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| Current File : //usr/src/crypto/heimdal/lib/hx509/ks_file.c |
/*
* Copyright (c) 2005 - 2007 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "hx_locl.h"
RCSID("$Id: ks_file.c 22465 2008-01-16 14:25:24Z lha $");
typedef enum { USE_PEM, USE_DER } outformat;
struct ks_file {
hx509_certs certs;
char *fn;
outformat format;
};
/*
*
*/
static int
parse_certificate(hx509_context context, const char *fn,
struct hx509_collector *c,
const hx509_pem_header *headers,
const void *data, size_t len)
{
hx509_cert cert;
int ret;
ret = hx509_cert_init_data(context, data, len, &cert);
if (ret)
return ret;
ret = _hx509_collector_certs_add(context, c, cert);
hx509_cert_free(cert);
return ret;
}
static int
try_decrypt(hx509_context context,
struct hx509_collector *collector,
const AlgorithmIdentifier *alg,
const EVP_CIPHER *c,
const void *ivdata,
const void *password,
size_t passwordlen,
const void *cipher,
size_t len)
{
heim_octet_string clear;
size_t keylen;
void *key;
int ret;
keylen = EVP_CIPHER_key_length(c);
key = malloc(keylen);
if (key == NULL) {
hx509_clear_error_string(context);
return ENOMEM;
}
ret = EVP_BytesToKey(c, EVP_md5(), ivdata,
password, passwordlen,
1, key, NULL);
if (ret <= 0) {
hx509_set_error_string(context, 0, HX509_CRYPTO_INTERNAL_ERROR,
"Failed to do string2key for private key");
return HX509_CRYPTO_INTERNAL_ERROR;
}
clear.data = malloc(len);
if (clear.data == NULL) {
hx509_set_error_string(context, 0, ENOMEM,
"Out of memory to decrypt for private key");
ret = ENOMEM;
goto out;
}
clear.length = len;
{
EVP_CIPHER_CTX ctx;
EVP_CIPHER_CTX_init(&ctx);
EVP_CipherInit_ex(&ctx, c, NULL, key, ivdata, 0);
EVP_Cipher(&ctx, clear.data, cipher, len);
EVP_CIPHER_CTX_cleanup(&ctx);
}
ret = _hx509_collector_private_key_add(context,
collector,
alg,
NULL,
&clear,
NULL);
memset(clear.data, 0, clear.length);
free(clear.data);
out:
memset(key, 0, keylen);
free(key);
return ret;
}
static int
parse_rsa_private_key(hx509_context context, const char *fn,
struct hx509_collector *c,
const hx509_pem_header *headers,
const void *data, size_t len)
{
int ret = 0;
const char *enc;
enc = hx509_pem_find_header(headers, "Proc-Type");
if (enc) {
const char *dek;
char *type, *iv;
ssize_t ssize, size;
void *ivdata;
const EVP_CIPHER *cipher;
const struct _hx509_password *pw;
hx509_lock lock;
int i, decrypted = 0;
lock = _hx509_collector_get_lock(c);
if (lock == NULL) {
hx509_set_error_string(context, 0, HX509_ALG_NOT_SUPP,
"Failed to get password for "
"password protected file %s", fn);
return HX509_ALG_NOT_SUPP;
}
if (strcmp(enc, "4,ENCRYPTED") != 0) {
hx509_set_error_string(context, 0, HX509_PARSING_KEY_FAILED,
"RSA key encrypted in unknown method %s "
"in file",
enc, fn);
hx509_clear_error_string(context);
return HX509_PARSING_KEY_FAILED;
}
dek = hx509_pem_find_header(headers, "DEK-Info");
if (dek == NULL) {
hx509_set_error_string(context, 0, HX509_PARSING_KEY_FAILED,
"Encrypted RSA missing DEK-Info");
return HX509_PARSING_KEY_FAILED;
}
type = strdup(dek);
if (type == NULL) {
hx509_clear_error_string(context);
return ENOMEM;
}
iv = strchr(type, ',');
if (iv == NULL) {
free(type);
hx509_set_error_string(context, 0, HX509_PARSING_KEY_FAILED,
"IV missing");
return HX509_PARSING_KEY_FAILED;
}
*iv++ = '\0';
size = strlen(iv);
ivdata = malloc(size);
if (ivdata == NULL) {
hx509_clear_error_string(context);
free(type);
return ENOMEM;
}
cipher = EVP_get_cipherbyname(type);
if (cipher == NULL) {
free(ivdata);
hx509_set_error_string(context, 0, HX509_ALG_NOT_SUPP,
"RSA key encrypted with "
"unsupported cipher: %s",
type);
free(type);
return HX509_ALG_NOT_SUPP;
}
#define PKCS5_SALT_LEN 8
ssize = hex_decode(iv, ivdata, size);
free(type);
type = NULL;
iv = NULL;
if (ssize < 0 || ssize < PKCS5_SALT_LEN || ssize < EVP_CIPHER_iv_length(cipher)) {
free(ivdata);
hx509_set_error_string(context, 0, HX509_PARSING_KEY_FAILED,
"Salt have wrong length in RSA key file");
return HX509_PARSING_KEY_FAILED;
}
pw = _hx509_lock_get_passwords(lock);
if (pw != NULL) {
const void *password;
size_t passwordlen;
for (i = 0; i < pw->len; i++) {
password = pw->val[i];
passwordlen = strlen(password);
ret = try_decrypt(context, c, hx509_signature_rsa(),
cipher, ivdata, password, passwordlen,
data, len);
if (ret == 0) {
decrypted = 1;
break;
}
}
}
if (!decrypted) {
hx509_prompt prompt;
char password[128];
memset(&prompt, 0, sizeof(prompt));
prompt.prompt = "Password for keyfile: ";
prompt.type = HX509_PROMPT_TYPE_PASSWORD;
prompt.reply.data = password;
prompt.reply.length = sizeof(password);
ret = hx509_lock_prompt(lock, &prompt);
if (ret == 0)
ret = try_decrypt(context, c, hx509_signature_rsa(),
cipher, ivdata, password, strlen(password),
data, len);
/* XXX add password to lock password collection ? */
memset(password, 0, sizeof(password));
}
free(ivdata);
} else {
heim_octet_string keydata;
keydata.data = rk_UNCONST(data);
keydata.length = len;
ret = _hx509_collector_private_key_add(context,
c,
hx509_signature_rsa(),
NULL,
&keydata,
NULL);
}
return ret;
}
struct pem_formats {
const char *name;
int (*func)(hx509_context, const char *, struct hx509_collector *,
const hx509_pem_header *, const void *, size_t);
} formats[] = {
{ "CERTIFICATE", parse_certificate },
{ "RSA PRIVATE KEY", parse_rsa_private_key }
};
struct pem_ctx {
int flags;
struct hx509_collector *c;
};
static int
pem_func(hx509_context context, const char *type,
const hx509_pem_header *header,
const void *data, size_t len, void *ctx)
{
struct pem_ctx *pem_ctx = (struct pem_ctx*)ctx;
int ret = 0, j;
for (j = 0; j < sizeof(formats)/sizeof(formats[0]); j++) {
const char *q = formats[j].name;
if (strcasecmp(type, q) == 0) {
ret = (*formats[j].func)(context, NULL, pem_ctx->c, header, data, len);
if (ret == 0)
break;
}
}
if (j == sizeof(formats)/sizeof(formats[0])) {
ret = HX509_UNSUPPORTED_OPERATION;
hx509_set_error_string(context, 0, ret,
"Found no matching PEM format for %s", type);
return ret;
}
if (ret && (pem_ctx->flags & HX509_CERTS_UNPROTECT_ALL))
return ret;
return 0;
}
/*
*
*/
static int
file_init_common(hx509_context context,
hx509_certs certs, void **data, int flags,
const char *residue, hx509_lock lock, outformat format)
{
char *p, *pnext;
struct ks_file *f = NULL;
hx509_private_key *keys = NULL;
int ret;
struct pem_ctx pem_ctx;
pem_ctx.flags = flags;
pem_ctx.c = NULL;
*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->format = format;
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)
goto out;
*data = f;
return 0;
}
ret = _hx509_collector_alloc(context, lock, &pem_ctx.c);
if (ret)
goto out;
for (p = f->fn; p != NULL; p = pnext) {
FILE *f;
pnext = strchr(p, ',');
if (pnext)
*pnext++ = '\0';
if ((f = fopen(p, "r")) == NULL) {
ret = ENOENT;
hx509_set_error_string(context, 0, ret,
"Failed to open PEM file \"%s\": %s",
p, strerror(errno));
goto out;
}
ret = hx509_pem_read(context, f, pem_func, &pem_ctx);
fclose(f);
if (ret != 0 && ret != HX509_PARSING_KEY_FAILED)
goto out;
else if (ret == HX509_PARSING_KEY_FAILED) {
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, pem_ctx.c, NULL, ptr, length);
if (ret == 0)
break;
}
_hx509_unmap_file(ptr, length);
if (ret)
goto out;
}
}
ret = _hx509_collector_collect_certs(context, pem_ctx.c, &f->certs);
if (ret)
goto out;
ret = _hx509_collector_collect_private_keys(context, pem_ctx.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 (pem_ctx.c)
_hx509_collector_free(pem_ctx.c);
return ret;
}
static int
file_init_pem(hx509_context context,
hx509_certs certs, void **data, int flags,
const char *residue, hx509_lock lock)
{
return file_init_common(context, certs, data, flags, residue, lock, USE_PEM);
}
static int
file_init_der(hx509_context context,
hx509_certs certs, void **data, int flags,
const char *residue, hx509_lock lock)
{
return file_init_common(context, certs, data, flags, residue, lock, USE_DER);
}
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;
}
struct store_ctx {
FILE *f;
outformat format;
};
static int
store_func(hx509_context context, void *ctx, hx509_cert c)
{
struct store_ctx *sc = ctx;
heim_octet_string data;
int ret;
ret = hx509_cert_binary(context, c, &data);
if (ret)
return ret;
switch (sc->format) {
case USE_DER:
fwrite(data.data, data.length, 1, sc->f);
free(data.data);
break;
case USE_PEM:
hx509_pem_write(context, "CERTIFICATE", NULL, sc->f,
data.data, data.length);
free(data.data);
if (_hx509_cert_private_key_exportable(c)) {
hx509_private_key key = _hx509_cert_private_key(c);
ret = _hx509_private_key_export(context, key, &data);
if (ret)
break;
hx509_pem_write(context, _hx509_private_pem_name(key), NULL, sc->f,
data.data, data.length);
free(data.data);
}
break;
}
return 0;
}
static int
file_store(hx509_context context,
hx509_certs certs, void *data, int flags, hx509_lock lock)
{
struct ks_file *f = data;
struct store_ctx sc;
int ret;
sc.f = fopen(f->fn, "w");
if (sc.f == NULL) {
hx509_set_error_string(context, 0, ENOENT,
"Failed to open file %s for writing");
return ENOENT;
}
sc.format = f->format;
ret = hx509_certs_iter(context, f->certs, store_func, &sc);
fclose(sc.f);
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_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);
}