, t, "value of `mode` must be one of: off | all | cache | ticket");
-        return -1;
-    }
-
-    if ((modes & MODE_CACHE) != 0) {
-        cache_init_defaults();
-        if ((t = yoml_get(node, "cache-store")) != NULL) {
-            if (t->type == YOML_TYPE_SCALAR) {
-                if (strcasecmp(t->data.scalar, "internal") == 0) {
-                    /* preserve the default */
-                    t = NULL;
-                } else if (strcasecmp(t->data.scalar, "memcached") == 0) {
-                    conf.cache.setup = setup_cache_memcached;
-                    t = NULL;
-                }
-            }
-            if (t != NULL) {
-                h2o_configurator_errprintf(cmd, t, "value of `cache-store` must be one of: internal | memcached");
-                return -1;
-            }
-        }
-        if (conf.cache.setup == setup_cache_memcached) {
-            conf.cache.vars.memcached.num_threads = 1;
-            conf.cache.vars.memcached.prefix = "h2o:ssl-session-cache:";
-            if ((t = yoml_get(node, "cache-memcached-num-threads")) != NULL) {
-                if (!(t->type == YOML_TYPE_SCALAR && sscanf(t->data.scalar, "%zu", &conf.cache.vars.memcached.num_threads) == 1 &&
-                      conf.cache.vars.memcached.num_threads != 0)) {
-                    h2o_configurator_errprintf(cmd, t, "`cache-memcached-num-threads` must be a positive number");
-                    return -1;
-                }
-            }
-            if ((t = yoml_get(node, "cache-memcached-prefix")) != NULL) {
-                if (t->type != YOML_TYPE_SCALAR) {
-                    h2o_configurator_errprintf(cmd, t, "`cache-memcached-prefix` must be a string");
-                    return -1;
-                }
-                conf.cache.vars.memcached.prefix = h2o_strdup(NULL, t->data.scalar, SIZE_MAX).base;
-            }
-        }
-    } else {
-        conf.cache.setup = setup_cache_disable;
-    }
-
-    if ((modes & MODE_TICKET) != 0) {
-#if H2O_USE_SESSION_TICKETS
-        ticket_init_defaults();
-        if ((t = yoml_get(node, "ticket-store")) != NULL) {
-            if (t->type == YOML_TYPE_SCALAR) {
-                if (strcasecmp(t->data.scalar, "internal") == 0) {
-                    /* ok, preserve the defaults */
-                    t = NULL;
-                } else if (strcasecmp(t->data.scalar, "file") == 0) {
-                    conf.ticket.update_thread = ticket_file_updater;
-                    t = NULL;
-                } else if (strcasecmp(t->data.scalar, "memcached") == 0) {
-                    conf.ticket.update_thread = ticket_memcached_updater;
-                    t = NULL;
-                }
-            }
-            if (t != NULL) {
-                h2o_configurator_errprintf(cmd, t, "value of `ticket-store` must be one of: internal | file");
-                return -1;
-            }
-        }
-        if (conf.ticket.update_thread == ticket_internal_updater || conf.ticket.update_thread == ticket_memcached_updater) {
-            /* generating updater takes two arguments: cipher, hash */
-            if ((t = yoml_get(node, "ticket-cipher")) != NULL) {
-                if (t->type != YOML_TYPE_SCALAR ||
-                    (conf.ticket.vars.generating.cipher = EVP_get_cipherbyname(t->data.scalar)) == NULL) {
-                    h2o_configurator_errprintf(cmd, t, "unknown cipher algorithm");
-                    return -1;
-                }
-            }
-            if ((t = yoml_get(node, "ticket-hash")) != NULL) {
-                if (t->type != YOML_TYPE_SCALAR ||
-                    (conf.ticket.vars.generating.md = EVP_get_digestbyname(t->data.scalar)) == NULL) {
-                    h2o_configurator_errprintf(cmd, t, "unknown hash algorithm");
-                    return -1;
-                }
-            }
-            if (conf.ticket.update_thread == ticket_memcached_updater) {
-                conf.ticket.vars.memcached.key = h2o_iovec_init(H2O_STRLIT("h2o:ssl-session-key"));
-                if ((t = yoml_get(node, "ticket-memcached-prefix")) != NULL) {
-                    if (t->type != YOML_TYPE_SCALAR) {
-                        h2o_configurator_errprintf(cmd, t, "`ticket-memcached-key` must be a string");
-                        return -1;
-                    }
-                    conf.ticket.vars.memcached.key = h2o_strdup(NULL, t->data.scalar, SIZE_MAX);
-                }
-            }
-        } else if (conf.ticket.update_thread == ticket_file_updater) {
-            /* file updater reads the contents of the file and uses it as the session ticket secret */
-            if ((t = yoml_get(node, "ticket-file")) == NULL) {
-                h2o_configurator_errprintf(cmd, node, "mandatory attribute `file` is missing");
-                return -1;
-            }
-            if (t->type != YOML_TYPE_SCALAR) {
-                h2o_configurator_errprintf(cmd, node, "`file` must be a string");
-                return -1;
-            }
-            conf.ticket.vars.file.filename = h2o_strdup(NULL, t->data.scalar, SIZE_MAX).base;
-        }
-#else
-        h2o_configurator_errprintf(
-            cmd, mode, "ticket-based session resumption cannot be used, the server is built without support for the feature");
-        return -1;
-#endif
-    } else {
-        conf.ticket.update_thread = NULL;
-    }
-
-    if ((t = yoml_get(node, "memcached")) != NULL) {
-        conf.memcached.host = NULL;
-        conf.memcached.port = 11211;
-        conf.memcached.text_protocol = 0;
-        size_t index;
-        for (index = 0; index != t->data.mapping.size; ++index) {
-            yoml_t *key = t->data.mapping.elements[index].key;
-            yoml_t *value = t->data.mapping.elements[index].value;
-            if (value == t)
-                continue;
-            if (key->type != YOML_TYPE_SCALAR) {
-                h2o_configurator_errprintf(cmd, key, "attribute must be a string");
-                return -1;
-            }
-            if (strcmp(key->data.scalar, "host") == 0) {
-                if (value->type != YOML_TYPE_SCALAR) {
-                    h2o_configurator_errprintf(cmd, value, "`host` must be a string");
-                    return -1;
-                }
-                conf.memcached.host = h2o_strdup(NULL, value->data.scalar, SIZE_MAX).base;
-            } else if (strcmp(key->data.scalar, "port") == 0) {
-                if (!(value->type == YOML_TYPE_SCALAR && sscanf(value->data.scalar, "%" SCNu16, &conf.memcached.port) == 1)) {
-                    h2o_configurator_errprintf(cmd, value, "`port` must be a number");
-                    return -1;
-                }
-            } else if (strcmp(key->data.scalar, "protocol") == 0) {
-                ssize_t sel = h2o_configurator_get_one_of(cmd, value, "BINARY,ASCII");
-                if (sel == -1)
-                    return -1;
-                conf.memcached.text_protocol = (int)sel;
-            } else {
-                h2o_configurator_errprintf(cmd, key, "unknown attribute: %s", key->data.scalar);
-                return -1;
-            }
-        }
-        if (conf.memcached.host == NULL) {
-            h2o_configurator_errprintf(cmd, t, "mandatory attribute `host` is missing");
-            return -1;
-        }
-    }
-
-    uses_memcached = conf.cache.setup == setup_cache_memcached;
-#if H2O_USE_SESSION_TICKETS
-    uses_memcached = (uses_memcached || conf.ticket.update_thread == ticket_memcached_updater);
-#endif
-    if (uses_memcached && conf.memcached.host == NULL) {
-        h2o_configurator_errprintf(cmd, node, "configuration of memcached is missing");
-        return -1;
-    }
-
-    if ((t = yoml_get(node, "lifetime")) != NULL) {
-        if (!(t->type == YOML_TYPE_SCALAR && sscanf(t->data.scalar, "%u", &conf.lifetime) == 1 && conf.lifetime != 0)) {
-            h2o_configurator_errprintf(cmd, t, "value of `lifetime` must be a positive number");
-            return -1;
-        }
-    }
-
-    return 0;
-}
-
-void ssl_setup_session_resumption(SSL_CTX **contexts, size_t num_contexts)
-{
-    if (conf.cache.setup != NULL)
-        conf.cache.setup(contexts, num_contexts);
-
-#if H2O_USE_SESSION_TICKETS
-    if (num_contexts == 0)
-        return;
-
-    if (conf.ticket.update_thread != NULL) {
-        /* start session ticket updater thread */
-        pthread_t tid;
-        pthread_attr_t attr;
-        pthread_attr_init(&attr);
-        pthread_attr_setdetachstate(&attr, 1);
-        h2o_multithread_create_thread(&tid, &attr, conf.ticket.update_thread, NULL);
-        size_t i;
-        for (i = 0; i != num_contexts; ++i) {
-            SSL_CTX *ctx = contexts[i];
-            SSL_CTX_set_tlsext_ticket_key_cb(ctx, ticket_key_callback_ossl);
-#if H2O_USE_PICOTLS
-            ptls_context_t *pctx = h2o_socket_ssl_get_picotls_context(ctx);
-            if (pctx != NULL) {
-                static ptls_encrypt_ticket_t encryptor = {encrypt_ticket_key_ptls};
-                pctx->ticket_lifetime = 86400 * 7; // FIXME conf.lifetime;
-                pctx->encrypt_ticket = &encryptor;
-            }
-#endif
-        }
-    } else {
-        size_t i;
-        for (i = 0; i != num_contexts; ++i)
-            SSL_CTX_set_options(contexts[i], SSL_CTX_get_options(contexts[i]) | SSL_OP_NO_TICKET);
-    }
-#endif
-}
-
-static pthread_mutex_t *mutexes;
-
-static void lock_callback(int mode, int n, const char *file, int line)
-{
-    if ((mode & CRYPTO_LOCK) != 0) {
-        pthread_mutex_lock(mutexes + n);
-    } else if ((mode & CRYPTO_UNLOCK) != 0) {
-        pthread_mutex_unlock(mutexes + n);
-    } else {
-        assert(!"unexpected mode");
-    }
-}
-
-static unsigned long thread_id_callback(void)
-{
-    return (unsigned long)pthread_self();
-}
-
-static int add_lock_callback(int *num, int amount, int type, const char *file, int line)
-{
-    (void)type;
-    (void)file;
-    (void)line;
-
-    return __sync_add_and_fetch(num, amount);
-}
-
-void init_openssl(void)
-{
-    int nlocks = CRYPTO_num_locks(), i;
-    mutexes = h2o_mem_alloc(sizeof(*mutexes) * nlocks);
-    for (i = 0; i != nlocks; ++i)
-        pthread_mutex_init(mutexes + i, NULL);
-    CRYPTO_set_locking_callback(lock_callback);
-    CRYPTO_set_id_callback(thread_id_callback);
-    CRYPTO_set_add_lock_callback(add_lock_callback);
-
-    /* Dynamic locks are only used by the CHIL engine at this time */
-
-    SSL_load_error_strings();
-    SSL_library_init();
-    OpenSSL_add_all_algorithms();
-
-    cache_init_defaults();
-#if H2O_USE_SESSION_TICKETS
-    ticket_init_defaults();
-#endif
-    conf.lifetime = 3600; /* default value for session timeout is 1 hour */
-}