sshsrv_cmd.c revision e7311aec8d691e5427317442387af1bc8fff3742
/*
Authors:
Jan Cholasta <jcholast@redhat.com>
Copyright (C) 2012 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 <talloc.h>
#include "util/util.h"
#include "util/crypto/sss_crypto.h"
#include "db/sysdb.h"
#include "db/sysdb_ssh.h"
#include "providers/data_provider.h"
#include "responder/common/responder.h"
#include "responder/common/responder_packet.h"
#include "responder/ssh/sshsrv_private.h"
static errno_t
ssh_cmd_parse_request(struct ssh_cmd_ctx *cmd_ctx);
static errno_t
ssh_cmd_done(struct ssh_cmd_ctx *cmd_ctx,
errno_t ret);
static errno_t
ssh_user_pubkeys_search(struct ssh_cmd_ctx *cmd_ctx);
int
sss_ssh_cmd_get_user_pubkeys(struct cli_ctx *cctx)
{
errno_t ret;
struct ssh_cmd_ctx *cmd_ctx;
cmd_ctx = talloc_zero(cctx, struct ssh_cmd_ctx);
if (!cmd_ctx) {
return ENOMEM;
}
cmd_ctx->cctx = cctx;
cmd_ctx->type = SSS_DP_USER;
ret = ssh_cmd_parse_request(cmd_ctx);
if (ret != EOK) {
goto done;
}
DEBUG(SSSDBG_TRACE_FUNC,
("Requesting SSH user public keys for [%s] from [%s]\n",
cmd_ctx->name, cmd_ctx->domname ? cmd_ctx->domname : "<ALL>"));
if (cmd_ctx->domname) {
cmd_ctx->domain = responder_get_domain(cctx->rctx->domains,
cmd_ctx->domname);
if (!cmd_ctx->domain) {
ret = ENOENT;
goto done;
}
} else {
cmd_ctx->domain = cctx->rctx->domains;
cmd_ctx->check_next = true;
}
ret = ssh_user_pubkeys_search(cmd_ctx);
done:
return ssh_cmd_done(cmd_ctx, ret);
}
static errno_t
ssh_host_pubkeys_search(struct ssh_cmd_ctx *cmd_ctx);
static int
sss_ssh_cmd_get_host_pubkeys(struct cli_ctx *cctx)
{
struct ssh_cmd_ctx *cmd_ctx;
errno_t ret;
cmd_ctx = talloc_zero(cctx, struct ssh_cmd_ctx);
if (!cmd_ctx) {
return ENOMEM;
}
cmd_ctx->cctx = cctx;
cmd_ctx->type = SSS_DP_HOST;
ret = ssh_cmd_parse_request(cmd_ctx);
if (ret != EOK) {
goto done;
}
DEBUG(SSSDBG_TRACE_FUNC,
("Requesting SSH host public keys for [%s] from [%s]\n",
cmd_ctx->name, cmd_ctx->domname ? cmd_ctx->domname : "<ALL>"));
if (cmd_ctx->domname) {
cmd_ctx->domain = responder_get_domain(cctx->rctx->domains,
cmd_ctx->domname);
if (!cmd_ctx->domain) {
ret = ENOENT;
goto done;
}
} else {
cmd_ctx->domain = cctx->rctx->domains;
cmd_ctx->check_next = true;
}
ret = ssh_host_pubkeys_search(cmd_ctx);
done:
return ssh_cmd_done(cmd_ctx, ret);
}
static void
ssh_dp_send_req_done(struct tevent_req *req)
{
struct dp_callback_ctx *cb_ctx =
tevent_req_callback_data(req, struct dp_callback_ctx);
errno_t ret;
dbus_uint16_t err_maj;
dbus_uint32_t err_min;
char *err_msg;
ret = sss_dp_get_account_recv(cb_ctx->mem_ctx, req,
&err_maj, &err_min,
&err_msg);
talloc_zfree(req);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Fatal error, killing connection!\n"));
talloc_free(cb_ctx->cctx);
return;
}
cb_ctx->callback(err_maj, err_min, err_msg, cb_ctx->ptr);
}
static errno_t
ssh_user_pubkeys_search_next(struct ssh_cmd_ctx *cmd_ctx);
static void
ssh_user_pubkeys_search_dp_callback(uint16_t err_maj,
uint32_t err_min,
const char *err_msg,
void *ptr);
static errno_t
ssh_user_pubkeys_search(struct ssh_cmd_ctx *cmd_ctx)
{
struct tevent_req *req;
struct dp_callback_ctx *cb_ctx;
/* if it is a domainless search, skip domains that require fully
* qualified names instead */
while (cmd_ctx->domain && cmd_ctx->check_next && cmd_ctx->domain->fqnames) {
cmd_ctx->domain = cmd_ctx->domain->next;
}
if (!cmd_ctx->domain) {
DEBUG(SSSDBG_OP_FAILURE,
("No matching domain found for [%s], fail!\n", cmd_ctx->name));
return ENOENT;
}
/* refresh the user's cache entry */
if (NEED_CHECK_PROVIDER(cmd_ctx->domain->provider)) {
req = sss_dp_get_account_send(cmd_ctx, cmd_ctx->cctx->rctx,
cmd_ctx->domain, false, SSS_DP_USER,
cmd_ctx->name, 0, NULL);
if (!req) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Out of memory sending data provider request\n"));
return ENOMEM;
}
cb_ctx = talloc_zero(cmd_ctx, struct dp_callback_ctx);
if (!cb_ctx) {
talloc_zfree(req);
return ENOMEM;
}
cb_ctx->callback = ssh_user_pubkeys_search_dp_callback;
cb_ctx->ptr = cmd_ctx;
cb_ctx->cctx = cmd_ctx->cctx;
cb_ctx->mem_ctx = cmd_ctx;
tevent_req_set_callback(req, ssh_dp_send_req_done, cb_ctx);
/* tell caller we are in an async call */
return EAGAIN;
}
return ssh_user_pubkeys_search_next(cmd_ctx);
}
static errno_t
ssh_user_pubkeys_search_next(struct ssh_cmd_ctx *cmd_ctx)
{
errno_t ret;
struct cli_ctx *cctx = cmd_ctx->cctx;
struct sysdb_ctx *sysdb;
const char *attrs[] = { SYSDB_NAME, SYSDB_SSH_PUBKEY, NULL };
struct ldb_result *res;
DEBUG(SSSDBG_TRACE_FUNC,
("Requesting SSH user public keys for [%s@%s]\n",
cmd_ctx->name, cmd_ctx->domain->name));
ret = sysdb_get_ctx_from_list(cctx->rctx->db_list, cmd_ctx->domain, &sysdb);
if (ret != EOK) {
DEBUG(SSSDBG_FATAL_FAILURE,
("Fatal: Sysdb CTX not found for this domain!\n"));
return EFAULT;
}
ret = sysdb_get_user_attr(cmd_ctx, sysdb,
cmd_ctx->name, attrs, &res);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Failed to make request to our cache!\n"));
return EIO;
}
cmd_ctx->results = res->msgs;
cmd_ctx->results_len = res->count;
if (cmd_ctx->results_len > 1) {
DEBUG(SSSDBG_FATAL_FAILURE,
("User search by name (%s) returned > 1 results!\n",
cmd_ctx->name));
return ENOENT;
}
if (cmd_ctx->results_len == 0) {
/* if a multidomain search, try with next */
if (cmd_ctx->check_next) {
cmd_ctx->domain = cmd_ctx->domain->next;
return ssh_user_pubkeys_search(cmd_ctx);
}
DEBUG(SSSDBG_OP_FAILURE,
("No attributes for user [%s] found.\n", cmd_ctx->name));
return ENOENT;
}
/* one result found */
return EOK;
}
static void
ssh_user_pubkeys_search_dp_callback(uint16_t err_maj,
uint32_t err_min,
const char *err_msg,
void *ptr)
{
struct ssh_cmd_ctx *cmd_ctx = talloc_get_type(ptr, struct ssh_cmd_ctx);
errno_t ret;
if (err_maj) {
DEBUG(SSSDBG_OP_FAILURE,
("Unable to get information from Data Provider\n"
"Error: %u, %u, %s\n",
(unsigned int)err_maj, (unsigned int)err_min, err_msg));
}
ret = ssh_user_pubkeys_search_next(cmd_ctx);
ssh_cmd_done(cmd_ctx, ret);
}
static errno_t
ssh_host_pubkeys_search_next(struct ssh_cmd_ctx *cmd_ctx);
static void
ssh_host_pubkeys_search_dp_callback(uint16_t err_maj,
uint32_t err_min,
const char *err_msg,
void *ptr);
static errno_t
ssh_host_pubkeys_search(struct ssh_cmd_ctx *cmd_ctx)
{
struct tevent_req *req;
struct dp_callback_ctx *cb_ctx;
/* if it is a domainless search, skip domains that require fully
* qualified names instead */
while (cmd_ctx->domain && cmd_ctx->check_next && cmd_ctx->domain->fqnames) {
cmd_ctx->domain = cmd_ctx->domain->next;
}
if (!cmd_ctx->domain) {
DEBUG(SSSDBG_OP_FAILURE,
("No matching domain found for [%s], fail!\n", cmd_ctx->name));
return ENOENT;
}
/* refresh the host's cache entry */
if (NEED_CHECK_PROVIDER(cmd_ctx->domain->provider)) {
req = sss_dp_get_account_send(cmd_ctx, cmd_ctx->cctx->rctx,
cmd_ctx->domain, false, SSS_DP_HOST,
cmd_ctx->name, 0, NULL);
if (!req) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Out of memory sending data provider request\n"));
return ENOMEM;
}
cb_ctx = talloc_zero(cmd_ctx, struct dp_callback_ctx);
if (!cb_ctx) {
talloc_zfree(req);
return ENOMEM;
}
cb_ctx->callback = ssh_host_pubkeys_search_dp_callback;
cb_ctx->ptr = cmd_ctx;
cb_ctx->cctx = cmd_ctx->cctx;
cb_ctx->mem_ctx = cmd_ctx;
tevent_req_set_callback(req, ssh_dp_send_req_done, cb_ctx);
/* tell caller we are in an async call */
return EAGAIN;
}
return ssh_host_pubkeys_search_next(cmd_ctx);
}
static errno_t
ssh_host_pubkeys_search_next(struct ssh_cmd_ctx *cmd_ctx)
{
errno_t ret;
struct cli_ctx *cctx = cmd_ctx->cctx;
struct sysdb_ctx *sysdb;
const char *attrs[] = { SYSDB_NAME, SYSDB_SSH_PUBKEY, NULL };
DEBUG(SSSDBG_TRACE_FUNC,
("Requesting SSH host public keys for [%s@%s]\n",
cmd_ctx->name, cmd_ctx->domain->name));
ret = sysdb_get_ctx_from_list(cctx->rctx->db_list, cmd_ctx->domain, &sysdb);
if (ret != EOK) {
DEBUG(SSSDBG_FATAL_FAILURE,
("Fatal: Sysdb CTX not found for this domain!\n"));
return EFAULT;
}
ret = sysdb_search_ssh_hosts(cmd_ctx, sysdb,
cmd_ctx->name, attrs,
&cmd_ctx->results, &cmd_ctx->results_len);
if (ret != EOK && ret != ENOENT) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Failed to make request to our cache!\n"));
return EIO;
}
if (cmd_ctx->results_len > 1) {
DEBUG(SSSDBG_FATAL_FAILURE,
("Host search by name (%s) returned > 1 results!\n",
cmd_ctx->name));
return ENOENT;
}
if (cmd_ctx->results_len == 0) {
/* if a multidomain search, try with next */
if (cmd_ctx->check_next) {
cmd_ctx->domain = cmd_ctx->domain->next;
return ssh_host_pubkeys_search(cmd_ctx);
}
DEBUG(SSSDBG_OP_FAILURE,
("No attributes for host [%s] found.\n", cmd_ctx->name));
return ENOENT;
}
/* one result found */
return EOK;
}
static void
ssh_host_pubkeys_search_dp_callback(uint16_t err_maj,
uint32_t err_min,
const char *err_msg,
void *ptr)
{
struct ssh_cmd_ctx *cmd_ctx = talloc_get_type(ptr, struct ssh_cmd_ctx);
errno_t ret;
if (err_maj) {
DEBUG(SSSDBG_OP_FAILURE,
("Unable to get information from Data Provider\n"
"Error: %u, %u, %s\n",
(unsigned int)err_maj, (unsigned int)err_min, err_msg));
}
ret = ssh_host_pubkeys_search_next(cmd_ctx);
ssh_cmd_done(cmd_ctx, ret);
}
static errno_t
ssh_cmd_parse_request(struct ssh_cmd_ctx *cmd_ctx)
{
struct cli_ctx *cctx = cmd_ctx->cctx;
errno_t ret;
uint8_t *body;
size_t body_len;
size_t c = 0;
uint32_t reserved;
uint32_t name_len;
char *name;
sss_packet_get_body(cctx->creq->in, &body, &body_len);
SAFEALIGN_COPY_UINT32_CHECK(&reserved, body+c, body_len, &c);
if (reserved != 0) {
return EINVAL;
}
SAFEALIGN_COPY_UINT32_CHECK(&name_len, body+c, body_len, &c);
if (name_len == 0) {
return EINVAL;
}
name = (char *)(body+c);
if (strnlen(name, name_len) != name_len-1) {
return EINVAL;
}
c += name_len;
ret = sss_parse_name(cmd_ctx, cctx->rctx->names, name,
&cmd_ctx->domname, &cmd_ctx->name);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, ("Invalid name received [%s]\n", name));
return ENOENT;
}
return EOK;
}
static errno_t
ssh_cmd_build_reply(struct ssh_cmd_ctx *cmd_ctx)
{
struct cli_ctx *cctx = cmd_ctx->cctx;
errno_t ret;
uint8_t *body;
size_t body_len;
size_t c = 0;
size_t i;
unsigned int j;
struct ldb_message_element *el;
uint32_t count = 0;
const char *name;
char *fqname;
uint32_t fqname_len;
uint8_t *key;
size_t key_len;
ret = sss_packet_new(cctx->creq, 0,
sss_packet_get_cmd(cctx->creq->in),
&cctx->creq->out);
if (ret != EOK) {
return ret;
}
/* count number of results */
for (i = 0; i < cmd_ctx->results_len; i++) {
el = ldb_msg_find_element(cmd_ctx->results[i], SYSDB_SSH_PUBKEY);
if (!el) {
continue;
}
count += el->num_values;
}
ret = sss_packet_grow(cctx->creq->out, 2*sizeof(uint32_t));
if (ret != EOK) {
return ret;
}
sss_packet_get_body(cctx->creq->out, &body, &body_len);
SAFEALIGN_SET_UINT32(body+c, count, &c);
SAFEALIGN_SET_UINT32(body+c, 0, &c);
for (i = 0; i < cmd_ctx->results_len; i++) {
name = ldb_msg_find_attr_as_string(cmd_ctx->results[i],
SYSDB_NAME, NULL);
if (!name) {
DEBUG(SSSDBG_OP_FAILURE,
("Got unnamed result for [%s@%s]\n",
cmd_ctx->name, cmd_ctx->domain->name));
return ENOENT;
}
fqname = talloc_asprintf(cmd_ctx, "%s@%s",
name, cmd_ctx->domain->name);
if (!fqname) {
return ENOMEM;
}
fqname_len = strlen(fqname)+1;
el = ldb_msg_find_element(cmd_ctx->results[i], SYSDB_SSH_PUBKEY);
if (!el) {
/* this object has no SSH public keys */
continue;
}
for (j = 0; j < el->num_values; j++) {
key = sss_base64_decode(cmd_ctx,
(const char *)el->values[j].data,
&key_len);
if (!key) {
return ENOMEM;
}
ret = sss_packet_grow(cctx->creq->out,
3*sizeof(uint32_t) + key_len + fqname_len);
if (ret != EOK) {
talloc_free(key);
return ret;
}
sss_packet_get_body(cctx->creq->out, &body, &body_len);
SAFEALIGN_SET_UINT32(body+c, 0, &c);
SAFEALIGN_SET_UINT32(body+c, fqname_len, &c);
safealign_memcpy(body+c, fqname, fqname_len, &c);
SAFEALIGN_SET_UINT32(body+c, key_len, &c);
safealign_memcpy(body+c, key, key_len, &c);
talloc_free(key);
count++;
}
}
return EOK;
}
static errno_t
ssh_cmd_send_error(struct ssh_cmd_ctx *cmd_ctx,
errno_t error)
{
struct cli_ctx *cctx = cmd_ctx->cctx;
errno_t ret;
ret = sss_cmd_send_error(cctx, error);
if (ret != EOK) {
return ret;
}
sss_cmd_done(cctx, cmd_ctx);
return EOK;
}
static errno_t
ssh_cmd_send_reply(struct ssh_cmd_ctx *cmd_ctx)
{
struct cli_ctx *cctx = cmd_ctx->cctx;
errno_t ret;
/* create response packet */
ret = ssh_cmd_build_reply(cmd_ctx);
if (ret != EOK) {
return ret;
}
sss_packet_set_error(cctx->creq->out, EOK);
sss_cmd_done(cctx, cmd_ctx);
return EOK;
}
static errno_t
ssh_cmd_done(struct ssh_cmd_ctx *cmd_ctx,
errno_t ret)
{
switch (ret) {
case EOK:
ret = ssh_cmd_send_reply(cmd_ctx);
break;
case EAGAIN:
return EOK;
case EFAULT:
break;
default:
ret = ssh_cmd_send_error(cmd_ctx, ret);
break;
}
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Fatal error, killing connection!\n"));
talloc_free(cmd_ctx->cctx);
return EFAULT;
}
return EOK;
}
struct cli_protocol_version *register_cli_protocol_version(void)
{
static struct cli_protocol_version ssh_cli_protocol_version[] = {
{0, NULL, NULL}
};
return ssh_cli_protocol_version;
}
struct sss_cmd_table *get_ssh_cmds(void) {
static struct sss_cmd_table ssh_cmds[] = {
{SSS_GET_VERSION, sss_cmd_get_version},
{SSS_SSH_GET_USER_PUBKEYS, sss_ssh_cmd_get_user_pubkeys},
{SSS_SSH_GET_HOST_PUBKEYS, sss_ssh_cmd_get_host_pubkeys},
{SSS_CLI_NULL, NULL}
};
return ssh_cmds;
}