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openssl/crypto/cms/cms_smime.c
Bernd Edlinger 6d2a01cdfb Fix error handling in CMS_EncryptedData_encrypt 
That caused several memory leaks in case of error.
Also when the CMS object that is created by CMS_EncryptedData_encrypt
is not used in the normal way, but instead just deleted
by CMS_ContentInfo_free some memory was lost.

Fixes #21985

Reviewed-by: Todd Short <todd.short@me.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22031)
2024-05-06 10:13:20 +02:00

1006 lines
28 KiB
C
Raw Blame History

/*
* Copyright 2008-2023 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
*/
#include "internal/cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/cms.h>
#include "cms_local.h"
#include "crypto/asn1.h"
static BIO *cms_get_text_bio(BIO *out, unsigned int flags)
{
BIO *rbio;
if (out == NULL)
rbio = BIO_new(BIO_s_null());
else if (flags & CMS_TEXT) {
rbio = BIO_new(BIO_s_mem());
BIO_set_mem_eof_return(rbio, 0);
} else
rbio = out;
return rbio;
}
static int cms_copy_content(BIO *out, BIO *in, unsigned int flags)
{
unsigned char buf[4096];
int r = 0, i;
BIO *tmpout;
tmpout = cms_get_text_bio(out, flags);
if (tmpout == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
goto err;
}
/* Read all content through chain to process digest, decrypt etc */
for (;;) {
i = BIO_read(in, buf, sizeof(buf));
if (i <= 0) {
if (BIO_method_type(in) == BIO_TYPE_CIPHER) {
if (BIO_get_cipher_status(in) <= 0)
goto err;
}
if (i < 0)
goto err;
break;
}
if (tmpout != NULL && (BIO_write(tmpout, buf, i) != i))
goto err;
}
if (flags & CMS_TEXT) {
if (!SMIME_text(tmpout, out)) {
ERR_raise(ERR_LIB_CMS, CMS_R_SMIME_TEXT_ERROR);
goto err;
}
}
r = 1;
err:
if (tmpout != out)
BIO_free(tmpout);
return r;
}
static int check_content(CMS_ContentInfo *cms)
{
ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
if (pos == NULL || *pos == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT);
return 0;
}
return 1;
}
static void do_free_upto(BIO *f, BIO *upto)
{
if (upto != NULL) {
BIO *tbio;
do {
tbio = BIO_pop(f);
BIO_free(f);
f = tbio;
} while (f != NULL && f != upto);
} else {
BIO_free_all(f);
}
}
int CMS_data(CMS_ContentInfo *cms, BIO *out, unsigned int flags)
{
BIO *cont;
int r;
if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_data) {
ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_DATA);
return 0;
}
cont = CMS_dataInit(cms, NULL);
if (cont == NULL)
return 0;
r = cms_copy_content(out, cont, flags);
BIO_free_all(cont);
return r;
}
CMS_ContentInfo *CMS_data_create_ex(BIO *in, unsigned int flags,
OSSL_LIB_CTX *libctx, const char *propq)
{
CMS_ContentInfo *cms = ossl_cms_Data_create(libctx, propq);
if (cms == NULL)
return NULL;
if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
return cms;
CMS_ContentInfo_free(cms);
return NULL;
}
CMS_ContentInfo *CMS_data_create(BIO *in, unsigned int flags)
{
return CMS_data_create_ex(in, flags, NULL, NULL);
}
int CMS_digest_verify(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
unsigned int flags)
{
BIO *cont;
int r;
if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_digest) {
ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_DIGESTED_DATA);
return 0;
}
if (dcont == NULL && !check_content(cms))
return 0;
cont = CMS_dataInit(cms, dcont);
if (cont == NULL)
return 0;
r = cms_copy_content(out, cont, flags);
if (r)
r = ossl_cms_DigestedData_do_final(cms, cont, 1);
do_free_upto(cont, dcont);
return r;
}
CMS_ContentInfo *CMS_digest_create_ex(BIO *in, const EVP_MD *md,
unsigned int flags, OSSL_LIB_CTX *ctx,
const char *propq)
{
CMS_ContentInfo *cms;
/*
* Because the EVP_MD is cached and can be a legacy algorithm, we
* cannot fetch the algorithm if it isn't supplied.
*/
if (md == NULL)
md = EVP_sha1();
cms = ossl_cms_DigestedData_create(md, ctx, propq);
if (cms == NULL)
return NULL;
if (!(flags & CMS_DETACHED))
CMS_set_detached(cms, 0);
if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
return cms;
CMS_ContentInfo_free(cms);
return NULL;
}
CMS_ContentInfo *CMS_digest_create(BIO *in, const EVP_MD *md,
unsigned int flags)
{
return CMS_digest_create_ex(in, md, flags, NULL, NULL);
}
int CMS_EncryptedData_decrypt(CMS_ContentInfo *cms,
const unsigned char *key, size_t keylen,
BIO *dcont, BIO *out, unsigned int flags)
{
BIO *cont;
int r;
if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_encrypted) {
ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_ENCRYPTED_DATA);
return 0;
}
if (dcont == NULL && !check_content(cms))
return 0;
if (CMS_EncryptedData_set1_key(cms, NULL, key, keylen) <= 0)
return 0;
cont = CMS_dataInit(cms, dcont);
if (cont == NULL)
return 0;
r = cms_copy_content(out, cont, flags);
do_free_upto(cont, dcont);
return r;
}
CMS_ContentInfo *CMS_EncryptedData_encrypt_ex(BIO *in, const EVP_CIPHER *cipher,
const unsigned char *key,
size_t keylen, unsigned int flags,
OSSL_LIB_CTX *libctx,
const char *propq)
{
CMS_ContentInfo *cms;
if (cipher == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_CIPHER);
return NULL;
}
cms = CMS_ContentInfo_new_ex(libctx, propq);
if (cms == NULL)
return NULL;
if (!CMS_EncryptedData_set1_key(cms, cipher, key, keylen))
goto err;
if (!(flags & CMS_DETACHED))
CMS_set_detached(cms, 0);
if ((flags & (CMS_STREAM | CMS_PARTIAL))
|| CMS_final(cms, in, NULL, flags))
return cms;
err:
CMS_ContentInfo_free(cms);
return NULL;
}
CMS_ContentInfo *CMS_EncryptedData_encrypt(BIO *in, const EVP_CIPHER *cipher,
const unsigned char *key,
size_t keylen, unsigned int flags)
{
return CMS_EncryptedData_encrypt_ex(in, cipher, key, keylen, flags, NULL,
NULL);
}
static int cms_signerinfo_verify_cert(CMS_SignerInfo *si,
X509_STORE *store,
STACK_OF(X509) *untrusted,
STACK_OF(X509_CRL) *crls,
STACK_OF(X509) **chain,
const CMS_CTX *cms_ctx)
{
X509_STORE_CTX *ctx;
X509 *signer;
int i, j, r = 0;
ctx = X509_STORE_CTX_new_ex(ossl_cms_ctx_get0_libctx(cms_ctx),
ossl_cms_ctx_get0_propq(cms_ctx));
if (ctx == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_X509_LIB);
goto err;
}
CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
if (!X509_STORE_CTX_init(ctx, store, signer, untrusted)) {
ERR_raise(ERR_LIB_CMS, CMS_R_STORE_INIT_ERROR);
goto err;
}
X509_STORE_CTX_set_default(ctx, "smime_sign");
if (crls != NULL)
X509_STORE_CTX_set0_crls(ctx, crls);
i = X509_verify_cert(ctx);
if (i <= 0) {
j = X509_STORE_CTX_get_error(ctx);
ERR_raise_data(ERR_LIB_CMS, CMS_R_CERTIFICATE_VERIFY_ERROR,
"Verify error: %s", X509_verify_cert_error_string(j));
goto err;
}
r = 1;
/* also send back the trust chain when required */
if (chain != NULL)
*chain = X509_STORE_CTX_get1_chain(ctx);
err:
X509_STORE_CTX_free(ctx);
return r;
}
/* This strongly overlaps with PKCS7_verify() */
int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs,
X509_STORE *store, BIO *dcont, BIO *out, unsigned int flags)
{
CMS_SignerInfo *si;
STACK_OF(CMS_SignerInfo) *sinfos;
STACK_OF(X509) *cms_certs = NULL;
STACK_OF(X509_CRL) *crls = NULL;
STACK_OF(X509) **si_chains = NULL;
X509 *signer;
int i, scount = 0, ret = 0;
BIO *cmsbio = NULL, *tmpin = NULL, *tmpout = NULL;
int cadesVerify = (flags & CMS_CADES) != 0;
const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
if (dcont == NULL && !check_content(cms))
return 0;
if (dcont != NULL && !(flags & CMS_BINARY)) {
const ASN1_OBJECT *coid = CMS_get0_eContentType(cms);
if (OBJ_obj2nid(coid) == NID_id_ct_asciiTextWithCRLF)
flags |= CMS_ASCIICRLF;
}
/* Attempt to find all signer certificates */
sinfos = CMS_get0_SignerInfos(cms);
if (sk_CMS_SignerInfo_num(sinfos) <= 0) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_SIGNERS);
goto err;
}
for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
si = sk_CMS_SignerInfo_value(sinfos, i);
CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
if (signer != NULL)
scount++;
}
if (scount != sk_CMS_SignerInfo_num(sinfos))
scount += CMS_set1_signers_certs(cms, certs, flags);
if (scount != sk_CMS_SignerInfo_num(sinfos)) {
ERR_raise(ERR_LIB_CMS, CMS_R_SIGNER_CERTIFICATE_NOT_FOUND);
goto err;
}
/* Attempt to verify all signers certs */
/* at this point scount == sk_CMS_SignerInfo_num(sinfos) */
if ((flags & CMS_NO_SIGNER_CERT_VERIFY) == 0 || cadesVerify) {
if (cadesVerify) {
/* Certificate trust chain is required to check CAdES signature */
si_chains = OPENSSL_zalloc(scount * sizeof(si_chains[0]));
if (si_chains == NULL)
goto err;
}
cms_certs = CMS_get1_certs(cms);
if (!(flags & CMS_NOCRL))
crls = CMS_get1_crls(cms);
for (i = 0; i < scount; i++) {
si = sk_CMS_SignerInfo_value(sinfos, i);
if (!cms_signerinfo_verify_cert(si, store, cms_certs, crls,
si_chains ? &si_chains[i] : NULL,
ctx))
goto err;
}
}
/* Attempt to verify all SignerInfo signed attribute signatures */
if ((flags & CMS_NO_ATTR_VERIFY) == 0 || cadesVerify) {
for (i = 0; i < scount; i++) {
si = sk_CMS_SignerInfo_value(sinfos, i);
if (CMS_signed_get_attr_count(si) < 0)
continue;
if (CMS_SignerInfo_verify(si) <= 0)
goto err;
if (cadesVerify) {
STACK_OF(X509) *si_chain = si_chains ? si_chains[i] : NULL;
if (ossl_cms_check_signing_certs(si, si_chain) <= 0)
goto err;
}
}
}
/*
* 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 (dcont != NULL && (BIO_method_type(dcont) == BIO_TYPE_MEM)) {
char *ptr;
long len;
len = BIO_get_mem_data(dcont, &ptr);
tmpin = (len == 0) ? dcont : BIO_new_mem_buf(ptr, len);
if (tmpin == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_BIO_LIB);
goto err2;
}
} else {
tmpin = dcont;
}
/*
* If not binary mode and detached generate digests by *writing* through
* the BIO. That makes it possible to canonicalise the input.
*/
if (!(flags & SMIME_BINARY) && dcont) {
/*
* Create output BIO so we can either handle text or to ensure
* included content doesn't override detached content.
*/
tmpout = cms_get_text_bio(out, flags);
if (tmpout == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
goto err;
}
cmsbio = CMS_dataInit(cms, tmpout);
if (cmsbio == NULL)
goto err;
/*
* Don't use SMIME_TEXT for verify: it adds headers and we want to
* remove them.
*/
if (!SMIME_crlf_copy(dcont, cmsbio, flags & ~SMIME_TEXT))
goto err;
if (flags & CMS_TEXT) {
if (!SMIME_text(tmpout, out)) {
ERR_raise(ERR_LIB_CMS, CMS_R_SMIME_TEXT_ERROR);
goto err;
}
}
} else {
cmsbio = CMS_dataInit(cms, tmpin);
if (cmsbio == NULL)
goto err;
if (!cms_copy_content(out, cmsbio, flags))
goto err;
}
if (!(flags & CMS_NO_CONTENT_VERIFY)) {
for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
si = sk_CMS_SignerInfo_value(sinfos, i);
if (CMS_SignerInfo_verify_content(si, cmsbio) <= 0) {
ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_VERIFY_ERROR);
goto err;
}
}
}
ret = 1;
err:
if (!(flags & SMIME_BINARY) && dcont) {
do_free_upto(cmsbio, tmpout);
if (tmpin != dcont)
BIO_free(tmpin);
} else {
if (dcont && (tmpin == dcont))
do_free_upto(cmsbio, dcont);
else
BIO_free_all(cmsbio);
}
if (out != tmpout)
BIO_free_all(tmpout);
err2:
if (si_chains != NULL) {
for (i = 0; i < scount; ++i)
OSSL_STACK_OF_X509_free(si_chains[i]);
OPENSSL_free(si_chains);
}
OSSL_STACK_OF_X509_free(cms_certs);
sk_X509_CRL_pop_free(crls, X509_CRL_free);
return ret;
}
int CMS_verify_receipt(CMS_ContentInfo *rcms, CMS_ContentInfo *ocms,
STACK_OF(X509) *certs,
X509_STORE *store, unsigned int flags)
{
int r;
flags &= ~(CMS_DETACHED | CMS_TEXT);
r = CMS_verify(rcms, certs, store, NULL, NULL, flags);
if (r <= 0)
return r;
return ossl_cms_Receipt_verify(rcms, ocms);
}
CMS_ContentInfo *CMS_sign_ex(X509 *signcert, EVP_PKEY *pkey,
STACK_OF(X509) *certs, BIO *data,
unsigned int flags, OSSL_LIB_CTX *libctx,
const char *propq)
{
CMS_ContentInfo *cms;
int i;
cms = CMS_ContentInfo_new_ex(libctx, propq);
if (cms == NULL || !CMS_SignedData_init(cms)) {
ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
goto err;
}
if (flags & CMS_ASCIICRLF
&& !CMS_set1_eContentType(cms,
OBJ_nid2obj(NID_id_ct_asciiTextWithCRLF))) {
ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
goto err;
}
if (pkey != NULL && !CMS_add1_signer(cms, signcert, pkey, NULL, flags)) {
ERR_raise(ERR_LIB_CMS, CMS_R_ADD_SIGNER_ERROR);
goto err;
}
for (i = 0; i < sk_X509_num(certs); i++) {
X509 *x = sk_X509_value(certs, i);
if (!CMS_add1_cert(cms, x)) {
ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
goto err;
}
}
if (!(flags & CMS_DETACHED))
CMS_set_detached(cms, 0);
if ((flags & (CMS_STREAM | CMS_PARTIAL))
|| CMS_final(cms, data, NULL, flags))
return cms;
else
goto err;
err:
CMS_ContentInfo_free(cms);
return NULL;
}
CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
BIO *data, unsigned int flags)
{
return CMS_sign_ex(signcert, pkey, certs, data, flags, NULL, NULL);
}
CMS_ContentInfo *CMS_sign_receipt(CMS_SignerInfo *si,
X509 *signcert, EVP_PKEY *pkey,
STACK_OF(X509) *certs, unsigned int flags)
{
CMS_SignerInfo *rct_si;
CMS_ContentInfo *cms = NULL;
ASN1_OCTET_STRING **pos, *os = NULL;
BIO *rct_cont = NULL;
int r = 0;
const CMS_CTX *ctx = si->cms_ctx;
flags &= ~(CMS_STREAM | CMS_TEXT);
/* Not really detached but avoids content being allocated */
flags |= CMS_PARTIAL | CMS_BINARY | CMS_DETACHED;
if (pkey == NULL || signcert == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_KEY_OR_CERT);
return NULL;
}
/* Initialize signed data */
cms = CMS_sign_ex(NULL, NULL, certs, NULL, flags,
ossl_cms_ctx_get0_libctx(ctx),
ossl_cms_ctx_get0_propq(ctx));
if (cms == NULL)
goto err;
/* Set inner content type to signed receipt */
if (!CMS_set1_eContentType(cms, OBJ_nid2obj(NID_id_smime_ct_receipt)))
goto err;
rct_si = CMS_add1_signer(cms, signcert, pkey, NULL, flags);
if (!rct_si) {
ERR_raise(ERR_LIB_CMS, CMS_R_ADD_SIGNER_ERROR);
goto err;
}
os = ossl_cms_encode_Receipt(si);
if (os == NULL)
goto err;
/* Set content to digest */
rct_cont = BIO_new_mem_buf(os->data, os->length);
if (rct_cont == NULL)
goto err;
/* Add msgSigDigest attribute */
if (!ossl_cms_msgSigDigest_add1(rct_si, si))
goto err;
/* Finalize structure */
if (!CMS_final(cms, rct_cont, NULL, flags))
goto err;
/* Set embedded content */
pos = CMS_get0_content(cms);
if (pos == NULL)
goto err;
*pos = os;
r = 1;
err:
BIO_free(rct_cont);
if (r)
return cms;
CMS_ContentInfo_free(cms);
ASN1_OCTET_STRING_free(os);
return NULL;
}
CMS_ContentInfo *CMS_encrypt_ex(STACK_OF(X509) *certs, BIO *data,
const EVP_CIPHER *cipher, unsigned int flags,
OSSL_LIB_CTX *libctx, const char *propq)
{
CMS_ContentInfo *cms;
int i;
X509 *recip;
cms = (EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)
? CMS_AuthEnvelopedData_create_ex(cipher, libctx, propq)
: CMS_EnvelopedData_create_ex(cipher, libctx, propq);
if (cms == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
goto err;
}
for (i = 0; i < sk_X509_num(certs); i++) {
recip = sk_X509_value(certs, i);
if (!CMS_add1_recipient_cert(cms, recip, flags)) {
ERR_raise(ERR_LIB_CMS, CMS_R_RECIPIENT_ERROR);
goto err;
}
}
if (!(flags & CMS_DETACHED))
CMS_set_detached(cms, 0);
if ((flags & (CMS_STREAM | CMS_PARTIAL))
|| CMS_final(cms, data, NULL, flags))
return cms;
else
ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
err:
CMS_ContentInfo_free(cms);
return NULL;
}
CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *data,
const EVP_CIPHER *cipher, unsigned int flags)
{
return CMS_encrypt_ex(certs, data, cipher, flags, NULL, NULL);
}
static int cms_kari_set1_pkey_and_peer(CMS_ContentInfo *cms,
CMS_RecipientInfo *ri,
EVP_PKEY *pk, X509 *cert, X509 *peer)
{
int i;
STACK_OF(CMS_RecipientEncryptedKey) *reks;
CMS_RecipientEncryptedKey *rek;
reks = CMS_RecipientInfo_kari_get0_reks(ri);
for (i = 0; i < sk_CMS_RecipientEncryptedKey_num(reks); i++) {
int rv;
rek = sk_CMS_RecipientEncryptedKey_value(reks, i);
if (cert != NULL && CMS_RecipientEncryptedKey_cert_cmp(rek, cert))
continue;
CMS_RecipientInfo_kari_set0_pkey_and_peer(ri, pk, peer);
rv = CMS_RecipientInfo_kari_decrypt(cms, ri, rek);
CMS_RecipientInfo_kari_set0_pkey(ri, NULL);
if (rv > 0)
return 1;
return cert == NULL ? 0 : -1;
}
return 0;
}
int CMS_decrypt_set1_pkey(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert)
{
return CMS_decrypt_set1_pkey_and_peer(cms, pk, cert, NULL);
}
int CMS_decrypt_set1_pkey_and_peer(CMS_ContentInfo *cms, EVP_PKEY *pk,
X509 *cert, X509 *peer)
{
STACK_OF(CMS_RecipientInfo) *ris = CMS_get0_RecipientInfos(cms);
CMS_RecipientInfo *ri;
int i, r, cms_pkey_ri_type;
int debug = 0, match_ri = 0;
CMS_EncryptedContentInfo *ec = ossl_cms_get0_env_enc_content(cms);
/* Prevent mem leak on earlier CMS_decrypt_set1_{pkey_and_peer,password} */
if (ec != NULL) {
OPENSSL_clear_free(ec->key, ec->keylen);
ec->key = NULL;
ec->keylen = 0;
}
if (ris != NULL && ec != NULL)
debug = ec->debug;
cms_pkey_ri_type = ossl_cms_pkey_get_ri_type(pk);
if (cms_pkey_ri_type == CMS_RECIPINFO_NONE) {
ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
return 0;
}
for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
int ri_type;
ri = sk_CMS_RecipientInfo_value(ris, i);
ri_type = CMS_RecipientInfo_type(ri);
if (!ossl_cms_pkey_is_ri_type_supported(pk, ri_type))
continue;
match_ri = 1;
if (ri_type == CMS_RECIPINFO_AGREE) {
r = cms_kari_set1_pkey_and_peer(cms, ri, pk, cert, peer);
if (r > 0)
return 1;
if (r < 0)
return 0;
}
/* If we have a cert, try matching RecipientInfo, else try them all */
else if (cert == NULL || !CMS_RecipientInfo_ktri_cert_cmp(ri, cert)) {
EVP_PKEY_up_ref(pk);
CMS_RecipientInfo_set0_pkey(ri, pk);
r = CMS_RecipientInfo_decrypt(cms, ri);
CMS_RecipientInfo_set0_pkey(ri, NULL);
if (cert != NULL) {
/*
* If not debugging clear any error and return success to
* avoid leaking of information useful to MMA
*/
if (!debug) {
ERR_clear_error();
return 1;
}
if (r > 0)
return 1;
ERR_raise(ERR_LIB_CMS, CMS_R_DECRYPT_ERROR);
return 0;
}
/*
* If no cert and not debugging don't leave loop after first
* successful decrypt. Always attempt to decrypt all recipients
* to avoid leaking timing of a successful decrypt.
*/
else if (r > 0 && (debug || cms_pkey_ri_type != CMS_RECIPINFO_TRANS))
return 1;
}
}
/* If no cert, key transport and not debugging always return success */
if (cert == NULL
&& cms_pkey_ri_type == CMS_RECIPINFO_TRANS
&& match_ri
&& !debug) {
ERR_clear_error();
return 1;
}
if (!match_ri)
ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
return 0;
}
int CMS_decrypt_set1_key(CMS_ContentInfo *cms,
unsigned char *key, size_t keylen,
const unsigned char *id, size_t idlen)
{
STACK_OF(CMS_RecipientInfo) *ris;
CMS_RecipientInfo *ri;
int i, r, match_ri = 0;
ris = CMS_get0_RecipientInfos(cms);
for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
ri = sk_CMS_RecipientInfo_value(ris, i);
if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_KEK)
continue;
/* If we have an id, try matching RecipientInfo, else try them all */
if (id == NULL
|| (CMS_RecipientInfo_kekri_id_cmp(ri, id, idlen) == 0)) {
match_ri = 1;
CMS_RecipientInfo_set0_key(ri, key, keylen);
r = CMS_RecipientInfo_decrypt(cms, ri);
CMS_RecipientInfo_set0_key(ri, NULL, 0);
if (r > 0)
return 1;
if (id != NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_DECRYPT_ERROR);
return 0;
}
ERR_clear_error();
}
}
if (!match_ri)
ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
return 0;
}
int CMS_decrypt_set1_password(CMS_ContentInfo *cms,
unsigned char *pass, ossl_ssize_t passlen)
{
STACK_OF(CMS_RecipientInfo) *ris = CMS_get0_RecipientInfos(cms);
CMS_RecipientInfo *ri;
int i, r, match_ri = 0;
CMS_EncryptedContentInfo *ec = ossl_cms_get0_env_enc_content(cms);
/* Prevent mem leak on earlier CMS_decrypt_set1_{pkey_and_peer,password} */
if (ec != NULL) {
OPENSSL_clear_free(ec->key, ec->keylen);
ec->key = NULL;
ec->keylen = 0;
}
for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
ri = sk_CMS_RecipientInfo_value(ris, i);
if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_PASS)
continue;
/* Must try each PasswordRecipientInfo */
match_ri = 1;
CMS_RecipientInfo_set0_password(ri, pass, passlen);
r = CMS_RecipientInfo_decrypt(cms, ri);
CMS_RecipientInfo_set0_password(ri, NULL, 0);
if (r > 0)
return 1;
}
if (!match_ri)
ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
return 0;
}
int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert,
BIO *dcont, BIO *out, unsigned int flags)
{
int r;
BIO *cont;
CMS_EncryptedContentInfo *ec;
int nid = OBJ_obj2nid(CMS_get0_type(cms));
if (nid != NID_pkcs7_enveloped
&& nid != NID_id_smime_ct_authEnvelopedData) {
ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_ENVELOPED_DATA);
return 0;
}
if (dcont == NULL && !check_content(cms))
return 0;
ec = ossl_cms_get0_env_enc_content(cms);
ec->debug = (flags & CMS_DEBUG_DECRYPT) != 0;
ec->havenocert = cert == NULL;
if (pk == NULL && cert == NULL && dcont == NULL && out == NULL)
return 1;
if (pk != NULL && !CMS_decrypt_set1_pkey(cms, pk, cert))
return 0;
cont = CMS_dataInit(cms, dcont);
if (cont == NULL)
return 0;
r = cms_copy_content(out, cont, flags);
do_free_upto(cont, dcont);
return r;
}
int CMS_final(CMS_ContentInfo *cms, BIO *data, BIO *dcont, unsigned int flags)
{
BIO *cmsbio;
int ret = 0;
if ((cmsbio = CMS_dataInit(cms, dcont)) == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_CMS_LIB);
return 0;
}
if (!SMIME_crlf_copy(data, cmsbio, flags)) {
goto err;
}
(void)BIO_flush(cmsbio);
if (!CMS_dataFinal(cms, cmsbio)) {
ERR_raise(ERR_LIB_CMS, CMS_R_CMS_DATAFINAL_ERROR);
goto err;
}
ret = 1;
err:
do_free_upto(cmsbio, dcont);
return ret;
}
int CMS_final_digest(CMS_ContentInfo *cms,
const unsigned char *md, unsigned int mdlen,
BIO *dcont, unsigned int flags)
{
BIO *cmsbio;
int ret = 0;
if ((cmsbio = CMS_dataInit(cms, dcont)) == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_CMS_LIB);
return 0;
}
(void)BIO_flush(cmsbio);
if (!ossl_cms_DataFinal(cms, cmsbio, md, mdlen)) {
ERR_raise(ERR_LIB_CMS, CMS_R_CMS_DATAFINAL_ERROR);
goto err;
}
ret = 1;
err:
do_free_upto(cmsbio, dcont);
return ret;
}
#ifndef OPENSSL_NO_ZLIB
int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
unsigned int flags)
{
BIO *cont;
int r;
if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData) {
ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_COMPRESSED_DATA);
return 0;
}
if (dcont == NULL && !check_content(cms))
return 0;
cont = CMS_dataInit(cms, dcont);
if (cont == NULL)
return 0;
r = cms_copy_content(out, cont, flags);
do_free_upto(cont, dcont);
return r;
}
CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
{
CMS_ContentInfo *cms;
if (comp_nid <= 0)
comp_nid = NID_zlib_compression;
cms = ossl_cms_CompressedData_create(comp_nid, NULL, NULL);
if (cms == NULL)
return NULL;
if (!(flags & CMS_DETACHED))
CMS_set_detached(cms, 0);
if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
return cms;
CMS_ContentInfo_free(cms);
return NULL;
}
#else
int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
unsigned int flags)
{
ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
return 0;
}
CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
{
ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
return NULL;
}
#endif
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