/* $OpenBSD: pem_info.c,v 1.25 2021/12/12 21:30:14 tb Exp $ */
/* 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 <string.h>

#include <openssl/opensslconf.h>

#include <openssl/buffer.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/pem.h>
#include <openssl/x509.h>

#ifndef OPENSSL_NO_DSA
#include <openssl/dsa.h>
#endif
#ifndef OPENSSL_NO_RSA
#include <openssl/rsa.h>
#endif

#include "evp_locl.h"

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) {
                PEMerror(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);
}

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;
        int ok = 0;
        int num_in, ptype, raw;
        STACK_OF(X509_INFO) *ret = sk;
        d2i_of_void *d2i = NULL;

        if (ret == NULL) {
                if ((ret = sk_X509_INFO_new_null()) == NULL) {
                        PEMerror(ERR_R_MALLOC_FAILURE);
                        return NULL;
                }
        }
        num_in = sk_X509_INFO_num(ret);

        if ((xi = X509_INFO_new()) == NULL)
                goto err;
        for (;;) {
                raw = 0;
                ptype = 0;
                if (!PEM_read_bio(bp, &name, &header, &data, &len)) {
                        if (ERR_GET_REASON(ERR_peek_last_error()) ==
                            PEM_R_NO_START_LINE) {
                                ERR_clear_error();
                                break;
                        }
                        goto err;
                }
                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;
                        }
                        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;
                        }
                        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;
                        }
                        pp = &(xi->crl);
                } else
#ifndef OPENSSL_NO_RSA
                if (strcmp(name, PEM_STRING_RSA) == 0) {
                        d2i = (D2I_OF(void))d2i_RSAPrivateKey;
                        if (xi->x_pkey != NULL) {
                                if (!sk_X509_INFO_push(ret, xi))
                                        goto err;
                                if ((xi = X509_INFO_new()) == NULL)
                                        goto err;
                        }
                        xi->enc_data = NULL;
                        xi->enc_len = 0;
                        xi->x_pkey = X509_PKEY_new();
                        if (xi->x_pkey == NULL)
                                goto err;
                        ptype = EVP_PKEY_RSA;
                        pp = &xi->x_pkey->dec_pkey;
                        if (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;
                        }
                        xi->enc_data = NULL;
                        xi->enc_len = 0;
                        xi->x_pkey = X509_PKEY_new();
                        if (xi->x_pkey == NULL)
                                goto err;
                        ptype = EVP_PKEY_DSA;
                        pp = &xi->x_pkey->dec_pkey;
                        if (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;
                        }
                        xi->enc_data = NULL;
                        xi->enc_len = 0;
                        xi->x_pkey = X509_PKEY_new();
                        if (xi->x_pkey == NULL)
                                goto err;
                        ptype = EVP_PKEY_EC;
                        pp = &xi->x_pkey->dec_pkey;
                        if (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)) {
                                                PEMerror(ERR_R_ASN1_LIB);
                                                goto err;
                                        }
                                } else if (d2i(pp, &p, len) == NULL) {
                                        PEMerror(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 */
                }
                free(name);
                free(header);
                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 (!ok) {
                while (sk_X509_INFO_num(ret) > num_in)
                        X509_INFO_free(sk_X509_INFO_pop(ret));
                if (ret != sk)
                        sk_X509_INFO_free(ret);
                ret = NULL;
        }
        X509_INFO_free(xi);
        free(name);
        free(header);
        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) {
                        PEMerror(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) {
                                PEMerror(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) {
                                PEMerror(PEM_R_UNSUPPORTED_CIPHER);
                                goto err;
                        }

                        /* create the right magic header stuff */
                        if (strlen(objstr) + 23 + 2 * enc->iv_len + 13 >
                            sizeof buf) {
                                PEMerror(ASN1_R_BUFFER_TOO_SMALL);
                                goto err;
                        }
                        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:
        explicit_bzero((char *)&ctx, sizeof(ctx));
        explicit_bzero(buf, PEM_BUFSIZE);
        return (ret);
}