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Diffstat (limited to 'openssl/crypto/srp/srp_vfy.c')
-rw-r--r--openssl/crypto/srp/srp_vfy.c657
1 files changed, 657 insertions, 0 deletions
diff --git a/openssl/crypto/srp/srp_vfy.c b/openssl/crypto/srp/srp_vfy.c
new file mode 100644
index 000000000..c8be907d7
--- /dev/null
+++ b/openssl/crypto/srp/srp_vfy.c
@@ -0,0 +1,657 @@
+/* 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;
+ }
+ 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;
+ }
+
+static 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) ;
+ }
+
+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 = (char **)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;
+
+ }
+
+
+SRP_user_pwd *SRP_VBASE_get_by_user(SRP_VBASE *vb, char *username)
+ {
+ int i;
+ 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;
+ 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;
+ }
+ 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;
+
+ 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 = (char *)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
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