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|
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/*
* Dan Williams <dcbw@redhat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*
* Copyright 2007 - 2011 Red Hat, Inc.
*/
#include "config.h"
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <stdlib.h>
#include <glib/gi18n-lib.h>
#include "nm-default.h"
#include "crypto.h"
GQuark
_nm_crypto_error_quark (void)
{
static GQuark quark;
if (G_UNLIKELY (!quark))
quark = g_quark_from_static_string ("nm-crypto-error-quark");
return quark;
}
#define PEM_RSA_KEY_BEGIN "-----BEGIN RSA PRIVATE KEY-----"
#define PEM_RSA_KEY_END "-----END RSA PRIVATE KEY-----"
#define PEM_DSA_KEY_BEGIN "-----BEGIN DSA PRIVATE KEY-----"
#define PEM_DSA_KEY_END "-----END DSA PRIVATE KEY-----"
#define PEM_CERT_BEGIN "-----BEGIN CERTIFICATE-----"
#define PEM_CERT_END "-----END CERTIFICATE-----"
#define PEM_PKCS8_ENC_KEY_BEGIN "-----BEGIN ENCRYPTED PRIVATE KEY-----"
#define PEM_PKCS8_ENC_KEY_END "-----END ENCRYPTED PRIVATE KEY-----"
#define PEM_PKCS8_DEC_KEY_BEGIN "-----BEGIN PRIVATE KEY-----"
#define PEM_PKCS8_DEC_KEY_END "-----END PRIVATE KEY-----"
static gboolean
find_tag (const char *tag,
const GByteArray *array,
gsize start_at,
gsize *out_pos)
{
gsize i, taglen;
gsize len = array->len - start_at;
g_return_val_if_fail (out_pos != NULL, FALSE);
taglen = strlen (tag);
if (len >= taglen) {
for (i = 0; i < len - taglen + 1; i++) {
if (memcmp (array->data + start_at + i, tag, taglen) == 0) {
*out_pos = start_at + i;
return TRUE;
}
}
}
return FALSE;
}
#define DEK_INFO_TAG "DEK-Info: "
#define PROC_TYPE_TAG "Proc-Type: "
static GByteArray *
parse_old_openssl_key_file (const GByteArray *contents,
int key_type,
char **out_cipher,
char **out_iv,
GError **error)
{
GByteArray *bindata = NULL;
char **lines = NULL;
char **ln = NULL;
gsize start = 0, end = 0;
GString *str = NULL;
int enc_tags = 0;
char *iv = NULL;
char *cipher = NULL;
unsigned char *tmp = NULL;
gsize tmp_len = 0;
const char *start_tag;
const char *end_tag;
guint8 save_end = 0;
switch (key_type) {
case NM_CRYPTO_KEY_TYPE_RSA:
start_tag = PEM_RSA_KEY_BEGIN;
end_tag = PEM_RSA_KEY_END;
break;
case NM_CRYPTO_KEY_TYPE_DSA:
start_tag = PEM_DSA_KEY_BEGIN;
end_tag = PEM_DSA_KEY_END;
break;
default:
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_UNKNOWN_KEY_TYPE,
"Unknown key type %d",
key_type);
g_assert_not_reached ();
return NULL;
}
if (!find_tag (start_tag, contents, 0, &start))
goto parse_error;
start += strlen (start_tag);
if (!find_tag (end_tag, contents, start, &end)) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
_("PEM key file had no end tag '%s'."),
end_tag);
goto parse_error;
}
save_end = contents->data[end];
contents->data[end] = '\0';
lines = g_strsplit ((const char *) (contents->data + start), "\n", 0);
contents->data[end] = save_end;
if (!lines || g_strv_length (lines) <= 1) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
_("Doesn't look like a PEM private key file."));
goto parse_error;
}
str = g_string_new_len (NULL, end - start);
for (ln = lines; *ln; ln++) {
char *p = *ln;
/* Chug leading spaces */
p = g_strstrip (p);
if (!*p)
continue;
if (!strncmp (p, PROC_TYPE_TAG, strlen (PROC_TYPE_TAG))) {
if (enc_tags++ != 0) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
_("Malformed PEM file: Proc-Type was not first tag."));
goto parse_error;
}
p += strlen (PROC_TYPE_TAG);
if (strcmp (p, "4,ENCRYPTED")) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
_("Malformed PEM file: unknown Proc-Type tag '%s'."),
p);
goto parse_error;
}
} else if (!strncmp (p, DEK_INFO_TAG, strlen (DEK_INFO_TAG))) {
char *comma;
if (enc_tags++ != 1) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
_("Malformed PEM file: DEK-Info was not the second tag."));
goto parse_error;
}
p += strlen (DEK_INFO_TAG);
/* Grab the IV first */
comma = strchr (p, ',');
if (!comma || (*(comma + 1) == '\0')) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
_("Malformed PEM file: no IV found in DEK-Info tag."));
goto parse_error;
}
*comma++ = '\0';
if (!g_ascii_isxdigit (*comma)) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
_("Malformed PEM file: invalid format of IV in DEK-Info tag."));
goto parse_error;
}
iv = g_strdup (comma);
/* Get the private key cipher */
if (!strcasecmp (p, "DES-EDE3-CBC")) {
cipher = g_strdup (p);
} else if (!strcasecmp (p, "DES-CBC")) {
cipher = g_strdup (p);
} else if (!strcasecmp (p, "AES-128-CBC")) {
cipher = g_strdup (p);
} else {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_UNKNOWN_KEY_TYPE,
_("Malformed PEM file: unknown private key cipher '%s'."),
p);
goto parse_error;
}
} else {
if ((enc_tags != 0) && (enc_tags != 2)) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
"Malformed PEM file: both Proc-Type and DEK-Info tags are required.");
goto parse_error;
}
g_string_append (str, p);
}
}
tmp = g_base64_decode (str->str, &tmp_len);
if (tmp == NULL || !tmp_len) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_DECODE_FAILED,
_("Could not decode private key."));
goto parse_error;
}
g_string_free (str, TRUE);
if (lines)
g_strfreev (lines);
bindata = g_byte_array_sized_new (tmp_len);
g_byte_array_append (bindata, tmp, tmp_len);
g_free (tmp);
*out_iv = iv;
*out_cipher = cipher;
return bindata;
parse_error:
g_free (tmp);
g_free (cipher);
g_free (iv);
if (str)
g_string_free (str, TRUE);
if (lines)
g_strfreev (lines);
return NULL;
}
static GByteArray *
parse_pkcs8_key_file (const GByteArray *contents,
gboolean *out_encrypted,
GError **error)
{
GByteArray *key = NULL;
gsize start = 0, end = 0;
unsigned char *der = NULL;
guint8 save_end;
gsize length = 0;
const char *start_tag = NULL, *end_tag = NULL;
gboolean encrypted = FALSE;
/* Try encrypted first, decrypted next */
if (find_tag (PEM_PKCS8_ENC_KEY_BEGIN, contents, 0, &start)) {
start_tag = PEM_PKCS8_ENC_KEY_BEGIN;
end_tag = PEM_PKCS8_ENC_KEY_END;
encrypted = TRUE;
} else if (find_tag (PEM_PKCS8_DEC_KEY_BEGIN, contents, 0, &start)) {
start_tag = PEM_PKCS8_DEC_KEY_BEGIN;
end_tag = PEM_PKCS8_DEC_KEY_END;
encrypted = FALSE;
} else {
g_set_error_literal (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
_("Failed to find expected PKCS#8 start tag."));
return NULL;
}
start += strlen (start_tag);
if (!find_tag (end_tag, contents, start, &end)) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
_("Failed to find expected PKCS#8 end tag '%s'."),
end_tag);
return NULL;
}
/* g_base64_decode() wants a NULL-terminated string */
save_end = contents->data[end];
contents->data[end] = '\0';
der = g_base64_decode ((const char *) (contents->data + start), &length);
contents->data[end] = save_end;
if (der && length) {
key = g_byte_array_sized_new (length);
g_byte_array_append (key, der, length);
g_assert (key->len == length);
*out_encrypted = encrypted;
} else {
g_set_error_literal (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_DECODE_FAILED,
_("Failed to decode PKCS#8 private key."));
}
g_free (der);
return key;
}
static GByteArray *
file_to_g_byte_array (const char *filename, GError **error)
{
char *contents;
GByteArray *array = NULL;
gsize length = 0;
if (g_file_get_contents (filename, &contents, &length, error)) {
array = g_byte_array_sized_new (length);
g_byte_array_append (array, (guint8 *) contents, length);
g_assert (array->len == length);
g_free (contents);
}
return array;
}
/*
* Convert a hex string into bytes.
*/
static char *
convert_iv (const char *src,
gsize *out_len,
GError **error)
{
int num;
int i;
char conv[3];
char *c;
g_return_val_if_fail (src != NULL, NULL);
num = strlen (src);
if (num % 2) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_RAW_IV_INVALID,
_("IV must be an even number of bytes in length."));
return NULL;
}
num /= 2;
c = g_malloc0 (num + 1);
conv[2] = '\0';
for (i = 0; i < num; i++) {
conv[0] = src[(i * 2)];
conv[1] = src[(i * 2) + 1];
if (!g_ascii_isxdigit (conv[0]) || !g_ascii_isxdigit (conv[1])) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_RAW_IV_INVALID,
_("IV contains non-hexadecimal digits."));
goto error;
}
c[i] = strtol(conv, NULL, 16);
}
*out_len = num;
return c;
error:
g_free (c);
return NULL;
}
static char *
make_des_aes_key (const char *cipher,
const char *salt,
const gsize salt_len,
const char *password,
gsize *out_len,
GError **error)
{
char *key;
guint32 digest_len;
g_return_val_if_fail (cipher != NULL, NULL);
g_return_val_if_fail (salt != NULL, NULL);
g_return_val_if_fail (salt_len >= 8, NULL);
g_return_val_if_fail (password != NULL, NULL);
g_return_val_if_fail (out_len != NULL, NULL);
if (!strcmp (cipher, "DES-EDE3-CBC"))
digest_len = 24;
else if (!strcmp (cipher, "DES-CBC"))
digest_len = 8;
else if (!strcmp (cipher, "AES-128-CBC"))
digest_len = 16;
else {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_UNKNOWN_CIPHER,
_("Private key cipher '%s' was unknown."),
cipher);
return NULL;
}
if (password[0] == '\0')
return NULL;
key = g_malloc0 (digest_len + 1);
if (!crypto_md5_hash (salt,
salt_len,
password,
strlen (password),
key,
digest_len,
error))
goto error;
*out_len = digest_len;
return key;
error:
if (key) {
/* Don't leak stale key material */
memset (key, 0, digest_len);
g_free (key);
}
return NULL;
}
static GByteArray *
decrypt_key (const char *cipher,
int key_type,
GByteArray *data,
const char *iv,
const char *password,
GError **error)
{
char *bin_iv = NULL;
gsize bin_iv_len = 0;
char *key = NULL;
gsize key_len = 0;
char *output = NULL;
gsize decrypted_len = 0;
GByteArray *decrypted = NULL;
g_return_val_if_fail (password != NULL, NULL);
bin_iv = convert_iv (iv, &bin_iv_len, error);
if (!bin_iv)
return NULL;
/* Convert the password and IV into a DES or AES key */
key = make_des_aes_key (cipher, bin_iv, bin_iv_len, password, &key_len, error);
if (!key || !key_len)
goto out;
output = crypto_decrypt (cipher, key_type,
data,
bin_iv, bin_iv_len,
key, key_len,
&decrypted_len,
error);
if (output && decrypted_len) {
decrypted = g_byte_array_sized_new (decrypted_len);
g_byte_array_append (decrypted, (guint8 *) output, decrypted_len);
}
out:
/* Don't leak stale key material */
if (key)
memset (key, 0, key_len);
g_free (output);
g_free (key);
g_free (bin_iv);
return decrypted;
}
GByteArray *
crypto_decrypt_private_key_data (const GByteArray *contents,
const char *password,
NMCryptoKeyType *out_key_type,
GError **error)
{
GByteArray *decrypted = NULL;
NMCryptoKeyType key_type = NM_CRYPTO_KEY_TYPE_RSA;
GByteArray *data;
char *iv = NULL;
char *cipher = NULL;
g_return_val_if_fail (contents != NULL, NULL);
if (out_key_type)
g_return_val_if_fail (*out_key_type == NM_CRYPTO_KEY_TYPE_UNKNOWN, NULL);
/* OpenSSL non-standard legacy PEM files */
/* Try RSA keys first */
data = parse_old_openssl_key_file (contents, key_type, &cipher, &iv, error);
if (!data) {
g_clear_error (error);
/* DSA next */
key_type = NM_CRYPTO_KEY_TYPE_DSA;
data = parse_old_openssl_key_file (contents, key_type, &cipher, &iv, error);
if (!data) {
g_clear_error (error);
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
_("Unable to determine private key type."));
}
}
if (data) {
/* return the key type even if decryption failed */
if (out_key_type)
*out_key_type = key_type;
if (password) {
decrypted = decrypt_key (cipher,
key_type,
data,
iv,
password,
error);
}
g_byte_array_free (data, TRUE);
}
g_free (cipher);
g_free (iv);
return decrypted;
}
GByteArray *
crypto_decrypt_private_key (const char *file,
const char *password,
NMCryptoKeyType *out_key_type,
GError **error)
{
GByteArray *contents;
GByteArray *key = NULL;
contents = file_to_g_byte_array (file, error);
if (contents) {
key = crypto_decrypt_private_key_data (contents, password, out_key_type, error);
g_byte_array_free (contents, TRUE);
}
return key;
}
static GByteArray *
extract_pem_cert_data (GByteArray *contents, GError **error)
{
GByteArray *cert = NULL;
gsize start = 0, end = 0;
unsigned char *der = NULL;
guint8 save_end;
gsize length = 0;
if (!find_tag (PEM_CERT_BEGIN, contents, 0, &start)) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
_("PEM certificate had no start tag '%s'."),
PEM_CERT_BEGIN);
goto done;
}
start += strlen (PEM_CERT_BEGIN);
if (!find_tag (PEM_CERT_END, contents, start, &end)) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
_("PEM certificate had no end tag '%s'."),
PEM_CERT_END);
goto done;
}
/* g_base64_decode() wants a NULL-terminated string */
save_end = contents->data[end];
contents->data[end] = '\0';
der = g_base64_decode ((const char *) (contents->data + start), &length);
contents->data[end] = save_end;
if (der && length) {
cert = g_byte_array_sized_new (length);
g_byte_array_append (cert, der, length);
g_assert (cert->len == length);
} else {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_DECODE_FAILED,
_("Failed to decode certificate."));
}
done:
g_free (der);
return cert;
}
GByteArray *
crypto_load_and_verify_certificate (const char *file,
NMCryptoFileFormat *out_file_format,
GError **error)
{
GByteArray *array, *contents;
g_return_val_if_fail (file != NULL, NULL);
g_return_val_if_fail (out_file_format != NULL, NULL);
g_return_val_if_fail (*out_file_format == NM_CRYPTO_FILE_FORMAT_UNKNOWN, NULL);
contents = file_to_g_byte_array (file, error);
if (!contents)
return NULL;
/* Check for PKCS#12 */
if (crypto_is_pkcs12_data (contents)) {
*out_file_format = NM_CRYPTO_FILE_FORMAT_PKCS12;
return contents;
}
/* Check for plain DER format */
if (contents->len > 2 && contents->data[0] == 0x30 && contents->data[1] == 0x82) {
*out_file_format = crypto_verify_cert (contents->data, contents->len, error);
} else {
array = extract_pem_cert_data (contents, error);
if (!array) {
g_byte_array_free (contents, TRUE);
return NULL;
}
*out_file_format = crypto_verify_cert (array->data, array->len, error);
g_byte_array_free (array, TRUE);
}
if (*out_file_format != NM_CRYPTO_FILE_FORMAT_X509) {
g_byte_array_free (contents, TRUE);
contents = NULL;
}
return contents;
}
gboolean
crypto_is_pkcs12_data (const GByteArray *data)
{
GError *error = NULL;
gboolean success;
g_return_val_if_fail (data != NULL, FALSE);
success = crypto_verify_pkcs12 (data, NULL, &error);
if (success == FALSE) {
/* If the error was just a decryption error, then it's pkcs#12 */
if (error) {
if (g_error_matches (error, NM_CRYPTO_ERROR, NM_CRYPTO_ERR_CIPHER_DECRYPT_FAILED))
success = TRUE;
g_error_free (error);
}
}
return success;
}
gboolean
crypto_is_pkcs12_file (const char *file, GError **error)
{
GByteArray *contents;
gboolean success = FALSE;
g_return_val_if_fail (file != NULL, FALSE);
contents = file_to_g_byte_array (file, error);
if (contents) {
success = crypto_is_pkcs12_data (contents);
g_byte_array_free (contents, TRUE);
}
return success;
}
/* Verifies that a private key can be read, and if a password is given, that
* the private key can be decrypted with that password.
*/
NMCryptoFileFormat
crypto_verify_private_key_data (const GByteArray *contents,
const char *password,
GError **error)
{
GByteArray *tmp;
NMCryptoFileFormat format = NM_CRYPTO_FILE_FORMAT_UNKNOWN;
NMCryptoKeyType ktype = NM_CRYPTO_KEY_TYPE_UNKNOWN;
gboolean is_encrypted = FALSE;
g_return_val_if_fail (contents != NULL, FALSE);
/* Check for PKCS#12 first */
if (crypto_is_pkcs12_data (contents)) {
if (!password || crypto_verify_pkcs12 (contents, password, error))
format = NM_CRYPTO_FILE_FORMAT_PKCS12;
} else {
/* Maybe it's PKCS#8 */
tmp = parse_pkcs8_key_file (contents, &is_encrypted, error);
if (tmp) {
if (crypto_verify_pkcs8 (tmp, is_encrypted, password, error))
format = NM_CRYPTO_FILE_FORMAT_RAW_KEY;
} else {
g_clear_error (error);
/* Or it's old-style OpenSSL */
tmp = crypto_decrypt_private_key_data (contents, password, &ktype, error);
if (tmp)
format = NM_CRYPTO_FILE_FORMAT_RAW_KEY;
else if (!password && (ktype != NM_CRYPTO_KEY_TYPE_UNKNOWN))
format = NM_CRYPTO_FILE_FORMAT_RAW_KEY;
}
if (tmp) {
/* Don't leave decrypted key data around */
memset (tmp->data, 0, tmp->len);
g_byte_array_free (tmp, TRUE);
}
}
return format;
}
NMCryptoFileFormat
crypto_verify_private_key (const char *filename,
const char *password,
GError **error)
{
GByteArray *contents;
NMCryptoFileFormat format = NM_CRYPTO_FILE_FORMAT_UNKNOWN;
g_return_val_if_fail (filename != NULL, FALSE);
contents = file_to_g_byte_array (filename, error);
if (contents) {
format = crypto_verify_private_key_data (contents, password, error);
g_byte_array_free (contents, TRUE);
}
return format;
}
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