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7385610d0c
- enable in the build (configure) - header parsing - host name lookup - unit tests for the above - CI build - CURL_VERSION_HSTS bit - curl_version_info support - curl -V output - curl-config --features - CURLOPT_HSTS_CTRL - man page for CURLOPT_HSTS_CTRL - curl --hsts (sets CURLOPT_HSTS_CTRL and works with --libcurl) - man page for --hsts - save cache to disk - load cache from disk - CURLOPT_HSTS - man page for CURLOPT_HSTS - added docs/HSTS.md - fixed --version docs - adjusted curl_easy_duphandle Closes #5896
1.4 KiB
1.4 KiB
HSTS support
curl features EXPERIMENTAL support for the Strict-Transport-Security: HTTP header. Added in curl 7.74.0
Standard
HTTP Strict Transport Security
Behavior
libcurl features an in-memory cache for HSTS hosts, so that subsequent HTTP-only requests to a host name present in the cache will get internally "redirected" to the HTTPS version.
curl_easy_setopt() options:
CURLOPT_HSTS_CTRL- enable HSTS for this easy handleCURLOPT_HSTS- specify file name where to store the HSTS cache on close (and possibly read from at startup)
curl cmdline options
--hsts [filename]- enable HSTS, use the file as HSTS cache. If filename is""(no length) then no file will be used, only in-memory cache.
HSTS cache file format
Lines starting with # are ignored.
For each hsts entry:
[host name] "YYYYMMDD HH:MM:SS"
The [host name] is dot-prefixed if it is a includeSubDomain.
The time stamp is when the entry expires.
I considered using wget's file format for the HSTS cache. However, they store the time stamp as the epoch (number of seconds since 1970) and I strongly disagree with using that format. Instead I opted to use a format similar to the curl alt-svc cache file format.
Possible future additions
CURLOPT_HSTS_PRELOAD- provide a set of preloaded HSTS host names- ability to save to something else than a file