/* 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_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()); if (bio == NULL) goto err; /* * 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); }