/* $OpenBSD: pk7_lib.c,v 1.31 2025/05/10 05:54:38 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 <openssl/objects.h>
#include <openssl/x509.h>

#include "asn1_local.h"
#include "err_local.h"
#include "evp_local.h"
#include "x509_local.h"

long
PKCS7_ctrl(PKCS7 *p7, int cmd, long larg, char *parg)
{
        int nid;
        long ret = 0;

        nid = OBJ_obj2nid(p7->type);

        switch (cmd) {
        case PKCS7_OP_SET_DETACHED_SIGNATURE:
                if (nid == NID_pkcs7_signed) {
                        if (p7->d.sign == NULL) {
                                PKCS7error(PKCS7_R_NO_CONTENT);
                                break;
                        }
                        ret = p7->detached = (int)larg;
                        if (ret && PKCS7_type_is_data(p7->d.sign->contents)) {
                                ASN1_OCTET_STRING *os;
                                os = p7->d.sign->contents->d.data;
                                ASN1_OCTET_STRING_free(os);
                                p7->d.sign->contents->d.data = NULL;
                        }
                } else {
                        PKCS7error(PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);
                        ret = 0;
                }
                break;
        case PKCS7_OP_GET_DETACHED_SIGNATURE:
                if (nid == NID_pkcs7_signed) {
                        if (p7->d.sign == NULL ||
                            p7->d.sign->contents->d.ptr == NULL)
                                ret = 1;
                        else
                                ret = 0;

                        p7->detached = ret;
                } else {
                        PKCS7error(PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);
                        ret = 0;
                }

                break;
        default:
                PKCS7error(PKCS7_R_UNKNOWN_OPERATION);
                ret = 0;
        }
        return (ret);
}
LCRYPTO_ALIAS(PKCS7_ctrl);

int
PKCS7_content_new(PKCS7 *p7, int type)
{
        PKCS7 *ret = NULL;

        if ((ret = PKCS7_new()) == NULL)
                goto err;
        if (!PKCS7_set_type(ret, type))
                goto err;
        if (!PKCS7_set_content(p7, ret))
                goto err;

        return (1);
err:
        if (ret != NULL)
                PKCS7_free(ret);
        return (0);
}
LCRYPTO_ALIAS(PKCS7_content_new);

int
PKCS7_set_content(PKCS7 *p7, PKCS7 *p7_data)
{
        int i;

        i = OBJ_obj2nid(p7->type);
        switch (i) {
        case NID_pkcs7_signed:
                if (p7->d.sign->contents != NULL)
                        PKCS7_free(p7->d.sign->contents);
                p7->d.sign->contents = p7_data;
                break;
        case NID_pkcs7_digest:
                if (p7->d.digest->contents != NULL)
                        PKCS7_free(p7->d.digest->contents);
                p7->d.digest->contents = p7_data;
                break;
        case NID_pkcs7_data:
        case NID_pkcs7_enveloped:
        case NID_pkcs7_signedAndEnveloped:
        case NID_pkcs7_encrypted:
        default:
                PKCS7error(PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
                goto err;
        }
        return (1);
err:
        return (0);
}
LCRYPTO_ALIAS(PKCS7_set_content);

int
PKCS7_set_type(PKCS7 *p7, int type)
{
        ASN1_OBJECT *obj;

        /*PKCS7_content_free(p7);*/
        obj=OBJ_nid2obj(type); /* will not fail */

        switch (type) {
        case NID_pkcs7_signed:
                p7->type = obj;
                if ((p7->d.sign = PKCS7_SIGNED_new()) == NULL)
                        goto err;
                if (!ASN1_INTEGER_set(p7->d.sign->version, 1)) {
                        PKCS7_SIGNED_free(p7->d.sign);
                        p7->d.sign = NULL;
                        goto err;
                }
                break;
        case NID_pkcs7_data:
                p7->type = obj;
                if ((p7->d.data = ASN1_OCTET_STRING_new()) == NULL)
                        goto err;
                break;
        case NID_pkcs7_signedAndEnveloped:
                p7->type = obj;
                if ((p7->d.signed_and_enveloped =
                    PKCS7_SIGN_ENVELOPE_new()) == NULL)
                        goto err;
                if (!ASN1_INTEGER_set(p7->d.signed_and_enveloped->version, 1))
                        goto err;
                p7->d.signed_and_enveloped->enc_data->content_type =
                    OBJ_nid2obj(NID_pkcs7_data);
                break;
        case NID_pkcs7_enveloped:
                p7->type = obj;
                if ((p7->d.enveloped = PKCS7_ENVELOPE_new()) == NULL)
                        goto err;
                if (!ASN1_INTEGER_set(p7->d.enveloped->version, 0))
                        goto err;
                p7->d.enveloped->enc_data->content_type =
                    OBJ_nid2obj(NID_pkcs7_data);
                break;
        case NID_pkcs7_encrypted:
                p7->type = obj;
                if ((p7->d.encrypted = PKCS7_ENCRYPT_new()) == NULL)
                        goto err;
                if (!ASN1_INTEGER_set(p7->d.encrypted->version, 0))
                        goto err;
                p7->d.encrypted->enc_data->content_type =
                    OBJ_nid2obj(NID_pkcs7_data);
                break;

        case NID_pkcs7_digest:
                p7->type = obj;
                if ((p7->d.digest = PKCS7_DIGEST_new()) == NULL)
                        goto err;
                if (!ASN1_INTEGER_set(p7->d.digest->version, 0))
                        goto err;
                break;
        default:
                PKCS7error(PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
                goto err;
        }
        return (1);
err:
        return (0);
}
LCRYPTO_ALIAS(PKCS7_set_type);

int
PKCS7_set0_type_other(PKCS7 *p7, int type, ASN1_TYPE *other)
{
        p7->type = OBJ_nid2obj(type);
        p7->d.other = other;
        return 1;
}
LCRYPTO_ALIAS(PKCS7_set0_type_other);

int
PKCS7_add_signer(PKCS7 *p7, PKCS7_SIGNER_INFO *psi)
{
        int i, j, nid;
        X509_ALGOR *alg;
        STACK_OF(PKCS7_SIGNER_INFO) *signer_sk;
        STACK_OF(X509_ALGOR) *md_sk;

        i = OBJ_obj2nid(p7->type);
        switch (i) {
        case NID_pkcs7_signed:
                signer_sk = p7->d.sign->signer_info;
                md_sk = p7->d.sign->md_algs;
                break;
        case NID_pkcs7_signedAndEnveloped:
                signer_sk = p7->d.signed_and_enveloped->signer_info;
                md_sk = p7->d.signed_and_enveloped->md_algs;
                break;
        default:
                PKCS7error(PKCS7_R_WRONG_CONTENT_TYPE);
                return (0);
        }

        nid = OBJ_obj2nid(psi->digest_alg->algorithm);

        /* If the digest is not currently listed, add it */
        j = 0;
        for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
                alg = sk_X509_ALGOR_value(md_sk, i);
                if (OBJ_obj2nid(alg->algorithm) == nid) {
                        j = 1;
                        break;
                }
        }
        if (!j) /* we need to add another algorithm */
        {
                if (!(alg = X509_ALGOR_new()) ||
                    !(alg->parameter = ASN1_TYPE_new())) {
                        X509_ALGOR_free(alg);
                        PKCS7error(ERR_R_MALLOC_FAILURE);
                        return (0);
                }
                alg->algorithm = OBJ_nid2obj(nid);
                alg->parameter->type = V_ASN1_NULL;
                if (!sk_X509_ALGOR_push(md_sk, alg)) {
                        X509_ALGOR_free(alg);
                        return 0;
                }
        }

        if (!sk_PKCS7_SIGNER_INFO_push(signer_sk, psi))
                return 0;
        return (1);
}
LCRYPTO_ALIAS(PKCS7_add_signer);

int
PKCS7_add_certificate(PKCS7 *p7, X509 *x509)
{
        int i;
        STACK_OF(X509) **sk;

        i = OBJ_obj2nid(p7->type);
        switch (i) {
        case NID_pkcs7_signed:
                sk = &(p7->d.sign->cert);
                break;
        case NID_pkcs7_signedAndEnveloped:
                sk = &(p7->d.signed_and_enveloped->cert);
                break;
        default:
                PKCS7error(PKCS7_R_WRONG_CONTENT_TYPE);
                return (0);
        }

        if (*sk == NULL)
                *sk = sk_X509_new_null();
        if (*sk == NULL) {
                PKCS7error(ERR_R_MALLOC_FAILURE);
                return 0;
        }
        CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509);
        if (!sk_X509_push(*sk, x509)) {
                X509_free(x509);
                return 0;
        }
        return (1);
}
LCRYPTO_ALIAS(PKCS7_add_certificate);

int
PKCS7_add_crl(PKCS7 *p7, X509_CRL *crl)
{
        int i;
        STACK_OF(X509_CRL) **sk;

        i = OBJ_obj2nid(p7->type);
        switch (i) {
        case NID_pkcs7_signed:
                sk = &(p7->d.sign->crl);
                break;
        case NID_pkcs7_signedAndEnveloped:
                sk = &(p7->d.signed_and_enveloped->crl);
                break;
        default:
                PKCS7error(PKCS7_R_WRONG_CONTENT_TYPE);
                return (0);
        }

        if (*sk == NULL)
                *sk = sk_X509_CRL_new_null();
        if (*sk == NULL) {
                PKCS7error(ERR_R_MALLOC_FAILURE);
                return 0;
        }

        CRYPTO_add(&crl->references, 1, CRYPTO_LOCK_X509_CRL);
        if (!sk_X509_CRL_push(*sk, crl)) {
                X509_CRL_free(crl);
                return 0;
        }
        return (1);
}
LCRYPTO_ALIAS(PKCS7_add_crl);

int
PKCS7_SIGNER_INFO_set(PKCS7_SIGNER_INFO *p7i, X509 *x509, EVP_PKEY *pkey,
    const EVP_MD *dgst)
{
        int nid;
        int ret;

        /* We now need to add another PKCS7_SIGNER_INFO entry */
        if (!ASN1_INTEGER_set(p7i->version, 1))
                goto err;
        if (!X509_NAME_set(&p7i->issuer_and_serial->issuer,
            X509_get_issuer_name(x509)))
                goto err;

        /* because ASN1_INTEGER_set is used to set a 'long' we will do
         * things the ugly way. */
        ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
        if (!(p7i->issuer_and_serial->serial =
            ASN1_INTEGER_dup(X509_get_serialNumber(x509))))
                goto err;

        /* lets keep the pkey around for a while */
        CRYPTO_add(&pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
        p7i->pkey = pkey;

        /*
         * Do not use X509_ALGOR_set_evp_md() to match historical behavior.
         * A mistranslation of the ASN.1 from 1988 to 1997 syntax lost the
         * OPTIONAL field, cf. the NOTE above RFC 5754, 2.1.
         * Using X509_ALGOR_set_evp_md() would change encoding of the SHAs.
         */
        nid = EVP_MD_type(dgst);
        if (!X509_ALGOR_set0_by_nid(p7i->digest_alg, nid, V_ASN1_NULL, NULL))
                return 0;

        if (pkey->ameth && pkey->ameth->pkey_ctrl) {
                ret = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_PKCS7_SIGN,
                    0, p7i);
                if (ret > 0)
                        return 1;
                if (ret != -2) {
                        PKCS7error(PKCS7_R_SIGNING_CTRL_FAILURE);
                        return 0;
                }
        }
        PKCS7error(PKCS7_R_SIGNING_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
err:
        return 0;
}
LCRYPTO_ALIAS(PKCS7_SIGNER_INFO_set);

PKCS7_SIGNER_INFO *
PKCS7_add_signature(PKCS7 *p7, X509 *x509, EVP_PKEY *pkey, const EVP_MD *dgst)
{
        PKCS7_SIGNER_INFO *si = NULL;

        if (dgst == NULL) {
                int def_nid;
                if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) <= 0)
                        goto err;
                dgst = EVP_get_digestbynid(def_nid);
                if (dgst == NULL) {
                        PKCS7error(PKCS7_R_NO_DEFAULT_DIGEST);
                        goto err;
                }
        }

        if ((si = PKCS7_SIGNER_INFO_new()) == NULL)
                goto err;
        if (!PKCS7_SIGNER_INFO_set(si, x509, pkey, dgst))
                goto err;
        if (!PKCS7_add_signer(p7, si))
                goto err;
        return (si);
err:
        if (si)
                PKCS7_SIGNER_INFO_free(si);
        return (NULL);
}
LCRYPTO_ALIAS(PKCS7_add_signature);

int
PKCS7_set_digest(PKCS7 *p7, const EVP_MD *md)
{
        if (PKCS7_type_is_digest(p7)) {
                if (!(p7->d.digest->md->parameter = ASN1_TYPE_new())) {
                        PKCS7error(ERR_R_MALLOC_FAILURE);
                        return 0;
                }
                p7->d.digest->md->parameter->type = V_ASN1_NULL;
                p7->d.digest->md->algorithm = OBJ_nid2obj(EVP_MD_nid(md));
                return 1;
        }

        PKCS7error(PKCS7_R_WRONG_CONTENT_TYPE);
        return 1;
}
LCRYPTO_ALIAS(PKCS7_set_digest);

STACK_OF(PKCS7_SIGNER_INFO) *
PKCS7_get_signer_info(PKCS7 *p7)
{
        if (p7 == NULL || p7->d.ptr == NULL)
                return (NULL);
        if (PKCS7_type_is_signed(p7)) {
                return (p7->d.sign->signer_info);
        } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
                return (p7->d.signed_and_enveloped->signer_info);
        } else
                return (NULL);
}
LCRYPTO_ALIAS(PKCS7_get_signer_info);

void
PKCS7_SIGNER_INFO_get0_algs(PKCS7_SIGNER_INFO *si, EVP_PKEY **pk,
    X509_ALGOR **pdig, X509_ALGOR **psig)
{
        if (pk)
                *pk = si->pkey;
        if (pdig)
                *pdig = si->digest_alg;
        if (psig)
                *psig = si->digest_enc_alg;
}
LCRYPTO_ALIAS(PKCS7_SIGNER_INFO_get0_algs);

void
PKCS7_RECIP_INFO_get0_alg(PKCS7_RECIP_INFO *ri, X509_ALGOR **penc)
{
        if (penc)
                *penc = ri->key_enc_algor;
}
LCRYPTO_ALIAS(PKCS7_RECIP_INFO_get0_alg);

PKCS7_RECIP_INFO *
PKCS7_add_recipient(PKCS7 *p7, X509 *x509)
{
        PKCS7_RECIP_INFO *ri;

        if ((ri = PKCS7_RECIP_INFO_new()) == NULL)
                goto err;
        if (!PKCS7_RECIP_INFO_set(ri, x509))
                goto err;
        if (!PKCS7_add_recipient_info(p7, ri))
                goto err;
        return ri;
err:
        if (ri)
                PKCS7_RECIP_INFO_free(ri);
        return NULL;
}
LCRYPTO_ALIAS(PKCS7_add_recipient);

int
PKCS7_add_recipient_info(PKCS7 *p7, PKCS7_RECIP_INFO *ri)
{
        int i;
        STACK_OF(PKCS7_RECIP_INFO) *sk;

        i = OBJ_obj2nid(p7->type);
        switch (i) {
        case NID_pkcs7_signedAndEnveloped:
                sk = p7->d.signed_and_enveloped->recipientinfo;
                break;
        case NID_pkcs7_enveloped:
                sk = p7->d.enveloped->recipientinfo;
                break;
        default:
                PKCS7error(PKCS7_R_WRONG_CONTENT_TYPE);
                return (0);
        }

        if (!sk_PKCS7_RECIP_INFO_push(sk, ri))
                return 0;
        return (1);
}
LCRYPTO_ALIAS(PKCS7_add_recipient_info);

int
PKCS7_RECIP_INFO_set(PKCS7_RECIP_INFO *p7i, X509 *x509)
{
        int ret;
        EVP_PKEY *pkey = NULL;
        if (!ASN1_INTEGER_set(p7i->version, 0))
                return 0;
        if (!X509_NAME_set(&p7i->issuer_and_serial->issuer,
            X509_get_issuer_name(x509)))
                return 0;

        ASN1_INTEGER_free(p7i->issuer_and_serial->serial);
        if (!(p7i->issuer_and_serial->serial =
            ASN1_INTEGER_dup(X509_get_serialNumber(x509))))
                return 0;

        pkey = X509_get_pubkey(x509);

        if (!pkey || !pkey->ameth || !pkey->ameth->pkey_ctrl) {
                PKCS7error(PKCS7_R_ENCRYPTION_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
                goto err;
        }

        ret = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_PKCS7_ENCRYPT,
            0, p7i);
        if (ret == -2) {
                PKCS7error(PKCS7_R_ENCRYPTION_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
                goto err;
        }
        if (ret <= 0) {
                PKCS7error(PKCS7_R_ENCRYPTION_CTRL_FAILURE);
                goto err;
        }

        EVP_PKEY_free(pkey);

        CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509);
        p7i->cert = x509;

        return 1;

err:
        EVP_PKEY_free(pkey);
        return 0;
}
LCRYPTO_ALIAS(PKCS7_RECIP_INFO_set);

X509 *
PKCS7_cert_from_signer_info(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
{
        if (PKCS7_type_is_signed(p7))
                return(X509_find_by_issuer_and_serial(p7->d.sign->cert,
                    si->issuer_and_serial->issuer,
                    si->issuer_and_serial->serial));
        else
                return (NULL);
}
LCRYPTO_ALIAS(PKCS7_cert_from_signer_info);

int
PKCS7_set_cipher(PKCS7 *p7, const EVP_CIPHER *cipher)
{
        int i;
        PKCS7_ENC_CONTENT *ec;

        i = OBJ_obj2nid(p7->type);
        switch (i) {
        case NID_pkcs7_signedAndEnveloped:
                ec = p7->d.signed_and_enveloped->enc_data;
                break;
        case NID_pkcs7_enveloped:
                ec = p7->d.enveloped->enc_data;
                break;
        default:
                PKCS7error(PKCS7_R_WRONG_CONTENT_TYPE);
                return (0);
        }

        /* Check cipher OID exists and has data in it*/
        i = EVP_CIPHER_type(cipher);
        if (i == NID_undef) {
                PKCS7error(PKCS7_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
                return (0);
        }

        ec->cipher = cipher;
        return 1;
}
LCRYPTO_ALIAS(PKCS7_set_cipher);

int
PKCS7_stream(unsigned char ***boundary, PKCS7 *p7)
{
        ASN1_OCTET_STRING *os = NULL;

        switch (OBJ_obj2nid(p7->type)) {
        case NID_pkcs7_data:
                os = p7->d.data;
                break;

        case NID_pkcs7_signedAndEnveloped:
                os = p7->d.signed_and_enveloped->enc_data->enc_data;
                if (os == NULL) {
                        os = ASN1_OCTET_STRING_new();
                        p7->d.signed_and_enveloped->enc_data->enc_data = os;
                }
                break;

        case NID_pkcs7_enveloped:
                os = p7->d.enveloped->enc_data->enc_data;
                if (os == NULL) {
                        os = ASN1_OCTET_STRING_new();
                        p7->d.enveloped->enc_data->enc_data = os;
                }
                break;

        case NID_pkcs7_signed:
                os = p7->d.sign->contents->d.data;
                break;

        default:
                os = NULL;
                break;
        }

        if (os == NULL)
                return 0;

        os->flags |= ASN1_STRING_FLAG_NDEF;
        *boundary = &os->data;

        return 1;
}
LCRYPTO_ALIAS(PKCS7_stream);