mirror of
https://github.com/moparisthebest/curl
synced 2024-11-18 07:25:14 -05:00
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
45 lines
1.4 KiB
Markdown
45 lines
1.4 KiB
Markdown
# HSTS support
|
|
|
|
curl features **EXPERIMENTAL** support for the Strict-Transport-Security: HTTP
|
|
header. Added in curl 7.74.0
|
|
|
|
## Standard
|
|
|
|
[HTTP Strict Transport Security](https://tools.ietf.org/html/rfc6797)
|
|
|
|
## 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 handle
|
|
- `CURLOPT_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
|