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In order to protect from a malicious DNS client that sends many queries with a SIG(0)-signed message, add a quota of simultaneously running SIG(0) checks. This protection can only help when named is using more than one worker threads. For example, if named is running with the '-n 4' option, and 'sig0checks-quota 2;' is used, then named will make sure to not use more than 2 workers for the SIG(0) signature checks in parallel, thus leaving the other workers to serve the remaining clients which do not use SIG(0)-signed messages. That limitation is going to change when SIG(0) signature checks are offloaded to "slow" threads in a future commit. The 'sig0checks-quota-exempt' ACL option can be used to exempt certain clients from the quota requirements using their IP or network addresses. The 'sig0checks-quota-maxwait-ms' option is used to define a maximum amount of time for named to wait for a quota to appear. If during that time no new quota becomes available, named will answer to the client with DNS_R_REFUSED. |
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| .. | ||
| include | ||
| .gitignore | ||
| client.c | ||
| hooks.c | ||
| interfacemgr.c | ||
| listenlist.c | ||
| log.c | ||
| Makefile.am | ||
| notify.c | ||
| probes.d | ||
| query.c | ||
| server.c | ||
| sortlist.c | ||
| stats.c | ||
| tests | ||
| update.c | ||
| xfrout.c | ||