74a41b918b
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@17391 ec53bebd-3082-4978-b11e-865c3cabbd6b
542 lines
11 KiB
C
542 lines
11 KiB
C
/*
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* Copyright (c) 2005 - 2006 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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};
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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, 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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Certificate t;
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size_t size;
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int ret;
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ret = decode_Certificate(data, len, &t, &size);
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if (ret) {
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hx509_clear_error_string(context);
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return ret;
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}
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ret = hx509_cert_init(context, &t, &cert);
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free_Certificate(&t);
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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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parse_rsa_private_key(hx509_context context, 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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heim_octet_string keydata;
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int ret;
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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 void *password;
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size_t passwordlen;
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void *key;
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const struct _hx509_password *pw;
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hx509_lock lock;
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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, EINVAL,
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"Failed to get password for "
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"password protected file");
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return EINVAL;
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}
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pw = _hx509_lock_get_passwords(lock);
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if (pw == NULL || pw->len < 1) {
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hx509_set_error_string(context, 0, EINVAL,
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"No passwords when decoding a "
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"password protected file");
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return EINVAL;
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}
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password = pw->val[0];
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passwordlen = strlen(password);
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if (strcmp(enc, "4,ENCRYPTED") != 0) {
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hx509_set_error_string(context, 0, EINVAL,
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"RSA key encrypted in unknown method %s",
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enc);
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hx509_clear_error_string(context);
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return EINVAL;
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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, EINVAL,
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"Encrypted RSA missing DEK-Info");
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return EINVAL;
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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)
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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(type);
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free(ivdata);
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hx509_set_error_string(context, 0, EINVAL,
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"RSA key encrypted with "
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"unsupported cipher: %s",
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type);
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return EINVAL;
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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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if (ssize < 0 || ssize < PKCS5_SALT_LEN || ssize < EVP_CIPHER_iv_length(cipher)) {
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free(ivdata);
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free(type);
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hx509_clear_error_string(context);
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return EINVAL;
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}
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key = malloc(EVP_CIPHER_key_length(cipher));
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if (key == NULL) {
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free(type);
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free(ivdata);
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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(cipher, EVP_md5(), ivdata,
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password, passwordlen,
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1, key, NULL);
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free(type);
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if (ret <= 0) {
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free(key);
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free(ivdata);
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hx509_clear_error_string(context);
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return EINVAL;
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}
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keydata.data = malloc(len);
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keydata.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, cipher, NULL, key, ivdata, 0);
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EVP_Cipher(&ctx, keydata.data, data, len);
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EVP_CIPHER_CTX_cleanup(&ctx);
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}
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free(ivdata);
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free(key);
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} else {
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keydata.data = rk_UNCONST(data);
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keydata.length = len;
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}
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ret = _hx509_collector_private_key_add(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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if (keydata.data != data)
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free(keydata.data);
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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, 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 i, 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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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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*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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p = malloc(i);
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i = base64_decode(buf, p);
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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 i;
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ret = EINVAL;
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for (i = 0; i < sizeof(formats)/sizeof(formats[0]); i++) {
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const char *p = formats[i].name;
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if (strncmp(type, p, strlen(p)) == 0)
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ret = (*formats[i].func)(context, c, headers, data, len);
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}
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free(data);
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data = NULL;
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len = 0;
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free(type);
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type = NULL;
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where = BEFORE;
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free_headers(headers);
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headers = NULL;
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if (ret)
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break;
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}
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}
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fclose(f);
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if (where != BEFORE)
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ret = EINVAL;
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if (data)
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free(data);
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if (type)
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free(type);
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if (headers)
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free_headers(headers);
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return ret;
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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(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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char *files = NULL, *p, *pnext;
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int ret;
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struct ks_file *f = NULL;
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struct hx509_collector *c;
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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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c = _hx509_collector_alloc(context, lock);
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if (c == NULL)
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return ENOMEM;
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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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ret = ENOMEM;
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goto out;
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}
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files = strdup(residue);
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if (files == 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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for (p = files; p != NULL; p = pnext) {
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int found_data;
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pnext = strchr(p, ',');
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if (pnext)
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*pnext++ = '\0';
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ret = parse_pem_file(context, p, c, &found_data);
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if (ret)
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goto out;
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if (!found_data) {
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size_t length;
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void *data;
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int ret;
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ret = _hx509_map_file(p, &data, &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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ret = parse_certificate(context, c, NULL, data, length);
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_hx509_unmap_file(data, 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(context, c, &f->certs);
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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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free(f);
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free(files);
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_hx509_collector_free(c);
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return ret;
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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);
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return 0;
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}
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static int
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file_iter_start(hx509_context context,
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hx509_certs certs, void *data, void **cursor)
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{
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struct ks_file *f = data;
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return hx509_certs_start_seq(context, f->certs, cursor);
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}
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static int
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file_iter(hx509_context context,
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hx509_certs certs, void *data, void *iter, hx509_cert *cert)
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{
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struct ks_file *f = data;
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return hx509_certs_next_cert(context, f->certs, iter, cert);
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}
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static int
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file_iter_end(hx509_context context,
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hx509_certs certs,
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void *data,
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void *cursor)
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{
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struct ks_file *f = data;
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return hx509_certs_end_seq(context, f->certs, cursor);
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}
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static struct hx509_keyset_ops keyset_file = {
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"FILE",
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0,
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file_init,
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file_free,
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NULL,
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NULL,
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file_iter_start,
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file_iter,
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file_iter_end
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};
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void
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_hx509_ks_file_register(hx509_context context)
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{
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_hx509_ks_register(context, &keyset_file);
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}
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