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291 lines
8.6 KiB
C
291 lines
8.6 KiB
C
/*++
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* NAME
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* tls_dh
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* SUMMARY
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* Diffie-Hellman parameter support
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* SYNOPSIS
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* #include <tls.h>
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* #include <tls_private.h>
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*
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* void tls_set_dh_from_file(path, bits)
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* const char *path;
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* int bits;
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*
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* int tls_set_eecdh_curve(server_ctx, grade)
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* SSL_CTX *server_ctx;
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* const char *grade;
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*
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* DH *tls_tmp_dh_cb(ssl, export, keylength)
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* SSL *ssl; acl_unused
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* int export;
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* int keylength;
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* DESCRIPTION
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* This module maintains parameters for Diffie-Hellman key generation.
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*
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* tls_tmp_dh_cb() is a call-back routine for the
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* SSL_CTX_set_tmp_dh_callback() function.
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*
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* tls_set_dh_from_file() overrides compiled-in DH parameters
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* with those specified in the named files. The file format
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* is as expected by the PEM_read_DHparams() routine. The
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* "bits" argument must be 512 or 1024.
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*
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* tls_set_eecdh_curve() enables ephemeral Elliptic-Curve DH
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* key exchange algorithms by instantiating in the server SSL
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* context a suitable curve (corresponding to the specified
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* EECDH security grade) from the set of named curves in RFC
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* 4492 Section 5.1.1. Errors generate warnings, but do not
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* disable TLS, rather we continue without EECDH. A zero
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* result indicates that the grade is invalid or the corresponding
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* curve could not be used.
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* DIAGNOSTICS
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* In case of error, tls_set_dh_from_file() logs a warning and
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* ignores the request.
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* LICENSE
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* .ad
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* .fi
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* This software is free. You can do with it whatever you want.
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* The original author kindly requests that you acknowledge
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* the use of his software.
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* AUTHOR(S)
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* Originally written by:
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* Lutz Jaenicke
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* BTU Cottbus
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* Allgemeine Elektrotechnik
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* Universitaetsplatz 3-4
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* D-03044 Cottbus, Germany
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*
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* Updated by:
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* Wietse Venema
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* IBM T.J. Watson Research
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* P.O. Box 704
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* Yorktown Heights, NY 10598, USA
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*--*/
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#include "StdAfx.h"
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#ifdef USE_TLS
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#include <stdio.h>
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/* TLS library. */
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#include "tls.h"
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#include "tls_params.h"
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#include "tls_private.h"
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/* Application-specific. */
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/*
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* Compiled-in EDH primes (the compiled-in generator is always 2). These are
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* used when no parameters are explicitly loaded from a site-specific file.
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*
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* 512-bit parameters are used for export ciphers, and 1024-bit parameters are
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* used for non-export ciphers. An ~80-bit strong EDH key exchange is really
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* too weak to protect 128+ bit keys, but larger DH primes are
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* computationally expensive. When greater security is required, use EECDH.
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*/
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/*
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* Generated via "openssl dhparam -2 -noout -C 512 2>/dev/null" TODO:
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* generate at compile-time.
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*/
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static unsigned char dh512_p[] = {
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0x88, 0x3F, 0x00, 0xAF, 0xFC, 0x0C, 0x8A, 0xB8, 0x35, 0xCD, 0xE5, 0xC2,
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0x0F, 0x55, 0xDF, 0x06, 0x3F, 0x16, 0x07, 0xBF, 0xCE, 0x13, 0x35, 0xE4,
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0x1C, 0x1E, 0x03, 0xF3, 0xAB, 0x17, 0xF6, 0x63, 0x50, 0x63, 0x67, 0x3E,
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0x10, 0xD7, 0x3E, 0xB4, 0xEB, 0x46, 0x8C, 0x40, 0x50, 0xE6, 0x91, 0xA5,
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0x6E, 0x01, 0x45, 0xDE, 0xC9, 0xB1, 0x1F, 0x64, 0x54, 0xFA, 0xD9, 0xAB,
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0x4F, 0x70, 0xBA, 0x5B,
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};
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/*
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* Generated via "openssl dhparam -2 -noout -C 1024 2>/dev/null" TODO:
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* generate at compile-time.
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*/
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static unsigned char dh1024_p[] = {
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0xB0, 0xFE, 0xB4, 0xCF, 0xD4, 0x55, 0x07, 0xE7, 0xCC, 0x88, 0x59, 0x0D,
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0x17, 0x26, 0xC5, 0x0C, 0xA5, 0x4A, 0x92, 0x23, 0x81, 0x78, 0xDA, 0x88,
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0xAA, 0x4C, 0x13, 0x06, 0xBF, 0x5D, 0x2F, 0x9E, 0xBC, 0x96, 0xB8, 0x51,
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0x00, 0x9D, 0x0C, 0x0D, 0x75, 0xAD, 0xFD, 0x3B, 0xB1, 0x7E, 0x71, 0x4F,
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0x3F, 0x91, 0x54, 0x14, 0x44, 0xB8, 0x30, 0x25, 0x1C, 0xEB, 0xDF, 0x72,
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0x9C, 0x4C, 0xF1, 0x89, 0x0D, 0x68, 0x3F, 0x94, 0x8E, 0xA4, 0xFB, 0x76,
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0x89, 0x18, 0xB2, 0x91, 0x16, 0x90, 0x01, 0x99, 0x66, 0x8C, 0x53, 0x81,
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0x4E, 0x27, 0x3D, 0x99, 0xE7, 0x5A, 0x7A, 0xAF, 0xD5, 0xEC, 0xE2, 0x7E,
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0xFA, 0xED, 0x01, 0x18, 0xC2, 0x78, 0x25, 0x59, 0x06, 0x5C, 0x39, 0xF6,
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0xCD, 0x49, 0x54, 0xAF, 0xC1, 0xB1, 0xEA, 0x4A, 0xF9, 0x53, 0xD0, 0xDF,
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0x6D, 0xAF, 0xD4, 0x93, 0xE7, 0xBA, 0xAE, 0x9B,
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};
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/*
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* Cached results.
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*/
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static __thread DH *dh_1024 = 0;
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static __thread DH *dh_512 = 0;
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/* free_dh_cb - call-back for free DH */
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static void free_dh_cb(void *arg)
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{
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DH *dh_tmp = (DH*) arg;
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DH_free(dh_tmp);
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}
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/* tls_set_dh_from_file - set Diffie-Hellman parameters from file */
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void tls_set_dh_from_file(const char *path, int bits)
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{
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const char *myname = "tls_set_dh_from_file";
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FILE *paramfile;
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DH **dhPtr = 0;
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switch (bits) {
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case 512:
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dhPtr = &dh_512;
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break;
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case 1024:
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dhPtr = &dh_1024;
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break;
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default:
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acl_msg_panic("Invalid DH parameters size %d, file %s", bits, path);
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}
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if (*dhPtr != 0)
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return;
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if ((paramfile = fopen(path, "r")) != 0) {
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if ((*dhPtr = PEM_read_DHparams(paramfile, 0, 0, 0)) == 0) {
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acl_msg_warn("%s: cannot load %d-bit DH parameters from file %s"
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" -- using compiled-in defaults", myname, bits, path);
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tls_print_errors();
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}
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(void) fclose(paramfile); /* 200411 */
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} else {
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acl_msg_warn("%s: cannot load %d-bit DH parameters from file %s: %s"
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" -- using compiled-in defaults", myname, bits, path, acl_last_serror());
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}
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}
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/* tls_get_dh - get compiled-in DH parameters */
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static DH *tls_get_dh(const unsigned char *p, int plen)
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{
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const char *myname = "tls_get_dh";
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DH *dh;
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static unsigned char g[] = {0x02,};
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/* Use the compiled-in parameters. */
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if ((dh = DH_new()) == 0) {
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acl_msg_warn("%s: cannot create DH parameter set: %s",
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myname, acl_last_serror()); /* 200411 */
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return (0);
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}
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dh->p = BN_bin2bn(p, plen, (BIGNUM *) 0);
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dh->g = BN_bin2bn(g, 1, (BIGNUM *) 0);
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if ((dh->p == 0) || (dh->g == 0)) {
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acl_msg_warn("%s: cannot load compiled-in DH parameters", myname); /* 200411 */
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DH_free(dh); /* 200411 */
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return (0);
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}
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return (dh);
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}
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/* tls_tmp_dh_cb - call-back for Diffie-Hellman parameters */
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DH *tls_tmp_dh_cb(SSL *unused_ssl acl_unused, int export, int keylength)
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{
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DH *dh_tmp;
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if (export && keylength == 512) { /* 40-bit export cipher */
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if (dh_512 == 0) {
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dh_512 = tls_get_dh(dh512_p, (int) sizeof(dh512_p));
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if (dh_512)
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acl_pthread_atexit_add(dh_512, free_dh_cb);
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}
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dh_tmp = dh_512;
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} else { /* ADH, DHE-RSA or DSA */
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if (dh_1024 == 0) {
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dh_1024 = tls_get_dh(dh1024_p, (int) sizeof(dh1024_p));
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if (dh_1024)
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acl_pthread_atexit_add(dh_1024, free_dh_cb);
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}
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dh_tmp = dh_1024;
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}
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return (dh_tmp);
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}
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int tls_set_eecdh_curve(SSL_CTX *server_ctx acl_unused, const char *grade acl_unused)
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{
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#if OPENSSL_VERSION_NUMBER >= 0x00909000 && !defined(OPENSSL_NO_ECDH)
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const char *myname = "tls_set_eecdh_curve";
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int nid;
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EC_KEY *ecdh;
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const char *curve;
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int g;
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#define TLS_EECDH_INVALID 0
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#define TLS_EECDH_NONE 1
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#define TLS_EECDH_STRONG 2
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#define TLS_EECDH_ULTRA 3
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static NAME_CODE eecdh_table[] = {
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"none", TLS_EECDH_NONE,
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"strong", TLS_EECDH_STRONG,
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"ultra", TLS_EECDH_ULTRA,
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0, TLS_EECDH_INVALID,
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};
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switch (g = name_code(eecdh_table, NAME_CODE_FLAG_NONE, grade)) {
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default:
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acl_msg_panic("%s: Invalid eecdh grade code: %d", myname, g);
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case TLS_EECDH_INVALID:
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acl_msg_warn("%s: Invalid TLS eecdh grade \"%s\": EECDH disabled", myname, grade);
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return (0);
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case TLS_EECDH_NONE:
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return (1);
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case TLS_EECDH_STRONG:
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curve = var_tls_eecdh_strong;
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break;
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case TLS_EECDH_ULTRA:
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curve = var_tls_eecdh_ultra;
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break;
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}
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/*
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* Elliptic-Curve Diffie-Hellman parameters are either "named curves"
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* from RFC 4492 section 5.1.1, or explicitly described curves over
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* binary fields. OpenSSL only supports the "named curves", which provide
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* maximum interoperability. The recommended curve for 128-bit
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* work-factor key exchange is "prime256v1" a.k.a. "secp256r1" from
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* Section 2.7 of http://www.secg.org/download/aid-386/sec2_final.pdf
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*/
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if ((nid = OBJ_sn2nid(curve)) == NID_undef) {
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acl_msg_warn("%s: unknown curve \"%s\": disabling EECDH support", myname, curve);
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return (0);
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}
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ERR_clear_error();
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if ((ecdh = EC_KEY_new_by_curve_name(nid)) == 0
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|| SSL_CTX_set_tmp_ecdh(server_ctx, ecdh) == 0) {
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acl_msg_warn("%s: unable to use curve \"%s\": disabling EECDH support", myname, curve);
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tls_print_errors();
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return (0);
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}
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#endif
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return (1);
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}
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#ifdef TEST
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int main(int unused_argc, char **unused_argv)
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{
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tls_tmp_dh_cb(0, 1, 512);
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tls_tmp_dh_cb(0, 1, 1024);
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tls_tmp_dh_cb(0, 1, 2048);
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tls_tmp_dh_cb(0, 0, 512);
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return (0);
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}
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#endif
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#endif
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