Setting srvdst.bev to NULL can be used as a flag to indicate that we
have reused the srvdst of the parent as the dst of the first child conn.
This also prevents access to srvdst.bev after we do the xfer, without
any extra flag.
So that we can replace the SSL/TLS configuration of the conn with the
one in the matching filtering rule. Otherwise, once the server conn is
established, we cannot change the SSL config, or would risk confusing
the SSL routines.
We should defer pass and/or block actions as long as possible, because a
higher precedence rule in SSL filter should be able to override (cancel)
deferred pass and block actions taken by a lower precedence rule in Dst
Host filter. And in HTTP filter the same applies to deferred block
actions taken by Dst Host and SSL filters.
Also, thanks to this new deferred actions, now HTTP filter can keep
enabled divert and split modes. In other words, a higher precedence HTTP
filter rule can cancel a deferred block action set by a lower precedence
rule earlier, which was not possible before without deferred actions and
rule precedence.
And other improvements.
- SSL and Dst Host filters can take all of the actions.
- HTTP filter can only take block action, not divert, split, or pass.
Because, we cannot tear a conn down and reconnect its src, after the
processing of HTTP request header is complete, e.g. SSLproxy line has
already been added to its dst buffer. Also, any change in child conns
would affect listening programs too.
- The precedence of filters is as Dst Host > SSL > HTTP.
- The precedence of actions is as Divert > Split > Pass > Block. This is
only for the same type of filter.
- The precedence of match sites is as sni > cn for ssl filter and host >
uri for http filter.
For example, pass action of dst host filter is taken before split action
of ssl filter, due to the precedence order of filters.
For example, pass action of sni site is taken before split action of cn,
due to the precedence order of sites.
We now create src ssl before enabling src to be able to take divert or
split actions of SSL filter. Otherwise, we wouldn't be able to switch
between divert and split while enabling src, only pass or block action
could be taken at that stage.
Also, refactor and clean up.
Now the site field in PassSite option can have an '*' suffix to search
for a match anywhere in sni or common names. Note that this is not a
regex or wildcard search.
Previously, we only supported exact matches in sni and between slashes
in common names. This change makes it possible to cover multiple sites
in one PassSite option. In fact, without this change, certain sites
could not be added as passsite, because it was impossible to know their
subdomain names beforehand, for example *.fbcdn.net, which may have many
subdomain names in place of asterisk.
So to use substring match, append an '*' to a site name in PassSite
option (the asterisk is removed before substring search). For example,
use ".fbcdn.net*" to match all subdomains of fbcdn.net, notice the
asterisk at the end.
We also add a warning log starting with "Closing on ssl error without
passsite match" to report sites that can be added as passsite, which is
expected to help in writing PassSite rules.
Also, we now set dstaddr_str earlier in conn handling, so we can print
it in debug logs. This also helps in IDLE and EXPIRED conn logs.
We should identify conn user before setting dst up in split mode.
Because in split mode dst setup also sets src up too, which tries to
apply passsite rules and switch to passthrough mode. But since user
identification has not run yet, we don't know the user owner of the
conn, which fails passsite rules.
- Fix segfault introduced in previous commit to prevent extra eof event.
We should NULL srvdst.bev after terminating child dst xferred from
srvdst of parent, so that we don't try to access srvdst.bev. This
happens if child conn with dst xferred from parent srvdst is terminated
before parent conn.
- Fix autossl crash trying to engage passthrough mode. We cannot engage
passthrough mode in autossl, because src is already enabled. But we
shouldn't crash either. These changes are expected to fix other possible
segfaults if passthrough is engaged on eventcb of a child conn.
Otherwise, we cannot classify user if we need to issue identify_user
events, in case database is busy or locked. We should call classify_user
callback right after the user is identified.
So we introduce classify_user callback to achieve that, which fixes the
classify_user behavior for autssl proto too.
Return void in pxy_userauth
Fix typo in clasify
The global opts strings in this new tmp struct are used while cloning
global opts into proxyspec opts. A var of this type is passed around as
a flag to indicate if these opts are global (if non-NULL), so should be
stored in that struct and used as such, or proxyspec specific (if NULL),
so should not be used as global. This var is temporary, hence freed
immediately after configuration is complete.
Also improve and clean up.
This prevents possible multithreading issues between thrmgr and conn
handling threads. So we can remove and clean up the code and comments
related with such possible issues now. For example, we can add the conn
to its thread list earlier, and we can handle errors immediately, thanks
to this early switch to conn handling threads. This also helps achieve
cleaner code.
We don't do anything in srvdst writecb except for passhtrough mode.
We handle srvdst and dst connect tasks in connectcb for them by
arranging connect events correctly, so we don't need any extra flags.
Correct connect ordering helps us remove code checking if bev exists.
There were a lot of unnecessary code in autossl. Tcp and ssl code are
decoupled now.
Create function macros for fine* debug logs
Fix a few memory leaks when DEBUG_PROXY enabled
Add main.mk to MKFS list
Put a few function params within DEBUG_PROXY directives
Check retval of a snprintf() call
Fix segfault with -w/-W options if no ssl proxyspec specified, also fixed in sslsplit develop: https://github.com/droe/sslsplit/issues/271
Various clean-up
Soner Tari