644 lines
15 KiB
C
644 lines
15 KiB
C
/*
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* Copyright (c) 2005 - 2007 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "hx_locl.h"
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RCSID("$Id: ks_file.c 22465 2008-01-16 14:25:24Z lha $");
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typedef enum { USE_PEM, USE_DER } outformat;
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struct ks_file {
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hx509_certs certs;
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char *fn;
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outformat format;
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};
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/*
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*
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*/
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static int
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parse_certificate(hx509_context context, const char *fn,
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struct hx509_collector *c,
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const hx509_pem_header *headers,
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const void *data, size_t len)
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{
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hx509_cert cert;
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int ret;
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ret = hx509_cert_init_data(context, data, len, &cert);
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if (ret)
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return ret;
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ret = _hx509_collector_certs_add(context, c, cert);
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hx509_cert_free(cert);
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return ret;
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}
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static int
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try_decrypt(hx509_context context,
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struct hx509_collector *collector,
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const AlgorithmIdentifier *alg,
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const EVP_CIPHER *c,
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const void *ivdata,
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const void *password,
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size_t passwordlen,
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const void *cipher,
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size_t len)
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{
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heim_octet_string clear;
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size_t keylen;
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void *key;
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int ret;
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keylen = EVP_CIPHER_key_length(c);
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key = malloc(keylen);
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if (key == NULL) {
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hx509_clear_error_string(context);
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return ENOMEM;
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}
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ret = EVP_BytesToKey(c, EVP_md5(), ivdata,
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password, passwordlen,
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1, key, NULL);
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if (ret <= 0) {
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hx509_set_error_string(context, 0, HX509_CRYPTO_INTERNAL_ERROR,
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"Failed to do string2key for private key");
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return HX509_CRYPTO_INTERNAL_ERROR;
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}
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clear.data = malloc(len);
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if (clear.data == NULL) {
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hx509_set_error_string(context, 0, ENOMEM,
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"Out of memory to decrypt for private key");
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ret = ENOMEM;
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goto out;
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}
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clear.length = len;
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{
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EVP_CIPHER_CTX ctx;
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EVP_CIPHER_CTX_init(&ctx);
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EVP_CipherInit_ex(&ctx, c, NULL, key, ivdata, 0);
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EVP_Cipher(&ctx, clear.data, cipher, len);
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EVP_CIPHER_CTX_cleanup(&ctx);
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}
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ret = _hx509_collector_private_key_add(context,
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collector,
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alg,
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NULL,
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&clear,
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NULL);
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memset(clear.data, 0, clear.length);
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free(clear.data);
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out:
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memset(key, 0, keylen);
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free(key);
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return ret;
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}
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static int
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parse_rsa_private_key(hx509_context context, const char *fn,
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struct hx509_collector *c,
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const hx509_pem_header *headers,
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const void *data, size_t len)
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{
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int ret = 0;
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const char *enc;
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enc = hx509_pem_find_header(headers, "Proc-Type");
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if (enc) {
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const char *dek;
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char *type, *iv;
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ssize_t ssize, size;
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void *ivdata;
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const EVP_CIPHER *cipher;
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const struct _hx509_password *pw;
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hx509_lock lock;
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int i, decrypted = 0;
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lock = _hx509_collector_get_lock(c);
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if (lock == NULL) {
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hx509_set_error_string(context, 0, HX509_ALG_NOT_SUPP,
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"Failed to get password for "
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"password protected file %s", fn);
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return HX509_ALG_NOT_SUPP;
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}
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if (strcmp(enc, "4,ENCRYPTED") != 0) {
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hx509_set_error_string(context, 0, HX509_PARSING_KEY_FAILED,
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"RSA key encrypted in unknown method %s "
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"in file",
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enc, fn);
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hx509_clear_error_string(context);
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return HX509_PARSING_KEY_FAILED;
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}
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dek = hx509_pem_find_header(headers, "DEK-Info");
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if (dek == NULL) {
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hx509_set_error_string(context, 0, HX509_PARSING_KEY_FAILED,
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"Encrypted RSA missing DEK-Info");
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return HX509_PARSING_KEY_FAILED;
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}
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type = strdup(dek);
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if (type == NULL) {
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hx509_clear_error_string(context);
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return ENOMEM;
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}
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iv = strchr(type, ',');
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if (iv == NULL) {
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free(type);
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hx509_set_error_string(context, 0, HX509_PARSING_KEY_FAILED,
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"IV missing");
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return HX509_PARSING_KEY_FAILED;
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}
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*iv++ = '\0';
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size = strlen(iv);
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ivdata = malloc(size);
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if (ivdata == NULL) {
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hx509_clear_error_string(context);
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free(type);
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return ENOMEM;
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}
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cipher = EVP_get_cipherbyname(type);
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if (cipher == NULL) {
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free(ivdata);
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hx509_set_error_string(context, 0, HX509_ALG_NOT_SUPP,
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"RSA key encrypted with "
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"unsupported cipher: %s",
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type);
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free(type);
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return HX509_ALG_NOT_SUPP;
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}
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#define PKCS5_SALT_LEN 8
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ssize = hex_decode(iv, ivdata, size);
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free(type);
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type = NULL;
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iv = NULL;
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if (ssize < 0 || ssize < PKCS5_SALT_LEN || ssize < EVP_CIPHER_iv_length(cipher)) {
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free(ivdata);
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hx509_set_error_string(context, 0, HX509_PARSING_KEY_FAILED,
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"Salt have wrong length in RSA key file");
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return HX509_PARSING_KEY_FAILED;
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}
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pw = _hx509_lock_get_passwords(lock);
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if (pw != NULL) {
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const void *password;
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size_t passwordlen;
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for (i = 0; i < pw->len; i++) {
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password = pw->val[i];
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passwordlen = strlen(password);
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ret = try_decrypt(context, c, hx509_signature_rsa(),
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cipher, ivdata, password, passwordlen,
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data, len);
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if (ret == 0) {
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decrypted = 1;
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break;
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}
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}
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}
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if (!decrypted) {
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hx509_prompt prompt;
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char password[128];
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memset(&prompt, 0, sizeof(prompt));
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prompt.prompt = "Password for keyfile: ";
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prompt.type = HX509_PROMPT_TYPE_PASSWORD;
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prompt.reply.data = password;
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prompt.reply.length = sizeof(password);
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ret = hx509_lock_prompt(lock, &prompt);
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if (ret == 0)
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ret = try_decrypt(context, c, hx509_signature_rsa(),
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cipher, ivdata, password, strlen(password),
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data, len);
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/* XXX add password to lock password collection ? */
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memset(password, 0, sizeof(password));
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}
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free(ivdata);
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} else {
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heim_octet_string keydata;
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keydata.data = rk_UNCONST(data);
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keydata.length = len;
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ret = _hx509_collector_private_key_add(context,
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c,
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hx509_signature_rsa(),
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NULL,
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&keydata,
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NULL);
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}
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return ret;
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}
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struct pem_formats {
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const char *name;
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int (*func)(hx509_context, const char *, struct hx509_collector *,
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const hx509_pem_header *, const void *, size_t);
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} formats[] = {
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{ "CERTIFICATE", parse_certificate },
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{ "RSA PRIVATE KEY", parse_rsa_private_key }
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};
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struct pem_ctx {
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int flags;
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struct hx509_collector *c;
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};
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static int
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pem_func(hx509_context context, const char *type,
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const hx509_pem_header *header,
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const void *data, size_t len, void *ctx)
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{
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struct pem_ctx *pem_ctx = (struct pem_ctx*)ctx;
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int ret = 0, j;
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for (j = 0; j < sizeof(formats)/sizeof(formats[0]); j++) {
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const char *q = formats[j].name;
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if (strcasecmp(type, q) == 0) {
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ret = (*formats[j].func)(context, NULL, pem_ctx->c, header, data, len);
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if (ret == 0)
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break;
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}
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}
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if (j == sizeof(formats)/sizeof(formats[0])) {
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ret = HX509_UNSUPPORTED_OPERATION;
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hx509_set_error_string(context, 0, ret,
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"Found no matching PEM format for %s", type);
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return ret;
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}
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if (ret && (pem_ctx->flags & HX509_CERTS_UNPROTECT_ALL))
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return ret;
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return 0;
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}
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/*
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*
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*/
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static int
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file_init_common(hx509_context context,
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hx509_certs certs, void **data, int flags,
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const char *residue, hx509_lock lock, outformat format)
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{
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char *p, *pnext;
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struct ks_file *f = NULL;
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hx509_private_key *keys = NULL;
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int ret;
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struct pem_ctx pem_ctx;
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pem_ctx.flags = flags;
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pem_ctx.c = NULL;
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*data = NULL;
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if (lock == NULL)
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lock = _hx509_empty_lock;
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f = calloc(1, sizeof(*f));
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if (f == NULL) {
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hx509_clear_error_string(context);
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return ENOMEM;
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}
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f->format = format;
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f->fn = strdup(residue);
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if (f->fn == NULL) {
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hx509_clear_error_string(context);
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ret = ENOMEM;
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goto out;
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}
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/*
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* XXX this is broken, the function should parse the file before
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* overwriting it
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*/
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if (flags & HX509_CERTS_CREATE) {
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ret = hx509_certs_init(context, "MEMORY:ks-file-create",
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0, lock, &f->certs);
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if (ret)
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goto out;
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*data = f;
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return 0;
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}
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ret = _hx509_collector_alloc(context, lock, &pem_ctx.c);
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if (ret)
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goto out;
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for (p = f->fn; p != NULL; p = pnext) {
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FILE *f;
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pnext = strchr(p, ',');
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if (pnext)
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*pnext++ = '\0';
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if ((f = fopen(p, "r")) == NULL) {
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ret = ENOENT;
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hx509_set_error_string(context, 0, ret,
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"Failed to open PEM file \"%s\": %s",
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p, strerror(errno));
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goto out;
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}
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ret = hx509_pem_read(context, f, pem_func, &pem_ctx);
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fclose(f);
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if (ret != 0 && ret != HX509_PARSING_KEY_FAILED)
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goto out;
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else if (ret == HX509_PARSING_KEY_FAILED) {
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size_t length;
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void *ptr;
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int i;
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ret = _hx509_map_file(p, &ptr, &length, NULL);
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if (ret) {
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hx509_clear_error_string(context);
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goto out;
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}
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for (i = 0; i < sizeof(formats)/sizeof(formats[0]); i++) {
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ret = (*formats[i].func)(context, p, pem_ctx.c, NULL, ptr, length);
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if (ret == 0)
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break;
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}
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_hx509_unmap_file(ptr, length);
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if (ret)
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goto out;
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}
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}
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ret = _hx509_collector_collect_certs(context, pem_ctx.c, &f->certs);
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if (ret)
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goto out;
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ret = _hx509_collector_collect_private_keys(context, pem_ctx.c, &keys);
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if (ret == 0) {
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int i;
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for (i = 0; keys[i]; i++)
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_hx509_certs_keys_add(context, f->certs, keys[i]);
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_hx509_certs_keys_free(context, keys);
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}
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out:
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if (ret == 0)
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*data = f;
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else {
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if (f->fn)
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free(f->fn);
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free(f);
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}
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if (pem_ctx.c)
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_hx509_collector_free(pem_ctx.c);
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return ret;
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}
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static int
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file_init_pem(hx509_context context,
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hx509_certs certs, void **data, int flags,
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const char *residue, hx509_lock lock)
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{
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return file_init_common(context, certs, data, flags, residue, lock, USE_PEM);
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}
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static int
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file_init_der(hx509_context context,
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hx509_certs certs, void **data, int flags,
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const char *residue, hx509_lock lock)
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{
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return file_init_common(context, certs, data, flags, residue, lock, USE_DER);
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}
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static int
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file_free(hx509_certs certs, void *data)
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{
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struct ks_file *f = data;
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hx509_certs_free(&f->certs);
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free(f->fn);
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free(f);
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return 0;
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}
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struct store_ctx {
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FILE *f;
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outformat format;
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};
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static int
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store_func(hx509_context context, void *ctx, hx509_cert c)
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{
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struct store_ctx *sc = ctx;
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heim_octet_string data;
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int ret;
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ret = hx509_cert_binary(context, c, &data);
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if (ret)
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return ret;
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switch (sc->format) {
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case USE_DER:
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fwrite(data.data, data.length, 1, sc->f);
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free(data.data);
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break;
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case USE_PEM:
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hx509_pem_write(context, "CERTIFICATE", NULL, sc->f,
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data.data, data.length);
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free(data.data);
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if (_hx509_cert_private_key_exportable(c)) {
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hx509_private_key key = _hx509_cert_private_key(c);
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ret = _hx509_private_key_export(context, key, &data);
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if (ret)
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break;
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hx509_pem_write(context, _hx509_private_pem_name(key), NULL, sc->f,
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data.data, data.length);
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free(data.data);
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}
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break;
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}
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return 0;
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}
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static int
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file_store(hx509_context context,
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hx509_certs certs, void *data, int flags, hx509_lock lock)
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{
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struct ks_file *f = data;
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struct store_ctx sc;
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int ret;
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sc.f = fopen(f->fn, "w");
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if (sc.f == NULL) {
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hx509_set_error_string(context, 0, ENOENT,
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"Failed to open file %s for writing");
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return ENOENT;
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}
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sc.format = f->format;
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ret = hx509_certs_iter(context, f->certs, store_func, &sc);
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fclose(sc.f);
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return ret;
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}
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static int
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file_add(hx509_context context, hx509_certs certs, void *data, hx509_cert c)
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{
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struct ks_file *f = data;
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return hx509_certs_add(context, f->certs, c);
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}
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static int
|
|
file_iter_start(hx509_context context,
|
|
hx509_certs certs, void *data, void **cursor)
|
|
{
|
|
struct ks_file *f = data;
|
|
return hx509_certs_start_seq(context, f->certs, cursor);
|
|
}
|
|
|
|
static int
|
|
file_iter(hx509_context context,
|
|
hx509_certs certs, void *data, void *iter, hx509_cert *cert)
|
|
{
|
|
struct ks_file *f = data;
|
|
return hx509_certs_next_cert(context, f->certs, iter, cert);
|
|
}
|
|
|
|
static int
|
|
file_iter_end(hx509_context context,
|
|
hx509_certs certs,
|
|
void *data,
|
|
void *cursor)
|
|
{
|
|
struct ks_file *f = data;
|
|
return hx509_certs_end_seq(context, f->certs, cursor);
|
|
}
|
|
|
|
static int
|
|
file_getkeys(hx509_context context,
|
|
hx509_certs certs,
|
|
void *data,
|
|
hx509_private_key **keys)
|
|
{
|
|
struct ks_file *f = data;
|
|
return _hx509_certs_keys_get(context, f->certs, keys);
|
|
}
|
|
|
|
static int
|
|
file_addkey(hx509_context context,
|
|
hx509_certs certs,
|
|
void *data,
|
|
hx509_private_key key)
|
|
{
|
|
struct ks_file *f = data;
|
|
return _hx509_certs_keys_add(context, f->certs, key);
|
|
}
|
|
|
|
static struct hx509_keyset_ops keyset_file = {
|
|
"FILE",
|
|
0,
|
|
file_init_pem,
|
|
file_store,
|
|
file_free,
|
|
file_add,
|
|
NULL,
|
|
file_iter_start,
|
|
file_iter,
|
|
file_iter_end,
|
|
NULL,
|
|
file_getkeys,
|
|
file_addkey
|
|
};
|
|
|
|
static struct hx509_keyset_ops keyset_pemfile = {
|
|
"PEM-FILE",
|
|
0,
|
|
file_init_pem,
|
|
file_store,
|
|
file_free,
|
|
file_add,
|
|
NULL,
|
|
file_iter_start,
|
|
file_iter,
|
|
file_iter_end,
|
|
NULL,
|
|
file_getkeys,
|
|
file_addkey
|
|
};
|
|
|
|
static struct hx509_keyset_ops keyset_derfile = {
|
|
"DER-FILE",
|
|
0,
|
|
file_init_der,
|
|
file_store,
|
|
file_free,
|
|
file_add,
|
|
NULL,
|
|
file_iter_start,
|
|
file_iter,
|
|
file_iter_end,
|
|
NULL,
|
|
file_getkeys,
|
|
file_addkey
|
|
};
|
|
|
|
|
|
void
|
|
_hx509_ks_file_register(hx509_context context)
|
|
{
|
|
_hx509_ks_register(context, &keyset_file);
|
|
_hx509_ks_register(context, &keyset_pemfile);
|
|
_hx509_ks_register(context, &keyset_derfile);
|
|
}
|