705 lines
19 KiB
C
705 lines
19 KiB
C
/* crypto/srp/srp_vfy.c */
|
|
/*
|
|
* Written by Christophe Renou (christophe.renou@edelweb.fr) with the
|
|
* precious help of Peter Sylvester (peter.sylvester@edelweb.fr) for the
|
|
* EdelKey project and contributed to the OpenSSL project 2004.
|
|
*/
|
|
/* ====================================================================
|
|
* Copyright (c) 2004 The OpenSSL Project. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. 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.
|
|
*
|
|
* 3. All advertising materials mentioning features or use of this
|
|
* software must display the following acknowledgment:
|
|
* "This product includes software developed by the OpenSSL Project
|
|
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
|
|
*
|
|
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
|
|
* endorse or promote products derived from this software without
|
|
* prior written permission. For written permission, please contact
|
|
* licensing@OpenSSL.org.
|
|
*
|
|
* 5. Products derived from this software may not be called "OpenSSL"
|
|
* nor may "OpenSSL" appear in their names without prior written
|
|
* permission of the OpenSSL Project.
|
|
*
|
|
* 6. Redistributions of any form whatsoever must retain the following
|
|
* acknowledgment:
|
|
* "This product includes software developed by the OpenSSL Project
|
|
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
|
|
* EXPRESSED 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 OpenSSL PROJECT OR
|
|
* ITS 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.
|
|
* ====================================================================
|
|
*
|
|
* This product includes cryptographic software written by Eric Young
|
|
* (eay@cryptsoft.com). This product includes software written by Tim
|
|
* Hudson (tjh@cryptsoft.com).
|
|
*
|
|
*/
|
|
#ifndef OPENSSL_NO_SRP
|
|
# include "cryptlib.h"
|
|
# include "srp_lcl.h"
|
|
# include <openssl/srp.h>
|
|
# include <openssl/evp.h>
|
|
# include <openssl/buffer.h>
|
|
# include <openssl/rand.h>
|
|
# include <openssl/txt_db.h>
|
|
|
|
# define SRP_RANDOM_SALT_LEN 20
|
|
# define MAX_LEN 2500
|
|
|
|
static char b64table[] =
|
|
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz./";
|
|
|
|
/*
|
|
* the following two conversion routines have been inspired by code from
|
|
* Stanford
|
|
*/
|
|
|
|
/*
|
|
* Convert a base64 string into raw byte array representation.
|
|
*/
|
|
static int t_fromb64(unsigned char *a, const char *src)
|
|
{
|
|
char *loc;
|
|
int i, j;
|
|
int size;
|
|
|
|
while (*src && (*src == ' ' || *src == '\t' || *src == '\n'))
|
|
++src;
|
|
size = strlen(src);
|
|
i = 0;
|
|
while (i < size) {
|
|
loc = strchr(b64table, src[i]);
|
|
if (loc == (char *)0)
|
|
break;
|
|
else
|
|
a[i] = loc - b64table;
|
|
++i;
|
|
}
|
|
/* if nothing valid to process we have a zero length response */
|
|
if (i == 0)
|
|
return 0;
|
|
size = i;
|
|
i = size - 1;
|
|
j = size;
|
|
while (1) {
|
|
a[j] = a[i];
|
|
if (--i < 0)
|
|
break;
|
|
a[j] |= (a[i] & 3) << 6;
|
|
--j;
|
|
a[j] = (unsigned char)((a[i] & 0x3c) >> 2);
|
|
if (--i < 0)
|
|
break;
|
|
a[j] |= (a[i] & 0xf) << 4;
|
|
--j;
|
|
a[j] = (unsigned char)((a[i] & 0x30) >> 4);
|
|
if (--i < 0)
|
|
break;
|
|
a[j] |= (a[i] << 2);
|
|
|
|
a[--j] = 0;
|
|
if (--i < 0)
|
|
break;
|
|
}
|
|
while (a[j] == 0 && j <= size)
|
|
++j;
|
|
i = 0;
|
|
while (j <= size)
|
|
a[i++] = a[j++];
|
|
return i;
|
|
}
|
|
|
|
/*
|
|
* Convert a raw byte string into a null-terminated base64 ASCII string.
|
|
*/
|
|
static char *t_tob64(char *dst, const unsigned char *src, int size)
|
|
{
|
|
int c, pos = size % 3;
|
|
unsigned char b0 = 0, b1 = 0, b2 = 0, notleading = 0;
|
|
char *olddst = dst;
|
|
|
|
switch (pos) {
|
|
case 1:
|
|
b2 = src[0];
|
|
break;
|
|
case 2:
|
|
b1 = src[0];
|
|
b2 = src[1];
|
|
break;
|
|
}
|
|
|
|
while (1) {
|
|
c = (b0 & 0xfc) >> 2;
|
|
if (notleading || c != 0) {
|
|
*dst++ = b64table[c];
|
|
notleading = 1;
|
|
}
|
|
c = ((b0 & 3) << 4) | ((b1 & 0xf0) >> 4);
|
|
if (notleading || c != 0) {
|
|
*dst++ = b64table[c];
|
|
notleading = 1;
|
|
}
|
|
c = ((b1 & 0xf) << 2) | ((b2 & 0xc0) >> 6);
|
|
if (notleading || c != 0) {
|
|
*dst++ = b64table[c];
|
|
notleading = 1;
|
|
}
|
|
c = b2 & 0x3f;
|
|
if (notleading || c != 0) {
|
|
*dst++ = b64table[c];
|
|
notleading = 1;
|
|
}
|
|
if (pos >= size)
|
|
break;
|
|
else {
|
|
b0 = src[pos++];
|
|
b1 = src[pos++];
|
|
b2 = src[pos++];
|
|
}
|
|
}
|
|
|
|
*dst++ = '\0';
|
|
return olddst;
|
|
}
|
|
|
|
void SRP_user_pwd_free(SRP_user_pwd *user_pwd)
|
|
{
|
|
if (user_pwd == NULL)
|
|
return;
|
|
BN_free(user_pwd->s);
|
|
BN_clear_free(user_pwd->v);
|
|
OPENSSL_free(user_pwd->id);
|
|
OPENSSL_free(user_pwd->info);
|
|
OPENSSL_free(user_pwd);
|
|
}
|
|
|
|
static SRP_user_pwd *SRP_user_pwd_new()
|
|
{
|
|
SRP_user_pwd *ret = OPENSSL_malloc(sizeof(SRP_user_pwd));
|
|
if (ret == NULL)
|
|
return NULL;
|
|
ret->N = NULL;
|
|
ret->g = NULL;
|
|
ret->s = NULL;
|
|
ret->v = NULL;
|
|
ret->id = NULL;
|
|
ret->info = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static void SRP_user_pwd_set_gN(SRP_user_pwd *vinfo, const BIGNUM *g,
|
|
const BIGNUM *N)
|
|
{
|
|
vinfo->N = N;
|
|
vinfo->g = g;
|
|
}
|
|
|
|
static int SRP_user_pwd_set_ids(SRP_user_pwd *vinfo, const char *id,
|
|
const char *info)
|
|
{
|
|
if (id != NULL && NULL == (vinfo->id = BUF_strdup(id)))
|
|
return 0;
|
|
return (info == NULL || NULL != (vinfo->info = BUF_strdup(info)));
|
|
}
|
|
|
|
static int SRP_user_pwd_set_sv(SRP_user_pwd *vinfo, const char *s,
|
|
const char *v)
|
|
{
|
|
unsigned char tmp[MAX_LEN];
|
|
int len;
|
|
|
|
if (strlen(s) > MAX_LEN || strlen(v) > MAX_LEN)
|
|
return 0;
|
|
len = t_fromb64(tmp, v);
|
|
if (NULL == (vinfo->v = BN_bin2bn(tmp, len, NULL)))
|
|
return 0;
|
|
len = t_fromb64(tmp, s);
|
|
return ((vinfo->s = BN_bin2bn(tmp, len, NULL)) != NULL);
|
|
}
|
|
|
|
static int SRP_user_pwd_set_sv_BN(SRP_user_pwd *vinfo, BIGNUM *s, BIGNUM *v)
|
|
{
|
|
vinfo->v = v;
|
|
vinfo->s = s;
|
|
return (vinfo->s != NULL && vinfo->v != NULL);
|
|
}
|
|
|
|
static SRP_user_pwd *srp_user_pwd_dup(SRP_user_pwd *src)
|
|
{
|
|
SRP_user_pwd *ret;
|
|
|
|
if (src == NULL)
|
|
return NULL;
|
|
if ((ret = SRP_user_pwd_new()) == NULL)
|
|
return NULL;
|
|
|
|
SRP_user_pwd_set_gN(ret, src->g, src->N);
|
|
if (!SRP_user_pwd_set_ids(ret, src->id, src->info)
|
|
|| !SRP_user_pwd_set_sv_BN(ret, BN_dup(src->s), BN_dup(src->v))) {
|
|
SRP_user_pwd_free(ret);
|
|
return NULL;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
SRP_VBASE *SRP_VBASE_new(char *seed_key)
|
|
{
|
|
SRP_VBASE *vb = (SRP_VBASE *)OPENSSL_malloc(sizeof(SRP_VBASE));
|
|
|
|
if (vb == NULL)
|
|
return NULL;
|
|
if (!(vb->users_pwd = sk_SRP_user_pwd_new_null()) ||
|
|
!(vb->gN_cache = sk_SRP_gN_cache_new_null())) {
|
|
OPENSSL_free(vb);
|
|
return NULL;
|
|
}
|
|
vb->default_g = NULL;
|
|
vb->default_N = NULL;
|
|
vb->seed_key = NULL;
|
|
if ((seed_key != NULL) && (vb->seed_key = BUF_strdup(seed_key)) == NULL) {
|
|
sk_SRP_user_pwd_free(vb->users_pwd);
|
|
sk_SRP_gN_cache_free(vb->gN_cache);
|
|
OPENSSL_free(vb);
|
|
return NULL;
|
|
}
|
|
return vb;
|
|
}
|
|
|
|
int SRP_VBASE_free(SRP_VBASE *vb)
|
|
{
|
|
sk_SRP_user_pwd_pop_free(vb->users_pwd, SRP_user_pwd_free);
|
|
sk_SRP_gN_cache_free(vb->gN_cache);
|
|
OPENSSL_free(vb->seed_key);
|
|
OPENSSL_free(vb);
|
|
return 0;
|
|
}
|
|
|
|
static SRP_gN_cache *SRP_gN_new_init(const char *ch)
|
|
{
|
|
unsigned char tmp[MAX_LEN];
|
|
int len;
|
|
|
|
SRP_gN_cache *newgN =
|
|
(SRP_gN_cache *)OPENSSL_malloc(sizeof(SRP_gN_cache));
|
|
if (newgN == NULL)
|
|
return NULL;
|
|
|
|
if ((newgN->b64_bn = BUF_strdup(ch)) == NULL)
|
|
goto err;
|
|
|
|
len = t_fromb64(tmp, ch);
|
|
if ((newgN->bn = BN_bin2bn(tmp, len, NULL)))
|
|
return newgN;
|
|
|
|
OPENSSL_free(newgN->b64_bn);
|
|
err:
|
|
OPENSSL_free(newgN);
|
|
return NULL;
|
|
}
|
|
|
|
static void SRP_gN_free(SRP_gN_cache *gN_cache)
|
|
{
|
|
if (gN_cache == NULL)
|
|
return;
|
|
OPENSSL_free(gN_cache->b64_bn);
|
|
BN_free(gN_cache->bn);
|
|
OPENSSL_free(gN_cache);
|
|
}
|
|
|
|
static SRP_gN *SRP_get_gN_by_id(const char *id, STACK_OF(SRP_gN) *gN_tab)
|
|
{
|
|
int i;
|
|
|
|
SRP_gN *gN;
|
|
if (gN_tab != NULL)
|
|
for (i = 0; i < sk_SRP_gN_num(gN_tab); i++) {
|
|
gN = sk_SRP_gN_value(gN_tab, i);
|
|
if (gN && (id == NULL || strcmp(gN->id, id) == 0))
|
|
return gN;
|
|
}
|
|
|
|
return SRP_get_default_gN(id);
|
|
}
|
|
|
|
static BIGNUM *SRP_gN_place_bn(STACK_OF(SRP_gN_cache) *gN_cache, char *ch)
|
|
{
|
|
int i;
|
|
if (gN_cache == NULL)
|
|
return NULL;
|
|
|
|
/* search if we have already one... */
|
|
for (i = 0; i < sk_SRP_gN_cache_num(gN_cache); i++) {
|
|
SRP_gN_cache *cache = sk_SRP_gN_cache_value(gN_cache, i);
|
|
if (strcmp(cache->b64_bn, ch) == 0)
|
|
return cache->bn;
|
|
}
|
|
{ /* it is the first time that we find it */
|
|
SRP_gN_cache *newgN = SRP_gN_new_init(ch);
|
|
if (newgN) {
|
|
if (sk_SRP_gN_cache_insert(gN_cache, newgN, 0) > 0)
|
|
return newgN->bn;
|
|
SRP_gN_free(newgN);
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* this function parses verifier file. Format is:
|
|
* string(index):base64(N):base64(g):0
|
|
* string(username):base64(v):base64(salt):int(index)
|
|
*/
|
|
|
|
int SRP_VBASE_init(SRP_VBASE *vb, char *verifier_file)
|
|
{
|
|
int error_code;
|
|
STACK_OF(SRP_gN) *SRP_gN_tab = sk_SRP_gN_new_null();
|
|
char *last_index = NULL;
|
|
int i;
|
|
char **pp;
|
|
|
|
SRP_gN *gN = NULL;
|
|
SRP_user_pwd *user_pwd = NULL;
|
|
|
|
TXT_DB *tmpdb = NULL;
|
|
BIO *in = BIO_new(BIO_s_file());
|
|
|
|
error_code = SRP_ERR_OPEN_FILE;
|
|
|
|
if (in == NULL || BIO_read_filename(in, verifier_file) <= 0)
|
|
goto err;
|
|
|
|
error_code = SRP_ERR_VBASE_INCOMPLETE_FILE;
|
|
|
|
if ((tmpdb = TXT_DB_read(in, DB_NUMBER)) == NULL)
|
|
goto err;
|
|
|
|
error_code = SRP_ERR_MEMORY;
|
|
|
|
if (vb->seed_key) {
|
|
last_index = SRP_get_default_gN(NULL)->id;
|
|
}
|
|
for (i = 0; i < sk_OPENSSL_PSTRING_num(tmpdb->data); i++) {
|
|
pp = sk_OPENSSL_PSTRING_value(tmpdb->data, i);
|
|
if (pp[DB_srptype][0] == DB_SRP_INDEX) {
|
|
/*
|
|
* we add this couple in the internal Stack
|
|
*/
|
|
|
|
if ((gN = (SRP_gN *) OPENSSL_malloc(sizeof(SRP_gN))) == NULL)
|
|
goto err;
|
|
|
|
if (!(gN->id = BUF_strdup(pp[DB_srpid]))
|
|
|| !(gN->N =
|
|
SRP_gN_place_bn(vb->gN_cache, pp[DB_srpverifier]))
|
|
|| !(gN->g = SRP_gN_place_bn(vb->gN_cache, pp[DB_srpsalt]))
|
|
|| sk_SRP_gN_insert(SRP_gN_tab, gN, 0) == 0)
|
|
goto err;
|
|
|
|
gN = NULL;
|
|
|
|
if (vb->seed_key != NULL) {
|
|
last_index = pp[DB_srpid];
|
|
}
|
|
} else if (pp[DB_srptype][0] == DB_SRP_VALID) {
|
|
/* it is a user .... */
|
|
SRP_gN *lgN;
|
|
if ((lgN = SRP_get_gN_by_id(pp[DB_srpgN], SRP_gN_tab)) != NULL) {
|
|
error_code = SRP_ERR_MEMORY;
|
|
if ((user_pwd = SRP_user_pwd_new()) == NULL)
|
|
goto err;
|
|
|
|
SRP_user_pwd_set_gN(user_pwd, lgN->g, lgN->N);
|
|
if (!SRP_user_pwd_set_ids
|
|
(user_pwd, pp[DB_srpid], pp[DB_srpinfo]))
|
|
goto err;
|
|
|
|
error_code = SRP_ERR_VBASE_BN_LIB;
|
|
if (!SRP_user_pwd_set_sv
|
|
(user_pwd, pp[DB_srpsalt], pp[DB_srpverifier]))
|
|
goto err;
|
|
|
|
if (sk_SRP_user_pwd_insert(vb->users_pwd, user_pwd, 0) == 0)
|
|
goto err;
|
|
user_pwd = NULL; /* abandon responsability */
|
|
}
|
|
}
|
|
}
|
|
|
|
if (last_index != NULL) {
|
|
/* this means that we want to simulate a default user */
|
|
|
|
if (((gN = SRP_get_gN_by_id(last_index, SRP_gN_tab)) == NULL)) {
|
|
error_code = SRP_ERR_VBASE_BN_LIB;
|
|
goto err;
|
|
}
|
|
vb->default_g = gN->g;
|
|
vb->default_N = gN->N;
|
|
gN = NULL;
|
|
}
|
|
error_code = SRP_NO_ERROR;
|
|
|
|
err:
|
|
/*
|
|
* there may be still some leaks to fix, if this fails, the application
|
|
* terminates most likely
|
|
*/
|
|
|
|
if (gN != NULL) {
|
|
OPENSSL_free(gN->id);
|
|
OPENSSL_free(gN);
|
|
}
|
|
|
|
SRP_user_pwd_free(user_pwd);
|
|
|
|
if (tmpdb)
|
|
TXT_DB_free(tmpdb);
|
|
if (in)
|
|
BIO_free_all(in);
|
|
|
|
sk_SRP_gN_free(SRP_gN_tab);
|
|
|
|
return error_code;
|
|
|
|
}
|
|
|
|
static SRP_user_pwd *find_user(SRP_VBASE *vb, char *username)
|
|
{
|
|
int i;
|
|
SRP_user_pwd *user;
|
|
|
|
if (vb == NULL)
|
|
return NULL;
|
|
|
|
for (i = 0; i < sk_SRP_user_pwd_num(vb->users_pwd); i++) {
|
|
user = sk_SRP_user_pwd_value(vb->users_pwd, i);
|
|
if (strcmp(user->id, username) == 0)
|
|
return user;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* This method ignores the configured seed and fails for an unknown user.
|
|
* Ownership of the returned pointer is not released to the caller.
|
|
* In other words, caller must not free the result.
|
|
*/
|
|
SRP_user_pwd *SRP_VBASE_get_by_user(SRP_VBASE *vb, char *username)
|
|
{
|
|
return find_user(vb, username);
|
|
}
|
|
|
|
/*
|
|
* Ownership of the returned pointer is released to the caller.
|
|
* In other words, caller must free the result once done.
|
|
*/
|
|
SRP_user_pwd *SRP_VBASE_get1_by_user(SRP_VBASE *vb, char *username)
|
|
{
|
|
SRP_user_pwd *user;
|
|
unsigned char digv[SHA_DIGEST_LENGTH];
|
|
unsigned char digs[SHA_DIGEST_LENGTH];
|
|
EVP_MD_CTX ctxt;
|
|
|
|
if (vb == NULL)
|
|
return NULL;
|
|
|
|
if ((user = find_user(vb, username)) != NULL)
|
|
return srp_user_pwd_dup(user);
|
|
|
|
if ((vb->seed_key == NULL) ||
|
|
(vb->default_g == NULL) || (vb->default_N == NULL))
|
|
return NULL;
|
|
|
|
/* if the user is unknown we set parameters as well if we have a seed_key */
|
|
|
|
if ((user = SRP_user_pwd_new()) == NULL)
|
|
return NULL;
|
|
|
|
SRP_user_pwd_set_gN(user, vb->default_g, vb->default_N);
|
|
|
|
if (!SRP_user_pwd_set_ids(user, username, NULL))
|
|
goto err;
|
|
|
|
if (RAND_pseudo_bytes(digv, SHA_DIGEST_LENGTH) < 0)
|
|
goto err;
|
|
EVP_MD_CTX_init(&ctxt);
|
|
EVP_DigestInit_ex(&ctxt, EVP_sha1(), NULL);
|
|
EVP_DigestUpdate(&ctxt, vb->seed_key, strlen(vb->seed_key));
|
|
EVP_DigestUpdate(&ctxt, username, strlen(username));
|
|
EVP_DigestFinal_ex(&ctxt, digs, NULL);
|
|
EVP_MD_CTX_cleanup(&ctxt);
|
|
if (SRP_user_pwd_set_sv_BN
|
|
(user, BN_bin2bn(digs, SHA_DIGEST_LENGTH, NULL),
|
|
BN_bin2bn(digv, SHA_DIGEST_LENGTH, NULL)))
|
|
return user;
|
|
|
|
err:SRP_user_pwd_free(user);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* create a verifier (*salt,*verifier,g and N are in base64)
|
|
*/
|
|
char *SRP_create_verifier(const char *user, const char *pass, char **salt,
|
|
char **verifier, const char *N, const char *g)
|
|
{
|
|
int len;
|
|
char *result = NULL, *vf = NULL;
|
|
BIGNUM *N_bn = NULL, *g_bn = NULL, *s = NULL, *v = NULL;
|
|
unsigned char tmp[MAX_LEN];
|
|
unsigned char tmp2[MAX_LEN];
|
|
char *defgNid = NULL;
|
|
int vfsize = 0;
|
|
|
|
if ((user == NULL) ||
|
|
(pass == NULL) || (salt == NULL) || (verifier == NULL))
|
|
goto err;
|
|
|
|
if (N) {
|
|
if (!(len = t_fromb64(tmp, N)))
|
|
goto err;
|
|
N_bn = BN_bin2bn(tmp, len, NULL);
|
|
if (!(len = t_fromb64(tmp, g)))
|
|
goto err;
|
|
g_bn = BN_bin2bn(tmp, len, NULL);
|
|
defgNid = "*";
|
|
} else {
|
|
SRP_gN *gN = SRP_get_gN_by_id(g, NULL);
|
|
if (gN == NULL)
|
|
goto err;
|
|
N_bn = gN->N;
|
|
g_bn = gN->g;
|
|
defgNid = gN->id;
|
|
}
|
|
|
|
if (*salt == NULL) {
|
|
if (RAND_pseudo_bytes(tmp2, SRP_RANDOM_SALT_LEN) < 0)
|
|
goto err;
|
|
|
|
s = BN_bin2bn(tmp2, SRP_RANDOM_SALT_LEN, NULL);
|
|
} else {
|
|
if (!(len = t_fromb64(tmp2, *salt)))
|
|
goto err;
|
|
s = BN_bin2bn(tmp2, len, NULL);
|
|
}
|
|
|
|
if (!SRP_create_verifier_BN(user, pass, &s, &v, N_bn, g_bn))
|
|
goto err;
|
|
|
|
BN_bn2bin(v, tmp);
|
|
vfsize = BN_num_bytes(v) * 2;
|
|
if (((vf = OPENSSL_malloc(vfsize)) == NULL))
|
|
goto err;
|
|
t_tob64(vf, tmp, BN_num_bytes(v));
|
|
|
|
if (*salt == NULL) {
|
|
char *tmp_salt;
|
|
|
|
if ((tmp_salt = OPENSSL_malloc(SRP_RANDOM_SALT_LEN * 2)) == NULL) {
|
|
goto err;
|
|
}
|
|
t_tob64(tmp_salt, tmp2, SRP_RANDOM_SALT_LEN);
|
|
*salt = tmp_salt;
|
|
}
|
|
|
|
*verifier = vf;
|
|
vf = NULL;
|
|
result = defgNid;
|
|
|
|
err:
|
|
if (N) {
|
|
BN_free(N_bn);
|
|
BN_free(g_bn);
|
|
}
|
|
OPENSSL_cleanse(vf, vfsize);
|
|
OPENSSL_free(vf);
|
|
BN_clear_free(s);
|
|
BN_clear_free(v);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* create a verifier (*salt,*verifier,g and N are BIGNUMs). If *salt != NULL
|
|
* then the provided salt will be used. On successful exit *verifier will point
|
|
* to a newly allocated BIGNUM containing the verifier and (if a salt was not
|
|
* provided) *salt will be populated with a newly allocated BIGNUM containing a
|
|
* random salt.
|
|
* The caller is responsible for freeing the allocated *salt and *verifier
|
|
* BIGNUMS.
|
|
*/
|
|
int SRP_create_verifier_BN(const char *user, const char *pass, BIGNUM **salt,
|
|
BIGNUM **verifier, BIGNUM *N, BIGNUM *g)
|
|
{
|
|
int result = 0;
|
|
BIGNUM *x = NULL;
|
|
BN_CTX *bn_ctx = BN_CTX_new();
|
|
unsigned char tmp2[MAX_LEN];
|
|
BIGNUM *salttmp = NULL;
|
|
|
|
if ((user == NULL) ||
|
|
(pass == NULL) ||
|
|
(salt == NULL) ||
|
|
(verifier == NULL) || (N == NULL) || (g == NULL) || (bn_ctx == NULL))
|
|
goto err;
|
|
|
|
srp_bn_print(N);
|
|
srp_bn_print(g);
|
|
|
|
if (*salt == NULL) {
|
|
if (RAND_pseudo_bytes(tmp2, SRP_RANDOM_SALT_LEN) < 0)
|
|
goto err;
|
|
|
|
salttmp = BN_bin2bn(tmp2, SRP_RANDOM_SALT_LEN, NULL);
|
|
} else {
|
|
salttmp = *salt;
|
|
}
|
|
|
|
x = SRP_Calc_x(salttmp, user, pass);
|
|
|
|
*verifier = BN_new();
|
|
if (*verifier == NULL)
|
|
goto err;
|
|
|
|
if (!BN_mod_exp(*verifier, g, x, N, bn_ctx)) {
|
|
BN_clear_free(*verifier);
|
|
goto err;
|
|
}
|
|
|
|
srp_bn_print(*verifier);
|
|
|
|
result = 1;
|
|
*salt = salttmp;
|
|
|
|
err:
|
|
if (*salt != salttmp)
|
|
BN_clear_free(salttmp);
|
|
BN_clear_free(x);
|
|
BN_CTX_free(bn_ctx);
|
|
return result;
|
|
}
|
|
|
|
#endif
|