/*

 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/objects.h>

#include <openssl/x509.h>

#include "crypto/asn1.h"

#include "crypto/evp.h"

long PKCS7_ctrl(PKCS7 *p7, int cmd, long larg, char *parg)

{

    int nid;

    long ret;

    nid = OBJ_obj2nid(p7->type);

    switch (cmd) {

    /* NOTE(emilia): does not support detached digested data. */

    case PKCS7_OP_SET_DETACHED_SIGNATURE:

        if (nid == NID_pkcs7_signed) {

            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 {

            PKCS7err(PKCS7_F_PKCS7_CTRL,

                     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 || !p7->d.sign->contents->d.ptr)

                ret = 1;

            else

                ret = 0;

            p7->detached = ret;

        } else {

            PKCS7err(PKCS7_F_PKCS7_CTRL,

                     PKCS7_R_OPERATION_NOT_SUPPORTED_ON_THIS_TYPE);

            ret = 0;

        }

        break;

    default:

        PKCS7err(PKCS7_F_PKCS7_CTRL, PKCS7_R_UNKNOWN_OPERATION);

        ret = 0;

    }

    return ret;

}

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:

    PKCS7_free(ret);

    return 0;

}

int PKCS7_set_content(PKCS7 *p7, PKCS7 *p7_data)

{

    int i;

    i = OBJ_obj2nid(p7->type);

    switch (i) {

    case NID_pkcs7_signed:

        PKCS7_free(p7->d.sign->contents);

        p7->d.sign->contents = p7_data;

        break;

    case NID_pkcs7_digest:

        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:

        PKCS7err(PKCS7_F_PKCS7_SET_CONTENT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);

        goto err;

    }

    return 1;

 err:

    return 0;

}

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:

        PKCS7err(PKCS7_F_PKCS7_SET_TYPE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);

        goto err;

    }

    return 1;

 err:

    return 0;

}

int PKCS7_set0_type_other(PKCS7 *p7, int type, ASN1_TYPE *other)

{

    p7->type = OBJ_nid2obj(type);

    p7->d.other = other;

    return 1;

}

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:

        PKCS7err(PKCS7_F_PKCS7_ADD_SIGNER, 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()) == NULL

            || (alg->parameter = ASN1_TYPE_new()) == NULL) {

            X509_ALGOR_free(alg);

            PKCS7err(PKCS7_F_PKCS7_ADD_SIGNER, 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;

}

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:

        PKCS7err(PKCS7_F_PKCS7_ADD_CERTIFICATE, PKCS7_R_WRONG_CONTENT_TYPE);

        return 0;

    }

    if (*sk == NULL)

        *sk = sk_X509_new_null();

    if (*sk == NULL) {

        PKCS7err(PKCS7_F_PKCS7_ADD_CERTIFICATE, ERR_R_MALLOC_FAILURE);

        return 0;

    }

    X509_up_ref(x509);

    if (!sk_X509_push(*sk, x509)) {

        X509_free(x509);

        return 0;

    }

    return 1;

}

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:

        PKCS7err(PKCS7_F_PKCS7_ADD_CRL, PKCS7_R_WRONG_CONTENT_TYPE);

        return 0;

    }

    if (*sk == NULL)

        *sk = sk_X509_CRL_new_null();

    if (*sk == NULL) {

        PKCS7err(PKCS7_F_PKCS7_ADD_CRL, ERR_R_MALLOC_FAILURE);

        return 0;

    }

    X509_CRL_up_ref(crl);

    if (!sk_X509_CRL_push(*sk, crl)) {

        X509_CRL_free(crl);

        return 0;

    }

    return 1;

}

int PKCS7_SIGNER_INFO_set(PKCS7_SIGNER_INFO *p7i, X509 *x509, EVP_PKEY *pkey,

                          const EVP_MD *dgst)

{

    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 */

    EVP_PKEY_up_ref(pkey);

    p7i->pkey = pkey;

    /* Set the algorithms */

    X509_ALGOR_set0(p7i->digest_alg, OBJ_nid2obj(EVP_MD_type(dgst)),

                    V_ASN1_NULL, NULL);

    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) {

            PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SET,

                     PKCS7_R_SIGNING_CTRL_FAILURE);

            return 0;

        }

    }

    PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SET,

             PKCS7_R_SIGNING_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);

 err:

    return 0;

}

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) {

            PKCS7err(PKCS7_F_PKCS7_ADD_SIGNATURE, 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:

    PKCS7_SIGNER_INFO_free(si);

    return NULL;

}

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()) == NULL) {

            PKCS7err(PKCS7_F_PKCS7_SET_DIGEST, 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;

    }

    PKCS7err(PKCS7_F_PKCS7_SET_DIGEST, PKCS7_R_WRONG_CONTENT_TYPE);

    return 1;

}

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;

}

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;

}

void PKCS7_RECIP_INFO_get0_alg(PKCS7_RECIP_INFO *ri, X509_ALGOR **penc)

{

    if (penc)

        *penc = ri->key_enc_algor;

}

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:

    PKCS7_RECIP_INFO_free(ri);

    return NULL;

}

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:

        PKCS7err(PKCS7_F_PKCS7_ADD_RECIPIENT_INFO,

                 PKCS7_R_WRONG_CONTENT_TYPE);

        return 0;

    }

    if (!sk_PKCS7_RECIP_INFO_push(sk, ri))

        return 0;

    return 1;

}

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_get0_pubkey(x509);

    if (!pkey || !pkey->ameth || !pkey->ameth->pkey_ctrl) {

        PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,

                 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) {

        PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,

                 PKCS7_R_ENCRYPTION_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);

        goto err;

    }

    if (ret <= 0) {

        PKCS7err(PKCS7_F_PKCS7_RECIP_INFO_SET,

                 PKCS7_R_ENCRYPTION_CTRL_FAILURE);

        goto err;

    }

    X509_up_ref(x509);

    p7i->cert = x509;

    return 1;

 err:

    return 0;

}

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;

}

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:

        PKCS7err(PKCS7_F_PKCS7_SET_CIPHER, 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) {

        PKCS7err(PKCS7_F_PKCS7_SET_CIPHER,

                 PKCS7_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);

        return 0;

    }

    ec->cipher = cipher;

    return 1;

}

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;

}