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Copy pathpk7_doit.c
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pk7_doit.c
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/*
* Copyright 1995-2024 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 <stdio.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include "internal/cryptlib.h"
#include "internal/sizes.h"
#include "crypto/evp.h"
#include "pk7_local.h"
static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
void *value);
static ASN1_TYPE *get_attribute(const STACK_OF(X509_ATTRIBUTE) *sk, int nid);
int PKCS7_type_is_other(PKCS7 *p7)
{
int isOther = 1;
int nid = OBJ_obj2nid(p7->type);
switch (nid) {
case NID_pkcs7_data:
case NID_pkcs7_signed:
case NID_pkcs7_enveloped:
case NID_pkcs7_signedAndEnveloped:
case NID_pkcs7_digest:
case NID_pkcs7_encrypted:
isOther = 0;
break;
default:
isOther = 1;
}
return isOther;
}
ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
{
if (PKCS7_type_is_data(p7))
return p7->d.data;
if (PKCS7_type_is_other(p7) && p7->d.other
&& (p7->d.other->type == V_ASN1_OCTET_STRING))
return p7->d.other->value.octet_string;
return NULL;
}
static ASN1_OCTET_STRING *pkcs7_get1_data(PKCS7 *p7)
{
ASN1_OCTET_STRING *os = PKCS7_get_octet_string(p7);
if (os != NULL) {
/* Edge case for MIME content, see RFC 5652 section-5.2.1 */
ASN1_OCTET_STRING *osdup = ASN1_OCTET_STRING_dup(os);
if (osdup != NULL && (os->flags & ASN1_STRING_FLAG_NDEF))
/* ASN1_STRING_FLAG_NDEF flag is currently used by openssl-smime */
ASN1_STRING_set0(osdup, NULL, 0);
return osdup;
}
/* General case for PKCS#7 content, see RFC 2315 section-7 */
if (PKCS7_type_is_other(p7) && (p7->d.other != NULL)
&& (p7->d.other->type == V_ASN1_SEQUENCE)
&& (p7->d.other->value.sequence != NULL)
&& (p7->d.other->value.sequence->length > 0)) {
const unsigned char *data = p7->d.other->value.sequence->data;
long len;
int inf, tag, class;
os = ASN1_OCTET_STRING_new();
if (os == NULL)
return NULL;
inf = ASN1_get_object(&data, &len, &tag, &class,
p7->d.other->value.sequence->length);
if (inf != V_ASN1_CONSTRUCTED || tag != V_ASN1_SEQUENCE
|| !ASN1_OCTET_STRING_set(os, data, len)) {
ASN1_OCTET_STRING_free(os);
os = NULL;
}
}
return os;
}
static int pkcs7_bio_add_digest(BIO **pbio, X509_ALGOR *alg,
const PKCS7_CTX *ctx)
{
BIO *btmp;
char name[OSSL_MAX_NAME_SIZE];
EVP_MD *fetched = NULL;
const EVP_MD *md;
if ((btmp = BIO_new(BIO_f_md())) == NULL) {
ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
goto err;
}
OBJ_obj2txt(name, sizeof(name), alg->algorithm, 0);
(void)ERR_set_mark();
fetched = EVP_MD_fetch(ossl_pkcs7_ctx_get0_libctx(ctx), name,
ossl_pkcs7_ctx_get0_propq(ctx));
if (fetched != NULL)
md = fetched;
else
md = EVP_get_digestbyname(name);
if (md == NULL) {
(void)ERR_clear_last_mark();
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNKNOWN_DIGEST_TYPE);
goto err;
}
(void)ERR_pop_to_mark();
if (BIO_set_md(btmp, md) <= 0) {
ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
EVP_MD_free(fetched);
goto err;
}
EVP_MD_free(fetched);
if (*pbio == NULL)
*pbio = btmp;
else if (!BIO_push(*pbio, btmp)) {
ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
goto err;
}
btmp = NULL;
return 1;
err:
BIO_free(btmp);
return 0;
}
static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
unsigned char *key, int keylen)
{
EVP_PKEY_CTX *pctx = NULL;
EVP_PKEY *pkey = NULL;
unsigned char *ek = NULL;
int ret = 0;
size_t eklen;
const PKCS7_CTX *ctx = ri->ctx;
pkey = X509_get0_pubkey(ri->cert);
if (pkey == NULL)
return 0;
pctx = EVP_PKEY_CTX_new_from_pkey(ossl_pkcs7_ctx_get0_libctx(ctx), pkey,
ossl_pkcs7_ctx_get0_propq(ctx));
if (pctx == NULL)
return 0;
if (EVP_PKEY_encrypt_init(pctx) <= 0)
goto err;
if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
goto err;
ek = OPENSSL_malloc(eklen);
if (ek == NULL)
goto err;
if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
goto err;
ASN1_STRING_set0(ri->enc_key, ek, eklen);
ek = NULL;
ret = 1;
err:
EVP_PKEY_CTX_free(pctx);
OPENSSL_free(ek);
return ret;
}
static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey,
size_t fixlen)
{
EVP_PKEY_CTX *pctx = NULL;
unsigned char *ek = NULL;
size_t eklen;
int ret = -1;
const PKCS7_CTX *ctx = ri->ctx;
pctx = EVP_PKEY_CTX_new_from_pkey(ossl_pkcs7_ctx_get0_libctx(ctx), pkey,
ossl_pkcs7_ctx_get0_propq(ctx));
if (pctx == NULL)
return -1;
if (EVP_PKEY_decrypt_init(pctx) <= 0)
goto err;
if (EVP_PKEY_is_a(pkey, "RSA"))
/* upper layer pkcs7 code incorrectly assumes that a successful RSA
* decryption means that the key matches ciphertext (which never
* was the case, implicit rejection or not), so to make it work
* disable implicit rejection for RSA keys */
EVP_PKEY_CTX_ctrl_str(pctx, "rsa_pkcs1_implicit_rejection", "0");
ret = evp_pkey_decrypt_alloc(pctx, &ek, &eklen, fixlen,
ri->enc_key->data, ri->enc_key->length);
if (ret <= 0)
goto err;
ret = 1;
OPENSSL_clear_free(*pek, *peklen);
*pek = ek;
*peklen = eklen;
err:
EVP_PKEY_CTX_free(pctx);
if (!ret)
OPENSSL_free(ek);
return ret;
}
BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
{
int i;
BIO *out = NULL, *btmp = NULL;
X509_ALGOR *xa = NULL;
EVP_CIPHER *fetched_cipher = NULL;
const EVP_CIPHER *cipher;
const EVP_CIPHER *evp_cipher = NULL;
STACK_OF(X509_ALGOR) *md_sk = NULL;
STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
X509_ALGOR *xalg = NULL;
PKCS7_RECIP_INFO *ri = NULL;
ASN1_OCTET_STRING *os = NULL;
const PKCS7_CTX *p7_ctx;
OSSL_LIB_CTX *libctx;
const char *propq;
if (p7 == NULL) {
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
return NULL;
}
p7_ctx = ossl_pkcs7_get0_ctx(p7);
libctx = ossl_pkcs7_ctx_get0_libctx(p7_ctx);
propq = ossl_pkcs7_ctx_get0_propq(p7_ctx);
/*
* The content field in the PKCS7 ContentInfo is optional, but that really
* only applies to inner content (precisely, detached signatures).
*
* When reading content, missing outer content is therefore treated as an
* error.
*
* When creating content, PKCS7_content_new() must be called before
* calling this method, so a NULL p7->d is always an error.
*/
if (p7->d.ptr == NULL) {
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
return NULL;
}
i = OBJ_obj2nid(p7->type);
p7->state = PKCS7_S_HEADER;
switch (i) {
case NID_pkcs7_signed:
md_sk = p7->d.sign->md_algs;
os = pkcs7_get1_data(p7->d.sign->contents);
break;
case NID_pkcs7_signedAndEnveloped:
rsk = p7->d.signed_and_enveloped->recipientinfo;
md_sk = p7->d.signed_and_enveloped->md_algs;
xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
if (evp_cipher == NULL) {
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_CIPHER_NOT_INITIALIZED);
goto err;
}
break;
case NID_pkcs7_enveloped:
rsk = p7->d.enveloped->recipientinfo;
xalg = p7->d.enveloped->enc_data->algorithm;
evp_cipher = p7->d.enveloped->enc_data->cipher;
if (evp_cipher == NULL) {
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_CIPHER_NOT_INITIALIZED);
goto err;
}
break;
case NID_pkcs7_digest:
xa = p7->d.digest->md;
os = pkcs7_get1_data(p7->d.digest->contents);
break;
case NID_pkcs7_data:
break;
default:
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
goto err;
}
for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
if (!pkcs7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i), p7_ctx))
goto err;
if (xa && !pkcs7_bio_add_digest(&out, xa, p7_ctx))
goto err;
if (evp_cipher != NULL) {
unsigned char key[EVP_MAX_KEY_LENGTH];
unsigned char iv[EVP_MAX_IV_LENGTH];
int keylen, ivlen;
EVP_CIPHER_CTX *ctx;
if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
goto err;
}
BIO_get_cipher_ctx(btmp, &ctx);
keylen = EVP_CIPHER_get_key_length(evp_cipher);
ivlen = EVP_CIPHER_get_iv_length(evp_cipher);
xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_get_type(evp_cipher));
if (ivlen > 0)
if (RAND_bytes_ex(libctx, iv, ivlen, 0) <= 0)
goto err;
(void)ERR_set_mark();
fetched_cipher = EVP_CIPHER_fetch(libctx,
EVP_CIPHER_get0_name(evp_cipher),
propq);
(void)ERR_pop_to_mark();
if (fetched_cipher != NULL)
cipher = fetched_cipher;
else
cipher = evp_cipher;
if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, 1) <= 0)
goto err;
EVP_CIPHER_free(fetched_cipher);
fetched_cipher = NULL;
if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
goto err;
if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
goto err;
if (ivlen > 0) {
if (xalg->parameter == NULL) {
xalg->parameter = ASN1_TYPE_new();
if (xalg->parameter == NULL)
goto err;
}
if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) <= 0)
goto err;
}
/* Lets do the pub key stuff :-) */
for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
goto err;
}
OPENSSL_cleanse(key, keylen);
if (out == NULL)
out = btmp;
else
BIO_push(out, btmp);
btmp = NULL;
}
if (bio == NULL) {
if (PKCS7_is_detached(p7)) {
bio = BIO_new(BIO_s_null());
} else if (os != NULL && os->length > 0) {
/*
* bio needs a copy of os->data instead of a pointer because
* the data will be used after os has been freed
*/
bio = BIO_new(BIO_s_mem());
if (bio != NULL) {
BIO_set_mem_eof_return(bio, 0);
if (BIO_write(bio, os->data, os->length) != os->length) {
BIO_free_all(bio);
bio = NULL;
}
}
} else {
bio = BIO_new(BIO_s_mem());
if (bio == NULL)
goto err;
BIO_set_mem_eof_return(bio, 0);
}
if (bio == NULL)
goto err;
}
if (out)
BIO_push(out, bio);
else
out = bio;
ASN1_OCTET_STRING_free(os);
return out;
err:
ASN1_OCTET_STRING_free(os);
EVP_CIPHER_free(fetched_cipher);
BIO_free_all(out);
BIO_free_all(btmp);
return NULL;
}
static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
{
int ret;
ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
X509_get_issuer_name(pcert));
if (ret)
return ret;
return ASN1_INTEGER_cmp(X509_get0_serialNumber(pcert),
ri->issuer_and_serial->serial);
}
/* int */
BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
{
int i, len;
BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
X509_ALGOR *xa;
ASN1_OCTET_STRING *data_body = NULL;
EVP_MD *evp_md = NULL;
const EVP_MD *md;
EVP_CIPHER *evp_cipher = NULL;
const EVP_CIPHER *cipher = NULL;
EVP_CIPHER_CTX *evp_ctx = NULL;
X509_ALGOR *enc_alg = NULL;
STACK_OF(X509_ALGOR) *md_sk = NULL;
STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
PKCS7_RECIP_INFO *ri = NULL;
unsigned char *ek = NULL, *tkey = NULL;
int eklen = 0, tkeylen = 0;
char name[OSSL_MAX_NAME_SIZE];
const PKCS7_CTX *p7_ctx;
OSSL_LIB_CTX *libctx;
const char *propq;
if (p7 == NULL) {
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
return NULL;
}
p7_ctx = ossl_pkcs7_get0_ctx(p7);
libctx = ossl_pkcs7_ctx_get0_libctx(p7_ctx);
propq = ossl_pkcs7_ctx_get0_propq(p7_ctx);
if (p7->d.ptr == NULL) {
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
return NULL;
}
i = OBJ_obj2nid(p7->type);
p7->state = PKCS7_S_HEADER;
switch (i) {
case NID_pkcs7_signed:
/*
* p7->d.sign->contents is a PKCS7 structure consisting of a contentType
* field and optional content.
* data_body is NULL if that structure has no (=detached) content
* or if the contentType is wrong (i.e., not "data").
*/
data_body = PKCS7_get_octet_string(p7->d.sign->contents);
if (!PKCS7_is_detached(p7) && data_body == NULL) {
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_SIGNED_DATA_TYPE);
goto err;
}
md_sk = p7->d.sign->md_algs;
break;
case NID_pkcs7_signedAndEnveloped:
rsk = p7->d.signed_and_enveloped->recipientinfo;
md_sk = p7->d.signed_and_enveloped->md_algs;
/* data_body is NULL if the optional EncryptedContent is missing. */
data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
OBJ_obj2txt(name, sizeof(name), enc_alg->algorithm, 0);
(void)ERR_set_mark();
evp_cipher = EVP_CIPHER_fetch(libctx, name, propq);
if (evp_cipher != NULL)
cipher = evp_cipher;
else
cipher = EVP_get_cipherbyname(name);
if (cipher == NULL) {
(void)ERR_clear_last_mark();
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
goto err;
}
(void)ERR_pop_to_mark();
break;
case NID_pkcs7_enveloped:
rsk = p7->d.enveloped->recipientinfo;
enc_alg = p7->d.enveloped->enc_data->algorithm;
/* data_body is NULL if the optional EncryptedContent is missing. */
data_body = p7->d.enveloped->enc_data->enc_data;
OBJ_obj2txt(name, sizeof(name), enc_alg->algorithm, 0);
(void)ERR_set_mark();
evp_cipher = EVP_CIPHER_fetch(libctx, name, propq);
if (evp_cipher != NULL)
cipher = evp_cipher;
else
cipher = EVP_get_cipherbyname(name);
if (cipher == NULL) {
(void)ERR_clear_last_mark();
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
goto err;
}
(void)ERR_pop_to_mark();
break;
default:
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
goto err;
}
/* Detached content must be supplied via in_bio instead. */
if (data_body == NULL && in_bio == NULL) {
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
goto err;
}
/* We will be checking the signature */
if (md_sk != NULL) {
for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
xa = sk_X509_ALGOR_value(md_sk, i);
if ((btmp = BIO_new(BIO_f_md())) == NULL) {
ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
goto err;
}
OBJ_obj2txt(name, sizeof(name), xa->algorithm, 0);
(void)ERR_set_mark();
evp_md = EVP_MD_fetch(libctx, name, propq);
if (evp_md != NULL)
md = evp_md;
else
md = EVP_get_digestbyname(name);
if (md == NULL) {
(void)ERR_clear_last_mark();
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNKNOWN_DIGEST_TYPE);
goto err;
}
(void)ERR_pop_to_mark();
if (BIO_set_md(btmp, md) <= 0) {
EVP_MD_free(evp_md);
ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
goto err;
}
EVP_MD_free(evp_md);
if (out == NULL)
out = btmp;
else
BIO_push(out, btmp);
btmp = NULL;
}
}
if (cipher != NULL) {
if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
goto err;
}
/*
* It was encrypted, we need to decrypt the secret key with the
* private key
*/
/*
* Find the recipientInfo which matches the passed certificate (if
* any)
*/
if (pcert) {
for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
if (!pkcs7_cmp_ri(ri, pcert))
break;
ri = NULL;
}
if (ri == NULL) {
ERR_raise(ERR_LIB_PKCS7,
PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
goto err;
}
}
/* If we haven't got a certificate try each ri in turn */
if (pcert == NULL) {
/*
* Always attempt to decrypt all rinfo even after success as a
* defence against MMA timing attacks.
*/
for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
ri->ctx = p7_ctx;
if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey,
EVP_CIPHER_get_key_length(cipher)) < 0)
goto err;
ERR_clear_error();
}
} else {
ri->ctx = p7_ctx;
/* Only exit on fatal errors, not decrypt failure */
if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey, 0) < 0)
goto err;
ERR_clear_error();
}
evp_ctx = NULL;
BIO_get_cipher_ctx(etmp, &evp_ctx);
if (EVP_CipherInit_ex(evp_ctx, cipher, NULL, NULL, NULL, 0) <= 0)
goto err;
if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) <= 0)
goto err;
/* Generate random key as MMA defence */
len = EVP_CIPHER_CTX_get_key_length(evp_ctx);
if (len <= 0)
goto err;
tkeylen = (size_t)len;
tkey = OPENSSL_malloc(tkeylen);
if (tkey == NULL)
goto err;
if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
goto err;
if (ek == NULL) {
ek = tkey;
eklen = tkeylen;
tkey = NULL;
}
if (eklen != EVP_CIPHER_CTX_get_key_length(evp_ctx)) {
/*
* Some S/MIME clients don't use the same key and effective key
* length. The key length is determined by the size of the
* decrypted RSA key.
*/
if (EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen) <= 0) {
/* Use random key as MMA defence */
OPENSSL_clear_free(ek, eklen);
ek = tkey;
eklen = tkeylen;
tkey = NULL;
}
}
/* Clear errors so we don't leak information useful in MMA */
ERR_clear_error();
if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
goto err;
OPENSSL_clear_free(ek, eklen);
ek = NULL;
OPENSSL_clear_free(tkey, tkeylen);
tkey = NULL;
if (out == NULL)
out = etmp;
else
BIO_push(out, etmp);
etmp = NULL;
}
if (in_bio != NULL) {
bio = in_bio;
} else {
if (data_body->length > 0)
bio = BIO_new_mem_buf(data_body->data, data_body->length);
else {
bio = BIO_new(BIO_s_mem());
if (bio == NULL)
goto err;
BIO_set_mem_eof_return(bio, 0);
}
if (bio == NULL)
goto err;
}
BIO_push(out, bio);
bio = NULL;
EVP_CIPHER_free(evp_cipher);
return out;
err:
EVP_CIPHER_free(evp_cipher);
OPENSSL_clear_free(ek, eklen);
OPENSSL_clear_free(tkey, tkeylen);
BIO_free_all(out);
BIO_free_all(btmp);
BIO_free_all(etmp);
BIO_free_all(bio);
return NULL;
}
static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
{
for (;;) {
bio = BIO_find_type(bio, BIO_TYPE_MD);
if (bio == NULL) {
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
return NULL;
}
BIO_get_md_ctx(bio, pmd);
if (*pmd == NULL) {
ERR_raise(ERR_LIB_PKCS7, ERR_R_INTERNAL_ERROR);
return NULL;
}
if (EVP_MD_CTX_get_type(*pmd) == nid)
return bio;
bio = BIO_next(bio);
}
return NULL;
}
static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
{
unsigned char md_data[EVP_MAX_MD_SIZE];
unsigned int md_len;
/* Add signing time if not already present */
if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
ERR_raise(ERR_LIB_PKCS7, ERR_R_PKCS7_LIB);
return 0;
}
}
/* Add digest */
if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
return 0;
}
if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
ERR_raise(ERR_LIB_PKCS7, ERR_R_PKCS7_LIB);
return 0;
}
/* Now sign the attributes */
if (!PKCS7_SIGNER_INFO_sign(si))
return 0;
return 1;
}
int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
{
int ret = 0;
int i, j;
BIO *btmp;
PKCS7_SIGNER_INFO *si;
EVP_MD_CTX *mdc, *ctx_tmp;
STACK_OF(X509_ATTRIBUTE) *sk;
STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
ASN1_OCTET_STRING *os = NULL;
const PKCS7_CTX *p7_ctx;
if (p7 == NULL) {
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
return 0;
}
p7_ctx = ossl_pkcs7_get0_ctx(p7);
if (p7->d.ptr == NULL) {
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
return 0;
}
ctx_tmp = EVP_MD_CTX_new();
if (ctx_tmp == NULL) {
ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
return 0;
}
i = OBJ_obj2nid(p7->type);
p7->state = PKCS7_S_HEADER;
switch (i) {
case NID_pkcs7_data:
os = p7->d.data;
break;
case NID_pkcs7_signedAndEnveloped:
/* XXXXXXXXXXXXXXXX */
si_sk = p7->d.signed_and_enveloped->signer_info;
os = p7->d.signed_and_enveloped->enc_data->enc_data;
if (os == NULL) {
os = ASN1_OCTET_STRING_new();
if (os == NULL) {
ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);
goto err;
}
p7->d.signed_and_enveloped->enc_data->enc_data = os;
}
break;
case NID_pkcs7_enveloped:
/* XXXXXXXXXXXXXXXX */
os = p7->d.enveloped->enc_data->enc_data;
if (os == NULL) {
os = ASN1_OCTET_STRING_new();
if (os == NULL) {
ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);
goto err;
}
p7->d.enveloped->enc_data->enc_data = os;
}
break;
case NID_pkcs7_signed:
si_sk = p7->d.sign->signer_info;
os = PKCS7_get_octet_string(p7->d.sign->contents);
/* If detached data then the content is excluded */
if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
ASN1_OCTET_STRING_free(os);
os = NULL;
p7->d.sign->contents->d.data = NULL;
}
break;
case NID_pkcs7_digest:
os = PKCS7_get_octet_string(p7->d.digest->contents);
/* If detached data then the content is excluded */
if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
ASN1_OCTET_STRING_free(os);
os = NULL;
p7->d.digest->contents->d.data = NULL;
}
break;
default:
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
goto err;
}
if (si_sk != NULL) {
for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
if (si->pkey == NULL)
continue;
j = OBJ_obj2nid(si->digest_alg->algorithm);
btmp = bio;
btmp = PKCS7_find_digest(&mdc, btmp, j);
if (btmp == NULL)
goto err;
/*
* We now have the EVP_MD_CTX, lets do the signing.
*/
if (!EVP_MD_CTX_copy_ex(ctx_tmp, mdc))
goto err;
sk = si->auth_attr;
/*
* If there are attributes, we add the digest attribute and only
* sign the attributes
*/
if (sk_X509_ATTRIBUTE_num(sk) > 0) {
if (!do_pkcs7_signed_attrib(si, ctx_tmp))
goto err;
} else {
unsigned char *abuf = NULL;
unsigned int abuflen = EVP_PKEY_get_size(si->pkey);
if (abuflen == 0 || (abuf = OPENSSL_malloc(abuflen)) == NULL)
goto err;
if (!EVP_SignFinal_ex(ctx_tmp, abuf, &abuflen, si->pkey,
ossl_pkcs7_ctx_get0_libctx(p7_ctx),
ossl_pkcs7_ctx_get0_propq(p7_ctx))) {
OPENSSL_free(abuf);
ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
goto err;
}
ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
}
}
} else if (i == NID_pkcs7_digest) {
unsigned char md_data[EVP_MAX_MD_SIZE];
unsigned int md_len;
if (!PKCS7_find_digest(&mdc, bio,
OBJ_obj2nid(p7->d.digest->md->algorithm)))
goto err;
if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
goto err;
if (!ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len))
goto err;
}
if (!PKCS7_is_detached(p7)) {
/*
* NOTE(emilia): I think we only reach os == NULL here because detached
* digested data support is broken.
*/
if (os == NULL)
goto err;
if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
char *cont;
long contlen;
btmp = BIO_find_type(bio, BIO_TYPE_MEM);
if (btmp == NULL) {
ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
goto err;
}
contlen = BIO_get_mem_data(btmp, &cont);
/*
* Mark the BIO read only then we can use its copy of the data
* instead of making an extra copy.
*/
BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
BIO_set_mem_eof_return(btmp, 0);
ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
}
}
ret = 1;
err:
EVP_MD_CTX_free(ctx_tmp);
return ret;
}
int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
{
EVP_MD_CTX *mctx;
EVP_PKEY_CTX *pctx = NULL;
unsigned char *abuf = NULL;
int alen;
size_t siglen;
const EVP_MD *md = NULL;
const PKCS7_CTX *ctx = si->ctx;
md = EVP_get_digestbyobj(si->digest_alg->algorithm);
if (md == NULL)
return 0;
mctx = EVP_MD_CTX_new();
if (mctx == NULL) {
ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
goto err;
}
if (EVP_DigestSignInit_ex(mctx, &pctx, EVP_MD_get0_name(md),
ossl_pkcs7_ctx_get0_libctx(ctx),
ossl_pkcs7_ctx_get0_propq(ctx), si->pkey,
NULL) <= 0)
goto err;
alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
if (alen < 0 || abuf == NULL)
goto err;
if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
goto err;
OPENSSL_free(abuf);
abuf = NULL;
if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
goto err;
abuf = OPENSSL_malloc(siglen);
if (abuf == NULL)
goto err;
if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
goto err;
EVP_MD_CTX_free(mctx);
ASN1_STRING_set0(si->enc_digest, abuf, siglen);
return 1;
err:
OPENSSL_free(abuf);
EVP_MD_CTX_free(mctx);
return 0;
}
/* This partly overlaps with PKCS7_verify(). It does not support flags. */