[thirdparty/openssl.git] / crypto / pkcs7 / pk7_smime.c

/*
 * Copyright 1999-2021 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (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
 */

/* Simple PKCS#7 processing functions */

#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include "pk7_local.h"

#define BUFFERSIZE 4096


static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si);

PKCS7 *PKCS7_sign_ex(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
                     BIO *data, int flags, OSSL_LIB_CTX *libctx,
                     const char *propq)
{
    PKCS7 *p7;
    int i;

    if ((p7 = PKCS7_new_ex(libctx, propq)) == NULL) {
        ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
        return NULL;
    }

    if (!PKCS7_set_type(p7, NID_pkcs7_signed))
        goto err;

    if (!PKCS7_content_new(p7, NID_pkcs7_data))
        goto err;

    if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags)) {
        ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
        goto err;
    }

    if (!(flags & PKCS7_NOCERTS)) {
        for (i = 0; i < sk_X509_num(certs); i++) {
            if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
                goto err;
        }
    }

    if (flags & PKCS7_DETACHED)
        PKCS7_set_detached(p7, 1);

    if (flags & (PKCS7_STREAM | PKCS7_PARTIAL))
        return p7;

    if (PKCS7_final(p7, data, flags))
        return p7;

 err:
    PKCS7_free(p7);
    return NULL;
}

PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
                  BIO *data, int flags)
{
    return PKCS7_sign_ex(signcert, pkey, certs, data, flags, NULL, NULL);
}


int PKCS7_final(PKCS7 *p7, BIO *data, int flags)
{
    BIO *p7bio;
    int ret = 0;

    if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
        ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
        return 0;
    }

    if (!SMIME_crlf_copy(data, p7bio, flags))
        goto err;

    (void)BIO_flush(p7bio);

    if (!PKCS7_dataFinal(p7, p7bio)) {
        ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_DATASIGN);
        goto err;
    }
    ret = 1;
err:
    BIO_free_all(p7bio);

    return ret;

}

/* Check to see if a cipher exists and if so add S/MIME capabilities */

static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
{
    if (EVP_get_cipherbynid(nid))
        return PKCS7_simple_smimecap(sk, nid, arg);
    return 1;
}

static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
{
    if (EVP_get_digestbynid(nid))
        return PKCS7_simple_smimecap(sk, nid, arg);
    return 1;
}

PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert,
                                         EVP_PKEY *pkey, const EVP_MD *md,
                                         int flags)
{
    PKCS7_SIGNER_INFO *si = NULL;
    STACK_OF(X509_ALGOR) *smcap = NULL;

    if (!X509_check_private_key(signcert, pkey)) {
        ERR_raise(ERR_LIB_PKCS7,
                  PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
        return NULL;
    }

    if ((si = PKCS7_add_signature(p7, signcert, pkey, md)) == NULL) {
        ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
        return NULL;
    }

    si->ctx = ossl_pkcs7_get0_ctx(p7);
    if (!(flags & PKCS7_NOCERTS)) {
        if (!PKCS7_add_certificate(p7, signcert))
            goto err;
    }

    if (!(flags & PKCS7_NOATTR)) {
        if (!PKCS7_add_attrib_content_type(si, NULL))
            goto err;
        /* Add SMIMECapabilities */
        if (!(flags & PKCS7_NOSMIMECAP)) {
            if ((smcap = sk_X509_ALGOR_new_null()) == NULL) {
                ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
                goto err;
            }
            if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
                || !add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
                || !add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
                || !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
                || !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
                || !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
                || !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
                || !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
                || !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
                || !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
                || !add_cipher_smcap(smcap, NID_des_cbc, -1)
                || !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
                || !PKCS7_add_attrib_smimecap(si, smcap))
                goto err;
            sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
            smcap = NULL;
        }
        if (flags & PKCS7_REUSE_DIGEST) {
            if (!pkcs7_copy_existing_digest(p7, si))
                goto err;
            if (!(flags & PKCS7_PARTIAL)
                && !PKCS7_SIGNER_INFO_sign(si))
                goto err;
        }
    }
    return si;
 err:
    sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
    return NULL;
}

/*
 * Search for a digest matching SignerInfo digest type and if found copy
 * across.
 */

static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
{
    int i;
    STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
    PKCS7_SIGNER_INFO *sitmp;
    ASN1_OCTET_STRING *osdig = NULL;
    sinfos = PKCS7_get_signer_info(p7);
    for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
        sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
        if (si == sitmp)
            break;
        if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
            continue;
        if (!OBJ_cmp(si->digest_alg->algorithm, sitmp->digest_alg->algorithm)) {
            osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
            break;
        }

    }

    if (osdig != NULL)
        return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);

    ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
    return 0;
}

/* This strongly overlaps with CMS_verify(), partly with PKCS7_dataVerify() */
int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
                 BIO *indata, BIO *out, int flags)
{
    STACK_OF(X509) *signers;
    X509 *signer;
    STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
    PKCS7_SIGNER_INFO *si;
    X509_STORE_CTX *cert_ctx = NULL;
    char *buf = NULL;
    int i, j = 0, k, ret = 0;
    BIO *p7bio = NULL;
    BIO *tmpout = NULL;
    const PKCS7_CTX *p7_ctx;

    if (p7 == NULL) {
        ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
        return 0;
    }

    if (!PKCS7_type_is_signed(p7)) {
        ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE);
        return 0;
    }

    /* Check for no data and no content: no data to verify signature */
    if (PKCS7_get_detached(p7) && indata == NULL) {
        ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
        return 0;
    }

    if (flags & PKCS7_NO_DUAL_CONTENT) {
        /*
         * This was originally "#if 0" because we thought that only old broken
         * Netscape did this.  It turns out that Authenticode uses this kind
         * of "extended" PKCS7 format, and things like UEFI secure boot and
         * tools like osslsigncode need it.  In Authenticode the verification
         * process is different, but the existing PKCs7 verification works.
         */
        if (!PKCS7_get_detached(p7) && indata != NULL) {
            ERR_raise(ERR_LIB_PKCS7, PKCS7_R_CONTENT_AND_DATA_PRESENT);
            return 0;
        }
    }

    sinfos = PKCS7_get_signer_info(p7);

    if (!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
        ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_SIGNATURES_ON_DATA);
        return 0;
    }

    signers = PKCS7_get0_signers(p7, certs, flags);
    if (signers == NULL)
        return 0;

    /* Now verify the certificates */
    p7_ctx = ossl_pkcs7_get0_ctx(p7);
    cert_ctx = X509_STORE_CTX_new_ex(ossl_pkcs7_ctx_get0_libctx(p7_ctx),
                                     ossl_pkcs7_ctx_get0_propq(p7_ctx));
    if (cert_ctx == NULL)
        goto err;
    if (!(flags & PKCS7_NOVERIFY))
        for (k = 0; k < sk_X509_num(signers); k++) {
            signer = sk_X509_value(signers, k);
            if (!(flags & PKCS7_NOCHAIN)) {
                if (!X509_STORE_CTX_init(cert_ctx, store, signer,
                                         p7->d.sign->cert)) {
                    ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
                    goto err;
                }
                X509_STORE_CTX_set_default(cert_ctx, "smime_sign");
            } else if (!X509_STORE_CTX_init(cert_ctx, store, signer, NULL)) {
                ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
                goto err;
            }
            if (!(flags & PKCS7_NOCRL))
                X509_STORE_CTX_set0_crls(cert_ctx, p7->d.sign->crl);
            i = X509_verify_cert(cert_ctx);
            if (i <= 0)
                j = X509_STORE_CTX_get_error(cert_ctx);
            if (i <= 0) {
                ERR_raise_data(ERR_LIB_PKCS7, PKCS7_R_CERTIFICATE_VERIFY_ERROR,
                               "Verify error: %s",
                               X509_verify_cert_error_string(j));
                goto err;
            }
            /* Check for revocation status here */
        }

    if ((p7bio = PKCS7_dataInit(p7, indata)) == NULL)
        goto err;

    if (flags & PKCS7_TEXT) {
        if ((tmpout = BIO_new(BIO_s_mem())) == NULL) {
            ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
            goto err;
        }
        BIO_set_mem_eof_return(tmpout, 0);
    } else
        tmpout = out;

    /* We now have to 'read' from p7bio to calculate digests etc. */
    if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
        ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
        goto err;
    }
    for (;;) {
        i = BIO_read(p7bio, buf, BUFFERSIZE);
        if (i <= 0)
            break;
        if (tmpout)
            BIO_write(tmpout, buf, i);
    }

    if (flags & PKCS7_TEXT) {
        if (!SMIME_text(tmpout, out)) {
            ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SMIME_TEXT_ERROR);
            BIO_free(tmpout);
            goto err;
        }
        BIO_free(tmpout);
    }

    /* Now Verify All Signatures */
    if (!(flags & PKCS7_NOSIGS))
        for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
            si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
            signer = sk_X509_value(signers, i);
            j = PKCS7_signatureVerify(p7bio, p7, si, signer);
            if (j <= 0) {
                ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNATURE_FAILURE);
                goto err;
            }
        }

    ret = 1;

 err:
    X509_STORE_CTX_free(cert_ctx);
    OPENSSL_free(buf);
    if (indata != NULL)
        BIO_pop(p7bio);
    BIO_free_all(p7bio);
    sk_X509_free(signers);
    return ret;
}

STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs,
                                   int flags)
{
    STACK_OF(X509) *signers;
    STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
    PKCS7_SIGNER_INFO *si;
    PKCS7_ISSUER_AND_SERIAL *ias;
    X509 *signer;
    int i;

    if (p7 == NULL) {
        ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
        return NULL;
    }

    if (!PKCS7_type_is_signed(p7)) {
        ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE);
        return NULL;
    }

    /* Collect all the signers together */

    sinfos = PKCS7_get_signer_info(p7);

    if (sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
        ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_SIGNERS);
        return 0;
    }

    if ((signers = sk_X509_new_null()) == NULL) {
        ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
        return NULL;
    }

    for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
        si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
        ias = si->issuer_and_serial;
        signer = NULL;
        /* If any certificates passed they take priority */
        if (certs != NULL)
            signer = X509_find_by_issuer_and_serial(certs,
                                                    ias->issuer, ias->serial);
        if (signer == NULL && !(flags & PKCS7_NOINTERN)
            && p7->d.sign->cert)
            signer =
                X509_find_by_issuer_and_serial(p7->d.sign->cert,
                                               ias->issuer, ias->serial);
        if (signer == NULL) {
            ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
            sk_X509_free(signers);
            return 0;
        }

        if (!sk_X509_push(signers, signer)) {
            sk_X509_free(signers);
            return NULL;
        }
    }
    return signers;
}

/* Build a complete PKCS#7 enveloped data */

PKCS7 *PKCS7_encrypt_ex(STACK_OF(X509) *certs, BIO *in,
                        const EVP_CIPHER *cipher, int flags,
                        OSSL_LIB_CTX *libctx, const char *propq)
{
    PKCS7 *p7;
    BIO *p7bio = NULL;
    int i;
    X509 *x509;

    if ((p7 = PKCS7_new_ex(libctx, propq)) == NULL) {
        ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
        return NULL;
    }

    if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
        goto err;
    if (!PKCS7_set_cipher(p7, cipher)) {
        ERR_raise(ERR_LIB_PKCS7, PKCS7_R_ERROR_SETTING_CIPHER);
        goto err;
    }

    for (i = 0; i < sk_X509_num(certs); i++) {
        x509 = sk_X509_value(certs, i);
        if (!PKCS7_add_recipient(p7, x509)) {
            ERR_raise(ERR_LIB_PKCS7, PKCS7_R_ERROR_ADDING_RECIPIENT);
            goto err;
        }
    }

    if (flags & PKCS7_STREAM)
        return p7;

    if (PKCS7_final(p7, in, flags))
        return p7;

 err:

    BIO_free_all(p7bio);
    PKCS7_free(p7);
    return NULL;

}

PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
                     int flags)
{
    return PKCS7_encrypt_ex(certs, in, cipher, flags, NULL, NULL);
}


int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
{
    BIO *tmpmem;
    int ret = 0, i;
    char *buf = NULL;

    if (p7 == NULL) {
        ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
        return 0;
    }

    if (!PKCS7_type_is_enveloped(p7)) {
        ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE);
        return 0;
    }

    if (cert && !X509_check_private_key(cert, pkey)) {
        ERR_raise(ERR_LIB_PKCS7,
                  PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
        return 0;
    }

    if ((tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert)) == NULL) {
        ERR_raise(ERR_LIB_PKCS7, PKCS7_R_DECRYPT_ERROR);
        return 0;
    }

    if (flags & PKCS7_TEXT) {
        BIO *tmpbuf, *bread;
        /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
        if ((tmpbuf = BIO_new(BIO_f_buffer())) == NULL) {
            ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
            BIO_free_all(tmpmem);
            return 0;
        }
        if ((bread = BIO_push(tmpbuf, tmpmem)) == NULL) {
            ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
            BIO_free_all(tmpbuf);
            BIO_free_all(tmpmem);
            return 0;
        }
        ret = SMIME_text(bread, data);
        if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
            if (BIO_get_cipher_status(tmpmem) <= 0)
                ret = 0;
        }
        BIO_free_all(bread);
        return ret;
    }
    if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
        ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
        goto err;
    }
    for (;;) {
        i = BIO_read(tmpmem, buf, BUFFERSIZE);
        if (i <= 0) {
            ret = 1;
            if (BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
                if (BIO_get_cipher_status(tmpmem) <= 0)
                    ret = 0;
            }

            break;
        }
        if (BIO_write(data, buf, i) != i) {
            break;
        }
    }
err:
    OPENSSL_free(buf);
    BIO_free_all(tmpmem);
    return ret;
}
Commit	Line	Data
0f113f3e	1	/*
4333b89f	2	* Copyright 1999-2021 The OpenSSL Project Authors. All Rights Reserved.
5a9a4b29	3	*
b7617a3a	4	* Licensed under the Apache License 2.0 (the "License"). You may not use
62867571 RS	5	* this file except in compliance with the License. You can obtain a copy
	6	* in the file LICENSE in the source distribution or at
	7	* https://www.openssl.org/source/license.html
5a9a4b29 DSH	8	*/
	9
	10	/* Simple PKCS#7 processing functions */
	11
	12	#include <stdio.h>
b39fc560	13	#include "internal/cryptlib.h"
5a9a4b29 DSH	14	#include <openssl/x509.h>
5a9a4b29 DSH	15	#include <openssl/x509v3.h>
90a1f2d7	16	#include "pk7_local.h"
5a9a4b29	17
8e704858 RS	18	#define BUFFERSIZE 4096
8e704858 RS	19
852c2ed2	20
55311921 DSH	21	static int pkcs7_copy_existing_digest(PKCS7 p7, PKCS7_SIGNER_INFO si);
55311921 DSH	22
d8652be0	23	PKCS7 PKCS7_sign_ex(X509 signcert, EVP_PKEY pkey, STACK_OF(X509) certs,
b4250010	24	BIO data, int flags, OSSL_LIB_CTX libctx,
d8652be0	25	const char *propq)
5a9a4b29	26	{
0f113f3e MC	27	PKCS7 *p7;
	28	int i;
	29
d8652be0	30	if ((p7 = PKCS7_new_ex(libctx, propq)) == NULL) {
9311d0c4	31	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
0f113f3e MC	32	return NULL;
	33	}
	34
	35	if (!PKCS7_set_type(p7, NID_pkcs7_signed))
	36	goto err;
	37
	38	if (!PKCS7_content_new(p7, NID_pkcs7_data))
	39	goto err;
	40
	41	if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags)) {
9311d0c4	42	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
0f113f3e MC	43	goto err;
	44	}
	45
	46	if (!(flags & PKCS7_NOCERTS)) {
	47	for (i = 0; i < sk_X509_num(certs); i++) {
	48	if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
	49	goto err;
	50	}
	51	}
	52
	53	if (flags & PKCS7_DETACHED)
	54	PKCS7_set_detached(p7, 1);
	55
	56	if (flags & (PKCS7_STREAM \| PKCS7_PARTIAL))
	57	return p7;
	58
	59	if (PKCS7_final(p7, data, flags))
	60	return p7;
	61
	62	err:
	63	PKCS7_free(p7);
	64	return NULL;
60f20632 DSH	65	}
60f20632 DSH	66
90a1f2d7 SL	67	PKCS7 PKCS7_sign(X509 signcert, EVP_PKEY pkey, STACK_OF(X509) certs,
	68	BIO *data, int flags)
	69	{
d8652be0	70	return PKCS7_sign_ex(signcert, pkey, certs, data, flags, NULL, NULL);
90a1f2d7 SL	71	}
	72
	73
60f20632	74	int PKCS7_final(PKCS7 p7, BIO data, int flags)
0f113f3e MC	75	{
	76	BIO *p7bio;
	77	int ret = 0;
8e704858	78
75ebbd9a	79	if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
9311d0c4	80	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
0f113f3e MC	81	return 0;
0f113f3e MC	82	}
60f20632	83
67c0460b ABL	84	if (!SMIME_crlf_copy(data, p7bio, flags))
67c0460b ABL	85	goto err;
994df5a2	86
0f113f3e	87	(void)BIO_flush(p7bio);
60f20632	88
0f113f3e	89	if (!PKCS7_dataFinal(p7, p7bio)) {
9311d0c4	90	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_DATASIGN);
0f113f3e MC	91	goto err;
0f113f3e MC	92	}
0f113f3e	93	ret = 1;
90a1f2d7	94	err:
0f113f3e	95	BIO_free_all(p7bio);
60f20632	96
0f113f3e	97	return ret;
27068df7	98
0f113f3e	99	}
27068df7	100
60f20632	101	/* Check to see if a cipher exists and if so add S/MIME capabilities */
27068df7	102
60f20632	103	static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
0f113f3e MC	104	{
	105	if (EVP_get_cipherbynid(nid))
	106	return PKCS7_simple_smimecap(sk, nid, arg);
	107	return 1;
	108	}
5a9a4b29	109
61e5ec4b	110	static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
0f113f3e MC	111	{
	112	if (EVP_get_digestbynid(nid))
	113	return PKCS7_simple_smimecap(sk, nid, arg);
	114	return 1;
	115	}
61e5ec4b	116
60f20632	117	PKCS7_SIGNER_INFO PKCS7_sign_add_signer(PKCS7 p7, X509 *signcert,
0f113f3e MC	118	EVP_PKEY pkey, const EVP_MD md,
	119	int flags)
	120	{
	121	PKCS7_SIGNER_INFO *si = NULL;
	122	STACK_OF(X509_ALGOR) *smcap = NULL;
90a1f2d7	123
0f113f3e	124	if (!X509_check_private_key(signcert, pkey)) {
9311d0c4 RL	125	ERR_raise(ERR_LIB_PKCS7,
9311d0c4 RL	126	PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
0f113f3e MC	127	return NULL;
	128	}
	129
75ebbd9a	130	if ((si = PKCS7_add_signature(p7, signcert, pkey, md)) == NULL) {
9311d0c4	131	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
0f113f3e MC	132	return NULL;
	133	}
	134
681618cf	135	si->ctx = ossl_pkcs7_get0_ctx(p7);
0f113f3e MC	136	if (!(flags & PKCS7_NOCERTS)) {
	137	if (!PKCS7_add_certificate(p7, signcert))
	138	goto err;
	139	}
	140
	141	if (!(flags & PKCS7_NOATTR)) {
	142	if (!PKCS7_add_attrib_content_type(si, NULL))
	143	goto err;
	144	/* Add SMIMECapabilities */
	145	if (!(flags & PKCS7_NOSMIMECAP)) {
75ebbd9a	146	if ((smcap = sk_X509_ALGOR_new_null()) == NULL) {
9311d0c4	147	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
0f113f3e MC	148	goto err;
	149	}
	150	if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
c58f3e42 MC	151	\|\| !add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
c58f3e42 MC	152	\|\| !add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
0f113f3e MC	153	\|\| !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
	154	\|\| !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
	155	\|\| !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
	156	\|\| !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
	157	\|\| !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
	158	\|\| !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
	159	\|\| !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
	160	\|\| !add_cipher_smcap(smcap, NID_des_cbc, -1)
	161	\|\| !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
	162	\|\| !PKCS7_add_attrib_smimecap(si, smcap))
	163	goto err;
	164	sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
	165	smcap = NULL;
	166	}
	167	if (flags & PKCS7_REUSE_DIGEST) {
	168	if (!pkcs7_copy_existing_digest(p7, si))
	169	goto err;
90a1f2d7 SL	170	if (!(flags & PKCS7_PARTIAL)
90a1f2d7 SL	171	&& !PKCS7_SIGNER_INFO_sign(si))
0f113f3e MC	172	goto err;
	173	}
	174	}
	175	return si;
	176	err:
222561fe	177	sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
0f113f3e MC	178	return NULL;
	179	}
	180
	181	/*
	182	* Search for a digest matching SignerInfo digest type and if found copy
	183	* across.
55311921 DSH	184	*/
	185
	186	static int pkcs7_copy_existing_digest(PKCS7 p7, PKCS7_SIGNER_INFO si)
0f113f3e MC	187	{
	188	int i;
	189	STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
	190	PKCS7_SIGNER_INFO *sitmp;
	191	ASN1_OCTET_STRING *osdig = NULL;
	192	sinfos = PKCS7_get_signer_info(p7);
	193	for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
	194	sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
	195	if (si == sitmp)
	196	break;
	197	if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
	198	continue;
	199	if (!OBJ_cmp(si->digest_alg->algorithm, sitmp->digest_alg->algorithm)) {
	200	osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
	201	break;
	202	}
	203
	204	}
	205
90a1f2d7	206	if (osdig != NULL)
0f113f3e MC	207	return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
0f113f3e MC	208
9311d0c4	209	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
0f113f3e MC	210	return 0;
0f113f3e MC	211	}
55311921	212
f69ec4b4	213	/* This strongly overlaps with CMS_verify(), partly with PKCS7_dataVerify() */
5a9a4b29	214	int PKCS7_verify(PKCS7 p7, STACK_OF(X509) certs, X509_STORE *store,
0f113f3e	215	BIO indata, BIO out, int flags)
5a9a4b29	216	{
0f113f3e MC	217	STACK_OF(X509) *signers;
	218	X509 *signer;
	219	STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
	220	PKCS7_SIGNER_INFO *si;
f0e0fd51	221	X509_STORE_CTX *cert_ctx = NULL;
8e704858	222	char *buf = NULL;
0f113f3e	223	int i, j = 0, k, ret = 0;
55500ea7	224	BIO *p7bio = NULL;
30adf6d2	225	BIO *tmpout = NULL;
90a1f2d7	226	const PKCS7_CTX *p7_ctx;
0f113f3e	227
12a765a5	228	if (p7 == NULL) {
9311d0c4	229	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
0f113f3e MC	230	return 0;
	231	}
	232
	233	if (!PKCS7_type_is_signed(p7)) {
9311d0c4	234	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE);
0f113f3e MC	235	return 0;
	236	}
	237
	238	/* Check for no data and no content: no data to verify signature */
f69ec4b4	239	if (PKCS7_get_detached(p7) && indata == NULL) {
9311d0c4	240	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
0f113f3e MC	241	return 0;
0f113f3e MC	242	}
02a938c9	243
6b2ebe43 RS	244	if (flags & PKCS7_NO_DUAL_CONTENT) {
	245	/*
	246	* This was originally "#if 0" because we thought that only old broken
	247	* Netscape did this. It turns out that Authenticode uses this kind
	248	* of "extended" PKCS7 format, and things like UEFI secure boot and
	249	* tools like osslsigncode need it. In Authenticode the verification
	250	* process is different, but the existing PKCs7 verification works.
	251	*/
f69ec4b4	252	if (!PKCS7_get_detached(p7) && indata != NULL) {
9311d0c4	253	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_CONTENT_AND_DATA_PRESENT);
6b2ebe43 RS	254	return 0;
6b2ebe43 RS	255	}
0f113f3e	256	}
5a9a4b29	257
0f113f3e MC	258	sinfos = PKCS7_get_signer_info(p7);
	259
	260	if (!sinfos \|\| !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
9311d0c4	261	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_SIGNATURES_ON_DATA);
0f113f3e MC	262	return 0;
	263	}
	264
	265	signers = PKCS7_get0_signers(p7, certs, flags);
90a1f2d7	266	if (signers == NULL)
0f113f3e MC	267	return 0;
	268
	269	/* Now verify the certificates */
681618cf SL	270	p7_ctx = ossl_pkcs7_get0_ctx(p7);
	271	cert_ctx = X509_STORE_CTX_new_ex(ossl_pkcs7_ctx_get0_libctx(p7_ctx),
	272	ossl_pkcs7_ctx_get0_propq(p7_ctx));
f0e0fd51 RS	273	if (cert_ctx == NULL)
f0e0fd51 RS	274	goto err;
0f113f3e MC	275	if (!(flags & PKCS7_NOVERIFY))
	276	for (k = 0; k < sk_X509_num(signers); k++) {
	277	signer = sk_X509_value(signers, k);
	278	if (!(flags & PKCS7_NOCHAIN)) {
f0e0fd51	279	if (!X509_STORE_CTX_init(cert_ctx, store, signer,
0f113f3e	280	p7->d.sign->cert)) {
9311d0c4	281	ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
55500ea7	282	goto err;
0f113f3e	283	}
f0e0fd51 RS	284	X509_STORE_CTX_set_default(cert_ctx, "smime_sign");
f0e0fd51 RS	285	} else if (!X509_STORE_CTX_init(cert_ctx, store, signer, NULL)) {
9311d0c4	286	ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
55500ea7	287	goto err;
0f113f3e MC	288	}
0f113f3e MC	289	if (!(flags & PKCS7_NOCRL))
f0e0fd51 RS	290	X509_STORE_CTX_set0_crls(cert_ctx, p7->d.sign->crl);
f0e0fd51 RS	291	i = X509_verify_cert(cert_ctx);
0f113f3e	292	if (i <= 0)
f0e0fd51	293	j = X509_STORE_CTX_get_error(cert_ctx);
0f113f3e	294	if (i <= 0) {
a150f8e1 RL	295	ERR_raise_data(ERR_LIB_PKCS7, PKCS7_R_CERTIFICATE_VERIFY_ERROR,
	296	"Verify error: %s",
	297	X509_verify_cert_error_string(j));
55500ea7	298	goto err;
0f113f3e MC	299	}
	300	/* Check for revocation status here */
	301	}
	302
30adf6d2	303	if ((p7bio = PKCS7_dataInit(p7, indata)) == NULL)
0f113f3e MC	304	goto err;
	305
	306	if (flags & PKCS7_TEXT) {
75ebbd9a	307	if ((tmpout = BIO_new(BIO_s_mem())) == NULL) {
9311d0c4	308	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
0f113f3e MC	309	goto err;
	310	}
	311	BIO_set_mem_eof_return(tmpout, 0);
	312	} else
	313	tmpout = out;
	314
	315	/* We now have to 'read' from p7bio to calculate digests etc. */
8e704858	316	if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
9311d0c4	317	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
8e704858 RS	318	goto err;
8e704858 RS	319	}
0f113f3e	320	for (;;) {
8e704858	321	i = BIO_read(p7bio, buf, BUFFERSIZE);
0f113f3e MC	322	if (i <= 0)
	323	break;
	324	if (tmpout)
	325	BIO_write(tmpout, buf, i);
	326	}
	327
	328	if (flags & PKCS7_TEXT) {
	329	if (!SMIME_text(tmpout, out)) {
9311d0c4	330	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SMIME_TEXT_ERROR);
0f113f3e MC	331	BIO_free(tmpout);
	332	goto err;
	333	}
	334	BIO_free(tmpout);
	335	}
	336
	337	/* Now Verify All Signatures */
	338	if (!(flags & PKCS7_NOSIGS))
	339	for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
	340	si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
	341	signer = sk_X509_value(signers, i);
	342	j = PKCS7_signatureVerify(p7bio, p7, si, signer);
	343	if (j <= 0) {
9311d0c4	344	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNATURE_FAILURE);
0f113f3e MC	345	goto err;
	346	}
	347	}
	348
	349	ret = 1;
	350
	351	err:
f0e0fd51	352	X509_STORE_CTX_free(cert_ctx);
8e704858	353	OPENSSL_free(buf);
f69ec4b4	354	if (indata != NULL)
30adf6d2	355	BIO_pop(p7bio);
0f113f3e	356	BIO_free_all(p7bio);
0f113f3e	357	sk_X509_free(signers);
0f113f3e	358	return ret;
5a9a4b29 DSH	359	}
5a9a4b29 DSH	360
0f113f3e MC	361	STACK_OF(X509) PKCS7_get0_signers(PKCS7 p7, STACK_OF(X509) *certs,
0f113f3e MC	362	int flags)
55ec5861	363	{
0f113f3e MC	364	STACK_OF(X509) *signers;
	365	STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
	366	PKCS7_SIGNER_INFO *si;
	367	PKCS7_ISSUER_AND_SERIAL *ias;
	368	X509 *signer;
	369	int i;
	370
12a765a5	371	if (p7 == NULL) {
9311d0c4	372	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
0f113f3e MC	373	return NULL;
	374	}
	375
	376	if (!PKCS7_type_is_signed(p7)) {
9311d0c4	377	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE);
0f113f3e MC	378	return NULL;
	379	}
	380
	381	/* Collect all the signers together */
	382
	383	sinfos = PKCS7_get_signer_info(p7);
	384
	385	if (sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
9311d0c4	386	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_SIGNERS);
0f113f3e MC	387	return 0;
	388	}
	389
75ebbd9a	390	if ((signers = sk_X509_new_null()) == NULL) {
9311d0c4	391	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
0f113f3e MC	392	return NULL;
	393	}
	394
	395	for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
	396	si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
	397	ias = si->issuer_and_serial;
	398	signer = NULL;
	399	/* If any certificates passed they take priority */
f69ec4b4	400	if (certs != NULL)
0f113f3e MC	401	signer = X509_find_by_issuer_and_serial(certs,
0f113f3e MC	402	ias->issuer, ias->serial);
f69ec4b4	403	if (signer == NULL && !(flags & PKCS7_NOINTERN)
0f113f3e MC	404	&& p7->d.sign->cert)
	405	signer =
	406	X509_find_by_issuer_and_serial(p7->d.sign->cert,
	407	ias->issuer, ias->serial);
f69ec4b4	408	if (signer == NULL) {
9311d0c4	409	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
0f113f3e MC	410	sk_X509_free(signers);
	411	return 0;
	412	}
	413
	414	if (!sk_X509_push(signers, signer)) {
	415	sk_X509_free(signers);
	416	return NULL;
	417	}
	418	}
	419	return signers;
55ec5861 DSH	420	}
55ec5861 DSH	421
5a9a4b29 DSH	422	/* Build a complete PKCS#7 enveloped data */
5a9a4b29 DSH	423
d8652be0 MC	424	PKCS7 PKCS7_encrypt_ex(STACK_OF(X509) certs, BIO *in,
d8652be0 MC	425	const EVP_CIPHER *cipher, int flags,
b4250010	426	OSSL_LIB_CTX libctx, const char propq)
5a9a4b29	427	{
0f113f3e MC	428	PKCS7 *p7;
	429	BIO *p7bio = NULL;
	430	int i;
	431	X509 *x509;
90a1f2d7	432
d8652be0	433	if ((p7 = PKCS7_new_ex(libctx, propq)) == NULL) {
9311d0c4	434	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
0f113f3e MC	435	return NULL;
	436	}
	437
	438	if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
	439	goto err;
	440	if (!PKCS7_set_cipher(p7, cipher)) {
9311d0c4	441	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_ERROR_SETTING_CIPHER);
0f113f3e MC	442	goto err;
	443	}
	444
	445	for (i = 0; i < sk_X509_num(certs); i++) {
	446	x509 = sk_X509_value(certs, i);
	447	if (!PKCS7_add_recipient(p7, x509)) {
9311d0c4	448	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_ERROR_ADDING_RECIPIENT);
0f113f3e MC	449	goto err;
	450	}
	451	}
	452
	453	if (flags & PKCS7_STREAM)
	454	return p7;
	455
	456	if (PKCS7_final(p7, in, flags))
	457	return p7;
	458
	459	err:
	460
	461	BIO_free_all(p7bio);
	462	PKCS7_free(p7);
	463	return NULL;
5a9a4b29 DSH	464
	465	}
	466
90a1f2d7 SL	467	PKCS7 PKCS7_encrypt(STACK_OF(X509) certs, BIO in, const EVP_CIPHER cipher,
	468	int flags)
	469	{
d8652be0	470	return PKCS7_encrypt_ex(certs, in, cipher, flags, NULL, NULL);
90a1f2d7 SL	471	}
	472
	473
5a9a4b29 DSH	474	int PKCS7_decrypt(PKCS7 p7, EVP_PKEY pkey, X509 cert, BIO data, int flags)
5a9a4b29 DSH	475	{
0f113f3e	476	BIO *tmpmem;
29717229	477	int ret = 0, i;
8e704858	478	char *buf = NULL;
0f113f3e	479
12a765a5	480	if (p7 == NULL) {
9311d0c4	481	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
0f113f3e MC	482	return 0;
	483	}
	484
	485	if (!PKCS7_type_is_enveloped(p7)) {
9311d0c4	486	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE);
0f113f3e MC	487	return 0;
	488	}
	489
	490	if (cert && !X509_check_private_key(cert, pkey)) {
9311d0c4 RL	491	ERR_raise(ERR_LIB_PKCS7,
9311d0c4 RL	492	PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
0f113f3e MC	493	return 0;
	494	}
	495
75ebbd9a	496	if ((tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert)) == NULL) {
9311d0c4	497	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_DECRYPT_ERROR);
0f113f3e MC	498	return 0;
	499	}
	500
	501	if (flags & PKCS7_TEXT) {
	502	BIO tmpbuf, bread;
	503	/* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
75ebbd9a	504	if ((tmpbuf = BIO_new(BIO_f_buffer())) == NULL) {
9311d0c4	505	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
0f113f3e MC	506	BIO_free_all(tmpmem);
	507	return 0;
	508	}
75ebbd9a	509	if ((bread = BIO_push(tmpbuf, tmpmem)) == NULL) {
9311d0c4	510	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
0f113f3e MC	511	BIO_free_all(tmpbuf);
	512	BIO_free_all(tmpmem);
	513	return 0;
	514	}
	515	ret = SMIME_text(bread, data);
	516	if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
48b571fe	517	if (BIO_get_cipher_status(tmpmem) <= 0)
0f113f3e MC	518	ret = 0;
	519	}
	520	BIO_free_all(bread);
	521	return ret;
8e704858 RS	522	}
8e704858 RS	523	if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
9311d0c4	524	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
8e704858 RS	525	goto err;
	526	}
	527	for (;;) {
	528	i = BIO_read(tmpmem, buf, BUFFERSIZE);
	529	if (i <= 0) {
	530	ret = 1;
	531	if (BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
48b571fe	532	if (BIO_get_cipher_status(tmpmem) <= 0)
8e704858	533	ret = 0;
0f113f3e	534	}
8e704858 RS	535
	536	break;
	537	}
	538	if (BIO_write(data, buf, i) != i) {
8e704858	539	break;
0f113f3e	540	}
0f113f3e	541	}
8e704858 RS	542	err:
	543	OPENSSL_free(buf);
	544	BIO_free_all(tmpmem);
	545	return ret;
5a9a4b29	546	}