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); rsk=p7->d.signed_and_enveloped->recipientinfo; 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); }
/** * functionName : pkcs7_signed_and_envelop_print * @Param : PKCS7_SIGN_ENVELOPE * envelop [ signed and enveloped ] * Brief : * print signed and enveloped data * return : null */ void pkcs7_signed_and_envelop_print(PKCS7_SIGN_ENVELOPE* envelop){ BIO *out ; printf("========================= PKCS7 SIGNED AND ENVELOP ===========================\n"); asn1_integer_print(envelop->version,"Envelop version"); asn1_object_print(envelop->enc_data->content_type,"ENCRYPT_DATA_TYPE"); printf("ENCRYPT_DATA_ALGORITHM:\t"); out = BIO_new(BIO_s_file()); X509_ALGOR_print(out,envelop->enc_data->algorithm); BIO_free(out); printf("ENCRYPT_DATA_ENC Data:\t"); asn1_octet_string_print(envelop->enc_data->enc_data); printf("[STACK] RECIPIENT INFO PRINT\n"); int num,i,recip_ver; PKCS7_RECIP_INFO *recip; num = sk_PKCS7_RECIP_INFO_num(envelop->recipientinfo); for(i = 0; i < num; i++){ //print recipient version printf("RECIPIENT-%d:\n",i); recip = sk_PKCS7_RECIP_INFO_value(envelop->recipientinfo,i); pkcs7_recip_print(recip); asn1_integer_print(recip->version,"Envelop stack recipientinfo version"); } printf("[STACK] RECIPIENT INFO PRINT PRIN END\n"); printf("========================= PKCS7 SIGNED AND ENVELOP ===========================\n"); }
static VALUE ossl_pkcs7_get_recipient(VALUE self) { PKCS7 *pkcs7; STACK_OF(PKCS7_RECIP_INFO) *sk; PKCS7_RECIP_INFO *si; int num, i; VALUE ary; GetPKCS7(self, pkcs7); if (PKCS7_type_is_enveloped(pkcs7)) sk = pkcs7->d.enveloped->recipientinfo; else if (PKCS7_type_is_signedAndEnveloped(pkcs7)) sk = pkcs7->d.signed_and_enveloped->recipientinfo; else sk = NULL; if (!sk) return rb_ary_new(); if ((num = sk_PKCS7_RECIP_INFO_num(sk)) < 0) { ossl_raise(ePKCS7Error, "Negative number of recipient!"); } ary = rb_ary_new2(num); for (i=0; i<num; i++) { si = sk_PKCS7_RECIP_INFO_value(sk, i); rb_ary_push(ary, ossl_pkcs7ri_new(si)); } return ary; }
PKCS7_RECIP_INFO * PKI_X509_PKCS7_get_recipient_info ( PKI_X509_PKCS7 *p7, int idx ) { int type = 0; int recipients_num = 0; PKCS7_RECIP_INFO *ret = NULL; STACK_OF(PKCS7_RECIP_INFO) *r_sk = NULL; PKI_X509_PKCS7_VALUE *p7val = NULL; if ( !p7 || !p7->value ) return NULL; p7val = p7->value; if((recipients_num = PKI_X509_PKCS7_get_recipients_num ( p7 )) <= 0 ) { return NULL; } if ( recipients_num < idx ) return NULL; type = PKI_X509_PKCS7_get_type ( p7 ); switch ( type ) { case PKI_X509_PKCS7_TYPE_ENCRYPTED: r_sk = p7val->d.enveloped->recipientinfo; break; case PKI_X509_PKCS7_TYPE_SIGNEDANDENCRYPTED: r_sk = p7val->d.signed_and_enveloped->recipientinfo; break; default: r_sk = NULL; } if ( r_sk ) { ret = sk_PKCS7_RECIP_INFO_value ( r_sk, idx ); } return ret; }
/* 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: 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); }
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); }
/* 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; unsigned char *tmp=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; X509_ALGOR *xalg=NULL; PKCS7_RECIP_INFO *ri=NULL; 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); 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; } xalg=p7->d.signed_and_enveloped->enc_data->algorithm; 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; } xalg=p7->d.enveloped->enc_data->algorithm; 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 int jj; 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; } } jj=EVP_PKEY_size(pkey); tmp=(unsigned char *)OPENSSL_malloc(jj+10); if (tmp == NULL) { PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE); goto err; } /* If we haven't got a certificate try each ri in turn */ if (pcert == NULL) { for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) { ri=sk_PKCS7_RECIP_INFO_value(rsk,i); jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key), M_ASN1_STRING_length(ri->enc_key), pkey); if (jj > 0) break; ERR_clear_error(); ri = NULL; } if (ri == NULL) { PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_RECIPIENT_MATCHES_KEY); goto err; } } else { jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key), M_ASN1_STRING_length(ri->enc_key), pkey); if (jj <= 0) { PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_EVP_LIB); goto err; } } 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; if (jj != 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, jj)) { PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH); goto err; } } if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,tmp,NULL,0) <= 0) goto err; OPENSSL_cleanse(tmp,jj); 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); } #endif } BIO_push(out,bio); bio=NULL; #endif if (0) { err: 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; } if (tmp != NULL) OPENSSL_free(tmp); return(out); }
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; EVP_PKEY *pkey; 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; 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; int jj,max; unsigned char *tmp; 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) RAND_pseudo_bytes(iv,ivlen); 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(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0) goto err; } /* Lets do the pub key stuff :-) */ max=0; for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) { ri=sk_PKCS7_RECIP_INFO_value(rsk,i); if (ri->cert == NULL) { PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO); goto err; } pkey=X509_get_pubkey(ri->cert); jj=EVP_PKEY_size(pkey); EVP_PKEY_free(pkey); if (max < jj) max=jj; } if ((tmp=(unsigned char *)OPENSSL_malloc(max)) == NULL) { PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE); goto err; } for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) { ri=sk_PKCS7_RECIP_INFO_value(rsk,i); pkey=X509_get_pubkey(ri->cert); jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey); EVP_PKEY_free(pkey); if (jj <= 0) { PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB); OPENSSL_free(tmp); goto err; } if (!M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj)) { PKCS7err(PKCS7_F_PKCS7_DATAINIT, ERR_R_MALLOC_FAILURE); OPENSSL_free(tmp); goto err; } } OPENSSL_free(tmp); 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()); BIO_set_mem_eof_return(bio,0); } } BIO_push(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); }
/* Load a DER formatted file into internal SCEP_MSG structure */ SCEP_MSG *d2i_SCEP_MSG_bio (BIO *inbio) { BIO *outbio = NULL; BIO *p7bio = NULL; PKCS7 *p7 = NULL; // BIO *bio_err = NULL; SCEP_MSG *msg = NULL; int bytes, length, fd, used; int nMessageType = -1, nPkiStatus = -1; PKCS7_SIGNER_INFO *si = NULL; PKCS7_RECIP_INFO *ri = NULL; STACK_OF(X509_ATTRIBUTE) *sig_attribs = NULL; PKCS7 *p7env = NULL; SCEP_RECIP_INFO *rinfo = NULL; char buffer[1024]; char *data = NULL; char *tmp_string = NULL; int debug = 0; int i; // if ((bio_err=BIO_new(BIO_s_file())) != NULL) // BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT); msg = (SCEP_MSG *) OPENSSL_malloc ( sizeof(SCEP_MSG)); if( msg == NULL ) return (NULL); /* decode the data */ p7 = d2i_PKCS7_bio(inbio, NULL); if (p7 == NULL) goto err; /* make sure this is a signed data PKCS#7 */ // if (!PKCS7_type_is_signed(p7)) { // BIO_printf(bio_err, "%s:%d: supplied PKCS#7 is not signed " // "data\n", __FILE__, __LINE__); // goto err; // } /* create BIOs to read signed content data from */ p7bio = PKCS7_dataInit(p7, NULL); if (p7bio == NULL) goto err; /* Use an outbio and fill it with data from the p7 */ outbio = BIO_new(BIO_s_mem()); used = 0; for (;;) { bytes = BIO_read(p7bio, buffer, sizeof(buffer)); used += bytes; if (bytes <= 0) break; BIO_write(outbio, buffer, bytes); } BIO_flush(outbio); /* there should be exactly one signer info */ msg->sk_signer_info = PKCS7_get_signer_info(p7); if (msg->sk_signer_info == NULL) { goto err; } if (sk_PKCS7_SIGNER_INFO_num(msg->sk_signer_info) != 1) { goto err; } si = sk_PKCS7_SIGNER_INFO_value(msg->sk_signer_info, 0); msg->signer_ias = si->issuer_and_serial; msg->signer_cert = PKCS7_cert_from_signer_info( p7, si ); /* If msg->signer_cert == NULL there is no signer certificate, * otherwise the certificate is included into the PKCS#7 envelope * this certificate may be self signed, but for the PKCS7_ * signatureVerify method, this does not matter */ /* verify the PKCS#7 using the store just constructed */ if (PKCS7_signatureVerify(p7bio, p7, si, msg->signer_cert) <= 0) { // BIO_printf(bio_err, "%s:%d: verification failed\n", __FILE__, // __LINE__); goto err; } /* extract the signed attributes */ msg->attrs = PKCS7_get_signed_attributes(si); if ((msg->attrs == NULL) || (sk_X509_ATTRIBUTE_num(msg->attrs) == 0)){ goto err; } tmp_string = (char *) SCEP_get_string_attr_by_name(msg->attrs, "messageType"); if( tmp_string != NULL ) { msg->messageType = atoi( tmp_string ); free( tmp_string ); tmp_string = NULL; } else { msg->messageType = -1; } /* unpack the internal PKCS#7 */ p7env = d2i_PKCS7_bio(outbio, NULL); if (p7env == NULL) return msg; i=OBJ_obj2nid(p7env->type); msg->env_data.NID_p7data = i; msg->env_data.p7env = p7env; /* use a commodity variable */ rinfo = &(msg->env_data.recip_info); switch(i) { case NID_pkcs7_signed: break; case NID_pkcs7_signedAndEnveloped: rinfo->sk_recip_info = p7env->d.signed_and_enveloped->recipientinfo; break; case NID_pkcs7_enveloped: rinfo->sk_recip_info = p7env->d.enveloped->recipientinfo; break; default: // BIO_printf( bio_err, "%s:%d: unknown PKCS7 structure\n", // __FILE__, __LINE__); break; } /* Lets do the pub key stuff :-) */ // FIXME: usaly only 1, but pix has 4 in structure - to be clarified... // so currently set to 4 to get it working with cisco-pix if( sk_PKCS7_RECIP_INFO_num(rinfo->sk_recip_info) > 4 ) { goto err; } /* Let's get the recipient info at stack num 0, the first and * hopefully, the only one */ ri = sk_PKCS7_RECIP_INFO_value( rinfo->sk_recip_info, 0); /* Usually certificates are not present, but in case the standard * will be updated... */ // if (debug && ri->cert == NULL) { // BIO_printf( bio_err, // "%s:%d: Recipient info cert %d missing\n", // __FILE__, __LINE__, 0); // } rinfo->ias = ri->issuer_and_serial; /* if( rinfo->ias != NULL ) { BIO_printf(bio_err, "%s:%d: Recip cert issued by ", __FILE__, __LINE__); X509_NAME_print_ex (bio_err, rinfo->ias->issuer, 0, XN_FLAG_RFC2253&(~ASN1_STRFLGS_ESC_MSB)); BIO_printf(bio_err, "\n%s:%d: Recip cert serial: %s\n", __FILE__, __LINE__, BN_bn2hex(ASN1_INTEGER_to_BN(rinfo->ias->serial, NULL))); }; */ if( ri->cert ) { /* Usually this does not happen to be included in * the pkcs7env data, but in case we just get it */ sk_X509_push( rinfo->sk_recip_certs, ri->cert ); /* if ( debug ) { BIO_printf(bio_err, "%s:%d: Recipient cert for ", __FILE__, __LINE__); X509_NAME_print_ex (bio_err, X509_get_subject_name(ri->cert), 0, XN_FLAG_RFC2253&(~ASN1_STRFLGS_ESC_MSB)); BIO_printf(bio_err, "\n"); } */ } /* perform some consistency checks */ /* UniCert 3.1.2 seems to out the message type, so fudge */ /* the value of 3 (CertRep) if it is missing (problem pointed */ /* out by Peter Onion */ /* if (NULL == req->messageType) { BIO_printf(bio_err, "%s:%d: no message type (setting to 3)\n", __FILE__, __LINE__); req->messageType = "3"; // XXX should we strdup here? } */ /* UniCert doesn't seem to bother to put in a senderNonce, */ /* so don't get upset if it is missing. */ /* if (NULL == scep->senderNonce) { BIO_printf(bio_err, "%s:%d: senderNonce missing\n", __FILE__, __LINE__); } */ /* perform some type/status dependent checks */ /* if ((used == 0) && (nMessageType != 3)) { BIO_printf(bio_err, "%s:%d: only CertRep message may be " "empty\n", __FILE__, __LINE__); goto err; } if ((used == 0) && (nMessageType == 3) && (nPkiStatus == 0)) { BIO_printf(bio_err, "%s:%d: CertRep may only be empty for " "failure or pending\n", __FILE__, __LINE__); goto err; } */ /* no content is only allowed if the message is a CertRep with */ /* a pkiStatus of failure or pending */ /* if (used == 0) { BIO_printf(bio_err, "%s:%d: empty PKCSReq, must be failure or " "pending\n", __FILE__, __LINE__); goto signedonly; } if (debug) BIO_printf(bio_err, "%s:%d: working on inner pkcs#7\n", __FILE__, __LINE__); */ BIO_free(outbio); signedonly: /* we were successfull in extracting the telescoping PKCS#7's */ return(msg); err: // if( debug ) ERR_print_errors(bio_err); return(NULL); }
/* 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; uint8_t *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 ((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 = 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 */ vigortls_zeroize(ek, eklen); 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) { vigortls_zeroize(ek, eklen); free(ek); ek = NULL; } if (tkey) { vigortls_zeroize(tkey, tkeylen); free(tkey); tkey = NULL; } if (out == NULL) out = etmp; else BIO_push(out, etmp); etmp = NULL; } if (in_bio != NULL) { bio = in_bio; } else { if (data_body->length > 0) bio = BIO_new_mem_buf(data_body->data, data_body->length); else { bio = BIO_new(BIO_s_mem()); if (bio == NULL) goto err; BIO_set_mem_eof_return(bio, 0); } if (bio == NULL) goto err; } BIO_push(out, bio); bio = NULL; if (0) { err: if (ek) { vigortls_zeroize(ek, eklen); free(ek); } if (tkey) { vigortls_zeroize(tkey, tkeylen); 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); }
void format_smime_info(int pass, BODY *body, long msgno, gf_io_t pc) { PKCS7 *p7; int i; if(body->type == TYPEMULTIPART){ PART *p; for(p=body->nested.part; p; p=p->next) format_smime_info(pass, &p->body, msgno, pc); } p7 = body->sparep; if(p7){ if(PKCS7_type_is_signed(p7)){ STACK_OF(X509) *signers; switch(pass){ case 1: gf_puts(_("This message was cryptographically signed."), pc); gf_puts(NEWLINE, pc); break; case 2: signers = PKCS7_get0_signers(p7, NULL, 0); if(signers){ snprintf(tmp_20k_buf, SIZEOF_20KBUF, _("Certificate%s used for signing"), plural(sk_X509_num(signers))); gf_puts_uline(tmp_20k_buf, pc); gf_puts(NEWLINE, pc); print_separator_line(100, '-', pc); for(i=0; i<sk_X509_num(signers); i++){ X509 *x = sk_X509_value(signers, i); if(x){ output_cert_info(x, pc); gf_puts(NEWLINE, pc); } } } sk_X509_free(signers); break; } } else if(PKCS7_type_is_enveloped(p7)){ switch(pass){ case 1: gf_puts(_("This message was encrypted."), pc); gf_puts(NEWLINE, pc); break; case 2: if(p7->d.enveloped && p7->d.enveloped->enc_data){ X509_ALGOR *alg = p7->d.enveloped->enc_data->algorithm; STACK_OF(PKCS7_RECIP_INFO) *ris = p7->d.enveloped->recipientinfo; int found = 0; gf_puts(_("The algorithm used to encrypt was "), pc); if(alg){ char *n = (char *) OBJ_nid2sn( OBJ_obj2nid(alg->algorithm)); gf_puts(n ? n : "<unknown>", pc); } else gf_puts("<unknown>", pc); gf_puts("." NEWLINE NEWLINE, pc); snprintf(tmp_20k_buf, SIZEOF_20KBUF, _("Certificate%s for decrypting"), plural(sk_PKCS7_RECIP_INFO_num(ris))); gf_puts_uline(tmp_20k_buf, pc); gf_puts(NEWLINE, pc); print_separator_line(100, '-', pc); for(i=0; i<sk_PKCS7_RECIP_INFO_num(ris); i++){ PKCS7_RECIP_INFO *ri; PERSONAL_CERT *pcert; ri = sk_PKCS7_RECIP_INFO_value(ris, i); if(!ri) continue; pcert = find_certificate_matching_recip_info(ri); if(pcert){ if(found){ print_separator_line(25, '*', pc); gf_puts(NEWLINE, pc); } found = 1; output_cert_info(pcert->cert, pc); gf_puts(NEWLINE, pc); } } if(!found){ gf_puts(_("No certificate capable of decrypting could be found."), pc); gf_puts(NEWLINE, pc); gf_puts(NEWLINE, pc); } } break; } } } }
/* 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; unsigned char *tmp=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; 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); 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 unsigned char *tkey = NULL; int tkeylen; int jj; 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; } } jj=EVP_PKEY_size(pkey); tmp=(unsigned char *)OPENSSL_malloc(jj+10); if (tmp == NULL) { PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE); goto err; } /* If we haven't got a certificate try each ri in turn */ if (pcert == NULL) { /* Temporary storage in case EVP_PKEY_decrypt * overwrites output buffer on error. */ unsigned char *tmp2; tmp2 = OPENSSL_malloc(jj); if (!tmp2) goto err; jj = -1; /* Always attempt to decrypt all cases to avoid * leaking timing information about a successful * decrypt. */ for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) { int tret; ri=sk_PKCS7_RECIP_INFO_value(rsk,i); tret=EVP_PKEY_decrypt(tmp2, M_ASN1_STRING_data(ri->enc_key), M_ASN1_STRING_length(ri->enc_key), pkey); if (tret > 0) { memcpy(tmp, tmp2, tret); OPENSSL_cleanse(tmp2, tret); jj = tret; } ERR_clear_error(); } OPENSSL_free(tmp2); } else { jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key), M_ASN1_STRING_length(ri->enc_key), pkey); 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 to counter MMA */ 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 we have no key use random key */ if (jj <= 0) { OPENSSL_free(tmp); jj = tkeylen; tmp = tkey; tkey = NULL; } if (jj != tkeylen) { /* 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, jj)) { /* As MMA defence use random key instead */ OPENSSL_cleanse(tmp, jj); OPENSSL_free(tmp); jj = tkeylen; tmp = tkey; tkey = NULL; } } ERR_clear_error(); if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,tmp,NULL,0) <= 0) goto err; OPENSSL_cleanse(tmp,jj); if (tkey) { OPENSSL_cleanse(tkey, tkeylen); OPENSSL_free(tkey); } 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()); BIO_set_mem_eof_return(bio,0); } if (bio == NULL) goto err; #endif } BIO_push(out,bio); bio=NULL; #endif if (0) { err: 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; } if (tmp != NULL) OPENSSL_free(tmp); return(out); }