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

/*
 * Copyright 1999-2020 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>

#define BUFFERSIZE 4096

DEFINE_STACK_OF(X509)
DEFINE_STACK_OF(X509_ATTRIBUTE)
DEFINE_STACK_OF(X509_ALGOR)
DEFINE_STACK_OF(PKCS7_SIGNER_INFO)

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

PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
                  BIO *data, int flags)
{
    PKCS7 *p7;
    int i;

    if ((p7 = PKCS7_new()) == NULL) {
        PKCS7err(PKCS7_F_PKCS7_SIGN, 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)) {
        PKCS7err(PKCS7_F_PKCS7_SIGN, 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;
}

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

    if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
        PKCS7err(PKCS7_F_PKCS7_FINAL, ERR_R_MALLOC_FAILURE);
        return 0;
    }

    SMIME_crlf_copy(data, p7bio, flags);

    (void)BIO_flush(p7bio);

    if (!PKCS7_dataFinal(p7, p7bio)) {
        PKCS7err(PKCS7_F_PKCS7_FINAL, 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)) {
        PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
        return NULL;
    }

    if ((si = PKCS7_add_signature(p7, signcert, pkey, md)) == NULL) {
        PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
                 PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
        return NULL;
    }

    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) {
                PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER, 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)
        return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);

    PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST,
             PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
    return 0;
}

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 *tmpin = NULL, *tmpout = NULL;

    if (p7 == NULL) {
        PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_INVALID_NULL_POINTER);
        return 0;
    }

    if (!PKCS7_type_is_signed(p7)) {
        PKCS7err(PKCS7_F_PKCS7_VERIFY, 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) {
        PKCS7err(PKCS7_F_PKCS7_VERIFY, 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) {
            PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_CONTENT_AND_DATA_PRESENT);
            return 0;
        }
    }

    sinfos = PKCS7_get_signer_info(p7);

    if (!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
        PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_NO_SIGNATURES_ON_DATA);
        return 0;
    }

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

    /* Now verify the certificates */

    cert_ctx = X509_STORE_CTX_new();
    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)) {
                    PKCS7err(PKCS7_F_PKCS7_VERIFY, 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)) {
                PKCS7err(PKCS7_F_PKCS7_VERIFY, 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);
            X509_STORE_CTX_cleanup(cert_ctx);
            if (i <= 0) {
                PKCS7err(PKCS7_F_PKCS7_VERIFY,
                         PKCS7_R_CERTIFICATE_VERIFY_ERROR);
                ERR_add_error_data(2, "Verify error:",
                                   X509_verify_cert_error_string(j));
                goto err;
            }
            /* Check for revocation status here */
        }

    /*
     * Performance optimization: if the content is a memory BIO then store
     * its contents in a temporary read only memory BIO. This avoids
     * potentially large numbers of slow copies of data which will occur when
     * reading from a read write memory BIO when signatures are calculated.
     */

    if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) {
        char *ptr;
        long len;
        len = BIO_get_mem_data(indata, &ptr);
        tmpin = BIO_new_mem_buf(ptr, len);
        if (tmpin == NULL) {
            PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_MALLOC_FAILURE);
            goto err;
        }
    } else
        tmpin = indata;

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

    if (flags & PKCS7_TEXT) {
        if ((tmpout = BIO_new(BIO_s_mem())) == NULL) {
            PKCS7err(PKCS7_F_PKCS7_VERIFY, 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) {
        PKCS7err(PKCS7_F_PKCS7_VERIFY, 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)) {
            PKCS7err(PKCS7_F_PKCS7_VERIFY, 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) {
                PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_SIGNATURE_FAILURE);
                goto err;
            }
        }

    ret = 1;

 err:
    X509_STORE_CTX_free(cert_ctx);
    OPENSSL_free(buf);
    if (tmpin == indata) {
        if (indata)
            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) {
        PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_INVALID_NULL_POINTER);
        return NULL;
    }

    if (!PKCS7_type_is_signed(p7)) {
        PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, 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) {
        PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_NO_SIGNERS);
        return 0;
    }

    if ((signers = sk_X509_new_null()) == NULL) {
        PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, 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)
            signer = X509_find_by_issuer_and_serial(certs,
                                                    ias->issuer, ias->serial);
        if (!signer && !(flags & PKCS7_NOINTERN)
            && p7->d.sign->cert)
            signer =
                X509_find_by_issuer_and_serial(p7->d.sign->cert,
                                               ias->issuer, ias->serial);
        if (!signer) {
            PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,
                     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(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
                     int flags)
{
    PKCS7 *p7;
    BIO *p7bio = NULL;
    int i;
    X509 *x509;
    if ((p7 = PKCS7_new()) == NULL) {
        PKCS7err(PKCS7_F_PKCS7_ENCRYPT, ERR_R_MALLOC_FAILURE);
        return NULL;
    }

    if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
        goto err;
    if (!PKCS7_set_cipher(p7, cipher)) {
        PKCS7err(PKCS7_F_PKCS7_ENCRYPT, 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)) {
            PKCS7err(PKCS7_F_PKCS7_ENCRYPT, 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;

}

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) {
        PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_INVALID_NULL_POINTER);
        return 0;
    }

    if (!PKCS7_type_is_enveloped(p7)) {
        PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_WRONG_CONTENT_TYPE);
        return 0;
    }

    if (cert && !X509_check_private_key(cert, pkey)) {
        PKCS7err(PKCS7_F_PKCS7_DECRYPT,
                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
        return 0;
    }

    if ((tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert)) == NULL) {
        PKCS7err(PKCS7_F_PKCS7_DECRYPT, 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) {
            PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
            BIO_free_all(tmpmem);
            return 0;
        }
        if ((bread = BIO_push(tmpbuf, tmpmem)) == NULL) {
            PKCS7err(PKCS7_F_PKCS7_DECRYPT, 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))
                ret = 0;
        }
        BIO_free_all(bread);
        return ret;
    }
    if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
        PKCS7err(PKCS7_F_PKCS7_DECRYPT, 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))
                    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	/*
454afd98	2	* Copyright 1999-2020 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>
	15	#include <openssl/x509v3.h>
	16
8e704858 RS	17	#define BUFFERSIZE 4096
8e704858 RS	18
852c2ed2 RS	19	DEFINE_STACK_OF(X509)
	20	DEFINE_STACK_OF(X509_ATTRIBUTE)
	21	DEFINE_STACK_OF(X509_ALGOR)
	22	DEFINE_STACK_OF(PKCS7_SIGNER_INFO)
	23
55311921 DSH	24	static int pkcs7_copy_existing_digest(PKCS7 p7, PKCS7_SIGNER_INFO si);
55311921 DSH	25
5a9a4b29	26	PKCS7 PKCS7_sign(X509 signcert, EVP_PKEY pkey, STACK_OF(X509) certs,
0f113f3e	27	BIO *data, int flags)
5a9a4b29	28	{
0f113f3e MC	29	PKCS7 *p7;
	30	int i;
	31
75ebbd9a	32	if ((p7 = PKCS7_new()) == NULL) {
0f113f3e MC	33	PKCS7err(PKCS7_F_PKCS7_SIGN, ERR_R_MALLOC_FAILURE);
	34	return NULL;
	35	}
	36
	37	if (!PKCS7_set_type(p7, NID_pkcs7_signed))
	38	goto err;
	39
	40	if (!PKCS7_content_new(p7, NID_pkcs7_data))
	41	goto err;
	42
	43	if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags)) {
	44	PKCS7err(PKCS7_F_PKCS7_SIGN, PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
	45	goto err;
	46	}
	47
	48	if (!(flags & PKCS7_NOCERTS)) {
	49	for (i = 0; i < sk_X509_num(certs); i++) {
	50	if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
	51	goto err;
	52	}
	53	}
	54
	55	if (flags & PKCS7_DETACHED)
	56	PKCS7_set_detached(p7, 1);
	57
	58	if (flags & (PKCS7_STREAM \| PKCS7_PARTIAL))
	59	return p7;
	60
	61	if (PKCS7_final(p7, data, flags))
	62	return p7;
	63
	64	err:
	65	PKCS7_free(p7);
	66	return NULL;
60f20632 DSH	67	}
	68
	69	int PKCS7_final(PKCS7 p7, BIO data, int flags)
0f113f3e MC	70	{
	71	BIO *p7bio;
	72	int ret = 0;
8e704858	73
75ebbd9a	74	if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
0f113f3e MC	75	PKCS7err(PKCS7_F_PKCS7_FINAL, ERR_R_MALLOC_FAILURE);
	76	return 0;
	77	}
60f20632	78
0f113f3e	79	SMIME_crlf_copy(data, p7bio, flags);
994df5a2	80
0f113f3e	81	(void)BIO_flush(p7bio);
60f20632	82
0f113f3e MC	83	if (!PKCS7_dataFinal(p7, p7bio)) {
	84	PKCS7err(PKCS7_F_PKCS7_FINAL, PKCS7_R_PKCS7_DATASIGN);
	85	goto err;
	86	}
5a9a4b29	87
0f113f3e	88	ret = 1;
60f20632	89
0f113f3e MC	90	err:
0f113f3e MC	91	BIO_free_all(p7bio);
60f20632	92
0f113f3e	93	return ret;
27068df7	94
0f113f3e	95	}
27068df7	96
60f20632	97	/* Check to see if a cipher exists and if so add S/MIME capabilities */
27068df7	98
60f20632	99	static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
0f113f3e MC	100	{
	101	if (EVP_get_cipherbynid(nid))
	102	return PKCS7_simple_smimecap(sk, nid, arg);
	103	return 1;
	104	}
5a9a4b29	105
61e5ec4b	106	static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
0f113f3e MC	107	{
	108	if (EVP_get_digestbynid(nid))
	109	return PKCS7_simple_smimecap(sk, nid, arg);
	110	return 1;
	111	}
61e5ec4b	112
60f20632	113	PKCS7_SIGNER_INFO PKCS7_sign_add_signer(PKCS7 p7, X509 *signcert,
0f113f3e MC	114	EVP_PKEY pkey, const EVP_MD md,
	115	int flags)
	116	{
	117	PKCS7_SIGNER_INFO *si = NULL;
	118	STACK_OF(X509_ALGOR) *smcap = NULL;
	119	if (!X509_check_private_key(signcert, pkey)) {
	120	PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
	121	PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
	122	return NULL;
	123	}
	124
75ebbd9a	125	if ((si = PKCS7_add_signature(p7, signcert, pkey, md)) == NULL) {
0f113f3e MC	126	PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
	127	PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
	128	return NULL;
	129	}
	130
	131	if (!(flags & PKCS7_NOCERTS)) {
	132	if (!PKCS7_add_certificate(p7, signcert))
	133	goto err;
	134	}
	135
	136	if (!(flags & PKCS7_NOATTR)) {
	137	if (!PKCS7_add_attrib_content_type(si, NULL))
	138	goto err;
	139	/* Add SMIMECapabilities */
	140	if (!(flags & PKCS7_NOSMIMECAP)) {
75ebbd9a	141	if ((smcap = sk_X509_ALGOR_new_null()) == NULL) {
0f113f3e MC	142	PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER, ERR_R_MALLOC_FAILURE);
	143	goto err;
	144	}
	145	if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
c58f3e42 MC	146	\|\| !add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
c58f3e42 MC	147	\|\| !add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
0f113f3e MC	148	\|\| !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
	149	\|\| !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
	150	\|\| !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
	151	\|\| !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
	152	\|\| !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
	153	\|\| !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
	154	\|\| !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
	155	\|\| !add_cipher_smcap(smcap, NID_des_cbc, -1)
	156	\|\| !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
	157	\|\| !PKCS7_add_attrib_smimecap(si, smcap))
	158	goto err;
	159	sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
	160	smcap = NULL;
	161	}
	162	if (flags & PKCS7_REUSE_DIGEST) {
	163	if (!pkcs7_copy_existing_digest(p7, si))
	164	goto err;
	165	if (!(flags & PKCS7_PARTIAL) && !PKCS7_SIGNER_INFO_sign(si))
	166	goto err;
	167	}
	168	}
	169	return si;
	170	err:
222561fe	171	sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
0f113f3e MC	172	return NULL;
	173	}
	174
	175	/*
	176	* Search for a digest matching SignerInfo digest type and if found copy
	177	* across.
55311921 DSH	178	*/
	179
	180	static int pkcs7_copy_existing_digest(PKCS7 p7, PKCS7_SIGNER_INFO si)
0f113f3e MC	181	{
	182	int i;
	183	STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
	184	PKCS7_SIGNER_INFO *sitmp;
	185	ASN1_OCTET_STRING *osdig = NULL;
	186	sinfos = PKCS7_get_signer_info(p7);
	187	for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
	188	sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
	189	if (si == sitmp)
	190	break;
	191	if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
	192	continue;
	193	if (!OBJ_cmp(si->digest_alg->algorithm, sitmp->digest_alg->algorithm)) {
	194	osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
	195	break;
	196	}
	197
	198	}
	199
	200	if (osdig)
	201	return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
	202
	203	PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST,
	204	PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
	205	return 0;
	206	}
55311921	207
5a9a4b29	208	int PKCS7_verify(PKCS7 p7, STACK_OF(X509) certs, X509_STORE *store,
0f113f3e	209	BIO indata, BIO out, int flags)
5a9a4b29	210	{
0f113f3e MC	211	STACK_OF(X509) *signers;
	212	X509 *signer;
	213	STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
	214	PKCS7_SIGNER_INFO *si;
f0e0fd51	215	X509_STORE_CTX *cert_ctx = NULL;
8e704858	216	char *buf = NULL;
0f113f3e	217	int i, j = 0, k, ret = 0;
55500ea7 AG	218	BIO *p7bio = NULL;
55500ea7 AG	219	BIO tmpin = NULL, tmpout = NULL;
0f113f3e	220
12a765a5	221	if (p7 == NULL) {
0f113f3e MC	222	PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_INVALID_NULL_POINTER);
	223	return 0;
	224	}
	225
	226	if (!PKCS7_type_is_signed(p7)) {
	227	PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_WRONG_CONTENT_TYPE);
	228	return 0;
	229	}
	230
	231	/* Check for no data and no content: no data to verify signature */
	232	if (PKCS7_get_detached(p7) && !indata) {
	233	PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_NO_CONTENT);
	234	return 0;
	235	}
02a938c9	236
6b2ebe43 RS	237	if (flags & PKCS7_NO_DUAL_CONTENT) {
	238	/*
	239	* This was originally "#if 0" because we thought that only old broken
	240	* Netscape did this. It turns out that Authenticode uses this kind
	241	* of "extended" PKCS7 format, and things like UEFI secure boot and
	242	* tools like osslsigncode need it. In Authenticode the verification
	243	* process is different, but the existing PKCs7 verification works.
	244	*/
	245	if (!PKCS7_get_detached(p7) && indata) {
	246	PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_CONTENT_AND_DATA_PRESENT);
	247	return 0;
	248	}
0f113f3e	249	}
5a9a4b29	250
0f113f3e MC	251	sinfos = PKCS7_get_signer_info(p7);
	252
	253	if (!sinfos \|\| !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
	254	PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_NO_SIGNATURES_ON_DATA);
	255	return 0;
	256	}
	257
	258	signers = PKCS7_get0_signers(p7, certs, flags);
0f113f3e MC	259	if (!signers)
	260	return 0;
	261
	262	/* Now verify the certificates */
	263
f0e0fd51 RS	264	cert_ctx = X509_STORE_CTX_new();
	265	if (cert_ctx == NULL)
	266	goto err;
0f113f3e MC	267	if (!(flags & PKCS7_NOVERIFY))
	268	for (k = 0; k < sk_X509_num(signers); k++) {
	269	signer = sk_X509_value(signers, k);
	270	if (!(flags & PKCS7_NOCHAIN)) {
f0e0fd51	271	if (!X509_STORE_CTX_init(cert_ctx, store, signer,
0f113f3e MC	272	p7->d.sign->cert)) {
0f113f3e MC	273	PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_X509_LIB);
55500ea7	274	goto err;
0f113f3e	275	}
f0e0fd51 RS	276	X509_STORE_CTX_set_default(cert_ctx, "smime_sign");
f0e0fd51 RS	277	} else if (!X509_STORE_CTX_init(cert_ctx, store, signer, NULL)) {
0f113f3e	278	PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_X509_LIB);
55500ea7	279	goto err;
0f113f3e MC	280	}
0f113f3e MC	281	if (!(flags & PKCS7_NOCRL))
f0e0fd51 RS	282	X509_STORE_CTX_set0_crls(cert_ctx, p7->d.sign->crl);
f0e0fd51 RS	283	i = X509_verify_cert(cert_ctx);
0f113f3e	284	if (i <= 0)
f0e0fd51	285	j = X509_STORE_CTX_get_error(cert_ctx);
36c6f0ad	286	X509_STORE_CTX_cleanup(cert_ctx);
0f113f3e MC	287	if (i <= 0) {
	288	PKCS7err(PKCS7_F_PKCS7_VERIFY,
	289	PKCS7_R_CERTIFICATE_VERIFY_ERROR);
	290	ERR_add_error_data(2, "Verify error:",
	291	X509_verify_cert_error_string(j));
55500ea7	292	goto err;
0f113f3e MC	293	}
	294	/* Check for revocation status here */
	295	}
	296
	297	/*
	298	* Performance optimization: if the content is a memory BIO then store
	299	* its contents in a temporary read only memory BIO. This avoids
	300	* potentially large numbers of slow copies of data which will occur when
	301	* reading from a read write memory BIO when signatures are calculated.
	302	*/
	303
	304	if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) {
	305	char *ptr;
	306	long len;
	307	len = BIO_get_mem_data(indata, &ptr);
	308	tmpin = BIO_new_mem_buf(ptr, len);
	309	if (tmpin == NULL) {
	310	PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_MALLOC_FAILURE);
55500ea7	311	goto err;
0f113f3e MC	312	}
	313	} else
	314	tmpin = indata;
	315
75ebbd9a	316	if ((p7bio = PKCS7_dataInit(p7, tmpin)) == NULL)
0f113f3e MC	317	goto err;
	318
	319	if (flags & PKCS7_TEXT) {
75ebbd9a	320	if ((tmpout = BIO_new(BIO_s_mem())) == NULL) {
0f113f3e MC	321	PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_MALLOC_FAILURE);
	322	goto err;
	323	}
	324	BIO_set_mem_eof_return(tmpout, 0);
	325	} else
	326	tmpout = out;
	327
	328	/* We now have to 'read' from p7bio to calculate digests etc. */
8e704858 RS	329	if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
	330	PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_MALLOC_FAILURE);
	331	goto err;
	332	}
0f113f3e	333	for (;;) {
8e704858	334	i = BIO_read(p7bio, buf, BUFFERSIZE);
0f113f3e MC	335	if (i <= 0)
	336	break;
	337	if (tmpout)
	338	BIO_write(tmpout, buf, i);
	339	}
	340
	341	if (flags & PKCS7_TEXT) {
	342	if (!SMIME_text(tmpout, out)) {
	343	PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_SMIME_TEXT_ERROR);
	344	BIO_free(tmpout);
	345	goto err;
	346	}
	347	BIO_free(tmpout);
	348	}
	349
	350	/* Now Verify All Signatures */
	351	if (!(flags & PKCS7_NOSIGS))
	352	for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
	353	si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
	354	signer = sk_X509_value(signers, i);
	355	j = PKCS7_signatureVerify(p7bio, p7, si, signer);
	356	if (j <= 0) {
	357	PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_SIGNATURE_FAILURE);
	358	goto err;
	359	}
	360	}
	361
	362	ret = 1;
	363
	364	err:
f0e0fd51	365	X509_STORE_CTX_free(cert_ctx);
8e704858	366	OPENSSL_free(buf);
0f113f3e MC	367	if (tmpin == indata) {
	368	if (indata)
	369	BIO_pop(p7bio);
	370	}
	371	BIO_free_all(p7bio);
0f113f3e	372	sk_X509_free(signers);
0f113f3e	373	return ret;
5a9a4b29 DSH	374	}
5a9a4b29 DSH	375
0f113f3e MC	376	STACK_OF(X509) PKCS7_get0_signers(PKCS7 p7, STACK_OF(X509) *certs,
0f113f3e MC	377	int flags)
55ec5861	378	{
0f113f3e MC	379	STACK_OF(X509) *signers;
	380	STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
	381	PKCS7_SIGNER_INFO *si;
	382	PKCS7_ISSUER_AND_SERIAL *ias;
	383	X509 *signer;
	384	int i;
	385
12a765a5	386	if (p7 == NULL) {
0f113f3e MC	387	PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_INVALID_NULL_POINTER);
	388	return NULL;
	389	}
	390
	391	if (!PKCS7_type_is_signed(p7)) {
	392	PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_WRONG_CONTENT_TYPE);
	393	return NULL;
	394	}
	395
	396	/* Collect all the signers together */
	397
	398	sinfos = PKCS7_get_signer_info(p7);
	399
	400	if (sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
	401	PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_NO_SIGNERS);
	402	return 0;
	403	}
	404
75ebbd9a	405	if ((signers = sk_X509_new_null()) == NULL) {
0f113f3e MC	406	PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, ERR_R_MALLOC_FAILURE);
	407	return NULL;
	408	}
	409
	410	for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
	411	si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
	412	ias = si->issuer_and_serial;
	413	signer = NULL;
	414	/* If any certificates passed they take priority */
	415	if (certs)
	416	signer = X509_find_by_issuer_and_serial(certs,
	417	ias->issuer, ias->serial);
	418	if (!signer && !(flags & PKCS7_NOINTERN)
	419	&& p7->d.sign->cert)
	420	signer =
	421	X509_find_by_issuer_and_serial(p7->d.sign->cert,
	422	ias->issuer, ias->serial);
	423	if (!signer) {
	424	PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,
	425	PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
	426	sk_X509_free(signers);
	427	return 0;
	428	}
	429
	430	if (!sk_X509_push(signers, signer)) {
	431	sk_X509_free(signers);
	432	return NULL;
	433	}
	434	}
	435	return signers;
55ec5861 DSH	436	}
55ec5861 DSH	437
5a9a4b29 DSH	438	/* Build a complete PKCS#7 enveloped data */
5a9a4b29 DSH	439
13588350	440	PKCS7 PKCS7_encrypt(STACK_OF(X509) certs, BIO in, const EVP_CIPHER cipher,
0f113f3e	441	int flags)
5a9a4b29	442	{
0f113f3e MC	443	PKCS7 *p7;
	444	BIO *p7bio = NULL;
	445	int i;
	446	X509 *x509;
75ebbd9a	447	if ((p7 = PKCS7_new()) == NULL) {
0f113f3e MC	448	PKCS7err(PKCS7_F_PKCS7_ENCRYPT, ERR_R_MALLOC_FAILURE);
	449	return NULL;
	450	}
	451
	452	if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
	453	goto err;
	454	if (!PKCS7_set_cipher(p7, cipher)) {
	455	PKCS7err(PKCS7_F_PKCS7_ENCRYPT, PKCS7_R_ERROR_SETTING_CIPHER);
	456	goto err;
	457	}
	458
	459	for (i = 0; i < sk_X509_num(certs); i++) {
	460	x509 = sk_X509_value(certs, i);
	461	if (!PKCS7_add_recipient(p7, x509)) {
	462	PKCS7err(PKCS7_F_PKCS7_ENCRYPT, PKCS7_R_ERROR_ADDING_RECIPIENT);
	463	goto err;
	464	}
	465	}
	466
	467	if (flags & PKCS7_STREAM)
	468	return p7;
	469
	470	if (PKCS7_final(p7, in, flags))
	471	return p7;
	472
	473	err:
	474
	475	BIO_free_all(p7bio);
	476	PKCS7_free(p7);
	477	return NULL;
5a9a4b29 DSH	478
	479	}
	480
	481	int PKCS7_decrypt(PKCS7 p7, EVP_PKEY pkey, X509 cert, BIO data, int flags)
	482	{
0f113f3e	483	BIO *tmpmem;
29717229	484	int ret = 0, i;
8e704858	485	char *buf = NULL;
0f113f3e	486
12a765a5	487	if (p7 == NULL) {
0f113f3e MC	488	PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_INVALID_NULL_POINTER);
	489	return 0;
	490	}
	491
	492	if (!PKCS7_type_is_enveloped(p7)) {
	493	PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_WRONG_CONTENT_TYPE);
	494	return 0;
	495	}
	496
	497	if (cert && !X509_check_private_key(cert, pkey)) {
	498	PKCS7err(PKCS7_F_PKCS7_DECRYPT,
	499	PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
	500	return 0;
	501	}
	502
75ebbd9a	503	if ((tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert)) == NULL) {
0f113f3e MC	504	PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
	505	return 0;
	506	}
	507
	508	if (flags & PKCS7_TEXT) {
	509	BIO tmpbuf, bread;
	510	/* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
75ebbd9a	511	if ((tmpbuf = BIO_new(BIO_f_buffer())) == NULL) {
0f113f3e MC	512	PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
	513	BIO_free_all(tmpmem);
	514	return 0;
	515	}
75ebbd9a	516	if ((bread = BIO_push(tmpbuf, tmpmem)) == NULL) {
0f113f3e MC	517	PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
	518	BIO_free_all(tmpbuf);
	519	BIO_free_all(tmpmem);
	520	return 0;
	521	}
	522	ret = SMIME_text(bread, data);
	523	if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
	524	if (!BIO_get_cipher_status(tmpmem))
	525	ret = 0;
	526	}
	527	BIO_free_all(bread);
	528	return ret;
8e704858 RS	529	}
	530	if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
	531	PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
	532	goto err;
	533	}
	534	for (;;) {
	535	i = BIO_read(tmpmem, buf, BUFFERSIZE);
	536	if (i <= 0) {
	537	ret = 1;
	538	if (BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
	539	if (!BIO_get_cipher_status(tmpmem))
	540	ret = 0;
0f113f3e	541	}
8e704858 RS	542
	543	break;
	544	}
	545	if (BIO_write(data, buf, i) != i) {
8e704858	546	break;
0f113f3e	547	}
0f113f3e	548	}
8e704858 RS	549	err:
	550	OPENSSL_free(buf);
	551	BIO_free_all(tmpmem);
	552	return ret;
5a9a4b29	553	}