blob: eb3c3a0eb54bc6697e385cc841d2b2284b6bcc4e [file] [log] [blame]
/*
* SSL data transfer functions between buffers and SOCK_STREAM sockets
*
* Copyright (C) 2012 EXCELIANCE, Emeric Brun <ebrun@exceliance.fr>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Acknowledgement:
* We'd like to specially thank the Stud project authors for a very clean
* and well documented code which helped us understand how the OpenSSL API
* ought to be used in non-blocking mode. This is one difficult part which
* is not easy to get from the OpenSSL doc, and reading the Stud code made
* it much more obvious than the examples in the OpenSSL package. Keep up
* the good works, guys !
*
* Stud is an extremely efficient and scalable SSL/TLS proxy which combines
* particularly well with haproxy. For more info about this project, visit :
* https://github.com/bumptech/stud
*
*/
#define _GNU_SOURCE
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <netinet/tcp.h>
#include <openssl/ssl.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/x509.h>
#include <openssl/err.h>
#include <common/buffer.h>
#include <common/compat.h>
#include <common/config.h>
#include <common/debug.h>
#include <common/standard.h>
#include <common/ticks.h>
#include <common/time.h>
#include <ebsttree.h>
#include <types/global.h>
#include <types/ssl_sock.h>
#include <proto/acl.h>
#include <proto/arg.h>
#include <proto/connection.h>
#include <proto/fd.h>
#include <proto/freq_ctr.h>
#include <proto/frontend.h>
#include <proto/log.h>
#include <proto/shctx.h>
#include <proto/ssl_sock.h>
#include <proto/task.h>
static int sslconns = 0;
void ssl_sock_infocbk(const SSL *ssl, int where, int ret)
{
struct connection *conn = (struct connection *)SSL_get_app_data(ssl);
(void)ret; /* shut gcc stupid warning */
if (where & SSL_CB_HANDSHAKE_START) {
/* Disable renegotiation (CVE-2009-3555) */
if (conn->flags & CO_FL_CONNECTED)
conn->flags |= CO_FL_ERROR;
}
}
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
/* Sets the SSL ctx of <ssl> to match the advertised server name. Returns a
* warning when no match is found, which implies the default (first) cert
* will keep being used.
*/
static int ssl_sock_switchctx_cbk(SSL *ssl, int *al, struct bind_conf *s)
{
const char *servername;
const char *wildp = NULL;
struct ebmb_node *node;
int i;
(void)al; /* shut gcc stupid warning */
servername = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name);
if (!servername)
return SSL_TLSEXT_ERR_NOACK;
for (i = 0; i < trashlen; i++) {
if (!servername[i])
break;
trash[i] = tolower(servername[i]);
if (!wildp && (trash[i] == '.'))
wildp = &trash[i];
}
trash[i] = 0;
/* lookup in full qualified names */
node = ebst_lookup(&s->sni_ctx, trash);
if (!node) {
if (!wildp)
return SSL_TLSEXT_ERR_ALERT_WARNING;
/* lookup in full wildcards names */
node = ebst_lookup(&s->sni_w_ctx, wildp);
if (!node)
return SSL_TLSEXT_ERR_ALERT_WARNING;
}
/* switch ctx */
SSL_set_SSL_CTX(ssl, container_of(node, struct sni_ctx, name)->ctx);
return SSL_TLSEXT_ERR_OK;
}
#endif /* SSL_CTRL_SET_TLSEXT_HOSTNAME */
/* Loads a certificate key and CA chain from a file. Returns 0 on error, -1 if
* an early error happens and the caller must call SSL_CTX_free() by itelf.
*/
int ssl_sock_load_cert_chain_file(SSL_CTX *ctx, const char *file, struct bind_conf *s)
{
BIO *in;
X509 *x = NULL, *ca;
int i, len, err;
int ret = -1;
int order = 0;
X509_NAME *xname;
char *str;
struct sni_ctx *sc;
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
STACK_OF(GENERAL_NAME) *names;
#endif
in = BIO_new(BIO_s_file());
if (in == NULL)
goto end;
if (BIO_read_filename(in, file) <= 0)
goto end;
x = PEM_read_bio_X509_AUX(in, NULL, ctx->default_passwd_callback, ctx->default_passwd_callback_userdata);
if (x == NULL)
goto end;
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
names = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
if (names) {
for (i = 0; i < sk_GENERAL_NAME_num(names); i++) {
GENERAL_NAME *name = sk_GENERAL_NAME_value(names, i);
if (name->type == GEN_DNS) {
if (ASN1_STRING_to_UTF8((unsigned char **)&str, name->d.dNSName) >= 0) {
if ((len = strlen(str))) {
int j;
if (*str != '*') {
sc = malloc(sizeof(struct sni_ctx) + len + 1);
for (j = 0; j < len; j++)
sc->name.key[j] = tolower(str[j]);
sc->name.key[len] = 0;
sc->order = order++;
sc->ctx = ctx;
ebst_insert(&s->sni_ctx, &sc->name);
}
else {
sc = malloc(sizeof(struct sni_ctx) + len);
for (j = 1; j < len; j++)
sc->name.key[j-1] = tolower(str[j]);
sc->name.key[len-1] = 0;
sc->order = order++;
sc->ctx = ctx;
ebst_insert(&s->sni_w_ctx, &sc->name);
}
}
OPENSSL_free(str);
}
}
}
sk_GENERAL_NAME_pop_free(names, GENERAL_NAME_free);
}
#endif /* SSL_CTRL_SET_TLSEXT_HOSTNAME */
xname = X509_get_subject_name(x);
i = -1;
while ((i = X509_NAME_get_index_by_NID(xname, NID_commonName, i)) != -1) {
X509_NAME_ENTRY *entry = X509_NAME_get_entry(xname, i);
if (ASN1_STRING_to_UTF8((unsigned char **)&str, entry->value) >= 0) {
if ((len = strlen(str))) {
int j;
if (*str != '*') {
sc = malloc(sizeof(struct sni_ctx) + len + 1);
for (j = 0; j < len; j++)
sc->name.key[j] = tolower(str[j]);
sc->name.key[len] = 0;
sc->order = order++;
sc->ctx = ctx;
ebst_insert(&s->sni_ctx, &sc->name);
}
else {
sc = malloc(sizeof(struct sni_ctx) + len);
for (j = 1; j < len; j++)
sc->name.key[j-1] = tolower(str[j]);
sc->name.key[len-1] = 0;
sc->order = order++;
sc->ctx = ctx;
ebst_insert(&s->sni_w_ctx, &sc->name);
}
}
OPENSSL_free(str);
}
}
ret = 0; /* the caller must not free the SSL_CTX argument anymore */
if (!SSL_CTX_use_certificate(ctx, x))
goto end;
if (ctx->extra_certs != NULL) {
sk_X509_pop_free(ctx->extra_certs, X509_free);
ctx->extra_certs = NULL;
}
while ((ca = PEM_read_bio_X509(in, NULL, ctx->default_passwd_callback, ctx->default_passwd_callback_userdata))) {
if (!SSL_CTX_add_extra_chain_cert(ctx, ca)) {
X509_free(ca);
goto end;
}
}
err = ERR_get_error();
if (!err || (ERR_GET_LIB(err) == ERR_LIB_PEM && ERR_GET_REASON(err) == PEM_R_NO_START_LINE)) {
/* we successfully reached the last cert in the file */
ret = 1;
}
ERR_clear_error();
end:
if (x)
X509_free(x);
if (in)
BIO_free(in);
return ret;
}
int ssl_sock_load_cert_file(const char *path, struct bind_conf *bind_conf, struct proxy *curproxy)
{
int ret;
SSL_CTX *ctx;
ctx = SSL_CTX_new(SSLv23_server_method());
if (!ctx) {
Alert("Proxy '%s': unable to allocate SSL context for bind '%s' at [%s:%d] using cert '%s'.\n",
curproxy->id, bind_conf->arg, bind_conf->file, bind_conf->line, path);
return 1;
}
if (SSL_CTX_use_PrivateKey_file(ctx, path, SSL_FILETYPE_PEM) <= 0) {
Alert("Proxy '%s': unable to load SSL private key from file '%s' in bind '%s' at [%s:%d].\n",
curproxy->id, path, bind_conf->arg, bind_conf->file, bind_conf->line);
SSL_CTX_free(ctx);
return 1;
}
ret = ssl_sock_load_cert_chain_file(ctx, path, bind_conf);
if (ret <= 0) {
Alert("Proxy '%s': unable to load SSL certificate from file '%s' in bind '%s' at [%s:%d].\n",
curproxy->id, path, bind_conf->arg, bind_conf->file, bind_conf->line);
if (ret < 0) /* serious error, must do that ourselves */
SSL_CTX_free(ctx);
return 1;
}
/* we must not free the SSL_CTX anymore below, since it's already in
* the tree, so it will be discovered and cleaned in time.
*/
#ifndef SSL_CTRL_SET_TLSEXT_HOSTNAME
if (bind_conf->default_ctx) {
Alert("Proxy '%s': file '%s' : this version of openssl cannot load multiple SSL certificates in bind '%s' at [%s:%d].\n",
curproxy->id, path, bind_conf->arg, bind_conf->file, bind_conf->line);
return 1;
}
#endif
if (!bind_conf->default_ctx)
bind_conf->default_ctx = ctx;
return 0;
}
int ssl_sock_load_cert(char *path, struct bind_conf *bind_conf, struct proxy *curproxy)
{
struct dirent *de;
DIR *dir;
struct stat buf;
int pathlen = 0;
char *end, *fp;
int cfgerr = 0;
if (!(dir = opendir(path)))
return ssl_sock_load_cert_file(path, bind_conf, curproxy);
/* strip trailing slashes, including first one */
for (end = path + strlen(path) - 1; end >= path && *end == '/'; end--)
*end = 0;
if (end >= path)
pathlen = end + 1 - path;
fp = malloc(pathlen + 1 + NAME_MAX + 1);
while ((de = readdir(dir))) {
snprintf(fp, pathlen + 1 + NAME_MAX + 1, "%s/%s", path, de->d_name);
if (stat(fp, &buf) != 0) {
Alert("Proxy '%s': unable to stat SSL certificate from file '%s' in bind '%s' at [%s:%d] : %s.\n",
curproxy->id, fp, bind_conf->arg, bind_conf->file, bind_conf->line, strerror(errno));
cfgerr++;
continue;
}
if (!S_ISREG(buf.st_mode))
continue;
cfgerr += ssl_sock_load_cert_file(fp, bind_conf, curproxy);
}
free(fp);
closedir(dir);
return cfgerr;
}
#ifndef SSL_OP_CIPHER_SERVER_PREFERENCE /* needs OpenSSL >= 0.9.7 */
#define SSL_OP_CIPHER_SERVER_PREFERENCE 0
#endif
#ifndef SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION /* needs OpenSSL >= 0.9.7 */
#define SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION 0
#endif
#ifndef SSL_OP_NO_COMPRESSION /* needs OpenSSL >= 0.9.9 */
#define SSL_OP_NO_COMPRESSION 0
#endif
#ifndef SSL_MODE_RELEASE_BUFFERS /* needs OpenSSL >= 1.0.0 */
#define SSL_MODE_RELEASE_BUFFERS 0
#endif
int ssl_sock_prepare_ctx(struct bind_conf *bind_conf, SSL_CTX *ctx, struct proxy *curproxy)
{
int cfgerr = 0;
int ssloptions =
SSL_OP_ALL | /* all known workarounds for bugs */
SSL_OP_NO_SSLv2 |
SSL_OP_NO_COMPRESSION |
SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION;
int sslmode =
SSL_MODE_ENABLE_PARTIAL_WRITE |
SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER |
SSL_MODE_RELEASE_BUFFERS;
if (bind_conf->nosslv3)
ssloptions |= SSL_OP_NO_SSLv3;
if (bind_conf->notlsv1)
ssloptions |= SSL_OP_NO_TLSv1;
if (bind_conf->prefer_server_ciphers)
ssloptions |= SSL_OP_CIPHER_SERVER_PREFERENCE;
SSL_CTX_set_options(ctx, ssloptions);
SSL_CTX_set_mode(ctx, sslmode);
SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL);
shared_context_set_cache(ctx);
if (bind_conf->ciphers &&
!SSL_CTX_set_cipher_list(ctx, bind_conf->ciphers)) {
Alert("Proxy '%s': unable to set SSL cipher list to '%s' for bind '%s' at [%s:%d].\n",
curproxy->id, bind_conf->ciphers, bind_conf->arg, bind_conf->file, bind_conf->line);
cfgerr++;
}
SSL_CTX_set_info_callback(ctx, ssl_sock_infocbk);
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
SSL_CTX_set_tlsext_servername_callback(ctx, ssl_sock_switchctx_cbk);
SSL_CTX_set_tlsext_servername_arg(ctx, bind_conf);
#endif
return cfgerr;
}
/* Walks down the two trees in bind_conf and prepares all certs. The pointer may
* be NULL, in which case nothing is done. Returns the number of errors
* encountered.
*/
int ssl_sock_prepare_all_ctx(struct bind_conf *bind_conf, struct proxy *px)
{
struct ebmb_node *node;
struct sni_ctx *sni;
int err = 0;
if (!bind_conf || !bind_conf->is_ssl)
return 0;
node = ebmb_first(&bind_conf->sni_ctx);
while (node) {
sni = ebmb_entry(node, struct sni_ctx, name);
if (!sni->order) /* only initialize the CTX on its first occurrence */
err += ssl_sock_prepare_ctx(bind_conf, sni->ctx, px);
node = ebmb_next(node);
}
node = ebmb_first(&bind_conf->sni_w_ctx);
while (node) {
sni = ebmb_entry(node, struct sni_ctx, name);
if (!sni->order) /* only initialize the CTX on its first occurrence */
err += ssl_sock_prepare_ctx(bind_conf, sni->ctx, px);
node = ebmb_next(node);
}
return err;
}
/* Walks down the two trees in bind_conf and frees all the certs. The pointer may
* be NULL, in which case nothing is done. The default_ctx is nullified too.
*/
void ssl_sock_free_all_ctx(struct bind_conf *bind_conf)
{
struct ebmb_node *node, *back;
struct sni_ctx *sni;
if (!bind_conf || !bind_conf->is_ssl)
return;
node = ebmb_first(&bind_conf->sni_ctx);
while (node) {
sni = ebmb_entry(node, struct sni_ctx, name);
back = ebmb_next(node);
ebmb_delete(node);
if (!sni->order) /* only free the CTX on its first occurrence */
SSL_CTX_free(sni->ctx);
free(sni);
node = back;
}
node = ebmb_first(&bind_conf->sni_w_ctx);
while (node) {
sni = ebmb_entry(node, struct sni_ctx, name);
back = ebmb_next(node);
ebmb_delete(node);
if (!sni->order) /* only free the CTX on its first occurrence */
SSL_CTX_free(sni->ctx);
free(sni);
node = back;
}
bind_conf->default_ctx = NULL;
}
/*
* This function is called if SSL * context is not yet allocated. The function
* is designed to be called before any other data-layer operation and sets the
* handshake flag on the connection. It is safe to call it multiple times.
* It returns 0 on success and -1 in error case.
*/
static int ssl_sock_init(struct connection *conn)
{
/* already initialized */
if (conn->data_ctx)
return 0;
if (global.maxsslconn && sslconns >= global.maxsslconn)
return -1;
/* If it is in client mode initiate SSL session
in connect state otherwise accept state */
if (target_srv(&conn->target)) {
/* Alloc a new SSL session ctx */
conn->data_ctx = SSL_new(target_srv(&conn->target)->ssl_ctx.ctx);
if (!conn->data_ctx)
return -1;
SSL_set_connect_state(conn->data_ctx);
if (target_srv(&conn->target)->ssl_ctx.reused_sess)
SSL_set_session(conn->data_ctx, target_srv(&conn->target)->ssl_ctx.reused_sess);
/* set fd on SSL session context */
SSL_set_fd(conn->data_ctx, conn->t.sock.fd);
/* leave init state and start handshake */
conn->flags |= CO_FL_SSL_WAIT_HS | CO_FL_WAIT_L6_CONN;
sslconns++;
return 0;
}
else if (target_client(&conn->target)) {
/* Alloc a new SSL session ctx */
conn->data_ctx = SSL_new(target_client(&conn->target)->bind_conf->default_ctx);
if (!conn->data_ctx)
return -1;
SSL_set_accept_state(conn->data_ctx);
/* set fd on SSL session context */
SSL_set_fd(conn->data_ctx, conn->t.sock.fd);
/* set connection pointer */
SSL_set_app_data(conn->data_ctx, conn);
/* leave init state and start handshake */
conn->flags |= CO_FL_SSL_WAIT_HS | CO_FL_WAIT_L6_CONN;
sslconns++;
return 0;
}
/* don't know how to handle such a target */
return -1;
}
/* This is the callback which is used when an SSL handshake is pending. It
* updates the FD status if it wants some polling before being called again.
* It returns 0 if it fails in a fatal way or needs to poll to go further,
* otherwise it returns non-zero and removes itself from the connection's
* flags (the bit is provided in <flag> by the caller).
*/
int ssl_sock_handshake(struct connection *conn, unsigned int flag)
{
int ret;
if (!conn->data_ctx)
goto out_error;
ret = SSL_do_handshake(conn->data_ctx);
if (ret != 1) {
/* handshake did not complete, let's find why */
ret = SSL_get_error(conn->data_ctx, ret);
if (ret == SSL_ERROR_WANT_WRITE) {
/* SSL handshake needs to write, L4 connection may not be ready */
__conn_sock_stop_recv(conn);
__conn_sock_poll_send(conn);
return 0;
}
else if (ret == SSL_ERROR_WANT_READ) {
/* SSL handshake needs to read, L4 connection is ready */
if (conn->flags & CO_FL_WAIT_L4_CONN)
conn->flags &= ~CO_FL_WAIT_L4_CONN;
__conn_sock_stop_send(conn);
__conn_sock_poll_recv(conn);
return 0;
}
else {
/* Fail on all other handshake errors */
goto out_error;
}
}
/* Handshake succeeded */
if (target_srv(&conn->target)) {
if (!SSL_session_reused(conn->data_ctx)) {
/* check if session was reused, if not store current session on server for reuse */
if (target_srv(&conn->target)->ssl_ctx.reused_sess)
SSL_SESSION_free(target_srv(&conn->target)->ssl_ctx.reused_sess);
target_srv(&conn->target)->ssl_ctx.reused_sess = SSL_get1_session(conn->data_ctx);
}
}
/* The connection is now established at both layers, it's time to leave */
conn->flags &= ~(flag | CO_FL_WAIT_L4_CONN | CO_FL_WAIT_L6_CONN);
return 1;
out_error:
/* Fail on all other handshake errors */
conn->flags |= CO_FL_ERROR;
conn->flags &= ~flag;
return 0;
}
/* Receive up to <count> bytes from connection <conn>'s socket and store them
* into buffer <buf>. The caller must ensure that <count> is always smaller
* than the buffer's size. Only one call to recv() is performed, unless the
* buffer wraps, in which case a second call may be performed. The connection's
* flags are updated with whatever special event is detected (error, read0,
* empty). The caller is responsible for taking care of those events and
* avoiding the call if inappropriate. The function does not call the
* connection's polling update function, so the caller is responsible for this.
*/
static int ssl_sock_to_buf(struct connection *conn, struct buffer *buf, int count)
{
int ret, done = 0;
int try = count;
if (!conn->data_ctx)
goto out_error;
if (conn->flags & CO_FL_HANDSHAKE)
/* a handshake was requested */
return 0;
/* compute the maximum block size we can read at once. */
if (buffer_empty(buf)) {
/* let's realign the buffer to optimize I/O */
buf->p = buf->data;
}
else if (buf->data + buf->o < buf->p &&
buf->p + buf->i < buf->data + buf->size) {
/* remaining space wraps at the end, with a moving limit */
if (try > buf->data + buf->size - (buf->p + buf->i))
try = buf->data + buf->size - (buf->p + buf->i);
}
/* read the largest possible block. For this, we perform only one call
* to recv() unless the buffer wraps and we exactly fill the first hunk,
* in which case we accept to do it once again. A new attempt is made on
* EINTR too.
*/
while (try) {
ret = SSL_read(conn->data_ctx, bi_end(buf), try);
if (conn->flags & CO_FL_ERROR) {
/* CO_FL_ERROR may be set by ssl_sock_infocbk */
break;
}
if (ret > 0) {
buf->i += ret;
done += ret;
if (ret < try)
break;
count -= ret;
try = count;
}
else if (ret == 0) {
goto read0;
}
else {
ret = SSL_get_error(conn->data_ctx, ret);
if (ret == SSL_ERROR_WANT_WRITE) {
/* handshake is running, and it needs to poll for a write event */
conn->flags |= CO_FL_SSL_WAIT_HS;
__conn_sock_poll_send(conn);
break;
}
else if (ret == SSL_ERROR_WANT_READ) {
/* we need to poll for retry a read later */
__conn_data_poll_recv(conn);
break;
}
/* otherwise it's a real error */
goto out_error;
}
}
return done;
read0:
conn_sock_read0(conn);
return done;
out_error:
conn->flags |= CO_FL_ERROR;
return done;
}
/* Send all pending bytes from buffer <buf> to connection <conn>'s socket.
* <flags> may contain MSG_MORE to make the system hold on without sending
* data too fast, but this flag is ignored at the moment.
* Only one call to send() is performed, unless the buffer wraps, in which case
* a second call may be performed. The connection's flags are updated with
* whatever special event is detected (error, empty). The caller is responsible
* for taking care of those events and avoiding the call if inappropriate. The
* function does not call the connection's polling update function, so the caller
* is responsible for this.
*/
static int ssl_sock_from_buf(struct connection *conn, struct buffer *buf, int flags)
{
int ret, try, done;
done = 0;
if (!conn->data_ctx)
goto out_error;
if (conn->flags & CO_FL_HANDSHAKE)
/* a handshake was requested */
return 0;
/* send the largest possible block. For this we perform only one call
* to send() unless the buffer wraps and we exactly fill the first hunk,
* in which case we accept to do it once again.
*/
while (buf->o) {
try = buf->o;
/* outgoing data may wrap at the end */
if (buf->data + try > buf->p)
try = buf->data + try - buf->p;
ret = SSL_write(conn->data_ctx, bo_ptr(buf), try);
if (conn->flags & CO_FL_ERROR) {
/* CO_FL_ERROR may be set by ssl_sock_infocbk */
break;
}
if (ret > 0) {
buf->o -= ret;
done += ret;
if (likely(!buffer_len(buf)))
/* optimize data alignment in the buffer */
buf->p = buf->data;
/* if the system buffer is full, don't insist */
if (ret < try)
break;
}
else {
ret = SSL_get_error(conn->data_ctx, ret);
if (ret == SSL_ERROR_WANT_WRITE) {
/* we need to poll to retry a write later */
__conn_data_poll_send(conn);
break;
}
else if (ret == SSL_ERROR_WANT_READ) {
/* handshake is running, and
it needs to poll for a read event,
write polling must be disabled cause
we are sure we can't write anything more
before handshake re-performed */
conn->flags |= CO_FL_SSL_WAIT_HS;
__conn_sock_poll_recv(conn);
break;
}
goto out_error;
}
}
return done;
out_error:
conn->flags |= CO_FL_ERROR;
return done;
}
static void ssl_sock_close(struct connection *conn) {
if (conn->data_ctx) {
SSL_free(conn->data_ctx);
conn->data_ctx = NULL;
sslconns--;
}
}
/* This function tries to perform a clean shutdown on an SSL connection, and in
* any case, flags the connection as reusable if no handshake was in progress.
*/
static void ssl_sock_shutw(struct connection *conn, int clean)
{
if (conn->flags & CO_FL_HANDSHAKE)
return;
/* no handshake was in progress, try a clean ssl shutdown */
if (clean)
SSL_shutdown(conn->data_ctx);
/* force flag on ssl to keep session in cache regardless shutdown result */
SSL_set_shutdown(conn->data_ctx, SSL_SENT_SHUTDOWN);
}
/***** Below are some sample fetching functions for ACL/patterns *****/
/* boolean, returns true if data layer is SSL */
static int
smp_fetch_is_ssl(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
smp->type = SMP_T_BOOL;
smp->data.uint = (l4->si[0].conn.data == &ssl_sock);
return 1;
}
/* boolean, returns true if data layer is SSL */
static int
smp_fetch_has_sni(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
smp->type = SMP_T_BOOL;
smp->data.uint = (l4->si[0].conn.data == &ssl_sock) &&
l4->si[0].conn.data_ctx &&
SSL_get_servername(l4->si[0].conn.data_ctx, TLSEXT_NAMETYPE_host_name) != NULL;
return 1;
#else
return 0;
#endif
}
static int
smp_fetch_ssl_sni(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
smp->flags = 0;
smp->type = SMP_T_CSTR;
if (!l4 || !l4->si[0].conn.data_ctx || l4->si[0].conn.data != &ssl_sock)
return 0;
smp->data.str.str = (char *)SSL_get_servername(l4->si[0].conn.data_ctx, TLSEXT_NAMETYPE_host_name);
if (!smp->data.str.str)
return 0;
smp->data.str.len = strlen(smp->data.str.str);
return 1;
#else
return 0;
#endif
}
/* Note: must not be declared <const> as its list will be overwritten.
* Please take care of keeping this list alphabetically sorted.
*/
static struct sample_fetch_kw_list sample_fetch_keywords = {{ },{
{ "is_ssl", smp_fetch_is_ssl, 0, NULL, SMP_T_BOOL, SMP_CAP_REQ|SMP_CAP_RES },
{ "ssl_has_sni", smp_fetch_has_sni, 0, NULL, SMP_T_BOOL, SMP_CAP_REQ|SMP_CAP_RES },
{ "ssl_sni", smp_fetch_ssl_sni, 0, NULL, SMP_T_CSTR, SMP_CAP_REQ|SMP_CAP_RES },
{ NULL, NULL, 0, 0, 0 },
}};
/* Note: must not be declared <const> as its list will be overwritten.
* Please take care of keeping this list alphabetically sorted.
*/
static struct acl_kw_list acl_kws = {{ },{
{ "is_ssl", acl_parse_int, smp_fetch_is_ssl, acl_match_nothing, ACL_USE_L6REQ_PERMANENT, 0 },
{ "ssl_has_sni", acl_parse_int, smp_fetch_has_sni, acl_match_nothing, ACL_USE_L6REQ_PERMANENT, 0 },
{ "ssl_sni", acl_parse_str, smp_fetch_ssl_sni, acl_match_str, ACL_USE_L6REQ_PERMANENT|ACL_MAY_LOOKUP, 0 },
{ "ssl_sni_end", acl_parse_str, smp_fetch_ssl_sni, acl_match_end, ACL_USE_L6REQ_PERMANENT|ACL_MAY_LOOKUP, 0 },
{ "ssl_sni_reg", acl_parse_str, smp_fetch_ssl_sni, acl_match_reg, ACL_USE_L6REQ_PERMANENT|ACL_MAY_LOOKUP, 0 },
{ NULL, NULL, NULL, NULL },
}};
/* data-layer operations for SSL sockets */
struct data_ops ssl_sock = {
.snd_buf = ssl_sock_from_buf,
.rcv_buf = ssl_sock_to_buf,
.rcv_pipe = NULL,
.snd_pipe = NULL,
.shutr = NULL,
.shutw = ssl_sock_shutw,
.close = ssl_sock_close,
.init = ssl_sock_init,
};
__attribute__((constructor))
static void __ssl_sock_init(void) {
STACK_OF(SSL_COMP)* cm;
SSL_library_init();
cm = SSL_COMP_get_compression_methods();
sk_SSL_COMP_zero(cm);
sample_register_fetches(&sample_fetch_keywords);
acl_register_keywords(&acl_kws);
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/