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hs_pow: fix insufficient length check in pow-params

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The descriptor validation table had an out of date minimum length
for pow-params (3) whereas the spec and the current code expect at
least 4 parameters. This was an opportunity for a malicious service
to cause an assert failure in clients which attempted to parse its
descriptor.

Addresses issue #40793

Signed-off-by: Micah Elizabeth Scott <beth@torproject.org>
This commit is contained in:
Micah Elizabeth Scott 2023-05-15 12:11:00 -07:00
parent 34da50718a
commit 459b775a7e
1 changed files with 1 additions and 1 deletions
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2
src/feature/hs/hs_descriptor.c
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@ -155,7 +155,7 @@ static token_rule_t hs_desc_encrypted_v3_token_table[] = {
T01(str_intro_auth_required, R3_INTRO_AUTH_REQUIRED, GE(1), NO_OBJ),
T01(str_single_onion, R3_SINGLE_ONION_SERVICE, ARGS, NO_OBJ),
T01(str_flow_control, R3_FLOW_CONTROL, GE(2), NO_OBJ),
T01(str_pow_params, R3_POW_PARAMS, GE(3), NO_OBJ),
T01(str_pow_params, R3_POW_PARAMS, GE(4), NO_OBJ),
END_OF_TABLE
};