x509_vfy.c
/* crypto/x509/x509_vfy.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* 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 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 acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <stdio.h>
#include <time.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "crypto.h"
#include "cryptlib.h"
#include "lhash.h"
#include "buffer.h"
#include "evp.h"
#include "asn1.h"
#include "x509.h"
#include "objects.h"
#include "pem.h"
#ifndef NOPROTO
static int null_callback(int ok,X509_STORE_CTX *e);
static int internal_verify(X509_STORE_CTX *ctx);
#else
static int null_callback();
static int internal_verify();
#endif
char *X509_version="X509 part of SSLeay 0.9.0b 29-Jun-1998";
static STACK *x509_store_ctx_method=NULL;
static int x509_store_ctx_num=0;
#if 0
static int x509_store_num=1;
static STACK *x509_store_method=NULL;
#endif
static int null_callback(ok,e)
int ok;
X509_STORE_CTX *e;
{
return(ok);
}
#if 0
static int x509_subject_cmp(a,b)
X509 **a,**b;
{
return(X509_subject_name_cmp(*a,*b));
}
#endif
int X509_verify_cert(ctx)
X509_STORE_CTX *ctx;
{
X509 *x,*xtmp,*chain_ss=NULL;
X509_NAME *xn;
X509_OBJECT obj;
int depth,i,ok=0;
int num;
int (*cb)();
STACK *sktmp=NULL;
if (ctx->cert == NULL)
{
X509err(X509_F_X509_VERIFY_CERT,X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
return(-1);
}
cb=ctx->ctx->verify_cb;
if (cb == NULL) cb=null_callback;
/* first we make sure the chain we are going to build is
* present and that the first entry is in place */
if (ctx->chain == NULL)
{
if ( ((ctx->chain=sk_new_null()) == NULL) ||
(!sk_push(ctx->chain,(char *)ctx->cert)))
{
X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
goto end;
}
CRYPTO_add(&ctx->cert->references,1,CRYPTO_LOCK_X509);
ctx->last_untrusted=1;
}
/* We use a temporary so we can chop and hack at it */
if ((ctx->untrusted != NULL) && (sktmp=sk_dup(ctx->untrusted)) == NULL)
{
X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
goto end;
}
num=sk_num(ctx->chain);
x=(X509 *)sk_value(ctx->chain,num-1);
depth=ctx->depth;
for (;;)
{
/* If we have enough, we break */
if (depth <= num) break;
/* If we are self signed, we break */
xn=X509_get_issuer_name(x);
if (X509_NAME_cmp(X509_get_subject_name(x),xn) == 0)
break;
/* If we were passed a cert chain, use it first */
if (ctx->untrusted != NULL)
{
xtmp=X509_find_by_subject(sktmp,xn);
if (xtmp != NULL)
{
if (!sk_push(ctx->chain,(char *)xtmp))
{
X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
goto end;
}
CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
sk_delete_ptr(sktmp,(char *)xtmp);
ctx->last_untrusted++;
x=xtmp;
num++;
/* reparse the full chain for
* the next one */
continue;
}
}
break;
}
/* at this point, chain should contain a list of untrusted
* certificates. We now need to add at least one trusted one,
* if possible, otherwise we complain. */
i=sk_num(ctx->chain);
x=(X509 *)sk_value(ctx->chain,i-1);
if (X509_NAME_cmp(X509_get_subject_name(x),X509_get_issuer_name(x))
== 0)
{
/* we have a self signed certificate */
if (sk_num(ctx->chain) == 1)
{
ctx->error=X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
ctx->current_cert=x;
ctx->error_depth=i-1;
ok=cb(0,ctx);
if (!ok) goto end;
}
else
{
/* worry more about this one elsewhere */
chain_ss=(X509 *)sk_pop(ctx->chain);
ctx->last_untrusted--;
num--;
x=(X509 *)sk_value(ctx->chain,num-1);
}
}
/* We now lookup certs from the certificate store */
for (;;)
{
/* If we have enough, we break */
if (depth <= num) break;
/* If we are self signed, we break */
xn=X509_get_issuer_name(x);
if (X509_NAME_cmp(X509_get_subject_name(x),xn) == 0)
break;
ok=X509_STORE_get_by_subject(ctx,X509_LU_X509,xn,&obj);
if (ok != X509_LU_X509)
{
if (ok == X509_LU_RETRY)
{
X509_OBJECT_free_contents(&obj);
X509err(X509_F_X509_VERIFY_CERT,X509_R_SHOULD_RETRY);
return(ok);
}
else if (ok != X509_LU_FAIL)
{
X509_OBJECT_free_contents(&obj);
/* not good :-(, break anyway */
return(ok);
}
break;
}
x=obj.data.x509;
if (!sk_push(ctx->chain,(char *)obj.data.x509))
{
X509_OBJECT_free_contents(&obj);
X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
return(0);
}
num++;
}
/* we now have our chain, lets check it... */
xn=X509_get_issuer_name(x);
if (X509_NAME_cmp(X509_get_subject_name(x),xn) != 0)
{
if ((chain_ss == NULL) || (X509_NAME_cmp(X509_get_subject_name(chain_ss),xn) != 0))
{
if (ctx->last_untrusted >= num)
ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
else
ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
ctx->current_cert=x;
}
else
{
sk_push(ctx->chain,(char *)chain_ss);
num++;
ctx->last_untrusted=num;
ctx->current_cert=chain_ss;
ctx->error=X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
chain_ss=NULL;
}
ctx->error_depth=num-1;
ok=cb(0,ctx);
if (!ok) goto end;
}
/* We may as well copy down any DSA parameters that are required */
X509_get_pubkey_parameters(NULL,ctx->chain);
/* At this point, we have a chain and just need to verify it */
if (ctx->ctx->verify != NULL)
ok=ctx->ctx->verify(ctx);
else
ok=internal_verify(ctx);
end:
if (sktmp != NULL) sk_free(sktmp);
if (chain_ss != NULL) X509_free(chain_ss);
return(ok);
}
static int internal_verify(ctx)
X509_STORE_CTX *ctx;
{
int i,ok=0,n;
X509 *xs,*xi;
EVP_PKEY *pkey=NULL;
int (*cb)();
cb=ctx->ctx->verify_cb;
if (cb == NULL) cb=null_callback;
n=sk_num(ctx->chain);
ctx->error_depth=n-1;
n--;
xi=(X509 *)sk_value(ctx->chain,n);
if (X509_NAME_cmp(X509_get_subject_name(xi),
X509_get_issuer_name(xi)) == 0)
xs=xi;
else
{
if (n <= 0)
{
ctx->error=X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
ctx->current_cert=xi;
ok=cb(0,ctx);
goto end;
}
else
{
n--;
ctx->error_depth=n;
xs=(X509 *)sk_value(ctx->chain,n);
}
}
/* ctx->error=0; not needed */
while (n >= 0)
{
ctx->error_depth=n;
if (!xs->valid)
{
if ((pkey=X509_get_pubkey(xi)) == NULL)
{
ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
ctx->current_cert=xi;
ok=(*cb)(0,ctx);
if (!ok) goto end;
}
if (X509_verify(xs,pkey) <= 0)
{
ctx->error=X509_V_ERR_CERT_SIGNATURE_FAILURE;
ctx->current_cert=xs;
ok=(*cb)(0,ctx);
if (!ok) goto end;
}
pkey=NULL;
i=X509_cmp_current_time(X509_get_notBefore(xs));
if (i == 0)
{
ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
ctx->current_cert=xs;
ok=(*cb)(0,ctx);
if (!ok) goto end;
}
if (i > 0)
{
ctx->error=X509_V_ERR_CERT_NOT_YET_VALID;
ctx->current_cert=xs;
ok=(*cb)(0,ctx);
if (!ok) goto end;
}
xs->valid=1;
}
i=X509_cmp_current_time(X509_get_notAfter(xs));
if (i == 0)
{
ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
ctx->current_cert=xs;
ok=(*cb)(0,ctx);
if (!ok) goto end;
}
if (i < 0)
{
ctx->error=X509_V_ERR_CERT_HAS_EXPIRED;
ctx->current_cert=xs;
ok=(*cb)(0,ctx);
if (!ok) goto end;
}
/* CRL CHECK */
/* The last error (if any) is still in the error value */
ctx->current_cert=xs;
ok=(*cb)(1,ctx);
if (!ok) goto end;
n--;
if (n >= 0)
{
xi=xs;
xs=(X509 *)sk_value(ctx->chain,n);
}
}
ok=1;
end:
return(ok);
}
int X509_cmp_current_time(ctm)
ASN1_UTCTIME *ctm;
{
char *str;
ASN1_UTCTIME atm;
time_t offset;
char buff1[24],buff2[24],*p;
int i,j;
p=buff1;
i=ctm->length;
str=(char *)ctm->data;
if ((i < 11) || (i > 17)) return(0);
memcpy(p,str,10);
p+=10;
str+=10;
if ((*str == 'Z') || (*str == '-') || (*str == '+'))
{ *(p++)='0'; *(p++)='0'; }
else { *(p++)= *(str++); *(p++)= *(str++); }
*(p++)='Z';
*(p++)='\0';
if (*str == 'Z')
offset=0;
else
{
if ((*str != '+') && (str[5] != '-'))
return(0);
offset=((str[1]-'0')*10+(str[2]-'0'))*60;
offset+=(str[3]-'0')*10+(str[4]-'0');
if (*str == '-')
offset=-offset;
}
atm.type=V_ASN1_UTCTIME;
atm.length=sizeof(buff2);
atm.data=(unsigned char *)buff2;
X509_gmtime_adj(&atm,-offset);
i=(buff1[0]-'0')*10+(buff1[1]-'0');
if (i < 70) i+=100;
j=(buff2[0]-'0')*10+(buff2[1]-'0');
if (j < 70) j+=100;
if (i < j) return (-1);
if (i > j) return (1);
i=strcmp(buff1,buff2);
if (i == 0) /* wait a second then return younger :-) */
return(-1);
else
return(i);
}
ASN1_UTCTIME *X509_gmtime_adj(s, adj)
ASN1_UTCTIME *s;
long adj;
{
time_t t;
time(&t);
t+=adj;
return(ASN1_UTCTIME_set(s,t));
}
int X509_get_pubkey_parameters(pkey,chain)
EVP_PKEY *pkey;
STACK *chain;
{
EVP_PKEY *ktmp=NULL,*ktmp2;
int i,j;
if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey)) return(1);
for (i=0; i<sk_num(chain); i++)
{
ktmp=X509_get_pubkey((X509 *)sk_value(chain,i));
if (ktmp == NULL)
{
X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
return(0);
}
if (!EVP_PKEY_missing_parameters(ktmp))
break;
else
{
ktmp=NULL;
}
}
if (ktmp == NULL)
{
X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
return(0);
}
/* first, populate the other certs */
for (j=i-1; j >= 0; j--)
{
ktmp2=X509_get_pubkey((X509 *)sk_value(chain,j));
EVP_PKEY_copy_parameters(ktmp2,ktmp);
}
if (pkey != NULL)
EVP_PKEY_copy_parameters(pkey,ktmp);
return(1);
}
EVP_PKEY *X509_get_pubkey(x)
X509 *x;
{
if ((x == NULL) || (x->cert_info == NULL))
return(NULL);
return(X509_PUBKEY_get(x->cert_info->key));
}
int X509_check_private_key(x,k)
X509 *x;
EVP_PKEY *k;
{
EVP_PKEY *xk=NULL;
int ok=0;
xk=X509_get_pubkey(x);
if (xk->type != k->type) goto err;
switch (k->type)
{
#ifndef NO_RSA
case EVP_PKEY_RSA:
if (BN_cmp(xk->pkey.rsa->n,k->pkey.rsa->n) != 0) goto err;
if (BN_cmp(xk->pkey.rsa->e,k->pkey.rsa->e) != 0) goto err;
break;
#endif
#ifndef NO_DSA
case EVP_PKEY_DSA:
if (BN_cmp(xk->pkey.dsa->pub_key,k->pkey.dsa->pub_key) != 0)
goto err;
break;
#endif
#ifndef NO_DH
case EVP_PKEY_DH:
/* No idea */
goto err;
#endif
default:
goto err;
}
ok=1;
err:
return(ok);
}
int X509_STORE_add_cert(ctx,x)
X509_STORE *ctx;
X509 *x;
{
X509_OBJECT *obj,*r;
int ret=1;
if (x == NULL) return(0);
obj=(X509_OBJECT *)Malloc(sizeof(X509_OBJECT));
if (obj == NULL)
{
X509err(X509_F_X509_STORE_ADD_CERT,ERR_R_MALLOC_FAILURE);
return(0);
}
obj->type=X509_LU_X509;
obj->data.x509=x;
CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
X509_OBJECT_up_ref_count(obj);
r=(X509_OBJECT *)lh_insert(ctx->certs,(char *)obj);
if (r != NULL)
{ /* oops, put it back */
lh_delete(ctx->certs,(char *)obj);
X509_OBJECT_free_contents(obj);
Free(obj);
lh_insert(ctx->certs,(char *)r);
X509err(X509_F_X509_STORE_ADD_CERT,X509_R_CERT_ALREADY_IN_HASH_TABLE);
ret=0;
}
CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
return(ret);
}
int X509_STORE_add_crl(ctx,x)
X509_STORE *ctx;
X509_CRL *x;
{
X509_OBJECT *obj,*r;
int ret=1;
if (x == NULL) return(0);
obj=(X509_OBJECT *)Malloc(sizeof(X509_OBJECT));
if (obj == NULL)
{
X509err(X509_F_X509_STORE_ADD_CRL,ERR_R_MALLOC_FAILURE);
return(0);
}
obj->type=X509_LU_CRL;
obj->data.crl=x;
CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
X509_OBJECT_up_ref_count(obj);
r=(X509_OBJECT *)lh_insert(ctx->certs,(char *)obj);
if (r != NULL)
{ /* oops, put it back */
lh_delete(ctx->certs,(char *)obj);
X509_OBJECT_free_contents(obj);
Free(obj);
lh_insert(ctx->certs,(char *)r);
X509err(X509_F_X509_STORE_ADD_CRL,X509_R_CERT_ALREADY_IN_HASH_TABLE);
ret=0;
}
CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
return(ret);
}
int X509_STORE_CTX_get_ex_new_index(argl,argp,new_func,dup_func,free_func)
long argl;
char *argp;
int (*new_func)();
int (*dup_func)();
void (*free_func)();
{
x509_store_ctx_num++;
return(CRYPTO_get_ex_new_index(x509_store_ctx_num-1,
&x509_store_ctx_method,
argl,argp,new_func,dup_func,free_func));
}
int X509_STORE_CTX_set_ex_data(ctx,idx,data)
X509_STORE_CTX *ctx;
int idx;
char *data;
{
return(CRYPTO_set_ex_data(&ctx->ex_data,idx,data));
}
char *X509_STORE_CTX_get_ex_data(ctx,idx)
X509_STORE_CTX *ctx;
int idx;
{
return(CRYPTO_get_ex_data(&ctx->ex_data,idx));
}
int X509_STORE_CTX_get_error(ctx)
X509_STORE_CTX *ctx;
{
return(ctx->error);
}
void X509_STORE_CTX_set_error(ctx,err)
X509_STORE_CTX *ctx;
int err;
{
ctx->error=err;
}
int X509_STORE_CTX_get_error_depth(ctx)
X509_STORE_CTX *ctx;
{
return(ctx->error_depth);
}
X509 *X509_STORE_CTX_get_current_cert(ctx)
X509_STORE_CTX *ctx;
{
return(ctx->current_cert);
}
STACK *X509_STORE_CTX_get_chain(ctx)
X509_STORE_CTX *ctx;
{
return(ctx->chain);
}
void X509_STORE_CTX_set_cert(ctx,x)
X509_STORE_CTX *ctx;
X509 *x;
{
ctx->cert=x;
}
void X509_STORE_CTX_set_chain(ctx,sk)
X509_STORE_CTX *ctx;
STACK *sk;
{
ctx->untrusted=sk;
}
