diff options
Diffstat (limited to 'thirdparty/openssl/crypto/pkcs7/pk7_doit.c')
| -rw-r--r-- | thirdparty/openssl/crypto/pkcs7/pk7_doit.c | 1295 |
1 files changed, 1295 insertions, 0 deletions
diff --git a/thirdparty/openssl/crypto/pkcs7/pk7_doit.c b/thirdparty/openssl/crypto/pkcs7/pk7_doit.c new file mode 100644 index 0000000000..946aaa6543 --- /dev/null +++ b/thirdparty/openssl/crypto/pkcs7/pk7_doit.c @@ -0,0 +1,1295 @@ +/* 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; + + if (p7 == NULL) { + PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER); + return NULL; + } + /* + * 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) { + PKCS7err(PKCS7_F_PKCS7_DATAINIT, 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_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; + + if (p7 == NULL) { + PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER); + return NULL; + } + + if (p7->d.ptr == NULL) { + PKCS7err(PKCS7_F_PKCS7_DATADECODE, 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) { + 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 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; + 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 is NULL if the optional EncryptedContent is missing. */ + 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; + } + + /* Detached content must be supplied via in_bio instead. */ + if (data_body == NULL && in_bio == NULL) { + PKCS7err(PKCS7_F_PKCS7_DATADECODE, 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) { + 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 (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()); + if (bio == NULL) + goto err; + 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; + + if (p7 == NULL) { + PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER); + return 0; + } + + if (p7->d.ptr == NULL) { + PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT); + return 0; + } + + 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); + 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) { + M_ASN1_OCTET_STRING_free(os); + os = NULL; + 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)) { + /* + * 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) { + 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 (p7 == NULL) { + PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER); + return 0; + } + + if (p7->d.ptr == NULL) { + PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT); + return 0; + } + + 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; + 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); +} |