/src/openssl/crypto/pkcs7/pk7_smime.c

Source (jump to first uncovered line)
/*
 * Copyright 1999-2022 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;
}

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;
    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) {
        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) {
            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;
                }
                if (!X509_STORE_CTX_set_default(cert_ctx, "smime_sign"))
                    goto err;
            } 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 */
        }

    /*
     * 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 = (len == 0) ? indata : BIO_new_mem_buf(ptr, len);
        if (tmpin == NULL) {
            ERR_raise(ERR_LIB_PKCS7, 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) {
            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 (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) {
        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)
            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) {
            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;
}

Coverage Report

Created: 2025-04-22 06:18

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 1999-2022 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the Apache License 2.0 (the "License"). You may not use
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
8		*/
9
10		/* Simple PKCS#7 processing functions */
11
12		#include <stdio.h>
13		#include "internal/cryptlib.h"
14		#include <openssl/x509.h>
15		#include <openssl/x509v3.h>
16		#include "pk7_local.h"
17
18	0	#define BUFFERSIZE 4096
19
20
21		static int pkcs7_copy_existing_digest(PKCS7 p7, PKCS7_SIGNER_INFO si);
22
23		PKCS7 PKCS7_sign_ex(X509 signcert, EVP_PKEY pkey, STACK_OF(X509) certs,
24		BIO data, int flags, OSSL_LIB_CTX libctx,
25		const char *propq)
26	0	{
27	0	PKCS7 *p7;
28	0	int i;
29
30	0	if ((p7 = PKCS7_new_ex(libctx, propq)) == NULL) {
31	0	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
32	0	return NULL;
33	0	}
34
35	0	if (!PKCS7_set_type(p7, NID_pkcs7_signed))
36	0	goto err;
37
38	0	if (!PKCS7_content_new(p7, NID_pkcs7_data))
39	0	goto err;
40
41	0	if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags)) {
42	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
43	0	goto err;
44	0	}
45
46	0	if (!(flags & PKCS7_NOCERTS)) {
47	0	for (i = 0; i < sk_X509_num(certs); i++) {
48	0	if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
49	0	goto err;
50	0	}
51	0	}
52
53	0	if (flags & PKCS7_DETACHED)
54	0	PKCS7_set_detached(p7, 1);
55
56	0	if (flags & (PKCS7_STREAM \| PKCS7_PARTIAL))
57	0	return p7;
58
59	0	if (PKCS7_final(p7, data, flags))
60	0	return p7;
61
62	0	err:
63	0	PKCS7_free(p7);
64	0	return NULL;
65	0	}
66
67		PKCS7 PKCS7_sign(X509 signcert, EVP_PKEY pkey, STACK_OF(X509) certs,
68		BIO *data, int flags)
69	0	{
70	0	return PKCS7_sign_ex(signcert, pkey, certs, data, flags, NULL, NULL);
71	0	}
72
73
74		int PKCS7_final(PKCS7 p7, BIO data, int flags)
75	0	{
76	0	BIO *p7bio;
77	0	int ret = 0;
78
79	0	if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
80	0	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
81	0	return 0;
82	0	}
83
84	0	if (!SMIME_crlf_copy(data, p7bio, flags))
85	0	goto err;
86
87	0	(void)BIO_flush(p7bio);
88
89	0	if (!PKCS7_dataFinal(p7, p7bio)) {
90	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_DATASIGN);
91	0	goto err;
92	0	}
93	0	ret = 1;
94	0	err:
95	0	BIO_free_all(p7bio);
96
97	0	return ret;
98
99	0	}
100
101		/* Check to see if a cipher exists and if so add S/MIME capabilities */
102
103		static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
104	0	{
105	0	if (EVP_get_cipherbynid(nid))
106	0	return PKCS7_simple_smimecap(sk, nid, arg);
107	0	return 1;
108	0	}
109
110		static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
111	0	{
112	0	if (EVP_get_digestbynid(nid))
113	0	return PKCS7_simple_smimecap(sk, nid, arg);
114	0	return 1;
115	0	}
116
117		PKCS7_SIGNER_INFO PKCS7_sign_add_signer(PKCS7 p7, X509 *signcert,
118		EVP_PKEY pkey, const EVP_MD md,
119		int flags)
120	0	{
121	0	PKCS7_SIGNER_INFO *si = NULL;
122	0	STACK_OF(X509_ALGOR) *smcap = NULL;
123
124	0	if (!X509_check_private_key(signcert, pkey)) {
125	0	ERR_raise(ERR_LIB_PKCS7,
126	0	PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
127	0	return NULL;
128	0	}
129
130	0	if ((si = PKCS7_add_signature(p7, signcert, pkey, md)) == NULL) {
131	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
132	0	return NULL;
133	0	}
134
135	0	si->ctx = ossl_pkcs7_get0_ctx(p7);
136	0	if (!(flags & PKCS7_NOCERTS)) {
137	0	if (!PKCS7_add_certificate(p7, signcert))
138	0	goto err;
139	0	}
140
141	0	if (!(flags & PKCS7_NOATTR)) {
142	0	if (!PKCS7_add_attrib_content_type(si, NULL))
143	0	goto err;
144		/* Add SMIMECapabilities */
145	0	if (!(flags & PKCS7_NOSMIMECAP)) {
146	0	if ((smcap = sk_X509_ALGOR_new_null()) == NULL) {
147	0	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
148	0	goto err;
149	0	}
150	0	if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
151	0	\|\| !add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
152	0	\|\| !add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
153	0	\|\| !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
154	0	\|\| !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
155	0	\|\| !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
156	0	\|\| !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
157	0	\|\| !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
158	0	\|\| !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
159	0	\|\| !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
160	0	\|\| !add_cipher_smcap(smcap, NID_des_cbc, -1)
161	0	\|\| !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
162	0	\|\| !PKCS7_add_attrib_smimecap(si, smcap))
163	0	goto err;
164	0	sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
165	0	smcap = NULL;
166	0	}
167	0	if (flags & PKCS7_REUSE_DIGEST) {
168	0	if (!pkcs7_copy_existing_digest(p7, si))
169	0	goto err;
170	0	if (!(flags & PKCS7_PARTIAL)
171	0	&& !PKCS7_SIGNER_INFO_sign(si))
172	0	goto err;
173	0	}
174	0	}
175	0	return si;
176	0	err:
177	0	sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
178	0	return NULL;
179	0	}
180
181		/*
182		* Search for a digest matching SignerInfo digest type and if found copy
183		* across.
184		*/
185
186		static int pkcs7_copy_existing_digest(PKCS7 p7, PKCS7_SIGNER_INFO si)
187	0	{
188	0	int i;
189	0	STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
190	0	PKCS7_SIGNER_INFO *sitmp;
191	0	ASN1_OCTET_STRING *osdig = NULL;
192	0	sinfos = PKCS7_get_signer_info(p7);
193	0	for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
194	0	sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
195	0	if (si == sitmp)
196	0	break;
197	0	if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
198	0	continue;
199	0	if (!OBJ_cmp(si->digest_alg->algorithm, sitmp->digest_alg->algorithm)) {
200	0	osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
201	0	break;
202	0	}
203
204	0	}
205
206	0	if (osdig != NULL)
207	0	return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
208
209	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
210	0	return 0;
211	0	}
212
213		int PKCS7_verify(PKCS7 p7, STACK_OF(X509) certs, X509_STORE *store,
214		BIO indata, BIO out, int flags)
215	0	{
216	0	STACK_OF(X509) *signers;
217	0	X509 *signer;
218	0	STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
219	0	PKCS7_SIGNER_INFO *si;
220	0	X509_STORE_CTX *cert_ctx = NULL;
221	0	char *buf = NULL;
222	0	int i, j = 0, k, ret = 0;
223	0	BIO *p7bio = NULL;
224	0	BIO tmpin = NULL, tmpout = NULL;
225	0	const PKCS7_CTX *p7_ctx;
226
227	0	if (p7 == NULL) {
228	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
229	0	return 0;
230	0	}
231
232	0	if (!PKCS7_type_is_signed(p7)) {
233	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE);
234	0	return 0;
235	0	}
236
237		/* Check for no data and no content: no data to verify signature */
238	0	if (PKCS7_get_detached(p7) && !indata) {
239	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
240	0	return 0;
241	0	}
242
243	0	if (flags & PKCS7_NO_DUAL_CONTENT) {
244		/*
245		* This was originally "#if 0" because we thought that only old broken
246		* Netscape did this. It turns out that Authenticode uses this kind
247		* of "extended" PKCS7 format, and things like UEFI secure boot and
248		* tools like osslsigncode need it. In Authenticode the verification
249		* process is different, but the existing PKCs7 verification works.
250		*/
251	0	if (!PKCS7_get_detached(p7) && indata) {
252	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_CONTENT_AND_DATA_PRESENT);
253	0	return 0;
254	0	}
255	0	}
256
257	0	sinfos = PKCS7_get_signer_info(p7);
258
259	0	if (!sinfos \|\| !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
260	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_SIGNATURES_ON_DATA);
261	0	return 0;
262	0	}
263
264	0	signers = PKCS7_get0_signers(p7, certs, flags);
265	0	if (signers == NULL)
266	0	return 0;
267
268		/* Now verify the certificates */
269	0	p7_ctx = ossl_pkcs7_get0_ctx(p7);
270	0	cert_ctx = X509_STORE_CTX_new_ex(ossl_pkcs7_ctx_get0_libctx(p7_ctx),
271	0	ossl_pkcs7_ctx_get0_propq(p7_ctx));
272	0	if (cert_ctx == NULL)
273	0	goto err;
274	0	if (!(flags & PKCS7_NOVERIFY))
275	0	for (k = 0; k < sk_X509_num(signers); k++) {
276	0	signer = sk_X509_value(signers, k);
277	0	if (!(flags & PKCS7_NOCHAIN)) {
278	0	if (!X509_STORE_CTX_init(cert_ctx, store, signer,
279	0	p7->d.sign->cert)) {
280	0	ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
281	0	goto err;
282	0	}
283	0	if (!X509_STORE_CTX_set_default(cert_ctx, "smime_sign"))
284	0	goto err;
285	0	} else if (!X509_STORE_CTX_init(cert_ctx, store, signer, NULL)) {
286	0	ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
287	0	goto err;
288	0	}
289	0	if (!(flags & PKCS7_NOCRL))
290	0	X509_STORE_CTX_set0_crls(cert_ctx, p7->d.sign->crl);
291	0	i = X509_verify_cert(cert_ctx);
292	0	if (i <= 0)
293	0	j = X509_STORE_CTX_get_error(cert_ctx);
294	0	if (i <= 0) {
295	0	ERR_raise_data(ERR_LIB_PKCS7, PKCS7_R_CERTIFICATE_VERIFY_ERROR,
296	0	"Verify error: %s",
297	0	X509_verify_cert_error_string(j));
298	0	goto err;
299	0	}
300		/* Check for revocation status here */
301	0	}
302
303		/*
304		* Performance optimization: if the content is a memory BIO then store
305		* its contents in a temporary read only memory BIO. This avoids
306		* potentially large numbers of slow copies of data which will occur when
307		* reading from a read write memory BIO when signatures are calculated.
308		*/
309
310	0	if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) {
311	0	char *ptr;
312	0	long len;
313	0	len = BIO_get_mem_data(indata, &ptr);
314	0	tmpin = (len == 0) ? indata : BIO_new_mem_buf(ptr, len);
315	0	if (tmpin == NULL) {
316	0	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
317	0	goto err;
318	0	}
319	0	} else
320	0	tmpin = indata;
321
322	0	if ((p7bio = PKCS7_dataInit(p7, tmpin)) == NULL)
323	0	goto err;
324
325	0	if (flags & PKCS7_TEXT) {
326	0	if ((tmpout = BIO_new(BIO_s_mem())) == NULL) {
327	0	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
328	0	goto err;
329	0	}
330	0	BIO_set_mem_eof_return(tmpout, 0);
331	0	} else
332	0	tmpout = out;
333
334		/* We now have to 'read' from p7bio to calculate digests etc. */
335	0	if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
336	0	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
337	0	goto err;
338	0	}
339	0	for (;;) {
340	0	i = BIO_read(p7bio, buf, BUFFERSIZE);
341	0	if (i <= 0)
342	0	break;
343	0	if (tmpout)
344	0	BIO_write(tmpout, buf, i);
345	0	}
346
347	0	if (flags & PKCS7_TEXT) {
348	0	if (!SMIME_text(tmpout, out)) {
349	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SMIME_TEXT_ERROR);
350	0	BIO_free(tmpout);
351	0	goto err;
352	0	}
353	0	BIO_free(tmpout);
354	0	}
355
356		/* Now Verify All Signatures */
357	0	if (!(flags & PKCS7_NOSIGS))
358	0	for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
359	0	si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
360	0	signer = sk_X509_value(signers, i);
361	0	j = PKCS7_signatureVerify(p7bio, p7, si, signer);
362	0	if (j <= 0) {
363	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNATURE_FAILURE);
364	0	goto err;
365	0	}
366	0	}
367
368	0	ret = 1;
369
370	0	err:
371	0	X509_STORE_CTX_free(cert_ctx);
372	0	OPENSSL_free(buf);
373	0	if (tmpin == indata) {
374	0	if (indata)
375	0	BIO_pop(p7bio);
376	0	}
377	0	BIO_free_all(p7bio);
378	0	sk_X509_free(signers);
379	0	return ret;
380	0	}
381
382		STACK_OF(X509) PKCS7_get0_signers(PKCS7 p7, STACK_OF(X509) *certs,
383		int flags)
384	0	{
385	0	STACK_OF(X509) *signers;
386	0	STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
387	0	PKCS7_SIGNER_INFO *si;
388	0	PKCS7_ISSUER_AND_SERIAL *ias;
389	0	X509 *signer;
390	0	int i;
391
392	0	if (p7 == NULL) {
393	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
394	0	return NULL;
395	0	}
396
397	0	if (!PKCS7_type_is_signed(p7)) {
398	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE);
399	0	return NULL;
400	0	}
401
402		/* Collect all the signers together */
403
404	0	sinfos = PKCS7_get_signer_info(p7);
405
406	0	if (sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
407	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_SIGNERS);
408	0	return 0;
409	0	}
410
411	0	if ((signers = sk_X509_new_null()) == NULL) {
412	0	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
413	0	return NULL;
414	0	}
415
416	0	for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
417	0	si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
418	0	ias = si->issuer_and_serial;
419	0	signer = NULL;
420		/* If any certificates passed they take priority */
421	0	if (certs)
422	0	signer = X509_find_by_issuer_and_serial(certs,
423	0	ias->issuer, ias->serial);
424	0	if (!signer && !(flags & PKCS7_NOINTERN)
425	0	&& p7->d.sign->cert)
426	0	signer =
427	0	X509_find_by_issuer_and_serial(p7->d.sign->cert,
428	0	ias->issuer, ias->serial);
429	0	if (!signer) {
430	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
431	0	sk_X509_free(signers);
432	0	return 0;
433	0	}
434
435	0	if (!sk_X509_push(signers, signer)) {
436	0	sk_X509_free(signers);
437	0	return NULL;
438	0	}
439	0	}
440	0	return signers;
441	0	}
442
443		/* Build a complete PKCS#7 enveloped data */
444
445		PKCS7 PKCS7_encrypt_ex(STACK_OF(X509) certs, BIO *in,
446		const EVP_CIPHER *cipher, int flags,
447		OSSL_LIB_CTX libctx, const char propq)
448	0	{
449	0	PKCS7 *p7;
450	0	BIO *p7bio = NULL;
451	0	int i;
452	0	X509 *x509;
453
454	0	if ((p7 = PKCS7_new_ex(libctx, propq)) == NULL) {
455	0	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
456	0	return NULL;
457	0	}
458
459	0	if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
460	0	goto err;
461	0	if (!PKCS7_set_cipher(p7, cipher)) {
462	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_ERROR_SETTING_CIPHER);
463	0	goto err;
464	0	}
465
466	0	for (i = 0; i < sk_X509_num(certs); i++) {
467	0	x509 = sk_X509_value(certs, i);
468	0	if (!PKCS7_add_recipient(p7, x509)) {
469	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_ERROR_ADDING_RECIPIENT);
470	0	goto err;
471	0	}
472	0	}
473
474	0	if (flags & PKCS7_STREAM)
475	0	return p7;
476
477	0	if (PKCS7_final(p7, in, flags))
478	0	return p7;
479
480	0	err:
481
482	0	BIO_free_all(p7bio);
483	0	PKCS7_free(p7);
484	0	return NULL;
485
486	0	}
487
488		PKCS7 PKCS7_encrypt(STACK_OF(X509) certs, BIO in, const EVP_CIPHER cipher,
489		int flags)
490	0	{
491	0	return PKCS7_encrypt_ex(certs, in, cipher, flags, NULL, NULL);
492	0	}
493
494
495		int PKCS7_decrypt(PKCS7 p7, EVP_PKEY pkey, X509 cert, BIO data, int flags)
496	0	{
497	0	BIO *tmpmem;
498	0	int ret = 0, i;
499	0	char *buf = NULL;
500
501	0	if (p7 == NULL) {
502	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
503	0	return 0;
504	0	}
505
506	0	if (!PKCS7_type_is_enveloped(p7)) {
507	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE);
508	0	return 0;
509	0	}
510
511	0	if (cert && !X509_check_private_key(cert, pkey)) {
512	0	ERR_raise(ERR_LIB_PKCS7,
513	0	PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
514	0	return 0;
515	0	}
516
517	0	if ((tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert)) == NULL) {
518	0	ERR_raise(ERR_LIB_PKCS7, PKCS7_R_DECRYPT_ERROR);
519	0	return 0;
520	0	}
521
522	0	if (flags & PKCS7_TEXT) {
523	0	BIO tmpbuf, bread;
524		/* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
525	0	if ((tmpbuf = BIO_new(BIO_f_buffer())) == NULL) {
526	0	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
527	0	BIO_free_all(tmpmem);
528	0	return 0;
529	0	}
530	0	if ((bread = BIO_push(tmpbuf, tmpmem)) == NULL) {
531	0	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
532	0	BIO_free_all(tmpbuf);
533	0	BIO_free_all(tmpmem);
534	0	return 0;
535	0	}
536	0	ret = SMIME_text(bread, data);
537	0	if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
538	0	if (BIO_get_cipher_status(tmpmem) <= 0)
539	0	ret = 0;
540	0	}
541	0	BIO_free_all(bread);
542	0	return ret;
543	0	}
544	0	if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
545	0	ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
546	0	goto err;
547	0	}
548	0	for (;;) {
549	0	i = BIO_read(tmpmem, buf, BUFFERSIZE);
550	0	if (i <= 0) {
551	0	ret = 1;
552	0	if (BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
553	0	if (BIO_get_cipher_status(tmpmem) <= 0)
554	0	ret = 0;
555	0	}
556
557	0	break;
558	0	}
559	0	if (BIO_write(data, buf, i) != i) {
560	0	break;
561	0	}
562	0	}
563	0	err:
564	0	OPENSSL_free(buf);
565	0	BIO_free_all(tmpmem);
566	0	return ret;
567	0	}