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/*
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 <arpa/inet.h>
#include "db/sysdb.h"
#include "util/util.h"
#include "util/crypto/sss_crypto.h"
#include "util/sss_ssh.h"
errno_t
sss_ssh_make_ent(TALLOC_CTX *mem_ctx,
struct ldb_message *msg,
struct sss_ssh_ent **result)
{
TALLOC_CTX *tmp_ctx;
struct sss_ssh_ent *res = NULL;
errno_t ret;
const char *name;
struct ldb_message_element *el;
unsigned int i;
tmp_ctx = talloc_new(NULL);
if (!tmp_ctx) {
return ENOMEM;
}
name = ldb_msg_find_attr_as_string(msg, SYSDB_NAME, NULL);
if (!name) {
ret = EINVAL;
DEBUG(SSSDBG_CRIT_FAILURE, "Host is missing name attribute\n");
goto done;
}
res = talloc_zero(tmp_ctx, struct sss_ssh_ent);
if (!res) {
ret = ENOMEM;
goto done;
}
res->name = talloc_strdup(res, name);
if (!res->name) {
ret = ENOMEM;
goto done;
}
el = ldb_msg_find_element(msg, SYSDB_SSH_PUBKEY);
if (el) {
res->num_pubkeys = el->num_values;
res->pubkeys = talloc_array(res, struct sss_ssh_pubkey,
res->num_pubkeys);
if (!res->pubkeys) {
ret = ENOMEM;
goto done;
}
for (i = 0; i < el->num_values; i++) {
res->pubkeys[i].data = sss_base64_decode(res->pubkeys,
(char *)el->values[i].data, &res->pubkeys[i].data_len);
if (!res->pubkeys[i].data) {
ret = ENOMEM;
goto done;
}
}
}
el = ldb_msg_find_element(msg, SYSDB_NAME_ALIAS);
if (el) {
res->num_aliases = el->num_values;
res->aliases = talloc_array(res, char *, res->num_aliases);
if (!res->aliases) {
ret = ENOMEM;
goto done;
}
for (i = 0; i < el->num_values; i++) {
res->aliases[i] = talloc_strdup(res->aliases,
(char *)el->values[i].data);
if (!res->aliases[i]) {
ret = ENOMEM;
goto done;
}
}
}
*result = talloc_steal(mem_ctx, res);
ret = EOK;
done:
talloc_free(tmp_ctx);
return ret;
}
static errno_t
sss_ssh_get_pubkey_algorithm(TALLOC_CTX *mem_ctx,
struct sss_ssh_pubkey *pubkey,
char **result)
{
size_t c = 0;
uint32_t algo_len;
char *algo;
if (pubkey->data_len < 5) {
return EINVAL;
}
SAFEALIGN_COPY_UINT32(&algo_len, pubkey->data, &c);
algo_len = ntohl(algo_len);
if (algo_len < 1 || algo_len > 64 || algo_len > pubkey->data_len - 4) {
/* the maximum length of 64 is defined in RFC 4250 */
return EINVAL;
}
algo = talloc_zero_array(mem_ctx, char, algo_len+1);
if (!algo) {
return ENOMEM;
}
memcpy(algo, pubkey->data+c, algo_len);
*result = algo;
return EOK;
}
errno_t
sss_ssh_format_pubkey(TALLOC_CTX *mem_ctx,
struct sss_ssh_pubkey *pubkey,
char **result)
{
TALLOC_CTX *tmp_ctx;
errno_t ret;
char *blob;
char *algo;
char *out = NULL;
size_t i;
tmp_ctx = talloc_new(NULL);
if (!tmp_ctx) {
return ENOMEM;
}
if (pubkey->data_len > 4 && memcmp(pubkey->data, "\0\0\0", 3) == 0) {
/* All valid public key blobs start with 3 null bytes (see RFC 4253
* section 6.6, RFC 4251 section 5 and RFC 4250 section 4.6)
*/
blob = sss_base64_encode(tmp_ctx, pubkey->data, pubkey->data_len);
if (!blob) {
ret = ENOMEM;
goto done;
}
ret = sss_ssh_get_pubkey_algorithm(tmp_ctx, pubkey, &algo);
if (ret != EOK) {
goto done;
}
out = talloc_asprintf(mem_ctx, "%s %s", algo, blob);
if (!out) {
ret = ENOMEM;
goto done;
}
} else {
/* Not a valid public key blob, so this must be a textual public key */
for (i = 0; i < pubkey->data_len; i++) {
if (!pubkey->data[i] || pubkey->data[i] == '\n' ||
pubkey->data[i] == '\r') {
ret = EINVAL;
goto done;
}
}
out = talloc_array(mem_ctx, char, pubkey->data_len + 1);
if (!out) {
ret = ENOMEM;
goto done;
}
memcpy(out, pubkey->data, pubkey->data_len);
out[pubkey->data_len] = 0;
}
*result = out;
ret = EOK;
done:
talloc_free(tmp_ctx);
return ret;
}
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