--- /dev/null
+/* crypto/pkcs7/pk7_doit.c */
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to. The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code. The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * "This product includes cryptographic software written by
+ * Eric Young (eay@cryptsoft.com)"
+ * The word 'cryptographic' can be left out if the rouines from the library
+ * being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ * the apps directory (application code) you must include an acknowledgement:
+ * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed. i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ */
+
+#include <stdio.h>
+#include "cryptlib.h"
+#include <openssl/rand.h>
+#include <openssl/objects.h>
+#include <openssl/x509.h>
+#include <openssl/x509v3.h>
+#include <openssl/err.h>
+
+static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
+ void *value);
+static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
+
+static 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;
+
+ }
+
+static 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 int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
+ {
+ BIO *btmp;
+ const EVP_MD *md;
+ if ((btmp=BIO_new(BIO_f_md())) == NULL)
+ {
+ PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
+ goto err;
+ }
+
+ md=EVP_get_digestbyobj(alg->algorithm);
+ if (md == NULL)
+ {
+ PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,PKCS7_R_UNKNOWN_DIGEST_TYPE);
+ goto err;
+ }
+
+ BIO_set_md(btmp,md);
+ if (*pbio == NULL)
+ *pbio=btmp;
+ else if (!BIO_push(*pbio,btmp))
+ {
+ PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
+ goto err;
+ }
+ btmp=NULL;
+
+ return 1;
+
+ err:
+ if (btmp)
+ 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;
+
+ pkey = X509_get_pubkey(ri->cert);
+
+ if (!pkey)
+ return 0;
+
+ pctx = EVP_PKEY_CTX_new(pkey, NULL);
+ if (!pctx)
+ return 0;
+
+ if (EVP_PKEY_encrypt_init(pctx) <= 0)
+ goto err;
+
+ if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
+ EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0)
+ {
+ PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
+ goto err;
+ }
+
+ if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
+ goto err;
+
+ ek = OPENSSL_malloc(eklen);
+
+ if (ek == NULL)
+ {
+ PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
+ 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:
+ if (pkey)
+ EVP_PKEY_free(pkey);
+ if (pctx)
+ EVP_PKEY_CTX_free(pctx);
+ if (ek)
+ OPENSSL_free(ek);
+ return ret;
+
+ }
+
+
+static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
+ PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey)
+ {
+ EVP_PKEY_CTX *pctx = NULL;
+ unsigned char *ek = NULL;
+ size_t eklen;
+
+ int ret = -1;
+
+ pctx = EVP_PKEY_CTX_new(pkey, NULL);
+ if (!pctx)
+ return -1;
+
+ if (EVP_PKEY_decrypt_init(pctx) <= 0)
+ goto err;
+
+ if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
+ EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
+ goto err;
+ }
+
+ if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
+ ri->enc_key->data, ri->enc_key->length) <= 0)
+ goto err;
+
+ ek = OPENSSL_malloc(eklen);
+
+ if (ek == NULL)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ if (EVP_PKEY_decrypt(pctx, ek, &eklen,
+ ri->enc_key->data, ri->enc_key->length) <= 0)
+ {
+ ret = 0;
+ PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
+ goto err;
+ }
+
+ ret = 1;
+
+ if (*pek)
+ {
+ OPENSSL_cleanse(*pek, *peklen);
+ OPENSSL_free(*pek);
+ }
+
+ *pek = ek;
+ *peklen = eklen;
+
+ err:
+ if (pctx)
+ EVP_PKEY_CTX_free(pctx);
+ if (!ret && ek)
+ OPENSSL_free(ek);
+
+ return ret;
+ }
+
+BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
+ {
+ int i;
+ BIO *out=NULL,*btmp=NULL;
+ X509_ALGOR *xa = NULL;
+ 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;
+
+ 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_get_octet_string(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)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATAINIT,
+ 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)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATAINIT,
+ PKCS7_R_CIPHER_NOT_INITIALIZED);
+ goto err;
+ }
+ break;
+ case NID_pkcs7_digest:
+ xa = p7->d.digest->md;
+ os = PKCS7_get_octet_string(p7->d.digest->contents);
+ break;
+ case NID_pkcs7_data:
+ break;
+ default:
+ PKCS7err(PKCS7_F_PKCS7_DATAINIT,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)))
+ goto err;
+
+ if (xa && !PKCS7_bio_add_digest(&out, xa))
+ 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)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
+ goto err;
+ }
+ BIO_get_cipher_ctx(btmp, &ctx);
+ keylen=EVP_CIPHER_key_length(evp_cipher);
+ ivlen=EVP_CIPHER_iv_length(evp_cipher);
+ xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
+ if (ivlen > 0)
+ if (RAND_pseudo_bytes(iv,ivlen) <= 0)
+ goto err;
+ if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1)<=0)
+ goto err;
+ 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 && os->length > 0)
+ bio = BIO_new_mem_buf(os->data, os->length);
+ if(bio == NULL)
+ {
+ bio=BIO_new(BIO_s_mem());
+ if (bio == NULL)
+ goto err;
+ BIO_set_mem_eof_return(bio,0);
+ }
+ }
+ if (out)
+ BIO_push(out,bio);
+ else
+ out = bio;
+ bio=NULL;
+ if (0)
+ {
+err:
+ if (out != NULL)
+ BIO_free_all(out);
+ if (btmp != NULL)
+ BIO_free_all(btmp);
+ out=NULL;
+ }
+ return(out);
+ }
+
+static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
+ {
+ int ret;
+ ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
+ pcert->cert_info->issuer);
+ if (ret)
+ return ret;
+ return M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
+ ri->issuer_and_serial->serial);
+ }
+
+/* int */
+BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
+ {
+ int i,j;
+ BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
+ X509_ALGOR *xa;
+ ASN1_OCTET_STRING *data_body=NULL;
+ const EVP_MD *evp_md;
+ const EVP_CIPHER *evp_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;
+
+ i=OBJ_obj2nid(p7->type);
+ p7->state=PKCS7_S_HEADER;
+
+ switch (i)
+ {
+ case NID_pkcs7_signed:
+ data_body=PKCS7_get_octet_string(p7->d.sign->contents);
+ if (!PKCS7_is_detached(p7) && data_body == NULL)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATADECODE,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=p7->d.signed_and_enveloped->enc_data->enc_data;
+ enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
+ evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
+ if (evp_cipher == NULL)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
+ goto err;
+ }
+ break;
+ case NID_pkcs7_enveloped:
+ rsk=p7->d.enveloped->recipientinfo;
+ enc_alg=p7->d.enveloped->enc_data->algorithm;
+ data_body=p7->d.enveloped->enc_data->enc_data;
+ evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
+ if (evp_cipher == NULL)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
+ goto err;
+ }
+ break;
+ default:
+ PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
+ 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)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
+ goto err;
+ }
+
+ j=OBJ_obj2nid(xa->algorithm);
+ evp_md=EVP_get_digestbynid(j);
+ if (evp_md == NULL)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
+ goto err;
+ }
+
+ BIO_set_md(btmp,evp_md);
+ if (out == NULL)
+ out=btmp;
+ else
+ BIO_push(out,btmp);
+ btmp=NULL;
+ }
+ }
+
+ if (evp_cipher != NULL)
+ {
+#if 0
+ unsigned char key[EVP_MAX_KEY_LENGTH];
+ unsigned char iv[EVP_MAX_IV_LENGTH];
+ unsigned char *p;
+ int keylen,ivlen;
+ int max;
+ X509_OBJECT ret;
+#endif
+
+ if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATADECODE,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)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATADECODE,
+ 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 sucess 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);
+
+ if (pkcs7_decrypt_rinfo(&ek, &eklen,
+ ri, pkey) < 0)
+ goto err;
+ ERR_clear_error();
+ }
+ }
+ else
+ {
+ /* Only exit on fatal errors, not decrypt failure */
+ if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
+ goto err;
+ ERR_clear_error();
+ }
+
+ evp_ctx=NULL;
+ BIO_get_cipher_ctx(etmp,&evp_ctx);
+ if (EVP_CipherInit_ex(evp_ctx,evp_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 */
+ tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
+ tkey = OPENSSL_malloc(tkeylen);
+ if (!tkey)
+ 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_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))
+ {
+ /* Use random key as MMA defence */
+ OPENSSL_cleanse(ek, eklen);
+ OPENSSL_free(ek);
+ 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;
+
+ if (ek)
+ {
+ OPENSSL_cleanse(ek,eklen);
+ OPENSSL_free(ek);
+ ek = NULL;
+ }
+ if (tkey)
+ {
+ OPENSSL_cleanse(tkey,tkeylen);
+ OPENSSL_free(tkey);
+ tkey = NULL;
+ }
+
+ if (out == NULL)
+ out=etmp;
+ else
+ BIO_push(out,etmp);
+ etmp=NULL;
+ }
+
+#if 1
+ if (PKCS7_is_detached(p7) || (in_bio != NULL))
+ {
+ bio=in_bio;
+ }
+ else
+ {
+#if 0
+ bio=BIO_new(BIO_s_mem());
+ /* We need to set this so that when we have read all
+ * the data, the encrypt BIO, if present, will read
+ * EOF and encode the last few bytes */
+ BIO_set_mem_eof_return(bio,0);
+
+ if (data_body->length > 0)
+ BIO_write(bio,(char *)data_body->data,data_body->length);
+#else
+ if (data_body->length > 0)
+ bio = BIO_new_mem_buf(data_body->data,data_body->length);
+ else {
+ bio=BIO_new(BIO_s_mem());
+ BIO_set_mem_eof_return(bio,0);
+ }
+ if (bio == NULL)
+ goto err;
+#endif
+ }
+ BIO_push(out,bio);
+ bio=NULL;
+#endif
+ if (0)
+ {
+err:
+ if (ek)
+ {
+ OPENSSL_cleanse(ek,eklen);
+ OPENSSL_free(ek);
+ }
+ if (tkey)
+ {
+ OPENSSL_cleanse(tkey,tkeylen);
+ OPENSSL_free(tkey);
+ }
+ if (out != NULL) BIO_free_all(out);
+ if (btmp != NULL) BIO_free_all(btmp);
+ if (etmp != NULL) BIO_free_all(etmp);
+ if (bio != NULL) BIO_free_all(bio);
+ out=NULL;
+ }
+ return(out);
+ }
+
+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)
+ {
+ PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
+ return NULL;
+ }
+ BIO_get_md_ctx(bio,pmd);
+ if (*pmd == NULL)
+ {
+ PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
+ if (EVP_MD_CTX_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))
+ {
+ PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB,
+ ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ }
+
+ /* Add digest */
+ if (!EVP_DigestFinal_ex(mctx, md_data,&md_len))
+ {
+ PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
+ return 0;
+ }
+ if (!PKCS7_add1_attrib_digest(si, md_data, md_len))
+ {
+ PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
+ 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;
+
+ EVP_MD_CTX_init(&ctx_tmp);
+ 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)
+ {
+ os=M_ASN1_OCTET_STRING_new();
+ if (!os)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
+ 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)
+ {
+ os=M_ASN1_OCTET_STRING_new();
+ if (!os)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
+ 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) {
+ M_ASN1_OCTET_STRING_free(os);
+ 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)
+ {
+ M_ASN1_OCTET_STRING_free(os);
+ p7->d.digest->contents->d.data = NULL;
+ }
+ break;
+
+ default:
+ PKCS7err(PKCS7_F_PKCS7_DATAFINAL,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;
+ abuflen = EVP_PKEY_size(si->pkey);
+ abuf = OPENSSL_malloc(abuflen);
+ if (!abuf)
+ goto err;
+
+ if (!EVP_SignFinal(&ctx_tmp, abuf, &abuflen,
+ si->pkey))
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
+ 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;
+ M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
+ }
+
+ if (!PKCS7_is_detached(p7) && !(os->flags & ASN1_STRING_FLAG_NDEF))
+ {
+ char *cont;
+ long contlen;
+ btmp=BIO_find_type(bio,BIO_TYPE_MEM);
+ if (btmp == NULL)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATAFINAL,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_cleanup(&ctx_tmp);
+ return(ret);
+ }
+
+int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
+ {
+ EVP_MD_CTX mctx;
+ EVP_PKEY_CTX *pctx;
+ unsigned char *abuf = NULL;
+ int alen;
+ size_t siglen;
+ const EVP_MD *md = NULL;
+
+ md = EVP_get_digestbyobj(si->digest_alg->algorithm);
+ if (md == NULL)
+ return 0;
+
+ EVP_MD_CTX_init(&mctx);
+ if (EVP_DigestSignInit(&mctx, &pctx, md,NULL, si->pkey) <= 0)
+ goto err;
+
+ if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
+ EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0)
+ {
+ PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
+ goto err;
+ }
+
+ alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr,&abuf,
+ ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
+ if(!abuf)
+ 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)
+ goto err;
+ if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
+ goto err;
+
+ if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
+ EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0)
+ {
+ PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
+ goto err;
+ }
+
+ EVP_MD_CTX_cleanup(&mctx);
+
+ ASN1_STRING_set0(si->enc_digest, abuf, siglen);
+
+ return 1;
+
+ err:
+ if (abuf)
+ OPENSSL_free(abuf);
+ EVP_MD_CTX_cleanup(&mctx);
+ return 0;
+
+ }
+
+int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
+ PKCS7 *p7, PKCS7_SIGNER_INFO *si)
+ {
+ PKCS7_ISSUER_AND_SERIAL *ias;
+ int ret=0,i;
+ STACK_OF(X509) *cert;
+ X509 *x509;
+
+ if (PKCS7_type_is_signed(p7))
+ {
+ cert=p7->d.sign->cert;
+ }
+ else if (PKCS7_type_is_signedAndEnveloped(p7))
+ {
+ cert=p7->d.signed_and_enveloped->cert;
+ }
+ else
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
+ goto err;
+ }
+ /* XXXXXXXXXXXXXXXXXXXXXXX */
+ ias=si->issuer_and_serial;
+
+ x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
+
+ /* were we able to find the cert in passed to us */
+ if (x509 == NULL)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
+ goto err;
+ }
+
+ /* Lets verify */
+ if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
+ goto err;
+ }
+ X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
+ i=X509_verify_cert(ctx);
+ if (i <= 0)
+ {
+ PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
+ X509_STORE_CTX_cleanup(ctx);
+ goto err;
+ }
+ X509_STORE_CTX_cleanup(ctx);
+
+ return PKCS7_signatureVerify(bio, p7, si, x509);
+ err:
+ return ret;
+ }
+
+int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
+ X509 *x509)
+ {
+ ASN1_OCTET_STRING *os;
+ EVP_MD_CTX mdc_tmp,*mdc;
+ int ret=0,i;
+ int md_type;
+ STACK_OF(X509_ATTRIBUTE) *sk;
+ BIO *btmp;
+ EVP_PKEY *pkey;
+
+ EVP_MD_CTX_init(&mdc_tmp);
+
+ if (!PKCS7_type_is_signed(p7) &&
+ !PKCS7_type_is_signedAndEnveloped(p7)) {
+ PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
+ PKCS7_R_WRONG_PKCS7_TYPE);
+ goto err;
+ }
+
+ md_type=OBJ_obj2nid(si->digest_alg->algorithm);
+
+ btmp=bio;
+ for (;;)
+ {
+ if ((btmp == NULL) ||
+ ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
+ {
+ PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
+ PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
+ goto err;
+ }
+ BIO_get_md_ctx(btmp,&mdc);
+ if (mdc == NULL)
+ {
+ PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ if (EVP_MD_CTX_type(mdc) == md_type)
+ break;
+ /* Workaround for some broken clients that put the signature
+ * OID instead of the digest OID in digest_alg->algorithm
+ */
+ if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
+ break;
+ btmp=BIO_next(btmp);
+ }
+
+ /* mdc is the digest ctx that we want, unless there are attributes,
+ * in which case the digest is the signed attributes */
+ if (!EVP_MD_CTX_copy_ex(&mdc_tmp,mdc))
+ goto err;
+
+ sk=si->auth_attr;
+ if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
+ {
+ unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
+ unsigned int md_len;
+ int alen;
+ ASN1_OCTET_STRING *message_digest;
+
+ if (!EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len))
+ goto err;
+ message_digest=PKCS7_digest_from_attributes(sk);
+ if (!message_digest)
+ {
+ PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
+ PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
+ goto err;
+ }
+ if ((message_digest->length != (int)md_len) ||
+ (memcmp(message_digest->data,md_dat,md_len)))
+ {
+#if 0
+{
+int ii;
+for (ii=0; ii<message_digest->length; ii++)
+ printf("%02X",message_digest->data[ii]); printf(" sent\n");
+for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
+}
+#endif
+ PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
+ PKCS7_R_DIGEST_FAILURE);
+ ret= -1;
+ goto err;
+ }
+
+ if (!EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL))
+ goto err;
+
+ alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
+ ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
+ if (alen <= 0)
+ {
+ PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,ERR_R_ASN1_LIB);
+ ret = -1;
+ goto err;
+ }
+ if (!EVP_VerifyUpdate(&mdc_tmp, abuf, alen))
+ goto err;
+
+ OPENSSL_free(abuf);
+ }
+
+ os=si->enc_digest;
+ pkey = X509_get_pubkey(x509);
+ if (!pkey)
+ {
+ ret = -1;
+ goto err;
+ }
+
+ i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
+ EVP_PKEY_free(pkey);
+ if (i <= 0)
+ {
+ PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
+ PKCS7_R_SIGNATURE_FAILURE);
+ ret= -1;
+ goto err;
+ }
+ else
+ ret=1;
+err:
+ EVP_MD_CTX_cleanup(&mdc_tmp);
+ return(ret);
+ }
+
+PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
+ {
+ STACK_OF(PKCS7_RECIP_INFO) *rsk;
+ PKCS7_RECIP_INFO *ri;
+ int i;
+
+ i=OBJ_obj2nid(p7->type);
+ if (i != NID_pkcs7_signedAndEnveloped)
+ return NULL;
+ if (p7->d.signed_and_enveloped == NULL)
+ return NULL;
+ rsk=p7->d.signed_and_enveloped->recipientinfo;
+ if (rsk == NULL)
+ return NULL;
+ ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
+ if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
+ ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
+ return(ri->issuer_and_serial);
+ }
+
+ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
+ {
+ return(get_attribute(si->auth_attr,nid));
+ }
+
+ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
+ {
+ return(get_attribute(si->unauth_attr,nid));
+ }
+
+static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
+ {
+ int i;
+ X509_ATTRIBUTE *xa;
+ ASN1_OBJECT *o;
+
+ o=OBJ_nid2obj(nid);
+ if (!o || !sk) return(NULL);
+ for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
+ {
+ xa=sk_X509_ATTRIBUTE_value(sk,i);
+ if (OBJ_cmp(xa->object,o) == 0)
+ {
+ if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
+ return(sk_ASN1_TYPE_value(xa->value.set,0));
+ else
+ return(NULL);
+ }
+ }
+ return(NULL);
+ }
+
+ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
+{
+ ASN1_TYPE *astype;
+ if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
+ return astype->value.octet_string;
+}
+
+int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
+ STACK_OF(X509_ATTRIBUTE) *sk)
+ {
+ int i;
+
+ if (p7si->auth_attr != NULL)
+ sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
+ p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
+ if (p7si->auth_attr == NULL)
+ return 0;
+ for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
+ {
+ if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
+ X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
+ == NULL)
+ return(0);
+ }
+ return(1);
+ }
+
+int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
+ {
+ int i;
+
+ if (p7si->unauth_attr != NULL)
+ sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
+ X509_ATTRIBUTE_free);
+ p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
+ if (p7si->unauth_attr == NULL)
+ return 0;
+ for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
+ {
+ if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
+ X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
+ == NULL)
+ return(0);
+ }
+ return(1);
+ }
+
+int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
+ void *value)
+ {
+ return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
+ }
+
+int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
+ void *value)
+ {
+ return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
+ }
+
+static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
+ void *value)
+ {
+ X509_ATTRIBUTE *attr=NULL;
+
+ if (*sk == NULL)
+ {
+ *sk = sk_X509_ATTRIBUTE_new_null();
+ if (*sk == NULL)
+ return 0;
+new_attrib:
+ if (!(attr=X509_ATTRIBUTE_create(nid,atrtype,value)))
+ return 0;
+ if (!sk_X509_ATTRIBUTE_push(*sk,attr))
+ {
+ X509_ATTRIBUTE_free(attr);
+ return 0;
+ }
+ }
+ else
+ {
+ int i;
+
+ for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
+ {
+ attr=sk_X509_ATTRIBUTE_value(*sk,i);
+ if (OBJ_obj2nid(attr->object) == nid)
+ {
+ X509_ATTRIBUTE_free(attr);
+ attr=X509_ATTRIBUTE_create(nid,atrtype,value);
+ if (attr == NULL)
+ return 0;
+ if (!sk_X509_ATTRIBUTE_set(*sk,i,attr))
+ {
+ X509_ATTRIBUTE_free(attr);
+ return 0;
+ }
+ goto end;
+ }
+ }
+ goto new_attrib;
+ }
+end:
+ return(1);
+ }
+
projects / cassiopeia.git / blobdiff