b442dada5d
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@21306 ec53bebd-3082-4978-b11e-865c3cabbd6b
741 lines
16 KiB
C
741 lines
16 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("$Id$");
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struct ks_file {
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hx509_certs certs;
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char *fn;
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};
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struct header {
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char *header;
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char *value;
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struct header *next;
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};
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static int
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add_headers(struct header **headers, const char *header, const char *value)
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{
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struct header *h;
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h = calloc(1, sizeof(*h));
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if (h == NULL)
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return ENOMEM;
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h->header = strdup(header);
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if (h->header == NULL) {
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free(h);
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return ENOMEM;
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}
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h->value = strdup(value);
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if (h->value == NULL) {
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free(h->header);
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free(h);
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return ENOMEM;
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}
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h->next = *headers;
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*headers = h;
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return 0;
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}
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static void
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free_headers(struct header *headers)
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{
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struct header *h;
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while (headers) {
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h = headers;
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headers = headers->next;
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free(h->header);
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free(h->value);
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free(h);
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}
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}
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static const char *
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find_header(const struct header *headers, const char *header)
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{
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while(headers) {
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if (strcmp(header, headers->header) == 0)
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return headers->value;
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headers = headers->next;
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}
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return NULL;
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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 struct 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 struct 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 = 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 = 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 struct 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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static int
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parse_pem_file(hx509_context context,
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const char *fn,
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struct hx509_collector *c,
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int *found_data)
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{
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struct header *headers = NULL;
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char *type = NULL;
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void *data = NULL;
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size_t len = 0;
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char buf[1024];
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int ret;
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FILE *f;
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enum { BEFORE, SEARCHHEADER, INHEADER, INDATA, DONE } where;
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where = BEFORE;
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*found_data = 0;
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if ((f = fopen(fn, "r")) == NULL) {
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hx509_set_error_string(context, 0, ENOENT,
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"Failed to open PEM file \"%s\": %s",
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fn, strerror(errno));
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return ENOENT;
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}
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ret = 0;
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while (fgets(buf, sizeof(buf), f) != NULL) {
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char *p;
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int i;
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i = strcspn(buf, "\n");
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if (buf[i] == '\n') {
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buf[i] = '\0';
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if (i > 0)
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i--;
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}
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if (buf[i] == '\r') {
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buf[i] = '\0';
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if (i > 0)
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i--;
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}
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switch (where) {
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case BEFORE:
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if (strncmp("-----BEGIN ", buf, 11) == 0) {
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type = strdup(buf + 11);
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if (type == NULL)
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break;
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p = strchr(type, '-');
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if (p)
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*p = '\0';
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*found_data = 1;
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where = SEARCHHEADER;
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}
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break;
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case SEARCHHEADER:
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p = strchr(buf, ':');
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if (p == NULL) {
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where = INDATA;
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goto indata;
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}
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/* FALLTHOUGH */
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case INHEADER:
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if (buf[0] == '\0') {
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where = INDATA;
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break;
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}
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p = strchr(buf, ':');
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if (p) {
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*p++ = '\0';
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while (isspace((int)*p))
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p++;
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add_headers(&headers, buf, p);
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}
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break;
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case INDATA:
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indata:
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if (strncmp("-----END ", buf, 9) == 0) {
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where = DONE;
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break;
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}
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|
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p = emalloc(i);
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i = base64_decode(buf, p);
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if (i < 0) {
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free(p);
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goto out;
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}
|
|
|
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data = erealloc(data, len + i);
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memcpy(((char *)data) + len, p, i);
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free(p);
|
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len += i;
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break;
|
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case DONE:
|
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abort();
|
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}
|
|
|
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if (where == DONE) {
|
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int 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, fn, c,
|
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headers, data, len);
|
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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",
|
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type);
|
|
}
|
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out:
|
|
free(data);
|
|
data = NULL;
|
|
len = 0;
|
|
free(type);
|
|
type = NULL;
|
|
where = BEFORE;
|
|
free_headers(headers);
|
|
headers = NULL;
|
|
if (ret)
|
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break;
|
|
}
|
|
}
|
|
|
|
fclose(f);
|
|
|
|
if (where != BEFORE) {
|
|
hx509_set_error_string(context, 0, HX509_PARSING_KEY_FAILED,
|
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"File ends before end of PEM end tag");
|
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ret = HX509_PARSING_KEY_FAILED;
|
|
}
|
|
if (data)
|
|
free(data);
|
|
if (type)
|
|
free(type);
|
|
if (headers)
|
|
free_headers(headers);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
*
|
|
*/
|
|
|
|
static int
|
|
file_init(hx509_context context,
|
|
hx509_certs certs, void **data, int flags,
|
|
const char *residue, hx509_lock lock)
|
|
{
|
|
char *p, *pnext;
|
|
struct ks_file *f = NULL;
|
|
struct hx509_collector *c = NULL;
|
|
hx509_private_key *keys = NULL;
|
|
int ret;
|
|
|
|
*data = NULL;
|
|
|
|
if (lock == NULL)
|
|
lock = _hx509_empty_lock;
|
|
|
|
f = calloc(1, sizeof(*f));
|
|
if (f == NULL) {
|
|
hx509_clear_error_string(context);
|
|
return ENOMEM;
|
|
}
|
|
|
|
f->fn = strdup(residue);
|
|
if (f->fn == NULL) {
|
|
hx509_clear_error_string(context);
|
|
ret = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* XXX this is broken, the function should parse the file before
|
|
* overwriting it
|
|
*/
|
|
|
|
if (flags & HX509_CERTS_CREATE) {
|
|
ret = hx509_certs_init(context, "MEMORY:ks-file-create",
|
|
0, lock, &f->certs);
|
|
if (ret)
|
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goto out;
|
|
*data = f;
|
|
return 0;
|
|
}
|
|
|
|
ret = _hx509_collector_alloc(context, lock, &c);
|
|
if (ret)
|
|
goto out;
|
|
|
|
for (p = f->fn; p != NULL; p = pnext) {
|
|
int found_data;
|
|
|
|
pnext = strchr(p, ',');
|
|
if (pnext)
|
|
*pnext++ = '\0';
|
|
|
|
ret = parse_pem_file(context, p, c, &found_data);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (!found_data) {
|
|
size_t length;
|
|
void *ptr;
|
|
int i;
|
|
|
|
ret = _hx509_map_file(p, &ptr, &length, NULL);
|
|
if (ret) {
|
|
hx509_clear_error_string(context);
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < sizeof(formats)/sizeof(formats[0]); i++) {
|
|
ret = (*formats[i].func)(context, p, c, NULL, ptr, length);
|
|
if (ret == 0)
|
|
break;
|
|
}
|
|
_hx509_unmap_file(ptr, length);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = _hx509_collector_collect_certs(context, c, &f->certs);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = _hx509_collector_collect_private_keys(context, c, &keys);
|
|
if (ret == 0) {
|
|
int i;
|
|
|
|
for (i = 0; keys[i]; i++)
|
|
_hx509_certs_keys_add(context, f->certs, keys[i]);
|
|
_hx509_certs_keys_free(context, keys);
|
|
}
|
|
|
|
out:
|
|
if (ret == 0)
|
|
*data = f;
|
|
else {
|
|
if (f->fn)
|
|
free(f->fn);
|
|
free(f);
|
|
}
|
|
if (c)
|
|
_hx509_collector_free(c);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
file_free(hx509_certs certs, void *data)
|
|
{
|
|
struct ks_file *f = data;
|
|
hx509_certs_free(&f->certs);
|
|
free(f->fn);
|
|
free(f);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
store_private_key(hx509_context context, FILE *f, hx509_private_key key)
|
|
{
|
|
heim_octet_string data;
|
|
int ret;
|
|
|
|
ret = _hx509_private_key_export(context, key, &data);
|
|
if (ret == 0)
|
|
hx509_pem_write(context, _hx509_private_pem_name(key), NULL, f,
|
|
data.data, data.length);
|
|
free(data.data);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
store_func(hx509_context context, void *ctx, hx509_cert c)
|
|
{
|
|
FILE *f = (FILE *)ctx;
|
|
heim_octet_string data;
|
|
int ret;
|
|
|
|
ret = hx509_cert_binary(context, c, &data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
hx509_pem_write(context, "CERTIFICATE", NULL, f, data.data, data.length);
|
|
free(data.data);
|
|
|
|
if (_hx509_cert_private_key_exportable(c))
|
|
store_private_key(context, f, _hx509_cert_private_key(c));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
file_store(hx509_context context,
|
|
hx509_certs certs, void *data, int flags, hx509_lock lock)
|
|
{
|
|
struct ks_file *f = data;
|
|
FILE *fh;
|
|
int ret;
|
|
|
|
fh = fopen(f->fn, "w");
|
|
if (fh == NULL) {
|
|
hx509_set_error_string(context, 0, ENOENT,
|
|
"Failed to open file %s for writing");
|
|
return ENOENT;
|
|
}
|
|
|
|
ret = hx509_certs_iter(context, f->certs, store_func, fh);
|
|
fclose(fh);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
file_add(hx509_context context, hx509_certs certs, void *data, hx509_cert c)
|
|
{
|
|
struct ks_file *f = data;
|
|
return hx509_certs_add(context, f->certs, c);
|
|
}
|
|
|
|
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,
|
|
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);
|
|
}
|