pem_info.c

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/* crypto/pem/pem_info.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * 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 ([email protected]).
 * 
 * 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 ([email protected])"
 *    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 ([email protected])"
 * 
 * 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 "cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#ifndef OPENSSL_NO_RSA
#include <openssl/rsa.h>
#endif
#ifndef OPENSSL_NO_DSA
#include <openssl/dsa.h>
#endif

#ifndef OPENSSL_NO_FP_API
STACK_OF(X509_INFO) *PEM_X509_INFO_read(FILE *fp, STACK_OF(X509_INFO) *sk, pem_password_cb *cb, void *u)
    {
        BIO *b;
        STACK_OF(X509_INFO) *ret;

        if ((b=BIO_new(BIO_s_file())) == NULL)
        {
        PEMerr(PEM_F_PEM_X509_INFO_READ,ERR_R_BUF_LIB);
                return(0);
        }
        BIO_set_fp(b,fp,BIO_NOCLOSE);
        ret=PEM_X509_INFO_read_bio(b,sk,cb,u);
        BIO_free(b);
        return(ret);
    }
#endif

STACK_OF(X509_INFO) *PEM_X509_INFO_read_bio(BIO *bp, STACK_OF(X509_INFO) *sk, pem_password_cb *cb, void *u)
    {
    X509_INFO *xi=NULL;
    char *name=NULL,*header=NULL;
    void *pp;
    unsigned char *data=NULL;
    const unsigned char *p;
    long len,error=0;
    int ok=0;
    STACK_OF(X509_INFO) *ret=NULL;
    unsigned int i,raw,ptype;
    d2i_of_void *d2i = 0;

    if (sk == NULL)
        {
        if ((ret=sk_X509_INFO_new_null()) == NULL)
            {
            PEMerr(PEM_F_PEM_X509_INFO_READ_BIO,ERR_R_MALLOC_FAILURE);
            goto err;
            }
        }
    else
        ret=sk;

    if ((xi=X509_INFO_new()) == NULL) goto err;
    for (;;)
        {
        raw=0;
        ptype = 0;
        i=PEM_read_bio(bp,&name,&header,&data,&len);
        if (i == 0)
            {
            error=ERR_GET_REASON(ERR_peek_last_error());
            if (error == PEM_R_NO_START_LINE)
                {
                ERR_clear_error();
                break;
                }
            goto err;
            }
start:
        if (    (strcmp(name,PEM_STRING_X509) == 0) ||
            (strcmp(name,PEM_STRING_X509_OLD) == 0))
            {
            d2i=(D2I_OF(void))d2i_X509;
            if (xi->x509 != NULL)
                {
                if (!sk_X509_INFO_push(ret,xi)) goto err;
                if ((xi=X509_INFO_new()) == NULL) goto err;
                goto start;
                }
            pp=&(xi->x509);
            }
        else if ((strcmp(name,PEM_STRING_X509_TRUSTED) == 0))
            {
            d2i=(D2I_OF(void))d2i_X509_AUX;
            if (xi->x509 != NULL)
                {
                if (!sk_X509_INFO_push(ret,xi)) goto err;
                if ((xi=X509_INFO_new()) == NULL) goto err;
                goto start;
                }
            pp=&(xi->x509);
            }
        else if (strcmp(name,PEM_STRING_X509_CRL) == 0)
            {
            d2i=(D2I_OF(void))d2i_X509_CRL;
            if (xi->crl != NULL)
                {
                if (!sk_X509_INFO_push(ret,xi)) goto err;
                if ((xi=X509_INFO_new()) == NULL) goto err;
                goto start;
                }
            pp=&(xi->crl);
            }
        else
#ifndef OPENSSL_NO_RSA
            if (strcmp(name,PEM_STRING_RSA) == 0)
            {
            if (xi->x_pkey != NULL) 
                {
                if (!sk_X509_INFO_push(ret,xi)) goto err;
                if ((xi=X509_INFO_new()) == NULL) goto err;
                goto start;
                }

            xi->enc_data=NULL;
            xi->enc_len=0;

            xi->x_pkey=X509_PKEY_new();
            ptype=EVP_PKEY_RSA;
            pp=&xi->x_pkey->dec_pkey;
            if ((int)strlen(header) > 10) /* assume encrypted */
                raw=1;
            }
        else
#endif
#ifndef OPENSSL_NO_DSA
            if (strcmp(name,PEM_STRING_DSA) == 0)
            {
            d2i=(D2I_OF(void))d2i_DSAPrivateKey;
            if (xi->x_pkey != NULL) 
                {
                if (!sk_X509_INFO_push(ret,xi)) goto err;
                if ((xi=X509_INFO_new()) == NULL) goto err;
                goto start;
                }

            xi->enc_data=NULL;
            xi->enc_len=0;

            xi->x_pkey=X509_PKEY_new();
            ptype = EVP_PKEY_DSA;
            pp=&xi->x_pkey->dec_pkey;
            if ((int)strlen(header) > 10) /* assume encrypted */
                raw=1;
            }
        else
#endif
#ifndef OPENSSL_NO_EC
            if (strcmp(name,PEM_STRING_ECPRIVATEKEY) == 0)
            {
                d2i=(D2I_OF(void))d2i_ECPrivateKey;
                if (xi->x_pkey != NULL) 
                {
                    if (!sk_X509_INFO_push(ret,xi)) goto err;
                    if ((xi=X509_INFO_new()) == NULL) goto err;
                        goto start;
                }
 
            xi->enc_data=NULL;
            xi->enc_len=0;
 
            xi->x_pkey=X509_PKEY_new();
            ptype = EVP_PKEY_EC;
            pp=&xi->x_pkey->dec_pkey;
            if ((int)strlen(header) > 10) /* assume encrypted */
                raw=1;
            }
        else
#endif
            {
            d2i=NULL;
            pp=NULL;
            }

        if (d2i != NULL)
            {
            if (!raw)
                {
                EVP_CIPHER_INFO cipher;

                if (!PEM_get_EVP_CIPHER_INFO(header,&cipher))
                    goto err;
                if (!PEM_do_header(&cipher,data,&len,cb,u))
                    goto err;
                p=data;
                if (ptype)
                    {
                    if (!d2i_PrivateKey(ptype, pp, &p, len))
                        {
                        PEMerr(PEM_F_PEM_X509_INFO_READ_BIO,ERR_R_ASN1_LIB);
                        goto err;
                        }
                    }
                else if (d2i(pp,&p,len) == NULL)
                    {
                    PEMerr(PEM_F_PEM_X509_INFO_READ_BIO,ERR_R_ASN1_LIB);
                    goto err;
                    }
                }
            else
                { /* encrypted RSA data */
                if (!PEM_get_EVP_CIPHER_INFO(header,
                    &xi->enc_cipher)) goto err;
                xi->enc_data=(char *)data;
                xi->enc_len=(int)len;
                data=NULL;
                }
            }
        else    {
            /* unknown */
            }
        if (name != NULL) OPENSSL_free(name);
        if (header != NULL) OPENSSL_free(header);
        if (data != NULL) OPENSSL_free(data);
        name=NULL;
        header=NULL;
        data=NULL;
        }

    /* if the last one hasn't been pushed yet and there is anything
     * in it then add it to the stack ... 
     */
    if ((xi->x509 != NULL) || (xi->crl != NULL) ||
        (xi->x_pkey != NULL) || (xi->enc_data != NULL))
        {
        if (!sk_X509_INFO_push(ret,xi)) goto err;
        xi=NULL;
        }
    ok=1;
err:
    if (xi != NULL) X509_INFO_free(xi);
    if (!ok)
        {
        for (i=0; ((int)i)<sk_X509_INFO_num(ret); i++)
            {
            xi=sk_X509_INFO_value(ret,i);
            X509_INFO_free(xi);
            }
        if (ret != sk) sk_X509_INFO_free(ret);
        ret=NULL;
        }
        
    if (name != NULL) OPENSSL_free(name);
    if (header != NULL) OPENSSL_free(header);
    if (data != NULL) OPENSSL_free(data);
    return(ret);
    }


/* A TJH addition */
int PEM_X509_INFO_write_bio(BIO *bp, X509_INFO *xi, EVP_CIPHER *enc,
         unsigned char *kstr, int klen, pem_password_cb *cb, void *u)
    {
    EVP_CIPHER_CTX ctx;
    int i,ret=0;
    unsigned char *data=NULL;
    const char *objstr=NULL;
    char buf[PEM_BUFSIZE];
    unsigned char *iv=NULL;
    
    if (enc != NULL)
        {
        objstr=OBJ_nid2sn(EVP_CIPHER_nid(enc));
        if (objstr == NULL)
            {
            PEMerr(PEM_F_PEM_X509_INFO_WRITE_BIO,PEM_R_UNSUPPORTED_CIPHER);
            goto err;
            }
        }

    /* now for the fun part ... if we have a private key then 
     * we have to be able to handle a not-yet-decrypted key
     * being written out correctly ... if it is decrypted or
     * it is non-encrypted then we use the base code
     */
    if (xi->x_pkey!=NULL)
        {
        if ( (xi->enc_data!=NULL) && (xi->enc_len>0) )
            {
            if (enc == NULL)
                {
                PEMerr(PEM_F_PEM_X509_INFO_WRITE_BIO,PEM_R_CIPHER_IS_NULL);
                goto err;
                }

            /* copy from weirdo names into more normal things */
            iv=xi->enc_cipher.iv;
            data=(unsigned char *)xi->enc_data;
            i=xi->enc_len;

            /* we take the encryption data from the
             * internal stuff rather than what the
             * user has passed us ... as we have to 
             * match exactly for some strange reason
             */
            objstr=OBJ_nid2sn(
                EVP_CIPHER_nid(xi->enc_cipher.cipher));
            if (objstr == NULL)
                {
                PEMerr(PEM_F_PEM_X509_INFO_WRITE_BIO,PEM_R_UNSUPPORTED_CIPHER);
                goto err;
                }

            /* create the right magic header stuff */
            OPENSSL_assert(strlen(objstr)+23+2*enc->iv_len+13 <= sizeof buf);
            buf[0]='\0';
            PEM_proc_type(buf,PEM_TYPE_ENCRYPTED);
            PEM_dek_info(buf,objstr,enc->iv_len,(char *)iv);

            /* use the normal code to write things out */
            i=PEM_write_bio(bp,PEM_STRING_RSA,buf,data,i);
            if (i <= 0) goto err;
            }
        else
            {
            /* Add DSA/DH */
#ifndef OPENSSL_NO_RSA
            /* normal optionally encrypted stuff */
            if (PEM_write_bio_RSAPrivateKey(bp,
                xi->x_pkey->dec_pkey->pkey.rsa,
                enc,kstr,klen,cb,u)<=0)
                goto err;
#endif
            }
        }

    /* if we have a certificate then write it out now */
    if ((xi->x509 != NULL) && (PEM_write_bio_X509(bp,xi->x509) <= 0))
        goto err;

    /* we are ignoring anything else that is loaded into the X509_INFO
     * structure for the moment ... as I don't need it so I'm not
     * coding it here and Eric can do it when this makes it into the
     * base library --tjh
     */

    ret=1;

err:
    OPENSSL_cleanse((char *)&ctx,sizeof(ctx));
    OPENSSL_cleanse(buf,PEM_BUFSIZE);
    return(ret);
    }