659 lines
15 KiB
C
659 lines
15 KiB
C
/* crypto/srp/srp_vfy.c */
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/* Written by Christophe Renou (christophe.renou@edelweb.fr) with
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* the precious help of Peter Sylvester (peter.sylvester@edelweb.fr)
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* for the EdelKey project and contributed to the OpenSSL project 2004.
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*/
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/* ====================================================================
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* Copyright (c) 2004 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#ifndef OPENSSL_NO_SRP
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#include "cryptlib.h"
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#include "srp_lcl.h"
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#include <openssl/srp.h>
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#include <openssl/evp.h>
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#include <openssl/buffer.h>
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#include <openssl/rand.h>
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#include <openssl/txt_db.h>
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#define SRP_RANDOM_SALT_LEN 20
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#define MAX_LEN 2500
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static char b64table[] =
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"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz./";
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/* the following two conversion routines have been inspired by code from Stanford */
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/*
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* Convert a base64 string into raw byte array representation.
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*/
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static int t_fromb64(unsigned char *a, const char *src)
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{
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char *loc;
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int i, j;
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int size;
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while(*src && (*src == ' ' || *src == '\t' || *src == '\n'))
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++src;
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size = strlen(src);
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i = 0;
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while(i < size)
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{
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loc = strchr(b64table, src[i]);
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if(loc == (char *) 0) break;
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else a[i] = loc - b64table;
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++i;
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}
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size = i;
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i = size - 1;
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j = size;
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while(1)
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{
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a[j] = a[i];
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if(--i < 0) break;
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a[j] |= (a[i] & 3) << 6;
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--j;
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a[j] = (unsigned char) ((a[i] & 0x3c) >> 2);
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if(--i < 0) break;
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a[j] |= (a[i] & 0xf) << 4;
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--j;
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a[j] = (unsigned char) ((a[i] & 0x30) >> 4);
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if(--i < 0) break;
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a[j] |= (a[i] << 2);
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a[--j] = 0;
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if(--i < 0) break;
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}
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while(a[j] == 0 && j <= size) ++j;
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i = 0;
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while (j <= size) a[i++] = a[j++];
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return i;
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}
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/*
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* Convert a raw byte string into a null-terminated base64 ASCII string.
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*/
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static char *t_tob64(char *dst, const unsigned char *src, int size)
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{
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int c, pos = size % 3;
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unsigned char b0 = 0, b1 = 0, b2 = 0, notleading = 0;
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char *olddst = dst;
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switch(pos)
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{
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case 1:
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b2 = src[0];
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break;
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case 2:
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b1 = src[0];
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b2 = src[1];
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break;
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}
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while(1)
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{
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c = (b0 & 0xfc) >> 2;
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if(notleading || c != 0)
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{
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*dst++ = b64table[c];
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notleading = 1;
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}
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c = ((b0 & 3) << 4) | ((b1 & 0xf0) >> 4);
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if(notleading || c != 0)
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{
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*dst++ = b64table[c];
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notleading = 1;
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}
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c = ((b1 & 0xf) << 2) | ((b2 & 0xc0) >> 6);
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if(notleading || c != 0)
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{
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*dst++ = b64table[c];
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notleading = 1;
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}
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c = b2 & 0x3f;
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if(notleading || c != 0)
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{
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*dst++ = b64table[c];
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notleading = 1;
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}
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if(pos >= size) break;
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else
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{
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b0 = src[pos++];
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b1 = src[pos++];
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b2 = src[pos++];
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}
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}
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*dst++ = '\0';
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return olddst;
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}
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static void SRP_user_pwd_free(SRP_user_pwd *user_pwd)
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{
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if (user_pwd == NULL)
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return;
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BN_free(user_pwd->s);
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BN_clear_free(user_pwd->v);
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OPENSSL_free(user_pwd->id);
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OPENSSL_free(user_pwd->info);
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OPENSSL_free(user_pwd);
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}
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static SRP_user_pwd *SRP_user_pwd_new()
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{
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SRP_user_pwd *ret = OPENSSL_malloc(sizeof(SRP_user_pwd));
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if (ret == NULL)
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return NULL;
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ret->N = NULL;
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ret->g = NULL;
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ret->s = NULL;
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ret->v = NULL;
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ret->id = NULL ;
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ret->info = NULL;
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return ret;
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}
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static void SRP_user_pwd_set_gN(SRP_user_pwd *vinfo, const BIGNUM *g,
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const BIGNUM *N)
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{
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vinfo->N = N;
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vinfo->g = g;
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}
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static int SRP_user_pwd_set_ids(SRP_user_pwd *vinfo, const char *id,
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const char *info)
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{
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if (id != NULL && NULL == (vinfo->id = BUF_strdup(id)))
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return 0;
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return (info == NULL || NULL != (vinfo->info = BUF_strdup(info))) ;
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}
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static int SRP_user_pwd_set_sv(SRP_user_pwd *vinfo, const char *s,
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const char *v)
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{
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unsigned char tmp[MAX_LEN];
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int len;
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if (strlen(s) > MAX_LEN || strlen(v) > MAX_LEN)
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return 0;
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len = t_fromb64(tmp, v);
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if (NULL == (vinfo->v = BN_bin2bn(tmp, len, NULL)) )
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return 0;
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len = t_fromb64(tmp, s);
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return ((vinfo->s = BN_bin2bn(tmp, len, NULL)) != NULL) ;
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}
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static int SRP_user_pwd_set_sv_BN(SRP_user_pwd *vinfo, BIGNUM *s, BIGNUM *v)
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{
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vinfo->v = v;
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vinfo->s = s;
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return (vinfo->s != NULL && vinfo->v != NULL) ;
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}
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SRP_VBASE *SRP_VBASE_new(char *seed_key)
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{
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SRP_VBASE *vb = (SRP_VBASE *) OPENSSL_malloc(sizeof(SRP_VBASE));
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if (vb == NULL)
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return NULL;
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if (!(vb->users_pwd = sk_SRP_user_pwd_new_null()) ||
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!(vb->gN_cache = sk_SRP_gN_cache_new_null()))
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{
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OPENSSL_free(vb);
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return NULL;
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}
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vb->default_g = NULL;
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vb->default_N = NULL;
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vb->seed_key = NULL;
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if ((seed_key != NULL) &&
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(vb->seed_key = BUF_strdup(seed_key)) == NULL)
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{
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sk_SRP_user_pwd_free(vb->users_pwd);
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sk_SRP_gN_cache_free(vb->gN_cache);
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OPENSSL_free(vb);
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return NULL;
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}
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return vb;
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}
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int SRP_VBASE_free(SRP_VBASE *vb)
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{
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sk_SRP_user_pwd_pop_free(vb->users_pwd,SRP_user_pwd_free);
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sk_SRP_gN_cache_free(vb->gN_cache);
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OPENSSL_free(vb->seed_key);
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OPENSSL_free(vb);
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return 0;
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}
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static SRP_gN_cache *SRP_gN_new_init(const char *ch)
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{
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unsigned char tmp[MAX_LEN];
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int len;
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SRP_gN_cache *newgN = (SRP_gN_cache *)OPENSSL_malloc(sizeof(SRP_gN_cache));
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if (newgN == NULL)
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return NULL;
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if ((newgN->b64_bn = BUF_strdup(ch)) == NULL)
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goto err;
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len = t_fromb64(tmp, ch);
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if ((newgN->bn = BN_bin2bn(tmp, len, NULL)))
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return newgN;
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OPENSSL_free(newgN->b64_bn);
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err:
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OPENSSL_free(newgN);
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return NULL;
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}
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static void SRP_gN_free(SRP_gN_cache *gN_cache)
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{
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if (gN_cache == NULL)
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return;
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OPENSSL_free(gN_cache->b64_bn);
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BN_free(gN_cache->bn);
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OPENSSL_free(gN_cache);
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}
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static SRP_gN *SRP_get_gN_by_id(const char *id, STACK_OF(SRP_gN) *gN_tab)
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{
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int i;
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SRP_gN *gN;
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if (gN_tab != NULL)
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for(i = 0; i < sk_SRP_gN_num(gN_tab); i++)
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{
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gN = sk_SRP_gN_value(gN_tab, i);
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if (gN && (id == NULL || strcmp(gN->id,id)==0))
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return gN;
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}
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return SRP_get_default_gN(id);
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}
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static BIGNUM *SRP_gN_place_bn(STACK_OF(SRP_gN_cache) *gN_cache, char *ch)
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{
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int i;
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if (gN_cache == NULL)
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return NULL;
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/* search if we have already one... */
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for(i = 0; i < sk_SRP_gN_cache_num(gN_cache); i++)
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{
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SRP_gN_cache *cache = sk_SRP_gN_cache_value(gN_cache, i);
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if (strcmp(cache->b64_bn,ch)==0)
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return cache->bn;
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}
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{ /* it is the first time that we find it */
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SRP_gN_cache *newgN = SRP_gN_new_init(ch);
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if (newgN)
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{
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if (sk_SRP_gN_cache_insert(gN_cache,newgN,0)>0)
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return newgN->bn;
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SRP_gN_free(newgN);
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}
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}
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return NULL;
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}
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/* this function parses verifier file. Format is:
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* string(index):base64(N):base64(g):0
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* string(username):base64(v):base64(salt):int(index)
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*/
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int SRP_VBASE_init(SRP_VBASE *vb, char *verifier_file)
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{
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int error_code ;
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STACK_OF(SRP_gN) *SRP_gN_tab = sk_SRP_gN_new_null();
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char *last_index = NULL;
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int i;
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char **pp;
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SRP_gN *gN = NULL;
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SRP_user_pwd *user_pwd = NULL ;
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TXT_DB *tmpdb = NULL;
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BIO *in = BIO_new(BIO_s_file());
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error_code = SRP_ERR_OPEN_FILE;
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if (in == NULL || BIO_read_filename(in,verifier_file) <= 0)
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goto err;
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error_code = SRP_ERR_VBASE_INCOMPLETE_FILE;
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if ((tmpdb =TXT_DB_read(in,DB_NUMBER)) == NULL)
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goto err;
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error_code = SRP_ERR_MEMORY;
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if (vb->seed_key)
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{
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last_index = SRP_get_default_gN(NULL)->id;
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}
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for (i = 0; i < sk_OPENSSL_PSTRING_num(tmpdb->data); i++)
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{
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pp = sk_OPENSSL_PSTRING_value(tmpdb->data,i);
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if (pp[DB_srptype][0] == DB_SRP_INDEX)
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{
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/*we add this couple in the internal Stack */
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if ((gN = (SRP_gN *)OPENSSL_malloc(sizeof(SRP_gN))) == NULL)
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goto err;
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if (!(gN->id = BUF_strdup(pp[DB_srpid]))
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|| !(gN->N = SRP_gN_place_bn(vb->gN_cache,pp[DB_srpverifier]))
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|| !(gN->g = SRP_gN_place_bn(vb->gN_cache,pp[DB_srpsalt]))
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|| sk_SRP_gN_insert(SRP_gN_tab,gN,0) == 0)
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goto err;
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gN = NULL;
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if (vb->seed_key != NULL)
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{
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last_index = pp[DB_srpid];
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}
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}
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else if (pp[DB_srptype][0] == DB_SRP_VALID)
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{
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/* it is a user .... */
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SRP_gN *lgN;
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if ((lgN = SRP_get_gN_by_id(pp[DB_srpgN],SRP_gN_tab))!=NULL)
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{
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error_code = SRP_ERR_MEMORY;
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if ((user_pwd = SRP_user_pwd_new()) == NULL)
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goto err;
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SRP_user_pwd_set_gN(user_pwd,lgN->g,lgN->N);
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if (!SRP_user_pwd_set_ids(user_pwd, pp[DB_srpid],pp[DB_srpinfo]))
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goto err;
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error_code = SRP_ERR_VBASE_BN_LIB;
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if (!SRP_user_pwd_set_sv(user_pwd, pp[DB_srpsalt],pp[DB_srpverifier]))
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goto err;
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if (sk_SRP_user_pwd_insert(vb->users_pwd, user_pwd, 0) == 0)
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goto err;
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user_pwd = NULL; /* abandon responsability */
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}
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}
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}
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if (last_index != NULL)
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{
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/* this means that we want to simulate a default user */
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if (((gN = SRP_get_gN_by_id(last_index,SRP_gN_tab))==NULL))
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{
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error_code = SRP_ERR_VBASE_BN_LIB;
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goto err;
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}
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vb->default_g = gN->g ;
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vb->default_N = gN->N ;
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gN = NULL ;
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}
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error_code = SRP_NO_ERROR;
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err:
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/* there may be still some leaks to fix, if this fails, the application terminates most likely */
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if (gN != NULL)
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{
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OPENSSL_free(gN->id);
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OPENSSL_free(gN);
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}
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SRP_user_pwd_free(user_pwd);
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if (tmpdb) TXT_DB_free(tmpdb);
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if (in) BIO_free_all(in);
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sk_SRP_gN_free(SRP_gN_tab);
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return error_code;
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}
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SRP_user_pwd *SRP_VBASE_get_by_user(SRP_VBASE *vb, char *username)
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{
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int i;
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SRP_user_pwd *user;
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unsigned char digv[SHA_DIGEST_LENGTH];
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unsigned char digs[SHA_DIGEST_LENGTH];
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EVP_MD_CTX ctxt;
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if (vb == NULL)
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return NULL;
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for(i = 0; i < sk_SRP_user_pwd_num(vb->users_pwd); i++)
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{
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user = sk_SRP_user_pwd_value(vb->users_pwd, i);
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if (strcmp(user->id,username)==0)
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return user;
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}
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if ((vb->seed_key == NULL) ||
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(vb->default_g == NULL) ||
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(vb->default_N == NULL))
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return NULL;
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/* if the user is unknown we set parameters as well if we have a seed_key */
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if ((user = SRP_user_pwd_new()) == NULL)
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return NULL;
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SRP_user_pwd_set_gN(user,vb->default_g,vb->default_N);
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if (!SRP_user_pwd_set_ids(user,username,NULL))
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goto err;
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RAND_pseudo_bytes(digv, SHA_DIGEST_LENGTH);
|
|
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;
|
|
char *vf;
|
|
BIGNUM *N_bn = NULL, *g_bn = NULL, *s = NULL, *v = NULL;
|
|
unsigned char tmp[MAX_LEN];
|
|
unsigned char tmp2[MAX_LEN];
|
|
char * defgNid = NULL;
|
|
|
|
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)
|
|
{
|
|
RAND_pseudo_bytes(tmp2, SRP_RANDOM_SALT_LEN);
|
|
|
|
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);
|
|
if (((vf = OPENSSL_malloc(BN_num_bytes(v)*2)) == NULL))
|
|
goto err;
|
|
t_tob64(vf, tmp, BN_num_bytes(v));
|
|
|
|
*verifier = vf;
|
|
if (*salt == NULL)
|
|
{
|
|
char *tmp_salt;
|
|
|
|
if ((tmp_salt = OPENSSL_malloc(SRP_RANDOM_SALT_LEN * 2)) == NULL)
|
|
{
|
|
OPENSSL_free(vf);
|
|
goto err;
|
|
}
|
|
t_tob64(tmp_salt, tmp2, SRP_RANDOM_SALT_LEN);
|
|
*salt = tmp_salt;
|
|
}
|
|
|
|
result=defgNid;
|
|
|
|
err:
|
|
if(N)
|
|
{
|
|
BN_free(N_bn);
|
|
BN_free(g_bn);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
create a verifier (*salt,*verifier,g and N are 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];
|
|
|
|
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)
|
|
{
|
|
RAND_pseudo_bytes(tmp2, SRP_RANDOM_SALT_LEN);
|
|
|
|
*salt = BN_bin2bn(tmp2,SRP_RANDOM_SALT_LEN,NULL);
|
|
}
|
|
|
|
x = SRP_Calc_x(*salt,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;
|
|
|
|
err:
|
|
|
|
BN_clear_free(x);
|
|
BN_CTX_free(bn_ctx);
|
|
return result;
|
|
}
|
|
|
|
|
|
|
|
#endif
|