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NetworkManager/libnm-util/crypto.c
Dan Williams b0cf66eda8 2008-06-26 Dan Williams <dcbw@redhat.com> 
* Update FSF address in license headers (Michael Biebl <biebl@debian.org>)



git-svn-id: http://svn-archive.gnome.org/svn/NetworkManager/trunk@3775 4912f4e0-d625-0410-9fb7-b9a5a253dbdc
2008-06-26 18:31:52 +00:00

548 lines
14 KiB
C
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/* NetworkManager Wireless Applet -- Display wireless access points and allow user control
*
* Dan Williams <dcbw@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* (C) Copyright 2007 Red Hat, Inc.
*/
#include <glib.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <glib/gi18n.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;
}
static const char *pem_rsa_key_begin = "-----BEGIN RSA PRIVATE KEY-----";
static const char *pem_rsa_key_end = "-----END RSA PRIVATE KEY-----";
static const char *pem_dsa_key_begin = "-----BEGIN DSA PRIVATE KEY-----";
static const char *pem_dsa_key_end = "-----END DSA PRIVATE KEY-----";
static const char *pem_cert_begin = "-----BEGIN CERTIFICATE-----";
static const char *pem_cert_end = "-----END CERTIFICATE-----";
static const char *
find_tag (const char *tag, const char *buf, gsize len)
{
gsize i, taglen;
taglen = strlen (tag);
if (len < taglen)
return NULL;
for (i = 0; i < len - taglen; i++) {
if (memcmp (buf + i, tag, taglen) == 0)
return buf + i;
}
return NULL;
}
#define DEK_INFO_TAG "DEK-Info: "
#define PROC_TYPE_TAG "Proc-Type: "
static char *
parse_key_file (const char *filename,
int key_type,
gsize *out_length,
char **out_cipher,
char **out_iv,
GError **error)
{
char *contents = NULL;
char **lines = NULL;
char **ln = NULL;
gsize length = 0;
const char *pos;
const char *end;
GString *str = NULL;
int enc_tags = 0;
char *iv = NULL;
char *cipher = NULL;
char *bindata = NULL;
gsize bindata_len = 0;
const char *start_tag;
const char *end_tag;
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 (!g_file_get_contents (filename, &contents, &length, error))
return NULL;
pos = find_tag (start_tag, contents, length);
if (!pos)
goto parse_error;
pos += strlen (start_tag);
end = find_tag (end_tag, pos, contents + length - pos);
if (end == NULL) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_PEM_FORMAT_INVALID,
_("PEM key file had no end tag '%s'."),
end_tag);
goto parse_error;
}
*((char *) end) = '\0';
lines = g_strsplit (pos, "\n", 0);
if (!lines || g_strv_length (lines) <= 1) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_PEM_FORMAT_INVALID,
_("Doesn't look like a PEM private key file."));
goto parse_error;
}
str = g_string_new_len (NULL, end - pos);
if (!str) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_OUT_OF_MEMORY,
_("Not enough memory to store PEM file data."));
goto parse_error;
}
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_PEM_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_PEM_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_PEM_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_PEM_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_PEM_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 {
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_PEM_FORMAT_INVALID,
"Malformed PEM file: both Proc-Type and DEK-Info tags are required.");
goto parse_error;
}
g_string_append (str, p);
}
}
bindata = (char *) g_base64_decode (str->str, &bindata_len);
if (bindata == NULL || !bindata_len) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_DECODE_FAILED,
_("Could not decode private key."));
goto parse_error;
}
if (lines)
g_strfreev (lines);
g_free (contents);
*out_iv = iv;
*out_cipher = cipher;
*out_length = bindata_len;
return bindata;
parse_error:
g_free (bindata);
g_free (cipher);
g_free (iv);
if (lines)
g_strfreev (lines);
g_free (contents);
return NULL;
}
static GByteArray *
file_to_g_byte_array (const char *filename,
GError **error)
{
char *contents, *der = NULL;
GByteArray *array = NULL;
gsize length = 0;
const char *pos;
if (!g_file_get_contents (filename, &contents, &length, error))
return NULL;
pos = find_tag (pem_cert_begin, contents, length);
if (pos) {
const char *end;
pos += strlen (pem_cert_begin);
end = find_tag (pem_cert_end, pos, contents + length - pos);
if (end == NULL) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_PEM_FORMAT_INVALID,
_("PEM certificate '%s' had no end tag '%s'."),
filename, pem_cert_end);
goto done;
}
contents[end - contents - 1] = '\0';
der = (char *) g_base64_decode (pos, &length);
if (der == NULL || !length) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_DECODE_FAILED,
_("Failed to decode certificate."));
goto done;
}
}
array = g_byte_array_sized_new (length);
if (!array) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_OUT_OF_MEMORY,
_("Not enough memory to store certificate data."));
goto done;
}
g_byte_array_append (array, der ? (unsigned char *) der : (unsigned char *) contents, length);
if (array->len != length) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_OUT_OF_MEMORY,
_("Not enough memory to store certificate data."));
g_byte_array_free (array, TRUE);
array = NULL;
}
done:
g_free (der);
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);
if (c == NULL) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_OUT_OF_MEMORY,
_("Not enough memory to store the IV."));
return NULL;
}
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_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 {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_UNKNOWN_CIPHER,
_("Private key cipher '%s' was unknown."),
cipher);
return NULL;
}
key = g_malloc0 (digest_len + 1);
if (!key) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_OUT_OF_MEMORY,
_("Not enough memory to create private key decryption key."));
return NULL;
}
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 char *
decrypt_key (const char *cipher,
int key_type,
const char *data,
gsize data_len,
const char *iv,
const char *password,
gsize *out_len,
GError **error)
{
char *bin_iv = NULL;
gsize bin_iv_len = 0;
char *key = NULL;
gsize key_len = 0;
char *output = NULL;
bin_iv = convert_iv (iv, &bin_iv_len, error);
if (!bin_iv)
return NULL;
/* Convert the PIN and IV into a DES key */
key = make_des_key (cipher, bin_iv, bin_iv_len, password, &key_len, error);
if (!key || !key_len)
goto out;
output = crypto_decrypt (cipher, key_type,
data, data_len,
bin_iv, bin_iv_len,
key, key_len,
out_len,
error);
if (!output)
goto out;
if (*out_len == 0) {
g_free (output);
output = NULL;
goto out;
}
out:
if (key) {
/* Don't leak stale key material */
memset (key, 0, key_len);
g_free (key);
}
g_free (bin_iv);
return output;
}
GByteArray *
crypto_get_private_key (const char *file,
const char *password,
guint32 *out_key_type,
GError **error)
{
GByteArray *array = NULL;
guint32 key_type = NM_CRYPTO_KEY_TYPE_RSA;
char *data = NULL;
gsize data_len = 0;
char *iv = NULL;
char *cipher = NULL;
char *decrypted = NULL;
gsize decrypted_len = 0;
/* Try RSA first */
data = parse_key_file (file, key_type, &data_len, &cipher, &iv, error);
if (!data) {
g_clear_error (error);
/* DSA next */
key_type = NM_CRYPTO_KEY_TYPE_DSA;
data = parse_key_file (file, key_type, &data_len, &cipher, &iv, error);
if (!data)
goto out;
}
decrypted = decrypt_key (cipher,
key_type,
data,
data_len,
iv,
password,
&decrypted_len,
error);
if (!decrypted)
goto out;
array = g_byte_array_sized_new (decrypted_len);
if (!array) {
g_set_error (error, NM_CRYPTO_ERROR,
NM_CRYPTO_ERR_OUT_OF_MEMORY,
_("Not enough memory to store decrypted private key."));
goto out;
}
g_byte_array_append (array, (const guint8 *) decrypted, decrypted_len);
*out_key_type = key_type;
out:
if (decrypted) {
/* Don't expose key material */
memset (decrypted, 0, decrypted_len);
g_free (decrypted);
}
g_free (data);
g_free (cipher);
g_free (iv);
return array;
}
GByteArray *
crypto_load_and_verify_certificate (const char *file,
GError **error)
{
GByteArray *array;
array = file_to_g_byte_array (file, error);
if (!array)
return NULL;
if (!crypto_verify_cert (array->data, array->len, error)) {
g_byte_array_free (array, TRUE);
array = NULL;
}
return array;
}
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