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prop224: Make INTRODUCE2 min/max a consensus param

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Introduction point are rotated either if we get X amounts of INTRODUCE2 cells
on it or a time based expiration. This commit adds two consensus parameters
which are the min and max value bounding the random value X.

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2017-05-09 16:05:28 -04:00 committed by Nick Mathewson
parent feed375f19
commit 670cecaf66
1 changed files with 27 additions and 3 deletions
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30
src/or/hs_service.c
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@ -203,6 +203,30 @@ service_clear_config(hs_service_config_t *config)
memset(config, 0, sizeof(*config));
}
/* Return the number of minimum INTRODUCE2 cell defined by a consensus
* parameter or the default value. */
static int32_t
get_intro_point_min_introduce2(void)
{
/* The [0, 2147483647] range is quite large to accomodate anything we decide
* in the future. */
return networkstatus_get_param(NULL, "hs_intro_min_introduce2",
INTRO_POINT_MIN_LIFETIME_INTRODUCTIONS,
0, INT32_MAX);
}
/* Return the number of maximum INTRODUCE2 cell defined by a consensus
* parameter or the default value. */
static int32_t
get_intro_point_max_introduce2(void)
{
/* The [0, 2147483647] range is quite large to accomodate anything we decide
* in the future. */
return networkstatus_get_param(NULL, "hs_intro_max_introduce2",
INTRO_POINT_MAX_LIFETIME_INTRODUCTIONS,
0, INT32_MAX);
}
/* Helper: Function that needs to return 1 for the HT for each loop which
* frees every service in an hash map. */
static int
@ -274,10 +298,10 @@ service_intro_point_new(const extend_info_t *ei, unsigned int is_legacy)
* term keys. */
ed25519_keypair_generate(&ip->auth_key_kp, 0);
/* XXX: These will be controlled by consensus params. (#20961) */
ip->introduce2_max =
crypto_rand_int_range(INTRO_POINT_MIN_LIFETIME_INTRODUCTIONS,
INTRO_POINT_MAX_LIFETIME_INTRODUCTIONS);
crypto_rand_int_range(get_intro_point_min_introduce2(),
get_intro_point_max_introduce2());
/* XXX: These will be controlled by consensus params. (#20961) */
ip->time_to_expire = time(NULL) +
crypto_rand_int_range(INTRO_POINT_LIFETIME_MIN_SECONDS,
INTRO_POINT_LIFETIME_MAX_SECONDS);