2 @documentencoding UTF-8
6 Copyright @copyright{} 2021 @email{stargrave@@stargrave.org, Sergey Matveev}
12 @image{logs,,,Example logs,.webp}
16 @item I am tired that various HTTPS clients (like browsers and feed
17 aggregators) use various TLS libraries with different features. NSS,
18 GnuTLS, OpenSSL... All of them sucks, comparing to Go's @code{crypto/tls}.
20 @item I tired that everyone provides very limited certificates trust
21 management capabilities, like either certificate or SPKI
22 @url{https://en.wikipedia.org/wiki/Certificate_pinning, pinning} with
23 @url{https://en.wikipedia.org/wiki/Trust_on_first_use, TOFU}. Even my
24 beloved @url{https://en.wikipedia.org/wiki/Xombrero, Xombrero} browser
25 still pins only the whole certificate, but its public key would be much
26 more sufficient and convenient to work with.
28 @item I am tired that many clients provides very few information about
29 certificates and connections at all.
31 @item I hate that hardly anyone can control (no automatic silent
32 transparent following) HTTP redirections. Although Firefox had proper
35 @item I am sick of tiny control on URLs. The best you can is to use some
36 kind of @url{https://en.wikipedia.org/wiki/Privoxy, Privoxy}, but it is
37 not friendly with TLS connections, obviously.
39 @item Hardly anyone does
40 @url{https://en.wikipedia.org/wiki/DNS-based_Authentication_of_Named_Entities, DANE}
43 @item And there is insanity of downloading fonts.
44 Why the hell people just do not send PostScript documents instead!?
46 @item And wonderful @url{http://jpegxl.info/, JPEG XL} image format is
47 not supported by most browsers. Even pretty old WebP is not supported
52 That is why I wrote @command{tofuproxy} -- pure Go HTTP proxy, MitMing
53 all HTTPS connections on the fly. It is written for my personal needs
54 exclusively, so many features are just directly hard-coded, instead of
55 creating some kind of complex configuration framework.
59 @item Effective responses proxying, without storing them in the memory first.
61 @item TLS connection between client and @command{tofuproxy} has the
62 proper hostname set in ephemeral on-the-fly generated certificate.
64 @item @code{HEAD} method is forbidden, because of damned Xombrero loving
65 making it so much. Can live without it.
67 @item @code{www.reddit.com} is redirected to @code{old.reddit.com}.
69 @item Various spying domains (advertisement, tracking counters) are
70 responded with 404 error.
72 @item Web fonts downloads are replaced with 404 errors.
74 @item All HTTP redirects are replaced with HTML page with the link.
75 However temporary redirects are passed as is for @code{newsboat}
78 @item WebP (except if User-Agent is Xombrero browser) and JPEG XL images
79 are transparently transcoded to PNG.
81 @item Default Go's checks are applied to all certificates. If they pass,
82 then certificate chain is saved on the disk. Future connections are
83 compared against it, warning you about SPKI change and waiting for
84 your decision either to accept new chain (possibly once per
85 session), or reject it.
87 @item Even when native Go's checks are failed, you can still make a
88 decision to forcefully trust the domain.
90 @item Optionally DANE-EE check is also made for each domain you visit.
92 @item TLS session resumption is also supported.
96 @image{dialog,,,Example dialog,.webp}
103 @item Build @command{tofuproxy}:
106 $ git clone git://git.stargrave.org/tofuproxy.git
112 Generate CA-capable certificate for the proxy, that will issue ephemeral
113 certificate to proxied domains:
120 Create directory with output FIFOs and directory for stored certificate chains:
128 Run @command{tofuproxy} itself. By default it will bind to
129 @code{[::1]:8080}, use @code{[::1]:53} DNS server for DANE requests
130 (set to an empty string to disable DANE lookups):
134 main.go:316: listening: [::1]:8080
137 @item Trust your newly generated CA:
140 # cat /path/to/tofuproxy/cert.pem >> /etc/ssl/cert.pem
143 @item Point you HTTP/HTTPS clients to @code{http://localhost:8080}.
145 @item Watch logs with @url{https://github.com/halturin/multitail, multitail}:
153 When you encounter something requiring your attention and decision, you
154 will be shown Tk-dialog through the @command{wish} invocation. GnuTLS'es
155 @command{certtool} is used for certificate information printing.
160 What I am planning possibly to do? Just brainstorming:
164 @item HTTP authorization dialog.
166 @item TLS client certificates usage capability.