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kb.c
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kb.c
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/* SPDX-FileCopyrightText: 2014-2023 Greenbone AG
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/**
* @file
* @brief Knowledge base management API - Redis backend.
*/
#define _GNU_SOURCE
#include "kb.h"
#include <errno.h> /* for ENOMEM, EINVAL, EPROTO, EALREADY, ECONN... */
#include <glib.h> /* for g_log, g_free */
#include <hiredis/hiredis.h> /* for redisReply, freeReplyObject, redisCommand */
#include <stdbool.h> /* for bool, true, false */
#include <stdio.h>
#include <stdlib.h> /* for atoi */
#include <string.h> /* for strlen, strerror, strncpy, memset */
#undef G_LOG_DOMAIN
/**
* @brief GLib logging domain.
*/
#define G_LOG_DOMAIN "libgvm util"
#if GLIB_CHECK_VERSION(2, 67, 3)
#define memdup g_memdup2
#else
#define memdup g_memdup
#endif
/**
* @file kb.c
*
* @brief Contains specialized structures and functions to use redis as a KB
* server.
*/
/**
* @brief Name of the namespace usage bitmap in redis.
*/
#define GLOBAL_DBINDEX_NAME "GVM.__GlobalDBIndex"
static const struct kb_operations KBRedisOperations;
/**
* @brief Subclass of struct kb, it contains the redis-specific fields, such as
* the redis context, current DB (namespace) id and the server socket
* path.
*/
struct kb_redis
{
struct kb kb; /**< Parent KB handle. */
unsigned int max_db; /**< Max # of databases. */
unsigned int db; /**< Namespace ID number, 0 if uninitialized. */
redisContext *rctx; /**< Redis client context. */
char *path; /**< Path to the server socket. */
};
#define redis_kb(__kb) ((struct kb_redis *) (__kb))
static int
redis_delete_all (struct kb_redis *);
static int redis_lnk_reset (kb_t);
static int
redis_flush_all (kb_t, const char *);
static redisReply *
redis_cmd (struct kb_redis *kbr, const char *fmt, ...);
/**
* @brief Attempt to atomically acquire ownership of a database.
*
* @return 0 on success, negative integer otherwise.
*/
static int
try_database_index (struct kb_redis *kbr, int index)
{
redisContext *ctx = kbr->rctx;
redisReply *rep;
int rc = 0;
rep = redisCommand (ctx, "HSETNX %s %d 1", GLOBAL_DBINDEX_NAME, index);
if (rep == NULL)
return -ENOMEM;
if (rep->type != REDIS_REPLY_INTEGER)
rc = -EPROTO;
else if (rep->integer == 0)
rc = -EALREADY;
else
kbr->db = index;
freeReplyObject (rep);
return rc;
}
/**
* @brief Set the number of databases have been configured
* into kbr struct.
*
* @param[in] kbr Subclass of struct kb where to save the max db index founded.
*
* @return 0 on success, -1 on error.
*/
static int
fetch_max_db_index (struct kb_redis *kbr)
{
int rc = 0;
redisContext *ctx = kbr->rctx;
redisReply *rep = NULL;
rep = redisCommand (ctx, "CONFIG GET databases");
if (rep == NULL)
{
g_log (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL,
"%s: redis command failed with '%s'", __func__, ctx->errstr);
rc = -1;
goto err_cleanup;
}
if (rep->type != REDIS_REPLY_ARRAY)
{
g_log (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL,
"%s: cannot retrieve max DB number: %s", __func__, rep->str);
rc = -1;
goto err_cleanup;
}
if (rep->elements == 2)
{
kbr->max_db = (unsigned) atoi (rep->element[1]->str);
}
else
{
g_log (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL,
"%s: unexpected reply length (%zd)", __func__, rep->elements);
rc = -1;
goto err_cleanup;
}
g_debug ("%s: maximum DB number: %u", __func__, kbr->max_db);
err_cleanup:
if (rep != NULL)
freeReplyObject (rep);
return rc;
}
/**
* @brief Select DB.
*
* WARNING: do not call redis_cmd in here, since our context is not fully
* acquired yet!
*
* @param[in] kbr Subclass of struct kb where to save the db index.
*
* @return 0 on success, -1 on error.
*/
static int
select_database (struct kb_redis *kbr)
{
int rc;
redisContext *ctx = kbr->rctx;
redisReply *rep = NULL;
if (kbr->db == 0)
{
unsigned i;
if (kbr->max_db == 0)
fetch_max_db_index (kbr);
for (i = 1; i < kbr->max_db; i++)
{
rc = try_database_index (kbr, i);
if (rc == 0)
break;
}
}
/* No DB available, give up. */
if (kbr->db == 0)
{
rc = -1;
goto err_cleanup;
}
rep = redisCommand (ctx, "SELECT %u", kbr->db);
if (rep == NULL || rep->type != REDIS_REPLY_STATUS)
{
rc = -1;
goto err_cleanup;
}
rc = 0;
err_cleanup:
if (rep != NULL)
freeReplyObject (rep);
return rc;
}
/**
* @brief Release DB.
*
* @param[in] kbr Subclass of struct kb.
*
* @return 0 on success, -1 on error.
*/
static int
redis_release_db (struct kb_redis *kbr)
{
int rc;
redisContext *ctx = kbr->rctx;
redisReply *rep;
if (ctx == NULL)
return -EINVAL;
rep = redisCommand (ctx, "SELECT 0"); /* Management database*/
if (rep == NULL || rep->type != REDIS_REPLY_STATUS)
{
rc = -1;
goto err_cleanup;
}
freeReplyObject (rep);
rep = redisCommand (ctx, "HDEL %s %d", GLOBAL_DBINDEX_NAME, kbr->db);
if (rep == NULL || rep->type != REDIS_REPLY_INTEGER)
{
rc = -1;
goto err_cleanup;
}
rc = 0;
err_cleanup:
if (rep != NULL)
freeReplyObject (rep);
return rc;
}
static inline char *
parse_port_of_addr (const char *addr, int tcp_indicator_len)
{
char *tmp;
int is_ip_v6;
if ((tmp = rindex (addr + tcp_indicator_len, ':')) == NULL)
return NULL;
is_ip_v6 = addr[tcp_indicator_len] == '[';
if (is_ip_v6 && (tmp - 1)[0] != ']')
return NULL;
return tmp + 1;
}
static redisContext *
connect_redis (const char *addr, int len)
{
const char *tcp_indicator = "tcp://";
const int tcp_indicator_len = strlen (tcp_indicator);
const int redis_default_port = 6379;
int port, host_len;
char *tmp, *host;
redisContext *result;
static int warn_flag = 0;
if (len < tcp_indicator_len + 1)
goto unix_connect;
if (memcmp (addr, tcp_indicator, tcp_indicator_len) != 0)
goto unix_connect;
host_len = len - tcp_indicator_len;
if ((tmp = parse_port_of_addr (addr, tcp_indicator_len)) == NULL)
port = redis_default_port;
else
{
port = atoi (tmp);
host_len -= strlen (tmp) + 1;
}
host = calloc (1, host_len);
memmove (host, addr + tcp_indicator_len, host_len);
result = redisConnect (host, port);
if (warn_flag == 0)
{
g_warning ("A Redis TCP connection is being used. This feature is "
"experimental and insecure, since it is not an encrypted "
"channel. We discourage its usage in production environments");
warn_flag = 1;
}
free (host);
return result;
unix_connect:
return redisConnectUnix (addr);
}
/**
* @brief Get redis context if it is already connected or do a
* a connection.
*
* @param[in] kbr Subclass of struct kb where to fetch the context.
* or where it is saved in case of a new connection.
*
* @return 0 on success, -1 on connection error, -2 on unavailable DB slot.
*/
static int
get_redis_ctx (struct kb_redis *kbr)
{
int rc;
if (kbr->rctx != NULL)
return 0;
kbr->rctx = connect_redis (kbr->path, strlen (kbr->path));
if (kbr->rctx == NULL || kbr->rctx->err)
{
g_log (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL,
"%s: redis connection error to %s: %s", __func__, kbr->path,
kbr->rctx ? kbr->rctx->errstr : strerror (ENOMEM));
redisFree (kbr->rctx);
kbr->rctx = NULL;
return -1;
}
rc = select_database (kbr);
if (rc)
{
g_log (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL, "No redis DB available");
redisFree (kbr->rctx);
kbr->rctx = NULL;
return -2;
}
g_debug ("%s: connected to redis://%s/%d", __func__, kbr->path, kbr->db);
return 0;
}
/**
* @brief Test redis connection.
*
* @param[in] kbr Subclass of struct kb to test.
*
* @return 0 on success, negative integer on error.
*/
static int
redis_test_connection (struct kb_redis *kbr)
{
int rc = 0;
redisReply *rep;
rep = redis_cmd (kbr, "PING");
if (rep == NULL)
{
/* not 100% relevant but hiredis doesn't provide us with proper error
* codes. */
rc = -ECONNREFUSED;
goto out;
}
if (rep->type != REDIS_REPLY_STATUS)
{
rc = -EINVAL;
goto out;
}
if (g_ascii_strcasecmp (rep->str, "PONG"))
{
rc = -EPROTO;
goto out;
}
out:
if (rep != NULL)
freeReplyObject (rep);
return rc;
}
/**
* @brief Delete all entries and release ownership on the namespace.
*
* @param[in] kb KB handle to release.
*
* @return 0 on success, non-null on error.
*/
static int
redis_delete (kb_t kb)
{
struct kb_redis *kbr;
kbr = redis_kb (kb);
redis_delete_all (kbr);
redis_release_db (kbr);
if (kbr->rctx != NULL)
{
g_free (kbr->path);
redisFree (kbr->rctx);
kbr->rctx = NULL;
}
g_free (kb);
return 0;
}
/**
* @brief Return the kb index
*
* @param[in] kb KB handle.
*
* @return kb_index on success, null on error.
*/
static int
redis_get_kb_index (kb_t kb)
{
int i;
i = ((struct kb_redis *) kb)->db;
if (i > 0)
return i;
return -1;
}
/**
* @brief Attempt to purge dirty pages.
*
* Attempt to purge dirty pages so these can be reclaimed by the allocator.
* This command only works when using jemalloc as an allocator, and evaluates
* to a benign NOOP for all others. Command is applied to complete redis
* instance and not only single db.
*
* @param[in] kb KB handle where to run the command.
*
* @return 0 on success, non-null on error.
*/
static int
redis_memory_purge (kb_t kb)
{
redisReply *rep;
int rc = 0;
rep = redis_cmd (redis_kb (kb), "MEMORY PURGE");
if (!rep || rep->type == REDIS_REPLY_ERROR)
rc = -1;
if (rep)
freeReplyObject (rep);
return rc;
}
/**
* @brief Initialize a new Knowledge Base object.
*
* @param[in] kb Reference to a kb_t to initialize.
* @param[in] kb_path Path to KB.
*
* @return 0 on success, -1 on connection error, -2 when no DB is available, -3
* when given kb_path was NULL.
*/
static int
redis_new (kb_t *kb, const char *kb_path)
{
struct kb_redis *kbr;
int rc = 0;
if (kb_path == NULL)
return -3;
kbr = g_malloc0 (sizeof (struct kb_redis));
kbr->kb.kb_ops = &KBRedisOperations;
kbr->path = g_strdup (kb_path);
if ((rc = get_redis_ctx (kbr)) < 0)
{
redis_delete ((kb_t) kbr);
return rc;
}
if (redis_test_connection (kbr))
{
g_log (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL,
"%s: cannot access redis at '%s'", __func__, kb_path);
redis_delete ((kb_t) kbr);
kbr = NULL;
rc = -1;
}
/* Ensure that the new kb is clean */
redis_delete_all (kbr);
*kb = (kb_t) kbr;
/* Try to make unused memory available for the OS again. */
if (redis_memory_purge (*kb))
g_warning ("%s: Memory purge was not successful", __func__);
return rc;
}
/**
* @brief Connect to a Knowledge Base object with the given kb_index.
*
* @param[in] kb_path Path to KB.
* @param[in] kb_index DB index
*
* @return Knowledge Base object, NULL otherwise.
*/
static kb_t
redis_direct_conn (const char *kb_path, const int kb_index)
{
struct kb_redis *kbr;
redisReply *rep;
if (kb_path == NULL)
return NULL;
kbr = g_malloc0 (sizeof (struct kb_redis));
kbr->kb.kb_ops = &KBRedisOperations;
kbr->path = g_strdup (kb_path);
kbr->rctx = connect_redis (kbr->path, strlen (kbr->path));
if (kbr->rctx == NULL || kbr->rctx->err)
{
g_log (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL,
"%s: redis connection error to %s: %s", __func__, kbr->path,
kbr->rctx ? kbr->rctx->errstr : strerror (ENOMEM));
redisFree (kbr->rctx);
g_free (kbr->path);
g_free (kbr);
return NULL;
}
kbr->db = kb_index;
rep = redisCommand (kbr->rctx, "SELECT %d", kb_index);
if (rep == NULL || rep->type != REDIS_REPLY_STATUS)
{
if (rep != NULL)
freeReplyObject (rep);
redisFree (kbr->rctx);
kbr->rctx = NULL;
g_free (kbr->path);
g_free (kbr);
return NULL;
}
freeReplyObject (rep);
return (kb_t) kbr;
}
/**
* @brief Find an existing Knowledge Base object with key.
*
* @param[in] kb_path Path to KB.
* @param[in] key Marker key to search for in KB objects.
*
* @return Knowledge Base object, NULL otherwise.
*/
static kb_t
redis_find (const char *kb_path, const char *key)
{
struct kb_redis *kbr;
unsigned int i = 1;
if (kb_path == NULL)
return NULL;
kbr = g_malloc0 (sizeof (struct kb_redis));
kbr->kb.kb_ops = &KBRedisOperations;
kbr->path = g_strdup (kb_path);
do
{
redisReply *rep;
kbr->rctx = connect_redis (kbr->path, strlen (kbr->path));
if (kbr->rctx == NULL || kbr->rctx->err)
{
g_log (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL,
"%s: redis connection error to %s: %s", __func__, kbr->path,
kbr->rctx ? kbr->rctx->errstr : strerror (ENOMEM));
redisFree (kbr->rctx);
g_free (kbr->path);
g_free (kbr);
return NULL;
}
if (kbr->max_db == 0)
fetch_max_db_index (kbr);
kbr->db = i;
rep = redisCommand (kbr->rctx, "HEXISTS %s %d", GLOBAL_DBINDEX_NAME, i);
if (rep == NULL || rep->type != REDIS_REPLY_INTEGER || rep->integer != 1)
{
if (rep != NULL)
freeReplyObject (rep);
i++;
redisFree (kbr->rctx);
kbr->rctx = NULL;
continue;
}
freeReplyObject (rep);
rep = redisCommand (kbr->rctx, "SELECT %u", i);
if (rep == NULL || rep->type != REDIS_REPLY_STATUS)
{
redisFree (kbr->rctx);
kbr->rctx = NULL;
}
else
{
freeReplyObject (rep);
if (key)
{
char *tmp = kb_item_get_str (&kbr->kb, key);
if (tmp)
{
g_free (tmp);
return (kb_t) kbr;
}
}
redisFree (kbr->rctx);
}
i++;
}
while (i < kbr->max_db);
g_free (kbr->path);
g_free (kbr);
return NULL;
}
/**
* @brief Release a KB item (or a list).
*
* @param[in] item Item or list to be release
*/
void
kb_item_free (struct kb_item *item)
{
while (item != NULL)
{
struct kb_item *next;
next = item->next;
if (item->type == KB_TYPE_STR && item->v_str != NULL)
g_free (item->v_str);
g_free (item);
item = next;
}
}
/**
* @brief Give a single KB item.
*
* @param[in] name Name of the item.
* @param[in] elt A redisReply element where to fetch the item.
* @param[in] force_int To force string to integer conversion.
*
* @return Single retrieve kb_item on success, NULL otherwise.
*/
static struct kb_item *
redis2kbitem_single (const char *name, const redisReply *elt, int force_int)
{
struct kb_item *item;
size_t namelen;
if (elt->type != REDIS_REPLY_STRING && elt->type != REDIS_REPLY_INTEGER)
return NULL;
namelen = strlen (name) + 1;
item = g_malloc0 (sizeof (struct kb_item) + namelen);
if (elt->type == REDIS_REPLY_INTEGER)
{
item->type = KB_TYPE_INT;
item->v_int = elt->integer;
}
else if (force_int)
{
item->type = KB_TYPE_INT;
item->v_int = atoi (elt->str);
}
else
{
item->type = KB_TYPE_STR;
item->v_str = memdup (elt->str, elt->len + 1);
item->len = elt->len;
}
item->next = NULL;
item->namelen = namelen;
memset (item->name, 0, namelen);
memcpy (item->name, name, namelen);
return item;
}
/**
* @brief Fetch a KB item or list from a redis Reply.
*
* @param[in] name Name of the item.
* @param[in] rep A redisReply element where to fetch the item.
*
* @return kb_item or list on success, NULL otherwise.
*/
static struct kb_item *
redis2kbitem (const char *name, const redisReply *rep)
{
struct kb_item *kbi;
kbi = NULL;
switch (rep->type)
{
unsigned int i;
case REDIS_REPLY_STRING:
case REDIS_REPLY_INTEGER:
kbi = redis2kbitem_single (name, rep, 0);
break;
case REDIS_REPLY_ARRAY:
for (i = 0; i < rep->elements; i++)
{
struct kb_item *tmpitem;
tmpitem = redis2kbitem_single (name, rep->element[i], 0);
if (tmpitem == NULL)
break;
if (kbi != NULL)
{
tmpitem->next = kbi;
kbi = tmpitem;
}
else
kbi = tmpitem;
}
break;
case REDIS_REPLY_NIL:
case REDIS_REPLY_STATUS:
case REDIS_REPLY_ERROR:
default:
break;
}
return kbi;
}
/**
* @brief Execute a redis command and get a redis reply.
*
* @param[in] kbr Subclass of struct kb to connect to.
* @param[in] fmt Formatted variable argument list with the cmd to be executed.
*
* @return Redis reply on success, NULL otherwise.
*/
static redisReply *
redis_cmd (struct kb_redis *kbr, const char *fmt, ...)
{
redisReply *rep;
va_list ap, aq;
int retry = 0;
va_start (ap, fmt);
do
{
if (get_redis_ctx (kbr) < 0)
{
va_end (ap);
return NULL;
}
va_copy (aq, ap);
rep = redisvCommand (kbr->rctx, fmt, aq);
va_end (aq);
if (kbr->rctx->err)
{
if (rep != NULL)
freeReplyObject (rep);
redis_lnk_reset ((kb_t) kbr);
retry = !retry;
}
else
retry = 0;
}
while (retry);
va_end (ap);
return rep;
}
/**
* @brief Get a single KB element.
*
* @param[in] kb KB handle where to fetch the item.
* @param[in] name Name of the element to retrieve.
* @param[in] type Desired element type.
*
* @return A struct kb_item to be freed with kb_item_free() or NULL if no
* element was found or on error.
*/
static struct kb_item *
redis_get_single (kb_t kb, const char *name, enum kb_item_type type)
{
struct kb_item *kbi;
struct kb_redis *kbr;
redisReply *rep;
kbr = redis_kb (kb);
kbi = NULL;
rep = redis_cmd (kbr, "LINDEX %s -1", name);
if (rep == NULL || rep->type != REDIS_REPLY_STRING)
{
kbi = NULL;
goto out;
}
kbi = redis2kbitem_single (name, rep, type == KB_TYPE_INT);
out:
if (rep != NULL)
freeReplyObject (rep);
return kbi;
}
/**
* @brief Get a single KB string item.
*
* @param[in] kb KB handle where to fetch the item.
* @param[in] name Name of the element to retrieve.
*
* @return A struct kb_item to be freed with kb_item_free() or NULL if no
* element was found or on error.
*/
static char *
redis_get_str (kb_t kb, const char *name)
{
struct kb_item *kbi;
kbi = redis_get_single (kb, name, KB_TYPE_STR);
if (kbi != NULL)
{
char *res;
res = kbi->v_str;
kbi->v_str = NULL;
kb_item_free (kbi);
return res;
}
return NULL;
}
/**
* @brief Push a new entry under a given key.
*
* @param[in] kb KB handle where to store the item.
* @param[in] name Key to push to.
* @param[in] value Value to push.
*
* @return 0 on success, non-null on error.
*/
static int
redis_push_str (kb_t kb, const char *name, const char *value)
{
struct kb_redis *kbr;
redisReply *rep = NULL;
int rc = 0;
if (!value)
return -1;
kbr = redis_kb (kb);
rep = redis_cmd (kbr, "LPUSH %s %s", name, value);
if (!rep || rep->type == REDIS_REPLY_ERROR)
rc = -1;
if (rep)
freeReplyObject (rep);
return rc;
}
/**
* @brief Pops a single KB string item.
*
* @param[in] kb KB handle where to fetch the item.
* @param[in] name Name of the key from where to retrieve.
*
* @return A string to be freed or NULL if list is empty or on error.
*/
static char *
redis_pop_str (kb_t kb, const char *name)
{
struct kb_redis *kbr;
redisReply *rep;
char *value = NULL;
kbr = redis_kb (kb);
rep = redis_cmd (kbr, "RPOP %s", name);
if (!rep)
return NULL;
if (rep->type == REDIS_REPLY_STRING)
value = g_strdup (rep->str);
freeReplyObject (rep);
return value;
}
/**
* @brief Get a single KB integer item.
*
* @param[in] kb KB handle where to fetch the item.
* @param[in] name Name of the element to retrieve.
*
* @return An integer.
*/
static int
redis_get_int (kb_t kb, const char *name)
{
struct kb_item *kbi;
kbi = redis_get_single (kb, name, KB_TYPE_INT);
if (kbi != NULL)
{
int res;
res = kbi->v_int;
kb_item_free (kbi);
return res;
}
return -1;
}
/**
* @brief Get field of a NVT.
*
* @param[in] kb KB handle where to store the nvt.
* @param[in] oid OID of NVT to get from.
* @param[in] position Position of field to get.
*
* @return Value of field, NULL otherwise.
*/
static char *
redis_get_nvt (kb_t kb, const char *oid, enum kb_nvt_pos position)
{
struct kb_redis *kbr;
redisReply *rep;
char *res = NULL;
kbr = redis_kb (kb);
if (position >= NVT_TIMESTAMP_POS)
rep = redis_cmd (kbr, "LINDEX filename:%s %d", oid,
position - NVT_TIMESTAMP_POS);
else
rep = redis_cmd (kbr, "LINDEX nvt:%s %d", oid, position);
if (!rep)
return NULL;
if (rep->type == REDIS_REPLY_INTEGER)
res = g_strdup_printf ("%lld", rep->integer);
else if (rep->type == REDIS_REPLY_STRING)
res = g_strdup (rep->str);
freeReplyObject (rep);
return res;
}
/**
* @brief Get a full NVT.
*
* @param[in] kb KB handle where to store the nvt.
* @param[in] oid OID of NVT to get.
*
* @return nvti_t of NVT, NULL otherwise.
*/
static nvti_t *
redis_get_nvt_all (kb_t kb, const char *oid)
{
struct kb_redis *kbr;
redisReply *rep;
kbr = redis_kb (kb);
rep =
redis_cmd (kbr, "LRANGE nvt:%s %d %d", oid, NVT_FILENAME_POS, NVT_NAME_POS);
if (!rep)
return NULL;
if (rep->type != REDIS_REPLY_ARRAY || rep->elements != NVT_NAME_POS + 1)
{
freeReplyObject (rep);
return NULL;
}
else