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/*
* gnome-keyring
*
* Copyright (C) 2014 Stef Walter
* Copyright (C) 2018 Red Hat, Inc.
*
* This program 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 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see
* <http://www.gnu.org/licenses/>.
*
* Author: Stef Walter <stef@thewalter.net>, Daiki Ueno
*/
#include "config.h"
#include <string.h>
#include "gcr-ssh-agent-util.h"
gboolean
_gcr_ssh_agent_read_packet (GSocketConnection *connection,
EggBuffer *buffer,
GCancellable *cancellable,
GError **error)
{
GInputStream *stream;
guint32 packet_size;
gsize bytes_read;
stream = g_io_stream_get_input_stream (G_IO_STREAM (connection));
egg_buffer_reset (buffer);
egg_buffer_resize (buffer, 4);
if (!g_input_stream_read_all (stream, buffer->buf, 4, &bytes_read, cancellable, error))
return FALSE;
if (bytes_read < 4) {
g_set_error (error, G_IO_ERROR, G_IO_ERROR_CONNECTION_CLOSED,
"connection closed by peer");
return FALSE;
}
if (!egg_buffer_get_uint32 (buffer, 0, NULL, &packet_size) ||
packet_size < 1) {
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"invalid packet size %u",
packet_size);
return FALSE;
}
egg_buffer_resize (buffer, packet_size + 4);
if (!g_input_stream_read_all (stream, buffer->buf + 4, packet_size, &bytes_read, cancellable, error))
return FALSE;
return TRUE;
}
gboolean
_gcr_ssh_agent_write_packet (GSocketConnection *connection,
EggBuffer *buffer,
GCancellable *cancellable,
GError **error)
{
GOutputStream *stream;
gsize bytes_written;
stream = g_io_stream_get_output_stream (G_IO_STREAM (connection));
if (!egg_buffer_set_uint32 (buffer, 0, buffer->len - 4)) {
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"cannot read packet length");
return FALSE;
}
return g_output_stream_write_all (stream, buffer->buf, buffer->len, &bytes_written, cancellable, error);
}
gboolean
_gcr_ssh_agent_call (GSocketConnection *connection,
EggBuffer*req,
EggBuffer *resp,
GCancellable *cancellable,
GError **error)
{
return _gcr_ssh_agent_write_packet (connection, req, cancellable, error) &&
_gcr_ssh_agent_read_packet (connection, resp, cancellable, error);
}
GBytes *
_gcr_ssh_agent_parse_public_key (GBytes *input,
gchar **comment)
{
const guchar *at;
guchar *decoded;
gsize n_decoded;
gint state;
guint save;
const guchar *data;
gsize n_data;
const guchar *keytype;
gsize n_keytype;
g_return_val_if_fail (input, NULL);
data = g_bytes_get_data (input, &n_data);
/* Look for a key line */
for (;;) {
/* Eat space at the front */
while (n_data > 0 && g_ascii_isspace (data[0])) {
++data;
--n_data;
}
/* Not a comment or blank line? Then parse... */
if (data[0] != '#')
break;
/* Skip to the next line */
at = memchr (data, '\n', n_data);
if (!at)
return NULL;
at += 1;
n_data -= (at - data);
data = at;
}
/* Limit to use only the first line */
at = memchr (data, '\n', n_data);
if (at != NULL)
n_data = at - data;
keytype = data;
/* Find the first space */
at = memchr (data, ' ', n_data);
if (!at) {
g_message ("SSH public key missing space");
return NULL;
}
n_keytype = at - data;
/* Skip more whitespace */
n_data -= (at - data);
data = at;
while (n_data > 0 && (data[0] == ' ' || data[0] == '\t')) {
++data;
--n_data;
}
/* Find the next whitespace, or the end */
at = memchr (data, ' ', n_data);
if (at == NULL)
at = data + n_data;
/* Check if the chunk is the base64 key */
if ((at - data) % 4 != 0) {
g_message ("SSH public key missing key data");
return NULL;
}
/* Decode the base64 key */
save = state = 0;
decoded = g_malloc (n_data * 3 / 4);
n_decoded = g_base64_decode_step ((gchar*)data, at - data, decoded, &state, &save);
if (!n_decoded) {
g_free (decoded);
return NULL;
}
/* Check if the key type is prefixed to the decoded blob */
if (!(n_decoded > n_keytype + 4 &&
egg_buffer_decode_uint32 (decoded) == n_keytype &&
memcmp (keytype, decoded + 4, n_keytype) == 0)) {
g_message ("SSH public key missing key type");
g_free (decoded);
return NULL;
}
/* Skip more whitespace */
n_data -= (at - data);
data = at;
while (n_data > 0 && (data[0] == ' ' || data[0] == '\t')) {
++data;
--n_data;
}
/* If there's data left, its the comment */
if (comment)
*comment = n_data ? g_strndup ((gchar*)data, n_data) : g_strdup ("");
return g_bytes_new_take (decoded, n_decoded);
}
gchar *
_gcr_ssh_agent_canon_error (gchar *str)
{
gchar *start = str;
gchar *end = str + strlen (str) + 1;
for (;;) {
start = strchr (start, '\r');
if (!start)
break;
memmove (start, start + 1, end - (start + 1));
}
return str;
}
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