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/*
Authors:
Pavel Březina <pbrezina@redhat.com>
Copyright (C) 2017 Red Hat
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <talloc.h>
#include "util/util.h"
#include "util/sss_ssh.h"
#include "responder/common/responder.h"
#include "responder/common/responder_packet.h"
#include "responder/common/cache_req/cache_req.h"
#include "responder/ssh/ssh_private.h"
errno_t
ssh_protocol_done(struct cli_ctx *cli_ctx, errno_t error)
{
struct cli_protocol *pctx;
errno_t ret;
pctx = talloc_get_type(cli_ctx->protocol_ctx, struct cli_protocol);
switch (error) {
case EOK:
/* Create empty packet if none was provided. */
if (pctx->creq->out == NULL) {
ret = sss_packet_new(pctx->creq, 0,
sss_packet_get_cmd(pctx->creq->in),
&pctx->creq->out);
if (ret != EOK) {
goto done;
}
sss_packet_set_error(pctx->creq->out, EOK);
}
DEBUG(SSSDBG_TRACE_ALL, "Sending reply: success\n");
ret = EOK;
goto done;
default:
DEBUG(SSSDBG_TRACE_ALL, "Sending reply: error [%d]: %s\n",
error, sss_strerror(error));
ret = sss_cmd_send_error(cli_ctx, error);
goto done;
}
done:
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, "Unable to send reply [%d]: %s!\n",
ret, sss_strerror(ret));
return ret;
}
sss_cmd_done(cli_ctx, NULL);
return EOK;
}
static void got_ssh_keys(struct tevent_req *req);
void ssh_protocol_reply(struct cli_ctx *cli_ctx,
struct cache_req_result *result)
{
errno_t ret;
struct tevent_req *req;
/* Make sure we have the results around until the end of the request. To
* avoid copying and memory allocation the keys and certificates from the
* result will be referenced during the next requests, so they should not
* be freed too early. */
result = talloc_steal(cli_ctx, result);
req = ssh_get_output_keys_send(cli_ctx, cli_ctx->ev, cli_ctx,
result->domain, result->msgs[0]);
if (req == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "sss_get_output_keys_send failed.\n");
ret = ENOMEM;
goto done;
}
tevent_req_set_callback(req, got_ssh_keys, cli_ctx);
return;
done:
ssh_protocol_done(cli_ctx, ret);
}
static void got_ssh_keys(struct tevent_req *req)
{
errno_t ret;
struct cli_ctx *cli_ctx = tevent_req_callback_data(req, struct cli_ctx);
struct cli_protocol *pctx;
pctx = talloc_get_type(cli_ctx->protocol_ctx, struct cli_protocol);
struct ldb_message_element **elements;
uint32_t num_keys;
struct sized_string name;
ret = ssh_get_output_keys_recv(req, cli_ctx, &name, &elements, &num_keys);
talloc_zfree(req);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "sss_get_output_keys_revc failed");
goto done;
}
ret = sss_packet_new(pctx->creq, 0, sss_packet_get_cmd(pctx->creq->in),
&pctx->creq->out);
if (ret != EOK) {
goto done;
}
ret = ssh_protocol_build_reply(pctx->creq->out, name, elements, num_keys);
if (ret != EOK) {
goto done;
}
sss_packet_set_error(pctx->creq->out, EOK);
done:
ssh_protocol_done(cli_ctx, ret);
}
static errno_t
ssh_protocol_parse_request(struct cli_ctx *cli_ctx,
const char *default_domain,
const char **_name,
const char **_alias,
const char **_domain)
{
struct cli_protocol *pctx;
const char *name = NULL;
const char *alias = NULL;
const char *domain = NULL;
uint32_t flags;
uint32_t name_len;
uint32_t alias_len;
uint32_t domain_len;
size_t body_len;
uint8_t *body;
size_t c = 0;
pctx = talloc_get_type(cli_ctx->protocol_ctx, struct cli_protocol);
sss_packet_get_body(pctx->creq->in, &body, &body_len);
SAFEALIGN_COPY_UINT32_CHECK(&flags, body + c, body_len, &c);
if (flags & ~(uint32_t)SSS_SSH_REQ_MASK) {
DEBUG(SSSDBG_CRIT_FAILURE, "Invalid flags received [0x%x]\n", flags);
return EINVAL;
}
SAFEALIGN_COPY_UINT32_CHECK(&name_len, body + c, body_len, &c);
if (name_len == 0 || name_len > body_len - c) {
DEBUG(SSSDBG_CRIT_FAILURE, "Invalid name length\n");
return EINVAL;
}
name = (const char *)(body + c);
if (!sss_utf8_check((const uint8_t *)name, name_len-1) ||
name[name_len - 1] != 0) {
DEBUG(SSSDBG_CRIT_FAILURE, "Name is not valid UTF-8 string\n");
return EINVAL;
}
c += name_len;
if (flags & SSS_SSH_REQ_ALIAS) {
SAFEALIGN_COPY_UINT32_CHECK(&alias_len, body + c, body_len, &c);
if (alias_len == 0 || alias_len > body_len - c) {
DEBUG(SSSDBG_CRIT_FAILURE, "Invalid alias length\n");
return EINVAL;
}
alias = (const char *)(body+c);
if (!sss_utf8_check((const uint8_t *)alias, alias_len - 1) ||
alias[alias_len - 1] != 0) {
DEBUG(SSSDBG_CRIT_FAILURE, "Alias is not valid UTF-8 string\n");
return EINVAL;
}
c += alias_len;
}
if (flags & SSS_SSH_REQ_DOMAIN) {
SAFEALIGN_COPY_UINT32_CHECK(&domain_len, body + c, body_len, &c);
if (domain_len > 0) {
if (domain_len > body_len - c) {
DEBUG(SSSDBG_CRIT_FAILURE, "Invalid domain length\n");
return EINVAL;
}
domain = (const char *)(body + c);
if (!sss_utf8_check((const uint8_t *)domain, domain_len - 1) ||
domain[domain_len - 1] != 0) {
DEBUG(SSSDBG_CRIT_FAILURE,
"Domain is not valid UTF-8 string\n");
return EINVAL;
}
c += domain_len;
} else {
domain = default_domain;
}
DEBUG(SSSDBG_TRACE_FUNC,
"Requested domain [%s]\n", domain ? domain : "<ALL>");
}
if (_name != NULL) {
*_name = name;
}
if (_alias != NULL) {
*_alias = alias;
}
if (_domain != NULL) {
*_domain = domain;
}
return EOK;
}
errno_t
ssh_protocol_parse_user(struct cli_ctx *cli_ctx,
const char *default_domain,
const char **_name,
const char **_domain)
{
return ssh_protocol_parse_request(cli_ctx, default_domain,
_name, NULL, _domain);
}
errno_t
ssh_protocol_parse_host(struct cli_ctx *cli_ctx,
const char **_name,
const char **_alias,
const char **_domain)
{
return ssh_protocol_parse_request(cli_ctx, NULL, _name, _alias, _domain);
}
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