src/ssl_sock.c

/*
 * SSL/TLS transport layer over 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 <openssl/rand.h>
#ifdef SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB
#include <openssl/ocsp.h>
#endif

#include <common/buffer.h>
#include <common/compat.h>
#include <common/config.h>
#include <common/debug.h>
#include <common/errors.h>
#include <common/standard.h>
#include <common/ticks.h>
#include <common/time.h>
#include <common/cfgparse.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/listener.h>
#include <proto/pattern.h>
#include <proto/server.h>
#include <proto/log.h>
#include <proto/proxy.h>
#include <proto/shctx.h>
#include <proto/ssl_sock.h>
#include <proto/task.h>

/* Warning, these are bits, not integers! */
#define SSL_SOCK_ST_FL_VERIFY_DONE  0x00000001
#define SSL_SOCK_ST_FL_16K_WBFSIZE  0x00000002
#define SSL_SOCK_SEND_UNLIMITED     0x00000004
#define SSL_SOCK_RECV_HEARTBEAT     0x00000008

/* bits 0xFFFF0000 are reserved to store verify errors */

/* Verify errors macros */
#define SSL_SOCK_CA_ERROR_TO_ST(e) (((e > 63) ? 63 : e) << (16))
#define SSL_SOCK_CAEDEPTH_TO_ST(d) (((d > 15) ? 15 : d) << (6+16))
#define SSL_SOCK_CRTERROR_TO_ST(e) (((e > 63) ? 63 : e) << (4+6+16))

#define SSL_SOCK_ST_TO_CA_ERROR(s) ((s >> (16)) & 63)
#define SSL_SOCK_ST_TO_CAEDEPTH(s) ((s >> (6+16)) & 15)
#define SSL_SOCK_ST_TO_CRTERROR(s) ((s >> (4+6+16)) & 63)

/* server and bind verify method, it uses a global value as default */
enum {
	SSL_SOCK_VERIFY_DEFAULT  = 0,
	SSL_SOCK_VERIFY_REQUIRED = 1,
	SSL_SOCK_VERIFY_OPTIONAL = 2,
	SSL_SOCK_VERIFY_NONE     = 3,
};

int sslconns = 0;
int totalsslconns = 0;

#ifndef OPENSSL_NO_DH
static DH *local_dh_1024 = NULL;
static DH *local_dh_2048 = NULL;
static DH *local_dh_4096 = NULL;
static DH *local_dh_8192 = NULL;
#endif /* OPENSSL_NO_DH */

#ifdef SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB
struct certificate_ocsp {
	struct ebmb_node key;
	unsigned char key_data[OCSP_MAX_CERTID_ASN1_LENGTH];
	struct chunk response;
	long expire;
};

/*
 *  This function returns the number of seconds  elapsed
 *  since the Epoch, 1970-01-01 00:00:00 +0000 (UTC) and the
 *  date presented un ASN1_GENERALIZEDTIME.
 *
 *  In parsing error case, it returns -1.
 */
static long asn1_generalizedtime_to_epoch(ASN1_GENERALIZEDTIME *d)
{
	long epoch;
	char *p, *end;
	const unsigned short month_offset[12] = {
		0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
	};
	int year, month;

	if (!d || (d->type != V_ASN1_GENERALIZEDTIME)) return -1;

	p = (char *)d->data;
	end = p + d->length;

	if (end - p < 4) return -1;
	year = 1000 * (p[0] - '0') + 100 * (p[1] - '0') + 10 * (p[2] - '0') + p[3] - '0';
	p += 4;
	if (end - p < 2) return -1;
	month = 10 * (p[0] - '0') + p[1] - '0';
	if (month < 1 || month > 12) return -1;
	/* Compute the number of seconds since 1 jan 1970 and the beginning of current month
	   We consider leap years and the current month (<marsh or not) */
	epoch = (  ((year - 1970) * 365)
		 + ((year - (month < 3)) / 4 - (year - (month < 3)) / 100 + (year - (month < 3)) / 400)
		 - ((1970 - 1) / 4 - (1970 - 1) / 100 + (1970 - 1) / 400)
		 + month_offset[month-1]
		) * 24 * 60 * 60;
	p += 2;
	if (end - p < 2) return -1;
	/* Add the number of seconds of completed days of current month */
	epoch += (10 * (p[0] - '0') + p[1] - '0' - 1) * 24 * 60 * 60;
	p += 2;
	if (end - p < 2) return -1;
	/* Add the completed hours of the current day */
	epoch += (10 * (p[0] - '0') + p[1] - '0') * 60 * 60;
	p += 2;
	if (end - p < 2) return -1;
	/* Add the completed minutes of the current hour */
	epoch += (10 * (p[0] - '0') + p[1] - '0') * 60;
	p += 2;
	if (p == end) return -1;
	/* Test if there is available seconds */
	if (p[0] < '0' || p[0] > '9')
		goto nosec;
	if (end - p < 2) return -1;
	/* Add the seconds of the current minute */
	epoch += 10 * (p[0] - '0') + p[1] - '0';
	p += 2;
	if (p == end) return -1;
	/* Ignore seconds float part if present */
	if (p[0] == '.') {
		do {
			if (++p == end) return -1;
		} while (p[0] >= '0' && p[0] <= '9');
	}

nosec:
	if (p[0] == 'Z') {
		if (end - p != 1) return -1;
		return epoch;
	}
	else if (p[0] == '+') {
		if (end - p != 5) return -1;
		/* Apply timezone offset */
		return epoch - ((10 * (p[1] - '0') + p[2] - '0') * 60 + (10 * (p[3] - '0') + p[4] - '0')) * 60;
	}
	else if (p[0] == '-') {
		if (end - p != 5) return -1;
		/* Apply timezone offset */
		return epoch + ((10 * (p[1] - '0') + p[2] - '0') * 60 + (10 * (p[3] - '0') + p[4] - '0')) * 60;
	}

	return -1;
}

static struct eb_root cert_ocsp_tree = EB_ROOT_UNIQUE;

/* This function starts to check if the OCSP response (in DER format) contained
 * in chunk 'ocsp_response' is valid (else exits on error).
 * If 'cid' is not NULL, it will be compared to the OCSP certificate ID
 * contained in the OCSP Response and exits on error if no match.
 * If it's a valid OCSP Response:
 *  If 'ocsp' is not NULL, the chunk is copied in the OCSP response's container
 * pointed by 'ocsp'.
 *  If 'ocsp' is NULL, the function looks up into the OCSP response's
 * containers tree (using as index the ASN1 form of the OCSP Certificate ID extracted
 * from the response) and exits on error if not found. Finally, If an OCSP response is
 * already present in the container, it will be overwritten.
 *
 * Note: OCSP response containing more than one OCSP Single response is not
 * considered valid.
 *
 * Returns 0 on success, 1 in error case.
 */
static int ssl_sock_load_ocsp_response(struct chunk *ocsp_response, struct certificate_ocsp *ocsp, OCSP_CERTID *cid, char **err)
{
	OCSP_RESPONSE *resp;
	OCSP_BASICRESP *bs = NULL;
	OCSP_SINGLERESP *sr;
	unsigned char *p = (unsigned char *)ocsp_response->str;
	int rc , count_sr;
	ASN1_GENERALIZEDTIME *revtime, *thisupd, *nextupd = NULL;
	int reason;
	int ret = 1;

	resp = d2i_OCSP_RESPONSE(NULL, (const unsigned char **)&p, ocsp_response->len);
	if (!resp) {
		memprintf(err, "Unable to parse OCSP response");
		goto out;
	}

	rc = OCSP_response_status(resp);
	if (rc != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
		memprintf(err, "OCSP response status not successful");
		goto out;
	}

	bs = OCSP_response_get1_basic(resp);
	if (!bs) {
		memprintf(err, "Failed to get basic response from OCSP Response");
		goto out;
	}

	count_sr = OCSP_resp_count(bs);
	if (count_sr > 1) {
		memprintf(err, "OCSP response ignored because contains multiple single responses (%d)", count_sr);
		goto out;
	}

	sr = OCSP_resp_get0(bs, 0);
	if (!sr) {
		memprintf(err, "Failed to get OCSP single response");
		goto out;
	}

	rc = OCSP_single_get0_status(sr, &reason, &revtime, &thisupd, &nextupd);
	if (rc != V_OCSP_CERTSTATUS_GOOD) {
		memprintf(err, "OCSP single response: certificate status not good");
		goto out;
	}

	if (!nextupd) {
		memprintf(err, "OCSP single response: missing nextupdate");
		goto out;
	}

	rc = OCSP_check_validity(thisupd, nextupd, OCSP_MAX_RESPONSE_TIME_SKEW, -1);
	if (!rc) {
		memprintf(err, "OCSP single response: no longer valid.");
		goto out;
	}

	if (cid) {
		if (OCSP_id_cmp(sr->certId, cid)) {
			memprintf(err, "OCSP single response: Certificate ID does not match certificate and issuer");
			goto out;
		}
	}

	if (!ocsp) {
		unsigned char key[OCSP_MAX_CERTID_ASN1_LENGTH];
		unsigned char *p;

		rc = i2d_OCSP_CERTID(sr->certId, NULL);
		if (!rc) {
			memprintf(err, "OCSP single response: Unable to encode Certificate ID");
			goto out;
		}

		if (rc > OCSP_MAX_CERTID_ASN1_LENGTH) {
			memprintf(err, "OCSP single response: Certificate ID too long");
			goto out;
		}

		p = key;
		memset(key, 0, OCSP_MAX_CERTID_ASN1_LENGTH);
		i2d_OCSP_CERTID(sr->certId, &p);
		ocsp = (struct certificate_ocsp *)ebmb_lookup(&cert_ocsp_tree, key, OCSP_MAX_CERTID_ASN1_LENGTH);
		if (!ocsp) {
			memprintf(err, "OCSP single response: Certificate ID does not match any certificate or issuer");
			goto out;
		}
	}

	/* According to comments on "chunk_dup", the
	   previous chunk buffer will be freed */
	if (!chunk_dup(&ocsp->response, ocsp_response)) {
		memprintf(err, "OCSP response: Memory allocation error");
		goto out;
	}

	ocsp->expire = asn1_generalizedtime_to_epoch(nextupd) - OCSP_MAX_RESPONSE_TIME_SKEW;

	ret = 0;
out:
	if (bs)
		 OCSP_BASICRESP_free(bs);

	if (resp)
		OCSP_RESPONSE_free(resp);

	return ret;
}
/*
 * External function use to update the OCSP response in the OCSP response's
 * containers tree. The chunk 'ocsp_response' must contain the OCSP response
 * to update in DER format.
 *
 * Returns 0 on success, 1 in error case.
 */
int ssl_sock_update_ocsp_response(struct chunk *ocsp_response, char **err)
{
	return ssl_sock_load_ocsp_response(ocsp_response, NULL, NULL, err);
}

/*
 * This function load the OCSP Resonse in DER format contained in file at
 * path 'ocsp_path' and call 'ssl_sock_load_ocsp_response'
 *
 * Returns 0 on success, 1 in error case.
 */
static int ssl_sock_load_ocsp_response_from_file(const char *ocsp_path, struct certificate_ocsp *ocsp, OCSP_CERTID *cid, char **err)
{
	int fd = -1;
	int r = 0;
	int ret = 1;

	fd = open(ocsp_path, O_RDONLY);
	if (fd == -1) {
		memprintf(err, "Error opening OCSP response file");
		goto end;
	}

	trash.len = 0;
	while (trash.len < trash.size) {
		r = read(fd, trash.str + trash.len, trash.size - trash.len);
		if (r < 0) {
			if (errno == EINTR)
				continue;

			memprintf(err, "Error reading OCSP response from file");
			goto end;
		}
		else if (r == 0) {
			break;
		}
		trash.len += r;
	}

	close(fd);
	fd = -1;

	ret = ssl_sock_load_ocsp_response(&trash, ocsp, cid, err);
end:
	if (fd != -1)
		close(fd);

	return ret;
}

/*
 * Callback used to set OCSP status extension content in server hello.
 */
int ssl_sock_ocsp_stapling_cbk(SSL *ssl, void *arg)
{
	struct certificate_ocsp *ocsp = (struct certificate_ocsp *)arg;
	char* ssl_buf;

	if (!ocsp ||
	    !ocsp->response.str ||
	    !ocsp->response.len ||
	    (ocsp->expire < now.tv_sec))
		return SSL_TLSEXT_ERR_NOACK;

	ssl_buf = OPENSSL_malloc(ocsp->response.len);
	if (!ssl_buf)
		return SSL_TLSEXT_ERR_NOACK;

	memcpy(ssl_buf, ocsp->response.str, ocsp->response.len);
	SSL_set_tlsext_status_ocsp_resp(ssl, ssl_buf, ocsp->response.len);

	return SSL_TLSEXT_ERR_OK;
}

/*
 * This function enables the handling of OCSP status extension on 'ctx' if a
 * file name 'cert_path' suffixed using ".ocsp" is present.
 * To enable OCSP status extension, the issuer's certificate is mandatory.
 * It should be present in the certificate's extra chain builded from file
 * 'cert_path'. If not found, the issuer certificate is loaded from a file
 * named 'cert_path' suffixed using '.issuer'.
 *
 * In addition, ".ocsp" file content is loaded as a DER format of an OCSP
 * response. If file is empty or content is not a valid OCSP response,
 * OCSP status extension is enabled but OCSP response is ignored (a warning
 * is displayed).
 *
 * Returns 1 if no ".ocsp" file found, 0 if OCSP status extension is
 * succesfully enabled, or -1 in other error case.
 */
static int ssl_sock_load_ocsp(SSL_CTX *ctx, const char *cert_path)
{

	BIO *in = NULL;
	X509 *x, *xi = NULL, *issuer = NULL;
	STACK_OF(X509) *chain = NULL;
	OCSP_CERTID *cid = NULL;
	SSL *ssl;
	char ocsp_path[MAXPATHLEN+1];
	int i, ret = -1;
	struct stat st;
	struct certificate_ocsp *ocsp = NULL, *iocsp;
	char *warn = NULL;
	unsigned char *p;

	snprintf(ocsp_path, MAXPATHLEN+1, "%s.ocsp", cert_path);

	if (stat(ocsp_path, &st))
		return 1;

	ssl = SSL_new(ctx);
	if (!ssl)
		goto out;

	x = SSL_get_certificate(ssl);
	if (!x)
		goto out;

	/* Try to lookup for issuer in certificate extra chain */
#ifdef SSL_CTRL_GET_EXTRA_CHAIN_CERTS
	SSL_CTX_get_extra_chain_certs(ctx, &chain);
#else
	chain = ctx->extra_certs;
#endif
	for (i = 0; i < sk_X509_num(chain); i++) {
		issuer = sk_X509_value(chain, i);
		if (X509_check_issued(issuer, x) == X509_V_OK)
			break;
		else
			issuer = NULL;
	}

	/* If not found try to load issuer from a suffixed file */
	if (!issuer) {
		char issuer_path[MAXPATHLEN+1];

		in = BIO_new(BIO_s_file());
		if (!in)
			goto out;

		snprintf(issuer_path, MAXPATHLEN+1, "%s.issuer", cert_path);
		if (BIO_read_filename(in, issuer_path) <= 0)
			goto out;

		xi = PEM_read_bio_X509_AUX(in, NULL, ctx->default_passwd_callback, ctx->default_passwd_callback_userdata);
		if (!xi)
			goto out;

		if (X509_check_issued(xi, x) != X509_V_OK)
			goto out;

		issuer = xi;
	}

	cid = OCSP_cert_to_id(0, x, issuer);
	if (!cid)
		goto out;

	i = i2d_OCSP_CERTID(cid, NULL);
	if (!i || (i > OCSP_MAX_CERTID_ASN1_LENGTH))
		goto out;

	ocsp = calloc(1, sizeof(struct certificate_ocsp));
	if (!ocsp)
		goto out;

	p = ocsp->key_data;
	i2d_OCSP_CERTID(cid, &p);

	iocsp = (struct certificate_ocsp *)ebmb_insert(&cert_ocsp_tree, &ocsp->key, OCSP_MAX_CERTID_ASN1_LENGTH);
	if (iocsp == ocsp)
		ocsp = NULL;

	SSL_CTX_set_tlsext_status_cb(ctx, ssl_sock_ocsp_stapling_cbk);
	SSL_CTX_set_tlsext_status_arg(ctx, iocsp);

	ret = 0;

	warn = NULL;
	if (ssl_sock_load_ocsp_response_from_file(ocsp_path, iocsp, cid, &warn)) {
		memprintf(&warn, "Loading '%s': %s. Content will be ignored", ocsp_path, warn ? warn : "failure");
		Warning("%s.\n", warn);
	}

out:
	if (ssl)
		SSL_free(ssl);

	if (in)
		BIO_free(in);

	if (xi)
		X509_free(xi);

	if (cid)
		OCSP_CERTID_free(cid);

	if (ocsp)
		free(ocsp);

	if (warn)
		free(warn);


	return ret;
}

#endif

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 */
	BIO *write_bio;

	if (where & SSL_CB_HANDSHAKE_START) {
		/* Disable renegotiation (CVE-2009-3555) */
		if (conn->flags & CO_FL_CONNECTED) {
			conn->flags |= CO_FL_ERROR;
			conn->err_code = CO_ER_SSL_RENEG;
		}
	}

	if ((where & SSL_CB_ACCEPT_LOOP) == SSL_CB_ACCEPT_LOOP) {
		if (!(conn->xprt_st & SSL_SOCK_ST_FL_16K_WBFSIZE)) {
			/* Long certificate chains optimz
			   If write and read bios are differents, we
			   consider that the buffering was activated,
                           so we rise the output buffer size from 4k
			   to 16k */
			write_bio = SSL_get_wbio(ssl);
			if (write_bio != SSL_get_rbio(ssl)) {
				BIO_set_write_buffer_size(write_bio, 16384);
				conn->xprt_st |= SSL_SOCK_ST_FL_16K_WBFSIZE;
			}
		}
	}
}

/* Callback is called for each certificate of the chain during a verify
   ok is set to 1 if preverify detect no error on current certificate.
   Returns 0 to break the handshake, 1 otherwise. */
int ssl_sock_bind_verifycbk(int ok, X509_STORE_CTX *x_store)
{
	SSL *ssl;
	struct connection *conn;
	int err, depth;

	ssl = X509_STORE_CTX_get_ex_data(x_store, SSL_get_ex_data_X509_STORE_CTX_idx());
	conn = (struct connection *)SSL_get_app_data(ssl);

	conn->xprt_st |= SSL_SOCK_ST_FL_VERIFY_DONE;

	if (ok) /* no errors */
		return ok;

	depth = X509_STORE_CTX_get_error_depth(x_store);
	err = X509_STORE_CTX_get_error(x_store);

	/* check if CA error needs to be ignored */
	if (depth > 0) {
		if (!SSL_SOCK_ST_TO_CA_ERROR(conn->xprt_st)) {
			conn->xprt_st |= SSL_SOCK_CA_ERROR_TO_ST(err);
			conn->xprt_st |= SSL_SOCK_CAEDEPTH_TO_ST(depth);
		}

		if (objt_listener(conn->target)->bind_conf->ca_ignerr & (1ULL << err)) {
			ERR_clear_error();
			return 1;
		}

		conn->err_code = CO_ER_SSL_CA_FAIL;
		return 0;
	}

	if (!SSL_SOCK_ST_TO_CRTERROR(conn->xprt_st))
		conn->xprt_st |= SSL_SOCK_CRTERROR_TO_ST(err);

	/* check if certificate error needs to be ignored */
	if (objt_listener(conn->target)->bind_conf->crt_ignerr & (1ULL << err)) {
		ERR_clear_error();
		return 1;
	}

	conn->err_code = CO_ER_SSL_CRT_FAIL;
	return 0;
}

/* Callback is called for ssl protocol analyse */
void ssl_sock_msgcbk(int write_p, int version, int content_type, const void *buf, size_t len, SSL *ssl, void *arg)
{
#ifdef TLS1_RT_HEARTBEAT
	/* test heartbeat received (write_p is set to 0
	   for a received record) */
	if ((content_type == TLS1_RT_HEARTBEAT) && (write_p == 0)) {
		struct connection *conn = (struct connection *)SSL_get_app_data(ssl);
		const unsigned char *p = buf;
		unsigned int payload;

		conn->xprt_st |= SSL_SOCK_RECV_HEARTBEAT;

		/* Check if this is a CVE-2014-0160 exploitation attempt. */
		if (*p != TLS1_HB_REQUEST)
			return;

		if (len < 1 + 2 + 16) /* 1 type + 2 size + 0 payload + 16 padding */
			goto kill_it;

		payload = (p[1] * 256) + p[2];
		if (3 + payload + 16 <= len)
			return; /* OK no problem */
	kill_it:
		/* We have a clear heartbleed attack (CVE-2014-0160), the
		 * advertised payload is larger than the advertised packet
		 * length, so we have garbage in the buffer between the
		 * payload and the end of the buffer (p+len). We can't know
		 * if the SSL stack is patched, and we don't know if we can
		 * safely wipe out the area between p+3+len and payload.
		 * So instead, we prevent the response from being sent by
		 * setting the max_send_fragment to 0 and we report an SSL
		 * error, which will kill this connection. It will be reported
		 * above as SSL_ERROR_SSL while an other handshake failure with
		 * a heartbeat message will be reported as SSL_ERROR_SYSCALL.
		 */
		ssl->max_send_fragment = 0;
		SSLerr(SSL_F_TLS1_HEARTBEAT, SSL_R_SSL_HANDSHAKE_FAILURE);
		return;
	}
#endif
}

#ifdef OPENSSL_NPN_NEGOTIATED
/* This callback is used so that the server advertises the list of
 * negociable protocols for NPN.
 */
static int ssl_sock_advertise_npn_protos(SSL *s, const unsigned char **data,
                                         unsigned int *len, void *arg)
{
	struct bind_conf *conf = arg;

	*data = (const unsigned char *)conf->npn_str;
	*len = conf->npn_len;
	return SSL_TLSEXT_ERR_OK;
}
#endif

#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
/* This callback is used so that the server advertises the list of
 * negociable protocols for ALPN.
 */
static int ssl_sock_advertise_alpn_protos(SSL *s, const unsigned char **out,
                                          unsigned char *outlen,
                                          const unsigned char *server,
                                          unsigned int server_len, void *arg)
{
	struct bind_conf *conf = arg;

	if (SSL_select_next_proto((unsigned char**) out, outlen, (const unsigned char *)conf->alpn_str,
	                          conf->alpn_len, server, server_len) != OPENSSL_NPN_NEGOTIATED) {
		return SSL_TLSEXT_ERR_NOACK;
	}
	return SSL_TLSEXT_ERR_OK;
}
#endif

#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, *n;
	int i;
	(void)al; /* shut gcc stupid warning */

	servername = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name);
	if (!servername) {
		return (s->strict_sni ?
			SSL_TLSEXT_ERR_ALERT_FATAL :
			SSL_TLSEXT_ERR_NOACK);
	}

	for (i = 0; i < trash.size; i++) {
		if (!servername[i])
			break;
		trash.str[i] = tolower(servername[i]);
		if (!wildp && (trash.str[i] == '.'))
			wildp = &trash.str[i];
	}
	trash.str[i] = 0;

	/* lookup in full qualified names */
	node = ebst_lookup(&s->sni_ctx, trash.str);

	/* lookup a not neg filter */
	for (n = node; n; n = ebmb_next_dup(n)) {
		if (!container_of(n, struct sni_ctx, name)->neg) {
			node = n;
			break;
		}
	}
	if (!node && wildp) {
		/* lookup in wildcards names */
		node = ebst_lookup(&s->sni_w_ctx, wildp);
	}
	if (!node || container_of(node, struct sni_ctx, name)->neg) {
		return (s->strict_sni ?
			SSL_TLSEXT_ERR_ALERT_FATAL :
			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 */

#ifndef OPENSSL_NO_DH

static DH * ssl_get_dh_1024(void)
{
#if OPENSSL_VERSION_NUMBER < 0x0090801fL
	static const unsigned char rfc_2409_prime_1024[] = {
		0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xC9,0x0F,0xDA,0xA2,
		0x21,0x68,0xC2,0x34,0xC4,0xC6,0x62,0x8B,0x80,0xDC,0x1C,0xD1,
		0x29,0x02,0x4E,0x08,0x8A,0x67,0xCC,0x74,0x02,0x0B,0xBE,0xA6,
		0x3B,0x13,0x9B,0x22,0x51,0x4A,0x08,0x79,0x8E,0x34,0x04,0xDD,
		0xEF,0x95,0x19,0xB3,0xCD,0x3A,0x43,0x1B,0x30,0x2B,0x0A,0x6D,
		0xF2,0x5F,0x14,0x37,0x4F,0xE1,0x35,0x6D,0x6D,0x51,0xC2,0x45,
		0xE4,0x85,0xB5,0x76,0x62,0x5E,0x7E,0xC6,0xF4,0x4C,0x42,0xE9,
		0xA6,0x37,0xED,0x6B,0x0B,0xFF,0x5C,0xB6,0xF4,0x06,0xB7,0xED,
		0xEE,0x38,0x6B,0xFB,0x5A,0x89,0x9F,0xA5,0xAE,0x9F,0x24,0x11,
		0x7C,0x4B,0x1F,0xE6,0x49,0x28,0x66,0x51,0xEC,0xE6,0x53,0x81,
		0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
	};
#endif
	DH *dh = DH_new();
	if (dh) {
#if OPENSSL_VERSION_NUMBER >= 0x0090801fL
		dh->p = get_rfc2409_prime_1024(NULL);
#else
		dh->p = BN_bin2bn(rfc_2409_prime_1024, sizeof rfc_2409_prime_1024, NULL);
#endif
		/* See RFC 2409, Section 6 "Oakley Groups"
		   for the reason why 2 is used as generator.
		*/
		BN_dec2bn(&dh->g, "2");
		if (!dh->p || !dh->g) {
			DH_free(dh);
			dh = NULL;
		}
	}
	return dh;
}

static DH *ssl_get_dh_2048(void)
{
#if OPENSSL_VERSION_NUMBER < 0x0090801fL
	static const unsigned char rfc_3526_prime_2048[] = {
		0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xC9,0x0F,0xDA,0xA2,
		0x21,0x68,0xC2,0x34,0xC4,0xC6,0x62,0x8B,0x80,0xDC,0x1C,0xD1,
		0x29,0x02,0x4E,0x08,0x8A,0x67,0xCC,0x74,0x02,0x0B,0xBE,0xA6,
		0x3B,0x13,0x9B,0x22,0x51,0x4A,0x08,0x79,0x8E,0x34,0x04,0xDD,
		0xEF,0x95,0x19,0xB3,0xCD,0x3A,0x43,0x1B,0x30,0x2B,0x0A,0x6D,
		0xF2,0x5F,0x14,0x37,0x4F,0xE1,0x35,0x6D,0x6D,0x51,0xC2,0x45,
		0xE4,0x85,0xB5,0x76,0x62,0x5E,0x7E,0xC6,0xF4,0x4C,0x42,0xE9,
		0xA6,0x37,0xED,0x6B,0x0B,0xFF,0x5C,0xB6,0xF4,0x06,0xB7,0xED,
		0xEE,0x38,0x6B,0xFB,0x5A,0x89,0x9F,0xA5,0xAE,0x9F,0x24,0x11,
		0x7C,0x4B,0x1F,0xE6,0x49,0x28,0x66,0x51,0xEC,0xE4,0x5B,0x3D,
		0xC2,0x00,0x7C,0xB8,0xA1,0x63,0xBF,0x05,0x98,0xDA,0x48,0x36,
		0x1C,0x55,0xD3,0x9A,0x69,0x16,0x3F,0xA8,0xFD,0x24,0xCF,0x5F,
		0x83,0x65,0x5D,0x23,0xDC,0xA3,0xAD,0x96,0x1C,0x62,0xF3,0x56,
		0x20,0x85,0x52,0xBB,0x9E,0xD5,0x29,0x07,0x70,0x96,0x96,0x6D,
		0x67,0x0C,0x35,0x4E,0x4A,0xBC,0x98,0x04,0xF1,0x74,0x6C,0x08,
		0xCA,0x18,0x21,0x7C,0x32,0x90,0x5E,0x46,0x2E,0x36,0xCE,0x3B,
		0xE3,0x9E,0x77,0x2C,0x18,0x0E,0x86,0x03,0x9B,0x27,0x83,0xA2,
		0xEC,0x07,0xA2,0x8F,0xB5,0xC5,0x5D,0xF0,0x6F,0x4C,0x52,0xC9,
		0xDE,0x2B,0xCB,0xF6,0x95,0x58,0x17,0x18,0x39,0x95,0x49,0x7C,
		0xEA,0x95,0x6A,0xE5,0x15,0xD2,0x26,0x18,0x98,0xFA,0x05,0x10,
		0x15,0x72,0x8E,0x5A,0x8A,0xAC,0xAA,0x68,0xFF,0xFF,0xFF,0xFF,
		0xFF,0xFF,0xFF,0xFF,
	};
#endif
	DH *dh = DH_new();
	if (dh) {
#if OPENSSL_VERSION_NUMBER >= 0x0090801fL
		dh->p = get_rfc3526_prime_2048(NULL);
#else
		dh->p = BN_bin2bn(rfc_3526_prime_2048, sizeof rfc_3526_prime_2048, NULL);
#endif
		/* See RFC 3526, Section 3 "2048-bit MODP Group"
		   for the reason why 2 is used as generator.
		*/
		BN_dec2bn(&dh->g, "2");
		if (!dh->p || !dh->g) {
			DH_free(dh);
			dh = NULL;
		}
	}
	return dh;
}

static DH *ssl_get_dh_4096(void)
{
#if OPENSSL_VERSION_NUMBER < 0x0090801fL
	static const unsigned char rfc_3526_prime_4096[] = {
                0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xC9,0x0F,0xDA,0xA2,
                0x21,0x68,0xC2,0x34,0xC4,0xC6,0x62,0x8B,0x80,0xDC,0x1C,0xD1,
                0x29,0x02,0x4E,0x08,0x8A,0x67,0xCC,0x74,0x02,0x0B,0xBE,0xA6,
                0x3B,0x13,0x9B,0x22,0x51,0x4A,0x08,0x79,0x8E,0x34,0x04,0xDD,
                0xEF,0x95,0x19,0xB3,0xCD,0x3A,0x43,0x1B,0x30,0x2B,0x0A,0x6D,
                0xF2,0x5F,0x14,0x37,0x4F,0xE1,0x35,0x6D,0x6D,0x51,0xC2,0x45,
                0xE4,0x85,0xB5,0x76,0x62,0x5E,0x7E,0xC6,0xF4,0x4C,0x42,0xE9,
                0xA6,0x37,0xED,0x6B,0x0B,0xFF,0x5C,0xB6,0xF4,0x06,0xB7,0xED,
                0xEE,0x38,0x6B,0xFB,0x5A,0x89,0x9F,0xA5,0xAE,0x9F,0x24,0x11,
                0x7C,0x4B,0x1F,0xE6,0x49,0x28,0x66,0x51,0xEC,0xE4,0x5B,0x3D,
                0xC2,0x00,0x7C,0xB8,0xA1,0x63,0xBF,0x05,0x98,0xDA,0x48,0x36,
                0x1C,0x55,0xD3,0x9A,0x69,0x16,0x3F,0xA8,0xFD,0x24,0xCF,0x5F,
                0x83,0x65,0x5D,0x23,0xDC,0xA3,0xAD,0x96,0x1C,0x62,0xF3,0x56,
                0x20,0x85,0x52,0xBB,0x9E,0xD5,0x29,0x07,0x70,0x96,0x96,0x6D,
                0x67,0x0C,0x35,0x4E,0x4A,0xBC,0x98,0x04,0xF1,0x74,0x6C,0x08,
                0xCA,0x18,0x21,0x7C,0x32,0x90,0x5E,0x46,0x2E,0x36,0xCE,0x3B,
                0xE3,0x9E,0x77,0x2C,0x18,0x0E,0x86,0x03,0x9B,0x27,0x83,0xA2,
                0xEC,0x07,0xA2,0x8F,0xB5,0xC5,0x5D,0xF0,0x6F,0x4C,0x52,0xC9,
                0xDE,0x2B,0xCB,0xF6,0x95,0x58,0x17,0x18,0x39,0x95,0x49,0x7C,
                0xEA,0x95,0x6A,0xE5,0x15,0xD2,0x26,0x18,0x98,0xFA,0x05,0x10,
                0x15,0x72,0x8E,0x5A,0x8A,0xAA,0xC4,0x2D,0xAD,0x33,0x17,0x0D,
                0x04,0x50,0x7A,0x33,0xA8,0x55,0x21,0xAB,0xDF,0x1C,0xBA,0x64,
                0xEC,0xFB,0x85,0x04,0x58,0xDB,0xEF,0x0A,0x8A,0xEA,0x71,0x57,
                0x5D,0x06,0x0C,0x7D,0xB3,0x97,0x0F,0x85,0xA6,0xE1,0xE4,0xC7,
                0xAB,0xF5,0xAE,0x8C,0xDB,0x09,0x33,0xD7,0x1E,0x8C,0x94,0xE0,
                0x4A,0x25,0x61,0x9D,0xCE,0xE3,0xD2,0x26,0x1A,0xD2,0xEE,0x6B,
                0xF1,0x2F,0xFA,0x06,0xD9,0x8A,0x08,0x64,0xD8,0x76,0x02,0x73,
                0x3E,0xC8,0x6A,0x64,0x52,0x1F,0x2B,0x18,0x17,0x7B,0x20,0x0C,
                0xBB,0xE1,0x17,0x57,0x7A,0x61,0x5D,0x6C,0x77,0x09,0x88,0xC0,
                0xBA,0xD9,0x46,0xE2,0x08,0xE2,0x4F,0xA0,0x74,0xE5,0xAB,0x31,
                0x43,0xDB,0x5B,0xFC,0xE0,0xFD,0x10,0x8E,0x4B,0x82,0xD1,0x20,
                0xA9,0x21,0x08,0x01,0x1A,0x72,0x3C,0x12,0xA7,0x87,0xE6,0xD7,
                0x88,0x71,0x9A,0x10,0xBD,0xBA,0x5B,0x26,0x99,0xC3,0x27,0x18,
                0x6A,0xF4,0xE2,0x3C,0x1A,0x94,0x68,0x34,0xB6,0x15,0x0B,0xDA,
                0x25,0x83,0xE9,0xCA,0x2A,0xD4,0x4C,0xE8,0xDB,0xBB,0xC2,0xDB,
                0x04,0xDE,0x8E,0xF9,0x2E,0x8E,0xFC,0x14,0x1F,0xBE,0xCA,0xA6,
                0x28,0x7C,0x59,0x47,0x4E,0x6B,0xC0,0x5D,0x99,0xB2,0x96,0x4F,
                0xA0,0x90,0xC3,0xA2,0x23,0x3B,0xA1,0x86,0x51,0x5B,0xE7,0xED,
                0x1F,0x61,0x29,0x70,0xCE,0xE2,0xD7,0xAF,0xB8,0x1B,0xDD,0x76,
                0x21,0x70,0x48,0x1C,0xD0,0x06,0x91,0x27,0xD5,0xB0,0x5A,0xA9,
                0x93,0xB4,0xEA,0x98,0x8D,0x8F,0xDD,0xC1,0x86,0xFF,0xB7,0xDC,
                0x90,0xA6,0xC0,0x8F,0x4D,0xF4,0x35,0xC9,0x34,0x06,0x31,0x99,
                0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
	};
#endif
	DH *dh = DH_new();
	if (dh) {
#if OPENSSL_VERSION_NUMBER >= 0x0090801fL
		dh->p = get_rfc3526_prime_4096(NULL);
#else
		dh->p = BN_bin2bn(rfc_3526_prime_4096, sizeof rfc_3526_prime_4096, NULL);
#endif
		/* See RFC 3526, Section 5 "4096-bit MODP Group"
		   for the reason why 2 is used as generator.
		*/
		BN_dec2bn(&dh->g, "2");
		if (!dh->p || !dh->g) {
			DH_free(dh);
			dh = NULL;
		}
	}
	return dh;
}

static DH *ssl_get_dh_8192(void)
{
#if OPENSSL_VERSION_NUMBER < 0x0090801fL
	static const unsigned char rfc_3526_prime_8192[] = {
                0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xC9,0x0F,0xDA,0xA2,
                0x21,0x68,0xC2,0x34,0xC4,0xC6,0x62,0x8B,0x80,0xDC,0x1C,0xD1,
                0x29,0x02,0x4E,0x08,0x8A,0x67,0xCC,0x74,0x02,0x0B,0xBE,0xA6,
                0x3B,0x13,0x9B,0x22,0x51,0x4A,0x08,0x79,0x8E,0x34,0x04,0xDD,
                0xEF,0x95,0x19,0xB3,0xCD,0x3A,0x43,0x1B,0x30,0x2B,0x0A,0x6D,
                0xF2,0x5F,0x14,0x37,0x4F,0xE1,0x35,0x6D,0x6D,0x51,0xC2,0x45,
                0xE4,0x85,0xB5,0x76,0x62,0x5E,0x7E,0xC6,0xF4,0x4C,0x42,0xE9,
                0xA6,0x37,0xED,0x6B,0x0B,0xFF,0x5C,0xB6,0xF4,0x06,0xB7,0xED,
                0xEE,0x38,0x6B,0xFB,0x5A,0x89,0x9F,0xA5,0xAE,0x9F,0x24,0x11,
                0x7C,0x4B,0x1F,0xE6,0x49,0x28,0x66,0x51,0xEC,0xE4,0x5B,0x3D,
                0xC2,0x00,0x7C,0xB8,0xA1,0x63,0xBF,0x05,0x98,0xDA,0x48,0x36,
                0x1C,0x55,0xD3,0x9A,0x69,0x16,0x3F,0xA8,0xFD,0x24,0xCF,0x5F,
                0x83,0x65,0x5D,0x23,0xDC,0xA3,0xAD,0x96,0x1C,0x62,0xF3,0x56,
                0x20,0x85,0x52,0xBB,0x9E,0xD5,0x29,0x07,0x70,0x96,0x96,0x6D,
                0x67,0x0C,0x35,0x4E,0x4A,0xBC,0x98,0x04,0xF1,0x74,0x6C,0x08,
                0xCA,0x18,0x21,0x7C,0x32,0x90,0x5E,0x46,0x2E,0x36,0xCE,0x3B,
                0xE3,0x9E,0x77,0x2C,0x18,0x0E,0x86,0x03,0x9B,0x27,0x83,0xA2,
                0xEC,0x07,0xA2,0x8F,0xB5,0xC5,0x5D,0xF0,0x6F,0x4C,0x52,0xC9,
                0xDE,0x2B,0xCB,0xF6,0x95,0x58,0x17,0x18,0x39,0x95,0x49,0x7C,
                0xEA,0x95,0x6A,0xE5,0x15,0xD2,0x26,0x18,0x98,0xFA,0x05,0x10,
                0x15,0x72,0x8E,0x5A,0x8A,0xAA,0xC4,0x2D,0xAD,0x33,0x17,0x0D,
                0x04,0x50,0x7A,0x33,0xA8,0x55,0x21,0xAB,0xDF,0x1C,0xBA,0x64,
                0xEC,0xFB,0x85,0x04,0x58,0xDB,0xEF,0x0A,0x8A,0xEA,0x71,0x57,
                0x5D,0x06,0x0C,0x7D,0xB3,0x97,0x0F,0x85,0xA6,0xE1,0xE4,0xC7,
                0xAB,0xF5,0xAE,0x8C,0xDB,0x09,0x33,0xD7,0x1E,0x8C,0x94,0xE0,
                0x4A,0x25,0x61,0x9D,0xCE,0xE3,0xD2,0x26,0x1A,0xD2,0xEE,0x6B,
                0xF1,0x2F,0xFA,0x06,0xD9,0x8A,0x08,0x64,0xD8,0x76,0x02,0x73,
                0x3E,0xC8,0x6A,0x64,0x52,0x1F,0x2B,0x18,0x17,0x7B,0x20,0x0C,
                0xBB,0xE1,0x17,0x57,0x7A,0x61,0x5D,0x6C,0x77,0x09,0x88,0xC0,
                0xBA,0xD9,0x46,0xE2,0x08,0xE2,0x4F,0xA0,0x74,0xE5,0xAB,0x31,
                0x43,0xDB,0x5B,0xFC,0xE0,0xFD,0x10,0x8E,0x4B,0x82,0xD1,0x20,
                0xA9,0x21,0x08,0x01,0x1A,0x72,0x3C,0x12,0xA7,0x87,0xE6,0xD7,
                0x88,0x71,0x9A,0x10,0xBD,0xBA,0x5B,0x26,0x99,0xC3,0x27,0x18,
                0x6A,0xF4,0xE2,0x3C,0x1A,0x94,0x68,0x34,0xB6,0x15,0x0B,0xDA,
                0x25,0x83,0xE9,0xCA,0x2A,0xD4,0x4C,0xE8,0xDB,0xBB,0xC2,0xDB,
                0x04,0xDE,0x8E,0xF9,0x2E,0x8E,0xFC,0x14,0x1F,0xBE,0xCA,0xA6,
                0x28,0x7C,0x59,0x47,0x4E,0x6B,0xC0,0x5D,0x99,0xB2,0x96,0x4F,
                0xA0,0x90,0xC3,0xA2,0x23,0x3B,0xA1,0x86,0x51,0x5B,0xE7,0xED,
                0x1F,0x61,0x29,0x70,0xCE,0xE2,0xD7,0xAF,0xB8,0x1B,0xDD,0x76,
                0x21,0x70,0x48,0x1C,0xD0,0x06,0x91,0x27,0xD5,0xB0,0x5A,0xA9,
                0x93,0xB4,0xEA,0x98,0x8D,0x8F,0xDD,0xC1,0x86,0xFF,0xB7,0xDC,
                0x90,0xA6,0xC0,0x8F,0x4D,0xF4,0x35,0xC9,0x34,0x02,0x84,0x92,
                0x36,0xC3,0xFA,0xB4,0xD2,0x7C,0x70,0x26,0xC1,0xD4,0xDC,0xB2,
                0x60,0x26,0x46,0xDE,0xC9,0x75,0x1E,0x76,0x3D,0xBA,0x37,0xBD,
                0xF8,0xFF,0x94,0x06,0xAD,0x9E,0x53,0x0E,0xE5,0xDB,0x38,0x2F,
                0x41,0x30,0x01,0xAE,0xB0,0x6A,0x53,0xED,0x90,0x27,0xD8,0x31,
                0x17,0x97,0x27,0xB0,0x86,0x5A,0x89,0x18,0xDA,0x3E,0xDB,0xEB,
                0xCF,0x9B,0x14,0xED,0x44,0xCE,0x6C,0xBA,0xCE,0xD4,0xBB,0x1B,
                0xDB,0x7F,0x14,0x47,0xE6,0xCC,0x25,0x4B,0x33,0x20,0x51,0x51,
                0x2B,0xD7,0xAF,0x42,0x6F,0xB8,0xF4,0x01,0x37,0x8C,0xD2,0xBF,
                0x59,0x83,0xCA,0x01,0xC6,0x4B,0x92,0xEC,0xF0,0x32,0xEA,0x15,
                0xD1,0x72,0x1D,0x03,0xF4,0x82,0xD7,0xCE,0x6E,0x74,0xFE,0xF6,
                0xD5,0x5E,0x70,0x2F,0x46,0x98,0x0C,0x82,0xB5,0xA8,0x40,0x31,
                0x90,0x0B,0x1C,0x9E,0x59,0xE7,0xC9,0x7F,0xBE,0xC7,0xE8,0xF3,
                0x23,0xA9,0x7A,0x7E,0x36,0xCC,0x88,0xBE,0x0F,0x1D,0x45,0xB7,
                0xFF,0x58,0x5A,0xC5,0x4B,0xD4,0x07,0xB2,0x2B,0x41,0x54,0xAA,
                0xCC,0x8F,0x6D,0x7E,0xBF,0x48,0xE1,0xD8,0x14,0xCC,0x5E,0xD2,
                0x0F,0x80,0x37,0xE0,0xA7,0x97,0x15,0xEE,0xF2,0x9B,0xE3,0x28,
                0x06,0xA1,0xD5,0x8B,0xB7,0xC5,0xDA,0x76,0xF5,0x50,0xAA,0x3D,
                0x8A,0x1F,0xBF,0xF0,0xEB,0x19,0xCC,0xB1,0xA3,0x13,0xD5,0x5C,
                0xDA,0x56,0xC9,0xEC,0x2E,0xF2,0x96,0x32,0x38,0x7F,0xE8,0xD7,
                0x6E,0x3C,0x04,0x68,0x04,0x3E,0x8F,0x66,0x3F,0x48,0x60,0xEE,
                0x12,0xBF,0x2D,0x5B,0x0B,0x74,0x74,0xD6,0xE6,0x94,0xF9,0x1E,
                0x6D,0xBE,0x11,0x59,0x74,0xA3,0x92,0x6F,0x12,0xFE,0xE5,0xE4,
                0x38,0x77,0x7C,0xB6,0xA9,0x32,0xDF,0x8C,0xD8,0xBE,0xC4,0xD0,
                0x73,0xB9,0x31,0xBA,0x3B,0xC8,0x32,0xB6,0x8D,0x9D,0xD3,0x00,
                0x74,0x1F,0xA7,0xBF,0x8A,0xFC,0x47,0xED,0x25,0x76,0xF6,0x93,
                0x6B,0xA4,0x24,0x66,0x3A,0xAB,0x63,0x9C,0x5A,0xE4,0xF5,0x68,
                0x34,0x23,0xB4,0x74,0x2B,0xF1,0xC9,0x78,0x23,0x8F,0x16,0xCB,
                0xE3,0x9D,0x65,0x2D,0xE3,0xFD,0xB8,0xBE,0xFC,0x84,0x8A,0xD9,
                0x22,0x22,0x2E,0x04,0xA4,0x03,0x7C,0x07,0x13,0xEB,0x57,0xA8,
                0x1A,0x23,0xF0,0xC7,0x34,0x73,0xFC,0x64,0x6C,0xEA,0x30,0x6B,
                0x4B,0xCB,0xC8,0x86,0x2F,0x83,0x85,0xDD,0xFA,0x9D,0x4B,0x7F,
                0xA2,0xC0,0x87,0xE8,0x79,0x68,0x33,0x03,0xED,0x5B,0xDD,0x3A,
                0x06,0x2B,0x3C,0xF5,0xB3,0xA2,0x78,0xA6,0x6D,0x2A,0x13,0xF8,
                0x3F,0x44,0xF8,0x2D,0xDF,0x31,0x0E,0xE0,0x74,0xAB,0x6A,0x36,
                0x45,0x97,0xE8,0x99,0xA0,0x25,0x5D,0xC1,0x64,0xF3,0x1C,0xC5,
                0x08,0x46,0x85,0x1D,0xF9,0xAB,0x48,0x19,0x5D,0xED,0x7E,0xA1,
                0xB1,0xD5,0x10,0xBD,0x7E,0xE7,0x4D,0x73,0xFA,0xF3,0x6B,0xC3,
                0x1E,0xCF,0xA2,0x68,0x35,0x90,0x46,0xF4,0xEB,0x87,0x9F,0x92,
                0x40,0x09,0x43,0x8B,0x48,0x1C,0x6C,0xD7,0x88,0x9A,0x00,0x2E,
                0xD5,0xEE,0x38,0x2B,0xC9,0x19,0x0D,0xA6,0xFC,0x02,0x6E,0x47,
                0x95,0x58,0xE4,0x47,0x56,0x77,0xE9,0xAA,0x9E,0x30,0x50,0xE2,
                0x76,0x56,0x94,0xDF,0xC8,0x1F,0x56,0xE8,0x80,0xB9,0x6E,0x71,
                0x60,0xC9,0x80,0xDD,0x98,0xED,0xD3,0xDF,0xFF,0xFF,0xFF,0xFF,
                0xFF,0xFF,0xFF,0xFF,
	};
#endif
	DH *dh = DH_new();
	if (dh) {
#if OPENSSL_VERSION_NUMBER >= 0x0090801fL
		dh->p = get_rfc3526_prime_8192(NULL);
#else
		dh->p = BN_bin2bn(rfc_3526_prime_8192, sizeof rfc_3526_prime_8192, NULL);
#endif
		/* See RFC 3526, Section 7 "8192-bit MODP Group"
		   for the reason why 2 is used as generator.
		*/
		BN_dec2bn(&dh->g, "2");
		if (!dh->p || !dh->g) {
			DH_free(dh);
			dh = NULL;
		}
	}
	return dh;
}

/* Returns Diffie-Hellman parameters matching the private key length
   but not exceeding global.tune.ssl_default_dh_param */
static DH *ssl_get_tmp_dh(SSL *ssl, int export, int keylen)
{
	DH *dh = NULL;
	EVP_PKEY *pkey = SSL_get_privatekey(ssl);
	int type = pkey ? EVP_PKEY_type(pkey->type) : EVP_PKEY_NONE;

	/* The keylen supplied by OpenSSL can only be 512 or 1024.
	   See ssl3_send_server_key_exchange() in ssl/s3_srvr.c
	 */
	if (type == EVP_PKEY_RSA || type == EVP_PKEY_DSA) {
		keylen = EVP_PKEY_bits(pkey);
	}

	if (keylen > global.tune.ssl_default_dh_param) {
		keylen = global.tune.ssl_default_dh_param;
	}

	if (keylen >= 8192) {
		dh = local_dh_8192;
	}
	else if (keylen >= 4096) {
		dh = local_dh_4096;
	}
	else if (keylen >= 2048) {
		dh = local_dh_2048;
	}
	else {
		dh = local_dh_1024;
	}

	return dh;
}

/* Loads Diffie-Hellman parameter from a file. Returns 1 if loaded, else -1
   if an error occured, and 0 if parameter not found. */
int ssl_sock_load_dh_params(SSL_CTX *ctx, const char *file)
{
	int ret = -1;
	BIO *in;
	DH *dh = NULL;

	in = BIO_new(BIO_s_file());
	if (in == NULL)
		goto end;

	if (BIO_read_filename(in, file) <= 0)
		goto end;

	dh = PEM_read_bio_DHparams(in, NULL, ctx->default_passwd_callback, ctx->default_passwd_callback_userdata);
	if (dh) {
		ret = 1;
		SSL_CTX_set_tmp_dh(ctx, dh);
		/* Setting ssl default dh param to the size of the static DH params
		   found in the file. This way we know that there is no use
		   complaining later about ssl-default-dh-param not being set. */
		global.tune.ssl_default_dh_param = DH_size(dh) * 8;
	}
	else {
		/* Clear openssl global errors stack */
		ERR_clear_error();

		if (global.tune.ssl_default_dh_param <= 1024) {
			/* we are limited to DH parameter of 1024 bits anyway */
			local_dh_1024 = ssl_get_dh_1024();
			if (local_dh_1024 == NULL)
				goto end;

			SSL_CTX_set_tmp_dh(ctx, local_dh_1024);
		}
		else {
			SSL_CTX_set_tmp_dh_callback(ctx, ssl_get_tmp_dh);
		}

		ret = 0; /* DH params not found */
	}

end:
	if (dh)
		DH_free(dh);

	if (in)
		BIO_free(in);

	return ret;
}
#endif

static int ssl_sock_add_cert_sni(SSL_CTX *ctx, struct bind_conf *s, char *name, int order)
{
	struct sni_ctx *sc;
	int wild = 0, neg = 0;

	if (*name == '!') {
		neg = 1;
		name++;
	}
	if (*name == '*') {
		wild = 1;
		name++;
	}
	/* !* filter is a nop */
	if (neg && wild)
		return order;
	if (*name) {
		int j, len;
		len = strlen(name);
		sc = malloc(sizeof(struct sni_ctx) + len + 1);
		for (j = 0; j < len; j++)
			sc->name.key[j] = tolower(name[j]);
		sc->name.key[len] = 0;
		sc->ctx = ctx;
		sc->order = order++;
		sc->neg = neg;
		if (wild)
			ebst_insert(&s->sni_w_ctx, &sc->name);
		else
			ebst_insert(&s->sni_ctx, &sc->name);
	}
	return order;
}

/* 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.
 */
static int ssl_sock_load_cert_chain_file(SSL_CTX *ctx, const char *file, struct bind_conf *s, char **sni_filter, int fcount)
{
	BIO *in;
	X509 *x = NULL, *ca;
	int i, err;
	int ret = -1;
	int order = 0;
	X509_NAME *xname;
	char *str;
#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;

	if (fcount) {
		while (fcount--)
			order = ssl_sock_add_cert_sni(ctx, s, sni_filter[fcount], order);
	}
	else {
#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) {
						order = ssl_sock_add_cert_sni(ctx, s, str, order);
						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) {
				order = ssl_sock_add_cert_sni(ctx, s, str, order);
				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;
}

static int ssl_sock_load_cert_file(const char *path, struct bind_conf *bind_conf, struct proxy *curproxy, char **sni_filter, int fcount, char **err)
{
	int ret;
	SSL_CTX *ctx;

	ctx = SSL_CTX_new(SSLv23_server_method());
	if (!ctx) {
		memprintf(err, "%sunable to allocate SSL context for cert '%s'.\n",
		          err && *err ? *err : "", path);
		return 1;
	}

	if (SSL_CTX_use_PrivateKey_file(ctx, path, SSL_FILETYPE_PEM) <= 0) {
		memprintf(err, "%sunable to load SSL private key from PEM file '%s'.\n",
		          err && *err ? *err : "", path);
		SSL_CTX_free(ctx);
		return 1;
	}

	ret = ssl_sock_load_cert_chain_file(ctx, path, bind_conf, sni_filter, fcount);
	if (ret <= 0) {
		memprintf(err, "%sunable to load SSL certificate from PEM file '%s'.\n",
		          err && *err ? *err : "", path);
		if (ret < 0) /* serious error, must do that ourselves */
			SSL_CTX_free(ctx);
		return 1;
	}

	if (SSL_CTX_check_private_key(ctx) <= 0) {
		memprintf(err, "%sinconsistencies between private key and certificate loaded from PEM file '%s'.\n",
		          err && *err ? *err : "", path);
		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 OPENSSL_NO_DH
	ret = ssl_sock_load_dh_params(ctx, path);
	if (ret < 0) {
		if (err)
			memprintf(err, "%sunable to load DH parameters from file '%s'.\n",
				  *err ? *err : "", path);
		return 1;
	}
#endif

#ifdef SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB
	ret = ssl_sock_load_ocsp(ctx, path);
	if (ret < 0) {
		if (err)
			memprintf(err, "%s '%s.ocsp' is present and activates OCSP but it is impossible to compute the OCSP certificate ID (maybe the issuer could not be found)'.\n",
				  *err ? *err : "", path);
		return 1;
	}
#endif

#ifndef SSL_CTRL_SET_TLSEXT_HOSTNAME
	if (bind_conf->default_ctx) {
		memprintf(err, "%sthis version of openssl cannot load multiple SSL certificates.\n",
		          err && *err ? *err : "");
		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, char **err)
{
	struct dirent *de;
	DIR *dir;
	struct stat buf;
	char *end;
	char fp[MAXPATHLEN+1];
	int cfgerr = 0;

	if (!(dir = opendir(path)))
		return ssl_sock_load_cert_file(path, bind_conf, curproxy, NULL, 0, err);

	/* strip trailing slashes, including first one */
	for (end = path + strlen(path) - 1; end >= path && *end == '/'; end--)
		*end = 0;

	while ((de = readdir(dir))) {
		end = strrchr(de->d_name, '.');
		if (end && (!strcmp(end, ".issuer") || !strcmp(end, ".ocsp")))
			continue;

		snprintf(fp, sizeof(fp), "%s/%s", path, de->d_name);
		if (stat(fp, &buf) != 0) {
			memprintf(err, "%sunable to stat SSL certificate from file '%s' : %s.\n",
			          err && *err ? *err : "", fp, strerror(errno));
			cfgerr++;
			continue;
		}
		if (!S_ISREG(buf.st_mode))
			continue;
		cfgerr += ssl_sock_load_cert_file(fp, bind_conf, curproxy, NULL, 0, err);
	}
	closedir(dir);
	return cfgerr;
}

/* Make sure openssl opens /dev/urandom before the chroot. The work is only
 * done once. Zero is returned if the operation fails. No error is returned
 * if the random is said as not implemented, because we expect that openssl
 * will use another method once needed.
 */
static int ssl_initialize_random()
{
	unsigned char random;
	static int random_initialized = 0;

	if (!random_initialized && RAND_bytes(&random, 1) != 0)
		random_initialized = 1;

	return random_initialized;
}

int ssl_sock_load_cert_list_file(char *file, struct bind_conf *bind_conf, struct proxy *curproxy, char **err)
{
	char thisline[LINESIZE];
	FILE *f;
	int linenum = 0;
	int cfgerr = 0;

	if ((f = fopen(file, "r")) == NULL) {
		memprintf(err, "cannot open file '%s' : %s", file, strerror(errno));
		return 1;
	}

	while (fgets(thisline, sizeof(thisline), f) != NULL) {
		int arg;
		int newarg;
		char *end;
		char *args[MAX_LINE_ARGS + 1];
		char *line = thisline;

		linenum++;
		end = line + strlen(line);
		if (end-line == sizeof(thisline)-1 && *(end-1) != '\n') {
			/* Check if we reached the limit and the last char is not \n.
			 * Watch out for the last line without the terminating '\n'!
			 */
			memprintf(err, "line %d too long in file '%s', limit is %d characters",
				  linenum, file, (int)sizeof(thisline)-1);
			cfgerr = 1;
			break;
		}

		arg = 0;
		newarg = 1;
		while (*line) {
			if (*line == '#' || *line == '\n' || *line == '\r') {
				/* end of string, end of loop */
				*line = 0;
				break;
			}
			else if (isspace(*line)) {
				newarg = 1;
				*line = 0;
			}
			else if (newarg) {
				if (arg == MAX_LINE_ARGS) {
					memprintf(err, "too many args on line %d in file '%s'.",
						  linenum, file);
					cfgerr = 1;
					break;
				}
				newarg = 0;
				args[arg++] = line;
			}
			line++;
		}
		if (cfgerr)
			break;

		/* empty line */
		if (!arg)
			continue;

		cfgerr = ssl_sock_load_cert_file(args[0], bind_conf, curproxy, &args[1], arg-1, err);
		if (cfgerr) {
			memprintf(err, "error processing line %d in file '%s' : %s", linenum, file, *err);
			break;
		}
	}
	fclose(f);
	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
#define SSL_renegotiate_pending(arg) 0
#endif
#ifndef SSL_OP_SINGLE_ECDH_USE                          /* needs OpenSSL >= 0.9.8 */
#define SSL_OP_SINGLE_ECDH_USE 0
#endif
#ifndef SSL_OP_NO_TICKET                                /* needs OpenSSL >= 0.9.8 */
#define SSL_OP_NO_TICKET 0
#endif
#ifndef SSL_OP_NO_COMPRESSION                           /* needs OpenSSL >= 0.9.9 */
#define SSL_OP_NO_COMPRESSION 0
#endif
#ifndef SSL_OP_NO_TLSv1_1                               /* needs OpenSSL >= 1.0.1 */
#define SSL_OP_NO_TLSv1_1 0
#endif
#ifndef SSL_OP_NO_TLSv1_2                               /* needs OpenSSL >= 1.0.1 */
#define SSL_OP_NO_TLSv1_2 0
#endif
#ifndef SSL_OP_SINGLE_DH_USE                            /* needs OpenSSL >= 0.9.6 */
#define SSL_OP_SINGLE_DH_USE 0
#endif
#ifndef SSL_OP_SINGLE_ECDH_USE                            /* needs OpenSSL >= 1.0.0 */
#define SSL_OP_SINGLE_ECDH_USE 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 verify = SSL_VERIFY_NONE;
	long ssloptions =
		SSL_OP_ALL | /* all known workarounds for bugs */
		SSL_OP_NO_SSLv2 |
		SSL_OP_NO_COMPRESSION |
		SSL_OP_SINGLE_DH_USE |
		SSL_OP_SINGLE_ECDH_USE |
		SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION |
		SSL_OP_CIPHER_SERVER_PREFERENCE;
	long sslmode =
		SSL_MODE_ENABLE_PARTIAL_WRITE |
		SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER |
		SSL_MODE_RELEASE_BUFFERS;
	STACK_OF(SSL_CIPHER) * ciphers = NULL;
	SSL_CIPHER * cipher = NULL;
	char cipher_description[128];
	/* The description of ciphers using an Ephemeral Diffie Hellman key exchange
	   contains " Kx=DH " or " Kx=DH(". Beware of " Kx=DH/",
	   which is not ephemeral DH. */
	const char dhe_description[] = " Kx=DH ";
	const char dhe_export_description[] = " Kx=DH(";
	int idx = 0;
	int dhe_found = 0;

	/* Make sure openssl opens /dev/urandom before the chroot */
	if (!ssl_initialize_random()) {
		Alert("OpenSSL random data generator initialization failed.\n");
		cfgerr++;
	}

	if (bind_conf->ssl_options & BC_SSL_O_NO_SSLV3)
		ssloptions |= SSL_OP_NO_SSLv3;
	if (bind_conf->ssl_options & BC_SSL_O_NO_TLSV10)
		ssloptions |= SSL_OP_NO_TLSv1;
	if (bind_conf->ssl_options & BC_SSL_O_NO_TLSV11)
		ssloptions |= SSL_OP_NO_TLSv1_1;
	if (bind_conf->ssl_options & BC_SSL_O_NO_TLSV12)
		ssloptions |= SSL_OP_NO_TLSv1_2;
	if (bind_conf->ssl_options & BC_SSL_O_NO_TLS_TICKETS)
		ssloptions |= SSL_OP_NO_TICKET;
	if (bind_conf->ssl_options & BC_SSL_O_USE_SSLV3)
		SSL_CTX_set_ssl_version(ctx, SSLv3_server_method());
	if (bind_conf->ssl_options & BC_SSL_O_USE_TLSV10)
		SSL_CTX_set_ssl_version(ctx, TLSv1_server_method());
#if SSL_OP_NO_TLSv1_1
	if (bind_conf->ssl_options & BC_SSL_O_USE_TLSV11)
		SSL_CTX_set_ssl_version(ctx, TLSv1_1_server_method());
#endif
#if SSL_OP_NO_TLSv1_2
	if (bind_conf->ssl_options & BC_SSL_O_USE_TLSV12)
		SSL_CTX_set_ssl_version(ctx, TLSv1_2_server_method());
#endif

	SSL_CTX_set_options(ctx, ssloptions);
	SSL_CTX_set_mode(ctx, sslmode);
	switch (bind_conf->verify) {
		case SSL_SOCK_VERIFY_NONE:
			verify = SSL_VERIFY_NONE;
			break;
		case SSL_SOCK_VERIFY_OPTIONAL:
			verify = SSL_VERIFY_PEER;
			break;
		case SSL_SOCK_VERIFY_REQUIRED:
			verify = SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
			break;
	}
	SSL_CTX_set_verify(ctx, verify, ssl_sock_bind_verifycbk);
	if (verify & SSL_VERIFY_PEER) {
		if (bind_conf->ca_file) {
			/* load CAfile to verify */
			if (!SSL_CTX_load_verify_locations(ctx, bind_conf->ca_file, NULL)) {
				Alert("Proxy '%s': unable to load CA file '%s' for bind '%s' at [%s:%d].\n",
				      curproxy->id, bind_conf->ca_file, bind_conf->arg, bind_conf->file, bind_conf->line);
				cfgerr++;
			}
			/* set CA names fo client cert request, function returns void */
			SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(bind_conf->ca_file));
		}
		else {
			Alert("Proxy '%s': verify is enabled but no CA file specified for bind '%s' at [%s:%d].\n",
			      curproxy->id, bind_conf->arg, bind_conf->file, bind_conf->line);
			cfgerr++;
		}
#ifdef X509_V_FLAG_CRL_CHECK
		if (bind_conf->crl_file) {
			X509_STORE *store = SSL_CTX_get_cert_store(ctx);

			if (!store || !X509_STORE_load_locations(store, bind_conf->crl_file, NULL)) {
				Alert("Proxy '%s': unable to configure CRL file '%s' for bind '%s' at [%s:%d].\n",
				      curproxy->id, bind_conf->ca_file, bind_conf->arg, bind_conf->file, bind_conf->line);
				cfgerr++;
			}
			else {
				X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL);
			}
		}
#endif
		ERR_clear_error();
	}

	if (global.tune.ssllifetime)
		SSL_CTX_set_timeout(ctx, global.tune.ssllifetime);

	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++;
	}

	/* If tune.ssl.default-dh-param has not been set and
	   no static DH params were in the certificate file. */
	if (global.tune.ssl_default_dh_param == 0) {
		ciphers = ctx->cipher_list;

		if (ciphers) {
			for (idx = 0; idx < sk_SSL_CIPHER_num(ciphers); idx++) {
				cipher = sk_SSL_CIPHER_value(ciphers, idx);
				if (SSL_CIPHER_description(cipher, cipher_description, sizeof (cipher_description)) == cipher_description) {
					if (strstr(cipher_description, dhe_description) != NULL ||
					    strstr(cipher_description, dhe_export_description) != NULL) {
						dhe_found = 1;
						break;
					}
				}
			}

			if (dhe_found) {
				Warning("Setting tune.ssl.default-dh-param to 1024 by default, if your workload permits it you should set it to at least 2048. Please set a value >= 1024 to make this warning disappear.\n");
			}
		}

		global.tune.ssl_default_dh_param = 1024;
	}

#ifndef OPENSSL_NO_DH
	if (global.tune.ssl_default_dh_param >= 1024) {
		if (local_dh_1024 == NULL) {
			local_dh_1024 = ssl_get_dh_1024();
		}
		if (global.tune.ssl_default_dh_param >= 2048) {
			if (local_dh_2048 == NULL) {
				local_dh_2048 = ssl_get_dh_2048();
			}
			if (global.tune.ssl_default_dh_param >= 4096) {
				if (local_dh_4096 == NULL) {
					local_dh_4096 = ssl_get_dh_4096();
				}
				if (global.tune.ssl_default_dh_param >= 8192 &&
				    local_dh_8192 == NULL) {
					local_dh_8192 = ssl_get_dh_8192();
				}
			}
		}
	}
#endif /* OPENSSL_NO_DH */

	SSL_CTX_set_info_callback(ctx, ssl_sock_infocbk);
#if OPENSSL_VERSION_NUMBER >= 0x00907000L
	SSL_CTX_set_msg_callback(ctx, ssl_sock_msgcbk);
#endif

#ifdef OPENSSL_NPN_NEGOTIATED
	if (bind_conf->npn_str)
		SSL_CTX_set_next_protos_advertised_cb(ctx, ssl_sock_advertise_npn_protos, bind_conf);
#endif
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
	if (bind_conf->alpn_str)
		SSL_CTX_set_alpn_select_cb(ctx, ssl_sock_advertise_alpn_protos, bind_conf);
#endif

#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
#if defined(SSL_CTX_set_tmp_ecdh) && !defined(OPENSSL_NO_ECDH)
	{
		int i;
		EC_KEY  *ecdh;

		i = OBJ_sn2nid(bind_conf->ecdhe ? bind_conf->ecdhe : ECDHE_DEFAULT_CURVE);
		if (!i || ((ecdh = EC_KEY_new_by_curve_name(i)) == NULL)) {
			Alert("Proxy '%s': unable to set elliptic named curve to '%s' for bind '%s' at [%s:%d].\n",
			      curproxy->id, bind_conf->ecdhe ? bind_conf->ecdhe : ECDHE_DEFAULT_CURVE,
			      bind_conf->arg, bind_conf->file, bind_conf->line);
			cfgerr++;
		}
		else {
			SSL_CTX_set_tmp_ecdh(ctx, ecdh);
			EC_KEY_free(ecdh);
		}
	}
#endif

	return cfgerr;
}

static int ssl_sock_srv_hostcheck(const char *pattern, const char *hostname)
{
	const char *pattern_wildcard, *pattern_left_label_end, *hostname_left_label_end;
	size_t prefixlen, suffixlen;

	/* Trivial case */
	if (strcmp(pattern, hostname) == 0)
		return 1;

	/* The rest of this logic is based on RFC 6125, section 6.4.3
	 * (http://tools.ietf.org/html/rfc6125#section-6.4.3) */

	pattern_wildcard = NULL;
	pattern_left_label_end = pattern;
	while (*pattern_left_label_end != '.') {
		switch (*pattern_left_label_end) {
			case 0:
				/* End of label not found */
				return 0;
			case '*':
				/* If there is more than one wildcards */
                                if (pattern_wildcard)
                                        return 0;
				pattern_wildcard = pattern_left_label_end;
				break;
		}
		pattern_left_label_end++;
	}

	/* If it's not trivial and there is no wildcard, it can't
	 * match */
	if (!pattern_wildcard)
		return 0;

	/* Make sure all labels match except the leftmost */
	hostname_left_label_end = strchr(hostname, '.');
	if (!hostname_left_label_end
	    || strcmp(pattern_left_label_end, hostname_left_label_end) != 0)
		return 0;

	/* Make sure the leftmost label of the hostname is long enough
	 * that the wildcard can match */
	if (hostname_left_label_end - hostname < (pattern_left_label_end - pattern) - 1)
		return 0;

	/* Finally compare the string on either side of the
	 * wildcard */
	prefixlen = pattern_wildcard - pattern;
	suffixlen = pattern_left_label_end - (pattern_wildcard + 1);
	if ((prefixlen && (memcmp(pattern, hostname, prefixlen) != 0))
	    || (suffixlen && (memcmp(pattern_wildcard + 1, hostname_left_label_end - suffixlen, suffixlen) != 0)))
		return 0;

	return 1;
}

static int ssl_sock_srv_verifycbk(int ok, X509_STORE_CTX *ctx)
{
	SSL *ssl;
	struct connection *conn;
	char *servername;

	int depth;
	X509 *cert;
	STACK_OF(GENERAL_NAME) *alt_names;
	int i;
	X509_NAME *cert_subject;
	char *str;

	if (ok == 0)
		return ok;

	ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
	conn = (struct connection *)SSL_get_app_data(ssl);

	servername = objt_server(conn->target)->ssl_ctx.verify_host;

	/* We only need to verify the CN on the actual server cert,
	 * not the indirect CAs */
	depth = X509_STORE_CTX_get_error_depth(ctx);
	if (depth != 0)
		return ok;

	/* At this point, the cert is *not* OK unless we can find a
	 * hostname match */
	ok = 0;

	cert = X509_STORE_CTX_get_current_cert(ctx);
	/* It seems like this might happen if verify peer isn't set */
	if (!cert)
		return ok;

	alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
	if (alt_names) {
		for (i = 0; !ok && i < sk_GENERAL_NAME_num(alt_names); i++) {
			GENERAL_NAME *name = sk_GENERAL_NAME_value(alt_names, i);
			if (name->type == GEN_DNS) {
#if OPENSSL_VERSION_NUMBER < 0x00907000L
				if (ASN1_STRING_to_UTF8((unsigned char **)&str, name->d.ia5) >= 0) {
#else
				if (ASN1_STRING_to_UTF8((unsigned char **)&str, name->d.dNSName) >= 0) {
#endif
					ok = ssl_sock_srv_hostcheck(str, servername);
					OPENSSL_free(str);
				}
			}
		}
		sk_GENERAL_NAME_pop_free(alt_names, GENERAL_NAME_free);
	}

	cert_subject = X509_get_subject_name(cert);
	i = -1;
	while (!ok && (i = X509_NAME_get_index_by_NID(cert_subject, NID_commonName, i)) != -1) {
		X509_NAME_ENTRY *entry = X509_NAME_get_entry(cert_subject, i);
		if (ASN1_STRING_to_UTF8((unsigned char **)&str, entry->value) >= 0) {
			ok = ssl_sock_srv_hostcheck(str, servername);
			OPENSSL_free(str);
		}
	}

	return ok;
}

/* prepare ssl context from servers options. Returns an error count */
int ssl_sock_prepare_srv_ctx(struct server *srv, struct proxy *curproxy)
{
	int cfgerr = 0;
	long options =
		SSL_OP_ALL | /* all known workarounds for bugs */
		SSL_OP_NO_SSLv2 |
		SSL_OP_NO_COMPRESSION;
	long mode =
		SSL_MODE_ENABLE_PARTIAL_WRITE |
		SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER |
		SSL_MODE_RELEASE_BUFFERS;
	int verify = SSL_VERIFY_NONE;

	/* Make sure openssl opens /dev/urandom before the chroot */
	if (!ssl_initialize_random()) {
		Alert("OpenSSL random data generator initialization failed.\n");
		cfgerr++;
	}

	 /* Initiate SSL context for current server */
	srv->ssl_ctx.reused_sess = NULL;
	if (srv->use_ssl)
		srv->xprt = &ssl_sock;
	if (srv->check.use_ssl)
		srv->check_common.xprt = &ssl_sock;

	srv->ssl_ctx.ctx = SSL_CTX_new(SSLv23_client_method());
	if (!srv->ssl_ctx.ctx) {
		Alert("config : %s '%s', server '%s': unable to allocate ssl context.\n",
		      proxy_type_str(curproxy), curproxy->id,
		      srv->id);
		cfgerr++;
		return cfgerr;
	}
	if (srv->ssl_ctx.client_crt) {
		if (SSL_CTX_use_PrivateKey_file(srv->ssl_ctx.ctx, srv->ssl_ctx.client_crt, SSL_FILETYPE_PEM) <= 0) {
			Alert("config : %s '%s', server '%s': unable to load SSL private key from PEM file '%s'.\n",
			      proxy_type_str(curproxy), curproxy->id,
			      srv->id, srv->ssl_ctx.client_crt);
			cfgerr++;
		}
		else if (SSL_CTX_use_certificate_chain_file(srv->ssl_ctx.ctx, srv->ssl_ctx.client_crt) <= 0) {
			Alert("config : %s '%s', server '%s': unable to load ssl certificate from PEM file '%s'.\n",
			      proxy_type_str(curproxy), curproxy->id,
			      srv->id, srv->ssl_ctx.client_crt);
			cfgerr++;
		}
		else if (SSL_CTX_check_private_key(srv->ssl_ctx.ctx) <= 0) {
			Alert("config : %s '%s', server '%s': inconsistencies between private key and certificate loaded from PEM file '%s'.\n",
			      proxy_type_str(curproxy), curproxy->id,
			      srv->id, srv->ssl_ctx.client_crt);
			cfgerr++;
		}
	}

	if (srv->ssl_ctx.options & SRV_SSL_O_NO_SSLV3)
		options |= SSL_OP_NO_SSLv3;
	if (srv->ssl_ctx.options & SRV_SSL_O_NO_TLSV10)
		options |= SSL_OP_NO_TLSv1;
	if (srv->ssl_ctx.options & SRV_SSL_O_NO_TLSV11)
		options |= SSL_OP_NO_TLSv1_1;
	if (srv->ssl_ctx.options & SRV_SSL_O_NO_TLSV12)
		options |= SSL_OP_NO_TLSv1_2;
	if (srv->ssl_ctx.options & SRV_SSL_O_NO_TLS_TICKETS)
		options |= SSL_OP_NO_TICKET;
	if (srv->ssl_ctx.options & SRV_SSL_O_USE_SSLV3)
		SSL_CTX_set_ssl_version(srv->ssl_ctx.ctx, SSLv3_client_method());
	if (srv->ssl_ctx.options & SRV_SSL_O_USE_TLSV10)
		SSL_CTX_set_ssl_version(srv->ssl_ctx.ctx, TLSv1_client_method());
#if SSL_OP_NO_TLSv1_1
	if (srv->ssl_ctx.options & SRV_SSL_O_USE_TLSV11)
		SSL_CTX_set_ssl_version(srv->ssl_ctx.ctx, TLSv1_1_client_method());
#endif
#if SSL_OP_NO_TLSv1_2
	if (srv->ssl_ctx.options & SRV_SSL_O_USE_TLSV12)
		SSL_CTX_set_ssl_version(srv->ssl_ctx.ctx, TLSv1_2_client_method());
#endif

	SSL_CTX_set_options(srv->ssl_ctx.ctx, options);
	SSL_CTX_set_mode(srv->ssl_ctx.ctx, mode);

	if (global.ssl_server_verify == SSL_SERVER_VERIFY_REQUIRED)
		verify = SSL_VERIFY_PEER;

	switch (srv->ssl_ctx.verify) {
		case SSL_SOCK_VERIFY_NONE:
			verify = SSL_VERIFY_NONE;
			break;
		case SSL_SOCK_VERIFY_REQUIRED:
			verify = SSL_VERIFY_PEER;
			break;
	}
	SSL_CTX_set_verify(srv->ssl_ctx.ctx,
	                   verify,
	                   srv->ssl_ctx.verify_host ? ssl_sock_srv_verifycbk : NULL);
	if (verify & SSL_VERIFY_PEER) {
		if (srv->ssl_ctx.ca_file) {
			/* load CAfile to verify */
			if (!SSL_CTX_load_verify_locations(srv->ssl_ctx.ctx, srv->ssl_ctx.ca_file, NULL)) {
				Alert("Proxy '%s', server '%s' [%s:%d] unable to load CA file '%s'.\n",
				      curproxy->id, srv->id,
				      srv->conf.file, srv->conf.line, srv->ssl_ctx.ca_file);
				cfgerr++;
			}
		}
		else {
			if (global.ssl_server_verify == SSL_SERVER_VERIFY_REQUIRED)
				Alert("Proxy '%s', server '%s' [%s:%d] verify is enabled by default but no CA file specified. If you're running on a LAN where you're certain to trust the server's certificate, please set an explicit 'verify none' statement on the 'server' line, or use 'ssl-server-verify none' in the global section to disable server-side verifications by default.\n",
				      curproxy->id, srv->id,
				      srv->conf.file, srv->conf.line);
			else
				Alert("Proxy '%s', server '%s' [%s:%d] verify is enabled but no CA file specified.\n",
				      curproxy->id, srv->id,
				      srv->conf.file, srv->conf.line);
			cfgerr++;
		}
#ifdef X509_V_FLAG_CRL_CHECK
		if (srv->ssl_ctx.crl_file) {
			X509_STORE *store = SSL_CTX_get_cert_store(srv->ssl_ctx.ctx);

			if (!store || !X509_STORE_load_locations(store, srv->ssl_ctx.crl_file, NULL)) {
				Alert("Proxy '%s', server '%s' [%s:%d] unable to configure CRL file '%s'.\n",
				      curproxy->id, srv->id,
				      srv->conf.file, srv->conf.line, srv->ssl_ctx.crl_file);
				cfgerr++;
			}
			else {
				X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL);
			}
		}
#endif
	}

	if (global.tune.ssllifetime)
		SSL_CTX_set_timeout(srv->ssl_ctx.ctx, global.tune.ssllifetime);

	SSL_CTX_set_session_cache_mode(srv->ssl_ctx.ctx, SSL_SESS_CACHE_OFF);
	if (srv->ssl_ctx.ciphers &&
		!SSL_CTX_set_cipher_list(srv->ssl_ctx.ctx, srv->ssl_ctx.ciphers)) {
		Alert("Proxy '%s', server '%s' [%s:%d] : unable to set SSL cipher list to '%s'.\n",
		      curproxy->id, srv->id,
		      srv->conf.file, srv->conf.line, srv->ssl_ctx.ciphers);
		cfgerr++;
	}

	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->