/
openssl.c
3290 lines (2710 loc) · 87.8 KB
/
openssl.c
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/* Copyright (C) 2009, 2010 Simon Josefsson
* Copyright (C) 2006, 2007 The Written Word, Inc. All rights reserved.
* Copyright (c) 2004-2006, Sara Golemon <sarag@libssh2.org>
*
* Author: Simon Josefsson
*
* Redistribution and use in source and binary forms,
* with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* Neither the name of the copyright holder nor the names
* of any other contributors may be used to endorse or
* promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#include "libssh2_priv.h"
#ifdef LIBSSH2_OPENSSL /* compile only if we build with openssl */
#include <string.h>
#include "misc.h"
#ifndef EVP_MAX_BLOCK_LENGTH
#define EVP_MAX_BLOCK_LENGTH 32
#endif
int
read_openssh_private_key_from_memory(void **key_ctx, LIBSSH2_SESSION *session,
const char *key_type,
const char *filedata,
size_t filedata_len,
unsigned const char *passphrase);
static unsigned char *
write_bn(unsigned char *buf, const BIGNUM *bn, int bn_bytes)
{
unsigned char *p = buf;
/* Left space for bn size which will be written below. */
p += 4;
*p = 0;
BN_bn2bin(bn, p + 1);
if(!(*(p + 1) & 0x80)) {
memmove(p, p + 1, --bn_bytes);
}
_libssh2_htonu32(p - 4, bn_bytes); /* Post write bn size. */
return p + bn_bytes;
}
int
_libssh2_rsa_new(libssh2_rsa_ctx ** rsa,
const unsigned char *edata,
unsigned long elen,
const unsigned char *ndata,
unsigned long nlen,
const unsigned char *ddata,
unsigned long dlen,
const unsigned char *pdata,
unsigned long plen,
const unsigned char *qdata,
unsigned long qlen,
const unsigned char *e1data,
unsigned long e1len,
const unsigned char *e2data,
unsigned long e2len,
const unsigned char *coeffdata, unsigned long coefflen)
{
BIGNUM * e;
BIGNUM * n;
BIGNUM * d = 0;
BIGNUM * p = 0;
BIGNUM * q = 0;
BIGNUM * dmp1 = 0;
BIGNUM * dmq1 = 0;
BIGNUM * iqmp = 0;
e = BN_new();
BN_bin2bn(edata, elen, e);
n = BN_new();
BN_bin2bn(ndata, nlen, n);
if(ddata) {
d = BN_new();
BN_bin2bn(ddata, dlen, d);
p = BN_new();
BN_bin2bn(pdata, plen, p);
q = BN_new();
BN_bin2bn(qdata, qlen, q);
dmp1 = BN_new();
BN_bin2bn(e1data, e1len, dmp1);
dmq1 = BN_new();
BN_bin2bn(e2data, e2len, dmq1);
iqmp = BN_new();
BN_bin2bn(coeffdata, coefflen, iqmp);
}
*rsa = RSA_new();
#ifdef HAVE_OPAQUE_STRUCTS
RSA_set0_key(*rsa, n, e, d);
#else
(*rsa)->e = e;
(*rsa)->n = n;
(*rsa)->d = d;
#endif
#ifdef HAVE_OPAQUE_STRUCTS
RSA_set0_factors(*rsa, p, q);
#else
(*rsa)->p = p;
(*rsa)->q = q;
#endif
#ifdef HAVE_OPAQUE_STRUCTS
RSA_set0_crt_params(*rsa, dmp1, dmq1, iqmp);
#else
(*rsa)->dmp1 = dmp1;
(*rsa)->dmq1 = dmq1;
(*rsa)->iqmp = iqmp;
#endif
return 0;
}
int
_libssh2_rsa_sha1_verify(libssh2_rsa_ctx * rsactx,
const unsigned char *sig,
unsigned long sig_len,
const unsigned char *m, unsigned long m_len)
{
unsigned char hash[SHA_DIGEST_LENGTH];
int ret;
if(_libssh2_sha1(m, m_len, hash))
return -1; /* failure */
ret = RSA_verify(NID_sha1, hash, SHA_DIGEST_LENGTH,
(unsigned char *) sig, sig_len, rsactx);
return (ret == 1) ? 0 : -1;
}
#if LIBSSH2_DSA
int
_libssh2_dsa_new(libssh2_dsa_ctx ** dsactx,
const unsigned char *p,
unsigned long p_len,
const unsigned char *q,
unsigned long q_len,
const unsigned char *g,
unsigned long g_len,
const unsigned char *y,
unsigned long y_len,
const unsigned char *x, unsigned long x_len)
{
BIGNUM * p_bn;
BIGNUM * q_bn;
BIGNUM * g_bn;
BIGNUM * pub_key;
BIGNUM * priv_key = NULL;
p_bn = BN_new();
BN_bin2bn(p, p_len, p_bn);
q_bn = BN_new();
BN_bin2bn(q, q_len, q_bn);
g_bn = BN_new();
BN_bin2bn(g, g_len, g_bn);
pub_key = BN_new();
BN_bin2bn(y, y_len, pub_key);
if(x_len) {
priv_key = BN_new();
BN_bin2bn(x, x_len, priv_key);
}
*dsactx = DSA_new();
#ifdef HAVE_OPAQUE_STRUCTS
DSA_set0_pqg(*dsactx, p_bn, q_bn, g_bn);
#else
(*dsactx)->p = p_bn;
(*dsactx)->g = g_bn;
(*dsactx)->q = q_bn;
#endif
#ifdef HAVE_OPAQUE_STRUCTS
DSA_set0_key(*dsactx, pub_key, priv_key);
#else
(*dsactx)->pub_key = pub_key;
(*dsactx)->priv_key = priv_key;
#endif
return 0;
}
int
_libssh2_dsa_sha1_verify(libssh2_dsa_ctx * dsactx,
const unsigned char *sig,
const unsigned char *m, unsigned long m_len)
{
unsigned char hash[SHA_DIGEST_LENGTH];
DSA_SIG * dsasig;
BIGNUM * r;
BIGNUM * s;
int ret = -1;
r = BN_new();
BN_bin2bn(sig, 20, r);
s = BN_new();
BN_bin2bn(sig + 20, 20, s);
dsasig = DSA_SIG_new();
#ifdef HAVE_OPAQUE_STRUCTS
DSA_SIG_set0(dsasig, r, s);
#else
dsasig->r = r;
dsasig->s = s;
#endif
if(!_libssh2_sha1(m, m_len, hash))
/* _libssh2_sha1() succeeded */
ret = DSA_do_verify(hash, SHA_DIGEST_LENGTH, dsasig, dsactx);
DSA_SIG_free(dsasig);
return (ret == 1) ? 0 : -1;
}
#endif /* LIBSSH_DSA */
#if LIBSSH2_ECDSA
/* _libssh2_ecdsa_get_curve_type
*
* returns key curve type that maps to libssh2_curve_type
*
*/
libssh2_curve_type
_libssh2_ecdsa_get_curve_type(libssh2_ecdsa_ctx *ec_ctx)
{
const EC_GROUP *group = EC_KEY_get0_group(ec_ctx);
return EC_GROUP_get_curve_name(group);
}
/* _libssh2_ecdsa_curve_type_from_name
*
* returns 0 for success, key curve type that maps to libssh2_curve_type
*
*/
int
_libssh2_ecdsa_curve_type_from_name(const char *name,
libssh2_curve_type *out_type)
{
int ret = 0;
libssh2_curve_type type;
if(name == NULL || strlen(name) != 19)
return -1;
if(strcmp(name, "ecdsa-sha2-nistp256") == 0)
type = LIBSSH2_EC_CURVE_NISTP256;
else if(strcmp(name, "ecdsa-sha2-nistp384") == 0)
type = LIBSSH2_EC_CURVE_NISTP384;
else if(strcmp(name, "ecdsa-sha2-nistp521") == 0)
type = LIBSSH2_EC_CURVE_NISTP521;
else {
ret = -1;
}
if(ret == 0 && out_type) {
*out_type = type;
}
return ret;
}
/* _libssh2_ecdsa_curve_name_with_octal_new
*
* Creates a new public key given an octal string, length and type
*
*/
int
_libssh2_ecdsa_curve_name_with_octal_new(libssh2_ecdsa_ctx ** ec_ctx,
const unsigned char *k,
size_t k_len, libssh2_curve_type curve)
{
int ret = 0;
const EC_GROUP *ec_group = NULL;
EC_KEY *ec_key = EC_KEY_new_by_curve_name(curve);
EC_POINT *point = NULL;
if(ec_key) {
ec_group = EC_KEY_get0_group(ec_key);
point = EC_POINT_new(ec_group);
ret = EC_POINT_oct2point(ec_group, point, k, k_len, NULL);
ret = EC_KEY_set_public_key(ec_key, point);
if(point != NULL)
EC_POINT_free(point);
if(ec_ctx != NULL)
*ec_ctx = ec_key;
}
return (ret == 1) ? 0 : -1;
}
#define LIBSSH2_ECDSA_VERIFY(digest_type) \
{ \
unsigned char hash[SHA##digest_type##_DIGEST_LENGTH]; \
libssh2_sha##digest_type(m, m_len, hash); \
ret = ECDSA_do_verify(hash, SHA##digest_type##_DIGEST_LENGTH, \
ecdsa_sig, ec_key); \
\
}
int
_libssh2_ecdsa_verify(libssh2_ecdsa_ctx * ctx,
const unsigned char *r, size_t r_len,
const unsigned char *s, size_t s_len,
const unsigned char *m, size_t m_len)
{
int ret = 0;
EC_KEY *ec_key = (EC_KEY*)ctx;
libssh2_curve_type type = _libssh2_ecdsa_get_curve_type(ec_key);
#ifdef HAVE_OPAQUE_STRUCTS
ECDSA_SIG *ecdsa_sig = ECDSA_SIG_new();
BIGNUM *pr = BN_new();
BIGNUM *ps = BN_new();
BN_bin2bn(r, r_len, pr);
BN_bin2bn(s, s_len, ps);
ECDSA_SIG_set0(ecdsa_sig, pr, ps);
#else
ECDSA_SIG ecdsa_sig_;
ECDSA_SIG *ecdsa_sig = &ecdsa_sig_;
ecdsa_sig_.r = BN_new();
BN_bin2bn(r, r_len, ecdsa_sig_.r);
ecdsa_sig_.s = BN_new();
BN_bin2bn(s, s_len, ecdsa_sig_.s);
#endif
if(type == LIBSSH2_EC_CURVE_NISTP256) {
LIBSSH2_ECDSA_VERIFY(256);
}
else if(type == LIBSSH2_EC_CURVE_NISTP384) {
LIBSSH2_ECDSA_VERIFY(384);
}
else if(type == LIBSSH2_EC_CURVE_NISTP521) {
LIBSSH2_ECDSA_VERIFY(512);
}
#ifdef HAVE_OPAQUE_STRUCTS
if(ecdsa_sig)
ECDSA_SIG_free(ecdsa_sig);
#else
BN_clear_free(ecdsa_sig_.s);
BN_clear_free(ecdsa_sig_.r);
#endif
return (ret == 1) ? 0 : -1;
}
#endif /* LIBSSH2_ECDSA */
int
_libssh2_cipher_init(_libssh2_cipher_ctx * h,
_libssh2_cipher_type(algo),
unsigned char *iv, unsigned char *secret, int encrypt)
{
#ifdef HAVE_OPAQUE_STRUCTS
*h = EVP_CIPHER_CTX_new();
return !EVP_CipherInit(*h, algo(), secret, iv, encrypt);
#else
EVP_CIPHER_CTX_init(h);
return !EVP_CipherInit(h, algo(), secret, iv, encrypt);
#endif
}
int
_libssh2_cipher_crypt(_libssh2_cipher_ctx * ctx,
_libssh2_cipher_type(algo),
int encrypt, unsigned char *block, size_t blocksize)
{
unsigned char buf[EVP_MAX_BLOCK_LENGTH];
int ret;
(void) algo;
(void) encrypt;
#ifdef HAVE_OPAQUE_STRUCTS
ret = EVP_Cipher(*ctx, buf, block, blocksize);
#else
ret = EVP_Cipher(ctx, buf, block, blocksize);
#endif
if(ret == 1) {
memcpy(block, buf, blocksize);
}
return ret == 1 ? 0 : 1;
}
#ifndef HAVE_EVP_AES_128_CTR
static EVP_CIPHER * aes_128_ctr_cipher = NULL;
static EVP_CIPHER * aes_192_ctr_cipher = NULL;
static EVP_CIPHER * aes_256_ctr_cipher = NULL;
#endif
#if LIBSSH2_AES_CTR && !defined(HAVE_EVP_AES_128_CTR)
#include <openssl/aes.h>
#include <openssl/evp.h>
typedef struct
{
AES_KEY key;
EVP_CIPHER_CTX *aes_ctx;
unsigned char ctr[AES_BLOCK_SIZE];
} aes_ctr_ctx;
static int
aes_ctr_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc) /* init key */
{
/*
* variable "c" is leaked from this scope, but is later freed
* in aes_ctr_cleanup
*/
aes_ctr_ctx *c;
const EVP_CIPHER *aes_cipher;
(void) enc;
switch(EVP_CIPHER_CTX_key_length(ctx)) {
case 16:
aes_cipher = EVP_aes_128_ecb();
break;
case 24:
aes_cipher = EVP_aes_192_ecb();
break;
case 32:
aes_cipher = EVP_aes_256_ecb();
break;
default:
return 0;
}
c = malloc(sizeof(*c));
if(c == NULL)
return 0;
#ifdef HAVE_OPAQUE_STRUCTS
c->aes_ctx = EVP_CIPHER_CTX_new();
#else
c->aes_ctx = malloc(sizeof(EVP_CIPHER_CTX));
#endif
if(c->aes_ctx == NULL) {
free(c);
return 0;
}
if(EVP_EncryptInit(c->aes_ctx, aes_cipher, key, NULL) != 1) {
#ifdef HAVE_OPAQUE_STRUCTS
EVP_CIPHER_CTX_free(c->aes_ctx);
#else
free(c->aes_ctx);
#endif
free(c);
return 0;
}
EVP_CIPHER_CTX_set_padding(c->aes_ctx, 0);
memcpy(c->ctr, iv, AES_BLOCK_SIZE);
EVP_CIPHER_CTX_set_app_data(ctx, c);
return 1;
}
static int
aes_ctr_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in,
size_t inl) /* encrypt/decrypt data */
{
aes_ctr_ctx *c = EVP_CIPHER_CTX_get_app_data(ctx);
unsigned char b1[AES_BLOCK_SIZE];
int outlen = 0;
if(inl != 16) /* libssh2 only ever encrypt one block */
return 0;
if(c == NULL) {
return 0;
}
/*
To encrypt a packet P=P1||P2||...||Pn (where P1, P2, ..., Pn are each
blocks of length L), the encryptor first encrypts <X> with <cipher>
to obtain a block B1. The block B1 is then XORed with P1 to generate
the ciphertext block C1. The counter X is then incremented
*/
if(EVP_EncryptUpdate(c->aes_ctx, b1, &outlen,
c->ctr, AES_BLOCK_SIZE) != 1) {
return 0;
}
_libssh2_xor_data(out, in, b1, AES_BLOCK_SIZE);
_libssh2_aes_ctr_increment(c->ctr, AES_BLOCK_SIZE);
return 1;
}
static int
aes_ctr_cleanup(EVP_CIPHER_CTX *ctx) /* cleanup ctx */
{
aes_ctr_ctx *c = EVP_CIPHER_CTX_get_app_data(ctx);
if(c == NULL) {
return 1;
}
if(c->aes_ctx != NULL) {
#ifdef HAVE_OPAQUE_STRUCTS
EVP_CIPHER_CTX_free(c->aes_ctx);
#else
_libssh2_cipher_dtor(c->aes_ctx);
free(c->aes_ctx);
#endif
}
free(c);
return 1;
}
static const EVP_CIPHER *
make_ctr_evp (size_t keylen, EVP_CIPHER **aes_ctr_cipher, int type)
{
#ifdef HAVE_OPAQUE_STRUCTS
*aes_ctr_cipher = EVP_CIPHER_meth_new(type, 16, keylen);
if(*aes_ctr_cipher) {
EVP_CIPHER_meth_set_iv_length(*aes_ctr_cipher, 16);
EVP_CIPHER_meth_set_init(*aes_ctr_cipher, aes_ctr_init);
EVP_CIPHER_meth_set_do_cipher(*aes_ctr_cipher, aes_ctr_do_cipher);
EVP_CIPHER_meth_set_cleanup(*aes_ctr_cipher, aes_ctr_cleanup);
}
#else
(*aes_ctr_cipher)->nid = type;
(*aes_ctr_cipher)->block_size = 16;
(*aes_ctr_cipher)->key_len = keylen;
(*aes_ctr_cipher)->iv_len = 16;
(*aes_ctr_cipher)->init = aes_ctr_init;
(*aes_ctr_cipher)->do_cipher = aes_ctr_do_cipher;
(*aes_ctr_cipher)->cleanup = aes_ctr_cleanup;
#endif
return *aes_ctr_cipher;
}
const EVP_CIPHER *
_libssh2_EVP_aes_128_ctr(void)
{
#ifdef HAVE_OPAQUE_STRUCTS
return !aes_128_ctr_cipher ?
make_ctr_evp(16, &aes_128_ctr_cipher, NID_aes_128_ctr) :
aes_128_ctr_cipher;
#else
static EVP_CIPHER aes_ctr_cipher;
static EVP_CIPHER * aes_ctr_cipher_ptr = &aes_ctr_cipher;
return !aes_ctr_cipher.key_len ?
make_ctr_evp(16, &aes_ctr_cipher_ptr, 0) : &aes_ctr_cipher;
#endif
}
const EVP_CIPHER *
_libssh2_EVP_aes_192_ctr(void)
{
#ifdef HAVE_OPAQUE_STRUCTS
return !aes_192_ctr_cipher ?
make_ctr_evp(24, &aes_192_ctr_cipher, NID_aes_192_ctr) :
aes_192_ctr_cipher;
#else
static EVP_CIPHER aes_ctr_cipher;
static EVP_CIPHER * aes_ctr_cipher_ptr = &aes_ctr_cipher;
return !aes_ctr_cipher.key_len ?
make_ctr_evp(24, &aes_ctr_cipher_ptr, 0) : &aes_ctr_cipher;
#endif
}
const EVP_CIPHER *
_libssh2_EVP_aes_256_ctr(void)
{
#ifdef HAVE_OPAQUE_STRUCTS
return !aes_256_ctr_cipher ?
make_ctr_evp(32, &aes_256_ctr_cipher, NID_aes_256_ctr) :
aes_256_ctr_cipher;
#else
static EVP_CIPHER aes_ctr_cipher;
static EVP_CIPHER * aes_ctr_cipher_ptr = &aes_ctr_cipher;
return !aes_ctr_cipher.key_len ?
make_ctr_evp(32, &aes_ctr_cipher_ptr, 0) : &aes_ctr_cipher;
#endif
}
#endif /* LIBSSH2_AES_CTR */
void _libssh2_openssl_crypto_init(void)
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L && \
!defined(LIBRESSL_VERSION_NUMBER)
#ifndef OPENSSL_NO_ENGINE
ENGINE_load_builtin_engines();
ENGINE_register_all_complete();
#endif
#else
OpenSSL_add_all_algorithms();
OpenSSL_add_all_ciphers();
OpenSSL_add_all_digests();
#ifndef OPENSSL_NO_ENGINE
ENGINE_load_builtin_engines();
ENGINE_register_all_complete();
#endif
#endif
#ifndef HAVE_EVP_AES_128_CTR
aes_128_ctr_cipher = (EVP_CIPHER *) _libssh2_EVP_aes_128_ctr();
aes_192_ctr_cipher = (EVP_CIPHER *) _libssh2_EVP_aes_192_ctr();
aes_256_ctr_cipher = (EVP_CIPHER *) _libssh2_EVP_aes_256_ctr();
#endif
}
void _libssh2_openssl_crypto_exit(void)
{
#ifndef HAVE_EVP_AES_128_CTR
#ifdef HAVE_OPAQUE_STRUCTS
if(aes_128_ctr_cipher) {
EVP_CIPHER_meth_free(aes_128_ctr_cipher);
}
if(aes_192_ctr_cipher) {
EVP_CIPHER_meth_free(aes_192_ctr_cipher);
}
if(aes_256_ctr_cipher) {
EVP_CIPHER_meth_free(aes_256_ctr_cipher);
}
#endif
aes_128_ctr_cipher = NULL;
aes_192_ctr_cipher = NULL;
aes_256_ctr_cipher = NULL;
#endif
}
/* TODO: Optionally call a passphrase callback specified by the
* calling program
*/
static int
passphrase_cb(char *buf, int size, int rwflag, char *passphrase)
{
int passphrase_len = strlen(passphrase);
(void) rwflag;
if(passphrase_len > (size - 1)) {
passphrase_len = size - 1;
}
memcpy(buf, passphrase, passphrase_len);
buf[passphrase_len] = '\0';
return passphrase_len;
}
typedef void * (*pem_read_bio_func)(BIO *, void **, pem_password_cb *,
void *u);
static int
read_private_key_from_memory(void **key_ctx,
pem_read_bio_func read_private_key,
const char *filedata,
size_t filedata_len,
unsigned const char *passphrase)
{
BIO * bp;
*key_ctx = NULL;
bp = BIO_new_mem_buf((char *)filedata, filedata_len);
if(!bp) {
return -1;
}
*key_ctx = read_private_key(bp, NULL, (pem_password_cb *) passphrase_cb,
(void *) passphrase);
BIO_free(bp);
return (*key_ctx) ? 0 : -1;
}
static int
read_private_key_from_file(void **key_ctx,
pem_read_bio_func read_private_key,
const char *filename,
unsigned const char *passphrase)
{
BIO * bp;
*key_ctx = NULL;
bp = BIO_new_file(filename, "r");
if(!bp) {
return -1;
}
*key_ctx = read_private_key(bp, NULL, (pem_password_cb *) passphrase_cb,
(void *) passphrase);
BIO_free(bp);
return (*key_ctx) ? 0 : -1;
}
int
_libssh2_rsa_new_private_frommemory(libssh2_rsa_ctx ** rsa,
LIBSSH2_SESSION * session,
const char *filedata, size_t filedata_len,
unsigned const char *passphrase)
{
int rc;
pem_read_bio_func read_rsa =
(pem_read_bio_func) &PEM_read_bio_RSAPrivateKey;
_libssh2_init_if_needed();
rc = read_private_key_from_memory((void **) rsa, read_rsa,
filedata, filedata_len, passphrase);
if(rc) {
rc = read_openssh_private_key_from_memory((void **)rsa, session,
"ssh-rsa", filedata, filedata_len, passphrase);
}
return rc;
}
static unsigned char *
gen_publickey_from_rsa(LIBSSH2_SESSION *session, RSA *rsa,
size_t *key_len)
{
int e_bytes, n_bytes;
unsigned long len;
unsigned char *key;
unsigned char *p;
const BIGNUM * e;
const BIGNUM * n;
#ifdef HAVE_OPAQUE_STRUCTS
RSA_get0_key(rsa, &n, &e, NULL);
#else
e = rsa->e;
n = rsa->n;
#endif
e_bytes = BN_num_bytes(e) + 1;
n_bytes = BN_num_bytes(n) + 1;
/* Key form is "ssh-rsa" + e + n. */
len = 4 + 7 + 4 + e_bytes + 4 + n_bytes;
key = LIBSSH2_ALLOC(session, len);
if(key == NULL) {
return NULL;
}
/* Process key encoding. */
p = key;
_libssh2_htonu32(p, 7); /* Key type. */
p += 4;
memcpy(p, "ssh-rsa", 7);
p += 7;
p = write_bn(p, e, e_bytes);
p = write_bn(p, n, n_bytes);
*key_len = (size_t)(p - key);
return key;
}
static int
gen_publickey_from_rsa_evp(LIBSSH2_SESSION *session,
unsigned char **method,
size_t *method_len,
unsigned char **pubkeydata,
size_t *pubkeydata_len,
EVP_PKEY *pk)
{
RSA* rsa = NULL;
unsigned char *key;
unsigned char *method_buf = NULL;
size_t key_len;
_libssh2_debug(session,
LIBSSH2_TRACE_AUTH,
"Computing public key from RSA private key envelope");
rsa = EVP_PKEY_get1_RSA(pk);
if(rsa == NULL) {
/* Assume memory allocation error... what else could it be ? */
goto __alloc_error;
}
method_buf = LIBSSH2_ALLOC(session, 7); /* ssh-rsa. */
if(method_buf == NULL) {
goto __alloc_error;
}
key = gen_publickey_from_rsa(session, rsa, &key_len);
if(key == NULL) {
goto __alloc_error;
}
RSA_free(rsa);
memcpy(method_buf, "ssh-rsa", 7);
*method = method_buf;
*method_len = 7;
*pubkeydata = key;
*pubkeydata_len = key_len;
return 0;
__alloc_error:
if(rsa != NULL) {
RSA_free(rsa);
}
if(method_buf != NULL) {
LIBSSH2_FREE(session, method_buf);
}
return _libssh2_error(session,
LIBSSH2_ERROR_ALLOC,
"Unable to allocate memory for private key data");
}
static int _libssh2_rsa_new_additional_parameters(RSA *rsa)
{
BN_CTX *ctx = NULL;
BIGNUM *aux = NULL;
BIGNUM *dmp1 = NULL;
BIGNUM *dmq1 = NULL;
const BIGNUM *p = NULL;
const BIGNUM *q = NULL;
const BIGNUM *d = NULL;
int rc = 0;
#ifdef HAVE_OPAQUE_STRUCTS
RSA_get0_key(rsa, NULL, NULL, &d);
RSA_get0_factors(rsa, &p, &q);
#else
d = (*rsa).d;
p = (*rsa).p;
q = (*rsa).q;
#endif
ctx = BN_CTX_new();
if(ctx == NULL)
return -1;
aux = BN_new();
if(aux == NULL) {
rc = -1;
goto out;
}
dmp1 = BN_new();
if(dmp1 == NULL) {
rc = -1;
goto out;
}
dmq1 = BN_new();
if(dmq1 == NULL) {
rc = -1;
goto out;
}
if((BN_sub(aux, q, BN_value_one()) == 0) ||
(BN_mod(dmq1, d, aux, ctx) == 0) ||
(BN_sub(aux, p, BN_value_one()) == 0) ||
(BN_mod(dmp1, d, aux, ctx) == 0)) {
rc = -1;
goto out;
}
#ifdef HAVE_OPAQUE_STRUCTS
RSA_set0_crt_params(rsa, dmp1, dmq1, NULL);
#else
(*rsa).dmp1 = dmp1;
(*rsa).dmq1 = dmq1;
#endif
out:
if(aux)
BN_clear_free(aux);
BN_CTX_free(ctx);
if(rc != 0) {
if(dmp1)
BN_clear_free(dmp1);
if(dmq1)
BN_clear_free(dmq1);
}
return rc;
}
static int
gen_publickey_from_rsa_openssh_priv_data(LIBSSH2_SESSION *session,
struct string_buf *decrypted,
unsigned char **method,
size_t *method_len,
unsigned char **pubkeydata,
size_t *pubkeydata_len,
libssh2_rsa_ctx **rsa_ctx)
{
int rc = 0;
size_t nlen, elen, dlen, plen, qlen, coefflen, commentlen;
unsigned char *n, *e, *d, *p, *q, *coeff, *comment;
RSA *rsa = NULL;
_libssh2_debug(session,
LIBSSH2_TRACE_AUTH,
"Computing RSA keys from private key data");
/* public key data */
if(_libssh2_get_bignum_bytes(decrypted, &n, &nlen)) {
_libssh2_error(session, LIBSSH2_ERROR_PROTO,
"RSA no n");
return -1;
}
if(_libssh2_get_bignum_bytes(decrypted, &e, &elen)) {
_libssh2_error(session, LIBSSH2_ERROR_PROTO,
"RSA no e");
return -1;
}
/* private key data */
if(_libssh2_get_bignum_bytes(decrypted, &d, &dlen)) {
_libssh2_error(session, LIBSSH2_ERROR_PROTO,
"RSA no d");
return -1;
}
if(_libssh2_get_bignum_bytes(decrypted, &coeff, &coefflen)) {
_libssh2_error(session, LIBSSH2_ERROR_PROTO,
"RSA no coeff");
return -1;
}
if(_libssh2_get_bignum_bytes(decrypted, &p, &plen)) {
_libssh2_error(session, LIBSSH2_ERROR_PROTO,
"RSA no p");
return -1;
}
if(_libssh2_get_bignum_bytes(decrypted, &q, &qlen)) {
_libssh2_error(session, LIBSSH2_ERROR_PROTO,
"RSA no q");
return -1;