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XrdCryptosslCipher.cc
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XrdCryptosslCipher.cc
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/******************************************************************************/
/* */
/* X r d C r y p t o S s l C i p h e r . c c */
/* */
/* (c) 2004 by the Board of Trustees of the Leland Stanford, Jr., University */
/* Produced by Gerri Ganis for CERN */
/* */
/* This file is part of the XRootD software suite. */
/* */
/* XRootD is free software: you can redistribute it and/or modify it under */
/* the terms of the GNU Lesser General Public License as published by the */
/* Free Software Foundation, either version 3 of the License, or (at your */
/* option) any later version. */
/* */
/* XRootD is distributed in the hope that it will be useful, but WITHOUT */
/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */
/* License for more details. */
/* */
/* You should have received a copy of the GNU Lesser General Public License */
/* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */
/* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */
/* */
/* The copyright holder's institutional names and contributor's names may not */
/* be used to endorse or promote products derived from this software without */
/* specific prior written permission of the institution or contributor. */
/******************************************************************************/
/* ************************************************************************** */
/* */
/* OpenSSL implementation of XrdCryptoCipher */
/* */
/* ************************************************************************** */
#include <cstring>
#include <cassert>
#include "XrdSut/XrdSutRndm.hh"
#include "XrdCrypto/XrdCryptosslTrace.hh"
#include "XrdCrypto/openssl3/XrdCryptosslCipher.hh"
//#include <openssl/dsa.h>
#include <openssl/bio.h>
#include <openssl/pem.h>
#include <openssl/dh.h>
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
#include <openssl/core_names.h>
#include <openssl/param_build.h>
#endif
// ---------------------------------------------------------------------------//
//
// Cipher interface
//
// ---------------------------------------------------------------------------//
#if OPENSSL_VERSION_NUMBER < 0x10100000L
static DH *EVP_PKEY_get0_DH(EVP_PKEY *pkey)
{
if (pkey->type != EVP_PKEY_DH) {
return NULL;
}
return pkey->pkey.dh;
}
static void DH_get0_pqg(const DH *dh,
const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
{
if (p != NULL)
*p = dh->p;
if (q != NULL)
*q = dh->q;
if (g != NULL)
*g = dh->g;
}
static int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
{
/* If the fields p and g in d are NULL, the corresponding input
* parameters MUST be non-NULL. q may remain NULL.
*/
if ((dh->p == NULL && p == NULL) || (dh->g == NULL && g == NULL))
return 0;
if (p != NULL) {
BN_free(dh->p);
dh->p = p;
}
if (q != NULL) {
BN_free(dh->q);
dh->q = q;
}
if (g != NULL) {
BN_free(dh->g);
dh->g = g;
}
if (q != NULL) {
dh->length = BN_num_bits(q);
}
return 1;
}
static void DH_get0_key(const DH *dh,
const BIGNUM **pub_key, const BIGNUM **priv_key)
{
if (pub_key != NULL)
*pub_key = dh->pub_key;
if (priv_key != NULL)
*priv_key = dh->priv_key;
}
static int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
{
/* If the field pub_key in dh is NULL, the corresponding input
* parameters MUST be non-NULL. The priv_key field may
* be left NULL.
*/
if (dh->pub_key == NULL && pub_key == NULL)
return 0;
if (pub_key != NULL) {
BN_free(dh->pub_key);
dh->pub_key = pub_key;
}
if (priv_key != NULL) {
BN_free(dh->priv_key);
dh->priv_key = priv_key;
}
return 1;
}
static int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)
{
/* If the field pub_key in d is NULL, the corresponding input
* parameters MUST be non-NULL. The priv_key field may
* be left NULL.
*/
if (d->pub_key == NULL && pub_key == NULL)
return 0;
if (pub_key != NULL) {
BN_free(d->pub_key);
d->pub_key = pub_key;
}
if (priv_key != NULL) {
BN_free(d->priv_key);
d->priv_key = priv_key;
}
return 1;
}
#endif
static int XrdCheckDH (EVP_PKEY *pkey) {
int rc;
#if OPENSSL_VERSION_NUMBER < 0x10101000L
DH *dh = EVP_PKEY_get0_DH(pkey);
if (dh) {
DH_check(dh, &rc);
rc = (rc == 0 ? 1 : 0);
}
else {
rc = -2;
}
#else
EVP_PKEY_CTX *ckctx = EVP_PKEY_CTX_new(pkey, 0);
rc = EVP_PKEY_param_check(ckctx);
EVP_PKEY_CTX_free(ckctx);
#endif
return rc;
}
//_____________________________________________________________________________
bool XrdCryptosslCipher::IsSupported(const char *cip)
{
// Check if the specified cipher is supported
return (EVP_get_cipherbyname(cip) != 0);
}
//____________________________________________________________________________
XrdCryptosslCipher::XrdCryptosslCipher(const char *t, int l)
{
// Main Constructor
// Complete initialization of a cipher of type t and length l
// The initialization vector is also created
// Used to create ciphers
valid = 0;
ctx = 0;
fIV = 0;
lIV = 0;
cipher = 0;
fDH = 0;
deflength = 1;
// Check and set type
char cipnam[64] = {"bf-cbc"};
if (t && strcmp(t,"default")) {
strcpy(cipnam,t);
cipnam[63] = 0;
}
cipher = EVP_get_cipherbyname(cipnam);
if (cipher) {
// Determine key length
l = (l > EVP_MAX_KEY_LENGTH) ? EVP_MAX_KEY_LENGTH : l;
int ldef = EVP_CIPHER_key_length(cipher);
int lgen = (l > ldef) ? l : ldef;
// Generate and set a new key
char *ktmp = XrdSutRndm::GetBuffer(lgen);
if (ktmp) {
// Init context
ctx = EVP_CIPHER_CTX_new();
if (ctx) {
valid = 1;
// Try setting the key length
if (l && l != ldef) {
EVP_CipherInit_ex(ctx, cipher, 0, 0, 0, 1);
EVP_CIPHER_CTX_set_key_length(ctx,l);
EVP_CipherInit_ex(ctx, 0, 0, (unsigned char *)ktmp, 0, 1);
if (l == EVP_CIPHER_CTX_key_length(ctx)) {
// Use the l bytes at ktmp
SetBuffer(l,ktmp);
deflength = 0;
}
}
if (!Length()) {
EVP_CipherInit_ex(ctx, cipher, 0, (unsigned char *)ktmp, 0, 1);
SetBuffer(ldef,ktmp);
}
// Set also the type
SetType(cipnam);
}
// Cleanup
delete[] ktmp;
}
}
// Finally, generate and set a new IV
if (valid)
GenerateIV();
}
//____________________________________________________________________________
XrdCryptosslCipher::XrdCryptosslCipher(const char *t, int l,
const char *k, int liv, const char *iv)
{
// Constructor.
// Initialize a cipher of type t and length l using the key at k and
// the initialization vector at iv.
// Used to import ciphers.
valid = 0;
ctx = 0;
fIV = 0;
lIV = 0;
fDH = 0;
cipher = 0;
deflength = 1;
// Check and set type
char cipnam[64] = {"bf-cbc"};
if (t && strcmp(t,"default")) {
strcpy(cipnam,t);
cipnam[63] = 0;
}
cipher = EVP_get_cipherbyname(cipnam);
if (cipher) {
// Init context
ctx = EVP_CIPHER_CTX_new();
if (ctx) {
// Set the key
SetBuffer(l,k);
if (l != EVP_CIPHER_key_length(cipher))
deflength = 0;
// Set also the type
SetType(cipnam);
// Set validity flag
valid = 1;
}
}
//
// Init cipher
if (valid) {
//
// Set the IV
SetIV(liv,iv);
if (deflength) {
EVP_CipherInit_ex(ctx, cipher, 0, (unsigned char *)Buffer(), 0, 1);
} else {
EVP_CipherInit_ex(ctx, cipher, 0, 0, 0, 1);
EVP_CIPHER_CTX_set_key_length(ctx,Length());
EVP_CipherInit_ex(ctx, 0, 0, (unsigned char *)Buffer(), 0, 1);
}
}
}
//____________________________________________________________________________
XrdCryptosslCipher::XrdCryptosslCipher(XrdSutBucket *bck)
{
// Constructor from bucket.
// Initialize a cipher of type t and length l using the key at k
// Used to import ciphers.
valid = 0;
ctx = 0;
fIV = 0;
lIV = 0;
fDH = 0;
cipher = 0;
deflength = 1;
if (bck && bck->size > 0) {
valid = 1;
kXR_int32 ltyp = 0;
kXR_int32 livc = 0;
kXR_int32 lbuf = 0;
kXR_int32 lp = 0;
kXR_int32 lg = 0;
kXR_int32 lpub = 0;
kXR_int32 lpri = 0;
char *bp = bck->buffer;
int cur = 0;
memcpy(<yp,bp+cur,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(&livc,bp+cur,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(&lbuf,bp+cur,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(&lp,bp+cur,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(&lg,bp+cur,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(&lpub,bp+cur,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
memcpy(&lpri,bp+cur,sizeof(kXR_int32));
cur += sizeof(kXR_int32);
// Type
if (ltyp) {
char *buf = new char[ltyp+1];
if (buf) {
memcpy(buf,bp+cur,ltyp);
buf[ltyp] = 0;
cipher = EVP_get_cipherbyname(buf);
if (!cipher)
cipher = EVP_get_cipherbyname("bf-cbc");
if (cipher) {
// Set the type
SetType(buf);
} else {
valid = 0;
}
delete[] buf;
} else
valid = 0;
cur += ltyp;
}
// IV
if (livc) {
char *buf = new char[livc];
if (buf) {
memcpy(buf,bp+cur,livc);
cur += livc;
// Set the IV
SetIV(livc,buf);
delete[] buf;
} else
valid = 0;
cur += livc;
}
// buffer
if (lbuf) {
char *buf = new char[lbuf];
if (buf) {
memcpy(buf,bp+cur,lbuf);
// Set the buffer
UseBuffer(lbuf,buf);
if (cipher && lbuf != EVP_CIPHER_key_length(cipher))
deflength = 0;
} else
valid = 0;
cur += lbuf;
}
// DH, if any
if (lp > 0 || lg > 0 || lpub > 0 || lpri > 0) {
char *buf = 0;
BIGNUM *p = NULL, *g = NULL;
BIGNUM *pub = NULL, *pri = NULL;
// p
if (lp > 0) {
buf = new char[lp+1];
if (buf) {
memcpy(buf,bp+cur,lp);
buf[lp] = 0;
BN_hex2bn(&p,buf);
delete[] buf;
} else
valid = 0;
cur += lp;
}
// g
if (lg > 0) {
buf = new char[lg+1];
if (buf) {
memcpy(buf,bp+cur,lg);
buf[lg] = 0;
BN_hex2bn(&g,buf);
delete[] buf;
} else
valid = 0;
cur += lg;
}
// pub_key
if (lpub > 0) {
buf = new char[lpub+1];
if (buf) {
memcpy(buf,bp+cur,lpub);
buf[lpub] = 0;
BN_hex2bn(&pub,buf);
delete[] buf;
} else
valid = 0;
cur += lpub;
}
// priv_key
if (lpri > 0) {
buf = new char[lpri+1];
if (buf) {
memcpy(buf,bp+cur,lpri);
buf[lpri] = 0;
BN_hex2bn(&pri,buf);
delete[] buf;
} else
valid = 0;
cur += lpri;
}
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
OSSL_PARAM_BLD *bld = OSSL_PARAM_BLD_new();
if (p) OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_FFC_P, p);
if (g) OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_FFC_G, g);
if (pub) OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_PUB_KEY, pub);
if (pri) OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_PRIV_KEY, pri);
OSSL_PARAM *params = OSSL_PARAM_BLD_to_param(bld);
OSSL_PARAM_BLD_free(bld);
if (p) BN_free(p);
if (g) BN_free(g);
if (pub) BN_free(pub);
if (pri) BN_free(pri);
EVP_PKEY_CTX *pkctx = EVP_PKEY_CTX_new_id(EVP_PKEY_DH, 0);
EVP_PKEY_fromdata_init(pkctx);
EVP_PKEY_fromdata(pkctx, &fDH, EVP_PKEY_KEYPAIR, params);
EVP_PKEY_CTX_free(pkctx);
OSSL_PARAM_free(params);
#else
DH* dh = DH_new();
DH_set0_pqg(dh, p, NULL, g);
DH_set0_key(dh, pub, pri);
fDH = EVP_PKEY_new();
EVP_PKEY_assign_DH(fDH, dh);
#endif
if (XrdCheckDH(fDH) != 1)
valid = 0;
}
}
//
// Init cipher
if (valid) {
// Init context
ctx = EVP_CIPHER_CTX_new();
if (ctx) {
if (deflength) {
EVP_CipherInit_ex(ctx, cipher, 0, (unsigned char *)Buffer(), 0, 1);
} else {
EVP_CipherInit_ex(ctx, cipher, 0, 0, 0, 1);
EVP_CIPHER_CTX_set_key_length(ctx,Length());
EVP_CipherInit_ex(ctx, 0, 0, (unsigned char *)Buffer(), 0, 1);
}
} else
valid = 0;
}
if (!valid) {
Cleanup();
}
}
//____________________________________________________________________________
XrdCryptosslCipher::XrdCryptosslCipher(bool padded, int bits, char *pub,
int lpub, const char *t)
{
// Constructor for key agreement.
// If pub is not defined, generates a DH full key,
// the public part and parameters can be retrieved using Public().
// 'bits' is ignored (DH key is generated once)
// If pub is defined with the public part and parameters of the
// counterpart fully initialize a cipher with that information.
// Sets also the name to 't', if different from the default one.
// Used for key agreement.
EPNAME("sslCipher::XrdCryptosslCipher");
valid = 0;
ctx = 0;
fIV = 0;
lIV = 0;
fDH = 0;
cipher = 0;
deflength = 1;
if (!pub) {
static EVP_PKEY *dhparms = [] {
DEBUG("generate DH parameters");
EVP_PKEY *dhParam = 0;
EVP_PKEY_CTX *pkctx = EVP_PKEY_CTX_new_id(EVP_PKEY_DH, 0);
EVP_PKEY_paramgen_init(pkctx);
EVP_PKEY_CTX_set_dh_paramgen_prime_len(pkctx, kDHMINBITS);
EVP_PKEY_CTX_set_dh_paramgen_generator(pkctx, 5);
EVP_PKEY_paramgen(pkctx, &dhParam);
EVP_PKEY_CTX_free(pkctx);
DEBUG("generate DH parameters done");
return dhParam;
}();
DEBUG("configure DH parameters");
//
// Set params for DH object
assert(dhparms);
EVP_PKEY_CTX *pkctx = EVP_PKEY_CTX_new(dhparms, 0);
EVP_PKEY_keygen_init(pkctx);
EVP_PKEY_keygen(pkctx, &fDH);
EVP_PKEY_CTX_free(pkctx);
if (fDH) {
// Init context
ctx = EVP_CIPHER_CTX_new();
if (ctx)
valid = 1;
}
} else {
DEBUG("initialize cipher from key-agreement buffer");
//
char *ktmp = 0;
size_t ltmp = 0;
// Extract string with bignumber
BIGNUM *bnpub = 0;
char *pb = strstr(pub,"---BPUB---");
char *pe = strstr(pub,"---EPUB--"); // one less (pub not null-terminated)
if (pb && pe) {
lpub = (int)(pb-pub);
pb += 10;
*pe = 0;
BN_hex2bn(&bnpub, pb);
*pe = '-';
}
if (bnpub) {
//
// Prepare to decode the input buffer
BIO *biop = BIO_new(BIO_s_mem());
if (biop) {
//
// Write buffer into BIO
BIO_write(biop,pub,lpub);
//
// Read params from BIO
EVP_PKEY *dhParam = 0;
PEM_read_bio_Parameters(biop, &dhParam);
if (dhParam) {
if (XrdCheckDH(dhParam) == 1) {
//
// generate DH key
EVP_PKEY_CTX *pkctx = EVP_PKEY_CTX_new(dhParam, 0);
EVP_PKEY_keygen_init(pkctx);
EVP_PKEY_keygen(pkctx, &fDH);
EVP_PKEY_CTX_free(pkctx);
if (fDH) {
// Now we can compute the cipher
ltmp = EVP_PKEY_size(fDH);
ktmp = new char[ltmp];
memset(ktmp, 0, ltmp);
if (ktmp) {
// Create peer public key
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
EVP_PKEY *peer = 0;
OSSL_PARAM *params1 = 0;
EVP_PKEY_todata( dhParam, EVP_PKEY_KEY_PARAMETERS, ¶ms1 );
OSSL_PARAM_BLD *bld = OSSL_PARAM_BLD_new();
OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_PUB_KEY, bnpub);
OSSL_PARAM *params2 = OSSL_PARAM_BLD_to_param(bld);
OSSL_PARAM_BLD_free(bld);
OSSL_PARAM *params = OSSL_PARAM_merge( params1, params2 );
pkctx = EVP_PKEY_CTX_new_id(EVP_PKEY_DH, 0);
EVP_PKEY_fromdata_init(pkctx);
EVP_PKEY_fromdata(pkctx, &peer, EVP_PKEY_KEYPAIR, params);
EVP_PKEY_CTX_free(pkctx);
OSSL_PARAM_free(params);
OSSL_PARAM_free(params1);
OSSL_PARAM_free(params2);
#else
DH* dh = DH_new();
DH_set0_key(dh, BN_dup(bnpub), NULL);
EVP_PKEY *peer = EVP_PKEY_new();
EVP_PKEY_assign_DH(peer, dh);
#endif
// Derive shared secret
pkctx = EVP_PKEY_CTX_new(fDH, 0);
EVP_PKEY_derive_init(pkctx);
#if OPENSSL_VERSION_NUMBER >= 0x10101000L
EVP_PKEY_CTX_set_dh_pad(pkctx, padded);
#endif
EVP_PKEY_derive_set_peer(pkctx, peer);
EVP_PKEY_derive(pkctx, (unsigned char *)ktmp, <mp);
EVP_PKEY_CTX_free(pkctx);
EVP_PKEY_free(peer);
if (ltmp > 0) {
#if OPENSSL_VERSION_NUMBER < 0x10101000L
if (padded) {
int pad = EVP_PKEY_size(fDH) - ltmp;
if (pad > 0) {
memmove(ktmp + pad, ktmp, ltmp);
memset(ktmp, 0, pad);
ltmp += pad;
}
}
#endif
valid = 1;
}
}
}
}
EVP_PKEY_free(dhParam);
}
BIO_free(biop);
}
BN_free( bnpub );
}
//
// If a valid key has been computed, set the cipher
if (valid) {
// Init context
ctx = EVP_CIPHER_CTX_new();
if (ctx) {
// Check and set type
char cipnam[64] = {"bf-cbc"};
if (t && strcmp(t,"default")) {
strcpy(cipnam,t);
cipnam[63] = 0;
}
if ((cipher = EVP_get_cipherbyname(cipnam))) {
// At most EVP_MAX_KEY_LENGTH bytes
ltmp = (ltmp > EVP_MAX_KEY_LENGTH) ? EVP_MAX_KEY_LENGTH : ltmp;
int ldef = EVP_CIPHER_key_length(cipher);
// Try setting the key length
if ((int)ltmp != ldef) {
EVP_CipherInit_ex(ctx, cipher, 0, 0, 0, 1);
EVP_CIPHER_CTX_set_key_length(ctx,ltmp);
EVP_CipherInit_ex(ctx, 0, 0, (unsigned char *)ktmp, 0, 1);
if ((int)ltmp == EVP_CIPHER_CTX_key_length(ctx)) {
// Use the ltmp bytes at ktmp
SetBuffer(ltmp,ktmp);
deflength = 0;
}
}
if (!Length()) {
EVP_CipherInit_ex(ctx, cipher, 0, (unsigned char *)ktmp, 0, 1);
SetBuffer(ldef,ktmp);
}
// Set also the type
SetType(cipnam);
}
} else
valid = 0;
}
// Cleanup
if (ktmp) {delete[] ktmp; ktmp = 0;}
}
// Cleanup, if invalid
if (!valid)
Cleanup();
}
//____________________________________________________________________________
XrdCryptosslCipher::XrdCryptosslCipher(const XrdCryptosslCipher &c)
: XrdCryptoCipher()
{
// Copy Constructor
// Basics
deflength = c.deflength;
valid = c.valid;
ctx = 0;
// IV
lIV = 0;
fIV = 0;
SetIV(c.lIV,c.fIV);
// Cipher
cipher = c.cipher;
// Set the key
SetBuffer(c.Length(),c.Buffer());
// Set also the type
SetType(c.Type());
// DH
fDH = 0;
if (valid && c.fDH) {
valid = 0;
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
BIGNUM *p = BN_new();
BIGNUM *g = BN_new();
BIGNUM *pub = BN_new();
BIGNUM *pri = BN_new();
OSSL_PARAM_BLD *bld = OSSL_PARAM_BLD_new();
if (EVP_PKEY_get_bn_param(c.fDH, OSSL_PKEY_PARAM_FFC_P, &p) == 1)
OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_FFC_P, p);
if (EVP_PKEY_get_bn_param(c.fDH, OSSL_PKEY_PARAM_FFC_G, &g) == 1)
OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_FFC_G, g);
if (EVP_PKEY_get_bn_param(c.fDH, OSSL_PKEY_PARAM_PUB_KEY, &pub) == 1)
OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_PUB_KEY, pub);
if (EVP_PKEY_get_bn_param(c.fDH, OSSL_PKEY_PARAM_PRIV_KEY, &pri) == 1)
OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_PRIV_KEY, pri);
OSSL_PARAM *params = OSSL_PARAM_BLD_to_param(bld);
OSSL_PARAM_BLD_free(bld);
BN_free(p);
BN_free(g);
BN_free(pub);
BN_free(pri);
EVP_PKEY_CTX *pkctx = EVP_PKEY_CTX_new_id(EVP_PKEY_DH, 0);
EVP_PKEY_fromdata_init(pkctx);
EVP_PKEY_fromdata(pkctx, &fDH, EVP_PKEY_KEYPAIR, params);
EVP_PKEY_CTX_free(pkctx);
OSSL_PARAM_free(params);
#else
DH* dh = DH_new();
if (dh) {
const BIGNUM *p, *g;
DH_get0_pqg(EVP_PKEY_get0_DH(c.fDH), &p, NULL, &g);
DH_set0_pqg(dh, p ? BN_dup(p) : NULL, NULL, g ? BN_dup(g) : NULL);
const BIGNUM *pub, *pri;
DH_get0_key(EVP_PKEY_get0_DH(c.fDH), &pub, &pri);
DH_set0_key(dh, pub ? BN_dup(pub) : NULL, pri ? BN_dup(pri) : NULL);
fDH = EVP_PKEY_new();
EVP_PKEY_assign_DH(fDH, dh);
}
#endif
if (fDH) {
if (XrdCheckDH(fDH) == 1)
valid = 1;
}
}
if (valid) {
// Init context
ctx = EVP_CIPHER_CTX_new();
if (!ctx)
valid = 0;
}
if (!valid) {
Cleanup();
}
}
//____________________________________________________________________________
XrdCryptosslCipher::~XrdCryptosslCipher()
{
// Destructor.
// Cleanup IV
if (fIV)
delete[] fIV;
// Cleanups
if (valid)
EVP_CIPHER_CTX_free(ctx);
Cleanup();
}
//____________________________________________________________________________
void XrdCryptosslCipher::Cleanup()
{
// Cleanup temporary memory
// Cleanup IV
if (fDH) {
EVP_PKEY_free(fDH);
fDH = 0;
}
}
//____________________________________________________________________________
bool XrdCryptosslCipher::Finalize(bool padded,
char *pub, int /*lpub*/, const char *t)
{
// Finalize cipher during key agreement. Should be called
// for a cipher build with special constructor defining member fDH.
// The buffer pub should contain the public part of the counterpart.
// Sets also the name to 't', if different from the default one.
// Used for key agreement.
EPNAME("sslCipher::Finalize");
if (!fDH) {
DEBUG("DH undefined: this cipher cannot be finalized"
" by this method");
return 0;
}
char *ktmp = 0;
size_t ltmp = 0;
valid = 0;
if (pub) {
//
// Extract string with bignumber
BIGNUM *bnpub = 0;
char *pb = strstr(pub,"---BPUB---");
char *pe = strstr(pub,"---EPUB--");
if (pb && pe) {
//lpub = (int)(pb-pub);
pb += 10;
*pe = 0;
BN_hex2bn(&bnpub, pb);
*pe = '-';
}
if (bnpub) {
// Now we can compute the cipher
ktmp = new char[EVP_PKEY_size(fDH)];
memset(ktmp, 0, EVP_PKEY_size(fDH));
if (ktmp) {
// Create peer public key
EVP_PKEY_CTX *pkctx;
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
EVP_PKEY *peer = 0;
OSSL_PARAM_BLD *bld = OSSL_PARAM_BLD_new();
OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_PUB_KEY, bnpub);
OSSL_PARAM *params = OSSL_PARAM_BLD_to_param(bld);
OSSL_PARAM_BLD_free(bld);
pkctx = EVP_PKEY_CTX_new_id(EVP_PKEY_DH, 0);
EVP_PKEY_fromdata_init(pkctx);
EVP_PKEY_fromdata(pkctx, &peer, EVP_PKEY_PUBLIC_KEY, params);
EVP_PKEY_CTX_free(pkctx);
OSSL_PARAM_free(params);
#else
DH* dh = DH_new();
DH_set0_key(dh, BN_dup(bnpub), NULL);
EVP_PKEY *peer = EVP_PKEY_new();
EVP_PKEY_assign_DH(peer, dh);
#endif
// Derive shared secret
pkctx = EVP_PKEY_CTX_new(fDH, 0);
EVP_PKEY_derive_init(pkctx);
#if OPENSSL_VERSION_NUMBER >= 0x10101000L
EVP_PKEY_CTX_set_dh_pad(pkctx, padded);
#endif
EVP_PKEY_derive_set_peer(pkctx, peer);
EVP_PKEY_derive(pkctx, (unsigned char *)ktmp, <mp);
EVP_PKEY_CTX_free(pkctx);
if (ltmp > 0) {
#if OPENSSL_VERSION_NUMBER < 0x10101000L
if (padded) {
int pad = EVP_PKEY_size(fDH) - ltmp;
if (pad > 0) {
memmove(ktmp + pad, ktmp, ltmp);
memset(ktmp, 0, pad);
ltmp += pad;
}
}
#endif
valid = 1;
}
}
BN_free(bnpub);
bnpub=0;
}
//
// If a valid key has been computed, set the cipher
if (valid) {
// Check and set type
char cipnam[64] = {"bf-cbc"};
if (t && strcmp(t,"default")) {
strcpy(cipnam,t);
cipnam[63] = 0;
}
if ((cipher = EVP_get_cipherbyname(cipnam))) {
// At most EVP_MAX_KEY_LENGTH bytes
ltmp = (ltmp > EVP_MAX_KEY_LENGTH) ? EVP_MAX_KEY_LENGTH : ltmp;
int ldef = EVP_CIPHER_key_length(cipher);
// Try setting the key length
if ((int)ltmp != ldef) {
EVP_CipherInit_ex(ctx, cipher, 0, 0, 0, 1);
EVP_CIPHER_CTX_set_key_length(ctx,ltmp);
EVP_CipherInit_ex(ctx, 0, 0, (unsigned char *)ktmp, 0, 1);
if ((int)ltmp == EVP_CIPHER_CTX_key_length(ctx)) {
// Use the ltmp bytes at ktmp
SetBuffer(ltmp,ktmp);
deflength = 0;
}
}
if (!Length()) {
EVP_CipherInit_ex(ctx, cipher, 0, (unsigned char *)ktmp, 0, 1);
SetBuffer(ldef,ktmp);
}
// Set also the type
SetType(cipnam);
}
}
// Cleanup
if (ktmp) {delete[] ktmp; ktmp = 0;}
}
// Cleanup, if invalid
if (!valid) {
EVP_CIPHER_CTX_free(ctx);
Cleanup();
}
// We are done
return valid;
}
//_____________________________________________________________________________
int XrdCryptosslCipher::Publen()
{
// Minimum length of export format of public key
static int lhdr = strlen("-----BEGIN DH PARAMETERS-----"
"-----END DH PARAMETERS-----") + 3;
if (fDH) {
// minimum length of the core is 22 bytes
int l = 2 * EVP_PKEY_size(fDH);
if (l < 22) l = 22;
// for headers
l += lhdr;
// some margin
return (l+20);
} else
return 0;
}
//_____________________________________________________________________________
char *XrdCryptosslCipher::Public(int &lpub)
{
// Return buffer with the public part of the DH key and the shared
// parameters; lpub contains the length of the meaningful bytes.
// Buffer should be deleted by the caller.
static int lhend = strlen("-----END DH PARAMETERS-----");
if (fDH) {
//
// Calculate and write public key hex
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
BIGNUM *pub = BN_new();
EVP_PKEY_get_bn_param(fDH, OSSL_PKEY_PARAM_PUB_KEY, &pub);
char *phex = BN_bn2hex(pub);
BN_free(pub);
#else
const BIGNUM *pub;
DH_get0_key(EVP_PKEY_get0_DH(fDH), &pub, NULL);
char *phex = BN_bn2hex(pub);
#endif
int lhex = strlen(phex);
//
// Prepare bio to export info buffer
BIO *biop = BIO_new(BIO_s_mem());
if (biop) {
int ltmp = Publen() + lhex + 20;
char *pub = new char[ltmp];
if (pub) {
// Write parms first
PEM_write_bio_Parameters(biop, fDH);
// Read key from BIO to buf
BIO_read(biop,(void *)pub,ltmp);
BIO_free(biop);
// Add public key
char *p = strstr(pub,"-----END DH PARAMETERS-----");
// Buffer length up to now
lpub = (int)(p - pub) + lhend + 1;
if (phex && p) {
// position at the end
p += (lhend+1);
// Begin of public key hex
memcpy(p,"---BPUB---",10);
p += 10;
// Calculate and write public key hex
memcpy(p,phex,lhex);
OPENSSL_free(phex);
// End of public key hex
p += lhex;
memcpy(p,"---EPUB---",10);
// Calculate total length
lpub += (20 + lhex);
} else {
if (phex) OPENSSL_free(phex);
}
// return
return pub;
}
} else {
if (phex) OPENSSL_free(phex);
}
}
lpub = 0;
return (char *)0;
}
//_____________________________________________________________________________
void XrdCryptosslCipher::PrintPublic(BIGNUM *pub)
{